| 1 | // SPDX-FileCopyrightText: 1991-1994 by Xerox Corporation. All rights reserved. |
| 2 | // SPDX-FileCopyrightText: 1996-1999 by Silicon Graphics. All rights reserved. |
| 3 | // SPDX-FileCopyrightText: 1999-2004 Hewlett-Packard Development Company, L.P. |
| 4 | // SPDX-FileCopyrightText: 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 5 | // SPDX-FileCopyrightText: 2010 Paolo Bonzini |
| 6 | // |
| 7 | // SPDX-License-Identifier: LicenseRef-Boehm-GC |
| 8 | |
| 9 | #ifndef _URCU_UATOMIC_GENERIC_H |
| 10 | #define _URCU_UATOMIC_GENERIC_H |
| 11 | |
| 12 | /* |
| 13 | * Code inspired from libuatomic_ops-1.2, inherited in part from the |
| 14 | * Boehm-Demers-Weiser conservative garbage collector. |
| 15 | */ |
| 16 | |
| 17 | #include <stdint.h> |
| 18 | #include <stdlib.h> |
| 19 | #include <urcu/compiler.h> |
| 20 | #include <urcu/system.h> |
| 21 | |
| 22 | #ifdef __cplusplus |
| 23 | extern "C" { |
| 24 | #endif |
| 25 | |
| 26 | #ifndef uatomic_set |
| 27 | #define uatomic_set(addr, v) ((void) CMM_STORE_SHARED(*(addr), (v))) |
| 28 | #endif |
| 29 | |
| 30 | #define uatomic_load_store_return_op(op, addr, v, mo) \ |
| 31 | __extension__ \ |
| 32 | ({ \ |
| 33 | \ |
| 34 | switch (mo) { \ |
| 35 | case CMM_ACQUIRE: \ |
| 36 | case CMM_CONSUME: \ |
| 37 | case CMM_RELAXED: \ |
| 38 | break; \ |
| 39 | case CMM_RELEASE: \ |
| 40 | case CMM_ACQ_REL: \ |
| 41 | case CMM_SEQ_CST: \ |
| 42 | case CMM_SEQ_CST_FENCE: \ |
| 43 | cmm_smp_mb(); \ |
| 44 | break; \ |
| 45 | default: \ |
| 46 | abort(); \ |
| 47 | } \ |
| 48 | \ |
| 49 | __typeof__((*addr)) _value = op(addr, v); \ |
| 50 | \ |
| 51 | switch (mo) { \ |
| 52 | case CMM_CONSUME: \ |
| 53 | cmm_smp_read_barrier_depends(); \ |
| 54 | break; \ |
| 55 | case CMM_ACQUIRE: \ |
| 56 | case CMM_ACQ_REL: \ |
| 57 | case CMM_SEQ_CST: \ |
| 58 | case CMM_SEQ_CST_FENCE: \ |
| 59 | cmm_smp_mb(); \ |
| 60 | break; \ |
| 61 | case CMM_RELAXED: \ |
| 62 | case CMM_RELEASE: \ |
| 63 | break; \ |
| 64 | default: \ |
| 65 | abort(); \ |
| 66 | } \ |
| 67 | _value; \ |
| 68 | }) |
| 69 | |
| 70 | #define uatomic_load_store_op(op, addr, v, mo) \ |
| 71 | do { \ |
| 72 | switch (mo) { \ |
| 73 | case CMM_ACQUIRE: \ |
| 74 | case CMM_CONSUME: \ |
| 75 | case CMM_RELAXED: \ |
| 76 | break; \ |
| 77 | case CMM_RELEASE: \ |
| 78 | case CMM_ACQ_REL: \ |
| 79 | case CMM_SEQ_CST: \ |
| 80 | case CMM_SEQ_CST_FENCE: \ |
| 81 | cmm_smp_mb(); \ |
| 82 | break; \ |
| 83 | default: \ |
| 84 | abort(); \ |
| 85 | } \ |
| 86 | \ |
| 87 | op(addr, v); \ |
| 88 | \ |
| 89 | switch (mo) { \ |
| 90 | case CMM_CONSUME: \ |
| 91 | cmm_smp_read_barrier_depends(); \ |
| 92 | break; \ |
| 93 | case CMM_ACQUIRE: \ |
| 94 | case CMM_ACQ_REL: \ |
| 95 | case CMM_SEQ_CST: \ |
| 96 | case CMM_SEQ_CST_FENCE: \ |
| 97 | cmm_smp_mb(); \ |
| 98 | break; \ |
| 99 | case CMM_RELAXED: \ |
| 100 | case CMM_RELEASE: \ |
| 101 | break; \ |
| 102 | default: \ |
| 103 | abort(); \ |
| 104 | } \ |
| 105 | } while (0) |
| 106 | |
| 107 | #define uatomic_store(addr, v, mo) \ |
| 108 | do { \ |
