In the previous installment we talked about the parsing technology we used, which looks like the canonical academic approach to parsing. In this chapter we will see some dificulties we encountered along the years.
So far we know how to do some computations and access memory. Today we will learn how to alter the control flow of our program.
In this chapter we will see how we can access the memory in AArch64.
In this chapter we will talk about a fascinating step that is required to create a program, even when using assembler. Today we will talk about linking.
In this chapter we will see some instructions that will allow us to compute things.
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.