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glibc  2.9
fegetenv.c
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00001 /* Store current floating-point environment.
00002    Copyright (C) 1997,99,2000,01 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004    Contributed by Richard Henderson <rth@tamu.edu>, 1997
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_libc.h>
00022 
00023 int
00024 __fegetenv (fenv_t *envp)
00025 {
00026   unsigned long int fpcr;
00027   unsigned long int swcr;
00028 
00029   /* Get status from software and hardware.  Note that we don't need an
00030      excb because the callsys is an implied trap barrier.  */
00031   swcr = __ieee_get_fp_control ();
00032   __asm__ __volatile__ ("mf_fpcr %0" : "=f" (fpcr));
00033 
00034   /* Merge the two bits of information.  */
00035   *envp = ((fpcr & FPCR_ROUND_MASK) | (swcr & SWCR_ALL_MASK));
00036 
00037   /* Success.  */
00038   return 0;
00039 }
00040 
00041 #include <shlib-compat.h>
00042 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
00043 strong_alias (__fegetenv, __old_fegetenv)
00044 compat_symbol (libm, __old_fegetenv, fegetenv, GLIBC_2_1);
00045 #endif
00046 
00047 versioned_symbol (libm, __fegetenv, fegetenv, GLIBC_2_2);