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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/sys/tools/amd64_vdso.sh
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#!/bin/sh

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# SPDX-License-Identifier: BSD-2-Clause

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#

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# Copyright (c) 2021 The FreeBSD Foundation

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# All rights reserved.

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#

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# This software was developed by Konstantin Belousov <[email protected]>

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# under sponsorship from the FreeBSD Foundation.

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#

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# Redistribution and use in source and binary forms, with or without

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# modification, are permitted provided that the following conditions

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# are met:

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# 1. Redistributions of source code must retain the above copyright

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#    notice, this list of conditions and the following disclaimer.

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# 2. Redistributions in binary form must reproduce the above copyright

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#    notice, this list of conditions and the following disclaimer in the

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#    documentation and/or other materials provided with the distribution.

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#

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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND

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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

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# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

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# SUCH DAMAGE.

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set -e

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${CC} -x assembler-with-cpp -DLOCORE -fPIC -nostdinc -c \

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   -o sigtramp.pico -I. -I"${S}" -include opt_global.h \

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   "${S}"/amd64/amd64/sigtramp.S

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# We need to make vdso as compact as possible, for it to leave space

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# for other things in the shared page.  For this, we pack everything

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# into single loadable segment.

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#

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# -z rodynamic is undocumented lld-specific option, seemingly required

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# for lld to avoid putting dynamic into dedicated writeable segment,

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# despite ldscript placement.  It is omitted for ld.bfd, but ldscript

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# alone is enough there.

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#

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if ${LD} --version | ${AWK} '/^GNU ld/{exit 1}' ; then

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    RODYNAMIC="-z rodynamic"

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else

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    RODYNAMIC=""

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fi

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${LD} --shared -Bsymbolic -soname="elf-vdso.so.1" \

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   -T "${S}"/conf/vdso_amd64.ldscript \

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   --eh-frame-hdr --no-undefined ${RODYNAMIC} -z norelro -nmagic \

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   --hash-style=sysv --fatal-warnings --strip-all \

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   -o elf-vdso.so.1 sigtramp.pico

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if [ "$(wc -c elf-vdso.so.1 | ${AWK} '{print $1}')" -gt 2048 ]

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then

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    echo "elf-vdso.so.1 too large" 1>&2

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    exit 1

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fi

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if [ -n "$(${ELFDUMP} -d elf-vdso.so.1 | \

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  ${AWK} '/DT_REL.*SZ/{print "RELOCS"}')" ]

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then

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    echo "elf-vdso.so.1 contains runtime relocations" 1>&2

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    exit 1

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fi

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${CC} -x assembler-with-cpp -DLOCORE -fPIC -nostdinc -c \

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   -o elf-vdso.so.o -I. -I"${S}" -include opt_global.h \

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   -DVDSO_NAME=elf_vdso_so_1 -DVDSO_FILE=\"elf-vdso.so.1\" \

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   "${S}"/tools/vdso_wrap.S

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${NM} -D elf-vdso.so.1 | \

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   ${AWK} '/__vdso_sigcode/{printf "#define VDSO_SIGCODE_OFFSET 0x%s\n",$1}' \

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   >vdso_offsets.h

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