KVM: X86 emulator: jump conditional short

Implement emulation of more jump conditional instructions
    jcc shortrel
    opcodes: 0x70 - 0x7f

Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

diff --git a/drivers/kvm/x86_emulate.c b/drivers/kvm/x86_emulate.c
index ba53e59..57f1a5a 100644 (file)
--- a/drivers/kvm/x86_emulate.c
+++ b/drivers/kvm/x86_emulate.c
@@ -111,8 +111,12 @@ static u8 opcode_table[256] = {
        0, 0, ImplicitOps|Mov, 0,
        SrcNone  | ByteOp  | ImplicitOps, SrcNone  | ImplicitOps, /* insb, insw/insd */
        SrcNone  | ByteOp  | ImplicitOps, SrcNone  | ImplicitOps, /* outsb, outsw/outsd */
-       /* 0x70 - 0x7F */
-       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+       /* 0x70 - 0x77 */
+       ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
+       ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
+       /* 0x78 - 0x7F */
+       ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
+       ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
        /* 0x80 - 0x87 */
        ByteOp | DstMem | SrcImm | ModRM, DstMem | SrcImm | ModRM,
        ByteOp | DstMem | SrcImm | ModRM, DstMem | SrcImmByte | ModRM,
@@ -1268,6 +1272,13 @@ special_insn:
                                ) == 0)
                        return -1;
                return 0;
+       case 0x70 ... 0x7f: /* jcc (short) */ {
+               int rel = insn_fetch(s8, 1, _eip);
+
+               if (test_cc(b, _eflags))
+               JMP_REL(rel);
+               break;
+       }
        case 0x9c: /* pushf */
                src.val =  (unsigned long) _eflags;
                goto push;