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8760d94e PB |
1 | #ifndef _URCU_UATOMIC_GENERIC_H |
2 | #define _URCU_UATOMIC_GENERIC_H | |
3 | ||
4 | /* | |
5 | * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved. | |
6 | * Copyright (c) 1996-1999 by Silicon Graphics. All rights reserved. | |
7 | * Copyright (c) 1999-2004 Hewlett-Packard Development Company, L.P. | |
8 | * Copyright (c) 2009 Mathieu Desnoyers | |
9 | * Copyright (c) 2010 Paolo Bonzini | |
10 | * | |
11 | * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED | |
12 | * OR IMPLIED. ANY USE IS AT YOUR OWN RISK. | |
13 | * | |
14 | * Permission is hereby granted to use or copy this program | |
15 | * for any purpose, provided the above notices are retained on all copies. | |
16 | * Permission to modify the code and to distribute modified code is granted, | |
17 | * provided the above notices are retained, and a notice that the code was | |
18 | * modified is included with the above copyright notice. | |
19 | * | |
20 | * Code inspired from libuatomic_ops-1.2, inherited in part from the | |
21 | * Boehm-Demers-Weiser conservative garbage collector. | |
22 | */ | |
23 | ||
24 | #include <urcu/compiler.h> | |
25 | #include <urcu/system.h> | |
26 | ||
27 | #ifdef __cplusplus | |
28 | extern "C" { | |
29 | #endif | |
30 | ||
8760d94e | 31 | #ifndef uatomic_set |
6cf3827c | 32 | #define uatomic_set(addr, v) CMM_STORE_SHARED(*(addr), (v)) |
8760d94e PB |
33 | #endif |
34 | ||
35 | #ifndef uatomic_read | |
6cf3827c | 36 | #define uatomic_read(addr) CMM_LOAD_SHARED(*(addr)) |
8760d94e PB |
37 | #endif |
38 | ||
39 | #if !defined __OPTIMIZE__ || defined UATOMIC_NO_LINK_ERROR | |
40 | static inline __attribute__((always_inline)) | |
41 | void _uatomic_link_error() | |
42 | { | |
43 | #ifdef ILLEGAL_INSTR | |
44 | /* generate an illegal instruction. Cannot catch this with linker tricks | |
45 | * when optimizations are disabled. */ | |
46 | __asm__ __volatile__(ILLEGAL_INSTR); | |
47 | #else | |
48 | __builtin_trap (); | |
49 | #endif | |
50 | } | |
51 | ||
52 | #else /* #if !defined __OPTIMIZE__ || defined UATOMIC_NO_LINK_ERROR */ | |
53 | extern void _uatomic_link_error (); | |
54 | #endif /* #else #if !defined __OPTIMIZE__ || defined UATOMIC_NO_LINK_ERROR */ | |
55 | ||
56 | /* cmpxchg */ | |
57 | ||
58 | #ifndef uatomic_cmpxchg | |
59 | static inline __attribute__((always_inline)) | |
60 | unsigned long _uatomic_cmpxchg(void *addr, unsigned long old, | |
61 | unsigned long _new, int len) | |
62 | { | |
63 | switch (len) { | |
f469d839 PB |
64 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
65 | case 1: | |
66 | return __sync_val_compare_and_swap_1(addr, old, _new); | |
67 | #endif | |
68 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
69 | case 2: | |
70 | return __sync_val_compare_and_swap_2(addr, old, _new); | |
71 | #endif | |
8760d94e PB |
72 | case 4: |
73 | return __sync_val_compare_and_swap_4(addr, old, _new); | |
