1  /* Software floating-point exception handling emulation.
       2     Copyright (C) 2002-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library.  If not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <signal.h>
      20  #include "soft-fp.h"
      21  #include "soft-supp.h"
      22  
      23  /* Thread-local to store sticky exceptions.  */
      24  __thread int __sim_exceptions_thread;
      25  libc_hidden_tls_def (__sim_exceptions_thread);
      26  
      27  /* By default, no exceptions should trap.  */
      28  __thread int __sim_disabled_exceptions_thread = 0xffffffff;
      29  libc_hidden_tls_def (__sim_disabled_exceptions_thread);
      30  
      31  __thread int __sim_round_mode_thread;
      32  libc_hidden_tls_def (__sim_round_mode_thread);
      33  
      34  #if SIM_GLOBAL_COMPAT
      35  int __sim_exceptions_global;
      36  libc_hidden_data_def (__sim_exceptions_global);
      37  SIM_COMPAT_SYMBOL (__sim_exceptions_global, __sim_exceptions);
      38  
      39  int __sim_disabled_exceptions_global = 0xffffffff;
      40  libc_hidden_data_def (__sim_disabled_exceptions_global);
      41  SIM_COMPAT_SYMBOL (__sim_disabled_exceptions_global,
      42  		   __sim_disabled_exceptions);
      43  
      44  int __sim_round_mode_global;
      45  libc_hidden_data_def (__sim_round_mode_global);
      46  SIM_COMPAT_SYMBOL (__sim_round_mode_global, __sim_round_mode);
      47  #endif
      48  
      49  void
      50  __simulate_exceptions (int x)
      51  {
      52    __sim_exceptions_thread |= x;
      53    SIM_SET_GLOBAL (__sim_exceptions_global, __sim_exceptions_thread);
      54    if (x & ~__sim_disabled_exceptions_thread)
      55      raise (SIGFPE);
      56  }