perf symbols: Store the symbol binding
[linux-2.6.git] / tools / perf / util / symbol.c
1 #define _GNU_SOURCE
2 #include <ctype.h>
3 #include <dirent.h>
4 #include <errno.h>
5 #include <libgen.h>
6 #include <stdlib.h>
7 #include <stdio.h>
8 #include <string.h>
9 #include <sys/types.h>
10 #include <sys/stat.h>
11 #include <sys/param.h>
12 #include <fcntl.h>
13 #include <unistd.h>
14 #include "build-id.h"
15 #include "debug.h"
16 #include "symbol.h"
17 #include "strlist.h"
18
19 #include <libelf.h>
20 #include <gelf.h>
21 #include <elf.h>
22 #include <limits.h>
23 #include <sys/utsname.h>
24
25 #ifndef NT_GNU_BUILD_ID
26 #define NT_GNU_BUILD_ID 3
27 #endif
28
29 static bool dso__build_id_equal(const struct dso *self, u8 *build_id);
30 static int elf_read_build_id(Elf *elf, void *bf, size_t size);
31 static void dsos__add(struct list_head *head, struct dso *dso);
32 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type);
33 static int dso__load_kernel_sym(struct dso *self, struct map *map,
34                                 symbol_filter_t filter);
35 static int dso__load_guest_kernel_sym(struct dso *self, struct map *map,
36                         symbol_filter_t filter);
37 static int vmlinux_path__nr_entries;
38 static char **vmlinux_path;
39
40 struct symbol_conf symbol_conf = {
41         .exclude_other    = true,
42         .use_modules      = true,
43         .try_vmlinux_path = true,
44 };
45
46 int dso__name_len(const struct dso *self)
47 {
48         if (verbose)
49                 return self->long_name_len;
50
51         return self->short_name_len;
52 }
53
54 bool dso__loaded(const struct dso *self, enum map_type type)
55 {
56         return self->loaded & (1 << type);
57 }
58
59 bool dso__sorted_by_name(const struct dso *self, enum map_type type)
60 {
61         return self->sorted_by_name & (1 << type);
62 }
63
64 static void dso__set_sorted_by_name(struct dso *self, enum map_type type)
65 {
66         self->sorted_by_name |= (1 << type);
67 }
68
69 bool symbol_type__is_a(char symbol_type, enum map_type map_type)
70 {
71         switch (map_type) {
72         case MAP__FUNCTION:
73                 return symbol_type == 'T' || symbol_type == 'W';
74         case MAP__VARIABLE:
75                 return symbol_type == 'D' || symbol_type == 'd';
76         default:
77                 return false;
78         }
79 }
80
81 static void symbols__fixup_end(struct rb_root *self)
82 {
83         struct rb_node *nd, *prevnd = rb_first(self);
84         struct symbol *curr, *prev;
85
86         if (prevnd == NULL)
87                 return;
88
89         curr = rb_entry(prevnd, struct symbol, rb_node);
90
91         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
92                 prev = curr;
93                 curr = rb_entry(nd, struct symbol, rb_node);
94
95                 if (prev->end == prev->start)
96                         prev->end = curr->start - 1;
97         }
98
99         /* Last entry */
100         if (curr->end == curr->start)
101                 curr->end = roundup(curr->start, 4096);
102 }
103
104 static void __map_groups__fixup_end(struct map_groups *self, enum map_type type)
105 {
106         struct map *prev, *curr;
107         struct rb_node *nd, *prevnd = rb_first(&self->maps[type]);
108
109         if (prevnd == NULL)
110                 return;
111
112         curr = rb_entry(prevnd, struct map, rb_node);
113
114         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
115                 prev = curr;
116                 curr = rb_entry(nd, struct map, rb_node);
117                 prev->end = curr->start - 1;
118         }
119
120         /*
121          * We still haven't the actual symbols, so guess the
122          * last map final address.
123          */
124         curr->end = ~0UL;
125 }
126
127 static void map_groups__fixup_end(struct map_groups *self)
128 {
129         int i;
130         for (i = 0; i < MAP__NR_TYPES; ++i)
131                 __map_groups__fixup_end(self, i);
132 }
133
134 static struct symbol *symbol__new(u64 start, u64 len, u8 binding,
135                                   const char *name)
136 {
137         size_t namelen = strlen(name) + 1;
138         struct symbol *self = calloc(1, (symbol_conf.priv_size +
139                                          sizeof(*self) + namelen));
140         if (self == NULL)
141                 return NULL;
142
143         if (symbol_conf.priv_size)
144                 self = ((void *)self) + symbol_conf.priv_size;
145
146         self->start   = start;
147         self->end     = len ? start + len - 1 : start;
148         self->binding = binding;
149         self->namelen = namelen - 1;
150
151         pr_debug4("%s: %s %#Lx-%#Lx\n", __func__, name, start, self->end);
152
153         memcpy(self->name, name, namelen);
154
155         return self;
156 }
157
158 void symbol__delete(struct symbol *self)
159 {
160         free(((void *)self) - symbol_conf.priv_size);
161 }
162
163 static size_t symbol__fprintf(struct symbol *self, FILE *fp)
164 {
165         return fprintf(fp, " %llx-%llx %c %s\n",
166                        self->start, self->end,
167                        self->binding == STB_GLOBAL ? 'g' :
168                        self->binding == STB_LOCAL  ? 'l' : 'w',
169                        self->name);
170 }
171
172 void dso__set_long_name(struct dso *self, char *name)
173 {
174         if (name == NULL)
175                 return;
176         self->long_name = name;
177         self->long_name_len = strlen(name);
178 }
179
180 static void dso__set_short_name(struct dso *self, const char *name)
181 {
182         if (name == NULL)
183                 return;
184         self->short_name = name;
185         self->short_name_len = strlen(name);
186 }
187
188 static void dso__set_basename(struct dso *self)
189 {
190         dso__set_short_name(self, basename(self->long_name));
191 }
192
193 struct dso *dso__new(const char *name)
194 {
195         struct dso *self = calloc(1, sizeof(*self) + strlen(name) + 1);
196
197         if (self != NULL) {
198                 int i;
199                 strcpy(self->name, name);
200                 dso__set_long_name(self, self->name);
201                 dso__set_short_name(self, self->name);
202                 for (i = 0; i < MAP__NR_TYPES; ++i)
203                         self->symbols[i] = self->symbol_names[i] = RB_ROOT;
204                 self->slen_calculated = 0;
205                 self->origin = DSO__ORIG_NOT_FOUND;
206                 self->loaded = 0;
207                 self->sorted_by_name = 0;
208                 self->has_build_id = 0;
209                 self->kernel = DSO_TYPE_USER;
210                 INIT_LIST_HEAD(&self->node);
211         }
212
213         return self;
214 }
215
216 static void symbols__delete(struct rb_root *self)
217 {
218         struct symbol *pos;
219         struct rb_node *next = rb_first(self);
220
221         while (next) {
222                 pos = rb_entry(next, struct symbol, rb_node);
223                 next = rb_next(&pos->rb_node);
224                 rb_erase(&pos->rb_node, self);
225                 symbol__delete(pos);
226         }
227 }
228
229 void dso__delete(struct dso *self)
230 {
231         int i;
232         for (i = 0; i < MAP__NR_TYPES; ++i)
233                 symbols__delete(&self->symbols[i]);
234         if (self->sname_alloc)
235                 free((char *)self->short_name);
236         if (self->lname_alloc)
237                 free(self->long_name);
238         free(self);
239 }
240
241 void dso__set_build_id(struct dso *self, void *build_id)
242 {
243         memcpy(self->build_id, build_id, sizeof(self->build_id));
244         self->has_build_id = 1;
245 }
246
247 static void symbols__insert(struct rb_root *self, struct symbol *sym)
248 {
249         struct rb_node **p = &self->rb_node;
250         struct rb_node *parent = NULL;
251         const u64 ip = sym->start;
252         struct symbol *s;
253
254         while (*p != NULL) {
255                 parent = *p;
256                 s = rb_entry(parent, struct symbol, rb_node);
257                 if (ip < s->start)
258                         p = &(*p)->rb_left;
259                 else
260                         p = &(*p)->rb_right;
261         }
262         rb_link_node(&sym->rb_node, parent, p);
263         rb_insert_color(&sym->rb_node, self);
264 }
265
266 static struct symbol *symbols__find(struct rb_root *self, u64 ip)
267 {
268         struct rb_node *n;
269
270         if (self == NULL)
271                 return NULL;
272
273         n = self->rb_node;
274
275         while (n) {
276                 struct symbol *s = rb_entry(n, struct symbol, rb_node);
277
278                 if (ip < s->start)
279                         n = n->rb_left;
280                 else if (ip > s->end)
281                         n = n->rb_right;
282                 else
283                         return s;
284         }
285
286         return NULL;
287 }
288
289 struct symbol_name_rb_node {
290         struct rb_node  rb_node;
291         struct symbol   sym;
292 };
293
294 static void symbols__insert_by_name(struct rb_root *self, struct symbol *sym)
295 {
296         struct rb_node **p = &self->rb_node;
297         struct rb_node *parent = NULL;
298         struct symbol_name_rb_node *symn = ((void *)sym) - sizeof(*parent), *s;
299
300         while (*p != NULL) {
301                 parent = *p;
302                 s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
303                 if (strcmp(sym->name, s->sym.name) < 0)
304                         p = &(*p)->rb_left;
305                 else
