]>
Commit | Line | Data |
---|---|---|
f3c13160 | 1 | /* Definition for thread-local data handling. NPTL/PowerPC version. |
568035b7 | 2 | Copyright (C) 2003-2013 Free Software Foundation, Inc. |
f3c13160 RM |
3 | This file is part of the GNU C Library. |
4 | ||
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. | |
9 | ||
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. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
f3c13160 RM |
18 | |
19 | #ifndef _TLS_H | |
20 | #define _TLS_H 1 | |
21 | ||
22 | # include <dl-sysdep.h> | |
23 | ||
24 | #ifndef __ASSEMBLER__ | |
9dcafc55 | 25 | # include <stdbool.h> |
f3c13160 RM |
26 | # include <stddef.h> |
27 | # include <stdint.h> | |
28 | ||
29 | /* Type for the dtv. */ | |
30 | typedef union dtv | |
31 | { | |
32 | size_t counter; | |
9dcafc55 UD |
33 | struct |
34 | { | |
35 | void *val; | |
36 | bool is_static; | |
37 | } pointer; | |
f3c13160 RM |
38 | } dtv_t; |
39 | ||
40 | #else /* __ASSEMBLER__ */ | |
41 | # include <tcb-offsets.h> | |
42 | #endif /* __ASSEMBLER__ */ | |
43 | ||
44 | ||
f3c13160 RM |
45 | #ifndef __ASSEMBLER__ |
46 | ||
47 | /* Get system call information. */ | |
48 | # include <sysdep.h> | |
49 | ||
50 | /* The TP points to the start of the thread blocks. */ | |
51 | # define TLS_DTV_AT_TP 1 | |
52 | ||
94659495 RM |
53 | /* We use the multiple_threads field in the pthread struct */ |
54 | #define TLS_MULTIPLE_THREADS_IN_TCB 1 | |
f3c13160 RM |
55 | |
56 | /* Get the thread descriptor definition. */ | |
57 | # include <nptl/descr.h> | |
58 | ||
35f1e827 | 59 | /* The stack_guard is accessed directly by GCC -fstack-protector code, |
991fa82b UD |
60 | so it is a part of public ABI. The dtv and pointer_guard fields |
61 | are private. */ | |
f3c13160 RM |
62 | typedef struct |
63 | { | |
e55a9b25 AZ |
64 | /* Reservation for the Event-Based Branching ABI. */ |
65 | uintptr_t ebb_handler; | |
66 | uintptr_t ebb_ctx_pointer; | |
67 | uintptr_t ebb_reserved1; | |
68 | uintptr_t ebb_reserved2; | |
00c2b3b9 | 69 | uintptr_t pointer_guard; |
35f1e827 | 70 | uintptr_t stack_guard; |
f3c13160 RM |
71 | dtv_t *dtv; |
72 | } tcbhead_t; | |
73 | ||
74 | /* This is the size of the initial TCB. */ | |
299601a1 | 75 | # define TLS_INIT_TCB_SIZE 0 |
f3c13160 RM |
76 | |
77 | /* Alignment requirements for the initial TCB. */ | |
299601a1 | 78 | # define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread) |
f3c13160 RM |
79 | |
80 | /* This is the size of the TCB. */ | |
299601a1 | 81 | # define TLS_TCB_SIZE 0 |
f3c13160 RM |
82 | |
83 | /* Alignment requirements for the TCB. */ | |
299601a1 | 84 | # define TLS_TCB_ALIGN __alignof__ (struct pthread) |
f3c13160 RM |
85 | |
86 | /* This is the size we need before TCB. */ | |
468777e1 UD |
87 | # define TLS_PRE_TCB_SIZE \ |
88 | (sizeof (struct pthread) \ | |
89 | + ((sizeof (tcbhead_t) + TLS_TCB_ALIGN - 1) & ~(TLS_TCB_ALIGN - 1))) | |
f3c13160 RM |
90 | |
91 | # ifndef __powerpc64__ | |
92 | /* Register r2 (tp) is reserved by the ABI as "thread pointer". */ | |
93 | register void *__thread_register __asm__ ("r2"); | |
94 | # define PT_THREAD_POINTER PT_R2 | |
95 | # else | |
96 | /* Register r13 (tp) is reserved by the ABI as "thread pointer". */ | |
97 | register void *__thread_register __asm__ ("r13"); | |
98 | # define PT_THREAD_POINTER PT_R13 | |
99 | # endif | |
100 | ||
101 | /* The following assumes that TP (R2 or R13) points to the end of the | |
102 | TCB + 0x7000 (per the ABI). This implies that TCB address is | |
299601a1 | 103 | TP - 0x7000. As we define TLS_DTV_AT_TP we can |
f3c13160 RM |
104 | assume that the pthread struct is allocated immediately ahead of the |
105 | TCB. This implies that the pthread_descr address is | |
299601a1 | 106 | TP - (TLS_PRE_TCB_SIZE + 0x7000). */ |
f3c13160 RM |
107 | # define TLS_TCB_OFFSET 0x7000 |
108 | ||
109 | /* Install the dtv pointer. The pointer passed is to the element with | |
110 | index -1 which contain the length. */ | |
111 | # define INSTALL_DTV(tcbp, dtvp) \ | |
299601a1 | 112 | ((tcbhead_t *) (tcbp))[-1].dtv = dtvp + 1 |
f3c13160 RM |
113 | |
114 | /* Install new dtv for current thread. */ | |
115 | # define INSTALL_NEW_DTV(dtv) (THREAD_DTV() = (dtv)) | |
116 | ||
117 | /* Return dtv of given thread descriptor. */ | |
299601a1 | 118 | # define GET_DTV(tcbp) (((tcbhead_t *) (tcbp))[-1].dtv) |
