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How are eight integer parameters passed to a function in ARM architecture according to the standard calling convention?

easy📝 Factual Q3 of 15
ARM Architecture - Subroutines and Stack
How are eight integer parameters passed to a function in ARM architecture according to the standard calling convention?
AAll eight in R0-R7
BFirst four in R0-R3, remaining four on the stack
CFirst six in R0-R5, last two on the stack
DAll eight passed on the stack
Step-by-Step Solution
Solution:

  1. Step 1: Understand ARM parameter passing

    ARM passes up to four parameters in registers R0 to R3.

  2. Step 2: Parameters beyond four go to stack

    Any additional parameters beyond four are passed on the stack in order.

  3. Final Answer:

    First four in R0-R3, remaining four on the stack -> Option B

  4. Quick Check:

    Registers R0-R3 for first four, stack for rest [OK]
Quick Trick: Only first four parameters use registers R0-R3 [OK]
Common Mistakes:
  • Assuming more than four parameters fit in registers
  • Passing all parameters on stack unnecessarily
  • Mixing up register and stack order

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