ARM Architecture - Exception and Interrupt Model
Why might an interrupt not be handled correctly if the vector table is not properly relocated after boot?
Why might an interrupt not be handled correctly if the vector table is not properly relocated after boot?
medium📝 Analysis Q7 of 15
Step-by-Step Solution
Solution:
Step 1: Understand vector table relocation
If the vector table is not relocated properly, the processor may read invalid addresses for handlers.Step 2: Consequence of wrong addresses
Wrong handler addresses cause the processor to jump to invalid code, leading to faults or no interrupt handling.Final Answer:
Processor reads wrong handler addresses causing faults -> Option BQuick Check:
Incorrect vector base = wrong handler addresses [OK]
Quick Trick: Wrong vector base causes invalid handler jumps [OK]
Common Mistakes:
- Blaming stack pointer for interrupt failures
- Confusing clock settings with vector table
- Assuming memory allocation affects interrupts
Master "Exception and Interrupt Model" in ARM Architecture
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