1 // SPDX-License-Identifier: GPL-2.0 2 #include <sys/sysmacros.h> 3 #include <sys/types.h> 4 #include <errno.h> 5 #include <libgen.h> 6 #include <stdio.h> 7 #include <stdlib.h> 8 #include <string.h> 9 #include <fcntl.h> 10 #include <unistd.h> 11 #include <inttypes.h> 12 #include <byteswap.h> 13 #include <sys/stat.h> 14 #include <sys/mman.h> 15 #include <linux/stringify.h> 16 17 #include "build-id.h" 18 #include "event.h" 19 #include "debug.h" 20 #include "evlist.h" 21 #include "namespaces.h" 22 #include "symbol.h" 23 #include <elf.h> 24 25 #include "tsc.h" 26 #include "session.h" 27 #include "jit.h" 28 #include "jitdump.h" 29 #include "genelf.h" 30 #include "thread.h" 31 32 #include <linux/ctype.h> 33 #include <linux/zalloc.h> 34 35 struct jit_buf_desc { 36 struct perf_data *output; 37 struct perf_session *session; 38 struct machine *machine; 39 struct nsinfo *nsi; 40 union jr_entry *entry; 41 void *buf; 42 uint64_t sample_type; 43 size_t bufsize; 44 FILE *in; 45 bool needs_bswap; /* handles cross-endianness */ 46 bool use_arch_timestamp; 47 void *debug_data; 48 void *unwinding_data; 49 uint64_t unwinding_size; 50 uint64_t unwinding_mapped_size; 51 uint64_t eh_frame_hdr_size; 52 size_t nr_debug_entries; 53 uint32_t code_load_count; 54 u64 bytes_written; 55 struct rb_root code_root; 56 char dir[PATH_MAX]; 57 }; 58 59 struct jit_tool { 60 struct perf_tool tool; 61 struct perf_data output; 62 struct perf_data input; 63 u64 bytes_written; 64 }; 65 66 #define hmax(a, b) ((a) > (b) ? (a) : (b)) 67 #define get_jit_tool(t) (container_of(tool, struct jit_tool, tool)) 68 69 static int 70 jit_emit_elf(struct jit_buf_desc *jd, 71 char *filename, 72 const char *sym, 73 uint64_t code_addr, 74 const void *code, 75 int csize, 76 void *debug, 77 int nr_debug_entries, 78 void *unwinding, 79 uint32_t unwinding_header_size, 80 uint32_t unwinding_size) 81 { 82 int ret, fd, saved_errno; 83 struct nscookie nsc; 84 85 if (verbose > 0) 86 fprintf(stderr, "write ELF image %s\n", filename); 87 88 nsinfo__mountns_enter(jd->nsi, &nsc); 89 fd = open(filename, O_CREAT|O_TRUNC|O_WRONLY, 0644); 90 saved_errno = errno; 91 nsinfo__mountns_exit(&nsc); 92 if (fd == -1) { 93 pr_warning("cannot create jit ELF %s: %s\n", filename, strerror(saved_errno)); 94 return -1; 95 } 96 97 ret = jit_write_elf(fd, code_addr, sym, (const void *)code, csize, debug, nr_debug_entries, 98 unwinding, unwinding_header_size, unwinding_size); 99 100 close(fd); 101 102 if (ret) { 103 nsinfo__mountns_enter(jd->nsi, &nsc); 104 unlink(filename); 105 nsinfo__mountns_exit(&nsc); 106 } 107 108 return ret; 109 } 110 111 static void 112 jit_close(struct jit_buf_desc *jd) 113 { 114 if (!(jd && jd->in)) 115 return; 116 funlockfile(jd->in); 117 fclose(jd->in); 118 jd->in = NULL; 119 } 120 121 static int 122 jit_validate_events(struct perf_session *session) 123 { 124 struct evsel *evsel; 125 126 /* 127 * check that all events use CLOCK_MONOTONIC 128 */ 129 evlist__for_each_entry(session->evlist, evsel) { 130 if (evsel->core.attr.use_clockid == 0 || evsel->core.attr.clockid != CLOCK_MONOTONIC) 131 return -1; 132 } 133 return 0; 134 } 135 136 static int 137 jit_open(struct jit_buf_desc *jd, const char *name) 138 { 139 struct jitheader header; 140 struct nscookie nsc; 141 struct jr_prefix *prefix; 142 ssize_t bs, bsz = 0; 143 void *n, *buf = NULL; 144 int ret, retval = -1; 145 146 nsinfo__mountns_enter(jd->nsi, &nsc); 147 jd->in = fopen(name, "r"); 148 nsinfo__mountns_exit(&nsc); 149 if (!jd->in) 150 return -1; 151 152 bsz = hmax(sizeof(header), sizeof(*prefix)); 153 154 buf = malloc(bsz); 155 if (!buf) 156 goto error; 157 158 /* 159 * protect from writer modifying the file while we are reading it 160 */ 161 flockfile(jd->in); 162 163 ret = fread(buf, sizeof(header), 1, jd->in); 164 if (ret != 1) 165 goto error; 166 167 memcpy(&header, buf, sizeof(header)); 168 169 if (header.magic != JITHEADER_MAGIC) { 170 if (header.magic != JITHEADER_MAGIC_SW) 171 goto error; 172 jd->needs_bswap = true; 173 } 174 175 if (jd->needs_bswap) { 176 header.version = bswap_32(header.version); 177 header.total_size = bswap_32(header.total_size); 178 header.pid = bswap_32(header.pid); 179 header.elf_mach = bswap_32(header.elf_mach); 180 header.timestamp = bswap_64(header.timestamp); 181 header.flags = bswap_64(header.flags); 182 } 183 184 jd->use_arch_timestamp = header.flags & JITDUMP_FLAGS_ARCH_TIMESTAMP; 185 186 if (verbose > 2) 187 pr_debug("version=%u\nhdr.size=%u\nts=0x%llx\npid=%d\nelf_mach=%d\nuse_arch_timestamp=%d\n", 188 header.version, 189 header.total_size, 190 (unsigned long long)header.timestamp, 191 header.pid, 192 header.elf_mach, 193 jd->use_arch_timestamp); 194 195 if (header.version > JITHEADER_VERSION) { 196 pr_err("wrong jitdump version %u, expected " __stringify(JITHEADER_VERSION), 197 header.version); 198 goto error; 199 } 200 201 if (header.flags & JITDUMP_FLAGS_RESERVED) { 202 pr_err("jitdump file contains invalid or unsupported flags 0x%llx\n", 203 (unsigned long long)header.flags & JITDUMP_FLAGS_RESERVED); 204 goto error; 205 } 206 207 if (jd->use_arch_timestamp && !jd->session->time_conv.time_mult) { 208 pr_err("jitdump file uses arch timestamps but there is no timestamp conversion\n"); 209 goto error; 210 } 211 212 /* 213 * validate event is using the correct clockid 214 */ 215 if (!jd->use_arch_timestamp && jit_validate_events(jd->session)) { 216 pr_err("error, jitted code must be sampled with perf record -k 1\n"); 217 goto error; 218 } 219 220 bs = header.total_size - sizeof(header); 221 222 if (bs > bsz) { 223 n = realloc(buf, bs); 224 if (!n) 225 goto error; 226 bsz = bs; 227 buf = n; 228 /* read extra we do not know about */ 229 ret = fread(buf, bs - bsz, 1, jd->in); 230 if (ret != 1) 231 goto error; 232 } 233 /* 234 * keep dirname for generating files and mmap records 235 */ 236 strcpy(jd->dir, name); 237 dirname(jd->dir); 238 239 return 0; 240 error: 241 funlockfile(jd->in); 242 fclose(jd->in); 243 return retval; 244 } 245 246 static union jr_entry * 247 jit_get_next_entry(struct jit_buf_desc *jd) 248 { 249 struct jr_prefix *prefix; 250 union jr_entry *jr; 251 void *addr; 252 size_t bs, size; 253 int id, ret; 254 255 if (!