306                         p = &(*p)->rb_right;
307         }
308         rb_link_node(&symn->rb_node, parent, p);
309         rb_insert_color(&symn->rb_node, self);
310 }
311
312 static void symbols__sort_by_name(struct rb_root *self, struct rb_root *source)
313 {
314         struct rb_node *nd;
315
316         for (nd = rb_first(source); nd; nd = rb_next(nd)) {
317                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
318                 symbols__insert_by_name(self, pos);
319         }
320 }
321
322 static struct symbol *symbols__find_by_name(struct rb_root *self, const char *name)
323 {
324         struct rb_node *n;
325
326         if (self == NULL)
327                 return NULL;
328
329         n = self->rb_node;
330
331         while (n) {
332                 struct symbol_name_rb_node *s;
333                 int cmp;
334
335                 s = rb_entry(n, struct symbol_name_rb_node, rb_node);
336                 cmp = strcmp(name, s->sym.name);
337
338                 if (cmp < 0)
339                         n = n->rb_left;
340                 else if (cmp > 0)
341                         n = n->rb_right;
342                 else
343                         return &s->sym;
344         }
345
346         return NULL;
347 }
348
349 struct symbol *dso__find_symbol(struct dso *self,
350                                 enum map_type type, u64 addr)
351 {
352         return symbols__find(&self->symbols[type], addr);
353 }
354
355 struct symbol *dso__find_symbol_by_name(struct dso *self, enum map_type type,
356                                         const char *name)
357 {
358         return symbols__find_by_name(&self->symbol_names[type], name);
359 }
360
361 void dso__sort_by_name(struct dso *self, enum map_type type)
362 {
363         dso__set_sorted_by_name(self, type);
364         return symbols__sort_by_name(&self->symbol_names[type],
365                                      &self->symbols[type]);
366 }
367
368 int build_id__sprintf(const u8 *self, int len, char *bf)
369 {
370         char *bid = bf;
371         const u8 *raw = self;
372         int i;
373
374         for (i = 0; i < len; ++i) {
375                 sprintf(bid, "%02x", *raw);
376                 ++raw;
377                 bid += 2;
378         }
379
380         return raw - self;
381 }
382
383 size_t dso__fprintf_buildid(struct dso *self, FILE *fp)
384 {
385         char sbuild_id[BUILD_ID_SIZE * 2 + 1];
386
387         build_id__sprintf(self->build_id, sizeof(self->build_id), sbuild_id);
388         return fprintf(fp, "%s", sbuild_id);
389 }
390
391 size_t dso__fprintf(struct dso *self, enum map_type type, FILE *fp)
392 {
393         struct rb_node *nd;
394         size_t ret = fprintf(fp, "dso: %s (", self->short_name);
395
396         if (self->short_name != self->long_name)
397                 ret += fprintf(fp, "%s, ", self->long_name);
398         ret += fprintf(fp, "%s, %sloaded, ", map_type__name[type],
399                        self->loaded ? "" : "NOT ");
400         ret += dso__fprintf_buildid(self, fp);
401         ret += fprintf(fp, ")\n");
402         for (nd = rb_first(&self->symbols[type]); nd; nd = rb_next(nd)) {
403                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
404                 ret += symbol__fprintf(pos, fp);
405         }
406
407         return ret;
408 }
409
410 int kallsyms__parse(const char *filename, void *arg,
411                     int (*process_symbol)(void *arg, const char *name,
412                                                      char type, u64 start))
413 {
414         char *line = NULL;
415         size_t n;
416         int err = 0;
417         FILE *file = fopen(filename, "r");
418
419         if (file == NULL)
420                 goto out_failure;
421
422         while (!feof(file)) {
423                 u64 start;
424                 int line_len, len;
425                 char symbol_type;
426                 char *symbol_name;
427
428                 line_len = getline(&line, &n, file);
429                 if (line_len < 0 || !line)
430                         break;
431
432                 line[--line_len] = '\0'; /* \n */
433
434                 len = hex2u64(line, &start);
435
436                 len++;
437                 if (len + 2 >= line_len)
438                         continue;
439
440                 symbol_type = toupper(line[len]);
441                 symbol_name = line + len + 2;
442
443                 err = process_symbol(arg, symbol_name, symbol_type, start);
444                 if (err)
445                         break;
446         }
447
448         free(line);
449         fclose(file);
450         return err;
451
452 out_failure:
453         return -1;
454 }
455
456 struct process_kallsyms_args {
457         struct map *map;
458         struct dso *dso;
459 };
460
461 static u8 kallsyms2elf_type(char type)
462 {
463         if (type == 'W')
464                 return STB_WEAK;
465
466         return isupper(type) ? STB_GLOBAL : STB_LOCAL;
467 }
468
469 static int map__process_kallsym_symbol(void *arg, const char *name,
470                                        char type, u64 start)
471 {
472         struct symbol *sym;
473         struct process_kallsyms_args *a = arg;
474         struct rb_root *root = &a->dso->symbols[a->map->type];
475
476         if (!symbol_type__is_a(type, a->map->type))
477                 return 0;
478
479         /*
480          * Will fix up the end later, when we have all symbols sorted.
481          */
482         sym = symbol__new(start, 0, kallsyms2elf_type(type), name);
483
484         if (sym == NULL)
485                 return -ENOMEM;
486         /*
487          * We will pass the symbols to the filter later, in
488          * map__split_kallsyms, when we have split the maps per module
489          */
490         symbols__insert(root, sym);
491
492         return 0;
493 }
494
495 /*
496  * Loads the function entries in /proc/kallsyms into kernel_map->dso,
497  * so that we can in the next step set the symbol ->end address and then
498  * call kernel_maps__split_kallsyms.
499  */
500 static int dso__load_all_kallsyms(struct dso *self, const char *filename,
501                                   struct map *map)
502 {
503         struct process_kallsyms_args args = { .map = map, .dso = self, };
504         return kallsyms__parse(filename, &args, map__process_kallsym_symbol);
505 }
506
507 /*
508  * Split the symbols into maps, making sure there are no overlaps, i.e. the
509  * kernel range is broken in several maps, named [kernel].N, as we don't have
510  * the original ELF section names vmlinux have.
511  */
512 static int dso__split_kallsyms(struct dso *self, struct map *map,
513                                symbol_filter_t filter)
514 {
515         struct map_groups *kmaps = map__kmap(map)->kmaps;
516         struct machine *machine = kmaps->machine;
517         struct map *curr_map = map;
518         struct symbol *pos;
519         int count = 0;
520         struct rb_root *root = &self->symbols[map->type];
521         struct rb_node *next = rb_first(root);
522         int kernel_range = 0;
523
524         while (next) {
525                 char *module;
526
527                 pos = rb_entry(next, struct symbol, rb_node);
528                 next = rb_next(&pos->rb_node);
529
530                 module = strchr(pos->name, '\t');
531                 if (module) {
532                         if (!symbol_conf.use_modules)
533                                 goto discard_symbol;
534
535                         *module++ = '\0';
536
537                         if (strcmp(curr_map->dso->short_name, module)) {
538                                 if (curr_map != map &&
539                                     self->kernel == DSO_TYPE_GUEST_KERNEL &&
540                                     machine__is_default_guest(machine)) {
541                                         /*
542                                          * We assume all symbols of a module are
543                                          * continuous in * kallsyms, so curr_map
544                                          * points to a module and all its
545                                          * symbols are in its kmap. Mark it as
546                                          * loaded.
547                                          */
548                                         dso__set_loaded(curr_map->dso,
549                                                         curr_map->type);
550                                 }
551
552                                 curr_map = map_groups__find_by_name(kmaps,
553                                                         map->type, module);
554                                 if (curr_map == NULL) {
555                                         pr_debug("%s/proc/{kallsyms,modules} "
556                                                  "inconsistency while looking "
557                                                  "for \"%s\" module!\n",
558                                                  machine->root_dir, module);
559                                         curr_map = map;
560                                         goto discard_symbol;
561                                 }
562
563                                 if (curr_map->dso->loaded &&
564                                     !machine__is_default_guest(machine))
565                                         goto discard_symbol;
566                         }
567                         /*
568                          * So that we look just like we get from .ko files,
569                          * i.e. not prelinked, relative to map->start.
