Vector table structure in ARM Architecture - Mini Project: Build & Apply

Understanding Vector Table Structure in ARM Architecture

📖 Scenario: You are learning about how ARM processors handle interrupts and exceptions. The vector table is a key part of this process. It is a table of addresses that the processor uses to find the code to run when an interrupt or exception occurs.Imagine the vector table as a list of emergency phone numbers. Each number corresponds to a specific emergency type. When an emergency happens, you look up the right number and call it.

🎯 Goal: Build a simple representation of the ARM vector table structure. You will create a list of vector entries with their exact addresses and names. Then, you will add a configuration variable for the base address of the vector table. Next, you will write code to access the vector table entries. Finally, you will complete the structure by adding the total number of vectors.

📋 What You'll Learn

Create a list called vector_table with exact vector names and addresses

Add a variable base_address with the exact value 0x00000000

Use a loop to create a dictionary vectors mapping vector names to their addresses

Add a variable vector_count with the exact number of vectors in the table

💡 Why This Matters

🌍 Real World

Understanding the vector table structure helps in embedded systems programming and debugging ARM-based microcontrollers and processors.

💼 Career

Knowledge of vector tables is essential for firmware developers, embedded systems engineers, and anyone working with low-level ARM architecture programming.

1

Create the vector table list

Create a list called vector_table with these exact tuples: ("Reset", 0x00000000), ("Undefined Instruction", 0x00000004), ("Software Interrupt", 0x00000008), ("Prefetch Abort", 0x0000000C), ("Data Abort", 0x00000010), ("Reserved", 0x00000014), ("IRQ", 0x00000018), ("FIQ", 0x0000001C)

ARM Architecture

# Create the vector_table list with exact vector names and addresses
# Your code here

Need a hint?

Use a Python list with tuples. Each tuple has the vector name as a string and the address as a hex number.

2

Add the base address variable

Add a variable called base_address and set it to the exact value 0x00000000

ARM Architecture

vector_table = [
    ("Reset", 0x00000000),
    ("Undefined Instruction", 0x00000004),
    ("Software Interrupt", 0x00000008),
    ("Prefetch Abort", 0x0000000C),
    ("Data Abort", 0x00000010),
    ("Reserved", 0x00000014),
    ("IRQ", 0x00000018),
    ("FIQ", 0x0000001C)
]

# Add the base_address variable here
# Your code here

Need a hint?

Use a simple variable assignment with the exact hex value.

3

Create a dictionary mapping vector names to addresses

Use a for loop with variables name and address to iterate over vector_table. Inside the loop, add entries to a dictionary called vectors that maps each name to its address

ARM Architecture

vector_table = [
    ("Reset", 0x00000000),
    ("Undefined Instruction", 0x00000004),
    ("Software Interrupt", 0x00000008),
    ("Prefetch Abort", 0x0000000C),
    ("Data Abort", 0x00000010),
    ("Reserved", 0x00000014),
    ("IRQ", 0x00000018),
    ("FIQ", 0x0000001C)
]

base_address = 0x00000000

# Create the vectors dictionary using a for loop
# Your code here

Need a hint?

Start with an empty dictionary. Use a for loop to add each vector name and address.

4

Add the vector count variable

Add a variable called vector_count and set it to the exact length of vector_table using the len() function

ARM Architecture

vector_table = [
    ("Reset", 0x00000000),
    ("Undefined Instruction", 0x00000004),
    ("Software Interrupt", 0x00000008),
    ("Prefetch Abort", 0x0000000C),
    ("Data Abort", 0x00000010),
    ("Reserved", 0x00000014),
    ("IRQ", 0x00000018),
    ("FIQ", 0x0000001C)
]

base_address = 0x00000000

vectors = {}
for name, address in vector_table:
    vectors[name] = address

# Add the vector_count variable here
# Your code here

Need a hint?

Use the len() function to get the number of vectors in the list.