Ch 05: Subroutines and Stack Architecture

Examines stack memory allocation, downward growth of the stack, return address pushing, caller vs callee register preservation, and avoiding stack misalignment bugs.

222 Questions222 MCQs0 Short Questions0 Long Questions

🎯 Exam Practice Papers

CS401 - Computer Architecture and Assembly Language Programming Examination Practice

Timed practice exam simulation for CS401 - Computer Architecture and Assembly Language Programming.

Showing 71 – 80 of 222 Questions

Page 8 of 23

Q71

❓ MCQ📘 CS401📑 Lec 5🏷️ 5.1. Subroutines and Stack (Stack Overflow Condition)Easy🔁⭐💡📄🎓VU🏛️VU

When the stack becomes completely filled with data such that `SP` decrements down to 0 and wraps around, corrupting existing data, this condition is known as stack __________.

A.Overflow
B.Leakage
C.Error
D.Pointer

Q72

❓ MCQ📘 CS401📑 Lec 5🏷️ 5.1. Subroutines and Stack (POP Instruction Mechanics)Easy🔁⭐💡📄🎓VU🏛️VU

The `POP` instruction copies the word from the top of the stack (`[SS:SP]`) into its specified __________ and then increments the Stack Pointer (`SP`) by 2.

💻 assembly Snippet

pop ax ; Copies [SS:SP] into destination register AX, then SP = SP + 2

A.destination operand (register or memory)
B.source operand
C.instruction pointer
D.flag register

Q73

❓ MCQ📘 CS401📑 Lec 5🏷️ 5.1. Subroutines and Stack (PUSH Instruction Operation Mechanics)Easy🔁⭐💡📄🎓VU🏛️VU

Which x86 instruction decrements the Stack Pointer (`SP`) by 2 and then transfers a 16-bit word from the source operand onto the top of the stack?

💻 assembly Snippet

push ax ; Decrements SP by 2, then copies AX to [SS:SP]

A.PUSH
B.POP
C.CALL
D.RET

Q74

❓ MCQ📘 CS401📑 Lec 5🏷️ 5.1. Subroutines and Stack (POP Instruction Stack Pointer Increment)Easy🔁⭐💡📄🎓VU🏛️VU

The `POP` instruction transfers the word at the top of the stack (pointed to by `SS:SP`) into the destination operand and then __________ `SP` by two to point to the new top of stack.

💻 assembly Snippet

pop ax ; Copies [SS:SP] to AX, then increments SP by 2

A.increments
B.decrements
C.++
D.--

Q75

❓ MCQ📘 CS401📑 Lec 5🏷️ 5.1. Subroutines and Stack (Register Preservation via PUSH and POP)Easy🔁⭐💡📄🎓VU🏛️VU

To preserve register values across subroutine calls, the standard programming convention is to use __________ operations to save caller register values prior to subroutine execution and restore them upon return.

💻 assembly Snippet

my_func:
  push ax ; Save register state
  push bx
  ; ... subroutine body ...
  pop  bx ; Restore register state
  pop  ax
  ret

A.POP, ADC
B.CALL, RET
C.CALL, RET n
D.PUSH, POP

Q76

❓ MCQ📘 CS401📑 Lec 5🏷️ 5.1. Subroutines and Stack (Retrieving Stack Arguments via POP)Easy🔁⭐💡📄🎓VU🏛️VU

To access subroutine arguments passed on the stack, an immediate (though destructive) method is to __________ them off the stack into general registers.

💻 assembly Snippet

pop ax ; Retrieves top argument from stack

A.PUSH
B.POP
C.CALL
D.Register

Q77

❓ MCQ📘 CS401📑 Lec 5🏷️ 5.1. Subroutines and Stack (Standard Stack Frame Prologue push bp)Easy🔁⭐💡📄🎓VU🏛️VU

In standard x86 subroutine stack frame initialization, what is accomplished by executing the instruction `push bp`?

💻 assembly Snippet

push bp ; Saves caller's BP on stack
mov bp, sp ; Sets up new stack frame pointer

A.sending bp copy to stack
B.making bp copy from stack
C.pushing bp on the stack
D.doing nothing

Q78

❓ MCQ📘 CS401📑 Lec 5🏷️ 5.1. Subroutines and Stack (Local Variable Scope and Allocation)Easy🔁⭐💡📄🎓VU🏛️VU

Local variables in assembly language programming are defined as temporary variables whose scope and lifetime are restricted to the __________.

💻 assembly Snippet

push bp
mov bp, sp
sub sp, 4 ; Allocates space for local variables on stack

A.Subroutine
B.Program
C.CALL
D.Label

Q79

❓ MCQ📘 CS401📑 Lec 5🏷️ 5.1. Subroutines and Stack (RET Subroutine Return Execution)Easy🔁⭐💡📄🎓VU🏛️VU

When the __________ instruction is encountered in a subroutine, program execution is transferred back to the instruction immediately following the `CALL` instruction.

💻 assembly Snippet

ret ; Pops return address from stack into IP

A.CALL
B.RET
C.AND
D.XOR

Q80

❓ MCQ📘 CS401📑 Lec 5🏷️ 5.1. Subroutines and Stack (POP Instruction Operand)Easy🔁⭐💡📄🎓VU🏛️VU

The `POP` operation reads a word from the top of the stack (`[SS:SP]`) and copies it into its __________.

💻 assembly Snippet

pop ax ; Copies top of stack to destination register operand AX

A.Register
B.operand
C.RET n
D.Pointer

Ch 05: Subroutines and Stack Architecture

CS401 - Computer Architecture and Assembly Language Programming Examination Practice

Mid Term Examination

Final Term Examination

CS401 - Computer Architecture and Assembly Language Programming Examination Practice

Mid Term Examination

Final Term Examination

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