Bird
0
0

Which ARM instruction is used to call a subroutine?

easy📝 Factual Q12 of 15
ARM Architecture - Subroutines and Stack
Which ARM instruction is used to call a subroutine?
ABX LR
BBL
CMOV
DADD
Step-by-Step Solution
Solution:

  1. Step 1: Identify call instruction

    In ARM, the instruction to call a subroutine is 'BL' which means Branch with Link.

  2. Step 2: Differentiate from return instruction

    'BX LR' is used to return from a subroutine, not to call it.

  3. Final Answer:

    BL -> Option B

  4. Quick Check:

    Call subroutine = BL instruction [OK]
Quick Trick: BL calls subroutine; BX LR returns [OK]
Common Mistakes:
  • Confusing BX LR as call instead of return
  • Using MOV or ADD as call instructions
  • Mixing up branch instructions without link

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions
More ARM Architecture Quizzes
Bus Architecture - Bus fault and memory protection - Quiz 6medium Bus Architecture - Peripheral clock enable - Quiz 15hard Control Flow Instructions - Loop implementation in assembly - Quiz 5medium Exception and Interrupt Model - Exception priority levels - Quiz 2easy Exception and Interrupt Model - Exception entry and exit sequence - Quiz 11easy Exception and Interrupt Model - Interrupt enable and disable - Quiz 9hard Exception and Interrupt Model - Vector table structure - Quiz 14medium Power Modes - Why power modes matter for battery devices - Quiz 7medium Subroutines and Stack - Parameter passing in registers - Quiz 10hard Subroutines and Stack - Recursive function in assembly - Quiz 10hard