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

Version: ~ [ linux-5.6.3 ] ~ [ linux-5.5.16 ] ~ [ linux-5.4.31 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.114 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.175 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.218 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.218 ] ~ [ 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-3.16.82 ] ~ [ 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 #include <ctype.h>
  2 #include <dirent.h>
  3 #include <errno.h>
  4 #include <libgen.h>
  5 #include <stdlib.h>
  6 #include <stdio.h>
  7 #include <string.h>
  8 #include <sys/types.h>
  9 #include <sys/stat.h>
 10 #include <sys/param.h>
 11 #include <fcntl.h>
 12 #include <unistd.h>
 13 #include <inttypes.h>
 14 #include "build-id.h"
 15 #include "debug.h"
 16 #include "symbol.h"
 17 #include "strlist.h"
 18 
 19 #include <libelf.h>
 20 #include <gelf.h>
 21 #include <elf.h>
 22 #include <limits.h>
 23 #include <sys/utsname.h>
 24 
 25 #ifndef KSYM_NAME_LEN
 26 #define KSYM_NAME_LEN 256
 27 #endif
 28 
 29 #ifndef NT_GNU_BUILD_ID
 30 #define NT_GNU_BUILD_ID 3
 31 #endif
 32 
 33 static bool dso__build_id_equal(const struct dso *dso, u8 *build_id);
 34 static int elf_read_build_id(Elf *elf, void *bf, size_t size);
 35 static void dsos__add(struct list_head *head, struct dso *dso);
 36 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type);
 37 static int dso__load_kernel_sym(struct dso *dso, struct map *map,
 38                                 symbol_filter_t filter);
 39 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
 40                         symbol_filter_t filter);
 41 static int vmlinux_path__nr_entries;
 42 static char **vmlinux_path;
 43 
 44 struct symbol_conf symbol_conf = {
 45         .exclude_other    = true,
 46         .use_modules      = true,
 47         .try_vmlinux_path = true,
 48         .annotate_src     = true,
 49         .symfs            = "",
 50 };
 51 
 52 int dso__name_len(const struct dso *dso)
 53 {
 54         if (verbose)
 55                 return dso->long_name_len;
 56 
 57         return dso->short_name_len;
 58 }
 59 
 60 bool dso__loaded(const struct dso *dso, enum map_type type)
 61 {
 62         return dso->loaded & (1 << type);
 63 }
 64 
 65 bool dso__sorted_by_name(const struct dso *dso, enum map_type type)
 66 {
 67         return dso->sorted_by_name & (1 << type);
 68 }
 69 
 70 static void dso__set_sorted_by_name(struct dso *dso, enum map_type type)
 71 {
 72         dso->sorted_by_name |= (1 << type);
 73 }
 74 
 75 bool symbol_type__is_a(char symbol_type, enum map_type map_type)
 76 {
 77         symbol_type = toupper(symbol_type);
 78 
 79         switch (map_type) {
 80         case MAP__FUNCTION:
 81                 return symbol_type == 'T' || symbol_type == 'W';
 82         case MAP__VARIABLE:
 83                 return symbol_type == 'D';
 84         default:
 85                 return false;
 86         }
 87 }
 88 
 89 static int prefix_underscores_count(const char *str)
 90 {
 91         const char *tail = str;
 92 
 93         while (*tail == '_')
 94                 tail++;
 95 
 96         return tail - str;
 97 }
 98 
 99 #define SYMBOL_A 0
100 #define SYMBOL_B 1
101 
102 static int choose_best_symbol(struct symbol *syma, struct symbol *symb)
103 {
104         s64 a;
105         s64 b;
106 
107         /* Prefer a symbol with non zero length */
108         a = syma->end - syma->start;
109         b = symb->end - symb->start;
110         if ((b == 0) && (a > 0))
111                 return SYMBOL_A;
112         else if ((a == 0) && (b > 0))
113                 return SYMBOL_B;
114 
115         /* Prefer a non weak symbol over a weak one */
116         a = syma->binding == STB_WEAK;
117         b = symb->binding == STB_WEAK;
118         if (b && !a)
119                 return SYMBOL_A;
120         if (a && !b)
121                 return SYMBOL_B;
122 
123         /* Prefer a global symbol over a non global one */
124         a = syma->binding == STB_GLOBAL;
125         b = symb->binding == STB_GLOBAL;
126         if (a && !b)
127                 return SYMBOL_A;
128         if (b && !a)
129                 return SYMBOL_B;
130 
131         /* Prefer a symbol with less underscores */
132         a = prefix_underscores_count(syma->name);
133         b = prefix_underscores_count(symb->name);
134         if (b > a)
135                 return SYMBOL_A;
136         else if (a > b)
137                 return SYMBOL_B;
138 
139         /* If all else fails, choose the symbol with the longest name */
140         if (strlen(syma->name) >= strlen(symb->name))
141                 return SYMBOL_A;
142         else
143                 return SYMBOL_B;
144 }
145 
146 static void symbols__fixup_duplicate(struct rb_root *symbols)
147 {
148         struct rb_node *nd;
149         struct symbol *curr, *next;
150 
151         nd = rb_first(symbols);
152 
153         while (nd) {
154                 curr = rb_entry(nd, struct symbol, rb_node);
155 again:
156                 nd = rb_next(&curr->rb_node);
157                 next = rb_entry(nd, struct symbol, rb_node);
158 
159                 if (!nd)
160                         break;
161 
162                 if (curr->start != next->start)
163                         continue;
164 
165                 if (choose_best_symbol(curr, next) == SYMBOL_A) {
166                         rb_erase(&next->rb_node, symbols);
167                         goto again;
168                 } else {
169                         nd = rb_next(&curr->rb_node);
170                         rb_erase(&curr->rb_node, symbols);
171                 }
172         }
173 }
174 
175 static void symbols__fixup_end(struct rb_root *symbols)
176 {
177         struct rb_node *nd, *prevnd = rb_first(symbols);
178         struct symbol *curr, *prev;
179 
180         if (prevnd == NULL)
181                 return;
182 
183         curr = rb_entry(prevnd, struct symbol, rb_node);
184 
185         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
186                 prev = curr;
187                 curr = rb_entry(nd, struct symbol, rb_node);
188 
189                 if (prev->end == prev->start && prev->end != curr->start)
190                         prev->end = curr->start - 1;
191         }
192 
193         /* Last entry */
194         if (curr->end == curr->start)
195                 curr->end = roundup(curr->start, 4096);
196 }
197 
198 static void __map_groups__fixup_end(struct map_groups *mg, enum map_type type)
199 {
200         struct map *prev, *curr;
201         struct rb_node *nd, *prevnd = rb_first(&mg->maps[type]);
202 
203         if (prevnd == NULL)
204                 return;
205 
206         curr = rb_entry(prevnd, struct map, rb_node);
207 
208         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
209                 prev = curr;
210                 curr = rb_entry(nd, struct map, rb_node);
211                 prev->end = curr->start - 1;
212         }
213 
214         /*
215          * We still haven't the actual symbols, so guess the
216          * last map final address.
217          */
218         curr->end = ~0ULL;
219 }
220 
221 static void map_groups__fixup_end(struct map_groups *mg)
222 {
223         int i;
224         for (i = 0; i < MAP__NR_TYPES; ++i)
225                 __map_groups__fixup_end(mg, i);
226 }
227 
228 static struct symbol *symbol__new(u64 start, u64 len, u8 binding,
229                                   const char *name)
230 {
231         size_t namelen = strlen(name) + 1;
232         struct symbol *sym = calloc(1, (symbol_conf.priv_size +
233                                         sizeof(*sym) + namelen));
234         if (sym == NULL)
235                 return NULL;
236 
237         if (symbol_conf.priv_size)
238                 sym = ((void *)sym) + symbol_conf.priv_size;
239 
240         sym->start   = start;
241         sym->end     = len ? start + len - 1 : start;
242         sym->binding = binding;
243         sym->namelen = namelen - 1;
244 
245         pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n",
246                   __func__, name, start, sym->end);
247         memcpy(sym->name, name, namelen);
248 
249         return sym;
250 }
251 
252 void symbol__delete(struct symbol *sym)
253 {
254         free(((void *)sym) - symbol_conf.priv_size);
255 }
256 
257 static size_t symbol__fprintf(struct symbol *sym, FILE *fp)
258 {
259         return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %c %s\n",
260                        sym->start, sym->end,
261                        sym->binding == STB_GLOBAL ? 'g' :
262                        sym->binding == STB_LOCAL  ? 'l' : 'w',
263                        sym->name);
264 }
265 
266 void dso__set_long_name(struct dso *dso, char *name)
267 {
268         if (name == NULL)
269                 return;
270         dso->long_name = name;
271         dso->long_name_len = strlen(name);
272 }
273 
274 static void dso__set_short_name(struct dso *dso, const char *name)
275 {
276         if (name == NULL)
277                 return;
278         dso->short_name = name;
279         dso->short_name_len = strlen(name);
280 }
281 
282 static void dso__set_basename(struct dso *dso)
283 {
284         dso__set_short_name(dso, basename(dso->long_name));
285 }
286 
287 struct dso *dso__new(const char *name)
288 {
289         struct dso *dso = calloc(1, sizeof(*dso) + strlen(name) + 1);
290 
291         if (dso != NULL) {
292                 int i;
293                 strcpy(dso->name, name);
294                 dso__set_long_name(dso, dso->name);
295                 dso__set_short_name(dso, dso->name);
296                 for (i = 0; i < MAP__NR_TYPES; ++i)
297                         dso->symbols[i] = dso->symbol_names[i] = RB_ROOT;
298                 dso->symtab_type = SYMTAB__NOT_FOUND;
299                 dso->loaded = 0;
300                 dso->sorted_by_name = 0;
301                 dso->has_build_id = 0;
302                 dso->kernel = DSO_TYPE_USER;
303                 INIT_LIST_HEAD(&dso->node);
304         }
305 
306         return dso;
307 }
308 
309 static void symbols__delete(struct rb_root *symbols)
310 {
311         struct symbol *pos;
312         struct rb_node *next = rb_first(symbols);
313 
314         while (next) {
315                 pos = rb_entry(next, struct symbol, rb_node);
316                 next = rb_next(&pos->rb_node);
317                 rb_erase(&pos->rb_node, symbols);
318                 symbol__delete(pos);
319         }
320 }
321 
322 void dso__delete(struct dso *dso)
323 {
324         int i;
325         for (i = 0; i < MAP__NR_TYPES; ++i)
326                 symbols__delete(&dso->symbols[i]);
327         if (dso->sname_alloc)
328                 free((char *)dso->short_name);
329         if (dso->lname_alloc)
330                 free(dso->long_name);
331         free(dso);
332 }
333 
334 void dso__set_build_id(struct dso *dso, void *build_id)
335 {
336         memcpy(dso->build_id, build_id, sizeof(dso->build_id));
337         dso->has_build_id = 1;
338 }
339 
340 static void symbols__insert(struct rb_root *symbols, struct symbol *sym)
341 {
342         struct rb_node **p = &symbols->rb_node;
343         struct rb_node *parent = NULL;
344         const u64 ip = sym->start;
345         struct symbol *s;
346 
347         while (*p != NULL) {
348                 parent = *p;
349                 s = rb_entry(parent, struct symbol, rb_node);
350                 if (ip < s->start)
351                         p = &(*p)->rb_left;
352                 else
353                         p = &(*p)->rb_right;
354         }
355         rb_link_node(&sym->rb_node, parent, p);
356         rb_insert_color(&sym->rb_node, symbols);
357 }
358 
359 static struct symbol *symbols__find(struct rb_root *symbols, u64 ip)
360 {
361         struct rb_node *n;
362 
363         if (symbols == NULL)