b39e1761 | 74 | #if (CAA_BITS_PER_LONG == 64) |
8760d94e PB |
75 | case 8: |
76 | return __sync_val_compare_and_swap_8(addr, old, _new); | |
77 | #endif | |
78 | } | |
79 | _uatomic_link_error(); | |
80 | return 0; | |
81 | } | |
82 | ||
83 | ||
84 | #define uatomic_cmpxchg(addr, old, _new) \ | |
85 | ((__typeof__(*(addr))) _uatomic_cmpxchg((addr), (unsigned long)(old),\ | |
86 | (unsigned long)(_new), \ | |
87 | sizeof(*(addr)))) | |
88 | ||
89 | ||
bf33aaea PB |
90 | /* uatomic_and */ |
91 | ||
92 | #ifndef uatomic_and | |
93 | static inline __attribute__((always_inline)) | |
94 | void _uatomic_and(void *addr, unsigned long val, | |
95 | int len) | |
96 | { | |
97 | switch (len) { | |
98 | #ifdef UATOMIC_HAS_ATOMIC_BYTE | |
99 | case 1: | |
100 | __sync_and_and_fetch_1(addr, val); | |
c51d5c6e | 101 | return; |
bf33aaea PB |
102 | #endif |
103 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
104 | case 2: | |
105 | __sync_and_and_fetch_2(addr, val); | |
c51d5c6e | 106 | return; |
bf33aaea PB |
107 | #endif |
108 | case 4: | |
109 | __sync_and_and_fetch_4(addr, val); | |
c51d5c6e | 110 | return; |
bf33aaea PB |
111 | #if (CAA_BITS_PER_LONG == 64) |
112 | case 8: | |
113 | __sync_and_and_fetch_8(addr, val); | |
c51d5c6e | 114 | return; |
bf33aaea PB |
115 | #endif |
116 | } | |
117 | _uatomic_link_error(); | |
bf33aaea PB |
118 | } |
119 | ||
120 | #define uatomic_and(addr, v) \ | |
121 | (_uatomic_and((addr), \ | |
122 | (unsigned long)(v), \ | |
123 | sizeof(*(addr)))) | |
124 | #endif | |
125 | ||
985b35b1 PB |
126 | /* uatomic_or */ |
127 | ||
128 | #ifndef uatomic_or | |
129 | static inline __attribute__((always_inline)) | |
130 | void _uatomic_or(void *addr, unsigned long val, | |
131 | int len) | |
132 | { | |
133 | switch (len) { | |
134 | #ifdef UATOMIC_HAS_ATOMIC_BYTE | |
135 | case 1: | |
136 | __sync_or_and_fetch_1(addr, val); | |
c51d5c6e | 137 | return; |
985b35b1 PB |
138 | #endif |
139 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
140 | case 2: | |
141 | __sync_or_and_fetch_2(addr, val); | |
c51d5c6e | 142 | return; |
985b35b1 PB |
143 | #endif |
144 | case 4: | |
145 | __sync_or_and_fetch_4(addr, val); | |
c51d5c6e | 146 | return; |
985b35b1 PB |
147 | #if (CAA_BITS_PER_LONG == 64) |
148 | case 8: | |
149 | __sync_or_and_fetch_8(addr, val); | |
c51d5c6e | 150 | return; |
985b35b1 PB |
151 | #endif |
152 | } | |
153 | _uatomic_link_error(); | |
c51d5c6e | 154 | return; |
985b35b1 PB |
155 | } |
156 | ||
157 | #define uatomic_or(addr, v) \ | |
158 | (_uatomic_or((addr), \ | |
159 | (unsigned long)(v), \ | |
160 | sizeof(*(addr)))) | |
161 | #endif | |
162 | ||
8760d94e PB |
163 | /* uatomic_add_return */ |
164 | ||
165 | #ifndef uatomic_add_return | |
166 | static inline __attribute__((always_inline)) | |
167 | unsigned long _uatomic_add_return(void *addr, unsigned long val, | |
168 | int len) | |
169 | { | |
170 | switch (len) { | |
f469d839 PB |
