From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756270AbXKFRF4 (ORCPT ); Tue, 6 Nov 2007 12:05:56 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754197AbXKFRFt (ORCPT ); Tue, 6 Nov 2007 12:05:49 -0500 Received: from ebiederm.dsl.xmission.com ([166.70.28.69]:38793 "EHLO ebiederm.dsl.xmission.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753578AbXKFRFs (ORCPT ); Tue, 6 Nov 2007 12:05:48 -0500 From: ebiederm@xmission.com (Eric W. Biederman) To: "H. Peter Anvin" Cc: Jeremy Fitzhardinge , Linus Torvalds , Linux Kernel Mailing List , Thomas Gleixner , Ingo Molnar , Mikael Petterson Subject: Re: [GIT PULL] x86 setup: correct booting on 486 (revised) References: <200711050358.lA53wlho003349@tazenda.hos.anvin.org> <472F5941.2060507@zytor.com> <472F61C8.4040300@zytor.com> <472F7D8D.8050505@zytor.com> <472F826E.3050008@goop.org> <472F85F2.6040501@zytor.com> <472FBC83.5060509@goop.org> <472FBF40.1010300@zytor.com> <472FC0F3.10102@goop.org> <472FC401.9020202@zytor.com> <47309389.3080403@goop.org> <47309608.9030200@zytor.com> Date: Tue, 06 Nov 2007 10:04:13 -0700 In-Reply-To: <47309608.9030200@zytor.com> (H. Peter Anvin's message of "Tue, 06 Nov 2007 08:27:52 -0800") Message-ID: User-Agent: Gnus/5.110006 (No Gnus v0.6) Emacs/21.4 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org "H. Peter Anvin" writes: > Jeremy Fitzhardinge wrote: >> H. Peter Anvin wrote: >>> The ELF note format is sane enough, although it looks like it's not >>> self-terminating, so we'd either need an offset and a length field, or >>> adopt the convention that namesz = descsz = type = 0 terminates the >>> block (I prefer the latter, myself.) >> >> Hm, I think offset+length would be better: it's how they're represented >> in a normal ELF file, so you can just extract the length if you're >> extracting the notes. Also, generating a terminating note with the >> current linker-based notes machinery would be a bit of a pain. > > .notes : { > *(.note.*) > . = ALIGN(4); > LONG(0); > LONG(0); > LONG(0); > } > > Am I missing something? I don't think adding a length any harder. The all zero note is reserved so using it this way should be ok. Regardless this sounds like a sane thing to be looking at. Eric