lib/csu/i386/crt0.c

   1 /*      $NetBSD: crt0.c,v 1.34 2008/04/28 20:22:54 martin Exp $ */
   2
   3 /*-
   4  * Copyright (c) 1998 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Charles M. Hannum and Paul Kranenburg.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <stdlib.h>
  33
  34 #include "common.h"
  35
  36 extern  void            start __P((void)) __asm("start");
  37         void            __start __P((int, char *[], char *[]));
  38
  39 __asm("
  40         .text
  41         .align  2
  42         .globl  start
  43 start:
  44         movl    %ebx,___ps_strings
  45         movl    (%esp),%eax
  46         leal    8(%esp,%eax,4),%ecx
  47         leal    4(%esp),%edx
  48         pushl   %ecx
  49         pushl   %edx
  50         pushl   %eax
  51         call    ___start
  52 ");
  53
  54 #if defined(LIBC_SCCS) && !defined(lint)
  55 __RCSID("$NetBSD: crt0.c,v 1.34 2008/04/28 20:22:54 martin Exp $");
  56 #endif /* LIBC_SCCS and not lint */
  57
  58 void
  59 __start(argc, argv, envp)
  60         int argc;
  61         char *argv[];
  62         char *envp[];
  63 {
  64         char *ap;
  65
  66         environ = envp;
  67
  68         if ((ap = argv[0]))
  69                 if ((__progname = _strrchr(ap, '/')) == NULL)
  70                         __progname = ap;
  71                 else
  72                         ++__progname;
  73
  74 #ifdef DYNAMIC
  75         /* ld(1) convention: if DYNAMIC = 0 then statically linked */
  76         if (&_DYNAMIC)
  77                 __load_rtld(&_DYNAMIC);
  78 #endif /* DYNAMIC */
  79
  80 #ifdef MCRT0
  81         atexit(_mcleanup);
  82         monstartup((u_long)&eprol, (u_long)&etext);
  83 #endif /* MCRT0 */
  84
  85 __asm("__callmain:");           /* Defined for the benefit of debuggers */
  86         exit(main(argc, argv, envp));
  87 }
  88
  89 #ifdef DYNAMIC
  90 __asm("
  91         .text
  92         .align  2
  93 ___syscall:
  94         popl    %ecx
  95         popl    %eax
  96         pushl   %ecx
  97         int     $0x80
  98         jc      1f
  99         jmp     %ecx
 100 1:
 101         movl    $-1,%eax
 102         jmp     %ecx
 103 ");
 104 #endif /* DYNAMIC */
 105
 106 #include "common.c"
 107
 108 #ifdef MCRT0
 109 __asm("
 110         .text
 111         .align  2
 112 eprol:
 113 ");
 114 #endif /* MCRT0 */