171 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
172 | case 1: | |
173 | return __sync_add_and_fetch_1(addr, val); | |
174 | #endif | |
175 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
176 | case 2: | |
177 | return __sync_add_and_fetch_2(addr, val); | |
178 | #endif | |
8760d94e PB |
179 | case 4: |
180 | return __sync_add_and_fetch_4(addr, val); | |
b39e1761 | 181 | #if (CAA_BITS_PER_LONG == 64) |
8760d94e PB |
182 | case 8: |
183 | return __sync_add_and_fetch_8(addr, val); | |
184 | #endif | |
185 | } | |
186 | _uatomic_link_error(); | |
187 | return 0; | |
188 | } | |
189 | ||
190 | ||
191 | #define uatomic_add_return(addr, v) \ | |
192 | ((__typeof__(*(addr))) _uatomic_add_return((addr), \ | |
193 | (unsigned long)(v), \ | |
194 | sizeof(*(addr)))) | |
195 | #endif /* #ifndef uatomic_add_return */ | |
196 | ||
197 | #ifndef uatomic_xchg | |
198 | /* xchg */ | |
199 | ||
200 | static inline __attribute__((always_inline)) | |
201 | unsigned long _uatomic_exchange(void *addr, unsigned long val, int len) | |
202 | { | |
203 | switch (len) { | |
f469d839 PB |
204 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
205 | case 1: | |
206 | { | |
207 | unsigned char old; | |
208 | ||
209 | do { | |
210 | old = uatomic_read((unsigned char *)addr); | |
211 | } while (!__sync_bool_compare_and_swap_1(addr, old, val)); | |
212 | ||
213 | return old; | |
214 | } | |
215 | #endif | |
216 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
217 | case 2: | |
218 | { | |
219 | unsigned short old; | |
220 | ||
221 | do { | |
222 | old = uatomic_read((unsigned short *)addr); | |
223 | } while (!__sync_bool_compare_and_swap_2(addr, old, val)); | |
224 | ||
225 | return old; | |
226 | } | |
227 | #endif | |
8760d94e PB |
228 | case 4: |
229 | { | |
230 | unsigned int old; | |
231 | ||
232 | do { | |
233 | old = uatomic_read((unsigned int *)addr); | |
2f2908d0 | 234 | } while (!__sync_bool_compare_and_swap_4(addr, old, val)); |
8760d94e | 235 | |
2f2908d0 | 236 | return old; |
8760d94e | 237 | } |
b39e1761 | 238 | #if (CAA_BITS_PER_LONG == 64) |
8760d94e PB |
239 | case 8: |
240 | { | |
241 | unsigned long old; | |
242 | ||
243 | do { | |
244 | old = uatomic_read((unsigned long *)addr); | |
245 | } while (!__sync_bool_compare_and_swap_8(addr, old, val)); | |
246 | ||
247 | return old; | |
248 | } | |
249 | #endif | |
250 | } | |
251 | _uatomic_link_error(); | |
252 | return 0; | |
253 | } | |
254 | ||
255 | #define uatomic_xchg(addr, v) \ | |
256 | ((__typeof__(*(addr))) _uatomic_exchange((addr), (unsigned long)(v), \ | |
257 | sizeof(*(addr)))) | |
258 | #endif /* #ifndef uatomic_xchg */ | |
259 | ||
260 | #else /* #ifndef uatomic_cmpxchg */ | |
261 | ||
bf33aaea PB |
262 | #ifndef uatomic_and |
263 | /* uatomic_and */ | |
264 | ||
265 | static inline __attribute__((always_inline)) | |
266 | void _uatomic_and(void *addr, unsigned long val, int len) | |
267 | { | |
268 | switch (len) { | |
269 | #ifdef UATOMIC_HAS_ATOMIC_BYTE | |
