perf symbols: /proc/kallsyms does not sort module symbols
[linux-2.6.git] / tools / perf / util / symbol.c
1 #define _GNU_SOURCE
2 #include <ctype.h>
3 #include <dirent.h>
4 #include <errno.h>
5 #include <libgen.h>
6 #include <stdlib.h>
7 #include <stdio.h>
8 #include <string.h>
9 #include <sys/types.h>
10 #include <sys/stat.h>
11 #include <sys/param.h>
12 #include <fcntl.h>
13 #include <unistd.h>
14 #include <inttypes.h>
15 #include "build-id.h"
16 #include "debug.h"
17 #include "symbol.h"
18 #include "strlist.h"
19
20 #include <libelf.h>
21 #include <gelf.h>
22 #include <elf.h>
23 #include <limits.h>
24 #include <sys/utsname.h>
25
26 #ifndef KSYM_NAME_LEN
27 #define KSYM_NAME_LEN 128
28 #endif
29
30 #ifndef NT_GNU_BUILD_ID
31 #define NT_GNU_BUILD_ID 3
32 #endif
33
34 static bool dso__build_id_equal(const struct dso *dso, u8 *build_id);
35 static int elf_read_build_id(Elf *elf, void *bf, size_t size);
36 static void dsos__add(struct list_head *head, struct dso *dso);
37 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type);
38 static int dso__load_kernel_sym(struct dso *dso, struct map *map,
39                                 symbol_filter_t filter);
40 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
41                         symbol_filter_t filter);
42 static int vmlinux_path__nr_entries;
43 static char **vmlinux_path;
44
45 struct symbol_conf symbol_conf = {
46         .exclude_other    = true,
47         .use_modules      = true,
48         .try_vmlinux_path = 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         switch (map_type) {
78         case MAP__FUNCTION:
79                 return symbol_type == 'T' || symbol_type == 'W';
80         case MAP__VARIABLE:
81                 return symbol_type == 'D' || symbol_type == 'd';
82         default:
83                 return false;
84         }
85 }
86
87 static void symbols__fixup_end(struct rb_root *symbols)
88 {
89         struct rb_node *nd, *prevnd = rb_first(symbols);
90         struct symbol *curr, *prev;
91
92         if (prevnd == NULL)
93                 return;
94
95         curr = rb_entry(prevnd, struct symbol, rb_node);
96
97         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
98                 prev = curr;
99                 curr = rb_entry(nd, struct symbol, rb_node);
100
101                 if (prev->end == prev->start && prev->end != curr->start)
102                         prev->end = curr->start - 1;
103         }
104
105         /* Last entry */
106         if (curr->end == curr->start)
107                 curr->end = roundup(curr->start, 4096);
108 }
109
110 static void __map_groups__fixup_end(struct map_groups *mg, enum map_type type)
111 {
112         struct map *prev, *curr;
113         struct rb_node *nd, *prevnd = rb_first(&mg->maps[type]);
114
115         if (prevnd == NULL)
116                 return;
117
118         curr = rb_entry(prevnd, struct map, rb_node);
119
120         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
121                 prev = curr;
122                 curr = rb_entry(nd, struct map, rb_node);
123                 prev->end = curr->start - 1;
124         }
125
126         /*
127          * We still haven't the actual symbols, so guess the
128          * last map final address.
129          */
130         curr->end = ~0ULL;
131 }
132
133 static void map_groups__fixup_end(struct map_groups *mg)
134 {
135         int i;
136         for (i = 0; i < MAP__NR_TYPES; ++i)
137                 __map_groups__fixup_end(mg, i);
138 }
139
140 static struct symbol *symbol__new(u64 start, u64 len, u8 binding,
141                                   const char *name)
142 {
143         size_t namelen = strlen(name) + 1;
144         struct symbol *sym = calloc(1, (symbol_conf.priv_size +
145                                         sizeof(*sym) + namelen));
146         if (sym == NULL)
147                 return NULL;
148
149         if (symbol_conf.priv_size)
150                 sym = ((void *)sym) + symbol_conf.priv_size;
151
152         sym->start   = start;
153         sym->end     = len ? start + len - 1 : start;
154         sym->binding = binding;
155         sym->namelen = namelen - 1;
156
157         pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n",
158                   __func__, name, start, sym->end);
159         memcpy(sym->name, name, namelen);
160
161         return sym;
162 }
163
164 void symbol__delete(struct symbol *sym)
165 {
166         free(((void *)sym) - symbol_conf.priv_size);
167 }
168
169 static size_t symbol__fprintf(struct symbol *sym, FILE *fp)
170 {
171         return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %c %s\n",
172                        sym->start, sym->end,
173                        sym->binding == STB_GLOBAL ? 'g' :
174                        sym->binding == STB_LOCAL  ? 'l' : 'w',
175                        sym->name);
176 }
177
178 void dso__set_long_name(struct dso *dso, char *name)
179 {
180         if (name == NULL)
181                 return;
182         dso->long_name = name;
183         dso->long_name_len = strlen(name);
184 }
185
186 static void dso__set_short_name(struct dso *dso, const char *name)
187 {
188         if (name == NULL)
189                 return;
190         dso->short_name = name;
191         dso->short_name_len = strlen(name);
192 }
193
194 static void dso__set_basename(struct dso *dso)
195 {
196         dso__set_short_name(dso, basename(dso->long_name));
197 }
198
199 struct dso *dso__new(const char *name)
200 {
201         struct dso *dso = calloc(1, sizeof(*dso) + strlen(name) + 1);
202
203         if (dso != NULL) {
204                 int i;
205                 strcpy(dso->name, name);
206                 dso__set_long_name(dso, dso->name);
207                 dso__set_short_name(dso, dso->name);
208                 for (i = 0; i < MAP__NR_TYPES; ++i)
209                         dso->symbols[i] = dso->symbol_names[i] = RB_ROOT;
210                 dso->symtab_type = SYMTAB__NOT_FOUND;
211                 dso->loaded = 0;
212                 dso->sorted_by_name = 0;
213                 dso->has_build_id = 0;
214                 dso->kernel = DSO_TYPE_USER;
215                 INIT_LIST_HEAD(&dso->node);
216         }
217
218         return dso;
219 }
220
221 static void symbols__delete(struct rb_root *symbols)
222 {
223         struct symbol *pos;
224         struct rb_node *next = rb_first(symbols);
225
226         while (next) {
227                 pos = rb_entry(next, struct symbol, rb_node);
228                 next = rb_next(&pos->rb_node);
229                 rb_erase(&pos->rb_node, symbols);
230                 symbol__delete(pos);
231         }
232 }
233
234 void dso__delete(struct dso *dso)
235 {
236         int i;
237         for (i = 0; i < MAP__NR_TYPES; ++i)
238                 symbols__delete(&dso->symbols[i]);
239         if (dso->sname_alloc)
240                 free((char *)dso->short_name);
241         if (dso->lname_alloc)
242                 free(dso->long_name);
243         free(dso);
244 }
245
246 void dso__set_build_id(struct dso *dso, void *build_id)
247 {
248         memcpy(dso->build_id, build_id, sizeof(dso->build_id));
249         dso->has_build_id = 1;
250 }
251
252 static void symbols__insert(struct rb_root *symbols, struct symbol *sym)
253 {
254         struct rb_node **p = &symbols->rb_node;
255         struct rb_node *parent = NULL;
256         const u64 ip = sym->start;
257         struct symbol *s;
258
259         while (*p != NULL) {
260                 parent = *p;
261                 s = rb_entry(parent, struct symbol, rb_node);
262                 if (ip < s->start)
263                         p = &(*p)->rb_left;
264                 else
265                         p = &(*p)->rb_right;
266         }
267         rb_link_node(&sym->rb_node, parent, p);
268         rb_insert_color(&sym->rb_node, symbols);
269 }
270
271 static struct symbol *symbols__find(struct rb_root *symbols, u64 ip)
272 {
273         struct rb_node *n;
274
275         if (symbols == NULL)
276                 return NULL;
277
278         n = symbols->rb_node;
279
280         while (n) {
281                 struct symbol *s = rb_entry(n, struct symbol, rb_node);
282
283                 if (ip < s->start)
284                         n = n->rb_left;
285                 else if (ip > s->end)
286                         n = n->rb_right;
287                 else
288                         return s;
289         }
290
291         return NULL;
292 }
293
294 struct symbol_name_rb_node {
295         struct rb_node  rb_node;
296         struct symbol   sym;
297 };
298
299 static void symbols__insert_by_name(struct rb_root *symbols, struct symbol *sym)
300 {
301         struct rb_node **p = &symbols->rb_node;
302         struct rb_node *parent = NULL;
303         struct symbol_name_rb_node *symn, *s;
304
305         symn = container_of(sym, struct symbol_name_rb_node, sym);
306
307         while (*p != NULL) {
308                 parent = *p;
309                 s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
310                 if (strcmp(sym->name, s->sym.name) < 0)
311                         p = &(*p)->rb_left;
312                 else
313                         p = &(*p)->rb_right;
314         }
315         rb_link_node(&symn->rb_node, parent, p);
316         rb_insert_color(&symn->rb_node, symbols);
317 }
318
319 static void symbols__sort_by_name(struct rb_root *symbols,
320                                   struct rb_root *source)
321 {
322         struct rb_node *nd;
323
324         for (nd = rb_first(source); nd; nd = rb_next(nd)) {
325                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
326                 symbols__insert_by_name(symbols, pos);
327         }
328 }
329
330 static struct symbol *symbols__find_by_name(struct rb_root *symbols,
331                                             const char *name)
332 {
333         struct rb_node *n;
334
335         if (symbols == NULL)
336                 return NULL;
337
338         n = symbols->rb_node;
339
340         while (n) {
341                 struct symbol_name_rb_node *s;
342                 int cmp;
343
344                 s = rb_entry(n, struct symbol_name_rb_node, rb_node);
345                 cmp = strcmp(name, s->sym.name);
346
347                 if (cmp < 0)
348                         n = n->rb_left;
349                 else if (cmp > 0)
350                         n = n->rb_right;
351                 else
352                         return &s->sym;
353         }
354
355         return NULL;
356 }
357
358 struct symbol *dso__find_symbol(struct dso *dso,
359                                 enum map_type type, u64 addr)
360 {
361         return symbols__find(&dso->symbols[type], addr);
362 }
363
364 struct symbol *dso__find_symbol_by_name(struct dso *dso, enum map_type type,
365                                         const char *name)
366 {
367         return symbols__find_by_name(&dso->symbol_names[type], name);
368 }
369
370 void dso__sort_by_name(struct dso *dso, enum map_type type)
371 {
372         dso__set_sorted_by_name(dso, type);
373         return symbols__sort_by_name(&dso->symbol_names[type],
374                                      &dso->symbols[type]);
375 }
376
377 int build_id__sprintf(const u8 *build_id, int len, char *bf)
378 {
379         char *bid = bf;
380         const u8 *raw = build_id;
381         int i;
382
383         for (i = 0; i < len; ++i) {
384                 sprintf(bid, "%02x", *raw);
385                 ++raw;
386                 bid += 2;
387         }
388
389         return raw - build_id;
390 }
391
392 size_t dso__fprintf_buildid(struct dso *dso, FILE *fp)
393 {
394         char sbuild_id[BUILD_ID_SIZE * 2 + 1];
395
396         build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
397         return fprintf(fp, "%s", sbuild_id);
398 }
399
400 size_t dso__fprintf_symbols_by_name(struct dso *dso,
401                                     enum map_type type, FILE *fp)
402 {
403         size_t ret = 0;
404         struct rb_node *nd;
405         struct symbol_name_rb_node *pos;
406
407         for (nd = rb_first(&dso->symbol_names[type]); nd; nd = rb_next(nd)) {
408                 pos = rb_entry(nd, struct symbol_name_rb_node, rb_node);
409                 fprintf(fp, "%s\n", pos->sym.name);
410         }
411
412         return ret;
413 }
414
415 size_t dso__fprintf(struct dso *dso, enum map_type type, FILE *fp)
416 {
417         struct rb_node *nd;
418         size_t ret = fprintf(fp, "dso: %s (", dso->short_name);
419
420         if (dso->short_name != dso->long_name)
421                 ret += fprintf(fp, "%s, ", dso->long_name);
422         ret += fprintf(fp, "%s, %sloaded, ", map_type__name[type],
423                        dso->loaded ? "" : "NOT ");
424         ret += dso__fprintf_buildid(dso, fp);
425         ret += fprintf(fp, ")\n");
426         for (nd = rb_first(&dso->symbols[type]); nd; nd = rb_next(nd)) {
427                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
428                 ret += symbol__fprintf(pos, fp);
429         }
430
431         return ret;
432 }
433
434 int kallsyms__parse(const char *filename, void *arg,
435                     int (*process_symbol)(void *arg, const char *name,
436                                           char type, u64 start, u64 end))
437 {
438         char *line = NULL;
439         size_t n;
440         int err = -1;
441         FILE *file = fopen(filename, "r");
442
443         if (file == NULL)
444                 goto out_failure;
445
446         err = 0;
447
448         while (!feof(file)) {
449                 u64 start;
450                 int line_len, len;
451                 char symbol_type;
452                 char *symbol_name;
453
454                 line_len = getline(&line, &n, file);
455                 if (line_len < 0 || !line)
456                         break;
457
458                 line[--line_len] = '\0'; /* \n */
459
460                 len = hex2u64(line, &start);
461
462                 len++;
463                 if (len + 2 >= line_len)
464                         continue;
465
466                 symbol_type = toupper(line[len]);
467                 len += 2;
468                 symbol_name = line + len;
469                 len = line_len - len;
470
471                 if (len >= KSYM_NAME_LEN) {
472                         err = -1;
473                         break;
474                 }
475
476                 /*
477                  * module symbols are not sorted so we add all
478                  * symbols with zero length and rely on
479                  * symbols__fixup_end() to fix it up.
