1 /* Definition for thread-local data handling. NPTL/ARM version. 2 Copyright (C) 2005,2007 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 25 # include <stdbool.h> 26 # include <stddef.h> 27 # include <stdint.h> 28 29 /* Type for the dtv. */ 30 typedef union dtv 31 { 32 size_t counter; 33 struct 34 { 35 void *val; 36 bool is_static; 37 } pointer; 38 } dtv_t; 39 40 #else /* __ASSEMBLER__ */ 41 # include <tcb-offsets.h> 42 #endif /* __ASSEMBLER__ */ 43 44 45 /* We require TLS support in the tools. */ 46 #define HAVE_TLS_SUPPORT 1 47 #define HAVE_TLS_MODEL_ATTRIBUTE 1 48 #define HAVE___THREAD 1 49 50 /* Signal that TLS support is available. */ 51 #define USE_TLS 1 52 53 #ifndef __ASSEMBLER__ 54 55 /* Get system call information. */ 56 //# include <sysdep.h> 57 58 /* The TP points to the start of the thread blocks. */ 59 # define TLS_DTV_AT_TP 1 60 61 /* Get the thread descriptor definition. */ 62 # include <../../descr.h> 63 64 typedef struct 65 { 66 dtv_t *dtv; 67 void *private_data; 68 } tcbhead_t; 69 70 /* This is the size of the initial TCB. */ 71 # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t) 72 73 /* Alignment requirements for the initial TCB. */ 74 # define TLS_INIT_TCB_ALIGN 16 75 76 /* This is the size of the TCB. */ 77 # define TLS_TCB_SIZE sizeof (tcbhead_t) 78 79 /* This is the size we need before TCB. */ 80 # define TLS_PRE_TCB_SIZE sizeof (struct pthread) 81 82 /* Alignment requirements for the TCB. */ 83 # define TLS_TCB_ALIGN 16 84 85 /* Install the dtv pointer. The pointer passed is to the element with 86 index -1 which contain the length. */ 87 # define INSTALL_DTV(tcbp, dtvp) \ 88 (((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1) 89 90 /* Install new dtv for current thread. */ 91 # define INSTALL_NEW_DTV(dtv) \ 92 (THREAD_DTV() = (dtv)) 93 94 /* Return dtv of given thread descriptor. */ 95 # define GET_DTV(tcbp) \ 96 (((tcbhead_t *) (tcbp))->dtv) 97 98 /* Code to initially initialize the thread pointer. This might need 99 special attention since 'errno' is not yet available and if the 100 operation can cause a failure 'errno' must not be touched. */ 101 # define TLS_INIT_TP(tcbp, secondcall) \ 102 ({ __asm __volatile ("msr tpidr_el0, %0" : : "r" (tcbp)); NULL; }) 103 104 /* Return the address of the dtv for the current thread. */ 105 # define THREAD_DTV() \ 106 (((tcbhead_t *) __builtin_thread_pointer ())->dtv) 107 108 /* Return the thread descriptor for the current thread. */ 109 # define THREAD_SELF \ 110 ((struct pthread *)__builtin_thread_pointer () - 1) 111 112 /* Magic for libthread_db to know how to do THREAD_SELF. */ 113 # define DB_THREAD_SELF \ 114 CONST_THREAD_AREA (32, sizeof (struct pthread)) 115 116 /* Access to data in the thread descriptor is easy. */ 117 #define THREAD_GETMEM(descr, member) \ 118 descr->member 119 #define THREAD_GETMEM_NC(descr, member, idx) \ 120 descr->member[idx] 121 #define THREAD_SETMEM(descr, member, value) \ 122 descr->member = (value) 123 #define THREAD_SETMEM_NC(descr, member, idx, value) \ 124 descr->member[idx] = (value) 125 126 /* Initializing the thread pointer will generate a SIGILL if the syscall 127 is not available. */ 128 #define TLS_INIT_TP_EXPENSIVE 1 129 130 /* Get and set the global scope generation counter in struct pthread. */ 131 #define THREAD_GSCOPE_FLAG_UNUSED 0 132 #define THREAD_GSCOPE_FLAG_USED 1 133 #define THREAD_GSCOPE_FLAG_WAIT 2 134 #define THREAD_GSCOPE_RESET_FLAG() \ 135 do \ 136 { int __res \ 137 = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \ 138 THREAD_GSCOPE_FLAG_UNUSED); \ 139 if (__res == THREAD_GSCOPE_FLAG_WAIT) \ 140 lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \ 141 } \ 142 while (0) 143 #define THREAD_GSCOPE_SET_FLAG() \ 144 do \ 145 { \ 146 THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \ 147 atomic_write_barrier (); \ 148 } \ 149 while (0) 150 #define THREAD_GSCOPE_WAIT() \ 151 GL(dl_wait_lookup_done) () 152 153 #endif /* __ASSEMBLER__ */ 154 155 #endif /* tls.h */ 156