bb5d32f38af2f4fbde3eda4bf71820c25fb79302
[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         u64 prev_start = 0;
442         char prev_symbol_type = 0;
443         char *prev_symbol_name;
444         FILE *file = fopen(filename, "r");
445
446         if (file == NULL)
447                 goto out_failure;
448
449         prev_symbol_name = malloc(KSYM_NAME_LEN);
450         if (prev_symbol_name == NULL)
451                 goto out_close;
452
453         err = 0;
454
455         while (!feof(file)) {
456                 u64 start;
457                 int line_len, len;
458                 char symbol_type;
459                 char *symbol_name;
460
461                 line_len = getline(&line, &n, file);
462                 if (line_len < 0 || !line)
463                         break;
464
465                 line[--line_len] = '\0'; /* \n */
466
467                 len = hex2u64(line, &start);
468
469                 len++;
470                 if (len + 2 >= line_len)
471                         continue;
472
473                 symbol_type = toupper(line[len]);
474                 len += 2;
475                 symbol_name = line + len;
476                 len = line_len - len;
477
478                 if (len >= KSYM_NAME_LEN) {
479                         err = -1;
480                         break;
481                 }
482
483                 if (prev_symbol_type) {
484                         u64 end = start;
485                         if (end != prev_start)
486                                 --end;
487                         err = process_symbol(arg, prev_symbol_name,
488                                              prev_symbol_type, prev_start, end);
489                         if (err)
490                                 break;
491                 }
492
493                 memcpy(prev_symbol_name, symbol_name, len + 1);
494                 prev_symbol_type = symbol_type;
495                 prev_start = start;
496         }
497
498         free(prev_symbol_name);
499         free(line);
500 out_close:
501         fclose(file);
502         return err;
503
504 out_failure:
505         return -1;
506 }
507
508 struct process_kallsyms_args {
509         struct map *map;
510         struct dso *dso;
511 };
512
513 static u8 kallsyms2elf_type(char type)
514 {
515         if (type == 'W')
516                 return STB_WEAK;
517
518         return isupper(type) ? STB_GLOBAL : STB_LOCAL;
519 }
520
521 static int map__process_kallsym_symbol(void *arg, const char *name,
522                                        char type, u64 start, u64 end)
523 {
524         struct symbol *sym;
525         struct process_kallsyms_args *a = arg;
526         struct rb_root *root = &a->dso->symbols[a->map->type];
527
528         if (!symbol_type__is_a(type, a->map->type))
529                 return 0;
530
531         sym = symbol__new(start, end - start + 1,
532                           kallsyms2elf_type(type), name);
533         if (sym == NULL)
534                 return -ENOMEM;
535         /*
536          * We will pass the symbols to the filter later, in
537          * map__split_kallsyms, when we have split the maps per module
538          */
539         symbols__insert(root, sym);
540
541         return 0;
542 }
543
544 /*
545  * Loads the function entries in /proc/kallsyms into kernel_map->dso,
546  * so that we can in the next step set the symbol ->end address and then
547  * call kernel_maps__split_kallsyms.
548  */
549 static int dso__load_all_kallsyms(struct dso *dso, const char *filename,
550                                   struct map *map)
551 {
552         struct process_kallsyms_args args = { .map = map, .dso = dso, };
553         return kallsyms__parse(filename, &args, map__process_kallsym_symbol);
554 }
555
556 /*
557  * Split the symbols into maps, making sure there are no overlaps, i.e. the
558  * kernel range is broken in several maps, named [kernel].N, as we don't have
559  * the original ELF section names vmlinux have.
560  */
561 static int dso__split_kallsyms(struct dso *dso, struct map *map,
562                                symbol_filter_t filter)
563 {
564         struct map_groups *kmaps = map__kmap(map)->kmaps;
565         struct machine *machine = kmaps->machine;
566         struct map *curr_map = map;
567         struct symbol *pos;
568         int count = 0, moved = 0;       
569         struct rb_root *root = &dso->symbols[map->type];
570         struct rb_node *next = rb_first(root);
571         int kernel_range = 0;
572
573         while (next) {
574                 char *module;
575
576                 pos = rb_entry(next, struct symbol, rb_node);
577                 next = rb_next(&pos->rb_node);
578
579                 module = strchr(pos->name, '\t');
580                 if (module) {
581                         if (!symbol_conf.use_modules)
582                                 goto discard_symbol;
583
584                         *module++ = '\0';
585
586                         if (strcmp(curr_map->dso->short_name, module)) {
587                                 if (curr_map != map &&
588                                     dso->kernel == DSO_TYPE_GUEST_KERNEL &&
589                                     machine__is_default_guest(machine)) {
590                                         /*
591                                          * We assume all symbols of a module are
592                                          * continuous in * kallsyms, so curr_map
593                                          * points to a module and all its
594                                          * symbols are in its kmap. Mark it as
595                                          * loaded.
596                                          */
597                                         dso__set_loaded(curr_map->dso,
598                                                         curr_map->type);
599                                 }
600
601                                 curr_map = map_groups__find_by_name(kmaps,
602                                                         map->type, module);
603                                 if (curr_map == NULL) {
604                                         pr_debug("%s/proc/{kallsyms,modules} "
605                                                  "inconsistency while looking "
606                                                  "for \"%s\" module!\n",
607                                                  machine->root_dir, module);
608                                         curr_map = map;
609                                         goto discard_symbol;
610                                 }
611
612                                 if (curr_map->dso->loaded &&
613                                     !machine__is_default_guest(machine))
614                                         goto discard_symbol;
615                         }
616                         /*
617                          * So that we look just like we get from .ko files,
618                          * i.e. not prelinked, relative to map->start.
619                          */
620                         pos->start = curr_map->map_ip(curr_map, pos->start);
621                         pos->end   = curr_map->map_ip(curr_map, pos->end);
622                 } else if (curr_map != map) {
623                         char dso_name[PATH_MAX];
624                         struct dso *ndso;
625
626                         if (count == 0) {
627                                 curr_map = map;
628                                 goto filter_symbol;
629                         }
630
631                         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
632                                 snprintf(dso_name, sizeof(dso_name),
633                                         "[guest.kernel].%d",
634                                         kernel_range++);
635                         else
636                                 snprintf(dso_name, sizeof(dso_name),
637                                         "[kernel].%d",
638                                         kernel_range++);
639
640                         ndso = dso__new(dso_name);
641                         if (ndso == NULL)
642                                 return -1;
643
644                         ndso->kernel = dso->kernel;
645
646                         curr_map = map__new2(pos->start, ndso, map->type);
647                         if (curr_map == NULL) {
648                                 dso__delete(ndso);
649                                 return -1;
650                         }
651
652                         curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
653                         map_groups__insert(kmaps, curr_map);
654                         ++kernel_range;
655                 }
656 filter_symbol:
657                 if (filter && filter(curr_map, pos)) {
658 discard_symbol:         rb_erase(&pos->rb_node, root);
659                         symbol__delete(pos);
660                 } else {
661                         if (curr_map != map) {
662                                 rb_erase(&pos->rb_node, root);
663                                 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
664                                 ++moved;
665                         } else
666                                 ++count;
667                 }
668         }
669
670         if (curr_map != map &&
671             dso->kernel == DSO_TYPE_GUEST_KERNEL &&
672             machine__is_default_guest(kmaps->machine)) {
673                 dso__set_loaded(curr_map->dso, curr_map->type);
674         }
675
676         return count + moved;
677 }
678
679 static bool symbol__restricted_filename(const char *filename,
680                                         const char *restricted_filename)
681 {
682         bool restricted = false;
683
684         if (symbol_conf.kptr_restrict) {
685                 char *r = realpath(filename, NULL);
686
687                 if (r != NULL) {
688                         restricted = strcmp(r, restricted_filename) == 0;
689                         free(r);
690                         return restricted;
691                 }
692         }
693
694         return restricted;
695 }
696
697 int dso__load_kallsyms(struct dso *dso, const char *filename,
698                        struct map *map, symbol_filter_t filter)
699 {
700         if (symbol__restricted_filename(filename, "/proc/kallsyms"))
701                 return -1;
702
703         if (dso__load_all_kallsyms(dso, filename, map) < 0)
704                 return -1;
705
706         if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
707                 dso->symtab_type = SYMTAB__GUEST_KALLSYMS;
708         else
709                 dso->symtab_type = SYMTAB__KALLSYMS;
710
711         return dso__split_kallsyms(dso, map, filter);
712 }
713
714 static int dso__load_perf_map(struct dso *dso, struct map *map,
