libgcc/config/nvptx/crt0.c

   1 /* Copyright (C) 2014-2019 Free Software Foundation, Inc.
   2
   3    This file is free software; you can redistribute it and/or modify it
   4    under the terms of the GNU General Public License as published by the
   5    Free Software Foundation; either version 3, or (at your option) any
   6    later version.
   7
   8    This file is distributed in the hope that it will be useful, but
   9    WITHOUT ANY WARRANTY; without even the implied warranty of
  10    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11    General Public License for more details.
  12
  13    Under Section 7 of GPL version 3, you are granted additional
  14    permissions described in the GCC Runtime Library Exception, version
  15    3.1, as published by the Free Software Foundation.
  16
  17    You should have received a copy of the GNU General Public License and
  18    a copy of the GCC Runtime Library Exception along with this program;
  19    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  20    <http://www.gnu.org/licenses/>.  */
  21
  22 int *__exitval_ptr;
  23
  24 extern void __attribute__((noreturn)) exit (int status);
  25 extern int main (int, void **);
  26
  27 /* Always setup soft stacks to allow testing with -msoft-stack but without
  28    -mgomp.  32 is the maximum number of warps in a CTA: the definition here
  29    must match the external declaration emitted by the compiler.  */
  30 void *__nvptx_stacks[32] __attribute__((shared,nocommon));
  31
  32 /* Likewise for -muniform-simt.  */
  33 unsigned __nvptx_uni[32] __attribute__((shared,nocommon));
  34
  35 void __attribute__((kernel))
  36 __main (int *rval_ptr, int argc, void **argv)
  37 {
  38   __exitval_ptr = rval_ptr;
  39   /* Store something non-zero, so the host knows something went wrong,
  40      if we fail to reach exit properly.   */
  41   if (rval_ptr)
  42     *rval_ptr = 255;
  43
  44   static char stack[131072] __attribute__((aligned(8)));
  45   __nvptx_stacks[0] = stack + sizeof stack;
  46   __nvptx_uni[0] = 0;
  47
  48   exit (main (argc, argv));
  49 }