libasm (42Porto - 42Cursus)

Description

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

Grade: 100/100

Installing and running the project

1- Install dependencies

sudo apt install -y nasm

2- Clone this repository

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

3- Navigate to libasm/, assemble and wipe the artifact files

cd 42_libasm/libasm && make && make clean

4- Compile your program with your new libasm

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

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) | [email protected]