sysdeps/standalone/m68k/m68020/mvme136/_exit.c

   1 /* Copyright (C) 1994, 1997, 1999 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Joel Sherrill (jsherril@redstone-emh2.army.mil),
   4      On-Line Applications Research Corporation.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <unistd.h>
  22 #include <stdlib.h>
  23 #include "m68020.h"
  24
  25 /* Return control to 135Bug */
  26
  27 void
  28 __exit_trap ()
  29 {
  30   set_vbr( 0 );                     /* restore 135Bug vectors */
  31   asm volatile( "trap   #15"  );    /* trap to 135Bug */
  32   asm volatile( ".short 0x63" );    /* return to 135Bug (.RETURN) */
  33   asm volatile( "jmp    main" );    /* restart program */
  34 }
  35
  36 /* The function `_exit' should take a status argument and simply
  37    terminate program execution, using the low-order 8 bits of the
  38    given integer as status.  */
  39
  40 void
  41 __attribute__ ((noreturn))
  42 _exit (status)
  43      int status;
  44 {
  45   /* status is ignored */
  46
  47   M68Kvec[ 45 ] = __exit_trap;   /* install exit_trap handler */
  48   asm volatile( "trap #13" );  /* insures SUPV mode */
  49 }
  50 weak_alias (_exit, _Exit)