270 | case 1: | |
271 | { | |
272 | unsigned char old, oldt; | |
273 | ||
274 | oldt = uatomic_read((unsigned char *)addr); | |
275 | do { | |
276 | old = oldt; | |
277 | oldt = _uatomic_cmpxchg(addr, old, old & val, 1); | |
278 | } while (oldt != old); | |
e6e5957d MD |
279 | |
280 | return; | |
bf33aaea PB |
281 | } |
282 | #endif | |
283 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
284 | case 2: | |
285 | { | |
286 | unsigned short old, oldt; | |
287 | ||
288 | oldt = uatomic_read((unsigned short *)addr); | |
289 | do { | |
290 | old = oldt; | |
291 | oldt = _uatomic_cmpxchg(addr, old, old & val, 2); | |
292 | } while (oldt != old); | |
293 | } | |
294 | #endif | |
295 | case 4: | |
296 | { | |
297 | unsigned int old, oldt; | |
298 | ||
299 | oldt = uatomic_read((unsigned int *)addr); | |
300 | do { | |
301 | old = oldt; | |
302 | oldt = _uatomic_cmpxchg(addr, old, old & val, 4); | |
303 | } while (oldt != old); | |
e6e5957d MD |
304 | |
305 | return; | |
bf33aaea PB |
306 | } |
307 | #if (CAA_BITS_PER_LONG == 64) | |
308 | case 8: | |
309 | { | |
310 | unsigned long old, oldt; | |
311 | ||
312 | oldt = uatomic_read((unsigned long *)addr); | |
313 | do { | |
314 | old = oldt; | |
315 | oldt = _uatomic_cmpxchg(addr, old, old & val, 8); | |
316 | } while (oldt != old); | |
e6e5957d MD |
317 | |
318 | return; | |
bf33aaea PB |
319 | } |
320 | #endif | |
321 | } | |
322 | _uatomic_link_error(); | |
bf33aaea PB |
323 | } |
324 | ||
325 | #define uatomic_and(addr, v) \ | |
ef6ca022 | 326 | (_uatomic_and((addr), \ |
bf33aaea PB |
327 | (unsigned long)(v), \ |
328 | sizeof(*(addr)))) | |
329 | #endif /* #ifndef uatomic_and */ | |
330 | ||
985b35b1 PB |
331 | #ifndef uatomic_or |
332 | /* uatomic_or */ | |
333 | ||
334 | static inline __attribute__((always_inline)) | |
335 | void _uatomic_or(void *addr, unsigned long val, int len) | |
336 | { | |
337 | switch (len) { | |
338 | #ifdef UATOMIC_HAS_ATOMIC_BYTE | |
339 | case 1: | |
340 | { | |
341 | unsigned char old, oldt; | |
342 | ||
343 | oldt = uatomic_read((unsigned char *)addr); | |
344 | do { | |
345 | old = oldt; | |
346 | oldt = _uatomic_cmpxchg(addr, old, old | val, 1); | |
347 | } while (oldt != old); | |
e6e5957d MD |
348 | |
349 | return; | |
985b35b1 PB |
350 | } |
351 | #endif | |
352 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
353 | case 2: | |
354 | { | |
355 | unsigned short old, oldt; | |
356 | ||
357 | oldt = uatomic_read((unsigned short *)addr); | |
358 | do { | |
359 | old = oldt; | |
360 | oldt = _uatomic_cmpxchg(addr, old, old | val, 2); | |
361 | } while (oldt != old); | |
e6e5957d MD |
362 | |
363 | return; | |
985b35b1 PB |
364 | } |
365 | #endif | |
366 | case 4: | |
367 | { | |
368 | unsigned int old, oldt; | |
369 | ||
370 | oldt = uatomic_read((unsigned int *)addr); | |
371 | do { | |
372 | old = oldt; | |
373 | oldt = _uatomic_cmpxchg(addr, old, old | val, 4); | |
374 | } while (oldt != old); | |
