| 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 | |
| 31 | #ifndef uatomic_set |
| 32 | #define uatomic_set(addr, v) CMM_STORE_SHARED(*(addr), (v)) |
| 33 | #endif |
| 34 | |
| 35 | #ifndef uatomic_read |
| 36 | #define uatomic_read(addr) CMM_LOAD_SHARED(*(addr)) |
| 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) { |
| 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 |
| 72 | case 4: |
| 73 | return __sync_val_compare_and_swap_4(addr, old, _new); |
| 74 | #if (CAA_BITS_PER_LONG == 64) |
| 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), \ |
| 86 | caa_cast_long_keep_sign(old), \ |
| 87 | caa_cast_long_keep_sign(_new),\ |
| 88 | sizeof(*(addr)))) |
| 89 | |
| 90 | |
| 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); |
| 102 | return; |
| 103 | #endif |
| 104 | #ifdef UATOMIC_HAS_ATOMIC_SHORT |
| 105 | case 2: |
| 106 | __sync_and_and_fetch_2(addr, val); |
| 107 | return; |
| 108 | #endif |
| 109 | case 4: |
| 110 | __sync_and_and_fetch_4(addr, val); |
| 111 | return; |
| 112 | #if (CAA_BITS_PER_LONG == 64) |
| 113 | case 8: |
| 114 | __sync_and_and_fetch_8(addr, val); |
| 115 | return; |
| 116 | #endif |
| 117 | } |
| 118 | _uatomic_link_error(); |
| 119 | } |
| 120 | |
| 121 | #define uatomic_and(addr, v) \ |
| 122 | (_uatomic_and((addr), \ |
| 123 | caa_cast_long_keep_sign(v), \ |
| 124 | sizeof(*(addr)))) |
| 125 | #define cmm_smp_mb__before_and() cmm_barrier() |
| 126 | #define cmm_smp_mb__after_and() cmm_barrier() |
| 127 | |
| 128 | #endif |
| 129 | |
| 130 | /* uatomic_or */ |
| 131 | |
| 132 | #ifndef uatomic_or |
| 133 | static inline __attribute__((always_inline)) |
| 134 | void _uatomic_or(void *addr, unsigned long val, |
| 135 | int len) |
| 136 | { |
| 137 | switch (len) { |
| 138 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
| 139 | case 1: |
| 140 | __sync_or_and_fetch_1(addr, val); |
| 141 | return; |
| 142 | #endif |
| 143 | #ifdef UATOMIC_HAS_ATOMIC_SHORT |
| 144 | case 2: |
| 145 | __sync_or_and_fetch_2(addr, val); |
| 146 | return; |
| 147 | #endif |
| 148 | case 4: |
| 149 | __sync_or_and_fetch_4(addr, val); |
| 150 | return; |
| 151 | #if (CAA_BITS_PER_LONG == 64) |
| 152 | case 8: |
| 153 | __sync_or_and_fetch_8(addr, val); |
| 154 | return; |
| 155 | #endif |
| 156 | } |
| 157 | _uatomic_link_error(); |
| 158 | return; |
| 159 | } |
| 160 | |
| 161 | #define uatomic_or(addr, v) \ |
| 162 | (_uatomic_or((addr), \ |
| 163 | caa_cast_long_keep_sign(v), \ |
| 164 | sizeof(*(addr)))) |
| 165 | #define cmm_smp_mb__before_or() cmm_barrier() |
| 166 | #define cmm_smp_mb__after_or() cmm_barrier() |
| 167 | |
| 168 | #endif |
| 169 | |
| 170 | |
| 171 | /* uatomic_add_return */ |
| 172 | |
| 173 | #ifndef uatomic_add_return |
| 174 | static inline __attribute__((always_inline)) |
| 175 | unsigned long _uatomic_add_return(void *addr, unsigned long val, |
| 176 | int len) |
| 177 | { |
| 178 | switch (len) { |
| 179 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
| 180 | case 1: |
