Add test for dbt/rtd instructions

sim/testsuite/d30v-elf/os-dbt.S

@@ -0,0 +1,38 @@
+	.globl _start
+	#
+	# NOTE:	Registers r10-r11 are reserved for the interrupt handler
+	#	while the others can be used by the main loop/start code.
+
+_start:		
+	# patch the DBT handler
+	add r1, r0, handler
+	ldw r2, @(r1, 0)
+	ldw r3, @(r1, 4)
+	# DBT vector address
+	add r1, r0, 0xfffff120
+	stw r2, @(r1, 0)
+	stw r3, @(r1, 4)
+
+	# try out the breakpoint/return
+	add r2, r0, 47
+	#dbt
+	nop
+	.long 0x00b00000
+	nop
+
+	# exit with what ever the breakpoint hander set r2 to.
+	nop
+	.long 0x0e000004
+	nop
+
+handler:
+	jmp real_handler
+	
+	# The Breakpoint handler sets r2 to 0 if PSW was set correctly.
+real_handler:
+	mvfsys r2, cr0
+	sub r2, r0, 0x08000000
+	#rtd
+	nop
+	.long 0x00a00000
+	nop