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>
This commit is contained in:
Родитель
322a8b0340
Коммит
09d481270d
|
@ -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
|
Загрузка…
Ссылка в новой задаче