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/* $OpenBSD: tcb.h,v 1.4 2014/03/29 18:09:30 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
#include <machine/reg.h>
/*
* In userspace, register %g7 contains the address of the thread's TCB
*/
#define TCB_GET(p) \
((void *)(p)->p_md.md_tf->tf_global[7])
#define TCB_SET(p, addr) \
((p)->p_md.md_tf->tf_global[7] = (int)(addr))
#else /* _KERNEL */
/* ELF TLS ABI calls for big TCB, with static TLS data at negative offsets */
#define TLS_VARIANT 2
#if 0 /* XXX perhaps use the gcc global register extension? */
struct thread_control_block;
__register__ struct thread_control_block *__tcb __asm__ ("%g7");
#define TCB_GET() (__tcb)
#define TCB_GET_MEMBER(member) ((void *)(__tcb->member))
#define TCB_SET(tcb) ((__tcb) = (tcb))
#else
#include <stddef.h> /* for offsetof */
/* Get a pointer to the TCB itself */
static inline void *
__sparc_get_tcb(void)
{
void *val;
__asm__ ("mov %%g7, %0" : "=r" (val));
return val;
}
#define TCB_GET() __sparc_get_tcb()
/* Get the value of a specific member in the TCB */
static inline void *
__sparc_read_tcb(int offset)
{
void *val;
__asm__ ("ld [%%g7 + %1], %0" : "=r" (val) : "r" (offset));
return val;
}
#define TCB_GET_MEMBER(member) \
__sparc_read_tcb(offsetof(struct thread_control_block, member))
#define TCB_SET(tcb) __asm volatile("mov %0, %%g7" : : "r" (tcb))
#endif /* 0 */
#endif /* _KERNEL */
#endif /* _MACHINE_TCB_H_ */
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