checkpatch: macro complexity checks are meaningless in linker scripts
[linux-2.6.git] / 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