#!/bin/bash

# modify yours.
OBJDUMP=powerpc-linux-objdump

if [ -z $1 ]; then
	echo "usage: $0 zvmlinux_filename"
	exit 1;
fi

FILE=$1

OFFSET=`$OBJDUMP -h $FILE  | grep initrd | grep -v zvmlinux| awk '{print $6}'`
SIZE=`$OBJDUMP -h $FILE  | grep initrd | grep -v zvmlinux| awk '{print $3}'`

DECOFFSET=`printf "%d" "0x"$OFFSET`
DECSIZE=`printf "%d" "0x"$SIZE`
echo OFFSET $DECOFFSET
echo SIZE $DECSIZE

BOTTOM=`expr $DECOFFSET + $DECSIZE`
echo BOTTOM $BOTTOM

echo --- extract ---
head -c $BOTTOM $FILE | tail -c $DECSIZE - > ramdisk.image.gz
# dd bs=1 skip=$DECOFFSET count=$DECSIZE if=$FILE of=ramdisk.image.gz
echo --- done ---