1 // SPDX-License-Identifier: BSD-2-Clause 2 /* 3 * Copyright (c) 2016-2022, Linaro Limited 4 * Copyright (c) 2014, STMicroelectronics International N.V. 5 * Copyright (c) 2020-2021, Arm Limited 6 */ 7 8 #include <config.h> 9 #include <crypto/crypto.h> 10 #include <kernel/asan.h> 11 #include <kernel/boot.h> 12 #include <kernel/lockdep.h> 13 #include <kernel/misc.h> 14 #include <kernel/panic.h> 15 #include <kernel/spinlock.h> 16 #include <kernel/thread.h> 17 #include <kernel/thread_private.h> 18 #include <mm/mobj.h> 19 20 struct thread_ctx threads[CFG_NUM_THREADS]; 21 22 struct thread_core_local thread_core_local[CFG_TEE_CORE_NB_CORE] __nex_bss; 23 24 /* 25 * Stacks 26 * 27 * [Lower addresses on the left] 28 * 29 * [ STACK_CANARY_SIZE/2 | STACK_CHECK_EXTRA | STACK_XXX_SIZE | STACK_CANARY_SIZE/2 ] 30 * ^ ^ ^ ^ 31 * stack_xxx[n] "hard" top "soft" top bottom 32 */ 33 34 #ifdef CFG_WITH_STACK_CANARIES 35 static uint32_t start_canary_value = 0xdedede00; 36 static uint32_t end_canary_value = 0xababab00; 37 #define GET_START_CANARY(name, stack_num) name[stack_num][0] 38 #define GET_END_CANARY(name, stack_num) \ 39 name[stack_num][sizeof(name[stack_num]) / sizeof(uint32_t) - 1] 40 #endif 41 42 #define DECLARE_STACK(name, num_stacks, stack_size, linkage) \ 43 linkage uint32_t name[num_stacks] \ 44 [ROUNDUP(stack_size + STACK_CANARY_SIZE + STACK_CHECK_EXTRA, \ 45 STACK_ALIGNMENT) / sizeof(uint32_t)] \ 46 __attribute__((section(".nozi_stack." # name), \ 47 aligned(STACK_ALIGNMENT))) 48 49 #define GET_STACK(stack) ((vaddr_t)(stack) + STACK_SIZE(stack)) 50 51 DECLARE_STACK(stack_tmp, CFG_TEE_CORE_NB_CORE, STACK_TMP_SIZE, 52 /* global linkage */); 53 DECLARE_STACK(stack_abt, CFG_TEE_CORE_NB_CORE, STACK_ABT_SIZE, static); 54 #ifndef CFG_WITH_PAGER 55 DECLARE_STACK(stack_thread, CFG_NUM_THREADS, STACK_THREAD_SIZE, static); 56 #endif 57 58 #define GET_STACK_TOP_HARD(stack, n) \ 59 ((vaddr_t)&(stack)[n] + STACK_CANARY_SIZE / 2) 60 #define GET_STACK_TOP_SOFT(stack, n) \ 61 (GET_STACK_TOP_HARD(stack, n) + STACK_CHECK_EXTRA) 62 #define GET_STACK_BOTTOM(stack, n) ((vaddr_t)&(stack)[n] + sizeof(stack[n]) - \ 63 STACK_CANARY_SIZE / 2) 64 65 const uint32_t stack_tmp_stride __section(".identity_map.stack_tmp_stride") = 66 sizeof(stack_tmp[0]); 67 68 /* 69 * This stack setup info is required by secondary boot cores before they 70 * each locally enable the pager (the mmu). Hence kept in pager sections. 71 */ 72 DECLARE_KEEP_PAGER(stack_tmp_stride); 73 74 static unsigned int thread_global_lock __nex_bss = SPINLOCK_UNLOCK; 75 76 void thread_init_canaries(void) 77 { 78 #ifdef CFG_WITH_STACK_CANARIES 79 size_t n; 80 #define INIT_CANARY(name) \ 81 for (n = 0; n < ARRAY_SIZE(name); n++) { \ 82 uint32_t *start_canary = &GET_START_CANARY(name, n); \ 83 uint32_t *end_canary = &GET_END_CANARY(name, n); \ 84 \ 85 *start_canary = start_canary_value; \ 86 *end_canary = end_canary_value; \ 87 } 88 89 INIT_CANARY(stack_tmp); 90 INIT_CANARY(stack_abt); 91 #if !defined(CFG_WITH_PAGER) && !defined(CFG_NS_VIRTUALIZATION) 92 INIT_CANARY(stack_thread); 93 #endif 94 #endif/*CFG_WITH_STACK_CANARIES*/ 95 } 96 97 #if defined(CFG_WITH_STACK_CANARIES) 98 void thread_update_canaries(void) 99 { 100 uint32_t