480                  */
481                 err = process_symbol(arg, symbol_name,
482                                      symbol_type, start, start);
483                 if (err)
484                         break;
485         }
486
487         free(line);
488         fclose(file);
489         return err;
490
491 out_failure:
492         return -1;
493 }
494
495 struct process_kallsyms_args {
496         struct map *map;
497         struct dso *dso;
498 };
499
500 static u8 kallsyms2elf_type(char type)
501 {
502         if (type == 'W')
503                 return STB_WEAK;
504
505         return isupper(type) ? STB_GLOBAL : STB_LOCAL;
506 }
507
508 static int map__process_kallsym_symbol(void *arg, const char *name,
509                                        char type, u64 start, u64 end)
510 {
511         struct symbol *sym;
512         struct process_kallsyms_args *a = arg;
513         struct rb_root *root = &a->dso->symbols[a->map->type];
514
515         if (!symbol_type__is_a(type, a->map->type))
516                 return 0;
517
518         sym = symbol__new(start, end - start + 1,
519                           kallsyms2elf_type(type), name);
520         if (sym == NULL)
521                 return -ENOMEM;
522         /*
523          * We will pass the symbols to the filter later, in
524          * map__split_kallsyms, when we have split the maps per module
525          */
526         symbols__insert(root, sym);
527
528         return 0;
529 }
530
531 /*
532  * Loads the function entries in /proc/kallsyms into kernel_map->dso,
533  * so that we can in the next step set the symbol ->end address and then
534  * call kernel_maps__split_kallsyms.
535  */
536 static int dso__load_all_kallsyms(struct dso *dso, const char *filename,
537                                   struct map *map)
538 {
539         struct process_kallsyms_args args = { .map = map, .dso = dso, };
540         return kallsyms__parse(filename, &args, map__process_kallsym_symbol);
541 }
542
543 /*
544  * Split the symbols into maps, making sure there are no overlaps, i.e. the
545  * kernel range is broken in several maps, named [kernel].N, as we don't have
546  * the original ELF section names vmlinux have.
547  */
548 static int dso__split_kallsyms(struct dso *dso, struct map *map,
549                                symbol_filter_t filter)
550 {
551         struct map_groups *kmaps = map__kmap(map)->kmaps;
552         struct machine *machine = kmaps->machine;
553         struct map *curr_map = map;
554         struct symbol *pos;
555         int count = 0, moved = 0;       
556         struct rb_root *root = &dso->symbols[map->type];
557         struct rb_node *next = rb_first(root);
558         int kernel_range = 0;
559
560         while (next) {
561                 char *module;
562
563                 pos = rb_entry(next, struct symbol, rb_node);
564                 next = rb_next(&pos->rb_node);
565
566                 module = strchr(pos->name, '\t');
567                 if (module) {
568                         if (!symbol_conf.use_modules)
569                                 goto discard_symbol;
570
571                         *module++ = '\0';
572
573                         if (strcmp(curr_map->dso->short_name, module)) {
574                                 if (curr_map != map &&
575                                     dso->kernel == DSO_TYPE_GUEST_KERNEL &&
576                                     machine__is_default_guest(machine)) {
577                                         /*
578                                          * We assume all symbols of a module are
579                                          * continuous in * kallsyms, so curr_map
580                                          * points to a module and all its
581                                          * symbols are in its kmap. Mark it as
582                                          * loaded.
583                                          */
584                                         dso__set_loaded(curr_map->dso,
585                                                         curr_map->type);
586                                 }
587
588                                 curr_map = map_groups__find_by_name(kmaps,
589                                                         map->type, module);
590                                 if (curr_map == NULL) {
591                                         pr_debug("%s/proc/{kallsyms,modules} "
592                                                  "inconsistency while looking "
593                                                  "for \"%s\" module!\n",
594                                                  machine->root_dir, module);
595                                         curr_map = map;
596                                         goto discard_symbol;
597                                 }
598
599                                 if (curr_map->dso->loaded &&
600                                     !machine__is_default_guest(machine))
601                                         goto discard_symbol;
602                         }
603                         /*
604                          * So that we look just like we get from .ko files,
605                          * i.e. not prelinked, relative to map->start.
606                          */
607                         pos->start = curr_map->map_ip(curr_map, pos->start);
608                         pos->end   = curr_map->map_ip(curr_map, pos->end);
609                 } else if (curr_map != map) {
610                         char dso_name[PATH_MAX];
611                         struct dso *ndso;
612
613                         if (count == 0) {
614                                 curr_map = map;
615                                 goto filter_symbol;
616                         }
617
618                         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
619                                 snprintf(dso_name, sizeof(dso_name),
620                                         "[guest.kernel].%d",
621                                         kernel_range++);
622                         else
623                                 snprintf(dso_name, sizeof(dso_name),
624                                         "[kernel].%d",
625                                         kernel_range++);
626
627                         ndso = dso__new(dso_name);
628                         if (ndso == NULL)
629                                 return -1;
630
631                         ndso->kernel = dso->kernel;
632
633                         curr_map = map__new2(pos->start, ndso, map->type);
634                         if (curr_map == NULL) {
635                                 dso__delete(ndso);
636                                 return -1;
637                         }
638
639                         curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
640                         map_groups__insert(kmaps, curr_map);
641                         ++kernel_range;
642                 }
643 filter_symbol:
644                 if (filter && filter(curr_map, pos)) {
645 discard_symbol:         rb_erase(&pos->rb_node, root);
646                         symbol__delete(pos);
647                 } else {
648                         if (curr_map != map) {
649                                 rb_erase(&pos->rb_node, root);
650                                 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
651                                 ++moved;
652                         } else
653                                 ++count;
654                 }
655         }
656
657         if (curr_map != map &&
658             dso->kernel == DSO_TYPE_GUEST_KERNEL &&
659             machine__is_default_guest(kmaps->machine)) {
660                 dso__set_loaded(curr_map->dso, curr_map->type);
661         }
662
663         return count + moved;
664 }
665
666 static bool symbol__restricted_filename(const char *filename,
667                                         const char *restricted_filename)
668 {
669         bool restricted = false;
670
671         if (symbol_conf.kptr_restrict) {
672                 char *r = realpath(filename, NULL);
673
674                 if (r != NULL) {
675                         restricted = strcmp(r, restricted_filename) == 0;
676                         free(r);
677                         return restricted;
678                 }
679         }
680
681         return restricted;
682 }
683
684 int dso__load_kallsyms(struct dso *dso, const char *filename,
685                        struct map *map, symbol_filter_t filter)
686 {
687         if (symbol__restricted_filename(filename, "/proc/kallsyms"))
688                 return -1;
689
690         if (dso__load_all_kallsyms(dso, filename, map) < 0)
691                 return -1;
692
693         symbols__fixup_end(&dso->symbols[map->type]);
694
695         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
696                 dso->symtab_type = SYMTAB__GUEST_KALLSYMS;
697         else
698                 dso->symtab_type = SYMTAB__KALLSYMS;
699
700         return dso__split_kallsyms(dso, map, filter);
701 }
702
703 static int dso__load_perf_map(struct dso *dso, struct map *map,
704                               symbol_filter_t filter)
705 {
706         char *line = NULL;
707         size_t n;
708         FILE *file;
709         int nr_syms = 0;
710
711         file = fopen(dso->long_name, "r");
712         if (file == NULL)
713                 goto out_failure;
714
715         while (!feof(file)) {
716                 u64 start, size;
717                 struct symbol *sym;
718                 int line_len, len;
719
720                 line_len = getline(&line, &n, file);
721                 if (line_len < 0)
722                         break;
723
724                 if (!line)
725                         goto out_failure;
726
727                 line[--line_len] = '\0'; /* \n */
728
729                 len = hex2u64(line, &start);
730
731                 len++;
732                 if (len + 2 >= line_len)
733                         continue;
734
735                 len += hex2u64(line + len, &size);
736
737                 len++;
738                 if (len + 2 >= line_len)
739                         continue;
740
741                 sym = symbol__new(start, size, STB_GLOBAL, line + len);
742
743                 if (sym == NULL)
744                         goto out_delete_line;
745
746                 if (filter && filter(map, sym))
747                         symbol__delete(sym);
748                 else {
749                         symbols__insert(&dso->symbols[map->type], sym);
750                         nr_syms++;
751                 }
752         }
753
754         free(line);
755         fclose(file);
756
757         return nr_syms;
758
759 out_delete_line:
760         free(line);
761 out_failure:
762         return -1;
763 }
764
765 /**
