Merge branch 'for-greg' of git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb...
[zen-stable.git] / scripts / extract-vmlinux
blob5061abcc25409c4e095e8c5b25d3a8de3fb4db68
1 #!/bin/sh
2 # ----------------------------------------------------------------------
3 # extract-vmlinux - Extract uncompressed vmlinux from a kernel image
5 # Inspired from extract-ikconfig
6 # (c) 2009,2010 Dick Streefland <dick@streefland.net>
8 # (c) 2011 Corentin Chary <corentin.chary@gmail.com>
10 # Licensed under the GNU General Public License, version 2 (GPLv2).
11 # ----------------------------------------------------------------------
13 check_vmlinux()
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
20 cat $1
21 exit 0
24 try_decompress()
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.
29 # Try to find the header ($1) and decompress from here
30 for pos in `tr "$1\n$2" "\n$2=" < "$img" | grep -abo "^$2"`
32 pos=${pos%%:*}
33 tail -c+$pos "$img" | $3 > $tmp 2> /dev/null
34 check_vmlinux $tmp
35 done
38 # Check invocation:
39 me=${0##*/}
40 img=$1
41 if [ $# -ne 1 -o ! -s "$img" ]
42 then
43 echo "Usage: $me <kernel-image>" >&2
44 exit 2
47 # Prepare temp files:
48 tmp=$(mktemp /tmp/vmlinux-XXX)
49 trap "rm -f $tmp" 0
51 # Initial attempt for uncompressed images or objects:
52 check_vmlinux $img
54 # That didn't work, so retry after decompression.
55 try_decompress '\037\213\010' xy gunzip
56 try_decompress '\3757zXZ\000' abcde unxz
57 try_decompress 'BZh' xy bunzip2
58 try_decompress '\135\0\0\0' xxx unlzma
59 try_decompress '\211\114\132' xy 'lzop -d'
61 # Bail out:
62 echo "$me: Cannot find vmlinux." >&2