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Fix preemption and SMP problems in the FP emulator code. 

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
hifive-unleashed-5.1
Ralf Baechle 2005-04-28 13:39:10 +00:00
parent 63b2d2f4d2
commit cd21dfcfbb
5 changed files with 120 additions and 117 deletions
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19
arch/mips/kernel/traps.c
View File

@ -551,6 +551,14 @@ asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31)
preempt_disable();
#ifdef CONFIG_PREEMPT
if (!is_fpu_owner()) {
/* We might lose fpu before disabling preempt... */
own_fpu();
BUG_ON(!used_math());
restore_fp(current);
}
#endif
/*
* Unimplemented operation exception. If we've got the full
* software emulator on-board, let's use it...
@ -562,11 +570,18 @@ asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31)
* a bit extreme for what should be an infrequent event.
*/
save_fp(current);
/* Ensure 'resume' not overwrite saved fp context again. */
lose_fpu();
preempt_enable();
/* Run the emulator */
sig = fpu_emulator_cop1Handler (0, regs,
&current->thread.fpu.soft);
preempt_disable();
own_fpu(); /* Using the FPU again. */
/*
* We can't allow the emulated instruction to leave any of
* the cause bit set in $fcr31.
@ -712,6 +727,8 @@ asmlinkage void do_cpu(struct pt_regs *regs)
set_used_math();
}
preempt_enable();
if (!cpu_has_fpu) {
int sig = fpu_emulator_cop1Handler(0, regs,
&current->thread.fpu.soft);
@ -719,8 +736,6 @@ asmlinkage void do_cpu(struct pt_regs *regs)
force_sig(sig, current);
}
preempt_enable();
return;
case 2:

41
arch/mips/math-emu/cp1emu.c
View File

@ -79,7 +79,17 @@ struct mips_fpu_emulator_private fpuemuprivate;
/* Convert Mips rounding mode (0..3) to IEEE library modes. */
static const unsigned char ieee_rm[4] = {
IEEE754_RN, IEEE754_RZ, IEEE754_RU, IEEE754_RD
[FPU_CSR_RN] = IEEE754_RN,
[FPU_CSR_RZ] = IEEE754_RZ,
[FPU_CSR_RU] = IEEE754_RU,
[FPU_CSR_RD] = IEEE754_RD,
};
/* Convert IEEE library modes to Mips rounding mode (0..3). */
static const unsigned char mips_rm[4] = {
[IEEE754_RN] = FPU_CSR_RN,
[IEEE754_RZ] = FPU_CSR_RZ,
[IEEE754_RD] = FPU_CSR_RD,
[IEEE754_RU] = FPU_CSR_RU,
};
#if __mips >= 4
@ -368,6 +378,7 @@ static int cop1Emulate(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx)
}
if (MIPSInst_RD(ir) == FPCREG_CSR) {
value = ctx->fcr31;
value = (value & ~0x3) | mips_rm[value & 0x3];
#ifdef CSRTRACE
printk("%p gpr[%d]<-csr=%08x\n",
(void *) (xcp->cp0_epc),
@ -400,11 +411,10 @@ static int cop1Emulate(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx)
(void *) (xcp->cp0_epc),
MIPSInst_RT(ir), value);
#endif
ctx->fcr31 = value;
/* copy new rounding mode and
flush bit to ieee library state! */
ieee754_csr.nod = (ctx->fcr31 & 0x1000000) != 0;
ieee754_csr.rm = ieee_rm[value & 0x3];
value &= (FPU_CSR_FLUSH | FPU_CSR_ALL_E | FPU_CSR_ALL_S | 0x03);
ctx->fcr31 &= ~(FPU_CSR_FLUSH | FPU_CSR_ALL_E | FPU_CSR_ALL_S | 0x03);
/* convert to ieee library modes */
ctx->fcr31 |= (value & ~0x3) | ieee_rm[value & 0x3];
}
if ((ctx->fcr31 >> 5) & ctx->fcr31 & FPU_CSR_ALL_E) {
return SIGFPE;
@ -570,7 +580,7 @@ static const unsigned char cmptab[8] = {
static ieee754##p fpemu_##p##_##name (ieee754##p r, ieee754##p s, \
ieee754##p t) \
{ \
struct ieee754_csr ieee754_csr_save; \
struct _ieee754_csr ieee754_csr_save; \
s = f1 (s, t); \
ieee754_csr_save = ieee754_csr; \
s = f2 (s, r); \
@ -699,8 +709,6 @@ static int fpux_emu(struct pt_regs *xcp, struct mips_fpu_soft_struct *ctx,
rcsr |= FPU_CSR_INV_X | FPU_CSR_INV_S;
ctx->fcr31 = (ctx->fcr31 & ~FPU_CSR_ALL_X) | rcsr;
if (ieee754_csr.nod)
ctx->fcr31 |= 0x1000000;
if ((ctx->fcr31 >> 5) & ctx->fcr31 & FPU_CSR_ALL_E) {
/*printk ("SIGFPE: fpu csr = %08x\n",
ctx->fcr31); */
@ -1297,12 +1305,17 @@ int fpu_emulator_cop1Handler(int xcptno, struct pt_regs *xcp,
if (insn == 0)
xcp->cp0_epc += 4; /* skip nops */
else {
/* Update ieee754_csr. Only relevant if we have a
h/w FPU */
ieee754_csr.nod = (ctx->fcr31 & 0x1000000) != 0;
ieee754_csr.rm = ieee_rm[ctx->fcr31 & 0x3];
ieee754_csr.cx = (ctx->fcr31 >> 12) & 0x1f;
/*
* The 'ieee754_csr' is an alias of
* ctx->fcr31. No need to copy ctx->fcr31 to
* ieee754_csr. But ieee754_csr.rm is ieee
* library modes. (not mips rounding mode)
*/
/* convert to ieee library modes */
ieee754_csr.rm = ieee_rm[ieee754_csr.rm];
sig = cop1Emulate(xcp, ctx);
/* revert to mips rounding mode */
ieee754_csr.rm = mips_rm[ieee754_csr.rm];
}
if (cpu_has_fpu)

2
arch/mips/math-emu/dp_sqrt.c
View File

@ -37,7 +37,7 @@ static const unsigned table[] = {
ieee754dp ieee754dp_sqrt(ieee754dp x)
{
struct ieee754_csr oldcsr;
struct _ieee754_csr oldcsr;
ieee754dp y, z, t;
unsigned scalx, yh;
COMPXDP;

4
arch/mips/math-emu/ieee754.c
View File

@ -50,10 +50,6 @@ const char *const ieee754_cname[] = {
"SNaN",
};
/* the control status register
*/
struct ieee754_csr ieee754_csr;
/* special constants
*/

171
arch/mips/math-emu/ieee754.h
View File

@ -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])
/*
* 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])
#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
*/
/*
* Indefinite integer value
*/
#define ieee754si_indef() INT_MAX
#ifdef LONG_LONG_MAX
#define ieee754di_indef() LONG_LONG_MAX