570                          */
571                         pos->start = curr_map->map_ip(curr_map, pos->start);
572                         pos->end   = curr_map->map_ip(curr_map, pos->end);
573                 } else if (curr_map != map) {
574                         char dso_name[PATH_MAX];
575                         struct dso *dso;
576
577                         if (self->kernel == DSO_TYPE_GUEST_KERNEL)
578                                 snprintf(dso_name, sizeof(dso_name),
579                                         "[guest.kernel].%d",
580                                         kernel_range++);
581                         else
582                                 snprintf(dso_name, sizeof(dso_name),
583                                         "[kernel].%d",
584                                         kernel_range++);
585
586                         dso = dso__new(dso_name);
587                         if (dso == NULL)
588                                 return -1;
589
590                         dso->kernel = self->kernel;
591
592                         curr_map = map__new2(pos->start, dso, map->type);
593                         if (curr_map == NULL) {
594                                 dso__delete(dso);
595                                 return -1;
596                         }
597
598                         curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
599                         map_groups__insert(kmaps, curr_map);
600                         ++kernel_range;
601                 }
602
603                 if (filter && filter(curr_map, pos)) {
604 discard_symbol:         rb_erase(&pos->rb_node, root);
605                         symbol__delete(pos);
606                 } else {
607                         if (curr_map != map) {
608                                 rb_erase(&pos->rb_node, root);
609                                 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
610                         }
611                         count++;
612                 }
613         }
614
615         if (curr_map != map &&
616             self->kernel == DSO_TYPE_GUEST_KERNEL &&
617             machine__is_default_guest(kmaps->machine)) {
618                 dso__set_loaded(curr_map->dso, curr_map->type);
619         }
620
621         return count;
622 }
623
624 int dso__load_kallsyms(struct dso *self, const char *filename,
625                        struct map *map, symbol_filter_t filter)
626 {
627         if (dso__load_all_kallsyms(self, filename, map) < 0)
628                 return -1;
629
630         symbols__fixup_end(&self->symbols[map->type]);
631         if (self->kernel == DSO_TYPE_GUEST_KERNEL)
632                 self->origin = DSO__ORIG_GUEST_KERNEL;
633         else
634                 self->origin = DSO__ORIG_KERNEL;
635
636         return dso__split_kallsyms(self, map, filter);
637 }
638
639 static int dso__load_perf_map(struct dso *self, struct map *map,
640                               symbol_filter_t filter)
641 {
642         char *line = NULL;
643         size_t n;
644         FILE *file;
645         int nr_syms = 0;
646
647         file = fopen(self->long_name, "r");
648         if (file == NULL)
649                 goto out_failure;
650
651         while (!feof(file)) {
652                 u64 start, size;
653                 struct symbol *sym;
654                 int line_len, len;
655
656                 line_len = getline(&line, &n, file);
657                 if (line_len < 0)
658                         break;
659
660                 if (!line)
661                         goto out_failure;
662
663                 line[--line_len] = '\0'; /* \n */
664
665                 len = hex2u64(line, &start);
666
667                 len++;
668                 if (len + 2 >= line_len)
669                         continue;
670
671                 len += hex2u64(line + len, &size);
672
673                 len++;
674                 if (len + 2 >= line_len)
675                         continue;
676
677                 sym = symbol__new(start, size, STB_GLOBAL, line + len);
678
679                 if (sym == NULL)
680                         goto out_delete_line;
681
682                 if (filter && filter(map, sym))
683                         symbol__delete(sym);
684                 else {
685                         symbols__insert(&self->symbols[map->type], sym);
686                         nr_syms++;
687                 }
688         }
689
690         free(line);
691         fclose(file);
692
693         return nr_syms;
694
695 out_delete_line:
696         free(line);
697 out_failure:
698         return -1;
699 }
700
701 /**
702  * elf_symtab__for_each_symbol - iterate thru all the symbols
703  *
704  * @self: struct elf_symtab instance to iterate
705  * @idx: uint32_t idx
706  * @sym: GElf_Sym iterator
707  */
708 #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
709         for (idx = 0, gelf_getsym(syms, idx, &sym);\
710              idx < nr_syms; \
711              idx++, gelf_getsym(syms, idx, &sym))
712
713 static inline uint8_t elf_sym__type(const GElf_Sym *sym)
714 {
715         return GELF_ST_TYPE(sym->st_info);
716 }
717
718 static inline int elf_sym__is_function(const GElf_Sym *sym)
719 {
720         return elf_sym__type(sym) == STT_FUNC &&
721                sym->st_name != 0 &&
722                sym->st_shndx != SHN_UNDEF;
723 }
724
725 static inline bool elf_sym__is_object(const GElf_Sym *sym)
726 {
727         return elf_sym__type(sym) == STT_OBJECT &&
728                 sym->st_name != 0 &&
729                 sym->st_shndx != SHN_UNDEF;
730 }
731
732 static inline int elf_sym__is_label(const GElf_Sym *sym)
733 {
734         return elf_sym__type(sym) == STT_NOTYPE &&
735                 sym->st_name != 0 &&
736                 sym->st_shndx != SHN_UNDEF &&
737                 sym->st_shndx != SHN_ABS;
738 }
739
740 static inline const char *elf_sec__name(const GElf_Shdr *shdr,
741                                         const Elf_Data *secstrs)
742 {
743         return secstrs->d_buf + shdr->sh_name;
744 }
745
746 static inline int elf_sec__is_text(const GElf_Shdr *shdr,
747                                         const Elf_Data *secstrs)
748 {
749         return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
750 }
751
752 static inline bool elf_sec__is_data(const GElf_Shdr *shdr,
753                                     const Elf_Data *secstrs)
754 {
755         return strstr(elf_sec__name(shdr, secstrs), "data") != NULL;
756 }
757
758 static inline const char *elf_sym__name(const GElf_Sym *sym,
759                                         const Elf_Data *symstrs)
760 {
761         return symstrs->d_buf + sym->st_name;
762 }
763
764 static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
765                                     GElf_Shdr *shp, const char *name,
766                                     size_t *idx)
767 {
768         Elf_Scn *sec = NULL;
769         size_t cnt = 1;
770
771         while ((sec = elf_nextscn(elf, sec)) != NULL) {
772                 char *str;
773
774                 gelf_getshdr(sec, shp);
775                 str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
776                 if (!strcmp(name, str)) {
777                         if (idx)
778                                 *idx = cnt;
779                         break;
780                 }
781                 ++cnt;
782         }
783
784         return sec;
785 }
786
787 #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
788         for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \
789              idx < nr_entries; \
790              ++idx, pos = gelf_getrel(reldata, idx, &pos_mem))
791
792 #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \
793         for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \
794              idx < nr_entries; \
795              ++idx, pos = gelf_getrela(reldata, idx, &pos_mem))
796
797 /*
798  * We need to check if we have a .dynsym, so that we can handle the
799  * .plt, synthesizing its symbols, that aren't on the symtabs (be it
800  * .dynsym or .symtab).
801  * And always look at the original dso, not at debuginfo packages, that
802  * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
803  */
804 static int dso__synthesize_plt_symbols(struct  dso *self, struct map *map,
805                                        symbol_filter_t filter)
806 {
807         uint32_t nr_rel_entries, idx;
808         GElf_Sym sym;
809         u64 plt_offset;
810         GElf_Shdr shdr_plt;
811         struct symbol *f;
812         GElf_Shdr shdr_rel_plt, shdr_dynsym;
813         Elf_Data *reldata, *syms, *symstrs;
814         Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym;
815         size_t dynsym_idx;
816         GElf_Ehdr ehdr;
817         char sympltname[1024];
818         Elf *elf;
819         int nr = 0, symidx, fd, err = 0;
820
821         fd = open(self->long_name, O_RDONLY);
822         if (fd < 0)
823                 goto out;
824
825         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
826         if (elf == NULL)
827                 goto out_close;
828
829         if (gelf_getehdr(elf, &ehdr) == NULL)
830                 goto out_elf_end;
831
832         scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym,
833                                          ".dynsym", &dynsym_idx);
834         if (scn_dynsym == NULL)
835                 goto out_elf_end;
836
837         scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
838                                           ".rela.plt", NULL);
839         if (scn_plt_rel == NULL) {
840                 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
841                                                   ".rel.plt", NULL);
842                 if (scn_plt_rel == NULL)
843                         goto out_elf_end;
844         }
845
846         err = -1;
847
848         if (shdr_rel_plt.sh_link != dynsym_idx)
849                 goto out_elf_end;
850
851         if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL)
852                 goto out_elf_end;
853
854         /*
855          * Fetch the relocation section to find the idxes to the GOT
856          * and the symbols in the .dynsym they refer to.
857          */
858         reldata = elf_getdata(scn_plt_rel, NULL);
859         if (reldata == NULL)
860                 goto out_elf_end;
861
862         syms = elf_getdata(scn_dynsym, NULL);
863         if (syms == NULL)
864                 goto out_elf_end;
865
866         scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link);
867         if (scn_symstrs == NULL)
868                 goto out_elf_end;
869
870         symstrs = elf_getdata(scn_symstrs, NULL);
871         if (symstrs == NULL)
872                 goto out_elf_end;
873
874         nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize;
875         plt_offset = shdr_plt.sh_offset;
876
877         if (shdr_rel_plt.sh_type == SHT_RELA) {
878                 GElf_Rela pos_mem, *pos;
879
880                 elf_section__for_each_rela(reldata, pos, pos_mem, idx,
881                                            nr_rel_entries) {
882                         symidx = GELF_R_SYM(pos->r_info);
883                         plt_offset += shdr_plt.sh_entsize;
884                         gelf_getsym(syms, symidx, &sym);
885                         snprintf(sympltname, sizeof(sympltname),
886                                  "%s@plt", elf_sym__name(&sym, symstrs));
887
888                         f = symbol__new(plt_offset, shdr_plt.sh_entsize,
889                                         STB_GLOBAL, sympltname);
890                         if (!f)
891                                 goto out_elf_end;
892
893                         if (filter && filter(map, f))
894                                 symbol__delete(f);
895                         else {
896                                 symbols__insert(&self->symbols[map->type], f);
897                                 ++nr;
898                         }
899                 }
900         } else if (shdr_rel_plt.sh_type == SHT_REL) {
901                 GElf_Rel pos_mem, *pos;
902                 elf_section__for_each_rel(reldata, pos, pos_mem, idx,
903                                           nr_rel_entries) {
904                         symidx = GELF_R_SYM(pos->r_info);
905                         plt_offset += shdr_plt.sh_entsize;
906                         gelf_getsym(syms, symidx, &sym);
907                         snprintf(sympltname, sizeof(sympltname),
