Binary compatibility of Symbian ARMv5 and ARMv6 builds

Use ARMv6 atomics where available
Use OS atomics otherwise

Integrate ARMV6 atomics to Symbian builds

Use compiler defined macros to detect if ARMv6 instructions are available
This defines the QT_HAVE_ARMV6 macro, replacing the way it was defined
by the Symbian build system previously in qpainting.pri.
qatomic_symbian now uses qatomic_arm or qatomic_armv6 automatically

Port armv6 atomics to implement generic atomics interface

The inline atomics are not inlined when we build for thumb using RVCT.
So there is no performance improvement of using the "inline" versions vs
a shared version called through a function call.
The generic atomics interface is good for binary compatibility, as the
same symbols are exported in all versions now.
Changed the fallback generic atomics implementation from the unix one
to a symbian specific one using RFastLock (identical code to the windows
generic atomics, except for RFastLock replaces Win32 CRITICAL_SECTION)

Note: GCCE atomics still need porting

Tell git to ignore .lst listing files (produced by sbs/abld listing)

ARMv6 support for GCCE compiler and fallback implementation using OS

When building corelib with GCCE and -march=armv6, QT_HAVE_ARMV6 will be
defined. This patch adds copies of the asm functions in GCC syntax.

When building for the Symbian emulator, or ARMv5, then Symbian OS atomic
functions are used as a fallback - these are more efficient than the unix
atomics, and don't require data import (which the ARMv5 atomics use, but
the OS loader doesn't support fully)

Symbian OS functions are always used for QBasicAtomicInt::ref / deref,
because these are faster than the generic function in all cases.
They are machine coded for ARMv6, and are used internally by RFastLock.

