新手求教，用debug的时候没死循环，直接运行时出现死循环，是哪错啦
程序代码：S1 SEGMENT
STRING DB 'Hello,world!' ,0DH,0AH,24H
S1 ENDS
S2 SEGMENT PARA STACK
DW 20H DUP(?)
TOP LABEL WORD
S2 ENDS
S3 SEGMENT
ASSUME DS:S1,SS:S2,CS:S3
P PROC FAR
MOV AX , S1
MOV DS , AX
MOV AX , S2
MOV SS , AX
LEA SP ,TOP
LEA SI,STRING
ADD SI,11
MOV CX ,12
L1:MOV DL ,[SI]
MOV AH ,2
INT 21H
DEC SI
LOOP L1
P ENDP
S3 ENDS
END P
