Commit | Line | Data |
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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> | |
215a0d30 | 5 | #include <stdlib.h> |
e5a1845f NK |
6 | #include <string.h> |
7 | #include <unistd.h> | |
8 | #include <inttypes.h> | |
9 | ||
1101f69a | 10 | #include "map.h" |
41f30914 | 11 | #include "map_groups.h" |
e5a1845f | 12 | #include "symbol.h" |
b1d1b094 | 13 | #include "symsrc.h" |
e9c4bcdd | 14 | #include "demangle-java.h" |
cae15db7 | 15 | #include "demangle-rust.h" |
8fa7d87f | 16 | #include "machine.h" |
922d0e4d | 17 | #include "vdso.h" |
e5a1845f | 18 | #include "debug.h" |
cf8b6970 | 19 | #include "util.h" |
3052ba56 | 20 | #include <linux/ctype.h> |
fb71c86c | 21 | #include <linux/kernel.h> |
7f7c536f | 22 | #include <linux/zalloc.h> |
3d689ed6 | 23 | #include <symbol/kallsyms.h> |
fb71c86c | 24 | #include <internal/lib.h> |
e5a1845f | 25 | |
e370a3d5 DA |
26 | #ifndef EM_AARCH64 |
27 | #define EM_AARCH64 183 /* ARM 64 bit */ | |
28 | #endif | |
29 | ||
843cf70e ACM |
30 | #ifndef ELF32_ST_VISIBILITY |
31 | #define ELF32_ST_VISIBILITY(o) ((o) & 0x03) | |
32 | #endif | |
33 | ||
34 | /* For ELF64 the definitions are the same. */ | |
35 | #ifndef ELF64_ST_VISIBILITY | |
36 | #define ELF64_ST_VISIBILITY(o) ELF32_ST_VISIBILITY (o) | |
37 | #endif | |
38 | ||
39 | /* How to extract information held in the st_other field. */ | |
40 | #ifndef GELF_ST_VISIBILITY | |
41 | #define GELF_ST_VISIBILITY(val) ELF64_ST_VISIBILITY (val) | |
42 | #endif | |
43 | ||
cc31078c | 44 | typedef Elf64_Nhdr GElf_Nhdr; |
e370a3d5 | 45 | |
9bea81b3 ACM |
46 | #ifndef DMGL_PARAMS |
47 | #define DMGL_NO_OPTS 0 /* For readability... */ | |
48 | #define DMGL_PARAMS (1 << 0) /* Include function args */ | |
49 | #define DMGL_ANSI (1 << 1) /* Include const, volatile, etc */ | |
50 | #endif | |
51 | ||
aaba4e12 ACM |
52 | #ifdef HAVE_CPLUS_DEMANGLE_SUPPORT |
53 | extern char *cplus_demangle(const char *, int); | |
54 | ||
55 | static inline char *bfd_demangle(void __maybe_unused *v, const char *c, int i) | |
56 | { | |
57 | return cplus_demangle(c, i); | |
58 | } | |
59 | #else | |
60 | #ifdef NO_DEMANGLE | |
61 | static inline char *bfd_demangle(void __maybe_unused *v, | |
62 | const char __maybe_unused *c, | |
63 | int __maybe_unused i) | |
64 | { | |
65 | return NULL; | |
66 | } | |
67 | #else | |
68 | #define PACKAGE 'perf' | |
69 | #include <bfd.h> | |
70 | #endif | |
71 | #endif | |
72 | ||
89fe808a | 73 | #ifndef HAVE_ELF_GETPHDRNUM_SUPPORT |
179f36dd | 74 | static int elf_getphdrnum(Elf *elf, size_t *dst) |
e955d5c4 AH |
75 | { |
76 | GElf_Ehdr gehdr; | |
77 | GElf_Ehdr *ehdr; | |
78 | ||
79 | ehdr = gelf_getehdr(elf, &gehdr); | |
80 | if (!ehdr) | |
81 | return -1; | |
82 | ||
83 | *dst = ehdr->e_phnum; | |
84 | ||
85 | return 0; | |
86 | } | |
87 | #endif | |
88 | ||
2492c465 ACM |
89 | #ifndef HAVE_ELF_GETSHDRSTRNDX_SUPPORT |
90 | static int elf_getshdrstrndx(Elf *elf __maybe_unused, size_t *dst __maybe_unused) | |
91 | { | |
92 | pr_err("%s: update your libelf to > 0.140, this one lacks elf_getshdrstrndx().\n", __func__); | |
93 | return -1; | |
94 | } | |
95 | #endif | |
96 | ||
e5a1845f NK |
97 | #ifndef NT_GNU_BUILD_ID |
98 | #define NT_GNU_BUILD_ID 3 | |
99 | #endif | |
100 | ||
101 | /** | |
102 | * elf_symtab__for_each_symbol - iterate thru all the symbols | |
103 | * | |
104 | * @syms: struct elf_symtab instance to iterate | |
105 | * @idx: uint32_t idx | |
106 | * @sym: GElf_Sym iterator | |
107 | */ | |
108 | #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \ | |
109 | for (idx = 0, gelf_getsym(syms, idx, &sym);\ | |
110 | idx < nr_syms; \ | |
111 | idx++, gelf_getsym(syms, idx, &sym)) | |
112 | ||
113 | static inline uint8_t elf_sym__type(const GElf_Sym *sym) | |
114 | { | |
115 | return GELF_ST_TYPE(sym->st_info); | |
116 | } | |
117 | ||
59a17706 JO |
118 | static inline uint8_t elf_sym__visibility(const GElf_Sym *sym) |
119 | { | |
120 | return GELF_ST_VISIBILITY(sym->st_other); | |
121 | } | |
122 | ||
4e31050f VL |
123 | #ifndef STT_GNU_IFUNC |
124 | #define STT_GNU_IFUNC 10 | |
125 | #endif | |
126 | ||
e5a1845f NK |
127 | static inline int elf_sym__is_function(const GElf_Sym *sym) |
128 | { | |
a2f3b6bf AH |
129 | return (elf_sym__type(sym) == STT_FUNC || |
130 | elf_sym__type(sym) == STT_GNU_IFUNC) && | |
e5a1845f NK |
131 | sym->st_name != 0 && |
132 | sym->st_shndx != SHN_UNDEF; | |
133 | } | |
134 | ||
135 | static inline bool elf_sym__is_object(const GElf_Sym *sym) | |
136 | { | |
137 | return elf_sym__type(sym) == STT_OBJECT && | |
138 | sym->st_name != 0 && | |
139 | sym->st_shndx != SHN_UNDEF; | |
140 | } | |
141 | ||
142 | static inline int elf_sym__is_label(const GElf_Sym *sym) | |
143 | { | |
144 | return elf_sym__type(sym) == STT_NOTYPE && | |
145 | sym->st_name != 0 && | |
146 | sym->st_shndx != SHN_UNDEF && | |
59a17706 JO |
147 | sym->st_shndx != SHN_ABS && |
148 | elf_sym__visibility(sym) != STV_HIDDEN && | |
149 | elf_sym__visibility(sym) != STV_INTERNAL; | |
e5a1845f NK |
150 | } |
151 | ||
3183f8ca | 152 | static bool elf_sym__filter(GElf_Sym *sym) |
e5a1845f | 153 | { |
3183f8ca | 154 | return elf_sym__is_function(sym) || elf_sym__is_object(sym); |
e5a1845f NK |
155 | } |
156 | ||
157 | static inline const char *elf_sym__name(const GElf_Sym *sym, | |
158 | const Elf_Data *symstrs) | |
159 | { | |
160 | return symstrs->d_buf + sym->st_name; | |
161 | } | |
162 | ||
163 | static inline const char *elf_sec__name(const GElf_Shdr *shdr, | |
164 | const Elf_Data *secstrs) | |
165 | { | |
166 | return secstrs->d_buf + shdr->sh_name; | |
167 | } | |
168 | ||
169 | static inline int elf_sec__is_text(const GElf_Shdr *shdr, | |
170 | const Elf_Data *secstrs) | |
171 | { | |
172 | return strstr(elf_sec__name(shdr, secstrs), "text") != NULL; | |
173 | } | |
174 | ||
175 | static inline bool elf_sec__is_data(const GElf_Shdr *shdr, | |
176 | const Elf_Data *secstrs) | |
177 | { | |
178 | return strstr(elf_sec__name(shdr, secstrs), "data") != NULL; | |
179 | } | |
180 | ||
3183f8ca | 181 | static bool elf_sec__filter(GElf_Shdr *shdr, Elf_Data *secstrs) |
e5a1845f | 182 | { |
3183f8ca ACM |
183 | return elf_sec__is_text(shdr, secstrs) || |
184 | elf_sec__is_data(shdr, secstrs); | |
e5a1845f NK |
185 | } |
186 | ||
187 | static size_t elf_addr_to_index(Elf *elf, GElf_Addr addr) | |
188 | { | |
189 | Elf_Scn *sec = NULL; | |
190 | GElf_Shdr shdr; | |
191 | size_t cnt = 1; | |
192 | ||
193 | while ((sec = elf_nextscn(elf, sec)) != NULL) { | |
194 | gelf_getshdr(sec, &shdr); | |
195 | ||
196 | if ((addr >= shdr.sh_addr) && | |
197 | (addr < (shdr.sh_addr + shdr.sh_size))) | |
198 | return cnt; | |
199 | ||
200 | ++cnt; | |
201 | } | |
202 | ||
203 | return -1; | |
204 | } | |
205 | ||
99ca4233 MH |
206 | Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep, |
207 | GElf_Shdr *shp, const char *name, size_t *idx) | |
e5a1845f NK |
208 | { |
209 | Elf_Scn *sec = NULL; | |
210 | size_t cnt = 1; | |
211 | ||
49274654 CS |
212 | /* Elf is corrupted/truncated, avoid calling elf_strptr. */ |
213 | if (!elf_rawdata(elf_getscn(elf, ep->e_shstrndx), NULL)) | |
214 | return NULL; | |
215 | ||
e5a1845f NK |
216 | while ((sec = elf_nextscn(elf, sec)) != NULL) { |
217 | char *str; | |
218 | ||
219 | gelf_getshdr(sec, shp); | |
220 | str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name); | |
155b3a13 | 221 | if (str && !strcmp(name, str)) { |
e5a1845f NK |
222 | if (idx) |
223 | *idx = cnt; | |
155b3a13 | 224 | return sec; |
e5a1845f NK |
225 | } |
226 | ++cnt; | |
227 | } | |
228 | ||
155b3a13 | 229 | return NULL; |
e5a1845f NK |
230 | } |
231 | ||
2a8d41b4 MW |
232 | static bool want_demangle(bool is_kernel_sym) |
233 | { | |
234 | return is_kernel_sym ? symbol_conf.demangle_kernel : symbol_conf.demangle; | |
235 | } | |
236 | ||
237 | static char *demangle_sym(struct dso *dso, int kmodule, const char *elf_name) | |
238 | { | |
bb963e16 | 239 | int demangle_flags = verbose > 0 ? (DMGL_PARAMS | DMGL_ANSI) : DMGL_NO_OPTS; |
2a8d41b4 MW |
240 | char *demangled = NULL; |
241 | ||
242 | /* | |
243 | * We need to figure out if the object was created from C++ sources | |
244 | * DWARF DW_compile_unit has this, but we don't always have access | |
245 | * to it... | |
246 | */ | |
247 | if (!want_demangle(dso->kernel || kmodule)) | |
248 | return demangled; | |
249 | ||
250 | demangled = bfd_demangle(NULL, elf_name, demangle_flags); | |
251 | if (demangled == NULL) | |
252 | demangled = java_demangle_sym(elf_name, JAVA_DEMANGLE_NORET); | |
253 | else if (rust_is_mangled(demangled)) | |
254 | /* | |
255 | * Input to Rust demangling is the BFD-demangled | |
256 | * name which it Rust-demangles in place. | |
257 | */ | |
258 | rust_demangle_sym(demangled); | |
259 | ||
260 | return demangled; | |
261 | } | |
262 | ||
e5a1845f NK |
263 | #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \ |
264 | for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \ | |
265 | idx < nr_entries; \ | |
266 | ++idx, pos = gelf_getrel(reldata, idx, &pos_mem)) | |
267 | ||
268 | #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \ | |
269 | for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \ | |
270 | idx < nr_entries; \ | |
271 | ++idx, pos = gelf_getrela(reldata, idx, &pos_mem)) | |
272 | ||
273 | /* | |
274 | * We need to check if we have a .dynsym, so that we can handle the | |
275 | * .plt, synthesizing its symbols, that aren't on the symtabs (be it | |
276 | * .dynsym or .symtab). | |
277 | * And always look at the original dso, not at debuginfo packages, that | |
