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98 Product Errata

25759 Rev. 3.79 July 2009

Revision Guide for AMD Athlon™ 64 and AMD Opteron™ Processors

353 SYSRET Instruction May Execute Incorrectly Due to

Breakpoint

Description

A SYSRET instruction will execute incorrectly and an incorrect debug exception will be taken when

all of the following conditions are satisfied:

• An enabled instruction breakpoint address matches the RIP of the SYSRET instruction.

• The processor is in 64-bit mode or compatibility mode.

• The instruction would not generate any other exception.

• R11[16] is cleared to 0b.

• RFLAGS.RF is set to 1b.

Potential Effect on System

None expected during normal operation. Kernel debuggers may observe unpredictable system

behavior.

Suggested Workaround

Software should set R11[16] to 1b before executing the SYSRET instruction in 64-bit mode.

Fix Planned

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AMD Athlon 6 Specifiche Pagina 98