;  ###----------------------------------------------------------------###
;  # file	: exc019.u						#
;  # date	: Mar 26 1996						#
;  # descr.	: functional test for mips				#
;  ###----------------------------------------------------------------###

	;  ###--------------------------------------------------------###
	;  #   exceptions :						#
	;  #     - data bus error (when loading an unsigned half)	#
	;  ###--------------------------------------------------------###

adr		.equ	0x400000C8		; data bus error address
data		.equ	0x9043ad6b		; data

		.org	0x00400000
		.start	init

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

	;  ###--------------------------------------------------------###
	;  #   load an unsigned half and dbe low (data bus error 	#
	;  # exception)	berr is driven by mips_dec.vbe...		#
	;  ###--------------------------------------------------------###

		lhu	r2 , 0 (r1 )		; EXCEPTION (data bus error)
		nop

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

back_from_exception:
		beq	r3 ,r2, good
		nop
		j	bad
		nop

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

		.end