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TOMOYO Linux Cross Reference
Linux/tools/perf/util/jitdump.c

Version: ~ [ linux-5.4-rc3 ] ~ [ linux-5.3.6 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.79 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.149 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.196 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.196 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.75 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 
 32 struct 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 
 55 struct 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 
 62 struct 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 
 72 static int
 73 jit_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 
106 static void
107 jit_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 
116 static int
117 jit_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 
131 static int
132 jit_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;
232 error:
233         funlockfile(jd->in);
234         fclose(jd->in);
235         return retval;
236 }
237 
238 static union jr_entry *
239 jit_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 
355 static int
356 jit_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 
368 static 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 
385 static 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 
503 static 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 
592 static 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 
618 static int
619 jit_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 
643 static int
644 jit_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 
671 static int
672 jit_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  */
698 static int
699 jit_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 
753 int
754 jit_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 }
794 

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