sysdeps/hppa/fpu/feholdexcpt.c

   1 /* Store current floating-point environment and clear exceptions.
   2    Copyright (C) 2000 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by David Huggins-Daines <dhd@debian.org>, 2000
   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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <fenv.h>
  22 #include <string.h>
  23
  24 int
  25 feholdexcept (fenv_t *envp)
  26 {
  27   fenv_t clear;
  28   fenv_t * _regs = envp;
  29
  30   /* Store the environment.  */
  31   __asm__ (
  32            "fstd,ma %%fr0,8(%1)\n"
  33            "fstd,ma %%fr1,8(%1)\n"
  34            "fstd,ma %%fr2,8(%1)\n"
  35            "fstd %%fr3,0(%1)\n"
  36            : "=m" (*_regs), "+r" (_regs));
  37   memcpy (&clear, envp, sizeof (clear));
  38
  39   /* Now clear all exceptions.  */
  40   clear.__status_word &= ~(FE_ALL_EXCEPT << 27);
  41   memset (clear.__exception, 0, sizeof (clear.__exception));
  42
  43   /* And set all exceptions to non-stop.  */
  44   clear.__status_word &= ~FE_ALL_EXCEPT;
  45
  46   /* Load the new environment. */
  47   _regs = &clear;
  48   __asm__ (
  49            "fldd,ma 8(%0),%%fr0\n"
  50            "fldd,ma 8(%0),%%fr1\n"
  51            "fldd,ma 8(%0),%%fr2\n"
  52            "fldd 0(%0),%%fr3\n"
  53            : : "r" (_regs));
  54
  55   return 0;
  56 }