f40c076aeb7b0e705e53ac139d27ce5fa4379d8c
[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 "build-id.h"
15 #include "debug.h"
16 #include "symbol.h"
17 #include "strlist.h"
18
19 #include <libelf.h>
20 #include <gelf.h>
21 #include <elf.h>
22 #include <limits.h>
23 #include <sys/utsname.h>
24
25 #ifndef NT_GNU_BUILD_ID
26 #define NT_GNU_BUILD_ID 3
27 #endif
28
29 static bool dso__build_id_equal(const struct dso *self, u8 *build_id);
30 static int elf_read_build_id(Elf *elf, void *bf, size_t size);
31 static void dsos__add(struct list_head *head, struct dso *dso);
32 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type);
33 static int dso__load_kernel_sym(struct dso *self, struct map *map,
34                                 symbol_filter_t filter);
35 static int dso__load_guest_kernel_sym(struct dso *self, struct map *map,
36                         symbol_filter_t filter);
37 static int vmlinux_path__nr_entries;
38 static char **vmlinux_path;
39
40 struct symbol_conf symbol_conf = {
41         .exclude_other    = true,
42         .use_modules      = true,
43         .try_vmlinux_path = true,
44 };
45
46 int dso__name_len(const struct dso *self)
47 {
48         if (verbose)
49                 return self->long_name_len;
50
51         return self->short_name_len;
52 }
53
54 bool dso__loaded(const struct dso *self, enum map_type type)
55 {
56         return self->loaded & (1 << type);
57 }
58
59 bool dso__sorted_by_name(const struct dso *self, enum map_type type)
60 {
61         return self->sorted_by_name & (1 << type);
62 }
63
64 static void dso__set_sorted_by_name(struct dso *self, enum map_type type)
65 {
66         self->sorted_by_name |= (1 << type);
67 }
68
69 bool symbol_type__is_a(char symbol_type, enum map_type map_type)
70 {
71         switch (map_type) {
72         case MAP__FUNCTION:
73                 return symbol_type == 'T' || symbol_type == 'W';
74         case MAP__VARIABLE:
75                 return symbol_type == 'D' || symbol_type == 'd';
76         default:
77                 return false;
78         }
79 }
80
81 static void symbols__fixup_end(struct rb_root *self)
82 {
83         struct rb_node *nd, *prevnd = rb_first(self);
84         struct symbol *curr, *prev;
85
86         if (prevnd == NULL)
87                 return;
88
89         curr = rb_entry(prevnd, struct symbol, rb_node);
90
91         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
92                 prev = curr;
93                 curr = rb_entry(nd, struct symbol, rb_node);
94
95                 if (prev->end == prev->start)
96                         prev->end = curr->start - 1;
97         }
98
99         /* Last entry */
100         if (curr->end == curr->start)
101                 curr->end = roundup(curr->start, 4096);
102 }
103
104 static void __map_groups__fixup_end(struct map_groups *self, enum map_type type)
105 {
106         struct map *prev, *curr;
107         struct rb_node *nd, *prevnd = rb_first(&self->maps[type]);
108
109         if (prevnd == NULL)
110                 return;
111
112         curr = rb_entry(prevnd, struct map, rb_node);
113
114         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
115                 prev = curr;
116                 curr = rb_entry(nd, struct map, rb_node);
117                 prev->end = curr->start - 1;
118         }
119
120         /*
121          * We still haven't the actual symbols, so guess the
122          * last map final address.
123          */
124         curr->end = ~0ULL;
125 }
126
127 static void map_groups__fixup_end(struct map_groups *self)
128 {
129         int i;
130         for (i = 0; i < MAP__NR_TYPES; ++i)
131                 __map_groups__fixup_end(self, i);
132 }
133
134 static struct symbol *symbol__new(u64 start, u64 len, u8 binding,
135                                   const char *name)
136 {
137         size_t namelen = strlen(name) + 1;
138         struct symbol *self = calloc(1, (symbol_conf.priv_size +
139                                          sizeof(*self) + namelen));
140         if (self == NULL)
141                 return NULL;
142
143         if (symbol_conf.priv_size)
144                 self = ((void *)self) + symbol_conf.priv_size;
145
146         self->start   = start;
147         self->end     = len ? start + len - 1 : start;
148         self->binding = binding;
149         self->namelen = namelen - 1;
150
151         pr_debug4("%s: %s %#Lx-%#Lx\n", __func__, name, start, self->end);
152
153         memcpy(self->name, name, namelen);
154
155         return self;
156 }
157
158 void symbol__delete(struct symbol *self)
159 {
160         free(((void *)self) - symbol_conf.priv_size);
161 }
162
163 static size_t symbol__fprintf(struct symbol *self, FILE *fp)
164 {
165         return fprintf(fp, " %llx-%llx %c %s\n",
166                        self->start, self->end,
167                        self->binding == STB_GLOBAL ? 'g' :
168                        self->binding == STB_LOCAL  ? 'l' : 'w',
169                        self->name);
170 }
171
172 void dso__set_long_name(struct dso *self, char *name)
173 {
174         if (name == NULL)
175                 return;
176         self->long_name = name;
177         self->long_name_len = strlen(name);
178 }
179
180 static void dso__set_short_name(struct dso *self, const char *name)
181 {
182         if (name == NULL)
183                 return;
184         self->short_name = name;
185         self->short_name_len = strlen(name);
186 }
187
188 static void dso__set_basename(struct dso *self)
189 {
190         dso__set_short_name(self, basename(self->long_name));
191 }
192
193 struct dso *dso__new(const char *name)
194 {
195         struct dso *self = calloc(1, sizeof(*self) + strlen(name) + 1);
196
197         if (self != NULL) {
198                 int i;
199                 strcpy(self->name, name);
200                 dso__set_long_name(self, self->name);
201                 dso__set_short_name(self, self->name);
202                 for (i = 0; i < MAP__NR_TYPES; ++i)
203                         self->symbols[i] = self->symbol_names[i] = RB_ROOT;
204                 self->slen_calculated = 0;
205                 self->origin = DSO__ORIG_NOT_FOUND;
206                 self->loaded = 0;
207                 self->sorted_by_name = 0;
208                 self->has_build_id = 0;
209                 self->kernel = DSO_TYPE_USER;
210                 INIT_LIST_HEAD(&self->node);
211         }
212
213         return self;
214 }
215
216 static void symbols__delete(struct rb_root *self)
217 {
218         struct symbol *pos;
219         struct rb_node *next = rb_first(self);
220
221         while (next) {
222                 pos = rb_entry(next, struct symbol, rb_node);
223                 next = rb_next(&pos->rb_node);
224                 rb_erase(&pos->rb_node, self);
225                 symbol__delete(pos);
226         }
227 }
228
229 void dso__delete(struct dso *self)
230 {
231         int i;
232         for (i = 0; i < MAP__NR_TYPES; ++i)
233                 symbols__delete(&self->symbols[i]);
234         if (self->sname_alloc)
235                 free((char *)self->short_name);
236         if (self->lname_alloc)
237                 free(self->long_name);
238         free(self);
239 }
240
241 void dso__set_build_id(struct dso *self, void *build_id)
242 {
243         memcpy(self->build_id, build_id, sizeof(self->build_id));
244         self->has_build_id = 1;
245 }
246
247 static void symbols__insert(struct rb_root *self, struct symbol *sym)
248 {
249         struct rb_node **p = &self->rb_node;
250         struct rb_node *parent = NULL;
251         const u64 ip = sym->start;
252         struct symbol *s;
253
254         while (*p != NULL) {
255                 parent = *p;
256                 s = rb_entry(parent, struct symbol, rb_node);
257                 if (ip < s->start)
258                         p = &(*p)->rb_left;
259                 else
260                         p = &(*p)->rb_right;
261         }
262         rb_link_node(&sym->rb_node, parent, p);
263         rb_insert_color(&sym->rb_node, self);
264 }
265
266 static struct symbol *symbols__find(struct rb_root *self, u64 ip)
267 {
268         struct rb_node *n;
269
270         if (self == NULL)
271                 return NULL;
272
273         n = self->rb_node;
274
275         while (n) {
276                 struct symbol *s = rb_entry(n, struct symbol, rb_node);
277
278                 if (ip < s->start)
279                         n = n->rb_left;
280                 else if (ip > s->end)
281                         n = n->rb_right;
282                 else
283                         return s;
284         }
285
286         return NULL;
287 }
288
289 struct symbol_name_rb_node {
290         struct rb_node  rb_node;
291         struct symbol   sym;
292 };
293
294 static void symbols__insert_by_name(struct rb_root *self, struct symbol *sym)
295 {
296         struct rb_node **p = &self->rb_node;
297         struct rb_node *parent = NULL;
298         struct symbol_name_rb_node *symn, *s;
299
300         symn = container_of(sym, struct symbol_name_rb_node, sym);
301
302         while (*p != NULL) {
303                 parent = *p;
304                 s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
305                 if (strcmp(sym->name, s->sym.name) < 0)
306                         p = &(*p)->rb_left;
307                 else
308                         p = &(*p)->rb_right;
309         }
310         rb_link_node(&symn->rb_node, parent, p);
311         rb_insert_color(&symn->rb_node, self);
312 }
313
314 static void symbols__sort_by_name(struct rb_root *self, struct rb_root *source)
315 {
316         struct rb_node *nd;
317
318         for (nd = rb_first(source); nd; nd = rb_next(nd)) {
