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

Version: ~ [ linux-5.7-rc7 ] ~ [ linux-5.6.14 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.42 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.124 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.181 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.224 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.224 ] ~ [ 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-3.16.84 ] ~ [ 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-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 <dirent.h>
  2 #include <errno.h>
  3 #include <stdlib.h>
  4 #include <stdio.h>
  5 #include <string.h>
  6 #include <sys/types.h>
  7 #include <sys/stat.h>
  8 #include <sys/param.h>
  9 #include <fcntl.h>
 10 #include <unistd.h>
 11 #include <inttypes.h>
 12 #include "build-id.h"
 13 #include "util.h"
 14 #include "debug.h"
 15 #include "machine.h"
 16 #include "symbol.h"
 17 #include "strlist.h"
 18 
 19 #include <elf.h>
 20 #include <limits.h>
 21 #include <sys/utsname.h>
 22 
 23 #ifndef KSYM_NAME_LEN
 24 #define KSYM_NAME_LEN 256
 25 #endif
 26 
 27 static int dso__load_kernel_sym(struct dso *dso, struct map *map,
 28                                 symbol_filter_t filter);
 29 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
 30                         symbol_filter_t filter);
 31 int vmlinux_path__nr_entries;
 32 char **vmlinux_path;
 33 
 34 struct symbol_conf symbol_conf = {
 35         .use_modules      = true,
 36         .try_vmlinux_path = true,
 37         .annotate_src     = true,
 38         .demangle         = true,
 39         .symfs            = "",
 40 };
 41 
 42 static enum dso_binary_type binary_type_symtab[] = {
 43         DSO_BINARY_TYPE__KALLSYMS,
 44         DSO_BINARY_TYPE__GUEST_KALLSYMS,
 45         DSO_BINARY_TYPE__JAVA_JIT,
 46         DSO_BINARY_TYPE__DEBUGLINK,
 47         DSO_BINARY_TYPE__BUILD_ID_CACHE,
 48         DSO_BINARY_TYPE__FEDORA_DEBUGINFO,
 49         DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
 50         DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
 51         DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
 52         DSO_BINARY_TYPE__GUEST_KMODULE,
 53         DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE,
 54         DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
 55         DSO_BINARY_TYPE__NOT_FOUND,
 56 };
 57 
 58 #define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab)
 59 
 60 bool symbol_type__is_a(char symbol_type, enum map_type map_type)
 61 {
 62         symbol_type = toupper(symbol_type);
 63 
 64         switch (map_type) {
 65         case MAP__FUNCTION:
 66                 return symbol_type == 'T' || symbol_type == 'W';
 67         case MAP__VARIABLE:
 68                 return symbol_type == 'D';
 69         default:
 70                 return false;
 71         }
 72 }
 73 
 74 static int prefix_underscores_count(const char *str)
 75 {
 76         const char *tail = str;
 77 
 78         while (*tail == '_')
 79                 tail++;
 80 
 81         return tail - str;
 82 }
 83 
 84 #define SYMBOL_A 0
 85 #define SYMBOL_B 1
 86 
 87 static int choose_best_symbol(struct symbol *syma, struct symbol *symb)
 88 {
 89         s64 a;
 90         s64 b;
 91         size_t na, nb;
 92 
 93         /* Prefer a symbol with non zero length */
 94         a = syma->end - syma->start;
 95         b = symb->end - symb->start;
 96         if ((b == 0) && (a > 0))
 97                 return SYMBOL_A;
 98         else if ((a == 0) && (b > 0))
 99                 return SYMBOL_B;
100 
101         /* Prefer a non weak symbol over a weak one */
102         a = syma->binding == STB_WEAK;
103         b = symb->binding == STB_WEAK;
104         if (b && !a)
105                 return SYMBOL_A;
106         if (a && !b)
107                 return SYMBOL_B;
108 
109         /* Prefer a global symbol over a non global one */
110         a = syma->binding == STB_GLOBAL;
111         b = symb->binding == STB_GLOBAL;
112         if (a && !b)
113                 return SYMBOL_A;
114         if (b && !a)
115                 return SYMBOL_B;
116 
117         /* Prefer a symbol with less underscores */
118         a = prefix_underscores_count(syma->name);
119         b = prefix_underscores_count(symb->name);
120         if (b > a)
121                 return SYMBOL_A;
122         else if (a > b)
123                 return SYMBOL_B;
124 
125         /* Choose the symbol with the longest name */
126         na = strlen(syma->name);
127         nb = strlen(symb->name);
128         if (na > nb)
129                 return SYMBOL_A;
130         else if (na < nb)
131                 return SYMBOL_B;
132 
133         /* Avoid "SyS" kernel syscall aliases */
134         if (na >= 3 && !strncmp(syma->name, "SyS", 3))
135                 return SYMBOL_B;
136         if (na >= 10 && !strncmp(syma->name, "compat_SyS", 10))
137                 return SYMBOL_B;
138 
139         return SYMBOL_A;
140 }
141 
142 void symbols__fixup_duplicate(struct rb_root *symbols)
143 {
144         struct rb_node *nd;
145         struct symbol *curr, *next;
146 
147         nd = rb_first(symbols);
148 
149         while (nd) {
150                 curr = rb_entry(nd, struct symbol, rb_node);
151 again:
152                 nd = rb_next(&curr->rb_node);
153                 next = rb_entry(nd, struct symbol, rb_node);
154 
155                 if (!nd)
156                         break;
157 
158                 if (curr->start != next->start)
159                         continue;
160 
161                 if (choose_best_symbol(curr, next) == SYMBOL_A) {
162                         rb_erase(&next->rb_node, symbols);
163                         symbol__delete(next);
164                         goto again;
165                 } else {
166                         nd = rb_next(&curr->rb_node);
167                         rb_erase(&curr->rb_node, symbols);
168                         symbol__delete(curr);
169                 }
170         }
171 }
172 
173 void symbols__fixup_end(struct rb_root *symbols)
174 {
175         struct rb_node *nd, *prevnd = rb_first(symbols);
176         struct symbol *curr, *prev;
177 
178         if (prevnd == NULL)
179                 return;
180 
181         curr = rb_entry(prevnd, struct symbol, rb_node);
182 
183         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
184                 prev = curr;
185                 curr = rb_entry(nd, struct symbol, rb_node);
186 
187                 if (prev->end == prev->start && prev->end != curr->start)
188                         prev->end = curr->start - 1;
189         }
190 
191         /* Last entry */
192         if (curr->end == curr->start)
193                 curr->end = roundup(curr->start, 4096);
194 }
195 
196 void __map_groups__fixup_end(struct map_groups *mg, enum map_type type)
197 {
198         struct map *prev, *curr;
199         struct rb_node *nd, *prevnd = rb_first(&mg->maps[type]);
200 
201         if (prevnd == NULL)
202                 return;
203 
204         curr = rb_entry(prevnd, struct map, rb_node);
205 
206         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
207                 prev = curr;
208                 curr = rb_entry(nd, struct map, rb_node);
209                 prev->end = curr->start - 1;
210         }
211 
212         /*
213          * We still haven't the actual symbols, so guess the
214          * last map final address.