| 109 | switch (mo) { \ |
| 110 | case CMM_RELAXED: \ |
| 111 | break; \ |
| 112 | case CMM_RELEASE: \ |
| 113 | case CMM_SEQ_CST: \ |
| 114 | case CMM_SEQ_CST_FENCE: \ |
| 115 | cmm_smp_mb(); \ |
| 116 | break; \ |
| 117 | default: \ |
| 118 | abort(); \ |
| 119 | } \ |
| 120 | \ |
| 121 | uatomic_set(addr, v); \ |
| 122 | \ |
| 123 | switch (mo) { \ |
| 124 | case CMM_RELAXED: \ |
| 125 | case CMM_RELEASE: \ |
| 126 | break; \ |
| 127 | case CMM_SEQ_CST: \ |
| 128 | case CMM_SEQ_CST_FENCE: \ |
| 129 | cmm_smp_mb(); \ |
| 130 | break; \ |
| 131 | default: \ |
| 132 | abort(); \ |
| 133 | } \ |
| 134 | } while (0) |
| 135 | |
| 136 | #define uatomic_and_mo(addr, v, mo) \ |
| 137 | uatomic_load_store_op(uatomic_and, addr, v, mo) |
| 138 | |
| 139 | #define uatomic_or_mo(addr, v, mo) \ |
| 140 | uatomic_load_store_op(uatomic_or, addr, v, mo) |
| 141 | |
| 142 | #define uatomic_add_mo(addr, v, mo) \ |
| 143 | uatomic_load_store_op(uatomic_add, addr, v, mo) |
| 144 | |
| 145 | #define uatomic_sub_mo(addr, v, mo) \ |
| 146 | uatomic_load_store_op(uatomic_sub, addr, v, mo) |
| 147 | |
| 148 | #define uatomic_inc_mo(addr, mo) \ |
| 149 | uatomic_load_store_op(uatomic_add, addr, 1, mo) |
| 150 | |
| 151 | #define uatomic_dec_mo(addr, mo) \ |
| 152 | uatomic_load_store_op(uatomic_add, addr, -1, mo) |
| 153 | /* |
| 154 | * NOTE: We can not just do switch (_value == (old) ? mos : mof) otherwise the |
| 155 | * compiler emit a -Wduplicated-cond warning. |
| 156 | */ |
| 157 | #define uatomic_cmpxchg_mo(addr, old, new, mos, mof) \ |
| 158 | __extension__ \ |
| 159 | ({ \ |
| 160 | switch (mos) { \ |
| 161 | case CMM_ACQUIRE: \ |
| 162 | case CMM_CONSUME: \ |
| 163 | case CMM_RELAXED: \ |
| 164 | break; \ |
| 165 | case CMM_RELEASE: \ |
| 166 | case CMM_ACQ_REL: \ |
| 167 | case CMM_SEQ_CST: \ |
| 168 | case CMM_SEQ_CST_FENCE: \ |
| 169 | cmm_smp_mb(); \ |
| 170 | break; \ |
| 171 | default: \ |
| 172 | abort(); \ |
| 173 | } \ |
| 174 | \ |
| 175 | __typeof__(*(addr)) _value = uatomic_cmpxchg(addr, old, \ |
| 176 | new); \ |
| 177 | \ |
| 178 | if (_value == (old)) { \ |
| 179 | switch (mos) { \ |
| 180 | case CMM_CONSUME: \ |
| 181 | cmm_smp_read_barrier_depends(); \ |
| 182 | break; \ |
| 183 | case CMM_ACQUIRE: \ |
| 184 | case CMM_ACQ_REL: \ |
| 185 | case CMM_SEQ_CST: \ |
| 186 | case CMM_SEQ_CST_FENCE: \ |
| 187 | cmm_smp_mb(); \ |
| 188 | break; \ |
| 189 | case CMM_RELAXED: \ |
| 190 | case CMM_RELEASE: \ |
| 191 | break; \ |
| 192 | default: \ |
| 193 | abort(); \ |
| 194 | } \ |
| 195 | } else { \ |
| 196 | switch (mof) { \ |
| 197 | case CMM_CONSUME: \ |
| 198 | cmm_smp_read_barrier_depends(); \ |
| 199 | break; \ |
| 200 | case CMM_ACQUIRE: \ |
| 201 | case CMM_ACQ_REL: \ |
| 202 | case CMM_SEQ_CST: \ |
| 203 | case CMM_SEQ_CST_FENCE: \ |
| 204 | cmm_smp_mb(); \ |
| 205 | break; \ |
| 206 | case CMM_RELAXED: \ |
| 207 | case CMM_RELEASE: \ |
| 208 | break; \ |
| 209 | default: \ |
| 210 | abort(); \ |
| 211 | } \ |
| 212 | } \ |
| 213 | _value; \ |
| 214 | }) |
| 215 | |
