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A developer wrote an ARM exception handler but forgot to disable interrupts inside it. What issue might arise?

medium📝 Analysis Q7 of 15
ARM Architecture - Exception and Interrupt Model
A developer wrote an ARM exception handler but forgot to disable interrupts inside it. What issue might arise?
AThe processor will ignore all interrupts
BNested interrupts could cause stack overflow or corruption
CThe handler will never be called
DThe processor will run faster
Step-by-Step Solution
Solution:

  1. Step 1: Understand interrupt disabling in handlers

    Disabling interrupts prevents new interrupts from interrupting the current handler.

  2. Step 2: Consequence of not disabling interrupts

    Without disabling, interrupts can nest, causing stack overflow or data corruption.

  3. Final Answer:

    Nested interrupts could cause stack overflow or corruption -> Option B

  4. Quick Check:

    Not disabling interrupts = nested interrupt problems [OK]
Quick Trick: Disable interrupts inside handler to avoid nesting [OK]
Common Mistakes:
  • Assuming interrupts are ignored
  • Thinking handler won't be called
  • Believing processor speeds up

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