1 /* Definition for thread-local data handling. NPTL/SH 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 21 22 #ifndef __ASSEMBLER__ 23 # include <stdbool.h> 24 # include <stddef.h> 25 # include <stdint.h> 26 # include <stdlib.h> 27 # include <list.h> 28 # include <sysdep.h> 29 # include <bits/kernel-features.h> 30 31 /* Type for the dtv. */ 32 typedef union dtv 33 { 34 size_t counter; 35 struct 36 { 37 void *val; 38 bool is_static; 39 } pointer; 40 } dtv_t; 41 42 typedef struct 43 { 44 dtv_t *dtv; 45 uintptr_t pointer_guard; 46 } tcbhead_t; 47 48 # define TLS_MULTIPLE_THREADS_IN_TCB 1 49 50 #else /* __ASSEMBLER__ */ 51 # include <tcb-offsets.h> 52 #endif /* __ASSEMBLER__ */ 53 54 55 /* We require TLS support in the tools. */ 56 #define HAVE_TLS_SUPPORT 57 #define HAVE___THREAD 1 58 #define HAVE_TLS_MODEL_ATTRIBUTE 1 59 /* Signal that TLS support is available. */ 60 # define USE_TLS 1 61 62 #ifndef __ASSEMBLER__ 63 64 /* Get system call information. */ 65 # include <sysdep.h> 66 67 /* This is the size of the initial TCB. */ 68 # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t) 69 70 /* Alignment requirements for the initial TCB. */ 71 # define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t) 72 73 /* This is the size of the TCB. */ 74 # define TLS_TCB_SIZE sizeof (tcbhead_t) 75 76 /* This is the size we need before TCB. */ 77 # define TLS_PRE_TCB_SIZE sizeof (struct pthread) 78 79 /* Alignment requirements for the TCB. */ 80 # define TLS_TCB_ALIGN __alignof__ (struct pthread) 81 82 /* The TLS blocks start right after the TCB. */ 83 # define TLS_DTV_AT_TP 1 84 85 /* Get the thread descriptor definition. */ 86 # include <descr.h> 87 88 /* Install the dtv pointer. The pointer passed is to the element with 89 index -1 which contain the length. */ 90 # define INSTALL_DTV(tcbp, dtvp) \ 91 ((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1 92 93 /* Install new dtv for current thread. */ 94 # define INSTALL_NEW_DTV(dtv) \ 95 ({ tcbhead_t *__tcbp; \ 96 __asm__ __volatile__ ("stc gbr,%0" : "=r" (__tcbp)); \ 97 __tcbp->dtv = (dtv);}) 98 99 /* Return dtv of given thread descriptor. */ 100 # define GET_DTV(tcbp) \ 101 (((tcbhead_t *) (tcbp))->dtv) 102 103 /* Code to initially initialize the thread pointer. This might need 104 special attention since 'errno' is not yet available and if the 105 operation can cause a failure 'errno' must not be touched. */ 106 # define TLS_INIT_TP(tcbp, secondcall) \ 107 ({ __asm__ __volatile__ ("ldc %0,gbr" : : "r" (tcbp)); 0; }) 108 109 /* Return the address of the dtv for the current thread. */ 110 # define THREAD_DTV() \ 111 ({ tcbhead_t *__tcbp; \ 112 __asm__ __volatile__ ("stc gbr,%0" : "=r" (__tcbp)); \ 113 __tcbp->dtv;}) 114 115 /* Return the thread descriptor for the current thread. 116 The contained asm must *not* be marked volatile since otherwise 117 assignments like 118 struct pthread *self = thread_self(); 119 do not get optimized away. */ 120 # define THREAD_SELF \ 121 ({ struct pthread *__self; \ 122 __asm__ ("stc gbr,%0" : "=r" (__self)); \ 123 __self - 1;}) 124 125 /* Magic for libthread_db to know how to do THREAD_SELF. */ 126 # define DB_THREAD_SELF \ 127 REGISTER (32, 32, REG_GBR * 4, -sizeof (struct pthread)) 128 129 /* Read member of the thread descriptor directly. */ 130 # define THREAD_GETMEM(descr, member) (descr->member) 131 132 /* Same as THREAD_GETMEM, but the member offset can be non-constant. */ 133 # define THREAD_GETMEM_NC(descr, member, idx) (descr->member[idx]) 134 135 /* Set member of the thread descriptor directly. */ 136 # define THREAD_SETMEM(descr, member, value) \ 137 descr->member = (value) 138 139 /* Same as THREAD_SETMEM, but the member offset can be non-constant. */ 140 # define THREAD_SETMEM_NC(descr, member, idx, value) \ 141 descr->member[idx] = (value) 142 143 #define THREAD_GET_POINTER_GUARD() \ 144 ({ tcbhead_t *__tcbp; \ 145 __asm__ __volatile__ ("stc gbr,%0" : "=r" (__tcbp)); \ 146 __tcbp->pointer_guard;}) 147 #define THREAD_SET_POINTER_GUARD(value) \ 148 ({ tcbhead_t *__tcbp; \ 149 __asm__ __volatile__ ("stc gbr,%0" : "=r" (__tcbp)); \ 150 __tcbp->pointer_guard = (value);}) 151 #define THREAD_COPY_POINTER_GUARD(descr) \ 152 ({ tcbhead_t *__tcbp; \ 153 __asm__ __volatile__ ("stc gbr,%0" : "=r" (__tcbp)); \ 154 ((tcbhead_t *) (descr + 1))->pointer_guard = __tcbp->pointer_guard;}) 155 156 /* Get and set the global scope generation counter in struct pthread. */ 157 #define THREAD_GSCOPE_FLAG_UNUSED 0 158 #define THREAD_GSCOPE_FLAG_USED 1 159 #define THREAD_GSCOPE_FLAG_WAIT 2 160 #define THREAD_GSCOPE_RESET_FLAG() \ 161 do \ 162 { int __res \ 163 = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \ 164 THREAD_GSCOPE_FLAG_UNUSED); \ 165 if (__res == THREAD_GSCOPE_FLAG_WAIT) \ 166 lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \ 167 } \ 168 while (0) 169 #define THREAD_GSCOPE_SET_FLAG() \ 170 do \ 171 { \ 172 THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \ 173 atomic_write_barrier (); \ 174 } \ 175 while (0) 176 #define THREAD_GSCOPE_WAIT() \ 177 GL(dl_wait_lookup_done) () 178 179 #endif /* __ASSEMBLER__ */ 180 181 #endif /* tls.h */ 182