364                 return NULL;
365 
366         n = symbols->rb_node;
367 
368         while (n) {
369                 struct symbol *s = rb_entry(n, struct symbol, rb_node);
370 
371                 if (ip < s->start)
372                         n = n->rb_left;
373                 else if (ip > s->end)
374                         n = n->rb_right;
375                 else
376                         return s;
377         }
378 
379         return NULL;
380 }
381 
382 struct symbol_name_rb_node {
383         struct rb_node  rb_node;
384         struct symbol   sym;
385 };
386 
387 static void symbols__insert_by_name(struct rb_root *symbols, struct symbol *sym)
388 {
389         struct rb_node **p = &symbols->rb_node;
390         struct rb_node *parent = NULL;
391         struct symbol_name_rb_node *symn, *s;
392 
393         symn = container_of(sym, struct symbol_name_rb_node, sym);
394 
395         while (*p != NULL) {
396                 parent = *p;
397                 s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
398                 if (strcmp(sym->name, s->sym.name) < 0)
399                         p = &(*p)->rb_left;
400                 else
401                         p = &(*p)->rb_right;
402         }
403         rb_link_node(&symn->rb_node, parent, p);
404         rb_insert_color(&symn->rb_node, symbols);
405 }
406 
407 static void symbols__sort_by_name(struct rb_root *symbols,
408                                   struct rb_root *source)
409 {
410         struct rb_node *nd;
411 
412         for (nd = rb_first(source); nd; nd = rb_next(nd)) {
413                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
414                 symbols__insert_by_name(symbols, pos);
415         }
416 }
417 
418 static struct symbol *symbols__find_by_name(struct rb_root *symbols,
419                                             const char *name)
420 {
421         struct rb_node *n;
422 
423         if (symbols == NULL)
424                 return NULL;
425 
426         n = symbols->rb_node;
427 
428         while (n) {
429                 struct symbol_name_rb_node *s;
430                 int cmp;
431 
432                 s = rb_entry(n, struct symbol_name_rb_node, rb_node);
433                 cmp = strcmp(name, s->sym.name);
434 
435                 if (cmp < 0)
436                         n = n->rb_left;
437                 else if (cmp > 0)
438                         n = n->rb_right;
439                 else
440                         return &s->sym;
441         }
442 
443         return NULL;
444 }
445 
446 struct symbol *dso__find_symbol(struct dso *dso,
447                                 enum map_type type, u64 addr)
448 {
449         return symbols__find(&dso->symbols[type], addr);
450 }
451 
452 struct symbol *dso__find_symbol_by_name(struct dso *dso, enum map_type type,
453                                         const char *name)
454 {
455         return symbols__find_by_name(&dso->symbol_names[type], name);
456 }
457 
458 void dso__sort_by_name(struct dso *dso, enum map_type type)
459 {
460         dso__set_sorted_by_name(dso, type);
461         return symbols__sort_by_name(&dso->symbol_names[type],
462                                      &dso->symbols[type]);
463 }
464 
465 int build_id__sprintf(const u8 *build_id, int len, char *bf)
466 {
467         char *bid = bf;
468         const u8 *raw = build_id;
469         int i;
470 
471         for (i = 0; i < len; ++i) {
472                 sprintf(bid, "%02x", *raw);
473                 ++raw;
474                 bid += 2;
475         }
476 
477         return raw - build_id;
478 }
479 
480 size_t dso__fprintf_buildid(struct dso *dso, FILE *fp)
481 {
482         char sbuild_id[BUILD_ID_SIZE * 2 + 1];
483 
484         build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
485         return fprintf(fp, "%s", sbuild_id);
486 }
487 
488 size_t dso__fprintf_symbols_by_name(struct dso *dso,
489                                     enum map_type type, FILE *fp)
490 {
491         size_t ret = 0;
492         struct rb_node *nd;
493         struct symbol_name_rb_node *pos;
494 
495         for (nd = rb_first(&dso->symbol_names[type]); nd; nd = rb_next(nd)) {
496                 pos = rb_entry(nd, struct symbol_name_rb_node, rb_node);
497                 fprintf(fp, "%s\n", pos->sym.name);
498         }
499 
500         return ret;
501 }
502 
503 size_t dso__fprintf(struct dso *dso, enum map_type type, FILE *fp)
504 {
505         struct rb_node *nd;
506         size_t ret = fprintf(fp, "dso: %s (", dso->short_name);
507 
508         if (dso->short_name != dso->long_name)
509                 ret += fprintf(fp, "%s, ", dso->long_name);
510         ret += fprintf(fp, "%s, %sloaded, ", map_type__name[type],
511                        dso->loaded ? "" : "NOT ");
512         ret += dso__fprintf_buildid(dso, fp);
513         ret += fprintf(fp, ")\n");
514         for (nd = rb_first(&dso->symbols[type]); nd; nd = rb_next(nd)) {
515                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
516                 ret += symbol__fprintf(pos, fp);
517         }
518 
519         return ret;
520 }
521 
522 int kallsyms__parse(const char *filename, void *arg,
523                     int (*process_symbol)(void *arg, const char *name,
524                                           char type, u64 start, u64 end))
525 {
526         char *line = NULL;
527         size_t n;
528         int err = -1;
529         FILE *file = fopen(filename, "r");
530 
531         if (file == NULL)
532                 goto out_failure;
533 
534         err = 0;
535 
536         while (!feof(file)) {
537                 u64 start;
538                 int line_len, len;
539                 char symbol_type;
540                 char *symbol_name;
541 
542                 line_len = getline(&line, &n, file);
543                 if (line_len < 0 || !line)
544                         break;
545 
546                 line[--line_len] = '\0'; /* \n */
547 
548                 len = hex2u64(line, &start);
549 
550                 len++;
551                 if (len + 2 >= line_len)
552                         continue;
553 
554                 symbol_type = line[len];
555                 len += 2;
556                 symbol_name = line + len;
557                 len = line_len - len;
558 
559                 if (len >= KSYM_NAME_LEN) {
560                         err = -1;
561                         break;
562                 }
563 
564                 /*
565                  * module symbols are not sorted so we add all
566                  * symbols with zero length and rely on
567                  * symbols__fixup_end() to fix it up.
568                  */
569                 err = process_symbol(arg, symbol_name,
570                                      symbol_type, start, start);
571                 if (err)
572                         break;
573         }
574 
575         free(line);
576         fclose(file);
577         return err;
578 
579 out_failure:
580         return -1;
581 }
582 
583 struct process_kallsyms_args {
584         struct map *map;
585         struct dso *dso;
586 };
587 
588 static u8 kallsyms2elf_type(char type)
589 {
590         if (type == 'W')
591                 return STB_WEAK;
592 
593         return isupper(type) ? STB_GLOBAL : STB_LOCAL;
594 }
595 
596 static int map__process_kallsym_symbol(void *arg, const char *name,
597                                        char type, u64 start, u64 end)
598 {
599         struct symbol *sym;
600         struct process_kallsyms_args *a = arg;
601         struct rb_root *root = &a->dso->symbols[a->map->type];
602 
603         if (!symbol_type__is_a(type, a->map->type))
604                 return 0;
605 
606         sym = symbol__new(start, end - start + 1,
607                           kallsyms2elf_type(type), name);
608         if (sym == NULL)
609                 return -ENOMEM;
610         /*
611          * We will pass the symbols to the filter later, in
612          * map__split_kallsyms, when we have split the maps per module
613          */
614         symbols__insert(root, sym);
615 
616         return 0;
617 }
618 
619 /*
620  * Loads the function entries in /proc/kallsyms into kernel_map->dso,
621  * so that we can in the next step set the symbol ->end address and then
622  * call kernel_maps__split_kallsyms.
623  */
624 static int dso__load_all_kallsyms(struct dso *dso, const char *filename,
625                                   struct map *map)
626 {
627         struct process_kallsyms_args args = { .map = map, .dso = dso, };
628         return kallsyms__parse(filename, &args, map__process_kallsym_symbol);
629 }
630 
631 /*
632  * Split the symbols into maps, making sure there are no overlaps, i.e. the
633  * kernel range is broken in several maps, named [kernel].N, as we don't have
634  * the original ELF section names vmlinux have.
635  */
636 static int dso__split_kallsyms(struct dso *dso, struct map *map,
637                                symbol_filter_t filter)
638 {
639         struct map_groups *kmaps = map__kmap(map)->kmaps;
640         struct machine *machine = kmaps->machine;
641         struct map *curr_map = map;
642         struct symbol *pos;
643         int count = 0, moved = 0;       
644         struct rb_root *root = &dso->symbols[map->type];
645         struct rb_node *next = rb_first(root);
646         int kernel_range = 0;
647 
648         while (next) {
649                 char *module;
650 
651                 pos = rb_entry(next, struct symbol, rb_node);
652                 next = rb_next(&pos->rb_node);
653 
654                 module = strchr(pos->name, '\t');
655                 if (module) {
656                         if (!symbol_conf.use_modules)
657                                 goto discard_symbol;
658 
659                         *module++ = '\0';
660 
661                         if (strcmp(curr_map->dso->short_name, module)) {
662                                 if (curr_map != map &&
663                                     dso->kernel == DSO_TYPE_GUEST_KERNEL &&
664                                     machine__is_default_guest(machine)) {
665                                         /*
666                                          * We assume all symbols of a module are
667                                          * continuous in * kallsyms, so curr_map
668                                          * points to a module and all its
669                                          * symbols are in its kmap. Mark it as
670                                          * loaded.
671                                          */
672                                         dso__set_loaded(curr_map->dso,
673                                                         curr_map->type);
674                                 }
675 
676                                 curr_map = map_groups__find_by_name(kmaps,
677                                                         map->type, module);
678                                 if (curr_map == NULL) {
679                                         pr_debug("%s/proc/{kallsyms,modules} "
680                                                  "inconsistency while looking "
681                                                  "for \"%s\" module!\n",
682                                                  machine->root_dir, module);
683                                         curr_map = map;
684                                         goto discard_symbol;
685                                 }
686 
687                                 if (curr_map->dso->loaded &&
688                                     !machine__is_default_guest(machine))
689                                         goto discard_symbol;
690                         }
691                         /*
692                          * So that we look just like we get from .ko files,
693                          * i.e. not prelinked, relative to map->start.
