sysdeps/powerpc/fraiseexcpt.c

   1 /* Raise given exceptions.
   2    Copyright (C) 1997 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 Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    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    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <fenv_libc.h>
  21
  22 #undef feraiseexcept
  23 void
  24 feraiseexcept (int excepts)
  25 {
  26   fenv_union_t u;
  27
  28   /* Raise exceptions represented by EXCEPTS.  It is the responsibility of
  29      the OS to ensure that if multiple exceptions occur they are fed back
  30      to this process in the proper way; this can happen in hardware,
  31      anyway (in particular, inexact with overflow or underflow). */
  32
  33   /* Get the current state.  */
  34   u.fenv = fegetenv_register ();
  35
  36   /* Add the exceptions */
  37   u.l[1] = (u.l[1]
  38             | excepts & FPSCR_STICKY_BITS
  39             /* Turn FE_INVALID into FE_INVALID_SOFTWARE.  */
  40             | (excepts >> (31 - FPSCR_VX) - (31 - FPSCR_VXSOFT)
  41                & FE_INVALID_SOFTWARE));
  42
  43   /* Store the new status word (along with the rest of the environment),
  44      triggering any appropriate exceptions.  */
  45   fesetenv_register (u.fenv);
  46
  47   if ((excepts & FE_INVALID)
  48       /* For some reason, some PowerPC chips (the 601, in particular)
  49          don't have FE_INVALID_SOFTWARE implemented.  Detect this
  50          case and raise FE_INVALID_SNAN instead.  */
  51       && !fetestexcept (FE_INVALID))
  52     set_fpscr_bit (FPSCR_VXSNAN);
  53 }