278 | * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS). | |
279 | */ | |
3183f8ca | 280 | int dso__synthesize_plt_symbols(struct dso *dso, struct symsrc *ss) |
e5a1845f NK |
281 | { |
282 | uint32_t nr_rel_entries, idx; | |
283 | GElf_Sym sym; | |
b2f76050 | 284 | u64 plt_offset, plt_header_size, plt_entry_size; |
e5a1845f NK |
285 | GElf_Shdr shdr_plt; |
286 | struct symbol *f; | |
287 | GElf_Shdr shdr_rel_plt, shdr_dynsym; | |
288 | Elf_Data *reldata, *syms, *symstrs; | |
289 | Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym; | |
290 | size_t dynsym_idx; | |
291 | GElf_Ehdr ehdr; | |
292 | char sympltname[1024]; | |
293 | Elf *elf; | |
a44f605b | 294 | int nr = 0, symidx, err = 0; |
e5a1845f | 295 | |
f47b58b7 DA |
296 | if (!ss->dynsym) |
297 | return 0; | |
298 | ||
a44f605b CS |
299 | elf = ss->elf; |
300 | ehdr = ss->ehdr; | |
e5a1845f | 301 | |
a44f605b CS |
302 | scn_dynsym = ss->dynsym; |
303 | shdr_dynsym = ss->dynshdr; | |
304 | dynsym_idx = ss->dynsym_idx; | |
e5a1845f | 305 | |
e5a1845f NK |
306 | if (scn_dynsym == NULL) |
307 | goto out_elf_end; | |
308 | ||
309 | scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt, | |
310 | ".rela.plt", NULL); | |
311 | if (scn_plt_rel == NULL) { | |
312 | scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt, | |
313 | ".rel.plt", NULL); | |
314 | if (scn_plt_rel == NULL) | |
315 | goto out_elf_end; | |
316 | } | |
317 | ||
318 | err = -1; | |
319 | ||
320 | if (shdr_rel_plt.sh_link != dynsym_idx) | |
321 | goto out_elf_end; | |
322 | ||
323 | if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL) | |
324 | goto out_elf_end; | |
325 | ||
326 | /* | |
327 | * Fetch the relocation section to find the idxes to the GOT | |
328 | * and the symbols in the .dynsym they refer to. | |
329 | */ | |
330 | reldata = elf_getdata(scn_plt_rel, NULL); | |
331 | if (reldata == NULL) | |
332 | goto out_elf_end; | |
333 | ||
334 | syms = elf_getdata(scn_dynsym, NULL); | |
335 | if (syms == NULL) | |
336 | goto out_elf_end; | |
337 | ||
338 | scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link); | |
339 | if (scn_symstrs == NULL) | |
340 | goto out_elf_end; | |
341 | ||
342 | symstrs = elf_getdata(scn_symstrs, NULL); | |
343 | if (symstrs == NULL) | |
344 | goto out_elf_end; | |
345 | ||
52f9ddba CS |
346 | if (symstrs->d_size == 0) |
347 | goto out_elf_end; | |
348 | ||
e5a1845f NK |
349 | nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize; |
350 | plt_offset = shdr_plt.sh_offset; | |
b2f76050 LB |
351 | switch (ehdr.e_machine) { |
352 | case EM_ARM: | |
353 | plt_header_size = 20; | |
354 | plt_entry_size = 12; | |
355 | break; | |
356 | ||
357 | case EM_AARCH64: | |
358 | plt_header_size = 32; | |
359 | plt_entry_size = 16; | |
360 | break; | |
361 | ||
d6afa561 DM |
362 | case EM_SPARC: |
363 | plt_header_size = 48; | |
364 | plt_entry_size = 12; | |
365 | break; | |
366 | ||
367 | case EM_SPARCV9: | |
368 | plt_header_size = 128; | |
369 | plt_entry_size = 32; | |
370 | break; | |
371 | ||
372 | default: /* FIXME: s390/alpha/mips/parisc/poperpc/sh/xtensa need to be checked */ | |
b2f76050 LB |
373 | plt_header_size = shdr_plt.sh_entsize; |
374 | plt_entry_size = shdr_plt.sh_entsize; | |
375 | break; | |
376 | } | |
377 | plt_offset += plt_header_size; | |
e5a1845f NK |
378 | |
379 | if (shdr_rel_plt.sh_type == SHT_RELA) { | |
380 | GElf_Rela pos_mem, *pos; | |
381 | ||
382 | elf_section__for_each_rela(reldata, pos, pos_mem, idx, | |
383 | nr_rel_entries) { | |
2a8d41b4 MW |
384 | const char *elf_name = NULL; |
385 | char *demangled = NULL; | |
e5a1845f | 386 | symidx = GELF_R_SYM(pos->r_info); |
e5a1845f | 387 | gelf_getsym(syms, symidx, &sym); |
2a8d41b4 MW |
388 | |
389 | elf_name = elf_sym__name(&sym, symstrs); | |
390 | demangled = demangle_sym(dso, 0, elf_name); | |
391 | if (demangled != NULL) | |
392 | elf_name = demangled; | |
e5a1845f | 393 | snprintf(sympltname, sizeof(sympltname), |
2a8d41b4 MW |
394 | "%s@plt", elf_name); |
395 | free(demangled); | |
e5a1845f | 396 | |
b2f76050 | 397 | f = symbol__new(plt_offset, plt_entry_size, |
af30bffa | 398 | STB_GLOBAL, STT_FUNC, sympltname); |
e5a1845f NK |
399 | if (!f) |
400 | goto out_elf_end; | |
401 | ||
b2f76050 | 402 | plt_offset += plt_entry_size; |
3183f8ca | 403 | symbols__insert(&dso->symbols, f); |
be39db9f | 404 | ++nr; |
e5a1845f NK |
405 | } |
406 | } else if (shdr_rel_plt.sh_type == SHT_REL) { | |
407 | GElf_Rel pos_mem, *pos; | |
408 | elf_section__for_each_rel(reldata, pos, pos_mem, idx, | |
409 | nr_rel_entries) { | |
2a8d41b4 MW |
410 | const char *elf_name = NULL; |
411 | char *demangled = NULL; | |
e5a1845f | 412 | symidx = GELF_R_SYM(pos->r_info); |
e5a1845f | 413 | gelf_getsym(syms, symidx, &sym); |
2a8d41b4 MW |
414 | |
415 | elf_name = elf_sym__name(&sym, symstrs); | |
416 | demangled = demangle_sym(dso, 0, elf_name); | |
417 | if (demangled != NULL) | |
418 | elf_name = demangled; | |
e5a1845f | 419 | snprintf(sympltname, sizeof(sympltname), |
2a8d41b4 MW |
420 | "%s@plt", elf_name); |
421 | free(demangled); | |
e5a1845f | 422 | |
b2f76050 | 423 | f = symbol__new(plt_offset, plt_entry_size, |
af30bffa | 424 | STB_GLOBAL, STT_FUNC, sympltname); |
e5a1845f NK |
425 | if (!f) |
426 | goto out_elf_end; | |
427 | ||
b2f76050 | 428 | plt_offset += plt_entry_size; |
3183f8ca | 429 | symbols__insert(&dso->symbols, f); |
be39db9f | 430 | ++nr; |
e5a1845f NK |
431 | } |
432 | } | |
433 | ||
434 | err = 0; | |
435 | out_elf_end: | |
e5a1845f NK |
436 | if (err == 0) |
437 | return nr; | |
e5a1845f NK |
438 | pr_debug("%s: problems reading %s PLT info.\n", |
439 | __func__, dso->long_name); | |
440 | return 0; | |
441 | } | |
442 | ||
80c345b2 | 443 | char *dso__demangle_sym(struct dso *dso, int kmodule, const char *elf_name) |
a64489c5 JY |
444 | { |
445 | return demangle_sym(dso, kmodule, elf_name); | |
446 | } | |
447 | ||
e5a1845f NK |
448 | /* |
449 | * Align offset to 4 bytes as needed for note name and descriptor data. | |
450 | */ | |
451 | #define NOTE_ALIGN(n) (((n) + 3) & -4U) | |
452 | ||
453 | static int elf_read_build_id(Elf *elf, void *bf, size_t size) | |
454 | { | |
455 | int err = -1; | |
456 | GElf_Ehdr ehdr; | |
457 | GElf_Shdr shdr; | |
458 | Elf_Data *data; | |
459 | Elf_Scn *sec; | |
460 | Elf_Kind ek; | |
461 | void *ptr; | |
462 | ||
463 | if (size < BUILD_ID_SIZE) | |
464 | goto out; | |
465 | ||
466 | ek = elf_kind(elf); | |
467 | if (ek != ELF_K_ELF) | |
468 | goto out; | |
469 | ||
470 | if (gelf_getehdr(elf, &ehdr) == NULL) { | |
471 | pr_err("%s: cannot get elf header.\n", __func__); | |
472 | goto out; | |
473 | } | |
474 | ||
475 | /* | |
476 | * Check following sections for notes: | |
477 | * '.note.gnu.build-id' | |
478 | * '.notes' | |
479 | * '.note' (VDSO specific) | |
480 | */ | |
481 | do { | |
482 | sec = elf_section_by_name(elf, &ehdr, &shdr, | |
483 | ".note.gnu.build-id", NULL); | |
484 | if (sec) | |
485 | break; | |
486 | ||
487 | sec = elf_section_by_name(elf, &ehdr, &shdr, | |
488 | ".notes", NULL); | |
489 | if (sec) | |
490 | break; | |
491 | ||
492 | sec = elf_section_by_name(elf, &ehdr, &shdr, | |
493 | ".note", NULL); | |
494 | if (sec) | |
495 | break; | |
496 | ||
497 | return err; | |
498 | ||
499 | } while (0); | |
500 | ||
501 | data = elf_getdata(sec, NULL); | |
502 | if (data == NULL) | |
503 | goto out; | |
504 | ||
505 | ptr = data->d_buf; | |
506 | while (ptr < (data->d_buf + data->d_size)) { | |
507 | GElf_Nhdr *nhdr = ptr; | |
508 | size_t namesz = NOTE_ALIGN(nhdr->n_namesz), | |
509 | descsz = NOTE_ALIGN(nhdr->n_descsz); | |
510 | const char *name; | |
511 | ||
512 | ptr += sizeof(*nhdr); | |
513 | name = ptr; | |
514 | ptr += namesz; | |
515 | if (nhdr->n_type == NT_GNU_BUILD_ID && | |
516 | nhdr->n_namesz == sizeof("GNU")) { | |
517 | if (memcmp(name, "GNU", sizeof("GNU")) == 0) { | |
518 | size_t sz = min(size, descsz); | |
519 | memcpy(bf, ptr, sz); | |
520 | memset(bf + sz, 0, size - sz); | |
521 | err = descsz; | |
522 | break; | |
523 | } | |
524 | } | |
525 | ptr += descsz; | |
526 | } | |
527 | ||
528 | out: | |
529 | return err; | |
530 | } | |
531 | ||
532 | int filename__read_build_id(const char *filename, void *bf, size_t size) | |
533 | { | |
534 | int fd, err = -1; | |
535 | Elf *elf; | |
536 | ||
537 | if (size < BUILD_ID_SIZE) | |
538 | goto out; | |
539 | ||
540 | fd = open(filename, O_RDONLY); | |
541 | if (fd < 0) | |
542 | goto out; | |
543 | ||
544 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
545 | if (elf == NULL) { | |
546 | pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename); | |
547 | goto out_close; | |
548 | } | |
549 | ||
550 | err = elf_read_build_id(elf, bf, size); | |
551 | ||
552 | elf_end(elf); | |
553 | out_close: | |
554 | close(fd); | |
555 | out: | |
556 | return err; | |
557 | } | |
558 | ||
559 | int sysfs__read_build_id(const char *filename, void *build_id, size_t size) | |
560 | { | |
561 | int fd, err = -1; | |
562 | ||
563 | if (size < BUILD_ID_SIZE) | |
564 | goto out; | |
565 | ||
566 | fd = open(filename, O_RDONLY); | |
567 | if (fd < 0) | |
568 | goto out; | |
569 | ||
570 | while (1) { | |
571 | char bf[BUFSIZ]; | |
572 | GElf_Nhdr nhdr; | |
573 | size_t namesz, descsz; | |
574 | ||
575 | if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr)) | |
576 | break; | |
577 | ||
578 | namesz = NOTE_ALIGN(nhdr.n_namesz); | |
579 | descsz = NOTE_ALIGN(nhdr.n_descsz); | |
580 | if (nhdr.n_type == NT_GNU_BUILD_ID && | |
581 | nhdr.n_namesz == sizeof("GNU")) { | |
582 | if (read(fd, bf, namesz) != (ssize_t)namesz) | |
583 | break; | |
584 | if (memcmp(bf, "GNU", sizeof("GNU")) == 0) { | |
