| 1 | /*	$NetBSD: fenv.h,v 1.7 2024/10/30 15:56:11 riastradh Exp $	*/ |
| 2 | |
| 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 | * $FreeBSD: head/lib/msun/mips/fenv.h 226218 2011-10-10 15:43:09Z das $ |
| 29 | */ |
| 30 | |
| 31 | #ifndef	_MIPS_FENV_H_ |
| 32 | #define	_MIPS_FENV_H_ |
| 33 | |
| 34 | #include <sys/featuretest.h> |
| 35 | #include <sys/stdint.h> |
| 36 | |
| 37 | /* Exception flags */ |
| 38 | #define	FE_INEXACT	0x0004 |
| 39 | #define	FE_UNDERFLOW	0x0008 |
| 40 | #define	FE_OVERFLOW	0x0010 |
| 41 | #define	FE_DIVBYZERO	0x0020 |
| 42 | #define	FE_INVALID	0x0040 |
| 43 | #define	FE_ALL_EXCEPT	(FE_DIVBYZERO | FE_INEXACT | \ |
| 44 | 			 FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW) |
| 45 | |
| 46 | /* Rounding modes */ |
| 47 | #define	FE_TONEAREST	0x0000 |
| 48 | #define	FE_TOWARDZERO	0x0001 |
| 49 | #define	FE_UPWARD	0x0002 |
| 50 | #define	FE_DOWNWARD	0x0003 |
| 51 | #define	_ROUND_MASK	(FE_TONEAREST | FE_DOWNWARD | \ |
| 52 | 			 FE_UPWARD | FE_TOWARDZERO) |
| 53 | |
| 54 | #ifndef __mips_soft_float |
| 55 | |
| 56 | #ifndef	__fenv_static |
| 57 | #define	__fenv_static	static |
| 58 | #endif |
| 59 | |
| 60 | typedef	uint32_t 	fpu_control_t __attribute__((__mode__(__SI__))); |
| 61 | typedef	fpu_control_t	fenv_t; |
| 62 | typedef	fpu_control_t	fexcept_t; |
| 63 | |
| 64 | __BEGIN_DECLS |
| 65 | |
| 66 | /* Default floating-point environment */ |
| 67 | extern const fenv_t	__fe_dfl_env; |
| 68 | #define	FE_DFL_ENV	(&__fe_dfl_env) |
| 69 | |
| 70 | /* We need to be able to map status flag positions to mask flag positions */ |
| 71 | #define	_ENABLE_MASK	(FE_ALL_EXCEPT << _ENABLE_SHIFT) |
| 72 | #define	_ENABLE_SHIFT 5 |
| 73 | |
| 74 | static inline fpu_control_t |
| 75 | __rfs(void) |
| 76 | { |
| 77 | 	fpu_control_t __fpsr; |
| 78 | |
| 79 | 	__asm __volatile("cfc1 %0,$31" : "=r" (__fpsr)); |
| 80 | 	return __fpsr; |
| 81 | } |
| 82 | |
| 83 | static inline void |
| 84 | __wfs(fpu_control_t __fpsr) |
| 85 | { |
| 86 | |
| 87 | 	__asm __volatile("ctc1 %0,$31" : : "r" (__fpsr)); |
| 88 | } |
| 89 | |
| 90 | #if __GNUC_PREREQ__(8, 0) |
| 91 | #pragma GCC diagnostic push |
| 92 | #pragma GCC diagnostic ignored "-Wshadow" |
| 93 | #endif |
| 94 | |
| 95 | __fenv_static inline int |
| 96 | feclearexcept(int __excepts) |
| 97 | { |
| 98 | 	fexcept_t __fpsr; |
| 99 | |
| 100 | 	__excepts &= FE_ALL_EXCEPT; |
| 101 | 	__fpsr = __rfs(); |
| 102 | 	__fpsr &= ~(__excepts | (__excepts << _ENABLE_SHIFT)); |
| 103 | 	__wfs(__fpsr); |
| 104 | 	return 0; |
| 105 | } |
| 106 | |
| 107 | __fenv_static inline int |
| 108 | fegetexceptflag(fexcept_t *__flagp, int __excepts) |
| 109 | { |
| 110 | 	fexcept_t __fpsr; |
| 111 | |
| 112 | 	__fpsr = __rfs(); |
| 113 | 	*__flagp = __fpsr & __excepts; |
| 114 | 	return (0); |
| 115 | } |
| 116 | |
| 117 | __fenv_static inline int |
| 118 | fesetexceptflag(const fexcept_t *__flagp, int __excepts) |
| 119 | { |
| 120 | 	fexcept_t __fpsr; |
| 121 | |
| 122 | 	__fpsr = __rfs(); |
| 123 | 	__fpsr &= ~__excepts; |
| 124 | 	__fpsr |= *__flagp & __excepts; |
| 125 | 	__wfs(__fpsr); |
| 126 | 	return (0); |
| 127 | } |
| 128 | |
| 129 | __fenv_static inline int |
| 130 | feraiseexcept(int __excepts) |
| 131 | { |
