Intel Core 2 Duo U7600 U7600 User Manual

Product codes

U7600

Errata

Specification Update

AZ56.

Code Segment Limit/Canonical Faults on RSM May be Serviced before

Higher Priority Interrupts/Exceptions and May Push the Wrong

Address Onto the Stack

Problem:

Normally, when the processor encounters a Segment Limit or Canonical Fault due to

code execution, a #GP (General Protection Exception) fault is generated after all

higher priority Interrupts and exceptions are serviced. Due to this erratum, if RSM

(Resume from System Management Mode) returns to execution flow that results in a

Code Segment Limit or Canonical Fault, the #GP fault may be serviced before a higher

priority Interrupt or Exception (e.g. NMI (Non-Maskable Interrupt), Debug

break(#DB), Machine Check (#MC), etc.). If the RSM attempts to return to a non-

canonical address, the address pushed onto the stack for this #GP fault may not

match the non-canonical address that caused the fault.

Implication: Operating systems may observe a #GP fault being serviced before higher priority

Interrupts and Exceptions. Intel has not observed this erratum on any commercially

available software.

Workaround: None identified.

Status:

For the steppings affected, see the Summary Tables of Changes.

Intel Core 2 Duo U7600 U7600 User Manual