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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 "symbol.h"
22#include <elf.h>
23
24#include "tsc.h"
25#include "session.h"
26#include "jit.h"
27#include "jitdump.h"
28#include "genelf.h"
29
30#include <linux/ctype.h>
31#include <linux/zalloc.h>
32
33struct jit_buf_desc {
34 struct perf_data *output;
35 struct perf_session *session;
36 struct machine *machine;
37 union jr_entry *entry;
38 void *buf;
39 uint64_t sample_type;
40 size_t bufsize;
41 FILE *in;
42 bool needs_bswap; /* handles cross-endianness */
43 bool use_arch_timestamp;
44 void *debug_data;
45 void *unwinding_data;
46 uint64_t unwinding_size;
47 uint64_t unwinding_mapped_size;
48 uint64_t eh_frame_hdr_size;
49 size_t nr_debug_entries;
50 uint32_t code_load_count;
51 u64 bytes_written;
52 struct rb_root code_root;
53 char dir[PATH_MAX];
54};
55
56struct debug_line_info {
57 unsigned long vma;
58 unsigned int lineno;
59 /* The filename format is unspecified, absolute path, relative etc. */
60 char const filename[0];
61};
62
63struct jit_tool {
64 struct perf_tool tool;
65 struct perf_data output;
66 struct perf_data input;
67 u64 bytes_written;
68};
69
70#define hmax(a, b) ((a) > (b) ? (a) : (b))
71#define get_jit_tool(t) (container_of(tool, struct jit_tool, tool))
72
73static int
74jit_emit_elf(char *filename,
75 const char *sym,
76 uint64_t code_addr,
77 const void *code,
78 int csize,
79 void *debug,
80 int nr_debug_entries,
81 void *unwinding,
82 uint32_t unwinding_header_size,
83 uint32_t unwinding_size)
84{
85 int ret, fd;
86
87 if (verbose > 0)
88 fprintf(stderr, "write ELF image %s\n", filename);
89
90 fd = open(filename, O_CREAT|O_TRUNC|O_WRONLY, 0644);
91 if (fd == -1) {
92 pr_warning("cannot create jit ELF %s: %s\n", filename, strerror(errno));
93 return -1;
94 }
95
96 ret = jit_write_elf(fd, code_addr, sym, (const void *)code, csize, debug, nr_debug_entries,
97 unwinding, unwinding_header_size, unwinding_size);
98
99 close(fd);
100
101 if (ret)
102 unlink(filename);
103
104 return ret;
105}
106
107static void
108jit_close(struct jit_buf_desc *jd)
109{
110 if (!(jd && jd->in))
111 return;
112 funlockfile(jd->in);
113 fclose(jd->in);
114 jd->in = NULL;
115}
116
117static int
118jit_validate_events(struct perf_session *session)
119{
120 struct evsel *evsel;
121
122 /*
123 * check that all events use CLOCK_MONOTONIC
124 */
125 evlist__for_each_entry(session->evlist, evsel) {
126 if (evsel->core.attr.use_clockid == 0 || evsel->core.attr.clockid != CLOCK_MONOTONIC)
127 return -1;
128 }
129 return 0;
130}
131
132static int
133jit_open(struct jit_buf_desc *jd, const char *name)
134{
135 struct jitheader header;
136 struct jr_prefix *prefix;
137 ssize_t bs, bsz = 0;
138 void *n, *buf = NULL;
139 int ret, retval = -1;
140
141 jd->in = fopen(name, "r");
142 if (!jd->in)
143 return -1;
144
145 bsz = hmax(sizeof(header), sizeof(*prefix));
146
147 buf = malloc(bsz);
148 if (!buf)
149 goto error;
150
151 /*
152 * protect from writer modifying the file while we are reading it
153 */
154 flockfile(jd->in);
155
156 ret = fread(buf, sizeof(header), 1, jd->in);
157 if (ret != 1)
158 goto error;
159
160 memcpy(&header, buf, sizeof(header));
161
162 if (header.magic != JITHEADER_MAGIC) {
163 if (header.magic != JITHEADER_MAGIC_SW)
164 goto error;
165 jd->needs_bswap = true;
166 }
167
168 if (jd->needs_bswap) {
169 header.version = bswap_32(header.version);
170 header.total_size = bswap_32(header.total_size);
171 header.pid = bswap_32(header.pid);
172 header.elf_mach = bswap_32(header.elf_mach);
173 header.timestamp = bswap_64(header.timestamp);
174 header.flags = bswap_64(header.flags);
175 }
176
177 jd->use_arch_timestamp = header.flags & JITDUMP_FLAGS_ARCH_TIMESTAMP;
178
179 if (verbose > 2)
180 pr_debug("version=%u\nhdr.size=%u\nts=0x%llx\npid=%d\nelf_mach=%d\nuse_arch_timestamp=%d\n",
181 header.version,
182 header.total_size,
183 (unsigned long long)header.timestamp,
184 header.pid,
185 header.elf_mach,
186 jd->use_arch_timestamp);
187
188 if (header.version > JITHEADER_VERSION) {
189 pr_err("wrong jitdump version %u, expected " __stringify(JITHEADER_VERSION),
