ASM Syscall Calculator

🇬🇧 English | 🇷🇺 Русский

A simple command-line calculator written in x86-64 Assembly using raw Linux system calls (without libc).

Features

• Integer addition
• Integer subtraction
• Integer multiplication
• Integer division
• Division-by-zero handling
• Invalid operation handling
• Manual string-to-integer conversion
• Manual integer-to-string conversion
• Raw Linux syscalls (read, write, exit)
• No libc dependency
• ANSI color support for UI elements
• Screen clearing on startup
• Exit on 'q' input at any prompt
• NASM syntax

Requirements

• Linux
• NASM
• GNU LD
• GNU Make

Build

make

Manual build:

nasm -f elf64 src/main.asm -o bin/obj/main.o
ld bin/obj/main.o -o bin/out/calculator

Run

make run

or

./bin/out/calculator

Example

Project Structure

.
├── src/
│   └── main.asm
├── notes/
├── bin/
├── Makefile
├── LICENSE
└── README.md

About

This is my first calculator written entirely with raw Linux system calls.

The project was created to practice x86-64 Assembly, Linux syscalls, manual input/output handling, string parsing, and integer formatting without using the C standard library.

Roadmap

• Calculator on libc (System V ABI) - 🔗 asm-calc-libc
• Calculator on raw syscalls (no libc) - 🔗 asm-calc-syscall
• 16-bit BIOS calculator with custom bootloader - 🔗 asm-calc-bios

License

MIT

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