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
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
|
/* Copyright (C) 2003 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <stdint.h>
typedef int8_t atomic8_t;
typedef uint8_t uatomic8_t;
typedef int_fast8_t atomic_fast8_t;
typedef uint_fast8_t uatomic_fast8_t;
typedef int16_t atomic16_t;
typedef uint16_t uatomic16_t;
typedef int_fast16_t atomic_fast16_t;
typedef uint_fast16_t uatomic_fast16_t;
typedef int32_t atomic32_t;
typedef uint32_t uatomic32_t;
typedef int_fast32_t atomic_fast32_t;
typedef uint_fast32_t uatomic_fast32_t;
typedef int64_t atomic64_t;
typedef uint64_t uatomic64_t;
typedef int_fast64_t atomic_fast64_t;
typedef uint_fast64_t uatomic_fast64_t;
typedef intptr_t atomicptr_t;
typedef uintptr_t uatomicptr_t;
typedef intmax_t atomic_max_t;
typedef uintmax_t uatomic_max_t;
#ifdef UP
# define __MB /* nothing */
#else
# define __MB " mb\n"
#endif
/* Compare and exchange. For all of the "xxx" routines, we expect a
"__prev" and a "__cmp" variable to be provided by the enclosing scope,
in which values are returned. */
#define __arch_compare_and_exchange_xxx_8_int(mem, new, old, mb1, mb2) \
({ \
unsigned long __tmp, __snew, __addr64; \
__asm__ __volatile__ ( \
mb1 \
" andnot %[__addr8],7,%[__addr64]\n" \
" insbl %[__new],%[__addr8],%[__snew]\n" \
"1: ldq_l %[__tmp],0(%[__addr64])\n" \
" extbl %[__tmp],%[__addr8],%[__prev]\n" \
" cmpeq %[__prev],%[__old],%[__cmp]\n" \
" beq %[__cmp],2f\n" \
" mskbl %[__tmp],%[__addr8],%[__tmp]\n" \
" or %[__snew],%[__tmp],%[__tmp]\n" \
" stq_c %[__tmp],0(%[__addr64])\n" \
" beq %[__tmp],1b\n" \
mb2 \
"2:" \
: [__prev] "=&r" (__prev), \
[__snew] "=&r" (__snew), \
[__tmp] "=&r" (__tmp), \
[__cmp] "=&r" (__cmp), \
[__addr64] "=&r" (__addr64) \
: [__addr8] "r" (mem), \
[__old] "Ir" ((uint64_t)(uint8_t)(uint64_t)(old)), \
[__new] "r" (new) \
: "memory"); \
})
#define __arch_compare_and_exchange_xxx_16_int(mem, new, old, mb1, mb2) \
({ \
unsigned long __tmp, __snew, __addr64; \
__asm__ __volatile__ ( \
mb1 \
" andnot %[__addr16],7,%[__addr64]\n" \
" inswl %[__new],%[__addr16],%[__snew]\n" \
"1: ldq_l %[__tmp],0(%[__addr64])\n" \
" extwl %[__tmp],%[__addr16],%[__prev]\n" \
" cmpeq %[__prev],%[__old],%[__cmp]\n" \
" beq %[__cmp],2f\n" \
" mskwl %[__tmp],%[__addr16],%[__tmp]\n" \
" or %[__snew],%[__tmp],%[__tmp]\n" \
" stq_c %[__tmp],0(%[__addr64])\n" \
" beq %[__tmp],1b\n" \
mb2 \
"2:" \
: [__prev] "=&r" (__prev), \
[__snew] "=&r" (__snew), \
[__tmp] "=&r" (__tmp), \
[__cmp] "=&r" (__cmp), \
[__addr64] "=&r" (__addr64) \
: [__addr16] "r" (mem), \
[__old] "Ir" ((uint64_t)(uint16_t)(uint64_t)(old)), \
[__new] "r" (new) \
: "memory"); \
})
#define __arch_compare_and_exchange_xxx_32_int(mem, new, old, mb1, mb2) \
({ \
__asm__ __volatile__ ( \
mb1 \
"1: ldl_l %[__prev],%[__mem]\n" \
" cmpeq %[__prev],%[__old],%[__cmp]\n" \
" beq %[__cmp],2f\n" \
" mov %[__new],%[__cmp]\n" \
" stl_c %[__cmp],%[__mem]\n" \
" beq %[__cmp],1b\n" \
mb2 \
"2:" \
: [__prev] "=&r" (__prev), \
[__cmp] "=&r" (__cmp) \
: [__mem] "m" (*(mem)), \
[__old] "Ir" ((uint64_t)(atomic32_t)(uint64_t)(old)), \
[__new] "Ir" (new) \
: "memory"); \
})
#define __arch_compare_and_exchange_xxx_64_int(mem, new, old, mb1, mb2) \
({ \
__asm__ __volatile__ ( \
mb1 \
"1: ldq_l %[__prev],%[__mem]\n" \
" cmpeq %[__prev],%[__old],%[__cmp]\n" \
" beq %[__cmp],2f\n" \
