Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

47 files changed, 13418 insertions, 0 deletions

diff --git a/arch/i386/math-emu/Makefile b/arch/i386/math-emu/Makefile
new file mode 100644
index 000000000000..9c943fa6ce6b
--- /dev/null
+++ b/arch/i386/math-emu/Makefile
@@ -0,0 +1,30 @@
+#
+#               Makefile for wm-FPU-emu
+#
+
+#DEBUG  = -DDEBUGGING
+DEBUG   =
+PARANOID = -DPARANOID
+CFLAGS  := $(CFLAGS) $(PARANOID) $(DEBUG) -fno-builtin $(MATH_EMULATION)
+
+EXTRA_AFLAGS    := $(PARANOID)
+
+# From 'C' language sources:
+C_OBJS =fpu_entry.o errors.o \
+        fpu_arith.o fpu_aux.o fpu_etc.o fpu_tags.o fpu_trig.o \
+        load_store.o get_address.o \
+        poly_atan.o poly_l2.o poly_2xm1.o poly_sin.o poly_tan.o \
+        reg_add_sub.o reg_compare.o reg_constant.o reg_convert.o \
+        reg_ld_str.o reg_divide.o reg_mul.o
+
+# From 80x86 assembler sources:
+A_OBJS =reg_u_add.o reg_u_div.o reg_u_mul.o reg_u_sub.o \
+        div_small.o reg_norm.o reg_round.o \
+        wm_shrx.o wm_sqrt.o \
+        div_Xsig.o polynom_Xsig.o round_Xsig.o \
+        shr_Xsig.o mul_Xsig.o
+
+obj-y =$(C_OBJS) $(A_OBJS)
+
+proto:
+        cproto -e -DMAKING_PROTO *.c >fpu_proto.h
diff --git a/arch/i386/math-emu/README b/arch/i386/math-emu/README
new file mode 100644
index 000000000000..e6235491d6eb
--- /dev/null
+++ b/arch/i386/math-emu/README
@@ -0,0 +1,427 @@
+ +---------------------------------------------------------------------------+
+ |  wm-FPU-emu   an FPU emulator for 80386 and 80486SX microprocessors.      |
+ |                                                                           |
+ | Copyright (C) 1992,1993,1994,1995,1996,1997,1999                          |
+ |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
+ |                       Australia.  E-mail billm@melbpc.org.au              |
+ |                                                                           |
+ |    This program is free software; you can redistribute it and/or modify   |
+ |    it under the terms of the GNU General Public License version 2 as      |
+ |    published by the Free Software Foundation.                             |
+ |                                                                           |
+ |    This program is distributed in the hope that it will be useful,        |
+ |    but WITHOUT ANY WARRANTY; without even the implied warranty of         |
+ |    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          |
+ |    GNU General Public License for more details.                           |
+ |                                                                           |
+ |    You should have received a copy of the GNU General Public License      |
+ |    along with this program; if not, write to the Free Software            |
+ |    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.              |
+ |                                                                           |
+ +---------------------------------------------------------------------------+
+
+
+
+wm-FPU-emu is an FPU emulator for Linux. It is derived from wm-emu387
+which was my 80387 emulator for early versions of djgpp (gcc under
+msdos); wm-emu387 was in turn based upon emu387 which was written by
+DJ Delorie for djgpp.  The interface to the Linux kernel is based upon
+the original Linux math emulator by Linus Torvalds.
+
+My target FPU for wm-FPU-emu is that described in the Intel486
+Programmer's Reference Manual (1992 edition). Unfortunately, numerous
+facets of the functioning of the FPU are not well covered in the
+Reference Manual. The information in the manual has been supplemented
+with measurements on real 80486's. Unfortunately, it is simply not
+possible to be sure that all of the peculiarities of the 80486 have
+been discovered, so there is always likely to be obscure differences
+in the detailed behaviour of the emulator and a real 80486.
+
+wm-FPU-emu does not implement all of the behaviour of the 80486 FPU,
+but is very close.  See "Limitations" later in this file for a list of
+some differences.
+
+Please report bugs, etc to me at:
+       billm@melbpc.org.au
+or     b.metzenthen@medoto.unimelb.edu.au
+
+For more information on the emulator and on floating point topics, see
+my web pages, currently at  http://www.suburbia.net/~billm/
+
+
+--Bill Metzenthen
+  December 1999
+
+
+----------------------- Internals of wm-FPU-emu -----------------------
+
+Numeric algorithms:
+(1) Add, subtract, and multiply. Nothing remarkable in these.
+(2) Divide has been tuned to get reasonable performance. The algorithm
+    is not the obvious one which most people seem to use, but is designed
+    to take advantage of the characteristics of the 80386. I expect that
+    it has been invented many times before I discovered it, but I have not
+    seen it. It is based upon one of those ideas which one carries around
+    for years without ever bothering to check it out.
+(3) The sqrt function has been tuned to get good performance. It is based
+    upon Newton's classic method. Performance was improved by capitalizing
+    upon the properties of Newton's method, and the code is once again
+    structured taking account of the 80386 characteristics.
+(4) The trig, log, and exp functions are based in each case upon quasi-
+    "optimal" polynomial approximations. My definition of "optimal" was
+    based upon getting good accuracy with reasonable speed.
+(5) The argument reducing code for the trig function effectively uses
+    a value of pi which is accurate to more than 128 bits. As a consequence,
+    the reduced argument is accurate to more than 64 bits for arguments up
+    to a few pi, and accurate to more than 64 bits for most arguments,
+    even for arguments approaching 2^63. This is far superior to an
+    80486, which uses a value of pi which is accurate to 66 bits.
+
+The code of the emulator is complicated slightly by the need to
+account for a limited form of re-entrancy. Normally, the emulator will
+emulate each FPU instruction to completion without interruption.
+However, it may happen that when the emulator is accessing the user
+memory space, swapping may be needed. In this case the emulator may be
+temporarily suspended while disk i/o takes place. During this time
+another process may use the emulator, thereby perhaps changing static
+variables. The code which accesses user memory is confined to five
+files:
+    fpu_entry.c
+    reg_ld_str.c
+    load_store.c
+    get_address.c
+    errors.c
+As from version 1.12 of the emulator, no static variables are used
+(apart from those in the kernel's per-process tables). The emulator is
+therefore now fully re-entrant, rather than having just the restricted
+form of re-entrancy which is required by the Linux kernel.
+
+----------------------- Limitations of wm-FPU-emu -----------------------
+
+There are a number of differences between the current wm-FPU-emu
+(version 2.01) and the 80486 FPU (apart from bugs).  The differences
+are fewer than those which applied to the 1.xx series of the emulator.
+Some of the more important differences are listed below:
+
+The Roundup flag does not have much meaning for the transcendental
+functions and its 80486 value with these functions is likely to differ
+from its emulator value.
+
+In a few rare cases the Underflow flag obtained with the emulator will
+be different from that obtained with an 80486. This occurs when the
+following conditions apply simultaneously:
+(a) the operands have a higher precision than the current setting of the
+    precision control (PC) flags.
+(b) the underflow exception is masked.
+(c) the magnitude of the exact result (before rounding) is less than 2^-16382.
+(d) the magnitude of the final result (after rounding) is exactly 2^-16382.
+(e) the magnitude of the exact result would be exactly 2^-16382 if the
+    operands were rounded to the current precision before the arithmetic
+    operation was performed.
+If all of these apply, the emulator will set the Underflow flag but a real
+80486 will not.
+
+NOTE: Certain formats of Extended Real are UNSUPPORTED. They are
+unsupported by the 80486. They are the Pseudo-NaNs, Pseudoinfinities,
+and Unnormals. None of these will be generated by an 80486 or by the
+emulator. Do not use them. The emulator treats them differently in
+detail from the way an 80486 does.
+
+Self modifying code can cause the emulator to fail. An example of such
+code is:
+          movl %esp,[%ebx]
+          fld1
+The FPU instruction may be (usually will be) loaded into the pre-fetch
+queue of the CPU before the mov instruction is executed. If the
+destination of the 'movl' overlaps the FPU instruction then the bytes
+in the prefetch queue and memory will be inconsistent when the FPU
+instruction is executed. The emulator will be invoked but will not be
+able to find the instruction which caused the device-not-present
+exception. For this case, the emulator cannot emulate the behaviour of
+an 80486DX.
+
+Handling of the address size override prefix byte (0x67) has not been
+extensively tested yet. A major problem exists because using it in
+vm86 mode can cause a general protection fault. Address offsets
+greater than 0xffff appear to be illegal in vm86 mode but are quite
+acceptable (and work) in real mode. A small test program developed to
+check the addressing, and which runs successfully in real mode,
+crashes dosemu under Linux and also brings Windows down with a general
+protection fault message when run under the MS-DOS prompt of Windows
+3.1. (The program simply reads data from a valid address).
+
+The emulator supports 16-bit protected mode, with one difference from
+an 80486DX.  A 80486DX will allow some floating point instructions to
+write a few bytes below the lowest address of the stack.  The emulator
+will not allow this in 16-bit protected mode: no instructions are
+allowed to write outside the bounds set by the protection.
+
+----------------------- Performance of wm-FPU-emu -----------------------
+
+Speed.
+-----
+
+The speed of floating point computation with the emulator will depend
+upon instruction mix. Relative performance is best for the instructions
+which require most computation. The simple instructions are adversely
+affected by the FPU instruction trap overhead.
+
+
+Timing: Some simple timing tests have been made on the emulator functions.
+The times include load/store instructions. All times are in microseconds
+measured on a 33MHz 386 with 64k cache. The Turbo C tests were under
+ms-dos, the next two columns are for emulators running with the djgpp
+ms-dos extender. The final column is for wm-FPU-emu in Linux 0.97,
+using libm4.0 (hard).
+
+function      Turbo C        djgpp 1.06        WM-emu387     wm-FPU-emu
+
+   +          60.5           154.8              76.5          139.4
+   -          61.1-65.5      157.3-160.8        76.2-79.5     142.9-144.7
+   *          71.0           190.8              79.6          146.6
+   /          61.2-75.0      261.4-266.9        75.3-91.6     142.2-158.1
+
+ sin()        310.8          4692.0            319.0          398.5
+ cos()        284.4          4855.2            308.0          388.7
+ tan()        495.0          8807.1            394.9          504.7
+ atan()       328.9          4866.4            601.1          419.5-491.9
+
+ sqrt()       128.7          crashed           145.2          227.0
+ log()        413.1-419.1    5103.4-5354.21    254.7-282.2    409.4-437.1
+ exp()        479.1          6619.2            469.1          850.8
+
+
+The performance under Linux is improved by the use of look-ahead code.
+The following results show the improvement which is obtained under
+Linux due to the look-ahead code. Also given are the times for the
+original Linux emulator with the 4.1 'soft' lib.
+
+ [ Linus' note: I changed look-ahead to be the default under linux, as
+   there was no reason not to use it after I had edited it to be
+   disabled during tracing ]
+
+            wm-FPU-emu w     original w
+            look-ahead       'soft' lib
+   +         106.4             190.2
+   -         108.6-111.6      192.4-216.2
+   *         113.4             193.1
+   /         108.8-124.4      700.1-706.2
+
+ sin()       390.5            2642.0
+ cos()       381.5            2767.4
+ tan()       496.5            3153.3
+ atan()      367.2-435.5     2439.4-3396.8
+
+ sqrt()      195.1            4732.5
+ log()       358.0-387.5     3359.2-3390.3
+ exp()       619.3            4046.4
+
+
+These figures are now somewhat out-of-date. The emulator has become
+progressively slower for most functions as more of the 80486 features
+have been implemented.
+
+
+----------------------- Accuracy of wm-FPU-emu -----------------------
+
+
+The accuracy of the emulator is in almost all cases equal to or better
+than that of an Intel 80486 FPU.
+
+The results of the basic arithmetic functions (+,-,*,/), and fsqrt
+match those of an 80486 FPU. They are the best possible; the error for
+these never exceeds 1/2 an lsb. The fprem and fprem1 instructions
+return exact results; they have no error.
+
+
+The following table compares the emulator accuracy for the sqrt(),
+trig and log functions against the Turbo C "emulator". For this table,
+each function was tested at about 400 points. Ideal worst-case results
+would be 64 bits. The reduced Turbo C accuracy of cos() and tan() for
+arguments greater than pi/4 can be thought of as being related to the
+precision of the argument x; e.g. an argument of pi/2-(1e-10) which is
+accurate to 64 bits can result in a relative accuracy in cos() of
+about 64 + log2(cos(x)) = 31 bits.
+
+
+Function      Tested x range            Worst result                Turbo C
+                                        (relative bits)
+
+sqrt(x)       1 .. 2                    64.1                         63.2
+atan(x)       1e-10 .. 200              64.2                         62.8
+cos(x)        0 .. pi/2-(1e-10)         64.4 (x <= pi/4)             62.4
+                                        64.1 (x = pi/2-(1e-10))      31.9
+sin(x)        1e-10 .. pi/2             64.0                         62.8
+tan(x)        1e-10 .. pi/2-(1e-10)     64.0 (x <= pi/4)             62.1
+                                        64.1 (x = pi/2-(1e-10))      31.9
+exp(x)        0 .. 1                    63.1 **                      62.9
+log(x)        1+1e-6 .. 2               63.8 **                      62.1
+
+** The accuracy for exp() and log() is low because the FPU (emulator)
+does not compute them directly; two operations are required.
+
+
+The emulator passes the "paranoia" tests (compiled with gcc 2.3.3 or
+later) for 'float' variables (24 bit precision numbers) when precision
+control is set to 24, 53 or 64 bits, and for 'double' variables (53
+bit precision numbers) when precision control is set to 53 bits (a
+properly performing FPU cannot pass the 'paranoia' tests for 'double'
+variables when precision control is set to 64 bits).
+
+The code for reducing the argument for the trig functions (fsin, fcos,
+fptan and fsincos) has been improved and now effectively uses a value
+for pi which is accurate to more than 128 bits precision. As a
+consequence, the accuracy of these functions for large arguments has
+been dramatically improved (and is now very much better than an 80486
+FPU). There is also now no degradation of accuracy for fcos and fptan
+for operands close to pi/2. Measured results are (note that the
+definition of accuracy has changed slightly from that used for the
+above table):
+
+Function      Tested x range          Worst result
+                                     (absolute bits)
+
+cos(x)        0 .. 9.22e+18              62.0
+sin(x)        1e-16 .. 9.22e+18          62.1
+tan(x)        1e-16 .. 9.22e+18          61.8
+
+It is possible with some effort to find very large arguments which
+give much degraded precision. For example, the integer number
+           8227740058411162616.0
+is within about 10e-7 of a multiple of pi. To find the tan (for
+example) of this number to 64 bits precision it would be necessary to
+have a value of pi which had about 150 bits precision. The FPU
+emulator computes the result to about 42.6 bits precision (the correct
+result is about -9.739715e-8). On the other hand, an 80486 FPU returns
+0.01059, which in relative terms is hopelessly inaccurate.
+
+For arguments close to critical angles (which occur at multiples of
+pi/2) the emulator is more accurate than an 80486 FPU. For very large
+arguments, the emulator is far more accurate.
+
+
+Prior to version 1.20 of the emulator, the accuracy of the results for
+the transcendental functions (in their principal range) was not as
+good as the results from an 80486 FPU. From version 1.20, the accuracy
+has been considerably improved and these functions now give measured
+worst-case results which are better than the worst-case results given
+by an 80486 FPU.
+
+The following table gives the measured results for the emulator. The
+number of randomly selected arguments in each case is about half a
+million.  The group of three columns gives the frequency of the given
+accuracy in number of times per million, thus the second of these
+columns shows that an accuracy of between 63.80 and 63.89 bits was
+found at a rate of 133 times per one million measurements for fsin.
+The results show that the fsin, fcos and fptan instructions return
+results which are in error (i.e. less accurate than the best possible
+result (which is 64 bits)) for about one per cent of all arguments
+between -pi/2 and +pi/2.  The other instructions have a lower
+frequency of results which are in error.  The last two columns give
+the worst accuracy which was found (in bits) and the approximate value
+of the argument which produced it.
+
+                                frequency (per M)
+                               -------------------   ---------------
+instr   arg range    # tests   63.7   63.8    63.9   worst   at arg
+                               bits   bits    bits    bits
+-----  ------------  -------   ----   ----   -----   -----  --------
+fsin     (0,pi/2)     547756      0    133   10673   63.89  0.451317
+fcos     (0,pi/2)     547563      0    126   10532   63.85  0.700801
+fptan    (0,pi/2)     536274     11    267   10059   63.74  0.784876
+fpatan  4 quadrants   517087      0      8    1855   63.88  0.435121 (4q)
+fyl2x     (0,20)      541861      0      0    1323   63.94  1.40923  (x)
+fyl2xp1 (-.293,.414)  520256      0      0    5678   63.93  0.408542 (x)
+f2xm1     (-1,1)      538847      4    481    6488   63.79  0.167709
+
+
+Tests performed on an 80486 FPU showed results of lower accuracy. The
+following table gives the results which were obtained with an AMD
+486DX2/66 (other tests indicate that an Intel 486DX produces
+identical results).  The tests were basically the same as those used
+to measure the emulator (the values, being random, were in general not
+the same).  The total number of tests for each instruction are given
+at the end of the table, in case each about 100k tests were performed.
+Another line of figures at the end of the table shows that most of the
+instructions return results which are in error for more than 10
+percent of the arguments tested.
+
+The numbers in the body of the table give the approx number of times a
+result of the given accuracy in bits (given in the left-most column)
+was obtained per one million arguments. For three of the instructions,
+two columns of results are given: * The second column for f2xm1 gives
+the number cases where the results of the first column were for a
+positive argument, this shows that this instruction gives better
+results for positive arguments than it does for negative.  * In the
+cases of fcos and fptan, the first column gives the results when all
+cases where arguments greater than 1.5 were removed from the results
+given in the second column. Unlike the emulator, an 80486 FPU returns
+results of relatively poor accuracy for these instructions when the
+argument approaches pi/2. The table does not show those cases when the
+accuracy of the results were less than 62 bits, which occurs quite
+often for fsin and fptan when the argument approaches pi/2. This poor
+accuracy is discussed above in relation to the Turbo C "emulator", and
+the accuracy of the value of pi.
+
+
+bits   f2xm1  f2xm1 fpatan   fcos   fcos  fyl2x fyl2xp1  fsin  fptan  fptan
+62.0       0      0      0      0    437      0      0      0      0    925
+62.1       0      0     10      0    894      0      0      0      0   1023
+62.2      14      0      0      0   1033      0      0      0      0    945
+62.3      57      0      0      0   1202      0      0      0      0   1023
+62.4     385      0      0     10   1292      0     23      0      0   1178
+62.5    1140      0      0    119   1649      0     39      0      0   1149
+62.6    2037      0      0    189   1620      0     16      0      0   1169
+62.7    5086     14      0    646   2315     10    101     35     39   1402
+62.8    8818     86      0    984   3050     59    287    131    224   2036
+62.9   11340   1355      0   2126   4153     79    605    357    321   1948
+63.0   15557   4750      0   3319   5376    246   1281    862    808   2688
+63.1   20016   8288      0   4620   6628    511   2569   1723   1510   3302
+63.2   24945  11127     10   6588   8098   1120   4470   2968   2990   4724
+63.3   25686  12382     69   8774  10682   1906   6775   4482   5474   7236
+63.4   29219  14722     79  11109  12311   3094   9414   7259   8912  10587
+63.5   30458  14936    393  13802  15014   5874  12666   9609  13762  15262
+63.6   32439  16448   1277  17945  19028  10226  15537  14657  19158  20346
+63.7   35031  16805   4067  23003  23947  18910  20116  21333  25001  26209
+63.8   33251  15820   7673  24781  25675  24617  25354  24440  29433  30329
+63.9   33293  16833  18529  28318  29233  31267  31470  27748  29676  30601
+
+Per cent with error:
+        30.9           3.2          18.5    9.8   13.1   11.6          17.4
+Total arguments tested:
+       70194  70099 101784 100641 100641 101799 128853 114893 102675 102675
+
+
+------------------------- Contributors -------------------------------
+
+A number of people have contributed to the development of the
+emulator, often by just reporting bugs, sometimes with suggested
+fixes, and a few kind people have provided me with access in one way
+or another to an 80486 machine. Contributors include (to those people
+who I may have forgotten, please forgive me):
+
+Linus Torvalds
+Tommy.Thorn@daimi.aau.dk
+Andrew.Tridgell@anu.edu.au
+Nick Holloway, alfie@dcs.warwick.ac.uk
+Hermano Moura, moura@dcs.gla.ac.uk
+Jon Jagger, J.Jagger@scp.ac.uk
+Lennart Benschop
+Brian Gallew, geek+@CMU.EDU
+Thomas Staniszewski, ts3v+@andrew.cmu.edu
+Martin Howell, mph@plasma.apana.org.au
+M Saggaf, alsaggaf@athena.mit.edu
+Peter Barker, PETER@socpsy.sci.fau.edu
+tom@vlsivie.tuwien.ac.at
+Dan Russel, russed@rpi.edu
+Daniel Carosone, danielce@ee.mu.oz.au
+cae@jpmorgan.com
+Hamish Coleman, t933093@minyos.xx.rmit.oz.au
+Bruce Evans, bde@kralizec.zeta.org.au
+Timo Korvola, Timo.Korvola@hut.fi
+Rick Lyons, rick@razorback.brisnet.org.au
+Rick, jrs@world.std.com
+ 
+...and numerous others who responded to my request for help with
+a real 80486.
+
diff --git a/arch/i386/math-emu/control_w.h b/arch/i386/math-emu/control_w.h
new file mode 100644
index 000000000000..ae2274dbd305
--- /dev/null
+++ b/arch/i386/math-emu/control_w.h
@@ -0,0 +1,45 @@
+/*---------------------------------------------------------------------------+
+ |  control_w.h                                                              |
+ |                                                                           |
+ | Copyright (C) 1992,1993                                                   |
+ |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
+ |                       Australia.  E-mail   billm@vaxc.cc.monash.edu.au    |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+#ifndef _CONTROLW_H_
+#define _CONTROLW_H_
+
+#ifdef __ASSEMBLY__
+#define _Const_(x)      $##x
+#else
+#define _Const_(x)      x
+#endif
+
+#define CW_RC           _Const_(0x0C00) /* rounding control */
+#define CW_PC           _Const_(0x0300) /* precision control */
+
+#define CW_Precision    Const_(0x0020)  /* loss of precision mask */
+#define CW_Underflow    Const_(0x0010)  /* underflow mask */
+#define CW_Overflow     Const_(0x0008)  /* overflow mask */
+#define CW_ZeroDiv      Const_(0x0004)  /* divide by zero mask */
+#define CW_Denormal     Const_(0x0002)  /* denormalized operand mask */
+#define CW_Invalid      Const_(0x0001)  /* invalid operation mask */
+
+#define CW_Exceptions   _Const_(0x003f) /* all masks */
+
+#define RC_RND          _Const_(0x0000)
+#define RC_DOWN         _Const_(0x0400)
+#define RC_UP           _Const_(0x0800)
+#define RC_CHOP         _Const_(0x0C00)
+
+/* p 15-5: Precision control bits affect only the following:
+   ADD, SUB(R), MUL, DIV(R), and SQRT */
+#define PR_24_BITS        _Const_(0x000)
+#define PR_53_BITS        _Const_(0x200)
+#define PR_64_BITS        _Const_(0x300)
+#define PR_RESERVED_BITS  _Const_(0x100)
+/* FULL_PRECISION simulates all exceptions masked */
+#define FULL_PRECISION  (PR_64_BITS | RC_RND | 0x3f)
+
+#endif /* _CONTROLW_H_ */
diff --git a/arch/i386/math-emu/div_Xsig.S b/arch/i386/math-emu/div_Xsig.S
new file mode 100644
index 000000000000..f77ba3058b31
--- /dev/null
+++ b/arch/i386/math-emu/div_Xsig.S
@@ -0,0 +1,365 @@
+        .file   "div_Xsig.S"
+/*---------------------------------------------------------------------------+
+ |  div_Xsig.S                                                               |
+ |                                                                           |
+ | Division subroutine for 96 bit quantities                                 |
+ |                                                                           |
+ | Copyright (C) 1994,1995                                                   |
+ |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
+ |                       Australia.  E-mail billm@jacobi.maths.monash.edu.au |
+ |                                                                           |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------+
+ | Divide the 96 bit quantity pointed to by a, by that pointed to by b, and  |
+ | put the 96 bit result at the location d.                                  |
+ |                                                                           |
+ | The result may not be accurate to 96 bits. It is intended for use where   |
+ | a result better than 64 bits is required. The result should usually be    |
+ | good to at least 94 bits.                                                 |
+ | The returned result is actually divided by one half. This is done to      |
+ | prevent overflow.                                                         |
+ |                                                                           |
+ |  .aaaaaaaaaaaaaa / .bbbbbbbbbbbbb  ->  .dddddddddddd                      |
+ |                                                                           |
+ |  void div_Xsig(Xsig *a, Xsig *b, Xsig *dest)                              |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+#include "exception.h"
+#include "fpu_emu.h"
+
+
+#define XsigLL(x)       (x)
+#define XsigL(x)        4(x)
+#define XsigH(x)        8(x)
+
+
+#ifndef NON_REENTRANT_FPU
+/*
+        Local storage on the stack:
+        Accumulator:    FPU_accum_3:FPU_accum_2:FPU_accum_1:FPU_accum_0
+ */
+#define FPU_accum_3     -4(%ebp)
+#define FPU_accum_2     -8(%ebp)
+#define FPU_accum_1     -12(%ebp)
+#define FPU_accum_0     -16(%ebp)
+#define FPU_result_3    -20(%ebp)
+#define FPU_result_2    -24(%ebp)
+#define FPU_result_1    -28(%ebp)
+
+#else
+.data
+/*
+        Local storage in a static area:
+        Accumulator:    FPU_accum_3:FPU_accum_2:FPU_accum_1:FPU_accum_0
+ */
+        .align 4,0
+FPU_accum_3:
+        .long   0
+FPU_accum_2:
+        .long   0
+FPU_accum_1:
+        .long   0
+FPU_accum_0:
+        .long   0
+FPU_result_3:
+        .long   0
+FPU_result_2:
+        .long   0
+FPU_result_1:
+        .long   0
+#endif /* NON_REENTRANT_FPU */
+
+
+.text
+ENTRY(div_Xsig)
+        pushl   %ebp
+        movl    %esp,%ebp
+#ifndef NON_REENTRANT_FPU
+        subl    $28,%esp
+#endif /* NON_REENTRANT_FPU */ 
+
+        pushl   %esi
+        pushl   %edi
+        pushl   %ebx
+
+        movl    PARAM1,%esi     /* pointer to num */
+        movl    PARAM2,%ebx     /* pointer to denom */
+
+#ifdef PARANOID
+        testl   $0x80000000, XsigH(%ebx)        /* Divisor */
+        je      L_bugged
+#endif /* PARANOID */
+
+
+/*---------------------------------------------------------------------------+
+ |  Divide:   Return  arg1/arg2 to arg3.                                     |
+ |                                                                           |
+ |  The maximum returned value is (ignoring exponents)                       |
+ |               .ffffffff ffffffff                                          |
+ |               ------------------  =  1.ffffffff fffffffe                  |
+ |               .80000000 00000000                                          |
+ | and the minimum is                                                        |
+ |               .80000000 00000000                                          |
+ |               ------------------  =  .80000000 00000001   (rounded)       |
+ |               .ffffffff ffffffff                                          |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+        /* Save extended dividend in local register */
+
+        /* Divide by 2 to prevent overflow */
+        clc
+        movl    XsigH(%esi),%eax
+        rcrl    %eax
+        movl    %eax,FPU_accum_3
+        movl    XsigL(%esi),%eax
+        rcrl    %eax
+        movl    %eax,FPU_accum_2
+        movl    XsigLL(%esi),%eax
+        rcrl    %eax
+        movl    %eax,FPU_accum_1
+        movl    $0,%eax
+        rcrl    %eax
+        movl    %eax,FPU_accum_0
+
+        movl    FPU_accum_2,%eax        /* Get the current num */
+        movl    FPU_accum_3,%edx
+
+/*----------------------------------------------------------------------*/
+/* Initialization done.
+   Do the first 32 bits. */
+
+        /* We will divide by a number which is too large */
+        movl    XsigH(%ebx),%ecx
+        addl    $1,%ecx
+        jnc     LFirst_div_not_1
+
+        /* here we need to divide by 100000000h,
+           i.e., no division at all.. */
+        mov     %edx,%eax
+        jmp     LFirst_div_done
+
+LFirst_div_not_1:
+        divl    %ecx            /* Divide the numerator by the augmented
+                                   denom ms dw */
+
+LFirst_div_done:
+        movl    %eax,FPU_result_3       /* Put the result in the answer */
+
+        mull    XsigH(%ebx)     /* mul by the ms dw of the denom */
+
+        subl    %eax,FPU_accum_2        /* Subtract from the num local reg */
+        sbbl    %edx,FPU_accum_3
+
+        movl    FPU_result_3,%eax       /* Get the result back */
+        mull    XsigL(%ebx)     /* now mul the ls dw of the denom */
+
+        subl    %eax,FPU_accum_1        /* Subtract from the num local reg */
+        sbbl    %edx,FPU_accum_2
+        sbbl    $0,FPU_accum_3
+        je      LDo_2nd_32_bits         /* Must check for non-zero result here */
+
+#ifdef PARANOID
+        jb      L_bugged_1
+#endif /* PARANOID */ 
+
+        /* need to subtract another once of the denom */
+        incl    FPU_result_3    /* Correct the answer */
+
+        movl    XsigL(%ebx),%eax
+        movl    XsigH(%ebx),%edx
+        subl    %eax,FPU_accum_1        /* Subtract from the num local reg */
+        sbbl    %edx,FPU_accum_2
+
+#ifdef PARANOID
+        sbbl    $0,FPU_accum_3
+        jne     L_bugged_1      /* Must check for non-zero result here */
+#endif /* PARANOID */ 
+
+/*----------------------------------------------------------------------*/
+/* Half of the main problem is done, there is just a reduced numerator
+   to handle now.
+   Work with the second 32 bits, FPU_accum_0 not used from now on */
+LDo_2nd_32_bits:
+        movl    FPU_accum_2,%edx        /* get the reduced num */
+        movl    FPU_accum_1,%eax
+
+        /* need to check for possible subsequent overflow */
+        cmpl    XsigH(%ebx),%edx
+        jb      LDo_2nd_div
+        ja      LPrevent_2nd_overflow
+
+        cmpl    XsigL(%ebx),%eax
+        jb      LDo_2nd_div
+
+LPrevent_2nd_overflow:
+/* The numerator is greater or equal, would cause overflow */
+        /* prevent overflow */
+        subl    XsigL(%ebx),%eax
+        sbbl    XsigH(%ebx),%edx
+        movl    %edx,FPU_accum_2
+        movl    %eax,FPU_accum_1
+
+        incl    FPU_result_3    /* Reflect the subtraction in the answer */
+
+#ifdef PARANOID
+        je      L_bugged_2      /* Can't bump the result to 1.0 */
+#endif /* PARANOID */ 
+
+LDo_2nd_div:
+        cmpl    $0,%ecx         /* augmented denom msw */
+        jnz     LSecond_div_not_1
+
+        /* %ecx == 0, we are dividing by 1.0 */
+        mov     %edx,%eax
+        jmp     LSecond_div_done
+
+LSecond_div_not_1:
+        divl    %ecx            /* Divide the numerator by the denom ms dw */
+
+LSecond_div_done:
+        movl    %eax,FPU_result_2       /* Put the result in the answer */
+
+        mull    XsigH(%ebx)     /* mul by the ms dw of the denom */
+
+        subl    %eax,FPU_accum_1        /* Subtract from the num local reg */
+        sbbl    %edx,FPU_accum_2
+
+#ifdef PARANOID
+        jc      L_bugged_2
+#endif /* PARANOID */
+
+        movl    FPU_result_2,%eax       /* Get the result back */
+        mull    XsigL(%ebx)     /* now mul the ls dw of the denom */
+
+        subl    %eax,FPU_accum_0        /* Subtract from the num local reg */
+        sbbl    %edx,FPU_accum_1        /* Subtract from the num local reg */
+        sbbl    $0,FPU_accum_2
+
+#ifdef PARANOID
+        jc      L_bugged_2
+#endif /* PARANOID */
+
+        jz      LDo_3rd_32_bits
+
+#ifdef PARANOID
+        cmpl    $1,FPU_accum_2
+        jne     L_bugged_2
+#endif /* PARANOID */ 
+
+        /* need to subtract another once of the denom */
+        movl    XsigL(%ebx),%eax
+        movl    XsigH(%ebx),%edx
+        subl    %eax,FPU_accum_0        /* Subtract from the num local reg */
+        sbbl    %edx,FPU_accum_1
+        sbbl    $0,FPU_accum_2
+
+#ifdef PARANOID
+        jc      L_bugged_2
+        jne     L_bugged_2
+#endif /* PARANOID */ 
+
+        addl    $1,FPU_result_2 /* Correct the answer */
+        adcl    $0,FPU_result_3
+
+#ifdef PARANOID
+        jc      L_bugged_2      /* Must check for non-zero result here */
+#endif /* PARANOID */ 
+
+/*----------------------------------------------------------------------*/
+/* The division is essentially finished here, we just need to perform
+   tidying operations.
+   Deal with the 3rd 32 bits */
+LDo_3rd_32_bits:
+        /* We use an approximation for the third 32 bits.
+        To take account of the 3rd 32 bits of the divisor
+        (call them del), we subtract  del * (a/b) */
+
+        movl    FPU_result_3,%eax       /* a/b */
+        mull    XsigLL(%ebx)            /* del */
+
+        subl    %edx,FPU_accum_1
+
+        /* A borrow indicates that the result is negative */
+        jnb     LTest_over
+
+        movl    XsigH(%ebx),%edx
+        addl    %edx,FPU_accum_1
+
+        subl    $1,FPU_result_2         /* Adjust the answer */
+        sbbl    $0,FPU_result_3
+
+        /* The above addition might not have been enough, check again. */
+        movl    FPU_accum_1,%edx        /* get the reduced num */
+        cmpl    XsigH(%ebx),%edx        /* denom */
+        jb      LDo_3rd_div
+
+        movl    XsigH(%ebx),%edx
+        addl    %edx,FPU_accum_1
+
+        subl    $1,FPU_result_2         /* Adjust the answer */
+        sbbl    $0,FPU_result_3
+        jmp     LDo_3rd_div
+
+LTest_over:
+        movl    FPU_accum_1,%edx        /* get the reduced num */
+
+        /* need to check for possible subsequent overflow */
+        cmpl    XsigH(%ebx),%edx        /* denom */
+        jb      LDo_3rd_div
+
+        /* prevent overflow */
+        subl    XsigH(%ebx),%edx
+        movl    %edx,FPU_accum_1
+
+        addl    $1,FPU_result_2 /* Reflect the subtraction in the answer */
+        adcl    $0,FPU_result_3
+
+LDo_3rd_div:
+        movl    FPU_accum_0,%eax
+        movl    FPU_accum_1,%edx
+        divl    XsigH(%ebx)
+
+        movl    %eax,FPU_result_1       /* Rough estimate of third word */
+
+        movl    PARAM3,%esi             /* pointer to answer */
+
+        movl    FPU_result_1,%eax
+        movl    %eax,XsigLL(%esi)
+        movl    FPU_result_2,%eax
+        movl    %eax,XsigL(%esi)
+        movl    FPU_result_3,%eax
+        movl    %eax,XsigH(%esi)
+
+L_exit:
+        popl    %ebx
+        popl    %edi
+        popl    %esi
+
+        leave
+        ret
+
+
+#ifdef PARANOID
+/* The logic is wrong if we got here */
+L_bugged:
+        pushl   EX_INTERNAL|0x240
+        call    EXCEPTION
+        pop     %ebx
+        jmp     L_exit
+
+L_bugged_1:
+        pushl   EX_INTERNAL|0x241
+        call    EXCEPTION
+        pop     %ebx
+        jmp     L_exit
+
+L_bugged_2:
+        pushl   EX_INTERNAL|0x242
+        call    EXCEPTION
+        pop     %ebx
+        jmp     L_exit
+#endif /* PARANOID */ 
diff --git a/arch/i386/math-emu/div_small.S b/arch/i386/math-emu/div_small.S
new file mode 100644
index 000000000000..47099628fa4c
--- /dev/null
+++ b/arch/i386/math-emu/div_small.S
@@ -0,0 +1,47 @@
+        .file   "div_small.S"
+/*---------------------------------------------------------------------------+
+ |  div_small.S                                                              |
+ |                                                                           |
+ | Divide a 64 bit integer by a 32 bit integer & return remainder.           |
+ |                                                                           |
+ | Copyright (C) 1992,1995                                                   |
+ |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
+ |                       Australia.  E-mail billm@jacobi.maths.monash.edu.au |
+ |                                                                           |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------+
+ |    unsigned long FPU_div_small(unsigned long long *x, unsigned long y)    |
+ +---------------------------------------------------------------------------*/
+
+#include "fpu_emu.h"
+
+.text
+ENTRY(FPU_div_small)
+        pushl   %ebp
+        movl    %esp,%ebp
+
+        pushl   %esi
+
+        movl    PARAM1,%esi     /* pointer to num */
+        movl    PARAM2,%ecx     /* The denominator */
+
+        movl    4(%esi),%eax    /* Get the current num msw */
+        xorl    %edx,%edx
+        divl    %ecx
+
+        movl    %eax,4(%esi)
+
+        movl    (%esi),%eax     /* Get the num lsw */
+        divl    %ecx
+
+        movl    %eax,(%esi)
+
+        movl    %edx,%eax       /* Return the remainder in eax */
+
+        popl    %esi
+
+        leave
+        ret
+
diff --git a/arch/i386/math-emu/errors.c b/arch/i386/math-emu/errors.c
new file mode 100644
index 000000000000..a1b0d22f6978
--- /dev/null
+++ b/arch/i386/math-emu/errors.c
@@ -0,0 +1,739 @@
+/*---------------------------------------------------------------------------+
+ |  errors.c                                                                 |
+ |                                                                           |
+ |  The error handling functions for wm-FPU-emu                              |
+ |                                                                           |
+ | Copyright (C) 1992,1993,1994,1996                                         |
+ |                  W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia |
+ |                  E-mail   billm@jacobi.maths.monash.edu.au                |
+ |                                                                           |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------+
+ | Note:                                                                     |
+ |    The file contains code which accesses user memory.                     |
+ |    Emulator static data may change when user memory is accessed, due to   |
+ |    other processes using the emulator while swapping is in progress.      |
+ +---------------------------------------------------------------------------*/
+
+#include <linux/signal.h>
+
+#include <asm/uaccess.h>
+
+#include "fpu_emu.h"
+#include "fpu_system.h"
+#include "exception.h"
+#include "status_w.h"
+#include "control_w.h"
+#include "reg_constant.h"
+#include "version.h"
+
+/* */
+#undef PRINT_MESSAGES
+/* */
+
+
+#if 0
+void Un_impl(void)
+{
+  u_char byte1, FPU_modrm;
+  unsigned long address = FPU_ORIG_EIP;
+
+  RE_ENTRANT_CHECK_OFF;
+  /* No need to check access_ok(), we have previously fetched these bytes. */
+  printk("Unimplemented FPU Opcode at eip=%p : ", (void __user *) address);
+  if ( FPU_CS == __USER_CS )
+    {
+      while ( 1 )
+        {
+          FPU_get_user(byte1, (u_char __user *) address);
+          if ( (byte1 & 0xf8) == 0xd8 ) break;
+          printk("[%02x]", byte1);
+          address++;
+        }
+      printk("%02x ", byte1);
+      FPU_get_user(FPU_modrm, 1 + (u_char __user *) address);
+      
+      if (FPU_modrm >= 0300)
+        printk("%02x (%02x+%d)\n", FPU_modrm, FPU_modrm & 0xf8, FPU_modrm & 7);
+      else
+        printk("/%d\n", (FPU_modrm >> 3) & 7);
+    }
+  else
+    {
+      printk("cs selector = %04x\n", FPU_CS);
+    }
+
+  RE_ENTRANT_CHECK_ON;
+
+  EXCEPTION(EX_Invalid);
+
+}
+#endif  /*  0  */
+
+
+/*
+   Called for opcodes which are illegal and which are known to result in a
+   SIGILL with a real 80486.
+   */
+void FPU_illegal(void)
+{
+  math_abort(FPU_info,SIGILL);
+}
+
+
+
+void FPU_printall(void)
+{
+  int i;
+  static const char *tag_desc[] = { "Valid", "Zero", "ERROR", "Empty",
+                              "DeNorm", "Inf", "NaN" };
+  u_char byte1, FPU_modrm;
+  unsigned long address = FPU_ORIG_EIP;
+
+  RE_ENTRANT_CHECK_OFF;
+  /* No need to check access_ok(), we have previously fetched these bytes. */
+  printk("At %p:", (void *) address);
+  if ( FPU_CS == __USER_CS )
+    {
+#define MAX_PRINTED_BYTES 20
+      for ( i = 0; i < MAX_PRINTED_BYTES; i++ )
+        {
+          FPU_get_user(byte1, (u_char __user *) address);
+          if ( (byte1 & 0xf8) == 0xd8 )
+            {
+              printk(" %02x", byte1);
+              break;
+            }
+          printk(" [%02x]", byte1);
+          address++;
+        }
+      if ( i == MAX_PRINTED_BYTES )
+        printk(" [more..]\n");
+      else
+        {
+          FPU_get_user(FPU_modrm, 1 + (u_char __user *) address);
+          
+          if (FPU_modrm >= 0300)
+            printk(" %02x (%02x+%d)\n", FPU_modrm, FPU_modrm & 0xf8, FPU_modrm & 7);
+          else
+            printk(" /%d, mod=%d rm=%d\n",
+                   (FPU_modrm >> 3) & 7, (FPU_modrm >> 6) & 3, FPU_modrm & 7);
+        }
+    }
+  else
+    {
+      printk("%04x\n", FPU_CS);
+    }
+
+  partial_status = status_word();
+
+#ifdef DEBUGGING
+if ( partial_status & SW_Backward )    printk("SW: backward compatibility\n");
+if ( partial_status & SW_C3 )          printk("SW: condition bit 3\n");
+if ( partial_status & SW_C2 )          printk("SW: condition bit 2\n");
+if ( partial_status & SW_C1 )          printk("SW: condition bit 1\n");
+if ( partial_status & SW_C0 )          printk("SW: condition bit 0\n");
+if ( partial_status & SW_Summary )     printk("SW: exception summary\n");
+if ( partial_status & SW_Stack_Fault ) printk("SW: stack fault\n");
+if ( partial_status & SW_Precision )   printk("SW: loss of precision\n");
+if ( partial_status & SW_Underflow )   printk("SW: underflow\n");
+if ( partial_status & SW_Overflow )    printk("SW: overflow\n");
+if ( partial_status & SW_Zero_Div )    printk("SW: divide by zero\n");
+if ( partial_status & SW_Denorm_Op )   printk("SW: denormalized operand\n");
+if ( partial_status & SW_Invalid )     printk("SW: invalid operation\n");
+#endif /* DEBUGGING */
+
+  printk(" SW: b=%d st=%ld es=%d sf=%d cc=%d%d%d%d ef=%d%d%d%d%d%d\n",
+         partial_status & 0x8000 ? 1 : 0,   /* busy */
+         (partial_status & 0x3800) >> 11,   /* stack top pointer */
+         partial_status & 0x80 ? 1 : 0,     /* Error summary status */
+         partial_status & 0x40 ? 1 : 0,     /* Stack flag */
+         partial_status & SW_C3?1:0, partial_status & SW_C2?1:0, /* cc */
+         partial_status & SW_C1?1:0, partial_status & SW_C0?1:0, /* cc */
+         partial_status & SW_Precision?1:0, partial_status & SW_Underflow?1:0,
+         partial_status & SW_Overflow?1:0, partial_status & SW_Zero_Div?1:0,
+         partial_status & SW_Denorm_Op?1:0, partial_status & SW_Invalid?1:0);
+  
+printk(" CW: ic=%d rc=%ld%ld pc=%ld%ld iem=%d     ef=%d%d%d%d%d%d\n",
+         control_word & 0x1000 ? 1 : 0,
+         (control_word & 0x800) >> 11, (control_word & 0x400) >> 10,
+         (control_word & 0x200) >> 9, (control_word & 0x100) >> 8,
+         control_word & 0x80 ? 1 : 0,
+         control_word & SW_Precision?1:0, control_word & SW_Underflow?1:0,
+         control_word & SW_Overflow?1:0, control_word & SW_Zero_Div?1:0,
+         control_word & SW_Denorm_Op?1:0, control_word & SW_Invalid?1:0);
+
+  for ( i = 0; i < 8; i++ )
+    {
+      FPU_REG *r = &st(i);
+      u_char tagi = FPU_gettagi(i);
+      switch (tagi)
+        {
+        case TAG_Empty:
+          continue;
+          break;
+        case TAG_Zero:
+        case TAG_Special:
+          tagi = FPU_Special(r);
+        case TAG_Valid:
+          printk("st(%d)  %c .%04lx %04lx %04lx %04lx e%+-6d ", i,
+                 getsign(r) ? '-' : '+',
+                 (long)(r->sigh >> 16),
+                 (long)(r->sigh & 0xFFFF),
+                 (long)(r->sigl >> 16),
+                 (long)(r->sigl & 0xFFFF),
+                 exponent(r) - EXP_BIAS + 1);
+          break;
+        default:
+          printk("Whoops! Error in errors.c: tag%d is %d ", i, tagi);
+          continue;
+          break;
+        }
+      printk("%s\n", tag_desc[(int) (unsigned) tagi]);
+    }
+
+  RE_ENTRANT_CHECK_ON;
+
+}
+
+static struct {
+  int type;
+  const char *name;
+} exception_names[] = {
+  { EX_StackOver, "stack overflow" },
+  { EX_StackUnder, "stack underflow" },
+  { EX_Precision, "loss of precision" },
+  { EX_Underflow, "underflow" },
+  { EX_Overflow, "overflow" },
+  { EX_ZeroDiv, "divide by zero" },
+  { EX_Denormal, "denormalized operand" },
+  { EX_Invalid, "invalid operation" },
+  { EX_INTERNAL, "INTERNAL BUG in "FPU_VERSION },
+  { 0, NULL }
+};
+
+/*
+ EX_INTERNAL is always given with a code which indicates where the
+ error was detected.
+
+ Internal error types:
+       0x14   in fpu_etc.c
+       0x1nn  in a *.c file:
+              0x101  in reg_add_sub.c
+              0x102  in reg_mul.c
+              0x104  in poly_atan.c
+              0x105  in reg_mul.c
+              0x107  in fpu_trig.c
+              0x108  in reg_compare.c
+              0x109  in reg_compare.c
+              0x110  in reg_add_sub.c
+              0x111  in fpe_entry.c
+              0x112  in fpu_trig.c
+              0x113  in errors.c
+              0x115  in fpu_trig.c
+              0x116  in fpu_trig.c
+              0x117  in fpu_trig.c
+              0x118  in fpu_trig.c
+              0x119  in fpu_trig.c
+              0x120  in poly_atan.c
+              0x121  in reg_compare.c
+              0x122  in reg_compare.c
+              0x123  in reg_compare.c
+              0x125  in fpu_trig.c
+              0x126  in fpu_entry.c
+              0x127  in poly_2xm1.c
+              0x128  in fpu_entry.c
+              0x129  in fpu_entry.c
+              0x130  in get_address.c
+              0x131  in get_address.c
+              0x132  in get_address.c
+              0x133  in get_address.c
+              0x140  in load_store.c
+              0x141  in load_store.c
+              0x150  in poly_sin.c
+              0x151  in poly_sin.c
+              0x160  in reg_ld_str.c
+              0x161  in reg_ld_str.c
+              0x162  in reg_ld_str.c
+              0x163  in reg_ld_str.c
+              0x164  in reg_ld_str.c
+              0x170  in fpu_tags.c
+              0x171  in fpu_tags.c
+              0x172  in fpu_tags.c
+              0x180  in reg_convert.c
+       0x2nn  in an *.S file:
+              0x201  in reg_u_add.S
+              0x202  in reg_u_div.S
+              0x203  in reg_u_div.S
+              0x204  in reg_u_div.S
+              0x205  in reg_u_mul.S
+              0x206  in reg_u_sub.S
+              0x207  in wm_sqrt.S
+              0x208  in reg_div.S
+              0x209  in reg_u_sub.S
+              0x210  in reg_u_sub.S
+              0x211  in reg_u_sub.S
+              0x212  in reg_u_sub.S
+              0x213  in wm_sqrt.S
+              0x214  in wm_sqrt.S
+              0x215  in wm_sqrt.S
+              0x220  in reg_norm.S
+              0x221  in reg_norm.S
+              0x230  in reg_round.S
+              0x231  in reg_round.S
+              0x232  in reg_round.S
+              0x233  in reg_round.S
+              0x234  in reg_round.S
+              0x235  in reg_round.S
+              0x236  in reg_round.S
+              0x240  in div_Xsig.S
+              0x241  in div_Xsig.S
+              0x242  in div_Xsig.S
+ */
+
+asmlinkage void FPU_exception(int n)
+{
+  int i, int_type;
+
+  int_type = 0;         /* Needed only to stop compiler warnings */
+  if ( n & EX_INTERNAL )
+    {
+      int_type = n - EX_INTERNAL;
+      n = EX_INTERNAL;
+      /* Set lots of exception bits! */
+      partial_status |= (SW_Exc_Mask | SW_Summary | SW_Backward);
+    }
+  else
+    {
+      /* Extract only the bits which we use to set the status word */
+      n &= (SW_Exc_Mask);
+      /* Set the corresponding exception bit */
+      partial_status |= n;
+      /* Set summary bits iff exception isn't masked */
+      if ( partial_status & ~control_word & CW_Exceptions )
+        partial_status |= (SW_Summary | SW_Backward);
+      if ( n & (SW_Stack_Fault | EX_Precision) )
+        {
+          if ( !(n & SW_C1) )
+            /* This bit distinguishes over- from underflow for a stack fault,
+               and roundup from round-down for precision loss. */
+            partial_status &= ~SW_C1;
+        }
+    }
+
+  RE_ENTRANT_CHECK_OFF;
+  if ( (~control_word & n & CW_Exceptions) || (n == EX_INTERNAL) )
+    {
+#ifdef PRINT_MESSAGES
+      /* My message from the sponsor */
+      printk(FPU_VERSION" "__DATE__" (C) W. Metzenthen.\n");
+#endif /* PRINT_MESSAGES */
+      
+      /* Get a name string for error reporting */
+      for (i=0; exception_names[i].type; i++)
+        if ( (exception_names[i].type & n) == exception_names[i].type )
+          break;
+      
+      if (exception_names[i].type)
+        {
+#ifdef PRINT_MESSAGES
+          printk("FP Exception: %s!\n", exception_names[i].name);
+#endif /* PRINT_MESSAGES */
+        }
+      else
+        printk("FPU emulator: Unknown Exception: 0x%04x!\n", n);
+      
+      if ( n == EX_INTERNAL )
+        {
+          printk("FPU emulator: Internal error type 0x%04x\n", int_type);
+          FPU_printall();
+        }
+#ifdef PRINT_MESSAGES
+      else
+        FPU_printall();
+#endif /* PRINT_MESSAGES */
+
+      /*
+       * The 80486 generates an interrupt on the next non-control FPU
+       * instruction. So we need some means of flagging it.
+       * We use the ES (Error Summary) bit for this.
+       */
+    }
+  RE_ENTRANT_CHECK_ON;
+
+#ifdef __DEBUG__
+  math_abort(FPU_info,SIGFPE);
+#endif /* __DEBUG__ */
+
+}
+
+
+/* Real operation attempted on a NaN. */
+/* Returns < 0 if the exception is unmasked */
+int real_1op_NaN(FPU_REG *a)
+{
+  int signalling, isNaN;
+
+  isNaN = (exponent(a) == EXP_OVER) && (a->sigh & 0x80000000);
+
+  /* The default result for the case of two "equal" NaNs (signs may
+     differ) is chosen to reproduce 80486 behaviour */
+  signalling = isNaN && !(a->sigh & 0x40000000);
+
+  if ( !signalling )
+    {
+      if ( !isNaN )  /* pseudo-NaN, or other unsupported? */
+        {
+          if ( control_word & CW_Invalid )
+            {
+              /* Masked response */
+              reg_copy(&CONST_QNaN, a);
+            }
+          EXCEPTION(EX_Invalid);
+          return (!(control_word & CW_Invalid) ? FPU_Exception : 0) | TAG_Special;
+        }
+      return TAG_Special;
+    }
+
+  if ( control_word & CW_Invalid )
+    {
+      /* The masked response */
+      if ( !(a->sigh & 0x80000000) )  /* pseudo-NaN ? */
+        {
+          reg_copy(&CONST_QNaN, a);
+        }
+      /* ensure a Quiet NaN */
+      a->sigh |= 0x40000000;
+    }
+
+  EXCEPTION(EX_Invalid);
+
+  return (!(control_word & CW_Invalid) ? FPU_Exception : 0) | TAG_Special;
+}
+
+
+/* Real operation attempted on two operands, one a NaN. */
+/* Returns < 0 if the exception is unmasked */
+int real_2op_NaN(FPU_REG const *b, u_char tagb,
+                 int deststnr,
+                 FPU_REG const *defaultNaN)
+{
+  FPU_REG *dest = &st(deststnr);
+  FPU_REG const *a = dest;
+  u_char taga = FPU_gettagi(deststnr);
+  FPU_REG const *x;
+  int signalling, unsupported;
+
+  if ( taga == TAG_Special )
+    taga = FPU_Special(a);
+  if ( tagb == TAG_Special )
+    tagb = FPU_Special(b);
+
+  /* TW_NaN is also used for unsupported data types. */
+  unsupported = ((taga == TW_NaN)
+                 && !((exponent(a) == EXP_OVER) && (a->sigh & 0x80000000)))
+    || ((tagb == TW_NaN)
+        && !((exponent(b) == EXP_OVER) && (b->sigh & 0x80000000)));
+  if ( unsupported )
+    {
+      if ( control_word & CW_Invalid )
+        {
+          /* Masked response */
+          FPU_copy_to_regi(&CONST_QNaN, TAG_Special, deststnr);
+        }
+      EXCEPTION(EX_Invalid);
+      return (!(control_word & CW_Invalid) ? FPU_Exception : 0) | TAG_Special;
+    }
+
+  if (taga == TW_NaN)
+    {
+      x = a;
+      if (tagb == TW_NaN)
+        {
+          signalling = !(a->sigh & b->sigh & 0x40000000);
+          if ( significand(b) > significand(a) )
+            x = b;
+          else if ( significand(b) == significand(a) )
+            {
+              /* The default result for the case of two "equal" NaNs (signs may
+                 differ) is chosen to reproduce 80486 behaviour */
+              x = defaultNaN;
+            }
+        }
+      else
+        {
+          /* return the quiet version of the NaN in a */
+          signalling = !(a->sigh & 0x40000000);
+        }
+    }
+  else
+#ifdef PARANOID
+    if (tagb == TW_NaN)
+#endif /* PARANOID */
+    {
+      signalling = !(b->sigh & 0x40000000);
+      x = b;
+    }
+#ifdef PARANOID
+  else
+    {
+      signalling = 0;
+      EXCEPTION(EX_INTERNAL|0x113);
+      x = &CONST_QNaN;
+    }
+#endif /* PARANOID */
+
+  if ( (!signalling) || (control_word & CW_Invalid) )
+    {
+      if ( ! x )
+        x = b;
+
+      if ( !(x->sigh & 0x80000000) )  /* pseudo-NaN ? */
+        x = &CONST_QNaN;
+
+      FPU_copy_to_regi(x, TAG_Special, deststnr);
+
+      if ( !signalling )
+        return TAG_Special;
+
+      /* ensure a Quiet NaN */
+      dest->sigh |= 0x40000000;
+    }
+
+  EXCEPTION(EX_Invalid);
+
+  return (!(control_word & CW_Invalid) ? FPU_Exception : 0) | TAG_Special;
+}
+
+
+/* Invalid arith operation on Valid registers */
+/* Returns < 0 if the exception is unmasked */
+asmlinkage int arith_invalid(int deststnr)
+{
+
+  EXCEPTION(EX_Invalid);
+  
+  if ( control_word & CW_Invalid )
+    {
+      /* The masked response */
+      FPU_copy_to_regi(&CONST_QNaN, TAG_Special, deststnr);
+    }
+  
+  return (!(control_word & CW_Invalid) ? FPU_Exception : 0) | TAG_Valid;
+
+}
+
+
+/* Divide a finite number by zero */
+asmlinkage int FPU_divide_by_zero(int deststnr, u_char sign)
+{
+  FPU_REG *dest = &st(deststnr);
+  int tag = TAG_Valid;
+
+  if ( control_word & CW_ZeroDiv )
+    {
+      /* The masked response */
+      FPU_copy_to_regi(&CONST_INF, TAG_Special, deststnr);
+      setsign(dest, sign);
+      tag = TAG_Special;
+    }
+ 
+  EXCEPTION(EX_ZeroDiv);
+
+  return (!(control_word & CW_ZeroDiv) ? FPU_Exception : 0) | tag;
+
+}
+
+
+/* This may be called often, so keep it lean */
+int set_precision_flag(int flags)
+{
+  if ( control_word & CW_Precision )
+    {
+      partial_status &= ~(SW_C1 & flags);
+      partial_status |= flags;   /* The masked response */
+      return 0;
+    }
+  else
+    {
+      EXCEPTION(flags);
+      return 1;
+    }
+}
+
+
+/* This may be called often, so keep it lean */
+asmlinkage void set_precision_flag_up(void)
+{
+  if ( control_word & CW_Precision )
+    partial_status |= (SW_Precision | SW_C1);   /* The masked response */
+  else
+    EXCEPTION(EX_Precision | SW_C1);
+}
+
+
+/* This may be called often, so keep it lean */
+asmlinkage void set_precision_flag_down(void)
+{
+  if ( control_word & CW_Precision )
+    {   /* The masked response */
+      partial_status &= ~SW_C1;
+      partial_status |= SW_Precision;
+    }
+  else
+    EXCEPTION(EX_Precision);
+}
+
+
+asmlinkage int denormal_operand(void)
+{
+  if ( control_word & CW_Denormal )
+    {   /* The masked response */
+      partial_status |= SW_Denorm_Op;
+      return TAG_Special;
+    }
+  else
+    {
+      EXCEPTION(EX_Denormal);
+      return TAG_Special | FPU_Exception;
+    }
+}
+
+
+asmlinkage int arith_overflow(FPU_REG *dest)
+{
+  int tag = TAG_Valid;
+
+  if ( control_word & CW_Overflow )
+    {
+      /* The masked response */
+/* ###### The response here depends upon the rounding mode */
+      reg_copy(&CONST_INF, dest);
+      tag = TAG_Special;
+    }
+  else
+    {
+      /* Subtract the magic number from the exponent */
+      addexponent(dest, (-3 * (1 << 13)));
+    }
+
+  EXCEPTION(EX_Overflow);
+  if ( control_word & CW_Overflow )
+    {
+      /* The overflow exception is masked. */
+      /* By definition, precision is lost.
