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Message-ID: <3DC4D0F1.309@redhat.com>
Date: Sat, 02 Nov 2002 23:32:01 -0800
From: Ulrich Drepper <drepper@redhat.com>
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To: phil-list@redhat.com
CC: Mark Gross <markgross@thegnar.org>, Andi Kleen <ak@muc.de>,
       Ingo Molnar <mingo@elte.hu>, Alexander Viro <viro@math.psu.edu>,
       S Vamsikrishna <vamsi_krishna@in.ibm.com>, linux-kernel@vger.kernel.org
Subject: Re: [patch] thread-aware coredumps, 2.5.43-C3
References: <200210081627.g98GRZP18285@unix-os.sc.intel.com> <200210171835.21647.markgross@thegnar.org> <20021018021242.GA15853@averell> <200210171958.23198.markgross@thegnar.org> <20021021151747.GA227@elf.ucw.cz>
In-Reply-To: <20021021151747.GA227@elf.ucw.cz>
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Pavel Machek wrote:

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>>Having the last branch before a crash would be cool.  Its easy to
>>add note 
> 
> 
> How do you get that info in the first place? I do not think CPU stores
> info about last branch it did...

Haven't seen a reply so far so here it goes.

Look at Intel's System Programming manual for P4.  One of the MSRs
stores this information.  0x1d7 on P4/P4 Xeon.

- -- 
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Ulrich Drepper \    ,-----------------'   \ Mountain View, CA 94041 USA
Red Hat         `--' drepper at redhat.com `---------------------------
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