1/*-
2 * SPDX-License-Identifier: BSD-1-Clause
3 *
4 * Copyright 2018 Andrew Turner
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 *
12 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
13 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
14 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
15 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
16 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
17 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
18 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
19 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
20 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
21 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
22 */
23
24#include <sys/param.h>
25
26#include "crt.h"
27
28typedef void (*crt_func)(void);
29
30extern void *__dso_handle __hidden;
31
32#ifndef SHARED
33void *__dso_handle = 0;
34#else
35void *__dso_handle = &__dso_handle;
36void __cxa_finalize(void *) __weak_symbol;
37
38/*
39 * Call __cxa_finalize with the dso handle in shared objects.
40 * When we have ctors/dtors call from the dtor handler before calling
41 * any dtors, otherwise use a destructor.
42 */
43#ifndef HAVE_CTORS
44__attribute__((destructor))
45#endif
46static void
47run_cxa_finalize(void)
48{
49
50	if (__cxa_finalize != NULL)
51		__cxa_finalize(__dso_handle);
52}
53#endif
54
55/*
56 * On some architectures and toolchains we may need to call the .dtors.
57 * These are called in the order they are in the ELF file.
58 */
59#ifdef HAVE_CTORS
60static void __do_global_dtors_aux(void) __used;
61
62static crt_func __CTOR_LIST__[] __section(".ctors") __used = {
63	(crt_func)-1
64};
65static crt_func __DTOR_LIST__[] __section(".dtors") __used = {
66	(crt_func)-1
67};
68
69static void
70__do_global_dtors_aux(void)
71{
72	crt_func fn;
73	int n;
74
75#ifdef SHARED
76	run_cxa_finalize();
77#endif
78
79	for (n = 1;; n++) {
80		fn = __DTOR_LIST__[n];
81		if (fn == (crt_func)0 || fn == (crt_func)-1)
82			break;
83		fn();
84	}
85}
86
87asm (
88    ".pushsection .fini		\n"
89    "\t" INIT_CALL_SEQ(__do_global_dtors_aux) "\n"
90    ".popsection		\n"
91);
92#endif
93
94/*
95 * Handler for gcj. These provide a _Jv_RegisterClasses function and fill
96 * out the .jcr section. We just need to call this function with a pointer
97 * to the appropriate section.
98 */
99extern void _Jv_RegisterClasses(void *) __weak_symbol;
100static void register_classes(void) __used;
101
102static crt_func __JCR_LIST__[] __section(".jcr") __used = { };
103
104#ifndef CTORS_CONSTRUCTORS
105__attribute__((constructor))
106#endif
107static void
108register_classes(void)
109{
110
111	if (_Jv_RegisterClasses != NULL && __JCR_LIST__[0] != 0)
112		_Jv_RegisterClasses(__JCR_LIST__);
113}
114
115/*
116 * We can't use constructors when they use the .ctors section as they may be
117 * placed before __CTOR_LIST__.
118 */
119#ifdef CTORS_CONSTRUCTORS
120asm (
121    ".pushsection .init		\n"
122    "\t" INIT_CALL_SEQ(register_classes) "\n"
123    ".popsection		\n"
124);
125#endif
126