Commit | Line | Data |
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e5a1845f NK |
1 | #include <fcntl.h> |
2 | #include <stdio.h> | |
3 | #include <errno.h> | |
4 | #include <string.h> | |
5 | #include <unistd.h> | |
6 | #include <inttypes.h> | |
7 | ||
8 | #include "symbol.h" | |
e9c4bcdd | 9 | #include "demangle-java.h" |
cae15db7 | 10 | #include "demangle-rust.h" |
8fa7d87f | 11 | #include "machine.h" |
922d0e4d | 12 | #include "vdso.h" |
c506c96b | 13 | #include <symbol/kallsyms.h> |
e5a1845f NK |
14 | #include "debug.h" |
15 | ||
e370a3d5 DA |
16 | #ifndef EM_AARCH64 |
17 | #define EM_AARCH64 183 /* ARM 64 bit */ | |
18 | #endif | |
19 | ||
cc31078c | 20 | typedef Elf64_Nhdr GElf_Nhdr; |
e370a3d5 | 21 | |
aaba4e12 ACM |
22 | #ifdef HAVE_CPLUS_DEMANGLE_SUPPORT |
23 | extern char *cplus_demangle(const char *, int); | |
24 | ||
25 | static inline char *bfd_demangle(void __maybe_unused *v, const char *c, int i) | |
26 | { | |
27 | return cplus_demangle(c, i); | |
28 | } | |
29 | #else | |
30 | #ifdef NO_DEMANGLE | |
31 | static inline char *bfd_demangle(void __maybe_unused *v, | |
32 | const char __maybe_unused *c, | |
33 | int __maybe_unused i) | |
34 | { | |
35 | return NULL; | |
36 | } | |
37 | #else | |
38 | #define PACKAGE 'perf' | |
39 | #include <bfd.h> | |
40 | #endif | |
41 | #endif | |
42 | ||
89fe808a | 43 | #ifndef HAVE_ELF_GETPHDRNUM_SUPPORT |
179f36dd | 44 | static int elf_getphdrnum(Elf *elf, size_t *dst) |
e955d5c4 AH |
45 | { |
46 | GElf_Ehdr gehdr; | |
47 | GElf_Ehdr *ehdr; | |
48 | ||
49 | ehdr = gelf_getehdr(elf, &gehdr); | |
50 | if (!ehdr) | |
51 | return -1; | |
52 | ||
53 | *dst = ehdr->e_phnum; | |
54 | ||
55 | return 0; | |
56 | } | |
57 | #endif | |
58 | ||
2492c465 ACM |
59 | #ifndef HAVE_ELF_GETSHDRSTRNDX_SUPPORT |
60 | static int elf_getshdrstrndx(Elf *elf __maybe_unused, size_t *dst __maybe_unused) | |
61 | { | |
62 | pr_err("%s: update your libelf to > 0.140, this one lacks elf_getshdrstrndx().\n", __func__); | |
63 | return -1; | |
64 | } | |
65 | #endif | |
66 | ||
e5a1845f NK |
67 | #ifndef NT_GNU_BUILD_ID |
68 | #define NT_GNU_BUILD_ID 3 | |
69 | #endif | |
70 | ||
71 | /** | |
72 | * elf_symtab__for_each_symbol - iterate thru all the symbols | |
73 | * | |
74 | * @syms: struct elf_symtab instance to iterate | |
75 | * @idx: uint32_t idx | |
76 | * @sym: GElf_Sym iterator | |
77 | */ | |
78 | #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \ | |
79 | for (idx = 0, gelf_getsym(syms, idx, &sym);\ | |
80 | idx < nr_syms; \ | |
81 | idx++, gelf_getsym(syms, idx, &sym)) | |
82 | ||
83 | static inline uint8_t elf_sym__type(const GElf_Sym *sym) | |
84 | { | |
85 | return GELF_ST_TYPE(sym->st_info); | |
86 | } | |
87 | ||
4e31050f VL |
88 | #ifndef STT_GNU_IFUNC |
89 | #define STT_GNU_IFUNC 10 | |
90 | #endif | |
91 | ||
e5a1845f NK |
92 | static inline int elf_sym__is_function(const GElf_Sym *sym) |
93 | { | |
a2f3b6bf AH |
94 | return (elf_sym__type(sym) == STT_FUNC || |
95 | elf_sym__type(sym) == STT_GNU_IFUNC) && | |
e5a1845f NK |
96 | sym->st_name != 0 && |
97 | sym->st_shndx != SHN_UNDEF; | |
98 | } | |
99 | ||
100 | static inline bool elf_sym__is_object(const GElf_Sym *sym) | |
101 | { | |
102 | return elf_sym__type(sym) == STT_OBJECT && | |
103 | sym->st_name != 0 && | |
104 | sym->st_shndx != SHN_UNDEF; | |
105 | } | |
106 | ||
107 | static inline int elf_sym__is_label(const GElf_Sym *sym) | |
108 | { | |
109 | return elf_sym__type(sym) == STT_NOTYPE && | |
110 | sym->st_name != 0 && | |
111 | sym->st_shndx != SHN_UNDEF && | |
112 | sym->st_shndx != SHN_ABS; | |
113 | } | |
114 | ||
115 | static bool elf_sym__is_a(GElf_Sym *sym, enum map_type type) | |
116 | { | |
117 | switch (type) { | |
118 | case MAP__FUNCTION: | |
119 | return elf_sym__is_function(sym); | |
120 | case MAP__VARIABLE: | |
121 | return elf_sym__is_object(sym); | |
122 | default: | |
123 | return false; | |
124 | } | |
125 | } | |
126 | ||
127 | static inline const char *elf_sym__name(const GElf_Sym *sym, | |
128 | const Elf_Data *symstrs) | |
129 | { | |
130 | return symstrs->d_buf + sym->st_name; | |
131 | } | |
132 | ||
133 | static inline const char *elf_sec__name(const GElf_Shdr *shdr, | |
134 | const Elf_Data *secstrs) | |
135 | { | |
136 | return secstrs->d_buf + shdr->sh_name; | |
137 | } | |
138 | ||
139 | static inline int elf_sec__is_text(const GElf_Shdr *shdr, | |
140 | const Elf_Data *secstrs) | |
141 | { | |
142 | return strstr(elf_sec__name(shdr, secstrs), "text") != NULL; | |
143 | } | |
144 | ||
145 | static inline bool elf_sec__is_data(const GElf_Shdr *shdr, | |
146 | const Elf_Data *secstrs) | |
147 | { | |
148 | return strstr(elf_sec__name(shdr, secstrs), "data") != NULL; | |
149 | } | |
150 | ||
151 | static bool elf_sec__is_a(GElf_Shdr *shdr, Elf_Data *secstrs, | |
152 | enum map_type type) | |
153 | { | |
154 | switch (type) { | |
155 | case MAP__FUNCTION: | |
156 | return elf_sec__is_text(shdr, secstrs); | |
157 | case MAP__VARIABLE: | |
158 | return elf_sec__is_data(shdr, secstrs); | |
159 | default: | |
160 | return false; | |
161 | } | |
162 | } | |
163 | ||
164 | static size_t elf_addr_to_index(Elf *elf, GElf_Addr addr) | |
165 | { | |
166 | Elf_Scn *sec = NULL; | |
167 | GElf_Shdr shdr; | |
168 | size_t cnt = 1; | |
169 | ||
170 | while ((sec = elf_nextscn(elf, sec)) != NULL) { | |
171 | gelf_getshdr(sec, &shdr); | |
172 | ||
173 | if ((addr >= shdr.sh_addr) && | |
174 | (addr < (shdr.sh_addr + shdr.sh_size))) | |
175 | return cnt; | |
176 | ||
177 | ++cnt; | |
178 | } | |
179 | ||
180 | return -1; | |
181 | } | |
182 | ||
99ca4233 MH |
183 | Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep, |
184 | GElf_Shdr *shp, const char *name, size_t *idx) | |
e5a1845f NK |
185 | { |
186 | Elf_Scn *sec = NULL; | |
187 | size_t cnt = 1; | |
188 | ||
49274654 CS |
189 | /* Elf is corrupted/truncated, avoid calling elf_strptr. */ |
190 | if (!elf_rawdata(elf_getscn(elf, ep->e_shstrndx), NULL)) | |
191 | return NULL; | |
192 | ||
e5a1845f NK |
193 | while ((sec = elf_nextscn(elf, sec)) != NULL) { |
194 | char *str; | |
195 | ||
196 | gelf_getshdr(sec, shp); | |
197 | str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name); | |
155b3a13 | 198 | if (str && !strcmp(name, str)) { |
e5a1845f NK |
199 | if (idx) |
200 | *idx = cnt; | |
155b3a13 | 201 | return sec; |
e5a1845f NK |
202 | } |
203 | ++cnt; | |
204 | } | |
205 | ||
155b3a13 | 206 | return NULL; |
e5a1845f NK |
207 | } |
208 | ||
209 | #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \ | |
210 | for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \ | |
211 | idx < nr_entries; \ | |
212 | ++idx, pos = gelf_getrel(reldata, idx, &pos_mem)) | |
213 | ||
214 | #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \ | |
215 | for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \ | |
216 | idx < nr_entries; \ | |
217 | ++idx, pos = gelf_getrela(reldata, idx, &pos_mem)) | |
218 | ||
219 | /* | |
220 | * We need to check if we have a .dynsym, so that we can handle the | |
221 | * .plt, synthesizing its symbols, that aren't on the symtabs (be it | |
222 | * .dynsym or .symtab). | |
223 | * And always look at the original dso, not at debuginfo packages, that | |
224 | * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS). | |
225 | */ | |
a44f605b | 226 | int dso__synthesize_plt_symbols(struct dso *dso, struct symsrc *ss, struct map *map, |
e5a1845f NK |
227 | symbol_filter_t filter) |
228 | { | |
229 | uint32_t nr_rel_entries, idx; | |
230 | GElf_Sym sym; | |
231 | u64 plt_offset; | |
232 | GElf_Shdr shdr_plt; | |
233 | struct symbol *f; | |
234 | GElf_Shdr shdr_rel_plt, shdr_dynsym; | |
235 | Elf_Data *reldata, *syms, *symstrs; | |
236 | Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym; | |
237 | size_t dynsym_idx; | |
238 | GElf_Ehdr ehdr; | |
239 | char sympltname[1024]; | |
240 | Elf *elf; | |
a44f605b | 241 | int nr = 0, symidx, err = 0; |
e5a1845f | 242 | |
f47b58b7 DA |
243 | if (!ss->dynsym) |
244 | return 0; | |
245 | ||
a44f605b CS |
246 | elf = ss->elf; |
247 | ehdr = ss->ehdr; | |
e5a1845f | 248 | |
a44f605b CS |
249 | scn_dynsym = ss->dynsym; |
250 | shdr_dynsym = ss->dynshdr; | |
251 | dynsym_idx = ss->dynsym_idx; | |
e5a1845f | 252 | |
e5a1845f NK |
253 | if (scn_dynsym == NULL) |
254 | goto out_elf_end; | |
255 | ||
256 | scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt, | |
257 | ".rela.plt", NULL); | |
258 | if (scn_plt_rel == NULL) { | |
259 | scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt, | |
