* config.h.in (USE_MULTIARCH): Define.

	* configure.in: Handle --enable-multi-arch.
	* elf/dl-runtime.c (_dl_fixup): Handle STT_GNU_IFUNC.
	(_dl_fixup_profile): Likewise.
	* elf/do-lookup.c (dl_lookup_x): Likewise.
	* sysdeps/x86_64/dl-machine.h: Handle STT_GNU_IFUNC.
	* elf/elf.h (STT_GNU_IFUNC): Define.
	* include/libc-symbols.h (libc_ifunc): Define.
	* sysdeps/x86_64/cacheinfo.c: If USE_MULTIARCH is defined, use the
	framework in init-arch.h to get CPUID values.
	* sysdeps/x86_64/multiarch/Makefile: New file.
	* sysdeps/x86_64/multiarch/init-arch.c: New file.
	* sysdeps/x86_64/multiarch/init-arch.h: New file.
	* sysdeps/x86_64/multiarch/sched_cpucount.c: New file.

	* config.make.in (experimental-malloc): Define.
	* configure.in: Handle --enable-experimental-malloc.
	* malloc/Makefile: Handle experimental-malloc flag.
	* malloc/malloc.c: Implement PER_THREAD and ATOMIC_FASTBINS features.
	* malloc/arena.c: Likewise.
	* malloc/hooks.c: Likewise.
	* malloc/malloc.h: Define M_ARENA_TEST and M_ARENA_MAX.

3 files changed, 21 insertions, 6 deletions

diff --git a/elf/dl-runtime.c b/elf/dl-runtime.c
index 968e293409..962f47de64 100644
--- a/elf/dl-runtime.c
+++ b/elf/dl-runtime.c
@@ -1,5 +1,5 @@
 /* On-demand PLT fixup for shared objects.
-   Copyright (C) 1995-2006, 2007 Free Software Foundation, Inc.
+   Copyright (C) 1995-2006, 2007, 2008 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
@@ -130,6 +130,9 @@ _dl_fixup (
   /* And now perhaps the relocation addend.  */
   value = elf_machine_plt_value (l, reloc, value);
 
+  if (__builtin_expect (ELFW(ST_TYPE) (sym->st_info) == STT_GNU_IFUNC, 0))
+    value = ((DL_FIXUP_VALUE_TYPE (*) (void)) value) ();
+
   /* Finally, fix up the plt itself.  */
   if (__builtin_expect (GLRO(dl_bind_not), 0))
     return value;
@@ -215,12 +218,21 @@ _dl_profile_fixup (
 				       defsym != NULL
 				       ? LOOKUP_VALUE_ADDRESS (result)
 					 + defsym->st_value : 0);
+
+	  if (__builtin_expect (ELFW(ST_TYPE) (defsym->st_info)
+				== STT_GNU_IFUNC, 0))
+	    value = ((DL_FIXUP_VALUE_TYPE (*) (void)) value) ();
 	}
       else
 	{
 	  /* We already found the symbol.  The module (and therefore its load
 	     address) is also known.  */
 	  value = DL_FIXUP_MAKE_VALUE (l, l->l_addr + refsym->st_value);
+
+	  if (__builtin_expect (ELFW(ST_TYPE) (refsym->st_info)
+				== STT_GNU_IFUNC, 0))
+	    value = ((DL_FIXUP_VALUE_TYPE (*) (void)) value) ();
+
 	  result = l;
 	}
       /* And now perhaps the relocation addend.  */
diff --git a/elf/do-lookup.h b/elf/do-lookup.h
index ebb9ed5b47..41e5fc137c 100644
--- a/elf/do-lookup.h
+++ b/elf/do-lookup.h
@@ -1,5 +1,5 @@
 /* Look up a symbol in the loaded objects.
-   Copyright (C) 1995-2004, 2005, 2006, 2007 Free Software Foundation, Inc.
+   Copyright (C) 1995-2007, 2008 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
@@ -88,10 +88,12 @@ do_lookup_x (const char *undef_name, uint_fast32_t new_hash,
 
 	if (__builtin_expect (ELFW(ST_TYPE) (sym->st_info) > STT_FUNC
 			      && ELFW(ST_TYPE) (sym->st_info) != STT_COMMON
-			      && ELFW(ST_TYPE) (sym->st_info) != STT_TLS, 0))
-	  /* Ignore all but STT_NOTYPE, STT_OBJECT, STT_FUNC, and STT_COMMON
-	     entries (and STT_TLS if TLS is supported) since these
-	     are no code/data definitions.  */
+			      && ELFW(ST_TYPE) (sym->st_info) != STT_TLS
+			      && ELFW(ST_TYPE) (sym->st_info) != STT_GNU_IFUNC,
+			      0))
+	  /* Ignore all but STT_NOTYPE, STT_OBJECT, STT_FUNC, STT_COMMON,
+	     STT_TLS, and STT_GNU_IFUNC since these are no code/data
+	     definitions.  */
 	  return NULL;
 
 	if (sym != ref && strcmp (strtab + sym->st_name, undef_name))
diff --git a/elf/elf.h b/elf/elf.h
index 2792820c35..cd74d510ee 100644
--- a/elf/elf.h
+++ b/elf/elf.h
@@ -459,6 +459,7 @@ typedef struct
 #define STT_TLS		6		/* Symbol is thread-local data object*/
 #define	STT_NUM		7		/* Number of defined types.  */
 #define STT_LOOS	10		/* Start of OS-specific */
+#define STT_GNU_IFUNC	10		/* Symbol is indirect code object */
 #define STT_HIOS	12		/* End of OS-specific */
 #define STT_LOPROC	13		/* Start of processor-specific */
 #define STT_HIPROC	15		/* End of processor-specific */