| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 1 | /* Special .init and .fini section support. |
| 2 | Copyright (C) 1997-2016 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 */ |