sysdeps/powerpc/nofpu/sim-full.c

   1 /* Software floating-point exception handling emulation.
   2    Copyright (C) 2002-2015 Free Software Foundation, Inc.
   3    Contributed by Aldy Hernandez <aldyh@redhat.com>, 2002.
   4    This file is part of the GNU C Library.
   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, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <signal.h>
  21 #include "soft-fp.h"
  22 #include "soft-supp.h"
  23
  24 /* Thread-local to store sticky exceptions.  */
  25 __thread int __sim_exceptions_thread __attribute__ ((nocommon));
  26 libc_hidden_data_def (__sim_exceptions_thread);
  27
  28 /* By default, no exceptions should trap.  */
  29 __thread int __sim_disabled_exceptions_thread = 0xffffffff;
  30 libc_hidden_data_def (__sim_disabled_exceptions_thread);
  31
  32 __thread int __sim_round_mode_thread __attribute__ ((nocommon));
  33 libc_hidden_data_def (__sim_round_mode_thread);
  34
  35 #if SIM_GLOBAL_COMPAT
  36 int __sim_exceptions_global __attribute__ ((nocommon));
  37 libc_hidden_data_def (__sim_exceptions_global);
  38 SIM_COMPAT_SYMBOL (__sim_exceptions_global, __sim_exceptions);
  39
  40 int __sim_disabled_exceptions_global = 0xffffffff;
  41 libc_hidden_data_def (__sim_disabled_exceptions_global);
  42 SIM_COMPAT_SYMBOL (__sim_disabled_exceptions_global,
  43                    __sim_disabled_exceptions);
  44
  45 int __sim_round_mode_global __attribute__ ((nocommon));
  46 libc_hidden_data_def (__sim_round_mode_global);
  47 SIM_COMPAT_SYMBOL (__sim_round_mode_global, __sim_round_mode);
  48 #endif
  49
  50 void
  51 __simulate_exceptions (int x)
  52 {
  53   __sim_exceptions_thread |= x;
  54   SIM_SET_GLOBAL (__sim_exceptions_global, __sim_exceptions_thread);
  55   if (x & ~__sim_disabled_exceptions_thread)
  56     raise (SIGFPE);
  57 }