1 | /* Special .init and .fini section support for PowerPC64. |
2 | Copyright (C) 2012-2024 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 | #include <sysdep.h> |
43 | |
44 | #ifndef PREINIT_FUNCTION |
45 | # define PREINIT_FUNCTION __gmon_start__ |
46 | #endif |
47 | |
48 | #ifndef PREINIT_FUNCTION_WEAK |
49 | # define PREINIT_FUNCTION_WEAK 1 |
50 | #endif |
51 | |
52 | #if PREINIT_FUNCTION_WEAK |
53 | weak_extern (PREINIT_FUNCTION) |
54 | #else |
55 | .hidden PREINIT_FUNCTION |
56 | #endif |
57 | |
58 | #if PREINIT_FUNCTION_WEAK |
59 | .section ".toc" , "aw" |
60 | .LC0: |
61 | .tc PREINIT_FUNCTION[TC], PREINIT_FUNCTION |
62 | #endif |
63 | .section ".init" , "ax" , @progbits |
64 | ENTRY_2(_init) |
65 | .hidden _init |
66 | .align ALIGNARG (2) |
67 | BODY_LABEL (_init): |
68 | LOCALENTRY(_init) |
69 | mflr 0 |
70 | std 0, FRAME_LR_SAVE(r1) |
71 | stdu r1, -FRAME_MIN_SIZE_PARM(r1) |
72 | #if PREINIT_FUNCTION_WEAK |
73 | addis r9, r2, .LC0@toc@ha |
74 | ld r0, .LC0@toc@l(r9) |
75 | cmpdi cr7, r0, 0 |
76 | beq+ cr7, 1f |
77 | #endif |
78 | bl JUMPTARGET (PREINIT_FUNCTION) |
79 | nop |
80 | 1: |
81 | |
82 | .section ".fini" , "ax" , @progbits |
83 | ENTRY_2(_fini) |
84 | .hidden _fini |
85 | .align ALIGNARG (2) |
86 | BODY_LABEL (_fini): |
87 | LOCALENTRY(_fini) |
88 | mflr 0 |
89 | std 0, FRAME_LR_SAVE(r1) |
90 | stdu r1, -FRAME_MIN_SIZE_PARM(r1) |
91 | |