908                                  "%s@plt", elf_sym__name(&sym, symstrs));
909
910                         f = symbol__new(plt_offset, shdr_plt.sh_entsize,
911                                         STB_GLOBAL, sympltname);
912                         if (!f)
913                                 goto out_elf_end;
914
915                         if (filter && filter(map, f))
916                                 symbol__delete(f);
917                         else {
918                                 symbols__insert(&self->symbols[map->type], f);
919                                 ++nr;
920                         }
921                 }
922         }
923
924         err = 0;
925 out_elf_end:
926         elf_end(elf);
927 out_close:
928         close(fd);
929
930         if (err == 0)
931                 return nr;
932 out:
933         pr_debug("%s: problems reading %s PLT info.\n",
934                  __func__, self->long_name);
935         return 0;
936 }
937
938 static bool elf_sym__is_a(GElf_Sym *self, enum map_type type)
939 {
940         switch (type) {
941         case MAP__FUNCTION:
942                 return elf_sym__is_function(self);
943         case MAP__VARIABLE:
944                 return elf_sym__is_object(self);
945         default:
946                 return false;
947         }
948 }
949
950 static bool elf_sec__is_a(GElf_Shdr *self, Elf_Data *secstrs, enum map_type type)
951 {
952         switch (type) {
953         case MAP__FUNCTION:
954                 return elf_sec__is_text(self, secstrs);
955         case MAP__VARIABLE:
956                 return elf_sec__is_data(self, secstrs);
957         default:
958                 return false;
959         }
960 }
961
962 static size_t elf_addr_to_index(Elf *elf, GElf_Addr addr)
963 {
964         Elf_Scn *sec = NULL;
965         GElf_Shdr shdr;
966         size_t cnt = 1;
967
968         while ((sec = elf_nextscn(elf, sec)) != NULL) {
969                 gelf_getshdr(sec, &shdr);
970
971                 if ((addr >= shdr.sh_addr) &&
972                     (addr < (shdr.sh_addr + shdr.sh_size)))
973                         return cnt;
974
975                 ++cnt;
976         }
977
978         return -1;
979 }
980
981 static int dso__load_sym(struct dso *self, struct map *map, const char *name,
982                          int fd, symbol_filter_t filter, int kmodule,
983                          int want_symtab)
984 {
985         struct kmap *kmap = self->kernel ? map__kmap(map) : NULL;
986         struct map *curr_map = map;
987         struct dso *curr_dso = self;
988         Elf_Data *symstrs, *secstrs;
989         uint32_t nr_syms;
990         int err = -1;
991         uint32_t idx;
992         GElf_Ehdr ehdr;
993         GElf_Shdr shdr, opdshdr;
994         Elf_Data *syms, *opddata = NULL;
995         GElf_Sym sym;
996         Elf_Scn *sec, *sec_strndx, *opdsec;
997         Elf *elf;
998         int nr = 0;
999         size_t opdidx = 0;
1000
1001         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1002         if (elf == NULL) {
1003                 pr_debug("%s: cannot read %s ELF file.\n", __func__, name);
1004                 goto out_close;
1005         }
1006
1007         if (gelf_getehdr(elf, &ehdr) == NULL) {
1008                 pr_debug("%s: cannot get elf header.\n", __func__);
1009                 goto out_elf_end;
1010         }
1011
1012         /* Always reject images with a mismatched build-id: */
1013         if (self->has_build_id) {
1014                 u8 build_id[BUILD_ID_SIZE];
1015
1016                 if (elf_read_build_id(elf, build_id,
1017                                       BUILD_ID_SIZE) != BUILD_ID_SIZE)
1018                         goto out_elf_end;
1019
1020                 if (!dso__build_id_equal(self, build_id))
1021                         goto out_elf_end;
1022         }
1023
1024         sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL);
1025         if (sec == NULL) {
1026                 if (want_symtab)
1027                         goto out_elf_end;
1028
1029                 sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL);
1030                 if (sec == NULL)
1031                         goto out_elf_end;
1032         }
1033
1034         opdsec = elf_section_by_name(elf, &ehdr, &opdshdr, ".opd", &opdidx);
1035         if (opdsec)
1036                 opddata = elf_rawdata(opdsec, NULL);
1037
1038         syms = elf_getdata(sec, NULL);
1039         if (syms == NULL)
1040                 goto out_elf_end;
1041
1042         sec = elf_getscn(elf, shdr.sh_link);
1043         if (sec == NULL)
1044                 goto out_elf_end;
1045
1046         symstrs = elf_getdata(sec, NULL);
1047         if (symstrs == NULL)
1048                 goto out_elf_end;
1049
1050         sec_strndx = elf_getscn(elf, ehdr.e_shstrndx);
1051         if (sec_strndx == NULL)
1052                 goto out_elf_end;
1053
1054         secstrs = elf_getdata(sec_strndx, NULL);
1055         if (secstrs == NULL)
1056                 goto out_elf_end;
1057
1058         nr_syms = shdr.sh_size / shdr.sh_entsize;
1059
1060         memset(&sym, 0, sizeof(sym));
1061         if (self->kernel == DSO_TYPE_USER) {
1062                 self->adjust_symbols = (ehdr.e_type == ET_EXEC ||
1063                                 elf_section_by_name(elf, &ehdr, &shdr,
1064                                                      ".gnu.prelink_undo",
1065                                                      NULL) != NULL);
1066         } else self->adjust_symbols = 0;
1067
1068         elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
1069                 struct symbol *f;
1070                 const char *elf_name = elf_sym__name(&sym, symstrs);
1071                 char *demangled = NULL;
1072                 int is_label = elf_sym__is_label(&sym);
1073                 const char *section_name;
1074
1075                 if (kmap && kmap->ref_reloc_sym && kmap->ref_reloc_sym->name &&
1076                     strcmp(elf_name, kmap->ref_reloc_sym->name) == 0)
1077                         kmap->ref_reloc_sym->unrelocated_addr = sym.st_value;
1078
1079                 if (!is_label && !elf_sym__is_a(&sym, map->type))
1080                         continue;
1081
1082                 if (opdsec && sym.st_shndx == opdidx) {
1083                         u32 offset = sym.st_value - opdshdr.sh_addr;
1084                         u64 *opd = opddata->d_buf + offset;
1085                         sym.st_value = *opd;
1086                         sym.st_shndx = elf_addr_to_index(elf, sym.st_value);
1087                 }
1088
1089                 sec = elf_getscn(elf, sym.st_shndx);
1090                 if (!sec)
1091                         goto out_elf_end;
1092
1093                 gelf_getshdr(sec, &shdr);
1094
1095                 if (is_label && !elf_sec__is_a(&shdr, secstrs, map->type))
1096                         continue;
1097
1098                 section_name = elf_sec__name(&shdr, secstrs);
1099
1100                 if (self->kernel != DSO_TYPE_USER || kmodule) {
1101                         char dso_name[PATH_MAX];
1102
1103                         if (strcmp(section_name,
1104                                    (curr_dso->short_name +
1105                                     self->short_name_len)) == 0)
1106                                 goto new_symbol;
1107
1108                         if (strcmp(section_name, ".text") == 0) {
1109                                 curr_map = map;
1110                                 curr_dso = self;
1111                                 goto new_symbol;
1112                         }
1113
1114                         snprintf(dso_name, sizeof(dso_name),
1115                                  "%s%s", self->short_name, section_name);
1116
1117                         curr_map = map_groups__find_by_name(kmap->kmaps, map->type, dso_name);
1118                         if (curr_map == NULL) {
1119                                 u64 start = sym.st_value;
1120
1121                                 if (kmodule)
1122                                         start += map->start + shdr.sh_offset;
1123
1124                                 curr_dso = dso__new(dso_name);
1125                                 if (curr_dso == NULL)
1126                                         goto out_elf_end;
1127                                 curr_dso->kernel = self->kernel;
1128                                 curr_map = map__new2(start, curr_dso,
1129                                                      map->type);
1130                                 if (curr_map == NULL) {
1131                                         dso__delete(curr_dso);
1132                                         goto out_elf_end;
1133                                 }
1134                                 curr_map->map_ip = identity__map_ip;
1135                                 curr_map->unmap_ip = identity__map_ip;
1136                                 curr_dso->origin = self->origin;
1137                                 map_groups__insert(kmap->kmaps, curr_map);
1138                                 dsos__add(&self->node, curr_dso);
1139                                 dso__set_loaded(curr_dso, map->type);
1140                         } else
1141                                 curr_dso = curr_map->dso;
1142
1143                         goto new_symbol;
1144                 }
1145
1146                 if (curr_dso->adjust_symbols) {
1147                         pr_debug4("%s: adjusting symbol: st_value: %#Lx "
1148                                   "sh_addr: %#Lx sh_offset: %#Lx\n", __func__,
1149                                   (u64)sym.st_value, (u64)shdr.sh_addr,
1150                                   (u64)shdr.sh_offset);
1151                         sym.st_value -= shdr.sh_addr - shdr.sh_offset;
1152                 }
1153                 /*
1154                  * We need to figure out if the object was created from C++ sources
1155                  * DWARF DW_compile_unit has this, but we don't always have access
1156                  * to it...
1157                  */
1158                 demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI);
1159                 if (demangled != NULL)
1160                         elf_name = demangled;
1161 new_symbol:
1162                 f = symbol__new(sym.st_value, sym.st_size,
1163                                 GELF_ST_BIND(sym.st_info), elf_name);
1164                 free(demangled);
1165                 if (!f)
1166                         goto out_elf_end;
1167
1168                 if (filter && filter(curr_map, f))
1169                         symbol__delete(f);
1170                 else {
1171                         symbols__insert(&curr_dso->symbols[curr_map->type], f);
1172                         nr++;
1173                 }
1174         }
1175
1176         /*
1177          * For misannotated, zeroed, ASM function sizes.
1178          */
1179         if (nr > 0) {
1180                 symbols__fixup_end(&self->symbols[map->type]);
1181                 if (kmap) {
1182                         /*
1183                          * We need to fixup this here too because we create new
1184                          * maps here, for things like vsyscall sections.
1185                          */
1186                         __map_groups__fixup_end(kmap->kmaps, map->type);
1187                 }
1188         }
1189         err = nr;
1190 out_elf_end:
1191         elf_end(elf);
1192 out_close:
1193         return err;
1194 }
1195
1196 static bool dso__build_id_equal(const struct dso *self, u8 *build_id)
1197 {
1198         return memcmp(self->build_id, build_id, sizeof(self->build_id)) == 0;
1199 }
1200
1201 bool __dsos__read_build_ids(struct list_head *head, bool with_hits)
1202 {
1203         bool have_build_id = false;
1204         struct dso *pos;
1205
1206         list_for_each_entry(pos, head, node) {
1207                 if (with_hits && !pos->hit)
1208                         continue;
1209                 if (pos->has_build_id) {
1210                         have_build_id = true;
1211                         continue;
1212                 }
1213                 if (filename__read_build_id(pos->long_name, pos->build_id,
1214                                             sizeof(pos->build_id)) > 0) {
1215                         have_build_id     = true;
1216                         pos->has_build_id = true;
1217                 }
1218         }
1219
1220         return have_build_id;
1221 }
1222
1223 /*
1224  * Align offset to 4 bytes as needed for note name and descriptor data.
