505 lines
20 KiB
C++
505 lines
20 KiB
C++
/**
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* =============================================================================
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* DynamicHooks
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* Copyright (C) 2015 Robin Gohmert. All rights reserved.
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* Copyright (C) 2018-2021 AlliedModders LLC. All rights reserved.
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* =============================================================================
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*
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* This software is provided 'as-is', without any express or implied warranty.
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* In no event will the authors be held liable for any damages arising from
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* the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software in a
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* product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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*
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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*
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* 3. This notice may not be removed or altered from any source distribution.
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*
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* asm.h/cpp from devmaster.net (thanks cybermind) edited by pRED* to handle gcc
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* -fPIC thunks correctly
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*
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* Idea and trampoline code taken from DynDetours (thanks your-name-here).
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*
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* Adopted to provide similar features to SourceHook by AlliedModders LLC.
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*/
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// ============================================================================
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// >> INCLUDES
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// ============================================================================
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#include "hook.h"
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#include <asm/asm.h>
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#include <macro-assembler-x86.h>
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#include "extension.h"
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#include <jit/jit_helpers.h>
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#include <CDetour/detourhelpers.h>
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using namespace sp;
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// ============================================================================
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// >> DEFINITIONS
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// ============================================================================
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#define JMP_SIZE 6
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// ============================================================================
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// >> CHook
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// ============================================================================
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CHook::CHook(void* pFunc, ICallingConvention* pConvention)
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{
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m_pFunc = pFunc;
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m_pRegisters = new CRegisters(pConvention->GetRegisters());
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m_pCallingConvention = pConvention;
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if (!m_hookHandler.init())
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return;
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if (!m_RetAddr.init())
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return;
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unsigned char* pTarget = (unsigned char *) pFunc;
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// Determine the number of bytes we need to copy
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int iBytesToCopy = copy_bytes(pTarget, NULL, JMP_SIZE);
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// Create a buffer for the bytes to copy + a jump to the rest of the
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// function.
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unsigned char* pCopiedBytes = (unsigned char *) smutils->GetScriptingEngine()->AllocatePageMemory(iBytesToCopy + JMP_SIZE);
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// Fill the array with NOP instructions
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memset(pCopiedBytes, 0x90, iBytesToCopy + JMP_SIZE);
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// Copy the required bytes to our array
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copy_bytes(pTarget, pCopiedBytes, JMP_SIZE);
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// Write a jump after the copied bytes to the function/bridge + number of bytes to copy
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DoGatePatch(pCopiedBytes + iBytesToCopy, pTarget + iBytesToCopy);
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// Save the trampoline
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m_pTrampoline = (void *) pCopiedBytes;
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// Create the bridge function
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m_pBridge = CreateBridge();
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// Write a jump to the bridge
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DoGatePatch((unsigned char *) pFunc, m_pBridge);
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}
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CHook::~CHook()
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{
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// Copy back the previously copied bytes
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copy_bytes((unsigned char *) m_pTrampoline, (unsigned char *) m_pFunc, JMP_SIZE);
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// Free the trampoline buffer
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smutils->GetScriptingEngine()->FreePageMemory(m_pTrampoline);
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// Free the asm bridge and new return address
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smutils->GetScriptingEngine()->FreePageMemory(m_pBridge);
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smutils->GetScriptingEngine()->FreePageMemory(m_pNewRetAddr);
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delete m_pRegisters;
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delete m_pCallingConvention;
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}
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void CHook::AddCallback(HookType_t eHookType, HookHandlerFn* pCallback)
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{
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if (!pCallback)
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return;
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HookTypeMap::Insert i = m_hookHandler.findForAdd(eHookType);
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if (!i.found()) {
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HookHandlerSet set;
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set.init();
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m_hookHandler.add(i, eHookType, std::move(set));
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}
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i->value.add(pCallback);
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}
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void CHook::RemoveCallback(HookType_t eHookType, HookHandlerFn* pCallback)
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{
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HookTypeMap::Result r = m_hookHandler.find(eHookType);
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if (!r.found())