319                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
320                 symbols__insert_by_name(self, pos);
321         }
322 }
323
324 static struct symbol *symbols__find_by_name(struct rb_root *self, const char *name)
325 {
326         struct rb_node *n;
327
328         if (self == NULL)
329                 return NULL;
330
331         n = self->rb_node;
332
333         while (n) {
334                 struct symbol_name_rb_node *s;
335                 int cmp;
336
337                 s = rb_entry(n, struct symbol_name_rb_node, rb_node);
338                 cmp = strcmp(name, s->sym.name);
339
340                 if (cmp < 0)
341                         n = n->rb_left;
342                 else if (cmp > 0)
343                         n = n->rb_right;
344                 else
345                         return &s->sym;
346         }
347
348         return NULL;
349 }
350
351 struct symbol *dso__find_symbol(struct dso *self,
352                                 enum map_type type, u64 addr)
353 {
354         return symbols__find(&self->symbols[type], addr);
355 }
356
357 struct symbol *dso__find_symbol_by_name(struct dso *self, enum map_type type,
358                                         const char *name)
359 {
360         return symbols__find_by_name(&self->symbol_names[type], name);
361 }
362
363 void dso__sort_by_name(struct dso *self, enum map_type type)
364 {
365         dso__set_sorted_by_name(self, type);
366         return symbols__sort_by_name(&self->symbol_names[type],
367                                      &self->symbols[type]);
368 }
369
370 int build_id__sprintf(const u8 *self, int len, char *bf)
371 {
372         char *bid = bf;
373         const u8 *raw = self;
374         int i;
375
376         for (i = 0; i < len; ++i) {
377                 sprintf(bid, "%02x", *raw);
378                 ++raw;
379                 bid += 2;
380         }
381
382         return raw - self;
383 }
384
385 size_t dso__fprintf_buildid(struct dso *self, FILE *fp)
386 {
387         char sbuild_id[BUILD_ID_SIZE * 2 + 1];
388
389         build_id__sprintf(self->build_id, sizeof(self->build_id), sbuild_id);
390         return fprintf(fp, "%s", sbuild_id);
391 }
392
393 size_t dso__fprintf_symbols_by_name(struct dso *self, enum map_type type, FILE *fp)
394 {
395         size_t ret = 0;
396         struct rb_node *nd;
397         struct symbol_name_rb_node *pos;
398
399         for (nd = rb_first(&self->symbol_names[type]); nd; nd = rb_next(nd)) {
400                 pos = rb_entry(nd, struct symbol_name_rb_node, rb_node);
401                 fprintf(fp, "%s\n", pos->sym.name);
402         }
403
404         return ret;
405 }
406
407 size_t dso__fprintf(struct dso *self, enum map_type type, FILE *fp)
408 {
409         struct rb_node *nd;
410         size_t ret = fprintf(fp, "dso: %s (", self->short_name);
411
412         if (self->short_name != self->long_name)
413                 ret += fprintf(fp, "%s, ", self->long_name);
414         ret += fprintf(fp, "%s, %sloaded, ", map_type__name[type],
415                        self->loaded ? "" : "NOT ");
416         ret += dso__fprintf_buildid(self, fp);
417         ret += fprintf(fp, ")\n");
418         for (nd = rb_first(&self->symbols[type]); nd; nd = rb_next(nd)) {
419                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
420                 ret += symbol__fprintf(pos, fp);
421         }
422
423         return ret;
424 }
425
426 int kallsyms__parse(const char *filename, void *arg,
427                     int (*process_symbol)(void *arg, const char *name,
428                                                      char type, u64 start))
429 {
430         char *line = NULL;
431         size_t n;
432         int err = 0;
433         FILE *file = fopen(filename, "r");
434
435         if (file == NULL)
436                 goto out_failure;
437
438         while (!feof(file)) {
439                 u64 start;
440                 int line_len, len;
441                 char symbol_type;
442                 char *symbol_name;
443
444                 line_len = getline(&line, &n, file);
445                 if (line_len < 0 || !line)
446                         break;
447
448                 line[--line_len] = '\0'; /* \n */
449
450                 len = hex2u64(line, &start);
451
452                 len++;
453                 if (len + 2 >= line_len)
454                         continue;
455
456                 symbol_type = toupper(line[len]);
457                 symbol_name = line + len + 2;
458
459                 err = process_symbol(arg, symbol_name, symbol_type, start);
460                 if (err)
461                         break;
462         }
463
464         free(line);
465         fclose(file);
466         return err;
467
468 out_failure:
469         return -1;
470 }
471
472 struct process_kallsyms_args {
473         struct map *map;
474         struct dso *dso;
475 };
476
477 static u8 kallsyms2elf_type(char type)
478 {
479         if (type == 'W')
480                 return STB_WEAK;
481
482         return isupper(type) ? STB_GLOBAL : STB_LOCAL;
483 }
484
485 static int map__process_kallsym_symbol(void *arg, const char *name,
486                                        char type, u64 start)
487 {
488         struct symbol *sym;
489         struct process_kallsyms_args *a = arg;
490         struct rb_root *root = &a->dso->symbols[a->map->type];
491
492         if (!symbol_type__is_a(type, a->map->type))
493                 return 0;
494
495         /*
496          * Will fix up the end later, when we have all symbols sorted.
497          */
498         sym = symbol__new(start, 0, kallsyms2elf_type(type), name);
499
500         if (sym == NULL)
501                 return -ENOMEM;
502         /*
503          * We will pass the symbols to the filter later, in
504          * map__split_kallsyms, when we have split the maps per module
505          */
506         symbols__insert(root, sym);
507
508         return 0;
509 }
510
511 /*
512  * Loads the function entries in /proc/kallsyms into kernel_map->dso,
513  * so that we can in the next step set the symbol ->end address and then
514  * call kernel_maps__split_kallsyms.
515  */
516 static int dso__load_all_kallsyms(struct dso *self, const char *filename,
517                                   struct map *map)
518 {
519         struct process_kallsyms_args args = { .map = map, .dso = self, };
520         return kallsyms__parse(filename, &args, map__process_kallsym_symbol);
521 }
522
523 /*
524  * Split the symbols into maps, making sure there are no overlaps, i.e. the
525  * kernel range is broken in several maps, named [kernel].N, as we don't have
526  * the original ELF section names vmlinux have.
527  */
528 static int dso__split_kallsyms(struct dso *self, struct map *map,
529                                symbol_filter_t filter)
530 {
531         struct map_groups *kmaps = map__kmap(map)->kmaps;
532         struct machine *machine = kmaps->machine;
533         struct map *curr_map = map;
534         struct symbol *pos;
535         int count = 0;
536         struct rb_root *root = &self->symbols[map->type];
537         struct rb_node *next = rb_first(root);
538         int kernel_range = 0;
539
540         while (next) {
541                 char *module;
542
543                 pos = rb_entry(next, struct symbol, rb_node);
544                 next = rb_next(&pos->rb_node);
545
546                 module = strchr(pos->name, '\t');
547                 if (module) {
548                         if (!symbol_conf.use_modules)
549                                 goto discard_symbol;
550
551                         *module++ = '\0';
552
553                         if (strcmp(curr_map->dso->short_name, module)) {
554                                 if (curr_map != map &&
555                                     self->kernel == DSO_TYPE_GUEST_KERNEL &&
556                                     machine__is_default_guest(machine)) {
557                                         /*
558                                          * We assume all symbols of a module are
559                                          * continuous in * kallsyms, so curr_map
560                                          * points to a module and all its
561                                          * symbols are in its kmap. Mark it as
562                                          * loaded.
563                                          */
564                                         dso__set_loaded(curr_map->dso,
565                                                         curr_map->type);
566                                 }
567
568                                 curr_map = map_groups__find_by_name(kmaps,
569                                                         map->type, module);
570                                 if (curr_map == NULL) {
571                                         pr_debug("%s/proc/{kallsyms,modules} "
572                                                  "inconsistency while looking "
573                                                  "for \"%s\" module!\n",
574                                                  machine->root_dir, module);
575                                         curr_map = map;
576                                         goto discard_symbol;
577                                 }
578
579                                 if (curr_map->dso->loaded &&
580                                     !machine__is_default_guest(machine))
581                                         goto discard_symbol;
582                         }
583                         /*
584                          * So that we look just like we get from .ko files,
585                          * i.e. not prelinked, relative to map->start.
