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00268a80 | 1 | /* Special .init and .fini section support for Alpha. |
688903eb | 2 | Copyright (C) 2001-2018 Free Software Foundation, Inc. |
00268a80 UD |
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 | ||
0bec0145 RM |
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 | ||
00268a80 UD |
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/>. */ | |
00268a80 | 35 | |
9fb2a6b9 RH |
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. | |
00268a80 | 40 | |
9fb2a6b9 | 41 | This differs from what would be generated for ordinary code in that |
00268a80 UD |
42 | we save and restore the GP within the function. In order for linker |
43 | relaxation to work, the value in the GP register on exit from a function | |
44 | must be valid for the function entry point. Normally, a function is | |
45 | contained within one object file and this is not an issue, provided | |
46 | that the function reloads the gp after making any function calls. | |
47 | However, _init and _fini are constructed from pieces of many object | |
48 | files, all of which may have different GP values. So we must reload | |
49 | the GP value from crti.o in crtn.o. */ | |
50 | ||
9fb2a6b9 RH |
51 | #include <libc-symbols.h> |
52 | #include <sysdep.h> | |
53 | ||
54 | #ifndef PREINIT_FUNCTION | |
55 | # define PREINIT_FUNCTION __gmon_start__ | |
56 | #endif | |
57 | ||
58 | #ifndef PREINIT_FUNCTION_WEAK | |
59 | # define PREINIT_FUNCTION_WEAK 1 | |
60 | #endif | |
61 | ||
62 | #if PREINIT_FUNCTION_WEAK | |
63 | weak_extern (PREINIT_FUNCTION) | |
64 | #else | |
65 | .hidden PREINIT_FUNCTION | |
66 | #endif | |
67 | ||
68 | .section .init, "ax", @progbits | |
69 | .globl _init | |
70 | .type _init, @function | |
71 | .usepv _init, std | |
72 | _init: | |
73 | ldgp $29, 0($27) | |
74 | subq $30, 16, $30 | |
75 | #if PREINIT_FUNCTION_WEAK | |
76 | lda $27, PREINIT_FUNCTION | |
77 | #endif | |
78 | stq $26, 0($30) | |
79 | stq $29, 8($30) | |
80 | #if PREINIT_FUNCTION_WEAK | |
81 | beq $27, 1f | |
82 | jsr $26, ($27), PREINIT_FUNCTION | |
83 | ldq $29, 8($30) | |
84 | 1: | |
85 | #else | |
86 | bsr $26, PREINIT_FUNCTION !samegp | |
87 | #endif | |
88 | .p2align 3 | |
89 | ||
90 | .section .fini, "ax", @progbits | |
91 | .globl _fini | |
92 | .type _fini,@function | |
93 | .usepv _fini,std | |
94 | _fini: | |
95 | ldgp $29, 0($27) | |
96 | subq $30, 16, $30 | |
97 | stq $26, 0($30) | |
98 | stq $29, 8($30) | |
99 | .p2align 3 |