Add support for the Linux/m68k platform

Add necessary support code to recognize m68k as an architecture;
use GCC builtin atomics like avr32 does. Copy avr32 header, since
it was hinted that including it from m68k was not liked.

This is not needed in Qt5 because it’s said to automatically use
the GCC atomic builtins.

Bug-Debian: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=660963

Task-number: QTBUG-28237
Change-Id: I6c51405c47549c904899a6971b6cd34b8239c642
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

3 files changed, 257 insertions, 0 deletions

diff --git a/src/corelib/arch/m68k/arch.pri b/src/corelib/arch/m68k/arch.pri
new file mode 100644
index 0000000..3a50858
--- /dev/null
+++ b/src/corelib/arch/m68k/arch.pri
@@ -0,0 +1,3 @@
+#
+# Motorola 68000 and ColdFire (m68k) architecture
+#
diff --git a/src/corelib/arch/qatomic_arch.h b/src/corelib/arch/qatomic_arch.h
index 2207df9..141726c 100644
--- a/src/corelib/arch/qatomic_arch.h
+++ b/src/corelib/arch/qatomic_arch.h
@@ -66,6 +66,8 @@ QT_BEGIN_HEADER
 #  include "QtCore/qatomic_i386.h"
 #elif defined(QT_ARCH_IA64)
 #  include "QtCore/qatomic_ia64.h"
+#elif defined(QT_ARCH_M68K)
+#  include "QtCore/qatomic_m68k.h"
 #elif defined(QT_ARCH_MACOSX)
 #  include "QtCore/qatomic_macosx.h"
 #elif defined(QT_ARCH_MIPS)
diff --git a/src/corelib/arch/qatomic_m68k.h b/src/corelib/arch/qatomic_m68k.h
new file mode 100644
index 0000000..57e3565
--- /dev/null
+++ b/src/corelib/arch/qatomic_m68k.h
@@ -0,0 +1,252 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** 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, Digia gives you certain additional
+** rights.  These rights are described in the Digia 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.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QATOMIC_M68K_H
+#define QATOMIC_M68K_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
+#define Q_ATOMIC_INT_FETCH_AND_STORE_IS_WAIT_FREE
+
+inline bool QBasicAtomicInt::isFetchAndStoreNative()
+{ return true; }
+inline bool QBasicAtomicInt::isFetchAndStoreWaitFree()
+{ return true; }
+
+#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
+#define Q_ATOMIC_POINTER_FETCH_AND_STORE_IS_WAIT_FREE
+
+template <typename T>
+Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isFetchAndStoreNative()
+{ return true; }
+template <typename T>
+Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isFetchAndStoreWaitFree()
+{ return true; }
+
+#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; }
+
+inline bool QBasicAtomicInt::ref()
+{
+    return __sync_add_and_fetch(&_q_value, 1);
+}
+
+inline bool QBasicAtomicInt::deref()
+{
+    return __sync_sub_and_fetch(&_q_value, 1);
+}
+
+inline bool QBasicAtomicInt::testAndSetOrdered(int expectedValue, int newValue)
+{
+    return __sync_bool_compare_and_swap(&_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);
+}
+
+inline int QBasicAtomicInt::fetchAndStoreOrdered(int newValue)
+{
+    return __sync_lock_test_and_set(&_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);
+}
+
+inline int QBasicAtomicInt::fetchAndAddOrdered(int valueToAdd)
+{
+    return __sync_fetch_and_add(&_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);
+}
+
+template <typename T>
+Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetOrdered(T *expectedValue, T *newValue)
+{
+    return __sync_bool_compare_and_swap(&_q_value, 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);
+}
+
+template <typename T>
+Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndStoreOrdered(T *newValue)
+{
+    return __sync_lock_test_and_set(&_q_value, 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>::fetchAndAddOrdered(qptrdiff valueToAdd)
+{
+    return __sync_fetch_and_add(&_q_value, valueToAdd * sizeof(T));
+}
+
+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_M68K_H