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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
e5a1845f NK |
2 | #include <fcntl.h> |
3 | #include <stdio.h> | |
4 | #include <errno.h> | |
5 | #include <string.h> | |
6 | #include <unistd.h> | |
7 | #include <inttypes.h> | |
8 | ||
9 | #include "symbol.h" | |
e9c4bcdd | 10 | #include "demangle-java.h" |
cae15db7 | 11 | #include "demangle-rust.h" |
8fa7d87f | 12 | #include "machine.h" |
922d0e4d | 13 | #include "vdso.h" |
e5a1845f | 14 | #include "debug.h" |
3d689ed6 ACM |
15 | #include "sane_ctype.h" |
16 | #include <symbol/kallsyms.h> | |
e5a1845f | 17 | |
e370a3d5 DA |
18 | #ifndef EM_AARCH64 |
19 | #define EM_AARCH64 183 /* ARM 64 bit */ | |
20 | #endif | |
21 | ||
cc31078c | 22 | typedef Elf64_Nhdr GElf_Nhdr; |
e370a3d5 | 23 | |
aaba4e12 ACM |
24 | #ifdef HAVE_CPLUS_DEMANGLE_SUPPORT |
25 | extern char *cplus_demangle(const char *, int); | |
26 | ||
27 | static inline char *bfd_demangle(void __maybe_unused *v, const char *c, int i) | |
28 | { | |
29 | return cplus_demangle(c, i); | |
30 | } | |
31 | #else | |
32 | #ifdef NO_DEMANGLE | |
33 | static inline char *bfd_demangle(void __maybe_unused *v, | |
34 | const char __maybe_unused *c, | |
35 | int __maybe_unused i) | |
36 | { | |
37 | return NULL; | |
38 | } | |
39 | #else | |
40 | #define PACKAGE 'perf' | |
41 | #include <bfd.h> | |
42 | #endif | |
43 | #endif | |
44 | ||
89fe808a | 45 | #ifndef HAVE_ELF_GETPHDRNUM_SUPPORT |
179f36dd | 46 | static int elf_getphdrnum(Elf *elf, size_t *dst) |
e955d5c4 AH |
47 | { |
48 | GElf_Ehdr gehdr; | |
49 | GElf_Ehdr *ehdr; | |
50 | ||
51 | ehdr = gelf_getehdr(elf, &gehdr); | |
52 | if (!ehdr) | |
53 | return -1; | |
54 | ||
55 | *dst = ehdr->e_phnum; | |
56 | ||
57 | return 0; | |
58 | } | |
59 | #endif | |
60 | ||
2492c465 ACM |
61 | #ifndef HAVE_ELF_GETSHDRSTRNDX_SUPPORT |
62 | static int elf_getshdrstrndx(Elf *elf __maybe_unused, size_t *dst __maybe_unused) | |
63 | { | |
64 | pr_err("%s: update your libelf to > 0.140, this one lacks elf_getshdrstrndx().\n", __func__); | |
65 | return -1; | |
66 | } | |
67 | #endif | |
68 | ||
e5a1845f NK |
69 | #ifndef NT_GNU_BUILD_ID |
70 | #define NT_GNU_BUILD_ID 3 | |
71 | #endif | |
72 | ||
73 | /** | |
74 | * elf_symtab__for_each_symbol - iterate thru all the symbols | |
75 | * | |
76 | * @syms: struct elf_symtab instance to iterate | |
77 | * @idx: uint32_t idx | |
78 | * @sym: GElf_Sym iterator | |
79 | */ | |
80 | #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \ | |
81 | for (idx = 0, gelf_getsym(syms, idx, &sym);\ | |
82 | idx < nr_syms; \ | |
83 | idx++, gelf_getsym(syms, idx, &sym)) | |
84 | ||
85 | static inline uint8_t elf_sym__type(const GElf_Sym *sym) | |
86 | { | |
87 | return GELF_ST_TYPE(sym->st_info); | |
88 | } | |
89 | ||
4e31050f VL |
90 | #ifndef STT_GNU_IFUNC |
91 | #define STT_GNU_IFUNC 10 | |
92 | #endif | |
93 | ||
e5a1845f NK |
94 | static inline int elf_sym__is_function(const GElf_Sym *sym) |
95 | { | |
a2f3b6bf AH |
96 | return (elf_sym__type(sym) == STT_FUNC || |
97 | elf_sym__type(sym) == STT_GNU_IFUNC) && | |
e5a1845f NK |
98 | sym->st_name != 0 && |
99 | sym->st_shndx != SHN_UNDEF; | |
100 | } | |
101 | ||
102 | static inline bool elf_sym__is_object(const GElf_Sym *sym) | |
103 | { | |
104 | return elf_sym__type(sym) == STT_OBJECT && | |
105 | sym->st_name != 0 && | |
106 | sym->st_shndx != SHN_UNDEF; | |
107 | } | |
108 | ||
109 | static inline int elf_sym__is_label(const GElf_Sym *sym) | |
110 | { | |
111 | return elf_sym__type(sym) == STT_NOTYPE && | |
112 | sym->st_name != 0 && | |
113 | sym->st_shndx != SHN_UNDEF && | |
114 | sym->st_shndx != SHN_ABS; | |
115 | } | |
116 | ||
117 | static bool elf_sym__is_a(GElf_Sym *sym, enum map_type type) | |
118 | { | |
119 | switch (type) { | |
120 | case MAP__FUNCTION: | |
121 | return elf_sym__is_function(sym); | |
122 | case MAP__VARIABLE: | |
123 | return elf_sym__is_object(sym); | |
124 | default: | |
125 | return false; | |
126 | } | |
127 | } | |
128 | ||
129 | static inline const char *elf_sym__name(const GElf_Sym *sym, | |
130 | const Elf_Data *symstrs) | |
131 | { | |
132 | return symstrs->d_buf + sym->st_name; | |
133 | } | |
134 | ||
135 | static inline const char *elf_sec__name(const GElf_Shdr *shdr, | |
136 | const Elf_Data *secstrs) | |
137 | { | |
138 | return secstrs->d_buf + shdr->sh_name; | |
139 | } | |
140 | ||
141 | static inline int elf_sec__is_text(const GElf_Shdr *shdr, | |
142 | const Elf_Data *secstrs) | |
143 | { | |
144 | return strstr(elf_sec__name(shdr, secstrs), "text") != NULL; | |
145 | } | |
146 | ||
147 | static inline bool elf_sec__is_data(const GElf_Shdr *shdr, | |
148 | const Elf_Data *secstrs) | |
149 | { | |
150 | return strstr(elf_sec__name(shdr, secstrs), "data") != NULL; | |
151 | } | |
152 | ||
153 | static bool elf_sec__is_a(GElf_Shdr *shdr, Elf_Data *secstrs, | |
154 | enum map_type type) | |
155 | { | |
156 | switch (type) { | |
157 | case MAP__FUNCTION: | |
158 | return elf_sec__is_text(shdr, secstrs); | |
159 | case MAP__VARIABLE: | |
160 | return elf_sec__is_data(shdr, secstrs); | |
161 | default: | |
162 | return false; | |
163 | } | |
164 | } | |
165 | ||
166 | static size_t elf_addr_to_index(Elf *elf, GElf_Addr addr) | |
167 | { | |
168 | Elf_Scn *sec = NULL; | |
169 | GElf_Shdr shdr; | |
170 | size_t cnt = 1; | |
171 | ||
172 | while ((sec = elf_nextscn(elf, sec)) != NULL) { | |
173 | gelf_getshdr(sec, &shdr); | |
174 | ||
175 | if ((addr >= shdr.sh_addr) && | |
176 | (addr < (shdr.sh_addr + shdr.sh_size))) | |
177 | return cnt; | |
178 | ||
179 | ++cnt; | |
180 | } | |
181 | ||
182 | return -1; | |
183 | } | |
184 | ||
99ca4233 MH |
185 | Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep, |
186 | GElf_Shdr *shp, const char *name, size_t *idx) | |
e5a1845f NK |
187 | { |
188 | Elf_Scn *sec = NULL; | |
189 | size_t cnt = 1; | |
190 | ||
49274654 CS |
191 | /* Elf is corrupted/truncated, avoid calling elf_strptr. */ |
192 | if (!elf_rawdata(elf_getscn(elf, ep->e_shstrndx), NULL)) | |
193 | return NULL; | |
194 | ||
e5a1845f NK |
195 | while ((sec = elf_nextscn(elf, sec)) != NULL) { |
196 | char *str; | |
197 | ||
198 | gelf_getshdr(sec, shp); | |
199 | str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name); | |
155b3a13 | 200 | if (str && !strcmp(name, str)) { |
e5a1845f NK |
201 | if (idx) |
202 | *idx = cnt; | |
155b3a13 | 203 | return sec; |
e5a1845f NK |
204 | } |
205 | ++cnt; | |
206 | } | |
207 | ||
155b3a13 | 208 | return NULL; |
e5a1845f NK |
209 | } |
210 | ||
2a8d41b4 MW |
211 | static bool want_demangle(bool is_kernel_sym) |
212 | { | |
213 | return is_kernel_sym ? symbol_conf.demangle_kernel : symbol_conf.demangle; | |
214 | } | |
215 | ||
216 | static char *demangle_sym(struct dso *dso, int kmodule, const char *elf_name) | |
217 | { | |
bb963e16 | 218 | int demangle_flags = verbose > 0 ? (DMGL_PARAMS | DMGL_ANSI) : DMGL_NO_OPTS; |
2a8d41b4 MW |
219 | char *demangled = NULL; |
220 | ||
221 | /* | |
222 | * We need to figure out if the object was created from C++ sources | |
223 | * DWARF DW_compile_unit has this, but we don't always have access | |
224 | * to it... | |
225 | */ | |
226 | if (!want_demangle(dso->kernel || kmodule)) | |
227 | return demangled; | |
228 | ||
229 | demangled = bfd_demangle(NULL, elf_name, demangle_flags); | |
230 | if (demangled == NULL) | |
231 | demangled = java_demangle_sym(elf_name, JAVA_DEMANGLE_NORET); | |
232 | else if (rust_is_mangled(demangled)) | |
233 | /* | |
234 | * Input to Rust demangling is the BFD-demangled | |
235 | * name which it Rust-demangles in place. | |
236 | */ | |
237 | rust_demangle_sym(demangled); | |
238 | ||
239 | return demangled; | |
240 | } | |
241 | ||
e5a1845f NK |
242 | #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \ |
243 | for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \ | |
244 | idx < nr_entries; \ | |
245 | ++idx, pos = gelf_getrel(reldata, idx, &pos_mem)) | |
246 | ||
247 | #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \ | |
248 | for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \ | |
249 | idx < nr_entries; \ | |
250 | ++idx, pos = gelf_getrela(reldata, idx, &pos_mem)) | |
251 | ||
252 | /* | |
253 | * We need to check if we have a .dynsym, so that we can handle the | |
254 | * .plt, synthesizing its symbols, that aren't on the symtabs (be it | |
255 | * .dynsym or .symtab). | |
256 | * And always look at the original dso, not at debuginfo packages, that | |
257 | * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS). | |
258 | */ | |
be39db9f | 259 | int dso__synthesize_plt_symbols(struct dso *dso, struct symsrc *ss, struct map *map) |
