sysdeps/m68k/fpu/fedisblxcpt.c

   1 /* Disable floating-point exceptions.
   2    Copyright (C) 2000-2023 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    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <fenv.h>
  20
  21 int
  22 fedisableexcept (int excepts)
  23 {
  24   unsigned int old_exc, new_exc;
  25
  26   /* Get the current control register contents.  */
  27   __asm__ ("fmove%.l %!,%0" : "=dm" (new_exc));
  28
  29   old_exc = (new_exc >> 6) & FE_ALL_EXCEPT;
  30
  31   excepts &= FE_ALL_EXCEPT;
  32
  33   new_exc &= ~(excepts << 6);
  34   __asm__ ("fmove%.l %0,%!" : : "dm" (new_exc));
  35
  36   return old_exc;
  37 }