qt: fix execution on ARC

Even though Qt4 could be built for ARC cores during execution
of Qt4 applications on target issues will happen.

Most notable is will be segfaults due to unaligned access to data,
especially in WebKit applications.

Both patches were submitted upstream and if they ever get accepted
they should be removed from Buildroot.

https://codereview.qt-project.org/#/c/112667
https://codereview.qt-project.org/#/c/112668

[Thomas: renumber patches.]

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Anton Kolesov <akolesov@synopsys.com>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/qt/0006-Add-initial-support-of-ARC-architecture.patch

@@ -0,0 +1,183 @@
+From a695eec2ef21240bbc6cd8cd1bdbab76f8da8dfd Mon Sep 17 00:00:00 2001
+From: Vineet Gupta <vgupta@synopsys.com>
+Date: Wed, 20 May 2015 10:37:25 +0300
+Subject: [PATCH 1/2] Add initial support of ARC architecture
+
+DesignWare ARC 700 and ARC HS38 are families of 32-bit CPUs
+developed by Synopsys, Inc.
+
+This change implements following:
+ [1] Defines ARC as one embedded targets
+ [2] Defines default tools prefixed for ARC like
+     arc-linux-g++ etc
+ [3] Defines "inotify" syscall numbers for ARC
+     (note ARC fully compliant to Linux UAPI headers)
+ [4] Disables 16-bit aligned data access
+
+For now we're using generic atomic ops even though it may
+introduce performance panalty.
+
+Change-Id: I91e879ac55c2f3643a544f97cd59671a81ccc3c2
+
+This patch was submited in upstream Qt4 and if it ever gets accepted,
+it should be removed from Buildroot.
+
+https://codereview.qt-project.org/#/c/112667
+---
+ configure                                     |  6 ++++
+ mkspecs/qws/linux-arc-g++/qmake.conf          | 21 ++++++++++++++
+ mkspecs/qws/linux-arc-g++/qplatformdefs.h     | 42 +++++++++++++++++++++++++++
+ src/corelib/arch/qatomic_arch.h               |  2 ++
+ src/corelib/io/qfilesystemwatcher_inotify.cpp |  5 ++++
+ src/gui/painting/qblendfunctions.cpp          |  4 +--
+ 6 files changed, 78 insertions(+), 2 deletions(-)
+ create mode 100644 mkspecs/qws/linux-arc-g++/qmake.conf
+ create mode 100644 mkspecs/qws/linux-arc-g++/qplatformdefs.h
+
+diff --git a/configure b/configure
+index 10ad7ca..c7ef074 100755
+--- a/configure
++++ b/configure
+@@ -2829,6 +2829,9 @@ if [ "$CFG_EMBEDDED" != "no" ]; then
+                     *86_64)
+                         CFG_EMBEDDED=x86_64
+                         ;;
++                    *arc)
++                        CFG_EMBEDDED=arc
++                        ;;
+                     *)
+                         CFG_EMBEDDED=generic
+                         ;;
+@@ -3309,6 +3312,9 @@ if [ "$PLATFORM" != "$XPLATFORM" -a "$CFG_EMBEDDED" != "no" ]; then
+     arm*)
+         CFG_ARCH=arm
+         ;;
++    arc)
++        CFG_ARCH=arc
++        ;;
+     *)
+         CFG_ARCH="$CFG_EMBEDDED"
+         ;;
+diff --git a/mkspecs/qws/linux-arc-g++/qmake.conf b/mkspecs/qws/linux-arc-g++/qmake.conf
+new file mode 100644
+index 0000000..a14587b
+--- /dev/null
++++ b/mkspecs/qws/linux-arc-g++/qmake.conf
+@@ -0,0 +1,21 @@
++#
++# qmake configuration for building with arc-linux-g++
++#
++
++include(../../common/linux.conf)
++include(../../common/gcc-base-unix.conf)
++include(../../common/g++-unix.conf)
++include(../../common/qws.conf)
++
++# modifications to g++.conf
++QMAKE_CC                = arc-linux-gcc
++QMAKE_CXX               = arc-linux-g++
++QMAKE_LINK              = arc-linux-g++
++QMAKE_LINK_SHLIB        = arc-linux-g++
++
++# modifications to linux.conf
++QMAKE_AR                = arc-linux-ar cqs
++QMAKE_OBJCOPY           = arc-linux-objcopy
++QMAKE_STRIP             = arc-linux-strip
++
++load(qt_config)
+diff --git a/mkspecs/qws/linux-arc-g++/qplatformdefs.h b/mkspecs/qws/linux-arc-g++/qplatformdefs.h
+new file mode 100644
