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

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Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2010-08-18 14:51:45 +03:00
parent 7af04fc05c
commit 0ef753b8c3
1 changed files with 36 additions and 1 deletions
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37
arch/x86/kvm/emulate.c
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@ -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,
};