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author | Corentin Chary <corentincj@iksaif.net> | 2011-08-16 10:46:05 +0200 |
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committer | Michal Marek <mmarek@suse.cz> | 2011-08-31 16:12:17 +0200 |
commit | 09d481270d445d98342d8ab872f05491b6d23f8b (patch) | |
tree | 246731d9ba68b6a5193976e1c487287657634313 /scripts | |
parent | Linux 3.1-rc1 (diff) | |
download | linux-09d481270d445d98342d8ab872f05491b6d23f8b.tar.xz linux-09d481270d445d98342d8ab872f05491b6d23f8b.zip |
scripts: add extract-vmlinux
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 <corentincj@iksaif.net>
Signed-off-by: Michal Marek <mmarek@suse.cz>
Diffstat (limited to 'scripts')
-rwxr-xr-x | scripts/extract-vmlinux | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/scripts/extract-vmlinux b/scripts/extract-vmlinux new file mode 100755 index 000000000000..5061abcc2540 --- /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 <dick@streefland.net> +# +# (c) 2011 Corentin Chary <corentin.chary@gmail.com> +# +# 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: $me <kernel-image>" >&2 + exit 2 +fi + +# Prepare temp files: +tmp=$(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 |