In the last chapter we saw that instructions may have register operands and immediate operands. We also mentioned that mixing 32-bit and 64-bit register was not allowed. Today we will talk a bit more about register operands.

In the first installment of this series we did a very first simple program. In this chapter we will continue learning a bit more about AArch64.

In the previous installment I gave some context about the existence of Mercurium as a tool. In this chapter we will start digging into the parsing technology used.

As part of the work I did in my previous employer, we had to develop a C++ front end. This is never an easy task so I will use this series to share some experiences while developing it.

AArch64 is a new 64 bit mode that is part of the ARMv8 architecture presented in 2011 by ARM. It has been progressively been deployed in smartphones and servers. So I think it is a good moment to learn a bit more about the assembler of this architecture.