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Re: X32 psABI status

From: "H.J. Lu" <hjl dot tools at gmail dot com>
To: Florian Weimer <fw at deneb dot enyo dot de>
Cc: GCC Development <gcc at gcc dot gnu dot org>, GNU C Library <libc-alpha at sourceware dot org>, LKML <linux-kernel at vger dot kernel dot org>, x32-abi at googlegroups dot com
Date: Sat, 12 Feb 2011 13:29:00 -0800
Subject: Re: X32 psABI status
References: <AANLkTikgfv+L9WS4s6n5mQcXWTzc6YMNUSsgBiAOmKbE@mail.gmail.com><87aai1gdr7.fsf@mid.deneb.enyo.de>

On Sat, Feb 12, 2011 at 1:10 PM, Florian Weimer <fw@deneb.enyo.de> wrote:
> * H. J. Lu:
>
>> We made lots of progresses on x32 pABI:
>>
>> https://sites.google.com/site/x32abi/
>>
>> 1. Kernel interface with syscall is close to be finalized.
>> 2. GCC x32 branch is stabilizing.
>> 3. The Bionic C library works with the syscall kernel interface.
>>
>> The next major milestone will be x32 glibc port.
>
> It is a bit difficult to extract useful information from these
> resources.

That is true. Contributions are more than welcome.

> Is off_t 32 bits? ?Why is the ia32 compatiblity kernel interface used?

Yes.

> I'm sure a lot of people want to get rid of that in cases where they
> control the whole software stack.

That is debatable. The current thought is the x32 user space API
is the same as is ia32.  time_t is also an issue.

> Is stack alignment to 16 bytes beneficial for X32?
>

Even ia32 uses 16byte stack alignment and we will make it
official soon via an amendment to the i386 psABI.

-- 
H.J.

References:
- X32 psABI status
  - From: H.J. Lu
- Re: X32 psABI status
  - From: Florian Weimer

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