+         The roundup bit (C1) is also set because we have
+         "rounded" upwards to Infinity. */
+      EXCEPTION(EX_Precision | SW_C1);
+      return tag;
+    }
+
+  return tag;
+
+}
+
+
+asmlinkage int arith_underflow(FPU_REG *dest)
+{
+  int tag = TAG_Valid;
+
+  if ( control_word & CW_Underflow )
+    {
+      /* The masked response */
+      if ( exponent16(dest) <= EXP_UNDER - 63 )
+        {
+          reg_copy(&CONST_Z, dest);
+          partial_status &= ~SW_C1;       /* Round down. */
+          tag = TAG_Zero;
+        }
+      else
+        {
+          stdexp(dest);
+        }
+    }
+  else
+    {
+      /* Add the magic number to the exponent. */
+      addexponent(dest, (3 * (1 << 13)) + EXTENDED_Ebias);
+    }
+
+  EXCEPTION(EX_Underflow);
+  if ( control_word & CW_Underflow )
+    {
+      /* The underflow exception is masked. */
+      EXCEPTION(EX_Precision);
+      return tag;
+    }
+
+  return tag;
+
+}
+
+
+void FPU_stack_overflow(void)
+{
+
+ if ( control_word & CW_Invalid )
+    {
+      /* The masked response */
+      top--;
+      FPU_copy_to_reg0(&CONST_QNaN, TAG_Special);
+    }
+
+  EXCEPTION(EX_StackOver);
+
+  return;
+
+}
+
+
+void FPU_stack_underflow(void)
+{
+
+ if ( control_word & CW_Invalid )
+    {
+      /* The masked response */
+      FPU_copy_to_reg0(&CONST_QNaN, TAG_Special);
+    }
+
+  EXCEPTION(EX_StackUnder);
+
+  return;
+
+}
+
+
+void FPU_stack_underflow_i(int i)
+{
+
+ if ( control_word & CW_Invalid )
+    {
+      /* The masked response */
+      FPU_copy_to_regi(&CONST_QNaN, TAG_Special, i);
+    }
+
+  EXCEPTION(EX_StackUnder);
+
+  return;
+
+}
+
+
+void FPU_stack_underflow_pop(int i)
+{
+
+ if ( control_word & CW_Invalid )
+    {
+      /* The masked response */
+      FPU_copy_to_regi(&CONST_QNaN, TAG_Special, i);
+      FPU_pop();
+    }
+
+  EXCEPTION(EX_StackUnder);
+
+  return;
+
+}
+
diff --git a/arch/i386/math-emu/exception.h b/arch/i386/math-emu/exception.h
new file mode 100644
index 000000000000..b463f21a811e
--- /dev/null
+++ b/arch/i386/math-emu/exception.h
@@ -0,0 +1,53 @@
+/*---------------------------------------------------------------------------+
+ |  exception.h                                                              |
+ |                                                                           |
+ | Copyright (C) 1992    W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
+ |                       Australia.  E-mail   billm@vaxc.cc.monash.edu.au    |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+#ifndef _EXCEPTION_H_
+#define _EXCEPTION_H_
+
+
+#ifdef __ASSEMBLY__
+#define Const_(x)       $##x
+#else
+#define Const_(x)       x
+#endif
+
+#ifndef SW_C1
+#include "fpu_emu.h"
+#endif /* SW_C1 */
+
+#define FPU_BUSY        Const_(0x8000)   /* FPU busy bit (8087 compatibility) */
+#define EX_ErrorSummary Const_(0x0080)   /* Error summary status */
+/* Special exceptions: */
+#define EX_INTERNAL     Const_(0x8000)  /* Internal error in wm-FPU-emu */
+#define EX_StackOver    Const_(0x0041|SW_C1)    /* stack overflow */
+#define EX_StackUnder   Const_(0x0041)  /* stack underflow */
+/* Exception flags: */
+#define EX_Precision    Const_(0x0020)  /* loss of precision */
+#define EX_Underflow    Const_(0x0010)  /* underflow */
+#define EX_Overflow     Const_(0x0008)  /* overflow */
+#define EX_ZeroDiv      Const_(0x0004)  /* divide by zero */
+#define EX_Denormal     Const_(0x0002)  /* denormalized operand */
+#define EX_Invalid      Const_(0x0001)  /* invalid operation */
+
+
+#define PRECISION_LOST_UP    Const_((EX_Precision | SW_C1))
+#define PRECISION_LOST_DOWN  Const_(EX_Precision)
+
+
+#ifndef __ASSEMBLY__
+
+#ifdef DEBUG
+#define EXCEPTION(x)    { printk("exception in %s at line %d\n", \
+        __FILE__, __LINE__); FPU_exception(x); }
+#else
+#define EXCEPTION(x)    FPU_exception(x)
+#endif
+
+#endif /* __ASSEMBLY__ */ 
+
+#endif /* _EXCEPTION_H_ */
diff --git a/arch/i386/math-emu/fpu_arith.c b/arch/i386/math-emu/fpu_arith.c
new file mode 100644
index 000000000000..6972dec01af6
--- /dev/null
+++ b/arch/i386/math-emu/fpu_arith.c
@@ -0,0 +1,174 @@
+/*---------------------------------------------------------------------------+
+ |  fpu_arith.c                                                              |
+ |                                                                           |
+ | Code to implement the FPU register/register arithmetic instructions       |
+ |                                                                           |
+ | Copyright (C) 1992,1993,1997                                              |
+ |                  W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia |
+ |                  E-mail   billm@suburbia.net                              |
+ |                                                                           |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+#include "fpu_system.h"
+#include "fpu_emu.h"
+#include "control_w.h"
+#include "status_w.h"
+
+
+void fadd__(void)
+{
+  /* fadd st,st(i) */
+  int i = FPU_rm;
+  clear_C1();
+  FPU_add(&st(i), FPU_gettagi(i), 0, control_word);
+}
+
+
+void fmul__(void)
+{
+  /* fmul st,st(i) */
+  int i = FPU_rm;
+  clear_C1();
+  FPU_mul(&st(i), FPU_gettagi(i), 0, control_word);
+}
+
+
+
+void fsub__(void)
+{
+  /* fsub st,st(i) */
+  clear_C1();
+  FPU_sub(0, FPU_rm, control_word);
+}
+
+
+void fsubr_(void)
+{
+  /* fsubr st,st(i) */
+  clear_C1();
+  FPU_sub(REV, FPU_rm, control_word);
+}
+
+
+void fdiv__(void)
+{
+  /* fdiv st,st(i) */
+  clear_C1();
+  FPU_div(0, FPU_rm, control_word);
+}
+
+
+void fdivr_(void)
+{
+  /* fdivr st,st(i) */
+  clear_C1();
+  FPU_div(REV, FPU_rm, control_word);
+}
+
+
+
+void fadd_i(void)
+{
+  /* fadd st(i),st */
+  int i = FPU_rm;
+  clear_C1();
+  FPU_add(&st(i), FPU_gettagi(i), i, control_word);
+}
+
+
+void fmul_i(void)
+{
+  /* fmul st(i),st */
+  clear_C1();
+  FPU_mul(&st(0), FPU_gettag0(), FPU_rm, control_word);
+}
+
+
+void fsubri(void)
+{
+  /* fsubr st(i),st */
+  clear_C1();
+  FPU_sub(DEST_RM, FPU_rm, control_word);
+}
+
+
+void fsub_i(void)
+{
+  /* fsub st(i),st */
+  clear_C1();
+  FPU_sub(REV|DEST_RM, FPU_rm, control_word);
+}
+
+
+void fdivri(void)
+{
+  /* fdivr st(i),st */
+  clear_C1();
+  FPU_div(DEST_RM, FPU_rm, control_word);
+}
+
+
+void fdiv_i(void)
+{
+  /* fdiv st(i),st */
+  clear_C1();
+  FPU_div(REV|DEST_RM, FPU_rm, control_word);
+}
+
+
+
+void faddp_(void)
+{
+  /* faddp st(i),st */
+  int i = FPU_rm;
+  clear_C1();
+  if ( FPU_add(&st(i), FPU_gettagi(i), i, control_word) >= 0 )
+    FPU_pop();
+}
+
+
+void fmulp_(void)
+{
+  /* fmulp st(i),st */
+  clear_C1();
+  if ( FPU_mul(&st(0), FPU_gettag0(), FPU_rm, control_word) >= 0 )
+    FPU_pop();
+}
+
+
+
+void fsubrp(void)
+{
+  /* fsubrp st(i),st */
+  clear_C1();
+  if ( FPU_sub(DEST_RM, FPU_rm, control_word) >= 0 )
+    FPU_pop();
+}
+
+
+void fsubp_(void)
+{
+  /* fsubp st(i),st */
+  clear_C1();
+  if ( FPU_sub(REV|DEST_RM, FPU_rm, control_word) >= 0 )
+    FPU_pop();
+}
+
+
+void fdivrp(void)
+{
+  /* fdivrp st(i),st */
+  clear_C1();
+  if ( FPU_div(DEST_RM, FPU_rm, control_word) >= 0 )
+    FPU_pop();
+}
+
+
+void fdivp_(void)
+{
+  /* fdivp st(i),st */
+  clear_C1();
+  if ( FPU_div(REV|DEST_RM, FPU_rm, control_word) >= 0 )
+    FPU_pop();
+}
diff --git a/arch/i386/math-emu/fpu_asm.h b/arch/i386/math-emu/fpu_asm.h
new file mode 100644
index 000000000000..9ba12416df12
--- /dev/null
+++ b/arch/i386/math-emu/fpu_asm.h
@@ -0,0 +1,32 @@
+/*---------------------------------------------------------------------------+
+ |  fpu_asm.h                                                                |
+ |                                                                           |
+ | Copyright (C) 1992,1995,1997                                              |
+ |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
+ |                       Australia.  E-mail billm@suburbia.net               |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+#ifndef _FPU_ASM_H_
+#define _FPU_ASM_H_
+
+#include <linux/linkage.h>
+
+#define EXCEPTION       FPU_exception
+
+
+#define PARAM1  8(%ebp)
+#define PARAM2  12(%ebp)
+#define PARAM3  16(%ebp)
+#define PARAM4  20(%ebp)
+#define PARAM5  24(%ebp)
+#define PARAM6  28(%ebp)
+#define PARAM7  32(%ebp)
+
+#define SIGL_OFFSET 0
+#define EXP(x)  8(x)
+#define SIG(x)  SIGL_OFFSET##(x)
+#define SIGL(x) SIGL_OFFSET##(x)
+#define SIGH(x) 4(x)
+
+#endif /* _FPU_ASM_H_ */
diff --git a/arch/i386/math-emu/fpu_aux.c b/arch/i386/math-emu/fpu_aux.c
new file mode 100644
index 000000000000..20886cfb9f76
--- /dev/null
+++ b/arch/i386/math-emu/fpu_aux.c
@@ -0,0 +1,204 @@
+/*---------------------------------------------------------------------------+
+ |  fpu_aux.c                                                                |
+ |                                                                           |
+ | Code to implement some of the FPU auxiliary instructions.                 |
+ |                                                                           |
+ | Copyright (C) 1992,1993,1994,1997                                         |
+ |                  W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia |
+ |                  E-mail   billm@suburbia.net                              |
+ |                                                                           |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+#include "fpu_system.h"
+#include "exception.h"
+#include "fpu_emu.h"
+#include "status_w.h"
+#include "control_w.h"
+
+
+static void fnop(void)
+{
+}
+
+static void fclex(void)
+{
+  partial_status &= ~(SW_Backward|SW_Summary|SW_Stack_Fault|SW_Precision|
+                   SW_Underflow|SW_Overflow|SW_Zero_Div|SW_Denorm_Op|
+                   SW_Invalid);
+  no_ip_update = 1;
+}
+
+/* Needs to be externally visible */
+void finit(void)
+{
+  control_word = 0x037f;
+  partial_status = 0;
+  top = 0;            /* We don't keep top in the status word internally. */
+  fpu_tag_word = 0xffff;
+  /* The behaviour is different from that detailed in
+     Section 15.1.6 of the Intel manual */
+  operand_address.offset = 0;
+  operand_address.selector = 0;
+  instruction_address.offset = 0;
+  instruction_address.selector = 0;
+  instruction_address.opcode = 0;
+  no_ip_update = 1;
+}
+
+/*
+ * These are nops on the i387..
+ */
+#define feni fnop
+#define fdisi fnop
+#define fsetpm fnop
+
+static FUNC const finit_table[] = {
+  feni, fdisi, fclex, finit,
+  fsetpm, FPU_illegal, FPU_illegal, FPU_illegal
+};
+
+void finit_(void)
+{
+  (finit_table[FPU_rm])();
+}
+
+
+static void fstsw_ax(void)
+{
+  *(short *) &FPU_EAX = status_word();
+  no_ip_update = 1;
+}
+
+static FUNC const fstsw_table[] = {
+  fstsw_ax, FPU_illegal, FPU_illegal, FPU_illegal,
+  FPU_illegal, FPU_illegal, FPU_illegal, FPU_illegal
+};
+
+void fstsw_(void)
+{
+  (fstsw_table[FPU_rm])();
+}
+
+
+static FUNC const fp_nop_table[] = {
+  fnop, FPU_illegal, FPU_illegal, FPU_illegal,
+  FPU_illegal, FPU_illegal, FPU_illegal, FPU_illegal
+};
+
+void fp_nop(void)
+{
+  (fp_nop_table[FPU_rm])();
+}
+
+
+void fld_i_(void)
+{
+  FPU_REG *st_new_ptr;
+  int i;
+  u_char tag;
+
+  if ( STACK_OVERFLOW )
+    { FPU_stack_overflow(); return; }
+
+  /* fld st(i) */
+  i = FPU_rm;
+  if ( NOT_EMPTY(i) )
+    {
+      reg_copy(&st(i), st_new_ptr);
+      tag = FPU_gettagi(i);
+      push();
+      FPU_settag0(tag);
+    }
+  else
+    {
+      if ( control_word & CW_Invalid )
+        {
+          /* The masked response */
+          FPU_stack_underflow();
+        }
+      else
+        EXCEPTION(EX_StackUnder);
+    }
+
+}
+
+
+void fxch_i(void)
+{
+  /* fxch st(i) */
+  FPU_REG t;
+  int i = FPU_rm;
+  FPU_REG *st0_ptr = &st(0), *sti_ptr = &st(i);
+  long tag_word = fpu_tag_word;
+  int regnr = top & 7, regnri = ((regnr + i) & 7);
+  u_char st0_tag = (tag_word >> (regnr*2)) & 3;
+  u_char sti_tag = (tag_word >> (regnri*2)) & 3;
+
+  if ( st0_tag == TAG_Empty )
+    {
+      if ( sti_tag == TAG_Empty )
+        {
+          FPU_stack_underflow();
+          FPU_stack_underflow_i(i);
+          return;
+        }
+      if ( control_word & CW_Invalid )
+        {
+          /* Masked response */
+          FPU_copy_to_reg0(sti_ptr, sti_tag);
+        }
+      FPU_stack_underflow_i(i);
+      return;
+    }
+  if ( sti_tag == TAG_Empty )
+    {
+      if ( control_word & CW_Invalid )
+        {
+          /* Masked response */
+          FPU_copy_to_regi(st0_ptr, st0_tag, i);
+        }
+      FPU_stack_underflow();
+      return;
+    }
+  clear_C1();
+
+  reg_copy(st0_ptr, &t);
+  reg_copy(sti_ptr, st0_ptr);
+  reg_copy(&t, sti_ptr);
+
+  tag_word &= ~(3 << (regnr*2)) & ~(3 << (regnri*2));
+  tag_word |= (sti_tag << (regnr*2)) | (st0_tag << (regnri*2));
+  fpu_tag_word = tag_word;
+}
+
+
+void ffree_(void)
+{
+  /* ffree st(i) */
+  FPU_settagi(FPU_rm, TAG_Empty);
+}
+
+
+void ffreep(void)
+{
+  /* ffree st(i) + pop - unofficial code */
+  FPU_settagi(FPU_rm, TAG_Empty);
+  FPU_pop();
+}
+
+
+void fst_i_(void)
+{
+  /* fst st(i) */
+  FPU_copy_to_regi(&st(0), FPU_gettag0(), FPU_rm);
+}
+
+
+void fstp_i(void)
+{
+  /* fstp st(i) */
+  FPU_copy_to_regi(&st(0), FPU_gettag0(), FPU_rm);
+  FPU_pop();
+}
+
diff --git a/arch/i386/math-emu/fpu_emu.h b/arch/i386/math-emu/fpu_emu.h
new file mode 100644
index 000000000000..d62b20a3e660
--- /dev/null
+++ b/arch/i386/math-emu/fpu_emu.h
@@ -0,0 +1,217 @@
+/*---------------------------------------------------------------------------+
+ |  fpu_emu.h                                                                |
+ |                                                                           |
+ | Copyright (C) 1992,1993,1994,1997                                         |
+ |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
+ |                       Australia.  E-mail   billm@suburbia.net             |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+
+#ifndef _FPU_EMU_H_
+#define _FPU_EMU_H_
+
+/*
+ * Define PECULIAR_486 to get a closer approximation to 80486 behaviour,
+ * rather than behaviour which appears to be cleaner.
+ * This is a matter of opinion: for all I know, the 80486 may simply
+ * be complying with the IEEE spec. Maybe one day I'll get to see the
+ * spec...
+ */
+#define PECULIAR_486
+
+#ifdef __ASSEMBLY__
+#include "fpu_asm.h"
+#define Const(x)        $##x
+#else
+#define Const(x)        x
+#endif
+
+#define EXP_BIAS        Const(0)
+#define EXP_OVER        Const(0x4000)    /* smallest invalid large exponent */
+#define EXP_UNDER       Const(-0x3fff)   /* largest invalid small exponent */
+#define EXP_WAY_UNDER   Const(-0x6000)   /* Below the smallest denormal, but
+                                            still a 16 bit nr. */
+#define EXP_Infinity    EXP_OVER
+#define EXP_NaN         EXP_OVER
+
+#define EXTENDED_Ebias Const(0x3fff)
+#define EXTENDED_Emin (-0x3ffe)  /* smallest valid exponent */
+
+#define SIGN_POS        Const(0)
+#define SIGN_NEG        Const(0x80)
+
+#define SIGN_Positive   Const(0)
+#define SIGN_Negative   Const(0x8000)
+
+
+/* Keep the order TAG_Valid, TAG_Zero, TW_Denormal */
+/* The following fold to 2 (Special) in the Tag Word */
+#define TW_Denormal     Const(4)        /* De-normal */
+#define TW_Infinity     Const(5)        /* + or - infinity */
+#define TW_NaN          Const(6)        /* Not a Number */
+#define TW_Unsupported  Const(7)        /* Not supported by an 80486 */
+
+#define TAG_Valid       Const(0)        /* valid */
+#define TAG_Zero        Const(1)        /* zero */
+#define TAG_Special     Const(2)        /* De-normal, + or - infinity,
+                                           or Not a Number */
+#define TAG_Empty       Const(3)        /* empty */
+
+#define LOADED_DATA     Const(10101)    /* Special st() number to identify
+                                           loaded data (not on stack). */
+
+/* A few flags (must be >= 0x10). */
+#define REV             0x10
+#define DEST_RM         0x20
+#define LOADED          0x40
+
+#define FPU_Exception   Const(0x80000000)   /* Added to tag returns. */
+
+
+#ifndef __ASSEMBLY__
+
+#include "fpu_system.h"
+
+#include <asm/sigcontext.h>   /* for struct _fpstate */
+#include <asm/math_emu.h>
+#include <linux/linkage.h>
+
+/*
+#define RE_ENTRANT_CHECKING
+ */
+
+#ifdef RE_ENTRANT_CHECKING
+extern u_char emulating;
+#  define RE_ENTRANT_CHECK_OFF emulating = 0
+#  define RE_ENTRANT_CHECK_ON emulating = 1
+#else
+#  define RE_ENTRANT_CHECK_OFF
+#  define RE_ENTRANT_CHECK_ON
+#endif /* RE_ENTRANT_CHECKING */
+
+#define FWAIT_OPCODE 0x9b
+#define OP_SIZE_PREFIX 0x66
+#define ADDR_SIZE_PREFIX 0x67
+#define PREFIX_CS 0x2e
+#define PREFIX_DS 0x3e
+#define PREFIX_ES 0x26
+#define PREFIX_SS 0x36
+#define PREFIX_FS 0x64
+#define PREFIX_GS 0x65
+#define PREFIX_REPE 0xf3
+#define PREFIX_REPNE 0xf2
+#define PREFIX_LOCK 0xf0
+#define PREFIX_CS_ 1
+#define PREFIX_DS_ 2
+#define PREFIX_ES_ 3
+#define PREFIX_FS_ 4
+#define PREFIX_GS_ 5
+#define PREFIX_SS_ 6
+#define PREFIX_DEFAULT 7
+
+struct address {
+  unsigned int offset;
+  unsigned int selector:16;
+  unsigned int opcode:11;
+  unsigned int empty:5;
+};
+struct fpu__reg {
+  unsigned sigl;
+  unsigned sigh;
+  short exp;
+};
+
+typedef void (*FUNC)(void);
+typedef struct fpu__reg FPU_REG;
+typedef void (*FUNC_ST0)(FPU_REG *st0_ptr, u_char st0_tag);
+typedef struct { u_char address_size, operand_size, segment; }
+        overrides;
+/* This structure is 32 bits: */
+typedef struct { overrides override;
+                 u_char default_mode; } fpu_addr_modes;
+/* PROTECTED has a restricted meaning in the emulator; it is used
+   to signal that the emulator needs to do special things to ensure
+   that protection is respected in a segmented model. */
+#define PROTECTED 4
+#define SIXTEEN   1         /* We rely upon this being 1 (true) */
+#define VM86      SIXTEEN
+#define PM16      (SIXTEEN | PROTECTED)
+#define SEG32     PROTECTED
+extern u_char const data_sizes_16[32];
+
+#define register_base ((u_char *) registers )
+#define fpu_register(x)  ( * ((FPU_REG *)( register_base + 10 * (x & 7) )) )
+#define st(x)      ( * ((FPU_REG *)( register_base + 10 * ((top+x) & 7) )) )
+
+#define STACK_OVERFLOW  (FPU_stackoverflow(&st_new_ptr))
+#define NOT_EMPTY(i)    (!FPU_empty_i(i))
+
+#define NOT_EMPTY_ST0   (st0_tag ^ TAG_Empty)
+
+#define poppop() { FPU_pop(); FPU_pop(); }
+
+/* push() does not affect the tags */
+#define push()  { top--; }
+
+#define signbyte(a) (((u_char *)(a))[9])
+#define getsign(a) (signbyte(a) & 0x80)
+#define setsign(a,b) { if (b) signbyte(a) |= 0x80; else signbyte(a) &= 0x7f; }
+#define copysign(a,b) { if (getsign(a)) signbyte(b) |= 0x80; \
+                        else signbyte(b) &= 0x7f; }
+#define changesign(a) { signbyte(a) ^= 0x80; }
+#define setpositive(a) { signbyte(a) &= 0x7f; }
+#define setnegative(a) { signbyte(a) |= 0x80; }
+#define signpositive(a) ( (signbyte(a) & 0x80) == 0 )
+#define signnegative(a) (signbyte(a) & 0x80)
+
+static inline void reg_copy(FPU_REG const *x, FPU_REG *y)
+{
+  *(short *)&(y->exp) = *(const short *)&(x->exp); 
+  *(long long *)&(y->sigl) = *(const long long *)&(x->sigl);
+}
+
+#define exponent(x)  (((*(short *)&((x)->exp)) & 0x7fff) - EXTENDED_Ebias)
+#define setexponentpos(x,y) { (*(short *)&((x)->exp)) = \
+  ((y) + EXTENDED_Ebias) & 0x7fff; }
+#define exponent16(x)         (*(short *)&((x)->exp))
+#define setexponent16(x,y)  { (*(short *)&((x)->exp)) = (y); }
+#define addexponent(x,y)    { (*(short *)&((x)->exp)) += (y); }
+#define stdexp(x)           { (*(short *)&((x)->exp)) += EXTENDED_Ebias; }
+
+#define isdenormal(ptr)   (exponent(ptr) == EXP_BIAS+EXP_UNDER)
+
+#define significand(x) ( ((unsigned long long *)&((x)->sigl))[0] )
+
+
+/*----- Prototypes for functions written in assembler -----*/
+/* extern void reg_move(FPU_REG *a, FPU_REG *b); */
+
+asmlinkage int FPU_normalize(FPU_REG *x);
+asmlinkage int FPU_normalize_nuo(FPU_REG *x);
+asmlinkage int FPU_u_sub(FPU_REG const *arg1, FPU_REG const *arg2,
+                         FPU_REG *answ, unsigned int control_w, u_char sign,
+                         int expa, int expb);
+asmlinkage int FPU_u_mul(FPU_REG const *arg1, FPU_REG const *arg2,
+                         FPU_REG *answ, unsigned int control_w, u_char sign,
+                         int expon);
+asmlinkage int FPU_u_div(FPU_REG const *arg1, FPU_REG const *arg2,
+                         FPU_REG *answ, unsigned int control_w, u_char sign);
+asmlinkage int FPU_u_add(FPU_REG const *arg1, FPU_REG const *arg2,
+                         FPU_REG *answ, unsigned int control_w, u_char sign,
+                         int expa, int expb);
+asmlinkage int wm_sqrt(FPU_REG *n, int dummy1, int dummy2,
+                       unsigned int control_w, u_char sign);
+asmlinkage unsigned     FPU_shrx(void *l, unsigned x);
+asmlinkage unsigned     FPU_shrxs(void *v, unsigned x);
+asmlinkage unsigned long FPU_div_small(unsigned long long *x, unsigned long y);
+asmlinkage int FPU_round(FPU_REG *arg, unsigned int extent, int dummy,
+                         unsigned int control_w, u_char sign);
+
+#ifndef MAKING_PROTO
+#include "fpu_proto.h"
+#endif
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* _FPU_EMU_H_ */
diff --git a/arch/i386/math-emu/fpu_entry.c b/arch/i386/math-emu/fpu_entry.c
new file mode 100644
index 000000000000..d93f16ef828f
--- /dev/null
+++ b/arch/i386/math-emu/fpu_entry.c
@@ -0,0 +1,760 @@
+/*---------------------------------------------------------------------------+
+ |  fpu_entry.c                                                              |
+ |                                                                           |
+ | The entry functions for wm-FPU-emu                                        |
+ |                                                                           |
+ | Copyright (C) 1992,1993,1994,1996,1997                                    |
+ |                  W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia |
+ |                  E-mail   billm@suburbia.net                              |
+ |                                                                           |
+ | See the files "README" and "COPYING" for further copyright and warranty   |
+ | information.                                                              |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------+
+ | Note:                                                                     |
+ |    The file contains code which accesses user memory.                     |
+ |    Emulator static data may change when user memory is accessed, due to   |
+ |    other processes using the emulator while swapping is in progress.      |
+ +---------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------+
+ | math_emulate(), restore_i387_soft() and save_i387_soft() are the only     |
+ | entry points for wm-FPU-emu.                                              |
+ +---------------------------------------------------------------------------*/
+
+#include <linux/signal.h>
+#include <linux/ptrace.h>
+
+#include <asm/uaccess.h>
+#include <asm/desc.h>
+
+#include "fpu_system.h"
+#include "fpu_emu.h"
+#include "exception.h"
+#include "control_w.h"
+#include "status_w.h"
+
+#define __BAD__ FPU_illegal   /* Illegal on an 80486, causes SIGILL */
+
+#ifndef NO_UNDOC_CODE    /* Un-documented FPU op-codes supported by default. */
+
+/* WARNING: These codes are not documented by Intel in their 80486 manual
+   and may not work on FPU clones or later Intel FPUs. */
+
+/* Changes to support the un-doc codes provided by Linus Torvalds. */
+
+#define _d9_d8_ fstp_i    /* unofficial code (19) */
+#define _dc_d0_ fcom_st   /* unofficial code (14) */
+#define _dc_d8_ fcompst   /* unofficial code (1c) */
+#define _dd_c8_ fxch_i    /* unofficial code (0d) */
+#define _de_d0_ fcompst   /* unofficial code (16) */
+#define _df_c0_ ffreep    /* unofficial code (07) ffree + pop */
+#define _df_c8_ fxch_i    /* unofficial code (0f) */
+#define _df_d0_ fstp_i    /* unofficial code (17) */
+#define _df_d8_ fstp_i    /* unofficial code (1f) */
+
+static FUNC const st_instr_table[64] = {
+  fadd__,   fld_i_,     __BAD__, __BAD__, fadd_i,  ffree_,  faddp_,  _df_c0_,
+  fmul__,   fxch_i,     __BAD__, __BAD__, fmul_i,  _dd_c8_, fmulp_,  _df_c8_,
+  fcom_st,  fp_nop,     __BAD__, __BAD__, _dc_d0_, fst_i_,  _de_d0_, _df_d0_,
+  fcompst,  _d9_d8_,    __BAD__, __BAD__, _dc_d8_, fstp_i,  fcompp,  _df_d8_,
+  fsub__,   FPU_etc,    __BAD__, finit_,  fsubri,  fucom_,  fsubrp,  fstsw_,
+  fsubr_,   fconst,     fucompp, __BAD__, fsub_i,  fucomp,  fsubp_,  __BAD__,
+  fdiv__,   FPU_triga,  __BAD__, __BAD__, fdivri,  __BAD__, fdivrp,  __BAD__,
+  fdivr_,   FPU_trigb,  __BAD__, __BAD__, fdiv_i,  __BAD__, fdivp_,  __BAD__,
+};
+
+#else     /* Support only documented FPU op-codes */
+
+static FUNC const st_instr_table[64] = {
+  fadd__,   fld_i_,     __BAD__, __BAD__, fadd_i,  ffree_,  faddp_,  __BAD__,
+  fmul__,   fxch_i,     __BAD__, __BAD__, fmul_i,  __BAD__, fmulp_,  __BAD__,
+  fcom_st,  fp_nop,     __BAD__, __BAD__, __BAD__, fst_i_,  __BAD__, __BAD__,
+  fcompst,  __BAD__,    __BAD__, __BAD__, __BAD__, fstp_i,  fcompp,  __BAD__,
+  fsub__,   FPU_etc,    __BAD__, finit_,  fsubri,  fucom_,  fsubrp,  fstsw_,
+  fsubr_,   fconst,     fucompp, __BAD__, fsub_i,  fucomp,  fsubp_,  __BAD__,
+  fdiv__,   FPU_triga,  __BAD__, __BAD__, fdivri,  __BAD__, fdivrp,  __BAD__,
+  fdivr_,   FPU_trigb,  __BAD__, __BAD__, fdiv_i,  __BAD__, fdivp_,  __BAD__,
+};
+
+#endif /* NO_UNDOC_CODE */
+
+
+#define _NONE_ 0   /* Take no special action */
+#define _REG0_ 1   /* Need to check for not empty st(0) */
+#define _REGI_ 2   /* Need to check for not empty st(0) and st(rm) */
+#define _REGi_ 0   /* Uses st(rm) */
+#define _PUSH_ 3   /* Need to check for space to push onto stack */
+#define _null_ 4   /* Function illegal or not implemented */
+#define _REGIi 5   /* Uses st(0) and st(rm), result to st(rm) */
+#define _REGIp 6   /* Uses st(0) and st(rm), result to st(rm) then pop */
+#define _REGIc 0   /* Compare st(0) and st(rm) */
+#define _REGIn 0   /* Uses st(0) and st(rm), but handle checks later */
+
+#ifndef NO_UNDOC_CODE
+
+/* Un-documented FPU op-codes supported by default. (see above) */
+
+static u_char const type_table[64] = {
+  _REGI_, _NONE_, _null_, _null_, _REGIi, _REGi_, _REGIp, _REGi_,
+  _REGI_, _REGIn, _null_, _null_, _REGIi, _REGI_, _REGIp, _REGI_,
+  _REGIc, _NONE_, _null_, _null_, _REGIc, _REG0_, _REGIc, _REG0_,
+  _REGIc, _REG0_, _null_, _null_, _REGIc, _REG0_, _REGIc, _REG0_,
+  _REGI_, _NONE_, _null_, _NONE_, _REGIi, _REGIc, _REGIp, _NONE_,
+  _REGI_, _NONE_, _REGIc, _null_, _REGIi, _REGIc, _REGIp, _null_,
+  _REGI_, _NONE_, _null_, _null_, _REGIi, _null_, _REGIp, _null_,
+  _REGI_, _NONE_, _null_, _null_, _REGIi, _null_, _REGIp, _null_
+};
+
+#else     /* Support only documented FPU op-codes */
+
+static u_char const type_table[64] = {
+  _REGI_, _NONE_, _null_, _null_, _REGIi, _REGi_, _REGIp, _null_,
+  _REGI_, _REGIn, _null_, _null_, _REGIi, _null_, _REGIp, _null_,
+  _REGIc, _NONE_, _null_, _null_, _null_, _REG0_, _null_, _null_,
+  _REGIc, _null_, _null_, _null_, _null_, _REG0_, _REGIc, _null_,
+  _REGI_, _NONE_, _null_, _NONE_, _REGIi, _REGIc, _REGIp, _NONE_,
+  _REGI_, _NONE_, _REGIc, _null_, _REGIi, _REGIc, _REGIp, _null_,
+  _REGI_, _NONE_, _null_, _null_, _REGIi, _null_, _REGIp, _null_,
+  _REGI_, _NONE_, _null_, _null_, _REGIi, _null_, _REGIp, _null_
+};
+
+#endif /* NO_UNDOC_CODE */
+
+
+#ifdef RE_ENTRANT_CHECKING
+u_char emulating=0;
+#endif /* RE_ENTRANT_CHECKING */
+
+static int valid_prefix(u_char *Byte, u_char __user **fpu_eip,
+                        overrides *override);
+
+asmlinkage void math_emulate(long arg)
+{
+  u_char  FPU_modrm, byte1;
+  unsigned short code;
+  fpu_addr_modes addr_modes;
+  int unmasked;
+  FPU_REG loaded_data;
+  FPU_REG *st0_ptr;
+  u_char          loaded_tag, st0_tag;
+  void __user *data_address;
+  struct address data_sel_off;
+  struct address entry_sel_off;
+  unsigned long code_base = 0;
+  unsigned long code_limit = 0;  /* Initialized to stop compiler warnings */
+  struct desc_struct code_descriptor;
+
+#ifdef RE_ENTRANT_CHECKING
+  if ( emulating )
+    {
+      printk("ERROR: wm-FPU-emu is not RE-ENTRANT!\n");
+    }
+  RE_ENTRANT_CHECK_ON;
+#endif /* RE_ENTRANT_CHECKING */
+
+  if (!used_math())
+    {
+      finit();
+      set_used_math();
+    }
+
+  SETUP_DATA_AREA(arg);
+
+  FPU_ORIG_EIP = FPU_EIP;
+
+  if ( (FPU_EFLAGS & 0x00020000) != 0 )
+    {
+      /* Virtual 8086 mode */
+      addr_modes.default_mode = VM86;
+      FPU_EIP += code_base = FPU_CS << 4;
+      code_limit = code_base + 0xffff;  /* Assumes code_base <= 0xffff0000 */
+    }
+  else if ( FPU_CS == __USER_CS && FPU_DS == __USER_DS )
+    {
+      addr_modes.default_mode = 0;
+    }
+  else if ( FPU_CS == __KERNEL_CS )
+    {
+      printk("math_emulate: %04x:%08lx\n",FPU_CS,FPU_EIP);
+      panic("Math emulation needed in kernel");
+    }
+  else
+    {
+
+      if ( (FPU_CS & 4) != 4 )   /* Must be in the LDT */
+        {
+          /* Can only handle segmented addressing via the LDT
+             for now, and it must be 16 bit */
+          printk("FPU emulator: Unsupported addressing mode\n");
+          math_abort(FPU_info, SIGILL);
+        }
+
+      code_descriptor = LDT_DESCRIPTOR(FPU_CS);
+      if ( SEG_D_SIZE(code_descriptor) )
+        {
+          /* The above test may be wrong, the book is not clear */
+          /* Segmented 32 bit protected mode */
+          addr_modes.default_mode = SEG32;
+        }
+      else
+        {
+          /* 16 bit protected mode */
+          addr_modes.default_mode = PM16;
+        }
+      FPU_EIP += code_base = SEG_BASE_ADDR(code_descriptor);
+      code_limit = code_base
+        + (SEG_LIMIT(code_descriptor)+1) * SEG_GRANULARITY(code_descriptor)
+          - 1;
+      if ( code_limit < code_base ) code_limit = 0xffffffff;
+    }
+
+  FPU_lookahead = 1;
+  if (current->ptrace & PT_PTRACED)
+    FPU_lookahead = 0;
+
+  if ( !valid_prefix(&byte1, (u_char __user **)&FPU_EIP,
+                     &addr_modes.override) )
+    {
+      RE_ENTRANT_CHECK_OFF;
+      printk("FPU emulator: Unknown prefix byte 0x%02x, probably due to\n"
+             "FPU emulator: self-modifying code! (emulation impossible)\n",
+             byte1);
+      RE_ENTRANT_CHECK_ON;
+      EXCEPTION(EX_INTERNAL|0x126);
+      math_abort(FPU_info,SIGILL);
+    }
+
+do_another_FPU_instruction:
+
+  no_ip_update = 0;
+
+  FPU_EIP++;  /* We have fetched the prefix and first code bytes. */
+
+  if ( addr_modes.default_mode )
+    {
+      /* This checks for the minimum instruction bytes.
+         We also need to check any extra (address mode) code access. */
+      if ( FPU_EIP > code_limit )
+        math_abort(FPU_info,SIGSEGV);
+    }
+
+  if ( (byte1 & 0xf8) != 0xd8 )
+    {
+      if ( byte1 == FWAIT_OPCODE )
+        {
+          if (partial_status & SW_Summary)
+            goto do_the_FPU_interrupt;
+          else
+            goto FPU_fwait_done;
+        }
+#ifdef PARANOID
+      EXCEPTION(EX_INTERNAL|0x128);
+      math_abort(FPU_info,SIGILL);
+#endif /* PARANOID */
+    }
+
+  RE_ENTRANT_CHECK_OFF;
+  FPU_code_access_ok(1);
+  FPU_get_user(FPU_modrm, (u_char __user *) FPU_EIP);
+  RE_ENTRANT_CHECK_ON;
+  FPU_EIP++;
+
+  if (partial_status & SW_Summary)
+    {
+      /* Ignore the error for now if the current instruction is a no-wait
+         control instruction */
+      /* The 80486 manual contradicts itself on this topic,
+         but a real 80486 uses the following instructions:
+         fninit, fnstenv, fnsave, fnstsw, fnstenv, fnclex.
+       */
+      code = (FPU_modrm << 8) | byte1;
+      if ( ! ( (((code & 0xf803) == 0xe003) ||    /* fnclex, fninit, fnstsw */
+                (((code & 0x3003) == 0x3001) &&   /* fnsave, fnstcw, fnstenv,
+                                                     fnstsw */
+                 ((code & 0xc000) != 0xc000))) ) )
+        {
+          /*
+           *  We need to simulate the action of the kernel to FPU
+           *  interrupts here.
+           */
+        do_the_FPU_interrupt:
+
+          FPU_EIP = FPU_ORIG_EIP;       /* Point to current FPU instruction. */
+
+          RE_ENTRANT_CHECK_OFF;
+          current->thread.trap_no = 16;
+          current->thread.error_code = 0;
+          send_sig(SIGFPE, current, 1);
+          return;
+        }
+    }
+
+  entry_sel_off.offset = FPU_ORIG_EIP;
+  entry_sel_off.selector = FPU_CS;
+  entry_sel_off.opcode = (byte1 << 8) | FPU_modrm;
+
+  FPU_rm = FPU_modrm & 7;
+
+  if ( FPU_modrm < 0300 )
+    {
+      /* All of these instructions use the mod/rm byte to get a data address */
+
+      if ( (addr_modes.default_mode & SIXTEEN)
+          ^ (addr_modes.override.address_size == ADDR_SIZE_PREFIX) )
+        data_address = FPU_get_address_16(FPU_modrm, &FPU_EIP, &data_sel_off,
+                                          addr_modes);
+      else
+        data_address = FPU_get_address(FPU_modrm, &FPU_EIP, &data_sel_off,
+                                       addr_modes);
+
+      if ( addr_modes.default_mode )
+        {
+          if ( FPU_EIP-1 > code_limit )
+            math_abort(FPU_info,SIGSEGV);
+        }
+
+      if ( !(byte1 & 1) )
+        {
+          unsigned short status1 = partial_status;
+
+          st0_ptr = &st(0);
+          st0_tag = FPU_gettag0();
+
+          /* Stack underflow has priority */
+          if ( NOT_EMPTY_ST0 )
+            {
+              if ( addr_modes.default_mode & PROTECTED )
+                {
+                  /* This table works for 16 and 32 bit protected mode */
+                  if ( access_limit < data_sizes_16[(byte1 >> 1) & 3] )
+                    math_abort(FPU_info,SIGSEGV);
+                }
+
+              unmasked = 0;  /* Do this here to stop compiler warnings. */
+              switch ( (byte1 >> 1) & 3 )
+                {
+                case 0:
+                  unmasked = FPU_load_single((float __user *)data_address,
+                                             &loaded_data);
+                  loaded_tag = unmasked & 0xff;
+                  unmasked &= ~0xff;
+                  break;
+                case 1:
+                  loaded_tag = FPU_load_int32((long __user *)data_address, &loaded_data);
+                  break;
+                case 2:
+                  unmasked = FPU_load_double((double __user *)data_address,
+                                             &loaded_data);
+                  loaded_tag = unmasked & 0xff;
+                  unmasked &= ~0xff;
+                  break;
+                case 3:
+                default:  /* Used here to suppress gcc warnings. */
+                  loaded_tag = FPU_load_int16((short __user *)data_address, &loaded_data);
+                  break;
+                }
+
+              /* No more access to user memory, it is safe
+                 to use static data now */
+
+              /* NaN operands have the next priority. */
+              /* We have to delay looking at st(0) until after
+                 loading the data, because that data might contain an SNaN */
+              if ( ((st0_tag == TAG_Special) && isNaN(st0_ptr)) ||
+                  ((loaded_tag == TAG_Special) && isNaN(&loaded_data)) )
+                {
+                  /* Restore the status word; we might have loaded a
+                     denormal. */
+                  partial_status = status1;
+                  if ( (FPU_modrm & 0x30) == 0x10 )
+                    {
+                      /* fcom or fcomp */
+                      EXCEPTION(EX_Invalid);
+                      setcc(SW_C3 | SW_C2 | SW_C0);
+                      if ( (FPU_modrm & 0x08) && (control_word & CW_Invalid) )
+                        FPU_pop();             /* fcomp, masked, so we pop. */
+                    }
+                  else
+                    {
+                      if ( loaded_tag == TAG_Special )
+                        loaded_tag = FPU_Special(&loaded_data);
+#ifdef PECULIAR_486
+                      /* This is not really needed, but gives behaviour
+                         identical to an 80486 */
+                      if ( (FPU_modrm & 0x28) == 0x20 )
+                        /* fdiv or fsub */
+                        real_2op_NaN(&loaded_data, loaded_tag, 0, &loaded_data);
+                      else
+#endif /* PECULIAR_486 */ 
+                        /* fadd, fdivr, fmul, or fsubr */
+                        real_2op_NaN(&loaded_data, loaded_tag, 0, st0_ptr);
+                    }
+                  goto reg_mem_instr_done;
+                }
+
+              if ( unmasked && !((FPU_modrm & 0x30) == 0x10) )
+                {
+                  /* Is not a comparison instruction. */
+                  if ( (FPU_modrm & 0x38) == 0x38 )
+                    {
+                      /* fdivr */
+                      if ( (st0_tag == TAG_Zero) &&
+                           ((loaded_tag == TAG_Valid)
+                            || (loaded_tag == TAG_Special
+                                && isdenormal(&loaded_data))) )
+                        {
+                          if ( FPU_divide_by_zero(0, getsign(&loaded_data))
+                               < 0 )
+                            {
+                              /* We use the fact here that the unmasked
+                                 exception in the loaded data was for a
+                                 denormal operand */
+                              /* Restore the state of the denormal op bit */
+                              partial_status &= ~SW_Denorm_Op;
+                              partial_status |= status1 & SW_Denorm_Op;
+                            }
+                          else
+                            setsign(st0_ptr, getsign(&loaded_data));
+                        }
+                    }
+                  goto reg_mem_instr_done;
+                }
+
+              switch ( (FPU_modrm >> 3) & 7 )
+                {
+                case 0:         /* fadd */
+                  clear_C1();
+                  FPU_add(&loaded_data, loaded_tag, 0, control_word);
+                  break;
+                case 1:         /* fmul */
+                  clear_C1();
+                  FPU_mul(&loaded_data, loaded_tag, 0, control_word);
+                  break;
+                case 2:         /* fcom */
+                  FPU_compare_st_data(&loaded_data, loaded_tag);
+                  break;
+                case 3:         /* fcomp */
+                  if ( !FPU_compare_st_data(&loaded_data, loaded_tag)
+                       && !unmasked )
+                    FPU_pop();
+                  break;
+                case 4:         /* fsub */
+                  clear_C1();
+                  FPU_sub(LOADED|loaded_tag, (int)&loaded_data, control_word);
+                  break;
+                case 5:         /* fsubr */
+                  clear_C1();
+                  FPU_sub(REV|LOADED|loaded_tag, (int)&loaded_data, control_word);
+                  break;
+                case 6:         /* fdiv */
+                  clear_C1();
+                  FPU_div(LOADED|loaded_tag, (int)&loaded_data, control_word);
+                  break;
+                case 7:         /* fdivr */
+                  clear_C1();
+                  if ( st0_tag == TAG_Zero )
+                    partial_status = status1;  /* Undo any denorm tag,
+                                                  zero-divide has priority. */
+                  FPU_div(REV|LOADED|loaded_tag, (int)&loaded_data, control_word);
+                  break;
+                }
+            }
+          else
+            {
+              if ( (FPU_modrm & 0x30) == 0x10 )
+                {
+                  /* The instruction is fcom or fcomp */
+                  EXCEPTION(EX_StackUnder);
+                  setcc(SW_C3 | SW_C2 | SW_C0);
+                  if ( (FPU_modrm & 0x08) && (control_word & CW_Invalid) )
+                    FPU_pop();             /* fcomp */
+                }
+              else
+                FPU_stack_underflow();
+            }
+        reg_mem_instr_done:
+          operand_address = data_sel_off;
+        }
+      else
+        {
+          if ( !(no_ip_update =
+                 FPU_load_store(((FPU_modrm & 0x38) | (byte1 & 6)) >> 1,
+                                addr_modes, data_address)) )
+            {
+              operand_address = data_sel_off;
+            }
+        }
+
+    }
+  else
+    {
+      /* None of these instructions access user memory */
+      u_char instr_index = (FPU_modrm & 0x38) | (byte1 & 7);
+
+#ifdef PECULIAR_486
+      /* This is supposed to be undefined, but a real 80486 seems
+         to do this: */
+      operand_address.offset = 0;
+      operand_address.selector = FPU_DS;
+#endif /* PECULIAR_486 */
+
+      st0_ptr = &st(0);
+      st0_tag = FPU_gettag0();
+      switch ( type_table[(int) instr_index] )
+        {
+        case _NONE_:   /* also _REGIc: _REGIn */
+          break;
+        case _REG0_:
+          if ( !NOT_EMPTY_ST0 )
+            {
+              FPU_stack_underflow();
+              goto FPU_instruction_done;
+            }
+          break;
+        case _REGIi:
+          if ( !NOT_EMPTY_ST0 || !NOT_EMPTY(FPU_rm) )
+            {
+              FPU_stack_underflow_i(FPU_rm);
+              goto FPU_instruction_done;
+            }
+          break;
+        case _REGIp:
+          if ( !NOT_EMPTY_ST0 || !NOT_EMPTY(FPU_rm) )
+            {
+              FPU_stack_underflow_pop(FPU_rm);
+              goto FPU_instruction_done;
+            }
+          break;
+        case _REGI_:
+          if ( !NOT_EMPTY_ST0 || !NOT_EMPTY(FPU_rm) )
+            {
+              FPU_stack_underflow();
+              goto FPU_instruction_done;
+            }
+          break;
+        case _PUSH_:     /* Only used by the fld st(i) instruction */
+          break;
+        case _null_:
+          FPU_illegal();
+          goto FPU_instruction_done;
+        default:
+          EXCEPTION(EX_INTERNAL|0x111);
+          goto FPU_instruction_done;
+        }
+      (*st_instr_table[(int) instr_index])();
+
+FPU_instruction_done:
+      ;
+    }
+
+  if ( ! no_ip_update )
+    instruction_address = entry_sel_off;
+
+FPU_fwait_done:
+
+#ifdef DEBUG
+  RE_ENTRANT_CHECK_OFF;
+  FPU_printall();
+  RE_ENTRANT_CHECK_ON;
+#endif /* DEBUG */
+
+  if (FPU_lookahead && !need_resched())
+    {
+      FPU_ORIG_EIP = FPU_EIP - code_base;
+      if ( valid_prefix(&byte1, (u_char __user **)&FPU_EIP,
+                        &addr_modes.override) )
+        goto do_another_FPU_instruction;
+    }
+
+  if ( addr_modes.default_mode )
+    FPU_EIP -= code_base;
+
+  RE_ENTRANT_CHECK_OFF;
+}
+
+
+/* Support for prefix bytes is not yet complete. To properly handle
+   all prefix bytes, further changes are needed in the emulator code
+   which accesses user address space. Access to separate segments is
+   important for msdos emulation. */
+static int valid_prefix(u_char *Byte, u_char __user **fpu_eip,
+                        overrides *override)
+{
+  u_char byte;
+  u_char __user *ip = *fpu_eip;
+
+  *override = (overrides) { 0, 0, PREFIX_DEFAULT };       /* defaults */
+
+  RE_ENTRANT_CHECK_OFF;
+  FPU_code_access_ok(1);
+  FPU_get_user(byte, ip);
+  RE_ENTRANT_CHECK_ON;
+
+  while ( 1 )
+    {
+      switch ( byte )
+        {
+        case ADDR_SIZE_PREFIX:
+          override->address_size = ADDR_SIZE_PREFIX;
+          goto do_next_byte;
+
+        case OP_SIZE_PREFIX:
+          override->operand_size = OP_SIZE_PREFIX;
+          goto do_next_byte;
+
+        case PREFIX_CS:
+          override->segment = PREFIX_CS_;
+          goto do_next_byte;
+        case PREFIX_ES:
+          override->segment = PREFIX_ES_;
+          goto do_next_byte;
+        case PREFIX_SS:
+          override->segment = PREFIX_SS_;
+          goto do_next_byte;
+        case PREFIX_FS:
+          override->segment = PREFIX_FS_;
+          goto do_next_byte;
+        case PREFIX_GS:
+          override->segment = PREFIX_GS_;
+          goto do_next_byte;
+        case PREFIX_DS:
+          override->segment = PREFIX_DS_;
+          goto do_next_byte;
+
+/* lock is not a valid prefix for FPU instructions,
+   let the cpu handle it to generate a SIGILL. */
+/*      case PREFIX_LOCK: */
+
+          /* rep.. prefixes have no meaning for FPU instructions */
+        case PREFIX_REPE:
+        case PREFIX_REPNE:
+
+        do_next_byte:
+          ip++;
+          RE_ENTRANT_CHECK_OFF;
+          FPU_code_access_ok(1);
+          FPU_get_user(byte, ip);
+          RE_ENTRANT_CHECK_ON;
+          break;
+        case FWAIT_OPCODE:
+          *Byte = byte;
+          return 1;
+        default:
+          if ( (byte & 0xf8) == 0xd8 )
+            {
+              *Byte = byte;
+              *fpu_eip = ip;
+              return 1;
+            }
+          else
+            {
+              /* Not a valid sequence of prefix bytes followed by
+                 an FPU instruction. */
+              *Byte = byte;  /* Needed for error message. */
+              return 0;
+            }
+        }
+    }
+}
+
+
+void math_abort(struct info * info, unsigned int signal)
+{
+        FPU_EIP = FPU_ORIG_EIP;
+        current->thread.trap_no = 16;
+        current->thread.error_code = 0;
+        send_sig(signal,current,1);
+        RE_ENTRANT_CHECK_OFF;
+        __asm__("movl %0,%%esp ; ret": :"g" (((long) info)-4));
+#ifdef PARANOID
+      printk("ERROR: wm-FPU-emu math_abort failed!\n");
+#endif /* PARANOID */
+}
+
+
+
+#define S387 ((struct i387_soft_struct *)s387)
+#define sstatus_word() \
+  ((S387->swd & ~SW_Top & 0xffff) | ((S387->ftop << SW_Top_Shift) & SW_Top))
+
+int restore_i387_soft(void *s387, struct _fpstate __user *buf)
+{
+  u_char __user *d = (u_char __user *)buf;
+  int offset, other, i, tags, regnr, tag, newtop;
+
+  RE_ENTRANT_CHECK_OFF;
+  FPU_access_ok(VERIFY_READ, d, 7*4 + 8*10);
+  if (__copy_from_user(&S387->cwd, d, 7*4))
+    return -1;
+  RE_ENTRANT_CHECK_ON;
+
