Exception

Software interrupt, Synchronous interrupt

• Programming errors
• Segmentation fault
• division by 0

• Anomalous conditions that must be handled by kernel
• page fault
• floating-point error

• Debugger

1. Save the contents of most registers in the Kernel Mode stack

2. Handle the exception

3. Exit from the handler from ret_from_exception()

Why I Prefer Exceptions to Error Values

Exceptions are often a better way to handle errors than returning them as values. We argue that traditional exceptions provide better user and developer experience, and show that they even result in faster execution.

https://cedardb.com/blog/exceptions_vs_errors/