e5a1845f NK |
260 | { |
261 | uint32_t nr_rel_entries, idx; | |
262 | GElf_Sym sym; | |
b2f76050 | 263 | u64 plt_offset, plt_header_size, plt_entry_size; |
e5a1845f NK |
264 | GElf_Shdr shdr_plt; |
265 | struct symbol *f; | |
266 | GElf_Shdr shdr_rel_plt, shdr_dynsym; | |
267 | Elf_Data *reldata, *syms, *symstrs; | |
268 | Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym; | |
269 | size_t dynsym_idx; | |
270 | GElf_Ehdr ehdr; | |
271 | char sympltname[1024]; | |
272 | Elf *elf; | |
a44f605b | 273 | int nr = 0, symidx, err = 0; |
e5a1845f | 274 | |
f47b58b7 DA |
275 | if (!ss->dynsym) |
276 | return 0; | |
277 | ||
a44f605b CS |
278 | elf = ss->elf; |
279 | ehdr = ss->ehdr; | |
e5a1845f | 280 | |
a44f605b CS |
281 | scn_dynsym = ss->dynsym; |
282 | shdr_dynsym = ss->dynshdr; | |
283 | dynsym_idx = ss->dynsym_idx; | |
e5a1845f | 284 | |
e5a1845f NK |
285 | if (scn_dynsym == NULL) |
286 | goto out_elf_end; | |
287 | ||
288 | scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt, | |
289 | ".rela.plt", NULL); | |
290 | if (scn_plt_rel == NULL) { | |
291 | scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt, | |
292 | ".rel.plt", NULL); | |
293 | if (scn_plt_rel == NULL) | |
294 | goto out_elf_end; | |
295 | } | |
296 | ||
297 | err = -1; | |
298 | ||
299 | if (shdr_rel_plt.sh_link != dynsym_idx) | |
300 | goto out_elf_end; | |
301 | ||
302 | if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL) | |
303 | goto out_elf_end; | |
304 | ||
305 | /* | |
306 | * Fetch the relocation section to find the idxes to the GOT | |
307 | * and the symbols in the .dynsym they refer to. | |
308 | */ | |
309 | reldata = elf_getdata(scn_plt_rel, NULL); | |
310 | if (reldata == NULL) | |
311 | goto out_elf_end; | |
312 | ||
313 | syms = elf_getdata(scn_dynsym, NULL); | |
314 | if (syms == NULL) | |
315 | goto out_elf_end; | |
316 | ||
317 | scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link); | |
318 | if (scn_symstrs == NULL) | |
319 | goto out_elf_end; | |
320 | ||
321 | symstrs = elf_getdata(scn_symstrs, NULL); | |
322 | if (symstrs == NULL) | |
323 | goto out_elf_end; | |
324 | ||
52f9ddba CS |
325 | if (symstrs->d_size == 0) |
326 | goto out_elf_end; | |
327 | ||
e5a1845f NK |
328 | nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize; |
329 | plt_offset = shdr_plt.sh_offset; | |
b2f76050 LB |
330 | switch (ehdr.e_machine) { |
331 | case EM_ARM: | |
332 | plt_header_size = 20; | |
333 | plt_entry_size = 12; | |
334 | break; | |
335 | ||
336 | case EM_AARCH64: | |
337 | plt_header_size = 32; | |
338 | plt_entry_size = 16; | |
339 | break; | |
340 | ||
341 | default: /* FIXME: s390/alpha/mips/parisc/poperpc/sh/sparc/xtensa need to be checked */ | |
342 | plt_header_size = shdr_plt.sh_entsize; | |
343 | plt_entry_size = shdr_plt.sh_entsize; | |
344 | break; | |
345 | } | |
346 | plt_offset += plt_header_size; | |
e5a1845f NK |
347 | |
348 | if (shdr_rel_plt.sh_type == SHT_RELA) { | |
349 | GElf_Rela pos_mem, *pos; | |
350 | ||
351 | elf_section__for_each_rela(reldata, pos, pos_mem, idx, | |
352 | nr_rel_entries) { | |
2a8d41b4 MW |
353 | const char *elf_name = NULL; |
354 | char *demangled = NULL; | |
e5a1845f | 355 | symidx = GELF_R_SYM(pos->r_info); |
e5a1845f | 356 | gelf_getsym(syms, symidx, &sym); |
2a8d41b4 MW |
357 | |
358 | elf_name = elf_sym__name(&sym, symstrs); | |
359 | demangled = demangle_sym(dso, 0, elf_name); | |
360 | if (demangled != NULL) | |
361 | elf_name = demangled; | |
e5a1845f | 362 | snprintf(sympltname, sizeof(sympltname), |
2a8d41b4 MW |
363 | "%s@plt", elf_name); |
364 | free(demangled); | |
e5a1845f | 365 | |
b2f76050 | 366 | f = symbol__new(plt_offset, plt_entry_size, |
e5a1845f NK |
367 | STB_GLOBAL, sympltname); |
368 | if (!f) | |
369 | goto out_elf_end; | |
370 | ||
b2f76050 | 371 | plt_offset += plt_entry_size; |
be39db9f ACM |
372 | symbols__insert(&dso->symbols[map->type], f); |
373 | ++nr; | |
e5a1845f NK |
374 | } |
375 | } else if (shdr_rel_plt.sh_type == SHT_REL) { | |
376 | GElf_Rel pos_mem, *pos; | |
377 | elf_section__for_each_rel(reldata, pos, pos_mem, idx, | |
378 | nr_rel_entries) { | |
2a8d41b4 MW |
379 | const char *elf_name = NULL; |
380 | char *demangled = NULL; | |
e5a1845f | 381 | symidx = GELF_R_SYM(pos->r_info); |
e5a1845f | 382 | gelf_getsym(syms, symidx, &sym); |
2a8d41b4 MW |
383 | |
384 | elf_name = elf_sym__name(&sym, symstrs); | |
385 | demangled = demangle_sym(dso, 0, elf_name); | |
386 | if (demangled != NULL) | |
387 | elf_name = demangled; | |
e5a1845f | 388 | snprintf(sympltname, sizeof(sympltname), |
2a8d41b4 MW |
389 | "%s@plt", elf_name); |
390 | free(demangled); | |
e5a1845f | 391 | |
b2f76050 | 392 | f = symbol__new(plt_offset, plt_entry_size, |
e5a1845f NK |
393 | STB_GLOBAL, sympltname); |
394 | if (!f) | |
395 | goto out_elf_end; | |
396 | ||
b2f76050 | 397 | plt_offset += plt_entry_size; |
be39db9f ACM |
398 | symbols__insert(&dso->symbols[map->type], f); |
399 | ++nr; | |
e5a1845f NK |
400 | } |
401 | } | |
402 | ||
403 | err = 0; | |
404 | out_elf_end: | |
e5a1845f NK |
405 | if (err == 0) |
406 | return nr; | |
e5a1845f NK |
407 | pr_debug("%s: problems reading %s PLT info.\n", |
408 | __func__, dso->long_name); | |
409 | return 0; | |
410 | } | |
411 | ||
80c345b2 | 412 | char *dso__demangle_sym(struct dso *dso, int kmodule, const char *elf_name) |
a64489c5 JY |
413 | { |
414 | return demangle_sym(dso, kmodule, elf_name); | |
415 | } | |
416 | ||
e5a1845f NK |
417 | /* |
418 | * Align offset to 4 bytes as needed for note name and descriptor data. | |
419 | */ | |
420 | #define NOTE_ALIGN(n) (((n) + 3) & -4U) | |
421 | ||
422 | static int elf_read_build_id(Elf *elf, void *bf, size_t size) | |
423 | { | |
424 | int err = -1; | |
425 | GElf_Ehdr ehdr; | |
426 | GElf_Shdr shdr; | |
427 | Elf_Data *data; | |
428 | Elf_Scn *sec; | |
429 | Elf_Kind ek; | |
430 | void *ptr; | |
431 | ||
432 | if (size < BUILD_ID_SIZE) | |
433 | goto out; | |
434 | ||
435 | ek = elf_kind(elf); | |
436 | if (ek != ELF_K_ELF) | |
437 | goto out; | |
438 | ||
439 | if (gelf_getehdr(elf, &ehdr) == NULL) { | |
440 | pr_err("%s: cannot get elf header.\n", __func__); | |
441 | goto out; | |
442 | } | |
443 | ||
444 | /* | |
445 | * Check following sections for notes: | |
446 | * '.note.gnu.build-id' | |
447 | * '.notes' | |
448 | * '.note' (VDSO specific) | |
449 | */ | |
450 | do { | |
451 | sec = elf_section_by_name(elf, &ehdr, &shdr, | |
452 | ".note.gnu.build-id", NULL); | |
453 | if (sec) | |
454 | break; | |
455 | ||
456 | sec = elf_section_by_name(elf, &ehdr, &shdr, | |
457 | ".notes", NULL); | |
458 | if (sec) | |
459 | break; | |
460 | ||
461 | sec = elf_section_by_name(elf, &ehdr, &shdr, | |
462 | ".note", NULL); | |
463 | if (sec) | |
464 | break; | |
465 | ||
466 | return err; | |
467 | ||
468 | } while (0); | |
469 | ||
470 | data = elf_getdata(sec, NULL); | |
471 | if (data == NULL) | |
472 | goto out; | |
473 | ||
474 | ptr = data->d_buf; | |
475 | while (ptr < (data->d_buf + data->d_size)) { | |
476 | GElf_Nhdr *nhdr = ptr; | |
477 | size_t namesz = NOTE_ALIGN(nhdr->n_namesz), | |
478 | descsz = NOTE_ALIGN(nhdr->n_descsz); | |
479 | const char *name; | |
480 | ||
481 | ptr += sizeof(*nhdr); | |
482 | name = ptr; | |
483 | ptr += namesz; | |
484 | if (nhdr->n_type == NT_GNU_BUILD_ID && | |
485 | nhdr->n_namesz == sizeof("GNU")) { | |
486 | if (memcmp(name, "GNU", sizeof("GNU")) == 0) { | |
487 | size_t sz = min(size, descsz); | |
488 | memcpy(bf, ptr, sz); | |
489 | memset(bf + sz, 0, size - sz); | |
490 | err = descsz; | |
491 | break; | |
492 | } | |
493 | } | |
494 | ptr += descsz; | |
495 | } | |
496 | ||
497 | out: | |
498 | return err; | |
499 | } | |
500 | ||
501 | int filename__read_build_id(const char *filename, void *bf, size_t size) | |
502 | { | |
503 | int fd, err = -1; | |
504 | Elf *elf; | |
505 | ||
506 | if (size < BUILD_ID_SIZE) | |
507 | goto out; | |
508 | ||
509 | fd = open(filename, O_RDONLY); | |
510 | if (fd < 0) | |
511 | goto out; | |
512 | ||
513 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
514 | if (elf == NULL) { | |
515 | pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename); | |
516 | goto out_close; | |
517 | } | |
518 | ||
519 | err = elf_read_build_id(elf, bf, size); | |
520 | ||
521 | elf_end(elf); | |
522 | out_close: | |
523 | close(fd); | |
524 | out: | |
525 | return err; | |
526 | } | |
527 | ||
528 | int sysfs__read_build_id(const char *filename, void *build_id, size_t size) | |
529 | { | |
530 | int fd, err = -1; | |
531 | ||
532 | if (size < BUILD_ID_SIZE) | |
533 | goto out; | |
534 | ||
535 | fd = open(filename, O_RDONLY); | |
536 | if (fd < 0) | |
537 | goto out; | |
