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Commit cee48bdc authored by David S. Miller's avatar David S. Miller
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Sparc64 math-emu fix: 

- UltraSPARC-III can generate unfinished FPops for F{I,X}TO{S,D}
  so handle it.
parent bb573986
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Showing with 58 additions and 38 deletions
arch/sparc64/math-emu/math.c
View file @ cee48bdc
/* $Id: math.c,v 1.12 2002/02/09 19:49:31 davem Exp $
/* $Id: math.c,v 1.11 1999/12/20 05:02:25 davem Exp $
* arch/sparc64/math-emu/math.c
*
* Copyright (C) 1997,1999 Jakub Jelinek (jj@ultra.linux.cz)
......@@ -10,7 +10,6 @@
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <asm/fpumacro.h>
#include <asm/ptrace.h>
......@@ -58,6 +57,12 @@
#define FSTOD 0x0c9
#define FSTOI 0x0d1
#define FDTOI 0x0d2
#define FXTOS 0x084 /* Only Ultra-III generates this. */
#define FXTOD 0x088 /* Only Ultra-III generates this. */
#if 0 /* Optimized inline in sparc64/kernel/entry.S */
#define FITOS 0x0c4 /* Only Ultra-III generates this. */
#endif
#define FITOD 0x0c8 /* Only Ultra-III generates this. */
/* FPOP2 */
#define FCMPQ 0x053
#define FCMPEQ 0x057
......@@ -91,25 +96,25 @@
*/
static inline int record_exception(struct pt_regs *regs, int eflag)
{
u64 fsr = current_thread_info()->xfsr[0];
u64 fsr = current->thread.xfsr[0];
int would_trap;
/* Determine if this exception would have generated a trap. */
would_trap = (fsr & ((long)eflag << FSR_TEM_SHIFT)) != 0UL;
/* If trapping, we only want to signal one bit. */
if (would_trap != 0) {
if(would_trap != 0) {
eflag &= ((fsr & FSR_TEM_MASK) >> FSR_TEM_SHIFT);
if ((eflag & (eflag - 1)) != 0) {
if (eflag & FP_EX_INVALID)
if((eflag & (eflag - 1)) != 0) {
if(eflag & FP_EX_INVALID)
eflag = FP_EX_INVALID;
else if (eflag & FP_EX_OVERFLOW)
else if(eflag & FP_EX_OVERFLOW)
eflag = FP_EX_OVERFLOW;
else if (eflag & FP_EX_UNDERFLOW)
else if(eflag & FP_EX_UNDERFLOW)
eflag = FP_EX_UNDERFLOW;
else if (eflag & FP_EX_DIVZERO)
else if(eflag & FP_EX_DIVZERO)
eflag = FP_EX_DIVZERO;
else if (eflag & FP_EX_INEXACT)
else if(eflag & FP_EX_INEXACT)
eflag = FP_EX_INEXACT;
}
}
......@@ -129,19 +134,19 @@ static inline int record_exception(struct pt_regs *regs, int eflag)
* CEXC just generated is OR'd into the
* existing value of AEXC.
*/
if (would_trap == 0)
if(would_trap == 0)
fsr |= ((long)eflag << FSR_AEXC_SHIFT);
/* If trapping, indicate fault trap type IEEE. */
if (would_trap != 0)
if(would_trap != 0)
fsr |= (1UL << 14);
current_thread_info()->xfsr[0] = fsr;
current->thread.xfsr[0] = fsr;
/* If we will not trap, advance the program counter over
* the instruction being handled.
