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KVM: x86 emulator: implement 'ret far' instruction (opcode 0xcb) 

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2009-01-05 13:27:34 +02:00
parent 8b3079a5c0
commit a77ab5ead5
1 changed files with 25 additions and 1 deletions
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26
arch/x86/kvm/x86_emulate.c
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@ -178,7 +178,7 @@ static u32 opcode_table[256] = {
0, ImplicitOps | Stack, 0, 0,
ByteOp | DstMem | SrcImm | ModRM | Mov, DstMem | SrcImm | ModRM | Mov,
/* 0xC8 - 0xCF */
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, ImplicitOps | Stack, 0, 0, 0, 0,
/* 0xD0 - 0xD7 */
ByteOp | DstMem | SrcImplicit | ModRM, DstMem | SrcImplicit | ModRM,
ByteOp | DstMem | SrcImplicit | ModRM, DstMem | SrcImplicit | ModRM,
@ -1278,6 +1278,25 @@ static inline int emulate_grp9(struct x86_emulate_ctxt *ctxt,
return 0;
}
static int emulate_ret_far(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops)
{
struct decode_cache *c = &ctxt->decode;
int rc;
unsigned long cs;
rc = emulate_pop(ctxt, ops, &c->eip, c->op_bytes);
if (rc)
return rc;
if (c->op_bytes == 4)
c->eip = (u32)c->eip;
rc = emulate_pop(ctxt, ops, &cs, c->op_bytes);
if (rc)
return rc;
rc = kvm_load_segment_descriptor(ctxt->vcpu, (u16)cs, 1, VCPU_SREG_CS);
return rc;
}
static inline int writeback(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops)
{
@ -1735,6 +1754,11 @@ special_insn:
mov:
c->dst.val = c->src.val;
break;
case 0xcb: /* ret far */
rc = emulate_ret_far(ctxt, ops);
if (rc)
goto done;
break;
case 0xd0 ... 0xd1: /* Grp2 */
c->src.val = 1;
emulate_grp2(ctxt);