Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Thu, 13 Mar 2003 16:56:47 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 13 Mar 2003 16:56:47 -0500 Received: from inti.inf.utfsm.cl ([200.1.21.155]:38062 "EHLO inti.inf.utfsm.cl") by vger.kernel.org with ESMTP id ; Thu, 13 Mar 2003 16:55:39 -0500 Message-Id: <200303132104.h2DL4TKf005825@eeyore.valparaiso.cl> To: Szakacsits Szabolcs cc: linux-kernel@vger.kernel.org Subject: Re: 2.5.63 accesses below %esp (was: Re: ntfs OOPS (2.5.63)) In-Reply-To: Your message of "Wed, 12 Mar 2003 23:03:20 +0100." Date: Thu, 13 Mar 2003 17:04:29 -0400 From: Horst von Brand Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1540 Lines: 33 Szakacsits Szabolcs said: > On Wed, 12 Mar 2003, Horst von Brand wrote: > > It is _hard_ to do with variable length instructions (CISC, remember?), the > > code is designed to be easily decoded forward, noone executes code going > > backwards. > Of course, it's a bad approach. You start earlier and stop at EIP. > Repeat this for max(instruction length) different offsets and you will > have the winner. Figure it out from the context after EIP. By hand, OK. Automatically, no. > > When I needed to look at the code in an Oops I'd either objdump(1)ed it or > > compiled the offending stuff to assembler (possibly with custom CFLAGS to > > get info on line numbers and such in the output). > I was talking about cases when you can't do these. I did this to find out where in the source it went south, and then look around to find out why. A copy of that kernel's source is required anyway. If you can divine the breakage just from the asm, more power to you. For us mere mortals it isn't enough. -- Dr. Horst H. von Brand User #22616 counter.li.org Departamento de Informatica Fono: +56 32 654431 Universidad Tecnica Federico Santa Maria +56 32 654239 Casilla 110-V, Valparaiso, Chile Fax: +56 32 797513 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/