Resize DTV if the current DTV isn't big enough

This patch changes _dl_allocate_tls_init to resize DTV if the current DTV
isn't big enough.  Tested on X86-64, x32 and ia32.

	[BZ #13862]
	* elf/dl-tls.c: Include <atomic.h>.
	(oom): Remove #ifdef SHARED/#endif.
	(_dl_static_dtv, _dl_initial_dtv): Moved before ...
	(_dl_resize_dtv): This.  Extracted from _dl_update_slotinfo.
	(_dl_allocate_tls_init): Resize DTV if the current DTV isn't
	big enough.
	(_dl_update_slotinfo): Call _dl_resize_dtv to resize DTV.
	* nptl/Makefile (tests): Add tst-stack4.
	(modules-names): Add tst-stack4mod.
	($(objpfx)tst-stack4): New.
	(tst-stack4mod.sos): Likewise.
	($(objpfx)tst-stack4.out): Likewise.
	($(tst-stack4mod.sos)): Likewise.
	(clean): Likewise.
	* nptl/tst-stack4.c: New file.
	* nptl/tst-stack4mod.c: Likewise.

1 files changed, 28 insertions, 0 deletions

diff --git a/nptl/tst-stack4mod.c b/nptl/tst-stack4mod.c
new file mode 100644
index 0000000000..a75aa09fc5
--- /dev/null
+++ b/nptl/tst-stack4mod.c
@@ -0,0 +1,28 @@
+/* This tests DTV usage with TLS in dlopened shared object.
+   Copyright (C) 2014 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 Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* 256 is arbitrary here and is known to trigger PR 13862.  */
+__thread int var[256] attribute_hidden = {0};
+
+void
+function (void)
+{
+  int i;
+  for (i = 0; i < sizeof (var) / sizeof (int); i++)
+    var[i] = i;
+}