Re: [Qemu-devel] [PATCH] Target-arm: Add the Cortex-M4 CPU

[aurelio remonda <aurelioremonda@gmail.com>]

>>              if (op < 4) {
>>                  /* Saturating add/subtract.  */
>> +                if (!(arm_dc_feature(s, ARM_FEATURE_THUMB_DSP))){
>> +                    /* qsub, qadd, qdadd, qdsub are DSP instructions. */
>> +                    goto illegal_op;
>> +                }
>>                  tmp = load_reg(s, rn);
>>                  tmp2 = load_reg(s, rm);
>>                  if (op & 1)
>> @@ -9559,6 +9598,12 @@ static int disas_thumb2_insn(CPUARMState *env, DisasContext *s, uint16_t insn_hw
>>                      gen_revsh(tmp);
>>                      break;
>>                  case 0x10: /* sel */
>> +                    if (!(arm_dc_feature(s, ARM_FEATURE_THUMB_DSP))){
>> +                    /* sel is a DSP instruction. */
>> +                    /* need to free this so there's no TCG temporary leak */
>> +                    tcg_temp_free_i32(tmp);
>> +                    goto illegal_op;
>> +                    }
>>                      tmp2 = load_reg(s, rm);
>>                      tmp3 = tcg_temp_new_i32();
>>                      tcg_gen_ld_i32(tmp3, cpu_env, offsetof(CPUARMState, GE));
>> @@ -9624,6 +9669,15 @@ static int disas_thumb2_insn(CPUARMState *env, DisasContext *s, uint16_t insn_hw
>>                  }
>>                  break;
>>              case 1: /* 16 x 16 -> 32 */
>> +                if (!(arm_dc_feature(s, ARM_FEATURE_THUMB_DSP))){
>> +                    /* smlabb, smlabt, smlatb, smlatt, smulbb, smulbt, smultt
>> +                     * and smultb are DSP instructions
>> +                     */
>> +                     /* need to free this so there's no TCG temporary leak */
>
> Comment un-needed.

Why do you think it's not needed? Any comments are helpful as long as
they're correct. Thanks