260 | ".rel.plt", NULL); | |
261 | if (scn_plt_rel == NULL) | |
262 | goto out_elf_end; | |
263 | } | |
264 | ||
265 | err = -1; | |
266 | ||
267 | if (shdr_rel_plt.sh_link != dynsym_idx) | |
268 | goto out_elf_end; | |
269 | ||
270 | if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL) | |
271 | goto out_elf_end; | |
272 | ||
273 | /* | |
274 | * Fetch the relocation section to find the idxes to the GOT | |
275 | * and the symbols in the .dynsym they refer to. | |
276 | */ | |
277 | reldata = elf_getdata(scn_plt_rel, NULL); | |
278 | if (reldata == NULL) | |
279 | goto out_elf_end; | |
280 | ||
281 | syms = elf_getdata(scn_dynsym, NULL); | |
282 | if (syms == NULL) | |
283 | goto out_elf_end; | |
284 | ||
285 | scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link); | |
286 | if (scn_symstrs == NULL) | |
287 | goto out_elf_end; | |
288 | ||
289 | symstrs = elf_getdata(scn_symstrs, NULL); | |
290 | if (symstrs == NULL) | |
291 | goto out_elf_end; | |
292 | ||
52f9ddba CS |
293 | if (symstrs->d_size == 0) |
294 | goto out_elf_end; | |
295 | ||
e5a1845f NK |
296 | nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize; |
297 | plt_offset = shdr_plt.sh_offset; | |
298 | ||
299 | if (shdr_rel_plt.sh_type == SHT_RELA) { | |
300 | GElf_Rela pos_mem, *pos; | |
301 | ||
302 | elf_section__for_each_rela(reldata, pos, pos_mem, idx, | |
303 | nr_rel_entries) { | |
304 | symidx = GELF_R_SYM(pos->r_info); | |
305 | plt_offset += shdr_plt.sh_entsize; | |
306 | gelf_getsym(syms, symidx, &sym); | |
307 | snprintf(sympltname, sizeof(sympltname), | |
308 | "%s@plt", elf_sym__name(&sym, symstrs)); | |
309 | ||
310 | f = symbol__new(plt_offset, shdr_plt.sh_entsize, | |
311 | STB_GLOBAL, sympltname); | |
312 | if (!f) | |
313 | goto out_elf_end; | |
314 | ||
315 | if (filter && filter(map, f)) | |
316 | symbol__delete(f); | |
317 | else { | |
318 | symbols__insert(&dso->symbols[map->type], f); | |
319 | ++nr; | |
320 | } | |
321 | } | |
322 | } else if (shdr_rel_plt.sh_type == SHT_REL) { | |
323 | GElf_Rel pos_mem, *pos; | |
324 | elf_section__for_each_rel(reldata, pos, pos_mem, idx, | |
325 | nr_rel_entries) { | |
326 | symidx = GELF_R_SYM(pos->r_info); | |
327 | plt_offset += shdr_plt.sh_entsize; | |
328 | gelf_getsym(syms, symidx, &sym); | |
329 | snprintf(sympltname, sizeof(sympltname), | |
330 | "%s@plt", elf_sym__name(&sym, symstrs)); | |
331 | ||
332 | f = symbol__new(plt_offset, shdr_plt.sh_entsize, | |
333 | STB_GLOBAL, sympltname); | |
334 | if (!f) | |
335 | goto out_elf_end; | |
336 | ||
337 | if (filter && filter(map, f)) | |
338 | symbol__delete(f); | |
339 | else { | |
340 | symbols__insert(&dso->symbols[map->type], f); | |
341 | ++nr; | |
342 | } | |
343 | } | |
344 | } | |
345 | ||
346 | err = 0; | |
347 | out_elf_end: | |
e5a1845f NK |
348 | if (err == 0) |
349 | return nr; | |
e5a1845f NK |
350 | pr_debug("%s: problems reading %s PLT info.\n", |
351 | __func__, dso->long_name); | |
352 | return 0; | |
353 | } | |
354 | ||
355 | /* | |
356 | * Align offset to 4 bytes as needed for note name and descriptor data. | |
357 | */ | |
358 | #define NOTE_ALIGN(n) (((n) + 3) & -4U) | |
359 | ||
360 | static int elf_read_build_id(Elf *elf, void *bf, size_t size) | |
361 | { | |
362 | int err = -1; | |
363 | GElf_Ehdr ehdr; | |
364 | GElf_Shdr shdr; | |
365 | Elf_Data *data; | |
366 | Elf_Scn *sec; | |
367 | Elf_Kind ek; | |
368 | void *ptr; | |
369 | ||
370 | if (size < BUILD_ID_SIZE) | |
371 | goto out; | |
372 | ||
373 | ek = elf_kind(elf); | |
374 | if (ek != ELF_K_ELF) | |
375 | goto out; | |
376 | ||
377 | if (gelf_getehdr(elf, &ehdr) == NULL) { | |
378 | pr_err("%s: cannot get elf header.\n", __func__); | |
379 | goto out; | |
380 | } | |
381 | ||
382 | /* | |
383 | * Check following sections for notes: | |
384 | * '.note.gnu.build-id' | |
385 | * '.notes' | |
386 | * '.note' (VDSO specific) | |
387 | */ | |
388 | do { | |
389 | sec = elf_section_by_name(elf, &ehdr, &shdr, | |
390 | ".note.gnu.build-id", NULL); | |
391 | if (sec) | |
392 | break; | |
393 | ||
394 | sec = elf_section_by_name(elf, &ehdr, &shdr, | |
395 | ".notes", NULL); | |
396 | if (sec) | |
397 | break; | |
398 | ||
399 | sec = elf_section_by_name(elf, &ehdr, &shdr, | |
400 | ".note", NULL); | |
401 | if (sec) | |
402 | break; | |
403 | ||
404 | return err; | |
405 | ||
406 | } while (0); | |
407 | ||
408 | data = elf_getdata(sec, NULL); | |
409 | if (data == NULL) | |
410 | goto out; | |
411 | ||
412 | ptr = data->d_buf; | |
413 | while (ptr < (data->d_buf + data->d_size)) { | |
414 | GElf_Nhdr *nhdr = ptr; | |
415 | size_t namesz = NOTE_ALIGN(nhdr->n_namesz), | |
416 | descsz = NOTE_ALIGN(nhdr->n_descsz); | |
417 | const char *name; | |
418 | ||
419 | ptr += sizeof(*nhdr); | |
420 | name = ptr; | |
421 | ptr += namesz; | |
422 | if (nhdr->n_type == NT_GNU_BUILD_ID && | |
423 | nhdr->n_namesz == sizeof("GNU")) { | |
424 | if (memcmp(name, "GNU", sizeof("GNU")) == 0) { | |
425 | size_t sz = min(size, descsz); | |
426 | memcpy(bf, ptr, sz); | |
427 | memset(bf + sz, 0, size - sz); | |
428 | err = descsz; | |
429 | break; | |
430 | } | |
431 | } | |
432 | ptr += descsz; | |
433 | } | |
434 | ||
435 | out: | |
436 | return err; | |
437 | } | |
438 | ||
439 | int filename__read_build_id(const char *filename, void *bf, size_t size) | |
440 | { | |
441 | int fd, err = -1; | |
442 | Elf *elf; | |
443 | ||
444 | if (size < BUILD_ID_SIZE) | |
445 | goto out; | |
446 | ||
447 | fd = open(filename, O_RDONLY); | |
448 | if (fd < 0) | |
449 | goto out; | |
450 | ||
451 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
452 | if (elf == NULL) { | |
453 | pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename); | |
454 | goto out_close; | |
455 | } | |
456 | ||
457 | err = elf_read_build_id(elf, bf, size); | |
458 | ||
459 | elf_end(elf); | |
460 | out_close: | |
461 | close(fd); | |
462 | out: | |
463 | return err; | |
464 | } | |
465 | ||
466 | int sysfs__read_build_id(const char *filename, void *build_id, size_t size) | |
467 | { | |
468 | int fd, err = -1; | |
469 | ||
470 | if (size < BUILD_ID_SIZE) | |
471 | goto out; | |
472 | ||
473 | fd = open(filename, O_RDONLY); | |
474 | if (fd < 0) | |
475 | goto out; | |
476 | ||
477 | while (1) { | |
478 | char bf[BUFSIZ]; | |
479 | GElf_Nhdr nhdr; | |
480 | size_t namesz, descsz; | |
481 | ||
482 | if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr)) | |
483 | break; | |
484 | ||
485 | namesz = NOTE_ALIGN(nhdr.n_namesz); | |
486 | descsz = NOTE_ALIGN(nhdr.n_descsz); | |
487 | if (nhdr.n_type == NT_GNU_BUILD_ID && | |
488 | nhdr.n_namesz == sizeof("GNU")) { | |
489 | if (read(fd, bf, namesz) != (ssize_t)namesz) | |
490 | break; | |
491 | if (memcmp(bf, "GNU", sizeof("GNU")) == 0) { | |
492 | size_t sz = min(descsz, size); | |
493 | if (read(fd, build_id, sz) == (ssize_t)sz) { | |
494 | memset(build_id + sz, 0, size - sz); | |
495 | err = 0; | |
496 | break; | |
497 | } | |
498 | } else if (read(fd, bf, descsz) != (ssize_t)descsz) | |
499 | break; | |
500 | } else { | |
501 | int n = namesz + descsz; | |
502 | if (read(fd, bf, n) != n) | |
503 | break; | |
504 | } | |
505 | } | |
506 | close(fd); | |
507 | out: | |
508 | return err; | |
509 | } | |
510 | ||
511 | int filename__read_debuglink(const char *filename, char *debuglink, | |
512 | size_t size) | |
513 | { | |
514 | int fd, err = -1; | |
515 | Elf *elf; | |
516 | GElf_Ehdr ehdr; | |
517 | GElf_Shdr shdr; | |
518 | Elf_Data *data; | |
519 | Elf_Scn *sec; | |
520 | Elf_Kind ek; | |
521 | ||
522 | fd = open(filename, O_RDONLY); | |
523 | if (fd < 0) | |
524 | goto out; | |
525 | ||
526 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
527 | if (elf == NULL) { | |
528 | pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename); | |
529 | goto out_close; | |
530 | } | |
531 | ||
532 | ek = elf_kind(elf); | |
533 | if (ek != ELF_K_ELF) | |
784f3390 | 534 | goto out_elf_end; |
e5a1845f NK |
535 | |
536 | if (gelf_getehdr(elf, &ehdr) == NULL) { | |
537 | pr_err("%s: cannot get elf header.\n", __func__); | |
784f3390 | 538 | goto out_elf_end; |
e5a1845f NK |
539 | } |
540 | ||
541 | sec = elf_section_by_name(elf, &ehdr, &shdr, | |
542 | ".gnu_debuglink", NULL); | |
543 | if (sec == NULL) | |
784f3390 | 544 | goto out_elf_end; |
e5a1845f NK |
545 | |
546 | data = elf_getdata(sec, NULL); | |
547 | if (data == NULL) | |
784f3390 | 548 | goto out_elf_end; |
e5a1845f NK |
549 | |
