ARM Architecture - Subroutines and Stack
When passing 12 integer parameters to a function in ARM, how should the parameters be arranged according to the ARM calling convention?
When passing 12 integer parameters to a function in ARM, how should the parameters be arranged according to the ARM calling convention?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: ARM register parameter limit
ARM uses registers R0 to R3 for the first four parameters only.Step 2: Parameters beyond four go on stack
Parameters 5 through 12 are passed on the stack in order.Final Answer:
First four in R0-R3, remaining eight pushed onto the stack -> Option CQuick Check:
Only four registers used, rest on stack [OK]
Quick Trick: Only four registers used; rest parameters go on stack [OK]
Common Mistakes:
- Assuming more than four parameters fit in registers
- Passing all parameters on stack unnecessarily
- Incorrectly splitting parameters between registers and stack
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