#        AREA ThumbSub, CODE, READONLY   ;  name this block of code
#        ENTRY                           ;  mark first instruction to execute
.text
.arm              			            /*  Subsequent instructions are ARM 	*/
header:
        ADR     r0, start + 1           /*  Processor starts in ARM state, 		*/
        BX      r0                      /*  so small ARM code header used 		*/
                                    	/*  to call Thumb main program. 		*/

        NOP
        NOP

.thumb
#        CODE16							/*  Subsequent instructions are Thumb.	*/
start:
        MOV     r0, #10                 /*  Set up parameters 					*/
        MOV     r1, #3
        BL      doadd                   /*  Call subroutine 					*/

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

doadd:
        ADD     r0, r0, r1              /*  Subroutine code 					*/
        MOV     pc, lr                  /*  Return from subroutine. 			*/

.end                                 	/*  Mark end of file 					*/