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return;
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r->value.removeIfExists(pCallback);
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}
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bool CHook::IsCallbackRegistered(HookType_t eHookType, HookHandlerFn* pCallback)
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{
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HookTypeMap::Result r = m_hookHandler.find(eHookType);
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if (!r.found())
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return false;
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return r->value.has(pCallback);
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}
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bool CHook::AreCallbacksRegistered()
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{
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HookTypeMap::Result r = m_hookHandler.find(HOOKTYPE_PRE);
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if (r.found() && r->value.elements() > 0)
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return true;
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r = m_hookHandler.find(HOOKTYPE_POST);
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if (r.found() && r->value.elements() > 0)
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return true;
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return false;
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}
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ReturnAction_t CHook::HookHandler(HookType_t eHookType)
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{
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if (eHookType == HOOKTYPE_POST)
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{
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ReturnAction_t lastPreReturnAction = m_LastPreReturnAction.back();
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m_LastPreReturnAction.pop_back();
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if (lastPreReturnAction >= ReturnAction_Override)
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m_pCallingConvention->RestoreReturnValue(m_pRegisters);
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if (lastPreReturnAction < ReturnAction_Supercede)
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m_pCallingConvention->RestoreCallArguments(m_pRegisters);
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}
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ReturnAction_t returnAction = ReturnAction_Ignored;
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HookTypeMap::Result r = m_hookHandler.find(eHookType);
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if (!r.found())
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{
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// Still save the arguments for the post hook even if there
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// is no pre-handler registered.
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if (eHookType == HOOKTYPE_PRE)
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{
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m_LastPreReturnAction.push_back(returnAction);
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m_pCallingConvention->SaveCallArguments(m_pRegisters);
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}
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return returnAction;
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}
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HookHandlerSet &callbacks = r->value;
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for(HookHandlerSet::iterator it=callbacks.iter(); !it.empty(); it.next())
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{
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ReturnAction_t result = ((HookHandlerFn) *it)(eHookType, this);
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if (result > returnAction)
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returnAction = result;
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}
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if (eHookType == HOOKTYPE_PRE)
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{
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m_LastPreReturnAction.push_back(returnAction);
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if (returnAction >= ReturnAction_Override)
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m_pCallingConvention->SaveReturnValue(m_pRegisters);
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if (returnAction < ReturnAction_Supercede)
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m_pCallingConvention->SaveCallArguments(m_pRegisters);
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}
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return returnAction;
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}
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void* __cdecl CHook::GetReturnAddress(void* pESP)
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{
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ReturnAddressMap::Result r = m_RetAddr.find(pESP);
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assert(r.found());
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if (!r.found())
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{
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smutils->LogError(myself, "FATAL: Failed to find return address of original function. Check the arguments and return type of your detour setup.");
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return NULL;
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}
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void *pRetAddr = r->value.back();
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r->value.pop_back();
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// Clear the stack address from the cache now that we ran the last post hook.
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if (r->value.empty())
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m_RetAddr.remove(r);
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return pRetAddr;
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}
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void __cdecl CHook::SetReturnAddress(void* pRetAddr, void* pESP)
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{
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ReturnAddressMap::Insert i = m_RetAddr.findForAdd(pESP);
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if (!i.found())
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m_RetAddr.add(i, pESP, std::vector<void *>());
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i->value.push_back(pRetAddr);
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}
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void* CHook::CreateBridge()
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{
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sp::MacroAssembler masm;
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Label label_supercede;
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// Write a redirect to the post-hook code
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Write_ModifyReturnAddress(masm);
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// Call the pre-hook handler and jump to label_supercede if ReturnAction_Supercede was returned
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Write_CallHandler(masm, HOOKTYPE_PRE);
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masm.cmpb(r8_al, ReturnAction_Supercede);
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// Restore the previously saved registers, so any changes will be applied
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Write_RestoreRegisters(masm, HOOKTYPE_PRE);
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masm.j(equal, &label_supercede);
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// Jump to the trampoline
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masm.jmp(ExternalAddress(m_pTrampoline));
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// This code will be executed if a pre-hook returns ReturnAction_Supercede
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masm.bind(&label_supercede);
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// Finally, return to the caller
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// This will still call post hooks, but will skip the original function.
