1 /* Definition for thread-local data handling. NPTL/Alpha version. 2 Copyright (C) 2003, 2005 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 <http://www.gnu.org/licenses/>. */ 18 19 #ifndef _TLS_H 20 #define _TLS_H 1 21 22 #ifndef __ASSEMBLER__ 23 # include <stdbool.h> 24 # include <stddef.h> 25 # include <stdint.h> 26 27 /* Type for the dtv. */ 28 typedef union dtv 29 { 30 size_t counter; 31 struct 32 { 33 void *val; 34 bool is_static; 35 } pointer; 36 } dtv_t; 37 38 #else /* __ASSEMBLER__ */ 39 # include <tcb-offsets.h> 40 #endif /* __ASSEMBLER__ */ 41 42 43 /* We require TLS support in the tools. */ 44 #ifndef HAVE_TLS_SUPPORT 45 # error "TLS support is required." 46 #endif 47 48 /* Signal that TLS support is available. */ 49 # define USE_TLS 1 50 51 #ifndef __ASSEMBLER__ 52 53 /* Get system call information. */ 54 # include <sysdep.h> 55 56 /* The TP points to the start of the thread blocks. */ 57 # define TLS_DTV_AT_TP 1 58 59 /* Get the thread descriptor definition. */ 60 # include <nptl/descr.h> 61 62 typedef struct 63 { 64 dtv_t *dtv; 65 void *private; 66 } tcbhead_t; 67 68 /* This is the size of the initial TCB. */ 69 # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t) 70 71 /* Alignment requirements for the initial TCB. */ 72 # define TLS_INIT_TCB_ALIGN 16 73 74 /* This is the size of the TCB. */ 75 # define TLS_TCB_SIZE sizeof (tcbhead_t) 76 77 /* This is the size we need before TCB. */ 78 # define TLS_PRE_TCB_SIZE sizeof (struct pthread) 79 80 /* Alignment requirements for the TCB. */ 81 # define TLS_TCB_ALIGN 16 82 83 /* Install the dtv pointer. The pointer passed is to the element with 84 index -1 which contain the length. */ 85 # define INSTALL_DTV(tcbp, dtvp) \ 86 (((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1) 87 88 /* Install new dtv for current thread. */ 89 # define INSTALL_NEW_DTV(dtv) \ 90 (THREAD_DTV() = (dtv)) 91 92 /* Return dtv of given thread descriptor. */ 93 # define GET_DTV(tcbp) \ 94 (((tcbhead_t *) (tcbp))->dtv) 95 96 /* Code to initially initialize the thread pointer. This might need 97 special attention since 'errno' is not yet available and if the 98 operation can cause a failure 'errno' must not be touched. */ 99 # define TLS_INIT_TP(tcbp, secondcall) \ 100 (__builtin_set_thread_pointer ((void *)(tcbp)), NULL) 101 102 /* Return the address of the dtv for the current thread. */ 103 # define THREAD_DTV() \ 104 (((tcbhead_t *) __builtin_thread_pointer ())->dtv) 105 106 /* Return the thread descriptor for the current thread. */ 107 # define THREAD_SELF \ 108 ((struct pthread *)__builtin_thread_pointer () - 1) 109 110 /* Magic for libthread_db to know how to do THREAD_SELF. */ 111 # define DB_THREAD_SELF \ 112 REGISTER (64, 64, 32 * 8, -sizeof (struct pthread)) 113 114 /* Access to data in the thread descriptor is easy. */ 115 #define THREAD_GETMEM(descr, member) \ 116 descr->member 117 #define THREAD_GETMEM_NC(descr, member, idx) \ 118 descr->member[idx] 119 #define THREAD_SETMEM(descr, member, value) \ 120 descr->member = (value) 121 #define THREAD_SETMEM_NC(descr, member, idx, value) \ 122 descr->member[idx] = (value) 123 124 #endif /* __ASSEMBLER__ */ 125 126 #endif /* tls.h */ 127