| 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 <urcu/compiler.h> |
| 19 | #include <urcu/system.h> |
| 20 | |
| 21 | #ifdef __cplusplus |
| 22 | extern "C" { |
| 23 | #endif |
| 24 | |
| 25 | #ifndef uatomic_set |
| 26 | #define uatomic_set(addr, v) ((void) CMM_STORE_SHARED(*(addr), (v))) |
| 27 | #endif |
| 28 | |
| 29 | /* |
| 30 | * Can be defined for the architecture. |
| 31 | * |
| 32 | * What needs to be emitted _before_ the `operation' with memory ordering `mo'. |
| 33 | */ |
| 34 | #ifndef _cmm_compat_c11_smp_mb__before_mo |
| 35 | # define _cmm_compat_c11_smp_mb__before_mo(operation, mo) cmm_smp_mb() |
| 36 | #endif |
| 37 | |
| 38 | /* |
| 39 | * Can be defined for the architecture. |
| 40 | * |
| 41 | * What needs to be emitted _after_ the `operation' with memory ordering `mo'. |
| 42 | */ |
| 43 | #ifndef _cmm_compat_c11_smp_mb__after_mo |
| 44 | # define _cmm_compat_c11_smp_mb__after_mo(operation, mo) cmm_smp_mb() |
| 45 | #endif |
| 46 | |
| 47 | #define uatomic_load_store_return_op(op, addr, v, mo) \ |
| 48 | __extension__ \ |
| 49 | ({ \ |
| 50 | _cmm_compat_c11_smp_mb__before_mo(op, mo); \ |
| 51 | __typeof__((*addr)) _value = op(addr, v); \ |
| 52 | _cmm_compat_c11_smp_mb__after_mo(op, mo); \ |
| 53 | \ |
| 54 | _value; \ |
| 55 | }) |
| 56 | |
| 57 | #define uatomic_load_store_op(op, addr, v, mo) \ |
| 58 | do { \ |
| 59 | _cmm_compat_c11_smp_mb__before_mo(op, mo); \ |
| 60 | op(addr, v); \ |
| 61 | _cmm_compat_c11_smp_mb__after_mo(op, mo); \ |
| 62 | } while (0) |
| 63 | |
| 64 | #define uatomic_store(addr, v, mo) \ |
| 65 | do { \ |
| 66 | _cmm_compat_c11_smp_mb__before_mo(uatomic_set, mo); \ |
| 67 | uatomic_set(addr, v); \ |
| 68 | _cmm_compat_c11_smp_mb__after_mo(uatomic_set, mo); \ |
| 69 | } while (0) |
| 70 | |
| 71 | #define uatomic_and_mo(addr, v, mo) \ |
| 72 | uatomic_load_store_op(uatomic_and, addr, v, mo) |
| 73 | |
| 74 | #define uatomic_or_mo(addr, v, mo) \ |
| 75 | uatomic_load_store_op(uatomic_or, addr, v, mo) |
| 76 | |
| 77 | #define uatomic_add_mo(addr, v, mo) \ |
| 78 | uatomic_load_store_op(uatomic_add, addr, v, mo) |
| 79 | |
| 80 | #define uatomic_sub_mo(addr, v, mo) \ |
| 81 | uatomic_load_store_op(uatomic_sub, addr, v, mo) |
| 82 | |
| 83 | #define uatomic_inc_mo(addr, mo) \ |
| 84 | uatomic_load_store_op(uatomic_add, addr, 1, mo) |
| 85 | |
| 86 | #define uatomic_dec_mo(addr, mo) \ |
| 87 | uatomic_load_store_op(uatomic_add, addr, -1, mo) |
| 88 | /* |
| 89 | * NOTE: We can not just do switch (_value == (old) ? mos : mof) otherwise the |
| 90 | * compiler emit a -Wduplicated-cond warning. |
| 91 | */ |
| 92 | #define uatomic_cmpxchg_mo(addr, old, new, mos, mof) \ |
| 93 | __extension__ \ |
| 94 | ({ \ |
| 95 | _cmm_compat_c11_smp_mb__before_mo(uatomic_cmpxchg, mos); \ |
| 96 | __typeof__(*(addr)) _value = uatomic_cmpxchg(addr, old, \ |
| 97 | new); \ |
| 98 | \ |
| 99 | if (_value == (old)) { \ |
| 100 | _cmm_compat_c11_smp_mb__after_mo(uatomic_cmpxchg, mos); \ |
