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libasm

Ecole 42 project — reimplementing standard C library functions in x86-64 Assembly.

The goal is to understand how the machine works at the lowest level: registers, the System V AMD64 ABI calling convention, memory addressing, and how everyday C functions are actually built without any C allowed. Pure .s files compiled with NASM into a static library. Syscall errors must be properly handled and errno must be set accordingly.

Functions

Function Reimplements
ft_strlen strlen(3)
ft_strcpy strcpy(3)
ft_strcmp strcmp(3)
ft_write write(2)
ft_read read(2)
ft_strdup strdup(3)
ft_calloc calloc(3)

Build & Test

# Compile the library
make

# Run test suite
make test
./test_libasm

# Clean objects only
make clean

# Clean everything (objects + library + tests)
make fclean

# Rebuild everything
make re

Structure

libasm/
├── Makefile
├── main.c
├── include/
│   └── libasm.h
└── src/
    ├── ft_strlen.s
    ├── ft_strcpy.s
    ├── ft_strcmp.s
    ├── ft_write.s
    ├── ft_read.s
    ├── ft_strdup.s
    └── ft_calloc.s

Technical notes

  • Assembler: NASM
  • Syntax: Intel
  • Format: ELF64 (Linux x86-64)
  • Inline ASM: not allowed — only .s files
  • Flag: -no-pie is forbidden
  • Calling convention: System V AMD64 ABI

References