Linux Perf
unwind-libunwind-local.c
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1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Post mortem Dwarf CFI based unwinding on top of regs and stack dumps.
4  *
5  * Lots of this code have been borrowed or heavily inspired from parts of
6  * the libunwind 0.99 code which are (amongst other contributors I may have
7  * forgotten):
8  *
9  * Copyright (C) 2002-2007 Hewlett-Packard Co
10  * Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
11  *
12  * And the bugs have been added by:
13  *
14  * Copyright (C) 2010, Frederic Weisbecker <fweisbec@gmail.com>
15  * Copyright (C) 2012, Jiri Olsa <jolsa@redhat.com>
16  *
17  */
18 
19 #include <elf.h>
20 #include <errno.h>
21 #include <gelf.h>
22 #include <fcntl.h>
23 #include <inttypes.h>
24 #include <string.h>
25 #include <unistd.h>
26 #include <sys/mman.h>
27 #include <linux/list.h>
28 #ifndef REMOTE_UNWIND_LIBUNWIND
29 #include <libunwind.h>
30 #include <libunwind-ptrace.h>
31 #endif
32 #include "callchain.h"
33 #include "thread.h"
34 #include "session.h"
35 #include "perf_regs.h"
36 #include "unwind.h"
37 #include "symbol.h"
38 #include "util.h"
39 #include "debug.h"
40 #include "asm/bug.h"
41 #include "dso.h"
42 
43 extern int
44 UNW_OBJ(dwarf_search_unwind_table) (unw_addr_space_t as,
45  unw_word_t ip,
46  unw_dyn_info_t *di,
47  unw_proc_info_t *pi,
48  int need_unwind_info, void *arg);
49 
50 #define dwarf_search_unwind_table UNW_OBJ(dwarf_search_unwind_table)
51 
52 extern int
53 UNW_OBJ(dwarf_find_debug_frame) (int found, unw_dyn_info_t *di_debug,
54  unw_word_t ip,
55  unw_word_t segbase,
56  const char *obj_name, unw_word_t start,
57  unw_word_t end);
58 
59 #define dwarf_find_debug_frame UNW_OBJ(dwarf_find_debug_frame)
60 
61 #define DW_EH_PE_FORMAT_MASK 0x0f /* format of the encoded value */
62 #define DW_EH_PE_APPL_MASK 0x70 /* how the value is to be applied */
63 
64 /* Pointer-encoding formats: */
65 #define DW_EH_PE_omit 0xff
66 #define DW_EH_PE_ptr 0x00 /* pointer-sized unsigned value */
67 #define DW_EH_PE_udata4 0x03 /* unsigned 32-bit value */
68 #define DW_EH_PE_udata8 0x04 /* unsigned 64-bit value */
69 #define DW_EH_PE_sdata4 0x0b /* signed 32-bit value */
70 #define DW_EH_PE_sdata8 0x0c /* signed 64-bit value */
71 
72 /* Pointer-encoding application: */
73 #define DW_EH_PE_absptr 0x00 /* absolute value */
74 #define DW_EH_PE_pcrel 0x10 /* rel. to addr. of encoded value */
75 
76 /*
77  * The following are not documented by LSB v1.3, yet they are used by
78  * GCC, presumably they aren't documented by LSB since they aren't
79  * used on Linux:
80  */
81 #define DW_EH_PE_funcrel 0x40 /* start-of-procedure-relative */
82 #define DW_EH_PE_aligned 0x50 /* aligned pointer */
83 
84 /* Flags intentionaly not handled, since they're not needed:
85  * #define DW_EH_PE_indirect 0x80
86  * #define DW_EH_PE_uleb128 0x01
87  * #define DW_EH_PE_udata2 0x02
88  * #define DW_EH_PE_sleb128 0x09
