[thirdparty/glibc.git] / sysdeps / m68k / nptl / tls.h

/* Definition for thread-local data handling.  NPTL/m68k version.
   Copyright (C) 2010 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Maxim Kuvyrkov <maxim@codesourcery.com>, 2010.

   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 _TLS_H
#define _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__ */

/* 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 <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 + 0x7000, as for PowerPC and MIPS.  This implies that TCB address is
   TP - 0x7000.  As we define TLS_DTV_AT_TP we can
   assume that the pthread struct is allocated immediately ahead of the
   TCB.  This implies that the pthread_descr address is
   TP - (TLS_PRE_TCB_SIZE + 0x7000).  */
# define TLS_TCB_OFFSET	0x7000

/* 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.  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, secondcall)					\
  ({									\
    INTERNAL_SYSCALL_DECL (err);					\
    int _sys_result;							\
									\
    _sys_result = INTERNAL_SYSCALL (set_thread_area, err, 1,		\
				    ((void *) (tcbp)) + TLS_TCB_OFFSET); \
    INTERNAL_SYSCALL_ERROR_P (_sys_result, err) ? "unknown error" : NULL; })

extern void * __m68k_read_tp (void);

/* Return the address of the dtv for the current thread.  */
# define THREAD_DTV() \
  (((tcbhead_t *) (__m68k_read_tp () - TLS_TCB_OFFSET))[-1].dtv)

