implicitly dependent upon any previous instruction that generates an exception. Exceptions are caused whenever an instruction cannot be properly completed, and are usually due to either an untranslated virtual address or an erroneous operand.
The processor design implements precise exceptions, by:
- identifying the instruction which caused the exception
- preventing the exception-causing instruction from graduating
- aborting all subsequent instructions
Thus, all register values remain the same as if instructions were executed singly. Effectively, all previous instructions are completed, but the faulting instruction and all subsequent instructions do not modify any values.
Copyright 1996, 1997, MIPS Technologies, Inc. -- 09 DEC 96
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