205 lines
6.1 KiB
C
205 lines
6.1 KiB
C
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/*******************************************************************************
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* FILE NAME: FENV.h
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*
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* TITLE: These function prototypes and data type definitions for the Floating Point Exceptions (FPE).
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*
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* DATA_RIGHTS: Western Design Center and R & C Services Proprietary
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* Copyright(C) 1980-2004
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* All rights reserved. Reproduction in any manner,
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* in whole or in part, is strictly prohibited without
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* the prior written approval of R & C Services or
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* Western Design Center.
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*
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* DESCRIPTION: This file describes function prototypes and data type
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* definitions used for Floating Point Exceptions (FPE).
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*
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*
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* SPECIAL CONSIDERATIONS:
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* This is just Templates for REAL Hardware Math Coprocesser
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* The User Must enhance the existing code to mesh with their
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* Math Coprocesser interrupt vectors and registers.
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*
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* AUTHOR: R. Greenthal
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*
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*
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* CREATION DATE: March 27,2004
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*
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* REVISION HISTORY
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* Name Date Description
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* ------------ ---------- ----------------------------------------------
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* R. Greenthal 03/15/2004 Initial
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* 0x/xx/2004 Added
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*
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*******************************************************************************
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*/
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#ifndef _FENV_H
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#define _FENV_H
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/*
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*=========================== CONSTANTS & MACROS ===============================
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*/
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/* fexcept_t: a type for representing the floating-point exception flags
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collectively, including any status associated with the flags. */
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#define FE_DENORM_OP 0x02 /* 80x87, Not mentioned by NCEG */
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#define FE_STACK_FLT 0x40 /* 80x87, Not mentioned by NCEG */
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#define FE_ALL_EXCEPT ( FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID | FE_DENORM_OP )
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#define FE_FLTPREC 0x000
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#define FE_INVALIDPREC 0x100
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#define FE_DBLPREC 0x200
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#define FE_LDBLPREC 0x300
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/**********************************/
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/* Floating-Point Exception Flags */
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/**********************************/
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#define FE_INEXACT 0x02000000 /* inexact */
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#define FE_DIVBYZERO 0x04000000 /* divide-by-zero */
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#define FE_UNDERFLOW 0x08000000 /* underflow */
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#define FE_OVERFLOW 0x10000000 /* overflow */
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#define FE_INVALID 0x20000000 /* invalid */
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/****************************/
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/* Rounding Direction Modes */
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/****************************/
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#define FE_TONEAREST 0x00000000
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#define FE_TOWARDZERO 0x00000001
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#define FE_UPWARD 0x00000002
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#define FE_DOWNWARD 0x00000003
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#define FE_DFL_ENV &_FE_DFL_ENV /* pointer to default environment*/
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/*
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*============================= FUNCTION CALL PROTOTYPES ============================
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*/
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typedef unsigned char ftrap_t; // This may need resizing!
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/**********************************/
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/* Data Types */
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/**********************************/
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struct __fenv {
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unsigned long control;
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unsigned long status;
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unsigned long tags;
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unsigned long ip_offset;
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unsigned long opcode;
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unsigned long data_offset;
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unsigned long op_sel;
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};
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typedef struct __fenv fenv_t;
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struct __fexcept {
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int excepts;
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void *code_address;
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void *data_address;
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};
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typedef struct __fexcept fexcept_t;
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/* These may be like your FPE Vectors */
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struct fptraps {
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ftrap_t invalid;
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ftrap_t stack_flt;
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ftrap_t denorm_op;
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ftrap_t divbyzero;
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ftrap_t overflow;
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ftrap_t underflow;
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ftrap_t inexact;
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int trap_invalid;
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int trap_stack_flt;
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};
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/* A place to keep the unmasked "sticky" bits. */
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extern int sticky;
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extern fenv_t __default_fp_env;
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/************************************************************/
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/* Definition of pointer to IEEE default environment object */
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/************************************************************/
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extern fenv_t _FE_DFL_ENV; // default environment object
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/*******************************************************************************
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* This is just Templates for REAL Hardware Math Coprocesser
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* The User Must enhance the existing code to mesh with their
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* Math Coprocesser interrupt vectors and registers.
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********************************************************************************/
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/* fenv_t: a type for representing the entire floating-point environment. */
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/* fenv_t is not defined in detail by NCEG.
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For Linux, we use the FPU environment: */
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/*
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These eleven functions were defined in C99, and describe the handling of
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floating point rounding and exceptions (overflow, zero-divide etc.).
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*/
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/*******************************************************/
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/* Functions Controlling the Floating-Point Exceptions */
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/*******************************************************/
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void feclearexcept(int excepts);
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void fegetexceptflag(fexcept_t *flagp, int excepts);
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void feraiseexcept(int excepts);
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void fesetexceptflag(const fexcept_t *flagp, int excepts);
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int fetestexcept(int excepts);
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/**************************************/
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/* Controlling the Rounding Direction */
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/**************************************/
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int fegetround(void);
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int fesetround(int rounding_mode);
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/**********************************************/
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/* Controlling the Floating-Point Environment */
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/**********************************************/
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void fegetenv (fenv_t *envp);
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int feholdexcept (fenv_t *envp);
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void fesetenv (const fenv_t *envp);
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void feupdateenv (const fenv_t *envp);
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/*******************************************************/
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/*******************************************************/
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/* Extra */
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/* Functions Controlling the Floating-Point Precision */
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/*******************************************************/
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/*******************************************************/
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int fegetprecision(void);
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int fesetprecision(int prec);
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int fegetvector(ftrap_t *trap, int except);
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int fesetvector(ftrap_t *trap, int except);
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int fegettraps(void);
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int fedisabletraps(int excepts);
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int feenabletraps(int excepts);
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int __sigfpe_abort(char *s, void *p);
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void __set_sticky(int bits);
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#endif /* End of _FENV_H */
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/**************************************
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End of File FENV.H
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***************************************/
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