From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Jan Kiszka <jan.kiszka@domain.hid>
Cc: Petr Cervenka <grugh@domain.hid>, xenomai-core <xenomai@xenomai.org>
Subject: Re: [Xenomai-core] [PATCH 2/3] x86-64: Work around gcc issues with populating syscall registers
Date: Sun, 19 Jul 2009 17:12:24 +0200 [thread overview]
Message-ID: <4A6337D8.7030300@domain.hid> (raw)
In-Reply-To: <4A62D2B8.8030907@domain.hid>
Jan Kiszka wrote:
> gcc-4.1.3 of kubuntu has problem with proper syscall register
> initialization in rt_task_shadow if TLS is enabled. But it is likely
> that more compiler versions below 4.3 and more configuration variants
> are affected.
>
> This patch installs a workaround for these gcc versions which places an
> optimization barrier before the register variable setup. This forces gcc
> to actually load the registers.
I have tried the barrier with arm gcc, it does not work. However,
marking the registered clobbered instead of the memory fixes arm gcc 4.3
bug. So, I wonder, would not it make more sense to mark the registers as
clobbered by the barrier instead of memory on x86 too?
--
Gilles.
next prev parent reply other threads:[~2009-07-19 15:12 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <4A62D1C1.9050807@domain.hid>
2009-07-19 8:00 ` [Xenomai-core] [PATCH 1/3] native: Align documentation to code Jan Kiszka
2009-07-19 8:00 ` [Xenomai-core] [PATCH 2/3] x86-64: Work around gcc issues with populating syscall registers Jan Kiszka
2009-07-19 13:42 ` Gilles Chanteperdrix
2009-07-19 14:31 ` Philippe Gerum
2009-07-19 15:12 ` Gilles Chanteperdrix [this message]
2009-07-19 15:23 ` Jan Kiszka
2009-07-19 15:35 ` Philippe Gerum
2009-07-20 6:37 ` Jan Kiszka
2009-07-19 8:01 ` [Xenomai-core] [PATCH 3/3] x86: Merge syscall_{32|64}.h into syscall.h Jan Kiszka
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