Re: [Qemu-devel] mipsIV support for mips-linux-user

[Aurelien Jarno]

On Sun, Mar 29, 2009 at 10:14:23PM -0400, Vince Weaver wrote:
> On Mon, 30 Mar 2009, Aurelien Jarno wrote:
>
>> On Sun, Mar 29, 2009 at 04:56:35PM -0400, Vince Weaver wrote:
>>> Hello
>>>
>>> I have some 32-bit mips binaries compiled with -mips4 -O3.
>>>
>>> These run fine on an actual mips r12k system I have, but fail with
>>> default mips-linux-user (0.10.1).
>>>
>>> This is because by default mips-linux-user does not have support enabled
>>> for mipsIV instructions.  This is because MIPS_HFLAG_COP1X
>>> is not enabled on any of the cpus supported by mips-linux-user.
>>>
>>> So my question, what is the correct way to fix this?  Add a R4000 class
>>> CPU that can be seen with mips-linux-user?  Or should the default for
>>> user operation just enable this because it supports more binaries?
>>
>> Did you try with a MIPS32R2 CPU? It should have COP1X instructions.
>
> I tried all of the variants listed with -cpu ?
>
> no -cpu specified = fails at first cop1x insn
>
> MIPS '4Kc'      = segfaults invalid "cfc1    v1,$31" instruction
> MIPS '4Km'      = segfaults invalid "cfc1    v1,$31" instruction
> MIPS '4KEcR1'     = segfaults invalid "cfc1    v1,$31" instruction
> MIPS '4KEmR1'     = segfaults invalid "cfc1    v1,$31" instruction
> MIPS '4KEc'       = segfaults invalid "cfc1    v1,$31" instruction
> MIPS '4KEm'       = segfaults invalid "cfc1    v1,$31" instruction
> MIPS '24Kc'       = segfaults invalid "cfc1    v1,$31" instruction
> MIPS '24Kf'       = fails at first cop1x insn
> MIPS '34Kf'       = fails at first cop1x insn
>
> If I modify the check for cop1x to always return valid, running with no  
> -cpu runs the program successfully to completion.
>
> This might be some mistake in the cpu feature selection logic.  The code  
> is a bit hard to follow, especially as I don't have a good document  
> specifying which CPUs have which features, especially since the real  
> machines I have access to for comparison are SGI R4600, R5000 and R12000
> machines.
>

Do you have the end of qemu.log when running your code with -d in_asm,op?

-- 
Aurelien Jarno                          GPG: 1024D/F1BCDB73
address@hidden                 http://www.aurel32.net