538 | ||
539 | while (1) { | |
540 | char bf[BUFSIZ]; | |
541 | GElf_Nhdr nhdr; | |
542 | size_t namesz, descsz; | |
543 | ||
544 | if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr)) | |
545 | break; | |
546 | ||
547 | namesz = NOTE_ALIGN(nhdr.n_namesz); | |
548 | descsz = NOTE_ALIGN(nhdr.n_descsz); | |
549 | if (nhdr.n_type == NT_GNU_BUILD_ID && | |
550 | nhdr.n_namesz == sizeof("GNU")) { | |
551 | if (read(fd, bf, namesz) != (ssize_t)namesz) | |
552 | break; | |
553 | if (memcmp(bf, "GNU", sizeof("GNU")) == 0) { | |
554 | size_t sz = min(descsz, size); | |
555 | if (read(fd, build_id, sz) == (ssize_t)sz) { | |
556 | memset(build_id + sz, 0, size - sz); | |
557 | err = 0; | |
558 | break; | |
559 | } | |
560 | } else if (read(fd, bf, descsz) != (ssize_t)descsz) | |
561 | break; | |
562 | } else { | |
563 | int n = namesz + descsz; | |
7934c98a ACM |
564 | |
565 | if (n > (int)sizeof(bf)) { | |
566 | n = sizeof(bf); | |
567 | pr_debug("%s: truncating reading of build id in sysfs file %s: n_namesz=%u, n_descsz=%u.\n", | |
568 | __func__, filename, nhdr.n_namesz, nhdr.n_descsz); | |
569 | } | |
e5a1845f NK |
570 | if (read(fd, bf, n) != n) |
571 | break; | |
572 | } | |
573 | } | |
574 | close(fd); | |
575 | out: | |
576 | return err; | |
577 | } | |
578 | ||
579 | int filename__read_debuglink(const char *filename, char *debuglink, | |
580 | size_t size) | |
581 | { | |
582 | int fd, err = -1; | |
583 | Elf *elf; | |
584 | GElf_Ehdr ehdr; | |
585 | GElf_Shdr shdr; | |
586 | Elf_Data *data; | |
587 | Elf_Scn *sec; | |
588 | Elf_Kind ek; | |
589 | ||
590 | fd = open(filename, O_RDONLY); | |
591 | if (fd < 0) | |
592 | goto out; | |
593 | ||
594 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
595 | if (elf == NULL) { | |
596 | pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename); | |
597 | goto out_close; | |
598 | } | |
599 | ||
600 | ek = elf_kind(elf); | |
601 | if (ek != ELF_K_ELF) | |
784f3390 | 602 | goto out_elf_end; |
e5a1845f NK |
603 | |
604 | if (gelf_getehdr(elf, &ehdr) == NULL) { | |
605 | pr_err("%s: cannot get elf header.\n", __func__); | |
784f3390 | 606 | goto out_elf_end; |
e5a1845f NK |
607 | } |
608 | ||
609 | sec = elf_section_by_name(elf, &ehdr, &shdr, | |
610 | ".gnu_debuglink", NULL); | |
611 | if (sec == NULL) | |
784f3390 | 612 | goto out_elf_end; |
e5a1845f NK |
613 | |
614 | data = elf_getdata(sec, NULL); | |
615 | if (data == NULL) | |
784f3390 | 616 | goto out_elf_end; |
e5a1845f NK |
617 | |
618 | /* the start of this section is a zero-terminated string */ | |
619 | strncpy(debuglink, data->d_buf, size); | |
620 | ||
0d3dc5e8 SE |
621 | err = 0; |
622 | ||
784f3390 | 623 | out_elf_end: |
e5a1845f | 624 | elf_end(elf); |
e5a1845f NK |
625 | out_close: |
626 | close(fd); | |
627 | out: | |
628 | return err; | |
629 | } | |
630 | ||
631 | static int dso__swap_init(struct dso *dso, unsigned char eidata) | |
632 | { | |
633 | static unsigned int const endian = 1; | |
634 | ||
635 | dso->needs_swap = DSO_SWAP__NO; | |
636 | ||
637 | switch (eidata) { | |
638 | case ELFDATA2LSB: | |
639 | /* We are big endian, DSO is little endian. */ | |
640 | if (*(unsigned char const *)&endian != 1) | |
641 | dso->needs_swap = DSO_SWAP__YES; | |
642 | break; | |
643 | ||
644 | case ELFDATA2MSB: | |
645 | /* We are little endian, DSO is big endian. */ | |
646 | if (*(unsigned char const *)&endian != 0) | |
647 | dso->needs_swap = DSO_SWAP__YES; | |
648 | break; | |
649 | ||
650 | default: | |
651 | pr_err("unrecognized DSO data encoding %d\n", eidata); | |
652 | return -EINVAL; | |
653 | } | |
654 | ||
655 | return 0; | |
656 | } | |
657 | ||
3aafe5ae CS |
658 | bool symsrc__possibly_runtime(struct symsrc *ss) |
659 | { | |
660 | return ss->dynsym || ss->opdsec; | |
661 | } | |
662 | ||
d26cd12b CS |
663 | bool symsrc__has_symtab(struct symsrc *ss) |
664 | { | |
665 | return ss->symtab != NULL; | |
666 | } | |
b68e2f91 CS |
667 | |
668 | void symsrc__destroy(struct symsrc *ss) | |
669 | { | |
74cf249d | 670 | zfree(&ss->name); |
b68e2f91 CS |
671 | elf_end(ss->elf); |
672 | close(ss->fd); | |
673 | } | |
674 | ||
d2332098 NR |
675 | bool __weak elf__needs_adjust_symbols(GElf_Ehdr ehdr) |
676 | { | |
677 | return ehdr.e_type == ET_EXEC || ehdr.e_type == ET_REL; | |
678 | } | |
679 | ||
b68e2f91 CS |
680 | int symsrc__init(struct symsrc *ss, struct dso *dso, const char *name, |
681 | enum dso_binary_type type) | |
e5a1845f | 682 | { |
e5a1845f | 683 | int err = -1; |
e5a1845f | 684 | GElf_Ehdr ehdr; |
e5a1845f | 685 | Elf *elf; |
b68e2f91 CS |
686 | int fd; |
687 | ||
18425f13 | 688 | if (dso__needs_decompress(dso)) { |
42b3fa67 | 689 | fd = dso__decompress_kmodule_fd(dso, name); |
18425f13 ACM |
690 | if (fd < 0) |
691 | return -1; | |
c25ec42f NK |
692 | |
693 | type = dso->symtab_type; | |
18425f13 | 694 | } else { |
c00c48fc | 695 | fd = open(name, O_RDONLY); |
18425f13 ACM |
696 | if (fd < 0) { |
697 | dso->load_errno = errno; | |
698 | return -1; | |
699 | } | |
700 | } | |
e5a1845f NK |
701 | |
702 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
703 | if (elf == NULL) { | |
704 | pr_debug("%s: cannot read %s ELF file.\n", __func__, name); | |
18425f13 | 705 | dso->load_errno = DSO_LOAD_ERRNO__INVALID_ELF; |
e5a1845f NK |
706 | goto out_close; |
707 | } | |
708 | ||
709 | if (gelf_getehdr(elf, &ehdr) == NULL) { | |
18425f13 | 710 | dso->load_errno = DSO_LOAD_ERRNO__INVALID_ELF; |
e5a1845f NK |
711 | pr_debug("%s: cannot get elf header.\n", __func__); |
712 | goto out_elf_end; | |
713 | } | |
714 | ||
18425f13 ACM |
715 | if (dso__swap_init(dso, ehdr.e_ident[EI_DATA])) { |
716 | dso->load_errno = DSO_LOAD_ERRNO__INTERNAL_ERROR; | |
e5a1845f | 717 | goto out_elf_end; |
18425f13 | 718 | } |
e5a1845f NK |
719 | |
720 | /* Always reject images with a mismatched build-id: */ | |
428aff82 | 721 | if (dso->has_build_id && !symbol_conf.ignore_vmlinux_buildid) { |
e5a1845f NK |
722 | u8 build_id[BUILD_ID_SIZE]; |
723 | ||
18425f13 ACM |
724 | if (elf_read_build_id(elf, build_id, BUILD_ID_SIZE) < 0) { |
725 | dso->load_errno = DSO_LOAD_ERRNO__CANNOT_READ_BUILDID; | |
e5a1845f | 726 | goto out_elf_end; |
18425f13 | 727 | } |
e5a1845f | 728 | |
18425f13 | 729 | if (!dso__build_id_equal(dso, build_id)) { |
468f3d29 | 730 | pr_debug("%s: build id mismatch for %s.\n", __func__, name); |
18425f13 | 731 | dso->load_errno = DSO_LOAD_ERRNO__MISMATCHING_BUILDID; |
e5a1845f | 732 | goto out_elf_end; |
18425f13 | 733 | } |
e5a1845f NK |
734 | } |
735 | ||
c6d8f2a4 AH |
736 | ss->is_64_bit = (gelf_getclass(elf) == ELFCLASS64); |
737 | ||
b68e2f91 CS |
738 | ss->symtab = elf_section_by_name(elf, &ehdr, &ss->symshdr, ".symtab", |
739 | NULL); | |
740 | if (ss->symshdr.sh_type != SHT_SYMTAB) | |
741 | ss->symtab = NULL; | |
742 | ||
743 | ss->dynsym_idx = 0; | |
744 | ss->dynsym = elf_section_by_name(elf, &ehdr, &ss->dynshdr, ".dynsym", | |
745 | &ss->dynsym_idx); | |
746 | if (ss->dynshdr.sh_type != SHT_DYNSYM) | |
747 | ss->dynsym = NULL; | |
748 | ||
749 | ss->opdidx = 0; | |
750 | ss->opdsec = elf_section_by_name(elf, &ehdr, &ss->opdshdr, ".opd", | |
751 | &ss->opdidx); | |
752 | if (ss->opdshdr.sh_type != SHT_PROGBITS) | |
753 | ss->opdsec = NULL; | |
754 | ||
99e87f7b WN |
755 | if (dso->kernel == DSO_TYPE_USER) |
756 | ss->adjust_symbols = true; | |
757 | else | |
d2332098 | 758 | ss->adjust_symbols = elf__needs_adjust_symbols(ehdr); |
b68e2f91 CS |
759 | |
760 | ss->name = strdup(name); | |
18425f13 ACM |
761 | if (!ss->name) { |
762 | dso->load_errno = errno; | |
b68e2f91 | 763 | goto out_elf_end; |
18425f13 | 764 | } |
b68e2f91 CS |
765 | |
766 | ss->elf = elf; | |
767 | ss->fd = fd; | |
768 | ss->ehdr = ehdr; | |
769 | ss->type = type; | |
770 | ||
771 | return 0; | |
772 | ||
773 | out_elf_end: | |
774 | elf_end(elf); | |
775 | out_close: | |
776 | close(fd); | |
777 | return err; | |
778 | } | |
779 | ||
39b12f78 AH |
780 | /** |
781 | * ref_reloc_sym_not_found - has kernel relocation symbol been found. | |
782 | * @kmap: kernel maps and relocation reference symbol | |
783 | * | |
784 | * This function returns %true if we are dealing with the kernel maps and the | |
785 | * relocation reference symbol has not yet been found. Otherwise %false is | |
786 | * returned. | |
787 | */ | |
788 | static bool ref_reloc_sym_not_found(struct kmap *kmap) | |
789 | { | |
790 | return kmap && kmap->ref_reloc_sym && kmap->ref_reloc_sym->name && | |
791 | !kmap->ref_reloc_sym->unrelocated_addr; | |
792 | } | |
793 | ||
794 | /** | |
795 | * ref_reloc - kernel relocation offset. | |
796 | * @kmap: kernel maps and relocation reference symbol | |
797 | * | |