585 | size_t sz = min(descsz, size); | |
586 | if (read(fd, build_id, sz) == (ssize_t)sz) { | |
587 | memset(build_id + sz, 0, size - sz); | |
588 | err = 0; | |
589 | break; | |
590 | } | |
591 | } else if (read(fd, bf, descsz) != (ssize_t)descsz) | |
592 | break; | |
593 | } else { | |
594 | int n = namesz + descsz; | |
7934c98a ACM |
595 | |
596 | if (n > (int)sizeof(bf)) { | |
597 | n = sizeof(bf); | |
598 | pr_debug("%s: truncating reading of build id in sysfs file %s: n_namesz=%u, n_descsz=%u.\n", | |
599 | __func__, filename, nhdr.n_namesz, nhdr.n_descsz); | |
600 | } | |
e5a1845f NK |
601 | if (read(fd, bf, n) != n) |
602 | break; | |
603 | } | |
604 | } | |
605 | close(fd); | |
606 | out: | |
607 | return err; | |
608 | } | |
609 | ||
610 | int filename__read_debuglink(const char *filename, char *debuglink, | |
611 | size_t size) | |
612 | { | |
613 | int fd, err = -1; | |
614 | Elf *elf; | |
615 | GElf_Ehdr ehdr; | |
616 | GElf_Shdr shdr; | |
617 | Elf_Data *data; | |
618 | Elf_Scn *sec; | |
619 | Elf_Kind ek; | |
620 | ||
621 | fd = open(filename, O_RDONLY); | |
622 | if (fd < 0) | |
623 | goto out; | |
624 | ||
625 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
626 | if (elf == NULL) { | |
627 | pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename); | |
628 | goto out_close; | |
629 | } | |
630 | ||
631 | ek = elf_kind(elf); | |
632 | if (ek != ELF_K_ELF) | |
784f3390 | 633 | goto out_elf_end; |
e5a1845f NK |
634 | |
635 | if (gelf_getehdr(elf, &ehdr) == NULL) { | |
636 | pr_err("%s: cannot get elf header.\n", __func__); | |
784f3390 | 637 | goto out_elf_end; |
e5a1845f NK |
638 | } |
639 | ||
640 | sec = elf_section_by_name(elf, &ehdr, &shdr, | |
641 | ".gnu_debuglink", NULL); | |
642 | if (sec == NULL) | |
784f3390 | 643 | goto out_elf_end; |
e5a1845f NK |
644 | |
645 | data = elf_getdata(sec, NULL); | |
646 | if (data == NULL) | |
784f3390 | 647 | goto out_elf_end; |
e5a1845f NK |
648 | |
649 | /* the start of this section is a zero-terminated string */ | |
650 | strncpy(debuglink, data->d_buf, size); | |
651 | ||
0d3dc5e8 SE |
652 | err = 0; |
653 | ||
784f3390 | 654 | out_elf_end: |
e5a1845f | 655 | elf_end(elf); |
e5a1845f NK |
656 | out_close: |
657 | close(fd); | |
658 | out: | |
659 | return err; | |
660 | } | |
661 | ||
662 | static int dso__swap_init(struct dso *dso, unsigned char eidata) | |
663 | { | |
664 | static unsigned int const endian = 1; | |
665 | ||
666 | dso->needs_swap = DSO_SWAP__NO; | |
667 | ||
668 | switch (eidata) { | |
669 | case ELFDATA2LSB: | |
670 | /* We are big endian, DSO is little endian. */ | |
671 | if (*(unsigned char const *)&endian != 1) | |
672 | dso->needs_swap = DSO_SWAP__YES; | |
673 | break; | |
674 | ||
675 | case ELFDATA2MSB: | |
676 | /* We are little endian, DSO is big endian. */ | |
677 | if (*(unsigned char const *)&endian != 0) | |
678 | dso->needs_swap = DSO_SWAP__YES; | |
679 | break; | |
680 | ||
681 | default: | |
682 | pr_err("unrecognized DSO data encoding %d\n", eidata); | |
683 | return -EINVAL; | |
684 | } | |
685 | ||
686 | return 0; | |
687 | } | |
688 | ||
3aafe5ae CS |
689 | bool symsrc__possibly_runtime(struct symsrc *ss) |
690 | { | |
691 | return ss->dynsym || ss->opdsec; | |
692 | } | |
693 | ||
d26cd12b CS |
694 | bool symsrc__has_symtab(struct symsrc *ss) |
695 | { | |
696 | return ss->symtab != NULL; | |
697 | } | |
b68e2f91 CS |
698 | |
699 | void symsrc__destroy(struct symsrc *ss) | |
700 | { | |
74cf249d | 701 | zfree(&ss->name); |
b68e2f91 CS |
702 | elf_end(ss->elf); |
703 | close(ss->fd); | |
704 | } | |
705 | ||
d2332098 NR |
706 | bool __weak elf__needs_adjust_symbols(GElf_Ehdr ehdr) |
707 | { | |
708 | return ehdr.e_type == ET_EXEC || ehdr.e_type == ET_REL; | |
709 | } | |
710 | ||
b68e2f91 CS |
711 | int symsrc__init(struct symsrc *ss, struct dso *dso, const char *name, |
712 | enum dso_binary_type type) | |
e5a1845f | 713 | { |
e5a1845f | 714 | GElf_Ehdr ehdr; |
e5a1845f | 715 | Elf *elf; |
b68e2f91 CS |
716 | int fd; |
717 | ||
18425f13 | 718 | if (dso__needs_decompress(dso)) { |
42b3fa67 | 719 | fd = dso__decompress_kmodule_fd(dso, name); |
18425f13 ACM |
720 | if (fd < 0) |
721 | return -1; | |
c25ec42f NK |
722 | |
723 | type = dso->symtab_type; | |
18425f13 | 724 | } else { |
c00c48fc | 725 | fd = open(name, O_RDONLY); |
18425f13 ACM |
726 | if (fd < 0) { |
727 | dso->load_errno = errno; | |
728 | return -1; | |
729 | } | |
730 | } | |
e5a1845f NK |
731 | |
732 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
733 | if (elf == NULL) { | |
734 | pr_debug("%s: cannot read %s ELF file.\n", __func__, name); | |
18425f13 | 735 | dso->load_errno = DSO_LOAD_ERRNO__INVALID_ELF; |
e5a1845f NK |
736 | goto out_close; |
737 | } | |
738 | ||
739 | if (gelf_getehdr(elf, &ehdr) == NULL) { | |
18425f13 | 740 | dso->load_errno = DSO_LOAD_ERRNO__INVALID_ELF; |
e5a1845f NK |
741 | pr_debug("%s: cannot get elf header.\n", __func__); |
742 | goto out_elf_end; | |
743 | } | |
744 | ||
18425f13 ACM |
745 | if (dso__swap_init(dso, ehdr.e_ident[EI_DATA])) { |
746 | dso->load_errno = DSO_LOAD_ERRNO__INTERNAL_ERROR; | |
e5a1845f | 747 | goto out_elf_end; |
18425f13 | 748 | } |
e5a1845f NK |
749 | |
750 | /* Always reject images with a mismatched build-id: */ | |
428aff82 | 751 | if (dso->has_build_id && !symbol_conf.ignore_vmlinux_buildid) { |
e5a1845f NK |
752 | u8 build_id[BUILD_ID_SIZE]; |
753 | ||
18425f13 ACM |
754 | if (elf_read_build_id(elf, build_id, BUILD_ID_SIZE) < 0) { |
755 | dso->load_errno = DSO_LOAD_ERRNO__CANNOT_READ_BUILDID; | |
e5a1845f | 756 | goto out_elf_end; |
18425f13 | 757 | } |
e5a1845f | 758 | |
18425f13 | 759 | if (!dso__build_id_equal(dso, build_id)) { |
468f3d29 | 760 | pr_debug("%s: build id mismatch for %s.\n", __func__, name); |
18425f13 | 761 | dso->load_errno = DSO_LOAD_ERRNO__MISMATCHING_BUILDID; |
e5a1845f | 762 | goto out_elf_end; |
18425f13 | 763 | } |
e5a1845f NK |
764 | } |
765 | ||
c6d8f2a4 AH |
766 | ss->is_64_bit = (gelf_getclass(elf) == ELFCLASS64); |
767 | ||
b68e2f91 CS |
768 | ss->symtab = elf_section_by_name(elf, &ehdr, &ss->symshdr, ".symtab", |
769 | NULL); | |
770 | if (ss->symshdr.sh_type != SHT_SYMTAB) | |
771 | ss->symtab = NULL; | |
772 | ||
773 | ss->dynsym_idx = 0; | |
774 | ss->dynsym = elf_section_by_name(elf, &ehdr, &ss->dynshdr, ".dynsym", | |
775 | &ss->dynsym_idx); | |
776 | if (ss->dynshdr.sh_type != SHT_DYNSYM) | |
777 | ss->dynsym = NULL; | |
778 | ||
779 | ss->opdidx = 0; | |
780 | ss->opdsec = elf_section_by_name(elf, &ehdr, &ss->opdshdr, ".opd", | |
781 | &ss->opdidx); | |
782 | if (ss->opdshdr.sh_type != SHT_PROGBITS) | |
783 | ss->opdsec = NULL; | |
784 | ||
99e87f7b WN |
785 | if (dso->kernel == DSO_TYPE_USER) |
786 | ss->adjust_symbols = true; | |
787 | else | |
d2332098 | 788 | ss->adjust_symbols = elf__needs_adjust_symbols(ehdr); |
b68e2f91 CS |
789 | |
790 | ss->name = strdup(name); | |
18425f13 ACM |
791 | if (!ss->name) { |
792 | dso->load_errno = errno; | |
b68e2f91 | 793 | goto out_elf_end; |
18425f13 | 794 | } |
b68e2f91 CS |
795 | |
796 | ss->elf = elf; | |
797 | ss->fd = fd; | |
798 | ss->ehdr = ehdr; | |
799 | ss->type = type; | |
800 | ||
801 | return 0; | |
802 | ||
803 | out_elf_end: | |
804 | elf_end(elf); | |
805 | out_close: | |
806 | close(fd); | |
e5f177a5 | 807 | return -1; |
b68e2f91 CS |
808 | } |
809 | ||
39b12f78 AH |
810 | /** |
811 | * ref_reloc_sym_not_found - has kernel relocation symbol been found. | |
812 | * @kmap: kernel maps and relocation reference symbol | |
813 | * | |
814 | * This function returns %true if we are dealing with the kernel maps and the | |
815 | * relocation reference symbol has not yet been found. Otherwise %false is | |
816 | * returned. | |
817 | */ | |
818 | static bool ref_reloc_sym_not_found(struct kmap *kmap) | |
819 | { | |
820 | return kmap && kmap->ref_reloc_sym && kmap->ref_reloc_sym->name && | |
821 | !kmap->ref_reloc_sym->unrelocated_addr; | |
822 | } | |
823 | ||
824 | /** | |
825 | * ref_reloc - kernel relocation offset. | |
826 | * @kmap: kernel maps and relocation reference symbol | |
827 | * | |
828 | * This function returns the offset of kernel addresses as determined by using | |
829 | * the relocation reference symbol i.e. if the kernel has not been relocated | |
830 | * then the return value is zero. | |
831 | */ | |
832 | static u64 ref_reloc(struct kmap *kmap) | |
833 | { | |
834 | if (kmap && kmap->ref_reloc_sym && | |
835 | kmap->ref_reloc_sym->unrelocated_addr) | |
836 | return kmap->ref_reloc_sym->addr - | |
837 | kmap->ref_reloc_sym->unrelocated_addr; | |
838 | return 0; | |
839 | } | |
840 | ||
0b3c2264 NR |
841 | void __weak arch__sym_update(struct symbol *s __maybe_unused, |
842 | GElf_Sym *sym __maybe_unused) { } | |
c50fc0a4 | 843 | |
4e0d1e8b ACM |
844 | static int dso__process_kernel_symbol(struct dso *dso, struct map *map, |
845 | GElf_Sym *sym, GElf_Shdr *shdr, | |
846 | struct map_groups *kmaps, struct kmap *kmap, | |
847 | struct dso **curr_dsop, struct map **curr_mapp, | |
848 | const char *section_name, | |
849 | bool adjust_kernel_syms, bool kmodule, bool *remap_kernel) | |
850 | { | |
851 | struct dso *curr_dso = *curr_dsop; | |
852 | struct map *curr_map; | |
853 | char dso_name[PATH_MAX]; | |
854 | ||
855 | /* Adjust symbol to map to file offset */ | |
856 | if (adjust_kernel_syms) | |
857 | sym->st_value -= shdr->sh_addr - shdr->sh_offset; | |
858 | ||
859 | if (strcmp(section_name, (curr_dso->short_name + dso->short_name_len)) == 0) | |
860 | return 0; | |
861 | ||
862 | if (strcmp(section_name, ".text") == 0) { | |
863 | /* | |
864 | * The initial kernel mapping is based on | |
