Implement a matrix multiplication algorithm in ARMv$8$ assembly language. The goal is to enhance your understanding of ARMv$8$ instruction set architecture and optimize performance.

Specifications:

Create a program that multiplies two square matrices $($NxN$).$

Allow the user to input the size of the matrices $($N$)$ and the matrix elements.

Implement the matrix multiplication using ARMv$8$ assembly language.

Display the resulting matrix.

Requirements:

Use the stack for local variables and function calls.

Utilize appropriate ARMv$8$ instructions for efficient matrix multiplication.

Handle potential edge cases, such as matrix size validation.

Deliverables:

Commented assembly code for each question.

A readme file that describes how to assemble, execute, and test the assembly code.