| #include "symbol.h" |
| #include "util.h" |
| |
| #include <stdio.h> |
| #include <fcntl.h> |
| #include <string.h> |
| #include <byteswap.h> |
| #include <sys/stat.h> |
| |
| |
| static bool check_need_swap(int file_endian) |
| { |
| const int data = 1; |
| u8 *check = (u8 *)&data; |
| int host_endian; |
| |
| if (check[0] == 1) |
| host_endian = ELFDATA2LSB; |
| else |
| host_endian = ELFDATA2MSB; |
| |
| return host_endian != file_endian; |
| } |
| |
| #define NOTE_ALIGN(sz) (((sz) + 3) & ~3) |
| |
| #define NT_GNU_BUILD_ID 3 |
| |
| static int read_build_id(void *note_data, size_t note_len, void *bf, |
| size_t size, bool need_swap) |
| { |
| struct { |
| u32 n_namesz; |
| u32 n_descsz; |
| u32 n_type; |
| } *nhdr; |
| void *ptr; |
| |
| ptr = note_data; |
| while (ptr < (note_data + note_len)) { |
| const char *name; |
| size_t namesz, descsz; |
| |
| nhdr = ptr; |
| if (need_swap) { |
| nhdr->n_namesz = bswap_32(nhdr->n_namesz); |
| nhdr->n_descsz = bswap_32(nhdr->n_descsz); |
| nhdr->n_type = bswap_32(nhdr->n_type); |
| } |
| |
| namesz = NOTE_ALIGN(nhdr->n_namesz); |
| descsz = NOTE_ALIGN(nhdr->n_descsz); |
| |
| ptr += sizeof(*nhdr); |
| name = ptr; |
| ptr += namesz; |
| if (nhdr->n_type == NT_GNU_BUILD_ID && |
| nhdr->n_namesz == sizeof("GNU")) { |
| if (memcmp(name, "GNU", sizeof("GNU")) == 0) { |
| size_t sz = min(size, descsz); |
| memcpy(bf, ptr, sz); |
| memset(bf + sz, 0, size - sz); |
| return 0; |
| } |
| } |
| ptr += descsz; |
| } |
| |
| return -1; |
| } |
| |
| int filename__read_debuglink(const char *filename __maybe_unused, |
| char *debuglink __maybe_unused, |
| size_t size __maybe_unused) |
| { |
| return -1; |
| } |
| |
| /* |
| * Just try PT_NOTE header otherwise fails |
| */ |
| int filename__read_build_id(const char *filename, void *bf, size_t size) |
| { |
| FILE *fp; |
| int ret = -1; |
| bool need_swap = false; |
| u8 e_ident[EI_NIDENT]; |
| size_t buf_size; |
| void *buf; |
| int i; |
| |
| fp = fopen(filename, "r"); |
| if (fp == NULL) |
| return -1; |
| |
| if (fread(e_ident, sizeof(e_ident), 1, fp) != 1) |
| goto out; |
| |
| if (memcmp(e_ident, ELFMAG, SELFMAG) || |
| e_ident[EI_VERSION] != EV_CURRENT) |
| goto out; |
| |
| need_swap = check_need_swap(e_ident[EI_DATA]); |
| |
| /* for simplicity */ |
| fseek(fp, 0, SEEK_SET); |
| |
| if (e_ident[EI_CLASS] == ELFCLASS32) { |
| Elf32_Ehdr ehdr; |
| Elf32_Phdr *phdr; |
| |
| if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1) |
| goto out; |
| |
| if (need_swap) { |
| ehdr.e_phoff = bswap_32(ehdr.e_phoff); |
| ehdr.e_phentsize = bswap_16(ehdr.e_phentsize); |
| ehdr.e_phnum = bswap_16(ehdr.e_phnum); |
| } |
| |
| buf_size = ehdr.e_phentsize * ehdr.e_phnum; |
| buf = malloc(buf_size); |
| if (buf == NULL) |
| goto out; |
| |
| fseek(fp, ehdr.e_phoff, SEEK_SET); |
| if (fread(buf, buf_size, 1, fp) != 1) |
| goto out_free; |
| |
| for (i = 0, phdr = buf; i < ehdr.e_phnum; i++, phdr++) { |
| void *tmp; |
| |
| if (need_swap) { |
| phdr->p_type = bswap_32(phdr->p_type); |
| phdr->p_offset = bswap_32(phdr->p_offset); |
| phdr->p_filesz = bswap_32(phdr->p_filesz); |
| } |
| |
| if (phdr->p_type != PT_NOTE) |
| continue; |
| |
| buf_size = phdr->p_filesz; |
| tmp = realloc(buf, buf_size); |
| if (tmp == NULL) |
| goto out_free; |
| |
| buf = tmp; |
| fseek(fp, phdr->p_offset, SEEK_SET); |
| if (fread(buf, buf_size, 1, fp) != 1) |
| goto out_free; |
| |
| ret = read_build_id(buf, buf_size, bf, size, need_swap); |
| if (ret == 0) |
| ret = size; |
| break; |
| } |
| } else { |
| Elf64_Ehdr ehdr; |
| Elf64_Phdr *phdr; |
| |
| if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1) |
| goto out; |
| |
| if (need_swap) { |
| ehdr.e_phoff = bswap_64(ehdr.e_phoff); |
| ehdr.e_phentsize = bswap_16(ehdr.e_phentsize); |
| ehdr.e_phnum = bswap_16(ehdr.e_phnum); |
| } |
| |
| buf_size = ehdr.e_phentsize * ehdr.e_phnum; |
| buf = malloc(buf_size); |
