linux/scripts/extract-vmlinux
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   1#!/bin/sh
   2# ----------------------------------------------------------------------
   3# extract-vmlinux - Extract uncompressed vmlinux from a kernel image
   4#
   5# Inspired from extract-ikconfig
   6# (c) 2009,2010 Dick Streefland <dick@streefland.net>
   7#
   8# (c) 2011      Corentin Chary <corentin.chary@gmail.com>
   9#
  10# Licensed under the GNU General Public License, version 2 (GPLv2).
  11# ----------------------------------------------------------------------
  12
  13check_vmlinux()
  14{
  15        # Use readelf to check if it's a valid ELF
  16        # TODO: find a better to way to check that it's really vmlinux
  17        #       and not just an elf
  18        readelf -h $1 > /dev/null 2>&1 || return 1
  19
  20        cat $1
  21        exit 0
  22}
  23
  24try_decompress()
  25{
  26        # The obscure use of the "tr" filter is to work around older versions of
  27        # "grep" that report the byte offset of the line instead of the pattern.
  28
  29        # Try to find the header ($1) and decompress from here
  30        for     pos in `tr "$1\n$2" "\n$2=" < "$img" | grep -abo "^$2"`
  31        do
  32                pos=${pos%%:*}
  33                tail -c+$pos "$img" | $3 > $tmp 2> /dev/null
  34                check_vmlinux $tmp
  35        done
  36}
  37
  38# Check invocation:
  39me=${0##*/}
  40img=$1
  41if      [ $# -ne 1 -o ! -s "$img" ]
  42then
  43        echo "Usage: $me <kernel-image>" >&2
  44        exit 2
  45fi
  46
  47# Prepare temp files:
  48tmp=$(mktemp /tmp/vmlinux-XXX)
  49trap "rm -f $tmp" 0
  50
  51# Initial attempt for uncompressed images or objects:
  52check_vmlinux $img
  53
  54# That didn't work, so retry after decompression.
  55try_decompress '\037\213\010' xy    gunzip
  56try_decompress '\3757zXZ\000' abcde unxz
  57try_decompress 'BZh'          xy    bunzip2
  58try_decompress '\135\0\0\0'   xxx   unlzma
  59try_decompress '\211\114\132' xy    'lzop -d'
  60
  61# Bail out:
  62echo "$me: Cannot find vmlinux." >&2
  63
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