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90 Product Errata

41322 Rev. 3.84 August 2011

Revision Guide for AMD Family 10h Processors

353 SYSRET Instruction May Execute Incorrectly Due to Breakpoint

Description

A SYSRET instruction executes incorrectly and an incorrect debug exception is 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

Yes

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