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Why is it necessary to adjust the stack pointer (SP) at the beginning of a function in ARM architecture?

easy📝 Conceptual Q1 of 15
ARM Architecture - Subroutines and Stack
Why is it necessary to adjust the stack pointer (SP) at the beginning of a function in ARM architecture?
ATo allocate space for local variables and save registers
BTo clear the stack memory
CTo reset the program counter
DTo initialize the link register
Step-by-Step Solution
Solution:

  1. Step 1: Understand stack pointer role

    The SP points to the top of the stack, which grows downward in ARM.

  2. Step 2: Function prologue purpose

    Adjusting SP reserves space for local variables and saved registers.

  3. Final Answer:

    To allocate space for local variables and save registers -> Option A

  4. Quick Check:

    SP adjustment allocates stack space [OK]
Quick Trick: SP adjustment reserves stack space [OK]
Common Mistakes:
  • Thinking SP clears memory
  • Confusing SP with PC or LR
  • Assuming SP reset initializes registers

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