766  * elf_symtab__for_each_symbol - iterate thru all the symbols
767  *
768  * @syms: struct elf_symtab instance to iterate
769  * @idx: uint32_t idx
770  * @sym: GElf_Sym iterator
771  */
772 #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
773         for (idx = 0, gelf_getsym(syms, idx, &sym);\
774              idx < nr_syms; \
775              idx++, gelf_getsym(syms, idx, &sym))
776
777 static inline uint8_t elf_sym__type(const GElf_Sym *sym)
778 {
779         return GELF_ST_TYPE(sym->st_info);
780 }
781
782 static inline int elf_sym__is_function(const GElf_Sym *sym)
783 {
784         return elf_sym__type(sym) == STT_FUNC &&
785                sym->st_name != 0 &&
786                sym->st_shndx != SHN_UNDEF;
787 }
788
789 static inline bool elf_sym__is_object(const GElf_Sym *sym)
790 {
791         return elf_sym__type(sym) == STT_OBJECT &&
792                 sym->st_name != 0 &&
793                 sym->st_shndx != SHN_UNDEF;
794 }
795
796 static inline int elf_sym__is_label(const GElf_Sym *sym)
797 {
798         return elf_sym__type(sym) == STT_NOTYPE &&
799                 sym->st_name != 0 &&
800                 sym->st_shndx != SHN_UNDEF &&
801                 sym->st_shndx != SHN_ABS;
802 }
803
804 static inline const char *elf_sec__name(const GElf_Shdr *shdr,
805                                         const Elf_Data *secstrs)
806 {
807         return secstrs->d_buf + shdr->sh_name;
808 }
809
810 static inline int elf_sec__is_text(const GElf_Shdr *shdr,
811                                         const Elf_Data *secstrs)
812 {
813         return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
814 }
815
816 static inline bool elf_sec__is_data(const GElf_Shdr *shdr,
817                                     const Elf_Data *secstrs)
818 {
819         return strstr(elf_sec__name(shdr, secstrs), "data") != NULL;
820 }
821
822 static inline const char *elf_sym__name(const GElf_Sym *sym,
823                                         const Elf_Data *symstrs)
824 {
825         return symstrs->d_buf + sym->st_name;
826 }
827
828 static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
829                                     GElf_Shdr *shp, const char *name,
830                                     size_t *idx)
831 {
832         Elf_Scn *sec = NULL;
833         size_t cnt = 1;
834
835         while ((sec = elf_nextscn(elf, sec)) != NULL) {
836                 char *str;
837
838                 gelf_getshdr(sec, shp);
839                 str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
840                 if (!strcmp(name, str)) {
841                         if (idx)
842                                 *idx = cnt;
843                         break;
844                 }
845                 ++cnt;
846         }
847
848         return sec;
849 }
850
851 #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
852         for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \
853              idx < nr_entries; \
854              ++idx, pos = gelf_getrel(reldata, idx, &pos_mem))
855
856 #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \
857         for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \
858              idx < nr_entries; \
859              ++idx, pos = gelf_getrela(reldata, idx, &pos_mem))
860
861 /*
862  * We need to check if we have a .dynsym, so that we can handle the
863  * .plt, synthesizing its symbols, that aren't on the symtabs (be it
864  * .dynsym or .symtab).
865  * And always look at the original dso, not at debuginfo packages, that
866  * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
867  */
868 static int dso__synthesize_plt_symbols(struct  dso *dso, struct map *map,
869                                        symbol_filter_t filter)
870 {
871         uint32_t nr_rel_entries, idx;
872         GElf_Sym sym;
873         u64 plt_offset;
874         GElf_Shdr shdr_plt;
875         struct symbol *f;
876         GElf_Shdr shdr_rel_plt, shdr_dynsym;
877         Elf_Data *reldata, *syms, *symstrs;
878         Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym;
879         size_t dynsym_idx;
880         GElf_Ehdr ehdr;
881         char sympltname[1024];
882         Elf *elf;
883         int nr = 0, symidx, fd, err = 0;
884         char name[PATH_MAX];
885
886         snprintf(name, sizeof(name), "%s%s",
887                  symbol_conf.symfs, dso->long_name);
888         fd = open(name, O_RDONLY);
889         if (fd < 0)
890                 goto out;
891
892         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
893         if (elf == NULL)
894                 goto out_close;
895
896         if (gelf_getehdr(elf, &ehdr) == NULL)
897                 goto out_elf_end;
898
899         scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym,
900                                          ".dynsym", &dynsym_idx);
901         if (scn_dynsym == NULL)
902                 goto out_elf_end;
903
904         scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
905                                           ".rela.plt", NULL);
906         if (scn_plt_rel == NULL) {
907                 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
908                                                   ".rel.plt", NULL);
909                 if (scn_plt_rel == NULL)
910                         goto out_elf_end;
911         }
912
913         err = -1;
914
915         if (shdr_rel_plt.sh_link != dynsym_idx)
916                 goto out_elf_end;
917
918         if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL)
919                 goto out_elf_end;
920
921         /*
922          * Fetch the relocation section to find the idxes to the GOT
923          * and the symbols in the .dynsym they refer to.
924          */
925         reldata = elf_getdata(scn_plt_rel, NULL);
926         if (reldata == NULL)
927                 goto out_elf_end;
928
929         syms = elf_getdata(scn_dynsym, NULL);
930         if (syms == NULL)
931                 goto out_elf_end;
932
933         scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link);
934         if (scn_symstrs == NULL)
935                 goto out_elf_end;
936
937         symstrs = elf_getdata(scn_symstrs, NULL);
938         if (symstrs == NULL)
939                 goto out_elf_end;
940
941         nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize;
942         plt_offset = shdr_plt.sh_offset;
943
944         if (shdr_rel_plt.sh_type == SHT_RELA) {
945                 GElf_Rela pos_mem, *pos;
946
947                 elf_section__for_each_rela(reldata, pos, pos_mem, idx,
948                                            nr_rel_entries) {
949                         symidx = GELF_R_SYM(pos->r_info);
950                         plt_offset += shdr_plt.sh_entsize;
951                         gelf_getsym(syms, symidx, &sym);
952                         snprintf(sympltname, sizeof(sympltname),
953                                  "%s@plt", elf_sym__name(&sym, symstrs));
954
955                         f = symbol__new(plt_offset, shdr_plt.sh_entsize,
956                                         STB_GLOBAL, sympltname);
957                         if (!f)
958                                 goto out_elf_end;
959
960                         if (filter && filter(map, f))
961                                 symbol__delete(f);
962                         else {
963                                 symbols__insert(&dso->symbols[map->type], f);
964                                 ++nr;
965                         }
966                 }
967         } else if (shdr_rel_plt.sh_type == SHT_REL) {
968                 GElf_Rel pos_mem, *pos;
969                 elf_section__for_each_rel(reldata, pos, pos_mem, idx,
970                                           nr_rel_entries) {
971                         symidx = GELF_R_SYM(pos->r_info);
972                         plt_offset += shdr_plt.sh_entsize;
973                         gelf_getsym(syms, symidx, &sym);
974                         snprintf(sympltname, sizeof(sympltname),
975                                  "%s@plt", elf_sym__name(&sym, symstrs));
976
977                         f = symbol__new(plt_offset, shdr_plt.sh_entsize,
978                                         STB_GLOBAL, sympltname);
979                         if (!f)
980                                 goto out_elf_end;
981
982                         if (filter && filter(map, f))
983                                 symbol__delete(f);
984                         else {
985                                 symbols__insert(&dso->symbols[map->type], f);
986                                 ++nr;
987                         }
988                 }
989         }
990
991         err = 0;
992 out_elf_end:
993         elf_end(elf);
994 out_close:
995         close(fd);
996
997         if (err == 0)
998                 return nr;
999 out:
1000         pr_debug("%s: problems reading %s PLT info.\n",
1001                  __func__, dso->long_name);
1002         return 0;
1003 }
1004
1005 static bool elf_sym__is_a(GElf_Sym *sym, enum map_type type)
1006 {
1007         switch (type) {
1008         case MAP__FUNCTION:
1009                 return elf_sym__is_function(sym);
1010         case MAP__VARIABLE:
1011                 return elf_sym__is_object(sym);
1012         default:
1013                 return false;
1014         }
1015 }
1016
1017 static bool elf_sec__is_a(GElf_Shdr *shdr, Elf_Data *secstrs,
1018                           enum map_type type)
1019 {
1020         switch (type) {
1021         case MAP__FUNCTION:
1022                 return elf_sec__is_text(shdr, secstrs);
1023         case MAP__VARIABLE:
1024                 return elf_sec__is_data(shdr, secstrs);
1025         default:
1026                 return false;
1027         }
1028 }
1029
1030 static size_t elf_addr_to_index(Elf *elf, GElf_Addr addr)
1031 {
1032         Elf_Scn *sec = NULL;
1033         GElf_Shdr shdr;
1034         size_t cnt = 1;
1035
1036         while ((sec = elf_nextscn(elf, sec)) != NULL) {
1037                 gelf_getshdr(sec, &shdr);
1038
1039                 if ((addr >= shdr.sh_addr) &&
1040                     (addr < (shdr.sh_addr + shdr.sh_size)))
1041                         return cnt;
1042
1043                 ++cnt;
1044         }
1045
1046         return -1;
1047 }
1048
1049 static int dso__load_sym(struct dso *dso, struct map *map, const char *name,
1050                          int fd, symbol_filter_t filter, int kmodule,
1051                          int want_symtab)
1052 {
1053         struct kmap *kmap = dso->kernel ? map__kmap(map) : NULL;
1054         struct map *curr_map = map;
1055         struct dso *curr_dso = dso;
1056         Elf_Data *symstrs, *secstrs;
1057         uint32_t nr_syms;
1058         int err = -1;
1059         uint32_t idx;
1060         GElf_Ehdr ehdr;
1061         GElf_Shdr shdr, opdshdr;
1062         Elf_Data *syms, *opddata = NULL;
1063         GElf_Sym sym;
