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