sysdeps/m68k/fpu/fesetenv.c

   1 /* Install given floating-point environment.
   2    Copyright (C) 1997,99,2000,01,02 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
   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
  23 int
  24 __fesetenv (const fenv_t *envp)
  25 {
  26   fenv_t temp;
  27
  28   /* Install the environment specified by ENVP.  But there are a few
  29      values which we do not want to come from the saved environment.
  30      Therefore, we get the current environment and replace the values
  31      we want to use from the environment specified by the parameter.  */
  32   __asm__ ("fmovem%.l %/fpcr/%/fpsr/%/fpiar,%0" : "=m" (*&temp));
  33
  34   temp.__status_register &= ~FE_ALL_EXCEPT;
  35   temp.__control_register &= ~((FE_ALL_EXCEPT << 6) | FE_UPWARD);
  36   if (envp == FE_DFL_ENV)
  37     ;
  38   else if (envp == FE_NOMASK_ENV)
  39     temp.__control_register |= FE_ALL_EXCEPT << 6;
  40   else
  41     {
  42       temp.__control_register |= (envp->__control_register
  43                                   & ((FE_ALL_EXCEPT << 6) | FE_UPWARD));
  44       temp.__status_register |= envp->__status_register & FE_ALL_EXCEPT;
  45     }
  46
  47   __asm__ __volatile__ ("fmovem%.l %0,%/fpcr/%/fpsr/%/fpiar" : : "m" (*&temp));
  48
  49   /* Success.  */
  50   return 0;
  51 }
  52
  53 #include <shlib-compat.h>
  54 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
  55 strong_alias (__fesetenv, __old_fesetenv)
  56 compat_symbol (libm, __old_fesetenv, fesetenv, GLIBC_2_1);
  57 #endif
  58
  59 libm_hidden_ver (__fesetenv, fesetenv)
  60 versioned_symbol (libm, __fesetenv, fesetenv, GLIBC_2_2);