1 /* Definition for thread-local data handling. NPTL/ARC version. 2 Copyright (C) 2020-2022 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 _ARC_NPTL_TLS_H 20 #define _ARC_NPTL_TLS_H 1 21 22 #include <dl-sysdep.h> 23 24 #ifndef __ASSEMBLER__ 25 26 # include <stdbool.h> 27 # include <stddef.h> 28 # include <stdint.h> 29 30 #include <dl-dtv.h> 31 32 /* Get system call information. */ 33 # include <sysdep.h> 34 35 /* The TLS blocks start right after the TCB. */ 36 # define TLS_DTV_AT_TP 1 37 # define TLS_TCB_AT_TP 0 38 39 /* Get the thread descriptor definition. */ 40 # include <nptl/descr.h> 41 42 typedef struct 43 { 44 dtv_t *dtv; 45 uintptr_t pointer_guard; 46 } tcbhead_t; 47 48 /* This is the size of the initial TCB. */ 49 # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t) 50 51 /* This is the size of the TCB. */ 52 #ifndef TLS_TCB_SIZE 53 # define TLS_TCB_SIZE sizeof (tcbhead_t) 54 #endif 55 56 /* This is the size we need before TCB. */ 57 # define TLS_PRE_TCB_SIZE sizeof (struct pthread) 58 59 /* Install the dtv pointer. The pointer passed is to the element with 60 index -1 which contain the length. */ 61 # define INSTALL_DTV(tcbp, dtvp) \ 62 (((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1) 63 64 /* Install new dtv for current thread. */ 65 # define INSTALL_NEW_DTV(dtv) \ 66 (THREAD_DTV() = (dtv)) 67 68 /* Return dtv of given thread descriptor. */ 69 # define GET_DTV(tcbp) \ 70 (((tcbhead_t *) (tcbp))->dtv) 71 72 /* Code to initially initialize the thread pointer. */ 73 # define TLS_INIT_TP(tcbp) \ 74 ({ \ 75 long result_var; \ 76 __builtin_set_thread_pointer (tcbp); \ 77 result_var = INTERNAL_SYSCALL_CALL (arc_settls, (tcbp));\ 78 INTERNAL_SYSCALL_ERROR_P (result_var) \ 79 ? "settls syscall error" : NULL; \ 80 }) 81 82 /* Value passed to 'clone' for initialization of the thread register. */ 83 # define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) + 1 84 85 /* Return the address of the dtv for the current thread. */ 86 # define THREAD_DTV() \ 87 (((tcbhead_t *) __builtin_thread_pointer ())->dtv) 88 89 /* Return the thread descriptor for the current thread. */ 90 # define THREAD_SELF \ 91 ((struct pthread *)__builtin_thread_pointer () - 1) 92 93 /* Magic for libthread_db to know how to do THREAD_SELF. */ 94 # define DB_THREAD_SELF \ 95 CONST_THREAD_AREA (32, sizeof (struct pthread)) 96 97 # include <tcb-access.h> 98 99 /* Get and set the global scope generation counter in struct pthread. */ 100 #define THREAD_GSCOPE_FLAG_UNUSED 0 101 #define THREAD_GSCOPE_FLAG_USED 1 102 #define THREAD_GSCOPE_FLAG_WAIT 2 103 #define THREAD_GSCOPE_RESET_FLAG() \ 104 do \ 105 { int __res \ 106 = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \ 107 THREAD_GSCOPE_FLAG_UNUSED); \ 108 if (__res == THREAD_GSCOPE_FLAG_WAIT) \ 109 lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \ 110 } \ 111 while (0) 112 #define THREAD_GSCOPE_SET_FLAG() \ 113 do \ 114 { \ 115 THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \ 116 atomic_write_barrier (); \ 117 } \ 118 while (0) 119 120 #endif /* !__ASSEMBLER__ */ 121 122 #endif /* tls.h */ 123