e6e5957d MD |
375 | |
376 | return; | |
985b35b1 PB |
377 | } |
378 | #if (CAA_BITS_PER_LONG == 64) | |
379 | case 8: | |
380 | { | |
381 | unsigned long old, oldt; | |
382 | ||
383 | oldt = uatomic_read((unsigned long *)addr); | |
384 | do { | |
385 | old = oldt; | |
386 | oldt = _uatomic_cmpxchg(addr, old, old | val, 8); | |
387 | } while (oldt != old); | |
e6e5957d MD |
388 | |
389 | return; | |
985b35b1 PB |
390 | } |
391 | #endif | |
392 | } | |
393 | _uatomic_link_error(); | |
985b35b1 PB |
394 | } |
395 | ||
396 | #define uatomic_or(addr, v) \ | |
ef6ca022 MD |
397 | (_uatomic_or((addr), \ |
398 | (unsigned long)(v),\ | |
399 | sizeof(*(addr)))) | |
985b35b1 PB |
400 | #endif /* #ifndef uatomic_or */ |
401 | ||
8760d94e PB |
402 | #ifndef uatomic_add_return |
403 | /* uatomic_add_return */ | |
404 | ||
405 | static inline __attribute__((always_inline)) | |
406 | unsigned long _uatomic_add_return(void *addr, unsigned long val, int len) | |
407 | { | |
408 | switch (len) { | |
f469d839 PB |
409 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
410 | case 1: | |
411 | { | |
412 | unsigned char old, oldt; | |
413 | ||
414 | oldt = uatomic_read((unsigned char *)addr); | |
415 | do { | |
416 | old = oldt; | |
b4e6d540 PB |
417 | oldt = uatomic_cmpxchg((unsigned char *)addr, |
418 | old, old + val); | |
f469d839 PB |
419 | } while (oldt != old); |
420 | ||
421 | return old + val; | |
422 | } | |
423 | #endif | |
424 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
425 | case 2: | |
426 | { | |
427 | unsigned short old, oldt; | |
428 | ||
429 | oldt = uatomic_read((unsigned short *)addr); | |
430 | do { | |
431 | old = oldt; | |
b4e6d540 PB |
432 | oldt = uatomic_cmpxchg((unsigned short *)addr, |
433 | old, old + val); | |
f469d839 PB |
434 | } while (oldt != old); |
435 | ||
436 | return old + val; | |
437 | } | |
438 | #endif | |
8760d94e PB |
439 | case 4: |
440 | { | |
441 | unsigned int old, oldt; | |
442 | ||
443 | oldt = uatomic_read((unsigned int *)addr); | |
444 | do { | |
445 | old = oldt; | |
b4e6d540 PB |
446 | oldt = uatomic_cmpxchg((unsigned int *)addr, |
447 | old, old + val); | |
8760d94e PB |
448 | } while (oldt != old); |
449 | ||
450 | return old + val; | |
451 | } | |
b39e1761 | 452 | #if (CAA_BITS_PER_LONG == 64) |
8760d94e PB |
453 | case 8: |
454 | { | |
455 | unsigned long old, oldt; | |
456 | ||
457 | oldt = uatomic_read((unsigned long *)addr); | |
458 | do { | |
459 | old = oldt; | |
b4e6d540 PB |
460 | oldt = uatomic_cmpxchg((unsigned long *)addr, |
461 | old, old + val); | |
8760d94e PB |
462 | } while (oldt != old); |
463 | ||
464 | return old + val; | |
465 | } | |
466 | #endif | |
467 | } | |
468 | _uatomic_link_error(); | |
469 | return 0; | |
470 | } | |
471 | ||
472 | #define uatomic_add_return(addr, v) \ | |
473 | ((__typeof__(*(addr))) _uatomic_add_return((addr), \ | |
474 | (unsigned long)(v), \ | |
475 | sizeof(*(addr)))) | |
476 | #endif /* #ifndef uatomic_add_return */ | |