715                               symbol_filter_t filter)
716 {
717         char *line = NULL;
718         size_t n;
719         FILE *file;
720         int nr_syms = 0;
721
722         file = fopen(dso->long_name, "r");
723         if (file == NULL)
724                 goto out_failure;
725
726         while (!feof(file)) {
727                 u64 start, size;
728                 struct symbol *sym;
729                 int line_len, len;
730
731                 line_len = getline(&line, &n, file);
732                 if (line_len < 0)
733                         break;
734
735                 if (!line)
736                         goto out_failure;
737
738                 line[--line_len] = '\0'; /* \n */
739
740                 len = hex2u64(line, &start);
741
742                 len++;
743                 if (len + 2 >= line_len)
744                         continue;
745
746                 len += hex2u64(line + len, &size);
747
748                 len++;
749                 if (len + 2 >= line_len)
750                         continue;
751
752                 sym = symbol__new(start, size, STB_GLOBAL, line + len);
753
754                 if (sym == NULL)
755                         goto out_delete_line;
756
757                 if (filter && filter(map, sym))
758                         symbol__delete(sym);
759                 else {
760                         symbols__insert(&dso->symbols[map->type], sym);
761                         nr_syms++;
762                 }
763         }
764
765         free(line);
766         fclose(file);
767
768         return nr_syms;
769
770 out_delete_line:
771         free(line);
772 out_failure:
773         return -1;
774 }
775
776 /**
777  * elf_symtab__for_each_symbol - iterate thru all the symbols
778  *
779  * @syms: struct elf_symtab instance to iterate
780  * @idx: uint32_t idx
781  * @sym: GElf_Sym iterator
782  */
783 #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
784         for (idx = 0, gelf_getsym(syms, idx, &sym);\
785              idx < nr_syms; \
786              idx++, gelf_getsym(syms, idx, &sym))
787
788 static inline uint8_t elf_sym__type(const GElf_Sym *sym)
789 {
790         return GELF_ST_TYPE(sym->st_info);
791 }
792
793 static inline int elf_sym__is_function(const GElf_Sym *sym)
794 {
795         return elf_sym__type(sym) == STT_FUNC &&
796                sym->st_name != 0 &&
797                sym->st_shndx != SHN_UNDEF;
798 }
799
800 static inline bool elf_sym__is_object(const GElf_Sym *sym)
801 {
802         return elf_sym__type(sym) == STT_OBJECT &&
803                 sym->st_name != 0 &&
804                 sym->st_shndx != SHN_UNDEF;
805 }
806
807 static inline int elf_sym__is_label(const GElf_Sym *sym)
808 {
809         return elf_sym__type(sym) == STT_NOTYPE &&
810                 sym->st_name != 0 &&
811                 sym->st_shndx != SHN_UNDEF &&
812                 sym->st_shndx != SHN_ABS;
813 }
814
815 static inline const char *elf_sec__name(const GElf_Shdr *shdr,
816                                         const Elf_Data *secstrs)
817 {
818         return secstrs->d_buf + shdr->sh_name;
819 }
820
821 static inline int elf_sec__is_text(const GElf_Shdr *shdr,
822                                         const Elf_Data *secstrs)
823 {
824         return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
825 }
826
827 static inline bool elf_sec__is_data(const GElf_Shdr *shdr,
828                                     const Elf_Data *secstrs)
829 {
830         return strstr(elf_sec__name(shdr, secstrs), "data") != NULL;
831 }
832
833 static inline const char *elf_sym__name(const GElf_Sym *sym,
834                                         const Elf_Data *symstrs)
835 {
836         return symstrs->d_buf + sym->st_name;
837 }
838
839 static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
840                                     GElf_Shdr *shp, const char *name,
841                                     size_t *idx)
842 {
843         Elf_Scn *sec = NULL;
844         size_t cnt = 1;
845
846         while ((sec = elf_nextscn(elf, sec)) != NULL) {
847                 char *str;
848
849                 gelf_getshdr(sec, shp);
850                 str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
851                 if (!strcmp(name, str)) {
852                         if (idx)
853                                 *idx = cnt;
854                         break;
855                 }
856                 ++cnt;
857         }
858
859         return sec;
860 }
861
862 #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
863         for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \
864              idx < nr_entries; \
865              ++idx, pos = gelf_getrel(reldata, idx, &pos_mem))
866
867 #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \
868         for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \
869              idx < nr_entries; \
870              ++idx, pos = gelf_getrela(reldata, idx, &pos_mem))
871
872 /*
873  * We need to check if we have a .dynsym, so that we can handle the
874  * .plt, synthesizing its symbols, that aren't on the symtabs (be it
875  * .dynsym or .symtab).
876  * And always look at the original dso, not at debuginfo packages, that
877  * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
878  */
879 static int dso__synthesize_plt_symbols(struct  dso *dso, struct map *map,
880                                        symbol_filter_t filter)
881 {
882         uint32_t nr_rel_entries, idx;
883         GElf_Sym sym;
884         u64 plt_offset;
885         GElf_Shdr shdr_plt;
886         struct symbol *f;
887         GElf_Shdr shdr_rel_plt, shdr_dynsym;
888         Elf_Data *reldata, *syms, *symstrs;
889         Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym;
890         size_t dynsym_idx;
891         GElf_Ehdr ehdr;
892         char sympltname[1024];
893         Elf *elf;
894         int nr = 0, symidx, fd, err = 0;
895         char name[PATH_MAX];
896
897         snprintf(name, sizeof(name), "%s%s",
898                  symbol_conf.symfs, dso->long_name);
899         fd = open(name, O_RDONLY);
900         if (fd < 0)
901                 goto out;
902
903         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
904         if (elf == NULL)
905                 goto out_close;
906
907         if (gelf_getehdr(elf, &ehdr) == NULL)
908                 goto out_elf_end;
909
910         scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym,
911                                          ".dynsym", &dynsym_idx);
912         if (scn_dynsym == NULL)
913                 goto out_elf_end;
914
915         scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
916                                           ".rela.plt", NULL);
917         if (scn_plt_rel == NULL) {
918                 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
919                                                   ".rel.plt", NULL);
920                 if (scn_plt_rel == NULL)
921                         goto out_elf_end;
922         }
923
924         err = -1;
925
926         if (shdr_rel_plt.sh_link != dynsym_idx)
927                 goto out_elf_end;
928
929         if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL)
930                 goto out_elf_end;
931
932         /*
933          * Fetch the relocation section to find the idxes to the GOT
934          * and the symbols in the .dynsym they refer to.
935          */
936         reldata = elf_getdata(scn_plt_rel, NULL);
937         if (reldata == NULL)
938                 goto out_elf_end;
939
940         syms = elf_getdata(scn_dynsym, NULL);
941         if (syms == NULL)
942                 goto out_elf_end;
943
944         scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link);
945         if (scn_symstrs == NULL)
946                 goto out_elf_end;
947
948         symstrs = elf_getdata(scn_symstrs, NULL);
949         if (symstrs == NULL)
950                 goto out_elf_end;
951
952         nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize;
953         plt_offset = shdr_plt.sh_offset;
954
955         if (shdr_rel_plt.sh_type == SHT_RELA) {
956                 GElf_Rela pos_mem, *pos;
957
958                 elf_section__for_each_rela(reldata, pos, pos_mem, idx,
959                                            nr_rel_entries) {
960                         symidx = GELF_R_SYM(pos->r_info);
961                         plt_offset += shdr_plt.sh_entsize;
962                         gelf_getsym(syms, symidx, &sym);
963                         snprintf(sympltname, sizeof(sympltname),
964                                  "%s@plt", elf_sym__name(&sym, symstrs));
965
966                         f = symbol__new(plt_offset, shdr_plt.sh_entsize,
967                                         STB_GLOBAL, sympltname);
968                         if (!f)
969                                 goto out_elf_end;
970
971                         if (filter && filter(map, f))
972                                 symbol__delete(f);
973                         else {
974                                 symbols__insert(&dso->symbols[map->type], f);
975                                 ++nr;
976                         }
977                 }
978         } else if (shdr_rel_plt.sh_type == SHT_REL) {
979                 GElf_Rel pos_mem, *pos;
980                 elf_section__for_each_rel(reldata, pos, pos_mem, idx,
981                                           nr_rel_entries) {
982                         symidx = GELF_R_SYM(pos->r_info);
983                         plt_offset += shdr_plt.sh_entsize;
984                         gelf_getsym(syms, symidx, &sym);
985                         snprintf(sympltname, sizeof(sympltname),
986                                  "%s@plt", elf_sym__name(&sym, symstrs));
987
988                         f = symbol__new(plt_offset, shdr_plt.sh_entsize,
989                                         STB_GLOBAL, sympltname);
990                         if (!f)
991                                 goto out_elf_end;
992
993                         if (filter && filter(map, f))
994                                 symbol__delete(f);
995                         else {
996                                 symbols__insert(&dso->symbols[map->type], f);
997                                 ++nr;
998                         }
999                 }
1000         }
1001
1002         err = 0;
1003 out_elf_end:
1004         elf_end(elf);
1005 out_close:
1006         close(fd);
1007
1008         if (err == 0)
1009                 return nr;
1010 out:
1011         pr_debug("%s: problems reading %s PLT info.\n",
1012                  __func__, dso->long_name);
1013         return 0;
1014 }
1015
1016 static bool elf_sym__is_a(GElf_Sym *sym, enum map_type type)
1017 {
1018         switch (type) {
1019         case MAP__FUNCTION:
1020                 return elf_sym__is_function(sym);
1021         case MAP__VARIABLE:
1022                 return elf_sym__is_object(sym);
1023         default:
1024                 return false;
1025         }
1026 }
1027
1028 static bool elf_sec__is_a(GElf_Shdr *shdr, Elf_Data *secstrs,
1029                           enum map_type type)
1030 {
1031         switch (type) {
1032         case MAP__FUNCTION:
1033                 return elf_sec__is_text(shdr, secstrs);
1034         case MAP__VARIABLE:
1035                 return elf_sec__is_data(shdr, secstrs);
1036         default:
1037                 return false;
1038         }
1039 }
1040
1041 static size_t elf_addr_to_index(Elf *elf, GElf_Addr addr)
1042 {
1043         Elf_Scn *sec = NULL;
1044         GElf_Shdr shdr;
1045         size_t cnt = 1;
1046
1047         while ((sec = elf_nextscn(elf, sec)) != NULL) {
1048                 gelf_getshdr(sec, &shdr);
1049
1050                 if ((addr >= shdr.sh_addr) &&
1051                     (addr < (shdr.sh_addr + shdr.sh_size)))
1052                         return cnt;
1053
1054                 ++cnt;
1055         }
1056
1057         return -1;
1058 }
1059
1060 static int dso__load_sym(struct dso *dso, struct map *map, const char *name,
1061                          int fd, symbol_filter_t filter, int kmodule,
1062                          int want_symtab)
1063 {
1064         struct kmap *kmap = dso->kernel ? map__kmap(map) : NULL;
1065         struct map *curr_map = map;
1066         struct dso *curr_dso = dso;
1067         Elf_Data *symstrs, *secstrs;
1068         uint32_t nr_syms;
1069         int err = -1;
1070         uint32_t idx;
1071         GElf_Ehdr ehdr;
1072         GElf_Shdr shdr, opdshdr;
1073         Elf_Data *syms, *opddata = NULL;
1074         GElf_Sym sym;
1075         Elf_Scn *sec, *sec_strndx, *opdsec;
1076         Elf *elf;
1077         int nr = 0;
1078         size_t opdidx = 0;
1079
1080         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1081         if (elf == NULL) {
1082                 pr_debug("%s: cannot read %s ELF file.\n", __func__, name);
1083                 goto out_close;
1084         }
1085
1086         if (gelf_getehdr(elf, &ehdr) == NULL) {
1087                 pr_debug("%s: cannot get elf header.\n", __func__);
1088                 goto out_elf_end;
1089         }
1090
1091         /* Always reject images with a mismatched build-id: */
1092         if (dso->has_build_id) {
1093                 u8 build_id[BUILD_ID_SIZE];
1094
1095                 if (elf_read_build_id(elf, build_id,
1096                                       BUILD_ID_SIZE) != BUILD_ID_SIZE)
1097                         goto out_elf_end;
1098
1099                 if (!dso__build_id_equal(dso, build_id))
1100                         goto out_elf_end;
1101         }
1102
1103         sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL);
1104         if (sec == NULL) {
1105                 if (want_symtab)
1106                         goto out_elf_end;
1107
1108                 sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL);
1109                 if (sec == NULL)
1110                         goto out_elf_end;
1111         }
1112
1113         opdsec = elf_section_by_name(elf, &ehdr, &opdshdr, ".opd", &opdidx);
1114         if (opdshdr.sh_type != SHT_PROGBITS)
1115                 opdsec = NULL;
1116         if (opdsec)
1117                 opddata = elf_rawdata(opdsec, NULL);
1118
1119         syms = elf_getdata(sec, NULL);
1120         if (syms == NULL)
1121                 goto out_elf_end;
1122
1123         sec = elf_getscn(elf, shdr.sh_link);
1124         if (sec == NULL)
1125                 goto out_elf_end;
1126
1127         symstrs = elf_getdata(sec, NULL);
1128         if (symstrs == NULL)
1129                 goto out_elf_end;
1130
1131         sec_strndx = elf_getscn(elf, ehdr.e_shstrndx);
1132         if (sec_strndx == NULL)
1133                 goto out_elf_end;
1134
1135         secstrs = elf_getdata(sec_strndx, NULL);
1136         if (secstrs == NULL)
1137                 goto out_elf_end;
1138
1139         nr_syms = shdr.sh_size / shdr.sh_entsize;
1140
1141         memset(&sym, 0, sizeof(sym));
1142         if (dso->kernel == DSO_TYPE_USER) {
1143                 dso->adjust_symbols = (ehdr.e_type == ET_EXEC ||
1144                                 elf_section_by_name(elf, &ehdr, &shdr,
1145                                                      ".gnu.prelink_undo",
1146                                                      NULL) != NULL);
1147         } else {
1148                 dso->adjust_symbols = 0;
1149         }
1150         elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
1151                 struct symbol *f;
1152                 const char *elf_name = elf_sym__name(&sym, symstrs);
1153                 char *demangled = NULL;
1154                 int is_label = elf_sym__is_label(&sym);
1155                 const char *section_name;
1156
1157                 if (kmap && kmap->ref_reloc_sym && kmap->ref_reloc_sym->name &&
1158                     strcmp(elf_name, kmap->ref_reloc_sym->name) == 0)
1159                         kmap->ref_reloc_sym->unrelocated_addr = sym.st_value;
1160
1161                 if (!is_label && !elf_sym__is_a(&sym, map->type))
1162                         continue;
1163
1164                 /* Reject ARM ELF "mapping symbols": these aren't unique and
1165                  * don't identify functions, so will confuse the profile
1166                  * output: */
1167                 if (ehdr.e_machine == EM_ARM) {
1168                         if (!strcmp(elf_name, "$a") ||
1169                             !strcmp(elf_name, "$d") ||
1170                             !strcmp(elf_name, "$t"))
1171                                 continue;
1172                 }
1173
1174                 if (opdsec && sym.st_shndx == opdidx) {
1175                         u32 offset = sym.st_value - opdshdr.sh_addr;
1176                         u64 *opd = opddata->d_buf + offset;
1177                         sym.st_value = *opd;
1178                         sym.st_shndx = elf_addr_to_index(elf, sym.st_value);
1179                 }
1180
1181                 sec = elf_getscn(elf, sym.st_shndx);
1182                 if (!sec)
1183                         goto out_elf_end;
1184
1185                 gelf_getshdr(sec, &shdr);
1186
1187                 if (is_label && !elf_sec__is_a(&shdr, secstrs, map->type))
1188                         continue;
1189
1190                 section_name = elf_sec__name(&shdr, secstrs);
1191
1192                 /* On ARM, symbols for thumb functions have 1 added to
1193                  * the symbol address as a flag - remove it */
1194                 if ((ehdr.e_machine == EM_ARM) &&
1195                     (map->type == MAP__FUNCTION) &&
1196                     (sym.st_value & 1))
1197                         --sym.st_value;
1198
1199                 if (dso->kernel != DSO_TYPE_USER || kmodule) {
1200                         char dso_name[PATH_MAX];
1201
1202                         if (strcmp(section_name,
1203                                    (curr_dso->short_name +
1204                                     dso->short_name_len)) == 0)
1205                                 goto new_symbol;
1206
1207                         if (strcmp(section_name, ".text") == 0) {
1208                                 curr_map = map;
1209                                 curr_dso = dso;
1210                                 goto new_symbol;
1211                         }
1212
1213                         snprintf(dso_name, sizeof(dso_name),
1214                                  "%s%s", dso->short_name, section_name);
1215
1216                         curr_map = map_groups__find_by_name(kmap->kmaps, map->type, dso_name);
1217                         if (curr_map == NULL) {
1218                                 u64 start = sym.st_value;
1219
1220                                 if (kmodule)
1221                                         start += map->start + shdr.sh_offset;
1222
1223                                 curr_dso = dso__new(dso_name);
1224                                 if (curr_dso == NULL)
1225                                         goto out_elf_end;
1226                                 curr_dso->kernel = dso->kernel;
1227                                 curr_dso->long_name = dso->long_name;
1228                                 curr_dso->long_name_len = dso->long_name_len;
1229                                 curr_map = map__new2(start, curr_dso,
1230                                                      map->type);
1231                                 if (curr_map == NULL) {
1232                                         dso__delete(curr_dso);
1233                                         goto out_elf_end;
1234                                 }
1235                                 curr_map->map_ip = identity__map_ip;
1236                                 curr_map->unmap_ip = identity__map_ip;
1237                                 curr_dso->symtab_type = dso->symtab_type;
1238                                 map_groups__insert(kmap->kmaps, curr_map);
1239                                 dsos__add(&dso->node, curr_dso);
1240                                 dso__set_loaded(curr_dso, map->type);
1241                         } else
1242                                 curr_dso = curr_map->dso;
1243
1244                         goto new_symbol;
1245                 }
1246
1247                 if (curr_dso->adjust_symbols) {
1248                         pr_debug4("%s: adjusting symbol: st_value: %#" PRIx64 " "
1249                                   "sh_addr: %#" PRIx64 " sh_offset: %#" PRIx64 "\n", __func__,
1250                                   (u64)sym.st_value, (u64)shdr.sh_addr,
1251                                   (u64)shdr.sh_offset);
1252                         sym.st_value -= shdr.sh_addr - shdr.sh_offset;
1253                 }
1254                 /*
1255                  * We need to figure out if the object was created from C++ sources
1256                  * DWARF DW_compile_unit has this, but we don't always have access
1257                  * to it...
1258                  */
1259                 demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI);
1260                 if (demangled != NULL)
1261                         elf_name = demangled;
1262 new_symbol:
1263                 f = symbol__new(sym.st_value, sym.st_size,
1264                                 GELF_ST_BIND(sym.st_info), elf_name);
1265                 free(demangled);
1266                 if (!f)
1267                         goto out_elf_end;
1268
1269                 if (filter && filter(curr_map, f))
1270                         symbol__delete(f);
1271                 else {
1272                         symbols__insert(&curr_dso->symbols[curr_map->type], f);
1273                         nr++;
1274                 }
1275         }
1276
1277         /*
1278          * For misannotated, zeroed, ASM function sizes.