| 101 | } else { \ |
| 102 | _cmm_compat_c11_smp_mb__after_mo(uatomic_cmpxchg, mof); \ |
| 103 | } \ |
| 104 | _value; \ |
| 105 | }) |
| 106 | |
| 107 | #define uatomic_xchg_mo(addr, v, mo) \ |
| 108 | uatomic_load_store_return_op(uatomic_xchg, addr, v, mo) |
| 109 | |
| 110 | #define uatomic_add_return_mo(addr, v, mo) \ |
| 111 | uatomic_load_store_return_op(uatomic_add_return, addr, v) |
| 112 | |
| 113 | #define uatomic_sub_return_mo(addr, v, mo) \ |
| 114 | uatomic_load_store_return_op(uatomic_sub_return, addr, v) |
| 115 | |
| 116 | #ifndef uatomic_read |
| 117 | #define uatomic_read(addr) CMM_LOAD_SHARED(*(addr)) |
| 118 | #endif |
| 119 | |
| 120 | #define uatomic_load(addr, mo) \ |
| 121 | __extension__ \ |
| 122 | ({ \ |
| 123 | _cmm_compat_c11_smp_mb__before_mo(uatomic_read, mo); \ |
| 124 | __typeof__(*(addr)) _rcu_value = uatomic_read(addr); \ |
| 125 | _cmm_compat_c11_smp_mb__after_mo(uatomic_read, mo); \ |
| 126 | \ |
| 127 | _rcu_value; \ |
| 128 | }) |
| 129 | |
| 130 | #if !defined __OPTIMIZE__ || defined UATOMIC_NO_LINK_ERROR |
| 131 | #ifdef ILLEGAL_INSTR |
| 132 | static inline __attribute__((always_inline)) |
| 133 | void _uatomic_link_error(void) |
| 134 | { |
| 135 | /* |
| 136 | * generate an illegal instruction. Cannot catch this with |
| 137 | * linker tricks when optimizations are disabled. |
| 138 | */ |
| 139 | __asm__ __volatile__(ILLEGAL_INSTR); |
| 140 | } |
| 141 | #else |
| 142 | static inline __attribute__((always_inline, __noreturn__)) |
| 143 | void _uatomic_link_error(void) |
| 144 | { |
| 145 | __builtin_trap(); |
| 146 | } |
| 147 | #endif |
| 148 | |
| 149 | #else /* #if !defined __OPTIMIZE__ || defined UATOMIC_NO_LINK_ERROR */ |
| 150 | extern void _uatomic_link_error(void); |
| 151 | #endif /* #else #if !defined __OPTIMIZE__ || defined UATOMIC_NO_LINK_ERROR */ |
| 152 | |
| 153 | /* cmpxchg */ |
| 154 | |
| 155 | #ifndef uatomic_cmpxchg |
| 156 | static inline __attribute__((always_inline)) |
| 157 | unsigned long _uatomic_cmpxchg(void *addr, unsigned long old, |
| 158 | unsigned long _new, int len) |
| 159 | { |
| 160 | switch (len) { |
| 161 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
| 162 | case 1: |
| 163 | return __sync_val_compare_and_swap_1((uint8_t *) addr, old, |
| 164 | _new); |
| 165 | #endif |
| 166 | #ifdef UATOMIC_HAS_ATOMIC_SHORT |
| 167 | case 2: |
| 168 | return __sync_val_compare_and_swap_2((uint16_t *) addr, old, |
| 169 | _new); |
| 170 | #endif |
| 171 | case 4: |
| 172 | return __sync_val_compare_and_swap_4((uint32_t *) addr, old, |
| 173 | _new); |
| 174 | #if (CAA_BITS_PER_LONG == 64) |
| 175 | case 8: |
| 176 | return __sync_val_compare_and_swap_8((uint64_t *) addr, old, |
| 177 | _new); |
| 178 | #endif |
| 179 | } |
| 180 | _uatomic_link_error(); |
| 181 | return 0; |
| 182 | } |
| 183 | |
| 184 | |
| 185 | #define uatomic_cmpxchg(addr, old, _new) \ |
| 186 | ((__typeof__(*(addr))) _uatomic_cmpxchg((addr), \ |
| 187 | caa_cast_long_keep_sign(old), \ |
