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

/* Definitions for thread-local data handling.  NPTL/sparc version.
   Copyright (C) 2003-2014 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, see
   <http://www.gnu.org/licenses/>.  */

#ifndef _TLS_H
#define _TLS_H

#include <dl-sysdep.h>
#ifndef __ASSEMBLER__
# include <stdbool.h>
# include <stddef.h>
# include <stdint.h>
# include <stdlib.h>
# include <list.h>
# include <kernel-features.h>

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

typedef struct
{
  void *tcb;		/* Pointer to the TCB.  Not necessary the
			   thread descriptor used by libpthread.  */
  dtv_t *dtv;
  void *self;
  int multiple_threads;
#if __WORDSIZE == 64
  int gscope_flag;
#endif
  uintptr_t sysinfo;
  uintptr_t stack_guard;
  uintptr_t pointer_guard;
#if __WORDSIZE != 64
  int gscope_flag;
#endif
#ifndef __ASSUME_PRIVATE_FUTEX
  int private_futex;
#endif
} tcbhead_t;

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


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

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

register struct pthread *__thread_self __asm__("%g7");

/* This is the size of the initial TCB.  Can't be just sizeof (tcbhead_t),
   because NPTL getpid, __libc_alloca_cutoff etc. need (almost) the whole
   struct pthread even when not linked with -lpthread.  */
# define TLS_INIT_TCB_SIZE sizeof (struct pthread)

/* 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 (struct pthread)

/* Alignment requirements for the TCB.  */
# define TLS_TCB_ALIGN __alignof__ (struct pthread)

/* The TCB can have any size and the memory following the address the
   thread pointer points to is unspecified.  Allocate the TCB there.  */
# define TLS_TCB_AT_TP	1

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

/* Install new dtv for current thread.  */
# define INSTALL_NEW_DTV(DTV) \
  (((tcbhead_t *) __thread_self)->dtv = (DTV))

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

/* Code to initially initialize the thread pointer.  */
# define TLS_INIT_TP(descr, secondcall) \
  (__thread_self = (__typeof (__thread_self)) (descr), NULL)

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

/* Return the thread descriptor for the current thread.  */
#define THREAD_SELF  __thread_self

/* Magic for libthread_db to know how to do THREAD_SELF.  */
# define DB_THREAD_SELF \
  REGISTER (32, 32, 10 * 4, 0) \
  REGISTER (64, __WORDSIZE, (6 * 8) + (__WORDSIZE==64?0:4), 0)

/* 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)

/* Set the stack guard field in TCB head.  */
#define THREAD_SET_STACK_GUARD(value) \
  THREAD_SETMEM (THREAD_SELF, header.stack_guard, value)
# define THREAD_COPY_STACK_GUARD(descr) \
  ((descr)->header.stack_guard \
   = THREAD_GETMEM (THREAD_SELF, header.stack_guard))

/* Get/set the stack guard field in TCB head.  */
#define THREAD_GET_POINTER_GUARD() \
  THREAD_GETMEM (THREAD_SELF, header.pointer_guard)
#define THREAD_SET_POINTER_GUARD(value) \
  THREAD_SETMEM (THREAD_SELF, header.pointer_guard, value)
# define THREAD_COPY_POINTER_GUARD(descr) \
  ((descr)->header.pointer_guard = THREAD_GET_POINTER_GUARD ())

