nptl/sysdeps/sparc/tls.h

   1 /* Definitions for thread-local data handling.  NPTL/sparc 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 #ifndef __ASSEMBLER__
  25 # include <stdbool.h>
  26 # include <stddef.h>
  27 # include <stdint.h>
  28 # include <stdlib.h>
  29 # include <list.h>
  30 # include <kernel-features.h>
  31
  32 /* Type for the dtv.  */
  33 typedef union dtv
  34 {
  35   size_t counter;
  36   struct
  37   {
  38     void *val;
  39     bool is_static;
  40   } pointer;
  41 } dtv_t;
  42
  43 typedef struct
  44 {
  45   void *tcb;            /* Pointer to the TCB.  Not necessary the
  46                            thread descriptor used by libpthread.  */
  47   dtv_t *dtv;
  48   void *self;
  49   int multiple_threads;
  50 #if __WORDSIZE == 64
  51   int gscope_flag;
  52 #endif
  53   uintptr_t sysinfo;
  54   uintptr_t stack_guard;
  55   uintptr_t pointer_guard;
  56 #if __WORDSIZE != 64
  57   int gscope_flag;
  58 #endif
  59 #ifndef __ASSUME_PRIVATE_FUTEX
  60   int private_futex;
  61 #endif
  62 } tcbhead_t;
  63
  64 #else /* __ASSEMBLER__ */
  65 # include <tcb-offsets.h>
  66 #endif /* __ASSEMBLER__ */
  67
  68 /* We require TLS support in the tools.  */
  69 #ifndef HAVE_TLS_SUPPORT
  70 # error "TLS support is required."
  71 #endif
  72
  73 #ifndef __ASSEMBLER__
  74 /* Get system call information.  */
  75 # include <sysdep.h>
  76
  77 /* Get the thread descriptor definition.  */
  78 # include <nptl/descr.h>
  79
  80 register struct pthread *__thread_self __asm__("%g7");
  81
  82 /* This is the size of the initial TCB.  Can't be just sizeof (tcbhead_t),
  83    because NPTL getpid, __libc_alloca_cutoff etc. need (almost) the whole
  84    struct pthread even when not linked with -lpthread.  */
  85 # define TLS_INIT_TCB_SIZE sizeof (struct pthread)
  86
  87 /* Alignment requirements for the initial TCB.  */
  88 # define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread)
  89
  90 /* This is the size of the TCB.  */
  91 # define TLS_TCB_SIZE sizeof (struct pthread)
  92
  93 /* Alignment requirements for the TCB.  */
  94 # define TLS_TCB_ALIGN __alignof__ (struct pthread)
  95
  96 /* The TCB can have any size and the memory following the address the
  97    thread pointer points to is unspecified.  Allocate the TCB there.  */
  98 # define TLS_TCB_AT_TP  1
  99
 100 /* Install the dtv pointer.  The pointer passed is to the element with
 101    index -1 which contain the length.  */
 102 # define INSTALL_DTV(descr, dtvp) \
 103   ((tcbhead_t *) (descr))->dtv = (dtvp) + 1
 104
 105 /* Install new dtv for current thread.  */
 106 # define INSTALL_NEW_DTV(DTV) \
 107   (((tcbhead_t *) __thread_self)->dtv = (DTV))
 108
 109 /* Return dtv of given thread descriptor.  */
 110 # define GET_DTV(descr) \
 111   (((tcbhead_t *) (descr))->dtv)
 112
 113 /* Code to initially initialize the thread pointer.  */
 114 # define TLS_INIT_TP(descr, secondcall) \
 115   (__thread_self = (__typeof (__thread_self)) (descr), NULL)
 116
 117 /* Return the address of the dtv for the current thread.  */
 118 # define THREAD_DTV() \
 119   (((tcbhead_t *) __thread_self)->dtv)
 120
 121 /* Return the thread descriptor for the current thread.  */
 122 #define THREAD_SELF  __thread_self
 123
 124 /* Magic for libthread_db to know how to do THREAD_SELF.  */
 125 # define DB_THREAD_SELF_INCLUDE <sys/ucontext.h>
 126 # define DB_THREAD_SELF \
 127   REGISTER (32, 32, REG_G7 * 4, 0) REGISTER (64, 64, REG_G7 * 8, 0)
 128
 129 /* Access to data in the thread descriptor is easy.  */
 130 #define THREAD_GETMEM(descr, member) \
 131   descr->member
 132 #define THREAD_GETMEM_NC(descr, member, idx) \
 133   descr->member[idx]
 134 #define THREAD_SETMEM(descr, member, value) \
 135   descr->member = (value)
 136 #define THREAD_SETMEM_NC(descr, member, idx, value) \
 137   descr->member[idx] = (value)
 138
 139 /* Set the stack guard field in TCB head.  */
 140 #define THREAD_SET_STACK_GUARD(value) \
 141   THREAD_SETMEM (THREAD_SELF, header.stack_guard, value)
 142 # define THREAD_COPY_STACK_GUARD(descr) \
 143   ((descr)->header.stack_guard \
 144    = THREAD_GETMEM (THREAD_SELF, header.stack_guard))
 145
 146 /* Get/set the stack guard field in TCB head.  */
 147 #define THREAD_GET_POINTER_GUARD() \
 148   THREAD_GETMEM (THREAD_SELF, header.pointer_guard)
 149 #define THREAD_SET_POINTER_GUARD(value) \
 150   THREAD_SETMEM (THREAD_SELF, header.pointer_guard, value)
 151 # define THREAD_COPY_POINTER_GUARD(descr) \
 152   ((descr)->header.pointer_guard = THREAD_GET_POINTER_GUARD ())
 153
 154 /* Get and set the global scope generation counter in struct pthread.  */
 155 #define THREAD_GSCOPE_FLAG_UNUSED 0
 156 #define THREAD_GSCOPE_FLAG_USED   1
 157 #define THREAD_GSCOPE_FLAG_WAIT   2
 158 #define THREAD_GSCOPE_RESET_FLAG() \
 159   do                                                                         \
 160     { int __res                                                              \
 161         = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag,             \
 162                                THREAD_GSCOPE_FLAG_UNUSED);                   \
 163       if (__res == THREAD_GSCOPE_FLAG_WAIT)                                  \
 164         lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE);   \
 165     }                                                                        \
 166   while (0)
 167 #define THREAD_GSCOPE_SET_FLAG() \
 168   do                                                                         \
 169     {                                                                        \
 170       THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED;             \
 171       atomic_write_barrier ();                                               \
 172     }                                                                        \
 173   while (0)
 174 #define THREAD_GSCOPE_WAIT() \
 175   GL(dl_wait_lookup_done) ()
 176
 177 #endif /* !ASSEMBLER */
 178
 179 #endif  /* tls.h */