| 181 | return __sync_add_and_fetch_1(addr, val); |
| 182 | #endif |
| 183 | #ifdef UATOMIC_HAS_ATOMIC_SHORT |
| 184 | case 2: |
| 185 | return __sync_add_and_fetch_2(addr, val); |
| 186 | #endif |
| 187 | case 4: |
| 188 | return __sync_add_and_fetch_4(addr, val); |
| 189 | #if (CAA_BITS_PER_LONG == 64) |
| 190 | case 8: |
| 191 | return __sync_add_and_fetch_8(addr, val); |
| 192 | #endif |
| 193 | } |
| 194 | _uatomic_link_error(); |
| 195 | return 0; |
| 196 | } |
| 197 | |
| 198 | |
| 199 | #define uatomic_add_return(addr, v) \ |
| 200 | ((__typeof__(*(addr))) _uatomic_add_return((addr), \ |
| 201 | caa_cast_long_keep_sign(v), \ |
| 202 | sizeof(*(addr)))) |
| 203 | #endif /* #ifndef uatomic_add_return */ |
| 204 | |
| 205 | #ifndef uatomic_xchg |
| 206 | /* xchg */ |
| 207 | |
| 208 | static inline __attribute__((always_inline)) |
| 209 | unsigned long _uatomic_exchange(void *addr, unsigned long val, int len) |
| 210 | { |
| 211 | switch (len) { |
| 212 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
| 213 | case 1: |
| 214 | { |
| 215 | unsigned char old; |
| 216 | |
| 217 | do { |
| 218 | old = uatomic_read((unsigned char *)addr); |
| 219 | } while (!__sync_bool_compare_and_swap_1(addr, old, val)); |
| 220 | |
| 221 | return old; |
| 222 | } |
| 223 | #endif |
| 224 | #ifdef UATOMIC_HAS_ATOMIC_SHORT |
| 225 | case 2: |
| 226 | { |
| 227 | unsigned short old; |
| 228 | |
| 229 | do { |
| 230 | old = uatomic_read((unsigned short *)addr); |
| 231 | } while (!__sync_bool_compare_and_swap_2(addr, old, val)); |
| 232 | |
| 233 | return old; |
| 234 | } |
| 235 | #endif |
| 236 | case 4: |
| 237 | { |
| 238 | unsigned int old; |
| 239 | |
| 240 | do { |
| 241 | old = uatomic_read((unsigned int *)addr); |
| 242 | } while (!__sync_bool_compare_and_swap_4(addr, old, val)); |
| 243 | |
| 244 | return old; |
| 245 | } |
| 246 | #if (CAA_BITS_PER_LONG == 64) |
| 247 | case 8: |
| 248 | { |
| 249 | unsigned long old; |
| 250 | |
| 251 | do { |
| 252 | old = uatomic_read((unsigned long *)addr); |
| 253 | } while (!__sync_bool_compare_and_swap_8(addr, old, val)); |
| 254 | |
| 255 | return old; |
| 256 | } |
| 257 | #endif |
| 258 | } |
| 259 | _uatomic_link_error(); |
| 260 | return 0; |
| 261 | } |
| 262 | |
| 263 | #define uatomic_xchg(addr, v) \ |
| 264 | ((__typeof__(*(addr))) _uatomic_exchange((addr), \ |
| 265 | caa_cast_long_keep_sign(v), \ |
| 266 | sizeof(*(addr)))) |
| 267 | #endif /* #ifndef uatomic_xchg */ |
| 268 | |
| 269 | #else /* #ifndef uatomic_cmpxchg */ |
| 270 | |
| 271 | #ifndef uatomic_and |
| 272 | /* uatomic_and */ |
| 273 | |
| 274 | static inline __attribute__((always_inline)) |
| 275 | void _uatomic_and(void *addr, unsigned long val, int len) |
| 276 | { |
| 277 | switch (len) { |
| 278 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
| 279 | case 1: |
| 280 | { |
| 281 | unsigned char old, oldt; |
| 282 | |
| 283 | oldt = uatomic_read((unsigned char *)addr); |
| 284 | do { |
| 285 | old = oldt; |
