#!/bin/sh# SPDX-License-Identifier: GPL-2.0-only# ----------------------------------------------------------------------# 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>## ---------------------------------------------------------------------- me=${0##*/} check_vmlinux(){ if file "$1" | grep -q 'Linux kernel.*boot executable' || readelf -h "$1" > /dev/null 2>&1 then cat "$1" echo "$me: Extracted vmlinux using '$2' from offset $3" >&2 exit 0 fi} 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 "$3" $pos done} # Check invocation:img=$1if [ $# -ne 1 -o ! -s "$img" ]then echo "Usage: $me <kernel-image>" >&2 exit 2fi # Prepare temp files:tmp=$(mktemp /tmp/vmlinux-XXX)trap "rm -f $tmp" 0 # That didn't work, so retry after decompression.try_decompress '\037\213\010' xy gunziptry_decompress '\3757zXZ\000' abcde unxztry_decompress 'BZh' xy bunzip2try_decompress '\135\0\0\0' xxx unlzmatry_decompress '\211\114\132' xy 'lzop -d'try_decompress '\002!L\030' xxx 'lz4 -d'try_decompress '(\265/\375' xxx unzstd # Finally check for uncompressed images or objects:check_vmlinux "$img" cat 0 # Bail out:echo "$me: Cannot find vmlinux." >&2
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0-only
# ----------------------------------------------------------------------
# extract-vmlinux - Extract uncompressed vmlinux from a kernel image
#
# Inspired from extract-ikconfig
# (c) 2009,2010 Dick Streefland <dick@streefland.net>
#
# (c) 2011 Corentin Chary <corentin.chary@gmail.com>
#
# ----------------------------------------------------------------------
me=${0##*/}
check_vmlinux()
{
if file "$1" | grep -q 'Linux kernel.*boot executable' ||
readelf -h "$1" > /dev/null 2>&1
then
cat "$1"
echo "$me: Extracted vmlinux using '$2' from offset $3" >&2
exit 0
fi
}
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 "$3" $pos
done
}
# Check invocation:
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 $tmp" 0
# That didn't work, so retry after decompression.
try_decompress '\037\213\010' xy gunzip
try_decompress '\3757zXZ\000' abcde unxz
try_decompress 'BZh' xy bunzip2
try_decompress '\135\0\0\0' xxx unlzma
try_decompress '\211\114\132' xy 'lzop -d'
try_decompress '\002!L\030' xxx 'lz4 -d'
try_decompress '(\265/\375' xxx unzstd
# Finally check for uncompressed images or objects:
check_vmlinux "$img" cat 0
# Bail out:
echo "$me: Cannot find vmlinux." >&2