gcc/config/m68k/aux-crt1.c

   1 /* Startup code for A/UX
   2    Copyright (C) 1996 Free Software Foundation, Inc.
   3
   4 This file is free software; you can redistribute it and/or modify it
   5 under the terms of the GNU General Public License as published by the
   6 Free Software Foundation; either version 2, or (at your option) any
   7 later version.
   8
   9 In addition to the permissions in the GNU General Public License, the
  10 Free Software Foundation gives you unlimited permission to link the
  11 compiled version of this file with other programs, and to distribute
  12 those programs without any restriction coming from the use of this
  13 file.  (The General Public License restrictions do apply in other
  14 respects; for example, they cover modification of the file, and
  15 distribution when not linked into another program.)
  16
  17 This file is distributed in the hope that it will be useful, but
  18 WITHOUT ANY WARRANTY; without even the implied warranty of
  19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20 General Public License for more details.
  21
  22 You should have received a copy of the GNU General Public License
  23 along with this program; see the file COPYING.  If not, write to
  24 the Free Software Foundation, 59 Temple Place - Suite 330,
  25 Boston, MA 02111-1307, USA.  */
  26
  27 /* As a special exception, if you link this library with files
  28    compiled with GCC to produce an executable, this does not cause
  29    the resulting executable to be covered by the GNU General Public License.
  30    This exception does not however invalidate any other reasons why
  31    the executable file might be covered by the GNU General Public License.  */
  32
  33 /* This file is compiled three times to produce crt1.o, mcrt1.o, and
  34    maccrt1.o.  The final two are created by defining MCRT1 and MACCRT1
  35    respectively.  */
  36
  37 #include <stdlib.h>
  38 #ifdef MCRT1
  39 #include <unistd.h>
  40 #include <mon.h>
  41 #endif
  42
  43 /* Extern function declarations */
  44
  45 extern void initfpu(void);
  46 extern void __istart(void);
  47 extern void __compatmode(void);
  48 extern void _cleanup(void);
  49 extern int main(int, char **, char **);
  50 extern void exit(int) __attribute__((noreturn));
  51 extern void _exit(int) __attribute__((noreturn));
  52
  53 #ifdef MACCRT1
  54 extern void InitMac(void);
  55 #endif
  56 #ifdef MCRT1
  57 static void monitor_start(void);
  58 #endif
  59
  60 /* Global variables */
  61
  62 char **environ;
  63 char *__splimit;                        /* address of top of stack */
  64
  65
  66 /* Initialize system and run */
  67
  68 void _start() __attribute__((noreturn));
  69 void _start()
  70 {
  71   register int *fp __asm__("%a6");
  72   register char *d0 __asm__("%d0");
  73   char **argv;
  74   int argc;
  75
  76   __splimit = d0;
  77   argc = fp[1];
  78   argv = (char **)&fp[2];
  79   environ = &argv[argc+1];
  80
  81   initfpu();
  82   __istart();
  83   __compatmode();
  84
  85   atexit(_cleanup);
  86 #ifdef MCRT1
  87   monitor_start();
  88 #endif
  89 #ifdef MACCRT1
  90   InitMac();
  91 #endif
  92
  93   exit(main(argc, argv, environ));
  94 }
  95
  96
  97 #ifdef MCRT1
  98 /* Start/Stop program monitor */
  99
 100 extern void monitor(void *, void *, WORD *, int, int);
 101
 102 static WORD *monitor_buffer;
 103
 104 static void monitor_cleanup(void)
 105 {
 106   monitor(NULL, NULL, NULL, 0, 0);
 107   free(monitor_buffer);
 108 }
 109
 110 static void monitor_start(void)
 111 {
 112   extern int etext;
 113   extern int stext __asm__(".text");
 114
 115   /* Choice of buffer size should be "no more than a few times
 116      smaller than the program size" -- I don't believe that there
 117      are any (useful) functions smaller than two insns (4 bytes)
 118      so that is the scale factor used here */
 119   int len = (&etext - &stext + 1) / 4;
 120
 121   monitor_buffer = (WORD *)calloc(len, sizeof(WORD));
 122   if (monitor_buffer == NULL)
 123     {
 124       static const char msg[] = "mcrt1: could not allocate monitor buffer\n";
 125       write(2, msg, sizeof(msg)-1);
 126       _exit(-1);
 127     }
 128
 129   /* I'm not sure why the count cap at 600 -- but that is what A/UX does */
 130   monitor(&stext, &etext, monitor_buffer, len, 600);
 131
 132   atexit(monitor_cleanup);
 133 }
 134 #endif /* MCRT1 */