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authorCarmelo Amoroso <carmelo.amoroso@st.com>2008-01-18 13:14:19 +0000
committerCarmelo Amoroso <carmelo.amoroso@st.com>2008-01-18 13:14:19 +0000
commit341b678f45c22cdc60b1312416ad0440aae6685a (patch)
treee1838c397a8b04951b9d00ef5c0a920813f0c830 /ldso/libdl/libdl.c
parent1030faf587a2f4bea255bfd2db28b59e196493aa (diff)
This patch solves a problem in dladdr caused by the wrong value
of elf_resolve's loadaddr field for the main application. Signed-off-by: Filippo Arcidiacono <filippo.arcidiacono@st.com> Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
Diffstat (limited to 'ldso/libdl/libdl.c')
-rw-r--r--ldso/libdl/libdl.c39
1 files changed, 35 insertions, 4 deletions
diff --git a/ldso/libdl/libdl.c b/ldso/libdl/libdl.c
index edf336684..6dc60587b 100644
--- a/ldso/libdl/libdl.c
+++ b/ldso/libdl/libdl.c
@@ -739,13 +739,40 @@ int dladdr(const void *__address, Dl_info * __info)
char *strtab;
ElfW(Sym) *symtab;
unsigned int hn, si, sn, sf;
- ElfW(Addr) sa;
+ ElfW(Addr) sa = 0;
+
+ /* Set the info for the object the address lies in */
+ __info->dli_fname = pelf->libname;
+ __info->dli_fbase = (void *) DL_LOADADDR_BASE(pelf->mapaddr);
- sa = 0;
symtab = (ElfW(Sym) *) (pelf->dynamic_info[DT_SYMTAB]);
strtab = (char *) (pelf->dynamic_info[DT_STRTAB]);
sf = sn = 0;
+
+#ifdef __LDSO_GNU_HASH_SUPPORT__
+ if (pelf->l_gnu_bitmask) {
+ for (hn = 0; hn < pelf->nbucket; hn++) {
+ si = pelf->l_gnu_buckets[hn];
+ if (!si)
+ continue;
+
+ const Elf32_Word *hasharr = &pelf->l_gnu_chain_zero[si];
+ do {
+ ElfW(Addr) symbol_addr;
+
+ symbol_addr = (ElfW(Addr)) pelf->loadaddr + symtab[si].st_value;
+ if (symbol_addr <= (ElfW(Addr))__address && (!sf || sa < symbol_addr)) {
+ sa = symbol_addr;
+ sn = si;
+ sf = 1;
+ }
+ _dl_if_debug_print("Symbol \"%s\" at %p\n", strtab + symtab[si].st_name, symbol_addr);
+ ++si;
+ } while ((*hasharr++ & 1u) == 0);
+ }
+ } else
+#endif
for (hn = 0; hn < pelf->nbucket; hn++) {
for (si = pelf->elf_buckets[hn]; si; si = pelf->chains[si]) {
ElfW(Addr) symbol_addr;
@@ -763,10 +790,14 @@ int dladdr(const void *__address, Dl_info * __info)
}
if (sf) {
- __info->dli_fname = pelf->libname;
- __info->dli_fbase = (void *) DL_LOADADDR_BASE(pelf->loadaddr);
+ /* A nearest symbol has been found; fill the entries */
__info->dli_sname = strtab + symtab[sn].st_name;
__info->dli_saddr = (void *)sa;
+ } else {
+ /* No symbol found, fill entries with NULL value,
+ only the containing object will be returned. */
+ __info->dli_sname = NULL;
+ __info->dli_saddr = NULL;
}
return 1;
}