From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 1758 invoked by alias); 20 Jul 2009 19:53:15 -0000 Received: (qmail 1733 invoked by uid 22791); 20 Jul 2009 19:53:14 -0000 X-SWARE-Spam-Status: No, hits=-1.6 required=5.0 tests=AWL,BAYES_00,MSGID_FROM_MTA_HEADER,SPF_PASS X-Spam-Check-By: sourceware.org Received: from mtagate7.de.ibm.com (HELO mtagate7.de.ibm.com) (195.212.29.156) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Mon, 20 Jul 2009 19:53:02 +0000 Received: from d12nrmr1607.megacenter.de.ibm.com (d12nrmr1607.megacenter.de.ibm.com [9.149.167.49]) by mtagate7.de.ibm.com (8.14.3/8.13.8) with ESMTP id n6KJqn94692286 for ; Mon, 20 Jul 2009 19:52:49 GMT Received: from d12av02.megacenter.de.ibm.com (d12av02.megacenter.de.ibm.com [9.149.165.228]) by d12nrmr1607.megacenter.de.ibm.com (8.13.8/8.13.8/NCO v9.2) with ESMTP id n6KJqn8X2601152 for ; Mon, 20 Jul 2009 21:52:49 +0200 Received: from d12av02.megacenter.de.ibm.com (loopback [127.0.0.1]) by d12av02.megacenter.de.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id n6KJqnVx020780 for ; Mon, 20 Jul 2009 21:52:49 +0200 Received: from tuxmaker.boeblingen.de.ibm.com (tuxmaker.boeblingen.de.ibm.com [9.152.85.9]) by d12av02.megacenter.de.ibm.com (8.12.11.20060308/8.12.11) with SMTP id n6KJqlVV020759; Mon, 20 Jul 2009 21:52:47 +0200 Message-Id: <200907201952.n6KJqlVV020759@d12av02.megacenter.de.ibm.com> Received: by tuxmaker.boeblingen.de.ibm.com (sSMTP sendmail emulation); Mon, 20 Jul 2009 21:52:47 +0200 Subject: Re: Backtracing broken core dumps To: naesten@gmail.com (Samuel Bronson) Date: Mon, 20 Jul 2009 19:53:00 -0000 From: "Ulrich Weigand" Cc: thiago.bauermann@gmail.com (Thiago Jung Bauermann), gdb@sourceware.org, schwab@linux-m68k.org (Andreas Schwab), Catherine.Smith@arrows.demon.co.uk (Catherine Smith) In-Reply-To: <87fxcrdukv.wl%naesten@gmail.com> from "Samuel Bronson" at Jul 20, 2009 03:26:40 PM MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Mailing-List: contact gdb-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-owner@sourceware.org X-SW-Source: 2009-07/txt/msg00146.txt.bz2 Samuel Bronson wrote: > At Sun, 19 Jul 2009 22:49:05 -0300, > Thiago Bauermann wrote: > > IIRC Ulrich Weigand considers that usage of the frame command to be > > deprecated... I don't know the rationale though. > > I believe the rationale is that it doesn't actually work very well :-). Well yes, and more importantly that it cannot be made to work well, because -as Paul Koning already pointed out- just specifying a stack address simply does not reliably identify a stack frame. On many platforms, you *need* a PC in addition to the stack address in order to be able to unwind further. On some platforms (IA64) you may even need yet more information (register stack address) ... Bye, Ulrich -- Dr. Ulrich Weigand GNU Toolchain for Linux on System z and Cell BE Ulrich.Weigand@de.ibm.com