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, 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 22 23 #ifndef __ASSEMBLER__ 24 # include <stdbool.h> 25 # include <stddef.h> 26 # include <stdint.h> 27 # include <stdlib.h> 28 # include <list.h> 29 # include <sysdep.h> 30 # include <bits/kernel-features.h> 31 32 /* Type for the dtv. */ 33 typedef union dtv 34 { 35 size_t counter; 36 struct 37 { 38 void *val; 39 bool is_static; 40 } pointer; 41 } dtv_t; 42 43 typedef struct 44 { 45 dtv_t *dtv; 46 uintptr_t pointer_guard; 47 } tcbhead_t; 48 49 # define TLS_MULTIPLE_THREADS_IN_TCB 1 50 51 #else /* __ASSEMBLER__ */ 52 # include <tcb-offsets.h> 53 #endif /* __ASSEMBLER__ */ 54 55 56 /* We require TLS support in the tools. */ 57 #define HAVE_TLS_SUPPORT 58 #define HAVE___THREAD 1 59 #define HAVE_TLS_MODEL_ATTRIBUTE 1 60 /* Signal that TLS support is available. */ 61 # define USE_TLS 1 62 63 #ifndef __ASSEMBLER__ 64 65 /* Get system call information. */ 66 # include <sysdep.h> 67 68 /* This is the size of the initial TCB. */ 69 # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t) 70 71 /* Alignment requirements for the initial TCB. */ 72 # define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t) 73 74 /* This is the size of the TCB. */ 75 # define TLS_TCB_SIZE sizeof (tcbhead_t) 76 77 /* This is the size we need before TCB. */ 78 # define TLS_PRE_TCB_SIZE sizeof (struct pthread) 79 80 /* Alignment requirements for the TCB. */ 81 # define TLS_TCB_ALIGN __alignof__ (struct pthread) 82 83 /* The TLS blocks start right after the TCB. */ 84 # define TLS_DTV_AT_TP 1 85 86 /* Get the thread descriptor definition. */ 87 # include <descr.h> 88 89 /* Install the dtv pointer. The pointer passed is to the element with 90 index -1 which contain the length. */ 91 # define INSTALL_DTV(tcbp, dtvp) \ 92 ((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1 93 94 /* Install new dtv for current thread. */ 95 # define INSTALL_NEW_DTV(dtv) \ 96 ({ tcbhead_t *__tcbp; \ 97 __asm__ __volatile__ ("stc gbr,%0" : "=r" (__tcbp)); \ 98 __tcbp->dtv = (dtv);}) 99 100 /* Return dtv of given thread descriptor. */ 101 # define GET_DTV(tcbp) \ 102 (((tcbhead_t *) (tcbp))->dtv) 103 104 /* Code to initially initialize the thread pointer. This might need 105 special attention since 'errno' is not yet available and if the 106 operation can cause a failure 'errno' must not be touched. */ 107 # define TLS_INIT_TP(tcbp, secondcall) \ 108 ({ __asm__ __volatile__ ("ldc %0,gbr" : : "r" (tcbp)); 0; }) 109 110 /* Return the address of the dtv for the current thread. */ 111 # define THREAD_DTV() \ 112 ({ tcbhead_t *__tcbp; \ 113 __asm__ __volatile__ ("stc gbr,%0" : "=r" (__tcbp)); \ 114 __tcbp->dtv;}) 115 116 /* Return the thread descriptor for the current thread. 117 The contained asm must *not* be marked volatile since otherwise 118 assignments like 119 struct pthread *self = thread_self(); 120 do not get optimized away. */ 121 # define THREAD_SELF \ 122 ({ struct pthread *__self; \ 123 __asm__ ("stc gbr,%0" : "=r" (__self)); \ 124 __self - 1;}) 125 126 /* Magic for libthread_db to know how to do THREAD_SELF. */ 127 # define DB_THREAD_SELF \ 128 REGISTER (32, 32, REG_GBR * 4, -sizeof (struct pthread)) 129 130 /* Read member of the thread descriptor directly. */ 131 # define THREAD_GETMEM(descr, member) (descr->member) 132 133 /* Same as THREAD_GETMEM, but the member offset can be non-constant. */ 134 # define THREAD_GETMEM_NC(descr, member, idx) (descr->member[idx]) 135 136 /* Set member of the thread descriptor directly. */ 137 # define THREAD_SETMEM(descr, member, value) \ 138 descr->member = (value) 139 140 /* Same as THREAD_SETMEM, but the member offset can be non-constant. */ 141 # define THREAD_SETMEM_NC(descr, member, idx, value) \ 142 descr->member[idx] = (value) 143 144 #define THREAD_GET_POINTER_GUARD() \ 145 ({ tcbhead_t *__tcbp; \ 146 __asm__ __volatile__ ("stc gbr,%0" : "=r" (__tcbp)); \ 147 __tcbp->pointer_guard;}) 148 #define THREAD_SET_POINTER_GUARD(value) \ 149 ({ tcbhead_t *__tcbp; \ 150 __asm__ __volatile__ ("stc gbr,%0" : "=r" (__tcbp)); \ 151 __tcbp->pointer_guard = (value);}) 152 #define THREAD_COPY_POINTER_GUARD(descr) \ 153 ({ tcbhead_t *__tcbp; \ 154 __asm__ __volatile__ ("stc gbr,%0" : "=r" (__tcbp)); \ 155 ((tcbhead_t *) (descr + 1))->pointer_guard = __tcbp->pointer_guard;}) 156 157 /* Get and set the global scope generation counter in struct pthread. */ 158 #define THREAD_GSCOPE_FLAG_UNUSED 0 159 #define THREAD_GSCOPE_FLAG_USED 1 160 #define THREAD_GSCOPE_FLAG_WAIT 2 161 #define THREAD_GSCOPE_RESET_FLAG() \ 162 do \ 163 { int __res \ 164 = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \ 165 THREAD_GSCOPE_FLAG_UNUSED); \ 166 if (__res == THREAD_GSCOPE_FLAG_WAIT) \ 167 lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \ 168 } \ 169 while (0) 170 #define THREAD_GSCOPE_SET_FLAG() \ 171 do \ 172 { \ 173 THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \ 174 atomic_write_barrier (); \ 175 } \ 176 while (0) 177 #define THREAD_GSCOPE_WAIT() \ 178 GL(dl_wait_lookup_done) () 179 180 #endif /* __ASSEMBLER__ */ 181 182 #endif /* tls.h */ 183