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1 | /* Definition for thread-local data handling. Generic version. |
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2 | Copyright (C) 2002-2022 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 | /* An architecture-specific version of this file has to defined a |
20 | number of symbols: |
21 | |
22 | TCB_ALIGNMENT |
23 | |
24 | Alignment of THREAD_SELF (struct pthread *) and the thread |
25 | pointer. |
26 | |
27 | TLS_TCB_AT_TP or TLS_DTV_AT_TP |
28 | |
29 | The presence of one of these symbols signals which variant of |
30 | the TLS ABI is used. There are in the moment two variants |
31 | available: |
32 | |
33 | * the thread pointer points to a thread control block |
34 | |
35 | * the thread pointer points to the dynamic thread vector |
36 | |
37 | |
38 | TLS_TCB_SIZE |
39 | |
40 | This is the size of the thread control block structure. How |
41 | this is actually defined depends on the ABI. The thread control |
42 | block could be internal descriptor of the thread library or |
43 | just a data structure which allows finding the DTV. |
44 | |
45 | TLS_INIT_TCB_SIZE |
46 | |
47 | Similarly, but this value is only used at startup and in the |
48 | dynamic linker itself. There are no threads in use at that time. |
49 | |
50 | |
51 | INSTALL_DTV(tcb, init_dtv) |
52 | |
53 | This macro must install the given initial DTV into the thread control |
54 | block TCB. The normal runtime functionality must then be able to |
55 | use the value. |
56 | |
57 | |
58 | TLS_INIT_TP(tcb) |
59 | |
60 | This macro must initialize the thread pointer to enable normal TLS |
61 | operation. The parameter is a pointer to the thread control block. |
62 | ld.so calls this macro once. |
63 | |
64 | |
65 | THREAD_DTV() |
66 | |
67 | This macro returns the address of the DTV of the current thread. |
68 | This normally is done using the thread register which points |
69 | to the dtv or the TCB (from which the DTV can found). |
70 | */ |
71 |
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