b4764e4a0e
This makes it easier to grep the source tree for these notes, and ensures that they will remain in sync. Reviewed by: kib Approved by: re (gjb) MFC after: 1 week Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D17408
70 lines
2.7 KiB
C
70 lines
2.7 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright 2000 David E. O'Brien, John D. Polstra.
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* All rights reserved.
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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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/elf_common.h>
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#include "notes.h"
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/*
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* Special ".note" entry specifying the ABI version. See
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* http://www.netbsd.org/Documentation/kernel/elf-notes.html
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* for more information.
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*
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* For all arches except sparc, gcc emits the section directive for the
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* following struct with a PROGBITS type. However, newer versions of binutils
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* (after 2.16.90) require the section to be of NOTE type, to guarantee that the
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* .note.ABI-tag section correctly ends up in the first page of the final
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* executable.
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*
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* Unfortunately, there is no clean way to tell gcc to use another section type,
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* so this C file (or the C file that includes it) must be compiled in multiple
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* steps:
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*
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* - Compile the .c file to a .s file.
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* - Edit the .s file to change the 'progbits' type to 'note', for the section
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* directive that defines the .note.ABI-tag section.
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* - Compile the .s file to an object file.
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*
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* These steps are done in the invididual Makefiles for each applicable arch.
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*/
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static const struct {
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int32_t namesz;
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int32_t descsz;
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int32_t type;
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char name[sizeof(NOTE_FREEBSD_VENDOR)];
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int32_t desc;
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} abitag __attribute__ ((section (NOTE_SECTION), aligned(4))) __used = {
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.namesz = sizeof(NOTE_FREEBSD_VENDOR),
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.descsz = sizeof(int32_t),
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.type = NT_FREEBSD_ABI_TAG,
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.name = NOTE_FREEBSD_VENDOR,
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.desc = __FreeBSD_version
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};
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