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KVM: x86 emulator: convert single-operand MUL/IMUL to fastop

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Signed-off-by: Avi Kivity <avi.kivity@gmail.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
This commit is contained in:
Avi Kivity 2013-02-09 11:31:48 +02:00 committed by Gleb Natapov
parent 017da7b604
commit b9fa409b00
1 changed files with 16 additions and 19 deletions
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35
arch/x86/kvm/emulate.c
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@ -480,6 +480,15 @@ static int fastop(struct x86_emulate_ctxt *ctxt, void (*fop)(struct fastop *));
ON64(FOP1E(op##q, rax)) \
FOP_END
/* 1-operand, using src2 (for MUL/DIV r/m) */
#define FASTOP1SRC2(op, name) \
FOP_START(name) \
FOP1E(op, cl) \
FOP1E(op, cx) \
FOP1E(op, ecx) \
ON64(FOP1E(op, rcx)) \
FOP_END
#define FOP2E(op, dst, src) \
FOP_ALIGN #op " %" #src ", %" #dst " \n\t" FOP_RET
@ -996,6 +1005,9 @@ FASTOP2(xor);
FASTOP2(cmp);
FASTOP2(test);
FASTOP1SRC2(mul, mul_ex);
FASTOP1SRC2(imul, imul_ex);
FASTOP3WCL(shld);
FASTOP3WCL(shrd);
@ -2119,22 +2131,6 @@ static int em_jmp_far(struct x86_emulate_ctxt *ctxt)
return X86EMUL_CONTINUE;
}
static int em_mul_ex(struct x86_emulate_ctxt *ctxt)
{
u8 ex = 0;
emulate_1op_rax_rdx(ctxt, "mul", ex);
return X86EMUL_CONTINUE;
}
static int em_imul_ex(struct x86_emulate_ctxt *ctxt)
{
u8 ex = 0;
emulate_1op_rax_rdx(ctxt, "imul", ex);
return X86EMUL_CONTINUE;
}
static int em_div_ex(struct x86_emulate_ctxt *ctxt)
{
u8 de = 0;
@ -3736,8 +3732,8 @@ static const struct opcode group3[] = {
F(DstMem | SrcImm | NoWrite, em_test),
F(DstMem | SrcNone | Lock, em_not),
F(DstMem | SrcNone | Lock, em_neg),
I(DstXacc | Src2Mem, em_mul_ex),
I(DstXacc | Src2Mem, em_imul_ex),
F(DstXacc | Src2Mem, em_mul_ex),
F(DstXacc | Src2Mem, em_imul_ex),
I(DstXacc | Src2Mem, em_div_ex),
I(DstXacc | Src2Mem, em_idiv_ex),
};
@ -4572,7 +4568,8 @@ static void fetch_possible_mmx_operand(struct x86_emulate_ctxt *ctxt,
static int fastop(struct x86_emulate_ctxt *ctxt, void (*fop)(struct fastop *))
{
ulong flags = (ctxt->eflags & EFLAGS_MASK) | X86_EFLAGS_IF;
fop += __ffs(ctxt->dst.bytes) * FASTOP_SIZE;
if (!(ctxt->d & ByteOp))
fop += __ffs(ctxt->dst.bytes) * FASTOP_SIZE;
asm("push %[flags]; popf; call *%[fastop]; pushf; pop %[flags]\n"
: "+a"(ctxt->dst.val), "+d"(ctxt->src.val), [flags]"+D"(flags)
: "c"(ctxt->src2.val), [fastop]"S"(fop));