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