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Re: [x86-64 psABI] RFC: Extend x86-64 psABI to support x32
- From: "H.J. Lu" <hjl dot tools at gmail dot com>
- To: x32-abi at googlegroups dot com
- Cc: discuss at x86-64 dot org, GCC Development <gcc at gcc dot gnu dot org>, Binutils <binutils at sourceware dot org>, GNU C Library <libc-alpha at sourceware dot org>, GDB <gdb at sourceware dot org>
- Date: Tue, 26 Jun 2012 12:47:50 -0700
- Subject: Re: [x86-64 psABI] RFC: Extend x86-64 psABI to support x32
- References: <CAMe9rOqE84CeCEZHxahccP2obgb50zdJWuY0z3UzWnDYn=g_4A@mail.gmail.com> <ccd4a6ab-f279-477f-b48b-94b8f4afd37d@googlegroups.com>
On Tue, Jun 26, 2012 at 12:36 PM, Mark Butler <butlerm@middle.net> wrote:
> On Monday, May 14, 2012 11:31:11 AM UTC-6, H.J. wrote:
>>
>> Support for the x32 psABI:
>>
>> http://sites.google.com/site/x32abi/
>>
>> is added in Linux kernel 3.4-rc1. ?X32 uses the ILP32 model for x86-64
>> instruction set with size of long and pointers == 4 bytes. ?X32 is
>> already supported in GCC 4.7.0 and binutils 2.22...Here is a
>> patch to extend x86-64 psABI for x32. ?Any comments?
>>
>
> May I ask why the decision was made to use ILP32 instead of L64P32? ? The
> latter would seem to avoid lots of porting problems in particular. ?And if
> porting difficulties are the major complained about x32, is it really too
> late to switch? ?Thanks - mdb
x32 is designed to replace ia32 where long is 32-bit, not x86-64.
--
H.J.