en Copyright 2015 Java http://kernelsources.org:8080/source/history/freebsd/sys/powerpc/include/tls.h#1a62e9bc0046bfe20f4dd785561e469ff73fd508 Add <machine/tls.h> header to hold MD constants and helpers for TLS.The header exports the following:- Definition of struct tcb.- Helpers to get/set the tcb for the current thread.- TLS_TCB_SIZE (size of TCB)- TLS_TCB_ALIGN (alignment of TCB)- TLS_VARIANT_I or TLS_VARIANT_II- TLS_DTV_OFFSET (bias of pointers in dtv[])- TLS_TP_OFFSET (bias of "thread pointer" relative to TCB)Note that TLS_TP_OFFSET does not account for if the unbiased threadpointer points to the start of the TCB (arm and x86) or the end of theTCB (MIPS, PowerPC, and RISC-V).Note also that for amd64, the struct tcb does not include the unusedtcb_spare field included in the current structure in libthr. libthrdoes not use this field, and the existing calls in libc and rtld thatallocate a TCB for amd64 assume it is the size of 3 Elf_Addr's (andthus do not allocate room for tcb_spare).A <sys/_tls_variant_i.h> header is used by architectures usingVariant I TLS which uses a common struct tcb.Reviewed by: kib (older version of x86/tls.h), jrtc27Sponsored by: The University of Cambridge, Google Inc.Differential Revision: https://reviews.freebsd.org/D33351 List of files: /freebsd/sys/powerpc/include/tls.h Thu, 09 Dec 2021 22:17:13 +0100 John Baldwin <jhb@FreeBSD.org>