550 | /* the start of this section is a zero-terminated string */ | |
551 | strncpy(debuglink, data->d_buf, size); | |
552 | ||
0d3dc5e8 SE |
553 | err = 0; |
554 | ||
784f3390 | 555 | out_elf_end: |
e5a1845f | 556 | elf_end(elf); |
e5a1845f NK |
557 | out_close: |
558 | close(fd); | |
559 | out: | |
560 | return err; | |
561 | } | |
562 | ||
563 | static int dso__swap_init(struct dso *dso, unsigned char eidata) | |
564 | { | |
565 | static unsigned int const endian = 1; | |
566 | ||
567 | dso->needs_swap = DSO_SWAP__NO; | |
568 | ||
569 | switch (eidata) { | |
570 | case ELFDATA2LSB: | |
571 | /* We are big endian, DSO is little endian. */ | |
572 | if (*(unsigned char const *)&endian != 1) | |
573 | dso->needs_swap = DSO_SWAP__YES; | |
574 | break; | |
575 | ||
576 | case ELFDATA2MSB: | |
577 | /* We are little endian, DSO is big endian. */ | |
578 | if (*(unsigned char const *)&endian != 0) | |
579 | dso->needs_swap = DSO_SWAP__YES; | |
580 | break; | |
581 | ||
582 | default: | |
583 | pr_err("unrecognized DSO data encoding %d\n", eidata); | |
584 | return -EINVAL; | |
585 | } | |
586 | ||
587 | return 0; | |
588 | } | |
589 | ||
c00c48fc NK |
590 | static int decompress_kmodule(struct dso *dso, const char *name, |
591 | enum dso_binary_type type) | |
592 | { | |
914f85c4 | 593 | int fd = -1; |
c00c48fc | 594 | char tmpbuf[] = "/tmp/perf-kmod-XXXXXX"; |
914f85c4 | 595 | struct kmod_path m; |
c00c48fc | 596 | |
0b064f43 NK |
597 | if (type != DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP && |
598 | type != DSO_BINARY_TYPE__GUEST_KMODULE_COMP && | |
599 | type != DSO_BINARY_TYPE__BUILD_ID_CACHE) | |
c00c48fc NK |
600 | return -1; |
601 | ||
914f85c4 JO |
602 | if (type == DSO_BINARY_TYPE__BUILD_ID_CACHE) |
603 | name = dso->long_name; | |
604 | ||
605 | if (kmod_path__parse_ext(&m, name) || !m.comp) | |
606 | return -1; | |
c00c48fc NK |
607 | |
608 | fd = mkstemp(tmpbuf); | |
18425f13 ACM |
609 | if (fd < 0) { |
610 | dso->load_errno = errno; | |
914f85c4 | 611 | goto out; |
18425f13 | 612 | } |
c00c48fc | 613 | |
914f85c4 | 614 | if (!decompress_to_file(m.ext, name, fd)) { |
18425f13 | 615 | dso->load_errno = DSO_LOAD_ERRNO__DECOMPRESSION_FAILURE; |
c00c48fc NK |
616 | close(fd); |
617 | fd = -1; | |
618 | } | |
619 | ||
620 | unlink(tmpbuf); | |
621 | ||
914f85c4 JO |
622 | out: |
623 | free(m.ext); | |
c00c48fc NK |
624 | return fd; |
625 | } | |
626 | ||
3aafe5ae CS |
627 | bool symsrc__possibly_runtime(struct symsrc *ss) |
628 | { | |
629 | return ss->dynsym || ss->opdsec; | |
630 | } | |
631 | ||
d26cd12b CS |
632 | bool symsrc__has_symtab(struct symsrc *ss) |
633 | { | |
634 | return ss->symtab != NULL; | |
635 | } | |
b68e2f91 CS |
636 | |
637 | void symsrc__destroy(struct symsrc *ss) | |
638 | { | |
74cf249d | 639 | zfree(&ss->name); |
b68e2f91 CS |
640 | elf_end(ss->elf); |
641 | close(ss->fd); | |
642 | } | |
643 | ||
d2332098 NR |
644 | bool __weak elf__needs_adjust_symbols(GElf_Ehdr ehdr) |
645 | { | |
646 | return ehdr.e_type == ET_EXEC || ehdr.e_type == ET_REL; | |
647 | } | |
648 | ||
b68e2f91 CS |
649 | int symsrc__init(struct symsrc *ss, struct dso *dso, const char *name, |
650 | enum dso_binary_type type) | |
e5a1845f | 651 | { |
e5a1845f | 652 | int err = -1; |
e5a1845f | 653 | GElf_Ehdr ehdr; |
e5a1845f | 654 | Elf *elf; |
b68e2f91 CS |
655 | int fd; |
656 | ||
18425f13 | 657 | if (dso__needs_decompress(dso)) { |
c00c48fc | 658 | fd = decompress_kmodule(dso, name, type); |
18425f13 ACM |
659 | if (fd < 0) |
660 | return -1; | |
661 | } else { | |
c00c48fc | 662 | fd = open(name, O_RDONLY); |
18425f13 ACM |
663 | if (fd < 0) { |
664 | dso->load_errno = errno; | |
665 | return -1; | |
666 | } | |
667 | } | |
e5a1845f NK |
668 | |
669 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
670 | if (elf == NULL) { | |
671 | pr_debug("%s: cannot read %s ELF file.\n", __func__, name); | |
18425f13 | 672 | dso->load_errno = DSO_LOAD_ERRNO__INVALID_ELF; |
e5a1845f NK |
673 | goto out_close; |
674 | } | |
675 | ||
676 | if (gelf_getehdr(elf, &ehdr) == NULL) { | |
18425f13 | 677 | dso->load_errno = DSO_LOAD_ERRNO__INVALID_ELF; |
e5a1845f NK |
678 | pr_debug("%s: cannot get elf header.\n", __func__); |
679 | goto out_elf_end; | |
680 | } | |
681 | ||
18425f13 ACM |
682 | if (dso__swap_init(dso, ehdr.e_ident[EI_DATA])) { |
683 | dso->load_errno = DSO_LOAD_ERRNO__INTERNAL_ERROR; | |
e5a1845f | 684 | goto out_elf_end; |
18425f13 | 685 | } |
e5a1845f NK |
686 | |
687 | /* Always reject images with a mismatched build-id: */ | |
688 | if (dso->has_build_id) { | |
689 | u8 build_id[BUILD_ID_SIZE]; | |
690 | ||
18425f13 ACM |
691 | if (elf_read_build_id(elf, build_id, BUILD_ID_SIZE) < 0) { |
692 | dso->load_errno = DSO_LOAD_ERRNO__CANNOT_READ_BUILDID; | |
e5a1845f | 693 | goto out_elf_end; |
18425f13 | 694 | } |
e5a1845f | 695 | |
18425f13 | 696 | if (!dso__build_id_equal(dso, build_id)) { |
468f3d29 | 697 | pr_debug("%s: build id mismatch for %s.\n", __func__, name); |
18425f13 | 698 | dso->load_errno = DSO_LOAD_ERRNO__MISMATCHING_BUILDID; |
e5a1845f | 699 | goto out_elf_end; |
18425f13 | 700 | } |
e5a1845f NK |
701 | } |
702 | ||
c6d8f2a4 AH |
703 | ss->is_64_bit = (gelf_getclass(elf) == ELFCLASS64); |
704 | ||
b68e2f91 CS |
705 | ss->symtab = elf_section_by_name(elf, &ehdr, &ss->symshdr, ".symtab", |
706 | NULL); | |
707 | if (ss->symshdr.sh_type != SHT_SYMTAB) | |
708 | ss->symtab = NULL; | |
709 | ||
710 | ss->dynsym_idx = 0; | |
711 | ss->dynsym = elf_section_by_name(elf, &ehdr, &ss->dynshdr, ".dynsym", | |
712 | &ss->dynsym_idx); | |
713 | if (ss->dynshdr.sh_type != SHT_DYNSYM) | |
714 | ss->dynsym = NULL; | |
715 | ||
716 | ss->opdidx = 0; | |
717 | ss->opdsec = elf_section_by_name(elf, &ehdr, &ss->opdshdr, ".opd", | |
718 | &ss->opdidx); | |
719 | if (ss->opdshdr.sh_type != SHT_PROGBITS) | |
720 | ss->opdsec = NULL; | |
721 | ||
99e87f7b WN |
722 | if (dso->kernel == DSO_TYPE_USER) |
723 | ss->adjust_symbols = true; | |
724 | else | |
d2332098 | 725 | ss->adjust_symbols = elf__needs_adjust_symbols(ehdr); |
b68e2f91 CS |
726 | |
727 | ss->name = strdup(name); | |
18425f13 ACM |
728 | if (!ss->name) { |
729 | dso->load_errno = errno; | |
b68e2f91 | 730 | goto out_elf_end; |
18425f13 | 731 | } |
b68e2f91 CS |
732 | |
733 | ss->elf = elf; | |
734 | ss->fd = fd; | |
735 | ss->ehdr = ehdr; | |
736 | ss->type = type; | |
737 | ||
738 | return 0; | |
739 | ||
740 | out_elf_end: | |
741 | elf_end(elf); | |
742 | out_close: | |
743 | close(fd); | |
744 | return err; | |
745 | } | |
746 | ||
39b12f78 AH |
747 | /** |
748 | * ref_reloc_sym_not_found - has kernel relocation symbol been found. | |
749 | * @kmap: kernel maps and relocation reference symbol | |
750 | * | |
751 | * This function returns %true if we are dealing with the kernel maps and the | |
752 | * relocation reference symbol has not yet been found. Otherwise %false is | |
753 | * returned. | |
754 | */ | |
755 | static bool ref_reloc_sym_not_found(struct kmap *kmap) | |
756 | { | |
757 | return kmap && kmap->ref_reloc_sym && kmap->ref_reloc_sym->name && | |
758 | !kmap->ref_reloc_sym->unrelocated_addr; | |
759 | } | |
760 | ||
761 | /** | |
762 | * ref_reloc - kernel relocation offset. | |
763 | * @kmap: kernel maps and relocation reference symbol | |
764 | * | |
765 | * This function returns the offset of kernel addresses as determined by using | |
766 | * the relocation reference symbol i.e. if the kernel has not been relocated | |
767 | * then the return value is zero. | |
768 | */ | |
769 | static u64 ref_reloc(struct kmap *kmap) | |
770 | { | |
771 | if (kmap && kmap->ref_reloc_sym && | |
772 | kmap->ref_reloc_sym->unrelocated_addr) | |
773 | return kmap->ref_reloc_sym->addr - | |
774 | kmap->ref_reloc_sym->unrelocated_addr; | |
775 | return 0; | |
776 | } | |
777 | ||
763122ad AK |
778 | static bool want_demangle(bool is_kernel_sym) |
779 | { | |
780 | return is_kernel_sym ? symbol_conf.demangle_kernel : symbol_conf.demangle; | |
781 | } | |
782 | ||
0b3c2264 NR |
783 | void __weak arch__sym_update(struct symbol *s __maybe_unused, |
784 | GElf_Sym *sym __maybe_unused) { } | |
c50fc0a4 | 785 | |
261360b6 CS |
786 | int dso__load_sym(struct dso *dso, struct map *map, |
787 | struct symsrc *syms_ss, struct symsrc *runtime_ss, | |
d26cd12b | 788 | symbol_filter_t filter, int kmodule) |
b68e2f91 CS |
789 | { |
790 | struct kmap *kmap = dso->kernel ? map__kmap(map) : NULL; | |
ba92732e | 791 | struct map_groups *kmaps = kmap ? map__kmaps(map) : NULL; |
b68e2f91 CS |
