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Diffstat (limited to 'src/corelib/arch/qatomic_armv6.h')
| -rw-r--r-- | src/corelib/arch/qatomic_armv6.h | 559 |
1 files changed, 559 insertions, 0 deletions
diff --git a/src/corelib/arch/qatomic_armv6.h b/src/corelib/arch/qatomic_armv6.h new file mode 100644 index 0000000000..3bd605853f --- /dev/null +++ b/src/corelib/arch/qatomic_armv6.h @@ -0,0 +1,559 @@ +/**************************************************************************** +** +** Copyright (C) 2011 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. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the Technology Preview License Agreement accompanying +** this package. +** +** 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. +** +** 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 + +#ifndef Q_DATA_MEMORY_BARRIER +# define Q_DATA_MEMORY_BARRIER asm volatile("":::"memory") +#endif +#ifndef Q_COMPILER_MEMORY_BARRIER +# define Q_COMPILER_MEMORY_BARRIER asm volatile("":::"memory") +#endif + +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::testAndSetRelaxed(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"); + return result == 0; +} + +inline int QBasicAtomicInt::fetchAndStoreRelaxed(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"); + return originalValue; +} + +inline int QBasicAtomicInt::fetchAndAddRelaxed(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"); + return originalValue; +} + +template <typename T> +Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetRelaxed(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"); + return result == 0; +} + +template <typename T> +Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndStoreRelaxed(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"); + return originalValue; +} + +template <typename T> +Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndAddRelaxed(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"); + 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 + +#if __TARGET_ARCH_THUMB-0 < 4 +// save our pragma state and switch to ARM mode (unless using Thumb2) +# pragma push +# pragma arm +#endif + +#ifndef Q_DATA_MEMORY_BARRIER +# define Q_DATA_MEMORY_BARRIER __schedule_barrier() +#endif +#ifndef Q_COMPILER_MEMORY_BARRIER +# define Q_COMPILER_MEMORY_BARRIER __schedule_barrier() +#endif + +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::testAndSetRelaxed(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::fetchAndStoreRelaxed(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::fetchAndAddRelaxed(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>::testAndSetRelaxed(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>::fetchAndStoreRelaxed(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>::fetchAndAddRelaxed(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; +} + +#if __TARGET_ARCH_THUMB-0 < 4 +# pragma pop +#endif + +#endif + +// common code + +inline bool QBasicAtomicInt::testAndSetAcquire(int expectedValue, int newValue) +{ + bool returnValue = testAndSetRelaxed(expectedValue, newValue); + Q_DATA_MEMORY_BARRIER; + return returnValue; +} + +inline bool QBasicAtomicInt::testAndSetRelease(int expectedValue, int newValue) +{ + Q_DATA_MEMORY_BARRIER; + return testAndSetRelaxed(expectedValue, newValue); +} + +inline bool QBasicAtomicInt::testAndSetOrdered(int expectedValue, int newValue) +{ + Q_DATA_MEMORY_BARRIER; + bool returnValue = testAndSetRelaxed(expectedValue, newValue); + Q_COMPILER_MEMORY_BARRIER; + return returnValue; +} + +inline int QBasicAtomicInt::fetchAndStoreAcquire(int newValue) +{ + int returnValue = fetchAndStoreRelaxed(newValue); + Q_DATA_MEMORY_BARRIER; + return returnValue; +} + +inline int QBasicAtomicInt::fetchAndStoreRelease(int newValue) +{ + Q_DATA_MEMORY_BARRIER; + return fetchAndStoreRelaxed(newValue); +} + +inline int QBasicAtomicInt::fetchAndStoreOrdered(int newValue) +{ + Q_DATA_MEMORY_BARRIER; + int returnValue = fetchAndStoreRelaxed(newValue); + Q_COMPILER_MEMORY_BARRIER; + return returnValue; +} + + +inline int QBasicAtomicInt::fetchAndAddAcquire(int valueToAdd) +{ + int returnValue = fetchAndAddRelaxed(valueToAdd); + Q_DATA_MEMORY_BARRIER; + return returnValue; +} + +inline int QBasicAtomicInt::fetchAndAddRelease(int valueToAdd) +{ + Q_DATA_MEMORY_BARRIER; + return fetchAndAddRelaxed(valueToAdd); +} + +inline int QBasicAtomicInt::fetchAndAddOrdered(int valueToAdd) +{ + Q_DATA_MEMORY_BARRIER; + int returnValue = fetchAndAddRelaxed(valueToAdd); + Q_COMPILER_MEMORY_BARRIER; + return returnValue; +} + +template <typename T> +Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetAcquire(T *expectedValue, T *newValue) +{ + bool returnValue = testAndSetRelaxed(expectedValue, newValue); + Q_DATA_MEMORY_BARRIER; + return returnValue; +} + +template <typename T> +Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetRelease(T *expectedValue, T *newValue) +{ + Q_DATA_MEMORY_BARRIER; + return testAndSetRelaxed(expectedValue, newValue); +} + +template <typename T> +Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetOrdered(T *expectedValue, T *newValue) +{ + Q_DATA_MEMORY_BARRIER; + bool returnValue = testAndSetAcquire(expectedValue, newValue); + Q_COMPILER_MEMORY_BARRIER; + return returnValue; +} + +template <typename T> +Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndStoreAcquire(T *newValue) +{ + T *returnValue = fetchAndStoreRelaxed(newValue); + Q_DATA_MEMORY_BARRIER; + return returnValue; +} + +template <typename T> +Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndStoreRelease(T *newValue) +{ + Q_DATA_MEMORY_BARRIER; + return fetchAndStoreRelaxed(newValue); +} + +template <typename T> +Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndStoreOrdered(T *newValue) +{ + Q_DATA_MEMORY_BARRIER; + T *returnValue = fetchAndStoreRelaxed(newValue); + Q_COMPILER_MEMORY_BARRIER; + return returnValue; +} + +template <typename T> +Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndAddAcquire(qptrdiff valueToAdd) +{ + T *returnValue = fetchAndAddRelaxed(valueToAdd); + Q_DATA_MEMORY_BARRIER; + return returnValue; +} + +template <typename T> +Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndAddRelease(qptrdiff valueToAdd) +{ + Q_DATA_MEMORY_BARRIER; + return fetchAndAddRelaxed(valueToAdd); +} + +template <typename T> +Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndAddOrdered(qptrdiff valueToAdd) +{ + Q_DATA_MEMORY_BARRIER; + T *returnValue = fetchAndAddRelaxed(valueToAdd); + Q_COMPILER_MEMORY_BARRIER; + return returnValue; +} + +#undef Q_DATA_MEMORY_BARRIER +#undef Q_COMPILER_MEMORY_BARRIER + +QT_END_NAMESPACE + +QT_END_HEADER + +#endif // QATOMIC_ARMV6_H |