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Date: Tue, 26 Jun 2012 21:23:00 -0000
Message-ID: <CAMe9rOpw=BczUuJrJxzE_JnnXe9br3H+-O+P4=u0Ce1Hs7KcAg@mail.gmail.com>
Subject: Re: [x86-64 psABI] RFC: Extend x86-64 psABI to support x32
From: "H.J. Lu" <hjl.tools@gmail.com>
To: x32-abi@googlegroups.com
Cc: discuss@x86-64.org, GCC Development <gcc@gcc.gnu.org>, Binutils <binutils@sourceware.org>, 	GNU C Library <libc-alpha@sourceware.org>, GDB <gdb@sourceware.org>
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On Tue, Jun 26, 2012 at 2:11 PM, Mark Butler <butlerm@middle.net> wrote:
>
>> x32 is designed to replace ia32 where long is 32-bit, not x86-64.
>>
> I understand, but wouldn't L64P32 be much better in the long run? In terms
> of compatibility with LP64, and an LP64 kernel in particular? =A0The stru=
cture
> layouts of any structure that did not contain pointers would be identical,
> for example. =A0struct timeval, struct timespec, struct stat, and on and =
on...

Linux/x32 uses the same layout for struct timeval, struct timespec, struct =
stat,
as Linux/x86-64. It is orthogonal to L64 vs L32.

--=20
H.J.