uclibc-ng/libpthread/nptl/sysdeps/microblaze/tls.h

/* Copyright (C) 2005-2016 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public License as
   published by the Free Software Foundation; either version 2.1 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#ifndef _TLS_H
# define _TLS_H 1

#ifndef __ASSEMBLER__

# include <stdbool.h>
# include <stddef.h>
# include <stdint.h>

/* Type for the dtv.  */
typedef union dtv
{
  size_t counter;
  struct
  {
    void *val;
    bool is_static;
  } pointer;
} dtv_t;

#else /* __ASSEMBLER__ */
# include <tcb-offsets.h>
#endif /* __ASSEMBLER__ */

/* We require TLS support in the tools.  */
#define HAVE_TLS_SUPPORT		1
#define HAVE___THREAD   		1
#define HAVE_TLS_MODEL_ATTRIBUTE       	1

/* Signal that TLS support is available.  */
#define USE_TLS 1

#ifndef __ASSEMBLER__

/* Get system call information.  */
# include <sysdep.h>

/* The TP points to the start of the thread blocks.  */
# define TLS_DTV_AT_TP  1

/* Get the thread descriptor definition.  */
# include <../../descr.h>

typedef struct
{
  dtv_t *dtv;
  void *private;
} tcbhead_t;

#define READ_THREAD_POINTER() \
  ({ register void *__microblaze_thread_area __asm__ ("r21"); \
     __microblaze_thread_area; })

/* This is the size of the initial TCB.  */
# define TLS_INIT_TCB_SIZE	sizeof (tcbhead_t)

/* Alignment requirements for the initial TCB.  */
# define TLS_INIT_TCB_ALIGN	16

/* This is the size of the TCB.  */
# define TLS_TCB_SIZE       	sizeof (tcbhead_t)

/* This is the size we need before TCB.  */
# define TLS_PRE_TCB_SIZE   	sizeof (struct pthread)

/* Alignment requirements for the TCB.  */
# define TLS_TCB_ALIGN      	16

/* Install the dtv pointer.  The pointer passed is to the element with
   index -1 which contain the length.  */
# define INSTALL_DTV(tcbp, dtvp) \
  (((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1)

/* Install new dtv for current thread.  */
# define INSTALL_NEW_DTV(dtv) \
  (THREAD_DTV() = (dtv))

/* Return dtv of given thread descriptor.  */
# define GET_DTV(tcbp) \
  (((tcbhead_t *) (tcbp))->dtv)

/* Code to initially initialize the thread pointer.
   r21 is reserved for thread pointer.  */
# define TLS_INIT_TP(tcbp, secondcall) \
  ({ __asm__ __volatile__ ("or r21,r0,%0" : : "r" ((void *)tcbp)); NULL; })

# define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) + 1

/* Return the address of the dtv for the current thread.  */
# define THREAD_DTV() \
  (((tcbhead_t *) READ_THREAD_POINTER())->dtv)

/* Return the thread descriptor for the current thread.  */
# define THREAD_SELF \
  (((struct pthread *) READ_THREAD_POINTER()) - 1)

/* Magic for libthread_db to know how to do THREAD_SELF.  */
# define DB_THREAD_SELF \
  CONST_THREAD_AREA (32, sizeof (struct pthread))

/* Read member of the thread descriptor directly.  */
# define THREAD_GETMEM(descr, member) (descr->member)

/* Same as THREAD_GETMEM, but the member offset can be non-constant.  */
# define THREAD_GETMEM_NC(descr, member, idx) \
  (descr->member[idx])

/* Set member of the thread descriptor directly.  */
# define THREAD_SETMEM(descr, member, value) \
  (descr->member = (value))

/* Same as THREAD_SETMEM, but the member offset can be non-constant.  */
# define THREAD_SETMEM_NC(descr, member, idx, value) \
  (descr->member[idx] = (value))

/* Get and set the global scope generation counter in struct pthread.  */
# define THREAD_GSCOPE_FLAG_UNUSED 0
# define THREAD_GSCOPE_FLAG_USED   1
# define THREAD_GSCOPE_FLAG_WAIT   2
# define THREAD_GSCOPE_RESET_FLAG()                                         \
  do                                                                        \
    { int __res                                                             \
      = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag,              \
                             THREAD_GSCOPE_FLAG_UNUSED);                    \
      if (__res == THREAD_GSCOPE_FLAG_WAIT)                                 \
        lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE);  \
    }                                                                       \
  while (0)
# define THREAD_GSCOPE_SET_FLAG()                                           \
  do                                                                        \
    {                                                                       \
      THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED;            \
      atomic_write_barrier ();                                              \
    }                                                                       \
  while (0)
# define THREAD_GSCOPE_WAIT() \
  GL (dl_wait_lookup_done) ()

#endif /* __ASSEMBLER__ */

#endif /* tls.h.  */