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+/*-
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+ * Copyright (c) 2004-2011 David Schultz <das@FreeBSD.ORG>
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+ * All rights reserved.
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+ *
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+ * Redistribution and use in source and binary forms, with or without
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+ * modification, are permitted provided that the following conditions
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+ * are met:
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+ * 1. Redistributions of source code must retain the above copyright
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+ * notice, this list of conditions and the following disclaimer.
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+ * 2. Redistributions in binary form must reproduce the above copyright
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+ * notice, this list of conditions and the following disclaimer in the
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+ * documentation and/or other materials provided with the distribution.
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+ *
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+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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+ * SUCH DAMAGE.
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+ *
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+ * $FreeBSD$
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+ */
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+
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+#ifndef _FENV_H_
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+#error "This file is meant to be included only by <fenv.h>."
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+#endif
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+
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+/*
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+ * This file implements the functionality of <fenv.h> on platforms that
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+ * lack an FPU and use softfloat in libc for floating point. To use it,
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+ * you must write an <fenv.h> that provides the following:
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+ *
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+ * - a typedef for fenv_t, which may be an integer or struct type
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+ * - a typedef for fexcept_t (XXX This file assumes fexcept_t is a
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+ * simple integer type containing the exception mask.)
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+ * - definitions of FE_* constants for the five exceptions and four
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+ * rounding modes in IEEE 754, as described in fenv(3)
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+ * - a definition, and the corresponding external symbol, for FE_DFL_ENV
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+ * - a macro __set_env(env, flags, mask, rnd), which sets the given fenv_t
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+ * from the exception flags, mask, and rounding mode
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+ * - macros __env_flags(env), __env_mask(env), and __env_round(env), which
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+ * extract fields from an fenv_t
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+ * - a definition of __fenv_static
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+ *
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+ * If the architecture supports an optional FPU, it's recommended that you
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+ * define fenv_t and fexcept_t to match the hardware ABI. Otherwise, it
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+ * doesn't matter how you define them.
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+ */
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+
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+extern int __softfloat_float_exception_flags;
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+extern int __softfloat_float_exception_mask;
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+extern int __softfloat_float_rounding_mode;
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+void __softfloat_float_raise(int);
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+
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+__fenv_static inline int
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+feclearexcept(int __excepts)
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+{
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+
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+ __softfloat_float_exception_flags &= ~__excepts;
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+ return (0);
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+}
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+
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+__fenv_static inline int
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+fegetexceptflag(fexcept_t *__flagp, int __excepts)
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+{
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+
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+ *__flagp = __softfloat_float_exception_flags & __excepts;
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+ return (0);
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+}
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+
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+__fenv_static inline int
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+fesetexceptflag(const fexcept_t *__flagp, int __excepts)
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+{
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+
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+ __softfloat_float_exception_flags &= ~__excepts;
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+ __softfloat_float_exception_flags |= *__flagp & __excepts;
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+ return (0);
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+}
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+
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+__fenv_static inline int
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+feraiseexcept(int __excepts)
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+{
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+
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+ __softfloat_float_raise(__excepts);
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+ return (0);
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+}
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+
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+__fenv_static inline int
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+fetestexcept(int __excepts)
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+{
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+
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+ return (__softfloat_float_exception_flags & __excepts);
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+}
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+
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+__fenv_static inline int
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+fegetround(void)
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+{
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+
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+ return (__softfloat_float_rounding_mode);
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+}
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+
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+__fenv_static inline int
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+fesetround(int __round)
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+{
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+
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+ __softfloat_float_rounding_mode = __round;
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+ return (0);
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+}
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+
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+__fenv_static inline int
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+fegetenv(fenv_t *__envp)
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+{
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+
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+ __set_env(*__envp, __softfloat_float_exception_flags,
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+ __softfloat_float_exception_mask, __softfloat_float_rounding_mode);
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+ return (0);
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+}
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+
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+__fenv_static inline int
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+feholdexcept(fenv_t *__envp)
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+{
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+ fenv_t __env;
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+
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+ fegetenv(__envp);
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+ __softfloat_float_exception_flags = 0;
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+ __softfloat_float_exception_mask = 0;
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+ return (0);
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+}
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+
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+__fenv_static inline int
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+fesetenv(const fenv_t *__envp)
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+{
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+
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+ __softfloat_float_exception_flags = __env_flags(*__envp);
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+ __softfloat_float_exception_mask = __env_mask(*__envp);
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+ __softfloat_float_rounding_mode = __env_round(*__envp);
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+ return (0);
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+}
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+
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+__fenv_static inline int
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+feupdateenv(const fenv_t *__envp)
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+{
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+ int __oflags = __softfloat_float_exception_flags;
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+
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+ fesetenv(__envp);
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+ feraiseexcept(__oflags);
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+ return (0);
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+}
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+
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+#if __BSD_VISIBLE
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+
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+/* We currently provide no external definitions of the functions below. */
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+
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+__fenv_static inline int
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+feenableexcept(int __mask)
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+{
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+ int __omask = __softfloat_float_exception_mask;
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+
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+ __softfloat_float_exception_mask |= __mask;
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+ return (__omask);
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+}
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+
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+__fenv_static inline int
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+fedisableexcept(int __mask)
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+{
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+ int __omask = __softfloat_float_exception_mask;
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+
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+ __softfloat_float_exception_mask &= ~__mask;
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+ return (__omask);
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+}
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+
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+__fenv_static inline int
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+fegetexcept(void)
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+{
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+
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+ return (__softfloat_float_exception_mask);
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+}
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+
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+#endif /* __BSD_VISIBLE */
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Radovan Birdic