nptl/sysdeps/ia64/tls.h

   1 /* Definition for thread-local data handling.  nptl/IA-64 version.
   2    Copyright (C) 2003, 2004, 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, 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 # define TLS_PRE_TCB_SIZE sizeof (struct pthread)
  85
  86 /* Alignment requirements for the TCB.  */
  87 # define TLS_TCB_ALIGN __alignof__ (struct pthread)
  88
  89 /* The DTV is allocated at the TP; the TCB is placed elsewhere.  */
  90 # define TLS_DTV_AT_TP  1
  91
  92 /* Get the thread descriptor definition.  */
  93 # include <nptl/descr.h>
  94
  95 /* Install the dtv pointer.  The pointer passed is to the element with
  96    index -1 which contain the length.  */
  97 #  define INSTALL_DTV(descr, dtvp) \
  98   ((tcbhead_t *) (descr))->dtv = (dtvp) + 1
  99
 100 /* Install new dtv for current thread.  */
 101 #  define INSTALL_NEW_DTV(DTV) \
 102   (((tcbhead_t *)__thread_self)->dtv = (DTV))
 103
 104 /* Return dtv of given thread descriptor.  */
 105 #  define GET_DTV(descr) \
 106   (((tcbhead_t *) (descr))->dtv)
 107
 108 #define THREAD_SELF_SYSINFO     (((tcbhead_t *) __thread_self)->private)
 109 #define THREAD_SYSINFO(pd)      (((tcbhead_t *) ((pd) + 1))->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 (__thread_self - 1)
 129
 130 /* Magic for libthread_db to know how to do THREAD_SELF.  */
 131 # define DB_THREAD_SELF REGISTER (64, 64, 13 * 8, -sizeof (struct pthread))
 132
 133 /* Access to data in the thread descriptor is easy.  */
 134 #define THREAD_GETMEM(descr, member) \
 135   descr->member
 136 #define THREAD_GETMEM_NC(descr, member, idx) \
 137   descr->member[idx]
 138 #define THREAD_SETMEM(descr, member, value) \
 139   descr->member = (value)
 140 #define THREAD_SETMEM_NC(descr, member, idx, value) \
 141   descr->member[idx] = (value)
 142
 143 #endif /* __ASSEMBLER__ */
 144
 145 #endif  /* tls.h */