" mov %[__new],%[__cmp]\n" \
" stq_c %[__cmp],%[__mem]\n" \
" beq %[__cmp],1b\n" \
mb2 \
"2:" \
: [__prev] "=&r" (__prev), \
[__cmp] "=&r" (__cmp) \
: [__mem] "m" (*(mem)), \
[__old] "Ir" ((uint64_t)(old)), \
[__new] "Ir" (new) \
: "memory"); \
})
/* For all "bool" routines, we return FALSE if exchange succesful. */
#define __arch_compare_and_exchange_bool_8_int(mem, new, old, mb1, mb2) \
({ unsigned long __prev; int __cmp; \
__arch_compare_and_exchange_xxx_8_int(mem, new, old, mb1, mb2); \
!__cmp; })
#define __arch_compare_and_exchange_bool_16_int(mem, new, old, mb1, mb2) \
({ unsigned long __prev; int __cmp; \
__arch_compare_and_exchange_xxx_16_int(mem, new, old, mb1, mb2); \
!__cmp; })
#define __arch_compare_and_exchange_bool_32_int(mem, new, old, mb1, mb2) \
({ unsigned long __prev; int __cmp; \
__arch_compare_and_exchange_xxx_32_int(mem, new, old, mb1, mb2); \
!__cmp; })
#define __arch_compare_and_exchange_bool_64_int(mem, new, old, mb1, mb2) \
({ unsigned long __prev; int __cmp; \
__arch_compare_and_exchange_xxx_64_int(mem, new, old, mb1, mb2); \
!__cmp; })
/* For all "val" routines, return the old value whether exchange
successful or not. */
#define __arch_compare_and_exchange_val_8_int(mem, new, old, mb1, mb2) \
({ unsigned long __prev; int __cmp; \
__arch_compare_and_exchange_xxx_8_int(mem, new, old, mb1, mb2); \
(typeof (*mem))__prev; })
#define __arch_compare_and_exchange_val_16_int(mem, new, old, mb1, mb2) \
({ unsigned long __prev; int __cmp; \
__arch_compare_and_exchange_xxx_16_int(mem, new, old, mb1, mb2); \
(typeof (*mem))__prev; })
#define __arch_compare_and_exchange_val_32_int(mem, new, old, mb1, mb2) \
({ unsigned long __prev; int __cmp; \
__arch_compare_and_exchange_xxx_32_int(mem, new, old, mb1, mb2); \
(typeof (*mem))__prev; })
#define __arch_compare_and_exchange_val_64_int(mem, new, old, mb1, mb2) \
({ unsigned long __prev; int __cmp; \
__arch_compare_and_exchange_xxx_64_int(mem, new, old, mb1, mb2); \
(typeof (*mem))__prev; })
/* Compare and exchange with "acquire" semantics, ie barrier after. */
#define atomic_compare_and_exchange_bool_acq(mem, new, old) \
__atomic_bool_bysize (__arch_compare_and_exchange_bool, int, \
mem, new, old, "", __MB)
#define atomic_compare_and_exchange_val_acq(mem, new, old) \
__atomic_val_bysize (__arch_compare_and_exchange_val, int, \
mem, new, old, "", __MB)
/* Compare and exchange with "release" semantics, ie barrier before. */
#define atomic_compare_and_exchange_bool_rel(mem, new, old) \
__atomic_bool_bysize (__arch_compare_and_exchange_bool, int, \
mem, new, old, __MB, "")
#define atomic_compare_and_exchange_val_rel(mem, new, old) \
__atomic_val_bysize (__arch_compare_and_exchange_val, int, \
mem, new, old, __MB, "")
/* Atomically store value and return the previous value. */
#define __arch_exchange_8_int(mem, value, mb1, mb2) \
({ \
unsigned long __ret, __tmp, __addr64, __sval; \
__asm__ __volatile__ ( \
mb1 \
" andnot %[__addr8],7,%[__addr64]\n" \
" insbl %[__value],%[__addr8],%[__sval]\n" \
"1: ldq_l %[__tmp],0(%[__addr64])\n" \
" extbl %[__tmp],%[__addr8],%[__ret]\n" \
" mskbl %[__tmp],%[__addr8],%[__tmp]\n" \
" or %[__sval],%[__tmp],%[__tmp]\n" \
" stq_c %[__tmp],0(%[__addr64])\n" \
" beq %[__tmp],1b\n" \
mb2 \
: [__ret] "=&r" (__ret), \
[__sval] "=&r" (__sval), \
[__tmp] "=&r" (__tmp), \
[__addr64] "=&r" (__addr64) \
