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 __declare_fenv_inline(int)
feclearexcept(int excepts)55 feclearexcept(int excepts)
56 {
57 (void) excepts;
58 return (0);
59 }
60
61 __declare_fenv_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 __declare_fenv_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 __declare_fenv_inline(int)
feraiseexcept(int excepts)79 feraiseexcept(int excepts)
80 {
81 return( excepts != 0 );
82 }
83
84 __declare_fenv_inline(int)
fesetexcept(int excepts)85 fesetexcept(int excepts)
86 {
87 return( excepts != 0 );
88 }
89
90 __declare_fenv_inline(int)
fetestexcept(int excepts)91 fetestexcept(int excepts)
92 {
93 (void) excepts;
94 return (0);
95 }
96
97 __declare_fenv_inline(int)
fegetround(void)98 fegetround(void)
99 {
100 return FE_TONEAREST;
101 }
102
103 __declare_fenv_inline(int)
fesetround(int rounding_mode)104 fesetround(int rounding_mode)
105 {
106 if (rounding_mode == FE_TONEAREST)
107 return 0;
108 return 1;
109 }
110
111 __declare_fenv_inline(int)
fegetenv(fenv_t * envp)112 fegetenv(fenv_t *envp)
113 {
114 (void) envp;
115 return (0);
116 }
117
118 __declare_fenv_inline(int)
feholdexcept(fenv_t * envp)119 feholdexcept(fenv_t *envp)
120 {
121 (void) envp;
122 return (0);
123 }
124
125 __declare_fenv_inline(int)
fesetenv(const fenv_t * envp)126 fesetenv(const fenv_t *envp)
127 {
128 (void) envp;
129 return (0);
130 }
131
132 __declare_fenv_inline(int)
feupdateenv(const fenv_t * envp)133 feupdateenv(const fenv_t *envp)
134 {
135 (void) envp;
136
137 #if defined FE_NOMASK_ENV && FE_ALL_EXCEPT != 0
138 if (envp == FE_NOMASK_ENV)
139 return 1;
140 #endif
141
142 return (0);
143 }
144
145 #if __BSD_VISIBLE
146
147 __declare_fenv_inline(int)
feenableexcept(int __mask)148 feenableexcept(int __mask)
149 {
150 (void) __mask;
151 return (0);
152 }
153
154 __declare_fenv_inline(int)
fedisableexcept(int __mask)155 fedisableexcept(int __mask)
156 {
157 (void) __mask;
158 return (0);
159 }
160
161 __declare_fenv_inline(int)
fegetexcept(void)162 fegetexcept(void)
163 {
164
165 return (0);
166 }
167
168 #endif /* __BSD_VISIBLE */
169
