117 lines
4.3 KiB
C
117 lines
4.3 KiB
C
/* $NetBSD: fenv.h,v 1.1 2010/07/31 21:47:54 joerg Exp $ */
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/*-
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* Copyright (c) 2004-2005 David Schultz <das (at) 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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#ifndef _X86_FENV_H_
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#define _X86_FENV_H_
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#include <sys/stdint.h>
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#include <i386/npx.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 /* 000000000001 */
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#define FE_DENORMAL 0x02 /* 000000000010 */
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#define FE_DIVBYZERO 0x04 /* 000000000100 */
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#define FE_OVERFLOW 0x08 /* 000000001000 */
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#define FE_UNDERFLOW 0x10 /* 000000010000 */
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#define FE_INEXACT 0x20 /* 000000100000 */
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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_DIVBYZERO | FE_DENORMAL | FE_INEXACT | \
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FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
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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 /* 000000000000 */
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#define FE_DOWNWARD 0x400 /* 010000000000 */
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#define FE_UPWARD 0x800 /* 100000000000 */
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#define FE_TOWARDZERO 0xC00 /* 110000000000 */
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/*
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* As compared to the x87 control word, the SSE unit's control has the rounding
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* control bits offset by 3 and the exception mask bits offset by 7
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*/
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#define __X87_ROUND_MASK 0xC00 /* 110000000000 */
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#define __SSE_ROUND_SHIFT 3
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#define __SSE_EMASK_SHIFT 7
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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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uint16_t control; /* Control word register */
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uint16_t unused1;
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uint16_t status; /* Status word register */
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uint16_t unused2;
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uint16_t tag; /* Tag word register */
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uint16_t unused3;
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uint32_t others[4]; /* EIP, Pointer Selector, etc */
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} x87;
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uint32_t mxcsr; /* Control and 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.
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*/
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extern fenv_t __fe_dfl_env;
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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 uint32_t fexcept_t;
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#endif /* ! _X86_FENV_H_ */
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