ports/sysdeps/m68k/fpu/fesetenv.c

   1 /* Install given floating-point environment.
   2    Copyright (C) 1997-2014 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, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <fenv.h>
  21
  22 int
  23 __fesetenv (const fenv_t *envp)
  24 {
  25   fenv_t temp;
  26
  27   /* Install the environment specified by ENVP.  But there are a few
  28      values which we do not want to come from the saved environment.
  29      Therefore, we get the current environment and replace the values
  30      we want to use from the environment specified by the parameter.  */
  31 #ifdef __mcoldfire__
  32   __asm__ ("fmove%.l %/fpcr,%0" : "=dm" (temp.__control_register));
  33   __asm__ ("fmove%.l %/fpsr,%0" : "=dm" (temp.__status_register));
  34   __asm__ ("fmove%.l %/fpiar,%0" : "=dm" (temp.__instruction_address));
  35 #else
  36   __asm__ ("fmovem%.l %/fpcr/%/fpsr/%/fpiar,%0" : "=m" (*&temp));
  37 #endif
  38
  39   temp.__status_register &= ~FE_ALL_EXCEPT;
  40   temp.__control_register &= ~((FE_ALL_EXCEPT << 6) | FE_UPWARD);
  41   if (envp == FE_DFL_ENV)
  42     ;
  43   else if (envp == FE_NOMASK_ENV)
  44     temp.__control_register |= FE_ALL_EXCEPT << 6;
  45   else
  46     {
  47       temp.__control_register |= (envp->__control_register
  48                                   & ((FE_ALL_EXCEPT << 6) | FE_UPWARD));
  49       temp.__status_register |= envp->__status_register & FE_ALL_EXCEPT;
  50     }
  51
  52 #ifdef __mcoldfire__
  53   __asm__ __volatile__ ("fmove%.l %0,%/fpiar"
  54                         :: "dm" (temp.__instruction_address));
  55   __asm__ __volatile__ ("fmove%.l %0,%/fpcr"
  56                         :: "dm" (temp.__control_register));
  57   __asm__ __volatile__ ("fmove%.l %0,%/fpsr"
  58                         :: "dm" (temp.__status_register));
  59 #else
  60   __asm__ __volatile__ ("fmovem%.l %0,%/fpcr/%/fpsr/%/fpiar" : : "m" (*&temp));
  61 #endif
  62
  63   /* Success.  */
  64   return 0;
  65 }
  66
  67 #include <shlib-compat.h>
  68 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
  69 strong_alias (__fesetenv, __old_fesetenv)
  70 compat_symbol (libm, __old_fesetenv, fesetenv, GLIBC_2_1);
  71 #endif
  72
  73 libm_hidden_ver (__fesetenv, fesetenv)
  74 versioned_symbol (libm, __fesetenv, fesetenv, GLIBC_2_2);