ResetHandler

ResetHandler is a term commonly used in embedded systems and operating system kernels to refer to a specific function or code segment responsible for handling system resets. When a system undergoes a reset, whether it's a power-on reset, a software reset command, or an error-induced reset, the ResetHandler is one of the first pieces of code to execute. Its primary role is to re-initialize the system hardware and software to a known, stable state.

The exact implementation of a ResetHandler varies significantly depending on the target architecture and the system's design. However, common tasks include initializing the processor's core components, setting up essential memory interfaces, configuring clock signals, and potentially clearing various internal states. It might also involve setting up the initial stack pointer and vector table, which are crucial for subsequent program execution.

In many embedded systems, the ResetHandler is often the very first entry point of the program after the bootloader, or it may be directly linked into the startup code. Its efficiency and correctness are paramount, as a faulty ResetHandler can prevent the system from booting or functioning properly. Debugging issues related to resets often involves closely examining the behavior of the ResetHandler. In more complex systems, the ResetHandler might delegate some initialization tasks to other modules or services after performing its core functions.