@Override
	public ListingField getField(ProxyObj<?> proxy, int varWidth) {

		Object obj = proxy.getObject();
		if (!enabled || !(obj instanceof Function)) {
			return null;
		}
		int x = startX + varWidth;

		Function function = (Function) obj;
		List<Register> setRegisters = getSetRegisters(function);
		if (setRegisters.isEmpty()) {
			return null;
		}
		String[] registerStrings = getRegisterStrings(function, setRegisters);
		return getTextField(registerStrings, proxy, x);
	}
Field to show register values at the function entry point.
Ghidra/Features/Base/src/main/java/ghidra/app/util/viewer/field/RegisterFieldFactory.java