865 | * kallsyms and identity maps. Overwrite it to | |
866 | * map to the kernel dso. | |
867 | */ | |
868 | if (*remap_kernel && dso->kernel) { | |
869 | *remap_kernel = false; | |
870 | map->start = shdr->sh_addr + ref_reloc(kmap); | |
871 | map->end = map->start + shdr->sh_size; | |
872 | map->pgoff = shdr->sh_offset; | |
873 | map->map_ip = map__map_ip; | |
874 | map->unmap_ip = map__unmap_ip; | |
875 | /* Ensure maps are correctly ordered */ | |
876 | if (kmaps) { | |
877 | map__get(map); | |
878 | map_groups__remove(kmaps, map); | |
879 | map_groups__insert(kmaps, map); | |
880 | map__put(map); | |
881 | } | |
882 | } | |
883 | ||
884 | /* | |
885 | * The initial module mapping is based on | |
886 | * /proc/modules mapped to offset zero. | |
887 | * Overwrite it to map to the module dso. | |
888 | */ | |
889 | if (*remap_kernel && kmodule) { | |
890 | *remap_kernel = false; | |
891 | map->pgoff = shdr->sh_offset; | |
892 | } | |
893 | ||
894 | *curr_mapp = map; | |
895 | *curr_dsop = dso; | |
896 | return 0; | |
897 | } | |
898 | ||
899 | if (!kmap) | |
900 | return 0; | |
901 | ||
902 | snprintf(dso_name, sizeof(dso_name), "%s%s", dso->short_name, section_name); | |
903 | ||
904 | curr_map = map_groups__find_by_name(kmaps, dso_name); | |
905 | if (curr_map == NULL) { | |
906 | u64 start = sym->st_value; | |
907 | ||
908 | if (kmodule) | |
909 | start += map->start + shdr->sh_offset; | |
910 | ||
911 | curr_dso = dso__new(dso_name); | |
912 | if (curr_dso == NULL) | |
913 | return -1; | |
914 | curr_dso->kernel = dso->kernel; | |
915 | curr_dso->long_name = dso->long_name; | |
916 | curr_dso->long_name_len = dso->long_name_len; | |
917 | curr_map = map__new2(start, curr_dso); | |
918 | dso__put(curr_dso); | |
919 | if (curr_map == NULL) | |
920 | return -1; | |
921 | ||
922 | if (adjust_kernel_syms) { | |
923 | curr_map->start = shdr->sh_addr + ref_reloc(kmap); | |
924 | curr_map->end = curr_map->start + shdr->sh_size; | |
925 | curr_map->pgoff = shdr->sh_offset; | |
926 | } else { | |
927 | curr_map->map_ip = curr_map->unmap_ip = identity__map_ip; | |
928 | } | |
929 | curr_dso->symtab_type = dso->symtab_type; | |
930 | map_groups__insert(kmaps, curr_map); | |
931 | /* | |
932 | * Add it before we drop the referece to curr_map, i.e. while | |
933 | * we still are sure to have a reference to this DSO via | |
934 | * *curr_map->dso. | |
935 | */ | |
936 | dsos__add(&map->groups->machine->dsos, curr_dso); | |
937 | /* kmaps already got it */ | |
938 | map__put(curr_map); | |
939 | dso__set_loaded(curr_dso); | |
940 | *curr_mapp = curr_map; | |
941 | *curr_dsop = curr_dso; | |
942 | } else | |
943 | *curr_dsop = curr_map->dso; | |
944 | ||
945 | return 0; | |
946 | } | |
947 | ||
be39db9f ACM |
948 | int dso__load_sym(struct dso *dso, struct map *map, struct symsrc *syms_ss, |
949 | struct symsrc *runtime_ss, int kmodule) | |
b68e2f91 CS |
950 | { |
951 | struct kmap *kmap = dso->kernel ? map__kmap(map) : NULL; | |
ba92732e | 952 | struct map_groups *kmaps = kmap ? map__kmaps(map) : NULL; |
b68e2f91 CS |
953 | struct map *curr_map = map; |
954 | struct dso *curr_dso = dso; | |
955 | Elf_Data *symstrs, *secstrs; | |
956 | uint32_t nr_syms; | |
957 | int err = -1; | |
958 | uint32_t idx; | |
959 | GElf_Ehdr ehdr; | |
261360b6 | 960 | GElf_Shdr shdr; |
73cdf0c6 | 961 | GElf_Shdr tshdr; |
b68e2f91 CS |
962 | Elf_Data *syms, *opddata = NULL; |
963 | GElf_Sym sym; | |
261360b6 | 964 | Elf_Scn *sec, *sec_strndx; |
b68e2f91 CS |
965 | Elf *elf; |
966 | int nr = 0; | |
39b12f78 | 967 | bool remap_kernel = false, adjust_kernel_syms = false; |
b68e2f91 | 968 | |
ba92732e WN |
969 | if (kmap && !kmaps) |
970 | return -1; | |
971 | ||
261360b6 | 972 | dso->symtab_type = syms_ss->type; |
c6d8f2a4 | 973 | dso->is_64_bit = syms_ss->is_64_bit; |
0131c4ec AH |
974 | dso->rel = syms_ss->ehdr.e_type == ET_REL; |
975 | ||
976 | /* | |
977 | * Modules may already have symbols from kallsyms, but those symbols | |
978 | * have the wrong values for the dso maps, so remove them. | |
979 | */ | |
980 | if (kmodule && syms_ss->symtab) | |
3183f8ca | 981 | symbols__delete(&dso->symbols); |
005f9294 | 982 | |
261360b6 | 983 | if (!syms_ss->symtab) { |
d0b0d040 AB |
984 | /* |
985 | * If the vmlinux is stripped, fail so we will fall back | |
986 | * to using kallsyms. The vmlinux runtime symbols aren't | |
987 | * of much use. | |
988 | */ | |
989 | if (dso->kernel) | |
990 | goto out_elf_end; | |
991 | ||
261360b6 CS |
992 | syms_ss->symtab = syms_ss->dynsym; |
993 | syms_ss->symshdr = syms_ss->dynshdr; | |
d26cd12b CS |
994 | } |
995 | ||
261360b6 CS |
996 | elf = syms_ss->elf; |
997 | ehdr = syms_ss->ehdr; | |
998 | sec = syms_ss->symtab; | |
999 | shdr = syms_ss->symshdr; | |
b68e2f91 | 1000 | |
50de1a0c AB |
1001 | if (elf_section_by_name(runtime_ss->elf, &runtime_ss->ehdr, &tshdr, |
1002 | ".text", NULL)) | |
73cdf0c6 WN |
1003 | dso->text_offset = tshdr.sh_addr - tshdr.sh_offset; |
1004 | ||
261360b6 CS |
1005 | if (runtime_ss->opdsec) |
1006 | opddata = elf_rawdata(runtime_ss->opdsec, NULL); | |
e5a1845f NK |
1007 | |
1008 | syms = elf_getdata(sec, NULL); | |
1009 | if (syms == NULL) | |
1010 | goto out_elf_end; | |
1011 | ||
1012 | sec = elf_getscn(elf, shdr.sh_link); | |
1013 | if (sec == NULL) | |
1014 | goto out_elf_end; | |
1015 | ||
1016 | symstrs = elf_getdata(sec, NULL); | |
1017 | if (symstrs == NULL) | |
1018 | goto out_elf_end; | |
1019 | ||
f247fb81 | 1020 | sec_strndx = elf_getscn(runtime_ss->elf, runtime_ss->ehdr.e_shstrndx); |
e5a1845f NK |
1021 | if (sec_strndx == NULL) |
1022 | goto out_elf_end; | |
1023 | ||
1024 | secstrs = elf_getdata(sec_strndx, NULL); | |
1025 | if (secstrs == NULL) | |
1026 | goto out_elf_end; | |
1027 | ||
1028 | nr_syms = shdr.sh_size / shdr.sh_entsize; | |
1029 | ||
1030 | memset(&sym, 0, sizeof(sym)); | |
39b12f78 AH |
1031 | |
1032 | /* | |
1033 | * The kernel relocation symbol is needed in advance in order to adjust | |
1034 | * kernel maps correctly. | |
1035 | */ | |
1036 | if (ref_reloc_sym_not_found(kmap)) { | |
1037 | elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) { | |
1038 | const char *elf_name = elf_sym__name(&sym, symstrs); | |
1039 | ||
1040 | if (strcmp(elf_name, kmap->ref_reloc_sym->name)) | |
1041 | continue; | |
1042 | kmap->ref_reloc_sym->unrelocated_addr = sym.st_value; | |
9176753d AH |
1043 | map->reloc = kmap->ref_reloc_sym->addr - |
1044 | kmap->ref_reloc_sym->unrelocated_addr; | |
39b12f78 AH |
1045 | break; |
1046 | } | |
1047 | } | |
1048 | ||
f0ee3b46 AH |
1049 | /* |
1050 | * Handle any relocation of vdso necessary because older kernels | |
1051 | * attempted to prelink vdso to its virtual address. | |
1052 | */ | |
73cdf0c6 WN |
1053 | if (dso__is_vdso(dso)) |
1054 | map->reloc = map->start - dso->text_offset; | |
f0ee3b46 | 1055 | |
39b12f78 AH |
1056 | dso->adjust_symbols = runtime_ss->adjust_symbols || ref_reloc(kmap); |
1057 | /* | |
d1fd8d9e ACM |
1058 | * Initial kernel and module mappings do not map to the dso. |
1059 | * Flag the fixups. | |
39b12f78 | 1060 | */ |
d1fd8d9e | 1061 | if (dso->kernel || kmodule) { |
39b12f78 AH |
1062 | remap_kernel = true; |
1063 | adjust_kernel_syms = dso->adjust_symbols; | |
1064 | } | |
e5a1845f NK |
1065 | elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) { |
1066 | struct symbol *f; | |
1067 | const char *elf_name = elf_sym__name(&sym, symstrs); | |
1068 | char *demangled = NULL; | |
1069 | int is_label = elf_sym__is_label(&sym); | |
1070 | const char *section_name; | |
261360b6 | 1071 | bool used_opd = false; |
e5a1845f | 1072 | |
3183f8ca | 1073 | if (!is_label && !elf_sym__filter(&sym)) |
e5a1845f NK |
1074 | continue; |
1075 | ||
1076 | /* Reject ARM ELF "mapping symbols": these aren't unique and | |
1077 | * don't identify functions, so will confuse the profile | |
1078 | * output: */ | |
4886f2ca VK |
1079 | if (ehdr.e_machine == EM_ARM || ehdr.e_machine == EM_AARCH64) { |
1080 | if (elf_name[0] == '$' && strchr("adtx", elf_name[1]) | |
1081 | && (elf_name[2] == '\0' || elf_name[2] == '.')) | |
e5a1845f NK |
1082 | continue; |
1083 | } | |
1084 | ||
261360b6 CS |
1085 | if (runtime_ss->opdsec && sym.st_shndx == runtime_ss->opdidx) { |
1086 | u32 offset = sym.st_value - syms_ss->opdshdr.sh_addr; | |
e5a1845f NK |
1087 | u64 *opd = opddata->d_buf + offset; |
1088 | sym.st_value = DSO__SWAP(dso, u64, *opd); | |
261360b6 CS |
1089 | sym.st_shndx = elf_addr_to_index(runtime_ss->elf, |
1090 | sym.st_value); | |
1091 | used_opd = true; | |
e5a1845f | 1092 | } |
3843b05d NK |
1093 | /* |
1094 | * When loading symbols in a data mapping, ABS symbols (which | |
1095 | * has a value of SHN_ABS in its st_shndx) failed at | |
1096 | * elf_getscn(). And it marks the loading as a failure so | |
1097 | * already loaded symbols cannot be fixed up. | |
1098 | * | |
1099 | * I'm not sure what should be done. Just ignore them for now. | |
1100 | * - Namhyung Kim | |
1101 | */ | |
1102 | if (sym.st_shndx == SHN_ABS) | |
1103 | continue; | |
e5a1845f | 1104 | |
261360b6 | 1105 | sec = elf_getscn(runtime_ss->elf, sym.st_shndx); |
e5a1845f NK |
1106 | if (!sec) |
1107 | goto out_elf_end; | |
1108 | ||
1109 | gelf_getshdr(sec, &shdr); | |
1110 | ||
3183f8ca | 1111 | if (is_label && !elf_sec__filter(&shdr, secstrs)) |
e5a1845f NK |
1112 | continue; |
1113 | ||
1114 | section_name = elf_sec__name(&shdr, secstrs); | |
1115 | ||
1116 | /* On ARM, symbols for thumb functions have 1 added to | |
1117 | * the symbol address as a flag - remove it */ | |
1118 | if ((ehdr.e_machine == EM_ARM) && | |