1279          */
1280         if (nr > 0) {
1281                 symbols__fixup_end(&dso->symbols[map->type]);
1282                 if (kmap) {
1283                         /*
1284                          * We need to fixup this here too because we create new
1285                          * maps here, for things like vsyscall sections.
1286                          */
1287                         __map_groups__fixup_end(kmap->kmaps, map->type);
1288                 }
1289         }
1290         err = nr;
1291 out_elf_end:
1292         elf_end(elf);
1293 out_close:
1294         return err;
1295 }
1296
1297 static bool dso__build_id_equal(const struct dso *dso, u8 *build_id)
1298 {
1299         return memcmp(dso->build_id, build_id, sizeof(dso->build_id)) == 0;
1300 }
1301
1302 bool __dsos__read_build_ids(struct list_head *head, bool with_hits)
1303 {
1304         bool have_build_id = false;
1305         struct dso *pos;
1306
1307         list_for_each_entry(pos, head, node) {
1308                 if (with_hits && !pos->hit)
1309                         continue;
1310                 if (pos->has_build_id) {
1311                         have_build_id = true;
1312                         continue;
1313                 }
1314                 if (filename__read_build_id(pos->long_name, pos->build_id,
1315                                             sizeof(pos->build_id)) > 0) {
1316                         have_build_id     = true;
1317                         pos->has_build_id = true;
1318                 }
1319         }
1320
1321         return have_build_id;
1322 }
1323
1324 /*
1325  * Align offset to 4 bytes as needed for note name and descriptor data.
1326  */
1327 #define NOTE_ALIGN(n) (((n) + 3) & -4U)
1328
1329 static int elf_read_build_id(Elf *elf, void *bf, size_t size)
1330 {
1331         int err = -1;
1332         GElf_Ehdr ehdr;
1333         GElf_Shdr shdr;
1334         Elf_Data *data;
1335         Elf_Scn *sec;
1336         Elf_Kind ek;
1337         void *ptr;
1338
1339         if (size < BUILD_ID_SIZE)
1340                 goto out;
1341
1342         ek = elf_kind(elf);
1343         if (ek != ELF_K_ELF)
1344                 goto out;
1345
1346         if (gelf_getehdr(elf, &ehdr) == NULL) {
1347                 pr_err("%s: cannot get elf header.\n", __func__);
1348                 goto out;
1349         }
1350
1351         sec = elf_section_by_name(elf, &ehdr, &shdr,
1352                                   ".note.gnu.build-id", NULL);
1353         if (sec == NULL) {
1354                 sec = elf_section_by_name(elf, &ehdr, &shdr,
1355                                           ".notes", NULL);
1356                 if (sec == NULL)
1357                         goto out;
1358         }
1359
1360         data = elf_getdata(sec, NULL);
1361         if (data == NULL)
1362                 goto out;
1363
1364         ptr = data->d_buf;
1365         while (ptr < (data->d_buf + data->d_size)) {
1366                 GElf_Nhdr *nhdr = ptr;
1367                 int namesz = NOTE_ALIGN(nhdr->n_namesz),
1368                     descsz = NOTE_ALIGN(nhdr->n_descsz);
1369                 const char *name;
1370
1371                 ptr += sizeof(*nhdr);
1372                 name = ptr;
1373                 ptr += namesz;
1374                 if (nhdr->n_type == NT_GNU_BUILD_ID &&
1375                     nhdr->n_namesz == sizeof("GNU")) {
1376                         if (memcmp(name, "GNU", sizeof("GNU")) == 0) {
1377                                 memcpy(bf, ptr, BUILD_ID_SIZE);
1378                                 err = BUILD_ID_SIZE;
1379                                 break;
1380                         }
1381                 }
1382                 ptr += descsz;
1383         }
1384
1385 out:
1386         return err;
1387 }
1388
1389 int filename__read_build_id(const char *filename, void *bf, size_t size)
1390 {
1391         int fd, err = -1;
1392         Elf *elf;
1393
1394         if (size < BUILD_ID_SIZE)
1395                 goto out;
1396
1397         fd = open(filename, O_RDONLY);
1398         if (fd < 0)
1399                 goto out;
1400
1401         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1402         if (elf == NULL) {
1403                 pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename);
1404                 goto out_close;
1405         }
1406
1407         err = elf_read_build_id(elf, bf, size);
1408
1409         elf_end(elf);
1410 out_close:
1411         close(fd);
1412 out:
1413         return err;
1414 }
1415
1416 int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
1417 {
1418         int fd, err = -1;
1419
1420         if (size < BUILD_ID_SIZE)
1421                 goto out;
1422
1423         fd = open(filename, O_RDONLY);
1424         if (fd < 0)
1425                 goto out;
1426
1427         while (1) {
1428                 char bf[BUFSIZ];
1429                 GElf_Nhdr nhdr;
1430                 int namesz, descsz;
1431
1432                 if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr))
1433                         break;
1434
1435                 namesz = NOTE_ALIGN(nhdr.n_namesz);
1436                 descsz = NOTE_ALIGN(nhdr.n_descsz);
1437                 if (nhdr.n_type == NT_GNU_BUILD_ID &&
1438                     nhdr.n_namesz == sizeof("GNU")) {
1439                         if (read(fd, bf, namesz) != namesz)
1440                                 break;
1441                         if (memcmp(bf, "GNU", sizeof("GNU")) == 0) {
1442                                 if (read(fd, build_id,
1443                                     BUILD_ID_SIZE) == BUILD_ID_SIZE) {
1444                                         err = 0;
1445                                         break;
1446                                 }
1447                         } else if (read(fd, bf, descsz) != descsz)
1448                                 break;
1449                 } else {
1450                         int n = namesz + descsz;
1451                         if (read(fd, bf, n) != n)
1452                                 break;
1453                 }
1454         }
1455         close(fd);
1456 out:
1457         return err;
1458 }
1459
1460 char dso__symtab_origin(const struct dso *dso)
1461 {
1462         static const char origin[] = {
1463                 [SYMTAB__KALLSYMS]            = 'k',
1464                 [SYMTAB__JAVA_JIT]            = 'j',
1465                 [SYMTAB__BUILD_ID_CACHE]      = 'B',
1466                 [SYMTAB__FEDORA_DEBUGINFO]    = 'f',
1467                 [SYMTAB__UBUNTU_DEBUGINFO]    = 'u',
1468                 [SYMTAB__BUILDID_DEBUGINFO]   = 'b',
1469                 [SYMTAB__SYSTEM_PATH_DSO]     = 'd',
1470                 [SYMTAB__SYSTEM_PATH_KMODULE] = 'K',
1471                 [SYMTAB__GUEST_KALLSYMS]      =  'g',
1472                 [SYMTAB__GUEST_KMODULE]       =  'G',
1473         };
1474
1475         if (dso == NULL || dso->symtab_type == SYMTAB__NOT_FOUND)
1476                 return '!';
1477         return origin[dso->symtab_type];
1478 }
1479
1480 int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
1481 {
1482         int size = PATH_MAX;
1483         char *name;
1484         int ret = -1;
1485         int fd;
1486         struct machine *machine;
1487         const char *root_dir;
1488         int want_symtab;
1489
1490         dso__set_loaded(dso, map->type);
1491
1492         if (dso->kernel == DSO_TYPE_KERNEL)
1493                 return dso__load_kernel_sym(dso, map, filter);
1494         else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1495                 return dso__load_guest_kernel_sym(dso, map, filter);
1496
1497         if (map->groups && map->groups->machine)
1498                 machine = map->groups->machine;
1499         else
1500                 machine = NULL;
1501
1502         name = malloc(size);
1503         if (!name)
1504                 return -1;
1505
1506         dso->adjust_symbols = 0;
1507
1508         if (strncmp(dso->name, "/tmp/perf-", 10) == 0) {
1509                 struct stat st;
1510
1511                 if (lstat(dso->name, &st) < 0)
1512                         return -1;
1513
1514                 if (st.st_uid && (st.st_uid != geteuid())) {
1515                         pr_warning("File %s not owned by current user or root, "
1516                                 "ignoring it.\n", dso->name);
1517                         return -1;
1518                 }
1519
1520                 ret = dso__load_perf_map(dso, map, filter);
1521                 dso->symtab_type = ret > 0 ? SYMTAB__JAVA_JIT :
1522                                               SYMTAB__NOT_FOUND;
1523                 return ret;
1524         }
1525
1526         /* Iterate over candidate debug images.
1527          * On the first pass, only load images if they have a full symtab.
