1/* Special .init and .fini section support for x86.
2   Copyright (C) 1995-2022 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 GNU 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   Note that people who make modified versions of this file are not
20   obligated to grant this special exception for their modified
21   versions; it is their choice whether to do so. The GNU Lesser
22   General Public License gives permission to release a modified
23   version without this exception; this exception also makes it
24   possible to release a modified version which carries forward this
25   exception.
26
27   The GNU C Library is distributed in the hope that it will be useful,
28   but WITHOUT ANY WARRANTY; without even the implied warranty of
29   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
30   Lesser General Public License for more details.
31
32   You should have received a copy of the GNU Lesser General Public
33   License along with the GNU C Library; if not, see
34   <https://www.gnu.org/licenses/>.  */
35
36/* crti.S puts a function prologue at the beginning of the .init and
37   .fini sections and defines global symbols for those addresses, so
38   they can be called as functions.  The symbols _init and _fini are
39   magic and cause the linker to emit DT_INIT and DT_FINI.  */
40
41#include <libc-symbols.h>
42#include <sysdep.h>
43
44#ifndef PREINIT_FUNCTION
45# define PREINIT_FUNCTION __gmon_start__
46#endif
47
48#ifndef PREINIT_FUNCTION_WEAK
49# define PREINIT_FUNCTION_WEAK 1
50#endif
51
52#if PREINIT_FUNCTION_WEAK
53	weak_extern (PREINIT_FUNCTION)
54#else
55	.hidden PREINIT_FUNCTION
56#endif
57
58	.section .init,"ax",@progbits
59	.p2align 2
60	.globl _init
61	.hidden	_init
62	.type _init, @function
63_init:
64	_CET_ENDBR
65	pushl %ebx
66	/* Maintain 16-byte stack alignment for called functions.  */
67	subl $8, %esp
68	LOAD_PIC_REG (bx)
69#if PREINIT_FUNCTION_WEAK
70	movl PREINIT_FUNCTION@GOT(%ebx), %eax
71	testl %eax, %eax
72	je .Lno_weak_fn
73	call *%eax
74.Lno_weak_fn:
75#else
76	call PREINIT_FUNCTION
77#endif
78
79	.section .fini,"ax",@progbits
80	.p2align 2
81	.globl _fini
82	.hidden	_fini
83	.type _fini, @function
84_fini:
85	_CET_ENDBR
86	pushl %ebx
87	subl $8, %esp
88	LOAD_PIC_REG (bx)
89