1#!/bin/sh
2#
3# Copyright (C) 2008 The FreeBSD Project. All rights reserved.
4#
5# Redistribution and use in source and binary forms, with or without
6# modification, are permitted provided that the following conditions
7# are met:
8# 1. Redistributions of source code must retain the above copyright
9#   notice, this list of conditions and the following disclaimer.
10# 2. Redistributions in binary form must reproduce the above copyright
11#   notice, this list of conditions and the following disclaimer in the
12#   documentation and/or other materials provided with the distribution.
13#
14# THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17# ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
18# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24# SUCH DAMAGE.
25#
26# $FreeBSD: stable/11/sys/tools/embed_mfs.sh 331691 2018-03-28 17:19:04Z emaste $ 
27#
28# Embed an MFS image into the kernel body or the loader body (expects space
29# reserved via MD_ROOT_SIZE (kernel) or MD_IMAGE_SIZE (loader))
30#
31# $1: kernel or loader filename
32# $2: MFS image filename
33#
34
35if [ $# -ne 2 ]; then
36	echo "usage: $(basename $0) target mfs_image"
37	exit 0
38fi
39if [ ! -w "$1" ]; then
40	echo $1 not writable
41	exit 1
42fi
43
44mfs_size=`stat -f '%z' $2 2> /dev/null`
45# If we can't determine MFS image size - bail.
46[ -z ${mfs_size} ] && echo "Can't determine MFS image size" && exit 1
47
48err_no_mfs="Can't locate mfs section within "
49
50if file -b $1 | grep -q '^ELF ..-bit .SB executable'; then
51
52	sec_info=`elfdump -c $1 2> /dev/null | grep -A 5 -E "sh_name: oldmfs$"`
53	# If we can't find the mfs section within the given kernel - bail.
54	[ -z "${sec_info}" ] && echo "${err_no_mfs} $1" && exit 1
55
56	sec_size=`echo "${sec_info}" | awk '/sh_size/ {print $2}' 2>/dev/null`
57	sec_start=`echo "${sec_info}" | \
58	    awk '/sh_offset/ {print $2}' 2>/dev/null`
59
60else
61
62	#try to find start byte of MFS start flag otherwise - bail.
63	sec_start=`strings -at d $1 | grep "MFS Filesystem goes here"` || \
64	    { echo "${err_no_mfs} $1"; exit 1; }
65	sec_start=`echo ${sec_start} | awk '{print $1}'`
66
67	#try to find start byte of MFS end flag otherwise - bail.
68	sec_end=`strings -at d $1 | \
69	    grep "MFS Filesystem had better STOP here"` || \
70	    { echo "${err_no_mfs} $1"; exit 1; }
71	sec_end=`echo ${sec_end} | awk '{print $1}'`
72
73	#calculate MFS section size
74	sec_size=`expr ${sec_end} - ${sec_start}`
75
76fi
77
78# If the mfs section size is smaller than the mfs image - bail.
79[ ${sec_size} -lt ${mfs_size} ] && echo "MFS image too large" && exit 1
80
81# Dump the mfs image into the mfs section
82dd if=$2 ibs=8192 of=$1 obs=${sec_start} oseek=1 conv=notrunc 2> /dev/null && \
83    echo "MFS image embedded into $1" && exit 0
84