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Foundations of Linux ARM64: Debug, Disassemble, and Reverse

Disassembly Output Without Optimization

Explore how to reconstruct approximate C/C++ programs from unoptimized disassembly outputs using GDB on Linux ARM64. Understand pointer manipulation, basic arithmetic operations, and debug step-by-step to analyze memory and registers during program execution.

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Example of a disassembly output: No-optimization mode

The ability to reconstruct approximate C or C++ code from code disassembly is essential in memory dump analysis and debugging.

Source code

We give a C/C++ code for our project of reconstructing a program through the GDB disassembly output in this lesson:

C++
int a, b;
int *pa, *pb;
int main(int argc, char* argv[])
{
	pa = &a;
	pb = &b;
	*pa = 1;
	*pb = 1;
	*pb = *pb + *pa;
	++*pa;
	*pb = *pb * *pa;
	return 0;
}

Here is a breakdown of the code presented above:

Explanation

  • Line 1: We declare the two integer variables.
  • Line 2: We declare the two integer pointers.
  • Lines
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