;  ###----------------------------------------------------------------###
;  # file	: exc017.u						#
;  # date	: Mar 26 1996						#
;  # descr.	: functional test for mips				#
;  ###----------------------------------------------------------------###

	;  ###--------------------------------------------------------###
	;  #   exceptions :						#
	;  #     - data bus error (when storing a word)			#
	;  ###--------------------------------------------------------###

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

	;  ###--------------------------------------------------------###
	;  #   store a word and dbe low (data bus error exception)	#
	;  #   berr is driven by mips_dec.vbe...			#
	;  ###--------------------------------------------------------###

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

	;  ###--------------------------------------------------------###
	;  # If exception has been trapped, exception handler had       #
	;  # copy r2 in r3.						#
	;  ###--------------------------------------------------------###

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

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

		.end