2 * Copyright (c) 2002 Daniel Eischen <deischen@freebsd.org>.
3 * Copyright (c) 2005 David Xu <davidxu@freebsd.org>.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
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
27 * $FreeBSD: src/lib/libpthread/arch/i386/include/pthread_md.h,v 1.13 2004/11/06 03:35:51 peter Exp $
28 * $DragonFly: src/lib/libthread_xu/arch/i386/include/pthread_md.h,v 1.1 2005/02/01 12:38:27 davidxu Exp $
32 * Machine-dependent thread prototypes/definitions for the thread kernel.
34 #ifndef _PTHREAD_MD_H_
35 #define _PTHREAD_MD_H_
38 #include <sys/types.h>
39 #include <machine/sysarch.h>
41 #define DTV_OFFSET offsetof(struct tcb, tcb_dtv)
46 * %gs points to a struct tcb.
49 struct tcb *tcb_self; /* required by rtld */
50 void *tcb_dtv; /* required by rtld */
51 struct pthread *tcb_thread;
56 * Evaluates to the byte offset of the per-thread variable name.
58 #define __tcb_offset(name) __offsetof(struct tcb, name)
61 * Evaluates to the type of the per-thread variable name.
63 #define __tcb_type(name) __typeof(((struct tcb *)0)->name)
66 * Evaluates to the value of the per-kse variable name.
68 #define TCB_GET32(name) ({ \
69 __tcb_type(name) __result; \
72 __asm __volatile("movl %%gs:%1, %0" \
74 : "m" (*(u_int *)(__tcb_offset(name)))); \
75 __result = (__tcb_type(name))__i; \
82 atomic_cmpset_int(volatile int *dst, int exp, int src)
87 " lock cmpxchgl %1,%2 ; "
92 : "+a" (res) /* 0 (result) */
100 #define atomic_cmpset_acq_int atomic_cmpset_int
106 struct tcb *_tcb_ctor(struct pthread *, int);
107 void _tcb_dtor(struct tcb *tcb);
109 /* Called from the thread to set its private data. */
111 _tcb_set(struct tcb *tcb)
116 val = (tcb->tcb_ldt << 3) | 7;
117 __asm __volatile("movl %0, %%gs" : : "r" (val));
119 _amd64_set_gsbase(tcb);
124 /* Get the current kcb. */
125 static __inline struct tcb *
128 return (TCB_GET32(tcb_self));
131 extern struct pthread *_thr_initial;
133 /* Get the current thread. */
134 static __inline struct pthread *
138 return (TCB_GET32(tcb_thread));