694                          */
695                         pos->start = curr_map->map_ip(curr_map, pos->start);
696                         pos->end   = curr_map->map_ip(curr_map, pos->end);
697                 } else if (curr_map != map) {
698                         char dso_name[PATH_MAX];
699                         struct dso *ndso;
700 
701                         if (count == 0) {
702                                 curr_map = map;
703                                 goto filter_symbol;
704                         }
705 
706                         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
707                                 snprintf(dso_name, sizeof(dso_name),
708                                         "[guest.kernel].%d",
709                                         kernel_range++);
710                         else
711                                 snprintf(dso_name, sizeof(dso_name),
712                                         "[kernel].%d",
713                                         kernel_range++);
714 
715                         ndso = dso__new(dso_name);
716                         if (ndso == NULL)
717                                 return -1;
718 
719                         ndso->kernel = dso->kernel;
720 
721                         curr_map = map__new2(pos->start, ndso, map->type);
722                         if (curr_map == NULL) {
723                                 dso__delete(ndso);
724                                 return -1;
725                         }
726 
727                         curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
728                         map_groups__insert(kmaps, curr_map);
729                         ++kernel_range;
730                 }
731 filter_symbol:
732                 if (filter && filter(curr_map, pos)) {
733 discard_symbol:         rb_erase(&pos->rb_node, root);
734                         symbol__delete(pos);
735                 } else {
736                         if (curr_map != map) {
737                                 rb_erase(&pos->rb_node, root);
738                                 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
739                                 ++moved;
740                         } else
741                                 ++count;
742                 }
743         }
744 
745         if (curr_map != map &&
746             dso->kernel == DSO_TYPE_GUEST_KERNEL &&
747             machine__is_default_guest(kmaps->machine)) {
748                 dso__set_loaded(curr_map->dso, curr_map->type);
749         }
750 
751         return count + moved;
752 }
753 
754 static bool symbol__restricted_filename(const char *filename,
755                                         const char *restricted_filename)
756 {
757         bool restricted = false;
758 
759         if (symbol_conf.kptr_restrict) {
760                 char *r = realpath(filename, NULL);
761 
762                 if (r != NULL) {
763                         restricted = strcmp(r, restricted_filename) == 0;
764                         free(r);
765                         return restricted;
766                 }
767         }
768 
769         return restricted;
770 }
771 
772 int dso__load_kallsyms(struct dso *dso, const char *filename,
773                        struct map *map, symbol_filter_t filter)
774 {
775         if (symbol__restricted_filename(filename, "/proc/kallsyms"))
776                 return -1;
777 
778         if (dso__load_all_kallsyms(dso, filename, map) < 0)
779                 return -1;
780 
781         symbols__fixup_duplicate(&dso->symbols[map->type]);
782         symbols__fixup_end(&dso->symbols[map->type]);
783 
784         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
785                 dso->symtab_type = SYMTAB__GUEST_KALLSYMS;
786         else
787                 dso->symtab_type = SYMTAB__KALLSYMS;
788 
789         return dso__split_kallsyms(dso, map, filter);
790 }
791 
792 static int dso__load_perf_map(struct dso *dso, struct map *map,
793                               symbol_filter_t filter)
794 {
795         char *line = NULL;
796         size_t n;
797         FILE *file;
798         int nr_syms = 0;
799 
800         file = fopen(dso->long_name, "r");
801         if (file == NULL)
802                 goto out_failure;
803 
804         while (!feof(file)) {
805                 u64 start, size;
806                 struct symbol *sym;
807                 int line_len, len;
808 
809                 line_len = getline(&line, &n, file);
810                 if (line_len < 0)
811                         break;
812 
813                 if (!line)
814                         goto out_failure;
815 
816                 line[--line_len] = '\0'; /* \n */
817 
818                 len = hex2u64(line, &start);
819 
820                 len++;
821                 if (len + 2 >= line_len)
822                         continue;
823 
824                 len += hex2u64(line + len, &size);
825 
826                 len++;
827                 if (len + 2 >= line_len)
828                         continue;
829 
830                 sym = symbol__new(start, size, STB_GLOBAL, line + len);
831 
832                 if (sym == NULL)
833                         goto out_delete_line;
834 
835                 if (filter && filter(map, sym))
836                         symbol__delete(sym);
837                 else {
838                         symbols__insert(&dso->symbols[map->type], sym);
839                         nr_syms++;
840                 }
841         }
842 
843         free(line);
844         fclose(file);
845 
846         return nr_syms;
847 
848 out_delete_line:
849         free(line);
850 out_failure:
851         return -1;
852 }
853 
854 /**
855  * elf_symtab__for_each_symbol - iterate thru all the symbols
856  *
857  * @syms: struct elf_symtab instance to iterate
858  * @idx: uint32_t idx
859  * @sym: GElf_Sym iterator
860  */
861 #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
862         for (idx = 0, gelf_getsym(syms, idx, &sym);\
863              idx < nr_syms; \
864              idx++, gelf_getsym(syms, idx, &sym))
865 
866 static inline uint8_t elf_sym__type(const GElf_Sym *sym)
867 {
868         return GELF_ST_TYPE(sym->st_info);
869 }
870 
871 static inline int elf_sym__is_function(const GElf_Sym *sym)
872 {
873         return elf_sym__type(sym) == STT_FUNC &&
874                sym->st_name != 0 &&
875                sym->st_shndx != SHN_UNDEF;
876 }
877 
878 static inline bool elf_sym__is_object(const GElf_Sym *sym)
879 {
880         return elf_sym__type(sym) == STT_OBJECT &&
881                 sym->st_name != 0 &&
882                 sym->st_shndx != SHN_UNDEF;
883 }
884 
885 static inline int elf_sym__is_label(const GElf_Sym *sym)
886 {
887         return elf_sym__type(sym) == STT_NOTYPE &&
888                 sym->st_name != 0 &&
889                 sym->st_shndx != SHN_UNDEF &&
890                 sym->st_shndx != SHN_ABS;
891 }
892 
893 static inline const char *elf_sec__name(const GElf_Shdr *shdr,
894                                         const Elf_Data *secstrs)
895 {
896         return secstrs->d_buf + shdr->sh_name;
897 }
898 
899 static inline int elf_sec__is_text(const GElf_Shdr *shdr,
900                                         const Elf_Data *secstrs)
901 {
902         return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
903 }
904 
905 static inline bool elf_sec__is_data(const GElf_Shdr *shdr,
906                                     const Elf_Data *secstrs)
907 {
908         return strstr(elf_sec__name(shdr, secstrs), "data") != NULL;
909 }
910 
911 static inline const char *elf_sym__name(const GElf_Sym *sym,
912                                         const Elf_Data *symstrs)
913 {
914         return symstrs->d_buf + sym->st_name;
915 }
916 
917 static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
918                                     GElf_Shdr *shp, const char *name,
919                                     size_t *idx)
920 {
921         Elf_Scn *sec = NULL;
922         size_t cnt = 1;
923 
924         while ((sec = elf_nextscn(elf, sec)) != NULL) {
925                 char *str;
926 
927                 gelf_getshdr(sec, shp);
928                 str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
929                 if (!strcmp(name, str)) {
930                         if (idx)
931                                 *idx = cnt;
932                         break;
933                 }
934                 ++cnt;
935         }
936 
937         return sec;
938 }
939 
940 #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
941         for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \
942              idx < nr_entries; \
943              ++idx, pos = gelf_getrel(reldata, idx, &pos_mem))
944 
945 #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \
946         for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \
947              idx < nr_entries; \
948              ++idx, pos = gelf_getrela(reldata, idx, &pos_mem))
949 
950 /*
951  * We need to check if we have a .dynsym, so that we can handle the
952  * .plt, synthesizing its symbols, that aren't on the symtabs (be it
953  * .dynsym or .symtab).
954  * And always look at the original dso, not at debuginfo packages, that
955  * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
956  */
957 static int dso__synthesize_plt_symbols(struct  dso *dso, struct map *map,
958                                        symbol_filter_t filter)
959 {
960         uint32_t nr_rel_entries, idx;
961         GElf_Sym sym;
962         u64 plt_offset;
963         GElf_Shdr shdr_plt;
964         struct symbol *f;
965         GElf_Shdr shdr_rel_plt, shdr_dynsym;
966         Elf_Data *reldata, *syms, *symstrs;
967         Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym;
968         size_t dynsym_idx;
969         GElf_Ehdr ehdr;
970         char sympltname[1024];
971         Elf *elf;
972         int nr = 0, symidx, fd, err = 0;
973         char name[PATH_MAX];
974 
975         snprintf(name, sizeof(name), "%s%s",
976                  symbol_conf.symfs, dso->long_name);
977         fd = open(name, O_RDONLY);
978         if (fd < 0)
979                 goto out;
980 
981         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
982         if (elf == NULL)
983                 goto out_close;
984 
985         if (gelf_getehdr(elf, &ehdr) == NULL)
986                 goto out_elf_end;
987 
988         scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym,
989                                          ".dynsym", &dynsym_idx);
990         if (scn_dynsym == NULL)
991                 goto out_elf_end;
992 
993         scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
994                                           ".rela.plt", NULL);
995         if (scn_plt_rel == NULL) {
996                 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
997                                                   ".rel.plt", NULL);
998                 if (scn_plt_rel == NULL)
999                         goto out_elf_end;
1000         }
1001 
1002         err = -1;
1003 
1004         if (shdr_rel_plt.sh_link != dynsym_idx)
1005                 goto out_elf_end;
1006 
1007         if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL)
1008                 goto out_elf_end;
1009 
1010         /*
1011          * Fetch the relocation section to find the idxes to the GOT
1012          * and the symbols in the .dynsym they refer to.