+  d += 7*4;
+
+  S387->ftop = (S387->swd >> SW_Top_Shift) & 7;
+  offset = (S387->ftop & 7) * 10;
+  other = 80 - offset;
+
+  RE_ENTRANT_CHECK_OFF;
+  /* Copy all registers in stack order. */
+  if (__copy_from_user(((u_char *)&S387->st_space)+offset, d, other))
+    return -1;
+  if ( offset )
+    if (__copy_from_user((u_char *)&S387->st_space, d+other, offset))
+      return -1;
+  RE_ENTRANT_CHECK_ON;
+
+  /* The tags may need to be corrected now. */
+  tags = S387->twd;
+  newtop = S387->ftop;
+  for ( i = 0; i < 8; i++ )
+    {
+      regnr = (i+newtop) & 7;
+      if ( ((tags >> ((regnr & 7)*2)) & 3) != TAG_Empty )
+        {
+          /* The loaded data over-rides all other cases. */
+          tag = FPU_tagof((FPU_REG *)((u_char *)S387->st_space + 10*regnr));
+          tags &= ~(3 << (regnr*2));
+          tags |= (tag & 3) << (regnr*2);
+        }
+    }
+  S387->twd = tags;
+
+  return 0;
+}
+
+
+int save_i387_soft(void *s387, struct _fpstate __user * buf)
+{
+  u_char __user *d = (u_char __user *)buf;
+  int offset = (S387->ftop & 7) * 10, other = 80 - offset;
+
+  RE_ENTRANT_CHECK_OFF;
+  FPU_access_ok(VERIFY_WRITE, d, 7*4 + 8*10);
+#ifdef PECULIAR_486
+  S387->cwd &= ~0xe080;
+  /* An 80486 sets nearly all of the reserved bits to 1. */
+  S387->cwd |= 0xffff0040;
+  S387->swd = sstatus_word() | 0xffff0000;
+  S387->twd |= 0xffff0000;
+  S387->fcs &= ~0xf8000000;
+  S387->fos |= 0xffff0000;
+#endif /* PECULIAR_486 */
+  __copy_to_user(d, &S387->cwd, 7*4);
+  RE_ENTRANT_CHECK_ON;
+
+  d += 7*4;
+
+  RE_ENTRANT_CHECK_OFF;
+  /* Copy all registers in stack order. */
+  if (__copy_to_user(d, ((u_char *)&S387->st_space)+offset, other))
+    return -1;
+  if ( offset )
+    if (__copy_to_user(d+other, (u_char *)&S387->st_space, offset))
+      return -1
+  RE_ENTRANT_CHECK_ON;
+
+  return 1;
+}
diff --git a/arch/i386/math-emu/fpu_etc.c b/arch/i386/math-emu/fpu_etc.c
new file mode 100644
index 000000000000..e3b5d465587f
--- /dev/null
+++ b/arch/i386/math-emu/fpu_etc.c
@@ -0,0 +1,143 @@
+/*---------------------------------------------------------------------------+
+ |  fpu_etc.c                                                                |
+ |                                                                           |
+ | Implement a few FPU instructions.                                         |
+ |                                                                           |
+ | Copyright (C) 1992,1993,1994,1997                                         |
+ |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
+ |                       Australia.  E-mail   billm@suburbia.net             |
+ |                                                                           |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+#include "fpu_system.h"
+#include "exception.h"
+#include "fpu_emu.h"
+#include "status_w.h"
+#include "reg_constant.h"
+
+
+static void fchs(FPU_REG *st0_ptr, u_char st0tag)
+{
+  if ( st0tag ^ TAG_Empty )
+    {
+      signbyte(st0_ptr) ^= SIGN_NEG;
+      clear_C1();
+    }
+  else
+    FPU_stack_underflow();
+}
+
+
+static void fabs(FPU_REG *st0_ptr, u_char st0tag)
+{
+  if ( st0tag ^ TAG_Empty )
+    {
+      setpositive(st0_ptr);
+      clear_C1();
+    }
+  else
+    FPU_stack_underflow();
+}
+
+
+static void ftst_(FPU_REG *st0_ptr, u_char st0tag)
+{
+  switch (st0tag)
+    {
+    case TAG_Zero:
+      setcc(SW_C3);
+      break;
+    case TAG_Valid:
+      if (getsign(st0_ptr) == SIGN_POS)
+        setcc(0);
+      else
+        setcc(SW_C0);
+      break;
+    case TAG_Special:
+      switch ( FPU_Special(st0_ptr) )
+        {
+        case TW_Denormal:
+          if (getsign(st0_ptr) == SIGN_POS)
+            setcc(0);
+          else
+            setcc(SW_C0);
+          if ( denormal_operand() < 0 )
+            {
+#ifdef PECULIAR_486
+              /* This is weird! */
+              if (getsign(st0_ptr) == SIGN_POS)
+                setcc(SW_C3);
+#endif /* PECULIAR_486 */
+              return;
+            }
+          break;
+        case TW_NaN:
+          setcc(SW_C0|SW_C2|SW_C3);   /* Operand is not comparable */ 
+          EXCEPTION(EX_Invalid);
+          break;
+        case TW_Infinity:
+          if (getsign(st0_ptr) == SIGN_POS)
+            setcc(0);
+          else
+            setcc(SW_C0);
+          break;
+        default:
+          setcc(SW_C0|SW_C2|SW_C3);   /* Operand is not comparable */ 
+          EXCEPTION(EX_INTERNAL|0x14);
+          break;
+        }
+      break;
+    case TAG_Empty:
+      setcc(SW_C0|SW_C2|SW_C3);
+      EXCEPTION(EX_StackUnder);
+      break;
+    }
+}
+
+
+static void fxam(FPU_REG *st0_ptr, u_char st0tag)
+{
+  int c = 0;
+  switch (st0tag)
+    {
+    case TAG_Empty:
+      c = SW_C3|SW_C0;
+      break;
+    case TAG_Zero:
+      c = SW_C3;
+      break;
+    case TAG_Valid:
+      c = SW_C2;
+      break;
+    case TAG_Special:
+      switch ( FPU_Special(st0_ptr) )
+        {
+        case TW_Denormal:
+          c = SW_C2|SW_C3;  /* Denormal */
+          break;
+        case TW_NaN:
+          /* We also use NaN for unsupported types. */
+          if ( (st0_ptr->sigh & 0x80000000) && (exponent(st0_ptr) == EXP_OVER) )
+            c = SW_C0;
+          break;
+        case TW_Infinity:
+          c = SW_C2|SW_C0;
+          break;
+        }
+    }
+  if ( getsign(st0_ptr) == SIGN_NEG )
+    c |= SW_C1;
+  setcc(c);
+}
+
+
+static FUNC_ST0 const fp_etc_table[] = {
+  fchs, fabs, (FUNC_ST0)FPU_illegal, (FUNC_ST0)FPU_illegal,
+  ftst_, fxam, (FUNC_ST0)FPU_illegal, (FUNC_ST0)FPU_illegal
+};
+
+void FPU_etc(void)
+{
+  (fp_etc_table[FPU_rm])(&st(0), FPU_gettag0());
+}
diff --git a/arch/i386/math-emu/fpu_proto.h b/arch/i386/math-emu/fpu_proto.h
new file mode 100644
index 000000000000..37a8a7fe7e2b
--- /dev/null
+++ b/arch/i386/math-emu/fpu_proto.h
@@ -0,0 +1,140 @@
+#ifndef _FPU_PROTO_H
+#define _FPU_PROTO_H
+
+/* errors.c */
+extern void FPU_illegal(void);
+extern void FPU_printall(void);
+asmlinkage void FPU_exception(int n);
+extern int real_1op_NaN(FPU_REG *a);
+extern int real_2op_NaN(FPU_REG const *b, u_char tagb, int deststnr,
+                        FPU_REG const *defaultNaN);
+asmlinkage int arith_invalid(int deststnr);
+asmlinkage int FPU_divide_by_zero(int deststnr, u_char sign);
+extern int set_precision_flag(int flags);
+asmlinkage void set_precision_flag_up(void);
+asmlinkage void set_precision_flag_down(void);
+asmlinkage int denormal_operand(void);
+asmlinkage int arith_overflow(FPU_REG *dest);
+asmlinkage int arith_underflow(FPU_REG *dest);
+extern void FPU_stack_overflow(void);
+extern void FPU_stack_underflow(void);
+extern void FPU_stack_underflow_i(int i);
+extern void FPU_stack_underflow_pop(int i);
+/* fpu_arith.c */
+extern void fadd__(void);
+extern void fmul__(void);
+extern void fsub__(void);
+extern void fsubr_(void);
+extern void fdiv__(void);
+extern void fdivr_(void);
+extern void fadd_i(void);
+extern void fmul_i(void);
+extern void fsubri(void);
+extern void fsub_i(void);
+extern void fdivri(void);
+extern void fdiv_i(void);
+extern void faddp_(void);
+extern void fmulp_(void);
+extern void fsubrp(void);
+extern void fsubp_(void);
+extern void fdivrp(void);
+extern void fdivp_(void);
+/* fpu_aux.c */
+extern void finit(void);
+extern void finit_(void);
+extern void fstsw_(void);
+extern void fp_nop(void);
+extern void fld_i_(void);
+extern void fxch_i(void);
+extern void ffree_(void);
+extern void ffreep(void);
+extern void fst_i_(void);
+extern void fstp_i(void);
+/* fpu_entry.c */
+asmlinkage extern void math_emulate(long arg);
+extern void math_abort(struct info *info, unsigned int signal);
+/* fpu_etc.c */
+extern void FPU_etc(void);
+/* fpu_tags.c */
+extern int FPU_gettag0(void);
+extern int FPU_gettagi(int stnr);
+extern int FPU_gettag(int regnr);
+extern void FPU_settag0(int tag);
+extern void FPU_settagi(int stnr, int tag);
+extern void FPU_settag(int regnr, int tag);
+extern int FPU_Special(FPU_REG const *ptr);
+extern int isNaN(FPU_REG const *ptr);
+extern void FPU_pop(void);
+extern int FPU_empty_i(int stnr);
+extern int FPU_stackoverflow(FPU_REG **st_new_ptr);
+extern void FPU_copy_to_regi(FPU_REG const *r, u_char tag, int stnr);
+extern void FPU_copy_to_reg1(FPU_REG const *r, u_char tag);
+extern void FPU_copy_to_reg0(FPU_REG const *r, u_char tag);
+/* fpu_trig.c */
+extern void FPU_triga(void);
+extern void FPU_trigb(void);
+/* get_address.c */
+extern void __user *FPU_get_address(u_char FPU_modrm, unsigned long *fpu_eip,
+                         struct address *addr, fpu_addr_modes addr_modes);
+extern void __user *FPU_get_address_16(u_char FPU_modrm, unsigned long *fpu_eip,
+                            struct address *addr, fpu_addr_modes addr_modes);
+/* load_store.c */
+extern int FPU_load_store(u_char type, fpu_addr_modes addr_modes,
+                            void __user *data_address);
+/* poly_2xm1.c */
+extern int poly_2xm1(u_char sign, FPU_REG *arg, FPU_REG *result);
+/* poly_atan.c */
+extern void poly_atan(FPU_REG *st0_ptr, u_char st0_tag, FPU_REG *st1_ptr,
+                      u_char st1_tag);
+/* poly_l2.c */
+extern void poly_l2(FPU_REG *st0_ptr, FPU_REG *st1_ptr, u_char st1_sign);
+extern int poly_l2p1(u_char s0, u_char s1, FPU_REG *r0, FPU_REG *r1,
+                     FPU_REG *d);
+/* poly_sin.c */
+extern void poly_sine(FPU_REG *st0_ptr);
+extern void poly_cos(FPU_REG *st0_ptr);
+/* poly_tan.c */
+extern void poly_tan(FPU_REG *st0_ptr);
+/* reg_add_sub.c */
+extern int FPU_add(FPU_REG const *b, u_char tagb, int destrnr, int control_w);
+extern int FPU_sub(int flags, int rm, int control_w);
+/* reg_compare.c */
+extern int FPU_compare_st_data(FPU_REG const *loaded_data, u_char loaded_tag);
+extern void fcom_st(void);
+extern void fcompst(void);
+extern void fcompp(void);
+extern void fucom_(void);
+extern void fucomp(void);
+extern void fucompp(void);
+/* reg_constant.c */
+extern void fconst(void);
+/* reg_ld_str.c */
+extern int FPU_load_extended(long double __user *s, int stnr);
+extern int FPU_load_double(double __user *dfloat, FPU_REG *loaded_data);
+extern int FPU_load_single(float __user *single, FPU_REG *loaded_data);
+extern int FPU_load_int64(long long __user *_s);
+extern int FPU_load_int32(long __user *_s, FPU_REG *loaded_data);
+extern int FPU_load_int16(short __user *_s, FPU_REG *loaded_data);
+extern int FPU_load_bcd(u_char __user *s);
+extern int FPU_store_extended(FPU_REG *st0_ptr, u_char st0_tag,
+                              long double __user *d);
+extern int FPU_store_double(FPU_REG *st0_ptr, u_char st0_tag, double __user *dfloat);
+extern int FPU_store_single(FPU_REG *st0_ptr, u_char st0_tag, float __user *single);
+extern int FPU_store_int64(FPU_REG *st0_ptr, u_char st0_tag, long long __user *d);
+extern int FPU_store_int32(FPU_REG *st0_ptr, u_char st0_tag, long __user *d);
+extern int FPU_store_int16(FPU_REG *st0_ptr, u_char st0_tag, short __user *d);
+extern int FPU_store_bcd(FPU_REG *st0_ptr, u_char st0_tag, u_char __user *d);
+extern int FPU_round_to_int(FPU_REG *r, u_char tag);
+extern u_char __user *fldenv(fpu_addr_modes addr_modes, u_char __user *s);
+extern void frstor(fpu_addr_modes addr_modes, u_char __user *data_address);
+extern u_char __user *fstenv(fpu_addr_modes addr_modes, u_char __user *d);
+extern void fsave(fpu_addr_modes addr_modes, u_char __user *data_address);
+extern int FPU_tagof(FPU_REG *ptr);
+/* reg_mul.c */
+extern int FPU_mul(FPU_REG const *b, u_char tagb, int deststnr, int control_w);
+
+extern int FPU_div(int flags, int regrm, int control_w);
+/* reg_convert.c */
+extern int FPU_to_exp16(FPU_REG const *a, FPU_REG *x);
+#endif /* _FPU_PROTO_H */
+
diff --git a/arch/i386/math-emu/fpu_system.h b/arch/i386/math-emu/fpu_system.h
new file mode 100644
index 000000000000..bf26341c8bde
--- /dev/null
+++ b/arch/i386/math-emu/fpu_system.h
@@ -0,0 +1,89 @@
+/*---------------------------------------------------------------------------+
+ |  fpu_system.h                                                             |
+ |                                                                           |
+ | Copyright (C) 1992,1994,1997                                              |
+ |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
+ |                       Australia.  E-mail   billm@suburbia.net             |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+#ifndef _FPU_SYSTEM_H
+#define _FPU_SYSTEM_H
+
+/* system dependent definitions */
+
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+
+/* This sets the pointer FPU_info to point to the argument part
+   of the stack frame of math_emulate() */
+#define SETUP_DATA_AREA(arg)    FPU_info = (struct info *) &arg
+
+/* s is always from a cpu register, and the cpu does bounds checking
+ * during register load --> no further bounds checks needed */
+#define LDT_DESCRIPTOR(s)       (((struct desc_struct *)current->mm->context.ldt)[(s) >> 3])
+#define SEG_D_SIZE(x)           ((x).b & (3 << 21))
+#define SEG_G_BIT(x)            ((x).b & (1 << 23))
+#define SEG_GRANULARITY(x)      (((x).b & (1 << 23)) ? 4096 : 1)
+#define SEG_286_MODE(x)         ((x).b & ( 0xff000000 | 0xf0000 | (1 << 23)))
+#define SEG_BASE_ADDR(s)        (((s).b & 0xff000000) \
+                                 | (((s).b & 0xff) << 16) | ((s).a >> 16))
+#define SEG_LIMIT(s)            (((s).b & 0xff0000) | ((s).a & 0xffff))
+#define SEG_EXECUTE_ONLY(s)     (((s).b & ((1 << 11) | (1 << 9))) == (1 << 11))
+#define SEG_WRITE_PERM(s)       (((s).b & ((1 << 11) | (1 << 9))) == (1 << 9))
+#define SEG_EXPAND_DOWN(s)      (((s).b & ((1 << 11) | (1 << 10))) \
+                                 == (1 << 10))
+
+#define I387                    (current->thread.i387)
+#define FPU_info                (I387.soft.info)
+
+#define FPU_CS                  (*(unsigned short *) &(FPU_info->___cs))
+#define FPU_SS                  (*(unsigned short *) &(FPU_info->___ss))
+#define FPU_DS                  (*(unsigned short *) &(FPU_info->___ds))
+#define FPU_EAX                 (FPU_info->___eax)
+#define FPU_EFLAGS              (FPU_info->___eflags)
+#define FPU_EIP                 (FPU_info->___eip)
+#define FPU_ORIG_EIP            (FPU_info->___orig_eip)
+
+#define FPU_lookahead           (I387.soft.lookahead)
+
+/* nz if ip_offset and cs_selector are not to be set for the current
+   instruction. */
+#define no_ip_update            (*(u_char *)&(I387.soft.no_update))
+#define FPU_rm                  (*(u_char *)&(I387.soft.rm))
+
+/* Number of bytes of data which can be legally accessed by the current
+   instruction. This only needs to hold a number <= 108, so a byte will do. */
+#define access_limit            (*(u_char *)&(I387.soft.alimit))
+
+#define partial_status          (I387.soft.swd)
+#define control_word            (I387.soft.cwd)
+#define fpu_tag_word            (I387.soft.twd)
+#define registers               (I387.soft.st_space)
+#define top                     (I387.soft.ftop)
+
+#define instruction_address     (*(struct address *)&I387.soft.fip)
+#define operand_address         (*(struct address *)&I387.soft.foo)
+
+#define FPU_access_ok(x,y,z)    if ( !access_ok(x,y,z) ) \
+                                math_abort(FPU_info,SIGSEGV)
+
+#undef FPU_IGNORE_CODE_SEGV
+#ifdef FPU_IGNORE_CODE_SEGV
+/* access_ok() is very expensive, and causes the emulator to run
+   about 20% slower if applied to the code. Anyway, errors due to bad
+   code addresses should be much rarer than errors due to bad data
+   addresses. */
+#define FPU_code_access_ok(z)
+#else
+/* A simpler test than access_ok() can probably be done for
+   FPU_code_access_ok() because the only possible error is to step
+   past the upper boundary of a legal code area. */
+#define FPU_code_access_ok(z) FPU_access_ok(VERIFY_READ,(void __user *)FPU_EIP,z)
+#endif
+
+#define FPU_get_user(x,y)       get_user((x),(y))
+#define FPU_put_user(x,y)       put_user((x),(y))
+
+#endif
diff --git a/arch/i386/math-emu/fpu_tags.c b/arch/i386/math-emu/fpu_tags.c
new file mode 100644
index 000000000000..cb436fe20e4c
--- /dev/null
+++ b/arch/i386/math-emu/fpu_tags.c
@@ -0,0 +1,127 @@
+/*---------------------------------------------------------------------------+
+ |  fpu_tags.c                                                               |
+ |                                                                           |
+ |  Set FPU register tags.                                                   |
+ |                                                                           |
+ | Copyright (C) 1997                                                        |
+ |                  W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia |
+ |                  E-mail   billm@jacobi.maths.monash.edu.au                |
+ |                                                                           |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+#include "fpu_emu.h"
+#include "fpu_system.h"
+#include "exception.h"
+
+
+void FPU_pop(void)
+{
+  fpu_tag_word |= 3 << ((top & 7)*2);
+  top++;
+}
+
+
+int FPU_gettag0(void)
+{
+  return (fpu_tag_word >> ((top & 7)*2)) & 3;
+}
+
+
+int FPU_gettagi(int stnr)
+{
+  return (fpu_tag_word >> (((top+stnr) & 7)*2)) & 3;
+}
+
+
+int FPU_gettag(int regnr)
+{
+  return (fpu_tag_word >> ((regnr & 7)*2)) & 3;
+}
+
+
+void FPU_settag0(int tag)
+{
+  int regnr = top;
+  regnr &= 7;
+  fpu_tag_word &= ~(3 << (regnr*2));
+  fpu_tag_word |= (tag & 3) << (regnr*2);
+}
+
+
+void FPU_settagi(int stnr, int tag)
+{
+  int regnr = stnr+top;
+  regnr &= 7;
+  fpu_tag_word &= ~(3 << (regnr*2));
+  fpu_tag_word |= (tag & 3) << (regnr*2);
+}
+
+
+void FPU_settag(int regnr, int tag)
+{
+  regnr &= 7;
+  fpu_tag_word &= ~(3 << (regnr*2));
+  fpu_tag_word |= (tag & 3) << (regnr*2);
+}
+
+
+int FPU_Special(FPU_REG const *ptr)
+{
+  int exp = exponent(ptr);
+
+  if ( exp == EXP_BIAS+EXP_UNDER )
+    return TW_Denormal;
+  else if ( exp != EXP_BIAS+EXP_OVER )
+    return TW_NaN;
+  else if ( (ptr->sigh == 0x80000000) && (ptr->sigl == 0) )
+    return TW_Infinity;
+  return TW_NaN;
+}
+
+
+int isNaN(FPU_REG const *ptr)
+{
+  return ( (exponent(ptr) == EXP_BIAS+EXP_OVER)
+           && !((ptr->sigh == 0x80000000) && (ptr->sigl == 0)) );
+}
+
+
+int FPU_empty_i(int stnr)
+{
+  int regnr = (top+stnr) & 7;
+
+  return ((fpu_tag_word >> (regnr*2)) & 3) == TAG_Empty;
+}
+
+
+int FPU_stackoverflow(FPU_REG **st_new_ptr)
+{
+  *st_new_ptr = &st(-1);
+
+  return ((fpu_tag_word >> (((top - 1) & 7)*2)) & 3) != TAG_Empty;
+}
+
+
+void FPU_copy_to_regi(FPU_REG const *r, u_char tag, int stnr)
+{
+  reg_copy(r, &st(stnr));
+  FPU_settagi(stnr, tag);
+}
+
+void FPU_copy_to_reg1(FPU_REG const *r, u_char tag)
+{
+  reg_copy(r, &st(1));
+  FPU_settagi(1, tag);
+}
+
+void FPU_copy_to_reg0(FPU_REG const *r, u_char tag)
+{
+  int regnr = top;
+  regnr &= 7;
+
+  reg_copy(r, &st(0));
+
+  fpu_tag_word &= ~(3 << (regnr*2));
+  fpu_tag_word |= (tag & 3) << (regnr*2);
+}
diff --git a/arch/i386/math-emu/fpu_trig.c b/arch/i386/math-emu/fpu_trig.c
new file mode 100644
index 000000000000..403cbde1d425
--- /dev/null
+++ b/arch/i386/math-emu/fpu_trig.c
@@ -0,0 +1,1845 @@
+/*---------------------------------------------------------------------------+
+ |  fpu_trig.c                                                               |
+ |                                                                           |
+ | Implementation of the FPU "transcendental" functions.                     |
+ |                                                                           |
+ | Copyright (C) 1992,1993,1994,1997,1999                                    |
+ |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
+ |                       Australia.  E-mail   billm@melbpc.org.au            |
+ |                                                                           |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+#include "fpu_system.h"
+#include "exception.h"
+#include "fpu_emu.h"
+#include "status_w.h"
+#include "control_w.h"
+#include "reg_constant.h"       
+
+static void rem_kernel(unsigned long long st0, unsigned long long *y,
+                       unsigned long long st1,
+                       unsigned long long q, int n);
+
+#define BETTER_THAN_486
+
+#define FCOS  4
+
+/* Used only by fptan, fsin, fcos, and fsincos. */
+/* This routine produces very accurate results, similar to
+   using a value of pi with more than 128 bits precision. */
+/* Limited measurements show no results worse than 64 bit precision
+   except for the results for arguments close to 2^63, where the
+   precision of the result sometimes degrades to about 63.9 bits */
+static int trig_arg(FPU_REG *st0_ptr, int even)
+{
+  FPU_REG tmp;
+  u_char tmptag;
+  unsigned long long q;
+  int old_cw = control_word, saved_status = partial_status;
+  int tag, st0_tag = TAG_Valid;
+
+  if ( exponent(st0_ptr) >= 63 )
+    {
+      partial_status |= SW_C2;     /* Reduction incomplete. */
+      return -1;
+    }
+
+  control_word &= ~CW_RC;
+  control_word |= RC_CHOP;
+
+  setpositive(st0_ptr);
+  tag = FPU_u_div(st0_ptr, &CONST_PI2, &tmp, PR_64_BITS | RC_CHOP | 0x3f,
+                  SIGN_POS);
+
+  FPU_round_to_int(&tmp, tag);  /* Fortunately, this can't overflow
+                                   to 2^64 */
+  q = significand(&tmp);
+  if ( q )
+    {
+      rem_kernel(significand(st0_ptr),
+                 &significand(&tmp),
+                 significand(&CONST_PI2),
+                 q, exponent(st0_ptr) - exponent(&CONST_PI2));
+      setexponent16(&tmp, exponent(&CONST_PI2));
+      st0_tag = FPU_normalize(&tmp);
+      FPU_copy_to_reg0(&tmp, st0_tag);
+    }
+
+  if ( (even && !(q & 1)) || (!even && (q & 1)) )
+    {
+      st0_tag = FPU_sub(REV|LOADED|TAG_Valid, (int)&CONST_PI2, FULL_PRECISION);
+
+#ifdef BETTER_THAN_486
+      /* So far, the results are exact but based upon a 64 bit
+         precision approximation to pi/2. The technique used
+         now is equivalent to using an approximation to pi/2 which
+         is accurate to about 128 bits. */
+      if ( (exponent(st0_ptr) <= exponent(&CONST_PI2extra) + 64) || (q > 1) )
+        {
+          /* This code gives the effect of having pi/2 to better than
+             128 bits precision. */
+
+          significand(&tmp) = q + 1;
+          setexponent16(&tmp, 63);
+          FPU_normalize(&tmp);
+          tmptag =
+            FPU_u_mul(&CONST_PI2extra, &tmp, &tmp, FULL_PRECISION, SIGN_POS,
+                      exponent(&CONST_PI2extra) + exponent(&tmp));
+          setsign(&tmp, getsign(&CONST_PI2extra));
+          st0_tag = FPU_add(&tmp, tmptag, 0, FULL_PRECISION);
+          if ( signnegative(st0_ptr) )
+            {
+              /* CONST_PI2extra is negative, so the result of the addition
+                 can be negative. This means that the argument is actually
+                 in a different quadrant. The correction is always < pi/2,
+                 so it can't overflow into yet another quadrant. */
+              setpositive(st0_ptr);
+              q++;
+            }
+        }
+#endif /* BETTER_THAN_486 */
+    }
+#ifdef BETTER_THAN_486
+  else
+    {
+      /* So far, the results are exact but based upon a 64 bit
+         precision approximation to pi/2. The technique used
+         now is equivalent to using an approximation to pi/2 which
+         is accurate to about 128 bits. */
+      if ( ((q > 0) && (exponent(st0_ptr) <= exponent(&CONST_PI2extra) + 64))
+           || (q > 1) )
+        {
+          /* This code gives the effect of having p/2 to better than
+             128 bits precision. */
+
+          significand(&tmp) = q;
+          setexponent16(&tmp, 63);
+          FPU_normalize(&tmp);         /* This must return TAG_Valid */
+          tmptag = FPU_u_mul(&CONST_PI2extra, &tmp, &tmp, FULL_PRECISION,
+                             SIGN_POS,
+                             exponent(&CONST_PI2extra) + exponent(&tmp));
+          setsign(&tmp, getsign(&CONST_PI2extra));
+          st0_tag = FPU_sub(LOADED|(tmptag & 0x0f), (int)&tmp,
+                            FULL_PRECISION);
+          if ( (exponent(st0_ptr) == exponent(&CONST_PI2)) &&
+              ((st0_ptr->sigh > CONST_PI2.sigh)
+               || ((st0_ptr->sigh == CONST_PI2.sigh)
+                   && (st0_ptr->sigl > CONST_PI2.sigl))) )
+            {
+              /* CONST_PI2extra is negative, so the result of the
+                 subtraction can be larger than pi/2. This means
+                 that the argument is actually in a different quadrant.
+                 The correction is always < pi/2, so it can't overflow
+                 into yet another quadrant. */
+              st0_tag = FPU_sub(REV|LOADED|TAG_Valid, (int)&CONST_PI2,
+                                FULL_PRECISION);
+              q++;
+            }
+        }
+    }
+#endif /* BETTER_THAN_486 */
+
+  FPU_settag0(st0_tag);
+  control_word = old_cw;
+  partial_status = saved_status & ~SW_C2;     /* Reduction complete. */
+
+  return (q & 3) | even;
+}
+
+
+/* Convert a long to register */
+static void convert_l2reg(long const *arg, int deststnr)
+{
+  int tag;
+  long num = *arg;
+  u_char sign;
+  FPU_REG *dest = &st(deststnr);
+
+  if (num == 0)
+    {
+      FPU_copy_to_regi(&CONST_Z, TAG_Zero, deststnr);
+      return;
+    }
+
+  if (num > 0)
+    { sign = SIGN_POS; }
+  else
+    { num = -num; sign = SIGN_NEG; }
+
+  dest->sigh = num;
+  dest->sigl = 0;
+  setexponent16(dest, 31);
+  tag = FPU_normalize(dest);
+  FPU_settagi(deststnr, tag);
+  setsign(dest, sign);
+  return;
+}
+
+
+static void single_arg_error(FPU_REG *st0_ptr, u_char st0_tag)
+{
+  if ( st0_tag == TAG_Empty )
+    FPU_stack_underflow();  /* Puts a QNaN in st(0) */
+  else if ( st0_tag == TW_NaN )
+    real_1op_NaN(st0_ptr);       /* return with a NaN in st(0) */
+#ifdef PARANOID
+  else
+    EXCEPTION(EX_INTERNAL|0x0112);
+#endif /* PARANOID */
+}
+
+
+static void single_arg_2_error(FPU_REG *st0_ptr, u_char st0_tag)
+{
+  int isNaN;
+
+  switch ( st0_tag )
+    {
+    case TW_NaN:
+      isNaN = (exponent(st0_ptr) == EXP_OVER) && (st0_ptr->sigh & 0x80000000);
+      if ( isNaN && !(st0_ptr->sigh & 0x40000000) )   /* Signaling ? */
+        {
+          EXCEPTION(EX_Invalid);
+          if ( control_word & CW_Invalid )
+            {
+              /* The masked response */
+              /* Convert to a QNaN */
+              st0_ptr->sigh |= 0x40000000;
+              push();
+              FPU_copy_to_reg0(st0_ptr, TAG_Special);
+            }
+        }
+      else if ( isNaN )
+        {
+          /* A QNaN */
+          push();
+          FPU_copy_to_reg0(st0_ptr, TAG_Special);
+        }
+      else
+        {
+          /* pseudoNaN or other unsupported */
+          EXCEPTION(EX_Invalid);
+          if ( control_word & CW_Invalid )
+            {
+              /* The masked response */
+              FPU_copy_to_reg0(&CONST_QNaN, TAG_Special);
+              push();
+              FPU_copy_to_reg0(&CONST_QNaN, TAG_Special);
+            }
+        }
+      break;              /* return with a NaN in st(0) */
+#ifdef PARANOID
+    default:
+      EXCEPTION(EX_INTERNAL|0x0112);
+#endif /* PARANOID */
+    }
+}
+
+
+/*---------------------------------------------------------------------------*/
+
+static void f2xm1(FPU_REG *st0_ptr, u_char tag)
+{
+  FPU_REG a;
+
+  clear_C1();
+
+  if ( tag == TAG_Valid )
+    {
+      /* For an 80486 FPU, the result is undefined if the arg is >= 1.0 */
+      if ( exponent(st0_ptr) < 0 )
+        {
+        denormal_arg:
+
+          FPU_to_exp16(st0_ptr, &a);
+
+          /* poly_2xm1(x) requires 0 < st(0) < 1. */
+          poly_2xm1(getsign(st0_ptr), &a, st0_ptr);
+        }
+      set_precision_flag_up();   /* 80486 appears to always do this */
+      return;
+    }
+
+  if ( tag == TAG_Zero )
+    return;
+
+  if ( tag == TAG_Special )
+    tag = FPU_Special(st0_ptr);
+
+  switch ( tag )
+    {
+    case TW_Denormal:
+      if ( denormal_operand() < 0 )
+        return;
+      goto denormal_arg;
+    case TW_Infinity:
+      if ( signnegative(st0_ptr) )
+        {
+          /* -infinity gives -1 (p16-10) */
+          FPU_copy_to_reg0(&CONST_1, TAG_Valid);
+          setnegative(st0_ptr);
+        }
+      return;
+    default:
+      single_arg_error(st0_ptr, tag);
+    }
+}
+
+
+static void fptan(FPU_REG *st0_ptr, u_char st0_tag)
+{
+  FPU_REG *st_new_ptr;
+  int q;
+  u_char arg_sign = getsign(st0_ptr);
+
+  /* Stack underflow has higher priority */
+  if ( st0_tag == TAG_Empty )
+    {
+      FPU_stack_underflow();  /* Puts a QNaN in st(0) */
+      if ( control_word & CW_Invalid )
+        {
+          st_new_ptr = &st(-1);
+          push();
+          FPU_stack_underflow();  /* Puts a QNaN in the new st(0) */
+        }
+      return;
+    }
+
+  if ( STACK_OVERFLOW )
+    { FPU_stack_overflow(); return; }
+
+  if ( st0_tag == TAG_Valid )
+    {
+      if ( exponent(st0_ptr) > -40 )
+        {
+          if ( (q = trig_arg(st0_ptr, 0)) == -1 )
+            {
+              /* Operand is out of range */
+              return;
+            }
+
+          poly_tan(st0_ptr);
+          setsign(st0_ptr, (q & 1) ^ (arg_sign != 0));
+          set_precision_flag_up();  /* We do not really know if up or down */
+        }
+      else
+        {
+          /* For a small arg, the result == the argument */
+          /* Underflow may happen */
+
+        denormal_arg:
+
+          FPU_to_exp16(st0_ptr, st0_ptr);
+      
+          st0_tag = FPU_round(st0_ptr, 1, 0, FULL_PRECISION, arg_sign);
+          FPU_settag0(st0_tag);
+        }
+      push();
+      FPU_copy_to_reg0(&CONST_1, TAG_Valid);
+      return;
+    }
+
+  if ( st0_tag == TAG_Zero )
+    {
+      push();
+      FPU_copy_to_reg0(&CONST_1, TAG_Valid);
+      setcc(0);
+      return;
+    }
+
+  if ( st0_tag == TAG_Special )
+    st0_tag = FPU_Special(st0_ptr);
+
+  if ( st0_tag == TW_Denormal )
+    {
+      if ( denormal_operand() < 0 )
+        return;
+
+      goto denormal_arg;
+    }
+
+  if ( st0_tag == TW_Infinity )
+    {
+      /* The 80486 treats infinity as an invalid operand */
+      if ( arith_invalid(0) >= 0 )
+        {
+          st_new_ptr = &st(-1);
+          push();
+          arith_invalid(0);
+        }
+      return;
+    }
+
+  single_arg_2_error(st0_ptr, st0_tag);
+}
+
+
+static void fxtract(FPU_REG *st0_ptr, u_char st0_tag)
+{
+  FPU_REG *st_new_ptr;
+  u_char sign;
+  register FPU_REG *st1_ptr = st0_ptr;  /* anticipate */
+
+  if ( STACK_OVERFLOW )
+    {  FPU_stack_overflow(); return; }
+
+  clear_C1();
+
+  if ( st0_tag == TAG_Valid )
+    {
+      long e;
+
+      push();
+      sign = getsign(st1_ptr);
+      reg_copy(st1_ptr, st_new_ptr);
+      setexponent16(st_new_ptr, exponent(st_new_ptr));
+
+    denormal_arg:
+
+      e = exponent16(st_new_ptr);
+      convert_l2reg(&e, 1);
+      setexponentpos(st_new_ptr, 0);
+      setsign(st_new_ptr, sign);
+      FPU_settag0(TAG_Valid);       /* Needed if arg was a denormal */
+      return;
+    }
+  else if ( st0_tag == TAG_Zero )
+    {
+      sign = getsign(st0_ptr);
+
+      if ( FPU_divide_by_zero(0, SIGN_NEG) < 0 )
+        return;
+
+      push();
+      FPU_copy_to_reg0(&CONST_Z, TAG_Zero);
+      setsign(st_new_ptr, sign);
+      return;
+    }
+
+  if ( st0_tag == TAG_Special )
+    st0_tag = FPU_Special(st0_ptr);
+
+  if ( st0_tag == TW_Denormal )
+    {
+      if (denormal_operand() < 0 )
+        return;
+
+      push();
+      sign = getsign(st1_ptr);
+      FPU_to_exp16(st1_ptr, st_new_ptr);
+      goto denormal_arg;
+    }
+  else if ( st0_tag == TW_Infinity )
+    {
+      sign = getsign(st0_ptr);
+      setpositive(st0_ptr);
+      push();
+      FPU_copy_to_reg0(&CONST_INF, TAG_Special);
+      setsign(st_new_ptr, sign);
+      return;
+    }
+  else if ( st0_tag == TW_NaN )
+    {
+      if ( real_1op_NaN(st0_ptr) < 0 )
+        return;
+
+      push();
+      FPU_copy_to_reg0(st0_ptr, TAG_Special);
+      return;
+    }
+  else if ( st0_tag == TAG_Empty )
+    {
+      /* Is this the correct behaviour? */
+      if ( control_word & EX_Invalid )
+        {
+          FPU_stack_underflow();
+          push();
+          FPU_stack_underflow();
+        }
+      else
+        EXCEPTION(EX_StackUnder);
+    }
+#ifdef PARANOID
+  else
+    EXCEPTION(EX_INTERNAL | 0x119);
+#endif /* PARANOID */
+}
+
+
+static void fdecstp(void)
+{
+  clear_C1();
+  top--;
+}
+
+static void fincstp(void)
+{
+  clear_C1();
+  top++;
+}
+
+
+static void fsqrt_(FPU_REG *st0_ptr, u_char st0_tag)
+{
+  int expon;
+
+  clear_C1();
+
+  if ( st0_tag == TAG_Valid )
+    {
+      u_char tag;
+      
+      if (signnegative(st0_ptr))
+        {
+          arith_invalid(0);  /* sqrt(negative) is invalid */
+          return;
+        }
+
+      /* make st(0) in  [1.0 .. 4.0) */
+      expon = exponent(st0_ptr);
+
+    denormal_arg:
+
+      setexponent16(st0_ptr, (expon & 1));
+
+      /* Do the computation, the sign of the result will be positive. */
+      tag = wm_sqrt(st0_ptr, 0, 0, control_word, SIGN_POS);
+      addexponent(st0_ptr, expon >> 1);
+      FPU_settag0(tag);
+      return;
+    }
+
+  if ( st0_tag == TAG_Zero )
+    return;
+
+  if ( st0_tag == TAG_Special )
+    st0_tag = FPU_Special(st0_ptr);
+
+  if ( st0_tag == TW_Infinity )
+    {
+      if ( signnegative(st0_ptr) )
+        arith_invalid(0);  /* sqrt(-Infinity) is invalid */
+      return;
+    }
+  else if ( st0_tag == TW_Denormal )
+    {
+      if (signnegative(st0_ptr))
+        {
+          arith_invalid(0);  /* sqrt(negative) is invalid */
+          return;
+        }
+
+      if ( denormal_operand() < 0 )
+        return;
+
+      FPU_to_exp16(st0_ptr, st0_ptr);
+
+      expon = exponent16(st0_ptr);
+
+      goto denormal_arg;
+    }
+
+  single_arg_error(st0_ptr, st0_tag);
+
+}
+
+
+static void frndint_(FPU_REG *st0_ptr, u_char st0_tag)
+{
+  int flags, tag;
+
+  if ( st0_tag == TAG_Valid )
+    {
+      u_char sign;
+
+    denormal_arg:
+
+      sign = getsign(st0_ptr);
+
+      if (exponent(st0_ptr) > 63)
+        return;
+
+      if ( st0_tag == TW_Denormal )
+        {
+          if (denormal_operand() < 0 )
+            return;
+        }
+
+      /* Fortunately, this can't overflow to 2^64 */
+      if ( (flags = FPU_round_to_int(st0_ptr, st0_tag)) )
+        set_precision_flag(flags);
+
+      setexponent16(st0_ptr, 63);
+      tag = FPU_normalize(st0_ptr);
+      setsign(st0_ptr, sign);
+      FPU_settag0(tag);
+      return;
+    }
+
+  if ( st0_tag == TAG_Zero )
+    return;
+
+  if ( st0_tag == TAG_Special )
+    st0_tag = FPU_Special(st0_ptr);
+
+  if ( st0_tag == TW_Denormal )
+    goto denormal_arg;
+  else if ( st0_tag == TW_Infinity )
+    return;
+  else
+    single_arg_error(st0_ptr, st0_tag);
+}
+
+
+static int fsin(FPU_REG *st0_ptr, u_char tag)
+{
+  u_char arg_sign = getsign(st0_ptr);
+
+  if ( tag == TAG_Valid )
+    {
+      int q;
+
+      if ( exponent(st0_ptr) > -40 )
+        {
+          if ( (q = trig_arg(st0_ptr, 0)) == -1 )
+            {
+              /* Operand is out of range */
+              return 1;
+            }
+
+          poly_sine(st0_ptr);
+          
+          if (q & 2)
+            changesign(st0_ptr);
+
+          setsign(st0_ptr, getsign(st0_ptr) ^ arg_sign);
+
+          /* We do not really know if up or down */
+          set_precision_flag_up();
+          return 0;
+        }
+      else
+        {
+          /* For a small arg, the result == the argument */
+          set_precision_flag_up();  /* Must be up. */
+          return 0;
+        }
+    }
+
+  if ( tag == TAG_Zero )
+    {
+      setcc(0);
+      return 0;
+    }
+
+  if ( tag == TAG_Special )
+    tag = FPU_Special(st0_ptr);
+
+  if ( tag == TW_Denormal )
+    {
+      if ( denormal_operand() < 0 )
+        return 1;
+
+      /* For a small arg, the result == the argument */
+      /* Underflow may happen */
+      FPU_to_exp16(st0_ptr, st0_ptr);
+      
+      tag = FPU_round(st0_ptr, 1, 0, FULL_PRECISION, arg_sign);
+
+      FPU_settag0(tag);
+
+      return 0;
+    }
+  else if ( tag == TW_Infinity )
+    {
+      /* The 80486 treats infinity as an invalid operand */
+      arith_invalid(0);
+      return 1;
+    }
+  else
+    {
+      single_arg_error(st0_ptr, tag);
+      return 1;
+    }
+}
+
+
+static int f_cos(FPU_REG *st0_ptr, u_char tag)
+{
+  u_char st0_sign;
+
+  st0_sign = getsign(st0_ptr);
+
+  if ( tag == TAG_Valid )
+    {
+      int q;
+
+      if ( exponent(st0_ptr) > -40 )
+        {
+          if ( (exponent(st0_ptr) < 0)
+              || ((exponent(st0_ptr) == 0)
+                  && (significand(st0_ptr) <= 0xc90fdaa22168c234LL)) )
+            {
+              poly_cos(st0_ptr);
+
+              /* We do not really know if up or down */
+              set_precision_flag_down();
+          
+              return 0;
+            }
+          else if ( (q = trig_arg(st0_ptr, FCOS)) != -1 )
+            {
+              poly_sine(st0_ptr);
+
+              if ((q+1) & 2)
+                changesign(st0_ptr);
+
+              /* We do not really know if up or down */
+              set_precision_flag_down();
+          
+              return 0;
+            }
+          else
+            {
+              /* Operand is out of range */
+              return 1;
+            }
+        }
+      else
+        {
+        denormal_arg:
+
+          setcc(0);
+          FPU_copy_to_reg0(&CONST_1, TAG_Valid);
+#ifdef PECULIAR_486
+          set_precision_flag_down();  /* 80486 appears to do this. */
+#else
+          set_precision_flag_up();  /* Must be up. */
+#endif /* PECULIAR_486 */
+          return 0;
+        }
+    }
+  else if ( tag == TAG_Zero )
+    {
+      FPU_copy_to_reg0(&CONST_1, TAG_Valid);
+      setcc(0);
+      return 0;
+    }
+
+  if ( tag == TAG_Special )
+    tag = FPU_Special(st0_ptr);
+
+  if ( tag == TW_Denormal )
+    {
+      if ( denormal_operand() < 0 )
+        return 1;
+
+      goto denormal_arg;
+    }
+  else if ( tag == TW_Infinity )
+    {
+      /* The 80486 treats infinity as an invalid operand */
+      arith_invalid(0);
+      return 1;
+    }
+  else
+    {
+      single_arg_error(st0_ptr, tag);  /* requires st0_ptr == &st(0) */
+      return 1;
+    }
+}
+
+
+static void fcos(FPU_REG *st0_ptr, u_char st0_tag)
+{
+  f_cos(st0_ptr, st0_tag);
+}
+
+
+static void fsincos(FPU_REG *st0_ptr, u_char st0_tag)
+{
+  FPU_REG *st_new_ptr;
+  FPU_REG arg;
+  u_char tag;
+
+  /* Stack underflow has higher priority */
+  if ( st0_tag == TAG_Empty )
+    {
+      FPU_stack_underflow();  /* Puts a QNaN in st(0) */
+      if ( control_word & CW_Invalid )
+        {
+          st_new_ptr = &st(-1);
+          push();
+          FPU_stack_underflow();  /* Puts a QNaN in the new st(0) */
+        }
+      return;
+    }
+
+  if ( STACK_OVERFLOW )
+    { FPU_stack_overflow(); return; }
+
+  if ( st0_tag == TAG_Special )
+    tag = FPU_Special(st0_ptr);
+  else
+    tag = st0_tag;
+
+  if ( tag == TW_NaN )
+    {
+      single_arg_2_error(st0_ptr, TW_NaN);
+      return;
+    }
+  else if ( tag == TW_Infinity )
+    {
+      /* The 80486 treats infinity as an invalid operand */
+      if ( arith_invalid(0) >= 0 )
+        {
+          /* Masked response */
+          push();
+          arith_invalid(0);
+        }
+      return;
+    }
+
+  reg_copy(st0_ptr, &arg);
+  if ( !fsin(st0_ptr, st0_tag) )
+    {
+      push();
+      FPU_copy_to_reg0(&arg, st0_tag);
+      f_cos(&st(0), st0_tag);
+    }
+  else
+    {
+      /* An error, so restore st(0) */
+      FPU_copy_to_reg0(&arg, st0_tag);
+    }
+}
+
+
+/*---------------------------------------------------------------------------*/
+/* The following all require two arguments: st(0) and st(1) */
+
+/* A lean, mean kernel for the fprem instructions. This relies upon
+   the division and rounding to an integer in do_fprem giving an
+   exact result. Because of this, rem_kernel() needs to deal only with
+   the least significant 64 bits, the more significant bits of the
+   result must be zero.
+ */
+static void rem_kernel(unsigned long long st0, unsigned long long *y,
+                       unsigned long long st1,
+                       unsigned long long q, int n)
+{
+  int dummy;
+  unsigned long long x;
+
+  x = st0 << n;
+
+  /* Do the required multiplication and subtraction in the one operation */
+
+  /* lsw x -= lsw st1 * lsw q */
+  asm volatile ("mull %4; subl %%eax,%0; sbbl %%edx,%1"
+                :"=m" (((unsigned *)&x)[0]), "=m" (((unsigned *)&x)[1]),
+                "=a" (dummy)
+                :"2" (((unsigned *)&st1)[0]), "m" (((unsigned *)&q)[0])
+                :"%dx");
+  /* msw x -= msw st1 * lsw q */
+  asm volatile ("mull %3; subl %%eax,%0"
+                :"=m" (((unsigned *)&x)[1]), "=a" (dummy)
+                :"1" (((unsigned *)&st1)[1]), "m" (((unsigned *)&q)[0])
+                :"%dx");
+  /* msw x -= lsw st1 * msw q */
+  asm volatile ("mull %3; subl %%eax,%0"
+                :"=m" (((unsigned *)&x)[1]), "=a" (dummy)
+                :"1" (((unsigned *)&st1)[0]), "m" (((unsigned *)&q)[1])
+                :"%dx");
+
+  *y = x;
+}
+
+
+/* Remainder of st(0) / st(1) */
+/* This routine produces exact results, i.e. there is never any
+   rounding or truncation, etc of the result. */
+static void do_fprem(FPU_REG *st0_ptr, u_char st0_tag, int round)
+{
+  FPU_REG *st1_ptr = &st(1);
+  u_char st1_tag = FPU_gettagi(1);
+
+  if ( !((st0_tag ^ TAG_Valid) | (st1_tag ^ TAG_Valid)) )
+    {
+      FPU_REG tmp, st0, st1;
+      u_char st0_sign, st1_sign;
+      u_char tmptag;
+      int tag;
+      int old_cw;
+      int expdif;
+      long long q;
+      unsigned short saved_status;
+      int cc;
+
+    fprem_valid:
+      /* Convert registers for internal use. */
+      st0_sign = FPU_to_exp16(st0_ptr, &st0);
+      st1_sign = FPU_to_exp16(st1_ptr, &st1);
+      expdif = exponent16(&st0) - exponent16(&st1);
+
+      old_cw = control_word;
+      cc = 0;
+
+      /* We want the status following the denorm tests, but don't want
+         the status changed by the arithmetic operations. */
+      saved_status = partial_status;
+      control_word &= ~CW_RC;
+      control_word |= RC_CHOP;
+
+      if ( expdif < 64 )
+        {
+          /* This should be the most common case */
+
+          if ( expdif > -2 )
+            {
+              u_char sign = st0_sign ^ st1_sign;
+              tag = FPU_u_div(&st0, &st1, &tmp,
+                              PR_64_BITS | RC_CHOP | 0x3f,
+                              sign);
+              setsign(&tmp, sign);
+
+              if ( exponent(&tmp) >= 0 )
+                {
+                  FPU_round_to_int(&tmp, tag);  /* Fortunately, this can't
+                                                   overflow to 2^64 */
+                  q = significand(&tmp);
+
+                  rem_kernel(significand(&st0),
+                             &significand(&tmp),
+                             significand(&st1),
+                             q, expdif);
+
+                  setexponent16(&tmp, exponent16(&st1));
+                }
+              else
+                {
+                  reg_copy(&st0, &tmp);
+                  q = 0;
+                }
+
+              if ( (round == RC_RND) && (tmp.sigh & 0xc0000000) )
+                {
+                  /* We may need to subtract st(1) once more,
+                     to get a result <= 1/2 of st(1). */
+                  unsigned long long x;
+                  expdif = exponent16(&st1) - exponent16(&tmp);
+                  if ( expdif <= 1 )
+                    {
+                      if ( expdif == 0 )
+                        x = significand(&st1) - significand(&tmp);
+                      else /* expdif is 1 */
+                        x = (significand(&st1) << 1) - significand(&tmp);
+                      if ( (x < significand(&tmp)) ||
+                          /* or equi-distant (from 0 & st(1)) and q is odd */
+                          ((x == significand(&tmp)) && (q & 1) ) )
+                        {
+                          st0_sign = ! st0_sign;
+                          significand(&tmp) = x;
+                          q++;
+                        }
+                    }
+                }
+
+              if (q & 4) cc |= SW_C0;
+              if (q & 2) cc |= SW_C3;
+              if (q & 1) cc |= SW_C1;
+            }
+          else
+            {
+              control_word = old_cw;
+              setcc(0);
+              return;
+            }
+        }
+      else
+        {
+          /* There is a large exponent difference ( >= 64 ) */
+          /* To make much sense, the code in this section should
+             be done at high precision. */
+          int exp_1, N;
+          u_char sign;
+
+          /* prevent overflow here */
+          /* N is 'a number between 32 and 63' (p26-113) */
+          reg_copy(&st0, &tmp);
+          tmptag = st0_tag;
+          N = (expdif & 0x0000001f) + 32;  /* This choice gives results
+                                              identical to an AMD 486 */
+          setexponent16(&tmp, N);
+          exp_1 = exponent16(&st1);
+          setexponent16(&st1, 0);
+          expdif -= N;
+
+          sign = getsign(&tmp) ^ st1_sign;
+          tag = FPU_u_div(&tmp, &st1, &tmp, PR_64_BITS | RC_CHOP | 0x3f,
+                          sign);
+          setsign(&tmp, sign);
+
+          FPU_round_to_int(&tmp, tag);  /* Fortunately, this can't
+                                           overflow to 2^64 */
+
+          rem_kernel(significand(&st0),
+                     &significand(&tmp),
+                     significand(&st1),
+                     significand(&tmp),
+                     exponent(&tmp)
+                     ); 
+          setexponent16(&tmp, exp_1 + expdif);
+
+          /* It is possible for the operation to be complete here.
+             What does the IEEE standard say? The Intel 80486 manual
+             implies that the operation will never be completed at this
+             point, and the behaviour of a real 80486 confirms this.
