lib/csu/sparc64/crt0.c

   1 /* $NetBSD: crt0.c,v 1.23 2004/08/26 21:21:33 thorpej Exp $ */
   2
   3 /*
   4  * Copyright (c) 1995 Christopher G. Demetriou
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *          This product includes software developed for the
  18  *          NetBSD Project.  See http://www.NetBSD.org/ for
  19  *          information about NetBSD.
  20  * 4. The name of the author may not be used to endorse or promote products
  21  *    derived from this software without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  *
  34  * <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
  35  */
  36
  37 #include "common.h"
  38
  39 /*
  40  * __start needs to gather up argc, argv, env_p, ps_strings, the termination
  41  * routine passed in %g1 and call ___start to finish up the startup processing.
  42  *
  43  * NB:  We are violating the ELF spec by passing a pointer to the ps strings in
  44  *      %g1 instead of a termination routine.
  45  */
  46
  47 __asm("\n\
  48         .data\n\
  49 __data_start:                                   ! Start of data section\n\
  50         .text\n\
  51         .align 4\n\
  52         .global _start\n\
  53         .global __start\n\
  54         .register %g3,#scratch\n\
  55         .register %g2,#scratch\n\
  56 _start:\n\
  57 __start:\n\
  58         setx    __data_start, %o0, %g4          ! Point %g4 to start of data section\n\
  59         clr     %g4                             ! egcs thinks this is zero. XXX\n\
  60         clr     %fp\n\
  61         add     %sp, 8*16 + 0x7ff, %o0          ! start of stack\n\
  62         mov     %g1, %o1                        ! Cleanup routine\n\
  63         mov     %g3, %o1                        ! XXXX our rtld uses %g3\n\
  64         mov     %g2, %o2                        ! XXXX obj from rtld.\n\
  65         ba,pt   %icc, ___start                  ! XXXX jump over the retl egcs 2.96 inserts\n\
  66         mov     %g1, %o3                        ! ps_strings XXXX\n\
  67 ");
  68
  69 void ___start(char **, void (*cleanup)(void), const Obj_Entry *,
  70                 struct ps_strings *);
  71
  72 void
  73 ___start(char **sp,
  74     void (*cleanup)(void),                      /* from shared loader */
  75     const Obj_Entry *obj,                       /* from shared loader */
  76     struct ps_strings *ps_strings)
  77 {
  78         long argc;
  79         char **argv, *namep;
  80
  81         argc = *(long *)sp;
  82         argv = sp + 1;
  83         environ = sp + 2 + argc;                /* 2: argc + NULL ending argv */
  84
  85         if ((namep = argv[0]) != NULL) {        /* NULL ptr if argc = 0 */
  86                 if ((__progname = _strrchr(namep, '/')) == NULL)
  87                         __progname = namep;
  88                 else
  89                         __progname++;
  90         }
  91
  92         if (ps_strings != (struct ps_strings *)0 &&
  93             ps_strings != (struct ps_strings *)0xbabefacedeadbeef)
  94                 __ps_strings = ps_strings;
  95
  96 #ifdef DYNAMIC
  97         if (&_DYNAMIC != NULL)
  98                 _rtld_setup(cleanup, obj);
  99 #endif
 100
 101 #ifdef MCRT0
 102         atexit(_mcleanup);
 103         monstartup((u_long)&_eprol, (u_long)&_etext);
 104 #endif
 105
 106         atexit(_fini);
 107         _init();
 108
 109         exit(main(argc, argv, environ));
 110 }
 111
 112 /*
 113  * NOTE: Leave the RCS ID _after_ _start(), in case it gets placed in .text.
 114  */
 115 #if defined(LIBC_SCCS) && !defined(lint)
 116 __RCSID("$NetBSD: crt0.c,v 1.23 2004/08/26 21:21:33 thorpej Exp $");
 117 #endif /* LIBC_SCCS and not lint */
 118
 119 #include "common.c"