lib/libthr/arch/amd64/include/pthread_md.h

   1 /*-
   2  * Copyright (C) 2003 David Xu <davidxu@freebsd.org>
   3  * Copyright (c) 2001 Daniel Eischen <deischen@freebsd.org>
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Neither the name of the author nor the names of its contributors
  12  *    may be used to endorse or promote products derived from this software
  13  *    without specific prior written permission.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  *
  27  * $FreeBSD$
  28  */
  29
  30 /*
  31  * Machine-dependent thread prototypes/definitions.
  32  */
  33 #ifndef _PTHREAD_MD_H_
  34 #define _PTHREAD_MD_H_
  35
  36 #include <stddef.h>
  37 #include <sys/types.h>
  38 #include <machine/sysarch.h>
  39
  40 #define CPU_SPINWAIT            __asm __volatile("pause")
  41
  42 #define DTV_OFFSET              offsetof(struct tcb, tcb_dtv)
  43
  44 /*
  45  * Variant II tcb, first two members are required by rtld,
  46  * %fs points to the structure.
  47  */
  48 struct tcb {
  49         struct tcb              *tcb_self;      /* required by rtld */
  50         void                    *tcb_dtv;       /* required by rtld */
  51         struct pthread          *tcb_thread;
  52         void                    *tcb_spare[1];
  53 };
  54
  55 /*
  56  * Evaluates to the byte offset of the per-tcb variable name.
  57  */
  58 #define __tcb_offset(name)      __offsetof(struct tcb, name)
  59
  60 /*
  61  * Evaluates to the type of the per-tcb variable name.
  62  */
  63 #define __tcb_type(name)        __typeof(((struct tcb *)0)->name)
  64
  65 /*
  66  * Evaluates to the value of the per-tcb variable name.
  67  */
  68 #define TCB_GET64(name) ({                                      \
  69         __tcb_type(name) __result;                              \
  70                                                                 \
  71         u_long __i;                                             \
  72         __asm __volatile("movq %%fs:%1, %0"                     \
  73             : "=r" (__i)                                        \
  74             : "m" (*(volatile u_long *)(__tcb_offset(name))));  \
  75         __result = (__tcb_type(name))__i;                       \
  76                                                                 \
  77         __result;                                               \
  78 })
  79
  80 struct tcb      *_tcb_ctor(struct pthread *, int);
  81 void            _tcb_dtor(struct tcb *tcb);
  82
  83 static __inline void
  84 _tcb_set(struct tcb *tcb)
  85 {
  86         amd64_set_fsbase(tcb);
  87 }
  88
  89 static __inline struct tcb *
  90 _tcb_get(void)
  91 {
  92         return (TCB_GET64(tcb_self));
  93 }
  94
  95 static __inline struct pthread *
  96 _get_curthread(void)
  97 {
  98         return (TCB_GET64(tcb_thread));
  99 }
 100
 101 #define HAS__UMTX_OP_ERR        1
 102
 103 #endif