477 | ||
478 | #ifndef uatomic_xchg | |
479 | /* xchg */ | |
480 | ||
481 | static inline __attribute__((always_inline)) | |
482 | unsigned long _uatomic_exchange(void *addr, unsigned long val, int len) | |
483 | { | |
484 | switch (len) { | |
f469d839 PB |
485 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
486 | case 1: | |
487 | { | |
488 | unsigned char old, oldt; | |
489 | ||
490 | oldt = uatomic_read((unsigned char *)addr); | |
491 | do { | |
492 | old = oldt; | |
b4e6d540 PB |
493 | oldt = uatomic_cmpxchg((unsigned char *)addr, |
494 | old, val); | |
f469d839 PB |
495 | } while (oldt != old); |
496 | ||
497 | return old; | |
498 | } | |
499 | #endif | |
500 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
501 | case 2: | |
502 | { | |
503 | unsigned short old, oldt; | |
504 | ||
505 | oldt = uatomic_read((unsigned short *)addr); | |
506 | do { | |
507 | old = oldt; | |
b4e6d540 PB |
508 | oldt = uatomic_cmpxchg((unsigned short *)addr, |
509 | old, val); | |
f469d839 PB |
510 | } while (oldt != old); |
511 | ||
512 | return old; | |
513 | } | |
514 | #endif | |
8760d94e PB |
515 | case 4: |
516 | { | |
517 | unsigned int old, oldt; | |
518 | ||
519 | oldt = uatomic_read((unsigned int *)addr); | |
520 | do { | |
521 | old = oldt; | |
b4e6d540 PB |
522 | oldt = uatomic_cmpxchg((unsigned int *)addr, |
523 | old, val); | |
8760d94e PB |
524 | } while (oldt != old); |
525 | ||
526 | return old; | |
527 | } | |
b39e1761 | 528 | #if (CAA_BITS_PER_LONG == 64) |
8760d94e PB |
529 | case 8: |
530 | { | |
531 | unsigned long old, oldt; | |
532 | ||
533 | oldt = uatomic_read((unsigned long *)addr); | |
534 | do { | |
535 | old = oldt; | |
b4e6d540 PB |
536 | oldt = uatomic_cmpxchg((unsigned long *)addr, |
537 | old, val); | |
8760d94e PB |
538 | } while (oldt != old); |
539 | ||
540 | return old; | |
541 | } | |
542 | #endif | |
543 | } | |
544 | _uatomic_link_error(); | |
545 | return 0; | |
546 | } | |
547 | ||
548 | #define uatomic_xchg(addr, v) \ | |
549 | ((__typeof__(*(addr))) _uatomic_exchange((addr), (unsigned long)(v), \ | |
550 | sizeof(*(addr)))) | |
551 | #endif /* #ifndef uatomic_xchg */ | |
552 | ||
553 | #endif /* #else #ifndef uatomic_cmpxchg */ | |
554 | ||
555 | /* uatomic_sub_return, uatomic_add, uatomic_sub, uatomic_inc, uatomic_dec */ | |
556 | ||
557 | #ifndef uatomic_add | |
558 | #define uatomic_add(addr, v) (void)uatomic_add_return((addr), (v)) | |
559 | #endif | |
560 | ||
561 | #define uatomic_sub_return(addr, v) uatomic_add_return((addr), -(v)) | |
562 | #define uatomic_sub(addr, v) uatomic_add((addr), -(v)) | |
563 | ||
564 | #ifndef uatomic_inc | |
565 | #define uatomic_inc(addr) uatomic_add((addr), 1) | |
566 | #endif | |
567 | ||
568 | #ifndef uatomic_dec | |
569 | #define uatomic_dec(addr) uatomic_add((addr), -1) | |
570 | #endif | |
571 | ||
572 | #ifdef __cplusplus | |
573 | } | |
574 | #endif | |
575 | ||
576 | #endif /* _URCU_UATOMIC_GENERIC_H */ |