diff options
Diffstat (limited to 'elf/dl-lookup.c')
| -rw-r--r-- | elf/dl-lookup.c | 149 |
1 files changed, 40 insertions, 109 deletions
diff --git a/elf/dl-lookup.c b/elf/dl-lookup.c index f1ec98e..2b58ff32a 100644 --- a/elf/dl-lookup.c +++ b/elf/dl-lookup.c @@ -190,7 +190,7 @@ lookup_t internal_function _dl_lookup_symbol (const char *undef_name, struct link_map *undef_map, const ElfW(Sym) **ref, struct r_scope_elem *symbol_scope[], - int reloc_type) + int reloc_type, int explicit) { const char *reference_name = undef_map ? undef_map->l_name : NULL; const unsigned long int hash = _dl_elf_hash (undef_name); @@ -204,8 +204,8 @@ _dl_lookup_symbol (const char *undef_name, struct link_map *undef_map, /* Search the relevant loaded objects for a definition. */ for (scope = symbol_scope; *scope; ++scope) - if (do_lookup (undef_name, undef_map, hash, *ref, ¤t_value, - *scope, 0, NULL, noexec, noplt)) + if (do_lookup (undef_name, hash, *ref, ¤t_value, *scope, 0, NULL, + noexec, noplt)) { /* We have to check whether this would bind UNDEF_MAP to an object in the global scope which was dynamically loaded. In this case @@ -215,12 +215,15 @@ _dl_lookup_symbol (const char *undef_name, struct link_map *undef_map, && (__builtin_expect (current_value.m->l_type, lt_library) == lt_loaded) && undef_map != current_value.m + /* Don't do this for explicit lookups as opposed to implicit + runtime lookups. */ + && __builtin_expect (! explicit, 1) /* Add UNDEF_MAP to the dependencies. */ && add_dependency (undef_map, current_value.m) < 0) /* Something went wrong. Perhaps the object we tried to reference was just removed. Try finding another definition. */ return _dl_lookup_symbol (undef_name, undef_map, ref, symbol_scope, - reloc_type); + reloc_type, 0); break; } @@ -262,8 +265,8 @@ _dl_lookup_symbol (const char *undef_name, struct link_map *undef_map, struct sym_val protected_value = { NULL, NULL }; for (scope = symbol_scope; *scope; ++scope) - if (do_lookup (undef_name, undef_map, hash, *ref, - &protected_value, *scope, 0, NULL, 0, 1)) + if (do_lookup (undef_name, hash, *ref, &protected_value, *scope, 0, + NULL, 0, 1)) break; if (protected_value.s == NULL || protected_value.m == undef_map) @@ -303,47 +306,13 @@ _dl_lookup_symbol_skip (const char *undef_name, for (i = 0; (*scope)->r_duplist[i] != skip_map; ++i) assert (i < (*scope)->r_nduplist); - if (i < (*scope)->r_nlist - && do_lookup (undef_name, undef_map, hash, *ref, ¤t_value, - *scope, i, skip_map, 0, 0)) - { - /* We have to check whether this would bind UNDEF_MAP to an object - in the global scope which was dynamically loaded. In this case - we have to prevent the latter from being unloaded unless the - UNDEF_MAP object is also unloaded. */ - if (current_value.m->l_global - && (__builtin_expect (current_value.m->l_type, lt_library) - == lt_loaded) - && undef_map != current_value.m - /* Add UNDEF_MAP to the dependencies. */ - && add_dependency (undef_map, current_value.m) < 0) - /* Something went wrong. Perhaps the object we tried to reference - was just removed. Try finding another definition. */ - return _dl_lookup_symbol_skip (undef_name, undef_map, ref, - symbol_scope, skip_map); - } - else + while (i >= (*scope)->r_nlist + || ! do_lookup (undef_name, hash, *ref, ¤t_value, *scope, i, + skip_map, 0, 0)) while (*++scope) - if (do_lookup (undef_name, undef_map, hash, *ref, ¤t_value, - *scope, 0, skip_map, 0, 0)) - { - /* We have to check whether this would bind UNDEF_MAP to an object - in the global scope which was dynamically loaded. In this case - we have to prevent the latter from being unloaded unless the - UNDEF_MAP object is also unloaded. */ - if (__builtin_expect (current_value.m->l_global, 0) - && (__builtin_expect (current_value.m->l_type, lt_library) - == lt_loaded) - && undef_map != current_value.m - /* Add UNDEF_MAP to the dependencies. */ - && add_dependency (undef_map, current_value.m) < 0) - /* Something went wrong. Perhaps the object we tried to reference - was just removed. Try finding another definition. */ - return _dl_lookup_symbol_skip (undef_name, undef_map, ref, - symbol_scope, skip_map); - - break; - } + if (do_lookup (undef_name, hash, *ref, ¤t_value, *scope, 0, + skip_map, 0, 0)) + break; if (__builtin_expect (current_value.s == NULL, 0)) { @@ -370,16 +339,16 @@ _dl_lookup_symbol_skip (const char *undef_name, } else { - /* It is very tricky. We need to figure out what value to - return for the protected symbol */ + /* It is very tricky. We need to figure out what value to + return for the protected symbol. */ struct sym_val protected_value = { NULL, NULL }; if (i >= (*scope)->r_nlist - || !do_lookup (undef_name, undef_map, hash, *ref, &protected_value, - *scope, i, skip_map, 0, 1)) + || !do_lookup (undef_name, hash, *ref, &protected_value, *scope, i, + skip_map, 0, 1)) while (*++scope) - if (do_lookup (undef_name, undef_map, hash, *ref, &protected_value, - *scope, 0, skip_map, 0, 1)) + if (do_lookup (undef_name, hash, *ref, &protected_value, *scope, 