nptl/sysdeps/sparc/tls.h

   1 /* Definitions for thread-local data handling.  NPTL/sparc version.
   2    Copyright (C) 2003, 2005 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
  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 } tcbhead_t;
  50
  51 #else /* __ASSEMBLER__ */
  52 # include <tcb-offsets.h>
  53 #endif /* __ASSEMBLER__ */
  54
  55 /* We require TLS support in the tools.  */
  56 #ifndef HAVE_TLS_SUPPORT
  57 # error "TLS support is required."
  58 #endif
  59
  60 /* Signal that TLS support is available.  */
  61 #define USE_TLS 1
  62
  63 #ifndef __ASSEMBLER__
  64 /* Get system call information.  */
  65 # include <sysdep.h>
  66
  67 /* Get the thread descriptor definition.  */
  68 # include <nptl/descr.h>
  69
  70 register struct pthread *__thread_self __asm__("%g7");
  71
  72 /* This is the size of the initial TCB.  Can't be just sizeof (tcbhead_t),
  73    because NPTL getpid, __libc_alloca_cutoff etc. need (almost) the whole
  74    struct pthread even when not linked with -lpthread.  */
  75 # define TLS_INIT_TCB_SIZE sizeof (struct pthread)
  76
  77 /* Alignment requirements for the initial TCB.  */
  78 # define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread)
  79
  80 /* This is the size of the TCB.  */
  81 # define TLS_TCB_SIZE sizeof (struct pthread)
  82
  83 /* Alignment requirements for the TCB.  */
  84 # define TLS_TCB_ALIGN __alignof__ (struct pthread)
  85
  86 /* The TCB can have any size and the memory following the address the
  87    thread pointer points to is unspecified.  Allocate the TCB there.  */
  88 # define TLS_TCB_AT_TP  1
  89
  90 /* Install the dtv pointer.  The pointer passed is to the element with
  91    index -1 which contain the length.  */
  92 # define INSTALL_DTV(descr, dtvp) \
  93   ((tcbhead_t *) (descr))->dtv = (dtvp) + 1
  94
  95 /* Install new dtv for current thread.  */
  96 # define INSTALL_NEW_DTV(DTV) \
  97   (((tcbhead_t *) __thread_self)->dtv = (DTV))
  98
  99 /* Return dtv of given thread descriptor.  */
 100 # define GET_DTV(descr) \
 101   (((tcbhead_t *) (descr))->dtv)
 102
 103 /* Code to initially initialize the thread pointer.  */
 104 # define TLS_INIT_TP(descr, secondcall) \
 105   (__thread_self = (__typeof (__thread_self)) (descr), NULL)
 106
 107 /* Return the address of the dtv for the current thread.  */
 108 # define THREAD_DTV() \
 109   (((tcbhead_t *) __thread_self)->dtv)
 110
 111 /* Return the thread descriptor for the current thread.  */
 112 #define THREAD_SELF  __thread_self
 113
 114 /* Magic for libthread_db to know how to do THREAD_SELF.  */
 115 # define DB_THREAD_SELF_INCLUDE <sys/ucontext.h>
 116 # define DB_THREAD_SELF \
 117   REGISTER (32, 32, REG_G7 * 4, 0) REGISTER (64, 64, REG_G7 * 8, 0)
 118
 119 /* Access to data in the thread descriptor is easy.  */
 120 #define THREAD_GETMEM(descr, member) \
 121   descr->member
 122 #define THREAD_GETMEM_NC(descr, member, idx) \
 123   descr->member[idx]
 124 #define THREAD_SETMEM(descr, member, value) \
 125   descr->member = (value)
 126 #define THREAD_SETMEM_NC(descr, member, idx, value) \
 127   descr->member[idx] = (value)
 128
 129 #endif /* !ASSEMBLER */
 130
 131 #endif  /* tls.h */