diff options
| -rw-r--r-- | target-i386/translate.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/target-i386/translate.c b/target-i386/translate.c index b400d2470a..c6d9be6043 100644 --- a/target-i386/translate.c +++ b/target-i386/translate.c @@ -7716,10 +7716,21 @@ 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 */ |