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 |
82 | 1: jalr $25 |
83 | .Lno_weak_fn: |
84 | .insn |
85 | #else |
86 | lw $25,%got(PREINIT_FUNCTION)($28) |
87 | .reloc 1f,JALR_RELOC,PREINIT_FUNCTION |
88 | 1: 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 | |