1 /* $OpenBSD: crtbegin.c,v 1.26 2019/01/09 16:42:38 visa Exp $ */
2 /* $NetBSD: crtbegin.c,v 1.1 1996/09/12 16:59:03 cgd Exp $ */
3
4 /*
5 * Copyright (c) 1993 Paul Kranenburg
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by Paul Kranenburg.
19 * 4. The name of the author may not be used to endorse or promote products
20 * derived from this software without specific prior written permission
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 /*
35 * Run-time module for GNU C++ compiled shared libraries.
36 *
37 * The linker constructs the following arrays of pointers to global
38 * constructors and destructors. The first element contains the
39 * number of pointers in each.
40 * The tables are also null-terminated.
41 */
42 #include <stdlib.h>
43
44 #include "md_init.h"
45 #include "os-note-elf.h"
46 #include "extern.h"
47
48 struct dwarf2_eh_object {
49 void *space[8];
50 };
51
52 void __register_frame_info(const void *, struct dwarf2_eh_object *)
53 __attribute__((weak));
54
__register_frame_info(const void * begin,struct dwarf2_eh_object * ob)55 void __register_frame_info(const void *begin, struct dwarf2_eh_object *ob)
56 {
57 }
58
59 MD_DATA_SECTION_FLAGS_SYMBOL(".eh_frame", "a", const void *, __EH_FRAME_BEGIN__);
60
61 /*
62 * java class registration hooks
63 */
64
65 MD_DATA_SECTION_FLAGS_SYMBOL(".jcr", "aw", void *, __JCR_LIST__);
66
67 extern void _Jv_RegisterClasses (void *)
68 __attribute__((weak));
69
70
71 /*
72 * Include support for the __cxa_atexit/__cxa_finalize C++ abi for
73 * gcc > 2.x. __dso_handle is NULL in the main program and a unique
74 * value for each C++ shared library. For more info on this API, see:
75 *
76 * http://www.codesourcery.com/cxx-abi/abi.html#dso-dtor
77 */
78
79 void *__dso_handle = NULL;
80 __asm(".hidden __dso_handle");
81
82 long __guard_local __dso_hidden __attribute__((section(".openbsd.randomdata")));
83
84 MD_DATA_SECTION_SYMBOL_VALUE(".ctors", init_f, __CTOR_LIST__, -1);
85 MD_DATA_SECTION_SYMBOL_VALUE(".dtors", init_f, __DTOR_LIST__, -1);
86
87
88 static void
__ctors(void)89 __ctors(void)
90 {
91 unsigned long i = (unsigned long) __CTOR_LIST__[0];
92 const init_f *p;
93
94 if (i == -1) {
95 for (i = 1; __CTOR_LIST__[i] != NULL; i++)
96 ;
97 i--;
98 }
99 p = __CTOR_LIST__ + i;
100 while (i--)
101 (**p--)();
102 }
103
104 static void
__dtors(void)105 __dtors(void)
106 {
107 const init_f *p = __DTOR_LIST__ + 1;
108
109 while (*p)
110 (**p++)();
111 }
112
113 void __init(void);
114 void __fini(void);
115 static void __do_init(void) __used;
116 static void __do_fini(void) __used;
117
118 MD_SECTION_PROLOGUE(".init", __init);
119
120 MD_SECTION_PROLOGUE(".fini", __fini);
121
122 MD_SECT_CALL_FUNC(".init", __do_init);
123 MD_SECT_CALL_FUNC(".fini", __do_fini);
124
125
126 static void
__do_init(void)127 __do_init(void)
128 {
129 static int initialized;
130 static struct dwarf2_eh_object object;
131
132 /*
133 * Call global constructors.
134 * Arrange to call global destructors at exit.
135 */
136 if (!initialized) {
137 initialized = 1;
138
139 __register_frame_info(__EH_FRAME_BEGIN__, &object);
140 if (__JCR_LIST__[0] && _Jv_RegisterClasses)
141 _Jv_RegisterClasses(__JCR_LIST__);
142 __ctors();
143
144 atexit(__fini);
145 }
146 }
147
148 char __csu_do_fini_array __dso_hidden = 0;
149 extern __dso_hidden init_f __fini_array_start[], __fini_array_end[];
150
151 static void
__do_fini(void)152 __do_fini(void)
153 {
154 static int finalized;
155
156 if (!finalized) {
157 finalized = 1;
158 /*
159 * Call global destructors.
160 */
161 __dtors();
162
163 if (__csu_do_fini_array) {
164 size_t i = __fini_array_end - __fini_array_start;
165 while (i-- > 0)
166 __fini_array_start[i]();
167 }
168
169 }
170 }
171
172