From: Pavel Machek <pavel@ucw.cz>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: kernel list <linux-kernel@vger.kernel.org>,
linuxppc-dev@ozlabs.org, paulus@samba.org
Subject: Re: register long sp asm("r1") incorrect
Date: Thu, 18 Feb 2010 23:57:11 +0100 [thread overview]
Message-ID: <20100218225711.GA1386@ucw.cz> (raw)
In-Reply-To: <4B79C775.1050903@zytor.com>
On Mon 2010-02-15 14:15:17, H. Peter Anvin wrote:
> On 02/15/2010 01:04 PM, Benjamin Herrenschmidt wrote:
> >
> > It's true that most other use of it we have are global scope (local_paca
> > in r13, glibc use of r2/r13, etc...) afaik, but since r1 itself is the
> > stack pointer always, I think they pretty much guarantee it works.
> >
>
> It should work, because r1, being the stack pointer, is already marked a
> reserved register in gcc.
>
> The reference Pavel is citing bascially states that gcc won't globally
> reserve the register, which is true, but it is already reserved anyway.
Ok, thanks for clarification.
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
prev parent reply other threads:[~2010-02-19 19:36 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-09 15:24 register long sp asm("r1") incorrect Pavel Machek
2010-02-11 5:31 ` Benjamin Herrenschmidt
2010-02-15 7:34 ` Pavel Machek
2010-02-15 19:59 ` Benjamin Herrenschmidt
2010-02-15 20:28 ` Pavel Machek
2010-02-15 21:04 ` Benjamin Herrenschmidt
2010-02-15 22:15 ` H. Peter Anvin
2010-02-18 22:57 ` Pavel Machek [this message]
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