From: Ulrich Drepper <drepper@redhat.com>
To: Luca Barbieri <ldb@ldb.ods.org>
Cc: Linus Torvalds <torvalds@transmeta.com>,
Linux-Kernel ML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] Set TIF_IRET in more places
Date: Mon, 06 Jan 2003 10:42:11 -0800 [thread overview]
Message-ID: <3E19CE03.6090307@redhat.com> (raw)
In-Reply-To: <20030106181737.GA6867@ldb>
Luca Barbieri wrote:
> 1. vfork seems to not set any TIF_ flags so a ptracer setting regs
> while a vforking task is stopped in ptrace_notify called from vfork
> would result in clobbered %ecx and %edx.
Just to be clear: the vfork syscall does not use sysenter. It's not
possible with the current implementation. The magic sysenter wrapping
code would have to recognize the syscall and handle it special by saving
the return address. From glibc's POV the %edx register would be free
but I consider this interface far to fragile.
--
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next prev parent reply other threads:[~2003-01-06 18:33 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-01-06 14:46 [PATCH] Set TIF_IRET in more places Luca Barbieri
2003-01-06 16:04 ` Linus Torvalds
2003-01-06 18:17 ` Luca Barbieri
2003-01-06 18:42 ` Ulrich Drepper [this message]
2003-01-06 18:49 ` Linus Torvalds
2003-01-06 20:26 ` Luca Barbieri
-- strict thread matches above, loose matches on Subject: below --
2003-01-06 21:34 Zack Weinberg
2003-01-07 11:19 ` Jamie Lokier
2003-01-07 17:42 ` Linus Torvalds
2003-01-07 19:27 ` Zack Weinberg
2003-01-08 1:21 ` Richard Henderson
2003-01-08 2:33 ` Linus Torvalds
2003-01-08 3:32 ` Daniel Jacobowitz
2003-01-08 16:29 ` Jamie Lokier
2003-01-09 6:49 ` Zack Weinberg
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