From: Wei Yongjun <yjwei@cn.fujitsu.com>
Date: Wed, 18 Aug 2010 08:38:21 +0000 (+0800)
Subject: KVM: x86 emulator: add LOOP/LOOPcc instruction emulation
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=f2f31845341d22e4f20438b05e83d58e71b723b5;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git

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 312dda57f93b..2f816edfe31e 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -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 @@ 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;