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" | |
8fa7d87f | 9 | #include "machine.h" |
922d0e4d | 10 | #include "vdso.h" |
c506c96b | 11 | #include <symbol/kallsyms.h> |
e5a1845f NK |
12 | #include "debug.h" |
13 | ||
e370a3d5 DA |
14 | #ifndef EM_AARCH64 |
15 | #define EM_AARCH64 183 /* ARM 64 bit */ | |
16 | #endif | |
17 | ||
18 | ||
aaba4e12 ACM |
19 | #ifdef HAVE_CPLUS_DEMANGLE_SUPPORT |
20 | extern char *cplus_demangle(const char *, int); | |
21 | ||
22 | static inline char *bfd_demangle(void __maybe_unused *v, const char *c, int i) | |
23 | { | |
24 | return cplus_demangle(c, i); | |
25 | } | |
26 | #else | |
27 | #ifdef NO_DEMANGLE | |
28 | static inline char *bfd_demangle(void __maybe_unused *v, | |
29 | const char __maybe_unused *c, | |
30 | int __maybe_unused i) | |
31 | { | |
32 | return NULL; | |
33 | } | |
34 | #else | |
35 | #define PACKAGE 'perf' | |
36 | #include <bfd.h> | |
37 | #endif | |
38 | #endif | |
39 | ||
89fe808a | 40 | #ifndef HAVE_ELF_GETPHDRNUM_SUPPORT |
179f36dd | 41 | static int elf_getphdrnum(Elf *elf, size_t *dst) |
e955d5c4 AH |
42 | { |
43 | GElf_Ehdr gehdr; | |
44 | GElf_Ehdr *ehdr; | |
45 | ||
46 | ehdr = gelf_getehdr(elf, &gehdr); | |
47 | if (!ehdr) | |
48 | return -1; | |
49 | ||
50 | *dst = ehdr->e_phnum; | |
51 | ||
52 | return 0; | |
53 | } | |
54 | #endif | |
55 | ||
e5a1845f NK |
56 | #ifndef NT_GNU_BUILD_ID |
57 | #define NT_GNU_BUILD_ID 3 | |
58 | #endif | |
59 | ||
60 | /** | |
61 | * elf_symtab__for_each_symbol - iterate thru all the symbols | |
62 | * | |
63 | * @syms: struct elf_symtab instance to iterate | |
64 | * @idx: uint32_t idx | |
65 | * @sym: GElf_Sym iterator | |
66 | */ | |
67 | #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \ | |
68 | for (idx = 0, gelf_getsym(syms, idx, &sym);\ | |
69 | idx < nr_syms; \ | |
70 | idx++, gelf_getsym(syms, idx, &sym)) | |
71 | ||
72 | static inline uint8_t elf_sym__type(const GElf_Sym *sym) | |
73 | { | |
74 | return GELF_ST_TYPE(sym->st_info); | |
75 | } | |
76 | ||
4e31050f VL |
77 | #ifndef STT_GNU_IFUNC |
78 | #define STT_GNU_IFUNC 10 | |
79 | #endif | |
80 | ||
e5a1845f NK |
81 | static inline int elf_sym__is_function(const GElf_Sym *sym) |
82 | { | |
a2f3b6bf AH |
83 | return (elf_sym__type(sym) == STT_FUNC || |
84 | elf_sym__type(sym) == STT_GNU_IFUNC) && | |
e5a1845f NK |
85 | sym->st_name != 0 && |
86 | sym->st_shndx != SHN_UNDEF; | |
87 | } | |
88 | ||
89 | static inline bool elf_sym__is_object(const GElf_Sym *sym) | |
90 | { | |
91 | return elf_sym__type(sym) == STT_OBJECT && | |
92 | sym->st_name != 0 && | |
93 | sym->st_shndx != SHN_UNDEF; | |
94 | } | |
95 | ||
96 | static inline int elf_sym__is_label(const GElf_Sym *sym) | |
97 | { | |
98 | return elf_sym__type(sym) == STT_NOTYPE && | |
99 | sym->st_name != 0 && | |
100 | sym->st_shndx != SHN_UNDEF && | |
101 | sym->st_shndx != SHN_ABS; | |
102 | } | |
103 | ||
104 | static bool elf_sym__is_a(GElf_Sym *sym, enum map_type type) | |
105 | { | |
106 | switch (type) { | |
107 | case MAP__FUNCTION: | |
108 | return elf_sym__is_function(sym); | |
109 | case MAP__VARIABLE: | |
110 | return elf_sym__is_object(sym); | |
111 | default: | |
112 | return false; | |
113 | } | |
114 | } | |
115 | ||
116 | static inline const char *elf_sym__name(const GElf_Sym *sym, | |
117 | const Elf_Data *symstrs) | |
118 | { | |
119 | return symstrs->d_buf + sym->st_name; | |
120 | } | |
121 | ||
122 | static inline const char *elf_sec__name(const GElf_Shdr *shdr, | |
123 | const Elf_Data *secstrs) | |
124 | { | |
125 | return secstrs->d_buf + shdr->sh_name; | |
126 | } | |
127 | ||
128 | static inline int elf_sec__is_text(const GElf_Shdr *shdr, | |
129 | const Elf_Data *secstrs) | |
130 | { | |
131 | return strstr(elf_sec__name(shdr, secstrs), "text") != NULL; | |
132 | } | |
133 | ||
134 | static inline bool elf_sec__is_data(const GElf_Shdr *shdr, | |
135 | const Elf_Data *secstrs) | |
136 | { | |
137 | return strstr(elf_sec__name(shdr, secstrs), "data") != NULL; | |
138 | } | |
139 | ||
140 | static bool elf_sec__is_a(GElf_Shdr *shdr, Elf_Data *secstrs, | |
141 | enum map_type type) | |
142 | { | |
143 | switch (type) { | |
144 | case MAP__FUNCTION: | |
145 | return elf_sec__is_text(shdr, secstrs); | |
146 | case MAP__VARIABLE: | |
147 | return elf_sec__is_data(shdr, secstrs); | |
148 | default: | |
149 | return false; | |
150 | } | |
151 | } | |
152 | ||
153 | static size_t elf_addr_to_index(Elf *elf, GElf_Addr addr) | |
154 | { | |
155 | Elf_Scn *sec = NULL; | |
156 | GElf_Shdr shdr; | |
157 | size_t cnt = 1; | |
158 | ||
159 | while ((sec = elf_nextscn(elf, sec)) != NULL) { | |
160 | gelf_getshdr(sec, &shdr); | |
161 | ||
162 | if ((addr >= shdr.sh_addr) && | |
163 | (addr < (shdr.sh_addr + shdr.sh_size))) | |
164 | return cnt; | |
165 | ||
166 | ++cnt; | |
167 | } | |
168 | ||
169 | return -1; | |
170 | } | |
171 | ||
99ca4233 MH |
172 | Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep, |
173 | GElf_Shdr *shp, const char *name, size_t *idx) | |
e5a1845f NK |
174 | { |
175 | Elf_Scn *sec = NULL; | |
176 | size_t cnt = 1; | |
177 | ||
49274654 CS |
178 | /* Elf is corrupted/truncated, avoid calling elf_strptr. */ |
179 | if (!elf_rawdata(elf_getscn(elf, ep->e_shstrndx), NULL)) | |
180 | return NULL; | |
181 | ||
e5a1845f NK |
182 | while ((sec = elf_nextscn(elf, sec)) != NULL) { |
183 | char *str; | |
184 | ||
185 | gelf_getshdr(sec, shp); | |
186 | str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name); | |
155b3a13 | 187 | if (str && !strcmp(name, str)) { |
e5a1845f NK |
188 | if (idx) |
189 | *idx = cnt; | |
155b3a13 | 190 | return sec; |
e5a1845f NK |
191 | } |
192 | ++cnt; | |
193 | } | |
194 | ||
155b3a13 | 195 | return NULL; |
e5a1845f NK |
196 | } |
197 | ||
198 | #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \ | |
199 | for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \ | |
200 | idx < nr_entries; \ | |
201 | ++idx, pos = gelf_getrel(reldata, idx, &pos_mem)) | |
202 | ||
203 | #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \ | |
204 | for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \ | |
205 | idx < nr_entries; \ | |
206 | ++idx, pos = gelf_getrela(reldata, idx, &pos_mem)) | |
207 | ||
208 | /* | |
209 | * We need to check if we have a .dynsym, so that we can handle the | |
210 | * .plt, synthesizing its symbols, that aren't on the symtabs (be it | |
211 | * .dynsym or .symtab). | |
212 | * And always look at the original dso, not at debuginfo packages, that | |
213 | * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS). | |
214 | */ | |
a44f605b | 215 | int dso__synthesize_plt_symbols(struct dso *dso, struct symsrc *ss, struct map *map, |
e5a1845f NK |
216 | symbol_filter_t filter) |
217 | { | |
218 | uint32_t nr_rel_entries, idx; | |
219 | GElf_Sym sym; | |
220 | u64 plt_offset; | |
221 | GElf_Shdr shdr_plt; | |
222 | struct symbol *f; | |
223 | GElf_Shdr shdr_rel_plt, shdr_dynsym; | |
224 | Elf_Data *reldata, *syms, *symstrs; | |
225 | Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym; | |
226 | size_t dynsym_idx; | |
227 | GElf_Ehdr ehdr; | |
228 | char sympltname[1024]; | |
