Assertion: segment register | /r/ObjectUse | used for this purpose
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text: Since Windows and Linux both used FSand GS (thanks Nick for the clarification) for this purpose in the 32 bit version, AMD decided to let the 64 bit segment registers (GS and FS) be used essentially only for this purpose (I think you can make them point anywhere in your process space; dunno if the application code can load them or not).