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Floating point exception definitions.

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This commit is contained in:
Ulrich Drepper 1998-03-18 14:29:48 +00:00
parent fe0955cdc4
commit ed6b842088
1 changed files with 90 additions and 0 deletions
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sysdeps/arm/bits/fenv.h Normal file
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/* Copyright (C) 1997, 1998 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifndef _FENV_H
# error "Never use <bits/fenv.h> directly; include <fenv.h> instead."
#endif
/* Define bits representing the exception. We use the bit positions
of the appropriate bits in the FPU control word. */
enum
{
FE_INVALID = 0x01,
#define FE_INVALID FE_INVALID
__FE_DENORM = 0x02,
FE_DIVBYZERO = 0x04,
#define FE_DIVBYZERO FE_DIVBYZERO
FE_OVERFLOW = 0x08,
#define FE_OVERFLOW FE_OVERFLOW
FE_UNDERFLOW = 0x10,
#define FE_UNDERFLOW FE_UNDERFLOW
FE_INEXACT = 0x20
#define FE_INEXACT FE_INEXACT
};
#define FE_ALL_EXCEPT \
(FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
/* The ARM FPU supports all of the four defined rounding modes. We
use again the bit positions in the FPU control word as the values
for the appropriate macros. */
enum
{
FE_TONEAREST = 0,
#define FE_TONEAREST FE_TONEAREST
FE_DOWNWARD = 0x400,
#define FE_DOWNWARD FE_DOWNWARD
FE_UPWARD = 0x800,
#define FE_UPWARD FE_UPWARD
FE_TOWARDSZERO = 0xc00
#define FE_TOWARDSZERO FE_TOWARDSZERO
};
/* Type representing exception flags. */
typedef unsigned short int fexcept_t;
/* Type representing floating-point environment. This function corresponds
to the layout of the block written by the `fstenv'. */
typedef struct
{
unsigned short int control_word;
unsigned short int __unused1;
unsigned short int status_word;
unsigned short int __unused2;
unsigned short int tags;
unsigned short int __unused3;
unsigned int eip;
unsigned short int cs_selector;
unsigned int opcode:11;
unsigned int __unused4:5;
unsigned int data_offset;
unsigned short int data_selector;
unsigned short int __unused5;
}
fenv_t;
/* If the default argument is used we use this value. */
#define FE_DFL_ENV ((fenv_t *) -1)
#ifdef __USE_GNU
/* Floating-point environment where none of the exception is masked. */
# define FE_NOMASK_ENV ((fenv_t *) -2)
#endif