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glibc  2.9
feenablxcpt.c
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00001 /* Enable floating-point exceptions.
00002    Copyright (C) 2001, 2005 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004    Contributed by Philip Blundell <philb@gnu.org>, 2001.
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 General Public License
00017    along with GCC; see the file COPYING.  If not, write to the Free
00018    Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
00019    02110-1301, USA.  */
00020 
00021 #include <fenv.h>
00022 #include <fpu_control.h>
00023 
00024 #include <unistd.h>
00025 #include <ldsodefs.h>
00026 #include <dl-procinfo.h>
00027 #include <sysdep.h>
00028 
00029 int
00030 feenableexcept (int excepts)
00031 {
00032   if (GLRO (dl_hwcap) & HWCAP_ARM_VFP)
00033     {
00034       unsigned long int new_exc, old_exc;
00035 
00036       _FPU_GETCW(new_exc);
00037 
00038       old_exc = (new_exc >> FE_EXCEPT_SHIFT) & FE_ALL_EXCEPT;
00039 
00040       excepts &= FE_ALL_EXCEPT;
00041 
00042       new_exc |= (excepts << FE_EXCEPT_SHIFT);
00043 
00044       _FPU_SETCW(new_exc);
00045 
00046       return old_exc;
00047     }
00048 
00049   /* Unsupported, so return -1 for failure.  */
00050   return -1;
00051 }