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" | |
9 | #include "debug.h" | |
10 | ||
89fe808a | 11 | #ifndef HAVE_ELF_GETPHDRNUM_SUPPORT |
e955d5c4 AH |
12 | static int elf_getphdrnum(Elf *elf, size_t *dst) |
13 | { | |
14 | GElf_Ehdr gehdr; | |
15 | GElf_Ehdr *ehdr; | |
16 | ||
17 | ehdr = gelf_getehdr(elf, &gehdr); | |
18 | if (!ehdr) | |
19 | return -1; | |
20 | ||
21 | *dst = ehdr->e_phnum; | |
22 | ||
23 | return 0; | |
24 | } | |
25 | #endif | |
26 | ||
e5a1845f NK |
27 | #ifndef NT_GNU_BUILD_ID |
28 | #define NT_GNU_BUILD_ID 3 | |
29 | #endif | |
30 | ||
31 | /** | |
32 | * elf_symtab__for_each_symbol - iterate thru all the symbols | |
33 | * | |
34 | * @syms: struct elf_symtab instance to iterate | |
35 | * @idx: uint32_t idx | |
36 | * @sym: GElf_Sym iterator | |
37 | */ | |
38 | #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \ | |
39 | for (idx = 0, gelf_getsym(syms, idx, &sym);\ | |
40 | idx < nr_syms; \ | |
41 | idx++, gelf_getsym(syms, idx, &sym)) | |
42 | ||
43 | static inline uint8_t elf_sym__type(const GElf_Sym *sym) | |
44 | { | |
45 | return GELF_ST_TYPE(sym->st_info); | |
46 | } | |
47 | ||
48 | static inline int elf_sym__is_function(const GElf_Sym *sym) | |
49 | { | |
50 | return elf_sym__type(sym) == STT_FUNC && | |
51 | sym->st_name != 0 && | |
52 | sym->st_shndx != SHN_UNDEF; | |
53 | } | |
54 | ||
55 | static inline bool elf_sym__is_object(const GElf_Sym *sym) | |
56 | { | |
57 | return elf_sym__type(sym) == STT_OBJECT && | |
58 | sym->st_name != 0 && | |
59 | sym->st_shndx != SHN_UNDEF; | |
60 | } | |
61 | ||
62 | static inline int elf_sym__is_label(const GElf_Sym *sym) | |
63 | { | |
64 | return elf_sym__type(sym) == STT_NOTYPE && | |
65 | sym->st_name != 0 && | |
66 | sym->st_shndx != SHN_UNDEF && | |
67 | sym->st_shndx != SHN_ABS; | |
68 | } | |
69 | ||
70 | static bool elf_sym__is_a(GElf_Sym *sym, enum map_type type) | |
71 | { | |
72 | switch (type) { | |
73 | case MAP__FUNCTION: | |
74 | return elf_sym__is_function(sym); | |
75 | case MAP__VARIABLE: | |
76 | return elf_sym__is_object(sym); | |
77 | default: | |
78 | return false; | |
79 | } | |
80 | } | |
81 | ||
82 | static inline const char *elf_sym__name(const GElf_Sym *sym, | |
83 | const Elf_Data *symstrs) | |
84 | { | |
85 | return symstrs->d_buf + sym->st_name; | |
86 | } | |
87 | ||
88 | static inline const char *elf_sec__name(const GElf_Shdr *shdr, | |
89 | const Elf_Data *secstrs) | |
90 | { | |
91 | return secstrs->d_buf + shdr->sh_name; | |
92 | } | |
93 | ||
94 | static inline int elf_sec__is_text(const GElf_Shdr *shdr, | |
95 | const Elf_Data *secstrs) | |
96 | { | |
97 | return strstr(elf_sec__name(shdr, secstrs), "text") != NULL; | |
98 | } | |
99 | ||
100 | static inline bool elf_sec__is_data(const GElf_Shdr *shdr, | |
101 | const Elf_Data *secstrs) | |
102 | { | |
103 | return strstr(elf_sec__name(shdr, secstrs), "data") != NULL; | |
104 | } | |
105 | ||
106 | static bool elf_sec__is_a(GElf_Shdr *shdr, Elf_Data *secstrs, | |
107 | enum map_type type) | |
108 | { | |
109 | switch (type) { | |
110 | case MAP__FUNCTION: | |
111 | return elf_sec__is_text(shdr, secstrs); | |
112 | case MAP__VARIABLE: | |
113 | return elf_sec__is_data(shdr, secstrs); | |
114 | default: | |
115 | return false; | |
116 | } | |
117 | } | |
118 | ||
119 | static size_t elf_addr_to_index(Elf *elf, GElf_Addr addr) | |
120 | { | |
121 | Elf_Scn *sec = NULL; | |
122 | GElf_Shdr shdr; | |
123 | size_t cnt = 1; | |
124 | ||
125 | while ((sec = elf_nextscn(elf, sec)) != NULL) { | |
126 | gelf_getshdr(sec, &shdr); | |
127 | ||
128 | if ((addr >= shdr.sh_addr) && | |
129 | (addr < (shdr.sh_addr + shdr.sh_size))) | |
130 | return cnt; | |
131 | ||
132 | ++cnt; | |
133 | } | |
134 | ||
135 | return -1; | |
136 | } | |
137 | ||
138 | static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep, | |
139 | GElf_Shdr *shp, const char *name, | |
140 | size_t *idx) | |
141 | { | |
142 | Elf_Scn *sec = NULL; | |
143 | size_t cnt = 1; | |
144 | ||
49274654 CS |
145 | /* Elf is corrupted/truncated, avoid calling elf_strptr. */ |
146 | if (!elf_rawdata(elf_getscn(elf, ep->e_shstrndx), NULL)) | |
147 | return NULL; | |
148 | ||
e5a1845f NK |
149 | while ((sec = elf_nextscn(elf, sec)) != NULL) { |
150 | char *str; | |
151 | ||
152 | gelf_getshdr(sec, shp); | |
153 | str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name); | |
154 | if (!strcmp(name, str)) { | |
155 | if (idx) | |
156 | *idx = cnt; | |
157 | break; | |
158 | } | |
159 | ++cnt; | |
160 | } | |
161 | ||
162 | return sec; | |
163 | } | |
164 | ||
165 | #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \ | |
166 | for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \ | |
167 | idx < nr_entries; \ | |
168 | ++idx, pos = gelf_getrel(reldata, idx, &pos_mem)) | |
169 | ||
170 | #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \ | |
171 | for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \ | |
172 | idx < nr_entries; \ | |
173 | ++idx, pos = gelf_getrela(reldata, idx, &pos_mem)) | |
174 | ||
175 | /* | |
176 | * We need to check if we have a .dynsym, so that we can handle the | |
177 | * .plt, synthesizing its symbols, that aren't on the symtabs (be it | |
178 | * .dynsym or .symtab). | |
179 | * And always look at the original dso, not at debuginfo packages, that | |
180 | * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS). | |
181 | */ | |
a44f605b | 182 | int dso__synthesize_plt_symbols(struct dso *dso, struct symsrc *ss, struct map *map, |
e5a1845f NK |
183 | symbol_filter_t filter) |
184 | { | |
185 | uint32_t nr_rel_entries, idx; | |
186 | GElf_Sym sym; | |
187 | u64 plt_offset; | |
188 | GElf_Shdr shdr_plt; | |
189 | struct symbol *f; | |
190 | GElf_Shdr shdr_rel_plt, shdr_dynsym; | |
191 | Elf_Data *reldata, *syms, *symstrs; | |
192 | Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym; | |
193 | size_t dynsym_idx; | |
194 | GElf_Ehdr ehdr; | |
195 | char sympltname[1024]; | |
196 | Elf *elf; | |
a44f605b | 197 | int nr = 0, symidx, err = 0; |
e5a1845f | 198 | |
f47b58b7 DA |
199 | if (!ss->dynsym) |
200 | return 0; | |
201 | ||
a44f605b CS |
202 | elf = ss->elf; |
203 | ehdr = ss->ehdr; | |
e5a1845f | 204 | |
a44f605b CS |
205 | scn_dynsym = ss->dynsym; |
206 | shdr_dynsym = ss->dynshdr; | |
207 | dynsym_idx = ss->dynsym_idx; | |
e5a1845f | 208 | |
e5a1845f NK |
209 | if (scn_dynsym == NULL) |
210 | goto out_elf_end; | |
211 | ||
212 | scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt, | |
213 | ".rela.plt", NULL); | |
214 | if (scn_plt_rel == NULL) { | |
215 | scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt, | |
216 | ".rel.plt", NULL); | |
217 | if (scn_plt_rel == NULL) | |
218 | goto out_elf_end; | |
219 | } | |
220 | ||
221 | err = -1; | |
222 | ||
223 | if (shdr_rel_plt.sh_link != dynsym_idx) | |
224 | goto out_elf_end; | |
225 | ||
226 | if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL) | |
227 | goto out_elf_end; | |
228 | ||
229 | /* | |
230 | * Fetch the relocation section to find the idxes to the GOT | |
231 | * and the symbols in the .dynsym they refer to. | |
232 | */ | |
233 | reldata = elf_getdata(scn_plt_rel, NULL); | |
234 | if (reldata == NULL) | |
235 | goto out_elf_end; | |
236 | ||
237 | syms = elf_getdata(scn_dynsym, NULL); | |
238 | if (syms == NULL) | |
239 | goto out_elf_end; | |
240 | ||
241 | scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link); | |
242 | if (scn_symstrs == NULL) | |
243 | goto out_elf_end; | |
244 | ||
245 | symstrs = elf_getdata(scn_symstrs, NULL); | |
246 | if (symstrs == NULL) | |
247 | goto out_elf_end; | |
248 | ||
52f9ddba CS |
249 | if (symstrs->d_size == 0) |
250 | goto out_elf_end; | |
251 | ||
e5a1845f NK |
252 | nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize; |
253 | plt_offset = shdr_plt.sh_offset; | |
254 | ||
255 | if (shdr_rel_plt.sh_type == SHT_RELA) { | |
256 | GElf_Rela pos_mem, *pos; | |
257 | ||
258 | elf_section__for_each_rela(reldata, pos, pos_mem, idx, | |
259 | nr_rel_entries) { | |
260 | symidx = GELF_R_SYM(pos->r_info); | |
261 | plt_offset += shdr_plt.sh_entsize; | |
262 | gelf_getsym(syms, symidx, &sym); | |
263 | snprintf(sympltname, sizeof(sympltname), | |
264 | "%s@plt", elf_sym__name(&sym, symstrs)); | |
265 | ||
266 | f = symbol__new(plt_offset, shdr_plt.sh_entsize, | |
267 | STB_GLOBAL, sympltname); | |
268 | if (!f) | |
269 | goto out_elf_end; | |
270 | ||
271 | if (filter && filter(map, f)) | |
272 | symbol__delete(f); | |
273 | else { | |
274 | symbols__insert(&dso->symbols[map->type], f); | |
275 | ++nr; | |
276 | } | |
277 | } | |
278 | } else if (shdr_rel_plt.sh_type == SHT_REL) { | |
279 | GElf_Rel pos_mem, *pos; | |
280 | elf_section__for_each_rel(reldata, pos, pos_mem, idx, | |
281 | nr_rel_entries) { | |
282 | symidx = GELF_R_SYM(pos->r_info); | |
283 | plt_offset += shdr_plt.sh_entsize; | |
284 | gelf_getsym(syms, symidx, &sym); | |
285 | snprintf(sympltname, sizeof(sympltname), | |
286 | "%s@plt", elf_sym__name(&sym, symstrs)); | |
287 | ||
288 | f = symbol__new(plt_offset, shdr_plt.sh_entsize, | |
289 | STB_GLOBAL, sympltname); | |
290 | if (!f) | |
291 | goto out_elf_end; | |
292 | ||
293 | if (filter && filter(map, f)) | |
294 | symbol__delete(f); | |
295 | else { | |
296 | symbols__insert(&dso->symbols[map->type], f); | |
297 | ++nr; | |
298 | } | |
299 | } | |
300 | } | |
301 | ||
302 | err = 0; | |
303 | out_elf_end: | |
e5a1845f NK |
304 | if (err == 0) |
305 | return nr; | |
e5a1845f NK |
306 | pr_debug("%s: problems reading %s PLT info.\n", |
307 | __func__, dso->long_name); | |
308 | return 0; | |
309 | } | |
310 | ||
311 | /* | |
312 | * Align offset to 4 bytes as needed for note name and descriptor data. | |
313 | */ | |
314 | #define NOTE_ALIGN(n) (((n) + 3) & -4U) | |
