1 /* Definition for thread-local data handling. NPTL/ARM version. 2 Copyright (C) 2005-2022 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 _ARM_NPTL_TLS_H 20 #define _ARM_NPTL_TLS_H 1 21 22 #include <dl-sysdep.h> 23 24 #ifndef __ASSEMBLER__ 25 # include <stdbool.h> 26 # include <stddef.h> 27 # include <stdint.h> 28 # include <dl-dtv.h> 29 #endif /* __ASSEMBLER__ */ 30 31 32 #ifndef __ASSEMBLER__ 33 34 /* The TP points to the start of the thread blocks. */ 35 # define TLS_DTV_AT_TP 1 36 # define TLS_TCB_AT_TP 0 37 38 /* Get the thread descriptor definition. */ 39 # include <nptl/descr.h> 40 41 typedef struct 42 { 43 dtv_t *dtv; 44 void *private; 45 } tcbhead_t; 46 47 /* This is the size of the initial TCB. */ 48 # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t) 49 50 /* This is the size of the TCB. */ 51 # define TLS_TCB_SIZE sizeof (tcbhead_t) 52 53 /* This is the size we need before TCB. */ 54 # define TLS_PRE_TCB_SIZE sizeof (struct pthread) 55 56 /* Install the dtv pointer. The pointer passed is to the element with 57 index -1 which contain the length. */ 58 # define INSTALL_DTV(tcbp, dtvp) \ 59 (((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1) 60 61 /* Install new dtv for current thread. */ 62 # define INSTALL_NEW_DTV(dtv) \ 63 (THREAD_DTV() = (dtv)) 64 65 /* Return dtv of given thread descriptor. */ 66 # define GET_DTV(tcbp) \ 67 (((tcbhead_t *) (tcbp))->dtv) 68 69 # define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) + 1 70 71 /* Return the address of the dtv for the current thread. */ 72 # define THREAD_DTV() \ 73 (((tcbhead_t *) __builtin_thread_pointer ())->dtv) 74 75 /* Return the thread descriptor for the current thread. */ 76 # define THREAD_SELF \ 77 ((struct pthread *)__builtin_thread_pointer () - 1) 78 79 /* Magic for libthread_db to know how to do THREAD_SELF. */ 80 # define DB_THREAD_SELF \ 81 CONST_THREAD_AREA (32, sizeof (struct pthread)) 82 83 # include <tcb-access.h> 84 85 /* Get and set the global scope generation counter in struct pthread. */ 86 #define THREAD_GSCOPE_FLAG_UNUSED 0 87 #define THREAD_GSCOPE_FLAG_USED 1 88 #define THREAD_GSCOPE_FLAG_WAIT 2 89 #define THREAD_GSCOPE_RESET_FLAG() \ 90 do \ 91 { int __res \ 92 = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \ 93 THREAD_GSCOPE_FLAG_UNUSED); \ 94 if (__res == THREAD_GSCOPE_FLAG_WAIT) \ 95 lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \ 96 } \ 97 while (0) 98 #define THREAD_GSCOPE_SET_FLAG() \ 99 do \ 100 { \ 101 THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \ 102 atomic_write_barrier (); \ 103 } \ 104 while (0) 105 106 #endif /* __ASSEMBLER__ */ 107 108 #endif /* tls.h */ 109