Add LOOP/LOOPcc instruction emulation (opcode 0xe0~0xe2).
Signed-off-by: Wei Yongjun <yjwei@xxxxxxxxxxxxxx>
---
arch/x86/kvm/emulate.c | 8 +++++++-
1 files changed, 7 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index ac13831..46b7da8 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2320,7 +2320,7 @@ static struct opcode opcode_table[256] = {
/* 0xD8 - 0xDF */
N, N, N, N, N, N, N, N,
/* 0xE0 - 0xE7 */
- N, N, N, N,
+ X3(D(SrcImmByte)), N,
D(ByteOp | SrcImmUByte | DstAcc), D(SrcImmUByte | DstAcc),
D(ByteOp | SrcAcc | DstImmUByte), D(SrcAcc | DstImmUByte),
/* 0xE8 - 0xEF */
@@ -3086,6 +3086,12 @@ special_insn:
c->src.val = c->regs[VCPU_REGS_RCX];
emulate_grp2(ctxt);
break;
+ case 0xe0 ... 0xe2: /* loop/loopz/loopnz */
+ register_address_increment(c, &c->regs[VCPU_REGS_RCX], -1);
+ if (address_mask(c, c->regs[VCPU_REGS_RCX]) != 0 &&
+ (c->b == 0xe2 || test_cc(c->b ^ 0x5, ctxt->eflags)))
+ jmp_rel(c, c->src.val);
+ break;
case 0xe4: /* inb */
case 0xe5: /* in */
goto do_io_in;
--
1.7.0.4
--
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