libasm

This school project's goal is to create a basic asm library. This branch is made for Mac , if you're a Linux user, please checkout to the right branch.

Table of Contents

ft_strlen | ft_strcpy | ft_strcmp | ft_write | ft_read | ft_strdup

ft_atoi_base | ft_list_push_front | ft_list_size | ft_list_sort | ft_list_remove_if

Prenambule

This code is made in 64 bits ASM with Intel syntax. Here is a quick reminder of things to know before jumping in the pool.

Registers

First six arguments are in rdi, rsi, rdx, rcx, r8d, r9d

Registers	Size
rax , rbx , rcx , rdx , rdi , rsi , rbp, rsp , r8 , r9 , ... , r15	64 bits
eax, ebx, ecx, edx, edi , esi , ebp, esp, r8d, r9d, ... , r15d	32 bits
ax, bx, cx, dx, di , si , bp, sp , r8w, r9w, ... , r15w	16 bits (15:0)
ah, bh, ch, dh	8 bits high (15:8)
al , bl , cl , dl , dil , sil , bpl , spl , r8b, r9b, ... , r15b	8 bits low (7:0)

Instructions

Move instruction and sizes

instruction	what does it do ?
mov (size) dest,src	dest ←src
movzx dest,src	same as move, fills the blanks with 0

Possible sizes name	size	c equivalent
byte	1 octet	char
word	2 octets ou 1 mot	short
dword	4 octets	int
qword	8 octets	long
tword	10 octets

Arithmetical instructions

instruction	What does it do ?
add op1,op2	op1 ←op1 + op2
sub op1,op2	op1 ←op1 −op2
neg reg	reg ←−reg
inc reg	reg ←reg + 1
dec reg	reg ←reg −1
imul dest,op	dest ←dest ×op

Stack

instruction	What does it do ?
push op	stores op (constant/64-bit) onto the stack
pop op	give last value from stack, rsp++

Bit operation

instruction	What does it do ?
and op1,op2	op1 ←op1 & op2
or op1,op2	op1 ←op1
xor op1,op2	op1 ←op1 ˆ op2
not reg	reg ← ̃reg

Tests

You can test this library with the main made in C. This whill also test the errno variable after a syscall. Just run make test.