hello.asm

;Hello world in x86 assembly syntax (for nasm)
;to compile and run:
;$ yasm -f elf hello.asm 2>&1
;$ ld -m elf_i386 -s -o hello *.o 2>&1

section .text
    global _start   ;declared for linker 
_start:             ;linker entry point
    mov edx,len     ;message len
    mov ecx,msg     ;message to write
    mov ebx,1       ;stdout
    mov eax,4       ;sys_write
    int 0x80        ;kernel
    
    mov eax,1       ;sys_exit
    int 0x80        ;kernel

section .data
msg db 'Hello, world!', 0xa  ;the string
len equ $ - msg     ;length the string