A programmer notices that after an exception exit, the processor does not return to the original task but stays in exception mode. What is the most likely cause?

medium📝 Analysis Q14 of 15

ARM Architecture - Exception and Interrupt Model

AThe saved state was not restored correctly during exception exit

BThe exception entry sequence did not save the CPSR

CThe processor clock speed was changed during exception

DThe exception vector address was set incorrectly

Step-by-Step Solution

Solution:

Step 1: Analyze the problem
If the processor stays in exception mode after exit, it means it did not restore the previous mode and state.
Step 2: Identify the cause
Not restoring the saved state (including CPSR and PC) during exception exit causes the processor to remain in exception mode.
Final Answer:
The saved state was not restored correctly during exception exit -> Option A
Quick Check:
Incorrect state restore = stuck in exception mode [OK]

Quick Trick: Restore saved state fully to exit exception mode [OK]

Common Mistakes:

Blaming clock speed changes
Confusing entry saving with exit restoring
Assuming vector address affects exit mode

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More ARM Architecture Quizzes

A programmer notices that after an exception exit, the processor does not return to the original task but stays in exception mode. What is the most likely cause?

Step 1: Analyze the problem

Step 2: Identify the cause

Final Answer:

Quick Check:

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