Warning: This file is not a C or C++ file. It does not have highlighting.
| 1 | /* Definition for thread-local data handling. NPTL/MIPS version. |
|---|---|
| 2 | Copyright (C) 2005-2024 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 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 | /* Get system call information. */ |
| 31 | # include <sysdep.h> |
| 32 | |
| 33 | #ifdef __mips16 |
| 34 | /* MIPS16 uses GCC builtin to access the TP. */ |
| 35 | # define READ_THREAD_POINTER() (__builtin_thread_pointer ()) |
| 36 | #else |
| 37 | /* Note: rd must be $v1 to be ABI-conformant. */ |
| 38 | # if defined (__mips_isa_rev) && __mips_isa_rev >= 2 |
| 39 | # define READ_THREAD_POINTER() \ |
| 40 | ({ void *__result; \ |
| 41 | asm volatile ("rdhwr\t%0, $29" : "=v" (__result)); \ |
| 42 | __result; }) |
| 43 | # else |
| 44 | # define READ_THREAD_POINTER() \ |
| 45 | ({ void *__result; \ |
| 46 | asm volatile (".set\tpush\n\t.set\tmips32r2\n\t" \ |
| 47 | "rdhwr\t%0, $29\n\t.set\tpop" : "=v" (__result)); \ |
| 48 | __result; }) |
| 49 | # endif |
| 50 | #endif |
| 51 | |
| 52 | #else /* __ASSEMBLER__ */ |
| 53 | # if __mips_isa_rev >= 2 |
| 54 | # define READ_THREAD_POINTER(rd) rdhwr rd, $29 |
| 55 | # else |
| 56 | # define READ_THREAD_POINTER(rd) \ |
| 57 | .set push; \ |
| 58 | .set mips32r2; \ |
| 59 | rdhwr rd, $29; \ |
| 60 | .set pop |
| 61 | # endif |
| 62 | #endif /* __ASSEMBLER__ */ |
| 63 | |
| 64 | |
| 65 | #ifndef __ASSEMBLER__ |
| 66 | |
| 67 | /* The TP points to the start of the thread blocks. */ |
| 68 | # define TLS_DTV_AT_TP 1 |
| 69 | # define TLS_TCB_AT_TP 0 |
| 70 | |
| 71 | /* Get the thread descriptor definition. */ |
| 72 | # include <nptl/descr.h> |
| 73 | |
| 74 | typedef struct |
| 75 | { |
| 76 | dtv_t *dtv; |
| 77 | void *private; |
| 78 | } tcbhead_t; |
| 79 | |
| 80 | /* This is the size of the initial TCB. Because our TCB is before the thread |
| 81 | pointer, we don't need this. */ |
| 82 | # define TLS_INIT_TCB_SIZE 0 |
| 83 | |
| 84 | /* This is the size of the TCB. Because our TCB is before the thread |
| 85 | pointer, we don't need this. */ |
| 86 | # define TLS_TCB_SIZE 0 |
| 87 | |
| 88 | /* This is the size we need before TCB - actually, it includes the TCB. */ |
| 89 | # define TLS_PRE_TCB_SIZE \ |
| 90 | (sizeof (struct pthread) \ |
| 91 | + ((sizeof (tcbhead_t) + __alignof (struct pthread) - 1) \ |
| 92 | & ~(__alignof (struct pthread) - 1))) |
| 93 | |
| 94 | /* The thread pointer (in hardware register $29) points to the end of |
| 95 | the TCB + 0x7000, as for PowerPC. The pthread_descr structure is |
| 96 | immediately in front of the TCB. */ |
| 97 | # define TLS_TCB_OFFSET 0x7000 |
| 98 | |
| 99 | /* Install the dtv pointer. The pointer passed is to the element with |
| 100 | index -1 which contain the length. */ |
| 101 | # define INSTALL_DTV(tcbp, dtvp) \ |
