nptl/sysdeps/ia64/tls.h

   1 /* Definition for thread-local data handling.  nptl/IA-64 version.
   2    Copyright (C) 2003, 2004, 2005, 2006, 2007 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef _TLS_H
  21 #define _TLS_H  1
  22
  23 #include <dl-sysdep.h>
  24 #ifndef __ASSEMBLER__
  25 # include <stdbool.h>
  26 # include <stddef.h>
  27 # include <stdint.h>
  28 # include <stdlib.h>
  29 # include <list.h>
  30
  31
  32 /* Type for the dtv.  */
  33 typedef union dtv
  34 {
  35   size_t counter;
  36   struct
  37   {
  38     void *val;
  39     bool is_static;
  40   } pointer;
  41 } dtv_t;
  42
  43
  44 typedef struct
  45 {
  46   dtv_t *dtv;
  47   void *__private;
  48 } tcbhead_t;
  49
  50 register struct pthread *__thread_self __asm__("r13");
  51
  52 # define TLS_MULTIPLE_THREADS_IN_TCB 1
  53
  54 #else /* __ASSEMBLER__ */
  55 # include <tcb-offsets.h>
  56 #endif
  57
  58
  59 /* We require TLS support in the tools.  */
  60 #ifndef HAVE_TLS_SUPPORT
  61 # error "TLS support is required."
  62 #endif
  63
  64 /* Signal that TLS support is available.  */
  65 #define USE_TLS 1
  66
  67 /* Alignment requirement for the stack.  */
  68 #define STACK_ALIGN     16
  69
  70 #ifndef __ASSEMBLER__
  71 /* Get system call information.  */
  72 # include <sysdep.h>
  73
  74 /* This is the size of the initial TCB.  */
  75 # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
  76
  77 /* Alignment requirements for the initial TCB.  */
  78 # define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t)
  79
  80 /* This is the size of the TCB.  */
  81 # define TLS_TCB_SIZE sizeof (tcbhead_t)
  82
  83 /* This is the size we need before TCB.
  84    If there is not any room for uintptr_t stack_guard and
  85    uintptr_t pointer_guard in struct pthread's final padding,
  86    we need to put struct pthread 16 byte slower.  */
  87 # define TLS_PRE_TCB_SIZE \
  88   (sizeof (struct pthread)                                              \
  89    + (PTHREAD_STRUCT_END_PADDING < 2 * sizeof (uintptr_t)               \
  90       ? ((2 * sizeof (uintptr_t) + __alignof__ (struct pthread) - 1)    \
  91          & ~(__alignof__ (struct pthread) - 1))                         \
  92       : 0))
  93
  94 /* Alignment requirements for the TCB.  */
  95 # define TLS_TCB_ALIGN __alignof__ (struct pthread)
  96
  97 /* The DTV is allocated at the TP; the TCB is placed elsewhere.  */
  98 # define TLS_DTV_AT_TP  1
  99
 100 /* Get the thread descriptor definition.  */
 101 # include <nptl/descr.h>
 102
 103 /* Install the dtv pointer.  The pointer passed is to the element with
 104    index -1 which contain the length.  */
 105 #  define INSTALL_DTV(descr, dtvp) \
 106   ((tcbhead_t *) (descr))->dtv = (dtvp) + 1
 107
 108 /* Install new dtv for current thread.  */
 109 #  define INSTALL_NEW_DTV(DTV) \
 110   (((tcbhead_t *)__thread_self)->dtv = (DTV))
 111
 112 /* Return dtv of given thread descriptor.  */
 113 #  define GET_DTV(descr) \
 114   (((tcbhead_t *) (descr))->dtv)
 115
 116 #define THREAD_SELF_SYSINFO     (((tcbhead_t *) __thread_self)->__private)
 117 #define THREAD_SYSINFO(pd) \
 118   (((tcbhead_t *) ((char *) (pd) + TLS_PRE_TCB_SIZE))->__private)
 119
 120 #if defined NEED_DL_SYSINFO
 121 # define INIT_SYSINFO   THREAD_SELF_SYSINFO = (void *) GLRO(dl_sysinfo)
 122 #else
 123 # define INIT_SYSINFO   NULL