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masm.ret(m_pCallingConvention->GetPopSize());
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void *base = smutils->GetScriptingEngine()->AllocatePageMemory(masm.length());
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masm.emitToExecutableMemory(base);
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return base;
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}
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void CHook::Write_ModifyReturnAddress(sp::MacroAssembler& masm)
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{
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// Save scratch registers that are used by SetReturnAddress
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static void* pEAX = NULL;
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static void* pECX = NULL;
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static void* pEDX = NULL;
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masm.movl(Operand(ExternalAddress(&pEAX)), eax);
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masm.movl(Operand(ExternalAddress(&pECX)), ecx);
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masm.movl(Operand(ExternalAddress(&pEDX)), edx);
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// Store the return address in eax
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masm.movl(eax, Operand(esp, 0));
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// Save the original return address by using the current esp as the key.
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// This should be unique until we have returned to the original caller.
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void (__cdecl CHook::*SetReturnAddress)(void*, void*) = &CHook::SetReturnAddress;
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masm.push(esp);
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masm.push(eax);
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masm.push(intptr_t(this));
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masm.call(ExternalAddress((void *&)SetReturnAddress));
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masm.addl(esp, 12);
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// Restore scratch registers
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masm.movl(eax, Operand(ExternalAddress(&pEAX)));
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masm.movl(ecx, Operand(ExternalAddress(&pECX)));
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masm.movl(edx, Operand(ExternalAddress(&pEDX)));
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// Override the return address. This is a redirect to our post-hook code
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m_pNewRetAddr = CreatePostCallback();
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masm.movl(Operand(esp, 0), intptr_t(m_pNewRetAddr));
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}
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void* CHook::CreatePostCallback()
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{
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sp::MacroAssembler masm;
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int iPopSize = m_pCallingConvention->GetPopSize();
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// Subtract the previously added bytes (stack size + return address), so
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// that we can access the arguments again
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masm.subl(esp, iPopSize+4);
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// Call the post-hook handler
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Write_CallHandler(masm, HOOKTYPE_POST);
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// Restore the previously saved registers, so any changes will be applied
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Write_RestoreRegisters(masm, HOOKTYPE_POST);
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// Save scratch registers that are used by GetReturnAddress
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static void* pEAX = NULL;
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static void* pECX = NULL;
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static void* pEDX = NULL;
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masm.movl(Operand(ExternalAddress(&pEAX)), eax);
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masm.movl(Operand(ExternalAddress(&pECX)), ecx);
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masm.movl(Operand(ExternalAddress(&pEDX)), edx);
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// Get the original return address
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void* (__cdecl CHook::*GetReturnAddress)(void*) = &CHook::GetReturnAddress;
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masm.push(esp);
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masm.push(intptr_t(this));
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masm.call(ExternalAddress((void *&)GetReturnAddress));
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masm.addl(esp, 8);
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// Save the original return address
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static void* pRetAddr = NULL;
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masm.movl(Operand(ExternalAddress(&pRetAddr)), eax);
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// Restore scratch registers
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masm.movl(eax, Operand(ExternalAddress(&pEAX)));
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masm.movl(ecx, Operand(ExternalAddress(&pECX)));
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masm.movl(edx, Operand(ExternalAddress(&pEDX)));
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// Add the bytes again to the stack (stack size + return address), so we
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// don't corrupt the stack.