1013          */
1014         reldata = elf_getdata(scn_plt_rel, NULL);
1015         if (reldata == NULL)
1016                 goto out_elf_end;
1017 
1018         syms = elf_getdata(scn_dynsym, NULL);
1019         if (syms == NULL)
1020                 goto out_elf_end;
1021 
1022         scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link);
1023         if (scn_symstrs == NULL)
1024                 goto out_elf_end;
1025 
1026         symstrs = elf_getdata(scn_symstrs, NULL);
1027         if (symstrs == NULL)
1028                 goto out_elf_end;
1029 
1030         nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize;
1031         plt_offset = shdr_plt.sh_offset;
1032 
1033         if (shdr_rel_plt.sh_type == SHT_RELA) {
1034                 GElf_Rela pos_mem, *pos;
1035 
1036                 elf_section__for_each_rela(reldata, pos, pos_mem, idx,
1037                                            nr_rel_entries) {
1038                         symidx = GELF_R_SYM(pos->r_info);
1039                         plt_offset += shdr_plt.sh_entsize;
1040                         gelf_getsym(syms, symidx, &sym);
1041                         snprintf(sympltname, sizeof(sympltname),
1042                                  "%s@plt", elf_sym__name(&sym, symstrs));
1043 
1044                         f = symbol__new(plt_offset, shdr_plt.sh_entsize,
1045                                         STB_GLOBAL, sympltname);
1046                         if (!f)
1047                                 goto out_elf_end;
1048 
1049                         if (filter && filter(map, f))
1050                                 symbol__delete(f);
1051                         else {
1052                                 symbols__insert(&dso->symbols[map->type], f);
1053                                 ++nr;
1054                         }
1055                 }
1056         } else if (shdr_rel_plt.sh_type == SHT_REL) {
1057                 GElf_Rel pos_mem, *pos;
1058                 elf_section__for_each_rel(reldata, pos, pos_mem, idx,
1059                                           nr_rel_entries) {
1060                         symidx = GELF_R_SYM(pos->r_info);
1061                         plt_offset += shdr_plt.sh_entsize;
1062                         gelf_getsym(syms, symidx, &sym);
1063                         snprintf(sympltname, sizeof(sympltname),
1064                                  "%s@plt", elf_sym__name(&sym, symstrs));
1065 
1066                         f = symbol__new(plt_offset, shdr_plt.sh_entsize,
1067                                         STB_GLOBAL, sympltname);
1068                         if (!f)
1069                                 goto out_elf_end;
1070 
1071                         if (filter && filter(map, f))
1072                                 symbol__delete(f);
1073                         else {
1074                                 symbols__insert(&dso->symbols[map->type], f);
1075                                 ++nr;
1076                         }
1077                 }
1078         }
1079 
1080         err = 0;
1081 out_elf_end:
1082         elf_end(elf);
1083 out_close:
1084         close(fd);
1085 
1086         if (err == 0)
1087                 return nr;
1088 out:
1089         pr_debug("%s: problems reading %s PLT info.\n",
1090                  __func__, dso->long_name);
1091         return 0;
1092 }
1093 
1094 static bool elf_sym__is_a(GElf_Sym *sym, enum map_type type)
1095 {
1096         switch (type) {
1097         case MAP__FUNCTION:
1098                 return elf_sym__is_function(sym);
1099         case MAP__VARIABLE:
1100                 return elf_sym__is_object(sym);
1101         default:
1102                 return false;
1103         }
1104 }
1105 
1106 static bool elf_sec__is_a(GElf_Shdr *shdr, Elf_Data *secstrs,
1107                           enum map_type type)
1108 {
1109         switch (type) {
1110         case MAP__FUNCTION:
1111                 return elf_sec__is_text(shdr, secstrs);
1112         case MAP__VARIABLE:
1113                 return elf_sec__is_data(shdr, secstrs);
1114         default:
1115                 return false;
1116         }
1117 }
1118 
1119 static size_t elf_addr_to_index(Elf *elf, GElf_Addr addr)
1120 {
1121         Elf_Scn *sec = NULL;
1122         GElf_Shdr shdr;
1123         size_t cnt = 1;
1124 
1125         while ((sec = elf_nextscn(elf, sec)) != NULL) {
1126                 gelf_getshdr(sec, &shdr);
1127 
1128                 if ((addr >= shdr.sh_addr) &&
1129                     (addr < (shdr.sh_addr + shdr.sh_size)))
1130                         return cnt;
1131 
1132                 ++cnt;
1133         }
1134 
1135         return -1;
1136 }
1137 
1138 static int dso__load_sym(struct dso *dso, struct map *map, const char *name,
1139                          int fd, symbol_filter_t filter, int kmodule,
1140                          int want_symtab)
1141 {
1142         struct kmap *kmap = dso->kernel ? map__kmap(map) : NULL;
1143         struct map *curr_map = map;
1144         struct dso *curr_dso = dso;
1145         Elf_Data *symstrs, *secstrs;
1146         uint32_t nr_syms;
1147         int err = -1;
1148         uint32_t idx;
1149         GElf_Ehdr ehdr;
1150         GElf_Shdr shdr, opdshdr;
1151         Elf_Data *syms, *opddata = NULL;
1152         GElf_Sym sym;
1153         Elf_Scn *sec, *sec_strndx, *opdsec;
1154         Elf *elf;
1155         int nr = 0;
1156         size_t opdidx = 0;
1157 
1158         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1159         if (elf == NULL) {
1160                 pr_debug("%s: cannot read %s ELF file.\n", __func__, name);
1161                 goto out_close;
1162         }
1163 
1164         if (gelf_getehdr(elf, &ehdr) == NULL) {
1165                 pr_debug("%s: cannot get elf header.\n", __func__);
1166                 goto out_elf_end;
1167         }
1168 
1169         /* Always reject images with a mismatched build-id: */
1170         if (dso->has_build_id) {
1171                 u8 build_id[BUILD_ID_SIZE];
1172 
1173                 if (elf_read_build_id(elf, build_id, BUILD_ID_SIZE) < 0)
1174                         goto out_elf_end;
1175 
1176                 if (!dso__build_id_equal(dso, build_id))
1177                         goto out_elf_end;
1178         }
1179 
1180         sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL);
1181         if (sec == NULL) {
1182                 if (want_symtab)
1183                         goto out_elf_end;
1184 
1185                 sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL);
1186                 if (sec == NULL)
1187                         goto out_elf_end;
1188         }
1189 
1190         opdsec = elf_section_by_name(elf, &ehdr, &opdshdr, ".opd", &opdidx);
1191         if (opdshdr.sh_type != SHT_PROGBITS)
1192                 opdsec = NULL;
1193         if (opdsec)
1194                 opddata = elf_rawdata(opdsec, NULL);
1195 
1196         syms = elf_getdata(sec, NULL);
1197         if (syms == NULL)
1198                 goto out_elf_end;
1199 
1200         sec = elf_getscn(elf, shdr.sh_link);
1201         if (sec == NULL)
1202                 goto out_elf_end;
1203 
1204         symstrs = elf_getdata(sec, NULL);
1205         if (symstrs == NULL)
1206                 goto out_elf_end;
1207 
1208         sec_strndx = elf_getscn(elf, ehdr.e_shstrndx);
1209         if (sec_strndx == NULL)
1210                 goto out_elf_end;
1211 
1212         secstrs = elf_getdata(sec_strndx, NULL);
1213         if (secstrs == NULL)
1214                 goto out_elf_end;
1215 
1216         nr_syms = shdr.sh_size / shdr.sh_entsize;
1217 
1218         memset(&sym, 0, sizeof(sym));
1219         if (dso->kernel == DSO_TYPE_USER) {
1220                 dso->adjust_symbols = (ehdr.e_type == ET_EXEC ||
1221                                 elf_section_by_name(elf, &ehdr, &shdr,
1222                                                      ".gnu.prelink_undo",
1223                                                      NULL) != NULL);
1224         } else {
1225                 dso->adjust_symbols = 0;
1226         }
1227         elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
1228                 struct symbol *f;
1229                 const char *elf_name = elf_sym__name(&sym, symstrs);
1230                 char *demangled = NULL;
1231                 int is_label = elf_sym__is_label(&sym);
1232                 const char *section_name;
1233 
1234                 if (kmap && kmap->ref_reloc_sym && kmap->ref_reloc_sym->name &&
1235                     strcmp(elf_name, kmap->ref_reloc_sym->name) == 0)
1236                         kmap->ref_reloc_sym->unrelocated_addr = sym.st_value;
1237 
1238                 if (!is_label && !elf_sym__is_a(&sym, map->type))
1239                         continue;
1240 
1241                 /* Reject ARM ELF "mapping symbols": these aren't unique and
1242                  * don't identify functions, so will confuse the profile
1243                  * output: */
1244                 if (ehdr.e_machine == EM_ARM) {
1245                         if (!strcmp(elf_name, "$a") ||
1246                             !strcmp(elf_name, "$d") ||
1247                             !strcmp(elf_name, "$t"))
1248                                 continue;
1249                 }
1250 
1251                 if (opdsec && sym.st_shndx == opdidx) {
1252                         u32 offset = sym.st_value - opdshdr.sh_addr;
1253                         u64 *opd = opddata->d_buf + offset;
1254                         sym.st_value = *opd;
1255                         sym.st_shndx = elf_addr_to_index(elf, sym.st_value);
1256                 }
1257 
1258                 sec = elf_getscn(elf, sym.st_shndx);
1259                 if (!sec)
1260                         goto out_elf_end;
1261 
1262                 gelf_getshdr(sec, &shdr);
1263 
1264                 if (is_label && !elf_sec__is_a(&shdr, secstrs, map->type))
1265                         continue;
1266 
1267                 section_name = elf_sec__name(&shdr, secstrs);
1268 
1269                 /* On ARM, symbols for thumb functions have 1 added to
1270                  * the symbol address as a flag - remove it */
1271                 if ((ehdr.e_machine == EM_ARM) &&
1272                     (map->type == MAP__FUNCTION) &&
1273                     (sym.st_value & 1))
1274                         --sym.st_value;
1275 
1276                 if (dso->kernel != DSO_TYPE_USER || kmodule) {
1277                         char dso_name[PATH_MAX];
1278 
1279                         if (strcmp(section_name,
1280                                    (curr_dso->short_name +
1281                                     dso->short_name_len)) == 0)
1282                                 goto new_symbol;
1283 
1284                         if (strcmp(section_name, ".text") == 0) {
1285                                 curr_map = map;
1286                                 curr_dso = dso;
1287                                 goto new_symbol;
1288                         }
1289 
1290                         snprintf(dso_name, sizeof(dso_name),
1291                                  "%s%s", dso->short_name, section_name);
1292 
1293                         curr_map = map_groups__find_by_name(kmap->kmaps, map->type, dso_name);
1294                         if (curr_map == NULL) {
1295                                 u64 start = sym.st_value;
1296 
1297                                 if (kmodule)
1298                                         start += map->start + shdr.sh_offset;
1299 
1300                                 curr_dso = dso__new(dso_name);
1301                                 if (curr_dso == NULL)
1302                                         goto out_elf_end;
1303                                 curr_dso->kernel = dso->kernel;
1304                                 curr_dso->long_name = dso->long_name;
1305                                 curr_dso->long_name_len = dso->long_name_len;
1306                                 curr_map = map__new2(start, curr_dso,
1307                                                      map->type);
1308                                 if (curr_map == NULL) {
1309                                         dso__delete(curr_dso);
1310                                         goto out_elf_end;
1311                                 }
1312                                 curr_map->map_ip = identity__map_ip;
1313                                 curr_map->unmap_ip = identity__map_ip;
1314                                 curr_dso->symtab_type = dso->symtab_type;
1315                                 map_groups__insert(kmap->kmaps, curr_map);
1316                                 dsos__add(&dso->node, curr_dso);
1317                                 dso__set_loaded(curr_dso, map->type);
1318                         } else
1319                                 curr_dso = curr_map->dso;
1320 
1321                         goto new_symbol;
1322                 }
1323 
1324                 if (curr_dso->adjust_symbols) {
1325                         pr_debug4("%s: adjusting symbol: st_value: %#" PRIx64 " "
1326                                   "sh_addr: %#" PRIx64 " sh_offset: %#" PRIx64 "\n", __func__,
1327                                   (u64)sym.st_value, (u64)shdr.sh_addr,
1328                                   (u64)shdr.sh_offset);
1329                         sym.st_value -= shdr.sh_addr - shdr.sh_offset;
1330                 }
1331                 /*
1332                  * We need to figure out if the object was created from C++ sources
1333                  * DWARF DW_compile_unit has this, but we don't always have access
1334                  * to it...
1335                  */
1336                 demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI);
1337                 if (demangled != NULL)
1338                         elf_name = demangled;
1339 new_symbol:
1340                 f = symbol__new(sym.st_value, sym.st_size,
1341                                 GELF_ST_BIND(sym.st_info), elf_name);
1342                 free(demangled);
1343                 if (!f)
1344                         goto out_elf_end;
1345 
1346                 if (filter && filter(curr_map, f))
1347                         symbol__delete(f);
1348                 else {
1349                         symbols__insert(&curr_dso->symbols[curr_map->type], f);
1350                         nr++;
1351                 }
1352         }
1353 
1354         /*
1355          * For misannotated, zeroed, ASM function sizes.
1356          */
1357         if (nr > 0) {
1358                 symbols__fixup_duplicate(&dso->symbols[map->type]);
1359                 symbols__fixup_end(&dso->symbols[map->type]);
1360                 if (kmap) {
1361                         /*
1362                          * We need to fixup this here too because we create new
1363                          * maps here, for things like vsyscall sections.
1364                          */
1365                         __map_groups__fixup_end(kmap->kmaps, map->type);
1366                 }
1367         }
1368         err = nr;
1369 out_elf_end:
1370         elf_end(elf);
1371 out_close:
1372         return err;
1373 }
1374 
1375 static bool dso__build_id_equal(const struct dso *dso, u8 *build_id)
1376 {
1377         return memcmp(dso->build_id, build_id, sizeof(dso->build_id)) == 0;
1378 }
1379 
1380 bool __dsos__read_build_ids(struct list_head *head, bool with_hits)
1381 {
1382         bool have_build_id = false;
1383         struct dso *pos;
1384 
1385         list_for_each_entry(pos, head, node) {
1386                 if (with_hits && !pos->hit)
1387                         continue;
1388                 if (pos->has_build_id) {
1389                         have_build_id = true;
1390                         continue;
1391                 }
1392                 if (filename__read_build_id(pos->long_name, pos->build_id,
1393                                             sizeof(pos->build_id)) > 0) {
1394                         have_build_id     = true;
1395                         pos->has_build_id = true;
1396                 }
1397         }
1398 
1399         return have_build_id;
1400 }
1401 
1402 /*
1403  * Align offset to 4 bytes as needed for note name and descriptor data.