792 | struct map *curr_map = map; |
793 | struct dso *curr_dso = dso; | |
794 | Elf_Data *symstrs, *secstrs; | |
795 | uint32_t nr_syms; | |
796 | int err = -1; | |
797 | uint32_t idx; | |
798 | GElf_Ehdr ehdr; | |
261360b6 | 799 | GElf_Shdr shdr; |
73cdf0c6 | 800 | GElf_Shdr tshdr; |
b68e2f91 CS |
801 | Elf_Data *syms, *opddata = NULL; |
802 | GElf_Sym sym; | |
261360b6 | 803 | Elf_Scn *sec, *sec_strndx; |
b68e2f91 CS |
804 | Elf *elf; |
805 | int nr = 0; | |
39b12f78 | 806 | bool remap_kernel = false, adjust_kernel_syms = false; |
b68e2f91 | 807 | |
ba92732e WN |
808 | if (kmap && !kmaps) |
809 | return -1; | |
810 | ||
261360b6 | 811 | dso->symtab_type = syms_ss->type; |
c6d8f2a4 | 812 | dso->is_64_bit = syms_ss->is_64_bit; |
0131c4ec AH |
813 | dso->rel = syms_ss->ehdr.e_type == ET_REL; |
814 | ||
815 | /* | |
816 | * Modules may already have symbols from kallsyms, but those symbols | |
817 | * have the wrong values for the dso maps, so remove them. | |
818 | */ | |
819 | if (kmodule && syms_ss->symtab) | |
820 | symbols__delete(&dso->symbols[map->type]); | |
005f9294 | 821 | |
261360b6 | 822 | if (!syms_ss->symtab) { |
d0b0d040 AB |
823 | /* |
824 | * If the vmlinux is stripped, fail so we will fall back | |
825 | * to using kallsyms. The vmlinux runtime symbols aren't | |
826 | * of much use. | |
827 | */ | |
828 | if (dso->kernel) | |
829 | goto out_elf_end; | |
830 | ||
261360b6 CS |
831 | syms_ss->symtab = syms_ss->dynsym; |
832 | syms_ss->symshdr = syms_ss->dynshdr; | |
d26cd12b CS |
833 | } |
834 | ||
261360b6 CS |
835 | elf = syms_ss->elf; |
836 | ehdr = syms_ss->ehdr; | |
837 | sec = syms_ss->symtab; | |
838 | shdr = syms_ss->symshdr; | |
b68e2f91 | 839 | |
50de1a0c AB |
840 | if (elf_section_by_name(runtime_ss->elf, &runtime_ss->ehdr, &tshdr, |
841 | ".text", NULL)) | |
73cdf0c6 WN |
842 | dso->text_offset = tshdr.sh_addr - tshdr.sh_offset; |
843 | ||
261360b6 CS |
844 | if (runtime_ss->opdsec) |
845 | opddata = elf_rawdata(runtime_ss->opdsec, NULL); | |
e5a1845f NK |
846 | |
847 | syms = elf_getdata(sec, NULL); | |
848 | if (syms == NULL) | |
849 | goto out_elf_end; | |
850 | ||
851 | sec = elf_getscn(elf, shdr.sh_link); | |
852 | if (sec == NULL) | |
853 | goto out_elf_end; | |
854 | ||
855 | symstrs = elf_getdata(sec, NULL); | |
856 | if (symstrs == NULL) | |
857 | goto out_elf_end; | |
858 | ||
f247fb81 | 859 | sec_strndx = elf_getscn(runtime_ss->elf, runtime_ss->ehdr.e_shstrndx); |
e5a1845f NK |
860 | if (sec_strndx == NULL) |
861 | goto out_elf_end; | |
862 | ||
863 | secstrs = elf_getdata(sec_strndx, NULL); | |
864 | if (secstrs == NULL) | |
865 | goto out_elf_end; | |
866 | ||
867 | nr_syms = shdr.sh_size / shdr.sh_entsize; | |
868 | ||
869 | memset(&sym, 0, sizeof(sym)); | |
39b12f78 AH |
870 | |
871 | /* | |
872 | * The kernel relocation symbol is needed in advance in order to adjust | |
873 | * kernel maps correctly. | |
874 | */ | |
875 | if (ref_reloc_sym_not_found(kmap)) { | |
876 | elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) { | |
877 | const char *elf_name = elf_sym__name(&sym, symstrs); | |
878 | ||
879 | if (strcmp(elf_name, kmap->ref_reloc_sym->name)) | |
880 | continue; | |
881 | kmap->ref_reloc_sym->unrelocated_addr = sym.st_value; | |
9176753d AH |
882 | map->reloc = kmap->ref_reloc_sym->addr - |
883 | kmap->ref_reloc_sym->unrelocated_addr; | |
39b12f78 AH |
884 | break; |
885 | } | |
886 | } | |
887 | ||
f0ee3b46 AH |
888 | /* |
889 | * Handle any relocation of vdso necessary because older kernels | |
890 | * attempted to prelink vdso to its virtual address. | |
891 | */ | |
73cdf0c6 WN |
892 | if (dso__is_vdso(dso)) |
893 | map->reloc = map->start - dso->text_offset; | |
f0ee3b46 | 894 | |
39b12f78 AH |
895 | dso->adjust_symbols = runtime_ss->adjust_symbols || ref_reloc(kmap); |
896 | /* | |
897 | * Initial kernel and module mappings do not map to the dso. For | |
898 | * function mappings, flag the fixups. | |
899 | */ | |
900 | if (map->type == MAP__FUNCTION && (dso->kernel || kmodule)) { | |
901 | remap_kernel = true; | |
902 | adjust_kernel_syms = dso->adjust_symbols; | |
903 | } | |
e5a1845f NK |
904 | elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) { |
905 | struct symbol *f; | |
906 | const char *elf_name = elf_sym__name(&sym, symstrs); | |
907 | char *demangled = NULL; | |
908 | int is_label = elf_sym__is_label(&sym); | |
909 | const char *section_name; | |
261360b6 | 910 | bool used_opd = false; |
e5a1845f | 911 | |
e5a1845f NK |
912 | if (!is_label && !elf_sym__is_a(&sym, map->type)) |
913 | continue; | |
914 | ||
915 | /* Reject ARM ELF "mapping symbols": these aren't unique and | |
916 | * don't identify functions, so will confuse the profile | |
917 | * output: */ | |
4886f2ca VK |
918 | if (ehdr.e_machine == EM_ARM || ehdr.e_machine == EM_AARCH64) { |
919 | if (elf_name[0] == '$' && strchr("adtx", elf_name[1]) | |
920 | && (elf_name[2] == '\0' || elf_name[2] == '.')) | |
e5a1845f NK |
921 | continue; |
922 | } | |
923 | ||
261360b6 CS |
924 | if (runtime_ss->opdsec && sym.st_shndx == runtime_ss->opdidx) { |
925 | u32 offset = sym.st_value - syms_ss->opdshdr.sh_addr; | |
e5a1845f NK |
926 | u64 *opd = opddata->d_buf + offset; |
927 | sym.st_value = DSO__SWAP(dso, u64, *opd); | |
261360b6 CS |
928 | sym.st_shndx = elf_addr_to_index(runtime_ss->elf, |
929 | sym.st_value); | |
930 | used_opd = true; | |
e5a1845f | 931 | } |
3843b05d NK |
932 | /* |
933 | * When loading symbols in a data mapping, ABS symbols (which | |
934 | * has a value of SHN_ABS in its st_shndx) failed at | |
935 | * elf_getscn(). And it marks the loading as a failure so | |
936 | * already loaded symbols cannot be fixed up. | |
937 | * | |
938 | * I'm not sure what should be done. Just ignore them for now. | |
939 | * - Namhyung Kim | |
940 | */ | |
941 | if (sym.st_shndx == SHN_ABS) | |
942 | continue; | |
e5a1845f | 943 | |
261360b6 | 944 | sec = elf_getscn(runtime_ss->elf, sym.st_shndx); |
e5a1845f NK |
945 | if (!sec) |
946 | goto out_elf_end; | |
947 | ||
948 | gelf_getshdr(sec, &shdr); | |
949 | ||
950 | if (is_label && !elf_sec__is_a(&shdr, secstrs, map->type)) | |
951 | continue; | |
952 | ||
953 | section_name = elf_sec__name(&shdr, secstrs); | |
954 | ||
955 | /* On ARM, symbols for thumb functions have 1 added to | |
956 | * the symbol address as a flag - remove it */ | |
957 | if ((ehdr.e_machine == EM_ARM) && | |
958 | (map->type == MAP__FUNCTION) && | |
959 | (sym.st_value & 1)) | |
960 | --sym.st_value; | |
961 | ||
39b12f78 | 962 | if (dso->kernel || kmodule) { |
e5a1845f NK |
963 | char dso_name[PATH_MAX]; |
964 | ||
39b12f78 AH |
965 | /* Adjust symbol to map to file offset */ |
966 | if (adjust_kernel_syms) | |
967 | sym.st_value -= shdr.sh_addr - shdr.sh_offset; | |
968 | ||
e5a1845f NK |
969 | if (strcmp(section_name, |
970 | (curr_dso->short_name + | |
971 | dso->short_name_len)) == 0) | |
972 | goto new_symbol; | |
973 | ||
974 | if (strcmp(section_name, ".text") == 0) { | |
39b12f78 AH |
975 | /* |
976 | * The initial kernel mapping is based on | |
977 | * kallsyms and identity maps. Overwrite it to | |
978 | * map to the kernel dso. | |
979 | */ | |
980 | if (remap_kernel && dso->kernel) { | |
981 | remap_kernel = false; | |
982 | map->start = shdr.sh_addr + | |
983 | ref_reloc(kmap); | |
984 | map->end = map->start + shdr.sh_size; | |
985 | map->pgoff = shdr.sh_offset; | |
986 | map->map_ip = map__map_ip; | |
987 | map->unmap_ip = map__unmap_ip; | |
988 | /* Ensure maps are correctly ordered */ | |
ba92732e | 989 | if (kmaps) { |
84c2cafa | 990 | map__get(map); |
ba92732e WN |
991 | map_groups__remove(kmaps, map); |
992 | map_groups__insert(kmaps, map); | |
84c2cafa | 993 | map__put(map); |
ba92732e | 994 | } |
39b12f78 AH |
995 | } |
996 | ||
0131c4ec AH |
997 | /* |
998 | * The initial module mapping is based on | |
999 | * /proc/modules mapped to offset zero. | |
1000 | * Overwrite it to map to the module dso. | |
1001 | */ | |
1002 | if (remap_kernel && kmodule) { | |
1003 | remap_kernel = false; | |
1004 | map->pgoff = shdr.sh_offset; | |
1005 | } | |
1006 | ||
e5a1845f NK |
1007 | curr_map = map; |
1008 | curr_dso = dso; | |
1009 | goto new_symbol; | |
1010 | } | |
1011 | ||
0131c4ec AH |
1012 | if (!kmap) |
1013 | goto new_symbol; | |
1014 | ||
e5a1845f NK |
1015 | snprintf(dso_name, sizeof(dso_name), |
1016 | "%s%s", dso->short_name, section_name); | |
1017 | ||
ba92732e | 1018 | curr_map = map_groups__find_by_name(kmaps, map->type, dso_name); |
