sysdeps/powerpc/fpu/fraiseexcpt.c

   1 /* Raise given exceptions.
   2    Copyright (C) 1997-2016 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    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <fenv_libc.h>
  20
  21 #undef feraiseexcept
  22 int
  23 __feraiseexcept (int excepts)
  24 {
  25   fenv_union_t u;
  26
  27   /* Raise exceptions represented by EXCEPTS.  It is the responsibility of
  28      the OS to ensure that if multiple exceptions occur they are fed back
  29      to this process in the proper way; this can happen in hardware,
  30      anyway (in particular, inexact with overflow or underflow). */
  31
  32   /* Get the current state.  */
  33   u.fenv = fegetenv_register ();
  34
  35   /* Add the exceptions */
  36   u.l = (u.l
  37          | (excepts & FPSCR_STICKY_BITS)
  38          /* Turn FE_INVALID into FE_INVALID_SOFTWARE.  */
  39          | (excepts >> ((31 - FPSCR_VX) - (31 - FPSCR_VXSOFT))
  40             & FE_INVALID_SOFTWARE));
  41
  42   /* Store the new status word (along with the rest of the environment),
  43      triggering any appropriate exceptions.  */
  44   fesetenv_register (u.fenv);
  45
  46   if ((excepts & FE_INVALID))
  47     {
  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       u.fenv = fegetenv_register ();
  52       if ((u.l & FE_INVALID) == 0)
  53         set_fpscr_bit (FPSCR_VXSNAN);
  54     }
  55
  56   /* Success.  */
  57   return 0;
  58 }
  59
  60 #include <shlib-compat.h>
  61 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
  62 strong_alias (__feraiseexcept, __old_feraiseexcept)
  63 compat_symbol (libm, __old_feraiseexcept, feraiseexcept, GLIBC_2_1);
  64 #endif
  65
  66 libm_hidden_def (__feraiseexcept)
  67 libm_hidden_ver (__feraiseexcept, feraiseexcept)
  68 versioned_symbol (libm, __feraiseexcept, feraiseexcept, GLIBC_2_2);