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masm.addl(esp, iPopSize+4);
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// Jump to the original return address
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masm.jmp(Operand(ExternalAddress(&pRetAddr)));
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// Generate the code
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void *base = smutils->GetScriptingEngine()->AllocatePageMemory(masm.length());
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masm.emitToExecutableMemory(base);
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return base;
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}
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void CHook::Write_CallHandler(sp::MacroAssembler& masm, HookType_t type)
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{
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ReturnAction_t (__cdecl CHook::*HookHandler)(HookType_t) = &CHook::HookHandler;
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// Save the registers so that we can access them in our handlers
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Write_SaveRegisters(masm, type);
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// Align the stack to 16 bytes.
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masm.subl(esp, 4);
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// Call the global hook handler
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masm.push(type);
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masm.push(intptr_t(this));
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masm.call(ExternalAddress((void *&)HookHandler));
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masm.addl(esp, 12);
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}
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void CHook::Write_SaveRegisters(sp::MacroAssembler& masm, HookType_t type)
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{
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std::vector<Register_t> vecRegistersToSave = m_pCallingConvention->GetRegisters();
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for(size_t i = 0; i < vecRegistersToSave.size(); i++)
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{
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switch(vecRegistersToSave[i])
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{
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// ========================================================================
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// >> 8-bit General purpose registers
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// ========================================================================
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case AL: masm.movl(Operand(ExternalAddress(m_pRegisters->m_al->m_pAddress)), r8_al); break;
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case CL: masm.movl(Operand(ExternalAddress(m_pRegisters->m_cl->m_pAddress)), r8_cl); break;
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case DL: masm.movl(Operand(ExternalAddress(m_pRegisters->m_dl->m_pAddress)), r8_dl); break;
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case BL: masm.movl(Operand(ExternalAddress(m_pRegisters->m_bl->m_pAddress)), r8_bl); break;
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case AH: masm.movl(Operand(ExternalAddress(m_pRegisters->m_ah->m_pAddress)), r8_ah); break;
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case CH: masm.movl(Operand(ExternalAddress(m_pRegisters->m_ch->m_pAddress)), r8_ch); break;
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case DH: masm.movl(Operand(ExternalAddress(m_pRegisters->m_dh->m_pAddress)), r8_dh); break;
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case BH: masm.movl(Operand(ExternalAddress(m_pRegisters->m_bh->m_pAddress)), r8_bh); break;
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// ========================================================================
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// >> 32-bit General purpose registers
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// ========================================================================
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case EAX: masm.movl(Operand(ExternalAddress(m_pRegisters->m_eax->m_pAddress)), eax); break;
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case ECX: masm.movl(Operand(ExternalAddress(m_pRegisters->m_ecx->m_pAddress)), ecx); break;
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case EDX: masm.movl(Operand(ExternalAddress(m_pRegisters->m_edx->m_pAddress)), edx); break;
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case EBX: masm.movl(Operand(ExternalAddress(m_pRegisters->m_ebx->m_pAddress)), ebx); break;
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case ESP: masm.movl(Operand(ExternalAddress(m_pRegisters->m_esp->m_pAddress)), esp); break;
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case EBP: masm.movl(Operand(ExternalAddress(m_pRegisters->m_ebp->m_pAddress)), ebp); break;
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case ESI: masm.movl(Operand(ExternalAddress(m_pRegisters->m_esi->m_pAddress)), esi); break;
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case EDI: masm.movl(Operand(ExternalAddress(m_pRegisters->m_edi->m_pAddress)), edi); break;
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// ========================================================================
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// >> 128-bit XMM registers
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// ========================================================================
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// TODO: Also provide movups?