18231d79 | 1119 | (GELF_ST_TYPE(sym.st_info) == STT_FUNC) && |
e5a1845f NK |
1120 | (sym.st_value & 1)) |
1121 | --sym.st_value; | |
1122 | ||
39b12f78 | 1123 | if (dso->kernel || kmodule) { |
4e0d1e8b ACM |
1124 | if (dso__process_kernel_symbol(dso, map, &sym, &shdr, kmaps, kmap, &curr_dso, &curr_map, |
1125 | section_name, adjust_kernel_syms, kmodule, &remap_kernel)) | |
1126 | goto out_elf_end; | |
857140e8 ACM |
1127 | } else if ((used_opd && runtime_ss->adjust_symbols) || |
1128 | (!used_opd && syms_ss->adjust_symbols)) { | |
e5a1845f NK |
1129 | pr_debug4("%s: adjusting symbol: st_value: %#" PRIx64 " " |
1130 | "sh_addr: %#" PRIx64 " sh_offset: %#" PRIx64 "\n", __func__, | |
1131 | (u64)sym.st_value, (u64)shdr.sh_addr, | |
1132 | (u64)shdr.sh_offset); | |
1133 | sym.st_value -= shdr.sh_addr - shdr.sh_offset; | |
1134 | } | |
4e0d1e8b | 1135 | |
2a8d41b4 MW |
1136 | demangled = demangle_sym(dso, kmodule, elf_name); |
1137 | if (demangled != NULL) | |
1138 | elf_name = demangled; | |
cae15db7 | 1139 | |
e5a1845f | 1140 | f = symbol__new(sym.st_value, sym.st_size, |
af30bffa ACM |
1141 | GELF_ST_BIND(sym.st_info), |
1142 | GELF_ST_TYPE(sym.st_info), elf_name); | |
e5a1845f NK |
1143 | free(demangled); |
1144 | if (!f) | |
1145 | goto out_elf_end; | |
1146 | ||
0b3c2264 NR |
1147 | arch__sym_update(f, &sym); |
1148 | ||
3183f8ca | 1149 | __symbols__insert(&curr_dso->symbols, f, dso->kernel); |
be39db9f | 1150 | nr++; |
e5a1845f NK |
1151 | } |
1152 | ||
1153 | /* | |
1154 | * For misannotated, zeroed, ASM function sizes. | |
1155 | */ | |
1156 | if (nr > 0) { | |
3183f8ca ACM |
1157 | symbols__fixup_end(&dso->symbols); |
1158 | symbols__fixup_duplicate(&dso->symbols); | |
e5a1845f NK |
1159 | if (kmap) { |
1160 | /* | |
1161 | * We need to fixup this here too because we create new | |
1162 | * maps here, for things like vsyscall sections. | |
1163 | */ | |
3183f8ca | 1164 | map_groups__fixup_end(kmaps); |
e5a1845f NK |
1165 | } |
1166 | } | |
1167 | err = nr; | |
1168 | out_elf_end: | |
e5a1845f NK |
1169 | return err; |
1170 | } | |
1171 | ||
8e0cf965 AH |
1172 | static int elf_read_maps(Elf *elf, bool exe, mapfn_t mapfn, void *data) |
1173 | { | |
1174 | GElf_Phdr phdr; | |
1175 | size_t i, phdrnum; | |
1176 | int err; | |
1177 | u64 sz; | |
1178 | ||
1179 | if (elf_getphdrnum(elf, &phdrnum)) | |
1180 | return -1; | |
1181 | ||
1182 | for (i = 0; i < phdrnum; i++) { | |
1183 | if (gelf_getphdr(elf, i, &phdr) == NULL) | |
1184 | return -1; | |
1185 | if (phdr.p_type != PT_LOAD) | |
1186 | continue; | |
1187 | if (exe) { | |
1188 | if (!(phdr.p_flags & PF_X)) | |
1189 | continue; | |
1190 | } else { | |
1191 | if (!(phdr.p_flags & PF_R)) | |
1192 | continue; | |
1193 | } | |
1194 | sz = min(phdr.p_memsz, phdr.p_filesz); | |
1195 | if (!sz) | |
1196 | continue; | |
1197 | err = mapfn(phdr.p_vaddr, sz, phdr.p_offset, data); | |
1198 | if (err) | |
1199 | return err; | |
1200 | } | |
1201 | return 0; | |
1202 | } | |
1203 | ||
1204 | int file__read_maps(int fd, bool exe, mapfn_t mapfn, void *data, | |
1205 | bool *is_64_bit) | |
1206 | { | |
1207 | int err; | |
1208 | Elf *elf; | |
1209 | ||
1210 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
1211 | if (elf == NULL) | |
1212 | return -1; | |
1213 | ||
1214 | if (is_64_bit) | |
1215 | *is_64_bit = (gelf_getclass(elf) == ELFCLASS64); | |
1216 | ||
1217 | err = elf_read_maps(elf, exe, mapfn, data); | |
1218 | ||
1219 | elf_end(elf); | |
1220 | return err; | |
1221 | } | |
1222 | ||
2b5b8bb2 AH |
1223 | enum dso_type dso__type_fd(int fd) |
1224 | { | |
1225 | enum dso_type dso_type = DSO__TYPE_UNKNOWN; | |
1226 | GElf_Ehdr ehdr; | |
1227 | Elf_Kind ek; | |
1228 | Elf *elf; | |
1229 | ||
1230 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
1231 | if (elf == NULL) | |
1232 | goto out; | |
1233 | ||
1234 | ek = elf_kind(elf); | |
1235 | if (ek != ELF_K_ELF) | |
1236 | goto out_end; | |
1237 | ||
1238 | if (gelf_getclass(elf) == ELFCLASS64) { | |
1239 | dso_type = DSO__TYPE_64BIT; | |
1240 | goto out_end; | |
1241 | } | |
1242 | ||
1243 | if (gelf_getehdr(elf, &ehdr) == NULL) | |
1244 | goto out_end; | |
1245 | ||
1246 | if (ehdr.e_machine == EM_X86_64) | |
1247 | dso_type = DSO__TYPE_X32BIT; | |
1248 | else | |
1249 | dso_type = DSO__TYPE_32BIT; | |
1250 | out_end: | |
1251 | elf_end(elf); | |
1252 | out: | |
1253 | return dso_type; | |
1254 | } | |
1255 | ||
afba19d9 AH |
1256 | static int copy_bytes(int from, off_t from_offs, int to, off_t to_offs, u64 len) |
1257 | { | |
1258 | ssize_t r; | |
1259 | size_t n; | |
1260 | int err = -1; | |
1261 | char *buf = malloc(page_size); | |
1262 | ||
1263 | if (buf == NULL) | |
1264 | return -1; | |
1265 | ||
1266 | if (lseek(to, to_offs, SEEK_SET) != to_offs) | |
1267 | goto out; | |
1268 | ||
1269 | if (lseek(from, from_offs, SEEK_SET) != from_offs) | |
1270 | goto out; | |
1271 | ||
1272 | while (len) { | |
1273 | n = page_size; | |
1274 | if (len < n) | |
1275 | n = len; | |
1276 | /* Use read because mmap won't work on proc files */ | |
1277 | r = read(from, buf, n); | |
1278 | if (r < 0) | |
1279 | goto out; | |
1280 | if (!r) | |
1281 | break; | |
1282 | n = r; | |
1283 | r = write(to, buf, n); | |
1284 | if (r < 0) | |
1285 | goto out; | |
1286 | if ((size_t)r != n) | |
1287 | goto out; | |
1288 | len -= n; | |
1289 | } | |
1290 | ||
1291 | err = 0; | |
1292 | out: | |
1293 | free(buf); | |
1294 | return err; | |
1295 | } | |
1296 | ||
1297 | struct kcore { | |
1298 | int fd; | |
1299 | int elfclass; | |
1300 | Elf *elf; | |
1301 | GElf_Ehdr ehdr; | |
1302 | }; | |
1303 | ||
1304 | static int kcore__open(struct kcore *kcore, const char *filename) | |
1305 | { | |
1306 | GElf_Ehdr *ehdr; | |
1307 | ||
1308 | kcore->fd = open(filename, O_RDONLY); | |
1309 | if (kcore->fd == -1) | |
1310 | return -1; | |
1311 | ||
1312 | kcore->elf = elf_begin(kcore->fd, ELF_C_READ, NULL); | |
1313 | if (!kcore->elf) | |
1314 | goto out_close; | |
1315 | ||
1316 | kcore->elfclass = gelf_getclass(kcore->elf); | |
1317 | if (kcore->elfclass == ELFCLASSNONE) | |
1318 | goto out_end; | |
1319 | ||
1320 | ehdr = gelf_getehdr(kcore->elf, &kcore->ehdr); | |
1321 | if (!ehdr) | |
1322 | goto out_end; | |
1323 | ||
1324 | return 0; | |
1325 | ||
1326 | out_end: | |
1327 | elf_end(kcore->elf); | |
1328 | out_close: | |
1329 | close(kcore->fd); | |
1330 | return -1; | |
1331 | } | |
1332 | ||
1333 | static int kcore__init(struct kcore *kcore, char *filename, int elfclass, | |
1334 | bool temp) | |
1335 | { | |
afba19d9 AH |
1336 | kcore->elfclass = elfclass; |
1337 | ||
1338 | if (temp) | |
1339 | kcore->fd = mkstemp(filename); | |
1340 | else | |
1341 | kcore->fd = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0400); | |
1342 | if (kcore->fd == -1) | |
1343 | return -1; | |
1344 | ||
1345 | kcore->elf = elf_begin(kcore->fd, ELF_C_WRITE, NULL); | |
1346 | if (!kcore->elf) | |
1347 | goto out_close; | |
1348 | ||
1349 | if (!gelf_newehdr(kcore->elf, elfclass)) | |
1350 | goto out_end; | |
1351 | ||
b5cabbcb | 1352 | memset(&kcore->ehdr, 0, sizeof(GElf_Ehdr)); |
afba19d9 AH |
1353 | |
1354 | return 0; | |
1355 | ||
1356 | out_end: | |
1357 | elf_end(kcore->elf); | |
1358 | out_close: | |
1359 | close(kcore->fd); | |
1360 | unlink(filename); | |
1361 | return -1; | |
1362 | } | |
1363 | ||
1364 | static void kcore__close(struct kcore *kcore) | |
1365 | { | |
1366 | elf_end(kcore->elf); | |
1367 | close(kcore->fd); | |
1368 | } | |
1369 | ||
1370 | static int kcore__copy_hdr(struct kcore *from, struct kcore *to, size_t count) | |
1371 | { | |
1372 | GElf_Ehdr *ehdr = &to->ehdr; | |
1373 | GElf_Ehdr *kehdr = &from->ehdr; | |
1374 | ||
1375 | memcpy(ehdr->e_ident, kehdr->e_ident, EI_NIDENT); | |
1376 | ehdr->e_type = kehdr->e_type; | |
1377 | ehdr->e_machine = kehdr->e_machine; | |
1378 | ehdr->e_version = kehdr->e_version; | |
1379 | ehdr->e_entry = 0; | |
1380 | ehdr->e_shoff = 0; | |
1381 | ehdr->e_flags = kehdr->e_flags; | |
1382 | ehdr->e_phnum = count; | |
1383 | ehdr->e_shentsize = 0; | |
1384 | ehdr->e_shnum = 0; | |
1385 | ehdr->e_shstrndx = 0; | |
1386 | ||
1387 | if (from->elfclass == ELFCLASS32) { | |
1388 | ehdr->e_phoff = sizeof(Elf32_Ehdr); | |
1389 | ehdr->e_ehsize = sizeof(Elf32_Ehdr); | |
1390 | ehdr->e_phentsize = sizeof(Elf32_Phdr); | |
1391 | } else { | |
1392 | ehdr->e_phoff = sizeof(Elf64_Ehdr); | |
1393 | ehdr->e_ehsize = sizeof(Elf64_Ehdr); | |
1394 | ehdr->e_phentsize = sizeof(Elf64_Phdr); | |
1395 | } | |
1396 | ||
1397 | if (!gelf_update_ehdr(to->elf, ehdr)) | |
1398 | return -1; | |
1399 | ||
1400 | if (!gelf_newphdr(to->elf, count)) | |
1401 | return -1; | |
1402 | ||
1403 | return 0; | |
1404 | } | |
1405 | ||
1406 | static int kcore__add_phdr(struct kcore *kcore, int idx, off_t offset, | |
1407 | u64 addr, u64 len) | |
1408 | { | |
b5cabbcb AH |
1409 | GElf_Phdr phdr = { |
1410 | .p_type = PT_LOAD, | |
1411 | .p_flags = PF_R | PF_W | PF_X, | |
1412 | .p_offset = offset, | |
1413 | .p_vaddr = addr, | |
1414 | .p_paddr = 0, | |
1415 | .p_filesz = len, | |
1416 | .p_memsz = len, | |
1417 | .p_align = page_size, | |
1418 | }; | |
1419 | ||
1420 | if (!gelf_update_phdr(kcore->elf, idx, &phdr)) | |
afba19d9 AH |
1421 | return -1; |
1422 | ||
1423 | return 0; | |
1424 | } | |
1425 | ||
1426 | static off_t kcore__write(struct kcore *kcore) | |
1427 | { | |
1428 | return elf_update(kcore->elf, ELF_C_WRITE); | |
1429 | } | |
1430 | ||
fc1b691d AH |
1431 | struct phdr_data { |
1432 | off_t offset; | |
15acef6c | 1433 | off_t rel; |
fc1b691d AH |
1434 | u64 addr; |
1435 | u64 len; | |
f6838209 | 1436 | struct list_head node; |
22916fdb | 1437 | struct phdr_data *remaps; |