| 216 | #define uatomic_xchg_mo(addr, v, mo) \ |
| 217 | uatomic_load_store_return_op(uatomic_xchg, addr, v, mo) |
| 218 | |
| 219 | #define uatomic_add_return_mo(addr, v, mo) \ |
| 220 | uatomic_load_store_return_op(uatomic_add_return, addr, v) |
| 221 | |
| 222 | #define uatomic_sub_return_mo(addr, v, mo) \ |
| 223 | uatomic_load_store_return_op(uatomic_sub_return, addr, v) |
| 224 | |
| 225 | |
| 226 | #ifndef uatomic_read |
| 227 | #define uatomic_read(addr) CMM_LOAD_SHARED(*(addr)) |
| 228 | #endif |
| 229 | |
| 230 | #define uatomic_load(addr, mo) \ |
| 231 | __extension__ \ |
| 232 | ({ \ |
| 233 | switch (mo) { \ |
| 234 | case CMM_ACQUIRE: \ |
| 235 | case CMM_CONSUME: \ |
| 236 | case CMM_RELAXED: \ |
| 237 | break; \ |
| 238 | case CMM_SEQ_CST: \ |
| 239 | case CMM_SEQ_CST_FENCE: \ |
| 240 | cmm_smp_mb(); \ |
| 241 | break; \ |
| 242 | default: \ |
| 243 | abort(); \ |
| 244 | } \ |
| 245 | \ |
| 246 | __typeof__(*(addr)) _rcu_value = uatomic_read(addr); \ |
| 247 | \ |
| 248 | switch (mo) { \ |
| 249 | case CMM_RELAXED: \ |
| 250 | break; \ |
| 251 | case CMM_CONSUME: \ |
| 252 | cmm_smp_read_barrier_depends(); \ |
| 253 | break; \ |
| 254 | case CMM_ACQUIRE: \ |
| 255 | case CMM_SEQ_CST: \ |
| 256 | case CMM_SEQ_CST_FENCE: \ |
| 257 | cmm_smp_mb(); \ |
| 258 | break; \ |
| 259 | default: \ |
| 260 | abort(); \ |
| 261 | } \ |
| 262 | \ |
| 263 | _rcu_value; \ |
| 264 | }) |
| 265 | |
| 266 | #if !defined __OPTIMIZE__ || defined UATOMIC_NO_LINK_ERROR |
| 267 | #ifdef ILLEGAL_INSTR |
| 268 | static inline __attribute__((always_inline)) |
| 269 | void _uatomic_link_error(void) |
| 270 | { |
| 271 | /* |
| 272 | * generate an illegal instruction. Cannot catch this with |
| 273 | * linker tricks when optimizations are disabled. |
| 274 | */ |
| 275 | __asm__ __volatile__(ILLEGAL_INSTR); |
| 276 | } |
| 277 | #else |
| 278 | static inline __attribute__((always_inline, __noreturn__)) |
| 279 | void _uatomic_link_error(void) |
| 280 | { |
| 281 | __builtin_trap(); |
| 282 | } |
| 283 | #endif |
| 284 | |
| 285 | #else /* #if !defined __OPTIMIZE__ || defined UATOMIC_NO_LINK_ERROR */ |
| 286 | extern void _uatomic_link_error(void); |
| 287 | #endif /* #else #if !defined __OPTIMIZE__ || defined UATOMIC_NO_LINK_ERROR */ |
| 288 | |
| 289 | /* cmpxchg */ |
| 290 | |
| 291 | #ifndef uatomic_cmpxchg |
| 292 | static inline __attribute__((always_inline)) |
| 293 | unsigned long _uatomic_cmpxchg(void *addr, unsigned long old, |
| 294 | unsigned long _new, int len) |
| 295 | { |
| 296 | switch (len) { |
| 297 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
| 298 | case 1: |
| 299 | return __sync_val_compare_and_swap_1((uint8_t *) addr, old, |
| 300 | _new); |
| 301 | #endif |
| 302 | #ifdef UATOMIC_HAS_ATOMIC_SHORT |
| 303 | case 2: |
| 304 | return __sync_val_compare_and_swap_2((uint16_t *) addr, old, |
| 305 | _new); |
| 306 | #endif |
| 307 | case 4: |
| 308 | return __sync_val_compare_and_swap_4((uint32_t *) addr, old, |
| 309 | _new); |
| 310 | #if (CAA_BITS_PER_LONG == 64) |
| 311 | case 8: |
