Commit | Line | Data |
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1da177e4 LT |
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" | |
ff45e99d | 7 | test -e $binoffset || cc -o $binoffset ./scripts/binoffset.c || exit 1 |
1da177e4 LT |
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 - $start" | |
23 | ||
008accbb | 24 | dd if="$file" ibs=1 skip="$start" count="$size" 2>/dev/null | zcat |
1da177e4 LT |
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 | ||
66f9f59a | 49 | TMPFILE=`mktemp -t ikconfig-XXXXXX` || exit 1 |
1da177e4 LT |
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 |