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Fix BSF and BSR instructions in the x86 emulator.

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Patch courtesy of Michael Yaroslavtsev.
This commit is contained in:
Aaron Plattner 2007-01-03 10:27:07 -08:00
parent 3b5b7ef5c2
commit 66fa87292e
1 changed files with 18 additions and 18 deletions
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36
hw/xfree86/x86emu/ops2.c
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@ -2129,7 +2129,7 @@ static void x86emuOp2_bsf(u8 X86EMU_UNUSED(op2))
uint srcoffset;
START_OF_INSTR();
DECODE_PRINTF("BSF\n");
DECODE_PRINTF("BSF\t");
FETCH_DECODE_MODRM(mod, rh, rl);
switch(mod) {
case 0:
@ -2209,25 +2209,25 @@ static void x86emuOp2_bsf(u8 X86EMU_UNUSED(op2))
break;
case 3: /* register to register */
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
u32 *srcreg, *dstreg;
u32 srcval, *dstreg;
srcreg = DECODE_RM_LONG_REGISTER(rl);
srcval = *DECODE_RM_LONG_REGISTER(rl);
DECODE_PRINTF(",");
dstreg = DECODE_RM_LONG_REGISTER(rh);
TRACE_AND_STEP();
CONDITIONAL_SET_FLAG(*srcreg == 0, F_ZF);
CONDITIONAL_SET_FLAG(srcval == 0, F_ZF);
for(*dstreg = 0; *dstreg < 32; (*dstreg)++)
if ((*srcreg >> *dstreg) & 1) break;
if ((srcval >> *dstreg) & 1) break;
} else {
u16 *srcreg, *dstreg;
u16 srcval, *dstreg;
srcreg = DECODE_RM_WORD_REGISTER(rl);
srcval = *DECODE_RM_WORD_REGISTER(rl);
DECODE_PRINTF(",");
dstreg = DECODE_RM_WORD_REGISTER(rh);
TRACE_AND_STEP();
CONDITIONAL_SET_FLAG(*srcreg == 0, F_ZF);
CONDITIONAL_SET_FLAG(srcval == 0, F_ZF);
for(*dstreg = 0; *dstreg < 16; (*dstreg)++)
if ((*srcreg >> *dstreg) & 1) break;
if ((srcval >> *dstreg) & 1) break;
}
break;
}
@ -2245,7 +2245,7 @@ static void x86emuOp2_bsr(u8 X86EMU_UNUSED(op2))
uint srcoffset;
START_OF_INSTR();
DECODE_PRINTF("BSF\n");
DECODE_PRINTF("BSR\t");
FETCH_DECODE_MODRM(mod, rh, rl);
switch(mod) {
case 0:
@ -2325,25 +2325,25 @@ static void x86emuOp2_bsr(u8 X86EMU_UNUSED(op2))
break;
case 3: /* register to register */
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
u32 *srcreg, *dstreg;
u32 srcval, *dstreg;
srcreg = DECODE_RM_LONG_REGISTER(rl);
srcval = *DECODE_RM_LONG_REGISTER(rl);
DECODE_PRINTF(",");
dstreg = DECODE_RM_LONG_REGISTER(rh);
TRACE_AND_STEP();
CONDITIONAL_SET_FLAG(*srcreg == 0, F_ZF);
CONDITIONAL_SET_FLAG(srcval == 0, F_ZF);
for(*dstreg = 31; *dstreg > 0; (*dstreg)--)
if ((*srcreg >> *dstreg) & 1) break;
if ((srcval >> *dstreg) & 1) break;
} else {
u16 *srcreg, *dstreg;
u16 srcval, *dstreg;
srcreg = DECODE_RM_WORD_REGISTER(rl);
srcval = *DECODE_RM_WORD_REGISTER(rl);
DECODE_PRINTF(",");
dstreg = DECODE_RM_WORD_REGISTER(rh);
TRACE_AND_STEP();
CONDITIONAL_SET_FLAG(*srcreg == 0, F_ZF);
CONDITIONAL_SET_FLAG(srcval == 0, F_ZF);
for(*dstreg = 15; *dstreg > 0; (*dstreg)--)
if ((*srcreg >> *dstreg) & 1) break;
if ((srcval >> *dstreg) & 1) break;
}
break;
}