1 /* Copyright (C) 2005-2014 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 License as
7 published by the Free Software Foundation; either version 2.1 of the
8 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/>. */
22 #include <dl-sysdep.h>
29 /* Type for the dtv. */
40 #else /* __ASSEMBLER__ */
41 # include <tcb-offsets.h>
42 #endif /* __ASSEMBLER__ */
46 /* Get system call information. */
49 /* The TP points to the start of the thread blocks. */
50 # define TLS_DTV_AT_TP 1
52 /* Get the thread descriptor definition. */
53 # include <nptl/descr.h>
61 /* This is the size of the initial TCB. */
62 # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
64 /* Alignment requirements for the initial TCB. */
65 # define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t)
67 /* This is the size of the TCB. */
68 # define TLS_TCB_SIZE sizeof (tcbhead_t)
70 /* This is the size we need before TCB. */
71 # define TLS_PRE_TCB_SIZE sizeof (struct pthread)
73 /* Alignment requirements for the TCB. */
74 # define TLS_TCB_ALIGN __alignof__ (tcbhead_t)
76 /* Install the dtv pointer. The pointer passed is to the element with
77 index -1 which contain the length. */
78 # define INSTALL_DTV(tcbp, dtvp) \
79 (((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1)
81 /* Install new dtv for current thread. */
82 # define INSTALL_NEW_DTV(dtv) \
83 (THREAD_DTV() = (dtv))
85 /* Return dtv of given thread descriptor. */
86 # define GET_DTV(tcbp) \
87 (((tcbhead_t *) (tcbp))->dtv)
89 /* Code to initially initialize the thread pointer. This might need
90 special attention since 'errno' is not yet available and if the
91 operation can cause a failure 'errno' must not be touched. */
92 # define TLS_INIT_TP(tcbp, secondcall) \
93 ({ __asm __volatile ("msr tpidr_el0, %0" : : "r" (tcbp)); NULL; })
95 /* Return the address of the dtv for the current thread. */
96 # define THREAD_DTV() \
97 (((tcbhead_t *) __builtin_thread_pointer ())->dtv)
99 /* Return the thread descriptor for the current thread. */
100 # define THREAD_SELF \
101 ((struct pthread *)__builtin_thread_pointer () - 1)
103 /* Magic for libthread_db to know how to do THREAD_SELF. */
104 # define DB_THREAD_SELF \
105 CONST_THREAD_AREA (64, sizeof (struct pthread))
107 /* Access to data in the thread descriptor is easy. */
108 # define THREAD_GETMEM(descr, member) \
110 # define THREAD_GETMEM_NC(descr, member, idx) \
112 # define THREAD_SETMEM(descr, member, value) \
113 descr->member = (value)
114 # define THREAD_SETMEM_NC(descr, member, idx, value) \
115 descr->member[idx] = (value)
117 /* Get and set the global scope generation counter in struct pthread. */
118 # define THREAD_GSCOPE_FLAG_UNUSED 0
119 # define THREAD_GSCOPE_FLAG_USED 1
120 # define THREAD_GSCOPE_FLAG_WAIT 2
121 # define THREAD_GSCOPE_RESET_FLAG() \
124 = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \
125 THREAD_GSCOPE_FLAG_UNUSED); \
126 if (__res == THREAD_GSCOPE_FLAG_WAIT) \
127 lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \
130 # define THREAD_GSCOPE_SET_FLAG() \
133 THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \
134 atomic_write_barrier (); \
137 # define THREAD_GSCOPE_WAIT() \
138 GL(dl_wait_lookup_done) ()
140 # endif /* __ASSEMBLER__ */