Re: [Qemu-devel] [PATCH 3/3] linux-user:Signal handling for MIPS64

[Khansa Butt <khansa@kics.edu.pk>]

On Wed, Dec 14, 2011 at 9:20 PM, Richard Henderson <rth@twiddle.net> wrote:
> On 12/07/2011 09:25 PM, khansa@kics.edu.pk wrote:
>> +#if defined(TARGET_MIPS64)
>> +        /* tswapal() do 64 bit swap in case of MIPS64 but
>> +           we need 32 bit swap as sa_flags is 32 bit */
>> +        k->sa_flags = bswap32(act->sa_flags);
>> +#else
>>          k->sa_flags = tswapal(act->sa_flags);
>> +#endif
>
> The condition in syscall_defs.h is TARGET_MIPS, not TARGET_MIPS64.
> They should match, despite the fact that it doesn't actually matter
> for the 32-bit abis.
>

actually sa_flags is 32 bit for MIPS64 but tswapal calls tswap64() as
TARGET_LONG_SIZE != 4
in case of MIPS64( see cpu-all.h) hence sa_flags has wrong value at
the end so I used above hunk

>>  #elif defined(TARGET_ABI_MIPSN64)
>>
>> -# warning signal handling not implemented
>> +struct target_sigcontext {
>> +    uint32_t   sc_regmask;     /* Unused */
>> +    uint32_t   sc_status;
>
> There's no reason to duplicate all this code.  Yes, when someone wrote
> this in the first place, they wrote separate sectons for each mips abi.
> However, as you can see that huge portions of this block are identical,
> this was obviously a mistake.
>
> Start by changing the original section to #elif defined(TARGET_MIPS)
> and see what needs changing specifically for the ABIs.  I'm not even
> sure there are any differences at all.
>
>
> r~