f3c13160 RM |
119 | |
120 | /* Code to initially initialize the thread pointer. This might need | |
121 | special attention since 'errno' is not yet available and if the | |
122 | operation can cause a failure 'errno' must not be touched. */ | |
123 | # define TLS_INIT_TP(tcbp, secondcall) \ | |
299601a1 | 124 | (__thread_register = (void *) (tcbp) + TLS_TCB_OFFSET, NULL) |
f3c13160 RM |
125 | |
126 | /* Return the address of the dtv for the current thread. */ | |
127 | # define THREAD_DTV() \ | |
35f1e827 | 128 | (((tcbhead_t *) (__thread_register - TLS_TCB_OFFSET))[-1].dtv) |
f3c13160 RM |
129 | |
130 | /* Return the thread descriptor for the current thread. */ | |
131 | # define THREAD_SELF \ | |
132 | ((struct pthread *) (__thread_register \ | |
299601a1 | 133 | - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE)) |
f3c13160 | 134 | |
7f08f55a RM |
135 | /* Magic for libthread_db to know how to do THREAD_SELF. */ |
136 | # define DB_THREAD_SELF \ | |
35f1e827 | 137 | REGISTER (32, 32, PT_THREAD_POINTER * 4, \ |
7f08f55a | 138 | - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE) \ |
35f1e827 | 139 | REGISTER (64, 64, PT_THREAD_POINTER * 8, \ |
7f08f55a RM |
140 | - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE) |
141 | ||
f3c13160 RM |
142 | /* Read member of the thread descriptor directly. */ |
143 | # define THREAD_GETMEM(descr, member) ((void)(descr), (THREAD_SELF)->member) | |
144 | ||
145 | /* Same as THREAD_GETMEM, but the member offset can be non-constant. */ | |
146 | # define THREAD_GETMEM_NC(descr, member, idx) \ | |
147 | ((void)(descr), (THREAD_SELF)->member[idx]) | |
148 | ||
149 | /* Set member of the thread descriptor directly. */ | |
150 | # define THREAD_SETMEM(descr, member, value) \ | |
151 | ((void)(descr), (THREAD_SELF)->member = (value)) | |
152 | ||
153 | /* Same as THREAD_SETMEM, but the member offset can be non-constant. */ | |
154 | # define THREAD_SETMEM_NC(descr, member, idx, value) \ | |
155 | ((void)(descr), (THREAD_SELF)->member[idx] = (value)) | |
156 | ||
35f1e827 UD |
157 | /* Set the stack guard field in TCB head. */ |
158 | # define THREAD_SET_STACK_GUARD(value) \ | |
159 | (((tcbhead_t *) ((char *) __thread_register \ | |
160 | - TLS_TCB_OFFSET))[-1].stack_guard = (value)) | |
161 | # define THREAD_COPY_STACK_GUARD(descr) \ | |
162 | (((tcbhead_t *) ((char *) (descr) \ | |
163 | + TLS_PRE_TCB_SIZE))[-1].stack_guard \ | |
164 | = ((tcbhead_t *) ((char *) __thread_register \ | |
165 | - TLS_TCB_OFFSET))[-1].stack_guard) | |
166 | ||
00c2b3b9 UD |
167 | /* Set the stack guard field in TCB head. */ |
168 | # define THREAD_GET_POINTER_GUARD() \ | |
169 | (((tcbhead_t *) ((char *) __thread_register \ | |
170 | - TLS_TCB_OFFSET))[-1].pointer_guard) | |
171 | # define THREAD_SET_POINTER_GUARD(value) \ | |
172 | (THREAD_GET_POINTER_GUARD () = (value)) | |
173 | # define THREAD_COPY_POINTER_GUARD(descr) \ | |
174 | (((tcbhead_t *) ((char *) (descr) \ | |
175 | + TLS_PRE_TCB_SIZE))[-1].pointer_guard \ | |
176 | = THREAD_GET_POINTER_GUARD()) | |
177 | ||
299601a1 UD |
178 | /* l_tls_offset == 0 is perfectly valid on PPC, so we have to use some |
179 | different value to mean unset l_tls_offset. */ | |
180 | # define NO_TLS_OFFSET -1 | |
181 | ||
991fa82b | 182 | /* Get and set the global scope generation counter in struct pthread. */ |
0a54ab53 UD |
183 | #define THREAD_GSCOPE_FLAG_UNUSED 0 |
184 | #define THREAD_GSCOPE_FLAG_USED 1 | |
185 | #define THREAD_GSCOPE_FLAG_WAIT 2 | |
0a54ab53 UD |
186 | #define THREAD_GSCOPE_RESET_FLAG() \ |
187 | do \ | |
188 | { int __res \ | |
991fa82b | 189 | = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \ |
0a54ab53 UD |
190 | THREAD_GSCOPE_FLAG_UNUSED); \ |
191 | if (__res == THREAD_GSCOPE_FLAG_WAIT) \ | |
085a4412 | 192 | lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \ |
0a54ab53 UD |
193 | } \ |
194 | while (0) | |
195 | #define THREAD_GSCOPE_SET_FLAG() \ | |
991fa82b UD |
196 | do \ |
197 | { \ | |
198 | THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \ | |
199 | atomic_write_barrier (); \ | |
200 | } \ | |
201 | while (0) | |
0a54ab53 UD |
202 | #define THREAD_GSCOPE_WAIT() \ |
203 | GL(dl_wait_lookup_done) () | |
204 | ||
f3c13160 RM |
205 | #endif /* __ASSEMBLER__ */ |
206 | ||
207 | #endif /* tls.h */ |