45 lines
992 B
NASM
45 lines
992 B
NASM
; 实验七-1: 字符串复制程序 - 使用REP MOVSB
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; 功能: 将源字符串复制到目标字符串
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DATAS SEGMENT
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SOURCE DB 'Hello, Assembly!', 0 ; 源字符串，以0结尾
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DEST DB 20 DUP(?) ; 目标字符串缓冲区
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DEST_END DB 0 ; 目标字符串结束标记
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DATAS ENDS
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STACKS SEGMENT
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DB 64 DUP(?)
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STACKS ENDS
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CODES SEGMENT
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ASSUME CS:CODES, DS:DATAS, SS:STACKS
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START:
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MOV AX, DATAS
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MOV DS, AX
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MOV ES, AX ; 设置ES为同一数据段
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LEA SI, SOURCE ; SI指向源字符串
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LEA DI, DEST ; DI指向目标字符串
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; 计算源字符串长度
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MOV CX, 0
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COUNT_LOOP:
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CMP BYTE PTR [SI + CX], 0
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JE COPY_START
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INC CX
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JMP COUNT_LOOP
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COPY_START:
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; 使用REP MOVSB复制字符串
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REP MOVSB
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; 添加字符串结束符
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MOV BYTE PTR [DI], 0
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; 程序结束
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MOV AH, 4CH
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INT 21H
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CODES ENDS
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END START |