KVM: x86 emulator: implement RET imm16 (opcode C2)

Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index db80e28..9e58f50 100644 (file)
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2249,6 +2249,21 @@ static int em_call_far(struct x86_emulate_ctxt *ctxt)
        return X86EMUL_CONTINUE;
 }
 
+static int em_ret_near_imm(struct x86_emulate_ctxt *ctxt)
+{
+       struct decode_cache *c = &ctxt->decode;
+       int rc;
+
+       c->dst.type = OP_REG;
+       c->dst.addr.reg = &c->eip;
+       c->dst.bytes = c->op_bytes;
+       rc = emulate_pop(ctxt, ctxt->ops, &c->dst.val, c->op_bytes);
+       if (rc != X86EMUL_CONTINUE)
+               return rc;
+       register_address_increment(c, &c->regs[VCPU_REGS_RSP], c->src.val);
+       return X86EMUL_CONTINUE;
+}
+
 #define D(_y) { .flags = (_y) }
 #define N    D(0)
 #define G(_f, _g) { .flags = ((_f) | Group), .u.group = (_g) }
@@ -2394,7 +2409,9 @@ static struct opcode opcode_table[256] = {
        X8(D(DstReg | SrcImm | Mov)),
        /* 0xC0 - 0xC7 */
        D(ByteOp | DstMem | SrcImm | ModRM), D(DstMem | SrcImmByte | ModRM),
-       N, D(ImplicitOps | Stack), N, N,
+       I(ImplicitOps | Stack | SrcImmU16, em_ret_near_imm),
+       D(ImplicitOps | Stack),
+       N, N,
        D(ByteOp | DstMem | SrcImm | ModRM | Mov), D(DstMem | SrcImm | ModRM | Mov),
        /* 0xC8 - 0xCF */
        N, N, N, D(ImplicitOps | Stack),