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02a9f771 | 1 | /* Definition for thread-local data handling. NPTL/ARM version. |
ce001f45 | 2 | Copyright (C) 2005, 2007, 2011 Free Software Foundation, Inc. |
02a9f771 DJ |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. */ | |
19 | ||
20 | #ifndef _TLS_H | |
21 | #define _TLS_H 1 | |
22 | ||
23 | #include <dl-sysdep.h> | |
24 | ||
25 | #ifndef __ASSEMBLER__ | |
26 | # include <stdbool.h> | |
27 | # include <stddef.h> | |
28 | # include <stdint.h> | |
29 | ||
30 | /* Type for the dtv. */ | |
31 | typedef union dtv | |
32 | { | |
33 | size_t counter; | |
34 | struct | |
35 | { | |
36 | void *val; | |
37 | bool is_static; | |
38 | } pointer; | |
39 | } dtv_t; | |
40 | ||
41 | #else /* __ASSEMBLER__ */ | |
42 | # include <tcb-offsets.h> | |
43 | #endif /* __ASSEMBLER__ */ | |
44 | ||
45 | ||
02a9f771 DJ |
46 | #ifndef __ASSEMBLER__ |
47 | ||
48 | /* Get system call information. */ | |
49 | # include <sysdep.h> | |
50 | ||
51 | /* The TP points to the start of the thread blocks. */ | |
52 | # define TLS_DTV_AT_TP 1 | |
53 | ||
54 | /* Get the thread descriptor definition. */ | |
55 | # include <nptl/descr.h> | |
56 | ||
57 | typedef struct | |
58 | { | |
59 | dtv_t *dtv; | |
60 | void *private; | |
61 | } tcbhead_t; | |
62 | ||
63 | /* This is the size of the initial TCB. */ | |
64 | # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t) | |
65 | ||
66 | /* Alignment requirements for the initial TCB. */ | |
67 | # define TLS_INIT_TCB_ALIGN 16 | |
68 | ||
69 | /* This is the size of the TCB. */ | |
70 | # define TLS_TCB_SIZE sizeof (tcbhead_t) | |
71 | ||
72 | /* This is the size we need before TCB. */ | |
73 | # define TLS_PRE_TCB_SIZE sizeof (struct pthread) | |
74 | ||
75 | /* Alignment requirements for the TCB. */ | |
76 | # define TLS_TCB_ALIGN 16 | |
77 | ||
78 | /* Install the dtv pointer. The pointer passed is to the element with | |
79 | index -1 which contain the length. */ | |
80 | # define INSTALL_DTV(tcbp, dtvp) \ | |
81 | (((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1) | |
82 | ||
83 | /* Install new dtv for current thread. */ | |
84 | # define INSTALL_NEW_DTV(dtv) \ | |
85 | (THREAD_DTV() = (dtv)) | |
86 | ||
87 | /* Return dtv of given thread descriptor. */ | |
88 | # define GET_DTV(tcbp) \ | |
89 | (((tcbhead_t *) (tcbp))->dtv) | |
90 | ||
91 | /* Code to initially initialize the thread pointer. This might need | |
92 | special attention since 'errno' is not yet available and if the | |
93 | operation can cause a failure 'errno' must not be touched. */ | |
94 | # define TLS_INIT_TP(tcbp, secondcall) \ | |
95 | ({ INTERNAL_SYSCALL_DECL (err); \ | |
96 | long result_var; \ | |
97 | result_var = INTERNAL_SYSCALL_ARM (set_tls, err, 1, (tcbp)); \ | |
98 | INTERNAL_SYSCALL_ERROR_P (result_var, err) \ | |
99 | ? "unknown error" : NULL; }) | |
100 | ||
101 | /* Return the address of the dtv for the current thread. */ | |
102 | # define THREAD_DTV() \ | |
103 | (((tcbhead_t *) __builtin_thread_pointer ())->dtv) | |
104 | ||
105 | /* Return the thread descriptor for the current thread. */ | |
106 | # define THREAD_SELF \ | |
107 | ((struct pthread *)__builtin_thread_pointer () - 1) | |
108 | ||
109 | /* Magic for libthread_db to know how to do THREAD_SELF. */ | |
110 | # define DB_THREAD_SELF \ | |
111 | CONST_THREAD_AREA (32, sizeof (struct pthread)) | |
112 | ||
113 | /* Access to data in the thread descriptor is easy. */ | |
114 | #define THREAD_GETMEM(descr, member) \ | |
115 | descr->member | |
116 | #define THREAD_GETMEM_NC(descr, member, idx) \ | |
117 | descr->member[idx] | |
118 | #define THREAD_SETMEM(descr, member, value) \ | |
119 | descr->member = (value) | |
120 | #define THREAD_SETMEM_NC(descr, member, idx, value) \ | |
121 | descr->member[idx] = (value) | |
122 | ||
123 | /* Initializing the thread pointer will generate a SIGILL if the syscall | |
124 | is not available. */ | |
125 | #define TLS_INIT_TP_EXPENSIVE 1 | |
126 | ||
30efab51 DJ |
127 | /* Get and set the global scope generation counter in struct pthread. */ |
128 | #define THREAD_GSCOPE_FLAG_UNUSED 0 | |
129 | #define THREAD_GSCOPE_FLAG_USED 1 | |
130 | #define THREAD_GSCOPE_FLAG_WAIT 2 | |
131 | #define THREAD_GSCOPE_RESET_FLAG() \ | |
132 | do \ | |
133 | { int __res \ | |
134 | = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \ | |
135 | THREAD_GSCOPE_FLAG_UNUSED); \ | |
136 | if (__res == THREAD_GSCOPE_FLAG_WAIT) \ | |
713ddf8d | 137 | lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \ |
30efab51 DJ |
138 | } \ |
139 | while (0) | |
140 | #define THREAD_GSCOPE_SET_FLAG() \ | |
141 | do \ | |
142 | { \ | |
143 | THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \ | |
144 | atomic_write_barrier (); \ | |
145 | } \ | |
146 | while (0) | |
147 | #define THREAD_GSCOPE_WAIT() \ | |
148 | GL(dl_wait_lookup_done) () | |
149 | ||
02a9f771 DJ |
150 | #endif /* __ASSEMBLER__ */ |
151 | ||
152 | #endif /* tls.h */ |