1 /* Definitions for thread-local data handling. NPTL/sparc version. 2 Copyright (C) 2003-2021 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 <https://www.gnu.org/licenses/>. */ 18 19 #ifndef _TLS_H 20 #define _TLS_H 21 22 #include <dl-sysdep.h> 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 <kernel-features.h> 30 # include <dl-dtv.h> 31 32 typedef struct 33 { 34 void *tcb; /* Pointer to the TCB. Not necessary the 35 thread descriptor used by libpthread. */ 36 dtv_t *dtv; 37 void *self; 38 int multiple_threads; 39 #if __WORDSIZE == 64 40 int gscope_flag; 41 #endif 42 uintptr_t sysinfo; 43 uintptr_t stack_guard; 44 uintptr_t pointer_guard; 45 #if __WORDSIZE != 64 46 int gscope_flag; 47 #endif 48 } tcbhead_t; 49 50 #else /* __ASSEMBLER__ */ 51 # include <tcb-offsets.h> 52 #endif /* __ASSEMBLER__ */ 53 54 55 #ifndef __ASSEMBLER__ 56 /* Get system call information. */ 57 # include <sysdep.h> 58 59 register struct pthread *__thread_self __asm__("%g7"); 60 61 /* This is the size of the initial TCB. Can't be just sizeof (tcbhead_t), 62 because NPTL getpid, __libc_alloca_cutoff etc. need (almost) the whole 63 struct pthread even when not linked with -lpthread. */ 64 # define TLS_INIT_TCB_SIZE sizeof (struct pthread) 65 66 /* This is the size of the TCB. */ 67 # define TLS_TCB_SIZE sizeof (struct pthread) 68 69 /* The TCB can have any size and the memory following the address the 70 thread pointer points to is unspecified. Allocate the TCB there. */ 71 # define TLS_TCB_AT_TP 1 72 # define TLS_DTV_AT_TP 0 73 74 /* Get the thread descriptor definition. */ 75 # include <nptl/descr.h> 76 77 /* Install the dtv pointer. The pointer passed is to the element with 78 index -1 which contain the length. */ 79 # define INSTALL_DTV(descr, dtvp) \ 80 ((tcbhead_t *) (descr))->dtv = (dtvp) + 1 81 82 /* Install new dtv for current thread. */ 83 # define INSTALL_NEW_DTV(DTV) \ 84 (((tcbhead_t *) __thread_self)->dtv = (DTV)) 85 86 /* Return dtv of given thread descriptor. */ 87 # define GET_DTV(descr) \ 88 (((tcbhead_t *) (descr))->dtv) 89 90 /* Code to initially initialize the thread pointer. */ 91 # define TLS_INIT_TP(descr) \ 92 (__thread_self = (__typeof (__thread_self)) (descr), NULL) 93 94 /* Value passed to 'clone' for initialization of the thread register. */ 95 # define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) 96 97 /* Return the address of the dtv for the current thread. */ 98 # define THREAD_DTV() \ 99 (((tcbhead_t *) __thread_self)->dtv) 100 101 /* Return the thread descriptor for the current thread. */ 102 #define THREAD_SELF __thread_self 103 104 /* Magic for libthread_db to know how to do THREAD_SELF. */ 105 # define DB_THREAD_SELF \ 106 REGISTER (32, 32, 10 * 4, 0) \ 107 REGISTER (64, __WORDSIZE, (6 * 8) + (__WORDSIZE==64?0:4), 0) 108 109 # include <tcb-access.h> 110 111 /* Set the stack guard field in TCB head. */ 112 #define THREAD_SET_STACK_GUARD(value) \ 113 THREAD_SETMEM (THREAD_SELF, header.stack_guard, value) 114 # define THREAD_COPY_STACK_GUARD(descr) \ 115 ((descr)->header.stack_guard \ 116 = THREAD_GETMEM (THREAD_SELF, header.stack_guard)) 117 118 /* Get/set the stack guard field in TCB head. */ 119 #define THREAD_GET_POINTER_GUARD() \ 120 THREAD_GETMEM (THREAD_SELF, header.pointer_guard) 121 #define THREAD_SET_POINTER_GUARD(value) \ 122 THREAD_SETMEM (THREAD_SELF, header.pointer_guard, value) 123 # define THREAD_COPY_POINTER_GUARD(descr) \ 124 ((descr)->header.pointer_guard = THREAD_GET_POINTER_GUARD ()) 125 126 /* Get and set the global scope generation counter in struct pthread. */ 127 #define THREAD_GSCOPE_FLAG_UNUSED 0 128 #define THREAD_GSCOPE_FLAG_USED 1 129 #define THREAD_GSCOPE_FLAG_WAIT 2 130 #define THREAD_GSCOPE_RESET_FLAG() \ 131 do \ 132 { int __res \ 133 = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \ 134 THREAD_GSCOPE_FLAG_UNUSED); \ 135 if (__res == THREAD_GSCOPE_FLAG_WAIT) \ 136 lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \ 137 } \ 138 while (0) 139 #define THREAD_GSCOPE_SET_FLAG() \ 140 do \ 141 { \ 142 THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \ 143 atomic_write_barrier (); \ 144 } \ 145 while (0) 146 147 #endif /* !ASSEMBLER */ 148 149 #endif /* tls.h */ 150