2 * Copyright (c) 2005 The DragonFly Project. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
14 * 3. Neither the name of The DragonFly Project nor the names of its
15 * contributors may be used to endorse or promote products derived
16 * from this software without specific, prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
22 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
24 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
26 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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28 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * $DragonFly: src/sys/cpu/i386/include/tls.h,v 1.12 2007/04/13 12:12:27 corecode Exp $
38 #include <sys/types.h>
45 * NOTE: the tcb_{self,dtv,pthread,errno) fields must be declared
46 * in the structure in the specified order as assembly will access the
47 * fields with a hardwired offset.
49 * Outside of this file, the system call layer generation will hardwire
50 * the offset for tcb_errno.
53 struct tls_tcb *tcb_self; /* pointer to self*/
54 void *tcb_dtv; /* Dynamic Thread Vector */
55 void *tcb_pthread; /* thread library's data*/
56 int *tcb_errno_p; /* pointer to per-thread errno */
61 uintptr_t dtv_generation;
62 uintptr_t dtv_max_index;
63 void *dtv_offset[__ARRAY_ZERO];
66 #define RTLD_TCB_HAS_SELF_POINTER
67 #define RTLD_STATIC_TLS_ALIGN 16
68 #define RTLD_STATIC_TLS_ALIGN_MASK (RTLD_STATIC_TLS_ALIGN - 1)
69 #define RTLD_STATIC_TLS_EXTRA 256
70 #define RTLD_STATIC_TLS_VARIANT_II
72 /* Get the current TCB. */
73 static __inline struct tls_tcb *
78 __asm __volatile ("movl %%gs:%1, %0"
80 : "m" (((struct tls_tcb *)0)->tcb_self));
85 /* Get the current thread. */
86 static __inline void *
87 tls_get_curthread(void)
91 __asm __volatile ("movl %%gs:%1, %0"
93 : "m" (((struct tls_tcb *)0)->tcb_pthread));
99 tls_set_tcb(struct tls_tcb *tcb)
101 struct tls_info info;
106 seg = set_tls_area(0, &info, sizeof(info));
107 __asm __volatile("mov %0, %%gs" : : "g" (seg));
111 tls_set_gs(void *base, size_t bytes)
113 struct tls_info info;
118 seg = set_tls_area(0, &info, sizeof(info));
119 __asm __volatile("mov %0, %%gs" : : "g" (seg));
123 tls_set_fs(void *base, size_t bytes)
125 struct tls_info info;
130 seg = set_tls_area(1, &info, sizeof(info));
131 __asm __volatile("mov %0, %%fs" : : "g" (seg));
136 struct tls_tcb *_rtld_allocate_tls(void);
137 struct tls_tcb *_libc_allocate_tls(void);
138 void _rtld_free_tls(struct tls_tcb *);
139 void _libc_free_tls(struct tls_tcb *);
140 void _rtld_call_init(void);
141 struct tls_tcb *_libc_init_tls(void);
142 struct tls_tcb *_init_tls(void);
146 #endif /* !_CPU_TLS_H_ */