| #!/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 - $start" |
| |
| head --bytes="$end" "$file" | tail --bytes="$size" | 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 |