diff options
author | Ulf Hermann <ulf.hermann@qt.io> | 2018-11-08 18:09:21 +0100 |
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committer | Ulf Hermann <ulf.hermann@qt.io> | 2018-12-03 08:28:36 +0000 |
commit | 74d23ca548b47c85c4b8cdde5fd5a9026e4eb08c (patch) | |
tree | caf94cffe04b7c6235ccfd5f117b17187733752b /src/qml/jsruntime/qv4functiontable_win64.cpp | |
parent | faf99c36d29bfad629fb6ec541ccc2f61ef93443 (diff) |
V4: Generate function tables on 64bit windows
In order for global exception handlers to be called reliably, the runtime
needs to unwind through JIT-generated code. This can be facilitated by
installing a "function table" for each JITed function that specifies "use
the frame pointer".
Also make sure to generate a function table for JIT'ed regular
expressions. Those were forgotten also in the linux case.
Fixes: QTBUG-50061
Change-Id: Ib0b8ae9356ed80afe1cab017e36efa4ccbe73f90
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
Diffstat (limited to 'src/qml/jsruntime/qv4functiontable_win64.cpp')
-rw-r--r-- | src/qml/jsruntime/qv4functiontable_win64.cpp | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/src/qml/jsruntime/qv4functiontable_win64.cpp b/src/qml/jsruntime/qv4functiontable_win64.cpp new file mode 100644 index 0000000000..bc5b24f6cd --- /dev/null +++ b/src/qml/jsruntime/qv4functiontable_win64.cpp @@ -0,0 +1,153 @@ +/**************************************************************************** +** +** 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 |