Reviewed-By: axis
Reviewed-By: Brad

6 files changed, 582 insertions, 34 deletions

diff --git a/src/corelib/arch/armv6/qatomic_generic_armv6.cpp b/src/corelib/arch/armv6/qatomic_generic_armv6.cpp
new file mode 100644
index 0000000..3078662
--- /dev/null
+++ b/src/corelib/arch/armv6/qatomic_generic_armv6.cpp
@@ -0,0 +1,260 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+** This file implements the generic atomics interface using ARMv6 assembly
+** instructions. It is more efficent than the inline versions when Qt is
+** built for the THUMB instruction set, as the required instructions are
+** only available in ARM state.
+****************************************************************************/
+
+#include <QtCore/qglobal.h>
+
+#ifdef QT_HAVE_ARMV6
+
+QT_BEGIN_NAMESPACE
+
+QT_USE_NAMESPACE
+
+#ifdef Q_CC_RVCT
+#pragma push
+#pragma arm
+Q_CORE_EXPORT asm
+bool QBasicAtomicInt_testAndSetOrdered(volatile int *_q_value, int expectedValue, int newValue)
+{
+    CODE32
+    //R0 = _q_value
+    //R1 = expectedValue
+    //R2 = newValue
+retry_testAndSetOrdered
+    LDREX    r3,[r0]        //r3 = *_q_value
+    EORS     r3,r3,r1       //if (r3 == expectedValue) {
+    STREXEQ  r3,r2,[r0]     //*_q_value = newvalue, r3 = error
+    TEQEQ    r3,#1          //if error
+    BEQ      retry_testAndSetOrdered          //then goto retry }
+    RSBS     r0,r3,#1       //return (r3 == 0)
+    MOVCC    r0,#0
+    BX       r14
+}
+
+Q_CORE_EXPORT asm
+int QBasicAtomicInt_fetchAndStoreOrdered(volatile int *_q_value, int newValue)
+{
+    CODE32
+//R0 = _q_value
+//R1 = newValue
+retry_fetchAndStoreOrdered
+    LDREX    r3,[r0]        //r3 = *_q_value
+    STREX    r2,r1,[r0]     //*_q_value = newValue, r2 = error
+    TEQ      r2,#0          //if error
+    BNE      retry_fetchAndStoreOrdered          //then goto retry
+    MOV      r0,r3          //return r3
+    BX       r14
+}
+
+Q_CORE_EXPORT asm
+int QBasicAtomicInt_fetchAndAddOrdered(volatile int *_q_value, int valueToAdd)
+{
+    CODE32
+    //R0 = _q_value
+    //R1 = valueToAdd
+    STMDB    sp!,{r12,lr}
+retry_fetchAndAddOrdered
+    LDREX    r2,[r0]        //r2 = *_q_value
+    ADD      r3,r2,r1       //r3 = r2 + r1
+    STREX    r12,r3,[r0]    //*_q_value = r3, r12 = error
+    TEQ      r12,#0         //if error
+    BNE      retry_fetchAndAddOrdered          //then retry
+    MOV      r0,r2          //return r2
+    LDMIA    sp!,{r12,pc}
+}
+
+Q_CORE_EXPORT asm
+bool QBasicAtomicPointer_testAndSetOrdered(void * volatile *_q_value,
+                                           void *expectedValue,
+                                           void *newValue)
+{
+    CODE32
+    //R0 = _q_value
+    //R1 = expectedValue
+    //R2 = newValue
+retryPointer_testAndSetOrdered
+    LDREX    r3,[r0]        //r3 = *_q_value
+    EORS     r3,r3,r1       //if (r3 == expectedValue) {
+    STREXEQ  r3,r2,[r0]     //*_q_value = newvalue, r3 = error
+    TEQEQ    r3,#1          //if error
+    BEQ      retryPointer_testAndSetOrdered          //then goto retry }
+    RSBS     r0,r3,#1       //return (r3 == 0)
+    MOVCC    r0,#0
+    BX       r14
+}
+
+Q_CORE_EXPORT asm
+void *QBasicAtomicPointer_fetchAndStoreOrdered(void * volatile *_q_value, void *newValue)
+{
+    CODE32
+    //R0 = _q_value
+    //R1 = newValue
+retryPointer_fetchAndStoreOrdered
+    LDREX    r3,[r0]        //r3 = *_q_value
+    STREX    r2,r1,[r0]     //*_q_value = newValue, r2 = error
+    TEQ      r2,#0          //if error
+    BNE      retryPointer_fetchAndStoreOrdered          //then goto retry
+    MOV      r0,r3          //return r3
+    BX       r14
+}
+
+Q_CORE_EXPORT asm
+void *QBasicAtomicPointer_fetchAndAddOrdered(void * volatile *_q_value, qptrdiff valueToAdd)
+{
+    CODE32
+    //R0 = _q_value
+    //R1 = valueToAdd
+    STMDB    sp!,{r12,lr}
+retryPointer_fetchAndAddOrdered
+    LDREX    r2,[r0]        //r2 = *_q_value
+    ADD      r3,r2,r1       //r3 = r2 + r1
+    STREX    r12,r3,[r0]    //*_q_value = r3, r12 = error
+    TEQ      r12,#0         //if error
+    BNE      retryPointer_fetchAndAddOrdered          //then retry
+    MOV      r0,r2          //return r2
+    LDMIA    sp!,{r12,pc}
+}
+
+#pragma pop
+#elif defined (Q_CC_GCCE)
