184 lines
9.3 KiB
C++
184 lines
9.3 KiB
C++
#include "PatchedFunctionData.h"
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#include "utils/utils.h"
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std::optional<std::shared_ptr<PatchedFunctionData>> PatchedFunctionData::make_shared(std::shared_ptr<FunctionAddressProvider> functionAddressProvider,
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function_replacement_data_t *replacementData,
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MEMHeapHandle heapHandle) {
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if (!replacementData) {
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return {};
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}
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auto ptr = make_shared_nothrow<PatchedFunctionData>(std::move(functionAddressProvider));
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if (!ptr) {
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return {};
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}
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ptr->isPatched = false;
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ptr->heapHandle = heapHandle;
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ptr->library = replacementData->library;
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ptr->targetProcess = replacementData->targetProcess;
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ptr->replacementFunctionAddress = replacementData->replaceAddr;
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ptr->realCallFunctionAddressPtr = replacementData->replaceCall;
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if (replacementData->library != LIBRARY_OTHER) {
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ptr->functionName = replacementData->function_name;
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} else {
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ptr->realEffectiveFunctionAddress = replacementData->virtualAddr;
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ptr->realPhysicalFunctionAddress = replacementData->physicalAddr;
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}
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ptr->jumpToOriginal = (uint32_t *) MEMAllocFromExpHeapEx(ptr->heapHandle, 0x5 * sizeof(uint32_t), 4);
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if (ptr->replacementFunctionAddress > 0x01FFFFFC || ptr->targetProcess != FP_TARGET_PROCESS_ALL) {
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ptr->jumpDataSize = 15; // We could predict the actual size and save some memory, but at the moment we don't need it.
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ptr->jumpData = (uint32_t *) MEMAllocFromExpHeapEx(ptr->heapHandle, ptr->jumpDataSize * sizeof(uint32_t), 4);
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if (!ptr->jumpData) {
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DEBUG_FUNCTION_LINE_ERR("Failed to alloc jump data");
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return {};
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}
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}
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if (!ptr->jumpToOriginal) {
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DEBUG_FUNCTION_LINE_ERR("Failed to alloc jump data");
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return {};
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}
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return ptr;
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}
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bool PatchedFunctionData::updateFunctionAddresses() {
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if (this->library == LIBRARY_OTHER) {
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return true;
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}
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if (!this->functionName) {
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DEBUG_FUNCTION_LINE_ERR("Function name was empty. This should never happen.");
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OSFatal("FunctionPatcherModule: function name was empty");
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return false;
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}
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auto real_address = functionAddressProvider->getEffectiveAddressOfFunction(library, this->functionName->c_str());
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if (!real_address) {
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DEBUG_FUNCTION_LINE("OSDynLoad_FindExport failed for %s, updating address not possible.", this->functionName->c_str());
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return false;
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}
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this->realEffectiveFunctionAddress = real_address;
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auto physicalFunctionAddress = (uint32_t) OSEffectiveToPhysical(real_address);
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if (!physicalFunctionAddress) {
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DEBUG_FUNCTION_LINE_ERR("Error. Something is wrong with the physical address");
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return false;
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}
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this->realPhysicalFunctionAddress = physicalFunctionAddress;
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return true;
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}
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void PatchedFunctionData::generateJumpToOriginal() {
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if (!this->jumpToOriginal) {
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DEBUG_FUNCTION_LINE_ERR("this->jumpToOriginal is not allocated");
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OSFatal("FunctionPatcherModule: this->jumpToOriginal is not allocated");
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}
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uint32_t jumpToAddress = this->realEffectiveFunctionAddress + 4;
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this->jumpToOriginal[0] = this->replacedInstruction;
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if (((uint32_t) jumpToAddress & 0x01FFFFFC) != (uint32_t) jumpToAddress) {
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// We need to do a long jump
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this->jumpToOriginal[1] = 0x3d600000 | ((jumpToAddress >> 16) & 0x0000FFFF); // lis r11 ,0x1234
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this->jumpToOriginal[2] = 0x616b0000 | (jumpToAddress & 0x0000ffff); // ori r11 ,r11 ,0x5678
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this->jumpToOriginal[3] = 0x7d6903a6; // mtspr CTR ,r11
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this->jumpToOriginal[4] = 0x4e800420; // bctr
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} else {
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this->jumpToOriginal[1] = 0x48000002 | (jumpToAddress & 0x01FFFFFC);
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}
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DCFlushRange((void *) this->jumpToOriginal, sizeof(uint32_t) * 5);
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ICInvalidateRange((void *) this->jumpToOriginal, sizeof(uint32_t) * 5);
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*(this->realCallFunctionAddressPtr) = (uint32_t) this->jumpToOriginal;
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OSMemoryBarrier();
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}