798 | * This function returns the offset of kernel addresses as determined by using | |
799 | * the relocation reference symbol i.e. if the kernel has not been relocated | |
800 | * then the return value is zero. | |
801 | */ | |
802 | static u64 ref_reloc(struct kmap *kmap) | |
803 | { | |
804 | if (kmap && kmap->ref_reloc_sym && | |
805 | kmap->ref_reloc_sym->unrelocated_addr) | |
806 | return kmap->ref_reloc_sym->addr - | |
807 | kmap->ref_reloc_sym->unrelocated_addr; | |
808 | return 0; | |
809 | } | |
810 | ||
0b3c2264 NR |
811 | void __weak arch__sym_update(struct symbol *s __maybe_unused, |
812 | GElf_Sym *sym __maybe_unused) { } | |
c50fc0a4 | 813 | |
be39db9f ACM |
814 | int dso__load_sym(struct dso *dso, struct map *map, struct symsrc *syms_ss, |
815 | struct symsrc *runtime_ss, int kmodule) | |
b68e2f91 CS |
816 | { |
817 | struct kmap *kmap = dso->kernel ? map__kmap(map) : NULL; | |
ba92732e | 818 | struct map_groups *kmaps = kmap ? map__kmaps(map) : NULL; |
b68e2f91 CS |
819 | struct map *curr_map = map; |
820 | struct dso *curr_dso = dso; | |
821 | Elf_Data *symstrs, *secstrs; | |
822 | uint32_t nr_syms; | |
823 | int err = -1; | |
824 | uint32_t idx; | |
825 | GElf_Ehdr ehdr; | |
261360b6 | 826 | GElf_Shdr shdr; |
73cdf0c6 | 827 | GElf_Shdr tshdr; |
b68e2f91 CS |
828 | Elf_Data *syms, *opddata = NULL; |
829 | GElf_Sym sym; | |
261360b6 | 830 | Elf_Scn *sec, *sec_strndx; |
b68e2f91 CS |
831 | Elf *elf; |
832 | int nr = 0; | |
39b12f78 | 833 | bool remap_kernel = false, adjust_kernel_syms = false; |
b68e2f91 | 834 | |
ba92732e WN |
835 | if (kmap && !kmaps) |
836 | return -1; | |
837 | ||
261360b6 | 838 | dso->symtab_type = syms_ss->type; |
c6d8f2a4 | 839 | dso->is_64_bit = syms_ss->is_64_bit; |
0131c4ec AH |
840 | dso->rel = syms_ss->ehdr.e_type == ET_REL; |
841 | ||
842 | /* | |
843 | * Modules may already have symbols from kallsyms, but those symbols | |
844 | * have the wrong values for the dso maps, so remove them. | |
845 | */ | |
846 | if (kmodule && syms_ss->symtab) | |
847 | symbols__delete(&dso->symbols[map->type]); | |
005f9294 | 848 | |
261360b6 | 849 | if (!syms_ss->symtab) { |
d0b0d040 AB |
850 | /* |
851 | * If the vmlinux is stripped, fail so we will fall back | |
852 | * to using kallsyms. The vmlinux runtime symbols aren't | |
853 | * of much use. | |
854 | */ | |
855 | if (dso->kernel) | |
856 | goto out_elf_end; | |
857 | ||
261360b6 CS |
858 | syms_ss->symtab = syms_ss->dynsym; |
859 | syms_ss->symshdr = syms_ss->dynshdr; | |
d26cd12b CS |
860 | } |
861 | ||
261360b6 CS |
862 | elf = syms_ss->elf; |
863 | ehdr = syms_ss->ehdr; | |
864 | sec = syms_ss->symtab; | |
865 | shdr = syms_ss->symshdr; | |
b68e2f91 | 866 | |
50de1a0c AB |
867 | if (elf_section_by_name(runtime_ss->elf, &runtime_ss->ehdr, &tshdr, |
868 | ".text", NULL)) | |
73cdf0c6 WN |
869 | dso->text_offset = tshdr.sh_addr - tshdr.sh_offset; |
870 | ||
261360b6 CS |
871 | if (runtime_ss->opdsec) |
872 | opddata = elf_rawdata(runtime_ss->opdsec, NULL); | |
e5a1845f NK |
873 | |
874 | syms = elf_getdata(sec, NULL); | |
875 | if (syms == NULL) | |
876 | goto out_elf_end; | |
877 | ||
878 | sec = elf_getscn(elf, shdr.sh_link); | |
879 | if (sec == NULL) | |
880 | goto out_elf_end; | |
881 | ||
882 | symstrs = elf_getdata(sec, NULL); | |
883 | if (symstrs == NULL) | |
884 | goto out_elf_end; | |
885 | ||
f247fb81 | 886 | sec_strndx = elf_getscn(runtime_ss->elf, runtime_ss->ehdr.e_shstrndx); |
e5a1845f NK |
887 | if (sec_strndx == NULL) |
888 | goto out_elf_end; | |
889 | ||
890 | secstrs = elf_getdata(sec_strndx, NULL); | |
891 | if (secstrs == NULL) | |
892 | goto out_elf_end; | |
893 | ||
894 | nr_syms = shdr.sh_size / shdr.sh_entsize; | |
895 | ||
896 | memset(&sym, 0, sizeof(sym)); | |
39b12f78 AH |
897 | |
898 | /* | |
899 | * The kernel relocation symbol is needed in advance in order to adjust | |
900 | * kernel maps correctly. | |
901 | */ | |
902 | if (ref_reloc_sym_not_found(kmap)) { | |
903 | elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) { | |
904 | const char *elf_name = elf_sym__name(&sym, symstrs); | |
905 | ||
906 | if (strcmp(elf_name, kmap->ref_reloc_sym->name)) | |
907 | continue; | |
908 | kmap->ref_reloc_sym->unrelocated_addr = sym.st_value; | |
9176753d AH |
909 | map->reloc = kmap->ref_reloc_sym->addr - |
910 | kmap->ref_reloc_sym->unrelocated_addr; | |
39b12f78 AH |
911 | break; |
912 | } | |
913 | } | |
914 | ||
f0ee3b46 AH |
915 | /* |
916 | * Handle any relocation of vdso necessary because older kernels | |
917 | * attempted to prelink vdso to its virtual address. | |
918 | */ | |
73cdf0c6 WN |
919 | if (dso__is_vdso(dso)) |
920 | map->reloc = map->start - dso->text_offset; | |
f0ee3b46 | 921 | |
39b12f78 AH |
922 | dso->adjust_symbols = runtime_ss->adjust_symbols || ref_reloc(kmap); |
923 | /* | |
924 | * Initial kernel and module mappings do not map to the dso. For | |
925 | * function mappings, flag the fixups. | |
926 | */ | |
927 | if (map->type == MAP__FUNCTION && (dso->kernel || kmodule)) { | |
928 | remap_kernel = true; | |
929 | adjust_kernel_syms = dso->adjust_symbols; | |
930 | } | |
e5a1845f NK |
931 | elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) { |
932 | struct symbol *f; | |
933 | const char *elf_name = elf_sym__name(&sym, symstrs); | |
934 | char *demangled = NULL; | |
935 | int is_label = elf_sym__is_label(&sym); | |
936 | const char *section_name; | |
261360b6 | 937 | bool used_opd = false; |
e5a1845f | 938 | |
e5a1845f NK |
939 | if (!is_label && !elf_sym__is_a(&sym, map->type)) |
940 | continue; | |
941 | ||
942 | /* Reject ARM ELF "mapping symbols": these aren't unique and | |
943 | * don't identify functions, so will confuse the profile | |
944 | * output: */ | |
4886f2ca VK |
945 | if (ehdr.e_machine == EM_ARM || ehdr.e_machine == EM_AARCH64) { |
946 | if (elf_name[0] == '$' && strchr("adtx", elf_name[1]) | |
947 | && (elf_name[2] == '\0' || elf_name[2] == '.')) | |
e5a1845f NK |
948 | continue; |
949 | } | |
950 | ||
261360b6 CS |
951 | if (runtime_ss->opdsec && sym.st_shndx == runtime_ss->opdidx) { |
952 | u32 offset = sym.st_value - syms_ss->opdshdr.sh_addr; | |
e5a1845f NK |
953 | u64 *opd = opddata->d_buf + offset; |
954 | sym.st_value = DSO__SWAP(dso, u64, *opd); | |
261360b6 CS |
955 | sym.st_shndx = elf_addr_to_index(runtime_ss->elf, |
956 | sym.st_value); | |
957 | used_opd = true; | |
e5a1845f | 958 | } |
3843b05d NK |
959 | /* |
960 | * When loading symbols in a data mapping, ABS symbols (which | |
961 | * has a value of SHN_ABS in its st_shndx) failed at | |
962 | * elf_getscn(). And it marks the loading as a failure so | |
963 | * already loaded symbols cannot be fixed up. | |
964 | * | |
965 | * I'm not sure what should be done. Just ignore them for now. | |
966 | * - Namhyung Kim | |
967 | */ | |
968 | if (sym.st_shndx == SHN_ABS) | |
969 | continue; | |
e5a1845f | 970 | |
261360b6 | 971 | sec = elf_getscn(runtime_ss->elf, sym.st_shndx); |
e5a1845f NK |
972 | if (!sec) |
973 | goto out_elf_end; | |
974 | ||
975 | gelf_getshdr(sec, &shdr); | |
976 | ||
977 | if (is_label && !elf_sec__is_a(&shdr, secstrs, map->type)) | |
978 | continue; | |
979 | ||
980 | section_name = elf_sec__name(&shdr, secstrs); | |
981 | ||
982 | /* On ARM, symbols for thumb functions have 1 added to | |
983 | * the symbol address as a flag - remove it */ | |
984 | if ((ehdr.e_machine == EM_ARM) && | |
985 | (map->type == MAP__FUNCTION) && | |
986 | (sym.st_value & 1)) | |
987 | --sym.st_value; | |
988 | ||
39b12f78 | 989 | if (dso->kernel || kmodule) { |
e5a1845f NK |
990 | char dso_name[PATH_MAX]; |
991 | ||
39b12f78 AH |
992 | /* Adjust symbol to map to file offset */ |
993 | if (adjust_kernel_syms) | |
b28503a3 | 994 | sym.st_value -= shdr.sh_addr - shdr.sh_offset; |
39b12f78 | 995 | |
e5a1845f NK |
996 | if (strcmp(section_name, |
997 | (curr_dso->short_name + | |
998 | dso->short_name_len)) == 0) | |
999 | goto new_symbol; | |
1000 | ||
1001 | if (strcmp(section_name, ".text") == 0) { | |
39b12f78 AH |
1002 | /* |
1003 | * The initial kernel mapping is based on | |
1004 | * kallsyms and identity maps. Overwrite it to | |
1005 | * map to the kernel dso. | |
1006 | */ | |
1007 | if (remap_kernel && dso->kernel) { | |
1008 | remap_kernel = false; | |
1009 | map->start = shdr.sh_addr + | |
1010 | ref_reloc(kmap); | |
1011 | map->end = map->start + shdr.sh_size; | |
1012 | map->pgoff = shdr.sh_offset; | |
1013 | map->map_ip = map__map_ip; | |
1014 | map->unmap_ip = map__unmap_ip; | |
1015 | /* Ensure maps are correctly ordered */ | |
ba92732e | 1016 | if (kmaps) { |
84c2cafa | 1017 | map__get(map); |
ba92732e WN |
1018 | map_groups__remove(kmaps, map); |
1019 | map_groups__insert(kmaps, map); | |