229 | Elf *elf; | |
a44f605b | 230 | int nr = 0, symidx, err = 0; |
e5a1845f | 231 | |
f47b58b7 DA |
232 | if (!ss->dynsym) |
233 | return 0; | |
234 | ||
a44f605b CS |
235 | elf = ss->elf; |
236 | ehdr = ss->ehdr; | |
e5a1845f | 237 | |
a44f605b CS |
238 | scn_dynsym = ss->dynsym; |
239 | shdr_dynsym = ss->dynshdr; | |
240 | dynsym_idx = ss->dynsym_idx; | |
e5a1845f | 241 | |
e5a1845f NK |
242 | if (scn_dynsym == NULL) |
243 | goto out_elf_end; | |
244 | ||
245 | scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt, | |
246 | ".rela.plt", NULL); | |
247 | if (scn_plt_rel == NULL) { | |
248 | scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt, | |
249 | ".rel.plt", NULL); | |
250 | if (scn_plt_rel == NULL) | |
251 | goto out_elf_end; | |
252 | } | |
253 | ||
254 | err = -1; | |
255 | ||
256 | if (shdr_rel_plt.sh_link != dynsym_idx) | |
257 | goto out_elf_end; | |
258 | ||
259 | if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL) | |
260 | goto out_elf_end; | |
261 | ||
262 | /* | |
263 | * Fetch the relocation section to find the idxes to the GOT | |
264 | * and the symbols in the .dynsym they refer to. | |
265 | */ | |
266 | reldata = elf_getdata(scn_plt_rel, NULL); | |
267 | if (reldata == NULL) | |
268 | goto out_elf_end; | |
269 | ||
270 | syms = elf_getdata(scn_dynsym, NULL); | |
271 | if (syms == NULL) | |
272 | goto out_elf_end; | |
273 | ||
274 | scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link); | |
275 | if (scn_symstrs == NULL) | |
276 | goto out_elf_end; | |
277 | ||
278 | symstrs = elf_getdata(scn_symstrs, NULL); | |
279 | if (symstrs == NULL) | |
280 | goto out_elf_end; | |
281 | ||
52f9ddba CS |
282 | if (symstrs->d_size == 0) |
283 | goto out_elf_end; | |
284 | ||
e5a1845f NK |
285 | nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize; |
286 | plt_offset = shdr_plt.sh_offset; | |
287 | ||
288 | if (shdr_rel_plt.sh_type == SHT_RELA) { | |
289 | GElf_Rela pos_mem, *pos; | |
290 | ||
291 | elf_section__for_each_rela(reldata, pos, pos_mem, idx, | |
292 | nr_rel_entries) { | |
293 | symidx = GELF_R_SYM(pos->r_info); | |
294 | plt_offset += shdr_plt.sh_entsize; | |
295 | gelf_getsym(syms, symidx, &sym); | |
296 | snprintf(sympltname, sizeof(sympltname), | |
297 | "%s@plt", elf_sym__name(&sym, symstrs)); | |
298 | ||
299 | f = symbol__new(plt_offset, shdr_plt.sh_entsize, | |
300 | STB_GLOBAL, sympltname); | |
301 | if (!f) | |
302 | goto out_elf_end; | |
303 | ||
304 | if (filter && filter(map, f)) | |
305 | symbol__delete(f); | |
306 | else { | |
307 | symbols__insert(&dso->symbols[map->type], f); | |
308 | ++nr; | |
309 | } | |
310 | } | |
311 | } else if (shdr_rel_plt.sh_type == SHT_REL) { | |
312 | GElf_Rel pos_mem, *pos; | |
313 | elf_section__for_each_rel(reldata, pos, pos_mem, idx, | |
314 | nr_rel_entries) { | |
315 | symidx = GELF_R_SYM(pos->r_info); | |
316 | plt_offset += shdr_plt.sh_entsize; | |
317 | gelf_getsym(syms, symidx, &sym); | |
318 | snprintf(sympltname, sizeof(sympltname), | |
319 | "%s@plt", elf_sym__name(&sym, symstrs)); | |
320 | ||
321 | f = symbol__new(plt_offset, shdr_plt.sh_entsize, | |
322 | STB_GLOBAL, sympltname); | |
323 | if (!f) | |
324 | goto out_elf_end; | |
325 | ||
326 | if (filter && filter(map, f)) | |
327 | symbol__delete(f); | |
328 | else { | |
329 | symbols__insert(&dso->symbols[map->type], f); | |
330 | ++nr; | |
331 | } | |
332 | } | |
333 | } | |
334 | ||
335 | err = 0; | |
336 | out_elf_end: | |
e5a1845f NK |
337 | if (err == 0) |
338 | return nr; | |
e5a1845f NK |
339 | pr_debug("%s: problems reading %s PLT info.\n", |
340 | __func__, dso->long_name); | |
341 | return 0; | |
342 | } | |
343 | ||
344 | /* | |
345 | * Align offset to 4 bytes as needed for note name and descriptor data. | |
346 | */ | |
347 | #define NOTE_ALIGN(n) (((n) + 3) & -4U) | |
348 | ||
349 | static int elf_read_build_id(Elf *elf, void *bf, size_t size) | |
350 | { | |
351 | int err = -1; | |
352 | GElf_Ehdr ehdr; | |
353 | GElf_Shdr shdr; | |
354 | Elf_Data *data; | |
355 | Elf_Scn *sec; | |
356 | Elf_Kind ek; | |
357 | void *ptr; | |
358 | ||
359 | if (size < BUILD_ID_SIZE) | |
360 | goto out; | |
361 | ||
362 | ek = elf_kind(elf); | |
363 | if (ek != ELF_K_ELF) | |
364 | goto out; | |
365 | ||
366 | if (gelf_getehdr(elf, &ehdr) == NULL) { | |
367 | pr_err("%s: cannot get elf header.\n", __func__); | |
368 | goto out; | |
369 | } | |
370 | ||
371 | /* | |
372 | * Check following sections for notes: | |
373 | * '.note.gnu.build-id' | |
374 | * '.notes' | |
375 | * '.note' (VDSO specific) | |
376 | */ | |
377 | do { | |
378 | sec = elf_section_by_name(elf, &ehdr, &shdr, | |
379 | ".note.gnu.build-id", NULL); | |
380 | if (sec) | |
381 | break; | |
382 | ||
383 | sec = elf_section_by_name(elf, &ehdr, &shdr, | |
384 | ".notes", NULL); | |
385 | if (sec) | |
386 | break; | |
387 | ||
388 | sec = elf_section_by_name(elf, &ehdr, &shdr, | |
389 | ".note", NULL); | |
390 | if (sec) | |
391 | break; | |
392 | ||
393 | return err; | |
394 | ||
395 | } while (0); | |
396 | ||
397 | data = elf_getdata(sec, NULL); | |
398 | if (data == NULL) | |
399 | goto out; | |
400 | ||
401 | ptr = data->d_buf; | |
402 | while (ptr < (data->d_buf + data->d_size)) { | |
403 | GElf_Nhdr *nhdr = ptr; | |
404 | size_t namesz = NOTE_ALIGN(nhdr->n_namesz), | |
405 | descsz = NOTE_ALIGN(nhdr->n_descsz); | |
406 | const char *name; | |
407 | ||
408 | ptr += sizeof(*nhdr); | |
409 | name = ptr; | |
410 | ptr += namesz; | |
411 | if (nhdr->n_type == NT_GNU_BUILD_ID && | |
412 | nhdr->n_namesz == sizeof("GNU")) { | |
413 | if (memcmp(name, "GNU", sizeof("GNU")) == 0) { | |
414 | size_t sz = min(size, descsz); | |
415 | memcpy(bf, ptr, sz); | |
416 | memset(bf + sz, 0, size - sz); | |
417 | err = descsz; | |
418 | break; | |
419 | } | |
420 | } | |
421 | ptr += descsz; | |
422 | } | |
423 | ||
424 | out: | |
425 | return err; | |
426 | } | |
427 | ||
428 | int filename__read_build_id(const char *filename, void *bf, size_t size) | |
429 | { | |
430 | int fd, err = -1; | |
431 | Elf *elf; | |
432 | ||
433 | if (size < BUILD_ID_SIZE) | |
434 | goto out; | |
435 | ||
436 | fd = open(filename, O_RDONLY); | |
437 | if (fd < 0) | |
438 | goto out; | |
439 | ||
440 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
441 | if (elf == NULL) { | |
442 | pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename); | |
443 | goto out_close; | |
444 | } | |
445 | ||
446 | err = elf_read_build_id(elf, bf, size); | |
447 | ||
448 | elf_end(elf); | |
449 | out_close: | |
450 | close(fd); | |
451 | out: | |
452 | return err; | |
453 | } | |
454 | ||
455 | int sysfs__read_build_id(const char *filename, void *build_id, size_t size) | |
456 | { | |
457 | int fd, err = -1; | |
458 | ||
459 | if (size < BUILD_ID_SIZE) | |
460 | goto out; | |
461 | ||
462 | fd = open(filename, O_RDONLY); | |
463 | if (fd < 0) | |
464 | goto out; | |
465 | ||
466 | while (1) { | |
467 | char bf[BUFSIZ]; | |
468 | GElf_Nhdr nhdr; | |
469 | size_t namesz, descsz; | |
470 | ||
471 | if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr)) | |
472 | break; | |
473 | ||
474 | namesz = NOTE_ALIGN(nhdr.n_namesz); | |