(jd && jd->in)) 256 return NULL; 257 258 if (jd->buf == NULL) { 259 size_t sz = getpagesize(); 260 if (sz < sizeof(*prefix)) 261 sz = sizeof(*prefix); 262 263 jd->buf = malloc(sz); 264 if (jd->buf == NULL) 265 return NULL; 266 267 jd->bufsize = sz; 268 } 269 270 prefix = jd->buf; 271 272 /* 273 * file is still locked at this point 274 */ 275 ret = fread(prefix, sizeof(*prefix), 1, jd->in); 276 if (ret != 1) 277 return NULL; 278 279 if (jd->needs_bswap) { 280 prefix->id = bswap_32(prefix->id); 281 prefix->total_size = bswap_32(prefix->total_size); 282 prefix->timestamp = bswap_64(prefix->timestamp); 283 } 284 id = prefix->id; 285 size = prefix->total_size; 286 287 bs = (size_t)size; 288 if (bs < sizeof(*prefix)) 289 return NULL; 290 291 if (id >= JIT_CODE_MAX) { 292 pr_warning("next_entry: unknown record type %d, skipping\n", id); 293 } 294 if (bs > jd->bufsize) { 295 void *n; 296 n = realloc(jd->buf, bs); 297 if (!n) 298 return NULL; 299 jd->buf = n; 300 jd->bufsize = bs; 301 } 302 303 addr = ((void *)jd->buf) + sizeof(*prefix); 304 305 ret = fread(addr, bs - sizeof(*prefix), 1, jd->in); 306 if (ret != 1) 307 return NULL; 308 309 jr = (union jr_entry *)jd->buf; 310 311 switch(id) { 312 case JIT_CODE_DEBUG_INFO: 313 if (jd->needs_bswap) { 314 uint64_t n; 315 jr->info.code_addr = bswap_64(jr->info.code_addr); 316 jr->info.nr_entry = bswap_64(jr->info.nr_entry); 317 for (n = 0 ; n < jr->info.nr_entry; n++) { 318 jr->info.entries[n].addr = bswap_64(jr->info.entries[n].addr); 319 jr->info.entries[n].lineno = bswap_32(jr->info.entries[n].lineno); 320 jr->info.entries[n].discrim = bswap_32(jr->info.entries[n].discrim); 321 } 322 } 323 break; 324 case JIT_CODE_UNWINDING_INFO: 325 if (jd->needs_bswap) { 326 jr->unwinding.unwinding_size = bswap_64(jr->unwinding.unwinding_size); 327 jr->unwinding.eh_frame_hdr_size = bswap_64(jr->unwinding.eh_frame_hdr_size); 328 jr->unwinding.mapped_size = bswap_64(jr->unwinding.mapped_size); 329 } 330 break; 331 case JIT_CODE_CLOSE: 332 break; 333 case JIT_CODE_LOAD: 334 if (jd->needs_bswap) { 335 jr->load.pid = bswap_32(jr->load.pid); 336 jr->load.tid = bswap_32(jr->load.tid); 337 jr->load.vma = bswap_64(jr->load.vma); 338 jr->load.code_addr = bswap_64(jr->load.code_addr); 339 jr->load.code_size = bswap_64(jr->load.code_size); 340 jr->load.code_index= bswap_64(jr->load.code_index); 341 } 342 jd->code_load_count++; 343 break; 344 case JIT_CODE_MOVE: 345 if (jd->needs_bswap) { 346 jr->move.pid = bswap_32(jr->move.pid); 347 jr->move.tid = bswap_32(jr->move.tid); 348 jr->move.vma = bswap_64(jr->move.vma); 349 jr->move.old_code_addr = bswap_64(jr->move.old_code_addr); 350 jr->move.new_code_addr = bswap_64(jr->move.new_code_addr); 351 jr->move.code_size = bswap_64(jr->move.code_size); 352 jr->move.code_index = bswap_64(jr->move.code_index); 353 } 354 break; 355 case JIT_CODE_MAX: 356 default: 357 /* skip unknown record (we have read them) */ 358 break; 359 } 360 return jr; 361 } 362 363 static int 364 jit_inject_event(struct jit_buf_desc *jd, union perf_event *event) 365 { 366 ssize_t size; 367 368 size = perf_data__write(jd->output, event, event->header.size); 369 if (size < 0) 370 return -1; 371 372 jd->bytes_written += size; 373 return 0; 374 } 375 376 static pid_t jr_entry_pid(struct jit_buf_desc *jd, union jr_entry *jr) 377 { 378 if (jd->nsi && nsinfo__in_pidns(jd->nsi)) 379 return nsinfo__tgid(jd->nsi); 380 return jr->load.pid; 381 } 382 383 static pid_t jr_entry_tid(struct jit_buf_desc *jd, union jr_entry *jr) 384 { 385 if (jd->nsi && nsinfo__in_pidns(jd->nsi)) 386 return nsinfo__pid(jd->nsi); 387 return jr->load.tid; 388 } 389 390 static uint64_t convert_timestamp(struct jit_buf_desc *jd, uint64_t timestamp) 391 { 392 struct perf_tsc_conversion tc = { .time_shift = 0, }; 393 struct perf_record_time_conv *time_conv = &jd->session->time_conv; 394 395 if (!jd->use_arch_timestamp) 396 return timestamp; 397 398 tc.time_shift = time_conv->time_shift; 399 tc.time_mult = time_conv->time_mult; 400 tc.time_zero = time_conv->time_zero; 401 402 /* 403 * The event TIME_CONV was extended for the fields from "time_cycles" 404 * when supported cap_user_time_short, for backward compatibility, 405 * checks the event size and assigns these extended fields if these 406 * fields are contained in the event. 407 */ 408 if (event_contains(*time_conv, time_cycles)) { 409 tc.time_cycles = time_conv->time_cycles; 410 tc.time_mask = time_conv->time_mask; 411 tc.cap_user_time_zero = time_conv->cap_user_time_zero; 412 tc.cap_user_time_short = time_conv->cap_user_time_short; 413 414 if (!tc.cap_user_time_zero) 415 return 0; 416 } 417 418 return tsc_to_perf_time(timestamp, &tc); 419 } 420 421 static int jit_repipe_code_load(struct jit_buf_desc *jd, union jr_entry *jr) 422 { 423 struct perf_sample sample; 424 union perf_event *event; 425 struct perf_tool *tool = jd->session->tool; 426 uint64_t code, addr; 427 uintptr_t uaddr; 428 char *filename; 429 struct stat st; 430 size_t size; 431 u16 idr_size; 432 const char *sym; 433 uint64_t count; 434 int ret, csize, usize; 435 pid_t nspid, pid, tid; 436 struct { 437 u32 pid, tid; 438 u64 time; 439 } *id; 440 441 nspid = jr->load.pid; 442 pid = jr_entry_pid(jd, jr); 443 tid = jr_entry_tid(jd, jr); 444 csize = jr->load.code_size; 445 usize = jd->unwinding_mapped_size; 446 addr = jr->load.code_addr; 447 sym = (void *)((unsigned long)jr + sizeof(jr->load)); 448 code = (unsigned long)jr + jr->load.p.total_size - csize; 449 count = jr->load.code_index; 450 idr_size = jd->machine->id_hdr_size; 451 452 event = calloc(1, sizeof(*event) + idr_size); 453 if (!event) 454 return -1; 455 456 filename = event->mmap2.filename; 457 size = snprintf(filename, PATH_MAX, "%s/jitted-%d-%" PRIu64 ".so", 458 jd->dir, 459 nspid, 460 count); 461 462 size++; /* for \0 */ 463 464 size = PERF_ALIGN(size, sizeof(u64)); 465 uaddr = (uintptr_t)code; 466 ret = jit_emit_elf(jd, filename, sym, addr, (const void *)uaddr, csize, jd->debug_data, jd->nr_debug_entries, 467 jd->unwinding_data, jd->eh_frame_hdr_size, jd->unwinding_size); 468 469 if (jd->debug_data && jd->nr_debug_entries) { 470 zfree(&jd->debug_data); 471 jd->nr_debug_entries = 0; 472 } 473 474 if (jd->unwinding_data && jd->eh_frame_hdr_size) { 475 zfree(&jd->unwinding_data); 476 jd->eh_frame_hdr_size = 0; 477 jd->unwinding_mapped_size = 0; 478 jd->unwinding_size = 0; 479 } 480 481 if (ret) { 482 free(event); 483 return -1; 484 } 485 if (nsinfo__stat(filename, &st, jd->nsi)) 486 memset(&st, 0, sizeof(st)); 487 488 