From: compudj@krystal.dyndns.org (Mathieu Desnoyers)
Subject: [ltt-dev] [PATCH 04/11] define sync_core for x86 PIC
Date: Mon, 15 Feb 2010 09:56:30 -0500 [thread overview]
Message-ID: <20100215145630.GD13436@Krystal> (raw)
In-Reply-To: <4B790166.70901@redhat.com>
* Paolo Bonzini (pbonzini at redhat.com) wrote:
> On 02/14/2010 03:37 PM, Mathieu Desnoyers wrote:
>> Please add a note saying that it also works in the presence of signal
>> handlers, because we are not using the ebx value returned by cpuid.
>>
>> It would not be correct to use this with signals enabled if we cared
>> about the ebx value returned by cpuid.
>
> It would, because %ebx is callee-save and the signal handler would have
> to reinitialize it (since each shared library for example has its own
> GOT, it doesn't know if the caller had the same GOT). In general,
> functions that are not static or hidden, or that have their address
> taken need to rebuild the GOT pointer. Signal handlers fall obviously
> in the latter category.
OK, that makes perfect sense. Thanks for the explanation. It could be
good to add a few words explaining this in your patch.
Mathieu
>
> Paolo
>
--
Mathieu Desnoyers
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next prev parent reply other threads:[~2010-02-15 14:56 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-13 17:16 [ltt-dev] [PATCH 00/11] Simplify system dependent URCU code Paolo Bonzini
2010-02-13 17:16 ` [ltt-dev] [PATCH 01/11] use kernel style makefile output Paolo Bonzini
2010-02-14 14:25 ` Mathieu Desnoyers
2010-02-13 17:16 ` [ltt-dev] [PATCH 02/11] use autoconf symbolic linking Paolo Bonzini
2010-02-14 14:25 ` Mathieu Desnoyers
2010-02-13 17:16 ` [ltt-dev] [PATCH 03/11] add urcu/arch_defaults.h Paolo Bonzini
2010-02-14 14:34 ` Mathieu Desnoyers
2010-02-15 7:53 ` Paolo Bonzini
2010-02-15 14:46 ` Mathieu Desnoyers
2010-02-13 17:16 ` [ltt-dev] [PATCH 04/11] define sync_core for x86 PIC Paolo Bonzini
2010-02-14 14:37 ` Mathieu Desnoyers
2010-02-15 8:10 ` Paolo Bonzini
2010-02-15 14:56 ` Mathieu Desnoyers [this message]
2010-02-13 17:16 ` [ltt-dev] [PATCH 05/11] __SIZEOF_LONG__ is always defined by GCC Paolo Bonzini
2010-02-14 14:38 ` Mathieu Desnoyers
2010-02-15 7:54 ` Paolo Bonzini
2010-02-13 17:16 ` [ltt-dev] [PATCH 06/11] remove compat_uatomic_cmpxchg #define from non-x86 Paolo Bonzini
2010-02-14 14:38 ` Mathieu Desnoyers
2010-02-13 17:16 ` [ltt-dev] [PATCH 07/11] add uatomic_gcc.h, use it for default definitions Paolo Bonzini
2010-02-14 14:45 ` Mathieu Desnoyers
2010-02-15 8:05 ` Paolo Bonzini
2010-02-15 14:55 ` Mathieu Desnoyers
2010-02-15 15:38 ` Paolo Bonzini
2010-02-15 16:23 ` Mathieu Desnoyers
2010-02-15 16:36 ` Paolo Bonzini
2010-02-15 16:51 ` Mathieu Desnoyers
2010-02-15 16:55 ` Paolo Bonzini
2010-02-15 17:13 ` Mathieu Desnoyers
2010-02-15 8:06 ` Paolo Bonzini
2010-02-13 17:16 ` [ltt-dev] [PATCH 08/11] use uatomic_gcc.h Paolo Bonzini
2010-02-13 17:16 ` [ltt-dev] [PATCH 09/11] move whether atomic byte/short exists to uatomic_arch_*.h Paolo Bonzini
2010-02-13 17:16 ` [ltt-dev] [PATCH 10/11] add Alpha support Paolo Bonzini
2010-02-13 17:16 ` [ltt-dev] [PATCH 11/11] support compiling on unknown architectures Paolo Bonzini
2010-02-13 17:16 ` [ltt-dev] [PATCH 12/11] test uatomic_gcc.h Paolo Bonzini
2010-02-14 14:25 ` [ltt-dev] [PATCH 00/11] Simplify system dependent URCU code Mathieu Desnoyers
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