1 files changed, 40 insertions, 0 deletions
diff --git a/Bachelor/Mikroprozessorsysteme2/ARM202U/EXAMPLES/BASICASM/JUMP.S b/Bachelor/Mikroprozessorsysteme2/ARM202U/EXAMPLES/BASICASM/JUMP.S
new file mode 100644
index 0000000..fbcb4eb
--- /dev/null
+++ b/Bachelor/Mikroprozessorsysteme2/ARM202U/EXAMPLES/BASICASM/JUMP.S
@@ -0,0 +1,40 @@
+	AREA 	ArithGate, CODE	; name this block of code
+	ENTRY					; mark the first instruction to call
+main	
+	MOV		r0, #2			; set up three parameters
+	MOV		r1, #5
+	MOV		r2, #15
+	BL		arithfunc		; call the function
+	SWI		0x11			; terminate
+
+arithfunc					; label the function
+	CMP		r0, #4			; Treat code as unsigned integer
+	BHI		ReturnA1		; If code > 4 then return first
+							; argument
+	ADR		r3, JumpTable	; Load address of the jump table
+	LDR		pc,[r3,r0,LSL #2] ; Jump to appropriate routine
+
+JumpTable
+	DCD		ReturnA1
+	DCD		ReturnA2
+	DCD		DoAdd
+	DCD		DoSub
+	DCD		DoRsb
+
+ReturnA1
+	MOV		r0, r1			; Operation 0, >4
+	MOV	pc,lr
+ReturnA2
+	MOV		r0, r2			; Operation 1
+	MOV		pc,lr
+DoAdd
+	ADD		r0, r1, r2		; Operation 2
+	MOV		pc,lr
+DoSub
+	SUB		r0, r1, r2		; Operation 3
+	MOV		pc,lr
+DoRsb
+	RSB		r0, r1, r2		; Operation 4
+	MOV		pc,lr
+
+	END						; mark the end of this file