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glibc  2.9
feholdexcpt.c
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00001 /* Store current floating-point environment and clear exceptions.
00002    Copyright (C) 1997, 1999 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004    Contributed by Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
00005 
00006    The GNU C Library is free software; you can redistribute it and/or
00007    modify it under the terms of the GNU Lesser General Public
00008    License as published by the Free Software Foundation; either
00009    version 2.1 of the License, or (at your option) any later version.
00010 
00011    The GNU C Library is distributed in the hope that it will be useful,
00012    but WITHOUT ANY WARRANTY; without even the implied warranty of
00013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014    Lesser General Public License for more details.
00015 
00016    You should have received a copy of the GNU Lesser General Public
00017    License along with the GNU C Library; if not, write to the Free
00018    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00019    02111-1307 USA.  */
00020 
00021 #include <fenv.h>
00022 
00023 int
00024 feholdexcept (fenv_t *envp)
00025 {
00026   fexcept_t fpcr, fpsr;
00027 
00028   /* Store the environment.  */
00029 #ifdef __mcoldfire__
00030   __asm__ ("fmove%.l %/fpcr,%0" : "=dm" (envp->__control_register));
00031   __asm__ ("fmove%.l %/fpsr,%0" : "=dm" (envp->__status_register));
00032   __asm__ ("fmove%.l %/fpiar,%0" : "=dm" (envp->__instruction_address));
00033 #else
00034   __asm__ ("fmovem%.l %/fpcr/%/fpsr/%/fpiar,%0" : "=m" (*envp));
00035 #endif
00036 
00037   /* Now clear all exceptions.  */
00038   fpsr = envp->__status_register & ~FE_ALL_EXCEPT;
00039   __asm__ __volatile__ ("fmove%.l %0,%/fpsr" : : "dm" (fpsr));
00040   /* And set all exceptions to non-stop.  */
00041   fpcr = envp->__control_register & ~(FE_ALL_EXCEPT << 6);
00042   __asm__ __volatile__ ("fmove%.l %0,%!" : : "dm" (fpcr));
00043 
00044   return 0;
00045 }
00046 libm_hidden_def (feholdexcept);