+Q_CORE_EXPORT __declspec( naked )
+bool QBasicAtomicInt_testAndSetOrdered(volatile int *_q_value, int expectedValue, int newValue)
+{
+    //R0 = _q_value
+    //R1 = expectedValue
+    //R2 = newValue
+    asm("retry_testAndSetOrdered:");
+    asm("    LDREX    r3,[r0]");        //r3 = *_q_value
+    asm("    EORS     r3,r3,r1");       //if (r3 == expectedValue) {
+    asm("    STREXEQ  r3,r2,[r0]");     //*_q_value = newvalue, r3 = error
+    asm("    TEQEQ    r3,#1");          //if error
+    asm("    BEQ      retry_testAndSetOrdered");          //then goto retry }
+    asm("    RSBS     r0,r3,#1");       //return (r3 == 0)
+    asm("    MOVCC    r0,#0");
+    asm("    BX       r14");
+}
+
+Q_CORE_EXPORT __declspec( naked )
+int QBasicAtomicInt_fetchAndStoreOrdered(volatile int *_q_value, int newValue)
+{
+//R0 = _q_value
+//R1 = newValue
+    asm("retry_fetchAndStoreOrdered:");
+    asm("    LDREX    r3,[r0]");        //r3 = *_q_value
+    asm("    STREX    r2,r1,[r0]");     //*_q_value = newValue, r2 = error
+    asm("    TEQ      r2,#0");          //if error
+    asm("    BNE      retry_fetchAndStoreOrdered");          //then goto retry
+    asm("    MOV      r0,r3");          //return r3
+    asm("    BX       r14");
+}
+
+Q_CORE_EXPORT __declspec( naked )
+int QBasicAtomicInt_fetchAndAddOrdered(volatile int *_q_value, int valueToAdd)
+{
+    //R0 = _q_value
+    //R1 = valueToAdd
+    asm("    STMDB    sp!,{r12,lr}");
+    asm("retry_fetchAndAddOrdered:");
+    asm("    LDREX    r2,[r0]");        //r2 = *_q_value
+    asm("    ADD      r3,r2,r1 ");      //r3 = r2 + r1
+    asm("    STREX    r12,r3,[r0]");    //*_q_value = r3, r12 = error
+    asm("    TEQ      r12,#0");         //if error
+    asm("    BNE      retry_fetchAndAddOrdered");          //then retry
+    asm("    MOV      r0,r2");          //return r2
+    asm("    LDMIA    sp!,{r12,pc}");
+}
+
+Q_CORE_EXPORT __declspec( naked )
+bool QBasicAtomicPointer_testAndSetOrdered(void * volatile *_q_value,
+                                           void *expectedValue,
+                                           void *newValue)
+{
+    //R0 = _q_value
+    //R1 = expectedValue
+    //R2 = newValue
+    asm("retryPointer_testAndSetOrdered:");
+    asm("    LDREX    r3,[r0]");        //r3 = *_q_value
+    asm("    EORS     r3,r3,r1");       //if (r3 == expectedValue) {
+    asm("    STREXEQ  r3,r2,[r0]");     //*_q_value = newvalue, r3 = error
+    asm("    TEQEQ    r3,#1");          //if error
+    asm("    BEQ      retryPointer_testAndSetOrdered");          //then goto retry }
+    asm("    RSBS     r0,r3,#1");       //return (r3 == 0)
+    asm("    MOVCC    r0,#0");
+    asm("    BX       r14");
+}
+
+Q_CORE_EXPORT __declspec( naked )
+void *QBasicAtomicPointer_fetchAndStoreOrdered(void * volatile *_q_value, void *newValue)
+{
+    //R0 = _q_value
+    //R1 = newValue
+    asm("retryPointer_fetchAndStoreOrdered:");
+    asm("    LDREX    r3,[r0]");        //r3 = *_q_value
+    asm("    STREX    r2,r1,[r0]");     //*_q_value = newValue, r2 = error
+    asm("    TEQ      r2,#0");          //if error
+    asm("    BNE      retryPointer_fetchAndStoreOrdered");          //then goto retry
+    asm("    MOV      r0,r3");          //return r3
+    asm("    BX       r14");
+}
+
+Q_CORE_EXPORT __declspec( naked )
+void *QBasicAtomicPointer_fetchAndAddOrdered(void * volatile *_q_value, qptrdiff valueToAdd)
+{
+    //R0 = _q_value
+    //R1 = valueToAdd
+    asm("    STMDB    sp!,{r12,lr}");
+    asm("retryPointer_fetchAndAddOrdered:");
+    asm("    LDREX    r2,[r0]");        //r2 = *_q_value
+    asm("    ADD      r3,r2,r1");       //r3 = r2 + r1
+    asm("    STREX    r12,r3,[r0]");    //*_q_value = r3, r12 = error
+    asm("    TEQ      r12,#0");         //if error
+    asm("    BNE      retryPointer_fetchAndAddOrdered");          //then retry
+    asm("    MOV      r0,r2");          //return r2
+    asm("    LDMIA    sp!,{r12,pc}");
+}
+#else
+#error unknown arm compiler
+#endif
+QT_END_NAMESPACE
+#endif
diff --git a/src/corelib/arch/qatomic_armv6.h b/src/corelib/arch/qatomic_armv6.h
index 28655df..1e9f0c4 100644
--- a/src/corelib/arch/qatomic_armv6.h
+++ b/src/corelib/arch/qatomic_armv6.h
@@ -45,7 +45,6 @@
 QT_BEGIN_HEADER
 
