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Commit | Line | Data |
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393be2e3 | 1 | #include "symbol.h" |
74cf249d | 2 | #include "util.h" |
393be2e3 | 3 | |
a43783ae | 4 | #include <errno.h> |
b691f643 NK |
5 | #include <stdio.h> |
6 | #include <fcntl.h> | |
7 | #include <string.h> | |
8 | #include <byteswap.h> | |
9 | #include <sys/stat.h> | |
393be2e3 | 10 | |
b691f643 NK |
11 | |
12 | static bool check_need_swap(int file_endian) | |
393be2e3 | 13 | { |
b691f643 NK |
14 | const int data = 1; |
15 | u8 *check = (u8 *)&data; | |
16 | int host_endian; | |
17 | ||
18 | if (check[0] == 1) | |
19 | host_endian = ELFDATA2LSB; | |
20 | else | |
21 | host_endian = ELFDATA2MSB; | |
22 | ||
23 | return host_endian != file_endian; | |
393be2e3 NK |
24 | } |
25 | ||
b691f643 NK |
26 | #define NOTE_ALIGN(sz) (((sz) + 3) & ~3) |
27 | ||
28 | #define NT_GNU_BUILD_ID 3 | |
29 | ||
30 | static int read_build_id(void *note_data, size_t note_len, void *bf, | |
31 | size_t size, bool need_swap) | |
393be2e3 | 32 | { |
b691f643 NK |
33 | struct { |
34 | u32 n_namesz; | |
35 | u32 n_descsz; | |
36 | u32 n_type; | |
37 | } *nhdr; | |
38 | void *ptr; | |
39 | ||
40 | ptr = note_data; | |
41 | while (ptr < (note_data + note_len)) { | |
42 | const char *name; | |
43 | size_t namesz, descsz; | |
44 | ||
45 | nhdr = ptr; | |
46 | if (need_swap) { | |
47 | nhdr->n_namesz = bswap_32(nhdr->n_namesz); | |
48 | nhdr->n_descsz = bswap_32(nhdr->n_descsz); | |
49 | nhdr->n_type = bswap_32(nhdr->n_type); | |
50 | } | |
51 | ||
52 | namesz = NOTE_ALIGN(nhdr->n_namesz); | |
53 | descsz = NOTE_ALIGN(nhdr->n_descsz); | |
54 | ||
55 | ptr += sizeof(*nhdr); | |
56 | name = ptr; | |
57 | ptr += namesz; | |
58 | if (nhdr->n_type == NT_GNU_BUILD_ID && | |
59 | nhdr->n_namesz == sizeof("GNU")) { | |
60 | if (memcmp(name, "GNU", sizeof("GNU")) == 0) { | |
61 | size_t sz = min(size, descsz); | |
62 | memcpy(bf, ptr, sz); | |
63 | memset(bf + sz, 0, size - sz); | |
64 | return 0; | |
65 | } | |
66 | } | |
67 | ptr += descsz; | |
68 | } | |
69 | ||
393be2e3 NK |
70 | return -1; |
71 | } | |
72 | ||
1d037ca1 IT |
73 | int filename__read_debuglink(const char *filename __maybe_unused, |
74 | char *debuglink __maybe_unused, | |
75 | size_t size __maybe_unused) | |
393be2e3 NK |
76 | { |
77 | return -1; | |
78 | } | |
79 | ||
b691f643 NK |
80 | /* |
81 | * Just try PT_NOTE header otherwise fails | |
82 | */ | |
83 | int filename__read_build_id(const char *filename, void *bf, size_t size) | |
84 | { | |
85 | FILE *fp; | |
86 | int ret = -1; | |
87 | bool need_swap = false; | |
88 | u8 e_ident[EI_NIDENT]; | |
89 | size_t buf_size; | |
90 | void *buf; | |
91 | int i; | |
92 | ||
93 | fp = fopen(filename, "r"); | |
94 | if (fp == NULL) | |
95 | return -1; | |
96 | ||
