compiler/startup/startup.c

   1
   2 /*
   3     Copyright © 1995-2009, The AROS Development Team. All rights reserved.
   4     $Id$
   5
   6     Desc: Common startup code
   7     Lang: english
   8 */
   9 #define DEBUG 0
  10
  11 #include <aros/config.h>
  12 #include <dos/dos.h>
  13 #include <exec/memory.h>
  14 #include <workbench/startup.h>
  15 #include <proto/exec.h>
  16 #include <proto/dos.h>
  17 #include <aros/asmcall.h>
  18 #include <aros/debug.h>
  19 #include <aros/symbolsets.h>
  20 #include <aros/startup.h>
  21
  22 struct DosLibrary *DOSBase;
  23 extern const LONG const __aros_libreq_DOSBase __attribute__((weak));
  24
  25 THIS_PROGRAM_HANDLES_SYMBOLSET(PROGRAM_ENTRIES)
  26
  27 extern int main(int argc, char ** argv);
  28 int (*__main_function_ptr)(int argc, char ** argv) __attribute__((__weak__)) = main;
  29
  30 /* if the programmer hasn't defined a symbol with the name __nocommandline
  31    then the code to handle the commandline will be included from the autoinit.lib
  32 */
  33 extern int __nocommandline;
  34 asm(".set __importcommandline, __nocommandline");
  35
  36 /* if the programmer hasn't defined a symbol with the name __nostdiowin
  37    then the code to open a window for stdio will be included from the autoinit.lib
  38 */
  39 extern int __nostdiowin;
  40 asm(".set __importstdiowin, __nostdiowin");
  41
  42 /* if the programmer hasn't defined a symbol with the name __nowbsupport
  43    then the code to handle support for programs started from WB will be included from
  44    the autoinit.lib
  45 */
  46 extern int __nowbsupport;
  47 asm(".set __importnowbsupport, __nowbsupport");
  48
  49 /* if the programmer hasn't defined a symbol with the name __noinitexitsets
  50    then the code to handle support for calling the INIT, EXIT symbolset functions
  51    and the autoopening of libraries is called from the autoinit.lib
  52 */
  53 extern int __noinitexitsets;
  54 asm(".set __importnoinitexitsets, __noinitexitsets");
  55
  56 extern void __startup_entries_init(void);
  57
  58 /* Guarantee that __startup_entry is placed at the beginning of the binary */
  59 __startup AROS_PROCH(__startup_entry, argstr, argsize, SysBase)
  60 {
  61     AROS_PROCFUNC_INIT
  62
  63     D(bug("Entering __startup_entry(\"%s\", %d, %x)\n", argstr, argsize, SysBase));
  64
  65     /*
  66         No one program will be able to do anything useful without the dos.library,
  67         so we open it here instead of using the automatic opening system
  68     */
  69     DOSBase = (struct DosLibrary *)OpenLibrary(DOSNAME, 0);
  70     if (!DOSBase) return RETURN_FAIL;
  71     if (((struct Library *)DOSBase)->lib_Version < __aros_libreq_DOSBase)
  72         return RETURN_FAIL;
  73
  74     __argstr  = argstr;
  75     __argsize = argsize;
  76     __startup_error = RETURN_FAIL;
  77
  78     __startup_entries_init();
  79     __startup_entries_next();
  80
  81     CloseLibrary((struct Library *)DOSBase);
  82
  83     D(bug("Leaving __startup_entry\n"));
  84
  85     return __startup_error;
  86
  87     AROS_PROCFUNC_EXIT
  88 } /* entry */
  89
  90
  91 static void __startup_main(struct ExecBase *SysBase)
  92 {
  93     D(bug("Entering __startup_main\n"));
  94
  95     /* Invoke the main function. A weak symbol is used as function name so that
  96        it can be overridden (for *nix stuff, for instance).  */
  97     __startup_error = (*__main_function_ptr) (__argc, __argv);
  98
  99     D(bug("Leaving __startup_main\n"));
 100 }
 101
 102 ADD2SET(__startup_main, PROGRAM_ENTRIES, 127);
 103
 104
 105 /*
 106     Stub function for GCC __main().
 107
 108     The __main() function is originally used for C++ style constructors
 109     and destructors in C. This replacement does nothing and gets rid of
 110     linker-errors about references to __main().
 111 */
 112 #ifdef AROS_NEEDS___MAIN
 113 void __main(void)
 114 {
 115     /* Do nothing. */
 116 }
 117 #endif