1 /* Definitions for thread-local data handling. NPTL/sparc 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 <bits/kernel-features.h> 29 30 /* Type for the dtv. */ 31 typedef union dtv 32 { 33 size_t counter; 34 struct 35 { 36 void *val; 37 bool is_static; 38 } pointer; 39 } dtv_t; 40 41 typedef struct 42 { 43 void *tcb; /* Pointer to the TCB. Not necessary the 44 thread descriptor used by libpthread. */ 45 dtv_t *dtv; 46 void *self; 47 int multiple_threads; 48 #if __WORDSIZE == 64 49 int gscope_flag; 50 #endif 51 uintptr_t sysinfo; 52 uintptr_t stack_guard; 53 uintptr_t pointer_guard; 54 #if __WORDSIZE != 64 55 int gscope_flag; 56 #endif 57 #ifndef __ASSUME_PRIVATE_FUTEX 58 int private_futex; 59 #endif 60 } tcbhead_t; 61 62 #else /* __ASSEMBLER__ */ 63 # include <tcb-offsets.h> 64 #endif /* __ASSEMBLER__ */ 65 66 /* We require TLS support in the tools. */ 67 #define HAVE_TLS_SUPPORT 68 #define HAVE___THREAD 1 69 #define HAVE_TLS_MODEL_ATTRIBUTE 1 70 71 /* Signal that TLS support is available. */ 72 #define USE_TLS 1 73 74 #ifndef __ASSEMBLER__ 75 /* Get system call information. */ 76 # include <sysdep.h> 77 78 /* Get the thread descriptor definition. */ 79 # include <descr.h> 80 81 register struct pthread *__thread_self __asm__("%g7"); 82 83 /* This is the size of the initial TCB. Can't be just sizeof (tcbhead_t), 84 because NPTL getpid, __libc_alloca_cutoff etc. need (almost) the whole 85 struct pthread even when not linked with -lpthread. */ 86 # define TLS_INIT_TCB_SIZE sizeof (struct pthread) 87 88 /* Alignment requirements for the initial TCB. */ 89 # define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread) 90 91 /* This is the size of the TCB. */ 92 # define TLS_TCB_SIZE sizeof (struct pthread) 93 94 /* Alignment requirements for the TCB. */ 95 # define TLS_TCB_ALIGN __alignof__ (struct pthread) 96 97 /* The TCB can have any size and the memory following the address the 98 thread pointer points to is unspecified. Allocate the TCB there. */ 99 # define TLS_TCB_AT_TP 1 100 101 /* Install the dtv pointer. The pointer passed is to the element with 102 index -1 which contain the length. */ 103 # define INSTALL_DTV(descr, dtvp) \ 104 ((tcbhead_t *) (descr))->dtv = (dtvp) + 1 105 106 /* Install new dtv for current thread. */ 107 # define INSTALL_NEW_DTV(DTV) \ 108 (((tcbhead_t *) __thread_self)->dtv = (DTV)) 109 110 /* Return dtv of given thread descriptor. */ 111 # define GET_DTV(descr) \ 112 (((tcbhead_t *) (descr))->dtv) 113 114 /* Code to initially initialize the thread pointer. */ 115 # define TLS_INIT_TP(descr, secondcall) \ 116 (__thread_self = (__typeof (__thread_self)) (descr), NULL) 117 118 /* Return the address of the dtv for the current thread. */ 119 # define THREAD_DTV() \ 120 (((tcbhead_t *) __thread_self)->dtv) 121 122 /* Return the thread descriptor for the current thread. */ 123 #define THREAD_SELF __thread_self 124 125 /* Magic for libthread_db to know how to do THREAD_SELF. */ 126 # define DB_THREAD_SELF_INCLUDE <sys/ucontext.h> 127 # define DB_THREAD_SELF \ 128 REGISTER (32, 32, REG_G7 * 4, 0) REGISTER (64, 64, REG_G7 * 8, 0) 129 130 /* Access to data in the thread descriptor is easy. */ 131 #define THREAD_GETMEM(descr, member) \ 132 descr->member 133 #define THREAD_GETMEM_NC(descr, member, idx) \ 134 descr->member[idx] 135 #define THREAD_SETMEM(descr, member, value) \ 136 descr->member = (value) 137 #define THREAD_SETMEM_NC(descr, member, idx, value) \ 138 descr->member[idx] = (value) 139 140 /* Set the stack guard field in TCB head. */ 141 #define THREAD_SET_STACK_GUARD(value) \ 142 THREAD_SETMEM (THREAD_SELF, header.stack_guard, value) 143 # define THREAD_COPY_STACK_GUARD(descr) \ 144 ((descr)->header.stack_guard \ 145 = THREAD_GETMEM (THREAD_SELF, header.stack_guard)) 146 147 /* Get/set the stack guard field in TCB head. */ 148 #define THREAD_GET_POINTER_GUARD() \ 149 THREAD_GETMEM (THREAD_SELF, header.pointer_guard) 150 #define THREAD_SET_POINTER_GUARD(value) \ 151 THREAD_SETMEM (THREAD_SELF, header.pointer_guard, value) 152 # define THREAD_COPY_POINTER_GUARD(descr) \ 153 ((descr)->header.pointer_guard = THREAD_GET_POINTER_GUARD ()) 154 155 /* Get and set the global scope generation counter in struct pthread. */ 156 #define THREAD_GSCOPE_FLAG_UNUSED 0 157 #define THREAD_GSCOPE_FLAG_USED 1 158 #define THREAD_GSCOPE_FLAG_WAIT 2 159 #define THREAD_GSCOPE_RESET_FLAG() \ 160 do \ 161 { int __res \ 162 = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \ 163 THREAD_GSCOPE_FLAG_UNUSED); \ 164 if (__res == THREAD_GSCOPE_FLAG_WAIT) \ 165 lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \ 166 } \ 167 while (0) 168 #define THREAD_GSCOPE_SET_FLAG() \ 169 do \ 170 { \ 171 THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \ 172 atomic_write_barrier (); \ 173 } \ 174 while (0) 175 #define THREAD_GSCOPE_WAIT() \ 176 GL(dl_wait_lookup_done) () 177 178 #endif /* !ASSEMBLER */ 179 180 #endif /* tls.h */ 181