about summary refs log tree commit diff
path: root/sysdeps/csky/nptl/tls.h
blob: 7a234041ed0bff393019af9cc9b3bd537bba79f0 (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
/* Definitions for thread-local data handling.  NPTL/C-SKY version.
   Copyright (C) 2018-2021 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
   <https://www.gnu.org/licenses/>.  */

#ifndef _TLS_H
#define _TLS_H 1

#ifndef __ASSEMBLER__

# include <stdbool.h>
# include <stddef.h>
# include <stdint.h>
# include <dl-dtv.h>

/* Define r31 as thread pointer register.  */
# define READ_THREAD_POINTER() \
  ({ void *__result;						\
     __asm__ __volatile__ ("mov %0, r31"			\
                           : "=r" (__result));			\
     __result; })

#else
# include <tcb-offsets.h>
/* Define r31 as thread pointer register.  */
# define READ_THREAD_POINTER() \
	mov r0, r31;
#endif /* __ASSEMBLER__ */

#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
# define TLS_TCB_AT_TP	0

/* 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.  */
# define TLS_INIT_TCB_SIZE	sizeof (tcbhead_t)

/* Alignment requirements for the initial TCB.  */
# define TLS_INIT_TCB_ALIGN	8

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

/* Alignment requirements for the TCB.  */
# define TLS_TCB_ALIGN		8

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

/* The thread pointer tp points to the end of the TCB.
   The pthread_descr structure is immediately in front of the TCB.  */
# define TLS_TCB_OFFSET		0

/* 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)

# define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) + 1

/* 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) \
  ({ long int result_var;						\
     result_var = INTERNAL_SYSCALL_CALL (set_thread_area, 		\
                    (char *) (tcbp) + TLS_TCB_OFFSET);			\
     INTERNAL_SYSCALL_ERROR_P (result_var)				\
       ? "unknown error" : NULL; })

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

/* Return the thread descriptor for the current thread.  */
# undef THREAD_SELF
# define THREAD_SELF \
  ((struct pthread *) (READ_THREAD_POINTER ()				\
		       - 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, sizeof (struct pthread))

/* 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)

/* Get and set the global scope generation counter in struct pthread.  */
# define THREAD_GSCOPE_IN_TCB      1
# 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)

#endif /* __ASSEMBLER__ */

#endif /* tls.h */