Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6.git] / tools / perf / util / symbol.c
1 #include "util.h"
2 #include "../perf.h"
3 #include "string.h"
4 #include "symbol.h"
5
6 #include "debug.h"
7
8 #include <libelf.h>
9 #include <gelf.h>
10 #include <elf.h>
11
12 const char *sym_hist_filter;
13
14 enum dso_origin {
15         DSO__ORIG_KERNEL = 0,
16         DSO__ORIG_JAVA_JIT,
17         DSO__ORIG_FEDORA,
18         DSO__ORIG_UBUNTU,
19         DSO__ORIG_BUILDID,
20         DSO__ORIG_DSO,
21         DSO__ORIG_NOT_FOUND,
22 };
23
24 static struct symbol *symbol__new(u64 start, u64 len,
25                                   const char *name, unsigned int priv_size,
26                                   u64 obj_start, int v)
27 {
28         size_t namelen = strlen(name) + 1;
29         struct symbol *self = calloc(1, priv_size + sizeof(*self) + namelen);
30
31         if (!self)
32                 return NULL;
33
34         if (v >= 2)
35                 printf("new symbol: %016Lx [%08lx]: %s, hist: %p, obj_start: %p\n",
36                         (u64)start, (unsigned long)len, name, self->hist, (void *)(unsigned long)obj_start);
37
38         self->obj_start= obj_start;
39         self->hist = NULL;
40         self->hist_sum = 0;
41
42         if (sym_hist_filter && !strcmp(name, sym_hist_filter))
43                 self->hist = calloc(sizeof(u64), len);
44
45         if (priv_size) {
46                 memset(self, 0, priv_size);
47                 self = ((void *)self) + priv_size;
48         }
49         self->start = start;
50         self->end   = len ? start + len - 1 : start;
51         memcpy(self->name, name, namelen);
52
53         return self;
54 }
55
56 static void symbol__delete(struct symbol *self, unsigned int priv_size)
57 {
58         free(((void *)self) - priv_size);
59 }
60
61 static size_t symbol__fprintf(struct symbol *self, FILE *fp)
62 {
63         if (!self->module)
64                 return fprintf(fp, " %llx-%llx %s\n",
65                        self->start, self->end, self->name);
66         else
67                 return fprintf(fp, " %llx-%llx %s \t[%s]\n",
68                        self->start, self->end, self->name, self->module->name);
69 }
70
71 struct dso *dso__new(const char *name, unsigned int sym_priv_size)
72 {
73         struct dso *self = malloc(sizeof(*self) + strlen(name) + 1);
74
75         if (self != NULL) {
76                 strcpy(self->name, name);
77                 self->syms = RB_ROOT;
78                 self->sym_priv_size = sym_priv_size;
79                 self->find_symbol = dso__find_symbol;
80                 self->slen_calculated = 0;
81                 self->origin = DSO__ORIG_NOT_FOUND;
82         }
83
84         return self;
85 }
86
87 static void dso__delete_symbols(struct dso *self)
88 {
89         struct symbol *pos;
90         struct rb_node *next = rb_first(&self->syms);
91
92         while (next) {
93                 pos = rb_entry(next, struct symbol, rb_node);
94                 next = rb_next(&pos->rb_node);
95                 rb_erase(&pos->rb_node, &self->syms);
96                 symbol__delete(pos, self->sym_priv_size);
97         }
98 }
99
100 void dso__delete(struct dso *self)
101 {
102         dso__delete_symbols(self);
103         free(self);
104 }
105
106 static void dso__insert_symbol(struct dso *self, struct symbol *sym)
107 {
108         struct rb_node **p = &self->syms.rb_node;
109         struct rb_node *parent = NULL;
110         const u64 ip = sym->start;
111         struct symbol *s;
112
113         while (*p != NULL) {
114                 parent = *p;
115                 s = rb_entry(parent, struct symbol, rb_node);
116                 if (ip < s->start)
117                         p = &(*p)->rb_left;
118                 else
119                         p = &(*p)->rb_right;
120         }
121         rb_link_node(&sym->rb_node, parent, p);
122         rb_insert_color(&sym->rb_node, &self->syms);
123 }
124
125 struct symbol *dso__find_symbol(struct dso *self, u64 ip)
126 {
127         struct rb_node *n;
128
129         if (self == NULL)
130                 return NULL;
131
