xref: /freebsd-10.0-release/lib/csu/common/ignore_init.c

/*-
 * Copyright 2012 Konstantin Belousov <kib@FreeBSD.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include "notes.h"

extern int main(int, char **, char **);

extern void (*__preinit_array_start[])(int, char **, char **) __hidden;
extern void (*__preinit_array_end[])(int, char **, char **) __hidden;
extern void (*__init_array_start[])(int, char **, char **) __hidden;
extern void (*__init_array_end[])(int, char **, char **) __hidden;
extern void (*__fini_array_start[])(void) __hidden;
extern void (*__fini_array_end[])(void) __hidden;
extern void _fini(void) __hidden;
extern void _init(void) __hidden;

extern int _DYNAMIC;
#pragma weak _DYNAMIC

char **environ;
const char *__progname = "";

static void
finalizer(void)
{
	void (*fn)(void);
	size_t array_size, n;

	array_size = __fini_array_end - __fini_array_start;
	for (n = array_size; n > 0; n--) {
		fn = __fini_array_start[n - 1];
		if ((uintptr_t)fn != 0 && (uintptr_t)fn != 1)
			(fn)();
	}
	_fini();
}

static inline void
handle_static_init(int argc, char **argv, char **env)
{
	void (*fn)(int, char **, char **);
	size_t array_size, n;

	if (&_DYNAMIC != NULL)
		return;

	atexit(finalizer);

	array_size = __preinit_array_end - __preinit_array_start;
	for (n = 0; n < array_size; n++) {
		fn = __preinit_array_start[n];
		if ((uintptr_t)fn != 0 && (uintptr_t)fn != 1)
			fn(argc, argv, env);
	}
	_init();
	array_size = __init_array_end - __init_array_start;
	for (n = 0; n < array_size; n++) {
		fn = __init_array_start[n];
		if ((uintptr_t)fn != 0 && (uintptr_t)fn != 1)
			fn(argc, argv, env);
	}
}

static inline void
handle_argv(int argc, char *argv[], char **env)
{
	const char *s;

	if (environ == NULL)
		environ = env;
	if (argc > 0 && argv[0] != NULL) {
		__progname = argv[0];
		for (s = __progname; *s != '\0'; s++) {
			if (*s == '/')
				__progname = s + 1;
		}
	}
}

static const struct {
	int32_t	namesz;
	int32_t	descsz;
	int32_t	type;
	char	name[sizeof(NOTE_FREEBSD_VENDOR)];
	uint32_t desc;
} crt_noinit_tag __attribute__ ((section (NOTE_SECTION),
    aligned(4))) __used = {
	.namesz = sizeof(NOTE_FREEBSD_VENDOR),
	.descsz = sizeof(uint32_t),
	.type = CRT_NOINIT_NOTETYPE,
	.name = NOTE_FREEBSD_VENDOR,
	.desc = 0
};