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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 | /* Definition for thread-local data handling. NPTL/PowerPC version. Copyright (C) 2003, 2005, 2006, 2007 Free Software Foundation, Inc. This file is part of the GNU C Library. 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 /* We require TLS support in the tools. */ #ifndef HAVE_TLS_SUPPORT # error "TLS support is required." #endif /* Signal that TLS support is available. */ # define USE_TLS 1 #ifndef __ASSEMBLER__ /* Get system call information. */ # include <sysdep.h> /* The TP points to the start of the thread blocks. */ # define TLS_DTV_AT_TP 1 /* We use the multiple_threads field in the pthread struct */ #define TLS_MULTIPLE_THREADS_IN_TCB 1 /* Get the thread descriptor definition. */ # include <../../descr.h> /* The stack_guard is accessed directly by GCC -fstack-protector code, so it is a part of public ABI. The dtv and pointer_guard fields are private. */ typedef struct { uintptr_t pointer_guard; uintptr_t stack_guard; dtv_t *dtv; } tcbhead_t; /* This is the size of the initial TCB. */ # define TLS_INIT_TCB_SIZE 0 /* Alignment requirements for the initial TCB. */ # define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread) /* This is the size of the TCB. */ # define TLS_TCB_SIZE 0 /* Alignment requirements for the TCB. */ # define TLS_TCB_ALIGN __alignof__ (struct pthread) /* This is the size we need before TCB. */ # define TLS_PRE_TCB_SIZE \ (sizeof (struct pthread) \ + ((sizeof (tcbhead_t) + TLS_TCB_ALIGN - 1) & ~(TLS_TCB_ALIGN - 1))) # ifndef __powerpc64__ /* Register r2 (tp) is reserved by the ABI as "thread pointer". */ register void *__thread_register __asm__ ("r2"); # define PT_THREAD_POINTER PT_R2 # else /* Register r13 (tp) is reserved by the ABI as "thread pointer". */ register void *__thread_register __asm__ ("r13"); # define PT_THREAD_POINTER PT_R13 # endif /* The following assumes that TP (R2 or R13) points to the end of the TCB + 0x7000 (per the ABI). This implies that TCB address is TP - 0x7000. As we define TLS_DTV_AT_TP we can assume that the pthread struct is allocated immediately ahead of the TCB. This implies that the pthread_descr address is TP - (TLS_PRE_TCB_SIZE + 0x7000). */ # define TLS_TCB_OFFSET 0x7000 /* 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. This might need special attention since 'errno' is not yet available and if the operation can cause a failure 'errno' must not be touched. */ # define TLS_INIT_TP(tcbp, secondcall) \ (__thread_register = (void *) (tcbp) + TLS_TCB_OFFSET, NULL) /* Return the address of the dtv for the current thread. */ # define THREAD_DTV() \ (((tcbhead_t *) (__thread_register - TLS_TCB_OFFSET))[-1].dtv) /* Return the thread descriptor for the current thread. */ # define THREAD_SELF \ ((struct pthread *) (__thread_register \ - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE)) /* Magic for libthread_db to know how to do THREAD_SELF. */ # define DB_THREAD_SELF \ REGISTER (32, 32, PT_THREAD_POINTER * 4, \ - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE) \ REGISTER (64, 64, PT_THREAD_POINTER * 8, \ - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE) /* Read member of the thread descriptor directly. */ # define THREAD_GETMEM(descr, member) ((void)(descr), (THREAD_SELF)->member) /* Same as THREAD_GETMEM, but the member offset can be non-constant. */ # define THREAD_GETMEM_NC(descr, member, idx) \ ((void)(descr), (THREAD_SELF)->member[idx]) /* Set member of the thread descriptor directly. */ # define THREAD_SETMEM(descr, member, value) \ ((void)(descr), (THREAD_SELF)->member = (value)) /* Same as THREAD_SETMEM, but the member offset can be non-constant. */ # define THREAD_SETMEM_NC(descr, member, idx, value) \ ((void)(descr), (THREAD_SELF)->member[idx] = (value)) /* Set the stack guard field in TCB head. */ # define THREAD_SET_STACK_GUARD(value) \ (((tcbhead_t *) ((char *) __thread_register \ - TLS_TCB_OFFSET))[-1].stack_guard = (value)) # define THREAD_COPY_STACK_GUARD(descr) \ (((tcbhead_t *) ((char *) (descr) \ + TLS_PRE_TCB_SIZE))[-1].stack_guard \ = ((tcbhead_t *) ((char *) __thread_register \ - TLS_TCB_OFFSET))[-1].stack_guard) /* Set the stack guard field in TCB head. */ # define THREAD_GET_POINTER_GUARD() \ (((tcbhead_t *) ((char *) __thread_register \ - TLS_TCB_OFFSET))[-1].pointer_guard) # define THREAD_SET_POINTER_GUARD(value) \ (THREAD_GET_POINTER_GUARD () = (value)) # define THREAD_COPY_POINTER_GUARD(descr) \ (((tcbhead_t *) ((char *) (descr) \ + TLS_PRE_TCB_SIZE))[-1].pointer_guard \ = THREAD_GET_POINTER_GUARD()) /* l_tls_offset == 0 is perfectly valid on PPC, 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 */ |