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sourceware.org Git - glibc.git/blob - sysdeps/aarch64/nptl/tls.h
1 /* Copyright (C) 2005-2021 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 License as
7 published by the Free Software Foundation; either version 2.1 of the
8 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/>. */
22 #include <dl-sysdep.h>
30 #else /* __ASSEMBLER__ */
31 # include <tcb-offsets.h>
32 #endif /* __ASSEMBLER__ */
36 /* Get system call information. */
39 /* The TP points to the start of the thread blocks. */
40 # define TLS_DTV_AT_TP 1
41 # define TLS_TCB_AT_TP 0
43 /* Get the thread descriptor definition. */
44 # include <nptl/descr.h>
52 /* This is the size of the initial TCB. */
53 # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
55 /* This is the size of the TCB. */
56 # define TLS_TCB_SIZE sizeof (tcbhead_t)
58 /* This is the size we need before TCB. */
59 # define TLS_PRE_TCB_SIZE sizeof (struct pthread)
61 /* Install the dtv pointer. The pointer passed is to the element with
62 index -1 which contain the length. */
63 # define INSTALL_DTV(tcbp, dtvp) \
64 (((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1)
66 /* Install new dtv for current thread. */
67 # define INSTALL_NEW_DTV(dtv) \
68 (THREAD_DTV() = (dtv))
70 /* Return dtv of given thread descriptor. */
71 # define GET_DTV(tcbp) \
72 (((tcbhead_t *) (tcbp))->dtv)
74 /* Code to initially initialize the thread pointer. This might need
75 special attention since 'errno' is not yet available and if the
76 operation can cause a failure 'errno' must not be touched. */
77 # define TLS_INIT_TP(tcbp) \
78 ({ __asm __volatile ("msr tpidr_el0, %0" : : "r" (tcbp)); NULL; })
80 /* Value passed to 'clone' for initialization of the thread register. */
81 # define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) + 1
83 /* Return the address of the dtv for the current thread. */
84 # define THREAD_DTV() \
85 (((tcbhead_t *) __builtin_thread_pointer ())->dtv)
87 /* Return the thread descriptor for the current thread. */
88 # define THREAD_SELF \
89 ((struct pthread *)__builtin_thread_pointer () - 1)
91 /* Magic for libthread_db to know how to do THREAD_SELF. */
92 # define DB_THREAD_SELF \
93 CONST_THREAD_AREA (64, sizeof (struct pthread))
95 # include <tcb-access.h>
97 /* Get and set the global scope generation counter in struct pthread. */
98 # define THREAD_GSCOPE_FLAG_UNUSED 0
99 # define THREAD_GSCOPE_FLAG_USED 1
100 # define THREAD_GSCOPE_FLAG_WAIT 2
101 # define THREAD_GSCOPE_RESET_FLAG() \
104 = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \
105 THREAD_GSCOPE_FLAG_UNUSED); \
106 if (__res == THREAD_GSCOPE_FLAG_WAIT) \
107 lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \
110 # define THREAD_GSCOPE_SET_FLAG() \
113 THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \
114 atomic_write_barrier (); \
118 # endif /* __ASSEMBLER__ */
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