89  * #define DW_EH_PE_sdata2 0x0a
90  * #define DW_EH_PE_textrel 0x20
91  * #define DW_EH_PE_datarel 0x30
92  */
93 
94 struct unwind_info {
95  struct perf_sample *sample;
96  struct machine *machine;
97  struct thread *thread;
98 };
99 
100 #define dw_read(ptr, type, end) ({ \
101  type *__p = (type *) ptr; \
102  type __v; \
103  if ((__p + 1) > (type *) end) \
104  return -EINVAL; \
105  __v = *__p++; \
106  ptr = (typeof(ptr)) __p; \
107  __v; \
108  })
109 
110 static int __dw_read_encoded_value(u8 **p, u8 *end, u64 *val,
111  u8 encoding)
112 {
113  u8 *cur = *p;
114  *val = 0;
115 
116  switch (encoding) {
117  case DW_EH_PE_omit:
118  *val = 0;
119  goto out;
120  case DW_EH_PE_ptr:
121  *val = dw_read(cur, unsigned long, end);
122  goto out;
123  default:
124  break;
125  }
126 
127  switch (encoding & DW_EH_PE_APPL_MASK) {
128  case DW_EH_PE_absptr:
129  break;
130  case DW_EH_PE_pcrel:
131  *val = (unsigned long) cur;
132  break;
133  default:
134  return -EINVAL;
135  }
136 
137  if ((encoding & 0x07) == 0x00)
138  encoding |= DW_EH_PE_udata4;
139 
140  switch (encoding & DW_EH_PE_FORMAT_MASK) {
141  case DW_EH_PE_sdata4:
142  *val += dw_read(cur, s32, end);
143  break;
144  case DW_EH_PE_udata4:
145  *val += dw_read(cur, u32, end);
146  break;
147  case DW_EH_PE_sdata8:
148  *val += dw_read(cur, s64, end);
149  break;
150  case DW_EH_PE_udata8:
151  *val += dw_read(cur, u64, end);
152  break;
153  default:
154  return -EINVAL;
155  }
156 
157  out:
158  *p = cur;
159  return 0;
160 }
161 
162 #define dw_read_encoded_value(ptr, end, enc) ({ \
163  u64 __v; \
164  if (__dw_read_encoded_value(&ptr, end, &__v, enc)) { \
165  return -EINVAL; \
166  } \
167  __v; \
168  })
169 
170 static u64 elf_section_offset(int fd, const char *name)
171 {
172  Elf *elf;
173  GElf_Ehdr ehdr;
174  GElf_Shdr shdr;
175  u64 offset = 0;
176 
177  elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
178  if (elf == NULL)
179  return 0;
180 
181  do {
182  if (gelf_getehdr(elf, &ehdr) == NULL)
183  break;
184 
185  if (!elf_section_by_name(elf, &ehdr, &shdr, name, NULL))
186  break;
187 
188  offset = shdr.sh_offset;
189  } while (0);
190 
191  elf_end(elf);
192  return offset;
193 }
194 
195 #ifndef NO_LIBUNWIND_DEBUG_FRAME
196 static int elf_is_exec(int fd, const char *name)
197 {
198  Elf *elf;
199  GElf_Ehdr ehdr;
200  int retval = 0;
201 
202  elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
203  if (elf == NULL)
204  return 0;
205  if (gelf_getehdr(elf, &ehdr) == NULL)
206  goto out;
207 
208  retval = (ehdr.e_type == ET_EXEC);
209 
210 out:
211  elf_end(elf);
212  pr_debug("unwind: elf_is_exec(%s): %d\n", name, retval);
213  return retval;
214 }
215 #endif
216 
217 struct table_entry {
220 };
221 
222 struct eh_frame_hdr {
223  unsigned char version;
224  unsigned char eh_frame_ptr_enc;
225  unsigned char fde_count_enc;
226  unsigned char table_enc;
227 
228  /*
229  * The rest of the header is variable-length and consists of the