+           */
+          if ( !(tmp.sigh | tmp.sigl) )
+            {
+              /* The result is zero */
+              control_word = old_cw;
+              partial_status = saved_status;
+              FPU_copy_to_reg0(&CONST_Z, TAG_Zero);
+              setsign(&st0, st0_sign);
+#ifdef PECULIAR_486
+              setcc(SW_C2);
+#else
+              setcc(0);
+#endif /* PECULIAR_486 */
+              return;
+            }
+          cc = SW_C2;
+        }
+
+      control_word = old_cw;
+      partial_status = saved_status;
+      tag = FPU_normalize_nuo(&tmp);
+      reg_copy(&tmp, st0_ptr);
+
+      /* The only condition to be looked for is underflow,
+         and it can occur here only if underflow is unmasked. */
+      if ( (exponent16(&tmp) <= EXP_UNDER) && (tag != TAG_Zero)
+          && !(control_word & CW_Underflow) )
+        {
+          setcc(cc);
+          tag = arith_underflow(st0_ptr);
+          setsign(st0_ptr, st0_sign);
+          FPU_settag0(tag);
+          return;
+        }
+      else if ( (exponent16(&tmp) > EXP_UNDER) || (tag == TAG_Zero) )
+        {
+          stdexp(st0_ptr);
+          setsign(st0_ptr, st0_sign);
+        }
+      else
+        {
+          tag = FPU_round(st0_ptr, 0, 0, FULL_PRECISION, st0_sign);
+        }
+      FPU_settag0(tag);
+      setcc(cc);
+
+      return;
+    }
+
+  if ( st0_tag == TAG_Special )
+    st0_tag = FPU_Special(st0_ptr);
+  if ( st1_tag == TAG_Special )
+    st1_tag = FPU_Special(st1_ptr);
+
+  if ( ((st0_tag == TAG_Valid) && (st1_tag == TW_Denormal))
+            || ((st0_tag == TW_Denormal) && (st1_tag == TAG_Valid))
+            || ((st0_tag == TW_Denormal) && (st1_tag == TW_Denormal)) )
+    {
+      if ( denormal_operand() < 0 )
+        return;
+      goto fprem_valid;
+    }
+  else if ( (st0_tag == TAG_Empty) || (st1_tag == TAG_Empty) )
+    {
+      FPU_stack_underflow();
+      return;
+    }
+  else if ( st0_tag == TAG_Zero )
+    {
+      if ( st1_tag == TAG_Valid )
+        {
+          setcc(0); return;
+        }
+      else if ( st1_tag == TW_Denormal )
+        {
+          if ( denormal_operand() < 0 )
+            return;
+          setcc(0); return;
+        }
+      else if ( st1_tag == TAG_Zero )
+        { arith_invalid(0); return; } /* fprem(?,0) always invalid */
+      else if ( st1_tag == TW_Infinity )
+        { setcc(0); return; }
+    }
+  else if ( (st0_tag == TAG_Valid) || (st0_tag == TW_Denormal) )
+    {
+      if ( st1_tag == TAG_Zero )
+        {
+          arith_invalid(0); /* fprem(Valid,Zero) is invalid */
+          return;
+        }
+      else if ( st1_tag != TW_NaN )
+        {
+          if ( ((st0_tag == TW_Denormal) || (st1_tag == TW_Denormal))
+               && (denormal_operand() < 0) )
+            return;
+
+          if ( st1_tag == TW_Infinity )
+            {
+              /* fprem(Valid,Infinity) is o.k. */
+              setcc(0); return;
+            }
+        }
+    }
+  else if ( st0_tag == TW_Infinity )
+    {
+      if ( st1_tag != TW_NaN )
+        {
+          arith_invalid(0); /* fprem(Infinity,?) is invalid */
+          return;
+        }
+    }
+
+  /* One of the registers must contain a NaN if we got here. */
+
+#ifdef PARANOID
+  if ( (st0_tag != TW_NaN) && (st1_tag != TW_NaN) )
+      EXCEPTION(EX_INTERNAL | 0x118);
+#endif /* PARANOID */
+
+  real_2op_NaN(st1_ptr, st1_tag, 0, st1_ptr);
+
+}
+
+
+/* ST(1) <- ST(1) * log ST;  pop ST */
+static void fyl2x(FPU_REG *st0_ptr, u_char st0_tag)
+{
+  FPU_REG *st1_ptr = &st(1), exponent;
+  u_char st1_tag = FPU_gettagi(1);
+  u_char sign;
+  int e, tag;
+
+  clear_C1();
+
+  if ( (st0_tag == TAG_Valid) && (st1_tag == TAG_Valid) )
+    {
+    both_valid:
+      /* Both regs are Valid or Denormal */
+      if ( signpositive(st0_ptr) )
+        {
+          if ( st0_tag == TW_Denormal )
+            FPU_to_exp16(st0_ptr, st0_ptr);
+          else
+            /* Convert st(0) for internal use. */
+            setexponent16(st0_ptr, exponent(st0_ptr));
+
+          if ( (st0_ptr->sigh == 0x80000000) && (st0_ptr->sigl == 0) )
+            {
+              /* Special case. The result can be precise. */
+              u_char esign;
+              e = exponent16(st0_ptr);
+              if ( e >= 0 )
+                {
+                  exponent.sigh = e;
+                  esign = SIGN_POS;
+                }
+              else
+                {
+                  exponent.sigh = -e;
+                  esign = SIGN_NEG;
+                }
+              exponent.sigl = 0;
+              setexponent16(&exponent, 31);
+              tag = FPU_normalize_nuo(&exponent);
+              stdexp(&exponent);
+              setsign(&exponent, esign);
+              tag = FPU_mul(&exponent, tag, 1, FULL_PRECISION);
+              if ( tag >= 0 )
+                FPU_settagi(1, tag);
+            }
+          else
+            {
+              /* The usual case */
+              sign = getsign(st1_ptr);
+              if ( st1_tag == TW_Denormal )
+                FPU_to_exp16(st1_ptr, st1_ptr);
+              else
+                /* Convert st(1) for internal use. */
+                setexponent16(st1_ptr, exponent(st1_ptr));
+              poly_l2(st0_ptr, st1_ptr, sign);
+            }
+        }
+      else
+        {
+          /* negative */
+          if ( arith_invalid(1) < 0 )
+            return;
+        }
+
+      FPU_pop();
+
+      return;
+    }
+
+  if ( st0_tag == TAG_Special )
+    st0_tag = FPU_Special(st0_ptr);
+  if ( st1_tag == TAG_Special )
+    st1_tag = FPU_Special(st1_ptr);
+
+  if ( (st0_tag == TAG_Empty) || (st1_tag == TAG_Empty) )
+    {
+      FPU_stack_underflow_pop(1);
+      return;
+    }
+  else if ( (st0_tag <= TW_Denormal) && (st1_tag <= TW_Denormal) )
+    {
+      if ( st0_tag == TAG_Zero )
+        {
+          if ( st1_tag == TAG_Zero )
+            {
+              /* Both args zero is invalid */
+              if ( arith_invalid(1) < 0 )
+                return;
+            }
+          else
+            {
+              u_char sign;
+              sign = getsign(st1_ptr)^SIGN_NEG;
+              if ( FPU_divide_by_zero(1, sign) < 0 )
+                return;
+
+              setsign(st1_ptr, sign);
+            }
+        }
+      else if ( st1_tag == TAG_Zero )
+        {
+          /* st(1) contains zero, st(0) valid <> 0 */
+          /* Zero is the valid answer */
+          sign = getsign(st1_ptr);
+          
+          if ( signnegative(st0_ptr) )
+            {
+              /* log(negative) */
+              if ( arith_invalid(1) < 0 )
+                return;
+            }
+          else if ( (st0_tag == TW_Denormal) && (denormal_operand() < 0) )
+            return;
+          else
+            {
+              if ( exponent(st0_ptr) < 0 )
+                sign ^= SIGN_NEG;
+
+              FPU_copy_to_reg1(&CONST_Z, TAG_Zero);
+              setsign(st1_ptr, sign);
+            }
+        }
+      else
+        {
+          /* One or both operands are denormals. */
+          if ( denormal_operand() < 0 )
+            return;
+          goto both_valid;
+        }
+    }
+  else if ( (st0_tag == TW_NaN) || (st1_tag == TW_NaN) )
+    {
+      if ( real_2op_NaN(st0_ptr, st0_tag, 1, st0_ptr) < 0 )
+        return;
+    }
+  /* One or both arg must be an infinity */
+  else if ( st0_tag == TW_Infinity )
+    {
+      if ( (signnegative(st0_ptr)) || (st1_tag == TAG_Zero) )
+        {
+          /* log(-infinity) or 0*log(infinity) */
+          if ( arith_invalid(1) < 0 )
+            return;
+        }
+      else
+        {
+          u_char sign = getsign(st1_ptr);
+
+          if ( (st1_tag == TW_Denormal) && (denormal_operand() < 0) )
+            return;
+
+          FPU_copy_to_reg1(&CONST_INF, TAG_Special);
+          setsign(st1_ptr, sign);
+        }
+    }
+  /* st(1) must be infinity here */
+  else if ( ((st0_tag == TAG_Valid) || (st0_tag == TW_Denormal))
+            && ( signpositive(st0_ptr) ) )
+    {
+      if ( exponent(st0_ptr) >= 0 )
+        {
+          if ( (exponent(st0_ptr) == 0) &&
+              (st0_ptr->sigh == 0x80000000) &&
+              (st0_ptr->sigl == 0) )
+            {
+              /* st(0) holds 1.0 */
+              /* infinity*log(1) */
+              if ( arith_invalid(1) < 0 )
+                return;
+            }
+          /* else st(0) is positive and > 1.0 */
+        }
+      else
+        {
+          /* st(0) is positive and < 1.0 */
+
+          if ( (st0_tag == TW_Denormal) && (denormal_operand() < 0) )
+            return;
+
+          changesign(st1_ptr);
+        }
+    }
+  else
+    {
+      /* st(0) must be zero or negative */
+      if ( st0_tag == TAG_Zero )
+        {
+          /* This should be invalid, but a real 80486 is happy with it. */
+
+#ifndef PECULIAR_486
+          sign = getsign(st1_ptr);
+          if ( FPU_divide_by_zero(1, sign) < 0 )
+            return;
+#endif /* PECULIAR_486 */
+
+          changesign(st1_ptr);
+        }
+      else if ( arith_invalid(1) < 0 )    /* log(negative) */
+        return;
+    }
+
+  FPU_pop();
+}
+
+
+static void fpatan(FPU_REG *st0_ptr, u_char st0_tag)
+{
+  FPU_REG *st1_ptr = &st(1);
+  u_char st1_tag = FPU_gettagi(1);
+  int tag;
+
+  clear_C1();
+  if ( !((st0_tag ^ TAG_Valid) | (st1_tag ^ TAG_Valid)) )
+    {
+    valid_atan:
+
+      poly_atan(st0_ptr, st0_tag, st1_ptr, st1_tag);
+
+      FPU_pop();
+
+      return;
+    }
+
+  if ( st0_tag == TAG_Special )
+    st0_tag = FPU_Special(st0_ptr);
+  if ( st1_tag == TAG_Special )
+    st1_tag = FPU_Special(st1_ptr);
+
+  if ( ((st0_tag == TAG_Valid) && (st1_tag == TW_Denormal))
+            || ((st0_tag == TW_Denormal) && (st1_tag == TAG_Valid))
+            || ((st0_tag == TW_Denormal) && (st1_tag == TW_Denormal)) )
+    {
+      if ( denormal_operand() < 0 )
+        return;
+
+      goto valid_atan;
+    }
+  else if ( (st0_tag == TAG_Empty) || (st1_tag == TAG_Empty) )
+    {
+      FPU_stack_underflow_pop(1);
+      return;
+    }
+  else if ( (st0_tag == TW_NaN) || (st1_tag == TW_NaN) )
+    {
+      if ( real_2op_NaN(st0_ptr, st0_tag, 1, st0_ptr) >= 0 )
+          FPU_pop();
+      return;
+    }
+  else if ( (st0_tag == TW_Infinity) || (st1_tag == TW_Infinity) )
+    {
+      u_char sign = getsign(st1_ptr);
+      if ( st0_tag == TW_Infinity )
+        {
+          if ( st1_tag == TW_Infinity )
+            {
+              if ( signpositive(st0_ptr) )
+                {
+                  FPU_copy_to_reg1(&CONST_PI4, TAG_Valid);
+                }
+              else
+                {
+                  setpositive(st1_ptr);
+                  tag = FPU_u_add(&CONST_PI4, &CONST_PI2, st1_ptr,
+                                  FULL_PRECISION, SIGN_POS,
+                                  exponent(&CONST_PI4), exponent(&CONST_PI2));
+                  if ( tag >= 0 )
+                    FPU_settagi(1, tag);
+                }
+            }
+          else
+            {
+              if ( (st1_tag == TW_Denormal) && (denormal_operand() < 0) )
+                return;
+
+              if ( signpositive(st0_ptr) )
+                {
+                  FPU_copy_to_reg1(&CONST_Z, TAG_Zero);
+                  setsign(st1_ptr, sign);   /* An 80486 preserves the sign */
+                  FPU_pop();
+                  return;
+                }
+              else
+                {
+                  FPU_copy_to_reg1(&CONST_PI, TAG_Valid);
+                }
+            }
+        }
+      else
+        {
+          /* st(1) is infinity, st(0) not infinity */
+          if ( (st0_tag == TW_Denormal) && (denormal_operand() < 0) )
+            return;
+
+          FPU_copy_to_reg1(&CONST_PI2, TAG_Valid);
+        }
+      setsign(st1_ptr, sign);
+    }
+  else if ( st1_tag == TAG_Zero )
+    {
+      /* st(0) must be valid or zero */
+      u_char sign = getsign(st1_ptr);
+
+      if ( (st0_tag == TW_Denormal) && (denormal_operand() < 0) )
+        return;
+
+      if ( signpositive(st0_ptr) )
+        {
+          /* An 80486 preserves the sign */
+          FPU_pop();
+          return;
+        }
+
+      FPU_copy_to_reg1(&CONST_PI, TAG_Valid);
+      setsign(st1_ptr, sign);
+    }
+  else if ( st0_tag == TAG_Zero )
+    {
+      /* st(1) must be TAG_Valid here */
+      u_char sign = getsign(st1_ptr);
+
+      if ( (st1_tag == TW_Denormal) && (denormal_operand() < 0) )
+        return;
+
+      FPU_copy_to_reg1(&CONST_PI2, TAG_Valid);
+      setsign(st1_ptr, sign);
+    }
+#ifdef PARANOID
+  else
+    EXCEPTION(EX_INTERNAL | 0x125);
+#endif /* PARANOID */
+
+  FPU_pop();
+  set_precision_flag_up();  /* We do not really know if up or down */
+}
+
+
+static void fprem(FPU_REG *st0_ptr, u_char st0_tag)
+{
+  do_fprem(st0_ptr, st0_tag, RC_CHOP);
+}
+
+
+static void fprem1(FPU_REG *st0_ptr, u_char st0_tag)
+{
+  do_fprem(st0_ptr, st0_tag, RC_RND);
+}
+
+
+static void fyl2xp1(FPU_REG *st0_ptr, u_char st0_tag)
+{
+  u_char sign, sign1;
+  FPU_REG *st1_ptr = &st(1), a, b;
+  u_char st1_tag = FPU_gettagi(1);
+
+  clear_C1();
+  if ( !((st0_tag ^ TAG_Valid) | (st1_tag ^ TAG_Valid)) )
+    {
+    valid_yl2xp1:
+
+      sign = getsign(st0_ptr);
+      sign1 = getsign(st1_ptr);
+
+      FPU_to_exp16(st0_ptr, &a);
+      FPU_to_exp16(st1_ptr, &b);
+
+      if ( poly_l2p1(sign, sign1, &a, &b, st1_ptr) )
+        return;
+
+      FPU_pop();
+      return;
+    }
+
+  if ( st0_tag == TAG_Special )
+    st0_tag = FPU_Special(st0_ptr);
+  if ( st1_tag == TAG_Special )
+    st1_tag = FPU_Special(st1_ptr);
+
+  if ( ((st0_tag == TAG_Valid) && (st1_tag == TW_Denormal))
+            || ((st0_tag == TW_Denormal) && (st1_tag == TAG_Valid))
+            || ((st0_tag == TW_Denormal) && (st1_tag == TW_Denormal)) )
+    {
+      if ( denormal_operand() < 0 )
+        return;
+
+      goto valid_yl2xp1;
+    }
+  else if ( (st0_tag == TAG_Empty) | (st1_tag == TAG_Empty) )
+    {
+      FPU_stack_underflow_pop(1);
+      return;
+    }
+  else if ( st0_tag == TAG_Zero )
+    {
+      switch ( st1_tag )
+        {
+        case TW_Denormal:
+          if ( denormal_operand() < 0 )
+            return;
+
+        case TAG_Zero:
+        case TAG_Valid:
+          setsign(st0_ptr, getsign(st0_ptr) ^ getsign(st1_ptr));
+          FPU_copy_to_reg1(st0_ptr, st0_tag);
+          break;
+
+        case TW_Infinity:
+          /* Infinity*log(1) */
+          if ( arith_invalid(1) < 0 )
+            return;
+          break;
+
+        case TW_NaN:
+          if ( real_2op_NaN(st0_ptr, st0_tag, 1, st0_ptr) < 0 )
+            return;
+          break;
+
+        default:
+#ifdef PARANOID
+          EXCEPTION(EX_INTERNAL | 0x116);
+          return;
+#endif /* PARANOID */
+          break;
+        }
+    }
+  else if ( (st0_tag == TAG_Valid) || (st0_tag == TW_Denormal) )
+    {
+      switch ( st1_tag )
+        {
+        case TAG_Zero:
+          if ( signnegative(st0_ptr) )
+            {
+              if ( exponent(st0_ptr) >= 0 )
+                {
+                  /* st(0) holds <= -1.0 */
+#ifdef PECULIAR_486   /* Stupid 80486 doesn't worry about log(negative). */
+                  changesign(st1_ptr);
+#else
+                  if ( arith_invalid(1) < 0 )
+                    return;
+#endif /* PECULIAR_486 */
+                }
+              else if ( (st0_tag == TW_Denormal) && (denormal_operand() < 0) )
+                return;
+              else
+                changesign(st1_ptr);
+            }
+          else if ( (st0_tag == TW_Denormal) && (denormal_operand() < 0) )
+            return;
+          break;
+
+        case TW_Infinity:
+          if ( signnegative(st0_ptr) )
+            {
+              if ( (exponent(st0_ptr) >= 0) &&
+                  !((st0_ptr->sigh == 0x80000000) &&
+                    (st0_ptr->sigl == 0)) )
+                {
+                  /* st(0) holds < -1.0 */
+#ifdef PECULIAR_486   /* Stupid 80486 doesn't worry about log(negative). */
+                  changesign(st1_ptr);
+#else
+                  if ( arith_invalid(1) < 0 ) return;
+#endif /* PECULIAR_486 */
+                }
+              else if ( (st0_tag == TW_Denormal) && (denormal_operand() < 0) )
+                return;
+              else
+                changesign(st1_ptr);
+            }
+          else if ( (st0_tag == TW_Denormal) && (denormal_operand() < 0) )
+            return;
+          break;
+
+        case TW_NaN:
+          if ( real_2op_NaN(st0_ptr, st0_tag, 1, st0_ptr) < 0 )
+            return;
+        }
+
+    }
+  else if ( st0_tag == TW_NaN )
+    {
+      if ( real_2op_NaN(st0_ptr, st0_tag, 1, st0_ptr) < 0 )
+        return;
+    }
+  else if ( st0_tag == TW_Infinity )
+    {
+      if ( st1_tag == TW_NaN )
+        {
+          if ( real_2op_NaN(st0_ptr, st0_tag, 1, st0_ptr) < 0 )
+            return;
+        }
+      else if ( signnegative(st0_ptr) )
+        {
+#ifndef PECULIAR_486
+          /* This should have higher priority than denormals, but... */
+          if ( arith_invalid(1) < 0 )  /* log(-infinity) */
+            return;
+#endif /* PECULIAR_486 */
+          if ( (st1_tag == TW_Denormal) && (denormal_operand() < 0) )
+            return;
+#ifdef PECULIAR_486
+          /* Denormal operands actually get higher priority */
+          if ( arith_invalid(1) < 0 )  /* log(-infinity) */
+            return;
+#endif /* PECULIAR_486 */
+        }
+      else if ( st1_tag == TAG_Zero )
+        {
+          /* log(infinity) */
+          if ( arith_invalid(1) < 0 )
+            return;
+        }
+        
+      /* st(1) must be valid here. */
+
+      else if ( (st1_tag == TW_Denormal) && (denormal_operand() < 0) )
+        return;
+
+      /* The Manual says that log(Infinity) is invalid, but a real
+         80486 sensibly says that it is o.k. */
+      else
+        {
+          u_char sign = getsign(st1_ptr);
+          FPU_copy_to_reg1(&CONST_INF, TAG_Special);
+          setsign(st1_ptr, sign);
+        }
+    }
+#ifdef PARANOID
+  else
+    {
+      EXCEPTION(EX_INTERNAL | 0x117);
+      return;
+    }
+#endif /* PARANOID */
+
+  FPU_pop();
+  return;
+
+}
+
+
+static void fscale(FPU_REG *st0_ptr, u_char st0_tag)
+{
+  FPU_REG *st1_ptr = &st(1);
+  u_char st1_tag = FPU_gettagi(1);
+  int old_cw = control_word;
+  u_char sign = getsign(st0_ptr);
+
+  clear_C1();
+  if ( !((st0_tag ^ TAG_Valid) | (st1_tag ^ TAG_Valid)) )
+    {
+      long scale;
+      FPU_REG tmp;
+
+      /* Convert register for internal use. */
+      setexponent16(st0_ptr, exponent(st0_ptr));
+
+    valid_scale:
+
+      if ( exponent(st1_ptr) > 30 )
+        {
+          /* 2^31 is far too large, would require 2^(2^30) or 2^(-2^30) */
+
+          if ( signpositive(st1_ptr) )
+            {
+              EXCEPTION(EX_Overflow);
+              FPU_copy_to_reg0(&CONST_INF, TAG_Special);
+            }
+          else
+            {
+              EXCEPTION(EX_Underflow);
+              FPU_copy_to_reg0(&CONST_Z, TAG_Zero);
+            }
+          setsign(st0_ptr, sign);
+          return;
+        }
+
+      control_word &= ~CW_RC;
+      control_word |= RC_CHOP;
+      reg_copy(st1_ptr, &tmp);
+      FPU_round_to_int(&tmp, st1_tag);      /* This can never overflow here */
+      control_word = old_cw;
+      scale = signnegative(st1_ptr) ? -tmp.sigl : tmp.sigl;
+      scale += exponent16(st0_ptr);
+
+      setexponent16(st0_ptr, scale);
+
+      /* Use FPU_round() to properly detect under/overflow etc */
+      FPU_round(st0_ptr, 0, 0, control_word, sign);
+
+      return;
+    }
+
+  if ( st0_tag == TAG_Special )
+    st0_tag = FPU_Special(st0_ptr);
+  if ( st1_tag == TAG_Special )
+    st1_tag = FPU_Special(st1_ptr);
+
+  if ( (st0_tag == TAG_Valid) || (st0_tag == TW_Denormal) )
+    {
+      switch ( st1_tag )
+        {
+        case TAG_Valid:
+          /* st(0) must be a denormal */
+          if ( (st0_tag == TW_Denormal) && (denormal_operand() < 0) )
+            return;
+
+          FPU_to_exp16(st0_ptr, st0_ptr);  /* Will not be left on stack */
+          goto valid_scale;
+
+        case TAG_Zero:
+          if ( st0_tag == TW_Denormal )
+            denormal_operand();
+          return;
+
+        case TW_Denormal:
+          denormal_operand();
+          return;
+
+        case TW_Infinity:
+          if ( (st0_tag == TW_Denormal) && (denormal_operand() < 0) )
+            return;
+
+          if ( signpositive(st1_ptr) )
+            FPU_copy_to_reg0(&CONST_INF, TAG_Special);
+          else
+            FPU_copy_to_reg0(&CONST_Z, TAG_Zero);
+          setsign(st0_ptr, sign);
+          return;
+
+        case TW_NaN:
+          real_2op_NaN(st1_ptr, st1_tag, 0, st0_ptr);
+          return;
+        }
+    }
+  else if ( st0_tag == TAG_Zero )
+    {
+      switch ( st1_tag )
+        {
+        case TAG_Valid:
+        case TAG_Zero:
+          return;
+
+        case TW_Denormal:
+          denormal_operand();
+          return;
+
+        case TW_Infinity:
+          if ( signpositive(st1_ptr) )
+            arith_invalid(0); /* Zero scaled by +Infinity */
+          return;
+
+        case TW_NaN:
+          real_2op_NaN(st1_ptr, st1_tag, 0, st0_ptr);
+          return;
+        }
+    }
+  else if ( st0_tag == TW_Infinity )
+    {
+      switch ( st1_tag )
+        {
+        case TAG_Valid:
+        case TAG_Zero:
+          return;
+
+        case TW_Denormal:
+          denormal_operand();
+          return;
+
+        case TW_Infinity:
+          if ( signnegative(st1_ptr) )
+            arith_invalid(0); /* Infinity scaled by -Infinity */
+          return;
+
+        case TW_NaN:
+          real_2op_NaN(st1_ptr, st1_tag, 0, st0_ptr);
+          return;
+        }
+    }
+  else if ( st0_tag == TW_NaN )
+    {
+      if ( st1_tag != TAG_Empty )
+        { real_2op_NaN(st1_ptr, st1_tag, 0, st0_ptr); return; }
+    }
+
+#ifdef PARANOID
+  if ( !((st0_tag == TAG_Empty) || (st1_tag == TAG_Empty)) )
+    {
+      EXCEPTION(EX_INTERNAL | 0x115);
+      return;
+    }
+#endif
+
+  /* At least one of st(0), st(1) must be empty */
+  FPU_stack_underflow();
+
+}
+
+
+/*---------------------------------------------------------------------------*/
+
+static FUNC_ST0 const trig_table_a[] = {
+  f2xm1, fyl2x, fptan, fpatan,
+  fxtract, fprem1, (FUNC_ST0)fdecstp, (FUNC_ST0)fincstp
+};
+
+void FPU_triga(void)
+{
+  (trig_table_a[FPU_rm])(&st(0), FPU_gettag0());
+}
+
+
+static FUNC_ST0 const trig_table_b[] =
+  {
+    fprem, fyl2xp1, fsqrt_, fsincos, frndint_, fscale, (FUNC_ST0)fsin, fcos
+  };
+
+void FPU_trigb(void)
+{
+  (trig_table_b[FPU_rm])(&st(0), FPU_gettag0());
+}
diff --git a/arch/i386/math-emu/get_address.c b/arch/i386/math-emu/get_address.c
new file mode 100644
index 000000000000..91175738e948
--- /dev/null
+++ b/arch/i386/math-emu/get_address.c
@@ -0,0 +1,449 @@
+/*---------------------------------------------------------------------------+
+ |  get_address.c                                                            |
+ |                                                                           |
+ | Get the effective address from an FPU instruction.                        |
+ |                                                                           |
+ | Copyright (C) 1992,1993,1994,1997                                         |
+ |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
+ |                       Australia.  E-mail   billm@suburbia.net             |
+ |                                                                           |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------+
+ | Note:                                                                     |
+ |    The file contains code which accesses user memory.                     |
+ |    Emulator static data may change when user memory is accessed, due to   |
+ |    other processes using the emulator while swapping is in progress.      |
+ +---------------------------------------------------------------------------*/
+
+
+#include <linux/stddef.h>
+
+#include <asm/uaccess.h>
+#include <asm/desc.h>
+
+#include "fpu_system.h"
+#include "exception.h"
+#include "fpu_emu.h"
+
+
+#define FPU_WRITE_BIT 0x10
+
+static int reg_offset[] = {
+        offsetof(struct info,___eax),
+        offsetof(struct info,___ecx),
+        offsetof(struct info,___edx),
+        offsetof(struct info,___ebx),
+        offsetof(struct info,___esp),
+        offsetof(struct info,___ebp),
+        offsetof(struct info,___esi),
+        offsetof(struct info,___edi)
+};
+
+#define REG_(x) (*(long *)(reg_offset[(x)]+(u_char *) FPU_info))
+
+static int reg_offset_vm86[] = {
+        offsetof(struct info,___cs),
+        offsetof(struct info,___vm86_ds),
+        offsetof(struct info,___vm86_es),
+        offsetof(struct info,___vm86_fs),
+        offsetof(struct info,___vm86_gs),
+        offsetof(struct info,___ss),
+        offsetof(struct info,___vm86_ds)
+      };
+
+#define VM86_REG_(x) (*(unsigned short *) \
+                      (reg_offset_vm86[((unsigned)x)]+(u_char *) FPU_info))
+
+/* These are dummy, fs and gs are not saved on the stack. */
+#define ___FS ___ds
+#define ___GS ___ds
+
+static int reg_offset_pm[] = {
+        offsetof(struct info,___cs),
+        offsetof(struct info,___ds),
+        offsetof(struct info,___es),
+        offsetof(struct info,___FS),
+        offsetof(struct info,___GS),
+        offsetof(struct info,___ss),
+        offsetof(struct info,___ds)
+      };
+
+#define PM_REG_(x) (*(unsigned short *) \
+                      (reg_offset_pm[((unsigned)x)]+(u_char *) FPU_info))
+
+
+/* Decode the SIB byte. This function assumes mod != 0 */
+static int sib(int mod, unsigned long *fpu_eip)
+{
+  u_char ss,index,base;
+  long offset;
+
+  RE_ENTRANT_CHECK_OFF;
+  FPU_code_access_ok(1);
+  FPU_get_user(base, (u_char __user *) (*fpu_eip));   /* The SIB byte */
+  RE_ENTRANT_CHECK_ON;
+  (*fpu_eip)++;
+  ss = base >> 6;
+  index = (base >> 3) & 7;
+  base &= 7;
+
+  if ((mod == 0) && (base == 5))
+    offset = 0;              /* No base register */
+  else
+    offset = REG_(base);
+
+  if (index == 4)
+    {
+      /* No index register */
+      /* A non-zero ss is illegal */
+      if ( ss )
+        EXCEPTION(EX_Invalid);
+    }
+  else
+    {
+      offset += (REG_(index)) << ss;
+    }
+
+  if (mod == 1)
+    {
+      /* 8 bit signed displacement */
+      long displacement;
+      RE_ENTRANT_CHECK_OFF;
+      FPU_code_access_ok(1);
+      FPU_get_user(displacement, (signed char __user *) (*fpu_eip));
+      offset += displacement;
+      RE_ENTRANT_CHECK_ON;
+      (*fpu_eip)++;
+    }
+  else if (mod == 2 || base == 5) /* The second condition also has mod==0 */
+    {
+      /* 32 bit displacement */
+      long displacement;
+      RE_ENTRANT_CHECK_OFF;
+      FPU_code_access_ok(4);
+      FPU_get_user(displacement, (long __user *) (*fpu_eip));
+      offset += displacement;
+      RE_ENTRANT_CHECK_ON;
+      (*fpu_eip) += 4;
+    }
+
+  return offset;
+}
+
+
+static unsigned long vm86_segment(u_char segment,
+                                  struct address *addr)
+{
+  segment--;
+#ifdef PARANOID
+  if ( segment > PREFIX_SS_ )
+    {
+      EXCEPTION(EX_INTERNAL|0x130);
+      math_abort(FPU_info,SIGSEGV);
+    }
+#endif /* PARANOID */
+  addr->selector = VM86_REG_(segment);
+  return (unsigned long)VM86_REG_(segment) << 4;
+}
+
+
+/* This should work for 16 and 32 bit protected mode. */
+static long pm_address(u_char FPU_modrm, u_char segment,
+                       struct address *addr, long offset)
+{ 
+  struct desc_struct descriptor;
+  unsigned long base_address, limit, address, seg_top;
+  unsigned short selector;
+
+  segment--;
+
+#ifdef PARANOID
+  /* segment is unsigned, so this also detects if segment was 0: */
+  if ( segment > PREFIX_SS_ )
+    {
+      EXCEPTION(EX_INTERNAL|0x132);
+      math_abort(FPU_info,SIGSEGV);
+    }
+#endif /* PARANOID */
+
+  switch ( segment )
+    {
+      /* fs and gs aren't used by the kernel, so they still have their
+         user-space values. */
+    case PREFIX_FS_-1:
+      /* The cast is needed here to get gcc 2.8.0 to use a 16 bit register
+         in the assembler statement. */
+
+      __asm__("mov %%fs,%0":"=r" (selector));
+      addr->selector = selector;
+      break;
+    case PREFIX_GS_-1:
+      /* The cast is needed here to get gcc 2.8.0 to use a 16 bit register
+         in the assembler statement. */
+      __asm__("mov %%gs,%0":"=r" (selector));
+      addr->selector = selector;
+      break;
+    default:
+      addr->selector = PM_REG_(segment);
+    }
+
+  descriptor = LDT_DESCRIPTOR(PM_REG_(segment));
+  base_address = SEG_BASE_ADDR(descriptor);
+  address = base_address + offset;
+  limit = base_address
+        + (SEG_LIMIT(descriptor)+1) * SEG_GRANULARITY(descriptor) - 1;
+  if ( limit < base_address ) limit = 0xffffffff;
+
+  if ( SEG_EXPAND_DOWN(descriptor) )
+    {
+      if ( SEG_G_BIT(descriptor) )
+        seg_top = 0xffffffff;
+      else
+        {
+          seg_top = base_address + (1 << 20);
+          if ( seg_top < base_address ) seg_top = 0xffffffff;
+        }
+      access_limit =
+        (address <= limit) || (address >= seg_top) ? 0 :
+          ((seg_top-address) >= 255 ? 255 : seg_top-address);
+    }
+  else
+    {
+      access_limit =
+        (address > limit) || (address < base_address) ? 0 :
+          ((limit-address) >= 254 ? 255 : limit-address+1);
+    }
+  if ( SEG_EXECUTE_ONLY(descriptor) ||
+      (!SEG_WRITE_PERM(descriptor) && (FPU_modrm & FPU_WRITE_BIT)) )
+    {
+      access_limit = 0;
+    }
+  return address;
+}
+
+
+/*
+       MOD R/M byte:  MOD == 3 has a special use for the FPU
+                      SIB byte used iff R/M = 100b
+
+       7   6   5   4   3   2   1   0
+       .....   .........   .........
+        MOD    OPCODE(2)     R/M
+
+
+       SIB byte
+
+       7   6   5   4   3   2   1   0
+       .....   .........   .........
+        SS      INDEX        BASE
+
+*/
+
+void __user *FPU_get_address(u_char FPU_modrm, unsigned long *fpu_eip,
+                  struct address *addr,
+                  fpu_addr_modes addr_modes)
+{
+  u_char mod;
+  unsigned rm = FPU_modrm & 7;
+  long *cpu_reg_ptr;
+  int address = 0;     /* Initialized just to stop compiler warnings. */
+
+  /* Memory accessed via the cs selector is write protected
+     in `non-segmented' 32 bit protected mode. */
+  if ( !addr_modes.default_mode && (FPU_modrm & FPU_WRITE_BIT)
+      && (addr_modes.override.segment == PREFIX_CS_) )
+    {
+      math_abort(FPU_info,SIGSEGV);
+    }
+
+  addr->selector = FPU_DS;   /* Default, for 32 bit non-segmented mode. */
+
+  mod = (FPU_modrm >> 6) & 3;
+
+  if (rm == 4 && mod != 3)
+    {
+      address = sib(mod, fpu_eip);
+    }
+  else
+    {
+      cpu_reg_ptr = & REG_(rm);
+      switch (mod)
+        {
+        case 0:
+          if (rm == 5)
+            {
+              /* Special case: disp32 */
+              RE_ENTRANT_CHECK_OFF;
+              FPU_code_access_ok(4);
+              FPU_get_user(address, (unsigned long __user *) (*fpu_eip));
+              (*fpu_eip) += 4;
+              RE_ENTRANT_CHECK_ON;
+              addr->offset = address;
+              return (void __user *) address;
+            }
+          else
+            {
+              address = *cpu_reg_ptr;  /* Just return the contents
+                                          of the cpu register */
+              addr->offset = address;
+              return (void __user *) address;
+            }
+        case 1:
+          /* 8 bit signed displacement */
+          RE_ENTRANT_CHECK_OFF;
+          FPU_code_access_ok(1);
+          FPU_get_user(address, (signed char __user *) (*fpu_eip));
+          RE_ENTRANT_CHECK_ON;
+          (*fpu_eip)++;
+          break;
+        case 2:
+          /* 32 bit displacement */
+          RE_ENTRANT_CHECK_OFF;
+          FPU_code_access_ok(4);
+          FPU_get_user(address, (long __user *) (*fpu_eip));
+          (*fpu_eip) += 4;
+          RE_ENTRANT_CHECK_ON;
+          break;
+        case 3:
+          /* Not legal for the FPU */
+          EXCEPTION(EX_Invalid);
+        }
+      address += *cpu_reg_ptr;
+    }
+
+  addr->offset = address;
+
+  switch ( addr_modes.default_mode )
+    {
+    case 0:
+      break;
+    case VM86:
+      address += vm86_segment(addr_modes.override.segment, addr);
+      break;
+    case PM16:
+    case SEG32:
+      address = pm_address(FPU_modrm, addr_modes.override.segment,
+                           addr, address);
+      break;
+    default:
+      EXCEPTION(EX_INTERNAL|0x133);
+    }
+
+  return (void __user *)address;
+}
+
+
+void __user *FPU_get_address_16(u_char FPU_modrm, unsigned long *fpu_eip,
+                     struct address *addr,
+                     fpu_addr_modes addr_modes)
+{
+  u_char mod;
+  unsigned rm = FPU_modrm & 7;
+  int address = 0;     /* Default used for mod == 0 */
+
+  /* Memory accessed via the cs selector is write protected
+     in `non-segmented' 32 bit protected mode. */
+  if ( !addr_modes.default_mode && (FPU_modrm & FPU_WRITE_BIT)
+      && (addr_modes.override.segment == PREFIX_CS_) )
+    {
+      math_abort(FPU_info,SIGSEGV);
+    }
+
+  addr->selector = FPU_DS;   /* Default, for 32 bit non-segmented mode. */
+
+  mod = (FPU_modrm >> 6) & 3;
+
+  switch (mod)
+    {
+    case 0:
+      if (rm == 6)
+        {
+          /* Special case: disp16 */
+          RE_ENTRANT_CHECK_OFF;
+          FPU_code_access_ok(2);
+          FPU_get_user(address, (unsigned short __user *) (*fpu_eip));
+          (*fpu_eip) += 2;
+          RE_ENTRANT_CHECK_ON;
+          goto add_segment;
+        }
+      break;
+    case 1:
+      /* 8 bit signed displacement */
+      RE_ENTRANT_CHECK_OFF;
+      FPU_code_access_ok(1);
+      FPU_get_user(address, (signed char __user *) (*fpu_eip));
+      RE_ENTRANT_CHECK_ON;
+      (*fpu_eip)++;
+      break;
+    case 2:
+      /* 16 bit displacement */
+      RE_ENTRANT_CHECK_OFF;
+      FPU_code_access_ok(2);
+      FPU_get_user(address, (unsigned short __user *) (*fpu_eip));
+      (*fpu_eip) += 2;
+      RE_ENTRANT_CHECK_ON;
+      break;
+    case 3:
+      /* Not legal for the FPU */
+      EXCEPTION(EX_Invalid);
+      break;
+    }
+  switch ( rm )
+    {
+    case 0:
+      address += FPU_info->___ebx + FPU_info->___esi;
+      break;
+    case 1:
+      address += FPU_info->___ebx + FPU_info->___edi;
+      break;
+    case 2:
+      address += FPU_info->___ebp + FPU_info->___esi;
+      if ( addr_modes.override.segment == PREFIX_DEFAULT )
+        addr_modes.override.segment = PREFIX_SS_;
+      break;
+    case 3:
+      address += FPU_info->___ebp + FPU_info->___edi;
+      if ( addr_modes.override.segment == PREFIX_DEFAULT )
+        addr_modes.override.segment = PREFIX_SS_;
+      break;
+    case 4:
+      address += FPU_info->___esi;
+      break;
+    case 5:
+      address += FPU_info->___edi;
+      break;
+    case 6:
+      address += FPU_info->___ebp;
+      if ( addr_modes.override.segment == PREFIX_DEFAULT )
+        addr_modes.override.segment = PREFIX_SS_;
+      break;
+    case 7:
+      address += FPU_info->___ebx;
+      break;
+    }
+
+ add_segment:
+  address &= 0xffff;
+
+  addr->offset = address;
+
+  switch ( addr_modes.default_mode )
+    {
+    case 0:
+      break;
+    case VM86:
+      address += vm86_segment(addr_modes.override.segment, addr);
+      break;
+    case PM16:
+    case SEG32:
+      address = pm_address(FPU_modrm, addr_modes.override.segment,
+                           addr, address);
+      break;
+    default:
+      EXCEPTION(EX_INTERNAL|0x131);
+    }
+
+  return (void __user *)address ;
+}
diff --git a/arch/i386/math-emu/load_store.c b/arch/i386/math-emu/load_store.c
new file mode 100644
index 000000000000..85314be2fef8
--- /dev/null
+++ b/arch/i386/math-emu/load_store.c
@@ -0,0 +1,270 @@
+/*---------------------------------------------------------------------------+
+ |  load_store.c                                                             |
+ |                                                                           |
+ | This file contains most of the code to interpret the FPU instructions     |
+ | which load and store from user memory.                                    |
+ |                                                                           |
+ | Copyright (C) 1992,1993,1994,1997                                         |
+ |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
+ |                       Australia.  E-mail   billm@suburbia.net             |
+ |                                                                           |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------+
+ | Note:                                                                     |
+ |    The file contains code which accesses user memory.                     |
+ |    Emulator static data may change when user memory is accessed, due to   |
+ |    other processes using the emulator while swapping is in progress.      |
+ +---------------------------------------------------------------------------*/
+
+#include <asm/uaccess.h>
+
+#include "fpu_system.h"
+#include "exception.h"
+#include "fpu_emu.h"
+#include "status_w.h"
+#include "control_w.h"
+
+
+#define _NONE_ 0   /* st0_ptr etc not needed */
+#define _REG0_ 1   /* Will be storing st(0) */
+#define _PUSH_ 3   /* Need to check for space to push onto stack */
+#define _null_ 4   /* Function illegal or not implemented */
+
+#define pop_0() { FPU_settag0(TAG_Empty); top++; }
+
+
+static u_char const type_table[32] = {
+  _PUSH_, _PUSH_, _PUSH_, _PUSH_,
+  _null_, _null_, _null_, _null_,
+  _REG0_, _REG0_, _REG0_, _REG0_,
+  _REG0_, _REG0_, _REG0_, _REG0_,
+  _NONE_, _null_, _NONE_, _PUSH_,
+  _NONE_, _PUSH_, _null_, _PUSH_,
+  _NONE_, _null_, _NONE_, _REG0_,
+  _NONE_, _REG0_, _NONE_, _REG0_
+  };
+
+u_char const data_sizes_16[32] = {
+  4,  4,  8,  2,  0,  0,  0,  0,
+  4,  4,  8,  2,  4,  4,  8,  2,
+  14, 0, 94, 10,  2, 10,  0,  8,  
+  14, 0, 94, 10,  2, 10,  2,  8
+};
+
+static u_char const data_sizes_32[32] = {
+  4,  4,  8,  2,  0,  0,  0,  0,
+  4,  4,  8,  2,  4,  4,  8,  2,
+  28, 0,108, 10,  2, 10,  0,  8,  
+  28, 0,108, 10,  2, 10,  2,  8
+};
+
+int FPU_load_store(u_char type, fpu_addr_modes addr_modes,
+                     void __user *data_address)
+{
+  FPU_REG loaded_data;
+  FPU_REG *st0_ptr;
+  u_char st0_tag = TAG_Empty;  /* This is just to stop a gcc warning. */
+  u_char loaded_tag;
+
+  st0_ptr = NULL;    /* Initialized just to stop compiler warnings. */
+
+  if ( addr_modes.default_mode & PROTECTED )
+    {
+      if ( addr_modes.default_mode == SEG32 )
+        {
+          if ( access_limit < data_sizes_32[type] )
+            math_abort(FPU_info,SIGSEGV);
+        }
+      else if ( addr_modes.default_mode == PM16 )
+        {
+          if ( access_limit < data_sizes_16[type] )
+            math_abort(FPU_info,SIGSEGV);
+        }
+#ifdef PARANOID
+      else
+        EXCEPTION(EX_INTERNAL|0x140);
+#endif /* PARANOID */
+    }
+
+  switch ( type_table[type] )
+    {
+    case _NONE_:
+      break;
+    case _REG0_:
+      st0_ptr = &st(0);       /* Some of these instructions pop after
+                                 storing */
+      st0_tag = FPU_gettag0();
+      break;
+    case _PUSH_:
+      {
+        if ( FPU_gettagi(-1) != TAG_Empty )
+          { FPU_stack_overflow(); return 0; }
+        top--;
+        st0_ptr = &st(0);
+      }
+      break;
+    case _null_:
+      FPU_illegal();
+      return 0;
+#ifdef PARANOID
+    default:
+      EXCEPTION(EX_INTERNAL|0x141);
+      return 0;
+#endif /* PARANOID */
+    }
+
+  switch ( type )
+    {
+    case 000:       /* fld m32real */
+      clear_C1();
+      loaded_tag = FPU_load_single((float __user *)data_address, &loaded_data);
+      if ( (loaded_tag == TAG_Special)
+           && isNaN(&loaded_data)
+           && (real_1op_NaN(&loaded_data) < 0) )
+        {
+          top++;
+          break;
+        }
+      FPU_copy_to_reg0(&loaded_data, loaded_tag);
+      break;
+    case 001:      /* fild m32int */
+      clear_C1();
+      loaded_tag = FPU_load_int32((long __user *)data_address, &loaded_data);
+      FPU_copy_to_reg0(&loaded_data, loaded_tag);
+      break;
+    case 002:      /* fld m64real */
+      clear_C1();
+      loaded_tag = FPU_load_double((double __user *)data_address, &loaded_data);
+      if ( (loaded_tag == TAG_Special)
+           && isNaN(&loaded_data)
+           && (real_1op_NaN(&loaded_data) < 0) )
+        {
+          top++;
+          break;
+        }
+      FPU_copy_to_reg0(&loaded_data, loaded_tag);
+      break;
+    case 003:      /* fild m16int */
+      clear_C1();
+      loaded_tag = FPU_load_int16((short __user *)data_address, &loaded_data);
+      FPU_copy_to_reg0(&loaded_data, loaded_tag);
+      break;
+    case 010:      /* fst m32real */
+      clear_C1();
+      FPU_store_single(st0_ptr, st0_tag, (float __user *)data_address);
+      break;
+    case 011:      /* fist m32int */
+      clear_C1();
+      FPU_store_int32(st0_ptr, st0_tag, (long __user *)data_address);
+      break;
+    case 012:     /* fst m64real */
+      clear_C1();
+      FPU_store_double(st0_ptr, st0_tag, (double __user *)data_address);
+      break;
+    case 013:     /* fist m16int */
+      clear_C1();
+      FPU_store_int16(st0_ptr, st0_tag, (short __user *)data_address);
+      break;
+    case 014:     /* fstp m32real */
+      clear_C1();
+      if ( FPU_store_single(st0_ptr, st0_tag, (float __user *)data_address) )
+        pop_0();  /* pop only if the number was actually stored
+                     (see the 80486 manual p16-28) */
+      break;
+    case 015:     /* fistp m32int */
+      clear_C1();
+      if ( FPU_store_int32(st0_ptr, st0_tag, (long __user *)data_address) )
+        pop_0();  /* pop only if the number was actually stored
+                     (see the 80486 manual p16-28) */
+      break;
+    case 016:     /* fstp m64real */
+      clear_C1();
+      if ( FPU_store_double(st0_ptr, st0_tag, (double __user *)data_address) )
+        pop_0();  /* pop only if the number was actually stored
+                     (see the 80486 manual p16-28) */
+      break;
+    case 017:     /* fistp m16int */
+      clear_C1();
+      if ( FPU_store_int16(st0_ptr, st0_tag, (short __user *)data_address) )
+        pop_0();  /* pop only if the number was actually stored
+                     (see the 80486 manual p16-28) */
+      break;
+    case 020:     /* fldenv  m14/28byte */
+      fldenv(addr_modes, (u_char __user *)data_address);
+      /* Ensure that the values just loaded are not changed by
+         fix-up operations. */
+      return 1;
+    case 022:     /* frstor m94/108byte */
+      frstor(addr_modes, (u_char __user *)data_address);
+      /* Ensure that the values just loaded are not changed by
+         fix-up operations. */
+      return 1;
+    case 023:     /* fbld m80dec */
+      clear_C1();
+      loaded_tag = FPU_load_bcd((u_char __user *)data_address);
+      FPU_settag0(loaded_tag);
+      break;
+    case 024:     /* fldcw */
+      RE_ENTRANT_CHECK_OFF;
+      FPU_access_ok(VERIFY_READ, data_address, 2);
+      FPU_get_user(control_word, (unsigned short __user *) data_address);
+      RE_ENTRANT_CHECK_ON;
+      if ( partial_status & ~control_word & CW_Exceptions )
+        partial_status |= (SW_Summary | SW_Backward);
+      else
+        partial_status &= ~(SW_Summary | SW_Backward);
+#ifdef PECULIAR_486
+      control_word |= 0x40;  /* An 80486 appears to always set this bit */
+#endif /* PECULIAR_486 */
+      return 1;
+    case 025:      /* fld m80real */
+      clear_C1();
+      loaded_tag = FPU_load_extended((long double __user *)data_address, 0);
+      FPU_settag0(loaded_tag);
+      break;
+    case 027:      /* fild m64int */
+      clear_C1();
+      loaded_tag = FPU_load_int64((long long __user *)data_address);
+      FPU_settag0(loaded_tag);
+      break;
+    case 030:     /* fstenv  m14/28byte */
+      fstenv(addr_modes, (u_char __user *)data_address);
+      return 1;
+    case 032:      /* fsave */
+      fsave(addr_modes, (u_char __user *)data_address);
+      return 1;
+    case 033:      /* fbstp m80dec */
+      clear_C1();
+      if ( FPU_store_bcd(st0_ptr, st0_tag, (u_char __user *)data_address) )
+        pop_0();  /* pop only if the number was actually stored
+                     (see the 80486 manual p16-28) */
+      break;
+    case 034:      /* fstcw m16int */
+      RE_ENTRANT_CHECK_OFF;
+      FPU_access_ok(VERIFY_WRITE,data_address,2);
+      FPU_put_user(control_word, (unsigned short __user *) data_address);
+      RE_ENTRANT_CHECK_ON;
+      return 1;
+    case 035:      /* fstp m80real */
+      clear_C1();
+      if ( FPU_store_extended(st0_ptr, st0_tag, (long double __user *)data_address) )
+        pop_0();  /* pop only if the number was actually stored
+                     (see the 80486 manual p16-28) */
+      break;
+    case 036:      /* fstsw m2byte */
+      RE_ENTRANT_CHECK_OFF;
+      FPU_access_ok(VERIFY_WRITE,data_address,2);
+      FPU_put_user(status_word(),(unsigned short __user *) data_address);
+      RE_ENTRANT_CHECK_ON;
+      return 1;
+    case 037:      /* fistp m64int */
+      clear_C1();
+      if ( FPU_store_int64(st0_ptr, st0_tag, (long long __user *)data_address) )
+        pop_0();  /* pop only if the number was actually stored
+                     (see the 80486 manual p16-28) */
+      break;
+    }
+  return 0;
+}
diff --git a/arch/i386/math-emu/mul_Xsig.S b/arch/i386/math-emu/mul_Xsig.S
new file mode 100644
index 000000000000..717785a53eb4
--- /dev/null
+++ b/arch/i386/math-emu/mul_Xsig.S
@@ -0,0 +1,176 @@
+/*---------------------------------------------------------------------------+
+ |  mul_Xsig.S                                                               |
+ |                                                                           |
+ | Multiply a 12 byte fixed point number by another fixed point number.      |
+ |                                                                           |
+ | Copyright (C) 1992,1994,1995                                              |
+ |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
+ |                       Australia.  E-mail billm@jacobi.maths.monash.edu.au |
+ |                                                                           |
+ | Call from C as:                                                           |
+ |   void mul32_Xsig(Xsig *x, unsigned b)                                    |
+ |                                                                           |
+ |   void mul64_Xsig(Xsig *x, unsigned long long *b)                         |
+ |                                                                           |
+ |   void mul_Xsig_Xsig(Xsig *x, unsigned *b)                                |
+ |                                                                           |
+ | The result is neither rounded nor normalized, and the ls bit or so may    |
+ | be wrong.                                                                 |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+        .file   "mul_Xsig.S"
+
+
+#include "fpu_emu.h"
+
+.text
+ENTRY(mul32_Xsig)
+        pushl %ebp
+        movl %esp,%ebp
+        subl $16,%esp
+        pushl %esi
+
+        movl PARAM1,%esi
+        movl PARAM2,%ecx
+
+        xor %eax,%eax
+        movl %eax,-4(%ebp)
+        movl %eax,-8(%ebp)
+
+        movl (%esi),%eax        /* lsl of Xsig */
+        mull %ecx               /* msl of b */
+        movl %edx,-12(%ebp)
+
+        movl 4(%esi),%eax       /* midl of Xsig */
+        mull %ecx               /* msl of b */
+        addl %eax,-12(%ebp)
+        adcl %edx,-8(%ebp)
+        adcl $0,-4(%ebp)
+
+        movl 8(%esi),%eax       /* msl of Xsig */
+        mull %ecx               /* msl of b */
+        addl %eax,-8(%ebp)
+        adcl %edx,-4(%ebp)
+
+        movl -12(%ebp),%eax
+        movl %eax,(%esi)
+        movl -8(%ebp),%eax
+        movl %eax,4(%esi)
+        movl -4(%ebp),%eax
+        movl %eax,8(%esi)
+
+        popl %esi
+        leave
+        ret
+
+
+ENTRY(mul64_Xsig)
+        pushl %ebp
+        movl %esp,%ebp
+        subl $16,%esp
+        pushl %esi
+
+        movl PARAM1,%esi
+        movl PARAM2,%ecx
+
+        xor %eax,%eax
+        movl %eax,-4(%ebp)
+        movl %eax,-8(%ebp)
+
+        movl (%esi),%eax        /* lsl of Xsig */
+        mull 4(%ecx)            /* msl of b */
+        movl %edx,-12(%ebp)
+
+        movl 4(%esi),%eax       /* midl of Xsig */
+        mull (%ecx)             /* lsl of b */
+        addl %edx,-12(%ebp)
+        adcl $0,-8(%ebp)
+        adcl $0,-4(%ebp)
+
+        movl 4(%esi),%eax       /* midl of Xsig */
+        mull 4(%ecx)            /* msl of b */
+        addl %eax,-12(%ebp)
+        adcl %edx,-8(%ebp)
+        adcl $0,-4(%ebp)
+
+        movl 8(%esi),%eax       /* msl of Xsig */
+        mull (%ecx)             /* lsl of b */
+        addl %eax,-12(%ebp)
+        adcl %edx,-8(%ebp)
+        adcl $0,-4(%ebp)
+
+        movl 8(%esi),%eax       /* msl of Xsig */
+        mull 4(%ecx)            /* msl of b */
+        addl %eax,-8(%ebp)
+        adcl %edx,-4(%ebp)
+
+        movl -12(%ebp),%eax
+        movl %eax,(%esi)
+        movl -8(%ebp),%eax
+        movl %eax,4(%esi)
+        movl -4(%ebp),%eax
+        movl %eax,8(%esi)
+
+        popl %esi
+        leave
+        ret
+
+
+
+ENTRY(mul_Xsig_Xsig)
+        pushl %ebp
+        movl %esp,%ebp
+        subl $16,%esp
+        pushl %esi
+
+        movl PARAM1,%esi
+        movl PARAM2,%ecx
+
+        xor %eax,%eax
+        movl %eax,-4(%ebp)
+        movl %eax,-8(%ebp)
+
+        movl (%esi),%eax        /* lsl of Xsig */
+        mull 8(%ecx)            /* msl of b */
+        movl %edx,-12(%ebp)
+
+        movl 4(%esi),%eax       /* midl of Xsig */
+        mull 4(%ecx)            /* midl of b */
+        addl %edx,-12(%ebp)
+        adcl $0,-8(%ebp)
+        adcl $0,-4(%ebp)
+
+        movl 8(%esi),%eax       /* msl of Xsig */
+        mull (%ecx)             /* lsl of b */
+        addl %edx,-12(%ebp)
+        adcl $0,-8(%ebp)
+        adcl $0,-4(%ebp)
+
+        movl 4(%esi),%eax       /* midl of Xsig */
+        mull 8(%ecx)            /* msl of b */
+        addl %eax,-12(%ebp)
+        adcl %edx,-8(%ebp)
+        adcl $0,-4(%ebp)
+
+        movl 8(%esi),%eax       /* msl of Xsig */
+        mull 4(%ecx)            /* midl of b */
+        addl %eax,-12(%ebp)
+        adcl %edx,-8(%ebp)
+        adcl $0,-4(%ebp)
+
+        movl 8(%esi),%eax       /* msl of Xsig */
+        mull 8(%ecx)            /* msl of b */
+        addl %eax,-8(%ebp)
+        adcl %edx,-4(%ebp)
+
+        movl -12(%ebp),%edx
+        movl %edx,(%esi)
+        movl -8(%ebp),%edx
+        movl %edx,4(%esi)
+        movl -4(%ebp),%edx
+        movl %edx,8(%esi)
+
+        popl %esi
+        leave
+        ret
+
diff --git a/arch/i386/math-emu/poly.h b/arch/i386/math-emu/poly.h
new file mode 100644
index 000000000000..4db798114923
--- /dev/null
+++ b/arch/i386/math-emu/poly.h
@@ -0,0 +1,121 @@
+/*---------------------------------------------------------------------------+
+ |  poly.h                                                                   |
+ |                                                                           |
+ |  Header file for the FPU-emu poly*.c source files.                        |
+ |                                                                           |
+ | Copyright (C) 1994,1999                                                   |
+ |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
+ |                       Australia.  E-mail   billm@melbpc.org.au            |
+ |                                                                           |
+ | Declarations and definitions for functions operating on Xsig (12-byte     |
+ | extended-significand) quantities.                                         |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+#ifndef _POLY_H
+#define _POLY_H
+
+/* This 12-byte structure is used to improve the accuracy of computation
+   of transcendental functions.
+   Intended to be used to get results better than 8-byte computation
+   allows. 9-byte would probably be sufficient.
+   */
+typedef struct {
+  unsigned long lsw;
+  unsigned long midw;
+  unsigned long msw;
+} Xsig;
+
+asmlinkage void mul64(unsigned long long const *a, unsigned long long const *b,
+                      unsigned long long *result);
+asmlinkage void polynomial_Xsig(Xsig *, const unsigned long long *x,
+                                const unsigned long long terms[], const int n);
+
+asmlinkage void mul32_Xsig(Xsig *, const unsigned long mult);
+asmlinkage void mul64_Xsig(Xsig *, const unsigned long long *mult);
+asmlinkage void mul_Xsig_Xsig(Xsig *dest, const Xsig *mult);
+
+asmlinkage void shr_Xsig(Xsig *, const int n);
+asmlinkage int round_Xsig(Xsig *);
+asmlinkage int norm_Xsig(Xsig *);
+asmlinkage void div_Xsig(Xsig *x1, const Xsig *x2, const Xsig *dest);
+
+/* Macro to extract the most significant 32 bits from a long long */
+#define LL_MSW(x)     (((unsigned long *)&x)[1])
+
+/* Macro to initialize an Xsig struct */
+#define MK_XSIG(a,b,c)     { c, b, a }
+
+/* Macro to access the 8 ms bytes of an Xsig as a long long */
+#define XSIG_LL(x)         (*(unsigned long long *)&x.midw)
+
+
+/*
+   Need to run gcc with optimizations on to get these to
+   actually be in-line.
+   */
+
+/* Multiply two fixed-point 32 bit numbers, producing a 32 bit result.
+   The answer is the ms word of the product. */
+/* Some versions of gcc make it difficult to stop eax from being clobbered.
+   Merely specifying that it is used doesn't work...