| 312 | return __sync_val_compare_and_swap_8((uint64_t *) addr, old, |
| 313 | _new); |
| 314 | #endif |
| 315 | } |
| 316 | _uatomic_link_error(); |
| 317 | return 0; |
| 318 | } |
| 319 | |
| 320 | |
| 321 | #define uatomic_cmpxchg(addr, old, _new) \ |
| 322 | ((__typeof__(*(addr))) _uatomic_cmpxchg((addr), \ |
| 323 | caa_cast_long_keep_sign(old), \ |
| 324 | caa_cast_long_keep_sign(_new),\ |
| 325 | sizeof(*(addr)))) |
| 326 | |
| 327 | |
| 328 | /* uatomic_and */ |
| 329 | |
| 330 | #ifndef uatomic_and |
| 331 | static inline __attribute__((always_inline)) |
| 332 | void _uatomic_and(void *addr, unsigned long val, |
| 333 | int len) |
| 334 | { |
| 335 | switch (len) { |
| 336 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
| 337 | case 1: |
| 338 | __sync_and_and_fetch_1((uint8_t *) addr, val); |
| 339 | return; |
| 340 | #endif |
| 341 | #ifdef UATOMIC_HAS_ATOMIC_SHORT |
| 342 | case 2: |
| 343 | __sync_and_and_fetch_2((uint16_t *) addr, val); |
| 344 | return; |
| 345 | #endif |
| 346 | case 4: |
| 347 | __sync_and_and_fetch_4((uint32_t *) addr, val); |
| 348 | return; |
| 349 | #if (CAA_BITS_PER_LONG == 64) |
| 350 | case 8: |
| 351 | __sync_and_and_fetch_8((uint64_t *) addr, val); |
| 352 | return; |
| 353 | #endif |
| 354 | } |
| 355 | _uatomic_link_error(); |
| 356 | } |
| 357 | |
| 358 | #define uatomic_and(addr, v) \ |
| 359 | (_uatomic_and((addr), \ |
| 360 | caa_cast_long_keep_sign(v), \ |
| 361 | sizeof(*(addr)))) |
| 362 | #define cmm_smp_mb__before_uatomic_and() cmm_barrier() |
| 363 | #define cmm_smp_mb__after_uatomic_and() cmm_barrier() |
| 364 | |
| 365 | #endif |
| 366 | |
| 367 | /* uatomic_or */ |
| 368 | |
| 369 | #ifndef uatomic_or |
| 370 | static inline __attribute__((always_inline)) |
| 371 | void _uatomic_or(void *addr, unsigned long val, |
| 372 | int len) |
| 373 | { |
| 374 | switch (len) { |
| 375 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
| 376 | case 1: |
| 377 | __sync_or_and_fetch_1((uint8_t *) addr, val); |
| 378 | return; |
| 379 | #endif |
| 380 | #ifdef UATOMIC_HAS_ATOMIC_SHORT |
| 381 | case 2: |
| 382 | __sync_or_and_fetch_2((uint16_t *) addr, val); |
| 383 | return; |
| 384 | #endif |
| 385 | case 4: |
| 386 | __sync_or_and_fetch_4((uint32_t *) addr, val); |
| 387 | return; |
| 388 | #if (CAA_BITS_PER_LONG == 64) |
| 389 | case 8: |
| 390 | __sync_or_and_fetch_8((uint64_t *) addr, val); |
| 391 | return; |
| 392 | #endif |
| 393 | } |
| 394 | _uatomic_link_error(); |
| 395 | return; |
| 396 | } |
| 397 | |
| 398 | #define uatomic_or(addr, v) \ |
| 399 | (_uatomic_or((addr), \ |
| 400 | caa_cast_long_keep_sign(v), \ |
| 401 | sizeof(*(addr)))) |
| 402 | #define cmm_smp_mb__before_uatomic_or() cmm_barrier() |
| 403 | #define cmm_smp_mb__after_uatomic_or() cmm_barrier() |
| 404 | |
| 405 | #endif |
| 406 | |
| 407 | |
| 408 | /* uatomic_add_return */ |
| 409 | |
| 410 | #ifndef uatomic_add_return |
| 411 | static inline __attribute__((always_inline)) |
| 412 | unsigned long _uatomic_add_return(void *addr, unsigned long val, |
| 413 | int len) |
