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| author | bbudge@chromium.org <bbudge@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98> | 2012-08-22 18:22:03 +0000 |
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| committer | bbudge@chromium.org <bbudge@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98> | 2012-08-22 18:22:03 +0000 |
| commit | b2e7f957f7fed546c540a0ee7123dcb976712022 (patch) | |
| tree | c6f069e7a4fca83281d8b7d96b65e26576f709d5 /base/atomicops_internals_arm_gcc.h | |
| parent | 382255a53861cb2eec39b85bf06aed7a05e22530 (diff) | |
| download | chromium_src-b2e7f957f7fed546c540a0ee7123dcb976712022.zip chromium_src-b2e7f957f7fed546c540a0ee7123dcb976712022.tar.gz chromium_src-b2e7f957f7fed546c540a0ee7123dcb976712022.tar.bz2 | |
Fix atomic ops on ARM to compile in NaCl untrusted targets.
This makes the arm version of atomicops_internals use gcc intrinsics for the NaCl
build. Other linux targets won't change.
BUG=116317
TEST=compiles on arm bots
Review URL: https://chromiumcodereview.appspot.com/10831358
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@152791 0039d316-1c4b-4281-b951-d872f2087c98
Diffstat (limited to 'base/atomicops_internals_arm_gcc.h')
| -rw-r--r-- | base/atomicops_internals_arm_gcc.h | 124 |
1 files changed, 0 insertions, 124 deletions
diff --git a/base/atomicops_internals_arm_gcc.h b/base/atomicops_internals_arm_gcc.h deleted file mode 100644 index e838f1b..0000000 --- a/base/atomicops_internals_arm_gcc.h +++ /dev/null @@ -1,124 +0,0 @@ -// Copyright (c) 2009 The Chromium Authors. All rights reserved. -// Use of this source code is governed by a BSD-style license that can be -// found in the LICENSE file. - -// This file is an internal atomic implementation, use base/atomicops.h instead. -// -// LinuxKernelCmpxchg and Barrier_AtomicIncrement are from Google Gears. - -#ifndef BASE_ATOMICOPS_INTERNALS_ARM_GCC_H_ -#define BASE_ATOMICOPS_INTERNALS_ARM_GCC_H_ - -namespace base { -namespace subtle { - -// 0xffff0fc0 is the hard coded address of a function provided by -// the kernel which implements an atomic compare-exchange. On older -// ARM architecture revisions (pre-v6) this may be implemented using -// a syscall. This address is stable, and in active use (hard coded) -// by at least glibc-2.7 and the Android C library. -typedef Atomic32 (*LinuxKernelCmpxchgFunc)(Atomic32 old_value, - Atomic32 new_value, - volatile Atomic32* ptr); -LinuxKernelCmpxchgFunc pLinuxKernelCmpxchg __attribute__((weak)) = - (LinuxKernelCmpxchgFunc) 0xffff0fc0; - -typedef void (*LinuxKernelMemoryBarrierFunc)(void); -LinuxKernelMemoryBarrierFunc pLinuxKernelMemoryBarrier __attribute__((weak)) = - (LinuxKernelMemoryBarrierFunc) 0xffff0fa0; - - -inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr, - Atomic32 old_value, - Atomic32 new_value) { - Atomic32 prev_value = *ptr; - do { - if (!pLinuxKernelCmpxchg(old_value, new_value, - const_cast<Atomic32*>(ptr))) { - return old_value; - } - prev_value = *ptr; - } while (prev_value == old_value); - return prev_value; -} - -inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr, - Atomic32 new_value) { - Atomic32 old_value; - do { - old_value = *ptr; - } while (pLinuxKernelCmpxchg(old_value, new_value, - const_cast<Atomic32*>(ptr))); - return old_value; -} - -inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr, - Atomic32 increment) { - return Barrier_AtomicIncrement(ptr, increment); -} - -inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr, - Atomic32 increment) { - for (;;) { - // Atomic exchange the old value with an incremented one. - Atomic32 old_value = *ptr; - Atomic32 new_value = old_value + increment; - if (pLinuxKernelCmpxchg(old_value, new_value, - const_cast<Atomic32*>(ptr)) == 0) { - // The exchange took place as expected. - return new_value; - } - // Otherwise, *ptr changed mid-loop and we need to retry. - } - -} - -inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr, - Atomic32 old_value, - Atomic32 new_value) { - return NoBarrier_CompareAndSwap(ptr, old_value, new_value); -} - -inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr, - Atomic32 old_value, - Atomic32 new_value) { - return NoBarrier_CompareAndSwap(ptr, old_value, new_value); -} - -inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) { - *ptr = value; -} - -inline void MemoryBarrier() { - pLinuxKernelMemoryBarrier(); -} - -inline void Acquire_Store(volatile Atomic32* ptr, Atomic32 value) { - *ptr = value; - MemoryBarrier(); -} - -inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) { - MemoryBarrier(); - *ptr = value; -} - -inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) { - return *ptr; -} - -inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) { - Atomic32 value = *ptr; - MemoryBarrier(); - return value; -} - -inline Atomic32 Release_Load(volatile const Atomic32* ptr) { - MemoryBarrier(); - return *ptr; -} - -} // namespace base::subtle -} // namespace base - -#endif // BASE_ATOMICOPS_INTERNALS_ARM_GCC_H_ |