sysdeps/powerpc/powerpc32/e500/nofpu/atomic-feupdateenv.c

   1 /* Install given floating-point environment and raise exceptions for
   2    atomic compound assignment.  e500 version.
   3    Copyright (C) 2004-2018 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library.  If not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <fenv_libc.h>
  21 #include <stdlib.h>
  22 #include <sysdep.h>
  23 #include <sys/prctl.h>
  24
  25 void
  26 __atomic_feupdateenv (const fenv_t *envp)
  27 {
  28   int exc;
  29   fenv_union_t u;
  30   INTERNAL_SYSCALL_DECL (err);
  31   int r;
  32
  33   /* Save the currently set exceptions.  */
  34   exc = fegetenv_register () & SPEFSCR_ALL_EXCEPT;
  35
  36   u.fenv = *envp;
  37
  38   fesetenv_register (u.l[1]);
  39   r = INTERNAL_SYSCALL (prctl, err, 2, PR_SET_FPEXC,
  40                         u.l[0] | PR_FP_EXC_SW_ENABLE);
  41   if (INTERNAL_SYSCALL_ERROR_P (r, err))
  42     abort ();
  43
  44   /* Raise (if appropriate) saved exceptions. */
  45   __feraiseexcept_soft (exc);
  46 }