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Steven Rostedt 6be51ffc17 kconfig: have extract-ikconfig read ELF files

It would be nice to use extract-ikconfig to find the congfig.gz
in either vmlinux (not vmlinuz) or configs.ko.

This patch changes the script to also be able to read ELF files directly.

[ Impact: find config.gz in vmlinux and configs.ko ]

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

2009-08-18 22:00:18 -04:00

1.9 KiB

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#!/bin/sh

extracts .config info from a [b]zImage file

uses: binoffset (new), dd, zcat, strings, grep

$arg1 is [b]zImage filename

binoffset="./scripts/binoffset" test -e $binoffset || cc -o $binoffset ./scripts/binoffset.c || exit 1

IKCFG_ST="0x49 0x4b 0x43 0x46 0x47 0x5f 0x53 0x54" IKCFG_ED="0x49 0x4b 0x43 0x46 0x47 0x5f 0x45 0x44" dump_config() { file="$1"

start=`$binoffset $file $IKCFG_ST 2>/dev/null`
[ "$?" != "0" ] && start="-1"
if [ "$start" -eq "-1" ]; then
return
fi
end=`$binoffset $file $IKCFG_ED 2>/dev/null`
[ "$?" != "0" ] && end="-1"
if [ "$end" -eq "-1" ]; then
return
fi

start=`expr $start + 8`
size=`expr $end - $start`

dd if="$file" ibs=1 skip="$start" count="$size" 2>/dev/null | zcat

clean_up
exit 0

}

usage() { echo " usage: extract-ikconfig [b]zImage_filename" }

clean_up() { if [ "$TMPFILE" != "" ]; then rm -f $TMPFILE fi }

if [ $# -lt 1 ] then usage exit 1 fi

TMPFILE=mktemp -t ikconfig-XXXXXX || exit 1 image="$1"

vmlinux: Attempt to dump the configuration from the file directly

dump_config "$image"

GZHDR1="0x1f 0x8b 0x08 0x00" GZHDR2="0x1f 0x8b 0x08 0x08"

ELFHDR="0x7f 0x45 0x4c 0x46"

vmlinux.gz: Check for a compressed images

off=$binoffset "$image" $GZHDR1 2>/dev/null [ "$?" != "0" ] && off="-1" if [ "$off" -eq "-1" ]; then off=$binoffset "$image" $GZHDR2 2>/dev/null [ "$?" != "0" ] && off="-1" fi if [ "$off" -eq "0" ]; then zcat <"$image" >"$TMPFILE" dump_config "$TMPFILE" elif [ "$off" -ne "-1" ]; then (dd ibs="$off" skip=1 count=0 && dd bs=512k) <"$image" 2>/dev/null |
zcat >"$TMPFILE" dump_config "$TMPFILE"

check if this is simply an ELF file

else off=$binoffset "$image" $ELFHDR 2>/dev/null [ "$?" != "0" ] && off="-1" if [ "$off" -eq "0" ]; then dump_config "$image" fi fi

echo "ERROR: Unable to extract kernel configuration information." echo " This kernel image may not have the config info."

clean_up exit 1

1.9 KiB Executable File Raw Blame History