Write an assembly program that rearrange the values in the following array as 40, 30, 20,...

Write an assembly program that rearrange the values in the following array as 40, 30, 20, 10:

.data byte1 BYTE 10, 20, 30, 40

Save the original four byte data into eax, and the rearranged data into ebx, from the least significant bit to the most significant bit. Insert a call DumpRegs statement to display the register values.

Solutions

Expert Solution

instruction    source offset     result
mov bx,[bx]     1000h             1BACh
mov cx,[si]     2000h             20FEh
mov bx,[ax]     illegal source register
add [si],[di]   illegal memory-memory add
inc [di]        3000h             031Eh

Processing Arrays using Register-Indirect Mode

Sum in ax the 10-element word array W

W dw 10,20,30,40,50,60,70,80,90,10

xor ax,ax     ; ax holds sum
lea si,W      ; si points to array W
mov cx,10     ; cx has number of elements

addnos:

add ax,[si]   ; sum = sum + element
add si,2      ; move pointer to the next element
loop addnos    ; loop until done

.code
main PROC
mov ax,8000h ;ax = 8000h
mov bx,2000h ;bx = 2000h
mov cx,3000h ;cx = 3000h
sub ax,bx ;subtract bx from ax, ax = 6000h
sub ax,cx ;subtract cx from ax, ax = 3000h
sub cx,bx ;subtract bx from cx, cx = 1000h
call DumpRegs ;display registers
exit ;halt program
main ENDP ;end procedure
END main ;end program

venereology answered 3 weeks ago

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