fenv.h revision 1.1 1 /* $NetBSD: fenv.h,v 1.1 2015/12/21 17:02:33 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2004-2005 David Schultz <das (at) 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/stdint.h>
35
36 #ifndef __fenv_static
37 #define __fenv_static static
38 #endif
39
40 typedef uint32_t fenv_t;
41 typedef uint32_t fexcept_t;
42
43 /* Exception flags */
44 #define FE_INVALID 0x0001
45 #define FE_DIVBYZERO 0x0002
46 #define FE_OVERFLOW 0x0004
47 #define FE_UNDERFLOW 0x0008
48 #define FE_INEXACT 0x0010
49 #define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | \
50 FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
51
52 /* Rounding modes */
53 #define FE_TONEAREST 0x0000
54 #define FE_TOWARDZERO 0x0001
55 #define FE_UPWARD 0x0002
56 #define FE_DOWNWARD 0x0003
57 #define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \
58 FE_UPWARD | FE_TOWARDZERO)
59 __BEGIN_DECLS
60
61 /* Default floating-point environment */
62 extern const fenv_t __fe_dfl_env;
63 #define FE_DFL_ENV (&__fe_dfl_env)
64
65 /* We need to be able to map status flag positions to mask flag positions */
66 #define _FPUSW_SHIFT 16
67 #define _ENABLE_MASK (FE_ALL_EXCEPT << _FPUSW_SHIFT)
68
69 #ifdef ARM_HARD_FLOAT
70 #define __rfs(__fpsr) __asm __volatile("rfs %0" : "=r" (*(__fpsr)))
71 #define __wfs(__fpsr) __asm __volatile("wfs %0" : : "r" (__fpsr))
72 #else
73 #define __rfs(__fpsr)
74 #define __wfs(__fpsr)
75 #endif
76
77 __fenv_static inline int
78 feclearexcept(int __excepts)
79 {
80 fexcept_t __fpsr;
81
82 __rfs(&__fpsr);
83 __fpsr &= ~__excepts;
84 __wfs(__fpsr);
85 return (0);
86 }
87
88 __fenv_static inline int
89 fegetexceptflag(fexcept_t *__flagp, int __excepts)
90 {
91 fexcept_t __fpsr;
92
93 __rfs(&__fpsr);
94 *__flagp = __fpsr & __excepts;
95 return (0);
96 }
97
98 __fenv_static inline int
99 fesetexceptflag(const fexcept_t *__flagp, int __excepts)
100 {
101 fexcept_t __fpsr;
102
103 __rfs(&__fpsr);
104 __fpsr &= ~__excepts;
105 __fpsr |= *__flagp & __excepts;
106 __wfs(__fpsr);
107 return (0);
108 }
109
110 __fenv_static inline int
111 feraiseexcept(int __excepts)
112 {
113 fexcept_t __ex = __excepts;
114
115 fesetexceptflag(&__ex, __excepts); /* XXX */
116 return (0);
117 }
118
119 __fenv_static inline int
120 fetestexcept(int __excepts)
121 {
122 fexcept_t __fpsr;
123
124 __rfs(&__fpsr);
125 return (__fpsr & __excepts);
126 }
127
128 __fenv_static inline int
129 fegetround(void)
130 {
131
132 /*
133 * Apparently, the rounding mode is specified as part of the
134 * instruction format on ARM, so the dynamic rounding mode is
135 * indeterminate. Some FPUs may differ.
136 */
137 return (-1);
138 }
139
140 __fenv_static inline int
141 fesetround(int __round)
142 {
143
144 return (-1);
145 }
146
147 __fenv_static inline int
148 fegetenv(fenv_t *__envp)
149 {
150
151 __rfs(__envp);
152 return (0);
153 }
154
155 __fenv_static inline int
156 feholdexcept(fenv_t *__envp)
157 {
158 fenv_t __env;
159
160 __rfs(&__env);
161 *__envp = __env;
162 __env &= ~(FE_ALL_EXCEPT | _ENABLE_MASK);
163 __wfs(__env);
164 return (0);
165 }
166
167 __fenv_static inline int
168 fesetenv(const fenv_t *__envp)
169 {
170
171 __wfs(*__envp);
172 return (0);
173 }
174
175 __fenv_static inline int
176 feupdateenv(const fenv_t *__envp)
177 {
178 fexcept_t __fpsr;
179
180 __rfs(&__fpsr);
181 __wfs(*__envp);
182 feraiseexcept(__fpsr & FE_ALL_EXCEPT);
183 return (0);
184 }
185
186 #if defined(_NETBSD_SOURCE) || defined(_GNU_SOURCE)
187
188 /* We currently provide no external definitions of the functions below. */
189
190 static inline int
191 feenableexcept(int __mask)
192 {
193 fenv_t __old_fpsr, __new_fpsr;
194
195 __rfs(&__old_fpsr);
196 __new_fpsr = __old_fpsr | (__mask & FE_ALL_EXCEPT) << _FPUSW_SHIFT;
197 __wfs(__new_fpsr);
198 return ((__old_fpsr >> _FPUSW_SHIFT) & FE_ALL_EXCEPT);
199 }
200
201 static inline int
202 fedisableexcept(int __mask)
203 {
204 fenv_t __old_fpsr, __new_fpsr;
205
206 __rfs(&__old_fpsr);
207 __new_fpsr = __old_fpsr & ~((__mask & FE_ALL_EXCEPT) << _FPUSW_SHIFT);
208 __wfs(__new_fpsr);
209 return ((__old_fpsr >> _FPUSW_SHIFT) & FE_ALL_EXCEPT);
210 }
211
212 static inline int
213 fegetexcept(void)
214 {
215 fenv_t __fpsr;
216
217 __rfs(&__fpsr);
218 return ((__fpsr & _ENABLE_MASK) >> _FPUSW_SHIFT);
219 }
220
221 #endif /* _NETBSD_SOURCE || _GNU_SOURCE */
222
223 __END_DECLS
224
225 #endif /* !_FENV_H_ */
226