Word:

software interrupt

software interrupt - An interrupt caused by a specific machine language operation code (e.g. the Motorola 68000's TRAP, the IBM System/390's SVC or the ARM's SWI) rather than by a hardware event.

As with a hardware interrupt, this causes the processor to store the current state, store identifying information about the particular interrupt, and pass control to a first level interrupt handler.

A trap is similar except that it is caused by an unexpected software condition or error (e.g. divide by zero, undefined instruction) rather than a deliberate instruction.
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