586                          */
587                         pos->start = curr_map->map_ip(curr_map, pos->start);
588                         pos->end   = curr_map->map_ip(curr_map, pos->end);
589                 } else if (curr_map != map) {
590                         char dso_name[PATH_MAX];
591                         struct dso *dso;
592
593                         if (self->kernel == DSO_TYPE_GUEST_KERNEL)
594                                 snprintf(dso_name, sizeof(dso_name),
595                                         "[guest.kernel].%d",
596                                         kernel_range++);
597                         else
598                                 snprintf(dso_name, sizeof(dso_name),
599                                         "[kernel].%d",
600                                         kernel_range++);
601
602                         dso = dso__new(dso_name);
603                         if (dso == NULL)
604                                 return -1;
605
606                         dso->kernel = self->kernel;
607
608                         curr_map = map__new2(pos->start, dso, map->type);
609                         if (curr_map == NULL) {
610                                 dso__delete(dso);
611                                 return -1;
612                         }
613
614                         curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
615                         map_groups__insert(kmaps, curr_map);
616                         ++kernel_range;
617                 }
618
619                 if (filter && filter(curr_map, pos)) {
620 discard_symbol:         rb_erase(&pos->rb_node, root);
621                         symbol__delete(pos);
622                 } else {
623                         if (curr_map != map) {
624                                 rb_erase(&pos->rb_node, root);
625                                 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
626                         }
627                         count++;
628                 }
629         }
630
631         if (curr_map != map &&
632             self->kernel == DSO_TYPE_GUEST_KERNEL &&
633             machine__is_default_guest(kmaps->machine)) {
634                 dso__set_loaded(curr_map->dso, curr_map->type);
635         }
636
637         return count;
638 }
639
640 int dso__load_kallsyms(struct dso *self, const char *filename,
641                        struct map *map, symbol_filter_t filter)
642 {
643         if (dso__load_all_kallsyms(self, filename, map) < 0)
644                 return -1;
645
646         symbols__fixup_end(&self->symbols[map->type]);
647         if (self->kernel == DSO_TYPE_GUEST_KERNEL)
648                 self->origin = DSO__ORIG_GUEST_KERNEL;
649         else
650                 self->origin = DSO__ORIG_KERNEL;
651
652         return dso__split_kallsyms(self, map, filter);
653 }
654
655 static int dso__load_perf_map(struct dso *self, struct map *map,
656                               symbol_filter_t filter)
657 {
658         char *line = NULL;
659         size_t n;
660         FILE *file;
661         int nr_syms = 0;
662
663         file = fopen(self->long_name, "r");
664         if (file == NULL)
665                 goto out_failure;
666
667         while (!feof(file)) {
668                 u64 start, size;
669                 struct symbol *sym;
670                 int line_len, len;
671
672                 line_len = getline(&line, &n, file);
673                 if (line_len < 0)
674                         break;
675
676                 if (!line)
677                         goto out_failure;
678
679                 line[--line_len] = '\0'; /* \n */
680
681                 len = hex2u64(line, &start);
682
683                 len++;
684                 if (len + 2 >= line_len)
685                         continue;
686
687                 len += hex2u64(line + len, &size);
688
689                 len++;
690                 if (len + 2 >= line_len)
691                         continue;
692
693                 sym = symbol__new(start, size, STB_GLOBAL, line + len);
694
695                 if (sym == NULL)
696                         goto out_delete_line;
697
698                 if (filter && filter(map, sym))
699                         symbol__delete(sym);
700                 else {
701                         symbols__insert(&self->symbols[map->type], sym);
702                         nr_syms++;
703                 }
704         }
705
706         free(line);
707         fclose(file);
708
709         return nr_syms;
710
711 out_delete_line:
712         free(line);
713 out_failure:
714         return -1;
715 }
716
717 /**
718  * elf_symtab__for_each_symbol - iterate thru all the symbols
719  *
720  * @self: struct elf_symtab instance to iterate
721  * @idx: uint32_t idx
722  * @sym: GElf_Sym iterator
723  */
724 #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
725         for (idx = 0, gelf_getsym(syms, idx, &sym);\
726              idx < nr_syms; \
727              idx++, gelf_getsym(syms, idx, &sym))
728
729 static inline uint8_t elf_sym__type(const GElf_Sym *sym)
730 {
731         return GELF_ST_TYPE(sym->st_info);
732 }
733
734 static inline int elf_sym__is_function(const GElf_Sym *sym)
735 {
736         return elf_sym__type(sym) == STT_FUNC &&
737                sym->st_name != 0 &&
738                sym->st_shndx != SHN_UNDEF;
739 }
740
741 static inline bool elf_sym__is_object(const GElf_Sym *sym)
742 {
743         return elf_sym__type(sym) == STT_OBJECT &&
744                 sym->st_name != 0 &&
745                 sym->st_shndx != SHN_UNDEF;
746 }
747
748 static inline int elf_sym__is_label(const GElf_Sym *sym)
749 {
750         return elf_sym__type(sym) == STT_NOTYPE &&
751                 sym->st_name != 0 &&
752                 sym->st_shndx != SHN_UNDEF &&
753                 sym->st_shndx != SHN_ABS;
754 }
755
756 static inline const char *elf_sec__name(const GElf_Shdr *shdr,
757                                         const Elf_Data *secstrs)
758 {
759         return secstrs->d_buf + shdr->sh_name;
760 }
761
762 static inline int elf_sec__is_text(const GElf_Shdr *shdr,
763                                         const Elf_Data *secstrs)
764 {
765         return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
766 }
767
768 static inline bool elf_sec__is_data(const GElf_Shdr *shdr,
769                                     const Elf_Data *secstrs)
770 {
771         return strstr(elf_sec__name(shdr, secstrs), "data") != NULL;
772 }
773
774 static inline const char *elf_sym__name(const GElf_Sym *sym,
775                                         const Elf_Data *symstrs)
776 {
777         return symstrs->d_buf + sym->st_name;
778 }
779
780 static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
781                                     GElf_Shdr *shp, const char *name,
782                                     size_t *idx)
783 {
784         Elf_Scn *sec = NULL;
785         size_t cnt = 1;
786
787         while ((sec = elf_nextscn(elf, sec)) != NULL) {
788                 char *str;
789
790                 gelf_getshdr(sec, shp);
791                 str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
792                 if (!strcmp(name, str)) {
793                         if (idx)
794                                 *idx = cnt;
795                         break;
796                 }
797                 ++cnt;
798         }
799
800         return sec;
801 }
802
803 #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
804         for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \
805              idx < nr_entries; \
806              ++idx, pos = gelf_getrel(reldata, idx, &pos_mem))
807
808 #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \
809         for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \
810              idx < nr_entries; \
811              ++idx, pos = gelf_getrela(reldata, idx, &pos_mem))
812
813 /*
814  * We need to check if we have a .dynsym, so that we can handle the
815  * .plt, synthesizing its symbols, that aren't on the symtabs (be it
816  * .dynsym or .symtab).
817  * And always look at the original dso, not at debuginfo packages, that
818  * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
819  */
820 static int dso__synthesize_plt_symbols(struct  dso *self, struct map *map,
821                                        symbol_filter_t filter)
822 {
823         uint32_t nr_rel_entries, idx;
824         GElf_Sym sym;
825         u64 plt_offset;
826         GElf_Shdr shdr_plt;
827         struct symbol *f;
828         GElf_Shdr shdr_rel_plt, shdr_dynsym;
829         Elf_Data *reldata, *syms, *symstrs;
830         Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym;
831         size_t dynsym_idx;
832         GElf_Ehdr ehdr;
833         char sympltname[1024];
834         Elf *elf;
835         int nr = 0, symidx, fd, err = 0;
836
837         fd = open(self->long_name, O_RDONLY);
838         if (fd < 0)
839                 goto out;
840
841         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
842         if (elf == NULL)
843                 goto out_close;
844
845         if (gelf_getehdr(elf, &ehdr) == NULL)
846                 goto out_elf_end;
847
848         scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym,
849                                          ".dynsym", &dynsym_idx);
850         if (scn_dynsym == NULL)
851                 goto out_elf_end;
852
853         scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
854                                           ".rela.plt", NULL);
855         if (scn_plt_rel == NULL) {
856                 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
857                                                   ".rel.plt", NULL);
858                 if (scn_plt_rel == NULL)
859                         goto out_elf_end;
860         }
861
862         err = -1;
863
864         if (shdr_rel_plt.sh_link != dynsym_idx)
865                 goto out_elf_end;
866
867         if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL)
868                 goto out_elf_end;
869
870         /*
871          * Fetch the relocation section to find the idxes to the GOT
872          * and the symbols in the .dynsym they refer to.
873          */
874         reldata = elf_getdata(scn_plt_rel, NULL);
875         if (reldata == NULL)
876                 goto out_elf_end;
877
878         syms = elf_getdata(scn_dynsym, NULL);
879         if (syms == NULL)
880                 goto out_elf_end;
881
882         scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link);
883         if (scn_symstrs == NULL)
884                 goto out_elf_end;
885
886         symstrs = elf_getdata(scn_symstrs, NULL);
887         if (symstrs == NULL)
888                 goto out_elf_end;
889
890         nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize;
891         plt_offset = shdr_plt.sh_offset;
892
893         if (shdr_rel_plt.sh_type == SHT_RELA) {
894                 GElf_Rela pos_mem, *pos;
895
896                 elf_section__for_each_rela(reldata, pos, pos_mem, idx,
897                                            nr_rel_entries) {
898                         symidx = GELF_R_SYM(pos->r_info);
899                         plt_offset += shdr_plt.sh_entsize;
900                         gelf_getsym(syms, symidx, &sym);
901                         snprintf(sympltname, sizeof(sympltname),
902                                  "%s@plt", elf_sym__name(&sym, symstrs));
903
904                         f = symbol__new(plt_offset, shdr_plt.sh_entsize,
905                                         STB_GLOBAL, sympltname);
906                         if (!f)
907                                 goto out_elf_end;
908
909                         if (filter && filter(map, f))
910                                 symbol__delete(f);
911                         else {
912                                 symbols__insert(&self->symbols[map->type], f);
913                                 ++nr;
914                         }
915                 }
916         } else if (shdr_rel_plt.sh_type == SHT_REL) {
917                 GElf_Rel pos_mem, *pos;
918                 elf_section__for_each_rel(reldata, pos, pos_mem, idx,
919                                           nr_rel_entries) {
920                         symidx = GELF_R_SYM(pos->r_info);
921                         plt_offset += shdr_plt.sh_entsize;
922                         gelf_getsym(syms, symidx, &sym);
923                         snprintf(sympltname, sizeof(sympltname),
924                                  "%s@plt", elf_sym__name(&sym, symstrs));
925
926                         f = symbol__new(plt_offset, shdr_plt.sh_entsize,
927                                         STB_GLOBAL, sympltname);
928                         if (!f)