canary[2] = { }; 101 uint32_t exceptions = 0; 102 103 plat_get_random_stack_canaries(canary, ARRAY_SIZE(canary), 104 sizeof(canary[0])); 105 106 exceptions = thread_mask_exceptions(THREAD_EXCP_ALL); 107 108 thread_check_canaries(); 109 110 start_canary_value = canary[0]; 111 end_canary_value = canary[1]; 112 thread_init_canaries(); 113 114 thread_unmask_exceptions(exceptions); 115 } 116 #endif 117 118 #define CANARY_DIED(stack, loc, n, addr) \ 119 do { \ 120 EMSG_RAW("Dead canary at %s of '%s[%zu]' (%p)", #loc, #stack, \ 121 n, (void *)addr); \ 122 panic(); \ 123 } while (0) 124 125 void thread_check_canaries(void) 126 { 127 #ifdef CFG_WITH_STACK_CANARIES 128 uint32_t *canary = NULL; 129 size_t n = 0; 130 131 for (n = 0; n < ARRAY_SIZE(stack_tmp); n++) { 132 canary = &GET_START_CANARY(stack_tmp, n); 133 if (*canary != start_canary_value) 134 CANARY_DIED(stack_tmp, start, n, canary); 135 canary = &GET_END_CANARY(stack_tmp, n); 136 if (*canary != end_canary_value) 137 CANARY_DIED(stack_tmp, end, n, canary); 138 } 139 140 for (n = 0; n < ARRAY_SIZE(stack_abt); n++) { 141 canary = &GET_START_CANARY(stack_abt, n); 142 if (*canary != start_canary_value) 143 CANARY_DIED(stack_abt, start, n, canary); 144 canary = &GET_END_CANARY(stack_abt, n); 145 if (*canary != end_canary_value) 146 CANARY_DIED(stack_abt, end, n, canary); 147 } 148 #if !defined(CFG_WITH_PAGER) && !defined(CFG_NS_VIRTUALIZATION) 149 for (n = 0; n < ARRAY_SIZE(stack_thread); n++) { 150 canary = &GET_START_CANARY(stack_thread, n); 151 if (*canary != start_canary_value) 152 CANARY_DIED(stack_thread, start, n, canary); 153 canary = &GET_END_CANARY(stack_thread, n); 154 if (*canary != end_canary_value) 155 CANARY_DIED(stack_thread, end, n, canary); 156 } 157 #endif 158 #endif/*CFG_WITH_STACK_CANARIES*/ 159 } 160 161 void thread_lock_global(void) 162 { 163 cpu_spin_lock(&thread_global_lock); 164 } 165 166 void thread_unlock_global(void) 167 { 168 cpu_spin_unlock(&thread_global_lock); 169 } 170 171 static struct thread_core_local * __nostackcheck 172 get_core_local(unsigned int pos) 173 { 174 /* 175 * Foreign interrupts must be disabled before playing with core_local 176 * since we otherwise may be rescheduled to a different core in the 177 * middle of this function. 178 */ 179 assert(thread_get_exceptions() & THREAD_EXCP_FOREIGN_INTR); 180 181 assert(pos < CFG_TEE_CORE_NB_CORE); 182 return &thread_core_local[pos]; 183 } 184 185 struct thread_core_local * __nostackcheck thread_get_core_local(void) 186 { 187 unsigned int pos = get_core_pos(); 188 189 return get_core_local(pos); 190 } 191 192 #ifdef CFG_CORE_DEBUG_CHECK_STACKS 193 static void print_stack_limits(void) 194 { 195 size_t n = 0; 196 vaddr_t __maybe_unused start = 0; 197 vaddr_t __maybe_unused end = 0; 198 199 for (n = 0; n < CFG_TEE_CORE_NB_CORE; n++) { 200 start = GET_STACK_TOP_SOFT(stack_tmp, n); 201 end = GET_STACK_BOTTOM(stack_tmp, n); 202 DMSG("tmp [%zu] 0x%" PRIxVA "..0x%" PRIxVA, n, start, end); 203 } 204 for (n = 0; n < CFG_TEE_CORE_NB_CORE; n++) { 205 start = GET_STACK_TOP_SOFT(stack_abt, n); 206 end = GET_STACK_BOTTOM(stack_abt, n); 207 DMSG("abt [%zu] 0x%" PRIxVA "..0x%" PRIxVA, n, start, end); 208 } 209 for (n = 0; n < CFG_NUM_THREADS; n++) { 210 end = threads[n].stack_va_end; 211 start = end - STACK_THREAD_SIZE + STACK_CHECK_EXTRA; 212 DMSG("thr [%zu] 0x%" PRIxVA "..0x%" PRIxVA, n, start, end); 213 } 214 } 215 216 static void check_stack_limits(void) 217 { 218 vaddr_t stack_start = 0; 219 vaddr_t stack_end = 0; 220 /* Any value in the current stack frame will do */ 221 vaddr_t current_sp = (vaddr_t)&stack_start; 222 223 if (!get_stack_soft_limits(&stack_start, &stack_end)) 224 panic("Unknown stack limits"); 225 if (current_sp < stack_start || current_sp > stack_end) { 226 EMSG("Stack pointer out of range: 0x%" PRIxVA " not in [0x%" 227 PRIxVA " .. 0x%" PRIxVA "]", current_sp, stack_start, 228 stack_end); 229 print_stack_limits(); 230 panic(); 231 } 232 } 233 234 static bool * __nostackcheck get_stackcheck_recursion_flag(void) 235 { 236 uint32_t exceptions = thread_mask_exceptions(THREAD_EXCP_FOREIGN_INTR); 237 unsigned int pos = get_core_pos(); 238 struct thread_core_local *l = get_core_local(pos); 239 int ct = l->curr_thread; 240 bool *p = NULL; 241 242 if (l->flags & (THREAD_CLF_ABORT | THREAD_CLF_TMP)) 243 p = &l->stackcheck_recursion; 244 else if (!l->flags) 245 p = &threads[ct].tsd.stackcheck_recursion; 246 247 thread_unmask_exceptions(exceptions); 248 return p; 249 } 250 251 void __cyg_profile_func_enter(void *this_fn, void *call_site); 252 void __nostackcheck __cyg_profile_func_enter(void *this_fn __unused, 253 void *call_site __unused) 254 { 255 bool *p = get_stackcheck_recursion_flag(); 256 257 assert(p); 258 if (*p) 259 return; 260 *p = true; 261 check_stack_limits(); 262 *p = false; 263 } 264 265 void __cyg_profile_func_exit(void *this_fn, void *call_site); 266 void __nostackcheck __cyg_profile_func_exit(void *this_fn __unused, 267 void *call_site __unused) 268 { 269 } 270 #else 271 static void print_stack_limits(void) 272 { 273 } 274 #endif 275 276 void thread_init_boot_thread(void) 277 { 278 struct thread_core_local *l = thread_get_core_local(); 279 280 thread_init_threads(); 281 282 l->curr_thread = 0; 283 threads[0].state = THREAD_STATE_ACTIVE; 284 } 285 286 void __nostackcheck thread_clr_boot_thread(void) 287 { 288 struct thread_core_local *l = thread_get_core_local(); 289 290 assert(l->curr_thread >= 0 && l->curr_thread < CFG_NUM_THREADS); 291 assert(threads[l->curr_thread].state == THREAD_STATE_ACTIVE); 292 threads[l->curr_thread].state = THREAD_STATE_FREE; 293 l->curr_thread = THREAD_ID_INVALID; 294 } 295 296 void __nostackcheck *thread_get_tmp_sp(void) 297 { 298 struct thread_core_local *l = thread_get_core_local(); 299 300 /* 301 * Called from assembly when switching to the temporary stack, so flags 302 * need updating 303 */ 304 l->flags |= THREAD_CLF_TMP; 305 306 return (void *)l->tmp_stack_va_end; 307 } 308 309 vaddr_t thread_stack_start(void) 310 { 311 struct thread_ctx *thr; 312 int ct = thread_get_id_may_fail(); 313 314 if (ct == THREAD_ID_INVALID) 315 return 0; 316 317 thr = threads + ct; 318 return thr->stack_va_end - STACK_THREAD_SIZE; 319 } 320 321 size_t thread_stack_size(void) 322 { 323 return STACK_THREAD_SIZE; 324 } 325 326 bool get_stack_limits(vaddr_t *start, vaddr_t *end, bool hard) 327 { 328 uint32_t exceptions = thread_mask_exceptions(THREAD_EXCP_FOREIGN_INTR); 329 unsigned int pos = get_core_pos(); 330 struct thread_core_local *l = get_core_local(pos); 331 int ct = l->curr_thread; 332 bool ret = false; 333 334 if (l->flags & THREAD_CLF_TMP) { 335 if (hard) 336 *start = GET_STACK_TOP_HARD(stack_tmp, pos); 337 else 338 *start = GET_STACK_TOP_SOFT(stack_tmp, pos); 339 *end = GET_STACK_BOTTOM(stack_tmp, pos); 340 ret = true; 341 } else if (l->flags & THREAD_CLF_ABORT) { 342 if (hard) 343 *start = GET_STACK_TOP_HARD(stack_abt, pos); 344 else 345 *start = GET_STACK_TOP_SOFT(stack_abt, pos); 346 *end = GET_STACK_BOTTOM(stack_abt, pos); 347 ret = true; 348 } else if (!l->flags) { 349 if (ct < 0 || ct >= CFG_NUM_THREADS) 350 goto out; 351 352 *end = threads[ct].stack_va_end; 353 *start = *end - STACK_THREAD_SIZE; 354 if (!hard) 355 *start += STACK_CHECK_EXTRA; 356 ret = true; 357 } 358 out: 359 thread_unmask_exceptions(exceptions); 360 return ret; 361 } 362 363 bool thread_is_from_abort_mode(void) 364 { 365 struct thread_core_local *l = thread_get_core_local(); 366 367 return (l->flags >> THREAD_CLF_SAVED_SHIFT) & THREAD_CLF_ABORT; 368 } 369 370 /* 371 * This function should always be accurate, but it might be possible to 372 * implement a more efficient depending on cpu architecture. 373 */ 374 bool __weak thread_is_in_normal_mode(void) 375 { 376 uint32_t exceptions = thread_mask_exceptions(THREAD_EXCP_FOREIGN_INTR); 377 struct thread_core_local *l = thread_get_core_local(); 378 bool ret; 379 380 /* 381 * If any bit in l->flags is set aside from THREAD_CLF_TMP we're 382 * handling some exception. 383 */ 384 ret = (l->curr_thread != THREAD_ID_INVALID) && 385 !(l->flags & ~THREAD_CLF_TMP); 386 thread_unmask_exceptions(exceptions); 387 388 return ret; 389 } 390 391 short int __noprof thread_get_id_may_fail(void) 392 { 393 /* 394 * thread_get_core_local() requires foreign interrupts to be disabled 395 */ 396 uint32_t exceptions = thread_mask_exceptions(THREAD_EXCP_FOREIGN_INTR); 397 struct thread_core_local *l = thread_get_core_local(); 398 short int ct = l->curr_thread; 399 400 thread_unmask_exceptions(exceptions); 401 return ct; 402 } 403 404 short int __noprof thread_get_id(void) 405 { 406 short int ct = thread_get_id_may_fail(); 407 408 /* Thread ID has to fit in a short int */ 409 COMPILE_TIME_ASSERT(CFG_NUM_THREADS <= SHRT_MAX); 410 assert(ct >= 0 && ct < CFG_NUM_THREADS); 411 return ct; 412 } 413 414 #ifdef CFG_WITH_PAGER 415 static void init_thread_stacks(void) 416 { 417 size_t n = 0; 418 419 /* 420 * Allocate virtual memory for thread stacks. 421 */ 422 for (n = 0; n < CFG_NUM_THREADS; n++) { 423 tee_mm_entry_t *mm = NULL; 424 vaddr_t sp = 0; 425 size_t num_pages = 0; 426 struct fobj *fobj = NULL; 427 428 /* Find vmem for thread stack and its protection gap */ 429 mm = tee_mm_alloc(&core_virt_mem_pool, 430 SMALL_PAGE_SIZE + STACK_THREAD_SIZE); 431 assert(mm); 432 433 /* Claim eventual physical page */ 434 tee_pager_add_pages(tee_mm_get_smem(mm), tee_mm_get_size(mm), 435 true); 436 437 num_pages = tee_mm_get_bytes(mm) / SMALL_PAGE_SIZE - 1; 438 fobj = fobj_locked_paged_alloc(num_pages); 439 440 /* Add the region to the pager */ 441 tee_pager_add_core_region(tee_mm_get_smem(mm) + SMALL_PAGE_SIZE, 