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case XMM0: masm.movaps(Operand(ExternalAddress(m_pRegisters->m_xmm0->m_pAddress)), xmm0); break;
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case XMM1: masm.movaps(Operand(ExternalAddress(m_pRegisters->m_xmm1->m_pAddress)), xmm1); break;
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case XMM2: masm.movaps(Operand(ExternalAddress(m_pRegisters->m_xmm2->m_pAddress)), xmm2); break;
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case XMM3: masm.movaps(Operand(ExternalAddress(m_pRegisters->m_xmm3->m_pAddress)), xmm3); break;
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case XMM4: masm.movaps(Operand(ExternalAddress(m_pRegisters->m_xmm4->m_pAddress)), xmm4); break;
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case XMM5: masm.movaps(Operand(ExternalAddress(m_pRegisters->m_xmm5->m_pAddress)), xmm5); break;
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case XMM6: masm.movaps(Operand(ExternalAddress(m_pRegisters->m_xmm6->m_pAddress)), xmm6); break;
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case XMM7: masm.movaps(Operand(ExternalAddress(m_pRegisters->m_xmm7->m_pAddress)), xmm7); break;
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// ========================================================================
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// >> 80-bit FPU registers
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// ========================================================================
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case ST0:
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// Don't mess with the FPU stack in a pre-hook. The float return is returned in st0,
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// so only load it in a post hook to avoid writing back NaN.
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if (type == HOOKTYPE_POST)
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masm.fst32(Operand(ExternalAddress(m_pRegisters->m_st0->m_pAddress)));
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break;
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//case ST1: masm.movl(tword_ptr_abs(Ptr(m_pRegisters->m_st1->m_pAddress)), st1); break;
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//case ST2: masm.movl(tword_ptr_abs(Ptr(m_pRegisters->m_st2->m_pAddress)), st2); break;
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//case ST3: masm.movl(tword_ptr_abs(Ptr(m_pRegisters->m_st3->m_pAddress)), st3); break;
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//case ST4: masm.movl(tword_ptr_abs(Ptr(m_pRegisters->m_st4->m_pAddress)), st4); break;
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//case ST5: masm.movl(tword_ptr_abs(Ptr(m_pRegisters->m_st5->m_pAddress)), st5); break;
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//case ST6: masm.movl(tword_ptr_abs(Ptr(m_pRegisters->m_st6->m_pAddress)), st6); break;
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//case ST7: masm.movl(tword_ptr_abs(Ptr(m_pRegisters->m_st7->m_pAddress)), st7); break;
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default: puts("Unsupported register.");
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}
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}
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}
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void CHook::Write_RestoreRegisters(sp::MacroAssembler& masm, HookType_t type)
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{
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std::vector<Register_t> vecRegistersToSave = m_pCallingConvention->GetRegisters();
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for (size_t i = 0; i < vecRegistersToSave.size(); i++)
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{
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switch (vecRegistersToSave[i])
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{
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// ========================================================================
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// >> 8-bit General purpose registers
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// ========================================================================
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case AL: masm.movl(r8_al, Operand(ExternalAddress(m_pRegisters->m_al->m_pAddress))); break;
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case CL: masm.movl(r8_cl, Operand(ExternalAddress(m_pRegisters->m_cl->m_pAddress))); break;
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case DL: masm.movl(r8_dl, Operand(ExternalAddress(m_pRegisters->m_dl->m_pAddress))); break;
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case BL: masm.movl(r8_bl, Operand(ExternalAddress(m_pRegisters->m_bl->m_pAddress))); break;
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case AH: masm.movl(r8_ah, Operand(ExternalAddress(m_pRegisters->m_ah->m_pAddress))); break;
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case CH: masm.movl(r8_ch, Operand(ExternalAddress(m_pRegisters->m_ch->m_pAddress))); break;
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case DH: masm.movl(r8_dh, Operand(ExternalAddress(m_pRegisters->m_dh->m_pAddress))); break;
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case BH: masm.movl(r8_bh, Operand(ExternalAddress(m_pRegisters->m_bh->m_pAddress))); break;
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// ========================================================================
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// >> 32-bit General purpose registers
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// ========================================================================
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case EAX: masm.movl(eax, Operand(ExternalAddress(m_pRegisters->m_eax->m_pAddress))); break;
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case ECX: masm.movl(ecx, Operand(ExternalAddress(m_pRegisters->m_ecx->m_pAddress))); break;
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case EDX: masm.movl(edx, Operand(ExternalAddress(m_pRegisters->m_edx->m_pAddress))); break;
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case EBX: masm.movl(ebx, Operand(ExternalAddress(m_pRegisters->m_ebx->m_pAddress))); break;
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case ESP: masm.movl(esp, Operand(ExternalAddress(m_pRegisters->m_esp->m_pAddress))); break;
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case EBP: masm.movl(ebp, Operand(ExternalAddress(m_pRegisters->m_ebp->m_pAddress))); break;
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case ESI: masm.movl(esi, Operand(ExternalAddress(m_pRegisters->m_esi->m_pAddress))); break;
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case EDI: masm.movl(edi, Operand(ExternalAddress(m_pRegisters->m_edi->m_pAddress))); break;
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|
|
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// ========================================================================
|
|
// >> 128-bit XMM registers
|
|
// ========================================================================
|
|
// TODO: Also provide movups?
