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