;  ###----------------------------------------------------------------###
;  # file	: exc003.u						#
;  # date	: Mar 26 1996						#
;  # descr.	: functional test for mips				#
;  ###----------------------------------------------------------------###

	;  ###--------------------------------------------------------###
	;  #   exceptions :						#
	;  #     - overflow (when subtracting from a positive number)	#
	;  ###--------------------------------------------------------###

data		.equ	0x52d4aec6		; a big positive data

		.org	0x00400000
		.start	init

init:
		loadi	r31, back_from_exception
		loadi	r10, data		; big positive data in r10
		loadi	r11, data		; same data in r11

	;  ###--------------------------------------------------------###
	;  #   substract generating an overflow				#
	;  ###--------------------------------------------------------###

		sub	r12, r0 , r10
		sub	r10, r12, r10		; EXCEPTION (overflow)

	;  ###--------------------------------------------------------###
	;  #   after returning from exception check that r10 has not	#
	;  # been altered						#
	;  ###--------------------------------------------------------###

back_from_exception:
	        bne	r10, r11,bad
		nop
		j	good
		nop

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