| 414 | { |
| 415 | switch (len) { |
| 416 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
| 417 | case 1: |
| 418 | return __sync_add_and_fetch_1((uint8_t *) addr, val); |
| 419 | #endif |
| 420 | #ifdef UATOMIC_HAS_ATOMIC_SHORT |
| 421 | case 2: |
| 422 | return __sync_add_and_fetch_2((uint16_t *) addr, val); |
| 423 | #endif |
| 424 | case 4: |
| 425 | return __sync_add_and_fetch_4((uint32_t *) addr, val); |
| 426 | #if (CAA_BITS_PER_LONG == 64) |
| 427 | case 8: |
| 428 | return __sync_add_and_fetch_8((uint64_t *) addr, val); |
| 429 | #endif |
| 430 | } |
| 431 | _uatomic_link_error(); |
| 432 | return 0; |
| 433 | } |
| 434 | |
| 435 | |
| 436 | #define uatomic_add_return(addr, v) \ |
| 437 | ((__typeof__(*(addr))) _uatomic_add_return((addr), \ |
| 438 | caa_cast_long_keep_sign(v), \ |
| 439 | sizeof(*(addr)))) |
| 440 | #endif /* #ifndef uatomic_add_return */ |
| 441 | |
| 442 | #ifndef uatomic_xchg |
| 443 | /* xchg */ |
| 444 | |
| 445 | static inline __attribute__((always_inline)) |
| 446 | unsigned long _uatomic_exchange(void *addr, unsigned long val, int len) |
| 447 | { |
| 448 | switch (len) { |
| 449 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
| 450 | case 1: |
| 451 | { |
| 452 | uint8_t old; |
| 453 | |
| 454 | do { |
| 455 | old = uatomic_read((uint8_t *) addr); |
| 456 | } while (!__sync_bool_compare_and_swap_1((uint8_t *) addr, |
| 457 | old, val)); |
| 458 | |
| 459 | return old; |
| 460 | } |
| 461 | #endif |
| 462 | #ifdef UATOMIC_HAS_ATOMIC_SHORT |
| 463 | case 2: |
| 464 | { |
| 465 | uint16_t old; |
| 466 | |
| 467 | do { |
| 468 | old = uatomic_read((uint16_t *) addr); |
| 469 | } while (!__sync_bool_compare_and_swap_2((uint16_t *) addr, |
| 470 | old, val)); |
| 471 | |
| 472 | return old; |
| 473 | } |
| 474 | #endif |
| 475 | case 4: |
| 476 | { |
| 477 | uint32_t old; |
| 478 | |
| 479 | do { |
| 480 | old = uatomic_read((uint32_t *) addr); |
| 481 | } while (!__sync_bool_compare_and_swap_4((uint32_t *) addr, |
| 482 | old, val)); |
| 483 | |
| 484 | return old; |
| 485 | } |
| 486 | #if (CAA_BITS_PER_LONG == 64) |
| 487 | case 8: |
| 488 | { |
| 489 | uint64_t old; |
| 490 | |
| 491 | do { |
| 492 | old = uatomic_read((uint64_t *) addr); |
| 493 | } while (!__sync_bool_compare_and_swap_8((uint64_t *) addr, |
| 494 | old, val)); |
| 495 | |
| 496 | return old; |
| 497 | } |
| 498 | #endif |
| 499 | } |
| 500 | _uatomic_link_error(); |
| 501 | return 0; |
| 502 | } |
| 503 | |
| 504 | #define uatomic_xchg(addr, v) \ |
| 505 | ((__typeof__(*(addr))) _uatomic_exchange((addr), \ |
| 506 | caa_cast_long_keep_sign(v), \ |
| 507 | sizeof(*(addr)))) |
| 508 | #endif /* #ifndef uatomic_xchg */ |
| 509 | |
| 510 | #else /* #ifndef uatomic_cmpxchg */ |
| 511 | |
| 512 | #ifndef uatomic_and |
| 513 | /* uatomic_and */ |
| 514 | |
| 515 | static inline __attribute__((always_inline)) |
| 516 | void _uatomic_and(void *addr, unsigned long val, int len) |
| 517 | { |
| 518 | switch (len) { |
| 519 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
| 520 | case 1: |
