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A developer sets the vector table's first entry to 0x00000000 instead of the initial stack pointer. What issue will most likely occur?

medium📝 Analysis Q14 of 15
ARM Architecture - Exception and Interrupt Model
A developer sets the vector table's first entry to 0x00000000 instead of the initial stack pointer. What issue will most likely occur?
AStack pointer will be invalid causing a crash
BProcessor will reset normally
CReset handler will not execute
DInterrupts will be ignored
Step-by-Step Solution
Solution:

  1. Step 1: Understand role of first vector entry

    The first entry sets the initial stack pointer address for the processor.

  2. Step 2: Analyze effect of setting it to zero

    Setting it to 0x00000000 means the stack pointer points to an invalid memory location, causing a crash.

  3. Final Answer:

    Stack pointer will be invalid causing a crash -> Option A

  4. Quick Check:

    Invalid stack pointer = Crash [OK]
Quick Trick: First vector must be valid stack pointer [OK]
Common Mistakes:
  • Thinking reset handler won't run
  • Assuming interrupts are disabled
  • Believing processor resets normally

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