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From: Andi Kleen <ak@muc.de>
To: "Zhang, Yanmin" <yanmin.zhang@intel.com>
Cc: <linux-kernel@vger.kernel.org>
Subject: Re: 32bit processes at compatbility mode on x86_64 machines fail to restart syscall after processing a signal
Date: Thu, 19 May 2005 03:49:10 +0200	[thread overview]
Message-ID: <m164xgyoh5.fsf@muc.de> (raw)
In-Reply-To: <8126E4F969BA254AB43EA03C59F44E84021E9C58@pdsmsx404> (Yanmin Zhang's message of "Thu, 19 May 2005 09:18:59 +0800")

"Zhang, Yanmin" <yanmin.zhang@intel.com> writes:

> The test case at
> http://cvs.sourceforge.net/viewcvs.py/posixtest/posixtestsuite/conforman
> ce/interfaces/clock_nanosleep/1-5.c fails if it runs as a 32bit process
> on x86_86 machines.
>
> The root cause is the sub 32bit process fails to restart the syscall
> after it is interrupted
> by a signal.
>
> The syscall number of sys_restart_syscall in table sys_call_table is 
> __NR_restart_syscall (219) while it's __NR_ia32_restart_syscall (0) in
> ia32_sys_call_table. When regs->rax==(unsigned
> long)-ERESTART_RESTARTBLOCK,
> function do_signal doesn't distinguish if the process is 64bit or 32bit,
> and always sets
> restart syscall number as __NR_restart_syscall (219).

Thanks for tracking this down. Queued.

-Andi


      reply	other threads:[~2005-05-19  1:49 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-05-19  1:18 32bit processes at compatbility mode on x86_64 machines fail to restart syscall after processing a signal Zhang, Yanmin
2005-05-19  1:49 ` Andi Kleen [this message]

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