libc part of prelink IFUNC support.

The dl-lookup.c changes are needed for prelink (support in prelink
checked into SVN, tested for both i?86 and x86-64), dl-irel.h just
something I discovered by code inspection.

ChangeLog

@@ -1,3 +1,11 @@
+2009-06-15  Jakub Jelinek  <jakub@redhat.com>
+
+	* elf/dl-lookup.c (_dl_debug_bindings): When resolving to
+	STT_GNU_IFUNC symbol or in 8 into type_class.
+
+	* sysdeps/i386/dl-irel.h (elf_irel): Use Elf32_Addr type
+	instead of Elf64_Addr.
+
 2009-06-14  Ulrich Drepper  <drepper@redhat.com>
 
 	* po/sv.po: Update from translation team.

elf/dl-lookup.c

@@ -1,5 +1,5 @@
 /* Look up a symbol in the loaded objects.
-   Copyright (C) 1995-2005, 2006, 2007 Free Software Foundation, Inc.
+   Copyright (C) 1995-2005, 2006, 2007, 2009 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
@@ -542,15 +542,20 @@ _dl_debug_bindings (const char *undef_name, struct link_map *undef_map,
 	    conflict = 1;
 	}
 
-      if (value->s
-	  && (__builtin_expect (ELFW(ST_TYPE) (value->s->st_info)
-				== STT_TLS, 0)))
-	type_class = 4;
+      if (value->s)
+	{
+	  if (__builtin_expect (ELFW(ST_TYPE) (value->s->st_info)
+				== STT_TLS, 0))
+	    type_class = 4;
+	  else if (__builtin_expect (ELFW(ST_TYPE) (value->s->st_info)
+				     == STT_GNU_IFUNC, 0))
+	    type_class |= 8;
+	}
 
       if (conflict
 	  || GLRO(dl_trace_prelink_map) == undef_map
 	  || GLRO(dl_trace_prelink_map) == NULL
-	  || type_class == 4)
+	  || type_class >= 4)
 	{
 	  _dl_printf ("%s 0x%0*Zx 0x%0*Zx -> 0x%0*Zx 0x%0*Zx ",
 		      conflict ? "conflict" : "lookup",

sysdeps/i386/dl-irel.h

@@ -35,7 +35,7 @@ elf_irel (const Elf32_Rel *reloc)
 
   if (__builtin_expect (r_type == R_386_IRELATIVE, 1))
     {
-      Elf64_Addr value = ((Elf32_Addr (*) (void)) (*reloc_addr)) ();
+      Elf32_Addr value = ((Elf32_Addr (*) (void)) (*reloc_addr)) ();
       *reloc_addr = value;
     }
   else