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Re: [RFC] x32 and syscall consolidation

From: Adhemerval Zanella <adhemerval dot zanella at linaro dot org>
To: Joseph Myers <joseph at codesourcery dot com>
Cc: GNU C Library <libc-alpha at sourceware dot org>
Date: Wed, 20 Jul 2016 17:50:52 -0300
Subject: Re: [RFC] x32 and syscall consolidation
Authentication-results: sourceware.org; auth=none
References: <5784BAB3.5020406@linaro.org> <alpine.DEB.2.20.1607201703410.12251@digraph.polyomino.org.uk>


On 20/07/2016 14:06, Joseph Myers wrote:
> On Tue, 12 Jul 2016, Adhemerval Zanella wrote:
> 
>> However I would also like to enable {INTERNAL,INLINE}_SYSCALL 
>> to work correctly with 64-bits arguments on x32 and potentially
>> on any ILP32 ports.  The C binding macros currently throw warnings
>> if one try to cast a ILP32 pointer to 64 bit register argument,
>> so I am not really sure how to cleanup this kind of code.
> 
> Well, we have sysdeps/unix/sysv/linux/mips/mips64/n32/sysdep.h first 
> casting to (__typeof__ ((X) - (X))).  There may be other approaches as 
> well (depending on whether you want sign or zero extension of pointers).
> 

Thanks for the points, it seems a good alternative.  I will resume the
work on this for 2.25.

References:
- [RFC] x32 and syscall consolidation
  - From: Adhemerval Zanella
- Re: [RFC] x32 and syscall consolidation
  - From: Joseph Myers

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