1225  */
1226 #define NOTE_ALIGN(n) (((n) + 3) & -4U)
1227
1228 static int elf_read_build_id(Elf *elf, void *bf, size_t size)
1229 {
1230         int err = -1;
1231         GElf_Ehdr ehdr;
1232         GElf_Shdr shdr;
1233         Elf_Data *data;
1234         Elf_Scn *sec;
1235         Elf_Kind ek;
1236         void *ptr;
1237
1238         if (size < BUILD_ID_SIZE)
1239                 goto out;
1240
1241         ek = elf_kind(elf);
1242         if (ek != ELF_K_ELF)
1243                 goto out;
1244
1245         if (gelf_getehdr(elf, &ehdr) == NULL) {
1246                 pr_err("%s: cannot get elf header.\n", __func__);
1247                 goto out;
1248         }
1249
1250         sec = elf_section_by_name(elf, &ehdr, &shdr,
1251                                   ".note.gnu.build-id", NULL);
1252         if (sec == NULL) {
1253                 sec = elf_section_by_name(elf, &ehdr, &shdr,
1254                                           ".notes", NULL);
1255                 if (sec == NULL)
1256                         goto out;
1257         }
1258
1259         data = elf_getdata(sec, NULL);
1260         if (data == NULL)
1261                 goto out;
1262
1263         ptr = data->d_buf;
1264         while (ptr < (data->d_buf + data->d_size)) {
1265                 GElf_Nhdr *nhdr = ptr;
1266                 int namesz = NOTE_ALIGN(nhdr->n_namesz),
1267                     descsz = NOTE_ALIGN(nhdr->n_descsz);
1268                 const char *name;
1269
1270                 ptr += sizeof(*nhdr);
1271                 name = ptr;
1272                 ptr += namesz;
1273                 if (nhdr->n_type == NT_GNU_BUILD_ID &&
1274                     nhdr->n_namesz == sizeof("GNU")) {
1275                         if (memcmp(name, "GNU", sizeof("GNU")) == 0) {
1276                                 memcpy(bf, ptr, BUILD_ID_SIZE);
1277                                 err = BUILD_ID_SIZE;
1278                                 break;
1279                         }
1280                 }
1281                 ptr += descsz;
1282         }
1283
1284 out:
1285         return err;
1286 }
1287
1288 int filename__read_build_id(const char *filename, void *bf, size_t size)
1289 {
1290         int fd, err = -1;
1291         Elf *elf;
1292
1293         if (size < BUILD_ID_SIZE)
1294                 goto out;
1295
1296         fd = open(filename, O_RDONLY);
1297         if (fd < 0)
1298                 goto out;
1299
1300         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1301         if (elf == NULL) {
1302                 pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename);
1303                 goto out_close;
1304         }
1305
1306         err = elf_read_build_id(elf, bf, size);
1307
1308         elf_end(elf);
1309 out_close:
1310         close(fd);
1311 out:
1312         return err;
1313 }
1314
1315 int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
1316 {
1317         int fd, err = -1;
1318
1319         if (size < BUILD_ID_SIZE)
1320                 goto out;
1321
1322         fd = open(filename, O_RDONLY);
1323         if (fd < 0)
1324                 goto out;
1325
1326         while (1) {
1327                 char bf[BUFSIZ];
1328                 GElf_Nhdr nhdr;
1329                 int namesz, descsz;
1330
1331                 if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr))
1332                         break;
1333
1334                 namesz = NOTE_ALIGN(nhdr.n_namesz);
1335                 descsz = NOTE_ALIGN(nhdr.n_descsz);
1336                 if (nhdr.n_type == NT_GNU_BUILD_ID &&
1337                     nhdr.n_namesz == sizeof("GNU")) {
1338                         if (read(fd, bf, namesz) != namesz)
1339                                 break;
1340                         if (memcmp(bf, "GNU", sizeof("GNU")) == 0) {
1341                                 if (read(fd, build_id,
1342                                     BUILD_ID_SIZE) == BUILD_ID_SIZE) {
1343                                         err = 0;
1344                                         break;
1345                                 }
1346                         } else if (read(fd, bf, descsz) != descsz)
1347                                 break;
1348                 } else {
1349                         int n = namesz + descsz;
1350                         if (read(fd, bf, n) != n)
1351                                 break;
1352                 }
1353         }
1354         close(fd);
1355 out:
1356         return err;
1357 }
1358
1359 char dso__symtab_origin(const struct dso *self)
1360 {
1361         static const char origin[] = {
1362                 [DSO__ORIG_KERNEL] =   'k',
1363                 [DSO__ORIG_JAVA_JIT] = 'j',
1364                 [DSO__ORIG_BUILD_ID_CACHE] = 'B',
1365                 [DSO__ORIG_FEDORA] =   'f',
1366                 [DSO__ORIG_UBUNTU] =   'u',
1367                 [DSO__ORIG_BUILDID] =  'b',
1368                 [DSO__ORIG_DSO] =      'd',
1369                 [DSO__ORIG_KMODULE] =  'K',
1370                 [DSO__ORIG_GUEST_KERNEL] =  'g',
1371                 [DSO__ORIG_GUEST_KMODULE] =  'G',
1372         };
1373
1374         if (self == NULL || self->origin == DSO__ORIG_NOT_FOUND)
1375                 return '!';
1376         return origin[self->origin];
1377 }
1378
1379 int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
1380 {
1381         int size = PATH_MAX;
1382         char *name;
1383         int ret = -1;
1384         int fd;
1385         struct machine *machine;
1386         const char *root_dir;
1387         int want_symtab;
1388
1389         dso__set_loaded(self, map->type);
1390
1391         if (self->kernel == DSO_TYPE_KERNEL)
1392                 return dso__load_kernel_sym(self, map, filter);
1393         else if (self->kernel == DSO_TYPE_GUEST_KERNEL)
1394                 return dso__load_guest_kernel_sym(self, map, filter);
1395
1396         if (map->groups && map->groups->machine)
1397                 machine = map->groups->machine;
1398         else
1399                 machine = NULL;
1400
1401         name = malloc(size);
1402         if (!name)
1403                 return -1;
1404
1405         self->adjust_symbols = 0;
1406
1407         if (strncmp(self->name, "/tmp/perf-", 10) == 0) {
1408                 ret = dso__load_perf_map(self, map, filter);
1409                 self->origin = ret > 0 ? DSO__ORIG_JAVA_JIT :
1410                                          DSO__ORIG_NOT_FOUND;
1411                 return ret;
1412         }
1413
1414         /* Iterate over candidate debug images.
1415          * On the first pass, only load images if they have a full symtab.
1416          * Failing that, do a second pass where we accept .dynsym also
1417          */
1418         for (self->origin = DSO__ORIG_BUILD_ID_CACHE, want_symtab = 1;
1419              self->origin != DSO__ORIG_NOT_FOUND;
1420              self->origin++) {
1421                 switch (self->origin) {
1422                 case DSO__ORIG_BUILD_ID_CACHE:
1423                         if (dso__build_id_filename(self, name, size) == NULL)
1424                                 continue;
1425                         break;
1426                 case DSO__ORIG_FEDORA:
1427                         snprintf(name, size, "/usr/lib/debug%s.debug",
1428                                  self->long_name);
1429                         break;
1430                 case DSO__ORIG_UBUNTU:
1431                         snprintf(name, size, "/usr/lib/debug%s",
1432                                  self->long_name);
1433                         break;
1434                 case DSO__ORIG_BUILDID: {
1435                         char build_id_hex[BUILD_ID_SIZE * 2 + 1];
1436
1437                         if (!self->has_build_id)
1438                                 continue;
1439
1440                         build_id__sprintf(self->build_id,
1441                                           sizeof(self->build_id),
1442                                           build_id_hex);
1443                         snprintf(name, size,
1444                                  "/usr/lib/debug/.build-id/%.2s/%s.debug",
1445                                  build_id_hex, build_id_hex + 2);
1446                         }
1447                         break;
1448                 case DSO__ORIG_DSO:
1449                         snprintf(name, size, "%s", self->long_name);
1450                         break;
1451                 case DSO__ORIG_GUEST_KMODULE:
1452                         if (map->groups && map->groups->machine)
1453                                 root_dir = map->groups->machine->root_dir;
1454                         else
1455                                 root_dir = "";
1456                         snprintf(name, size, "%s%s", root_dir, self->long_name);
1457                         break;
1458
1459                 default:
1460                         /*
1461                          * If we wanted a full symtab but no image had one,
1462                          * relax our requirements and repeat the search.
1463                          */
1464                         if (want_symtab) {
1465                                 want_symtab = 0;
1466                                 self->origin = DSO__ORIG_BUILD_ID_CACHE;
1467                         } else
1468                                 continue;
1469                 }
1470
1471                 /* Name is now the name of the next image to try */
1472                 fd = open(name, O_RDONLY);
1473                 if (fd < 0)
1474                         continue;
1475
1476                 ret = dso__load_sym(self, map, name, fd, filter, 0,
1477                                     want_symtab);
1478                 close(fd);
1479
1480                 /*
1481                  * Some people seem to have debuginfo files _WITHOUT_ debug
1482                  * info!?!?
1483                  */
1484                 if (!ret)
1485                         continue;
1486
1487                 if (ret > 0) {
1488                         int nr_plt = dso__synthesize_plt_symbols(self, map, filter);
1489                         if (nr_plt > 0)
1490                                 ret += nr_plt;
1491                         break;
1492                 }
1493         }
1494
1495         free(name);
1496         if (ret < 0 && strstr(self->name, " (deleted)") != NULL)
1497                 return 0;
1498         return ret;
1499 }
1500
1501 struct map *map_groups__find_by_name(struct map_groups *self,
1502                                      enum map_type type, const char *name)
1503 {
1504         struct rb_node *nd;
1505
1506         for (nd = rb_first(&self->maps[type]); nd; nd = rb_next(nd)) {
1507                 struct map *map = rb_entry(nd, struct map, rb_node);
1508
1509                 if (map->dso && strcmp(map->dso->short_name, name) == 0)
1510                         return map;
1511         }
1512
1513         return NULL;
1514 }
1515
1516 static int dso__kernel_module_get_build_id(struct dso *self,
1517                                 const char *root_dir)
1518 {
1519         char filename[PATH_MAX];
1520         /*
1521          * kernel module short names are of the form "[module]" and
1522          * we need just "module" here.
