Add XADD instruction emulation (opcode 0x0f 0xc0~0xc1)
Signed-off-by: Wei Yongjun <yjwei@xxxxxxxxxxxxxx>
---
v2 -> v3: add Lock prefix to decode
---
arch/x86/kvm/emulate.c | 7 ++++++-
1 files changed, 6 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 8bf80a9..e091718 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2387,7 +2387,8 @@ static struct opcode twobyte_table[256] = {
D(DstReg | SrcMem | ModRM), D(DstReg | SrcMem | ModRM),
D(ByteOp | DstReg | SrcMem | ModRM | Mov), D(DstReg | SrcMem16 | ModRM | Mov),
/* 0xC0 - 0xCF */
- N, N, N, D(DstMem | SrcReg | ModRM | Mov),
+ D(ByteOp | DstMem | SrcReg | ModRM | Lock), D(DstMem | SrcReg | ModRM | Lock),
+ N, D(DstMem | SrcReg | ModRM | Mov),
N, N, N, GD(0, &group9),
N, N, N, N, N, N, N, N,
/* 0xD0 - 0xDF */
@@ -3532,6 +3533,10 @@ twobyte_insn:
c->dst.val = (c->d & ByteOp) ? (s8) c->src.val :
(s16) c->src.val;
break;
+ case 0xc0 ... 0xc1: /* xadd */
+ /* Write back the register source. */
+ write_register_operand(&c->src, c->dst.val, c->dst.bytes);
+ goto add;
case 0xc3: /* movnti */
c->dst.bytes = c->op_bytes;
c->dst.val = (c->op_bytes == 4) ? (u32) c->src.val :
--
1.7.0.4
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