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+++ b/ipc/chromium/src/base/atomicops_internals_arm64_gcc.h
@@ -0,0 +1,360 @@
+// Copyright 2014 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.
+
+// TODO(rmcilroy): Investigate whether we can use __sync__ intrinsics instead of
+// the hand coded assembly without introducing perf regressions.
+// TODO(rmcilroy): Investigate whether we can use acquire / release versions of
+// exclusive load / store assembly instructions and do away with
+// the barriers.
+
+#ifndef BASE_ATOMICOPS_INTERNALS_ARM64_GCC_H_
+#define BASE_ATOMICOPS_INTERNALS_ARM64_GCC_H_
+
+#if defined(OS_QNX)
+#include <sys/cpuinline.h>
+#endif
+
+namespace base {
+namespace subtle {
+
+inline void MemoryBarrier() {
+ __asm__ __volatile__ ( // NOLINT
+ "dmb ish \n\t" // Data memory barrier.
+ ::: "memory"
+ ); // NOLINT
+}
+
+
+inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr,
+ Atomic32 old_value,
+ Atomic32 new_value) {
+ Atomic32 prev;
+ int32_t temp;
+
+ __asm__ __volatile__ ( // NOLINT
+ "0: \n\t"
+ "ldxr %w[prev], %[ptr] \n\t" // Load the previous value.
+ "cmp %w[prev], %w[old_value] \n\t"
+ "bne 1f \n\t"
+ "stxr %w[temp], %w[new_value], %[ptr] \n\t" // Try to store the new value.
+ "cbnz %w[temp], 0b \n\t" // Retry if it did not work.
+ "1: \n\t"
+ "clrex \n\t" // In case we didn't swap.
+ : [prev]"=&r" (prev),
+ [temp]"=&r" (temp),
+ [ptr]"+Q" (*ptr)
+ : [old_value]"r" (old_value),
+ [new_value]"r" (new_value)
+ : "memory", "cc"
+ ); // NOLINT
+
+ return prev;
+}
+
+inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr,
+ Atomic32 new_value) {
+ Atomic32 result;
+ int32_t temp;
+
+ __asm__ __volatile__ ( // NOLINT
+ "0: \n\t"
+ "ldxr %w[result], %[ptr] \n\t" // Load the previous value.
+ "stxr %w[temp], %w[new_value], %[ptr] \n\t" // Try to store the new value.
+ "cbnz %w[temp], 0b \n\t" // Retry if it did not work.
+ : [result]"=&r" (result),
+ [temp]"=&r" (temp),
+ [ptr]"+Q" (*ptr)
+ : [new_value]"r" (new_value)
+ : "memory"
+ ); // NOLINT
+
+ return result;
+}
+
+inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr,
+ Atomic32 increment) {
+ Atomic32 result;
+ int32_t temp;
+
+ __asm__ __volatile__ ( // NOLINT
+ "0: \n\t"
+ "ldxr %w[result], %[ptr] \n\t" // Load the previous value.
+ "add %w[result], %w[result], %w[increment]\n\t"
+ "stxr %w[temp], %w[result], %[ptr] \n\t" // Try to store the result.
+ "cbnz %w[temp], 0b \n\t" // Retry on failure.
+ : [result]"=&r" (result),
+ [temp]"=&r" (temp),
+ [ptr]"+Q" (*ptr)
+ : [increment]"r" (increment)
+ : "memory"
+ ); // NOLINT
+
+ return result;
+}
+
+inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr,
+ Atomic32 increment) {
+ MemoryBarrier();
+ Atomic32 result = NoBarrier_AtomicIncrement(ptr, increment);
+ MemoryBarrier();
+
+ return result;
+}
+
+inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr,
+ Atomic32 old_value,
+ Atomic32 new_value) {
+ Atomic32 prev;
+ int32_t temp;
+
+ __asm__ __volatile__ ( // NOLINT
+ "0: \n\t"
+ "ldxr %w[prev], %[ptr] \n\t" // Load the previous value.
+ "cmp %w[prev], %w[old_value] \n\t"
+ "bne 1f \n\t"
+ "stxr %w[temp], %w[new_value], %[ptr] \n\t" // Try to store the new value.
+ "cbnz %w[temp], 0b \n\t" // Retry if it did not work.
+ "dmb ish \n\t" // Data memory barrier.
+ "1: \n\t"
+ // If the compare failed the 'dmb' is unnecessary, but we still need a
+ // 'clrex'.
+ "clrex \n\t"
+ : [prev]"=&r" (prev),
+ [temp]"=&r" (temp),
+ [ptr]"+Q" (*ptr)
+ : [old_value]"r" (old_value),
+ [new_value]"r" (new_value)
+ : "memory", "cc"
+ ); // NOLINT
+
+ return prev;
+}
+
+inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr,
+ Atomic32 old_value,
+ Atomic32 new_value) {
+ Atomic32 prev;
+ int32_t temp;
+
+ MemoryBarrier();
+
+ __asm__ __volatile__ ( // NOLINT
+ "0: \n\t"
+ "ldxr %w[prev], %[ptr] \n\t" // Load the previous value.
+ "cmp %w[prev], %w[old_value] \n\t"
+ "bne 1f \n\t"
+ "stxr %w[temp], %w[new_value], %[ptr] \n\t" // Try to store the new value.
+ "cbnz %w[temp], 0b \n\t" // Retry if it did not work.
+ "1: \n\t"
+ // If the compare failed the we still need a 'clrex'.
+ "clrex \n\t"
+ : [prev]"=&r" (prev),
+ [temp]"=&r" (temp),
+ [ptr]"+Q" (*ptr)
+ : [old_value]"r" (old_value),
+ [new_value]"r" (new_value)
+ : "memory", "cc"
+ ); // NOLINT
+
+ return prev;
+}
+
+inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) {
+ *ptr = value;
+}
+
+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;
+}
+
+// 64-bit versions of the operations.
