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Debugging, Disassembly & Reversing in Linux for x64 Architecture

Implementation of Project

Explore how to implement and debug a project using function pointer parameters in C++. Learn to compile, set breakpoints, disassemble functions, and inspect register contents with GDB. This lesson guides you step-by-step through examining assembly code and practicing commands to improve debugging skills in Linux x64 environment.

We'll cover the following...

Function pointer parameters project

It is our final project and a summary of the project source code.

FunctionParameters

The source code of the FunctionParameters project is given below:

C++
// FunctionParameters.cpp
int main(int argc, char* argv[])
{
       int a, b;
       printf("Enter a and b: ");
       scanf("%d %d", &a, &b);
       if (arithmetic (a, &b))
       {
             printf("Result = %d", b);
       }
       return 0; 
}

Arithmetic program

The source code of the arithmetic program is given below:

C++
// Arithmetic.cpp
bool arithmetic (int a, int *b) 
{
       if (!b)
       {
        return false;
       }
       *b = *b + a;
       ++a;
       *b = *b * a;
       return true;
}

Commented disassembly

Here is the commented disassembly we get after compiling the project and loading it into GDB:

gcc FunctionParameters.cpp Arithmetic.cpp -o FunctionParameters
gdb ./FunctionParameters

After compiling and loading, we should see the following in the GDB container:

...