[thirdparty/glibc.git] / linuxthreads / sysdeps / powerpc / powerpc64 / tls.h

/* Definitions for thread-local data handling.  linuxthreads/PowerPC64 version.
   Copyright (C) 2003 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 _TLS_H
#define _TLS_H

#ifndef __ASSEMBLER__

# include <pt-machine.h>
# include <stddef.h>

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


typedef struct
{
  dtv_t *dtv;

  /* Reserved for the thread implementation.  Unused in LinuxThreads.  */
  void *private;
} tcbhead_t;
#endif


#ifdef HAVE_TLS_SUPPORT

/* Signal that TLS support is available.  */
# define USE_TLS	1

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

/* 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__ (tcbhead_t)

/* This is the size of the TCB.  */
#  define TLS_TCB_SIZE		sizeof (tcbhead_t)

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

/* This is the size we need before TCB.  */
#  define TLS_PRE_TCB_SIZE	sizeof (struct _pthread_descr_struct)

/* the following assumes that TP (R13) is points to the end of the tcb
   + 0x7000 (per the ABI).  This implies that tcb address is
   R13-(TLS_TCB_SIZE + 0x7000).  As we define TLS_DTV_AT_TP we can
   assume that the pthread_descr is allocate immediately ahead of the
   tcb.  This implies that the pthread_descr address is
   R13-(TLS_PRE_TCB_SIZE + TLS_TCB_SIZE + 0x7000).  */
#  define TLS_TCB_OFFSET 0x7000

/* The DTV is allocated at the TP; the TCB is placed elsewhere.  */
/* This is not really true for powerpc64.  We are following alpha
   where the DTV pointer is first doubleword in the TCB.  */
#  define TLS_DTV_AT_TP 1

/* 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, SECONDCALL) \
    (__thread_self = (uintptr_t) (TCBP) + TLS_TCB_OFFSET + TLS_TCB_SIZE, 0)

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

/* Return the thread descriptor for the current thread.  */
#  undef THREAD_SELF
#  define THREAD_SELF \
    ((pthread_descr) (__thread_register \
    - (TLS_TCB_OFFSET + TLS_TCB_SIZE + TLS_PRE_TCB_SIZE)))

#  undef INIT_THREAD_SELF
#  define INIT_THREAD_SELF(DESCR, NR) \
    (__thread_self = (pthread_descr) (((char *)(DESCR)) \
    + (TLS_TCB_OFFSET + TLS_TCB_SIZE + TLS_PRE_TCB_SIZE)))

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

/* Generic bits of LinuxThreads may call these macros with
   DESCR set to NULL.  We are expected to be able to reference
   the "current" value.  */

#define THREAD_GETMEM(descr, member) \
  ((void) sizeof (descr), THREAD_SELF->member)
#define THREAD_GETMEM_NC(descr, member) \
  ((void) sizeof (descr), THREAD_SELF->member)
#define THREAD_SETMEM(descr, member, value) \
  ((void) sizeof (descr), THREAD_SELF->member = (value))
#define THREAD_SETMEM_NC(descr, member, value) \
  ((void) sizeof (descr), THREAD_SELF->member = (value))