97 | if (fread(e_ident, sizeof(e_ident), 1, fp) != 1) | |
98 | goto out; | |
99 | ||
100 | if (memcmp(e_ident, ELFMAG, SELFMAG) || | |
101 | e_ident[EI_VERSION] != EV_CURRENT) | |
102 | goto out; | |
103 | ||
104 | need_swap = check_need_swap(e_ident[EI_DATA]); | |
105 | ||
106 | /* for simplicity */ | |
107 | fseek(fp, 0, SEEK_SET); | |
108 | ||
109 | if (e_ident[EI_CLASS] == ELFCLASS32) { | |
110 | Elf32_Ehdr ehdr; | |
111 | Elf32_Phdr *phdr; | |
112 | ||
113 | if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1) | |
114 | goto out; | |
115 | ||
116 | if (need_swap) { | |
117 | ehdr.e_phoff = bswap_32(ehdr.e_phoff); | |
118 | ehdr.e_phentsize = bswap_16(ehdr.e_phentsize); | |
119 | ehdr.e_phnum = bswap_16(ehdr.e_phnum); | |
120 | } | |
121 | ||
122 | buf_size = ehdr.e_phentsize * ehdr.e_phnum; | |
123 | buf = malloc(buf_size); | |
124 | if (buf == NULL) | |
125 | goto out; | |
126 | ||
127 | fseek(fp, ehdr.e_phoff, SEEK_SET); | |
128 | if (fread(buf, buf_size, 1, fp) != 1) | |
129 | goto out_free; | |
130 | ||
131 | for (i = 0, phdr = buf; i < ehdr.e_phnum; i++, phdr++) { | |
132 | void *tmp; | |
7ad74b41 | 133 | long offset; |
b691f643 NK |
134 | |
135 | if (need_swap) { | |
136 | phdr->p_type = bswap_32(phdr->p_type); | |
137 | phdr->p_offset = bswap_32(phdr->p_offset); | |
138 | phdr->p_filesz = bswap_32(phdr->p_filesz); | |
139 | } | |
140 | ||
141 | if (phdr->p_type != PT_NOTE) | |
142 | continue; | |
143 | ||
144 | buf_size = phdr->p_filesz; | |
7ad74b41 | 145 | offset = phdr->p_offset; |
b691f643 NK |
146 | tmp = realloc(buf, buf_size); |
147 | if (tmp == NULL) | |
148 | goto out_free; | |
149 | ||
150 | buf = tmp; | |
7ad74b41 | 151 | fseek(fp, offset, SEEK_SET); |
b691f643 NK |
152 | if (fread(buf, buf_size, 1, fp) != 1) |
153 | goto out_free; | |
154 | ||
155 | ret = read_build_id(buf, buf_size, bf, size, need_swap); | |
156 | if (ret == 0) | |
157 | ret = size; | |
158 | break; | |
159 | } | |
160 | } else { | |
161 | Elf64_Ehdr ehdr; | |
162 | Elf64_Phdr *phdr; | |
163 | ||
164 | if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1) | |
165 | goto out; | |
166 | ||
167 | if (need_swap) { | |
168 | ehdr.e_phoff = bswap_64(ehdr.e_phoff); | |
169 | ehdr.e_phentsize = bswap_16(ehdr.e_phentsize); | |
170 | ehdr.e_phnum = bswap_16(ehdr.e_phnum); | |
171 | } | |
172 | ||
173 | buf_size = ehdr.e_phentsize * ehdr.e_phnum; | |
174 | buf = malloc(buf_size); | |
175 | if (buf == NULL) | |
176 | goto out; | |
177 | ||
178 | fseek(fp, ehdr.e_phoff, SEEK_SET); | |
179 | if (fread(buf, buf_size, 1, fp) != 1) | |
180 | goto out_free; | |
181 | ||
182 | for (i = 0, phdr = buf; i < ehdr.e_phnum; i++, phdr++) { | |
183 | void *tmp; | |
7ad74b41 | 184 | long offset; |
b691f643 NK |
185 | |
186 | if (need_swap) { | |
187 | phdr->p_type = bswap_32(phdr->p_type); | |