215          */
216         curr->end = ~0ULL;
217 }
218 
219 struct symbol *symbol__new(u64 start, u64 len, u8 binding, const char *name)
220 {
221         size_t namelen = strlen(name) + 1;
222         struct symbol *sym = calloc(1, (symbol_conf.priv_size +
223                                         sizeof(*sym) + namelen));
224         if (sym == NULL)
225                 return NULL;
226 
227         if (symbol_conf.priv_size)
228                 sym = ((void *)sym) + symbol_conf.priv_size;
229 
230         sym->start   = start;
231         sym->end     = len ? start + len - 1 : start;
232         sym->binding = binding;
233         sym->namelen = namelen - 1;
234 
235         pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n",
236                   __func__, name, start, sym->end);
237         memcpy(sym->name, name, namelen);
238 
239         return sym;
240 }
241 
242 void symbol__delete(struct symbol *sym)
243 {
244         free(((void *)sym) - symbol_conf.priv_size);
245 }
246 
247 size_t symbol__fprintf(struct symbol *sym, FILE *fp)
248 {
249         return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %c %s\n",
250                        sym->start, sym->end,
251                        sym->binding == STB_GLOBAL ? 'g' :
252                        sym->binding == STB_LOCAL  ? 'l' : 'w',
253                        sym->name);
254 }
255 
256 size_t symbol__fprintf_symname_offs(const struct symbol *sym,
257                                     const struct addr_location *al, FILE *fp)
258 {
259         unsigned long offset;
260         size_t length;
261 
262         if (sym && sym->name) {
263                 length = fprintf(fp, "%s", sym->name);
264                 if (al) {
265                         if (al->addr < sym->end)
266                                 offset = al->addr - sym->start;
267                         else
268                                 offset = al->addr - al->map->start - sym->start;
269                         length += fprintf(fp, "+0x%lx", offset);
270                 }
271                 return length;
272         } else
273                 return fprintf(fp, "[unknown]");
274 }
275 
276 size_t symbol__fprintf_symname(const struct symbol *sym, FILE *fp)
277 {
278         return symbol__fprintf_symname_offs(sym, NULL, fp);
279 }
280 
281 void symbols__delete(struct rb_root *symbols)
282 {
283         struct symbol *pos;
284         struct rb_node *next = rb_first(symbols);
285 
286         while (next) {
287                 pos = rb_entry(next, struct symbol, rb_node);
288                 next = rb_next(&pos->rb_node);
289                 rb_erase(&pos->rb_node, symbols);
290                 symbol__delete(pos);
291         }
292 }
293 
294 void symbols__insert(struct rb_root *symbols, struct symbol *sym)
295 {
296         struct rb_node **p = &symbols->rb_node;
297         struct rb_node *parent = NULL;
298         const u64 ip = sym->start;
299         struct symbol *s;
300 
301         while (*p != NULL) {
302                 parent = *p;
303                 s = rb_entry(parent, struct symbol, rb_node);
304                 if (ip < s->start)
305                         p = &(*p)->rb_left;
306                 else
307                         p = &(*p)->rb_right;
308         }
309         rb_link_node(&sym->rb_node, parent, p);
310         rb_insert_color(&sym->rb_node, symbols);
311 }
312 
313 static struct symbol *symbols__find(struct rb_root *symbols, u64 ip)
314 {
315         struct rb_node *n;
316 
317         if (symbols == NULL)
318                 return NULL;
319 
320         n = symbols->rb_node;
321 
322         while (n) {
323                 struct symbol *s = rb_entry(n, struct symbol, rb_node);
324 
325                 if (ip < s->start)
326                         n = n->rb_left;
327                 else if (ip > s->end)
328                         n = n->rb_right;
329                 else
330                         return s;
331         }
332 
333         return NULL;
334 }
335 
336 static struct symbol *symbols__first(struct rb_root *symbols)
337 {
338         struct rb_node *n = rb_first(symbols);
339 
340         if (n)
341                 return rb_entry(n, struct symbol, rb_node);
342 
343         return NULL;
344 }
345 
346 struct symbol_name_rb_node {
347         struct rb_node  rb_node;
348         struct symbol   sym;
349 };
350 
351 static void symbols__insert_by_name(struct rb_root *symbols, struct symbol *sym)
352 {
353         struct rb_node **p = &symbols->rb_node;
354         struct rb_node *parent = NULL;
355         struct symbol_name_rb_node *symn, *s;
356 
357         symn = container_of(sym, struct symbol_name_rb_node, sym);
358 
359         while (*p != NULL) {
360                 parent = *p;
361                 s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
362                 if (strcmp(sym->name, s->sym.name) < 0)
363                         p = &(*p)->rb_left;
364                 else
365                         p = &(*p)->rb_right;
366         }
367         rb_link_node(&symn->rb_node, parent, p);
368         rb_insert_color(&symn->rb_node, symbols);
369 }
370 
371 static void symbols__sort_by_name(struct rb_root *symbols,
372                                   struct rb_root *source)
373 {
374         struct rb_node *nd;
375 
376         for (nd = rb_first(source); nd; nd = rb_next(nd)) {
377                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
378                 symbols__insert_by_name(symbols, pos);
379         }
380 }
381 
382 static struct symbol *symbols__find_by_name(struct rb_root *symbols,
383                                             const char *name)
384 {
385         struct rb_node *n;
386 
387         if (symbols == NULL)
388                 return NULL;
389 
390         n = symbols->rb_node;
391 
392         while (n) {
393                 struct symbol_name_rb_node *s;
394                 int cmp;
395 
396                 s = rb_entry(n, struct symbol_name_rb_node, rb_node);
397                 cmp = strcmp(name, s->sym.name);
398 
399                 if (cmp < 0)
400                         n = n->rb_left;
401                 else if (cmp > 0)
402                         n = n->rb_right;
403                 else
404                         return &s->sym;
405         }
406 
407         return NULL;
408 }
409 
410 struct symbol *dso__find_symbol(struct dso *dso,
411                                 enum map_type type, u64 addr)
412 {
413         return symbols__find(&dso->symbols[type], addr);
414 }
415 
416 struct symbol *dso__first_symbol(struct dso *dso, enum map_type type)
417 {
418         return symbols__first(&dso->symbols[type]);
419 }
420 
421 struct symbol *dso__find_symbol_by_name(struct dso *dso, enum map_type type,
422                                         const char *name)
423 {
424         return symbols__find_by_name(&dso->symbol_names[type], name);
425 }
426 
427 void dso__sort_by_name(struct dso *dso, enum map_type type)
428 {
429         dso__set_sorted_by_name(dso, type);
430         return symbols__sort_by_name(&dso->symbol_names[type],
431                                      &dso->symbols[type]);
432 }
433 
434 size_t dso__fprintf_symbols_by_name(struct dso *dso,
435                                     enum map_type type, FILE *fp)
436 {
437         size_t ret = 0;
438         struct rb_node *nd;
439         struct symbol_name_rb_node *pos;
440 
441         for (nd = rb_first(&dso->symbol_names[type]); nd; nd = rb_next(nd)) {
442                 pos = rb_entry(nd, struct symbol_name_rb_node, rb_node);
443                 fprintf(fp, "%s\n", pos->sym.name);
444         }
445 
446         return ret;
447 }
448 
449 int kallsyms__parse(const char *filename, void *arg,
450                     int (*process_symbol)(void *arg, const char *name,
451                                           char type, u64 start))
452 {
453         char *line = NULL;
454         size_t n;
455         int err = -1;
456         FILE *file = fopen(filename, "r");
457 
458         if (file == NULL)
459                 goto out_failure;
460 
461         err = 0;
462 
463         while (!feof(file)) {
464                 u64 start;
465                 int line_len, len;
466                 char symbol_type;
467                 char *symbol_name;
