ARM Architecture - Subroutines and Stack
In ARM architecture, which registers are primarily used to pass the first four function parameters?
In ARM architecture, which registers are primarily used to pass the first four function parameters?
easy📝 Conceptual Q11 of 15
Step-by-Step Solution
Solution:
Step 1: Understand ARM calling convention basics
ARM uses registers r0 to r3 to pass the first four parameters to functions for speed.Step 2: Identify correct register range
Registers r0, r1, r2, and r3 are used, not the higher registers.Final Answer:
r0 to r3 -> Option CQuick Check:
First four parameters = r0 to r3 [OK]
Quick Trick: Remember first four params go in r0-r3 registers [OK]
Common Mistakes:
- Confusing r4-r7 as parameter registers
- Thinking all parameters fit in registers
- Assuming stack is always used for parameters
Master "Subroutines and Stack" in ARM Architecture
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