libkern/kxld/kxld_kext.c

67     KXLDObject *kext;
80     const KXLDObject *kext, const KXLDObject *interface,
84 static kern_return_t export_symbols(const KXLDObject *kext,
88 static kern_return_t create_vtables(KXLDKext *kext,
90 static kern_return_t get_vtable_syms_from_smcp(KXLDKext *kext,
94 static kern_return_t resolve_symbols(KXLDKext *kext,
97 static kern_return_t patch_vtables(KXLDKext *kext, KXLDDict *patched_vtables,
100     KXLDKext *kext, KXLDSym *super_metaclass_pointer_sym);
101 static kern_return_t create_vtable_index(KXLDKext *kext);
103 static kern_return_t validate_symbols(KXLDKext *kext);
116 kxld_kext_init(KXLDKext *kext, KXLDObject *kext_object,
121     check(kext);
124     kext->kext = kext_object;
127         kext->interface = interface_object;
129         rval = kxld_object_index_symbols_by_name(kext->kext);
141 kxld_kext_clear(KXLDKext *kext)
146     check(kext);
148     for (i = 0; i < kext->vtables.nitems; ++i) {
149         vtable = kxld_array_get_item(&kext->vtables, i);
152     kxld_array_reset(&kext->vtables);
153     kxld_dict_clear(&kext->vtable_index);
155     kext->kext = NULL;
156     kext->interface = NULL;
157     kext->vtables_created = FALSE;
158     kext->vtable_index_created = FALSE;
165 kxld_kext_deinit(KXLDKext *kext)
170     check(kext);
172     for (i = 0; i < kext->vtables.maxitems; ++i) {
173         vtable = kxld_array_get_slot(&kext->vtables, i);
176     kxld_array_deinit(&kext->vtables);
177     kxld_dict_deinit(&kext->vtable_index);
179     bzero(kext, sizeof(*kext));
185 kxld_kext_export_symbols(const KXLDKext *kext,
192     check(kext);
194     if (kext->interface) {
195         rval = export_symbols_through_interface(kext->kext, kext->interface,
200         rval = export_symbols(kext->kext, defined_symbols_by_name,
213 export_symbols_through_interface(const KXLDObject *kext,
224     check(kext);
227     kext_symtab = kxld_object_get_symtab(kext);
240                     kxld_object_get_name(interface), kxld_object_get_name(kext),
259                     kxld_object_get_name(interface), kxld_object_get_name(kext),
300 export_symbols(const KXLDObject *kext, KXLDDict *defined_symbols_by_name,
307     (void) kxld_symtab_iterator_init(&iter, kxld_object_get_symtab(kext),
330 kxld_kext_export_vtables(KXLDKext *kext, const KXLDDict *defined_cxx_symbols,
337     check(kext);
342     rval = create_vtables(kext, defined_cxx_symbols, defined_symbols);
345     for (i = 0; i < kext->vtables.nitems; ++i) {
346         vtable = kxld_array_get_item(&kext->vtables, i);
360 kxld_kext_get_vmsize(const KXLDKext *kext,
363     (void) kxld_object_get_vmsize(kext->kext, header_size, vmsize);
369 kxld_kext_set_linked_object_size(KXLDKext *kext, u_long vmsize)
371     (void) kxld_object_set_linked_object_size(kext->kext, vmsize);
378 kxld_kext_export_linked_object(const KXLDKext *kext,
385         kxld_object_get_symtab(kext->kext), KXLD_KMOD_INFO_SYMBOL);
391     rval = kxld_object_export_linked_object(kext->kext, linked_object);
399 kxld_kext_relocate(KXLDKext *kext, kxld_addr_t link_address,
405     check(kext);
417     rval = kxld_object_index_cxx_symbols_by_value(kext->kext);
420     rval = kxld_object_index_symbols_by_name(kext->kext);
423     rval = kxld_object_relocate(kext->kext, link_address);
426     rval = resolve_symbols(kext, defined_symbols, obsolete_symbols);
429     rval = create_vtables(kext, defined_cxx_symbols, /* defined_symbols */ NULL);
432     rval = patch_vtables(kext, patched_vtables, defined_symbols);
435     rval = validate_symbols(kext);
438     rval = kxld_object_process_relocations(kext->kext, patched_vtables);
449 * it will look in the kext's symbol table for vtable symbols.
