From: "Steven J. Magnani" <steve@digidescorp.com>
To: microblaze-uclinux@itee.uq.edu.au
Cc: linux-kernel@vger.kernel.org, monstr@monstr.eu
Subject: RE: [microblaze-uclinux] [PATCH v2] microblaze: nommu: Don't clobber R11 on syscalls
Date: Mon, 14 Dec 2009 22:41:28 -0600 [thread overview]
Message-ID: <1260852089.3541.5.camel@iscandar.digidescorp.com> (raw)
In-Reply-To: <005801ca7d0f$deaef5b0$9c0ce110$@com>
On Mon, 2009-12-14 at 14:50 -0800, Jim Van Vorst wrote:
> Isn't R11 a temporary? If it doesn't need to be preserved across function
> calls, why can't it be clobbered during a syscall?
Because the Microblaze syscall macros don't include r11 in the clobber
list. I suppose an alternative solution would just change the userspace
macros and not the kernel, even though there is a bug in the kernel.
Michal, is the Microblaze ABI considered "locked down" now, or is a
kernel solution still permitted?
------------------------------------------------------------------------
Steven J. Magnani "I claim this network for MARS!
www.digidescorp.com Earthling, return my space modulator!"
#include <standard.disclaimer>
next prev parent reply other threads:[~2009-12-15 4:41 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-14 22:24 [PATCH v2] microblaze: nommu: Don't clobber R11 on syscalls steve
[not found] ` <005801ca7d0f$deaef5b0$9c0ce110$@com>
2009-12-15 4:41 ` Steven J. Magnani [this message]
2009-12-15 7:24 ` Michal Simek
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