132         n = self->syms.rb_node;
133
134         while (n) {
135                 struct symbol *s = rb_entry(n, struct symbol, rb_node);
136
137                 if (ip < s->start)
138                         n = n->rb_left;
139                 else if (ip > s->end)
140                         n = n->rb_right;
141                 else
142                         return s;
143         }
144
145         return NULL;
146 }
147
148 size_t dso__fprintf(struct dso *self, FILE *fp)
149 {
150         size_t ret = fprintf(fp, "dso: %s\n", self->name);
151
152         struct rb_node *nd;
153         for (nd = rb_first(&self->syms); nd; nd = rb_next(nd)) {
154                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
155                 ret += symbol__fprintf(pos, fp);
156         }
157
158         return ret;
159 }
160
161 static int dso__load_kallsyms(struct dso *self, symbol_filter_t filter, int v)
162 {
163         struct rb_node *nd, *prevnd;
164         char *line = NULL;
165         size_t n;
166         FILE *file = fopen("/proc/kallsyms", "r");
167         int count = 0;
168
169         if (file == NULL)
170                 goto out_failure;
171
172         while (!feof(file)) {
173                 u64 start;
174                 struct symbol *sym;
175                 int line_len, len;
176                 char symbol_type;
177
178                 line_len = getline(&line, &n, file);
179                 if (line_len < 0)
180                         break;
181
182                 if (!line)
183                         goto out_failure;
184
185                 line[--line_len] = '\0'; /* \n */
186
187                 len = hex2u64(line, &start);
188
189                 len++;
190                 if (len + 2 >= line_len)
191                         continue;
192
193                 symbol_type = toupper(line[len]);
194                 /*
195                  * We're interested only in code ('T'ext)
196                  */
197                 if (symbol_type != 'T' && symbol_type != 'W')
198                         continue;
199                 /*
200                  * Well fix up the end later, when we have all sorted.
201                  */
202                 sym = symbol__new(start, 0xdead, line + len + 2,
203                                   self->sym_priv_size, 0, v);
204
205                 if (sym == NULL)
206                         goto out_delete_line;
207
208                 if (filter && filter(self, sym))
209                         symbol__delete(sym, self->sym_priv_size);
210                 else {
211                         dso__insert_symbol(self, sym);
212                         count++;
213                 }
214         }
215
216         /*
217          * Now that we have all sorted out, just set the ->end of all
218          * symbols
219          */
220         prevnd = rb_first(&self->syms);
221
222         if (prevnd == NULL)
223                 goto out_delete_line;
224
225         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
226                 struct symbol *prev = rb_entry(prevnd, struct symbol, rb_node),
227                               *curr = rb_entry(nd, struct symbol, rb_node);
228
229                 prev->end = curr->start - 1;
230                 prevnd = nd;
231         }
232
233         free(line);
234         fclose(file);
235
236         return count;
237
238 out_delete_line:
239         free(line);
240 out_failure:
241         return -1;
242 }
243
244 static int dso__load_perf_map(struct dso *self, symbol_filter_t filter, int v)
245 {
246         char *line = NULL;
247         size_t n;
248         FILE *file;
249         int nr_syms = 0;
250
251         file = fopen(self->name, "r");
252         if (file == NULL)
253                 goto out_failure;
254
255         while (!feof(file)) {
256                 u64 start, size;
257                 struct symbol *sym;
258                 int line_len, len;
259
260                 line_len = getline(&line, &n, file);
261                 if (line_len < 0)
262                         break;
263
264                 if (!line)
265                         goto out_failure;
266
