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diff --git a/libitm/config/generic/tls.h b/libitm/config/generic/tls.h
new file mode 100644
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+++ b/libitm/config/generic/tls.h
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+/* Copyright (C) 2008, 2009, 2011 Free Software Foundation, Inc.
+   Contributed by Richard Henderson <rth@redhat.com>.
+
+   This file is part of the GNU Transactional Memory Library (libitm).
+
+   Libitm is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   Libitm 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 General Public License for
+   more details.
+
+   Under Section 7 of GPL version 3, you are granted additional
+   permissions described in the GCC Runtime Library Exception, version
+   3.1, as published by the Free Software Foundation.
+
+   You should have received a copy of the GNU General Public License and
+   a copy of the GCC Runtime Library Exception along with this program;
+   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef LIBITM_TLS_H
+#define LIBITM_TLS_H 1
+
+namespace GTM HIDDEN {
+
+#if !defined(HAVE_ARCH_GTM_THREAD) || !defined(HAVE_ARCH_GTM_THREAD_DISP)
+// Provides a single place to store all this libraries thread-local data.
+struct gtm_thread_tls
+{
+#ifndef HAVE_ARCH_GTM_THREAD
+  // The currently active transaction.  Elided if the target provides
+  // some efficient mechanism for storing this.
+  gtm_thread *thr;
+#endif
+#ifndef HAVE_ARCH_GTM_THREAD_DISP
+  // The dispatch table for the STM implementation currently in use.  Elided
+  // if the target provides some efficient mechanism for storing this.
+  abi_dispatch *disp;
+#endif
+};
+
+extern __thread gtm_thread_tls _gtm_thr_tls;
+#endif
+
+#ifndef HAVE_ARCH_GTM_THREAD
+// If the target does not provide optimized access to the thread-local
+// data, simply access the TLS variable defined above.
+static inline gtm_thread *gtm_thr() { return &_gtm_thr_tls.thr; }
+static inline void set_gtm_thr(gtm_thread *x) { _gtm_thr_tls.thr = x; }
+#endif
+
+#ifndef HAVE_ARCH_GTM_THREAD_DISP
+// If the target does not provide optimized access to the currently
+// active dispatch table, simply access via GTM_THR.
+static inline abi_dispatch * abi_disp() { return _gtm_thr_tls.disp; }
+static inline void set_abi_disp(abi_dispatch *x) { _gtm_thr_tls.disp = x; }
+#endif
+
+} // namespace GTM
+
+#endif // LIBITM_TLS_H