ARM Architecture - Subroutines and Stack
In ARM calling conventions, which registers are designated to hold the first two integer parameters when a function is called?
In ARM calling conventions, which registers are designated to hold the first two integer parameters when a function is called?
easy📝 Conceptual Q1 of 15
Step-by-Step Solution
Solution:
Step 1: Identify ARM parameter registers
ARM uses registers R0 to R3 to pass the first four integer or pointer parameters.Step 2: Determine first two parameters
The first parameter is passed in R0, the second in R1.Final Answer:
R0 and R1 -> Option AQuick Check:
First two parameters in R0 and R1 [OK]
Quick Trick: First two parameters go into R0 and R1 registers [OK]
Common Mistakes:
- Assuming parameters start from R2
- Using higher registers like R4 for initial parameters
- Confusing parameter registers with return registers
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