| 521 | { |
| 522 | uint8_t old, oldt; |
| 523 | |
| 524 | oldt = uatomic_read((uint8_t *) addr); |
| 525 | do { |
| 526 | old = oldt; |
| 527 | oldt = _uatomic_cmpxchg(addr, old, old & val, 1); |
| 528 | } while (oldt != old); |
| 529 | |
| 530 | return; |
| 531 | } |
| 532 | #endif |
| 533 | #ifdef UATOMIC_HAS_ATOMIC_SHORT |
| 534 | case 2: |
| 535 | { |
| 536 | uint16_t old, oldt; |
| 537 | |
| 538 | oldt = uatomic_read((uint16_t *) addr); |
| 539 | do { |
| 540 | old = oldt; |
| 541 | oldt = _uatomic_cmpxchg(addr, old, old & val, 2); |
| 542 | } while (oldt != old); |
| 543 | } |
| 544 | #endif |
| 545 | case 4: |
| 546 | { |
| 547 | uint32_t old, oldt; |
| 548 | |
| 549 | oldt = uatomic_read((uint32_t *) addr); |
| 550 | do { |
| 551 | old = oldt; |
| 552 | oldt = _uatomic_cmpxchg(addr, old, old & val, 4); |
| 553 | } while (oldt != old); |
| 554 | |
| 555 | return; |
| 556 | } |
| 557 | #if (CAA_BITS_PER_LONG == 64) |
| 558 | case 8: |
| 559 | { |
| 560 | uint64_t old, oldt; |
| 561 | |
| 562 | oldt = uatomic_read((uint64_t *) addr); |
| 563 | do { |
| 564 | old = oldt; |
| 565 | oldt = _uatomic_cmpxchg(addr, old, old & val, 8); |
| 566 | } while (oldt != old); |
| 567 | |
| 568 | return; |
| 569 | } |
| 570 | #endif |
| 571 | } |
| 572 | _uatomic_link_error(); |
| 573 | } |
| 574 | |
| 575 | #define uatomic_and(addr, v) \ |
| 576 | (_uatomic_and((addr), \ |
| 577 | caa_cast_long_keep_sign(v), \ |
| 578 | sizeof(*(addr)))) |
| 579 | #define cmm_smp_mb__before_uatomic_and() cmm_barrier() |
| 580 | #define cmm_smp_mb__after_uatomic_and() cmm_barrier() |
| 581 | |
| 582 | #endif /* #ifndef uatomic_and */ |
| 583 | |
| 584 | #ifndef uatomic_or |
| 585 | /* uatomic_or */ |
| 586 | |
| 587 | static inline __attribute__((always_inline)) |
| 588 | void _uatomic_or(void *addr, unsigned long val, int len) |
| 589 | { |
| 590 | switch (len) { |
| 591 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
| 592 | case 1: |
| 593 | { |
| 594 | uint8_t old, oldt; |
| 595 | |
| 596 | oldt = uatomic_read((uint8_t *) addr); |
| 597 | do { |
| 598 | old = oldt; |
| 599 | oldt = _uatomic_cmpxchg(addr, old, old | val, 1); |
| 600 | } while (oldt != old); |
| 601 | |
| 602 | return; |
| 603 | } |
| 604 | #endif |
| 605 | #ifdef UATOMIC_HAS_ATOMIC_SHORT |
| 606 | case 2: |
| 607 | { |
| 608 | uint16_t old, oldt; |
| 609 | |
| 610 | oldt = uatomic_read((uint16_t *) addr); |
| 611 | do { |
| 612 | old = oldt; |
| 613 | oldt = _uatomic_cmpxchg(addr, old, old | val, 2); |
| 614 | } while (oldt != old); |
| 615 | |
| 616 | return; |
| 617 | } |
| 618 | #endif |
| 619 | case 4: |
| 620 | { |
| 621 | uint32_t old, oldt; |
| 622 | |
| 623 | oldt = uatomic_read((uint32_t *) addr); |
| 624 | do { |
| 625 | old = oldt; |
| 626 | oldt = _uatomic_cmpxchg(addr, old, old | val, 4); |
| 627 | } while (oldt != old); |
| 628 | |
| 629 | return; |
| 630 | } |
| 631 | #if (CAA_BITS_PER_LONG == 64) |
| 632 | case 8: |
| 633 | { |
| 634 | uint64_t old, oldt; |
| 635 | |
| 636 | oldt = uatomic_read((uint64_t *) addr); |
