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| 1 | /* Definition for thread-local data handling. NPTL/RISC-V version. |
|---|---|
| 2 | Copyright (C) 2011-2024 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 _RISCV_TLS_H |
| 20 | #define _RISCV_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 | |
| 30 | register void *__thread_self asm ("tp"); |
| 31 | # define READ_THREAD_POINTER() ({ __thread_self; }) |
| 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 | /* This is the size of the initial TCB. Because our TCB is before the thread |
| 50 | pointer, we don't need this. */ |
| 51 | # define TLS_INIT_TCB_SIZE 0 |
| 52 | |
| 53 | /* This is the size of the TCB. Because our TCB is before the thread |
| 54 | pointer, we don't need this. */ |
| 55 | # define TLS_TCB_SIZE 0 |
| 56 | |
| 57 | /* This is the size we need before TCB - actually, it includes the TCB. */ |
| 58 | # define TLS_PRE_TCB_SIZE \ |
| 59 | (sizeof (struct pthread) \ |
| 60 | + ((sizeof (tcbhead_t) + __alignof (struct pthread) - 1) \ |
| 61 | & ~(__alignof (struct pthread) - 1))) |
| 62 | |
| 63 | /* The thread pointer tp points to the end of the TCB. |
| 64 | The pthread_descr structure is immediately in front of the TCB. */ |
| 65 | # define TLS_TCB_OFFSET 0 |
| 66 | |
| 67 | /* Install the dtv pointer. The pointer passed is to the element with |
| 68 | index -1 which contain the length. */ |
| 69 | # define INSTALL_DTV(tcbp, dtvp) \ |
| 70 | (((tcbhead_t *) (tcbp))[-1].dtv = (dtvp) + 1) |
| 71 | |
| 72 | /* Install new dtv for current thread. */ |
| 73 | # define INSTALL_NEW_DTV(dtv) \ |
| 74 | (THREAD_DTV() = (dtv)) |
| 75 | |
| 76 | /* Return dtv of given thread descriptor. */ |
| 77 | # define GET_DTV(tcbp) \ |
| 78 | (((tcbhead_t *) (tcbp))[-1].dtv) |
| 79 | |
| 80 | /* Code to initially initialize the thread pointer. */ |
| 81 | # define TLS_INIT_TP(tcbp) \ |
| 82 | ({ __thread_self = (char*)tcbp + TLS_TCB_OFFSET; true; }) |
| 83 | |
| 84 | /* Return the address of the dtv for the current thread. */ |
| 85 | # define THREAD_DTV() \ |
| 86 | (((tcbhead_t *) (READ_THREAD_POINTER () - TLS_TCB_OFFSET))[-1].dtv) |
| 87 | |
| 88 | /* Return the thread descriptor for the current thread. */ |
| 89 | # define THREAD_SELF \ |
| 90 | ((struct pthread *) (READ_THREAD_POINTER () \ |
| 91 | - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE)) |
| 92 | |
| 93 | /* Value passed to 'clone' for initialization of the thread register. */ |
| 94 | # define TLS_DEFINE_INIT_TP(tp, pd) \ |
| 95 | void *tp = (void *) (pd) + TLS_TCB_OFFSET + TLS_PRE_TCB_SIZE |
| 96 | |
| 97 | /* Informs libthread_db that the thread pointer is register 4, which is used |
| 98 | * to know how to do THREAD_SELF. */ |
| 99 | # define DB_THREAD_SELF \ |
| 100 | REGISTER (64, 64, 4 * 8, - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE) |
| 101 | |
| 102 | /* Access to data in the thread descriptor is easy. */ |
| 103 | # include <tcb-access.h> |
| 104 | |
| 105 | /* l_tls_offset == 0 is perfectly valid, so we have to use some different |
| 106 | value to mean unset l_tls_offset. */ |
| 107 | # define NO_TLS_OFFSET -1 |
| 108 | |
| 109 | /* Get and set the global scope generation counter in struct pthread. */ |
| 110 | # define THREAD_GSCOPE_FLAG_UNUSED 0 |
| 111 | # define THREAD_GSCOPE_FLAG_USED 1 |
| 112 | # define THREAD_GSCOPE_FLAG_WAIT 2 |
| 113 | # define THREAD_GSCOPE_RESET_FLAG() \ |
| 114 | do \ |
| 115 | { int __res \ |
| 116 | = atomic_exchange_release (&THREAD_SELF->header.gscope_flag, \ |
| 117 | THREAD_GSCOPE_FLAG_UNUSED); \ |
| 118 | if (__res == THREAD_GSCOPE_FLAG_WAIT) \ |
| 119 | lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \ |
| 120 | } \ |
| 121 | while (0) |
| 122 | # define THREAD_GSCOPE_SET_FLAG() \ |
| 123 | do \ |
| 124 | { \ |
| 125 | THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \ |
| 126 | atomic_write_barrier (); \ |
| 127 | } \ |
| 128 | while (0) |
| 129 | |
| 130 | #endif /* __ASSEMBLER__ */ |
| 131 | |
| 132 | #endif /* tls.h */ |
| 133 |
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