/*      $OpenBSD: crt0.c,v 1.19 2025/05/24 06:32:12 deraadt Exp $       */

/*
 * Copyright (c) 1995 Christopher G. Demetriou
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Christopher G. Demetriou
 *      for the NetBSD Project.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission
 *
 * 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/syscall.h>
#include <stdlib.h>
#include <limits.h>

#include "md_init.h"
#ifdef RCRT0
# include BOOT_H
#endif
#include "extern.h"

#define STR(x) __STRING(x)      /* shorter macro name for MD_RCRT0_START */

/* some defaults */
#ifndef MD_START_ARGS
#define MD_START_ARGS   \
        int argc, char **argv, char **envp, void (*cleanup)(void)
#endif
static void             ___start(MD_START_ARGS) __used;
#ifndef MD_EPROL_LABEL
#define MD_EPROL_LABEL  __asm("  .text\n_eprol:")
#endif
#ifndef RCRT0_RELRO
#define RCRT0_RELRO()   do {} while (0)
#endif

char    ***_csu_finish(char **_argv, char **_envp, void (*_cleanup)(void));

#ifdef MCRT0
#include <sys/gmon.h>
extern __dso_hidden unsigned char _etext, _eprol;
#endif /* MCRT0 */

#ifdef RCRT0
#ifdef MD_RCRT0_START
MD_RCRT0_START;
#endif
#else
#ifdef MD_CRT0_START
MD_CRT0_START;
#endif
#endif

extern __dso_hidden initarray_f __preinit_array_start[],
        __preinit_array_end[], __init_array_start[], __init_array_end[];

extern char __csu_do_fini_array __dso_hidden;

static void
___start(MD_START_ARGS)
{
        size_t size, i;
        char ***environp;
#ifdef MD_START_SETUP
        MD_START_SETUP
#endif

        environp = _csu_finish(argv, envp, cleanup);

#ifndef RCRT0
        if (cleanup == NULL) {
#endif
                size = __preinit_array_end - __preinit_array_start;
                for (i = 0; i < size; i++)
                        __preinit_array_start[i](argc, argv, envp, NULL);
                RCRT0_RELRO();
                size = __init_array_end - __init_array_start;
                for (i = 0; i < size; i++)
                        __init_array_start[i](argc, argv, envp, NULL);
                __csu_do_fini_array = 1;
#ifndef RCRT0
        }
#endif

#ifdef MCRT0
        atexit(_mcleanup);
        _monstartup((u_long)&_eprol, (u_long)&_etext);
#endif

        __init();

        exit(main(argc, argv, *environp));
}

#ifdef MCRT0
MD_EPROL_LABEL;
#endif

#ifdef MCRT0
/*
 * Contents:
 *
 *  long Name length
 *  long Description length
 *  long NT_OPENBSD_PROF (indicates binary is linked -pg)
 *  "OpenBSD\0"
 */

__asm(" .section \".note.openbsd.ident\", \"a\"\n"
"       .p2align 2\n"
"       .long   8\n"
"       .long   0\n"
"       .long   2\n"
"       .ascii \"OpenBSD\\0\"\n"
"       .previous\n");
#endif