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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#include <sal/config.h>
#include <memory>
#include <malloc.h>
#include <new.h>
#include <typeinfo>
#include <signal.h>
#include <rtl/alloc.h>
#include <rtl/strbuf.hxx>
#include <rtl/ustrbuf.hxx>
#include <sal/log.hxx>
#include <com/sun/star/uno/Any.hxx>
#include <msvc/arm64.hxx>
#include <except.hxx>
#pragma pack(push, 8)
using namespace ::com::sun::star;
static void* __cdecl copyConstruct(void* pExcThis, void* pSource,
typelib_TypeDescription* pTD) noexcept
{
::uno_copyData(pExcThis, pSource, pTD, uno::cpp_acquire);
return pExcThis;
}
static void* __cdecl destruct(void* pExcThis, typelib_TypeDescription* pTD) noexcept
{
::uno_destructData(pExcThis, pTD, uno::cpp_release);
return pExcThis;
}
const int nCodeSnippetSize = 28;
static void GenerateCopyConstructorTrampoline(unsigned char* target,
typelib_TypeDescription* pTD) noexcept
{
// ldr x2, #12
// ldr x3, #20
// br x3
// pTD
// ©Construct
static const char code[] = "\x62\x00\x00\x58\x83\x00\x00\x58\x60\x00\x1f\xd6";
static_assert(sizeof(code) == 13);
static const unsigned int code_size = sizeof(code) - 1;
memcpy(target, code, code_size);
*reinterpret_cast<void**>(target + code_size) = pTD;
*reinterpret_cast<void**>(target + code_size + 8) = ©Construct;
}
static void GenerateDestructorTrampoline(unsigned char* target,
typelib_TypeDescription* pTD) noexcept
{
// ldr x1, #12
// ldr x2, #20
// br x2
// pTD
// &destruct
static const char code[] = "\x61\x00\x00\x58\x82\x00\x00\x58\x40\x00\x1f\xd6";
static_assert(sizeof(code) == 13);
static const unsigned int code_size = sizeof(code) - 1;
memcpy(target, code, code_size);
*reinterpret_cast<void**>(target + code_size) = pTD;
*reinterpret_cast<void**>(target + code_size + 8) = &destruct;
}
ExceptionType::ExceptionType(unsigned char* pCode, sal_uInt64 pCodeBase,
typelib_TypeDescription* pTD) noexcept
: _n0(0)
, _n1(0)
, _n2(-1)
, _n3(0)
, _n4(pTD->nSize)
, exc_type_info(nullptr, "")
{
// As _n0 is always initialized to zero, that means the
// hasvirtbase flag (see the ONTL catchabletype struct) is
// off, and thus the copyctor is of the ctor_ptr kind.
int len;
type_info* pRTTI = RTTInfos::get(pTD->pTypeName, &len);
memcpy(static_cast<void*>(&exc_type_info), static_cast<void*>(pRTTI), len);
_pTypeInfo = static_cast<sal_uInt32>(reinterpret_cast<sal_uInt64>(&exc_type_info) - pCodeBase);
GenerateCopyConstructorTrampoline(pCode, pTD);
assert(pCodeBase <= reinterpret_cast<sal_uInt64>(pCode)
&& (reinterpret_cast<sal_uInt64>(pCode) - pCodeBase < 0x100000000));
_pCopyCtor = static_cast<sal_uInt32>(reinterpret_cast<sal_uInt64>(pCode) - pCodeBase);
}
/* Rewrite of 32-Bit-Code to work under 64 Bit:
* To use the 32 Bit offset values in the ExceptionType we have to
* allocate a single allocation block and use it for all code and date
* all offsets inside this area are guaranteed to be in 32 bit address range.
* So we have to calc total memory allocation size for D-tor, C-Tors,
* ExceptionType and type_info. ExceptionType is allocated via placement new
* to locate everything inside our mem block.
* There is one caveat: Struct type_info is kept in
* a map and was referenced from class ExceptionType. Therefore type_info now
* is also member of ExceptionType and can be referenced via 32 bit offset.
