/**************************************************************************** ** ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). ** All rights reserved. ** Contact: Nokia Corporation (qt-info@nokia.com) ** ** This file is part of the QtCore module of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** Commercial Usage ** Licensees holding valid Qt Commercial licenses may use this file in ** accordance with the Qt Commercial License Agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and Nokia. ** ** GNU Lesser General Public License Usage ** Alternatively, this file may be used under the terms of the GNU Lesser ** General Public License version 2.1 as published by the Free Software ** Foundation and appearing in the file LICENSE.LGPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU Lesser General Public License version 2.1 requirements ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. ** ** In addition, as a special exception, Nokia gives you certain additional ** rights. These rights are described in the Nokia Qt LGPL Exception ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. ** ** GNU General Public License Usage ** Alternatively, this file may be used under the terms of the GNU ** General Public License version 3.0 as published by the Free Software ** Foundation and appearing in the file LICENSE.GPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU General Public License version 3.0 requirements will be ** met: http://www.gnu.org/copyleft/gpl.html. ** ** If you have questions regarding the use of this file, please contact ** Nokia at qt-info@nokia.com. ** $QT_END_LICENSE$ ** ****************************************************************************/ #ifndef QATOMIC_ARMV6_H #define QATOMIC_ARMV6_H QT_BEGIN_HEADER QT_BEGIN_NAMESPACE #define Q_ATOMIC_INT_REFERENCE_COUNTING_IS_ALWAYS_NATIVE inline bool QBasicAtomicInt::isReferenceCountingNative() { return true; } inline bool QBasicAtomicInt::isReferenceCountingWaitFree() { return false; } #define Q_ATOMIC_INT_TEST_AND_SET_IS_ALWAYS_NATIVE inline bool QBasicAtomicInt::isTestAndSetNative() { return true; } inline bool QBasicAtomicInt::isTestAndSetWaitFree() { return false; } #define Q_ATOMIC_INT_FETCH_AND_STORE_IS_ALWAYS_NATIVE inline bool QBasicAtomicInt::isFetchAndStoreNative() { return true; } inline bool QBasicAtomicInt::isFetchAndStoreWaitFree() { return false; } #define Q_ATOMIC_INT_FETCH_AND_ADD_IS_ALWAYS_NATIVE inline bool QBasicAtomicInt::isFetchAndAddNative() { return true; } inline bool QBasicAtomicInt::isFetchAndAddWaitFree() { return false; } #define Q_ATOMIC_POINTER_TEST_AND_SET_IS_ALWAYS_NATIVE template <typename T> Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isTestAndSetNative() { return true; } template <typename T> Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isTestAndSetWaitFree() { return false; } #define Q_ATOMIC_POINTER_FETCH_AND_STORE_IS_ALWAYS_NATIVE template <typename T> Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isFetchAndStoreNative() { return true; } template <typename T> Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isFetchAndStoreWaitFree() { return false; } #define Q_ATOMIC_POINTER_FETCH_AND_ADD_IS_ALWAYS_NATIVE template <typename T> Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isFetchAndAddNative() { return true; } template <typename T> Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isFetchAndAddWaitFree() { return false; } #ifndef Q_CC_RVCT inline bool QBasicAtomicInt::ref() { register int newValue; register int result; asm volatile("0:\n" "ldrex %[newValue], [%[_q_value]]\n" "add %[newValue], %[newValue], #1\n" "strex %[result], %[newValue], [%[_q_value]]\n" "teq %[result], #0\n" "bne 0b\n" : [newValue] "=&r" (newValue), [result] "=&r" (result), "+m" (_q_value) : [_q_value] "r" (&_q_value) : "cc", "memory"); return newValue != 0; } inline bool QBasicAtomicInt::deref() { register int newValue; register int result; asm volatile("0:\n" "ldrex %[newValue], [%[_q_value]]\n" "sub %[newValue], %[newValue], #1\n" "strex %[result], %[newValue], [%[_q_value]]\n" "teq %[result], #0\n" "bne 