event->mmap2.header.type = PERF_RECORD_MMAP2; 489 event->mmap2.header.misc = PERF_RECORD_MISC_USER; 490 event->mmap2.header.size = (sizeof(event->mmap2) - 491 (sizeof(event->mmap2.filename) - size) + idr_size); 492 493 event->mmap2.pgoff = GEN_ELF_TEXT_OFFSET; 494 event->mmap2.start = addr; 495 event->mmap2.len = usize ? ALIGN_8(csize) + usize : csize; 496 event->mmap2.pid = pid; 497 event->mmap2.tid = tid; 498 event->mmap2.ino = st.st_ino; 499 event->mmap2.maj = major(st.st_dev); 500 event->mmap2.min = minor(st.st_dev); 501 event->mmap2.prot = st.st_mode; 502 event->mmap2.flags = MAP_SHARED; 503 event->mmap2.ino_generation = 1; 504 505 id = (void *)((unsigned long)event + event->mmap.header.size - idr_size); 506 if (jd->sample_type & PERF_SAMPLE_TID) { 507 id->pid = pid; 508 id->tid = tid; 509 } 510 if (jd->sample_type & PERF_SAMPLE_TIME) 511 id->time = convert_timestamp(jd, jr->load.p.timestamp); 512 513 /* 514 * create pseudo sample to induce dso hit increment 515 * use first address as sample address 516 */ 517 memset(&sample, 0, sizeof(sample)); 518 sample.cpumode = PERF_RECORD_MISC_USER; 519 sample.pid = pid; 520 sample.tid = tid; 521 sample.time = id->time; 522 sample.ip = addr; 523 524 ret = perf_event__process_mmap2(tool, event, &sample, jd->machine); 525 if (ret) 526 return ret; 527 528 ret = jit_inject_event(jd, event); 529 /* 530 * mark dso as use to generate buildid in the header 531 */ 532 if (!ret) 533 build_id__mark_dso_hit(tool, event, &sample, NULL, jd->machine); 534 535 return ret; 536 } 537 538 static int jit_repipe_code_move(struct jit_buf_desc *jd, union jr_entry *jr) 539 { 540 struct perf_sample sample; 541 union perf_event *event; 542 struct perf_tool *tool = jd->session->tool; 543 char *filename; 544 size_t size; 545 struct stat st; 546 int usize; 547 u16 idr_size; 548 int ret; 549 pid_t nspid, pid, tid; 550 struct { 551 u32 pid, tid; 552 u64 time; 553 } *id; 554 555 nspid = jr->load.pid; 556 pid = jr_entry_pid(jd, jr); 557 tid = jr_entry_tid(jd, jr); 558 usize = jd->unwinding_mapped_size; 559 idr_size = jd->machine->id_hdr_size; 560 561 /* 562 * +16 to account for sample_id_all (hack) 563 */ 564 event = calloc(1, sizeof(*event) + 16); 565 if (!event) 566 return -1; 567 568 filename = event->mmap2.filename; 569 size = snprintf(filename, PATH_MAX, "%s/jitted-%d-%" PRIu64 ".so", 570 jd->dir, 571 nspid, 572 jr->move.code_index); 573 574 size++; /* for \0 */ 575 576 if (nsinfo__stat(filename, &st, jd->nsi)) 577 memset(&st, 0, sizeof(st)); 578 579 size = PERF_ALIGN(size, sizeof(u64)); 580 581 event->mmap2.header.type = PERF_RECORD_MMAP2; 582 event->mmap2.header.misc = PERF_RECORD_MISC_USER; 583 event->mmap2.header.size = (sizeof(event->mmap2) - 584 (sizeof(event->mmap2.filename) - size) + idr_size); 585 event->mmap2.pgoff = GEN_ELF_TEXT_OFFSET; 586 event->mmap2.start = jr->move.new_code_addr; 587 event->mmap2.len = usize ? ALIGN_8(jr->move.code_size) + usize 588 : jr->move.code_size; 589 event->mmap2.pid = pid; 590 event->mmap2.tid = tid; 591 event->mmap2.ino = st.st_ino; 592 event->mmap2.maj = major(st.st_dev); 593 event->mmap2.min = minor(st.st_dev); 594 event->mmap2.prot = st.st_mode; 595 event->mmap2.flags = MAP_SHARED; 596 event->mmap2.ino_generation = 1; 597 598 id = (void *)((unsigned long)event + event->mmap.header.size - idr_size); 599 if (jd->sample_type & PERF_SAMPLE_TID) { 600 id->pid = pid; 601 id->tid = tid; 602 } 603 if (jd->sample_type & PERF_SAMPLE_TIME) 604 id->time = convert_timestamp(jd, jr->load.p.timestamp); 605 606 /* 607 * create pseudo sample to induce dso hit increment 608 * use first address as sample address 609 */ 610 memset(&sample, 0, sizeof(sample)); 611 sample.cpumode = PERF_RECORD_MISC_USER; 612 sample.pid = pid; 613 sample.tid = tid; 614 sample.time = id->time; 615 sample.ip = jr->move.new_code_addr; 616 617 ret = perf_event__process_mmap2(tool, event, &sample, jd->machine); 618 if (ret) 619 return ret; 620 621 ret = jit_inject_event(jd, event); 622 if (!ret) 623 build_id__mark_dso_hit(tool, event, &sample, NULL, jd->machine); 624 625 return ret; 626 } 627 628 static int jit_repipe_debug_info(struct jit_buf_desc *jd, union jr_entry *jr) 629 { 630 void *data; 631 size_t sz; 632 633 if (!(jd && jr)) 634 return -1; 635 636 sz = jr->prefix.total_size - sizeof(jr->info); 637 data = malloc(sz); 638 if (!data) 639 return -1; 640 641 memcpy(data, &jr->info.entries, sz); 642 643 jd->debug_data = data; 644 645 /* 646 * we must use nr_entry instead of size here because 647 * we cannot distinguish actual entry from padding otherwise 648 */ 649 jd->nr_debug_entries = jr->info.nr_entry; 650 651 return 0; 652 } 653 654 static int 655 jit_repipe_unwinding_info(struct jit_buf_desc *jd, union jr_entry *jr) 656 { 657 void *unwinding_data; 658 uint32_t unwinding_data_size; 659 660 if (!(jd && jr)) 661 return -1; 662 663 unwinding_data_size = jr->prefix.total_size - sizeof(jr->unwinding); 664 unwinding_data = malloc(unwinding_data_size); 665 if (!unwinding_data) 666 return -1; 667 668 memcpy(unwinding_data, &jr->unwinding.unwinding_data, 669 unwinding_data_size); 670 671 jd->eh_frame_hdr_size = jr->unwinding.eh_frame_hdr_size; 672 jd->unwinding_size = jr->unwinding.unwinding_size; 673 jd->unwinding_mapped_size = jr->unwinding.mapped_size; 674 jd->unwinding_data = unwinding_data; 675 676 return 0; 677 } 678 679 static int 680 jit_process_dump(struct jit_buf_desc *jd) 681 { 682 union jr_entry *jr; 683 int ret = 0; 684 685 while ((jr = jit_get_next_entry(jd))) { 686 switch(jr->prefix.id) { 687 case JIT_CODE_LOAD: 688 ret = jit_repipe_code_load(jd, jr); 689 break; 690 case JIT_CODE_MOVE: 691 ret = jit_repipe_code_move(jd, jr); 692 break; 693 case JIT_CODE_DEBUG_INFO: 694 ret = jit_repipe_debug_info(jd, jr); 695 break; 696 case JIT_CODE_UNWINDING_INFO: 697 ret = jit_repipe_unwinding_info(jd, jr); 698 break; 699 default: 700 ret = 0; 701 continue; 702 } 703 } 704 return ret; 705 } 706 707 static int 708 jit_inject(struct jit_buf_desc *jd, char *path) 709 { 710 int ret; 711 712 if (verbose > 0) 713 fprintf(stderr, "injecting: %s\n", path); 714 715 ret = jit_open(jd, path); 716 if (ret) 717 return -1; 718 719 ret = jit_process_dump(jd); 720 721 jit_close(jd); 722 723 if (verbose > 0) 724 fprintf(stderr, "injected: %s (%d)\n", path, ret); 725 726 return 0; 727 } 728 729 /* 730 * File must be with pattern .../jit-XXXX.dump 731 * where XXXX is the PID of the process which did the mmap() 732 * as captured in the RECORD_MMAP record 733 */ 734 static int 735 jit_detect(char *mmap_name, pid_t pid, struct nsinfo *nsi) 736 { 737 char *p; 738 char *end = NULL; 739 pid_t pid2; 740 741 if (verbose > 2) 742 fprintf(stderr, "jit marker trying : %s\n", mmap_name); 743 /* 744 * get file name 745 */ 746 p = strrchr(mmap_name, '/'); 747 if (!p) 748 return -1; 749 750 /* 751 * match prefix 752 */ 753 if (strncmp(p, "/jit-", 5)) 754 return -1; 755 756 /* 757 * skip prefix 758 */ 759 p += 5; 760 761 /* 762 * must be followed by a pid 763 */ 764 if (!isdigit(*p)) 765 return -1; 766 767 pid2 = (int)strtol(p, &end, 10); 768 if (!end) 769 return -1; 770 771 /* 772 * pid does not match mmap pid 773 * pid==0 in system-wide mode (synthesized) 774 */ 775 if (pid && pid2 != nsinfo__nstgid(nsi)) 776 return -1; 777 /* 778 * validate suffix 779 */ 780 if (strcmp(end, ".dump")) 781 return -1; 782 783 if (verbose > 0) 784 fprintf(stderr, "jit marker found: %s\n", mmap_name); 785 786 return 0; 787 } 788 789 static void jit_add_pid(struct machine *machine, pid_t pid) 790 { 791 struct thread *thread = machine__findnew_thread(machine, pid, pid); 792 793 if (!thread) { 794 pr_err("%s: thread %d not found or created\n", __func__, pid); 795 return; 796 } 797 798 thread->priv = (void *)1; 799 } 800 801 static bool jit_has_pid(struct machine *machine, pid_t pid) 802 { 803 struct thread *thread = machine__find_thread(machine, pid, pid); 804 805 if (!thread) 806 return 0; 807 808 return (bool)thread->priv; 809 } 810 811 int 812 jit_process(struct perf_session *session, 813 struct perf_data *output, 814 struct machine *machine, 815 char *filename, 816 pid_t pid, 817 pid_t tid, 818 u64 *nbytes) 819 { 820 struct thread *thread; 821 struct nsinfo *nsi; 822 struct evsel *first; 823 struct jit_buf_desc jd; 824 int ret; 825 826 thread = machine__findnew_thread(machine, pid, tid); 827 if (thread == NULL) { 828 pr_err("problem processing JIT mmap event, skipping it.\n"); 829 return 0; 830 } 831 832 nsi = nsinfo__get(thread->nsinfo); 833 thread__put(thread); 834 835 /* 836 * first, detect marker mmap (i.e., the jitdump mmap) 837 */ 838 if (jit_detect(filename, pid, nsi)) { 839 nsinfo__put(nsi); 840 841 /* 842 * Strip //anon*, [anon:* and /memfd:* mmaps if we processed a jitdump for this pid 843 */ 844 if (jit_has_pid(machine, pid) && 845 ((strncmp(filename, "//anon", 6) == 0) || 846 (strncmp(filename, "[anon:", 6) == 0) || 847 (strncmp(filename, "/memfd:", 7) == 0))) 848 return 1; 849 850 return 0; 851 } 852 853 memset(&jd, 0, sizeof(jd)); 854 855 jd.session = session; 856 jd.output = output; 857 jd.machine = machine; 858 jd.nsi = nsi; 859 860 /* 861 * track sample_type to compute id_all layout 862 * perf sets the same sample type to all events as of now 863 */ 864 first = evlist__first(session->evlist); 865 jd.sample_type = first->core.attr.sample_type; 866 867 *nbytes = 0; 868 869 ret = jit_inject(&jd, filename); 870 if (!ret) { 871 jit_add_pid(machine, pid); 872 *nbytes = jd.bytes_written; 873 ret = 1; 874 } 875 876 nsinfo__put(jd.nsi); 877 878 return ret; 879 } 880