;  hello.asm  a first program for nasm for Linux, Intel, gcc
;
; assemble:	nasm -f elf -l hello.lst  hello.asm
; link:		gcc -o hello  hello.o
; run:	        hello
; output is:	Hello World

%include "config.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 main		; make label available to linker
main:				; 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 sysout command to int 80 hex
	int	0x80		; interrupt 80 hex, call kernel

	mov	ebx,HELLO	; exit code, 0=normal
	mov	eax,1		; exit command to kernel
	int	0x80		; interrupt 80 hex, call kernel
