sysdeps/microblaze/nptl/tls.h

   1 /* Copyright (C) 2005-2014 Free Software Foundation, Inc.
   2
   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 License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    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
  24 #ifndef __ASSEMBLER__
  25 # include <stdbool.h>
  26 # include <stddef.h>
  27 # include <stdint.h>
  28
  29 /* Type for the dtv.  */
  30 typedef union dtv
  31 {
  32   size_t counter;
  33   struct
  34   {
  35     void *val;
  36     bool is_static;
  37   } pointer;
  38 } dtv_t;
  39
  40 #else /* __ASSEMBLER__ */
  41 # include <tcb-offsets.h>
  42 #endif /* __ASSEMBLER__ */
  43
  44 #ifndef __ASSEMBLER__
  45
  46 /* Get system call information.  */
  47 # include <sysdep.h>
  48
  49 /* The TP points to the start of the thread blocks.  */
  50 # define TLS_DTV_AT_TP  1
  51 # define TLS_TCB_AT_TP  0
  52
  53 /* Get the thread descriptor definition.  */
  54 # include <nptl/descr.h>
  55
  56 typedef struct
  57 {
  58   dtv_t *dtv;
  59   void *private;
  60 } tcbhead_t;
  61
  62 static inline void *__microblaze_get_thread_area (void)
  63 {
  64   register void * volatile __microblaze_thread_area asm ("r21");
  65   return (void *) __microblaze_thread_area;
  66 }
  67
  68 # define READ_THREAD_POINTER() \
  69   ({ __microblaze_get_thread_area(); })
  70
  71 /* This is the size of the initial TCB.  */
  72 # define TLS_INIT_TCB_SIZE  sizeof (tcbhead_t)
  73
  74 /* Alignment requirements for the initial TCB.  */
  75 # define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t)
  76
  77 /* This is the size of the TCB.  */
  78 # define TLS_TCB_SIZE       sizeof (tcbhead_t)
  79
  80 /* This is the size we need before TCB.  */
  81 # define TLS_PRE_TCB_SIZE   sizeof (struct pthread)
  82
  83 /* Alignment requirements for the TCB.  */
  84 # define TLS_TCB_ALIGN      __alignof__ (struct pthread)
  85
  86 /* Install the dtv pointer.  The pointer passed is to the element with
  87    index -1 which contain the length.  */
  88 # define INSTALL_DTV(tcbp, dtvp) \
  89   (((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1)
  90
  91 /* Install new dtv for current thread.  */
  92 # define INSTALL_NEW_DTV(dtv) \
  93   (THREAD_DTV() = (dtv))
  94
  95 /* Return dtv of given thread descriptor.  */
  96 # define GET_DTV(tcbp) \
  97   (((tcbhead_t *) (tcbp))->dtv)
  98
  99 /* Code to initially initialize the thread pointer.
 100    r21 is reserved for thread pointer.  */
 101 # define TLS_INIT_TP(tcbp) \
 102   ({ __asm __volatile ("or r21,r0,%0" : : "r" ((void *)tcbp)); 0; })
 103
 104 # define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) + 1
 105
 106 /* Return the address of the dtv for the current thread.  */
 107 # define THREAD_DTV() \
 108   (((tcbhead_t *) READ_THREAD_POINTER())->dtv)
 109
 110 /* Return the thread descriptor for the current thread.  */
 111 # define THREAD_SELF \
 112   (((struct pthread *) READ_THREAD_POINTER()) - 1)
 113
 114 /* Magic for libthread_db to know how to do THREAD_SELF.  */
 115 # define DB_THREAD_SELF \
 116   CONST_THREAD_AREA (32, sizeof (struct pthread))
 117
 118 /* Read member of the thread descriptor directly.  */
 119 # define THREAD_GETMEM(descr, member) (descr->member)
 120
 121 /* Same as THREAD_GETMEM, but the member offset can be non-constant.  */
 122 # define THREAD_GETMEM_NC(descr, member, idx) \
 123   (descr->member[idx])
 124
 125 /* Set member of the thread descriptor directly.  */
 126 # define THREAD_SETMEM(descr, member, value) \
 127   (descr->member = (value))
 128
 129 /* Same as THREAD_SETMEM, but the member offset can be non-constant.  */
 130 # define THREAD_SETMEM_NC(descr, member, idx, value) \
 131   (descr->member[idx] = (value))
 132
 133 /* Get and set the global scope generation counter in struct pthread.  */
 134 # define THREAD_GSCOPE_FLAG_UNUSED 0
 135 # define THREAD_GSCOPE_FLAG_USED   1
 136 # define THREAD_GSCOPE_FLAG_WAIT   2
 137 # define THREAD_GSCOPE_RESET_FLAG()                                         \
 138   do                                                                        \
 139     { int __res                                                             \
 140       = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag,              \
 141                              THREAD_GSCOPE_FLAG_UNUSED);                    \
 142       if (__res == THREAD_GSCOPE_FLAG_WAIT)                                 \
 143         lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE);  \
 144     }                                                                       \
 145   while (0)
 146 # define THREAD_GSCOPE_SET_FLAG()                                           \
 147   do                                                                        \
 148     {                                                                       \
 149       THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED;            \
 150       atomic_write_barrier ();                                              \
 151     }                                                                       \
 152   while (0)
 153 # define THREAD_GSCOPE_WAIT() \
 154   GL (dl_wait_lookup_done) ()
 155
 156 #endif /* __ASSEMBLER__ */
 157
 158 #endif /* tls.h.  */