[thirdparty/glibc.git] / sysdeps / arm / nptl / tls.h

/* Definition for thread-local data handling.  NPTL/ARM version.
   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 _ARM_NPTL_TLS_H
#define _ARM_NPTL_TLS_H	1

#include <dl-sysdep.h>

#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__ */


#ifndef __ASSEMBLER__

/* 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	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)

# 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 (32, 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_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 */
Commit	Line	Data
02a9f771	1	/* Definition for thread-local data handling. NPTL/ARM version.
f7a9f785	2	Copyright (C) 2005-2016 Free Software Foundation, Inc.
02a9f771 DJ	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
ab84e3ff PE	16	License along with the GNU C Library. If not, see
ab84e3ff PE	17	<http://www.gnu.org/licenses/>. */
02a9f771	18
46f1d8a6 RM	19	#ifndef _ARM_NPTL_TLS_H
46f1d8a6 RM	20	#define _ARM_NPTL_TLS_H 1
02a9f771 DJ	21
	22	#include <dl-sysdep.h>
	23
	24	#ifndef __ASSEMBLER__
	25	# include <stdbool.h>
	26	# include <stddef.h>
	27	# include <stdint.h>
	28
	29	/* Type for the dtv. */
	30	typedef union dtv
	31	{
	32	size_t counter;
	33	struct
	34	{
	35	void *val;
	36	bool is_static;
	37	} pointer;
	38	} dtv_t;
	39
	40	#else /* __ASSEMBLER__ */
	41	# include <tcb-offsets.h>
	42	#endif /* __ASSEMBLER__ */
	43
	44
02a9f771 DJ	45	#ifndef __ASSEMBLER__
02a9f771 DJ	46
02a9f771 DJ	47	/* The TP points to the start of the thread blocks. */
02a9f771 DJ	48	# define TLS_DTV_AT_TP 1
498a2233	49	# define TLS_TCB_AT_TP 0
02a9f771 DJ	50
	51	/* Get the thread descriptor definition. */
	52	# include <nptl/descr.h>
	53
	54	typedef struct
	55	{
	56	dtv_t *dtv;
	57	void *private;
	58	} tcbhead_t;
	59
	60	/* This is the size of the initial TCB. */
	61	# define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
	62
	63	/* Alignment requirements for the initial TCB. */
	64	# define TLS_INIT_TCB_ALIGN 16
	65
	66	/* This is the size of the TCB. */
	67	# define TLS_TCB_SIZE sizeof (tcbhead_t)
	68
	69	/* This is the size we need before TCB. */
	70	# define TLS_PRE_TCB_SIZE sizeof (struct pthread)
	71
	72	/* Alignment requirements for the TCB. */
	73	# define TLS_TCB_ALIGN 16
	74
	75	/* Install the dtv pointer. The pointer passed is to the element with
	76	index -1 which contain the length. */
	77	# define INSTALL_DTV(tcbp, dtvp) \
	78	(((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1)
	79
	80	/* Install new dtv for current thread. */
	81	# define INSTALL_NEW_DTV(dtv) \
	82	(THREAD_DTV() = (dtv))
	83
	84	/* Return dtv of given thread descriptor. */
	85	# define GET_DTV(tcbp) \
	86	(((tcbhead_t *) (tcbp))->dtv)
	87
08f41f04 RM	88	# define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) + 1
08f41f04 RM	89
02a9f771 DJ	90	/* Return the address of the dtv for the current thread. */
	91	# define THREAD_DTV() \
	92	(((tcbhead_t *) __builtin_thread_pointer ())->dtv)
	93
	94	/* Return the thread descriptor for the current thread. */
	95	# define THREAD_SELF \
	96	((struct pthread *)__builtin_thread_pointer () - 1)
	97
	98	/* Magic for libthread_db to know how to do THREAD_SELF. */
	99	# define DB_THREAD_SELF \
	100	CONST_THREAD_AREA (32, sizeof (struct pthread))
	101
	102	/* Access to data in the thread descriptor is easy. */
	103	#define THREAD_GETMEM(descr, member) \
	104	descr->member
	105	#define THREAD_GETMEM_NC(descr, member, idx) \
	106	descr->member[idx]
	107	#define THREAD_SETMEM(descr, member, value) \
	108	descr->member = (value)
	109	#define THREAD_SETMEM_NC(descr, member, idx, value) \
	110	descr->member[idx] = (value)
	111
30efab51 DJ	112	/* Get and set the global scope generation counter in struct pthread. */
	113	#define THREAD_GSCOPE_FLAG_UNUSED 0
	114	#define THREAD_GSCOPE_FLAG_USED 1
	115	#define THREAD_GSCOPE_FLAG_WAIT 2
	116	#define THREAD_GSCOPE_RESET_FLAG() \
	117	do \
	118	{ int __res \
	119	= atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \
	120	THREAD_GSCOPE_FLAG_UNUSED); \
	121	if (__res == THREAD_GSCOPE_FLAG_WAIT) \
713ddf8d	122	lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \
30efab51 DJ	123	} \
	124	while (0)
	125	#define THREAD_GSCOPE_SET_FLAG() \
	126	do \
	127	{ \
	128	THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \
	129	atomic_write_barrier (); \
	130	} \
	131	while (0)
	132	#define THREAD_GSCOPE_WAIT() \
	133	GL(dl_wait_lookup_done) ()
	134
02a9f771 DJ	135	#endif /* __ASSEMBLER__ */
	136
	137	#endif /* tls.h */