84c2cafa | 1020 | map__put(map); |
ba92732e | 1021 | } |
39b12f78 AH |
1022 | } |
1023 | ||
0131c4ec AH |
1024 | /* |
1025 | * The initial module mapping is based on | |
1026 | * /proc/modules mapped to offset zero. | |
1027 | * Overwrite it to map to the module dso. | |
1028 | */ | |
1029 | if (remap_kernel && kmodule) { | |
1030 | remap_kernel = false; | |
1031 | map->pgoff = shdr.sh_offset; | |
1032 | } | |
1033 | ||
e5a1845f NK |
1034 | curr_map = map; |
1035 | curr_dso = dso; | |
1036 | goto new_symbol; | |
1037 | } | |
1038 | ||
0131c4ec AH |
1039 | if (!kmap) |
1040 | goto new_symbol; | |
1041 | ||
e5a1845f NK |
1042 | snprintf(dso_name, sizeof(dso_name), |
1043 | "%s%s", dso->short_name, section_name); | |
1044 | ||
ba92732e | 1045 | curr_map = map_groups__find_by_name(kmaps, map->type, dso_name); |
e5a1845f NK |
1046 | if (curr_map == NULL) { |
1047 | u64 start = sym.st_value; | |
1048 | ||
1049 | if (kmodule) | |
1050 | start += map->start + shdr.sh_offset; | |
1051 | ||
1052 | curr_dso = dso__new(dso_name); | |
1053 | if (curr_dso == NULL) | |
1054 | goto out_elf_end; | |
1055 | curr_dso->kernel = dso->kernel; | |
1056 | curr_dso->long_name = dso->long_name; | |
1057 | curr_dso->long_name_len = dso->long_name_len; | |
1058 | curr_map = map__new2(start, curr_dso, | |
1059 | map->type); | |
e7a7865c | 1060 | dso__put(curr_dso); |
e5a1845f | 1061 | if (curr_map == NULL) { |
e5a1845f NK |
1062 | goto out_elf_end; |
1063 | } | |
39b12f78 AH |
1064 | if (adjust_kernel_syms) { |
1065 | curr_map->start = shdr.sh_addr + | |
1066 | ref_reloc(kmap); | |
1067 | curr_map->end = curr_map->start + | |
1068 | shdr.sh_size; | |
1069 | curr_map->pgoff = shdr.sh_offset; | |
1070 | } else { | |
1071 | curr_map->map_ip = identity__map_ip; | |
1072 | curr_map->unmap_ip = identity__map_ip; | |
1073 | } | |
e5a1845f | 1074 | curr_dso->symtab_type = dso->symtab_type; |
ba92732e | 1075 | map_groups__insert(kmaps, curr_map); |
e7a7865c MH |
1076 | /* |
1077 | * Add it before we drop the referece to curr_map, | |
1078 | * i.e. while we still are sure to have a reference | |
1079 | * to this DSO via curr_map->dso. | |
1080 | */ | |
1081 | dsos__add(&map->groups->machine->dsos, curr_dso); | |
8d5c340d MH |
1082 | /* kmaps already got it */ |
1083 | map__put(curr_map); | |
e5a1845f NK |
1084 | dso__set_loaded(curr_dso, map->type); |
1085 | } else | |
1086 | curr_dso = curr_map->dso; | |
1087 | ||
1088 | goto new_symbol; | |
1089 | } | |
1090 | ||
261360b6 CS |
1091 | if ((used_opd && runtime_ss->adjust_symbols) |
1092 | || (!used_opd && syms_ss->adjust_symbols)) { | |
e5a1845f NK |
1093 | pr_debug4("%s: adjusting symbol: st_value: %#" PRIx64 " " |
1094 | "sh_addr: %#" PRIx64 " sh_offset: %#" PRIx64 "\n", __func__, | |
1095 | (u64)sym.st_value, (u64)shdr.sh_addr, | |
1096 | (u64)shdr.sh_offset); | |
1097 | sym.st_value -= shdr.sh_addr - shdr.sh_offset; | |
1098 | } | |
950b8354 | 1099 | new_symbol: |
2a8d41b4 MW |
1100 | demangled = demangle_sym(dso, kmodule, elf_name); |
1101 | if (demangled != NULL) | |
1102 | elf_name = demangled; | |
cae15db7 | 1103 | |
e5a1845f NK |
1104 | f = symbol__new(sym.st_value, sym.st_size, |
1105 | GELF_ST_BIND(sym.st_info), elf_name); | |
1106 | free(demangled); | |
1107 | if (!f) | |
1108 | goto out_elf_end; | |
1109 | ||
0b3c2264 NR |
1110 | arch__sym_update(f, &sym); |
1111 | ||
be39db9f ACM |
1112 | __symbols__insert(&curr_dso->symbols[curr_map->type], f, dso->kernel); |
1113 | nr++; | |
e5a1845f NK |
1114 | } |
1115 | ||
1116 | /* | |
1117 | * For misannotated, zeroed, ASM function sizes. | |
1118 | */ | |
1119 | if (nr > 0) { | |
e5a1845f | 1120 | symbols__fixup_end(&dso->symbols[map->type]); |
432746f8 | 1121 | symbols__fixup_duplicate(&dso->symbols[map->type]); |
e5a1845f NK |
1122 | if (kmap) { |
1123 | /* | |
1124 | * We need to fixup this here too because we create new | |
1125 | * maps here, for things like vsyscall sections. | |
1126 | */ | |
ba92732e | 1127 | __map_groups__fixup_end(kmaps, map->type); |
e5a1845f NK |
1128 | } |
1129 | } | |
1130 | err = nr; | |
1131 | out_elf_end: | |
e5a1845f NK |
1132 | return err; |
1133 | } | |
1134 | ||
8e0cf965 AH |
1135 | static int elf_read_maps(Elf *elf, bool exe, mapfn_t mapfn, void *data) |
1136 | { | |
1137 | GElf_Phdr phdr; | |
1138 | size_t i, phdrnum; | |
1139 | int err; | |
1140 | u64 sz; | |
1141 | ||
1142 | if (elf_getphdrnum(elf, &phdrnum)) | |
1143 | return -1; | |
1144 | ||
1145 | for (i = 0; i < phdrnum; i++) { | |
1146 | if (gelf_getphdr(elf, i, &phdr) == NULL) | |
1147 | return -1; | |
1148 | if (phdr.p_type != PT_LOAD) | |
1149 | continue; | |
1150 | if (exe) { | |
1151 | if (!(phdr.p_flags & PF_X)) | |
1152 | continue; | |
1153 | } else { | |
1154 | if (!(phdr.p_flags & PF_R)) | |
1155 | continue; | |
1156 | } | |
1157 | sz = min(phdr.p_memsz, phdr.p_filesz); | |
1158 | if (!sz) | |
1159 | continue; | |
1160 | err = mapfn(phdr.p_vaddr, sz, phdr.p_offset, data); | |
1161 | if (err) | |
1162 | return err; | |
1163 | } | |
1164 | return 0; | |
1165 | } | |
1166 | ||
1167 | int file__read_maps(int fd, bool exe, mapfn_t mapfn, void *data, | |
1168 | bool *is_64_bit) | |
1169 | { | |
1170 | int err; | |
1171 | Elf *elf; | |
1172 | ||
1173 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
1174 | if (elf == NULL) | |
1175 | return -1; | |
1176 | ||
1177 | if (is_64_bit) | |
1178 | *is_64_bit = (gelf_getclass(elf) == ELFCLASS64); | |
1179 | ||
1180 | err = elf_read_maps(elf, exe, mapfn, data); | |
1181 | ||
1182 | elf_end(elf); | |
1183 | return err; | |
1184 | } | |
1185 | ||
2b5b8bb2 AH |
1186 | enum dso_type dso__type_fd(int fd) |
1187 | { | |
1188 | enum dso_type dso_type = DSO__TYPE_UNKNOWN; | |
1189 | GElf_Ehdr ehdr; | |
1190 | Elf_Kind ek; | |
1191 | Elf *elf; | |
1192 | ||
1193 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
1194 | if (elf == NULL) | |
1195 | goto out; | |
1196 | ||
1197 | ek = elf_kind(elf); | |
1198 | if (ek != ELF_K_ELF) | |
1199 | goto out_end; | |
1200 | ||
1201 | if (gelf_getclass(elf) == ELFCLASS64) { | |
1202 | dso_type = DSO__TYPE_64BIT; | |
1203 | goto out_end; | |
1204 | } | |
1205 | ||
1206 | if (gelf_getehdr(elf, &ehdr) == NULL) | |
1207 | goto out_end; | |
1208 | ||
1209 | if (ehdr.e_machine == EM_X86_64) | |
1210 | dso_type = DSO__TYPE_X32BIT; | |
1211 | else | |
1212 | dso_type = DSO__TYPE_32BIT; | |
1213 | out_end: | |
1214 | elf_end(elf); | |
1215 | out: | |
1216 | return dso_type; | |
1217 | } | |
1218 | ||
afba19d9 AH |
1219 | static int copy_bytes(int from, off_t from_offs, int to, off_t to_offs, u64 len) |
1220 | { | |
1221 | ssize_t r; | |
1222 | size_t n; | |
1223 | int err = -1; | |
1224 | char *buf = malloc(page_size); | |
1225 | ||
1226 | if (buf == NULL) | |
1227 | return -1; | |
1228 | ||
1229 | if (lseek(to, to_offs, SEEK_SET) != to_offs) | |
1230 | goto out; | |
1231 | ||
1232 | if (lseek(from, from_offs, SEEK_SET) != from_offs) | |
1233 | goto out; | |
1234 | ||
1235 | while (len) { | |
1236 | n = page_size; | |
1237 | if (len < n) | |
1238 | n = len; | |
1239 | /* Use read because mmap won't work on proc files */ | |
1240 | r = read(from, buf, n); | |
1241 | if (r < 0) | |
1242 | goto out; | |
1243 | if (!r) | |
1244 | break; | |
1245 | n = r; | |
1246 | r = write(to, buf, n); | |
1247 | if (r < 0) | |
1248 | goto out; | |
1249 | if ((size_t)r != n) | |
1250 | goto out; | |
1251 | len -= n; | |
1252 | } | |
1253 | ||
1254 | err = 0; | |
1255 | out: | |
1256 | free(buf); | |
1257 | return err; | |
1258 | } | |
1259 | ||
1260 | struct kcore { | |
1261 | int fd; | |
1262 | int elfclass; | |
1263 | Elf *elf; | |
1264 | GElf_Ehdr ehdr; | |
1265 | }; | |
1266 | ||
1267 | static int kcore__open(struct kcore *kcore, const char *filename) | |
1268 | { | |
1269 | GElf_Ehdr *ehdr; | |
1270 | ||
1271 | kcore->fd = open(filename, O_RDONLY); | |
1272 | if (kcore->fd == -1) | |
1273 | return -1; | |
1274 | ||
1275 | kcore->elf = elf_begin(kcore->fd, ELF_C_READ, NULL); | |
1276 | if (!kcore->elf) | |
1277 | goto out_close; | |
1278 | ||
1279 | kcore->elfclass = gelf_getclass(kcore->elf); | |
1280 | if (kcore->elfclass == ELFCLASSNONE) | |
1281 | goto out_end; | |
1282 | ||
1283 | ehdr = gelf_getehdr(kcore->elf, &kcore->ehdr); | |
1284 | if (!ehdr) | |
1285 | goto out_end; | |
1286 | ||
1287 | return 0; | |
1288 | ||
1289 | out_end: | |
1290 | elf_end(kcore->elf); | |
1291 | out_close: | |
1292 | close(kcore->fd); | |
1293 | return -1; | |
1294 | } | |
1295 | ||
1296 | static int kcore__init(struct kcore *kcore, char *filename, int elfclass, | |
1297 | bool temp) | |
1298 | { | |
afba19d9 AH |
1299 | kcore->elfclass = elfclass; |
1300 | ||
1301 | if (temp) | |