315 | ||
316 | static int elf_read_build_id(Elf *elf, void *bf, size_t size) | |
317 | { | |
318 | int err = -1; | |
319 | GElf_Ehdr ehdr; | |
320 | GElf_Shdr shdr; | |
321 | Elf_Data *data; | |
322 | Elf_Scn *sec; | |
323 | Elf_Kind ek; | |
324 | void *ptr; | |
325 | ||
326 | if (size < BUILD_ID_SIZE) | |
327 | goto out; | |
328 | ||
329 | ek = elf_kind(elf); | |
330 | if (ek != ELF_K_ELF) | |
331 | goto out; | |
332 | ||
333 | if (gelf_getehdr(elf, &ehdr) == NULL) { | |
334 | pr_err("%s: cannot get elf header.\n", __func__); | |
335 | goto out; | |
336 | } | |
337 | ||
338 | /* | |
339 | * Check following sections for notes: | |
340 | * '.note.gnu.build-id' | |
341 | * '.notes' | |
342 | * '.note' (VDSO specific) | |
343 | */ | |
344 | do { | |
345 | sec = elf_section_by_name(elf, &ehdr, &shdr, | |
346 | ".note.gnu.build-id", NULL); | |
347 | if (sec) | |
348 | break; | |
349 | ||
350 | sec = elf_section_by_name(elf, &ehdr, &shdr, | |
351 | ".notes", NULL); | |
352 | if (sec) | |
353 | break; | |
354 | ||
355 | sec = elf_section_by_name(elf, &ehdr, &shdr, | |
356 | ".note", NULL); | |
357 | if (sec) | |
358 | break; | |
359 | ||
360 | return err; | |
361 | ||
362 | } while (0); | |
363 | ||
364 | data = elf_getdata(sec, NULL); | |
365 | if (data == NULL) | |
366 | goto out; | |
367 | ||
368 | ptr = data->d_buf; | |
369 | while (ptr < (data->d_buf + data->d_size)) { | |
370 | GElf_Nhdr *nhdr = ptr; | |
371 | size_t namesz = NOTE_ALIGN(nhdr->n_namesz), | |
372 | descsz = NOTE_ALIGN(nhdr->n_descsz); | |
373 | const char *name; | |
374 | ||
375 | ptr += sizeof(*nhdr); | |
376 | name = ptr; | |
377 | ptr += namesz; | |
378 | if (nhdr->n_type == NT_GNU_BUILD_ID && | |
379 | nhdr->n_namesz == sizeof("GNU")) { | |
380 | if (memcmp(name, "GNU", sizeof("GNU")) == 0) { | |
381 | size_t sz = min(size, descsz); | |
382 | memcpy(bf, ptr, sz); | |
383 | memset(bf + sz, 0, size - sz); | |
384 | err = descsz; | |
385 | break; | |
386 | } | |
387 | } | |
388 | ptr += descsz; | |
389 | } | |
390 | ||
391 | out: | |
392 | return err; | |
393 | } | |
394 | ||
395 | int filename__read_build_id(const char *filename, void *bf, size_t size) | |
396 | { | |
397 | int fd, err = -1; | |
398 | Elf *elf; | |
399 | ||
400 | if (size < BUILD_ID_SIZE) | |
401 | goto out; | |
402 | ||
403 | fd = open(filename, O_RDONLY); | |
404 | if (fd < 0) | |
405 | goto out; | |
406 | ||
407 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
408 | if (elf == NULL) { | |
409 | pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename); | |
410 | goto out_close; | |
411 | } | |
412 | ||
413 | err = elf_read_build_id(elf, bf, size); | |
414 | ||
415 | elf_end(elf); | |
416 | out_close: | |
417 | close(fd); | |
418 | out: | |
419 | return err; | |
420 | } | |
421 | ||
422 | int sysfs__read_build_id(const char *filename, void *build_id, size_t size) | |
423 | { | |
424 | int fd, err = -1; | |
425 | ||
426 | if (size < BUILD_ID_SIZE) | |
427 | goto out; | |
428 | ||
429 | fd = open(filename, O_RDONLY); | |
430 | if (fd < 0) | |
431 | goto out; | |
432 | ||
433 | while (1) { | |
434 | char bf[BUFSIZ]; | |
435 | GElf_Nhdr nhdr; | |
436 | size_t namesz, descsz; | |
437 | ||
438 | if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr)) | |
439 | break; | |
440 | ||
441 | namesz = NOTE_ALIGN(nhdr.n_namesz); | |
442 | descsz = NOTE_ALIGN(nhdr.n_descsz); | |
443 | if (nhdr.n_type == NT_GNU_BUILD_ID && | |
444 | nhdr.n_namesz == sizeof("GNU")) { | |
445 | if (read(fd, bf, namesz) != (ssize_t)namesz) | |
446 | break; | |
447 | if (memcmp(bf, "GNU", sizeof("GNU")) == 0) { | |
448 | size_t sz = min(descsz, size); | |
449 | if (read(fd, build_id, sz) == (ssize_t)sz) { | |
450 | memset(build_id + sz, 0, size - sz); | |
451 | err = 0; | |
452 | break; | |
453 | } | |
454 | } else if (read(fd, bf, descsz) != (ssize_t)descsz) | |
455 | break; | |
456 | } else { | |
457 | int n = namesz + descsz; | |
458 | if (read(fd, bf, n) != n) | |
459 | break; | |
460 | } | |
461 | } | |
462 | close(fd); | |
463 | out: | |
464 | return err; | |
465 | } | |
466 | ||
467 | int filename__read_debuglink(const char *filename, char *debuglink, | |
468 | size_t size) | |
469 | { | |
470 | int fd, err = -1; | |
471 | Elf *elf; | |
472 | GElf_Ehdr ehdr; | |
473 | GElf_Shdr shdr; | |
474 | Elf_Data *data; | |
475 | Elf_Scn *sec; | |
476 | Elf_Kind ek; | |
477 | ||
478 | fd = open(filename, O_RDONLY); | |
479 | if (fd < 0) | |
480 | goto out; | |
481 | ||
482 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
483 | if (elf == NULL) { | |
484 | pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename); | |
485 | goto out_close; | |
486 | } | |
487 | ||
488 | ek = elf_kind(elf); | |
489 | if (ek != ELF_K_ELF) | |
490 | goto out_close; | |
491 | ||
492 | if (gelf_getehdr(elf, &ehdr) == NULL) { | |
493 | pr_err("%s: cannot get elf header.\n", __func__); | |
