1#!/bin/sh 2# extracts .config info from a [b]zImage file 3# uses: binoffset (new), dd, zcat, strings, grep 4# $arg1 is [b]zImage filename 5 6binoffset="./scripts/binoffset" 7test -e $binoffset || cc -o $binoffset ./scripts/binoffset.c || exit 1 8 9IKCFG_ST="0x49 0x4b 0x43 0x46 0x47 0x5f 0x53 0x54" 10IKCFG_ED="0x49 0x4b 0x43 0x46 0x47 0x5f 0x45 0x44" 11dump_config() { 12 file="$1" 13 14 start=`$binoffset $file $IKCFG_ST 2>/dev/null` 15 [ "$?" != "0" ] && start="-1" 16 if [ "$start" -eq "-1" ]; then 17 return 18 fi 19 end=`$binoffset $file $IKCFG_ED 2>/dev/null` 20 [ "$?" != "0" ] && end="-1" 21 if [ "$end" -eq "-1" ]; then 22 return 23 fi 24 25 start=`expr $start + 8` 26 size=`expr $end - $start` 27 28 dd if="$file" ibs=1 skip="$start" count="$size" 2>/dev/null | zcat 29 30 clean_up 31 exit 0 32} 33 34 35usage() 36{ 37 echo " usage: extract-ikconfig [b]zImage_filename" 38} 39 40clean_up() 41{ 42 if [ "$TMPFILE" != "" ]; then 43 rm -f $TMPFILE 44 fi 45} 46 47if [ $# -lt 1 ] 48then 49 usage 50 exit 1 51fi 52 53TMPFILE=`mktemp -t ikconfig-XXXXXX` || exit 1 54image="$1" 55 56# vmlinux: Attempt to dump the configuration from the file directly 57dump_config "$image" 58 59GZHDR1="0x1f 0x8b 0x08 0x00" 60GZHDR2="0x1f 0x8b 0x08 0x08" 61 62# vmlinux.gz: Check for a compressed images 63off=`$binoffset "$image" $GZHDR1 2>/dev/null` 64[ "$?" != "0" ] && off="-1" 65if [ "$off" -eq "-1" ]; then 66 off=`$binoffset "$image" $GZHDR2 2>/dev/null` 67 [ "$?" != "0" ] && off="-1" 68fi 69if [ "$off" -eq "0" ]; then 70 zcat <"$image" >"$TMPFILE" 71 dump_config "$TMPFILE" 72elif [ "$off" -ne "-1" ]; then 73 (dd ibs="$off" skip=1 count=0 && dd bs=512k) <"$image" 2>/dev/null | \ 74 zcat >"$TMPFILE" 75 dump_config "$TMPFILE" 76fi 77 78echo "ERROR: Unable to extract kernel configuration information." 79echo " This kernel image may not have the config info." 80 81clean_up 82exit 1 83