About
I’m Cha Seojun, a systems programmer and independent researcher deeply focused on understanding how computers work at the lowest level.
My work explores everything from:
- ARM Assembly and memory-level logic
- Linux Internals, syscalls, and ELF binaries
- Compilers & Toolchains — building from scratch in Common Lisp
- Bare-metal hardware emulation using QEMU
- FPGA-based CPU design with Verilog
- System Hacking and reverse engineering real-world binaries
I’m not just building projects — I’m building understanding.
Why this blog exists
This blog is my personal lab notebook. It’s where I:
- Document complex topics in a way that’s visually and logically clear
- Share real engineering struggles and breakthroughs
- Build public proof of work — one post, one project at a time
I believe the best way to learn is to build from scratch and break things along the way.
Currently Working On
-
From the Transistor
Designing a CPU → writing an assembler, compiler, and OS → running a real shell and browser on FPGA. -
ARM Assembly Tutorial
A step-by-step ARMv4 assembly tutorial designed for low-level programmers.
Covers instruction encoding, memory access, stack, branching, condition flags, and more — with hands-on examples and detailed explanations. -
mini-strace
A minimal Linux syscall tracer built with pure C.
Focused on understanding how ptrace intercepts syscalls, manages parent/child sync, and forms the core of tools likestrace.
Contact
- GitHub: seojuncha
- Email: sjcha36@gmail.com
Thanks for stopping by. Stay curious, and keep building.