1 /* Definitions for thread-local data handling. NPTL/sparc version.
2 Copyright (C) 2003, 2005, 2006, 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
29 # include <bits/kernel-features.h>
31 /* Type for the dtv. */
44 void *tcb; /* Pointer to the TCB. Not necessary the
45 thread descriptor used by libpthread. */
53 uintptr_t stack_guard;
54 uintptr_t pointer_guard;
58 #ifndef __ASSUME_PRIVATE_FUTEX
63 #else /* __ASSEMBLER__ */
64 # include <tcb-offsets.h>
65 #endif /* __ASSEMBLER__ */
67 /* We require TLS support in the tools. */
68 #define HAVE_TLS_SUPPORT
69 #define HAVE___THREAD 1
70 #define HAVE_TLS_MODEL_ATTRIBUTE 1
72 /* Signal that TLS support is available. */
76 /* Get system call information. */
79 /* Get the thread descriptor definition. */
82 register struct pthread *__thread_self __asm__("%g7");
84 /* This is the size of the initial TCB. Can't be just sizeof (tcbhead_t),
85 because NPTL getpid, __libc_alloca_cutoff etc. need (almost) the whole
86 struct pthread even when not linked with -lpthread. */
87 # define TLS_INIT_TCB_SIZE sizeof (struct pthread)
89 /* Alignment requirements for the initial TCB. */
90 # define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread)
92 /* This is the size of the TCB. */
93 # define TLS_TCB_SIZE sizeof (struct pthread)
95 /* Alignment requirements for the TCB. */
96 # define TLS_TCB_ALIGN __alignof__ (struct pthread)
98 /* The TCB can have any size and the memory following the address the
99 thread pointer points to is unspecified. Allocate the TCB there. */
100 # define TLS_TCB_AT_TP 1
102 /* Install the dtv pointer. The pointer passed is to the element with
103 index -1 which contain the length. */
104 # define INSTALL_DTV(descr, dtvp) \
105 ((tcbhead_t *) (descr))->dtv = (dtvp) + 1
107 /* Install new dtv for current thread. */
108 # define INSTALL_NEW_DTV(DTV) \
109 (((tcbhead_t *) __thread_self)->dtv = (DTV))
111 /* Return dtv of given thread descriptor. */
112 # define GET_DTV(descr) \
113 (((tcbhead_t *) (descr))->dtv)
115 /* Code to initially initialize the thread pointer. */
116 # define TLS_INIT_TP(descr, secondcall) \
117 (__thread_self = (__typeof (__thread_self)) (descr), NULL)
119 /* Return the address of the dtv for the current thread. */
120 # define THREAD_DTV() \
121 (((tcbhead_t *) __thread_self)->dtv)
123 /* Return the thread descriptor for the current thread. */
124 #define THREAD_SELF __thread_self
126 /* Magic for libthread_db to know how to do THREAD_SELF. */
127 # define DB_THREAD_SELF_INCLUDE <sys/ucontext.h>
128 # define DB_THREAD_SELF \
129 REGISTER (32, 32, REG_G7 * 4, 0) REGISTER (64, 64, REG_G7 * 8, 0)
131 /* Access to data in the thread descriptor is easy. */
132 #define THREAD_GETMEM(descr, member) \
134 #define THREAD_GETMEM_NC(descr, member, idx) \
136 #define THREAD_SETMEM(descr, member, value) \
137 descr->member = (value)
138 #define THREAD_SETMEM_NC(descr, member, idx, value) \
139 descr->member[idx] = (value)
141 /* Set the stack guard field in TCB head. */
142 #define THREAD_SET_STACK_GUARD(value) \
143 THREAD_SETMEM (THREAD_SELF, header.stack_guard, value)
144 # define THREAD_COPY_STACK_GUARD(descr) \
145 ((descr)->header.stack_guard \
146 = THREAD_GETMEM (THREAD_SELF, header.stack_guard))
148 /* Get/set the stack guard field in TCB head. */
149 #define THREAD_GET_POINTER_GUARD() \
150 THREAD_GETMEM (THREAD_SELF, header.pointer_guard)
151 #define THREAD_SET_POINTER_GUARD(value) \
152 THREAD_SETMEM (THREAD_SELF, header.pointer_guard, value)
153 # define THREAD_COPY_POINTER_GUARD(descr) \
154 ((descr)->header.pointer_guard = THREAD_GET_POINTER_GUARD ())
156 /* Get and set the global scope generation counter in struct pthread. */
157 #define THREAD_GSCOPE_FLAG_UNUSED 0
158 #define THREAD_GSCOPE_FLAG_USED 1
159 #define THREAD_GSCOPE_FLAG_WAIT 2
160 #define THREAD_GSCOPE_RESET_FLAG() \
163 = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \
164 THREAD_GSCOPE_FLAG_UNUSED); \
165 if (__res == THREAD_GSCOPE_FLAG_WAIT) \
166 lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \
169 #define THREAD_GSCOPE_SET_FLAG() \
172 THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \
173 atomic_write_barrier (); \
176 #define THREAD_GSCOPE_WAIT() \
177 GL(dl_wait_lookup_done) ()
179 #endif /* !ASSEMBLER */