114 lines
4.3 KiB
C
114 lines
4.3 KiB
C
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/*
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(c) Copyright 2019 Joel Sherrill <joel@rtems.org
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(c) Copyright 2019 Craig Howlang <craig.howland@caci.com>
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All rights reserved.
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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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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _SYS_FENV_H_
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#define _SYS_FENV_H_
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/*******************************************************************************
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* THIS FILE IS A TEMPLATE, INTENDED TO BE USED AS A STARTING POINT FOR
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* TARGET-SPECIFIC FLOATING-POINT IMPLEMENTATIONS. NOTES BELOW HIGHLIGHT THE
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* BASICS OF WHAT NEEDS TO BE DEFINED. THE DEFAULT IMPLEMTATION IS
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* DEGENERATE, WITH ALL FUNCTIONS RETURNING ERROR AND NO EXCEPTIONS AND NO
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* ROUNDING MODES DEFINED (SINCE NONE ARE SUPPORTED).
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* THE MACRO VALUES ARE EXAMPLES ONLY, ALTHOUGH TAKEN FROM A WORKING
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* IMPLEMENTATION.
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* REMOVE THIS NOTICE WHEN COPYING TO A REAL IMPLEMENTATION, REPLACING IT WITH
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* ANY TARGET-SPECIFIC NOTES OF INTEREST. THE FENV FUNCTION MAN PAGES POINT TO
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* THIS FILE AS A MEANS OF DETERMINING A FUNCTIONAL VS. NON-FUNCTIONAL
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* IMPLEMENTATION.
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******************************************************************************/
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/*
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* The following macros are to be defined if the respective exception is
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* supported by the implementation, each with a unique bit mask:
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*
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* FE_DIVBYZERO
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* FE_INEXACT
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* FE_INVALID
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* FE_OVERFLOW
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* FE_UNDERFLOW
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*
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* Other implementation-specific exceptions may be defined, and must start
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* with FE_ followed by a capital letter.
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*
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* FE_ALL_EXCEPT must be defined as the logical OR of all exceptions.
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*/
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//#define FE_DIVBYZERO 0x00000001
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//#define FE_INEXACT 0x00000002
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//#define FE_INVALID 0x00000004
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//#define FE_OVERFLOW 0x00000008
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//#define FE_UNDERFLOW 0x00000010
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//#define FE_ALL_EXCEPT \
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//(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW)
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#define FE_ALL_EXCEPT 0 /* NONE SUPPORTED IN PLACEHOLDER TEMPLATE */
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/*
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* The following macros are to be defined if the respective rounding
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* direction is supported by the implementation via the fegetround() and
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* fesetround() functions, each with a unique positive value.
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*
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* FE_DOWNWARD
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* FE_TONEAREST
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* FE_TOWARDZERO
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* FE_UPWARD
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*
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* Other implementation-specific rounding modes may be defined, and must start
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* with FE_ followed by a capital letter.
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*/
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//#define FE_DOWNWARD 1
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//#define FE_TONEAREST 2
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//#define FE_TOWARDZERO 3
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//#define FE_UPWARD 4
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/*
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* The following typedefs are required. These should be defined properly
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* to support the architecture specific implementation. See the C and
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* POSIX standards for details:
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*
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* fenv_t
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* fexcept_t
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*/
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typedef int fenv_t;
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typedef int fexcept_t;
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/*
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* Lastly, a FE_DFL_ENV macro must be defined, representing a pointer
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* to const fenv_t that contains the value of the default floating point
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* environment.
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*
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* NOTE: The extern'ed variable fe_default_env_p is an implementation
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* detail of this stub. FE_DFL_ENV must point to an instance of
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* fenv_t with the default fenv_t. The format of fenv_t and where
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* FE_DFL_ENV is are implementation specific.
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*/
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extern const fenv_t *_fe_dfl_env;
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#define FE_DFL_ENV _fe_dfl_env
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#endif /* _SYS_FENV_H_ */
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