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From: Mark Gross <markgross@thegnar.org>
Organization: thegnar
To: Andi Kleen <ak@muc.de>
Subject: Re: [patch] thread-aware coredumps, 2.5.43-C3
Date: Thu, 17 Oct 2002 19:58:23 -0700
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Cc: Andi Kleen <ak@muc.de>, Ingo Molnar <mingo@elte.hu>,
       Alexander Viro <viro@math.psu.edu>,
       S Vamsikrishna <vamsi_krishna@in.ibm.com>,
       Ulrich Drepper <drepper@redhat.com>, linux-kernel@vger.kernel.org,
       NPT library mailing list <phil-list@redhat.com>
References: <200210081627.g98GRZP18285@unix-os.sc.intel.com> <200210171835.21647.markgross@thegnar.org> <20021018021242.GA15853@averell>
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On Thursday 17 October 2002 07:12 pm, Andi Kleen wrote:
> I want the x86 CPU error code, which often has interesting clues on the
> problem. trapno would be useful too. I suspect other CPUs have similar
> extended state for exceptions.
>
> I usually hack my kernel to printk() it, but having it in the coredump
> would be more general and you can look at it later.
>
> Eventually (in a future kernel) I would love to have the exception
> handler save the last branch debugging registers of the CPU and the let the
> core dumper put that into the dump too.  Then you could easily
> figure out what the program did shortly before the crash.
>
> -Andi

Having the last branch before a crash would be cool.  Its easy to add note 
sections to core files.  If it turns out to be useful I'm sure the GDB folks 
would support it. 

--mgross
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