Re: mmx instruction support on bohcs

>But if your program doesn't set CR0.EM, CR4.OSFXSR and CR0.TS properly -
it will raise exception.
>This is how the arch works.

I use the bochs from web source ,so how to set CR0.EM, CR4.OSFXSR ?

tks!





2013/4/25 Stanislav Shwartsman <[email protected]>

> Yes, everything is right. PXOR xmm, xmm is SSE2 instruction (and not MMX)
> but you have SSE2 enabled.
>
> But if your program doesn't set CR0.EM, CR4.OSFXSR and CR0.TS properly -
> it will raise exception.
> This is how the arch works.
> I'd suggest you to read exceptions information for PXOR instruction in
> Intel Software Developers manual.
>
> Stanislav
>
>
> On Thu, Apr 25, 2013 at 12:43 PM, Hatte John <[email protected]>wrote:
>
>> And I have find some useful clue for that.But I am not quite sure.
>>
>> at cpu/fetchdecode.cc :
>>   if (! BX_CPU_THIS_PTR sse_ok)
>>   {
>>      if (op_flags & BX_PREPARE_SSE)
>>  {
>>         if (i->execute != &BX_CPU_C::BxError) i->execute =
>> &BX_CPU_C::BxNoSSE;
>>         return(1);
>>      }
>>
>> sse_ok affect bochs's execution for pxor instr .
>>
>> And sse_ok is assigned according to some bits of cr0 and cr4.
>>
>> hope for guide .
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> 2013/4/25 Hatte John <[email protected]>
>>
>>> here is the output at the start of log file :
>>>
>>>  00000000000i[     ] System configuration
>>> 00000000000i[     ]   processors: 1 (cores=1, HT threads=1)
>>> 00000000000i[     ]   A20 line support: yes
>>> 00000000000i[     ] IPS is set to 4000000
>>> 00000000000i[     ] CPU configuration
>>> 00000000000i[     ]   level: 6
>>> 00000000000i[     ]   SMP support: no
>>> 00000000000i[     ]   APIC support: xapic
>>> 00000000000i[     ]   FPU support: yes
>>> 00000000000i[     ]   MMX support: yes
>>> 00000000000i[     ]   3dnow! support: no
>>> 00000000000i[     ]   SEP support: yes
>>> 00000000000i[     ]   SSE support: sse2
>>> 00000000000i[     ]   XSAVE support: no
>>> 00000000000i[     ]   AES support: no
>>> 00000000000i[     ]   MOVBE support: no
>>> 00000000000i[     ]   ADX support: no
>>> 00000000000i[     ]   x86-64 support: no
>>> 00000000000i[     ]   MWAIT support: yes
>>>
>>> My bochs halt at this :  0x40092587:  pxor   %xmm0,%xmm0 .
>>>
>>>
>>> Thanks!
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> 2013/4/25 Stanislav <[email protected]>
>>>
>>>> Not, enough. How about complete config?****
>>>>
>>>> What Bochs writes you in the log file when it starts ?****
>>>>
>>>> ** **
>>>>
>>>> >BTW,do you know some irc channel dedicated to bochs ?****
>>>>
>>>> ** **
>>>>
>>>> Probably there is old IRC channel but nobody is there ….****
>>>>
>>>> ** **
>>>>
>>>> Stanislav****
>>>>
>>>> ** **
>>>>
>>>> *From:* Hatte John [mailto:[email protected]]
>>>> *Sent:* Thursday, April 25, 2013 5:40 AM
>>>> *To:* Stanislav
>>>> *Cc:* [email protected]
>>>> *Subject:* Re: [Bochs-developers] mmx instruction support on bohcs****
>>>>
>>>> ** **
>>>>
>>>> thanks at first .****
>>>>
>>>> ** **
>>>>
>>>> here is my cpuid config set :cpuid: mmx =1,   sep=1  ,and my coulevel
>>>> is 6****
>>>>
>>>> ** **
>>>>
>>>> BTW,do you know some irc channel dedicated to bochs ?****
>>>>
>>>> ** **
>>>>
>>>> ** **
>>>>
>>>> ** **
>>>>
>>>> 2013/4/25 Stanislav <[email protected]>****
>>>>
>>>> You didn’t post your .bochsrc and configure options so nobody can guess
>>>> what are doing wrong …****
>>>>
>>>>  ****
>>>>
>>>> *From:* Hatte John [mailto:[email protected]]
>>>> *Sent:* Wednesday, April 24, 2013 6:52 PM
>>>> *To:* [email protected]
>>>> *Subject:* [Bochs-developers] mmx instruction support on bohcs****
>>>>
>>>>  ****
>>>>
>>>>    ****
>>>>
>>>>    My custom bochs can not recognize this inst:  pxor   %xmm0,%xmm0****
>>>>
>>>>    I think that is needed one config option set for cpuid in bochsrc
>>>> file .****
>>>>
>>>>    how can I write the config option?****
>>>>
>>>>   ****
>>>>
>>>>    I have write mmx=1 , but it can not exec that instrc .****
>>>>
>>>>    So I am confused . I am using 2.6 version .****
>>>>
>>>>  ****
>>>>
>>>>    Thanks in advance !****
>>>>
>>>> ** **
>>>>
>>>
>>>
>>
>

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