1523          */
1524         const char *name = self->short_name + 1;
1525
1526         snprintf(filename, sizeof(filename),
1527                  "%s/sys/module/%.*s/notes/.note.gnu.build-id",
1528                  root_dir, (int)strlen(name) - 1, name);
1529
1530         if (sysfs__read_build_id(filename, self->build_id,
1531                                  sizeof(self->build_id)) == 0)
1532                 self->has_build_id = true;
1533
1534         return 0;
1535 }
1536
1537 static int map_groups__set_modules_path_dir(struct map_groups *self,
1538                                 const char *dir_name)
1539 {
1540         struct dirent *dent;
1541         DIR *dir = opendir(dir_name);
1542         int ret = 0;
1543
1544         if (!dir) {
1545                 pr_debug("%s: cannot open %s dir\n", __func__, dir_name);
1546                 return -1;
1547         }
1548
1549         while ((dent = readdir(dir)) != NULL) {
1550                 char path[PATH_MAX];
1551                 struct stat st;
1552
1553                 /*sshfs might return bad dent->d_type, so we have to stat*/
1554                 sprintf(path, "%s/%s", dir_name, dent->d_name);
1555                 if (stat(path, &st))
1556                         continue;
1557
1558                 if (S_ISDIR(st.st_mode)) {
1559                         if (!strcmp(dent->d_name, ".") ||
1560                             !strcmp(dent->d_name, ".."))
1561                                 continue;
1562
1563                         snprintf(path, sizeof(path), "%s/%s",
1564                                  dir_name, dent->d_name);
1565                         ret = map_groups__set_modules_path_dir(self, path);
1566                         if (ret < 0)
1567                                 goto out;
1568                 } else {
1569                         char *dot = strrchr(dent->d_name, '.'),
1570                              dso_name[PATH_MAX];
1571                         struct map *map;
1572                         char *long_name;
1573
1574                         if (dot == NULL || strcmp(dot, ".ko"))
1575                                 continue;
1576                         snprintf(dso_name, sizeof(dso_name), "[%.*s]",
1577                                  (int)(dot - dent->d_name), dent->d_name);
1578
1579                         strxfrchar(dso_name, '-', '_');
1580                         map = map_groups__find_by_name(self, MAP__FUNCTION, dso_name);
1581                         if (map == NULL)
1582                                 continue;
1583
1584                         snprintf(path, sizeof(path), "%s/%s",
1585                                  dir_name, dent->d_name);
1586
1587                         long_name = strdup(path);
1588                         if (long_name == NULL) {
1589                                 ret = -1;
1590                                 goto out;
1591                         }
1592                         dso__set_long_name(map->dso, long_name);
1593                         map->dso->lname_alloc = 1;
1594                         dso__kernel_module_get_build_id(map->dso, "");
1595                 }
1596         }
1597
1598 out:
1599         closedir(dir);
1600         return ret;
1601 }
1602
1603 static char *get_kernel_version(const char *root_dir)
1604 {
1605         char version[PATH_MAX];
1606         FILE *file;
1607         char *name, *tmp;
1608         const char *prefix = "Linux version ";
1609
1610         sprintf(version, "%s/proc/version", root_dir);
1611         file = fopen(version, "r");
1612         if (!file)
1613                 return NULL;
1614
1615         version[0] = '\0';
1616         tmp = fgets(version, sizeof(version), file);
1617         fclose(file);
1618
1619         name = strstr(version, prefix);
1620         if (!name)
1621                 return NULL;
1622         name += strlen(prefix);
1623         tmp = strchr(name, ' ');
1624         if (tmp)
1625                 *tmp = '\0';
1626
1627         return strdup(name);
1628 }
1629
1630 static int machine__set_modules_path(struct machine *self)
1631 {
1632         char *version;
1633         char modules_path[PATH_MAX];
1634
1635         version = get_kernel_version(self->root_dir);
1636         if (!version)
1637                 return -1;
1638
1639         snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s/kernel",
1640                  self->root_dir, version);
1641         free(version);
1642
1643         return map_groups__set_modules_path_dir(&self->kmaps, modules_path);
1644 }
1645
1646 /*
1647  * Constructor variant for modules (where we know from /proc/modules where
1648  * they are loaded) and for vmlinux, where only after we load all the
1649  * symbols we'll know where it starts and ends.
1650  */
1651 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type)
1652 {
1653         struct map *self = calloc(1, (sizeof(*self) +
1654                                       (dso->kernel ? sizeof(struct kmap) : 0)));
1655         if (self != NULL) {
1656                 /*
1657                  * ->end will be filled after we load all the symbols
1658                  */
1659                 map__init(self, type, start, 0, 0, dso);
1660         }
1661
1662         return self;
1663 }
1664
1665 struct map *machine__new_module(struct machine *self, u64 start,
1666                                 const char *filename)
1667 {
1668         struct map *map;
1669         struct dso *dso = __dsos__findnew(&self->kernel_dsos, filename);
1670
1671         if (dso == NULL)
1672                 return NULL;
1673
1674         map = map__new2(start, dso, MAP__FUNCTION);
1675         if (map == NULL)
1676                 return NULL;
1677
1678         if (machine__is_host(self))
1679                 dso->origin = DSO__ORIG_KMODULE;
1680         else
1681                 dso->origin = DSO__ORIG_GUEST_KMODULE;
1682         map_groups__insert(&self->kmaps, map);
1683         return map;
1684 }
1685
1686 static int machine__create_modules(struct machine *self)
1687 {
1688         char *line = NULL;
1689         size_t n;
1690         FILE *file;
1691         struct map *map;
1692         const char *modules;
1693         char path[PATH_MAX];
1694
1695         if (machine__is_default_guest(self))
1696                 modules = symbol_conf.default_guest_modules;
1697         else {
1698                 sprintf(path, "%s/proc/modules", self->root_dir);
1699                 modules = path;
1700         }
1701
1702         file = fopen(modules, "r");
1703         if (file == NULL)
1704                 return -1;
1705
1706         while (!feof(file)) {
1707                 char name[PATH_MAX];
1708                 u64 start;
1709                 char *sep;
1710                 int line_len;
1711
1712                 line_len = getline(&line, &n, file);
1713                 if (line_len < 0)
1714                         break;
1715
1716                 if (!line)
1717                         goto out_failure;
1718
1719                 line[--line_len] = '\0'; /* \n */
1720
1721                 sep = strrchr(line, 'x');
1722                 if (sep == NULL)
1723                         continue;
1724
1725                 hex2u64(sep + 1, &start);
1726
1727                 sep = strchr(line, ' ');
1728                 if (sep == NULL)
1729                         continue;
1730
1731                 *sep = '\0';
1732
1733                 snprintf(name, sizeof(name), "[%s]", line);
1734                 map = machine__new_module(self, start, name);
1735                 if (map == NULL)
1736                         goto out_delete_line;
1737                 dso__kernel_module_get_build_id(map->dso, self->root_dir);
1738         }
1739
1740         free(line);
1741         fclose(file);
1742
1743         return machine__set_modules_path(self);
1744
1745 out_delete_line:
1746         free(line);
1747 out_failure:
1748         return -1;
1749 }
1750
1751 static int dso__load_vmlinux(struct dso *self, struct map *map,
1752                              const char *vmlinux, symbol_filter_t filter)
1753 {
1754         int err = -1, fd;
1755
1756         fd = open(vmlinux, O_RDONLY);
1757         if (fd < 0)
1758                 return -1;
1759
1760         dso__set_loaded(self, map->type);
1761         err = dso__load_sym(self, map, vmlinux, fd, filter, 0, 0);
1762         close(fd);
1763
1764         if (err > 0)
1765                 pr_debug("Using %s for symbols\n", vmlinux);
1766
1767         return err;
1768 }
1769
1770 int dso__load_vmlinux_path(struct dso *self, struct map *map,
1771                            symbol_filter_t filter)
1772 {
1773         int i, err = 0;
1774         char *filename;
1775
1776         pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1777                  vmlinux_path__nr_entries + 1);
1778
1779         filename = dso__build_id_filename(self, NULL, 0);
1780         if (filename != NULL) {
1781                 err = dso__load_vmlinux(self, map, filename, filter);
1782                 if (err > 0) {
1783                         dso__set_long_name(self, filename);
1784                         goto out;
1785                 }
1786                 free(filename);
1787         }
1788
1789         for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1790                 err = dso__load_vmlinux(self, map, vmlinux_path[i], filter);
1791                 if (err > 0) {
1792                         dso__set_long_name(self, strdup(vmlinux_path[i]));
1793                         break;
1794                 }
1795         }
1796 out:
1797         return err;
1798 }
1799
1800 static int dso__load_kernel_sym(struct dso *self, struct map *map,
1801                                 symbol_filter_t filter)
1802 {
1803         int err;
1804         const char *kallsyms_filename = NULL;
1805         char *kallsyms_allocated_filename = NULL;
1806         /*
1807          * Step 1: if the user specified a vmlinux filename, use it and only
1808          * it, reporting errors to the user if it cannot be used.
1809          *
1810          * For instance, try to analyse an ARM perf.data file _without_ a
1811          * build-id, or if the user specifies the wrong path to the right
1812          * vmlinux file, obviously we can't fallback to another vmlinux (a
1813          * x86_86 one, on the machine where analysis is being performed, say),
1814          * or worse, /proc/kallsyms.
1815          *
1816          * If the specified file _has_ a build-id and there is a build-id
1817          * section in the perf.data file, we will still do the expected
1818          * validation in dso__load_vmlinux and will bail out if they don't
1819          * match.
1820          */
1821         if (symbol_conf.vmlinux_name != NULL) {
1822                 err = dso__load_vmlinux(self, map,
1823                                         symbol_conf.vmlinux_name, filter);
1824                 if (err > 0) {
1825                         dso__set_long_name(self,
1826                                            strdup(symbol_conf.vmlinux_name));
1827                         goto out_fixup;
1828                 }
1829                 return err;
1830         }
1831
1832         if (vmlinux_path != NULL) {
1833                 err = dso__load_vmlinux_path(self, map, filter);
1834                 if (err > 0)
1835                         goto out_fixup;
1836         }
1837
1838         /*
1839          * Say the kernel DSO was created when processing the build-id header table,
1840          * we have a build-id, so check if it is the same as the running kernel,
1841          * using it if it is.
