Developed a security-focused ARM64 thread-based stack unwinding feature for the renesas/zephyr repository, enhancing kernel stability and reliability of unwind operations. The implementation aligned with the arch_stack_walk() API, incorporating stack bounds validation through stack_info and TLS pointers, and providing a robust fallback to is_address_mapped() when necessary. By defaulting to the _current thread when the target was NULL, the solution ensured consistent unwinding behavior. This work leveraged expertise in C programming, embedded systems, and kernel development, addressing the need for secure and reliable stack unwinding on ARM64 architectures while maintaining compliance with established kernel APIs and best practices.