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