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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 | ||
e56d99bf MD |
84 | #define uatomic_cmpxchg(addr, old, _new) \ |
85 | ((__typeof__(*(addr))) _uatomic_cmpxchg((addr), \ | |
86 | caa_cast_long_keep_sign(old), \ | |
87 | caa_cast_long_keep_sign(_new),\ | |
8760d94e PB |
88 | sizeof(*(addr)))) |
89 | ||
90 | ||
bf33aaea PB |
91 | /* uatomic_and */ |
92 | ||
93 | #ifndef uatomic_and | |
94 | static inline __attribute__((always_inline)) | |
95 | void _uatomic_and(void *addr, unsigned long val, | |
96 | int len) | |
97 | { | |
98 | switch (len) { | |
99 | #ifdef UATOMIC_HAS_ATOMIC_BYTE | |
100 | case 1: | |
101 | __sync_and_and_fetch_1(addr, val); | |
c51d5c6e | 102 | return; |
bf33aaea PB |
103 | #endif |
104 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
105 | case 2: | |
106 | __sync_and_and_fetch_2(addr, val); | |
c51d5c6e | 107 | return; |
bf33aaea PB |
108 | #endif |
109 | case 4: | |
110 | __sync_and_and_fetch_4(addr, val); | |
c51d5c6e | 111 | return; |
bf33aaea PB |
112 | #if (CAA_BITS_PER_LONG == 64) |
113 | case 8: | |
114 | __sync_and_and_fetch_8(addr, val); | |
c51d5c6e | 115 | return; |
bf33aaea PB |
116 | #endif |
117 | } | |
118 | _uatomic_link_error(); | |
bf33aaea PB |
119 | } |
120 | ||
121 | #define uatomic_and(addr, v) \ | |
122 | (_uatomic_and((addr), \ | |
e56d99bf MD |
123 | caa_cast_long_keep_sign(v), \ |
124 | sizeof(*(addr)))) | |
bf33aaea PB |
125 | #endif |
126 | ||
985b35b1 PB |
127 | /* uatomic_or */ |
128 | ||
129 | #ifndef uatomic_or | |
130 | static inline __attribute__((always_inline)) | |
131 | void _uatomic_or(void *addr, unsigned long val, | |
132 | int len) | |
133 | { | |
134 | switch (len) { | |
135 | #ifdef UATOMIC_HAS_ATOMIC_BYTE | |
136 | case 1: | |
137 | __sync_or_and_fetch_1(addr, val); | |
c51d5c6e | 138 | return; |
985b35b1 PB |
139 | #endif |
140 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
141 | case 2: | |
142 | __sync_or_and_fetch_2(addr, val); | |
c51d5c6e | 143 | return; |
985b35b1 PB |
144 | #endif |
145 | case 4: | |
146 | __sync_or_and_fetch_4(addr, val); | |
c51d5c6e | 147 | return; |
985b35b1 PB |
148 | #if (CAA_BITS_PER_LONG == 64) |
149 | case 8: | |
150 | __sync_or_and_fetch_8(addr, val); | |
c51d5c6e | 151 | return; |
985b35b1 PB |
152 | #endif |
153 | } | |
154 | _uatomic_link_error(); | |
c51d5c6e | 155 | return; |
985b35b1 PB |
156 | } |
157 | ||
158 | #define uatomic_or(addr, v) \ | |
159 | (_uatomic_or((addr), \ | |
e56d99bf MD |
160 | caa_cast_long_keep_sign(v), \ |
161 | sizeof(*(addr)))) | |
985b35b1 PB |
162 | #endif |
163 | ||
8760d94e PB |
164 | /* uatomic_add_return */ |
165 | ||
166 | #ifndef uatomic_add_return | |
167 | static inline __attribute__((always_inline)) | |
168 | unsigned long _uatomic_add_return(void *addr, unsigned long val, | |
169 | int len) | |
170 | { | |
171 | switch (len) { | |
f469d839 PB |
172 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
173 | case 1: | |
