linux-kernel - Re: X32 psABI status

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Date:	Sun, 13 Feb 2011 08:48:57 -0800
From:	"H.J. Lu" <hjl.tools@...il.com>
To:	Petr Baudis <pasky@...e.cz>
Cc:	Florian Weimer <fw@...eb.enyo.de>, x32-abi@...glegroups.com,
	GCC Development <gcc@....gnu.org>,
	GNU C Library <libc-alpha@...rceware.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: X32 psABI status

2011/2/13 Petr Baudis <pasky@...e.cz>:
> On Sun, Feb 13, 2011 at 07:13:57AM -0800, H.J. Lu wrote:
>> On Sun, Feb 13, 2011 at 7:07 AM, Florian Weimer <fw@...eb.enyo.de> wrote:
>> > * H. J. Lu:
>> >
>> >>> Actually, I'm wondering if you can do the translation in user space.
>> >>> There already are 32-on-64 implementations in existence, without
>> >>> kernel changes (recent Hotspot, LuaJIT, and probably some more).
>> >>
>> >> Please check out the x32 kernel source and provide feedback.
>> >
>> > I still don't understand why you need a separate syscall table.  You
>> > should really be able to run on an unmodified amd64 kernel, in 64 bit
>>
>> That is done on purpose. x32 is designed for environments where the
>> current ia32 API is sufficient. You can think it as ia32 with register
>> extended to 64bit plus 8 more registers. Everything else is still 32bit.
>
> I think it would be great if you could add some text like this plus some
> rationale (AIUI, this is geared mainly at new Atoms and other x86_64
> embedded platforms) to the document.

I updated:

https://sites.google.com/site/x32abi/

> (BTW, it is not really convincing to me that such a niche is worth all
> the trouble this is going to bring.)
>

That is a good question.  Otherwise x32 would have been implemented
long time ago.


-- 
H.J.
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