929                                 goto out_elf_end;
930
931                         if (filter && filter(map, f))
932                                 symbol__delete(f);
933                         else {
934                                 symbols__insert(&self->symbols[map->type], f);
935                                 ++nr;
936                         }
937                 }
938         }
939
940         err = 0;
941 out_elf_end:
942         elf_end(elf);
943 out_close:
944         close(fd);
945
946         if (err == 0)
947                 return nr;
948 out:
949         pr_debug("%s: problems reading %s PLT info.\n",
950                  __func__, self->long_name);
951         return 0;
952 }
953
954 static bool elf_sym__is_a(GElf_Sym *self, enum map_type type)
955 {
956         switch (type) {
957         case MAP__FUNCTION:
958                 return elf_sym__is_function(self);
959         case MAP__VARIABLE:
960                 return elf_sym__is_object(self);
961         default:
962                 return false;
963         }
964 }
965
966 static bool elf_sec__is_a(GElf_Shdr *self, Elf_Data *secstrs, enum map_type type)
967 {
968         switch (type) {
969         case MAP__FUNCTION:
970                 return elf_sec__is_text(self, secstrs);
971         case MAP__VARIABLE:
972                 return elf_sec__is_data(self, secstrs);
973         default:
974                 return false;
975         }
976 }
977
978 static size_t elf_addr_to_index(Elf *elf, GElf_Addr addr)
979 {
980         Elf_Scn *sec = NULL;
981         GElf_Shdr shdr;
982         size_t cnt = 1;
983
984         while ((sec = elf_nextscn(elf, sec)) != NULL) {
985                 gelf_getshdr(sec, &shdr);
986
987                 if ((addr >= shdr.sh_addr) &&
988                     (addr < (shdr.sh_addr + shdr.sh_size)))
989                         return cnt;
990
991                 ++cnt;
992         }
993
994         return -1;
995 }
996
997 static int dso__load_sym(struct dso *self, struct map *map, const char *name,
998                          int fd, symbol_filter_t filter, int kmodule,
999                          int want_symtab)
1000 {
1001         struct kmap *kmap = self->kernel ? map__kmap(map) : NULL;
1002         struct map *curr_map = map;
1003         struct dso *curr_dso = self;
1004         Elf_Data *symstrs, *secstrs;
1005         uint32_t nr_syms;
1006         int err = -1;
1007         uint32_t idx;
1008         GElf_Ehdr ehdr;
1009         GElf_Shdr shdr, opdshdr;
1010         Elf_Data *syms, *opddata = NULL;
1011         GElf_Sym sym;
1012         Elf_Scn *sec, *sec_strndx, *opdsec;
1013         Elf *elf;
1014         int nr = 0;
1015         size_t opdidx = 0;
1016
1017         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1018         if (elf == NULL) {
1019                 pr_debug("%s: cannot read %s ELF file.\n", __func__, name);
1020                 goto out_close;
1021         }
1022
1023         if (gelf_getehdr(elf, &ehdr) == NULL) {
1024                 pr_debug("%s: cannot get elf header.\n", __func__);
1025                 goto out_elf_end;
1026         }
1027
1028         /* Always reject images with a mismatched build-id: */
1029         if (self->has_build_id) {
1030                 u8 build_id[BUILD_ID_SIZE];
1031
1032                 if (elf_read_build_id(elf, build_id,
1033                                       BUILD_ID_SIZE) != BUILD_ID_SIZE)
1034                         goto out_elf_end;
1035
1036                 if (!dso__build_id_equal(self, build_id))
1037                         goto out_elf_end;
1038         }
1039
1040         sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL);
1041         if (sec == NULL) {
1042                 if (want_symtab)
1043                         goto out_elf_end;
1044
1045                 sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL);
1046                 if (sec == NULL)
1047                         goto out_elf_end;
1048         }
1049
1050         opdsec = elf_section_by_name(elf, &ehdr, &opdshdr, ".opd", &opdidx);
1051         if (opdsec)
1052                 opddata = elf_rawdata(opdsec, NULL);
1053
1054         syms = elf_getdata(sec, NULL);
1055         if (syms == NULL)
1056                 goto out_elf_end;
1057
1058         sec = elf_getscn(elf, shdr.sh_link);
1059         if (sec == NULL)
1060                 goto out_elf_end;
1061
1062         symstrs = elf_getdata(sec, NULL);
1063         if (symstrs == NULL)
1064                 goto out_elf_end;
1065
1066         sec_strndx = elf_getscn(elf, ehdr.e_shstrndx);
1067         if (sec_strndx == NULL)
1068                 goto out_elf_end;
1069
1070         secstrs = elf_getdata(sec_strndx, NULL);
1071         if (secstrs == NULL)
1072                 goto out_elf_end;
1073
1074         nr_syms = shdr.sh_size / shdr.sh_entsize;
1075
1076         memset(&sym, 0, sizeof(sym));
1077         if (self->kernel == DSO_TYPE_USER) {
1078                 self->adjust_symbols = (ehdr.e_type == ET_EXEC ||
1079                                 elf_section_by_name(elf, &ehdr, &shdr,
1080                                                      ".gnu.prelink_undo",
1081                                                      NULL) != NULL);
1082         } else self->adjust_symbols = 0;
1083
1084         elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
1085                 struct symbol *f;
1086                 const char *elf_name = elf_sym__name(&sym, symstrs);
1087                 char *demangled = NULL;
1088                 int is_label = elf_sym__is_label(&sym);
1089                 const char *section_name;
1090
1091                 if (kmap && kmap->ref_reloc_sym && kmap->ref_reloc_sym->name &&
1092                     strcmp(elf_name, kmap->ref_reloc_sym->name) == 0)
1093                         kmap->ref_reloc_sym->unrelocated_addr = sym.st_value;
1094
1095                 if (!is_label && !elf_sym__is_a(&sym, map->type))
1096                         continue;
1097
1098                 /* Reject ARM ELF "mapping symbols": these aren't unique and
1099                  * don't identify functions, so will confuse the profile
1100                  * output: */
1101                 if (ehdr.e_machine == EM_ARM) {
1102                         if (!strcmp(elf_name, "$a") ||
1103                             !strcmp(elf_name, "$d") ||
1104                             !strcmp(elf_name, "$t"))
1105                                 continue;
1106                 }
1107
1108                 if (opdsec && sym.st_shndx == opdidx) {
1109                         u32 offset = sym.st_value - opdshdr.sh_addr;
1110                         u64 *opd = opddata->d_buf + offset;
1111                         sym.st_value = *opd;
1112                         sym.st_shndx = elf_addr_to_index(elf, sym.st_value);
1113                 }
1114
1115                 sec = elf_getscn(elf, sym.st_shndx);
1116                 if (!sec)
1117                         goto out_elf_end;
1118
1119                 gelf_getshdr(sec, &shdr);
1120
1121                 if (is_label && !elf_sec__is_a(&shdr, secstrs, map->type))
1122                         continue;
1123
1124                 section_name = elf_sec__name(&shdr, secstrs);
1125
1126                 if (self->kernel != DSO_TYPE_USER || kmodule) {
1127                         char dso_name[PATH_MAX];
1128
1129                         if (strcmp(section_name,
1130                                    (curr_dso->short_name +
1131                                     self->short_name_len)) == 0)
1132                                 goto new_symbol;
1133
1134                         if (strcmp(section_name, ".text") == 0) {
1135                                 curr_map = map;
1136                                 curr_dso = self;
1137                                 goto new_symbol;
1138                         }
1139
1140                         snprintf(dso_name, sizeof(dso_name),
1141                                  "%s%s", self->short_name, section_name);
1142
1143                         curr_map = map_groups__find_by_name(kmap->kmaps, map->type, dso_name);
1144                         if (curr_map == NULL) {
1145                                 u64 start = sym.st_value;
1146
1147                                 if (kmodule)
1148                                         start += map->start + shdr.sh_offset;
1149
1150                                 curr_dso = dso__new(dso_name);
1151                                 if (curr_dso == NULL)
1152                                         goto out_elf_end;
1153                                 curr_dso->kernel = self->kernel;
1154                                 curr_map = map__new2(start, curr_dso,
1155                                                      map->type);
1156                                 if (curr_map == NULL) {
1157                                         dso__delete(curr_dso);
1158                                         goto out_elf_end;
1159                                 }
1160                                 curr_map->map_ip = identity__map_ip;
1161                                 curr_map->unmap_ip = identity__map_ip;
1162                                 curr_dso->origin = self->origin;
1163                                 map_groups__insert(kmap->kmaps, curr_map);
1164                                 dsos__add(&self->node, curr_dso);
1165                                 dso__set_loaded(curr_dso, map->type);
1166                         } else
1167                                 curr_dso = curr_map->dso;
1168
1169                         goto new_symbol;
1170                 }
1171
1172                 if (curr_dso->adjust_symbols) {
1173                         pr_debug4("%s: adjusting symbol: st_value: %#Lx "
1174                                   "sh_addr: %#Lx sh_offset: %#Lx\n", __func__,
1175                                   (u64)sym.st_value, (u64)shdr.sh_addr,
1176                                   (u64)shdr.sh_offset);
1177                         sym.st_value -= shdr.sh_addr - shdr.sh_offset;
1178                 }
1179                 /*
1180                  * We need to figure out if the object was created from C++ sources
1181                  * DWARF DW_compile_unit has this, but we don't always have access
1182                  * to it...
1183                  */
1184                 demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI);
1185                 if (demangled != NULL)
1186                         elf_name = demangled;
1187 new_symbol:
1188                 f = symbol__new(sym.st_value, sym.st_size,
1189                                 GELF_ST_BIND(sym.st_info), elf_name);
1190                 free(demangled);
1191                 if (!f)
1192                         goto out_elf_end;
1193
1194                 if (filter && filter(curr_map, f))
1195                         symbol__delete(f);
1196                 else {
1197                         symbols__insert(&curr_dso->symbols[curr_map->type], f);
1198                         nr++;
1199                 }
1200         }
1201
1202         /*
1203          * For misannotated, zeroed, ASM function sizes.
1204          */
1205         if (nr > 0) {
1206                 symbols__fixup_end(&self->symbols[map->type]);
1207                 if (kmap) {
1208                         /*
1209                          * We need to fixup this here too because we create new
1210                          * maps here, for things like vsyscall sections.
1211                          */
1212                         __map_groups__fixup_end(kmap->kmaps, map->type);
1213                 }
1214         }
1215         err = nr;
1216 out_elf_end:
1217         elf_end(elf);
1218 out_close:
1219         return err;
1220 }
1221
1222 static bool dso__build_id_equal(const struct dso *self, u8 *build_id)
1223 {
1224         return memcmp(self->build_id, build_id, sizeof(self->build_id)) == 0;
1225 }
1226
1227 bool __dsos__read_build_ids(struct list_head *head, bool with_hits)
1228 {
1229         bool have_build_id = false;
1230         struct dso *pos;
1231
1232         list_for_each_entry(pos, head, node) {
1233                 if (with_hits && !pos->hit)
1234                         continue;
1235                 if (pos->has_build_id) {
1236                         have_build_id = true;
1237                         continue;
1238                 }
1239                 if (filename__read_build_id(pos->long_name, pos->build_id,
1240                                             sizeof(pos->build_id)) > 0) {
1241                         have_build_id     = true;
1242                         pos->has_build_id = true;
1243                 }
1244         }
1245
1246         return have_build_id;
1247 }
1248
1249 /*
1250  * Align offset to 4 bytes as needed for note name and descriptor data.
