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