A programmer passes seven parameters to a function in ARM but notices incorrect values for the last three parameters inside the function. What is the most likely cause?

medium📝 Analysis Q14 of 15

ARM Architecture - Subroutines and Stack

ARegisters r4 to r6 should be used for last three parameters

BAll parameters must be passed in registers; stack is never used

CParameters beyond four are ignored by ARM

DOnly first four parameters are passed in registers; last three must be on stack but were not

Step-by-Step Solution

Solution:

Step 1: Recall ARM parameter passing rules
Only the first four parameters are passed in registers r0 to r3.
Step 2: Identify cause of incorrect values
If last three parameters are not placed on the stack properly, their values will be incorrect inside the function.
Final Answer:
Only first four parameters are passed in registers; last three must be on stack but were not -> Option D
Quick Check:
Extra params must be on stack [OK]

Quick Trick: Extra params need stack space; missing stack causes errors [OK]

Common Mistakes:

Assuming all params fit in registers
Using wrong registers for extra params
Ignoring stack for extra parameters

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More ARM Architecture Quizzes

A programmer passes seven parameters to a function in ARM but notices incorrect values for the last three parameters inside the function. What is the most likely cause?

Step 1: Recall ARM parameter passing rules

Step 2: Identify cause of incorrect values

Final Answer:

Quick Check:

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