From: Jakub Jelinek <jakub@redhat.com>
To: davidm@hpl.hp.com
Cc: Andreas Schwab <schwab@suse.de>,
Ulrich Drepper <drepper@redhat.com>,
Glibc hackers <libc-hacker@sources.redhat.com>
Subject: Re: [PATCH] getpid/vfork/raise fix
Date: Wed, 10 Mar 2004 17:02:00 -0000 [thread overview]
Message-ID: <20040310145052.GX3822@sunsite.ms.mff.cuni.cz> (raw)
In-Reply-To: <16463.17524.280448.143159@napali.hpl.hp.com>
On Wed, Mar 10, 2004 at 08:38:12AM -0800, David Mosberger wrote:
> >>>>> On Wed, 10 Mar 2004 15:33:05 +0100, Andreas Schwab <schwab@suse.de> said:
>
> Andreas> That doesn't seem to work, though. I'm getting p3 != p4 in
> Andreas> the posix vfork tests. Or do you see any error in my
> Andreas> implementation?
>
> Most scratch registers are _not_ preserved across system calls. You
> could spill the register onto the memory stack though. If it uses at
> most 16 bytes, you won't have to adjust the stack pointer even.
But as soon as you spill something into memory the vfork child can clobber
it and you restore in the parent something different from what you saved.
Jakub
next prev parent reply other threads:[~2004-03-10 17:02 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-07 23:18 getpid/vfork broken Andreas Schwab
2004-03-07 23:30 ` Ulrich Drepper
2004-03-08 2:22 ` Roland McGrath
2004-03-08 2:28 ` Ulrich Drepper
2004-03-08 2:37 ` Roland McGrath
2004-03-08 13:10 ` Jakub Jelinek
2004-03-09 1:28 ` Roland McGrath
2004-03-09 2:04 ` Ulrich Drepper
2004-03-09 3:50 ` Richard Henderson
2004-03-09 7:48 ` Ulrich Drepper
2004-03-09 13:01 ` Andreas Schwab
2004-03-09 13:59 ` [PATCH] getpid/vfork/raise fix Jakub Jelinek
2004-03-09 16:44 ` Andreas Schwab
2004-03-09 19:38 ` Jakub Jelinek
2004-03-10 5:53 ` Ulrich Drepper
2004-03-10 10:37 ` Andreas Schwab
2004-03-10 12:24 ` Jakub Jelinek
2004-03-10 14:33 ` Andreas Schwab
2004-03-10 15:01 ` Jakub Jelinek
2004-03-10 15:06 ` Andreas Schwab
2004-03-10 16:56 ` David Mosberger
2004-03-10 17:02 ` Jakub Jelinek [this message]
2004-03-10 17:45 ` David Mosberger
2004-03-10 18:19 ` Jakub Jelinek
2004-03-10 19:24 ` David Mosberger
2004-03-10 18:44 ` Ulrich Drepper
2004-03-10 19:18 ` [PATCH] IA-64 pt-vfork fix Jakub Jelinek
2004-03-10 23:10 ` Ulrich Drepper
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