Switch NaCl code to use GCC intrinsics for atomic ops.

src/include/linux/arm/atomic_ops.h

Index: src/include/linux/arm/atomic_ops.h
diff --git a/src/include/linux/arm/atomic_ops.h b/src/include/linux/arm/atomic_ops.h
deleted file mode 100644
index 0cde4058184ba479fc4c23c996699b20361f850b..0000000000000000000000000000000000000000
--- a/src/include/linux/arm/atomic_ops.h
+++ /dev/null
@@ -1,81 +0,0 @@
-/*
- * Copyright (c) 2011 The Native Client Authors. All rights reserved.
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef NATIVE_CLIENT_SRC_INCLUDE_LINUX_ARM_ATOMIC_OPS_LINUX_ARM_H_
-#define NATIVE_CLIENT_SRC_INCLUDE_LINUX_ARM_ATOMIC_OPS_LINUX_ARM_H_ 1
-
-// Used only by trusted code.  Untrusted code uses gcc intrinsics.
-
-#include "native_client/src/include/portability.h"
-#include <stdint.h>
-
-typedef int32_t Atomic32;
-
-static INLINE Atomic32 CompareAndSwap(volatile Atomic32* ptr,
-                                      Atomic32 old_value,
-                                      Atomic32 new_value) {
-  Atomic32 oldval, res;
-  do {
-    __asm__ __volatile__(
-        "ldrex   %1, [%3]\n"
-        "mov     %0, #0\n"
-        "teq     %1, %4\n"
-        /*
-         * The if-then block affects the following four instructions.
-         * But we only have one we want to predicate.  So we have to
-         * add three nops when compiling for Thumb.
-         */
-        "itt     eq\n"
-        "strexeq %0, %5, [%3]\n"
-#ifdef __thumb__
-        "nop\n"
-        "nop\n"
-        "nop\n"
-#endif
-        : "=&r" (res), "=&r" (oldval), "+Qo" (*ptr)
-        : "r" (ptr), "Ir" (old_value), "r" (new_value)
-        : "cc", "memory");
-  } while (res);
-  return oldval;
-}
-
-static INLINE Atomic32 AtomicExchange(volatile Atomic32* ptr,
-                                      Atomic32 new_value) {
-  Atomic32 tmp, old;
-
-  __asm__ __volatile__(
-      "1:\n"
-      "ldrex %1, [%2]\n"
-      "strex %0, %3, [%2]\n"
-      "teq %0, #0\n"
-      "bne 1b"
-      : "=&r" (tmp), "=&r" (old)
-      : "r" (ptr), "r" (new_value)
-      : "cc", "memory");
-
-  return old;
-}
-
-static INLINE Atomic32 AtomicIncrement(volatile Atomic32* ptr,
-                                       Atomic32 increment) {
-  Atomic32 tmp, res;
-
-  __asm__ __volatile__(
-      "1:\n"
-      "ldrex %1, [%2]\n"
-      "add %1, %1, %3\n"
-      "strex %0, %1, [%2]\n"
-      "cmp %0, #0\n"
-      "bne 1b"
-      : "=&r" (tmp),    // %0
-        "=&r"(res)      // %1
-      : "r" (ptr),      // %2
-        "r"(increment)  // %3
-      : "cc", "memory");
-  return res;
-}
-
-#endif  /* NATIVE_CLIENT_SRC_INCLUDE_LINUX_ARM_ATOMIC_OPS_LINUX_ARM_H_ */