09d481270d
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>
62 lines
1.6 KiB
Bash
Executable file
62 lines
1.6 KiB
Bash
Executable file
#!/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
|