Understanding ARM assembly – a primer

Wait... assembly? What? Wasn't C low-level enough?

Well, in short... No. In our case, Ghidra decompiles to C but Ghidra cannot (some things are in development but at the time of writing are not mature enough to be regularly used) directly act as a debugger frontend.

Additionally, it is very important for you to understand one or two assembly languages in order to understand how an MCU/CPU actually executes code. Once you have integrated one assembly language, all the others will be very, very similar in structure.

Between the assembly code for two different architectures, the mnemonics can be different (mnemonic is the name for a binary instruction that the CPU understands), but the way they interact will largely follow the same principles.

Also, the base operations are largely the same! After all, a CPU is nothing more than a very fast calculator. You can expect all of them to be able to do integer additions, subtractions...