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From: mgross <mgross@unix-os.sc.intel.com>
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Organization: SSG Intel
To: Daniel Jacobowitz <dan@debian.org>, linux-kernel@vger.kernel.org
Subject: Re: [patch] thread-aware coredumps, 2.5.43-C3
Date: Fri, 18 Oct 2002 10:00:12 -0400
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References: <200210081627.g98GRZP18285@unix-os.sc.intel.com> <200210171958.23198.markgross@thegnar.org> <20021018035510.GA3568@nevyn.them.org>
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On Thursday 17 October 2002 11:55 pm, Daniel Jacobowitz wrote:
> On Thu, Oct 17, 2002 at 07:58:23PM -0700, Mark Gross wrote:
> >?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.
>
> Absolutely. ?The GDB side would be pretty easy.

Sounds like fun ;)  Making it generic and extencible will be a challenge,  
for both GDB and the Linux kernel.

--mgross
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