external/bsd/pcc/dist/pcc-libs/csu/darwin/powerpc/crt0.c

   1 /*      $Id: crt0.c,v 1.1.1.2 2009/09/04 00:27:35 gmcgarry Exp $        */
   2 /*-
   3  * Copyright (c) 2008 Gregory McGarry <g.mcgarry@ieee.org>
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #include "common.h"
  19
  20 void _start(int, char **, char **);
  21
  22 char **environ;
  23 char *__progname = "";
  24 int NXArgc;
  25 char **NXArgv;
  26
  27 asm(
  28 #ifdef DYNAMIC
  29         "       .text\n"
  30         "       .symbol_stub\n"
  31         "       .picsymbol_stub\n"
  32 #endif
  33         "       .text\n"
  34         "       .globl start\n"
  35         "       .globl _start\n"
  36         "       .p2align 2\n"
  37         "start:\n"
  38         "_start:\n"
  39         "       mr r26,r1\n"
  40         "       subi r1,r1,4\n"
  41         "       clrrwi r1,r1,5\n"
  42         "       li r0,0\n"
  43         "       stw r0,0(r1)\n"
  44         "       stwu r1,-64(r1)\n"
  45         "       lwz r3,0(r26)\n"
  46         "       addi r4,r26,4\n"
  47         "       addi r27,r3,1\n"
  48         "       slwi r27,r27,2\n"
  49         "       add r5,r4,r27\n"
  50         "       bl __start\n"
  51         "       trap\n"
  52 );
  53
  54
  55 void
  56 _start(int argc, char *argv[], char *envp[])
  57 {
  58         char *namep;
  59
  60         environ = envp;
  61         NXArgc = argc;
  62         NXArgv = argv;
  63
  64         if ((namep = argv[0]) != NULL) {
  65                 if ((__progname = _strrchr(namep, '/')) == NULL)
  66                         __progname = namep;
  67                 else
  68                         __progname++;
  69         }
  70
  71         /*
  72          * Initialise hooks inside libc
  73          */
  74         if (mach_init_routine)
  75                 (*mach_init_routine)();
  76         if (_cthread_init_routine)
  77                 (*_cthread_init_routine)();
  78
  79 #ifdef PROFILE
  80         atexit(_mcleanup);
  81         moninit();
  82 #endif
  83
  84         atexit(_fini);
  85         _init();
  86
  87         exit(main(argc, argv, environ));
  88 }
  89
  90
  91 #ifdef DYNAMIC
  92
  93 /*
  94  *  dylib constructors/destructors
  95  */
  96 asm(
  97         "       .constructor\n"
  98         "       .p2align 2\n"
  99         "       .long __dyld_init\n"
 100         "       .destructor\n"
 101         "       .p2align 2\n"
 102         "       .long __dyld_fini\n"
 103 );
 104
 105 /*
 106  *  void _dyld_func_lookup(const char *, void **);
 107  *
 108  *  jump to the linker via the pointer in the __dyld section
 109  */
 110 asm(
 111         "       .text\n"
 112         "       .p2align 2\n"
 113         "       .private_extern __dyld_func_lookup\n"
 114         "__dyld_func_lookup:\n"
 115         "       lis r11,ha16(Ldyld_func_lookup)\n"
 116         "       lwz r11,lo16(Ldyld_func_lookup)(r11)\n"
 117         "       mtctr r11\n"
 118         "       bctr\n"
 119 );
 120
 121 /*
 122  *  void dyld_stub_binding_helper(void)
 123  */
 124 asm(
 125         "       .text\n"
 126         "       .p2align 2\n"
 127         "       .private_extern dyld_stub_binding_helper\n"
 128         "dyld_stub_binding_helper:\n"
 129         "       lis r12,ha16(Ldyld_lazy_binder)\n"
 130         "       lwz r12,lo16(Ldyld_lazy_binder)(r12)\n"
 131         "       mtctr r12\n"
 132         "       lis r12,ha16(__mh_execute_header)\n"
 133         "       addi r12,r12,lo16(__mh_execute_header)\n"
 134         "       bctr\n"
 135 );
 136
 137 /*
 138  * __dyld section
 139  */
 140 asm(
 141         "       .dyld\n"
 142         "       .p2align 2\n"
 143         "Ldyld_lazy_binder:\n"
 144         "       .long 0x8fe01000\n"
 145         "Ldyld_func_lookup:\n"
 146         "       .long 0x8fe01008\n"
 147         "       .long __mh_execute_header\n"
 148         "       .long _NXArgc\n"
 149         "       .long _NXArgv\n"
 150         "       .long _environ\n"
 151         "       .long ___progname\n"
 152 );
 153
 154 #endif
 155
 156 asm("\t.subsections_via_symbols\n");
 157
 158 #include "common.c"
 159
 160 IDENT("$Id: crt0.c,v 1.1.1.2 2009/09/04 00:27:35 gmcgarry Exp $");