fc1b691d AH |
1438 | }; |
1439 | ||
a1a3a062 AH |
1440 | struct sym_data { |
1441 | u64 addr; | |
1442 | struct list_head node; | |
1443 | }; | |
1444 | ||
fc1b691d AH |
1445 | struct kcore_copy_info { |
1446 | u64 stext; | |
1447 | u64 etext; | |
1448 | u64 first_symbol; | |
1449 | u64 last_symbol; | |
1450 | u64 first_module; | |
1451 | u64 last_module_symbol; | |
6e97957d | 1452 | size_t phnum; |
f6838209 | 1453 | struct list_head phdrs; |
a1a3a062 | 1454 | struct list_head syms; |
fc1b691d AH |
1455 | }; |
1456 | ||
15acef6c AH |
1457 | #define kcore_copy__for_each_phdr(k, p) \ |
1458 | list_for_each_entry((p), &(k)->phdrs, node) | |
1459 | ||
b4503cdb AH |
1460 | static struct phdr_data *phdr_data__new(u64 addr, u64 len, off_t offset) |
1461 | { | |
1462 | struct phdr_data *p = zalloc(sizeof(*p)); | |
1463 | ||
1464 | if (p) { | |
1465 | p->addr = addr; | |
1466 | p->len = len; | |
1467 | p->offset = offset; | |
1468 | } | |
1469 | ||
1470 | return p; | |
1471 | } | |
1472 | ||
1473 | static struct phdr_data *kcore_copy_info__addnew(struct kcore_copy_info *kci, | |
1474 | u64 addr, u64 len, | |
1475 | off_t offset) | |
1476 | { | |
1477 | struct phdr_data *p = phdr_data__new(addr, len, offset); | |
1478 | ||
1479 | if (p) | |
1480 | list_add_tail(&p->node, &kci->phdrs); | |
1481 | ||
1482 | return p; | |
1483 | } | |
1484 | ||
1485 | static void kcore_copy__free_phdrs(struct kcore_copy_info *kci) | |
1486 | { | |
1487 | struct phdr_data *p, *tmp; | |
1488 | ||
1489 | list_for_each_entry_safe(p, tmp, &kci->phdrs, node) { | |
e56fbc9d | 1490 | list_del_init(&p->node); |
b4503cdb AH |
1491 | free(p); |
1492 | } | |
1493 | } | |
1494 | ||
a1a3a062 AH |
1495 | static struct sym_data *kcore_copy__new_sym(struct kcore_copy_info *kci, |
1496 | u64 addr) | |
1497 | { | |
1498 | struct sym_data *s = zalloc(sizeof(*s)); | |
1499 | ||
1500 | if (s) { | |
1501 | s->addr = addr; | |
1502 | list_add_tail(&s->node, &kci->syms); | |
1503 | } | |
1504 | ||
1505 | return s; | |
1506 | } | |
1507 | ||
1508 | static void kcore_copy__free_syms(struct kcore_copy_info *kci) | |
1509 | { | |
1510 | struct sym_data *s, *tmp; | |
1511 | ||
1512 | list_for_each_entry_safe(s, tmp, &kci->syms, node) { | |
e56fbc9d | 1513 | list_del_init(&s->node); |
a1a3a062 AH |
1514 | free(s); |
1515 | } | |
1516 | } | |
1517 | ||
fc1b691d AH |
1518 | static int kcore_copy__process_kallsyms(void *arg, const char *name, char type, |
1519 | u64 start) | |
1520 | { | |
1521 | struct kcore_copy_info *kci = arg; | |
1522 | ||
e85e0e0c | 1523 | if (!kallsyms__is_function(type)) |
fc1b691d AH |
1524 | return 0; |
1525 | ||
1526 | if (strchr(name, '[')) { | |
1527 | if (start > kci->last_module_symbol) | |
1528 | kci->last_module_symbol = start; | |
1529 | return 0; | |
1530 | } | |
1531 | ||
1532 | if (!kci->first_symbol || start < kci->first_symbol) | |
1533 | kci->first_symbol = start; | |
1534 | ||
1535 | if (!kci->last_symbol || start > kci->last_symbol) | |
1536 | kci->last_symbol = start; | |
1537 | ||
1538 | if (!strcmp(name, "_stext")) { | |
1539 | kci->stext = start; | |
1540 | return 0; | |
1541 | } | |
1542 | ||
1543 | if (!strcmp(name, "_etext")) { | |
1544 | kci->etext = start; | |
1545 | return 0; | |
1546 | } | |
1547 | ||
a1a3a062 AH |
1548 | if (is_entry_trampoline(name) && !kcore_copy__new_sym(kci, start)) |
1549 | return -1; | |
1550 | ||
fc1b691d AH |
1551 | return 0; |
1552 | } | |
1553 | ||
1554 | static int kcore_copy__parse_kallsyms(struct kcore_copy_info *kci, | |
1555 | const char *dir) | |
1556 | { | |
1557 | char kallsyms_filename[PATH_MAX]; | |
1558 | ||
1559 | scnprintf(kallsyms_filename, PATH_MAX, "%s/kallsyms", dir); | |
1560 | ||
1561 | if (symbol__restricted_filename(kallsyms_filename, "/proc/kallsyms")) | |
1562 | return -1; | |
1563 | ||
1564 | if (kallsyms__parse(kallsyms_filename, kci, | |
1565 | kcore_copy__process_kallsyms) < 0) | |
1566 | return -1; | |
1567 | ||
1568 | return 0; | |
1569 | } | |
1570 | ||
1571 | static int kcore_copy__process_modules(void *arg, | |
1572 | const char *name __maybe_unused, | |
9ad4652b | 1573 | u64 start, u64 size __maybe_unused) |
fc1b691d AH |
1574 | { |
1575 | struct kcore_copy_info *kci = arg; | |
1576 | ||
1577 | if (!kci->first_module || start < kci->first_module) | |
1578 | kci->first_module = start; | |
1579 | ||
1580 | return 0; | |
1581 | } | |
1582 | ||
1583 | static int kcore_copy__parse_modules(struct kcore_copy_info *kci, | |
1584 | const char *dir) | |
1585 | { | |
1586 | char modules_filename[PATH_MAX]; | |
1587 | ||
1588 | scnprintf(modules_filename, PATH_MAX, "%s/modules", dir); | |
1589 | ||
1590 | if (symbol__restricted_filename(modules_filename, "/proc/modules")) | |
1591 | return -1; | |
1592 | ||
1593 | if (modules__parse(modules_filename, kci, | |
1594 | kcore_copy__process_modules) < 0) | |
1595 | return -1; | |
1596 | ||
1597 | return 0; | |
1598 | } | |
1599 | ||
b4503cdb AH |
1600 | static int kcore_copy__map(struct kcore_copy_info *kci, u64 start, u64 end, |
1601 | u64 pgoff, u64 s, u64 e) | |
fc1b691d | 1602 | { |
b4503cdb AH |
1603 | u64 len, offset; |
1604 | ||
1605 | if (s < start || s >= end) | |
1606 | return 0; | |
fc1b691d | 1607 | |
b4503cdb AH |
1608 | offset = (s - start) + pgoff; |
1609 | len = e < end ? e - s : end - s; | |
1610 | ||
1611 | return kcore_copy_info__addnew(kci, s, len, offset) ? 0 : -1; | |
fc1b691d AH |
1612 | } |
1613 | ||
1614 | static int kcore_copy__read_map(u64 start, u64 len, u64 pgoff, void *data) | |
1615 | { | |
1616 | struct kcore_copy_info *kci = data; | |
1617 | u64 end = start + len; | |
a1a3a062 | 1618 | struct sym_data *sdat; |
fc1b691d | 1619 | |
b4503cdb AH |
1620 | if (kcore_copy__map(kci, start, end, pgoff, kci->stext, kci->etext)) |
1621 | return -1; | |
fc1b691d | 1622 | |
b4503cdb AH |
1623 | if (kcore_copy__map(kci, start, end, pgoff, kci->first_module, |
1624 | kci->last_module_symbol)) | |
1625 | return -1; | |
fc1b691d | 1626 | |
a1a3a062 AH |
1627 | list_for_each_entry(sdat, &kci->syms, node) { |
1628 | u64 s = round_down(sdat->addr, page_size); | |
1629 | ||
1630 | if (kcore_copy__map(kci, start, end, pgoff, s, s + len)) | |
1631 | return -1; | |
1632 | } | |
1633 | ||
fc1b691d AH |
1634 | return 0; |
1635 | } | |
1636 | ||
1637 | static int kcore_copy__read_maps(struct kcore_copy_info *kci, Elf *elf) | |
1638 | { | |
1639 | if (elf_read_maps(elf, true, kcore_copy__read_map, kci) < 0) | |
1640 | return -1; | |
1641 | ||
1642 | return 0; | |
1643 | } | |
1644 | ||
22916fdb AH |
1645 | static void kcore_copy__find_remaps(struct kcore_copy_info *kci) |
1646 | { | |
1647 | struct phdr_data *p, *k = NULL; | |
1648 | u64 kend; | |
1649 | ||
1650 | if (!kci->stext) | |
1651 | return; | |
1652 | ||
1653 | /* Find phdr that corresponds to the kernel map (contains stext) */ | |
1654 | kcore_copy__for_each_phdr(kci, p) { | |
1655 | u64 pend = p->addr + p->len - 1; | |
1656 | ||
1657 | if (p->addr <= kci->stext && pend >= kci->stext) { | |
1658 | k = p; | |
1659 | break; | |
1660 | } | |
1661 | } | |
1662 | ||
1663 | if (!k) | |
1664 | return; | |
1665 | ||
1666 | kend = k->offset + k->len; | |
1667 | ||
1668 | /* Find phdrs that remap the kernel */ | |
1669 | kcore_copy__for_each_phdr(kci, p) { | |
1670 | u64 pend = p->offset + p->len; | |
1671 | ||
1672 | if (p == k) | |
1673 | continue; | |
1674 | ||
1675 | if (p->offset >= k->offset && pend <= kend) | |
1676 | p->remaps = k; | |
1677 | } | |
1678 | } | |
1679 | ||
15acef6c AH |
1680 | static void kcore_copy__layout(struct kcore_copy_info *kci) |
1681 | { | |
1682 | struct phdr_data *p; | |
1683 | off_t rel = 0; | |
1684 | ||
22916fdb AH |
1685 | kcore_copy__find_remaps(kci); |
1686 | ||
15acef6c | 1687 | kcore_copy__for_each_phdr(kci, p) { |
22916fdb AH |
1688 | if (!p->remaps) { |
1689 | p->rel = rel; | |
1690 | rel += p->len; | |
1691 | } | |
15acef6c AH |
1692 | kci->phnum += 1; |
1693 | } | |
22916fdb AH |
1694 | |
1695 | kcore_copy__for_each_phdr(kci, p) { | |
1696 | struct phdr_data *k = p->remaps; | |
1697 | ||
1698 | if (k) | |
1699 | p->rel = p->offset - k->offset + k->rel; | |
1700 | } | |
15acef6c AH |
1701 | } |
1702 | ||
fc1b691d AH |
1703 | static int kcore_copy__calc_maps(struct kcore_copy_info *kci, const char *dir, |
1704 | Elf *elf) | |
1705 | { | |
1706 | if (kcore_copy__parse_kallsyms(kci, dir)) | |
1707 | return -1; | |
1708 | ||
1709 | if (kcore_copy__parse_modules(kci, dir)) | |
1710 | return -1; | |
1711 | ||
1712 | if (kci->stext) | |
1713 | kci->stext = round_down(kci->stext, page_size); | |
1714 | else | |
1715 | kci->stext = round_down(kci->first_symbol, page_size); | |
1716 | ||
1717 | if (kci->etext) { | |
1718 | kci->etext = round_up(kci->etext, page_size); | |
1719 | } else if (kci->last_symbol) { | |
1720 | kci->etext = round_up(kci->last_symbol, page_size); | |
1721 | kci->etext += page_size; | |
1722 | } | |
1723 | ||
1724 | kci->first_module = round_down(kci->first_module, page_size); | |
1725 | ||
1726 | if (kci->last_module_symbol) { | |
1727 | kci->last_module_symbol = round_up(kci->last_module_symbol, | |
1728 | page_size); | |
1729 | kci->last_module_symbol += page_size; | |
1730 | } | |
1731 | ||
1732 | if (!kci->stext || !kci->etext) | |
1733 | return -1; | |
1734 | ||
1735 | if (kci->first_module && !kci->last_module_symbol) | |
1736 | return -1; | |
1737 | ||
15acef6c AH |
1738 | if (kcore_copy__read_maps(kci, elf)) |
1739 | return -1; | |
1740 | ||
1741 | kcore_copy__layout(kci); | |
1742 | ||
1743 | return 0; | |
fc1b691d AH |
1744 | } |
1745 | ||
1746 | static int kcore_copy__copy_file(const char *from_dir, const char *to_dir, | |
