fenv.h revision 1.3 1 /* $NetBSD: fenv.h,v 1.3 2015/12/29 16:02:37 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2015 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Christos Zoulas.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #ifndef _M68K_FENV_H_
33 #define _M68K_FENV_H_
34
35 #include <sys/stdint.h>
36 #include <m68k/float.h>
37 #include <m68k/fpreg.h>
38
39 #ifndef __fenv_static
40 #define __fenv_static static
41 #endif
42
43 /* Exception bits, from FPSR */
44 #define FE_INEXACT FPSR_AINEX
45 #define FE_DIVBYZERO FPSR_ADZ
46 #define FE_UNDERFLOW FPSR_AUNFL
47 #define FE_OVERFLOW FPSR_AOVFL
48 #define FE_INVALID FPSR_AIOP
49
50 #define FE_ALL_EXCEPT \
51 (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
52
53 /* Rounding modes, from FPSR */
54 #define FE_TONEAREST FPCR_NEAR
55 #define FE_TOWARDZERO FPCR_ZERO
56 #define FE_DOWNWARD FPCR_MINF
57 #define FE_UPWARD FPCR_PINF
58
59 #define _ROUND_MASK \
60 (FE_TONEAREST | FE_TOWARDZERO | FE_DOWNWARD | FE_UPWARD)
61
62 #if !defined(__mc68010__) && !defined(__mcoldfire__)
63
64 typedef uint32_t fexcept_t;
65
66 /* same layout as fmovem */
67 typedef struct {
68 uint32_t fpcr;
69 uint32_t fpsr;
70 uint32_t fppc;
71 } fenv_t;
72
73 #define FE_DFL_ENV ((fenv_t *) -1)
74
75 #define __get_fpcr(__fpcr) \
76 __asm__ __volatile__ ("fmove%.l %!,%0" : "=dm" (__fpcr))
77 #define __set_fpcr(__fpcr) \
78 __asm__ __volatile__ ("fmove%.l %0,%!" : : "dm" (__fpcr))
79
80 #define __get_fpsr(__fpsr) \
81 __asm__ __volatile__ ("fmove%.l %/fpsr,%0" : "=dm" (__fpsr))
82 #define __set_fpsr(__fpsr) \
83 __asm__ __volatile__ ("fmove%.l %0,%/fpsr" : : "dm" (__fpsr))
84
85 #define __fmul(__s, __t, __d) \
86 do { \
87 __t d = __d; \
88 __asm__ __volatile__ ("fmul" __s "; fnop" : "=f" (d) : "0" (d)); \
89 } while (/*CONSTCOND*/0)
90
91 #define __fdiv(__s, __t, __d) \
92 do { \
93 __t d = __d; \
94 __asm__ __volatile__ ("fdiv" __s "; fnop" : "=f" (d) : "0" (d)); \
95 } while (/*CONSTCOND*/0)
96
97 #define __fetox(__s, __t, __d) \
98 do { \
99 __t d = __d; \
100 __asm__ __volatile__ ("fetox" __s "; fnop" : "=f" (d) : "0" (d)); \
101 } while (/*CONSTCOND*/0)
102
103 #define __fgetenv(__envp) \
104 __asm__ __volatile__ ("fmovem%.l %/fpcr/%/fpsr/%/fpiar,%0" : "=m" (__envp))
105
106 #define __fsetenv(__envp) \
107 __asm__ __volatile__ ("fmovem%.l %0,%/fpcr/%/fpsr/%/fpiar" : : "m" (__envp))
108
109 __BEGIN_DECLS
110
111 __fenv_static inline int
112 feclearexcept(int __excepts)
113 {
114 fexcept_t __fpsr;
115
116 __excepts &= FE_ALL_EXCEPT;
117
118 __get_fpsr(__fpsr);
119 __fpsr &= ~__excepts;
120 __set_fpsr(__fpsr);
121
122 return 0;
123 }
124
125 __fenv_static inline int
126 fegetexceptflag(fexcept_t *__flagp, int __excepts)
127 {
128 fexcept_t __fpsr;
129
130 __get_fpsr(__fpsr);
131
132 *__flagp = __fpsr & __excepts & FE_ALL_EXCEPT;
133
134 return 0;
135 }
136
137 __fenv_static inline int
138 fesetexceptflag(const fexcept_t *__flagp, int __excepts)
139 {
140 fexcept_t __fpsr;
141
142 __get_fpsr(__fpsr);
143
144 __fpsr &= ~(__excepts & FE_ALL_EXCEPT);
145 __fpsr |= *__flagp & __excepts & FE_ALL_EXCEPT;
146
147 __set_fpsr(__fpsr);
148
149 return 0;
150 }
151