e5a1845f NK |
1019 | if (curr_map == NULL) { |
1020 | u64 start = sym.st_value; | |
1021 | ||
1022 | if (kmodule) | |
1023 | start += map->start + shdr.sh_offset; | |
1024 | ||
1025 | curr_dso = dso__new(dso_name); | |
1026 | if (curr_dso == NULL) | |
1027 | goto out_elf_end; | |
1028 | curr_dso->kernel = dso->kernel; | |
1029 | curr_dso->long_name = dso->long_name; | |
1030 | curr_dso->long_name_len = dso->long_name_len; | |
1031 | curr_map = map__new2(start, curr_dso, | |
1032 | map->type); | |
e7a7865c | 1033 | dso__put(curr_dso); |
e5a1845f | 1034 | if (curr_map == NULL) { |
e5a1845f NK |
1035 | goto out_elf_end; |
1036 | } | |
39b12f78 AH |
1037 | if (adjust_kernel_syms) { |
1038 | curr_map->start = shdr.sh_addr + | |
1039 | ref_reloc(kmap); | |
1040 | curr_map->end = curr_map->start + | |
1041 | shdr.sh_size; | |
1042 | curr_map->pgoff = shdr.sh_offset; | |
1043 | } else { | |
1044 | curr_map->map_ip = identity__map_ip; | |
1045 | curr_map->unmap_ip = identity__map_ip; | |
1046 | } | |
e5a1845f | 1047 | curr_dso->symtab_type = dso->symtab_type; |
ba92732e | 1048 | map_groups__insert(kmaps, curr_map); |
e7a7865c MH |
1049 | /* |
1050 | * Add it before we drop the referece to curr_map, | |
1051 | * i.e. while we still are sure to have a reference | |
1052 | * to this DSO via curr_map->dso. | |
1053 | */ | |
1054 | dsos__add(&map->groups->machine->dsos, curr_dso); | |
8d5c340d MH |
1055 | /* kmaps already got it */ |
1056 | map__put(curr_map); | |
e5a1845f NK |
1057 | dso__set_loaded(curr_dso, map->type); |
1058 | } else | |
1059 | curr_dso = curr_map->dso; | |
1060 | ||
1061 | goto new_symbol; | |
1062 | } | |
1063 | ||
261360b6 CS |
1064 | if ((used_opd && runtime_ss->adjust_symbols) |
1065 | || (!used_opd && syms_ss->adjust_symbols)) { | |
e5a1845f NK |
1066 | pr_debug4("%s: adjusting symbol: st_value: %#" PRIx64 " " |
1067 | "sh_addr: %#" PRIx64 " sh_offset: %#" PRIx64 "\n", __func__, | |
1068 | (u64)sym.st_value, (u64)shdr.sh_addr, | |
1069 | (u64)shdr.sh_offset); | |
1070 | sym.st_value -= shdr.sh_addr - shdr.sh_offset; | |
1071 | } | |
950b8354 | 1072 | new_symbol: |
e5a1845f NK |
1073 | /* |
1074 | * We need to figure out if the object was created from C++ sources | |
1075 | * DWARF DW_compile_unit has this, but we don't always have access | |
1076 | * to it... | |
1077 | */ | |
763122ad | 1078 | if (want_demangle(dso->kernel || kmodule)) { |
e71e7945 NK |
1079 | int demangle_flags = DMGL_NO_OPTS; |
1080 | if (verbose) | |
1081 | demangle_flags = DMGL_PARAMS | DMGL_ANSI; | |
1082 | ||
1083 | demangled = bfd_demangle(NULL, elf_name, demangle_flags); | |
e9c4bcdd SE |
1084 | if (demangled == NULL) |
1085 | demangled = java_demangle_sym(elf_name, JAVA_DEMANGLE_NORET); | |
cae15db7 DT |
1086 | else if (rust_is_mangled(demangled)) |
1087 | /* | |
1088 | * Input to Rust demangling is the BFD-demangled | |
1089 | * name which it Rust-demangles in place. | |
1090 | */ | |
1091 | rust_demangle_sym(demangled); | |
1092 | ||
328ccdac NK |
1093 | if (demangled != NULL) |
1094 | elf_name = demangled; | |
1095 | } | |
e5a1845f NK |
1096 | f = symbol__new(sym.st_value, sym.st_size, |
1097 | GELF_ST_BIND(sym.st_info), elf_name); | |
1098 | free(demangled); | |
1099 | if (!f) | |
1100 | goto out_elf_end; | |
1101 | ||
0b3c2264 NR |
1102 | arch__sym_update(f, &sym); |
1103 | ||
e5a1845f NK |
1104 | if (filter && filter(curr_map, f)) |
1105 | symbol__delete(f); | |
1106 | else { | |
1107 | symbols__insert(&curr_dso->symbols[curr_map->type], f); | |
1108 | nr++; | |
1109 | } | |
1110 | } | |
1111 | ||
1112 | /* | |
1113 | * For misannotated, zeroed, ASM function sizes. | |
1114 | */ | |
1115 | if (nr > 0) { | |
680d926a NK |
1116 | if (!symbol_conf.allow_aliases) |
1117 | symbols__fixup_duplicate(&dso->symbols[map->type]); | |
e5a1845f NK |
1118 | symbols__fixup_end(&dso->symbols[map->type]); |
1119 | if (kmap) { | |
1120 | /* | |
1121 | * We need to fixup this here too because we create new | |
1122 | * maps here, for things like vsyscall sections. | |
1123 | */ | |
ba92732e | 1124 | __map_groups__fixup_end(kmaps, map->type); |
e5a1845f NK |
1125 | } |
1126 | } | |
1127 | err = nr; | |
1128 | out_elf_end: | |
e5a1845f NK |
1129 | return err; |
1130 | } | |
1131 | ||
8e0cf965 AH |
1132 | static int elf_read_maps(Elf *elf, bool exe, mapfn_t mapfn, void *data) |
1133 | { | |
1134 | GElf_Phdr phdr; | |
1135 | size_t i, phdrnum; | |
1136 | int err; | |
1137 | u64 sz; | |
1138 | ||
1139 | if (elf_getphdrnum(elf, &phdrnum)) | |
1140 | return -1; | |
1141 | ||
1142 | for (i = 0; i < phdrnum; i++) { | |
1143 | if (gelf_getphdr(elf, i, &phdr) == NULL) | |
1144 | return -1; | |
1145 | if (phdr.p_type != PT_LOAD) | |
1146 | continue; | |
1147 | if (exe) { | |
1148 | if (!(phdr.p_flags & PF_X)) | |
1149 | continue; | |
1150 | } else { | |
1151 | if (!(phdr.p_flags & PF_R)) | |
1152 | continue; | |
1153 | } | |
1154 | sz = min(phdr.p_memsz, phdr.p_filesz); | |
1155 | if (!sz) | |
1156 | continue; | |
1157 | err = mapfn(phdr.p_vaddr, sz, phdr.p_offset, data); | |
1158 | if (err) | |
1159 | return err; | |
1160 | } | |
1161 | return 0; | |
1162 | } | |
1163 | ||
1164 | int file__read_maps(int fd, bool exe, mapfn_t mapfn, void *data, | |
1165 | bool *is_64_bit) | |
1166 | { | |
1167 | int err; | |
1168 | Elf *elf; | |
1169 | ||
1170 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
1171 | if (elf == NULL) | |
1172 | return -1; | |
1173 | ||
1174 | if (is_64_bit) | |
1175 | *is_64_bit = (gelf_getclass(elf) == ELFCLASS64); | |
1176 | ||
1177 | err = elf_read_maps(elf, exe, mapfn, data); | |
1178 | ||
1179 | elf_end(elf); | |
1180 | return err; | |
1181 | } | |
1182 | ||
2b5b8bb2 AH |
1183 | enum dso_type dso__type_fd(int fd) |
1184 | { | |
1185 | enum dso_type dso_type = DSO__TYPE_UNKNOWN; | |
1186 | GElf_Ehdr ehdr; | |
1187 | Elf_Kind ek; | |
1188 | Elf *elf; | |
1189 | ||
1190 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
1191 | if (elf == NULL) | |
1192 | goto out; | |
1193 | ||
1194 | ek = elf_kind(elf); | |
1195 | if (ek != ELF_K_ELF) | |
1196 | goto out_end; | |
1197 | ||
1198 | if (gelf_getclass(elf) == ELFCLASS64) { | |
1199 | dso_type = DSO__TYPE_64BIT; | |
1200 | goto out_end; | |
1201 | } | |
1202 | ||
1203 | if (gelf_getehdr(elf, &ehdr) == NULL) | |
1204 | goto out_end; | |
1205 | ||
1206 | if (ehdr.e_machine == EM_X86_64) | |
1207 | dso_type = DSO__TYPE_X32BIT; | |
1208 | else | |
1209 | dso_type = DSO__TYPE_32BIT; | |
1210 | out_end: | |
1211 | elf_end(elf); | |
1212 | out: | |
1213 | return dso_type; | |
1214 | } | |
1215 | ||
afba19d9 AH |
1216 | static int copy_bytes(int from, off_t from_offs, int to, off_t to_offs, u64 len) |
1217 | { | |
1218 | ssize_t r; | |
1219 | size_t n; | |
1220 | int err = -1; | |
1221 | char *buf = malloc(page_size); | |
1222 | ||
1223 | if (buf == NULL) | |
1224 | return -1; | |
1225 | ||
1226 | if (lseek(to, to_offs, SEEK_SET) != to_offs) | |
1227 | goto out; | |
1228 | ||
1229 | if (lseek(from, from_offs, SEEK_SET) != from_offs) | |
1230 | goto out; | |
1231 | ||
1232 | while (len) { | |
1233 | n = page_size; | |
1234 | if (len < n) | |
1235 | n = len; | |
1236 | /* Use read because mmap won't work on proc files */ | |
1237 | r = read(from, buf, n); | |
1238 | if (r < 0) | |
1239 | goto out; | |
1240 | if (!r) | |
1241 | break; | |
1242 | n = r; | |
1243 | r = write(to, buf, n); | |
1244 | if (r < 0) | |
1245 | goto out; | |
1246 | if ((size_t)r != n) | |
1247 | goto out; | |
1248 | len -= n; | |
1249 | } | |
1250 | ||
1251 | err = 0; | |
1252 | out: | |
1253 | free(buf); | |
1254 | return err; | |
1255 | } | |
1256 | ||
1257 | struct kcore { | |
1258 | int fd; | |
1259 | int elfclass; | |
1260 | Elf *elf; | |
1261 | GElf_Ehdr ehdr; | |
1262 | }; | |
1263 | ||
1264 | static int kcore__open(struct kcore *kcore, const char *filename) | |
1265 | { | |
1266 | GElf_Ehdr *ehdr; | |
1267 | ||
1268 | kcore->fd = open(filename, O_RDONLY); | |
1269 | if (kcore->fd == -1) | |
1270 | return -1; | |
1271 | ||
1272 | kcore->elf = elf_begin(kcore->fd, ELF_C_READ, NULL); | |
1273 | if (!kcore->elf) | |
1274 | goto out_close; | |
1275 | ||
1276 | kcore->elfclass = gelf_getclass(kcore->elf); | |
1277 | if (kcore->elfclass == ELFCLASSNONE) | |
1278 | goto out_end; | |
1279 | ||
1280 | ehdr = gelf_getehdr(kcore->elf, &kcore->ehdr); | |
1281 | if (!ehdr) | |
1282 | goto out_end; | |
1283 | ||
1284 | return 0; | |
1285 | ||
1286 | out_end: | |
1287 | elf_end(kcore->elf); | |
1288 | out_close: | |