+ */
+static inline unsigned long mul_32_32(const unsigned long arg1,
+                                      const unsigned long arg2)
+{
+  int retval;
+  asm volatile ("mull %2; movl %%edx,%%eax" \
+                :"=a" (retval) \
+                :"0" (arg1), "g" (arg2) \
+                :"dx");
+  return retval;
+}
+
+
+/* Add the 12 byte Xsig x2 to Xsig dest, with no checks for overflow. */
+static inline void add_Xsig_Xsig(Xsig *dest, const Xsig *x2)
+{
+  asm volatile ("movl %1,%%edi; movl %2,%%esi;\n"
+                "movl (%%esi),%%eax; addl %%eax,(%%edi);\n"
+                "movl 4(%%esi),%%eax; adcl %%eax,4(%%edi);\n"
+                "movl 8(%%esi),%%eax; adcl %%eax,8(%%edi);\n"
+                 :"=g" (*dest):"g" (dest), "g" (x2)
+                 :"ax","si","di");
+}
+
+
+/* Add the 12 byte Xsig x2 to Xsig dest, adjust exp if overflow occurs. */
+/* Note: the constraints in the asm statement didn't always work properly
+   with gcc 2.5.8.  Changing from using edi to using ecx got around the
+   problem, but keep fingers crossed! */
+static inline void add_two_Xsig(Xsig *dest, const Xsig *x2, long int *exp)
+{
+  asm volatile ("movl %2,%%ecx; movl %3,%%esi;\n"
+                "movl (%%esi),%%eax; addl %%eax,(%%ecx);\n"
+                "movl 4(%%esi),%%eax; adcl %%eax,4(%%ecx);\n"
+                "movl 8(%%esi),%%eax; adcl %%eax,8(%%ecx);\n"
+                "jnc 0f;\n"
+                "rcrl 8(%%ecx); rcrl 4(%%ecx); rcrl (%%ecx)\n"
+                "movl %4,%%ecx; incl (%%ecx)\n"
+                "movl $1,%%eax; jmp 1f;\n"
+                "0: xorl %%eax,%%eax;\n"
+                "1:\n"
+                :"=g" (*exp), "=g" (*dest)
+                :"g" (dest), "g" (x2), "g" (exp)
+                :"cx","si","ax");
+}
+
+
+/* Negate (subtract from 1.0) the 12 byte Xsig */
+/* This is faster in a loop on my 386 than using the "neg" instruction. */
+static inline void negate_Xsig(Xsig *x)
+{
+  asm volatile("movl %1,%%esi;\n"
+               "xorl %%ecx,%%ecx;\n"
+               "movl %%ecx,%%eax; subl (%%esi),%%eax; movl %%eax,(%%esi);\n"
+               "movl %%ecx,%%eax; sbbl 4(%%esi),%%eax; movl %%eax,4(%%esi);\n"
+               "movl %%ecx,%%eax; sbbl 8(%%esi),%%eax; movl %%eax,8(%%esi);\n"
+               :"=g" (*x):"g" (x):"si","ax","cx");
+}
+
+#endif /* _POLY_H */
diff --git a/arch/i386/math-emu/poly_2xm1.c b/arch/i386/math-emu/poly_2xm1.c
new file mode 100644
index 000000000000..9766ad5e9743
--- /dev/null
+++ b/arch/i386/math-emu/poly_2xm1.c
@@ -0,0 +1,156 @@
+/*---------------------------------------------------------------------------+
+ |  poly_2xm1.c                                                              |
+ |                                                                           |
+ | Function to compute 2^x-1 by a polynomial approximation.                  |
+ |                                                                           |
+ | Copyright (C) 1992,1993,1994,1997                                         |
+ |                  W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia |
+ |                  E-mail   billm@suburbia.net                              |
+ |                                                                           |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+#include "exception.h"
+#include "reg_constant.h"
+#include "fpu_emu.h"
+#include "fpu_system.h"
+#include "control_w.h"
+#include "poly.h"
+
+
+#define HIPOWER 11
+static const unsigned long long lterms[HIPOWER] =
+{
+  0x0000000000000000LL,  /* This term done separately as 12 bytes */
+  0xf5fdeffc162c7543LL,
+  0x1c6b08d704a0bfa6LL,
+  0x0276556df749cc21LL,
+  0x002bb0ffcf14f6b8LL,
+  0x0002861225ef751cLL,
+  0x00001ffcbfcd5422LL,
+  0x00000162c005d5f1LL,
+  0x0000000da96ccb1bLL,
+  0x0000000078d1b897LL,
+  0x000000000422b029LL
+};
+
+static const Xsig hiterm = MK_XSIG(0xb17217f7, 0xd1cf79ab, 0xc8a39194);
+
+/* Four slices: 0.0 : 0.25 : 0.50 : 0.75 : 1.0,
+   These numbers are 2^(1/4), 2^(1/2), and 2^(3/4)
+ */
+static const Xsig shiftterm0 = MK_XSIG(0, 0, 0);
+static const Xsig shiftterm1 = MK_XSIG(0x9837f051, 0x8db8a96f, 0x46ad2318);
+static const Xsig shiftterm2 = MK_XSIG(0xb504f333, 0xf9de6484, 0x597d89b3);
+static const Xsig shiftterm3 = MK_XSIG(0xd744fcca, 0xd69d6af4, 0x39a68bb9);
+
+static const Xsig *shiftterm[] = { &shiftterm0, &shiftterm1,
+                                     &shiftterm2, &shiftterm3 };
+
+
+/*--- poly_2xm1() -----------------------------------------------------------+
+ | Requires st(0) which is TAG_Valid and < 1.                                |
+ +---------------------------------------------------------------------------*/
+int     poly_2xm1(u_char sign, FPU_REG *arg, FPU_REG *result)
+{
+  long int              exponent, shift;
+  unsigned long long    Xll;
+  Xsig                  accumulator, Denom, argSignif;
+  u_char                tag;
+
+  exponent = exponent16(arg);
+
+#ifdef PARANOID
+  if ( exponent >= 0 )          /* Don't want a |number| >= 1.0 */
+    {
+      /* Number negative, too large, or not Valid. */
+      EXCEPTION(EX_INTERNAL|0x127);
+      return 1;
+    }
+#endif /* PARANOID */
+
+  argSignif.lsw = 0;
+  XSIG_LL(argSignif) = Xll = significand(arg);
+
+  if ( exponent == -1 )
+    {
+      shift = (argSignif.msw & 0x40000000) ? 3 : 2;
+      /* subtract 0.5 or 0.75 */
+      exponent -= 2;
+      XSIG_LL(argSignif) <<= 2;
+      Xll <<= 2;
+    }
+  else if ( exponent == -2 )
+    {
+      shift = 1;
+      /* subtract 0.25 */
+      exponent--;
+      XSIG_LL(argSignif) <<= 1;
+      Xll <<= 1;
+    }
+  else
+    shift = 0;
+
+  if ( exponent < -2 )
+    {
+      /* Shift the argument right by the required places. */
+      if ( FPU_shrx(&Xll, -2-exponent) >= 0x80000000U )
+        Xll++;  /* round up */
+    }
+
+  accumulator.lsw = accumulator.midw = accumulator.msw = 0;
+  polynomial_Xsig(&accumulator, &Xll, lterms, HIPOWER-1);
+  mul_Xsig_Xsig(&accumulator, &argSignif);
+  shr_Xsig(&accumulator, 3);
+
+  mul_Xsig_Xsig(&argSignif, &hiterm);   /* The leading term */
+  add_two_Xsig(&accumulator, &argSignif, &exponent);
+
+  if ( shift )
+    {
+      /* The argument is large, use the identity:
+         f(x+a) = f(a) * (f(x) + 1) - 1;
+         */
+      shr_Xsig(&accumulator, - exponent);
+      accumulator.msw |= 0x80000000;      /* add 1.0 */
+      mul_Xsig_Xsig(&accumulator, shiftterm[shift]);
+      accumulator.msw &= 0x3fffffff;      /* subtract 1.0 */
+      exponent = 1;
+    }
+
+  if ( sign != SIGN_POS )
+    {
+      /* The argument is negative, use the identity:
+             f(-x) = -f(x) / (1 + f(x))
+         */
+      Denom.lsw = accumulator.lsw;
+      XSIG_LL(Denom) = XSIG_LL(accumulator);
+      if ( exponent < 0 )
+        shr_Xsig(&Denom, - exponent);
+      else if ( exponent > 0 )
+        {
+          /* exponent must be 1 here */
+          XSIG_LL(Denom) <<= 1;
+          if ( Denom.lsw & 0x80000000 )
+            XSIG_LL(Denom) |= 1;
+          (Denom.lsw) <<= 1;
+        }
+      Denom.msw |= 0x80000000;      /* add 1.0 */
+      div_Xsig(&accumulator, &Denom, &accumulator);
+    }
+
+  /* Convert to 64 bit signed-compatible */
+  exponent += round_Xsig(&accumulator);
+
+  result = &st(0);
+  significand(result) = XSIG_LL(accumulator);
+  setexponent16(result, exponent);
+
+  tag = FPU_round(result, 1, 0, FULL_PRECISION, sign);
+
+  setsign(result, sign);
+  FPU_settag0(tag);
+
+  return 0;
+
+}
diff --git a/arch/i386/math-emu/poly_atan.c b/arch/i386/math-emu/poly_atan.c
new file mode 100644
index 000000000000..82f702952f69
--- /dev/null
+++ b/arch/i386/math-emu/poly_atan.c
@@ -0,0 +1,229 @@
+/*---------------------------------------------------------------------------+
+ |  poly_atan.c                                                              |
+ |                                                                           |
+ | Compute the arctan of a FPU_REG, using a polynomial approximation.        |
+ |                                                                           |
+ | Copyright (C) 1992,1993,1994,1997                                         |
+ |                  W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia |
+ |                  E-mail   billm@suburbia.net                              |
+ |                                                                           |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+#include "exception.h"
+#include "reg_constant.h"
+#include "fpu_emu.h"
+#include "fpu_system.h"
+#include "status_w.h"
+#include "control_w.h"
+#include "poly.h"
+
+
+#define HIPOWERon       6       /* odd poly, negative terms */
+static const unsigned long long oddnegterms[HIPOWERon] =
+{
+  0x0000000000000000LL, /* Dummy (not for - 1.0) */
+  0x015328437f756467LL,
+  0x0005dda27b73dec6LL,
+  0x0000226bf2bfb91aLL,
+  0x000000ccc439c5f7LL,
+  0x0000000355438407LL
+} ;
+
+#define HIPOWERop       6       /* odd poly, positive terms */
+static const unsigned long long oddplterms[HIPOWERop] =
+{
+/*  0xaaaaaaaaaaaaaaabLL,  transferred to fixedpterm[] */
+  0x0db55a71875c9ac2LL,
+  0x0029fce2d67880b0LL,
+  0x0000dfd3908b4596LL,
+  0x00000550fd61dab4LL,
+  0x0000001c9422b3f9LL,
+  0x000000003e3301e1LL
+};
+
+static const unsigned long long denomterm = 0xebd9b842c5c53a0eLL;
+
+static const Xsig fixedpterm = MK_XSIG(0xaaaaaaaa, 0xaaaaaaaa, 0xaaaaaaaa);
+
+static const Xsig pi_signif = MK_XSIG(0xc90fdaa2, 0x2168c234, 0xc4c6628b);
+
+
+/*--- poly_atan() -----------------------------------------------------------+
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+void    poly_atan(FPU_REG *st0_ptr, u_char st0_tag,
+                  FPU_REG *st1_ptr, u_char st1_tag)
+{
+  u_char        transformed, inverted,
+                sign1, sign2;
+  int           exponent;
+  long int      dummy_exp;
+  Xsig          accumulator, Numer, Denom, accumulatore, argSignif,
+                argSq, argSqSq;
+  u_char        tag;
+  
+  sign1 = getsign(st0_ptr);
+  sign2 = getsign(st1_ptr);
+  if ( st0_tag == TAG_Valid )
+    {
+      exponent = exponent(st0_ptr);
+    }
+  else
+    {
+      /* This gives non-compatible stack contents... */
+      FPU_to_exp16(st0_ptr, st0_ptr);
+      exponent = exponent16(st0_ptr);
+    }
+  if ( st1_tag == TAG_Valid )
+    {
+      exponent -= exponent(st1_ptr);
+    }
+  else
+    {
+      /* This gives non-compatible stack contents... */
+      FPU_to_exp16(st1_ptr, st1_ptr);
+      exponent -= exponent16(st1_ptr);
+    }
+
+  if ( (exponent < 0) || ((exponent == 0) &&
+                          ((st0_ptr->sigh < st1_ptr->sigh) ||
+                           ((st0_ptr->sigh == st1_ptr->sigh) &&
+                            (st0_ptr->sigl < st1_ptr->sigl))) ) )
+    {
+      inverted = 1;
+      Numer.lsw = Denom.lsw = 0;
+      XSIG_LL(Numer) = significand(st0_ptr);
+      XSIG_LL(Denom) = significand(st1_ptr);
+    }
+  else
+    {
+      inverted = 0;
+      exponent = -exponent;
+      Numer.lsw = Denom.lsw = 0;
+      XSIG_LL(Numer) = significand(st1_ptr);
+      XSIG_LL(Denom) = significand(st0_ptr);
+     }
+  div_Xsig(&Numer, &Denom, &argSignif);
+  exponent += norm_Xsig(&argSignif);
+
+  if ( (exponent >= -1)
+      || ((exponent == -2) && (argSignif.msw > 0xd413ccd0)) )
+    {
+      /* The argument is greater than sqrt(2)-1 (=0.414213562...) */
+      /* Convert the argument by an identity for atan */
+      transformed = 1;
+
+      if ( exponent >= 0 )
+        {
+#ifdef PARANOID
+          if ( !( (exponent == 0) && 
+                 (argSignif.lsw == 0) && (argSignif.midw == 0) &&
+                 (argSignif.msw == 0x80000000) ) )
+            {
+              EXCEPTION(EX_INTERNAL|0x104);  /* There must be a logic error */
+              return;
+            }
+#endif /* PARANOID */
+          argSignif.msw = 0;   /* Make the transformed arg -> 0.0 */
+        }
+      else
+        {
+          Numer.lsw = Denom.lsw = argSignif.lsw;
+          XSIG_LL(Numer) = XSIG_LL(Denom) = XSIG_LL(argSignif);
+
+          if ( exponent < -1 )
+            shr_Xsig(&Numer, -1-exponent);
+          negate_Xsig(&Numer);
+      
+          shr_Xsig(&Denom, -exponent);
+          Denom.msw |= 0x80000000;
+      
+          div_Xsig(&Numer, &Denom, &argSignif);
+
+          exponent = -1 + norm_Xsig(&argSignif);
+        }
+    }
+  else
+    {
+      transformed = 0;
+    }
+
+  argSq.lsw = argSignif.lsw; argSq.midw = argSignif.midw;
+  argSq.msw = argSignif.msw;
+  mul_Xsig_Xsig(&argSq, &argSq);
+  
+  argSqSq.lsw = argSq.lsw; argSqSq.midw = argSq.midw; argSqSq.msw = argSq.msw;
+  mul_Xsig_Xsig(&argSqSq, &argSqSq);
+
+  accumulatore.lsw = argSq.lsw;
+  XSIG_LL(accumulatore) = XSIG_LL(argSq);
+
+  shr_Xsig(&argSq, 2*(-1-exponent-1));
+  shr_Xsig(&argSqSq, 4*(-1-exponent-1));
+
+  /* Now have argSq etc with binary point at the left
+     .1xxxxxxxx */
+
+  /* Do the basic fixed point polynomial evaluation */
+  accumulator.msw = accumulator.midw = accumulator.lsw = 0;
+  polynomial_Xsig(&accumulator, &XSIG_LL(argSqSq),
+                   oddplterms, HIPOWERop-1);
+  mul64_Xsig(&accumulator, &XSIG_LL(argSq));
+  negate_Xsig(&accumulator);
+  polynomial_Xsig(&accumulator, &XSIG_LL(argSqSq), oddnegterms, HIPOWERon-1);
+  negate_Xsig(&accumulator);
+  add_two_Xsig(&accumulator, &fixedpterm, &dummy_exp);
+
+  mul64_Xsig(&accumulatore, &denomterm);
+  shr_Xsig(&accumulatore, 1 + 2*(-1-exponent));
+  accumulatore.msw |= 0x80000000;
+
+  div_Xsig(&accumulator, &accumulatore, &accumulator);
+
+  mul_Xsig_Xsig(&accumulator, &argSignif);
+  mul_Xsig_Xsig(&accumulator, &argSq);
+
+  shr_Xsig(&accumulator, 3);
+  negate_Xsig(&accumulator);
+  add_Xsig_Xsig(&accumulator, &argSignif);
+
+  if ( transformed )
+    {
+      /* compute pi/4 - accumulator */
+      shr_Xsig(&accumulator, -1-exponent);
+      negate_Xsig(&accumulator);
+      add_Xsig_Xsig(&accumulator, &pi_signif);
+      exponent = -1;
+    }
+
+  if ( inverted )
+    {
+      /* compute pi/2 - accumulator */
+      shr_Xsig(&accumulator, -exponent);
+      negate_Xsig(&accumulator);
+      add_Xsig_Xsig(&accumulator, &pi_signif);
+      exponent = 0;
+    }
+
+  if ( sign1 )
+    {
+      /* compute pi - accumulator */
+      shr_Xsig(&accumulator, 1 - exponent);
+      negate_Xsig(&accumulator);
+      add_Xsig_Xsig(&accumulator, &pi_signif);
+      exponent = 1;
+    }
+
+  exponent += round_Xsig(&accumulator);
+
+  significand(st1_ptr) = XSIG_LL(accumulator);
+  setexponent16(st1_ptr, exponent);
+
+  tag = FPU_round(st1_ptr, 1, 0, FULL_PRECISION, sign2);
+  FPU_settagi(1, tag);
+
+  set_precision_flag_up();  /* We do not really know if up or down,
+                               use this as the default. */
+
+}
diff --git a/arch/i386/math-emu/poly_l2.c b/arch/i386/math-emu/poly_l2.c
new file mode 100644
index 000000000000..dd00e1d5b074
--- /dev/null
+++ b/arch/i386/math-emu/poly_l2.c
@@ -0,0 +1,272 @@
+/*---------------------------------------------------------------------------+
+ |  poly_l2.c                                                                |
+ |                                                                           |
+ | Compute the base 2 log of a FPU_REG, using a polynomial approximation.    |
+ |                                                                           |
+ | Copyright (C) 1992,1993,1994,1997                                         |
+ |                  W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia |
+ |                  E-mail   billm@suburbia.net                              |
+ |                                                                           |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+
+#include "exception.h"
+#include "reg_constant.h"
+#include "fpu_emu.h"
+#include "fpu_system.h"
+#include "control_w.h"
+#include "poly.h"
+
+
+static void log2_kernel(FPU_REG const *arg, u_char argsign,
+                        Xsig *accum_result, long int *expon);
+
+
+/*--- poly_l2() -------------------------------------------------------------+
+ |   Base 2 logarithm by a polynomial approximation.                         |
+ +---------------------------------------------------------------------------*/
+void    poly_l2(FPU_REG *st0_ptr, FPU_REG *st1_ptr, u_char st1_sign)
+{
+  long int             exponent, expon, expon_expon;
+  Xsig                 accumulator, expon_accum, yaccum;
+  u_char                       sign, argsign;
+  FPU_REG              x;
+  int                  tag;
+
+  exponent = exponent16(st0_ptr);
+
+  /* From st0_ptr, make a number > sqrt(2)/2 and < sqrt(2) */
+  if ( st0_ptr->sigh > (unsigned)0xb504f334 )
+    {
+      /* Treat as  sqrt(2)/2 < st0_ptr < 1 */
+      significand(&x) = - significand(st0_ptr);
+      setexponent16(&x, -1);
+      exponent++;
+      argsign = SIGN_NEG;
+    }
+  else
+    {
+      /* Treat as  1 <= st0_ptr < sqrt(2) */
+      x.sigh = st0_ptr->sigh - 0x80000000;
+      x.sigl = st0_ptr->sigl;
+      setexponent16(&x, 0);
+      argsign = SIGN_POS;
+    }
+  tag = FPU_normalize_nuo(&x);
+
+  if ( tag == TAG_Zero )
+    {
+      expon = 0;
+      accumulator.msw = accumulator.midw = accumulator.lsw = 0;
+    }
+  else
+    {
+      log2_kernel(&x, argsign, &accumulator, &expon);
+    }
+
+  if ( exponent < 0 )
+    {
+      sign = SIGN_NEG;
+      exponent = -exponent;
+    }
+  else
+    sign = SIGN_POS;
+  expon_accum.msw = exponent; expon_accum.midw = expon_accum.lsw = 0;
+  if ( exponent )
+    {
+      expon_expon = 31 + norm_Xsig(&expon_accum);
+      shr_Xsig(&accumulator, expon_expon - expon);
+
+      if ( sign ^ argsign )
+        negate_Xsig(&accumulator);
+      add_Xsig_Xsig(&accumulator, &expon_accum);
+    }
+  else
+    {
+      expon_expon = expon;
+      sign = argsign;
+    }
+
+  yaccum.lsw = 0; XSIG_LL(yaccum) = significand(st1_ptr);
+  mul_Xsig_Xsig(&accumulator, &yaccum);
+
+  expon_expon += round_Xsig(&accumulator);
+
+  if ( accumulator.msw == 0 )
+    {
+      FPU_copy_to_reg1(&CONST_Z, TAG_Zero);
+      return;
+    }
+
+  significand(st1_ptr) = XSIG_LL(accumulator);
+  setexponent16(st1_ptr, expon_expon + exponent16(st1_ptr) + 1);
+
+  tag = FPU_round(st1_ptr, 1, 0, FULL_PRECISION, sign ^ st1_sign);
+  FPU_settagi(1, tag);
+
+  set_precision_flag_up();  /* 80486 appears to always do this */
+
+  return;
+
+}
+
+
+/*--- poly_l2p1() -----------------------------------------------------------+
+ |   Base 2 logarithm by a polynomial approximation.                         |
+ |   log2(x+1)                                                               |
+ +---------------------------------------------------------------------------*/
+int     poly_l2p1(u_char sign0, u_char sign1,
+                  FPU_REG *st0_ptr, FPU_REG *st1_ptr, FPU_REG *dest)
+{
+  u_char                tag;
+  long int              exponent;
+  Xsig                  accumulator, yaccum;
+
+  if ( exponent16(st0_ptr) < 0 )
+    {
+      log2_kernel(st0_ptr, sign0, &accumulator, &exponent);
+
+      yaccum.lsw = 0;
+      XSIG_LL(yaccum) = significand(st1_ptr);
+      mul_Xsig_Xsig(&accumulator, &yaccum);
+
+      exponent += round_Xsig(&accumulator);
+
+      exponent += exponent16(st1_ptr) + 1;
+      if ( exponent < EXP_WAY_UNDER ) exponent = EXP_WAY_UNDER;
+
+      significand(dest) = XSIG_LL(accumulator);
+      setexponent16(dest, exponent);
+
+      tag = FPU_round(dest, 1, 0, FULL_PRECISION, sign0 ^ sign1);
+      FPU_settagi(1, tag);
+
+      if ( tag == TAG_Valid )
+        set_precision_flag_up();   /* 80486 appears to always do this */
+    }
+  else
+    {
+      /* The magnitude of st0_ptr is far too large. */
+
+      if ( sign0 != SIGN_POS )
+        {
+          /* Trying to get the log of a negative number. */
+#ifdef PECULIAR_486   /* Stupid 80486 doesn't worry about log(negative). */
+          changesign(st1_ptr);
+#else
+          if ( arith_invalid(1) < 0 )
+            return 1;
+#endif /* PECULIAR_486 */
+        }
+
+      /* 80486 appears to do this */
+      if ( sign0 == SIGN_NEG )
+        set_precision_flag_down();
+      else
+        set_precision_flag_up();
+    }
+
+  if ( exponent(dest) <= EXP_UNDER )
+    EXCEPTION(EX_Underflow);
+
+  return 0;
+
+}
+
+
+
+
+#undef HIPOWER
+#define HIPOWER 10
+static const unsigned long long logterms[HIPOWER] =
+{
+  0x2a8eca5705fc2ef0LL,
+  0xf6384ee1d01febceLL,
+  0x093bb62877cdf642LL,
+  0x006985d8a9ec439bLL,
+  0x0005212c4f55a9c8LL,
+  0x00004326a16927f0LL,
+  0x0000038d1d80a0e7LL,
+  0x0000003141cc80c6LL,
+  0x00000002b1668c9fLL,
+  0x000000002c7a46aaLL
+};
+
+static const unsigned long leadterm = 0xb8000000;
+
+
+/*--- log2_kernel() ---------------------------------------------------------+
+ |   Base 2 logarithm by a polynomial approximation.                         |
+ |   log2(x+1)                                                               |
+ +---------------------------------------------------------------------------*/
+static void log2_kernel(FPU_REG const *arg, u_char argsign, Xsig *accum_result,
+                        long int *expon)
+{
+  long int             exponent, adj;
+  unsigned long long   Xsq;
+  Xsig                 accumulator, Numer, Denom, argSignif, arg_signif;
+
+  exponent = exponent16(arg);
+  Numer.lsw = Denom.lsw = 0;
+  XSIG_LL(Numer) = XSIG_LL(Denom) = significand(arg);
+  if ( argsign == SIGN_POS )
+    {
+      shr_Xsig(&Denom, 2 - (1 + exponent));
+      Denom.msw |= 0x80000000;
+      div_Xsig(&Numer, &Denom, &argSignif);
+    }
+  else
+    {
+      shr_Xsig(&Denom, 1 - (1 + exponent));
+      negate_Xsig(&Denom);
+      if ( Denom.msw & 0x80000000 )
+        {
+          div_Xsig(&Numer, &Denom, &argSignif);
+          exponent ++;
+        }
+      else
+        {
+          /* Denom must be 1.0 */
+          argSignif.lsw = Numer.lsw; argSignif.midw = Numer.midw;
+          argSignif.msw = Numer.msw;
+        }
+    }
+
+#ifndef PECULIAR_486
+  /* Should check here that  |local_arg|  is within the valid range */
+  if ( exponent >= -2 )
+    {
+      if ( (exponent > -2) ||
+          (argSignif.msw > (unsigned)0xafb0ccc0) )
+        {
+          /* The argument is too large */
+        }
+    }
+#endif /* PECULIAR_486 */
+
+  arg_signif.lsw = argSignif.lsw; XSIG_LL(arg_signif) = XSIG_LL(argSignif);
+  adj = norm_Xsig(&argSignif);
+  accumulator.lsw = argSignif.lsw; XSIG_LL(accumulator) = XSIG_LL(argSignif);
+  mul_Xsig_Xsig(&accumulator, &accumulator);
+  shr_Xsig(&accumulator, 2*(-1 - (1 + exponent + adj)));
+  Xsq = XSIG_LL(accumulator);
+  if ( accumulator.lsw & 0x80000000 )
+    Xsq++;
+
+  accumulator.msw = accumulator.midw = accumulator.lsw = 0;
+  /* Do the basic fixed point polynomial evaluation */
+  polynomial_Xsig(&accumulator, &Xsq, logterms, HIPOWER-1);
+
+  mul_Xsig_Xsig(&accumulator, &argSignif);
+  shr_Xsig(&accumulator, 6 - adj);
+
+  mul32_Xsig(&arg_signif, leadterm);
+  add_two_Xsig(&accumulator, &arg_signif, &exponent);
+
+  *expon = exponent + 1;
+  accum_result->lsw = accumulator.lsw;
+  accum_result->midw = accumulator.midw;
+  accum_result->msw = accumulator.msw;
+
+}
diff --git a/arch/i386/math-emu/poly_sin.c b/arch/i386/math-emu/poly_sin.c
new file mode 100644
index 000000000000..a36313fb06f1
--- /dev/null
+++ b/arch/i386/math-emu/poly_sin.c
@@ -0,0 +1,397 @@
+/*---------------------------------------------------------------------------+
+ |  poly_sin.c                                                               |
+ |                                                                           |
+ |  Computation of an approximation of the sin function and the cosine       |
+ |  function by a polynomial.                                                |
+ |                                                                           |
+ | Copyright (C) 1992,1993,1994,1997,1999                                    |
+ |                  W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia |
+ |                  E-mail   billm@melbpc.org.au                             |
+ |                                                                           |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+
+#include "exception.h"
+#include "reg_constant.h"
+#include "fpu_emu.h"
+#include "fpu_system.h"
+#include "control_w.h"
+#include "poly.h"
+
+
+#define N_COEFF_P       4
+#define N_COEFF_N       4
+
+static const unsigned long long pos_terms_l[N_COEFF_P] =
+{
+  0xaaaaaaaaaaaaaaabLL,
+  0x00d00d00d00cf906LL,
+  0x000006b99159a8bbLL,
+  0x000000000d7392e6LL
+};
+
+static const unsigned long long neg_terms_l[N_COEFF_N] =
+{
+  0x2222222222222167LL,
+  0x0002e3bc74aab624LL,
+  0x0000000b09229062LL,
+  0x00000000000c7973LL
+};
+
+
+
+#define N_COEFF_PH      4
+#define N_COEFF_NH      4
+static const unsigned long long pos_terms_h[N_COEFF_PH] =
+{
+  0x0000000000000000LL,
+  0x05b05b05b05b0406LL,
+  0x000049f93edd91a9LL,
+  0x00000000c9c9ed62LL
+};
+
+static const unsigned long long neg_terms_h[N_COEFF_NH] =
+{
+  0xaaaaaaaaaaaaaa98LL,
+  0x001a01a01a019064LL,
+  0x0000008f76c68a77LL,
+  0x0000000000d58f5eLL
+};
+
+
+/*--- poly_sine() -----------------------------------------------------------+
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+void    poly_sine(FPU_REG *st0_ptr)
+{
+  int                 exponent, echange;
+  Xsig                accumulator, argSqrd, argTo4;
+  unsigned long       fix_up, adj;
+  unsigned long long  fixed_arg;
+  FPU_REG             result;
+
+  exponent = exponent(st0_ptr);
+
+  accumulator.lsw = accumulator.midw = accumulator.msw = 0;
+
+  /* Split into two ranges, for arguments below and above 1.0 */
+  /* The boundary between upper and lower is approx 0.88309101259 */
+  if ( (exponent < -1) || ((exponent == -1) && (st0_ptr->sigh <= 0xe21240aa)) )
+    {
+      /* The argument is <= 0.88309101259 */
+
+      argSqrd.msw = st0_ptr->sigh; argSqrd.midw = st0_ptr->sigl; argSqrd.lsw = 0;
+      mul64_Xsig(&argSqrd, &significand(st0_ptr));
+      shr_Xsig(&argSqrd, 2*(-1-exponent));
+      argTo4.msw = argSqrd.msw; argTo4.midw = argSqrd.midw;
+      argTo4.lsw = argSqrd.lsw;
+      mul_Xsig_Xsig(&argTo4, &argTo4);
+
+      polynomial_Xsig(&accumulator, &XSIG_LL(argTo4), neg_terms_l,
+                      N_COEFF_N-1);
+      mul_Xsig_Xsig(&accumulator, &argSqrd);
+      negate_Xsig(&accumulator);
+
+      polynomial_Xsig(&accumulator, &XSIG_LL(argTo4), pos_terms_l,
+                      N_COEFF_P-1);
+
+      shr_Xsig(&accumulator, 2);    /* Divide by four */
+      accumulator.msw |= 0x80000000;  /* Add 1.0 */
+
+      mul64_Xsig(&accumulator, &significand(st0_ptr));
+      mul64_Xsig(&accumulator, &significand(st0_ptr));
+      mul64_Xsig(&accumulator, &significand(st0_ptr));
+
+      /* Divide by four, FPU_REG compatible, etc */
+      exponent = 3*exponent;
+
+      /* The minimum exponent difference is 3 */
+      shr_Xsig(&accumulator, exponent(st0_ptr) - exponent);
+
+      negate_Xsig(&accumulator);
+      XSIG_LL(accumulator) += significand(st0_ptr);
+
+      echange = round_Xsig(&accumulator);
+
+      setexponentpos(&result, exponent(st0_ptr) + echange);
+    }
+  else
+    {
+      /* The argument is > 0.88309101259 */
+      /* We use sin(st(0)) = cos(pi/2-st(0)) */
+
+      fixed_arg = significand(st0_ptr);
+
+      if ( exponent == 0 )
+        {
+          /* The argument is >= 1.0 */
+
+          /* Put the binary point at the left. */
+          fixed_arg <<= 1;
+        }
+      /* pi/2 in hex is: 1.921fb54442d18469 898CC51701B839A2 52049C1 */
+      fixed_arg = 0x921fb54442d18469LL - fixed_arg;
+      /* There is a special case which arises due to rounding, to fix here. */
+      if ( fixed_arg == 0xffffffffffffffffLL )
+        fixed_arg = 0;
+
+      XSIG_LL(argSqrd) = fixed_arg; argSqrd.lsw = 0;
+      mul64_Xsig(&argSqrd, &fixed_arg);
+
+      XSIG_LL(argTo4) = XSIG_LL(argSqrd); argTo4.lsw = argSqrd.lsw;
+      mul_Xsig_Xsig(&argTo4, &argTo4);
+
+      polynomial_Xsig(&accumulator, &XSIG_LL(argTo4), neg_terms_h,
+                      N_COEFF_NH-1);
+      mul_Xsig_Xsig(&accumulator, &argSqrd);
+      negate_Xsig(&accumulator);
+
+      polynomial_Xsig(&accumulator, &XSIG_LL(argTo4), pos_terms_h,
+                      N_COEFF_PH-1);
+      negate_Xsig(&accumulator);
+
+      mul64_Xsig(&accumulator, &fixed_arg);
+      mul64_Xsig(&accumulator, &fixed_arg);
+
+      shr_Xsig(&accumulator, 3);
+      negate_Xsig(&accumulator);
+
+      add_Xsig_Xsig(&accumulator, &argSqrd);
+
+      shr_Xsig(&accumulator, 1);
+
+      accumulator.lsw |= 1;  /* A zero accumulator here would cause problems */
+      negate_Xsig(&accumulator);
+
+      /* The basic computation is complete. Now fix the answer to
+         compensate for the error due to the approximation used for
+         pi/2
+         */
+
+      /* This has an exponent of -65 */
+      fix_up = 0x898cc517;
+      /* The fix-up needs to be improved for larger args */
+      if ( argSqrd.msw & 0xffc00000 )
+        {
+          /* Get about 32 bit precision in these: */
+          fix_up -= mul_32_32(0x898cc517, argSqrd.msw) / 6;
+        }
+      fix_up = mul_32_32(fix_up, LL_MSW(fixed_arg));
+
+      adj = accumulator.lsw;    /* temp save */
+      accumulator.lsw -= fix_up;
+      if ( accumulator.lsw > adj )
+        XSIG_LL(accumulator) --;
+
+      echange = round_Xsig(&accumulator);
+
+      setexponentpos(&result, echange - 1);
+    }
+
+  significand(&result) = XSIG_LL(accumulator);
+  setsign(&result, getsign(st0_ptr));
+  FPU_copy_to_reg0(&result, TAG_Valid);
+
+#ifdef PARANOID
+  if ( (exponent(&result) >= 0)
+      && (significand(&result) > 0x8000000000000000LL) )
+    {
+      EXCEPTION(EX_INTERNAL|0x150);
+    }
+#endif /* PARANOID */
+
+}
+
+
+
+/*--- poly_cos() ------------------------------------------------------------+
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+void    poly_cos(FPU_REG *st0_ptr)
+{
+  FPU_REG             result;
+  long int            exponent, exp2, echange;
+  Xsig                accumulator, argSqrd, fix_up, argTo4;
+  unsigned long long  fixed_arg;
+
+#ifdef PARANOID
+  if ( (exponent(st0_ptr) > 0)
+      || ((exponent(st0_ptr) == 0)
+          && (significand(st0_ptr) > 0xc90fdaa22168c234LL)) )
+    {
+      EXCEPTION(EX_Invalid);
+      FPU_copy_to_reg0(&CONST_QNaN, TAG_Special);
+      return;
+    }
+#endif /* PARANOID */
+
+  exponent = exponent(st0_ptr);
+
+  accumulator.lsw = accumulator.midw = accumulator.msw = 0;
+
+  if ( (exponent < -1) || ((exponent == -1) && (st0_ptr->sigh <= 0xb00d6f54)) )
+    {
+      /* arg is < 0.687705 */
+
+      argSqrd.msw = st0_ptr->sigh; argSqrd.midw = st0_ptr->sigl;
+      argSqrd.lsw = 0;
+      mul64_Xsig(&argSqrd, &significand(st0_ptr));
+
+      if ( exponent < -1 )
+        {
+          /* shift the argument right by the required places */
+          shr_Xsig(&argSqrd, 2*(-1-exponent));
+        }
+
+      argTo4.msw = argSqrd.msw; argTo4.midw = argSqrd.midw;
+      argTo4.lsw = argSqrd.lsw;
+      mul_Xsig_Xsig(&argTo4, &argTo4);
+
+      polynomial_Xsig(&accumulator, &XSIG_LL(argTo4), neg_terms_h,
+                      N_COEFF_NH-1);
+      mul_Xsig_Xsig(&accumulator, &argSqrd);
+      negate_Xsig(&accumulator);
+
+      polynomial_Xsig(&accumulator, &XSIG_LL(argTo4), pos_terms_h,
+                      N_COEFF_PH-1);
+      negate_Xsig(&accumulator);
+
+      mul64_Xsig(&accumulator, &significand(st0_ptr));
+      mul64_Xsig(&accumulator, &significand(st0_ptr));
+      shr_Xsig(&accumulator, -2*(1+exponent));
+
+      shr_Xsig(&accumulator, 3);
+      negate_Xsig(&accumulator);
+
+      add_Xsig_Xsig(&accumulator, &argSqrd);
+
+      shr_Xsig(&accumulator, 1);
+
+      /* It doesn't matter if accumulator is all zero here, the
+         following code will work ok */
+      negate_Xsig(&accumulator);
+
+      if ( accumulator.lsw & 0x80000000 )
+        XSIG_LL(accumulator) ++;
+      if ( accumulator.msw == 0 )
+        {
+          /* The result is 1.0 */
+          FPU_copy_to_reg0(&CONST_1, TAG_Valid);
+          return;
+        }
+      else
+        {
+          significand(&result) = XSIG_LL(accumulator);
+      
+          /* will be a valid positive nr with expon = -1 */
+          setexponentpos(&result, -1);
+        }
+    }
+  else
+    {
+      fixed_arg = significand(st0_ptr);
+
+      if ( exponent == 0 )
+        {
+          /* The argument is >= 1.0 */
+
+          /* Put the binary point at the left. */
+          fixed_arg <<= 1;
+        }
+      /* pi/2 in hex is: 1.921fb54442d18469 898CC51701B839A2 52049C1 */
+      fixed_arg = 0x921fb54442d18469LL - fixed_arg;
+      /* There is a special case which arises due to rounding, to fix here. */
+      if ( fixed_arg == 0xffffffffffffffffLL )
+        fixed_arg = 0;
+
+      exponent = -1;
+      exp2 = -1;
+
+      /* A shift is needed here only for a narrow range of arguments,
+         i.e. for fixed_arg approx 2^-32, but we pick up more... */
+      if ( !(LL_MSW(fixed_arg) & 0xffff0000) )
+        {
+          fixed_arg <<= 16;
+          exponent -= 16;
+          exp2 -= 16;
+        }
+
+      XSIG_LL(argSqrd) = fixed_arg; argSqrd.lsw = 0;
+      mul64_Xsig(&argSqrd, &fixed_arg);
+
+      if ( exponent < -1 )
+        {
+          /* shift the argument right by the required places */
+          shr_Xsig(&argSqrd, 2*(-1-exponent));
+        }
+
+      argTo4.msw = argSqrd.msw; argTo4.midw = argSqrd.midw;
+      argTo4.lsw = argSqrd.lsw;
+      mul_Xsig_Xsig(&argTo4, &argTo4);
+
+      polynomial_Xsig(&accumulator, &XSIG_LL(argTo4), neg_terms_l,
+                      N_COEFF_N-1);
+      mul_Xsig_Xsig(&accumulator, &argSqrd);
+      negate_Xsig(&accumulator);
+
+      polynomial_Xsig(&accumulator, &XSIG_LL(argTo4), pos_terms_l,
+                      N_COEFF_P-1);
+
+      shr_Xsig(&accumulator, 2);    /* Divide by four */
+      accumulator.msw |= 0x80000000;  /* Add 1.0 */
+
+      mul64_Xsig(&accumulator, &fixed_arg);
+      mul64_Xsig(&accumulator, &fixed_arg);
+      mul64_Xsig(&accumulator, &fixed_arg);
+
+      /* Divide by four, FPU_REG compatible, etc */
+      exponent = 3*exponent;
+
+      /* The minimum exponent difference is 3 */
+      shr_Xsig(&accumulator, exp2 - exponent);
+
+      negate_Xsig(&accumulator);
+      XSIG_LL(accumulator) += fixed_arg;
+
+      /* The basic computation is complete. Now fix the answer to
+         compensate for the error due to the approximation used for
+         pi/2
+         */
+
+      /* This has an exponent of -65 */
+      XSIG_LL(fix_up) = 0x898cc51701b839a2ll;
+      fix_up.lsw = 0;
+
+      /* The fix-up needs to be improved for larger args */
+      if ( argSqrd.msw & 0xffc00000 )
+        {
+          /* Get about 32 bit precision in these: */
+          fix_up.msw -= mul_32_32(0x898cc517, argSqrd.msw) / 2;
+          fix_up.msw += mul_32_32(0x898cc517, argTo4.msw) / 24;
+        }
+
+      exp2 += norm_Xsig(&accumulator);
+      shr_Xsig(&accumulator, 1); /* Prevent overflow */
+      exp2++;
+      shr_Xsig(&fix_up, 65 + exp2);
+
+      add_Xsig_Xsig(&accumulator, &fix_up);
+
+      echange = round_Xsig(&accumulator);
+
+      setexponentpos(&result, exp2 + echange);
+      significand(&result) = XSIG_LL(accumulator);
+    }
+
+  FPU_copy_to_reg0(&result, TAG_Valid);
+
+#ifdef PARANOID
+  if ( (exponent(&result) >= 0)
+      && (significand(&result) > 0x8000000000000000LL) )
+    {
+      EXCEPTION(EX_INTERNAL|0x151);
+    }
+#endif /* PARANOID */
+
+}
diff --git a/arch/i386/math-emu/poly_tan.c b/arch/i386/math-emu/poly_tan.c
new file mode 100644
index 000000000000..8df3e03b6e6f
--- /dev/null
+++ b/arch/i386/math-emu/poly_tan.c
@@ -0,0 +1,222 @@
+/*---------------------------------------------------------------------------+
+ |  poly_tan.c                                                               |
+ |                                                                           |
+ | Compute the tan of a FPU_REG, using a polynomial approximation.           |
+ |                                                                           |
+ | Copyright (C) 1992,1993,1994,1997,1999                                    |
+ |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
+ |                       Australia.  E-mail   billm@melbpc.org.au            |
+ |                                                                           |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+#include "exception.h"
+#include "reg_constant.h"
+#include "fpu_emu.h"
+#include "fpu_system.h"
+#include "control_w.h"
+#include "poly.h"
+
+
+#define HiPOWERop       3       /* odd poly, positive terms */
+static const unsigned long long oddplterm[HiPOWERop] =
+{
+  0x0000000000000000LL,
+  0x0051a1cf08fca228LL,
+  0x0000000071284ff7LL
+};
+
+#define HiPOWERon       2       /* odd poly, negative terms */
+static const unsigned long long oddnegterm[HiPOWERon] =
+{
+   0x1291a9a184244e80LL,
+   0x0000583245819c21LL
+};
+
+#define HiPOWERep       2       /* even poly, positive terms */
+static const unsigned long long evenplterm[HiPOWERep] =
+{
+  0x0e848884b539e888LL,
+  0x00003c7f18b887daLL
+};
+
+#define HiPOWERen       2       /* even poly, negative terms */
+static const unsigned long long evennegterm[HiPOWERen] =
+{
+  0xf1f0200fd51569ccLL,
+  0x003afb46105c4432LL
+};
+
+static const unsigned long long twothirds = 0xaaaaaaaaaaaaaaabLL;
+
+
+/*--- poly_tan() ------------------------------------------------------------+
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+void    poly_tan(FPU_REG *st0_ptr)
+{
+  long int              exponent;
+  int                   invert;
+  Xsig                  argSq, argSqSq, accumulatoro, accumulatore, accum,
+                        argSignif, fix_up;
+  unsigned long         adj;
+
+  exponent = exponent(st0_ptr);
+
+#ifdef PARANOID
+  if ( signnegative(st0_ptr) )  /* Can't hack a number < 0.0 */
+    { arith_invalid(0); return; }  /* Need a positive number */
+#endif /* PARANOID */
+
+  /* Split the problem into two domains, smaller and larger than pi/4 */
+  if ( (exponent == 0) || ((exponent == -1) && (st0_ptr->sigh > 0xc90fdaa2)) )
+    {
+      /* The argument is greater than (approx) pi/4 */
+      invert = 1;
+      accum.lsw = 0;
+      XSIG_LL(accum) = significand(st0_ptr);
+ 
+      if ( exponent == 0 )
+        {
+          /* The argument is >= 1.0 */
+          /* Put the binary point at the left. */
+          XSIG_LL(accum) <<= 1;
+        }
+      /* pi/2 in hex is: 1.921fb54442d18469 898CC51701B839A2 52049C1 */
+      XSIG_LL(accum) = 0x921fb54442d18469LL - XSIG_LL(accum);
+      /* This is a special case which arises due to rounding. */
+      if ( XSIG_LL(accum) == 0xffffffffffffffffLL )
+        {
+          FPU_settag0(TAG_Valid);
+          significand(st0_ptr) = 0x8a51e04daabda360LL;
+          setexponent16(st0_ptr, (0x41 + EXTENDED_Ebias) | SIGN_Negative);
+          return;
+        }
+
+      argSignif.lsw = accum.lsw;
+      XSIG_LL(argSignif) = XSIG_LL(accum);
+      exponent = -1 + norm_Xsig(&argSignif);
+    }
+  else
+    {
+      invert = 0;
+      argSignif.lsw = 0;
+      XSIG_LL(accum) = XSIG_LL(argSignif) = significand(st0_ptr);
+ 
+      if ( exponent < -1 )
+        {
+          /* shift the argument right by the required places */
+          if ( FPU_shrx(&XSIG_LL(accum), -1-exponent) >= 0x80000000U )
+            XSIG_LL(accum) ++;  /* round up */
+        }
+    }
+
+  XSIG_LL(argSq) = XSIG_LL(accum); argSq.lsw = accum.lsw;
+  mul_Xsig_Xsig(&argSq, &argSq);
+  XSIG_LL(argSqSq) = XSIG_LL(argSq); argSqSq.lsw = argSq.lsw;
+  mul_Xsig_Xsig(&argSqSq, &argSqSq);
+
+  /* Compute the negative terms for the numerator polynomial */
+  accumulatoro.msw = accumulatoro.midw = accumulatoro.lsw = 0;
+  polynomial_Xsig(&accumulatoro, &XSIG_LL(argSqSq), oddnegterm, HiPOWERon-1);
+  mul_Xsig_Xsig(&accumulatoro, &argSq);
+  negate_Xsig(&accumulatoro);
+  /* Add the positive terms */
+  polynomial_Xsig(&accumulatoro, &XSIG_LL(argSqSq), oddplterm, HiPOWERop-1);
+
+  
+  /* Compute the positive terms for the denominator polynomial */
+  accumulatore.msw = accumulatore.midw = accumulatore.lsw = 0;
+  polynomial_Xsig(&accumulatore, &XSIG_LL(argSqSq), evenplterm, HiPOWERep-1);
+  mul_Xsig_Xsig(&accumulatore, &argSq);
+  negate_Xsig(&accumulatore);
+  /* Add the negative terms */
+  polynomial_Xsig(&accumulatore, &XSIG_LL(argSqSq), evennegterm, HiPOWERen-1);
+  /* Multiply by arg^2 */
+  mul64_Xsig(&accumulatore, &XSIG_LL(argSignif));
+  mul64_Xsig(&accumulatore, &XSIG_LL(argSignif));
+  /* de-normalize and divide by 2 */
+  shr_Xsig(&accumulatore, -2*(1+exponent) + 1);
+  negate_Xsig(&accumulatore);      /* This does 1 - accumulator */
+
+  /* Now find the ratio. */
+  if ( accumulatore.msw == 0 )
+    {
+      /* accumulatoro must contain 1.0 here, (actually, 0) but it
+         really doesn't matter what value we use because it will
+         have negligible effect in later calculations
+         */
+      XSIG_LL(accum) = 0x8000000000000000LL;
+      accum.lsw = 0;
+    }
+  else
+    {
+      div_Xsig(&accumulatoro, &accumulatore, &accum);
+    }
+
+  /* Multiply by 1/3 * arg^3 */
+  mul64_Xsig(&accum, &XSIG_LL(argSignif));
+  mul64_Xsig(&accum, &XSIG_LL(argSignif));
+  mul64_Xsig(&accum, &XSIG_LL(argSignif));
+  mul64_Xsig(&accum, &twothirds);
+  shr_Xsig(&accum, -2*(exponent+1));
+
+  /* tan(arg) = arg + accum */
+  add_two_Xsig(&accum, &argSignif, &exponent);
+
+  if ( invert )
+    {
+      /* We now have the value of tan(pi_2 - arg) where pi_2 is an
+         approximation for pi/2
+         */
+      /* The next step is to fix the answer to compensate for the
+         error due to the approximation used for pi/2
+         */
+
+      /* This is (approx) delta, the error in our approx for pi/2
+         (see above). It has an exponent of -65
+         */
+      XSIG_LL(fix_up) = 0x898cc51701b839a2LL;
+      fix_up.lsw = 0;
+
+      if ( exponent == 0 )
+        adj = 0xffffffff;   /* We want approx 1.0 here, but
+                               this is close enough. */
+      else if ( exponent > -30 )
+        {
+          adj = accum.msw >> -(exponent+1);      /* tan */
+          adj = mul_32_32(adj, adj);             /* tan^2 */
+        }
+      else
+        adj = 0;
+      adj = mul_32_32(0x898cc517, adj);          /* delta * tan^2 */
+
+      fix_up.msw += adj;
+      if ( !(fix_up.msw & 0x80000000) )   /* did fix_up overflow ? */
+        {
+          /* Yes, we need to add an msb */
+          shr_Xsig(&fix_up, 1);
+          fix_up.msw |= 0x80000000;
+          shr_Xsig(&fix_up, 64 + exponent);
+        }
+      else
+        shr_Xsig(&fix_up, 65 + exponent);
+
+      add_two_Xsig(&accum, &fix_up, &exponent);
+
+      /* accum now contains tan(pi/2 - arg).
+         Use tan(arg) = 1.0 / tan(pi/2 - arg)
+         */
+      accumulatoro.lsw = accumulatoro.midw = 0;
+      accumulatoro.msw = 0x80000000;
+      div_Xsig(&accumulatoro, &accum, &accum);
+      exponent = - exponent - 1;
+    }
+
+  /* Transfer the result */
+  round_Xsig(&accum);
+  FPU_settag0(TAG_Valid);
+  significand(st0_ptr) = XSIG_LL(accum);
+  setexponent16(st0_ptr, exponent + EXTENDED_Ebias);  /* Result is positive. */
+
+}
diff --git a/arch/i386/math-emu/polynom_Xsig.S b/arch/i386/math-emu/polynom_Xsig.S
new file mode 100644
index 000000000000..17315c89ff3d
--- /dev/null
+++ b/arch/i386/math-emu/polynom_Xsig.S
@@ -0,0 +1,135 @@
+/*---------------------------------------------------------------------------+
+ |  polynomial_Xsig.S                                                        |
+ |                                                                           |
+ | Fixed point arithmetic polynomial evaluation.                             |
+ |                                                                           |
+ | Copyright (C) 1992,1993,1994,1995                                         |
+ |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
+ |                       Australia.  E-mail billm@jacobi.maths.monash.edu.au |
+ |                                                                           |
+ | Call from C as:                                                           |
+ |   void polynomial_Xsig(Xsig *accum, unsigned long long x,                 |
+ |                        unsigned long long terms[], int n)                 |
+ |                                                                           |
+ | Computes:                                                                 |
+ | terms[0] + (terms[1] + (terms[2] + ... + (terms[n-1]*x)*x)*x)*x) ... )*x  |
+ | and adds the result to the 12 byte Xsig.                                  |
+ | The terms[] are each 8 bytes, but all computation is performed to 12 byte |
+ | precision.                                                                |
+ |                                                                           |
+ | This function must be used carefully: most overflow of intermediate       |
+ | results is controlled, but overflow of the result is not.                 |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+        .file   "polynomial_Xsig.S"
+
+#include "fpu_emu.h"
+
+
+#define TERM_SIZE       $8
+#define SUM_MS          -20(%ebp)       /* sum ms long */
+#define SUM_MIDDLE      -24(%ebp)       /* sum middle long */
+#define SUM_LS          -28(%ebp)       /* sum ls long */
+#define ACCUM_MS        -4(%ebp)        /* accum ms long */
+#define ACCUM_MIDDLE    -8(%ebp)        /* accum middle long */
+#define ACCUM_LS        -12(%ebp)       /* accum ls long */
+#define OVERFLOWED      -16(%ebp)       /* addition overflow flag */
+
+.text
+ENTRY(polynomial_Xsig)
+        pushl   %ebp
+        movl    %esp,%ebp
+        subl    $32,%esp
+        pushl   %esi
+        pushl   %edi
+        pushl   %ebx
+
+        movl    PARAM2,%esi             /* x */
+        movl    PARAM3,%edi             /* terms */
+
+        movl    TERM_SIZE,%eax
+        mull    PARAM4                  /* n */
+        addl    %eax,%edi
+
+        movl    4(%edi),%edx            /* terms[n] */
+        movl    %edx,SUM_MS
+        movl    (%edi),%edx             /* terms[n] */
+        movl    %edx,SUM_MIDDLE
+        xor     %eax,%eax
+        movl    %eax,SUM_LS
+        movb    %al,OVERFLOWED
+
+        subl    TERM_SIZE,%edi
+        decl    PARAM4
+        js      L_accum_done
+
+L_accum_loop:
+        xor     %eax,%eax
+        movl    %eax,ACCUM_MS
+        movl    %eax,ACCUM_MIDDLE
+
+        movl    SUM_MIDDLE,%eax
+        mull    (%esi)                  /* x ls long */
+        movl    %edx,ACCUM_LS
+
+        movl    SUM_MIDDLE,%eax
+        mull    4(%esi)                 /* x ms long */
+        addl    %eax,ACCUM_LS
+        adcl    %edx,ACCUM_MIDDLE
+        adcl    $0,ACCUM_MS
+
+        movl    SUM_MS,%eax
+        mull    (%esi)                  /* x ls long */
+        addl    %eax,ACCUM_LS
+        adcl    %edx,ACCUM_MIDDLE
+        adcl    $0,ACCUM_MS
+
+        movl    SUM_MS,%eax
+        mull    4(%esi)                 /* x ms long */
+        addl    %eax,ACCUM_MIDDLE
+        adcl    %edx,ACCUM_MS
+
+        testb   $0xff,OVERFLOWED
+        jz      L_no_overflow
+
+        movl    (%esi),%eax
+        addl    %eax,ACCUM_MIDDLE
+        movl    4(%esi),%eax
+        adcl    %eax,ACCUM_MS           /* This could overflow too */
+
+L_no_overflow:
+
+/*
+ * Now put the sum of next term and the accumulator
+ * into the sum register
+ */
+        movl    ACCUM_LS,%eax
+        addl    (%edi),%eax             /* term ls long */
+        movl    %eax,SUM_LS
+        movl    ACCUM_MIDDLE,%eax
+        adcl    (%edi),%eax             /* term ls long */
+        movl    %eax,SUM_MIDDLE
+        movl    ACCUM_MS,%eax
+        adcl    4(%edi),%eax            /* term ms long */
+        movl    %eax,SUM_MS
+        sbbb    %al,%al
+        movb    %al,OVERFLOWED          /* Used in the next iteration */
+
+        subl    TERM_SIZE,%edi
+        decl    PARAM4
+        jns     L_accum_loop
+
+L_accum_done:
+        movl    PARAM1,%edi             /* accum */
+        movl    SUM_LS,%eax
+        addl    %eax,(%edi)
+        movl    SUM_MIDDLE,%eax
+        adcl    %eax,4(%edi)
+        movl    SUM_MS,%eax
+        adcl    %eax,8(%edi)
+
+        popl    %ebx
+        popl    %edi
+        popl    %esi
+        leave
+        ret
diff --git a/arch/i386/math-emu/reg_add_sub.c b/arch/i386/math-emu/reg_add_sub.c
new file mode 100644
index 000000000000..7cd3b37ac084
--- /dev/null
+++ b/arch/i386/math-emu/reg_add_sub.c
@@ -0,0 +1,374 @@
+/*---------------------------------------------------------------------------+
+ |  reg_add_sub.c                                                            |
+ |                                                                           |
+ | Functions to add or subtract two registers and put the result in a third. |
+ |                                                                           |
+ | Copyright (C) 1992,1993,1997                                              |
+ |                  W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia |
+ |                  E-mail   billm@suburbia.net                              |
+ |                                                                           |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------+
+ |  For each function, the destination may be any FPU_REG, including one of  |
+ | the source FPU_REGs.                                                      |
+ |  Each function returns 0 if the answer is o.k., otherwise a non-zero      |
+ | value is returned, indicating either an exception condition or an         |
+ | internal error.                                                           |
+ +---------------------------------------------------------------------------*/
+
+#include "exception.h"
+#include "reg_constant.h"
+#include "fpu_emu.h"
+#include "control_w.h"
+#include "fpu_system.h"
+
+static
+int add_sub_specials(FPU_REG const *a, u_char taga, u_char signa,
+                     FPU_REG const *b, u_char tagb, u_char signb,
+                     FPU_REG *dest, int deststnr, int control_w);
+
+/*
+  Operates on st(0) and st(n), or on st(0) and temporary data.
+  The destination must be one of the source st(x).
+  */
+int FPU_add(FPU_REG const *b, u_char tagb, int deststnr, int control_w)
+{
+  FPU_REG *a = &st(0);
+  FPU_REG *dest = &st(deststnr);
+  u_char signb = getsign(b);
+  u_char taga = FPU_gettag0();
+  u_char signa = getsign(a);
+  u_char saved_sign = getsign(dest);
+  int diff, tag, expa, expb;
+  
+  if ( !(taga | tagb) )
+    {
+      expa = exponent(a);
+      expb = exponent(b);
+
+    valid_add:
+      /* Both registers are valid */
+      if (!(signa ^ signb))
+        {
+          /* signs are the same */
+          tag = FPU_u_add(a, b, dest, control_w, signa, expa, expb);
+        }
+      else
+        {
+          /* The signs are different, so do a subtraction */
+          diff = expa - expb;
+          if (!diff)
+            {
+              diff = a->sigh - b->sigh;  /* This works only if the ms bits
+                                            are identical. */
+              if (!diff)
+                {
+                  diff = a->sigl > b->sigl;
+                  if (!diff)
+                    diff = -(a->sigl < b->sigl);
+                }
+            }
+      
+          if (diff > 0)
+            {
+              tag = FPU_u_sub(a, b, dest, control_w, signa, expa, expb);
+            }
+          else if ( diff < 0 )
+            {
+              tag = FPU_u_sub(b, a, dest, control_w, signb, expb, expa);
+            }
+          else
+            {
+              FPU_copy_to_regi(&CONST_Z, TAG_Zero, deststnr);
+              /* sign depends upon rounding mode */
+              setsign(dest, ((control_w & CW_RC) != RC_DOWN)
+                      ? SIGN_POS : SIGN_NEG);
+              return TAG_Zero;
+            }
+        }
+
+      if ( tag < 0 )
+        {
+          setsign(dest, saved_sign);
+          return tag;
+        }
+      FPU_settagi(deststnr, tag);
+      return tag;
+    }
+
+  if ( taga == TAG_Special )
+    taga = FPU_Special(a);
+  if ( tagb == TAG_Special )
+    tagb = FPU_Special(b);
+
+  if ( ((taga == TAG_Valid) && (tagb == TW_Denormal))
+            || ((taga == TW_Denormal) && (tagb == TAG_Valid))
+            || ((taga == TW_Denormal) && (tagb == TW_Denormal)) )
+    {
+      FPU_REG x, y;
+
+      if ( denormal_operand() < 0 )
+        return FPU_Exception;
+
+      FPU_to_exp16(a, &x);
+      FPU_to_exp16(b, &y);
+      a = &x;
+      b = &y;
+      expa = exponent16(a);
+      expb = exponent16(b);
+      goto valid_add;
+    }
+
+  if ( (taga == TW_NaN) || (tagb == TW_NaN) )
+    {
+      if ( deststnr == 0 )
+        return real_2op_NaN(b, tagb, deststnr, a);
+      else
+        return real_2op_NaN(a, taga, deststnr, a);
+    }
+
+  return add_sub_specials(a, taga, signa, b, tagb, signb,
+                          dest, deststnr, control_w);
+}
+
+
+/* Subtract b from a.  (a-b) -> dest */
+int FPU_sub(int flags, int rm, int control_w)
+{
+  FPU_REG const *a, *b;
+  FPU_REG *dest;
+  u_char taga, tagb, signa, signb, saved_sign, sign;
+  int diff, tag = 0, expa, expb, deststnr;
+
+  a = &st(0);
+  taga = FPU_gettag0();
+
+  deststnr = 0;
+  if ( flags & LOADED )
+    {
+      b = (FPU_REG *)rm;
+      tagb = flags & 0x0f;
+    }
+  else
+    {
+      b = &st(rm);
+      tagb = FPU_gettagi(rm);
+
+      if ( flags & DEST_RM )
+        deststnr = rm;
+    }
+
+  signa = getsign(a);
+  signb = getsign(b);
+
+  if ( flags & REV )
+    {
+      signa ^= SIGN_NEG;
+      signb ^= SIGN_NEG;
+    }
+
+  dest = &st(deststnr);
+  saved_sign = getsign(dest);
+
+  if ( !(taga | tagb) )
+    {
+      expa = exponent(a);
+      expb = exponent(b);
+
+    valid_subtract:
+      /* Both registers are valid */
+
+      diff = expa - expb;
+
+      if (!diff)
+        {
+          diff = a->sigh - b->sigh;  /* Works only if ms bits are identical */
+          if (!diff)
+            {
+              diff = a->sigl > b->sigl;
+              if (!diff)
+                diff = -(a->sigl < b->sigl);
+            }
+        }
+
+      switch ( (((int)signa)*2 + signb) / SIGN_NEG )
+        {
+        case 0: /* P - P */
+        case 3: /* N - N */
+          if (diff > 0)
+            {
+              /* |a| > |b| */
+              tag = FPU_u_sub(a, b, dest, control_w, signa, expa, expb);
+            }
+          else if ( diff == 0 )
+            {
+              FPU_copy_to_regi(&CONST_Z, TAG_Zero, deststnr);
+
+              /* sign depends upon rounding mode */
+              setsign(dest, ((control_w & CW_RC) != RC_DOWN)
+                ? SIGN_POS : SIGN_NEG);
+              return TAG_Zero;
+            }
+          else
+            {
+              sign = signa ^ SIGN_NEG;
+              tag = FPU_u_sub(b, a, dest, control_w, sign, expb, expa);
+            }
+          break;
+        case 1: /* P - N */
+          tag = FPU_u_add(a, b, dest, control_w, SIGN_POS, expa, expb);
+          break;
+        case 2: /* N - P */
+          tag = FPU_u_add(a, b, dest, control_w, SIGN_NEG, expa, expb);
+          break;
+#ifdef PARANOID
+        default:
+          EXCEPTION(EX_INTERNAL|0x111);
+          return -1;
+#endif
+        }
+      if ( tag < 0 )
+        {
+          setsign(dest, saved_sign);
+          return tag;
+        }
+      FPU_settagi(deststnr, tag);
+      return tag;
+    }
+
+  if ( taga == TAG_Special )
+    taga = FPU_Special(a);
+  if ( tagb == TAG_Special )
+    tagb = FPU_Special(b);
+
+  if ( ((taga == TAG_Valid) && (tagb == TW_Denormal))
+            || ((taga == TW_Denormal) && (tagb == TAG_Valid))
+            || ((taga == TW_Denormal) && (tagb == TW_Denormal)) )
+    {
+      FPU_REG x, y;
+
+      if ( denormal_operand() < 0 )
+        return FPU_Exception;
+
+      FPU_to_exp16(a, &x);
+      FPU_to_exp16(b, &y);
+      a = &x;
+      b = &y;
+      expa = exponent16(a);
+      expb = exponent16(b);
+
+      goto valid_subtract;
+    }
+
+  if ( (taga == TW_NaN) || (tagb == TW_NaN) )
+    {
+      FPU_REG const *d1, *d2;
+      if ( flags & REV )
+        {
+          d1 = b;
+          d2 = a;
+        }
+      else
+        {
+          d1 = a;
+          d2 = b;
+        }
+      if ( flags & LOADED )
+        return real_2op_NaN(b, tagb, deststnr, d1);
+      if ( flags & DEST_RM )
+        return real_2op_NaN(a, taga, deststnr, d2);
+      else
+        return real_2op_NaN(b, tagb, deststnr, d2);
+    }
+
+    return add_sub_specials(a, taga, signa, b, tagb, signb ^ SIGN_NEG,
+                            dest, deststnr, control_w);
+}
+
+
+static
+int add_sub_specials(FPU_REG const *a, u_char taga, u_char signa,
+                     FPU_REG const *b, u_char tagb, u_char signb,
+                     FPU_REG *dest, int deststnr, int control_w)
+{
+  if ( ((taga == TW_Denormal) || (tagb == TW_Denormal))
+       && (denormal_operand() < 0) )
+    return FPU_Exception;
+
+  if (taga == TAG_Zero)
+    {
+      if (tagb == TAG_Zero)
+        {
+          /* Both are zero, result will be zero. */
+          u_char different_signs = signa ^ signb;
+
+          FPU_copy_to_regi(a, TAG_Zero, deststnr);
+          if ( different_signs )
+            {
+              /* Signs are different. */
+              /* Sign of answer depends upon rounding mode. */
+              setsign(dest, ((control_w & CW_RC) != RC_DOWN)
+                      ? SIGN_POS : SIGN_NEG);
+            }
+          else
+            setsign(dest, signa);  /* signa may differ from the sign of a. */
+          return TAG_Zero;
+        }
+      else
+        {
+          reg_copy(b, dest);
+          if ( (tagb == TW_Denormal) && (b->sigh & 0x80000000) )
+            {
+              /* A pseudoDenormal, convert it. */
+              addexponent(dest, 1);
+              tagb = TAG_Valid;
+            }
+          else if ( tagb > TAG_Empty )
+            tagb = TAG_Special;
+          setsign(dest, signb);  /* signb may differ from the sign of b. */
+          FPU_settagi(deststnr, tagb);
+          return tagb;
+        }
+    }
+  else if (tagb == TAG_Zero)
+    {
+      reg_copy(a, dest);
+      if ( (taga == TW_Denormal) && (a->sigh & 0x80000000) )
+        {
+          /* A pseudoDenormal */
+          addexponent(dest, 1);
+          taga = TAG_Valid;
+        }
+      else if ( taga > TAG_Empty )
+        taga = TAG_Special;
+      setsign(dest, signa);  /* signa may differ from the sign of a. */
+      FPU_settagi(deststnr, taga);
+      return taga;
+    }
+  else if (taga == TW_Infinity)
+    {
+      if ( (tagb != TW_Infinity) || (signa == signb) )
+        {
+          FPU_copy_to_regi(a, TAG_Special, deststnr);
+          setsign(dest, signa);  /* signa may differ from the sign of a. */
+          return taga;
+        }
+      /* Infinity-Infinity is undefined. */
+      return arith_invalid(deststnr);
+    }
+  else if (tagb == TW_Infinity)
+    {
+      FPU_copy_to_regi(b, TAG_Special, deststnr);
+      setsign(dest, signb);  /* signb may differ from the sign of b. */
+      return tagb;
+    }
+
+#ifdef PARANOID
+  EXCEPTION(EX_INTERNAL|0x101);
+#endif
+
+  return FPU_Exception;
+}
+
diff --git a/arch/i386/math-emu/reg_compare.c b/arch/i386/math-emu/reg_compare.c
new file mode 100644
index 000000000000..f37c5b5a35ad
--- /dev/null
+++ b/arch/i386/math-emu/reg_compare.c
@@ -0,0 +1,381 @@
+/*---------------------------------------------------------------------------+
+ |  reg_compare.c                                                            |
+ |                                                                           |
+ | Compare two floating point registers                                      |
+ |                                                                           |
+ | Copyright (C) 1992,1993,1994,1997                                         |
+ |                  W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia |
+ |                  E-mail   billm@suburbia.net                              |
+ |                                                                           |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------+
+ | compare() is the core FPU_REG comparison function                         |
+ +---------------------------------------------------------------------------*/
+
+#include "fpu_system.h"
+#include "exception.h"
+#include "fpu_emu.h"
+#include "control_w.h"
+#include "status_w.h"
+
+
+static int compare(FPU_REG const *b, int tagb)
+{
+  int diff, exp0, expb;
+  u_char                st0_tag;
+  FPU_REG       *st0_ptr;
+  FPU_REG       x, y;
+  u_char                st0_sign, signb = getsign(b);
+
+  st0_ptr = &st(0);
+  st0_tag = FPU_gettag0();
+  st0_sign = getsign(st0_ptr);
+
+  if ( tagb == TAG_Special )
+    tagb = FPU_Special(b);
+  if ( st0_tag == TAG_Special )
+    st0_tag = FPU_Special(st0_ptr);
+
+  if ( ((st0_tag != TAG_Valid) && (st0_tag != TW_Denormal))
+       || ((tagb != TAG_Valid) && (tagb != TW_Denormal)) )
+    {
+      if ( st0_tag == TAG_Zero )
+        {
+          if ( tagb == TAG_Zero ) return COMP_A_eq_B;
+          if ( tagb == TAG_Valid )
+            return ((signb == SIGN_POS) ? COMP_A_lt_B : COMP_A_gt_B);
+          if ( tagb == TW_Denormal )
+            return ((signb == SIGN_POS) ? COMP_A_lt_B : COMP_A_gt_B)
+            | COMP_Denormal;
+        }
+      else if ( tagb == TAG_Zero )
+        {
+          if ( st0_tag == TAG_Valid )
+            return ((st0_sign == SIGN_POS) ? COMP_A_gt_B : COMP_A_lt_B);
+          if ( st0_tag == TW_Denormal )
+            return ((st0_sign == SIGN_POS) ? COMP_A_gt_B : COMP_A_lt_B)
+            | COMP_Denormal;
+        }
+
+      if ( st0_tag == TW_Infinity )
+        {
+          if ( (tagb == TAG_Valid) || (tagb == TAG_Zero) )
+            return ((st0_sign == SIGN_POS) ? COMP_A_gt_B : COMP_A_lt_B);
+          else if ( tagb == TW_Denormal )
+            return ((st0_sign == SIGN_POS) ? COMP_A_gt_B : COMP_A_lt_B)
+              | COMP_Denormal;
+          else if ( tagb == TW_Infinity )
+            {
+              /* The 80486 book says that infinities can be equal! */
+              return (st0_sign == signb) ? COMP_A_eq_B :
+                ((st0_sign == SIGN_POS) ? COMP_A_gt_B : COMP_A_lt_B);
+            }
+          /* Fall through to the NaN code */
+        }
+      else if ( tagb == TW_Infinity )
+        {
+          if ( (st0_tag == TAG_Valid) || (st0_tag == TAG_Zero) )
+            return ((signb == SIGN_POS) ? COMP_A_lt_B : COMP_A_gt_B);
+          if ( st0_tag == TW_Denormal )
+            return ((signb == SIGN_POS) ? COMP_A_lt_B : COMP_A_gt_B)
+                | COMP_Denormal;
+          /* Fall through to the NaN code */
+        }
+
+      /* The only possibility now should be that one of the arguments
+         is a NaN */
+      if ( (st0_tag == TW_NaN) || (tagb == TW_NaN) )
+        {
+          int signalling = 0, unsupported = 0;
+          if ( st0_tag == TW_NaN )
+            {
+              signalling = (st0_ptr->sigh & 0xc0000000) == 0x80000000;
+              unsupported = !((exponent(st0_ptr) == EXP_OVER)
+                              && (st0_ptr->sigh & 0x80000000));
+            }
+          if ( tagb == TW_NaN )
+            {
+              signalling |= (b->sigh & 0xc0000000) == 0x80000000;
+              unsupported |= !((exponent(b) == EXP_OVER)
+                               && (b->sigh & 0x80000000));
+            }
+          if ( signalling || unsupported )
+            return COMP_No_Comp | COMP_SNaN | COMP_NaN;
+          else
+            /* Neither is a signaling NaN */
+            return COMP_No_Comp | COMP_NaN;
+        }
+      
+      EXCEPTION(EX_Invalid);
+    }
+  
+  if (st0_sign != signb)
+    {
+      return ((st0_sign == SIGN_POS) ? COMP_A_gt_B : COMP_A_lt_B)
+        | ( ((st0_tag == TW_Denormal) || (tagb == TW_Denormal)) ?
