Michael Dirks
124 lines
5.0 KiB
C++
124 lines
5.0 KiB
C++
// BlitzPointer - Adding Pointers to Blitz.
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// Copyright (C) 2015 Xaymar (Michael Fabian Dirks)
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation, either version 3 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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// Idea take from Code by Noodoby<http://www.blitzforum.de/forum/viewtopic.php?t=31651>
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// New Code by Xaymar<http://xaymar.com>
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#pragma once
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#include "BlitzPointer.h"
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DLL_METHOD intptr_t DLL_CALL BP_GetReturnAddress() {
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intptr_t BasePointer, ReturnAddress;
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__asm { //ASM. Do touch if suicidal.
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mov BasePointer, ebp; // Store current BasePointer
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}
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// Blitz uses X86 Call-Near (E8) instructions to call its own functions.
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// We can simply deduce the Return Address like this because of that.
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ReturnAddress = *reinterpret_cast<intptr_t*>(*reinterpret_cast<intptr_t*>(*reinterpret_cast<intptr_t*>(BasePointer)) - 8);
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return ReturnAddress;
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}
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#pragma comment(linker, "/EXPORT:BP_GetReturnAddress=_BP_GetReturnAddress@0")
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DLL_METHOD intptr_t DLL_CALL BP_GetFunctionPointer()
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{
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intptr_t BasePointer, ReturnAddress, FunctionPointer;
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__asm { //ASM. Do touch if suicidal.
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mov BasePointer, ebp; // Store current BasePointer
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}
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// Blitz uses X86 Call-Near (E8) instructions to call its own functions.
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// We can simply deduce the Return Address like this because of that.
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ReturnAddress = *reinterpret_cast<intptr_t*>(*reinterpret_cast<intptr_t*>(*reinterpret_cast<intptr_t*>(BasePointer)) - 8);
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// And since it's a Call-Near, the call is offset to the return address.
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FunctionPointer = ReturnAddress + *reinterpret_cast<intptr_t*>(ReturnAddress - 4);
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return FunctionPointer;
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}
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#pragma comment(linker, "/EXPORT:BP_GetFunctionPointer=_BP_GetFunctionPointer@0")
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// Didn't work out, overloading a Runtime Function makes it disappear.
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/*DLL_METHOD intptr_t DLL_CALL BP_GetLastCalledFunctionPointer( )
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{
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// Scan backwards in executable memory for a eax assign.
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return 0;
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}
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#pragma comment(linker, "/EXPORT:BP_GetLastCalledFunctionPointer=_BP_GetLastCalledFunctionPointer@0")
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DLL_METHOD intptr_t DLL_CALL BP_GetNextCalledFunctionPointer()
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{
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// Scan forwards in executable memory for a eax assign.
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return 0;
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}
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#pragma comment(linker, "/EXPORT:BP_GetNextCalledFunctionPointer=_BP_GetNextCalledFunctionPointer@0")*/
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DLL_METHOD intptr_t DLL_CALL BP_GetVariablePointer(int32_t pVariable)
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{
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intptr_t BasePointer;
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__asm { //ASM. Do touch if suicidal.
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mov BasePointer, ebp; // Store current BasePointer
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}
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// The Variable pointer that is used is at -9 bytes offset to the return address.
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return *reinterpret_cast<int32_t*>(*reinterpret_cast<intptr_t*>(BasePointer + 4) - 9);
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}
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#pragma comment(linker, "/EXPORT:BP_GetVariablePointer=_BP_GetVariablePointer@4")
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DLL_METHOD intptr_t DLL_CALL BP_GetVariablePointerType( int32_t pVariable ) {
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intptr_t BasePointer;
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__asm { //ASM. Do touch if suicidal.
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mov BasePointer, ebp; // Store current BasePointer
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}
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// The Variable pointer that is used is at -11 bytes offset to the return address.
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return *reinterpret_cast<int32_t*>(*reinterpret_cast<intptr_t*>(BasePointer + 4) - 11);
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}
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#pragma comment(linker, "/EXPORT:BP_GetVariablePointerType=_BP_GetVariablePointerType@4")
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DLL_METHOD int32_t DLL_CALL BP_CallFunction0(BP_BlitzFunction0_t lpFunctionPointer) {
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return lpFunctionPointer();
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}
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#pragma comment(linker, "/EXPORT:BP_CallFunction0=_BP_CallFunction0@4")
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DLL_METHOD int32_t DLL_CALL BP_CallFunction1(BP_BlitzFunction1_t lpFunctionPointer, int32_t p1) {
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return lpFunctionPointer(p1);
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}
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#pragma comment(linker, "/EXPORT:BP_CallFunction1=_BP_CallFunction1@8")
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DLL_METHOD int32_t DLL_CALL BP_CallFunction2(BP_BlitzFunction2_t lpFunctionPointer, int32_t p1, int32_t p2) {
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return lpFunctionPointer(p1, p2);
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}
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#pragma comment(linker, "/EXPORT:BP_CallFunction2=_BP_CallFunction2@12")
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DLL_METHOD int32_t DLL_CALL BP_CallFunction3(BP_BlitzFunction3_t lpFunctionPointer, int32_t p1, int32_t p2, int32_t p3) {
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return lpFunctionPointer(p1, p2, p3);
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}
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#pragma comment(linker, "/EXPORT:BP_CallFunction3=_BP_CallFunction3@16")
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DLL_METHOD int32_t DLL_CALL BP_CallFunction4(BP_BlitzFunction4_t lpFunctionPointer, int32_t p1, int32_t p2, int32_t p3, int32_t p4) {
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return lpFunctionPointer(p1, p2, p3, p4);
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}
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#pragma comment(linker, "/EXPORT:BP_CallFunction4=_BP_CallFunction4@20")
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DLL_METHOD int32_t DLL_CALL BP_CallFunction5(BP_BlitzFunction5_t lpFunctionPointer, int32_t p1, int32_t p2, int32_t p3, int32_t p4, int32_t p5) {
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return lpFunctionPointer(p1, p2, p3, p4, p5);
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}
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#pragma comment(linker, "/EXPORT:BP_CallFunction5=_BP_CallFunction5@24") |