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-rw-r--r--sysdeps/arm/bits/atomic.h159
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diff --git a/sysdeps/arm/bits/atomic.h b/sysdeps/arm/bits/atomic.h
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+/* Atomic operations.  Pure ARM version.
+   Copyright (C) 2002-2014 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/>.  */
+
+#include <stdint.h>
+
+typedef int8_t atomic8_t;
+typedef uint8_t uatomic8_t;
+typedef int_fast8_t atomic_fast8_t;
+typedef uint_fast8_t uatomic_fast8_t;
+
+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 intptr_t atomicptr_t;
+typedef uintptr_t uatomicptr_t;
+typedef intmax_t atomic_max_t;
+typedef uintmax_t uatomic_max_t;
+
+void __arm_link_error (void);
+
+#ifdef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
+# define atomic_full_barrier() __sync_synchronize ()
+#else
+# define atomic_full_barrier() __arm_assisted_full_barrier ()
+#endif
+
+/* An OS-specific bits/atomic.h file will define this macro if
+   the OS can provide something.  If not, we'll fail to build
+   with a compiler that doesn't supply the operation.  */
+#ifndef __arm_assisted_full_barrier
+# define __arm_assisted_full_barrier()  __arm_link_error()
+#endif
+
+/* Use the atomic builtins provided by GCC in case the backend provides
+   a pattern to do this efficiently.  */
+#if __GNUC_PREREQ (4, 7) && defined __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
+
+# define atomic_exchange_acq(mem, value)                                \
+  __atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_ACQUIRE)
+
+# define atomic_exchange_rel(mem, value)                                \
+  __atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_RELEASE)
+
+/* Atomic exchange (without compare).  */
+
+# define __arch_exchange_8_int(mem, newval, model)      \
+  (__arm_link_error (), (typeof (*mem)) 0)
+
+# define __arch_exchange_16_int(mem, newval, model)     \
+  (__arm_link_error (), (typeof (*mem)) 0)
+
+# define __arch_exchange_32_int(mem, newval, model)     \
+  __atomic_exchange_n (mem, newval, model)
+
+# define __arch_exchange_64_int(mem, newval, model)     \
+  (__arm_link_error (), (typeof (*mem)) 0)
+
+/* Compare and exchange with "acquire" semantics, ie barrier after.  */
+
+# define atomic_compare_and_exchange_bool_acq(mem, new, old)    \
+  __atomic_bool_bysize (__arch_compare_and_exchange_bool, int,  \
+                        mem, new, old, __ATOMIC_ACQUIRE)
+
+# define atomic_compare_and_exchange_val_acq(mem, new, old)     \
+  __atomic_val_bysize (__arch_compare_and_exchange_val, int,    \
+                       mem, new, old, __ATOMIC_ACQUIRE)
+
+/* Compare and exchange with "release" semantics, ie barrier before.  */
+
+# define atomic_compare_and_exchange_bool_rel(mem, new, old)    \
+  __atomic_bool_bysize (__arch_compare_and_exchange_bool, int,  \
+                        mem, new, old, __ATOMIC_RELEASE)
+
+# define atomic_compare_and_exchange_val_rel(mem, new, old)      \
+  __atomic_val_bysize (__arch_compare_and_exchange_val, int,    \
+                       mem, new, old, __ATOMIC_RELEASE)
+
+/* Compare and exchange.
+   For all "bool" routines, we return FALSE if exchange succesful.  */
+
+# define __arch_compare_and_exchange_bool_8_int(mem, newval, oldval, model) \
+  ({__arm_link_error (); oldval; })
+
+# define __arch_compare_and_exchange_bool_16_int(mem, newval, oldval, model) \
+  ({__arm_link_error (); oldval; })
+
+# define __arch_compare_and_exchange_bool_32_int(mem, newval, oldval, model) \
+  ({                                                                    \
+    typeof (*mem) __oldval = (oldval);                                  \
+    !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,   \
+                                  model, __ATOMIC_RELAXED);             \
+  })
+
+# define __arch_compare_and_exchange_bool_64_int(mem, newval, oldval, model) \
+  ({__arm_link_error (); oldval; })
+
+# define __arch_compare_and_exchange_val_8_int(mem, newval, oldval, model) \
+  ({__arm_link_error (); oldval; })
+
+# define __arch_compare_and_exchange_val_16_int(mem, newval, oldval, model) \
+  ({__arm_link_error (); oldval; })
+
+# define __arch_compare_and_exchange_val_32_int(mem, newval, oldval, model) \
+  ({                                                                    \
+    typeof (*mem) __oldval = (oldval);                                  \
+    __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,    \
+                                 model, __ATOMIC_RELAXED);              \
+    __oldval;                                                           \
+  })
+
+# define __arch_compare_and_exchange_val_64_int(mem, newval, oldval, model) \
+  ({__arm_link_error (); oldval; })
+
+#elif defined __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
+/* Atomic compare and exchange.  */
+# define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
+  __sync_val_compare_and_swap ((mem), (oldval), (newval))
+#else
+# define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
+  __arm_assisted_compare_and_exchange_val_32_acq ((mem), (newval), (oldval))
+#endif
+
+#if !__GNUC_PREREQ (4, 7) || !defined (__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4)
+/* We don't support atomic operations on any non-word types.
+   So make them link errors.  */
+# define __arch_compare_and_exchange_val_8_acq(mem, newval, oldval) \
+  ({ __arm_link_error (); oldval; })
+
+# define __arch_compare_and_exchange_val_16_acq(mem, newval, oldval) \
+  ({ __arm_link_error (); oldval; })
+
+# define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \
+  ({ __arm_link_error (); oldval; })
+#endif
+
+/* An OS-specific bits/atomic.h file will define this macro if
+   the OS can provide something.  If not, we'll fail to build
+   with a compiler that doesn't supply the operation.  */
+#ifndef __arm_assisted_compare_and_exchange_val_32_acq
+# define __arm_assisted_compare_and_exchange_val_32_acq(mem, newval, oldval) \
+  ({ __arm_link_error (); oldval; })
+#endif