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sourceware.org Git - glibc.git/blob - sysdeps/csky/nptl/tls.h
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1 /* Definitions for thread-local data handling. NPTL/C-SKY version.
2 Copyright (C) 2018-2021 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/>. */
29 /* Define r31 as thread pointer register. */
30 # define READ_THREAD_POINTER() \
32 __asm__ __volatile__ ("mov %0, r31" \
37 # include <tcb-offsets.h>
38 /* Define r31 as thread pointer register. */
39 # define READ_THREAD_POINTER() \
41 #endif /* __ASSEMBLER__ */
45 /* Get system call information. */
48 /* The TP points to the start of the thread blocks. */
49 # define TLS_DTV_AT_TP 1
50 # define TLS_TCB_AT_TP 0
52 /* Get the thread descriptor definition. */
53 # include <nptl/descr.h>
61 /* This is the size of the initial TCB. */
62 # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
64 /* Alignment requirements for the initial TCB. */
65 # define TLS_INIT_TCB_ALIGN 8
67 /* This is the size of the TCB. */
68 # define TLS_TCB_SIZE sizeof (tcbhead_t)
70 /* Alignment requirements for the TCB. */
71 # define TLS_TCB_ALIGN 8
73 /* This is the size we need before TCB. */
74 # define TLS_PRE_TCB_SIZE sizeof (struct pthread)
76 /* The thread pointer tp points to the end of the TCB.
77 The pthread_descr structure is immediately in front of the TCB. */
78 # define TLS_TCB_OFFSET 0
80 /* Install the dtv pointer. The pointer passed is to the element with
81 index -1 which contain the length. */
82 # define INSTALL_DTV(tcbp, dtvp) \
83 (((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1)
85 /* Install new dtv for current thread. */
86 # define INSTALL_NEW_DTV(dtv) \
87 (THREAD_DTV() = (dtv))
89 /* Return dtv of given thread descriptor. */
90 # define GET_DTV(tcbp) \
91 (((tcbhead_t *) (tcbp))->dtv)
93 # define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) + 1
95 /* Code to initially initialize the thread pointer. This might need
96 special attention since 'errno' is not yet available and if the
97 operation can cause a failure 'errno' must not be touched. */
98 # define TLS_INIT_TP(tcbp) \
99 ({ long int result_var; \
100 result_var = INTERNAL_SYSCALL_CALL (set_thread_area, \
101 (char *) (tcbp) + TLS_TCB_OFFSET); \
102 INTERNAL_SYSCALL_ERROR_P (result_var) \
103 ? "unknown error" : NULL; })
105 /* Return the address of the dtv for the current thread. */
106 # define THREAD_DTV() \
107 (((tcbhead_t *) (READ_THREAD_POINTER () - TLS_TCB_OFFSET))->dtv)
109 /* Return the thread descriptor for the current thread. */
111 # define THREAD_SELF \
112 ((struct pthread *) (READ_THREAD_POINTER () \
113 - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE))
115 /* Magic for libthread_db to know how to do THREAD_SELF. */
116 # define DB_THREAD_SELF \
117 CONST_THREAD_AREA (32, sizeof (struct pthread))
119 # include <tcb-access.h>
121 /* Get and set the global scope generation counter in struct pthread. */
122 # define THREAD_GSCOPE_FLAG_UNUSED 0
123 # define THREAD_GSCOPE_FLAG_USED 1
124 # define THREAD_GSCOPE_FLAG_WAIT 2
125 # define THREAD_GSCOPE_RESET_FLAG() \
128 = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \
129 THREAD_GSCOPE_FLAG_UNUSED); \
130 if (__res == THREAD_GSCOPE_FLAG_WAIT) \
131 lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \
134 # define THREAD_GSCOPE_SET_FLAG() \
137 THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \
138 atomic_write_barrier (); \
142 #endif /* __ASSEMBLER__ */
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