1251  */
1252 #define NOTE_ALIGN(n) (((n) + 3) & -4U)
1253
1254 static int elf_read_build_id(Elf *elf, void *bf, size_t size)
1255 {
1256         int err = -1;
1257         GElf_Ehdr ehdr;
1258         GElf_Shdr shdr;
1259         Elf_Data *data;
1260         Elf_Scn *sec;
1261         Elf_Kind ek;
1262         void *ptr;
1263
1264         if (size < BUILD_ID_SIZE)
1265                 goto out;
1266
1267         ek = elf_kind(elf);
1268         if (ek != ELF_K_ELF)
1269                 goto out;
1270
1271         if (gelf_getehdr(elf, &ehdr) == NULL) {
1272                 pr_err("%s: cannot get elf header.\n", __func__);
1273                 goto out;
1274         }
1275
1276         sec = elf_section_by_name(elf, &ehdr, &shdr,
1277                                   ".note.gnu.build-id", NULL);
1278         if (sec == NULL) {
1279                 sec = elf_section_by_name(elf, &ehdr, &shdr,
1280                                           ".notes", NULL);
1281                 if (sec == NULL)
1282                         goto out;
1283         }
1284
1285         data = elf_getdata(sec, NULL);
1286         if (data == NULL)
1287                 goto out;
1288
1289         ptr = data->d_buf;
1290         while (ptr < (data->d_buf + data->d_size)) {
1291                 GElf_Nhdr *nhdr = ptr;
1292                 int namesz = NOTE_ALIGN(nhdr->n_namesz),
1293                     descsz = NOTE_ALIGN(nhdr->n_descsz);
1294                 const char *name;
1295
1296                 ptr += sizeof(*nhdr);
1297                 name = ptr;
1298                 ptr += namesz;
1299                 if (nhdr->n_type == NT_GNU_BUILD_ID &&
1300                     nhdr->n_namesz == sizeof("GNU")) {
1301                         if (memcmp(name, "GNU", sizeof("GNU")) == 0) {
1302                                 memcpy(bf, ptr, BUILD_ID_SIZE);
1303                                 err = BUILD_ID_SIZE;
1304                                 break;
1305                         }
1306                 }
1307                 ptr += descsz;
1308         }
1309
1310 out:
1311         return err;
1312 }
1313
1314 int filename__read_build_id(const char *filename, void *bf, size_t size)
1315 {
1316         int fd, err = -1;
1317         Elf *elf;
1318
1319         if (size < BUILD_ID_SIZE)
1320                 goto out;
1321
1322         fd = open(filename, O_RDONLY);
1323         if (fd < 0)
1324                 goto out;
1325
1326         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1327         if (elf == NULL) {
1328                 pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename);
1329                 goto out_close;
1330         }
1331
1332         err = elf_read_build_id(elf, bf, size);
1333
1334         elf_end(elf);
1335 out_close:
1336         close(fd);
1337 out:
1338         return err;
1339 }
1340
1341 int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
1342 {
1343         int fd, err = -1;
1344
1345         if (size < BUILD_ID_SIZE)
1346                 goto out;
1347
1348         fd = open(filename, O_RDONLY);
1349         if (fd < 0)
1350                 goto out;
1351
1352         while (1) {
1353                 char bf[BUFSIZ];
1354                 GElf_Nhdr nhdr;
1355                 int namesz, descsz;
1356
1357                 if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr))
1358                         break;
1359
1360                 namesz = NOTE_ALIGN(nhdr.n_namesz);
1361                 descsz = NOTE_ALIGN(nhdr.n_descsz);
1362                 if (nhdr.n_type == NT_GNU_BUILD_ID &&
1363                     nhdr.n_namesz == sizeof("GNU")) {
1364                         if (read(fd, bf, namesz) != namesz)
1365                                 break;
1366                         if (memcmp(bf, "GNU", sizeof("GNU")) == 0) {
1367                                 if (read(fd, build_id,
1368                                     BUILD_ID_SIZE) == BUILD_ID_SIZE) {
1369                                         err = 0;
1370                                         break;
1371                                 }
1372                         } else if (read(fd, bf, descsz) != descsz)
1373                                 break;
1374                 } else {
1375                         int n = namesz + descsz;
1376                         if (read(fd, bf, n) != n)
1377                                 break;
1378                 }
1379         }
1380         close(fd);
1381 out:
1382         return err;
1383 }
1384
1385 char dso__symtab_origin(const struct dso *self)
1386 {
1387         static const char origin[] = {
1388                 [DSO__ORIG_KERNEL] =   'k',
1389                 [DSO__ORIG_JAVA_JIT] = 'j',
1390                 [DSO__ORIG_BUILD_ID_CACHE] = 'B',
1391                 [DSO__ORIG_FEDORA] =   'f',
1392                 [DSO__ORIG_UBUNTU] =   'u',
1393                 [DSO__ORIG_BUILDID] =  'b',
1394                 [DSO__ORIG_DSO] =      'd',
1395                 [DSO__ORIG_KMODULE] =  'K',
1396                 [DSO__ORIG_GUEST_KERNEL] =  'g',
1397                 [DSO__ORIG_GUEST_KMODULE] =  'G',
1398         };
1399
1400         if (self == NULL || self->origin == DSO__ORIG_NOT_FOUND)
1401                 return '!';
1402         return origin[self->origin];
1403 }
1404
1405 int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
1406 {
1407         int size = PATH_MAX;
1408         char *name;
1409         int ret = -1;
1410         int fd;
1411         struct machine *machine;
1412         const char *root_dir;
1413         int want_symtab;
1414
1415         dso__set_loaded(self, map->type);
1416
1417         if (self->kernel == DSO_TYPE_KERNEL)
1418                 return dso__load_kernel_sym(self, map, filter);
1419         else if (self->kernel == DSO_TYPE_GUEST_KERNEL)
1420                 return dso__load_guest_kernel_sym(self, map, filter);
1421
1422         if (map->groups && map->groups->machine)
1423                 machine = map->groups->machine;
1424         else
1425                 machine = NULL;
1426
1427         name = malloc(size);
1428         if (!name)
1429                 return -1;
1430
1431         self->adjust_symbols = 0;
1432
1433         if (strncmp(self->name, "/tmp/perf-", 10) == 0) {
1434                 ret = dso__load_perf_map(self, map, filter);
1435                 self->origin = ret > 0 ? DSO__ORIG_JAVA_JIT :
1436                                          DSO__ORIG_NOT_FOUND;
1437                 return ret;
1438         }
1439
1440         /* Iterate over candidate debug images.
1441          * On the first pass, only load images if they have a full symtab.
1442          * Failing that, do a second pass where we accept .dynsym also
1443          */
1444         for (self->origin = DSO__ORIG_BUILD_ID_CACHE, want_symtab = 1;
1445              self->origin != DSO__ORIG_NOT_FOUND;
1446              self->origin++) {
1447                 switch (self->origin) {
1448                 case DSO__ORIG_BUILD_ID_CACHE:
1449                         if (dso__build_id_filename(self, name, size) == NULL)
1450                                 continue;
1451                         break;
1452                 case DSO__ORIG_FEDORA:
1453                         snprintf(name, size, "/usr/lib/debug%s.debug",
1454                                  self->long_name);
1455                         break;
1456                 case DSO__ORIG_UBUNTU:
1457                         snprintf(name, size, "/usr/lib/debug%s",
1458                                  self->long_name);
1459                         break;
1460                 case DSO__ORIG_BUILDID: {
1461                         char build_id_hex[BUILD_ID_SIZE * 2 + 1];
1462
1463                         if (!self->has_build_id)
1464                                 continue;
1465
1466                         build_id__sprintf(self->build_id,
1467                                           sizeof(self->build_id),
1468                                           build_id_hex);
1469                         snprintf(name, size,
1470                                  "/usr/lib/debug/.build-id/%.2s/%s.debug",
1471                                  build_id_hex, build_id_hex + 2);
1472                         }
1473                         break;
1474                 case DSO__ORIG_DSO:
1475                         snprintf(name, size, "%s", self->long_name);
1476                         break;
1477                 case DSO__ORIG_GUEST_KMODULE:
1478                         if (map->groups && map->groups->machine)
1479                                 root_dir = map->groups->machine->root_dir;
1480                         else
1481                                 root_dir = "";
1482                         snprintf(name, size, "%s%s", root_dir, self->long_name);
1483                         break;
1484
1485                 default:
1486                         /*
1487                          * If we wanted a full symtab but no image had one,
1488                          * relax our requirements and repeat the search.
1489                          */
1490                         if (want_symtab) {
1491                                 want_symtab = 0;
1492                                 self->origin = DSO__ORIG_BUILD_ID_CACHE;
1493                         } else
1494                                 continue;
1495                 }
1496
1497                 /* Name is now the name of the next image to try */
1498                 fd = open(name, O_RDONLY);
1499                 if (fd < 0)
1500                         continue;
1501
1502                 ret = dso__load_sym(self, map, name, fd, filter, 0,
1503                                     want_symtab);
1504                 close(fd);
1505
1506                 /*
1507                  * Some people seem to have debuginfo files _WITHOUT_ debug
1508                  * info!?!?
1509                  */
1510                 if (!ret)
1511                         continue;
1512
1513                 if (ret > 0) {
1514                         int nr_plt = dso__synthesize_plt_symbols(self, map, filter);
1515                         if (nr_plt > 0)
1516                                 ret += nr_plt;
1517                         break;
1518                 }
1519         }
1520
1521         free(name);
1522         if (ret < 0 && strstr(self->name, " (deleted)") != NULL)
1523                 return 0;
1524         return ret;
1525 }
1526
1527 struct map *map_groups__find_by_name(struct map_groups *self,
1528                                      enum map_type type, const char *name)
1529 {
1530         struct rb_node *nd;
1531
1532         for (nd = rb_first(&self->maps[type]); nd; nd = rb_next(nd)) {
1533                 struct map *map = rb_entry(nd, struct map, rb_node);
1534
1535                 if (map->dso && strcmp(map->dso->short_name, name) == 0)
1536                         return map;
1537         }
1538
1539         return NULL;
1540 }
1541
1542 static int dso__kernel_module_get_build_id(struct dso *self,
1543                                 const char *root_dir)
1544 {
1545         char filename[PATH_MAX];
1546         /*
1547          * kernel module short names are of the form "[module]" and
1548          * we need just "module" here.