: [__addr8] "r" (mem), \
[__value] "r" (value) \
: "memory"); \
__ret; })
#define __arch_exchange_16_int(mem, value, mb1, mb2) \
({ \
unsigned long __ret, __tmp, __addr64, __sval; \
__asm__ __volatile__ ( \
mb1 \
" andnot %[__addr16],7,%[__addr64]\n" \
" inswl %[__value],%[__addr16],%[__sval]\n" \
"1: ldq_l %[__tmp],0(%[__addr64])\n" \
" extwl %[__tmp],%[__addr16],%[__ret]\n" \
" mskwl %[__tmp],%[__addr16],%[__tmp]\n" \
" or %[__sval],%[__tmp],%[__tmp]\n" \
" stq_c %[__tmp],0(%[__addr64])\n" \
" beq %[__tmp],1b\n" \
mb2 \
: [__ret] "=&r" (__ret), \
[__sval] "=&r" (__sval), \
[__tmp] "=&r" (__tmp), \
[__addr64] "=&r" (__addr64) \
: [__addr16] "r" (mem), \
[__value] "r" (value) \
: "memory"); \
__ret; })
#define __arch_exchange_32_int(mem, value, mb1, mb2) \
({ \
signed int __ret, __tmp; \
__asm__ __volatile__ ( \
mb1 \
"1: ldl_l %[__ret],%[__mem]\n" \
" mov %[__val],%[__tmp]\n" \
" stl_c %[__tmp],%[__mem]\n" \
" beq %[__tmp],1b\n" \
mb2 \
: [__ret] "=&r" (__ret), \
[__tmp] "=&r" (__tmp) \
: [__mem] "m" (*(mem)), \
[__val] "Ir" (value) \
: "memory"); \
__ret; })
#define __arch_exchange_64_int(mem, value, mb1, mb2) \
({ \
unsigned long __ret, __tmp; \
__asm__ __volatile__ ( \
mb1 \
"1: ldq_l %[__ret],%[__mem]\n" \
" mov %[__val],%[__tmp]\n" \
" stq_c %[__tmp],%[__mem]\n" \
" beq %[__tmp],1b\n" \
mb2 \
: [__ret] "=&r" (__ret), \
[__tmp] "=&r" (__tmp) \
: [__mem] "m" (*(mem)), \
[__val] "Ir" (value) \
: "memory"); \
__ret; })
#define atomic_exchange_acq(mem, value) \
__atomic_val_bysize (__arch_exchange, int, mem, value, "", __MB)
#define atomic_exchange_rel(mem, value) \
__atomic_val_bysize (__arch_exchange, int, mem, value, __MB, "")
/* Atomically add value and return the previous (unincremented) value. */
#define __arch_exchange_and_add_8_int(mem, value, mb1, mb2) \
({ __builtin_trap (); 0; })
#define __arch_exchange_and_add_16_int(mem, value, mb1, mb2) \
({ __builtin_trap (); 0; })
#define __arch_exchange_and_add_32_int(mem, value, mb1, mb2) \
({ \
signed int __ret, __tmp; \
__asm__ __volatile__ ( \
mb1 \
"1: ldl_l %[__ret],%[__mem]\n" \
" addl %[__ret],%[__val],%[__tmp]\n" \
" stl_c %[__tmp],%[__mem]\n" \
" beq %[__tmp],1b\n" \
mb2 \
: [__ret] "=&r" (__ret), \
[__tmp] "=&r" (__tmp) \
: [__mem] "m" (*(mem)), \
[__val] "Ir" ((signed int)(value)) \
: "memory"); \
__ret; })
#define __arch_exchange_and_add_64_int(mem, value, mb1, mb2) \
({ \
unsigned long __ret, __tmp; \
__asm__ __volatile__ ( \
mb1 \
"1: ldq_l %[__ret],%[__mem]\n" \
" addq %[__ret],%[__val],%[__tmp]\n" \
" stq_c %[__tmp],%[__mem]\n" \
" beq %[__tmp],1b\n" \
mb2 \
: [__ret] "=&r" (__ret), \
[__tmp] "=&r" (__tmp) \
: [__mem] "m" (*(mem)), \
[__val] "Ir" ((unsigned long)(value)) \
: "memory"); \
__ret; })
/* ??? Barrier semantics for atomic_exchange_and_add appear to be
undefined. Use full barrier for now, as that's safe. */
#define atomic_exchange_and_add(mem, value) \
__atomic_val_bysize (__arch_exchange_and_add, int, mem, value, __MB, __MB)
/* ??? Blah, I'm lazy. Implement these later. Can do better than the
compare-and-exchange loop provided by generic code.
#define atomic_decrement_if_positive(mem)
#define atomic_bit_test_set(mem, bit)
*/
#ifndef UP
# define atomic_full_barrier() __asm ("mb" : : : "memory");
# define atomic_read_barrier() __asm ("mb" : : : "memory");
# define atomic_write_barrier() __asm ("wmb" : : : "memory");
#endif
|