1064         Elf_Scn *sec, *sec_strndx, *opdsec;
1065         Elf *elf;
1066         int nr = 0;
1067         size_t opdidx = 0;
1068
1069         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1070         if (elf == NULL) {
1071                 pr_debug("%s: cannot read %s ELF file.\n", __func__, name);
1072                 goto out_close;
1073         }
1074
1075         if (gelf_getehdr(elf, &ehdr) == NULL) {
1076                 pr_debug("%s: cannot get elf header.\n", __func__);
1077                 goto out_elf_end;
1078         }
1079
1080         /* Always reject images with a mismatched build-id: */
1081         if (dso->has_build_id) {
1082                 u8 build_id[BUILD_ID_SIZE];
1083
1084                 if (elf_read_build_id(elf, build_id,
1085                                       BUILD_ID_SIZE) != BUILD_ID_SIZE)
1086                         goto out_elf_end;
1087
1088                 if (!dso__build_id_equal(dso, build_id))
1089                         goto out_elf_end;
1090         }
1091
1092         sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL);
1093         if (sec == NULL) {
1094                 if (want_symtab)
1095                         goto out_elf_end;
1096
1097                 sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL);
1098                 if (sec == NULL)
1099                         goto out_elf_end;
1100         }
1101
1102         opdsec = elf_section_by_name(elf, &ehdr, &opdshdr, ".opd", &opdidx);
1103         if (opdshdr.sh_type != SHT_PROGBITS)
1104                 opdsec = NULL;
1105         if (opdsec)
1106                 opddata = elf_rawdata(opdsec, NULL);
1107
1108         syms = elf_getdata(sec, NULL);
1109         if (syms == NULL)
1110                 goto out_elf_end;
1111
1112         sec = elf_getscn(elf, shdr.sh_link);
1113         if (sec == NULL)
1114                 goto out_elf_end;
1115
1116         symstrs = elf_getdata(sec, NULL);
1117         if (symstrs == NULL)
1118                 goto out_elf_end;
1119
1120         sec_strndx = elf_getscn(elf, ehdr.e_shstrndx);
1121         if (sec_strndx == NULL)
1122                 goto out_elf_end;
1123
1124         secstrs = elf_getdata(sec_strndx, NULL);
1125         if (secstrs == NULL)
1126                 goto out_elf_end;
1127
1128         nr_syms = shdr.sh_size / shdr.sh_entsize;
1129
1130         memset(&sym, 0, sizeof(sym));
1131         if (dso->kernel == DSO_TYPE_USER) {
1132                 dso->adjust_symbols = (ehdr.e_type == ET_EXEC ||
1133                                 elf_section_by_name(elf, &ehdr, &shdr,
1134                                                      ".gnu.prelink_undo",
1135                                                      NULL) != NULL);
1136         } else {
1137                 dso->adjust_symbols = 0;
1138         }
1139         elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
1140                 struct symbol *f;
1141                 const char *elf_name = elf_sym__name(&sym, symstrs);
1142                 char *demangled = NULL;
1143                 int is_label = elf_sym__is_label(&sym);
1144                 const char *section_name;
1145
1146                 if (kmap && kmap->ref_reloc_sym && kmap->ref_reloc_sym->name &&
1147                     strcmp(elf_name, kmap->ref_reloc_sym->name) == 0)
1148                         kmap->ref_reloc_sym->unrelocated_addr = sym.st_value;
1149
1150                 if (!is_label && !elf_sym__is_a(&sym, map->type))
1151                         continue;
1152
1153                 /* Reject ARM ELF "mapping symbols": these aren't unique and
1154                  * don't identify functions, so will confuse the profile
1155                  * output: */
1156                 if (ehdr.e_machine == EM_ARM) {
1157                         if (!strcmp(elf_name, "$a") ||
1158                             !strcmp(elf_name, "$d") ||
1159                             !strcmp(elf_name, "$t"))
1160                                 continue;
1161                 }
1162
1163                 if (opdsec && sym.st_shndx == opdidx) {
1164                         u32 offset = sym.st_value - opdshdr.sh_addr;
1165                         u64 *opd = opddata->d_buf + offset;
1166                         sym.st_value = *opd;
1167                         sym.st_shndx = elf_addr_to_index(elf, sym.st_value);
1168                 }
1169
1170                 sec = elf_getscn(elf, sym.st_shndx);
1171                 if (!sec)
1172                         goto out_elf_end;
1173
1174                 gelf_getshdr(sec, &shdr);
1175
1176                 if (is_label && !elf_sec__is_a(&shdr, secstrs, map->type))
1177                         continue;
1178
1179                 section_name = elf_sec__name(&shdr, secstrs);
1180
1181                 /* On ARM, symbols for thumb functions have 1 added to
1182                  * the symbol address as a flag - remove it */
1183                 if ((ehdr.e_machine == EM_ARM) &&
1184                     (map->type == MAP__FUNCTION) &&
1185                     (sym.st_value & 1))
1186                         --sym.st_value;
1187
1188                 if (dso->kernel != DSO_TYPE_USER || kmodule) {
1189                         char dso_name[PATH_MAX];
1190
1191                         if (strcmp(section_name,
1192                                    (curr_dso->short_name +
1193                                     dso->short_name_len)) == 0)
1194                                 goto new_symbol;
1195
1196                         if (strcmp(section_name, ".text") == 0) {
1197                                 curr_map = map;
1198                                 curr_dso = dso;
1199                                 goto new_symbol;
1200                         }
1201
1202                         snprintf(dso_name, sizeof(dso_name),
1203                                  "%s%s", dso->short_name, section_name);
1204
1205                         curr_map = map_groups__find_by_name(kmap->kmaps, map->type, dso_name);
1206                         if (curr_map == NULL) {
1207                                 u64 start = sym.st_value;
1208
1209                                 if (kmodule)
1210                                         start += map->start + shdr.sh_offset;
1211
1212                                 curr_dso = dso__new(dso_name);
1213                                 if (curr_dso == NULL)
1214                                         goto out_elf_end;
1215                                 curr_dso->kernel = dso->kernel;
1216                                 curr_dso->long_name = dso->long_name;
1217                                 curr_dso->long_name_len = dso->long_name_len;
1218                                 curr_map = map__new2(start, curr_dso,
1219                                                      map->type);
1220                                 if (curr_map == NULL) {
1221                                         dso__delete(curr_dso);
1222                                         goto out_elf_end;
1223                                 }
1224                                 curr_map->map_ip = identity__map_ip;
1225                                 curr_map->unmap_ip = identity__map_ip;
1226                                 curr_dso->symtab_type = dso->symtab_type;
1227                                 map_groups__insert(kmap->kmaps, curr_map);
1228                                 dsos__add(&dso->node, curr_dso);
1229                                 dso__set_loaded(curr_dso, map->type);
1230                         } else
1231                                 curr_dso = curr_map->dso;
1232
1233                         goto new_symbol;
1234                 }
1235
1236                 if (curr_dso->adjust_symbols) {
1237                         pr_debug4("%s: adjusting symbol: st_value: %#" PRIx64 " "
1238                                   "sh_addr: %#" PRIx64 " sh_offset: %#" PRIx64 "\n", __func__,
1239                                   (u64)sym.st_value, (u64)shdr.sh_addr,
1240                                   (u64)shdr.sh_offset);
1241                         sym.st_value -= shdr.sh_addr - shdr.sh_offset;
1242                 }
1243                 /*
1244                  * We need to figure out if the object was created from C++ sources
1245                  * DWARF DW_compile_unit has this, but we don't always have access
1246                  * to it...
1247                  */
1248                 demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI);
1249                 if (demangled != NULL)
1250                         elf_name = demangled;
1251 new_symbol:
1252                 f = symbol__new(sym.st_value, sym.st_size,
1253                                 GELF_ST_BIND(sym.st_info), elf_name);
1254                 free(demangled);
1255                 if (!f)
1256                         goto out_elf_end;
1257
1258                 if (filter && filter(curr_map, f))
1259                         symbol__delete(f);
1260                 else {
1261                         symbols__insert(&curr_dso->symbols[curr_map->type], f);
1262                         nr++;
1263                 }
1264         }
1265
1266         /*
1267          * For misannotated, zeroed, ASM function sizes.
1268          */
1269         if (nr > 0) {
1270                 symbols__fixup_end(&dso->symbols[map->type]);
1271                 if (kmap) {
1272                         /*
1273                          * We need to fixup this here too because we create new
1274                          * maps here, for things like vsyscall sections.
1275                          */
1276                         __map_groups__fixup_end(kmap->kmaps, map->type);
1277                 }
1278         }
1279         err = nr;
1280 out_elf_end:
1281         elf_end(elf);
1282 out_close:
1283         return err;
1284 }
1285
1286 static bool dso__build_id_equal(const struct dso *dso, u8 *build_id)
1287 {
1288         return memcmp(dso->build_id, build_id, sizeof(dso->build_id)) == 0;
1289 }
1290
1291 bool __dsos__read_build_ids(struct list_head *head, bool with_hits)
1292 {
1293         bool have_build_id = false;
1294         struct dso *pos;
1295
1296         list_for_each_entry(pos, head, node) {
1297                 if (with_hits && !pos->hit)
1298                         continue;
1299                 if (pos->has_build_id) {
1300                         have_build_id = true;
1301                         continue;
1302                 }
1303                 if (filename__read_build_id(pos->long_name, pos->build_id,
1304                                             sizeof(pos->build_id)) > 0) {
1305                         have_build_id     = true;
1306                         pos->has_build_id = true;
1307                 }
1308         }
1309
1310         return have_build_id;
1311 }
1312
1313 /*
1314  * Align offset to 4 bytes as needed for note name and descriptor data.