1404  */
1405 #define NOTE_ALIGN(n) (((n) + 3) & -4U)
1406 
1407 static int elf_read_build_id(Elf *elf, void *bf, size_t size)
1408 {
1409         int err = -1;
1410         GElf_Ehdr ehdr;
1411         GElf_Shdr shdr;
1412         Elf_Data *data;
1413         Elf_Scn *sec;
1414         Elf_Kind ek;
1415         void *ptr;
1416 
1417         if (size < BUILD_ID_SIZE)
1418                 goto out;
1419 
1420         ek = elf_kind(elf);
1421         if (ek != ELF_K_ELF)
1422                 goto out;
1423 
1424         if (gelf_getehdr(elf, &ehdr) == NULL) {
1425                 pr_err("%s: cannot get elf header.\n", __func__);
1426                 goto out;
1427         }
1428 
1429         sec = elf_section_by_name(elf, &ehdr, &shdr,
1430                                   ".note.gnu.build-id", NULL);
1431         if (sec == NULL) {
1432                 sec = elf_section_by_name(elf, &ehdr, &shdr,
1433                                           ".notes", NULL);
1434                 if (sec == NULL)
1435                         goto out;
1436         }
1437 
1438         data = elf_getdata(sec, NULL);
1439         if (data == NULL)
1440                 goto out;
1441 
1442         ptr = data->d_buf;
1443         while (ptr < (data->d_buf + data->d_size)) {
1444                 GElf_Nhdr *nhdr = ptr;
1445                 size_t namesz = NOTE_ALIGN(nhdr->n_namesz),
1446                        descsz = NOTE_ALIGN(nhdr->n_descsz);
1447                 const char *name;
1448 
1449                 ptr += sizeof(*nhdr);
1450                 name = ptr;
1451                 ptr += namesz;
1452                 if (nhdr->n_type == NT_GNU_BUILD_ID &&
1453                     nhdr->n_namesz == sizeof("GNU")) {
1454                         if (memcmp(name, "GNU", sizeof("GNU")) == 0) {
1455                                 size_t sz = min(size, descsz);
1456                                 memcpy(bf, ptr, sz);
1457                                 memset(bf + sz, 0, size - sz);
1458                                 err = descsz;
1459                                 break;
1460                         }
1461                 }
1462                 ptr += descsz;
1463         }
1464 
1465 out:
1466         return err;
1467 }
1468 
1469 int filename__read_build_id(const char *filename, void *bf, size_t size)
1470 {
1471         int fd, err = -1;
1472         Elf *elf;
1473 
1474         if (size < BUILD_ID_SIZE)
1475                 goto out;
1476 
1477         fd = open(filename, O_RDONLY);
1478         if (fd < 0)
1479                 goto out;
1480 
1481         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1482         if (elf == NULL) {
1483                 pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename);
1484                 goto out_close;
1485         }
1486 
1487         err = elf_read_build_id(elf, bf, size);
1488 
1489         elf_end(elf);
1490 out_close:
1491         close(fd);
1492 out:
1493         return err;
1494 }
1495 
1496 int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
1497 {
1498         int fd, err = -1;
1499 
1500         if (size < BUILD_ID_SIZE)
1501                 goto out;
1502 
1503         fd = open(filename, O_RDONLY);
1504         if (fd < 0)
1505                 goto out;
1506 
1507         while (1) {
1508                 char bf[BUFSIZ];
1509                 GElf_Nhdr nhdr;
1510                 size_t namesz, descsz;
1511 
1512                 if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr))
1513                         break;
1514 
1515                 namesz = NOTE_ALIGN(nhdr.n_namesz);
1516                 descsz = NOTE_ALIGN(nhdr.n_descsz);
1517                 if (nhdr.n_type == NT_GNU_BUILD_ID &&
1518                     nhdr.n_namesz == sizeof("GNU")) {
1519                         if (read(fd, bf, namesz) != (ssize_t)namesz)
1520                                 break;
1521                         if (memcmp(bf, "GNU", sizeof("GNU")) == 0) {
1522                                 size_t sz = min(descsz, size);
1523                                 if (read(fd, build_id, sz) == (ssize_t)sz) {
1524                                         memset(build_id + sz, 0, size - sz);
1525                                         err = 0;
1526                                         break;
1527                                 }
1528                         } else if (read(fd, bf, descsz) != (ssize_t)descsz)
1529                                 break;
1530                 } else {
1531                         int n = namesz + descsz;
1532                         if (read(fd, bf, n) != n)
1533                                 break;
1534                 }
1535         }
1536         close(fd);
1537 out:
1538         return err;
1539 }
1540 
1541 char dso__symtab_origin(const struct dso *dso)
1542 {
1543         static const char origin[] = {
1544                 [SYMTAB__KALLSYMS]            = 'k',
1545                 [SYMTAB__JAVA_JIT]            = 'j',
1546                 [SYMTAB__BUILD_ID_CACHE]      = 'B',
1547                 [SYMTAB__FEDORA_DEBUGINFO]    = 'f',
1548                 [SYMTAB__UBUNTU_DEBUGINFO]    = 'u',
1549                 [SYMTAB__BUILDID_DEBUGINFO]   = 'b',
1550                 [SYMTAB__SYSTEM_PATH_DSO]     = 'd',
1551                 [SYMTAB__SYSTEM_PATH_KMODULE] = 'K',
1552                 [SYMTAB__GUEST_KALLSYMS]      =  'g',
1553                 [SYMTAB__GUEST_KMODULE]       =  'G',
1554         };
1555 
1556         if (dso == NULL || dso->symtab_type == SYMTAB__NOT_FOUND)
1557                 return '!';
1558         return origin[dso->symtab_type];
1559 }
1560 
1561 int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
1562 {
1563         int size = PATH_MAX;
1564         char *name;
1565         int ret = -1;
1566         int fd;
1567         struct machine *machine;
1568         const char *root_dir;
1569         int want_symtab;
1570 
1571         dso__set_loaded(dso, map->type);
1572 
1573         if (dso->kernel == DSO_TYPE_KERNEL)
1574                 return dso__load_kernel_sym(dso, map, filter);
1575         else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1576                 return dso__load_guest_kernel_sym(dso, map, filter);
1577 
1578         if (map->groups && map->groups->machine)
1579                 machine = map->groups->machine;
1580         else
1581                 machine = NULL;
1582 
1583         name = malloc(size);
1584         if (!name)
1585                 return -1;
1586 
1587         dso->adjust_symbols = 0;
1588 
1589         if (strncmp(dso->name, "/tmp/perf-", 10) == 0) {
1590                 struct stat st;
1591 
1592                 if (lstat(dso->name, &st) < 0)
1593                         return -1;
1594 
1595                 if (st.st_uid && (st.st_uid != geteuid())) {
1596                         pr_warning("File %s not owned by current user or root, "
1597                                 "ignoring it.\n", dso->name);
1598                         return -1;
1599                 }
1600 
1601                 ret = dso__load_perf_map(dso, map, filter);
1602                 dso->symtab_type = ret > 0 ? SYMTAB__JAVA_JIT :
1603                                               SYMTAB__NOT_FOUND;
1604                 return ret;
1605         }
1606 
1607         /* Iterate over candidate debug images.
1608          * On the first pass, only load images if they have a full symtab.
1609          * Failing that, do a second pass where we accept .dynsym also
1610          */
1611         want_symtab = 1;
1612 restart:
1613         for (dso->symtab_type = SYMTAB__BUILD_ID_CACHE;
1614              dso->symtab_type != SYMTAB__NOT_FOUND;
1615              dso->symtab_type++) {
1616                 switch (dso->symtab_type) {
1617                 case SYMTAB__BUILD_ID_CACHE:
1618                         /* skip the locally configured cache if a symfs is given */
1619                         if (symbol_conf.symfs[0] ||
1620                             (dso__build_id_filename(dso, name, size) == NULL)) {
1621                                 continue;
1622                         }
1623                         break;
1624                 case SYMTAB__FEDORA_DEBUGINFO:
1625                         snprintf(name, size, "%s/usr/lib/debug%s.debug",
1626                                  symbol_conf.symfs, dso->long_name);
1627                         break;
1628                 case SYMTAB__UBUNTU_DEBUGINFO:
1629                         snprintf(name, size, "%s/usr/lib/debug%s",
1630                                  symbol_conf.symfs, dso->long_name);
1631                         break;
1632                 case SYMTAB__BUILDID_DEBUGINFO: {
1633                         char build_id_hex[BUILD_ID_SIZE * 2 + 1];
1634 
1635                         if (!dso->has_build_id)
1636                                 continue;
1637 
1638                         build_id__sprintf(dso->build_id,
1639                                           sizeof(dso->build_id),
1640                                           build_id_hex);
1641                         snprintf(name, size,
1642                                  "%s/usr/lib/debug/.build-id/%.2s/%s.debug",
1643                                  symbol_conf.symfs, build_id_hex, build_id_hex + 2);
1644                         }
1645                         break;
1646                 case SYMTAB__SYSTEM_PATH_DSO:
1647                         snprintf(name, size, "%s%s",
1648                              symbol_conf.symfs, dso->long_name);
1649                         break;
1650                 case SYMTAB__GUEST_KMODULE:
1651                         if (map->groups && machine)
1652                                 root_dir = machine->root_dir;
1653                         else
1654                                 root_dir = "";
1655                         snprintf(name, size, "%s%s%s", symbol_conf.symfs,
1656                                  root_dir, dso->long_name);
1657                         break;
1658 
1659                 case SYMTAB__SYSTEM_PATH_KMODULE:
1660                         snprintf(name, size, "%s%s", symbol_conf.symfs,
1661                                  dso->long_name);
1662                         break;
1663                 default:;
1664                 }
1665 
1666                 /* Name is now the name of the next image to try */
1667                 fd = open(name, O_RDONLY);
1668                 if (fd < 0)
1669                         continue;
1670 
1671                 ret = dso__load_sym(dso, map, name, fd, filter, 0,
1672                                     want_symtab);
1673                 close(fd);
1674 
1675                 /*
1676                  * Some people seem to have debuginfo files _WITHOUT_ debug
1677                  * info!?!?
1678                  */
1679                 if (!ret)
1680                         continue;
1681 
1682                 if (ret > 0) {
1683                         int nr_plt = dso__synthesize_plt_symbols(dso, map,
1684                                                                  filter);
1685                         if (nr_plt > 0)
1686                                 ret += nr_plt;
1687                         break;
1688                 }
1689         }
1690 
1691         /*
1692          * If we wanted a full symtab but no image had one,
1693          * relax our requirements and repeat the search.
1694          */
1695         if (ret <= 0 && want_symtab) {
1696                 want_symtab = 0;
1697                 goto restart;
1698         }
1699 
1700         free(name);
1701         if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1702                 return 0;
1703         return ret;
1704 }
1705 
1706 struct map *map_groups__find_by_name(struct map_groups *mg,
1707                                      enum map_type type, const char *name)
1708 {
1709         struct rb_node *nd;
1710 
1711         for (nd = rb_first(&mg->maps[type]); nd; nd = rb_next(nd)) {
1712                 struct map *map = rb_entry(nd, struct map, rb_node);
1713 
1714                 if (map->dso && strcmp(map->dso->short_name, name) == 0)
1715                         return map;
1716         }
1717 
1718         return NULL;
1719 }
1720 
1721 static int dso__kernel_module_get_build_id(struct dso *dso,
1722                                            const char *root_dir)
1723 {
1724         char filename[PATH_MAX];
1725         /*
1726          * kernel module short names are of the form "[module]" and
1727          * we need just "module" here.
