Commit | Line | Data |
---|---|---|
b1d1b094 | 1 | #include "dso.h" |
393be2e3 | 2 | #include "symbol.h" |
b1d1b094 | 3 | #include "symsrc.h" |
393be2e3 | 4 | |
a43783ae | 5 | #include <errno.h> |
68c0188e | 6 | #include <unistd.h> |
b691f643 NK |
7 | #include <stdio.h> |
8 | #include <fcntl.h> | |
9 | #include <string.h> | |
215a0d30 | 10 | #include <stdlib.h> |
b691f643 NK |
11 | #include <byteswap.h> |
12 | #include <sys/stat.h> | |
7f7c536f | 13 | #include <linux/zalloc.h> |
fb71c86c | 14 | #include <internal/lib.h> |
b691f643 NK |
15 | |
16 | static bool check_need_swap(int file_endian) | |
393be2e3 | 17 | { |
b691f643 NK |
18 | const int data = 1; |
19 | u8 *check = (u8 *)&data; | |
20 | int host_endian; | |
21 | ||
22 | if (check[0] == 1) | |
23 | host_endian = ELFDATA2LSB; | |
24 | else | |
25 | host_endian = ELFDATA2MSB; | |
26 | ||
27 | return host_endian != file_endian; | |
393be2e3 NK |
28 | } |
29 | ||
b691f643 NK |
30 | #define NOTE_ALIGN(sz) (((sz) + 3) & ~3) |
31 | ||
32 | #define NT_GNU_BUILD_ID 3 | |
33 | ||
f766819c JO |
34 | static int read_build_id(void *note_data, size_t note_len, struct build_id *bid, |
35 | bool need_swap) | |
393be2e3 | 36 | { |
f766819c | 37 | size_t size = sizeof(bid->data); |
b691f643 NK |
38 | struct { |
39 | u32 n_namesz; | |
40 | u32 n_descsz; | |
41 | u32 n_type; | |
42 | } *nhdr; | |
43 | void *ptr; | |
44 | ||
45 | ptr = note_data; | |
46 | while (ptr < (note_data + note_len)) { | |
47 | const char *name; | |
48 | size_t namesz, descsz; | |
49 | ||
50 | nhdr = ptr; | |
51 | if (need_swap) { | |
52 | nhdr->n_namesz = bswap_32(nhdr->n_namesz); | |
53 | nhdr->n_descsz = bswap_32(nhdr->n_descsz); | |
54 | nhdr->n_type = bswap_32(nhdr->n_type); | |
55 | } | |
56 | ||
57 | namesz = NOTE_ALIGN(nhdr->n_namesz); | |
58 | descsz = NOTE_ALIGN(nhdr->n_descsz); | |
59 | ||
60 | ptr += sizeof(*nhdr); | |
61 | name = ptr; | |
62 | ptr += namesz; | |
63 | if (nhdr->n_type == NT_GNU_BUILD_ID && | |
64 | nhdr->n_namesz == sizeof("GNU")) { | |
65 | if (memcmp(name, "GNU", sizeof("GNU")) == 0) { | |
66 | size_t sz = min(size, descsz); | |
f766819c JO |
67 | memcpy(bid->data, ptr, sz); |
68 | memset(bid->data + sz, 0, size - sz); | |
69 | bid->size = sz; | |
b691f643 NK |
70 | return 0; |
71 | } | |
72 | } | |
73 | ptr += descsz; | |
74 | } | |
75 | ||
393be2e3 NK |
76 | return -1; |
77 | } | |
78 | ||
1d037ca1 IT |
79 | int filename__read_debuglink(const char *filename __maybe_unused, |
80 | char *debuglink __maybe_unused, | |
81 | size_t size __maybe_unused) | |
393be2e3 NK |
82 | { |
83 | return -1; | |
84 | } | |
85 | ||
b691f643 NK |
86 | /* |
87 | * Just try PT_NOTE header otherwise fails | |
88 | */ | |
f766819c | 89 | int filename__read_build_id(const char *filename, struct build_id *bid) |
b691f643 NK |
90 | { |
91 | FILE *fp; | |
92 | int ret = -1; | |
93 | bool need_swap = false; | |
94 | u8 e_ident[EI_NIDENT]; | |
95 | size_t buf_size; | |
96 | void *buf; | |
97 | int i; | |