468 
469                 line_len = getline(&line, &n, file);
470                 if (line_len < 0 || !line)
471                         break;
472 
473                 line[--line_len] = '\0'; /* \n */
474 
475                 len = hex2u64(line, &start);
476 
477                 len++;
478                 if (len + 2 >= line_len)
479                         continue;
480 
481                 symbol_type = line[len];
482                 len += 2;
483                 symbol_name = line + len;
484                 len = line_len - len;
485 
486                 if (len >= KSYM_NAME_LEN) {
487                         err = -1;
488                         break;
489                 }
490 
491                 err = process_symbol(arg, symbol_name,
492                                      symbol_type, start);
493                 if (err)
494                         break;
495         }
496 
497         free(line);
498         fclose(file);
499         return err;
500 
501 out_failure:
502         return -1;
503 }
504 
505 int modules__parse(const char *filename, void *arg,
506                    int (*process_module)(void *arg, const char *name,
507                                          u64 start))
508 {
509         char *line = NULL;
510         size_t n;
511         FILE *file;
512         int err = 0;
513 
514         file = fopen(filename, "r");
515         if (file == NULL)
516                 return -1;
517 
518         while (1) {
519                 char name[PATH_MAX];
520                 u64 start;
521                 char *sep;
522                 ssize_t line_len;
523 
524                 line_len = getline(&line, &n, file);
525                 if (line_len < 0) {
526                         if (feof(file))
527                                 break;
528                         err = -1;
529                         goto out;
530                 }
531 
532                 if (!line) {
533                         err = -1;
534                         goto out;
535                 }
536 
537                 line[--line_len] = '\0'; /* \n */
538 
539                 sep = strrchr(line, 'x');
540                 if (sep == NULL)
541                         continue;
542 
543                 hex2u64(sep + 1, &start);
544 
545                 sep = strchr(line, ' ');
546                 if (sep == NULL)
547                         continue;
548 
549                 *sep = '\0';
550 
551                 scnprintf(name, sizeof(name), "[%s]", line);
552 
553                 err = process_module(arg, name, start);
554                 if (err)
555                         break;
556         }
557 out:
558         free(line);
559         fclose(file);
560         return err;
561 }
562 
563 struct process_kallsyms_args {
564         struct map *map;
565         struct dso *dso;
566 };
567 
568 static u8 kallsyms2elf_type(char type)
569 {
570         if (type == 'W')
571                 return STB_WEAK;
572 
573         return isupper(type) ? STB_GLOBAL : STB_LOCAL;
574 }
575 
576 static int map__process_kallsym_symbol(void *arg, const char *name,
577                                        char type, u64 start)
578 {
579         struct symbol *sym;
580         struct process_kallsyms_args *a = arg;
581         struct rb_root *root = &a->dso->symbols[a->map->type];
582 
583         if (!symbol_type__is_a(type, a->map->type))
584                 return 0;
585 
586         /*
587          * module symbols are not sorted so we add all
588          * symbols, setting length to 0, and rely on
589          * symbols__fixup_end() to fix it up.
590          */
591         sym = symbol__new(start, 0, kallsyms2elf_type(type), name);
592         if (sym == NULL)
593                 return -ENOMEM;
594         /*
595          * We will pass the symbols to the filter later, in
596          * map__split_kallsyms, when we have split the maps per module
597          */
598         symbols__insert(root, sym);
599 
600         return 0;
601 }
602 
603 /*
604  * Loads the function entries in /proc/kallsyms into kernel_map->dso,
605  * so that we can in the next step set the symbol ->end address and then
606  * call kernel_maps__split_kallsyms.
607  */
608 static int dso__load_all_kallsyms(struct dso *dso, const char *filename,
609                                   struct map *map)
610 {
611         struct process_kallsyms_args args = { .map = map, .dso = dso, };
612         return kallsyms__parse(filename, &args, map__process_kallsym_symbol);
613 }
614 
615 static int dso__split_kallsyms_for_kcore(struct dso *dso, struct map *map,
616                                          symbol_filter_t filter)
617 {
618         struct map_groups *kmaps = map__kmap(map)->kmaps;
619         struct map *curr_map;
620         struct symbol *pos;
621         int count = 0, moved = 0;
622         struct rb_root *root = &dso->symbols[map->type];
623         struct rb_node *next = rb_first(root);
624 
625         while (next) {
626                 char *module;
627 
628                 pos = rb_entry(next, struct symbol, rb_node);
629                 next = rb_next(&pos->rb_node);
630 
631                 module = strchr(pos->name, '\t');
632                 if (module)
633                         *module = '\0';
634 
635                 curr_map = map_groups__find(kmaps, map->type, pos->start);
636 
637                 if (!curr_map || (filter && filter(curr_map, pos))) {
638                         rb_erase(&pos->rb_node, root);
639                         symbol__delete(pos);
640                 } else {
641                         pos->start -= curr_map->start - curr_map->pgoff;
642                         if (pos->end)
643                                 pos->end -= curr_map->start - curr_map->pgoff;
644                         if (curr_map != map) {
645                                 rb_erase(&pos->rb_node, root);
646                                 symbols__insert(
647                                         &curr_map->dso->symbols[curr_map->type],
648                                         pos);
649                                 ++moved;
650                         } else {
651                                 ++count;
652                         }
653                 }
654         }
655 
656         /* Symbols have been adjusted */
657         dso->adjust_symbols = 1;
658 
659         return count + moved;
660 }
661 
662 /*
663  * Split the symbols into maps, making sure there are no overlaps, i.e. the
664  * kernel range is broken in several maps, named [kernel].N, as we don't have
665  * the original ELF section names vmlinux have.
666  */
667 static int dso__split_kallsyms(struct dso *dso, struct map *map,
668                                symbol_filter_t filter)
669 {
670         struct map_groups *kmaps = map__kmap(map)->kmaps;
671         struct machine *machine = kmaps->machine;
672         struct map *curr_map = map;
673         struct symbol *pos;
674         int count = 0, moved = 0;       
675         struct rb_root *root = &dso->symbols[map->type];
676         struct rb_node *next = rb_first(root);
677         int kernel_range = 0;
678 
679         while (next) {
680                 char *module;
681 
682                 pos = rb_entry(next, struct symbol, rb_node);
683                 next = rb_next(&pos->rb_node);
684 
685                 module = strchr(pos->name, '\t');
686                 if (module) {
687                         if (!symbol_conf.use_modules)
688                                 goto discard_symbol;
689 
690                         *module++ = '\0';
691 
692                         if (strcmp(curr_map->dso->short_name, module)) {
693                                 if (curr_map != map &&
694                                     dso->kernel == DSO_TYPE_GUEST_KERNEL &&
695                                     machine__is_default_guest(machine)) {
696                                         /*
697                                          * We assume all symbols of a module are
698                                          * continuous in * kallsyms, so curr_map
699                                          * points to a module and all its
700                                          * symbols are in its kmap. Mark it as
701                                          * loaded.
