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, 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 #ifndef __ASSEMBLER__ 24 # include <stdbool.h> 25 # include <stddef.h> 26 # include <stdint.h> 27 28 /* Type for the dtv. */ 29 typedef union dtv 30 { 31 size_t counter; 32 struct 33 { 34 void *val; 35 bool is_static; 36 } pointer; 37 } dtv_t; 38 39 #else /* __ASSEMBLER__ */ 40 # include <tcb-offsets.h> 41 #endif /* __ASSEMBLER__ */ 42 43 /* We require TLS support in the tools. */ 44 #define HAVE_TLS_SUPPORT 1 45 #define HAVE_TLS_MODEL_ATTRIBUTE 1 46 #define HAVE___THREAD 1 47 48 /* Signal that TLS support is available. */ 49 #define USE_TLS 1 50 51 /* We require TLS support in the tools. */ 52 #ifndef HAVE_TLS_SUPPORT 53 # error "TLS support is required." 54 #endif 55 56 /* Signal that TLS support is available. */ 57 # define USE_TLS 1 58 59 #ifndef __ASSEMBLER__ 60 61 /* Get system call information. */ 62 //# include <sysdep.h> 63 64 /* The TP points to the start of the thread blocks. */ 65 # define TLS_DTV_AT_TP 1 66 67 /* We use the multiple_threads field in the pthread struct */ 68 #define TLS_MULTIPLE_THREADS_IN_TCB 1 69 70 /* Get the thread descriptor definition. */ 71 # include <../../descr.h> 72 73 /* The stack_guard is accessed directly by GCC -fstack-protector code, 74 so it is a part of public ABI. The dtv and pointer_guard fields 75 are private. */ 76 typedef struct 77 { 78 uintptr_t pointer_guard; 79 uintptr_t stack_guard; 80 dtv_t *dtv; 81 } tcbhead_t; 82 83 84 /* This is the size of the initial TCB. */ 85 # define TLS_INIT_TCB_SIZE 0 86 87 /* Alignment requirements for the initial TCB. */ 88 # define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread) 89 90 /* This is the size of the TCB. */ 91 # define TLS_TCB_SIZE 0 92 93 /* Alignment requirements for the TCB. */ 94 # define TLS_TCB_ALIGN __alignof__ (struct pthread) 95 96 /* This is the size we need before TCB. */ 97 # define TLS_PRE_TCB_SIZE \ 98 (sizeof (struct pthread) \ 99 + ((sizeof (tcbhead_t) + TLS_TCB_ALIGN - 1) & ~(TLS_TCB_ALIGN - 1))) 100 101 # ifndef __powerpc64__ 102 /* Register r2 (tp) is reserved by the ABI as "thread pointer". */ 103 register void *__thread_register __asm__ ("r2"); 104 # define PT_THREAD_POINTER PT_R2 105 # else 106 /* Register r13 (tp) is reserved by the ABI as "thread pointer". */ 107 register void *__thread_register __asm__ ("r13"); 108 # define PT_THREAD_POINTER PT_R13 109 # endif 110 111 /* The following assumes that TP (R2 or R13) points to the end of the 112 TCB + 0x7000 (per the ABI). This implies that TCB address is 113 TP - 0x7000. As we define TLS_DTV_AT_TP we can 114 assume that the pthread struct is allocated immediately ahead of the 115 TCB. This implies that the pthread_descr address is 116 TP - (TLS_PRE_TCB_SIZE + 0x7000). */ 117 # define TLS_TCB_OFFSET 0x7000 118 119 /* Install the dtv pointer. The pointer passed is to the element with 120 index -1 which contain the length. */ 121 # define INSTALL_DTV(tcbp, dtvp) \ 122 ((tcbhead_t *) (tcbp))[-1].dtv = dtvp + 1 123 124 /* Install new dtv for current thread. */ 125 # define INSTALL_NEW_DTV(dtv) (THREAD_DTV() = (dtv)) 126 127 /* Return dtv of given thread descriptor. */ 128 # define GET_DTV(tcbp) (((tcbhead_t *) (tcbp))[-1].dtv) 129 130 /* Code to initially initialize the thread pointer. This might need 131 special attention since 'errno' is