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/* Definition for thread-local data handling.  NPTL/RISC-V version.

   Copyright (C) 2011-2014 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, write to the Free

   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

   02111-1307 USA.  */

#ifndef _RISCV_TLS_H

#define _RISCV_TLS_H    1

#include <dl-sysdep.h>

/* Signal that TLS support is available.  */

#define USE_TLS 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;

register void* __thread_self asm("tp");

# define READ_THREAD_POINTER() ({ __thread_self; })

/* 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.  Because our TCB is before the thread

   pointer, we don't need this.  */

# define TLS_INIT_TCB_SIZE      0

/* Alignment requirements for the initial TCB.  */

# define TLS_INIT_TCB_ALIGN     __alignof__ (struct pthread)

/* This is the size of the TCB.  Because our TCB is before the thread

   pointer, we don't need this.  */

# define TLS_TCB_SIZE           0

/* Alignment requirements for the TCB.  */

# define TLS_TCB_ALIGN          __alignof__ (struct pthread)

/* This is the size we need before TCB - actually, it includes the TCB.  */

# define TLS_PRE_TCB_SIZE \

  (sizeof (struct pthread)                                                    \

   + ((sizeof (tcbhead_t) + TLS_TCB_ALIGN - 1) & ~(TLS_TCB_ALIGN - 1)))

/* The thread pointer tp points to the end of the TCB.

   The pthread_descr structure is immediately in front of the TCB. */

# define TLS_TCB_OFFSET 0

/* 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))[-1].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))[-1].dtv)

/* Code to initially initialize the thread pointer. */

# define TLS_INIT_TP(tcbp) \

  ({ __thread_self = (char*)tcbp + TLS_TCB_OFFSET; NULL; })

/* Return the address of the dtv for the current thread.  */

# define THREAD_DTV() \

  (((tcbhead_t *) (READ_THREAD_POINTER () - TLS_TCB_OFFSET))[-1].dtv)

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

# define THREAD_SELF \

 ((struct pthread *) (READ_THREAD_POINTER ()                         \

                      - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE))

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

# define TLS_DEFINE_INIT_TP(tp, pd) \

  void *tp = (void *) (pd) + TLS_TCB_OFFSET + TLS_PRE_TCB_SIZE

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

# define DB_THREAD_SELF \

  CONST_THREAD_AREA (32, TLS_TCB_OFFSET + TLS_PRE_TCB_SIZE)

/* 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)

/* l_tls_offset == 0 is perfectly valid, so we have to use some different

   value to mean unset l_tls_offset.  */

# define NO_TLS_OFFSET          -1

/* 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 */