1/* $OpenBSD: tcb.h,v 1.3 2021/05/12 01:20:52 jsg Exp $ */ 2 3/* 4 * Copyright (c) 2019 Brian Bamsch <bbamsch@google.com> 5 * Copyright (c) 2011 Philip Guenther <guenther@openbsd.org> 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20#ifndef _MACHINE_TCB_H_ 21#define _MACHINE_TCB_H_ 22 23#ifdef _KERNEL 24 25#include <machine/pcb.h> 26 27#define TCB_GET(p) \ 28 ((void *)(((struct pcb *)(p)->p_addr)->pcb_tf->tf_tp)) 29 30#define TCB_SET(p, addr) \ 31 do { \ 32 ((struct pcb *)(p)->p_addr)->pcb_tf->tf_tp = (long)(addr); \ 33 } while (0) 34 35#else /* _KERNEL */ 36 37/* ELF TLS ABI calls for small TCB, with static TLS data after it */ 38#define TLS_VARIANT 1 39 40static inline void * 41__riscv64_read_tcb(void) 42{ 43 void *tcb; 44 __asm volatile("mv %0, tp": "=r" (tcb)); 45 return tcb; 46} 47 48#define TCB_GET() __riscv64_read_tcb() 49 50#endif /* _KERNEL */ 51 52#endif /* _MACHINE_TCB_H_ */ 53