ports/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
  52 /* Get the thread descriptor definition.  */
  53 # include <nptl/descr.h>
  54
  55 typedef struct
  56 {
  57   dtv_t *dtv;
  58   void *private;
  59 } tcbhead_t;
  60
  61 static inline void *__microblaze_get_thread_area (void)
  62 {
  63   register void * volatile __microblaze_thread_area asm ("r21");
  64   return (void *) __microblaze_thread_area;
  65 }
  66
  67 # define READ_THREAD_POINTER() \
  68   ({ __microblaze_get_thread_area(); })
  69
  70 /* This is the size of the initial TCB.  */
  71 # define TLS_INIT_TCB_SIZE  sizeof (tcbhead_t)
  72
  73 /* Alignment requirements for the initial TCB.  */
  74 # define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t)
  75
  76 /* This is the size of the TCB.  */
  77 # define TLS_TCB_SIZE       sizeof (tcbhead_t)
  78
  79 /* This is the size we need before TCB.  */
  80 # define TLS_PRE_TCB_SIZE   sizeof (struct pthread)
  81
  82 /* Alignment requirements for the TCB.  */
  83 # define TLS_TCB_ALIGN      __alignof__ (struct pthread)
  84
  85 /* Install the dtv pointer.  The pointer passed is to the element with
  86    index -1 which contain the length.  */
  87 # define INSTALL_DTV(tcbp, dtvp) \
  88   (((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1)
  89
  90 /* Install new dtv for current thread.  */
  91 # define INSTALL_NEW_DTV(dtv) \
  92   (THREAD_DTV() = (dtv))
  93
  94 /* Return dtv of given thread descriptor.  */
  95 # define GET_DTV(tcbp) \
  96   (((tcbhead_t *) (tcbp))->dtv)
  97
  98 /* Code to initially initialize the thread pointer.
  99    r21 is reserved for thread pointer.  */
 100 # define TLS_INIT_TP(tcbp, secondcall) \
 101   ({ __asm __volatile ("or r21,r0,%0" : : "r" ((void *)tcbp)); 0; })
 102
 103 /* Return the address of the dtv for the current thread.  */
 104 # define THREAD_DTV() \
 105   (((tcbhead_t *) READ_THREAD_POINTER())->dtv)
 106
 107 /* Return the thread descriptor for the current thread.  */
 108 # define THREAD_SELF \
 109   (((struct pthread *) READ_THREAD_POINTER()) - 1)
 110
 111 /* Magic for libthread_db to know how to do THREAD_SELF.  */
 112 # define DB_THREAD_SELF \
 113   CONST_THREAD_AREA (32, sizeof (struct pthread))
 114
 115 /* Read member of the thread descriptor directly.  */
 116 # define THREAD_GETMEM(descr, member) (descr->member)
 117
 118 /* Same as THREAD_GETMEM, but the member offset can be non-constant.  */
 119 # define THREAD_GETMEM_NC(descr, member, idx) \
 120   (descr->member[idx])
 121
 122 /* Set member of the thread descriptor directly.  */
 123 # define THREAD_SETMEM(descr, member, value) \
 124   (descr->member = (value))
 125
 126 /* Same as THREAD_SETMEM, but the member offset can be non-constant.  */
 127 # define THREAD_SETMEM_NC(descr, member, idx, value) \
 128   (descr->member[idx] = (value))
 129
 130 /* Get and set the global scope generation counter in struct pthread.  */
 131 # define THREAD_GSCOPE_FLAG_UNUSED 0
 132 # define THREAD_GSCOPE_FLAG_USED   1
 133 # define THREAD_GSCOPE_FLAG_WAIT   2
 134 # define THREAD_GSCOPE_RESET_FLAG()                                         \
 135   do                                                                        \
 136     { int __res                                                             \
 137       = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag,              \
 138                              THREAD_GSCOPE_FLAG_UNUSED);                    \
 139       if (__res == THREAD_GSCOPE_FLAG_WAIT)                                 \
 140         lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE);  \
 141     }                                                                       \
 142   while (0)
 143 # define THREAD_GSCOPE_SET_FLAG()                                           \
 144   do                                                                        \
 145     {                                                                       \
 146       THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED;            \
 147       atomic_write_barrier ();                                              \
 148     }                                                                       \
 149   while (0)
 150 # define THREAD_GSCOPE_WAIT() \
 151   GL (dl_wait_lookup_done) ()
 152
 153 #endif /* __ASSEMBLER__ */
 154
 155 #endif /* tls.h.  */