linux/scripts/extract-vmlinux at multikernel-riscv · multikernel/linux · GitHub

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#!/bin/sh

# SPDX-License-Identifier: GPL-2.0-only

# ----------------------------------------------------------------------

# extract-vmlinux - Extract uncompressed vmlinux from a kernel image

# Inspired from extract-ikconfig

# ----------------------------------------------------------------------

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

}

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"`

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

# 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

linux/scripts/extract-vmlinux at multikernel-riscv · multikernel/linux · GitHub

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