ARM汇编编程-memory operation

;

; memory operation

;

 

              ;定义数据段

              AREA     memData,       DATA

      

char DCB       2, 3, 'a'                                ;定义字节

string  DCB "test sring", 0                         ;定义字符串

       ALIGN 4   ;对齐操作

hw          DCW      1234, 5678, 0xab, 0xcd12     ;定义半字

word       DCD 0x12345678, 0xffafd, 123    ;定义字

 

              ;定义代码段

              AREA     main,      CODE

              ENTRY

             

START

              LDR R0, =word                                 ;取word所对应地址

              LDR R1, [R0]                             ;读取[R0]中的值

              LDR R2, word

              LDR R3, [R0, #4]

             

              LDR R4, =string

              LDRB R5, [R4, #2]

             

              LDR R6, =hw

              LDRH R7, [R6, #2]             

             

STOP

              ;程序退出

              MOV R0, #0X18

              LDR R1, =0x20026

              SWI 0x123456

             

              END