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void PatchedFunctionData::generateReplacementJump() {
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//setting jump back
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this->replaceWithInstruction = 0x48000002 | (this->replacementFunctionAddress & 0x01FFFFFC);
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// If the jump is too big, or we want only patch for certain processes we need a trampoline
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if (this->replacementFunctionAddress > 0x01FFFFFC || this->targetProcess != FP_TARGET_PROCESS_ALL) {
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if (!this->jumpData) {
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DEBUG_FUNCTION_LINE_ERR("jumpData was not allocated");
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OSFatal("FunctionPatcherModule: jumpData was not allocated");
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}
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uint32_t offset = 0;
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if (this->targetProcess != FP_TARGET_PROCESS_ALL) {
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auto originalFunctionAddrWithOffset = this->realEffectiveFunctionAddress + 4;
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bool shortBranchToOriginalPossible = ((uint32_t) originalFunctionAddrWithOffset & 0x01FFFFFC) == (uint32_t) originalFunctionAddrWithOffset;
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// Only use patched function if OSGetUPID matches function_data->targetProcess
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this->jumpData[offset++] = 0x3d600000 | (((uint32_t *) OSGetUPID)[0] & 0x0000FFFF); // lis r11 ,0x0
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this->jumpData[offset++] = 0x816b0000 | (((uint32_t *) OSGetUPID)[1] & 0x0000FFFF); // lwz r11 ,0x0(r11)
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if (this->targetProcess == FP_TARGET_PROCESS_GAME_AND_MENU) {
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this->jumpData[offset++] = 0x2c0b0000 | FP_TARGET_PROCESS_WII_U_MENU; // cmpwi r11 ,FP_TARGET_PROCESS_WII_U_MENU
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this->jumpData[offset++] = 0x41820000 | (shortBranchToOriginalPossible ? 0x00000014 : 0x00000020); // beq myfunc
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this->jumpData[offset++] = 0x2c0b0000 | FP_TARGET_PROCESS_GAME; // cmpwi r11 ,FP_TARGET_PROCESS_GAME
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this->jumpData[offset++] = 0x41820000 | (shortBranchToOriginalPossible ? 0x0000000C : 0x00000018); // beq myfunc
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} else {
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this->jumpData[offset++] = 0x2c0b0000 | this->targetProcess; // cmpwi r11 ,function_data->targetProcess
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this->jumpData[offset++] = 0x41820000 | (shortBranchToOriginalPossible ? 0x0000000C : 0x00000018); // beq myfunc
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}
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this->jumpData[offset++] = this->replacedInstruction;
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if (((uint32_t) originalFunctionAddrWithOffset & 0x01FFFFFC) != (uint32_t) originalFunctionAddrWithOffset) {
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this->jumpData[offset++] = 0x3d600000 | (((this->realEffectiveFunctionAddress + 4) >> 16) & 0x0000FFFF); // lis r11 ,(real_addr + 4)@hi
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this->jumpData[offset++] = 0x616b0000 | ((this->realEffectiveFunctionAddress + 4) & 0x0000ffff); // ori r11 ,(real_addr + 4)@lo
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this->jumpData[offset++] = 0x7d6903a6; // mtspr CTR ,r11
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this->jumpData[offset++] = 0x4e800420; // bctr
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} else {
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this->jumpData[offset++] = 0x48000002 | (originalFunctionAddrWithOffset & 0x01FFFFFC);
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}
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}
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// myfunc:
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if (((uint32_t) this->replacementFunctionAddress & 0x01FFFFFC) != (uint32_t) this->replacementFunctionAddress) {
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this->jumpData[offset++] = 0x3d600000 | (((this->replacementFunctionAddress) >> 16) & 0x0000FFFF); // lis r11 ,repl_addr@hi
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this->jumpData[offset++] = 0x616b0000 | ((this->replacementFunctionAddress) & 0x0000ffff); // ori r11 ,r11 ,repl_addr@lo
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this->jumpData[offset++] = 0x7d6903a6; // mtspr CTR ,r11
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this->jumpData[offset] = 0x4e800420; // bctr
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} else {
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this->jumpData[offset] = 0x48000002 | (replacementFunctionAddress & 0x01FFFFFC);
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}
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if (offset >= this->jumpDataSize) {
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DEBUG_FUNCTION_LINE_ERR("Tried to overflow buffer. offset: %08X vs array size: %08X", offset, this->jumpDataSize);
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OSFatal("FunctionPatcherModule: Wrote too much data");
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}
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// Make sure the trampoline itself is usable.
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if (((uint32_t) this->jumpData & 0x01FFFFFC) != (uint32_t) this->jumpData) {
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DEBUG_FUNCTION_LINE_ERR("Jump is impossible");
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OSFatal("FunctionPatcherModule: Jump is impossible");
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}
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this->replaceWithInstruction = 0x48000002 | ((uint32_t) this->jumpData & 0x01FFFFFC);
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DCFlushRange((void *) this->jumpData, sizeof(uint32_t) * 15);
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ICInvalidateRange((void *) this->jumpData, sizeof(uint32_t) * 15);
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}
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DCFlushRange((void *) &replaceWithInstruction, 4);
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ICInvalidateRange((void *) &replaceWithInstruction, 4);
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OSMemoryBarrier();
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}
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PatchedFunctionData::~PatchedFunctionData() {
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if (this->jumpToOriginal) {
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MEMFreeToExpHeap(this->heapHandle, this->jumpToOriginal);
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this->jumpToOriginal = nullptr;
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}
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if (this->jumpData) {
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MEMFreeToExpHeap(this->heapHandle, this->jumpData);
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this->jumpData = nullptr;
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}
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}
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