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KVM: x86 emulator: Use opcode::execute for LOOP/JCXZ

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LOOP/LOOPcc      : E0-E2
  JCXZ/JECXZ/JRCXZ : E3

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Takuya Yoshikawa 2011-05-29 22:04:08 +09:00 committed by Avi Kivity
parent 5c5df76b8b
commit d06e03adcb
1 changed files with 24 additions and 11 deletions
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35
arch/x86/kvm/emulate.c
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@ -2824,6 +2824,28 @@ static int em_lmsw(struct x86_emulate_ctxt *ctxt)
return X86EMUL_CONTINUE;
}
static int em_loop(struct x86_emulate_ctxt *ctxt)
{
struct decode_cache *c = &ctxt->decode;
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);
return X86EMUL_CONTINUE;
}
static int em_jcxz(struct x86_emulate_ctxt *ctxt)
{
struct decode_cache *c = &ctxt->decode;
if (address_mask(c, c->regs[VCPU_REGS_RCX]) == 0)
jmp_rel(c, c->src.val);
return X86EMUL_CONTINUE;
}
static bool valid_cr(int nr)
{
switch (nr) {
@ -3240,7 +3262,8 @@ static struct opcode opcode_table[256] = {
/* 0xD8 - 0xDF */
N, N, N, N, N, N, N, N,
/* 0xE0 - 0xE7 */
X4(D(SrcImmByte)),
X3(I(SrcImmByte, em_loop)),
I(SrcImmByte, em_jcxz),
D2bvIP(SrcImmUByte | DstAcc, in, check_perm_in),
D2bvIP(SrcAcc | DstImmUByte, out, check_perm_out),
/* 0xE8 - 0xEF */
@ -3978,16 +4001,6 @@ special_insn:
c->src.val = c->regs[VCPU_REGS_RCX];
rc = em_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 0xe3: /* jcxz/jecxz/jrcxz */
if (address_mask(c, c->regs[VCPU_REGS_RCX]) == 0)
jmp_rel(c, c->src.val);
break;
case 0xe4: /* inb */
case 0xe5: /* in */
goto do_io_in;