Interrupts and Traps

Interrupt, Trap, Abort, System Call, Breakpoint, ...
All of these are basically the same:
Normal program execution is interrupted,
Interrupts are disabled and CPU state changes
Execution resumes at a differerent location
You need some special instruction to "return"

Usually, we call "Interrupt Request" (IRQ) something external
A device driver requires attention
A timer expired
A network or USB frame arrived

And we call "Trap" sth that depends on the program flow
Illegal Instruction
Division by zero
Illegal pointer

Software interrupts are just the same
Special instructions that force a state change in the CPU