hello-world.slq

;
; hello-world.slq
; subleq
;
; Created by R J Cooper on 10/09/2011.
; Copyright 2011 Mountainstorm. All rights reserved.
;
; a basic test of the assembler/machine but with some basic
; processor features added e.g registers
;
; it will derive the address of printf, then call it to 
; print "Hello World"
;

jmp main

.fill		1024
stack:

main:
; setup sp
mov .offset stack, sp

;
; find printf - dysym(RTLD_DEFAULT, "printf")
;

; push real address of "printf"
mov .offset printfStr, r0
add bar, r0
push r0

; push RTLD_DEFAULT
push -2

; push address and call out to it
push dlsym
callc
mov [sp], printf

; reset sp
mov .offset stack, sp

;
; call printf - printf("Hello World")
;

; push helloStr
mov .offset helloStr, r0
add bar, r0
push r0

; push address and call out to it
push printf
callc

halt

Z: 			.int 		0
r0:			.int 		0
sp: 		.int 		0
bar: 		.int 		0
dlsym: 		.int 		0
printf:		.int		0
helloStr:	.ascii		"Hello World"
printfStr:	.ascii		"printf"