/* Return the thread descriptor for the current thread.  */
# define THREAD_SELF \
  ((struct pthread *) (__m68k_read_tp () - 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 on M68K, 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 */
Commit	Line	Data
40111cb9 MK	1	/* Definition for thread-local data handling. NPTL/m68k version.
	2	Copyright (C) 2010 Free Software Foundation, Inc.
	3	This file is part of the GNU C Library.
	4	Contributed by Maxim Kuvyrkov <maxim@codesourcery.com>, 2010.
	5
	6	The GNU C Library is free software; you can redistribute it and/or
	7	modify it under the terms of the GNU Lesser General Public
	8	License as published by the Free Software Foundation; either
	9	version 2.1 of the License, or (at your option) any later version.
	10
	11	The GNU C Library is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	Lesser General Public License for more details.
	15
	16	You should have received a copy of the GNU Lesser General Public
	17	License along with the GNU C Library; if not, write to the Free
	18	Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
	19	02111-1307 USA. */
	20
	21	#ifndef _TLS_H
	22	#define _TLS_H 1
	23
	24	#include <dl-sysdep.h>
	25
	26	#ifndef __ASSEMBLER__
	27	# include <stdbool.h>
	28	# include <stddef.h>
	29	# include <stdint.h>
	30
	31	/* Type for the dtv. */
	32	typedef union dtv
	33	{
	34	size_t counter;
	35	struct
	36	{
	37	void *val;
	38	bool is_static;
	39	} pointer;
	40	} dtv_t;
	41
	42	#else /* __ASSEMBLER__ */
	43	# include <tcb-offsets.h>
	44	#endif /* __ASSEMBLER__ */
	45
	46	/* Signal that TLS support is available. */
	47	#define USE_TLS 1
	48
	49	#ifndef __ASSEMBLER__
	50
	51	/* Get system call information. */
	52	# include <sysdep.h>
	53
	54	/* The TP points to the start of the thread blocks. */
	55	# define TLS_DTV_AT_TP 1
	56
	57	/* Get the thread descriptor definition. */
	58	# include <nptl/descr.h>
	59
	60	typedef struct
	61	{
	62	dtv_t *dtv;
	63	void *private;
	64	} tcbhead_t;
65
66	/* This is the size of the initial TCB. Because our TCB is before the thread
67	pointer, we don't need this. */
68	# define TLS_INIT_TCB_SIZE 0
69
70	/* Alignment requirements for the initial TCB. */
71	# define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread)
72
73	/* This is the size of the TCB. Because our TCB is before the thread
74	pointer, we don't need this. */
75	# define TLS_TCB_SIZE 0
76
77	/* Alignment requirements for the TCB. */
78	# define TLS_TCB_ALIGN __alignof__ (struct pthread)
79
80	/* This is the size we need before TCB - actually, it includes the TCB. */
81	# define TLS_PRE_TCB_SIZE \
82	(sizeof (struct pthread) \
83	+ ((sizeof (tcbhead_t) + TLS_TCB_ALIGN - 1) & ~(TLS_TCB_ALIGN - 1)))
84
85	/* The thread pointer (TP) points to the end of the
86	TCB + 0x7000, as for PowerPC and MIPS. This implies that TCB address is
87	TP - 0x7000. As we define TLS_DTV_AT_TP we can
88	assume that the pthread struct is allocated immediately ahead of the
89	TCB. This implies that the pthread_descr address is
90	TP - (TLS_PRE_TCB_SIZE + 0x7000). */
91	# define TLS_TCB_OFFSET 0x7000
92
93	/* Install the dtv pointer. The pointer passed is to the element with
94	index -1 which contain the length. */
95	# define INSTALL_DTV(tcbp, dtvp) \
96	((tcbhead_t *) (tcbp))[-1].dtv = dtvp + 1
97
98	/* Install new dtv for current thread. */
99	# define INSTALL_NEW_DTV(dtv) \
100	(THREAD_DTV () = (dtv))
101
102	/* Return dtv of given thread descriptor. */
103	# define GET_DTV(tcbp) \
104	(((tcbhead_t *) (tcbp))[-1].dtv)
105
106	/* Code to initially initialize the thread pointer. This might need
107	special attention since 'errno' is not yet available and if the
108	operation can cause a failure 'errno' must not be touched. */
109	# define TLS_INIT_TP(tcbp, secondcall) \
110	({ \
111	INTERNAL_SYSCALL_DECL (err); \
112	int _sys_result; \
113	\
114	_sys_result = INTERNAL_SYSCALL (set_thread_area, err, 1, \
115	((void *) (tcbp)) + TLS_TCB_OFFSET); \
116	INTERNAL_SYSCALL_ERROR_P (_sys_result, err) ? "unknown error" : NULL; })
117
118	extern void * __m68k_read_tp (void);
119
120	/* Return the address of the dtv for the current thread. */
121	# define THREAD_DTV() \
122	(((tcbhead_t *) (__m68k_read_tp () - TLS_TCB_OFFSET))[-1].dtv)
123
124	/* Return the thread descriptor for the current thread. */
125	# define THREAD_SELF \
126	((struct pthread *) (__m68k_read_tp () - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE))
127
128	/* Magic for libthread_db to know how to do THREAD_SELF. */
129	# define DB_THREAD_SELF \
130	CONST_THREAD_AREA (32, TLS_TCB_OFFSET + TLS_PRE_TCB_SIZE)
131
132	/* Access to data in the thread descriptor is easy. */
133	# define THREAD_GETMEM(descr, member) \
134	descr->member
135	# define THREAD_GETMEM_NC(descr, member, idx) \
136	descr->member[idx]
137	# define THREAD_SETMEM(descr, member, value) \
138	descr->member = (value)
139	# define THREAD_SETMEM_NC(descr, member, idx, value) \
140	descr->member[idx] = (value)
141
142	/* l_tls_offset == 0 is perfectly valid on M68K, so we have to use some
143	different value to mean unset l_tls_offset. */
144	# define NO_TLS_OFFSET -1
145
146	/* Get and set the global scope generation counter in struct pthread. */
147	#define THREAD_GSCOPE_FLAG_UNUSED 0
148	#define THREAD_GSCOPE_FLAG_USED 1
149	#define THREAD_GSCOPE_FLAG_WAIT 2
150	#define THREAD_GSCOPE_RESET_FLAG() \
151	do \
152	{ int __res \
153	= atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \
154	THREAD_GSCOPE_FLAG_UNUSED); \
155	if (__res == THREAD_GSCOPE_FLAG_WAIT) \
156	lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \
157	} \
158	while (0)
159	#define THREAD_GSCOPE_SET_FLAG() \
160	do \
161	{ \
162	THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \
163	atomic_write_barrier (); \
164	} \
165	while (0)
166	#define THREAD_GSCOPE_WAIT() \
167	GL(dl_wait_lookup_done) ()
168
169	#endif /* __ASSEMBLER__ */
170
171	#endif /* tls.h */