1728          */
1729         const char *name = dso->short_name + 1;
1730 
1731         snprintf(filename, sizeof(filename),
1732                  "%s/sys/module/%.*s/notes/.note.gnu.build-id",
1733                  root_dir, (int)strlen(name) - 1, name);
1734 
1735         if (sysfs__read_build_id(filename, dso->build_id,
1736                                  sizeof(dso->build_id)) == 0)
1737                 dso->has_build_id = true;
1738 
1739         return 0;
1740 }
1741 
1742 static int map_groups__set_modules_path_dir(struct map_groups *mg,
1743                                 const char *dir_name)
1744 {
1745         struct dirent *dent;
1746         DIR *dir = opendir(dir_name);
1747         int ret = 0;
1748 
1749         if (!dir) {
1750                 pr_debug("%s: cannot open %s dir\n", __func__, dir_name);
1751                 return -1;
1752         }
1753 
1754         while ((dent = readdir(dir)) != NULL) {
1755                 char path[PATH_MAX];
1756                 struct stat st;
1757 
1758                 /*sshfs might return bad dent->d_type, so we have to stat*/
1759                 snprintf(path, sizeof(path), "%s/%s", dir_name, dent->d_name);
1760                 if (stat(path, &st))
1761                         continue;
1762 
1763                 if (S_ISDIR(st.st_mode)) {
1764                         if (!strcmp(dent->d_name, ".") ||
1765                             !strcmp(dent->d_name, ".."))
1766                                 continue;
1767 
1768                         ret = map_groups__set_modules_path_dir(mg, path);
1769                         if (ret < 0)
1770                                 goto out;
1771                 } else {
1772                         char *dot = strrchr(dent->d_name, '.'),
1773                              dso_name[PATH_MAX];
1774                         struct map *map;
1775                         char *long_name;
1776 
1777                         if (dot == NULL || strcmp(dot, ".ko"))
1778                                 continue;
1779                         snprintf(dso_name, sizeof(dso_name), "[%.*s]",
1780                                  (int)(dot - dent->d_name), dent->d_name);
1781 
1782                         strxfrchar(dso_name, '-', '_');
1783                         map = map_groups__find_by_name(mg, MAP__FUNCTION,
1784                                                        dso_name);
1785                         if (map == NULL)
1786                                 continue;
1787 
1788                         long_name = strdup(path);
1789                         if (long_name == NULL) {
1790                                 ret = -1;
1791                                 goto out;
1792                         }
1793                         dso__set_long_name(map->dso, long_name);
1794                         map->dso->lname_alloc = 1;
1795                         dso__kernel_module_get_build_id(map->dso, "");
1796                 }
1797         }
1798 
1799 out:
1800         closedir(dir);
1801         return ret;
1802 }
1803 
1804 static char *get_kernel_version(const char *root_dir)
1805 {
1806         char version[PATH_MAX];
1807         FILE *file;
1808         char *name, *tmp;
1809         const char *prefix = "Linux version ";
1810 
1811         sprintf(version, "%s/proc/version", root_dir);
1812         file = fopen(version, "r");
1813         if (!file)
1814                 return NULL;
1815 
1816         version[0] = '\0';
1817         tmp = fgets(version, sizeof(version), file);
1818         fclose(file);
1819 
1820         name = strstr(version, prefix);
1821         if (!name)
1822                 return NULL;
1823         name += strlen(prefix);
1824         tmp = strchr(name, ' ');
1825         if (tmp)
1826                 *tmp = '\0';
1827 
1828         return strdup(name);
1829 }
1830 
1831 static int machine__set_modules_path(struct machine *machine)
1832 {
1833         char *version;
1834         char modules_path[PATH_MAX];
1835 
1836         version = get_kernel_version(machine->root_dir);
1837         if (!version)
1838                 return -1;
1839 
1840         snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s/kernel",
1841                  machine->root_dir, version);
1842         free(version);
1843 
1844         return map_groups__set_modules_path_dir(&machine->kmaps, modules_path);
1845 }
1846 
1847 /*
1848  * Constructor variant for modules (where we know from /proc/modules where
1849  * they are loaded) and for vmlinux, where only after we load all the
1850  * symbols we'll know where it starts and ends.
1851  */
1852 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type)
1853 {
1854         struct map *map = calloc(1, (sizeof(*map) +
1855                                      (dso->kernel ? sizeof(struct kmap) : 0)));
1856         if (map != NULL) {
1857                 /*
1858                  * ->end will be filled after we load all the symbols
1859                  */
1860                 map__init(map, type, start, 0, 0, dso);
1861         }
1862 
1863         return map;
1864 }
1865 
1866 struct map *machine__new_module(struct machine *machine, u64 start,
1867                                 const char *filename)
1868 {
1869         struct map *map;
1870         struct dso *dso = __dsos__findnew(&machine->kernel_dsos, filename);
1871 
1872         if (dso == NULL)
1873                 return NULL;
1874 
1875         map = map__new2(start, dso, MAP__FUNCTION);
1876         if (map == NULL)
1877                 return NULL;
1878 
1879         if (machine__is_host(machine))
1880                 dso->symtab_type = SYMTAB__SYSTEM_PATH_KMODULE;
1881         else
1882                 dso->symtab_type = SYMTAB__GUEST_KMODULE;
1883         map_groups__insert(&machine->kmaps, map);
1884         return map;
1885 }
1886 
1887 static int machine__create_modules(struct machine *machine)
1888 {
1889         char *line = NULL;
1890         size_t n;
1891         FILE *file;
1892         struct map *map;
1893         const char *modules;
1894         char path[PATH_MAX];
1895 
1896         if (machine__is_default_guest(machine))
1897                 modules = symbol_conf.default_guest_modules;
1898         else {
1899                 sprintf(path, "%s/proc/modules", machine->root_dir);
1900                 modules = path;
1901         }
1902 
1903         if (symbol__restricted_filename(path, "/proc/modules"))
1904                 return -1;
1905 
1906         file = fopen(modules, "r");
1907         if (file == NULL)
1908                 return -1;
1909 
1910         while (!feof(file)) {
1911                 char name[PATH_MAX];
1912                 u64 start;
1913                 char *sep;
1914                 int line_len;
1915 
1916                 line_len = getline(&line, &n, file);
1917                 if (line_len < 0)
1918                         break;
1919 
1920                 if (!line)
1921                         goto out_failure;
1922 
1923                 line[--line_len] = '\0'; /* \n */
1924 
1925                 sep = strrchr(line, 'x');
1926                 if (sep == NULL)
1927                         continue;
1928 
1929                 hex2u64(sep + 1, &start);
1930 
1931                 sep = strchr(line, ' ');
1932                 if (sep == NULL)
1933                         continue;
1934 
1935                 *sep = '\0';
1936 
1937                 snprintf(name, sizeof(name), "[%s]", line);
1938                 map = machine__new_module(machine, start, name);
1939                 if (map == NULL)
1940                         goto out_delete_line;
1941                 dso__kernel_module_get_build_id(map->dso, machine->root_dir);
1942         }
1943 
1944         free(line);
1945         fclose(file);
1946 
1947         return machine__set_modules_path(machine);
1948 
1949 out_delete_line:
1950         free(line);
1951 out_failure:
1952         return -1;
1953 }
1954 
1955 int dso__load_vmlinux(struct dso *dso, struct map *map,
1956                       const char *vmlinux, symbol_filter_t filter)
1957 {
1958         int err = -1, fd;
1959         char symfs_vmlinux[PATH_MAX];
1960 
1961         snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s%s",
1962                  symbol_conf.symfs, vmlinux);
1963         fd = open(symfs_vmlinux, O_RDONLY);
1964         if (fd < 0)
1965                 return -1;
1966 
1967         dso__set_long_name(dso, (char *)vmlinux);
1968         dso__set_loaded(dso, map->type);
1969         err = dso__load_sym(dso, map, symfs_vmlinux, fd, filter, 0, 0);
1970         close(fd);
1971 
1972         if (err > 0)
1973                 pr_debug("Using %s for symbols\n", symfs_vmlinux);
1974 
1975         return err;
1976 }
1977 
1978 int dso__load_vmlinux_path(struct dso *dso, struct map *map,
1979                            symbol_filter_t filter)
1980 {
1981         int i, err = 0;
1982         char *filename;
1983 
1984         pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1985                  vmlinux_path__nr_entries + 1);
1986 
1987         filename = dso__build_id_filename(dso, NULL, 0);
1988         if (filename != NULL) {
1989                 err = dso__load_vmlinux(dso, map, filename, filter);
1990                 if (err > 0) {
1991                         dso__set_long_name(dso, filename);
1992                         goto out;
1993                 }
1994                 free(filename);
1995         }
1996 
1997         for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1998                 err = dso__load_vmlinux(dso, map, vmlinux_path[i], filter);
1999                 if (err > 0) {
2000                         dso__set_long_name(dso, strdup(vmlinux_path[i]));
2001                         break;
2002                 }
2003         }
2004 out:
2005         return err;
2006 }
2007 
2008 static int dso__load_kernel_sym(struct dso *dso, struct map *map,
2009                                 symbol_filter_t filter)
2010 {
2011         int err;
2012         const char *kallsyms_filename = NULL;
2013         char *kallsyms_allocated_filename = NULL;
2014         /*
2015          * Step 1: if the user specified a kallsyms or vmlinux filename, use
2016          * it and only it, reporting errors to the user if it cannot be used.
2017          *
2018          * For instance, try to analyse an ARM perf.data file _without_ a
2019          * build-id, or if the user specifies the wrong path to the right
2020          * vmlinux file, obviously we can't fallback to another vmlinux (a
2021          * x86_86 one, on the machine where analysis is being performed, say),
2022          * or worse, /proc/kallsyms.
2023          *
2024          * If the specified file _has_ a build-id and there is a build-id
2025          * section in the perf.data file, we will still do the expected
2026          * validation in dso__load_vmlinux and will bail out if they don't
2027          * match.
2028          */
2029         if (symbol_conf.kallsyms_name != NULL) {
2030                 kallsyms_filename = symbol_conf.kallsyms_name;
2031                 goto do_kallsyms;
2032         }
2033 
2034         if (symbol_conf.vmlinux_name != NULL) {
2035                 err = dso__load_vmlinux(dso, map,
2036                                         symbol_conf.vmlinux_name, filter);
2037                 if (err > 0) {
2038                         dso__set_long_name(dso,
2039                                            strdup(symbol_conf.vmlinux_name));
2040                         goto out_fixup;
2041                 }
2042                 return err;
2043         }
2044 
2045         if (vmlinux_path != NULL) {
2046                 err = dso__load_vmlinux_path(dso, map, filter);
2047                 if (err > 0)
2048                         goto out_fixup;
2049         }
2050 
2051         /* do not try local files if a symfs was given */
2052         if (symbol_conf.symfs[0] != 0)
2053                 return -1;
2054 
2055         /*
2056          * Say the kernel DSO was created when processing the build-id header table,
2057          * we have a build-id, so check if it is the same as the running kernel,
2058          * using it if it is.
