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write a program in x86 Processor Assembly Language that uses the variables below and only mov...

write a program in x86 Processor Assembly Language that uses the variables below and only mov instructions to copy the value from Var1 to Var2 reversing the order of the bytes.

.data

Var1 DWORD 56942145h; reversing means should become 45219456h

Var2 DWORD?

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Answer #1 
Data Segment str1 db 'String_Reverse','$' strlen1 dw $-str1 strrev db 20 dup(' ') Data Ends Code Segment Assume cs:code, ds:data Begin: mov ax, data mov ds, ax mov es, ax mov cx, strlen1 add cx, -2 lea si, str1 lea di, strrev add si, strlen1 add si, -2 L1: mov al, [si] mov [di], al dec si inc di loop L1 mov al, [si] mov [di], al inc di mov dl, '$' mov [di], dl Print: mov ah, 09h lea dx, strrev int 21h Exit: mov ax, 4c00h int 21h Code Ends End Begin
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