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1 | /* Definition for thread-local data handling. NPTL/hppa version. |
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2 | Copyright (C) 2005-2022 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, 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 | /* This is the size of the initial TCB. */ |
50 | # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t) |
51 | |
52 | /* This is the size of the TCB. */ |
53 | # define TLS_TCB_SIZE sizeof (tcbhead_t) |
54 | |
55 | /* This is the size we need before TCB */ |
56 | # define TLS_PRE_TCB_SIZE sizeof (struct pthread) |
57 | |
58 | /* Install the dtv pointer. The pointer passed is to the element with |
59 | index -1 which contain the length. */ |
60 | # define INSTALL_DTV(tcbp, dtvp) \ |
61 | ((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1 |
62 | |
63 | /* Install new dtv for current thread. */ |
64 | # define INSTALL_NEW_DTV(dtv) \ |
65 | ({ tcbhead_t *__tcbp = (tcbhead_t *)__get_cr27(); \ |
66 | __tcbp->dtv = dtv; \ |
67 | }) |
68 | |
69 | /* Return dtv of given thread descriptor. */ |
70 | # define GET_DTV(tcbp) \ |
71 | (((tcbhead_t *) (tcbp))->dtv) |
72 | |
73 | /* Code to initially initialize the thread pointer. This might need |
74 | special attention since 'errno' is not yet available and if the |
75 | operation can cause a failure 'errno' must not be touched. */ |
76 | # define TLS_INIT_TP(tcbp) \ |
77 | ({ __set_cr27(tcbp); NULL; }) |
78 | |
79 | /* Value passed to 'clone' for initialization of the thread register. */ |
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 *__tcbp = (tcbhead_t *)__get_cr27(); \ |
85 | __tcbp->dtv; \ |
86 | }) |
87 | |
88 | /* Return the thread descriptor for the current thread. */ |
89 | # define THREAD_SELF \ |
90 | ({ struct pthread *__self; \ |
91 | __self = __get_cr27(); \ |
92 | __self - 1; \ |
93 | }) |
94 | |
95 | /* Magic for libthread_db to know how to do THREAD_SELF. |
96 | Our thread pointer is stored in cr27. See asm/elf.h for the offset into |
97 | elf_gregset_t. The thread descriptor is sizeof (struct pthread) away. */ |
98 | # define DB_THREAD_SELF \ |
99 | REGISTER (32, 32, 53 * 4, -sizeof (struct pthread)) |
100 | |
101 | # include <tcb-access.h> |
102 | |
103 | static inline struct pthread *__get_cr27(void) |
104 | { |
105 | long cr27; |
106 | asm ("mfctl %%cr27, %0" : "=r" (cr27) : ); |
107 | return (struct pthread *) cr27; |
108 | } |
109 | |
110 | /* We write to cr27, clobber r26 as the input argument, and clobber |
111 | r31 as the link register. */ |
112 | static inline void __set_cr27(struct pthread *cr27) |
113 | { |
114 | asm ( "ble 0xe0(%%sr2, %%r0)\n\t" |
115 | "copy %0, %%r26" |
116 | : : "r" (cr27) : "r26", "r31" ); |
117 | } |
118 | |
119 | /* Get and set the global scope generation counter in struct pthread. */ |
120 | #define THREAD_GSCOPE_FLAG_UNUSED 0 |
121 | #define THREAD_GSCOPE_FLAG_USED 1 |
122 | #define THREAD_GSCOPE_FLAG_WAIT 2 |
123 | #define THREAD_GSCOPE_RESET_FLAG() \ |
124 | do \ |
125 | { int __res \ |
126 | = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \ |
127 | THREAD_GSCOPE_FLAG_UNUSED); \ |
128 | if (__res == THREAD_GSCOPE_FLAG_WAIT) \ |
129 | lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \ |
130 | } \ |
131 | while (0) |
132 | #define THREAD_GSCOPE_SET_FLAG() \ |
133 | do \ |
134 | { \ |
135 | THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \ |
136 | atomic_write_barrier (); \ |
137 | } \ |
138 | while (0) |
139 | |
140 | #endif /* !__ASSEMBLER__ */ |
141 | |
142 | #endif /* tls.h */ |
143 |
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