*/
if (would_trap == 0) {
if(would_trap == 0) {
regs->tpc = regs->tnpc;
regs->tnpc += 4;
}
......@@ -175,10 +180,10 @@ int do_mathemu(struct pt_regs *regs, struct fpustate *f)
int IR;
long XR, xfsr;
if (tstate & TSTATE_PRIV)
die_if_kernel("FPQuad from kernel", regs);
if (test_thread_flag(TIF_32BIT))
pc &= 0xffffffff;
if(tstate & TSTATE_PRIV)
die_if_kernel("unfinished/unimplemented FPop from kernel", regs);
if(current->thread.flags & SPARC_FLAG_32BIT)
pc = (u32)pc;
if (get_user(insn, (u32 *)pc) != -EFAULT) {
if ((insn & 0xc1f80000) == 0x81a00000) /* FPOP1 */ {
switch ((insn >> 5) & 0x1ff) {
......@@ -218,6 +223,14 @@ int do_mathemu(struct pt_regs *regs, struct fpustate *f)
case FSTOD: TYPE(2,2,1,1,1,0,0); break;
case FSTOI: TYPE(2,1,0,1,1,0,0); break;
case FDTOI: TYPE(2,1,0,2,1,0,0); break;
/* Only Ultra-III generates these */
case FXTOS: TYPE(2,1,1,2,0,0,0); break;
case FXTOD: TYPE(2,2,1,2,0,0,0); break;
#if 0 /* Optimized inline in sparc64/kernel/entry.S */
case FITOS: TYPE(2,1,1,1,0,0,0); break;
#endif
case FITOD: TYPE(2,2,1,1,0,0,0); break;
}
}
else if ((insn & 0xc1f80000) == 0x81a80000) /* FPOP2 */ {
......@@ -232,9 +245,9 @@ int do_mathemu(struct pt_regs *regs, struct fpustate *f)
case FMOVQ3:
/* fmovq %fccX, %fY, %fZ */
if (!((insn >> 11) & 3))
XR = current_thread_info()->xfsr[0] >> 10;
XR = current->thread.xfsr[0] >> 10;
else
XR = current_thread_info()->xfsr[0] >> (30 + ((insn >> 10) & 0x6));
XR = current->thread.xfsr[0] >> (30 + ((insn >> 10) & 0x6));
XR &= 3;
IR = 0;
switch ((insn >> 14) & 0x7) {
......@@ -283,7 +296,7 @@ int do_mathemu(struct pt_regs *regs, struct fpustate *f)
XR = 0;
else if (freg < 16)
XR = regs->u_regs[freg];
else if (test_thread_flag(TIF_32BIT)) {
else if (current->thread.flags & SPARC_FLAG_32BIT) {
struct reg_window32 *win32;
flushw_user ();
win32 = (struct reg_window32 *)((unsigned long)((u32)regs->u_regs[UREG_FP]));
......@@ -306,7 +319,7 @@ int do_mathemu(struct pt_regs *regs, struct fpustate *f)
}
if (IR == 0) {
/* The fmov test was false. Do a nop instead */
current_thread_info()->xfsr[0] &= ~(FSR_CEXC_MASK);
current->thread.xfsr[0] &= ~(FSR_CEXC_MASK);
regs->tpc = regs->tnpc;
regs->tnpc += 4;
return 1;
......@@ -320,20 +333,20 @@ int do_mathemu(struct pt_regs *regs, struct fpustate *f)
if (type) {
argp rs1 = NULL, rs2 = NULL, rd = NULL;
freg = (current_thread_info()->xfsr[0] >> 14) & 0xf;
freg = (current->thread.xfsr[0] >> 14) & 0xf;
if (freg != (type >> 9))
goto err;
current_thread_info()->xfsr[0] &= ~0x1c000;
current->thread.xfsr[0] &= ~0x1c000;
freg = ((insn >> 14) & 0x1f);
switch (type & 0x3) {
case 3: if (freg & 2) {
current_thread_info()->xfsr[0] |= (6 << 14) /* invalid_fp_register */;
current->thread.xfsr[0] |= (6 << 14) /* invalid_fp_register */;
goto err;
}
case 2: freg = ((freg & 1) << 5) | (freg & 0x1e);
case 1: rs1 = (argp)&f->regs[freg];
flags = (freg < 32) ? FPRS_DL : FPRS_DU;
if (!(current_thread_info()->fpsaved[0] & flags))
if (!(current->thread.fpsaved[0] & flags))
rs1 = (argp)&zero;
break;
}
......@@ -345,13 +358,13 @@ int do_mathemu(struct pt_regs *regs, struct fpustate *f)
freg = (insn & 0x1f);
switch ((type >> 3) & 0x3) {
case 3: if (freg & 2) {
