lib/csu/amd64/crt1.c

   1 /* LINTLIBRARY */
   2 /*-
   3  * Copyright 1996-1998 John D. Polstra.
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/lib/csu/amd64/crt1.c,v 1.13 2003/04/30 19:27:07 peter Exp $
  27  * $DragonFly: src/lib/csu/amd64/crt1.c,v 1.2 2008/08/25 23:38:35 dillon Exp $
  28  */
  29
  30 #ifndef lint
  31 #ifndef __GNUC__
  32 #error "GCC is needed to compile this file"
  33 #endif
  34 #endif /* lint */
  35
  36 #include <stdlib.h>
  37
  38 #include "libc_private.h"
  39 #include "crtbrand.c"
  40
  41 extern int _DYNAMIC;
  42 #pragma weak _DYNAMIC
  43
  44 typedef void (*fptr)(void);
  45
  46 extern void _fini(void);
  47 extern void _init(void);
  48 extern int main(int, char **, char **);
  49 extern void _start(char **, void (*)(void));
  50
  51 #ifdef GCRT
  52 extern void _mcleanup(void);
  53 extern void monstartup(void *, void *);
  54 extern int eprol;
  55 extern int etext;
  56 #endif
  57
  58 char **environ;
  59 const char *__progname = "";
  60
  61 /* The entry function. */
  62 void
  63 _start(char **ap, void (*cleanup)(void))
  64 {
  65         int argc;
  66         char **argv;
  67         char **env;
  68         const char *s;
  69
  70         argc = *(long *)(void *)ap;
  71         argv = ap + 1;
  72         env = ap + 2 + argc;
  73         environ = env;
  74         if (argc > 0 && argv[0] != NULL) {
  75                 __progname = argv[0];
  76                 for (s = __progname; *s != '\0'; s++)
  77                         if (*s == '/')
  78                                 __progname = s + 1;
  79         }
  80
  81         /*
  82          * Setup the initial TLS space.  The RTLD does not set up our TLS
  83          * (it can't, it doesn't know how our errno is declared).  It simply
  84          * does all the groundwork required so that we can call
  85          * _rtld_allocate_tls().
  86          */
  87         _init_tls();
  88         _rtld_call_init();
  89
  90         if (&_DYNAMIC != NULL)
  91                 atexit(cleanup);
  92
  93 #ifdef GCRT
  94         atexit(_mcleanup);
  95 #endif
  96         atexit(_fini);
  97 #ifdef GCRT
  98         monstartup(&eprol, &etext);
  99 #endif
 100         _init();
 101         exit( main(argc, argv, env) );
 102 }
 103
 104 #ifdef GCRT
 105 __asm__(".text");
 106 __asm__("eprol:");
 107 __asm__(".previous");
 108 #endif
 109
 110 __asm__(".ident\t\"$DragonFly: src/lib/csu/amd64/crt1.c,v 1.2 2008/08/25 23:38:35 dillon Exp $\"");