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diff --git a/ports/sysdeps/tile/bits/atomic.h b/ports/sysdeps/tile/bits/atomic.h
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+/* Copyright (C) 2011 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
+
+   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/>.  */
+
+/* The sub-architecture headers provide definitions for these macros
+   that work for "int" and "long" size values only:
+
+   atomic_compare_and_exchange_val_acq()
+   atomic_exchange_acq()
+   atomic_exchange_and_add()
+   atomic_and_val()
+   atomic_or_val()
+   atomic_decrement_if_positive() [tilegx only]
+
+   Here we provide generic definitions true for all Tilera chips.  */
+
+#include <stdint.h>
+#include <features.h>
+
+typedef int32_t atomic32_t;
+typedef uint32_t uatomic32_t;
+typedef int_fast32_t atomic_fast32_t;
+typedef uint_fast32_t uatomic_fast32_t;
+
+typedef int64_t atomic64_t;
+typedef uint64_t uatomic64_t;
+typedef int_fast64_t atomic_fast64_t;
+typedef uint_fast64_t uatomic_fast64_t;
+
+typedef intptr_t atomicptr_t;
+typedef uintptr_t uatomicptr_t;
+typedef intmax_t atomic_max_t;
+typedef uintmax_t uatomic_max_t;
+
+/* Barrier macro. */
+#define atomic_full_barrier() __sync_synchronize()
+
+/* APIs with "release" semantics. */
+#define atomic_compare_and_exchange_val_rel(mem, n, o)          \
+  ({                                                            \
+    atomic_full_barrier ();                                     \
+    atomic_compare_and_exchange_val_acq ((mem), (n), (o));      \
+  })
+#define atomic_compare_and_exchange_bool_rel(mem, n, o)         \
+  ({                                                            \
+    atomic_full_barrier ();                                     \
+    atomic_compare_and_exchange_bool_acq ((mem), (n), (o));     \
+  })
+#define atomic_exchange_rel(mem, n)                             \
+  ({                                                            \
+    atomic_full_barrier ();                                     \
+    atomic_exchange_acq ((mem), (n));                           \
+  })
+
+/* Various macros that should just be synonyms. */
+#define catomic_exchange_and_add atomic_exchange_and_add
+#define atomic_and(mem, mask) ((void) atomic_and_val ((mem), (mask)))
+#define catomic_and atomic_and
+#define atomic_or(mem, mask) ((void) atomic_or_val ((mem), (mask)))
+#define catomic_or atomic_or
+
+/* atomic_bit_test_set in terms of atomic_or_val. */
+#define atomic_bit_test_set(mem, bit)                                   \
+  ({ __typeof (*(mem)) __att0_mask = ((__typeof (*(mem))) 1 << (bit));  \
+    atomic_or_val ((mem), __att0_mask) & __att0_mask; })
+
+/*
+ * This non-existent symbol is called for unsupporrted sizes,
+ * indicating a bug in the caller.
+ */
+extern int __atomic_error_bad_argument_size(void)
+  __attribute__ ((warning ("bad sizeof atomic argument")));