152 __fenv_static inline int
153 feraiseexcept(int __excepts)
154 {
155 if (__excepts & FE_INVALID) /* Inf * 0 */
156 __fmul("%.s %#0r0,%0", double, __builtin_huge_val());
157
158 if (__excepts & FE_DIVBYZERO) /* 1.0 / 0 */
159 __fdiv("%.s %#0r0,%0", double, 1.0);
160
161 if (__excepts & FE_OVERFLOW) /* MAX * MAX */
162 __fmul("%.x %0,%0", long double, LDBL_MAX);
163
164 if (__excepts & FE_UNDERFLOW) /* e ^ -MAX */
165 __fetox("%.x %0", long double, -LDBL_MAX);
166
167 if (__excepts & FE_INEXACT) /* 1 / 3 */
168 __fdiv("%.s %#0r3,%0", long double, 1.0);
169
170 return 0;
171 }
172
173 __fenv_static inline int
174 fetestexcept(int __excepts)
175 {
176 fexcept_t __fpsr;
177
178 __get_fpsr(__fpsr);
179
180 return __fpsr & __excepts & FE_ALL_EXCEPT;
181 }
182
183 __fenv_static inline int
184 fegetround(void)
185 {
186 fexcept_t __fpcr;
187
188 __get_fpcr(__fpcr);
189 return __fpcr & _ROUND_MASK;
190 }
191
192 __fenv_static inline int
193 fesetround(int __round)
194 {
195 fexcept_t __fpcr;
196
197 if (__round & ~_ROUND_MASK)
198 return -1;
199
200 __get_fpcr(__fpcr);
201
202 __fpcr &= ~_ROUND_MASK;
203 __fpcr |= __round;
204
205 __set_fpcr(__fpcr);
206
207 return 0;
208 }
209
210 __fenv_static inline int
211 fegetenv(fenv_t *__envp)
212 {
213 __fgetenv(__envp);
214
215 return 0;
216 }
217
218 __fenv_static inline int
219 feholdexcept(fenv_t *__envp)
220 {
221 fexcept_t __fpcr, __fpsr;
222
223 __fgetenv(__envp);
224 __fpsr = __envp->fpsr & ~FE_ALL_EXCEPT;
225 __set_fpsr(__fpsr); /* clear all */
226 __fpcr = __envp->fpcr & ~(FE_ALL_EXCEPT << 6);
227 __set_fpcr(__fpcr); /* set non/stop */
228
229 return 0;
230 }
231
232 __fenv_static inline int
233 fesetenv(const fenv_t *__envp)
234 {
235 fenv_t __tenv;
236
237 __fgetenv(__tenv);
238
239 if (__envp == FE_DFL_ENV) {
240 __tenv.fpcr |=
241 __envp->fpcr & ((FE_ALL_EXCEPT << 6) | FE_UPWARD);
242 __tenv.fpsr |= __envp->fpsr & FE_ALL_EXCEPT;
243 }
244
245 __fsetenv(__tenv);
246
247 return 0;
248 }
249
250 __fenv_static inline int
251 feupdateenv(const fenv_t *__envp)
252 {
253 fexcept_t __fpsr;
254
255 __get_fpsr(__fpsr);
256 __fpsr &= FE_ALL_EXCEPT;
257 fesetenv(__envp);
258 feraiseexcept((int)__fpsr);
259 return 0;
260 }
261
262 #if defined(_NETBSD_SOURCE) || defined(_GNU_SOURCE)
263
264 /* We currently provide no external definitions of the functions below. */
265
266 static inline int
267 feenableexcept(int __mask)
268 {
269 fexcept_t __fpsr, __oldmask;
270
271 __get_fpsr(__fpsr);
272 __oldmask = __fpsr & FE_ALL_EXCEPT;
273 __fpsr |= __mask & FE_ALL_EXCEPT;
274 __set_fpsr(__fpsr);
275
276 return __oldmask;
277 }
278
279 static inline int
280 fedisableexcept(int __mask)
281 {
282 fexcept_t __fpsr, __oldmask;
283
284 __get_fpsr(__fpsr);
285 __oldmask = __fpsr & FE_ALL_EXCEPT;
286 __fpsr &= ~(__mask & FE_ALL_EXCEPT);
287 __set_fpsr(__fpsr);
288
289 return __oldmask;
290 }
291
292 static inline int
293 fegetexcept(void)
294 {
295 fexcept_t __fpsr;
296
297 __get_fpsr(__fpsr);
298
299 return __fpsr & FE_ALL_EXCEPT;
300 }
301
302 #endif /* _NETBSD_SOURCE || _GNU_SOURCE */
303
304 #endif /* !__m68010__ && !__mcoldfire__ */
305
306 __END_DECLS
307
308 #endif /* _M68K_FENV_H_ */
309