1747 | const char *name) | |
1748 | { | |
1749 | char from_filename[PATH_MAX]; | |
1750 | char to_filename[PATH_MAX]; | |
1751 | ||
1752 | scnprintf(from_filename, PATH_MAX, "%s/%s", from_dir, name); | |
1753 | scnprintf(to_filename, PATH_MAX, "%s/%s", to_dir, name); | |
1754 | ||
1755 | return copyfile_mode(from_filename, to_filename, 0400); | |
1756 | } | |
1757 | ||
1758 | static int kcore_copy__unlink(const char *dir, const char *name) | |
1759 | { | |
1760 | char filename[PATH_MAX]; | |
1761 | ||
1762 | scnprintf(filename, PATH_MAX, "%s/%s", dir, name); | |
1763 | ||
1764 | return unlink(filename); | |
1765 | } | |
1766 | ||
1767 | static int kcore_copy__compare_fds(int from, int to) | |
1768 | { | |
1769 | char *buf_from; | |
1770 | char *buf_to; | |
1771 | ssize_t ret; | |
1772 | size_t len; | |
1773 | int err = -1; | |
1774 | ||
1775 | buf_from = malloc(page_size); | |
1776 | buf_to = malloc(page_size); | |
1777 | if (!buf_from || !buf_to) | |
1778 | goto out; | |
1779 | ||
1780 | while (1) { | |
1781 | /* Use read because mmap won't work on proc files */ | |
1782 | ret = read(from, buf_from, page_size); | |
1783 | if (ret < 0) | |
1784 | goto out; | |
1785 | ||
1786 | if (!ret) | |
1787 | break; | |
1788 | ||
1789 | len = ret; | |
1790 | ||
1791 | if (readn(to, buf_to, len) != (int)len) | |
1792 | goto out; | |
1793 | ||
1794 | if (memcmp(buf_from, buf_to, len)) | |
1795 | goto out; | |
1796 | } | |
1797 | ||
1798 | err = 0; | |
1799 | out: | |
1800 | free(buf_to); | |
1801 | free(buf_from); | |
1802 | return err; | |
1803 | } | |
1804 | ||
1805 | static int kcore_copy__compare_files(const char *from_filename, | |
1806 | const char *to_filename) | |
1807 | { | |
1808 | int from, to, err = -1; | |
1809 | ||
1810 | from = open(from_filename, O_RDONLY); | |
1811 | if (from < 0) | |
1812 | return -1; | |
1813 | ||
1814 | to = open(to_filename, O_RDONLY); | |
1815 | if (to < 0) | |
1816 | goto out_close_from; | |
1817 | ||
1818 | err = kcore_copy__compare_fds(from, to); | |
1819 | ||
1820 | close(to); | |
1821 | out_close_from: | |
1822 | close(from); | |
1823 | return err; | |
1824 | } | |
1825 | ||
1826 | static int kcore_copy__compare_file(const char *from_dir, const char *to_dir, | |
1827 | const char *name) | |
1828 | { | |
1829 | char from_filename[PATH_MAX]; | |
1830 | char to_filename[PATH_MAX]; | |
1831 | ||
1832 | scnprintf(from_filename, PATH_MAX, "%s/%s", from_dir, name); | |
1833 | scnprintf(to_filename, PATH_MAX, "%s/%s", to_dir, name); | |
1834 | ||
1835 | return kcore_copy__compare_files(from_filename, to_filename); | |
1836 | } | |
1837 | ||
1838 | /** | |
1839 | * kcore_copy - copy kallsyms, modules and kcore from one directory to another. | |
1840 | * @from_dir: from directory | |
1841 | * @to_dir: to directory | |
1842 | * | |
1843 | * This function copies kallsyms, modules and kcore files from one directory to | |
1844 | * another. kallsyms and modules are copied entirely. Only code segments are | |
1845 | * copied from kcore. It is assumed that two segments suffice: one for the | |
1846 | * kernel proper and one for all the modules. The code segments are determined | |
1847 | * from kallsyms and modules files. The kernel map starts at _stext or the | |
1848 | * lowest function symbol, and ends at _etext or the highest function symbol. | |
1849 | * The module map starts at the lowest module address and ends at the highest | |
1850 | * module symbol. Start addresses are rounded down to the nearest page. End | |
1851 | * addresses are rounded up to the nearest page. An extra page is added to the | |
1852 | * highest kernel symbol and highest module symbol to, hopefully, encompass that | |
1853 | * symbol too. Because it contains only code sections, the resulting kcore is | |
1854 | * unusual. One significant peculiarity is that the mapping (start -> pgoff) | |
1855 | * is not the same for the kernel map and the modules map. That happens because | |
1856 | * the data is copied adjacently whereas the original kcore has gaps. Finally, | |
1857 | * kallsyms and modules files are compared with their copies to check that | |
1858 | * modules have not been loaded or unloaded while the copies were taking place. | |
1859 | * | |
1860 | * Return: %0 on success, %-1 on failure. | |
1861 | */ | |
1862 | int kcore_copy(const char *from_dir, const char *to_dir) | |
1863 | { | |
1864 | struct kcore kcore; | |
1865 | struct kcore extract; | |
fc1b691d | 1866 | int idx = 0, err = -1; |
d2c95980 | 1867 | off_t offset, sz; |
fc1b691d AH |
1868 | struct kcore_copy_info kci = { .stext = 0, }; |
1869 | char kcore_filename[PATH_MAX]; | |
1870 | char extract_filename[PATH_MAX]; | |
d2c95980 | 1871 | struct phdr_data *p; |
fc1b691d | 1872 | |
f6838209 | 1873 | INIT_LIST_HEAD(&kci.phdrs); |
a1a3a062 | 1874 | INIT_LIST_HEAD(&kci.syms); |
f6838209 | 1875 | |
fc1b691d AH |
1876 | if (kcore_copy__copy_file(from_dir, to_dir, "kallsyms")) |
1877 | return -1; | |
1878 | ||
1879 | if (kcore_copy__copy_file(from_dir, to_dir, "modules")) | |
1880 | goto out_unlink_kallsyms; | |
1881 | ||
1882 | scnprintf(kcore_filename, PATH_MAX, "%s/kcore", from_dir); | |
1883 | scnprintf(extract_filename, PATH_MAX, "%s/kcore", to_dir); | |
1884 | ||
1885 | if (kcore__open(&kcore, kcore_filename)) | |
1886 | goto out_unlink_modules; | |
1887 | ||
1888 | if (kcore_copy__calc_maps(&kci, from_dir, kcore.elf)) | |
1889 | goto out_kcore_close; | |
1890 | ||
1891 | if (kcore__init(&extract, extract_filename, kcore.elfclass, false)) | |
1892 | goto out_kcore_close; | |
1893 | ||
6e97957d | 1894 | if (kcore__copy_hdr(&kcore, &extract, kci.phnum)) |
fc1b691d AH |
1895 | goto out_extract_close; |
1896 | ||
c9dd1d89 AH |
1897 | offset = gelf_fsize(extract.elf, ELF_T_EHDR, 1, EV_CURRENT) + |
1898 | gelf_fsize(extract.elf, ELF_T_PHDR, kci.phnum, EV_CURRENT); | |
1899 | offset = round_up(offset, page_size); | |
1900 | ||
d2c95980 AH |
1901 | kcore_copy__for_each_phdr(&kci, p) { |
1902 | off_t offs = p->rel + offset; | |
fc1b691d | 1903 | |
d2c95980 | 1904 | if (kcore__add_phdr(&extract, idx++, offs, p->addr, p->len)) |
fc1b691d AH |
1905 | goto out_extract_close; |
1906 | } | |
1907 | ||
1908 | sz = kcore__write(&extract); | |
1909 | if (sz < 0 || sz > offset) | |
1910 | goto out_extract_close; | |
1911 | ||
d2c95980 AH |
1912 | kcore_copy__for_each_phdr(&kci, p) { |
1913 | off_t offs = p->rel + offset; | |
fc1b691d | 1914 | |
22916fdb AH |
1915 | if (p->remaps) |
1916 | continue; | |
d2c95980 AH |
1917 | if (copy_bytes(kcore.fd, p->offset, extract.fd, offs, p->len)) |
1918 | goto out_extract_close; | |
1919 | } | |
fc1b691d AH |
1920 | |
1921 | if (kcore_copy__compare_file(from_dir, to_dir, "modules")) | |
1922 | goto out_extract_close; | |
1923 | ||
1924 | if (kcore_copy__compare_file(from_dir, to_dir, "kallsyms")) | |
1925 | goto out_extract_close; | |
1926 | ||
1927 | err = 0; | |
1928 | ||
1929 | out_extract_close: | |
1930 | kcore__close(&extract); | |
1931 | if (err) | |
1932 | unlink(extract_filename); | |
1933 | out_kcore_close: | |
1934 | kcore__close(&kcore); | |
1935 | out_unlink_modules: | |
1936 | if (err) | |
1937 | kcore_copy__unlink(to_dir, "modules"); | |
1938 | out_unlink_kallsyms: | |
1939 | if (err) | |
1940 | kcore_copy__unlink(to_dir, "kallsyms"); | |
1941 | ||
b4503cdb | 1942 | kcore_copy__free_phdrs(&kci); |
a1a3a062 | 1943 | kcore_copy__free_syms(&kci); |
b4503cdb | 1944 | |
fc1b691d AH |
1945 | return err; |
1946 | } | |
1947 | ||
afba19d9 AH |
1948 | int kcore_extract__create(struct kcore_extract *kce) |
1949 | { | |
1950 | struct kcore kcore; | |
1951 | struct kcore extract; | |
1952 | size_t count = 1; | |
1953 | int idx = 0, err = -1; | |
1954 | off_t offset = page_size, sz; | |
1955 | ||
1956 | if (kcore__open(&kcore, kce->kcore_filename)) | |
1957 | return -1; | |
1958 | ||
1959 | strcpy(kce->extract_filename, PERF_KCORE_EXTRACT); | |
1960 | if (kcore__init(&extract, kce->extract_filename, kcore.elfclass, true)) | |
1961 | goto out_kcore_close; | |
1962 | ||
1963 | if (kcore__copy_hdr(&kcore, &extract, count)) | |
1964 | goto out_extract_close; | |
1965 | ||
1966 | if (kcore__add_phdr(&extract, idx, offset, kce->addr, kce->len)) | |
1967 | goto out_extract_close; | |
1968 | ||
1969 | sz = kcore__write(&extract); | |
1970 | if (sz < 0 || sz > offset) | |
1971 | goto out_extract_close; | |
1972 | ||
1973 | if (copy_bytes(kcore.fd, kce->offs, extract.fd, offset, kce->len)) | |
1974 | goto out_extract_close; | |
1975 | ||
1976 | err = 0; | |
1977 | ||
1978 | out_extract_close: | |
1979 | kcore__close(&extract); | |
1980 | if (err) | |
1981 | unlink(kce->extract_filename); | |
1982 | out_kcore_close: | |
1983 | kcore__close(&kcore); | |
1984 | ||
1985 | return err; | |
1986 | } | |
1987 | ||
1988 | void kcore_extract__delete(struct kcore_extract *kce) | |
1989 | { | |
1990 | unlink(kce->extract_filename); | |
1991 | } | |
1992 | ||
1c1a3a47 | 1993 | #ifdef HAVE_GELF_GETNOTE_SUPPORT |
5a5e3d3c RB |
1994 | |
1995 | static void sdt_adjust_loc(struct sdt_note *tmp, GElf_Addr base_off) | |
1996 | { | |
1997 | if (!base_off) | |
1998 | return; | |
1999 | ||
2000 | if (tmp->bit32) | |
2001 | tmp->addr.a32[SDT_NOTE_IDX_LOC] = | |
2002 | tmp->addr.a32[SDT_NOTE_IDX_LOC] + base_off - | |
2003 | tmp->addr.a32[SDT_NOTE_IDX_BASE]; | |
2004 | else | |
2005 | tmp->addr.a64[SDT_NOTE_IDX_LOC] = | |
2006 | tmp->addr.a64[SDT_NOTE_IDX_LOC] + base_off - | |
2007 | tmp->addr.a64[SDT_NOTE_IDX_BASE]; | |
2008 | } | |
2009 | ||
2010 | static void sdt_adjust_refctr(struct sdt_note *tmp, GElf_Addr base_addr, | |
2011 | GElf_Addr base_off) | |
2012 | { | |
