1#!/bin/sh
2#
3# SPDX-License-Identifier: BSD-2-Clause
4#
5# Copyright (C) 2008 The FreeBSD Project. All rights reserved.
6#
7# Redistribution and use in source and binary forms, with or without
8# modification, are permitted provided that the following conditions
9# are met:
10# 1. Redistributions of source code must retain the above copyright
11#   notice, this list of conditions and the following disclaimer.
12# 2. Redistributions in binary form must reproduce the above copyright
13#   notice, this list of conditions and the following disclaimer in the
14#   documentation and/or other materials provided with the distribution.
15#
16# THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19# ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
20# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26# SUCH DAMAGE.
27#
28#
29# Embed an MFS image into the kernel body or the loader body (expects space
30# reserved via MD_ROOT_SIZE (kernel) or MD_IMAGE_SIZE (loader))
31#
32# $1: kernel or loader filename
33# $2: MFS image filename
34#
35
36if [ $# -ne 2 ]; then
37	echo "usage: $(basename $0) target mfs_image"
38	exit 0
39fi
40if [ ! -w "$1" ]; then
41	echo $1 not writable
42	exit 1
43fi
44
45mfs_size=`stat -f '%z' $2 2> /dev/null`
46# If we can't determine MFS image size - bail.
47if [ -z ${mfs_size} ]; then
48	echo "Can't determine MFS image size"
49	exit 1
50fi
51
52err_no_mfs="Can't locate mfs section within "
53
54if file -b $1 | grep -q '^ELF ..-bit .SB executable'; then
55
56	sec_info=`elfdump -c $1 2> /dev/null | grep -A 5 -E "sh_name: oldmfs$"`
57	# If we can't find the mfs section within the given kernel - bail.
58	if [ -z "${sec_info}" ]; then
59		echo "${err_no_mfs} $1"
60		exit 1
61	fi
62
63	sec_size=`echo "${sec_info}" | awk '/sh_size/ {print $2}' 2>/dev/null`
64	sec_start=`echo "${sec_info}" | \
65	    awk '/sh_offset/ {print $2}' 2>/dev/null`
66
67else
68
69	#try to find start byte of MFS start flag otherwise - bail.
70	sec_start=`strings -at d $1 | grep "MFS Filesystem goes here"` || \
71	    { echo "${err_no_mfs} $1"; exit 1; }
72	sec_start=`echo ${sec_start} | awk '{print $1}'`
73
74	#try to find start byte of MFS end flag otherwise - bail.
75	sec_end=`strings -at d $1 | \
76	    grep "MFS Filesystem had better STOP here"` || \
77	    { echo "${err_no_mfs} $1"; exit 1; }
78	sec_end=`echo ${sec_end} | awk '{print $1}'`
79
80	#calculate MFS section size
81	sec_size=`expr ${sec_end} - ${sec_start}`
82
83fi
84
85# If the mfs section size is smaller than the mfs image - bail.
86if [ ${sec_size} -lt ${mfs_size} ]; then
87	echo "MFS image too large"
88	exit 1
89fi
90
91# Dump the mfs image into the mfs section
92dd if=$2 ibs=8192 of=$1 obs=${sec_start} oseek=1 conv=notrunc 2> /dev/null && \
93    echo "MFS image embedded into $1" && exit 0
94