1/* Copyright (C) 1997-2025 Free Software Foundation, Inc.
  2   This file is part of the GNU C Library.
  3
  4   The GNU C Library is free software; you can redistribute it and/or
  5   modify it under the terms of the GNU Lesser General Public
  6   License as published by the Free Software Foundation; either
  7   version 2.1 of the License, or (at your option) any later version.
  8
  9   The GNU C Library is distributed in the hope that it will be useful,
 10   but WITHOUT ANY WARRANTY; without even the implied warranty of
 11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 12   Lesser General Public License for more details.
 13
 14   You should have received a copy of the GNU Lesser General Public
 15   License along with the GNU C Library.  If not, see
 16   <https://www.gnu.org/licenses/>.  */
 17
 18#ifndef _FENV_H
 19# error "Never use <bits/fenv.h> directly; include <fenv.h> instead."
 20#endif
 21
 22
 23#if defined __HAVE_68881__ || defined __HAVE_FPU__ || defined __mcffpu__
 24
 25/* Define bits representing the exception.  We use the bit positions of
 26   the appropriate bits in the FPSR Accrued Exception Byte.  */
 27enum
 28  {
 29    FE_INEXACT =
 30# define FE_INEXACT	(1 << 3)
 31      FE_INEXACT,
 32    FE_DIVBYZERO =
 33# define FE_DIVBYZERO	(1 << 4)
 34      FE_DIVBYZERO,
 35    FE_UNDERFLOW =
 36# define FE_UNDERFLOW	(1 << 5)
 37      FE_UNDERFLOW,
 38    FE_OVERFLOW =
 39# define FE_OVERFLOW	(1 << 6)
 40      FE_OVERFLOW,
 41    FE_INVALID =
 42# define FE_INVALID	(1 << 7)
 43      FE_INVALID
 44  };
 45
 46# define FE_ALL_EXCEPT \
 47	(FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
 48
 49/* The m68k FPU supports all of the four defined rounding modes.  We use
 50   the bit positions in the FPCR Mode Control Byte as the values for the
 51   appropriate macros.  */
 52enum
 53  {
 54    FE_TONEAREST =
 55# define FE_TONEAREST	0
 56      FE_TONEAREST,
 57    FE_TOWARDZERO =
 58# define FE_TOWARDZERO	(1 << 4)
 59      FE_TOWARDZERO,
 60    FE_DOWNWARD =
 61# define FE_DOWNWARD	(2 << 4)
 62      FE_DOWNWARD,
 63    FE_UPWARD =
 64# define FE_UPWARD	(3 << 4)
 65      FE_UPWARD
 66  };
 67
 68#else
 69
 70/* In the soft-float case, only rounding to nearest is supported, with
 71   no exceptions.  */
 72
 73# define FE_ALL_EXCEPT 0
 74
 75enum
 76  {
 77    __FE_UNDEFINED = -1,
 78
 79    FE_TONEAREST =
 80# define FE_TONEAREST	0
 81      FE_TONEAREST
 82  };
 83
 84#endif
 85
 86
 87/* Type representing exception flags.  */
 88typedef unsigned int fexcept_t;
 89
 90
 91#if defined __HAVE_68881__ || defined __HAVE_FPU__ || defined __mcffpu__
 92
 93/* Type representing floating-point environment.  This structure
 94   corresponds to the layout of the block written by `fmovem'.  */
 95typedef struct
 96  {
 97    unsigned int __control_register;
 98    unsigned int __status_register;
 99    unsigned int __instruction_address;
100  }
101fenv_t;
102
103#else
104
105/* Keep ABI compatibility with the type used in the generic
106   bits/fenv.h, formerly used for no-FPU ColdFire.  */
107typedef struct
108  {
109    fexcept_t __excepts;
110  }
111fenv_t;
112
113#endif
114
115/* If the default argument is used we use this value.  */
116#define FE_DFL_ENV	((const fenv_t *) -1)
117
118#if defined __USE_GNU && (defined __HAVE_68881__	\
119			  || defined __HAVE_FPU__	\
120			  || defined __mcffpu__)
121/* Floating-point environment where none of the exceptions are masked.  */
122# define FE_NOMASK_ENV	((const fenv_t *) -2)
123#endif
124
125#if __GLIBC_USE (IEC_60559_BFP_EXT_C23)
126/* Type representing floating-point control modes.  */
127typedef unsigned int femode_t;
128
129/* Default floating-point control modes.  */
130# define FE_DFL_MODE	((const femode_t *) -1L)
131#endif