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x86emu: Fix BSF and BSR instructions 

Patch courtesy of Michael Yaroslavtsev.
Synced from Xorg
http://cgit.freedesktop.org/xorg/xserver/commit/?id=66fa87292ef26bd0f464481287f3af992cd5741c

Change-Id: I266f910d4a535eab4e2ad77f2540f2f1495bed61
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/1360
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
This commit is contained in:
Stefan Reinauer 2012-07-26 15:02:49 -07:00 committed by Ronald G. Minnich
parent 6ff1d36a47
commit 4b80cd45c3
1 changed files with 18 additions and 18 deletions
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36
src/devices/oprom/x86emu/ops2.c
View File

@ -1495,7 +1495,7 @@ 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);
if (mod < 3) {
srcoffset = decode_rmXX_address(mod, rl);
@ -1521,25 +1521,25 @@ static void x86emuOp2_bsf(u8 X86EMU_UNUSED(op2))
}
} else { /* 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;
}
}
DECODE_CLEAR_SEGOVR();
@ -1556,7 +1556,7 @@ 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);
if (mod < 3) {
srcoffset = decode_rmXX_address(mod, rl);
@ -1582,25 +1582,25 @@ static void x86emuOp2_bsr(u8 X86EMU_UNUSED(op2))
}
} else { /* 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;
}
}
DECODE_CLEAR_SEGOVR();