1  /* gmp_errno, __gmp_exception -- exception handling and reporting.
       2  
       3     THE FUNCTIONS IN THIS FILE, APART FROM gmp_errno, ARE FOR INTERNAL USE
       4     ONLY.  THEY'RE ALMOST CERTAIN TO BE SUBJECT TO INCOMPATIBLE CHANGES OR
       5     DISAPPEAR COMPLETELY IN FUTURE GNU MP RELEASES.
       6  
       7  Copyright 2000, 2001, 2003, 2021 Free Software Foundation, Inc.
       8  
       9  This file is part of the GNU MP Library.
      10  
      11  The GNU MP Library is free software; you can redistribute it and/or modify
      12  it under the terms of either:
      13  
      14    * the GNU Lesser General Public License as published by the Free
      15      Software Foundation; either version 3 of the License, or (at your
      16      option) any later version.
      17  
      18  or
      19  
      20    * the GNU General Public License as published by the Free Software
      21      Foundation; either version 2 of the License, or (at your option) any
      22      later version.
      23  
      24  or both in parallel, as here.
      25  
      26  The GNU MP Library is distributed in the hope that it will be useful, but
      27  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
      28  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
      29  for more details.
      30  
      31  You should have received copies of the GNU General Public License and the
      32  GNU Lesser General Public License along with the GNU MP Library.  If not,
      33  see https://www.gnu.org/licenses/.  */
      34  
      35  #include <stdlib.h>
      36  
      37  #include <signal.h>
      38  
      39  #include "gmp-impl.h"
      40  
      41  int gmp_errno = 0;
      42  
      43  
      44  /* Use SIGFPE on systems which have it. Otherwise, deliberate divide
      45     by zero, which triggers an exception on most systems. On those
      46     where it doesn't, for example power and powerpc, use abort instead. */
      47  void
      48  __gmp_exception (int error_bit)
      49  {
      50    gmp_errno |= error_bit;
      51  #ifdef SIGFPE
      52    raise (SIGFPE);
      53  #else
      54    __gmp_junk = 10 / __gmp_0;
      55  #endif
      56    abort ();
      57  }
      58  
      59  
      60  /* These functions minimize the amount of code required in functions raising
      61     exceptions.  Since they're "noreturn" and don't take any parameters, a
      62     test and call might even come out as a simple conditional jump.  */
      63  void
      64  __gmp_sqrt_of_negative (void)
      65  {
      66    __gmp_exception (GMP_ERROR_SQRT_OF_NEGATIVE);
      67  }
      68  void
      69  __gmp_divide_by_zero (void)
      70  {
      71    __gmp_exception (GMP_ERROR_DIVISION_BY_ZERO);
      72  }
      73  void
      74  __gmp_overflow_in_mpz (void)
      75  {
      76    __gmp_exception (GMP_ERROR_MPZ_OVERFLOW);
      77  }