230  * following members:
231  *
232  * encoded_t eh_frame_ptr;
233  * encoded_t fde_count;
234  */
235 
236  /* A single encoded pointer should not be more than 8 bytes. */
237  u64 enc[2];
238 
239  /*
240  * struct {
241  * encoded_t start_ip;
242  * encoded_t fde_addr;
243  * } binary_search_table[fde_count];
244  */
245  char data[0];
246 } __packed;
247 
248 static int unwind_spec_ehframe(struct dso *dso, struct machine *machine,
249  u64 offset, u64 *table_data, u64 *segbase,
250  u64 *fde_count)
251 {
252  struct eh_frame_hdr hdr;
253  u8 *enc = (u8 *) &hdr.enc;
254  u8 *end = (u8 *) &hdr.data;
255  ssize_t r;
256 
257  r = dso__data_read_offset(dso, machine, offset,
258  (u8 *) &hdr, sizeof(hdr));
259  if (r != sizeof(hdr))
260  return -EINVAL;
261 
262  /* We dont need eh_frame_ptr, just skip it. */
263  dw_read_encoded_value(enc, end, hdr.eh_frame_ptr_enc);
264 
265  *fde_count = dw_read_encoded_value(enc, end, hdr.fde_count_enc);
266  *segbase = offset;
267  *table_data = (enc - (u8 *) &hdr) + offset;
268  return 0;
269 }
270 
271 static int read_unwind_spec_eh_frame(struct dso *dso, struct machine *machine,
272  u64 *table_data, u64 *segbase,
273  u64 *fde_count)
274 {
275  int ret = -EINVAL, fd;
276  u64 offset = dso->data.eh_frame_hdr_offset;
277 
278  if (offset == 0) {
279  fd = dso__data_get_fd(dso, machine);
280  if (fd < 0)
281  return -EINVAL;
282 
283  /* Check the .eh_frame section for unwinding info */
284  offset = elf_section_offset(fd, ".eh_frame_hdr");
285  dso->data.eh_frame_hdr_offset = offset;
286  dso__data_put_fd(dso);
287  }
288 
289  if (offset)
290  ret = unwind_spec_ehframe(dso, machine, offset,
291  table_data, segbase,
292  fde_count);
293 
294  return ret;
295 }
296 
297 #ifndef NO_LIBUNWIND_DEBUG_FRAME
299  struct machine *machine, u64 *offset)
300 {
301  int fd;
302  u64 ofs = dso->data.debug_frame_offset;
303 
304  /* debug_frame can reside in:
305  * - dso
306  * - debug pointed by symsrc_filename
307  * - gnu_debuglink, which doesn't necessary
308  * has to be pointed by symsrc_filename
309  */
310  if (ofs == 0) {
311  fd = dso__data_get_fd(dso, machine);
312  if (fd >= 0) {
313  ofs = elf_section_offset(fd, ".debug_frame");
314  dso__data_put_fd(dso);
315  }
316 
317  if (ofs <= 0) {
318  fd = open(dso->symsrc_filename, O_RDONLY);
319  if (fd >= 0) {
320  ofs = elf_section_offset(fd, ".debug_frame");
321  close(fd);
322  }
323  }
324 
325  if (ofs <= 0) {
326  char *debuglink = malloc(PATH_MAX);
327  int ret = 0;
328 
331  machine->root_dir, debuglink, PATH_MAX);
332  if (!ret) {
333  fd = open(debuglink, O_RDONLY);
334  if (fd >= 0) {
335  ofs = elf_section_offset(fd,
336  ".debug_frame");
337  close(fd);
338  }
339  }
340  if (ofs > 0) {
341  if (dso->symsrc_filename != NULL) {
342  pr_warning(
343  "%s: overwrite symsrc(%s,%s)\n",
344  __func__,
345  dso->symsrc_filename,
346  debuglink);
347  free(dso->symsrc_filename);
348  }
