From: Andi Kleen <ak@suse.de>
To: Chris.Gottbrath@etnus.com
Cc: chrisg@etnus.com, marcelo@conectiva.com.br, discuss@x86-64.org,
linux-kernel@vger.kernel.org, jdelsign@etnus.com
Subject: Re: [PATCH] x86-64 only: ia32entry.S reg changes dropped during debugging
Date: Thu, 27 May 2004 01:33:39 +0200 [thread overview]
Message-ID: <20040527013339.60f590cf.ak@suse.de> (raw)
In-Reply-To: <Pine.LNX.4.58.0405261822370.8575@papua.etnus.com>
On Wed, 26 May 2004 18:50:11 -0400 (EDT)
Chris Gottbrath <chrisg@etnus.com> wrote:
>
> Andi,
>
> We develop a debugger for linux x86-64 called TotalView. We have
> recently tracked down a problem to the fact that some register changes
> made by the debugger in the target are getting discarded. This is only
> happening with the 2.4.x kernels on x86-64. It appears that the
> bug may have been fixed as a side effect of some other change in 2.6.x.
>
> The scenario is that the debugger uses ptrace(PTRACE_SYSCALL,) and
> changes some registers in the process while it is stopped in a
> system call. We are finding that the system call entry code discards
> changes to R15, R14, R13, R12, RBP, and RBX.
>
> The following patch is against arch/x86_64/ia32/ia32entry.S in 2.4.26.
Looks good. Thanks.
-Andi
prev parent reply other threads:[~2004-05-26 23:33 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-26 22:50 Chris Gottbrath
2004-05-26 23:33 ` Andi Kleen [this message]
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