tools/perf/util/jitdump.c

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