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Which ARM register is typically used to pass the first argument to a recursive function?

easy📝 Conceptual Q2 of 15
ARM Architecture - Subroutines and Stack
Which ARM register is typically used to pass the first argument to a recursive function?
AR7
BLR
CR0
DSP
Step-by-Step Solution
Solution:

  1. Step 1: Recall ARM calling conventions

    ARM uses registers R0 to R3 to pass the first four arguments to functions.

  2. Step 2: Identify first argument register

    The first argument is passed in R0, including for recursive calls.

  3. Final Answer:

    R0 -> Option C

  4. Quick Check:

    First argument register = R0 [OK]
Quick Trick: First argument always in R0 register [OK]
Common Mistakes:
  • Confusing LR (link register) with argument register
  • Using SP (stack pointer) for arguments
  • Assuming R7 is for arguments

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