KVM: x86 emulator: Use opcode::execute for POP reg (58-5F)

In addition, the RET emulation is changed to call em_pop() to remove
the pop_instruction label.

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 8784916..9f491bf 100644 (file)
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -1400,6 +1400,13 @@ static int emulate_pop(struct x86_emulate_ctxt *ctxt,
        return rc;
 }
 
+static int em_pop(struct x86_emulate_ctxt *ctxt)
+{
+       struct decode_cache *c = &ctxt->decode;
+
+       return emulate_pop(ctxt, ctxt->ops, &c->dst.val, c->op_bytes);
+}
+
 static int emulate_popf(struct x86_emulate_ctxt *ctxt,
                       struct x86_emulate_ops *ops,
                       void *dest, int len)
@@ -3089,7 +3096,7 @@ static struct opcode opcode_table[256] = {
        /* 0x50 - 0x57 */
        X8(I(SrcReg | Stack, em_push)),
        /* 0x58 - 0x5F */
-       X8(D(DstReg | Stack)),
+       X8(I(DstReg | Stack, em_pop)),
        /* 0x60 - 0x67 */
        D(ImplicitOps | Stack | No64), D(ImplicitOps | Stack | No64),
        N, D(DstReg | SrcMem32 | ModRM | Mov) /* movsxd (x86/64) */ ,
@@ -3816,10 +3823,6 @@ special_insn:
        case 0x48 ... 0x4f: /* dec r16/r32 */
                emulate_1op("dec", c->dst, ctxt->eflags);
                break;
-       case 0x58 ... 0x5f: /* pop reg */
-       pop_instruction:
-               rc = emulate_pop(ctxt, ops, &c->dst.val, c->op_bytes);
-               break;
        case 0x60:      /* pusha */
                rc = emulate_pusha(ctxt);
                break;
@@ -3922,7 +3925,8 @@ special_insn:
                c->dst.type = OP_REG;
                c->dst.addr.reg = &c->eip;
                c->dst.bytes = c->op_bytes;
-               goto pop_instruction;
+               rc = em_pop(ctxt);
+               break;
        case 0xc4:              /* les */
                rc = emulate_load_segment(ctxt, ops, VCPU_SREG_ES);
                break;