1 files changed, 104 insertions, 0 deletions

diff --git a/arch/m68k/fpsp040/x_fline.S b/arch/m68k/fpsp040/x_fline.S
new file mode 100644
index 000000000000..3917710b0fde
--- /dev/null
+++ b/arch/m68k/fpsp040/x_fline.S
@@ -0,0 +1,104 @@
+|
+|       x_fline.sa 3.3 1/10/91
+|
+|       fpsp_fline --- FPSP handler for fline exception
+|
+|       First determine if the exception is one of the unimplemented
+|       floating point instructions.  If so, let fpsp_unimp handle it.
+|       Next, determine if the instruction is an fmovecr with a non-zero
+|       <ea> field.  If so, handle here and return.  Otherwise, it
+|       must be a real F-line exception.
+|
+
+|               Copyright (C) Motorola, Inc. 1990
+|                       All Rights Reserved
+|
+|       THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA
+|       The copyright notice above does not evidence any
+|       actual or intended publication of such source code.
+
+X_FLINE:        |idnt    2,1 | Motorola 040 Floating Point Software Package
+
+        |section        8
+
+#include "fpsp.h"
+
+        |xref   real_fline
+        |xref   fpsp_unimp
+        |xref   uni_2
+        |xref   mem_read
+        |xref   fpsp_fmt_error
+
+        .global fpsp_fline
+fpsp_fline:
+|
+|       check for unimplemented vector first.  Use EXC_VEC-4 because
+|       the equate is valid only after a 'link a6' has pushed one more
+|       long onto the stack.
+|
+        cmpw    #UNIMP_VEC,EXC_VEC-4(%a7)
+        beql    fpsp_unimp
+
+|
+|       fmovecr with non-zero <ea> handling here
+|
+        subl    #4,%a7          |4 accounts for 2-word difference
+|                               ;between six word frame (unimp) and
+|                               ;four word frame
+        link    %a6,#-LOCAL_SIZE
+        fsave   -(%a7)
+        moveml  %d0-%d1/%a0-%a1,USER_DA(%a6)
+        moveal  EXC_PC+4(%a6),%a0       |get address of fline instruction
+        leal    L_SCR1(%a6),%a1 |use L_SCR1 as scratch
+        movel   #4,%d0
+        addl    #4,%a6          |to offset the sub.l #4,a7 above so that
+|                               ;a6 can point correctly to the stack frame
+|                               ;before branching to mem_read
+        bsrl    mem_read
+        subl    #4,%a6
+        movel   L_SCR1(%a6),%d0 |d0 contains the fline and command word
+        bfextu  %d0{#4:#3},%d1  |extract coprocessor id
+        cmpib   #1,%d1          |check if cpid=1
+        bne     not_mvcr        |exit if not
+        bfextu  %d0{#16:#6},%d1
+        cmpib   #0x17,%d1               |check if it is an FMOVECR encoding
+        bne     not_mvcr
+|                               ;if an FMOVECR instruction, fix stack
+|                               ;and go to FPSP_UNIMP
+fix_stack:
+        cmpib   #VER_40,(%a7)   |test for orig unimp frame
+        bnes    ck_rev
+        subl    #UNIMP_40_SIZE-4,%a7 |emulate an orig fsave
+        moveb   #VER_40,(%a7)
+        moveb   #UNIMP_40_SIZE-4,1(%a7)
+        clrw    2(%a7)
+        bras    fix_con
+ck_rev:
+        cmpib   #VER_41,(%a7)   |test for rev unimp frame
+        bnel    fpsp_fmt_error  |if not $40 or $41, exit with error
+        subl    #UNIMP_41_SIZE-4,%a7 |emulate a rev fsave
+        moveb   #VER_41,(%a7)
+        moveb   #UNIMP_41_SIZE-4,1(%a7)
+        clrw    2(%a7)
+fix_con:
+        movew   EXC_SR+4(%a6),EXC_SR(%a6) |move stacked sr to new position
+        movel   EXC_PC+4(%a6),EXC_PC(%a6) |move stacked pc to new position
+        fmovel  EXC_PC(%a6),%FPIAR |point FPIAR to fline inst
+        movel   #4,%d1
+        addl    %d1,EXC_PC(%a6) |increment stacked pc value to next inst
+        movew   #0x202c,EXC_VEC(%a6) |reformat vector to unimp
+        clrl    EXC_EA(%a6)     |clear the EXC_EA field
+        movew   %d0,CMDREG1B(%a6) |move the lower word into CMDREG1B
+        clrl    E_BYTE(%a6)
+        bsetb   #UFLAG,T_BYTE(%a6)
+        moveml  USER_DA(%a6),%d0-%d1/%a0-%a1 |restore data registers
+        bral    uni_2
+
+not_mvcr:
+        moveml  USER_DA(%a6),%d0-%d1/%a0-%a1 |restore data registers
+        frestore (%a7)+
+        unlk    %a6
+        addl    #4,%a7
+        bral    real_fline
+
+        |end