1842          */
1843         if (self->has_build_id) {
1844                 u8 kallsyms_build_id[BUILD_ID_SIZE];
1845                 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
1846
1847                 if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id,
1848                                          sizeof(kallsyms_build_id)) == 0) {
1849                         if (dso__build_id_equal(self, kallsyms_build_id)) {
1850                                 kallsyms_filename = "/proc/kallsyms";
1851                                 goto do_kallsyms;
1852                         }
1853                 }
1854                 /*
1855                  * Now look if we have it on the build-id cache in
1856                  * $HOME/.debug/[kernel.kallsyms].
1857                  */
1858                 build_id__sprintf(self->build_id, sizeof(self->build_id),
1859                                   sbuild_id);
1860
1861                 if (asprintf(&kallsyms_allocated_filename,
1862                              "%s/.debug/[kernel.kallsyms]/%s",
1863                              getenv("HOME"), sbuild_id) == -1) {
1864                         pr_err("Not enough memory for kallsyms file lookup\n");
1865                         return -1;
1866                 }
1867
1868                 kallsyms_filename = kallsyms_allocated_filename;
1869
1870                 if (access(kallsyms_filename, F_OK)) {
1871                         pr_err("No kallsyms or vmlinux with build-id %s "
1872                                "was found\n", sbuild_id);
1873                         free(kallsyms_allocated_filename);
1874                         return -1;
1875                 }
1876         } else {
1877                 /*
1878                  * Last resort, if we don't have a build-id and couldn't find
1879                  * any vmlinux file, try the running kernel kallsyms table.
1880                  */
1881                 kallsyms_filename = "/proc/kallsyms";
1882         }
1883
1884 do_kallsyms:
1885         err = dso__load_kallsyms(self, kallsyms_filename, map, filter);
1886         if (err > 0)
1887                 pr_debug("Using %s for symbols\n", kallsyms_filename);
1888         free(kallsyms_allocated_filename);
1889
1890         if (err > 0) {
1891 out_fixup:
1892                 if (kallsyms_filename != NULL)
1893                         dso__set_long_name(self, strdup("[kernel.kallsyms]"));
1894                 map__fixup_start(map);
1895                 map__fixup_end(map);
1896         }
1897
1898         return err;
1899 }
1900
1901 static int dso__load_guest_kernel_sym(struct dso *self, struct map *map,
1902                                 symbol_filter_t filter)
1903 {
1904         int err;
1905         const char *kallsyms_filename = NULL;
1906         struct machine *machine;
1907         char path[PATH_MAX];
1908
1909         if (!map->groups) {
1910                 pr_debug("Guest kernel map hasn't the point to groups\n");
1911                 return -1;
1912         }
1913         machine = map->groups->machine;
1914
1915         if (machine__is_default_guest(machine)) {
1916                 /*
1917                  * if the user specified a vmlinux filename, use it and only
1918                  * it, reporting errors to the user if it cannot be used.
1919                  * Or use file guest_kallsyms inputted by user on commandline
1920                  */
1921                 if (symbol_conf.default_guest_vmlinux_name != NULL) {
1922                         err = dso__load_vmlinux(self, map,
1923                                 symbol_conf.default_guest_vmlinux_name, filter);
1924                         goto out_try_fixup;
1925                 }
1926
1927                 kallsyms_filename = symbol_conf.default_guest_kallsyms;
1928                 if (!kallsyms_filename)
1929                         return -1;
1930         } else {
1931                 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
1932                 kallsyms_filename = path;
1933         }
1934
1935         err = dso__load_kallsyms(self, kallsyms_filename, map, filter);
1936         if (err > 0)
1937                 pr_debug("Using %s for symbols\n", kallsyms_filename);
1938
1939 out_try_fixup:
1940         if (err > 0) {
1941                 if (kallsyms_filename != NULL) {
1942                         machine__mmap_name(machine, path, sizeof(path));
1943                         dso__set_long_name(self, strdup(path));
1944                 }
1945                 map__fixup_start(map);
1946                 map__fixup_end(map);
1947         }
1948
1949         return err;
1950 }
1951
1952 static void dsos__add(struct list_head *head, struct dso *dso)
1953 {
1954         list_add_tail(&dso->node, head);
1955 }
1956
1957 static struct dso *dsos__find(struct list_head *head, const char *name)
1958 {
1959         struct dso *pos;
1960
1961         list_for_each_entry(pos, head, node)
1962                 if (strcmp(pos->long_name, name) == 0)
1963                         return pos;
1964         return NULL;
1965 }
1966
1967 struct dso *__dsos__findnew(struct list_head *head, const char *name)
1968 {
1969         struct dso *dso = dsos__find(head, name);
1970
1971         if (!dso) {
1972                 dso = dso__new(name);
1973                 if (dso != NULL) {
1974                         dsos__add(head, dso);
1975                         dso__set_basename(dso);
1976                 }
1977         }
1978
1979         return dso;
1980 }
1981
1982 size_t __dsos__fprintf(struct list_head *head, FILE *fp)
1983 {
1984         struct dso *pos;
1985         size_t ret = 0;
1986
1987         list_for_each_entry(pos, head, node) {
1988                 int i;
1989                 for (i = 0; i < MAP__NR_TYPES; ++i)
1990                         ret += dso__fprintf(pos, i, fp);
1991         }
1992
1993         return ret;
1994 }
1995
1996 size_t machines__fprintf_dsos(struct rb_root *self, FILE *fp)
1997 {
1998         struct rb_node *nd;
1999         size_t ret = 0;
2000
2001         for (nd = rb_first(self); nd; nd = rb_next(nd)) {
2002                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
2003                 ret += __dsos__fprintf(&pos->kernel_dsos, fp);
2004                 ret += __dsos__fprintf(&pos->user_dsos, fp);
2005         }
2006
2007         return ret;
2008 }
2009
2010 static size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp,
2011                                       bool with_hits)
2012 {
2013         struct dso *pos;
2014         size_t ret = 0;
2015
2016         list_for_each_entry(pos, head, node) {
2017                 if (with_hits && !pos->hit)
2018                         continue;
2019                 ret += dso__fprintf_buildid(pos, fp);
2020                 ret += fprintf(fp, " %s\n", pos->long_name);
2021         }
2022         return ret;
2023 }
2024
2025 size_t machine__fprintf_dsos_buildid(struct machine *self, FILE *fp, bool with_hits)
2026 {
2027         return __dsos__fprintf_buildid(&self->kernel_dsos, fp, with_hits) +
2028                __dsos__fprintf_buildid(&self->user_dsos, fp, with_hits);
2029 }
2030
2031 size_t machines__fprintf_dsos_buildid(struct rb_root *self, FILE *fp, bool with_hits)
2032 {
2033         struct rb_node *nd;
2034         size_t ret = 0;
2035
2036         for (nd = rb_first(self); nd; nd = rb_next(nd)) {
2037                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
2038                 ret += machine__fprintf_dsos_buildid(pos, fp, with_hits);
2039         }
2040         return ret;
2041 }
2042
2043 struct dso *dso__new_kernel(const char *name)
2044 {
2045         struct dso *self = dso__new(name ?: "[kernel.kallsyms]");
2046
2047         if (self != NULL) {
2048                 dso__set_short_name(self, "[kernel]");
2049                 self->kernel = DSO_TYPE_KERNEL;
2050         }
2051
2052         return self;
2053 }
2054
2055 static struct dso *dso__new_guest_kernel(struct machine *machine,
2056                                         const char *name)
2057 {
2058         char bf[PATH_MAX];
2059         struct dso *self = dso__new(name ?: machine__mmap_name(machine, bf, sizeof(bf)));
2060
2061         if (self != NULL) {
2062                 dso__set_short_name(self, "[guest.kernel]");
2063                 self->kernel = DSO_TYPE_GUEST_KERNEL;
2064         }
2065
2066         return self;
2067 }
2068
2069 void dso__read_running_kernel_build_id(struct dso *self, struct machine *machine)
2070 {
2071         char path[PATH_MAX];
2072
2073         if (machine__is_default_guest(machine))
2074                 return;
2075         sprintf(path, "%s/sys/kernel/notes", machine->root_dir);
2076         if (sysfs__read_build_id(path, self->build_id,
2077                                  sizeof(self->build_id)) == 0)
2078                 self->has_build_id = true;
2079 }
2080
2081 static struct dso *machine__create_kernel(struct machine *self)
2082 {
2083         const char *vmlinux_name = NULL;
2084         struct dso *kernel;
2085
2086         if (machine__is_host(self)) {
2087                 vmlinux_name = symbol_conf.vmlinux_name;
2088                 kernel = dso__new_kernel(vmlinux_name);
2089         } else {
2090                 if (machine__is_default_guest(self))
2091                         vmlinux_name = symbol_conf.default_guest_vmlinux_name;
2092                 kernel = dso__new_guest_kernel(self, vmlinux_name);
2093         }
2094
2095         if (kernel != NULL) {
2096                 dso__read_running_kernel_build_id(kernel, self);
2097                 dsos__add(&self->kernel_dsos, kernel);
2098         }
2099         return kernel;
2100 }
2101
2102 int __machine__create_kernel_maps(struct machine *self, struct dso *kernel)
2103 {
2104         enum map_type type;
2105
2106         for (type = 0; type < MAP__NR_TYPES; ++type) {
2107                 struct kmap *kmap;
2108
2109                 self->vmlinux_maps[type] = map__new2(0, kernel, type);
2110                 if (self->vmlinux_maps[type] == NULL)
2111                         return -1;
2112
2113                 self->vmlinux_maps[type]->map_ip =
2114                         self->vmlinux_maps[type]->unmap_ip = identity__map_ip;
2115
2116                 kmap = map__kmap(self->vmlinux_maps[type]);
2117                 kmap->kmaps = &self->kmaps;
2118                 map_groups__insert(&self->kmaps, self->vmlinux_maps[type]);
2119         }
2120
2121         return 0;
2122 }
2123
2124 void machine__destroy_kernel_maps(struct machine *self)
2125 {
2126         enum map_type type;
2127
2128         for (type = 0; type < MAP__NR_TYPES; ++type) {
2129                 struct kmap *kmap;
2130
2131                 if (self->vmlinux_maps[type] == NULL)
2132                         continue;
2133
2134                 kmap = map__kmap(self->vmlinux_maps[type]);
2135                 map_groups__remove(&self->kmaps, self->vmlinux_maps[type]);
2136                 if (kmap->ref_reloc_sym) {
2137                         /*
2138                          * ref_reloc_sym is shared among all maps, so free just
2139                          * on one of them.