702                                          */
703                                         dso__set_loaded(curr_map->dso,
704                                                         curr_map->type);
705                                 }
706 
707                                 curr_map = map_groups__find_by_name(kmaps,
708                                                         map->type, module);
709                                 if (curr_map == NULL) {
710                                         pr_debug("%s/proc/{kallsyms,modules} "
711                                                  "inconsistency while looking "
712                                                  "for \"%s\" module!\n",
713                                                  machine->root_dir, module);
714                                         curr_map = map;
715                                         goto discard_symbol;
716                                 }
717 
718                                 if (curr_map->dso->loaded &&
719                                     !machine__is_default_guest(machine))
720                                         goto discard_symbol;
721                         }
722                         /*
723                          * So that we look just like we get from .ko files,
724                          * i.e. not prelinked, relative to map->start.
725                          */
726                         pos->start = curr_map->map_ip(curr_map, pos->start);
727                         pos->end   = curr_map->map_ip(curr_map, pos->end);
728                 } else if (curr_map != map) {
729                         char dso_name[PATH_MAX];
730                         struct dso *ndso;
731 
732                         if (count == 0) {
733                                 curr_map = map;
734                                 goto filter_symbol;
735                         }
736 
737                         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
738                                 snprintf(dso_name, sizeof(dso_name),
739                                         "[guest.kernel].%d",
740                                         kernel_range++);
741                         else
742                                 snprintf(dso_name, sizeof(dso_name),
743                                         "[kernel].%d",
744                                         kernel_range++);
745 
746                         ndso = dso__new(dso_name);
747                         if (ndso == NULL)
748                                 return -1;
749 
750                         ndso->kernel = dso->kernel;
751 
752                         curr_map = map__new2(pos->start, ndso, map->type);
753                         if (curr_map == NULL) {
754                                 dso__delete(ndso);
755                                 return -1;
756                         }
757 
758                         curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
759                         map_groups__insert(kmaps, curr_map);
760                         ++kernel_range;
761                 }
762 filter_symbol:
763                 if (filter && filter(curr_map, pos)) {
764 discard_symbol:         rb_erase(&pos->rb_node, root);
765                         symbol__delete(pos);
766                 } else {
767                         if (curr_map != map) {
768                                 rb_erase(&pos->rb_node, root);
769                                 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
770                                 ++moved;
771                         } else
772                                 ++count;
773                 }
774         }
775 
776         if (curr_map != map &&
777             dso->kernel == DSO_TYPE_GUEST_KERNEL &&
778             machine__is_default_guest(kmaps->machine)) {
779                 dso__set_loaded(curr_map->dso, curr_map->type);
780         }
781 
782         return count + moved;
783 }
784 
785 bool symbol__restricted_filename(const char *filename,
786                                  const char *restricted_filename)
787 {
788         bool restricted = false;
789 
790         if (symbol_conf.kptr_restrict) {
791                 char *r = realpath(filename, NULL);
792 
793                 if (r != NULL) {
794                         restricted = strcmp(r, restricted_filename) == 0;
795                         free(r);
796                         return restricted;
797                 }
798         }
799 
800         return restricted;
801 }
802 
803 struct module_info {
804         struct rb_node rb_node;
805         char *name;
806         u64 start;
807 };
808 
809 static void add_module(struct module_info *mi, struct rb_root *modules)
810 {
811         struct rb_node **p = &modules->rb_node;
812         struct rb_node *parent = NULL;
813         struct module_info *m;
814 
815         while (*p != NULL) {
816                 parent = *p;
817                 m = rb_entry(parent, struct module_info, rb_node);
818                 if (strcmp(mi->name, m->name) < 0)
819                         p = &(*p)->rb_left;
820                 else
821                         p = &(*p)->rb_right;
822         }
823         rb_link_node(&mi->rb_node, parent, p);
824         rb_insert_color(&mi->rb_node, modules);
825 }
826 
827 static void delete_modules(struct rb_root *modules)
828 {
829         struct module_info *mi;
830         struct rb_node *next = rb_first(modules);
831 
832         while (next) {
833                 mi = rb_entry(next, struct module_info, rb_node);
834                 next = rb_next(&mi->rb_node);
835                 rb_erase(&mi->rb_node, modules);
836                 free(mi->name);
837                 free(mi);
838         }
839 }
840 
841 static struct module_info *find_module(const char *name,
842                                        struct rb_root *modules)
843 {
844         struct rb_node *n = modules->rb_node;
845 
846         while (n) {
847                 struct module_info *m;
848                 int cmp;
849 
850                 m = rb_entry(n, struct module_info, rb_node);
851                 cmp = strcmp(name, m->name);
852                 if (cmp < 0)
853                         n = n->rb_left;
854                 else if (cmp > 0)
855                         n = n->rb_right;
856                 else
857                         return m;
858         }
859 
860         return NULL;
861 }
862 
863 static int __read_proc_modules(void *arg, const char *name, u64 start)
864 {
865         struct rb_root *modules = arg;
866         struct module_info *mi;
867 
868         mi = zalloc(sizeof(struct module_info));
869         if (!mi)
870                 return -ENOMEM;
871 
872         mi->name = strdup(name);
873         mi->start = start;
874 
875         if (!mi->name) {
876                 free(mi);
877                 return -ENOMEM;
878         }
879 
880         add_module(mi, modules);
881 
882         return 0;
883 }
884 
885 static int read_proc_modules(const char *filename, struct rb_root *modules)
886 {
887         if (symbol__restricted_filename(filename, "/proc/modules"))
888                 return -1;
889 
890         if (modules__parse(filename, modules, __read_proc_modules)) {
891                 delete_modules(modules);
892                 return -1;
893         }
894 
895         return 0;
896 }
897 
898 int compare_proc_modules(const char *from, const char *to)
899 {
900         struct rb_root from_modules = RB_ROOT;
901         struct rb_root to_modules = RB_ROOT;
902         struct rb_node *from_node, *to_node;
903         struct module_info *from_m, *to_m;
904         int ret = -1;
905 
906         if (read_proc_modules(from, &from_modules))
907                 return -1;
908 
909         if (read_proc_modules(to, &to_modules))
910                 goto out_delete_from;
911 
912         from_node = rb_first(&from_modules);
913         to_node = rb_first(&to_modules);
914         while (from_node) {
915                 if (!to_node)
916                         break;
917 
918                 from_m = rb_entry(from_node, struct module_info, rb_node);
919                 to_m = rb_entry(to_node, struct module_info, rb_node);
920 
921                 if (from_m->start != to_m->start ||
922                     strcmp(from_m->name, to_m->name))
923                         break;
924 
925                 from_node = rb_next(from_node);
926                 to_node = rb_next(to_node);
927         }
928 
929         if (!from_node && !to_node)
930                 ret = 0;
931 
932         delete_modules(&to_modules);
933 out_delete_from:
934         delete_modules(&from_modules);
935 
936         return ret;
937 }
938 
939 static int do_validate_kcore_modules(const char *filename, struct map *map,
940                                   struct map_groups *kmaps)
941 {
942         struct rb_root modules = RB_ROOT;
943         struct map *old_map;
944         int err;
945 
946         err = read_proc_modules(filename, &modules);
947         if (err)
948                 return err;
949 
950         old_map = map_groups__first(kmaps, map->type);
951         while (old_map) {
952                 struct map *next = map_groups__next(old_map);
953                 struct module_info *mi;
954 
955                 if (old_map == map || old_map->start == map->start) {
956                         /* The kernel map */
957                         old_map = next;
958                         continue;
959                 }
960 
961                 /* Module must be in memory at the same address */
962                 mi = find_module(old_map->dso->short_name, &modules);
963                 if (!mi || mi->start != old_map->start) {
964                         err = -EINVAL;
965                         goto out;
966                 }
967 
968                 old_map = next;
969         }
970 out:
971         delete_modules(&modules);
972         return err;
973 }
974 
975 /*
976  * If kallsyms is referenced by name then we look for filename in the same
977  * directory.
