nptl/sysdeps/sparc/tls.h

   1 /* Definitions for thread-local data handling.  NPTL/sparc version.
   2    Copyright (C) 2003 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 <stddef.h>
  26 # include <stdint.h>
  27 # include <stdlib.h>
  28 # include <list.h>
  29
  30 /* Type for the dtv.  */
  31 typedef union dtv
  32 {
  33   size_t counter;
  34   void *pointer;
  35 } dtv_t;
  36
  37 typedef struct
  38 {
  39   void *tcb;            /* Pointer to the TCB.  Not necessary the
  40                            thread descriptor used by libpthread.  */
  41   dtv_t *dtv;
  42   void *self;
  43   int multiple_threads;
  44 } tcbhead_t;
  45
  46 #else /* __ASSEMBLER__ */
  47 # include <tcb-offsets.h>
  48 #endif /* __ASSEMBLER__ */
  49
  50 /* We require TLS support in the tools.  */
  51 #ifndef HAVE_TLS_SUPPORT
  52 # error "TLS support is required."
  53 #endif
  54
  55 /* Signal that TLS support is available.  */
  56 #define USE_TLS 1
  57
  58 #ifndef __ASSEMBLER__
  59 /* Get system call information.  */
  60 # include <sysdep.h>
  61
  62 /* Get the thread descriptor definition.  */
  63 # include <nptl/descr.h>
  64
  65 register struct pthread *__thread_self __asm__("%g7");
  66
  67 /* This is the size of the initial TCB.  */
  68 # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
  69
  70 /* Alignment requirements for the initial TCB.  */
  71 # define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t)
  72
  73 /* This is the size of the TCB.  */
  74 # define TLS_TCB_SIZE sizeof (struct pthread)
  75
  76 /* Alignment requirements for the TCB.  */
  77 # define TLS_TCB_ALIGN __alignof__ (struct pthread)
  78
  79 /* The TCB can have any size and the memory following the address the
  80    thread pointer points to is unspecified.  Allocate the TCB there.  */
  81 # define TLS_TCB_AT_TP  1
  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(descr, dtvp) \
  86   ((tcbhead_t *) (descr))->dtv = (dtvp) + 1
  87
  88 /* Install new dtv for current thread.  */
  89 # define INSTALL_NEW_DTV(DTV) \
  90   (((tcbhead_t *) __thread_self)->dtv = (DTV))
  91
  92 /* Return dtv of given thread descriptor.  */
  93 # define GET_DTV(descr) \
  94   (((tcbhead_t *) (descr))->dtv)
  95
  96 /* Code to initially initialize the thread pointer.  */
  97 # define TLS_INIT_TP(descr, secondcall) \
  98   (__thread_self = (__typeof (__thread_self)) (descr), NULL)
  99
 100 /* Return the address of the dtv for the current thread.  */
 101 # define THREAD_DTV() \
 102   (((tcbhead_t *) __thread_self)->dtv)
 103
 104 /* Return the thread descriptor for the current thread.  */
 105 #define THREAD_SELF  __thread_self
 106
 107 /* Magic for libthread_db to know how to do THREAD_SELF.  */
 108 # define DB_THREAD_SELF_INCLUDE <sys/ucontext.h>
 109 # define DB_THREAD_SELF \
 110   REGISTER (32, 32, REG_G7 * 4, 0) REGISTER (64, 64, REG_G7 * 8, 0)
 111
 112 /* Access to data in the thread descriptor is easy.  */
 113 #define THREAD_GETMEM(descr, member) \
 114   descr->member
 115 #define THREAD_GETMEM_NC(descr, member, idx) \
 116   descr->member[idx]
 117 #define THREAD_SETMEM(descr, member, value) \
 118   descr->member = (value)
 119 #define THREAD_SETMEM_NC(descr, member, idx, value) \
 120   descr->member[idx] = (value)
 121
 122 #endif /* !ASSEMBLER */
 123
 124 #endif  /* tls.h */