Useful for MOVSX/MOVZX.
Signed-off-by: Avi Kivity <[email protected]>
---
arch/x86/kvm/emulate.c | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 05a562b..92a45dd 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -57,6 +57,7 @@
#define OpDS 23ull /* DS */
#define OpFS 24ull /* FS */
#define OpGS 25ull /* GS */
+#define OpMem8 26ull /* 8-bit zero extended memory operand */
#define OpBits 5 /* Width of operand field */
#define OpMask ((1ull << OpBits) - 1)
@@ -101,6 +102,7 @@
#define SrcAcc (OpAcc << SrcShift)
#define SrcImmU16 (OpImmU16 << SrcShift)
#define SrcDX (OpDX << SrcShift)
+#define SrcMem8 (OpMem8 << SrcShift)
#define SrcMask (OpMask << SrcShift)
#define BitOp (1<<11)
#define MemAbs (1<<12) /* Memory operand is absolute displacement */
@@ -3605,6 +3607,9 @@ static int decode_operand(struct x86_emulate_ctxt *ctxt,
struct operand *op,
case OpImm:
rc = decode_imm(ctxt, op, imm_size(ctxt), true);
break;
+ case OpMem8:
+ ctxt->memop.bytes = 1;
+ goto mem_common;
case OpMem16:
ctxt->memop.bytes = 2;
goto mem_common;
--
1.7.7.1
--
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