978  */
979 static bool filename_from_kallsyms_filename(char *filename,
980                                             const char *base_name,
981                                             const char *kallsyms_filename)
982 {
983         char *name;
984 
985         strcpy(filename, kallsyms_filename);
986         name = strrchr(filename, '/');
987         if (!name)
988                 return false;
989 
990         name += 1;
991 
992         if (!strcmp(name, "kallsyms")) {
993                 strcpy(name, base_name);
994                 return true;
995         }
996 
997         return false;
998 }
999 
1000 static int validate_kcore_modules(const char *kallsyms_filename,
1001                                   struct map *map)
1002 {
1003         struct map_groups *kmaps = map__kmap(map)->kmaps;
1004         char modules_filename[PATH_MAX];
1005 
1006         if (!filename_from_kallsyms_filename(modules_filename, "modules",
1007                                              kallsyms_filename))
1008                 return -EINVAL;
1009 
1010         if (do_validate_kcore_modules(modules_filename, map, kmaps))
1011                 return -EINVAL;
1012 
1013         return 0;
1014 }
1015 
1016 struct kcore_mapfn_data {
1017         struct dso *dso;
1018         enum map_type type;
1019         struct list_head maps;
1020 };
1021 
1022 static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
1023 {
1024         struct kcore_mapfn_data *md = data;
1025         struct map *map;
1026 
1027         map = map__new2(start, md->dso, md->type);
1028         if (map == NULL)
1029                 return -ENOMEM;
1030 
1031         map->end = map->start + len;
1032         map->pgoff = pgoff;
1033 
1034         list_add(&map->node, &md->maps);
1035 
1036         return 0;
1037 }
1038 
1039 static int dso__load_kcore(struct dso *dso, struct map *map,
1040                            const char *kallsyms_filename)
1041 {
1042         struct map_groups *kmaps = map__kmap(map)->kmaps;
1043         struct machine *machine = kmaps->machine;
1044         struct kcore_mapfn_data md;
1045         struct map *old_map, *new_map, *replacement_map = NULL;
1046         bool is_64_bit;
1047         int err, fd;
1048         char kcore_filename[PATH_MAX];
1049         struct symbol *sym;
1050 
1051         /* This function requires that the map is the kernel map */
1052         if (map != machine->vmlinux_maps[map->type])
1053                 return -EINVAL;
1054 
1055         if (!filename_from_kallsyms_filename(kcore_filename, "kcore",
1056                                              kallsyms_filename))
1057                 return -EINVAL;
1058 
1059         /* All modules must be present at their original addresses */
1060         if (validate_kcore_modules(kallsyms_filename, map))
1061                 return -EINVAL;
1062 
1063         md.dso = dso;
1064         md.type = map->type;
1065         INIT_LIST_HEAD(&md.maps);
1066 
1067         fd = open(kcore_filename, O_RDONLY);
1068         if (fd < 0)
1069                 return -EINVAL;
1070 
1071         /* Read new maps into temporary lists */
1072         err = file__read_maps(fd, md.type == MAP__FUNCTION, kcore_mapfn, &md,
1073                               &is_64_bit);
1074         if (err)
1075                 goto out_err;
1076 
1077         if (list_empty(&md.maps)) {
1078                 err = -EINVAL;
1079                 goto out_err;
1080         }
1081 
1082         /* Remove old maps */
1083         old_map = map_groups__first(kmaps, map->type);
1084         while (old_map) {
1085                 struct map *next = map_groups__next(old_map);
1086 
1087                 if (old_map != map)
1088                         map_groups__remove(kmaps, old_map);
1089                 old_map = next;
1090         }
1091 
1092         /* Find the kernel map using the first symbol */
1093         sym = dso__first_symbol(dso, map->type);
1094         list_for_each_entry(new_map, &md.maps, node) {
1095                 if (sym && sym->start >= new_map->start &&
1096                     sym->start < new_map->end) {
1097                         replacement_map = new_map;
1098                         break;
1099                 }
1100         }
1101 
1102         if (!replacement_map)
1103                 replacement_map = list_entry(md.maps.next, struct map, node);
1104 
1105         /* Add new maps */
1106         while (!list_empty(&md.maps)) {
1107                 new_map = list_entry(md.maps.next, struct map, node);
1108                 list_del(&new_map->node);
1109                 if (new_map == replacement_map) {
1110                         map->start      = new_map->start;
1111                         map->end        = new_map->end;
1112                         map->pgoff      = new_map->pgoff;
1113                         map->map_ip     = new_map->map_ip;
1114                         map->unmap_ip   = new_map->unmap_ip;
1115                         map__delete(new_map);
1116                         /* Ensure maps are correctly ordered */
1117                         map_groups__remove(kmaps, map);
1118                         map_groups__insert(kmaps, map);
1119                 } else {
1120                         map_groups__insert(kmaps, new_map);
1121                 }
1122         }
1123 
1124         /*
1125          * Set the data type and long name so that kcore can be read via
1126          * dso__data_read_addr().