349  dso->symsrc_filename = debuglink;
350  } else {
351  free(debuglink);
352  }
353  }
354 
355  dso->data.debug_frame_offset = ofs;
356  }
357 
358  *offset = ofs;
359  if (*offset)
360  return 0;
361 
362  return -EINVAL;
363 }
364 #endif
365 
366 static struct map *find_map(unw_word_t ip, struct unwind_info *ui)
367 {
368  struct addr_location al;
369  return thread__find_map(ui->thread, PERF_RECORD_MISC_USER, ip, &al);
370 }
371 
372 static int
373 find_proc_info(unw_addr_space_t as, unw_word_t ip, unw_proc_info_t *pi,
374  int need_unwind_info, void *arg)
375 {
376  struct unwind_info *ui = arg;
377  struct map *map;
378  unw_dyn_info_t di;
379  u64 table_data, segbase, fde_count;
380  int ret = -EINVAL;
381 
382  map = find_map(ip, ui);
383  if (!map || !map->dso)
384  return -EINVAL;
385 
386  pr_debug("unwind: find_proc_info dso %s\n", map->dso->name);
387 
388  /* Check the .eh_frame section for unwinding info */
389  if (!read_unwind_spec_eh_frame(map->dso, ui->machine,
390  &table_data, &segbase, &fde_count)) {
391  memset(&di, 0, sizeof(di));
392  di.format = UNW_INFO_FORMAT_REMOTE_TABLE;
393  di.start_ip = map->start;
394  di.end_ip = map->end;
395  di.u.rti.segbase = map->start + segbase - map->pgoff;
396  di.u.rti.table_data = map->start + table_data - map->pgoff;
397  di.u.rti.table_len = fde_count * sizeof(struct table_entry)
398  / sizeof(unw_word_t);
399  ret = dwarf_search_unwind_table(as, ip, &di, pi,
400  need_unwind_info, arg);
401  }
402 
403 #ifndef NO_LIBUNWIND_DEBUG_FRAME
404  /* Check the .debug_frame section for unwinding info */
405  if (ret < 0 &&
406  !read_unwind_spec_debug_frame(map->dso, ui->machine, &segbase)) {
407  int fd = dso__data_get_fd(map->dso, ui->machine);
408  int is_exec = elf_is_exec(fd, map->dso->name);
409  unw_word_t base = is_exec ? 0 : map->start;
410  const char *symfile;
411 
412  if (fd >= 0)
413  dso__data_put_fd(map->dso);
414 
415  symfile = map->dso->symsrc_filename ?: map->dso->name;
416 
417  memset(&di, 0, sizeof(di));
418  if (dwarf_find_debug_frame(0, &di, ip, base, symfile,
419  map->start, map->end))
420  return dwarf_search_unwind_table(as, ip, &di, pi,
421  need_unwind_info, arg);
422  }
423 #endif
424 
425  return ret;
426 }
427 
428 static int access_fpreg(unw_addr_space_t __maybe_unused as,
429  unw_regnum_t __maybe_unused num,
430  unw_fpreg_t __maybe_unused *val,
431  int __maybe_unused __write,
432  void __maybe_unused *arg)
433 {
434  pr_err("unwind: access_fpreg unsupported\n");
435  return -UNW_EINVAL;
436 }
437 
438 static int get_dyn_info_list_addr(unw_addr_space_t __maybe_unused as,
439  unw_word_t __maybe_unused *dil_addr,
440  void __maybe_unused *arg)
441 {
442  return -UNW_ENOINFO;
443 }
444 
445 static int resume(unw_addr_space_t __maybe_unused as,
446  unw_cursor_t __maybe_unused *cu,
447  void __maybe_unused *arg)
448 {
449  pr_err("unwind: resume unsupported\n");
450  return -UNW_EINVAL;
451 }
452 
453 static int
