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_ */