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| 1 | /* Definition for thread-local data handling. NPTL/s390 version. |
|---|---|
| 2 | Copyright (C) 2003-2022 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 _TLS_H |
| 20 | #define _TLS_H 1 |
| 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; /* Pointer to the thread descriptor. */ |
| 38 | int multiple_threads; |
| 39 | uintptr_t sysinfo; |
| 40 | uintptr_t stack_guard; |
| 41 | int gscope_flag; |
| 42 | int __glibc_reserved1; |
| 43 | /* GCC split stack support. */ |
| 44 | void *__private_ss; |
| 45 | } tcbhead_t; |
| 46 | |
| 47 | # ifndef __s390x__ |
| 48 | # define TLS_MULTIPLE_THREADS_IN_TCB 1 |
| 49 | # endif |
| 50 | |
| 51 | #else /* __ASSEMBLER__ */ |
| 52 | # include <tcb-offsets.h> |
| 53 | #endif |
| 54 | |
| 55 | |
| 56 | /* Alignment requirement for the stack. For IA-32 this is governed by |
| 57 | the SSE memory functions. */ |
| 58 | #define STACK_ALIGN 16 |
| 59 | |
| 60 | #ifndef __ASSEMBLER__ |
| 61 | /* Get system call information. */ |
| 62 | # include <sysdep.h> |
| 63 | |
| 64 | /* This is the size of the initial TCB. Can't be just sizeof (tcbhead_t), |
| 65 | because NPTL getpid, __libc_alloca_cutoff etc. need (almost) the whole |
| 66 | struct pthread even when not linked with -lpthread. */ |
| 67 | # define TLS_INIT_TCB_SIZE sizeof (struct pthread) |
| 68 | |
| 69 | /* This is the size of the TCB. */ |
| 70 | # define TLS_TCB_SIZE sizeof (struct pthread) |
| 71 | |
| 72 | /* The TCB can have any size and the memory following the address the |
| 73 | thread pointer points to is unspecified. Allocate the TCB there. */ |
| 74 | # define TLS_TCB_AT_TP 1 |
| 75 | # define TLS_DTV_AT_TP 0 |
| 76 | |
| 77 | /* Get the thread descriptor definition. */ |
| 78 | # include <nptl/descr.h> |
| 79 | |
| 80 | |
| 81 | /* Install the dtv pointer. The pointer passed is to the element with |
| 82 | index -1 which contain the length. */ |
| 83 | # define INSTALL_DTV(descr, dtvp) \ |
| 84 | ((tcbhead_t *) (descr))->dtv = (dtvp) + 1 |
| 85 | |
| 86 | /* Install new dtv for current thread. */ |
| 87 | # define INSTALL_NEW_DTV(dtv) \ |
| 88 | (((tcbhead_t *) __builtin_thread_pointer ())->dtv = (dtv)) |
| 89 | |
| 90 | /* Return dtv of given thread descriptor. */ |
| 91 | # define GET_DTV(descr) \ |
| 92 | (((tcbhead_t *) (descr))->dtv) |
| 93 | |
| 94 | #if defined NEED_DL_SYSINFO && defined SHARED |
| 95 | # define INIT_SYSINFO \ |
| 96 | _head->sysinfo = GLRO(dl_sysinfo) |
| 97 | #else |
| 98 | # define INIT_SYSINFO |
| 99 | #endif |
| 100 | |
| 101 | /* Code to initially initialize the thread pointer. This might need |
| 102 | special attention since 'errno' is not yet available and if the |
| 103 | operation can cause a failure 'errno' must not be touched. */ |
| 104 | # define TLS_INIT_TP(thrdescr) \ |
| 105 | ({ void *_thrdescr = (thrdescr); \ |
| 106 | tcbhead_t *_head = _thrdescr; \ |
| 107 | \ |
| 108 | _head->tcb = _thrdescr; \ |
| 109 | /* For now the thread descriptor is at the same address. */ \ |
| 110 | _head->self = _thrdescr; \ |
| 111 | /* New syscall handling support. */ \ |
| 112 | INIT_SYSINFO; \ |
| 113 | \ |
| 114 | __builtin_set_thread_pointer (_thrdescr); \ |
| 115 | NULL; \ |
| 116 | }) |
| 117 | |
| 118 | /* Value passed to 'clone' for initialization of the thread register. */ |
| 119 | # define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) |
| 120 | |
| 121 | /* Return the address of the dtv for the current thread. */ |
| 122 | # define THREAD_DTV() \ |
| 123 | (((tcbhead_t *) __builtin_thread_pointer ())->dtv) |
| 124 | |
| 125 | /* Return the thread descriptor for the current thread. */ |
| 126 | # define THREAD_SELF ((struct pthread *) __builtin_thread_pointer ()) |
| 127 | |
| 128 | /* Magic for libthread_db to know how to do THREAD_SELF. */ |
| 129 | # define DB_THREAD_SELF REGISTER (32, 32, 18 * 4, 0) \ |
| 130 | REGISTER (64, __WORDSIZE, 18 * 8, 0) |
| 131 | |
| 132 | # include <tcb-access.h> |
| 133 | |
| 134 | /* Set the stack guard field in TCB head. */ |
| 135 | #define THREAD_SET_STACK_GUARD(value) \ |
| 136 | do \ |
| 137 | { \ |
| 138 | __asm__ __volatile__ ("" : : : "a0", "a1"); \ |
| 139 | THREAD_SETMEM (THREAD_SELF, header.stack_guard, value); \ |
| 140 | } \ |
| 141 | while (0) |
| 142 | #define THREAD_COPY_STACK_GUARD(descr) \ |
| 143 | ((descr)->header.stack_guard \ |
| 144 | = THREAD_GETMEM (THREAD_SELF, header.stack_guard)) |
| 145 | |
| 146 | /* s390 doesn't have HP_TIMING_*, so for the time being |
| 147 | use stack_guard as pointer_guard. */ |
| 148 | #define THREAD_GET_POINTER_GUARD() \ |
| 149 | THREAD_GETMEM (THREAD_SELF, header.stack_guard) |
| 150 | #define THREAD_SET_POINTER_GUARD(value) ((void) (value)) |
| 151 | #define THREAD_COPY_POINTER_GUARD(descr) |
| 152 | |
| 153 | /* Get and set the global scope generation counter in struct pthread. */ |
| 154 | #define THREAD_GSCOPE_FLAG_UNUSED 0 |
| 155 | #define THREAD_GSCOPE_FLAG_USED 1 |
| 156 | #define THREAD_GSCOPE_FLAG_WAIT 2 |
| 157 | #define THREAD_GSCOPE_RESET_FLAG() \ |
| 158 | do \ |
| 159 | { int __res \ |
| 160 | = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \ |
| 161 | THREAD_GSCOPE_FLAG_UNUSED); \ |
| 162 | if (__res == THREAD_GSCOPE_FLAG_WAIT) \ |
| 163 | lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \ |
| 164 | } \ |
| 165 | while (0) |
| 166 | #define THREAD_GSCOPE_SET_FLAG() \ |
| 167 | do \ |
| 168 | { \ |
| 169 | THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \ |
| 170 | atomic_write_barrier (); \ |
| 171 | } \ |
| 172 | while (0) |
| 173 | |
| 174 | #endif /* __ASSEMBLER__ */ |
| 175 | |
| 176 | #endif /* tls.h */ |
| 177 |
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