174 | return __sync_add_and_fetch_1(addr, val); | |
175 | #endif | |
176 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
177 | case 2: | |
178 | return __sync_add_and_fetch_2(addr, val); | |
179 | #endif | |
8760d94e PB |
180 | case 4: |
181 | return __sync_add_and_fetch_4(addr, val); | |
b39e1761 | 182 | #if (CAA_BITS_PER_LONG == 64) |
8760d94e PB |
183 | case 8: |
184 | return __sync_add_and_fetch_8(addr, val); | |
185 | #endif | |
186 | } | |
187 | _uatomic_link_error(); | |
188 | return 0; | |
189 | } | |
190 | ||
191 | ||
e56d99bf MD |
192 | #define uatomic_add_return(addr, v) \ |
193 | ((__typeof__(*(addr))) _uatomic_add_return((addr), \ | |
194 | caa_cast_long_keep_sign(v), \ | |
195 | sizeof(*(addr)))) | |
8760d94e PB |
196 | #endif /* #ifndef uatomic_add_return */ |
197 | ||
198 | #ifndef uatomic_xchg | |
199 | /* xchg */ | |
200 | ||
201 | static inline __attribute__((always_inline)) | |
202 | unsigned long _uatomic_exchange(void *addr, unsigned long val, int len) | |
203 | { | |
204 | switch (len) { | |
f469d839 PB |
205 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
206 | case 1: | |
207 | { | |
208 | unsigned char old; | |
209 | ||
210 | do { | |
211 | old = uatomic_read((unsigned char *)addr); | |
212 | } while (!__sync_bool_compare_and_swap_1(addr, old, val)); | |
213 | ||
214 | return old; | |
215 | } | |
216 | #endif | |
217 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
218 | case 2: | |
219 | { | |
220 | unsigned short old; | |
221 | ||
222 | do { | |
223 | old = uatomic_read((unsigned short *)addr); | |
224 | } while (!__sync_bool_compare_and_swap_2(addr, old, val)); | |
225 | ||
226 | return old; | |
227 | } | |
228 | #endif | |
8760d94e PB |
229 | case 4: |
230 | { | |
231 | unsigned int old; | |
232 | ||
233 | do { | |
234 | old = uatomic_read((unsigned int *)addr); | |
2f2908d0 | 235 | } while (!__sync_bool_compare_and_swap_4(addr, old, val)); |
8760d94e | 236 | |
2f2908d0 | 237 | return old; |
8760d94e | 238 | } |
b39e1761 | 239 | #if (CAA_BITS_PER_LONG == 64) |
8760d94e PB |
240 | case 8: |
241 | { | |
242 | unsigned long old; | |
243 | ||
244 | do { | |
245 | old = uatomic_read((unsigned long *)addr); | |
246 | } while (!__sync_bool_compare_and_swap_8(addr, old, val)); | |
247 | ||
248 | return old; | |
249 | } | |
250 | #endif | |
251 | } | |
252 | _uatomic_link_error(); | |
253 | return 0; | |
254 | } | |
255 | ||
256 | #define uatomic_xchg(addr, v) \ | |
e56d99bf MD |
257 | ((__typeof__(*(addr))) _uatomic_exchange((addr), \ |
258 | caa_cast_long_keep_sign(v), \ | |
8760d94e PB |
259 | sizeof(*(addr)))) |
260 | #endif /* #ifndef uatomic_xchg */ | |
261 | ||
262 | #else /* #ifndef uatomic_cmpxchg */ | |
263 | ||
bf33aaea PB |
264 | #ifndef uatomic_and |
265 | /* uatomic_and */ | |
266 | ||
267 | static inline __attribute__((always_inline)) | |
268 | void _uatomic_and(void *addr, unsigned long val, int len) | |
269 | { | |
270 | switch (len) { | |
271 | #ifdef UATOMIC_HAS_ATOMIC_BYTE | |
272 | case 1: | |
273 | { | |
