1#!/bin/sh 2 3# SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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# $FreeBSD$ 30 31usage() 32{ 33 echo "usage: genoffset [-o outfile] objfile" 34 exit 1 35} 36 37work() 38( 39 local last off x1 x2 x3 struct field type lastoff lasttype 40 41 echo "#ifndef _OFFSET_INC_" 42 echo "#define _OFFSET_INC_" 43 echo "#if !defined(GENOFFSET) && (!defined(KLD_MODULE) || defined(KLD_TIED))" 44 last= 45 temp=$(mktemp -d genoffset.XXXXXXXXXX) 46 trap "rm -rf ${temp}" EXIT 47 # Note: we need to print symbol values in decimal so the numeric sort works 48 ${NM:='nm'} ${NMFLAGS} -t d "$1" | grep __assym_offset__ | sed -e 's/__/ /g' | sort -k 4 -k 1 -n | 49 while read off x1 x2 struct field type x3; do 50 off=$(echo "$off" | sed -E 's/^0+//') 51 if [ "$last" != "$struct" ]; then 52 if [ -n "$last" ]; then 53 echo "};" 54 fi 55 echo "struct ${struct}_lite {" 56 last=$struct 57 printf "%b" "\tu_char\tpad_${field}[${off}];\n" 58 else 59 printf "%b" "\tu_char\tpad_${field}[${off} - (${lastoff} + sizeof(${lasttype}))];\n" 60 fi 61 printf "%b" "\t${type}\t${field};\n" 62 lastoff="$off" 63 lasttype="$type" 64 echo "_SA(${struct}, ${field}, ${off});" >> "$temp/asserts" 65 done 66 echo "};" 67 echo "#define _SA(s,f,o) _Static_assert(__builtin_offsetof(struct s ## _lite, f) == o, \\" 68 printf '\t"struct "#s"_lite field "#f" not at offset "#o)\n' 69 cat "$temp/asserts" 70 echo "#undef _SA" 71 echo "#endif" 72 echo "#endif" 73) 74 75 76# 77#MAIN PROGGRAM 78# 79use_outfile="no" 80while getopts "o:" option 81do 82 case "$option" in 83 o) outfile="$OPTARG" 84 use_outfile="yes";; 85 *) usage;; 86 esac 87done 88shift $((OPTIND - 1)) 89case $# in 901) ;; 91*) usage;; 92esac 93 94if [ "$use_outfile" = "yes" ] 95then 96 work "$1" 3>"$outfile" >&3 3>&- 97else 98 work "$1" 99fi 100 101