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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" | |
efddd795 WA |
11 | dump_config() { |
12 | file="$1" | |
1da177e4 LT |
13 | |
14 | start=`$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 $IKCFG_ED 2>/dev/null` | |
fd3132d5 SR |
20 | [ "$?" != "0" ] && end="-1" |
21 | if [ "$end" -eq "-1" ]; then | |
22 | return | |
23 | fi | |
1da177e4 | 24 | |
efddd795 WA |
25 | start=`expr $start + 8` |
26 | size=`expr $end - $start` | |
1da177e4 | 27 | |
008accbb | 28 | dd if="$file" ibs=1 skip="$start" count="$size" 2>/dev/null | zcat |
1da177e4 LT |
29 | |
30 | clean_up | |
31 | exit 0 | |
32 | } | |
33 | ||
34 | ||
35 | usage() | |
36 | { | |
37 | echo " usage: extract-ikconfig [b]zImage_filename" | |
38 | } | |
39 | ||
40 | clean_up() | |
41 | { | |
42 | if [ "$TMPFILE" != "" ]; then | |
43 | rm -f $TMPFILE | |
44 | fi | |
45 | } | |
46 | ||
47 | if [ $# -lt 1 ] | |
48 | then | |
49 | usage | |
50 | exit 1 | |
51 | fi | |
52 | ||
66f9f59a | 53 | TMPFILE=`mktemp -t ikconfig-XXXXXX` || exit 1 |
1da177e4 LT |
54 | image="$1" |
55 | ||
56 | # vmlinux: Attempt to dump the configuration from the file directly | |
57 | dump_config "$image" | |
58 | ||
59 | GZHDR1="0x1f 0x8b 0x08 0x00" | |
60 | GZHDR2="0x1f 0x8b 0x08 0x08" | |
61 | ||
6be51ffc SR |
62 | ELFHDR="0x7f 0x45 0x4c 0x46" |
63 | ||
1da177e4 LT |
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" | |
70 | fi | |
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) <"$image" 2>/dev/null | \ | |
76 | zcat >"$TMPFILE" | |
77 | dump_config "$TMPFILE" | |
6be51ffc SR |
78 | |
79 | # check if this is simply an ELF file | |
80 | else | |
81 | off=`$binoffset "$image" $ELFHDR 2>/dev/null` | |
82 | [ "$?" != "0" ] && off="-1" | |
83 | if [ "$off" -eq "0" ]; then | |
84 | dump_config "$image" | |
85 | fi | |
1da177e4 LT |
86 | fi |
87 | ||
88 | echo "ERROR: Unable to extract kernel configuration information." | |
89 | echo " This kernel image may not have the config info." | |
90 | ||
91 | clean_up | |
92 | exit 1 |