1/*-
2 * SPDX-License-Identifier: BSD-1-Clause
3 *
4 * Copyright 2012 Konstantin Belousov <kib@FreeBSD.org>
5 * Copyright (c) 2018 The FreeBSD Foundation
6 *
7 * Parts of this software was developed by Konstantin Belousov
8 * <kib@FreeBSD.org> under sponsorship from the FreeBSD Foundation.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD$");
30
31#include <sys/param.h>
32#include <sys/elf.h>
33#include <sys/elf_common.h>
34
35extern int main(int, char **, char **);
36
37extern void (*__preinit_array_start[])(int, char **, char **) __hidden;
38extern void (*__preinit_array_end[])(int, char **, char **) __hidden;
39extern void (*__init_array_start[])(int, char **, char **) __hidden;
40extern void (*__init_array_end[])(int, char **, char **) __hidden;
41extern void (*__fini_array_start[])(void) __hidden;
42extern void (*__fini_array_end[])(void) __hidden;
43extern void _fini(void) __hidden;
44extern void _init(void) __hidden;
45
46extern int _DYNAMIC;
47#pragma weak _DYNAMIC
48
49#if defined(CRT_IRELOC_RELA)
50extern const Elf_Rela __rela_iplt_start[] __weak_symbol __hidden;
51extern const Elf_Rela __rela_iplt_end[] __weak_symbol __hidden;
52
53#include "reloc.c"
54
55static void
56process_irelocs(void)
57{
58	const Elf_Rela *r;
59
60	for (r = &__rela_iplt_start[0]; r < &__rela_iplt_end[0]; r++)
61		crt1_handle_rela(r);
62}
63#elif defined(CRT_IRELOC_REL)
64extern const Elf_Rel __rel_iplt_start[] __weak_symbol __hidden;
65extern const Elf_Rel __rel_iplt_end[] __weak_symbol __hidden;
66
67#include "reloc.c"
68
69static void
70process_irelocs(void)
71{
72	const Elf_Rel *r;
73
74	for (r = &__rel_iplt_start[0]; r < &__rel_iplt_end[0]; r++)
75		crt1_handle_rel(r);
76}
77#elif defined(CRT_IRELOC_SUPPRESS)
78#else
79#error "Define platform reloc type"
80#endif
81
82char **environ;
83const char *__progname = "";
84
85static void
86finalizer(void)
87{
88	void (*fn)(void);
89	size_t array_size, n;
90
91	array_size = __fini_array_end - __fini_array_start;
92	for (n = array_size; n > 0; n--) {
93		fn = __fini_array_start[n - 1];
94		if ((uintptr_t)fn != 0 && (uintptr_t)fn != 1)
95			(fn)();
96	}
97	_fini();
98}
99
100static inline void
101handle_static_init(int argc, char **argv, char **env)
102{
103	void (*fn)(int, char **, char **);
104	size_t array_size, n;
105
106	if (&_DYNAMIC != NULL)
107		return;
108
109	atexit(finalizer);
110
111	array_size = __preinit_array_end - __preinit_array_start;
112	for (n = 0; n < array_size; n++) {
113		fn = __preinit_array_start[n];
114		if ((uintptr_t)fn != 0 && (uintptr_t)fn != 1)
115			fn(argc, argv, env);
116	}
117	_init();
118	array_size = __init_array_end - __init_array_start;
119	for (n = 0; n < array_size; n++) {
120		fn = __init_array_start[n];
121		if ((uintptr_t)fn != 0 && (uintptr_t)fn != 1)
122			fn(argc, argv, env);
123	}
124}
125
126static inline void
127handle_argv(int argc, char *argv[], char **env)
128{
129	const char *s;
130
131	if (environ == NULL)
132		environ = env;
133	if (argc > 0 && argv[0] != NULL) {
134		__progname = argv[0];
135		for (s = __progname; *s != '\0'; s++) {
136			if (*s == '/')
137				__progname = s + 1;
138		}
139	}
140}
141