1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2004-2011 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 * $FreeBSD$
29 */
30
31 /*
32 * This file implements the functionality of <fenv.h> on platforms that
33 * lack an FPU and use softfloat in libc for floating point. To use it,
34 * you must write an <fenv.h> that provides the following:
35 *
36 * - a typedef for fenv_t, which may be an integer or struct type
37 * - a typedef for fexcept_t (XXX This file assumes fexcept_t is a
38 * simple integer type containing the exception mask.)
39 * - definitions of FE_* constants for the five exceptions and four
40 * rounding modes in IEEE 754, as described in fenv(3)
41 * - a definition, and the corresponding external symbol, for FE_DFL_ENV
42 * - a macro __set_env(env, flags, mask, rnd), which sets the given fenv_t
43 * from the exception flags, mask, and rounding mode
44 * - macros __env_flags(env), __env_mask(env), and __env_round(env), which
45 * extract fields from an fenv_t
46 * - a definition of __fenv_static
47 *
48 * If the architecture supports an optional FPU, it's recommended that you
49 * define fenv_t and fexcept_t to match the hardware ABI. Otherwise, it
50 * doesn't matter how you define them.
51 */
52 #include <errno.h>
53
54 __fenv_static inline int
feclearexcept(int excepts)55 feclearexcept(int excepts)
56 {
57 (void) excepts;
58 return (0);
59 }
60
61 __fenv_static inline int
fegetexceptflag(fexcept_t * flagp,int excepts)62 fegetexceptflag(fexcept_t *flagp, int excepts)
63 {
64 (void) excepts;
65 (void) flagp;
66 return (0);
67
68 }
69
70 __fenv_static inline int
fesetexceptflag(const fexcept_t * flagp,int excepts)71 fesetexceptflag(const fexcept_t *flagp, int excepts)
72 {
73 (void) excepts;
74 (void) flagp;
75 return (0);
76 }
77
78 __fenv_static inline int
feraiseexcept(int excepts)79 feraiseexcept(int excepts)
80 {
81
82 return( excepts != 0 );
83
84 }
85
86 __fenv_static inline int
fetestexcept(int excepts)87 fetestexcept(int excepts)
88 {
89 (void) excepts;
90 return (0);
91 }
92
93 __fenv_static inline int
fegetround(void)94 fegetround(void)
95 {
96
97 #ifdef FE_TONEAREST
98 return FE_TONEAREST;
99 #else
100 return 0;
101 #endif
102
103 }
104
105 __fenv_static inline int
fesetround(int rounding_mode)106 fesetround(int rounding_mode)
107 {
108 (void) rounding_mode;
109
110 return (0);
111 }
112
113 __fenv_static inline int
fegetenv(fenv_t * envp)114 fegetenv(fenv_t *envp)
115 {
116 (void) envp;
117 return (0);
118 }
119
120 __fenv_static inline int
feholdexcept(fenv_t * envp)121 feholdexcept(fenv_t *envp)
122 {
123 (void) envp;
124 return (0);
125 }
126
127 __fenv_static inline int
fesetenv(const fenv_t * envp)128 fesetenv(const fenv_t *envp)
129 {
130 (void) envp;
131 return (0);
132 }
133
134 __fenv_static inline int
feupdateenv(const fenv_t * envp)135 feupdateenv(const fenv_t *envp)
136 {
137 (void) envp;
138
139 #if defined FE_NOMASK_ENV && FE_ALL_EXCEPT != 0
140 if (envp == FE_NOMASK_ENV)
141 return 1;
142 #endif
143
144 return (0);
145 }
146
147 #if __BSD_VISIBLE
148
149 /* We currently provide no external definitions of the functions below. */
150
151 __fenv_static inline int
feenableexcept(int __mask)152 feenableexcept(int __mask)
153 {
154 (void) __mask;
155 return (0);
156 }
157
158 __fenv_static inline int
fedisableexcept(int __mask)159 fedisableexcept(int __mask)
160 {
161 (void) __mask;
162 return (0);
163 }
164
165 __fenv_static inline int
fegetexcept(void)166 fegetexcept(void)
167 {
168
169 return (0);
170 }
171
172 #endif /* __BSD_VISIBLE */
173