1127          */
1128         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1129                 dso->data_type = DSO_BINARY_TYPE__GUEST_KCORE;
1130         else
1131                 dso->data_type = DSO_BINARY_TYPE__KCORE;
1132         dso__set_long_name(dso, strdup(kcore_filename));
1133 
1134         close(fd);
1135 
1136         if (map->type == MAP__FUNCTION)
1137                 pr_debug("Using %s for kernel object code\n", kcore_filename);
1138         else
1139                 pr_debug("Using %s for kernel data\n", kcore_filename);
1140 
1141         return 0;
1142 
1143 out_err:
1144         while (!list_empty(&md.maps)) {
1145                 map = list_entry(md.maps.next, struct map, node);
1146                 list_del(&map->node);
1147                 map__delete(map);
1148         }
1149         close(fd);
1150         return -EINVAL;
1151 }
1152 
1153 int dso__load_kallsyms(struct dso *dso, const char *filename,
1154                        struct map *map, symbol_filter_t filter)
1155 {
1156         if (symbol__restricted_filename(filename, "/proc/kallsyms"))
1157                 return -1;
1158 
1159         if (dso__load_all_kallsyms(dso, filename, map) < 0)
1160                 return -1;
1161 
1162         symbols__fixup_duplicate(&dso->symbols[map->type]);
1163         symbols__fixup_end(&dso->symbols[map->type]);
1164 
1165         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1166                 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1167         else
1168                 dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS;
1169 
1170         if (!dso__load_kcore(dso, map, filename))
1171                 return dso__split_kallsyms_for_kcore(dso, map, filter);
1172         else
1173                 return dso__split_kallsyms(dso, map, filter);
1174 }
1175 
1176 static int dso__load_perf_map(struct dso *dso, struct map *map,
1177                               symbol_filter_t filter)
1178 {
1179         char *line = NULL;
1180         size_t n;
1181         FILE *file;
1182         int nr_syms = 0;
1183 
1184         file = fopen(dso->long_name, "r");
1185         if (file == NULL)
1186                 goto out_failure;
1187 
1188         while (!feof(file)) {
1189                 u64 start, size;
1190                 struct symbol *sym;
1191                 int line_len, len;
1192 
1193                 line_len = getline(&line, &n, file);
1194                 if (line_len < 0)
1195                         break;
1196 
1197                 if (!line)
1198                         goto out_failure;
1199 
1200                 line[--line_len] = '\0'; /* \n */
1201 
1202                 len = hex2u64(line, &start);
1203 
1204                 len++;
1205                 if (len + 2 >= line_len)
1206                         continue;
1207 
1208                 len += hex2u64(line + len, &size);
1209 
1210                 len++;
1211                 if (len + 2 >= line_len)
1212                         continue;
1213 
1214                 sym = symbol__new(start, size, STB_GLOBAL, line + len);
1215 
1216                 if (sym == NULL)
1217                         goto out_delete_line;
1218 
1219                 if (filter && filter(map, sym))
1220                         symbol__delete(sym);
1221                 else {
1222                         symbols__insert(&dso->symbols[map->type], sym);
1223                         nr_syms++;
1224                 }
1225         }
1226 
1227         free(line);
1228         fclose(file);
1229 
1230         return nr_syms;
1231 
1232 out_delete_line:
1233         free(line);
1234 out_failure:
1235         return -1;
1236 }
1237 
1238 int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
1239 {
1240         char *name;
1241         int ret = -1;
1242         u_int i;
1243         struct machine *machine;
1244         char *root_dir = (char *) "";
1245         int ss_pos = 0;
1246         struct symsrc ss_[2];
1247         struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
1248 
1249         dso__set_loaded(dso, map->type);
1250 
1251         if (dso->kernel == DSO_TYPE_KERNEL)
1252                 return dso__load_kernel_sym(dso, map, filter);
1253         else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1254                 return dso__load_guest_kernel_sym(dso, map, filter);
1255 
1256         if (map->groups && map->groups->machine)
1257                 machine = map->groups->machine;
1258         else
1259                 machine = NULL;
1260 
1261         dso->adjust_symbols = 0;
1262 
1263         if (strncmp(dso->name, "/tmp/perf-", 10) == 0) {
1264                 struct stat st;
1265 
1266                 if (lstat(dso->name, &st) < 0)
1267                         return -1;
1268 
1269                 if (st.st_uid && (st.st_uid != geteuid())) {
1270                         pr_warning("File %s not owned by current user or root, "
1271                                 "ignoring it.\n", dso->name);
1272                         return -1;
1273                 }
1274 
1275                 ret = dso__load_perf_map(dso, map, filter);
1276                 dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
1277                                              DSO_BINARY_TYPE__NOT_FOUND;
1278                 return ret;
1279         }
1280 
1281         if (machine)
1282                 root_dir = machine->root_dir;
1283 
1284         name = malloc(PATH_MAX);
1285         if (!name)
1286                 return -1;
1287 
1288         /* Iterate over candidate debug images.
1289          * Keep track of "interesting" ones (those which have a symtab, dynsym,
1290          * and/or opd section) for processing.
1291          */
1292         for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
1293                 struct symsrc *ss = &ss_[ss_pos];
1294                 bool next_slot = false;
1295 
1296                 enum dso_binary_type symtab_type = binary_type_symtab[i];
1297 
1298                 if (dso__binary_type_file(dso, symtab_type,
1299                                           root_dir, name, PATH_MAX))
1300                         continue;
1301 
1302                 /* Name is now the name of the next image to try */
1303                 if (symsrc__init(ss, dso, name, symtab_type) < 0)
1304                         continue;
1305 
1306                 if (!syms_ss && symsrc__has_symtab(ss)) {
1307                         syms_ss = ss;
1308                         next_slot = true;
1309                 }
1310 
1311                 if (!runtime_ss && symsrc__possibly_runtime(ss)) {
1312                         runtime_ss = ss;
1313                         next_slot = true;
1314                 }
1315 
1316                 if (next_slot) {
1317                         ss_pos++;
1318 
1319                         if (syms_ss && runtime_ss)
1320                                 break;
1321                 }
1322 
1323         }
1324 
1325         if (!runtime_ss && !syms_ss)
1326                 goto out_free;
1327 
1328         if (runtime_ss && !syms_ss) {
1329                 syms_ss = runtime_ss;
1330         }
1331 
1332         /* We'll have to hope for the best */
1333         if (!runtime_ss && syms_ss)
1334                 runtime_ss = syms_ss;
1335 
1336         if (syms_ss) {
1337                 int km;
1338 
1339                 km = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
1340                      dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE;
1341                 ret = dso__load_sym(dso, map, syms_ss, runtime_ss, filter, km);
1342         } else {
1343                 ret = -1;
1344         }
1345 
1346         if (ret > 0) {
1347                 int nr_plt;
1348 
1349                 nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss, map, filter);
1350                 if (nr_plt > 0)
1351                         ret += nr_plt;
1352         }
1353 
1354         for (; ss_pos > 0; ss_pos--)
1355                 symsrc__destroy(&ss_[ss_pos - 1]);
1356 out_free:
1357         free(name);
