1  /* Install given floating-point environment.
       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  __fesetenv (const fenv_t *envp)
      23  {
      24    fenv_t temp;
      25  
      26    /* Install the environment specified by ENVP.  But there are a few
      27       values which we do not want to come from the saved environment.
      28       Therefore, we get the current environment and replace the values
      29       we want to use from the environment specified by the parameter.  */
      30  #ifdef __mcoldfire__
      31    __asm__ ("fmove%.l %/fpcr,%0" : "=dm" (temp.__control_register));
      32    __asm__ ("fmove%.l %/fpsr,%0" : "=dm" (temp.__status_register));
      33    __asm__ ("fmove%.l %/fpiar,%0" : "=dm" (temp.__instruction_address));
      34  #else
      35    __asm__ ("fmovem%.l %/fpcr/%/fpsr/%/fpiar,%0" : "=m" (*&temp));
      36  #endif
      37  
      38    temp.__status_register &= ~FE_ALL_EXCEPT;
      39    temp.__control_register &= ~((FE_ALL_EXCEPT << 6) | FE_UPWARD);
      40    if (envp == FE_DFL_ENV)
      41      ;
      42    else if (envp == FE_NOMASK_ENV)
      43      temp.__control_register |= FE_ALL_EXCEPT << 6;
      44    else
      45      {
      46        temp.__control_register |= (envp->__control_register
      47  				  & ((FE_ALL_EXCEPT << 6) | FE_UPWARD));
      48        temp.__status_register |= envp->__status_register & FE_ALL_EXCEPT;
      49      }
      50  
      51  #ifdef __mcoldfire__
      52    __asm__ __volatile__ ("fmove%.l %0,%/fpiar"
      53  			:: "dm" (temp.__instruction_address));
      54    __asm__ __volatile__ ("fmove%.l %0,%/fpcr"
      55  			:: "dm" (temp.__control_register));
      56    __asm__ __volatile__ ("fmove%.l %0,%/fpsr"
      57  			:: "dm" (temp.__status_register));
      58  #else
      59    __asm__ __volatile__ ("fmovem%.l %0,%/fpcr/%/fpsr/%/fpiar" : : "m" (*&temp));
      60  #endif
      61  
      62    /* Success.  */
      63    return 0;
      64  }
      65  
      66  #include <shlib-compat.h>
      67  #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
      68  strong_alias (__fesetenv, __old_fesetenv)
      69  compat_symbol (libm, __old_fesetenv, fesetenv, GLIBC_2_1);
      70  #endif
      71  
      72  libm_hidden_def (__fesetenv)
      73  libm_hidden_ver (__fesetenv, fesetenv)
      74  versioned_symbol (libm, __fesetenv, fesetenv, GLIBC_2_2);