1  /* Store current floating-point environment and clear exceptions.
       2     Copyright (C) 1997-2023 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  __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)