| 188 | caa_cast_long_keep_sign(_new),\ |
| 189 | sizeof(*(addr)))) |
| 190 | |
| 191 | |
| 192 | /* uatomic_and */ |
| 193 | |
| 194 | #ifndef uatomic_and |
| 195 | static inline __attribute__((always_inline)) |
| 196 | void _uatomic_and(void *addr, unsigned long val, |
| 197 | int len) |
| 198 | { |
| 199 | switch (len) { |
| 200 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
| 201 | case 1: |
| 202 | __sync_and_and_fetch_1((uint8_t *) addr, val); |
| 203 | return; |
| 204 | #endif |
| 205 | #ifdef UATOMIC_HAS_ATOMIC_SHORT |
| 206 | case 2: |
| 207 | __sync_and_and_fetch_2((uint16_t *) addr, val); |
| 208 | return; |
| 209 | #endif |
| 210 | case 4: |
| 211 | __sync_and_and_fetch_4((uint32_t *) addr, val); |
| 212 | return; |
| 213 | #if (CAA_BITS_PER_LONG == 64) |
| 214 | case 8: |
| 215 | __sync_and_and_fetch_8((uint64_t *) addr, val); |
| 216 | return; |
| 217 | #endif |
| 218 | } |
| 219 | _uatomic_link_error(); |
| 220 | } |
| 221 | |
| 222 | #define uatomic_and(addr, v) \ |
| 223 | (_uatomic_and((addr), \ |
| 224 | caa_cast_long_keep_sign(v), \ |
| 225 | sizeof(*(addr)))) |
| 226 | #define cmm_smp_mb__before_uatomic_and() cmm_barrier() |
| 227 | #define cmm_smp_mb__after_uatomic_and() cmm_barrier() |
| 228 | |
| 229 | #endif |
| 230 | |
| 231 | /* uatomic_or */ |
| 232 | |
| 233 | #ifndef uatomic_or |
| 234 | static inline __attribute__((always_inline)) |
| 235 | void _uatomic_or(void *addr, unsigned long val, |
| 236 | int len) |
| 237 | { |
| 238 | switch (len) { |
| 239 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
| 240 | case 1: |
| 241 | __sync_or_and_fetch_1((uint8_t *) addr, val); |
| 242 | return; |
| 243 | #endif |
| 244 | #ifdef UATOMIC_HAS_ATOMIC_SHORT |
| 245 | case 2: |
| 246 | __sync_or_and_fetch_2((uint16_t *) addr, val); |
| 247 | return; |
| 248 | #endif |
| 249 | case 4: |
| 250 | __sync_or_and_fetch_4((uint32_t *) addr, val); |
| 251 | return; |
| 252 | #if (CAA_BITS_PER_LONG == 64) |
| 253 | case 8: |
| 254 | __sync_or_and_fetch_8((uint64_t *) addr, val); |
| 255 | return; |
| 256 | #endif |
| 257 | } |
| 258 | _uatomic_link_error(); |
| 259 | return; |
| 260 | } |
| 261 | |
| 262 | #define uatomic_or(addr, v) \ |
| 263 | (_uatomic_or((addr), \ |
| 264 | caa_cast_long_keep_sign(v), \ |
| 265 | sizeof(*(addr)))) |
| 266 | #define cmm_smp_mb__before_uatomic_or() cmm_barrier() |
| 267 | #define cmm_smp_mb__after_uatomic_or() cmm_barrier() |
| 268 | |
| 269 | #endif |
| 270 | |
| 271 | |
| 272 | /* uatomic_add_return */ |
| 273 | |
| 274 | #ifndef uatomic_add_return |
| 275 | static inline __attribute__((always_inline)) |
| 276 | unsigned long _uatomic_add_return(void *addr, unsigned long val, |
| 277 | int len) |
| 278 | { |
| 279 | switch (len) { |
| 280 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
| 281 | case 1: |
| 282 | return __sync_add_and_fetch_1((uint8_t *) addr, val); |
| 283 | #endif |
| 284 | #ifdef UATOMIC_HAS_ATOMIC_SHORT |
| 285 | case 2: |
