FreeBSD/Linux Kernel Cross Reference
sys/kern/genoffset.sh

     #!/bin/sh
     
     # SPDX-License-Identifier: BSD-2-Clause-FreeBSD
     #
     # Copyright (c) 2000, Bruce Evans <bde@freebsd.org>
     # Copyright (c) 2018, Jeff Roberson <jeff@freebsd.org>
     #
     # Redistribution and use in source and binary forms, with or without
     # modification, are permitted provided that the following conditions
    # are met:
    # 1. Redistributions of source code must retain the above copyright
    #    notice, this list of conditions and the following disclaimer.
    # 2. Redistributions in binary form must reproduce the above copyright
    #    notice, this list of conditions and the following disclaimer in the
    #    documentation and/or other materials provided with the distribution.
    #
    # THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
    # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    # ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
    # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
    # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
    # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
    # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    # SUCH DAMAGE.
    #
    # $FreeBSD: releng/12.0/sys/kern/genoffset.sh 335880 2018-07-03 02:50:07Z mmacy $
    
    usage()
    {
            echo "usage: genoffset [-o outfile] objfile"
            exit 1
    }
    
    
    work()
    {
            echo "#ifndef _OFFSET_INC_"
            echo "#define _OFFSET_INC_"
            echo "#if !defined(GENOFFSET) && (!defined(KLD_MODULE) || defined(KLD_TIED))"
            ${NM:='nm'} ${NMFLAGS} "$1" | ${AWK:='awk'} '
            / C .*_datatype_*/ {
                    type = substr($3, match($3, "_datatype_") + length("_datatype_"))
            }
            / C .*_parenttype_*/ {
                    parent = substr($3, match($3, "_parenttype_") + length("_parenttype_"))
            }
            / C .*sign$/ {
                    sign = substr($1, length($1) - 3, 4)
                    sub("^0*", "", sign)
                    if (sign != "")
                            sign = "-"
            }
            / C .*w0$/ {
                    w0 = substr($1, length($1) - 3, 4)
            }
            / C .*w1$/ {
                    w1 = substr($1, length($1) - 3, 4)
            }
            / C .*w2$/ {
                    w2 = substr($1, length($1) - 3, 4)
            }
            / C .*w3$/ {
                    w3 = substr($1, length($1) - 3, 4)
                    w = w3 w2 w1 w0
                    sub("^0*", "", w)
                    if (w == "")
                            w = "0"
                    hex = ""
                    if (w != "0")
                            hex = "0x"
                    sub("w3$", "", $3)
                    member = tolower($3)
                    # This still has minor problems representing INT_MIN, etc. 
                    # E.g.,
                    # with 32-bit 2''s complement ints, this prints -0x80000000,
                    # which has the wrong type (unsigned int).
                    offset = sprintf("%s%s%s", sign, hex, w)
    
                    structures[parent] = sprintf("%s%s %s %s\n",
                        structures[parent], offset, type, member)
            }
            END {
                    for (struct in structures) {
                            printf("struct %s_lite {\n", struct);
                            n = split(structures[struct], members, "\n")
                            for (i = 1; i < n; i++) {
                                    for (j = i + 1; j < n; j++) {
                                            split(members[i], ivar, " ")
                                            split(members[j], jvar, " ")
                                            if (jvar[1] < ivar[1]) {
                                                    tmp = members[i]
                                                    members[i] = members[j]
                                                    members[j] = tmp
                                            }
                                    }
                            }
                           off = "0"
                           for (i = 1; i < n; i++) {
                                   split(members[i], m, " ")
                                   printf "\tu_char\tpad_%s[%s - %s];\n", m[3], m[1], off
                                   printf "\t%s\t%s;\n", m[2], m[3]
                                   off = sprintf("(%s + sizeof(%s))", m[1], m[2])
                           }
                           printf("};\n");
                   }
           }
           '
   
           echo "#endif"
           echo "#endif"
   }
   
   
   #
   #MAIN PROGGRAM
   #
   use_outfile="no"
   while getopts "o:" option
   do
           case "$option" in
           o)      outfile="$OPTARG"
                   use_outfile="yes";;
           *)      usage;;
           esac
   done
   shift $(($OPTIND - 1))
   case $# in
   1)      ;;
   *)      usage;;
   esac
   
   if [ "$use_outfile" = "yes" ]
   then
           work $1  3>"$outfile" >&3 3>&-
   else
           work $1
   fi
   

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