CompSystems 245 - Week 2 - Lecture 6 - Functions and the Stack

Describe the function in C:

• How they are defined

• breakdown of their definition'

• purpose

Describe how a function call affects program flow:

• what non-branching instructions do to prgram flow

• what function calls do

• c equivalent of function calls in assembly

Describe the fetch execute cycle of a CPU when a conditional branch is used:

• first line is the branching instruction

• condition is met 3 lines after

• state how it affects performance

Describe how to call functions in ARM:

• calling a function

• returning from a function

• the process of how either works

• the keyword that helps with function calls and returns

Describe the arguments and return values of a function in ARM:

• how arguments are used

• how return values are used

• convert the c code into ARM code

Describe the function used to branch to an address stored in a register

Describe how to call a function from another function in ARM assembly:

• how the first function is called

• how the second function is called

• how the functions are returned

Describe how to implement recursive functions in ARM

Describe the convention of function calls relating to return values and arguments in ARM:

• where arguments are stored

• register of return value

• how double-word sized data is stored

• how to store more arguments

• which registers are preserved

Describe the Stack:

• its purpose

• what it is

• instructions for accessing it

• How it grows and shrinks in ARM

Describe the Stack:

• what it stores

  • 
    

Describe the stack:

• its use in storing local variables

• how data is stored on it

• location of most recent data item

Describe the stack in the memory layout of the STM32F407VGT

Describe the Stack pointer:

• what it does

• where it starts in memory

• direction of growth in memory

• when increm

Describe how the Stack operates in the STM32F407VGT microcontroller:

• Processor used

• architecture used

• what pushing data does

• what popping data does

• location of base address in Stack

For the following C code:

• Write the equivalent ARM code that doesn’t violate rules

Describe how to load/store multiple registers to the stack at once:

• The operations used

• how to decrement/increment before or after