2059          */
2060         if (dso->has_build_id) {
2061                 u8 kallsyms_build_id[BUILD_ID_SIZE];
2062                 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
2063 
2064                 if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id,
2065                                          sizeof(kallsyms_build_id)) == 0) {
2066                         if (dso__build_id_equal(dso, kallsyms_build_id)) {
2067                                 kallsyms_filename = "/proc/kallsyms";
2068                                 goto do_kallsyms;
2069                         }
2070                 }
2071                 /*
2072                  * Now look if we have it on the build-id cache in
2073                  * $HOME/.debug/[kernel.kallsyms].
2074                  */
2075                 build_id__sprintf(dso->build_id, sizeof(dso->build_id),
2076                                   sbuild_id);
2077 
2078                 if (asprintf(&kallsyms_allocated_filename,
2079                              "%s/.debug/[kernel.kallsyms]/%s",
2080                              getenv("HOME"), sbuild_id) == -1) {
2081                         pr_err("Not enough memory for kallsyms file lookup\n");
2082                         return -1;
2083                 }
2084 
2085                 kallsyms_filename = kallsyms_allocated_filename;
2086 
2087                 if (access(kallsyms_filename, F_OK)) {
2088                         pr_err("No kallsyms or vmlinux with build-id %s "
2089                                "was found\n", sbuild_id);
2090                         free(kallsyms_allocated_filename);
2091                         return -1;
2092                 }
2093         } else {
2094                 /*
2095                  * Last resort, if we don't have a build-id and couldn't find
2096                  * any vmlinux file, try the running kernel kallsyms table.
2097                  */
2098                 kallsyms_filename = "/proc/kallsyms";
2099         }
2100 
2101 do_kallsyms:
2102         err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
2103         if (err > 0)
2104                 pr_debug("Using %s for symbols\n", kallsyms_filename);
2105         free(kallsyms_allocated_filename);
2106 
2107         if (err > 0) {
2108 out_fixup:
2109                 if (kallsyms_filename != NULL)
2110                         dso__set_long_name(dso, strdup("[kernel.kallsyms]"));
2111                 map__fixup_start(map);
2112                 map__fixup_end(map);
2113         }
2114 
2115         return err;
2116 }
2117 
2118 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
2119                                       symbol_filter_t filter)
2120 {
2121         int err;
2122         const char *kallsyms_filename = NULL;
2123         struct machine *machine;
2124         char path[PATH_MAX];
2125 
2126         if (!map->groups) {
2127                 pr_debug("Guest kernel map hasn't the point to groups\n");
2128                 return -1;
2129         }
2130         machine = map->groups->machine;
2131 
2132         if (machine__is_default_guest(machine)) {
2133                 /*
2134                  * if the user specified a vmlinux filename, use it and only
2135                  * it, reporting errors to the user if it cannot be used.
2136                  * Or use file guest_kallsyms inputted by user on commandline
2137                  */
2138                 if (symbol_conf.default_guest_vmlinux_name != NULL) {
2139                         err = dso__load_vmlinux(dso, map,
2140                                 symbol_conf.default_guest_vmlinux_name, filter);
2141                         goto out_try_fixup;
2142                 }
2143 
2144                 kallsyms_filename = symbol_conf.default_guest_kallsyms;
2145                 if (!kallsyms_filename)
2146                         return -1;
2147         } else {
2148                 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2149                 kallsyms_filename = path;
2150         }
2151 
2152         err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
2153         if (err > 0)
2154                 pr_debug("Using %s for symbols\n", kallsyms_filename);
2155 
2156 out_try_fixup:
2157         if (err > 0) {
2158                 if (kallsyms_filename != NULL) {
2159                         machine__mmap_name(machine, path, sizeof(path));
2160                         dso__set_long_name(dso, strdup(path));
2161                 }
2162                 map__fixup_start(map);
2163                 map__fixup_end(map);
2164         }
2165 
2166         return err;
2167 }
2168 
2169 static void dsos__add(struct list_head *head, struct dso *dso)
2170 {
2171         list_add_tail(&dso->node, head);
2172 }
2173 
2174 static struct dso *dsos__find(struct list_head *head, const char *name)
2175 {
2176         struct dso *pos;
2177 
2178         list_for_each_entry(pos, head, node)
2179                 if (strcmp(pos->long_name, name) == 0)
2180                         return pos;
2181         return NULL;
2182 }
2183 
2184 struct dso *__dsos__findnew(struct list_head *head, const char *name)
2185 {
2186         struct dso *dso = dsos__find(head, name);
2187 
2188         if (!dso) {
2189                 dso = dso__new(name);
2190                 if (dso != NULL) {
2191                         dsos__add(head, dso);
2192                         dso__set_basename(dso);
2193                 }
2194         }
2195 
2196         return dso;
2197 }
2198 
2199 size_t __dsos__fprintf(struct list_head *head, FILE *fp)
2200 {
2201         struct dso *pos;
2202         size_t ret = 0;
2203 
2204         list_for_each_entry(pos, head, node) {
2205                 int i;
2206                 for (i = 0; i < MAP__NR_TYPES; ++i)
2207                         ret += dso__fprintf(pos, i, fp);
2208         }
2209 
2210         return ret;
2211 }
2212 
2213 size_t machines__fprintf_dsos(struct rb_root *machines, FILE *fp)
2214 {
2215         struct rb_node *nd;
2216         size_t ret = 0;
2217 
2218         for (nd = rb_first(machines); nd; nd = rb_next(nd)) {
2219                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
2220                 ret += __dsos__fprintf(&pos->kernel_dsos, fp);
2221                 ret += __dsos__fprintf(&pos->user_dsos, fp);
2222         }
2223 
2224         return ret;
2225 }
2226 
2227 static size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp,
2228                                       bool with_hits)
2229 {
2230         struct dso *pos;
2231         size_t ret = 0;
2232 
2233         list_for_each_entry(pos, head, node) {
2234                 if (with_hits && !pos->hit)
2235                         continue;
2236                 ret += dso__fprintf_buildid(pos, fp);
2237                 ret += fprintf(fp, " %s\n", pos->long_name);
2238         }
2239         return ret;
2240 }
2241 
2242 size_t machine__fprintf_dsos_buildid(struct machine *machine, FILE *fp,
2243                                      bool with_hits)
2244 {
2245         return __dsos__fprintf_buildid(&machine->kernel_dsos, fp, with_hits) +
2246                __dsos__fprintf_buildid(&machine->user_dsos, fp, with_hits);
2247 }
2248 
2249 size_t machines__fprintf_dsos_buildid(struct rb_root *machines,
2250                                       FILE *fp, bool with_hits)
2251 {
2252         struct rb_node *nd;
2253         size_t ret = 0;
2254 
2255         for (nd = rb_first(machines); nd; nd = rb_next(nd)) {
2256                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
2257                 ret += machine__fprintf_dsos_buildid(pos, fp, with_hits);
2258         }
2259         return ret;
2260 }
2261 
2262 static struct dso*
2263 dso__kernel_findnew(struct machine *machine, const char *name,
2264                     const char *short_name, int dso_type)
2265 {
2266         /*
2267          * The kernel dso could be created by build_id processing.
2268          */
2269         struct dso *dso = __dsos__findnew(&machine->kernel_dsos, name);
2270 
2271         /*
2272          * We need to run this in all cases, since during the build_id
2273          * processing we had no idea this was the kernel dso.
2274          */
2275         if (dso != NULL) {
2276                 dso__set_short_name(dso, short_name);
2277                 dso->kernel = dso_type;
2278         }
2279 
2280         return dso;
2281 }
2282 
2283 void dso__read_running_kernel_build_id(struct dso *dso, struct machine *machine)
2284 {
2285         char path[PATH_MAX];
2286 
2287         if (machine__is_default_guest(machine))
2288                 return;
2289         sprintf(path, "%s/sys/kernel/notes", machine->root_dir);
2290         if (sysfs__read_build_id(path, dso->build_id,
2291                                  sizeof(dso->build_id)) == 0)
2292                 dso->has_build_id = true;
2293 }
2294 
2295 static struct dso *machine__get_kernel(struct machine *machine)
2296 {
2297         const char *vmlinux_name = NULL;
2298         struct dso *kernel;
2299 
2300         if (machine__is_host(machine)) {
2301                 vmlinux_name = symbol_conf.vmlinux_name;
2302                 if (!vmlinux_name)
2303                         vmlinux_name = "[kernel.kallsyms]";
2304 
2305                 kernel = dso__kernel_findnew(machine, vmlinux_name,
2306                                              "[kernel]",
2307                                              DSO_TYPE_KERNEL);
2308         } else {
2309                 char bf[PATH_MAX];
2310 
2311                 if (machine__is_default_guest(machine))
2312                         vmlinux_name = symbol_conf.default_guest_vmlinux_name;
2313                 if (!vmlinux_name)
2314                         vmlinux_name = machine__mmap_name(machine, bf,
2315                                                           sizeof(bf));
2316 
2317                 kernel = dso__kernel_findnew(machine, vmlinux_name,
2318                                              "[guest.kernel]",
2319                                              DSO_TYPE_GUEST_KERNEL);
2320         }
2321 
2322         if (kernel != NULL && (!kernel->has_build_id))
2323                 dso__read_running_kernel_build_id(kernel, machine);
2324 
2325         return kernel;
2326 }
2327 
2328 struct process_args {
2329         u64 start;
2330 };
2331 
2332 static int symbol__in_kernel(void *arg, const char *name,
2333                              char type __used, u64 start, u64 end __used)
2334 {
2335         struct process_args *args = arg;
2336 
2337         if (strchr(name, '['))
2338                 return 0;
2339 
2340         args->start = start;
2341         return 1;
2342 }
2343 
2344 /* Figure out the start address of kernel map from /proc/kallsyms */
2345 static u64 machine__get_kernel_start_addr(struct machine *machine)
2346 {
2347         const char *filename;
2348         char path[PATH_MAX];
2349         struct process_args args;
2350 
2351         if (machine__is_host(machine)) {
2352                 filename = "/proc/kallsyms";
2353         } else {
2354                 if (machine__is_default_guest(machine))
2355                         filename = (char *)symbol_conf.default_guest_kallsyms;
2356                 else {
2357                         sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2358                         filename = path;
2359                 }
2360         }
2361 
2362         if (symbol__restricted_filename(filename, "/proc/kallsyms"))
2363                 return 0;
2364 
2365         if (kallsyms__parse(filename, &args, symbol__in_kernel) <= 0)
2366                 return 0;
2367 
2368         return args.start;
2369 }
2370 
2371 int __machine__create_kernel_maps(struct machine *machine, struct dso *kernel)
2372 {
2373         enum map_type type;
2374         u64 start = machine__get_kernel_start_addr(machine);
2375 
2376         for (type = 0; type < MAP__NR_TYPES; ++type) {
2377                 struct kmap *kmap;
2378 
2379                 machine->vmlinux_maps[type] = map__new2(start, kernel, type);
2380                 if (machine->vmlinux_maps[type] == NULL)
2381                         return -1;
2382 
2383                 machine->vmlinux_maps[type]->map_ip =
2384                         machine->vmlinux_maps[type]->unmap_ip =
2385                                 identity__map_ip;
2386                 kmap = map__kmap(machine->vmlinux_maps[type]);
2387                 kmap->kmaps = &machine->kmaps;
2388                 map_groups__insert(&machine->kmaps,
2389                                    machine->vmlinux_maps[type]);
2390         }
2391 
2392         return 0;
2393 }
2394 
2395 void machine__destroy_kernel_maps(struct machine *machine)
2396 {
2397         enum map_type type;
2398 
2399         for (type = 0; type < MAP__NR_TYPES; ++type) {
2400                 struct kmap *kmap;
2401 
2402                 if (machine->vmlinux_maps[type] == NULL)
2403                         continue;
2404 
2405                 kmap = map__kmap(machine->vmlinux_maps[type]);
2406                 map_groups__remove(&machine->kmaps,
2407                                    machine->vmlinux_maps[type]);
2408                 if (kmap->ref_reloc_sym) {
2409                         /*
2410                          * ref_reloc_sym is shared among all maps, so free just
2411                          * on one of them.