| 286 | return __sync_add_and_fetch_2((uint16_t *) addr, val); |
| 287 | #endif |
| 288 | case 4: |
| 289 | return __sync_add_and_fetch_4((uint32_t *) addr, val); |
| 290 | #if (CAA_BITS_PER_LONG == 64) |
| 291 | case 8: |
| 292 | return __sync_add_and_fetch_8((uint64_t *) addr, val); |
| 293 | #endif |
| 294 | } |
| 295 | _uatomic_link_error(); |
| 296 | return 0; |
| 297 | } |
| 298 | |
| 299 | |
| 300 | #define uatomic_add_return(addr, v) \ |
| 301 | ((__typeof__(*(addr))) _uatomic_add_return((addr), \ |
| 302 | caa_cast_long_keep_sign(v), \ |
| 303 | sizeof(*(addr)))) |
| 304 | #endif /* #ifndef uatomic_add_return */ |
| 305 | |
| 306 | #ifndef uatomic_xchg |
| 307 | /* xchg */ |
| 308 | |
| 309 | static inline __attribute__((always_inline)) |
| 310 | unsigned long _uatomic_exchange(void *addr, unsigned long val, int len) |
| 311 | { |
| 312 | switch (len) { |
| 313 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
| 314 | case 1: |
| 315 | { |
| 316 | uint8_t old; |
| 317 | |
| 318 | do { |
| 319 | old = uatomic_read((uint8_t *) addr); |
| 320 | } while (!__sync_bool_compare_and_swap_1((uint8_t *) addr, |
| 321 | old, val)); |
| 322 | |
| 323 | return old; |
| 324 | } |
| 325 | #endif |
| 326 | #ifdef UATOMIC_HAS_ATOMIC_SHORT |
| 327 | case 2: |
| 328 | { |
| 329 | uint16_t old; |
| 330 | |
| 331 | do { |
| 332 | old = uatomic_read((uint16_t *) addr); |
| 333 | } while (!__sync_bool_compare_and_swap_2((uint16_t *) addr, |
| 334 | old, val)); |
| 335 | |
| 336 | return old; |
| 337 | } |
| 338 | #endif |
| 339 | case 4: |
| 340 | { |
| 341 | uint32_t old; |
| 342 | |
| 343 | do { |
| 344 | old = uatomic_read((uint32_t *) addr); |
| 345 | } while (!__sync_bool_compare_and_swap_4((uint32_t *) addr, |
| 346 | old, val)); |
| 347 | |
| 348 | return old; |
| 349 | } |
| 350 | #if (CAA_BITS_PER_LONG == 64) |
| 351 | case 8: |
| 352 | { |
| 353 | uint64_t old; |
| 354 | |
| 355 | do { |
| 356 | old = uatomic_read((uint64_t *) addr); |
| 357 | } while (!__sync_bool_compare_and_swap_8((uint64_t *) addr, |
| 358 | old, val)); |
| 359 | |
| 360 | return old; |
| 361 | } |
| 362 | #endif |
| 363 | } |
| 364 | _uatomic_link_error(); |
| 365 | return 0; |
| 366 | } |
| 367 | |
| 368 | #define uatomic_xchg(addr, v) \ |
| 369 | ((__typeof__(*(addr))) _uatomic_exchange((addr), \ |
| 370 | caa_cast_long_keep_sign(v), \ |
| 371 | sizeof(*(addr)))) |
| 372 | #endif /* #ifndef uatomic_xchg */ |
| 373 | |
| 374 | #else /* #ifndef uatomic_cmpxchg */ |
| 375 | |
| 376 | #ifndef uatomic_and |
| 377 | /* uatomic_and */ |
| 378 | |
| 379 | static inline __attribute__((always_inline)) |
| 380 | void _uatomic_and(void *addr, unsigned long val, int len) |
| 381 | { |
| 382 | switch (len) { |
| 383 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
| 384 | case 1: |
| 385 | { |
| 386 | uint8_t old, oldt; |
| 387 | |
| 388 | oldt = uatomic_read((uint8_t *) addr); |
| 389 | do { |
| 390 | old = oldt; |
| 391 | oldt = _uatomic_cmpxchg(addr, old, old & val, 1); |
