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KVM: x86 emulator: move string instruction completion check into separate function

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Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Gleb Natapov 2010-08-25 12:47:42 +03:00 committed by Avi Kivity
parent 6e2fb2cadd
commit 3e2f65d57a
1 changed files with 24 additions and 13 deletions
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37
arch/x86/kvm/emulate.c
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@ -2933,6 +2933,28 @@ x86_decode_insn(struct x86_emulate_ctxt *ctxt)
return (rc == X86EMUL_UNHANDLEABLE) ? -1 : 0;
}
static bool string_insn_completed(struct x86_emulate_ctxt *ctxt)
{
struct decode_cache *c = &ctxt->decode;
/* The second termination condition only applies for REPE
* and REPNE. Test if the repeat string operation prefix is
* REPE/REPZ or REPNE/REPNZ and if it's the case it tests the
* corresponding termination condition according to:
* - if REPE/REPZ and ZF = 0 then done
* - if REPNE/REPNZ and ZF = 1 then done
*/
if (((c->b == 0xa6) || (c->b == 0xa7) ||
(c->b == 0xae) || (c->b == 0xaf))
&& (((c->rep_prefix == REPE_PREFIX) &&
((ctxt->eflags & EFLG_ZF) == 0))
|| ((c->rep_prefix == REPNE_PREFIX) &&
((ctxt->eflags & EFLG_ZF) == EFLG_ZF))))
return true;
return false;
}
int
x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
{
@ -3423,19 +3445,8 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
if (c->rep_prefix && (c->d & String)) {
struct read_cache *r = &ctxt->decode.io_read;
register_address_increment(c, &c->regs[VCPU_REGS_RCX], -1);
/* The second termination condition only applies for REPE
* and REPNE. Test if the repeat string operation prefix is
* REPE/REPZ or REPNE/REPNZ and if it's the case it tests the
* corresponding termination condition according to:
* - if REPE/REPZ and ZF = 0 then done
* - if REPNE/REPNZ and ZF = 1 then done
*/
if (((c->b == 0xa6) || (c->b == 0xa7) ||
(c->b == 0xae) || (c->b == 0xaf))
&& (((c->rep_prefix == REPE_PREFIX) &&
((ctxt->eflags & EFLG_ZF) == 0))
|| ((c->rep_prefix == REPNE_PREFIX) &&
((ctxt->eflags & EFLG_ZF) == EFLG_ZF))))
if (string_insn_completed(ctxt))
ctxt->restart = false;
/*
* Re-enter guest when pio read ahead buffer is empty or,