+            COMP_Denormal : 0);
+    }
+
+  if ( (st0_tag == TW_Denormal) || (tagb == TW_Denormal) )
+    {
+      FPU_to_exp16(st0_ptr, &x);
+      FPU_to_exp16(b, &y);
+      st0_ptr = &x;
+      b = &y;
+      exp0 = exponent16(st0_ptr);
+      expb = exponent16(b);
+    }
+  else
+    {
+      exp0 = exponent(st0_ptr);
+      expb = exponent(b);
+    }
+
+#ifdef PARANOID
+  if (!(st0_ptr->sigh & 0x80000000)) EXCEPTION(EX_Invalid);
+  if (!(b->sigh & 0x80000000)) EXCEPTION(EX_Invalid);
+#endif /* PARANOID */
+
+  diff = exp0 - expb;
+  if ( diff == 0 )
+    {
+      diff = st0_ptr->sigh - b->sigh;  /* Works only if ms bits are
+                                              identical */
+      if ( diff == 0 )
+        {
+        diff = st0_ptr->sigl > b->sigl;
+        if ( diff == 0 )
+          diff = -(st0_ptr->sigl < b->sigl);
+        }
+    }
+
+  if ( diff > 0 )
+    {
+      return ((st0_sign == SIGN_POS) ? COMP_A_gt_B : COMP_A_lt_B)
+        | ( ((st0_tag == TW_Denormal) || (tagb == TW_Denormal)) ?
+            COMP_Denormal : 0);
+    }
+  if ( diff < 0 )
+    {
+      return ((st0_sign == SIGN_POS) ? COMP_A_lt_B : COMP_A_gt_B)
+        | ( ((st0_tag == TW_Denormal) || (tagb == TW_Denormal)) ?
+            COMP_Denormal : 0);
+    }
+
+  return COMP_A_eq_B
+    | ( ((st0_tag == TW_Denormal) || (tagb == TW_Denormal)) ?
+        COMP_Denormal : 0);
+
+}
+
+
+/* This function requires that st(0) is not empty */
+int FPU_compare_st_data(FPU_REG const *loaded_data, u_char loaded_tag)
+{
+  int f = 0, c;
+
+  c = compare(loaded_data, loaded_tag);
+
+  if (c & COMP_NaN)
+    {
+      EXCEPTION(EX_Invalid);
+      f = SW_C3 | SW_C2 | SW_C0;
+    }
+  else
+    switch (c & 7)
+      {
+      case COMP_A_lt_B:
+        f = SW_C0;
+        break;
+      case COMP_A_eq_B:
+        f = SW_C3;
+        break;
+      case COMP_A_gt_B:
+        f = 0;
+        break;
+      case COMP_No_Comp:
+        f = SW_C3 | SW_C2 | SW_C0;
+        break;
+#ifdef PARANOID
+      default:
+        EXCEPTION(EX_INTERNAL|0x121);
+        f = SW_C3 | SW_C2 | SW_C0;
+        break;
+#endif /* PARANOID */
+      }
+  setcc(f);
+  if (c & COMP_Denormal)
+    {
+      return denormal_operand() < 0;
+    }
+  return 0;
+}
+
+
+static int compare_st_st(int nr)
+{
+  int f = 0, c;
+  FPU_REG *st_ptr;
+
+  if ( !NOT_EMPTY(0) || !NOT_EMPTY(nr) )
+    {
+      setcc(SW_C3 | SW_C2 | SW_C0);
+      /* Stack fault */
+      EXCEPTION(EX_StackUnder);
+      return !(control_word & CW_Invalid);
+    }
+
+  st_ptr = &st(nr);
+  c = compare(st_ptr, FPU_gettagi(nr));
+  if (c & COMP_NaN)
+    {
+      setcc(SW_C3 | SW_C2 | SW_C0);
+      EXCEPTION(EX_Invalid);
+      return !(control_word & CW_Invalid);
+    }
+  else
+    switch (c & 7)
+      {
+      case COMP_A_lt_B:
+        f = SW_C0;
+        break;
+      case COMP_A_eq_B:
+        f = SW_C3;
+        break;
+      case COMP_A_gt_B:
+        f = 0;
+        break;
+      case COMP_No_Comp:
+        f = SW_C3 | SW_C2 | SW_C0;
+        break;
+#ifdef PARANOID
+      default:
+        EXCEPTION(EX_INTERNAL|0x122);
+        f = SW_C3 | SW_C2 | SW_C0;
+        break;
+#endif /* PARANOID */
+      }
+  setcc(f);
+  if (c & COMP_Denormal)
+    {
+      return denormal_operand() < 0;
+    }
+  return 0;
+}
+
+
+static int compare_u_st_st(int nr)
+{
+  int f = 0, c;
+  FPU_REG *st_ptr;
+
+  if ( !NOT_EMPTY(0) || !NOT_EMPTY(nr) )
+    {
+      setcc(SW_C3 | SW_C2 | SW_C0);
+      /* Stack fault */
+      EXCEPTION(EX_StackUnder);
+      return !(control_word & CW_Invalid);
+    }
+
+  st_ptr = &st(nr);
+  c = compare(st_ptr, FPU_gettagi(nr));
+  if (c & COMP_NaN)
+    {
+      setcc(SW_C3 | SW_C2 | SW_C0);
+      if (c & COMP_SNaN)       /* This is the only difference between
+                                  un-ordered and ordinary comparisons */
+        {
+          EXCEPTION(EX_Invalid);
+          return !(control_word & CW_Invalid);
+        }
+      return 0;
+    }
+  else
+    switch (c & 7)
+      {
+      case COMP_A_lt_B:
+        f = SW_C0;
+        break;
+      case COMP_A_eq_B:
+        f = SW_C3;
+        break;
+      case COMP_A_gt_B:
+        f = 0;
+        break;
+      case COMP_No_Comp:
+        f = SW_C3 | SW_C2 | SW_C0;
+        break;
+#ifdef PARANOID
+      default:
+        EXCEPTION(EX_INTERNAL|0x123);
+        f = SW_C3 | SW_C2 | SW_C0;
+        break;
+#endif /* PARANOID */ 
+      }
+  setcc(f);
+  if (c & COMP_Denormal)
+    {
+      return denormal_operand() < 0;
+    }
+  return 0;
+}
+
+/*---------------------------------------------------------------------------*/
+
+void fcom_st(void)
+{
+  /* fcom st(i) */
+  compare_st_st(FPU_rm);
+}
+
+
+void fcompst(void)
+{
+  /* fcomp st(i) */
+  if ( !compare_st_st(FPU_rm) )
+    FPU_pop();
+}
+
+
+void fcompp(void)
+{
+  /* fcompp */
+  if (FPU_rm != 1)
+    {
+      FPU_illegal();
+      return;
+    }
+  if ( !compare_st_st(1) )
+      poppop();
+}
+
+
+void fucom_(void)
+{
+  /* fucom st(i) */
+  compare_u_st_st(FPU_rm);
+
+}
+
+
+void fucomp(void)
+{
+  /* fucomp st(i) */
+  if ( !compare_u_st_st(FPU_rm) )
+    FPU_pop();
+}
+
+
+void fucompp(void)
+{
+  /* fucompp */
+  if (FPU_rm == 1)
+    {
+      if ( !compare_u_st_st(1) )
+        poppop();
+    }
+  else
+    FPU_illegal();
+}
diff --git a/arch/i386/math-emu/reg_constant.c b/arch/i386/math-emu/reg_constant.c
new file mode 100644
index 000000000000..a85015801969
--- /dev/null
+++ b/arch/i386/math-emu/reg_constant.c
@@ -0,0 +1,120 @@
+/*---------------------------------------------------------------------------+
+ |  reg_constant.c                                                           |
+ |                                                                           |
+ | All of the constant FPU_REGs                                              |
+ |                                                                           |
+ | Copyright (C) 1992,1993,1994,1997                                         |
+ |                     W. Metzenthen, 22 Parker St, Ormond, Vic 3163,        |
+ |                     Australia.  E-mail   billm@suburbia.net               |
+ |                                                                           |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+#include "fpu_system.h"
+#include "fpu_emu.h"
+#include "status_w.h"
+#include "reg_constant.h"
+#include "control_w.h"
+
+
+#define MAKE_REG(s,e,l,h) { l, h, \
+                            ((EXTENDED_Ebias+(e)) | ((SIGN_##s != 0)*0x8000)) }
+
+FPU_REG const CONST_1    = MAKE_REG(POS, 0, 0x00000000, 0x80000000);
+#if 0
+FPU_REG const CONST_2    = MAKE_REG(POS, 1, 0x00000000, 0x80000000);
+FPU_REG const CONST_HALF = MAKE_REG(POS, -1, 0x00000000, 0x80000000);
+#endif  /*  0  */
+static FPU_REG const CONST_L2T  = MAKE_REG(POS, 1, 0xcd1b8afe, 0xd49a784b);
+static FPU_REG const CONST_L2E  = MAKE_REG(POS, 0, 0x5c17f0bc, 0xb8aa3b29);
+FPU_REG const CONST_PI   = MAKE_REG(POS, 1, 0x2168c235, 0xc90fdaa2);
+FPU_REG const CONST_PI2  = MAKE_REG(POS, 0, 0x2168c235, 0xc90fdaa2);
+FPU_REG const CONST_PI4  = MAKE_REG(POS, -1, 0x2168c235, 0xc90fdaa2);
+static FPU_REG const CONST_LG2  = MAKE_REG(POS, -2, 0xfbcff799, 0x9a209a84);
+static FPU_REG const CONST_LN2  = MAKE_REG(POS, -1, 0xd1cf79ac, 0xb17217f7);
+
+/* Extra bits to take pi/2 to more than 128 bits precision. */
+FPU_REG const CONST_PI2extra = MAKE_REG(NEG, -66,
+                                         0xfc8f8cbb, 0xece675d1);
+
+/* Only the sign (and tag) is used in internal zeroes */
+FPU_REG const CONST_Z    = MAKE_REG(POS, EXP_UNDER, 0x0, 0x0);
+
+/* Only the sign and significand (and tag) are used in internal NaNs */
+/* The 80486 never generates one of these 
+FPU_REG const CONST_SNAN = MAKE_REG(POS, EXP_OVER, 0x00000001, 0x80000000);
+ */
+/* This is the real indefinite QNaN */
+FPU_REG const CONST_QNaN = MAKE_REG(NEG, EXP_OVER, 0x00000000, 0xC0000000);
+
+/* Only the sign (and tag) is used in internal infinities */
+FPU_REG const CONST_INF  = MAKE_REG(POS, EXP_OVER, 0x00000000, 0x80000000);
+
+
+static void fld_const(FPU_REG const *c, int adj, u_char tag)
+{
+  FPU_REG *st_new_ptr;
+
+  if ( STACK_OVERFLOW )
+    {
+      FPU_stack_overflow();
+      return;
+    }
+  push();
+  reg_copy(c, st_new_ptr);
+  st_new_ptr->sigl += adj;  /* For all our fldxxx constants, we don't need to
+                               borrow or carry. */
+  FPU_settag0(tag);
+  clear_C1();
+}
+
+/* A fast way to find out whether x is one of RC_DOWN or RC_CHOP
+   (and not one of RC_RND or RC_UP).
+   */
+#define DOWN_OR_CHOP(x)  (x & RC_DOWN)
+
+static void fld1(int rc)
+{
+  fld_const(&CONST_1, 0, TAG_Valid);
+}
+
+static void fldl2t(int rc)
+{
+  fld_const(&CONST_L2T, (rc == RC_UP) ? 1 : 0, TAG_Valid);
+}
+
+static void fldl2e(int rc)
+{
+  fld_const(&CONST_L2E, DOWN_OR_CHOP(rc) ? -1 : 0, TAG_Valid);
+}
+
+static void fldpi(int rc)
+{
+  fld_const(&CONST_PI, DOWN_OR_CHOP(rc) ? -1 : 0, TAG_Valid);
+}
+
+static void fldlg2(int rc)
+{
+  fld_const(&CONST_LG2, DOWN_OR_CHOP(rc) ? -1 : 0, TAG_Valid);
+}
+
+static void fldln2(int rc)
+{
+  fld_const(&CONST_LN2, DOWN_OR_CHOP(rc) ? -1 : 0, TAG_Valid);
+}
+
+static void fldz(int rc)
+{
+  fld_const(&CONST_Z, 0, TAG_Zero);
+}
+
+typedef void (*FUNC_RC)(int);
+
+static FUNC_RC constants_table[] = {
+  fld1, fldl2t, fldl2e, fldpi, fldlg2, fldln2, fldz, (FUNC_RC)FPU_illegal
+};
+
+void fconst(void)
+{
+  (constants_table[FPU_rm])(control_word & CW_RC);
+}
diff --git a/arch/i386/math-emu/reg_constant.h b/arch/i386/math-emu/reg_constant.h
new file mode 100644
index 000000000000..1bffaec3a134
--- /dev/null
+++ b/arch/i386/math-emu/reg_constant.h
@@ -0,0 +1,25 @@
+/*---------------------------------------------------------------------------+
+ |  reg_constant.h                                                           |
+ |                                                                           |
+ | Copyright (C) 1992    W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
+ |                       Australia.  E-mail   billm@vaxc.cc.monash.edu.au    |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+#ifndef _REG_CONSTANT_H_
+#define _REG_CONSTANT_H_
+
+#include "fpu_emu.h"
+
+extern FPU_REG const CONST_1;
+extern FPU_REG const CONST_PI;
+extern FPU_REG const CONST_PI2;
+extern FPU_REG const CONST_PI2extra;
+extern FPU_REG const CONST_PI4;
+extern FPU_REG const CONST_Z;
+extern FPU_REG const CONST_PINF;
+extern FPU_REG const CONST_INF;
+extern FPU_REG const CONST_MINF;
+extern FPU_REG const CONST_QNaN;
+
+#endif /* _REG_CONSTANT_H_ */
diff --git a/arch/i386/math-emu/reg_convert.c b/arch/i386/math-emu/reg_convert.c
new file mode 100644
index 000000000000..45a258752703
--- /dev/null
+++ b/arch/i386/math-emu/reg_convert.c
@@ -0,0 +1,53 @@
+/*---------------------------------------------------------------------------+
+ |  reg_convert.c                                                            |
+ |                                                                           |
+ |  Convert register representation.                                         |
+ |                                                                           |
+ | Copyright (C) 1992,1993,1994,1996,1997                                    |
+ |                  W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia |
+ |                  E-mail   billm@suburbia.net                              |
+ |                                                                           |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+#include "exception.h"
+#include "fpu_emu.h"
+
+
+int FPU_to_exp16(FPU_REG const *a, FPU_REG *x)
+{
+  int sign = getsign(a);
+
+  *(long long *)&(x->sigl) = *(const long long *)&(a->sigl);
+
+  /* Set up the exponent as a 16 bit quantity. */
+  setexponent16(x, exponent(a));
+
+  if ( exponent16(x) == EXP_UNDER )
+    {
+      /* The number is a de-normal or pseudodenormal. */
+      /* We only deal with the significand and exponent. */
+
+      if (x->sigh & 0x80000000)
+        {
+          /* Is a pseudodenormal. */
+          /* This is non-80486 behaviour because the number
+             loses its 'denormal' identity. */
+          addexponent(x, 1);
+        }
+      else
+        {
+          /* Is a denormal. */
+          addexponent(x, 1);
+          FPU_normalize_nuo(x);
+        }
+    }
+
+  if ( !(x->sigh & 0x80000000) )
+    {
+      EXCEPTION(EX_INTERNAL | 0x180);
+    }
+
+  return sign;
+}
+
diff --git a/arch/i386/math-emu/reg_divide.c b/arch/i386/math-emu/reg_divide.c
new file mode 100644
index 000000000000..5cee7ff920d9
--- /dev/null
+++ b/arch/i386/math-emu/reg_divide.c
@@ -0,0 +1,207 @@
+/*---------------------------------------------------------------------------+
+ |  reg_divide.c                                                             |
+ |                                                                           |
+ | Divide one FPU_REG by another and put the result in a destination FPU_REG.|
+ |                                                                           |
+ | Copyright (C) 1996                                                        |
+ |                  W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia |
+ |                  E-mail   billm@jacobi.maths.monash.edu.au                |
+ |                                                                           |
+ |    Return value is the tag of the answer, or-ed with FPU_Exception if     |
+ |    one was raised, or -1 on internal error.                               |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------+
+ | The destination may be any FPU_REG, including one of the source FPU_REGs. |
+ +---------------------------------------------------------------------------*/
+
+#include "exception.h"
+#include "reg_constant.h"
+#include "fpu_emu.h"
+#include "fpu_system.h"
+
+/*
+  Divide one register by another and put the result into a third register.
+  */
+int FPU_div(int flags, int rm, int control_w)
+{
+  FPU_REG x, y;
+  FPU_REG const *a, *b, *st0_ptr, *st_ptr;
+  FPU_REG *dest;
+  u_char taga, tagb, signa, signb, sign, saved_sign;
+  int tag, deststnr;
+
+  if ( flags & DEST_RM )
+    deststnr = rm;
+  else
+    deststnr = 0;
+
+  if ( flags & REV )
+    {
+      b = &st(0);
+      st0_ptr = b;
+      tagb = FPU_gettag0();
+      if ( flags & LOADED )
+        {
+          a = (FPU_REG *)rm;
+          taga = flags & 0x0f;
+        }
+      else
+        {
+          a = &st(rm);
+          st_ptr = a;
+          taga = FPU_gettagi(rm);
+        }
+    }
+  else
+    {
+      a = &st(0);
+      st0_ptr = a;
+      taga = FPU_gettag0();
+      if ( flags & LOADED )
+        {
+          b = (FPU_REG *)rm;
+          tagb = flags & 0x0f;
+        }
+      else
+        {
+          b = &st(rm);
+          st_ptr = b;
+          tagb = FPU_gettagi(rm);
+        }
+    }
+
+  signa = getsign(a);
+  signb = getsign(b);
+
+  sign = signa ^ signb;
+
+  dest = &st(deststnr);
+  saved_sign = getsign(dest);
+
+  if ( !(taga | tagb) )
+    {
+      /* Both regs Valid, this should be the most common case. */
+      reg_copy(a, &x);
+      reg_copy(b, &y);
+      setpositive(&x);
+      setpositive(&y);
+      tag = FPU_u_div(&x, &y, dest, control_w, sign);
+
+      if ( tag < 0 )
+        return tag;
+
+      FPU_settagi(deststnr, tag);
+      return tag;
+    }
+
+  if ( taga == TAG_Special )
+    taga = FPU_Special(a);
+  if ( tagb == TAG_Special )
+    tagb = FPU_Special(b);
+
+  if ( ((taga == TAG_Valid) && (tagb == TW_Denormal))
+            || ((taga == TW_Denormal) && (tagb == TAG_Valid))
+            || ((taga == TW_Denormal) && (tagb == TW_Denormal)) )
+    {
+      if ( denormal_operand() < 0 )
+        return FPU_Exception;
+
+      FPU_to_exp16(a, &x);
+      FPU_to_exp16(b, &y);
+      tag = FPU_u_div(&x, &y, dest, control_w, sign);
+      if ( tag < 0 )
+        return tag;
+
+      FPU_settagi(deststnr, tag);
+      return tag;
+    }
+  else if ( (taga <= TW_Denormal) && (tagb <= TW_Denormal) )
+    {
+      if ( tagb != TAG_Zero )
+        {
+          /* Want to find Zero/Valid */
+          if ( tagb == TW_Denormal )
+            {
+              if ( denormal_operand() < 0 )
+                return FPU_Exception;
+            }
+
+          /* The result is zero. */
+          FPU_copy_to_regi(&CONST_Z, TAG_Zero, deststnr);
+          setsign(dest, sign);
+          return TAG_Zero;
+        }
+      /* We have an exception condition, either 0/0 or Valid/Zero. */
+      if ( taga == TAG_Zero )
+        {
+          /* 0/0 */
+          return arith_invalid(deststnr);
+        }
+      /* Valid/Zero */
+      return FPU_divide_by_zero(deststnr, sign);
+    }
+  /* Must have infinities, NaNs, etc */
+  else if ( (taga == TW_NaN) || (tagb == TW_NaN) )
+    {
+      if ( flags & LOADED )
+        return real_2op_NaN((FPU_REG *)rm, flags & 0x0f, 0, st0_ptr);
+
+      if ( flags & DEST_RM )
+        {
+          int tag;
+          tag = FPU_gettag0();
+          if ( tag == TAG_Special )
+            tag = FPU_Special(st0_ptr);
+          return real_2op_NaN(st0_ptr, tag, rm, (flags & REV) ? st0_ptr : &st(rm));
+        }
+      else
+        {
+          int tag;
+          tag = FPU_gettagi(rm);
+          if ( tag == TAG_Special )
+            tag = FPU_Special(&st(rm));
+          return real_2op_NaN(&st(rm), tag, 0, (flags & REV) ? st0_ptr : &st(rm));
+        }
+    }
+  else if (taga == TW_Infinity)
+    {
+      if (tagb == TW_Infinity)
+        {
+          /* infinity/infinity */
+          return arith_invalid(deststnr);
+        }
+      else
+        {
+          /* tagb must be Valid or Zero */
+          if ( (tagb == TW_Denormal) && (denormal_operand() < 0) )
+            return FPU_Exception;
+          
+          /* Infinity divided by Zero or Valid does
+             not raise and exception, but returns Infinity */
+          FPU_copy_to_regi(a, TAG_Special, deststnr);
+          setsign(dest, sign);
+          return taga;
+        }
+    }
+  else if (tagb == TW_Infinity)
+    {
+      if ( (taga == TW_Denormal) && (denormal_operand() < 0) )
+        return FPU_Exception;
+
+      /* The result is zero. */
+      FPU_copy_to_regi(&CONST_Z, TAG_Zero, deststnr);
+      setsign(dest, sign);
+      return TAG_Zero;
+    }
+#ifdef PARANOID
+  else
+    {
+      EXCEPTION(EX_INTERNAL|0x102);
+      return FPU_Exception;
+    }
+#endif /* PARANOID */ 
+
+        return 0;
+}
diff --git a/arch/i386/math-emu/reg_ld_str.c b/arch/i386/math-emu/reg_ld_str.c
new file mode 100644
index 000000000000..f06ed41d191d
--- /dev/null
+++ b/arch/i386/math-emu/reg_ld_str.c
@@ -0,0 +1,1370 @@
+/*---------------------------------------------------------------------------+
+ |  reg_ld_str.c                                                             |
+ |                                                                           |
+ | All of the functions which transfer data between user memory and FPU_REGs.|
+ |                                                                           |
+ | Copyright (C) 1992,1993,1994,1996,1997                                    |
+ |                  W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia |
+ |                  E-mail   billm@suburbia.net                              |
+ |                                                                           |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------+
+ | Note:                                                                     |
+ |    The file contains code which accesses user memory.                     |
+ |    Emulator static data may change when user memory is accessed, due to   |
+ |    other processes using the emulator while swapping is in progress.      |
+ +---------------------------------------------------------------------------*/
+
+#include "fpu_emu.h"
+
+#include <asm/uaccess.h>
+
+#include "fpu_system.h"
+#include "exception.h"
+#include "reg_constant.h"
+#include "control_w.h"
+#include "status_w.h"
+
+
+#define DOUBLE_Emax 1023         /* largest valid exponent */
+#define DOUBLE_Ebias 1023
+#define DOUBLE_Emin (-1022)      /* smallest valid exponent */
+
+#define SINGLE_Emax 127          /* largest valid exponent */
+#define SINGLE_Ebias 127
+#define SINGLE_Emin (-126)       /* smallest valid exponent */
+
+
+static u_char normalize_no_excep(FPU_REG *r, int exp, int sign)
+{
+  u_char tag;
+
+  setexponent16(r, exp);
+
+  tag = FPU_normalize_nuo(r);
+  stdexp(r);
+  if ( sign )
+    setnegative(r);
+
+  return tag;
+}
+
+
+int FPU_tagof(FPU_REG *ptr)
+{
+  int exp;
+
+  exp = exponent16(ptr) & 0x7fff;
+  if ( exp == 0 )
+    {
+      if ( !(ptr->sigh | ptr->sigl) )
+        {
+          return TAG_Zero;
+        }
+      /* The number is a de-normal or pseudodenormal. */
+      return TAG_Special;
+    }
+
+  if ( exp == 0x7fff )
+    {
+      /* Is an Infinity, a NaN, or an unsupported data type. */
+      return TAG_Special;
+    }
+
+  if ( !(ptr->sigh & 0x80000000) )
+    {
+      /* Unsupported data type. */
+      /* Valid numbers have the ms bit set to 1. */
+      /* Unnormal. */
+      return TAG_Special;
+    }
+
+  return TAG_Valid;
+}
+
+
+/* Get a long double from user memory */
+int FPU_load_extended(long double __user *s, int stnr)
+{
+  FPU_REG *sti_ptr = &st(stnr);
+
+  RE_ENTRANT_CHECK_OFF;
+  FPU_access_ok(VERIFY_READ, s, 10);
+  __copy_from_user(sti_ptr, s, 10);
+  RE_ENTRANT_CHECK_ON;
+
+  return FPU_tagof(sti_ptr);
+}
+
+
+/* Get a double from user memory */
+int FPU_load_double(double __user *dfloat, FPU_REG *loaded_data)
+{
+  int exp, tag, negative;
+  unsigned m64, l64;
+
+  RE_ENTRANT_CHECK_OFF;
+  FPU_access_ok(VERIFY_READ, dfloat, 8);
+  FPU_get_user(m64, 1 + (unsigned long __user *) dfloat);
+  FPU_get_user(l64, (unsigned long __user *) dfloat);
+  RE_ENTRANT_CHECK_ON;
+
+  negative = (m64 & 0x80000000) ? SIGN_Negative : SIGN_Positive;
+  exp = ((m64 & 0x7ff00000) >> 20) - DOUBLE_Ebias + EXTENDED_Ebias;
+  m64 &= 0xfffff;
+  if ( exp > DOUBLE_Emax + EXTENDED_Ebias )
+    {
+      /* Infinity or NaN */
+      if ((m64 == 0) && (l64 == 0))
+        {
+          /* +- infinity */
+          loaded_data->sigh = 0x80000000;
+          loaded_data->sigl = 0x00000000;
+          exp = EXP_Infinity + EXTENDED_Ebias;
+          tag = TAG_Special;
+        }
+      else
+        {
+          /* Must be a signaling or quiet NaN */
+          exp = EXP_NaN + EXTENDED_Ebias;
+          loaded_data->sigh = (m64 << 11) | 0x80000000;
+          loaded_data->sigh |= l64 >> 21;
+          loaded_data->sigl = l64 << 11;
+          tag = TAG_Special;    /* The calling function must look for NaNs */
+        }
+    }
+  else if ( exp < DOUBLE_Emin + EXTENDED_Ebias )
+    {
+      /* Zero or de-normal */
+      if ((m64 == 0) && (l64 == 0))
+        {
+          /* Zero */
+          reg_copy(&CONST_Z, loaded_data);
+          exp = 0;
+          tag = TAG_Zero;
+        }
+      else
+        {
+          /* De-normal */
+          loaded_data->sigh = m64 << 11;
+          loaded_data->sigh |= l64 >> 21;
+          loaded_data->sigl = l64 << 11;
+
+          return normalize_no_excep(loaded_data, DOUBLE_Emin, negative)
+            | (denormal_operand() < 0 ? FPU_Exception : 0);
+        }
+    }
+  else
+    {
+      loaded_data->sigh = (m64 << 11) | 0x80000000;
+      loaded_data->sigh |= l64 >> 21;
+      loaded_data->sigl = l64 << 11;
+
+      tag = TAG_Valid;
+    }
+
+  setexponent16(loaded_data, exp | negative);
+
+  return tag;
+}
+
+
+/* Get a float from user memory */
+int FPU_load_single(float __user *single, FPU_REG *loaded_data)
+{
+  unsigned m32;
+  int exp, tag, negative;
+
+  RE_ENTRANT_CHECK_OFF;
+  FPU_access_ok(VERIFY_READ, single, 4);
+  FPU_get_user(m32, (unsigned long __user *) single);
+  RE_ENTRANT_CHECK_ON;
+
+  negative = (m32 & 0x80000000) ? SIGN_Negative : SIGN_Positive;
+
+  if (!(m32 & 0x7fffffff))
+    {
+      /* Zero */
+      reg_copy(&CONST_Z, loaded_data);
+      addexponent(loaded_data, negative);
+      return TAG_Zero;
+    }
+  exp = ((m32 & 0x7f800000) >> 23) - SINGLE_Ebias + EXTENDED_Ebias;
+  m32 = (m32 & 0x7fffff) << 8;
+  if ( exp < SINGLE_Emin + EXTENDED_Ebias )
+    {
+      /* De-normals */
+      loaded_data->sigh = m32;
+      loaded_data->sigl = 0;
+
+      return normalize_no_excep(loaded_data, SINGLE_Emin, negative)
+        | (denormal_operand() < 0 ? FPU_Exception : 0);
+    }
+  else if ( exp > SINGLE_Emax + EXTENDED_Ebias )
+    {
+    /* Infinity or NaN */
+      if ( m32 == 0 )
+        {
+          /* +- infinity */
+          loaded_data->sigh = 0x80000000;
+          loaded_data->sigl = 0x00000000;
+          exp = EXP_Infinity + EXTENDED_Ebias;
+          tag = TAG_Special;
+        }
+      else
+        {
+          /* Must be a signaling or quiet NaN */
+          exp = EXP_NaN + EXTENDED_Ebias;
+          loaded_data->sigh = m32 | 0x80000000;
+          loaded_data->sigl = 0;
+          tag = TAG_Special;  /* The calling function must look for NaNs */
+        }
+    }
+  else
+    {
+      loaded_data->sigh = m32 | 0x80000000;
+      loaded_data->sigl = 0;
+      tag = TAG_Valid;
+    }
+
+  setexponent16(loaded_data, exp | negative);  /* Set the sign. */
+
+  return tag;
+}
+
+
+/* Get a long long from user memory */
+int FPU_load_int64(long long __user *_s)
+{
+  long long s;
+  int sign;
+  FPU_REG *st0_ptr = &st(0);
+
+  RE_ENTRANT_CHECK_OFF;
+  FPU_access_ok(VERIFY_READ, _s, 8);
+  copy_from_user(&s,_s,8);
+  RE_ENTRANT_CHECK_ON;
+
+  if (s == 0)
+    {
+      reg_copy(&CONST_Z, st0_ptr);
+      return TAG_Zero;
+    }
+
+  if (s > 0)
+    sign = SIGN_Positive;
+  else
+  {
+    s = -s;
+    sign = SIGN_Negative;
+  }
+
+  significand(st0_ptr) = s;
+
+  return normalize_no_excep(st0_ptr, 63, sign);
+}
+
+
+/* Get a long from user memory */
+int FPU_load_int32(long __user *_s, FPU_REG *loaded_data)
+{
+  long s;
+  int negative;
+
+  RE_ENTRANT_CHECK_OFF;
+  FPU_access_ok(VERIFY_READ, _s, 4);
+  FPU_get_user(s, _s);
+  RE_ENTRANT_CHECK_ON;
+
+  if (s == 0)
+    { reg_copy(&CONST_Z, loaded_data); return TAG_Zero; }
+
+  if (s > 0)
+    negative = SIGN_Positive;
+  else
+    {
+      s = -s;
+      negative = SIGN_Negative;
+    }
+
+  loaded_data->sigh = s;
+  loaded_data->sigl = 0;
+
+  return normalize_no_excep(loaded_data, 31, negative);
+}
+
+
+/* Get a short from user memory */
+int FPU_load_int16(short __user *_s, FPU_REG *loaded_data)
+{
+  int s, negative;
+
+  RE_ENTRANT_CHECK_OFF;
+  FPU_access_ok(VERIFY_READ, _s, 2);
+  /* Cast as short to get the sign extended. */
+  FPU_get_user(s, _s);
+  RE_ENTRANT_CHECK_ON;
+
+  if (s == 0)
+    { reg_copy(&CONST_Z, loaded_data); return TAG_Zero; }
+
+  if (s > 0)
+    negative = SIGN_Positive;
+  else
+    {
+      s = -s;
+      negative = SIGN_Negative;
+    }
+
+  loaded_data->sigh = s << 16;
+  loaded_data->sigl = 0;
+
+  return normalize_no_excep(loaded_data, 15, negative);
+}
+
+
+/* Get a packed bcd array from user memory */
+int FPU_load_bcd(u_char __user *s)
+{
+  FPU_REG *st0_ptr = &st(0);
+  int pos;
+  u_char bcd;
+  long long l=0;
+  int sign;
+
+  RE_ENTRANT_CHECK_OFF;
+  FPU_access_ok(VERIFY_READ, s, 10);
+  RE_ENTRANT_CHECK_ON;
+  for ( pos = 8; pos >= 0; pos--)
+    {
+      l *= 10;
+      RE_ENTRANT_CHECK_OFF;
+      FPU_get_user(bcd, s+pos);
+      RE_ENTRANT_CHECK_ON;
+      l += bcd >> 4;
+      l *= 10;
+      l += bcd & 0x0f;
+    }
+ 
+  RE_ENTRANT_CHECK_OFF;
+  FPU_get_user(sign, s+9);
+  sign = sign & 0x80 ? SIGN_Negative : SIGN_Positive;
+  RE_ENTRANT_CHECK_ON;
+
+  if ( l == 0 )
+    {
+      reg_copy(&CONST_Z, st0_ptr);
+      addexponent(st0_ptr, sign);   /* Set the sign. */
+      return TAG_Zero;
+    }
+  else
+    {
+      significand(st0_ptr) = l;
+      return normalize_no_excep(st0_ptr, 63, sign);
+    }
+}
+
+/*===========================================================================*/
+
+/* Put a long double into user memory */
+int FPU_store_extended(FPU_REG *st0_ptr, u_char st0_tag, long double __user *d)
+{
+  /*
+    The only exception raised by an attempt to store to an
+    extended format is the Invalid Stack exception, i.e.
+    attempting to store from an empty register.
+   */
+
+  if ( st0_tag != TAG_Empty )
+    {
+      RE_ENTRANT_CHECK_OFF;
+      FPU_access_ok(VERIFY_WRITE, d, 10);
+
+      FPU_put_user(st0_ptr->sigl, (unsigned long __user *) d);
+      FPU_put_user(st0_ptr->sigh, (unsigned long __user *) ((u_char __user *)d + 4));
+      FPU_put_user(exponent16(st0_ptr), (unsigned short __user *) ((u_char __user *)d + 8));
+      RE_ENTRANT_CHECK_ON;
+
+      return 1;
+    }
+
+  /* Empty register (stack underflow) */
+  EXCEPTION(EX_StackUnder);
+  if ( control_word & CW_Invalid )
+    {
+      /* The masked response */
+      /* Put out the QNaN indefinite */
+      RE_ENTRANT_CHECK_OFF;
+      FPU_access_ok(VERIFY_WRITE,d,10);
+      FPU_put_user(0, (unsigned long __user *) d);
+      FPU_put_user(0xc0000000, 1 + (unsigned long __user *) d);
+      FPU_put_user(0xffff, 4 + (short __user *) d);
+      RE_ENTRANT_CHECK_ON;
+      return 1;
+    }
+  else
+    return 0;
+
+}
+
+
+/* Put a double into user memory */
+int FPU_store_double(FPU_REG *st0_ptr, u_char st0_tag, double __user *dfloat)
+{
+  unsigned long l[2];
+  unsigned long increment = 0;  /* avoid gcc warnings */
+  int precision_loss;
+  int exp;
+  FPU_REG tmp;
+
+  if ( st0_tag == TAG_Valid )
+    {
+      reg_copy(st0_ptr, &tmp);
+      exp = exponent(&tmp);
+
+      if ( exp < DOUBLE_Emin )     /* It may be a denormal */
+        {
+          addexponent(&tmp, -DOUBLE_Emin + 52);  /* largest exp to be 51 */
+
+        denormal_arg:
+
+          if ( (precision_loss = FPU_round_to_int(&tmp, st0_tag)) )
+            {
+#ifdef PECULIAR_486
+              /* Did it round to a non-denormal ? */
+              /* This behaviour might be regarded as peculiar, it appears
+                 that the 80486 rounds to the dest precision, then
+                 converts to decide underflow. */
+              if ( !((tmp.sigh == 0x00100000) && (tmp.sigl == 0) &&
+                  (st0_ptr->sigl & 0x000007ff)) )
+#endif /* PECULIAR_486 */
+                {
+                  EXCEPTION(EX_Underflow);
+                  /* This is a special case: see sec 16.2.5.1 of
+                     the 80486 book */
+                  if ( !(control_word & CW_Underflow) )
+                    return 0;
+                }
+              EXCEPTION(precision_loss);
+              if ( !(control_word & CW_Precision) )
+                return 0;
+            }
+          l[0] = tmp.sigl;
+          l[1] = tmp.sigh;
+        }
+      else
+        {
+          if ( tmp.sigl & 0x000007ff )
+            {
+              precision_loss = 1;
+              switch (control_word & CW_RC)
+                {
+                case RC_RND:
+                  /* Rounding can get a little messy.. */
+                  increment = ((tmp.sigl & 0x7ff) > 0x400) |  /* nearest */
+                    ((tmp.sigl & 0xc00) == 0xc00);            /* odd -> even */
+                  break;
+                case RC_DOWN:   /* towards -infinity */
+                  increment = signpositive(&tmp) ? 0 : tmp.sigl & 0x7ff;
+                  break;
+                case RC_UP:     /* towards +infinity */
+                  increment = signpositive(&tmp) ? tmp.sigl & 0x7ff : 0;
+                  break;
+                case RC_CHOP:
+                  increment = 0;
+                  break;
+                }
+          
+              /* Truncate the mantissa */
+              tmp.sigl &= 0xfffff800;
+          
+              if ( increment )
+                {
+                  if ( tmp.sigl >= 0xfffff800 )
+                    {
+                      /* the sigl part overflows */
+                      if ( tmp.sigh == 0xffffffff )
+                        {
+                          /* The sigh part overflows */
+                          tmp.sigh = 0x80000000;
+                          exp++;
+                          if (exp >= EXP_OVER)
+                            goto overflow;
+                        }
+                      else
+                        {
+                          tmp.sigh ++;
+                        }
+                      tmp.sigl = 0x00000000;
+                    }
+                  else
+                    {
+                      /* We only need to increment sigl */
+                      tmp.sigl += 0x00000800;
+                    }
+                }
+            }
+          else
+            precision_loss = 0;
+          
+          l[0] = (tmp.sigl >> 11) | (tmp.sigh << 21);
+          l[1] = ((tmp.sigh >> 11) & 0xfffff);
+
+          if ( exp > DOUBLE_Emax )
+            {
+            overflow:
+              EXCEPTION(EX_Overflow);
+              if ( !(control_word & CW_Overflow) )
+                return 0;
+              set_precision_flag_up();
+              if ( !(control_word & CW_Precision) )
+                return 0;
+
+              /* This is a special case: see sec 16.2.5.1 of the 80486 book */
+              /* Overflow to infinity */
+              l[0] = 0x00000000;        /* Set to */
+              l[1] = 0x7ff00000;        /* + INF */
+            }
+          else
+            {
+              if ( precision_loss )
+                {
+                  if ( increment )
+                    set_precision_flag_up();
+                  else
+                    set_precision_flag_down();
+                }
+              /* Add the exponent */
+              l[1] |= (((exp+DOUBLE_Ebias) & 0x7ff) << 20);
+            }
+        }
+    }
+  else if (st0_tag == TAG_Zero)
+    {
+      /* Number is zero */
+      l[0] = 0;
+      l[1] = 0;
+    }
+  else if ( st0_tag == TAG_Special )
+    {
+      st0_tag = FPU_Special(st0_ptr);
+      if ( st0_tag == TW_Denormal )
+        {
+          /* A denormal will always underflow. */
+#ifndef PECULIAR_486
+          /* An 80486 is supposed to be able to generate
+             a denormal exception here, but... */
+          /* Underflow has priority. */
+          if ( control_word & CW_Underflow )
+            denormal_operand();
+#endif /* PECULIAR_486 */
+          reg_copy(st0_ptr, &tmp);
+          goto denormal_arg;
+        }
+      else if (st0_tag == TW_Infinity)
+        {
+          l[0] = 0;
+          l[1] = 0x7ff00000;
+        }
+      else if (st0_tag == TW_NaN)
+        {
+          /* Is it really a NaN ? */
+          if ( (exponent(st0_ptr) == EXP_OVER)
+               && (st0_ptr->sigh & 0x80000000) )
+            {
+              /* See if we can get a valid NaN from the FPU_REG */
+              l[0] = (st0_ptr->sigl >> 11) | (st0_ptr->sigh << 21);
+              l[1] = ((st0_ptr->sigh >> 11) & 0xfffff);
+              if ( !(st0_ptr->sigh & 0x40000000) )
+                {
+                  /* It is a signalling NaN */
+                  EXCEPTION(EX_Invalid);
+                  if ( !(control_word & CW_Invalid) )
+                    return 0;
+                  l[1] |= (0x40000000 >> 11);
+                }
+              l[1] |= 0x7ff00000;
+            }
+          else
+            {
+              /* It is an unsupported data type */
+              EXCEPTION(EX_Invalid);
+              if ( !(control_word & CW_Invalid) )
+                return 0;
+              l[0] = 0;
+              l[1] = 0xfff80000;
+            }
+        }
+    }
+  else if ( st0_tag == TAG_Empty )
+    {
+      /* Empty register (stack underflow) */
+      EXCEPTION(EX_StackUnder);
+      if ( control_word & CW_Invalid )
+        {
+          /* The masked response */
+          /* Put out the QNaN indefinite */
+          RE_ENTRANT_CHECK_OFF;
+          FPU_access_ok(VERIFY_WRITE,dfloat,8);
+          FPU_put_user(0, (unsigned long __user *) dfloat);
+          FPU_put_user(0xfff80000, 1 + (unsigned long __user *) dfloat);
+          RE_ENTRANT_CHECK_ON;
+          return 1;
+        }
+      else
+        return 0;
+    }
+  if ( getsign(st0_ptr) )
+    l[1] |= 0x80000000;
+
+  RE_ENTRANT_CHECK_OFF;
+  FPU_access_ok(VERIFY_WRITE,dfloat,8);
+  FPU_put_user(l[0], (unsigned long __user *)dfloat);
+  FPU_put_user(l[1], 1 + (unsigned long __user *)dfloat);
+  RE_ENTRANT_CHECK_ON;
+
+  return 1;
+}
+
+
+/* Put a float into user memory */
+int FPU_store_single(FPU_REG *st0_ptr, u_char st0_tag, float __user *single)
+{
+  long templ = 0;
+  unsigned long increment = 0;          /* avoid gcc warnings */
+  int precision_loss;
+  int exp;
+  FPU_REG tmp;
+
+  if ( st0_tag == TAG_Valid )
+    {
+
+      reg_copy(st0_ptr, &tmp);
+      exp = exponent(&tmp);
+
+      if ( exp < SINGLE_Emin )
+        {
+          addexponent(&tmp, -SINGLE_Emin + 23);  /* largest exp to be 22 */
+
+        denormal_arg:
+
+          if ( (precision_loss = FPU_round_to_int(&tmp, st0_tag)) )
+            {
+#ifdef PECULIAR_486
+              /* Did it round to a non-denormal ? */
+              /* This behaviour might be regarded as peculiar, it appears
+                 that the 80486 rounds to the dest precision, then
+                 converts to decide underflow. */
+              if ( !((tmp.sigl == 0x00800000) &&
+                  ((st0_ptr->sigh & 0x000000ff) || st0_ptr->sigl)) )
+#endif /* PECULIAR_486 */
+                {
+                  EXCEPTION(EX_Underflow);
+                  /* This is a special case: see sec 16.2.5.1 of
+                     the 80486 book */
+                  if ( !(control_word & CW_Underflow) )
+                    return 0;
+                }
+              EXCEPTION(precision_loss);
+              if ( !(control_word & CW_Precision) )
+                return 0;
+            }
+          templ = tmp.sigl;
+      }
+      else
+        {
+          if ( tmp.sigl | (tmp.sigh & 0x000000ff) )
+            {
+              unsigned long sigh = tmp.sigh;
+              unsigned long sigl = tmp.sigl;
+              
+              precision_loss = 1;
+              switch (control_word & CW_RC)
+                {
+                case RC_RND:
+                  increment = ((sigh & 0xff) > 0x80)       /* more than half */
+                    || (((sigh & 0xff) == 0x80) && sigl)   /* more than half */
+                    || ((sigh & 0x180) == 0x180);        /* round to even */
+                  break;
+                case RC_DOWN:   /* towards -infinity */
+                  increment = signpositive(&tmp)
+                    ? 0 : (sigl | (sigh & 0xff));
+                  break;
+                case RC_UP:     /* towards +infinity */
+                  increment = signpositive(&tmp)
+                    ? (sigl | (sigh & 0xff)) : 0;
+                  break;
+                case RC_CHOP:
+                  increment = 0;
+                  break;
+                }
+          
+              /* Truncate part of the mantissa */
+              tmp.sigl = 0;
+          
+              if (increment)
+                {
+                  if ( sigh >= 0xffffff00 )
+                    {
+                      /* The sigh part overflows */
+                      tmp.sigh = 0x80000000;
+                      exp++;
+                      if ( exp >= EXP_OVER )
+                        goto overflow;
+                    }
+                  else
+                    {
+                      tmp.sigh &= 0xffffff00;
+                      tmp.sigh += 0x100;
+                    }
+                }
+              else
+                {
+                  tmp.sigh &= 0xffffff00;  /* Finish the truncation */
+                }
+            }
+          else
+            precision_loss = 0;
+      
+          templ = (tmp.sigh >> 8) & 0x007fffff;
+
+          if ( exp > SINGLE_Emax )
+            {
+            overflow:
+              EXCEPTION(EX_Overflow);
+              if ( !(control_word & CW_Overflow) )
+                return 0;
+              set_precision_flag_up();
+              if ( !(control_word & CW_Precision) )
+                return 0;
+
+              /* This is a special case: see sec 16.2.5.1 of the 80486 book. */
+              /* Masked response is overflow to infinity. */
+              templ = 0x7f800000;
+            }
+          else
+            {
+              if ( precision_loss )
+                {
+                  if ( increment )
+                    set_precision_flag_up();
+                  else
+                    set_precision_flag_down();
+                }
+              /* Add the exponent */
+              templ |= ((exp+SINGLE_Ebias) & 0xff) << 23;
+            }
+        }
+    }
+  else if (st0_tag == TAG_Zero)
+    {
+      templ = 0;
+    }
+  else if ( st0_tag == TAG_Special )
+    {
+      st0_tag = FPU_Special(st0_ptr);
+      if (st0_tag == TW_Denormal)
+        {
+          reg_copy(st0_ptr, &tmp);
+
+          /* A denormal will always underflow. */
+#ifndef PECULIAR_486
+          /* An 80486 is supposed to be able to generate
+             a denormal exception here, but... */
+          /* Underflow has priority. */
+          if ( control_word & CW_Underflow )
+            denormal_operand();
+#endif /* PECULIAR_486 */ 
+          goto denormal_arg;
+        }
+      else if (st0_tag == TW_Infinity)
+        {
+          templ = 0x7f800000;
+        }
+      else if (st0_tag == TW_NaN)
+        {
+          /* Is it really a NaN ? */
+          if ( (exponent(st0_ptr) == EXP_OVER) && (st0_ptr->sigh & 0x80000000) )
+            {
+              /* See if we can get a valid NaN from the FPU_REG */
+              templ = st0_ptr->sigh >> 8;
+              if ( !(st0_ptr->sigh & 0x40000000) )
+                {
+                  /* It is a signalling NaN */
+                  EXCEPTION(EX_Invalid);
+                  if ( !(control_word & CW_Invalid) )
+                    return 0;
+                  templ |= (0x40000000 >> 8);
+                }
+              templ |= 0x7f800000;
+            }
+          else
+            {
+              /* It is an unsupported data type */
+              EXCEPTION(EX_Invalid);
+              if ( !(control_word & CW_Invalid) )
+                return 0;
+              templ = 0xffc00000;
+            }
+        }
+#ifdef PARANOID
+      else
+        {
+          EXCEPTION(EX_INTERNAL|0x164);
+          return 0;
+        }
+#endif
+    }
+  else if ( st0_tag == TAG_Empty )
+    {
+      /* Empty register (stack underflow) */
+      EXCEPTION(EX_StackUnder);
+      if ( control_word & EX_Invalid )
+        {
+          /* The masked response */
+          /* Put out the QNaN indefinite */
+          RE_ENTRANT_CHECK_OFF;
+          FPU_access_ok(VERIFY_WRITE,single,4);
+          FPU_put_user(0xffc00000, (unsigned long __user *) single);
+          RE_ENTRANT_CHECK_ON;
+          return 1;
+        }
+      else
+        return 0;
+    }
+#ifdef PARANOID
+  else
+    {
+      EXCEPTION(EX_INTERNAL|0x163);
+      return 0;
+    }
+#endif
+  if ( getsign(st0_ptr) )
+    templ |= 0x80000000;
+
+  RE_ENTRANT_CHECK_OFF;
+  FPU_access_ok(VERIFY_WRITE,single,4);
+  FPU_put_user(templ,(unsigned long __user *) single);
+  RE_ENTRANT_CHECK_ON;
+
+  return 1;
+}
+
+
+/* Put a long long into user memory */
+int FPU_store_int64(FPU_REG *st0_ptr, u_char st0_tag, long long __user *d)
+{
+  FPU_REG t;
+  long long tll;
+  int precision_loss;
+
+  if ( st0_tag == TAG_Empty )
+    {
+      /* Empty register (stack underflow) */
+      EXCEPTION(EX_StackUnder);
+      goto invalid_operand;
+    }
+  else if ( st0_tag == TAG_Special )
+    {
+      st0_tag = FPU_Special(st0_ptr);
+      if ( (st0_tag == TW_Infinity) ||
+           (st0_tag == TW_NaN) )
+        {
+          EXCEPTION(EX_Invalid);
+          goto invalid_operand;
+        }
+    }
+
+  reg_copy(st0_ptr, &t);
+  precision_loss = FPU_round_to_int(&t, st0_tag);
+  ((long *)&tll)[0] = t.sigl;
+  ((long *)&tll)[1] = t.sigh;
+  if ( (precision_loss == 1) ||
+      ((t.sigh & 0x80000000) &&
+       !((t.sigh == 0x80000000) && (t.sigl == 0) &&
+         signnegative(&t))) )
+    {
+      EXCEPTION(EX_Invalid);
+      /* This is a special case: see sec 16.2.5.1 of the 80486 book */
+    invalid_operand:
+      if ( control_word & EX_Invalid )
+        {
+          /* Produce something like QNaN "indefinite" */
+          tll = 0x8000000000000000LL;
+        }
+      else
+        return 0;
+    }
+  else
+    {
+      if ( precision_loss )
+        set_precision_flag(precision_loss);
+      if ( signnegative(&t) )
+        tll = - tll;
+    }
+
+  RE_ENTRANT_CHECK_OFF;
+  FPU_access_ok(VERIFY_WRITE,d,8);
+  copy_to_user(d, &tll, 8);
+  RE_ENTRANT_CHECK_ON;
+
+  return 1;
+}
+
+
+/* Put a long into user memory */
+int FPU_store_int32(FPU_REG *st0_ptr, u_char st0_tag, long __user *d)
+{
+  FPU_REG t;
+  int precision_loss;
+
+  if ( st0_tag == TAG_Empty )
+    {
+      /* Empty register (stack underflow) */
+      EXCEPTION(EX_StackUnder);
+      goto invalid_operand;
+    }
+  else if ( st0_tag == TAG_Special )
+    {
+      st0_tag = FPU_Special(st0_ptr);
+      if ( (st0_tag == TW_Infinity) ||
+           (st0_tag == TW_NaN) )
+        {
+          EXCEPTION(EX_Invalid);
+          goto invalid_operand;
+        }
+    }
+
+  reg_copy(st0_ptr, &t);
+  precision_loss = FPU_round_to_int(&t, st0_tag);
+  if (t.sigh ||
+      ((t.sigl & 0x80000000) &&
+       !((t.sigl == 0x80000000) && signnegative(&t))) )
+    {
+      EXCEPTION(EX_Invalid);
+      /* This is a special case: see sec 16.2.5.1 of the 80486 book */
+    invalid_operand:
+      if ( control_word & EX_Invalid )
+        {
+          /* Produce something like QNaN "indefinite" */
+          t.sigl = 0x80000000;
+        }
+      else
+        return 0;
+    }
+  else
+    {
+      if ( precision_loss )
+        set_precision_flag(precision_loss);
+      if ( signnegative(&t) )
+        t.sigl = -(long)t.sigl;
+    }
+
+  RE_ENTRANT_CHECK_OFF;
+  FPU_access_ok(VERIFY_WRITE,d,4);
+  FPU_put_user(t.sigl, (unsigned long __user *) d);
+  RE_ENTRANT_CHECK_ON;
+
+  return 1;
+}
+
+
+/* Put a short into user memory */
+int FPU_store_int16(FPU_REG *st0_ptr, u_char st0_tag, short __user *d)
+{
+  FPU_REG t;
+  int precision_loss;
+
+  if ( st0_tag == TAG_Empty )
+    {
+      /* Empty register (stack underflow) */
+      EXCEPTION(EX_StackUnder);
+      goto invalid_operand;
+    }
+  else if ( st0_tag == TAG_Special )
+    {
+      st0_tag = FPU_Special(st0_ptr);
+      if ( (st0_tag == TW_Infinity) ||
+           (st0_tag == TW_NaN) )
+        {
+          EXCEPTION(EX_Invalid);
+          goto invalid_operand;
+        }
+    }
+
+  reg_copy(st0_ptr, &t);
+  precision_loss = FPU_round_to_int(&t, st0_tag);
+  if (t.sigh ||
+      ((t.sigl & 0xffff8000) &&
+       !((t.sigl == 0x8000) && signnegative(&t))) )
+    {
+      EXCEPTION(EX_Invalid);
+      /* This is a special case: see sec 16.2.5.1 of the 80486 book */
+    invalid_operand:
+      if ( control_word & EX_Invalid )
+        {
+          /* Produce something like QNaN "indefinite" */
+          t.sigl = 0x8000;
+        }
+      else
+        return 0;
+    }
+  else
+    {
+      if ( precision_loss )
+        set_precision_flag(precision_loss);
+      if ( signnegative(&t) )
+        t.sigl = -t.sigl;
+    }
+
+  RE_ENTRANT_CHECK_OFF;
+  FPU_access_ok(VERIFY_WRITE,d,2);
+  FPU_put_user((short)t.sigl, d);
+  RE_ENTRANT_CHECK_ON;
+
+  return 1;
+}
+
+
+/* Put a packed bcd array into user memory */
+int FPU_store_bcd(FPU_REG *st0_ptr, u_char st0_tag, u_char __user *d)
+{
+  FPU_REG t;
+  unsigned long long ll;
+  u_char b;
+  int i, precision_loss;
+  u_char sign = (getsign(st0_ptr) == SIGN_NEG) ? 0x80 : 0;
+
+  if ( st0_tag == TAG_Empty )
+    {
+      /* Empty register (stack underflow) */
+      EXCEPTION(EX_StackUnder);
+      goto invalid_operand;
+    }
+  else if ( st0_tag == TAG_Special )
+    {
+      st0_tag = FPU_Special(st0_ptr);
+      if ( (st0_tag == TW_Infinity) ||
+           (st0_tag == TW_NaN) )
+        {
+          EXCEPTION(EX_Invalid);
+          goto invalid_operand;
+        }
+    }
+
+  reg_copy(st0_ptr, &t);
+  precision_loss = FPU_round_to_int(&t, st0_tag);
+  ll = significand(&t);
+
+  /* Check for overflow, by comparing with 999999999999999999 decimal. */
+  if ( (t.sigh > 0x0de0b6b3) ||
+      ((t.sigh == 0x0de0b6b3) && (t.sigl > 0xa763ffff)) )
+    {
+      EXCEPTION(EX_Invalid);
+      /* This is a special case: see sec 16.2.5.1 of the 80486 book */
+    invalid_operand:
+      if ( control_word & CW_Invalid )
+        {
+          /* Produce the QNaN "indefinite" */
+          RE_ENTRANT_CHECK_OFF;
+          FPU_access_ok(VERIFY_WRITE,d,10);
+          for ( i = 0; i < 7; i++)
+            FPU_put_user(0, d+i); /* These bytes "undefined" */
+          FPU_put_user(0xc0, d+7); /* This byte "undefined" */
+          FPU_put_user(0xff, d+8);
+          FPU_put_user(0xff, d+9);
+          RE_ENTRANT_CHECK_ON;
+          return 1;
+        }
+      else
+        return 0;
+    }
+  else if ( precision_loss )
+    {
+      /* Precision loss doesn't stop the data transfer */
+      set_precision_flag(precision_loss);
+    }
+
+  RE_ENTRANT_CHECK_OFF;
+  FPU_access_ok(VERIFY_WRITE,d,10);
+  RE_ENTRANT_CHECK_ON;
+  for ( i = 0; i < 9; i++)
+    {
+      b = FPU_div_small(&ll, 10);
+      b |= (FPU_div_small(&ll, 10)) << 4;
+      RE_ENTRANT_CHECK_OFF;
+      FPU_put_user(b, d+i);
+      RE_ENTRANT_CHECK_ON;
+    }
+  RE_ENTRANT_CHECK_OFF;
+  FPU_put_user(sign, d+9);
+  RE_ENTRANT_CHECK_ON;
+
+  return 1;
+}
+
+/*===========================================================================*/
+
+/* r gets mangled such that sig is int, sign: 
+   it is NOT normalized */
+/* The return value (in eax) is zero if the result is exact,
+   if bits are changed due to rounding, truncation, etc, then
+   a non-zero value is returned */
+/* Overflow is signalled by a non-zero return value (in eax).
