Archive - Confessions of a Code Addict

Making System Calls in x86-64 Assembly

Watch now | Privilege levels, syscall conventions, and how assembly code talks to the Linux kernel

Jun 16 •

Abhinav Upadhyay

31:44

One Law to Rule All Code Optimizations

A systems-level reasoning model for understanding why optimizations succeed or fail.

Jun 8 •

Abhinav Upadhyay

May 2025

Debugging X86-64 Assembly with GDB

Watch now (20 mins) | Learn how to inspect registers, step through instructions, and investigate crashes using GDB.

May 26 •

Abhinav Upadhyay

19:40

Building (and Breaking) Your First X86 Assembly Program

We build a minimal X86 assembly program, run it… and hit a crash. But that crash is exactly what makes this program worth writing.

May 16 •

Abhinav Upadhyay

The System-Level Foundation of Assembly

Tracing how the CPU, OS, and ELF format shape the structure of your assembly code

May 5 •

Abhinav Upadhyay

April 2025

Binary Arithmetic and Bitwise Operations for Systems Programming

Understand how computers represent numbers and perform operations at the bit level before diving into assembly

Apr 12 •

Abhinav Upadhyay

Understanding Computer Organization from First Principles

A ground-up model of how computers execute code, starting from logic gates and ending at the instruction cycle.

Apr 5 •

Abhinav Upadhyay

March 2025

Hardware-Aware Coding: CPU Architecture Concepts Every Developer Should Know

Write faster code by understanding how it flows through your CPU

Mar 21 •

Abhinav Upadhyay

Python Performance: Why 'if not list' is 2x Faster Than Using len()

Discover why 'if not mylist' is twice as fast as 'len(mylist) == 0' by examining CPython's VM instructions and object memory access patterns.

Mar 12 •

Abhinav Upadhyay

February 2025

My Top 15 OS Books: From Theory and Implementation to Systems Programming

A personal guide to the most useful books for understanding operating systems

Feb 18 •

Abhinav Upadhyay

Recording: How Modern CPUs Execute Your Code: A Deep Dive into Performance

Watch now | We concluded the latest live session yesterday.

Feb 10 •

Abhinav Upadhyay

1:21:15

January 2025

A Software Engineer's Guide to Reading Research Papers

My personal framework for reading research papers.

Jan 28 •

Abhinav Upadhyay

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