1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
|
/* $NetBSD: fenv.h,v 1.8 2019/10/26 17:51:49 christos Exp $ */
/*-
* Copyright (c) 2015 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Christos Zoulas.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _M68K_FENV_H_
#define _M68K_FENV_H_
#include <sys/stdint.h>
#include <m68k/float.h>
#include <m68k/fpreg.h>
/* Exception bits, from FPSR */
#define FE_INEXACT FPSR_AINEX
#define FE_DIVBYZERO FPSR_ADZ
#define FE_UNDERFLOW FPSR_AUNFL
#define FE_OVERFLOW FPSR_AOVFL
#define FE_INVALID FPSR_AIOP
#define FE_ALL_EXCEPT \
(FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
/* Rounding modes, from FPCR */
#define FE_TONEAREST FPCR_NEAR
#define FE_TOWARDZERO FPCR_ZERO
#define FE_DOWNWARD FPCR_MINF
#define FE_UPWARD FPCR_PINF
#define _ROUND_MASK \
(FE_TONEAREST | FE_TOWARDZERO | FE_DOWNWARD | FE_UPWARD)
#if defined(__HAVE_68881__)
#ifndef __fenv_static
#define __fenv_static static
#endif
typedef uint32_t fexcept_t;
/* same layout as fmovem */
typedef struct {
uint32_t fpcr;
uint32_t fpsr;
uint32_t fppc;
} fenv_t;
#define FE_DFL_ENV ((fenv_t *) -1)
#define __get_fpcr(__fpcr) \
__asm__ __volatile__ ("fmove%.l %!,%0" : "=dm" (__fpcr))
#define __set_fpcr(__fpcr) \
__asm__ __volatile__ ("fmove%.l %0,%!" : : "dm" (__fpcr))
#define __get_fpsr(__fpsr) \
__asm__ __volatile__ ("fmove%.l %/fpsr,%0" : "=dm" (__fpsr))
#define __set_fpsr(__fpsr) \
__asm__ __volatile__ ("fmove%.l %0,%/fpsr" : : "dm" (__fpsr))
#define __fmul(__s, __t, __d) \
do { \
__t d = __d; \
__asm__ __volatile__ ("fmul" __s "; fnop" : "=f" (d) : "0" (d)); \
} while (/*CONSTCOND*/0)
#define __fdiv(__s, __t, __d) \
do { \
__t d = __d; \
__asm__ __volatile__ ("fdiv" __s "; fnop" : "=f" (d) : "0" (d)); \
} while (/*CONSTCOND*/0)
#define __fetox(__s, __t, __d) \
do { \
__t d = __d; \
__asm__ __volatile__ ("fetox" __s "; fnop" : "=f" (d) : "0" (d)); \
} while (/*CONSTCOND*/0)
#define __fgetenv(__envp) \
__asm__ __volatile__ ("fmovem%.l %/fpcr/%/fpsr/%/fpiar,%0" : "=m" (__envp))
#define __fsetenv(__envp) \
__asm__ __volatile__ ("fmovem%.l %0,%/fpcr/%/fpsr/%/fpiar" : : "m" (__envp))
__BEGIN_DECLS
#if __GNUC_PREREQ__(8, 0)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wshadow"
#endif
__fenv_static inline int
feclearexcept(int __excepts)
{
fexcept_t __fpsr;
__excepts &= FE_ALL_EXCEPT;
__get_fpsr(__fpsr);
__fpsr &= ~__excepts;
__set_fpsr(__fpsr);
return 0;
}
__fenv_static inline int
fegetexceptflag(fexcept_t *__flagp, int __excepts)
{
fexcept_t __fpsr;
__get_fpsr(__fpsr);
*__flagp = __fpsr & __excepts & FE_ALL_EXCEPT;
return 0;
}
__fenv_static inline int
fesetexceptflag(const fexcept_t *__flagp, int __excepts)
{
fexcept_t __fpsr;
