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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 | /* Definitions for thread-local data handling. linuxthreads/x86-64 version. Copyright (C) 2002, 2005 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 #ifndef __ASSEMBLER__ # include <pt-machine.h> # include <stdbool.h> # include <stddef.h> /* Type for the dtv. */ typedef union dtv { size_t counter; struct { void *val; bool is_static; } pointer; } dtv_t; typedef struct { void *tcb; /* Pointer to the TCB. Not necessary the thread descriptor used by libpthread. */ dtv_t *dtv; void *self; /* Pointer to the thread descriptor. */ int multiple_threads; } tcbhead_t; #else /* __ASSEMBLER__ */ # include <tcb-offsets.h> #endif #ifdef HAVE_TLS_SUPPORT /* Signal that TLS support is available. */ # define USE_TLS 1 # ifndef __ASSEMBLER__ /* Get system call information. */ # include <sysdep.h> /* Get the thread descriptor definition. */ # include <linuxthreads/descr.h> /* This is the size of the initial TCB. */ # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t) /* Alignment requirements for the initial TCB. */ # define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t) /* This is the size of the TCB. */ # define TLS_TCB_SIZE sizeof (struct _pthread_descr_struct) /* Alignment requirements for the TCB. */ # define TLS_TCB_ALIGN __alignof__ (struct _pthread_descr_struct) /* The TCB can have any size and the memory following the address the thread pointer points to is unspecified. Allocate the TCB there. */ # define TLS_TCB_AT_TP 1 /* Install the dtv pointer. The pointer passed is to the element with index -1 which contain the length. */ # define INSTALL_DTV(descr, dtvp) \ ((tcbhead_t *) (descr))->dtv = (dtvp) + 1 /* Install new dtv for current thread. */ # define INSTALL_NEW_DTV(dtv) \ ({ struct _pthread_descr_struct *__descr; \ THREAD_SETMEM (__descr, p_header.data.dtvp, (dtv)); }) /* Return dtv of given thread descriptor. */ # define GET_DTV(descr) \ (((tcbhead_t *) (descr))->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(descr, secondcall) \ ({ \ void *_descr = (descr); \ tcbhead_t *head = _descr; \ long int _result; \ \ head->tcb = _descr; \ /* For now the thread descriptor is at the same address. */ \ head->self = _descr; \ \ __asm__ __volatile__ ("syscall" \ : "=a" (_result) \ : "0" ((unsigned long int) __NR_arch_prctl), \ "D" ((unsigned long int) ARCH_SET_FS), \ "S" (_descr) \ : "memory", "cc", "r11", "cx"); \ \ _result ? "cannot set %fs base address for thread-local storage" : 0; \ }) /* Indicate that dynamic linker shouldn't try to initialize TLS even when no PT_TLS segments are found in the program and libraries it is linked against. */ # define TLS_INIT_TP_EXPENSIVE 1 /* Return the address of the dtv for the current thread. */ # define THREAD_DTV() \ ({ struct _pthread_descr_struct *__descr; \ THREAD_GETMEM (__descr, p_header.data.dtvp); }) # endif /* HAVE_TLS_SUPPORT */ #endif /* __ASSEMBLER__ */ #endif /* tls.h */ |