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: releng/11.1/sys/tools/embed_mfs.sh 312082 2017-01-13 19:22:22Z lwhsu $ 
   27 #
   28 # Embed the MFS image into the kernel body (expects space reserved via 
   29 # MD_ROOT_SIZE)
   30 #
   31 # $1: kernel filename
   32 # $2: MFS image filename
   33 #
   34 
   35 mfs_size=`stat -f '%z' $2 2> /dev/null`
   36 # If we can't determine MFS image size - bail.
   37 [ -z ${mfs_size} ] && echo "Can't determine MFS image size" && exit 1
   38 
   39 sec_info=`elfdump -c $1 2> /dev/null | grep -A 5 -E "sh_name: oldmfs$"`
   40 # If we can't find the mfs section within the given kernel - bail.
   41 [ -z "${sec_info}" ] && echo "Can't locate mfs section within kernel" && exit 1
   42 
   43 sec_size=`echo "${sec_info}" | awk '/sh_size/ {print $2}' 2> /dev/null`
   44 sec_start=`echo "${sec_info}" | awk '/sh_offset/ {print $2}' 2> /dev/null`
   45 
   46 # If the mfs section size is smaller than the mfs image - bail.
   47 [ ${sec_size} -lt ${mfs_size} ] && echo "MFS image too large" && exit 1
   48 
   49 # Dump the mfs image into the mfs section
   50 dd if=$2 ibs=8192 of=$1 obs=${sec_start} oseek=1 conv=notrunc 2> /dev/null && \
   51     echo "MFS image embedded into kernel" && exit 0

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