ports/sysdeps/ia64/nptl/tls.h

   1 /* Definition for thread-local data handling.  nptl/IA-64 version.
   2    Copyright (C) 2003-2014 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 #include <dl-sysdep.h>
  23 #ifndef __ASSEMBLER__
  24 # include <stdbool.h>
  25 # include <stddef.h>
  26 # include <stdint.h>
  27 # include <stdlib.h>
  28 # include <list.h>
  29
  30
  31 /* Type for the dtv.  */
  32 typedef union dtv
  33 {
  34   size_t counter;
  35   struct
  36   {
  37     void *val;
  38     bool is_static;
  39   } pointer;
  40 } dtv_t;
  41
  42
  43 typedef struct
  44 {
  45   dtv_t *dtv;
  46   void *__private;
  47 } tcbhead_t;
  48
  49 register struct pthread *__thread_self __asm__("r13");
  50
  51 # define TLS_MULTIPLE_THREADS_IN_TCB 1
  52
  53 #else /* __ASSEMBLER__ */
  54 # include <tcb-offsets.h>
  55 #endif
  56
  57
  58 /* Alignment requirement for the stack.  */
  59 #define STACK_ALIGN     16
  60
  61 #ifndef __ASSEMBLER__
  62 /* Get system call information.  */
  63 # include <sysdep.h>
  64
  65 /* This is the size of the initial TCB.  */
  66 # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
  67
  68 /* Alignment requirements for the initial TCB.  */
  69 # define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t)
  70
  71 /* This is the size of the TCB.  */
  72 # define TLS_TCB_SIZE sizeof (tcbhead_t)
  73
  74 /* This is the size we need before TCB.
  75    If there is not any room for uintptr_t stack_guard and
  76    uintptr_t pointer_guard in struct pthread's final padding,
  77    we need to put struct pthread 16 byte slower.  */
  78 # define TLS_PRE_TCB_SIZE \
  79   (sizeof (struct pthread)                                              \
  80    + (PTHREAD_STRUCT_END_PADDING < 2 * sizeof (uintptr_t)               \
  81       ? ((2 * sizeof (uintptr_t) + __alignof__ (struct pthread) - 1)    \
  82          & ~(__alignof__ (struct pthread) - 1))                         \
  83       : 0))
  84
  85 /* Alignment requirements for the TCB.  */
  86 # define TLS_TCB_ALIGN __alignof__ (struct pthread)
  87
  88 /* The DTV is allocated at the TP; the TCB is placed elsewhere.  */
  89 # define TLS_DTV_AT_TP  1
  90
  91 /* Get the thread descriptor definition.  */
  92 # include <nptl/descr.h>
  93
  94 /* Install the dtv pointer.  The pointer passed is to the element with
  95    index -1 which contain the length.  */
  96 #  define INSTALL_DTV(descr, dtvp) \
  97   ((tcbhead_t *) (descr))->dtv = (dtvp) + 1
  98
  99 /* Install new dtv for current thread.  */
 100 #  define INSTALL_NEW_DTV(DTV) \
 101   (((tcbhead_t *)__thread_self)->dtv = (DTV))
 102
 103 /* Return dtv of given thread descriptor.  */
 104 #  define GET_DTV(descr) \
 105   (((tcbhead_t *) (descr))->dtv)
 106
 107 #define THREAD_SELF_SYSINFO     (((tcbhead_t *) __thread_self)->__private)
 108 #define THREAD_SYSINFO(pd) \
 109   (((tcbhead_t *) ((char *) (pd) + TLS_PRE_TCB_SIZE))->__private)
 110
 111 #if defined NEED_DL_SYSINFO
 112 # define INIT_SYSINFO   THREAD_SELF_SYSINFO = (void *) GLRO(dl_sysinfo)
 113 #else
 114 # define INIT_SYSINFO   NULL
 115 #endif
 116
 117 /* Code to initially initialize the thread pointer.  This might need
 118    special attention since 'errno' is not yet available and if the
 119    operation can cause a failure 'errno' must not be touched.  */
 120 # define TLS_INIT_TP(thrdescr, secondcall) \
 121   (__thread_self = (thrdescr), INIT_SYSINFO, NULL)
 122
 123 /* Return the address of the dtv for the current thread.  */
 124 #  define THREAD_DTV() \
 125   (((tcbhead_t *)__thread_self)->dtv)
 126
 127 /* Return the thread descriptor for the current thread.  */
 128 # define THREAD_SELF \
 129   ((struct pthread *) ((char *) __thread_self - TLS_PRE_TCB_SIZE))
 130
 131 /* Magic for libthread_db to know how to do THREAD_SELF.  */
 132 # define DB_THREAD_SELF REGISTER (64, 64, 13 * 8, -TLS_PRE_TCB_SIZE)
 133
 134 /* Access to data in the thread descriptor is easy.  */
 135 #define THREAD_GETMEM(descr, member) \
 136   descr->member
 137 #define THREAD_GETMEM_NC(descr, member, idx) \
 138   descr->member[idx]
 139 #define THREAD_SETMEM(descr, member, value) \
 140   descr->member = (value)
 141 #define THREAD_SETMEM_NC(descr, member, idx, value) \
 142   descr->member[idx] = (value)
 143
 144 /* Set the stack guard field in TCB head.  */
 145 #define THREAD_SET_STACK_GUARD(value) \
 146   (((uintptr_t *) __thread_self)[-1] = (value))
 147 #define THREAD_COPY_STACK_GUARD(descr) \
 148   (((uintptr_t *) ((char *) (descr) + TLS_PRE_TCB_SIZE))[-1] \
 149    = ((uintptr_t *) __thread_self)[-1])
 150
 151 /* Set the pointer guard field in TCB head.  */
 152 #define THREAD_GET_POINTER_GUARD() \
 153   (((uintptr_t *) __thread_self)[-2])
 154 #define THREAD_SET_POINTER_GUARD(value) \
 155   (((uintptr_t *) __thread_self)[-2] = (value))
 156 #define THREAD_COPY_POINTER_GUARD(descr) \
 157   (((uintptr_t *) ((char *) (descr) + TLS_PRE_TCB_SIZE))[-2] \
 158    = THREAD_GET_POINTER_GUARD ())
 159
 160 /* Get and set the global scope generation counter in struct pthread.  */
 161 #define THREAD_GSCOPE_FLAG_UNUSED 0
 162 #define THREAD_GSCOPE_FLAG_USED   1
 163 #define THREAD_GSCOPE_FLAG_WAIT   2
 164 #define THREAD_GSCOPE_RESET_FLAG() \
 165   do                                                                         \
 166     { int __res                                                              \
 167         = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag,             \
 168                                THREAD_GSCOPE_FLAG_UNUSED);                   \
 169       if (__res == THREAD_GSCOPE_FLAG_WAIT)                                  \
 170         lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE);   \
 171     }                                                                        \
 172   while (0)
 173 #define THREAD_GSCOPE_SET_FLAG() \
 174   do                                                                         \
 175     {                                                                        \
 176       THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED;             \
 177       atomic_write_barrier ();                                               \
 178     }                                                                        \
 179   while (0)
 180 #define THREAD_GSCOPE_WAIT() \
 181   GL(dl_wait_lookup_done) ()
 182
 183 #endif /* __ASSEMBLER__ */
 184
 185 #endif  /* tls.h */