| 392 | } while (oldt != old); |
| 393 | |
| 394 | return; |
| 395 | } |
| 396 | #endif |
| 397 | #ifdef UATOMIC_HAS_ATOMIC_SHORT |
| 398 | case 2: |
| 399 | { |
| 400 | uint16_t old, oldt; |
| 401 | |
| 402 | oldt = uatomic_read((uint16_t *) addr); |
| 403 | do { |
| 404 | old = oldt; |
| 405 | oldt = _uatomic_cmpxchg(addr, old, old & val, 2); |
| 406 | } while (oldt != old); |
| 407 | } |
| 408 | #endif |
| 409 | case 4: |
| 410 | { |
| 411 | uint32_t old, oldt; |
| 412 | |
| 413 | oldt = uatomic_read((uint32_t *) addr); |
| 414 | do { |
| 415 | old = oldt; |
| 416 | oldt = _uatomic_cmpxchg(addr, old, old & val, 4); |
| 417 | } while (oldt != old); |
| 418 | |
| 419 | return; |
| 420 | } |
| 421 | #if (CAA_BITS_PER_LONG == 64) |
| 422 | case 8: |
| 423 | { |
| 424 | uint64_t old, oldt; |
| 425 | |
| 426 | oldt = uatomic_read((uint64_t *) addr); |
| 427 | do { |
| 428 | old = oldt; |
| 429 | oldt = _uatomic_cmpxchg(addr, old, old & val, 8); |
| 430 | } while (oldt != old); |
| 431 | |
| 432 | return; |
| 433 | } |
| 434 | #endif |
| 435 | } |
| 436 | _uatomic_link_error(); |
| 437 | } |
| 438 | |
| 439 | #define uatomic_and(addr, v) \ |
| 440 | (_uatomic_and((addr), \ |
| 441 | caa_cast_long_keep_sign(v), \ |
| 442 | sizeof(*(addr)))) |
| 443 | #define cmm_smp_mb__before_uatomic_and() cmm_barrier() |
| 444 | #define cmm_smp_mb__after_uatomic_and() cmm_barrier() |
| 445 | |
| 446 | #endif /* #ifndef uatomic_and */ |
| 447 | |
| 448 | #ifndef uatomic_or |
| 449 | /* uatomic_or */ |
| 450 | |
| 451 | static inline __attribute__((always_inline)) |
| 452 | void _uatomic_or(void *addr, unsigned long val, int len) |
| 453 | { |
| 454 | switch (len) { |
| 455 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
| 456 | case 1: |
| 457 | { |
| 458 | uint8_t old, oldt; |
| 459 | |
| 460 | oldt = uatomic_read((uint8_t *) addr); |
| 461 | do { |
| 462 | old = oldt; |
| 463 | oldt = _uatomic_cmpxchg(addr, old, old | val, 1); |
| 464 | } while (oldt != old); |
| 465 | |
| 466 | return; |
| 467 | } |
| 468 | #endif |
| 469 | #ifdef UATOMIC_HAS_ATOMIC_SHORT |
| 470 | case 2: |
| 471 | { |
| 472 | uint16_t old, oldt; |
| 473 | |
| 474 | oldt = uatomic_read((uint16_t *) addr); |
| 475 | do { |
| 476 | old = oldt; |
| 477 | oldt = _uatomic_cmpxchg(addr, old, old | val, 2); |
| 478 | } while (oldt != old); |
| 479 | |
| 480 | return; |
| 481 | } |
| 482 | #endif |
| 483 | case 4: |
| 484 | { |
| 485 | uint32_t old, oldt; |
| 486 | |
| 487 | oldt = uatomic_read((uint32_t *) addr); |
| 488 | do { |
| 489 | old = oldt; |
| 490 | oldt = _uatomic_cmpxchg(addr, old, old | val, 4); |
| 491 | } while (oldt != old); |
| 492 | |
| 493 | return; |
| 494 | } |
| 495 | #if (CAA_BITS_PER_LONG == 64) |
| 496 | case 8: |
| 497 | { |
| 498 | uint64_t old, oldt; |
| 499 | |
| 500 | oldt = uatomic_read((uint64_t *) addr); |
| 501 | do { |
| 502 | old = oldt; |
| 503 | oldt = _uatomic_cmpxchg(addr, old, old | val, 8); |
| 504 | } while (oldt != old); |
| 505 | |
