CS401 ASSIGNMENT NO. 1 SPRING 2023 || 100% RIGHT SOLUTION || ASSEMBLY LANGUAGE PROGRAMMING || BY VuTech
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QUESTION-1
Write an assembly language program to store your Roll Number(Number part only) and calculate their sum.
ANSWER:
; Program to store roll numbers and calculate their sum
section .data
roll_numbers db 10, 20, 30, 40, 50 ; Example roll numbers (number part only)
num_rolls equ $ - roll_numbers ; Number of roll numbers
sum db 0 ; Variable to store the sum
section .text
global _start
_start:
mov ecx, num_rolls ; Counter for loop
mov esi, roll_numbers ; Pointer to roll_numbers array
xor eax, eax ; Clear eax register for sum calculation
loop_start:
mov al, [esi] ; Load the current roll number
add [sum], al ; Add the roll number to the sum
inc esi ; Move to the next roll number
loop loop_start ; Continue loop until ecx becomes zero
; Print the sum
mov eax, 4 ; System call number for write
mov ebx, 1 ; File descriptor for stdout
mov ecx, sum ; Address of the sum variable
mov edx, 1 ; Number of bytes to write
int 0x80 ; Call the kernel
; Exit the program
mov eax, 1 ; System call number for exit
xor ebx, ebx ; Exit status
int 0x80 ; Call the kernel
QUESTION-2
Find the offset address where Physical address is 4A37Bh and the segment address is 40FFh.
SOLUTION:
To find the offset address given a physical address and a segment address, you need to perform a calculation using the following formula:
Offset Address = (Segment Address × 16) + Physical Address
In this case, the segment address is 40FFh and the physical address is 4A37Bh. Let's plug in these values into the formula:
Offset Address = (40FFh × 16) + 4A37Bh
To perform the calculation, we need to convert the hexadecimal values to decimal values:
Segment Address = 40FFh = 16639 (in decimal)
Physical Address = 4A37Bh = 304123 (in decimal)
Now, substitute these values into the formula:
Offset Address = (16639 × 16) + 304123
Calculating the values:
Offset Address = 266224 + 304123
Offset Address = 570347
Therefore, the offset address corresponding to a physical address of 4A37Bh and a segment address of 40FFh is 570347.