1 /* Copyright (C) 2005-2022 Free Software Foundation, Inc. 2 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 License as 7 published by the Free Software Foundation; either version 2.1 of the 8 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 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 #ifndef __ASSEMBLER__ 32 33 /* Get system call information. */ 34 # include <sysdep.h> 35 36 /* The TP points to the start of the thread blocks. */ 37 # define TLS_DTV_AT_TP 1 38 # define TLS_TCB_AT_TP 0 39 40 /* Get the thread descriptor definition. */ 41 # include <nptl/descr.h> 42 43 typedef struct 44 { 45 dtv_t *dtv; 46 void *private; 47 } tcbhead_t; 48 49 #define READ_THREAD_POINTER() \ 50 ({ register void *__microblaze_thread_area asm ("r21"); \ 51 __microblaze_thread_area; }) 52 53 /* This is the size of the initial TCB. */ 54 # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t) 55 56 /* This is the size of the TCB. */ 57 # define TLS_TCB_SIZE sizeof (tcbhead_t) 58 59 /* This is the size we need before TCB. */ 60 # define TLS_PRE_TCB_SIZE sizeof (struct pthread) 61 62 /* Install the dtv pointer. The pointer passed is to the element with 63 index -1 which contain the length. */ 64 # define INSTALL_DTV(tcbp, dtvp) \ 65 (((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1) 66 67 /* Install new dtv for current thread. */ 68 # define INSTALL_NEW_DTV(dtv) \ 69 (THREAD_DTV() = (dtv)) 70 71 /* Return dtv of given thread descriptor. */ 72 # define GET_DTV(tcbp) \ 73 (((tcbhead_t *) (tcbp))->dtv) 74 75 /* Code to initially initialize the thread pointer. 76 r21 is reserved for thread pointer. */ 77 # define TLS_INIT_TP(tcbp) \ 78 ({ __asm __volatile ("or r21,r0,%0" : : "r" ((void *)tcbp)); NULL; }) 79 80 # define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) + 1 81 82 /* Return the address of the dtv for the current thread. */ 83 # define THREAD_DTV() \ 84 (((tcbhead_t *) READ_THREAD_POINTER())->dtv) 85 86 /* Return the thread descriptor for the current thread. */ 87 # define THREAD_SELF \ 88 (((struct pthread *) READ_THREAD_POINTER()) - 1) 89 90 /* Magic for libthread_db to know how to do THREAD_SELF. */ 91 # define DB_THREAD_SELF \ 92 CONST_THREAD_AREA (32, sizeof (struct pthread)) 93 94 # include <tcb-access.h> 95 96 /* Get and set the global scope generation counter in struct pthread. */ 97 # define THREAD_GSCOPE_FLAG_UNUSED 0 98 # define THREAD_GSCOPE_FLAG_USED 1 99 # define THREAD_GSCOPE_FLAG_WAIT 2 100 # define THREAD_GSCOPE_RESET_FLAG() \ 101 do \ 102 { int __res \ 103 = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \ 104 THREAD_GSCOPE_FLAG_UNUSED); \ 105 if (__res == THREAD_GSCOPE_FLAG_WAIT) \ 106 lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \ 107 } \ 108 while (0) 109 # define THREAD_GSCOPE_SET_FLAG() \ 110 do \ 111 { \ 112 THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \ 113 atomic_write_barrier (); \ 114 } \ 115 while (0) 116 117 #endif /* __ASSEMBLER__ */ 118 119 #endif /* tls.h. */ 120