| 132 | 	fexcept_t __ex = __excepts; |
| 133 | |
| 134 | 	fesetexceptflag(&__ex, __excepts);	/* XXX */ |
| 135 | 	return (0); |
| 136 | } |
| 137 | |
| 138 | __fenv_static inline int |
| 139 | fetestexcept(int __excepts) |
| 140 | { |
| 141 | 	fexcept_t __fpsr; |
| 142 | |
| 143 | 	__fpsr = __rfs(); |
| 144 | 	return (__fpsr & __excepts); |
| 145 | } |
| 146 | |
| 147 | __fenv_static inline int |
| 148 | fegetround(void) |
| 149 | { |
| 150 | 	fexcept_t __fpsr; |
| 151 | |
| 152 | 	__fpsr = __rfs(); |
| 153 | 	return __fpsr & _ROUND_MASK; |
| 154 | } |
| 155 | |
| 156 | __fenv_static inline int |
| 157 | fesetround(int __round) |
| 158 | { |
| 159 | 	fexcept_t __fpsr; |
| 160 | |
| 161 | 	if (__round & ~_ROUND_MASK) |
| 162 | 		return 1; |
| 163 | 	__fpsr = __rfs(); |
| 164 | 	__fpsr &= ~_ROUND_MASK; |
| 165 | 	__fpsr |= __round; |
| 166 | 	__wfs(__fpsr); |
| 167 | |
| 168 | 	return 0; |
| 169 | } |
| 170 | |
| 171 | __fenv_static inline int |
| 172 | fegetenv(fenv_t *__envp) |
| 173 | { |
| 174 | |
| 175 | 	*__envp = __rfs(); |
| 176 | 	return (0); |
| 177 | } |
| 178 | |
| 179 | __fenv_static inline int |
| 180 | feholdexcept(fenv_t *__envp) |
| 181 | { |
| 182 | 	fenv_t __env; |
| 183 | |
| 184 | 	__env = __rfs(); |
| 185 | 	*__envp = __env; |
| 186 | 	__env &= ~(FE_ALL_EXCEPT | _ENABLE_MASK); |
| 187 | 	__wfs(__env); |
| 188 | 	return (0); |
| 189 | } |
| 190 | |
| 191 | __fenv_static inline int |
| 192 | fesetenv(const fenv_t *__envp) |
| 193 | { |
| 194 | |
| 195 | 	__wfs(*__envp); |
| 196 | 	return (0); |
| 197 | } |
| 198 | |
| 199 | __fenv_static inline int |
| 200 | feupdateenv(const fenv_t *__envp) |
| 201 | { |
| 202 | 	fexcept_t __fpsr; |
| 203 | |
| 204 | 	__fpsr = __rfs(); |
| 205 | 	__wfs(*__envp); |
| 206 | 	feraiseexcept(__fpsr & FE_ALL_EXCEPT); |
| 207 | 	return (0); |
| 208 | } |
| 209 | |
| 210 | #if __GNUC_PREREQ__(8, 0) |
| 211 | #pragma GCC diagnostic pop |
| 212 | #endif |
| 213 | |
| 214 | #if defined(_NETBSD_SOURCE) || defined(_GNU_SOURCE) |
| 215 | |
| 216 | __fenv_static inline int |
| 217 | feenableexcept(int __excepts) |
| 218 | { |
| 219 | 	fenv_t __old_fpsr, __new_fpsr; |
| 220 | |
| 221 | 	__new_fpsr = __rfs(); |
| 222 | 	__old_fpsr = (__new_fpsr & _ENABLE_MASK) >> _ENABLE_SHIFT; |
| 223 | 	__excepts &= FE_ALL_EXCEPT; |
| 224 | 	__new_fpsr |= __excepts << _ENABLE_SHIFT; |
| 225 | 	__wfs(__new_fpsr); |
| 226 | 	return __old_fpsr; |
| 227 | } |
| 228 | |
| 229 | __fenv_static inline int |
| 230 | fedisableexcept(int __excepts) |
| 231 | { |
| 232 | 	fenv_t __old_fpsr, __new_fpsr; |
| 233 | |
| 234 | 	__new_fpsr = __rfs(); |
| 235 | 	__old_fpsr = (__new_fpsr & _ENABLE_MASK) >> _ENABLE_SHIFT; |
| 236 | 	__excepts &= FE_ALL_EXCEPT; |
| 237 | 	__new_fpsr &= ~(__excepts << _ENABLE_SHIFT); |
| 238 | 	__wfs(__new_fpsr); |
| 239 | 	return __old_fpsr; |
| 240 | } |
| 241 | |
| 242 | __fenv_static inline int |
| 243 | fegetexcept(void) |
| 244 | { |
| 245 | 	fenv_t __fpsr; |
| 246 | |
| 247 | 	__fpsr = __rfs(); |
| 248 | 	return ((__fpsr & _ENABLE_MASK) >> _ENABLE_SHIFT); |
| 249 | } |
| 250 | |
| 251 | #endif /* _NETBSD_SOURCE || _GNU_SOURCE */ |
| 252 | |
| 253 | __END_DECLS |
| 254 | |
| 255 | #endif /* __mips_soft_float */ |
| 256 | |
| 257 | #endif	/* !_FENV_H_ */ |