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f3c13160 | 1 | /* Definition for thread-local data handling. NPTL/PowerPC version. |
9dcafc55 | 2 | Copyright (C) 2003, 2005 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 | |
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 | |
18 | 02111-1307 USA. */ | |
19 | ||
20 | #ifndef _TLS_H | |
21 | #define _TLS_H 1 | |
22 | ||
23 | # include <dl-sysdep.h> | |
24 | ||
25 | #ifndef __ASSEMBLER__ | |
9dcafc55 | 26 | # include <stdbool.h> |
f3c13160 RM |
27 | # include <stddef.h> |
28 | # include <stdint.h> | |
29 | ||
30 | /* Type for the dtv. */ | |
31 | typedef union dtv | |
32 | { | |
33 | size_t counter; | |
9dcafc55 UD |
34 | struct |
35 | { | |
36 | void *val; | |
37 | bool is_static; | |
38 | } pointer; | |
f3c13160 RM |
39 | } dtv_t; |
40 | ||
41 | #else /* __ASSEMBLER__ */ | |
42 | # include <tcb-offsets.h> | |
43 | #endif /* __ASSEMBLER__ */ | |
44 | ||
45 | ||
46 | /* We require TLS support in the tools. */ | |
47 | #ifndef HAVE_TLS_SUPPORT | |
48 | # error "TLS support is required." | |
49 | #endif | |
50 | ||
51 | /* Signal that TLS support is available. */ | |
52 | # define USE_TLS 1 | |
53 | ||
54 | #ifndef __ASSEMBLER__ | |
55 | ||
56 | /* Get system call information. */ | |
57 | # include <sysdep.h> | |
58 | ||
59 | /* The TP points to the start of the thread blocks. */ | |
60 | # define TLS_DTV_AT_TP 1 | |
61 | ||
94659495 RM |
62 | /* We use the multiple_threads field in the pthread struct */ |
63 | #define TLS_MULTIPLE_THREADS_IN_TCB 1 | |
f3c13160 RM |
64 | |
65 | /* Get the thread descriptor definition. */ | |
66 | # include <nptl/descr.h> | |
67 | ||
35f1e827 UD |
68 | /* The stack_guard is accessed directly by GCC -fstack-protector code, |
69 | so it is a part of public ABI. The dtv field is private. */ | |
f3c13160 RM |
70 | typedef struct |
71 | { | |
35f1e827 | 72 | uintptr_t stack_guard; |
f3c13160 RM |
73 | dtv_t *dtv; |
74 | } tcbhead_t; | |
75 | ||
76 | /* This is the size of the initial TCB. */ | |
299601a1 | 77 | # define TLS_INIT_TCB_SIZE 0 |
f3c13160 RM |
78 | |
79 | /* Alignment requirements for the initial TCB. */ | |
299601a1 | 80 | # define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread) |
f3c13160 RM |
81 | |
82 | /* This is the size of the TCB. */ | |
299601a1 | 83 | # define TLS_TCB_SIZE 0 |
f3c13160 RM |
84 | |
85 | /* Alignment requirements for the TCB. */ | |
299601a1 | 86 | # define TLS_TCB_ALIGN __alignof__ (struct pthread) |
f3c13160 RM |
87 | |
88 | /* This is the size we need before TCB. */ | |
468777e1 UD |
89 | # define TLS_PRE_TCB_SIZE \ |
90 | (sizeof (struct pthread) \ | |
91 | + ((sizeof (tcbhead_t) + TLS_TCB_ALIGN - 1) & ~(TLS_TCB_ALIGN - 1))) | |
f3c13160 RM |
92 | |
93 | # ifndef __powerpc64__ | |
94 | /* Register r2 (tp) is reserved by the ABI as "thread pointer". */ | |
95 | register void *__thread_register __asm__ ("r2"); | |
96 | # define PT_THREAD_POINTER PT_R2 | |
97 | # else | |
98 | /* Register r13 (tp) is reserved by the ABI as "thread pointer". */ | |
99 | register void *__thread_register __asm__ ("r13"); | |
100 | # define PT_THREAD_POINTER PT_R13 | |
101 | # endif | |
102 | ||
103 | /* The following assumes that TP (R2 or R13) points to the end of the | |
104 | TCB + 0x7000 (per the ABI). This implies that TCB address is | |
299601a1 | 105 | TP - 0x7000. As we define TLS_DTV_AT_TP we can |
f3c13160 RM |
106 | assume that the pthread struct is allocated immediately ahead of the |