 QT_BEGIN_NAMESPACE
-
 #define Q_ATOMIC_INT_REFERENCE_COUNTING_IS_ALWAYS_NATIVE
 
 inline bool QBasicAtomicInt::isReferenceCountingNative()
@@ -101,7 +100,7 @@ template <typename T>
 Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isFetchAndAddWaitFree()
 { return false; }
 
-#ifdef !Q_CC_RVCT
+#ifndef Q_CC_RVCT
 
 inline bool QBasicAtomicInt::ref()
 {
diff --git a/src/corelib/arch/qatomic_symbian.h b/src/corelib/arch/qatomic_symbian.h
index 3721aca..571f628 100644
--- a/src/corelib/arch/qatomic_symbian.h
+++ b/src/corelib/arch/qatomic_symbian.h
@@ -42,12 +42,8 @@
 #ifndef QATOMIC_SYMBIAN_H
 #define QATOMIC_SYMBIAN_H
 
-#if defined(Q_CC_RVCT)
-#  define QT_NO_ARM_EABI
-#  include <QtCore/qatomic_arm.h>
-#elif defined(Q_CC_NOKIAX86) || defined(Q_CC_GCCE)
-#  include <QtCore/qatomic_generic.h>
-#endif
+#include <qglobal.h>
+#include <e32std.h>
 
 QT_BEGIN_HEADER
 
@@ -55,7 +51,237 @@ QT_BEGIN_NAMESPACE
 
 QT_MODULE(Core)
 
-// Empty, but needed to avoid warnings
+#define Q_ATOMIC_INT_REFERENCE_COUNTING_IS_NOT_NATIVE
+
+inline bool QBasicAtomicInt::isReferenceCountingNative()
+{ return false; }
+inline bool QBasicAtomicInt::isReferenceCountingWaitFree()
+{ return false; }
+
+#define Q_ATOMIC_INT_TEST_AND_SET_IS_NOT_NATIVE
+
+inline bool QBasicAtomicInt::isTestAndSetNative()
+{ return false; }
+inline bool QBasicAtomicInt::isTestAndSetWaitFree()
+{ return false; }
+
+#define Q_ATOMIC_INT_FETCH_AND_STORE_IS_NOT_NATIVE
+
+inline bool QBasicAtomicInt::isFetchAndStoreNative()
+{ return false; }
+inline bool QBasicAtomicInt::isFetchAndStoreWaitFree()
+{ return false; }
+
+#define Q_ATOMIC_INT_FETCH_AND_ADD_IS_NOT_NATIVE
+
+inline bool QBasicAtomicInt::isFetchAndAddNative()
+{ return false; }
+inline bool QBasicAtomicInt::isFetchAndAddWaitFree()
+{ return false; }
+
+#define Q_ATOMIC_POINTER_TEST_AND_SET_IS_NOT_NATIVE
+
+template <typename T>
+Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isTestAndSetNative()
+{ return false; }
+template <typename T>
+Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isTestAndSetWaitFree()
+{ return false; }
+
+#define Q_ATOMIC_POINTER_FETCH_AND_STORE_IS_NOT_NATIVE
+
+template <typename T>
+Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isFetchAndStoreNative()
+{ return false; }
+template <typename T>
+Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isFetchAndStoreWaitFree()
+{ return false; }
+
+#define Q_ATOMIC_POINTER_FETCH_AND_ADD_IS_NOT_NATIVE
+
+template <typename T>
+Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isFetchAndAddNative()
+{ return false; }
+template <typename T>
+Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isFetchAndAddWaitFree()
+{ return false; }
+
+Q_CORE_EXPORT bool QBasicAtomicInt_testAndSetOrdered(volatile int *, int, int);
+Q_CORE_EXPORT int QBasicAtomicInt_fetchAndStoreOrdered(volatile int *, int);
+Q_CORE_EXPORT int QBasicAtomicInt_fetchAndAddOrdered(volatile int *, int);
+
+Q_CORE_EXPORT bool QBasicAtomicPointer_testAndSetOrdered(void * volatile *, void *, void *);
+Q_CORE_EXPORT void *QBasicAtomicPointer_fetchAndStoreOrdered(void * volatile *, void *);
+Q_CORE_EXPORT void *QBasicAtomicPointer_fetchAndAddOrdered(void * volatile *, qptrdiff);
+
+// Reference counting
+
+//LockedInc and LockedDec are machine coded for ARMv6 (and future proof)
+inline bool QBasicAtomicInt::ref()
+{
+    int original = User::LockedInc((TInt&)_q_value);
+    return original != -1;
+}
+
+inline bool QBasicAtomicInt::deref()
+{
+    int original = User::LockedDec((TInt&)_q_value);
+    return original != 1;
+}
+
+// Test and set for integers
+
+inline bool QBasicAtomicInt::testAndSetOrdered(int expectedValue, int newValue)
+{
+    return QBasicAtomicInt_testAndSetOrdered(&_q_value, expectedValue, newValue);
+}
+
+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);
+}
+
+// Fetch and store for integers
+
+inline int QBasicAtomicInt::fetchAndStoreOrdered(int newValue)
+{
+    return QBasicAtomicInt_fetchAndStoreOrdered(&_q_value, 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);
+}
+
+// Fetch and add for integers
+
+inline int QBasicAtomicInt::fetchAndAddOrdered(int valueToAdd)
+{
+    return QBasicAtomicInt_fetchAndAddOrdered(&_q_value, valueToAdd);
+}
+
+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);
+}
+
+// Test and set for pointers
+
+template <typename T>
+Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetOrdered(T *expectedValue, T *newValue)
+{
+    union { T * volatile * typed; void * volatile * voidp; } pointer;
+    pointer.typed = &_q_value;
+    return QBasicAtomicPointer_testAndSetOrdered(pointer.voidp, expectedValue, newValue);
+}
+
+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);
+}
+
+// Fetch and store for pointers
+
+template <typename T>
+Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndStoreOrdered(T *newValue)
+{
+    union { T * volatile * typed; void * volatile * voidp; } pointer;
+    union { T *typed; void *voidp; } returnValue;
+    pointer.typed = &_q_value;
+    returnValue.voidp = QBasicAtomicPointer_fetchAndStoreOrdered(pointer.voidp, newValue);
+    return returnValue.typed;
+}
+
+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);
+}
+
+// Fetch and add for pointers
+
+template <typename T>
+Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndAddOrdered(qptrdiff valueToAdd)
+{
+    union { T * volatile *typed; void * volatile *voidp; } pointer;
+    union { T *typed; void *voidp; } returnValue;
+    pointer.typed = &_q_value;
+    returnValue.voidp = QBasicAtomicPointer_fetchAndAddOrdered(pointer.voidp, valueToAdd * sizeof(T));
+    return returnValue.typed;
+}
+
+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
 