494 | goto out_close; | |
495 | } | |
496 | ||
497 | sec = elf_section_by_name(elf, &ehdr, &shdr, | |
498 | ".gnu_debuglink", NULL); | |
499 | if (sec == NULL) | |
500 | goto out_close; | |
501 | ||
502 | data = elf_getdata(sec, NULL); | |
503 | if (data == NULL) | |
504 | goto out_close; | |
505 | ||
506 | /* the start of this section is a zero-terminated string */ | |
507 | strncpy(debuglink, data->d_buf, size); | |
508 | ||
509 | elf_end(elf); | |
510 | ||
511 | out_close: | |
512 | close(fd); | |
513 | out: | |
514 | return err; | |
515 | } | |
516 | ||
517 | static int dso__swap_init(struct dso *dso, unsigned char eidata) | |
518 | { | |
519 | static unsigned int const endian = 1; | |
520 | ||
521 | dso->needs_swap = DSO_SWAP__NO; | |
522 | ||
523 | switch (eidata) { | |
524 | case ELFDATA2LSB: | |
525 | /* We are big endian, DSO is little endian. */ | |
526 | if (*(unsigned char const *)&endian != 1) | |
527 | dso->needs_swap = DSO_SWAP__YES; | |
528 | break; | |
529 | ||
530 | case ELFDATA2MSB: | |
531 | /* We are little endian, DSO is big endian. */ | |
532 | if (*(unsigned char const *)&endian != 0) | |
533 | dso->needs_swap = DSO_SWAP__YES; | |
534 | break; | |
535 | ||
536 | default: | |
537 | pr_err("unrecognized DSO data encoding %d\n", eidata); | |
538 | return -EINVAL; | |
539 | } | |
540 | ||
541 | return 0; | |
542 | } | |
543 | ||
3aafe5ae CS |
544 | bool symsrc__possibly_runtime(struct symsrc *ss) |
545 | { | |
546 | return ss->dynsym || ss->opdsec; | |
547 | } | |
548 | ||
d26cd12b CS |
549 | bool symsrc__has_symtab(struct symsrc *ss) |
550 | { | |
551 | return ss->symtab != NULL; | |
552 | } | |
b68e2f91 CS |
553 | |
554 | void symsrc__destroy(struct symsrc *ss) | |
555 | { | |
556 | free(ss->name); | |
557 | elf_end(ss->elf); | |
558 | close(ss->fd); | |
559 | } | |
560 | ||
561 | int symsrc__init(struct symsrc *ss, struct dso *dso, const char *name, | |
562 | enum dso_binary_type type) | |
e5a1845f | 563 | { |
e5a1845f | 564 | int err = -1; |
e5a1845f | 565 | GElf_Ehdr ehdr; |
e5a1845f | 566 | Elf *elf; |
b68e2f91 CS |
567 | int fd; |
568 | ||
569 | fd = open(name, O_RDONLY); | |
570 | if (fd < 0) | |
571 | return -1; | |
e5a1845f NK |
572 | |
573 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
574 | if (elf == NULL) { | |
575 | pr_debug("%s: cannot read %s ELF file.\n", __func__, name); | |
576 | goto out_close; | |
577 | } | |
578 | ||
579 | if (gelf_getehdr(elf, &ehdr) == NULL) { | |
580 | pr_debug("%s: cannot get elf header.\n", __func__); | |
581 | goto out_elf_end; | |
582 | } | |
583 | ||
584 | if (dso__swap_init(dso, ehdr.e_ident[EI_DATA])) | |
585 | goto out_elf_end; | |
586 | ||
587 | /* Always reject images with a mismatched build-id: */ | |
588 | if (dso->has_build_id) { | |
589 | u8 build_id[BUILD_ID_SIZE]; | |
590 | ||
591 | if (elf_read_build_id(elf, build_id, BUILD_ID_SIZE) < 0) | |
592 | goto out_elf_end; | |
593 | ||
594 | if (!dso__build_id_equal(dso, build_id)) | |
595 | goto out_elf_end; | |
596 | } | |
597 | ||
b68e2f91 CS |
598 | ss->symtab = elf_section_by_name(elf, &ehdr, &ss->symshdr, ".symtab", |
599 | NULL); | |
600 | if (ss->symshdr.sh_type != SHT_SYMTAB) | |
601 | ss->symtab = NULL; | |
602 | ||
603 | ss->dynsym_idx = 0; | |
604 | ss->dynsym = elf_section_by_name(elf, &ehdr, &ss->dynshdr, ".dynsym", | |
605 | &ss->dynsym_idx); | |
606 | if (ss->dynshdr.sh_type != SHT_DYNSYM) | |
607 | ss->dynsym = NULL; | |
608 | ||
609 | ss->opdidx = 0; | |
610 | ss->opdsec = elf_section_by_name(elf, &ehdr, &ss->opdshdr, ".opd", | |
611 | &ss->opdidx); | |
612 | if (ss->opdshdr.sh_type != SHT_PROGBITS) | |
613 | ss->opdsec = NULL; | |
614 | ||
615 | if (dso->kernel == DSO_TYPE_USER) { | |
616 | GElf_Shdr shdr; | |
617 | ss->adjust_symbols = (ehdr.e_type == ET_EXEC || | |
0131c4ec | 618 | ehdr.e_type == ET_REL || |
b68e2f91 CS |
619 | elf_section_by_name(elf, &ehdr, &shdr, |
620 | ".gnu.prelink_undo", | |
621 | NULL) != NULL); | |
622 | } else { | |
0131c4ec AH |
623 | ss->adjust_symbols = ehdr.e_type == ET_EXEC || |
624 | ehdr.e_type == ET_REL; | |
b68e2f91 CS |
625 | } |
626 | ||
627 | ss->name = strdup(name); | |
628 | if (!ss->name) | |
629 | goto out_elf_end; | |
630 | ||
631 | ss->elf = elf; | |
632 | ss->fd = fd; | |
633 | ss->ehdr = ehdr; | |
634 | ss->type = type; | |
635 | ||
636 | return 0; | |
637 | ||
638 | out_elf_end: | |
639 | elf_end(elf); | |
640 | out_close: | |
641 | close(fd); | |
642 | return err; | |
643 | } | |
644 | ||
39b12f78 AH |
645 | /** |
646 | * ref_reloc_sym_not_found - has kernel relocation symbol been found. | |
647 | * @kmap: kernel maps and relocation reference symbol | |
648 | * | |
649 | * This function returns %true if we are dealing with the kernel maps and the | |
650 | * relocation reference symbol has not yet been found. Otherwise %false is | |
651 | * returned. | |
652 | */ | |
653 | static bool ref_reloc_sym_not_found(struct kmap *kmap) | |
