169b368a62
Not doing so results in ctfconvert failing with ERROR: ctfconvert: elf-vdso.so.o doesn't have type data to convert On FreeBSD this is non-fatal, since the ctf tools have a hack to make such errors not fail the build and instead just silently continue without CTF data (which is a bad idea these days and should probably be removed; they date back to the original import). However, those are under #ifdef __FreeBSD__ so do not apply when cross-building from non-FreeBSD, causing the build to fail. Fix this by forwarding DEBUG on to the compiler invocation for the VDSO wrapper. It's assembly so it's not hugely useful, but there is a non-zero amount of information preserved, and other assembly files are built with -g by default too so this matches them; the alternative would be to tag the files.amd64 entries with no-ctfmerge. Note that the VDSO itself is still compiled without debug info, this only affects the wrapper linked into the kernel. Fixes:98c8b62524("vdso for ia32 on amd64"),ab4524b3d7("amd64: wrap 64bit sigtramp into vdso") MFC after: 1 month
73 lines
2.9 KiB
Bash
73 lines
2.9 KiB
Bash
#!/bin/sh
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# SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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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 <kib@FreeBSD.org>
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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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"${S}"/amd64/amd64/sigtramp.S
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# We need to make vdso as compact as possible, for it to leave space
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# for other things in the shared page. For this, we pack everything
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# into single loadable segment.
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#
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# -z rodynamic is undocumented lld-specific option, seemingly required
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# for lld to avoid putting dynamic into dedicated writeable segment,
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# despite ldscript placement. It is ignored by ld.bfd but ldscript
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# alone is enough there.
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#
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${LD} --shared -Bsymbolic -soname="elf-vdso.so.1" \
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-T "${S}"/conf/vdso_amd64.ldscript \
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--eh-frame-hdr --no-undefined -z rodynamic -z norelro -nmagic \
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--hash-style=sysv --fatal-warnings --strip-all \
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-o elf-vdso.so.1 sigtramp.pico
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if [ "$(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} ${DEBUG} -x assembler-with-cpp -DLOCORE -fPIC -nostdinc -c \
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-o elf-vdso.so.o -I. -I"${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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