; hello.asm a first program for nasm for Linux, Intel, gcc ; http://www.csee.umbc.edu/help/nasm/hello.asm SECTION .data ; data section msg: db "Hello, World!",10 ; the string to print, 10 = CR len: equ $-msg ; "$" means "here" ; len is a value, not an address SECTION .text ; code section global _start ; make label available to linker _start: ; standard gcc entry point mov edx,len ; arg3, length of string to print mov ecx,msg ; arg2, pointer to string mov ebx,1 ; arg1, where to write, screen mov eax,4 ; write command to int 80 hex int 0x80 ; interrupt 80 hex, call kernel mov ebx,0 ; exit code, 0=normal mov eax,1 ; exit command to kernel int 0x80 ; interrupt 80 hex, call kernel