190 header.version);
191 goto error;
192 }
193
194 if (header.flags & JITDUMP_FLAGS_RESERVED) {
195 pr_err("jitdump file contains invalid or unsupported flags 0x%llx\n",
196 (unsigned long long)header.flags & JITDUMP_FLAGS_RESERVED);
197 goto error;
198 }
199
200 if (jd->use_arch_timestamp && !jd->session->time_conv.time_mult) {
201 pr_err("jitdump file uses arch timestamps but there is no timestamp conversion\n");
202 goto error;
203 }
204
205 /*
206 * validate event is using the correct clockid
207 */
208 if (!jd->use_arch_timestamp && jit_validate_events(jd->session)) {
209 pr_err("error, jitted code must be sampled with perf record -k 1\n");
210 goto error;
211 }
212
213 bs = header.total_size - sizeof(header);
214
215 if (bs > bsz) {
216 n = realloc(buf, bs);
217 if (!n)
218 goto error;
219 bsz = bs;
220 buf = n;
221 /* read extra we do not know about */
222 ret = fread(buf, bs - bsz, 1, jd->in);
223 if (ret != 1)
224 goto error;
225 }
226 /*
227 * keep dirname for generating files and mmap records
228 */
229 strcpy(jd->dir, name);
230 dirname(jd->dir);
231
232 return 0;
233error:
234 funlockfile(jd->in);
235 fclose(jd->in);
236 return retval;
237}
238
239static union jr_entry *
240jit_get_next_entry(struct jit_buf_desc *jd)
241{
242 struct jr_prefix *prefix;
243 union jr_entry *jr;
244 void *addr;
245 size_t bs, size;
246 int id, ret;
247
248 if (!(jd && jd->in))
249 return NULL;
250
251 if (jd->buf == NULL) {
252 size_t sz = getpagesize();
253 if (sz < sizeof(*prefix))
254 sz = sizeof(*prefix);
255
256 jd->buf = malloc(sz);
257 if (jd->buf == NULL)
258 return NULL;
259
260 jd->bufsize = sz;
261 }
262
263 prefix = jd->buf;
264
265 /*
266 * file is still locked at this point
267 */
268 ret = fread(prefix, sizeof(*prefix), 1, jd->in);
269 if (ret != 1)
270 return NULL;
271
272 if (jd->needs_bswap) {
273 prefix->id = bswap_32(prefix->id);
274 prefix->total_size = bswap_32(prefix->total_size);
275 prefix->timestamp = bswap_64(prefix->timestamp);
276 }
277 id = prefix->id;
278 size = prefix->total_size;
279
280 bs = (size_t)size;
281 if (bs < sizeof(*prefix))
282 return NULL;
283
284 if (id >= JIT_CODE_MAX) {
285 pr_warning("next_entry: unknown record type %d, skipping\n", id);
286 }
287 if (bs > jd->bufsize) {
288 void *n;
289 n = realloc(jd->buf, bs);
290 if (!n)
291 return NULL;
292 jd->buf = n;
293 jd->bufsize = bs;
294 }
295
296 addr = ((void *)jd->buf) + sizeof(*prefix);
297
298 ret = fread(addr, bs - sizeof(*prefix), 1, jd->in);
299 if (ret != 1)
300 return NULL;
301
302 jr = (union jr_entry *)jd->buf;
303
304 switch(id) {
305 case JIT_CODE_DEBUG_INFO:
306 if (jd->needs_bswap) {
307 uint64_t n;
308 jr->info.code_addr = bswap_64(jr->info.code_addr);
309 jr->info.nr_entry = bswap_64(jr->info.nr_entry);
310 for (n = 0 ; n < jr->info.nr_entry; n++) {
311 jr->info.entries[n].addr = bswap_64(jr->info.entries[n].addr);
312 jr->info.entries[n].lineno = bswap_32(jr->info.entries[n].lineno);
313 jr->info.entries[n].discrim = bswap_32(jr->info.entries[n].discrim);
314 }
315 }
316 break;
317 case JIT_CODE_UNWINDING_INFO:
318 if (jd->needs_bswap) {
319 jr->unwinding.unwinding_size = bswap_64(jr->unwinding.unwinding_size);
320 jr->unwinding.eh_frame_hdr_size = bswap_64(jr->unwinding.eh_frame_hdr_size);
321 jr->unwinding.mapped_size = bswap_64(jr->unwinding.mapped_size);
322 }
323 break;
324 case JIT_CODE_CLOSE:
325 break;
326 case JIT_CODE_LOAD:
327 if (jd->needs_bswap) {
328 jr->load.pid = bswap_32(jr->load.pid);
329 jr->load.tid = bswap_32(jr->load.tid);
330 jr->load.vma = bswap_64(jr->load.vma);
331 jr->load.code_addr = bswap_64(jr->load.code_addr);
332 jr->load.code_size = bswap_64(jr->load.code_size);
333 jr->load.code_index= bswap_64(jr->load.code_index);
334 }
335 jd->code_load_count++;
336 break;
337 case JIT_CODE_MOVE:
338 if (jd->needs_bswap) {
339 jr->move.pid = bswap_32(jr->move.pid);
340 jr->move.tid = bswap_32(jr->move.tid);
341 jr->move.vma = bswap_64(jr->move.vma);
342 jr->move.old_code_addr = bswap_64(jr->move.old_code_addr);
343 jr->move.new_code_addr = bswap_64(jr->move.new_code_addr);
344 jr->move.code_size = bswap_64(jr->move.code_size);
