Bird
0
0

What is wrong with this code snippet?

medium📝 Analysis Q7 of 15
ARM Architecture - Exception and Interrupt Model
What is wrong with this code snippet?
CPSID
CPSIE i
ACPSID missing interrupt type operand
BCPSIE i disables interrupts
CCPSID cannot be used before CPSIE
DNo error, code is correct
Step-by-Step Solution
Solution:

  1. Step 1: Check CPSID syntax

    CPSID requires an operand 'i' or 'f' to specify which interrupts to disable.

  2. Step 2: Identify missing operand

    Here, CPSID is missing the operand.

  3. Final Answer:

    CPSID missing interrupt type operand -> Option A

  4. Quick Check:

    CPSID must specify interrupt type [OK]
Quick Trick: Always specify 'i' or 'f' with CPSID [OK]
Common Mistakes:
  • Omitting operand
  • Assuming default operand
  • Misunderstanding instruction order

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions
More ARM Architecture Quizzes
Bus Architecture - DMA controller on bus - Quiz 12easy Control Flow Instructions - Branch and link (BL) for subroutines - Quiz 1easy Exception and Interrupt Model - Exception entry and exit sequence - Quiz 1easy Power Modes - Sleep mode (WFI instruction) - Quiz 9hard Power Modes - Sleep mode (WFI instruction) - Quiz 5medium Subroutines and Stack - Why subroutines enable modular assembly code - Quiz 1easy Subroutines and Stack - Subroutine call convention (AAPCS) - Quiz 8hard Subroutines and Stack - Recursive function in assembly - Quiz 14medium Subroutines and Stack - Preserving callee-saved registers - Quiz 6medium Subroutines and Stack - Recursive function in assembly - Quiz 2easy