|
|
case XMM0: masm.movaps(xmm0, Operand(ExternalAddress(m_pRegisters->m_xmm0->m_pAddress))); break;
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case XMM1: masm.movaps(xmm1, Operand(ExternalAddress(m_pRegisters->m_xmm1->m_pAddress))); break;
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case XMM2: masm.movaps(xmm2, Operand(ExternalAddress(m_pRegisters->m_xmm2->m_pAddress))); break;
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case XMM3: masm.movaps(xmm3, Operand(ExternalAddress(m_pRegisters->m_xmm3->m_pAddress))); break;
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case XMM4: masm.movaps(xmm4, Operand(ExternalAddress(m_pRegisters->m_xmm4->m_pAddress))); break;
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case XMM5: masm.movaps(xmm5, Operand(ExternalAddress(m_pRegisters->m_xmm5->m_pAddress))); break;
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case XMM6: masm.movaps(xmm6, Operand(ExternalAddress(m_pRegisters->m_xmm6->m_pAddress))); break;
|
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case XMM7: masm.movaps(xmm7, Operand(ExternalAddress(m_pRegisters->m_xmm7->m_pAddress))); break;
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|
|
|
|
|
// ========================================================================
|
|
// >> 80-bit FPU registers
|
|
// ========================================================================
|
|
case ST0:
|
|
if (type == HOOKTYPE_POST) {
|
|
// Replace the top of the FPU stack.
|
|
// Copy st0 to st0 and pop -> just pop the FPU stack.
|
|
masm.fstp(st0);
|
|
// Push a value to the FPU stack.
|
|
// TODO: Only write back when changed? Save full 80bits for that case.
|
|
// Avoid truncation of the data if it's unchanged.
|
|
masm.fld32(Operand(ExternalAddress(m_pRegisters->m_st0->m_pAddress)));
|
|
}
|
|
break;
|
|
//case ST1: masm.movl(st1, tword_ptr_abs(Ptr(m_pRegisters->m_st1->m_pAddress))); break;
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//case ST2: masm.movl(st2, tword_ptr_abs(Ptr(m_pRegisters->m_st2->m_pAddress))); break;
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//case ST3: masm.movl(st3, tword_ptr_abs(Ptr(m_pRegisters->m_st3->m_pAddress))); break;
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//case ST4: masm.movl(st4, tword_ptr_abs(Ptr(m_pRegisters->m_st4->m_pAddress))); break;
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|
//case ST5: masm.movl(st5, tword_ptr_abs(Ptr(m_pRegisters->m_st5->m_pAddress))); break;
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|
//case ST6: masm.movl(st6, tword_ptr_abs(Ptr(m_pRegisters->m_st6->m_pAddress))); break;
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|
//case ST7: masm.movl(st7, tword_ptr_abs(Ptr(m_pRegisters->m_st7->m_pAddress))); break;
|
|
|
|
default: puts("Unsupported register.");
|
|
}
|
|
}
|
|
}
|