nptl/sysdeps/ia64/tls.h

   1 /* Definition for thread-local data handling.  nptl/IA-64 version.
   2    Copyright (C) 2003, 2004 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 <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   void *pointer;
  36 } dtv_t;
  37
  38
  39 typedef struct
  40 {
  41   dtv_t *dtv;
  42   void *private;
  43 } tcbhead_t;
  44
  45 register struct pthread *__thread_self __asm__("r13");
  46
  47 # define TLS_MULTIPLE_THREADS_IN_TCB 1
  48
  49 #else /* __ASSEMBLER__ */
  50 # include <tcb-offsets.h>
  51 #endif
  52
  53
  54 /* We require TLS support in the tools.  */
  55 #ifndef HAVE_TLS_SUPPORT
  56 # error "TLS support is required."
  57 #endif
  58
  59 /* Signal that TLS support is available.  */
  60 #define USE_TLS 1
  61
  62 /* Alignment requirement for the stack.  */
  63 #define STACK_ALIGN     16
  64
  65 #ifndef __ASSEMBLER__
  66 /* Get system call information.  */
  67 # include <sysdep.h>
  68
  69 /* This is the size of the initial TCB.  */
  70 # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
  71
  72 /* Alignment requirements for the initial TCB.  */
  73 # define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t)
  74
  75 /* This is the size of the TCB.  */
  76 # define TLS_TCB_SIZE sizeof (tcbhead_t)
  77
  78 /* This is the size we need before TCB.  */
  79 # define TLS_PRE_TCB_SIZE sizeof (struct pthread)
  80
  81 /* Alignment requirements for the TCB.  */
  82 # define TLS_TCB_ALIGN __alignof__ (struct pthread)
  83
  84 /* The DTV is allocated at the TP; the TCB is placed elsewhere.  */
  85 # define TLS_DTV_AT_TP  1
  86
  87 /* Get the thread descriptor definition.  */
  88 # include <nptl/descr.h>
  89
  90 /* Install the dtv pointer.  The pointer passed is to the element with
  91    index -1 which contain the length.  */
  92 #  define INSTALL_DTV(descr, dtvp) \
  93   ((tcbhead_t *) (descr))->dtv = (dtvp) + 1
  94
  95 /* Install new dtv for current thread.  */
  96 #  define INSTALL_NEW_DTV(DTV) \
  97   (((tcbhead_t *)__thread_self)->dtv = (DTV))
  98
  99 /* Return dtv of given thread descriptor.  */
 100 #  define GET_DTV(descr) \
 101   (((tcbhead_t *) (descr))->dtv)
 102
 103 #define THREAD_SELF_SYSINFO     (((tcbhead_t *) __thread_self)->private)
 104 #define THREAD_SYSINFO(pd)      (((tcbhead_t *) ((pd) + 1))->private)
 105
 106 #if defined NEED_DL_SYSINFO
 107 # define INIT_SYSINFO   THREAD_SELF_SYSINFO = (void *) GLRO(dl_sysinfo)
 108 #else
 109 # define INIT_SYSINFO   NULL
 110 #endif
 111
 112 /* Code to initially initialize the thread pointer.  This might need
 113    special attention since 'errno' is not yet available and if the
 114    operation can cause a failure 'errno' must not be touched.  */
 115 # define TLS_INIT_TP(thrdescr, secondcall) \
 116   (__thread_self = (thrdescr), INIT_SYSINFO, NULL)
 117
 118 /* Return the address of the dtv for the current thread.  */
 119 #  define THREAD_DTV() \
 120   (((tcbhead_t *)__thread_self)->dtv)
 121
 122 /* Return the thread descriptor for the current thread.  */
 123 # define THREAD_SELF (__thread_self - 1)
 124
 125 /* Magic for libthread_db to know how to do THREAD_SELF.  */
 126 # define DB_THREAD_SELF REGISTER (64, 64, 13 * 8, -sizeof (struct pthread))
 127
 128 /* Access to data in the thread descriptor is easy.  */
 129 #define THREAD_GETMEM(descr, member) \
 130   descr->member
 131 #define THREAD_GETMEM_NC(descr, member, idx) \
 132   descr->member[idx]
 133 #define THREAD_SETMEM(descr, member, value) \
 134   descr->member = (value)
 135 #define THREAD_SETMEM_NC(descr, member, idx, value) \
 136   descr->member[idx] = (value)
 137
 138 #endif /* __ASSEMBLER__ */
 139
 140 #endif  /* tls.h */