/* 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
cd2fbe58	1	/* Definitions for thread-local data handling. NPTL/sparc version.
d4697bc9	2	Copyright (C) 2003-2014 Free Software Foundation, Inc.
cd2fbe58 UD	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
59ba27a6 PE	16	License along with the GNU C Library; if not, see
59ba27a6 PE	17	<http://www.gnu.org/licenses/>. */
cd2fbe58 UD	18
	19	#ifndef _TLS_H
	20	#define _TLS_H
	21
	22	#include <dl-sysdep.h>
	23	#ifndef __ASSEMBLER__
9dcafc55	24	# include <stdbool.h>
cd2fbe58 UD	25	# include <stddef.h>
	26	# include <stdint.h>
	27	# include <stdlib.h>
	28	# include <list.h>
558f0300	29	# include <kernel-features.h>
cd2fbe58 UD	30
	31	/* Type for the dtv. */
	32	typedef union dtv
	33	{
	34	size_t counter;
9dcafc55 UD	35	struct
	36	{
	37	void *val;
	38	bool is_static;
	39	} pointer;
cd2fbe58 UD	40	} dtv_t;
	41
	42	typedef struct
	43	{
	44	void tcb; / Pointer to the TCB. Not necessary the
	45	thread descriptor used by libpthread. */
	46	dtv_t *dtv;
	47	void *self;
	48	int multiple_threads;
ef0af159 JJ	49	#if __WORDSIZE == 64
	50	int gscope_flag;
	51	#endif
35f1e827 UD	52	uintptr_t sysinfo;
35f1e827 UD	53	uintptr_t stack_guard;
305bb37e	54	uintptr_t pointer_guard;
ef0af159 JJ	55	#if __WORDSIZE != 64
	56	int gscope_flag;
	57	#endif
558f0300 JJ	58	#ifndef __ASSUME_PRIVATE_FUTEX
	59	int private_futex;
	60	#endif
cd2fbe58 UD	61	} tcbhead_t;
	62
	63	#else /* __ASSEMBLER__ */
	64	# include <tcb-offsets.h>
	65	#endif /* __ASSEMBLER__ */
	66
cd2fbe58	67
cd2fbe58 UD	68	#ifndef __ASSEMBLER__
	69	/* Get system call information. */
	70	# include <sysdep.h>
	71
	72	/* Get the thread descriptor definition. */
	73	# include <nptl/descr.h>
	74
	75	register struct pthread *__thread_self __asm__("%g7");
	76
f7d78e18 UD	77	/* This is the size of the initial TCB. Can't be just sizeof (tcbhead_t),
	78	because NPTL getpid, __libc_alloca_cutoff etc. need (almost) the whole
	79	struct pthread even when not linked with -lpthread. */
	80	# define TLS_INIT_TCB_SIZE sizeof (struct pthread)
cd2fbe58 UD	81
cd2fbe58 UD	82	/* Alignment requirements for the initial TCB. */
f7d78e18	83	# define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread)
cd2fbe58 UD	84
	85	/* This is the size of the TCB. */
	86	# define TLS_TCB_SIZE sizeof (struct pthread)
	87
	88	/* Alignment requirements for the TCB. */
	89	# define TLS_TCB_ALIGN __alignof__ (struct pthread)
	90
	91	/* The TCB can have any size and the memory following the address the
	92	thread pointer points to is unspecified. Allocate the TCB there. */
	93	# define TLS_TCB_AT_TP 1
	94
	95	/* Install the dtv pointer. The pointer passed is to the element with
	96	index -1 which contain the length. */
	97	# define INSTALL_DTV(descr, dtvp) \
	98	((tcbhead_t *) (descr))->dtv = (dtvp) + 1
	99
	100	/* Install new dtv for current thread. */
	101	# define INSTALL_NEW_DTV(DTV) \
	102	(((tcbhead_t *) __thread_self)->dtv = (DTV))
	103
	104	/* Return dtv of given thread descriptor. */
	105	# define GET_DTV(descr) \
	106	(((tcbhead_t *) (descr))->dtv)
	107
	108	/* Code to initially initialize the thread pointer. */
	109	# define TLS_INIT_TP(descr, secondcall) \
	110	(__thread_self = (__typeof (__thread_self)) (descr), NULL)
	111
	112	/* Return the address of the dtv for the current thread. */
	113	# define THREAD_DTV() \
	114	(((tcbhead_t *) __thread_self)->dtv)
	115
	116	/* Return the thread descriptor for the current thread. */
	117	#define THREAD_SELF __thread_self
	118
7f08f55a	119	/* Magic for libthread_db to know how to do THREAD_SELF. */
7f08f55a	120	# define DB_THREAD_SELF \
f0762164 DM	121	REGISTER (32, 32, 10 * 4, 0) \
f0762164 DM	122	REGISTER (64, __WORDSIZE, (6 * 8) + (__WORDSIZE==64?0:4), 0)
7f08f55a	123
cd2fbe58 UD	124	/* Access to data in the thread descriptor is easy. */
	125	#define THREAD_GETMEM(descr, member) \
	126	descr->member
	127	#define THREAD_GETMEM_NC(descr, member, idx) \
	128	descr->member[idx]
	129	#define THREAD_SETMEM(descr, member, value) \
	130	descr->member = (value)
	131	#define THREAD_SETMEM_NC(descr, member, idx, value) \
	132	descr->member[idx] = (value)
	133
35f1e827 UD	134	/* Set the stack guard field in TCB head. */
	135	#define THREAD_SET_STACK_GUARD(value) \
	136	THREAD_SETMEM (THREAD_SELF, header.stack_guard, value)
	137	# define THREAD_COPY_STACK_GUARD(descr) \
	138	((descr)->header.stack_guard \
	139	= THREAD_GETMEM (THREAD_SELF, header.stack_guard))
	140
305bb37e UD	141	/* Get/set the stack guard field in TCB head. */
	142	#define THREAD_GET_POINTER_GUARD() \
	143	THREAD_GETMEM (THREAD_SELF, header.pointer_guard)
	144	#define THREAD_SET_POINTER_GUARD(value) \
	145	THREAD_SETMEM (THREAD_SELF, header.pointer_guard, value)
	146	# define THREAD_COPY_POINTER_GUARD(descr) \
	147	((descr)->header.pointer_guard = THREAD_GET_POINTER_GUARD ())
	148
991fa82b UD	149	/* Get and set the global scope generation counter in struct pthread. */
	150	#define THREAD_GSCOPE_FLAG_UNUSED 0
	151	#define THREAD_GSCOPE_FLAG_USED 1
	152	#define THREAD_GSCOPE_FLAG_WAIT 2
	153	#define THREAD_GSCOPE_RESET_FLAG() \
	154	do \
	155	{ int __res \
	156	= atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \
	157	THREAD_GSCOPE_FLAG_UNUSED); \
	158	if (__res == THREAD_GSCOPE_FLAG_WAIT) \
085a4412	159	lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \
991fa82b UD	160	} \
	161	while (0)
	162	#define THREAD_GSCOPE_SET_FLAG() \
	163	do \
	164	{ \
	165	THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \
	166	atomic_write_barrier (); \
	167	} \
	168	while (0)
	169	#define THREAD_GSCOPE_WAIT() \
	170	GL(dl_wait_lookup_done) ()
	171
cd2fbe58 UD	172	#endif /* !ASSEMBLER */
	173
	174	#endif /* tls.h */