461 create_vtables(KXLDKext *kext, const KXLDDict *defined_cxx_symbols,
475     if (kext->vtables_created) {
480     symtab = kxld_object_get_symtab(kext->kext);
482     if (kxld_object_is_linked(kext->kext)) {
497     rval = kxld_array_init(&kext->vtables, sizeof(KXLDVTable), nvtables);
501         if (kxld_object_is_linked(kext->kext)) {
506             rval = get_vtable_syms_from_smcp(kext, defined_symbols, sym,
511         vtable = kxld_array_get_item(&kext->vtables, i++);
512         rval = kxld_vtable_init(vtable, vtable_sym, kext->kext,
520         if (!kxld_object_is_linked(kext->kext)) {
522                 meta_vtable = kxld_array_get_item(&kext->vtables, i++);
524                     kext->kext, defined_cxx_symbols);
527                 kxld_array_resize(&kext->vtables, --nvtables);
532     require_action(i == kext->vtables.nitems, finish,
535     kext->vtables_created = TRUE;
544 get_vtable_syms_from_smcp(KXLDKext *kext, const KXLDDict *defined_symbols,
560     check(kext);
564     require(!kxld_object_is_kernel(kext->kext), finish);
566     symtab = kxld_object_get_symtab(kext->kext);
602         if (kxld_object_target_supports_strict_patching(kext->kext)) {
631 resolve_symbols(KXLDKext *kext, const KXLDDict *defined_symbols,
645     check(kext->kext);
649     symtab = kxld_object_get_symtab(kext->kext);
651     /* Check if the kext tests for weak symbols */
691                 if (kxld_object_target_supports_common_symbols(kext->kext)) {
697                          "Use -fno-common to build your kext. "
727                         "This kext uses obsolete symbol %s.",
734                 /* Make sure that the kext has referenced gOSKextUnresolved.
739                       "This kext has weak references but does not test for "
795 patch_vtables(KXLDKext *kext, KXLDDict *patched_vtables,
821     check(kext);
824     symtab = kxld_object_get_symtab(kext->kext);
826     rval = create_vtable_index(kext);
852             vtable = kxld_dict_find(&kext->vtable_index, vtable_name);
861                     kext, super_metaclass_pointer);
879                     unpatched_super_vtable = kxld_dict_find(&kext->vtable_index,
924                 rval = kxld_vtable_patch(vtable, super_vtable, kext->kext);
940                 vtable = kxld_dict_find(&kext->vtable_index, vtable_name);
963                 rval = kxld_vtable_patch(vtable, super_vtable, kext->kext);
991 create_vtable_index(KXLDKext *kext)
997     if (kext->vtable_index_created) {
1003     rval = kxld_dict_init(&kext->vtable_index, kxld_dict_string_hash,
1004         kxld_dict_string_cmp, kext->vtables.nitems);
1007     for (i = 0; i < kext->vtables.nitems; ++i) {
1008         vtable = kxld_array_get_item(&kext->vtables, i);
1009         rval = kxld_dict_insert(&kext->vtable_index, vtable->name, vtable);
1013     kext->vtable_index_created = TRUE;
1022 get_metaclass_symbol_from_super_meta_class_pointer_symbol(KXLDKext *kext,
1030     check(kext);
1034     reloc = kxld_object_get_reloc_at_symbol(kext->kext,
1039     sect = kxld_object_get_section_by_index(kext->kext,
1044     metaclass = kxld_object_get_symbol_of_reloc(kext->kext, reloc, sect);
1052 validate_symbols(KXLDKext *kext)
1062     kxld_symtab_iterator_init(&iter, kxld_object_get_symtab(kext->kext),
1068                 "The following symbols are unresolved for this kext:");