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target-i386: tcg: Accept clwb instruction

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Accept the clwb instruction (66 0F AE /6) if its corresponding feature
flag is enabled on CPUID[7].

Backports commit 5e1fac2dba7780e0cb2c022d4b39586af70bea0d from qemu
This commit is contained in:
Eduardo Habkost 2018-02-17 17:23:33 -05:00 committed by Lioncash
parent 479f36ef8e
commit 6d0dae872d
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 12 additions and 1 deletions
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13
qemu/target-i386/translate.c
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@ -8377,10 +8377,21 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
}
break;
case 5: /* lfence */
case 6: /* mfence */
if ((modrm & 0xc7) != 0xc0 || !(s->cpuid_features & CPUID_SSE2))
goto illegal_op;
break;
case 6: /* mfence/clwb */
if (s->prefix & PREFIX_DATA) {
/* clwb */
if (!(s->cpuid_7_0_ebx_features & CPUID_7_0_EBX_CLWB))
goto illegal_op;
gen_nop_modrm(env, s, modrm);
} else {
/* mfence */
if ((modrm & 0xc7) != 0xc0 || !(s->cpuid_features & CPUID_SSE2))
goto illegal_op;
}
break;
case 7: /* sfence / clflush */
if ((modrm & 0xc7) == 0xc0) {
/* sfence */