267                 line[--line_len] = '\0'; /* \n */
268
269                 len = hex2u64(line, &start);
270
271                 len++;
272                 if (len + 2 >= line_len)
273                         continue;
274
275                 len += hex2u64(line + len, &size);
276
277                 len++;
278                 if (len + 2 >= line_len)
279                         continue;
280
281                 sym = symbol__new(start, size, line + len,
282                                   self->sym_priv_size, start, v);
283
284                 if (sym == NULL)
285                         goto out_delete_line;
286
287                 if (filter && filter(self, sym))
288                         symbol__delete(sym, self->sym_priv_size);
289                 else {
290                         dso__insert_symbol(self, sym);
291                         nr_syms++;
292                 }
293         }
294
295         free(line);
296         fclose(file);
297
298         return nr_syms;
299
300 out_delete_line:
301         free(line);
302 out_failure:
303         return -1;
304 }
305
306 /**
307  * elf_symtab__for_each_symbol - iterate thru all the symbols
308  *
309  * @self: struct elf_symtab instance to iterate
310  * @idx: uint32_t idx
311  * @sym: GElf_Sym iterator
312  */
313 #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
314         for (idx = 0, gelf_getsym(syms, idx, &sym);\
315              idx < nr_syms; \
316              idx++, gelf_getsym(syms, idx, &sym))
317
318 static inline uint8_t elf_sym__type(const GElf_Sym *sym)
319 {
320         return GELF_ST_TYPE(sym->st_info);
321 }
322
323 static inline int elf_sym__is_function(const GElf_Sym *sym)
324 {
325         return elf_sym__type(sym) == STT_FUNC &&
326                sym->st_name != 0 &&
327                sym->st_shndx != SHN_UNDEF &&
328                sym->st_size != 0;
329 }
330
331 static inline int elf_sym__is_label(const GElf_Sym *sym)
332 {
333         return elf_sym__type(sym) == STT_NOTYPE &&
334                 sym->st_name != 0 &&
335                 sym->st_shndx != SHN_UNDEF &&
336                 sym->st_shndx != SHN_ABS;
337 }
338
339 static inline const char *elf_sec__name(const GElf_Shdr *shdr,
340                                         const Elf_Data *secstrs)
341 {
342         return secstrs->d_buf + shdr->sh_name;
343 }
344
345 static inline int elf_sec__is_text(const GElf_Shdr *shdr,
346                                         const Elf_Data *secstrs)
347 {
348         return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
349 }
350
351 static inline const char *elf_sym__name(const GElf_Sym *sym,
352                                         const Elf_Data *symstrs)
353 {
354         return symstrs->d_buf + sym->st_name;
355 }
356
357 static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
358                                     GElf_Shdr *shp, const char *name,
359                                     size_t *idx)
360 {
361         Elf_Scn *sec = NULL;
362         size_t cnt = 1;
363
364         while ((sec = elf_nextscn(elf, sec)) != NULL) {
365                 char *str;
366
367                 gelf_getshdr(sec, shp);
368                 str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
369                 if (!strcmp(name, str)) {
370                         if (idx)
371                                 *idx = cnt;
372                         break;
373                 }
374                 ++cnt;
375         }
376
377         return sec;
378 }
379
380 #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
381         for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \
382              idx < nr_entries; \
383              ++idx, pos = gelf_getrel(reldata, idx, &pos_mem))
384
385 #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \
386         for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \
387              idx < nr_entries; \
388              ++idx, pos = gelf_getrela(reldata, idx, &pos_mem))
389
390 /*
391  * We need to check if we have a .dynsym, so that we can handle the
392  * .plt, synthesizing its symbols, that aren't on the symtabs (be it
393  * .dynsym or .symtab).
