2 * Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG>
3 * Copyright (c) 2015-2016 Ruslan Bukin <br@bsdpad.com>
6 * Portions of this software were developed by SRI International and the
7 * University of Cambridge Computer Laboratory under DARPA/AFRL contract
8 * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
10 * Portions of this software were developed by the University of Cambridge
11 * Computer Laboratory as part of the CTSRD Project, with support from the
12 * UK Higher Education Innovation Fund (HEIF).
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
41 #include <sys/_types.h>
44 #define __fenv_static static
47 typedef __uint64_t fenv_t;
48 typedef __uint64_t fexcept_t;
51 #define FE_INVALID 0x0010
52 #define FE_DIVBYZERO 0x0008
53 #define FE_OVERFLOW 0x0004
54 #define FE_UNDERFLOW 0x0002
55 #define FE_INEXACT 0x0001
56 #define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | \
57 FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
60 * RISC-V Rounding modes
62 #define _ROUND_SHIFT 5
63 #define FE_TONEAREST (0x00 << _ROUND_SHIFT)
64 #define FE_TOWARDZERO (0x01 << _ROUND_SHIFT)
65 #define FE_DOWNWARD (0x02 << _ROUND_SHIFT)
66 #define FE_UPWARD (0x03 << _ROUND_SHIFT)
67 #define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \
68 FE_UPWARD | FE_TOWARDZERO)
72 /* Default floating-point environment */
73 extern const fenv_t __fe_dfl_env;
74 #define FE_DFL_ENV (&__fe_dfl_env)
77 #define __rfs(__fcsr) __asm __volatile("csrr %0, fcsr" : "=r" (__fcsr))
78 #define __wfs(__fcsr) __asm __volatile("csrw fcsr, %0" :: "r" (__fcsr))
82 int feclearexcept(int __excepts);
83 int fegetexceptflag(fexcept_t *__flagp, int __excepts);
84 int fesetexceptflag(const fexcept_t *__flagp, int __excepts);
85 int feraiseexcept(int __excepts);
86 int fetestexcept(int __excepts);
88 int fesetround(int __round);
89 int fegetenv(fenv_t *__envp);
90 int feholdexcept(fenv_t *__envp);
91 int fesetenv(const fenv_t *__envp);
92 int feupdateenv(const fenv_t *__envp);
94 __fenv_static inline int
95 feclearexcept(int __excepts)
98 __asm __volatile("csrc fflags, %0" :: "r"(__excepts));
103 __fenv_static inline int
104 fegetexceptflag(fexcept_t *__flagp, int __excepts)
109 *__flagp = __fcsr & __excepts;
114 __fenv_static inline int
115 fesetexceptflag(const fexcept_t *__flagp, int __excepts)
120 __asm __volatile("csrc fflags, %0" :: "r"(__excepts));
121 __asm __volatile("csrs fflags, %0" :: "r"(__fcsr & __excepts));
126 __fenv_static inline int
127 feraiseexcept(int __excepts)
130 __asm __volatile("csrs fflags, %0" :: "r"(__excepts));
135 __fenv_static inline int
136 fetestexcept(int __excepts)
142 return (__fcsr & __excepts);
145 __fenv_static inline int
152 return (__fcsr & _ROUND_MASK);
155 __fenv_static inline int
156 fesetround(int __round)
160 if (__round & ~_ROUND_MASK)
164 __fcsr &= ~_ROUND_MASK;
171 __fenv_static inline int
172 fegetenv(fenv_t *__envp)
180 __fenv_static inline int
181 feholdexcept(fenv_t *__envp)
184 /* No exception traps. */
189 __fenv_static inline int
190 fesetenv(const fenv_t *__envp)
198 __fenv_static inline int
199 feupdateenv(const fenv_t *__envp)
205 feraiseexcept(__fcsr & FE_ALL_EXCEPT);
209 #endif /* !SOFTFLOAT */
213 /* We currently provide no external definitions of the functions below. */
216 int feenableexcept(int __mask);
217 int fedisableexcept(int __mask);
218 int fegetexcept(void);
221 feenableexcept(int __mask)
224 /* No exception traps. */
230 fedisableexcept(int __mask)
233 /* No exception traps. */
242 /* No exception traps. */
246 #endif /* !SOFTFLOAT */
248 #endif /* __BSD_VISIBLE */
252 #endif /* !_FENV_H_ */