| 286 | oldt = _uatomic_cmpxchg(addr, old, old & val, 1); |
| 287 | } while (oldt != old); |
| 288 | |
| 289 | return; |
| 290 | } |
| 291 | #endif |
| 292 | #ifdef UATOMIC_HAS_ATOMIC_SHORT |
| 293 | case 2: |
| 294 | { |
| 295 | unsigned short old, oldt; |
| 296 | |
| 297 | oldt = uatomic_read((unsigned short *)addr); |
| 298 | do { |
| 299 | old = oldt; |
| 300 | oldt = _uatomic_cmpxchg(addr, old, old & val, 2); |
| 301 | } while (oldt != old); |
| 302 | } |
| 303 | #endif |
| 304 | case 4: |
| 305 | { |
| 306 | unsigned int old, oldt; |
| 307 | |
| 308 | oldt = uatomic_read((unsigned int *)addr); |
| 309 | do { |
| 310 | old = oldt; |
| 311 | oldt = _uatomic_cmpxchg(addr, old, old & val, 4); |
| 312 | } while (oldt != old); |
| 313 | |
| 314 | return; |
| 315 | } |
| 316 | #if (CAA_BITS_PER_LONG == 64) |
| 317 | case 8: |
| 318 | { |
| 319 | unsigned long old, oldt; |
| 320 | |
| 321 | oldt = uatomic_read((unsigned long *)addr); |
| 322 | do { |
| 323 | old = oldt; |
| 324 | oldt = _uatomic_cmpxchg(addr, old, old & val, 8); |
| 325 | } while (oldt != old); |
| 326 | |
| 327 | return; |
| 328 | } |
| 329 | #endif |
| 330 | } |
| 331 | _uatomic_link_error(); |
| 332 | } |
| 333 | |
| 334 | #define uatomic_and(addr, v) \ |
| 335 | (_uatomic_and((addr), \ |
| 336 | caa_cast_long_keep_sign(v), \ |
| 337 | sizeof(*(addr)))) |
| 338 | #define cmm_smp_mb__before_and() cmm_barrier() |
| 339 | #define cmm_smp_mb__after_and() cmm_barrier() |
| 340 | |
| 341 | #endif /* #ifndef uatomic_and */ |
| 342 | |
| 343 | #ifndef uatomic_or |
| 344 | /* uatomic_or */ |
| 345 | |
| 346 | static inline __attribute__((always_inline)) |
| 347 | void _uatomic_or(void *addr, unsigned long val, int len) |
| 348 | { |
| 349 | switch (len) { |
| 350 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
| 351 | case 1: |
| 352 | { |
| 353 | unsigned char old, oldt; |
| 354 | |
| 355 | oldt = uatomic_read((unsigned char *)addr); |
| 356 | do { |
| 357 | old = oldt; |
| 358 | oldt = _uatomic_cmpxchg(addr, old, old | val, 1); |
| 359 | } while (oldt != old); |
| 360 | |
| 361 | return; |
| 362 | } |
| 363 | #endif |
| 364 | #ifdef UATOMIC_HAS_ATOMIC_SHORT |
| 365 | case 2: |
| 366 | { |
| 367 | unsigned short old, oldt; |
| 368 | |
| 369 | oldt = uatomic_read((unsigned short *)addr); |
| 370 | do { |
| 371 | old = oldt; |
| 372 | oldt = _uatomic_cmpxchg(addr, old, old | val, 2); |
| 373 | } while (oldt != old); |
| 374 | |
| 375 | return; |
| 376 | } |
| 377 | #endif |
| 378 | case 4: |
| 379 | { |
| 380 | unsigned int old, oldt; |
| 381 | |
| 382 | oldt = uatomic_read((unsigned int *)addr); |
| 383 | do { |
| 384 | old = oldt; |
| 385 | oldt = _uatomic_cmpxchg(addr, old, old | val, 4); |
| 386 | } while (oldt != old); |
| 387 | |
| 388 | return; |
| 389 | } |
| 390 | #if (CAA_BITS_PER_LONG == 64) |
| 391 | case 8: |
| 392 | { |
| 393 | unsigned long old, oldt; |
| 394 | |
| 395 | oldt = uatomic_read((unsigned long *)addr); |
| 396 | do { |
| 397 | old = oldt; |
| 398 | oldt = _uatomic_cmpxchg(addr, old, old | val, 8); |
