1/* $OpenBSD: tcb.h,v 1.2 2016/05/18 20:21:13 guenther 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/* 25 * In userspace, register gbr contains the address of the thread's TCB 26 */ 27#define TCB_GET(p) ((void *)(p)->p_md.md_regs->tf_gbr) 28#define TCB_SET(p, addr) ((p)->p_md.md_regs->tf_gbr = (int)(addr)) 29 30#else /* _KERNEL */ 31 32/* ELF TLS ABI calls for small TCB, with static TLS data after it */ 33#define TLS_VARIANT 1 34 35/* Get a pointer to the TCB itself */ 36static inline void * 37__sh_get_tcb(void) 38{ 39 void *__val; 40 __asm__ ("stc gbr, %0" : "=r" (__val)); 41 return __val; 42} 43#define TCB_GET() __sh_get_tcb() 44#define TCB_SET(tcb) __asm__ ("ldc %0, gbr" : : "r" (tcb)); 45 46#endif /* _KERNEL */ 47 48#endif /* _MACHINE_TCB_H_ */ 49