[prev in list] [next in list] [prev in thread] [next in thread] 

List:       bochs-dev
Subject:    Re: [Bochs-developers] mmx instruction support on bohcs
From:       Hatte John <june.tune.sea () gmail ! com>
Date:       2013-08-12 15:40:56
Message-ID: CAOo4JD=ZSQQh=EY74t5y2-452k3o_aTtf1FgKuMJu4k6L5dVww () mail ! gmail ! com
[Download RAW message or body]

Do you mean my program does not match the bochs configuration ?

I have not set CR0 and CR4 to accurate state , which is needed by
bochs , so  exception happened .

Am I right?

Thanks!

2013/4/25 Stanislav Shwartsman <stlintel@gmail.com>:
> 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 <june.tune.sea@gmail.com>
> 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 <june.tune.sea@gmail.com>
>>>
>>> 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 <stlintel@gmail.com>
>>>>
>>>> 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:june.tune.sea@gmail.com]
>>>> Sent: Thursday, April 25, 2013 5:40 AM
>>>> To: Stanislav
>>>> Cc: bochs-developers@lists.sourceforge.net
>>>> 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 <stlintel@gmail.com>
>>>>
>>>> You didn’t post your .bochsrc and configure options so nobody can guess
>>>> what are doing wrong …
>>>>
>>>>
>>>>
>>>> From: Hatte John [mailto:june.tune.sea@gmail.com]
>>>> Sent: Wednesday, April 24, 2013 6:52 PM
>>>> To: bochs-developers@lists.sourceforge.net
>>>> 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 !
>>>>
>>>>
>>>
>>>
>>
>

------------------------------------------------------------------------------
Get 100% visibility into Java/.NET code with AppDynamics Lite!
It's a free troubleshooting tool designed for production.
Get down to code-level detail for bottlenecks, with <2% overhead. 
Download for free and get started troubleshooting in minutes. 
http://pubads.g.doubleclick.net/gampad/clk?id=48897031&iu=/4140/ostg.clktrk
_______________________________________________
bochs-developers mailing list
bochs-developers@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/bochs-developers
[prev in list] [next in list] [prev in thread] [next in thread]