Kuninoto / 42_libasm

Introduction to ASM. Some libc functions implemented in x86_64 ASM with Intel Syntax

libasm (42Porto - 42Cursus)  

Grade: 100/100

Overview

A few string manipulation functions and libc system call wrappers written in Assembly x86_64 with the Intel syntax

Installing and running the project:

1- Clone this repository

git clone https://github.com/Kuninoto/42_libasm

2- Navigate to libasm and run make

cd 42_libasm/libasm && make

3- make clean so that you don't keep those object files that you won't need anymore

make clean

4- Compile your programs with your new libasm.a

Example (C): cc -Wall -Wextra -Werror main.c libasm.a

Subject (v5): libasm en_subject

Makefile Available Targets:

make or make all - Makes libasm.a
make clean - Deletes all the resulting object files
make fclean - Deletes libasm.a and all the resulting object files
make re - Deletes everything (object files and libasm.a) and rebuilds libasm.a

Adding new functions to this library:

• Add their prototypes to libasm.h
• Add their source files to /libasm
• Add their source file names to the "GENERAL" variable inside the Makefile
• Rebuild the library with make re

To keep track of what's inside your resulting libasm.a run ar -t libasm.a

Useful links

You Can Learn Assembly in 10 Minutes (it’s easy)
How do I know what registers function parameters will be mapped on?
Syscalls(2) man page
Linux System Call Table for x86_64
x64 ASM Cheat Sheet
NASM tutorial
How does push and pop work in assembly
CPU Registers x86
Godbolt

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Made by Nuno Carvalho (Kuninoto) | [e-mail]