2140                          */
2141                         if (type == MAP__FUNCTION) {
2142                                 free((char *)kmap->ref_reloc_sym->name);
2143                                 kmap->ref_reloc_sym->name = NULL;
2144                                 free(kmap->ref_reloc_sym);
2145                         }
2146                         kmap->ref_reloc_sym = NULL;
2147                 }
2148
2149                 map__delete(self->vmlinux_maps[type]);
2150                 self->vmlinux_maps[type] = NULL;
2151         }
2152 }
2153
2154 int machine__create_kernel_maps(struct machine *self)
2155 {
2156         struct dso *kernel = machine__create_kernel(self);
2157
2158         if (kernel == NULL ||
2159             __machine__create_kernel_maps(self, kernel) < 0)
2160                 return -1;
2161
2162         if (symbol_conf.use_modules && machine__create_modules(self) < 0)
2163                 pr_debug("Problems creating module maps, continuing anyway...\n");
2164         /*
2165          * Now that we have all the maps created, just set the ->end of them:
2166          */
2167         map_groups__fixup_end(&self->kmaps);
2168         return 0;
2169 }
2170
2171 static void vmlinux_path__exit(void)
2172 {
2173         while (--vmlinux_path__nr_entries >= 0) {
2174                 free(vmlinux_path[vmlinux_path__nr_entries]);
2175                 vmlinux_path[vmlinux_path__nr_entries] = NULL;
2176         }
2177
2178         free(vmlinux_path);
2179         vmlinux_path = NULL;
2180 }
2181
2182 static int vmlinux_path__init(void)
2183 {
2184         struct utsname uts;
2185         char bf[PATH_MAX];
2186
2187         if (uname(&uts) < 0)
2188                 return -1;
2189
2190         vmlinux_path = malloc(sizeof(char *) * 5);
2191         if (vmlinux_path == NULL)
2192                 return -1;
2193
2194         vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
2195         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2196                 goto out_fail;
2197         ++vmlinux_path__nr_entries;
2198         vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
2199         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2200                 goto out_fail;
2201         ++vmlinux_path__nr_entries;
2202         snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
2203         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2204         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2205                 goto out_fail;
2206         ++vmlinux_path__nr_entries;
2207         snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release);
2208         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2209         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2210                 goto out_fail;
2211         ++vmlinux_path__nr_entries;
2212         snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
2213                  uts.release);
2214         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2215         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2216                 goto out_fail;
2217         ++vmlinux_path__nr_entries;
2218
2219         return 0;
2220
2221 out_fail:
2222         vmlinux_path__exit();
2223         return -1;
2224 }
2225
2226 size_t machine__fprintf_vmlinux_path(struct machine *self, FILE *fp)
2227 {
2228         int i;
2229         size_t printed = 0;
2230         struct dso *kdso = self->vmlinux_maps[MAP__FUNCTION]->dso;
2231
2232         if (kdso->has_build_id) {
2233                 char filename[PATH_MAX];
2234                 if (dso__build_id_filename(kdso, filename, sizeof(filename)))
2235                         printed += fprintf(fp, "[0] %s\n", filename);
2236         }
2237
2238         for (i = 0; i < vmlinux_path__nr_entries; ++i)
2239                 printed += fprintf(fp, "[%d] %s\n",
2240                                    i + kdso->has_build_id, vmlinux_path[i]);
2241
2242         return printed;
2243 }
2244
2245 static int setup_list(struct strlist **list, const char *list_str,
2246                       const char *list_name)
2247 {
2248         if (list_str == NULL)
2249                 return 0;
2250
2251         *list = strlist__new(true, list_str);
2252         if (!*list) {
2253                 pr_err("problems parsing %s list\n", list_name);
2254                 return -1;
2255         }
2256         return 0;
2257 }
2258
2259 int symbol__init(void)
2260 {
2261         elf_version(EV_CURRENT);
2262         if (symbol_conf.sort_by_name)
2263                 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
2264                                           sizeof(struct symbol));
2265
2266         if (symbol_conf.try_vmlinux_path && vmlinux_path__init() < 0)
2267                 return -1;
2268
2269         if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
2270                 pr_err("'.' is the only non valid --field-separator argument\n");
2271                 return -1;
2272         }
2273
2274         if (setup_list(&symbol_conf.dso_list,
2275                        symbol_conf.dso_list_str, "dso") < 0)
2276                 return -1;
2277
2278         if (setup_list(&symbol_conf.comm_list,
2279                        symbol_conf.comm_list_str, "comm") < 0)
2280                 goto out_free_dso_list;
2281
2282         if (setup_list(&symbol_conf.sym_list,
2283                        symbol_conf.sym_list_str, "symbol") < 0)
2284                 goto out_free_comm_list;
2285
2286         return 0;
2287
2288 out_free_dso_list:
2289         strlist__delete(symbol_conf.dso_list);
2290 out_free_comm_list:
2291         strlist__delete(symbol_conf.comm_list);
2292         return -1;
2293 }
2294
2295 void symbol__exit(void)
2296 {
2297         strlist__delete(symbol_conf.sym_list);
2298         strlist__delete(symbol_conf.dso_list);
2299         strlist__delete(symbol_conf.comm_list);
2300         vmlinux_path__exit();
2301         symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2302 }
2303
2304 int machines__create_kernel_maps(struct rb_root *self, pid_t pid)
2305 {
2306         struct machine *machine = machines__findnew(self, pid);
2307
2308         if (machine == NULL)
2309                 return -1;
2310
2311         return machine__create_kernel_maps(machine);
2312 }
2313
2314 static int hex(char ch)
2315 {
2316         if ((ch >= '0') && (ch <= '9'))
2317                 return ch - '0';
2318         if ((ch >= 'a') && (ch <= 'f'))
2319                 return ch - 'a' + 10;
2320         if ((ch >= 'A') && (ch <= 'F'))
2321                 return ch - 'A' + 10;
2322         return -1;
2323 }
2324
2325 /*
2326  * While we find nice hex chars, build a long_val.
2327  * Return number of chars processed.
2328  */
2329 int hex2u64(const char *ptr, u64 *long_val)
2330 {
2331         const char *p = ptr;
2332         *long_val = 0;
2333
2334         while (*p) {
2335                 const int hex_val = hex(*p);
2336
2337                 if (hex_val < 0)
2338                         break;
2339
2340                 *long_val = (*long_val << 4) | hex_val;
2341                 p++;
2342         }
2343
2344         return p - ptr;
2345 }
2346
2347 char *strxfrchar(char *s, char from, char to)
2348 {
2349         char *p = s;
2350
2351         while ((p = strchr(p, from)) != NULL)
2352                 *p++ = to;
2353
2354         return s;
2355 }
2356
2357 int machines__create_guest_kernel_maps(struct rb_root *self)
2358 {
2359         int ret = 0;
2360         struct dirent **namelist = NULL;
2361         int i, items = 0;
2362         char path[PATH_MAX];
2363         pid_t pid;
2364
2365         if (symbol_conf.default_guest_vmlinux_name ||
2366             symbol_conf.default_guest_modules ||
2367             symbol_conf.default_guest_kallsyms) {
2368                 machines__create_kernel_maps(self, DEFAULT_GUEST_KERNEL_ID);
2369         }
2370
2371         if (symbol_conf.guestmount) {
2372                 items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL);
2373                 if (items <= 0)
2374                         return -ENOENT;
2375                 for (i = 0; i < items; i++) {
2376                         if (!isdigit(namelist[i]->d_name[0])) {
2377                                 /* Filter out . and .. */
2378                                 continue;
2379                         }
2380                         pid = atoi(namelist[i]->d_name);
2381                         sprintf(path, "%s/%s/proc/kallsyms",
2382                                 symbol_conf.guestmount,
2383                                 namelist[i]->d_name);
2384                         ret = access(path, R_OK);
2385                         if (ret) {
2386                                 pr_debug("Can't access file %s\n", path);
2387                                 goto failure;
2388                         }
2389                         machines__create_kernel_maps(self, pid);
2390                 }
2391 failure:
2392                 free(namelist);
2393         }
2394
2395         return ret;
2396 }
2397
2398 void machines__destroy_guest_kernel_maps(struct rb_root *self)
2399 {
2400         struct rb_node *next = rb_first(self);
2401
2402         while (next) {
2403                 struct machine *pos = rb_entry(next, struct machine, rb_node);
2404
2405                 next = rb_next(&pos->rb_node);
2406                 rb_erase(&pos->rb_node, self);
2407                 machine__delete(pos);
2408         }
2409 }
2410
2411 int machine__load_kallsyms(struct machine *self, const char *filename,
2412                            enum map_type type, symbol_filter_t filter)
2413 {
2414         struct map *map = self->vmlinux_maps[type];
2415         int ret = dso__load_kallsyms(map->dso, filename, map, filter);
2416
2417         if (ret > 0) {
2418                 dso__set_loaded(map->dso, type);
2419                 /*
2420                  * Since /proc/kallsyms will have multiple sessions for the
2421                  * kernel, with modules between them, fixup the end of all
2422                  * sections.
2423                  */
2424                 __map_groups__fixup_end(&self->kmaps, type);
2425         }
2426
2427         return ret;
2428 }
2429
2430 int machine__load_vmlinux_path(struct machine *self, enum map_type type,
2431                                symbol_filter_t filter)
2432 {
2433         struct map *map = self->vmlinux_maps[type];
2434         int ret = dso__load_vmlinux_path(map->dso, map, filter);
2435
2436         if (ret > 0) {
2437                 dso__set_loaded(map->dso, type);
2438                 map__reloc_vmlinux(map);
2439         }
2440
2441         return ret;
2442 }