1302 | kcore->fd = mkstemp(filename); | |
1303 | else | |
1304 | kcore->fd = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0400); | |
1305 | if (kcore->fd == -1) | |
1306 | return -1; | |
1307 | ||
1308 | kcore->elf = elf_begin(kcore->fd, ELF_C_WRITE, NULL); | |
1309 | if (!kcore->elf) | |
1310 | goto out_close; | |
1311 | ||
1312 | if (!gelf_newehdr(kcore->elf, elfclass)) | |
1313 | goto out_end; | |
1314 | ||
b5cabbcb | 1315 | memset(&kcore->ehdr, 0, sizeof(GElf_Ehdr)); |
afba19d9 AH |
1316 | |
1317 | return 0; | |
1318 | ||
1319 | out_end: | |
1320 | elf_end(kcore->elf); | |
1321 | out_close: | |
1322 | close(kcore->fd); | |
1323 | unlink(filename); | |
1324 | return -1; | |
1325 | } | |
1326 | ||
1327 | static void kcore__close(struct kcore *kcore) | |
1328 | { | |
1329 | elf_end(kcore->elf); | |
1330 | close(kcore->fd); | |
1331 | } | |
1332 | ||
1333 | static int kcore__copy_hdr(struct kcore *from, struct kcore *to, size_t count) | |
1334 | { | |
1335 | GElf_Ehdr *ehdr = &to->ehdr; | |
1336 | GElf_Ehdr *kehdr = &from->ehdr; | |
1337 | ||
1338 | memcpy(ehdr->e_ident, kehdr->e_ident, EI_NIDENT); | |
1339 | ehdr->e_type = kehdr->e_type; | |
1340 | ehdr->e_machine = kehdr->e_machine; | |
1341 | ehdr->e_version = kehdr->e_version; | |
1342 | ehdr->e_entry = 0; | |
1343 | ehdr->e_shoff = 0; | |
1344 | ehdr->e_flags = kehdr->e_flags; | |
1345 | ehdr->e_phnum = count; | |
1346 | ehdr->e_shentsize = 0; | |
1347 | ehdr->e_shnum = 0; | |
1348 | ehdr->e_shstrndx = 0; | |
1349 | ||
1350 | if (from->elfclass == ELFCLASS32) { | |
1351 | ehdr->e_phoff = sizeof(Elf32_Ehdr); | |
1352 | ehdr->e_ehsize = sizeof(Elf32_Ehdr); | |
1353 | ehdr->e_phentsize = sizeof(Elf32_Phdr); | |
1354 | } else { | |
1355 | ehdr->e_phoff = sizeof(Elf64_Ehdr); | |
1356 | ehdr->e_ehsize = sizeof(Elf64_Ehdr); | |
1357 | ehdr->e_phentsize = sizeof(Elf64_Phdr); | |
1358 | } | |
1359 | ||
1360 | if (!gelf_update_ehdr(to->elf, ehdr)) | |
1361 | return -1; | |
1362 | ||
1363 | if (!gelf_newphdr(to->elf, count)) | |
1364 | return -1; | |
1365 | ||
1366 | return 0; | |
1367 | } | |
1368 | ||
1369 | static int kcore__add_phdr(struct kcore *kcore, int idx, off_t offset, | |
1370 | u64 addr, u64 len) | |
1371 | { | |
b5cabbcb AH |
1372 | GElf_Phdr phdr = { |
1373 | .p_type = PT_LOAD, | |
1374 | .p_flags = PF_R | PF_W | PF_X, | |
1375 | .p_offset = offset, | |
1376 | .p_vaddr = addr, | |
1377 | .p_paddr = 0, | |
1378 | .p_filesz = len, | |
1379 | .p_memsz = len, | |
1380 | .p_align = page_size, | |
1381 | }; | |
1382 | ||
1383 | if (!gelf_update_phdr(kcore->elf, idx, &phdr)) | |
afba19d9 AH |
1384 | return -1; |
1385 | ||
1386 | return 0; | |
1387 | } | |
1388 | ||
1389 | static off_t kcore__write(struct kcore *kcore) | |
1390 | { | |
1391 | return elf_update(kcore->elf, ELF_C_WRITE); | |
1392 | } | |
1393 | ||
fc1b691d AH |
1394 | struct phdr_data { |
1395 | off_t offset; | |
1396 | u64 addr; | |
1397 | u64 len; | |
1398 | }; | |
1399 | ||
1400 | struct kcore_copy_info { | |
1401 | u64 stext; | |
1402 | u64 etext; | |
1403 | u64 first_symbol; | |
1404 | u64 last_symbol; | |
1405 | u64 first_module; | |
1406 | u64 last_module_symbol; | |
1407 | struct phdr_data kernel_map; | |
1408 | struct phdr_data modules_map; | |
1409 | }; | |
1410 | ||
1411 | static int kcore_copy__process_kallsyms(void *arg, const char *name, char type, | |
1412 | u64 start) | |
1413 | { | |
1414 | struct kcore_copy_info *kci = arg; | |
1415 | ||
1416 | if (!symbol_type__is_a(type, MAP__FUNCTION)) | |
1417 | return 0; | |
1418 | ||
1419 | if (strchr(name, '[')) { | |
1420 | if (start > kci->last_module_symbol) | |
1421 | kci->last_module_symbol = start; | |
1422 | return 0; | |
1423 | } | |
1424 | ||
1425 | if (!kci->first_symbol || start < kci->first_symbol) | |
1426 | kci->first_symbol = start; | |
1427 | ||
1428 | if (!kci->last_symbol || start > kci->last_symbol) | |
1429 | kci->last_symbol = start; | |
1430 | ||
1431 | if (!strcmp(name, "_stext")) { | |
1432 | kci->stext = start; | |
1433 | return 0; | |
1434 | } | |
1435 | ||
1436 | if (!strcmp(name, "_etext")) { | |
1437 | kci->etext = start; | |
1438 | return 0; | |
1439 | } | |
1440 | ||
1441 | return 0; | |
1442 | } | |
1443 | ||
1444 | static int kcore_copy__parse_kallsyms(struct kcore_copy_info *kci, | |
1445 | const char *dir) | |
1446 | { | |
1447 | char kallsyms_filename[PATH_MAX]; | |
1448 | ||
1449 | scnprintf(kallsyms_filename, PATH_MAX, "%s/kallsyms", dir); | |
1450 | ||
1451 | if (symbol__restricted_filename(kallsyms_filename, "/proc/kallsyms")) | |
1452 | return -1; | |
1453 | ||
1454 | if (kallsyms__parse(kallsyms_filename, kci, | |
1455 | kcore_copy__process_kallsyms) < 0) | |
1456 | return -1; | |
1457 | ||
1458 | return 0; | |
1459 | } | |
1460 | ||
1461 | static int kcore_copy__process_modules(void *arg, | |
1462 | const char *name __maybe_unused, | |
9ad4652b | 1463 | u64 start, u64 size __maybe_unused) |
fc1b691d AH |
1464 | { |
1465 | struct kcore_copy_info *kci = arg; | |
1466 | ||
1467 | if (!kci->first_module || start < kci->first_module) | |
1468 | kci->first_module = start; | |
1469 | ||
1470 | return 0; | |
1471 | } | |
1472 | ||
1473 | static int kcore_copy__parse_modules(struct kcore_copy_info *kci, | |
1474 | const char *dir) | |
1475 | { | |
1476 | char modules_filename[PATH_MAX]; | |
1477 | ||
1478 | scnprintf(modules_filename, PATH_MAX, "%s/modules", dir); | |
1479 | ||
1480 | if (symbol__restricted_filename(modules_filename, "/proc/modules")) | |
1481 | return -1; | |
1482 | ||
1483 | if (modules__parse(modules_filename, kci, | |
1484 | kcore_copy__process_modules) < 0) | |
1485 | return -1; | |
1486 | ||
1487 | return 0; | |
1488 | } | |
1489 | ||
1490 | static void kcore_copy__map(struct phdr_data *p, u64 start, u64 end, u64 pgoff, | |
1491 | u64 s, u64 e) | |
1492 | { | |
1493 | if (p->addr || s < start || s >= end) | |
1494 | return; | |
1495 | ||
1496 | p->addr = s; | |
1497 | p->offset = (s - start) + pgoff; | |
1498 | p->len = e < end ? e - s : end - s; | |
1499 | } | |
1500 | ||
1501 | static int kcore_copy__read_map(u64 start, u64 len, u64 pgoff, void *data) | |
1502 | { | |
1503 | struct kcore_copy_info *kci = data; | |
1504 | u64 end = start + len; | |
1505 | ||
1506 | kcore_copy__map(&kci->kernel_map, start, end, pgoff, kci->stext, | |
1507 | kci->etext); | |
1508 | ||
1509 | kcore_copy__map(&kci->modules_map, start, end, pgoff, kci->first_module, | |
1510 | kci->last_module_symbol); | |
1511 | ||
1512 | return 0; | |
1513 | } | |
1514 | ||
1515 | static int kcore_copy__read_maps(struct kcore_copy_info *kci, Elf *elf) | |
1516 | { | |
1517 | if (elf_read_maps(elf, true, kcore_copy__read_map, kci) < 0) | |
1518 | return -1; | |
1519 | ||
1520 | return 0; | |
1521 | } | |
1522 | ||
1523 | static int kcore_copy__calc_maps(struct kcore_copy_info *kci, const char *dir, | |
1524 | Elf *elf) | |
1525 | { | |
1526 | if (kcore_copy__parse_kallsyms(kci, dir)) | |
1527 | return -1; | |
1528 | ||
1529 | if (kcore_copy__parse_modules(kci, dir)) | |
1530 | return -1; | |
1531 | ||
1532 | if (kci->stext) | |
1533 | kci->stext = round_down(kci->stext, page_size); | |
1534 | else | |
1535 | kci->stext = round_down(kci->first_symbol, page_size); | |
1536 | ||
1537 | if (kci->etext) { | |
1538 | kci->etext = round_up(kci->etext, page_size); | |
1539 | } else if (kci->last_symbol) { | |
1540 | kci->etext = round_up(kci->last_symbol, page_size); | |
1541 | kci->etext += page_size; | |
1542 | } | |
1543 | ||
1544 | kci->first_module = round_down(kci->first_module, page_size); | |
1545 | ||
1546 | if (kci->last_module_symbol) { | |
1547 | kci->last_module_symbol = round_up(kci->last_module_symbol, | |
1548 | page_size); | |
1549 | kci->last_module_symbol += page_size; | |
1550 | } | |
1551 | ||
1552 | if (!kci->stext || !kci->etext) | |
1553 | return -1; | |
1554 | ||
1555 | if (kci->first_module && !kci->last_module_symbol) | |
1556 | return -1; | |
1557 | ||
1558 | return kcore_copy__read_maps(kci, elf); | |
1559 | } | |
1560 | ||
1561 | static int kcore_copy__copy_file(const char *from_dir, const char *to_dir, | |
1562 | const char *name) | |
1563 | { | |
1564 | char from_filename[PATH_MAX]; | |
1565 | char to_filename[PATH_MAX]; | |
1566 | ||
1567 | scnprintf(from_filename, PATH_MAX, "%s/%s", from_dir, name); | |
1568 | scnprintf(to_filename, PATH_MAX, "%s/%s", to_dir, name); | |
1569 | ||
1570 | return copyfile_mode(from_filename, to_filename, 0400); | |
1571 | } | |
1572 | ||
1573 | static int kcore_copy__unlink(const char *dir, const char *name) | |
1574 | { | |
1575 | char filename[PATH_MAX]; | |
1576 | ||
1577 | scnprintf(filename, PATH_MAX, "%s/%s", dir, name); | |
