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authorUlrich Drepper <drepper@redhat.com>2004-12-22 20:10:10 +0000
committerUlrich Drepper <drepper@redhat.com>2004-12-22 20:10:10 +0000
commita334319f6530564d22e775935d9c91663623a1b4 (patch)
treeb5877475619e4c938e98757d518bb1e9cbead751 /elf/dl-sym.c
parent0ecb606cb6cf65de1d9fc8a919bceb4be476c602 (diff)
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(CFLAGS-tst-align.c): Add -mpreferred-stack-boundary=4.
Diffstat (limited to 'elf/dl-sym.c')
-rw-r--r--elf/dl-sym.c142
1 files changed, 11 insertions, 131 deletions
diff --git a/elf/dl-sym.c b/elf/dl-sym.c
index fa0e3a6..ba00ef5 100644
--- a/elf/dl-sym.c
+++ b/elf/dl-sym.c
@@ -1,5 +1,5 @@
/* Look up a symbol in a shared object loaded by `dlopen'.
- Copyright (C) 1999-2002,2004,2006,2007 Free Software Foundation, Inc.
+ Copyright (C) 1999, 2000, 2001, 2002, 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
@@ -17,7 +17,6 @@
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
-#include <assert.h>
#include <stddef.h>
#include <setjmp.h>
#include <libintl.h>
@@ -25,7 +24,6 @@
#include <dlfcn.h>
#include <ldsodefs.h>
#include <dl-hash.h>
-#include <sysdep-cancel.h>
#ifdef USE_TLS
# include <dl-tls.h>
#endif
@@ -60,29 +58,6 @@ _dl_tls_symaddr (struct link_map *map, const ElfW(Sym) *ref)
#endif
-struct call_dl_lookup_args
-{
- /* Arguments to do_dlsym. */
- struct link_map *map;
- const char *name;
- struct r_found_version *vers;
- int flags;
-
- /* Return values of do_dlsym. */
- lookup_t loadbase;
- const ElfW(Sym) **refp;
-};
-
-static void
-call_dl_lookup (void *ptr)
-{
- struct call_dl_lookup_args *args = (struct call_dl_lookup_args *) ptr;
- args->map = GLRO(dl_lookup_symbol_x) (args->name, args->map, args->refp,
- args->map->l_scope, args->vers, 0,
- args->flags, NULL);
-}
-
-
static void *
internal_function
do_sym (void *handle, const char *name, void *who,
@@ -100,59 +75,19 @@ do_sym (void *handle, const char *name, void *who,
for (Lmid_t ns = 0; ns < 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)))
+ if (caller >= l->l_map_start && caller < l->l_map_end)
{
+ /* There must be exactly one DSO for the range of the virtual
+ memory. Otherwise something is really broken. */
match = l;
break;
}
if (handle == RTLD_DEFAULT)
- {
- /* Search the global scope. We have the simple case where
- we look up in the scope of an object which was part of
- the initial binary. And then the more complex part
- where the object is dynamically loaded and the scope
- array can change. */
- if (RTLD_SINGLE_THREAD_P)
- result = GLRO(dl_lookup_symbol_x) (name, match, &ref,
- match->l_scope, vers, 0,
- flags | DL_LOOKUP_ADD_DEPENDENCY,
- NULL);
- else
- {
- struct call_dl_lookup_args args;
- args.name = name;
- args.map = match;
- args.vers = vers;
- args.flags = flags | DL_LOOKUP_ADD_DEPENDENCY;
- args.refp = &ref;
-
- THREAD_GSCOPE_SET_FLAG ();
-
- const char *objname;
- const char *errstring = NULL;
- bool malloced;
- int err = GLRO(dl_catch_error) (&objname, &errstring, &malloced,
- call_dl_lookup, &args);
-
- THREAD_GSCOPE_RESET_FLAG ();
-
- if (__builtin_expect (errstring != NULL, 0))
- {
- /* The lookup was unsuccessful. Rethrow the error. */
- char *errstring_dup = strdupa (errstring);
- char *objname_dup = strdupa (objname);
- if (malloced)
- free ((char *) errstring);
-
- GLRO(dl_signal_error) (err, objname_dup, NULL, errstring_dup);
- /* NOTREACHED */
- }
-
- result = args.map;
- }
- }
+ /* Search the global scope. */
+ result = GLRO(dl_lookup_symbol_x) (name, match, &ref, match->l_scope,
+ vers, 0, flags|DL_LOOKUP_ADD_DEPENDENCY,
+ NULL);
else if (handle == RTLD_NEXT)
{
if (__builtin_expect (match == GL(dl_ns)[LM_ID_BASE]._ns_loaded, 0))
@@ -168,7 +103,7 @@ RTLD_NEXT used in code not dynamically loaded"));
while (l->l_loader != NULL)
l = l->l_loader;
- result = GLRO(dl_lookup_symbol_x) (name, match, &ref, l->l_local_scope,
+ result = GLRO(dl_lookup_symbol_x) (name, l, &ref, l->l_local_scope,
vers, 0, 0, match);
}
else
@@ -181,69 +116,14 @@ RTLD_NEXT used in code not dynamically loaded"));
if (ref != NULL)
{
- void *value;
-
#if defined USE_TLS && defined SHARED
if (ELFW(ST_TYPE) (ref->st_info) == STT_TLS)
/* The found symbol is a thread-local storage variable.
Return the address for to the current thread. */
- value = _dl_tls_symaddr (result, ref);
- else
-#endif
- value = DL_SYMBOL_ADDRESS (result, ref);
-
-#ifdef SHARED
- /* Auditing checkpoint: we have a new binding. Provide the
- auditing libraries the possibility to change the value and
- tell us whether further auditing is wanted. */
- if (__builtin_expect (GLRO(dl_naudit) > 0, 0))
- {
- const char *strtab = (const char *) D_PTR (result,
- l_info[DT_STRTAB]);
- /* Compute index of the symbol entry in the symbol table of
- the DSO with the definition. */
- unsigned int ndx = (ref - (ElfW(Sym) *) D_PTR (result,
- l_info[DT_SYMTAB]));
-
- if ((match->l_audit_any_plt | result->l_audit_any_plt) != 0)
- {
- unsigned int altvalue = 0;
- struct audit_ifaces *afct = GLRO(dl_audit);
- /* Synthesize a symbol record where the st_value field is
- the result. */
- ElfW(Sym) sym = *ref;
- sym.st_value = (ElfW(Addr)) value;
-
- for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
- {
- if (afct->symbind != NULL
- && ((match->l_audit[cnt].bindflags & LA_FLG_BINDFROM)
- != 0
- || ((result->l_audit[cnt].bindflags & LA_FLG_BINDTO)
- != 0)))
- {
- unsigned int flags = altvalue | LA_SYMB_DLSYM;
- uintptr_t new_value
- = afct->symbind (&sym, ndx,
- &match->l_audit[cnt].cookie,
- &result->l_audit[cnt].cookie,
- &flags, strtab + ref->st_name);
- if (new_value != (uintptr_t) sym.st_value)
- {
- altvalue = LA_SYMB_ALTVALUE;
- sym.st_value = new_value;
- }
- }
-
- afct = afct->next;
- }
-
- value = (void *) sym.st_value;
- }
- }
+ return _dl_tls_symaddr (result, ref);
#endif
- return value;
+ return DL_SYMBOL_ADDRESS (result, ref);
}
return NULL;