475 | descsz = NOTE_ALIGN(nhdr.n_descsz); | |
476 | if (nhdr.n_type == NT_GNU_BUILD_ID && | |
477 | nhdr.n_namesz == sizeof("GNU")) { | |
478 | if (read(fd, bf, namesz) != (ssize_t)namesz) | |
479 | break; | |
480 | if (memcmp(bf, "GNU", sizeof("GNU")) == 0) { | |
481 | size_t sz = min(descsz, size); | |
482 | if (read(fd, build_id, sz) == (ssize_t)sz) { | |
483 | memset(build_id + sz, 0, size - sz); | |
484 | err = 0; | |
485 | break; | |
486 | } | |
487 | } else if (read(fd, bf, descsz) != (ssize_t)descsz) | |
488 | break; | |
489 | } else { | |
490 | int n = namesz + descsz; | |
491 | if (read(fd, bf, n) != n) | |
492 | break; | |
493 | } | |
494 | } | |
495 | close(fd); | |
496 | out: | |
497 | return err; | |
498 | } | |
499 | ||
500 | int filename__read_debuglink(const char *filename, char *debuglink, | |
501 | size_t size) | |
502 | { | |
503 | int fd, err = -1; | |
504 | Elf *elf; | |
505 | GElf_Ehdr ehdr; | |
506 | GElf_Shdr shdr; | |
507 | Elf_Data *data; | |
508 | Elf_Scn *sec; | |
509 | Elf_Kind ek; | |
510 | ||
511 | fd = open(filename, O_RDONLY); | |
512 | if (fd < 0) | |
513 | goto out; | |
514 | ||
515 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
516 | if (elf == NULL) { | |
517 | pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename); | |
518 | goto out_close; | |
519 | } | |
520 | ||
521 | ek = elf_kind(elf); | |
522 | if (ek != ELF_K_ELF) | |
784f3390 | 523 | goto out_elf_end; |
e5a1845f NK |
524 | |
525 | if (gelf_getehdr(elf, &ehdr) == NULL) { | |
526 | pr_err("%s: cannot get elf header.\n", __func__); | |
784f3390 | 527 | goto out_elf_end; |
e5a1845f NK |
528 | } |
529 | ||
530 | sec = elf_section_by_name(elf, &ehdr, &shdr, | |
531 | ".gnu_debuglink", NULL); | |
532 | if (sec == NULL) | |
784f3390 | 533 | goto out_elf_end; |
e5a1845f NK |
534 | |
535 | data = elf_getdata(sec, NULL); | |
536 | if (data == NULL) | |
784f3390 | 537 | goto out_elf_end; |
e5a1845f NK |
538 | |
539 | /* the start of this section is a zero-terminated string */ | |
540 | strncpy(debuglink, data->d_buf, size); | |
541 | ||
0d3dc5e8 SE |
542 | err = 0; |
543 | ||
784f3390 | 544 | out_elf_end: |
e5a1845f | 545 | elf_end(elf); |
e5a1845f NK |
546 | out_close: |
547 | close(fd); | |
548 | out: | |
549 | return err; | |
550 | } | |
551 | ||
552 | static int dso__swap_init(struct dso *dso, unsigned char eidata) | |
553 | { | |
554 | static unsigned int const endian = 1; | |
555 | ||
556 | dso->needs_swap = DSO_SWAP__NO; | |
557 | ||
558 | switch (eidata) { | |
559 | case ELFDATA2LSB: | |
560 | /* We are big endian, DSO is little endian. */ | |
561 | if (*(unsigned char const *)&endian != 1) | |
562 | dso->needs_swap = DSO_SWAP__YES; | |
563 | break; | |
564 | ||
565 | case ELFDATA2MSB: | |
566 | /* We are little endian, DSO is big endian. */ | |
567 | if (*(unsigned char const *)&endian != 0) | |
568 | dso->needs_swap = DSO_SWAP__YES; | |
569 | break; | |
570 | ||
571 | default: | |
572 | pr_err("unrecognized DSO data encoding %d\n", eidata); | |
573 | return -EINVAL; | |
574 | } | |
575 | ||
576 | return 0; | |
577 | } | |
578 | ||
c00c48fc NK |
579 | static int decompress_kmodule(struct dso *dso, const char *name, |
580 | enum dso_binary_type type) | |
581 | { | |
914f85c4 | 582 | int fd = -1; |
c00c48fc | 583 | char tmpbuf[] = "/tmp/perf-kmod-XXXXXX"; |
914f85c4 | 584 | struct kmod_path m; |
c00c48fc | 585 | |
0b064f43 NK |
586 | if (type != DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP && |
587 | type != DSO_BINARY_TYPE__GUEST_KMODULE_COMP && | |
588 | type != DSO_BINARY_TYPE__BUILD_ID_CACHE) | |
c00c48fc NK |
589 | return -1; |
590 | ||
914f85c4 JO |
591 | if (type == DSO_BINARY_TYPE__BUILD_ID_CACHE) |
592 | name = dso->long_name; | |
593 | ||
594 | if (kmod_path__parse_ext(&m, name) || !m.comp) | |
595 | return -1; | |
c00c48fc NK |
596 | |
597 | fd = mkstemp(tmpbuf); | |
18425f13 ACM |
598 | if (fd < 0) { |
599 | dso->load_errno = errno; | |
914f85c4 | 600 | goto out; |
18425f13 | 601 | } |
c00c48fc | 602 | |
914f85c4 | 603 | if (!decompress_to_file(m.ext, name, fd)) { |
18425f13 | 604 | dso->load_errno = DSO_LOAD_ERRNO__DECOMPRESSION_FAILURE; |
c00c48fc NK |
605 | close(fd); |
606 | fd = -1; | |
607 | } | |
608 | ||
609 | unlink(tmpbuf); | |
610 | ||
914f85c4 JO |
611 | out: |
612 | free(m.ext); | |
c00c48fc NK |
613 | return fd; |
614 | } | |
615 | ||
3aafe5ae CS |
616 | bool symsrc__possibly_runtime(struct symsrc *ss) |
617 | { | |
618 | return ss->dynsym || ss->opdsec; | |
619 | } | |
620 | ||
d26cd12b CS |
621 | bool symsrc__has_symtab(struct symsrc *ss) |
622 | { | |
623 | return ss->symtab != NULL; | |
624 | } | |
b68e2f91 CS |
625 | |
626 | void symsrc__destroy(struct symsrc *ss) | |
627 | { | |
74cf249d | 628 | zfree(&ss->name); |
b68e2f91 CS |
629 | elf_end(ss->elf); |
630 | close(ss->fd); | |
631 | } | |
632 | ||
d2332098 NR |
633 | bool __weak elf__needs_adjust_symbols(GElf_Ehdr ehdr) |
634 | { | |
635 | return ehdr.e_type == ET_EXEC || ehdr.e_type == ET_REL; | |
636 | } | |
637 | ||
b68e2f91 CS |
638 | int symsrc__init(struct symsrc *ss, struct dso *dso, const char *name, |
639 | enum dso_binary_type type) | |
e5a1845f | 640 | { |
e5a1845f | 641 | int err = -1; |
e5a1845f | 642 | GElf_Ehdr ehdr; |
e5a1845f | 643 | Elf *elf; |
b68e2f91 CS |
644 | int fd; |
645 | ||
18425f13 | 646 | if (dso__needs_decompress(dso)) { |
c00c48fc | 647 | fd = decompress_kmodule(dso, name, type); |
18425f13 ACM |
648 | if (fd < 0) |
649 | return -1; | |
650 | } else { | |
c00c48fc | 651 | fd = open(name, O_RDONLY); |
18425f13 ACM |
652 | if (fd < 0) { |
653 | dso->load_errno = errno; | |
654 | return -1; | |
655 | } | |
656 | } | |
e5a1845f NK |
657 | |
658 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
659 | if (elf == NULL) { | |
660 | pr_debug("%s: cannot read %s ELF file.\n", __func__, name); | |
18425f13 | 661 | dso->load_errno = DSO_LOAD_ERRNO__INVALID_ELF; |
e5a1845f NK |
662 | goto out_close; |
663 | } | |
664 | ||
665 | if (gelf_getehdr(elf, &ehdr) == NULL) { | |
18425f13 | 666 | dso->load_errno = DSO_LOAD_ERRNO__INVALID_ELF; |
e5a1845f NK |
667 | pr_debug("%s: cannot get elf header.\n", __func__); |
668 | goto out_elf_end; | |
669 | } | |
670 | ||
18425f13 ACM |
671 | if (dso__swap_init(dso, ehdr.e_ident[EI_DATA])) { |
672 | dso->load_errno = DSO_LOAD_ERRNO__INTERNAL_ERROR; | |
e5a1845f | 673 | goto out_elf_end; |
18425f13 | 674 | } |
e5a1845f NK |
675 | |
676 | /* Always reject images with a mismatched build-id: */ | |
677 | if (dso->has_build_id) { | |
678 | u8 build_id[BUILD_ID_SIZE]; | |
679 | ||
18425f13 ACM |
680 | if (elf_read_build_id(elf, build_id, BUILD_ID_SIZE) < 0) { |
681 | dso->load_errno = DSO_LOAD_ERRNO__CANNOT_READ_BUILDID; | |
e5a1845f | 682 | goto out_elf_end; |
18425f13 | 683 | } |
e5a1845f | 684 | |
18425f13 | 685 | if (!dso__build_id_equal(dso, build_id)) { |
468f3d29 | 686 | pr_debug("%s: build id mismatch for %s.\n", __func__, name); |
18425f13 | 687 | dso->load_errno = DSO_LOAD_ERRNO__MISMATCHING_BUILDID; |
e5a1845f | 688 | goto out_elf_end; |
18425f13 | 689 | } |
e5a1845f NK |
690 | } |
691 | ||
c6d8f2a4 AH |