| 399 | } while (oldt != old); |
| 400 | |
| 401 | return; |
| 402 | } |
| 403 | #endif |
| 404 | } |
| 405 | _uatomic_link_error(); |
| 406 | } |
| 407 | |
| 408 | #define uatomic_or(addr, v) \ |
| 409 | (_uatomic_or((addr), \ |
| 410 | caa_cast_long_keep_sign(v), \ |
| 411 | sizeof(*(addr)))) |
| 412 | #define cmm_smp_mb__before_or() cmm_barrier() |
| 413 | #define cmm_smp_mb__after_or() cmm_barrier() |
| 414 | |
| 415 | #endif /* #ifndef uatomic_or */ |
| 416 | |
| 417 | #ifndef uatomic_add_return |
| 418 | /* uatomic_add_return */ |
| 419 | |
| 420 | static inline __attribute__((always_inline)) |
| 421 | unsigned long _uatomic_add_return(void *addr, unsigned long val, int len) |
| 422 | { |
| 423 | switch (len) { |
| 424 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
| 425 | case 1: |
| 426 | { |
| 427 | unsigned char old, oldt; |
| 428 | |
| 429 | oldt = uatomic_read((unsigned char *)addr); |
| 430 | do { |
| 431 | old = oldt; |
| 432 | oldt = uatomic_cmpxchg((unsigned char *)addr, |
| 433 | old, old + val); |
| 434 | } while (oldt != old); |
| 435 | |
| 436 | return old + val; |
| 437 | } |
| 438 | #endif |
| 439 | #ifdef UATOMIC_HAS_ATOMIC_SHORT |
| 440 | case 2: |
| 441 | { |
| 442 | unsigned short old, oldt; |
| 443 | |
| 444 | oldt = uatomic_read((unsigned short *)addr); |
| 445 | do { |
| 446 | old = oldt; |
| 447 | oldt = uatomic_cmpxchg((unsigned short *)addr, |
| 448 | old, old + val); |
| 449 | } while (oldt != old); |
| 450 | |
| 451 | return old + val; |
| 452 | } |
| 453 | #endif |
| 454 | case 4: |
| 455 | { |
| 456 | unsigned int old, oldt; |
| 457 | |
| 458 | oldt = uatomic_read((unsigned int *)addr); |
| 459 | do { |
| 460 | old = oldt; |
| 461 | oldt = uatomic_cmpxchg((unsigned int *)addr, |
| 462 | old, old + val); |
| 463 | } while (oldt != old); |
| 464 | |
| 465 | return old + val; |
| 466 | } |
| 467 | #if (CAA_BITS_PER_LONG == 64) |
| 468 | case 8: |
| 469 | { |
| 470 | unsigned long old, oldt; |
| 471 | |
| 472 | oldt = uatomic_read((unsigned long *)addr); |
| 473 | do { |
| 474 | old = oldt; |
| 475 | oldt = uatomic_cmpxchg((unsigned long *)addr, |
| 476 | old, old + val); |
| 477 | } while (oldt != old); |
| 478 | |
| 479 | return old + val; |
| 480 | } |
| 481 | #endif |
| 482 | } |
| 483 | _uatomic_link_error(); |
| 484 | return 0; |
| 485 | } |
| 486 | |
| 487 | #define uatomic_add_return(addr, v) \ |
| 488 | ((__typeof__(*(addr))) _uatomic_add_return((addr), \ |
| 489 | caa_cast_long_keep_sign(v), \ |
| 490 | sizeof(*(addr)))) |
| 491 | #endif /* #ifndef uatomic_add_return */ |
| 492 | |
| 493 | #ifndef uatomic_xchg |
| 494 | /* xchg */ |
| 495 | |
| 496 | static inline __attribute__((always_inline)) |
| 497 | unsigned long _uatomic_exchange(void *addr, unsigned long val, int len) |
| 498 | { |
| 499 | switch (len) { |
| 500 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
| 501 | case 1: |
| 502 | { |
| 503 | unsigned char old, oldt; |
| 504 | |
| 505 | oldt = uatomic_read((unsigned char *)addr); |
