From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 16137 invoked by alias); 17 Dec 2007 12:00:45 -0000 Received: (qmail 16125 invoked by uid 22791); 17 Dec 2007 12:00:44 -0000 X-Spam-Check-By: sourceware.org Received: from mx1.redhat.com (HELO mx1.redhat.com) (66.187.233.31) by sourceware.org (qpsmtpd/0.31) with ESMTP; Mon, 17 Dec 2007 12:00:40 +0000 Received: from int-mx1.corp.redhat.com (int-mx1.corp.redhat.com [172.16.52.254]) by mx1.redhat.com (8.13.8/8.13.1) with ESMTP id lBHC0bSI019904 for ; Mon, 17 Dec 2007 07:00:37 -0500 Received: from zebedee.littlepinkcloud.COM (vpn-14-10.rdu.redhat.com [10.11.14.10]) by int-mx1.corp.redhat.com (8.13.1/8.13.1) with ESMTP id lBHC0bd2027527; Mon, 17 Dec 2007 07:00:37 -0500 Received: from littlepinkcloud.COM (localhost.localdomain [127.0.0.1]) by zebedee.littlepinkcloud.COM (8.13.8/8.13.5) with ESMTP id lBHC0akg012172; Mon, 17 Dec 2007 12:00:36 GMT Received: (from aph@localhost) by littlepinkcloud.COM (8.13.8/8.13.5/Submit) id lBHC0aA3012169; Mon, 17 Dec 2007 12:00:36 GMT MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <18278.25828.17299.132249@zebedee.pink> Date: Mon, 17 Dec 2007 12:00:00 -0000 From: Andrew Haley To: Holger Eitzenberger Cc: gcc-help@gcc.gnu.org Subject: Re: (bad) disassemblie In-Reply-To: <87fxy1lhj4.fsf@kruemel.eitzenberger.org> References: <87fxy1lhj4.fsf@kruemel.eitzenberger.org> X-Mailer: VM 7.19 under Emacs 22.0.93.1 X-IsSubscribed: yes Mailing-List: contact gcc-help-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-help-owner@gcc.gnu.org X-SW-Source: 2007-12/txt/msg00309.txt.bz2 Holger Eitzenberger writes: > gcc-4.1.2 (vanilla) > Linux kernel 2.6.16.y > binutils 2.16.91.0.5 (SLES10) > > Hi list, > > while hunting down a strange Linux kernel bug I saw this in the > disassemblie: > > : > ... > c01ccf21: 0f 84 bd fe ff ff je c01ccde4 > c01ccf27: 0f 0b ud2a > c01ccf29: 1b 01 sbb (%ecx),%eax > c01ccf2b: ab stos %eax,%es:(%edi) > c01ccf2c: 78 31 js c01ccf5f > c01ccf2e: c0 e9 b0 shr $0xb0,%cl > c01ccf31: fe (bad) # <<< here > c01ccf32: ff (bad) > c01ccf33: ff c6 inc %esi > c01ccf35: 04 0a add $0xa,%al > c01ccf37: 01 e9 add %ebp,%ecx > > WRT to the two (bad) opcodes, should I start to worry? Looks like data to me, not code. Andrew. -- Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SL4 1TE, UK Registered in England and Wales No. 3798903