2 # extracts .config info from a [b]zImage file
3 # uses: binoffset (new), dd, zcat, strings, grep
4 # $arg1 is [b]zImage filename
6 binoffset
="./scripts/binoffset"
7 test -e $binoffset || cc
-o $binoffset .
/scripts
/binoffset.c ||
exit 1
9 IKCFG_ST
="0x49 0x4b 0x43 0x46 0x47 0x5f 0x53 0x54"
10 IKCFG_ED
="0x49 0x4b 0x43 0x46 0x47 0x5f 0x45 0x44"
14 start
=`$binoffset $file $IKCFG_ST 2>/dev/null`
15 [ "$?" != "0" ] && start
="-1"
16 if [ "$start" -eq "-1" ]; then
19 end
=`$binoffset $file $IKCFG_ED 2>/dev/null`
20 [ "$?" != "0" ] && end
="-1"
21 if [ "$end" -eq "-1" ]; then
25 start
=`expr $start + 8`
26 size
=`expr $end - $start`
28 dd if="$file" ibs
=1 skip
="$start" count
="$size" 2>/dev
/null | zcat
37 echo " usage: extract-ikconfig [b]zImage_filename"
42 if [ "$TMPFILE" != "" ]; then
53 TMPFILE
=`mktemp -t ikconfig-XXXXXX` ||
exit 1
56 # vmlinux: Attempt to dump the configuration from the file directly
59 GZHDR1
="0x1f 0x8b 0x08 0x00"
60 GZHDR2
="0x1f 0x8b 0x08 0x08"
62 ELFHDR
="0x7f 0x45 0x4c 0x46"
64 # vmlinux.gz: Check for a compressed images
65 off
=`$binoffset "$image" $GZHDR1 2>/dev/null`
66 [ "$?" != "0" ] && off
="-1"
67 if [ "$off" -eq "-1" ]; then
68 off
=`$binoffset "$image" $GZHDR2 2>/dev/null`
69 [ "$?" != "0" ] && off
="-1"
71 if [ "$off" -eq "0" ]; then
72 zcat
<"$image" >"$TMPFILE"
73 dump_config
"$TMPFILE"
74 elif [ "$off" -ne "-1" ]; then
75 (dd ibs
="$off" skip
=1 count
=0 && dd bs
=512k
) <"$image" 2>/dev
/null | \
77 dump_config
"$TMPFILE"
79 # check if this is simply an ELF file
81 off
=`$binoffset "$image" $ELFHDR 2>/dev/null`
82 [ "$?" != "0" ] && off
="-1"
83 if [ "$off" -eq "0" ]; then
88 echo "ERROR: Unable to extract kernel configuration information."
89 echo " This kernel image may not have the config info."
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