1315  */
1316 #define NOTE_ALIGN(n) (((n) + 3) & -4U)
1317
1318 static int elf_read_build_id(Elf *elf, void *bf, size_t size)
1319 {
1320         int err = -1;
1321         GElf_Ehdr ehdr;
1322         GElf_Shdr shdr;
1323         Elf_Data *data;
1324         Elf_Scn *sec;
1325         Elf_Kind ek;
1326         void *ptr;
1327
1328         if (size < BUILD_ID_SIZE)
1329                 goto out;
1330
1331         ek = elf_kind(elf);
1332         if (ek != ELF_K_ELF)
1333                 goto out;
1334
1335         if (gelf_getehdr(elf, &ehdr) == NULL) {
1336                 pr_err("%s: cannot get elf header.\n", __func__);
1337                 goto out;
1338         }
1339
1340         sec = elf_section_by_name(elf, &ehdr, &shdr,
1341                                   ".note.gnu.build-id", NULL);
1342         if (sec == NULL) {
1343                 sec = elf_section_by_name(elf, &ehdr, &shdr,
1344                                           ".notes", NULL);
1345                 if (sec == NULL)
1346                         goto out;
1347         }
1348
1349         data = elf_getdata(sec, NULL);
1350         if (data == NULL)
1351                 goto out;
1352
1353         ptr = data->d_buf;
1354         while (ptr < (data->d_buf + data->d_size)) {
1355                 GElf_Nhdr *nhdr = ptr;
1356                 int namesz = NOTE_ALIGN(nhdr->n_namesz),
1357                     descsz = NOTE_ALIGN(nhdr->n_descsz);
1358                 const char *name;
1359
1360                 ptr += sizeof(*nhdr);
1361                 name = ptr;
1362                 ptr += namesz;
1363                 if (nhdr->n_type == NT_GNU_BUILD_ID &&
1364                     nhdr->n_namesz == sizeof("GNU")) {
1365                         if (memcmp(name, "GNU", sizeof("GNU")) == 0) {
1366                                 memcpy(bf, ptr, BUILD_ID_SIZE);
1367                                 err = BUILD_ID_SIZE;
1368                                 break;
1369                         }
1370                 }
1371                 ptr += descsz;
1372         }
1373
1374 out:
1375         return err;
1376 }
1377
1378 int filename__read_build_id(const char *filename, void *bf, size_t size)
1379 {
1380         int fd, err = -1;
1381         Elf *elf;
1382
1383         if (size < BUILD_ID_SIZE)
1384                 goto out;
1385
1386         fd = open(filename, O_RDONLY);
1387         if (fd < 0)
1388                 goto out;
1389
1390         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1391         if (elf == NULL) {
1392                 pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename);
1393                 goto out_close;
1394         }
1395
1396         err = elf_read_build_id(elf, bf, size);
1397
1398         elf_end(elf);
1399 out_close:
1400         close(fd);
1401 out:
1402         return err;
1403 }
1404
1405 int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
1406 {
1407         int fd, err = -1;
1408
1409         if (size < BUILD_ID_SIZE)
1410                 goto out;
1411
1412         fd = open(filename, O_RDONLY);
1413         if (fd < 0)
1414                 goto out;
1415
1416         while (1) {
1417                 char bf[BUFSIZ];
1418                 GElf_Nhdr nhdr;
1419                 int namesz, descsz;
1420
1421                 if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr))
1422                         break;
1423
1424                 namesz = NOTE_ALIGN(nhdr.n_namesz);
1425                 descsz = NOTE_ALIGN(nhdr.n_descsz);
1426                 if (nhdr.n_type == NT_GNU_BUILD_ID &&
1427                     nhdr.n_namesz == sizeof("GNU")) {
1428                         if (read(fd, bf, namesz) != namesz)
1429                                 break;
1430                         if (memcmp(bf, "GNU", sizeof("GNU")) == 0) {
1431                                 if (read(fd, build_id,
1432                                     BUILD_ID_SIZE) == BUILD_ID_SIZE) {
1433                                         err = 0;
1434                                         break;
1435                                 }
1436                         } else if (read(fd, bf, descsz) != descsz)
1437                                 break;
1438                 } else {
1439                         int n = namesz + descsz;
1440                         if (read(fd, bf, n) != n)
1441                                 break;
1442                 }
1443         }
1444         close(fd);
1445 out:
1446         return err;
1447 }
1448
1449 char dso__symtab_origin(const struct dso *dso)
1450 {
1451         static const char origin[] = {
1452                 [SYMTAB__KALLSYMS]            = 'k',
1453                 [SYMTAB__JAVA_JIT]            = 'j',
1454                 [SYMTAB__BUILD_ID_CACHE]      = 'B',
1455                 [SYMTAB__FEDORA_DEBUGINFO]    = 'f',
1456                 [SYMTAB__UBUNTU_DEBUGINFO]    = 'u',
1457                 [SYMTAB__BUILDID_DEBUGINFO]   = 'b',
1458                 [SYMTAB__SYSTEM_PATH_DSO]     = 'd',
1459                 [SYMTAB__SYSTEM_PATH_KMODULE] = 'K',
1460                 [SYMTAB__GUEST_KALLSYMS]      =  'g',
1461                 [SYMTAB__GUEST_KMODULE]       =  'G',
1462         };
1463
1464         if (dso == NULL || dso->symtab_type == SYMTAB__NOT_FOUND)
1465                 return '!';
1466         return origin[dso->symtab_type];
1467 }
1468
1469 int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
1470 {
1471         int size = PATH_MAX;
1472         char *name;
1473         int ret = -1;
1474         int fd;
1475         struct machine *machine;
1476         const char *root_dir;
1477         int want_symtab;
1478
1479         dso__set_loaded(dso, map->type);
1480
1481         if (dso->kernel == DSO_TYPE_KERNEL)
1482                 return dso__load_kernel_sym(dso, map, filter);
1483         else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1484                 return dso__load_guest_kernel_sym(dso, map, filter);
1485
1486         if (map->groups && map->groups->machine)
1487                 machine = map->groups->machine;
1488         else
1489                 machine = NULL;
1490
1491         name = malloc(size);
1492         if (!name)
1493                 return -1;
1494
1495         dso->adjust_symbols = 0;
1496
1497         if (strncmp(dso->name, "/tmp/perf-", 10) == 0) {
1498                 struct stat st;
1499
1500                 if (lstat(dso->name, &st) < 0)
1501                         return -1;
1502
1503                 if (st.st_uid && (st.st_uid != geteuid())) {
1504                         pr_warning("File %s not owned by current user or root, "
1505                                 "ignoring it.\n", dso->name);
1506                         return -1;
1507                 }
1508
1509                 ret = dso__load_perf_map(dso, map, filter);
1510                 dso->symtab_type = ret > 0 ? SYMTAB__JAVA_JIT :
1511                                               SYMTAB__NOT_FOUND;
1512                 return ret;
1513         }
1514
1515         /* Iterate over candidate debug images.
1516          * On the first pass, only load images if they have a full symtab.
1517          * Failing that, do a second pass where we accept .dynsym also
1518          */
1519         want_symtab = 1;
1520 restart:
1521         for (dso->symtab_type = SYMTAB__BUILD_ID_CACHE;
1522              dso->symtab_type != SYMTAB__NOT_FOUND;
1523              dso->symtab_type++) {
1524                 switch (dso->symtab_type) {
1525                 case SYMTAB__BUILD_ID_CACHE:
1526                         /* skip the locally configured cache if a symfs is given */
1527                         if (symbol_conf.symfs[0] ||
1528                             (dso__build_id_filename(dso, name, size) == NULL)) {
1529                                 continue;
1530                         }
1531                         break;
1532                 case SYMTAB__FEDORA_DEBUGINFO:
1533                         snprintf(name, size, "%s/usr/lib/debug%s.debug",
1534                                  symbol_conf.symfs, dso->long_name);
1535                         break;
1536                 case SYMTAB__UBUNTU_DEBUGINFO:
1537                         snprintf(name, size, "%s/usr/lib/debug%s",
1538                                  symbol_conf.symfs, dso->long_name);
1539                         break;
1540                 case SYMTAB__BUILDID_DEBUGINFO: {
1541                         char build_id_hex[BUILD_ID_SIZE * 2 + 1];
1542
1543                         if (!dso->has_build_id)
1544                                 continue;
1545
1546                         build_id__sprintf(dso->build_id,
1547                                           sizeof(dso->build_id),
1548                                           build_id_hex);
1549                         snprintf(name, size,
1550                                  "%s/usr/lib/debug/.build-id/%.2s/%s.debug",
1551                                  symbol_conf.symfs, build_id_hex, build_id_hex + 2);
1552                         }
1553                         break;
1554                 case SYMTAB__SYSTEM_PATH_DSO:
1555                         snprintf(name, size, "%s%s",
1556                              symbol_conf.symfs, dso->long_name);
1557                         break;
1558                 case SYMTAB__GUEST_KMODULE:
1559                         if (map->groups && machine)
1560                                 root_dir = machine->root_dir;
1561                         else
1562                                 root_dir = "";
1563                         snprintf(name, size, "%s%s%s", symbol_conf.symfs,
1564                                  root_dir, dso->long_name);
1565                         break;
1566
1567                 case SYMTAB__SYSTEM_PATH_KMODULE:
1568                         snprintf(name, size, "%s%s", symbol_conf.symfs,
1569                                  dso->long_name);
1570                         break;
1571                 default:;
1572                 }
1573
1574                 /* Name is now the name of the next image to try */
1575                 fd = open(name, O_RDONLY);
1576                 if (fd < 0)
1577                         continue;
1578
1579                 ret = dso__load_sym(dso, map, name, fd, filter, 0,
1580                                     want_symtab);
1581                 close(fd);
1582
1583                 /*
1584                  * Some people seem to have debuginfo files _WITHOUT_ debug
1585                  * info!?!?
1586                  */
1587                 if (!ret)
1588                         continue;
1589
1590                 if (ret > 0) {
1591                         int nr_plt = dso__synthesize_plt_symbols(dso, map,
1592                                                                  filter);
1593                         if (nr_plt > 0)
1594                                 ret += nr_plt;
1595                         break;
1596                 }
1597         }
1598
1599         /*
1600          * If we wanted a full symtab but no image had one,
1601          * relax our requirements and repeat the search.
1602          */
1603         if (ret <= 0 && want_symtab) {
1604                 want_symtab = 0;
1605                 goto restart;
1606         }
1607
1608         free(name);
1609         if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1610                 return 0;
1611         return ret;
1612 }
1613
1614 struct map *map_groups__find_by_name(struct map_groups *mg,
1615                                      enum map_type type, const char *name)
1616 {
1617         struct rb_node *nd;
1618
1619         for (nd = rb_first(&mg->maps[type]); nd; nd = rb_next(nd)) {
1620                 struct map *map = rb_entry(nd, struct map, rb_node);
1621
1622                 if (map->dso && strcmp(map->dso->short_name, name) == 0)
1623                         return map;
1624         }
1625
1626         return NULL;
1627 }
1628
1629 static int dso__kernel_module_get_build_id(struct dso *dso,
1630                                            const char *root_dir)
1631 {
1632         char filename[PATH_MAX];
1633         /*
1634          * kernel module short names are of the form "[module]" and
1635          * we need just "module" here.
1636          */
1637         const char *name = dso->short_name + 1;
1638
1639         snprintf(filename, sizeof(filename),
1640                  "%s/sys/module/%.*s/notes/.note.gnu.build-id",
1641                  root_dir, (int)strlen(name) - 1, name);
1642
1643         if (sysfs__read_build_id(filename, dso->build_id,
1644                                  sizeof(dso->build_id)) == 0)
1645                 dso->has_build_id = true;
1646
1647         return 0;
1648 }
1649
1650 static int map_groups__set_modules_path_dir(struct map_groups *mg,
1651                                 const char *dir_name)
1652 {
1653         struct dirent *dent;
1654         DIR *dir = opendir(dir_name);
1655         int ret = 0;
1656
1657         if (!dir) {
1658                 pr_debug("%s: cannot open %s dir\n", __func__, dir_name);
1659                 return -1;
1660         }
1661
1662         while ((dent = readdir(dir)) != NULL) {
1663                 char path[PATH_MAX];
1664                 struct stat st;
1665
1666                 /*sshfs might return bad dent->d_type, so we have to stat*/
1667                 sprintf(path, "%s/%s", dir_name, dent->d_name);
1668                 if (stat(path, &st))
1669                         continue;
1670
1671                 if (S_ISDIR(st.st_mode)) {
1672                         if (!strcmp(dent->d_name, ".") ||
1673                             !strcmp(dent->d_name, ".."))