2013 | if (!base_off) | |
2014 | return; | |
2015 | ||
2016 | if (tmp->bit32 && tmp->addr.a32[SDT_NOTE_IDX_REFCTR]) | |
2017 | tmp->addr.a32[SDT_NOTE_IDX_REFCTR] -= (base_addr - base_off); | |
2018 | else if (tmp->addr.a64[SDT_NOTE_IDX_REFCTR]) | |
2019 | tmp->addr.a64[SDT_NOTE_IDX_REFCTR] -= (base_addr - base_off); | |
2020 | } | |
2021 | ||
060fa0c7 HK |
2022 | /** |
2023 | * populate_sdt_note : Parse raw data and identify SDT note | |
2024 | * @elf: elf of the opened file | |
2025 | * @data: raw data of a section with description offset applied | |
2026 | * @len: note description size | |
2027 | * @type: type of the note | |
2028 | * @sdt_notes: List to add the SDT note | |
2029 | * | |
2030 | * Responsible for parsing the @data in section .note.stapsdt in @elf and | |
2031 | * if its an SDT note, it appends to @sdt_notes list. | |
2032 | */ | |
2033 | static int populate_sdt_note(Elf **elf, const char *data, size_t len, | |
2034 | struct list_head *sdt_notes) | |
2035 | { | |
be88184b | 2036 | const char *provider, *name, *args; |
060fa0c7 HK |
2037 | struct sdt_note *tmp = NULL; |
2038 | GElf_Ehdr ehdr; | |
060fa0c7 HK |
2039 | GElf_Shdr shdr; |
2040 | int ret = -EINVAL; | |
2041 | ||
2042 | union { | |
2043 | Elf64_Addr a64[NR_ADDR]; | |
2044 | Elf32_Addr a32[NR_ADDR]; | |
2045 | } buf; | |
2046 | ||
2047 | Elf_Data dst = { | |
2048 | .d_buf = &buf, .d_type = ELF_T_ADDR, .d_version = EV_CURRENT, | |
2049 | .d_size = gelf_fsize((*elf), ELF_T_ADDR, NR_ADDR, EV_CURRENT), | |
2050 | .d_off = 0, .d_align = 0 | |
2051 | }; | |
2052 | Elf_Data src = { | |
2053 | .d_buf = (void *) data, .d_type = ELF_T_ADDR, | |
2054 | .d_version = EV_CURRENT, .d_size = dst.d_size, .d_off = 0, | |
2055 | .d_align = 0 | |
2056 | }; | |
2057 | ||
2058 | tmp = (struct sdt_note *)calloc(1, sizeof(struct sdt_note)); | |
2059 | if (!tmp) { | |
2060 | ret = -ENOMEM; | |
2061 | goto out_err; | |
2062 | } | |
2063 | ||
2064 | INIT_LIST_HEAD(&tmp->note_list); | |
2065 | ||
2066 | if (len < dst.d_size + 3) | |
2067 | goto out_free_note; | |
2068 | ||
2069 | /* Translation from file representation to memory representation */ | |
2070 | if (gelf_xlatetom(*elf, &dst, &src, | |
2071 | elf_getident(*elf, NULL)[EI_DATA]) == NULL) { | |
2072 | pr_err("gelf_xlatetom : %s\n", elf_errmsg(-1)); | |
2073 | goto out_free_note; | |
2074 | } | |
2075 | ||
2076 | /* Populate the fields of sdt_note */ | |
2077 | provider = data + dst.d_size; | |
2078 | ||
2079 | name = (const char *)memchr(provider, '\0', data + len - provider); | |
2080 | if (name++ == NULL) | |
2081 | goto out_free_note; | |
2082 | ||
2083 | tmp->provider = strdup(provider); | |
2084 | if (!tmp->provider) { | |
2085 | ret = -ENOMEM; | |
2086 | goto out_free_note; | |
2087 | } | |
2088 | tmp->name = strdup(name); | |
2089 | if (!tmp->name) { | |
2090 | ret = -ENOMEM; | |
2091 | goto out_free_prov; | |
2092 | } | |
2093 | ||
be88184b AB |
2094 | args = memchr(name, '\0', data + len - name); |
2095 | ||
2096 | /* | |
2097 | * There is no argument if: | |
2098 | * - We reached the end of the note; | |
2099 | * - There is not enough room to hold a potential string; | |
2100 | * - The argument string is empty or just contains ':'. | |
2101 | */ | |
2102 | if (args == NULL || data + len - args < 2 || | |
2103 | args[1] == ':' || args[1] == '\0') | |
2104 | tmp->args = NULL; | |
2105 | else { | |
2106 | tmp->args = strdup(++args); | |
2107 | if (!tmp->args) { | |
2108 | ret = -ENOMEM; | |
2109 | goto out_free_name; | |
2110 | } | |
2111 | } | |
2112 | ||
060fa0c7 HK |
2113 | if (gelf_getclass(*elf) == ELFCLASS32) { |
2114 | memcpy(&tmp->addr, &buf, 3 * sizeof(Elf32_Addr)); | |
2115 | tmp->bit32 = true; | |
2116 | } else { | |
2117 | memcpy(&tmp->addr, &buf, 3 * sizeof(Elf64_Addr)); | |
2118 | tmp->bit32 = false; | |
2119 | } | |
2120 | ||
2121 | if (!gelf_getehdr(*elf, &ehdr)) { | |
2122 | pr_debug("%s : cannot get elf header.\n", __func__); | |
2123 | ret = -EBADF; | |
be88184b | 2124 | goto out_free_args; |
060fa0c7 HK |
2125 | } |
2126 | ||
2127 | /* Adjust the prelink effect : | |
2128 | * Find out the .stapsdt.base section. | |
2129 | * This scn will help us to handle prelinking (if present). | |
2130 | * Compare the retrieved file offset of the base section with the | |
2131 | * base address in the description of the SDT note. If its different, | |
2132 | * then accordingly, adjust the note location. | |
2133 | */ | |
5a5e3d3c RB |
2134 | if (elf_section_by_name(*elf, &ehdr, &shdr, SDT_BASE_SCN, NULL)) |
2135 | sdt_adjust_loc(tmp, shdr.sh_offset); | |
2136 | ||
2137 | /* Adjust reference counter offset */ | |
2138 | if (elf_section_by_name(*elf, &ehdr, &shdr, SDT_PROBES_SCN, NULL)) | |
2139 | sdt_adjust_refctr(tmp, shdr.sh_addr, shdr.sh_offset); | |
060fa0c7 HK |
2140 | |
2141 | list_add_tail(&tmp->note_list, sdt_notes); | |
2142 | return 0; | |
2143 | ||
be88184b | 2144 | out_free_args: |
d8f9da24 | 2145 | zfree(&tmp->args); |
060fa0c7 | 2146 | out_free_name: |
d8f9da24 | 2147 | zfree(&tmp->name); |
060fa0c7 | 2148 | out_free_prov: |
d8f9da24 | 2149 | zfree(&tmp->provider); |
060fa0c7 HK |
2150 | out_free_note: |
2151 | free(tmp); | |
2152 | out_err: | |
2153 | return ret; | |
2154 | } | |
2155 | ||
2156 | /** | |
2157 | * construct_sdt_notes_list : constructs a list of SDT notes | |
2158 | * @elf : elf to look into | |
2159 | * @sdt_notes : empty list_head | |
2160 | * | |
2161 | * Scans the sections in 'elf' for the section | |
2162 | * .note.stapsdt. It, then calls populate_sdt_note to find | |
2163 | * out the SDT events and populates the 'sdt_notes'. | |
2164 | */ | |
2165 | static int construct_sdt_notes_list(Elf *elf, struct list_head *sdt_notes) | |
2166 | { | |
2167 | GElf_Ehdr ehdr; | |
2168 | Elf_Scn *scn = NULL; | |
2169 | Elf_Data *data; | |
2170 | GElf_Shdr shdr; | |
2171 | size_t shstrndx, next; | |
2172 | GElf_Nhdr nhdr; | |
2173 | size_t name_off, desc_off, offset; | |
2174 | int ret = 0; | |
2175 | ||
2176 | if (gelf_getehdr(elf, &ehdr) == NULL) { | |
2177 | ret = -EBADF; | |
2178 | goto out_ret; | |
2179 | } | |
2180 | if (elf_getshdrstrndx(elf, &shstrndx) != 0) { | |
2181 | ret = -EBADF; | |
2182 | goto out_ret; | |
2183 | } | |
2184 | ||
2185 | /* Look for the required section */ | |
2186 | scn = elf_section_by_name(elf, &ehdr, &shdr, SDT_NOTE_SCN, NULL); | |
2187 | if (!scn) { | |
2188 | ret = -ENOENT; | |
2189 | goto out_ret; | |
2190 | } | |
2191 | ||
2192 | if ((shdr.sh_type != SHT_NOTE) || (shdr.sh_flags & SHF_ALLOC)) { | |
2193 | ret = -ENOENT; | |
2194 | goto out_ret; | |
2195 | } | |
2196 | ||
2197 | data = elf_getdata(scn, NULL); | |
2198 | ||
2199 | /* Get the SDT notes */ | |
2200 | for (offset = 0; (next = gelf_getnote(data, offset, &nhdr, &name_off, | |
2201 | &desc_off)) > 0; offset = next) { | |
2202 | if (nhdr.n_namesz == sizeof(SDT_NOTE_NAME) && | |
2203 | !memcmp(data->d_buf + name_off, SDT_NOTE_NAME, | |
2204 | sizeof(SDT_NOTE_NAME))) { | |
2205 | /* Check the type of the note */ | |
2206 | if (nhdr.n_type != SDT_NOTE_TYPE) | |
2207 | goto out_ret; | |
2208 | ||
2209 | ret = populate_sdt_note(&elf, ((data->d_buf) + desc_off), | |
2210 | nhdr.n_descsz, sdt_notes); | |
2211 | if (ret < 0) | |
2212 | goto out_ret; | |
2213 | } | |
2214 | } | |
2215 | if (list_empty(sdt_notes)) | |
2216 | ret = -ENOENT; | |
2217 | ||
2218 | out_ret: | |
2219 | return ret; | |
2220 | } | |
2221 | ||
2222 | /** | |
2223 | * get_sdt_note_list : Wrapper to construct a list of sdt notes | |
2224 | * @head : empty list_head | |
2225 | * @target : file to find SDT notes from | |
2226 | * | |
2227 | * This opens the file, initializes | |
2228 | * the ELF and then calls construct_sdt_notes_list. | |
2229 | */ | |
2230 | int get_sdt_note_list(struct list_head *head, const char *target) | |
2231 | { | |
2232 | Elf *elf; | |
2233 | int fd, ret; | |
2234 | ||
2235 | fd = open(target, O_RDONLY); | |
2236 | if (fd < 0) | |
2237 | return -EBADF; | |
2238 | ||
2239 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
2240 | if (!elf) { | |
2241 | ret = -EBADF; | |
2242 | goto out_close; | |
2243 | } | |
2244 | ret = construct_sdt_notes_list(elf, head); | |
2245 | elf_end(elf); | |
2246 | out_close: | |
2247 | close(fd); | |
2248 | return ret; | |
2249 | } | |
2250 | ||
2251 | /** | |
2252 | * cleanup_sdt_note_list : free the sdt notes' list | |
2253 | * @sdt_notes: sdt notes' list | |
2254 | * | |
2255 | * Free up the SDT notes in @sdt_notes. | |
2256 | * Returns the number of SDT notes free'd. | |
2257 | */ | |
2258 | int cleanup_sdt_note_list(struct list_head *sdt_notes) | |
2259 | { | |
2260 | struct sdt_note *tmp, *pos; | |
2261 | int nr_free = 0; | |
2262 | ||
2263 | list_for_each_entry_safe(pos, tmp, sdt_notes, note_list) { | |
e56fbc9d | 2264 | list_del_init(&pos->note_list); |
d8f9da24 ACM |
2265 | zfree(&pos->name); |
2266 | zfree(&pos->provider); | |
060fa0c7 HK |
2267 | free(pos); |
2268 | nr_free++; | |
2269 | } | |
2270 | return nr_free; | |
2271 | } | |
2272 | ||
2273 | /** | |
2274 | * sdt_notes__get_count: Counts the number of sdt events | |
2275 | * @start: list_head to sdt_notes list | |
2276 | * | |
2277 | * Returns the number of SDT notes in a list | |
2278 | */ | |
2279 | int sdt_notes__get_count(struct list_head *start) | |
2280 | { | |
2281 | struct sdt_note *sdt_ptr; | |
2282 | int count = 0; | |
2283 | ||
2284 | list_for_each_entry(sdt_ptr, start, note_list) | |
2285 | count++; | |
2286 | return count; | |
2287 | } | |
1c1a3a47 | 2288 | #endif |
060fa0c7 | 2289 | |
e5a1845f NK |
2290 | void symbol__elf_init(void) |
2291 | { | |
2292 | elf_version(EV_CURRENT); | |
2293 | } |