Commit 7f662273 authored by Gleb Natapov's avatar Gleb Natapov Committed by Marcelo Tosatti
Browse files

KVM: emulator: implement AAD instruction 

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



Signed-off-by: default avatarGleb Natapov <gleb@redhat.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent 66cdd0ce

arch/x86/kvm/emulate.c

+22 −1
Original line number Diff line number Diff line
@@ -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 */