1528          * Failing that, do a second pass where we accept .dynsym also
1529          */
1530         want_symtab = 1;
1531 restart:
1532         for (dso->symtab_type = SYMTAB__BUILD_ID_CACHE;
1533              dso->symtab_type != SYMTAB__NOT_FOUND;
1534              dso->symtab_type++) {
1535                 switch (dso->symtab_type) {
1536                 case SYMTAB__BUILD_ID_CACHE:
1537                         /* skip the locally configured cache if a symfs is given */
1538                         if (symbol_conf.symfs[0] ||
1539                             (dso__build_id_filename(dso, name, size) == NULL)) {
1540                                 continue;
1541                         }
1542                         break;
1543                 case SYMTAB__FEDORA_DEBUGINFO:
1544                         snprintf(name, size, "%s/usr/lib/debug%s.debug",
1545                                  symbol_conf.symfs, dso->long_name);
1546                         break;
1547                 case SYMTAB__UBUNTU_DEBUGINFO:
1548                         snprintf(name, size, "%s/usr/lib/debug%s",
1549                                  symbol_conf.symfs, dso->long_name);
1550                         break;
1551                 case SYMTAB__BUILDID_DEBUGINFO: {
1552                         char build_id_hex[BUILD_ID_SIZE * 2 + 1];
1553
1554                         if (!dso->has_build_id)
1555                                 continue;
1556
1557                         build_id__sprintf(dso->build_id,
1558                                           sizeof(dso->build_id),
1559                                           build_id_hex);
1560                         snprintf(name, size,
1561                                  "%s/usr/lib/debug/.build-id/%.2s/%s.debug",
1562                                  symbol_conf.symfs, build_id_hex, build_id_hex + 2);
1563                         }
1564                         break;
1565                 case SYMTAB__SYSTEM_PATH_DSO:
1566                         snprintf(name, size, "%s%s",
1567                              symbol_conf.symfs, dso->long_name);
1568                         break;
1569                 case SYMTAB__GUEST_KMODULE:
1570                         if (map->groups && machine)
1571                                 root_dir = machine->root_dir;
1572                         else
1573                                 root_dir = "";
1574                         snprintf(name, size, "%s%s%s", symbol_conf.symfs,
1575                                  root_dir, dso->long_name);
1576                         break;
1577
1578                 case SYMTAB__SYSTEM_PATH_KMODULE:
1579                         snprintf(name, size, "%s%s", symbol_conf.symfs,
1580                                  dso->long_name);
1581                         break;
1582                 default:;
1583                 }
1584
1585                 /* Name is now the name of the next image to try */
1586                 fd = open(name, O_RDONLY);
1587                 if (fd < 0)
1588                         continue;
1589
1590                 ret = dso__load_sym(dso, map, name, fd, filter, 0,
1591                                     want_symtab);
1592                 close(fd);
1593
1594                 /*
1595                  * Some people seem to have debuginfo files _WITHOUT_ debug
1596                  * info!?!?
1597                  */
1598                 if (!ret)
1599                         continue;
1600
1601                 if (ret > 0) {
1602                         int nr_plt = dso__synthesize_plt_symbols(dso, map,
1603                                                                  filter);
1604                         if (nr_plt > 0)
1605                                 ret += nr_plt;
1606                         break;
1607                 }
1608         }
1609
1610         /*
1611          * If we wanted a full symtab but no image had one,
1612          * relax our requirements and repeat the search.
1613          */
1614         if (ret <= 0 && want_symtab) {
1615                 want_symtab = 0;
1616                 goto restart;
1617         }
1618
1619         free(name);
1620         if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1621                 return 0;
1622         return ret;
1623 }
1624
1625 struct map *map_groups__find_by_name(struct map_groups *mg,
1626                                      enum map_type type, const char *name)
1627 {
1628         struct rb_node *nd;
1629
1630         for (nd = rb_first(&mg->maps[type]); nd; nd = rb_next(nd)) {
1631                 struct map *map = rb_entry(nd, struct map, rb_node);
1632
1633                 if (map->dso && strcmp(map->dso->short_name, name) == 0)
1634                         return map;
1635         }
1636
1637         return NULL;
1638 }
1639
1640 static int dso__kernel_module_get_build_id(struct dso *dso,
1641                                            const char *root_dir)
1642 {
1643         char filename[PATH_MAX];
1644         /*
1645          * kernel module short names are of the form "[module]" and
1646          * we need just "module" here.
1647          */
1648         const char *name = dso->short_name + 1;
1649
1650         snprintf(filename, sizeof(filename),
1651                  "%s/sys/module/%.*s/notes/.note.gnu.build-id",
1652                  root_dir, (int)strlen(name) - 1, name);
1653
1654         if (sysfs__read_build_id(filename, dso->build_id,
1655                                  sizeof(dso->build_id)) == 0)
1656                 dso->has_build_id = true;
1657
1658         return 0;
1659 }
1660
1661 static int map_groups__set_modules_path_dir(struct map_groups *mg,
1662                                 const char *dir_name)
1663 {
1664         struct dirent *dent;
1665         DIR *dir = opendir(dir_name);
1666         int ret = 0;
1667
1668         if (!dir) {
1669                 pr_debug("%s: cannot open %s dir\n", __func__, dir_name);
1670                 return -1;
1671         }
1672
1673         while ((dent = readdir(dir)) != NULL) {
1674                 char path[PATH_MAX];
1675                 struct stat st;
1676
1677                 /*sshfs might return bad dent->d_type, so we have to stat*/
1678                 sprintf(path, "%s/%s", dir_name, dent->d_name);
1679                 if (stat(path, &st))
1680                         continue;
1681
1682                 if (S_ISDIR(st.st_mode)) {
1683                         if (!strcmp(dent->d_name, ".") ||
1684                             !strcmp(dent->d_name, ".."))
1685                                 continue;
1686
1687                         snprintf(path, sizeof(path), "%s/%s",
1688                                  dir_name, dent->d_name);
1689                         ret = map_groups__set_modules_path_dir(mg, path);
1690                         if (ret < 0)
1691                                 goto out;
1692                 } else {
1693                         char *dot = strrchr(dent->d_name, '.'),
1694                              dso_name[PATH_MAX];
1695                         struct map *map;
1696                         char *long_name;
1697
1698                         if (dot == NULL || strcmp(dot, ".ko"))
1699                                 continue;
1700                         snprintf(dso_name, sizeof(dso_name), "[%.*s]",
1701                                  (int)(dot - dent->d_name), dent->d_name);
1702
1703                         strxfrchar(dso_name, '-', '_');
1704                         map = map_groups__find_by_name(mg, MAP__FUNCTION,
1705                                                        dso_name);
1706                         if (map == NULL)
1707                                 continue;
1708
1709                         snprintf(path, sizeof(path), "%s/%s",
1710                                  dir_name, dent->d_name);
1711
1712                         long_name = strdup(path);
1713                         if (long_name == NULL) {
1714                                 ret = -1;
1715                                 goto out;
1716                         }
1717                         dso__set_long_name(map->dso, long_name);
1718                         map->dso->lname_alloc = 1;
1719                         dso__kernel_module_get_build_id(map->dso, "");
1720                 }
1721         }
1722
1723 out:
1724         closedir(dir);
1725         return ret;
1726 }
1727
1728 static char *get_kernel_version(const char *root_dir)
1729 {
1730         char version[PATH_MAX];
1731         FILE *file;
1732         char *name, *tmp;
1733         const char *prefix = "Linux version ";
1734
1735         sprintf(version, "%s/proc/version", root_dir);
1736         file = fopen(version, "r");
1737         if (!file)
1738                 return NULL;
1739
1740         version[0] = '\0';
1741         tmp = fgets(version, sizeof(version), file);
1742         fclose(file);
1743
1744         name = strstr(version, prefix);
1745         if (!name)
1746                 return NULL;
1747         name += strlen(prefix);
1748         tmp = strchr(name, ' ');
1749         if (tmp)
1750                 *tmp = '\0';
1751
1752         return strdup(name);
1753 }
1754
1755 static int machine__set_modules_path(struct machine *machine)
1756 {
1757         char *version;
1758         char modules_path[PATH_MAX];
1759
1760         version = get_kernel_version(machine->root_dir);
1761         if (!version)
1762                 return -1;
1763
1764         snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s/kernel",
1765                  machine->root_dir, version);
1766         free(version);
1767
1768         return map_groups__set_modules_path_dir(&machine->kmaps, modules_path);
1769 }
1770
1771 /*
1772  * Constructor variant for modules (where we know from /proc/modules where
1773  * they are loaded) and for vmlinux, where only after we load all the
1774  * symbols we'll know where it starts and ends.
