summary refs log tree commit diff
path: root/linuxthreads/sysdeps/sh/tls.h
blob: 699eeb62278fd28f0a7fa91fda80aa92d6637cc6 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
/* Definition for thread-local data handling.  linuxthreads/SH version.
   Copyright (C) 2002, 2003, 2005 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

# include <dl-sysdep.h>
# include <pt-machine.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__ */


/* We can support TLS only if the floating-stack support is available.  */
#if defined HAVE_TLS_SUPPORT \
    && (defined FLOATING_STACKS || !defined IS_IN_libpthread)

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

# ifndef __ASSEMBLER__

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 __alignof__ (tcbhead_t)

/* 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_descr_struct)

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

/* The TLS blocks start right after 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) \
  ({ tcbhead_t *__tcbp;							      \
     __asm __volatile ("stc gbr,%0" : "=r" (__tcbp));			      \
     __tcbp->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) \
  ({ __asm __volatile ("ldc %0,gbr" : : "r" (tcbp)); 0; })

/* Return the address of the dtv for the current thread.  */
#  define THREAD_DTV() \
  ({ tcbhead_t *__tcbp;							      \
     __asm __volatile ("stc gbr,%0" : "=r" (__tcbp));			      \
     __tcbp->dtv;})

/* Return the thread descriptor for the current thread.  */
#  undef THREAD_SELF
#  define THREAD_SELF \
  ({ struct _pthread_descr_struct *__self;				      \
     __asm ("stc gbr,%0" : "=r" (__self));				      \
     __self - 1;})

#  undef INIT_THREAD_SELF
#  define INIT_THREAD_SELF(descr, nr) \
  ({ struct _pthread_descr_struct *__self = (void *) descr;		      \
     __asm __volatile ("ldc %0,gbr" : : "r" (__self + 1));		      \
     0; })

# define TLS_MULTIPLE_THREADS_IN_TCB 1

/* Get the thread descriptor definition.  This must be after the
   the definition of THREAD_SELF for TLS.  */
#  include <linuxthreads/descr.h>

# endif /* __ASSEMBLER__ */

#else

# ifndef __ASSEMBLER__

typedef struct
{
  void *tcb;
  dtv_t *dtv;
  void *self;
  int multiple_threads;
} tcbhead_t;

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

#  define NONTLS_INIT_TP \
  do { 									\
    static const tcbhead_t nontls_init_tp = { .multiple_threads = 0 };	\
    __asm __volatile ("ldc %0,gbr" : : "r" (&nontls_init_tp));	        \
  } while (0)

# endif /* __ASSEMBLER__ */

#endif	/* HAVE_TLS_SUPPORT && (FLOATING_STACKS || !IS_IN_libpthread) */

#endif	/* tls.h */