442 PAGED_REGION_TYPE_LOCK, fobj); 443 fobj_put(fobj); 444 445 /* init effective stack */ 446 sp = tee_mm_get_smem(mm) + tee_mm_get_bytes(mm); 447 asan_tag_access((void *)tee_mm_get_smem(mm), (void *)sp); 448 threads[n].stack_va_end = sp; 449 } 450 } 451 #else 452 static void init_thread_stacks(void) 453 { 454 size_t n; 455 456 /* Assign the thread stacks */ 457 for (n = 0; n < CFG_NUM_THREADS; n++) 458 threads[n].stack_va_end = GET_STACK_BOTTOM(stack_thread, n); 459 } 460 #endif /*CFG_WITH_PAGER*/ 461 462 void thread_init_threads(void) 463 { 464 size_t n = 0; 465 466 init_thread_stacks(); 467 print_stack_limits(); 468 pgt_init(); 469 470 mutex_lockdep_init(); 471 472 for (n = 0; n < CFG_NUM_THREADS; n++) 473 TAILQ_INIT(&threads[n].tsd.sess_stack); 474 } 475 476 void __nostackcheck thread_init_thread_core_local(void) 477 { 478 size_t n = 0; 479 struct thread_core_local *tcl = thread_core_local; 480 481 for (n = 0; n < CFG_TEE_CORE_NB_CORE; n++) { 482 tcl[n].curr_thread = THREAD_ID_INVALID; 483 tcl[n].flags = THREAD_CLF_TMP; 484 } 485 tcl[0].tmp_stack_va_end = GET_STACK_BOTTOM(stack_tmp, 0); 486 } 487 488 void __nostackcheck thread_init_core_local_stacks(void) 489 { 490 size_t n = 0; 491 struct thread_core_local *tcl = thread_core_local; 492 493 for (n = 0; n < CFG_TEE_CORE_NB_CORE; n++) { 494 tcl[n].tmp_stack_va_end = GET_STACK_BOTTOM(stack_tmp, n) - 495 STACK_TMP_OFFS; 496 tcl[n].abt_stack_va_end = GET_STACK_BOTTOM(stack_abt, n); 497 } 498 } 499 500 #if defined(CFG_CORE_PAUTH) 501 void thread_init_thread_pauth_keys(void) 502 { 503 size_t n = 0; 504 505 for (n = 0; n < CFG_NUM_THREADS; n++) 506 if (crypto_rng_read(&threads[n].keys, sizeof(threads[n].keys))) 507 panic("Failed to init thread pauth keys"); 508 } 509 510 void thread_init_core_local_pauth_keys(void) 511 { 512 struct thread_core_local *tcl = thread_core_local; 513 size_t n = 0; 514 515 for (n = 0; n < CFG_TEE_CORE_NB_CORE; n++) 516 if (crypto_rng_read(&tcl[n].keys, sizeof(tcl[n].keys))) 517 panic("Failed to init core local pauth keys"); 518 } 519 #endif 520 521 struct thread_specific_data * __noprof thread_get_tsd(void) 522 { 523 return &threads[thread_get_id()].tsd; 524 } 525 526 struct thread_ctx_regs * __nostackcheck thread_get_ctx_regs(void) 527 { 528 struct thread_core_local *l = thread_get_core_local(); 529 530 assert(l->curr_thread != THREAD_ID_INVALID); 531 return &threads[l->curr_thread].regs; 532 } 533 534 void thread_set_foreign_intr(bool enable) 535 { 536 /* thread_get_core_local() requires foreign interrupts to be disabled */ 537 uint32_t exceptions = thread_mask_exceptions(THREAD_EXCP_FOREIGN_INTR); 538 struct thread_core_local *l; 539 540 l = thread_get_core_local(); 541 542 assert(l->curr_thread != THREAD_ID_INVALID); 543 544 if (enable) { 545 threads[l->curr_thread].flags |= 546 THREAD_FLAGS_FOREIGN_INTR_ENABLE; 547 thread_set_exceptions(exceptions & ~THREAD_EXCP_FOREIGN_INTR); 548 } else { 549 /* 550 * No need to disable foreign interrupts here since they're 551 * already disabled above. 