654 | { | |
655 | return kmap && kmap->ref_reloc_sym && kmap->ref_reloc_sym->name && | |
656 | !kmap->ref_reloc_sym->unrelocated_addr; | |
657 | } | |
658 | ||
659 | /** | |
660 | * ref_reloc - kernel relocation offset. | |
661 | * @kmap: kernel maps and relocation reference symbol | |
662 | * | |
663 | * This function returns the offset of kernel addresses as determined by using | |
664 | * the relocation reference symbol i.e. if the kernel has not been relocated | |
665 | * then the return value is zero. | |
666 | */ | |
667 | static u64 ref_reloc(struct kmap *kmap) | |
668 | { | |
669 | if (kmap && kmap->ref_reloc_sym && | |
670 | kmap->ref_reloc_sym->unrelocated_addr) | |
671 | return kmap->ref_reloc_sym->addr - | |
672 | kmap->ref_reloc_sym->unrelocated_addr; | |
673 | return 0; | |
674 | } | |
675 | ||
261360b6 CS |
676 | int dso__load_sym(struct dso *dso, struct map *map, |
677 | struct symsrc *syms_ss, struct symsrc *runtime_ss, | |
d26cd12b | 678 | symbol_filter_t filter, int kmodule) |
b68e2f91 CS |
679 | { |
680 | struct kmap *kmap = dso->kernel ? map__kmap(map) : NULL; | |
681 | struct map *curr_map = map; | |
682 | struct dso *curr_dso = dso; | |
683 | Elf_Data *symstrs, *secstrs; | |
684 | uint32_t nr_syms; | |
685 | int err = -1; | |
686 | uint32_t idx; | |
687 | GElf_Ehdr ehdr; | |
261360b6 | 688 | GElf_Shdr shdr; |
b68e2f91 CS |
689 | Elf_Data *syms, *opddata = NULL; |
690 | GElf_Sym sym; | |
261360b6 | 691 | Elf_Scn *sec, *sec_strndx; |
b68e2f91 CS |
692 | Elf *elf; |
693 | int nr = 0; | |
39b12f78 | 694 | bool remap_kernel = false, adjust_kernel_syms = false; |
b68e2f91 | 695 | |
261360b6 | 696 | dso->symtab_type = syms_ss->type; |
0131c4ec AH |
697 | dso->rel = syms_ss->ehdr.e_type == ET_REL; |
698 | ||
699 | /* | |
700 | * Modules may already have symbols from kallsyms, but those symbols | |
701 | * have the wrong values for the dso maps, so remove them. | |
702 | */ | |
703 | if (kmodule && syms_ss->symtab) | |
704 | symbols__delete(&dso->symbols[map->type]); | |
005f9294 | 705 | |
261360b6 CS |
706 | if (!syms_ss->symtab) { |
707 | syms_ss->symtab = syms_ss->dynsym; | |
708 | syms_ss->symshdr = syms_ss->dynshdr; | |
d26cd12b CS |
709 | } |
710 | ||
261360b6 CS |
711 | elf = syms_ss->elf; |
712 | ehdr = syms_ss->ehdr; | |
713 | sec = syms_ss->symtab; | |
714 | shdr = syms_ss->symshdr; | |
b68e2f91 | 715 | |
261360b6 CS |
716 | if (runtime_ss->opdsec) |
717 | opddata = elf_rawdata(runtime_ss->opdsec, NULL); | |
e5a1845f NK |
718 | |
719 | syms = elf_getdata(sec, NULL); | |
720 | if (syms == NULL) | |
721 | goto out_elf_end; | |
722 | ||
723 | sec = elf_getscn(elf, shdr.sh_link); | |
724 | if (sec == NULL) | |
725 | goto out_elf_end; | |
726 | ||
727 | symstrs = elf_getdata(sec, NULL); | |
728 | if (symstrs == NULL) | |
729 | goto out_elf_end; | |
730 | ||
731 | sec_strndx = elf_getscn(elf, ehdr.e_shstrndx); | |
732 | if (sec_strndx == NULL) | |
733 | goto out_elf_end; | |
734 | ||
735 | secstrs = elf_getdata(sec_strndx, NULL); | |
736 | if (secstrs == NULL) | |
737 | goto out_elf_end; | |
738 | ||
739 | nr_syms = shdr.sh_size / shdr.sh_entsize; | |
740 | ||
741 | memset(&sym, 0, sizeof(sym)); | |
39b12f78 AH |
742 | |
743 | /* | |
744 | * The kernel relocation symbol is needed in advance in order to adjust | |
745 | * kernel maps correctly. | |
746 | */ | |
747 | if (ref_reloc_sym_not_found(kmap)) { | |
748 | elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) { | |
749 | const char *elf_name = elf_sym__name(&sym, symstrs); | |
750 | ||
751 | if (strcmp(elf_name, kmap->ref_reloc_sym->name)) | |
752 | continue; | |
753 | kmap->ref_reloc_sym->unrelocated_addr = sym.st_value; | |
754 | break; | |
755 | } | |
756 | } | |
757 | ||
758 | dso->adjust_symbols = runtime_ss->adjust_symbols || ref_reloc(kmap); | |
759 | /* | |
760 | * Initial kernel and module mappings do not map to the dso. For | |
761 | * function mappings, flag the fixups. | |
762 | */ | |
763 | if (map->type == MAP__FUNCTION && (dso->kernel || kmodule)) { | |
764 | remap_kernel = true; | |
765 | adjust_kernel_syms = dso->adjust_symbols; | |
766 | } | |
e5a1845f NK |
767 | elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) { |
768 | struct symbol *f; | |
769 | const char *elf_name = elf_sym__name(&sym, symstrs); | |
770 | char *demangled = NULL; | |
771 | int is_label = elf_sym__is_label(&sym); | |
772 | const char *section_name; | |
261360b6 | 773 | bool used_opd = false; |
e5a1845f | 774 | |
e5a1845f NK |
775 | if (!is_label && !elf_sym__is_a(&sym, map->type)) |
776 | continue; | |
777 | ||
778 | /* Reject ARM ELF "mapping symbols": these aren't unique and | |
779 | * don't identify functions, so will confuse the profile | |
780 | * output: */ | |
781 | if (ehdr.e_machine == EM_ARM) { | |
782 | if (!strcmp(elf_name, "$a") || | |
783 | !strcmp(elf_name, "$d") || | |
