lib/csu/powerpc/crt0.c

   1 /* $NetBSD: crt0.c,v 1.30 2011/03/12 07:56:36 matt Exp $ */
   2
   3 /*
   4  * Copyright (c) 1997 Jason R. Thorpe.
   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 /*
  41  * Small Data Area designators.  If not defined, will show up as being
  42  * at address zero.
  43  */
  44 __weakref_visible int rtld_SDA_BASE_[] __weak_reference(_SDA_BASE_);
  45 __weakref_visible int rtld_SDA2_BASE_[] __weak_reference(_SDA2_BASE_);
  46
  47 /*
  48  * First 5 arguments are specified by the PowerPC SVR4 ABI.  The
  49  * last argument, ps_strings, is a NetBSD extension.
  50  */
  51 void _start(int, char **, char **, const Obj_Entry *,
  52                 void (*)(void), struct ps_strings *);
  53
  54 void
  55 _start(int argc, char **argv, char **envp,
  56     const Obj_Entry *obj,                       /* from shared loader */
  57     void (*cleanup)(void),                      /* from shared loader */
  58     struct ps_strings *ps_strings)              /* NetBSD extension */
  59 {
  60         char *namep;
  61
  62         /*
  63          * Initialize the Small Data Area registers.
  64          * _SDA_BASE is defined in the SVR4 ABI for PPC.
  65          *
  66          * Do the initialization in a PIC manner.
  67          */
  68         __asm(
  69                 "bcl 20,31,1f;"
  70                 "1: mflr 11;"
  71                 "addis 13,11,rtld_SDA_BASE_-1b@ha;"
  72                 "addi 13,13,rtld_SDA_BASE_-1b@l;"
  73             ::: "lr" );
  74
  75         if ((namep = argv[0]) != NULL) {        /* NULL ptr if argc = 0 */
  76                 if ((__progname = _strrchr(namep, '/')) == NULL)
  77                         __progname = namep;
  78                 else
  79                         __progname++;
  80         }
  81
  82         environ = envp;
  83
  84         if (ps_strings != (struct ps_strings *)0)
  85                 __ps_strings = ps_strings;
  86
  87 #ifdef DYNAMIC
  88         if (&rtld_DYNAMIC != NULL)
  89                 _rtld_setup(cleanup, obj);
  90 #endif
  91
  92         _libc_init();
  93
  94 #ifdef MCRT0
  95         atexit(_mcleanup);
  96         monstartup((u_long)&_eprol, (u_long)&_etext);
  97 #endif
  98
  99         atexit(_fini);
 100         _init();
 101
 102         exit(main(argc, argv, environ));
 103 }
 104
 105 /*
 106  * NOTE: Leave the RCS ID _after_ __start(), in case it gets placed in .text.
 107  */
 108 #if defined(LIBC_SCCS) && !defined(lint)
 109 __RCSID("$NetBSD: crt0.c,v 1.30 2011/03/12 07:56:36 matt Exp $");
 110 #endif /* LIBC_SCCS and not lint */
 111
 112 #include "common.c"