Assembly 翻转EAX寄存器的内容
我正在尝试创建一个程序(使用汇编),允许您输入一个字,然后加密,然后解密 我现在掌握的代码与我所追求的正好相反 目前EAX寄存器为00000037 我希望它是00000073 如何做到这一点Assembly 翻转EAX寄存器的内容,assembly,Assembly,我正在尝试创建一个程序(使用汇编),允许您输入一个字,然后加密,然后解密 我现在掌握的代码与我所追求的正好相反 目前EAX寄存器为00000037 我希望它是00000073 如何做到这一点 提前感谢。以下是翻转EAX内容的代码,由GUI Turbo Assembler x64()制作,它的作用如下: 为EAX=1234567890分配一个大数字 显示EAX(将EAX转换为字符串并显示消息) Flip EAX=“0987654321”(逐个提取数字并以相反顺序存储在字符串中) 用消息显示此字符
提前感谢。以下是翻转EAX内容的代码,由GUI Turbo Assembler x64()制作,它的作用如下:
.model small
.586
.stack 100h
.data
msj1 db 13,10,'Original EAX = $'
msj2 db 13,10,'Flipped EAX = $'
msj3 db 13,10,'New EAX = $'
buf db 11 ;MAX NUMBER OF CHARACTERS ALLOWED (4).
db ? ;NUMBER OF CHARACTERS ENTERED BY USER.
db 11 dup (?) ;CHARACTERS ENTERED BY USER.
.code
start:
;INITIALIZE DATA SEGMENT.
mov ax, @data
mov ds, ax
;CONVERT EAX TO STRING TO DISPLAY IT.
call dollars ;NECESSARY TO DISPLAY.
mov eax, 1234567890
call number2string ;PARAMETER:AX. RETURN:VARIABLE BUF.
;DISPLAY 'ORIGINAL EAX'.
mov ah, 9
mov dx, offset msj1
int 21h
;DISPLAY BUF (EAX CONVERTED TO STRING).
mov ah, 9
mov dx, offset buf
int 21h
;FLIP EAX.
call dollars ;NECESSARY TO DISPLAY.
mov eax, 1234567890
call flip_eax ;PARAMETER:AX. RETURN:VARIABLE BUF.
;DISPLAY 'FLIPPED EAX'.
mov ah, 9
mov dx, offset msj2
int 21h
;DISPLAY BUF (EAX FLIPPED CONVERTED TO STRING).
mov ah, 9
mov dx, offset buf
int 21h
;CONVERT STRING TO NUMBER (FLIPPED EAX TO EAX).
mov si, offset buf ;STRING TO REVERSE.
call string2number ;RETURN IN EBX.
mov eax, ebx ;THIS IS THE NEW EAX FLIPPED.
;CONVERT EAX TO STRING TO DISPLAY IT.
call dollars ;NECESSARY TO DISPLAY.
call number2string ;PARAMETER:EAX. RETURN:VARIABLE BUF.
;DISPLAY 'NEW EAX'.
mov ah, 9
mov dx, offset msj3
int 21h
;DISPLAY BUF (EAX CONVERTED TO STRING).
mov ah, 9
mov dx, offset buf
int 21h
;WAIT UNTIL USER PRESS ANY KEY.
mov ah, 7
int 21h
;FINISH PROGRAM.
mov ax, 4c00h
int 21h
;------------------------------------------
flip_eax proc
mov si, offset buf ;DIGITS WILL BE STORED IN BUF.
mov bx, 10 ;DIGITS ARE EXTRACTED DIVIDING BY 10.
mov cx, 0 ;COUNTER FOR EXTRACTED DIGITS.
extracting:
;EXTRACT ONE DIGIT.
mov edx, 0 ;NECESSARY TO DIVIDE BY EBX.
div ebx ;EDX:EAX / 10 = EAX:QUOTIENT EDX:REMAINDER.
;INSERT DIGIT IN STRING.
add dl, 48 ;CONVERT DIGIT TO CHARACTER.
mov [ si ], dl
inc si
;NEXT DIGIT.
cmp eax, 0 ;IF NUMBER IS
jne extracting ;NOT ZERO, REPEAT.
ret
flip_eax endp
;------------------------------------------
;CONVERT STRING TO NUMBER IN EBX.
;SI MUST ENTER POINTING TO THE STRING.
string2number proc
;COUNT DIGITS IN STRING.
mov cx, 0
find_dollar:
inc cx ;DIGIT COUNTER.
inc si ;NEXT CHARACTER.
mov bl, [ si ]
cmp bl, '$'
jne find_dollar ;IF BL != '$' JUMP.
dec si ;BECAUSE IT WAS OVER '$', NOT OVER THE LAST DIGIT.
;CONVERT STRING.
mov ebx, 0
mov ebp, 1 ;MULTIPLE OF 10 TO MULTIPLY EVERY DIGIT.
repeat:
;CONVERT CHARACTER.
mov eax, 0 ;NOW EAX==AL.
mov al, [ si ] ;CHARACTER TO PROCESS.
sub al, 48 ;CONVERT ASCII CHARACTER TO DIGIT.
mul ebp ;EAX*EBP = EDX:EAX.
add ebx, eax ;ADD RESULT TO BX.
;INCREASE MULTIPLE OF 10 (1, 10, 100...).
mov eax, ebp
mov ebp, 10
mul ebp ;AX*10 = EDX:EAX.
mov ebp, eax ;NEW MULTIPLE OF 10.
;CHECK IF WE HAVE FINISHED.
dec si ;NEXT DIGIT TO PROCESS.
loop repeat ;CX-1, IF NOT ZERO, REPEAT.
ret
string2number endp
;------------------------------------------
;FILLS VARIABLE STR WITH '$'.
;USED BEFORE CONVERT NUMBERS TO STRING, BECAUSE
;THE STRING WILL BE DISPLAYED.
dollars proc
mov si, offset buf
mov cx, 11
six_dollars:
mov bl, '$'
mov [ si ], bl
inc si
loop six_dollars
ret
dollars endp
;------------------------------------------
;NUMBER TO CONVERT MUST ENTER IN EAX.
;ALGORITHM : EXTRACT DIGITS ONE BY ONE, STORE
;THEM IN STACK, THEN EXTRACT THEM IN REVERSE
;ORDER TO CONSTRUCT STRING (BUF).
number2string proc
mov ebx, 10 ;DIGITS ARE EXTRACTED DIVIDING BY 10.
mov cx, 0 ;COUNTER FOR EXTRACTED DIGITS.
cycle1:
mov edx, 0 ;NECESSARY TO DIVIDE BY EBX.
div ebx ;EDX:EAX / 10 = EAX:QUOTIENT EDX:REMAINDER.
push dx ;PRESERVE DIGIT EXTRACTED (DL) FOR LATER.
inc cx ;INCREASE COUNTER FOR EVERY DIGIT EXTRACTED.
cmp eax, 0 ;IF NUMBER IS
jne cycle1 ;NOT ZERO, LOOP.
;NOW RETRIEVE PUSHED DIGITS.
mov si, offset buf
cycle2:
pop dx
add dl, 48 ;CONVERT DIGIT TO CHARACTER.
mov [ si ], dl
inc si
loop cycle2
ret
number2string endp
end start
不要链接到您的代码-将其放在您的问题中(作为文本)。我对x86指令不太了解,无法回答,但基本上您希望计算
eax>4
。你需要一个二级reigster来完成这项工作。这很简单,ror al,4
如果你提到你正在处理的汇编程序和编译器类型,你会得到更好的答案:8086、mips、arm、Visual Studio内联等等。