Michael Fabian Dirks
64 lines
2.7 KiB
C++
64 lines
2.7 KiB
C++
// BlitzPointer - Adding Pointers to Blitz.
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// Copyright (C) 2015 Project Kube (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://project-kube.de>
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#include "BlitzPointer.h"
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DLL_EXPORT intptr_t BlitzPointer_GetReturnAddress() {
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intptr_t StackPointer, ReturnAddress;
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__asm { //ASM. Do touch if suicidal.
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mov StackPointer, esp; // Store current Stack Pointer
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mov esp, ebp; // On X86, EBP[0] is our own function and EBP[1] is the return address.
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add esp, 4; // Which means that we can just take it from there into our own variable.
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pop ReturnAddress; // Just like this.
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mov esp, [StackPointer]; // And then reset the Stack Pointer.
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}
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return ReturnAddress;
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}
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#pragma comment(linker, "/EXPORT:BlitzPointer_GetReturnAddress=_BlitzPointer_GetReturnAddress@0")
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DLL_EXPORT intptr_t BlitzPointer_GetFunctionPointer()
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{
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intptr_t StackPointer, ReturnAddress;
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__asm { //ASM. Do touch if suicidal.
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mov StackPointer, esp; // Store current Stack Pointer
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mov esp, ebp; // On X86, EBP[0] is our own function and EBP[1] is the return address.
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add esp, 4; // Which means that we can just take it from there into our own variable.
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pop ReturnAddress; // Just like this.
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mov esp, [StackPointer]; // And then reset the Stack Pointer.
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}
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// Let's look backwards in memory for the function signature (0x53 0x56 0x57 0x55 0x89 0xE5) for at most one megabyte.
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uint8_t* startPtr = (uint8_t*)ReturnAddress;
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uint8_t* endPtr = (uint8_t*)(ReturnAddress - 1048576);
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for (uint8_t* curPtr = startPtr; curPtr != endPtr; curPtr--) {
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if (*(curPtr) == 0x53) // push ebx
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if (*(curPtr + 1) == 0x56) // push esi
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if (*(curPtr + 2) == 0x57) // push edi
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if (*(curPtr + 3) == 0x55) // push ebp
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if (*(curPtr + 4) == 0x89 && *(curPtr + 5) == 0xE5) // mov ebp,esp
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return (intptr_t)curPtr;
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}
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return 0;
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}
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#pragma comment(linker, "/EXPORT:BlitzPointer_GetFunctionPointer=_BlitzPointer_GetFunctionPointer@0")
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