# endif	/* HAVE_TLS_SUPPORT */
#endif /* __ASSEMBLER__ */

#endif	/* tls.h */
Commit	Line	Data
1d02f71f RM	1	/* Definitions for thread-local data handling. linuxthreads/PowerPC64 version.
	2	Copyright (C) 2003 Free Software Foundation, Inc.
	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
	16	License along with the GNU C Library; if not, write to the Free
	17	Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
	18	02111-1307 USA. */
	19
	20	#ifndef _TLS_H
	21	#define _TLS_H
	22
	23	#ifndef __ASSEMBLER__
	24
	25	# include <pt-machine.h>
	26	# include <stddef.h>
	27
	28	/* Type for the dtv. */
	29	typedef union dtv
	30	{
	31	size_t counter;
	32	void *pointer;
	33	} dtv_t;
	34
	35
	36	typedef struct
	37	{
	38	dtv_t *dtv;
	39
	40	/* Reserved for the thread implementation. Unused in LinuxThreads. */
	41	void *private;
	42	} tcbhead_t;
	43	#endif
	44
	45
	46	#ifdef HAVE_TLS_SUPPORT
	47
	48	/* Signal that TLS support is available. */
	49	# define USE_TLS 1
	50
	51	# ifndef __ASSEMBLER__
	52	/* Get system call information. */
	53	# include <sysdep.h>
	54
	55	/* This is the size of the initial TCB. */
	56	# define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
	57
	58	/* Alignment requirements for the initial TCB. */
	59	# define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t)
	60
	61	/* This is the size of the TCB. */
	62	# define TLS_TCB_SIZE sizeof (tcbhead_t)
	63
	64	/* Alignment requirements for the TCB. */
65	# define TLS_TCB_ALIGN __alignof__ (tcbhead_t)
66
67	/* This is the size we need before TCB. */
68	# define TLS_PRE_TCB_SIZE sizeof (struct _pthread_descr_struct)
69
70	/* the following assumes that TP (R13) is points to the end of the tcb
71	+ 0x7000 (per the ABI). This implies that tcb address is
72	R13-(TLS_TCB_SIZE + 0x7000). As we define TLS_DTV_AT_TP we can
73	assume that the pthread_descr is allocate immediately ahead of the
74	tcb. This implies that the pthread_descr address is
75	R13-(TLS_PRE_TCB_SIZE + TLS_TCB_SIZE + 0x7000). */
76	# define TLS_TCB_OFFSET 0x7000
77
78	/* The DTV is allocated at the TP; the TCB is placed elsewhere. */
79	/* This is not really true for powerpc64. We are following alpha
80	where the DTV pointer is first doubleword in the TCB. */
81	# define TLS_DTV_AT_TP 1
82
83	/* Install the dtv pointer. The pointer passed is to the element with
84	index -1 which contain the length. */
85	# define INSTALL_DTV(TCBP, DTVP) \
86	(((tcbhead_t *) (TCBP))->dtv = (DTVP) + 1)
87
88	/* Install new dtv for current thread. */
89	# define INSTALL_NEW_DTV(DTV) (THREAD_DTV() = (DTV))
90
91	/* Return dtv of given thread descriptor. */
92	# define GET_DTV(TCBP) (((tcbhead_t *) (TCBP))->dtv)
93
94	/* Code to initially initialize the thread pointer. This might need
95	special attention since 'errno' is not yet available and if the
96	operation can cause a failure 'errno' must not be touched. */
97	# define TLS_INIT_TP(TCBP, SECONDCALL) \
98	(__thread_self = (uintptr_t) (TCBP) + TLS_TCB_OFFSET + TLS_TCB_SIZE, 0)
99
100	/* Return the address of the dtv for the current thread. */
101	# define THREAD_DTV() \
102	(((tcbhead_t *) (__thread_register - (TLS_TCB_OFFSET + TLS_TCB_SIZE)))->dtv)
103
104	/* Return the thread descriptor for the current thread. */
105	# undef THREAD_SELF
106	# define THREAD_SELF \
107	((pthread_descr) (__thread_register \
108	- (TLS_TCB_OFFSET + TLS_TCB_SIZE + TLS_PRE_TCB_SIZE)))
109
110	# undef INIT_THREAD_SELF
111	# define INIT_THREAD_SELF(DESCR, NR) \
112	(__thread_self = (pthread_descr) (((char *)(DESCR)) \
113	+ (TLS_TCB_OFFSET + TLS_TCB_SIZE + TLS_PRE_TCB_SIZE)))
114
115	/* Get the thread descriptor definition. */
116	# include <linuxthreads/descr.h>
117
118	/* Generic bits of LinuxThreads may call these macros with
119	DESCR set to NULL. We are expected to be able to reference
120	the "current" value. */
121
122	#define THREAD_GETMEM(descr, member) \
123	((void) sizeof (descr), THREAD_SELF->member)
124	#define THREAD_GETMEM_NC(descr, member) \
125	((void) sizeof (descr), THREAD_SELF->member)
126	#define THREAD_SETMEM(descr, member, value) \
127	((void) sizeof (descr), THREAD_SELF->member = (value))
128	#define THREAD_SETMEM_NC(descr, member, value) \
129	((void) sizeof (descr), THREAD_SELF->member = (value))
130
131	# endif /* HAVE_TLS_SUPPORT */
132	#endif /* __ASSEMBLER__ */
133
134	#endif /* tls.h */