| if (buf == NULL) |
| goto out; |
| |
| fseek(fp, ehdr.e_phoff, SEEK_SET); |
| if (fread(buf, buf_size, 1, fp) != 1) |
| goto out_free; |
| |
| for (i = 0, phdr = buf; i < ehdr.e_phnum; i++, phdr++) { |
| void *tmp; |
| |
| if (need_swap) { |
| phdr->p_type = bswap_32(phdr->p_type); |
| phdr->p_offset = bswap_64(phdr->p_offset); |
| phdr->p_filesz = bswap_64(phdr->p_filesz); |
| } |
| |
| if (phdr->p_type != PT_NOTE) |
| continue; |
| |
| buf_size = phdr->p_filesz; |
| tmp = realloc(buf, buf_size); |
| if (tmp == NULL) |
| goto out_free; |
| |
| buf = tmp; |
| fseek(fp, phdr->p_offset, SEEK_SET); |
| if (fread(buf, buf_size, 1, fp) != 1) |
| goto out_free; |
| |
| ret = read_build_id(buf, buf_size, bf, size, need_swap); |
| if (ret == 0) |
| ret = size; |
| break; |
| } |
| } |
| out_free: |
| free(buf); |
| out: |
| fclose(fp); |
| return ret; |
| } |
| |
| int sysfs__read_build_id(const char *filename, void *build_id, size_t size) |
| { |
| int fd; |
| int ret = -1; |
| struct stat stbuf; |
| size_t buf_size; |
| void *buf; |
| |
| fd = open(filename, O_RDONLY); |
| if (fd < 0) |
| return -1; |
| |
| if (fstat(fd, &stbuf) < 0) |
| goto out; |
| |
| buf_size = stbuf.st_size; |
| buf = malloc(buf_size); |
| if (buf == NULL) |
| goto out; |
| |
| if (read(fd, buf, buf_size) != (ssize_t) buf_size) |
| goto out_free; |
| |
| ret = read_build_id(buf, buf_size, build_id, size, false); |
| out_free: |
| free(buf); |
| out: |
| close(fd); |
| return ret; |
| } |
| |
| int symsrc__init(struct symsrc *ss, struct dso *dso __maybe_unused, |
| const char *name, |
| enum dso_binary_type type) |
| { |
| int fd = open(name, O_RDONLY); |
| if (fd < 0) |
| return -1; |
| |
| ss->name = strdup(name); |
| if (!ss->name) |
| goto out_close; |
| |
| ss->fd = fd; |
| ss->type = type; |
| |
| return 0; |
| out_close: |
| close(fd); |
| return -1; |
| } |
| |
| bool symsrc__possibly_runtime(struct symsrc *ss __maybe_unused) |
| { |
| /* Assume all sym sources could be a runtime image. */ |
| return true; |
| } |
| |
| bool symsrc__has_symtab(struct symsrc *ss __maybe_unused) |
| { |
| return false; |
| } |
| |
| void symsrc__destroy(struct symsrc *ss) |
| { |
| zfree(&ss->name); |
| close(ss->fd); |
| } |
| |
| int dso__synthesize_plt_symbols(struct dso *dso __maybe_unused, |
| struct symsrc *ss __maybe_unused, |
| struct map *map __maybe_unused, |
| symbol_filter_t filter __maybe_unused) |
| { |
| return 0; |
| } |
| |
| static int fd__is_64_bit(int fd) |
| { |
| u8 e_ident[EI_NIDENT]; |
| |
| if (lseek(fd, 0, SEEK_SET)) |
| return -1; |
| |
| if (readn(fd, e_ident, sizeof(e_ident)) != sizeof(e_ident)) |
| return -1; |
| |
| if (memcmp(e_ident, ELFMAG, SELFMAG) || |
| e_ident[EI_VERSION] != EV_CURRENT) |
| return -1; |
| |
| return e_ident[EI_CLASS] == ELFCLASS64; |
| } |
| |
| int dso__load_sym(struct dso *dso, struct map *map __maybe_unused, |
| struct symsrc *ss, |
| struct symsrc *runtime_ss __maybe_unused, |
| symbol_filter_t filter __maybe_unused, |
| int kmodule __maybe_unused) |
| { |
| unsigned char *build_id[BUILD_ID_SIZE]; |
| int ret; |
| |
| ret = fd__is_64_bit(ss->fd); |
| if (ret >= 0) |
| dso->is_64_bit = ret; |
| |
| if (filename__read_build_id(ss->name, build_id, BUILD_ID_SIZE) > 0) { |
| dso__set_build_id(dso, build_id); |
| return 1; |
| } |
| return 0; |
| } |
| |
| int file__read_maps(int fd __maybe_unused, bool exe __maybe_unused, |
| mapfn_t mapfn __maybe_unused, void *data __maybe_unused, |
| bool *is_64_bit __maybe_unused) |
| { |
| return -1; |
| } |
| |
| int kcore_extract__create(struct kcore_extract *kce __maybe_unused) |
| { |
| return -1; |
| } |
| |
| void kcore_extract__delete(struct kcore_extract *kce __maybe_unused) |
| { |
| } |
| |
| int kcore_copy(const char *from_dir __maybe_unused, |
| const char *to_dir __maybe_unused) |
| { |
| return -1; |
| } |
| |
| void symbol__elf_init(void) |
| { |
| } |