akaros/tools/compilers/gcc-glibc/glibc-2.19-akaros/sysdeps/akaros/sparc/sparc32/tls.h
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   1/* Definitions for thread-local data handling.  
   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 <kernel-features.h>
  30
  31/* Type for the dtv.  */
  32typedef union dtv
  33{
  34  size_t counter;
  35  struct
  36  {
  37    void *val;
  38    bool is_static;
  39  } pointer;
  40} dtv_t;
  41
  42typedef struct
  43{
  44  void *tcb;            /* Pointer to the TCB.  Not necessary the
  45                           thread descriptor used by librthread.  */
  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
  63typedef struct rthread {
  64        tcbhead_t header;
  65} rthread_t;
  66
  67#else /* __ASSEMBLER__ */
  68//# include <tcb-offsets.h>
  69#endif /* __ASSEMBLER__ */
  70
  71/* We require TLS support in the tools.  */
  72#ifndef HAVE_TLS_SUPPORT
  73# error "TLS support is required."
  74#endif
  75
  76#ifndef __ASSEMBLER__
  77/* Get system call information.  */
  78# include <sysdep.h>
  79
  80register rthread_t *__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 rthread even when not linked with -lrthread.  */
  85# define TLS_INIT_TCB_SIZE sizeof (struct rthread)
  86
  87/* Alignment requirements for the initial TCB.  */
  88# define TLS_INIT_TCB_ALIGN __alignof__ (struct rthread)
  89
  90/* This is the size of the TCB.  */
  91# define TLS_TCB_SIZE sizeof (struct rthread)
  92
  93/* Alignment requirements for the TCB.  */
  94# define TLS_TCB_ALIGN __alignof__ (struct rthread)
  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 rthread.  */
 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 */
 180