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>
1.6 KiB
Executable File
#!/bin/sh
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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).
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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: $me " >&2 exit 2 fi
Prepare temp files:
tmp=$(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