ASSEMBLY LANGUAGE X86 VISUAL STUDIOS WAP a program that calculates how much memo

Question

ASSEMBLY LANGUAGE X86 VISUAL STUDIOS

WAP a program that calculates how much memory(in BYTES) is being used by the variables that we’ve initialize in the following data section.

.data

myVar BYTE 10h

myVar1 QWORD 1000000011

myarr1 WORD 1,2, 66 Dup(0)

myString BYTE ‘onetwothreefourfivesix’

myCounter DWORD 100

then WRITE a program that does the same task every 15 minutes. Assume that you have a function CURTIME already prepared for you. If you call CURTIME it will load the current time as HH:MM:SS in BL:DH:DL register

Explanation / Answer

Answer:

Each Byte= 1 Byte

Each Qword= 8 Byte

Each Word= 2 Byte

Each Dword= 4 Byte

In order to find and print the value of the bytes allocated to each variable we can use the following codes

section.text

global_start

_start:

mov edx,length

mov ecx,var

mov ebx,1

mov eax,4

int 0x80

section.data

var db 'onetwothreefourfivesix'

length equ $ -var

In the above we have shown how to find the memory(in bytes) allocated for a string. We can define any variable type in the data section to find the memory bytes allocated to it.Here we use

length equ $ -var

The logic is that $ denotes current address and $ -var denotes the next address where the machine language code will be executed. Hence length equ $ -var calculates the number of memory location in bytes between the definition of length and the label var.

The code snippet defined above should be within a procedure and the procedure should be called every 15 minutes.

We can use the current time function to define a one minute delay counter. Each time a one minute delay is registered the counter cx will be incremented by 1. In this fashion each time the counter value is increased to 15(ie 15 mins) then the procedure to calculate the byte sizes will be called.

L 2 Xor cx,cx

L1 nop

               Call ONEMINUTE_DELAY

               Inc cx

              cmp cx,15

               jle L1

               CALL PROCEDURE

Loop L2

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