Handling Interrupts:

Precise interrupts (sequential semantics)

• Complete instructions before the offending instructions

o   Force trap instruction into IF

o   Squash (effects of) instructions after

o   Save PC (& next PC with delayed branches)

• Must handle simultaneous interrupts

o   ID - illegal/privileged instruction

o   EX - arithmetic exception

o   IF, M - memory access ( misaligned, page fault protection)

Example: Data page fault

Posted Date: 10/13/2012 7:15:22 AM | Location : United States

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