KVM: x86 emulator: add LOOP/LOOPcc instruction emulation
Add LOOP/LOOPcc instruction emulation (opcode 0xe0~0xe2).
Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 312dda5..2f816ed 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2330,7 +2330,7 @@
/* 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 */
@@ -3084,6 +3084,12 @@
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;