int dwarf_init(int fd, int mode, Dwarf_Handler errhand, Dwarf_Ptr errarg, Dwarf_Debug *ret_dbg, Dwarf_Error *error) { Dwarf_Debug dbg; Elf *elf; int ret; if (fd < 0 || ret_dbg == NULL) { DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT); return (DW_DLV_ERROR); } if (mode != DW_DLC_READ) { DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT); return (DW_DLV_ERROR); } if (elf_version(EV_CURRENT) == EV_NONE) { DWARF_SET_ELF_ERROR(NULL, error); return (DW_DLV_ERROR); } if ((elf = elf_begin(fd, ELF_C_READ, NULL)) == NULL) { DWARF_SET_ELF_ERROR(NULL, error); return (DW_DLV_ERROR); } if (_dwarf_alloc(&dbg, mode, error) != DW_DLE_NONE) return (DW_DLV_ERROR); if (_dwarf_elf_init(dbg, elf, error) != DW_DLE_NONE) { free(dbg); return (DW_DLV_ERROR); } if ((ret = _dwarf_init(dbg, 0, errhand, errarg, error)) != DW_DLE_NONE) { _dwarf_elf_deinit(dbg); free(dbg); if (ret == DW_DLE_DEBUG_INFO_NULL) return (DW_DLV_NO_ENTRY); else return (DW_DLV_ERROR); } *ret_dbg = dbg; return (DW_DLV_OK); }
static int _dwarf_elf_relocate(Dwarf_Debug dbg, Elf *elf, Dwarf_Elf_Data *ed, size_t shndx, size_t symtab, Elf_Data *symtab_data, Dwarf_Error *error) { GElf_Ehdr eh; GElf_Shdr sh; Elf_Scn *scn; Elf_Data *rel; int elferr; if (symtab == 0 || symtab_data == NULL) return (DW_DLE_NONE); if (gelf_getehdr(elf, &eh) == NULL) { DWARF_SET_ELF_ERROR(dbg, error); return (DW_DLE_ELF); } scn = NULL; (void) elf_errno(); while ((scn = elf_nextscn(elf, scn)) != NULL) { if (gelf_getshdr(scn, &sh) == NULL) { DWARF_SET_ELF_ERROR(dbg, error); return (DW_DLE_ELF); } if (sh.sh_type != SHT_RELA || sh.sh_size == 0) continue; if (sh.sh_info == shndx && sh.sh_link == symtab) { if ((rel = elf_getdata(scn, NULL)) == NULL) { elferr = elf_errno(); if (elferr != 0) { _DWARF_SET_ERROR(NULL, error, DW_DLE_ELF, elferr); return (DW_DLE_ELF); } else return (DW_DLE_NONE); } ed->ed_alloc = malloc(ed->ed_data->d_size); if (ed->ed_alloc == NULL) { DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY); return (DW_DLE_MEMORY); } memcpy(ed->ed_alloc, ed->ed_data->d_buf, ed->ed_data->d_size); _dwarf_elf_apply_reloc(dbg, ed->ed_alloc, rel, symtab_data, eh.e_ident[EI_DATA]); return (DW_DLE_NONE); } } elferr = elf_errno(); if (elferr != 0) { DWARF_SET_ELF_ERROR(dbg, error); return (DW_DLE_ELF); } return (DW_DLE_NONE); }
int _dwarf_elf_init(Dwarf_Debug dbg, Elf *elf, Dwarf_Error *error) { Dwarf_Obj_Access_Interface *iface; Dwarf_Elf_Object *e; const char *name; GElf_Shdr sh; Elf_Scn *scn; Elf_Data *symtab_data; size_t symtab_ndx; int elferr, i, j, n, ret; ret = DW_DLE_NONE; if ((iface = calloc(1, sizeof(*iface))) == NULL) { DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY); return (DW_DLE_MEMORY); } if ((e = calloc(1, sizeof(*e))) == NULL) { free(iface); DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY); return (DW_DLE_MEMORY); } e->eo_elf = elf; e->eo_methods.get_section_info = _dwarf_elf_get_section_info; e->eo_methods.get_byte_order = _dwarf_elf_get_byte_order; e->eo_methods.get_length_size = _dwarf_elf_get_length_size; e->eo_methods.get_pointer_size = _dwarf_elf_get_pointer_size; e->eo_methods.get_section_count = _dwarf_elf_get_section_count; e->eo_methods.load_section = _dwarf_elf_load_section; iface->object = e; iface->methods = &e->eo_methods; dbg->dbg_iface = iface; if (gelf_getehdr(elf, &e->eo_ehdr) == NULL) { DWARF_SET_ELF_ERROR(dbg, error); ret = DW_DLE_ELF; goto fail_cleanup; } dbg->dbg_machine = e->eo_ehdr.e_machine; if (!elf_getshstrndx(elf, &e->eo_strndx)) { DWARF_SET_ELF_ERROR(dbg, error); ret = DW_DLE_ELF; goto fail_cleanup; } n = 0; symtab_ndx = 0; symtab_data = NULL; scn = NULL; (void) elf_errno(); while ((scn = elf_nextscn(elf, scn)) != NULL) { if (gelf_getshdr(scn, &sh) == NULL) { DWARF_SET_ELF_ERROR(dbg, error); ret = DW_DLE_ELF; goto fail_cleanup; } if ((name = elf_strptr(elf, e->eo_strndx, sh.sh_name)) == NULL) { DWARF_SET_ELF_ERROR(dbg, error); ret = DW_DLE_ELF; goto fail_cleanup; } if (!strcmp(name, ".symtab")) { symtab_ndx = elf_ndxscn(scn); if ((symtab_data = elf_getdata(scn, NULL)) == NULL) { elferr = elf_errno(); if (elferr != 0) { _DWARF_SET_ERROR(NULL, error, DW_DLE_ELF, elferr); ret = DW_DLE_ELF; goto fail_cleanup; } } continue; } for (i = 0; debug_name[i] != NULL; i++) { if (!strcmp(name, debug_name[i])) n++; } } elferr = elf_errno(); if (elferr != 0) { DWARF_SET_ELF_ERROR(dbg, error); return (DW_DLE_ELF); } e->eo_seccnt = n; if (n == 0) return (DW_DLE_NONE); if ((e->eo_data = calloc(n, sizeof(Dwarf_Elf_Data))) == NULL || (e->eo_shdr = calloc(n, sizeof(GElf_Shdr))) == NULL) { DWARF_SET_ERROR(NULL, error, DW_DLE_MEMORY); ret = DW_DLE_MEMORY; goto fail_cleanup; } scn = NULL; j = 0; while ((scn = elf_nextscn(elf, scn)) != NULL && j < n) { if (gelf_getshdr(scn, &sh) == NULL) { DWARF_SET_ELF_ERROR(dbg, error); ret = DW_DLE_ELF; goto fail_cleanup; } memcpy(&e->eo_shdr[j], &sh, sizeof(sh)); if ((name = elf_strptr(elf, e->eo_strndx, sh.sh_name)) == NULL) { DWARF_SET_ELF_ERROR(dbg, error); ret = DW_DLE_ELF; goto fail_cleanup; } for (i = 0; debug_name[i] != NULL; i++) { if (strcmp(name, debug_name[i])) continue; (void) elf_errno(); if ((e->eo_data[j].ed_data = elf_getdata(scn, NULL)) == NULL) { elferr = elf_errno(); if (elferr != 0) { _DWARF_SET_ERROR(dbg, error, DW_DLE_ELF, elferr); ret = DW_DLE_ELF; goto fail_cleanup; } } if (_libdwarf.applyrela) { if (_dwarf_elf_relocate(dbg, elf, &e->eo_data[j], elf_ndxscn(scn), symtab_ndx, symtab_data, error) != DW_DLE_NONE) goto fail_cleanup; } j++; } } assert(j == n); return (DW_DLE_NONE); fail_cleanup: _dwarf_elf_deinit(dbg); return (ret); }