sysdeps/m68k/fpu/feholdexcpt.c

   1 /* Store current floating-point environment and clear exceptions.
   2    Copyright (C) 1997-2024 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 __feholdexcept (fenv_t *envp)
  23 {
  24   fexcept_t fpcr, fpsr;
  25
  26   /* Store the environment.  */
  27 #ifdef __mcoldfire__
  28   __asm__ ("fmove%.l %/fpcr,%0" : "=dm" (envp->__control_register));
  29   __asm__ ("fmove%.l %/fpsr,%0" : "=dm" (envp->__status_register));
  30   __asm__ ("fmove%.l %/fpiar,%0" : "=dm" (envp->__instruction_address));
  31 #else
  32   __asm__ ("fmovem%.l %/fpcr/%/fpsr/%/fpiar,%0" : "=m" (*envp));
  33 #endif
  34
  35   /* Now clear all exceptions.  */
  36   fpsr = envp->__status_register & ~FE_ALL_EXCEPT;
  37   __asm__ __volatile__ ("fmove%.l %0,%/fpsr" : : "dm" (fpsr));
  38   /* And set all exceptions to non-stop.  */
  39   fpcr = envp->__control_register & ~(FE_ALL_EXCEPT << 6);
  40   __asm__ __volatile__ ("fmove%.l %0,%!" : : "dm" (fpcr));
  41
  42   return 0;
  43 }
  44 libm_hidden_def (__feholdexcept)
  45 weak_alias (__feholdexcept, feholdexcept)
  46 libm_hidden_weak (feholdexcept)