/* Locate the shared object symbol nearest a given address.
- Copyright (C) 1996-2004, 2005, 2006, 2007 Free Software Foundation, Inc.
+ Copyright (C) 1996-2003, 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
#include <ldsodefs.h>
-static void
-__attribute ((always_inline))
-determine_info (const ElfW(Addr) addr, struct link_map *match, Dl_info *info,
- struct link_map **mapp, const ElfW(Sym) **symbolp)
+int
+internal_function
+_dl_addr (const void *address, Dl_info *info,
+ struct link_map **mapp, const ElfW(Sym) **symbolp)
{
- /* Now we know what object the address lies in. */
- info->dli_fname = match->l_name;
- info->dli_fbase = (void *) match->l_map_start;
-
- /* If this is the main program the information is incomplete. */
- if (__builtin_expect (match->l_name[0], 'a') == '\0'
- && match->l_type == lt_executable)
- info->dli_fname = _dl_argv[0];
-
- const ElfW(Sym) *symtab
- = (const ElfW(Sym) *) D_PTR (match, l_info[DT_SYMTAB]);
- const char *strtab = (const char *) D_PTR (match, l_info[DT_STRTAB]);
+ const ElfW(Addr) addr = DL_LOOKUP_ADDRESS (address);
+ struct link_map *match;
+ const ElfW(Sym) *symtab, *matchsym, *symtabend;
+ const char *strtab;
+ ElfW(Word) strtabsize;
- ElfW(Word) strtabsize = match->l_info[DT_STRSZ]->d_un.d_val;
+ /* Protect against concurrent loads and unloads. */
+ __rtld_lock_lock_recursive (GL(dl_load_lock));
- 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)
+ /* Find the highest-addressed object that ADDRESS is not below. */
+ match = NULL;
+ for (Lmid_t ns = 0; ns < DL_NNS; ++ns)
+ for (struct link_map *l = GL(dl_ns)[ns]._ns_loaded; l; l = l->l_next)
+ if (addr >= l->l_map_start && addr < l->l_map_end)
{
- Elf32_Word symndx = match->l_gnu_buckets[bucket];
- if (symndx != 0)
+ /* We know ADDRESS lies within L if in any shared object.
+ Make sure it isn't past the end of L's segments. */
+ size_t n = l->l_phnum;
+ if (n > 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
- || symtab[symndx].st_value != 0)
-#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);
+ --n;
+ while (l->l_phdr[n].p_type != PT_LOAD);
+ if (addr >= (l->l_addr +
+ l->l_phdr[n].p_vaddr + l->l_phdr[n].p_memsz))
+ /* Off the end of the highest-addressed shared object. */
+ continue;
}
+
+ match = l;
+ break;
}
- }
- else
+
+ int result = 0;
+ if (match != NULL)
{
- const ElfW(Sym) *symtabend;
+ /* Now we know what object the address lies in. */
+ info->dli_fname = match->l_name;
+ info->dli_fbase = (void *) match->l_map_start;
+
+ /* If this is the main program the information is incomplete. */
+ if (__builtin_expect (match->l_name[0], 'a') == '\0'
+ && match->l_type == lt_executable)
+ info->dli_fname = _dl_argv[0];
+
+ symtab = (const void *) D_PTR (match, l_info[DT_SYMTAB]);
+ strtab = (const void *) D_PTR (match, l_info[DT_STRTAB]);
+
+ strtabsize = match->l_info[DT_STRSZ]->d_un.d_val;
+
if (match->l_info[DT_HASH] != NULL)
symtabend = (symtab
+ ((Elf_Symndx *) D_PTR (match, l_info[DT_HASH]))[1]);
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
+ /* We assume that the string table follows the symbol table,
+ because there is no way in ELF to know the size of the
+ dynamic symbol table!! */
+ for (matchsym = NULL; (void *) symtab < (void *) symtabend; ++symtab)
+ if (addr >= match->l_addr + symtab->st_value
+#if defined USE_TLS
&& ELFW(ST_TYPE) (symtab->st_info) != STT_TLS
#endif
- && (symtab->st_shndx != SHN_UNDEF
- || symtab->st_value != 0)
- && DL_ADDR_SYM_MATCH (match, symtab, matchsym, addr)
- && symtab->st_name < strtabsize)
+ && ((symtab->st_size == 0
+ && addr == match->l_addr + symtab->st_value)
+ || addr < match->l_addr + symtab->st_value + symtab->st_size)
+ && symtab->st_name < strtabsize
+ && (matchsym == NULL || matchsym->st_value < symtab->st_value)
+ && (ELFW(ST_BIND) (symtab->st_info) == STB_GLOBAL
+ || ELFW(ST_BIND) (symtab->st_info) == STB_WEAK))
matchsym = (ElfW(Sym) *) symtab;
- }
- if (mapp)
- *mapp = match;
- if (symbolp)
- *symbolp = matchsym;
+ if (mapp)
+ *mapp = match;
+ if (symbolp)
+ *symbolp = matchsym;
- if (matchsym)
- {
- /* We found a symbol close by. Fill in its name and exact
- address. */
- lookup_t matchl = LOOKUP_VALUE (match);
-
- info->dli_sname = strtab + matchsym->st_name;
- info->dli_saddr = DL_SYMBOL_ADDRESS (matchl, matchsym);
- }
- else
- {
- /* No symbol matches. We return only the containing object. */
- info->dli_sname = NULL;
- info->dli_saddr = NULL;
- }
-}
-
-
-int
-internal_function
-_dl_addr (const void *address, Dl_info *info,
- struct link_map **mapp, const ElfW(Sym) **symbolp)
-{
- const ElfW(Addr) addr = DL_LOOKUP_ADDRESS (address);
- int result = 0;
-
- /* Protect against concurrent loads and unloads. */
- __rtld_lock_lock_recursive (GL(dl_load_lock));
+ if (matchsym)
+ {
+ /* We found a symbol close by. Fill in its name and exact
+ address. */
+ lookup_t matchl = LOOKUP_VALUE (match);
- /* Find the highest-addressed object that ADDRESS is not below. */
- for (Lmid_t ns = 0; ns < DL_NNS; ++ns)
- for (struct link_map *l = GL(dl_ns)[ns]._ns_loaded; l; l = l->l_next)
- if (addr >= l->l_map_start && addr < l->l_map_end
- && (l->l_contiguous || _dl_addr_inside_object (l, addr)))
+ info->dli_sname = strtab + matchsym->st_name;
+ info->dli_saddr = DL_SYMBOL_ADDRESS (matchl, matchsym);
+ }
+ else
{
- determine_info (addr, l, info, mapp, symbolp);
- result = 1;
- goto out;
+ /* No symbol matches. We return only the containing object. */
+ info->dli_sname = NULL;
+ info->dli_saddr = NULL;
}
- out:
+ result = 1;
+ }
+
__rtld_lock_unlock_recursive (GL(dl_load_lock));
return result;
}
libc_hidden_def (_dl_addr)
-
-/* Return non-zero if ADDR lies within one of L's segments. */
-int
-internal_function
-_dl_addr_inside_object (struct link_map *l, const ElfW(Addr) addr)
-{
- int n = l->l_phnum;
- const ElfW(Addr) reladdr = addr - l->l_addr;
-
- while (--n >= 0)
- if (l->l_phdr[n].p_type == PT_LOAD
- && reladdr - l->l_phdr[n].p_vaddr >= 0
- && reladdr - l->l_phdr[n].p_vaddr < l->l_phdr[n].p_memsz)
- return 1;
- return 0;
-}
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