• Understanding the basics of assembly code

• Go over C++ code
• Debugging basics
  • clang++ -g main.cpp -o main
  • si - step into instruction
  • p $edi - print value in edi
  • x/2d $rbp-0x8 - examine 2 ints in rbp
• Reading assembly
  • 0x100000f60 <+0>...
  • movl %edi, -0x8(%rbp)
  • addl -0x8(%rbp), %eax
  • callq 0x100000ed0

# Create debuggable executable
clang++ -g main.cpp -o main

# Run lldb
lldb ./main

b main # Breakpoint
n # Next
ni # Next instruction
s # Step into
si # Step into instruction

p $edi # print value in edi
x/2d $rbp-0x8 # examine 2 ints in rbp

• How to Read x86 Assembly?

• How to Read x86 Assembly like English?

• C++ Deep Dive: How to Read x86 Assembly Code

• How to Read x86 Assembly Code | C++ Deep Dive for Beginners

• C++ Assembly Deep Dive: How to Read x86 Assembly Code?

• How to Read Assembly Code | C++ Tutorial for Beginners

• x86 Assembly Language Tutorial for C++ Programmers

• How to Read Assembly Code Like English | C++ Tutorial

• How to Read C++ Assembly Code for Beginners

• Intro to Assembly Code | C++ LLDB Tutorial

• C++ Reverse Engineering: Understanding Clang Assembly in LLDB

In this C++ tutorial, we go over how to read assembly code generated by Clang. We start by understanding the sample C++ code, then we run the LLDB debugger and break on main. We go through each instruction in-depth to learn how the CPU uses mov, call, add, and jmp.

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