3 # SPDX-License-Identifier: BSD-2-Clause-FreeBSD
5 # Copyright (c) 2000, Bruce Evans <bde@freebsd.org>
6 # Copyright (c) 2018, Jeff Roberson <jeff@freebsd.org>
8 # Redistribution and use in source and binary forms, with or without
9 # modification, are permitted provided that the following conditions
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.
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
33 echo "usage: genoffset [-o outfile] objfile"
39 local last off x1 x2 x3 struct field type lastoff lasttype
41 echo "#ifndef _OFFSET_INC_"
42 echo "#define _OFFSET_INC_"
43 echo "#if !defined(GENOFFSET) && (!defined(KLD_MODULE) || defined(KLD_TIED))"
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
55 echo "struct ${struct}_lite {"
57 printf "%b" "\tu_char\tpad_${field}[${off}];\n"
59 printf "%b" "\tu_char\tpad_${field}[${off} - (${lastoff} + sizeof(${lasttype}))];\n"
61 printf "%b" "\t${type}\t${field};\n"
64 echo "_SA(${struct}, ${field}, ${off});" >> "$temp/asserts"
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'
80 while getopts "o:" option
94 if [ "$use_outfile" = "yes" ]
96 work "$1" 3>"$outfile" >&3 3>&-