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92e47068 | 1 | /* Special .init and .fini section support for ARM. |
04277e02 | 2 | Copyright (C) 1995-2019 Free Software Foundation, Inc. |
233db6e8 DJ |
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 | |
ab84e3ff PE |
33 | License along with the GNU C Library. If not, see |
34 | <http://www.gnu.org/licenses/>. */ | |
233db6e8 | 35 | |
92e47068 JM |
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. */ | |
233db6e8 | 40 | |
365261c3 RH |
41 | /* Always build .init and .fini sections in ARM mode. */ |
42 | #define NO_THUMB | |
92e47068 JM |
43 | #include <libc-symbols.h> |
44 | #include <sysdep.h> | |
233db6e8 | 45 | |
92e47068 JM |
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 | |
67c05796 | 81 | .hidden _init |
92e47068 JM |
82 | .type _init, %function |
83 | _init: | |
55668624 | 84 | push {r3, lr} |
92e47068 JM |
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 | |
67c05796 | 94 | .hidden _fini |
92e47068 JM |
95 | .type _fini, %function |
96 | _fini: | |
55668624 | 97 | push {r3, lr} |