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/* $OpenBSD: tcb.h,v 1.2 2016/05/18 20:21:13 guenther Exp $ */
/*
* Copyright (c) 2011 Philip Guenther <guenther@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef _MACHINE_TCB_H_
#define _MACHINE_TCB_H_
#ifdef _KERNEL
/*
* In userspace, register gbr contains the address of the thread's TCB
*/
#define TCB_GET(p) ((void *)(p)->p_md.md_regs->tf_gbr)
#define TCB_SET(p, addr) ((p)->p_md.md_regs->tf_gbr = (int)(addr))
#else /* _KERNEL */
/* ELF TLS ABI calls for small TCB, with static TLS data after it */
#define TLS_VARIANT 1
/* Get a pointer to the TCB itself */
static inline void *
__sh_get_tcb(void)
{
void *__val;
__asm__ ("stc gbr, %0" : "=r" (__val));
return __val;
}
#define TCB_GET() __sh_get_tcb()
#define TCB_SET(tcb) __asm__ ("ldc %0, gbr" : : "r" (tcb));
#endif /* _KERNEL */
#endif /* _MACHINE_TCB_H_ */
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