Foundations of Linux Debugging, Disassembling, and Reversing: Analyze Binary Code, Understand Stack Memory Usage, and Reconstruct C/C++ Code with Intel x64

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

D. VostokovFoundations of Linux Debugging, Disassembling, and Reversinghttps://doi.org/10.1007/978-1-4842-9153-5_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;               // movl $1, a

      b = 1;               // movl $1, b

      b = b + a;           // mov  a, %eax

                           // mov  b, %edx

                           // add  %edx, %eax

                           // mov  %eax, b

      ++a;                 // mov  a, %eax

                           // ...