interrupt - Why page fault is considered as trap -

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why page fault considered trap instead of interrupt? , stages take place when try access null pointer until segmentation fault? , signal sent in situations sigill, right? thanks!

a trap exception in users-pace caused user-space program. in specific case user-space program accessed page not mapped using memory management unit (mmu) , therefore caused trap. interrupts on other hand generated external hardware events, such timer.


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