98 | ||
99 | fp = fopen(filename, "r"); | |
100 | if (fp == NULL) | |
101 | return -1; | |
102 | ||
103 | if (fread(e_ident, sizeof(e_ident), 1, fp) != 1) | |
104 | goto out; | |
105 | ||
106 | if (memcmp(e_ident, ELFMAG, SELFMAG) || | |
107 | e_ident[EI_VERSION] != EV_CURRENT) | |
108 | goto out; | |
109 | ||
110 | need_swap = check_need_swap(e_ident[EI_DATA]); | |
111 | ||
112 | /* for simplicity */ | |
113 | fseek(fp, 0, SEEK_SET); | |
114 | ||
115 | if (e_ident[EI_CLASS] == ELFCLASS32) { | |
116 | Elf32_Ehdr ehdr; | |
117 | Elf32_Phdr *phdr; | |
118 | ||
119 | if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1) | |
120 | goto out; | |
121 | ||
122 | if (need_swap) { | |
123 | ehdr.e_phoff = bswap_32(ehdr.e_phoff); | |
124 | ehdr.e_phentsize = bswap_16(ehdr.e_phentsize); | |
125 | ehdr.e_phnum = bswap_16(ehdr.e_phnum); | |
126 | } | |
127 | ||
128 | buf_size = ehdr.e_phentsize * ehdr.e_phnum; | |
129 | buf = malloc(buf_size); | |
130 | if (buf == NULL) | |
131 | goto out; | |
132 | ||
133 | fseek(fp, ehdr.e_phoff, SEEK_SET); | |
134 | if (fread(buf, buf_size, 1, fp) != 1) | |
135 | goto out_free; | |
136 | ||
137 | for (i = 0, phdr = buf; i < ehdr.e_phnum; i++, phdr++) { | |
138 | void *tmp; | |
7ad74b41 | 139 | long offset; |
b691f643 NK |
140 | |
141 | if (need_swap) { | |
142 | phdr->p_type = bswap_32(phdr->p_type); | |
143 | phdr->p_offset = bswap_32(phdr->p_offset); | |
144 | phdr->p_filesz = bswap_32(phdr->p_filesz); | |
145 | } | |
146 | ||
147 | if (phdr->p_type != PT_NOTE) | |
148 | continue; | |
149 | ||
150 | buf_size = phdr->p_filesz; | |
7ad74b41 | 151 | offset = phdr->p_offset; |
b691f643 NK |
152 | tmp = realloc(buf, buf_size); |
153 | if (tmp == NULL) | |
154 | goto out_free; | |
155 | ||
156 | buf = tmp; | |
7ad74b41 | 157 | fseek(fp, offset, SEEK_SET); |
b691f643 NK |
158 | if (fread(buf, buf_size, 1, fp) != 1) |
159 | goto out_free; | |
160 | ||
f766819c | 161 | ret = read_build_id(buf, buf_size, bid, need_swap); |
d0acce68 | 162 | if (ret == 0) { |
f766819c | 163 | ret = bid->size; |
d0acce68 CD |
164 | break; |
165 | } | |
b691f643 NK |
166 | } |
167 | } else { | |
168 | Elf64_Ehdr ehdr; | |
169 | Elf64_Phdr *phdr; | |
170 | ||
171 | if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1) | |
172 | goto out; | |
173 | ||
174 | if (need_swap) { | |
175 | ehdr.e_phoff = bswap_64(ehdr.e_phoff); | |
176 | ehdr.e_phentsize = bswap_16(ehdr.e_phentsize); | |
177 | ehdr.e_phnum = bswap_16(ehdr.e_phnum); | |
178 | } | |
179 | ||
180 | buf_size = ehdr.e_phentsize * ehdr.e_phnum; | |
181 | buf = malloc(buf_size); | |
182 | if (buf == NULL) | |
183 | goto out; | |
184 | ||
185 | fseek(fp, ehdr.e_phoff, SEEK_SET); | |
186 | if (fread(buf, buf_size, 1, fp) != 1) | |
187 | goto out_free; | |
188 | ||
189 | for (i = 0, phdr = buf; i < ehdr.e_phnum; i++, phdr++) { | |
190 | void *tmp; | |
7ad74b41 | 191 | long offset; |
b691f643 NK |
192 | |
193 | if (need_swap) { | |