+index 0000000..a654aa7
+--- /dev/null
++++ b/mkspecs/qws/linux-arc-g++/qplatformdefs.h
+@@ -0,0 +1,42 @@
++/****************************************************************************
++**
++** Copyright (C) 2015 The Qt Company Ltd.
++** Contact: http://www.qt.io/licensing/
++**
++** This file is part of the qmake spec 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 The Qt Company. For licensing terms
++** and conditions see http://www.qt.io/terms-conditions. For further
++** information use the contact form at http://www.qt.io/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 or version 3 as published by the Free
++** Software Foundation and appearing in the file LICENSE.LGPLv21 and
++** LICENSE.LGPLv3 included in the packaging of this file. Please review the
++** following information to ensure the GNU Lesser General Public License
++** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
++** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
++**
++** As a special exception, The Qt Company gives you certain additional
++** rights. These rights are described in The Qt Company 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.
++**
++** $QT_END_LICENSE$
++**
++****************************************************************************/
++
++#include "../../linux-g++/qplatformdefs.h"
+diff --git a/src/corelib/arch/qatomic_arch.h b/src/corelib/arch/qatomic_arch.h
+index d154b7e..a48c42a 100644
+--- a/src/corelib/arch/qatomic_arch.h
++++ b/src/corelib/arch/qatomic_arch.h
+@@ -94,6 +94,8 @@ QT_BEGIN_HEADER
+ #  include "QtCore/qatomic_sh4a.h"
+ #elif defined(QT_ARCH_NACL)
+ #  include "QtCore/qatomic_generic.h"
++#elif defined(QT_ARCH_ARC)
++#  include "QtCore/qatomic_generic.h"
+ #else
+ #  error "Qt has not been ported to this architecture"
+ #endif
+diff --git a/src/corelib/io/qfilesystemwatcher_inotify.cpp b/src/corelib/io/qfilesystemwatcher_inotify.cpp
+index 8bca422..e3e2565 100644
+--- a/src/corelib/io/qfilesystemwatcher_inotify.cpp
++++ b/src/corelib/io/qfilesystemwatcher_inotify.cpp
+@@ -143,6 +143,11 @@
+ # define __NR_inotify_add_watch 27
+ # define __NR_inotify_rm_watch  28
+ // no inotify_init for aarch64
++#elif defined (__arc__)
++# define __NR_inotify_init      1043
++# define __NR_inotify_add_watch 27
++# define __NR_inotify_rm_watch  28
++# define __NR_inotify_init1     26
+ #else
+ # error "This architecture is not supported. Please talk to qt-bugs@trolltech.com"
+ #endif
+diff --git a/src/gui/painting/qblendfunctions.cpp b/src/gui/painting/qblendfunctions.cpp
+index de8790a..cc2f5b6 100644
+--- a/src/gui/painting/qblendfunctions.cpp
++++ b/src/gui/painting/qblendfunctions.cpp
+@@ -309,9 +309,9 @@ template <typename T> void qt_blend_argb24_on_rgb16(uchar *destPixels, int dbpl,
+         const uchar *src = srcPixels + y * sbpl;
+         const uchar *srcEnd = src + srcOffset;
+         while (src < srcEnd) {
+-#if defined(QT_ARCH_ARMV5) || defined(QT_ARCH_POWERPC) || defined(QT_ARCH_SH) || defined(QT_ARCH_AVR32) || (defined(QT_ARCH_WINDOWSCE) && !defined(_X86_)) || (defined(QT_ARCH_SPARC) && defined(Q_CC_GNU)) || (defined(QT_ARCH_INTEGRITY) && !defined(_X86_))
++#if defined(QT_ARCH_ARMV5) || defined(QT_ARCH_POWERPC) || defined(QT_ARCH_SH) || defined(QT_ARCH_AVR32) || (defined(QT_ARCH_WINDOWSCE) && !defined(_X86_)) || (defined(QT_ARCH_SPARC) && defined(Q_CC_GNU)) || (defined(QT_ARCH_INTEGRITY) && !defined(_X86_)) || defined(QT_ARCH_ARC)
+             // non-16-bit aligned memory access is not possible on PowerPC,
+-            // ARM <v6 (QT_ARCH_ARMV5) & SH & AVR32 & SPARC w/GCC
++            // ARM <v6 (QT_ARCH_ARMV5) & SH & AVR32 & SPARC w/GCC & ARC
+             quint16 spix = (quint16(src[2])<<8) + src[1];
+ #else
+             quint16 spix = *(quint16 *) (src + 1);
+-- 
+2.1.0
+