__get_fpsr(__fpsr);
__fpsr &= ~(__excepts & FE_ALL_EXCEPT);
__fpsr |= *__flagp & __excepts & FE_ALL_EXCEPT;
__set_fpsr(__fpsr);
return 0;
}
__fenv_static inline int
feraiseexcept(int __excepts)
{
if (__excepts & FE_INVALID) /* Inf * 0 */
__fmul("%.s %#0r0,%0", double, __builtin_huge_val());
if (__excepts & FE_DIVBYZERO) /* 1.0 / 0 */
__fdiv("%.s %#0r0,%0", double, 1.0);
if (__excepts & FE_OVERFLOW) /* MAX * MAX */
__fmul("%.x %0,%0", long double, LDBL_MAX);
if (__excepts & FE_UNDERFLOW) /* e ^ -MAX */
__fetox("%.x %0", long double, -LDBL_MAX);
if (__excepts & FE_INEXACT) /* 1 / 3 */
__fdiv("%.s %#0r3,%0", long double, 1.0);
return 0;
}
__fenv_static inline int
fetestexcept(int __excepts)
{
fexcept_t __fpsr;
__get_fpsr(__fpsr);
return __fpsr & __excepts & FE_ALL_EXCEPT;
}
__fenv_static inline int
fegetround(void)
{
fexcept_t __fpcr;
__get_fpcr(__fpcr);
return __fpcr & _ROUND_MASK;
}
__fenv_static inline int
fesetround(int __round)
{
fexcept_t __fpcr;
if (__round & ~_ROUND_MASK)
return -1;
__get_fpcr(__fpcr);
__fpcr &= ~_ROUND_MASK;
__fpcr |= __round;
__set_fpcr(__fpcr);
return 0;
}
__fenv_static inline int
fegetenv(fenv_t *__envp)
{
__fgetenv(*__envp);
return 0;
}
__fenv_static inline int
feholdexcept(fenv_t *__envp)
{
fexcept_t __fpcr, __fpsr;
__fgetenv(*__envp);
__fpsr = __envp->fpsr & ~FE_ALL_EXCEPT;
__set_fpsr(__fpsr); /* clear all */
__fpcr = __envp->fpcr & ~(FE_ALL_EXCEPT << 6);
__set_fpcr(__fpcr); /* set non/stop */
return 0;
}
__fenv_static inline int
fesetenv(const fenv_t *__envp)
{
fenv_t __tenv;
__fgetenv(__tenv);
if (__envp == FE_DFL_ENV) {
__tenv.fpcr |=
__envp->fpcr & ((FE_ALL_EXCEPT << 6) | FE_UPWARD);
__tenv.fpsr |= __envp->fpsr & FE_ALL_EXCEPT;
}
__fsetenv(__tenv);
return 0;
}
__fenv_static inline int
feupdateenv(const fenv_t *__envp)
{
fexcept_t __fpsr;
__get_fpsr(__fpsr);
__fpsr &= FE_ALL_EXCEPT;
fesetenv(__envp);
feraiseexcept((int)__fpsr);
return 0;
}
#if __GNUC_PREREQ__(8, 0)
#pragma GCC diagnostic pop
#endif
#if defined(_NETBSD_SOURCE) || defined(_GNU_SOURCE)
__fenv_static inline int
feenableexcept(int __mask)
{
fexcept_t __fpcr, __oldmask;
__get_fpcr(__fpcr);
__oldmask = (__fpcr >> 6) & FE_ALL_EXCEPT;
__fpcr |= (__mask & FE_ALL_EXCEPT) << 6;
__set_fpcr(__fpcr);
return __oldmask;
}
__fenv_static inline int
fedisableexcept(int __mask)
{
fexcept_t __fpcr, __oldmask;
__get_fpcr(__fpcr);
__oldmask = (__fpcr >> 6) & FE_ALL_EXCEPT;
__fpcr &= ~((__mask & FE_ALL_EXCEPT) << 6);
__set_fpcr(__fpcr);
return __oldmask;
}
__fenv_static inline int
fegetexcept(void)
{
fexcept_t __fpcr;
__get_fpcr(__fpcr);
return (__fpcr >> 6) & FE_ALL_EXCEPT;
}
#endif /* _NETBSD_SOURCE || _GNU_SOURCE */
__END_DECLS
#endif /* __HAVE_68881__ */
#endif /* _M68K_FENV_H_ */
|