| 42,38 → 42,65 |
|---|
| #include <symbol.h> |
| #include <elf.h> |
| |
| /* |
| * Hash tables are 32-bit (elf_word) even for 64-bit ELF files. |
| */ |
| static elf_word elf_hash(const unsigned char *name) |
| { |
| elf_word h = 0, g; |
| |
| while (*name) { |
| h = (h << 4) + *name++; |
| g = h & 0xf0000000; |
| if (g != 0) h ^= g >> 24; |
| h &= ~g; |
| } |
| |
| return h; |
| } |
| |
| static elf_symbol_t *def_find_in_module(char *name, module_t *m) |
| { |
| elf_symbol_t *sym_table; |
| elf_symbol_t *sym; |
| elf_symbol_t *s, *sym; |
| elf_word nbucket; |
| elf_word nchain; |
| size_t i; |
| elf_word i; |
| char *s_name; |
| char *module_name; |
| elf_word bucket; |
| |
| module_name = m->dyn.soname; |
| // module_name = m->dyn.soname; |
| // printf("def_find_in_module('%s', %s)\n", name, module_name); |
| |
| sym_table = m->dyn.sym_tab; |
| nbucket = m->dyn.hash[0]; |
| nchain = m->dyn.hash[1]; |
| |
| for (i = 0; i < nchain; ++i) { |
| sym = &sym_table[i]; |
| s_name = m->dyn.str_tab + sym->st_name; |
| // printf("cmp sym '%s'\n", s_name); |
| bucket = elf_hash((unsigned char *)name) % nbucket; |
| i = m->dyn.hash[2 + bucket]; |
| |
| sym = NULL; |
| while (i != STN_UNDEF) { |
| s = &sym_table[i]; |
| s_name = m->dyn.str_tab + s->st_name; |
| |
| if (strcmp(name, s_name) == 0) { |
| // printf("name match\n"); |
| if (sym->st_shndx != SHN_UNDEF) { |
| // printf("definition found. idx=%d\n", i); |
| return sym; |
| } else { |
| // printf("not a definition\n"); |
| } |
| sym = s; |
| break; |
| } |
| |
| i = m->dyn.hash[2 + nbucket + i]; |
| } |
| |
| // printf("not found\n"); |
| return NULL; |
| if (!sym) |
| return NULL; /* Not found */ |
| |
| if (sym->st_shndx == SHN_UNDEF) { |
| /* Not a definition */ |
| return NULL; |
| } |
| |
| return sym; /* Found */ |
| } |
| |
| |
| 95,5 → 122,15 |
|---|
| return NULL; |
| } |
| |
| uintptr_t symbol_get_addr(elf_symbol_t *sym, module_t *m) |
| { |
| if (sym->st_shndx == SHN_ABS) { |
| /* Do not add bias to absolute symbols */ |
| return sym->st_value; |
| } else { |
| return sym->st_value + m->bias; |
| } |
| } |
| |
| /** @} |
| */ |