0, + skip_map, 0, 1)) break; if (protected_value.s == NULL || protected_value.m == undef_map) @@ -404,7 +373,7 @@ _dl_lookup_versioned_symbol (const char *undef_name, struct link_map *undef_map, const ElfW(Sym) **ref, struct r_scope_elem *symbol_scope[], const struct r_found_version *version, - int reloc_type) + int reloc_type, int explicit) { const char *reference_name = undef_map ? undef_map->l_name : NULL; const unsigned long int hash = _dl_elf_hash (undef_name); @@ -419,9 +388,8 @@ _dl_lookup_versioned_symbol (const char *undef_name, /* Search the relevant loaded objects for a definition. */ for (scope = symbol_scope; *scope; ++scope) { - int res = do_lookup_versioned (undef_name, undef_map, hash, *ref, - ¤t_value, *scope, 0, version, NULL, - noexec, noplt); + int res = do_lookup_versioned (undef_name, hash, *ref, ¤t_value, + *scope, 0, version, NULL, noexec, noplt); if (res > 0) { /* We have to check whether this would bind UNDEF_MAP to an object @@ -432,13 +400,16 @@ _dl_lookup_versioned_symbol (const char *undef_name, && (__builtin_expect (current_value.m->l_type, lt_library) == lt_loaded) && undef_map != current_value.m + /* Don't do this for explicit lookups as opposed to implicit + runtime lookups. */ + && __builtin_expect (! explicit, 1) /* Add UNDEF_MAP to the dependencies. */ && add_dependency (undef_map, current_value.m) < 0) /* Something went wrong. Perhaps the object we tried to reference was just removed. Try finding another definition. */ return _dl_lookup_versioned_symbol (undef_name, undef_map, ref, symbol_scope, version, - reloc_type); + reloc_type, 0); break; } @@ -502,9 +473,8 @@ _dl_lookup_versioned_symbol (const char *undef_name, struct sym_val protected_value = { NULL, NULL }; for (scope = symbol_scope; *scope; ++scope) - if (do_lookup_versioned (undef_name, undef_map, hash, *ref, - &protected_value, *scope, 0, version, NULL, - 0, 1)) + if (do_lookup_versioned (undef_name, hash, *ref, &protected_value, + *scope, 0, version, NULL, 0, 1)) break; if (protected_value.s == NULL || protected_value.m == undef_map) @@ -543,50 +513,13 @@ _dl_lookup_versioned_symbol_skip (const char *undef_name, for (i = 0; (*scope)->r_duplist[i] != skip_map; ++i) assert (i < (*scope)->r_nduplist); - if (i < (*scope)->r_nlist - && do_lookup_versioned (undef_name, undef_map, hash, *ref, - ¤t_value, *scope, i, version, skip_map, - 0, 0)) - { - /* We have to check whether this would bind UNDEF_MAP to an object - in the global scope which was dynamically loaded. In this case - we have to prevent the latter from being unloaded unless the - UNDEF_MAP object is also unloaded. */ - if (__builtin_expect (current_value.m->l_global, 0) - && (__builtin_expect (current_value.m->l_type, lt_library) - == lt_loaded) - && undef_map != current_value.m - /* Add UNDEF_MAP to the dependencies. */ - && add_dependency (undef_map, current_value.m) < 0) - /* Something went wrong. Perhaps the object we tried to reference - was just removed. Try finding another definition. */ - return _dl_lookup_versioned_symbol_skip (undef_name, undef_map, ref, - symbol_scope, version, - skip_map); - } - else + if (i >= (*scope)->r_nlist + || ! do_lookup_versioned (undef_name, hash, *ref, ¤t_value, + *scope, i, version, skip_map, 0, 0)) while (*++scope) - if (do_lookup_versioned (undef_name, undef_map, hash, *ref, - ¤t_value, *scope, 0, version, skip_map, - 0, 0)) - { - /* We have to check whether this would bind UNDEF_MAP to an object - in the global scope which was dynamically loaded. In this case - we have to prevent the latter from being unloaded unless the - UNDEF_MAP object is also unloaded. */ - if (current_value.m->l_global - && (__builtin_expect (current_value.m->l_type, lt_library) - == lt_loaded) - && undef_map != current_value.m - /* Add UNDEF_MAP to the dependencies. */ - && add_dependency (undef_map, current_value.m) < 0) - /* Something went wrong. Perhaps the object we tried to reference - was just removed. Try finding another definition. */ - return _dl_lookup_versioned_symbol_skip (undef_name, undef_map, - ref, symbol_scope, - version, skip_map); - break; - } + if (do_lookup_versioned (undef_name, hash, *ref, ¤t_value, *scope, + 0, version, skip_map, 0, 0)) + break; if (__builtin_expect (current_value.s == NULL, 0)) { @@ -631,13 +564,11 @@ _dl_lookup_versioned_symbol_skip (const char *undef_name, struct sym_val protected_value = { NULL, NULL }; if (i >= (*scope)->r_nlist - || !do_lookup_versioned (undef_name, undef_map, hash, *ref, - &protected_value, *scope, i, version, - skip_map, 0, 1)) + || !do_lookup_versioned (undef_name, hash, *ref, &protected_value, + *scope, i, version, skip_map, 0, 1)) while (*++scope) - if (do_lookup_versioned (undef_name, undef_map, hash, *ref, - &protected_value, *scope, 0, version, - skip_map, 0, 1)) + if (do_lookup_versioned (undef_name, hash, *ref, &protected_value, + *scope, 0, version, skip_map, 0, 1)) break; if (protected_value.s == NULL || protected_value.m == undef_map) |