ps2.as

; file ps.as - includes main routine of reversing string "abcdef"
	.entry	STRADD
	.entry	MAIN
	.extern	REVERSE
	.extern	PRTSTR
STRADD:	.data	0
STR:	.string "abcdef"
LASTCHAR:	.data	0
LEN:	.data	0
K:	.data	0
; count the length of string, print the original string, reverse string, print the reversed string.
MAIN:	lea/0	STR{LEN},STRADD
	jsr/0	COUNT
	jsr/0	PRTSTR
	mov/1/1/0	STRADD{5}, LASTCHAR{r3}
	mov/1/1/1	STR{7}, r7
	add/0	COUNT{K},r3
	dec/1/1/1	LASTCHAR{K}
	inc/0	K
	jsr/0	REVERSE
	jsr/0	PRTSTR
	stp/1/0