*/
RaiseInfo::RaiseInfo(typelib_TypeDescription* pTD) noexcept
: _n0(0)
, _n2(0)
, _pTD(pTD)
{
typelib_CompoundTypeDescription* pCompTD;
// Count how many trampolines we need
int codeSize = nCodeSnippetSize;
// Info count
int nLen = 0;
for (pCompTD = reinterpret_cast<typelib_CompoundTypeDescription*>(pTD); pCompTD;
pCompTD = pCompTD->pBaseTypeDescription)
{
++nLen;
codeSize += nCodeSnippetSize;
}
// Array with size (4) and all _pTypeInfo (4*nLen)
int typeInfoArraySize = 4 + 4 * nLen;
// 2.Pass: Get the total needed memory for class ExceptionType
// (with embedded type_info) and keep the sizes for each instance
// is stored in allocated int array
auto exceptionTypeSizeArray = std::make_unique<int[]>(nLen);
nLen = 0;
for (pCompTD = reinterpret_cast<typelib_CompoundTypeDescription*>(pTD); pCompTD;
pCompTD = pCompTD->pBaseTypeDescription)
{
int typeInfoLen;
RTTInfos::get(pCompTD->aBase.pTypeName, &typeInfoLen);
// Mem has to be on 4-byte Boundary
if (typeInfoLen % 4 != 0)
{
int n = typeInfoLen / 4;
n++;
typeInfoLen = n * 4;
}
exceptionTypeSizeArray[nLen++] = typeInfoLen + sizeof(ExceptionType);
}
// Total ExceptionType related mem
int excTypeAddLen = 0;
for (int i = 0; i < nLen; i++)
{
excTypeAddLen += exceptionTypeSizeArray[i];
}
// Allocate mem for code and all dynamic data in one chunk to guarantee
// 32 bit offsets
const int totalSize = codeSize + typeInfoArraySize + excTypeAddLen;
unsigned char* pCode = _code = static_cast<unsigned char*>(std::malloc(totalSize));
int pCodeOffset = 0;
// New base of types array, starts after Trampoline D-Tor / C-Tors
DWORD* types = reinterpret_cast<DWORD*>(pCode + codeSize);
// New base of ExceptionType array, starts after types array
unsigned char* etMem = pCode + codeSize + typeInfoArraySize;
int etMemOffset = 0;
_codeBase = reinterpret_cast<sal_uInt64>(pCode)
& ~static_cast<sal_uInt64>(ExceptionInfos::allocationGranularity - 1);
DWORD old_protect;
bool success = VirtualProtect(pCode, codeSize, PAGE_EXECUTE_READWRITE, &old_protect);
(void)success;
assert(success && "VirtualProtect() failed!");
::typelib_typedescription_acquire(pTD);
// Fill pCode with D-Tor code
GenerateDestructorTrampoline(pCode, pTD);
_pDtor = static_cast<sal_Int32>(reinterpret_cast<sal_uInt64>(pCode) - _codeBase);
pCodeOffset += nCodeSnippetSize;
// Info count accompanied by type info ptrs: type, base type, base base type, ...
// Keep offset of types_array
_types = static_cast<sal_Int32>(reinterpret_cast<sal_uInt64>(types) - _codeBase);
// Fill types: (nLen, _offset to ExceptionType1, ...ExceptionType2, ...)
types[0] = nLen;
int nPos = 1;
for (pCompTD = reinterpret_cast<typelib_CompoundTypeDescription*>(pTD); pCompTD;
pCompTD = pCompTD->pBaseTypeDescription)
{
// Create instance in mem block with placement new
ExceptionType* et = new (etMem + etMemOffset) ExceptionType(
pCode + pCodeOffset, _codeBase, reinterpret_cast<typelib_TypeDescription*>(pCompTD));
// Next trampoline entry offset
pCodeOffset += nCodeSnippetSize;
// Next ExceptionType placement offset
etMemOffset += exceptionTypeSizeArray[nPos - 1];
// Keep offset of addresses of ET for D-Tor call in ~RaiseInfo
types[nPos++] = static_cast<DWORD>(reinterpret_cast<sal_uInt64>(et) - _codeBase);
}
// Final check: end of address calculation must be end of mem
assert(etMem + etMemOffset == pCode + totalSize);
}
#pragma pack(pop)
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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