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1 | /* Definition for thread-local data handling. NPTL/Nios II version. |
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2 | Copyright (C) 2012-2022 Free Software Foundation, Inc. |
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, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #ifndef _TLS_H |
20 | #define _TLS_H 1 |
21 | |
22 | #include <dl-sysdep.h> |
23 | |
24 | #ifndef __ASSEMBLER__ |
25 | # include <stdbool.h> |
26 | # include <stddef.h> |
27 | # include <stdint.h> |
28 | # include <dl-dtv.h> |
29 | |
30 | #else /* __ASSEMBLER__ */ |
31 | # include <tcb-offsets.h> |
32 | #endif /* __ASSEMBLER__ */ |
33 | |
34 | |
35 | #ifndef __ASSEMBLER__ |
36 | |
37 | /* Get system call information. */ |
38 | # include <sysdep.h> |
39 | |
40 | /* The TP points to the start of the thread blocks. */ |
41 | # define TLS_DTV_AT_TP 1 |
42 | # define TLS_TCB_AT_TP 0 |
43 | |
44 | /* Get the thread descriptor definition. */ |
45 | # include <nptl/descr.h> |
46 | |
47 | typedef struct |
48 | { |
49 | dtv_t *dtv; |
50 | uintptr_t pointer_guard; |
51 | unsigned spare[6]; |
52 | } tcbhead_t; |
53 | |
54 | register struct pthread *__thread_self __asm__("r23"); |
55 | |
56 | #define READ_THREAD_POINTER() ((void *) __thread_self) |
57 | |
58 | /* This is the size of the initial TCB. Because our TCB is before the thread |
59 | pointer, we don't need this. */ |
60 | # define TLS_INIT_TCB_SIZE 0 |
61 | |
62 | /* This is the size of the TCB. Because our TCB is before the thread |
63 | pointer, we don't need this. */ |
64 | # define TLS_TCB_SIZE 0 |
65 | |
66 | /* This is the size we need before TCB - actually, it includes the TCB. */ |
67 | # define TLS_PRE_TCB_SIZE \ |
68 | (sizeof (struct pthread) \ |
69 | + ((sizeof (tcbhead_t) + __alignof (struct pthread) - 1) \ |
70 | & ~(__alignof (struct pthread) - 1))) |
71 | |
72 | /* The thread pointer (in hardware register r23) points to the end of |
73 | the TCB + 0x7000, as for PowerPC and MIPS. */ |
74 | # define TLS_TCB_OFFSET 0x7000 |
75 | |
76 | /* Install the dtv pointer. The pointer passed is to the element with |
77 | index -1 which contain the length. */ |
78 | # define INSTALL_DTV(tcbp, dtvp) \ |
79 | (((tcbhead_t *) (tcbp))[-1].dtv = (dtvp) + 1) |
80 | |
81 | /* Install new dtv for current thread. */ |
82 | # define INSTALL_NEW_DTV(dtv) \ |
83 | (THREAD_DTV() = (dtv)) |
84 | |
85 | /* Return dtv of given thread descriptor. */ |
86 | # define GET_DTV(tcbp) \ |
87 | (((tcbhead_t *) (tcbp))[-1].dtv) |
88 | |
89 | /* Code to initially initialize the thread pointer. */ |
90 | # define TLS_INIT_TP(tcbp) \ |
91 | (__thread_self = (struct pthread *) ((char *) tcbp + TLS_TCB_OFFSET), NULL) |
92 | |
93 | /* Value passed to 'clone' for initialization of the thread register. */ |
94 | # define TLS_DEFINE_INIT_TP(tp, pd) \ |
95 | void *tp = (void *) (pd) + TLS_TCB_OFFSET + TLS_PRE_TCB_SIZE |
96 | |
97 | /* Return the address of the dtv for the current thread. */ |
98 | # define THREAD_DTV() \ |
99 | (((tcbhead_t *) (READ_THREAD_POINTER () - TLS_TCB_OFFSET))[-1].dtv) |
100 | |
101 | /* Return the thread descriptor for the current thread. */ |
102 | # define THREAD_SELF \ |
103 | ((struct pthread *) (READ_THREAD_POINTER () \ |
104 | - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE)) |
105 | |
106 | /* Magic for libthread_db to know how to do THREAD_SELF. */ |
107 | # define DB_THREAD_SELF \ |
108 | REGISTER (32, 32, 23 * 4, -TLS_PRE_TCB_SIZE - TLS_TCB_OFFSET) |
109 | |
110 | # include <tcb-access.h> |
111 | |
112 | # define THREAD_GET_POINTER_GUARD() \ |
113 | (((tcbhead_t *) (READ_THREAD_POINTER () \ |
114 | - TLS_TCB_OFFSET))[-1].pointer_guard) |
115 | # define THREAD_SET_POINTER_GUARD(value) \ |
116 | (THREAD_GET_POINTER_GUARD () = (value)) |
117 | # define THREAD_COPY_POINTER_GUARD(descr) \ |
118 | (((tcbhead_t *) ((void *) (descr) \ |
119 | + TLS_PRE_TCB_SIZE))[-1].pointer_guard \ |
120 | = THREAD_GET_POINTER_GUARD()) |
121 | |
122 | /* l_tls_offset == 0 is perfectly valid on Nios II, so we have to use some |
123 | different value to mean unset l_tls_offset. */ |
124 | # define NO_TLS_OFFSET -1 |
125 | |
126 | /* Get and set the global scope generation counter in struct pthread. */ |
127 | #define THREAD_GSCOPE_FLAG_UNUSED 0 |
128 | #define THREAD_GSCOPE_FLAG_USED 1 |
129 | #define THREAD_GSCOPE_FLAG_WAIT 2 |
130 | #define THREAD_GSCOPE_RESET_FLAG() \ |
131 | do \ |
132 | { int __res \ |
133 | = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \ |
134 | THREAD_GSCOPE_FLAG_UNUSED); \ |
135 | if (__res == THREAD_GSCOPE_FLAG_WAIT) \ |
136 | lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \ |
137 | } \ |
138 | while (0) |
139 | #define THREAD_GSCOPE_SET_FLAG() \ |
140 | do \ |
141 | { \ |
142 | THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \ |
143 | atomic_write_barrier (); \ |
144 | } \ |
145 | while (0) |
146 | |
147 | #endif /* __ASSEMBLER__ */ |
148 | |
149 | #endif /* tls.h */ |
150 |
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