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authorUlrich Drepper <drepper@redhat.com>2006-08-02 16:45:53 +0000
committerUlrich Drepper <drepper@redhat.com>2006-08-02 16:45:53 +0000
commit82ee37c5104b12116f14fb6b00b1dce06dcd3344 (patch)
tree3a8de9b0cfa290e9d52ca6f825ceddf29cd0853a /elf/dl-addr.c
parent5632cd20609a6d52f108d745b77830eddf7d3af7 (diff)
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2006-06-23 Joseph Myers <joseph@codesourcery.com> [BZ #2980] * posix/Makefile (CFLAGS-waitid.c): Add -fasynchronous-unwind-tables. 2006-08-02 Ulrich Drepper <drepper@redhat.com> * elf/dl-addr.c (_dl_addr): If GNU-style hash tables are present, walk them instead of the symbol table.
Diffstat (limited to 'elf/dl-addr.c')
-rw-r--r--elf/dl-addr.c74
1 files changed, 54 insertions, 20 deletions
diff --git a/elf/dl-addr.c b/elf/dl-addr.c
index ced8978..535977c 100644
--- a/elf/dl-addr.c
+++ b/elf/dl-addr.c
@@ -74,28 +74,62 @@ _dl_addr (const void *address, Dl_info *info,
ElfW(Word) strtabsize = match->l_info[DT_STRSZ]->d_un.d_val;
- const ElfW(Sym) *symtabend;
- if (match->l_info[DT_HASH] != NULL)
- symtabend = (symtab
- + ((Elf_Symndx *) D_PTR (match, l_info[DT_HASH]))[1]);
+ const ElfW(Sym) *matchsym = NULL;
+ if (match->l_info[DT_ADDRTAGIDX (DT_GNU_HASH) + DT_NUM + DT_THISPROCNUM
+ + DT_VERSIONTAGNUM + DT_EXTRANUM + DT_VALNUM] != NULL)
+ {
+ /* We look at all symbol table entries referenced by the
+ hash table. */
+ for (Elf_Symndx bucket = 0; bucket < match->l_nbuckets; ++bucket)
+ {
+ Elf32_Word symndx = match->l_gnu_buckets[bucket];
+ if (bucket != 0)
+ {
+ const Elf32_Word *hasharr = &match->l_gnu_chain_zero[symndx];
+
+ do
+ {
+ /* The hash table never references local symbols
+ so we can omit that test here. */
+ if (symtab[symndx].st_shndx != SHN_UNDEF
+#ifdef USE_TLS
+ && ELFW(ST_TYPE) (symtab[symndx].st_info) != STT_TLS
+#endif
+ && DL_ADDR_SYM_MATCH (match, &symtab[symndx],
+ matchsym, addr)
+ && symtab[symndx].st_name < strtabsize)
+ matchsym = (ElfW(Sym) *) &symtab[symndx];
+
+ ++symndx;
+ }
+ while ((*hasharr++ & 1u) == 0);
+ }
+ }
+ }
else
- /* There is no direct way to determine the number of symbols in the
- dynamic symbol table and no hash table is present. The ELF
- binary is ill-formed but what shall we do? Use the beginning of
- the string table which generally follows the symbol table. */
- symtabend = (const ElfW(Sym) *) strtab;
-
- const ElfW(Sym) *matchsym;
- for (matchsym = NULL; (void *) symtab < (void *) symtabend; ++symtab)
- if ((ELFW(ST_BIND) (symtab->st_info) == STB_GLOBAL
- || ELFW(ST_BIND) (symtab->st_info) == STB_WEAK)
-#if defined USE_TLS
- && ELFW(ST_TYPE) (symtab->st_info) != STT_TLS
+ {
+ const ElfW(Sym) *symtabend;
+ if (match->l_info[DT_HASH] != NULL)
+ symtabend = (symtab
+ + ((Elf_Symndx *) D_PTR (match, l_info[DT_HASH]))[1]);
+ else
+ /* There is no direct way to determine the number of symbols in the
+ dynamic symbol table and no hash table is present. The ELF
+ binary is ill-formed but what shall we do? Use the beginning of
+ the string table which generally follows the symbol table. */
+ symtabend = (const ElfW(Sym) *) strtab;
+
+ for (; (void *) symtab < (void *) symtabend; ++symtab)
+ if ((ELFW(ST_BIND) (symtab->st_info) == STB_GLOBAL
+ || ELFW(ST_BIND) (symtab->st_info) == STB_WEAK)
+#ifdef USE_TLS
+ && ELFW(ST_TYPE) (symtab->st_info) != STT_TLS
#endif
- && symtab->st_shndx != SHN_UNDEF
- && DL_ADDR_SYM_MATCH (match, symtab, matchsym, addr)
- && symtab->st_name < strtabsize)
- matchsym = (ElfW(Sym) *) symtab;
+ && symtab->st_shndx != SHN_UNDEF
+ && DL_ADDR_SYM_MATCH (match, symtab, matchsym, addr)
+ && symtab->st_name < strtabsize)
+ matchsym = (ElfW(Sym) *) symtab;
+ }
if (mapp)
*mapp = match;