填空题

下面的8086/8088汇编语言程序中，主程序通过堆栈将有关信息传送给子程序STRLEN。在主程序的______处填空，使程序能正常运行。
DSEG SEGMENT
ARRAY DB ’Computer$’
NUM DW 0
DSEG ENDS
SSEG SEGMENT STACK
DB 256 DUP (0)
SSEG ENDS
CSEG1 SEGMENT
ASSUME DS: DSEG, SS: SSEG, CS: CSEG1
START: MOV AX, DSEG
MOV DS, AX
MOV AX, OFFSET ARRAY
PUSH AX
CALL
MOV NUM, AX
MOV AH, 4CH
INT 21H
CSEG1 ENDS
CSEG2 SEGMENT
ASSUME DS: DSEG, SS: SSEG, CS: CSEG2
STRLEN PROC FAR
PUSH BP
MOV BP, SP
PUSH SI
MOV SI,[BP+6]
NEXT: CMP BYTE PTR [SI],’$’
JZ DONE ;串尾吗
INC SI
JMP NEXT
DONE: MOV AX, SI
SUB AX, [BP+6]
POP SI
POP BP
RET 2
STRLEN ENDP
CSEG2 ENDS
END START