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-/****************************************************************************
-**
-** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
-** Contact: http://www.qt-project.org/legal
-**
-** This file is part of the QtQml 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 QV4UNWINDHELPER_ARM_P_H
-#define QV4UNWINDHELPER_ARM_P_H
-
-#include "qv4unwindhelper_p.h"
-#include "qv4functionobject_p.h"
-#include "qv4function_p.h"
-#include <wtf/Platform.h>
-
-#include <QMap>
-#include <QMutex>
-
-#define __USE_GNU
-#include <dlfcn.h>
-
-#if USE(LIBUNWIND_DEBUG)
-#include <libunwind.h>
-#include <execinfo.h>
-#endif
-
-QT_BEGIN_NAMESPACE
-
-namespace QV4 {
-
-static void *removeThumbBit(void *addr)
-{
- return reinterpret_cast<void*>(reinterpret_cast<qintptr>(addr) & ~1u);
-}
-
-static QMutex functionProtector;
-static QMap<quintptr, Function*> allFunctions;
-
-static Function *lookupFunction(void *pc)
-{
- quintptr key = reinterpret_cast<quintptr>(pc);
- QMap<quintptr, Function*>::Iterator it = allFunctions.lowerBound(key);
- if (it != allFunctions.begin() && allFunctions.count() > 0)
- --it;
- if (it == allFunctions.end())
- return 0;
-
- quintptr codeStart = reinterpret_cast<quintptr>(removeThumbBit((void*)(*it)->codePtr));
- if (key < codeStart || key >= codeStart + (*it)->codeSize)
- return 0;
- return *it;
-}
-
-
-/* Program:
-vsp = r4 (REG_TO_SP r4)
-vsp -= 8 * 4 -- > vsp = vsp - (7 << 2) - 4
-pop r12, r10, r9, r8, r7, r6, r5, r4
-pop r4
-pop lr
-pop r0, r1, r2, r3
-*/
-
-#define REG_TO_SP ((unsigned int) 0b10010000)
-#define VSP_MINUS ((unsigned int) 0b01000000)
-#define POP_REG_MULTI ((unsigned int) 0b10000000)
-#define POP_R4_MULTI ((unsigned int) 0b10100000)
-#define POP_R4_R14_MULTI ((unsigned int) 0b10101000)
-#define POP_R0_TO_R3 ((unsigned int) 0b10110001)
-#define FINISH ((unsigned int) 0b10110000)
-
-#define MK_UW_WORD(first, second, third, fourth) \
- (((first) << 24) | \
- ((second) << 16) | \
- ((third) << 8) | \
- (fourth))
-
-static unsigned int extbl[] = {
- MK_UW_WORD(0x80 | // High bit set to indicate that this isn't a PREL31
- 2, // Choose personality routine #2
- 2, // Number of 4 byte words used to encode remaining unwind instructions
- REG_TO_SP | 4, // Encoded program from above.
- VSP_MINUS | 7),
- MK_UW_WORD(POP_REG_MULTI | 1, 0b01111111,
- POP_R4_R14_MULTI,
- POP_R0_TO_R3),
- MK_UW_WORD(0b00001111,
- FINISH,
- FINISH,
- FINISH),
- 0 // no additional entries
-};
-
-static unsigned write_prel31(unsigned *addr, void *ptr)
-{
- int delta = (char *)ptr - (char*)addr;
- if (delta < 0)
- delta |= (1 << 30);
- else
- delta &= ~(1 << 30);
- *addr = ((unsigned)delta) & 0x7fffffffU;
-}
-
-void UnwindHelper::deregisterFunction(Function *function)
-{
- QMutexLocker locker(&functionProtector);
- allFunctions.remove(reinterpret_cast<quintptr>(function->codePtr));
-}
-
-void UnwindHelper::deregisterFunctions(const QVector<Function *> &functions)
-{
- QMutexLocker locker(&functionProtector);
- foreach (Function *f, functions)
- allFunctions.remove(reinterpret_cast<quintptr>(f->codePtr));
-}
-
-void UnwindHelper::registerFunction(Function *function)
-{
- QMutexLocker locker(&functionProtector);
- allFunctions.insert(reinterpret_cast<quintptr>(function->codePtr), function);
-}
-
-void UnwindHelper::registerFunctions(const QVector<Function *> &functions)
-{
- QMutexLocker locker(&functionProtector);
- foreach (Function *f, functions)
- allFunctions.insert(reinterpret_cast<quintptr>(f->codePtr), f);
-}
-
-void UnwindHelper::prepareForUnwind(ExecutionContext *)
-{
-}
-
-int UnwindHelper::unwindInfoSize()
-{
- return 2 * sizeof(unsigned int) // 2 extbl entries
- + sizeof(extbl);
-}
-
-void UnwindHelper::writeARMUnwindInfo(void *codeAddr, int codeSize)
-{
- unsigned int *exidx = (unsigned int *)((char *)codeAddr + codeSize);
-
- unsigned char *exprog = (unsigned char *)((unsigned char *)codeAddr + codeSize + 8);
-
- write_prel31(exidx, codeAddr);
- exidx[1] = 4; // PREL31 offset to extbl, which follows right afterwards
-
- memcpy(exprog, extbl, sizeof(extbl));
-
-#if USE(LIBUNWIND_DEBUG)
- unw_dyn_info_t *info = (unw_dyn_info_t*)malloc(sizeof(unw_dyn_info_t));
- info->start_ip = (unw_word_t)codeAddr;
- info->end_ip = info->start_ip + codeSize;
- info->gp = 0;
- info->format = UNW_INFO_FORMAT_ARM_EXIDX;
- info->u.rti.name_ptr = 0;
- info->u.rti.segbase = 0;
- info->u.rti.table_len = 8;
- info->u.rti.table_data = (unw_word_t)exidx;
- _U_dyn_register(info);
-#endif
-}
-
-}
-
-QT_END_NAMESPACE
-
-#if defined(Q_OS_ANDROID)
-extern "C" void *dl_unwind_find_exidx(void *pc, int *entryCount);
-#endif
-
-extern "C" Q_DECL_EXPORT void *__gnu_Unwind_Find_exidx(void *pc, int *entryCount)
-{
-#if !defined(Q_OS_ANDROID)
- typedef void *(*Old_Unwind_Find_exidx)(void*, int*);
- static Old_Unwind_Find_exidx oldFunction = 0;
- if (!oldFunction)
- oldFunction = (Old_Unwind_Find_exidx)dlsym(RTLD_NEXT, "__gnu_Unwind_Find_exidx");
-#endif
-
- {
- QMutexLocker locker(&QT_PREPEND_NAMESPACE(QV4::functionProtector));
- QV4::Function *function = QT_PREPEND_NAMESPACE(QV4::lookupFunction(pc));
- if (function) {
- *entryCount = 1;
- void * codeStart = QT_PREPEND_NAMESPACE(QV4::removeThumbBit((void*)function->codePtr));
- // At the end of the function we store our synthetic exception table entry.
- return (char *)codeStart + function->codeSize;
- }
- }
-
-#if defined(Q_OS_ANDROID)
- return dl_unwind_find_exidx(pc, entryCount);
-#else
- return oldFunction(pc, entryCount);
-#endif
-}
-
-#endif // QV4UNWINDHELPER_PDW2_H
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