segment .data msg: db "Hello World!",0x0a ; String to print len: equ $-msg ; Length of the string segment .text global main ; Announce main to the linker extern write, exit main: push rbp mov rbp, rsp mov edx, len ; Argument 3 is the length to write lea rsi, [msg] ; Argument 2 for the write call mov edi, 1 ; Argument 1 for the write call write xor edi, edi ; 0 return status = success call exit