1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright 2000 David E. O'Brien, John D. Polstra.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD$");
30
31#include <sys/param.h>
32#include <sys/elf_common.h>
33#include "notes.h"
34
35/*
36 * Special ".note" entry specifying the ABI version.  See
37 * http://www.netbsd.org/Documentation/kernel/elf-notes.html
38 * for more information.
39 *
40 * For all arches except sparc, gcc emits the section directive for the
41 * following struct with a PROGBITS type.  However, newer versions of binutils
42 * (after 2.16.90) require the section to be of NOTE type, to guarantee that the
43 * .note.ABI-tag section correctly ends up in the first page of the final
44 * executable.
45 *
46 * Unfortunately, there is no clean way to tell gcc to use another section type,
47 * so this C file (or the C file that includes it) must be compiled in multiple
48 * steps:
49 *
50 * - Compile the .c file to a .s file.
51 * - Edit the .s file to change the 'progbits' type to 'note', for the section
52 *   directive that defines the .note.ABI-tag section.
53 * - Compile the .s file to an object file.
54 *
55 * These steps are done in the invididual Makefiles for each applicable arch.
56 */
57static const struct {
58	int32_t	namesz;
59	int32_t	descsz;
60	int32_t	type;
61	char	name[sizeof(NOTE_FREEBSD_VENDOR)];
62	int32_t	desc;
63} abitag __attribute__ ((section (NOTE_SECTION), aligned(4))) __used = {
64	.namesz = sizeof(NOTE_FREEBSD_VENDOR),
65	.descsz = sizeof(int32_t),
66	.type = NT_FREEBSD_ABI_TAG,
67	.name = NOTE_FREEBSD_VENDOR,
68	.desc = __FreeBSD_version
69};
70
71static const struct {
72	int32_t	namesz;
73	int32_t	descsz;
74	int32_t	type;
75	char	name[sizeof(NOTE_FREEBSD_VENDOR)];
76	uint32_t	desc[1];
77} crt_feature_ctl __attribute__ ((section (NOTE_SECTION),
78    aligned(4))) __used = {
79	.namesz = sizeof(NOTE_FREEBSD_VENDOR),
80	.descsz = sizeof(uint32_t),
81	.type = NT_FREEBSD_FEATURE_CTL,
82	.name = NOTE_FREEBSD_VENDOR,
83	.desc = { 0 }
84};
85