csu: Add .note.ABI-tag and .note.GNU-stack
[dragonfly.git] / lib / csu / common / crtbrand.c
CommitLineData
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1/*-
2 * Copyright 1996, 1997, 1998, 2000 John D. Polstra.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 *
f4df8772 25 * $FreeBSD: src/lib/csu/common/crtbrand.c SVN 217375 2011/01/13 dim $
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26 */
27
28#include <sys/param.h>
29
ac794756 30#define ABI_VENDOR "DragonFly"
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31#define ABI_SECTION ".note.ABI-tag"
32#define ABI_NOTETYPE 1
33
34/*
35 * Special ".note" entry specifying the ABI version. See
36 * http://www.netbsd.org/Documentation/kernel/elf-notes.html
37 * for more information.
f4df8772
JM
38 *
39 * For all arches except sparc, gcc emits the section directive for the
40 * following struct with a PROGBITS type. However, newer versions of binutils
41 * (after 2.16.90) require the section to be of NOTE type, to guarantee that the
42 * .note.ABI-tag section correctly ends up in the first page of the final
43 * executable.
44 *
45 * Unfortunately, there is no clean way to tell gcc to use another section type,
46 * so this C file (or the C file that includes it) must be compiled in multiple
47 * steps:
48 *
49 * - Compile the .c file to a .s file.
50 * - Edit the .s file to change the 'progbits' type to 'note', for the section
51 * directive that defines the .note.ABI-tag section.
52 * - Compile the .s file to an object file.
53 *
54 * These steps are done in the individual Makefiles for each applicable arch.
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55 */
56static const struct {
57 int32_t namesz;
58 int32_t descsz;
59 int32_t type;
60 char name[sizeof ABI_VENDOR];
61 int32_t desc;
c5a70710 62} abitag __attribute__ ((section (ABI_SECTION))) __attribute__ ((used))= {
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63 sizeof ABI_VENDOR,
64 sizeof(int32_t),
65 ABI_NOTETYPE,
66 ABI_VENDOR,
e5a620e1 67 __DragonFly_version
984263bc 68};