1 | /* Special .init and .fini section support for ARM. |
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 | /* Always build .init and .fini sections in ARM mode. */ |
42 | #define NO_THUMB |
43 | #include <libc-symbols.h> |
44 | #include <sysdep.h> |
45 | |
46 | #ifndef PREINIT_FUNCTION |
47 | # define PREINIT_FUNCTION __gmon_start__ |
48 | #endif |
49 | |
50 | #ifndef PREINIT_FUNCTION_WEAK |
51 | # define PREINIT_FUNCTION_WEAK 1 |
52 | #endif |
53 | |
54 | #if PREINIT_FUNCTION_WEAK |
55 | weak_extern (PREINIT_FUNCTION) |
56 | #else |
57 | .hidden PREINIT_FUNCTION |
58 | #endif |
59 | |
60 | #if PREINIT_FUNCTION_WEAK |
61 | .p2align 2 |
62 | .type call_weak_fn, %function |
63 | call_weak_fn: |
64 | ldr r3, .LGOT |
65 | ldr r2, .LGOT+4 |
66 | .LPIC: |
67 | add r3, pc, r3 |
68 | ldr r2, [r3, r2] |
69 | cmp r2, #0 |
70 | bxeq lr |
71 | b PREINIT_FUNCTION |
72 | .p2align 2 |
73 | .LGOT: |
74 | .word _GLOBAL_OFFSET_TABLE_-(.LPIC+8) |
75 | .word PREINIT_FUNCTION(GOT) |
76 | #endif |
77 | |
78 | .section .init,"ax" ,%progbits |
79 | .p2align 2 |
80 | .globl _init |
81 | .hidden _init |
82 | .type _init, %function |
83 | _init: |
84 | push {r3, lr} |
85 | #if PREINIT_FUNCTION_WEAK |
86 | bl call_weak_fn |
87 | #else |
88 | bl PREINIT_FUNCTION |
89 | #endif |
90 | |
91 | .section .fini,"ax" ,%progbits |
92 | .p2align 2 |
93 | .globl _fini |
94 | .hidden _fini |
95 | .type _fini, %function |
96 | _fini: |
97 | push {r3, lr} |
98 | |