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The SoftMMU now receives full X86::LogicalAddress values from SoftCPU. This allows the MMU to reroute TLS accesses to a special memory region. The ELF executable's PT_TLS header tells us how to allocate the TLS. Basically, the GS register points to a magical 4-byte area which has a pointer to the TCB (thread control block). The TCB lives in normal flat memory space and is accessed through the DS register.