lib/csu/i386_elf/crt0.c

   1 /* $NetBSD: crt0.c,v 1.16 2006/05/17 17:08:54 christos Exp $ */
   2
   3 /*
   4  * Copyright (c) 1998 Christos Zoulas
   5  * Copyright (c) 1995 Christopher G. Demetriou
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *          This product includes software developed for the
  19  *          NetBSD Project.  See http://www.NetBSD.org/ for
  20  *          information about NetBSD.
  21  * 4. The name of the author may not be used to endorse or promote products
  22  *    derived from this software without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  25  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  26  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  27  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  28  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  29  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  30  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  31  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  32  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  33  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  *
  35  * <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
  36  */
  37
  38 #include "common.h"
  39
  40 void ___start __P((int, char **, char **, void (*cleanup) __P((void)),
  41     const Obj_Entry *, struct ps_strings *));
  42
  43 __asm(" .text                           \n"
  44 "       .align  4                       \n"
  45 "       .globl  __start                 \n"
  46 "       .globl  _start                  \n"
  47 "_start:                                \n"
  48 "__start:                               \n"
  49 "       pushl   %ebx                    # ps_strings    \n"
  50 "       pushl   %ecx                    # obj           \n"
  51 "       pushl   %edx                    # cleanup       \n"
  52 "       movl    12(%esp),%eax           \n"
  53 "       leal    20(%esp,%eax,4),%ecx    \n"
  54 "       leal    16(%esp),%edx           \n"
  55 "       pushl   %ecx                    \n"
  56 "       pushl   %edx                    \n"
  57 "       pushl   %eax                    \n"
  58 "       call    ___start");
  59
  60 void
  61 ___start(argc, argv, envp, cleanup, obj, ps_strings)
  62         int argc;
  63         char **argv;
  64         char **envp;
  65         void (*cleanup) __P((void));            /* from shared loader */
  66         const Obj_Entry *obj;                   /* from shared loader */
  67         struct ps_strings *ps_strings;
  68 {
  69         environ = envp;
  70
  71         if ((__progname = argv[0]) != NULL) {   /* NULL ptr if argc = 0 */
  72                 if ((__progname = _strrchr(__progname, '/')) == NULL)
  73                         __progname = argv[0];
  74                 else
  75                         __progname++;
  76         }
  77
  78         if (ps_strings != (struct ps_strings *)0)
  79                 __ps_strings = ps_strings;
  80
  81 #ifdef DYNAMIC
  82         if (&_DYNAMIC != NULL) {
  83                 _rtld_setup(cleanup, obj);
  84         }
  85 #endif
  86
  87 #ifdef MCRT0
  88         atexit(_mcleanup);
  89         monstartup((u_long)&_eprol, (u_long)&_etext);
  90 #endif
  91
  92         atexit(_fini);
  93         _init();
  94
  95         exit(main(argc, argv, environ));
  96 }
  97
  98 /*
  99  * NOTE: Leave the RCS ID _after_ __start(), in case it gets placed in .text.
 100  */
 101 #if defined(LIBC_SCCS) && !defined(lint)
 102 __RCSID("$NetBSD: crt0.c,v 1.16 2006/05/17 17:08:54 christos Exp $");
 103 #endif /* LIBC_SCCS and not lint */
 104
 105 #include "common.c"