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-rw-r--r--elf/dl-lookup.c105
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)
{