1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
|
/* Definition for thread-local data handling. NPTL/PowerPC version.
Copyright (C) 2003, 2005, 2006, 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#ifndef _TLS_H
#define _TLS_H 1
# include <dl-sysdep.h>
#ifndef __ASSEMBLER__
# include <stdbool.h>
# include <stddef.h>
# include <stdint.h>
/* Type for the dtv. */
typedef union dtv
{
size_t counter;
struct
{
void *val;
bool is_static;
} pointer;
} dtv_t;
#else /* __ASSEMBLER__ */
# include <tcb-offsets.h>
#endif /* __ASSEMBLER__ */
/* We require TLS support in the tools. */
#ifndef HAVE_TLS_SUPPORT
# error "TLS support is required."
#endif
#ifndef __ASSEMBLER__
/* Get system call information. */
# include <sysdep.h>
/* The TP points to the start of the thread blocks. */
# define TLS_DTV_AT_TP 1
/* We use the multiple_threads field in the pthread struct */
#define TLS_MULTIPLE_THREADS_IN_TCB 1
/* Get the thread descriptor definition. */
# include <nptl/descr.h>
/* The stack_guard is accessed directly by GCC -fstack-protector code,
so it is a part of public ABI. The dtv and pointer_guard fields
are private. */
typedef struct
{
uintptr_t pointer_guard;
uintptr_t stack_guard;
dtv_t *dtv;
} tcbhead_t;
/* This is the size of the initial TCB. */
# define TLS_INIT_TCB_SIZE 0
/* Alignment requirements for the initial TCB. */
# define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread)
/* This is the size of the TCB. */
# define TLS_TCB_SIZE 0
/* Alignment requirements for the TCB. */
# define TLS_TCB_ALIGN __alignof__ (struct pthread)
/* This is the size we need before TCB. */
# define TLS_PRE_TCB_SIZE \
(sizeof (struct pthread) \
+ ((sizeof (tcbhead_t) + TLS_TCB_ALIGN - 1) & ~(TLS_TCB_ALIGN - 1)))
# ifndef __powerpc64__
/* Register r2 (tp) is reserved by the ABI as "thread pointer". */
register void *__thread_register __asm__ ("r2");
# define PT_THREAD_POINTER PT_R2
# else
/* Register r13 (tp) is reserved by the ABI as "thread pointer". */
register void *__thread_register __asm__ ("r13");
# define PT_THREAD_POINTER PT_R13
# endif
/* The following assumes that TP (R2 or R13) points to the end of the
TCB + 0x7000 (per the ABI). This implies that TCB address is
TP - 0x7000. As we define TLS_DTV_AT_TP we can
assume that the pthread struct is allocated immediately ahead of the
TCB. This implies that the pthread_descr address is
TP - (TLS_PRE_TCB_SIZE + 0x7000). */
# define TLS_TCB_OFFSET 0x7000
/* Install the dtv pointer. The pointer passed is to the element with
index -1 which contain the length. */
# define INSTALL_DTV(tcbp, dtvp) \
((tcbhead_t *) (tcbp))[-1].dtv = dtvp + 1
/* Install new dtv for current thread. */
# define INSTALL_NEW_DTV(dtv) (THREAD_DTV() = (dtv))
/* Return dtv of given thread descriptor. */
# define GET_DTV(tcbp) (((tcbhead_t *) (tcbp))[-1].dtv)
/* Code to initially initialize the thread pointer. This might need
special attention since 'errno' is not yet available and if the
operation can cause a failure 'errno' must not be touched. */
# define TLS_INIT_TP(tcbp, secondcall) \
(__thread_register = (void *) (tcbp) + TLS_TCB_OFFSET, NULL)
/* Return the address of the dtv for the current thread. */
# define THREAD_DTV() \
(((tcbhead_t *) (__thread_register - TLS_TCB_OFFSET))[-1].dtv)
/* Return the thread descriptor for the current thread. */
# define THREAD_SELF \
((struct pthread *) (__thread_register \
- TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE))
/* Magic for libthread_db to know how to do THREAD_SELF. */
# define DB_THREAD_SELF \
REGISTER (32, 32, PT_THREAD_POINTER * 4, \
- TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE) \
REGISTER (64, 64, PT_THREAD_POINTER * 8, \
- TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE)
/* Read member of the thread descriptor directly. */
# define THREAD_GETMEM(descr, member) ((void)(descr), (THREAD_SELF)->member)
/* Same as THREAD_GETMEM, but the member offset can be non-constant. */
# define THREAD_GETMEM_NC(descr, member, idx) \
((void)(descr), (THREAD_SELF)->member[idx])
/* Set member of the thread descriptor directly. */
# define THREAD_SETMEM(descr, member, value) \
((void)(descr), (THREAD_SELF)->member = (value))
/* Same as THREAD_SETMEM, but the member offset can be non-constant. */
# define THREAD_SETMEM_NC(descr, member, idx, value) \
((void)(descr), (THREAD_SELF)->member[idx] = (value))
/* Set the stack guard field in TCB head. */
# define THREAD_SET_STACK_GUARD(value) \
(((tcbhead_t *) ((char *) __thread_register \
- TLS_TCB_OFFSET))[-1].stack_guard = (value))
# define THREAD_COPY_STACK_GUARD(descr) \
(((tcbhead_t *) ((char *) (descr) \
+ TLS_PRE_TCB_SIZE))[-1].stack_guard \
= ((tcbhead_t *) ((char *) __thread_register \
- TLS_TCB_OFFSET))[-1].stack_guard)
/* Set the stack guard field in TCB head. */
# define THREAD_GET_POINTER_GUARD() \
(((tcbhead_t *) ((char *) __thread_register \
- TLS_TCB_OFFSET))[-1].pointer_guard)
# define THREAD_SET_POINTER_GUARD(value) \
(THREAD_GET_POINTER_GUARD () = (value))
# define THREAD_COPY_POINTER_GUARD(descr) \
(((tcbhead_t *) ((char *) (descr) \
+ TLS_PRE_TCB_SIZE))[-1].pointer_guard \
= THREAD_GET_POINTER_GUARD())
/* l_tls_offset == 0 is perfectly valid on PPC, so we have to use some
different value to mean unset l_tls_offset. */
# define NO_TLS_OFFSET -1
/* Get and set the global scope generation counter in struct pthread. */
#define THREAD_GSCOPE_FLAG_UNUSED 0
#define THREAD_GSCOPE_FLAG_USED 1
#define THREAD_GSCOPE_FLAG_WAIT 2
#define THREAD_GSCOPE_RESET_FLAG() \
do \
{ int __res \
= atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \
THREAD_GSCOPE_FLAG_UNUSED); \
if (__res == THREAD_GSCOPE_FLAG_WAIT) \
lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1); \
} \
while (0)
#define THREAD_GSCOPE_SET_FLAG() \
do \
{ \
THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \
atomic_write_barrier (); \
} \
while (0)
#define THREAD_GSCOPE_WAIT() \
GL(dl_wait_lookup_done) ()
#endif /* __ASSEMBLER__ */
#endif /* tls.h */
|
