1/* Special .init and .fini section support for MIPS (o32).
2 Copyright (C) 1995-2024 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
43#ifdef __mips_micromips
44# define JALR_RELOC R_MICROMIPS_JALR
45#else
46# define JALR_RELOC R_MIPS_JALR
47#endif
48
49#ifndef PREINIT_FUNCTION
50# define PREINIT_FUNCTION __gmon_start__
51#endif
52
53#ifndef PREINIT_FUNCTION_WEAK
54# define PREINIT_FUNCTION_WEAK 1
55#endif
56
57#if PREINIT_FUNCTION_WEAK
58 weak_extern (PREINIT_FUNCTION)
59#else
60 .hidden PREINIT_FUNCTION
61#endif
62
63 .set nomips16
64
65 .section .init,"ax",@progbits
66 .p2align 2
67 .globl _init
68 .hidden _init
69 .type _init, @function
70_init:
71 .set noreorder
72 .cpload $25
73 .set reorder
74 addiu $sp,$sp,-32
75 .cprestore 16
76 sw $31,28($sp)
77#if PREINIT_FUNCTION_WEAK
78 lw $2,%got(PREINIT_FUNCTION)($28)
79 beq $2,$0,.Lno_weak_fn
80 lw $25,%call16(PREINIT_FUNCTION)($28)
81 .reloc 1f,JALR_RELOC,PREINIT_FUNCTION
821: jalr $25
83.Lno_weak_fn:
84 .insn
85#else
86 lw $25,%got(PREINIT_FUNCTION)($28)
87 .reloc 1f,JALR_RELOC,PREINIT_FUNCTION
881: jalr $25
89#endif
90
91 .section .fini,"ax",@progbits
92 .p2align 2
93 .globl _fini
94 .hidden _fini
95 .type _fini, @function
96_fini:
97 .set noreorder
98 .cpload $25
99 .set reorder
100 addiu $sp,$sp,-32
101 .cprestore 16
102 sw $31,28($sp)
103

source code of glibc/sysdeps/mips/mips32/crti.S