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KVM: x86 emulator: convert group 3 instructions to direct decode

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Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Avi Kivity 2011-09-13 10:45:39 +03:00
parent cc0793968a
commit 3329ece161
1 changed files with 48 additions and 34 deletions
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82
arch/x86/kvm/emulate.c
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@ -1663,37 +1663,49 @@ static int em_grp2(struct x86_emulate_ctxt *ctxt)
return X86EMUL_CONTINUE;
}
static int em_grp3(struct x86_emulate_ctxt *ctxt)
static int em_not(struct x86_emulate_ctxt *ctxt)
{
ctxt->dst.val = ~ctxt->dst.val;
return X86EMUL_CONTINUE;
}
static int em_neg(struct x86_emulate_ctxt *ctxt)
{
emulate_1op(ctxt, "neg");
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;
switch (ctxt->modrm_reg) {
case 0 ... 1: /* test */
emulate_2op_SrcV(ctxt, "test");
/* Disable writeback. */
ctxt->dst.type = OP_NONE;
break;
case 2: /* not */
ctxt->dst.val = ~ctxt->dst.val;
break;
case 3: /* neg */
emulate_1op(ctxt, "neg");
break;
case 4: /* mul */
emulate_1op_rax_rdx(ctxt, "mul", de);
break;
case 5: /* imul */
emulate_1op_rax_rdx(ctxt, "imul", de);
break;
case 6: /* div */
emulate_1op_rax_rdx(ctxt, "div", de);
break;
case 7: /* idiv */
emulate_1op_rax_rdx(ctxt, "idiv", de);
break;
default:
return X86EMUL_UNHANDLEABLE;
}
emulate_1op_rax_rdx(ctxt, "div", de);
if (de)
return emulate_de(ctxt);
return X86EMUL_CONTINUE;
}
static int em_idiv_ex(struct x86_emulate_ctxt *ctxt)
{
u8 de = 0;
emulate_1op_rax_rdx(ctxt, "idiv", de);
if (de)
return emulate_de(ctxt);
return X86EMUL_CONTINUE;
@ -2989,9 +3001,14 @@ static struct opcode group1A[] = {
};
static struct opcode group3[] = {
D(DstMem | SrcImm | ModRM), D(DstMem | SrcImm | ModRM),
D(DstMem | SrcNone | ModRM | Lock), D(DstMem | SrcNone | ModRM | Lock),
X4(D(SrcMem | ModRM)),
I(DstMem | SrcImm | ModRM, em_test),
I(DstMem | SrcImm | ModRM, em_test),
I(DstMem | SrcNone | ModRM | Lock, em_not),
I(DstMem | SrcNone | ModRM | Lock, em_neg),
I(SrcMem | ModRM, em_mul_ex),
I(SrcMem | ModRM, em_imul_ex),
I(SrcMem | ModRM, em_div_ex),
I(SrcMem | ModRM, em_idiv_ex),
};
static struct opcode group4[] = {
@ -3917,9 +3934,6 @@ int x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
/* complement carry flag from eflags reg */
ctxt->eflags ^= EFLG_CF;
break;
case 0xf6 ... 0xf7: /* Grp3 */
rc = em_grp3(ctxt);
break;
case 0xf8: /* clc */
ctxt->eflags &= ~EFLG_CF;
break;