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https://github.com/intel/linux-sgx
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Li, Xun
140 lines
4.7 KiB
C
140 lines
4.7 KiB
C
/* $OpenBSD: fenv.h,v 1.2 2011/05/25 21:46:49 martynas Exp $ */
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/* $NetBSD: fenv.h,v 1.2.4.1 2011/02/08 16:18:55 bouyer Exp $ */
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/*
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* Copyright (c) 2010 The NetBSD Foundation, Inc.
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _FENV_H_
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#define _FENV_H_
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#include <sys/cdefs.h>
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/*
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* Each symbol representing a floating point exception expands to an integer
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* constant expression with values, such that bitwise-inclusive ORs of _all
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* combinations_ of the constants result in distinct values.
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*
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* We use such values that allow direct bitwise operations on FPU/SSE registers.
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*/
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#define FE_INVALID 0x01
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#define FE_DENORMAL 0x02
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#define FE_DIVBYZERO 0x04
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#define FE_OVERFLOW 0x08
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#define FE_UNDERFLOW 0x10
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#define FE_INEXACT 0x20
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/*
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* The following symbol is simply the bitwise-inclusive OR of all floating-point
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* exception constants defined above.
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*/
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#define FE_ALL_EXCEPT (FE_INVALID | FE_DENORMAL | FE_DIVBYZERO | \
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FE_OVERFLOW | FE_UNDERFLOW | FE_INEXACT)
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#define _SSE_MASK_SHIFT 7
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/*
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* Each symbol representing the rounding direction, expands to an integer
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* constant expression whose value is distinct non-negative value.
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*
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* We use such values that allow direct bitwise operations on FPU/SSE registers.
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*/
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#define FE_TONEAREST 0x000
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#define FE_DOWNWARD 0x400
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#define FE_UPWARD 0x800
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#define FE_TOWARDZERO 0xc00
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/*
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* The following symbol is simply the bitwise-inclusive OR of all floating-point
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* rounding direction constants defined above.
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*/
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#define _X87_ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | FE_UPWARD | \
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FE_TOWARDZERO)
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#define _SSE_ROUND_SHIFT 3
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/*
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* fenv_t represents the entire floating-point environment.
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*/
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typedef struct {
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struct {
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unsigned int __control; /* Control word register */
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unsigned int __status; /* Status word register */
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unsigned int __tag; /* Tag word register */
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unsigned int __others[4]; /* EIP, Pointer Selector, etc */
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} __x87;
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unsigned int __mxcsr; /* Control, status register */
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} fenv_t;
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/*
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* The following constant represents the default floating-point environment
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* (that is, the one installed at program startup) and has type pointer to
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* const-qualified fenv_t.
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*
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* It can be used as an argument to the functions within the <fenv.h> header
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* that manage the floating-point environment, namely fesetenv() and
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* feupdateenv().
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*/
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__BEGIN_DECLS
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extern fenv_t __fe_dfl_env;
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__END_DECLS
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#define FE_DFL_ENV ((const fenv_t *)&__fe_dfl_env)
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/*
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* fexcept_t represents the floating-point status flags collectively, including
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* any status the implementation associates with the flags.
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*
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* A floating-point status flag is a system variable whose value is set (but
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* never cleared) when a floating-point exception is raised, which occurs as a
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* side effect of exceptional floating-point arithmetic to provide auxiliary
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* information.
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*
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* A floating-point control mode is a system variable whose value may be set by
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* the user to affect the subsequent behavior of floating-point arithmetic.
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*/
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typedef unsigned int fexcept_t;
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__BEGIN_DECLS
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int feclearexcept(int);
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int fegetexceptflag(fexcept_t *, int);
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int feraiseexcept(int);
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int fesetexceptflag(const fexcept_t *, int);
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int fetestexcept(int);
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int fegetround(void);
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int fesetround(int);
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int fegetenv(fenv_t *);
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int feholdexcept(fenv_t *);
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int fesetenv(const fenv_t *);
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int feupdateenv(const fenv_t *);
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int feenableexcept(int);
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int fedisableexcept(int);
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int fegetexcept(void);
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__END_DECLS
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#endif /* ! _FENV_H_ */
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