274 | unsigned char old, oldt; | |
275 | ||
276 | oldt = uatomic_read((unsigned char *)addr); | |
277 | do { | |
278 | old = oldt; | |
279 | oldt = _uatomic_cmpxchg(addr, old, old & val, 1); | |
280 | } while (oldt != old); | |
e6e5957d MD |
281 | |
282 | return; | |
bf33aaea PB |
283 | } |
284 | #endif | |
285 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
286 | case 2: | |
287 | { | |
288 | unsigned short old, oldt; | |
289 | ||
290 | oldt = uatomic_read((unsigned short *)addr); | |
291 | do { | |
292 | old = oldt; | |
293 | oldt = _uatomic_cmpxchg(addr, old, old & val, 2); | |
294 | } while (oldt != old); | |
295 | } | |
296 | #endif | |
297 | case 4: | |
298 | { | |
299 | unsigned int old, oldt; | |
300 | ||
301 | oldt = uatomic_read((unsigned int *)addr); | |
302 | do { | |
303 | old = oldt; | |
304 | oldt = _uatomic_cmpxchg(addr, old, old & val, 4); | |
305 | } while (oldt != old); | |
e6e5957d MD |
306 | |
307 | return; | |
bf33aaea PB |
308 | } |
309 | #if (CAA_BITS_PER_LONG == 64) | |
310 | case 8: | |
311 | { | |
312 | unsigned long old, oldt; | |
313 | ||
314 | oldt = uatomic_read((unsigned long *)addr); | |
315 | do { | |
316 | old = oldt; | |
317 | oldt = _uatomic_cmpxchg(addr, old, old & val, 8); | |
318 | } while (oldt != old); | |
e6e5957d MD |
319 | |
320 | return; | |
bf33aaea PB |
321 | } |
322 | #endif | |
323 | } | |
324 | _uatomic_link_error(); | |
bf33aaea PB |
325 | } |
326 | ||
e56d99bf MD |
327 | #define uatomic_and(addr, v) \ |
328 | (_uatomic_and((addr), \ | |
329 | caa_cast_long_keep_sign(v), \ | |
330 | sizeof(*(addr)))) | |
bf33aaea PB |
331 | #endif /* #ifndef uatomic_and */ |
332 | ||
985b35b1 PB |
333 | #ifndef uatomic_or |
334 | /* uatomic_or */ | |
335 | ||
336 | static inline __attribute__((always_inline)) | |
337 | void _uatomic_or(void *addr, unsigned long val, int len) | |
338 | { | |
339 | switch (len) { | |
340 | #ifdef UATOMIC_HAS_ATOMIC_BYTE | |
341 | case 1: | |
342 | { | |
343 | unsigned char old, oldt; | |
344 | ||
345 | oldt = uatomic_read((unsigned char *)addr); | |
346 | do { | |
347 | old = oldt; | |
348 | oldt = _uatomic_cmpxchg(addr, old, old | val, 1); | |
349 | } while (oldt != old); | |
e6e5957d MD |
350 | |
351 | return; | |
985b35b1 PB |
352 | } |
353 | #endif | |
354 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
355 | case 2: | |
356 | { | |
357 | unsigned short old, oldt; | |
358 | ||
359 | oldt = uatomic_read((unsigned short *)addr); | |
360 | do { | |
361 | old = oldt; | |
362 | oldt = _uatomic_cmpxchg(addr, old, old | val, 2); | |
363 | } while (oldt != old); | |
e6e5957d MD |
364 | |
365 | return; | |
985b35b1 PB |
366 | } |
367 | #endif | |
368 | case 4: | |
369 | { | |
370 | unsigned int old, oldt; | |
371 | ||
372 | oldt = uatomic_read((unsigned int *)addr); | |
373 | do { | |
374 | old = oldt; | |
375 | oldt = _uatomic_cmpxchg(addr, old, old | val, 4); | |
376 | } while (oldt != old); | |
e6e5957d MD |
377 | |
378 | return; | |
985b35b1 PB |
379 | } |
380 | #if (CAA_BITS_PER_LONG == 64) | |
