sysdeps/powerpc/powerpc32/e500/nofpu/fe_note_change.c

   1 /* Note a change to floating-point exceptions.
   2    Copyright (C) 2013-2014 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 #include <sysdep.h>
  21 #include <sys/prctl.h>
  22
  23 /* Inform the kernel of a change to floating-point exceptions.  */
  24
  25 void
  26 __fe_note_change (void)
  27 {
  28   int pflags, r;
  29   INTERNAL_SYSCALL_DECL (err);
  30
  31   r = INTERNAL_SYSCALL (prctl, err, 2, PR_GET_FPEXC, &pflags);
  32   if (INTERNAL_SYSCALL_ERROR_P (r, err))
  33     return;
  34   if ((pflags & PR_FP_EXC_SW_ENABLE) == 0)
  35     INTERNAL_SYSCALL (prctl, err, 2, PR_SET_FPEXC,
  36                       pflags | PR_FP_EXC_SW_ENABLE);
  37 }
  38
  39 libm_hidden_def (__fe_note_change)