692 | ss->is_64_bit = (gelf_getclass(elf) == ELFCLASS64); |
693 | ||
b68e2f91 CS |
694 | ss->symtab = elf_section_by_name(elf, &ehdr, &ss->symshdr, ".symtab", |
695 | NULL); | |
696 | if (ss->symshdr.sh_type != SHT_SYMTAB) | |
697 | ss->symtab = NULL; | |
698 | ||
699 | ss->dynsym_idx = 0; | |
700 | ss->dynsym = elf_section_by_name(elf, &ehdr, &ss->dynshdr, ".dynsym", | |
701 | &ss->dynsym_idx); | |
702 | if (ss->dynshdr.sh_type != SHT_DYNSYM) | |
703 | ss->dynsym = NULL; | |
704 | ||
705 | ss->opdidx = 0; | |
706 | ss->opdsec = elf_section_by_name(elf, &ehdr, &ss->opdshdr, ".opd", | |
707 | &ss->opdidx); | |
708 | if (ss->opdshdr.sh_type != SHT_PROGBITS) | |
709 | ss->opdsec = NULL; | |
710 | ||
711 | if (dso->kernel == DSO_TYPE_USER) { | |
712 | GElf_Shdr shdr; | |
713 | ss->adjust_symbols = (ehdr.e_type == ET_EXEC || | |
0131c4ec | 714 | ehdr.e_type == ET_REL || |
51682dc7 | 715 | dso__is_vdso(dso) || |
b68e2f91 CS |
716 | elf_section_by_name(elf, &ehdr, &shdr, |
717 | ".gnu.prelink_undo", | |
718 | NULL) != NULL); | |
719 | } else { | |
d2332098 | 720 | ss->adjust_symbols = elf__needs_adjust_symbols(ehdr); |
b68e2f91 CS |
721 | } |
722 | ||
723 | ss->name = strdup(name); | |
18425f13 ACM |
724 | if (!ss->name) { |
725 | dso->load_errno = errno; | |
b68e2f91 | 726 | goto out_elf_end; |
18425f13 | 727 | } |
b68e2f91 CS |
728 | |
729 | ss->elf = elf; | |
730 | ss->fd = fd; | |
731 | ss->ehdr = ehdr; | |
732 | ss->type = type; | |
733 | ||
734 | return 0; | |
735 | ||
736 | out_elf_end: | |
737 | elf_end(elf); | |
738 | out_close: | |
739 | close(fd); | |
740 | return err; | |
741 | } | |
742 | ||
39b12f78 AH |
743 | /** |
744 | * ref_reloc_sym_not_found - has kernel relocation symbol been found. | |
745 | * @kmap: kernel maps and relocation reference symbol | |
746 | * | |
747 | * This function returns %true if we are dealing with the kernel maps and the | |
748 | * relocation reference symbol has not yet been found. Otherwise %false is | |
749 | * returned. | |
750 | */ | |
751 | static bool ref_reloc_sym_not_found(struct kmap *kmap) | |
752 | { | |
753 | return kmap && kmap->ref_reloc_sym && kmap->ref_reloc_sym->name && | |
754 | !kmap->ref_reloc_sym->unrelocated_addr; | |
755 | } | |
756 | ||
757 | /** | |
758 | * ref_reloc - kernel relocation offset. | |
759 | * @kmap: kernel maps and relocation reference symbol | |
760 | * | |
761 | * This function returns the offset of kernel addresses as determined by using | |
762 | * the relocation reference symbol i.e. if the kernel has not been relocated | |
763 | * then the return value is zero. | |
764 | */ | |
765 | static u64 ref_reloc(struct kmap *kmap) | |
766 | { | |
767 | if (kmap && kmap->ref_reloc_sym && | |
768 | kmap->ref_reloc_sym->unrelocated_addr) | |
769 | return kmap->ref_reloc_sym->addr - | |
770 | kmap->ref_reloc_sym->unrelocated_addr; | |
771 | return 0; | |
772 | } | |
773 | ||
763122ad AK |
774 | static bool want_demangle(bool is_kernel_sym) |
775 | { | |
776 | return is_kernel_sym ? symbol_conf.demangle_kernel : symbol_conf.demangle; | |
777 | } | |
778 | ||
c50fc0a4 AM |
779 | void __weak arch__elf_sym_adjust(GElf_Sym *sym __maybe_unused) { } |
780 | ||
261360b6 CS |
781 | int dso__load_sym(struct dso *dso, struct map *map, |
782 | struct symsrc *syms_ss, struct symsrc *runtime_ss, | |
d26cd12b | 783 | symbol_filter_t filter, int kmodule) |
b68e2f91 CS |
784 | { |
785 | struct kmap *kmap = dso->kernel ? map__kmap(map) : NULL; | |
ba92732e | 786 | struct map_groups *kmaps = kmap ? map__kmaps(map) : NULL; |
b68e2f91 CS |
787 | struct map *curr_map = map; |
788 | struct dso *curr_dso = dso; | |
789 | Elf_Data *symstrs, *secstrs; | |
790 | uint32_t nr_syms; | |
791 | int err = -1; | |
792 | uint32_t idx; | |
793 | GElf_Ehdr ehdr; | |
261360b6 | 794 | GElf_Shdr shdr; |
b68e2f91 CS |
795 | Elf_Data *syms, *opddata = NULL; |
796 | GElf_Sym sym; | |
261360b6 | 797 | Elf_Scn *sec, *sec_strndx; |
b68e2f91 CS |
798 | Elf *elf; |
799 | int nr = 0; | |
39b12f78 | 800 | bool remap_kernel = false, adjust_kernel_syms = false; |
b68e2f91 | 801 | |
ba92732e WN |
802 | if (kmap && !kmaps) |
803 | return -1; | |
804 | ||
261360b6 | 805 | dso->symtab_type = syms_ss->type; |
c6d8f2a4 | 806 | dso->is_64_bit = syms_ss->is_64_bit; |
0131c4ec AH |
807 | dso->rel = syms_ss->ehdr.e_type == ET_REL; |
808 | ||
809 | /* | |
810 | * Modules may already have symbols from kallsyms, but those symbols | |
811 | * have the wrong values for the dso maps, so remove them. | |
812 | */ | |
813 | if (kmodule && syms_ss->symtab) | |
814 | symbols__delete(&dso->symbols[map->type]); | |
005f9294 | 815 | |
261360b6 | 816 | if (!syms_ss->symtab) { |
d0b0d040 AB |
817 | /* |
818 | * If the vmlinux is stripped, fail so we will fall back | |
819 | * to using kallsyms. The vmlinux runtime symbols aren't | |
820 | * of much use. | |
821 | */ | |
822 | if (dso->kernel) | |
823 | goto out_elf_end; | |
824 | ||
261360b6 CS |
825 | syms_ss->symtab = syms_ss->dynsym; |
826 | syms_ss->symshdr = syms_ss->dynshdr; | |
d26cd12b CS |
827 | } |
828 | ||
261360b6 CS |
829 | elf = syms_ss->elf; |
830 | ehdr = syms_ss->ehdr; | |
831 | sec = syms_ss->symtab; | |
832 | shdr = syms_ss->symshdr; | |
b68e2f91 | 833 | |
261360b6 CS |
834 | if (runtime_ss->opdsec) |
835 | opddata = elf_rawdata(runtime_ss->opdsec, NULL); | |
e5a1845f NK |
836 | |
837 | syms = elf_getdata(sec, NULL); | |
838 | if (syms == NULL) | |
839 | goto out_elf_end; | |
840 | ||
841 | sec = elf_getscn(elf, shdr.sh_link); | |
842 | if (sec == NULL) | |
843 | goto out_elf_end; | |
844 | ||
845 | symstrs = elf_getdata(sec, NULL); | |
846 | if (symstrs == NULL) | |
847 | goto out_elf_end; | |
848 | ||
f247fb81 | 849 | sec_strndx = elf_getscn(runtime_ss->elf, runtime_ss->ehdr.e_shstrndx); |
e5a1845f NK |
850 | if (sec_strndx == NULL) |
851 | goto out_elf_end; | |
852 | ||
853 | secstrs = elf_getdata(sec_strndx, NULL); | |
854 | if (secstrs == NULL) | |
855 | goto out_elf_end; | |
856 | ||
857 | nr_syms = shdr.sh_size / shdr.sh_entsize; | |
858 | ||
859 | memset(&sym, 0, sizeof(sym)); | |
39b12f78 AH |
860 | |
861 | /* | |
862 | * The kernel relocation symbol is needed in advance in order to adjust | |
863 | * kernel maps correctly. | |
864 | */ | |
865 | if (ref_reloc_sym_not_found(kmap)) { | |
866 | elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) { | |
867 | const char *elf_name = elf_sym__name(&sym, symstrs); | |
868 | ||
869 | if (strcmp(elf_name, kmap->ref_reloc_sym->name)) | |
870 | continue; | |
871 | kmap->ref_reloc_sym->unrelocated_addr = sym.st_value; | |
9176753d AH |
872 | map->reloc = kmap->ref_reloc_sym->addr - |
873 | kmap->ref_reloc_sym->unrelocated_addr; | |
39b12f78 AH |
874 | break; |
875 | } | |
876 | } | |
877 | ||
f0ee3b46 AH |
878 | /* |
879 | * Handle any relocation of vdso necessary because older kernels | |
880 | * attempted to prelink vdso to its virtual address. | |
881 | */ | |
882 | if (dso__is_vdso(dso)) { | |
883 | GElf_Shdr tshdr; | |
884 | ||
885 | if (elf_section_by_name(elf, &ehdr, &tshdr, ".text", NULL)) | |
886 | map->reloc = map->start - tshdr.sh_addr + tshdr.sh_offset; | |
887 | } | |
888 | ||
39b12f78 AH |
