how i kill a arm assembly program? (or make a crash)

Question

i'm reverse engineering this android app to add some functionalities, like a exit button. i'm using arm assembly. how i do that? i've tried branch to the end address and create a intentional crash too, but the app just restarts and not closes. I read on the internet that there is no way to do a "return 0" as it is done in C. I also read something on the internet about crashing using something called BusFault. from what I understand it is a register that is set when there is an attempt to illegally access illegal memory addresses (I think it's 0xffffffff). but how do i do that? and doing this will my application actually terminate?