汇编语言-002（.data、Equal、$、EQU 、MOV 、MOVSX、MOVZX）

1：变量相加程序

.386
.model flat,stdcall.stack 4096
ExitProcess PROTO,dwExitCode:DWORD.data
firstval DWORD 20002000h
secondval DWORD 11111111h
thirdval DWORD  22222222h
sum DWORD 0.code
main PROCmov eax,firstvaladd eax,secondvaladd eax,thirdvalmov sum,eaxINVOKE ExitProcess,0
main ENDP
END main

2：.data? 伪指令声明未初始化程序，当定义大量未初始化数据时，.data?伪指令减少了程序的大小

.386
.model flat,stdcall.stack 4096
ExitProcess PROTO,dwExitCode:DWORD.data 
smallArray DWORD 10 DUP(10)
.data?
bigArray DWORD 5000 DUP(?) ;20000个字节，未初始化.code 
main PROCINVOKE ExitProcess,0
main ENDP
END main

3：不用.data? 程序会比使用大

.386
.model flat,stdcall.stack 4096
ExitProcess PROTO,dwExitCode:DWORD.data 
smallArray DWORD 10 DUP(10)
bigArray DWORD 5000 DUP(?)  ;不用.data?,生的编译程序将会多出20000个字节.code 
main PROCINVOKE ExitProcess,0
main ENDP
END main

4：等号伪指令等号伪指令与宏定义差不多在汇编器预处理时替换的，不占内存，运行时数值不能变，$当前地址计数器符号，返回当前程序语句的偏移量

.386
.model flat,stdcall.stack 4096
ExitProcess PROTO,dwExitCode:DWORD.data
selfPtr DWORD $  ;$当前地址计数器符号，返回当前程序语句的偏移量
selfPPtr DWORD selfPtr ;与上面一样;等号伪指令与宏定义差不多在汇编器预处理时替换的，不占内存，运行时数值不能变COUNT = 10  
array  DWORD COUNT DUP(0)  .code
main PROCINVOKE ExitProcess,0
main ENDP
END main

5：使用$计算数组长度

.386
.model flat,stdcall.stack 4096
ExitProcess PROTO,dwExitProcess:DWORD.data
list BYTE 10,20,30,40
listSize = ($-list)  ;使用$计算数组长度时$前不能有别的数据myString BYTE "This is a long String"BYTE "any number of character"
Ssize = ($-myString)Wlist WORD 10,20,30,40
WlistSize = ($-Wlist)/2  ;除以WORD的长度.code
main PROCINVOKE ExitProcess,0
main ENDP
END main

6：EQU 伪指令使用，也是类似宏

.386
.model flat,stdcall.stack 4096
ExitProcess PROTO,dwExitCode:DWORD.data
pressKey EQU <"Press any key to continue....",0>
prompt BYTE pressKey   ;pressKey直接把里面的当做文本数据保存到promptmatrix1 EQU 10*10
matrix2 EQU <10*10> M1 WORD matrix1 ;等于M2 WORD 100
M2 WORD matrix2 ;等于M2 WORD 10*10 <>括号内的数据直接复制到M2.code
main PROCINVOKE ExitProcess,0
main ENDP
END main

7：TextEQU文本宏使用，与EQU类似，如果用<>括号都复制替换里面的内容

.386
.model flat,stdcall.stack 4096
ExitProcess PROTO,dwExitCode:DWORD.data
contiuneMsg TEXTEQU <"Do you wish co continue(Y/N)？">
prompt1 BYTE contiuneMsg;文本宏可以相互构建
rowSize = 5
count TEXTEQU %(rowSize * 2)  ;分配整数表达式
move TEXTEQU <mov>            ;分配文本
setupAL TEXTEQU <move al,count>P1 TEXTEQU <"proc">
P2 TEXTEQU <P1,"edure">
S BYTE P2     ;S 等于“procedure.code
main PROCsetupAL  ;等于 mov al,10INVOKE ExitProcess,0
main ENDP
END main

8：mov伪指令使用

.386
.model flat,stdcall.stack 4096
ExitProcess PROTO,dwExitCode:DWORD.data
oneByte BYTE 78h
oneWord WORD 1234h
oneDword DWORD 12345678h.code
main PROCmov eax,0mov al,oneBytemov ax,oneWordmov eax,oneDwordmov ax,0INVOKE ExitProcess,0
main ENDP
END main

9：使用mov处理较小有符号数向较大寄存器赋值

.386
.model flat,stdcall.stack 4096
ExitProcess PROTO,dwExitCode:DWORD.data
signedVal SWORD -16.code
main PROCmov ecx,0FFFFFFFFhmov cx,signedValINVOKE ExitProcess,0
main ENDP
END main

10：MOVSX伪指令，符号位扩展赋值

.386
.model flat,stdcall.stack
ExitProcess PROTO,dwExitCode:DWORD.data
byteVal BYTE 10001111b
.code
main PROCmovsx ax,byteValmov bx,0A69Bhmovsx eax,bxmovsx edx,blmovsx cx,blINVOKE ExitProcess,0
main ENDP
END main

11：MOVZX伪指令，零扩展赋值

.386
.model flat,stdcall.stack 4096
ExitProcess PROTO,dwExitCode:DWORD.data
byteVal BYTE 10001111b
.code
main PROCmovzx ax,byteValmov bx,0A69Bhmovzx eax,bxmovzx edx,blmovzx cx,blINVOKE ExitProcess,0
main ENDP
END main