889 | dso->adjust_symbols = runtime_ss->adjust_symbols || ref_reloc(kmap); |
890 | /* | |
891 | * Initial kernel and module mappings do not map to the dso. For | |
892 | * function mappings, flag the fixups. | |
893 | */ | |
894 | if (map->type == MAP__FUNCTION && (dso->kernel || kmodule)) { | |
895 | remap_kernel = true; | |
896 | adjust_kernel_syms = dso->adjust_symbols; | |
897 | } | |
e5a1845f NK |
898 | elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) { |
899 | struct symbol *f; | |
900 | const char *elf_name = elf_sym__name(&sym, symstrs); | |
901 | char *demangled = NULL; | |
902 | int is_label = elf_sym__is_label(&sym); | |
903 | const char *section_name; | |
261360b6 | 904 | bool used_opd = false; |
e5a1845f | 905 | |
e5a1845f NK |
906 | if (!is_label && !elf_sym__is_a(&sym, map->type)) |
907 | continue; | |
908 | ||
909 | /* Reject ARM ELF "mapping symbols": these aren't unique and | |
910 | * don't identify functions, so will confuse the profile | |
911 | * output: */ | |
4886f2ca VK |
912 | if (ehdr.e_machine == EM_ARM || ehdr.e_machine == EM_AARCH64) { |
913 | if (elf_name[0] == '$' && strchr("adtx", elf_name[1]) | |
914 | && (elf_name[2] == '\0' || elf_name[2] == '.')) | |
e5a1845f NK |
915 | continue; |
916 | } | |
917 | ||
261360b6 CS |
918 | if (runtime_ss->opdsec && sym.st_shndx == runtime_ss->opdidx) { |
919 | u32 offset = sym.st_value - syms_ss->opdshdr.sh_addr; | |
e5a1845f NK |
920 | u64 *opd = opddata->d_buf + offset; |
921 | sym.st_value = DSO__SWAP(dso, u64, *opd); | |
261360b6 CS |
922 | sym.st_shndx = elf_addr_to_index(runtime_ss->elf, |
923 | sym.st_value); | |
924 | used_opd = true; | |
e5a1845f | 925 | } |
3843b05d NK |
926 | /* |
927 | * When loading symbols in a data mapping, ABS symbols (which | |
928 | * has a value of SHN_ABS in its st_shndx) failed at | |
929 | * elf_getscn(). And it marks the loading as a failure so | |
930 | * already loaded symbols cannot be fixed up. | |
931 | * | |
932 | * I'm not sure what should be done. Just ignore them for now. | |
933 | * - Namhyung Kim | |
934 | */ | |
935 | if (sym.st_shndx == SHN_ABS) | |
936 | continue; | |
e5a1845f | 937 | |
261360b6 | 938 | sec = elf_getscn(runtime_ss->elf, sym.st_shndx); |
e5a1845f NK |
939 | if (!sec) |
940 | goto out_elf_end; | |
941 | ||
942 | gelf_getshdr(sec, &shdr); | |
943 | ||
944 | if (is_label && !elf_sec__is_a(&shdr, secstrs, map->type)) | |
945 | continue; | |
946 | ||
947 | section_name = elf_sec__name(&shdr, secstrs); | |
948 | ||
949 | /* On ARM, symbols for thumb functions have 1 added to | |
950 | * the symbol address as a flag - remove it */ | |
951 | if ((ehdr.e_machine == EM_ARM) && | |
952 | (map->type == MAP__FUNCTION) && | |
953 | (sym.st_value & 1)) | |
954 | --sym.st_value; | |
955 | ||
c50fc0a4 AM |
956 | arch__elf_sym_adjust(&sym); |
957 | ||
39b12f78 | 958 | if (dso->kernel || kmodule) { |
e5a1845f NK |
959 | char dso_name[PATH_MAX]; |
960 | ||
39b12f78 AH |
961 | /* Adjust symbol to map to file offset */ |
962 | if (adjust_kernel_syms) | |
963 | sym.st_value -= shdr.sh_addr - shdr.sh_offset; | |
964 | ||
e5a1845f NK |
965 | if (strcmp(section_name, |
966 | (curr_dso->short_name + | |
967 | dso->short_name_len)) == 0) | |
968 | goto new_symbol; | |
969 | ||
970 | if (strcmp(section_name, ".text") == 0) { | |
39b12f78 AH |
971 | /* |
972 | * The initial kernel mapping is based on | |
973 | * kallsyms and identity maps. Overwrite it to | |
974 | * map to the kernel dso. | |
975 | */ | |
976 | if (remap_kernel && dso->kernel) { | |
977 | remap_kernel = false; | |
978 | map->start = shdr.sh_addr + | |
979 | ref_reloc(kmap); | |
980 | map->end = map->start + shdr.sh_size; | |
981 | map->pgoff = shdr.sh_offset; | |
982 | map->map_ip = map__map_ip; | |
983 | map->unmap_ip = map__unmap_ip; | |
984 | /* Ensure maps are correctly ordered */ | |
ba92732e | 985 | if (kmaps) { |
84c2cafa | 986 | map__get(map); |
ba92732e WN |
987 | map_groups__remove(kmaps, map); |
988 | map_groups__insert(kmaps, map); | |
84c2cafa | 989 | map__put(map); |
ba92732e | 990 | } |
39b12f78 AH |
991 | } |
992 | ||
0131c4ec AH |
993 | /* |
994 | * The initial module mapping is based on | |
995 | * /proc/modules mapped to offset zero. | |
996 | * Overwrite it to map to the module dso. | |
997 | */ | |
998 | if (remap_kernel && kmodule) { | |
999 | remap_kernel = false; | |
1000 | map->pgoff = shdr.sh_offset; | |
1001 | } | |
1002 | ||
e5a1845f NK |
1003 | curr_map = map; |
1004 | curr_dso = dso; | |
1005 | goto new_symbol; | |
1006 | } | |
1007 | ||
0131c4ec AH |
1008 | if (!kmap) |
1009 | goto new_symbol; | |
1010 | ||
e5a1845f NK |
1011 | snprintf(dso_name, sizeof(dso_name), |
1012 | "%s%s", dso->short_name, section_name); | |
1013 | ||
ba92732e | 1014 | curr_map = map_groups__find_by_name(kmaps, map->type, dso_name); |
e5a1845f NK |
1015 | if (curr_map == NULL) { |
1016 | u64 start = sym.st_value; | |
1017 | ||
1018 | if (kmodule) | |
1019 | start += map->start + shdr.sh_offset; | |
1020 | ||
1021 | curr_dso = dso__new(dso_name); | |
1022 | if (curr_dso == NULL) | |
1023 | goto out_elf_end; | |
1024 | curr_dso->kernel = dso->kernel; | |
1025 | curr_dso->long_name = dso->long_name; | |
1026 | curr_dso->long_name_len = dso->long_name_len; | |
1027 | curr_map = map__new2(start, curr_dso, | |
1028 | map->type); | |
1029 | if (curr_map == NULL) { | |
d3a7c489 | 1030 | dso__put(curr_dso); |
e5a1845f NK |
1031 | goto out_elf_end; |
1032 | } | |
39b12f78 AH |
1033 | if (adjust_kernel_syms) { |
1034 | curr_map->start = shdr.sh_addr + | |
1035 | ref_reloc(kmap); | |
1036 | curr_map->end = curr_map->start + | |
1037 | shdr.sh_size; | |
1038 | curr_map->pgoff = shdr.sh_offset; | |
1039 | } else { | |
1040 | curr_map->map_ip = identity__map_ip; | |
1041 | curr_map->unmap_ip = identity__map_ip; | |
1042 | } | |
e5a1845f | 1043 | curr_dso->symtab_type = dso->symtab_type; |
ba92732e | 1044 | map_groups__insert(kmaps, curr_map); |
3d39ac53 | 1045 | dsos__add(&map->groups->machine->dsos, curr_dso); |
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); | |
328ccdac NK |
1073 | if (demangled != NULL) |
1074 | elf_name = demangled; | |
1075 | } | |
e5a1845f NK |
1076 | f = symbol__new(sym.st_value, sym.st_size, |
1077 | GELF_ST_BIND(sym.st_info), elf_name); | |
1078 | free(demangled); | |
1079 | if (!f) | |
1080 | goto out_elf_end; | |
1081 | ||
1082 | if (filter && filter(curr_map, f)) | |
1083 | symbol__delete(f); | |
1084 | else { | |
1085 | symbols__insert(&curr_dso->symbols[curr_map->type], f); | |
1086 | nr++; | |
1087 | } | |
1088 | } | |
1089 | ||
1090 | /* | |
1091 | * For misannotated, zeroed, ASM function sizes. | |
1092 | */ | |
1093 | if (nr > 0) { | |
680d926a NK |
1094 | if (!symbol_conf.allow_aliases) |
1095 | symbols__fixup_duplicate(&dso->symbols[map->type]); | |
e5a1845f NK |
1096 | symbols__fixup_end(&dso->symbols[map->type]); |
1097 | if (kmap) { | |
1098 | /* | |
1099 | * We need to fixup this here too because we create new | |
1100 | * maps here, for things like vsyscall sections. | |
1101 | */ | |
ba92732e | 1102 | __map_groups__fixup_end(kmaps, map->type); |
e5a1845f NK |