| 102 | (((tcbhead_t *) (tcbp))[-1].dtv = (dtvp) + 1) |
| 103 | |
| 104 | /* Install new dtv for current thread. */ |
| 105 | # define INSTALL_NEW_DTV(dtv) \ |
| 106 | (THREAD_DTV() = (dtv)) |
| 107 | |
| 108 | /* Return dtv of given thread descriptor. */ |
| 109 | # define GET_DTV(tcbp) \ |
| 110 | (((tcbhead_t *) (tcbp))[-1].dtv) |
| 111 | |
| 112 | /* Code to initially initialize the thread pointer. This might need |
| 113 | special attention since 'errno' is not yet available and if the |
| 114 | operation can cause a failure 'errno' must not be touched. */ |
| 115 | # define TLS_INIT_TP(tcbp) \ |
| 116 | ({ long int result_var; \ |
| 117 | result_var = INTERNAL_SYSCALL_CALL (set_thread_area, \ |
| 118 | (char *) (tcbp) + TLS_TCB_OFFSET); \ |
| 119 | !INTERNAL_SYSCALL_ERROR_P (result_var); }) |
| 120 | |
| 121 | /* Value passed to 'clone' for initialization of the thread register. */ |
| 122 | # define TLS_DEFINE_INIT_TP(tp, pd) \ |
| 123 | void *tp = (void *) (pd) + TLS_TCB_OFFSET + TLS_PRE_TCB_SIZE |
| 124 | |
| 125 | /* Return the address of the dtv for the current thread. */ |
| 126 | # define THREAD_DTV() \ |
| 127 | (((tcbhead_t *) (READ_THREAD_POINTER () - TLS_TCB_OFFSET))[-1].dtv) |
| 128 | |
| 129 | /* Return the thread descriptor for the current thread. */ |
| 130 | # define THREAD_SELF \ |
| 131 | ((struct pthread *) (READ_THREAD_POINTER () \ |
| 132 | - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE)) |
| 133 | |
| 134 | /* Magic for libthread_db to know how to do THREAD_SELF. */ |
| 135 | # define DB_THREAD_SELF \ |
| 136 | CONST_THREAD_AREA (32, TLS_TCB_OFFSET + TLS_PRE_TCB_SIZE) |
| 137 | |
| 138 | /* Access to data in the thread descriptor is easy. */ |
| 139 | # include <tcb-access.h> |
| 140 | |
| 141 | /* l_tls_offset == 0 is perfectly valid on MIPS, so we have to use some |
| 142 | different value to mean unset l_tls_offset. */ |
| 143 | # define NO_TLS_OFFSET -1 |
| 144 | |
| 145 | /* Get and set the global scope generation counter in struct pthread. */ |
| 146 | #define THREAD_GSCOPE_FLAG_UNUSED 0 |
| 147 | #define THREAD_GSCOPE_FLAG_USED 1 |
| 148 | #define THREAD_GSCOPE_FLAG_WAIT 2 |
| 149 | #define THREAD_GSCOPE_RESET_FLAG() \ |
| 150 | do \ |
| 151 | { int __res \ |
| 152 | = atomic_exchange_release (&THREAD_SELF->header.gscope_flag, \ |
| 153 | THREAD_GSCOPE_FLAG_UNUSED); \ |
| 154 | if (__res == THREAD_GSCOPE_FLAG_WAIT) \ |
| 155 | lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \ |
| 156 | } \ |
| 157 | while (0) |
| 158 | #define THREAD_GSCOPE_SET_FLAG() \ |
| 159 | do \ |
| 160 | { \ |
| 161 | THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \ |
| 162 | atomic_write_barrier (); \ |
| 163 | } \ |
| 164 | while (0) |
| 165 | |
| 166 | #endif /* __ASSEMBLER__ */ |
| 167 | |
| 168 | #endif /* tls.h */ |
| 169 |
Warning: This file is not a C or C++ file. It does not have highlighting.