1674                                 continue;
1675
1676                         snprintf(path, sizeof(path), "%s/%s",
1677                                  dir_name, dent->d_name);
1678                         ret = map_groups__set_modules_path_dir(mg, path);
1679                         if (ret < 0)
1680                                 goto out;
1681                 } else {
1682                         char *dot = strrchr(dent->d_name, '.'),
1683                              dso_name[PATH_MAX];
1684                         struct map *map;
1685                         char *long_name;
1686
1687                         if (dot == NULL || strcmp(dot, ".ko"))
1688                                 continue;
1689                         snprintf(dso_name, sizeof(dso_name), "[%.*s]",
1690                                  (int)(dot - dent->d_name), dent->d_name);
1691
1692                         strxfrchar(dso_name, '-', '_');
1693                         map = map_groups__find_by_name(mg, MAP__FUNCTION,
1694                                                        dso_name);
1695                         if (map == NULL)
1696                                 continue;
1697
1698                         snprintf(path, sizeof(path), "%s/%s",
1699                                  dir_name, dent->d_name);
1700
1701                         long_name = strdup(path);
1702                         if (long_name == NULL) {
1703                                 ret = -1;
1704                                 goto out;
1705                         }
1706                         dso__set_long_name(map->dso, long_name);
1707                         map->dso->lname_alloc = 1;
1708                         dso__kernel_module_get_build_id(map->dso, "");
1709                 }
1710         }
1711
1712 out:
1713         closedir(dir);
1714         return ret;
1715 }
1716
1717 static char *get_kernel_version(const char *root_dir)
1718 {
1719         char version[PATH_MAX];
1720         FILE *file;
1721         char *name, *tmp;
1722         const char *prefix = "Linux version ";
1723
1724         sprintf(version, "%s/proc/version", root_dir);
1725         file = fopen(version, "r");
1726         if (!file)
1727                 return NULL;
1728
1729         version[0] = '\0';
1730         tmp = fgets(version, sizeof(version), file);
1731         fclose(file);
1732
1733         name = strstr(version, prefix);
1734         if (!name)
1735                 return NULL;
1736         name += strlen(prefix);
1737         tmp = strchr(name, ' ');
1738         if (tmp)
1739                 *tmp = '\0';
1740
1741         return strdup(name);
1742 }
1743
1744 static int machine__set_modules_path(struct machine *machine)
1745 {
1746         char *version;
1747         char modules_path[PATH_MAX];
1748
1749         version = get_kernel_version(machine->root_dir);
1750         if (!version)
1751                 return -1;
1752
1753         snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s/kernel",
1754                  machine->root_dir, version);
1755         free(version);
1756
1757         return map_groups__set_modules_path_dir(&machine->kmaps, modules_path);
1758 }
1759
1760 /*
1761  * Constructor variant for modules (where we know from /proc/modules where
1762  * they are loaded) and for vmlinux, where only after we load all the
1763  * symbols we'll know where it starts and ends.
1764  */
1765 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type)
1766 {
1767         struct map *map = calloc(1, (sizeof(*map) +
1768                                      (dso->kernel ? sizeof(struct kmap) : 0)));
1769         if (map != NULL) {
1770                 /*
1771                  * ->end will be filled after we load all the symbols
1772                  */
1773                 map__init(map, type, start, 0, 0, dso);
1774         }
1775
1776         return map;
1777 }
1778
1779 struct map *machine__new_module(struct machine *machine, u64 start,
1780                                 const char *filename)
1781 {
1782         struct map *map;
1783         struct dso *dso = __dsos__findnew(&machine->kernel_dsos, filename);
1784
1785         if (dso == NULL)
1786                 return NULL;
1787
1788         map = map__new2(start, dso, MAP__FUNCTION);
1789         if (map == NULL)
1790                 return NULL;
1791
1792         if (machine__is_host(machine))
1793                 dso->symtab_type = SYMTAB__SYSTEM_PATH_KMODULE;
1794         else
1795                 dso->symtab_type = SYMTAB__GUEST_KMODULE;
1796         map_groups__insert(&machine->kmaps, map);
1797         return map;
1798 }
1799
1800 static int machine__create_modules(struct machine *machine)
1801 {
1802         char *line = NULL;
1803         size_t n;
1804         FILE *file;
1805         struct map *map;
1806         const char *modules;
1807         char path[PATH_MAX];
1808
1809         if (machine__is_default_guest(machine))
1810                 modules = symbol_conf.default_guest_modules;
1811         else {
1812                 sprintf(path, "%s/proc/modules", machine->root_dir);
1813                 modules = path;
1814         }
1815
1816         if (symbol__restricted_filename(path, "/proc/modules"))
1817                 return -1;
1818
1819         file = fopen(modules, "r");
1820         if (file == NULL)
1821                 return -1;
1822
1823         while (!feof(file)) {
1824                 char name[PATH_MAX];
1825                 u64 start;
1826                 char *sep;
1827                 int line_len;
1828
1829                 line_len = getline(&line, &n, file);
1830                 if (line_len < 0)
1831                         break;
1832
1833                 if (!line)
1834                         goto out_failure;
1835
1836                 line[--line_len] = '\0'; /* \n */
1837
1838                 sep = strrchr(line, 'x');
1839                 if (sep == NULL)
1840                         continue;
1841
1842                 hex2u64(sep + 1, &start);
1843
1844                 sep = strchr(line, ' ');
1845                 if (sep == NULL)
1846                         continue;
1847
1848                 *sep = '\0';
1849
1850                 snprintf(name, sizeof(name), "[%s]", line);
1851                 map = machine__new_module(machine, start, name);
1852                 if (map == NULL)
1853                         goto out_delete_line;
1854                 dso__kernel_module_get_build_id(map->dso, machine->root_dir);
1855         }
1856
1857         free(line);
1858         fclose(file);
1859
1860         return machine__set_modules_path(machine);
1861
1862 out_delete_line:
1863         free(line);
1864 out_failure:
1865         return -1;
1866 }
1867
1868 int dso__load_vmlinux(struct dso *dso, struct map *map,
1869                       const char *vmlinux, symbol_filter_t filter)
1870 {
1871         int err = -1, fd;
1872         char symfs_vmlinux[PATH_MAX];
1873
1874         snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s%s",
1875                  symbol_conf.symfs, vmlinux);
1876         fd = open(symfs_vmlinux, O_RDONLY);
1877         if (fd < 0)
1878                 return -1;
1879
1880         dso__set_long_name(dso, (char *)vmlinux);
1881         dso__set_loaded(dso, map->type);
1882         err = dso__load_sym(dso, map, symfs_vmlinux, fd, filter, 0, 0);
1883         close(fd);
1884
1885         if (err > 0)
1886                 pr_debug("Using %s for symbols\n", symfs_vmlinux);
1887
1888         return err;
1889 }
1890
1891 int dso__load_vmlinux_path(struct dso *dso, struct map *map,
1892                            symbol_filter_t filter)
1893 {
1894         int i, err = 0;
1895         char *filename;
1896
1897         pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1898                  vmlinux_path__nr_entries + 1);
1899
1900         filename = dso__build_id_filename(dso, NULL, 0);
1901         if (filename != NULL) {
1902                 err = dso__load_vmlinux(dso, map, filename, filter);
1903                 if (err > 0) {
1904                         dso__set_long_name(dso, filename);
1905                         goto out;
1906                 }
1907                 free(filename);
1908         }
1909
1910         for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1911                 err = dso__load_vmlinux(dso, map, vmlinux_path[i], filter);
1912                 if (err > 0) {
1913                         dso__set_long_name(dso, strdup(vmlinux_path[i]));
1914                         break;
1915                 }
1916         }
1917 out:
1918         return err;
1919 }
1920
1921 static int dso__load_kernel_sym(struct dso *dso, struct map *map,
1922                                 symbol_filter_t filter)
1923 {
1924         int err;
1925         const char *kallsyms_filename = NULL;
1926         char *kallsyms_allocated_filename = NULL;
1927         /*
1928          * Step 1: if the user specified a kallsyms or vmlinux filename, use
1929          * it and only it, reporting errors to the user if it cannot be used.
1930          *
1931          * For instance, try to analyse an ARM perf.data file _without_ a
1932          * build-id, or if the user specifies the wrong path to the right
1933          * vmlinux file, obviously we can't fallback to another vmlinux (a
1934          * x86_86 one, on the machine where analysis is being performed, say),
1935          * or worse, /proc/kallsyms.
1936          *
1937          * If the specified file _has_ a build-id and there is a build-id
1938          * section in the perf.data file, we will still do the expected
1939          * validation in dso__load_vmlinux and will bail out if they don't
1940          * match.
1941          */
1942         if (symbol_conf.kallsyms_name != NULL) {
1943                 kallsyms_filename = symbol_conf.kallsyms_name;
1944                 goto do_kallsyms;
1945         }
1946
1947         if (symbol_conf.vmlinux_name != NULL) {
1948                 err = dso__load_vmlinux(dso, map,
1949                                         symbol_conf.vmlinux_name, filter);
1950                 if (err > 0) {
1951                         dso__set_long_name(dso,
1952                                            strdup(symbol_conf.vmlinux_name));
1953                         goto out_fixup;
1954                 }
1955                 return err;
1956         }
1957
1958         if (vmlinux_path != NULL) {
1959                 err = dso__load_vmlinux_path(dso, map, filter);
1960                 if (err > 0)
1961                         goto out_fixup;
1962         }
1963
1964         /* do not try local files if a symfs was given */
1965         if (symbol_conf.symfs[0] != 0)
1966                 return -1;
1967
1968         /*
1969          * Say the kernel DSO was created when processing the build-id header table,
1970          * we have a build-id, so check if it is the same as the running kernel,
1971          * using it if it is.
1972          */
1973         if (dso->has_build_id) {
1974                 u8 kallsyms_build_id[BUILD_ID_SIZE];
1975                 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
1976
1977                 if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id,
1978                                          sizeof(kallsyms_build_id)) == 0) {
1979                         if (dso__build_id_equal(dso, kallsyms_build_id)) {
1980                                 kallsyms_filename = "/proc/kallsyms";
1981                                 goto do_kallsyms;
1982                         }
1983                 }
1984                 /*
1985                  * Now look if we have it on the build-id cache in
1986                  * $HOME/.debug/[kernel.kallsyms].
1987                  */
1988                 build_id__sprintf(dso->build_id, sizeof(dso->build_id),
1989                                   sbuild_id);
1990
1991                 if (asprintf(&kallsyms_allocated_filename,
1992                              "%s/.debug/[kernel.kallsyms]/%s",
1993                              getenv("HOME"), sbuild_id) == -1) {
1994                         pr_err("Not enough memory for kallsyms file lookup\n");
1995                         return -1;
1996                 }
1997
1998                 kallsyms_filename = kallsyms_allocated_filename;
1999
2000                 if (access(kallsyms_filename, F_OK)) {
2001                         pr_err("No kallsyms or vmlinux with build-id %s "
2002                                "was found\n", sbuild_id);
2003                         free(kallsyms_allocated_filename);
2004                         return -1;
2005                 }
2006         } else {
2007                 /*
2008                  * Last resort, if we don't have a build-id and couldn't find
2009                  * any vmlinux file, try the running kernel kallsyms table.
