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Diffstat (limited to 'sysdeps/alpha/fpu/fegetenv.c')
-rw-r--r--sysdeps/alpha/fpu/fegetenv.c37
1 files changed, 37 insertions, 0 deletions
diff --git a/sysdeps/alpha/fpu/fegetenv.c b/sysdeps/alpha/fpu/fegetenv.c
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+++ b/sysdeps/alpha/fpu/fegetenv.c
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+/* Store current floating-point environment.
+ Copyright (C) 1997 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Richard Henderson <rth@tamu.edu>, 1997
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include <fenv.h>
+
+void
+fegetenv (fenv_t *envp)
+{
+ unsigned long fpcr, swcr;
+
+ /* Get status from software and hardware. Note that we don't need an
+ excb because the callsys is an implied trap barrier. */
+ swcr = __ieee_get_fp_control();
+ __asm__ __volatile__("mf_fpcr %0" : "=f"(fpcr));
+
+ /* Merge the two bits of information. The magic number at the end is
+ the exception enable mask. */
+
+ *envp = (fpcr & (3UL << 58)) | (swcr & (FE_ALL_EXCEPT | 0x3e));
+}