394  * And always look at the original dso, not at debuginfo packages, that
395  * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
396  */
397 static int dso__synthesize_plt_symbols(struct  dso *self, int v)
398 {
399         uint32_t nr_rel_entries, idx;
400         GElf_Sym sym;
401         u64 plt_offset;
402         GElf_Shdr shdr_plt;
403         struct symbol *f;
404         GElf_Shdr shdr_rel_plt, shdr_dynsym;
405         Elf_Data *reldata, *syms, *symstrs;
406         Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym;
407         size_t dynsym_idx;
408         GElf_Ehdr ehdr;
409         char sympltname[1024];
410         Elf *elf;
411         int nr = 0, symidx, fd, err = 0;
412
413         fd = open(self->name, O_RDONLY);
414         if (fd < 0)
415                 goto out;
416
417         elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
418         if (elf == NULL)
419                 goto out_close;
420
421         if (gelf_getehdr(elf, &ehdr) == NULL)
422                 goto out_elf_end;
423
424         scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym,
425                                          ".dynsym", &dynsym_idx);
426         if (scn_dynsym == NULL)
427                 goto out_elf_end;
428
429         scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
430                                           ".rela.plt", NULL);
431         if (scn_plt_rel == NULL) {
432                 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
433                                                   ".rel.plt", NULL);
434                 if (scn_plt_rel == NULL)
435                         goto out_elf_end;
436         }
437
438         err = -1;
439
440         if (shdr_rel_plt.sh_link != dynsym_idx)
441                 goto out_elf_end;
442
443         if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL)
444                 goto out_elf_end;
445
446         /*
447          * Fetch the relocation section to find the idxes to the GOT
448          * and the symbols in the .dynsym they refer to.
449          */
450         reldata = elf_getdata(scn_plt_rel, NULL);
451         if (reldata == NULL)
452                 goto out_elf_end;
453
454         syms = elf_getdata(scn_dynsym, NULL);
455         if (syms == NULL)
456                 goto out_elf_end;
457
458         scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link);
459         if (scn_symstrs == NULL)
460                 goto out_elf_end;
461
462         symstrs = elf_getdata(scn_symstrs, NULL);
463         if (symstrs == NULL)
464                 goto out_elf_end;
465
466         nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize;
467         plt_offset = shdr_plt.sh_offset;
468
469         if (shdr_rel_plt.sh_type == SHT_RELA) {
470                 GElf_Rela pos_mem, *pos;
471
472                 elf_section__for_each_rela(reldata, pos, pos_mem, idx,
473                                            nr_rel_entries) {
474                         symidx = GELF_R_SYM(pos->r_info);
475                         plt_offset += shdr_plt.sh_entsize;
476                         gelf_getsym(syms, symidx, &sym);
477                         snprintf(sympltname, sizeof(sympltname),
478                                  "%s@plt", elf_sym__name(&sym, symstrs));
479
480                         f = symbol__new(plt_offset, shdr_plt.sh_entsize,
481                                         sympltname, self->sym_priv_size, 0, v);
482                         if (!f)
483                                 goto out_elf_end;
484
485                         dso__insert_symbol(self, f);
486                         ++nr;
487                 }
488         } else if (shdr_rel_plt.sh_type == SHT_REL) {
489                 GElf_Rel pos_mem, *pos;
490                 elf_section__for_each_rel(reldata, pos, pos_mem, idx,
491                                           nr_rel_entries) {
492                         symidx = GELF_R_SYM(pos->r_info);
493                         plt_offset += shdr_plt.sh_entsize;
494                         gelf_getsym(syms, symidx, &sym);
495                         snprintf(sympltname, sizeof(sympltname),
496                                  "%s@plt", elf_sym__name(&sym, symstrs));
497
498                         f = symbol__new(plt_offset, shdr_plt.sh_entsize,
499                                         sympltname, self->sym_priv_size, 0, v);
500                         if (!f)
501                                 goto out_elf_end;
502
503                         dso__insert_symbol(self, f);
504                         ++nr;
505                 }
506         }
507
508         err = 0;
509 out_elf_end:
510         elf_end(elf);
511 out_close:
512         close(fd);