+// See the 32-bit versions for comments.
+
+inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64* ptr,
+ Atomic64 old_value,
+ Atomic64 new_value) {
+ Atomic64 prev;
+ int32_t temp;
+
+ __asm__ __volatile__ ( // NOLINT
+ "0: \n\t"
+ "ldxr %[prev], %[ptr] \n\t"
+ "cmp %[prev], %[old_value] \n\t"
+ "bne 1f \n\t"
+ "stxr %w[temp], %[new_value], %[ptr] \n\t"
+ "cbnz %w[temp], 0b \n\t"
+ "1: \n\t"
+ "clrex \n\t"
+ : [prev]"=&r" (prev),
+ [temp]"=&r" (temp),
+ [ptr]"+Q" (*ptr)
+ : [old_value]"r" (old_value),
+ [new_value]"r" (new_value)
+ : "memory", "cc"
+ ); // NOLINT
+
+ return prev;
+}
+
+inline Atomic64 NoBarrier_AtomicExchange(volatile Atomic64* ptr,
+ Atomic64 new_value) {
+ Atomic64 result;
+ int32_t temp;
+
+ __asm__ __volatile__ ( // NOLINT
+ "0: \n\t"
+ "ldxr %[result], %[ptr] \n\t"
+ "stxr %w[temp], %[new_value], %[ptr] \n\t"
+ "cbnz %w[temp], 0b \n\t"
+ : [result]"=&r" (result),
+ [temp]"=&r" (temp),
+ [ptr]"+Q" (*ptr)
+ : [new_value]"r" (new_value)
+ : "memory"
+ ); // NOLINT
+
+ return result;
+}
+
+inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64* ptr,
+ Atomic64 increment) {
+ Atomic64 result;
+ int32_t temp;
+
+ __asm__ __volatile__ ( // NOLINT
+ "0: \n\t"
+ "ldxr %[result], %[ptr] \n\t"
+ "add %[result], %[result], %[increment] \n\t"
+ "stxr %w[temp], %[result], %[ptr] \n\t"
+ "cbnz %w[temp], 0b \n\t"
+ : [result]"=&r" (result),
+ [temp]"=&r" (temp),
+ [ptr]"+Q" (*ptr)
+ : [increment]"r" (increment)
+ : "memory"
+ ); // NOLINT
+
+ return result;
+}
+
+inline Atomic64 Barrier_AtomicIncrement(volatile Atomic64* ptr,
+ Atomic64 increment) {
+ MemoryBarrier();
+ Atomic64 result = NoBarrier_AtomicIncrement(ptr, increment);
+ MemoryBarrier();
+
+ return result;
+}
+
+inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64* ptr,
+ Atomic64 old_value,
+ Atomic64 new_value) {
+ Atomic64 prev;
+ int32_t temp;
+
+ __asm__ __volatile__ ( // NOLINT
+ "0: \n\t"
+ "ldxr %[prev], %[ptr] \n\t"
+ "cmp %[prev], %[old_value] \n\t"
+ "bne 1f \n\t"
+ "stxr %w[temp], %[new_value], %[ptr] \n\t"
+ "cbnz %w[temp], 0b \n\t"
+ "dmb ish \n\t"
+ "1: \n\t"
+ "clrex \n\t"
+ : [prev]"=&r" (prev),
+ [temp]"=&r" (temp),
+ [ptr]"+Q" (*ptr)
+ : [old_value]"r" (old_value),
+ [new_value]"r" (new_value)
+ : "memory", "cc"
+ ); // NOLINT
+
+ return prev;
+}
+
+inline Atomic64 Release_CompareAndSwap(volatile Atomic64* ptr,
+ Atomic64 old_value,
+ Atomic64 new_value) {
+ Atomic64 prev;
+ int32_t temp;
+
+ MemoryBarrier();
+
+ __asm__ __volatile__ ( // NOLINT
+ "0: \n\t"
+ "ldxr %[prev], %[ptr] \n\t"
+ "cmp %[prev], %[old_value] \n\t"
+ "bne 1f \n\t"
+ "stxr %w[temp], %[new_value], %[ptr] \n\t"
+ "cbnz %w[temp], 0b \n\t"
+ "1: \n\t"
+ "clrex \n\t"
+ : [prev]"=&r" (prev),
+ [temp]"=&r" (temp),
+ [ptr]"+Q" (*ptr)
+ : [old_value]"r" (old_value),
+ [new_value]"r" (new_value)
+ : "memory", "cc"
+ ); // NOLINT
+
+ return prev;
+}
+
+inline void NoBarrier_Store(volatile Atomic64* ptr, Atomic64 value) {
+ *ptr = value;
+}
+
+inline void Acquire_Store(volatile Atomic64* ptr, Atomic64 value) {
+ *ptr = value;
+ MemoryBarrier();
+}
+
+inline void Release_Store(volatile Atomic64* ptr, Atomic64 value) {
+ MemoryBarrier();
+ *ptr = value;
+}
+
+inline Atomic64 NoBarrier_Load(volatile const Atomic64* ptr) {
+ return *ptr;
+}
+
+inline Atomic64 Acquire_Load(volatile const Atomic64* ptr) {
+ Atomic64 value = *ptr;
+ MemoryBarrier();
+ return value;
+}
+
+inline Atomic64 Release_Load(volatile const Atomic64* ptr) {
+ MemoryBarrier();
+ return *ptr;
+}
+
+} // namespace base::subtle
+} // namespace base
+
+#endif // BASE_ATOMICOPS_INTERNALS_ARM64_GCC_H_