| 506 | return; |
| 507 | } |
| 508 | #endif |
| 509 | } |
| 510 | _uatomic_link_error(); |
| 511 | } |
| 512 | |
| 513 | #define uatomic_or(addr, v) \ |
| 514 | (_uatomic_or((addr), \ |
| 515 | caa_cast_long_keep_sign(v), \ |
| 516 | sizeof(*(addr)))) |
| 517 | #define cmm_smp_mb__before_uatomic_or() cmm_barrier() |
| 518 | #define cmm_smp_mb__after_uatomic_or() cmm_barrier() |
| 519 | |
| 520 | #endif /* #ifndef uatomic_or */ |
| 521 | |
| 522 | #ifndef uatomic_add_return |
| 523 | /* uatomic_add_return */ |
| 524 | |
| 525 | static inline __attribute__((always_inline)) |
| 526 | unsigned long _uatomic_add_return(void *addr, unsigned long val, int len) |
| 527 | { |
| 528 | switch (len) { |
| 529 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
| 530 | case 1: |
| 531 | { |
| 532 | uint8_t old, oldt; |
| 533 | |
| 534 | oldt = uatomic_read((uint8_t *) addr); |
| 535 | do { |
| 536 | old = oldt; |
| 537 | oldt = uatomic_cmpxchg((uint8_t *) addr, |
| 538 | old, old + val); |
| 539 | } while (oldt != old); |
| 540 | |
| 541 | return old + val; |
| 542 | } |
| 543 | #endif |
| 544 | #ifdef UATOMIC_HAS_ATOMIC_SHORT |
| 545 | case 2: |
| 546 | { |
| 547 | uint16_t old, oldt; |
| 548 | |
| 549 | oldt = uatomic_read((uint16_t *) addr); |
| 550 | do { |
| 551 | old = oldt; |
| 552 | oldt = uatomic_cmpxchg((uint16_t *) addr, |
| 553 | old, old + val); |
| 554 | } while (oldt != old); |
| 555 | |
| 556 | return old + val; |
| 557 | } |
| 558 | #endif |
| 559 | case 4: |
| 560 | { |
| 561 | uint32_t old, oldt; |
| 562 | |
| 563 | oldt = uatomic_read((uint32_t *) addr); |
| 564 | do { |
| 565 | old = oldt; |
| 566 | oldt = uatomic_cmpxchg((uint32_t *) addr, |
| 567 | old, old + val); |
| 568 | } while (oldt != old); |
| 569 | |
| 570 | return old + val; |
| 571 | } |
| 572 | #if (CAA_BITS_PER_LONG == 64) |
| 573 | case 8: |
| 574 | { |
| 575 | uint64_t old, oldt; |
| 576 | |
| 577 | oldt = uatomic_read((uint64_t *) addr); |
| 578 | do { |
| 579 | old = oldt; |
| 580 | oldt = uatomic_cmpxchg((uint64_t *) addr, |
| 581 | old, old + val); |
| 582 | } while (oldt != old); |
| 583 | |
| 584 | return old + val; |
| 585 | } |
| 586 | #endif |
| 587 | } |
| 588 | _uatomic_link_error(); |
| 589 | return 0; |
| 590 | } |
| 591 | |
| 592 | #define uatomic_add_return(addr, v) \ |
| 593 | ((__typeof__(*(addr))) _uatomic_add_return((addr), \ |
| 594 | caa_cast_long_keep_sign(v), \ |
| 595 | sizeof(*(addr)))) |
| 596 | #endif /* #ifndef uatomic_add_return */ |
| 597 | |
| 598 | #ifndef uatomic_xchg |
| 599 | /* xchg */ |
| 600 | |
| 601 | static inline __attribute__((always_inline)) |
| 602 | unsigned long _uatomic_exchange(void *addr, unsigned long val, int len) |
| 603 | { |
| 604 | switch (len) { |
| 605 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
| 606 | case 1: |
| 607 | { |
| 608 | uint8_t old, oldt; |
| 609 | |
| 610 | oldt = uatomic_read((uint8_t *) addr); |
| 611 | do { |
| 612 | old = oldt; |
| 613 | oldt = uatomic_cmpxchg((uint8_t *) addr, |
