The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/tools/embed_mfs.sh

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    1 #!/bin/sh
    2 #
    3 # SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    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 # $FreeBSD: head/sys/tools/embed_mfs.sh 340082 2018-11-02 21:07:06Z emaste $ 
   29 #
   30 # Embed an MFS image into the kernel body or the loader body (expects space
   31 # reserved via MD_ROOT_SIZE (kernel) or MD_IMAGE_SIZE (loader))
   32 #
   33 # $1: kernel or loader filename
   34 # $2: MFS image filename
   35 #
   36 
   37 if [ $# -ne 2 ]; then
   38         echo "usage: $(basename $0) target mfs_image"
   39         exit 0
   40 fi
   41 if [ ! -w "$1" ]; then
   42         echo $1 not writable
   43         exit 1
   44 fi
   45 
   46 mfs_size=`stat -f '%z' $2 2> /dev/null`
   47 # If we can't determine MFS image size - bail.
   48 if [ -z ${mfs_size} ]; then
   49         echo "Can't determine MFS image size"
   50         exit 1
   51 fi
   52 
   53 err_no_mfs="Can't locate mfs section within "
   54 
   55 if file -b $1 | grep -q '^ELF ..-bit .SB executable'; then
   56 
   57         sec_info=`elfdump -c $1 2> /dev/null | grep -A 5 -E "sh_name: oldmfs$"`
   58         # If we can't find the mfs section within the given kernel - bail.
   59         if [ -z "${sec_info}" ]; then
   60                 echo "${err_no_mfs} $1"
   61                 exit 1
   62         fi
   63 
   64         sec_size=`echo "${sec_info}" | awk '/sh_size/ {print $2}' 2>/dev/null`
   65         sec_start=`echo "${sec_info}" | \
   66             awk '/sh_offset/ {print $2}' 2>/dev/null`
   67 
   68 else
   69 
   70         #try to find start byte of MFS start flag otherwise - bail.
   71         sec_start=`strings -at d $1 | grep "MFS Filesystem goes here"` || \
   72             { echo "${err_no_mfs} $1"; exit 1; }
   73         sec_start=`echo ${sec_start} | awk '{print $1}'`
   74 
   75         #try to find start byte of MFS end flag otherwise - bail.
   76         sec_end=`strings -at d $1 | \
   77             grep "MFS Filesystem had better STOP here"` || \
   78             { echo "${err_no_mfs} $1"; exit 1; }
   79         sec_end=`echo ${sec_end} | awk '{print $1}'`
   80 
   81         #calculate MFS section size
   82         sec_size=`expr ${sec_end} - ${sec_start}`
   83 
   84 fi
   85 
   86 # If the mfs section size is smaller than the mfs image - bail.
   87 if [ ${sec_size} -lt ${mfs_size} ]; then
   88         echo "MFS image too large"
   89         exit 1
   90 fi
   91 
   92 # Dump the mfs image into the mfs section
   93 dd if=$2 ibs=8192 of=$1 obs=${sec_start} oseek=1 conv=notrunc 2> /dev/null && \
   94     echo "MFS image embedded into $1" && exit 0

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