KVM: x86 emulator: Add decoding of 16bit second immediate argument

Such as segment number in lcall/ljmp

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

1 files changed, 7 insertions, 0 deletions

diff --git a/arch/x86/kvm/x86_emulate.c b/arch/x86/kvm/x86_emulate.c
index d7c9f6fd0d34..c0150636d453 100644
--- a/arch/x86/kvm/x86_emulate.c
+++ b/arch/x86/kvm/x86_emulate.c
@@ -76,6 +76,7 @@
 #define Src2CL      (1<<29)
 #define Src2ImmByte (2<<29)
 #define Src2One     (3<<29)
+#define Src2Imm16   (4<<29)
 #define Src2Mask    (7<<29)
 
 enum {
@@ -1072,6 +1073,12 @@ done_prefixes:
                 c->src2.bytes = 1;
                 c->src2.val = insn_fetch(u8, 1, c->eip);
                 break;
+        case Src2Imm16:
+                c->src2.type = OP_IMM;
+                c->src2.ptr = (unsigned long *)c->eip;
+                c->src2.bytes = 2;
+                c->src2.val = insn_fetch(u16, 2, c->eip);
+                break;
         case Src2One:
                 c->src2.bytes = 1;
                 c->src2.val = 1;