454 get_proc_name(unw_addr_space_t __maybe_unused as,
455  unw_word_t __maybe_unused addr,
456  char __maybe_unused *bufp, size_t __maybe_unused buf_len,
457  unw_word_t __maybe_unused *offp, void __maybe_unused *arg)
458 {
459  pr_err("unwind: get_proc_name unsupported\n");
460  return -UNW_EINVAL;
461 }
462 
463 static int access_dso_mem(struct unwind_info *ui, unw_word_t addr,
464  unw_word_t *data)
465 {
466  struct map *map;
467  ssize_t size;
468 
469  map = find_map(addr, ui);
470  if (!map) {
471  pr_debug("unwind: no map for %lx\n", (unsigned long)addr);
472  return -1;
473  }
474 
475  if (!map->dso)
476  return -1;
477 
478  size = dso__data_read_addr(map->dso, map, ui->machine,
479  addr, (u8 *) data, sizeof(*data));
480 
481  return !(size == sizeof(*data));
482 }
483 
484 static int access_mem(unw_addr_space_t __maybe_unused as,
485  unw_word_t addr, unw_word_t *valp,
486  int __write, void *arg)
487 {
488  struct unwind_info *ui = arg;
489  struct stack_dump *stack = &ui->sample->user_stack;
490  u64 start, end;
491  int offset;
492  int ret;
493 
494  /* Don't support write, probably not needed. */
495  if (__write || !stack || !ui->sample->user_regs.regs) {
496  *valp = 0;
497  return 0;
498  }
499 
500  ret = perf_reg_value(&start, &ui->sample->user_regs,
502  if (ret)
503  return ret;
504 
505  end = start + stack->size;
506 
507  /* Check overflow. */
508  if (addr + sizeof(unw_word_t) < addr)
509  return -EINVAL;
510 
511  if (addr < start || addr + sizeof(unw_word_t) >= end) {
512  ret = access_dso_mem(ui, addr, valp);
513  if (ret) {
514  pr_debug("unwind: access_mem %p not inside range"
515  " 0x%" PRIx64 "-0x%" PRIx64 "\n",
516  (void *) (uintptr_t) addr, start, end);
517  *valp = 0;
518  return ret;
519  }
520  return 0;
521  }
522 
523  offset = addr - start;
524  *valp = *(unw_word_t *)&stack->data[offset];
525  pr_debug("unwind: access_mem addr %p val %lx, offset %d\n",
526  (void *) (uintptr_t) addr, (unsigned long)*valp, offset);
527  return 0;
528 }
529 
530 static int access_reg(unw_addr_space_t __maybe_unused as,
531  unw_regnum_t regnum, unw_word_t *valp,
532  int __write, void *arg)
533 {
534  struct unwind_info *ui = arg;
535  int id, ret;
536  u64 val;
537 
538  /* Don't support write, I suspect we don't need it. */
539  if (__write) {
540  pr_err("unwind: access_reg w %d\n", regnum);
541  return 0;
542  }
543 
544  if (!ui->sample->user_regs.regs) {
545  *valp = 0;
546  return 0;
547  }
548 
549  id = LIBUNWIND__ARCH_REG_ID(regnum);
550  if (id < 0)
551  return -EINVAL;
552 
553  ret = perf_reg_value(&val, &ui->sample->user_regs, id);
554  if (ret) {
555  pr_err("unwind: can't read reg %d\n", regnum);
556  return ret;
557  }
558 
559  *valp = (unw_word_t) val;
560  pr_debug("unwind: reg %d, val %lx\n", regnum, (unsigned long)*valp);
561  return 0;
562 }
563 
564 static void put_unwind_info(unw_addr_space_t __maybe_unused as,
565  unw_proc_info_t *pi __maybe_unused,
566  void *arg __maybe_unused)
