nptl/sysdeps/sh/tls.h

   1 /* Definition for thread-local data handling.  NPTL/SH 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
  21
  22 # include <dl-sysdep.h>
  23
  24 #ifndef __ASSEMBLER__
  25 # include <stdbool.h>
  26 # include <stddef.h>
  27 # include <stdint.h>
  28 # include <stdlib.h>
  29 # include <list.h>
  30 # include <sysdep.h>
  31 # include <kernel-features.h>
  32
  33 /* Type for the dtv.  */
  34 typedef union dtv
  35 {
  36   size_t counter;
  37   struct
  38   {
  39     void *val;
  40     bool is_static;
  41   } pointer;
  42 } dtv_t;
  43
  44 typedef struct
  45 {
  46   dtv_t *dtv;
  47   uintptr_t pointer_guard;
  48 } tcbhead_t;
  49
  50 # define TLS_MULTIPLE_THREADS_IN_TCB 1
  51
  52 #else /* __ASSEMBLER__ */
  53 # include <tcb-offsets.h>
  54 #endif /* __ASSEMBLER__ */
  55
  56
  57 #ifndef __ASSEMBLER__
  58
  59 /* Get system call information.  */
  60 # include <sysdep.h>
  61
  62 /* This is the size of the initial TCB.  */
  63 # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
  64
  65 /* Alignment requirements for the initial TCB.  */
  66 # define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t)
  67
  68 /* This is the size of the TCB.  */
  69 # define TLS_TCB_SIZE sizeof (tcbhead_t)
  70
  71 /* This is the size we need before TCB.  */
  72 # define TLS_PRE_TCB_SIZE sizeof (struct pthread)
  73
  74 /* Alignment requirements for the TCB.  */
  75 # define TLS_TCB_ALIGN __alignof__ (struct pthread)
  76
  77 /* The TLS blocks start right after the TCB.  */
  78 # define TLS_DTV_AT_TP  1
  79
  80 /* Get the thread descriptor definition.  */
  81 # include <nptl/descr.h>
  82
  83 /* Install the dtv pointer.  The pointer passed is to the element with
  84    index -1 which contain the length.  */
  85 # define INSTALL_DTV(tcbp, dtvp) \
  86   ((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1
  87
  88 /* Install new dtv for current thread.  */
  89 # define INSTALL_NEW_DTV(dtv) \
  90   ({ tcbhead_t *__tcbp;                                                       \
  91      __asm __volatile ("stc gbr,%0" : "=r" (__tcbp));                         \
  92      __tcbp->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.  This might need
  99    special attention since 'errno' is not yet available and if the
 100    operation can cause a failure 'errno' must not be touched.  */
 101 # define TLS_INIT_TP(tcbp, secondcall) \
 102   ({ __asm __volatile ("ldc %0,gbr" : : "r" (tcbp)); 0; })
 103
 104 /* Return the address of the dtv for the current thread.  */
 105 # define THREAD_DTV() \
 106   ({ tcbhead_t *__tcbp;                                                       \
 107      __asm __volatile ("stc gbr,%0" : "=r" (__tcbp));                         \
 108      __tcbp->dtv;})
 109
 110 /* Return the thread descriptor for the current thread.
 111    The contained asm must *not* be marked volatile since otherwise
 112    assignments like
 113         struct pthread *self = thread_self();
 114    do not get optimized away.  */
 115 # define THREAD_SELF \
 116   ({ struct pthread *__self;                                                  \
 117      __asm ("stc gbr,%0" : "=r" (__self));                                    \
 118      __self - 1;})
 119
 120 /* Magic for libthread_db to know how to do THREAD_SELF.  */
 121 # define DB_THREAD_SELF \
 122   REGISTER (32, 32, REG_GBR * 4, -sizeof (struct pthread))
 123
 124 /* Read member of the thread descriptor directly.  */
 125 # define THREAD_GETMEM(descr, member) (descr->member)
 126
 127 /* Same as THREAD_GETMEM, but the member offset can be non-constant.  */
 128 # define THREAD_GETMEM_NC(descr, member, idx) (descr->member[idx])
 129
 130 /* Set member of the thread descriptor directly.  */
 131 # define THREAD_SETMEM(descr, member, value) \
 132     descr->member = (value)
 133
 134 /* Same as THREAD_SETMEM, but the member offset can be non-constant.  */
 135 # define THREAD_SETMEM_NC(descr, member, idx, value) \
 136     descr->member[idx] = (value)
 137
 138 #define THREAD_GET_POINTER_GUARD() \
 139   ({ tcbhead_t *__tcbp;                                                       \
 140      __asm __volatile ("stc gbr,%0" : "=r" (__tcbp));                         \
 141      __tcbp->pointer_guard;})
 142  #define THREAD_SET_POINTER_GUARD(value) \
 143   ({ tcbhead_t *__tcbp;                                                       \
 144      __asm __volatile ("stc gbr,%0" : "=r" (__tcbp));                         \
 145      __tcbp->pointer_guard = (value);})
 146 #define THREAD_COPY_POINTER_GUARD(descr) \
 147   ({ tcbhead_t *__tcbp;                                                       \
 148      __asm __volatile ("stc gbr,%0" : "=r" (__tcbp));                         \
 149      ((tcbhead_t *) (descr + 1))->pointer_guard = __tcbp->pointer_guard;})
 150
 151 /* Get and set the global scope generation counter in struct pthread.  */
 152 #define THREAD_GSCOPE_FLAG_UNUSED 0
 153 #define THREAD_GSCOPE_FLAG_USED   1
 154 #define THREAD_GSCOPE_FLAG_WAIT   2
 155 #define THREAD_GSCOPE_RESET_FLAG() \
 156   do                                                                         \
 157     { int __res                                                              \
 158         = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag,             \
 159                                THREAD_GSCOPE_FLAG_UNUSED);                   \
 160       if (__res == THREAD_GSCOPE_FLAG_WAIT)                                  \
 161         lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE);   \
 162     }                                                                        \
 163   while (0)
 164 #define THREAD_GSCOPE_SET_FLAG() \
 165   do                                                                         \
 166     {                                                                        \
 167       THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED;             \
 168       atomic_write_barrier ();                                               \
 169     }                                                                        \
 170   while (0)
 171 #define THREAD_GSCOPE_WAIT() \
 172   GL(dl_wait_lookup_done) ()
 173
 174 #endif /* __ASSEMBLER__ */
 175
 176 #endif  /* tls.h */