1 /* Definition for thread-local data handling. NPTL/Alpha version.
2 Copyright (C) 2003, 2005 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, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
28 /* Type for the dtv. */
39 #else /* __ASSEMBLER__ */
40 # include <tcb-offsets.h>
41 #endif /* __ASSEMBLER__ */
44 /* We require TLS support in the tools. */
45 #ifndef HAVE_TLS_SUPPORT
46 # error "TLS support is required."
49 /* Signal that TLS support is available. */
54 /* Get system call information. */
57 /* The TP points to the start of the thread blocks. */
58 # define TLS_DTV_AT_TP 1
60 /* Get the thread descriptor definition. */
61 # include <nptl/descr.h>
69 /* This is the size of the initial TCB. */
70 # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
72 /* Alignment requirements for the initial TCB. */
73 # define TLS_INIT_TCB_ALIGN 16
75 /* This is the size of the TCB. */
76 # define TLS_TCB_SIZE sizeof (tcbhead_t)
78 /* This is the size we need before TCB. */
79 # define TLS_PRE_TCB_SIZE sizeof (struct pthread)
81 /* Alignment requirements for the TCB. */
82 # define TLS_TCB_ALIGN 16
84 /* Install the dtv pointer. The pointer passed is to the element with
85 index -1 which contain the length. */
86 # define INSTALL_DTV(tcbp, dtvp) \
87 (((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1)
89 /* Install new dtv for current thread. */
90 # define INSTALL_NEW_DTV(dtv) \
91 (THREAD_DTV() = (dtv))
93 /* Return dtv of given thread descriptor. */
94 # define GET_DTV(tcbp) \
95 (((tcbhead_t *) (tcbp))->dtv)
97 /* Code to initially initialize the thread pointer. This might need
98 special attention since 'errno' is not yet available and if the
99 operation can cause a failure 'errno' must not be touched. */
100 # define TLS_INIT_TP(tcbp, secondcall) \
101 (__builtin_set_thread_pointer ((void *)(tcbp)), NULL)
103 /* Return the address of the dtv for the current thread. */
104 # define THREAD_DTV() \
105 (((tcbhead_t *) __builtin_thread_pointer ())->dtv)
107 /* Return the thread descriptor for the current thread. */
108 # define THREAD_SELF \
109 ((struct pthread *)__builtin_thread_pointer () - 1)
111 /* Magic for libthread_db to know how to do THREAD_SELF. */
112 # define DB_THREAD_SELF \
113 REGISTER (64, 64, 32 * 8, -sizeof (struct pthread))
115 /* Access to data in the thread descriptor is easy. */
116 #define THREAD_GETMEM(descr, member) \
118 #define THREAD_GETMEM_NC(descr, member, idx) \
120 #define THREAD_SETMEM(descr, member, value) \
121 descr->member = (value)
122 #define THREAD_SETMEM_NC(descr, member, idx, value) \
123 descr->member[idx] = (value)
125 #endif /* __ASSEMBLER__ */