Module #5 Study Deck

Question 1

PUSHF is used to preserve all general purpose register contents on the stack.
True / False

Answer 1

False

Question 2

What will be the value of EAX when the following sequence of instructions has executed?

PUSH 5
PUSH 10
PUSH 20
POP EAX

Answer 2

20

Question 3

ESP always points to ______
* the next, empty, location above the stack.
* the next, empty, location below the stack.
* the last value to be added to, or pushed on, the top of stack.
* the beginning of the stack when your program first began.

Answer 3

the last value to be added to, or pushed on, the top of stack.

Question 4

In the IA32 architecture, the top item on the stack will always have a lower memory address than the bottom item.
True / False

Answer 4

True

Question 5

In the IA32 architecture, ESP (the stack pointer) is incremented each time data is popped from the stack.
True / False

Answer 5

True

Question 6

What instruction (with any necessary operands) would pop the top 32 bits of the runtime stack into the EBP register?

Answer 6

POP EBP

Question 7

Which of the following instructions always modify the ESP register? (Check all that apply)
* POP
* INC
* DEC
* PUSH
* JNE
* RET
* CALL
* JMP

Answer 7

• PUSH
• POP
• RET
• CALL

Question 8

The RET instruction pops the top of the stack into what register?
* EIP
* EBP
* ESP
* It does not pop the top of the stack into a register.

Answer 8

EIP

Question 9

The CALL instruction functions similarly to which of the following?
* Jump
* Jump, then Push
* Push, then Jump
* Move, then Jump

Answer 9

• Push, then Jump

Question 10

A/An ________ procedure call occurs when a called procedure calls another procedure before the first procedure returns.
* cointained
* little
* inner
* nested

Answer 10

• nested

Question 11

A subprocedure’s stack frame contains the return address and its local variables.
True / False

Answer 11

True

Question 12

A stack frame is _____
* The area of the text segment set aside for passed arguments, subroutine return address, local variables, and saved registers
* The area of the stack set aside for storing global strings.
* The area of the stack set aside for passed arguments, return address, local variables, and saved registers.
* An area in the heap that is used to store global variables
* A register window pointing to local variables.

Answer 12

• The area of the stack set aside for passed arguments, return address, local variables, and saved registers.

Question 13

The USES operator, coupled with the PROC directive, lets you list the names of all registers modified within a procedure and preserves them automatically for you.
True / False

Answer 13

True

Question 14

Which offers a more flexible approach, passing arguments to procedures in registers, or on the stack?
* on the stack
* in registers

Answer 14

• on the stack

Question 15

What parameter-passing method do most/all of Irvine’s library procedures use?
* Shared memory
* Pass Parameters in Registers
* Pass Parameters on the Stack

Answer 15

Pass Parameters in Registers

Question 16

Arrays are passed by reference to avoid copying each element into the stack/registers.
True / False

Answer 16

True

Question 17

When values are received by a called subroutine, they are called __________.
* parameters
* return values
* arguments
* variables

Answer 17

• parameters

Question 18

An input parameter may be passed by reference.
True / False

Answer 18

True

Question 19

Values passed to a subroutine by a calling program are called __________.
* variables
* parameters
* arguments
* return values

Answer 19

• arguments

Question 20

When an argument is passed by value, a copy of the address is pushed on the stack.
* True
* False

Answer 20

False