1289 | close(kcore->fd); | |
1290 | return -1; | |
1291 | } | |
1292 | ||
1293 | static int kcore__init(struct kcore *kcore, char *filename, int elfclass, | |
1294 | bool temp) | |
1295 | { | |
afba19d9 AH |
1296 | kcore->elfclass = elfclass; |
1297 | ||
1298 | if (temp) | |
1299 | kcore->fd = mkstemp(filename); | |
1300 | else | |
1301 | kcore->fd = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0400); | |
1302 | if (kcore->fd == -1) | |
1303 | return -1; | |
1304 | ||
1305 | kcore->elf = elf_begin(kcore->fd, ELF_C_WRITE, NULL); | |
1306 | if (!kcore->elf) | |
1307 | goto out_close; | |
1308 | ||
1309 | if (!gelf_newehdr(kcore->elf, elfclass)) | |
1310 | goto out_end; | |
1311 | ||
b5cabbcb | 1312 | memset(&kcore->ehdr, 0, sizeof(GElf_Ehdr)); |
afba19d9 AH |
1313 | |
1314 | return 0; | |
1315 | ||
1316 | out_end: | |
1317 | elf_end(kcore->elf); | |
1318 | out_close: | |
1319 | close(kcore->fd); | |
1320 | unlink(filename); | |
1321 | return -1; | |
1322 | } | |
1323 | ||
1324 | static void kcore__close(struct kcore *kcore) | |
1325 | { | |
1326 | elf_end(kcore->elf); | |
1327 | close(kcore->fd); | |
1328 | } | |
1329 | ||
1330 | static int kcore__copy_hdr(struct kcore *from, struct kcore *to, size_t count) | |
1331 | { | |
1332 | GElf_Ehdr *ehdr = &to->ehdr; | |
1333 | GElf_Ehdr *kehdr = &from->ehdr; | |
1334 | ||
1335 | memcpy(ehdr->e_ident, kehdr->e_ident, EI_NIDENT); | |
1336 | ehdr->e_type = kehdr->e_type; | |
1337 | ehdr->e_machine = kehdr->e_machine; | |
1338 | ehdr->e_version = kehdr->e_version; | |
1339 | ehdr->e_entry = 0; | |
1340 | ehdr->e_shoff = 0; | |
1341 | ehdr->e_flags = kehdr->e_flags; | |
1342 | ehdr->e_phnum = count; | |
1343 | ehdr->e_shentsize = 0; | |
1344 | ehdr->e_shnum = 0; | |
1345 | ehdr->e_shstrndx = 0; | |
1346 | ||
1347 | if (from->elfclass == ELFCLASS32) { | |
1348 | ehdr->e_phoff = sizeof(Elf32_Ehdr); | |
1349 | ehdr->e_ehsize = sizeof(Elf32_Ehdr); | |
1350 | ehdr->e_phentsize = sizeof(Elf32_Phdr); | |
1351 | } else { | |
1352 | ehdr->e_phoff = sizeof(Elf64_Ehdr); | |
1353 | ehdr->e_ehsize = sizeof(Elf64_Ehdr); | |
1354 | ehdr->e_phentsize = sizeof(Elf64_Phdr); | |
1355 | } | |
1356 | ||
1357 | if (!gelf_update_ehdr(to->elf, ehdr)) | |
1358 | return -1; | |
1359 | ||
1360 | if (!gelf_newphdr(to->elf, count)) | |
1361 | return -1; | |
1362 | ||
1363 | return 0; | |
1364 | } | |
1365 | ||
1366 | static int kcore__add_phdr(struct kcore *kcore, int idx, off_t offset, | |
1367 | u64 addr, u64 len) | |
1368 | { | |
b5cabbcb AH |
1369 | GElf_Phdr phdr = { |
1370 | .p_type = PT_LOAD, | |
1371 | .p_flags = PF_R | PF_W | PF_X, | |
1372 | .p_offset = offset, | |
1373 | .p_vaddr = addr, | |
1374 | .p_paddr = 0, | |
1375 | .p_filesz = len, | |
1376 | .p_memsz = len, | |
1377 | .p_align = page_size, | |
1378 | }; | |
1379 | ||
1380 | if (!gelf_update_phdr(kcore->elf, idx, &phdr)) | |
afba19d9 AH |
1381 | return -1; |
1382 | ||
1383 | return 0; | |
1384 | } | |
1385 | ||
1386 | static off_t kcore__write(struct kcore *kcore) | |
1387 | { | |
1388 | return elf_update(kcore->elf, ELF_C_WRITE); | |
1389 | } | |
1390 | ||
fc1b691d AH |
1391 | struct phdr_data { |
1392 | off_t offset; | |
1393 | u64 addr; | |
1394 | u64 len; | |
1395 | }; | |
1396 | ||
1397 | struct kcore_copy_info { | |
1398 | u64 stext; | |
1399 | u64 etext; | |
1400 | u64 first_symbol; | |
1401 | u64 last_symbol; | |
1402 | u64 first_module; | |
1403 | u64 last_module_symbol; | |
1404 | struct phdr_data kernel_map; | |
1405 | struct phdr_data modules_map; | |
1406 | }; | |
1407 | ||
1408 | static int kcore_copy__process_kallsyms(void *arg, const char *name, char type, | |
1409 | u64 start) | |
1410 | { | |
1411 | struct kcore_copy_info *kci = arg; | |
1412 | ||
1413 | if (!symbol_type__is_a(type, MAP__FUNCTION)) | |
1414 | return 0; | |
1415 | ||
1416 | if (strchr(name, '[')) { | |
1417 | if (start > kci->last_module_symbol) | |
1418 | kci->last_module_symbol = start; | |
1419 | return 0; | |
1420 | } | |
1421 | ||
1422 | if (!kci->first_symbol || start < kci->first_symbol) | |
1423 | kci->first_symbol = start; | |
1424 | ||
1425 | if (!kci->last_symbol || start > kci->last_symbol) | |
1426 | kci->last_symbol = start; | |
1427 | ||
1428 | if (!strcmp(name, "_stext")) { | |
1429 | kci->stext = start; | |
1430 | return 0; | |
1431 | } | |
1432 | ||
1433 | if (!strcmp(name, "_etext")) { | |
1434 | kci->etext = start; | |
1435 | return 0; | |
1436 | } | |
1437 | ||
1438 | return 0; | |
1439 | } | |
1440 | ||
1441 | static int kcore_copy__parse_kallsyms(struct kcore_copy_info *kci, | |
1442 | const char *dir) | |
1443 | { | |
1444 | char kallsyms_filename[PATH_MAX]; | |
1445 | ||
1446 | scnprintf(kallsyms_filename, PATH_MAX, "%s/kallsyms", dir); | |
1447 | ||
1448 | if (symbol__restricted_filename(kallsyms_filename, "/proc/kallsyms")) | |
1449 | return -1; | |
1450 | ||
1451 | if (kallsyms__parse(kallsyms_filename, kci, | |
1452 | kcore_copy__process_kallsyms) < 0) | |
1453 | return -1; | |
1454 | ||
1455 | return 0; | |
1456 | } | |
1457 | ||
1458 | static int kcore_copy__process_modules(void *arg, | |
1459 | const char *name __maybe_unused, | |
1460 | u64 start) | |
1461 | { | |
1462 | struct kcore_copy_info *kci = arg; | |
1463 | ||
1464 | if (!kci->first_module || start < kci->first_module) | |
1465 | kci->first_module = start; | |
1466 | ||
1467 | return 0; | |
1468 | } | |
1469 | ||
1470 | static int kcore_copy__parse_modules(struct kcore_copy_info *kci, | |
1471 | const char *dir) | |
1472 | { | |
1473 | char modules_filename[PATH_MAX]; | |
1474 | ||
1475 | scnprintf(modules_filename, PATH_MAX, "%s/modules", dir); | |
1476 | ||
1477 | if (symbol__restricted_filename(modules_filename, "/proc/modules")) | |
1478 | return -1; | |
1479 | ||
1480 | if (modules__parse(modules_filename, kci, | |
1481 | kcore_copy__process_modules) < 0) | |
1482 | return -1; | |
1483 | ||
1484 | return 0; | |
1485 | } | |
1486 | ||
1487 | static void kcore_copy__map(struct phdr_data *p, u64 start, u64 end, u64 pgoff, | |
1488 | u64 s, u64 e) | |
1489 | { | |
1490 | if (p->addr || s < start || s >= end) | |
1491 | return; | |
1492 | ||
1493 | p->addr = s; | |
1494 | p->offset = (s - start) + pgoff; | |
1495 | p->len = e < end ? e - s : end - s; | |
1496 | } | |
1497 | ||
1498 | static int kcore_copy__read_map(u64 start, u64 len, u64 pgoff, void *data) | |
1499 | { | |
1500 | struct kcore_copy_info *kci = data; | |
1501 | u64 end = start + len; | |
1502 | ||
1503 | kcore_copy__map(&kci->kernel_map, start, end, pgoff, kci->stext, | |
1504 | kci->etext); | |
1505 | ||
1506 | kcore_copy__map(&kci->modules_map, start, end, pgoff, kci->first_module, | |
1507 | kci->last_module_symbol); | |
1508 | ||
1509 | return 0; | |
1510 | } | |
1511 | ||
1512 | static int kcore_copy__read_maps(struct kcore_copy_info *kci, Elf *elf) | |
1513 | { | |
1514 | if (elf_read_maps(elf, true, kcore_copy__read_map, kci) < 0) | |
1515 | return -1; | |
1516 | ||
1517 | return 0; | |
1518 | } | |
1519 | ||
1520 | static int kcore_copy__calc_maps(struct kcore_copy_info *kci, const char *dir, | |
1521 | Elf *elf) | |
1522 | { | |
1523 | if (kcore_copy__parse_kallsyms(kci, dir)) | |
1524 | return -1; | |
1525 | ||
1526 | if (kcore_copy__parse_modules(kci, dir)) | |
1527 | return -1; | |
1528 | ||
1529 | if (kci->stext) | |
1530 | kci->stext = round_down(kci->stext, page_size); | |
1531 | else | |
1532 | kci->stext = round_down(kci->first_symbol, page_size); | |
1533 | ||
1534 | if (kci->etext) { | |
1535 | kci->etext = round_up(kci->etext, page_size); | |
1536 | } else if (kci->last_symbol) { | |
1537 | kci->etext = round_up(kci->last_symbol, page_size); | |
1538 | kci->etext += page_size; | |
1539 | } | |
1540 | ||
1541 | kci->first_module = round_down(kci->first_module, page_size); | |
1542 | ||
1543 | if (kci->last_module_symbol) { | |
1544 | kci->last_module_symbol = round_up(kci->last_module_symbol, | |
1545 | page_size); | |
1546 | kci->last_module_symbol += page_size; | |
1547 | } | |
1548 | ||
1549 | if (!kci->stext || !kci->etext) | |
1550 | return -1; | |
1551 | ||
1552 | if (kci->first_module && !kci->last_module_symbol) | |
1553 | return -1; | |
1554 | ||
1555 | return kcore_copy__read_maps(kci, elf); | |
1556 | } | |
1557 | ||
1558 | static int kcore_copy__copy_file(const char *from_dir, const char *to_dir, | |
1559 | const char *name) | |
1560 | { | |
1561 | char from_filename[PATH_MAX]; | |
1562 | char to_filename[PATH_MAX]; | |
1563 | ||
