;  ###----------------------------------------------------------------###
;  # file	: exc100.u						#
;  # date	: Mar 26 1996						#
;  # descr.	: functional test for mips				#
;  ###----------------------------------------------------------------###

	;  ###--------------------------------------------------------###
	;  #   exceptions :						#
	;  #     - data address miss alignment (when loading a word)	#
	;  ###--------------------------------------------------------###

adr		.equ	0x40000050		; word address
data		.equ	0x9043ad6b		; data

		.org	0x00400000
		.start	init

init:
		loadi	r31, back_from_exception
		loadi	r1 , adr		; word's address
		loadi	r2 , data		; init. r2 with a data
		loadi	r3 , data		; init. r3 with the same value

	;  ###--------------------------------------------------------###
	;  #   load a word at a miss aligned address (data address	#
	;  # alignment exception)					#
	;  ###--------------------------------------------------------###

		lw	r2 , 1 (r1 )		; EXCEPTION (alignement)
		nop

	;  ###--------------------------------------------------------###
	;  #   check that the load has faild and the content of the	#
	;  # register has not been altered				#
	;  ###--------------------------------------------------------###

back_from_exception:
		                		; check that the lw has failed
		beq	r3 ,r2, good		; jump to good if OK
		nop
		j	bad
		nop

		.org	0x004000D0
good:		j	good
		nop
		.org	0x004000D8
bad:		j	bad
		nop

		.end