+   In the case of overflow, the returned significand always has the
+   largest possible value */
+int FPU_round_to_int(FPU_REG *r, u_char tag)
+{
+  u_char     very_big;
+  unsigned eax;
+
+  if (tag == TAG_Zero)
+    {
+      /* Make sure that zero is returned */
+      significand(r) = 0;
+      return 0;        /* o.k. */
+    }
+
+  if (exponent(r) > 63)
+    {
+      r->sigl = r->sigh = ~0;      /* The largest representable number */
+      return 1;        /* overflow */
+    }
+
+  eax = FPU_shrxs(&r->sigl, 63 - exponent(r));
+  very_big = !(~(r->sigh) | ~(r->sigl));  /* test for 0xfff...fff */
+#define half_or_more    (eax & 0x80000000)
+#define frac_part       (eax)
+#define more_than_half  ((eax & 0x80000001) == 0x80000001)
+  switch (control_word & CW_RC)
+    {
+    case RC_RND:
+      if ( more_than_half                       /* nearest */
+          || (half_or_more && (r->sigl & 1)) )  /* odd -> even */
+        {
+          if ( very_big ) return 1;        /* overflow */
+          significand(r) ++;
+          return PRECISION_LOST_UP;
+        }
+      break;
+    case RC_DOWN:
+      if (frac_part && getsign(r))
+        {
+          if ( very_big ) return 1;        /* overflow */
+          significand(r) ++;
+          return PRECISION_LOST_UP;
+        }
+      break;
+    case RC_UP:
+      if (frac_part && !getsign(r))
+        {
+          if ( very_big ) return 1;        /* overflow */
+          significand(r) ++;
+          return PRECISION_LOST_UP;
+        }
+      break;
+    case RC_CHOP:
+      break;
+    }
+
+  return eax ? PRECISION_LOST_DOWN : 0;
+
+}
+
+/*===========================================================================*/
+
+u_char __user *fldenv(fpu_addr_modes addr_modes, u_char __user *s)
+{
+  unsigned short tag_word = 0;
+  u_char tag;
+  int i;
+
+  if ( (addr_modes.default_mode == VM86) ||
+      ((addr_modes.default_mode == PM16)
+      ^ (addr_modes.override.operand_size == OP_SIZE_PREFIX)) )
+    {
+      RE_ENTRANT_CHECK_OFF;
+      FPU_access_ok(VERIFY_READ, s, 0x0e);
+      FPU_get_user(control_word, (unsigned short __user *) s);
+      FPU_get_user(partial_status, (unsigned short __user *) (s+2));
+      FPU_get_user(tag_word, (unsigned short __user *) (s+4));
+      FPU_get_user(instruction_address.offset, (unsigned short __user *) (s+6));
+      FPU_get_user(instruction_address.selector, (unsigned short __user *) (s+8));
+      FPU_get_user(operand_address.offset, (unsigned short __user *) (s+0x0a));
+      FPU_get_user(operand_address.selector, (unsigned short __user *) (s+0x0c));
+      RE_ENTRANT_CHECK_ON;
+      s += 0x0e;
+      if ( addr_modes.default_mode == VM86 )
+        {
+          instruction_address.offset
+            += (instruction_address.selector & 0xf000) << 4;
+          operand_address.offset += (operand_address.selector & 0xf000) << 4;
+        }
+    }
+  else
+    {
+      RE_ENTRANT_CHECK_OFF;
+      FPU_access_ok(VERIFY_READ, s, 0x1c);
+      FPU_get_user(control_word, (unsigned short __user *) s);
+      FPU_get_user(partial_status, (unsigned short __user *) (s+4));
+      FPU_get_user(tag_word, (unsigned short __user *) (s+8));
+      FPU_get_user(instruction_address.offset, (unsigned long __user *) (s+0x0c));
+      FPU_get_user(instruction_address.selector, (unsigned short __user *) (s+0x10));
+      FPU_get_user(instruction_address.opcode, (unsigned short __user *) (s+0x12));
+      FPU_get_user(operand_address.offset, (unsigned long __user *) (s+0x14));
+      FPU_get_user(operand_address.selector, (unsigned long __user *) (s+0x18));
+      RE_ENTRANT_CHECK_ON;
+      s += 0x1c;
+    }
+
+#ifdef PECULIAR_486
+  control_word &= ~0xe080;
+#endif /* PECULIAR_486 */ 
+
+  top = (partial_status >> SW_Top_Shift) & 7;
+
+  if ( partial_status & ~control_word & CW_Exceptions )
+    partial_status |= (SW_Summary | SW_Backward);
+  else
+    partial_status &= ~(SW_Summary | SW_Backward);
+
+  for ( i = 0; i < 8; i++ )
+    {
+      tag = tag_word & 3;
+      tag_word >>= 2;
+
+      if ( tag == TAG_Empty )
+        /* New tag is empty.  Accept it */
+        FPU_settag(i, TAG_Empty);
+      else if ( FPU_gettag(i) == TAG_Empty )
+        {
+          /* Old tag is empty and new tag is not empty.  New tag is determined
+             by old reg contents */
+          if ( exponent(&fpu_register(i)) == - EXTENDED_Ebias )
+            {
+              if ( !(fpu_register(i).sigl | fpu_register(i).sigh) )
+                FPU_settag(i, TAG_Zero);
+              else
+                FPU_settag(i, TAG_Special);
+            }
+          else if ( exponent(&fpu_register(i)) == 0x7fff - EXTENDED_Ebias )
+            {
+              FPU_settag(i, TAG_Special);
+            }
+          else if ( fpu_register(i).sigh & 0x80000000 )
+            FPU_settag(i, TAG_Valid);
+          else
+            FPU_settag(i, TAG_Special);   /* An Un-normal */
+        }
+      /* Else old tag is not empty and new tag is not empty.  Old tag
+         remains correct */
+    }
+
+  return s;
+}
+
+
+void frstor(fpu_addr_modes addr_modes, u_char __user *data_address)
+{
+  int i, regnr;
+  u_char __user *s = fldenv(addr_modes, data_address);
+  int offset = (top & 7) * 10, other = 80 - offset;
+
+  /* Copy all registers in stack order. */
+  RE_ENTRANT_CHECK_OFF;
+  FPU_access_ok(VERIFY_READ,s,80);
+  __copy_from_user(register_base+offset, s, other);
+  if ( offset )
+    __copy_from_user(register_base, s+other, offset);
+  RE_ENTRANT_CHECK_ON;
+
+  for ( i = 0; i < 8; i++ )
+    {
+      regnr = (i+top) & 7;
+      if ( FPU_gettag(regnr) != TAG_Empty )
+        /* The loaded data over-rides all other cases. */
+        FPU_settag(regnr, FPU_tagof(&st(i)));
+    }
+
+}
+
+
+u_char __user *fstenv(fpu_addr_modes addr_modes, u_char __user *d)
+{
+  if ( (addr_modes.default_mode == VM86) ||
+      ((addr_modes.default_mode == PM16)
+      ^ (addr_modes.override.operand_size == OP_SIZE_PREFIX)) )
+    {
+      RE_ENTRANT_CHECK_OFF;
+      FPU_access_ok(VERIFY_WRITE,d,14);
+#ifdef PECULIAR_486
+      FPU_put_user(control_word & ~0xe080, (unsigned long __user *) d);
+#else
+      FPU_put_user(control_word, (unsigned short __user *) d);
+#endif /* PECULIAR_486 */
+      FPU_put_user(status_word(), (unsigned short __user *) (d+2));
+      FPU_put_user(fpu_tag_word, (unsigned short __user *) (d+4));
+      FPU_put_user(instruction_address.offset, (unsigned short __user *) (d+6));
+      FPU_put_user(operand_address.offset, (unsigned short __user *) (d+0x0a));
+      if ( addr_modes.default_mode == VM86 )
+        {
+          FPU_put_user((instruction_address.offset & 0xf0000) >> 4,
+                      (unsigned short __user *) (d+8));
+          FPU_put_user((operand_address.offset & 0xf0000) >> 4,
+                      (unsigned short __user *) (d+0x0c));
+        }
+      else
+        {
+          FPU_put_user(instruction_address.selector, (unsigned short __user *) (d+8));
+          FPU_put_user(operand_address.selector, (unsigned short __user *) (d+0x0c));
+        }
+      RE_ENTRANT_CHECK_ON;
+      d += 0x0e;
+    }
+  else
+    {
+      RE_ENTRANT_CHECK_OFF;
+      FPU_access_ok(VERIFY_WRITE, d, 7*4);
+#ifdef PECULIAR_486
+      control_word &= ~0xe080;
+      /* An 80486 sets nearly all of the reserved bits to 1. */
+      control_word |= 0xffff0040;
+      partial_status = status_word() | 0xffff0000;
+      fpu_tag_word |= 0xffff0000;
+      I387.soft.fcs &= ~0xf8000000;
+      I387.soft.fos |= 0xffff0000;
+#endif /* PECULIAR_486 */
+      __copy_to_user(d, &control_word, 7*4);
+      RE_ENTRANT_CHECK_ON;
+      d += 0x1c;
+    }
+  
+  control_word |= CW_Exceptions;
+  partial_status &= ~(SW_Summary | SW_Backward);
+
+  return d;
+}
+
+
+void fsave(fpu_addr_modes addr_modes, u_char __user *data_address)
+{
+  u_char __user *d;
+  int offset = (top & 7) * 10, other = 80 - offset;
+
+  d = fstenv(addr_modes, data_address);
+
+  RE_ENTRANT_CHECK_OFF;
+  FPU_access_ok(VERIFY_WRITE,d,80);
+
+  /* Copy all registers in stack order. */
+  __copy_to_user(d, register_base+offset, other);
+  if ( offset )
+    __copy_to_user(d+other, register_base, offset);
+  RE_ENTRANT_CHECK_ON;
+
+  finit();
+}
+
+/*===========================================================================*/
diff --git a/arch/i386/math-emu/reg_mul.c b/arch/i386/math-emu/reg_mul.c
new file mode 100644
index 000000000000..40f50b61bc67
--- /dev/null
+++ b/arch/i386/math-emu/reg_mul.c
@@ -0,0 +1,132 @@
+/*---------------------------------------------------------------------------+
+ |  reg_mul.c                                                                |
+ |                                                                           |
+ | Multiply one FPU_REG by another, put the result in a destination FPU_REG. |
+ |                                                                           |
+ | Copyright (C) 1992,1993,1997                                              |
+ |                  W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia |
+ |                  E-mail   billm@suburbia.net                              |
+ |                                                                           |
+ | Returns the tag of the result if no exceptions or errors occurred.        |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------+
+ | The destination may be any FPU_REG, including one of the source FPU_REGs. |
+ +---------------------------------------------------------------------------*/
+
+#include "fpu_emu.h"
+#include "exception.h"
+#include "reg_constant.h"
+#include "fpu_system.h"
+
+
+/*
+  Multiply two registers to give a register result.
+  The sources are st(deststnr) and (b,tagb,signb).
+  The destination is st(deststnr).
+  */
+/* This routine must be called with non-empty source registers */
+int FPU_mul(FPU_REG const *b, u_char tagb, int deststnr, int control_w)
+{
+  FPU_REG *a = &st(deststnr);
+  FPU_REG *dest = a;
+  u_char taga = FPU_gettagi(deststnr);
+  u_char saved_sign = getsign(dest);
+  u_char sign = (getsign(a) ^ getsign(b));
+  int tag;
+
+
+  if ( !(taga | tagb) )
+    {
+      /* Both regs Valid, this should be the most common case. */
+
+      tag = FPU_u_mul(a, b, dest, control_w, sign, exponent(a) + exponent(b));
+      if ( tag < 0 )
+        {
+          setsign(dest, saved_sign);
+          return tag;
+        }
+      FPU_settagi(deststnr, tag);
+      return tag;
+    }
+
+  if ( taga == TAG_Special )
+    taga = FPU_Special(a);
+  if ( tagb == TAG_Special )
+    tagb = FPU_Special(b);
+
+  if ( ((taga == TAG_Valid) && (tagb == TW_Denormal))
+            || ((taga == TW_Denormal) && (tagb == TAG_Valid))
+            || ((taga == TW_Denormal) && (tagb == TW_Denormal)) )
+    {
+      FPU_REG x, y;
+      if ( denormal_operand() < 0 )
+        return FPU_Exception;
+
+      FPU_to_exp16(a, &x);
+      FPU_to_exp16(b, &y);
+      tag = FPU_u_mul(&x, &y, dest, control_w, sign,
+                      exponent16(&x) + exponent16(&y));
+      if ( tag < 0 )
+        {
+          setsign(dest, saved_sign);
+          return tag;
+        }
+      FPU_settagi(deststnr, tag);
+      return tag;
+    }
+  else if ( (taga <= TW_Denormal) && (tagb <= TW_Denormal) )
+    {
+      if ( ((tagb == TW_Denormal) || (taga == TW_Denormal))
+           && (denormal_operand() < 0) )
+        return FPU_Exception;
+
+      /* Must have either both arguments == zero, or
+         one valid and the other zero.
+         The result is therefore zero. */
+      FPU_copy_to_regi(&CONST_Z, TAG_Zero, deststnr);
+      /* The 80486 book says that the answer is +0, but a real
+         80486 behaves this way.
+         IEEE-754 apparently says it should be this way. */
+      setsign(dest, sign);
+      return TAG_Zero;
+    }
+      /* Must have infinities, NaNs, etc */
+  else if ( (taga == TW_NaN) || (tagb == TW_NaN) )
+    {
+      return real_2op_NaN(b, tagb, deststnr, &st(0));
+    }
+  else if ( ((taga == TW_Infinity) && (tagb == TAG_Zero))
+            || ((tagb == TW_Infinity) && (taga == TAG_Zero)) )
+    {
+      return arith_invalid(deststnr);  /* Zero*Infinity is invalid */
+    }
+  else if ( ((taga == TW_Denormal) || (tagb == TW_Denormal))
+            && (denormal_operand() < 0) )
+    {
+      return FPU_Exception;
+    }
+  else if (taga == TW_Infinity)
+    {
+      FPU_copy_to_regi(a, TAG_Special, deststnr);
+      setsign(dest, sign);
+      return TAG_Special;
+    }
+  else if (tagb == TW_Infinity)
+    {
+      FPU_copy_to_regi(b, TAG_Special, deststnr);
+      setsign(dest, sign);
+      return TAG_Special;
+    }
+
+#ifdef PARANOID
+  else
+    {
+      EXCEPTION(EX_INTERNAL|0x102);
+      return FPU_Exception;
+    }
+#endif /* PARANOID */ 
+
+        return 0;
+}
diff --git a/arch/i386/math-emu/reg_norm.S b/arch/i386/math-emu/reg_norm.S
new file mode 100644
index 000000000000..8b6352efceef
--- /dev/null
+++ b/arch/i386/math-emu/reg_norm.S
@@ -0,0 +1,147 @@
+/*---------------------------------------------------------------------------+
+ |  reg_norm.S                                                               |
+ |                                                                           |
+ | Copyright (C) 1992,1993,1994,1995,1997                                    |
+ |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
+ |                       Australia.  E-mail billm@suburbia.net               |
+ |                                                                           |
+ | Normalize the value in a FPU_REG.                                         |
+ |                                                                           |
+ | Call from C as:                                                           |
+ |    int FPU_normalize(FPU_REG *n)                                          |
+ |                                                                           |
+ |    int FPU_normalize_nuo(FPU_REG *n)                                      |
+ |                                                                           |
+ |    Return value is the tag of the answer, or-ed with FPU_Exception if     |
+ |    one was raised, or -1 on internal error.                               |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+#include "fpu_emu.h"
+
+
+.text
+ENTRY(FPU_normalize)
+        pushl   %ebp
+        movl    %esp,%ebp
+        pushl   %ebx
+
+        movl    PARAM1,%ebx
+
+        movl    SIGH(%ebx),%edx
+        movl    SIGL(%ebx),%eax
+
+        orl     %edx,%edx       /* ms bits */
+        js      L_done          /* Already normalized */
+        jnz     L_shift_1       /* Shift left 1 - 31 bits */
+
+        orl     %eax,%eax
+        jz      L_zero          /* The contents are zero */
+
+        movl    %eax,%edx
+        xorl    %eax,%eax
+        subw    $32,EXP(%ebx)   /* This can cause an underflow */
+
+/* We need to shift left by 1 - 31 bits */
+L_shift_1:
+        bsrl    %edx,%ecx       /* get the required shift in %ecx */
+        subl    $31,%ecx
+        negl    %ecx
+        shld    %cl,%eax,%edx
+        shl     %cl,%eax
+        subw    %cx,EXP(%ebx)   /* This can cause an underflow */
+
+        movl    %edx,SIGH(%ebx)
+        movl    %eax,SIGL(%ebx)
+
+L_done:
+        cmpw    EXP_OVER,EXP(%ebx)
+        jge     L_overflow
+
+        cmpw    EXP_UNDER,EXP(%ebx)
+        jle     L_underflow
+
+L_exit_valid:
+        movl    TAG_Valid,%eax
+
+        /* Convert the exponent to 80x87 form. */
+        addw    EXTENDED_Ebias,EXP(%ebx)
+        andw    $0x7fff,EXP(%ebx)
+
+L_exit:
+        popl    %ebx
+        leave
+        ret
+
+
+L_zero:
+        movw    $0,EXP(%ebx)
+        movl    TAG_Zero,%eax
+        jmp     L_exit
+
+L_underflow:
+        /* Convert the exponent to 80x87 form. */
+        addw    EXTENDED_Ebias,EXP(%ebx)
+        push    %ebx
+        call    arith_underflow
+        pop     %ebx
+        jmp     L_exit
+
+L_overflow:
+        /* Convert the exponent to 80x87 form. */
+        addw    EXTENDED_Ebias,EXP(%ebx)
+        push    %ebx
+        call    arith_overflow
+        pop     %ebx
+        jmp     L_exit
+
+
+
+/* Normalise without reporting underflow or overflow */
+ENTRY(FPU_normalize_nuo)
+        pushl   %ebp
+        movl    %esp,%ebp
+        pushl   %ebx
+
+        movl    PARAM1,%ebx
+
+        movl    SIGH(%ebx),%edx
+        movl    SIGL(%ebx),%eax
+
+        orl     %edx,%edx       /* ms bits */
+        js      L_exit_nuo_valid        /* Already normalized */
+        jnz     L_nuo_shift_1   /* Shift left 1 - 31 bits */
+
+        orl     %eax,%eax
+        jz      L_exit_nuo_zero         /* The contents are zero */
+
+        movl    %eax,%edx
+        xorl    %eax,%eax
+        subw    $32,EXP(%ebx)   /* This can cause an underflow */
+
+/* We need to shift left by 1 - 31 bits */
+L_nuo_shift_1:
+        bsrl    %edx,%ecx       /* get the required shift in %ecx */
+        subl    $31,%ecx
+        negl    %ecx
+        shld    %cl,%eax,%edx
+        shl     %cl,%eax
+        subw    %cx,EXP(%ebx)   /* This can cause an underflow */
+
+        movl    %edx,SIGH(%ebx)
+        movl    %eax,SIGL(%ebx)
+
+L_exit_nuo_valid:
+        movl    TAG_Valid,%eax
+
+        popl    %ebx
+        leave
+        ret
+
+L_exit_nuo_zero:
+        movl    TAG_Zero,%eax
+        movw    EXP_UNDER,EXP(%ebx)
+
+        popl    %ebx
+        leave
+        ret
diff --git a/arch/i386/math-emu/reg_round.S b/arch/i386/math-emu/reg_round.S
new file mode 100644
index 000000000000..d1d4e48b4f67
--- /dev/null
+++ b/arch/i386/math-emu/reg_round.S
@@ -0,0 +1,708 @@
+        .file "reg_round.S"
+/*---------------------------------------------------------------------------+
+ |  reg_round.S                                                              |
+ |                                                                           |
+ | Rounding/truncation/etc for FPU basic arithmetic functions.               |
+ |                                                                           |
+ | Copyright (C) 1993,1995,1997                                              |
+ |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
+ |                       Australia.  E-mail billm@suburbia.net               |
+ |                                                                           |
+ | This code has four possible entry points.                                 |
+ | The following must be entered by a jmp instruction:                       |
+ |   fpu_reg_round, fpu_reg_round_sqrt, and fpu_Arith_exit.                  |
+ |                                                                           |
+ | The FPU_round entry point is intended to be used by C code.               |
+ | From C, call as:                                                          |
+ |  int FPU_round(FPU_REG *arg, unsigned int extent, unsigned int control_w) |
+ |                                                                           |
+ |    Return value is the tag of the answer, or-ed with FPU_Exception if     |
+ |    one was raised, or -1 on internal error.                               |
+ |                                                                           |
+ | For correct "up" and "down" rounding, the argument must have the correct  |
+ | sign.                                                                     |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------+
+ | Four entry points.                                                        |
+ |                                                                           |
+ | Needed by both the fpu_reg_round and fpu_reg_round_sqrt entry points:     |
+ |  %eax:%ebx  64 bit significand                                            |
+ |  %edx       32 bit extension of the significand                           |
+ |  %edi       pointer to an FPU_REG for the result to be stored             |
+ |  stack      calling function must have set up a C stack frame and         |
+ |             pushed %esi, %edi, and %ebx                                   |
+ |                                                                           |
+ | Needed just for the fpu_reg_round_sqrt entry point:                       |
+ |  %cx  A control word in the same format as the FPU control word.          |
+ | Otherwise, PARAM4 must give such a value.                                 |
+ |                                                                           |
+ |                                                                           |
+ | The significand and its extension are assumed to be exact in the          |
+ | following sense:                                                          |
+ |   If the significand by itself is the exact result then the significand   |
+ |   extension (%edx) must contain 0, otherwise the significand extension    |
+ |   must be non-zero.                                                       |
+ |   If the significand extension is non-zero then the significand is        |
+ |   smaller than the magnitude of the correct exact result by an amount     |
+ |   greater than zero and less than one ls bit of the significand.          |
+ |   The significand extension is only required to have three possible       |
+ |   non-zero values:                                                        |
+ |       less than 0x80000000  <=> the significand is less than 1/2 an ls    |
+ |                                 bit smaller than the magnitude of the     |
+ |                                 true exact result.                        |
+ |         exactly 0x80000000  <=> the significand is exactly 1/2 an ls bit  |
+ |                                 smaller than the magnitude of the true    |
+ |                                 exact result.                             |
+ |    greater than 0x80000000  <=> the significand is more than 1/2 an ls    |
+ |                                 bit smaller than the magnitude of the     |
+ |                                 true exact result.                        |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------+
+ |  The code in this module has become quite complex, but it should handle   |
+ |  all of the FPU flags which are set at this stage of the basic arithmetic |
+ |  computations.                                                            |
+ |  There are a few rare cases where the results are not set identically to  |
+ |  a real FPU. These require a bit more thought because at this stage the   |
+ |  results of the code here appear to be more consistent...                 |
+ |  This may be changed in a future version.                                 |
+ +---------------------------------------------------------------------------*/
+
+
+#include "fpu_emu.h"
+#include "exception.h"
+#include "control_w.h"
+
+/* Flags for FPU_bits_lost */
+#define LOST_DOWN       $1
+#define LOST_UP         $2
+
+/* Flags for FPU_denormal */
+#define DENORMAL        $1
+#define UNMASKED_UNDERFLOW $2
+
+
+#ifndef NON_REENTRANT_FPU
+/*      Make the code re-entrant by putting
+        local storage on the stack: */
+#define FPU_bits_lost   (%esp)
+#define FPU_denormal    1(%esp)
+
+#else
+/*      Not re-entrant, so we can gain speed by putting
+        local storage in a static area: */
+.data
+        .align 4,0
+FPU_bits_lost:
+        .byte   0
+FPU_denormal:
+        .byte   0
+#endif /* NON_REENTRANT_FPU */
+
+
+.text
+.globl fpu_reg_round
+.globl fpu_Arith_exit
+
+/* Entry point when called from C */
+ENTRY(FPU_round)
+        pushl   %ebp
+        movl    %esp,%ebp
+        pushl   %esi
+        pushl   %edi
+        pushl   %ebx
+
+        movl    PARAM1,%edi
+        movl    SIGH(%edi),%eax
+        movl    SIGL(%edi),%ebx
+        movl    PARAM2,%edx
+
+fpu_reg_round:                  /* Normal entry point */
+        movl    PARAM4,%ecx
+
+#ifndef NON_REENTRANT_FPU
+        pushl   %ebx            /* adjust the stack pointer */
+#endif /* NON_REENTRANT_FPU */ 
+
+#ifdef PARANOID
+/* Cannot use this here yet */
+/*      orl     %eax,%eax */
+/*      jns     L_entry_bugged */
+#endif /* PARANOID */
+
+        cmpw    EXP_UNDER,EXP(%edi)
+        jle     L_Make_denorm                   /* The number is a de-normal */
+
+        movb    $0,FPU_denormal                 /* 0 -> not a de-normal */
+
+Denorm_done:
+        movb    $0,FPU_bits_lost                /* No bits yet lost in rounding */
+
+        movl    %ecx,%esi
+        andl    CW_PC,%ecx
+        cmpl    PR_64_BITS,%ecx
+        je      LRound_To_64
+
+        cmpl    PR_53_BITS,%ecx
+        je      LRound_To_53
+
+        cmpl    PR_24_BITS,%ecx
+        je      LRound_To_24
+
+#ifdef PECULIAR_486
+/* With the precision control bits set to 01 "(reserved)", a real 80486
+   behaves as if the precision control bits were set to 11 "64 bits" */
+        cmpl    PR_RESERVED_BITS,%ecx
+        je      LRound_To_64
+#ifdef PARANOID
+        jmp     L_bugged_denorm_486
+#endif /* PARANOID */ 
+#else
+#ifdef PARANOID
+        jmp     L_bugged_denorm /* There is no bug, just a bad control word */
+#endif /* PARANOID */ 
+#endif /* PECULIAR_486 */
+
+
+/* Round etc to 24 bit precision */
+LRound_To_24:
+        movl    %esi,%ecx
+        andl    CW_RC,%ecx
+        cmpl    RC_RND,%ecx
+        je      LRound_nearest_24
+
+        cmpl    RC_CHOP,%ecx
+        je      LCheck_truncate_24
+
+        cmpl    RC_UP,%ecx              /* Towards +infinity */
+        je      LUp_24
+
+        cmpl    RC_DOWN,%ecx            /* Towards -infinity */
+        je      LDown_24
+
+#ifdef PARANOID
+        jmp     L_bugged_round24
+#endif /* PARANOID */ 
+
+LUp_24:
+        cmpb    SIGN_POS,PARAM5
+        jne     LCheck_truncate_24      /* If negative then  up==truncate */
+
+        jmp     LCheck_24_round_up
+
+LDown_24:
+        cmpb    SIGN_POS,PARAM5
+        je      LCheck_truncate_24      /* If positive then  down==truncate */
+
+LCheck_24_round_up:
+        movl    %eax,%ecx
+        andl    $0x000000ff,%ecx
+        orl     %ebx,%ecx
+        orl     %edx,%ecx
+        jnz     LDo_24_round_up
+        jmp     L_Re_normalise
+
+LRound_nearest_24:
+        /* Do rounding of the 24th bit if needed (nearest or even) */
+        movl    %eax,%ecx
+        andl    $0x000000ff,%ecx
+        cmpl    $0x00000080,%ecx
+        jc      LCheck_truncate_24      /* less than half, no increment needed */
+
+        jne     LGreater_Half_24        /* greater than half, increment needed */
+
+        /* Possibly half, we need to check the ls bits */
+        orl     %ebx,%ebx
+        jnz     LGreater_Half_24        /* greater than half, increment needed */
+
+        orl     %edx,%edx
+        jnz     LGreater_Half_24        /* greater than half, increment needed */
+
+        /* Exactly half, increment only if 24th bit is 1 (round to even) */
+        testl   $0x00000100,%eax
+        jz      LDo_truncate_24
+
+LGreater_Half_24:                       /* Rounding: increment at the 24th bit */
+LDo_24_round_up:
+        andl    $0xffffff00,%eax        /* Truncate to 24 bits */
+        xorl    %ebx,%ebx
+        movb    LOST_UP,FPU_bits_lost
+        addl    $0x00000100,%eax
+        jmp     LCheck_Round_Overflow
+
+LCheck_truncate_24:
+        movl    %eax,%ecx
+        andl    $0x000000ff,%ecx
+        orl     %ebx,%ecx
+        orl     %edx,%ecx
+        jz      L_Re_normalise          /* No truncation needed */
+
+LDo_truncate_24:
+        andl    $0xffffff00,%eax        /* Truncate to 24 bits */
+        xorl    %ebx,%ebx
+        movb    LOST_DOWN,FPU_bits_lost
+        jmp     L_Re_normalise
+
+
+/* Round etc to 53 bit precision */
+LRound_To_53:
+        movl    %esi,%ecx
+        andl    CW_RC,%ecx
+        cmpl    RC_RND,%ecx
+        je      LRound_nearest_53
+
+        cmpl    RC_CHOP,%ecx
+        je      LCheck_truncate_53
+
+        cmpl    RC_UP,%ecx              /* Towards +infinity */
+        je      LUp_53
+
+        cmpl    RC_DOWN,%ecx            /* Towards -infinity */
+        je      LDown_53
+
+#ifdef PARANOID
+        jmp     L_bugged_round53
+#endif /* PARANOID */ 
+
+LUp_53:
+        cmpb    SIGN_POS,PARAM5
+        jne     LCheck_truncate_53      /* If negative then  up==truncate */
+
+        jmp     LCheck_53_round_up
+
+LDown_53:
+        cmpb    SIGN_POS,PARAM5
+        je      LCheck_truncate_53      /* If positive then  down==truncate */
+
+LCheck_53_round_up:
+        movl    %ebx,%ecx
+        andl    $0x000007ff,%ecx
+        orl     %edx,%ecx
+        jnz     LDo_53_round_up
+        jmp     L_Re_normalise
+
+LRound_nearest_53:
+        /* Do rounding of the 53rd bit if needed (nearest or even) */
+        movl    %ebx,%ecx
+        andl    $0x000007ff,%ecx
+        cmpl    $0x00000400,%ecx
+        jc      LCheck_truncate_53      /* less than half, no increment needed */
+
+        jnz     LGreater_Half_53        /* greater than half, increment needed */
+
+        /* Possibly half, we need to check the ls bits */
+        orl     %edx,%edx
+        jnz     LGreater_Half_53        /* greater than half, increment needed */
+
+        /* Exactly half, increment only if 53rd bit is 1 (round to even) */
+        testl   $0x00000800,%ebx
+        jz      LTruncate_53
+
+LGreater_Half_53:                       /* Rounding: increment at the 53rd bit */
+LDo_53_round_up:
+        movb    LOST_UP,FPU_bits_lost
+        andl    $0xfffff800,%ebx        /* Truncate to 53 bits */
+        addl    $0x00000800,%ebx
+        adcl    $0,%eax
+        jmp     LCheck_Round_Overflow
+
+LCheck_truncate_53:
+        movl    %ebx,%ecx
+        andl    $0x000007ff,%ecx
+        orl     %edx,%ecx
+        jz      L_Re_normalise
+
+LTruncate_53:
+        movb    LOST_DOWN,FPU_bits_lost
+        andl    $0xfffff800,%ebx        /* Truncate to 53 bits */
+        jmp     L_Re_normalise
+
+
+/* Round etc to 64 bit precision */
+LRound_To_64:
+        movl    %esi,%ecx
+        andl    CW_RC,%ecx
+        cmpl    RC_RND,%ecx
+        je      LRound_nearest_64
+
+        cmpl    RC_CHOP,%ecx
+        je      LCheck_truncate_64
+
+        cmpl    RC_UP,%ecx              /* Towards +infinity */
+        je      LUp_64
+
+        cmpl    RC_DOWN,%ecx            /* Towards -infinity */
+        je      LDown_64
+
+#ifdef PARANOID
+        jmp     L_bugged_round64
+#endif /* PARANOID */ 
+
+LUp_64:
+        cmpb    SIGN_POS,PARAM5
+        jne     LCheck_truncate_64      /* If negative then  up==truncate */
+
+        orl     %edx,%edx
+        jnz     LDo_64_round_up
+        jmp     L_Re_normalise
+
+LDown_64:
+        cmpb    SIGN_POS,PARAM5
+        je      LCheck_truncate_64      /* If positive then  down==truncate */
+
+        orl     %edx,%edx
+        jnz     LDo_64_round_up
+        jmp     L_Re_normalise
+
+LRound_nearest_64:
+        cmpl    $0x80000000,%edx
+        jc      LCheck_truncate_64
+
+        jne     LDo_64_round_up
+
+        /* Now test for round-to-even */
+        testb   $1,%bl
+        jz      LCheck_truncate_64
+
+LDo_64_round_up:
+        movb    LOST_UP,FPU_bits_lost
+        addl    $1,%ebx
+        adcl    $0,%eax
+
+LCheck_Round_Overflow:
+        jnc     L_Re_normalise
+
+        /* Overflow, adjust the result (significand to 1.0) */
+        rcrl    $1,%eax
+        rcrl    $1,%ebx
+        incw    EXP(%edi)
+        jmp     L_Re_normalise
+
+LCheck_truncate_64:
+        orl     %edx,%edx
+        jz      L_Re_normalise
+
+LTruncate_64:
+        movb    LOST_DOWN,FPU_bits_lost
+
+L_Re_normalise:
+        testb   $0xff,FPU_denormal
+        jnz     Normalise_result
+
+L_Normalised:
+        movl    TAG_Valid,%edx
+
+L_deNormalised:
+        cmpb    LOST_UP,FPU_bits_lost
+        je      L_precision_lost_up
+
+        cmpb    LOST_DOWN,FPU_bits_lost
+        je      L_precision_lost_down
+
+L_no_precision_loss:
+        /* store the result */
+
+L_Store_significand:
+        movl    %eax,SIGH(%edi)
+        movl    %ebx,SIGL(%edi)
+
+        cmpw    EXP_OVER,EXP(%edi)
+        jge     L_overflow
+
+        movl    %edx,%eax
+
+        /* Convert the exponent to 80x87 form. */
+        addw    EXTENDED_Ebias,EXP(%edi)
+        andw    $0x7fff,EXP(%edi)
+
+fpu_reg_round_signed_special_exit:
+
+        cmpb    SIGN_POS,PARAM5
+        je      fpu_reg_round_special_exit
+
+        orw     $0x8000,EXP(%edi)       /* Negative sign for the result. */
+
+fpu_reg_round_special_exit:
+
+#ifndef NON_REENTRANT_FPU
+        popl    %ebx            /* adjust the stack pointer */
+#endif /* NON_REENTRANT_FPU */ 
+
+fpu_Arith_exit:
+        popl    %ebx
+        popl    %edi
+        popl    %esi
+        leave
+        ret
+
+
+/*
+ * Set the FPU status flags to represent precision loss due to
+ * round-up.
+ */
+L_precision_lost_up:
+        push    %edx
+        push    %eax
+        call    set_precision_flag_up
+        popl    %eax
+        popl    %edx
+        jmp     L_no_precision_loss
+
+/*
+ * Set the FPU status flags to represent precision loss due to
+ * truncation.
+ */
+L_precision_lost_down:
+        push    %edx
+        push    %eax
+        call    set_precision_flag_down
+        popl    %eax
+        popl    %edx
+        jmp     L_no_precision_loss
+
+
+/*
+ * The number is a denormal (which might get rounded up to a normal)
+ * Shift the number right the required number of bits, which will
+ * have to be undone later...
+ */
+L_Make_denorm:
+        /* The action to be taken depends upon whether the underflow
+           exception is masked */
+        testb   CW_Underflow,%cl                /* Underflow mask. */
+        jz      Unmasked_underflow              /* Do not make a denormal. */
+
+        movb    DENORMAL,FPU_denormal
+
+        pushl   %ecx            /* Save */
+        movw    EXP_UNDER+1,%cx
+        subw    EXP(%edi),%cx
+
+        cmpw    $64,%cx /* shrd only works for 0..31 bits */
+        jnc     Denorm_shift_more_than_63
+
+        cmpw    $32,%cx /* shrd only works for 0..31 bits */
+        jnc     Denorm_shift_more_than_32
+
+/*
+ * We got here without jumps by assuming that the most common requirement
+ *   is for a small de-normalising shift.
+ * Shift by [1..31] bits
+ */
+        addw    %cx,EXP(%edi)
+        orl     %edx,%edx       /* extension */
+        setne   %ch             /* Save whether %edx is non-zero */
+        xorl    %edx,%edx
+        shrd    %cl,%ebx,%edx
+        shrd    %cl,%eax,%ebx
+        shr     %cl,%eax
+        orb     %ch,%dl
+        popl    %ecx
+        jmp     Denorm_done
+
+/* Shift by [32..63] bits */
+Denorm_shift_more_than_32:
+        addw    %cx,EXP(%edi)
+        subb    $32,%cl
+        orl     %edx,%edx
+        setne   %ch
+        orb     %ch,%bl
+        xorl    %edx,%edx
+        shrd    %cl,%ebx,%edx
+        shrd    %cl,%eax,%ebx
+        shr     %cl,%eax
+        orl     %edx,%edx               /* test these 32 bits */
+        setne   %cl
+        orb     %ch,%bl
+        orb     %cl,%bl
+        movl    %ebx,%edx
+        movl    %eax,%ebx
+        xorl    %eax,%eax
+        popl    %ecx
+        jmp     Denorm_done
+
+/* Shift by [64..) bits */
+Denorm_shift_more_than_63:
+        cmpw    $64,%cx
+        jne     Denorm_shift_more_than_64
+
+/* Exactly 64 bit shift */
+        addw    %cx,EXP(%edi)
+        xorl    %ecx,%ecx
+        orl     %edx,%edx
+        setne   %cl
+        orl     %ebx,%ebx
+        setne   %ch
+        orb     %ch,%cl
+        orb     %cl,%al
+        movl    %eax,%edx
+        xorl    %eax,%eax
+        xorl    %ebx,%ebx
+        popl    %ecx
+        jmp     Denorm_done
+
+Denorm_shift_more_than_64:
+        movw    EXP_UNDER+1,EXP(%edi)
+/* This is easy, %eax must be non-zero, so.. */
+        movl    $1,%edx
+        xorl    %eax,%eax
+        xorl    %ebx,%ebx
+        popl    %ecx
+        jmp     Denorm_done
+
+
+Unmasked_underflow:
+        movb    UNMASKED_UNDERFLOW,FPU_denormal
+        jmp     Denorm_done
+
+
+/* Undo the de-normalisation. */
+Normalise_result:
+        cmpb    UNMASKED_UNDERFLOW,FPU_denormal
+        je      Signal_underflow
+
+/* The number must be a denormal if we got here. */
+#ifdef PARANOID
+        /* But check it... just in case. */
+        cmpw    EXP_UNDER+1,EXP(%edi)
+        jne     L_norm_bugged
+#endif /* PARANOID */
+
+#ifdef PECULIAR_486
+        /*
+         * This implements a special feature of 80486 behaviour.
+         * Underflow will be signalled even if the number is
+         * not a denormal after rounding.
+         * This difference occurs only for masked underflow, and not
+         * in the unmasked case.
+         * Actual 80486 behaviour differs from this in some circumstances.
+         */
+        orl     %eax,%eax               /* ms bits */
+        js      LPseudoDenormal         /* Will be masked underflow */
+#else
+        orl     %eax,%eax               /* ms bits */
+        js      L_Normalised            /* No longer a denormal */
+#endif /* PECULIAR_486 */ 
+
+        jnz     LDenormal_adj_exponent
+
+        orl     %ebx,%ebx
+        jz      L_underflow_to_zero     /* The contents are zero */
+
+LDenormal_adj_exponent:
+        decw    EXP(%edi)
+
+LPseudoDenormal:
+        testb   $0xff,FPU_bits_lost     /* bits lost == underflow */
+        movl    TAG_Special,%edx
+        jz      L_deNormalised
+
+        /* There must be a masked underflow */
+        push    %eax
+        pushl   EX_Underflow
+        call    EXCEPTION
+        popl    %eax
+        popl    %eax
+        movl    TAG_Special,%edx
+        jmp     L_deNormalised
+
+
+/*
+ * The operations resulted in a number too small to represent.
+ * Masked response.
+ */
+L_underflow_to_zero:
+        push    %eax
+        call    set_precision_flag_down
+        popl    %eax
+
+        push    %eax
+        pushl   EX_Underflow
+        call    EXCEPTION
+        popl    %eax
+        popl    %eax
+
+/* Reduce the exponent to EXP_UNDER */
+        movw    EXP_UNDER,EXP(%edi)
+        movl    TAG_Zero,%edx
+        jmp     L_Store_significand
+
+
+/* The operations resulted in a number too large to represent. */
+L_overflow:
+        addw    EXTENDED_Ebias,EXP(%edi)        /* Set for unmasked response. */
+        push    %edi
+        call    arith_overflow
+        pop     %edi
+        jmp     fpu_reg_round_signed_special_exit
+
+
+Signal_underflow:
+        /* The number may have been changed to a non-denormal */
+        /* by the rounding operations. */
+        cmpw    EXP_UNDER,EXP(%edi)
+        jle     Do_unmasked_underflow
+
+        jmp     L_Normalised
+
+Do_unmasked_underflow:
+        /* Increase the exponent by the magic number */
+        addw    $(3*(1<<13)),EXP(%edi)
+        push    %eax
+        pushl   EX_Underflow
+        call    EXCEPTION
+        popl    %eax
+        popl    %eax
+        jmp     L_Normalised
+
+
+#ifdef PARANOID
+#ifdef PECULIAR_486
+L_bugged_denorm_486:
+        pushl   EX_INTERNAL|0x236
+        call    EXCEPTION
+        popl    %ebx
+        jmp     L_exception_exit
+#else
+L_bugged_denorm:
+        pushl   EX_INTERNAL|0x230
+        call    EXCEPTION
+        popl    %ebx
+        jmp     L_exception_exit
+#endif /* PECULIAR_486 */ 
+
+L_bugged_round24:
+        pushl   EX_INTERNAL|0x231
+        call    EXCEPTION
+        popl    %ebx
+        jmp     L_exception_exit
+
+L_bugged_round53:
+        pushl   EX_INTERNAL|0x232
+        call    EXCEPTION
+        popl    %ebx
+        jmp     L_exception_exit
+
+L_bugged_round64:
+        pushl   EX_INTERNAL|0x233
+        call    EXCEPTION
+        popl    %ebx
+        jmp     L_exception_exit
+
+L_norm_bugged:
+        pushl   EX_INTERNAL|0x234
+        call    EXCEPTION
+        popl    %ebx
+        jmp     L_exception_exit
+
+L_entry_bugged:
+        pushl   EX_INTERNAL|0x235
+        call    EXCEPTION
+        popl    %ebx
+L_exception_exit:
+        mov     $-1,%eax
+        jmp     fpu_reg_round_special_exit
+#endif /* PARANOID */ 
diff --git a/arch/i386/math-emu/reg_u_add.S b/arch/i386/math-emu/reg_u_add.S
new file mode 100644
index 000000000000..47c4c2434d85
--- /dev/null
+++ b/arch/i386/math-emu/reg_u_add.S
@@ -0,0 +1,167 @@
+        .file   "reg_u_add.S"
+/*---------------------------------------------------------------------------+
+ |  reg_u_add.S                                                              |
+ |                                                                           |
+ | Add two valid (TAG_Valid) FPU_REG numbers, of the same sign, and put the  |
+ |   result in a destination FPU_REG.                                        |
+ |                                                                           |
+ | Copyright (C) 1992,1993,1995,1997                                         |
+ |                  W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia |
+ |                  E-mail   billm@suburbia.net                              |
+ |                                                                           |
+ | Call from C as:                                                           |
+ |   int  FPU_u_add(FPU_REG *arg1, FPU_REG *arg2, FPU_REG *answ,             |
+ |                                                int control_w)             |
+ |    Return value is the tag of the answer, or-ed with FPU_Exception if     |
+ |    one was raised, or -1 on internal error.                               |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+/*
+ |    Kernel addition routine FPU_u_add(reg *arg1, reg *arg2, reg *answ).
+ |    Takes two valid reg f.p. numbers (TAG_Valid), which are
+ |    treated as unsigned numbers,
+ |    and returns their sum as a TAG_Valid or TAG_Special f.p. number.
+ |    The returned number is normalized.
+ |    Basic checks are performed if PARANOID is defined.
+ */
+
+#include "exception.h"
+#include "fpu_emu.h"
+#include "control_w.h"
+
+.text
+ENTRY(FPU_u_add)
+        pushl   %ebp
+        movl    %esp,%ebp
+        pushl   %esi
+        pushl   %edi
+        pushl   %ebx
+
+        movl    PARAM1,%esi             /* source 1 */
+        movl    PARAM2,%edi             /* source 2 */
+
+        movl    PARAM6,%ecx
+        movl    %ecx,%edx
+        subl    PARAM7,%ecx                     /* exp1 - exp2 */
+        jge     L_arg1_larger
+
+        /* num1 is smaller */
+        movl    SIGL(%esi),%ebx
+        movl    SIGH(%esi),%eax
+
+        movl    %edi,%esi
+        movl    PARAM7,%edx
+        negw    %cx
+        jmp     L_accum_loaded
+
+L_arg1_larger:
+        /* num1 has larger or equal exponent */
+        movl    SIGL(%edi),%ebx
+        movl    SIGH(%edi),%eax
+
+L_accum_loaded:
+        movl    PARAM3,%edi             /* destination */
+        movw    %dx,EXP(%edi)           /* Copy exponent to destination */
+
+        xorl    %edx,%edx               /* clear the extension */
+
+#ifdef PARANOID
+        testl   $0x80000000,%eax
+        je      L_bugged
+
+        testl   $0x80000000,SIGH(%esi)
+        je      L_bugged
+#endif /* PARANOID */
+
+/* The number to be shifted is in %eax:%ebx:%edx */
+        cmpw    $32,%cx         /* shrd only works for 0..31 bits */
+        jnc     L_more_than_31
+
+/* less than 32 bits */
+        shrd    %cl,%ebx,%edx
+        shrd    %cl,%eax,%ebx
+        shr     %cl,%eax
+        jmp     L_shift_done
+
+L_more_than_31:
+        cmpw    $64,%cx
+        jnc     L_more_than_63
+
+        subb    $32,%cl
+        jz      L_exactly_32
+
+        shrd    %cl,%eax,%edx
+        shr     %cl,%eax
+        orl     %ebx,%ebx
+        jz      L_more_31_no_low        /* none of the lowest bits is set */
+
+        orl     $1,%edx                 /* record the fact in the extension */
+
+L_more_31_no_low:
+        movl    %eax,%ebx
+        xorl    %eax,%eax
+        jmp     L_shift_done
+
+L_exactly_32:
+        movl    %ebx,%edx
+        movl    %eax,%ebx
+        xorl    %eax,%eax
+        jmp     L_shift_done
+
+L_more_than_63:
+        cmpw    $65,%cx
+        jnc     L_more_than_64
+
+        movl    %eax,%edx
+        orl     %ebx,%ebx
+        jz      L_more_63_no_low
+
+        orl     $1,%edx
+        jmp     L_more_63_no_low
+
+L_more_than_64:
+        movl    $1,%edx         /* The shifted nr always at least one '1' */
+
+L_more_63_no_low:
+        xorl    %ebx,%ebx
+        xorl    %eax,%eax
+
+L_shift_done:
+        /* Now do the addition */
+        addl    SIGL(%esi),%ebx
+        adcl    SIGH(%esi),%eax
+        jnc     L_round_the_result
+
+        /* Overflow, adjust the result */
+        rcrl    $1,%eax
+        rcrl    $1,%ebx
+        rcrl    $1,%edx
+        jnc     L_no_bit_lost
+
+        orl     $1,%edx
+
+L_no_bit_lost:
+        incw    EXP(%edi)
+
+L_round_the_result:
+        jmp     fpu_reg_round   /* Round the result */
+
+
+
+#ifdef PARANOID
+/* If we ever get here then we have problems! */
+L_bugged:
+        pushl   EX_INTERNAL|0x201
+        call    EXCEPTION
+        pop     %ebx
+        movl    $-1,%eax
+        jmp     L_exit
+
+L_exit:
+        popl    %ebx
+        popl    %edi
+        popl    %esi
+        leave
+        ret
+#endif /* PARANOID */
diff --git a/arch/i386/math-emu/reg_u_div.S b/arch/i386/math-emu/reg_u_div.S
new file mode 100644
index 000000000000..cc00654b6f9a
--- /dev/null
+++ b/arch/i386/math-emu/reg_u_div.S
@@ -0,0 +1,471 @@
+        .file   "reg_u_div.S"
+/*---------------------------------------------------------------------------+
+ |  reg_u_div.S                                                              |
+ |                                                                           |
+ | Divide one FPU_REG by another and put the result in a destination FPU_REG.|
+ |                                                                           |
+ | Copyright (C) 1992,1993,1995,1997                                         |
+ |                  W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia |
+ |                  E-mail   billm@suburbia.net                              |
+ |                                                                           |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------+
+ | Call from C as:                                                           |
+ |    int FPU_u_div(FPU_REG *a, FPU_REG *b, FPU_REG *dest,                   |
+ |                unsigned int control_word, char *sign)                     |
+ |                                                                           |
+ |  Does not compute the destination exponent, but does adjust it.           |
+ |                                                                           |
+ |    Return value is the tag of the answer, or-ed with FPU_Exception if     |
+ |    one was raised, or -1 on internal error.                               |
+ +---------------------------------------------------------------------------*/
+
+#include "exception.h"
+#include "fpu_emu.h"
+#include "control_w.h"
+
+
+/* #define      dSIGL(x)        (x) */
+/* #define      dSIGH(x)        4(x) */
+
+
+#ifndef NON_REENTRANT_FPU
+/*
+        Local storage on the stack:
+        Result:         FPU_accum_3:FPU_accum_2:FPU_accum_1:FPU_accum_0
+        Overflow flag:  ovfl_flag
+ */
+#define FPU_accum_3     -4(%ebp)
+#define FPU_accum_2     -8(%ebp)
+#define FPU_accum_1     -12(%ebp)
+#define FPU_accum_0     -16(%ebp)
+#define FPU_result_1    -20(%ebp)
+#define FPU_result_2    -24(%ebp)
+#define FPU_ovfl_flag   -28(%ebp)
+
+#else
+.data
+/*
+        Local storage in a static area:
+        Result:         FPU_accum_3:FPU_accum_2:FPU_accum_1:FPU_accum_0
+        Overflow flag:  ovfl_flag
+ */
+        .align 4,0
+FPU_accum_3:
+        .long   0
+FPU_accum_2:
+        .long   0
+FPU_accum_1:
+        .long   0
+FPU_accum_0:
+        .long   0
+FPU_result_1:
+        .long   0
+FPU_result_2:
+        .long   0
+FPU_ovfl_flag:
+        .byte   0
+#endif /* NON_REENTRANT_FPU */
+
+#define REGA    PARAM1
+#define REGB    PARAM2
+#define DEST    PARAM3
+
+.text
+ENTRY(FPU_u_div)
+        pushl   %ebp
+        movl    %esp,%ebp
+#ifndef NON_REENTRANT_FPU
+        subl    $28,%esp
+#endif /* NON_REENTRANT_FPU */
+
+        pushl   %esi
+        pushl   %edi
+        pushl   %ebx
+
+        movl    REGA,%esi
+        movl    REGB,%ebx
+        movl    DEST,%edi
+
+        movswl  EXP(%esi),%edx
+        movswl  EXP(%ebx),%eax
+        subl    %eax,%edx
+        addl    EXP_BIAS,%edx
+
+        /* A denormal and a large number can cause an exponent underflow */
+        cmpl    EXP_WAY_UNDER,%edx
+        jg      xExp_not_underflow
+
+        /* Set to a really low value allow correct handling */
+        movl    EXP_WAY_UNDER,%edx
+
+xExp_not_underflow:
+
+        movw    %dx,EXP(%edi)
+
+#ifdef PARANOID
+/*      testl   $0x80000000, SIGH(%esi) // Dividend */
+/*      je      L_bugged */
+        testl   $0x80000000, SIGH(%ebx) /* Divisor */
+        je      L_bugged
+#endif /* PARANOID */ 
+
+/* Check if the divisor can be treated as having just 32 bits */
+        cmpl    $0,SIGL(%ebx)
+        jnz     L_Full_Division /* Can't do a quick divide */
+
+/* We should be able to zip through the division here */
+        movl    SIGH(%ebx),%ecx /* The divisor */
+        movl    SIGH(%esi),%edx /* Dividend */
+        movl    SIGL(%esi),%eax /* Dividend */
+
+        cmpl    %ecx,%edx
+        setaeb  FPU_ovfl_flag   /* Keep a record */
+        jb      L_no_adjust
+
+        subl    %ecx,%edx       /* Prevent the overflow */
+
+L_no_adjust:
+        /* Divide the 64 bit number by the 32 bit denominator */
+        divl    %ecx
+        movl    %eax,FPU_result_2
+
+        /* Work on the remainder of the first division */
+        xorl    %eax,%eax
+        divl    %ecx
+        movl    %eax,FPU_result_1
+
+        /* Work on the remainder of the 64 bit division */
+        xorl    %eax,%eax
+        divl    %ecx
+
+        testb   $255,FPU_ovfl_flag      /* was the num > denom ? */
+        je      L_no_overflow
+
+        /* Do the shifting here */
+        /* increase the exponent */
+        incw    EXP(%edi)
+
+        /* shift the mantissa right one bit */
+        stc                     /* To set the ms bit */
+        rcrl    FPU_result_2
+        rcrl    FPU_result_1
+        rcrl    %eax
+
+L_no_overflow:
+        jmp     LRound_precision        /* Do the rounding as required */
+
+
+/*---------------------------------------------------------------------------+
+ |  Divide:   Return  arg1/arg2 to arg3.                                     |
+ |                                                                           |
+ |  This routine does not use the exponents of arg1 and arg2, but does       |
+ |  adjust the exponent of arg3.                                             |
+ |                                                                           |
+ |  The maximum returned value is (ignoring exponents)                       |
+ |               .ffffffff ffffffff                                          |
+ |               ------------------  =  1.ffffffff fffffffe                  |
+ |               .80000000 00000000                                          |
+ | and the minimum is                                                        |
+ |               .80000000 00000000                                          |
+ |               ------------------  =  .80000000 00000001   (rounded)       |
+ |               .ffffffff ffffffff                                          |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+
+L_Full_Division:
+        /* Save extended dividend in local register */
+        movl    SIGL(%esi),%eax
+        movl    %eax,FPU_accum_2
+        movl    SIGH(%esi),%eax
+        movl    %eax,FPU_accum_3
+        xorl    %eax,%eax
+        movl    %eax,FPU_accum_1        /* zero the extension */
+        movl    %eax,FPU_accum_0        /* zero the extension */
+
+        movl    SIGL(%esi),%eax /* Get the current num */
+        movl    SIGH(%esi),%edx
+
+/*----------------------------------------------------------------------*/
+/* Initialization done.
