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git.ipfire.org Git - thirdparty/glibc.git/blob - sysdeps/csky/nptl/tls.h
14dbf94ef65b33ad4b7902d5ff9280f1b9756278
1 /* Definitions for thread-local data handling. NPTL/C-SKY version.
2 Copyright (C) 2018 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 <http://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 ({ INTERNAL_SYSCALL_DECL (err); \
101 result_var = INTERNAL_SYSCALL (set_thread_area, err, 1, \
102 (char *) (tcbp) + TLS_TCB_OFFSET); \
103 INTERNAL_SYSCALL_ERROR_P (result_var, err) \
104 ? "unknown error" : NULL; })
106 /* Return the address of the dtv for the current thread. */
107 # define THREAD_DTV() \
108 (((tcbhead_t *) (READ_THREAD_POINTER () - TLS_TCB_OFFSET))->dtv)
110 /* Return the thread descriptor for the current thread. */
112 # define THREAD_SELF \
113 ((struct pthread *) (READ_THREAD_POINTER () \
114 - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE))
116 /* Magic for libthread_db to know how to do THREAD_SELF. */
117 # define DB_THREAD_SELF \
118 CONST_THREAD_AREA (32, sizeof (struct pthread))
120 /* Access to data in the thread descriptor is easy. */
121 # define THREAD_GETMEM(descr, member) \
123 # define THREAD_GETMEM_NC(descr, member, idx) \
125 # define THREAD_SETMEM(descr, member, value) \
126 descr->member = (value)
127 # define THREAD_SETMEM_NC(descr, member, idx, value) \
128 descr->member[idx] = (value)
130 /* Get and set the global scope generation counter in struct pthread. */
131 # define THREAD_GSCOPE_IN_TCB 1
132 # define THREAD_GSCOPE_FLAG_UNUSED 0
133 # define THREAD_GSCOPE_FLAG_USED 1
134 # define THREAD_GSCOPE_FLAG_WAIT 2
135 # define THREAD_GSCOPE_RESET_FLAG() \
138 = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \
139 THREAD_GSCOPE_FLAG_UNUSED); \
140 if (__res == THREAD_GSCOPE_FLAG_WAIT) \
141 lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \
144 # define THREAD_GSCOPE_SET_FLAG() \
147 THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \
148 atomic_write_barrier (); \
151 # define THREAD_GSCOPE_WAIT() \
152 GL(dl_wait_lookup_done) ()
154 #endif /* __ASSEMBLER__ */