2010                  */
2011                 kallsyms_filename = "/proc/kallsyms";
2012         }
2013
2014 do_kallsyms:
2015         err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
2016         if (err > 0)
2017                 pr_debug("Using %s for symbols\n", kallsyms_filename);
2018         free(kallsyms_allocated_filename);
2019
2020         if (err > 0) {
2021 out_fixup:
2022                 if (kallsyms_filename != NULL)
2023                         dso__set_long_name(dso, strdup("[kernel.kallsyms]"));
2024                 map__fixup_start(map);
2025                 map__fixup_end(map);
2026         }
2027
2028         return err;
2029 }
2030
2031 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
2032                                       symbol_filter_t filter)
2033 {
2034         int err;
2035         const char *kallsyms_filename = NULL;
2036         struct machine *machine;
2037         char path[PATH_MAX];
2038
2039         if (!map->groups) {
2040                 pr_debug("Guest kernel map hasn't the point to groups\n");
2041                 return -1;
2042         }
2043         machine = map->groups->machine;
2044
2045         if (machine__is_default_guest(machine)) {
2046                 /*
2047                  * if the user specified a vmlinux filename, use it and only
2048                  * it, reporting errors to the user if it cannot be used.
2049                  * Or use file guest_kallsyms inputted by user on commandline
2050                  */
2051                 if (symbol_conf.default_guest_vmlinux_name != NULL) {
2052                         err = dso__load_vmlinux(dso, map,
2053                                 symbol_conf.default_guest_vmlinux_name, filter);
2054                         goto out_try_fixup;
2055                 }
2056
2057                 kallsyms_filename = symbol_conf.default_guest_kallsyms;
2058                 if (!kallsyms_filename)
2059                         return -1;
2060         } else {
2061                 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2062                 kallsyms_filename = path;
2063         }
2064
2065         err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
2066         if (err > 0)
2067                 pr_debug("Using %s for symbols\n", kallsyms_filename);
2068
2069 out_try_fixup:
2070         if (err > 0) {
2071                 if (kallsyms_filename != NULL) {
2072                         machine__mmap_name(machine, path, sizeof(path));
2073                         dso__set_long_name(dso, strdup(path));
2074                 }
2075                 map__fixup_start(map);
2076                 map__fixup_end(map);
2077         }
2078
2079         return err;
2080 }
2081
2082 static void dsos__add(struct list_head *head, struct dso *dso)
2083 {
2084         list_add_tail(&dso->node, head);
2085 }
2086
2087 static struct dso *dsos__find(struct list_head *head, const char *name)
2088 {
2089         struct dso *pos;
2090
2091         list_for_each_entry(pos, head, node)
2092                 if (strcmp(pos->long_name, name) == 0)
2093                         return pos;
2094         return NULL;
2095 }
2096
2097 struct dso *__dsos__findnew(struct list_head *head, const char *name)
2098 {
2099         struct dso *dso = dsos__find(head, name);
2100
2101         if (!dso) {
2102                 dso = dso__new(name);
2103                 if (dso != NULL) {
2104                         dsos__add(head, dso);
2105                         dso__set_basename(dso);
2106                 }
2107         }
2108
2109         return dso;
2110 }
2111
2112 size_t __dsos__fprintf(struct list_head *head, FILE *fp)
2113 {
2114         struct dso *pos;
2115         size_t ret = 0;
2116
2117         list_for_each_entry(pos, head, node) {
2118                 int i;
2119                 for (i = 0; i < MAP__NR_TYPES; ++i)
2120                         ret += dso__fprintf(pos, i, fp);
2121         }
2122
2123         return ret;
2124 }
2125
2126 size_t machines__fprintf_dsos(struct rb_root *machines, FILE *fp)
2127 {
2128         struct rb_node *nd;
2129         size_t ret = 0;
2130
2131         for (nd = rb_first(machines); nd; nd = rb_next(nd)) {
2132                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
2133                 ret += __dsos__fprintf(&pos->kernel_dsos, fp);
2134                 ret += __dsos__fprintf(&pos->user_dsos, fp);
2135         }
2136
2137         return ret;
2138 }
2139
2140 static size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp,
2141                                       bool with_hits)
2142 {
2143         struct dso *pos;
2144         size_t ret = 0;
2145
2146         list_for_each_entry(pos, head, node) {
2147                 if (with_hits && !pos->hit)
2148                         continue;
2149                 ret += dso__fprintf_buildid(pos, fp);
2150                 ret += fprintf(fp, " %s\n", pos->long_name);
2151         }
2152         return ret;
2153 }
2154
2155 size_t machine__fprintf_dsos_buildid(struct machine *machine, FILE *fp,
2156                                      bool with_hits)
2157 {
2158         return __dsos__fprintf_buildid(&machine->kernel_dsos, fp, with_hits) +
2159                __dsos__fprintf_buildid(&machine->user_dsos, fp, with_hits);
2160 }
2161
2162 size_t machines__fprintf_dsos_buildid(struct rb_root *machines,
2163                                       FILE *fp, bool with_hits)
2164 {
2165         struct rb_node *nd;
2166         size_t ret = 0;
2167
2168         for (nd = rb_first(machines); nd; nd = rb_next(nd)) {
2169                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
2170                 ret += machine__fprintf_dsos_buildid(pos, fp, with_hits);
2171         }
2172         return ret;
2173 }
2174
2175 static struct dso*
2176 dso__kernel_findnew(struct machine *machine, const char *name,
2177                     const char *short_name, int dso_type)
2178 {
2179         /*
2180          * The kernel dso could be created by build_id processing.
2181          */
2182         struct dso *dso = __dsos__findnew(&machine->kernel_dsos, name);
2183
2184         /*
2185          * We need to run this in all cases, since during the build_id
2186          * processing we had no idea this was the kernel dso.
2187          */
2188         if (dso != NULL) {
2189                 dso__set_short_name(dso, short_name);
2190                 dso->kernel = dso_type;
2191         }
2192
2193         return dso;
2194 }
2195
2196 void dso__read_running_kernel_build_id(struct dso *dso, struct machine *machine)
2197 {
2198         char path[PATH_MAX];
2199
2200         if (machine__is_default_guest(machine))
2201                 return;
2202         sprintf(path, "%s/sys/kernel/notes", machine->root_dir);
2203         if (sysfs__read_build_id(path, dso->build_id,
2204                                  sizeof(dso->build_id)) == 0)
2205                 dso->has_build_id = true;
2206 }
2207
2208 static struct dso *machine__get_kernel(struct machine *machine)
2209 {
2210         const char *vmlinux_name = NULL;
2211         struct dso *kernel;
2212
2213         if (machine__is_host(machine)) {
2214                 vmlinux_name = symbol_conf.vmlinux_name;
2215                 if (!vmlinux_name)
2216                         vmlinux_name = "[kernel.kallsyms]";
2217
2218                 kernel = dso__kernel_findnew(machine, vmlinux_name,
2219                                              "[kernel]",
2220                                              DSO_TYPE_KERNEL);
2221         } else {
2222                 char bf[PATH_MAX];
2223
2224                 if (machine__is_default_guest(machine))
2225                         vmlinux_name = symbol_conf.default_guest_vmlinux_name;
2226                 if (!vmlinux_name)
2227                         vmlinux_name = machine__mmap_name(machine, bf,
2228                                                           sizeof(bf));
2229
2230                 kernel = dso__kernel_findnew(machine, vmlinux_name,
2231                                              "[guest.kernel]",
2232                                              DSO_TYPE_GUEST_KERNEL);
2233         }
2234
2235         if (kernel != NULL && (!kernel->has_build_id))
2236                 dso__read_running_kernel_build_id(kernel, machine);
2237
2238         return kernel;
2239 }
2240
2241 struct process_args {
2242         u64 start;
2243 };
2244
2245 static int symbol__in_kernel(void *arg, const char *name,
2246                              char type __used, u64 start, u64 end __used)
2247 {
2248         struct process_args *args = arg;
2249
2250         if (strchr(name, '['))
2251                 return 0;
2252
2253         args->start = start;
2254         return 1;
2255 }
2256
2257 /* Figure out the start address of kernel map from /proc/kallsyms */
2258 static u64 machine__get_kernel_start_addr(struct machine *machine)
2259 {
2260         const char *filename;
2261         char path[PATH_MAX];
2262         struct process_args args;
2263
2264         if (machine__is_host(machine)) {
2265                 filename = "/proc/kallsyms";
2266         } else {
2267                 if (machine__is_default_guest(machine))
2268                         filename = (char *)symbol_conf.default_guest_kallsyms;
2269                 else {
2270                         sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2271                         filename = path;
2272                 }
2273         }
2274
2275         if (symbol__restricted_filename(filename, "/proc/kallsyms"))
2276                 return 0;
2277
2278         if (kallsyms__parse(filename, &args, symbol__in_kernel) <= 0)
2279                 return 0;
2280
2281         return args.start;
2282 }
2283
2284 int __machine__create_kernel_maps(struct machine *machine, struct dso *kernel)
2285 {
2286         enum map_type type;
2287         u64 start = machine__get_kernel_start_addr(machine);
2288
2289         for (type = 0; type < MAP__NR_TYPES; ++type) {
2290                 struct kmap *kmap;
2291
2292                 machine->vmlinux_maps[type] = map__new2(start, kernel, type);
2293                 if (machine->vmlinux_maps[type] == NULL)
2294                         return -1;
2295
2296                 machine->vmlinux_maps[type]->map_ip =
2297                         machine->vmlinux_maps[type]->unmap_ip =
2298                                 identity__map_ip;
2299                 kmap = map__kmap(machine->vmlinux_maps[type]);
2300                 kmap->kmaps = &machine->kmaps;
2301                 map_groups__insert(&machine->kmaps,
2302                                    machine->vmlinux_maps[type]);
2303         }
2304
2305         return 0;
2306 }
2307
2308 void machine__destroy_kernel_maps(struct machine *machine)
2309 {
2310         enum map_type type;
2311
2312         for (type = 0; type < MAP__NR_TYPES; ++type) {
2313                 struct kmap *kmap;
2314
2315                 if (machine->vmlinux_maps[type] == NULL)
2316                         continue;
2317
2318                 kmap = map__kmap(machine->vmlinux_maps[type]);
2319                 map_groups__remove(&machine->kmaps,
2320                                    machine->vmlinux_maps[type]);
2321                 if (kmap->ref_reloc_sym) {
2322                         /*
2323                          * ref_reloc_sym is shared among all maps, so free just
2324                          * on one of them.
