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1 /* Definition for thread-local data handling. NPTL/ARC version.
2 Copyright (C) 2020-2021 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library. If not, see
17 <https://www.gnu.org/licenses/>. */
19 #ifndef _ARC_NPTL_TLS_H
20 #define _ARC_NPTL_TLS_H 1
22 #include <dl-sysdep.h>
32 /* Get system call information. */
35 /* The TLS blocks start right after the TCB. */
36 # define TLS_DTV_AT_TP 1
37 # define TLS_TCB_AT_TP 0
39 /* Get the thread descriptor definition. */
40 # include <nptl/descr.h>
45 uintptr_t pointer_guard
;
48 /* This is the size of the initial TCB. */
49 # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
51 /* Alignment requirements for the initial TCB. */
52 # define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread)
54 /* This is the size of the TCB. */
56 # define TLS_TCB_SIZE sizeof (tcbhead_t)
59 /* Alignment requirements for the TCB. */
60 # define TLS_TCB_ALIGN __alignof__ (struct pthread)
62 /* This is the size we need before TCB. */
63 # define TLS_PRE_TCB_SIZE sizeof (struct pthread)
65 /* Install the dtv pointer. The pointer passed is to the element with
66 index -1 which contain the length. */
67 # define INSTALL_DTV(tcbp, dtvp) \
68 (((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1)
70 /* Install new dtv for current thread. */
71 # define INSTALL_NEW_DTV(dtv) \
72 (THREAD_DTV() = (dtv))
74 /* Return dtv of given thread descriptor. */
75 # define GET_DTV(tcbp) \
76 (((tcbhead_t *) (tcbp))->dtv)
78 /* Code to initially initialize the thread pointer. */
79 # define TLS_INIT_TP(tcbp) \
82 __builtin_set_thread_pointer (tcbp); \
83 result_var = INTERNAL_SYSCALL_CALL (arc_settls, (tcbp));\
84 INTERNAL_SYSCALL_ERROR_P (result_var) \
85 ? "settls syscall error" : NULL; \
88 /* Value passed to 'clone' for initialization of the thread register. */
89 # define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) + 1
91 /* Return the address of the dtv for the current thread. */
92 # define THREAD_DTV() \
93 (((tcbhead_t *) __builtin_thread_pointer ())->dtv)
95 /* Return the thread descriptor for the current thread. */
96 # define THREAD_SELF \
97 ((struct pthread *)__builtin_thread_pointer () - 1)
99 /* Magic for libthread_db to know how to do THREAD_SELF. */
100 # define DB_THREAD_SELF \
101 CONST_THREAD_AREA (32, sizeof (struct pthread))
103 # include <tcb-access.h>
105 /* Get and set the global scope generation counter in struct pthread. */
106 #define THREAD_GSCOPE_FLAG_UNUSED 0
107 #define THREAD_GSCOPE_FLAG_USED 1
108 #define THREAD_GSCOPE_FLAG_WAIT 2
109 #define THREAD_GSCOPE_RESET_FLAG() \
112 = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \
113 THREAD_GSCOPE_FLAG_UNUSED); \
114 if (__res == THREAD_GSCOPE_FLAG_WAIT) \
115 lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \
118 #define THREAD_GSCOPE_SET_FLAG() \
121 THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \
122 atomic_write_barrier (); \
126 #endif /* !__ASSEMBLER__ */
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