345 jr->move.code_index = bswap_64(jr->move.code_index);
346 }
347 break;
348 case JIT_CODE_MAX:
349 default:
350 /* skip unknown record (we have read them) */
351 break;
352 }
353 return jr;
354}
355
356static int
357jit_inject_event(struct jit_buf_desc *jd, union perf_event *event)
358{
359 ssize_t size;
360
361 size = perf_data__write(jd->output, event, event->header.size);
362 if (size < 0)
363 return -1;
364
365 jd->bytes_written += size;
366 return 0;
367}
368
369static uint64_t convert_timestamp(struct jit_buf_desc *jd, uint64_t timestamp)
370{
371 struct perf_tsc_conversion tc;
372
373 if (!jd->use_arch_timestamp)
374 return timestamp;
375
376 tc.time_shift = jd->session->time_conv.time_shift;
377 tc.time_mult = jd->session->time_conv.time_mult;
378 tc.time_zero = jd->session->time_conv.time_zero;
379
380 if (!tc.time_mult)
381 return 0;
382
383 return tsc_to_perf_time(timestamp, &tc);
384}
385
386static int jit_repipe_code_load(struct jit_buf_desc *jd, union jr_entry *jr)
387{
388 struct perf_sample sample;
389 union perf_event *event;
390 struct perf_tool *tool = jd->session->tool;
391 uint64_t code, addr;
392 uintptr_t uaddr;
393 char *filename;
394 struct stat st;
395 size_t size;
396 u16 idr_size;
397 const char *sym;
398 uint64_t count;
399 int ret, csize, usize;
400 pid_t pid, tid;
401 struct {
402 u32 pid, tid;
403 u64 time;
404 } *id;
405
406 pid = jr->load.pid;
407 tid = jr->load.tid;
408 csize = jr->load.code_size;
409 usize = jd->unwinding_mapped_size;
410 addr = jr->load.code_addr;
411 sym = (void *)((unsigned long)jr + sizeof(jr->load));
412 code = (unsigned long)jr + jr->load.p.total_size - csize;
413 count = jr->load.code_index;
414 idr_size = jd->machine->id_hdr_size;
415
416 event = calloc(1, sizeof(*event) + idr_size);
417 if (!event)
418 return -1;
419
420 filename = event->mmap2.filename;
421 size = snprintf(filename, PATH_MAX, "%s/jitted-%d-%" PRIu64 ".so",
422 jd->dir,
423 pid,
424 count);
425
426 size++; /* for \0 */
427
428 size = PERF_ALIGN(size, sizeof(u64));
429 uaddr = (uintptr_t)code;
430 ret = jit_emit_elf(filename, sym, addr, (const void *)uaddr, csize, jd->debug_data, jd->nr_debug_entries,
431 jd->unwinding_data, jd->eh_frame_hdr_size, jd->unwinding_size);
432
433 if (jd->debug_data && jd->nr_debug_entries) {
434 zfree(&jd->debug_data);
435 jd->nr_debug_entries = 0;
436 }
437
438 if (jd->unwinding_data && jd->eh_frame_hdr_size) {
439 zfree(&jd->unwinding_data);
440 jd->eh_frame_hdr_size = 0;
441 jd->unwinding_mapped_size = 0;
442 jd->unwinding_size = 0;
443 }
444
445 if (ret) {
446 free(event);
447 return -1;
448 }
449 if (stat(filename, &st))
450 memset(&st, 0, sizeof(st));
451
452 event->mmap2.header.type = PERF_RECORD_MMAP2;
453 event->mmap2.header.misc = PERF_RECORD_MISC_USER;
454 event->mmap2.header.size = (sizeof(event->mmap2) -
455 (sizeof(event->mmap2.filename) - size) + idr_size);
456
457 event->mmap2.pgoff = GEN_ELF_TEXT_OFFSET;
458 event->mmap2.start = addr;
459 event->mmap2.len = usize ? ALIGN_8(csize) + usize : csize;
460 event->mmap2.pid = pid;
461 event->mmap2.tid = tid;
462 event->mmap2.ino = st.st_ino;
463 event->mmap2.maj = major(st.st_dev);
464 event->mmap2.min = minor(st.st_dev);
465 event->mmap2.prot = st.st_mode;
466 event->mmap2.flags = MAP_SHARED;
467 event->mmap2.ino_generation = 1;
468
469 id = (void *)((unsigned long)event + event->mmap.header.size - idr_size);
470 if (jd->sample_type & PERF_SAMPLE_TID) {
471 id->pid = pid;
472 id->tid = tid;
473 }
474 if (jd->sample_type & PERF_SAMPLE_TIME)
475 id->time = convert_timestamp(jd, jr->load.p.timestamp);
476
477 /*
478 * create pseudo sample to induce dso hit increment
479 * use first address as sample address
480 */
481 memset(&sample, 0, sizeof(sample));
482 sample.cpumode = PERF_RECORD_MISC_USER;
483 sample.pid = pid;
484 sample.tid = tid;
485 sample.time = id->time;
486 sample.ip = addr;
487
488 ret = perf_event__process_mmap2(tool, event, &sample, jd->machine);
489 if (ret)
490 return ret;
491
492 ret = jit_inject_event(jd, event);
493 /*
494 * mark dso as use to generate buildid in the header
495 */
496 if (!ret)