1564 | scnprintf(from_filename, PATH_MAX, "%s/%s", from_dir, name); | |
1565 | scnprintf(to_filename, PATH_MAX, "%s/%s", to_dir, name); | |
1566 | ||
1567 | return copyfile_mode(from_filename, to_filename, 0400); | |
1568 | } | |
1569 | ||
1570 | static int kcore_copy__unlink(const char *dir, const char *name) | |
1571 | { | |
1572 | char filename[PATH_MAX]; | |
1573 | ||
1574 | scnprintf(filename, PATH_MAX, "%s/%s", dir, name); | |
1575 | ||
1576 | return unlink(filename); | |
1577 | } | |
1578 | ||
1579 | static int kcore_copy__compare_fds(int from, int to) | |
1580 | { | |
1581 | char *buf_from; | |
1582 | char *buf_to; | |
1583 | ssize_t ret; | |
1584 | size_t len; | |
1585 | int err = -1; | |
1586 | ||
1587 | buf_from = malloc(page_size); | |
1588 | buf_to = malloc(page_size); | |
1589 | if (!buf_from || !buf_to) | |
1590 | goto out; | |
1591 | ||
1592 | while (1) { | |
1593 | /* Use read because mmap won't work on proc files */ | |
1594 | ret = read(from, buf_from, page_size); | |
1595 | if (ret < 0) | |
1596 | goto out; | |
1597 | ||
1598 | if (!ret) | |
1599 | break; | |
1600 | ||
1601 | len = ret; | |
1602 | ||
1603 | if (readn(to, buf_to, len) != (int)len) | |
1604 | goto out; | |
1605 | ||
1606 | if (memcmp(buf_from, buf_to, len)) | |
1607 | goto out; | |
1608 | } | |
1609 | ||
1610 | err = 0; | |
1611 | out: | |
1612 | free(buf_to); | |
1613 | free(buf_from); | |
1614 | return err; | |
1615 | } | |
1616 | ||
1617 | static int kcore_copy__compare_files(const char *from_filename, | |
1618 | const char *to_filename) | |
1619 | { | |
1620 | int from, to, err = -1; | |
1621 | ||
1622 | from = open(from_filename, O_RDONLY); | |
1623 | if (from < 0) | |
1624 | return -1; | |
1625 | ||
1626 | to = open(to_filename, O_RDONLY); | |
1627 | if (to < 0) | |
1628 | goto out_close_from; | |
1629 | ||
1630 | err = kcore_copy__compare_fds(from, to); | |
1631 | ||
1632 | close(to); | |
1633 | out_close_from: | |
1634 | close(from); | |
1635 | return err; | |
1636 | } | |
1637 | ||
1638 | static int kcore_copy__compare_file(const char *from_dir, const char *to_dir, | |
1639 | const char *name) | |
1640 | { | |
1641 | char from_filename[PATH_MAX]; | |
1642 | char to_filename[PATH_MAX]; | |
1643 | ||
1644 | scnprintf(from_filename, PATH_MAX, "%s/%s", from_dir, name); | |
1645 | scnprintf(to_filename, PATH_MAX, "%s/%s", to_dir, name); | |
1646 | ||
1647 | return kcore_copy__compare_files(from_filename, to_filename); | |
1648 | } | |
1649 | ||
1650 | /** | |
1651 | * kcore_copy - copy kallsyms, modules and kcore from one directory to another. | |
1652 | * @from_dir: from directory | |
1653 | * @to_dir: to directory | |
1654 | * | |
1655 | * This function copies kallsyms, modules and kcore files from one directory to | |
1656 | * another. kallsyms and modules are copied entirely. Only code segments are | |
1657 | * copied from kcore. It is assumed that two segments suffice: one for the | |
1658 | * kernel proper and one for all the modules. The code segments are determined | |
1659 | * from kallsyms and modules files. The kernel map starts at _stext or the | |
1660 | * lowest function symbol, and ends at _etext or the highest function symbol. | |
1661 | * The module map starts at the lowest module address and ends at the highest | |
1662 | * module symbol. Start addresses are rounded down to the nearest page. End | |
1663 | * addresses are rounded up to the nearest page. An extra page is added to the | |
1664 | * highest kernel symbol and highest module symbol to, hopefully, encompass that | |
1665 | * symbol too. Because it contains only code sections, the resulting kcore is | |
1666 | * unusual. One significant peculiarity is that the mapping (start -> pgoff) | |
1667 | * is not the same for the kernel map and the modules map. That happens because | |
1668 | * the data is copied adjacently whereas the original kcore has gaps. Finally, | |
1669 | * kallsyms and modules files are compared with their copies to check that | |
1670 | * modules have not been loaded or unloaded while the copies were taking place. | |
1671 | * | |
1672 | * Return: %0 on success, %-1 on failure. | |
1673 | */ | |
1674 | int kcore_copy(const char *from_dir, const char *to_dir) | |
1675 | { | |
1676 | struct kcore kcore; | |
1677 | struct kcore extract; | |
1678 | size_t count = 2; | |
1679 | int idx = 0, err = -1; | |
1680 | off_t offset = page_size, sz, modules_offset = 0; | |
1681 | struct kcore_copy_info kci = { .stext = 0, }; | |
1682 | char kcore_filename[PATH_MAX]; | |
1683 | char extract_filename[PATH_MAX]; | |
1684 | ||
1685 | if (kcore_copy__copy_file(from_dir, to_dir, "kallsyms")) | |
1686 | return -1; | |
1687 | ||
1688 | if (kcore_copy__copy_file(from_dir, to_dir, "modules")) | |
1689 | goto out_unlink_kallsyms; | |
1690 | ||
1691 | scnprintf(kcore_filename, PATH_MAX, "%s/kcore", from_dir); | |
1692 | scnprintf(extract_filename, PATH_MAX, "%s/kcore", to_dir); | |
1693 | ||
1694 | if (kcore__open(&kcore, kcore_filename)) | |
1695 | goto out_unlink_modules; | |
1696 | ||
1697 | if (kcore_copy__calc_maps(&kci, from_dir, kcore.elf)) | |
1698 | goto out_kcore_close; | |
1699 | ||
1700 | if (kcore__init(&extract, extract_filename, kcore.elfclass, false)) | |
1701 | goto out_kcore_close; | |
1702 | ||
1703 | if (!kci.modules_map.addr) | |
1704 | count -= 1; | |
1705 | ||
1706 | if (kcore__copy_hdr(&kcore, &extract, count)) | |
1707 | goto out_extract_close; | |
1708 | ||
1709 | if (kcore__add_phdr(&extract, idx++, offset, kci.kernel_map.addr, | |
1710 | kci.kernel_map.len)) | |
1711 | goto out_extract_close; | |
1712 | ||
1713 | if (kci.modules_map.addr) { | |
1714 | modules_offset = offset + kci.kernel_map.len; | |
1715 | if (kcore__add_phdr(&extract, idx, modules_offset, | |
1716 | kci.modules_map.addr, kci.modules_map.len)) | |
1717 | goto out_extract_close; | |
1718 | } | |
1719 | ||
1720 | sz = kcore__write(&extract); | |
1721 | if (sz < 0 || sz > offset) | |
1722 | goto out_extract_close; | |
1723 | ||
1724 | if (copy_bytes(kcore.fd, kci.kernel_map.offset, extract.fd, offset, | |
1725 | kci.kernel_map.len)) | |
1726 | goto out_extract_close; | |
1727 | ||
1728 | if (modules_offset && copy_bytes(kcore.fd, kci.modules_map.offset, | |
1729 | extract.fd, modules_offset, | |
1730 | kci.modules_map.len)) | |
1731 | goto out_extract_close; | |
1732 | ||
1733 | if (kcore_copy__compare_file(from_dir, to_dir, "modules")) | |
1734 | goto out_extract_close; | |
1735 | ||
1736 | if (kcore_copy__compare_file(from_dir, to_dir, "kallsyms")) | |
1737 | goto out_extract_close; | |
1738 | ||
1739 | err = 0; | |
1740 | ||
1741 | out_extract_close: | |
1742 | kcore__close(&extract); | |
1743 | if (err) | |
1744 | unlink(extract_filename); | |
1745 | out_kcore_close: | |
1746 | kcore__close(&kcore); | |
1747 | out_unlink_modules: | |
1748 | if (err) | |
1749 | kcore_copy__unlink(to_dir, "modules"); | |
1750 | out_unlink_kallsyms: | |
1751 | if (err) | |
1752 | kcore_copy__unlink(to_dir, "kallsyms"); | |
1753 | ||
1754 | return err; | |
1755 | } | |
1756 | ||
afba19d9 AH |
1757 | int kcore_extract__create(struct kcore_extract *kce) |
1758 | { | |
1759 | struct kcore kcore; | |
1760 | struct kcore extract; | |
1761 | size_t count = 1; | |
1762 | int idx = 0, err = -1; | |
1763 | off_t offset = page_size, sz; | |
1764 | ||
1765 | if (kcore__open(&kcore, kce->kcore_filename)) | |
1766 | return -1; | |
1767 | ||
1768 | strcpy(kce->extract_filename, PERF_KCORE_EXTRACT); | |
1769 | if (kcore__init(&extract, kce->extract_filename, kcore.elfclass, true)) | |
1770 | goto out_kcore_close; | |
1771 | ||
1772 | if (kcore__copy_hdr(&kcore, &extract, count)) | |
1773 | goto out_extract_close; | |
1774 | ||
1775 | if (kcore__add_phdr(&extract, idx, offset, kce->addr, kce->len)) | |
1776 | goto out_extract_close; | |
1777 | ||
1778 | sz = kcore__write(&extract); | |
1779 | if (sz < 0 || sz > offset) | |
1780 | goto out_extract_close; | |
1781 | ||
1782 | if (copy_bytes(kcore.fd, kce->offs, extract.fd, offset, kce->len)) | |
1783 | goto out_extract_close; | |
1784 | ||
1785 | err = 0; | |
1786 | ||
1787 | out_extract_close: | |
1788 | kcore__close(&extract); | |
1789 | if (err) | |
1790 | unlink(kce->extract_filename); | |
1791 | out_kcore_close: | |
1792 | kcore__close(&kcore); | |
1793 | ||
1794 | return err; | |
1795 | } | |
1796 | ||
1797 | void kcore_extract__delete(struct kcore_extract *kce) | |
1798 | { | |
1799 | unlink(kce->extract_filename); | |
1800 | } | |
1801 | ||
1c1a3a47 | 1802 | #ifdef HAVE_GELF_GETNOTE_SUPPORT |
