1 /* Copyright (C) 2005-2022 Free Software Foundation, Inc.
2 
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 License as
7    published by the Free Software Foundation; either version 2.1 of the
8    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, see
17    <https://www.gnu.org/licenses/>.  */
18 
19 #ifndef _TLS_H
20 # define _TLS_H 1
21 
22 # include <dl-sysdep.h>
23 
24 #ifndef __ASSEMBLER__
25 # include <stdbool.h>
26 # include <stddef.h>
27 # include <stdint.h>
28 # include <dl-dtv.h>
29 #endif /* __ASSEMBLER__ */
30 
31 #ifndef __ASSEMBLER__
32 
33 /* Get system call information.  */
34 # include <sysdep.h>
35 
36 /* The TP points to the start of the thread blocks.  */
37 # define TLS_DTV_AT_TP  1
38 # define TLS_TCB_AT_TP  0
39 
40 /* Get the thread descriptor definition.  */
41 # include <nptl/descr.h>
42 
43 typedef struct
44 {
45   dtv_t *dtv;
46   void *private;
47 } tcbhead_t;
48 
49 #define READ_THREAD_POINTER() \
50   ({ register void *__microblaze_thread_area asm ("r21"); \
51      __microblaze_thread_area; })
52 
53 /* This is the size of the initial TCB.  */
54 # define TLS_INIT_TCB_SIZE  sizeof (tcbhead_t)
55 
56 /* This is the size of the TCB.  */
57 # define TLS_TCB_SIZE       sizeof (tcbhead_t)
58 
59 /* This is the size we need before TCB.  */
60 # define TLS_PRE_TCB_SIZE   sizeof (struct pthread)
61 
62 /* Install the dtv pointer.  The pointer passed is to the element with
63    index -1 which contain the length.  */
64 # define INSTALL_DTV(tcbp, dtvp) \
65   (((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1)
66 
67 /* Install new dtv for current thread.  */
68 # define INSTALL_NEW_DTV(dtv) \
69   (THREAD_DTV() = (dtv))
70 
71 /* Return dtv of given thread descriptor.  */
72 # define GET_DTV(tcbp) \
73   (((tcbhead_t *) (tcbp))->dtv)
74 
75 /* Code to initially initialize the thread pointer.
76    r21 is reserved for thread pointer.  */
77 # define TLS_INIT_TP(tcbp) \
78   ({ __asm __volatile ("or r21,r0,%0" : : "r" ((void *)tcbp)); NULL; })
79 
80 # define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) + 1
81 
82 /* Return the address of the dtv for the current thread.  */
83 # define THREAD_DTV() \
84   (((tcbhead_t *) READ_THREAD_POINTER())->dtv)
85 
86 /* Return the thread descriptor for the current thread.  */
87 # define THREAD_SELF \
88   (((struct pthread *) READ_THREAD_POINTER()) - 1)
89 
90 /* Magic for libthread_db to know how to do THREAD_SELF.  */
91 # define DB_THREAD_SELF \
92   CONST_THREAD_AREA (32, sizeof (struct pthread))
93 
94 # include <tcb-access.h>
95 
96 /* Get and set the global scope generation counter in struct pthread.  */
97 # define THREAD_GSCOPE_FLAG_UNUSED 0
98 # define THREAD_GSCOPE_FLAG_USED   1
99 # define THREAD_GSCOPE_FLAG_WAIT   2
100 # define THREAD_GSCOPE_RESET_FLAG()                                         \
101   do                                                                        \
102     { int __res                                                             \
103       = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag,              \
104                              THREAD_GSCOPE_FLAG_UNUSED);                    \
105       if (__res == THREAD_GSCOPE_FLAG_WAIT)                                 \
106         lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE);  \
107     }                                                                       \
108   while (0)
109 # define THREAD_GSCOPE_SET_FLAG()                                           \
110   do                                                                        \
111     {                                                                       \
112       THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED;            \
113       atomic_write_barrier ();                                              \
114     }                                                                       \
115   while (0)
116 
117 #endif /* __ASSEMBLER__ */
118 
119 #endif /* tls.h.  */
120