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