ldrlabel.s

ARM在Embest 下的 运用源码.可以直接在Embest下运行

#        AREA LDRlabel, CODE,READONLY
#        ENTRY                           ; Mark first instruction
.text

start:
        BL      func1                   /*  Branch to first subroutine */
        BL      func2                   /*  Branch to second subroutine */

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


func1:
        LDR     r0, =start              /*  => LDR R0,[PC, #offset to 
                                                                Litpool 1] */
        LDR     r1, =Darea +12 			/*  => LDR R1,[PC, #offset to
                                                                Litpool 1] */
        LDR     r2, =Darea + 6000       /*  => LDR R2, [PC, #offset to 
                                                                Litpool 1] */
        MOV     pc,lr                   /*  Return */

#        LTORG                           /*  Literal Pool 1 */
.ltorg
#.long 0x20026

func2:
        LDR     r3, =Darea +6000  /*  => LDR r3, [PC, #offset to */
                                        /*                        Litpool 1] */
                                        /*  (sharing with previous literal) */
        /*  LDR   r4, =Darea +6004        /*  If uncommented will produce an */
                                        /*  error as Litpool 2 is out of range */
        MOV     pc, lr          /*  Return */
.ltorg

Darea:
	.fill	8000         	 	/*  Clears a 8000 byte area of memory, 
                                          starting at the current location,
                                          to zero. */

.end
#      END           		/*  Literal Pool 2 is out of
                                          range of the LDR instructions
                                          above */