fenv.h (6136B) - Raw
1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #ifndef _FENV_H_ 30 #define _FENV_H_ 31 32 #include <sys/_types.h> 33 34 #ifndef __fenv_static 35 #define __fenv_static static 36 #endif 37 38 typedef __uint32_t fenv_t; 39 typedef __uint32_t fexcept_t; 40 41 /* Exception flags */ 42 #define FE_INVALID 0x0001 43 #define FE_DIVBYZERO 0x0002 44 #define FE_OVERFLOW 0x0004 45 #define FE_UNDERFLOW 0x0008 46 #define FE_INEXACT 0x0010 47 #ifdef __ARM_PCS_VFP 48 #define FE_DENORMAL 0x0080 49 #define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | \ 50 FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW | FE_DENORMAL) 51 #else 52 #define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | \ 53 FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW) 54 #endif 55 56 /* Rounding modes */ 57 #define VFP_FE_TONEAREST 0x00000000 58 #define VFP_FE_UPWARD 0x00400000 59 #define VFP_FE_DOWNWARD 0x00800000 60 #define VFP_FE_TOWARDZERO 0x00c00000 61 62 #ifdef __ARM_PCS_VFP 63 #define FE_TONEAREST VFP_FE_TONEAREST 64 #define FE_UPWARD VFP_FE_UPWARD 65 #define FE_DOWNWARD VFP_FE_DOWNWARD 66 #define FE_TOWARDZERO VFP_FE_TOWARDZERO 67 #else 68 #define FE_TONEAREST 0x0000 69 #define FE_TOWARDZERO 0x0001 70 #define FE_UPWARD 0x0002 71 #define FE_DOWNWARD 0x0003 72 #endif 73 #define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \ 74 FE_UPWARD | FE_TOWARDZERO) 75 __BEGIN_DECLS 76 77 /* Default floating-point environment */ 78 extern const fenv_t __fe_dfl_env; 79 #define FE_DFL_ENV (&__fe_dfl_env) 80 81 /* We need to be able to map status flag positions to mask flag positions */ 82 #ifndef __ARM_PCS_VFP 83 #define _FPUSW_SHIFT 16 84 #define _ENABLE_MASK (FE_ALL_EXCEPT << _FPUSW_SHIFT) 85 #endif 86 87 #ifndef __ARM_PCS_VFP 88 89 int feclearexcept(int __excepts); 90 int fegetexceptflag(fexcept_t *__flagp, int __excepts); 91 int fesetexceptflag(const fexcept_t *__flagp, int __excepts); 92 int feraiseexcept(int __excepts); 93 int fetestexcept(int __excepts); 94 int fegetround(void); 95 int fesetround(int __round); 96 int fegetenv(fenv_t *__envp); 97 int feholdexcept(fenv_t *__envp); 98 int fesetenv(const fenv_t *__envp); 99 int feupdateenv(const fenv_t *__envp); 100 #if __BSD_VISIBLE 101 int feenableexcept(int __mask); 102 int fedisableexcept(int __mask); 103 int fegetexcept(void); 104 #endif 105 106 #else /* __ARM_PCS_VFP */ 107 108 #define vmrs_fpscr(__r) __asm __volatile("vmrs %0, fpscr" : "=&r"(__r)) 109 #define vmsr_fpscr(__r) __asm __volatile("vmsr fpscr, %0" : : "r"(__r)) 110 111 #define _FPU_MASK_SHIFT 8 112 113 __fenv_static inline int 114 feclearexcept(int __excepts) 115 { 116 fexcept_t __fpsr; 117 118 vmrs_fpscr(__fpsr); 119 __fpsr &= ~__excepts; 120 vmsr_fpscr(__fpsr); 121 return (0); 122 } 123 124 __fenv_static inline int 125 