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Re: [PATCH 3/4] Consolidate pread/pread64 implementations

On 04-01-2016 22:53, Mike Frysinger wrote:
> On 04 Jan 2016 10:42, Adhemerval Zanella wrote:
>> On 29-12-2015 15:28, Mike Frysinger wrote:
>>> On 18 Nov 2015 12:02, Adhemerval Zanella wrote:
>>>> This patch consolidates all the pread/pread64 implementation for Linux
>>>> in only one (sysdeps/unix/sysv/linux/pread.c).  It also removes the
>>>> syscall from the auto-generation using assembly macros.
>>>> For pread{64} offset argument placement the new SYSCALL_LL{64} macro
>>>> is used.  For pread ports that do not define __NR_pread will use
>>>> __NR_pread64 and for pread64 ports that dot define __NR_pread64 will
>>>> use __NR_pread for the syscall.
>>> pretty sure you just broke sh here.  while it doesn't have the 64-bit
>>> arg alignment issue, it has a wart where it copied the kernel interface
>>> of one.  you can see it in the files you deleted:
>> Indeed, my understanding is SH also requires __ASSUME_ALIGNED_REGISTER_PAIRS.
>> I will change it for the 1/4 patch part.
> just to be clear, SuperH (the ABI) does not have these 64-bit register
> pair requirements like ARM/EABI.  its syscall ABI for pread64/pwrite64
> has legacy cruft where there's a dummy reg before the 64-bit value.  so
> you can (and want) to use the same logic just for these two syscalls as
> the result happens to look the same.
> -mike

Right, so for SuperH kernel interface the 64-bit pair cruft is only for
pread64/pwrite64 or is it for all 64-bits arguments?

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