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