Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

#!/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"

function dump_config {

    typeset 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`

    let start="$start + 8"

    let size="$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"

# 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"

fi

echo "ERROR: Unable to extract kernel configuration information."

echo "       This kernel image may not have the config info."

clean_up

exit 1