381 | case 8: | |
382 | { | |
383 | unsigned long old, oldt; | |
384 | ||
385 | oldt = uatomic_read((unsigned long *)addr); | |
386 | do { | |
387 | old = oldt; | |
388 | oldt = _uatomic_cmpxchg(addr, old, old | val, 8); | |
389 | } while (oldt != old); | |
e6e5957d MD |
390 | |
391 | return; | |
985b35b1 PB |
392 | } |
393 | #endif | |
394 | } | |
395 | _uatomic_link_error(); | |
985b35b1 PB |
396 | } |
397 | ||
e56d99bf MD |
398 | #define uatomic_or(addr, v) \ |
399 | (_uatomic_or((addr), \ | |
400 | caa_cast_long_keep_sign(v), \ | |
401 | sizeof(*(addr)))) | |
985b35b1 PB |
402 | #endif /* #ifndef uatomic_or */ |
403 | ||
8760d94e PB |
404 | #ifndef uatomic_add_return |
405 | /* uatomic_add_return */ | |
406 | ||
407 | static inline __attribute__((always_inline)) | |
408 | unsigned long _uatomic_add_return(void *addr, unsigned long val, int len) | |
409 | { | |
410 | switch (len) { | |
f469d839 PB |
411 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
412 | case 1: | |
413 | { | |
414 | unsigned char old, oldt; | |
415 | ||
416 | oldt = uatomic_read((unsigned char *)addr); | |
417 | do { | |
418 | old = oldt; | |
b4e6d540 PB |
419 | oldt = uatomic_cmpxchg((unsigned char *)addr, |
420 | old, old + val); | |
f469d839 PB |
421 | } while (oldt != old); |
422 | ||
423 | return old + val; | |
424 | } | |
425 | #endif | |
426 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
427 | case 2: | |
428 | { | |
429 | unsigned short old, oldt; | |
430 | ||
431 | oldt = uatomic_read((unsigned short *)addr); | |
432 | do { | |
433 | old = oldt; | |
b4e6d540 PB |
434 | oldt = uatomic_cmpxchg((unsigned short *)addr, |
435 | old, old + val); | |
f469d839 PB |
436 | } while (oldt != old); |
437 | ||
438 | return old + val; | |
439 | } | |
440 | #endif | |
8760d94e PB |
441 | case 4: |
442 | { | |
443 | unsigned int old, oldt; | |
444 | ||
445 | oldt = uatomic_read((unsigned int *)addr); | |
446 | do { | |
447 | old = oldt; | |
b4e6d540 PB |
448 | oldt = uatomic_cmpxchg((unsigned int *)addr, |
449 | old, old + val); | |
8760d94e PB |
450 | } while (oldt != old); |
451 | ||
452 | return old + val; | |
453 | } | |
b39e1761 | 454 | #if (CAA_BITS_PER_LONG == 64) |
8760d94e PB |
455 | case 8: |
456 | { | |
457 | unsigned long old, oldt; | |
458 | ||
459 | oldt = uatomic_read((unsigned long *)addr); | |
460 | do { | |
461 | old = oldt; | |
b4e6d540 PB |
462 | oldt = uatomic_cmpxchg((unsigned long *)addr, |
463 | old, old + val); | |
8760d94e PB |
464 | } while (oldt != old); |
465 | ||
466 | return old + val; | |
467 | } | |
468 | #endif | |
469 | } | |
470 | _uatomic_link_error(); | |
471 | return 0; | |
472 | } | |
473 | ||
e56d99bf MD |
474 | #define uatomic_add_return(addr, v) \ |
475 | ((__typeof__(*(addr))) _uatomic_add_return((addr), \ | |
476 | caa_cast_long_keep_sign(v), \ | |
477 | sizeof(*(addr)))) | |
8760d94e PB |
478 | #endif /* #ifndef uatomic_add_return */ |
479 | ||
480 | #ifndef uatomic_xchg | |
481 | /* xchg */ | |
482 | ||
