Version:  2.6.24 2.6.25 2.6.26 2.6.27 2.6.28

Architecture:  x86 m68k m68knommu mips powerpc sh blackfin

Linux/scripts/extract-ikconfig

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

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