 124 #endif
 125
 126 /* Code to initially initialize the thread pointer.  This might need
 127    special attention since 'errno' is not yet available and if the
 128    operation can cause a failure 'errno' must not be touched.  */
 129 # define TLS_INIT_TP(thrdescr, secondcall) \
 130   (__thread_self = (thrdescr), INIT_SYSINFO, NULL)
 131
 132 /* Return the address of the dtv for the current thread.  */
 133 #  define THREAD_DTV() \
 134   (((tcbhead_t *)__thread_self)->dtv)
 135
 136 /* Return the thread descriptor for the current thread.  */
 137 # define THREAD_SELF \
 138   ((struct pthread *) ((char *) __thread_self - TLS_PRE_TCB_SIZE))
 139
 140 /* Magic for libthread_db to know how to do THREAD_SELF.  */
 141 # define DB_THREAD_SELF REGISTER (64, 64, 13 * 8, -TLS_PRE_TCB_SIZE)
 142
 143 /* Access to data in the thread descriptor is easy.  */
 144 #define THREAD_GETMEM(descr, member) \
 145   descr->member
 146 #define THREAD_GETMEM_NC(descr, member, idx) \
 147   descr->member[idx]
 148 #define THREAD_SETMEM(descr, member, value) \
 149   descr->member = (value)
 150 #define THREAD_SETMEM_NC(descr, member, idx, value) \
 151   descr->member[idx] = (value)
 152
 153 /* Set the stack guard field in TCB head.  */
 154 #define THREAD_SET_STACK_GUARD(value) \
 155   (((uintptr_t *) __thread_self)[-1] = (value))
 156 #define THREAD_COPY_STACK_GUARD(descr) \
 157   (((uintptr_t *) ((char *) (descr) + TLS_PRE_TCB_SIZE))[-1] \
 158    = ((uintptr_t *) __thread_self)[-1])
 159
 160 /* Set the pointer guard field in TCB head.  */
 161 #define THREAD_GET_POINTER_GUARD() \
 162   (((uintptr_t *) __thread_self)[-2])
 163 #define THREAD_SET_POINTER_GUARD(value) \
 164   (((uintptr_t *) __thread_self)[-2] = (value))
 165 #define THREAD_COPY_POINTER_GUARD(descr) \
 166   (((uintptr_t *) ((char *) (descr) + TLS_PRE_TCB_SIZE))[-2] \
 167    = THREAD_GET_POINTER_GUARD ())
 168
 169 /* Get and set the global scope generation counter in struct pthread.  */
 170 #define THREAD_GSCOPE_FLAG_UNUSED 0
 171 #define THREAD_GSCOPE_FLAG_USED   1
 172 #define THREAD_GSCOPE_FLAG_WAIT   2
 173 #define THREAD_GSCOPE_RESET_FLAG() \
 174   do                                                                         \
 175     { int __res                                                              \
 176         = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag,             \
 177                                THREAD_GSCOPE_FLAG_UNUSED);                   \
 178       if (__res == THREAD_GSCOPE_FLAG_WAIT)                                  \
 179         lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1);                \
 180     }                                                                        \
 181   while (0)
 182 #define THREAD_GSCOPE_SET_FLAG() \
 183   do                                                                         \
 184     {                                                                        \
 185       THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED;             \
 186       atomic_write_barrier ();                                               \
 187     }                                                                        \
 188   while (0)
 189 #define THREAD_GSCOPE_WAIT() \
 190   GL(dl_wait_lookup_done) ()
 191
 192 #endif /* __ASSEMBLER__ */
 193
 194 #endif  /* tls.h */