/* Copyright (C) 2005-2018 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

#include <dl-sysdep.h>

#ifndef __ASSEMBLER__

# include <stdbool.h>

# include <stddef.h>

# include <stdint.h>

# include <dl-dtv.h>

#else /* __ASSEMBLER__ */

# include <tcb-offsets.h>

#endif /* __ASSEMBLER__ */

#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

# define TLS_TCB_AT_TP	0

/* Get the thread descriptor definition.  */

# include <nptl/descr.h>

typedef struct

{

  dtv_t *dtv;

  void *private;

} tcbhead_t;

/* 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	__alignof__ (struct pthread)

/* 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		__alignof__ (struct pthread)

/* 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.  This might need

   special attention since 'errno' is not yet available and if the

   operation can cause a failure 'errno' must not be touched.  */

# define TLS_INIT_TP(tcbp) \

  ({ __asm __volatile ("msr tpidr_el0, %0" : : "r" (tcbp)); NULL; })

/* Value passed to 'clone' for initialization of the thread register.  */

# 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 *) __builtin_thread_pointer ())->dtv)

/* Return the thread descriptor for the current thread.  */

# define THREAD_SELF \

 ((struct pthread *)__builtin_thread_pointer () - 1)

/* Magic for libthread_db to know how to do THREAD_SELF.  */

# define DB_THREAD_SELF \

  CONST_THREAD_AREA (64, sizeof (struct pthread))

/* Access to data in the thread descriptor is easy.  */

# define THREAD_GETMEM(descr, member) \

  descr->member

# define THREAD_GETMEM_NC(descr, member, idx) \

  descr->member[idx]

# define THREAD_SETMEM(descr, member, value) \

  descr->member = (value)

# 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_IN_TCB      1

# 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 */