diff --git a/src/corelib/arch/symbian/arch.pri b/src/corelib/arch/symbian/arch.pri
index deb94b1..3ef1c9e 100644
--- a/src/corelib/arch/symbian/arch.pri
+++ b/src/corelib/arch/symbian/arch.pri
@@ -2,4 +2,4 @@
 # Symbian architecture
 #
 SOURCES +=  $$QT_ARCH_CPP/qatomic_symbian.cpp \
-            $$QT_ARCH_CPP/../generic/qatomic_generic_unix.cpp
+            $$QT_ARCH_CPP/../armv6/qatomic_generic_armv6.cpp
diff --git a/src/corelib/arch/symbian/qatomic_symbian.cpp b/src/corelib/arch/symbian/qatomic_symbian.cpp
index 8f02155..2ab5ae9 100644
--- a/src/corelib/arch/symbian/qatomic_symbian.cpp
+++ b/src/corelib/arch/symbian/qatomic_symbian.cpp
@@ -50,7 +50,7 @@ QT_BEGIN_NAMESPACE
 // This way we can report on heap cells and handles that are really not owned by anything which still exists.
 // This information can be used to detect whether memory leaks are happening, particularly if these numbers grow as the app is used more.
 // This code is placed here as it happens to make it the very last static to be destroyed in a Qt app. The
-// reason assumed is that this file appears before any other file declaring static data in the generated 
+// reason assumed is that this file appears before any other file declaring static data in the generated
 // Symbian MMP file. This particular file was chosen as it is the earliest symbian specific file.
 struct QSymbianPrintExitInfo
 {
@@ -77,37 +77,95 @@ struct QSymbianPrintExitInfo
     TInt initThreadHandleCount;
 } symbian_printExitInfo;
 
-QT_END_NAMESPACE
+//For ARMv6, the generic atomics are machine coded
+#ifndef QT_HAVE_ARMV6
 
+class QCriticalSection
+{
+public:
+        QCriticalSection()  { fastlock.CreateLocal(); }
+        ~QCriticalSection() { fastlock.Close(); }
+        void lock()         { fastlock.Wait(); }
+        void unlock()       { fastlock.Signal(); }
 
-#if defined(Q_CC_RVCT)
+private:
+        RFastLock fastlock;
+};
 