| 506 | do { |
| 507 | old = oldt; |
| 508 | oldt = uatomic_cmpxchg((unsigned char *)addr, |
| 509 | old, val); |
| 510 | } while (oldt != old); |
| 511 | |
| 512 | return old; |
| 513 | } |
| 514 | #endif |
| 515 | #ifdef UATOMIC_HAS_ATOMIC_SHORT |
| 516 | case 2: |
| 517 | { |
| 518 | unsigned short old, oldt; |
| 519 | |
| 520 | oldt = uatomic_read((unsigned short *)addr); |
| 521 | do { |
| 522 | old = oldt; |
| 523 | oldt = uatomic_cmpxchg((unsigned short *)addr, |
| 524 | old, val); |
| 525 | } while (oldt != old); |
| 526 | |
| 527 | return old; |
| 528 | } |
| 529 | #endif |
| 530 | case 4: |
| 531 | { |
| 532 | unsigned int old, oldt; |
| 533 | |
| 534 | oldt = uatomic_read((unsigned int *)addr); |
| 535 | do { |
| 536 | old = oldt; |
| 537 | oldt = uatomic_cmpxchg((unsigned int *)addr, |
| 538 | old, val); |
| 539 | } while (oldt != old); |
| 540 | |
| 541 | return old; |
| 542 | } |
| 543 | #if (CAA_BITS_PER_LONG == 64) |
| 544 | case 8: |
| 545 | { |
| 546 | unsigned long old, oldt; |
| 547 | |
| 548 | oldt = uatomic_read((unsigned long *)addr); |
| 549 | do { |
| 550 | old = oldt; |
| 551 | oldt = uatomic_cmpxchg((unsigned long *)addr, |
| 552 | old, val); |
| 553 | } while (oldt != old); |
| 554 | |
| 555 | return old; |
| 556 | } |
| 557 | #endif |
| 558 | } |
| 559 | _uatomic_link_error(); |
| 560 | return 0; |
| 561 | } |
| 562 | |
| 563 | #define uatomic_xchg(addr, v) \ |
| 564 | ((__typeof__(*(addr))) _uatomic_exchange((addr), \ |
| 565 | caa_cast_long_keep_sign(v), \ |
| 566 | sizeof(*(addr)))) |
| 567 | #endif /* #ifndef uatomic_xchg */ |
| 568 | |
| 569 | #endif /* #else #ifndef uatomic_cmpxchg */ |
| 570 | |
| 571 | /* uatomic_sub_return, uatomic_add, uatomic_sub, uatomic_inc, uatomic_dec */ |
| 572 | |
| 573 | #ifndef uatomic_add |
| 574 | #define uatomic_add(addr, v) (void)uatomic_add_return((addr), (v)) |
| 575 | #define cmm_smp_mb__before_add() cmm_barrier() |
| 576 | #define cmm_smp_mb__after_add() cmm_barrier() |
| 577 | #endif |
| 578 | |
| 579 | #define uatomic_sub_return(addr, v) \ |
| 580 | uatomic_add_return((addr), -(caa_cast_long_keep_sign(v))) |
| 581 | #define uatomic_sub(addr, v) \ |
| 582 | uatomic_add((addr), -(caa_cast_long_keep_sign(v))) |
| 583 | #define cmm_smp_mb__before_sub() cmm_smp_mb__before_add() |
| 584 | #define cmm_smp_mb__after_sub() cmm_smp_mb__after_add() |
| 585 | |
| 586 | #ifndef uatomic_inc |
| 587 | #define uatomic_inc(addr) uatomic_add((addr), 1) |
| 588 | #define cmm_smp_mb__before_inc() cmm_smp_mb__before_add() |
| 589 | #define cmm_smp_mb__after_inc() cmm_smp_mb__after_add() |
| 590 | #endif |
| 591 | |
| 592 | #ifndef uatomic_dec |
| 593 | #define uatomic_dec(addr) uatomic_add((addr), -1) |
| 594 | #define cmm_smp_mb__before_dec() cmm_smp_mb__before_add() |
| 595 | #define cmm_smp_mb__after_dec() cmm_smp_mb__after_add() |
| 596 | #endif |
| 597 | |
| 598 | #ifdef __cplusplus |
| 599 | } |
| 600 | #endif |
| 601 | |
| 602 | #endif /* _URCU_UATOMIC_GENERIC_H */ |