194 | phdr->p_type = bswap_32(phdr->p_type); | |
195 | phdr->p_offset = bswap_64(phdr->p_offset); | |
196 | phdr->p_filesz = bswap_64(phdr->p_filesz); | |
197 | } | |
198 | ||
199 | if (phdr->p_type != PT_NOTE) | |
200 | continue; | |
201 | ||
202 | buf_size = phdr->p_filesz; | |
7ad74b41 | 203 | offset = phdr->p_offset; |
b691f643 NK |
204 | tmp = realloc(buf, buf_size); |
205 | if (tmp == NULL) | |
206 | goto out_free; | |
207 | ||
208 | buf = tmp; | |
7ad74b41 | 209 | fseek(fp, offset, SEEK_SET); |
b691f643 NK |
210 | if (fread(buf, buf_size, 1, fp) != 1) |
211 | goto out_free; | |
212 | ||
f766819c | 213 | ret = read_build_id(buf, buf_size, bid, need_swap); |
d0acce68 | 214 | if (ret == 0) { |
f766819c | 215 | ret = bid->size; |
d0acce68 CD |
216 | break; |
217 | } | |
b691f643 NK |
218 | } |
219 | } | |
220 | out_free: | |
221 | free(buf); | |
222 | out: | |
223 | fclose(fp); | |
224 | return ret; | |
225 | } | |
226 | ||
3ff1b8c8 | 227 | int sysfs__read_build_id(const char *filename, struct build_id *bid) |
b691f643 NK |
228 | { |
229 | int fd; | |
230 | int ret = -1; | |
231 | struct stat stbuf; | |
232 | size_t buf_size; | |
233 | void *buf; | |
234 | ||
235 | fd = open(filename, O_RDONLY); | |
236 | if (fd < 0) | |
237 | return -1; | |
238 | ||
239 | if (fstat(fd, &stbuf) < 0) | |
240 | goto out; | |
241 | ||
242 | buf_size = stbuf.st_size; | |
243 | buf = malloc(buf_size); | |
244 | if (buf == NULL) | |
245 | goto out; | |
246 | ||
247 | if (read(fd, buf, buf_size) != (ssize_t) buf_size) | |
248 | goto out_free; | |
249 | ||
3ff1b8c8 | 250 | ret = read_build_id(buf, buf_size, bid, false); |
b691f643 NK |
251 | out_free: |
252 | free(buf); | |
253 | out: | |
254 | close(fd); | |
255 | return ret; | |
256 | } | |
257 | ||
18425f13 | 258 | int symsrc__init(struct symsrc *ss, struct dso *dso, const char *name, |
b68e2f91 CS |
259 | enum dso_binary_type type) |
260 | { | |
261 | int fd = open(name, O_RDONLY); | |
262 | if (fd < 0) | |
18425f13 | 263 | goto out_errno; |
b68e2f91 CS |
264 | |
265 | ss->name = strdup(name); | |
266 | if (!ss->name) | |
267 | goto out_close; | |
268 | ||
779e24e2 | 269 | ss->fd = fd; |
b68e2f91 CS |
270 | ss->type = type; |
271 | ||
272 | return 0; | |
273 | out_close: | |
274 | close(fd); | |
18425f13 | 275 | out_errno: |
ee756ef7 | 276 | RC_CHK_ACCESS(dso)->load_errno = errno; |
b68e2f91 CS |
277 | return -1; |
278 | } | |
279 | ||
1d037ca1 | 280 | bool symsrc__possibly_runtime(struct symsrc *ss __maybe_unused) |
3aafe5ae CS |
281 | { |
282 | /* Assume all sym sources could be a runtime image. */ | |
283 | return true; | |
284 | } | |
285 | ||
1d037ca1 | 286 | bool symsrc__has_symtab(struct symsrc *ss __maybe_unused) |
d26cd12b CS |
287 | { |
288 | return false; | |
289 | } | |
290 | ||
b68e2f91 CS |
291 | void symsrc__destroy(struct symsrc *ss) |
292 | { | |
74cf249d | 293 | zfree(&ss->name); |
b68e2f91 CS |
294 | close(ss->fd); |
295 | } | |
296 | ||
1d037ca1 | 297 | int dso__synthesize_plt_symbols(struct dso *dso __maybe_unused, |
