1 /* Definition for thread-local data handling. NPTL/ARM version.
2 Copyright (C) 2005,2007 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
22 #if defined USE_TLS && USE_TLS //l4
29 /* Type for the dtv. */
40 #else /* __ASSEMBLER__ */
41 # include <tcb-offsets.h>
42 #endif /* __ASSEMBLER__ */
45 /* We require TLS support in the tools. */
46 #define HAVE_TLS_SUPPORT 1
47 #define HAVE_TLS_MODEL_ATTRIBUTE 1
48 #define HAVE___THREAD 1
50 /* Signal that TLS support is available. */
55 /* Get system call information. */
58 /* The TP points to the start of the thread blocks. */
59 # define TLS_DTV_AT_TP 1
61 /* Get the thread descriptor definition. */
62 # include <../../descr.h>
70 /* This is the size of the initial TCB. */
71 # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
73 /* Alignment requirements for the initial TCB. */
74 # define TLS_INIT_TCB_ALIGN 16
76 /* This is the size of the TCB. */
77 # define TLS_TCB_SIZE sizeof (tcbhead_t)
79 /* This is the size we need before TCB. */
80 # define TLS_PRE_TCB_SIZE sizeof (struct pthread)
82 /* Alignment requirements for the TCB. */
83 # define TLS_TCB_ALIGN 16
85 /* Install the dtv pointer. The pointer passed is to the element with
86 index -1 which contain the length. */
87 # define INSTALL_DTV(tcbp, dtvp) \
88 (((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1)
90 /* Install new dtv for current thread. */
91 # define INSTALL_NEW_DTV(dtv) \
92 (THREAD_DTV() = (dtv))
94 /* Return dtv of given thread descriptor. */
95 # define GET_DTV(tcbp) \
96 (((tcbhead_t *) (tcbp))->dtv)
98 /* Code to initially initialize the thread pointer. This might need
99 special attention since 'errno' is not yet available and if the
100 operation can cause a failure 'errno' must not be touched. */
101 # define TLS_INIT_TP(tcbp, secondcall) \
102 ({ INTERNAL_SYSCALL_DECL (err); \
104 result_var = INTERNAL_SYSCALL_ARM (set_tls, err, 1, (tcbp)); \
105 INTERNAL_SYSCALL_ERROR_P (result_var, err) \
106 ? "unknown error" : NULL; })
108 /* Return the address of the dtv for the current thread. */
109 # define THREAD_DTV() \
110 (((tcbhead_t *) __builtin_thread_pointer ())->dtv)
112 /* Return the thread descriptor for the current thread. */
113 # define THREAD_SELF \
114 ((struct pthread *)__builtin_thread_pointer () - 1)
116 /* Magic for libthread_db to know how to do THREAD_SELF. */
117 # define DB_THREAD_SELF \
118 CONST_THREAD_AREA (32, sizeof (struct pthread))
120 /* Access to data in the thread descriptor is easy. */
121 #define THREAD_GETMEM(descr, member) \
123 #define THREAD_GETMEM_NC(descr, member, idx) \
125 #define THREAD_SETMEM(descr, member, value) \
126 descr->member = (value)
127 #define THREAD_SETMEM_NC(descr, member, idx, value) \
128 descr->member[idx] = (value)
130 /* Initializing the thread pointer will generate a SIGILL if the syscall
132 #define TLS_INIT_TP_EXPENSIVE 1
134 /* Get and set the global scope generation counter in struct pthread. */
135 #define THREAD_GSCOPE_FLAG_UNUSED 0
136 #define THREAD_GSCOPE_FLAG_USED 1
137 #define THREAD_GSCOPE_FLAG_WAIT 2
138 #define THREAD_GSCOPE_RESET_FLAG() \
141 = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \
142 THREAD_GSCOPE_FLAG_UNUSED); \
143 if (__res == THREAD_GSCOPE_FLAG_WAIT) \
144 lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \
147 #define THREAD_GSCOPE_SET_FLAG() \
150 THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \
151 atomic_write_barrier (); \
154 #define THREAD_GSCOPE_WAIT() \
155 GL(dl_wait_lookup_done) ()
157 #endif /* __ASSEMBLER__ */