1 /* Definition for thread-local data handling. Generic version.
2 Copyright (C) 2002-2014 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/>. */
19 /* An architecture-specific version of this file has to defined a
22 TLS_TCB_AT_TP or TLS_DTV_AT_TP
24 The presence of one of these symbols signals which variant of
25 the TLS ABI is used. There are in the moment two variants
28 * the thread pointer points to a thread control block
30 * the thread pointer points to the dynamic thread vector
35 This is the size of the thread control block structure. How
36 this is actually defined depends on the ABI. The thread control
37 block could be internal descriptor of the thread library or
38 just a data structure which allows finding the DTV.
42 Similarly, but this value is only used at startup and in the
43 dynamic linker itself. There are no threads in use at that time.
48 Alignment requirements for the TCB structure.
52 Similarly, but for the structure used at startup time.
55 INSTALL_DTV(tcb, init_dtv)
57 This macro must install the given initial DTV into the thread control
58 block TCB. The normal runtime functionality must then be able to
62 TLS_INIT_TP(tcb, firstcall)
64 This macro must initialize the thread pointer to enable normal TLS
65 operation. The first parameter is a pointer to the thread control
66 block. The second parameter specifies whether this is the first
67 call for the TCB. ld.so calls this macro more than once.
72 This macro returns the address of the DTV of the current thread.
73 This normally is done using the thread register which points
74 to the dtv or the TCB (from which the DTV can found).