1775  */
1776 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type)
1777 {
1778         struct map *map = calloc(1, (sizeof(*map) +
1779                                      (dso->kernel ? sizeof(struct kmap) : 0)));
1780         if (map != NULL) {
1781                 /*
1782                  * ->end will be filled after we load all the symbols
1783                  */
1784                 map__init(map, type, start, 0, 0, dso);
1785         }
1786
1787         return map;
1788 }
1789
1790 struct map *machine__new_module(struct machine *machine, u64 start,
1791                                 const char *filename)
1792 {
1793         struct map *map;
1794         struct dso *dso = __dsos__findnew(&machine->kernel_dsos, filename);
1795
1796         if (dso == NULL)
1797                 return NULL;
1798
1799         map = map__new2(start, dso, MAP__FUNCTION);
1800         if (map == NULL)
1801                 return NULL;
1802
1803         if (machine__is_host(machine))
1804                 dso->symtab_type = SYMTAB__SYSTEM_PATH_KMODULE;
1805         else
1806                 dso->symtab_type = SYMTAB__GUEST_KMODULE;
1807         map_groups__insert(&machine->kmaps, map);
1808         return map;
1809 }
1810
1811 static int machine__create_modules(struct machine *machine)
1812 {
1813         char *line = NULL;
1814         size_t n;
1815         FILE *file;
1816         struct map *map;
1817         const char *modules;
1818         char path[PATH_MAX];
1819
1820         if (machine__is_default_guest(machine))
1821                 modules = symbol_conf.default_guest_modules;
1822         else {
1823                 sprintf(path, "%s/proc/modules", machine->root_dir);
1824                 modules = path;
1825         }
1826
1827         if (symbol__restricted_filename(path, "/proc/modules"))
1828                 return -1;
1829
1830         file = fopen(modules, "r");
1831         if (file == NULL)
1832                 return -1;
1833
1834         while (!feof(file)) {
1835                 char name[PATH_MAX];
1836                 u64 start;
1837                 char *sep;
1838                 int line_len;
1839
1840                 line_len = getline(&line, &n, file);
1841                 if (line_len < 0)
1842                         break;
1843
1844                 if (!line)
1845                         goto out_failure;
1846
1847                 line[--line_len] = '\0'; /* \n */
1848
1849                 sep = strrchr(line, 'x');
1850                 if (sep == NULL)
1851                         continue;
1852
1853                 hex2u64(sep + 1, &start);
1854
1855                 sep = strchr(line, ' ');
1856                 if (sep == NULL)
1857                         continue;
1858
1859                 *sep = '\0';
1860
1861                 snprintf(name, sizeof(name), "[%s]", line);
1862                 map = machine__new_module(machine, start, name);
1863                 if (map == NULL)
1864                         goto out_delete_line;
1865                 dso__kernel_module_get_build_id(map->dso, machine->root_dir);
1866         }
1867
1868         free(line);
1869         fclose(file);
1870
1871         return machine__set_modules_path(machine);
1872
1873 out_delete_line:
1874         free(line);
1875 out_failure:
1876         return -1;
1877 }
1878
1879 int dso__load_vmlinux(struct dso *dso, struct map *map,
1880                       const char *vmlinux, symbol_filter_t filter)
1881 {
1882         int err = -1, fd;
1883         char symfs_vmlinux[PATH_MAX];
1884
1885         snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s%s",
1886                  symbol_conf.symfs, vmlinux);
1887         fd = open(symfs_vmlinux, O_RDONLY);
1888         if (fd < 0)
1889                 return -1;
1890
1891         dso__set_long_name(dso, (char *)vmlinux);
1892         dso__set_loaded(dso, map->type);
1893         err = dso__load_sym(dso, map, symfs_vmlinux, fd, filter, 0, 0);
1894         close(fd);
1895
1896         if (err > 0)
1897                 pr_debug("Using %s for symbols\n", symfs_vmlinux);
1898
1899         return err;
1900 }
1901
1902 int dso__load_vmlinux_path(struct dso *dso, struct map *map,
1903                            symbol_filter_t filter)
1904 {
1905         int i, err = 0;
1906         char *filename;
1907
1908         pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1909                  vmlinux_path__nr_entries + 1);
1910
1911         filename = dso__build_id_filename(dso, NULL, 0);
1912         if (filename != NULL) {
1913                 err = dso__load_vmlinux(dso, map, filename, filter);
1914                 if (err > 0) {
1915                         dso__set_long_name(dso, filename);
1916                         goto out;
1917                 }
1918                 free(filename);
1919         }
1920
1921         for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1922                 err = dso__load_vmlinux(dso, map, vmlinux_path[i], filter);
1923                 if (err > 0) {
1924                         dso__set_long_name(dso, strdup(vmlinux_path[i]));
1925                         break;
1926                 }
1927         }
1928 out:
1929         return err;
1930 }
1931
1932 static int dso__load_kernel_sym(struct dso *dso, struct map *map,
1933                                 symbol_filter_t filter)
1934 {
1935         int err;
1936         const char *kallsyms_filename = NULL;
1937         char *kallsyms_allocated_filename = NULL;
1938         /*
1939          * Step 1: if the user specified a kallsyms or vmlinux filename, use
1940          * it and only it, reporting errors to the user if it cannot be used.
1941          *
1942          * For instance, try to analyse an ARM perf.data file _without_ a
1943          * build-id, or if the user specifies the wrong path to the right
1944          * vmlinux file, obviously we can't fallback to another vmlinux (a
1945          * x86_86 one, on the machine where analysis is being performed, say),
1946          * or worse, /proc/kallsyms.
1947          *
1948          * If the specified file _has_ a build-id and there is a build-id
1949          * section in the perf.data file, we will still do the expected
1950          * validation in dso__load_vmlinux and will bail out if they don't
1951          * match.
1952          */
1953         if (symbol_conf.kallsyms_name != NULL) {
1954                 kallsyms_filename = symbol_conf.kallsyms_name;
1955                 goto do_kallsyms;
1956         }
1957
1958         if (symbol_conf.vmlinux_name != NULL) {
1959                 err = dso__load_vmlinux(dso, map,
1960                                         symbol_conf.vmlinux_name, filter);
1961                 if (err > 0) {
1962                         dso__set_long_name(dso,
1963                                            strdup(symbol_conf.vmlinux_name));
1964                         goto out_fixup;
1965                 }
1966                 return err;
1967         }
1968
1969         if (vmlinux_path != NULL) {
1970                 err = dso__load_vmlinux_path(dso, map, filter);
1971                 if (err > 0)
1972                         goto out_fixup;
1973         }
1974
1975         /* do not try local files if a symfs was given */
1976         if (symbol_conf.symfs[0] != 0)
1977                 return -1;
1978
1979         /*
1980          * Say the kernel DSO was created when processing the build-id header table,
1981          * we have a build-id, so check if it is the same as the running kernel,
1982          * using it if it is.
1983          */
1984         if (dso->has_build_id) {
1985                 u8 kallsyms_build_id[BUILD_ID_SIZE];
1986                 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
1987
1988                 if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id,
1989                                          sizeof(kallsyms_build_id)) == 0) {
1990                         if (dso__build_id_equal(dso, kallsyms_build_id)) {
1991                                 kallsyms_filename = "/proc/kallsyms";
1992                                 goto do_kallsyms;
1993                         }
1994                 }
1995                 /*
1996                  * Now look if we have it on the build-id cache in
1997                  * $HOME/.debug/[kernel.kallsyms].
1998                  */
1999                 build_id__sprintf(dso->build_id, sizeof(dso->build_id),
2000                                   sbuild_id);
2001
2002                 if (asprintf(&kallsyms_allocated_filename,
2003                              "%s/.debug/[kernel.kallsyms]/%s",
2004                              getenv("HOME"), sbuild_id) == -1) {
2005                         pr_err("Not enough memory for kallsyms file lookup\n");
2006                         return -1;
2007                 }
2008
2009                 kallsyms_filename = kallsyms_allocated_filename;
2010
2011                 if (access(kallsyms_filename, F_OK)) {
2012                         pr_err("No kallsyms or vmlinux with build-id %s "
2013                                "was found\n", sbuild_id);
2014                         free(kallsyms_allocated_filename);
2015                         return -1;
2016                 }
2017         } else {
2018                 /*
2019                  * Last resort, if we don't have a build-id and couldn't find
2020                  * any vmlinux file, try the running kernel kallsyms table.
2021                  */
2022                 kallsyms_filename = "/proc/kallsyms";
2023         }
2024
2025 do_kallsyms:
2026         err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
2027         if (err > 0)
2028                 pr_debug("Using %s for symbols\n", kallsyms_filename);
2029         free(kallsyms_allocated_filename);
2030
2031         if (err > 0) {
2032 out_fixup:
2033                 if (kallsyms_filename != NULL)
2034                         dso__set_long_name(dso, strdup("[kernel.kallsyms]"));
2035                 map__fixup_start(map);
2036                 map__fixup_end(map);
2037         }
2038
2039         return err;
2040 }
2041
2042 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
2043                                       symbol_filter_t filter)
2044 {
2045         int err;
2046         const char *kallsyms_filename = NULL;
2047         struct machine *machine;
2048         char path[PATH_MAX];
2049
2050         if (!map->groups) {
2051                 pr_debug("Guest kernel map hasn't the point to groups\n");
2052                 return -1;
2053         }
2054         machine = map->groups->machine;
2055
2056         if (machine__is_default_guest(machine)) {
2057                 /*
2058                  * if the user specified a vmlinux filename, use it and only
2059                  * it, reporting errors to the user if it cannot be used.