fegetexceptflag(fexcept_t *__flagp, int __excepts) 126 { 127 fexcept_t __fpsr; 128 129 vmrs_fpscr(__fpsr); 130 *__flagp = __fpsr & __excepts; 131 return (0); 132 } 133 134 __fenv_static inline int 135 fesetexceptflag(const fexcept_t *__flagp, int __excepts) 136 { 137 fexcept_t __fpsr; 138 139 vmrs_fpscr(__fpsr); 140 __fpsr &= ~__excepts; 141 __fpsr |= *__flagp & __excepts; 142 vmsr_fpscr(__fpsr); 143 return (0); 144 } 145 146 __fenv_static inline int 147 feraiseexcept(int __excepts) 148 { 149 fexcept_t __ex = __excepts; 150 151 fesetexceptflag(&__ex, __excepts); /* XXX */ 152 return (0); 153 } 154 155 __fenv_static inline int 156 fetestexcept(int __excepts) 157 { 158 fexcept_t __fpsr; 159 160 vmrs_fpscr(__fpsr); 161 return (__fpsr & __excepts); 162 } 163 164 __fenv_static inline int 165 fegetround(void) 166 { 167 fenv_t __fpsr; 168 169 vmrs_fpscr(__fpsr); 170 return (__fpsr & _ROUND_MASK); 171 } 172 173 __fenv_static inline int 174 fesetround(int __round) 175 { 176 fenv_t __fpsr; 177 178 vmrs_fpscr(__fpsr); 179 __fpsr &= ~(_ROUND_MASK); 180 __fpsr |= __round; 181 vmsr_fpscr(__fpsr); 182 return (0); 183 } 184 185 __fenv_static inline int 186 fegetenv(fenv_t *__envp) 187 { 188 189 vmrs_fpscr(*__envp); 190 return (0); 191 } 192 193 __fenv_static inline int 194 feholdexcept(fenv_t *__envp) 195 { 196 fenv_t __env; 197 198 vmrs_fpscr(__env); 199 *__envp = __env; 200 __env &= ~(FE_ALL_EXCEPT); 201 vmsr_fpscr(__env); 202 return (0); 203 } 204 205 __fenv_static inline int 206 fesetenv(const fenv_t *__envp) 207 { 208 209 vmsr_fpscr(*__envp); 210 return (0); 211 } 212 213 __fenv_static inline int 214 feupdateenv(const fenv_t *__envp) 215 { 216 fexcept_t __fpsr; 217 218 vmrs_fpscr(__fpsr); 219 vmsr_fpscr(*__envp); 220 feraiseexcept(__fpsr & FE_ALL_EXCEPT); 221 return (0); 222 } 223 224 #if __BSD_VISIBLE 225 226 /* We currently provide no external definitions of the functions below. */ 227 228 __fenv_static inline int 229 feenableexcept(int __mask) 230 { 231 fenv_t __old_fpsr, __new_fpsr; 232 233 vmrs_fpscr(__old_fpsr); 234 __new_fpsr = __old_fpsr | 235 ((__mask & FE_ALL_EXCEPT) << _FPU_MASK_SHIFT); 236 vmsr_fpscr(__new_fpsr); 237 return ((__old_fpsr >> _FPU_MASK_SHIFT) & FE_ALL_EXCEPT); 238 } 239 240 __fenv_static inline int 241 fedisableexcept(int __mask) 242 { 243 fenv_t __old_fpsr, __new_fpsr; 244 245 vmrs_fpscr(__old_fpsr); 246 __new_fpsr = __old_fpsr & 247 ~((__mask & FE_ALL_EXCEPT) << _FPU_MASK_SHIFT); 248 vmsr_fpscr(__new_fpsr); 249 return ((__old_fpsr >> _FPU_MASK_SHIFT) & FE_ALL_EXCEPT); 250 } 251 252 __fenv_static inline int 253 fegetexcept(void) 254 { 255 fenv_t __fpsr; 256 257 vmrs_fpscr(__fpsr); 258 return (__fpsr & FE_ALL_EXCEPT); 259 } 260 261 #endif /* __BSD_VISIBLE */ 262 263 #endif /* __ARM_PCS_VFP */ 264 265 __END_DECLS 266 267 #endif /* !_FENV_H_ */