784 | !strcmp(elf_name, "$t")) | |
785 | continue; | |
786 | } | |
787 | ||
261360b6 CS |
788 | if (runtime_ss->opdsec && sym.st_shndx == runtime_ss->opdidx) { |
789 | u32 offset = sym.st_value - syms_ss->opdshdr.sh_addr; | |
e5a1845f NK |
790 | u64 *opd = opddata->d_buf + offset; |
791 | sym.st_value = DSO__SWAP(dso, u64, *opd); | |
261360b6 CS |
792 | sym.st_shndx = elf_addr_to_index(runtime_ss->elf, |
793 | sym.st_value); | |
794 | used_opd = true; | |
e5a1845f | 795 | } |
3843b05d NK |
796 | /* |
797 | * When loading symbols in a data mapping, ABS symbols (which | |
798 | * has a value of SHN_ABS in its st_shndx) failed at | |
799 | * elf_getscn(). And it marks the loading as a failure so | |
800 | * already loaded symbols cannot be fixed up. | |
801 | * | |
802 | * I'm not sure what should be done. Just ignore them for now. | |
803 | * - Namhyung Kim | |
804 | */ | |
805 | if (sym.st_shndx == SHN_ABS) | |
806 | continue; | |
e5a1845f | 807 | |
261360b6 | 808 | sec = elf_getscn(runtime_ss->elf, sym.st_shndx); |
e5a1845f NK |
809 | if (!sec) |
810 | goto out_elf_end; | |
811 | ||
812 | gelf_getshdr(sec, &shdr); | |
813 | ||
814 | if (is_label && !elf_sec__is_a(&shdr, secstrs, map->type)) | |
815 | continue; | |
816 | ||
817 | section_name = elf_sec__name(&shdr, secstrs); | |
818 | ||
819 | /* On ARM, symbols for thumb functions have 1 added to | |
820 | * the symbol address as a flag - remove it */ | |
821 | if ((ehdr.e_machine == EM_ARM) && | |
822 | (map->type == MAP__FUNCTION) && | |
823 | (sym.st_value & 1)) | |
824 | --sym.st_value; | |
825 | ||
39b12f78 | 826 | if (dso->kernel || kmodule) { |
e5a1845f NK |
827 | char dso_name[PATH_MAX]; |
828 | ||
39b12f78 AH |
829 | /* Adjust symbol to map to file offset */ |
830 | if (adjust_kernel_syms) | |
831 | sym.st_value -= shdr.sh_addr - shdr.sh_offset; | |
832 | ||
e5a1845f NK |
833 | if (strcmp(section_name, |
834 | (curr_dso->short_name + | |
835 | dso->short_name_len)) == 0) | |
836 | goto new_symbol; | |
837 | ||
838 | if (strcmp(section_name, ".text") == 0) { | |
39b12f78 AH |
839 | /* |
840 | * The initial kernel mapping is based on | |
841 | * kallsyms and identity maps. Overwrite it to | |
842 | * map to the kernel dso. | |
843 | */ | |
844 | if (remap_kernel && dso->kernel) { | |
845 | remap_kernel = false; | |
846 | map->start = shdr.sh_addr + | |
847 | ref_reloc(kmap); | |
848 | map->end = map->start + shdr.sh_size; | |
849 | map->pgoff = shdr.sh_offset; | |
850 | map->map_ip = map__map_ip; | |
851 | map->unmap_ip = map__unmap_ip; | |
852 | /* Ensure maps are correctly ordered */ | |
853 | map_groups__remove(kmap->kmaps, map); | |
854 | map_groups__insert(kmap->kmaps, map); | |
855 | } | |
856 | ||
0131c4ec AH |
857 | /* |
858 | * The initial module mapping is based on | |
859 | * /proc/modules mapped to offset zero. | |
860 | * Overwrite it to map to the module dso. | |
861 | */ | |
862 | if (remap_kernel && kmodule) { | |
863 | remap_kernel = false; | |
864 | map->pgoff = shdr.sh_offset; | |
865 | } | |
866 | ||
e5a1845f NK |
867 | curr_map = map; |
868 | curr_dso = dso; | |
869 | goto new_symbol; | |
870 | } | |
871 | ||
0131c4ec AH |
872 | if (!kmap) |
873 | goto new_symbol; | |
874 | ||
e5a1845f NK |
875 | snprintf(dso_name, sizeof(dso_name), |
876 | "%s%s", dso->short_name, section_name); | |
877 | ||
878 | curr_map = map_groups__find_by_name(kmap->kmaps, map->type, dso_name); | |
879 | if (curr_map == NULL) { | |
880 | u64 start = sym.st_value; | |
881 | ||
882 | if (kmodule) | |
883 | start += map->start + shdr.sh_offset; | |
884 | ||
885 | curr_dso = dso__new(dso_name); | |
886 | if (curr_dso == NULL) | |
887 | goto out_elf_end; | |
888 | curr_dso->kernel = dso->kernel; | |
889 | curr_dso->long_name = dso->long_name; | |
890 | curr_dso->long_name_len = dso->long_name_len; | |
891 | curr_map = map__new2(start, curr_dso, | |
892 | map->type); | |
893 | if (curr_map == NULL) { | |
894 | dso__delete(curr_dso); | |
895 | goto out_elf_end; | |
896 | } | |
39b12f78 AH |
897 | if (adjust_kernel_syms) { |
898 | curr_map->start = shdr.sh_addr + | |
899 | ref_reloc(kmap); | |
900 | curr_map->end = curr_map->start + | |
901 | shdr.sh_size; | |
902 | curr_map->pgoff = shdr.sh_offset; | |
903 | } else { | |
904 | curr_map->map_ip = identity__map_ip; | |
905 | curr_map->unmap_ip = identity__map_ip; | |
906 | } | |
e5a1845f NK |
907 | curr_dso->symtab_type = dso->symtab_type; |
908 | map_groups__insert(kmap->kmaps, curr_map); | |
909 | dsos__add(&dso->node, curr_dso); | |
910 | dso__set_loaded(curr_dso, map->type); | |
911 | } else | |
912 | curr_dso = curr_map->dso; | |
913 | ||
914 | goto new_symbol; | |
915 | } | |
916 | ||
261360b6 CS |
917 | if ((used_opd && runtime_ss->adjust_symbols) |
918 | || (!used_opd && syms_ss->adjust_symbols)) { | |
e5a1845f NK |
919 | pr_debug4("%s: adjusting symbol: st_value: %#" PRIx64 " " |