188 | phdr->p_offset = bswap_64(phdr->p_offset); | |
189 | phdr->p_filesz = bswap_64(phdr->p_filesz); | |
190 | } | |
191 | ||
192 | if (phdr->p_type != PT_NOTE) | |
193 | continue; | |
194 | ||
195 | buf_size = phdr->p_filesz; | |
7ad74b41 | 196 | offset = phdr->p_offset; |
b691f643 NK |
197 | tmp = realloc(buf, buf_size); |
198 | if (tmp == NULL) | |
199 | goto out_free; | |
200 | ||
201 | buf = tmp; | |
7ad74b41 | 202 | fseek(fp, offset, SEEK_SET); |
b691f643 NK |
203 | if (fread(buf, buf_size, 1, fp) != 1) |
204 | goto out_free; | |
205 | ||
206 | ret = read_build_id(buf, buf_size, bf, size, need_swap); | |
207 | if (ret == 0) | |
208 | ret = size; | |
209 | break; | |
210 | } | |
211 | } | |
212 | out_free: | |
213 | free(buf); | |
214 | out: | |
215 | fclose(fp); | |
216 | return ret; | |
217 | } | |
218 | ||
219 | int sysfs__read_build_id(const char *filename, void *build_id, size_t size) | |
220 | { | |
221 | int fd; | |
222 | int ret = -1; | |
223 | struct stat stbuf; | |
224 | size_t buf_size; | |
225 | void *buf; | |
226 | ||
227 | fd = open(filename, O_RDONLY); | |
228 | if (fd < 0) | |
229 | return -1; | |
230 | ||
231 | if (fstat(fd, &stbuf) < 0) | |
232 | goto out; | |
233 | ||
234 | buf_size = stbuf.st_size; | |
235 | buf = malloc(buf_size); | |
236 | if (buf == NULL) | |
237 | goto out; | |
238 | ||
239 | if (read(fd, buf, buf_size) != (ssize_t) buf_size) | |
240 | goto out_free; | |
241 | ||
242 | ret = read_build_id(buf, buf_size, build_id, size, false); | |
243 | out_free: | |
244 | free(buf); | |
245 | out: | |
246 | close(fd); | |
247 | return ret; | |
248 | } | |
249 | ||
18425f13 | 250 | int symsrc__init(struct symsrc *ss, struct dso *dso, const char *name, |
b68e2f91 CS |
251 | enum dso_binary_type type) |
252 | { | |
253 | int fd = open(name, O_RDONLY); | |
254 | if (fd < 0) | |
18425f13 | 255 | goto out_errno; |
b68e2f91 CS |
256 | |
257 | ss->name = strdup(name); | |
258 | if (!ss->name) | |
259 | goto out_close; | |
260 | ||
779e24e2 | 261 | ss->fd = fd; |
b68e2f91 CS |
262 | ss->type = type; |
263 | ||
264 | return 0; | |
265 | out_close: | |
266 | close(fd); | |
18425f13 ACM |
267 | out_errno: |
268 | dso->load_errno = errno; | |
b68e2f91 CS |
269 | return -1; |
270 | } | |
271 | ||
1d037ca1 | 272 | bool symsrc__possibly_runtime(struct symsrc *ss __maybe_unused) |
3aafe5ae CS |
273 | { |
274 | /* Assume all sym sources could be a runtime image. */ | |
275 | return true; | |
276 | } | |
277 | ||
1d037ca1 | 278 | bool symsrc__has_symtab(struct symsrc *ss __maybe_unused) |
d26cd12b CS |
279 | { |
280 | return false; | |
281 | } | |
282 | ||
b68e2f91 CS |
283 | void symsrc__destroy(struct symsrc *ss) |
284 | { | |
74cf249d | 285 | zfree(&ss->name); |
b68e2f91 CS |
286 | close(ss->fd); |
287 | } | |
288 | ||
1d037ca1 IT |
289 | int dso__synthesize_plt_symbols(struct dso *dso __maybe_unused, |
