newlib/libc/machine/nvptx/_exit.c

   1 /*
   2  * Support file for nvptx in newlib.
   3  * Copyright (c) 2014-2018 Mentor Graphics.
   4  *
   5  * The authors hereby grant permission to use, copy, modify, distribute,
   6  * and license this software and its documentation for any purpose, provided
   7  * that existing copyright notices are retained in all copies and that this
   8  * notice is included verbatim in any distributions. No written agreement,
   9  * license, or royalty fee is required for any of the authorized uses.
  10  * Modifications to this software may be copyrighted by their authors
  11  * and need not follow the licensing terms described here, provided that
  12  * the new terms are clearly indicated on the first page of each file where
  13  * they apply.
  14  */
  15
  16 #include <unistd.h>
  17 #include <stdlib.h>
  18
  19 /* Sadly, PTX doesn't support weak declarations, only weak
  20    definitions.  Weakly define it here in case we're not using crt0
  21    (for instance in offloading).  You probably shouldn't be calling
  22    'exit' in an offloaded region anyway, but that'd be a runtime
  23    error, not a link error.  */
  24 int *__attribute((weak)) __exitval_ptr;
  25
  26 void __attribute__((noreturn))
  27 _exit (int status)
  28 {
  29   if (__exitval_ptr)
  30     {
  31       *__exitval_ptr = status;
  32       for (;;)
  33         asm ("exit;" ::: "memory");
  34     }
  35   else /* offloading */
  36     {
  37       /* Map to 'abort'; see <https://gcc.gnu.org/PR85463>
  38          '[nvptx] "exit" in offloaded region doesn't terminate process'.  */
  39       abort ();
  40     }
  41 }