567 {
568  pr_debug("unwind: put_unwind_info called\n");
569 }
570 
571 static int entry(u64 ip, struct thread *thread,
572  unwind_entry_cb_t cb, void *arg)
573 {
574  struct unwind_entry e;
575  struct addr_location al;
576 
577  e.sym = thread__find_symbol(thread, PERF_RECORD_MISC_USER, ip, &al);
578  e.ip = al.addr;
579  e.map = al.map;
580 
581  pr_debug("unwind: %s:ip = 0x%" PRIx64 " (0x%" PRIx64 ")\n",
582  al.sym ? al.sym->name : "''",
583  ip,
584  al.map ? al.map->map_ip(al.map, ip) : (u64) 0);
585 
586  return cb(&e, arg);
587 }
588 
589 static void display_error(int err)
590 {
591  switch (err) {
592  case UNW_EINVAL:
593  pr_err("unwind: Only supports local.\n");
594  break;
595  case UNW_EUNSPEC:
596  pr_err("unwind: Unspecified error.\n");
597  break;
598  case UNW_EBADREG:
599  pr_err("unwind: Register unavailable.\n");
600  break;
601  default:
602  break;
603  }
604 }
605 
606 static unw_accessors_t accessors = {
607  .find_proc_info = find_proc_info,
608  .put_unwind_info = put_unwind_info,
609  .get_dyn_info_list_addr = get_dyn_info_list_addr,
610  .access_mem = access_mem,
611  .access_reg = access_reg,
612  .access_fpreg = access_fpreg,
613  .resume = resume,
614  .get_proc_name = get_proc_name,
615 };
616 
618 {
620  return 0;
621  thread->addr_space = unw_create_addr_space(&accessors, 0);
622  if (!thread->addr_space) {
623  pr_err("unwind: Can't create unwind address space.\n");
624  return -ENOMEM;
625  }
626 
627  unw_set_caching_policy(thread->addr_space, UNW_CACHE_GLOBAL);
628  return 0;
629 }
630 
631 static void _unwind__flush_access(struct thread *thread)
632 {
634  return;
635  unw_flush_cache(thread->addr_space, 0, 0);
636 }
637 
639 {
641  return;
642  unw_destroy_addr_space(thread->addr_space);
643 }
644 
646  void *arg, int max_stack)
647 {
648  u64 val;
649  unw_word_t ips[max_stack];
650  unw_addr_space_t addr_space;
651  unw_cursor_t c;
652  int ret, i = 0;
653 
654  ret = perf_reg_value(&val, &ui->sample->user_regs,
656  if (ret)
657  return ret;
658 
659  ips[i++] = (unw_word_t) val;
660 
661  /*
662  * If we need more than one entry, do the DWARF
663  * unwind itself.
664  */
665  if (max_stack - 1 > 0) {
666  WARN_ONCE(!ui->thread, "WARNING: ui->thread is NULL");
667  addr_space = ui->thread->addr_space;
668 
669  if (addr_space == NULL)
670  return -1;
671 
672  ret = unw_init_remote(&c, addr_space, ui);
673  if (ret)
674  display_error(ret);
675 
676  while (!ret && (unw_step(&c) > 0) && i < max_stack) {
677  unw_get_reg(&c, UNW_REG_IP, &ips[i]);
678 
679  /*
680  * Decrement the IP for any non-activation frames.
681  * this is required to properly find the srcline
682  * for caller frames.
683  * See also the documentation for dwfl_frame_pc(),
684  * which this code tries to replicate.
685  */
686  if (unw_is_signal_frame(&c) <= 0)
687  --ips[i];
688 
689  ++i;
690  }
691 
692  max_stack = i;
693  }
694 
695  /*
696  * Display what we got based on the order setup.
