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Commit 7af04fc0 authored by Avi Kivity's avatar Avi Kivity
Browse files

KVM: x86 emulator: implement DAS (opcode 2F) 



Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent fb2c2641

arch/x86/kvm/emulate.c

+41 −1
Original line number Diff line number Diff line
@@ -2175,6 +2175,45 @@ static int em_push(struct x86_emulate_ctxt *ctxt) 
	return X86EMUL_CONTINUE;

}



static int em_das(struct x86_emulate_ctxt *ctxt)

{

	struct decode_cache *c = &ctxt->decode;

	u8 al, old_al;

	bool af, cf, old_cf;



	cf = ctxt->eflags & X86_EFLAGS_CF;

	al = c->dst.val;



	old_al = al;

	old_cf = cf;

	cf = false;

	af = ctxt->eflags & X86_EFLAGS_AF;

	if ((al & 0x0f) > 9 || af) {

		al -= 6;

		cf = old_cf | (al >= 250);

		af = true;

	} else {

		af = false;

	}

	if (old_al > 0x99 || old_cf) {

		al -= 0x60;

		cf = true;

	}



	c->dst.val = al;

	/* Set PF, ZF, SF */

	c->src.type = OP_IMM;

	c->src.val = 0;

	c->src.bytes = 1;

	emulate_2op_SrcV("or", c->src, c->dst, ctxt->eflags);

	ctxt->eflags &= ~(X86_EFLAGS_AF | X86_EFLAGS_CF);

	if (cf)

		ctxt->eflags |= X86_EFLAGS_CF;

	if (af)

		ctxt->eflags |= X86_EFLAGS_AF;

	return X86EMUL_CONTINUE;

}



#define D(_y) { .flags = (_y) }

#define N    D(0)

#define G(_f, _g) { .flags = ((_f) | Group), .u.group = (_g) }
@@ -2258,7 +2297,8 @@ static struct opcode opcode_table[256] = { 
	/* 0x28 - 0x2F */

	D(ByteOp | DstMem | SrcReg | ModRM | Lock), D(DstMem | SrcReg | ModRM | Lock),

	D(ByteOp | DstReg | SrcMem | ModRM), D(DstReg | SrcMem | ModRM),

	D(ByteOp | DstAcc | SrcImmByte), D(DstAcc | SrcImm), N, N,

	D(ByteOp | DstAcc | SrcImmByte), D(DstAcc | SrcImm),

	N, I(ByteOp | DstAcc | No64, em_das),

	/* 0x30 - 0x37 */

	D(ByteOp | DstMem | SrcReg | ModRM | Lock), D(DstMem | SrcReg | ModRM | Lock),

	D(ByteOp | DstReg | SrcMem | ModRM), D(DstReg | SrcMem | ModRM),