diff --git a/libm/include/alpha/fenv.h b/libm/include/alpha/fenv.h
new file mode 100644
index 0000000..dc7bcb7
--- /dev/null
+++ b/libm/include/alpha/fenv.h
@@ -0,0 +1,185 @@
+/*-
+ * Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ *
+ * $FreeBSD: src/lib/msun/alpha/fenv.h,v 1.3 2005/03/16 19:03:44 das Exp $
+ */
+
+#ifndef	_FENV_H_
+#define	_FENV_H_
+
+#include <sys/_types.h>
+
+typedef	__uint64_t	fenv_t;
+typedef	__uint16_t	fexcept_t;
+
+/* Exception flags */
+#define	FE_INVALID	0x02
+#define	FE_DIVBYZERO	0x04
+#define	FE_OVERFLOW	0x08
+#define	FE_UNDERFLOW	0x10
+#define	FE_INEXACT	0x20
+#define	FE_INTOVF	0x40	/* not maskable */
+#define	FE_ALL_EXCEPT	(FE_DIVBYZERO | FE_INEXACT | FE_INTOVF | \
+			 FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
+
+/* Rounding modes */
+#define	FE_TOWARDZERO	0x00
+#define	FE_DOWNWARD	0x01
+#define	FE_TONEAREST	0x02
+#define	FE_UPWARD	0x03
+#define	_ROUND_MASK	(FE_TONEAREST | FE_DOWNWARD | \
+			 FE_UPWARD | FE_TOWARDZERO)
+#define	_ROUND_SHIFT	58
+
+#define	_FPUSW_SHIFT	51
+
+#define	__excb()	__asm __volatile("excb")
+#define	__mf_fpcr(__cw)	__asm __volatile("mf_fpcr %0" : "=f" (*(__cw)))
+#define	__mt_fpcr(__cw)	__asm __volatile("mt_fpcr %0" : : "f" (__cw))
+
+union __fpcr {
+	double __d;
+	fenv_t __bits;
+};
+
+__BEGIN_DECLS
+
+/* Default floating-point environment */
+extern const fenv_t	__fe_dfl_env;
+#define	FE_DFL_ENV	(&__fe_dfl_env)
+
+static __inline int
+feclearexcept(int __excepts)
+{
+	union __fpcr __r;
+
+	__excb();
+	__mf_fpcr(&__r.__d);
+	__r.__bits &= ~((fenv_t)__excepts << _FPUSW_SHIFT);
+	__mt_fpcr(__r.__d);
+	__excb();
+	return (0);
+}
+
+static __inline int
+fegetexceptflag(fexcept_t *__flagp, int __excepts)
+{
+	union __fpcr __r;
+
+	__excb();
+	__mf_fpcr(&__r.__d);
+	__excb();
+	*__flagp = (__r.__bits >> _FPUSW_SHIFT) & __excepts;
+	return (0);
+}
+
+static __inline int
+fesetexceptflag(const fexcept_t *__flagp, int __excepts)
+{
+	union __fpcr __r;
+	fenv_t __xflag, __xexcepts;
+
+	__xflag = (fenv_t)*__flagp << _FPUSW_SHIFT;
+	__xexcepts = (fenv_t)__excepts << _FPUSW_SHIFT;
+	__excb();
+	__mf_fpcr(&__r.__d);
+	__r.__bits &= ~__xexcepts;
+	__r.__bits |= __xflag & __xexcepts;
+	__mt_fpcr(__r.__d);
+	__excb();
+	return (0);
+}
+
+static __inline int
+feraiseexcept(int __excepts)
+{
+
+	/*
+	 * XXX Generating exceptions this way does not actually invoke
+	 * a userland trap handler when enabled, but neither do
+	 * arithmetic operations as far as I can tell.  Perhaps there
+	 * are more bugs in the kernel trap handler.
+	 */
+	fexcept_t __ex = __excepts;
+	fesetexceptflag(&__ex, __excepts);
+	return (0);
+}
+
+static __inline int
+fetestexcept(int __excepts)
+{
+	union __fpcr __r;
+
+	__excb();
+	__mf_fpcr(&__r.__d);
+	__excb();
+	return ((__r.__bits >> _FPUSW_SHIFT) & __excepts);
+}
+
+static __inline int
+fegetround(void)
+{
+	union __fpcr __r;
+
+	/*
+	 * No exception barriers should be required here if we assume
+	 * that only fesetround() can change the rounding mode.
+	 */
+	__mf_fpcr(&__r.__d);
+	return ((int)(__r.__bits >> _ROUND_SHIFT) & _ROUND_MASK);
+}
+
+static __inline int
+fesetround(int __round)
+{
+	union __fpcr __r;
+
+	if (__round & ~_ROUND_MASK)
+		return (-1);
+	__excb();
+	__mf_fpcr(&__r.__d);
+	__r.__bits &= ~((fenv_t)_ROUND_MASK << _ROUND_SHIFT);
+	__r.__bits |= (fenv_t)__round << _ROUND_SHIFT;
+	__mt_fpcr(__r.__d);
+	__excb();
+	return (0);
+}
+
+int	fegetenv(fenv_t *__envp);
+int	feholdexcept(fenv_t *__envp);
+int	fesetenv(const fenv_t *__envp);
+int	feupdateenv(const fenv_t *__envp);
+
+#if __BSD_VISIBLE
+
+int	feenableexcept(int __mask);
+int	fedisableexcept(int __mask);
+int	fegetexcept(void);
+
+#endif /* __BSD_VISIBLE */
+
+__END_DECLS
+
+#endif	/* !_FENV_H_ */