From: "H. Peter Anvin" <hpa@zytor.com>
To: Jan Hubicka <hubicka@ucw.cz>
Cc: Joe Buck <Joe.Buck@synopsys.COM>, Michael Matz <matz@suse.de>,
Aurelien Jarno <aurelien@aurel32.net>,
linux-kernel@vger.kernel.org, gcc@gcc.gnu.org
Subject: Re: Linux doesn't follow x86/x86-64 ABI wrt direction flag
Date: Wed, 05 Mar 2008 13:07:52 -0800 [thread overview]
Message-ID: <47CF0BA8.8040204@zytor.com> (raw)
In-Reply-To: <20080305204945.GB14011@atrey.karlin.mff.cuni.cz>
Jan Hubicka wrote:
>> Yes, if there are four kernels that get it "wrong", that effectively means
>> that the ABI document doesn't describe reality and gcc has to adjust.
>
> Kernels almost never follow ABI used by applications to last detail.
> Linux kernel is disabling red zone and use kernel code model, yet the
> ABI is not going to be adjusted for that.
>
> This is resonably easy to fix on kernel side in signal handling, or by
> removing std usage completely (I believe it is not performance win, but
> some benchmarking would be needed to double check)
That's not the issue. The issue is that the kernel leaks the DF from
the code that took a signal to the signal handler.
-hpa
next prev parent reply other threads:[~2008-03-05 21:12 UTC|newest]
Thread overview: 98+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-05 15:30 Linux doesn't follow x86/x86-64 ABI wrt direction flag Aurelien Jarno
2008-03-05 16:00 ` H. Peter Anvin
2008-03-05 19:58 ` Joe Buck
2008-03-05 20:23 ` Aurelien Jarno
2008-03-05 20:38 ` Michael Matz
2008-03-05 20:42 ` Joe Buck
2008-03-05 20:49 ` Jan Hubicka
2008-03-05 21:02 ` Michael Matz
2008-03-05 21:20 ` RELEASE BLOCKER: " Joe Buck
2008-03-05 21:32 ` Richard Guenther
2008-03-05 21:34 ` H. Peter Anvin
2008-03-05 21:40 ` Richard Guenther
2008-03-05 22:16 ` David Miller
2008-03-05 22:37 ` Joe Buck
2008-03-05 22:51 ` Michael Matz
2008-03-05 22:58 ` H. Peter Anvin
2008-03-05 23:07 ` Michael Matz
2008-03-05 23:10 ` David Miller
2008-03-05 23:16 ` Joe Buck
2008-03-05 23:12 ` Olivier Galibert
2008-03-05 21:43 ` Joe Buck
2008-03-05 21:44 ` Richard Guenther
[not found] ` <738B72DB-A1D6-43F8-813A-E49688D05771@apple.com>
2008-03-05 21:59 ` Michael Matz
2008-03-05 22:13 ` Adrian Bunk
2008-03-05 22:21 ` David Miller
2008-03-05 23:13 ` Olivier Galibert
2008-03-06 0:36 ` Chris Lattner
2008-03-06 0:47 ` H. Peter Anvin
[not found] ` <578FCA7D-D7A6-44F6-9310-4A97C13CDCBE@apple.com>
2008-03-06 1:12 ` H. Peter Anvin
2008-03-06 9:17 ` Jakub Jelinek
2008-03-06 13:51 ` Olivier Galibert
2008-03-06 14:03 ` Paolo Bonzini
2008-03-06 14:12 ` Olivier Galibert
2008-03-06 14:15 ` Andrew Haley
2008-03-06 17:58 ` Joe Buck
2008-03-06 18:10 ` Olivier Galibert
2008-03-06 18:13 ` Paolo Bonzini
2008-03-06 18:31 ` Jack Lloyd
2008-03-06 18:35 ` Andrew Pinski
2008-03-06 19:44 ` Paolo Bonzini
2008-03-06 19:43 ` Paolo Bonzini
2008-03-06 20:16 ` Jack Lloyd
2008-03-06 21:37 ` Artur Skawina
2008-03-06 15:09 ` Robert Dewar
2008-03-06 15:37 ` NightStrike
2008-03-06 15:43 ` H.J. Lu
2008-03-06 15:50 ` H. Peter Anvin
2008-03-06 16:23 ` Jakub Jelinek
2008-03-06 16:27 ` İsmail Dönmez
2008-03-06 16:58 ` H.J. Lu
2008-03-06 17:06 ` H. Peter Anvin
2008-03-06 17:14 ` H.J. Lu
2008-03-06 17:17 ` H. Peter Anvin
2008-03-06 17:34 ` H.J. Lu
2008-03-06 19:35 ` Robert Dewar
2008-03-06 17:18 ` Robert Dewar
2008-03-06 17:19 ` H. Peter Anvin
2008-03-06 19:25 ` Robert Dewar
2008-03-06 20:37 ` H. Peter Anvin
2008-03-07 8:28 ` Florian Weimer
2008-03-07 8:00 ` Andreas Jaeger
2008-03-06 15:57 ` Robert Dewar
2008-03-06 16:29 ` Paolo Bonzini
2008-03-06 17:18 ` H. Peter Anvin
2008-03-06 16:14 ` Artur Skawina
2008-03-06 0:49 ` Aurelien Jarno
2008-03-05 22:05 ` H. Peter Anvin
2008-03-06 2:11 ` Krzysztof Halasa
2008-03-06 8:44 ` Andi Kleen
2008-03-06 9:01 ` Jakub Jelinek
2008-03-06 15:20 ` H. Peter Anvin
2008-03-05 21:45 ` Aurelien Jarno
2008-03-05 21:43 ` Andrew Pinski
2008-03-05 21:43 ` Michael Matz
2008-03-05 22:12 ` Joe Buck
2008-03-05 22:17 ` David Miller
2008-03-05 23:17 ` Olivier Galibert
2008-03-05 23:21 ` David Daney
2008-03-06 14:06 ` Olivier Galibert
2008-03-08 19:10 ` Alexandre Oliva
2008-03-05 21:07 ` H. Peter Anvin [this message]
2008-03-05 20:44 ` H. Peter Anvin
2008-03-05 20:52 ` Aurelien Jarno
2008-03-05 21:23 ` David Miller
2008-03-06 9:53 ` Andrew Haley
2008-03-06 11:45 ` Andi Kleen
2008-03-06 12:06 ` Richard Guenther
2008-03-06 17:34 ` Joe Buck
2008-03-06 20:54 ` Richard Guenther
2008-03-06 20:56 ` H. Peter Anvin
2008-03-06 22:06 ` Andi Kleen
2008-03-07 4:56 ` Chris Lattner
2008-03-07 14:09 ` Michael Matz
2008-03-06 9:45 ` Mikael Pettersson
2008-03-05 16:56 ` H.J. Lu
2008-03-05 18:14 ` [PATCH] x86: Clear DF before calling signal handler Aurelien Jarno
2008-03-05 18:17 ` H. Peter Anvin
2008-03-06 9:21 ` Ingo Molnar
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