nptl/sysdeps/sh/tls.h

   1 /* Definition for thread-local data handling.  NPTL/SH version.
   2    Copyright (C) 2003, 2005, 2006, 2007 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
  22
  23 # include <dl-sysdep.h>
  24
  25 #ifndef __ASSEMBLER__
  26 # include <stdbool.h>
  27 # include <stddef.h>
  28 # include <stdint.h>
  29
  30 /* Type for the dtv.  */
  31 typedef union dtv
  32 {
  33   size_t counter;
  34   struct
  35   {
  36     void *val;
  37     bool is_static;
  38   } pointer;
  39 } dtv_t;
  40
  41 typedef struct
  42 {
  43   dtv_t *dtv;
  44   uintptr_t pointer_guard;
  45 } tcbhead_t;
  46
  47 # define TLS_MULTIPLE_THREADS_IN_TCB 1
  48
  49 #else /* __ASSEMBLER__ */
  50 # include <tcb-offsets.h>
  51 #endif /* __ASSEMBLER__ */
  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 #ifndef __ASSEMBLER__
  60
  61 /* Get system call information.  */
  62 # include <sysdep.h>
  63
  64 /* This is the size of the initial TCB.  */
  65 # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
  66
  67 /* Alignment requirements for the initial TCB.  */
  68 # define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t)
  69
  70 /* This is the size of the TCB.  */
  71 # define TLS_TCB_SIZE sizeof (tcbhead_t)
  72
  73 /* This is the size we need before TCB.  */
  74 # define TLS_PRE_TCB_SIZE sizeof (struct pthread)
  75
  76 /* Alignment requirements for the TCB.  */
  77 # define TLS_TCB_ALIGN __alignof__ (struct pthread)
  78
  79 /* The TLS blocks start right after the TCB.  */
  80 # define TLS_DTV_AT_TP  1
  81
  82 /* Get the thread descriptor definition.  */
  83 # include <nptl/descr.h>
  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   ({ tcbhead_t *__tcbp;                                                       \
  93      __asm __volatile ("stc gbr,%0" : "=r" (__tcbp));                         \
  94      __tcbp->dtv = (dtv);})
  95
  96 /* Return dtv of given thread descriptor.  */
  97 # define GET_DTV(tcbp) \
  98   (((tcbhead_t *) (tcbp))->dtv)
  99
 100 /* Code to initially initialize the thread pointer.  This might need
 101    special attention since 'errno' is not yet available and if the
 102    operation can cause a failure 'errno' must not be touched.  */
 103 # define TLS_INIT_TP(tcbp, secondcall) \
 104   ({ __asm __volatile ("ldc %0,gbr" : : "r" (tcbp)); 0; })
 105
 106 /* Return the address of the dtv for the current thread.  */
 107 # define THREAD_DTV() \
 108   ({ tcbhead_t *__tcbp;                                                       \
 109      __asm __volatile ("stc gbr,%0" : "=r" (__tcbp));                         \
 110      __tcbp->dtv;})
 111
 112 /* Return the thread descriptor for the current thread.
 113    The contained asm must *not* be marked volatile since otherwise
 114    assignments like
 115         struct pthread *self = thread_self();
 116    do not get optimized away.  */
 117 # define THREAD_SELF \
 118   ({ struct pthread *__self;                                                  \
 119      __asm ("stc gbr,%0" : "=r" (__self));                                    \
 120      __self - 1;})
 121
 122 /* Magic for libthread_db to know how to do THREAD_SELF.  */
 123 # define DB_THREAD_SELF \
 124   REGISTER (32, 32, REG_GBR * 4, -sizeof (struct pthread))
 125
 126 /* Read member of the thread descriptor directly.  */
 127 # define THREAD_GETMEM(descr, member) (descr->member)
 128
 129 /* Same as THREAD_GETMEM, but the member offset can be non-constant.  */
 130 # define THREAD_GETMEM_NC(descr, member, idx) (descr->member[idx])
 131
 132 /* Set member of the thread descriptor directly.  */
 133 # define THREAD_SETMEM(descr, member, value) \
 134     descr->member = (value)
 135
 136 /* Same as THREAD_SETMEM, but the member offset can be non-constant.  */
 137 # define THREAD_SETMEM_NC(descr, member, idx, value) \
 138     descr->member[idx] = (value)
 139
 140 #define THREAD_GET_POINTER_GUARD() \
 141   ({ tcbhead_t *__tcbp;                                                       \
 142      __asm __volatile ("stc gbr,%0" : "=r" (__tcbp));                         \
 143      __tcbp->pointer_guard;})
 144  #define THREAD_SET_POINTER_GUARD(value) \
 145   ({ tcbhead_t *__tcbp;                                                       \
 146      __asm __volatile ("stc gbr,%0" : "=r" (__tcbp));                         \
 147      __tcbp->pointer_guard = (value);})
 148 #define THREAD_COPY_POINTER_GUARD(descr) \
 149   ({ tcbhead_t *__tcbp;                                                       \
 150      __asm __volatile ("stc gbr,%0" : "=r" (__tcbp));                         \
 151      ((tcbhead_t *) (descr + 1))->pointer_guard = __tcbp->pointer_guard;})
 152
 153 /* Get and set the global scope generation counter in struct pthread.  */
 154 #define THREAD_GSCOPE_FLAG_UNUSED 0
 155 #define THREAD_GSCOPE_FLAG_USED   1
 156 #define THREAD_GSCOPE_FLAG_WAIT   2
 157 #define THREAD_GSCOPE_RESET_FLAG() \
 158   do                                                                         \
 159     { int __res                                                              \
 160         = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag,             \
 161                                THREAD_GSCOPE_FLAG_UNUSED);                   \
 162       if (__res == THREAD_GSCOPE_FLAG_WAIT)                                  \
 163         lll_private_futex_wake (&THREAD_SELF->header.gscope_flag, 1);        \
 164     }                                                                        \
 165   while (0)
 166 #define THREAD_GSCOPE_SET_FLAG() \
 167   do                                                                         \
 168     {                                                                        \
 169       THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED;             \
 170       atomic_write_barrier ();                                               \
 171     }                                                                        \
 172   while (0)
 173 #define THREAD_GSCOPE_WAIT() \
 174   GL(dl_wait_lookup_done) ()
 175
 176 #endif /* __ASSEMBLER__ */
 177
 178 #endif  /* tls.h */