libasm

The libasm project is an introduction to assembly language programming. The goal is to write a library of basic functions in x86-64 assembly and understand how low-level programming works. This project will challenge you to think differently about how code is executed at the hardware level and how high-level languages like C interact with assembly.

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Objectives

• Write a library of functions in x86-64 assembly.
• Learn the basics of assembly language, including registers, instructions, and memory management.
• Understand how to call assembly functions from C programs.
• Implement common functions like strlen, strcpy, strcmp, and more in assembly.
• Gain a deeper understanding of how low-level programming works.

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Requirements

• NASM: Netwide Assembler for compiling assembly code.
• GCC: GNU Compiler Collection for compiling C code.
• Make: For automating the build process.
• Basic knowledge of C programming and low-level concepts (registers, stack, etc.).

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Project Structure

The project consists of implementing a set of functions in assembly and creating a static library (libasm.a) that can be linked with C programs. The functions to implement are:

Mandatory Functions

1. ft_strlen: Calculate the length of a string.
2. ft_strcpy: Copy a string from source to destination.
3. ft_strcmp: Compare two strings.
4. ft_write: Write to a file descriptor (similar to the write system call).
5. ft_read: Read from a file descriptor (similar to the read system call).
6. ft_strdup: Duplicate a string (similar to the strdup function).

Bonus Functions (Optional)

1. ft_atoi_base: Convert a string to an integer with a given base.
2. ft_list_push_front: Add an element to the beginning of a linked list.
3. ft_list_size: Calculate the size of a linked list.
4. ft_list_sort: Sort a linked list.
5. ft_list_remove_if: Remove elements from a linked list based on a condition.

Resources

Calling convention