tools/perf/util/jitdump.c

   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 }