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head/sys/tools/embed_mfs.sh

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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE. # SUCH DAMAGE.
# #
# $FreeBSD$ # $FreeBSD$
# #
# Embed the MFS image into the kernel body (expects space reserved via # Embed an MFS image into the kernel body or the loader body (expects space
# MD_ROOT_SIZE) # reserved via MD_ROOT_SIZE (kernel) or MD_IMAGE_SIZE (loader))
# #
# $1: kernel filename # $1: kernel or loader filename
# $2: MFS image filename # $2: MFS image filename
# #
if [ $# -ne 2 ]; then if [ $# -ne 2 ]; then
echo "usage: $(basename $0) target mfs_image" echo "usage: $(basename $0) target mfs_image"
exit 0 exit 0
fi fi
if [ ! -w "$1" ]; then if [ ! -w "$1" ]; then
echo $1 not writable echo $1 not writable
exit 1 exit 1
fi fi
mfs_size=`stat -f '%z' $2 2> /dev/null` mfs_size=`stat -f '%z' $2 2> /dev/null`
# If we can't determine MFS image size - bail. # If we can't determine MFS image size - bail.
[ -z ${mfs_size} ] && echo "Can't determine MFS image size" && exit 1 [ -z ${mfs_size} ] && echo "Can't determine MFS image size" && exit 1
err_no_mfs="Can't locate mfs section within "
if [ `file -b $1 | grep -q '^ELF ..-bit .SB executable'` ]; then
sec_info=`elfdump -c $1 2> /dev/null | grep -A 5 -E "sh_name: oldmfs$"` sec_info=`elfdump -c $1 2> /dev/null | grep -A 5 -E "sh_name: oldmfs$"`
# If we can't find the mfs section within the given kernel - bail. # If we can't find the mfs section within the given kernel - bail.
[ -z "${sec_info}" ] && echo "Can't locate mfs section within $1" && exit 1 [ -z "${sec_info}" ] && echo "${err_no_mfs} $1" && exit 1
sec_size=`echo "${sec_info}" | awk '/sh_size/ {print $2}' 2> /dev/null` sec_size=`echo "${sec_info}" | awk '/sh_size/ {print $2}' 2>/dev/null`
sec_start=`echo "${sec_info}" | awk '/sh_offset/ {print $2}' 2> /dev/null` sec_start=`echo "${sec_info}" | \
awk '/sh_offset/ {print $2}' 2>/dev/null`
else
#try to find start byte of MFS start flag otherwise - bail.
sec_start=`strings -at d $1 | grep "MFS Filesystem goes here"` || \
{ echo "${err_no_mfs} $1"; exit 1; }
sec_start=`echo ${sec_start} | awk '{print $1}'`
#try to find start byte of MFS end flag otherwise - bail.
sec_end=`strings -at d $1 | \
grep "MFS Filesystem had better STOP here"` || \
{ echo "${err_no_mfs} $1"; exit 1; }
sec_end=`echo ${sec_end} | awk '{print $1}'`
#calculate MFS section size
sec_size=`expr ${sec_end} - ${sec_start}`
fi
# If the mfs section size is smaller than the mfs image - bail. # If the mfs section size is smaller than the mfs image - bail.
[ ${sec_size} -lt ${mfs_size} ] && echo "MFS image too large" && exit 1 [ ${sec_size} -lt ${mfs_size} ] && echo "MFS image too large" && exit 1
# Dump the mfs image into the mfs section # Dump the mfs image into the mfs section
dd if=$2 ibs=8192 of=$1 obs=${sec_start} oseek=1 conv=notrunc 2> /dev/null && \ dd if=$2 ibs=8192 of=$1 obs=${sec_start} oseek=1 conv=notrunc 2> /dev/null && \
echo "MFS image embedded into kernel" && exit 0 echo "MFS image embedded into $1" && exit 0