ARM Architecture - Subroutines and Stack
Which registers are typically considered callee-saved in ARM architecture?
Which registers are typically considered callee-saved in ARM architecture?
easy📝 Conceptual Q2 of 15
Step-by-Step Solution
Solution:
Step 1: Identify callee-saved registers in ARM
Registers r4 to r11 are designated as callee-saved, meaning the called function must preserve them.Step 2: Differentiate from caller-saved registers
Registers r0 to r3 are caller-saved, used for passing arguments and temporary data.Final Answer:
r4 to r11 -> Option BQuick Check:
Callee-saved registers = r4-r11 [OK]
Quick Trick: Remember: r4-r11 are callee-saved, r0-r3 caller-saved [OK]
Common Mistakes:
- Confusing caller-saved with callee-saved registers
- Including special registers like r13 (stack pointer)
- Assuming r12 or r14 are callee-saved
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