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KVM: emulator: implement AAD instruction

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Windows2000 uses it during boot. This fixes
https://bugzilla.kernel.org/show_bug.cgi?id=50921

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Gleb Natapov 2012-12-10 11:42:30 +02:00 committed by Marcelo Tosatti
parent 66cdd0ceaf
commit 7f662273e4
1 changed files with 22 additions and 1 deletions
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23
arch/x86/kvm/emulate.c
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@ -2852,6 +2852,27 @@ static int em_das(struct x86_emulate_ctxt *ctxt)
return X86EMUL_CONTINUE;
}
static int em_aad(struct x86_emulate_ctxt *ctxt)
{
u8 al = ctxt->dst.val & 0xff;
u8 ah = (ctxt->dst.val >> 8) & 0xff;
al = (al + (ah * ctxt->src.val)) & 0xff;
ctxt->dst.val = (ctxt->dst.val & 0xffff0000) | al;
ctxt->eflags &= ~(X86_EFLAGS_PF | X86_EFLAGS_SF | X86_EFLAGS_ZF);
if (!al)
ctxt->eflags |= X86_EFLAGS_ZF;
if (!(al & 1))
ctxt->eflags |= X86_EFLAGS_PF;
if (al & 0x80)
ctxt->eflags |= X86_EFLAGS_SF;
return X86EMUL_CONTINUE;
}
static int em_call(struct x86_emulate_ctxt *ctxt)
{
long rel = ctxt->src.val;
@ -3801,7 +3822,7 @@ static const struct opcode opcode_table[256] = {
D(ImplicitOps | No64), II(ImplicitOps, em_iret, iret),
/* 0xD0 - 0xD7 */
D2bv(DstMem | SrcOne | ModRM), D2bv(DstMem | ModRM),
N, N, N, N,
N, I(DstAcc | SrcImmByte | No64, em_aad), N, N,
/* 0xD8 - 0xDF */
N, N, N, N, N, N, N, N,
/* 0xE0 - 0xE7 */