MICROASM

What is the purpose of a system call in assembly language?

• To define variables

• To interact with the operating system

• To compile the program

• To display an error message

Which instruction is commonly used to invoke a system call in 32-bit Linux Assembly?

• call os

• sys_call

• int 0x80

• jmp kernel

In x86 Assembly, what is placed in the EAX register before int 0x80?

• Memory address of data

• System call number

• Error code

• File name

Which register is used to pass the first argument of a system call (like file descriptor in sys_write)?

• EAX

• ECX

• EDX

• EBX

What does the following instruction do? mov eax, 1

• Assigns 1 to the AX register

• Prepares to call sys_exit

• Prints number 1

• Calls interrupt handler 1

What is the correct way to define a constant value in assembly?

• const num = 5

• num: .equ 5

• num db 5

• define num 5

Which of the following declares a byte-sized variable in NASM?

• db 10

• dw 10

• dd 10

• resb 10

What is the size of a word in 8086 Assembly?

• 8 bits

• 12 bits

• 16 bits

• 32 bits

What does mov ecx, msg do in a system call setup?

• Stores a constant

• Loads a number into ECX

• Passes the pointer to the message string

• Ends the program

In NASM, what does resb 10 do?

• Reserves 10 registers

• Resets 10 bytes to 0

• Reserves 10 bytes in memory

• Resets ECX register