nptl/sysdeps/sparc/tls.h

   1 /* Definitions for thread-local data handling.  NPTL/sparc 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 #ifndef __ASSEMBLER__
  24 # include <stdbool.h>
  25 # include <stddef.h>
  26 # include <stdint.h>
  27 # include <stdlib.h>
  28 # include <list.h>
  29 # include <kernel-features.h>
  30
  31 /* Type for the dtv.  */
  32 typedef union dtv
  33 {
  34   size_t counter;
  35   struct
  36   {
  37     void *val;
  38     bool is_static;
  39   } pointer;
  40 } dtv_t;
  41
  42 typedef struct
  43 {
  44   void *tcb;            /* Pointer to the TCB.  Not necessary the
  45                            thread descriptor used by libpthread.  */
  46   dtv_t *dtv;
  47   void *self;
  48   int multiple_threads;
  49 #if __WORDSIZE == 64
  50   int gscope_flag;
  51 #endif
  52   uintptr_t sysinfo;
  53   uintptr_t stack_guard;
  54   uintptr_t pointer_guard;
  55 #if __WORDSIZE != 64
  56   int gscope_flag;
  57 #endif
  58 #ifndef __ASSUME_PRIVATE_FUTEX
  59   int private_futex;
  60 #endif
  61 } tcbhead_t;
  62
  63 #else /* __ASSEMBLER__ */
  64 # include <tcb-offsets.h>
  65 #endif /* __ASSEMBLER__ */
  66
  67
  68 #ifndef __ASSEMBLER__
  69 /* Get system call information.  */
  70 # include <sysdep.h>
  71
  72 /* Get the thread descriptor definition.  */
  73 # include <nptl/descr.h>
  74
  75 register struct pthread *__thread_self __asm__("%g7");
  76
  77 /* This is the size of the initial TCB.  Can't be just sizeof (tcbhead_t),
  78    because NPTL getpid, __libc_alloca_cutoff etc. need (almost) the whole
  79    struct pthread even when not linked with -lpthread.  */
  80 # define TLS_INIT_TCB_SIZE sizeof (struct pthread)
  81
  82 /* Alignment requirements for the initial TCB.  */
  83 # define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread)
  84
  85 /* This is the size of the TCB.  */
  86 # define TLS_TCB_SIZE sizeof (struct pthread)
  87
  88 /* Alignment requirements for the TCB.  */
  89 # define TLS_TCB_ALIGN __alignof__ (struct pthread)
  90
  91 /* The TCB can have any size and the memory following the address the
  92    thread pointer points to is unspecified.  Allocate the TCB there.  */
  93 # define TLS_TCB_AT_TP  1
  94
  95 /* Install the dtv pointer.  The pointer passed is to the element with
  96    index -1 which contain the length.  */
  97 # define INSTALL_DTV(descr, dtvp) \
  98   ((tcbhead_t *) (descr))->dtv = (dtvp) + 1
  99
 100 /* Install new dtv for current thread.  */
 101 # define INSTALL_NEW_DTV(DTV) \
 102   (((tcbhead_t *) __thread_self)->dtv = (DTV))
 103
 104 /* Return dtv of given thread descriptor.  */
 105 # define GET_DTV(descr) \
 106   (((tcbhead_t *) (descr))->dtv)
 107
 108 /* Code to initially initialize the thread pointer.  */
 109 # define TLS_INIT_TP(descr, secondcall) \
 110   (__thread_self = (__typeof (__thread_self)) (descr), NULL)
 111
 112 /* Return the address of the dtv for the current thread.  */
 113 # define THREAD_DTV() \
 114   (((tcbhead_t *) __thread_self)->dtv)
 115
 116 /* Return the thread descriptor for the current thread.  */
 117 #define THREAD_SELF  __thread_self
 118
 119 /* Magic for libthread_db to know how to do THREAD_SELF.  */
 120 # define DB_THREAD_SELF \
 121   REGISTER (32, 32, 10 * 4, 0) \
 122   REGISTER (64, __WORDSIZE, (6 * 8) + (__WORDSIZE==64?0:4), 0)
 123
 124 /* Access to data in the thread descriptor is easy.  */
 125 #define THREAD_GETMEM(descr, member) \
 126   descr->member
 127 #define THREAD_GETMEM_NC(descr, member, idx) \
 128   descr->member[idx]
 129 #define THREAD_SETMEM(descr, member, value) \
 130   descr->member = (value)
 131 #define THREAD_SETMEM_NC(descr, member, idx, value) \
 132   descr->member[idx] = (value)
 133
 134 /* Set the stack guard field in TCB head.  */
 135 #define THREAD_SET_STACK_GUARD(value) \
 136   THREAD_SETMEM (THREAD_SELF, header.stack_guard, value)
 137 # define THREAD_COPY_STACK_GUARD(descr) \
 138   ((descr)->header.stack_guard \
 139    = THREAD_GETMEM (THREAD_SELF, header.stack_guard))
 140
 141 /* Get/set the stack guard field in TCB head.  */
 142 #define THREAD_GET_POINTER_GUARD() \
 143   THREAD_GETMEM (THREAD_SELF, header.pointer_guard)
 144 #define THREAD_SET_POINTER_GUARD(value) \
 145   THREAD_SETMEM (THREAD_SELF, header.pointer_guard, value)
 146 # define THREAD_COPY_POINTER_GUARD(descr) \
 147   ((descr)->header.pointer_guard = THREAD_GET_POINTER_GUARD ())
 148
 149 /* Get and set the global scope generation counter in struct pthread.  */
 150 #define THREAD_GSCOPE_FLAG_UNUSED 0
 151 #define THREAD_GSCOPE_FLAG_USED   1
 152 #define THREAD_GSCOPE_FLAG_WAIT   2
 153 #define THREAD_GSCOPE_RESET_FLAG() \
 154   do                                                                         \
 155     { int __res                                                              \
 156         = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag,             \
 157                                THREAD_GSCOPE_FLAG_UNUSED);                   \
 158       if (__res == THREAD_GSCOPE_FLAG_WAIT)                                  \
 159         lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE);   \
 160     }                                                                        \
 161   while (0)
 162 #define THREAD_GSCOPE_SET_FLAG() \
 163   do                                                                         \
 164     {                                                                        \
 165       THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED;             \
 166       atomic_write_barrier ();                                               \
 167     }                                                                        \
 168   while (0)
 169 #define THREAD_GSCOPE_WAIT() \
 170   GL(dl_wait_lookup_done) ()
 171
 172 #endif /* !ASSEMBLER */
 173
 174 #endif  /* tls.h */