1/*	$OpenBSD: crt0.c,v 1.18 2023/07/27 18:17:14 kettenis Exp $	*/
2
3/*
4 * Copyright (c) 1995 Christopher G. Demetriou
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *      This product includes software developed by Christopher G. Demetriou
18 *	for the NetBSD Project.
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#include <sys/syscall.h>
35#include <stdlib.h>
36#include <limits.h>
37
38#include "md_init.h"
39#ifdef RCRT0
40# include BOOT_H
41#endif
42#include "extern.h"
43
44#define STR(x) __STRING(x)	/* shorter macro name for MD_RCRT0_START */
45
46/* some defaults */
47#ifndef	MD_START_ARGS
48#define	MD_START_ARGS	\
49	int argc, char **argv, char **envp, void (*cleanup)(void)
50#endif
51static void		___start(MD_START_ARGS) __used;
52#ifndef	MD_EPROL_LABEL
53#define	MD_EPROL_LABEL	__asm("  .text\n_eprol:")
54#endif
55#ifndef RCRT0_RELRO
56#define RCRT0_RELRO()	do {} while (0)
57#endif
58
59char	***_csu_finish(char **_argv, char **_envp, void (*_cleanup)(void));
60
61#ifdef MCRT0
62#include <sys/gmon.h>
63extern __dso_hidden unsigned char _etext, _eprol;
64#endif /* MCRT0 */
65
66#ifdef RCRT0
67#ifdef MD_RCRT0_START
68MD_RCRT0_START;
69#endif
70#else
71#ifdef MD_CRT0_START
72MD_CRT0_START;
73#endif
74#endif
75
76extern __dso_hidden initarray_f __preinit_array_start[],
77	__preinit_array_end[], __init_array_start[], __init_array_end[];
78
79extern char __csu_do_fini_array __dso_hidden;
80
81static void
82___start(MD_START_ARGS)
83{
84	size_t size, i;
85	char ***environp;
86#ifdef MD_START_SETUP
87	MD_START_SETUP
88#endif
89
90	environp = _csu_finish(argv, envp, cleanup);
91
92#ifndef RCRT0
93	if (cleanup == NULL) {
94#endif
95		size = __preinit_array_end - __preinit_array_start;
96		for (i = 0; i < size; i++)
97			__preinit_array_start[i](argc, argv, envp, NULL);
98		RCRT0_RELRO();
99		size = __init_array_end - __init_array_start;
100		for (i = 0; i < size; i++)
101			__init_array_start[i](argc, argv, envp, NULL);
102		__csu_do_fini_array = 1;
103#ifndef RCRT0
104	}
105#endif
106
107#ifdef MCRT0
108	atexit(_mcleanup);
109	_monstartup((u_long)&_eprol, (u_long)&_etext);
110#endif
111
112	__init();
113
114	exit(main(argc, argv, *environp));
115}
116
117#ifdef MCRT0
118MD_EPROL_LABEL;
119#endif
120