513
514         if (err == 0)
515                 return nr;
516 out:
517         fprintf(stderr, "%s: problems reading %s PLT info.\n",
518                 __func__, self->name);
519         return 0;
520 }
521
522 static int dso__load_sym(struct dso *self, int fd, const char *name,
523                          symbol_filter_t filter, int v, struct module *mod)
524 {
525         Elf_Data *symstrs, *secstrs;
526         uint32_t nr_syms;
527         int err = -1;
528         uint32_t idx;
529         GElf_Ehdr ehdr;
530         GElf_Shdr shdr;
531         Elf_Data *syms;
532         GElf_Sym sym;
533         Elf_Scn *sec, *sec_strndx;
534         Elf *elf;
535         int nr = 0, kernel = !strcmp("[kernel]", self->name);
536
537         elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
538         if (elf == NULL) {
539                 if (v)
540                         fprintf(stderr, "%s: cannot read %s ELF file.\n",
541                                 __func__, name);
542                 goto out_close;
543         }
544
545         if (gelf_getehdr(elf, &ehdr) == NULL) {
546                 if (v)
547                         fprintf(stderr, "%s: cannot get elf header.\n", __func__);
548                 goto out_elf_end;
549         }
550
551         sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL);
552         if (sec == NULL) {
553                 sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL);
554                 if (sec == NULL)
555                         goto out_elf_end;
556         }
557
558         syms = elf_getdata(sec, NULL);
559         if (syms == NULL)
560                 goto out_elf_end;
561
562         sec = elf_getscn(elf, shdr.sh_link);
563         if (sec == NULL)
564                 goto out_elf_end;
565
566         symstrs = elf_getdata(sec, NULL);
567         if (symstrs == NULL)
568                 goto out_elf_end;
569
570         sec_strndx = elf_getscn(elf, ehdr.e_shstrndx);
571         if (sec_strndx == NULL)
572                 goto out_elf_end;
573
574         secstrs = elf_getdata(sec_strndx, NULL);
575         if (secstrs == NULL)
576                 goto out_elf_end;
577
578         nr_syms = shdr.sh_size / shdr.sh_entsize;
579
580         memset(&sym, 0, sizeof(sym));
581         if (!kernel) {
582                 self->adjust_symbols = (ehdr.e_type == ET_EXEC ||
583                                 elf_section_by_name(elf, &ehdr, &shdr,
584                                                      ".gnu.prelink_undo",
585                                                      NULL) != NULL);
586         } else self->adjust_symbols = 0;
587
588         elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
589                 struct symbol *f;
590                 const char *elf_name;
591                 char *demangled;
592                 u64 obj_start;
593                 struct section *section = NULL;
594                 int is_label = elf_sym__is_label(&sym);
595                 const char *section_name;
596
597                 if (!is_label && !elf_sym__is_function(&sym))
598                         continue;
599
600                 sec = elf_getscn(elf, sym.st_shndx);
601                 if (!sec)
602                         goto out_elf_end;
603
604                 gelf_getshdr(sec, &shdr);
605
606                 if (is_label && !elf_sec__is_text(&shdr, secstrs))
607                         continue;
608
609                 section_name = elf_sec__name(&shdr, secstrs);
610                 obj_start = sym.st_value;
611
612                 if (self->adjust_symbols) {
613                         if (v >= 2)
614                                 printf("adjusting symbol: st_value: %Lx sh_addr: %Lx sh_offset: %Lx\n",
615                                         (u64)sym.st_value, (u64)shdr.sh_addr, (u64)shdr.sh_offset);
616
617                         sym.st_value -= shdr.sh_addr - shdr.sh_offset;
618                 }
619
620                 if (mod) {
621                         section = mod->sections->find_section(mod->sections, section_name);
622                         if (section)
623                                 sym.st_value += section->vma;
624                         else {
625                                 fprintf(stderr, "dso__load_sym() module %s lookup of %s failed\n",
626                                         mod->name, section_name);
627                                 goto out_elf_end;
628                         }
629                 }
630                 /*
631                  * We need to figure out if the object was created from C++ sources
632                  * DWARF DW_compile_unit has this, but we don't always have access
633                  * to it...
