diff options
Diffstat (limited to 'elf/dl-lookup.c')
-rw-r--r-- | elf/dl-lookup.c | 105 |
1 files changed, 56 insertions, 49 deletions
diff --git a/elf/dl-lookup.c b/elf/dl-lookup.c index b72a6a27d5..26357c2484 100644 --- a/elf/dl-lookup.c +++ b/elf/dl-lookup.c @@ -29,77 +29,84 @@ Cambridge, MA 02139, USA. */ Elf32_Addr _dl_lookup_symbol (const char *undef_name, const Elf32_Sym **ref, - struct link_map *symbol_scope, + struct link_map *symbol_scope[2], const char *reference_name, Elf32_Addr reloc_addr, int noplt) { unsigned long int hash = elf_hash (undef_name); - struct link_map *map; struct { Elf32_Addr a; const Elf32_Sym *s; } weak_value = { 0, NULL }; + size_t i; + struct link_map **scope, *map; /* Search the relevant loaded objects for a definition. */ - for (map = symbol_scope; map; map = map->l_next) - { - const Elf32_Sym *symtab; - const char *strtab; - Elf32_Word symidx; - - symtab = ((void *) map->l_addr + map->l_info[DT_SYMTAB]->d_un.d_ptr); - strtab = ((void *) map->l_addr + map->l_info[DT_STRTAB]->d_un.d_ptr); - - /* Search the appropriate hash bucket in this object's symbol table - for a definition for the same symbol name. */ - for (symidx = map->l_buckets[hash % map->l_nbuckets]; - symidx != STN_UNDEF; - symidx = map->l_chain[symidx]) + for (scope = symbol_scope; scope < &symbol_scope[2]; ++scope) + if (*scope) + for (i = 0; i < (*scope)->l_nsearchlist; ++i) { - const Elf32_Sym *sym = &symtab[symidx]; + const Elf32_Sym *symtab; + const char *strtab; + Elf32_Word symidx; + + map = (*scope)->l_searchlist[i]; - if (sym->st_value == 0 || /* No value. */ - reloc_addr == map->l_addr + sym->st_value || /* Self ref. */ - (noplt && sym->st_shndx == SHN_UNDEF)) /* Unwanted PLT entry. */ - continue; + symtab = ((void *) map->l_addr + map->l_info[DT_SYMTAB]->d_un.d_ptr); + strtab = ((void *) map->l_addr + map->l_info[DT_STRTAB]->d_un.d_ptr); - switch (ELF32_ST_TYPE (sym->st_info)) + /* Search the appropriate hash bucket in this object's symbol table + for a definition for the same symbol name. */ + for (symidx = map->l_buckets[hash % map->l_nbuckets]; + symidx != STN_UNDEF; + symidx = map->l_chain[symidx]) { - case STT_NOTYPE: - case STT_FUNC: - case STT_OBJECT: - break; - default: - /* Not a code/data definition. */ - continue; - } + const Elf32_Sym *sym = &symtab[symidx]; - if (sym != *ref && strcmp (strtab + sym->st_name, undef_name)) - /* Not the symbol we are looking for. */ - continue; + if (sym->st_value == 0 || /* No value. */ + /* Cannot resolve to the location being filled in. */ + reloc_addr == map->l_addr + sym->st_value || + (noplt && sym->st_shndx == SHN_UNDEF)) /* Reject PLT. */ + continue; - switch (ELF32_ST_BIND (sym->st_info)) - { - case STB_GLOBAL: - /* Global definition. Just what we need. */ - *ref = sym; - return map->l_addr; - case STB_WEAK: - /* Weak definition. Use this value if we don't find another. */ - if (! weak_value.s) + switch (ELF32_ST_TYPE (sym->st_info)) { - weak_value.s = sym; - weak_value.a = map->l_addr; + case STT_NOTYPE: + case STT_FUNC: + case STT_OBJECT: + break; + default: + /* Not a code/data definition. */ + continue; + } + + if (sym != *ref && strcmp (strtab + sym->st_name, undef_name)) + /* Not the symbol we are looking for. */ + continue; + + switch (ELF32_ST_BIND (sym->st_info)) + { + case STB_GLOBAL: + /* Global definition. Just what we need. */ + *ref = sym; + return map->l_addr; + case STB_WEAK: + /* Weak definition. Use this value if we don't find + another. */ + if (! weak_value.s) + { + weak_value.s = sym; + weak_value.a = map->l_addr; + } + break; + default: + /* Local symbols are ignored. */ + break; } - break; - default: - /* Local symbols are ignored. */ - break; } } - } if (weak_value.s == NULL && ELF32_ST_BIND ((*ref)->st_info) != STB_WEAK) { |