290 | struct symsrc *ss __maybe_unused, | |
be39db9f | 291 | struct map *map __maybe_unused) |
393be2e3 NK |
292 | { |
293 | return 0; | |
294 | } | |
295 | ||
c6d8f2a4 AH |
296 | static int fd__is_64_bit(int fd) |
297 | { | |
298 | u8 e_ident[EI_NIDENT]; | |
299 | ||
300 | if (lseek(fd, 0, SEEK_SET)) | |
301 | return -1; | |
302 | ||
303 | if (readn(fd, e_ident, sizeof(e_ident)) != sizeof(e_ident)) | |
304 | return -1; | |
305 | ||
306 | if (memcmp(e_ident, ELFMAG, SELFMAG) || | |
307 | e_ident[EI_VERSION] != EV_CURRENT) | |
308 | return -1; | |
309 | ||
310 | return e_ident[EI_CLASS] == ELFCLASS64; | |
311 | } | |
312 | ||
2b5b8bb2 AH |
313 | enum dso_type dso__type_fd(int fd) |
314 | { | |
315 | Elf64_Ehdr ehdr; | |
316 | int ret; | |
317 | ||
318 | ret = fd__is_64_bit(fd); | |
319 | if (ret < 0) | |
320 | return DSO__TYPE_UNKNOWN; | |
321 | ||
322 | if (ret) | |
323 | return DSO__TYPE_64BIT; | |
324 | ||
325 | if (readn(fd, &ehdr, sizeof(ehdr)) != sizeof(ehdr)) | |
326 | return DSO__TYPE_UNKNOWN; | |
327 | ||
328 | if (ehdr.e_machine == EM_X86_64) | |
329 | return DSO__TYPE_X32BIT; | |
330 | ||
331 | return DSO__TYPE_32BIT; | |
332 | } | |
333 | ||
1d037ca1 IT |
334 | int dso__load_sym(struct dso *dso, struct map *map __maybe_unused, |
335 | struct symsrc *ss, | |
336 | struct symsrc *runtime_ss __maybe_unused, | |
1d037ca1 | 337 | int kmodule __maybe_unused) |
393be2e3 | 338 | { |
f2f30968 | 339 | unsigned char build_id[BUILD_ID_SIZE]; |
c6d8f2a4 AH |
340 | int ret; |
341 | ||
342 | ret = fd__is_64_bit(ss->fd); | |
343 | if (ret >= 0) | |
344 | dso->is_64_bit = ret; | |
b691f643 | 345 | |
b68e2f91 | 346 | if (filename__read_build_id(ss->name, build_id, BUILD_ID_SIZE) > 0) { |
b691f643 | 347 | dso__set_build_id(dso, build_id); |
b691f643 | 348 | } |
393be2e3 NK |
349 | return 0; |
350 | } | |
351 | ||
8e0cf965 AH |
352 | int file__read_maps(int fd __maybe_unused, bool exe __maybe_unused, |
353 | mapfn_t mapfn __maybe_unused, void *data __maybe_unused, | |
354 | bool *is_64_bit __maybe_unused) | |
355 | { | |
356 | return -1; | |
357 | } | |
358 | ||
afba19d9 AH |
359 | int kcore_extract__create(struct kcore_extract *kce __maybe_unused) |
360 | { | |
361 | return -1; | |
362 | } | |
363 | ||
364 | void kcore_extract__delete(struct kcore_extract *kce __maybe_unused) | |
365 | { | |
366 | } | |
367 | ||
fc1b691d AH |
368 | int kcore_copy(const char *from_dir __maybe_unused, |
369 | const char *to_dir __maybe_unused) | |
370 | { | |
371 | return -1; | |
372 | } | |
373 | ||
393be2e3 NK |
374 | void symbol__elf_init(void) |
375 | { | |
376 | } | |
a64489c5 JY |
377 | |
378 | char *dso__demangle_sym(struct dso *dso __maybe_unused, | |
379 | int kmodule __maybe_unused, | |
380 | char *elf_name __maybe_unused) | |
381 | { | |
382 | return NULL; | |
383 | } |