/* Various symbol table handling functions, including symbol lookup */
-
-/*
- * This is the start of the linked list that describes all of the files present
- * in the system with pointers to all of the symbol, string, and hash tables,
- * as well as all of the other good stuff in the binary.
- */
-struct elf_resolve *_dl_loaded_modules = NULL;
-
/*
* This is the list of modules that are loaded when the image is first
* started. As we add more via dlopen, they get added into other
struct elf_resolve *tpnt;
int i;
- if (!_dl_loaded_modules) {
- tpnt = _dl_loaded_modules = (struct elf_resolve *) _dl_malloc(sizeof(struct elf_resolve));
- _dl_memset(tpnt, 0, sizeof(struct elf_resolve));
- } else {
- tpnt = _dl_loaded_modules;
- while (tpnt->next)
- tpnt = tpnt->next;
- tpnt->next = (struct elf_resolve *) _dl_malloc(sizeof(struct elf_resolve));
- _dl_memset(tpnt->next, 0, sizeof(struct elf_resolve));
- tpnt->next->prev = tpnt;
- tpnt = tpnt->next;
+ tpnt = _dl_malloc(sizeof(struct elf_resolve));
+ _dl_memset(tpnt, 0, sizeof(struct elf_resolve));
+
+ if (!_dl_loaded_modules)
+ _dl_loaded_modules = tpnt;
+ else {
+ struct elf_resolve *t = _dl_loaded_modules;
+ while (t->next)
+ t = t->next;
+ t->next = tpnt;
+ t->next->prev = t;
+ tpnt = t->next;
}
tpnt->next = NULL;
tpnt->dynamic_addr = (ElfW(Dyn) *)dynamic_addr;
tpnt->libtype = loaded_file;
+#ifdef __DSBT__
+ if (dynamic_info[DT_DSBT_BASE_IDX] != 0)
+ tpnt->dsbt_table = (void *)dynamic_info[DT_DSBT_BASE_IDX];
+ if (dynamic_info[DT_DSBT_SIZE_IDX] != 0)
+ tpnt->dsbt_size = dynamic_info[DT_DSBT_SIZE_IDX];
+ if (dynamic_info[DT_DSBT_INDEX_IDX] != 0)
+ tpnt->dsbt_index = dynamic_info[DT_DSBT_INDEX_IDX];
+#endif /* __DSBT__ */
+
#ifdef __LDSO_GNU_HASH_SUPPORT__
if (dynamic_info[DT_GNU_HASH_IDX] != 0) {
Elf32_Word *hash32 = (Elf_Symndx*)dynamic_info[DT_GNU_HASH_IDX];
tpnt->chains = hash_addr;
}
tpnt->loadaddr = loadaddr;
- tpnt->mapaddr = DL_RELOC_ADDR(loadaddr, 0);
for (i = 0; i < DYNAMIC_SIZE; i++)
tpnt->dynamic_info[i] = dynamic_info[i];
return tpnt;
static __attribute_noinline__ const ElfW(Sym) *
check_match (const ElfW(Sym) *sym, char *strtab, const char* undef_name, int type_class)
{
+
+#if defined(USE_TLS) && USE_TLS
+ if ((sym->st_value == 0 && (ELF_ST_TYPE(sym->st_info) != STT_TLS))
+ || (type_class & (sym->st_shndx == SHN_UNDEF)))
+ /* No value or undefined symbol itself */
+ return NULL;
+
+ if (ELF_ST_TYPE(sym->st_info) > STT_FUNC
+ && ELF_ST_TYPE(sym->st_info) != STT_COMMON
+ && ELF_ST_TYPE(sym->st_info) != STT_TLS)
+ /* Ignore all but STT_NOTYPE, STT_OBJECT, STT_FUNC and STT_COMMON
+ * entries (and STT_TLS if TLS is supported) since these
+ * are no code/data definitions.
+ */
+ return NULL;
+#else
if (type_class & (sym->st_shndx == SHN_UNDEF))
/* undefined symbol itself */
return NULL;
* code/data definitions
*/
return NULL;
-
+#endif
+#ifdef ARCH_SKIP_RELOC
+ if (ARCH_SKIP_RELOC(type_class, sym))
+ return NULL;
+#endif
if (_dl_strcmp(strtab + sym->st_name, undef_name) != 0)
return NULL;
* This function resolves externals, and this is either called when we process
* relocations or when we call an entry in the PLT table for the first time.
