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diff --git a/newlib/libm/machine/riscv/fesetenv.c b/newlib/libm/machine/riscv/fesetenv.c
new file mode 100644
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+++ b/newlib/libm/machine/riscv/fesetenv.c
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+/*
+  (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/fegetenv.html
+ * Referred to as 'fegetenv.html below.
+ *
+ * "The fegetenv() function shall attempt to store the current
+ * floating-point environment in the object pointed to by envp.
+ *
+ * The fesetenv() function shall attempt to establish the
+ * floating-point environment represented by the object pointed to by
+ * envp. The argument envp shall point to an object set by a call to
+ * fegetenv() or feholdexcept(), or equal a floating-point environment
+ * macro. The fesetenv() function does not raise floating-point
+ * exceptions, but only installs the state of the floating-point
+ * status flags represented through its argument."
+ */
+
+int fesetenv(const fenv_t *envp)
+{
+
+#if __riscv_flen
+
+  /* Set environment (FCSR) */
+
+  fenv_t fcsr = *envp;
+  asm volatile("fscsr %0" : : "r"(fcsr));
+
+  /* Per 'fegetenv.html:
+   *
+   * "If the environment was successfully established, fesetenv()
+   * shall return zero. Otherwise, it shall return a non-zero value.
+   */
+
+#endif
+
+  return 0;
+}