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KVM: x86 emulator: add LOOP/LOOPcc instruction emulation

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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>
This commit is contained in:
Wei Yongjun 2010-08-18 16:38:21 +08:00 committed by Avi Kivity
parent e8b6fa70e3
commit f2f3184534
1 changed files with 7 additions and 1 deletions
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8
arch/x86/kvm/emulate.c
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@ -2330,7 +2330,7 @@ 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 */
@ -3084,6 +3084,12 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
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;