1 /*- 2 * Copyright (c) 2004-2005 David Schultz <das (at) FreeBSD.ORG> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: src/lib/msun/mips/fenv.h,v 1.1 2008/04/26 12:20:29 imp Exp $ 27 */ 28 29 #ifndef _FENV_H_ 30 #define _FENV_H_ 31 32 #include <sys/cdefs.h> 33 #include <sys/_types.h> 34 35 __BEGIN_DECLS 36 37 typedef __uint32_t fenv_t; 38 typedef __uint32_t fexcept_t; 39 40 /* Exception flags */ 41 #define FE_INVALID 0x0001 42 #define FE_DIVBYZERO 0x0002 43 #define FE_OVERFLOW 0x0004 44 #define FE_UNDERFLOW 0x0008 45 #define FE_INEXACT 0x0010 46 #define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | \ 47 FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW) 48 49 /* Rounding modes */ 50 #define FE_TONEAREST 0x0000 51 #define FE_TOWARDZERO 0x0001 52 #define FE_UPWARD 0x0002 53 #define FE_DOWNWARD 0x0003 54 #define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \ 55 FE_UPWARD | FE_TOWARDZERO) 56 57 /* Default floating-point environment */ 58 extern const fenv_t __fe_dfl_env; 59 #define FE_DFL_ENV (&__fe_dfl_env) 60 61 /* We need to be able to map status flag positions to mask flag positions */ 62 #define _FPUSW_SHIFT 16 63 #define _ENABLE_MASK (FE_ALL_EXCEPT << _FPUSW_SHIFT) 64 65 #ifdef ARM_HARD_FLOAT 66 #define __rfs(__fpsr) __asm __volatile("rfs %0" : "=r" (*(__fpsr))) 67 #define __wfs(__fpsr) __asm __volatile("wfs %0" : : "r" (__fpsr)) 68 #else 69 #define __rfs(__fpsr) 70 #define __wfs(__fpsr) 71 #endif 72 73 static __inline int 74 feclearexcept(int __excepts) 75 { 76 fexcept_t __fpsr; 77 78 __rfs(&__fpsr); 79 __fpsr &= ~__excepts; 80 __wfs(__fpsr); 81 return (0); 82 } 83 84 static __inline int 85 fegetexceptflag(fexcept_t *__flagp, int __excepts) 86 { 87 fexcept_t __fpsr; 88 89 __rfs(&__fpsr); 90 *__flagp = __fpsr & __excepts; 91 return (0); 92 } 93 94 static __inline int 95 fesetexceptflag(const fexcept_t *__flagp, int __excepts) 96 { 97 fexcept_t __fpsr; 98 99 __rfs(&__fpsr); 100 __fpsr &= ~__excepts; 101 __fpsr |= *__flagp & __excepts; 102 __wfs(__fpsr); 103 return (0); 104 } 105 106 static __inline int 107 feraiseexcept(int __excepts) 108 { 109 fexcept_t __ex = __excepts; 110 111 fesetexceptflag(&__ex, __excepts); /* XXX */ 112 return (0); 113 } 114 115 static __inline int 116 fetestexcept(int __excepts) 117 { 118 fexcept_t __fpsr; 119 120 __rfs(&__fpsr); 121 return (__fpsr & __excepts); 122 } 123 124 static __inline int 125 fegetround(void) 126 { 127 128 /* 129 * Apparently, the rounding mode is specified as part of the 130 * instruction format on ARM, so the dynamic rounding mode is 131 * indeterminate. Some FPUs may differ. 132 */ 133 return (-1); 134 } 135 136 static __inline int 137 fesetround(int __round) 138 { 139 140 return (-1); 141 } 142 143 static __inline int 144 fegetenv(fenv_t *__envp) 145 { 146 147 __rfs(__envp); 148 return (0); 149 } 150 151 static __inline int 152 feholdexcept(fenv_t *__envp) 153 { 154 fenv_t __env; 155 156 __rfs(&__env); 157 *__envp = __env; 158 __env &= ~(FE_ALL_EXCEPT | _ENABLE_MASK); 159 __wfs(__env); 160 return (0); 161 } 162 163 static __inline int 164 fesetenv(const fenv_t *__envp) 165 { 166 167 __wfs(*__envp); 168 return (0); 169 } 170 171 static __inline int 172 feupdateenv(const fenv_t *__envp) 173 { 174 fexcept_t __fpsr; 175 176 __rfs(&__fpsr); 177 __wfs(*__envp); 178 feraiseexcept(__fpsr & FE_ALL_EXCEPT); 179 return (0); 180 } 181 182 #if __BSD_VISIBLE 183 184 static __inline int 185 feenableexcept(int __mask) 186 { 187 fenv_t __old_fpsr, __new_fpsr; 188 189 __rfs(&__old_fpsr); 190 __new_fpsr = __old_fpsr | (__mask & FE_ALL_EXCEPT) << _FPUSW_SHIFT; 191 __wfs(__new_fpsr); 192 return ((__old_fpsr >> _FPUSW_SHIFT) & FE_ALL_EXCEPT); 193 } 194 195 static __inline int 196 fedisableexcept(int __mask) 197 { 198 fenv_t __old_fpsr, __new_fpsr; 199 200 __rfs(&__old_fpsr); 201 __new_fpsr = __old_fpsr & ~((__mask & FE_ALL_EXCEPT) << _FPUSW_SHIFT); 202 __wfs(__new_fpsr); 203 return ((__old_fpsr >> _FPUSW_SHIFT) & FE_ALL_EXCEPT); 204 } 205 206 static __inline int 207 fegetexcept(void) 208 { 209 fenv_t __fpsr; 210 211 __rfs(&__fpsr); 212 return ((__fpsr & _ENABLE_MASK) >> _FPUSW_SHIFT); 213 } 214 215 #endif /* __BSD_VISIBLE */ 216 217 __END_DECLS 218 219 #endif /* !_FENV_H_ */ 220 221