current_thread_info()->xfsr[0] |= (6 << 14) /* invalid_fp_register */;
current->thread.xfsr[0] |= (6 << 14) /* invalid_fp_register */;
goto err;
}
case 2: freg = ((freg & 1) << 5) | (freg & 0x1e);
case 1: rs2 = (argp)&f->regs[freg];
flags = (freg < 32) ? FPRS_DL : FPRS_DU;
if (!(current_thread_info()->fpsaved[0] & flags))
if (!(current->thread.fpsaved[0] & flags))
rs2 = (argp)&zero;
break;
}
......@@ -363,23 +376,23 @@ int do_mathemu(struct pt_regs *regs, struct fpustate *f)
freg = ((insn >> 25) & 0x1f);
switch ((type >> 6) & 0x3) {
case 3: if (freg & 2) {
current_thread_info()->xfsr[0] |= (6 << 14) /* invalid_fp_register */;
current->thread.xfsr[0] |= (6 << 14) /* invalid_fp_register */;
goto err;
}
case 2: freg = ((freg & 1) << 5) | (freg & 0x1e);
case 1: rd = (argp)&f->regs[freg];
flags = (freg < 32) ? FPRS_DL : FPRS_DU;
if (!(current_thread_info()->fpsaved[0] & FPRS_FEF)) {
current_thread_info()->fpsaved[0] = FPRS_FEF;
current_thread_info()->gsr[0] = 0;
if (!(current->thread.fpsaved[0] & FPRS_FEF)) {
current->thread.fpsaved[0] = FPRS_FEF;
current->thread.gsr[0] = 0;
}
if (!(current_thread_info()->fpsaved[0] & flags)) {
if (!(current->thread.fpsaved[0] & flags)) {
if (freg < 32)
memset(f->regs, 0, 32*sizeof(u32));
else
memset(f->regs+32, 0, 32*sizeof(u32));
}
current_thread_info()->fpsaved[0] |= flags;
current->thread.fpsaved[0] |= flags;
break;
}
switch ((insn >> 5) & 0x1ff) {
......@@ -421,6 +434,13 @@ int do_mathemu(struct pt_regs *regs, struct fpustate *f)
/* int to float */
case FITOQ: IR = rs2->s; FP_FROM_INT_Q (QR, IR, 32, int); break;
case FXTOQ: XR = rs2->d; FP_FROM_INT_Q (QR, XR, 64, long); break;
/* Only Ultra-III generates these */
case FXTOS: XR = rs2->d; FP_FROM_INT_S (SR, XR, 64, long); break;
case FXTOD: XR = rs2->d; FP_FROM_INT_D (DR, XR, 64, long); break;
#if 0 /* Optimized inline in sparc64/kernel/entry.S */
case FITOS: IR = rs2->s; FP_FROM_INT_S (SR, IR, 32, int); break;
#endif
case FITOD: IR = rs2->s; FP_FROM_INT_D (DR, IR, 32, int); break;
/* float to float */
case FSTOD: FP_CONV (D, S, 1, 1, DR, SB); break;
case FSTOQ: FP_CONV (Q, S, 2, 1, QR, SB); break;
......@@ -440,7 +460,7 @@ int do_mathemu(struct pt_regs *regs, struct fpustate *f)
}
if (!FP_INHIBIT_RESULTS) {
switch ((type >> 6) & 0x7) {
case 0: xfsr = current_thread_info()->xfsr[0];
case 0: xfsr = current->thread.xfsr[0];
if (XR == -1) XR = 2;
switch (freg & 3) {
/* fcc0, 1, 2, 3 */
......@@ -449,7 +469,7 @@ int do_mathemu(struct pt_regs *regs, struct fpustate *f)
case 2: xfsr &= ~0xc00000000UL; xfsr |= (XR << 34); break;
case 3: xfsr &= ~0x3000000000UL; xfsr |= (XR << 36); break;
}
current_thread_info()->xfsr[0] = xfsr;
current->thread.xfsr[0] = xfsr;
break;
case 1: rd->s = IR; break;
case 2: rd->d = XR; break;
......@@ -459,11 +479,11 @@ int do_mathemu(struct pt_regs *regs, struct fpustate *f)
}
}
if (_fex != 0)
if(_fex != 0)
return record_exception(regs, _fex);
/* Success and no exceptions detected. */
current_thread_info()->xfsr[0] &= ~(FSR_CEXC_MASK);
current->thread.xfsr[0] &= ~(FSR_CEXC_MASK);
regs->tpc = regs->tnpc;
regs->tnpc += 4;
return 1;
......
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