@Override
	public void executeInstruction() {
		instruction = decoder.decodeInstruction(counter, context);
		PcodeProgram insProg = PcodeProgram.fromInstruction(instruction);
		preExecuteInstruction();
		try {
			frame = executor.execute(insProg, getUseropLibrary());
		}
		catch (PcodeExecutionException e) {
			frame = e.getFrame();
			throw e;
		}
		advanceAfterFinished();
	}
Extension point: Behavior when a p-code userop definition is not found

@param op the op
@param opName the name of the p-code userop
@return true if handle, false if still undefined
Ghidra/Framework/Emulation/src/main/java/ghidra/pcode/emu/DefaultPcodeThread.java