1 /* Definition for thread-local data handling. NPTL/Nios II version. 2 Copyright (C) 2012-2016 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 #ifndef __ASSEMBLER__ 51 52 /* Get system call information. */ 53 # include <sysdep.h> 54 55 /* The TP points to the start of the thread blocks. */ 56 # define TLS_DTV_AT_TP 1 57 58 /* Get the thread descriptor definition. */ 59 # include <../../descr.h> 60 61 typedef struct 62 { 63 dtv_t *dtv; 64 uintptr_t pointer_guard; 65 unsigned spare[6]; 66 } tcbhead_t; 67 68 register struct pthread *__thread_self __asm__("r23"); 69 70 #define READ_THREAD_POINTER() ((void *) __thread_self) 71 72 /* This is the size of the initial TCB. Because our TCB is before the thread 73 pointer, we don't need this. */ 74 # define TLS_INIT_TCB_SIZE 0 75 76 /* Alignment requirements for the initial TCB. */ 77 # define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread) 78 79 /* This is the size of the TCB. Because our TCB is before the thread 80 pointer, we don't need this. */ 81 # define TLS_TCB_SIZE 0 82 83 /* Alignment requirements for the TCB. */ 84 # define TLS_TCB_ALIGN __alignof__ (struct pthread) 85 86 /* This is the size we need before TCB - actually, it includes the TCB. */ 87 # define TLS_PRE_TCB_SIZE \ 88 (sizeof (struct pthread) \ 89 + ((sizeof (tcbhead_t) + TLS_TCB_ALIGN - 1) & ~(TLS_TCB_ALIGN - 1))) 90 91 /* The thread pointer (in hardware register r23) points to the end of 92 the TCB + 0x7000, as for PowerPC and MIPS. */ 93 # define TLS_TCB_OFFSET 0x7000 94 95 /* Install the dtv pointer. The pointer passed is to the element with 96 index -1 which contain the length. */ 97 # define INSTALL_DTV(tcbp, dtvp) \ 98 (((tcbhead_t *) (tcbp))[-1].dtv = (dtvp) + 1) 99 100 /* Install new dtv for current thread. */ 101 # define INSTALL_NEW_DTV(dtv) \ 102 (THREAD_DTV() = (dtv)) 103 104 /* Return dtv of given thread descriptor. */ 105 # define GET_DTV(tcbp) \ 106 (((tcbhead_t *) (tcbp))[-1].dtv) 107 108 /* Code to initially initialize the thread pointer. */ 109 # define TLS_INIT_TP(tcbp, secondcall) \ 110 (__thread_self = (struct pthread *) ((char *) tcbp + TLS_TCB_OFFSET), NULL) 111 112 /* Value passed to 'clone' for initialization of the thread register. */ 113 # define TLS_DEFINE_INIT_TP(tp, pd) \ 114 void *tp = (void *) (pd) + TLS_TCB_OFFSET + TLS_PRE_TCB_SIZE 115 116 /* Return the address of the dtv for the current thread. */ 117 # define THREAD_DTV() \ 118 (((tcbhead_t *) (READ_THREAD_POINTER () - TLS_TCB_OFFSET))[-1].dtv) 119 120 /* Return the thread descriptor for the current thread. */ 121 # define THREAD_SELF \ 122 ((struct pthread *) (READ_THREAD_POINTER () \ 123 - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE)) 124 125 /* Magic for libthread_db to know how to do THREAD_SELF. */ 126 # define DB_THREAD_SELF \ 127 REGISTER (32, 32, 23 * 4, -TLS_PRE_TCB_SIZE - TLS_TCB_OFFSET) 128 129 /* Access to data in the thread descriptor is easy. */ 130 # define THREAD_GETMEM(descr, member) \ 131 descr->member 132 # define THREAD_GETMEM_NC(descr, member, idx) \ 133 descr->member[idx] 134 # define THREAD_SETMEM(descr, member, value) \ 135 descr->member = (value) 136 # define THREAD_SETMEM_NC(descr, member, idx, value) \ 137 descr->member[idx] = (value) 138 139 # define THREAD_GET_POINTER_GUARD() \ 140 (((tcbhead_t *) (READ_THREAD_POINTER () \ 141 - TLS_TCB_OFFSET))[-1].pointer_guard) 142 # define THREAD_SET_POINTER_GUARD(value) \ 143 (THREAD_GET_POINTER_GUARD () = (value)) 144 # define THREAD_COPY_POINTER_GUARD(descr) \ 145 (((tcbhead_t *) ((void *) (descr) \ 146 + TLS_PRE_TCB_SIZE))[-1].pointer_guard \ 147 = THREAD_GET_POINTER_GUARD()) 148 149 /* l_tls_offset == 0 is perfectly valid on Nios II, so we have to use some 150 different value to mean unset l_tls_offset. */ 151 # define NO_TLS_OFFSET -1 152 153 /* Get and set the global scope generation counter in struct pthread. */ 154 #define THREAD_GSCOPE_FLAG_UNUSED 0 155 #define THREAD_GSCOPE_FLAG_USED 1 156 #define THREAD_GSCOPE_FLAG_WAIT 2 157 #define THREAD_GSCOPE_RESET_FLAG() \ 158 do \ 159 { int __res \ 160 = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \ 161 THREAD_GSCOPE_FLAG_UNUSED); \ 162 if (__res == THREAD_GSCOPE_FLAG_WAIT) \ 163 lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \ 164 } \ 165 while (0) 166 #define THREAD_GSCOPE_SET_FLAG() \ 167 do \ 168 { \ 169 THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \ 170 atomic_write_barrier (); \ 171 } \ 172 while (0) 173 #define THREAD_GSCOPE_WAIT() \ 174 GL(dl_wait_lookup_done) () 175 176 #endif /* __ASSEMBLER__ */ 177 178 #endif /* tls.h */ 179