12 static bool check_need_swap(int file_endian)
15 u8 *check = (u8 *)&data;
19 host_endian = ELFDATA2LSB;
21 host_endian = ELFDATA2MSB;
23 return host_endian != file_endian;
26 #define NOTE_ALIGN(sz) (((sz) + 3) & ~3)
28 #define NT_GNU_BUILD_ID 3
30 static int read_build_id(void *note_data, size_t note_len, void *bf,
31 size_t size, bool need_swap)
41 while (ptr < (note_data + note_len)) {
43 size_t namesz, descsz;
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);
52 namesz = NOTE_ALIGN(nhdr->n_namesz);
53 descsz = NOTE_ALIGN(nhdr->n_descsz);
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);
63 memset(bf + sz, 0, size - sz);
73 int filename__read_debuglink(const char *filename __maybe_unused,
74 char *debuglink __maybe_unused,
75 size_t size __maybe_unused)
81 * Just try PT_NOTE header otherwise fails
83 int filename__read_build_id(const char *filename, void *bf, size_t size)
87 bool need_swap = false;
88 u8 e_ident[EI_NIDENT];
93 fp = fopen(filename, "r");
97 if (fread(e_ident, sizeof(e_ident), 1, fp) != 1)
100 if (memcmp(e_ident, ELFMAG, SELFMAG) ||
101 e_ident[EI_VERSION] != EV_CURRENT)
104 need_swap = check_need_swap(e_ident[EI_DATA]);
107 fseek(fp, 0, SEEK_SET);
109 if (e_ident[EI_CLASS] == ELFCLASS32) {
113 if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1)
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);
122 buf_size = ehdr.e_phentsize * ehdr.e_phnum;
123 buf = malloc(buf_size);
127 fseek(fp, ehdr.e_phoff, SEEK_SET);
128 if (fread(buf, buf_size, 1, fp) != 1)
131 for (i = 0, phdr = buf; i < ehdr.e_phnum; i++, phdr++) {
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);
141 if (phdr->p_type != PT_NOTE)
144 buf_size = phdr->p_filesz;
145 offset = phdr->p_offset;
146 tmp = realloc(buf, buf_size);
151 fseek(fp, offset, SEEK_SET);
152 if (fread(buf, buf_size, 1, fp) != 1)
155 ret = read_build_id(buf, buf_size, bf, size, need_swap);
164 if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1)
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);
173 buf_size = ehdr.e_phentsize * ehdr.e_phnum;
174 buf = malloc(buf_size);
178 fseek(fp, ehdr.e_phoff, SEEK_SET);
179 if (fread(buf, buf_size, 1, fp) != 1)
182 for (i = 0, phdr = buf; i < ehdr.e_phnum; i++, phdr++) {
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);
192 if (phdr->p_type != PT_NOTE)
195 buf_size = phdr->p_filesz;
196 offset = phdr->p_offset;
197 tmp = realloc(buf, buf_size);
202 fseek(fp, offset, SEEK_SET);
203 if (fread(buf, buf_size, 1, fp) != 1)
206 ret = read_build_id(buf, buf_size, bf, size, need_swap);
219 int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
227 fd = open(filename, O_RDONLY);
231 if (fstat(fd, &stbuf) < 0)
234 buf_size = stbuf.st_size;
235 buf = malloc(buf_size);
239 if (read(fd, buf, buf_size) != (ssize_t) buf_size)
242 ret = read_build_id(buf, buf_size, build_id, size, false);
250 int symsrc__init(struct symsrc *ss, struct dso *dso, const char *name,
251 enum dso_binary_type type)
253 int fd = open(name, O_RDONLY);
257 ss->name = strdup(name);
268 dso->load_errno = errno;
272 bool symsrc__possibly_runtime(struct symsrc *ss __maybe_unused)
274 /* Assume all sym sources could be a runtime image. */
278 bool symsrc__has_symtab(struct symsrc *ss __maybe_unused)
283 void symsrc__destroy(struct symsrc *ss)
289 int dso__synthesize_plt_symbols(struct dso *dso __maybe_unused,
290 struct symsrc *ss __maybe_unused,
291 struct map *map __maybe_unused)
296 static int fd__is_64_bit(int fd)
298 u8 e_ident[EI_NIDENT];
300 if (lseek(fd, 0, SEEK_SET))
303 if (readn(fd, e_ident, sizeof(e_ident)) != sizeof(e_ident))
306 if (memcmp(e_ident, ELFMAG, SELFMAG) ||
307 e_ident[EI_VERSION] != EV_CURRENT)
310 return e_ident[EI_CLASS] == ELFCLASS64;
313 enum dso_type dso__type_fd(int fd)
318 ret = fd__is_64_bit(fd);
320 return DSO__TYPE_UNKNOWN;
323 return DSO__TYPE_64BIT;
325 if (readn(fd, &ehdr, sizeof(ehdr)) != sizeof(ehdr))
326 return DSO__TYPE_UNKNOWN;
328 if (ehdr.e_machine == EM_X86_64)
329 return DSO__TYPE_X32BIT;
331 return DSO__TYPE_32BIT;
334 int dso__load_sym(struct dso *dso, struct map *map __maybe_unused,
336 struct symsrc *runtime_ss __maybe_unused,
337 int kmodule __maybe_unused)
339 unsigned char build_id[BUILD_ID_SIZE];
342 ret = fd__is_64_bit(ss->fd);
344 dso->is_64_bit = ret;
346 if (filename__read_build_id(ss->name, build_id, BUILD_ID_SIZE) > 0) {
347 dso__set_build_id(dso, build_id);
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)
359 int kcore_extract__create(struct kcore_extract *kce __maybe_unused)
364 void kcore_extract__delete(struct kcore_extract *kce __maybe_unused)
368 int kcore_copy(const char *from_dir __maybe_unused,
369 const char *to_dir __maybe_unused)
374 void symbol__elf_init(void)
378 char *dso__demangle_sym(struct dso *dso __maybe_unused,
379 int kmodule __maybe_unused,
380 char *elf_name __maybe_unused)