697  */
698  for (i = 0; i < max_stack && !ret; i++) {
699  int j = i;
700 
702  j = max_stack - i - 1;
703  ret = ips[j] ? entry(ips[j], ui->thread, cb, arg) : 0;
704  }
705 
706  return ret;
707 }
708 
710  struct thread *thread,
711  struct perf_sample *data, int max_stack)
712 {
713  struct unwind_info ui = {
714  .sample = data,
715  .thread = thread,
716  .machine = thread->mg->machine,
717  };
718 
719  if (!data->user_regs.regs)
720  return -EINVAL;
721 
722  if (max_stack <= 0)
723  return -EINVAL;
724 
725  return get_entries(&ui, cb, arg, max_stack);
726 }
727 
728 static struct unwind_libunwind_ops
731  .flush_access = _unwind__flush_access,
732  .finish_access = _unwind__finish_access,
733  .get_entries = _unwind__get_entries,
734 };
735 
736 #ifndef REMOTE_UNWIND_LIBUNWIND
737 struct unwind_libunwind_ops *
739 #endif
static int find_proc_info(unw_addr_space_t as, unw_word_t ip, unw_proc_info_t *pi, int need_unwind_info, void *arg)
static int access_reg(unw_addr_space_t __maybe_unused as, unw_regnum_t regnum, unw_word_t *valp, int __write, void *arg)
struct map_groups * mg
Definition: thread.h:23
unsigned char table_enc
u64(* map_ip)(struct map *, u64)
Definition: map.h:41
static int get_proc_name(unw_addr_space_t __maybe_unused as, unw_word_t __maybe_unused addr, char __maybe_unused *bufp, size_t __maybe_unused buf_len, unw_word_t __maybe_unused *offp, void __maybe_unused *arg)
#define DW_EH_PE_APPL_MASK
static int _unwind__prepare_access(struct thread *thread)
static int access_fpreg(unw_addr_space_t __maybe_unused as, unw_regnum_t __maybe_unused num, unw_fpreg_t __maybe_unused *val, int __maybe_unused __write, void __maybe_unused *arg)
u64 pgoff
Definition: map.h:34
static int read_unwind_spec_eh_frame(struct dso *dso, struct machine *machine, u64 *table_data, u64 *segbase, u64 *fde_count)
size_t size
Definition: evsel.c:60
u32 start_ip_offset
struct dso::@70 data
u64 eh_frame_hdr_offset
Definition: dso.h:188
void * arg
Definition: unwind-libdw.h:20
static int resume(unw_addr_space_t __maybe_unused as, unw_cursor_t __maybe_unused *cu, void __maybe_unused *arg)
#define DW_EH_PE_absptr
dictionary data
Definition: stat-cpi.py:4
static void _unwind__finish_access(struct thread *thread)
struct map * thread__find_map(struct thread *thread, u8 cpumode, u64 addr, struct addr_location *al)
Definition: event.c:1511
int int err
Definition: 5sec.c:44
static struct unwind_libunwind_ops _unwind_libunwind_ops
unsigned char version
struct unwind_libunwind_ops * local_unwind_libunwind_ops
static int perf_reg_value(u64 *valp __maybe_unused, struct regs_dump *regs __maybe_unused, int id __maybe_unused)
Definition: perf_regs.h:40
int dso__data_get_fd(struct dso *dso, struct machine *machine)
Definition: dso.c:678
#define LIBUNWIND__ARCH_REG_ID(regnum)
Definition: arm64.c:20
unwind_entry_cb_t cb
Definition: unwind-libdw.h:19
u64 ip
Definition: unwind.h:16
int(* unwind_entry_cb_t)(struct unwind_entry *entry, void *arg)
Definition: unwind.h:19
static int read_unwind_spec_debug_frame(struct dso *dso, struct machine *machine, u64 *offset)
#define pr_err(fmt,...)
Definition: json.h:21
x86 movsq based memset() in arch/x86/lib/memset_64.S") MEMSET_FN(memset_erms
#define PERF_ELF_C_READ_MMAP
Definition: symbol.h:34
u16 offset
Definition: event.h:113
#define dw_read_encoded_value(ptr, end, enc)
u64 start
Definition: map.h:28
static struct map * find_map(unw_word_t ip, struct unwind_info *ui)
void * malloc(YYSIZE_T)
char * symsrc_filename
Definition: dso.h:152
ssize_t dso__data_read_addr(struct dso *dso, struct map *map, struct machine *machine, u64 addr, u8 *data, ssize_t size)
Definition: dso.c:1005
struct map * map
Definition: symbol.h:210
Definition: thread.h:18
const char * name
bool dwarf_callchain_users
Definition: callchain.c:47
char name[0]
Definition: dso.h:197
static int get_dyn_info_list_addr(unw_addr_space_t __maybe_unused as, unw_word_t __maybe_unused *dil_addr, void __maybe_unused *arg)
#define pr_debug(fmt,...)
