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KVM: x86 emulator: covert SETCC to fastop 

This is a bit of a special case since we don't have the usual
byte/word/long/quad switch; instead we switch on the condition code embedded
in the instruction.

Reviewed-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi.kivity@gmail.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Avi Kivity 2013-01-19 19:51:52 +02:00 committed by Marcelo Tosatti
parent 007a3b5475
commit 9ae9febae9
1 changed files with 29 additions and 31 deletions
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60
arch/x86/kvm/emulate.c
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@ -499,6 +499,28 @@ static void invalidate_registers(struct x86_emulate_ctxt *ctxt)
ON64(FOP3E(op##q, rax, rbx, cl)) \
FOP_END
/* Special case for SETcc - 1 instruction per cc */
#define FOP_SETCC(op) ".align 4; " #op " %al; ret \n\t"
FOP_START(setcc)
FOP_SETCC(seto)
FOP_SETCC(setno)
FOP_SETCC(setc)
FOP_SETCC(setnc)
FOP_SETCC(setz)
FOP_SETCC(setnz)
FOP_SETCC(setbe)
FOP_SETCC(setnbe)
FOP_SETCC(sets)
FOP_SETCC(setns)
FOP_SETCC(setp)
FOP_SETCC(setnp)
FOP_SETCC(setl)
FOP_SETCC(setnl)
FOP_SETCC(setle)
FOP_SETCC(setnle)
FOP_END;
#define __emulate_1op_rax_rdx(ctxt, _op, _suffix, _ex) \
do { \
unsigned long _tmp; \
@ -939,39 +961,15 @@ static int read_descriptor(struct x86_emulate_ctxt *ctxt,
return rc;
}
static int test_cc(unsigned int condition, unsigned int flags)
static u8 test_cc(unsigned int condition, unsigned long flags)
{
int rc = 0;
u8 rc;
void (*fop)(void) = (void *)em_setcc + 4 * (condition & 0xf);
switch ((condition & 15) >> 1) {
case 0: /* o */
rc |= (flags & EFLG_OF);
break;
case 1: /* b/c/nae */
rc |= (flags & EFLG_CF);
break;
case 2: /* z/e */
rc |= (flags & EFLG_ZF);
break;
case 3: /* be/na */
rc |= (flags & (EFLG_CF|EFLG_ZF));
break;
case 4: /* s */
rc |= (flags & EFLG_SF);
break;
case 5: /* p/pe */
rc |= (flags & EFLG_PF);
break;
case 7: /* le/ng */
rc |= (flags & EFLG_ZF);
/* fall through */
case 6: /* l/nge */
rc |= (!(flags & EFLG_SF) != !(flags & EFLG_OF));
break;
}
/* Odd condition identifiers (lsb == 1) have inverted sense. */
return (!!rc ^ (condition & 1));
flags = (flags & EFLAGS_MASK) | X86_EFLAGS_IF;
asm("pushq %[flags]; popf; call *%[fastop]"
: "=a"(rc) : [fastop]"r"(fop), [flags]"r"(flags));
return rc;
}
static void fetch_register_operand(struct operand *op)