1578 | ||
1579 | return unlink(filename); | |
1580 | } | |
1581 | ||
1582 | static int kcore_copy__compare_fds(int from, int to) | |
1583 | { | |
1584 | char *buf_from; | |
1585 | char *buf_to; | |
1586 | ssize_t ret; | |
1587 | size_t len; | |
1588 | int err = -1; | |
1589 | ||
1590 | buf_from = malloc(page_size); | |
1591 | buf_to = malloc(page_size); | |
1592 | if (!buf_from || !buf_to) | |
1593 | goto out; | |
1594 | ||
1595 | while (1) { | |
1596 | /* Use read because mmap won't work on proc files */ | |
1597 | ret = read(from, buf_from, page_size); | |
1598 | if (ret < 0) | |
1599 | goto out; | |
1600 | ||
1601 | if (!ret) | |
1602 | break; | |
1603 | ||
1604 | len = ret; | |
1605 | ||
1606 | if (readn(to, buf_to, len) != (int)len) | |
1607 | goto out; | |
1608 | ||
1609 | if (memcmp(buf_from, buf_to, len)) | |
1610 | goto out; | |
1611 | } | |
1612 | ||
1613 | err = 0; | |
1614 | out: | |
1615 | free(buf_to); | |
1616 | free(buf_from); | |
1617 | return err; | |
1618 | } | |
1619 | ||
1620 | static int kcore_copy__compare_files(const char *from_filename, | |
1621 | const char *to_filename) | |
1622 | { | |
1623 | int from, to, err = -1; | |
1624 | ||
1625 | from = open(from_filename, O_RDONLY); | |
1626 | if (from < 0) | |
1627 | return -1; | |
1628 | ||
1629 | to = open(to_filename, O_RDONLY); | |
1630 | if (to < 0) | |
1631 | goto out_close_from; | |
1632 | ||
1633 | err = kcore_copy__compare_fds(from, to); | |
1634 | ||
1635 | close(to); | |
1636 | out_close_from: | |
1637 | close(from); | |
1638 | return err; | |
1639 | } | |
1640 | ||
1641 | static int kcore_copy__compare_file(const char *from_dir, const char *to_dir, | |
1642 | const char *name) | |
1643 | { | |
1644 | char from_filename[PATH_MAX]; | |
1645 | char to_filename[PATH_MAX]; | |
1646 | ||
1647 | scnprintf(from_filename, PATH_MAX, "%s/%s", from_dir, name); | |
1648 | scnprintf(to_filename, PATH_MAX, "%s/%s", to_dir, name); | |
1649 | ||
1650 | return kcore_copy__compare_files(from_filename, to_filename); | |
1651 | } | |
1652 | ||
1653 | /** | |
1654 | * kcore_copy - copy kallsyms, modules and kcore from one directory to another. | |
1655 | * @from_dir: from directory | |
1656 | * @to_dir: to directory | |
1657 | * | |
1658 | * This function copies kallsyms, modules and kcore files from one directory to | |
1659 | * another. kallsyms and modules are copied entirely. Only code segments are | |
1660 | * copied from kcore. It is assumed that two segments suffice: one for the | |
1661 | * kernel proper and one for all the modules. The code segments are determined | |
1662 | * from kallsyms and modules files. The kernel map starts at _stext or the | |
1663 | * lowest function symbol, and ends at _etext or the highest function symbol. | |
1664 | * The module map starts at the lowest module address and ends at the highest | |
1665 | * module symbol. Start addresses are rounded down to the nearest page. End | |
1666 | * addresses are rounded up to the nearest page. An extra page is added to the | |
1667 | * highest kernel symbol and highest module symbol to, hopefully, encompass that | |
1668 | * symbol too. Because it contains only code sections, the resulting kcore is | |
1669 | * unusual. One significant peculiarity is that the mapping (start -> pgoff) | |
1670 | * is not the same for the kernel map and the modules map. That happens because | |
1671 | * the data is copied adjacently whereas the original kcore has gaps. Finally, | |
1672 | * kallsyms and modules files are compared with their copies to check that | |
1673 | * modules have not been loaded or unloaded while the copies were taking place. | |
1674 | * | |
1675 | * Return: %0 on success, %-1 on failure. | |
1676 | */ | |
1677 | int kcore_copy(const char *from_dir, const char *to_dir) | |
1678 | { | |
1679 | struct kcore kcore; | |
1680 | struct kcore extract; | |
1681 | size_t count = 2; | |
1682 | int idx = 0, err = -1; | |
1683 | off_t offset = page_size, sz, modules_offset = 0; | |
1684 | struct kcore_copy_info kci = { .stext = 0, }; | |
1685 | char kcore_filename[PATH_MAX]; | |
1686 | char extract_filename[PATH_MAX]; | |
1687 | ||
1688 | if (kcore_copy__copy_file(from_dir, to_dir, "kallsyms")) | |
1689 | return -1; | |
1690 | ||
1691 | if (kcore_copy__copy_file(from_dir, to_dir, "modules")) | |
1692 | goto out_unlink_kallsyms; | |
1693 | ||
1694 | scnprintf(kcore_filename, PATH_MAX, "%s/kcore", from_dir); | |
1695 | scnprintf(extract_filename, PATH_MAX, "%s/kcore", to_dir); | |
1696 | ||
1697 | if (kcore__open(&kcore, kcore_filename)) | |
1698 | goto out_unlink_modules; | |
1699 | ||
1700 | if (kcore_copy__calc_maps(&kci, from_dir, kcore.elf)) | |
1701 | goto out_kcore_close; | |
1702 | ||
1703 | if (kcore__init(&extract, extract_filename, kcore.elfclass, false)) | |
1704 | goto out_kcore_close; | |
1705 | ||
1706 | if (!kci.modules_map.addr) | |
1707 | count -= 1; | |
1708 | ||
1709 | if (kcore__copy_hdr(&kcore, &extract, count)) | |
1710 | goto out_extract_close; | |
1711 | ||
1712 | if (kcore__add_phdr(&extract, idx++, offset, kci.kernel_map.addr, | |
1713 | kci.kernel_map.len)) | |
1714 | goto out_extract_close; | |
1715 | ||
1716 | if (kci.modules_map.addr) { | |
1717 | modules_offset = offset + kci.kernel_map.len; | |
1718 | if (kcore__add_phdr(&extract, idx, modules_offset, | |
1719 | kci.modules_map.addr, kci.modules_map.len)) | |
1720 | goto out_extract_close; | |
1721 | } | |
1722 | ||
1723 | sz = kcore__write(&extract); | |
1724 | if (sz < 0 || sz > offset) | |
1725 | goto out_extract_close; | |
1726 | ||
1727 | if (copy_bytes(kcore.fd, kci.kernel_map.offset, extract.fd, offset, | |
1728 | kci.kernel_map.len)) | |
1729 | goto out_extract_close; | |
1730 | ||
1731 | if (modules_offset && copy_bytes(kcore.fd, kci.modules_map.offset, | |
1732 | extract.fd, modules_offset, | |
1733 | kci.modules_map.len)) | |
1734 | goto out_extract_close; | |
1735 | ||
1736 | if (kcore_copy__compare_file(from_dir, to_dir, "modules")) | |
1737 | goto out_extract_close; | |
1738 | ||
1739 | if (kcore_copy__compare_file(from_dir, to_dir, "kallsyms")) | |
1740 | goto out_extract_close; | |
1741 | ||
1742 | err = 0; | |
1743 | ||
1744 | out_extract_close: | |
1745 | kcore__close(&extract); | |
1746 | if (err) | |
1747 | unlink(extract_filename); | |
1748 | out_kcore_close: | |
1749 | kcore__close(&kcore); | |
1750 | out_unlink_modules: | |
1751 | if (err) | |
1752 | kcore_copy__unlink(to_dir, "modules"); | |
1753 | out_unlink_kallsyms: | |
1754 | if (err) | |
1755 | kcore_copy__unlink(to_dir, "kallsyms"); | |
1756 | ||
1757 | return err; | |
1758 | } | |
1759 | ||
afba19d9 AH |
1760 | int kcore_extract__create(struct kcore_extract *kce) |
1761 | { | |
1762 | struct kcore kcore; | |
1763 | struct kcore extract; | |
1764 | size_t count = 1; | |
1765 | int idx = 0, err = -1; | |
1766 | off_t offset = page_size, sz; | |
1767 | ||
1768 | if (kcore__open(&kcore, kce->kcore_filename)) | |
1769 | return -1; | |
1770 | ||
1771 | strcpy(kce->extract_filename, PERF_KCORE_EXTRACT); | |
1772 | if (kcore__init(&extract, kce->extract_filename, kcore.elfclass, true)) | |
1773 | goto out_kcore_close; | |
1774 | ||
1775 | if (kcore__copy_hdr(&kcore, &extract, count)) | |
1776 | goto out_extract_close; | |
1777 | ||
1778 | if (kcore__add_phdr(&extract, idx, offset, kce->addr, kce->len)) | |
1779 | goto out_extract_close; | |
1780 | ||
1781 | sz = kcore__write(&extract); | |
1782 | if (sz < 0 || sz > offset) | |
1783 | goto out_extract_close; | |
1784 | ||
1785 | if (copy_bytes(kcore.fd, kce->offs, extract.fd, offset, kce->len)) | |
1786 | goto out_extract_close; | |
1787 | ||
1788 | err = 0; | |
1789 | ||
1790 | out_extract_close: | |
1791 | kcore__close(&extract); | |
1792 | if (err) | |
1793 | unlink(kce->extract_filename); | |
1794 | out_kcore_close: | |
1795 | kcore__close(&kcore); | |
1796 | ||
1797 | return err; | |
1798 | } | |
1799 | ||
1800 | void kcore_extract__delete(struct kcore_extract *kce) | |
1801 | { | |
1802 | unlink(kce->extract_filename); | |
1803 | } | |
1804 | ||
1c1a3a47 | 1805 | #ifdef HAVE_GELF_GETNOTE_SUPPORT |
060fa0c7 HK |
1806 | /** |
1807 | * populate_sdt_note : Parse raw data and identify SDT note | |
1808 | * @elf: elf of the opened file | |
1809 | * @data: raw data of a section with description offset applied | |
1810 | * @len: note description size | |
1811 | * @type: type of the note | |
1812 | * @sdt_notes: List to add the SDT note | |
1813 | * | |
1814 | * Responsible for parsing the @data in section .note.stapsdt in @elf and | |
1815 | * if its an SDT note, it appends to @sdt_notes list. | |
1816 | */ | |
1817 | static int populate_sdt_note(Elf **elf, const char *data, size_t len, | |