497 build_id__mark_dso_hit(tool, event, &sample, NULL, jd->machine);
498
499 return ret;
500}
501
502static int jit_repipe_code_move(struct jit_buf_desc *jd, union jr_entry *jr)
503{
504 struct perf_sample sample;
505 union perf_event *event;
506 struct perf_tool *tool = jd->session->tool;
507 char *filename;
508 size_t size;
509 struct stat st;
510 int usize;
511 u16 idr_size;
512 int ret;
513 pid_t pid, tid;
514 struct {
515 u32 pid, tid;
516 u64 time;
517 } *id;
518
519 pid = jr->move.pid;
520 tid = jr->move.tid;
521 usize = jd->unwinding_mapped_size;
522 idr_size = jd->machine->id_hdr_size;
523
524 /*
525 * +16 to account for sample_id_all (hack)
526 */
527 event = calloc(1, sizeof(*event) + 16);
528 if (!event)
529 return -1;
530
531 filename = event->mmap2.filename;
532 size = snprintf(filename, PATH_MAX, "%s/jitted-%d-%" PRIu64 ".so",
533 jd->dir,
534 pid,
535 jr->move.code_index);
536
537 size++; /* for \0 */
538
539 if (stat(filename, &st))
540 memset(&st, 0, sizeof(st));
541
542 size = PERF_ALIGN(size, sizeof(u64));
543
544 event->mmap2.header.type = PERF_RECORD_MMAP2;
545 event->mmap2.header.misc = PERF_RECORD_MISC_USER;
546 event->mmap2.header.size = (sizeof(event->mmap2) -
547 (sizeof(event->mmap2.filename) - size) + idr_size);
548 event->mmap2.pgoff = GEN_ELF_TEXT_OFFSET;
549 event->mmap2.start = jr->move.new_code_addr;
550 event->mmap2.len = usize ? ALIGN_8(jr->move.code_size) + usize
551 : jr->move.code_size;
552 event->mmap2.pid = pid;
553 event->mmap2.tid = tid;
554 event->mmap2.ino = st.st_ino;
555 event->mmap2.maj = major(st.st_dev);
556 event->mmap2.min = minor(st.st_dev);
557 event->mmap2.prot = st.st_mode;
558 event->mmap2.flags = MAP_SHARED;
559 event->mmap2.ino_generation = 1;
560
561 id = (void *)((unsigned long)event + event->mmap.header.size - idr_size);
562 if (jd->sample_type & PERF_SAMPLE_TID) {
563 id->pid = pid;
564 id->tid = tid;
565 }
566 if (jd->sample_type & PERF_SAMPLE_TIME)
567 id->time = convert_timestamp(jd, jr->load.p.timestamp);
568
569 /*
570 * create pseudo sample to induce dso hit increment
571 * use first address as sample address
572 */
573 memset(&sample, 0, sizeof(sample));
574 sample.cpumode = PERF_RECORD_MISC_USER;
575 sample.pid = pid;
576 sample.tid = tid;
577 sample.time = id->time;
578 sample.ip = jr->move.new_code_addr;
579
580 ret = perf_event__process_mmap2(tool, event, &sample, jd->machine);
581 if (ret)
582 return ret;
583
584 ret = jit_inject_event(jd, event);
585 if (!ret)
586 build_id__mark_dso_hit(tool, event, &sample, NULL, jd->machine);
587
588 return ret;
589}
590
591static int jit_repipe_debug_info(struct jit_buf_desc *jd, union jr_entry *jr)
592{
593 void *data;
594 size_t sz;
595
596 if (!(jd && jr))
597 return -1;
598
599 sz = jr->prefix.total_size - sizeof(jr->info);
600 data = malloc(sz);
601 if (!data)
602 return -1;
603
604 memcpy(data, &jr->info.entries, sz);
605
606 jd->debug_data = data;
607
608 /*
609 * we must use nr_entry instead of size here because
610 * we cannot distinguish actual entry from padding otherwise
611 */
612 jd->nr_debug_entries = jr->info.nr_entry;
613
614 return 0;
615}
616
617static int
618jit_repipe_unwinding_info(struct jit_buf_desc *jd, union jr_entry *jr)
619{
620 void *unwinding_data;
621 uint32_t unwinding_data_size;
622
623 if (!(jd && jr))
624 return -1;
625
626 unwinding_data_size = jr->prefix.total_size - sizeof(jr->unwinding);
627 unwinding_data = malloc(unwinding_data_size);
628 if (!unwinding_data)
629 return -1;
630
631 memcpy(unwinding_data, &jr->unwinding.unwinding_data,
632 unwinding_data_size);
633
634 jd->eh_frame_hdr_size = jr->unwinding.eh_frame_hdr_size;
635 jd->unwinding_size = jr->unwinding.unwinding_size;
636 jd->unwinding_mapped_size = jr->unwinding.mapped_size;
637 jd->unwinding_data = unwinding_data;
638
639 return 0;
640}
641
642static int
643jit_process_dump(struct jit_buf_desc *jd)
644{
645 union jr_entry *jr;
646 int ret = 0;
647
648 while ((jr = jit_get_next_entry(jd))) {
649 switch(jr->prefix.id) {
650 case JIT_CODE_LOAD:
651 ret = jit_repipe_code_load(jd, jr);
652 break;
653 case JIT_CODE_MOVE:
654 ret = jit_repipe_code_move(jd, jr);
655 break;
