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| 1 | /* Copyright (C) 1997-2024 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. */ |
| 27 | enum |
| 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. */ |
| 52 | enum |
| 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 | |
| 75 | enum |
| 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. */ |
| 88 | typedef 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'. */ |
| 95 | typedef struct |
| 96 | { |
| 97 | unsigned int __control_register; |
| 98 | unsigned int __status_register; |
| 99 | unsigned int __instruction_address; |
| 100 | } |
| 101 | fenv_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. */ |
| 107 | typedef struct |
| 108 | { |
| 109 | fexcept_t __excepts; |
| 110 | } |
| 111 | fenv_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_C2X) |
| 126 | /* Type representing floating-point control modes. */ |
| 127 | typedef unsigned int femode_t; |
| 128 | |
| 129 | /* Default floating-point control modes. */ |
| 130 | # define FE_DFL_MODE ((const femode_t *) -1L) |
| 131 | #endif |
| 132 |
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