1103 | } |
1104 | } | |
1105 | err = nr; | |
1106 | out_elf_end: | |
e5a1845f NK |
1107 | return err; |
1108 | } | |
1109 | ||
8e0cf965 AH |
1110 | static int elf_read_maps(Elf *elf, bool exe, mapfn_t mapfn, void *data) |
1111 | { | |
1112 | GElf_Phdr phdr; | |
1113 | size_t i, phdrnum; | |
1114 | int err; | |
1115 | u64 sz; | |
1116 | ||
1117 | if (elf_getphdrnum(elf, &phdrnum)) | |
1118 | return -1; | |
1119 | ||
1120 | for (i = 0; i < phdrnum; i++) { | |
1121 | if (gelf_getphdr(elf, i, &phdr) == NULL) | |
1122 | return -1; | |
1123 | if (phdr.p_type != PT_LOAD) | |
1124 | continue; | |
1125 | if (exe) { | |
1126 | if (!(phdr.p_flags & PF_X)) | |
1127 | continue; | |
1128 | } else { | |
1129 | if (!(phdr.p_flags & PF_R)) | |
1130 | continue; | |
1131 | } | |
1132 | sz = min(phdr.p_memsz, phdr.p_filesz); | |
1133 | if (!sz) | |
1134 | continue; | |
1135 | err = mapfn(phdr.p_vaddr, sz, phdr.p_offset, data); | |
1136 | if (err) | |
1137 | return err; | |
1138 | } | |
1139 | return 0; | |
1140 | } | |
1141 | ||
1142 | int file__read_maps(int fd, bool exe, mapfn_t mapfn, void *data, | |
1143 | bool *is_64_bit) | |
1144 | { | |
1145 | int err; | |
1146 | Elf *elf; | |
1147 | ||
1148 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
1149 | if (elf == NULL) | |
1150 | return -1; | |
1151 | ||
1152 | if (is_64_bit) | |
1153 | *is_64_bit = (gelf_getclass(elf) == ELFCLASS64); | |
1154 | ||
1155 | err = elf_read_maps(elf, exe, mapfn, data); | |
1156 | ||
1157 | elf_end(elf); | |
1158 | return err; | |
1159 | } | |
1160 | ||
2b5b8bb2 AH |
1161 | enum dso_type dso__type_fd(int fd) |
1162 | { | |
1163 | enum dso_type dso_type = DSO__TYPE_UNKNOWN; | |
1164 | GElf_Ehdr ehdr; | |
1165 | Elf_Kind ek; | |
1166 | Elf *elf; | |
1167 | ||
1168 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
1169 | if (elf == NULL) | |
1170 | goto out; | |
1171 | ||
1172 | ek = elf_kind(elf); | |
1173 | if (ek != ELF_K_ELF) | |
1174 | goto out_end; | |
1175 | ||
1176 | if (gelf_getclass(elf) == ELFCLASS64) { | |
1177 | dso_type = DSO__TYPE_64BIT; | |
1178 | goto out_end; | |
1179 | } | |
1180 | ||
1181 | if (gelf_getehdr(elf, &ehdr) == NULL) | |
1182 | goto out_end; | |
1183 | ||
1184 | if (ehdr.e_machine == EM_X86_64) | |
1185 | dso_type = DSO__TYPE_X32BIT; | |
1186 | else | |
1187 | dso_type = DSO__TYPE_32BIT; | |
1188 | out_end: | |
1189 | elf_end(elf); | |
1190 | out: | |
1191 | return dso_type; | |
1192 | } | |
1193 | ||
afba19d9 AH |
1194 | static int copy_bytes(int from, off_t from_offs, int to, off_t to_offs, u64 len) |
1195 | { | |
1196 | ssize_t r; | |
1197 | size_t n; | |
1198 | int err = -1; | |
1199 | char *buf = malloc(page_size); | |
1200 | ||
1201 | if (buf == NULL) | |
1202 | return -1; | |
1203 | ||
1204 | if (lseek(to, to_offs, SEEK_SET) != to_offs) | |
1205 | goto out; | |
1206 | ||
1207 | if (lseek(from, from_offs, SEEK_SET) != from_offs) | |
1208 | goto out; | |
1209 | ||
1210 | while (len) { | |
1211 | n = page_size; | |
1212 | if (len < n) | |
1213 | n = len; | |
1214 | /* Use read because mmap won't work on proc files */ | |
1215 | r = read(from, buf, n); | |
1216 | if (r < 0) | |
1217 | goto out; | |
1218 | if (!r) | |
1219 | break; | |
1220 | n = r; | |
1221 | r = write(to, buf, n); | |
1222 | if (r < 0) | |
1223 | goto out; | |
1224 | if ((size_t)r != n) | |
1225 | goto out; | |
1226 | len -= n; | |
1227 | } | |
1228 | ||
1229 | err = 0; | |
1230 | out: | |
1231 | free(buf); | |
1232 | return err; | |
1233 | } | |
1234 | ||
1235 | struct kcore { | |
1236 | int fd; | |
1237 | int elfclass; | |
1238 | Elf *elf; | |
1239 | GElf_Ehdr ehdr; | |
1240 | }; | |
1241 | ||
1242 | static int kcore__open(struct kcore *kcore, const char *filename) | |
1243 | { | |
1244 | GElf_Ehdr *ehdr; | |
1245 | ||
1246 | kcore->fd = open(filename, O_RDONLY); | |
1247 | if (kcore->fd == -1) | |
1248 | return -1; | |
1249 | ||
1250 | kcore->elf = elf_begin(kcore->fd, ELF_C_READ, NULL); | |
1251 | if (!kcore->elf) | |
1252 | goto out_close; | |
1253 | ||
1254 | kcore->elfclass = gelf_getclass(kcore->elf); | |
1255 | if (kcore->elfclass == ELFCLASSNONE) | |
1256 | goto out_end; | |
1257 | ||
1258 | ehdr = gelf_getehdr(kcore->elf, &kcore->ehdr); | |
1259 | if (!ehdr) | |
1260 | goto out_end; | |
1261 | ||
1262 | return 0; | |
1263 | ||
1264 | out_end: | |
1265 | elf_end(kcore->elf); | |
1266 | out_close: | |
1267 | close(kcore->fd); | |
1268 | return -1; | |
1269 | } | |
1270 | ||
1271 | static int kcore__init(struct kcore *kcore, char *filename, int elfclass, | |
1272 | bool temp) | |
1273 | { | |
afba19d9 AH |
1274 | kcore->elfclass = elfclass; |
1275 | ||
1276 | if (temp) | |
1277 | kcore->fd = mkstemp(filename); | |
1278 | else | |
1279 | kcore->fd = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0400); | |
1280 | if (kcore->fd == -1) | |
1281 | return -1; | |
1282 | ||
1283 | kcore->elf = elf_begin(kcore->fd, ELF_C_WRITE, NULL); | |
1284 | if (!kcore->elf) | |
1285 | goto out_close; | |
1286 | ||
1287 | if (!gelf_newehdr(kcore->elf, elfclass)) | |
1288 | goto out_end; | |
1289 | ||
b5cabbcb | 1290 | memset(&kcore->ehdr, 0, sizeof(GElf_Ehdr)); |
afba19d9 AH |
1291 | |
1292 | return 0; | |
1293 | ||
1294 | out_end: | |
1295 | elf_end(kcore->elf); | |
1296 | out_close: | |
1297 | close(kcore->fd); | |
1298 | unlink(filename); | |
1299 | return -1; | |
1300 | } | |
1301 | ||
1302 | static void kcore__close(struct kcore *kcore) | |
1303 | { | |
1304 | elf_end(kcore->elf); | |
1305 | close(kcore->fd); | |
1306 | } | |
1307 | ||
1308 | static int kcore__copy_hdr(struct kcore *from, struct kcore *to, size_t count) | |
1309 | { | |
1310 | GElf_Ehdr *ehdr = &to->ehdr; | |
1311 | GElf_Ehdr *kehdr = &from->ehdr; | |
1312 | ||
1313 | memcpy(ehdr->e_ident, kehdr->e_ident, EI_NIDENT); | |
1314 | ehdr->e_type = kehdr->e_type; | |
1315 | ehdr->e_machine = kehdr->e_machine; | |
1316 | ehdr->e_version = kehdr->e_version; | |
1317 | ehdr->e_entry = 0; | |
1318 | ehdr->e_shoff = 0; | |
1319 | ehdr->e_flags = kehdr->e_flags; | |
1320 | ehdr->e_phnum = count; | |
1321 | ehdr->e_shentsize = 0; | |
1322 | ehdr->e_shnum = 0; | |
1323 | ehdr->e_shstrndx = 0; | |
1324 | ||
1325 | if (from->elfclass == ELFCLASS32) { | |
1326 | ehdr->e_phoff = sizeof(Elf32_Ehdr); | |
1327 | ehdr->e_ehsize = sizeof(Elf32_Ehdr); | |
1328 | ehdr->e_phentsize = sizeof(Elf32_Phdr); | |
1329 | } else { | |
1330 | ehdr->e_phoff = sizeof(Elf64_Ehdr); | |
1331 | ehdr->e_ehsize = sizeof(Elf64_Ehdr); | |
1332 | ehdr->e_phentsize = sizeof(Elf64_Phdr); | |
1333 | } | |
1334 | ||
1335 | if (!gelf_update_ehdr(to->elf, ehdr)) | |
1336 | return -1; | |
1337 | ||
1338 | if (!gelf_newphdr(to->elf, count)) | |
1339 | return -1; | |
1340 | ||
1341 | return 0; | |
1342 | } | |
1343 | ||
1344 | static int kcore__add_phdr(struct kcore *kcore, int idx, off_t offset, | |
1345 | u64 addr, u64 len) | |
1346 | { | |
b5cabbcb AH |
1347 | GElf_Phdr phdr = { |
1348 | .p_type = PT_LOAD, | |
1349 | .p_flags = PF_R | PF_W | PF_X, | |
1350 | .p_offset = offset, | |
1351 | .p_vaddr = addr, | |
1352 | .p_paddr = 0, | |
1353 | .p_filesz = len, | |
1354 | .p_memsz = len, | |
1355 | .p_align = page_size, | |