1358         if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1359                 return 0;
1360         return ret;
1361 }
1362 
1363 struct map *map_groups__find_by_name(struct map_groups *mg,
1364                                      enum map_type type, const char *name)
1365 {
1366         struct rb_node *nd;
1367 
1368         for (nd = rb_first(&mg->maps[type]); nd; nd = rb_next(nd)) {
1369                 struct map *map = rb_entry(nd, struct map, rb_node);
1370 
1371                 if (map->dso && strcmp(map->dso->short_name, name) == 0)
1372                         return map;
1373         }
1374 
1375         return NULL;
1376 }
1377 
1378 int dso__load_vmlinux(struct dso *dso, struct map *map,
1379                       const char *vmlinux, symbol_filter_t filter)
1380 {
1381         int err = -1;
1382         struct symsrc ss;
1383         char symfs_vmlinux[PATH_MAX];
1384         enum dso_binary_type symtab_type;
1385 
1386         if (vmlinux[0] == '/')
1387                 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
1388         else
1389                 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s%s",
1390                          symbol_conf.symfs, vmlinux);
1391 
1392         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1393                 symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1394         else
1395                 symtab_type = DSO_BINARY_TYPE__VMLINUX;
1396 
1397         if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type))
1398                 return -1;
1399 
1400         err = dso__load_sym(dso, map, &ss, &ss, filter, 0);
1401         symsrc__destroy(&ss);
1402 
1403         if (err > 0) {
1404                 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1405                         dso->data_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1406                 else
1407                         dso->data_type = DSO_BINARY_TYPE__VMLINUX;
1408                 dso__set_long_name(dso, (char *)vmlinux);
1409                 dso__set_loaded(dso, map->type);
1410                 pr_debug("Using %s for symbols\n", symfs_vmlinux);
1411         }
1412 
1413         return err;
1414 }
1415 
1416 int dso__load_vmlinux_path(struct dso *dso, struct map *map,
1417                            symbol_filter_t filter)
1418 {
1419         int i, err = 0;
1420         char *filename;
1421 
1422         pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1423                  vmlinux_path__nr_entries + 1);
1424 
1425         filename = dso__build_id_filename(dso, NULL, 0);
1426         if (filename != NULL) {
1427                 err = dso__load_vmlinux(dso, map, filename, filter);
1428                 if (err > 0) {
1429                         dso->lname_alloc = 1;
1430                         goto out;
1431                 }
1432                 free(filename);
1433         }
1434 
1435         for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1436                 err = dso__load_vmlinux(dso, map, vmlinux_path[i], filter);
1437                 if (err > 0) {
1438                         dso__set_long_name(dso, strdup(vmlinux_path[i]));
1439                         dso->lname_alloc = 1;
1440                         break;
1441                 }
1442         }
1443 out:
1444         return err;
1445 }
1446 
1447 static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
1448 {
1449         char kallsyms_filename[PATH_MAX];
1450         struct dirent *dent;
1451         int ret = -1;
1452         DIR *d;
1453 
1454         d = opendir(dir);
1455         if (!d)
1456                 return -1;
1457 
1458         while (1) {
1459                 dent = readdir(d);
1460                 if (!dent)
1461                         break;
1462                 if (dent->d_type != DT_DIR)
1463                         continue;
1464                 scnprintf(kallsyms_filename, sizeof(kallsyms_filename),
1465                           "%s/%s/kallsyms", dir, dent->d_name);
1466                 if (!validate_kcore_modules(kallsyms_filename, map)) {
1467                         strlcpy(dir, kallsyms_filename, dir_sz);
1468                         ret = 0;
1469                         break;
1470                 }
1471         }
1472 
1473         closedir(d);
1474 
1475         return ret;
1476 }
1477 
1478 static char *dso__find_kallsyms(struct dso *dso, struct map *map)
1479 {
1480         u8 host_build_id[BUILD_ID_SIZE];
1481         char sbuild_id[BUILD_ID_SIZE * 2 + 1];
1482         bool is_host = false;
1483         char path[PATH_MAX];
1484 
1485         if (!dso->has_build_id) {
1486                 /*
1487                  * Last resort, if we don't have a build-id and couldn't find
1488                  * any vmlinux file, try the running kernel kallsyms table.
1489                  */
1490                 goto proc_kallsyms;
1491         }
1492 
1493         if (sysfs__read_build_id("/sys/kernel/notes", host_build_id,
1494                                  sizeof(host_build_id)) == 0)
1495                 is_host = dso__build_id_equal(dso, host_build_id);
1496 
1497         build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
1498 
1499         /* Use /proc/kallsyms if possible */
1500         if (is_host) {
1501                 DIR *d;
1502                 int fd;
1503 
1504                 /* If no cached kcore go with /proc/kallsyms */
1505                 scnprintf(path, sizeof(path), "%s/[kernel.kcore]/%s",
1506                           buildid_dir, sbuild_id);
1507                 d = opendir(path);
1508                 if (!d)
1509                         goto proc_kallsyms;
1510                 closedir(d);
1511 
1512                 /*
1513                  * Do not check the build-id cache, until we know we cannot use
1514                  * /proc/kcore.
1515                  */
1516                 fd = open("/proc/kcore", O_RDONLY);
1517                 if (fd != -1) {
1518                         close(fd);
1519                         /* If module maps match go with /proc/kallsyms */
1520                         if (!validate_kcore_modules("/proc/kallsyms", map))
1521                                 goto proc_kallsyms;
1522                 }
1523 
1524                 /* Find kallsyms in build-id cache with kcore */
1525                 if (!find_matching_kcore(map, path, sizeof(path)))
1526                         return strdup(path);
1527 
1528                 goto proc_kallsyms;
1529         }
1530 
1531         scnprintf(path, sizeof(path), "%s/[kernel.kallsyms]/%s",
1532                   buildid_dir, sbuild_id);
1533 
1534         if (access(path, F_OK)) {
1535                 pr_err("No kallsyms or vmlinux with build-id %s was found\n",
1536                        sbuild_id);
1537                 return NULL;
1538         }
1539 
1540         return strdup(path);
1541 
1542 proc_kallsyms:
1543         return strdup("/proc/kallsyms");
1544 }
1545 
1546 static int dso__load_kernel_sym(struct dso *dso, struct map *map,
1547                                 symbol_filter_t filter)
1548 {
1549         int err;
1550         const char *kallsyms_filename = NULL;
1551         char *kallsyms_allocated_filename = NULL;
1552         /*
1553          * Step 1: if the user specified a kallsyms or vmlinux filename, use
1554          * it and only it, reporting errors to the user if it cannot be used.
1555          *
1556          * For instance, try to analyse an ARM perf.data file _without_ a
1557          * build-id, or if the user specifies the wrong path to the right
1558          * vmlinux file, obviously we can't fallback to another vmlinux (a
1559          * x86_86 one, on the machine where analysis is being performed, say),
1560          * or worse, /proc/kallsyms.
1561          *
1562          * If the specified file _has_ a build-id and there is a build-id
1563          * section in the perf.data file, we will still do the expected
1564          * validation in dso__load_vmlinux and will bail out if they don't
1565          * match.
