- add C99 floating point environment, rounding and exception handling functions

  for i386. UCLIBC_HAS_FENV

1 files changed, 34 insertions, 0 deletions

diff --git a/libm/i386/fegetenv.c b/libm/i386/fegetenv.c
new file mode 100644
index 000000000..abbf179e0
--- /dev/null
+++ b/libm/i386/fegetenv.c
@@ -0,0 +1,34 @@
+/* Store current floating-point environment.
+   Copyright (C) 1997,1999,2000,2001,2003 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <fenv.h>
+
+int
+fegetenv (fenv_t *envp)
+{
+  __asm__ ("fnstenv %0" : "=m" (*envp));
+  /* And load it right back since the processor changes the mask.
+     Intel thought this opcode to be used in interrupt handlers which
+     would block all exceptions.  */
+  __asm__ ("fldenv %0" : : "m" (*envp));
+
+  /* Success.  */
+  return 0;
+}