word.s

来自「一些ARM的源程序」· S 代码 · 共 32 行

#        AREA Word, CODE, READONLY       ; name this block of code
.text
.equ	num, 20          		/* Set number of words to be copied */

#        ENTRY                   ; mark the first instruction to call

start:
        LDR     r0, =src        /* r0 = pointer to source block */
        LDR     r1, =dst        /* r1 = pointer to destination block */
        MOV     r2, #num        /* r2 = number of words to copy */
        
wordcopy:
        LDR     r3, [r0], #4    /* a word from the source */
        STR     r3, [r1], #4    /* store a word to the destination */
        SUBS    r2, r2, #1      /* decrement the counter */
        BNE     wordcopy                /* ... copy more */

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

#        AREA Block, DATA, READWRITE
.data
src:
     	.long	1,2,3,4,5,6,7,8,1,2,3,4,5,6,7,8,1,2,3,4
dst:
		.long	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0

.end