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Commit 0ef753b8 authored by Avi Kivity's avatar Avi Kivity
Browse files

KVM: x86 emulator: implement CALL FAR (FF /3) 



Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 7af04fc0

arch/x86/kvm/emulate.c

+36 −1
Original line number Diff line number Diff line
@@ -2214,6 +2214,40 @@ static int em_das(struct x86_emulate_ctxt *ctxt) 
	return X86EMUL_CONTINUE;

}



static int em_call_far(struct x86_emulate_ctxt *ctxt)

{

	struct decode_cache *c = &ctxt->decode;

	u16 sel, old_cs;

	ulong old_eip;

	int rc;



	old_cs = ctxt->ops->get_segment_selector(VCPU_SREG_CS, ctxt->vcpu);

	old_eip = c->eip;



	memcpy(&sel, c->src.valptr + c->op_bytes, 2);

	if (load_segment_descriptor(ctxt, ctxt->ops, sel, VCPU_SREG_CS))

		return X86EMUL_CONTINUE;



	c->eip = 0;

	memcpy(&c->eip, c->src.valptr, c->op_bytes);



	c->src.val = old_cs;

	emulate_push(ctxt, ctxt->ops);

	rc = writeback(ctxt, ctxt->ops);

	if (rc != X86EMUL_CONTINUE)

		return rc;



	c->src.val = old_eip;

	emulate_push(ctxt, ctxt->ops);

	rc = writeback(ctxt, ctxt->ops);

	if (rc != X86EMUL_CONTINUE)

		return rc;



	c->dst.type = OP_NONE;



	return X86EMUL_CONTINUE;

}



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

#define N    D(0)

#define G(_f, _g) { .flags = ((_f) | Group), .u.group = (_g) }
@@ -2241,7 +2275,8 @@ static struct opcode group4[] = { 


static struct opcode group5[] = {

	D(DstMem | SrcNone | ModRM | Lock), D(DstMem | SrcNone | ModRM | Lock),

	D(SrcMem | ModRM | Stack), N,

	D(SrcMem | ModRM | Stack),

	I(SrcMemFAddr | ModRM | ImplicitOps | Stack, em_call_far),

	D(SrcMem | ModRM | Stack), D(SrcMemFAddr | ModRM | ImplicitOps),

	D(SrcMem | ModRM | Stack), N,

};