Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) #!/bin/sh
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) # SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) # ----------------------------------------------------------------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) # extract-vmlinux - Extract uncompressed vmlinux from a kernel image
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) #
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) # Inspired from extract-ikconfig
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) # (c) 2009,2010 Dick Streefland <dick@streefland.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) # (c) 2011      Corentin Chary <corentin.chary@gmail.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) # ----------------------------------------------------------------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) check_vmlinux()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 	# Use readelf to check if it's a valid ELF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 	# TODO: find a better to way to check that it's really vmlinux
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 	#       and not just an elf
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	readelf -h $1 > /dev/null 2>&1 || return 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	cat $1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	exit 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) try_decompress()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	# The obscure use of the "tr" filter is to work around older versions of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	# "grep" that report the byte offset of the line instead of the pattern.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	# Try to find the header ($1) and decompress from here
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	for	pos in `tr "$1\n$2" "\n$2=" < "$img" | grep -abo "^$2"`
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	do
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 		pos=${pos%%:*}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 		tail -c+$pos "$img" | $3 > $tmp 2> /dev/null
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 		check_vmlinux $tmp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	done
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) # Check invocation:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) me=${0##*/}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) img=$1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) if	[ $# -ne 1 -o ! -s "$img" ]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) then
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	echo "Usage: $me <kernel-image>" >&2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	exit 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) fi
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) # Prepare temp files:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) tmp=$(mktemp /tmp/vmlinux-XXX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) trap "rm -f $tmp" 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) # That didn't work, so retry after decompression.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) try_decompress '\037\213\010' xy    gunzip
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) try_decompress '\3757zXZ\000' abcde unxz
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) try_decompress 'BZh'          xy    bunzip2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) try_decompress '\135\0\0\0'   xxx   unlzma
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) try_decompress '\211\114\132' xy    'lzop -d'
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) try_decompress '\002!L\030'   xxx   'lz4 -d'
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) try_decompress '(\265/\375'   xxx   unzstd
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) # Finally check for uncompressed images or objects:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) check_vmlinux $img
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) # Bail out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) echo "$me: Cannot find vmlinux." >&2