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 # 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 # $FreeBSD$ 
   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 
   35 if [ $# -ne 2 ]; then
   36         echo "usage: $(basename $0) target mfs_image"
   37         exit 0
   38 fi
   39 if [ ! -w "$1" ]; then
   40         echo $1 not writable
   41         exit 1
   42 fi
   43 
   44 mfs_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 
   48 err_no_mfs="Can't locate mfs section within "
   49 
   50 if 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 
   60 else
   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 
   76 fi
   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
   82 dd 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

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