107 | TCB. This implies that the pthread_descr address is | |
299601a1 | 108 | TP - (TLS_PRE_TCB_SIZE + 0x7000). */ |
f3c13160 RM |
109 | # define TLS_TCB_OFFSET 0x7000 |
110 | ||
111 | /* Install the dtv pointer. The pointer passed is to the element with | |
112 | index -1 which contain the length. */ | |
113 | # define INSTALL_DTV(tcbp, dtvp) \ | |
299601a1 | 114 | ((tcbhead_t *) (tcbp))[-1].dtv = dtvp + 1 |
f3c13160 RM |
115 | |
116 | /* Install new dtv for current thread. */ | |
117 | # define INSTALL_NEW_DTV(dtv) (THREAD_DTV() = (dtv)) | |
118 | ||
119 | /* Return dtv of given thread descriptor. */ | |
299601a1 | 120 | # define GET_DTV(tcbp) (((tcbhead_t *) (tcbp))[-1].dtv) |
f3c13160 RM |
121 | |
122 | /* Code to initially initialize the thread pointer. This might need | |
123 | special attention since 'errno' is not yet available and if the | |
124 | operation can cause a failure 'errno' must not be touched. */ | |
125 | # define TLS_INIT_TP(tcbp, secondcall) \ | |
299601a1 | 126 | (__thread_register = (void *) (tcbp) + TLS_TCB_OFFSET, NULL) |
f3c13160 RM |
127 | |
128 | /* Return the address of the dtv for the current thread. */ | |
129 | # define THREAD_DTV() \ | |
35f1e827 | 130 | (((tcbhead_t *) (__thread_register - TLS_TCB_OFFSET))[-1].dtv) |
f3c13160 RM |
131 | |
132 | /* Return the thread descriptor for the current thread. */ | |
133 | # define THREAD_SELF \ | |
134 | ((struct pthread *) (__thread_register \ | |
299601a1 | 135 | - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE)) |
f3c13160 | 136 | |
7f08f55a RM |
137 | /* Magic for libthread_db to know how to do THREAD_SELF. */ |
138 | # define DB_THREAD_SELF \ | |
35f1e827 | 139 | REGISTER (32, 32, PT_THREAD_POINTER * 4, \ |
7f08f55a | 140 | - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE) \ |
35f1e827 | 141 | REGISTER (64, 64, PT_THREAD_POINTER * 8, \ |
7f08f55a RM |
142 | - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE) |
143 | ||
f3c13160 RM |
144 | /* Read member of the thread descriptor directly. */ |
145 | # define THREAD_GETMEM(descr, member) ((void)(descr), (THREAD_SELF)->member) | |
146 | ||
147 | /* Same as THREAD_GETMEM, but the member offset can be non-constant. */ | |
148 | # define THREAD_GETMEM_NC(descr, member, idx) \ | |
149 | ((void)(descr), (THREAD_SELF)->member[idx]) | |
150 | ||
151 | /* Set member of the thread descriptor directly. */ | |
152 | # define THREAD_SETMEM(descr, member, value) \ | |
153 | ((void)(descr), (THREAD_SELF)->member = (value)) | |
154 | ||
155 | /* Same as THREAD_SETMEM, but the member offset can be non-constant. */ | |
156 | # define THREAD_SETMEM_NC(descr, member, idx, value) \ | |
157 | ((void)(descr), (THREAD_SELF)->member[idx] = (value)) | |
158 | ||
35f1e827 UD |
159 | /* Set the stack guard field in TCB head. */ |
160 | # define THREAD_SET_STACK_GUARD(value) \ | |
161 | (((tcbhead_t *) ((char *) __thread_register \ | |
162 | - TLS_TCB_OFFSET))[-1].stack_guard = (value)) | |
163 | # define THREAD_COPY_STACK_GUARD(descr) \ | |
164 | (((tcbhead_t *) ((char *) (descr) \ | |
165 | + TLS_PRE_TCB_SIZE))[-1].stack_guard \ | |
166 | = ((tcbhead_t *) ((char *) __thread_register \ | |
167 | - TLS_TCB_OFFSET))[-1].stack_guard) | |
168 | ||
299601a1 UD |
169 | /* l_tls_offset == 0 is perfectly valid on PPC, so we have to use some |
170 | different value to mean unset l_tls_offset. */ | |
171 | # define NO_TLS_OFFSET -1 | |
172 | ||
f3c13160 RM |
173 | #endif /* __ASSEMBLER__ */ |
174 | ||
175 | #endif /* tls.h */ |