060fa0c7 HK |
1803 | /** |
1804 | * populate_sdt_note : Parse raw data and identify SDT note | |
1805 | * @elf: elf of the opened file | |
1806 | * @data: raw data of a section with description offset applied | |
1807 | * @len: note description size | |
1808 | * @type: type of the note | |
1809 | * @sdt_notes: List to add the SDT note | |
1810 | * | |
1811 | * Responsible for parsing the @data in section .note.stapsdt in @elf and | |
1812 | * if its an SDT note, it appends to @sdt_notes list. | |
1813 | */ | |
1814 | static int populate_sdt_note(Elf **elf, const char *data, size_t len, | |
1815 | struct list_head *sdt_notes) | |
1816 | { | |
1817 | const char *provider, *name; | |
1818 | struct sdt_note *tmp = NULL; | |
1819 | GElf_Ehdr ehdr; | |
1820 | GElf_Addr base_off = 0; | |
1821 | GElf_Shdr shdr; | |
1822 | int ret = -EINVAL; | |
1823 | ||
1824 | union { | |
1825 | Elf64_Addr a64[NR_ADDR]; | |
1826 | Elf32_Addr a32[NR_ADDR]; | |
1827 | } buf; | |
1828 | ||
1829 | Elf_Data dst = { | |
1830 | .d_buf = &buf, .d_type = ELF_T_ADDR, .d_version = EV_CURRENT, | |
1831 | .d_size = gelf_fsize((*elf), ELF_T_ADDR, NR_ADDR, EV_CURRENT), | |
1832 | .d_off = 0, .d_align = 0 | |
1833 | }; | |
1834 | Elf_Data src = { | |
1835 | .d_buf = (void *) data, .d_type = ELF_T_ADDR, | |
1836 | .d_version = EV_CURRENT, .d_size = dst.d_size, .d_off = 0, | |
1837 | .d_align = 0 | |
1838 | }; | |
1839 | ||
1840 | tmp = (struct sdt_note *)calloc(1, sizeof(struct sdt_note)); | |
1841 | if (!tmp) { | |
1842 | ret = -ENOMEM; | |
1843 | goto out_err; | |
1844 | } | |
1845 | ||
1846 | INIT_LIST_HEAD(&tmp->note_list); | |
1847 | ||
1848 | if (len < dst.d_size + 3) | |
1849 | goto out_free_note; | |
1850 | ||
1851 | /* Translation from file representation to memory representation */ | |
1852 | if (gelf_xlatetom(*elf, &dst, &src, | |
1853 | elf_getident(*elf, NULL)[EI_DATA]) == NULL) { | |
1854 | pr_err("gelf_xlatetom : %s\n", elf_errmsg(-1)); | |
1855 | goto out_free_note; | |
1856 | } | |
1857 | ||
1858 | /* Populate the fields of sdt_note */ | |
1859 | provider = data + dst.d_size; | |
1860 | ||
1861 | name = (const char *)memchr(provider, '\0', data + len - provider); | |
1862 | if (name++ == NULL) | |
1863 | goto out_free_note; | |
1864 | ||
1865 | tmp->provider = strdup(provider); | |
1866 | if (!tmp->provider) { | |
1867 | ret = -ENOMEM; | |
1868 | goto out_free_note; | |
1869 | } | |
1870 | tmp->name = strdup(name); | |
1871 | if (!tmp->name) { | |
1872 | ret = -ENOMEM; | |
1873 | goto out_free_prov; | |
1874 | } | |
1875 | ||
1876 | if (gelf_getclass(*elf) == ELFCLASS32) { | |
1877 | memcpy(&tmp->addr, &buf, 3 * sizeof(Elf32_Addr)); | |
1878 | tmp->bit32 = true; | |
1879 | } else { | |
1880 | memcpy(&tmp->addr, &buf, 3 * sizeof(Elf64_Addr)); | |
1881 | tmp->bit32 = false; | |
1882 | } | |
1883 | ||
1884 | if (!gelf_getehdr(*elf, &ehdr)) { | |
1885 | pr_debug("%s : cannot get elf header.\n", __func__); | |
1886 | ret = -EBADF; | |
1887 | goto out_free_name; | |
1888 | } | |
1889 | ||
1890 | /* Adjust the prelink effect : | |
1891 | * Find out the .stapsdt.base section. | |
1892 | * This scn will help us to handle prelinking (if present). | |
1893 | * Compare the retrieved file offset of the base section with the | |
1894 | * base address in the description of the SDT note. If its different, | |
1895 | * then accordingly, adjust the note location. | |
1896 | */ | |
1897 | if (elf_section_by_name(*elf, &ehdr, &shdr, SDT_BASE_SCN, NULL)) { | |
1898 | base_off = shdr.sh_offset; | |
1899 | if (base_off) { | |
1900 | if (tmp->bit32) | |
1901 | tmp->addr.a32[0] = tmp->addr.a32[0] + base_off - | |
1902 | tmp->addr.a32[1]; | |
1903 | else | |
1904 | tmp->addr.a64[0] = tmp->addr.a64[0] + base_off - | |
1905 | tmp->addr.a64[1]; | |
1906 | } | |
1907 | } | |
1908 | ||
1909 | list_add_tail(&tmp->note_list, sdt_notes); | |
1910 | return 0; | |
1911 | ||
1912 | out_free_name: | |
1913 | free(tmp->name); | |
1914 | out_free_prov: | |
1915 | free(tmp->provider); | |
1916 | out_free_note: | |
1917 | free(tmp); | |
1918 | out_err: | |
1919 | return ret; | |
1920 | } | |
1921 | ||
1922 | /** | |
1923 | * construct_sdt_notes_list : constructs a list of SDT notes | |
1924 | * @elf : elf to look into | |
1925 | * @sdt_notes : empty list_head | |
1926 | * | |
1927 | * Scans the sections in 'elf' for the section | |
1928 | * .note.stapsdt. It, then calls populate_sdt_note to find | |
1929 | * out the SDT events and populates the 'sdt_notes'. | |
1930 | */ | |
1931 | static int construct_sdt_notes_list(Elf *elf, struct list_head *sdt_notes) | |
1932 | { | |
1933 | GElf_Ehdr ehdr; | |
1934 | Elf_Scn *scn = NULL; | |
1935 | Elf_Data *data; | |
1936 | GElf_Shdr shdr; | |
1937 | size_t shstrndx, next; | |
1938 | GElf_Nhdr nhdr; | |
1939 | size_t name_off, desc_off, offset; | |
1940 | int ret = 0; | |
1941 | ||
1942 | if (gelf_getehdr(elf, &ehdr) == NULL) { | |
1943 | ret = -EBADF; | |
1944 | goto out_ret; | |
1945 | } | |
1946 | if (elf_getshdrstrndx(elf, &shstrndx) != 0) { | |
1947 | ret = -EBADF; | |
1948 | goto out_ret; | |
1949 | } | |
1950 | ||
1951 | /* Look for the required section */ | |
1952 | scn = elf_section_by_name(elf, &ehdr, &shdr, SDT_NOTE_SCN, NULL); | |
1953 | if (!scn) { | |
1954 | ret = -ENOENT; | |
1955 | goto out_ret; | |
1956 | } | |
1957 | ||
1958 | if ((shdr.sh_type != SHT_NOTE) || (shdr.sh_flags & SHF_ALLOC)) { | |
1959 | ret = -ENOENT; | |
1960 | goto out_ret; | |
1961 | } | |
1962 | ||
1963 | data = elf_getdata(scn, NULL); | |
1964 | ||
1965 | /* Get the SDT notes */ | |
1966 | for (offset = 0; (next = gelf_getnote(data, offset, &nhdr, &name_off, | |
1967 | &desc_off)) > 0; offset = next) { | |
1968 | if (nhdr.n_namesz == sizeof(SDT_NOTE_NAME) && | |
1969 | !memcmp(data->d_buf + name_off, SDT_NOTE_NAME, | |
1970 | sizeof(SDT_NOTE_NAME))) { | |
1971 | /* Check the type of the note */ | |
1972 | if (nhdr.n_type != SDT_NOTE_TYPE) | |
1973 | goto out_ret; | |
1974 | ||
1975 | ret = populate_sdt_note(&elf, ((data->d_buf) + desc_off), | |
1976 | nhdr.n_descsz, sdt_notes); | |
1977 | if (ret < 0) | |
1978 | goto out_ret; | |
1979 | } | |
1980 | } | |
1981 | if (list_empty(sdt_notes)) | |
1982 | ret = -ENOENT; | |
1983 | ||
1984 | out_ret: | |
1985 | return ret; | |
1986 | } | |
1987 | ||
1988 | /** | |
1989 | * get_sdt_note_list : Wrapper to construct a list of sdt notes | |
1990 | * @head : empty list_head | |
1991 | * @target : file to find SDT notes from | |
1992 | * | |
1993 | * This opens the file, initializes | |
1994 | * the ELF and then calls construct_sdt_notes_list. | |
1995 | */ | |
1996 | int get_sdt_note_list(struct list_head *head, const char *target) | |
1997 | { | |
1998 | Elf *elf; | |
1999 | int fd, ret; | |
2000 | ||
2001 | fd = open(target, O_RDONLY); | |
2002 | if (fd < 0) | |
2003 | return -EBADF; | |
2004 | ||
2005 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
2006 | if (!elf) { | |
2007 | ret = -EBADF; | |
2008 | goto out_close; | |
2009 | } | |
2010 | ret = construct_sdt_notes_list(elf, head); | |
2011 | elf_end(elf); | |
2012 | out_close: | |
2013 | close(fd); | |
2014 | return ret; | |
2015 | } | |
2016 | ||
2017 | /** | |
2018 | * cleanup_sdt_note_list : free the sdt notes' list | |
2019 | * @sdt_notes: sdt notes' list | |
2020 | * | |
2021 | * Free up the SDT notes in @sdt_notes. | |
2022 | * Returns the number of SDT notes free'd. | |
2023 | */ | |
2024 | int cleanup_sdt_note_list(struct list_head *sdt_notes) | |
2025 | { | |
2026 | struct sdt_note *tmp, *pos; | |
2027 | int nr_free = 0; | |
2028 | ||
2029 | list_for_each_entry_safe(pos, tmp, sdt_notes, note_list) { | |
2030 | list_del(&pos->note_list); | |
2031 | free(pos->name); | |
2032 | free(pos->provider); | |
2033 | free(pos); | |
2034 | nr_free++; | |
2035 | } | |
2036 | return nr_free; | |
2037 | } | |
2038 | ||
2039 | /** | |
2040 | * sdt_notes__get_count: Counts the number of sdt events | |
2041 | * @start: list_head to sdt_notes list | |
2042 | * | |
2043 | * Returns the number of SDT notes in a list | |
2044 | */ | |
2045 | int sdt_notes__get_count(struct list_head *start) | |
2046 | { | |
2047 | struct sdt_note *sdt_ptr; | |
2048 | int count = 0; | |
2049 | ||
2050 | list_for_each_entry(sdt_ptr, start, note_list) | |
2051 | count++; | |
2052 | return count; | |
2053 | } | |
1c1a3a47 | 2054 | #endif |
060fa0c7 | 2055 | |
e5a1845f NK |
2056 | void symbol__elf_init(void) |
2057 | { | |
2058 | elf_version(EV_CURRENT); | |
2059 | } |