167811Sobrien/*-
296171Sobrien * Copyright 2000 David E. O'Brien, John D. Polstra.
367811Sobrien * All rights reserved.
467811Sobrien *
567811Sobrien * Redistribution and use in source and binary forms, with or without
667811Sobrien * modification, are permitted provided that the following conditions
767811Sobrien * are met:
867811Sobrien * 1. Redistributions of source code must retain the above copyright
967811Sobrien *    notice, this list of conditions and the following disclaimer.
1067811Sobrien * 2. Redistributions in binary form must reproduce the above copyright
1167811Sobrien *    notice, this list of conditions and the following disclaimer in the
1267811Sobrien *    documentation and/or other materials provided with the distribution.
1367811Sobrien *
1467811Sobrien * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
1567811Sobrien * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
1667811Sobrien * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
1767811Sobrien * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
1867811Sobrien * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
1967811Sobrien * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
2067811Sobrien * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
2167811Sobrien * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
2267811Sobrien * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
2367811Sobrien * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
2467811Sobrien */
2567811Sobrien
26114666Sobrien#include <sys/cdefs.h>
27114666Sobrien__FBSDID("$FreeBSD$");
28114666Sobrien
2967811Sobrien#include <sys/param.h>
3067811Sobrien
3167811Sobrien#define ABI_VENDOR	"FreeBSD"
3267811Sobrien#define ABI_SECTION	".note.ABI-tag"
3367811Sobrien#define ABI_NOTETYPE	1
3467811Sobrien
3567811Sobrien/*
3667811Sobrien * Special ".note" entry specifying the ABI version.  See
3767811Sobrien * http://www.netbsd.org/Documentation/kernel/elf-notes.html
3867811Sobrien * for more information.
39217375Sdim *
40217375Sdim * For all arches except sparc, gcc emits the section directive for the
41217375Sdim * following struct with a PROGBITS type.  However, newer versions of binutils
42217375Sdim * (after 2.16.90) require the section to be of NOTE type, to guarantee that the
43217375Sdim * .note.ABI-tag section correctly ends up in the first page of the final
44217375Sdim * executable.
45217375Sdim *
46217375Sdim * Unfortunately, there is no clean way to tell gcc to use another section type,
47217375Sdim * so this C file (or the C file that includes it) must be compiled in multiple
48217375Sdim * steps:
49217375Sdim *
50217375Sdim * - Compile the .c file to a .s file.
51217375Sdim * - Edit the .s file to change the 'progbits' type to 'note', for the section
52217375Sdim *   directive that defines the .note.ABI-tag section.
53217375Sdim * - Compile the .s file to an object file.
54217375Sdim *
55217375Sdim * These steps are done in the invididual Makefiles for each applicable arch.
5667811Sobrien */
5767811Sobrienstatic const struct {
5867811Sobrien    int32_t	namesz;
5967811Sobrien    int32_t	descsz;
6067811Sobrien    int32_t	type;
6167811Sobrien    char	name[sizeof ABI_VENDOR];
6267811Sobrien    int32_t	desc;
63174251Skib} abitag __attribute__ ((section (ABI_SECTION), aligned(4))) __used = {
6467811Sobrien    sizeof ABI_VENDOR,
6567811Sobrien    sizeof(int32_t),
6667811Sobrien    ABI_NOTETYPE,
6767811Sobrien    ABI_VENDOR,
68268511Sgjb    903000
6967811Sobrien};
70