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Commit f2f31845 authored by Wei Yongjun's avatar Wei Yongjun Committed by Avi Kivity
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KVM: x86 emulator: add LOOP/LOOPcc instruction emulation 



Add LOOP/LOOPcc instruction emulation (opcode 0xe0~0xe2).

Signed-off-by: default avatarWei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent e8b6fa70

arch/x86/kvm/emulate.c

+7 −1
Original line number Diff line number Diff line
@@ -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;