1549          */
1550         const char *name = self->short_name + 1;
1551
1552         snprintf(filename, sizeof(filename),
1553                  "%s/sys/module/%.*s/notes/.note.gnu.build-id",
1554                  root_dir, (int)strlen(name) - 1, name);
1555
1556         if (sysfs__read_build_id(filename, self->build_id,
1557                                  sizeof(self->build_id)) == 0)
1558                 self->has_build_id = true;
1559
1560         return 0;
1561 }
1562
1563 static int map_groups__set_modules_path_dir(struct map_groups *self,
1564                                 const char *dir_name)
1565 {
1566         struct dirent *dent;
1567         DIR *dir = opendir(dir_name);
1568         int ret = 0;
1569
1570         if (!dir) {
1571                 pr_debug("%s: cannot open %s dir\n", __func__, dir_name);
1572                 return -1;
1573         }
1574
1575         while ((dent = readdir(dir)) != NULL) {
1576                 char path[PATH_MAX];
1577                 struct stat st;
1578
1579                 /*sshfs might return bad dent->d_type, so we have to stat*/
1580                 sprintf(path, "%s/%s", dir_name, dent->d_name);
1581                 if (stat(path, &st))
1582                         continue;
1583
1584                 if (S_ISDIR(st.st_mode)) {
1585                         if (!strcmp(dent->d_name, ".") ||
1586                             !strcmp(dent->d_name, ".."))
1587                                 continue;
1588
1589                         snprintf(path, sizeof(path), "%s/%s",
1590                                  dir_name, dent->d_name);
1591                         ret = map_groups__set_modules_path_dir(self, path);
1592                         if (ret < 0)
1593                                 goto out;
1594                 } else {
1595                         char *dot = strrchr(dent->d_name, '.'),
1596                              dso_name[PATH_MAX];
1597                         struct map *map;
1598                         char *long_name;
1599
1600                         if (dot == NULL || strcmp(dot, ".ko"))
1601                                 continue;
1602                         snprintf(dso_name, sizeof(dso_name), "[%.*s]",
1603                                  (int)(dot - dent->d_name), dent->d_name);
1604
1605                         strxfrchar(dso_name, '-', '_');
1606                         map = map_groups__find_by_name(self, MAP__FUNCTION, dso_name);
1607                         if (map == NULL)
1608                                 continue;
1609
1610                         snprintf(path, sizeof(path), "%s/%s",
1611                                  dir_name, dent->d_name);
1612
1613                         long_name = strdup(path);
1614                         if (long_name == NULL) {
1615                                 ret = -1;
1616                                 goto out;
1617                         }
1618                         dso__set_long_name(map->dso, long_name);
1619                         map->dso->lname_alloc = 1;
1620                         dso__kernel_module_get_build_id(map->dso, "");
1621                 }
1622         }
1623
1624 out:
1625         closedir(dir);
1626         return ret;
1627 }
1628
1629 static char *get_kernel_version(const char *root_dir)
1630 {
1631         char version[PATH_MAX];
1632         FILE *file;
1633         char *name, *tmp;
1634         const char *prefix = "Linux version ";
1635
1636         sprintf(version, "%s/proc/version", root_dir);
1637         file = fopen(version, "r");
1638         if (!file)
1639                 return NULL;
1640
1641         version[0] = '\0';
1642         tmp = fgets(version, sizeof(version), file);
1643         fclose(file);
1644
1645         name = strstr(version, prefix);
1646         if (!name)
1647                 return NULL;
1648         name += strlen(prefix);
1649         tmp = strchr(name, ' ');
1650         if (tmp)
1651                 *tmp = '\0';
1652
1653         return strdup(name);
1654 }
1655
1656 static int machine__set_modules_path(struct machine *self)
1657 {
1658         char *version;
1659         char modules_path[PATH_MAX];
1660
1661         version = get_kernel_version(self->root_dir);
1662         if (!version)
1663                 return -1;
1664
1665         snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s/kernel",
1666                  self->root_dir, version);
1667         free(version);
1668
1669         return map_groups__set_modules_path_dir(&self->kmaps, modules_path);
1670 }
1671
1672 /*
1673  * Constructor variant for modules (where we know from /proc/modules where
1674  * they are loaded) and for vmlinux, where only after we load all the
1675  * symbols we'll know where it starts and ends.
1676  */
1677 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type)
1678 {
1679         struct map *self = calloc(1, (sizeof(*self) +
1680                                       (dso->kernel ? sizeof(struct kmap) : 0)));
1681         if (self != NULL) {
1682                 /*
1683                  * ->end will be filled after we load all the symbols
1684                  */
1685                 map__init(self, type, start, 0, 0, dso);
1686         }
1687
1688         return self;
1689 }
1690
1691 struct map *machine__new_module(struct machine *self, u64 start,
1692                                 const char *filename)
1693 {
1694         struct map *map;
1695         struct dso *dso = __dsos__findnew(&self->kernel_dsos, filename);
1696
1697         if (dso == NULL)
1698                 return NULL;
1699
1700         map = map__new2(start, dso, MAP__FUNCTION);
1701         if (map == NULL)
1702                 return NULL;
1703
1704         if (machine__is_host(self))
1705                 dso->origin = DSO__ORIG_KMODULE;
1706         else
1707                 dso->origin = DSO__ORIG_GUEST_KMODULE;
1708         map_groups__insert(&self->kmaps, map);
1709         return map;
1710 }
1711
1712 static int machine__create_modules(struct machine *self)
1713 {
1714         char *line = NULL;
1715         size_t n;
1716         FILE *file;
1717         struct map *map;
1718         const char *modules;
1719         char path[PATH_MAX];
1720
1721         if (machine__is_default_guest(self))
1722                 modules = symbol_conf.default_guest_modules;
1723         else {
1724                 sprintf(path, "%s/proc/modules", self->root_dir);
1725                 modules = path;
1726         }
1727
1728         file = fopen(modules, "r");
1729         if (file == NULL)
1730                 return -1;
1731
1732         while (!feof(file)) {
1733                 char name[PATH_MAX];
1734                 u64 start;
1735                 char *sep;
1736                 int line_len;
1737
1738                 line_len = getline(&line, &n, file);
1739                 if (line_len < 0)
1740                         break;
1741
1742                 if (!line)
1743                         goto out_failure;
1744
1745                 line[--line_len] = '\0'; /* \n */
1746
1747                 sep = strrchr(line, 'x');
1748                 if (sep == NULL)
1749                         continue;
1750
1751                 hex2u64(sep + 1, &start);
1752
1753                 sep = strchr(line, ' ');
1754                 if (sep == NULL)
1755                         continue;
1756
1757                 *sep = '\0';
1758
1759                 snprintf(name, sizeof(name), "[%s]", line);
1760                 map = machine__new_module(self, start, name);
1761                 if (map == NULL)
1762                         goto out_delete_line;
1763                 dso__kernel_module_get_build_id(map->dso, self->root_dir);
1764         }
1765
1766         free(line);
1767         fclose(file);
1768
1769         return machine__set_modules_path(self);
1770
1771 out_delete_line:
1772         free(line);
1773 out_failure:
1774         return -1;
1775 }
1776
1777 static int dso__load_vmlinux(struct dso *self, struct map *map,
1778                              const char *vmlinux, symbol_filter_t filter)
1779 {
1780         int err = -1, fd;
1781
1782         fd = open(vmlinux, O_RDONLY);
1783         if (fd < 0)
1784                 return -1;
1785
1786         dso__set_loaded(self, map->type);
1787         err = dso__load_sym(self, map, vmlinux, fd, filter, 0, 0);
1788         close(fd);
1789
1790         if (err > 0)
1791                 pr_debug("Using %s for symbols\n", vmlinux);
1792
1793         return err;
1794 }
1795
1796 int dso__load_vmlinux_path(struct dso *self, struct map *map,
1797                            symbol_filter_t filter)
1798 {
1799         int i, err = 0;
1800         char *filename;
1801
1802         pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1803                  vmlinux_path__nr_entries + 1);
1804
1805         filename = dso__build_id_filename(self, NULL, 0);
1806         if (filename != NULL) {
1807                 err = dso__load_vmlinux(self, map, filename, filter);
1808                 if (err > 0) {
1809                         dso__set_long_name(self, filename);
1810                         goto out;
1811                 }
1812                 free(filename);
1813         }
1814
1815         for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1816                 err = dso__load_vmlinux(self, map, vmlinux_path[i], filter);
1817                 if (err > 0) {
1818                         dso__set_long_name(self, strdup(vmlinux_path[i]));
1819                         break;
1820                 }
1821         }
1822 out:
1823         return err;
1824 }
1825
1826 static int dso__load_kernel_sym(struct dso *self, struct map *map,
1827                                 symbol_filter_t filter)
1828 {
1829         int err;
1830         const char *kallsyms_filename = NULL;
1831         char *kallsyms_allocated_filename = NULL;
1832         /*
1833          * Step 1: if the user specified a kallsyms or vmlinux filename, use
1834          * it and only it, reporting errors to the user if it cannot be used.
1835          *
1836          * For instance, try to analyse an ARM perf.data file _without_ a
1837          * build-id, or if the user specifies the wrong path to the right
1838          * vmlinux file, obviously we can't fallback to another vmlinux (a
1839          * x86_86 one, on the machine where analysis is being performed, say),
1840          * or worse, /proc/kallsyms.
1841          *
1842          * If the specified file _has_ a build-id and there is a build-id
1843          * section in the perf.data file, we will still do the expected
1844          * validation in dso__load_vmlinux and will bail out if they don't
1845          * match.
1846          */
1847         if (symbol_conf.kallsyms_name != NULL) {
1848                 kallsyms_filename = symbol_conf.kallsyms_name;
1849                 goto do_kallsyms;
1850         }
1851
1852         if (symbol_conf.vmlinux_name != NULL) {
1853                 err = dso__load_vmlinux(self, map,
1854                                         symbol_conf.vmlinux_name, filter);
1855                 if (err > 0) {
1856                         dso__set_long_name(self,
1857                                            strdup(symbol_conf.vmlinux_name));
1858                         goto out_fixup;
1859                 }
1860                 return err;
1861         }
1862
1863         if (vmlinux_path != NULL) {
1864                 err = dso__load_vmlinux_path(self, map, filter);
1865                 if (err > 0)
1866                         goto out_fixup;
1867         }
1868
1869         /*
1870          * Say the kernel DSO was created when processing the build-id header table,
1871          * we have a build-id, so check if it is the same as the running kernel,
1872          * using it if it is.