not yet available and if the 132 operation can cause a failure 'errno' must not be touched. */ 133 # define TLS_INIT_TP(tcbp, secondcall) \ 134 (__thread_register = (void *) (tcbp) + TLS_TCB_OFFSET, NULL) 135 136 /* Return the address of the dtv for the current thread. */ 137 # define THREAD_DTV() \ 138 (((tcbhead_t *) (__thread_register - TLS_TCB_OFFSET))[-1].dtv) 139 140 /* Return the thread descriptor for the current thread. */ 141 # define THREAD_SELF \ 142 ((struct pthread *) (__thread_register \ 143 - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE)) 144 145 /* Magic for libthread_db to know how to do THREAD_SELF. */ 146 # define DB_THREAD_SELF \ 147 REGISTER (32, 32, PT_THREAD_POINTER * 4, \ 148 - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE) \ 149 REGISTER (64, 64, PT_THREAD_POINTER * 8, \ 150 - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE) 151 152 /* Read member of the thread descriptor directly. */ 153 # define THREAD_GETMEM(descr, member) ((void)(descr), (THREAD_SELF)->member) 154 155 /* Same as THREAD_GETMEM, but the member offset can be non-constant. */ 156 # define THREAD_GETMEM_NC(descr, member, idx) \ 157 ((void)(descr), (THREAD_SELF)->member[idx]) 158 159 /* Set member of the thread descriptor directly. */ 160 # define THREAD_SETMEM(descr, member, value) \ 161 ((void)(descr), (THREAD_SELF)->member = (value)) 162 163 /* Same as THREAD_SETMEM, but the member offset can be non-constant. */ 164 # define THREAD_SETMEM_NC(descr, member, idx, value) \ 165 ((void)(descr), (THREAD_SELF)->member[idx] = (value)) 166 167 /* Set the stack guard field in TCB head. */ 168 # define THREAD_SET_STACK_GUARD(value) \ 169 (((tcbhead_t *) ((char *) __thread_register \ 170 - TLS_TCB_OFFSET))[-1].stack_guard = (value)) 171 # define THREAD_COPY_STACK_GUARD(descr) \ 172 (((tcbhead_t *) ((char *) (descr) \ 173 + TLS_PRE_TCB_SIZE))[-1].stack_guard \ 174 = ((tcbhead_t *) ((char *) __thread_register \ 175 - TLS_TCB_OFFSET))[-1].stack_guard) 176 177 /* Set the stack guard field in TCB head. */ 178 # define THREAD_GET_POINTER_GUARD() \ 179 (((tcbhead_t *) ((char *) __thread_register \ 180 - TLS_TCB_OFFSET))[-1].pointer_guard) 181 # define THREAD_SET_POINTER_GUARD(value) \ 182 (THREAD_GET_POINTER_GUARD () = (value)) 183 # define THREAD_COPY_POINTER_GUARD(descr) \ 184 (((tcbhead_t *) ((char *) (descr) \ 185 + TLS_PRE_TCB_SIZE))[-1].pointer_guard \ 186 = THREAD_GET_POINTER_GUARD()) 187 188 /* l_tls_offset == 0 is perfectly valid on PPC, so we have to use some 189 different value to mean unset l_tls_offset. */ 190 # define NO_TLS_OFFSET -1 191 192 /* Get and set the global scope generation counter in struct pthread. */ 193 #define THREAD_GSCOPE_FLAG_UNUSED 0 194 #define THREAD_GSCOPE_FLAG_USED 1 195 #define THREAD_GSCOPE_FLAG_WAIT 2 196 #define THREAD_GSCOPE_RESET_FLAG() \ 197 do \ 198 { int __res \ 199 = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \ 200 THREAD_GSCOPE_FLAG_UNUSED); \ 201 if (__res == THREAD_GSCOPE_FLAG_WAIT) \ 202 lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \ 203 } \ 204 while (0) 205 #define THREAD_GSCOPE_SET_FLAG() \ 206 do \ 207 { \ 208 THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \ 209 atomic_write_barrier (); \ 210 } \ 211 while (0) 212 #define THREAD_GSCOPE_WAIT() \ 213 GL(dl_wait_lookup_done) () 214 215 #endif /* __ASSEMBLER__ */ 216 #endif /* tls.h */ 217