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522e6ee3 | 1 | /* Special .init and .fini section support for Nios II. |
bfff8b1b | 2 | Copyright (C) 2012-2017 Free Software Foundation, Inc. |
522e6ee3 CLT |
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 | <http://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 | #ifndef PREINIT_FUNCTION | |
44 | # define PREINIT_FUNCTION __gmon_start__ | |
45 | #endif | |
46 | ||
47 | #ifndef PREINIT_FUNCTION_WEAK | |
48 | # define PREINIT_FUNCTION_WEAK 1 | |
49 | #endif | |
50 | ||
51 | #if PREINIT_FUNCTION_WEAK | |
52 | weak_extern (PREINIT_FUNCTION) | |
53 | #else | |
54 | .hidden PREINIT_FUNCTION | |
55 | #endif | |
56 | ||
57 | .section .init,"ax",@progbits | |
58 | .align 2 | |
59 | .global _init | |
60 | .type _init, @function | |
61 | _init: | |
62 | addi sp, sp, -8 | |
63 | stw r22, 0(sp) | |
64 | nextpc r22 | |
65 | 1: | |
66 | movhi r8, %hiadj(_gp_got - 1b) | |
67 | addi r8, r8, %lo(_gp_got - 1b) | |
68 | add r22, r22, r8 | |
69 | stw ra, 4(sp) | |
70 | #if PREINIT_FUNCTION_WEAK | |
71 | movhi r2, %got_hiadj(PREINIT_FUNCTION) | |
72 | addi r2, r2, %got_lo(PREINIT_FUNCTION) | |
73 | add r2, r2, r22 | |
74 | ldw r2, 0(r2) | |
75 | beq r2, zero, .L5 | |
76 | #endif | |
77 | movhi r2, %call_hiadj(PREINIT_FUNCTION) | |
78 | addi r2, r2, %call_lo(PREINIT_FUNCTION) | |
79 | add r2, r2, r22 | |
80 | ldw r2, 0(r2) | |
81 | callr r2 | |
82 | .L5: | |
83 | ||
84 | .section .fini,"ax",@progbits | |
85 | .align 2 | |
86 | .global _fini | |
87 | .type _fini, @function | |
88 | _fini: | |
89 | addi sp, sp, -8 | |
90 | stw r22, 0(sp) | |
91 | nextpc r22 | |
92 | 1: | |
93 | movhi r8, %hiadj(_gp_got - 1b) | |
94 | addi r8, r8, %lo(_gp_got - 1b) | |
95 | stw ra, 4(sp) | |
96 | add r22, r22, r8 |