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| 1 | /* Definitions for thread-local data handling. NPTL/sparc version. |
|---|---|
| 2 | Copyright (C) 2003-2024 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 _TLS_H |
| 20 | #define _TLS_H |
| 21 | |
| 22 | #include <dl-sysdep.h> |
| 23 | #ifndef __ASSEMBLER__ |
| 24 | # include <stdbool.h> |
| 25 | # include <stddef.h> |
| 26 | # include <stdint.h> |
| 27 | # include <stdlib.h> |
| 28 | # include <list.h> |
| 29 | # include <kernel-features.h> |
| 30 | # include <dl-dtv.h> |
| 31 | |
| 32 | typedef struct |
| 33 | { |
| 34 | void *tcb; /* Pointer to the TCB. Not necessary the |
| 35 | thread descriptor used by libpthread. */ |
| 36 | dtv_t *dtv; |
| 37 | void *self; |
| 38 | int multiple_threads; |
| 39 | #if __WORDSIZE == 64 |
| 40 | int gscope_flag; |
| 41 | #endif |
| 42 | uintptr_t sysinfo; |
| 43 | uintptr_t stack_guard; |
| 44 | uintptr_t pointer_guard; |
| 45 | #if __WORDSIZE != 64 |
| 46 | int gscope_flag; |
| 47 | #endif |
| 48 | } tcbhead_t; |
| 49 | |
| 50 | #else /* __ASSEMBLER__ */ |
| 51 | # include <tcb-offsets.h> |
| 52 | #endif /* __ASSEMBLER__ */ |
| 53 | |
| 54 | |
| 55 | #ifndef __ASSEMBLER__ |
| 56 | /* Get system call information. */ |
| 57 | # include <sysdep.h> |
| 58 | |
| 59 | register struct pthread *__thread_self __asm__("%g7"); |
| 60 | |
| 61 | /* This is the size of the initial TCB. Can't be just sizeof (tcbhead_t), |
| 62 | because NPTL getpid, __libc_alloca_cutoff etc. need (almost) the whole |
| 63 | struct pthread even when not linked with -lpthread. */ |
| 64 | # define TLS_INIT_TCB_SIZE sizeof (struct pthread) |
| 65 | |
| 66 | /* This is the size of the TCB. */ |
| 67 | # define TLS_TCB_SIZE sizeof (struct pthread) |
| 68 | |
| 69 | /* The TCB can have any size and the memory following the address the |
| 70 | thread pointer points to is unspecified. Allocate the TCB there. */ |
| 71 | # define TLS_TCB_AT_TP 1 |
| 72 | # define TLS_DTV_AT_TP 0 |
| 73 | |
| 74 | /* Get the thread descriptor definition. */ |
| 75 | # include <nptl/descr.h> |
| 76 | |
| 77 | /* Install the dtv pointer. The pointer passed is to the element with |
| 78 | index -1 which contain the length. */ |
| 79 | # define INSTALL_DTV(descr, dtvp) \ |
| 80 | ((tcbhead_t *) (descr))->dtv = (dtvp) + 1 |
| 81 | |
| 82 | /* Install new dtv for current thread. */ |
| 83 | # define INSTALL_NEW_DTV(DTV) \ |
| 84 | (((tcbhead_t *) __thread_self)->dtv = (DTV)) |
| 85 | |
| 86 | /* Return dtv of given thread descriptor. */ |
| 87 | # define GET_DTV(descr) \ |
| 88 | (((tcbhead_t *) (descr))->dtv) |
| 89 | |
| 90 | /* Code to initially initialize the thread pointer. */ |
| 91 | # define TLS_INIT_TP(descr) \ |
| 92 | (__thread_self = (__typeof (__thread_self)) (descr), true) |
| 93 | |
| 94 | /* Value passed to 'clone' for initialization of the thread register. */ |
| 95 | # define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) |
| 96 | |
| 97 | /* Return the address of the dtv for the current thread. */ |
| 98 | # define THREAD_DTV() \ |
| 99 | (((tcbhead_t *) __thread_self)->dtv) |
| 100 | |
| 101 | /* Return the thread descriptor for the current thread. */ |
| 102 | #define THREAD_SELF __thread_self |
| 103 | |
| 104 | /* Magic for libthread_db to know how to do THREAD_SELF. */ |
| 105 | # define DB_THREAD_SELF \ |
| 106 | REGISTER (32, 32, 10 * 4, 0) \ |
| 107 | REGISTER (64, __WORDSIZE, (6 * 8) + (__WORDSIZE==64?0:4), 0) |
| 108 | |
| 109 | # include <tcb-access.h> |
| 110 | |
| 111 | /* Set the stack guard field in TCB head. */ |
| 112 | #define THREAD_SET_STACK_GUARD(value) \ |
| 113 | THREAD_SETMEM (THREAD_SELF, header.stack_guard, value) |
| 114 | # define THREAD_COPY_STACK_GUARD(descr) \ |
| 115 | ((descr)->header.stack_guard \ |
| 116 | = THREAD_GETMEM (THREAD_SELF, header.stack_guard)) |
| 117 | |
| 118 | /* Get/set the stack guard field in TCB head. */ |
| 119 | #define THREAD_GET_POINTER_GUARD() \ |
| 120 | THREAD_GETMEM (THREAD_SELF, header.pointer_guard) |
| 121 | #define THREAD_SET_POINTER_GUARD(value) \ |
| 122 | THREAD_SETMEM (THREAD_SELF, header.pointer_guard, value) |
| 123 | # define THREAD_COPY_POINTER_GUARD(descr) \ |
| 124 | ((descr)->header.pointer_guard = THREAD_GET_POINTER_GUARD ()) |
| 125 | |
| 126 | /* Get and set the global scope generation counter in struct pthread. */ |
| 127 | #define THREAD_GSCOPE_FLAG_UNUSED 0 |
| 128 | #define THREAD_GSCOPE_FLAG_USED 1 |
| 129 | #define THREAD_GSCOPE_FLAG_WAIT 2 |
| 130 | #define THREAD_GSCOPE_RESET_FLAG() \ |
| 131 | do \ |
| 132 | { int __res \ |
| 133 | = atomic_exchange_release (&THREAD_SELF->header.gscope_flag, \ |
| 134 | THREAD_GSCOPE_FLAG_UNUSED); \ |
| 135 | if (__res == THREAD_GSCOPE_FLAG_WAIT) \ |
| 136 | lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \ |
| 137 | } \ |
| 138 | while (0) |
| 139 | #define THREAD_GSCOPE_SET_FLAG() \ |
| 140 | do \ |
| 141 | { \ |
| 142 | THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \ |
| 143 | atomic_write_barrier (); \ |
| 144 | } \ |
| 145 | while (0) |
| 146 | |
| 147 | #endif /* !ASSEMBLER */ |
| 148 | |
| 149 | #endif /* tls.h */ |
| 150 |
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