1 files changed, 129 insertions, 0 deletions
diff --git a/elf/dl-sym.c b/elf/dl-sym.c
new file mode 100644
index 0000000000..441b54fe45
--- /dev/null
+++ b/elf/dl-sym.c
@@ -0,0 +1,129 @@
+/* Look up a symbol in a shared object loaded by `dlopen'.
+   Copyright (C) 1999 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
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <stddef.h>
+#include <setjmp.h>
+#include <libintl.h>
+
+#include <dlfcn.h>
+#include <ldsodefs.h>
+#include <dl-hash.h>
+
+void *
+internal_function
+_dl_sym (void *handle, const char *name, void *who)
+{
+  ElfW(Addr) loadbase;
+  const ElfW(Sym) *ref = NULL;
+
+  if (handle == RTLD_DEFAULT)
+    /* Search the global scope.  */
+    loadbase = _dl_lookup_symbol (name, &ref, _dl_global_scope, NULL, 0);
+  else if (handle == RTLD_NEXT)
+    {
+      struct link_map *l, *match;
+      ElfW(Addr) caller = (ElfW(Addr)) who;
+
+      /* Find the highest-addressed object that CALLER is not below.  */
+      match = NULL;
+      for (l = _dl_loaded; l; l = l->l_next)
+	if (caller >= l->l_addr && (!match || match->l_addr < l->l_addr))
+	  match = l;
+
+      if (! match)
+	_dl_signal_error (0, NULL, _("\
+RTLD_NEXT used in code not dynamically loaded"));
+
+      l = match;
+      while (l->l_loader)
+	l = l->l_loader;
+
+      loadbase = _dl_lookup_symbol_skip (name, &ref, l->l_local_scope,
+					 NULL, match);
+    }
+  else
+    {
+      /* Search the scope of the given object.  */
+      struct link_map *map = handle;
+      loadbase = _dl_lookup_symbol (name, &ref, map->l_local_scope,
+				    map->l_name, 0);
+    }
+
+  if (loadbase)
+    return (void *) (loadbase + ref->st_value);
+
+  return NULL;
+}
+
+void *
+internal_function
+_dl_vsym (void *handle, const char *name, const char *version, void *who)
+{
+  ElfW(Addr) loadbase;
+  const ElfW(Sym) *ref = NULL;
+  struct r_found_version vers;
+
+  /* Compute hash value to the version string.  */
+  vers.name = version;
+  vers.hidden = 1;
+  vers.hash = _dl_elf_hash (version);
+  /* We don't have a specific file where the symbol can be found.  */
+  vers.filename = NULL;
+
+  if (handle == RTLD_DEFAULT)
+    /* Search the global scope.  */
+    loadbase = _dl_lookup_versioned_symbol (name, &ref, _dl_global_scope,
+					    NULL, &vers, 0);
+  else if (handle == RTLD_NEXT)
+    {
+      struct link_map *l, *match;
+      ElfW(Addr) caller = (ElfW(Addr)) who;
+
+      /* Find the highest-addressed object that CALLER is not below.  */
+      match = NULL;
+      for (l = _dl_loaded; l; l = l->l_next)
+	if (caller >= l->l_addr && (!match || match->l_addr < l->l_addr))
+	  match = l;
+
+      if (! match)
+	_dl_signal_error (0, NULL, _("\
+RTLD_NEXT used in code not dynamically loaded"));
+
+      l = match;
+      while (l->l_loader)
+	l = l->l_loader;
+
+      loadbase = _dl_lookup_versioned_symbol_skip (name, &ref,
+						   l->l_local_scope,
+						   NULL, &vers, match);
+    }
+  else
+    {
+      /* Search the scope of the given object.  */
+      struct link_map *map = handle;
+      loadbase = _dl_lookup_versioned_symbol (name, &ref,
+					      map->l_local_scope,
+					      map->l_name, &vers, 0);
+    }
+
+  if (loadbase)
+    return (void *) (loadbase + ref->st_value);
+
+  return NULL;
+}