| 637 | do { |
| 638 | old = oldt; |
| 639 | oldt = _uatomic_cmpxchg(addr, old, old | val, 8); |
| 640 | } while (oldt != old); |
| 641 | |
| 642 | return; |
| 643 | } |
| 644 | #endif |
| 645 | } |
| 646 | _uatomic_link_error(); |
| 647 | } |
| 648 | |
| 649 | #define uatomic_or(addr, v) \ |
| 650 | (_uatomic_or((addr), \ |
| 651 | caa_cast_long_keep_sign(v), \ |
| 652 | sizeof(*(addr)))) |
| 653 | #define cmm_smp_mb__before_uatomic_or() cmm_barrier() |
| 654 | #define cmm_smp_mb__after_uatomic_or() cmm_barrier() |
| 655 | |
| 656 | #endif /* #ifndef uatomic_or */ |
| 657 | |
| 658 | #ifndef uatomic_add_return |
| 659 | /* uatomic_add_return */ |
| 660 | |
| 661 | static inline __attribute__((always_inline)) |
| 662 | unsigned long _uatomic_add_return(void *addr, unsigned long val, int len) |
| 663 | { |
| 664 | switch (len) { |
| 665 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
| 666 | case 1: |
| 667 | { |
| 668 | uint8_t old, oldt; |
| 669 | |
| 670 | oldt = uatomic_read((uint8_t *) addr); |
| 671 | do { |
| 672 | old = oldt; |
| 673 | oldt = uatomic_cmpxchg((uint8_t *) addr, |
| 674 | old, old + val); |
| 675 | } while (oldt != old); |
| 676 | |
| 677 | return old + val; |
| 678 | } |
| 679 | #endif |
| 680 | #ifdef UATOMIC_HAS_ATOMIC_SHORT |
| 681 | case 2: |
| 682 | { |
| 683 | uint16_t old, oldt; |
| 684 | |
| 685 | oldt = uatomic_read((uint16_t *) addr); |
| 686 | do { |
| 687 | old = oldt; |
| 688 | oldt = uatomic_cmpxchg((uint16_t *) addr, |
| 689 | old, old + val); |
| 690 | } while (oldt != old); |
| 691 | |
| 692 | return old + val; |
| 693 | } |
| 694 | #endif |
| 695 | case 4: |
| 696 | { |
| 697 | uint32_t old, oldt; |
| 698 | |
| 699 | oldt = uatomic_read((uint32_t *) addr); |
| 700 | do { |
| 701 | old = oldt; |
| 702 | oldt = uatomic_cmpxchg((uint32_t *) addr, |
| 703 | old, old + val); |
| 704 | } while (oldt != old); |
| 705 | |
| 706 | return old + val; |
| 707 | } |
| 708 | #if (CAA_BITS_PER_LONG == 64) |
| 709 | case 8: |
| 710 | { |
| 711 | uint64_t old, oldt; |
| 712 | |
| 713 | oldt = uatomic_read((uint64_t *) addr); |
| 714 | do { |
| 715 | old = oldt; |
| 716 | oldt = uatomic_cmpxchg((uint64_t *) addr, |
| 717 | old, old + val); |
| 718 | } while (oldt != old); |
| 719 | |
| 720 | return old + val; |
| 721 | } |
| 722 | #endif |
| 723 | } |
| 724 | _uatomic_link_error(); |
| 725 | return 0; |
| 726 | } |
| 727 | |
| 728 | #define uatomic_add_return(addr, v) \ |
| 729 | ((__typeof__(*(addr))) _uatomic_add_return((addr), \ |
| 730 | caa_cast_long_keep_sign(v), \ |
| 731 | sizeof(*(addr)))) |
| 732 | #endif /* #ifndef uatomic_add_return */ |
| 733 | |
| 734 | #ifndef uatomic_xchg |
| 735 | /* xchg */ |
| 736 | |
| 737 | static inline __attribute__((always_inline)) |
| 738 | unsigned long _uatomic_exchange(void *addr, unsigned long val, int len) |
| 739 | { |
| 740 | switch (len) { |
| 741 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
| 742 | case 1: |
| 743 | { |
| 744 | uint8_t old, oldt; |
| 745 | |
| 746 | oldt = uatomic_read((uint8_t *) addr); |