634                  */
635                 elf_name = elf_sym__name(&sym, symstrs);
636                 demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI);
637                 if (demangled != NULL)
638                         elf_name = demangled;
639
640                 f = symbol__new(sym.st_value, sym.st_size, elf_name,
641                                 self->sym_priv_size, obj_start, v);
642                 free(demangled);
643                 if (!f)
644                         goto out_elf_end;
645
646                 if (filter && filter(self, f))
647                         symbol__delete(f, self->sym_priv_size);
648                 else {
649                         f->module = mod;
650                         dso__insert_symbol(self, f);
651                         nr++;
652                 }
653         }
654
655         err = nr;
656 out_elf_end:
657         elf_end(elf);
658 out_close:
659         return err;
660 }
661
662 #define BUILD_ID_SIZE 128
663
664 static char *dso__read_build_id(struct dso *self, int v)
665 {
666         int i;
667         GElf_Ehdr ehdr;
668         GElf_Shdr shdr;
669         Elf_Data *build_id_data;
670         Elf_Scn *sec;
671         char *build_id = NULL, *bid;
672         unsigned char *raw;
673         Elf *elf;
674         int fd = open(self->name, O_RDONLY);
675
676         if (fd < 0)
677                 goto out;
678
679         elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
680         if (elf == NULL) {
681                 if (v)
682                         fprintf(stderr, "%s: cannot read %s ELF file.\n",
683                                 __func__, self->name);
684                 goto out_close;
685         }
686
687         if (gelf_getehdr(elf, &ehdr) == NULL) {
688                 if (v)
689                         fprintf(stderr, "%s: cannot get elf header.\n", __func__);
690                 goto out_elf_end;
691         }
692
693         sec = elf_section_by_name(elf, &ehdr, &shdr, ".note.gnu.build-id", NULL);
694         if (sec == NULL)
695                 goto out_elf_end;
696
697         build_id_data = elf_getdata(sec, NULL);
698         if (build_id_data == NULL)
699                 goto out_elf_end;
700         build_id = malloc(BUILD_ID_SIZE);
701         if (build_id == NULL)
702                 goto out_elf_end;
703         raw = build_id_data->d_buf + 16;
704         bid = build_id;
705
706         for (i = 0; i < 20; ++i) {
707                 sprintf(bid, "%02x", *raw);
708                 ++raw;
709                 bid += 2;
710         }
711         if (v >= 2)
712                 printf("%s(%s): %s\n", __func__, self->name, build_id);
713 out_elf_end:
714         elf_end(elf);
715 out_close:
716         close(fd);
717 out:
718         return build_id;
719 }
720
721 char dso__symtab_origin(const struct dso *self)
722 {
723         static const char origin[] = {
724                 [DSO__ORIG_KERNEL] =   'k',
725                 [DSO__ORIG_JAVA_JIT] = 'j',
726                 [DSO__ORIG_FEDORA] =   'f',
727                 [DSO__ORIG_UBUNTU] =   'u',
728                 [DSO__ORIG_BUILDID] =  'b',
729                 [DSO__ORIG_DSO] =      'd',
730         };
731
732         if (self == NULL || self->origin == DSO__ORIG_NOT_FOUND)
733                 return '!';
734         return origin[self->origin];
735 }
736
737 int dso__load(struct dso *self, symbol_filter_t filter, int v)
738 {
739         int size = PATH_MAX;
740         char *name = malloc(size), *build_id = NULL;
741         int ret = -1;
742         int fd;
743
744         if (!name)
745                 return -1;
746
747         self->adjust_symbols = 0;
748
749         if (strncmp(self->name, "/tmp/perf-", 10) == 0) {
750                 ret = dso__load_perf_map(self, filter, v);
751                 self->origin = ret > 0 ? DSO__ORIG_JAVA_JIT :
752                                          DSO__ORIG_NOT_FOUND;
753                 return ret;
754         }
755
756         self->origin = DSO__ORIG_FEDORA - 1;
757
758 more:
759         do {
760                 self->origin++;
761                 switch (self->origin) {