1356 | }; | |
1357 | ||
1358 | if (!gelf_update_phdr(kcore->elf, idx, &phdr)) | |
afba19d9 AH |
1359 | return -1; |
1360 | ||
1361 | return 0; | |
1362 | } | |
1363 | ||
1364 | static off_t kcore__write(struct kcore *kcore) | |
1365 | { | |
1366 | return elf_update(kcore->elf, ELF_C_WRITE); | |
1367 | } | |
1368 | ||
fc1b691d AH |
1369 | struct phdr_data { |
1370 | off_t offset; | |
1371 | u64 addr; | |
1372 | u64 len; | |
1373 | }; | |
1374 | ||
1375 | struct kcore_copy_info { | |
1376 | u64 stext; | |
1377 | u64 etext; | |
1378 | u64 first_symbol; | |
1379 | u64 last_symbol; | |
1380 | u64 first_module; | |
1381 | u64 last_module_symbol; | |
1382 | struct phdr_data kernel_map; | |
1383 | struct phdr_data modules_map; | |
1384 | }; | |
1385 | ||
1386 | static int kcore_copy__process_kallsyms(void *arg, const char *name, char type, | |
1387 | u64 start) | |
1388 | { | |
1389 | struct kcore_copy_info *kci = arg; | |
1390 | ||
1391 | if (!symbol_type__is_a(type, MAP__FUNCTION)) | |
1392 | return 0; | |
1393 | ||
1394 | if (strchr(name, '[')) { | |
1395 | if (start > kci->last_module_symbol) | |
1396 | kci->last_module_symbol = start; | |
1397 | return 0; | |
1398 | } | |
1399 | ||
1400 | if (!kci->first_symbol || start < kci->first_symbol) | |
1401 | kci->first_symbol = start; | |
1402 | ||
1403 | if (!kci->last_symbol || start > kci->last_symbol) | |
1404 | kci->last_symbol = start; | |
1405 | ||
1406 | if (!strcmp(name, "_stext")) { | |
1407 | kci->stext = start; | |
1408 | return 0; | |
1409 | } | |
1410 | ||
1411 | if (!strcmp(name, "_etext")) { | |
1412 | kci->etext = start; | |
1413 | return 0; | |
1414 | } | |
1415 | ||
1416 | return 0; | |
1417 | } | |
1418 | ||
1419 | static int kcore_copy__parse_kallsyms(struct kcore_copy_info *kci, | |
1420 | const char *dir) | |
1421 | { | |
1422 | char kallsyms_filename[PATH_MAX]; | |
1423 | ||
1424 | scnprintf(kallsyms_filename, PATH_MAX, "%s/kallsyms", dir); | |
1425 | ||
1426 | if (symbol__restricted_filename(kallsyms_filename, "/proc/kallsyms")) | |
1427 | return -1; | |
1428 | ||
1429 | if (kallsyms__parse(kallsyms_filename, kci, | |
1430 | kcore_copy__process_kallsyms) < 0) | |
1431 | return -1; | |
1432 | ||
1433 | return 0; | |
1434 | } | |
1435 | ||
1436 | static int kcore_copy__process_modules(void *arg, | |
1437 | const char *name __maybe_unused, | |
1438 | u64 start) | |
1439 | { | |
1440 | struct kcore_copy_info *kci = arg; | |
1441 | ||
1442 | if (!kci->first_module || start < kci->first_module) | |
1443 | kci->first_module = start; | |
1444 | ||
1445 | return 0; | |
1446 | } | |
1447 | ||
1448 | static int kcore_copy__parse_modules(struct kcore_copy_info *kci, | |
1449 | const char *dir) | |
1450 | { | |
1451 | char modules_filename[PATH_MAX]; | |
1452 | ||
1453 | scnprintf(modules_filename, PATH_MAX, "%s/modules", dir); | |
1454 | ||
1455 | if (symbol__restricted_filename(modules_filename, "/proc/modules")) | |
1456 | return -1; | |
1457 | ||
1458 | if (modules__parse(modules_filename, kci, | |
1459 | kcore_copy__process_modules) < 0) | |
1460 | return -1; | |
1461 | ||
1462 | return 0; | |
1463 | } | |
1464 | ||
1465 | static void kcore_copy__map(struct phdr_data *p, u64 start, u64 end, u64 pgoff, | |
1466 | u64 s, u64 e) | |
1467 | { | |
1468 | if (p->addr || s < start || s >= end) | |
1469 | return; | |
1470 | ||
1471 | p->addr = s; | |
1472 | p->offset = (s - start) + pgoff; | |
1473 | p->len = e < end ? e - s : end - s; | |
1474 | } | |
1475 | ||
1476 | static int kcore_copy__read_map(u64 start, u64 len, u64 pgoff, void *data) | |
1477 | { | |
1478 | struct kcore_copy_info *kci = data; | |
1479 | u64 end = start + len; | |
1480 | ||
1481 | kcore_copy__map(&kci->kernel_map, start, end, pgoff, kci->stext, | |
1482 | kci->etext); | |
1483 | ||
1484 | kcore_copy__map(&kci->modules_map, start, end, pgoff, kci->first_module, | |
1485 | kci->last_module_symbol); | |
1486 | ||
1487 | return 0; | |
1488 | } | |
1489 | ||
1490 | static int kcore_copy__read_maps(struct kcore_copy_info *kci, Elf *elf) | |
1491 | { | |
1492 | if (elf_read_maps(elf, true, kcore_copy__read_map, kci) < 0) | |
1493 | return -1; | |
1494 | ||
1495 | return 0; | |
1496 | } | |
1497 | ||
1498 | static int kcore_copy__calc_maps(struct kcore_copy_info *kci, const char *dir, | |
1499 | Elf *elf) | |
1500 | { | |
1501 | if (kcore_copy__parse_kallsyms(kci, dir)) | |
1502 | return -1; | |
1503 | ||
1504 | if (kcore_copy__parse_modules(kci, dir)) | |
1505 | return -1; | |
1506 | ||
1507 | if (kci->stext) | |
1508 | kci->stext = round_down(kci->stext, page_size); | |
1509 | else | |
1510 | kci->stext = round_down(kci->first_symbol, page_size); | |
1511 | ||
1512 | if (kci->etext) { | |
1513 | kci->etext = round_up(kci->etext, page_size); | |
1514 | } else if (kci->last_symbol) { | |
1515 | kci->etext = round_up(kci->last_symbol, page_size); | |
1516 | kci->etext += page_size; | |
1517 | } | |
1518 | ||
1519 | kci->first_module = round_down(kci->first_module, page_size); | |
1520 | ||
1521 | if (kci->last_module_symbol) { | |
1522 | kci->last_module_symbol = round_up(kci->last_module_symbol, | |
1523 | page_size); | |
1524 | kci->last_module_symbol += page_size; | |
1525 | } | |
1526 | ||
1527 | if (!kci->stext || !kci->etext) | |
1528 | return -1; | |
1529 | ||
1530 | if (kci->first_module && !kci->last_module_symbol) | |
1531 | return -1; | |
1532 | ||
1533 | return kcore_copy__read_maps(kci, elf); | |
1534 | } | |
1535 | ||
1536 | static int kcore_copy__copy_file(const char *from_dir, const char *to_dir, | |
1537 | const char *name) | |
1538 | { | |
1539 | char from_filename[PATH_MAX]; | |
1540 | char to_filename[PATH_MAX]; | |
1541 | ||
1542 | scnprintf(from_filename, PATH_MAX, "%s/%s", from_dir, name); | |
1543 | scnprintf(to_filename, PATH_MAX, "%s/%s", to_dir, name); | |
1544 | ||
1545 | return copyfile_mode(from_filename, to_filename, 0400); | |
1546 | } | |
1547 | ||
1548 | static int kcore_copy__unlink(const char *dir, const char *name) | |
1549 | { | |
1550 | char filename[PATH_MAX]; | |
1551 | ||
1552 | scnprintf(filename, PATH_MAX, "%s/%s", dir, name); | |
1553 | ||
1554 | return unlink(filename); | |
1555 | } | |
1556 | ||
1557 | static int kcore_copy__compare_fds(int from, int to) | |
1558 | { | |
1559 | char *buf_from; | |
1560 | char *buf_to; | |
1561 | ssize_t ret; | |
1562 | size_t len; | |
1563 | int err = -1; | |
1564 | ||
1565 | buf_from = malloc(page_size); | |
1566 | buf_to = malloc(page_size); | |
1567 | if (!buf_from || !buf_to) | |
1568 | goto out; | |
1569 | ||
1570 | while (1) { | |
1571 | /* Use read because mmap won't work on proc files */ | |
1572 | ret = read(from, buf_from, page_size); | |
1573 | if (ret < 0) | |
1574 | goto out; | |
1575 | ||
1576 | if (!ret) | |
1577 | break; | |
1578 | ||
1579 | len = ret; | |
1580 | ||
1581 | if (readn(to, buf_to, len) != (int)len) | |
1582 | goto out; | |
1583 | ||
1584 | if (memcmp(buf_from, buf_to, len)) | |
1585 | goto out; | |
1586 | } | |
1587 | ||
1588 | err = 0; | |
1589 | out: | |
1590 | free(buf_to); | |
1591 | free(buf_from); | |
1592 | return err; | |
1593 | } | |
1594 | ||