0b\n" : [newValue] "=&r" (newValue), [result] "=&r" (result), "+m" (_q_value) : [_q_value] "r" (&_q_value) : "cc", "memory"); return newValue != 0; } inline bool QBasicAtomicInt::testAndSetOrdered(int expectedValue, int newValue) { register int result; asm volatile("0:\n" "ldrex %[result], [%[_q_value]]\n" "eors %[result], %[result], %[expectedValue]\n" "strexeq %[result], %[newValue], [%[_q_value]]\n" "teqeq %[result], #1\n" "beq 0b\n" : [result] "=&r" (result), "+m" (_q_value) : [expectedValue] "r" (expectedValue), [newValue] "r" (newValue), [_q_value] "r" (&_q_value) : "cc", "memory"); return result == 0; } inline int QBasicAtomicInt::fetchAndStoreOrdered(int newValue) { register int originalValue; register int result; asm volatile("0:\n" "ldrex %[originalValue], [%[_q_value]]\n" "strex %[result], %[newValue], [%[_q_value]]\n" "teq %[result], #0\n" "bne 0b\n" : [originalValue] "=&r" (originalValue), [result] "=&r" (result), "+m" (_q_value) : [newValue] "r" (newValue), [_q_value] "r" (&_q_value) : "cc", "memory"); return originalValue; } inline int QBasicAtomicInt::fetchAndAddOrdered(int valueToAdd) { register int originalValue; register int newValue; register int result; asm volatile("0:\n" "ldrex %[originalValue], [%[_q_value]]\n" "add %[newValue], %[originalValue], %[valueToAdd]\n" "strex %[result], %[newValue], [%[_q_value]]\n" "teq %[result], #0\n" "bne 0b\n" : [originalValue] "=&r" (originalValue), [newValue] "=&r" (newValue), [result] "=&r" (result), "+m" (_q_value) : [valueToAdd] "r" (valueToAdd), [_q_value] "r" (&_q_value) : "cc", "memory"); return originalValue; } template <typename T> Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetOrdered(T *expectedValue, T *newValue) { register T *result; asm volatile("0:\n" "ldrex %[result], [%[_q_value]]\n" "eors %[result], %[result], %[expectedValue]\n" "strexeq %[result], %[newValue], [%[_q_value]]\n" "teqeq %[result], #1\n" "beq 0b\n" : [result] "=&r" (result), "+m" (_q_value) : [expectedValue] "r" (expectedValue), [newValue] "r" (newValue), [_q_value] "r" (&_q_value) : "cc", "memory"); return result == 0; } template <typename T> Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndStoreOrdered(T *newValue) { register T *originalValue; register int result; asm volatile("0:\n" "ldrex %[originalValue], [%[_q_value]]\n" "strex %[result], %[newValue], [%[_q_value]]\n" "teq %[result], #0\n" "bne 0b\n" : [originalValue] "=&r" (originalValue), [result] "=&r" (result), "+m" (_q_value) : [newValue] "r" (newValue), [_q_value] "r" (&_q_value) : "cc", "memory"); return originalValue; } template <typename T> Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndAddOrdered(qptrdiff valueToAdd) { register T *originalValue; register T *newValue; register int result; asm volatile("0:\n" "ldrex %[originalValue], [%[_q_value]]\n" "add %[newValue], %[originalValue], %[valueToAdd]\n" "strex %[result], %[newValue], [%[_q_value]]\n" "teq %[result], #0\n" "bne 0b\n" : [originalValue] "=&r" (originalValue), [newValue] "=&r" (newValue), [result] "=&r" (result), "+m" (_q_value) : [valueToAdd] "r" (valueToAdd * sizeof(T)), [_q_value] "r" (&_q_value) : "cc", "memory"); return originalValue; } #else // This is Q_CC_RVCT // RVCT inline assembly documentation: // http://www.keil.com/support/man/docs/armcc/armcc_chdcffdb.htm // RVCT embedded assembly documentation: // http://www.keil.com/support/man/docs/armcc/armcc_chddbeib.htm // save our pragma state and switch to ARM mode #pragma push #pragma arm inline bool QBasicAtomicInt::ref() { register int newValue; register int result; retry: __asm { ldrex newValue, [&_q_value] add newValue, newValue, #1 strex result, newValue, [&_q_value] teq result, #0 bne retry } return newValue != 0; } inline bool QBasicAtomicInt::deref() { register int newValue; register int result; retry: __asm { ldrex newValue, [&_q_value] sub newValue, newValue, #1 strex result, newValue, [&_q_value] teq result, #0 bne retry } return newValue != 0; } inline bool QBasicAtomicInt::testAndSetOrdered(int expectedValue, int newValue) { register int result; retry: __asm { ldrex result, [&_q_value] eors result, result, expectedValue strexeq result, newValue, [&_q_value] teqeq