2060                  * Or use file guest_kallsyms inputted by user on commandline
2061                  */
2062                 if (symbol_conf.default_guest_vmlinux_name != NULL) {
2063                         err = dso__load_vmlinux(dso, map,
2064                                 symbol_conf.default_guest_vmlinux_name, filter);
2065                         goto out_try_fixup;
2066                 }
2067
2068                 kallsyms_filename = symbol_conf.default_guest_kallsyms;
2069                 if (!kallsyms_filename)
2070                         return -1;
2071         } else {
2072                 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2073                 kallsyms_filename = path;
2074         }
2075
2076         err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
2077         if (err > 0)
2078                 pr_debug("Using %s for symbols\n", kallsyms_filename);
2079
2080 out_try_fixup:
2081         if (err > 0) {
2082                 if (kallsyms_filename != NULL) {
2083                         machine__mmap_name(machine, path, sizeof(path));
2084                         dso__set_long_name(dso, strdup(path));
2085                 }
2086                 map__fixup_start(map);
2087                 map__fixup_end(map);
2088         }
2089
2090         return err;
2091 }
2092
2093 static void dsos__add(struct list_head *head, struct dso *dso)
2094 {
2095         list_add_tail(&dso->node, head);
2096 }
2097
2098 static struct dso *dsos__find(struct list_head *head, const char *name)
2099 {
2100         struct dso *pos;
2101
2102         list_for_each_entry(pos, head, node)
2103                 if (strcmp(pos->long_name, name) == 0)
2104                         return pos;
2105         return NULL;
2106 }
2107
2108 struct dso *__dsos__findnew(struct list_head *head, const char *name)
2109 {
2110         struct dso *dso = dsos__find(head, name);
2111
2112         if (!dso) {
2113                 dso = dso__new(name);
2114                 if (dso != NULL) {
2115                         dsos__add(head, dso);
2116                         dso__set_basename(dso);
2117                 }
2118         }
2119
2120         return dso;
2121 }
2122
2123 size_t __dsos__fprintf(struct list_head *head, FILE *fp)
2124 {
2125         struct dso *pos;
2126         size_t ret = 0;
2127
2128         list_for_each_entry(pos, head, node) {
2129                 int i;
2130                 for (i = 0; i < MAP__NR_TYPES; ++i)
2131                         ret += dso__fprintf(pos, i, fp);
2132         }
2133
2134         return ret;
2135 }
2136
2137 size_t machines__fprintf_dsos(struct rb_root *machines, FILE *fp)
2138 {
2139         struct rb_node *nd;
2140         size_t ret = 0;
2141
2142         for (nd = rb_first(machines); nd; nd = rb_next(nd)) {
2143                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
2144                 ret += __dsos__fprintf(&pos->kernel_dsos, fp);
2145                 ret += __dsos__fprintf(&pos->user_dsos, fp);
2146         }
2147
2148         return ret;
2149 }
2150
2151 static size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp,
2152                                       bool with_hits)
2153 {
2154         struct dso *pos;
2155         size_t ret = 0;
2156
2157         list_for_each_entry(pos, head, node) {
2158                 if (with_hits && !pos->hit)
2159                         continue;
2160                 ret += dso__fprintf_buildid(pos, fp);
2161                 ret += fprintf(fp, " %s\n", pos->long_name);
2162         }
2163         return ret;
2164 }
2165
2166 size_t machine__fprintf_dsos_buildid(struct machine *machine, FILE *fp,
2167                                      bool with_hits)
2168 {
2169         return __dsos__fprintf_buildid(&machine->kernel_dsos, fp, with_hits) +
2170                __dsos__fprintf_buildid(&machine->user_dsos, fp, with_hits);
2171 }
2172
2173 size_t machines__fprintf_dsos_buildid(struct rb_root *machines,
2174                                       FILE *fp, bool with_hits)
2175 {
2176         struct rb_node *nd;
2177         size_t ret = 0;
2178
2179         for (nd = rb_first(machines); nd; nd = rb_next(nd)) {
2180                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
2181                 ret += machine__fprintf_dsos_buildid(pos, fp, with_hits);
2182         }
2183         return ret;
2184 }
2185
2186 static struct dso*
2187 dso__kernel_findnew(struct machine *machine, const char *name,
2188                     const char *short_name, int dso_type)
2189 {
2190         /*
2191          * The kernel dso could be created by build_id processing.
2192          */
2193         struct dso *dso = __dsos__findnew(&machine->kernel_dsos, name);
2194
2195         /*
2196          * We need to run this in all cases, since during the build_id
2197          * processing we had no idea this was the kernel dso.
2198          */
2199         if (dso != NULL) {
2200                 dso__set_short_name(dso, short_name);
2201                 dso->kernel = dso_type;
2202         }
2203
2204         return dso;
2205 }
2206
2207 void dso__read_running_kernel_build_id(struct dso *dso, struct machine *machine)
2208 {
2209         char path[PATH_MAX];
2210
2211         if (machine__is_default_guest(machine))
2212                 return;
2213         sprintf(path, "%s/sys/kernel/notes", machine->root_dir);
2214         if (sysfs__read_build_id(path, dso->build_id,
2215                                  sizeof(dso->build_id)) == 0)
2216                 dso->has_build_id = true;
2217 }
2218
2219 static struct dso *machine__get_kernel(struct machine *machine)
2220 {
2221         const char *vmlinux_name = NULL;
2222         struct dso *kernel;
2223
2224         if (machine__is_host(machine)) {
2225                 vmlinux_name = symbol_conf.vmlinux_name;
2226                 if (!vmlinux_name)
2227                         vmlinux_name = "[kernel.kallsyms]";
2228
2229                 kernel = dso__kernel_findnew(machine, vmlinux_name,
2230                                              "[kernel]",
2231                                              DSO_TYPE_KERNEL);
2232         } else {
2233                 char bf[PATH_MAX];
2234
2235                 if (machine__is_default_guest(machine))
2236                         vmlinux_name = symbol_conf.default_guest_vmlinux_name;
2237                 if (!vmlinux_name)
2238                         vmlinux_name = machine__mmap_name(machine, bf,
2239                                                           sizeof(bf));
2240
2241                 kernel = dso__kernel_findnew(machine, vmlinux_name,
2242                                              "[guest.kernel]",
2243                                              DSO_TYPE_GUEST_KERNEL);
2244         }
2245
2246         if (kernel != NULL && (!kernel->has_build_id))
2247                 dso__read_running_kernel_build_id(kernel, machine);
2248
2249         return kernel;
2250 }
2251
2252 struct process_args {
2253         u64 start;
2254 };
2255
2256 static int symbol__in_kernel(void *arg, const char *name,
2257                              char type __used, u64 start, u64 end __used)
2258 {
2259         struct process_args *args = arg;
2260
2261         if (strchr(name, '['))
2262                 return 0;
2263
2264         args->start = start;
2265         return 1;
2266 }
2267
2268 /* Figure out the start address of kernel map from /proc/kallsyms */
2269 static u64 machine__get_kernel_start_addr(struct machine *machine)
2270 {
2271         const char *filename;
2272         char path[PATH_MAX];
2273         struct process_args args;
2274
2275         if (machine__is_host(machine)) {
2276                 filename = "/proc/kallsyms";
2277         } else {
2278                 if (machine__is_default_guest(machine))
2279                         filename = (char *)symbol_conf.default_guest_kallsyms;
2280                 else {
2281                         sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2282                         filename = path;
2283                 }
2284         }
2285
2286         if (symbol__restricted_filename(filename, "/proc/kallsyms"))
2287                 return 0;
2288
2289         if (kallsyms__parse(filename, &args, symbol__in_kernel) <= 0)
2290                 return 0;
2291
2292         return args.start;
2293 }
2294
2295 int __machine__create_kernel_maps(struct machine *machine, struct dso *kernel)
2296 {
2297         enum map_type type;
2298         u64 start = machine__get_kernel_start_addr(machine);
2299
2300         for (type = 0; type < MAP__NR_TYPES; ++type) {
2301                 struct kmap *kmap;
2302
2303                 machine->vmlinux_maps[type] = map__new2(start, kernel, type);
2304                 if (machine->vmlinux_maps[type] == NULL)
2305                         return -1;
2306
2307                 machine->vmlinux_maps[type]->map_ip =
2308                         machine->vmlinux_maps[type]->unmap_ip =
2309                                 identity__map_ip;
2310                 kmap = map__kmap(machine->vmlinux_maps[type]);
2311                 kmap->kmaps = &machine->kmaps;
2312                 map_groups__insert(&machine->kmaps,
2313                                    machine->vmlinux_maps[type]);
2314         }
2315
2316         return 0;
2317 }
2318
2319 void machine__destroy_kernel_maps(struct machine *machine)
2320 {
2321         enum map_type type;
2322
2323         for (type = 0; type < MAP__NR_TYPES; ++type) {
2324                 struct kmap *kmap;
2325
2326                 if (machine->vmlinux_maps[type] == NULL)
2327                         continue;
2328
2329                 kmap = map__kmap(machine->vmlinux_maps[type]);
2330                 map_groups__remove(&machine->kmaps,
2331                                    machine->vmlinux_maps[type]);
2332                 if (kmap->ref_reloc_sym) {
2333                         /*
2334                          * ref_reloc_sym is shared among all maps, so free just
2335                          * on one of them.