2412                          */
2413                         if (type == MAP__FUNCTION) {
2414                                 free((char *)kmap->ref_reloc_sym->name);
2415                                 kmap->ref_reloc_sym->name = NULL;
2416                                 free(kmap->ref_reloc_sym);
2417                         }
2418                         kmap->ref_reloc_sym = NULL;
2419                 }
2420 
2421                 map__delete(machine->vmlinux_maps[type]);
2422                 machine->vmlinux_maps[type] = NULL;
2423         }
2424 }
2425 
2426 int machine__create_kernel_maps(struct machine *machine)
2427 {
2428         struct dso *kernel = machine__get_kernel(machine);
2429 
2430         if (kernel == NULL ||
2431             __machine__create_kernel_maps(machine, kernel) < 0)
2432                 return -1;
2433 
2434         if (symbol_conf.use_modules && machine__create_modules(machine) < 0)
2435                 pr_debug("Problems creating module maps, continuing anyway...\n");
2436         /*
2437          * Now that we have all the maps created, just set the ->end of them:
2438          */
2439         map_groups__fixup_end(&machine->kmaps);
2440         return 0;
2441 }
2442 
2443 static void vmlinux_path__exit(void)
2444 {
2445         while (--vmlinux_path__nr_entries >= 0) {
2446                 free(vmlinux_path[vmlinux_path__nr_entries]);
2447                 vmlinux_path[vmlinux_path__nr_entries] = NULL;
2448         }
2449 
2450         free(vmlinux_path);
2451         vmlinux_path = NULL;
2452 }
2453 
2454 static int vmlinux_path__init(void)
2455 {
2456         struct utsname uts;
2457         char bf[PATH_MAX];
2458 
2459         vmlinux_path = malloc(sizeof(char *) * 5);
2460         if (vmlinux_path == NULL)
2461                 return -1;
2462 
2463         vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
2464         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2465                 goto out_fail;
2466         ++vmlinux_path__nr_entries;
2467         vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
2468         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2469                 goto out_fail;
2470         ++vmlinux_path__nr_entries;
2471 
2472         /* only try running kernel version if no symfs was given */
2473         if (symbol_conf.symfs[0] != 0)
2474                 return 0;
2475 
2476         if (uname(&uts) < 0)
2477                 return -1;
2478 
2479         snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
2480         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2481         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2482                 goto out_fail;
2483         ++vmlinux_path__nr_entries;
2484         snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release);
2485         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2486         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2487                 goto out_fail;
2488         ++vmlinux_path__nr_entries;
2489         snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
2490                  uts.release);
2491         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2492         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2493                 goto out_fail;
2494         ++vmlinux_path__nr_entries;
2495 
2496         return 0;
2497 
2498 out_fail:
2499         vmlinux_path__exit();
2500         return -1;
2501 }
2502 
2503 size_t machine__fprintf_vmlinux_path(struct machine *machine, FILE *fp)
2504 {
2505         int i;
2506         size_t printed = 0;
2507         struct dso *kdso = machine->vmlinux_maps[MAP__FUNCTION]->dso;
2508 
2509         if (kdso->has_build_id) {
2510                 char filename[PATH_MAX];
2511                 if (dso__build_id_filename(kdso, filename, sizeof(filename)))
2512                         printed += fprintf(fp, "[0] %s\n", filename);
2513         }
2514 
2515         for (i = 0; i < vmlinux_path__nr_entries; ++i)
2516                 printed += fprintf(fp, "[%d] %s\n",
2517                                    i + kdso->has_build_id, vmlinux_path[i]);
2518 
2519         return printed;
2520 }
2521 
2522 static int setup_list(struct strlist **list, const char *list_str,
2523                       const char *list_name)
2524 {
2525         if (list_str == NULL)
2526                 return 0;
2527 
2528         *list = strlist__new(true, list_str);
2529         if (!*list) {
2530                 pr_err("problems parsing %s list\n", list_name);
2531                 return -1;
2532         }
2533         return 0;
2534 }
2535 
2536 static bool symbol__read_kptr_restrict(void)
2537 {
2538         bool value = false;
2539 
2540         if (geteuid() != 0) {
2541                 FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
2542                 if (fp != NULL) {
2543                         char line[8];
2544 
2545                         if (fgets(line, sizeof(line), fp) != NULL)
2546                                 value = atoi(line) != 0;
2547 
2548                         fclose(fp);
2549                 }
2550         }
2551 
2552         return value;
2553 }
2554 
2555 int symbol__init(void)
2556 {
2557         const char *symfs;
2558 
2559         if (symbol_conf.initialized)
2560                 return 0;
2561 
2562         symbol_conf.priv_size = ALIGN(symbol_conf.priv_size, sizeof(u64));
2563 
2564         elf_version(EV_CURRENT);
2565         if (symbol_conf.sort_by_name)
2566                 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
2567                                           sizeof(struct symbol));
2568 
2569         if (symbol_conf.try_vmlinux_path && vmlinux_path__init() < 0)
2570                 return -1;
2571 
2572         if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
2573                 pr_err("'.' is the only non valid --field-separator argument\n");
2574                 return -1;
2575         }
2576 
2577         if (setup_list(&symbol_conf.dso_list,
2578                        symbol_conf.dso_list_str, "dso") < 0)
2579                 return -1;
2580 
2581         if (setup_list(&symbol_conf.comm_list,
2582                        symbol_conf.comm_list_str, "comm") < 0)
2583                 goto out_free_dso_list;
2584 
2585         if (setup_list(&symbol_conf.sym_list,
2586                        symbol_conf.sym_list_str, "symbol") < 0)
2587                 goto out_free_comm_list;
2588 
2589         /*
2590          * A path to symbols of "/" is identical to ""
2591          * reset here for simplicity.
2592          */
2593         symfs = realpath(symbol_conf.symfs, NULL);
2594         if (symfs == NULL)
2595                 symfs = symbol_conf.symfs;
2596         if (strcmp(symfs, "/") == 0)
2597                 symbol_conf.symfs = "";
2598         if (symfs != symbol_conf.symfs)
2599                 free((void *)symfs);
2600 
2601         symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
2602 
2603         symbol_conf.initialized = true;
2604         return 0;
2605 
2606 out_free_comm_list:
2607         strlist__delete(symbol_conf.comm_list);
2608 out_free_dso_list:
2609         strlist__delete(symbol_conf.dso_list);
2610         return -1;
2611 }
2612 
2613 void symbol__exit(void)
2614 {
2615         if (!symbol_conf.initialized)
2616                 return;
2617         strlist__delete(symbol_conf.sym_list);
2618         strlist__delete(symbol_conf.dso_list);
2619         strlist__delete(symbol_conf.comm_list);
2620         vmlinux_path__exit();
2621         symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2622         symbol_conf.initialized = false;
2623 }
2624 
2625 int machines__create_kernel_maps(struct rb_root *machines, pid_t pid)
2626 {
2627         struct machine *machine = machines__findnew(machines, pid);
2628 
2629         if (machine == NULL)
2630                 return -1;
2631 
2632         return machine__create_kernel_maps(machine);
2633 }
2634 
2635 static int hex(char ch)
2636 {
2637         if ((ch >= '') && (ch <= '9'))
2638                 return ch - '';
2639         if ((ch >= 'a') && (ch <= 'f'))
2640                 return ch - 'a' + 10;
2641         if ((ch >= 'A') && (ch <= 'F'))
2642                 return ch - 'A' + 10;
2643         return -1;
2644 }
2645 
2646 /*
2647  * While we find nice hex chars, build a long_val.
2648  * Return number of chars processed.
2649  */
2650 int hex2u64(const char *ptr, u64 *long_val)
2651 {
2652         const char *p = ptr;
2653         *long_val = 0;
2654 
2655         while (*p) {
2656                 const int hex_val = hex(*p);
2657 
2658                 if (hex_val < 0)
2659                         break;
2660 
2661                 *long_val = (*long_val << 4) | hex_val;
2662                 p++;
2663         }
2664 
2665         return p - ptr;
2666 }
2667 
2668 char *strxfrchar(char *s, char from, char to)
2669 {
2670         char *p = s;
2671 
2672         while ((p = strchr(p, from)) != NULL)
2673                 *p++ = to;
2674 
2675         return s;
2676 }
2677 
2678 int machines__create_guest_kernel_maps(struct rb_root *machines)
2679 {
2680         int ret = 0;
2681         struct dirent **namelist = NULL;
2682         int i, items = 0;
2683         char path[PATH_MAX];
2684         pid_t pid;
2685 
2686         if (symbol_conf.default_guest_vmlinux_name ||
2687             symbol_conf.default_guest_modules ||
2688             symbol_conf.default_guest_kallsyms) {
2689                 machines__create_kernel_maps(machines, DEFAULT_GUEST_KERNEL_ID);
2690         }
2691 
2692         if (symbol_conf.guestmount) {
2693                 items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL);
2694                 if (items <= 0)
2695                         return -ENOENT;
2696                 for (i = 0; i < items; i++) {
2697                         if (!isdigit(namelist[i]->d_name[0])) {
2698                                 /* Filter out . and .. */
2699                                 continue;
2700                         }
2701                         pid = atoi(namelist[i]->d_name);
2702                         sprintf(path, "%s/%s/proc/kallsyms",
2703                                 symbol_conf.guestmount,
2704                                 namelist[i]->d_name);
2705                         ret = access(path, R_OK);
2706                         if (ret) {
2707                                 pr_debug("Can't access file %s\n", path);
2708                                 goto failure;
2709                         }
2710                         machines__create_kernel_maps(machines, pid);
2711                 }
2712 failure:
2713                 free(namelist);
2714         }
2715 
2716         return ret;
2717 }
2718 
2719 void machines__destroy_guest_kernel_maps(struct rb_root *machines)
2720 {
2721         struct rb_node *next = rb_first(machines);
2722 
2723         while (next) {
2724                 struct machine *pos = rb_entry(next, struct machine, rb_node);
2725 
2726                 next = rb_next(&pos->rb_node);
2727                 rb_erase(&pos->rb_node, machines);
2728                 machine__delete(pos);
2729         }
2730 }
2731 
2732 int machine__load_kallsyms(struct machine *machine, const char *filename,
2733                            enum map_type type, symbol_filter_t filter)
2734 {
2735         struct map *map = machine->vmlinux_maps[type];
2736         int ret = dso__load_kallsyms(map->dso, filename, map, filter);
2737 
2738         if (ret > 0) {
2739                 dso__set_loaded(map->dso, type);
2740                 /*
2741                  * Since /proc/kallsyms will have multiple sessions for the
2742                  * kernel, with modules between them, fixup the end of all
2743                  * sections.
2744                  */
2745                 __map_groups__fixup_end(&machine->kmaps, type);
2746         }
2747 
2748         return ret;
2749 }
2750 
2751 int machine__load_vmlinux_path(struct machine *machine, enum map_type type,
2752                                symbol_filter_t filter)
2753 {
2754         struct map *map = machine->vmlinux_maps[type];
2755         int ret = dso__load_vmlinux_path(map->dso, map, filter);
2756 
2757         if (ret > 0) {
2758                 dso__set_loaded(map->dso, type);
2759                 map__reloc_vmlinux(map);
2760         }
2761 
2762         return ret;
2763 }
2764 

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