Definition: json.h:27
#define DW_EH_PE_sdata4
u64 debug_frame_offset
Definition: dso.h:187
static int access_mem(unw_addr_space_t __maybe_unused as, unw_word_t addr, unw_word_t *valp, int __write, void *arg)
static int _unwind__get_entries(unwind_entry_cb_t cb, void *arg, struct thread *thread, struct perf_sample *data, int max_stack)
Definition: unwind.h:13
static int get_entries(struct unwind_info *ui, unwind_entry_cb_t cb, void *arg, int max_stack)
static void put_unwind_info(unw_addr_space_t __maybe_unused as, unw_proc_info_t *pi __maybe_unused, void *arg __maybe_unused)
char * data
Definition: event.h:115
int dso__read_binary_type_filename(const struct dso *dso, enum dso_binary_type type, char *root_dir, char *filename, size_t size)
Definition: dso.c:57
struct dso * dso
Definition: map.h:45
struct regs_dump user_regs
Definition: event.h:213
#define dw_read(ptr, type, end)
u32 fde_offset
#define LIBUNWIND__ARCH_REG_IP
Definition: arm64.c:21
Elf_Scn * elf_section_by_name(Elf *elf, GElf_Ehdr *ep, GElf_Shdr *shp, const char *name, size_t *idx)
Definition: symbol-elf.c:171
#define PATH_MAX
Definition: jevents.c:1042
struct symbol * sym
Definition: unwind.h:15
static int access_dso_mem(struct unwind_info *ui, unw_word_t addr, unw_word_t *data)
char name[0]
Definition: symbol.h:66
struct map * map
Definition: unwind.h:14
struct symbol * sym
Definition: symbol.h:211
Definition: dso.h:138
struct eh_frame_hdr __packed
#define DW_EH_PE_omit
#define DW_EH_PE_pcrel
struct machine * machine
Definition: unwind-libdw.h:17
static void display_error(int err)
u64 start
Definition: hists_common.c:25
#define DW_EH_PE_FORMAT_MASK
static int unwind_spec_ehframe(struct dso *dso, struct machine *machine, u64 offset, u64 *table_data, u64 *segbase, u64 *fde_count)
#define DW_EH_PE_udata8
Definition: jevents.c:228
#define DW_EH_PE_udata4
enum chain_order order
Definition: callchain.h:103
#define dwarf_search_unwind_table
struct symbol * thread__find_symbol(struct thread *thread, u8 cpumode, u64 addr, struct addr_location *al)
Definition: event.c:1588
char * root_dir
Definition: machine.h:45
struct thread * thread
Definition: unwind-libdw.h:18
#define DW_EH_PE_ptr
void free(void *)
unsigned char eh_frame_ptr_enc
unsigned char fde_count_enc
ssize_t dso__data_read_offset(struct dso *dso, struct machine *machine, u64 offset, u8 *data, ssize_t size)
Definition: dso.c:986
static int elf_is_exec(int fd, const char *name)
#define DW_EH_PE_sdata8
u64 * regs
Definition: event.h:105
#define pr_warning(fmt,...)
Definition: debug.h:25
static u64 elf_section_offset(int fd, const char *name)
struct perf_sample * sample
Definition: unwind-libdw.h:16
static unw_accessors_t accessors
#define LIBUNWIND__ARCH_REG_SP
Definition: arm64.c:22
struct machine * machine
Definition: map.h:65
static int entry(u64 ip, struct thread *thread, unwind_entry_cb_t cb, void *arg)
static void _unwind__flush_access(struct thread *thread)
void dso__data_put_fd(struct dso *dso __maybe_unused)
Definition: dso.c:694
u64 size
Definition: event.h:114
#define dwarf_find_debug_frame
u64 end
Definition: map.h:29
struct stack_dump user_stack
Definition: event.h:215
static int __dw_read_encoded_value(u8 **p, u8 *end, u64 *val, u8 encoding)
int(* prepare_access)(struct thread *thread)
Definition: unwind.h:22