1#!/bin/sh 2# SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3# 4# Copyright (c) 2021 The FreeBSD Foundation 5# All rights reserved. 6# 7# This software was developed by Konstantin Belousov <kib@FreeBSD.org> 8# under sponsorship from the FreeBSD Foundation. 9# 10# Redistribution and use in source and binary forms, with or without 11# modification, are permitted provided that the following conditions 12# are met: 13# 1. Redistributions of source code must retain the above copyright 14# notice, this list of conditions and the following disclaimer. 15# 2. Redistributions in binary form must reproduce the above copyright 16# notice, this list of conditions and the following disclaimer in the 17# documentation and/or other materials provided with the distribution. 18# 19# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29# SUCH DAMAGE. 30 31set -e 32 33${CC} -x assembler-with-cpp -DLOCORE -fPIC -nostdinc -c \ 34 -o sigtramp.pico -I. -I"${S}" -include opt_global.h \ 35 "${S}"/amd64/amd64/sigtramp.S 36 37# We need to make vdso as compact as possible, for it to leave space 38# for other things in the shared page. For this, we pack everything 39# into single loadable segment. 40# 41# -z rodynamic is undocumented lld-specific option, seemingly required 42# for lld to avoid putting dynamic into dedicated writeable segment, 43# despite ldscript placement. It is ignored by ld.bfd but ldscript 44# alone is enough there. 45# 46${LD} --shared -Bsymbolic -soname="elf-vdso.so.1" \ 47 -T "${S}"/conf/vdso_amd64.ldscript \ 48 --eh-frame-hdr --no-undefined -z rodynamic -z norelro -nmagic \ 49 --hash-style=sysv --fatal-warnings --strip-all \ 50 -o elf-vdso.so.1 sigtramp.pico 51 52if [ "$(wc -c elf-vdso.so.1 | ${AWK} '{print $1}')" -gt 2048 ] 53then 54 echo "elf-vdso.so.1 too large" 1>&2 55 exit 1 56fi 57 58if [ -n "$(${ELFDUMP} -d elf-vdso.so.1 | \ 59 ${AWK} '/DT_REL.*SZ/{print "RELOCS"}')" ] 60then 61 echo "elf-vdso.so.1 contains runtime relocations" 1>&2 62 exit 1 63fi 64 65${CC} ${DEBUG} -x assembler-with-cpp -DLOCORE -fPIC -nostdinc -c \ 66 -o elf-vdso.so.o -I. -I"${S}" -include opt_global.h \ 67 -DVDSO_NAME=elf_vdso_so_1 -DVDSO_FILE=elf-vdso.so.1 \ 68 "${S}"/tools/vdso_wrap.S 69 70${NM} -D elf-vdso.so.1 | \ 71 ${AWK} '/__vdso_sigcode/{printf "#define VDSO_SIGCODE_OFFSET 0x%s\n",$1}' \ 72 >vdso_offsets.h 73