2325                          */
2326                         if (type == MAP__FUNCTION) {
2327                                 free((char *)kmap->ref_reloc_sym->name);
2328                                 kmap->ref_reloc_sym->name = NULL;
2329                                 free(kmap->ref_reloc_sym);
2330                         }
2331                         kmap->ref_reloc_sym = NULL;
2332                 }
2333
2334                 map__delete(machine->vmlinux_maps[type]);
2335                 machine->vmlinux_maps[type] = NULL;
2336         }
2337 }
2338
2339 int machine__create_kernel_maps(struct machine *machine)
2340 {
2341         struct dso *kernel = machine__get_kernel(machine);
2342
2343         if (kernel == NULL ||
2344             __machine__create_kernel_maps(machine, kernel) < 0)
2345                 return -1;
2346
2347         if (symbol_conf.use_modules && machine__create_modules(machine) < 0)
2348                 pr_debug("Problems creating module maps, continuing anyway...\n");
2349         /*
2350          * Now that we have all the maps created, just set the ->end of them:
2351          */
2352         map_groups__fixup_end(&machine->kmaps);
2353         return 0;
2354 }
2355
2356 static void vmlinux_path__exit(void)
2357 {
2358         while (--vmlinux_path__nr_entries >= 0) {
2359                 free(vmlinux_path[vmlinux_path__nr_entries]);
2360                 vmlinux_path[vmlinux_path__nr_entries] = NULL;
2361         }
2362
2363         free(vmlinux_path);
2364         vmlinux_path = NULL;
2365 }
2366
2367 static int vmlinux_path__init(void)
2368 {
2369         struct utsname uts;
2370         char bf[PATH_MAX];
2371
2372         vmlinux_path = malloc(sizeof(char *) * 5);
2373         if (vmlinux_path == NULL)
2374                 return -1;
2375
2376         vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
2377         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2378                 goto out_fail;
2379         ++vmlinux_path__nr_entries;
2380         vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
2381         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2382                 goto out_fail;
2383         ++vmlinux_path__nr_entries;
2384
2385         /* only try running kernel version if no symfs was given */
2386         if (symbol_conf.symfs[0] != 0)
2387                 return 0;
2388
2389         if (uname(&uts) < 0)
2390                 return -1;
2391
2392         snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
2393         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2394         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2395                 goto out_fail;
2396         ++vmlinux_path__nr_entries;
2397         snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release);
2398         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2399         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2400                 goto out_fail;
2401         ++vmlinux_path__nr_entries;
2402         snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
2403                  uts.release);
2404         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2405         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2406                 goto out_fail;
2407         ++vmlinux_path__nr_entries;
2408
2409         return 0;
2410
2411 out_fail:
2412         vmlinux_path__exit();
2413         return -1;
2414 }
2415
2416 size_t machine__fprintf_vmlinux_path(struct machine *machine, FILE *fp)
2417 {
2418         int i;
2419         size_t printed = 0;
2420         struct dso *kdso = machine->vmlinux_maps[MAP__FUNCTION]->dso;
2421
2422         if (kdso->has_build_id) {
2423                 char filename[PATH_MAX];
2424                 if (dso__build_id_filename(kdso, filename, sizeof(filename)))
2425                         printed += fprintf(fp, "[0] %s\n", filename);
2426         }
2427
2428         for (i = 0; i < vmlinux_path__nr_entries; ++i)
2429                 printed += fprintf(fp, "[%d] %s\n",
2430                                    i + kdso->has_build_id, vmlinux_path[i]);
2431
2432         return printed;
2433 }
2434
2435 static int setup_list(struct strlist **list, const char *list_str,
2436                       const char *list_name)
2437 {
2438         if (list_str == NULL)
2439                 return 0;
2440
2441         *list = strlist__new(true, list_str);
2442         if (!*list) {
2443                 pr_err("problems parsing %s list\n", list_name);
2444                 return -1;
2445         }
2446         return 0;
2447 }
2448
2449 static bool symbol__read_kptr_restrict(void)
2450 {
2451         bool value = false;
2452
2453         if (geteuid() != 0) {
2454                 FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
2455                 if (fp != NULL) {
2456                         char line[8];
2457
2458                         if (fgets(line, sizeof(line), fp) != NULL)
2459                                 value = atoi(line) != 0;
2460
2461                         fclose(fp);
2462                 }
2463         }
2464
2465         return value;
2466 }
2467
2468 int symbol__init(void)
2469 {
2470         const char *symfs;
2471
2472         if (symbol_conf.initialized)
2473                 return 0;
2474
2475         symbol_conf.priv_size = ALIGN(symbol_conf.priv_size, sizeof(u64));
2476
2477         elf_version(EV_CURRENT);
2478         if (symbol_conf.sort_by_name)
2479                 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
2480                                           sizeof(struct symbol));
2481
2482         if (symbol_conf.try_vmlinux_path && vmlinux_path__init() < 0)
2483                 return -1;
2484
2485         if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
2486                 pr_err("'.' is the only non valid --field-separator argument\n");
2487                 return -1;
2488         }
2489
2490         if (setup_list(&symbol_conf.dso_list,
2491                        symbol_conf.dso_list_str, "dso") < 0)
2492                 return -1;
2493
2494         if (setup_list(&symbol_conf.comm_list,
2495                        symbol_conf.comm_list_str, "comm") < 0)
2496                 goto out_free_dso_list;
2497
2498         if (setup_list(&symbol_conf.sym_list,
2499                        symbol_conf.sym_list_str, "symbol") < 0)
2500                 goto out_free_comm_list;
2501
2502         /*
2503          * A path to symbols of "/" is identical to ""
2504          * reset here for simplicity.
2505          */
2506         symfs = realpath(symbol_conf.symfs, NULL);
2507         if (symfs == NULL)
2508                 symfs = symbol_conf.symfs;
2509         if (strcmp(symfs, "/") == 0)
2510                 symbol_conf.symfs = "";
2511         if (symfs != symbol_conf.symfs)
2512                 free((void *)symfs);
2513
2514         symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
2515
2516         symbol_conf.initialized = true;
2517         return 0;
2518
2519 out_free_dso_list:
2520         strlist__delete(symbol_conf.dso_list);
2521 out_free_comm_list:
2522         strlist__delete(symbol_conf.comm_list);
2523         return -1;
2524 }
2525
2526 void symbol__exit(void)
2527 {
2528         if (!symbol_conf.initialized)
2529                 return;
2530         strlist__delete(symbol_conf.sym_list);
2531         strlist__delete(symbol_conf.dso_list);
2532         strlist__delete(symbol_conf.comm_list);
2533         vmlinux_path__exit();
2534         symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2535         symbol_conf.initialized = false;
2536 }
2537
2538 int machines__create_kernel_maps(struct rb_root *machines, pid_t pid)
2539 {
2540         struct machine *machine = machines__findnew(machines, pid);
2541
2542         if (machine == NULL)
2543                 return -1;
2544
2545         return machine__create_kernel_maps(machine);
2546 }
2547
2548 static int hex(char ch)
2549 {
2550         if ((ch >= '0') && (ch <= '9'))
2551                 return ch - '0';
2552         if ((ch >= 'a') && (ch <= 'f'))
2553                 return ch - 'a' + 10;
2554         if ((ch >= 'A') && (ch <= 'F'))
2555                 return ch - 'A' + 10;
2556         return -1;
2557 }
2558
2559 /*
2560  * While we find nice hex chars, build a long_val.
2561  * Return number of chars processed.
2562  */
2563 int hex2u64(const char *ptr, u64 *long_val)
2564 {
2565         const char *p = ptr;
2566         *long_val = 0;
2567
2568         while (*p) {
2569                 const int hex_val = hex(*p);
2570
2571                 if (hex_val < 0)
2572                         break;
2573
2574                 *long_val = (*long_val << 4) | hex_val;
2575                 p++;
2576         }
2577
2578         return p - ptr;
2579 }
2580
2581 char *strxfrchar(char *s, char from, char to)
2582 {
2583         char *p = s;
2584
2585         while ((p = strchr(p, from)) != NULL)
2586                 *p++ = to;
2587
2588         return s;
2589 }
2590
2591 int machines__create_guest_kernel_maps(struct rb_root *machines)
2592 {
2593         int ret = 0;
2594         struct dirent **namelist = NULL;
2595         int i, items = 0;
2596         char path[PATH_MAX];
2597         pid_t pid;
2598
2599         if (symbol_conf.default_guest_vmlinux_name ||
2600             symbol_conf.default_guest_modules ||
2601             symbol_conf.default_guest_kallsyms) {
2602                 machines__create_kernel_maps(machines, DEFAULT_GUEST_KERNEL_ID);
2603         }
2604
2605         if (symbol_conf.guestmount) {
2606                 items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL);
2607                 if (items <= 0)
2608                         return -ENOENT;
2609                 for (i = 0; i < items; i++) {
2610                         if (!isdigit(namelist[i]->d_name[0])) {
2611                                 /* Filter out . and .. */
2612                                 continue;
2613                         }
2614                         pid = atoi(namelist[i]->d_name);
2615                         sprintf(path, "%s/%s/proc/kallsyms",
2616                                 symbol_conf.guestmount,
2617                                 namelist[i]->d_name);
2618                         ret = access(path, R_OK);
2619                         if (ret) {
2620                                 pr_debug("Can't access file %s\n", path);
2621                                 goto failure;
2622                         }
2623                         machines__create_kernel_maps(machines, pid);
2624                 }
2625 failure:
2626                 free(namelist);
2627         }
2628
2629         return ret;
2630 }
2631
2632 void machines__destroy_guest_kernel_maps(struct rb_root *machines)
2633 {
2634         struct rb_node *next = rb_first(machines);
2635
2636         while (next) {
2637                 struct machine *pos = rb_entry(next, struct machine, rb_node);
2638
2639                 next = rb_next(&pos->rb_node);
2640                 rb_erase(&pos->rb_node, machines);
2641                 machine__delete(pos);
2642         }
2643 }
2644
2645 int machine__load_kallsyms(struct machine *machine, const char *filename,
2646                            enum map_type type, symbol_filter_t filter)
2647 {
2648         struct map *map = machine->vmlinux_maps[type];
2649         int ret = dso__load_kallsyms(map->dso, filename, map, filter);
2650
2651         if (ret > 0) {
2652                 dso__set_loaded(map->dso, type);
2653                 /*
2654                  * Since /proc/kallsyms will have multiple sessions for the
2655                  * kernel, with modules between them, fixup the end of all
2656                  * sections.
2657                  */
2658                 __map_groups__fixup_end(&machine->kmaps, type);
2659         }
2660
2661         return ret;
2662 }
2663
2664 int machine__load_vmlinux_path(struct machine *machine, enum map_type type,
2665                                symbol_filter_t filter)
2666 {
2667         struct map *map = machine->vmlinux_maps[type];
2668         int ret = dso__load_vmlinux_path(map->dso, map, filter);
2669
2670         if (ret > 0) {
2671                 dso__set_loaded(map->dso, type);
2672                 map__reloc_vmlinux(map);
2673         }
2674
2675         return ret;
2676 }