1 /* Definition for thread-local data handling. NPTL/PowerPC version. 2 Copyright (C) 2003, 2005, 2006, 2007 Free Software Foundation, Inc. 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, see 17 <http://www.gnu.org/licenses/>. */ 18 19 #ifndef _TLS_H 20 #define _TLS_H 1 21 22 #ifndef __ASSEMBLER__ 23 # include <stdbool.h> 24 # include <stddef.h> 25 # include <stdint.h> 26 27 /* Type for the dtv. */ 28 typedef union dtv 29 { 30 size_t counter; 31 struct 32 { 33 void *val; 34 bool is_static; 35 } pointer; 36 } dtv_t; 37 38 #else /* __ASSEMBLER__ */ 39 # include <tcb-offsets.h> 40 #endif /* __ASSEMBLER__ */ 41 42 /* We require TLS support in the tools. */ 43 #define HAVE_TLS_SUPPORT 1 44 #define HAVE_TLS_MODEL_ATTRIBUTE 1 45 #define HAVE___THREAD 1 46 47 /* Signal that TLS support is available. */ 48 #define USE_TLS 1 49 50 /* We require TLS support in the tools. */ 51 #ifndef HAVE_TLS_SUPPORT 52 # error "TLS support is required." 53 #endif 54 55 /* Signal that TLS support is available. */ 56 # define USE_TLS 1 57 58 #ifndef __ASSEMBLER__ 59 60 /* Get system call information. */ 61 # include <sysdep.h> 62 63 /* The TP points to the start of the thread blocks. */ 64 # define TLS_DTV_AT_TP 1 65 66 /* We use the multiple_threads field in the pthread struct */ 67 #define TLS_MULTIPLE_THREADS_IN_TCB 1 68 69 /* Get the thread descriptor definition. */ 70 # include <../../descr.h> 71 72 /* The stack_guard is accessed directly by GCC -fstack-protector code, 73 so it is a part of public ABI. The dtv and pointer_guard fields 74 are private. */ 75 typedef struct 76 { 77 uintptr_t pointer_guard; 78 uintptr_t stack_guard; 79 dtv_t *dtv; 80 } tcbhead_t; 81 82 /* This is the size of the initial TCB. */ 83 # define TLS_INIT_TCB_SIZE 0 84 85 /* Alignment requirements for the initial TCB. */ 86 # define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread) 87 88 /* This is the size of the TCB. */ 89 # define TLS_TCB_SIZE 0 90 91 /* Alignment requirements for the TCB. */ 92 # define TLS_TCB_ALIGN __alignof__ (struct pthread) 93 94 /* This is the size we need before TCB. */ 95 # define TLS_PRE_TCB_SIZE \ 96 (sizeof (struct pthread) \ 97 + ((sizeof (tcbhead_t) + TLS_TCB_ALIGN - 1) & ~(TLS_TCB_ALIGN - 1))) 98 99 # ifndef __powerpc64__ 100 /* Register r2 (tp) is reserved by the ABI as "thread pointer". */ 101 register void *__thread_register __asm__ ("r2"); 102 # define PT_THREAD_POINTER PT_R2 103 # else 104 /* Register r13 (tp) is reserved by the ABI as "thread pointer". */ 105 register void *__thread_register __asm__ ("r13"); 106 # define PT_THREAD_POINTER PT_R13 107 # endif 108 109 /* The following assumes that TP (R2 or R13) points to the end of the 110 TCB + 0x7000 (per the ABI). This implies that TCB address is 111 TP - 0x7000. As we define TLS_DTV_AT_TP we can 112 assume that the pthread struct is allocated immediately ahead of the 113 TCB. This implies that the pthread_descr address is 114 TP - (TLS_PRE_TCB_SIZE + 0x7000). */ 115 # define TLS_TCB_OFFSET 0x7000 116 117 /* Install the dtv pointer. The pointer passed is to the element with 118 index -1 which contain the length. */ 119 # define INSTALL_DTV(tcbp, dtvp) \ 120 ((tcbhead_t *) (tcbp))[-1].dtv = dtvp + 1 121 122 /* Install new dtv for current thread. */ 123 # define INSTALL_NEW_DTV(dtv) (THREAD_DTV() = (dtv)) 124 125 /* Return dtv of given thread descriptor. */ 126 # define GET_DTV(tcbp) (((tcbhead_t *) (tcbp))[-1].dtv) 127 128 /* Code to initially