Hello world assembly on x86 Linux

Hello world assembly on x86 Linux

Save code below as hello.asm

global _start

section .data
message: db 'hello, world!', 10

section .text
_start:
    mov     rax, 1          ; system call number should be stored in rax
    mov     rdi, 1          ; argument #1 in rdi, where to write (description)?
    mov     rsi, message    ; argument #2 in rsi, where does the string start?
    mov     rdx, 14         ; argument #3 in rdx, how many bytes to write?
    syscall                 ; this instruction invokes a system call

    mov     rax, 60         ; 'exit' syscall number
    xor     rdi, rdi
    syscall

Now assemble/build the file

nasm -felf64 hello.asm -o hello.o

Link to create executable

ld -o hello hello.o

Run it

u1@v1vm10:~$ ./hello 
hello, world!