Stack frame setup in ARM Architecture - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a stack frame in ARM architecture?

A stack frame is a section of the stack that holds data for a single function call, including local variables, return address, and saved registers.

beginner

Why do ARM functions set up a stack frame?

To organize local data and save the return address and registers so the function can return correctly and maintain data integrity.

intermediate

Which register typically points to the start of the stack frame in ARM?

The frame pointer register (usually R7 or FP) points to the base of the current stack frame.

intermediate

What is the first step in setting up a stack frame in ARM assembly?

The first step is to push the previous frame pointer and the link register (LR) onto the stack to save them.

beginner

How does the stack grow in ARM architecture during stack frame setup?

The stack grows downward, meaning the stack pointer decreases as data is pushed onto the stack.

What does the stack frame store during a function call in ARM?

A Local variables, return address, and saved registers

B Only the return address

C Only global variables

D Only the function parameters

The stack frame stores local variables, the return address, and saved registers to maintain function state.

Which register usually holds the frame pointer in ARM stack frame setup?

A LR (Link Register)

B R0

C R7

D SP (Stack Pointer)

R7 is commonly used as the frame pointer to mark the base of the current stack frame.

During stack frame setup, what happens to the stack pointer (SP)?

A It decreases as data is pushed onto the stack

B It increases as data is pushed onto the stack

C It stays the same

D It points to the heap

The stack grows downward in ARM, so the stack pointer decreases when data is pushed.

What is the purpose of saving the link register (LR) during stack frame setup?

A To hold function parameters

B To save the return address for the function

C To store local variables

D To point to the stack base

The link register holds the return address, so saving it preserves where to return after the function ends.

Which of the following is NOT typically stored in a stack frame?

A Saved registers

B Local variables

C Return address

D Global variables

Global variables are stored in a fixed memory area, not in the stack frame.

Explain the steps involved in setting up a stack frame in ARM architecture.

Think about what needs to be saved and how the stack pointer moves.

Describe why the stack grows downward in ARM and how this affects stack frame setup.

Consider the direction of stack growth and its practical reasons.