1873          */
1874         if (self->has_build_id) {
1875                 u8 kallsyms_build_id[BUILD_ID_SIZE];
1876                 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
1877
1878                 if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id,
1879                                          sizeof(kallsyms_build_id)) == 0) {
1880                         if (dso__build_id_equal(self, kallsyms_build_id)) {
1881                                 kallsyms_filename = "/proc/kallsyms";
1882                                 goto do_kallsyms;
1883                         }
1884                 }
1885                 /*
1886                  * Now look if we have it on the build-id cache in
1887                  * $HOME/.debug/[kernel.kallsyms].
1888                  */
1889                 build_id__sprintf(self->build_id, sizeof(self->build_id),
1890                                   sbuild_id);
1891
1892                 if (asprintf(&kallsyms_allocated_filename,
1893                              "%s/.debug/[kernel.kallsyms]/%s",
1894                              getenv("HOME"), sbuild_id) == -1) {
1895                         pr_err("Not enough memory for kallsyms file lookup\n");
1896                         return -1;
1897                 }
1898
1899                 kallsyms_filename = kallsyms_allocated_filename;
1900
1901                 if (access(kallsyms_filename, F_OK)) {
1902                         pr_err("No kallsyms or vmlinux with build-id %s "
1903                                "was found\n", sbuild_id);
1904                         free(kallsyms_allocated_filename);
1905                         return -1;
1906                 }
1907         } else {
1908                 /*
1909                  * Last resort, if we don't have a build-id and couldn't find
1910                  * any vmlinux file, try the running kernel kallsyms table.
1911                  */
1912                 kallsyms_filename = "/proc/kallsyms";
1913         }
1914
1915 do_kallsyms:
1916         err = dso__load_kallsyms(self, kallsyms_filename, map, filter);
1917         if (err > 0)
1918                 pr_debug("Using %s for symbols\n", kallsyms_filename);
1919         free(kallsyms_allocated_filename);
1920
1921         if (err > 0) {
1922 out_fixup:
1923                 if (kallsyms_filename != NULL)
1924                         dso__set_long_name(self, strdup("[kernel.kallsyms]"));
1925                 map__fixup_start(map);
1926                 map__fixup_end(map);
1927         }
1928
1929         return err;
1930 }
1931
1932 static int dso__load_guest_kernel_sym(struct dso *self, struct map *map,
1933                                 symbol_filter_t filter)
1934 {
1935         int err;
1936         const char *kallsyms_filename = NULL;
1937         struct machine *machine;
1938         char path[PATH_MAX];
1939
1940         if (!map->groups) {
1941                 pr_debug("Guest kernel map hasn't the point to groups\n");
1942                 return -1;
1943         }
1944         machine = map->groups->machine;
1945
1946         if (machine__is_default_guest(machine)) {
1947                 /*
1948                  * if the user specified a vmlinux filename, use it and only
1949                  * it, reporting errors to the user if it cannot be used.
1950                  * Or use file guest_kallsyms inputted by user on commandline
1951                  */
1952                 if (symbol_conf.default_guest_vmlinux_name != NULL) {
1953                         err = dso__load_vmlinux(self, map,
1954                                 symbol_conf.default_guest_vmlinux_name, filter);
1955                         goto out_try_fixup;
1956                 }
1957
1958                 kallsyms_filename = symbol_conf.default_guest_kallsyms;
1959                 if (!kallsyms_filename)
1960                         return -1;
1961         } else {
1962                 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
1963                 kallsyms_filename = path;
1964         }
1965
1966         err = dso__load_kallsyms(self, kallsyms_filename, map, filter);
1967         if (err > 0)
1968                 pr_debug("Using %s for symbols\n", kallsyms_filename);
1969
1970 out_try_fixup:
1971         if (err > 0) {
1972                 if (kallsyms_filename != NULL) {
1973                         machine__mmap_name(machine, path, sizeof(path));
1974                         dso__set_long_name(self, strdup(path));
1975                 }
1976                 map__fixup_start(map);
1977                 map__fixup_end(map);
1978         }
1979
1980         return err;
1981 }
1982
1983 static void dsos__add(struct list_head *head, struct dso *dso)
1984 {
1985         list_add_tail(&dso->node, head);
1986 }
1987
1988 static struct dso *dsos__find(struct list_head *head, const char *name)
1989 {
1990         struct dso *pos;
1991
1992         list_for_each_entry(pos, head, node)
1993                 if (strcmp(pos->long_name, name) == 0)
1994                         return pos;
1995         return NULL;
1996 }
1997
1998 struct dso *__dsos__findnew(struct list_head *head, const char *name)
1999 {
2000         struct dso *dso = dsos__find(head, name);
2001
2002         if (!dso) {
2003                 dso = dso__new(name);
2004                 if (dso != NULL) {
2005                         dsos__add(head, dso);
2006                         dso__set_basename(dso);
2007                 }
2008         }
2009
2010         return dso;
2011 }
2012
2013 size_t __dsos__fprintf(struct list_head *head, FILE *fp)
2014 {
2015         struct dso *pos;
2016         size_t ret = 0;
2017
2018         list_for_each_entry(pos, head, node) {
2019                 int i;
2020                 for (i = 0; i < MAP__NR_TYPES; ++i)
2021                         ret += dso__fprintf(pos, i, fp);
2022         }
2023
2024         return ret;
2025 }
2026
2027 size_t machines__fprintf_dsos(struct rb_root *self, FILE *fp)
2028 {
2029         struct rb_node *nd;
2030         size_t ret = 0;
2031
2032         for (nd = rb_first(self); nd; nd = rb_next(nd)) {
2033                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
2034                 ret += __dsos__fprintf(&pos->kernel_dsos, fp);
2035                 ret += __dsos__fprintf(&pos->user_dsos, fp);
2036         }
2037
2038         return ret;
2039 }
2040
2041 static size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp,
2042                                       bool with_hits)
2043 {
2044         struct dso *pos;
2045         size_t ret = 0;
2046
2047         list_for_each_entry(pos, head, node) {
2048                 if (with_hits && !pos->hit)
2049                         continue;
2050                 ret += dso__fprintf_buildid(pos, fp);
2051                 ret += fprintf(fp, " %s\n", pos->long_name);
2052         }
2053         return ret;
2054 }
2055
2056 size_t machine__fprintf_dsos_buildid(struct machine *self, FILE *fp, bool with_hits)
2057 {
2058         return __dsos__fprintf_buildid(&self->kernel_dsos, fp, with_hits) +
2059                __dsos__fprintf_buildid(&self->user_dsos, fp, with_hits);
2060 }
2061
2062 size_t machines__fprintf_dsos_buildid(struct rb_root *self, FILE *fp, bool with_hits)
2063 {
2064         struct rb_node *nd;
2065         size_t ret = 0;
2066
2067         for (nd = rb_first(self); nd; nd = rb_next(nd)) {
2068                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
2069                 ret += machine__fprintf_dsos_buildid(pos, fp, with_hits);
2070         }
2071         return ret;
2072 }
2073
2074 struct dso *dso__new_kernel(const char *name)
2075 {
2076         struct dso *self = dso__new(name ?: "[kernel.kallsyms]");
2077
2078         if (self != NULL) {
2079                 dso__set_short_name(self, "[kernel]");
2080                 self->kernel = DSO_TYPE_KERNEL;
2081         }
2082
2083         return self;
2084 }
2085
2086 static struct dso *dso__new_guest_kernel(struct machine *machine,
2087                                         const char *name)
2088 {
2089         char bf[PATH_MAX];
2090         struct dso *self = dso__new(name ?: machine__mmap_name(machine, bf, sizeof(bf)));
2091
2092         if (self != NULL) {
2093                 dso__set_short_name(self, "[guest.kernel]");
2094                 self->kernel = DSO_TYPE_GUEST_KERNEL;
2095         }
2096
2097         return self;
2098 }
2099
2100 void dso__read_running_kernel_build_id(struct dso *self, struct machine *machine)
2101 {
2102         char path[PATH_MAX];
2103
2104         if (machine__is_default_guest(machine))
2105                 return;
2106         sprintf(path, "%s/sys/kernel/notes", machine->root_dir);
2107         if (sysfs__read_build_id(path, self->build_id,
2108                                  sizeof(self->build_id)) == 0)
2109                 self->has_build_id = true;
2110 }
2111
2112 static struct dso *machine__create_kernel(struct machine *self)
2113 {
2114         const char *vmlinux_name = NULL;
2115         struct dso *kernel;
2116
2117         if (machine__is_host(self)) {
2118                 vmlinux_name = symbol_conf.vmlinux_name;
2119                 kernel = dso__new_kernel(vmlinux_name);
2120         } else {
2121                 if (machine__is_default_guest(self))
2122                         vmlinux_name = symbol_conf.default_guest_vmlinux_name;
2123                 kernel = dso__new_guest_kernel(self, vmlinux_name);
2124         }
2125
2126         if (kernel != NULL) {
2127                 dso__read_running_kernel_build_id(kernel, self);
2128                 dsos__add(&self->kernel_dsos, kernel);
2129         }
2130         return kernel;
2131 }
2132
2133 int __machine__create_kernel_maps(struct machine *self, struct dso *kernel)
2134 {
2135         enum map_type type;
2136
2137         for (type = 0; type < MAP__NR_TYPES; ++type) {
2138                 struct kmap *kmap;
2139
2140                 self->vmlinux_maps[type] = map__new2(0, kernel, type);
2141                 if (self->vmlinux_maps[type] == NULL)
2142                         return -1;
2143
2144                 self->vmlinux_maps[type]->map_ip =
2145                         self->vmlinux_maps[type]->unmap_ip = identity__map_ip;
2146
2147                 kmap = map__kmap(self->vmlinux_maps[type]);
2148                 kmap->kmaps = &self->kmaps;
2149                 map_groups__insert(&self->kmaps, self->vmlinux_maps[type]);
2150         }
2151
2152         return 0;
2153 }
2154
2155 void machine__destroy_kernel_maps(struct machine *self)
2156 {
2157         enum map_type type;
2158
2159         for (type = 0; type < MAP__NR_TYPES; ++type) {
2160                 struct kmap *kmap;
2161
2162                 if (self->vmlinux_maps[type] == NULL)
2163                         continue;
2164
2165                 kmap = map__kmap(self->vmlinux_maps[type]);
2166                 map_groups__remove(&self->kmaps, self->vmlinux_maps[type]);
2167                 if (kmap->ref_reloc_sym) {
2168                         /*
2169                          * ref_reloc_sym is shared among all maps, so free just
2170                          * on one of them.
