Foundations of ARM64 Linux Debugging, Disassembling, and Reversing: Analyze Code, Understand Stack Memory Usage, and Reconstruct Original C/C++ Code with ARM64

© The Author(s), under exclusive license to APress Media, LLC, part of Springer Nature 2023

D. VostokovFoundations of ARM64 Linux Debugging, Disassembling, and Reversinghttps://doi.org/10.1007/978-1-4842-9082-8_2

2. Code Optimization

Dmitry Vostokov¹  

(1)

Dublin, Ireland

 

“Arithmetic” Project: C/C++ Program

Let’s rewrite our “Arithmetic” program in C/C++. Corresponding assembly language instructions are put in comments:

int a, b;

int main(int argc, char* argv[])

{

      a = 1;              // adr  x0, a

                          // mov  w1, #1

                          // str  w1, [x0]

      b = 1;              // adr  x0, b

                          // mov  w1, #1

                          // str  w1, [x0]

      b = b + a;          // adr  x0, b

                          // ...