483 | static inline __attribute__((always_inline)) | |
484 | unsigned long _uatomic_exchange(void *addr, unsigned long val, int len) | |
485 | { | |
486 | switch (len) { | |
f469d839 PB |
487 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
488 | case 1: | |
489 | { | |
490 | unsigned char old, oldt; | |
491 | ||
492 | oldt = uatomic_read((unsigned char *)addr); | |
493 | do { | |
494 | old = oldt; | |
b4e6d540 PB |
495 | oldt = uatomic_cmpxchg((unsigned char *)addr, |
496 | old, val); | |
f469d839 PB |
497 | } while (oldt != old); |
498 | ||
499 | return old; | |
500 | } | |
501 | #endif | |
502 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
503 | case 2: | |
504 | { | |
505 | unsigned short old, oldt; | |
506 | ||
507 | oldt = uatomic_read((unsigned short *)addr); | |
508 | do { | |
509 | old = oldt; | |
b4e6d540 PB |
510 | oldt = uatomic_cmpxchg((unsigned short *)addr, |
511 | old, val); | |
f469d839 PB |
512 | } while (oldt != old); |
513 | ||
514 | return old; | |
515 | } | |
516 | #endif | |
8760d94e PB |
517 | case 4: |
518 | { | |
519 | unsigned int old, oldt; | |
520 | ||
521 | oldt = uatomic_read((unsigned int *)addr); | |
522 | do { | |
523 | old = oldt; | |
b4e6d540 PB |
524 | oldt = uatomic_cmpxchg((unsigned int *)addr, |
525 | old, val); | |
8760d94e PB |
526 | } while (oldt != old); |
527 | ||
528 | return old; | |
529 | } | |
b39e1761 | 530 | #if (CAA_BITS_PER_LONG == 64) |
8760d94e PB |
531 | case 8: |
532 | { | |
533 | unsigned long old, oldt; | |
534 | ||
535 | oldt = uatomic_read((unsigned long *)addr); | |
536 | do { | |
537 | old = oldt; | |
b4e6d540 PB |
538 | oldt = uatomic_cmpxchg((unsigned long *)addr, |
539 | old, val); | |
8760d94e PB |
540 | } while (oldt != old); |
541 | ||
542 | return old; | |
543 | } | |
544 | #endif | |
545 | } | |
546 | _uatomic_link_error(); | |
547 | return 0; | |
548 | } | |
549 | ||
550 | #define uatomic_xchg(addr, v) \ | |
e56d99bf MD |
551 | ((__typeof__(*(addr))) _uatomic_exchange((addr), \ |
552 | caa_cast_long_keep_sign(v), \ | |
8760d94e PB |
553 | sizeof(*(addr)))) |
554 | #endif /* #ifndef uatomic_xchg */ | |
555 | ||
556 | #endif /* #else #ifndef uatomic_cmpxchg */ | |
557 | ||
558 | /* uatomic_sub_return, uatomic_add, uatomic_sub, uatomic_inc, uatomic_dec */ | |
559 | ||
560 | #ifndef uatomic_add | |
561 | #define uatomic_add(addr, v) (void)uatomic_add_return((addr), (v)) | |
562 | #endif | |
563 | ||
e56d99bf MD |
564 | #define uatomic_sub_return(addr, v) \ |
565 | uatomic_add_return((addr), -(caa_cast_long_keep_sign(v))) | |
566 | #define uatomic_sub(addr, v) \ | |
567 | uatomic_add((addr), -(caa_cast_long_keep_sign(v))) | |
8760d94e PB |
568 | |
569 | #ifndef uatomic_inc | |
570 | #define uatomic_inc(addr) uatomic_add((addr), 1) | |
571 | #endif | |
572 | ||
573 | #ifndef uatomic_dec | |
574 | #define uatomic_dec(addr) uatomic_add((addr), -1) | |
575 | #endif | |
576 | ||
577 | #ifdef __cplusplus | |
578 | } | |
579 | #endif | |
580 | ||
581 | #endif /* _URCU_UATOMIC_GENERIC_H */ |