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During exception exit in ARM, what is restored first to resume normal execution?

easy📝 Conceptual Q2 of 15
ARM Architecture - Exception and Interrupt Model
During exception exit in ARM, what is restored first to resume normal execution?
ASaved Program Status Register (SPSR)
BProgram Counter (PC)
CGeneral-purpose registers
DStack Pointer (SP)
Step-by-Step Solution
Solution:

  1. Step 1: Identify what controls processor state

    The SPSR holds the saved status before exception.

  2. Step 2: Understand exit sequence order

    Restoring SPSR first sets the processor back to the original mode and state.

  3. Final Answer:

    Saved Program Status Register (SPSR) -> Option A

  4. Quick Check:

    Exception exit restores SPSR first [OK]
Quick Trick: Restore SPSR first to reset processor state [OK]
Common Mistakes:
  • Restoring PC before SPSR
  • Restoring general registers first
  • Confusing SP with SPSR

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