656 case JIT_CODE_DEBUG_INFO:
657 ret = jit_repipe_debug_info(jd, jr);
658 break;
659 case JIT_CODE_UNWINDING_INFO:
660 ret = jit_repipe_unwinding_info(jd, jr);
661 break;
662 default:
663 ret = 0;
664 continue;
665 }
666 }
667 return ret;
668}
669
670static int
671jit_inject(struct jit_buf_desc *jd, char *path)
672{
673 int ret;
674
675 if (verbose > 0)
676 fprintf(stderr, "injecting: %s\n", path);
677
678 ret = jit_open(jd, path);
679 if (ret)
680 return -1;
681
682 ret = jit_process_dump(jd);
683
684 jit_close(jd);
685
686 if (verbose > 0)
687 fprintf(stderr, "injected: %s (%d)\n", path, ret);
688
689 return 0;
690}
691
692/*
693 * File must be with pattern .../jit-XXXX.dump
694 * where XXXX is the PID of the process which did the mmap()
695 * as captured in the RECORD_MMAP record
696 */
697static int
698jit_detect(char *mmap_name, pid_t pid)
699 {
700 char *p;
701 char *end = NULL;
702 pid_t pid2;
703
704 if (verbose > 2)
705 fprintf(stderr, "jit marker trying : %s\n", mmap_name);
706 /*
707 * get file name
708 */
709 p = strrchr(mmap_name, '/');
710 if (!p)
711 return -1;
712
713 /*
714 * match prefix
715 */
716 if (strncmp(p, "/jit-", 5))
717 return -1;
718
719 /*
720 * skip prefix
721 */
722 p += 5;
723
724 /*
725 * must be followed by a pid
726 */
727 if (!isdigit(*p))
728 return -1;
729
730 pid2 = (int)strtol(p, &end, 10);
731 if (!end)
732 return -1;
733
734 /*
735 * pid does not match mmap pid
736 * pid==0 in system-wide mode (synthesized)
737 */
738 if (pid && pid2 != pid)
739 return -1;
740 /*
741 * validate suffix
742 */
743 if (strcmp(end, ".dump"))
744 return -1;
745
746 if (verbose > 0)
747 fprintf(stderr, "jit marker found: %s\n", mmap_name);
748
749 return 0;
750}
751
752int
753jit_process(struct perf_session *session,
754 struct perf_data *output,
755 struct machine *machine,
756 char *filename,
757 pid_t pid,
758 u64 *nbytes)
759{
760 struct evsel *first;
761 struct jit_buf_desc jd;
762 int ret;
763
764 /*
765 * first, detect marker mmap (i.e., the jitdump mmap)
766 */
767 if (jit_detect(filename, pid))
768 return 0;
769
770 memset(&jd, 0, sizeof(jd));
771
772 jd.session = session;
773 jd.output = output;
774 jd.machine = machine;
775
776 /*
777 * track sample_type to compute id_all layout
778 * perf sets the same sample type to all events as of now
779 */
780 first = evlist__first(session->evlist);
781 jd.sample_type = first->core.attr.sample_type;
782
783 *nbytes = 0;
784
785 ret = jit_inject(&jd, filename);
786 if (!ret) {
787 *nbytes = jd.bytes_written;
788 ret = 1;
789 }
790
791 return ret;
792}
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
35struct 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
59struct 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
66struct 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
76static int
77jit_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
118static void
119jit_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
128static int
129jit_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
143static int
144jit_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;
247error:
248 funlockfile(jd->in);
249 fclose(jd->in);
250 return retval;
251}
252
253static union jr_entry *
254jit_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
370static int
371jit_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
383static 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
390static 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
397static uint64_t convert_timestamp(struct jit_buf_desc *jd, uint64_t timestamp)
398{
399 struct perf_tsc_conversion tc = { .time_shift = 0, };
400 struct perf_record_time_conv *time_conv = &jd->session->time_conv;
401
402 if (!jd->use_arch_timestamp)
403 return timestamp;
404
405 tc.time_shift = time_conv->time_shift;
406 tc.time_mult = time_conv->time_mult;
407 tc.time_zero = time_conv->time_zero;
408
409 /*
410 * The event TIME_CONV was extended for the fields from "time_cycles"
411 * when supported cap_user_time_short, for backward compatibility,
412 * checks the event size and assigns these extended fields if these
413 * fields are contained in the event.
