blob: 5061abcc25409c4e095e8c5b25d3a8de3fb4db68
1 | #!/bin/sh |
2 | # ---------------------------------------------------------------------- |
3 | # extract-vmlinux - Extract uncompressed vmlinux from a kernel image |
4 | # |
5 | # Inspired from extract-ikconfig |
6 | # (c) 2009,2010 Dick Streefland <dick@streefland.net> |
7 | # |
8 | # (c) 2011 Corentin Chary <corentin.chary@gmail.com> |
9 | # |
10 | # Licensed under the GNU General Public License, version 2 (GPLv2). |
11 | # ---------------------------------------------------------------------- |
12 | |
13 | check_vmlinux() |
14 | { |
15 | # Use readelf to check if it's a valid ELF |
16 | # TODO: find a better to way to check that it's really vmlinux |
17 | # and not just an elf |
18 | readelf -h $1 > /dev/null 2>&1 || return 1 |
19 | |
20 | cat $1 |
21 | exit 0 |
22 | } |
23 | |
24 | try_decompress() |
25 | { |
26 | # The obscure use of the "tr" filter is to work around older versions of |
27 | # "grep" that report the byte offset of the line instead of the pattern. |
28 | |
29 | # Try to find the header ($1) and decompress from here |
30 | for pos in `tr "$1\n$2" "\n$2=" < "$img" | grep -abo "^$2"` |
31 | do |
32 | pos=${pos%%:*} |
33 | tail -c+$pos "$img" | $3 > $tmp 2> /dev/null |
34 | check_vmlinux $tmp |
35 | done |
36 | } |
37 | |
38 | # Check invocation: |
39 | me=${0##*/} |
40 | img=$1 |
41 | if [ $# -ne 1 -o ! -s "$img" ] |
42 | then |
43 | echo "Usage: $me <kernel-image>" >&2 |
44 | exit 2 |
45 | fi |
46 | |
47 | # Prepare temp files: |
48 | tmp=$(mktemp /tmp/vmlinux-XXX) |
49 | trap "rm -f $tmp" 0 |
50 | |
51 | # Initial attempt for uncompressed images or objects: |
52 | check_vmlinux $img |
53 | |
54 | # That didn't work, so retry after decompression. |
55 | try_decompress '\037\213\010' xy gunzip |
56 | try_decompress '\3757zXZ\000' abcde unxz |
57 | try_decompress 'BZh' xy bunzip2 |
58 | try_decompress '\135\0\0\0' xxx unlzma |
59 | try_decompress '\211\114\132' xy 'lzop -d' |
60 | |
61 | # Bail out: |
62 | echo "$me: Cannot find vmlinux." >&2 |
63 |