2171                          */
2172                         if (type == MAP__FUNCTION) {
2173                                 free((char *)kmap->ref_reloc_sym->name);
2174                                 kmap->ref_reloc_sym->name = NULL;
2175                                 free(kmap->ref_reloc_sym);
2176                         }
2177                         kmap->ref_reloc_sym = NULL;
2178                 }
2179
2180                 map__delete(self->vmlinux_maps[type]);
2181                 self->vmlinux_maps[type] = NULL;
2182         }
2183 }
2184
2185 int machine__create_kernel_maps(struct machine *self)
2186 {
2187         struct dso *kernel = machine__create_kernel(self);
2188
2189         if (kernel == NULL ||
2190             __machine__create_kernel_maps(self, kernel) < 0)
2191                 return -1;
2192
2193         if (symbol_conf.use_modules && machine__create_modules(self) < 0)
2194                 pr_debug("Problems creating module maps, continuing anyway...\n");
2195         /*
2196          * Now that we have all the maps created, just set the ->end of them:
2197          */
2198         map_groups__fixup_end(&self->kmaps);
2199         return 0;
2200 }
2201
2202 static void vmlinux_path__exit(void)
2203 {
2204         while (--vmlinux_path__nr_entries >= 0) {
2205                 free(vmlinux_path[vmlinux_path__nr_entries]);
2206                 vmlinux_path[vmlinux_path__nr_entries] = NULL;
2207         }
2208
2209         free(vmlinux_path);
2210         vmlinux_path = NULL;
2211 }
2212
2213 static int vmlinux_path__init(void)
2214 {
2215         struct utsname uts;
2216         char bf[PATH_MAX];
2217
2218         if (uname(&uts) < 0)
2219                 return -1;
2220
2221         vmlinux_path = malloc(sizeof(char *) * 5);
2222         if (vmlinux_path == NULL)
2223                 return -1;
2224
2225         vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
2226         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2227                 goto out_fail;
2228         ++vmlinux_path__nr_entries;
2229         vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
2230         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2231                 goto out_fail;
2232         ++vmlinux_path__nr_entries;
2233         snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
2234         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2235         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2236                 goto out_fail;
2237         ++vmlinux_path__nr_entries;
2238         snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release);
2239         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2240         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2241                 goto out_fail;
2242         ++vmlinux_path__nr_entries;
2243         snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
2244                  uts.release);
2245         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2246         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2247                 goto out_fail;
2248         ++vmlinux_path__nr_entries;
2249
2250         return 0;
2251
2252 out_fail:
2253         vmlinux_path__exit();
2254         return -1;
2255 }
2256
2257 size_t machine__fprintf_vmlinux_path(struct machine *self, FILE *fp)
2258 {
2259         int i;
2260         size_t printed = 0;
2261         struct dso *kdso = self->vmlinux_maps[MAP__FUNCTION]->dso;
2262
2263         if (kdso->has_build_id) {
2264                 char filename[PATH_MAX];
2265                 if (dso__build_id_filename(kdso, filename, sizeof(filename)))
2266                         printed += fprintf(fp, "[0] %s\n", filename);
2267         }
2268
2269         for (i = 0; i < vmlinux_path__nr_entries; ++i)
2270                 printed += fprintf(fp, "[%d] %s\n",
2271                                    i + kdso->has_build_id, vmlinux_path[i]);
2272
2273         return printed;
2274 }
2275
2276 static int setup_list(struct strlist **list, const char *list_str,
2277                       const char *list_name)
2278 {
2279         if (list_str == NULL)
2280                 return 0;
2281
2282         *list = strlist__new(true, list_str);
2283         if (!*list) {
2284                 pr_err("problems parsing %s list\n", list_name);
2285                 return -1;
2286         }
2287         return 0;
2288 }
2289
2290 int symbol__init(void)
2291 {
2292         if (symbol_conf.initialized)
2293                 return 0;
2294
2295         elf_version(EV_CURRENT);
2296         if (symbol_conf.sort_by_name)
2297                 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
2298                                           sizeof(struct symbol));
2299
2300         if (symbol_conf.try_vmlinux_path && vmlinux_path__init() < 0)
2301                 return -1;
2302
2303         if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
2304                 pr_err("'.' is the only non valid --field-separator argument\n");
2305                 return -1;
2306         }
2307
2308         if (setup_list(&symbol_conf.dso_list,
2309                        symbol_conf.dso_list_str, "dso") < 0)
2310                 return -1;
2311
2312         if (setup_list(&symbol_conf.comm_list,
2313                        symbol_conf.comm_list_str, "comm") < 0)
2314                 goto out_free_dso_list;
2315
2316         if (setup_list(&symbol_conf.sym_list,
2317                        symbol_conf.sym_list_str, "symbol") < 0)
2318                 goto out_free_comm_list;
2319
2320         symbol_conf.initialized = true;
2321         return 0;
2322
2323 out_free_dso_list:
2324         strlist__delete(symbol_conf.dso_list);
2325 out_free_comm_list:
2326         strlist__delete(symbol_conf.comm_list);
2327         return -1;
2328 }
2329
2330 void symbol__exit(void)
2331 {
2332         if (!symbol_conf.initialized)
2333                 return;
2334         strlist__delete(symbol_conf.sym_list);
2335         strlist__delete(symbol_conf.dso_list);
2336         strlist__delete(symbol_conf.comm_list);
2337         vmlinux_path__exit();
2338         symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2339         symbol_conf.initialized = false;
2340 }
2341
2342 int machines__create_kernel_maps(struct rb_root *self, pid_t pid)
2343 {
2344         struct machine *machine = machines__findnew(self, pid);
2345
2346         if (machine == NULL)
2347                 return -1;
2348
2349         return machine__create_kernel_maps(machine);
2350 }
2351
2352 static int hex(char ch)
2353 {
2354         if ((ch >= '0') && (ch <= '9'))
2355                 return ch - '0';
2356         if ((ch >= 'a') && (ch <= 'f'))
2357                 return ch - 'a' + 10;
2358         if ((ch >= 'A') && (ch <= 'F'))
2359                 return ch - 'A' + 10;
2360         return -1;
2361 }
2362
2363 /*
2364  * While we find nice hex chars, build a long_val.
2365  * Return number of chars processed.
2366  */
2367 int hex2u64(const char *ptr, u64 *long_val)
2368 {
2369         const char *p = ptr;
2370         *long_val = 0;
2371
2372         while (*p) {
2373                 const int hex_val = hex(*p);
2374
2375                 if (hex_val < 0)
2376                         break;
2377
2378                 *long_val = (*long_val << 4) | hex_val;
2379                 p++;
2380         }
2381
2382         return p - ptr;
2383 }
2384
2385 char *strxfrchar(char *s, char from, char to)
2386 {
2387         char *p = s;
2388
2389         while ((p = strchr(p, from)) != NULL)
2390                 *p++ = to;
2391
2392         return s;
2393 }
2394
2395 int machines__create_guest_kernel_maps(struct rb_root *self)
2396 {
2397         int ret = 0;
2398         struct dirent **namelist = NULL;
2399         int i, items = 0;
2400         char path[PATH_MAX];
2401         pid_t pid;
2402
2403         if (symbol_conf.default_guest_vmlinux_name ||
2404             symbol_conf.default_guest_modules ||
2405             symbol_conf.default_guest_kallsyms) {
2406                 machines__create_kernel_maps(self, DEFAULT_GUEST_KERNEL_ID);
2407         }
2408
2409         if (symbol_conf.guestmount) {
2410                 items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL);
2411                 if (items <= 0)
2412                         return -ENOENT;
2413                 for (i = 0; i < items; i++) {
2414                         if (!isdigit(namelist[i]->d_name[0])) {
2415                                 /* Filter out . and .. */
2416                                 continue;
2417                         }
2418                         pid = atoi(namelist[i]->d_name);
2419                         sprintf(path, "%s/%s/proc/kallsyms",
2420                                 symbol_conf.guestmount,
2421                                 namelist[i]->d_name);
2422                         ret = access(path, R_OK);
2423                         if (ret) {
2424                                 pr_debug("Can't access file %s\n", path);
2425                                 goto failure;
2426                         }
2427                         machines__create_kernel_maps(self, pid);
2428                 }
2429 failure:
2430                 free(namelist);
2431         }
2432
2433         return ret;
2434 }
2435
2436 void machines__destroy_guest_kernel_maps(struct rb_root *self)
2437 {
2438         struct rb_node *next = rb_first(self);
2439
2440         while (next) {
2441                 struct machine *pos = rb_entry(next, struct machine, rb_node);
2442
2443                 next = rb_next(&pos->rb_node);
2444                 rb_erase(&pos->rb_node, self);
2445                 machine__delete(pos);
2446         }
2447 }
2448
2449 int machine__load_kallsyms(struct machine *self, const char *filename,
2450                            enum map_type type, symbol_filter_t filter)
2451 {
2452         struct map *map = self->vmlinux_maps[type];
2453         int ret = dso__load_kallsyms(map->dso, filename, map, filter);
2454
2455         if (ret > 0) {
2456                 dso__set_loaded(map->dso, type);
2457                 /*
2458                  * Since /proc/kallsyms will have multiple sessions for the
2459                  * kernel, with modules between them, fixup the end of all
2460                  * sections.
2461                  */
2462                 __map_groups__fixup_end(&self->kmaps, type);
2463         }
2464
2465         return ret;
2466 }
2467
2468 int machine__load_vmlinux_path(struct machine *self, enum map_type type,
2469                                symbol_filter_t filter)
2470 {
2471         struct map *map = self->vmlinux_maps[type];
2472         int ret = dso__load_vmlinux_path(map->dso, map, filter);
2473
2474         if (ret > 0) {
2475                 dso__set_loaded(map->dso, type);
2476                 map__reloc_vmlinux(map);
2477         }
2478
2479         return ret;
2480 }