414 */
415 if (event_contains(*time_conv, time_cycles)) {
416 tc.time_cycles = time_conv->time_cycles;
417 tc.time_mask = time_conv->time_mask;
418 tc.cap_user_time_zero = time_conv->cap_user_time_zero;
419 tc.cap_user_time_short = time_conv->cap_user_time_short;
420
421 if (!tc.cap_user_time_zero)
422 return 0;
423 }
424
425 return tsc_to_perf_time(timestamp, &tc);
426}
427
428static int jit_repipe_code_load(struct jit_buf_desc *jd, union jr_entry *jr)
429{
430 struct perf_sample sample;
431 union perf_event *event;
432 struct perf_tool *tool = jd->session->tool;
433 uint64_t code, addr;
434 uintptr_t uaddr;
435 char *filename;
436 struct stat st;
437 size_t size;
438 u16 idr_size;
439 const char *sym;
440 uint64_t count;
441 int ret, csize, usize;
442 pid_t nspid, pid, tid;
443 struct {
444 u32 pid, tid;
445 u64 time;
446 } *id;
447
448 nspid = jr->load.pid;
449 pid = jr_entry_pid(jd, jr);
450 tid = jr_entry_tid(jd, jr);
451 csize = jr->load.code_size;
452 usize = jd->unwinding_mapped_size;
453 addr = jr->load.code_addr;
454 sym = (void *)((unsigned long)jr + sizeof(jr->load));
455 code = (unsigned long)jr + jr->load.p.total_size - csize;
456 count = jr->load.code_index;
457 idr_size = jd->machine->id_hdr_size;
458
459 event = calloc(1, sizeof(*event) + idr_size);
460 if (!event)
461 return -1;
462
463 filename = event->mmap2.filename;
464 size = snprintf(filename, PATH_MAX, "%s/jitted-%d-%" PRIu64 ".so",
465 jd->dir,
466 nspid,
467 count);
468
469 size++; /* for \0 */
470
471 size = PERF_ALIGN(size, sizeof(u64));
472 uaddr = (uintptr_t)code;
473 ret = jit_emit_elf(jd, filename, sym, addr, (const void *)uaddr, csize, jd->debug_data, jd->nr_debug_entries,
474 jd->unwinding_data, jd->eh_frame_hdr_size, jd->unwinding_size);
475
476 if (jd->debug_data && jd->nr_debug_entries) {
477 zfree(&jd->debug_data);
478 jd->nr_debug_entries = 0;
479 }
480
481 if (jd->unwinding_data && jd->eh_frame_hdr_size) {
482 zfree(&jd->unwinding_data);
483 jd->eh_frame_hdr_size = 0;
484 jd->unwinding_mapped_size = 0;
485 jd->unwinding_size = 0;
486 }
487
488 if (ret) {
489 free(event);
490 return -1;
491 }
492 if (nsinfo__stat(filename, &st, jd->nsi))
493 memset(&st, 0, sizeof(st));
494
495 event->mmap2.header.type = PERF_RECORD_MMAP2;
496 event->mmap2.header.misc = PERF_RECORD_MISC_USER;
497 event->mmap2.header.size = (sizeof(event->mmap2) -
498 (sizeof(event->mmap2.filename) - size) + idr_size);
499
500 event->mmap2.pgoff = GEN_ELF_TEXT_OFFSET;
501 event->mmap2.start = addr;
502 event->mmap2.len = usize ? ALIGN_8(csize) + usize : csize;
503 event->mmap2.pid = pid;
504 event->mmap2.tid = tid;
505 event->mmap2.ino = st.st_ino;
506 event->mmap2.maj = major(st.st_dev);
507 event->mmap2.min = minor(st.st_dev);
508 event->mmap2.prot = st.st_mode;
509 event->mmap2.flags = MAP_SHARED;
510 event->mmap2.ino_generation = 1;
511
512 id = (void *)((unsigned long)event + event->mmap.header.size - idr_size);
513 if (jd->sample_type & PERF_SAMPLE_TID) {
514 id->pid = pid;
515 id->tid = tid;
516 }
517 if (jd->sample_type & PERF_SAMPLE_TIME)
518 id->time = convert_timestamp(jd, jr->load.p.timestamp);
519
520 /*
521 * create pseudo sample to induce dso hit increment
522 * use first address as sample address
523 */
524 memset(&sample, 0, sizeof(sample));
525 sample.cpumode = PERF_RECORD_MISC_USER;
526 sample.pid = pid;
527 sample.tid = tid;
528 sample.time = id->time;
529 sample.ip = addr;
530
531 ret = perf_event__process_mmap2(tool, event, &sample, jd->machine);
532 if (ret)
533 return ret;
534
535 ret = jit_inject_event(jd, event);
536 /*
537 * mark dso as use to generate buildid in the header
538 */
539 if (!ret)
540 build_id__mark_dso_hit(tool, event, &sample, NULL, jd->machine);
541
542 return ret;
543}
544
545static int jit_repipe_code_move(struct jit_buf_desc *jd, union jr_entry *jr)
546{
547 struct perf_sample sample;