920 | "sh_addr: %#" PRIx64 " sh_offset: %#" PRIx64 "\n", __func__, | |
921 | (u64)sym.st_value, (u64)shdr.sh_addr, | |
922 | (u64)shdr.sh_offset); | |
923 | sym.st_value -= shdr.sh_addr - shdr.sh_offset; | |
924 | } | |
925 | /* | |
926 | * We need to figure out if the object was created from C++ sources | |
927 | * DWARF DW_compile_unit has this, but we don't always have access | |
928 | * to it... | |
929 | */ | |
328ccdac | 930 | if (symbol_conf.demangle) { |
14951f22 | 931 | demangled = bfd_demangle(NULL, elf_name, |
328ccdac NK |
932 | DMGL_PARAMS | DMGL_ANSI); |
933 | if (demangled != NULL) | |
934 | elf_name = demangled; | |
935 | } | |
e5a1845f NK |
936 | new_symbol: |
937 | f = symbol__new(sym.st_value, sym.st_size, | |
938 | GELF_ST_BIND(sym.st_info), elf_name); | |
939 | free(demangled); | |
940 | if (!f) | |
941 | goto out_elf_end; | |
942 | ||
943 | if (filter && filter(curr_map, f)) | |
944 | symbol__delete(f); | |
945 | else { | |
946 | symbols__insert(&curr_dso->symbols[curr_map->type], f); | |
947 | nr++; | |
948 | } | |
949 | } | |
950 | ||
951 | /* | |
952 | * For misannotated, zeroed, ASM function sizes. | |
953 | */ | |
954 | if (nr > 0) { | |
955 | symbols__fixup_duplicate(&dso->symbols[map->type]); | |
956 | symbols__fixup_end(&dso->symbols[map->type]); | |
957 | if (kmap) { | |
958 | /* | |
959 | * We need to fixup this here too because we create new | |
960 | * maps here, for things like vsyscall sections. | |
961 | */ | |
962 | __map_groups__fixup_end(kmap->kmaps, map->type); | |
963 | } | |
964 | } | |
965 | err = nr; | |
966 | out_elf_end: | |
e5a1845f NK |
967 | return err; |
968 | } | |
969 | ||
8e0cf965 AH |
970 | static int elf_read_maps(Elf *elf, bool exe, mapfn_t mapfn, void *data) |
971 | { | |
972 | GElf_Phdr phdr; | |
973 | size_t i, phdrnum; | |
974 | int err; | |
975 | u64 sz; | |
976 | ||
977 | if (elf_getphdrnum(elf, &phdrnum)) | |
978 | return -1; | |
979 | ||
980 | for (i = 0; i < phdrnum; i++) { | |
981 | if (gelf_getphdr(elf, i, &phdr) == NULL) | |
982 | return -1; | |
983 | if (phdr.p_type != PT_LOAD) | |
984 | continue; | |
985 | if (exe) { | |
986 | if (!(phdr.p_flags & PF_X)) | |
987 | continue; | |
988 | } else { | |
989 | if (!(phdr.p_flags & PF_R)) | |
990 | continue; | |
991 | } | |
992 | sz = min(phdr.p_memsz, phdr.p_filesz); | |
993 | if (!sz) | |
994 | continue; | |
995 | err = mapfn(phdr.p_vaddr, sz, phdr.p_offset, data); | |
996 | if (err) | |
997 | return err; | |
998 | } | |
999 | return 0; | |
1000 | } | |
1001 | ||
1002 | int file__read_maps(int fd, bool exe, mapfn_t mapfn, void *data, | |
1003 | bool *is_64_bit) | |
1004 | { | |
1005 | int err; | |
1006 | Elf *elf; | |
1007 | ||
1008 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
1009 | if (elf == NULL) | |
1010 | return -1; | |
1011 | ||
1012 | if (is_64_bit) | |
1013 | *is_64_bit = (gelf_getclass(elf) == ELFCLASS64); | |
1014 | ||
1015 | err = elf_read_maps(elf, exe, mapfn, data); | |
1016 | ||
1017 | elf_end(elf); | |
1018 | return err; | |
1019 | } | |
1020 | ||
afba19d9 AH |
1021 | static int copy_bytes(int from, off_t from_offs, int to, off_t to_offs, u64 len) |
1022 | { | |
1023 | ssize_t r; | |
1024 | size_t n; | |
1025 | int err = -1; | |
1026 | char *buf = malloc(page_size); | |
1027 | ||
1028 | if (buf == NULL) | |
1029 | return -1; | |
1030 | ||
1031 | if (lseek(to, to_offs, SEEK_SET) != to_offs) | |
1032 | goto out; | |
1033 | ||
1034 | if (lseek(from, from_offs, SEEK_SET) != from_offs) | |
1035 | goto out; | |
1036 | ||
1037 | while (len) { | |
1038 | n = page_size; | |
1039 | if (len < n) | |
1040 | n = len; | |
1041 | /* Use read because mmap won't work on proc files */ | |
1042 | r = read(from, buf, n); | |
1043 | if (r < 0) | |
1044 | goto out; | |
1045 | if (!r) | |
1046 | break; | |
1047 | n = r; | |
1048 | r = write(to, buf, n); | |
1049 | if (r < 0) | |
1050 | goto out; | |
1051 | if ((size_t)r != n) | |
1052 | goto out; | |
1053 | len -= n; | |
1054 | } | |
1055 | ||
1056 | err = 0; | |
1057 | out: | |
1058 | free(buf); | |
1059 | return err; | |
1060 | } | |
1061 | ||
1062 | struct kcore { | |
1063 | int fd; | |
1064 | int elfclass; | |
1065 | Elf *elf; | |
1066 | GElf_Ehdr ehdr; | |
1067 | }; | |
1068 | ||
1069 | static int kcore__open(struct kcore *kcore, const char *filename) | |
1070 | { | |
1071 | GElf_Ehdr *ehdr; | |
1072 | ||
1073 | kcore->fd = open(filename, O_RDONLY); | |
1074 | if (kcore->fd == -1) | |
1075 | return -1; | |
1076 | ||
1077 | kcore->elf = elf_begin(kcore->fd, ELF_C_READ, NULL); | |
1078 | if (!kcore->elf) | |
1079 | goto out_close; | |
1080 | ||
1081 | kcore->elfclass = gelf_getclass(kcore->elf); | |
1082 | if (kcore->elfclass == ELFCLASSNONE) | |
1083 | goto out_end; | |
1084 | ||
1085 | ehdr = gelf_getehdr(kcore->elf, &kcore->ehdr); | |
1086 | if (!ehdr) | |
1087 | goto out_end; | |
1088 | ||
1089 | return 0; | |
1090 | ||
1091 | out_end: | |
