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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 | /* Definition for thread-local data handling. NPTL/RISCV32 version. Copyright (C) 2005, 2007, 2011 Free Software Foundation, Inc. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library. If not, see <http://www.gnu.org/licenses/>. */ #ifndef _TLS_H #define _TLS_H 1 #ifndef __ASSEMBLER__ # include <stdbool.h> # include <stddef.h> # include <stdint.h> /* Type for the dtv. */ typedef union dtv { size_t counter; struct { void *val; bool is_static; } pointer; } dtv_t; #else /* __ASSEMBLER__ */ # include <tcb-offsets.h> #endif /* __ASSEMBLER__ */ /* We require TLS support in the tools. */ #define HAVE_TLS_SUPPORT 1 #define HAVE_TLS_MODEL_ATTRIBUTE 1 #define HAVE___THREAD 1 /* Signal that TLS support is available. */ #define USE_TLS 1 #ifndef __ASSEMBLER__ register void *__thread_self __asm__("tp"); # define READ_THREAD_POINTER() ({ __thread_self; }) /* Get system call information. */ # include <sysdep.h> /* The TP points to the start of the TLS block. */ # define TLS_DTV_AT_TP 1 /* Get the thread descriptor definition. */ # include <../../descr.h> typedef struct { dtv_t *dtv; void *private; } tcbhead_t; /* This is the size of the initial TCB. Because our TCB is before the thread pointer, we don't need this. */ # define TLS_INIT_TCB_SIZE 0 # define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread) /* This is the size of the TCB. Because our TCB is before the thread pointer, we don't need this. */ # define TLS_TCB_SIZE 0 # define TLS_TCB_ALIGN __alignof__ (struct pthread) /* This is the size we need before TCB - actually, it includes the TCB. */ # define TLS_PRE_TCB_SIZE \ (sizeof (struct pthread) \ + ((sizeof (tcbhead_t) + __alignof (struct pthread) - 1) \ & ~(__alignof (struct pthread) - 1))) /* The thread pointer tp points to the end of the TCB. The pthread_descr structure is immediately in front of the TCB. */ # define TLS_TCB_OFFSET 0 /* Install the dtv pointer. The pointer passed is to the element with index -1 which contain the length. */ # define INSTALL_DTV(tcbp, dtvp) \ (((tcbhead_t *) (tcbp))[-1].dtv = (dtvp) + 1) /* Install new dtv for current thread */ # define INSTALL_NEW_DTV(dtv) \ (THREAD_DTV() = (dtv)) /* Return dtv of given thread descriptor. */ # define GET_DTV(tcbp) \ (((tcbhead_t *) (tcbp))[-1].dtv) /* Code to initially initialize the thread pointer. * * Set TP to the address _after_ tcbhead_t. This will allow us * to change the size of tcbhead_t without having to re-link everything. * * secondcall has something to do with USE__THREAD, * seems to always be 0 so we don't care about it. * * This has to return NULL on success (or a string with the failure text). * It's hard to fail this, so return NULL always. */ # define TLS_INIT_TP(tcbp, secondcall) \ ({ __thread_self = (char*)tcbp + TLS_TCB_OFFSET; NULL; }) /* Return the address of the dtv for the current thread. */ # define THREAD_DTV() \ (((tcbhead_t *) (READ_THREAD_POINTER () - TLS_TCB_OFFSET))[-1].dtv) /* Return the thread descriptor for the current thread. */ # define THREAD_SELF \ ((struct pthread *) (READ_THREAD_POINTER () \ - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE)) /* Informs libthread_db that the thread pointer is register 4, which is used * to know how to do THREAD_SELF. */ # define DB_THREAD_SELF \ REGISTER (64, 64, 4 * 8, - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE) /* Access to data in the thread descriptor is easy. */ #define THREAD_GETMEM(descr, member) \ descr->member #define THREAD_GETMEM_NC(descr, member, idx) \ descr->member[idx] #define THREAD_SETMEM(descr, member, value) \ descr->member = (value) #define THREAD_SETMEM_NC(descr, member, idx, value) \ descr->member[idx] = (value) /* l_tls_offset == 0 is perfectly valid, so we have to use some different value to mean unset l_tls_offset. */ # define NO_TLS_OFFSET -1 /* Get and set the global scope generation counter in struct pthread. */ #define THREAD_GSCOPE_FLAG_UNUSED 0 #define THREAD_GSCOPE_FLAG_USED 1 #define THREAD_GSCOPE_FLAG_WAIT 2 #define THREAD_GSCOPE_RESET_FLAG() \ do \ { int __res \ = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \ THREAD_GSCOPE_FLAG_UNUSED); \ if (__res == THREAD_GSCOPE_FLAG_WAIT) \ lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \ } \ while (0) #define THREAD_GSCOPE_SET_FLAG() \ do \ { \ THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \ atomic_write_barrier (); \ } \ while (0) #define THREAD_GSCOPE_WAIT() \ GL(dl_wait_lookup_done) () #endif /* __ASSEMBLER__ */ #endif /* tls.h */ |