initialize the thread pointer. This might need 129 special attention since 'errno' is not yet available and if the 130 operation can cause a failure 'errno' must not be touched. */ 131 # define TLS_INIT_TP(tcbp, secondcall) \ 132 (__thread_register = (void *) (tcbp) + TLS_TCB_OFFSET, NULL) 133 134 /* Return the address of the dtv for the current thread. */ 135 # define THREAD_DTV() \ 136 (((tcbhead_t *) (__thread_register - TLS_TCB_OFFSET))[-1].dtv) 137 138 /* Return the thread descriptor for the current thread. */ 139 # define THREAD_SELF \ 140 ((struct pthread *) (__thread_register \ 141 - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE)) 142 143 /* Magic for libthread_db to know how to do THREAD_SELF. */ 144 # define DB_THREAD_SELF \ 145 REGISTER (32, 32, PT_THREAD_POINTER * 4, \ 146 - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE) \ 147 REGISTER (64, 64, PT_THREAD_POINTER * 8, \ 148 - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE) 149 150 /* Read member of the thread descriptor directly. */ 151 # define THREAD_GETMEM(descr, member) ((void)(descr), (THREAD_SELF)->member) 152 153 /* Same as THREAD_GETMEM, but the member offset can be non-constant. */ 154 # define THREAD_GETMEM_NC(descr, member, idx) \ 155 ((void)(descr), (THREAD_SELF)->member[idx]) 156 157 /* Set member of the thread descriptor directly. */ 158 # define THREAD_SETMEM(descr, member, value) \ 159 ((void)(descr), (THREAD_SELF)->member = (value)) 160 161 /* Same as THREAD_SETMEM, but the member offset can be non-constant. */ 162 # define THREAD_SETMEM_NC(descr, member, idx, value) \ 163 ((void)(descr), (THREAD_SELF)->member[idx] = (value)) 164 165 /* Set the stack guard field in TCB head. */ 166 # define THREAD_SET_STACK_GUARD(value) \ 167 (((tcbhead_t *) ((char *) __thread_register \ 168 - TLS_TCB_OFFSET))[-1].stack_guard = (value)) 169 # define THREAD_COPY_STACK_GUARD(descr) \ 170 (((tcbhead_t *) ((char *) (descr) \ 171 + TLS_PRE_TCB_SIZE))[-1].stack_guard \ 172 = ((tcbhead_t *) ((char *) __thread_register \ 173 - TLS_TCB_OFFSET))[-1].stack_guard) 174 175 /* Set the stack guard field in TCB head. */ 176 # define THREAD_GET_POINTER_GUARD() \ 177 (((tcbhead_t *) ((char *) __thread_register \ 178 - TLS_TCB_OFFSET))[-1].pointer_guard) 179 # define THREAD_SET_POINTER_GUARD(value) \ 180 (THREAD_GET_POINTER_GUARD () = (value)) 181 # define THREAD_COPY_POINTER_GUARD(descr) \ 182 (((tcbhead_t *) ((char *) (descr) \ 183 + TLS_PRE_TCB_SIZE))[-1].pointer_guard \ 184 = THREAD_GET_POINTER_GUARD()) 185 186 /* l_tls_offset == 0 is perfectly valid on PPC, so we have to use some 187 different value to mean unset l_tls_offset. */ 188 # define NO_TLS_OFFSET -1 189 190 /* Get and set the global scope generation counter in struct pthread. */ 191 #define THREAD_GSCOPE_FLAG_UNUSED 0 192 #define THREAD_GSCOPE_FLAG_USED 1 193 #define THREAD_GSCOPE_FLAG_WAIT 2 194 #define THREAD_GSCOPE_RESET_FLAG() \ 195 do \ 196 { int __res \ 197 = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \ 198 THREAD_GSCOPE_FLAG_UNUSED); \ 199 if (__res == THREAD_GSCOPE_FLAG_WAIT) \ 200 lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \ 201 } \ 202 while (0) 203 #define THREAD_GSCOPE_SET_FLAG() \ 204 do \ 205 { \ 206 THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \ 207 atomic_write_barrier (); \ 208 } \ 209 while (0) 210 #define THREAD_GSCOPE_WAIT() \ 211 GL(dl_wait_lookup_done) () 212 213 #endif /* __ASSEMBLER__ */ 214 215 #endif /* tls.h */ 216