1#!/bin/sh 2 3# SPDX-License-Identifier: BSD-2-Clause 4# 5# Copyright (c) 2000, Bruce Evans <bde@freebsd.org> 6# Copyright (c) 2018, Jeff Roberson <jeff@freebsd.org> 7# 8# Redistribution and use in source and binary forms, with or without 9# modification, are permitted provided that the following conditions 10# are met: 11# 1. Redistributions of source code must retain the above copyright 12# notice, this list of conditions and the following disclaimer. 13# 2. Redistributions in binary form must reproduce the above copyright 14# notice, this list of conditions and the following disclaimer in the 15# documentation and/or other materials provided with the distribution. 16# 17# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27# SUCH DAMAGE. 28# 29 30usage() 31{ 32 echo "usage: genoffset [-o outfile] objfile" 33 exit 1 34} 35 36work() 37( 38 local last off x1 x2 x3 struct field type lastoff lasttype asserts 39 40 echo "#ifndef _OFFSET_INC_" 41 echo "#define _OFFSET_INC_" 42 echo "#if !defined(GENOFFSET) && (!defined(KLD_MODULE) || defined(KLD_TIED))" 43 last= 44 asserts= 45 while read off x1 x2 struct field type x3; do 46 off=$(echo "$off" | sed -E 's/^0+//') 47 if [ "$last" != "$struct" ]; then 48 if [ -n "$last" ]; then 49 echo "};" 50 fi 51 echo "struct ${struct}_lite {" 52 last=$struct 53 printf "%b" "\tu_char\tpad_${field}[${off}];\n" 54 else 55 printf "%b" "\tu_char\tpad_${field}[${off} - (${lastoff} + sizeof(${lasttype}))];\n" 56 fi 57 printf "%b" "\t${type}\t${field};\n" 58 lastoff="$off" 59 lasttype="$type" 60 asserts="${asserts}_SA(${struct}, ${field}, ${off});\n" 61 done <<EOT 62$(${NM:='nm'} ${NMFLAGS} -t d "$1" | grep __assym_offset__ | sed -e 's/__/ /g' | sort -k 4 -k 1 -n) 63EOT 64 echo "};" 65 echo "#define _SA(s,f,o) _Static_assert(__builtin_offsetof(struct s ## _lite, f) == o, \\" 66 printf '\t"struct "#s"_lite field "#f" not at offset "#o)\n' 67 printf "${asserts}" 68 echo "#undef _SA" 69 echo "#endif" 70 echo "#endif" 71) 72 73 74# 75#MAIN PROGGRAM 76# 77use_outfile="no" 78while getopts "o:" option 79do 80 case "$option" in 81 o) outfile="$OPTARG" 82 use_outfile="yes";; 83 *) usage;; 84 esac 85done 86shift $((OPTIND - 1)) 87case $# in 881) ;; 89*) usage;; 90esac 91 92if [ "$use_outfile" = "yes" ] 93then 94 work "$1" 3>"$outfile" >&3 3>&- 95else 96 work "$1" 97fi 98 99