| /**************************************************************************** |
| ** |
| ** Copyright (C) 2018 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** 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 The Qt Company. For licensing terms |
| ** and conditions see https://www.qt.io/terms-conditions. For further |
| ** information use the contact form at https://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 3 as published by the Free Software |
| ** Foundation and appearing in the file LICENSE.LGPL3 included in the |
| ** packaging of this file. Please review the following information to |
| ** ensure the GNU Lesser General Public License version 3 requirements |
| ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. |
| ** |
| ** GNU General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU |
| ** General Public License version 2.0 or (at your option) the GNU General |
| ** Public license version 3 or any later version approved by the KDE Free |
| ** Qt Foundation. The licenses are as published by the Free Software |
| ** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 |
| ** included in the packaging of this file. Please review the following |
| ** information to ensure the GNU General Public License requirements will |
| ** be met: https://www.gnu.org/licenses/gpl-2.0.html and |
| ** https://www.gnu.org/licenses/gpl-3.0.html. |
| ** |
| ** $QT_END_LICENSE$ |
| ** |
| ****************************************************************************/ |
| |
| #include "qv4functiontable_p.h" |
| |
| #include <assembler/MacroAssemblerCodeRef.h> |
| |
| #include <QtCore/qdebug.h> |
| |
| #include <windows.h> |
| |
| QT_BEGIN_NAMESPACE |
| |
| namespace QV4 { |
| |
| enum UnwindOpcode: UINT8 |
| { |
| UWOP_PUSH_NONVOL = 0, /* info == register number */ |
| UWOP_ALLOC_LARGE, /* no info, alloc size in next 2 slots */ |
| UWOP_ALLOC_SMALL, /* info == size of allocation / 8 - 1 */ |
| UWOP_SET_FPREG, /* no info, FP = RSP + UNWIND_INFO.FPRegOffset*16 */ |
| UWOP_SAVE_NONVOL, /* info == register number, offset in next slot */ |
| UWOP_SAVE_NONVOL_FAR, /* info == register number, offset in next 2 slots */ |
| UWOP_SAVE_XMM128 = 8, /* info == XMM reg number, offset in next slot */ |
| UWOP_SAVE_XMM128_FAR, /* info == XMM reg number, offset in next 2 slots */ |
| UWOP_PUSH_MACHFRAME /* info == 0: no error-code, 1: error-code */ |
| }; |
| |
| enum Register : UINT8 |
| { |
| RAX = 0, |
| RCX, |
| RDX, |
| RBX, |
| RSP, |
| RBP, |
| RSI, |
| RDI, |
| NONE = 15 |
| }; |
| |
| struct UnwindCode |
| { |
| UnwindCode(UINT8 offset, UnwindOpcode operation, Register info) |
| : offset(offset), operation(operation), info(info) |
| {} |
| |
| UINT8 offset; |
| UINT8 operation: 4; |
| UINT8 info: 4; |
| }; |
| |
| struct UnwindInfo |
| { |
| UINT8 Version : 3; |
| UINT8 Flags : 5; |
| UINT8 SizeOfProlog; |
| UINT8 CountOfUnwindCodes; |
| UINT8 FrameRegister : 4; |
| UINT8 FrameRegisterOffset : 4; |
| UnwindCode UnwindCodes[2]; |
| }; |
| |
| struct ExceptionHandlerRecord |
| { |
| RUNTIME_FUNCTION handler; |
| UnwindInfo info; |
| }; |
| |
| void generateFunctionTable(Function *, JSC::MacroAssemblerCodeRef *codeRef) |
| { |
| ExceptionHandlerRecord *record = reinterpret_cast<ExceptionHandlerRecord *>( |
| codeRef->executableMemory()->exceptionHandler()); |
| |
| record->info.Version = 1; |
| record->info.Flags = 0; |
| record->info.SizeOfProlog = 4; |
| record->info.CountOfUnwindCodes = 2; |
| record->info.FrameRegister = RBP; |
| record->info.FrameRegisterOffset = 0; |
| |
| // Push frame pointer |
| record->info.UnwindCodes[1] = UnwindCode(1, UWOP_PUSH_NONVOL, RBP); |
| // Set frame pointer from stack pointer |
| record->info.UnwindCodes[0] = UnwindCode(4, UWOP_SET_FPREG, NONE); |
| |
| const quintptr codeStart = quintptr(codeRef->code().executableAddress()); |
| const quintptr codeSize = codeRef->size(); |
| |
| record->handler.BeginAddress = DWORD(codeStart - quintptr(record)); |
| record->handler.EndAddress = DWORD(codeStart + codeSize - quintptr(record)); |
| record->handler.UnwindData = offsetof(ExceptionHandlerRecord, info); |
| |
| if (!RtlAddFunctionTable(&record->handler, 1, DWORD64(record))) { |
| const unsigned int errorCode = GetLastError(); |
| qWarning() << "Failed to install win64 unwind hook. Error code:" << errorCode; |
| } |
| } |
| |
| void destroyFunctionTable(Function *, JSC::MacroAssemblerCodeRef *codeRef) |
| { |
| ExceptionHandlerRecord *record = reinterpret_cast<ExceptionHandlerRecord *>( |
| codeRef->executableMemory()->exceptionHandler()); |
| if (!RtlDeleteFunctionTable(&record->handler)) { |
| const unsigned int errorCode = GetLastError(); |
| qWarning() << "Failed to remove win64 unwind hook. Error code:" << errorCode; |
| } |
| } |
| |
| size_t exceptionHandlerSize() |
| { |
| return sizeof(ExceptionHandlerRecord); |
| } |
| |
| } // QV4 |
| |
| QT_END_NAMESPACE |