552 */ 553 threads[l->curr_thread].flags &= 554 ~THREAD_FLAGS_FOREIGN_INTR_ENABLE; 555 } 556 } 557 558 void thread_restore_foreign_intr(void) 559 { 560 /* thread_get_core_local() requires foreign interrupts to be disabled */ 561 uint32_t exceptions = thread_mask_exceptions(THREAD_EXCP_FOREIGN_INTR); 562 struct thread_core_local *l; 563 564 l = thread_get_core_local(); 565 566 assert(l->curr_thread != THREAD_ID_INVALID); 567 568 if (threads[l->curr_thread].flags & THREAD_FLAGS_FOREIGN_INTR_ENABLE) 569 thread_set_exceptions(exceptions & ~THREAD_EXCP_FOREIGN_INTR); 570 } 571 572 static struct mobj *alloc_shm(enum thread_shm_type shm_type, size_t size) 573 { 574 switch (shm_type) { 575 case THREAD_SHM_TYPE_APPLICATION: 576 return thread_rpc_alloc_payload(size); 577 case THREAD_SHM_TYPE_KERNEL_PRIVATE: 578 return thread_rpc_alloc_kernel_payload(size); 579 case THREAD_SHM_TYPE_GLOBAL: 580 return thread_rpc_alloc_global_payload(size); 581 default: 582 return NULL; 583 } 584 } 585 586 static void clear_shm_cache_entry(struct thread_shm_cache_entry *ce) 587 { 588 if (ce->mobj) { 589 switch (ce->type) { 590 case THREAD_SHM_TYPE_APPLICATION: 591 thread_rpc_free_payload(ce->mobj); 592 break; 593 case THREAD_SHM_TYPE_KERNEL_PRIVATE: 594 thread_rpc_free_kernel_payload(ce->mobj); 595 break; 596 case THREAD_SHM_TYPE_GLOBAL: 597 thread_rpc_free_global_payload(ce->mobj); 598 break; 599 default: 600 assert(0); /* "can't happen" */ 601 break; 602 } 603 } 604 ce->mobj = NULL; 605 ce->size = 0; 606 } 607 608 static struct thread_shm_cache_entry * 609 get_shm_cache_entry(enum thread_shm_cache_user user) 610 { 611 struct thread_shm_cache *cache = &threads[thread_get_id()].shm_cache; 612 struct thread_shm_cache_entry *ce = NULL; 613 614 SLIST_FOREACH(ce, cache, link) 615 if (ce->user == user) 616 return ce; 617 618 ce = calloc(1, sizeof(*ce)); 619 if (ce) { 620 ce->user = user; 621 SLIST_INSERT_HEAD(cache, ce, link); 622 } 623 624 return ce; 625 } 626 627 void *thread_rpc_shm_cache_alloc(enum thread_shm_cache_user user, 628 enum thread_shm_type shm_type, 629 size_t size, struct mobj **mobj) 630 { 631 struct thread_shm_cache_entry *ce = NULL; 632 size_t sz = size; 633 paddr_t p = 0; 634 void *va = NULL; 635 636 if (!size) 637 return NULL; 638 639 ce = get_shm_cache_entry(user); 640 if (!ce) 641 return NULL; 642 643 /* 644 * Always allocate in page chunks as normal world allocates payload 645 * memory as complete pages. 646 */ 647 sz = ROUNDUP(size, SMALL_PAGE_SIZE); 648 649 if (ce->type != shm_type || sz > ce->size) { 650 clear_shm_cache_entry(ce); 651 652 ce->mobj = alloc_shm(shm_type, sz); 653 if (!ce->mobj) 654 return NULL; 655 656 if (mobj_get_pa(ce->mobj, 0, 0, &p)) 657 goto err; 658 659 if (!IS_ALIGNED_WITH_TYPE(p, uint64_t)) 660 goto err; 661 662 va = mobj_get_va(ce->mobj, 0, sz); 663 if (!va) 664 goto err; 665 666 ce->size = sz; 667 ce->type = shm_type; 668 } else { 669 va = mobj_get_va(ce->mobj, 0, sz); 670 if (!va) 671 goto err; 672 } 673 *mobj = ce->mobj; 674 675 return va; 676 err: 677 clear_shm_cache_entry(ce); 678 return NULL; 679 } 680 681 void thread_rpc_shm_cache_clear(struct thread_shm_cache *cache) 682 { 683 while (true) { 684 struct thread_shm_cache_entry *ce = SLIST_FIRST(cache); 685 686 if (!ce) 687 break; 688 SLIST_REMOVE_HEAD(cache, link); 689 clear_shm_cache_entry(ce); 690 free(ce); 691 } 692 } 693