匯編語言 廖建明主編 第六章習題答案

第六章習題答案6.1 C6.2 D6.3 D6.4 C 6.5 B6.6 錯。在L0: MOV AL,0語句后面加上RET語句6.7段內調用：保存IP內容入棧；更新IP內容段間調用：保存CS，IP內容入棧；更新CS，IP內容6.8段內返回：從棧中彈出一個字的內容送入IP寄存器；SP=(SP)+n(如果帶有操作數n)段間返回：從棧中彈出兩個字的內容分別送入IP，CS；SP=(SP)+n(如果帶有操作數n)6.9從棧中彈出兩個字的內容分別送入IP，CS；SP=(SP)+46.10在需要和主程序共享寄存器的時候需要保護寄存器6.11寄存器傳遞參數；堆棧傳遞參數；地址表傳遞參數6.12相同點：都進行一次程序跳轉不同點：CALL會保存原地址IP入棧，而JMP不會6.13錯誤：子程序是FAR類型的，CALL時用的是NEAR6.14BX;(BX);SHIFT6.15圖略6.16DATA SEGMENT N DB 5DATA ENDSSTACK SEGMENTDW 20H DUP(0)STACK ENDSCODE SEGMENTASSUME CS:CODE,DS:DATA,SS:STACKBEGIN:MOV AX,DATAMOV DS,AXMOV AL,NCALL FACT;調用階乘子程序計算5!MOV RESULT,DXDEC NMOV AL,NCALL FACT;調用階乘子程序計算4!ADD RESULT,DXDEC NMOV AL,NCALL FACT;調用階乘子程序計算3!ADD RESULT,DXMOV AH,4CHINT 21HFACT PROC NEAR;階乘子程序MOV DX,1CMP AL,0JZ DONEPUSH AXDEC ALCALL FACTPOP AXMUL DLMOV DX,AXDONE:RETFACT ENDPCODE ENDSEND BEGIN6.17略618（1）寄存器傳值MOV AX,DATAMOV DS,AXMOV SI,OFFSET NUMMOV CX,COUNTMOV DX，0CALL FMOV AH,4CHINT 21HF PROCLOP:MOV DI,OFFSET NUM20ADD DI，DXINC DXXOR BL,BLMOV AX,SILOP20:CMP AX,20JC SUB5SUB AX,20INT BLJMP LOP20SUB5:MOV DI,BLXOR BL,BLLOP5:CMP AX,5JC SUB2SUB AX,5INT BLJMP LOP5SUB2:ADD DI,COUNT； DI=DI+2*COUNTMOV DI,BLXOR BL,BLLOP2:CMP AX,2JC SUB1SUB AX,2INT BLJMP LOP2SUB1:ADD DI,COUNT SHL 1；DI=DI+2*COUNTMOV DI,BLXOR BL,BLLOP1:CMP AX,1JC DONESUB AX,1INT BLJMP LOP1DONE：ADD DI，COUNT ADD DI，COUNTADD DI，COUNT；DI=DI+3*COUNTMOV DI，BLADD SI，2LOOP LOPRETF ENDPEODE ENDS（2）堆棧傳值BEGIN:MOV AX,DATAMOV DS,AXMOV SI,OFFSET NUMMOV DI OFFSET NUM20MOV CX,COUNTPUSH SIPUSH DIPUSH CXCALL FMOV AH,4CHINT 21HF PROCPUSH AXPUSH BXPUSH CXPUSH SIPUSH DIMOV BP,SPMOV CX,12BPMOV DI,14BPMOV SI,16BPLOP:XOR BL,BLMOV AX,SILOP20:CMP AX,20JC SUB5SUB AX,20INC BLJMP LOP20SUB5:MOV DI,BLXOR BL,BLLOP5:CMP AX,5JC SUB2SUB AX,5INC BLJMP LOP5SUB2:MOV DI+COUNT,BLXOR BL,BLLOP2:CMP AX,2JC SUB1SUB AX,2INC BLJMP LOP2SUB1:MOV DI+COUNT+COUNT,BLXOR BL,BLLOP1:CMP AX,1JC DONESUB AX,1INC BLJMP LOP1DONE:MOV DI+COUNT+COUNT+COUNT,BLADD SI,2INT DILOOP LOPRETF ENDPCODE ENDSEND BEGIN