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

From: Richard Henderson
Subject: Re: [Qemu-devel] [PATCH 3/3] linux-user:Signal handling for MIPS64
Date: Wed, 14 Dec 2011 08:20:30 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:8.0) Gecko/20111115 Thunderbird/8.0

On 12/07/2011 09:25 PM, address@hidden 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.

>  #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.


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