3183f8ca | 298 | struct symsrc *ss __maybe_unused) |
393be2e3 NK |
299 | { |
300 | return 0; | |
301 | } | |
302 | ||
c6d8f2a4 AH |
303 | static int fd__is_64_bit(int fd) |
304 | { | |
305 | u8 e_ident[EI_NIDENT]; | |
306 | ||
307 | if (lseek(fd, 0, SEEK_SET)) | |
308 | return -1; | |
309 | ||
310 | if (readn(fd, e_ident, sizeof(e_ident)) != sizeof(e_ident)) | |
311 | return -1; | |
312 | ||
313 | if (memcmp(e_ident, ELFMAG, SELFMAG) || | |
314 | e_ident[EI_VERSION] != EV_CURRENT) | |
315 | return -1; | |
316 | ||
317 | return e_ident[EI_CLASS] == ELFCLASS64; | |
318 | } | |
319 | ||
2b5b8bb2 AH |
320 | enum dso_type dso__type_fd(int fd) |
321 | { | |
322 | Elf64_Ehdr ehdr; | |
323 | int ret; | |
324 | ||
325 | ret = fd__is_64_bit(fd); | |
326 | if (ret < 0) | |
327 | return DSO__TYPE_UNKNOWN; | |
328 | ||
329 | if (ret) | |
330 | return DSO__TYPE_64BIT; | |
331 | ||
332 | if (readn(fd, &ehdr, sizeof(ehdr)) != sizeof(ehdr)) | |
333 | return DSO__TYPE_UNKNOWN; | |
334 | ||
335 | if (ehdr.e_machine == EM_X86_64) | |
336 | return DSO__TYPE_X32BIT; | |
337 | ||
338 | return DSO__TYPE_32BIT; | |
339 | } | |
340 | ||
1d037ca1 IT |
341 | int dso__load_sym(struct dso *dso, struct map *map __maybe_unused, |
342 | struct symsrc *ss, | |
343 | struct symsrc *runtime_ss __maybe_unused, | |
1d037ca1 | 344 | int kmodule __maybe_unused) |
393be2e3 | 345 | { |
f766819c | 346 | struct build_id bid; |
c6d8f2a4 AH |
347 | int ret; |
348 | ||
349 | ret = fd__is_64_bit(ss->fd); | |
350 | if (ret >= 0) | |
ee756ef7 | 351 | RC_CHK_ACCESS(dso)->is_64_bit = ret; |
b691f643 | 352 | |
f766819c | 353 | if (filename__read_build_id(ss->name, &bid) > 0) |
8dfdf440 | 354 | dso__set_build_id(dso, &bid); |
393be2e3 NK |
355 | return 0; |
356 | } | |
357 | ||
8e0cf965 AH |
358 | int file__read_maps(int fd __maybe_unused, bool exe __maybe_unused, |
359 | mapfn_t mapfn __maybe_unused, void *data __maybe_unused, | |
360 | bool *is_64_bit __maybe_unused) | |
361 | { | |
362 | return -1; | |
363 | } | |
364 | ||
afba19d9 AH |
365 | int kcore_extract__create(struct kcore_extract *kce __maybe_unused) |
366 | { | |
367 | return -1; | |
368 | } | |
369 | ||
370 | void kcore_extract__delete(struct kcore_extract *kce __maybe_unused) | |
371 | { | |
372 | } | |
373 | ||
fc1b691d AH |
374 | int kcore_copy(const char *from_dir __maybe_unused, |
375 | const char *to_dir __maybe_unused) | |
376 | { | |
377 | return -1; | |
378 | } | |
379 | ||
393be2e3 NK |
380 | void symbol__elf_init(void) |
381 | { | |
382 | } | |
a64489c5 JY |
383 | |
384 | char *dso__demangle_sym(struct dso *dso __maybe_unused, | |
385 | int kmodule __maybe_unused, | |
80c345b2 | 386 | const char *elf_name __maybe_unused) |
a64489c5 JY |
387 | { |
388 | return NULL; | |
389 | } | |
06ea72a4 NK |
390 | |
391 | bool filename__has_section(const char *filename __maybe_unused, const char *sec __maybe_unused) | |
392 | { | |
393 | return false; | |
394 | } |