1566          */
1567         if (symbol_conf.kallsyms_name != NULL) {
1568                 kallsyms_filename = symbol_conf.kallsyms_name;
1569                 goto do_kallsyms;
1570         }
1571 
1572         if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) {
1573                 err = dso__load_vmlinux(dso, map,
1574                                         symbol_conf.vmlinux_name, filter);
1575                 if (err > 0) {
1576                         dso__set_long_name(dso,
1577                                            strdup(symbol_conf.vmlinux_name));
1578                         dso->lname_alloc = 1;
1579                         return err;
1580                 }
1581                 return err;
1582         }
1583 
1584         if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) {
1585                 err = dso__load_vmlinux_path(dso, map, filter);
1586                 if (err > 0)
1587                         return err;
1588         }
1589 
1590         /* do not try local files if a symfs was given */
1591         if (symbol_conf.symfs[0] != 0)
1592                 return -1;
1593 
1594         kallsyms_allocated_filename = dso__find_kallsyms(dso, map);
1595         if (!kallsyms_allocated_filename)
1596                 return -1;
1597 
1598         kallsyms_filename = kallsyms_allocated_filename;
1599 
1600 do_kallsyms:
1601         err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
1602         if (err > 0)
1603                 pr_debug("Using %s for symbols\n", kallsyms_filename);
1604         free(kallsyms_allocated_filename);
1605 
1606         if (err > 0 && !dso__is_kcore(dso)) {
1607                 dso__set_long_name(dso, strdup("[kernel.kallsyms]"));
1608                 map__fixup_start(map);
1609                 map__fixup_end(map);
1610         }
1611 
1612         return err;
1613 }
1614 
1615 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
1616                                       symbol_filter_t filter)
1617 {
1618         int err;
1619         const char *kallsyms_filename = NULL;
1620         struct machine *machine;
1621         char path[PATH_MAX];
1622 
1623         if (!map->groups) {
1624                 pr_debug("Guest kernel map hasn't the point to groups\n");
1625                 return -1;
1626         }
1627         machine = map->groups->machine;
1628 
1629         if (machine__is_default_guest(machine)) {
1630                 /*
1631                  * if the user specified a vmlinux filename, use it and only
1632                  * it, reporting errors to the user if it cannot be used.
1633                  * Or use file guest_kallsyms inputted by user on commandline
1634                  */
1635                 if (symbol_conf.default_guest_vmlinux_name != NULL) {
1636                         err = dso__load_vmlinux(dso, map,
1637                                 symbol_conf.default_guest_vmlinux_name, filter);
1638                         return err;
1639                 }
1640 
1641                 kallsyms_filename = symbol_conf.default_guest_kallsyms;
1642                 if (!kallsyms_filename)
1643                         return -1;
1644         } else {
1645                 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
1646                 kallsyms_filename = path;
1647         }
1648 
1649         err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
1650         if (err > 0)
1651                 pr_debug("Using %s for symbols\n", kallsyms_filename);
1652         if (err > 0 && !dso__is_kcore(dso)) {
1653                 machine__mmap_name(machine, path, sizeof(path));
1654                 dso__set_long_name(dso, strdup(path));
1655                 map__fixup_start(map);
1656                 map__fixup_end(map);
1657         }
1658 
1659         return err;
1660 }
1661 
1662 static void vmlinux_path__exit(void)
1663 {
1664         while (--vmlinux_path__nr_entries >= 0) {
1665                 free(vmlinux_path[vmlinux_path__nr_entries]);
1666                 vmlinux_path[vmlinux_path__nr_entries] = NULL;
1667         }
1668 
1669         free(vmlinux_path);
1670         vmlinux_path = NULL;
1671 }
1672 
1673 static int vmlinux_path__init(void)
1674 {
1675         struct utsname uts;
1676         char bf[PATH_MAX];
1677 
1678         vmlinux_path = malloc(sizeof(char *) * 5);
1679         if (vmlinux_path == NULL)
1680                 return -1;
1681 
1682         vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
1683         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1684                 goto out_fail;
1685         ++vmlinux_path__nr_entries;
1686         vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
1687         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1688                 goto out_fail;
1689         ++vmlinux_path__nr_entries;
1690 
1691         /* only try running kernel version if no symfs was given */
1692         if (symbol_conf.symfs[0] != 0)
1693                 return 0;
1694 
1695         if (uname(&uts) < 0)
1696                 return -1;
1697 
1698         snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
1699         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1700         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1701                 goto out_fail;
1702         ++vmlinux_path__nr_entries;
1703         snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release);
1704         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1705         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1706                 goto out_fail;
1707         ++vmlinux_path__nr_entries;
1708         snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
1709                  uts.release);
1710         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1711         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1712                 goto out_fail;
1713         ++vmlinux_path__nr_entries;
1714 
1715         return 0;
1716 
1717 out_fail:
1718         vmlinux_path__exit();
1719         return -1;
1720 }
1721 
1722 static int setup_list(struct strlist **list, const char *list_str,
1723                       const char *list_name)
1724 {
1725         if (list_str == NULL)
1726                 return 0;
1727 
1728         *list = strlist__new(true, list_str);
1729         if (!*list) {
1730                 pr_err("problems parsing %s list\n", list_name);
1731                 return -1;
1732         }
1733         return 0;
1734 }
1735 
1736 static bool symbol__read_kptr_restrict(void)
1737 {
1738         bool value = false;
1739 
1740         if (geteuid() != 0) {
1741                 FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
1742                 if (fp != NULL) {
1743                         char line[8];
1744 
1745                         if (fgets(line, sizeof(line), fp) != NULL)
1746                                 value = atoi(line) != 0;
1747 
1748                         fclose(fp);
1749                 }
1750         }
1751 
1752         return value;
1753 }
1754 
1755 int symbol__init(void)
1756 {
1757         const char *symfs;
1758 
1759         if (symbol_conf.initialized)
1760                 return 0;
1761 
1762         symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64));
1763 
1764         symbol__elf_init();
1765 
1766         if (symbol_conf.sort_by_name)
1767                 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
1768                                           sizeof(struct symbol));
1769 
1770         if (symbol_conf.try_vmlinux_path && vmlinux_path__init() < 0)
1771                 return -1;
1772 
1773         if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
1774                 pr_err("'.' is the only non valid --field-separator argument\n");
1775                 return -1;
1776         }
1777 
1778         if (setup_list(&symbol_conf.dso_list,
1779                        symbol_conf.dso_list_str, "dso") < 0)
1780                 return -1;
1781 
1782         if (setup_list(&symbol_conf.comm_list,
1783                        symbol_conf.comm_list_str, "comm") < 0)
1784                 goto out_free_dso_list;
1785 
1786         if (setup_list(&symbol_conf.sym_list,
1787                        symbol_conf.sym_list_str, "symbol") < 0)
1788                 goto out_free_comm_list;
1789 
1790         /*
1791          * A path to symbols of "/" is identical to ""
1792          * reset here for simplicity.
1793          */
1794         symfs = realpath(symbol_conf.symfs, NULL);
1795         if (symfs == NULL)
1796                 symfs = symbol_conf.symfs;
1797         if (strcmp(symfs, "/") == 0)
1798                 symbol_conf.symfs = "";
1799         if (symfs != symbol_conf.symfs)
1800                 free((void *)symfs);
1801 
1802         symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
1803 
1804         symbol_conf.initialized = true;
1805         return 0;
1806 
1807 out_free_comm_list:
1808         strlist__delete(symbol_conf.comm_list);
1809 out_free_dso_list:
1810         strlist__delete(symbol_conf.dso_list);
1811         return -1;
1812 }
1813 
1814 void symbol__exit(void)
1815 {
1816         if (!symbol_conf.initialized)
1817                 return;
1818         strlist__delete(symbol_conf.sym_list);
1819         strlist__delete(symbol_conf.dso_list);
1820         strlist__delete(symbol_conf.comm_list);
1821         vmlinux_path__exit();
1822         symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
1823         symbol_conf.initialized = false;
1824 }
1825 

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