2336                          */
2337                         if (type == MAP__FUNCTION) {
2338                                 free((char *)kmap->ref_reloc_sym->name);
2339                                 kmap->ref_reloc_sym->name = NULL;
2340                                 free(kmap->ref_reloc_sym);
2341                         }
2342                         kmap->ref_reloc_sym = NULL;
2343                 }
2344
2345                 map__delete(machine->vmlinux_maps[type]);
2346                 machine->vmlinux_maps[type] = NULL;
2347         }
2348 }
2349
2350 int machine__create_kernel_maps(struct machine *machine)
2351 {
2352         struct dso *kernel = machine__get_kernel(machine);
2353
2354         if (kernel == NULL ||
2355             __machine__create_kernel_maps(machine, kernel) < 0)
2356                 return -1;
2357
2358         if (symbol_conf.use_modules && machine__create_modules(machine) < 0)
2359                 pr_debug("Problems creating module maps, continuing anyway...\n");
2360         /*
2361          * Now that we have all the maps created, just set the ->end of them:
2362          */
2363         map_groups__fixup_end(&machine->kmaps);
2364         return 0;
2365 }
2366
2367 static void vmlinux_path__exit(void)
2368 {
2369         while (--vmlinux_path__nr_entries >= 0) {
2370                 free(vmlinux_path[vmlinux_path__nr_entries]);
2371                 vmlinux_path[vmlinux_path__nr_entries] = NULL;
2372         }
2373
2374         free(vmlinux_path);
2375         vmlinux_path = NULL;
2376 }
2377
2378 static int vmlinux_path__init(void)
2379 {
2380         struct utsname uts;
2381         char bf[PATH_MAX];
2382
2383         vmlinux_path = malloc(sizeof(char *) * 5);
2384         if (vmlinux_path == NULL)
2385                 return -1;
2386
2387         vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
2388         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2389                 goto out_fail;
2390         ++vmlinux_path__nr_entries;
2391         vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
2392         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2393                 goto out_fail;
2394         ++vmlinux_path__nr_entries;
2395
2396         /* only try running kernel version if no symfs was given */
2397         if (symbol_conf.symfs[0] != 0)
2398                 return 0;
2399
2400         if (uname(&uts) < 0)
2401                 return -1;
2402
2403         snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", 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         snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release);
2409         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2410         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2411                 goto out_fail;
2412         ++vmlinux_path__nr_entries;
2413         snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
2414                  uts.release);
2415         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2416         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2417                 goto out_fail;
2418         ++vmlinux_path__nr_entries;
2419
2420         return 0;
2421
2422 out_fail:
2423         vmlinux_path__exit();
2424         return -1;
2425 }
2426
2427 size_t machine__fprintf_vmlinux_path(struct machine *machine, FILE *fp)
2428 {
2429         int i;
2430         size_t printed = 0;
2431         struct dso *kdso = machine->vmlinux_maps[MAP__FUNCTION]->dso;
2432
2433         if (kdso->has_build_id) {
2434                 char filename[PATH_MAX];
2435                 if (dso__build_id_filename(kdso, filename, sizeof(filename)))
2436                         printed += fprintf(fp, "[0] %s\n", filename);
2437         }
2438
2439         for (i = 0; i < vmlinux_path__nr_entries; ++i)
2440                 printed += fprintf(fp, "[%d] %s\n",
2441                                    i + kdso->has_build_id, vmlinux_path[i]);
2442
2443         return printed;
2444 }
2445
2446 static int setup_list(struct strlist **list, const char *list_str,
2447                       const char *list_name)
2448 {
2449         if (list_str == NULL)
2450                 return 0;
2451
2452         *list = strlist__new(true, list_str);
2453         if (!*list) {
2454                 pr_err("problems parsing %s list\n", list_name);
2455                 return -1;
2456         }
2457         return 0;
2458 }
2459
2460 static bool symbol__read_kptr_restrict(void)
2461 {
2462         bool value = false;
2463
2464         if (geteuid() != 0) {
2465                 FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
2466                 if (fp != NULL) {
2467                         char line[8];
2468
2469                         if (fgets(line, sizeof(line), fp) != NULL)
2470                                 value = atoi(line) != 0;
2471
2472                         fclose(fp);
2473                 }
2474         }
2475
2476         return value;
2477 }
2478
2479 int symbol__init(void)
2480 {
2481         const char *symfs;
2482
2483         if (symbol_conf.initialized)
2484                 return 0;
2485
2486         symbol_conf.priv_size = ALIGN(symbol_conf.priv_size, sizeof(u64));
2487
2488         elf_version(EV_CURRENT);
2489         if (symbol_conf.sort_by_name)
2490                 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
2491                                           sizeof(struct symbol));
2492
2493         if (symbol_conf.try_vmlinux_path && vmlinux_path__init() < 0)
2494                 return -1;
2495
2496         if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
2497                 pr_err("'.' is the only non valid --field-separator argument\n");
2498                 return -1;
2499         }
2500
2501         if (setup_list(&symbol_conf.dso_list,
2502                        symbol_conf.dso_list_str, "dso") < 0)
2503                 return -1;
2504
2505         if (setup_list(&symbol_conf.comm_list,
2506                        symbol_conf.comm_list_str, "comm") < 0)
2507                 goto out_free_dso_list;
2508
2509         if (setup_list(&symbol_conf.sym_list,
2510                        symbol_conf.sym_list_str, "symbol") < 0)
2511                 goto out_free_comm_list;
2512
2513         /*
2514          * A path to symbols of "/" is identical to ""
2515          * reset here for simplicity.
2516          */
2517         symfs = realpath(symbol_conf.symfs, NULL);
2518         if (symfs == NULL)
2519                 symfs = symbol_conf.symfs;
2520         if (strcmp(symfs, "/") == 0)
2521                 symbol_conf.symfs = "";
2522         if (symfs != symbol_conf.symfs)
2523                 free((void *)symfs);
2524
2525         symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
2526
2527         symbol_conf.initialized = true;
2528         return 0;
2529
2530 out_free_dso_list:
2531         strlist__delete(symbol_conf.dso_list);
2532 out_free_comm_list:
2533         strlist__delete(symbol_conf.comm_list);
2534         return -1;
2535 }
2536
2537 void symbol__exit(void)
2538 {
2539         if (!symbol_conf.initialized)
2540                 return;
2541         strlist__delete(symbol_conf.sym_list);
2542         strlist__delete(symbol_conf.dso_list);
2543         strlist__delete(symbol_conf.comm_list);
2544         vmlinux_path__exit();
2545         symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2546         symbol_conf.initialized = false;
2547 }
2548
2549 int machines__create_kernel_maps(struct rb_root *machines, pid_t pid)
2550 {
2551         struct machine *machine = machines__findnew(machines, pid);
2552
2553         if (machine == NULL)
2554                 return -1;
2555
2556         return machine__create_kernel_maps(machine);
2557 }
2558
2559 static int hex(char ch)
2560 {
2561         if ((ch >= '0') && (ch <= '9'))
2562                 return ch - '0';
2563         if ((ch >= 'a') && (ch <= 'f'))
2564                 return ch - 'a' + 10;
2565         if ((ch >= 'A') && (ch <= 'F'))
2566                 return ch - 'A' + 10;
2567         return -1;
2568 }
2569
2570 /*
2571  * While we find nice hex chars, build a long_val.
2572  * Return number of chars processed.
2573  */
2574 int hex2u64(const char *ptr, u64 *long_val)
2575 {
2576         const char *p = ptr;
2577         *long_val = 0;
2578
2579         while (*p) {
2580                 const int hex_val = hex(*p);
2581
2582                 if (hex_val < 0)
2583                         break;
2584
2585                 *long_val = (*long_val << 4) | hex_val;
2586                 p++;
2587         }
2588
2589         return p - ptr;
2590 }
2591
2592 char *strxfrchar(char *s, char from, char to)
2593 {
2594         char *p = s;
2595
2596         while ((p = strchr(p, from)) != NULL)
2597                 *p++ = to;
2598
2599         return s;
2600 }
2601
2602 int machines__create_guest_kernel_maps(struct rb_root *machines)
2603 {
2604         int ret = 0;
2605         struct dirent **namelist = NULL;
2606         int i, items = 0;
2607         char path[PATH_MAX];
2608         pid_t pid;
2609
2610         if (symbol_conf.default_guest_vmlinux_name ||
2611             symbol_conf.default_guest_modules ||
2612             symbol_conf.default_guest_kallsyms) {
2613                 machines__create_kernel_maps(machines, DEFAULT_GUEST_KERNEL_ID);
2614         }
2615
2616         if (symbol_conf.guestmount) {
2617                 items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL);
2618                 if (items <= 0)
2619                         return -ENOENT;
2620                 for (i = 0; i < items; i++) {
2621                         if (!isdigit(namelist[i]->d_name[0])) {
2622                                 /* Filter out . and .. */
2623                                 continue;
2624                         }
2625                         pid = atoi(namelist[i]->d_name);
2626                         sprintf(path, "%s/%s/proc/kallsyms",
2627                                 symbol_conf.guestmount,
2628                                 namelist[i]->d_name);
2629                         ret = access(path, R_OK);
2630                         if (ret) {
2631                                 pr_debug("Can't access file %s\n", path);
2632                                 goto failure;
2633                         }
2634                         machines__create_kernel_maps(machines, pid);
2635                 }
2636 failure:
2637                 free(namelist);
2638         }
2639
2640         return ret;
2641 }
2642
2643 void machines__destroy_guest_kernel_maps(struct rb_root *machines)
2644 {
2645         struct rb_node *next = rb_first(machines);
2646
2647         while (next) {
2648                 struct machine *pos = rb_entry(next, struct machine, rb_node);
2649
2650                 next = rb_next(&pos->rb_node);
2651                 rb_erase(&pos->rb_node, machines);
2652                 machine__delete(pos);
2653         }
2654 }
2655
2656 int machine__load_kallsyms(struct machine *machine, const char *filename,
2657                            enum map_type type, symbol_filter_t filter)
2658 {
2659         struct map *map = machine->vmlinux_maps[type];
2660         int ret = dso__load_kallsyms(map->dso, filename, map, filter);
2661
2662         if (ret > 0) {
2663                 dso__set_loaded(map->dso, type);
2664                 /*
2665                  * Since /proc/kallsyms will have multiple sessions for the
2666                  * kernel, with modules between them, fixup the end of all
2667                  * sections.
2668                  */
2669                 __map_groups__fixup_end(&machine->kmaps, type);
2670         }
2671
2672         return ret;
2673 }
2674
2675 int machine__load_vmlinux_path(struct machine *machine, enum map_type type,
2676                                symbol_filter_t filter)
2677 {
2678         struct map *map = machine->vmlinux_maps[type];
2679         int ret = dso__load_vmlinux_path(map->dso, map, filter);
2680
2681         if (ret > 0) {
2682                 dso__set_loaded(map->dso, type);
2683                 map__reloc_vmlinux(map);
2684         }
2685
2686         return ret;
2687 }