#        AREA    Jump, CODE, READONLY    ;  name this block of code
.text
.equ	num, 2						/* Number of entries in jump table 			*/

#        ENTRY						/*  mark the first instruction to call 		*/

start:
        MOV     r0, #0  			/*  set up the three parameters 			*/
        MOV     r1, #3
        MOV     r2, #2
        BL      arithfunc       	/*  call the function 						*/

stop:
        MOV     r0, #0x18			/*  angel_SWIreason_ReportException 		*/
        LDR     r1, =0x20026    	/*  ADP_Stopped_ApplicationExit 			*/
        SWI     0x123456			/*  Angel semihosting ARM SWI 				*/

arithfunc:                       	/*  label the function 						*/
        CMP     r0, #num        	/*  Treat function code as unsigned integer */
        BHS     DoAdd           	/*  If code is >=2 then do operation 0. 	*/

        ADR     r3, JumpTable   	/*  Load address of jump table 				*/
        LDR     pc, [r3,r0,LSL#2]	/*  Jump to the appropriate routine 		*/

JumpTable:
        .long     DoAdd
        .long     DoSub

DoAdd:
        ADD     r0, r1, r2      	/*  Operation 0, >1 						*/
        MOV     pc, lr  			/*  Return 									*/

DoSub:
        SUB     r0, r1, r2      	/*  Operation 1 							*/
        MOV     pc,lr           	/*  Return 									*/

.end
#        END             			/*  mark the end of this file 				*/