1092 | elf_end(kcore->elf); | |
1093 | out_close: | |
1094 | close(kcore->fd); | |
1095 | return -1; | |
1096 | } | |
1097 | ||
1098 | static int kcore__init(struct kcore *kcore, char *filename, int elfclass, | |
1099 | bool temp) | |
1100 | { | |
1101 | GElf_Ehdr *ehdr; | |
1102 | ||
1103 | kcore->elfclass = elfclass; | |
1104 | ||
1105 | if (temp) | |
1106 | kcore->fd = mkstemp(filename); | |
1107 | else | |
1108 | kcore->fd = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0400); | |
1109 | if (kcore->fd == -1) | |
1110 | return -1; | |
1111 | ||
1112 | kcore->elf = elf_begin(kcore->fd, ELF_C_WRITE, NULL); | |
1113 | if (!kcore->elf) | |
1114 | goto out_close; | |
1115 | ||
1116 | if (!gelf_newehdr(kcore->elf, elfclass)) | |
1117 | goto out_end; | |
1118 | ||
1119 | ehdr = gelf_getehdr(kcore->elf, &kcore->ehdr); | |
1120 | if (!ehdr) | |
1121 | goto out_end; | |
1122 | ||
1123 | return 0; | |
1124 | ||
1125 | out_end: | |
1126 | elf_end(kcore->elf); | |
1127 | out_close: | |
1128 | close(kcore->fd); | |
1129 | unlink(filename); | |
1130 | return -1; | |
1131 | } | |
1132 | ||
1133 | static void kcore__close(struct kcore *kcore) | |
1134 | { | |
1135 | elf_end(kcore->elf); | |
1136 | close(kcore->fd); | |
1137 | } | |
1138 | ||
1139 | static int kcore__copy_hdr(struct kcore *from, struct kcore *to, size_t count) | |
1140 | { | |
1141 | GElf_Ehdr *ehdr = &to->ehdr; | |
1142 | GElf_Ehdr *kehdr = &from->ehdr; | |
1143 | ||
1144 | memcpy(ehdr->e_ident, kehdr->e_ident, EI_NIDENT); | |
1145 | ehdr->e_type = kehdr->e_type; | |
1146 | ehdr->e_machine = kehdr->e_machine; | |
1147 | ehdr->e_version = kehdr->e_version; | |
1148 | ehdr->e_entry = 0; | |
1149 | ehdr->e_shoff = 0; | |
1150 | ehdr->e_flags = kehdr->e_flags; | |
1151 | ehdr->e_phnum = count; | |
1152 | ehdr->e_shentsize = 0; | |
1153 | ehdr->e_shnum = 0; | |
1154 | ehdr->e_shstrndx = 0; | |
1155 | ||
1156 | if (from->elfclass == ELFCLASS32) { | |
1157 | ehdr->e_phoff = sizeof(Elf32_Ehdr); | |
1158 | ehdr->e_ehsize = sizeof(Elf32_Ehdr); | |
1159 | ehdr->e_phentsize = sizeof(Elf32_Phdr); | |
1160 | } else { | |
1161 | ehdr->e_phoff = sizeof(Elf64_Ehdr); | |
1162 | ehdr->e_ehsize = sizeof(Elf64_Ehdr); | |
1163 | ehdr->e_phentsize = sizeof(Elf64_Phdr); | |
1164 | } | |
1165 | ||
1166 | if (!gelf_update_ehdr(to->elf, ehdr)) | |
1167 | return -1; | |
1168 | ||
1169 | if (!gelf_newphdr(to->elf, count)) | |
1170 | return -1; | |
1171 | ||
1172 | return 0; | |
1173 | } | |
1174 | ||
1175 | static int kcore__add_phdr(struct kcore *kcore, int idx, off_t offset, | |
1176 | u64 addr, u64 len) | |
1177 | { | |
1178 | GElf_Phdr gphdr; | |
1179 | GElf_Phdr *phdr; | |
1180 | ||
1181 | phdr = gelf_getphdr(kcore->elf, idx, &gphdr); | |
1182 | if (!phdr) | |
1183 | return -1; | |
1184 | ||
1185 | phdr->p_type = PT_LOAD; | |
1186 | phdr->p_flags = PF_R | PF_W | PF_X; | |
1187 | phdr->p_offset = offset; | |
1188 | phdr->p_vaddr = addr; | |
1189 | phdr->p_paddr = 0; | |
1190 | phdr->p_filesz = len; | |
1191 | phdr->p_memsz = len; | |
1192 | phdr->p_align = page_size; | |
1193 | ||
1194 | if (!gelf_update_phdr(kcore->elf, idx, phdr)) | |
1195 | return -1; | |
1196 | ||
1197 | return 0; | |
1198 | } | |
1199 | ||
1200 | static off_t kcore__write(struct kcore *kcore) | |
1201 | { | |
1202 | return elf_update(kcore->elf, ELF_C_WRITE); | |
1203 | } | |
1204 | ||
1205 | int kcore_extract__create(struct kcore_extract *kce) | |
1206 | { | |
1207 | struct kcore kcore; | |
1208 | struct kcore extract; | |
1209 | size_t count = 1; | |
1210 | int idx = 0, err = -1; | |
1211 | off_t offset = page_size, sz; | |
1212 | ||
1213 | if (kcore__open(&kcore, kce->kcore_filename)) | |
1214 | return -1; | |
1215 | ||
1216 | strcpy(kce->extract_filename, PERF_KCORE_EXTRACT); | |
1217 | if (kcore__init(&extract, kce->extract_filename, kcore.elfclass, true)) | |
1218 | goto out_kcore_close; | |
1219 | ||
1220 | if (kcore__copy_hdr(&kcore, &extract, count)) | |
1221 | goto out_extract_close; | |
1222 | ||
1223 | if (kcore__add_phdr(&extract, idx, offset, kce->addr, kce->len)) | |
1224 | goto out_extract_close; | |
1225 | ||
1226 | sz = kcore__write(&extract); | |
1227 | if (sz < 0 || sz > offset) | |
1228 | goto out_extract_close; | |
1229 | ||
1230 | if (copy_bytes(kcore.fd, kce->offs, extract.fd, offset, kce->len)) | |
1231 | goto out_extract_close; | |
1232 | ||
1233 | err = 0; | |
1234 | ||
1235 | out_extract_close: | |
1236 | kcore__close(&extract); | |
1237 | if (err) | |
1238 | unlink(kce->extract_filename); | |
1239 | out_kcore_close: | |
1240 | kcore__close(&kcore); | |
1241 | ||
1242 | return err; | |
1243 | } | |
1244 | ||
1245 | void kcore_extract__delete(struct kcore_extract *kce) | |
1246 | { | |
1247 | unlink(kce->extract_filename); | |
1248 | } | |
1249 | ||
e5a1845f NK |
1250 | void symbol__elf_init(void) |
1251 | { | |
1252 | elf_version(EV_CURRENT); | |
1253 | } |