Fix preemption and SMP problems in the FP emulator code.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 77 insertions, 98 deletions

diff --git a/arch/mips/math-emu/ieee754.h b/arch/mips/math-emu/ieee754.h
index b8772f46972d..5689b0cf0185 100644
--- a/arch/mips/math-emu/ieee754.h
+++ b/arch/mips/math-emu/ieee754.h
@@ -1,13 +1,8 @@
-/* single and double precision fp ops
- * missing extended precision.
-*/
 /*
  * MIPS floating point support
  * Copyright (C) 1994-2000 Algorithmics Ltd.
  * http://www.algor.co.uk
  *
- * ########################################################################
- *
  *  This program is free software; you can distribute it and/or modify it
  *  under the terms of the GNU General Public License (Version 2) as
  *  published by the Free Software Foundation.
@@ -21,20 +16,16 @@
  *  with this program; if not, write to the Free Software Foundation, Inc.,
  *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  *
- * ########################################################################
- */
-
-/**************************************************************************
  *  Nov 7, 2000
  *  Modification to allow integration with Linux kernel
  *
  *  Kevin D. Kissell, kevink@mips.com and Carsten Langgard, carstenl@mips.com
  *  Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
- *************************************************************************/
+ */
 
-#ifdef __KERNEL__
-/* Going from Algorithmics to Linux native environment, add this */
+#include <asm/byteorder.h>
 #include <linux/types.h>
+#include <linux/sched.h>
 
 /*
  * Not very pretty, but the Linux kernel's normal va_list definition
@@ -44,18 +35,7 @@
 #include <stdarg.h>
 #endif
 
-#else
-
-/* Note that __KERNEL__ is taken to mean Linux kernel */
-
-#if #system(OpenBSD)
-#include <machine/types.h>
-#endif
-#include <machine/endian.h>
-
-#endif                          /* __KERNEL__ */
-
-#if (defined(BYTE_ORDER) && BYTE_ORDER == LITTLE_ENDIAN) || defined(__MIPSEL__)
+#ifdef __LITTLE_ENDIAN
 struct ieee754dp_konst {
         unsigned mantlo:32;
         unsigned manthi:20;
@@ -86,13 +66,14 @@ typedef union _ieee754sp {
 } ieee754sp;
 #endif
 
-#if (defined(BYTE_ORDER) && BYTE_ORDER == BIG_ENDIAN) || defined(__MIPSEB__)
+#ifdef __BIG_ENDIAN
 struct ieee754dp_konst {
         unsigned sign:1;
         unsigned bexp:11;
         unsigned manthi:20;
         unsigned mantlo:32;
 };
+
 typedef union _ieee754dp {
         struct ieee754dp_konst oparts;
         struct {
@@ -251,93 +232,109 @@ extern const char *const ieee754_cname[];
 
 /* "normal" comparisons
 */
-static __inline int ieee754sp_eq(ieee754sp x, ieee754sp y)
+static inline int ieee754sp_eq(ieee754sp x, ieee754sp y)
 {
         return ieee754sp_cmp(x, y, IEEE754_CEQ, 0);
 }
 
-static __inline int ieee754sp_ne(ieee754sp x, ieee754sp y)
+static inline int ieee754sp_ne(ieee754sp x, ieee754sp y)
 {
         return ieee754sp_cmp(x, y,
                              IEEE754_CLT | IEEE754_CGT | IEEE754_CUN, 0);
 }
 
-static __inline int ieee754sp_lt(ieee754sp x, ieee754sp y)
+static inline int ieee754sp_lt(ieee754sp x, ieee754sp y)
 {
         return ieee754sp_cmp(x, y, IEEE754_CLT, 0);
 }
 
-static __inline int ieee754sp_le(ieee754sp x, ieee754sp y)
+static inline int ieee754sp_le(ieee754sp x, ieee754sp y)
 {
         return ieee754sp_cmp(x, y, IEEE754_CLT | IEEE754_CEQ, 0);
 }
 
-static __inline int ieee754sp_gt(ieee754sp x, ieee754sp y)
+static inline int ieee754sp_gt(ieee754sp x, ieee754sp y)
 {
         return ieee754sp_cmp(x, y, IEEE754_CGT, 0);
 }
 
 
-static __inline int ieee754sp_ge(ieee754sp x, ieee754sp y)
+static inline int ieee754sp_ge(ieee754sp x, ieee754sp y)
 {
         return ieee754sp_cmp(x, y, IEEE754_CGT | IEEE754_CEQ, 0);
 }
 
-static __inline int ieee754dp_eq(ieee754dp x, ieee754dp y)
+static inline int ieee754dp_eq(ieee754dp x, ieee754dp y)
 {
         return ieee754dp_cmp(x, y, IEEE754_CEQ, 0);
 }
 
-static __inline int ieee754dp_ne(ieee754dp x, ieee754dp y)
+static inline int ieee754dp_ne(ieee754dp x, ieee754dp y)
 {
         return ieee754dp_cmp(x, y,
                              IEEE754_CLT | IEEE754_CGT | IEEE754_CUN, 0);
 }
 
