Nettet21. nov. 2016 · I would recommend the following steps. (1) Run mov ax,bx+si+1 through your assembler; inspect the binary code that gets generated. (2) Do the same for mov … Nettet31. des. 2024 · In this case the instruction MOV [AX], BX would do the job, not MOV AX, [BX]: This instruction does more or less the opposite of MOV AX, [BX]: It writes data to …
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Nettet4. mar. 2024 · 汇编语言直接偏移量操作数 变量名加上一个位移就形成了一个直接 - 偏移量操作数。这样可以访问那些没有显式标记的内存位置。假设现有一个字节数组 arrayB: arrayB BYTE 10h,20h,30h,40h,50h 用该数组作为 MOV 指令的源操作数,则自动传送数组的第一个字节: mov al,arrayB ;AL = 10h 通过在 arrayB 偏移量上加 1 ... Nettet2. jun. 2011 · To really explain the concept, we have to back up to the basic idea of segments, and how the x86 uses them (in real mode). The 8086 has 20-bit addressing, …
Nettet汇编作业集锦教材_试卷. 创建时间 2024/04/19. 下载量 0 Nettetmov al,1200h mov al,bx mov [si][di],ax mov es:[dx],cx mov [ax],value mov count,[si] 答案: mov ax,[cx]错。cx不能为间址寄存器 mov al,1200h错。立即数超出8位寄存器范围 mov al,bx错。两个操作数不匹配 mov [si][di],ax错。两个变址寄存器不能在一起 测试条件:sf=of或zf=1 sal算术左移指令 sar算术 ...
Nettet31. des. 2024 · In this case the instruction MOV [AX], BX would do the job, not MOV AX, [BX]: This instruction does more or less the opposite of MOV AX, [BX]: It writes data to memory. This time, the data in the register BX is written to the memory specified by the registers DS and AX. NettetBoth MOV and LEA instructions copy data from source to destination but the difference between them is LEA copies only offset address or a memory address to destination register. The syntax of LEA instruction is: LEA Reg, Source. For example: LEA AX, [BX] Stores the offset address of BX into AX. LEA CX, var_1 Stores the address of var_1 …
Nettet8. apr. 2024 · dosgroup:deviobuf mov word ptr [ioscnt],1 mov word ptr [deviobuf],ax iofunc2: test [si.fcb_devid],080h jnz iotodev jmp iotofile iotodev: invoke save_world push ds push ss pop es push ss pop ds assume ds:dosgroup xor bx,bx mov [iocall.reqstat],bx mov byte ptr [iomed],bl mov bx,offset dosgroup:iocall mov cx,(devrd shl 8) or drdwrhl …
Nettet20. feb. 2024 · 指操作数在存储器中,段内偏移地址由寄存器间接给出。能做寄存器间接寻址的寄存器只有3个——BX,SI,DI。 这三个寄存器默认的段地址默认在DS数据段. 如. dat1 DB 12H dat2 DB 34H 把dat1内容送给AL,寄存器间接寻址方式为: mov BX, OFFSET dat1 mov AL,[BX] cheesecake factory bread where to buyNettet一道汇编问题如下. 设数据段定义如下: (12~14题均采用该数据段)DATASEGMENTORG0100HX1DB25,’25’X2DW?Y1EQUX1Y2EQU$ … flcl progressive hipsterNettet13. jan. 2010 · MOV BX,OFFSET MYDAT[SI] ; 基址加寄存器不能取OFFSET,取地址要用LEA指令 CMP 15,BX ; 常数要写在右边 CMP OP1,OP2 (OP1,OP2是已经用DB定义的变量) ; CMP指令不能比较两个内存操作数 CMP OP1,25 ; 没问题 CMP AX,OP1 ; CMP指令比较的两个操作数类型要相同,AX是WORD类型,而OP1是BYTE类型 2.假设下列指令中的 … flcl progressive hidomi fatherNettet10. jul. 2013 · MOVBYTEPTR [DI],1000TESTAL, [BP]MOV [DI], [BX]SHR [BX] [SI],314.指令SUBAX, [BX]的源操作数的寻址方式是直接寻址15.将累加器AX内容清零的错误指令是AX,0B)XORAX,AXC)SUBAX,AXD)CMPAX,AX16.执行下列程序段后, (AX)=TABDWENTRYEQUMOVBX,OFFSETTABADDBX,ENTRYMOVAX, … cheesecake factory brea hoursNettet16. nov. 2024 · 1.段属性操作符SEG MOV AX,SEG NEXT (AX)=1000h 1 2 2.偏移量属性操作符OFFSET X1 DW 12H,100H MOV AX,OFFSET X1 (AX)=0000H 1 2 3 4 5 3.类 … cheesecake factory bridge streetNettetMOV BX, 1 MOV CX, 100 A: ADD AX, BX INC BX LOOP A HLT 执行后的结果为:(AX)= ( C ),(BX)= ( ). A 5050,99 B 2500,100 C 5050,101 D 2550,102 35. 逻辑位移指令SHR用于(D),而算术位移指令SAR 用于带符号数除2。 A 带符号数减2 B 带符号数除2 C 无符号数乘2 D 无符号数除2 39. 执行下列指令后: MOV AX, 1234H … cheesecake factory bread typeNettetBX, BLX, MOV PC, LDR PC . 6 64-bit Android on ARM, Campus London, September 20150839 rev 12368 Agenda Introduction ... Address to load/store from is a 64-bit base register plus an optional offset LDR X0, [X1] ; Load from address held in X1 STR X0, [X1] ; ... cheesecake factory brea linkedin