cef/include/base/internal/cef_atomicops_arm64_gcc.h

336 lines
10 KiB
C++

// Copyright (c) 2012 Google Inc. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the name Chromium Embedded
// Framework nor the names of its contributors may be used to endorse
// or promote products derived from this software without specific prior
// written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Do not include this header file directly. Use base/cef_atomicops.h
// instead.
#ifndef CEF_INCLUDE_BASE_INTERNAL_CEF_ATOMICOPS_ARM64_GCC_H_
#define CEF_INCLUDE_BASE_INTERNAL_CEF_ATOMICOPS_ARM64_GCC_H_
namespace base {
namespace subtle {
inline void MemoryBarrier() {
__asm__ __volatile__ ("dmb ish" ::: "memory"); // NOLINT
}
// NoBarrier versions of the operation include "memory" in the clobber list.
// This is not required for direct usage of the NoBarrier versions of the
// operations. However this is required for correctness when they are used as
// part of the Acquire or Release versions, to ensure that nothing from outside
// the call is reordered between the operation and the memory barrier. This does
// not change the code generated, so has no or minimal impact on the
// NoBarrier operations.
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"
: [prev]"=&r" (prev),
[temp]"=&r" (temp),
[ptr]"+Q" (*ptr)
: [old_value]"IJr" (old_value),
[new_value]"r" (new_value)
: "cc", "memory"
); // 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]"IJr" (increment)
: "memory"
); // NOLINT
return result;
}
inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr,
Atomic32 increment) {
Atomic32 result;
MemoryBarrier();
result = NoBarrier_AtomicIncrement(ptr, increment);
MemoryBarrier();
return result;
}
inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr,
Atomic32 old_value,
Atomic32 new_value) {
Atomic32 prev;
prev = NoBarrier_CompareAndSwap(ptr, old_value, new_value);
MemoryBarrier();
return prev;
}
inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr,
Atomic32 old_value,
Atomic32 new_value) {
Atomic32 prev;
MemoryBarrier();
prev = NoBarrier_CompareAndSwap(ptr, old_value, new_value);
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) {
__asm__ __volatile__ ( // NOLINT
"stlr %w[value], %[ptr] \n\t"
: [ptr]"=Q" (*ptr)
: [value]"r" (value)
: "memory"
); // NOLINT
}
inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) {
return *ptr;
}
inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) {
Atomic32 value;
__asm__ __volatile__ ( // NOLINT
"ldar %w[value], %[ptr] \n\t"
: [value]"=r" (value)
: [ptr]"Q" (*ptr)
: "memory"
); // NOLINT
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"
: [prev]"=&r" (prev),
[temp]"=&r" (temp),
[ptr]"+Q" (*ptr)
: [old_value]"IJr" (old_value),
[new_value]"r" (new_value)
: "cc", "memory"
); // 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]"IJr" (increment)
: "memory"
); // NOLINT
return result;
}
inline Atomic64 Barrier_AtomicIncrement(volatile Atomic64* ptr,
Atomic64 increment) {
Atomic64 result;
MemoryBarrier();
result = NoBarrier_AtomicIncrement(ptr, increment);
MemoryBarrier();
return result;
}
inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64* ptr,
Atomic64 old_value,
Atomic64 new_value) {
Atomic64 prev;
prev = NoBarrier_CompareAndSwap(ptr, old_value, new_value);
MemoryBarrier();
return prev;
}
inline Atomic64 Release_CompareAndSwap(volatile Atomic64* ptr,
Atomic64 old_value,
Atomic64 new_value) {
Atomic64 prev;
MemoryBarrier();
prev = NoBarrier_CompareAndSwap(ptr, old_value, new_value);
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) {
__asm__ __volatile__ ( // NOLINT
"stlr %x[value], %[ptr] \n\t"
: [ptr]"=Q" (*ptr)
: [value]"r" (value)
: "memory"
); // NOLINT
}
inline Atomic64 NoBarrier_Load(volatile const Atomic64* ptr) {
return *ptr;
}
inline Atomic64 Acquire_Load(volatile const Atomic64* ptr) {
Atomic64 value;
__asm__ __volatile__ ( // NOLINT
"ldar %x[value], %[ptr] \n\t"
: [value]"=r" (value)
: [ptr]"Q" (*ptr)
: "memory"
); // NOLINT
return value;
}
inline Atomic64 Release_Load(volatile const Atomic64* ptr) {
MemoryBarrier();
return *ptr;
}
} } // namespace base::subtle
#endif // CEF_INCLUDE_BASE_INTERNAL_CEF_ATOMICOPS_ARM64_GCC_H_