-#include "../arm/qatomic_arm.cpp"
+QCriticalSection qAtomicCriticalSection;
 
-QT_BEGIN_NAMESPACE
+Q_CORE_EXPORT
+bool QBasicAtomicInt_testAndSetOrdered(volatile int *_q_value, int expectedValue, int newValue)
+{
+    bool returnValue = false;
+    qAtomicCriticalSection.lock();
+    if (*_q_value == expectedValue) {
+        *_q_value = newValue;
+        returnValue = true;
+    }
+        qAtomicCriticalSection.unlock();
+    return returnValue;
+}
 
-Q_CORE_EXPORT __asm char q_atomic_swp(volatile char *ptr, char newval)
+Q_CORE_EXPORT
+int QBasicAtomicInt_fetchAndStoreOrdered(volatile int *_q_value, int newValue)
 {
-    add r2, pc, #0
-    bx r2
-    arm
-    swpb r2,r1,[r0]
-    mov r0, r2
-    bx lr
-    thumb
+    int returnValue;
+        qAtomicCriticalSection.lock();
+    returnValue = *_q_value;
+    *_q_value = newValue;
+        qAtomicCriticalSection.unlock();
+    return returnValue;
 }
 
-Q_CORE_EXPORT __asm int QBasicAtomicInt::fetchAndStoreOrdered(int newValue)
+Q_CORE_EXPORT
+int QBasicAtomicInt_fetchAndAddOrdered(volatile int *_q_value, int valueToAdd)
 {
-    add r2, pc, #0
-    bx r2
-    arm
-    swp r2,r1,[r0]
-    mov r0, r2
-    bx lr
-    thumb
+    int returnValue;
+        qAtomicCriticalSection.lock();
+    returnValue = *_q_value;
+    *_q_value += valueToAdd;
+        qAtomicCriticalSection.unlock();
+    return returnValue;
 }
 
-QT_END_NAMESPACE
+Q_CORE_EXPORT
+bool QBasicAtomicPointer_testAndSetOrdered(void * volatile *_q_value,
+                                           void *expectedValue,
+                                           void *newValue)
+{
+    bool returnValue = false;
+        qAtomicCriticalSection.lock();
+    if (*_q_value == expectedValue) {
+        *_q_value = newValue;
+        returnValue = true;
+    }
+        qAtomicCriticalSection.unlock();
+    return returnValue;
+}
 
-#endif // Q_CC_RVCT
+Q_CORE_EXPORT
+void *QBasicAtomicPointer_fetchAndStoreOrdered(void * volatile *_q_value, void *newValue)
+{
+    void *returnValue;
+        qAtomicCriticalSection.lock();
+    returnValue = *_q_value;
+    *_q_value = newValue;
+        qAtomicCriticalSection.unlock();
+    return returnValue;
+}
+
+Q_CORE_EXPORT
+void *QBasicAtomicPointer_fetchAndAddOrdered(void * volatile *_q_value, qptrdiff valueToAdd)
+{
+    void *returnValue;
+        qAtomicCriticalSection.lock();
+    returnValue = *_q_value;
+    *_q_value = reinterpret_cast<char *>(returnValue) + valueToAdd;
+        qAtomicCriticalSection.unlock();
+    return returnValue;
+}
+
+#endif // QT_HAVE_ARMV6
+
+QT_END_NAMESPACE
diff --git a/src/corelib/global/qglobal.h b/src/corelib/global/qglobal.h
index d113e02..9558256 100644
--- a/src/corelib/global/qglobal.h
+++ b/src/corelib/global/qglobal.h
@@ -437,13 +437,18 @@ namespace QT_NAMESPACE {}
 #elif defined(__GCCE__)
 #  define Q_CC_GCCE
 #  define QT_VISIBILITY_AVAILABLE
+#  if defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__)
+#    define QT_HAVE_ARMV6
+#  endif
 
 /* ARM Realview Compiler Suite
    RVCT compiler also defines __EDG__ and __GNUC__ (if --gnu flag is given),
    so check for it before that */
 #elif defined(__ARMCC__) || defined(__CC_ARM)
 #  define Q_CC_RVCT
-
+#  if __TARGET_ARCH_ARM >= 6
+#    define QT_HAVE_ARMV6
+#  endif
 #elif defined(__GNUC__)
 #  define Q_CC_GNU
 #  define Q_C_CALLBACKS