result, #1 beq retry } return result == 0; } inline int QBasicAtomicInt::fetchAndStoreOrdered(int newValue) { register int originalValue; register int result; retry: __asm { ldrex originalValue, [&_q_value] strex result, newValue, [&_q_value] teq result, #0 bne retry } return originalValue; } inline int QBasicAtomicInt::fetchAndAddOrdered(int valueToAdd) { register int originalValue; register int newValue; register int result; retry: __asm { ldrex originalValue, [&_q_value] add newValue, originalValue, valueToAdd strex result, newValue, [&_q_value] teq result, #0 bne retry } return originalValue; } template <typename T> Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetOrdered(T *expectedValue, T *newValue) { register T *result; retry: __asm { ldrex result, [&_q_value] eors result, result, expectedValue strexeq result, newValue, [&_q_value] teqeq result, #1 beq retry } return result == 0; } template <typename T> Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndStoreOrdered(T *newValue) { register T *originalValue; register int result; retry: __asm { ldrex originalValue, [&_q_value] strex result, newValue, [&_q_value] teq result, #0 bne retry } return originalValue; } template <typename T> Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndAddOrdered(qptrdiff valueToAdd) { register T *originalValue; register T *newValue; register int result; retry: __asm { ldrex originalValue, [&_q_value] add newValue, originalValue, valueToAdd * sizeof(T) strex result, newValue, [&_q_value] teq result, #0 bne retry } return originalValue; } // go back to the previous pragma state (probably Thumb mode) #pragma pop #endif // common code inline bool QBasicAtomicInt::testAndSetRelaxed(int expectedValue, int newValue) { return testAndSetOrdered(expectedValue, newValue); } inline bool QBasicAtomicInt::testAndSetAcquire(int expectedValue, int newValue) { return testAndSetOrdered(expectedValue, newValue); } inline bool QBasicAtomicInt::testAndSetRelease(int expectedValue, int newValue) { return testAndSetOrdered(expectedValue, newValue); } inline int QBasicAtomicInt::fetchAndStoreRelaxed(int newValue) { return fetchAndStoreOrdered(newValue); } inline int QBasicAtomicInt::fetchAndStoreAcquire(int newValue) { return fetchAndStoreOrdered(newValue); } inline int QBasicAtomicInt::fetchAndStoreRelease(int newValue) { return fetchAndStoreOrdered(newValue); } inline int QBasicAtomicInt::fetchAndAddRelaxed(int valueToAdd) { return fetchAndAddOrdered(valueToAdd); } inline int QBasicAtomicInt::fetchAndAddAcquire(int valueToAdd) { return fetchAndAddOrdered(valueToAdd); } inline int QBasicAtomicInt::fetchAndAddRelease(int valueToAdd) { return fetchAndAddOrdered(valueToAdd); } template <typename T> Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetRelaxed(T *expectedValue, T *newValue) { return testAndSetOrdered(expectedValue, newValue); } template <typename T> Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetAcquire(T *expectedValue, T *newValue) { return testAndSetOrdered(expectedValue, newValue); } template <typename T> Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetRelease(T *expectedValue, T *newValue) { return testAndSetOrdered(expectedValue, newValue); } template <typename T> Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndStoreRelaxed(T *newValue) { return fetchAndStoreOrdered(newValue); } template <typename T> Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndStoreAcquire(T *newValue) { return fetchAndStoreOrdered(newValue); } template <typename T> Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndStoreRelease(T *newValue) { return fetchAndStoreOrdered(newValue); } template <typename T> Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndAddRelaxed(qptrdiff valueToAdd) { return fetchAndAddOrdered(valueToAdd); } template <typename T> Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndAddAcquire(qptrdiff valueToAdd) { return fetchAndAddOrdered(valueToAdd); } template <typename T> Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndAddRelease(qptrdiff valueToAdd) { return fetchAndAddOrdered(valueToAdd); } QT_END_NAMESPACE QT_END_HEADER #endif // QATOMIC_ARMV6_H