-static __inline int ieee754dp_lt(ieee754dp x, ieee754dp y)
+static inline int ieee754dp_lt(ieee754dp x, ieee754dp y)
 {
         return ieee754dp_cmp(x, y, IEEE754_CLT, 0);
 }
 
-static __inline int ieee754dp_le(ieee754dp x, ieee754dp y)
+static inline int ieee754dp_le(ieee754dp x, ieee754dp y)
 {
         return ieee754dp_cmp(x, y, IEEE754_CLT | IEEE754_CEQ, 0);
 }
 
-static __inline int ieee754dp_gt(ieee754dp x, ieee754dp y)
+static inline int ieee754dp_gt(ieee754dp x, ieee754dp y)
 {
         return ieee754dp_cmp(x, y, IEEE754_CGT, 0);
 }
 
-static __inline int ieee754dp_ge(ieee754dp x, ieee754dp y)
+static inline int ieee754dp_ge(ieee754dp x, ieee754dp y)
 {
         return ieee754dp_cmp(x, y, IEEE754_CGT | IEEE754_CEQ, 0);
 }
 
 
-/* like strtod
-*/
+/*
+ * Like strtod
+ */
 ieee754dp ieee754dp_fstr(const char *s, char **endp);
 char *ieee754dp_tstr(ieee754dp x, int prec, int fmt, int af);
 
 
-/* the control status register
-*/
-struct ieee754_csr {
-        unsigned pad:13;
+/*
+ * The control status register
+ */
+struct _ieee754_csr {
+#ifdef __BIG_ENDIAN
+        unsigned pad0:7;
         unsigned nod:1;         /* set 1 for no denormalised numbers */
-        unsigned cx:5;          /* exceptions this operation */
+        unsigned c:1;           /* condition */
+        unsigned pad1:5;
+        unsigned cx:6;          /* exceptions this operation */
         unsigned mx:5;          /* exception enable  mask */
         unsigned sx:5;          /* exceptions total */
         unsigned rm:2;          /* current rounding mode */
+#endif
+#ifdef __LITTLE_ENDIAN
+        unsigned rm:2;          /* current rounding mode */
+        unsigned sx:5;          /* exceptions total */
+        unsigned mx:5;          /* exception enable  mask */
+        unsigned cx:6;          /* exceptions this operation */
+        unsigned pad1:5;
+        unsigned c:1;           /* condition */
+        unsigned nod:1;         /* set 1 for no denormalised numbers */
+        unsigned pad0:7;
+#endif
 };
-extern struct ieee754_csr ieee754_csr;
+#define ieee754_csr (*(struct _ieee754_csr *)(&current->thread.fpu.soft.fcr31))
 
-static __inline unsigned ieee754_getrm(void)
+static inline unsigned ieee754_getrm(void)
 {
         return (ieee754_csr.rm);
 }
-static __inline unsigned ieee754_setrm(unsigned rm)
+static inline unsigned ieee754_setrm(unsigned rm)
 {
         return (ieee754_csr.rm = rm);
 }
@@ -345,14 +342,14 @@ static __inline unsigned ieee754_setrm(unsigned rm)
 /*
  * get current exceptions
  */
-static __inline unsigned ieee754_getcx(void)
+static inline unsigned ieee754_getcx(void)
 {
         return (ieee754_csr.cx);
 }
 
 /* test for current exception condition
  */
-static __inline int ieee754_cxtest(unsigned n)
+static inline int ieee754_cxtest(unsigned n)
 {
         return (ieee754_csr.cx & n);
 }
@@ -360,21 +357,21 @@ static __inline int ieee754_cxtest(unsigned n)
 /*
  * get sticky exceptions
  */
-static __inline unsigned ieee754_getsx(void)
+static inline unsigned ieee754_getsx(void)
 {
         return (ieee754_csr.sx);
 }
 
 /* clear sticky conditions
 */
-static __inline unsigned ieee754_clrsx(void)
+static inline unsigned ieee754_clrsx(void)
 {
         return (ieee754_csr.sx = 0);
 }
 
 /* test for sticky exception condition
  */
-static __inline int ieee754_sxtest(unsigned n)
+static inline int ieee754_sxtest(unsigned n)
 {
         return (ieee754_csr.sx & n);
 }
@@ -406,52 +403,34 @@ extern const struct ieee754sp_konst __ieee754sp_spcvals[];
 #define ieee754dp_spcvals ((const ieee754dp *)__ieee754dp_spcvals)
 #define ieee754sp_spcvals ((const ieee754sp *)__ieee754sp_spcvals)
 