1818 | struct list_head *sdt_notes) | |
1819 | { | |
be88184b | 1820 | const char *provider, *name, *args; |
060fa0c7 HK |
1821 | struct sdt_note *tmp = NULL; |
1822 | GElf_Ehdr ehdr; | |
1823 | GElf_Addr base_off = 0; | |
1824 | GElf_Shdr shdr; | |
1825 | int ret = -EINVAL; | |
1826 | ||
1827 | union { | |
1828 | Elf64_Addr a64[NR_ADDR]; | |
1829 | Elf32_Addr a32[NR_ADDR]; | |
1830 | } buf; | |
1831 | ||
1832 | Elf_Data dst = { | |
1833 | .d_buf = &buf, .d_type = ELF_T_ADDR, .d_version = EV_CURRENT, | |
1834 | .d_size = gelf_fsize((*elf), ELF_T_ADDR, NR_ADDR, EV_CURRENT), | |
1835 | .d_off = 0, .d_align = 0 | |
1836 | }; | |
1837 | Elf_Data src = { | |
1838 | .d_buf = (void *) data, .d_type = ELF_T_ADDR, | |
1839 | .d_version = EV_CURRENT, .d_size = dst.d_size, .d_off = 0, | |
1840 | .d_align = 0 | |
1841 | }; | |
1842 | ||
1843 | tmp = (struct sdt_note *)calloc(1, sizeof(struct sdt_note)); | |
1844 | if (!tmp) { | |
1845 | ret = -ENOMEM; | |
1846 | goto out_err; | |
1847 | } | |
1848 | ||
1849 | INIT_LIST_HEAD(&tmp->note_list); | |
1850 | ||
1851 | if (len < dst.d_size + 3) | |
1852 | goto out_free_note; | |
1853 | ||
1854 | /* Translation from file representation to memory representation */ | |
1855 | if (gelf_xlatetom(*elf, &dst, &src, | |
1856 | elf_getident(*elf, NULL)[EI_DATA]) == NULL) { | |
1857 | pr_err("gelf_xlatetom : %s\n", elf_errmsg(-1)); | |
1858 | goto out_free_note; | |
1859 | } | |
1860 | ||
1861 | /* Populate the fields of sdt_note */ | |
1862 | provider = data + dst.d_size; | |
1863 | ||
1864 | name = (const char *)memchr(provider, '\0', data + len - provider); | |
1865 | if (name++ == NULL) | |
1866 | goto out_free_note; | |
1867 | ||
1868 | tmp->provider = strdup(provider); | |
1869 | if (!tmp->provider) { | |
1870 | ret = -ENOMEM; | |
1871 | goto out_free_note; | |
1872 | } | |
1873 | tmp->name = strdup(name); | |
1874 | if (!tmp->name) { | |
1875 | ret = -ENOMEM; | |
1876 | goto out_free_prov; | |
1877 | } | |
1878 | ||
be88184b AB |
1879 | args = memchr(name, '\0', data + len - name); |
1880 | ||
1881 | /* | |
1882 | * There is no argument if: | |
1883 | * - We reached the end of the note; | |
1884 | * - There is not enough room to hold a potential string; | |
1885 | * - The argument string is empty or just contains ':'. | |
1886 | */ | |
1887 | if (args == NULL || data + len - args < 2 || | |
1888 | args[1] == ':' || args[1] == '\0') | |
1889 | tmp->args = NULL; | |
1890 | else { | |
1891 | tmp->args = strdup(++args); | |
1892 | if (!tmp->args) { | |
1893 | ret = -ENOMEM; | |
1894 | goto out_free_name; | |
1895 | } | |
1896 | } | |
1897 | ||
060fa0c7 HK |
1898 | if (gelf_getclass(*elf) == ELFCLASS32) { |
1899 | memcpy(&tmp->addr, &buf, 3 * sizeof(Elf32_Addr)); | |
1900 | tmp->bit32 = true; | |
1901 | } else { | |
1902 | memcpy(&tmp->addr, &buf, 3 * sizeof(Elf64_Addr)); | |
1903 | tmp->bit32 = false; | |
1904 | } | |
1905 | ||
1906 | if (!gelf_getehdr(*elf, &ehdr)) { | |
1907 | pr_debug("%s : cannot get elf header.\n", __func__); | |
1908 | ret = -EBADF; | |
be88184b | 1909 | goto out_free_args; |
060fa0c7 HK |
1910 | } |
1911 | ||
1912 | /* Adjust the prelink effect : | |
1913 | * Find out the .stapsdt.base section. | |
1914 | * This scn will help us to handle prelinking (if present). | |
1915 | * Compare the retrieved file offset of the base section with the | |
1916 | * base address in the description of the SDT note. If its different, | |
1917 | * then accordingly, adjust the note location. | |
1918 | */ | |
1919 | if (elf_section_by_name(*elf, &ehdr, &shdr, SDT_BASE_SCN, NULL)) { | |
1920 | base_off = shdr.sh_offset; | |
1921 | if (base_off) { | |
1922 | if (tmp->bit32) | |
1923 | tmp->addr.a32[0] = tmp->addr.a32[0] + base_off - | |
1924 | tmp->addr.a32[1]; | |
1925 | else | |
1926 | tmp->addr.a64[0] = tmp->addr.a64[0] + base_off - | |
1927 | tmp->addr.a64[1]; | |
1928 | } | |
1929 | } | |
1930 | ||
1931 | list_add_tail(&tmp->note_list, sdt_notes); | |
1932 | return 0; | |
1933 | ||
be88184b AB |
1934 | out_free_args: |
1935 | free(tmp->args); | |
060fa0c7 HK |
1936 | out_free_name: |
1937 | free(tmp->name); | |
1938 | out_free_prov: | |
1939 | free(tmp->provider); | |
1940 | out_free_note: | |
1941 | free(tmp); | |
1942 | out_err: | |
1943 | return ret; | |
1944 | } | |
1945 | ||
1946 | /** | |
1947 | * construct_sdt_notes_list : constructs a list of SDT notes | |
1948 | * @elf : elf to look into | |
1949 | * @sdt_notes : empty list_head | |
1950 | * | |
1951 | * Scans the sections in 'elf' for the section | |
1952 | * .note.stapsdt. It, then calls populate_sdt_note to find | |
1953 | * out the SDT events and populates the 'sdt_notes'. | |
1954 | */ | |
1955 | static int construct_sdt_notes_list(Elf *elf, struct list_head *sdt_notes) | |
1956 | { | |
1957 | GElf_Ehdr ehdr; | |
1958 | Elf_Scn *scn = NULL; | |
1959 | Elf_Data *data; | |
1960 | GElf_Shdr shdr; | |
1961 | size_t shstrndx, next; | |
1962 | GElf_Nhdr nhdr; | |
1963 | size_t name_off, desc_off, offset; | |
1964 | int ret = 0; | |
1965 | ||
1966 | if (gelf_getehdr(elf, &ehdr) == NULL) { | |
1967 | ret = -EBADF; | |
1968 | goto out_ret; | |
1969 | } | |
1970 | if (elf_getshdrstrndx(elf, &shstrndx) != 0) { | |
1971 | ret = -EBADF; | |
1972 | goto out_ret; | |
1973 | } | |
1974 | ||
1975 | /* Look for the required section */ | |
1976 | scn = elf_section_by_name(elf, &ehdr, &shdr, SDT_NOTE_SCN, NULL); | |
1977 | if (!scn) { | |
1978 | ret = -ENOENT; | |
1979 | goto out_ret; | |
1980 | } | |
1981 | ||
1982 | if ((shdr.sh_type != SHT_NOTE) || (shdr.sh_flags & SHF_ALLOC)) { | |
1983 | ret = -ENOENT; | |
1984 | goto out_ret; | |
1985 | } | |
1986 | ||
1987 | data = elf_getdata(scn, NULL); | |
1988 | ||
1989 | /* Get the SDT notes */ | |
1990 | for (offset = 0; (next = gelf_getnote(data, offset, &nhdr, &name_off, | |
1991 | &desc_off)) > 0; offset = next) { | |
1992 | if (nhdr.n_namesz == sizeof(SDT_NOTE_NAME) && | |
1993 | !memcmp(data->d_buf + name_off, SDT_NOTE_NAME, | |
1994 | sizeof(SDT_NOTE_NAME))) { | |
1995 | /* Check the type of the note */ | |
1996 | if (nhdr.n_type != SDT_NOTE_TYPE) | |
1997 | goto out_ret; | |
1998 | ||
1999 | ret = populate_sdt_note(&elf, ((data->d_buf) + desc_off), | |
2000 | nhdr.n_descsz, sdt_notes); | |
2001 | if (ret < 0) | |
2002 | goto out_ret; | |
2003 | } | |
2004 | } | |
2005 | if (list_empty(sdt_notes)) | |
2006 | ret = -ENOENT; | |
2007 | ||
2008 | out_ret: | |
2009 | return ret; | |
2010 | } | |
2011 | ||
2012 | /** | |
2013 | * get_sdt_note_list : Wrapper to construct a list of sdt notes | |
2014 | * @head : empty list_head | |
2015 | * @target : file to find SDT notes from | |
2016 | * | |
2017 | * This opens the file, initializes | |
2018 | * the ELF and then calls construct_sdt_notes_list. | |
2019 | */ | |
2020 | int get_sdt_note_list(struct list_head *head, const char *target) | |
2021 | { | |
2022 | Elf *elf; | |
2023 | int fd, ret; | |
2024 | ||
2025 | fd = open(target, O_RDONLY); | |
2026 | if (fd < 0) | |
2027 | return -EBADF; | |
2028 | ||
2029 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
2030 | if (!elf) { | |
2031 | ret = -EBADF; | |
2032 | goto out_close; | |
2033 | } | |
2034 | ret = construct_sdt_notes_list(elf, head); | |
2035 | elf_end(elf); | |
2036 | out_close: | |
2037 | close(fd); | |
2038 | return ret; | |
2039 | } | |
2040 | ||
2041 | /** | |
2042 | * cleanup_sdt_note_list : free the sdt notes' list | |
2043 | * @sdt_notes: sdt notes' list | |
2044 | * | |
2045 | * Free up the SDT notes in @sdt_notes. | |
2046 | * Returns the number of SDT notes free'd. | |
2047 | */ | |
2048 | int cleanup_sdt_note_list(struct list_head *sdt_notes) | |
2049 | { | |
2050 | struct sdt_note *tmp, *pos; | |
2051 | int nr_free = 0; | |
2052 | ||
2053 | list_for_each_entry_safe(pos, tmp, sdt_notes, note_list) { | |
2054 | list_del(&pos->note_list); | |
2055 | free(pos->name); | |
2056 | free(pos->provider); | |
2057 | free(pos); | |
2058 | nr_free++; | |
2059 | } | |
2060 | return nr_free; | |
2061 | } | |
2062 | ||
2063 | /** | |
2064 | * sdt_notes__get_count: Counts the number of sdt events | |
2065 | * @start: list_head to sdt_notes list | |
2066 | * | |
2067 | * Returns the number of SDT notes in a list | |
2068 | */ | |
2069 | int sdt_notes__get_count(struct list_head *start) | |
2070 | { | |
2071 | struct sdt_note *sdt_ptr; | |
2072 | int count = 0; | |
2073 | ||
2074 | list_for_each_entry(sdt_ptr, start, note_list) | |
2075 | count++; | |
2076 | return count; | |
2077 | } | |
1c1a3a47 | 2078 | #endif |
060fa0c7 | 2079 | |
e5a1845f NK |
2080 | void symbol__elf_init(void) |
2081 | { | |
2082 | elf_version(EV_CURRENT); | |
2083 | } |