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Debugging, Disassembly & Reversing in Linux for x64 Architecture

Disassembly Output Without Optimization

Learn how GDB disassembly output is used for memory dump analysis and debugging.

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Example of disassembly output: no optimization mode

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

Source code

Below is a C/C++ code that will help us reconstruct a program through GDB disassembly output.

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;
}

Explanation

  • Line 1: Declares the two integer variables.
  • Line 2: Declares the two integer pointers.
  • Line 6–7: Initializes an integer pointer with the address of an integer variable.
  • Line 9–10:
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