AREA StrCopy, CODE, READONLY
ENTRY ; mark the first instruction to call
start
LDR r1, =srcstr ; pointer to first string
LDR r0, =dststr ; pointer to second string
BL strcopy ; call subroutine to do copy
stop
MOV r0, #&18 ; angel_SWIreason_ReportException
LDR r1, =0x20026 ; ADP_Stopped_ApplicationExit
SWI 0x123456 ; ARM semihosting SWI
strcopy
LDRB r2, [r1],#1 ; load byte and update address
STRB r2, [r0],#1 ; store byte and update address;
CMP r2, #0 ; check for zero terminator
BNE strcopy ; keep going if not
MOV pc,lr ; Return
AREA Strings, DATA, READWRITE
srcstr DCB "First string - source",0
dststr DCB "Second string - destination",0
END
以上是一条字符串拷贝程序，
程序执行到BL strcopy后，没有跳转到strcopy处，而是继续执行下一条语句（stop），请问为什么？ |
楼主
标题置顶
标题高亮
