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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" | |
7 | ||
8 | IKCFG_ST="0x49 0x4b 0x43 0x46 0x47 0x5f 0x53 0x54" | |
9 | IKCFG_ED="0x49 0x4b 0x43 0x46 0x47 0x5f 0x45 0x44" | |
10 | function dump_config { | |
11 | typeset file="$1" | |
12 | ||
13 | start=`$binoffset $file $IKCFG_ST 2>/dev/null` | |
14 | [ "$?" != "0" ] && start="-1" | |
15 | if [ "$start" -eq "-1" ]; then | |
16 | return | |
17 | fi | |
18 | end=`$binoffset $file $IKCFG_ED 2>/dev/null` | |
19 | ||
20 | let start="$start + 8" | |
21 | let size="$end - $start" | |
22 | ||
23 | head --bytes="$end" "$file" | tail --bytes="$size" | zcat | |
24 | ||
25 | clean_up | |
26 | exit 0 | |
27 | } | |
28 | ||
29 | ||
30 | usage() | |
31 | { | |
32 | echo " usage: extract-ikconfig [b]zImage_filename" | |
33 | } | |
34 | ||
35 | clean_up() | |
36 | { | |
37 | if [ "$TMPFILE" != "" ]; then | |
38 | rm -f $TMPFILE | |
39 | fi | |
40 | } | |
41 | ||
42 | if [ $# -lt 1 ] | |
43 | then | |
44 | usage | |
45 | exit 1 | |
46 | fi | |
47 | ||
48 | TMPFILE="/tmp/ikconfig-$$" | |
49 | image="$1" | |
50 | ||
51 | # vmlinux: Attempt to dump the configuration from the file directly | |
52 | dump_config "$image" | |
53 | ||
54 | GZHDR1="0x1f 0x8b 0x08 0x00" | |
55 | GZHDR2="0x1f 0x8b 0x08 0x08" | |
56 | ||
57 | # vmlinux.gz: Check for a compressed images | |
58 | off=`$binoffset "$image" $GZHDR1 2>/dev/null` | |
59 | [ "$?" != "0" ] && off="-1" | |
60 | if [ "$off" -eq "-1" ]; then | |
61 | off=`$binoffset "$image" $GZHDR2 2>/dev/null` | |
62 | [ "$?" != "0" ] && off="-1" | |
63 | fi | |
64 | if [ "$off" -eq "0" ]; then | |
65 | zcat <"$image" >"$TMPFILE" | |
66 | dump_config "$TMPFILE" | |
67 | elif [ "$off" -ne "-1" ]; then | |
68 | (dd ibs="$off" skip=1 count=0 && dd bs=512k) <"$image" 2>/dev/null | \ | |
69 | zcat >"$TMPFILE" | |
70 | dump_config "$TMPFILE" | |
71 | fi | |
72 | ||
73 | echo "ERROR: Unable to extract kernel configuration information." | |
74 | echo " This kernel image may not have the config info." | |
75 | ||
76 | clean_up | |
77 | exit 1 |