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You need to write a subroutine that takes six integer arguments following AAPCS. How are the arguments passed to the subroutine?

hard📝 Application Q8 of 15
ARM Architecture - Subroutines and Stack
You need to write a subroutine that takes six integer arguments following AAPCS. How are the arguments passed to the subroutine?
AFirst two in R0-R1, rest in R2-R5
BAll six in R0-R5 registers
CFirst four in R0-R3, remaining two on stack
DAll six pushed on stack
Step-by-Step Solution
Solution:

  1. Step 1: Recall argument passing rules in AAPCS

    First four arguments are passed in registers R0 to R3.

  2. Step 2: Understand handling of extra arguments

    Arguments beyond four are passed on the stack in order.

  3. Final Answer:

    First four in R0-R3, remaining two on stack -> Option C

  4. Quick Check:

    Args >4 go on stack [OK]
Quick Trick: Pass first 4 args in R0-R3, extras on stack [OK]
Common Mistakes:
  • Passing all args in registers
  • Passing all args on stack
  • Incorrect register assignment

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