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Which exception level in ARM architecture is typically used for system calls?

easy📝 Conceptual Q2 of 15
ARM Architecture - Exception and Interrupt Model
Which exception level in ARM architecture is typically used for system calls?
AFIQ
BSVC
CPrefetch Abort
DIRQ
Step-by-Step Solution
Solution:

  1. Step 1: Identify exception purpose

    SVC (Supervisor Call) is used to request privileged operations from user mode.

  2. Step 2: Match exception to system calls

    SVC is the standard exception for system calls in ARM.

  3. Final Answer:

    SVC -> Option B

  4. Quick Check:

    System call exception = SVC [OK]
Quick Trick: SVC triggers system calls from user mode [OK]
Common Mistakes:
  • Choosing IRQ for system calls
  • Confusing Prefetch Abort with system calls
  • Assuming FIQ handles system calls

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