| 747 | do { |
| 748 | old = oldt; |
| 749 | oldt = uatomic_cmpxchg((uint8_t *) addr, |
| 750 | old, val); |
| 751 | } while (oldt != old); |
| 752 | |
| 753 | return old; |
| 754 | } |
| 755 | #endif |
| 756 | #ifdef UATOMIC_HAS_ATOMIC_SHORT |
| 757 | case 2: |
| 758 | { |
| 759 | uint16_t old, oldt; |
| 760 | |
| 761 | oldt = uatomic_read((uint16_t *) addr); |
| 762 | do { |
| 763 | old = oldt; |
| 764 | oldt = uatomic_cmpxchg((uint16_t *) addr, |
| 765 | old, val); |
| 766 | } while (oldt != old); |
| 767 | |
| 768 | return old; |
| 769 | } |
| 770 | #endif |
| 771 | case 4: |
| 772 | { |
| 773 | uint32_t old, oldt; |
| 774 | |
| 775 | oldt = uatomic_read((uint32_t *) addr); |
| 776 | do { |
| 777 | old = oldt; |
| 778 | oldt = uatomic_cmpxchg((uint32_t *) addr, |
| 779 | old, val); |
| 780 | } while (oldt != old); |
| 781 | |
| 782 | return old; |
| 783 | } |
| 784 | #if (CAA_BITS_PER_LONG == 64) |
| 785 | case 8: |
| 786 | { |
| 787 | uint64_t old, oldt; |
| 788 | |
| 789 | oldt = uatomic_read((uint64_t *) addr); |
| 790 | do { |
| 791 | old = oldt; |
| 792 | oldt = uatomic_cmpxchg((uint64_t *) addr, |
| 793 | old, val); |
| 794 | } while (oldt != old); |
| 795 | |
| 796 | return old; |
| 797 | } |
| 798 | #endif |
| 799 | } |
| 800 | _uatomic_link_error(); |
| 801 | return 0; |
| 802 | } |
| 803 | |
| 804 | #define uatomic_xchg(addr, v) \ |
| 805 | ((__typeof__(*(addr))) _uatomic_exchange((addr), \ |
| 806 | caa_cast_long_keep_sign(v), \ |
| 807 | sizeof(*(addr)))) |
| 808 | #endif /* #ifndef uatomic_xchg */ |
| 809 | |
| 810 | #endif /* #else #ifndef uatomic_cmpxchg */ |
| 811 | |
| 812 | /* uatomic_sub_return, uatomic_add, uatomic_sub, uatomic_inc, uatomic_dec */ |
| 813 | |
| 814 | #ifndef uatomic_add |
| 815 | #define uatomic_add(addr, v) (void)uatomic_add_return((addr), (v)) |
| 816 | #define cmm_smp_mb__before_uatomic_add() cmm_barrier() |
| 817 | #define cmm_smp_mb__after_uatomic_add() cmm_barrier() |
| 818 | #endif |
| 819 | |
| 820 | #define uatomic_sub_return(addr, v) \ |
| 821 | uatomic_add_return((addr), -(caa_cast_long_keep_sign(v))) |
| 822 | #define uatomic_sub(addr, v) \ |
| 823 | uatomic_add((addr), -(caa_cast_long_keep_sign(v))) |
| 824 | #define cmm_smp_mb__before_uatomic_sub() cmm_smp_mb__before_uatomic_add() |
| 825 | #define cmm_smp_mb__after_uatomic_sub() cmm_smp_mb__after_uatomic_add() |
| 826 | |
| 827 | #ifndef uatomic_inc |
| 828 | #define uatomic_inc(addr) uatomic_add((addr), 1) |
| 829 | #define cmm_smp_mb__before_uatomic_inc() cmm_smp_mb__before_uatomic_add() |
| 830 | #define cmm_smp_mb__after_uatomic_inc() cmm_smp_mb__after_uatomic_add() |
| 831 | #endif |
| 832 | |
| 833 | #ifndef uatomic_dec |
| 834 | #define uatomic_dec(addr) uatomic_add((addr), -1) |
| 835 | #define cmm_smp_mb__before_uatomic_dec() cmm_smp_mb__before_uatomic_add() |
| 836 | #define cmm_smp_mb__after_uatomic_dec() cmm_smp_mb__after_uatomic_add() |
| 837 | #endif |
| 838 | |
| 839 | #ifdef __cplusplus |
| 840 | } |
| 841 | #endif |
| 842 | |
| 843 | #endif /* _URCU_UATOMIC_GENERIC_H */ |