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Simplify reading the existing instruction when patching a function

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Maschell 2023-01-04 22:52:29 +01:00
parent e85d383ec4
commit 8d853d6320
1 changed files with 3 additions and 17 deletions
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20
source/function_patcher.cpp
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@ -47,26 +47,12 @@ bool PatchFunction(std::shared_ptr<PatchedFunctionData> &patchedFunction) {
DEBUG_FUNCTION_LINE("Patching function @ %08X", patchedFunction->realEffectiveFunctionAddress);
}
volatile uint32_t replacedInstruction;
auto targetAddress = (uint32_t) &replacedInstruction;
if (targetAddress < 0x00800000 || targetAddress >= 0x01000000) {
targetAddress = (uint32_t) OSEffectiveToPhysical(targetAddress);
} else {
targetAddress = targetAddress + 0x30800000 - 0x00800000;
}
if (targetAddress == 0) {
DEBUG_FUNCTION_LINE_ERR("Failed to get physical address");
OSFatal("Failed to get physical address");
if (!ReadFromPhysicalAddress(patchedFunction->realPhysicalFunctionAddress, &patchedFunction->replacedInstruction)) {
DEBUG_FUNCTION_LINE_ERR("Failed to read instruction.");
OSFatal("Failed to read instruction.");
return false;
}
// Save the instruction we will replace.
KernelCopyData(targetAddress, patchedFunction->realPhysicalFunctionAddress, 4);
DCFlushRange((void *) &replacedInstruction, 4);
patchedFunction->replacedInstruction = replacedInstruction;
// Generate a jump to the original function so the unpatched function can still be called
patchedFunction->generateJumpToOriginal();