548 union perf_event *event;
549 struct perf_tool *tool = jd->session->tool;
550 char *filename;
551 size_t size;
552 struct stat st;
553 int usize;
554 u16 idr_size;
555 int ret;
556 pid_t nspid, pid, tid;
557 struct {
558 u32 pid, tid;
559 u64 time;
560 } *id;
561
562 nspid = jr->load.pid;
563 pid = jr_entry_pid(jd, jr);
564 tid = jr_entry_tid(jd, jr);
565 usize = jd->unwinding_mapped_size;
566 idr_size = jd->machine->id_hdr_size;
567
568 /*
569 * +16 to account for sample_id_all (hack)
570 */
571 event = calloc(1, sizeof(*event) + 16);
572 if (!event)
573 return -1;
574
575 filename = event->mmap2.filename;
576 size = snprintf(filename, PATH_MAX, "%s/jitted-%d-%" PRIu64 ".so",
577 jd->dir,
578 nspid,
579 jr->move.code_index);
580
581 size++; /* for \0 */
582
583 if (nsinfo__stat(filename, &st, jd->nsi))
584 memset(&st, 0, sizeof(st));
585
586 size = PERF_ALIGN(size, sizeof(u64));
587
588 event->mmap2.header.type = PERF_RECORD_MMAP2;
589 event->mmap2.header.misc = PERF_RECORD_MISC_USER;
590 event->mmap2.header.size = (sizeof(event->mmap2) -
591 (sizeof(event->mmap2.filename) - size) + idr_size);
592 event->mmap2.pgoff = GEN_ELF_TEXT_OFFSET;
593 event->mmap2.start = jr->move.new_code_addr;
594 event->mmap2.len = usize ? ALIGN_8(jr->move.code_size) + usize
595 : jr->move.code_size;
596 event->mmap2.pid = pid;
597 event->mmap2.tid = tid;
598 event->mmap2.ino = st.st_ino;
599 event->mmap2.maj = major(st.st_dev);
600 event->mmap2.min = minor(st.st_dev);
601 event->mmap2.prot = st.st_mode;
602 event->mmap2.flags = MAP_SHARED;
603 event->mmap2.ino_generation = 1;
604
605 id = (void *)((unsigned long)event + event->mmap.header.size - idr_size);
606 if (jd->sample_type & PERF_SAMPLE_TID) {
607 id->pid = pid;
608 id->tid = tid;
609 }
610 if (jd->sample_type & PERF_SAMPLE_TIME)
611 id->time = convert_timestamp(jd, jr->load.p.timestamp);
612
613 /*
614 * create pseudo sample to induce dso hit increment
615 * use first address as sample address
616 */
617 memset(&sample, 0, sizeof(sample));
618 sample.cpumode = PERF_RECORD_MISC_USER;
619 sample.pid = pid;
620 sample.tid = tid;
621 sample.time = id->time;
622 sample.ip = jr->move.new_code_addr;
623
624 ret = perf_event__process_mmap2(tool, event, &sample, jd->machine);
625 if (ret)
626 return ret;
627
628 ret = jit_inject_event(jd, event);
629 if (!ret)
630 build_id__mark_dso_hit(tool, event, &sample, NULL, jd->machine);
631
632 return ret;
633}
634
635static int jit_repipe_debug_info(struct jit_buf_desc *jd, union jr_entry *jr)
636{
637 void *data;
638 size_t sz;
639
640 if (!(jd && jr))
641 return -1;
642
643 sz = jr->prefix.total_size - sizeof(jr->info);
644 data = malloc(sz);
645 if (!data)
646 return -1;
647
648 memcpy(data, &jr->info.entries, sz);
649
650 jd->debug_data = data;
651
652 /*
653 * we must use nr_entry instead of size here because
654 * we cannot distinguish actual entry from padding otherwise
655 */
656 jd->nr_debug_entries = jr->info.nr_entry;
657
658 return 0;
659}
660
661static int
662jit_repipe_unwinding_info(struct jit_buf_desc *jd, union jr_entry *jr)
663{
664 void *unwinding_data;
665 uint32_t unwinding_data_size;
666
667 if (!(jd && jr))
668 return -1;
669
670 unwinding_data_size = jr->prefix.total_size - sizeof(jr->unwinding);
671 unwinding_data = malloc(unwinding_data_size);
672 if (!unwinding_data)
673 return -1;
674
675 memcpy(unwinding_data, &jr->unwinding.unwinding_data,
676 unwinding_data_size);
677
678 jd->eh_frame_hdr_size = jr->unwinding.eh_frame_hdr_size;
679 jd->unwinding_size = jr->unwinding.unwinding_size;
680 jd->unwinding_mapped_size = jr->unwinding.mapped_size;
681 jd->unwinding_data = unwinding_data;
682
683 return 0;
684}
685
686static int
687jit_process_dump(struct jit_buf_desc *jd)
688{
689 union jr_entry *jr;
690 int ret = 0;
691
692 while ((jr = jit_get_next_entry(jd))) {
