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1 | /* Definition for thread-local data handling. NPTL/m68k version. |
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2 | Copyright (C) 2010-2024 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 | #endif /* __ASSEMBLER__ */ |
30 | |
31 | #ifndef __ASSEMBLER__ |
32 | |
33 | /* Get system call information. */ |
34 | # include <sysdep.h> |
35 | |
36 | /* The TP points to the start of the thread blocks. */ |
37 | # define TLS_DTV_AT_TP 1 |
38 | # define TLS_TCB_AT_TP 0 |
39 | |
40 | /* Get the thread descriptor definition. */ |
41 | # include <nptl/descr.h> |
42 | |
43 | typedef struct |
44 | { |
45 | dtv_t *dtv; |
46 | void *private; |
47 | } tcbhead_t; |
48 | |
49 | /* This is the size of the initial TCB. Because our TCB is before the thread |
50 | pointer, we don't need this. */ |
51 | # define TLS_INIT_TCB_SIZE 0 |
52 | |
53 | /* This is the size of the TCB. Because our TCB is before the thread |
54 | pointer, we don't need this. */ |
55 | # define TLS_TCB_SIZE 0 |
56 | |
57 | /* This is the size we need before TCB - actually, it includes the TCB. */ |
58 | # define TLS_PRE_TCB_SIZE \ |
59 | (sizeof (struct pthread) \ |
60 | + ((sizeof (tcbhead_t) + __alignof (struct pthread) - 1) \ |
61 | & ~(__alignof (struct pthread) - 1))) |
62 | |
63 | /* The thread pointer (TP) points to the end of the |
64 | TCB + 0x7000, as for PowerPC and MIPS. This implies that TCB address is |
65 | TP - 0x7000. As we define TLS_DTV_AT_TP we can |
66 | assume that the pthread struct is allocated immediately ahead of the |
67 | TCB. This implies that the pthread_descr address is |
68 | TP - (TLS_PRE_TCB_SIZE + 0x7000). */ |
69 | # define TLS_TCB_OFFSET 0x7000 |
70 | |
71 | /* Install the dtv pointer. The pointer passed is to the element with |
72 | index -1 which contain the length. */ |
73 | # define INSTALL_DTV(tcbp, dtvp) \ |
74 | ((tcbhead_t *) (tcbp))[-1].dtv = dtvp + 1 |
75 | |
76 | /* Install new dtv for current thread. */ |
77 | # define INSTALL_NEW_DTV(dtv) \ |
78 | (THREAD_DTV () = (dtv)) |
79 | |
80 | /* Return dtv of given thread descriptor. */ |
81 | # define GET_DTV(tcbp) \ |
82 | (((tcbhead_t *) (tcbp))[-1].dtv) |
83 | |
84 | /* Code to initially initialize the thread pointer. This might need |
85 | special attention since 'errno' is not yet available and if the |
86 | operation can cause a failure 'errno' must not be touched. */ |
87 | # define TLS_INIT_TP(tcbp) \ |
88 | ({ \ |
89 | int _sys_result; \ |
90 | \ |
91 | _sys_result = INTERNAL_SYSCALL_CALL (set_thread_area, \ |
92 | ((void *) (tcbp)) + TLS_TCB_OFFSET); \ |
93 | !INTERNAL_SYSCALL_ERROR_P (_sys_result); }) |
94 | |
95 | # define TLS_DEFINE_INIT_TP(tp, pd) \ |
96 | void *tp = (void *) (pd) + TLS_TCB_OFFSET + TLS_PRE_TCB_SIZE |
97 | |
98 | extern void * __m68k_read_tp (void); |
99 | |
100 | /* Return the address of the dtv for the current thread. */ |
101 | # define THREAD_DTV() \ |
102 | (((tcbhead_t *) (__m68k_read_tp () - TLS_TCB_OFFSET))[-1].dtv) |
103 | |
104 | /* Return the thread descriptor for the current thread. */ |
105 | # define THREAD_SELF \ |
106 | ((struct pthread *) (__m68k_read_tp () - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE)) |
107 | |
108 | /* Magic for libthread_db to know how to do THREAD_SELF. */ |
109 | # define DB_THREAD_SELF \ |
110 | CONST_THREAD_AREA (32, TLS_TCB_OFFSET + TLS_PRE_TCB_SIZE) |
111 | |
112 | # include <tcb-access.h> |
113 | |
114 | /* l_tls_offset == 0 is perfectly valid on M68K, so we have to use some |
115 | different value to mean unset l_tls_offset. */ |
116 | # define NO_TLS_OFFSET -1 |
117 | |
118 | /* Get and set the global scope generation counter in struct pthread. */ |
119 | #define THREAD_GSCOPE_FLAG_UNUSED 0 |
120 | #define THREAD_GSCOPE_FLAG_USED 1 |
121 | #define THREAD_GSCOPE_FLAG_WAIT 2 |
122 | #define THREAD_GSCOPE_RESET_FLAG() \ |
123 | do \ |
124 | { int __res \ |
125 | = atomic_exchange_release (&THREAD_SELF->header.gscope_flag, \ |
126 | THREAD_GSCOPE_FLAG_UNUSED); \ |
127 | if (__res == THREAD_GSCOPE_FLAG_WAIT) \ |
128 | lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \ |
129 | } \ |
130 | while (0) |
131 | #define THREAD_GSCOPE_SET_FLAG() \ |
132 | do \ |
133 | { \ |
134 | THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \ |
135 | atomic_write_barrier (); \ |
136 | } \ |
137 | while (0) |
138 | |
139 | #endif /* __ASSEMBLER__ */ |
140 | |
141 | #endif /* tls.h */ |
142 |
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