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/* Special .init and .fini section support.
Copyright (C) 1997-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
In addition to the permissions in the GNU Lesser General Public
License, the Free Software Foundation gives you unlimited
permission to link the compiled version of this file with other
programs, and to distribute those programs without any restriction
coming from the use of this file. (The Lesser General Public
License restrictions do apply in other respects; for example, they
cover modification of the file, and distribution when not linked
into another program.)
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
/* Define an ELF note identifying the operating-system ABI that the
executable was created for. The ELF note information identifies a
particular OS or coordinated development effort within which the
ELF header's e_machine value plus (for dynamically linked programs)
the PT_INTERP dynamic linker name and DT_NEEDED shared library
names fully identify the runtime environment required by an
executable.
The general format of ELF notes is as follows.
Offsets and lengths are bytes or (parenthetical references) to the
values in other fields.
offset length contents
0 4 length of name
4 4 length of data
8 4 note type
12 (0) vendor name
- null-terminated ASCII string, padded to 4-byte alignment
12+(0) (4) note data,
The GNU project and cooperating development efforts (including the
Linux community) use note type 1 and a vendor name string of "GNU"
for a note descriptor that indicates ABI requirements. The note data
is four 32-bit words. The first of these is an operating system
number (0=Linux, 1=Hurd, 2=Solaris, ...) and the remaining three
identify the earliest release of that OS that supports this ABI.
See abi-tags (top level) for details. */
#include <link.h>
#include <stdint.h>
#include <config.h>
#include <abi-tag.h> /* OS-specific ABI tag value */
/* The linker (GNU ld 2.8 and later) recognizes an allocated section whose
name begins with `.note' and creates a PT_NOTE program header entry
pointing at it. */
__attribute__ ((used, aligned (4), section (".note.ABI-tag")))
static const struct
{
ElfW(Nhdr) nhdr;
char name[4];
int32_t desc[4];
} __abi_tag = {
{ .n_namesz = sizeof __abi_tag.name,
.n_descsz = sizeof __abi_tag.desc,
.n_type = 1 },
"GNU",
{ __ABI_TAG_OS, __ABI_TAG_VERSION }
};
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