| 614 | old, val); |
| 615 | } while (oldt != old); |
| 616 | |
| 617 | return old; |
| 618 | } |
| 619 | #endif |
| 620 | #ifdef UATOMIC_HAS_ATOMIC_SHORT |
| 621 | case 2: |
| 622 | { |
| 623 | uint16_t old, oldt; |
| 624 | |
| 625 | oldt = uatomic_read((uint16_t *) addr); |
| 626 | do { |
| 627 | old = oldt; |
| 628 | oldt = uatomic_cmpxchg((uint16_t *) addr, |
| 629 | old, val); |
| 630 | } while (oldt != old); |
| 631 | |
| 632 | return old; |
| 633 | } |
| 634 | #endif |
| 635 | case 4: |
| 636 | { |
| 637 | uint32_t old, oldt; |
| 638 | |
| 639 | oldt = uatomic_read((uint32_t *) addr); |
| 640 | do { |
| 641 | old = oldt; |
| 642 | oldt = uatomic_cmpxchg((uint32_t *) addr, |
| 643 | old, val); |
| 644 | } while (oldt != old); |
| 645 | |
| 646 | return old; |
| 647 | } |
| 648 | #if (CAA_BITS_PER_LONG == 64) |
| 649 | case 8: |
| 650 | { |
| 651 | uint64_t old, oldt; |
| 652 | |
| 653 | oldt = uatomic_read((uint64_t *) addr); |
| 654 | do { |
| 655 | old = oldt; |
| 656 | oldt = uatomic_cmpxchg((uint64_t *) addr, |
| 657 | old, val); |
| 658 | } while (oldt != old); |
| 659 | |
| 660 | return old; |
| 661 | } |
| 662 | #endif |
| 663 | } |
| 664 | _uatomic_link_error(); |
| 665 | return 0; |
| 666 | } |
| 667 | |
| 668 | #define uatomic_xchg(addr, v) \ |
| 669 | ((__typeof__(*(addr))) _uatomic_exchange((addr), \ |
| 670 | caa_cast_long_keep_sign(v), \ |
| 671 | sizeof(*(addr)))) |
| 672 | #endif /* #ifndef uatomic_xchg */ |
| 673 | |
| 674 | #endif /* #else #ifndef uatomic_cmpxchg */ |
| 675 | |
| 676 | /* uatomic_sub_return, uatomic_add, uatomic_sub, uatomic_inc, uatomic_dec */ |
| 677 | |
| 678 | #ifndef uatomic_add |
| 679 | #define uatomic_add(addr, v) (void)uatomic_add_return((addr), (v)) |
| 680 | #define cmm_smp_mb__before_uatomic_add() cmm_barrier() |
| 681 | #define cmm_smp_mb__after_uatomic_add() cmm_barrier() |
| 682 | #endif |
| 683 | |
| 684 | #define uatomic_sub_return(addr, v) \ |
| 685 | uatomic_add_return((addr), -(caa_cast_long_keep_sign(v))) |
| 686 | #define uatomic_sub(addr, v) \ |
| 687 | uatomic_add((addr), -(caa_cast_long_keep_sign(v))) |
| 688 | #define cmm_smp_mb__before_uatomic_sub() cmm_smp_mb__before_uatomic_add() |
| 689 | #define cmm_smp_mb__after_uatomic_sub() cmm_smp_mb__after_uatomic_add() |
| 690 | |
| 691 | #ifndef uatomic_inc |
| 692 | #define uatomic_inc(addr) uatomic_add((addr), 1) |
| 693 | #define cmm_smp_mb__before_uatomic_inc() cmm_smp_mb__before_uatomic_add() |
| 694 | #define cmm_smp_mb__after_uatomic_inc() cmm_smp_mb__after_uatomic_add() |
| 695 | #endif |
| 696 | |
| 697 | #ifndef uatomic_dec |
| 698 | #define uatomic_dec(addr) uatomic_add((addr), -1) |
| 699 | #define cmm_smp_mb__before_uatomic_dec() cmm_smp_mb__before_uatomic_add() |
| 700 | #define cmm_smp_mb__after_uatomic_dec() cmm_smp_mb__after_uatomic_add() |
| 701 | #endif |
| 702 | |
| 703 | #ifdef __cplusplus |
| 704 | } |
| 705 | #endif |
| 706 | |
| 707 | #endif /* _URCU_UATOMIC_GENERIC_H */ |