rtld: Add support for preinit, init, and fini arrays

[dragonfly.git] / lib / csu / i386 / crt1_c.c

/*-
 * Copyright 1996-1998 John D. Polstra.
 * 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.
 *
 * $FreeBSD: src/lib/csu/i386-elf/crt1.c, svn 200038 2009/12/02 kib $
 */

#ifndef __GNUC__
#error "GCC is needed to compile this file"
#endif

#include <machine/tls.h>
#include <stddef.h>
#include <stdlib.h>

#include "libc_private.h"
#include "crtbrand.c"

extern int _DYNAMIC;
#pragma weak _DYNAMIC

typedef void (*fptr)(void);

extern void _fini(void);
extern void _init(void);
extern int main(int, char **, char **);

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

#ifdef GCRT
extern void _mcleanup(void);
extern void monstartup(void *, void *);
extern int eprol;
extern int etext;
#endif

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

void _start1(fptr, int, char *[]) __dead2;

/* The entry function, C part. */
void
_start1(fptr cleanup, int argc, char *argv[])
{
    char **env;
    const char *s;
    size_t n, array_size;

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

    /*
     * Setup the initial TLS space.  The RTLD does not set up our TLS
     * (it can't, it doesn't know how our errno is declared).  It simply
     * does all the groundwork required so that we can call
     * _rtld_allocate_tls().
     */
    _init_tls();
    _rtld_call_init();

    if(&_DYNAMIC != NULL)
	atexit(cleanup);

#ifdef GCRT
    atexit(_mcleanup);
#endif
    /*
     * The fini_array needs to be executed in the opposite order of its
     * definition.  However, atexit works like a LIFO stack, so by
     * pushing functions in array order, they will be executed in the
     * reverse order as required.
     */
    atexit(_fini);
    array_size = __fini_array_end - __fini_array_start;
    for (n = 0; n < array_size; n++)
	atexit(*__fini_array_start [n]);
#ifdef GCRT
    monstartup(&eprol, &etext);
__asm__("eprol:");
#endif
    if (&_DYNAMIC == NULL) {
	/*
	 * For static executables preinit happens right before init.
	 * Dynamic executable preinit arrays are handled by rtld
	 * before any DSOs are initialized.
	 */
	array_size = __preinit_array_end - __preinit_array_start;
	for (n = 0; n < array_size; n++)
		(*__preinit_array_start [n])(argc, argv, env);
    }
    _init();
    array_size = __init_array_end - __init_array_start;
    for (n = 0; n < array_size; n++)
	(*__init_array_start [n])(argc, argv, env);
    exit( main(argc, argv, env) );
}

__asm(".hidden  _start1");