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target-i386: tcg: Check right CPUID bits for clflushopt/pcommit

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Detect the clflushopt and pcommit instructions and check their
corresponding feature flags, instead of checking CPUID_SSE and
CPUID_CLFLUSH.

Backports commit 891bc821a3ee462b09b1ec436f2891f00ab1f85b from qemu
This commit is contained in:
Eduardo Habkost 2018-02-17 17:25:26 -05:00 committed by Lioncash
parent 6d0dae872d
commit 4a70bfed55
No known key found for this signature in database
GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 20 additions and 8 deletions
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28
qemu/target-i386/translate.c
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@ -8392,16 +8392,28 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
goto illegal_op;
}
break;
case 7: /* sfence / clflush */
case 7: /* sfence / clflush / clflushopt / pcommit */
if ((modrm & 0xc7) == 0xc0) {
/* sfence */
/* XXX: also check for cpuid_ext2_features & CPUID_EXT2_EMMX */
if (!(s->cpuid_features & CPUID_SSE))
goto illegal_op;
if (s->prefix & PREFIX_DATA) {
/* pcommit */
if (!(s->cpuid_7_0_ebx_features & CPUID_7_0_EBX_PCOMMIT))
goto illegal_op;
} else {
/* sfence */
/* XXX: also check for cpuid_ext2_features & CPUID_EXT2_EMMX */
if (!(s->cpuid_features & CPUID_SSE))
goto illegal_op;
}
} else {
/* clflush */
if (!(s->cpuid_features & CPUID_CLFLUSH))
goto illegal_op;
if (s->prefix & PREFIX_DATA) {
/* clflushopt */
if (!(s->cpuid_7_0_ebx_features & CPUID_7_0_EBX_CLFLUSHOPT))
goto illegal_op;
} else {
/* clflush */
if (!(s->cpuid_features & CPUID_CLFLUSH))
goto illegal_op;
}
gen_lea_modrm(env, s, modrm);
}
break;