-/* return infinity with given sign
-*/
-#define ieee754dp_inf(sn)       \
-  (ieee754dp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)])
-#define ieee754dp_zero(sn) \
-  (ieee754dp_spcvals[IEEE754_SPCVAL_PZERO+(sn)])
-#define ieee754dp_one(sn) \
-  (ieee754dp_spcvals[IEEE754_SPCVAL_PONE+(sn)])
-#define ieee754dp_ten(sn) \
-  (ieee754dp_spcvals[IEEE754_SPCVAL_PTEN+(sn)])
-#define ieee754dp_indef() \
-  (ieee754dp_spcvals[IEEE754_SPCVAL_INDEF])
-#define ieee754dp_max(sn) \
-  (ieee754dp_spcvals[IEEE754_SPCVAL_PMAX+(sn)])
-#define ieee754dp_min(sn) \
-  (ieee754dp_spcvals[IEEE754_SPCVAL_PMIN+(sn)])
-#define ieee754dp_mind(sn) \
-  (ieee754dp_spcvals[IEEE754_SPCVAL_PMIND+(sn)])
-#define ieee754dp_1e31() \
-  (ieee754dp_spcvals[IEEE754_SPCVAL_P1E31])
-#define ieee754dp_1e63() \
-  (ieee754dp_spcvals[IEEE754_SPCVAL_P1E63])
-
-#define ieee754sp_inf(sn) \
-  (ieee754sp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)])
-#define ieee754sp_zero(sn) \
-  (ieee754sp_spcvals[IEEE754_SPCVAL_PZERO+(sn)])
-#define ieee754sp_one(sn) \
-  (ieee754sp_spcvals[IEEE754_SPCVAL_PONE+(sn)])
-#define ieee754sp_ten(sn) \
-  (ieee754sp_spcvals[IEEE754_SPCVAL_PTEN+(sn)])
-#define ieee754sp_indef() \
-  (ieee754sp_spcvals[IEEE754_SPCVAL_INDEF])
-#define ieee754sp_max(sn) \
-  (ieee754sp_spcvals[IEEE754_SPCVAL_PMAX+(sn)])
-#define ieee754sp_min(sn) \
-  (ieee754sp_spcvals[IEEE754_SPCVAL_PMIN+(sn)])
-#define ieee754sp_mind(sn) \
-  (ieee754sp_spcvals[IEEE754_SPCVAL_PMIND+(sn)])
-#define ieee754sp_1e31() \
-  (ieee754sp_spcvals[IEEE754_SPCVAL_P1E31])
-#define ieee754sp_1e63() \
-  (ieee754sp_spcvals[IEEE754_SPCVAL_P1E63])
-
-/* indefinite integer value
-*/
+/*
+ * Return infinity with given sign
+ */
+#define ieee754dp_inf(sn)     (ieee754dp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)])
+#define ieee754dp_zero(sn)      (ieee754dp_spcvals[IEEE754_SPCVAL_PZERO+(sn)])
+#define ieee754dp_one(sn)       (ieee754dp_spcvals[IEEE754_SPCVAL_PONE+(sn)])
+#define ieee754dp_ten(sn)       (ieee754dp_spcvals[IEEE754_SPCVAL_PTEN+(sn)])
+#define ieee754dp_indef()       (ieee754dp_spcvals[IEEE754_SPCVAL_INDEF])
+#define ieee754dp_max(sn)       (ieee754dp_spcvals[IEEE754_SPCVAL_PMAX+(sn)])
+#define ieee754dp_min(sn)       (ieee754dp_spcvals[IEEE754_SPCVAL_PMIN+(sn)])
+#define ieee754dp_mind(sn)      (ieee754dp_spcvals[IEEE754_SPCVAL_PMIND+(sn)])
+#define ieee754dp_1e31()        (ieee754dp_spcvals[IEEE754_SPCVAL_P1E31])
+#define ieee754dp_1e63()        (ieee754dp_spcvals[IEEE754_SPCVAL_P1E63])
+
+#define ieee754sp_inf(sn)     (ieee754sp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)])
+#define ieee754sp_zero(sn)      (ieee754sp_spcvals[IEEE754_SPCVAL_PZERO+(sn)])
+#define ieee754sp_one(sn)       (ieee754sp_spcvals[IEEE754_SPCVAL_PONE+(sn)])
+#define ieee754sp_ten(sn)       (ieee754sp_spcvals[IEEE754_SPCVAL_PTEN+(sn)])
+#define ieee754sp_indef()       (ieee754sp_spcvals[IEEE754_SPCVAL_INDEF])
+#define ieee754sp_max(sn)       (ieee754sp_spcvals[IEEE754_SPCVAL_PMAX+(sn)])
+#define ieee754sp_min(sn)       (ieee754sp_spcvals[IEEE754_SPCVAL_PMIN+(sn)])
+#define ieee754sp_mind(sn)      (ieee754sp_spcvals[IEEE754_SPCVAL_PMIND+(sn)])
+#define ieee754sp_1e31()        (ieee754sp_spcvals[IEEE754_SPCVAL_P1E31])
+#define ieee754sp_1e63()        (ieee754sp_spcvals[IEEE754_SPCVAL_P1E63])
+
+/*
+ * Indefinite integer value
+ */
 #define ieee754si_indef()       INT_MAX
 #ifdef LONG_LONG_MAX
 #define ieee754di_indef()       LONG_LONG_MAX