762                 case DSO__ORIG_FEDORA:
763                         snprintf(name, size, "/usr/lib/debug%s.debug", self->name);
764                         break;
765                 case DSO__ORIG_UBUNTU:
766                         snprintf(name, size, "/usr/lib/debug%s", self->name);
767                         break;
768                 case DSO__ORIG_BUILDID:
769                         build_id = dso__read_build_id(self, v);
770                         if (build_id != NULL) {
771                                 snprintf(name, size,
772                                          "/usr/lib/debug/.build-id/%.2s/%s.debug",
773                                         build_id, build_id + 2);
774                                 free(build_id);
775                                 break;
776                         }
777                         self->origin++;
778                         /* Fall thru */
779                 case DSO__ORIG_DSO:
780                         snprintf(name, size, "%s", self->name);
781                         break;
782
783                 default:
784                         goto out;
785                 }
786
787                 fd = open(name, O_RDONLY);
788         } while (fd < 0);
789
790         ret = dso__load_sym(self, fd, name, filter, v, NULL);
791         close(fd);
792
793         /*
794          * Some people seem to have debuginfo files _WITHOUT_ debug info!?!?
795          */
796         if (!ret)
797                 goto more;
798
799         if (ret > 0) {
800                 int nr_plt = dso__synthesize_plt_symbols(self, v);
801                 if (nr_plt > 0)
802                         ret += nr_plt;
803         }
804 out:
805         free(name);
806         if (ret < 0 && strstr(self->name, " (deleted)") != NULL)
807                 return 0;
808         return ret;
809 }
810
811 static int dso__load_module(struct dso *self, struct mod_dso *mods, const char *name,
812                              symbol_filter_t filter, int v)
813 {
814         struct module *mod = mod_dso__find_module(mods, name);
815         int err = 0, fd;
816
817         if (mod == NULL || !mod->active)
818                 return err;
819
820         fd = open(mod->path, O_RDONLY);
821
822         if (fd < 0)
823                 return err;
824
825         err = dso__load_sym(self, fd, name, filter, v, mod);
826         close(fd);
827
828         return err;
829 }
830
831 int dso__load_modules(struct dso *self, symbol_filter_t filter, int v)
832 {
833         struct mod_dso *mods = mod_dso__new_dso("modules");
834         struct module *pos;
835         struct rb_node *next;
836         int err, count = 0;
837
838         err = mod_dso__load_modules(mods);
839
840         if (err <= 0)
841                 return err;
842
843         /*
844          * Iterate over modules, and load active symbols.
845          */
846         next = rb_first(&mods->mods);
847         while (next) {
848                 pos = rb_entry(next, struct module, rb_node);
849                 err = dso__load_module(self, mods, pos->name, filter, v);
850
851                 if (err < 0)
852                         break;
853
854                 next = rb_next(&pos->rb_node);
855                 count += err;
856         }
857
858         if (err < 0) {
859                 mod_dso__delete_modules(mods);
860                 mod_dso__delete_self(mods);
861                 return err;
862         }
863
864         return count;
865 }
866
867 static inline void dso__fill_symbol_holes(struct dso *self)
868 {
869         struct symbol *prev = NULL;
870         struct rb_node *nd;
871
872         for (nd = rb_last(&self->syms); nd; nd = rb_prev(nd)) {
873                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
874
875                 if (prev) {
876                         u64 hole = 0;
877                         int alias = pos->start == prev->start;
878
879                         if (!alias)
880                                 hole = prev->start - pos->end - 1;
881
882                         if (hole || alias) {
883                                 if (alias)
884                                         pos->end = prev->end;
