summary refs log tree commit diff
path: root/nptl/sysdeps/sh/tls.h
blob: 84e464c448c4295598eed212ba3a055d63dde3c9 (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
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
/* Definition for thread-local data handling.  NPTL/SH 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 <sysdep.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
{
  dtv_t *dtv;
  uintptr_t pointer_guard;
} tcbhead_t;

# define TLS_MULTIPLE_THREADS_IN_TCB 1

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


#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)

/* 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 __alignof__ (struct pthread)

/* The TLS blocks start right after the TCB.  */
# define TLS_DTV_AT_TP	1
# define TLS_TCB_AT_TP	0

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

/* 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.
   The contained asm must *not* be marked volatile since otherwise
   assignments like
	struct pthread *self = thread_self();
   do not get optimized away.  */
# define THREAD_SELF \
  ({ struct pthread *__self;						      \
     __asm ("stc gbr,%0" : "=r" (__self));				      \
     __self - 1;})

/* Magic for libthread_db to know how to do THREAD_SELF.  */
# define DB_THREAD_SELF \
  REGISTER (32, 32, REG_GBR * 4, -sizeof (struct pthread))

/* Read member of the thread descriptor directly.  */
# define THREAD_GETMEM(descr, member) (descr->member)

/* Same as THREAD_GETMEM, but the member offset can be non-constant.  */
# define THREAD_GETMEM_NC(descr, member, idx) (descr->member[idx])

/* Set member of the thread descriptor directly.  */
# define THREAD_SETMEM(descr, member, value) \
    descr->member = (value)

/* Same as THREAD_SETMEM, but the member offset can be non-constant.  */
# define THREAD_SETMEM_NC(descr, member, idx, value) \
    descr->member[idx] = (value)

#define THREAD_GET_POINTER_GUARD() \
  ({ tcbhead_t *__tcbp;							      \
     __asm __volatile ("stc gbr,%0" : "=r" (__tcbp));			      \
     __tcbp->pointer_guard;})
 #define THREAD_SET_POINTER_GUARD(value) \
  ({ tcbhead_t *__tcbp;							      \
     __asm __volatile ("stc gbr,%0" : "=r" (__tcbp));			      \
     __tcbp->pointer_guard = (value);})
#define THREAD_COPY_POINTER_GUARD(descr) \
  ({ tcbhead_t *__tcbp;							      \
     __asm __volatile ("stc gbr,%0" : "=r" (__tcbp));			      \
     ((tcbhead_t *) (descr + 1))->pointer_guard	= __tcbp->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 */