1 files changed, 76 insertions, 0 deletions
diff --git a/newlib/libm/machine/riscv/fegetexceptflag.c b/newlib/libm/machine/riscv/fegetexceptflag.c
new file mode 100644
index 000000000..ab1b8a66b
--- /dev/null
+++ b/newlib/libm/machine/riscv/fegetexceptflag.c
@@ -0,0 +1,76 @@
+/*
+  (c) Copyright 2017 Michael R. Neilly
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions
+  are met:
+
+  * Redistributions of source code must retain the above copyright
+  notice, this list of conditions and the following disclaimer.
+
+  * Redistributions in binary form must reproduce the above copyright
+  notice, this list of conditions and the following disclaimer in the
+  documentation and/or other materials provided with the distribution.
+
+  * Neither the names of the copyright holders nor the names of their
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+  FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+  COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+  ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+  POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#include <fenv.h>
+
+/* This implementation is intended to comply with the following
+ * specification:
+ *
+ * http://pubs.opengroup.org/onlinepubs/009695399/functions/fegetexceptflag.html
+ * Referred to as 'fegetexceptflag.html below.
+ *
+ * "The fegetexceptflag() function shall attempt to store an
+ * implementation-defined representation of the states of the
+ * floating-point status flags indicated by the argument excepts in
+ * the object pointed to by the argument flagp."
+ */
+
+int fegetexceptflag(fexcept_t *flagp, int excepts)
+{
+
+#if __riscv_flen
+
+  /* Mask excepts to be sure only supported flag bits are set */
+
+  excepts &= FE_ALL_EXCEPT;
+
+  /* Get current exception flags */
+
+  fexcept_t flags;
+  asm volatile("frflags %0" : "=r"(flags));
+
+  /* Return the requested flags in flagp */
+
+  *flagp = flags & excepts;
+
+  /* Per 'fegetexceptflag.html:
+   *
+   * "If the representation was successfully stored, fegetexceptflag()
+   * shall return zero. Otherwise, it shall return a non-zero
+   * value."
+   */
+
+#endif
+
+  return 0;
+}