885                                 else if (hole)
886                                         pos->end = prev->start - 1;
887                         }
888                 }
889                 prev = pos;
890         }
891 }
892
893 static int dso__load_vmlinux(struct dso *self, const char *vmlinux,
894                              symbol_filter_t filter, int v)
895 {
896         int err, fd = open(vmlinux, O_RDONLY);
897
898         if (fd < 0)
899                 return -1;
900
901         err = dso__load_sym(self, fd, vmlinux, filter, v, NULL);
902
903         if (err > 0)
904                 dso__fill_symbol_holes(self);
905
906         close(fd);
907
908         return err;
909 }
910
911 int dso__load_kernel(struct dso *self, const char *vmlinux,
912                      symbol_filter_t filter, int v, int use_modules)
913 {
914         int err = -1;
915
916         if (vmlinux) {
917                 err = dso__load_vmlinux(self, vmlinux, filter, v);
918                 if (err > 0 && use_modules) {
919                         int syms = dso__load_modules(self, filter, v);
920
921                         if (syms < 0) {
922                                 fprintf(stderr, "dso__load_modules failed!\n");
923                                 return syms;
924                         }
925                         err += syms;
926                 }
927         }
928
929         if (err <= 0)
930                 err = dso__load_kallsyms(self, filter, v);
931
932         if (err > 0)
933                 self->origin = DSO__ORIG_KERNEL;
934
935         return err;
936 }
937
938 LIST_HEAD(dsos);
939 struct dso      *kernel_dso;
940 struct dso      *vdso;
941 struct dso      *hypervisor_dso;
942
943 const char      *vmlinux_name = "vmlinux";
944 int             modules;
945
946 static void dsos__add(struct dso *dso)
947 {
948         list_add_tail(&dso->node, &dsos);
949 }
950
951 static struct dso *dsos__find(const char *name)
952 {
953         struct dso *pos;
954
955         list_for_each_entry(pos, &dsos, node)
956                 if (strcmp(pos->name, name) == 0)
957                         return pos;
958         return NULL;
959 }
960
961 struct dso *dsos__findnew(const char *name)
962 {
963         struct dso *dso = dsos__find(name);
964         int nr;
965
966         if (dso)
967                 return dso;
968
969         dso = dso__new(name, 0);
970         if (!dso)
971                 goto out_delete_dso;
972
973         nr = dso__load(dso, NULL, verbose);
974         if (nr < 0) {
975                 eprintf("Failed to open: %s\n", name);
976                 goto out_delete_dso;
977         }
978         if (!nr)
979                 eprintf("No symbols found in: %s, maybe install a debug package?\n", name);
980
981         dsos__add(dso);
982
983         return dso;
984
985 out_delete_dso:
986         dso__delete(dso);
987         return NULL;
988 }
989
990 void dsos__fprintf(FILE *fp)
991 {
992         struct dso *pos;
993
994         list_for_each_entry(pos, &dsos, node)
995                 dso__fprintf(pos, fp);
996 }
997
998 static struct symbol *vdso__find_symbol(struct dso *dso, u64 ip)
999 {
1000         return dso__find_symbol(dso, ip);
1001 }
1002
1003 int load_kernel(void)
1004 {
1005         int err;
1006
1007         kernel_dso = dso__new("[kernel]", 0);
1008         if (!kernel_dso)
1009                 return -1;
1010
1011         err = dso__load_kernel(kernel_dso, vmlinux_name, NULL, verbose, modules);
1012         if (err <= 0) {
1013                 dso__delete(kernel_dso);
1014                 kernel_dso = NULL;
1015         } else
1016                 dsos__add(kernel_dso);
1017
1018         vdso = dso__new("[vdso]", 0);
1019         if (!vdso)
1020                 return -1;
1021
1022         vdso->find_symbol = vdso__find_symbol;
1023
1024         dsos__add(vdso);
1025
1026         hypervisor_dso = dso__new("[hypervisor]", 0);
1027         if (!hypervisor_dso)
1028                 return -1;
1029         dsos__add(hypervisor_dso);
1030
1031         return err;
1032 }
1033
1034
1035 void symbol__init(void)
1036 {
1037         elf_version(EV_CURRENT);
1038 }