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New function _dl_find_dso_for_object

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Consolidate code to search for an address within a DSO.
This commit is contained in:
Siddhesh Poyarekar 2013-02-18 18:00:17 +05:30
parent 8313cb997d
commit be179c8a36
6 changed files with 51 additions and 38 deletions
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9
ChangeLog
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@ -1,3 +1,12 @@
2013-02-18 Siddhesh Poyarekar <siddhesh@redhat.com>
* elf/Versions (ld): Add _dl_find_dso_for_object.
* elf/dl-addr.c (_dl_addr): Use _dl_find_dso_for_object.
* elf/dl-open.c (_dl_find_dso_for_object): New function.
(dl_open_worker): Use _dl_find_dso_for_object.
* elf/dl-sym.c (do_sym): Likewise.
* sysdeps/generic/ldsodefs.h: Declare _dl_find_dso_for_object.
2013-02-18 Andreas Krebbel <Andreas.Krebbel@de.ibm.com>
* sysdeps/s390/s390-64/dl-trampoline.S (_dl_runtime_resolve):

4
elf/Versions
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@ -51,8 +51,8 @@ ld {
# Those are in the dynamic linker, but used by libc.so.
__libc_enable_secure;
_dl_allocate_tls; _dl_allocate_tls_init;
_dl_argv; _dl_get_tls_static_info; _dl_deallocate_tls;
_dl_make_stack_executable; _dl_out_of_memory;
_dl_argv; _dl_find_dso_for_object; _dl_get_tls_static_info;
_dl_deallocate_tls; _dl_make_stack_executable; _dl_out_of_memory;
_dl_rtld_di_serinfo; _dl_starting_up; _dl_tls_setup;
_rtld_global; _rtld_global_ro;

18
elf/dl-addr.c
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@ -130,18 +130,14 @@ _dl_addr (const void *address, Dl_info *info,
/* Protect against concurrent loads and unloads. */
__rtld_lock_lock_recursive (GL(dl_load_lock));
/* Find the highest-addressed object that ADDRESS is not below. */
for (Lmid_t ns = 0; ns < GL(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)))
{
determine_info (addr, l, info, mapp, symbolp);
result = 1;
goto out;
}
struct link_map *l = _dl_find_dso_for_object (addr);
if (l)
{
determine_info (addr, l, info, mapp, symbolp);
result = 1;
}
out:
__rtld_lock_unlock_recursive (GL(dl_load_lock));
return result;

40
elf/dl-open.c
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@ -165,6 +165,29 @@ add_to_global (struct link_map *new)
return 0;
}
/* Search link maps in all namespaces for the DSO that containes the object at
address ADDR. Returns the pointer to the link map of the matching DSO, or
NULL if a match is not found. */
struct link_map *
internal_function
_dl_find_dso_for_object (const ElfW(Addr) addr)
{
struct link_map *l;
/* Find the highest-addressed object that ADDR is not below. */
for (Lmid_t ns = 0; ns < GL(dl_nns); ++ns)
for (l = GL(dl_ns)[ns]._ns_loaded; l != NULL; l = l->l_next)
if (addr >= l->l_map_start && addr < l->l_map_end
&& (l->l_contiguous
|| _dl_addr_inside_object (l, (ElfW(Addr)) addr)))
{
assert (ns == l->l_ns);
return l;
}
return NULL;
}
rtld_hidden_def (_dl_find_dso_for_object);
static void
dl_open_worker (void *a)
{
@ -194,20 +217,11 @@ dl_open_worker (void *a)
call_map = GL(dl_ns)[LM_ID_BASE]._ns_loaded;
#endif
struct link_map *l;
for (Lmid_t ns = 0; ns < GL(dl_nns); ++ns)
for (l = GL(dl_ns)[ns]._ns_loaded; l != NULL; l = l->l_next)
if (caller_dlopen >= (const void *) l->l_map_start
&& caller_dlopen < (const void *) l->l_map_end
&& (l->l_contiguous
|| _dl_addr_inside_object (l, (ElfW(Addr)) caller_dlopen)))
{
assert (ns == l->l_ns);
call_map = l;
goto found_caller;
}
struct link_map *l = _dl_find_dso_for_object ((ElfW(Addr)) caller_dlopen);
if (l)
call_map = l;
found_caller:
if (args->nsid == __LM_ID_CALLER)
{
#ifndef SHARED

14
elf/dl-sym.c
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@ -91,20 +91,10 @@ do_sym (void *handle, const char *name, void *who,
lookup_t result;
ElfW(Addr) caller = (ElfW(Addr)) who;
struct link_map *l = _dl_find_dso_for_object (caller);
/* If the address is not recognized the call comes from the main
program (we hope). */
struct link_map *match = GL(dl_ns)[LM_ID_BASE]._ns_loaded;
/* Find the highest-addressed object that CALLER is not below. */
for (Lmid_t ns = 0; ns < GL(dl_nns); ++ns)
for (struct link_map *l = GL(dl_ns)[ns]._ns_loaded; l != NULL;
l = l->l_next)
if (caller >= l->l_map_start && caller < l->l_map_end
&& (l->l_contiguous || _dl_addr_inside_object (l, caller)))
{
match = l;
break;
}
struct link_map *match = l ? l : GL(dl_ns)[LM_ID_BASE]._ns_loaded;
if (handle == RTLD_DEFAULT)
{

4
sysdeps/generic/ldsodefs.h
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@ -1006,6 +1006,10 @@ extern int _dl_addr_inside_object (struct link_map *l, const ElfW(Addr) addr)
/* Show show of an object. */
extern void _dl_show_scope (struct link_map *new, int from);
extern struct link_map *_dl_find_dso_for_object (const ElfW(Addr) addr)
internal_function;
rtld_hidden_proto (_dl_find_dso_for_object)
__END_DECLS
#endif /* ldsodefs.h */