693 switch(jr->prefix.id) {
694 case JIT_CODE_LOAD:
695 ret = jit_repipe_code_load(jd, jr);
696 break;
697 case JIT_CODE_MOVE:
698 ret = jit_repipe_code_move(jd, jr);
699 break;
700 case JIT_CODE_DEBUG_INFO:
701 ret = jit_repipe_debug_info(jd, jr);
702 break;
703 case JIT_CODE_UNWINDING_INFO:
704 ret = jit_repipe_unwinding_info(jd, jr);
705 break;
706 default:
707 ret = 0;
708 continue;
709 }
710 }
711 return ret;
712}
713
714static int
715jit_inject(struct jit_buf_desc *jd, char *path)
716{
717 int ret;
718
719 if (verbose > 0)
720 fprintf(stderr, "injecting: %s\n", path);
721
722 ret = jit_open(jd, path);
723 if (ret)
724 return -1;
725
726 ret = jit_process_dump(jd);
727
728 jit_close(jd);
729
730 if (verbose > 0)
731 fprintf(stderr, "injected: %s (%d)\n", path, ret);
732
733 return 0;
734}
735
736/*
737 * File must be with pattern .../jit-XXXX.dump
738 * where XXXX is the PID of the process which did the mmap()
739 * as captured in the RECORD_MMAP record
740 */
741static int
742jit_detect(char *mmap_name, pid_t pid, struct nsinfo *nsi)
743 {
744 char *p;
745 char *end = NULL;
746 pid_t pid2;
747
748 if (verbose > 2)
749 fprintf(stderr, "jit marker trying : %s\n", mmap_name);
750 /*
751 * get file name
752 */
753 p = strrchr(mmap_name, '/');
754 if (!p)
755 return -1;
756
757 /*
758 * match prefix
759 */
760 if (strncmp(p, "/jit-", 5))
761 return -1;
762
763 /*
764 * skip prefix
765 */
766 p += 5;
767
768 /*
769 * must be followed by a pid
770 */
771 if (!isdigit(*p))
772 return -1;
773
774 pid2 = (int)strtol(p, &end, 10);
775 if (!end)
776 return -1;
777
778 /*
779 * pid does not match mmap pid
780 * pid==0 in system-wide mode (synthesized)
781 */
782 if (pid && pid2 != nsi->nstgid)
783 return -1;
784 /*
785 * validate suffix
786 */
787 if (strcmp(end, ".dump"))
788 return -1;
789
790 if (verbose > 0)
791 fprintf(stderr, "jit marker found: %s\n", mmap_name);
792
793 return 0;
794}
795
796static void jit_add_pid(struct machine *machine, pid_t pid)
797{
798 struct thread *thread = machine__findnew_thread(machine, pid, pid);
799
800 if (!thread) {
801 pr_err("%s: thread %d not found or created\n", __func__, pid);
802 return;
803 }
804
805 thread->priv = (void *)1;
806}
807
808static bool jit_has_pid(struct machine *machine, pid_t pid)
809{
810 struct thread *thread = machine__find_thread(machine, pid, pid);
811
812 if (!thread)
813 return 0;
814
815 return (bool)thread->priv;
816}
817
818int
819jit_process(struct perf_session *session,
820 struct perf_data *output,
821 struct machine *machine,
822 char *filename,
823 pid_t pid,
824 pid_t tid,
825 u64 *nbytes)
826{
827 struct thread *thread;
828 struct nsinfo *nsi;
829 struct evsel *first;
830 struct jit_buf_desc jd;
831 int ret;
832
833 thread = machine__findnew_thread(machine, pid, tid);
834 if (thread == NULL) {
835 pr_err("problem processing JIT mmap event, skipping it.\n");
836 return 0;
837 }
838
839 nsi = nsinfo__get(thread->nsinfo);
840 thread__put(thread);
841
842 /*
843 * first, detect marker mmap (i.e., the jitdump mmap)
844 */
845 if (jit_detect(filename, pid, nsi)) {
846 nsinfo__put(nsi);
847
848 // Strip //anon* mmaps if we processed a jitdump for this pid
849 if (jit_has_pid(machine, pid) && (strncmp(filename, "//anon", 6) == 0))
850 return 1;
851
852 return 0;
853 }
854
855 memset(&jd, 0, sizeof(jd));
856
857 jd.session = session;
858 jd.output = output;
859 jd.machine = machine;
860 jd.nsi = nsi;
861
862 /*
863 * track sample_type to compute id_all layout
864 * perf sets the same sample type to all events as of now
865 */
866 first = evlist__first(session->evlist);
867 jd.sample_type = first->core.attr.sample_type;
868
869 *nbytes = 0;
870
871 ret = jit_inject(&jd, filename);
872 if (!ret) {
873 jit_add_pid(machine, pid);
874 *nbytes = jd.bytes_written;
875 ret = 1;
876 }
877
878 nsinfo__put(jd.nsi);
879
880 return ret;
881}