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68b6aaa70d
Compiling with clang gives a loss-of-alignment error due the cast to uint8_t *. Since the TLS is always tcb aligned and TP_OFFSET is defined as sizeof(struct tcb) we can guarantee there is no misalignment. Silence the error by moving the offset into the inline assembly. Reviewed by: br MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D21926
90 lines
2.7 KiB
C
90 lines
2.7 KiB
C
/*-
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* Copyright (c) 2005 David Xu <davidxu@freebsd.org>
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* Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com>
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* All rights reserved.
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*
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* Portions of this software were developed by SRI International and the
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* University of Cambridge Computer Laboratory under DARPA/AFRL contract
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* FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
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*
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* Portions of this software were developed by the University of Cambridge
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* Computer Laboratory as part of the CTSRD Project, with support from the
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* UK Higher Education Innovation Fund (HEIF).
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* Machine-dependent thread prototypes/definitions.
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*/
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#ifndef _PTHREAD_MD_H_
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#define _PTHREAD_MD_H_
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#include <sys/types.h>
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#include <stddef.h>
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#define CPU_SPINWAIT
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#define DTV_OFFSET offsetof(struct tcb, tcb_dtv)
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#define TP_OFFSET sizeof(struct tcb)
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/*
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* Variant I tcb. The structure layout is fixed, don't blindly
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* change it!
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*/
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struct tcb {
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void *tcb_dtv;
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struct pthread *tcb_thread;
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};
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/* Called from the thread to set its private data. */
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static __inline void
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_tcb_set(struct tcb *tcb)
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{
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__asm __volatile("addi tp, %0, %1" :: "r"(tcb), "I"(TP_OFFSET));
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}
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/*
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* Get the current tcb.
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*/
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static __inline struct tcb *
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_tcb_get(void)
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{
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struct tcb *_tcb;
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__asm __volatile("addi %0, tp, %1" : "=r"(_tcb) : "I"(-TP_OFFSET));
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return (_tcb);
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}
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static __inline struct pthread *
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_get_curthread(void)
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{
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if (_thr_initial)
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return (_tcb_get()->tcb_thread);
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return (NULL);
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}
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#endif /* _PTHREAD_MD_H_ */
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