+   Do the first 32 bits. */
+
+        movb    $0,FPU_ovfl_flag
+        cmpl    SIGH(%ebx),%edx /* Test for imminent overflow */
+        jb      LLess_than_1
+        ja      LGreater_than_1
+
+        cmpl    SIGL(%ebx),%eax
+        jb      LLess_than_1
+
+LGreater_than_1:
+/* The dividend is greater or equal, would cause overflow */
+        setaeb  FPU_ovfl_flag           /* Keep a record */
+
+        subl    SIGL(%ebx),%eax
+        sbbl    SIGH(%ebx),%edx /* Prevent the overflow */
+        movl    %eax,FPU_accum_2
+        movl    %edx,FPU_accum_3
+
+LLess_than_1:
+/* At this point, we have a dividend < divisor, with a record of
+   adjustment in FPU_ovfl_flag */
+
+        /* We will divide by a number which is too large */
+        movl    SIGH(%ebx),%ecx
+        addl    $1,%ecx
+        jnc     LFirst_div_not_1
+
+        /* here we need to divide by 100000000h,
+           i.e., no division at all.. */
+        mov     %edx,%eax
+        jmp     LFirst_div_done
+
+LFirst_div_not_1:
+        divl    %ecx            /* Divide the numerator by the augmented
+                                   denom ms dw */
+
+LFirst_div_done:
+        movl    %eax,FPU_result_2       /* Put the result in the answer */
+
+        mull    SIGH(%ebx)      /* mul by the ms dw of the denom */
+
+        subl    %eax,FPU_accum_2        /* Subtract from the num local reg */
+        sbbl    %edx,FPU_accum_3
+
+        movl    FPU_result_2,%eax       /* Get the result back */
+        mull    SIGL(%ebx)      /* now mul the ls dw of the denom */
+
+        subl    %eax,FPU_accum_1        /* Subtract from the num local reg */
+        sbbl    %edx,FPU_accum_2
+        sbbl    $0,FPU_accum_3
+        je      LDo_2nd_32_bits         /* Must check for non-zero result here */
+
+#ifdef PARANOID
+        jb      L_bugged_1
+#endif /* PARANOID */ 
+
+        /* need to subtract another once of the denom */
+        incl    FPU_result_2    /* Correct the answer */
+
+        movl    SIGL(%ebx),%eax
+        movl    SIGH(%ebx),%edx
+        subl    %eax,FPU_accum_1        /* Subtract from the num local reg */
+        sbbl    %edx,FPU_accum_2
+
+#ifdef PARANOID
+        sbbl    $0,FPU_accum_3
+        jne     L_bugged_1      /* Must check for non-zero result here */
+#endif /* PARANOID */ 
+
+/*----------------------------------------------------------------------*/
+/* Half of the main problem is done, there is just a reduced numerator
+   to handle now.
+   Work with the second 32 bits, FPU_accum_0 not used from now on */
+LDo_2nd_32_bits:
+        movl    FPU_accum_2,%edx        /* get the reduced num */
+        movl    FPU_accum_1,%eax
+
+        /* need to check for possible subsequent overflow */
+        cmpl    SIGH(%ebx),%edx
+        jb      LDo_2nd_div
+        ja      LPrevent_2nd_overflow
+
+        cmpl    SIGL(%ebx),%eax
+        jb      LDo_2nd_div
+
+LPrevent_2nd_overflow:
+/* The numerator is greater or equal, would cause overflow */
+        /* prevent overflow */
+        subl    SIGL(%ebx),%eax
+        sbbl    SIGH(%ebx),%edx
+        movl    %edx,FPU_accum_2
+        movl    %eax,FPU_accum_1
+
+        incl    FPU_result_2    /* Reflect the subtraction in the answer */
+
+#ifdef PARANOID
+        je      L_bugged_2      /* Can't bump the result to 1.0 */
+#endif /* PARANOID */ 
+
+LDo_2nd_div:
+        cmpl    $0,%ecx         /* augmented denom msw */
+        jnz     LSecond_div_not_1
+
+        /* %ecx == 0, we are dividing by 1.0 */
+        mov     %edx,%eax
+        jmp     LSecond_div_done
+
+LSecond_div_not_1:
+        divl    %ecx            /* Divide the numerator by the denom ms dw */
+
+LSecond_div_done:
+        movl    %eax,FPU_result_1       /* Put the result in the answer */
+
+        mull    SIGH(%ebx)      /* mul by the ms dw of the denom */
+
+        subl    %eax,FPU_accum_1        /* Subtract from the num local reg */
+        sbbl    %edx,FPU_accum_2
+
+#ifdef PARANOID
+        jc      L_bugged_2
+#endif /* PARANOID */ 
+
+        movl    FPU_result_1,%eax       /* Get the result back */
+        mull    SIGL(%ebx)      /* now mul the ls dw of the denom */
+
+        subl    %eax,FPU_accum_0        /* Subtract from the num local reg */
+        sbbl    %edx,FPU_accum_1        /* Subtract from the num local reg */
+        sbbl    $0,FPU_accum_2
+
+#ifdef PARANOID
+        jc      L_bugged_2
+#endif /* PARANOID */ 
+
+        jz      LDo_3rd_32_bits
+
+#ifdef PARANOID
+        cmpl    $1,FPU_accum_2
+        jne     L_bugged_2
+#endif /* PARANOID */
+
+        /* need to subtract another once of the denom */
+        movl    SIGL(%ebx),%eax
+        movl    SIGH(%ebx),%edx
+        subl    %eax,FPU_accum_0        /* Subtract from the num local reg */
+        sbbl    %edx,FPU_accum_1
+        sbbl    $0,FPU_accum_2
+
+#ifdef PARANOID
+        jc      L_bugged_2
+        jne     L_bugged_2
+#endif /* PARANOID */ 
+
+        addl    $1,FPU_result_1 /* Correct the answer */
+        adcl    $0,FPU_result_2
+
+#ifdef PARANOID
+        jc      L_bugged_2      /* Must check for non-zero result here */
+#endif /* PARANOID */
+
+/*----------------------------------------------------------------------*/
+/* The division is essentially finished here, we just need to perform
+   tidying operations.
+   Deal with the 3rd 32 bits */
+LDo_3rd_32_bits:
+        movl    FPU_accum_1,%edx                /* get the reduced num */
+        movl    FPU_accum_0,%eax
+
+        /* need to check for possible subsequent overflow */
+        cmpl    SIGH(%ebx),%edx /* denom */
+        jb      LRound_prep
+        ja      LPrevent_3rd_overflow
+
+        cmpl    SIGL(%ebx),%eax /* denom */
+        jb      LRound_prep
+
+LPrevent_3rd_overflow:
+        /* prevent overflow */
+        subl    SIGL(%ebx),%eax
+        sbbl    SIGH(%ebx),%edx
+        movl    %edx,FPU_accum_1
+        movl    %eax,FPU_accum_0
+
+        addl    $1,FPU_result_1 /* Reflect the subtraction in the answer */
+        adcl    $0,FPU_result_2
+        jne     LRound_prep
+        jnc     LRound_prep
+
+        /* This is a tricky spot, there is an overflow of the answer */
+        movb    $255,FPU_ovfl_flag              /* Overflow -> 1.000 */
+
+LRound_prep:
+/*
+ * Prepare for rounding.
+ * To test for rounding, we just need to compare 2*accum with the
+ * denom.
+ */
+        movl    FPU_accum_0,%ecx
+        movl    FPU_accum_1,%edx
+        movl    %ecx,%eax
+        orl     %edx,%eax
+        jz      LRound_ovfl             /* The accumulator contains zero. */
+
+        /* Multiply by 2 */
+        clc
+        rcll    $1,%ecx
+        rcll    $1,%edx
+        jc      LRound_large            /* No need to compare, denom smaller */
+
+        subl    SIGL(%ebx),%ecx
+        sbbl    SIGH(%ebx),%edx
+        jnc     LRound_not_small
+
+        movl    $0x70000000,%eax        /* Denom was larger */
+        jmp     LRound_ovfl
+
+LRound_not_small:
+        jnz     LRound_large
+
+        movl    $0x80000000,%eax        /* Remainder was exactly 1/2 denom */
+        jmp     LRound_ovfl
+
+LRound_large:
+        movl    $0xff000000,%eax        /* Denom was smaller */
+
+LRound_ovfl:
+/* We are now ready to deal with rounding, but first we must get
+   the bits properly aligned */
+        testb   $255,FPU_ovfl_flag      /* was the num > denom ? */
+        je      LRound_precision
+
+        incw    EXP(%edi)
+
+        /* shift the mantissa right one bit */
+        stc                     /* Will set the ms bit */
+        rcrl    FPU_result_2
+        rcrl    FPU_result_1
+        rcrl    %eax
+
+/* Round the result as required */
+LRound_precision:
+        decw    EXP(%edi)       /* binary point between 1st & 2nd bits */
+
+        movl    %eax,%edx
+        movl    FPU_result_1,%ebx
+        movl    FPU_result_2,%eax
+        jmp     fpu_reg_round
+
+
+#ifdef PARANOID
+/* The logic is wrong if we got here */
+L_bugged:
+        pushl   EX_INTERNAL|0x202
+        call    EXCEPTION
+        pop     %ebx
+        jmp     L_exit
+
+L_bugged_1:
+        pushl   EX_INTERNAL|0x203
+        call    EXCEPTION
+        pop     %ebx
+        jmp     L_exit
+
+L_bugged_2:
+        pushl   EX_INTERNAL|0x204
+        call    EXCEPTION
+        pop     %ebx
+        jmp     L_exit
+
+L_exit:
+        movl    $-1,%eax
+        popl    %ebx
+        popl    %edi
+        popl    %esi
+
+        leave
+        ret
+#endif /* PARANOID */ 
diff --git a/arch/i386/math-emu/reg_u_mul.S b/arch/i386/math-emu/reg_u_mul.S
new file mode 100644
index 000000000000..973f12af97df
--- /dev/null
+++ b/arch/i386/math-emu/reg_u_mul.S
@@ -0,0 +1,148 @@
+        .file   "reg_u_mul.S"
+/*---------------------------------------------------------------------------+
+ |  reg_u_mul.S                                                              |
+ |                                                                           |
+ | Core multiplication routine                                               |
+ |                                                                           |
+ | Copyright (C) 1992,1993,1995,1997                                         |
+ |                  W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia |
+ |                  E-mail   billm@suburbia.net                              |
+ |                                                                           |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------+
+ |   Basic multiplication routine.                                           |
+ |   Does not check the resulting exponent for overflow/underflow            |
+ |                                                                           |
+ |   FPU_u_mul(FPU_REG *a, FPU_REG *b, FPU_REG *c, unsigned int cw);         |
+ |                                                                           |
+ |   Internal working is at approx 128 bits.                                 |
+ |   Result is rounded to nearest 53 or 64 bits, using "nearest or even".    |
+ +---------------------------------------------------------------------------*/
+
+#include "exception.h"
+#include "fpu_emu.h"
+#include "control_w.h"
+
+
+
+#ifndef NON_REENTRANT_FPU
+/*  Local storage on the stack: */
+#define FPU_accum_0     -4(%ebp)        /* ms word */
+#define FPU_accum_1     -8(%ebp)
+
+#else
+/*  Local storage in a static area: */
+.data
+        .align 4,0
+FPU_accum_0:
+        .long   0
+FPU_accum_1:
+        .long   0
+#endif /* NON_REENTRANT_FPU */
+
+
+.text
+ENTRY(FPU_u_mul)
+        pushl   %ebp
+        movl    %esp,%ebp
+#ifndef NON_REENTRANT_FPU
+        subl    $8,%esp
+#endif /* NON_REENTRANT_FPU */ 
+
+        pushl   %esi
+        pushl   %edi
+        pushl   %ebx
+
+        movl    PARAM1,%esi
+        movl    PARAM2,%edi
+
+#ifdef PARANOID
+        testl   $0x80000000,SIGH(%esi)
+        jz      L_bugged
+        testl   $0x80000000,SIGH(%edi)
+        jz      L_bugged
+#endif /* PARANOID */
+
+        xorl    %ecx,%ecx
+        xorl    %ebx,%ebx
+
+        movl    SIGL(%esi),%eax
+        mull    SIGL(%edi)
+        movl    %eax,FPU_accum_0
+        movl    %edx,FPU_accum_1
+
+        movl    SIGL(%esi),%eax
+        mull    SIGH(%edi)
+        addl    %eax,FPU_accum_1
+        adcl    %edx,%ebx
+/*      adcl    $0,%ecx         // overflow here is not possible */
+
+        movl    SIGH(%esi),%eax
+        mull    SIGL(%edi)
+        addl    %eax,FPU_accum_1
+        adcl    %edx,%ebx
+        adcl    $0,%ecx
+
+        movl    SIGH(%esi),%eax
+        mull    SIGH(%edi)
+        addl    %eax,%ebx
+        adcl    %edx,%ecx
+
+        /* Get the sum of the exponents. */
+        movl    PARAM6,%eax
+        subl    EXP_BIAS-1,%eax
+
+        /* Two denormals can cause an exponent underflow */
+        cmpl    EXP_WAY_UNDER,%eax
+        jg      Exp_not_underflow
+
+        /* Set to a really low value allow correct handling */
+        movl    EXP_WAY_UNDER,%eax
+
+Exp_not_underflow:
+
+/*  Have now finished with the sources */
+        movl    PARAM3,%edi     /* Point to the destination */
+        movw    %ax,EXP(%edi)
+
+/*  Now make sure that the result is normalized */
+        testl   $0x80000000,%ecx
+        jnz     LResult_Normalised
+
+        /* Normalize by shifting left one bit */
+        shll    $1,FPU_accum_0
+        rcll    $1,FPU_accum_1
+        rcll    $1,%ebx
+        rcll    $1,%ecx
+        decw    EXP(%edi)
+
+LResult_Normalised:
+        movl    FPU_accum_0,%eax
+        movl    FPU_accum_1,%edx
+        orl     %eax,%eax
+        jz      L_extent_zero
+
+        orl     $1,%edx
+
+L_extent_zero:
+        movl    %ecx,%eax
+        jmp     fpu_reg_round
+
+
+#ifdef PARANOID
+L_bugged:
+        pushl   EX_INTERNAL|0x205
+        call    EXCEPTION
+        pop     %ebx
+        jmp     L_exit
+
+L_exit:
+        popl    %ebx
+        popl    %edi
+        popl    %esi
+        leave
+        ret
+#endif /* PARANOID */ 
+
diff --git a/arch/i386/math-emu/reg_u_sub.S b/arch/i386/math-emu/reg_u_sub.S
new file mode 100644
index 000000000000..1b6c24801d22
--- /dev/null
+++ b/arch/i386/math-emu/reg_u_sub.S
@@ -0,0 +1,272 @@
+        .file   "reg_u_sub.S"
+/*---------------------------------------------------------------------------+
+ |  reg_u_sub.S                                                              |
+ |                                                                           |
+ | Core floating point subtraction routine.                                  |
+ |                                                                           |
+ | Copyright (C) 1992,1993,1995,1997                                         |
+ |                  W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia |
+ |                  E-mail   billm@suburbia.net                              |
+ |                                                                           |
+ | Call from C as:                                                           |
+ |    int FPU_u_sub(FPU_REG *arg1, FPU_REG *arg2, FPU_REG *answ,             |
+ |                                                int control_w)             |
+ |    Return value is the tag of the answer, or-ed with FPU_Exception if     |
+ |    one was raised, or -1 on internal error.                               |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+/*
+ |    Kernel subtraction routine FPU_u_sub(reg *arg1, reg *arg2, reg *answ).
+ |    Takes two valid reg f.p. numbers (TAG_Valid), which are
+ |    treated as unsigned numbers,
+ |    and returns their difference as a TAG_Valid or TAG_Zero f.p.
+ |    number.
+ |    The first number (arg1) must be the larger.
+ |    The returned number is normalized.
+ |    Basic checks are performed if PARANOID is defined.
+ */
+
+#include "exception.h"
+#include "fpu_emu.h"
+#include "control_w.h"
+
+.text
+ENTRY(FPU_u_sub)
+        pushl   %ebp
+        movl    %esp,%ebp
+        pushl   %esi
+        pushl   %edi
+        pushl   %ebx
+
+        movl    PARAM1,%esi     /* source 1 */
+        movl    PARAM2,%edi     /* source 2 */
+        
+        movl    PARAM6,%ecx
+        subl    PARAM7,%ecx     /* exp1 - exp2 */
+
+#ifdef PARANOID
+        /* source 2 is always smaller than source 1 */
+        js      L_bugged_1
+
+        testl   $0x80000000,SIGH(%edi)  /* The args are assumed to be be normalized */
+        je      L_bugged_2
+
+        testl   $0x80000000,SIGH(%esi)
+        je      L_bugged_2
+#endif /* PARANOID */
+
+/*--------------------------------------+
+ |      Form a register holding the     |
+ |      smaller number                  |
+ +--------------------------------------*/
+        movl    SIGH(%edi),%eax /* register ms word */
+        movl    SIGL(%edi),%ebx /* register ls word */
+
+        movl    PARAM3,%edi     /* destination */
+        movl    PARAM6,%edx
+        movw    %dx,EXP(%edi)   /* Copy exponent to destination */
+
+        xorl    %edx,%edx       /* register extension */
+
+/*--------------------------------------+
+ |      Shift the temporary register    |
+ |      right the required number of    |
+ |      places.                         |
+ +--------------------------------------*/
+
+        cmpw    $32,%cx         /* shrd only works for 0..31 bits */
+        jnc     L_more_than_31
+
+/* less than 32 bits */
+        shrd    %cl,%ebx,%edx
+        shrd    %cl,%eax,%ebx
+        shr     %cl,%eax
+        jmp     L_shift_done
+
+L_more_than_31:
+        cmpw    $64,%cx
+        jnc     L_more_than_63
+
+        subb    $32,%cl
+        jz      L_exactly_32
+
+        shrd    %cl,%eax,%edx
+        shr     %cl,%eax
+        orl     %ebx,%ebx
+        jz      L_more_31_no_low        /* none of the lowest bits is set */
+
+        orl     $1,%edx                 /* record the fact in the extension */
+
+L_more_31_no_low:
+        movl    %eax,%ebx
+        xorl    %eax,%eax
+        jmp     L_shift_done
+
+L_exactly_32:
+        movl    %ebx,%edx
+        movl    %eax,%ebx
+        xorl    %eax,%eax
+        jmp     L_shift_done
+
+L_more_than_63:
+        cmpw    $65,%cx
+        jnc     L_more_than_64
+
+        /* Shift right by 64 bits */
+        movl    %eax,%edx
+        orl     %ebx,%ebx
+        jz      L_more_63_no_low
+
+        orl     $1,%edx
+        jmp     L_more_63_no_low
+
+L_more_than_64:
+        jne     L_more_than_65
+
+        /* Shift right by 65 bits */
+        /* Carry is clear if we get here */
+        movl    %eax,%edx
+        rcrl    %edx
+        jnc     L_shift_65_nc
+
+        orl     $1,%edx
+        jmp     L_more_63_no_low
+
+L_shift_65_nc:
+        orl     %ebx,%ebx
+        jz      L_more_63_no_low
+
+        orl     $1,%edx
+        jmp     L_more_63_no_low
+
+L_more_than_65:
+        movl    $1,%edx         /* The shifted nr always at least one '1' */
+
+L_more_63_no_low:
+        xorl    %ebx,%ebx
+        xorl    %eax,%eax
+
+L_shift_done:
+L_subtr:
+/*------------------------------+
+ |      Do the subtraction      |
+ +------------------------------*/
+        xorl    %ecx,%ecx
+        subl    %edx,%ecx
+        movl    %ecx,%edx
+        movl    SIGL(%esi),%ecx
+        sbbl    %ebx,%ecx
+        movl    %ecx,%ebx
+        movl    SIGH(%esi),%ecx
+        sbbl    %eax,%ecx
+        movl    %ecx,%eax
+
+#ifdef PARANOID
+        /* We can never get a borrow */
+        jc      L_bugged
+#endif /* PARANOID */
+
+/*--------------------------------------+
+ |      Normalize the result            |
+ +--------------------------------------*/
+        testl   $0x80000000,%eax
+        jnz     L_round         /* no shifting needed */
+
+        orl     %eax,%eax
+        jnz     L_shift_1       /* shift left 1 - 31 bits */
+
+        orl     %ebx,%ebx
+        jnz     L_shift_32      /* shift left 32 - 63 bits */
+
+/*
+ *       A rare case, the only one which is non-zero if we got here
+ *         is:           1000000 .... 0000
+ *                      -0111111 .... 1111 1
+ *                       -------------------- 
+ *                       0000000 .... 0000 1 
+ */
+
+        cmpl    $0x80000000,%edx
+        jnz     L_must_be_zero
+
+        /* Shift left 64 bits */
+        subw    $64,EXP(%edi)
+        xchg    %edx,%eax
+        jmp     fpu_reg_round
+
+L_must_be_zero:
+#ifdef PARANOID
+        orl     %edx,%edx
+        jnz     L_bugged_3
+#endif /* PARANOID */ 
+
+        /* The result is zero */
+        movw    $0,EXP(%edi)            /* exponent */
+        movl    $0,SIGL(%edi)
+        movl    $0,SIGH(%edi)
+        movl    TAG_Zero,%eax
+        jmp     L_exit
+
+L_shift_32:
+        movl    %ebx,%eax
+        movl    %edx,%ebx
+        movl    $0,%edx
+        subw    $32,EXP(%edi)   /* Can get underflow here */
+
+/* We need to shift left by 1 - 31 bits */
+L_shift_1:
+        bsrl    %eax,%ecx       /* get the required shift in %ecx */
+        subl    $31,%ecx
+        negl    %ecx
+        shld    %cl,%ebx,%eax
+        shld    %cl,%edx,%ebx
+        shl     %cl,%edx
+        subw    %cx,EXP(%edi)   /* Can get underflow here */
+
+L_round:
+        jmp     fpu_reg_round   /* Round the result */
+
+
+#ifdef PARANOID
+L_bugged_1:
+        pushl   EX_INTERNAL|0x206
+        call    EXCEPTION
+        pop     %ebx
+        jmp     L_error_exit
+
+L_bugged_2:
+        pushl   EX_INTERNAL|0x209
+        call    EXCEPTION
+        pop     %ebx
+        jmp     L_error_exit
+
+L_bugged_3:
+        pushl   EX_INTERNAL|0x210
+        call    EXCEPTION
+        pop     %ebx
+        jmp     L_error_exit
+
+L_bugged_4:
+        pushl   EX_INTERNAL|0x211
+        call    EXCEPTION
+        pop     %ebx
+        jmp     L_error_exit
+
+L_bugged:
+        pushl   EX_INTERNAL|0x212
+        call    EXCEPTION
+        pop     %ebx
+        jmp     L_error_exit
+
+L_error_exit:
+        movl    $-1,%eax
+
+#endif /* PARANOID */
+
+L_exit:
+        popl    %ebx
+        popl    %edi
+        popl    %esi
+        leave
+        ret
diff --git a/arch/i386/math-emu/round_Xsig.S b/arch/i386/math-emu/round_Xsig.S
new file mode 100644
index 000000000000..bbe0e87718e4
--- /dev/null
+++ b/arch/i386/math-emu/round_Xsig.S
@@ -0,0 +1,141 @@
+/*---------------------------------------------------------------------------+
+ |  round_Xsig.S                                                             |
+ |                                                                           |
+ | Copyright (C) 1992,1993,1994,1995                                         |
+ |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
+ |                       Australia.  E-mail billm@jacobi.maths.monash.edu.au |
+ |                                                                           |
+ | Normalize and round a 12 byte quantity.                                   |
+ | Call from C as:                                                           |
+ |   int round_Xsig(Xsig *n)                                                 |
+ |                                                                           |
+ | Normalize a 12 byte quantity.                                             |
+ | Call from C as:                                                           |
+ |   int norm_Xsig(Xsig *n)                                                  |
+ |                                                                           |
+ | Each function returns the size of the shift (nr of bits).                 |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+        .file   "round_Xsig.S"
+
+#include "fpu_emu.h"
+
+
+.text
+ENTRY(round_Xsig)
+        pushl   %ebp
+        movl    %esp,%ebp
+        pushl   %ebx            /* Reserve some space */
+        pushl   %ebx
+        pushl   %esi
+
+        movl    PARAM1,%esi
+
+        movl    8(%esi),%edx
+        movl    4(%esi),%ebx
+        movl    (%esi),%eax
+
+        movl    $0,-4(%ebp)
+
+        orl     %edx,%edx       /* ms bits */
+        js      L_round         /* Already normalized */
+        jnz     L_shift_1       /* Shift left 1 - 31 bits */
+
+        movl    %ebx,%edx
+        movl    %eax,%ebx
+        xorl    %eax,%eax
+        movl    $-32,-4(%ebp)
+
+/* We need to shift left by 1 - 31 bits */
+L_shift_1:
+        bsrl    %edx,%ecx       /* get the required shift in %ecx */
+        subl    $31,%ecx
+        negl    %ecx
+        subl    %ecx,-4(%ebp)
+        shld    %cl,%ebx,%edx
+        shld    %cl,%eax,%ebx
+        shl     %cl,%eax
+
+L_round:
+        testl   $0x80000000,%eax
+        jz      L_exit
+
+        addl    $1,%ebx
+        adcl    $0,%edx
+        jnz     L_exit
+
+        movl    $0x80000000,%edx
+        incl    -4(%ebp)
+
+L_exit:
+        movl    %edx,8(%esi)
+        movl    %ebx,4(%esi)
+        movl    %eax,(%esi)
+
+        movl    -4(%ebp),%eax
+
+        popl    %esi
+        popl    %ebx
+        leave
+        ret
+
+
+
+
+ENTRY(norm_Xsig)
+        pushl   %ebp
+        movl    %esp,%ebp
+        pushl   %ebx            /* Reserve some space */
+        pushl   %ebx
+        pushl   %esi
+
+        movl    PARAM1,%esi
+
+        movl    8(%esi),%edx
+        movl    4(%esi),%ebx
+        movl    (%esi),%eax
+
+        movl    $0,-4(%ebp)
+
+        orl     %edx,%edx       /* ms bits */
+        js      L_n_exit                /* Already normalized */
+        jnz     L_n_shift_1     /* Shift left 1 - 31 bits */
+
+        movl    %ebx,%edx
+        movl    %eax,%ebx
+        xorl    %eax,%eax
+        movl    $-32,-4(%ebp)
+
+        orl     %edx,%edx       /* ms bits */
+        js      L_n_exit        /* Normalized now */
+        jnz     L_n_shift_1     /* Shift left 1 - 31 bits */
+
+        movl    %ebx,%edx
+        movl    %eax,%ebx
+        xorl    %eax,%eax
+        addl    $-32,-4(%ebp)
+        jmp     L_n_exit        /* Might not be normalized,
+                                   but shift no more. */
+
+/* We need to shift left by 1 - 31 bits */
+L_n_shift_1:
+        bsrl    %edx,%ecx       /* get the required shift in %ecx */
+        subl    $31,%ecx
+        negl    %ecx
+        subl    %ecx,-4(%ebp)
+        shld    %cl,%ebx,%edx
+        shld    %cl,%eax,%ebx
+        shl     %cl,%eax
+
+L_n_exit:
+        movl    %edx,8(%esi)
+        movl    %ebx,4(%esi)
+        movl    %eax,(%esi)
+
+        movl    -4(%ebp),%eax
+
+        popl    %esi
+        popl    %ebx
+        leave
+        ret
+
diff --git a/arch/i386/math-emu/shr_Xsig.S b/arch/i386/math-emu/shr_Xsig.S
new file mode 100644
index 000000000000..31cdd118e918
--- /dev/null
+++ b/arch/i386/math-emu/shr_Xsig.S
@@ -0,0 +1,87 @@
+        .file   "shr_Xsig.S"
+/*---------------------------------------------------------------------------+
+ |  shr_Xsig.S                                                               |
+ |                                                                           |
+ | 12 byte right shift function                                              |
+ |                                                                           |
+ | Copyright (C) 1992,1994,1995                                              |
+ |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
+ |                       Australia.  E-mail billm@jacobi.maths.monash.edu.au |
+ |                                                                           |
+ | Call from C as:                                                           |
+ |   void shr_Xsig(Xsig *arg, unsigned nr)                                   |
+ |                                                                           |
+ |   Extended shift right function.                                          |
+ |   Fastest for small shifts.                                               |
+ |   Shifts the 12 byte quantity pointed to by the first arg (arg)           |
+ |   right by the number of bits specified by the second arg (nr).           |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+#include "fpu_emu.h"
+
+.text
+ENTRY(shr_Xsig)
+        push    %ebp
+        movl    %esp,%ebp
+        pushl   %esi
+        movl    PARAM2,%ecx
+        movl    PARAM1,%esi
+        cmpl    $32,%ecx        /* shrd only works for 0..31 bits */
+        jnc     L_more_than_31
+
+/* less than 32 bits */
+        pushl   %ebx
+        movl    (%esi),%eax     /* lsl */
+        movl    4(%esi),%ebx    /* midl */
+        movl    8(%esi),%edx    /* msl */
+        shrd    %cl,%ebx,%eax
+        shrd    %cl,%edx,%ebx
+        shr     %cl,%edx
+        movl    %eax,(%esi)
+        movl    %ebx,4(%esi)
+        movl    %edx,8(%esi)
+        popl    %ebx
+        popl    %esi
+        leave
+        ret
+
+L_more_than_31:
+        cmpl    $64,%ecx
+        jnc     L_more_than_63
+
+        subb    $32,%cl
+        movl    4(%esi),%eax    /* midl */
+        movl    8(%esi),%edx    /* msl */
+        shrd    %cl,%edx,%eax
+        shr     %cl,%edx
+        movl    %eax,(%esi)
+        movl    %edx,4(%esi)
+        movl    $0,8(%esi)
+        popl    %esi
+        leave
+        ret
+
+L_more_than_63:
+        cmpl    $96,%ecx
+        jnc     L_more_than_95
+
+        subb    $64,%cl
+        movl    8(%esi),%eax    /* msl */
+        shr     %cl,%eax
+        xorl    %edx,%edx
+        movl    %eax,(%esi)
+        movl    %edx,4(%esi)
+        movl    %edx,8(%esi)
+        popl    %esi
+        leave
+        ret
+
+L_more_than_95:
+        xorl    %eax,%eax
+        movl    %eax,(%esi)
+        movl    %eax,4(%esi)
+        movl    %eax,8(%esi)
+        popl    %esi
+        leave
+        ret
diff --git a/arch/i386/math-emu/status_w.h b/arch/i386/math-emu/status_w.h
new file mode 100644
index 000000000000..78d7b7689dd6
--- /dev/null
+++ b/arch/i386/math-emu/status_w.h
@@ -0,0 +1,65 @@
+/*---------------------------------------------------------------------------+
+ |  status_w.h                                                               |
+ |                                                                           |
+ | Copyright (C) 1992,1993                                                   |
+ |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
+ |                       Australia.  E-mail   billm@vaxc.cc.monash.edu.au    |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+#ifndef _STATUS_H_
+#define _STATUS_H_
+
+#include "fpu_emu.h"    /* for definition of PECULIAR_486 */
+
+#ifdef __ASSEMBLY__
+#define Const__(x)      $##x
+#else
+#define Const__(x)      x
+#endif
+
+#define SW_Backward     Const__(0x8000) /* backward compatibility */
+#define SW_C3           Const__(0x4000) /* condition bit 3 */
+#define SW_Top          Const__(0x3800) /* top of stack */
+#define SW_Top_Shift    Const__(11)     /* shift for top of stack bits */
+#define SW_C2           Const__(0x0400) /* condition bit 2 */
+#define SW_C1           Const__(0x0200) /* condition bit 1 */
+#define SW_C0           Const__(0x0100) /* condition bit 0 */
+#define SW_Summary      Const__(0x0080) /* exception summary */
+#define SW_Stack_Fault  Const__(0x0040) /* stack fault */
+#define SW_Precision    Const__(0x0020) /* loss of precision */
+#define SW_Underflow    Const__(0x0010) /* underflow */
+#define SW_Overflow     Const__(0x0008) /* overflow */
+#define SW_Zero_Div     Const__(0x0004) /* divide by zero */
+#define SW_Denorm_Op    Const__(0x0002) /* denormalized operand */
+#define SW_Invalid      Const__(0x0001) /* invalid operation */
+
+#define SW_Exc_Mask     Const__(0x27f)  /* Status word exception bit mask */
+
+#ifndef __ASSEMBLY__
+
+#define COMP_A_gt_B     1
+#define COMP_A_eq_B     2
+#define COMP_A_lt_B     3
+#define COMP_No_Comp    4
+#define COMP_Denormal   0x20
+#define COMP_NaN        0x40
+#define COMP_SNaN       0x80
+
+#define status_word() \
+  ((partial_status & ~SW_Top & 0xffff) | ((top << SW_Top_Shift) & SW_Top))
+#define setcc(cc) ({ \
+  partial_status &= ~(SW_C0|SW_C1|SW_C2|SW_C3); \
+  partial_status |= (cc) & (SW_C0|SW_C1|SW_C2|SW_C3); })
+
+#ifdef PECULIAR_486
+   /* Default, this conveys no information, but an 80486 does it. */
+   /* Clear the SW_C1 bit, "other bits undefined". */
+#  define clear_C1()  { partial_status &= ~SW_C1; }
+# else
+#  define clear_C1()
+#endif /* PECULIAR_486 */
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* _STATUS_H_ */
diff --git a/arch/i386/math-emu/version.h b/arch/i386/math-emu/version.h
new file mode 100644
index 000000000000..a0d73a1d2b67
--- /dev/null
+++ b/arch/i386/math-emu/version.h
@@ -0,0 +1,12 @@
+/*---------------------------------------------------------------------------+
+ |  version.h                                                                |
+ |                                                                           |
+ |                                                                           |
+ | Copyright (C) 1992,1993,1994,1996,1997,1999                               |
+ |                  W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia |
+ |                  E-mail   billm@melbpc.org.au                             |
+ |                                                                           |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+#define FPU_VERSION "wm-FPU-emu version 2.01"
diff --git a/arch/i386/math-emu/wm_shrx.S b/arch/i386/math-emu/wm_shrx.S
new file mode 100644
index 000000000000..518428317985
--- /dev/null
+++ b/arch/i386/math-emu/wm_shrx.S
@@ -0,0 +1,204 @@
+        .file   "wm_shrx.S"
+/*---------------------------------------------------------------------------+
+ |  wm_shrx.S                                                                |
+ |                                                                           |
+ | 64 bit right shift functions                                              |
+ |                                                                           |
+ | Copyright (C) 1992,1995                                                   |
+ |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
+ |                       Australia.  E-mail billm@jacobi.maths.monash.edu.au |
+ |                                                                           |
+ | Call from C as:                                                           |
+ |   unsigned FPU_shrx(void *arg1, unsigned arg2)                            |
+ | and                                                                       |
+ |   unsigned FPU_shrxs(void *arg1, unsigned arg2)                           |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+#include "fpu_emu.h"
+
+.text
+/*---------------------------------------------------------------------------+
+ |   unsigned FPU_shrx(void *arg1, unsigned arg2)                            |
+ |                                                                           |
+ |   Extended shift right function.                                          |
+ |   Fastest for small shifts.                                               |
+ |   Shifts the 64 bit quantity pointed to by the first arg (arg1)           |
+ |   right by the number of bits specified by the second arg (arg2).         |
+ |   Forms a 96 bit quantity from the 64 bit arg and eax:                    |
+ |                [  64 bit arg ][ eax ]                                     |
+ |            shift right  --------->                                        |
+ |   The eax register is initialized to 0 before the shifting.               |
+ |   Results returned in the 64 bit arg and eax.                             |
+ +---------------------------------------------------------------------------*/
+
+ENTRY(FPU_shrx)
+        push    %ebp
+        movl    %esp,%ebp
+        pushl   %esi
+        movl    PARAM2,%ecx
+        movl    PARAM1,%esi
+        cmpl    $32,%ecx        /* shrd only works for 0..31 bits */
+        jnc     L_more_than_31
+
+/* less than 32 bits */
+        pushl   %ebx
+        movl    (%esi),%ebx     /* lsl */
+        movl    4(%esi),%edx    /* msl */
+        xorl    %eax,%eax       /* extension */
+        shrd    %cl,%ebx,%eax
+        shrd    %cl,%edx,%ebx
+        shr     %cl,%edx
+        movl    %ebx,(%esi)
+        movl    %edx,4(%esi)
+        popl    %ebx
+        popl    %esi
+        leave
+        ret
+
+L_more_than_31:
+        cmpl    $64,%ecx
+        jnc     L_more_than_63
+
+        subb    $32,%cl
+        movl    (%esi),%eax     /* lsl */
+        movl    4(%esi),%edx    /* msl */
+        shrd    %cl,%edx,%eax
+        shr     %cl,%edx
+        movl    %edx,(%esi)
+        movl    $0,4(%esi)
+        popl    %esi
+        leave
+        ret
+
+L_more_than_63:
+        cmpl    $96,%ecx
+        jnc     L_more_than_95
+
+        subb    $64,%cl
+        movl    4(%esi),%eax    /* msl */
+        shr     %cl,%eax
+        xorl    %edx,%edx
+        movl    %edx,(%esi)
+        movl    %edx,4(%esi)
+        popl    %esi
+        leave
+        ret
+
+L_more_than_95:
+        xorl    %eax,%eax
+        movl    %eax,(%esi)
+        movl    %eax,4(%esi)
+        popl    %esi
+        leave
+        ret
+
+
+/*---------------------------------------------------------------------------+
+ |   unsigned FPU_shrxs(void *arg1, unsigned arg2)                           |
+ |                                                                           |
+ |   Extended shift right function (optimized for small floating point       |
+ |   integers).                                                              |
+ |   Shifts the 64 bit quantity pointed to by the first arg (arg1)           |
+ |   right by the number of bits specified by the second arg (arg2).         |
+ |   Forms a 96 bit quantity from the 64 bit arg and eax:                    |
+ |                [  64 bit arg ][ eax ]                                     |
+ |            shift right  --------->                                        |
+ |   The eax register is initialized to 0 before the shifting.               |
+ |   The lower 8 bits of eax are lost and replaced by a flag which is        |
+ |   set (to 0x01) if any bit, apart from the first one, is set in the       |
+ |   part which has been shifted out of the arg.                             |
+ |   Results returned in the 64 bit arg and eax.                             |
+ +---------------------------------------------------------------------------*/
+ENTRY(FPU_shrxs)
+        push    %ebp
+        movl    %esp,%ebp
+        pushl   %esi
+        pushl   %ebx
+        movl    PARAM2,%ecx
+        movl    PARAM1,%esi
+        cmpl    $64,%ecx        /* shrd only works for 0..31 bits */
+        jnc     Ls_more_than_63
+
+        cmpl    $32,%ecx        /* shrd only works for 0..31 bits */
+        jc      Ls_less_than_32
+
+/* We got here without jumps by assuming that the most common requirement
+   is for small integers */
+/* Shift by [32..63] bits */
+        subb    $32,%cl
+        movl    (%esi),%eax     /* lsl */
+        movl    4(%esi),%edx    /* msl */
+        xorl    %ebx,%ebx
+        shrd    %cl,%eax,%ebx
+        shrd    %cl,%edx,%eax
+        shr     %cl,%edx
+        orl     %ebx,%ebx               /* test these 32 bits */
+        setne   %bl
+        test    $0x7fffffff,%eax        /* and 31 bits here */
+        setne   %bh
+        orw     %bx,%bx                 /* Any of the 63 bit set ? */
+        setne   %al
+        movl    %edx,(%esi)
+        movl    $0,4(%esi)
+        popl    %ebx
+        popl    %esi
+        leave
+        ret
+
+/* Shift by [0..31] bits */
+Ls_less_than_32:
+        movl    (%esi),%ebx     /* lsl */
+        movl    4(%esi),%edx    /* msl */
+        xorl    %eax,%eax       /* extension */
+        shrd    %cl,%ebx,%eax
+        shrd    %cl,%edx,%ebx
+        shr     %cl,%edx
+        test    $0x7fffffff,%eax        /* only need to look at eax here */
+        setne   %al
+        movl    %ebx,(%esi)
+        movl    %edx,4(%esi)
+        popl    %ebx
+        popl    %esi
+        leave
+        ret
+
+/* Shift by [64..95] bits */
+Ls_more_than_63:
+        cmpl    $96,%ecx
+        jnc     Ls_more_than_95
+
+        subb    $64,%cl
+        movl    (%esi),%ebx     /* lsl */
+        movl    4(%esi),%eax    /* msl */
+        xorl    %edx,%edx       /* extension */
+        shrd    %cl,%ebx,%edx
+        shrd    %cl,%eax,%ebx
+        shr     %cl,%eax
+        orl     %ebx,%edx
+        setne   %bl
+        test    $0x7fffffff,%eax        /* only need to look at eax here */
+        setne   %bh
+        orw     %bx,%bx
+        setne   %al
+        xorl    %edx,%edx
+        movl    %edx,(%esi)     /* set to zero */
+        movl    %edx,4(%esi)    /* set to zero */
+        popl    %ebx
+        popl    %esi
+        leave
+        ret
+
+Ls_more_than_95:
+/* Shift by [96..inf) bits */
+        xorl    %eax,%eax
+        movl    (%esi),%ebx
+        orl     4(%esi),%ebx
+        setne   %al
+        xorl    %ebx,%ebx
+        movl    %ebx,(%esi)
+        movl    %ebx,4(%esi)
+        popl    %ebx
+        popl    %esi
+        leave
+        ret
diff --git a/arch/i386/math-emu/wm_sqrt.S b/arch/i386/math-emu/wm_sqrt.S
new file mode 100644
index 000000000000..d258f59564e1
--- /dev/null
+++ b/arch/i386/math-emu/wm_sqrt.S
@@ -0,0 +1,470 @@
+        .file   "wm_sqrt.S"
+/*---------------------------------------------------------------------------+
+ |  wm_sqrt.S                                                                |
+ |                                                                           |
+ | Fixed point arithmetic square root evaluation.                            |
+ |                                                                           |
+ | Copyright (C) 1992,1993,1995,1997                                         |
+ |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
+ |                       Australia.  E-mail billm@suburbia.net               |
+ |                                                                           |
+ | Call from C as:                                                           |
+ |    int wm_sqrt(FPU_REG *n, unsigned int control_word)                     |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+/*---------------------------------------------------------------------------+
+ |  wm_sqrt(FPU_REG *n, unsigned int control_word)                           |
+ |    returns the square root of n in n.                                     |
+ |                                                                           |
+ |  Use Newton's method to compute the square root of a number, which must   |
+ |  be in the range  [1.0 .. 4.0),  to 64 bits accuracy.                     |
+ |  Does not check the sign or tag of the argument.                          |
+ |  Sets the exponent, but not the sign or tag of the result.                |
+ |                                                                           |
+ |  The guess is kept in %esi:%edi                                           |
+ +---------------------------------------------------------------------------*/
+
+#include "exception.h"
+#include "fpu_emu.h"
+
+
+#ifndef NON_REENTRANT_FPU
+/*      Local storage on the stack: */
+#define FPU_accum_3     -4(%ebp)        /* ms word */
+#define FPU_accum_2     -8(%ebp)
+#define FPU_accum_1     -12(%ebp)
+#define FPU_accum_0     -16(%ebp)
+
+/*
+ * The de-normalised argument:
+ *                  sq_2                  sq_1              sq_0
+ *        b b b b b b b ... b b b   b b b .... b b b   b 0 0 0 ... 0
+ *           ^ binary point here
+ */
+#define FPU_fsqrt_arg_2 -20(%ebp)       /* ms word */
+#define FPU_fsqrt_arg_1 -24(%ebp)
+#define FPU_fsqrt_arg_0 -28(%ebp)       /* ls word, at most the ms bit is set */
+
+#else
+/*      Local storage in a static area: */
+.data
+        .align 4,0
+FPU_accum_3:
+        .long   0               /* ms word */
+FPU_accum_2:
+        .long   0
+FPU_accum_1:
+        .long   0
+FPU_accum_0:
+        .long   0
+
+/* The de-normalised argument:
+                    sq_2                  sq_1              sq_0
+          b b b b b b b ... b b b   b b b .... b b b   b 0 0 0 ... 0
+             ^ binary point here
+ */
+FPU_fsqrt_arg_2:
+        .long   0               /* ms word */
+FPU_fsqrt_arg_1:
+        .long   0
+FPU_fsqrt_arg_0:
+        .long   0               /* ls word, at most the ms bit is set */
+#endif /* NON_REENTRANT_FPU */ 
+
+
+.text
+ENTRY(wm_sqrt)
+        pushl   %ebp
+        movl    %esp,%ebp
+#ifndef NON_REENTRANT_FPU
+        subl    $28,%esp
+#endif /* NON_REENTRANT_FPU */
+        pushl   %esi
+        pushl   %edi
+        pushl   %ebx
+
+        movl    PARAM1,%esi
+
+        movl    SIGH(%esi),%eax
+        movl    SIGL(%esi),%ecx
+        xorl    %edx,%edx
+
+/* We use a rough linear estimate for the first guess.. */
+
+        cmpw    EXP_BIAS,EXP(%esi)
+        jnz     sqrt_arg_ge_2
+
+        shrl    $1,%eax                 /* arg is in the range  [1.0 .. 2.0) */
+        rcrl    $1,%ecx
+        rcrl    $1,%edx
+
+sqrt_arg_ge_2:
+/* From here on, n is never accessed directly again until it is
+   replaced by the answer. */
+
+        movl    %eax,FPU_fsqrt_arg_2            /* ms word of n */
+        movl    %ecx,FPU_fsqrt_arg_1
+        movl    %edx,FPU_fsqrt_arg_0
+
+/* Make a linear first estimate */
+        shrl    $1,%eax
+        addl    $0x40000000,%eax
+        movl    $0xaaaaaaaa,%ecx
+        mull    %ecx
+        shll    %edx                    /* max result was 7fff... */
+        testl   $0x80000000,%edx        /* but min was 3fff... */
+        jnz     sqrt_prelim_no_adjust
+
+        movl    $0x80000000,%edx        /* round up */
+
+sqrt_prelim_no_adjust:
+        movl    %edx,%esi       /* Our first guess */
+
+/* We have now computed (approx)   (2 + x) / 3, which forms the basis
+   for a few iterations of Newton's method */
+
+        movl    FPU_fsqrt_arg_2,%ecx    /* ms word */
+
+/*
+ * From our initial estimate, three iterations are enough to get us
+ * to 30 bits or so. This will then allow two iterations at better
+ * precision to complete the process.
+ */
+
+/* Compute  (g + n/g)/2  at each iteration (g is the guess). */
+        shrl    %ecx            /* Doing this first will prevent a divide */
+                                /* overflow later. */
+
+        movl    %ecx,%edx       /* msw of the arg / 2 */
+        divl    %esi            /* current estimate */
+        shrl    %esi            /* divide by 2 */
+        addl    %eax,%esi       /* the new estimate */
+
+        movl    %ecx,%edx
+        divl    %esi
+        shrl    %esi
+        addl    %eax,%esi
+
+        movl    %ecx,%edx
+        divl    %esi
+        shrl    %esi
+        addl    %eax,%esi
+
+/*
+ * Now that an estimate accurate to about 30 bits has been obtained (in %esi),
+ * we improve it to 60 bits or so.
+ *
+ * The strategy from now on is to compute new estimates from
+ *      guess := guess + (n - guess^2) / (2 * guess)
+ */
+
+/* First, find the square of the guess */
+        movl    %esi,%eax
+        mull    %esi
+/* guess^2 now in %edx:%eax */
+
+        movl    FPU_fsqrt_arg_1,%ecx
+        subl    %ecx,%eax
+        movl    FPU_fsqrt_arg_2,%ecx    /* ms word of normalized n */
+        sbbl    %ecx,%edx
+        jnc     sqrt_stage_2_positive
+
+/* Subtraction gives a negative result,
+   negate the result before division. */
+        notl    %edx
+        notl    %eax
+        addl    $1,%eax
+        adcl    $0,%edx
+
+        divl    %esi
+        movl    %eax,%ecx
+
+        movl    %edx,%eax
+        divl    %esi
+        jmp     sqrt_stage_2_finish
+
+sqrt_stage_2_positive:
+        divl    %esi
+        movl    %eax,%ecx
+
+        movl    %edx,%eax
+        divl    %esi
+
+        notl    %ecx
+        notl    %eax
+        addl    $1,%eax
+        adcl    $0,%ecx
+
+sqrt_stage_2_finish:
+        sarl    $1,%ecx         /* divide by 2 */
+        rcrl    $1,%eax
+
+        /* Form the new estimate in %esi:%edi */
+        movl    %eax,%edi
+        addl    %ecx,%esi
+
+        jnz     sqrt_stage_2_done       /* result should be [1..2) */
+
+#ifdef PARANOID
+/* It should be possible to get here only if the arg is ffff....ffff */
+        cmp     $0xffffffff,FPU_fsqrt_arg_1
+        jnz     sqrt_stage_2_error
+#endif /* PARANOID */
+
+/* The best rounded result. */
+        xorl    %eax,%eax
+        decl    %eax
+        movl    %eax,%edi
+        movl    %eax,%esi
+        movl    $0x7fffffff,%eax
+        jmp     sqrt_round_result
+
+#ifdef PARANOID
+sqrt_stage_2_error:
+        pushl   EX_INTERNAL|0x213
+        call    EXCEPTION
+#endif /* PARANOID */ 
+
+sqrt_stage_2_done:
+
+/* Now the square root has been computed to better than 60 bits. */
+
+/* Find the square of the guess. */
+        movl    %edi,%eax               /* ls word of guess */
+        mull    %edi
+        movl    %edx,FPU_accum_1
+
+        movl    %esi,%eax
+        mull    %esi
+        movl    %edx,FPU_accum_3
+        movl    %eax,FPU_accum_2
+
+        movl    %edi,%eax
+        mull    %esi
+        addl    %eax,FPU_accum_1
+        adcl    %edx,FPU_accum_2
+        adcl    $0,FPU_accum_3
+
+/*      movl    %esi,%eax */
+/*      mull    %edi */
+        addl    %eax,FPU_accum_1
+        adcl    %edx,FPU_accum_2
+        adcl    $0,FPU_accum_3
+
+/* guess^2 now in FPU_accum_3:FPU_accum_2:FPU_accum_1 */
+
+        movl    FPU_fsqrt_arg_0,%eax            /* get normalized n */
+        subl    %eax,FPU_accum_1
+        movl    FPU_fsqrt_arg_1,%eax
+        sbbl    %eax,FPU_accum_2
+        movl    FPU_fsqrt_arg_2,%eax            /* ms word of normalized n */
+        sbbl    %eax,FPU_accum_3
+        jnc     sqrt_stage_3_positive
+
+/* Subtraction gives a negative result,
+   negate the result before division */
+        notl    FPU_accum_1
+        notl    FPU_accum_2
+        notl    FPU_accum_3
+        addl    $1,FPU_accum_1
+        adcl    $0,FPU_accum_2
+
+#ifdef PARANOID
+        adcl    $0,FPU_accum_3  /* This must be zero */
+        jz      sqrt_stage_3_no_error
+
+sqrt_stage_3_error:
+        pushl   EX_INTERNAL|0x207
+        call    EXCEPTION
+
+sqrt_stage_3_no_error:
+#endif /* PARANOID */
+
+        movl    FPU_accum_2,%edx
+        movl    FPU_accum_1,%eax
+        divl    %esi
+        movl    %eax,%ecx
+
+        movl    %edx,%eax
+        divl    %esi
+
+        sarl    $1,%ecx         /* divide by 2 */
+        rcrl    $1,%eax
+
+        /* prepare to round the result */
+
+        addl    %ecx,%edi
+        adcl    $0,%esi
+
+        jmp     sqrt_stage_3_finished
+
+sqrt_stage_3_positive:
+        movl    FPU_accum_2,%edx
+        movl    FPU_accum_1,%eax
+        divl    %esi
+        movl    %eax,%ecx
+
+        movl    %edx,%eax
+        divl    %esi
+
+        sarl    $1,%ecx         /* divide by 2 */
+        rcrl    $1,%eax
+
+        /* prepare to round the result */
+
+        notl    %eax            /* Negate the correction term */
+        notl    %ecx
+        addl    $1,%eax
+        adcl    $0,%ecx         /* carry here ==> correction == 0 */
+        adcl    $0xffffffff,%esi
+
+        addl    %ecx,%edi
+        adcl    $0,%esi
+
+sqrt_stage_3_finished:
+
+/*
+ * The result in %esi:%edi:%esi should be good to about 90 bits here,
+ * and the rounding information here does not have sufficient accuracy
+ * in a few rare cases.
+ */
+        cmpl    $0xffffffe0,%eax
+        ja      sqrt_near_exact_x
+
+        cmpl    $0x00000020,%eax
+        jb      sqrt_near_exact
+
+        cmpl    $0x7fffffe0,%eax
+        jb      sqrt_round_result
+
+        cmpl    $0x80000020,%eax
+        jb      sqrt_get_more_precision
+
+sqrt_round_result:
+/* Set up for rounding operations */
+        movl    %eax,%edx
+        movl    %esi,%eax
+        movl    %edi,%ebx
+        movl    PARAM1,%edi
+        movw    EXP_BIAS,EXP(%edi)      /* Result is in  [1.0 .. 2.0) */
+        jmp     fpu_reg_round
+
+
+sqrt_near_exact_x:
+/* First, the estimate must be rounded up. */
+        addl    $1,%edi
+        adcl    $0,%esi
+
+sqrt_near_exact:
+/*
+ * This is an easy case because x^1/2 is monotonic.
+ * We need just find the square of our estimate, compare it
+ * with the argument, and deduce whether our estimate is
+ * above, below, or exact. We use the fact that the estimate
+ * is known to be accurate to about 90 bits.
+ */
+        movl    %edi,%eax               /* ls word of guess */
+        mull    %edi
+        movl    %edx,%ebx               /* 2nd ls word of square */
+        movl    %eax,%ecx               /* ls word of square */
+
+        movl    %edi,%eax
+        mull    %esi
+        addl    %eax,%ebx
+        addl    %eax,%ebx
+
+#ifdef PARANOID
+        cmp     $0xffffffb0,%ebx
+        jb      sqrt_near_exact_ok
+
+        cmp     $0x00000050,%ebx
+        ja      sqrt_near_exact_ok
+
+        pushl   EX_INTERNAL|0x214
+        call    EXCEPTION
+
+sqrt_near_exact_ok:
+#endif /* PARANOID */ 
+
+        or      %ebx,%ebx
+        js      sqrt_near_exact_small
+
+        jnz     sqrt_near_exact_large
+
+        or      %ebx,%edx
+        jnz     sqrt_near_exact_large
+
+/* Our estimate is exactly the right answer */
+        xorl    %eax,%eax
+        jmp     sqrt_round_result
+
+sqrt_near_exact_small:
+/* Our estimate is too small */
+        movl    $0x000000ff,%eax
+        jmp     sqrt_round_result
+        
+sqrt_near_exact_large:
+/* Our estimate is too large, we need to decrement it */
+        subl    $1,%edi
+        sbbl    $0,%esi
+        movl    $0xffffff00,%eax
+        jmp     sqrt_round_result
+
+
+sqrt_get_more_precision:
+/* This case is almost the same as the above, except we start
+   with an extra bit of precision in the estimate. */
+        stc                     /* The extra bit. */
+        rcll    $1,%edi         /* Shift the estimate left one bit */
+        rcll    $1,%esi
+
+        movl    %edi,%eax               /* ls word of guess */
+        mull    %edi
+        movl    %edx,%ebx               /* 2nd ls word of square */
+        movl    %eax,%ecx               /* ls word of square */
+
+        movl    %edi,%eax
+        mull    %esi
+        addl    %eax,%ebx
+        addl    %eax,%ebx
+
+/* Put our estimate back to its original value */
+        stc                     /* The ms bit. */
+        rcrl    $1,%esi         /* Shift the estimate left one bit */
+        rcrl    $1,%edi
+
+#ifdef PARANOID
+        cmp     $0xffffff60,%ebx
+        jb      sqrt_more_prec_ok
+
+        cmp     $0x000000a0,%ebx
+        ja      sqrt_more_prec_ok
+
+        pushl   EX_INTERNAL|0x215
+        call    EXCEPTION
+
+sqrt_more_prec_ok:
+#endif /* PARANOID */ 
+
+        or      %ebx,%ebx
+        js      sqrt_more_prec_small
+
+        jnz     sqrt_more_prec_large
+
+        or      %ebx,%ecx
+        jnz     sqrt_more_prec_large
+
+/* Our estimate is exactly the right answer */
+        movl    $0x80000000,%eax
+        jmp     sqrt_round_result
+
+sqrt_more_prec_small:
+/* Our estimate is too small */
+        movl    $0x800000ff,%eax
+        jmp     sqrt_round_result
+        
+sqrt_more_prec_large:
+/* Our estimate is too large */
+        movl    $0x7fffff00,%eax
+        jmp     sqrt_round_result