In this hands-on x86-64 assembly tutorial, we dive deep into moving integer data between registers and memory, working with pointers, dereferencing, and pointer arithmetic using YASM on Ubuntu.
You'll see practical examples of:
- Moving immediates and data between general-purpose registers
- Loading different sized integers (byte, word, dword, qword) from memory
- Why data size specifiers matter and what happens with overflow/underflow
- The difference between moving a pointer vs dereferencing it
- Pointer arithmetic to access array elements
- Using LEA for address calculation without dereferencing
- Debugging with GDB to inspect registers step-by-step
Perfect for anyone learning low-level programming, systems programming, or wanting to truly understand how pointers work at the assembly level. No prior expert knowledge required - we build it up with clear examples.
Code and examples are shown live, compiled with YASM, linked with LD, and debugged with GDB.
If you're into assembly, reverse engineering, operating systems, or just love understanding how computers really work, this one is for you.
Introduction to Integer Data Movement and Pointers 00:00:00
Program Setup and Makefile 00:01:16
Data Section Definitions 00:01:38
System Calls for Output and Exit 00:01:52
Text Section and Entry Point 00:04:21
Printing Hello String 00:05:05
Moving Immediates to Registers 00:06:04
Copying Between Registers 00:06:27
Dereferencing Pointers from Memory 00:07:16
Specifying Data Sizes 00:08:01
Register Size Variants 00:09:45
Reference Book Explanation 00:10:50
Loading Words and Bytes 00:13:25
Debugger Breakpoint and Registers 00:14:28
Overflow Demonstration 00:16:25
Makefile Adjustments for Warnings 00:17:44
Proving Data Size Importance 00:20:32
Underflow and Overflow Examples 00:21:34
Symbols as Pointers 00:24:16
Array Definitions and Access 00:25:20
Pointer to Array Items 00:26:08
LEA Instruction for Addresses 00:27:32
Dereferencing Manipulated Pointers 00:29:01
Final Register Inspection 00:29:50
Conclusion and Subscribe Request 00:33:26
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