package/qt/0007-Prevent-unaligned-access-on-ARC.patch

@@ -0,0 +1,92 @@
+From 9392d29bf0ad0390c6895933fdec0f690d2bdedf Mon Sep 17 00:00:00 2001
+From: Alexey Brodkin <abrodkin@synopsys.com>
+Date: Wed, 20 May 2015 10:53:59 +0300
+Subject: [PATCH 2/2] Prevent unaligned access on ARC
+
+As many other architectures ARC cores by default don't support
+unaligned word access to data.
+
+Even though it's possible to enable unaligned access to data in
+ARC HS38 core (we're talking about configuration of core design)
+to make sure Qt could be executed on any flavour of ARC fall-back
+to byte-accesses is used.
+
+Change-Id: I96068d40b449f11ba987ed1e5d5e44f493d1eb5f
+
+This patch was submited in upstream Qt4 and if it ever gets accepted,
+it should be removed from Buildroot.
+
+https://codereview.qt-project.org/#/c/112668
+---
+ src/3rdparty/webkit/Source/JavaScriptCore/runtime/UString.h |  2 +-
+ src/3rdparty/webkit/Source/JavaScriptCore/wtf/Platform.h    | 13 ++++++++++++-
+ .../webkit/Source/JavaScriptCore/wtf/text/AtomicString.cpp  |  2 +-
+ .../webkit/Source/JavaScriptCore/wtf/text/StringHash.h      |  2 +-
+ 4 files changed, 15 insertions(+), 4 deletions(-)
+
+diff --git a/src/3rdparty/webkit/Source/JavaScriptCore/runtime/UString.h b/src/3rdparty/webkit/Source/JavaScriptCore/runtime/UString.h
+index 2d76809..ee9b7f0 100644
+--- a/src/3rdparty/webkit/Source/JavaScriptCore/runtime/UString.h
++++ b/src/3rdparty/webkit/Source/JavaScriptCore/runtime/UString.h
+@@ -202,7 +202,7 @@ struct UStringHash {
+ 
+         // FIXME: perhaps we should have a more abstract macro that indicates when
+         // going 4 bytes at a time is unsafe
+-#if CPU(ARM) || CPU(SH4) || CPU(MIPS) || CPU(SPARC)
++#if CPU(ARM) || CPU(SH4) || CPU(MIPS) || CPU(SPARC) || CPU(ARC)
+         const UChar* aChars = a->characters();
+         const UChar* bChars = b->characters();
+         for (unsigned i = 0; i != aLength; ++i) {
+diff --git a/src/3rdparty/webkit/Source/JavaScriptCore/wtf/Platform.h b/src/3rdparty/webkit/Source/JavaScriptCore/wtf/Platform.h
+index e8b03be..cd17e9c 100644
+--- a/src/3rdparty/webkit/Source/JavaScriptCore/wtf/Platform.h
++++ b/src/3rdparty/webkit/Source/JavaScriptCore/wtf/Platform.h
+@@ -369,7 +369,18 @@
+ 
+ #endif /* ARM */
+ 
+-#if CPU(ARM) || CPU(MIPS) || CPU(SH4)
++/* CPU(ARC) - ARC, any version*/
++#if   defined(arc) \
++    || defined(__arc__) \
++    || defined(ARC) \
++    || defined(_ARC_)
++#define WTF_CPU_ARC 1
++#if defined(__BIG_ENDIAN__)
++#define WTF_CPU_BIG_ENDIAN 1
++#endif
++#endif
++
++#if CPU(ARM) || CPU(MIPS) || CPU(SH4) || CPU(ARC)
+ #define WTF_CPU_NEEDS_ALIGNED_ACCESS 1
+ #endif
+ 
+diff --git a/src/3rdparty/webkit/Source/JavaScriptCore/wtf/text/AtomicString.cpp b/src/3rdparty/webkit/Source/JavaScriptCore/wtf/text/AtomicString.cpp
+index 9dd655e..bd3ab95 100644
+--- a/src/3rdparty/webkit/Source/JavaScriptCore/wtf/text/AtomicString.cpp
++++ b/src/3rdparty/webkit/Source/JavaScriptCore/wtf/text/AtomicString.cpp
+@@ -142,7 +142,7 @@ static inline bool equal(StringImpl* string, const UChar* characters, unsigned l
+ 
+     // FIXME: perhaps we should have a more abstract macro that indicates when
+     // going 4 bytes at a time is unsafe
+-#if CPU(ARM) || CPU(SH4) || CPU(MIPS) || CPU(SPARC)
++#if CPU(ARM) || CPU(SH4) || CPU(MIPS) || CPU(SPARC) || CPU(ARC)
+     const UChar* stringCharacters = string->characters();
+     for (unsigned i = 0; i != length; ++i) {
+         if (*stringCharacters++ != *characters++)
+diff --git a/src/3rdparty/webkit/Source/JavaScriptCore/wtf/text/StringHash.h b/src/3rdparty/webkit/Source/JavaScriptCore/wtf/text/StringHash.h
+index 4637c3d..91cef81 100644
+--- a/src/3rdparty/webkit/Source/JavaScriptCore/wtf/text/StringHash.h
++++ b/src/3rdparty/webkit/Source/JavaScriptCore/wtf/text/StringHash.h
+@@ -55,7 +55,7 @@ namespace WTF {
+ 
+             // FIXME: perhaps we should have a more abstract macro that indicates when
+             // going 4 bytes at a time is unsafe
+-#if CPU(ARM) || CPU(SH4) || CPU(MIPS) || CPU(SPARC)
++#if CPU(ARM) || CPU(SH4) || CPU(MIPS) || CPU(SPARC) || CPU(ARC)
+             const UChar* aChars = a->characters();
+             const UChar* bChars = b->characters();
+             for (unsigned i = 0; i != aLength; ++i) {
+-- 
+2.1.0
+