1 | /* Special .init and .fini section support. |
2 | Copyright (C) 1997-2017 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | In addition to the permissions in the GNU Lesser General Public |
11 | License, the Free Software Foundation gives you unlimited |
12 | permission to link the compiled version of this file with other |
13 | programs, and to distribute those programs without any restriction |
14 | coming from the use of this file. (The Lesser General Public |
15 | License restrictions do apply in other respects; for example, they |
16 | cover modification of the file, and distribution when not linked |
17 | into another program.) |
18 | |
19 | The GNU C Library is distributed in the hope that it will be useful, |
20 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
22 | Lesser General Public License for more details. |
23 | |
24 | You should have received a copy of the GNU Lesser General Public |
25 | License along with the GNU C Library; if not, see |
26 | <http://www.gnu.org/licenses/>. */ |
27 | |
28 | /* Define an ELF note identifying the operating-system ABI that the |
29 | executable was created for. The ELF note information identifies a |
30 | particular OS or coordinated development effort within which the |
31 | ELF header's e_machine value plus (for dynamically linked programs) |
32 | the PT_INTERP dynamic linker name and DT_NEEDED shared library |
33 | names fully identify the runtime environment required by an |
34 | executable. |
35 | |
36 | The general format of ELF notes is as follows. |
37 | Offsets and lengths are bytes or (parenthetical references) to the |
38 | values in other fields. |
39 | |
40 | offset length contents |
41 | 0 4 length of name |
42 | 4 4 length of data |
43 | 8 4 note type |
44 | 12 (0) vendor name |
45 | - null-terminated ASCII string, padded to 4-byte alignment |
46 | 12+(0) (4) note data, |
47 | |
48 | The GNU project and cooperating development efforts (including the |
49 | Linux community) use note type 1 and a vendor name string of "GNU" |
50 | for a note descriptor that indicates ABI requirements. The note data |
51 | is four 32-bit words. The first of these is an operating system |
52 | number (0=Linux, 1=Hurd, 2=Solaris, ...) and the remaining three |
53 | identify the earliest release of that OS that supports this ABI. |
54 | See abi-tags (top level) for details. */ |
55 | |
56 | #include <config.h> |
57 | #include <abi-tag.h> /* OS-specific ABI tag value */ |
58 | |
59 | /* The linker (GNU ld 2.8 and later) recognizes an allocated section whose |
60 | name begins with `.note' and creates a PT_NOTE program header entry |
61 | pointing at it. */ |
62 | |
63 | .section ".note.ABI-tag" , "a" |
64 | .p2align 2 |
65 | .long 1f - 0f /* name length */ |
66 | .long 3f - 2f /* data length */ |
67 | .long 1 /* note type */ |
68 | 0: .asciz "GNU" /* vendor name */ |
69 | 1: .p2align 2 |
70 | 2: .long __ABI_TAG_OS /* note data: the ABI tag */ |
71 | .long __ABI_TAG_VERSION |
72 | 3: .p2align 2 /* pad out section */ |
73 | |