Bird
0
0

How does the ARM exception exit sequence ensure the processor returns to the exact state before the exception?

hard📝 Application Q8 of 15
ARM Architecture - Exception and Interrupt Model
How does the ARM exception exit sequence ensure the processor returns to the exact state before the exception?
ABy jumping directly to the exception handler
BBy resetting all registers to zero
CBy restoring SPSR first, then restoring PC from LR
DBy saving the current PC to LR during exit
Step-by-Step Solution
Solution:

  1. Step 1: Understand restoring processor state

    Restoring SPSR resets processor mode and flags.

  2. Step 2: Restore PC from LR to resume execution

    PC is restored from LR to continue where exception occurred.

  3. Final Answer:

    By restoring SPSR first, then restoring PC from LR -> Option C

  4. Quick Check:

    Exit restores SPSR then PC to resume state [OK]
Quick Trick: Restore SPSR then PC to resume pre-exception state [OK]
Common Mistakes:
  • Resetting registers instead of restoring
  • Jumping to handler instead of returning
  • Saving PC to LR during exit (wrong direction)

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions
More ARM Architecture Quizzes
Bus Architecture - AHB and APB bus overview - Quiz 13medium Bus Architecture - AHB and APB bus overview - Quiz 9hard Bus Architecture - Bus matrix for multi-master access - Quiz 8hard Control Flow Instructions - Conditional branch with flags - Quiz 9hard Control Flow Instructions - Branch and link (BL) for subroutines - Quiz 11easy Exception and Interrupt Model - Why exceptions handle hardware events - Quiz 5medium Exception and Interrupt Model - Vector table structure - Quiz 3easy Subroutines and Stack - Why subroutines enable modular assembly code - Quiz 4medium Subroutines and Stack - Recursive function in assembly - Quiz 5medium Subroutines and Stack - Nested subroutine calls - Quiz 12easy