1595 | static int kcore_copy__compare_files(const char *from_filename, | |
1596 | const char *to_filename) | |
1597 | { | |
1598 | int from, to, err = -1; | |
1599 | ||
1600 | from = open(from_filename, O_RDONLY); | |
1601 | if (from < 0) | |
1602 | return -1; | |
1603 | ||
1604 | to = open(to_filename, O_RDONLY); | |
1605 | if (to < 0) | |
1606 | goto out_close_from; | |
1607 | ||
1608 | err = kcore_copy__compare_fds(from, to); | |
1609 | ||
1610 | close(to); | |
1611 | out_close_from: | |
1612 | close(from); | |
1613 | return err; | |
1614 | } | |
1615 | ||
1616 | static int kcore_copy__compare_file(const char *from_dir, const char *to_dir, | |
1617 | const char *name) | |
1618 | { | |
1619 | char from_filename[PATH_MAX]; | |
1620 | char to_filename[PATH_MAX]; | |
1621 | ||
1622 | scnprintf(from_filename, PATH_MAX, "%s/%s", from_dir, name); | |
1623 | scnprintf(to_filename, PATH_MAX, "%s/%s", to_dir, name); | |
1624 | ||
1625 | return kcore_copy__compare_files(from_filename, to_filename); | |
1626 | } | |
1627 | ||
1628 | /** | |
1629 | * kcore_copy - copy kallsyms, modules and kcore from one directory to another. | |
1630 | * @from_dir: from directory | |
1631 | * @to_dir: to directory | |
1632 | * | |
1633 | * This function copies kallsyms, modules and kcore files from one directory to | |
1634 | * another. kallsyms and modules are copied entirely. Only code segments are | |
1635 | * copied from kcore. It is assumed that two segments suffice: one for the | |
1636 | * kernel proper and one for all the modules. The code segments are determined | |
1637 | * from kallsyms and modules files. The kernel map starts at _stext or the | |
1638 | * lowest function symbol, and ends at _etext or the highest function symbol. | |
1639 | * The module map starts at the lowest module address and ends at the highest | |
1640 | * module symbol. Start addresses are rounded down to the nearest page. End | |
1641 | * addresses are rounded up to the nearest page. An extra page is added to the | |
1642 | * highest kernel symbol and highest module symbol to, hopefully, encompass that | |
1643 | * symbol too. Because it contains only code sections, the resulting kcore is | |
1644 | * unusual. One significant peculiarity is that the mapping (start -> pgoff) | |
1645 | * is not the same for the kernel map and the modules map. That happens because | |
1646 | * the data is copied adjacently whereas the original kcore has gaps. Finally, | |
1647 | * kallsyms and modules files are compared with their copies to check that | |
1648 | * modules have not been loaded or unloaded while the copies were taking place. | |
1649 | * | |
1650 | * Return: %0 on success, %-1 on failure. | |
1651 | */ | |
1652 | int kcore_copy(const char *from_dir, const char *to_dir) | |
1653 | { | |
1654 | struct kcore kcore; | |
1655 | struct kcore extract; | |
1656 | size_t count = 2; | |
1657 | int idx = 0, err = -1; | |
1658 | off_t offset = page_size, sz, modules_offset = 0; | |
1659 | struct kcore_copy_info kci = { .stext = 0, }; | |
1660 | char kcore_filename[PATH_MAX]; | |
1661 | char extract_filename[PATH_MAX]; | |
1662 | ||
1663 | if (kcore_copy__copy_file(from_dir, to_dir, "kallsyms")) | |
1664 | return -1; | |
1665 | ||
1666 | if (kcore_copy__copy_file(from_dir, to_dir, "modules")) | |
1667 | goto out_unlink_kallsyms; | |
1668 | ||
1669 | scnprintf(kcore_filename, PATH_MAX, "%s/kcore", from_dir); | |
1670 | scnprintf(extract_filename, PATH_MAX, "%s/kcore", to_dir); | |
1671 | ||
1672 | if (kcore__open(&kcore, kcore_filename)) | |
1673 | goto out_unlink_modules; | |
1674 | ||
1675 | if (kcore_copy__calc_maps(&kci, from_dir, kcore.elf)) | |
1676 | goto out_kcore_close; | |
1677 | ||
1678 | if (kcore__init(&extract, extract_filename, kcore.elfclass, false)) | |
1679 | goto out_kcore_close; | |
1680 | ||
1681 | if (!kci.modules_map.addr) | |
1682 | count -= 1; | |
1683 | ||
1684 | if (kcore__copy_hdr(&kcore, &extract, count)) | |
1685 | goto out_extract_close; | |
1686 | ||
1687 | if (kcore__add_phdr(&extract, idx++, offset, kci.kernel_map.addr, | |
1688 | kci.kernel_map.len)) | |
1689 | goto out_extract_close; | |
1690 | ||
1691 | if (kci.modules_map.addr) { | |
1692 | modules_offset = offset + kci.kernel_map.len; | |
1693 | if (kcore__add_phdr(&extract, idx, modules_offset, | |
1694 | kci.modules_map.addr, kci.modules_map.len)) | |
1695 | goto out_extract_close; | |
1696 | } | |
1697 | ||
1698 | sz = kcore__write(&extract); | |
1699 | if (sz < 0 || sz > offset) | |
1700 | goto out_extract_close; | |
1701 | ||
1702 | if (copy_bytes(kcore.fd, kci.kernel_map.offset, extract.fd, offset, | |
1703 | kci.kernel_map.len)) | |
1704 | goto out_extract_close; | |
1705 | ||
1706 | if (modules_offset && copy_bytes(kcore.fd, kci.modules_map.offset, | |
1707 | extract.fd, modules_offset, | |
1708 | kci.modules_map.len)) | |
1709 | goto out_extract_close; | |
1710 | ||
1711 | if (kcore_copy__compare_file(from_dir, to_dir, "modules")) | |
1712 | goto out_extract_close; | |
1713 | ||
1714 | if (kcore_copy__compare_file(from_dir, to_dir, "kallsyms")) | |
1715 | goto out_extract_close; | |
1716 | ||
1717 | err = 0; | |
1718 | ||
1719 | out_extract_close: | |
1720 | kcore__close(&extract); | |
1721 | if (err) | |
1722 | unlink(extract_filename); | |
1723 | out_kcore_close: | |
1724 | kcore__close(&kcore); | |
1725 | out_unlink_modules: | |
1726 | if (err) | |
1727 | kcore_copy__unlink(to_dir, "modules"); | |
1728 | out_unlink_kallsyms: | |
1729 | if (err) | |
1730 | kcore_copy__unlink(to_dir, "kallsyms"); | |
1731 | ||
1732 | return err; | |
1733 | } | |
1734 | ||
afba19d9 AH |
1735 | int kcore_extract__create(struct kcore_extract *kce) |
1736 | { | |
1737 | struct kcore kcore; | |
1738 | struct kcore extract; | |
1739 | size_t count = 1; | |
1740 | int idx = 0, err = -1; | |
1741 | off_t offset = page_size, sz; | |
1742 | ||
1743 | if (kcore__open(&kcore, kce->kcore_filename)) | |
1744 | return -1; | |
1745 | ||
1746 | strcpy(kce->extract_filename, PERF_KCORE_EXTRACT); | |
1747 | if (kcore__init(&extract, kce->extract_filename, kcore.elfclass, true)) | |
1748 | goto out_kcore_close; | |
1749 | ||
1750 | if (kcore__copy_hdr(&kcore, &extract, count)) | |
1751 | goto out_extract_close; | |
1752 | ||
1753 | if (kcore__add_phdr(&extract, idx, offset, kce->addr, kce->len)) | |
1754 | goto out_extract_close; | |
1755 | ||
1756 | sz = kcore__write(&extract); | |
1757 | if (sz < 0 || sz > offset) | |
1758 | goto out_extract_close; | |
1759 | ||
1760 | if (copy_bytes(kcore.fd, kce->offs, extract.fd, offset, kce->len)) | |
1761 | goto out_extract_close; | |
1762 | ||
1763 | err = 0; | |
1764 | ||
1765 | out_extract_close: | |
1766 | kcore__close(&extract); | |
1767 | if (err) | |
1768 | unlink(kce->extract_filename); | |
1769 | out_kcore_close: | |
1770 | kcore__close(&kcore); | |
1771 | ||
1772 | return err; | |
1773 | } | |
1774 | ||
1775 | void kcore_extract__delete(struct kcore_extract *kce) | |
1776 | { | |
1777 | unlink(kce->extract_filename); | |
1778 | } | |
1779 | ||
e5a1845f NK |
1780 | void symbol__elf_init(void) |
1781 | { | |
1782 | elf_version(EV_CURRENT); | |
1783 | } |