x86_64-libasm-runtime

Reimplementation of essential libc functions and linked list utilities in x86_64 assembly
Designed for low-level systems programming, runtime development, and performance-oriented C/C++ applications.

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🚀 Project Overview

This project is a runtime library implemented in x86_64 assembly, focusing on a minimal subset of libc functions and basic data structures. It follows the System V AMD64 ABI and Linux x86_64 syscall conventions.

Key features:

• ⚙️ Core libc-like functions (string, memory, etc.)
• 🔗 Basic linked list implementation
• 🧠 Strict adherence to x86_64 System V ABI
• 📡 Direct interaction with Linux kernel syscalls (no libc dependency)
• 🛠️ Easy to build and integrate into larger low-level libraries or runtime projects

The project demonstrates a deep understanding of assembly, ABI conventions, operating system interfaces, and low-level optimization, which is valuable for positions in systems programming and runtime development.

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🎯 Motivation

High-level libraries like glibc or musl abstract away many runtime details. This project allows you to:

• Understand function calling conventions, stack frames, and register usage
• Gain hands-on experience with syscall interfaces in user space
• Build independent low-level libraries with minimal dependencies
• Showcase skills relevant to systems programming, kernel/driver development, and embedded runtime environments

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📁 Project Structure

.
├── includes/           # Assembly & C headers
├── srcs/               # Assembly source files and C test file
├── Makefile            # Build scripts
└── libasm.pdf          # Design and implementation documentation

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🛠 Build & Usage

Clone the repository:

git clone https://github.com/TTSS0529/x86_64-libasm-runtime.git
cd x86_64-libasm-runtime

Build the library using Make:

make

The resulting object files or static library can be linked into C/C++ projects.

Test results:

make test
./asm_test_bonus

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Core Highlights

🧠 Syscall Layer

Assembly routines interact directly with the Linux kernel through syscall instructions, minimizing overhead and dependencies.

📜 ABI Compliance

All functions strictly follow the System V AMD64 ABI, ensuring compatibility with C code and predictable behavior across different calling contexts.

🔍 Linked List & Utilities

Provides fundamental linked list operations and memory/string utilities suitable for runtime use in low-level programs.

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💡 Career Relevance

This project highlights your expertise in:

• Low-level C/C++ programming
• Runtime library implementation
• System call and ABI conventions
• Performance and memory optimization

It is particularly relevant for roles such as:

• Systems Programmer
• Embedded C/C++ Developer
• Runtime/Compiler Engineer
• Operating System or Kernel Developer

License

This project is licensed under the MIT License. See the LICENSE file for details.