*/
-char *_dl_lookup_hash(const char *name, struct dyn_elf *rpnt,
- struct elf_resolve *mytpnt, int type_class
-#ifdef __FDPIC__
- , struct elf_resolve **tpntp
-#endif
- )
+char *_dl_find_hash(const char *name, struct r_scope_elem *scope, struct elf_resolve *mytpnt,
+ int type_class, struct symbol_ref *sym_ref)
{
struct elf_resolve *tpnt = NULL;
ElfW(Sym) *symtab;
+ int i = 0;
unsigned long elf_hash_number = 0xffffffff;
const ElfW(Sym) *sym = NULL;
- const ElfW(Sym) *weak_sym = 0;
- struct elf_resolve *weak_tpnt = 0;
+ char *weak_result = NULL;
+ struct r_scope_elem *loop_scope;
#ifdef __LDSO_GNU_HASH_SUPPORT__
unsigned long gnu_hash_number = _dl_gnu_hash((const unsigned char *)name);
#endif
- for (; rpnt; rpnt = rpnt->next) {
- tpnt = rpnt->dyn;
-
- if (!(tpnt->rtld_flags & RTLD_GLOBAL) && mytpnt) {
- if (mytpnt == tpnt)
- ;
- else {
- struct init_fini_list *tmp;
-
- for (tmp = mytpnt->rtld_local; tmp; tmp = tmp->next) {
- if (tmp->tpnt == tpnt)
- break;
+ if ((sym_ref) && (sym_ref->sym) && (ELF32_ST_VISIBILITY(sym_ref->sym->st_other) == STV_PROTECTED)) {
+ sym = sym_ref->sym;
+ if (mytpnt)
+ tpnt = mytpnt;
+ } else
+ for (loop_scope = scope; loop_scope && !sym; loop_scope = loop_scope->next) {
+ for (i = 0; i < loop_scope->r_nlist; i++) {
+ tpnt = loop_scope->r_list[i];
+
+ if (!(tpnt->rtld_flags & RTLD_GLOBAL) && mytpnt) {
+ if (mytpnt == tpnt)
+ ;
+ else {
+ struct init_fini_list *tmp;
+
+ for (tmp = mytpnt->rtld_local; tmp; tmp = tmp->next) {
+ if (tmp->tpnt == tpnt)
+ break;
+ }
+ if (!tmp)
+ continue;
}
- if (!tmp)
- continue;
}
- }
- /* Don't search the executable when resolving a copy reloc. */
- if ((type_class & ELF_RTYPE_CLASS_COPY) && tpnt->libtype == elf_executable)
- continue;
+ /* Don't search the executable when resolving a copy reloc. */
+ if ((type_class & ELF_RTYPE_CLASS_COPY) && tpnt->libtype == elf_executable)
+ continue;
- /* If the hash table is empty there is nothing to do here. */
- if (tpnt->nbucket == 0)
- continue;
+ /* If the hash table is empty there is nothing to do here. */
+ if (tpnt->nbucket == 0)
+ continue;
- symtab = (ElfW(Sym) *) (intptr_t) (tpnt->dynamic_info[DT_SYMTAB]);
+ symtab = (ElfW(Sym) *) (intptr_t) (tpnt->dynamic_info[DT_SYMTAB]);
#ifdef __LDSO_GNU_HASH_SUPPORT__
- /* Prefer GNU hash style, if any */
- if (tpnt->l_gnu_bitmask) {
- sym = _dl_lookup_gnu_hash(tpnt, symtab, gnu_hash_number, name, type_class);
- if (sym != NULL)
- /* If sym has been found, do not search further */
- break;
- } else {
+ /* Prefer GNU hash style, if any */
+ if (tpnt->l_gnu_bitmask) {
+ sym = _dl_lookup_gnu_hash(tpnt, symtab, gnu_hash_number, name, type_class);
+ if (sym != NULL)
+ /* If sym has been found, do not search further */
+ break;
+ } else {
#endif
- /* Use the old SysV-style hash table */
+ /* Use the old SysV-style hash table */
- /* Calculate the old sysv hash number only once */
- if (elf_hash_number == 0xffffffff)
- elf_hash_number = _dl_elf_hash((const unsigned char *)name);
+ /* Calculate the old sysv hash number only once */
+ if (elf_hash_number == 0xffffffff)
+ elf_hash_number = _dl_elf_hash((const unsigned char *)name);
- sym = _dl_lookup_sysv_hash(tpnt, symtab, elf_hash_number, name, type_class);
- if (sym != NULL)
- break;
+ sym = _dl_lookup_sysv_hash(tpnt, symtab, elf_hash_number, name, type_class);
+ if (sym != NULL)
+ /* If sym has been found, do not search further */
+ break;
#ifdef __LDSO_GNU_HASH_SUPPORT__
- }
+ }
#endif
- } /* end of for (; rpnt; rpnt = rpnt->next) { */
+ } /* End of inner for */
+ }
if (sym) {
+ if (sym_ref) {
+ sym_ref->sym = sym;
+ sym_ref->tpnt = tpnt;
+ }
/* At this point we have found the requested symbol, do binding */
+#if defined(USE_TLS) && USE_TLS
+ if (ELF_ST_TYPE(sym->st_info) == STT_TLS) {
+ _dl_assert(sym_ref != NULL);
+ return (char *)sym->st_value;
+ }
+#endif
+
switch (ELF_ST_BIND(sym->st_info)) {
case STB_WEAK:
#if 0
-/* Perhaps we should support old style weak symbol handling
- * per what glibc does when you export LD_DYNAMIC_WEAK */
- if (!weak_sym) {
- weak_tpnt = tpnt;
- weak_sym = sym;
- }
+ /* Perhaps we should support old style weak symbol handling
+ * per what glibc does when you export LD_DYNAMIC_WEAK */
+ if (!weak_result)
+ weak_result = (char *)DL_FIND_HASH_VALUE(tpnt, type_class, sym);
break;
#endif
case STB_GLOBAL:
#ifdef __FDPIC__
- if (tpntp)
- *tpntp = tpnt;
+ if (sym_ref)
+ sym_ref->tpnt = tpnt;
#endif
- return (char *) DL_FIND_HASH_VALUE (tpnt, type_class, sym);
+ return (char *)DL_FIND_HASH_VALUE(tpnt, type_class, sym);
default: /* Local symbols not handled here */
break;
}
}
- if (weak_sym) {
#ifdef __FDPIC__
- if (tpntp)
- *tpntp = weak_tpnt;
+ if (sym_ref)
+ sym_ref->tpnt = tpnt;
#endif
- return (char *) DL_FIND_HASH_VALUE (weak_tpnt, type_class, weak_sym);
- }
-#ifdef __FDPIC__
- if (tpntp)
- *tpntp = NULL;
-#endif
- return NULL;
+ return weak_result;
}
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