From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751725Ab1HPImV (ORCPT ); Tue, 16 Aug 2011 04:42:21 -0400 Received: from smtp5-g21.free.fr ([212.27.42.5]:54353 "EHLO smtp5-g21.free.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751666Ab1HPImU (ORCPT ); Tue, 16 Aug 2011 04:42:20 -0400 From: Corentin Chary To: linux-kernel@vger.kernel.org Cc: Michal Marek , Dick Streefland , WANG Cong , Corentin Chary Subject: [PATCH v3] scripts: add extract-vmlinux Date: Tue, 16 Aug 2011 10:46:05 +0200 Message-Id: <1313484365-22129-1-git-send-email-corentincj@iksaif.net> X-Mailer: git-send-email 1.7.3.4 In-Reply-To: <1312465977-12388-1-git-send-email-corentin.chary@gmail.com> References: <1312465977-12388-1-git-send-email-corentin.chary@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This script can be used to extract vmlinux from a compressed kernel image (bzImage, etc..). It's inspired from (a subset of) extract-ikconfig. It's something a lot of people have been looking for (mainly people with xen < 4 that doesn't support bzImages at all). Signed-off-by: Corentin Chary --- Since v1: * update license Since v2: * add some comments scripts/extract-vmlinux | 62 +++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 62 insertions(+), 0 deletions(-) create mode 100755 scripts/extract-vmlinux diff --git a/scripts/extract-vmlinux b/scripts/extract-vmlinux new file mode 100755 index 0000000..4ab8517 --- /dev/null +++ b/scripts/extract-vmlinux @@ -0,0 +1,62 @@ +#!/bin/sh +# ---------------------------------------------------------------------- +# extract-vmlinux - Extract uncompressed vmlinux from a kernel image +# +# Inspired from extract-ikconfig +# (c) 2009,2010 Dick Streefland +# +# (c) 2011 Corentin Chary +# +# Licensed under the GNU General Public License, version 2 (GPLv2). +# ---------------------------------------------------------------------- + +check_vmlinux() +{ + # Use readelf to check if it's a valid ELF + # TODO: find a better to way to check that it's really vmlinux + # and not just an elf + readelf -h $1 > /dev/null 2>&1 || return 1 + + cat $1 + exit 0 +} + +try_decompress() +{ + # The obscure use of the "tr" filter is to work around older versions of + # "grep" that report the byte offset of the line instead of the pattern. + + # Try to find the header ($1) and decompress from here + for pos in `tr "$1\n$2" "\n$2=" < "$img" | grep -abo "^$2"` + do + pos=${pos%%:*} + tail -c+$pos "$img" | $3 > $tmp 2> /dev/null + check_vmlinux $tmp + done +} + +# Check invocation: +me=${0##*/} +img=$1 +if [ $# -ne 1 -o ! -s "$img" ] +then + echo "Usage: $me " >&2 + exit 2 +fi + +# Prepare temp files: +tmp=$(mktemp /tmp/vmlinux-XXX) +trap "rm -f $tmp" 0 + +# Initial attempt for uncompressed images or objects: +check_vmlinux $img + +# That didn't work, so retry after decompression. +try_decompress '\037\213\010' xy gunzip +try_decompress '\3757zXZ\000' abcde unxz +try_decompress 'BZh' xy bunzip2 +try_decompress '\135\0\0\0' xxx unlzma +try_decompress '\211\114\132' xy 'lzop -d' + +# Bail out: +echo "$me: Cannot find vmlinux." >&2 -- 1.7.3.4