1/* $OpenBSD: tcb.h,v 1.7 2017/04/20 10:03:40 kettenis Exp $ */ 2 3/* 4 * Copyright (c) 2011 Philip Guenther <guenther@openbsd.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19#ifndef _MACHINE_TCB_H_ 20#define _MACHINE_TCB_H_ 21 22#ifdef _KERNEL 23 24#include <machine/reg.h> 25 26/* 27 * In userspace, register %g7 contains the address of the thread's TCB 28 */ 29#define TCB_GET(p) \ 30 ((void *)(p)->p_md.md_tf->tf_global[7]) 31#define TCB_SET(p, addr) \ 32 ((p)->p_md.md_tf->tf_global[7] = (int64_t)(addr)) 33 34#else /* _KERNEL */ 35 36/* ELF TLS ABI calls for big TCB, with static TLS data at negative offsets */ 37#define TLS_VARIANT 2 38 39register void *__tcb __asm__ ("g7"); 40#define TCB_GET() (__tcb) 41#define TCB_SET(tcb) ((__tcb) = (tcb)) 42 43#endif /* _KERNEL */ 44#endif /* _MACHINE_TCB_H_ */ 45