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1 /* Definition for thread-local data handling. NPTL/hppa version.
2 Copyright (C) 2005-2021 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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/>. */
22 #include <dl-sysdep.h>
30 #else /* __ASSEMBLER__ */
31 # include <tcb-offsets.h>
32 #endif /* __ASSEMBLER__ */
36 /* Get system call information. */
39 /* The TP points to the start of the thread blocks. */
40 # define TLS_DTV_AT_TP 1
41 # define TLS_TCB_AT_TP 0
43 /* Get the thread descriptor definition. */
44 # include <nptl/descr.h>
52 /* This is the size of the initial TCB. */
53 # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
55 /* Alignment requirements for the initial TCB. */
56 # define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t)
58 /* This is the size of the TCB. */
59 # define TLS_TCB_SIZE sizeof (tcbhead_t)
61 /* Alignment requirements for the TCB. */
62 # define TLS_TCB_ALIGN __alignof__ (struct pthread)
64 /* This is the size we need before TCB */
65 # define TLS_PRE_TCB_SIZE sizeof (struct pthread)
67 /* Install the dtv pointer. The pointer passed is to the element with
68 index -1 which contain the length. */
69 # define INSTALL_DTV(tcbp, dtvp) \
70 ((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1
72 /* Install new dtv for current thread. */
73 # define INSTALL_NEW_DTV(dtv) \
74 ({ tcbhead_t *__tcbp = (tcbhead_t *)__get_cr27(); \
78 /* Return dtv of given thread descriptor. */
79 # define GET_DTV(tcbp) \
80 (((tcbhead_t *) (tcbp))->dtv)
82 /* Code to initially initialize the thread pointer. This might need
83 special attention since 'errno' is not yet available and if the
84 operation can cause a failure 'errno' must not be touched. */
85 # define TLS_INIT_TP(tcbp) \
86 ({ __set_cr27(tcbp); NULL; })
88 /* Value passed to 'clone' for initialization of the thread register. */
89 # define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) + 1
91 /* Return the address of the dtv for the current thread. */
92 # define THREAD_DTV() \
93 ({ tcbhead_t *__tcbp = (tcbhead_t *)__get_cr27(); \
97 /* Return the thread descriptor for the current thread. */
98 # define THREAD_SELF \
99 ({ struct pthread *__self; \
100 __self = __get_cr27(); \
104 /* Magic for libthread_db to know how to do THREAD_SELF.
105 Our thread pointer is stored in cr27. See asm/elf.h for the offset into
106 elf_gregset_t. The thread descriptor is sizeof (struct pthread) away. */
107 # define DB_THREAD_SELF \
108 REGISTER (32, 32, 53 * 4, -sizeof (struct pthread))
110 # include <tcb-access.h>
112 static inline struct pthread
*__get_cr27(void)
115 asm ("mfctl %%cr27, %0" : "=r" (cr27
) : );
116 return (struct pthread
*) cr27
;
119 /* We write to cr27, clobber r26 as the input argument, and clobber
120 r31 as the link register. */
121 static inline void __set_cr27(struct pthread
*cr27
)
123 asm ( "ble 0xe0(%%sr2, %%r0)\n\t"
125 : : "r" (cr27
) : "r26", "r31" );
128 /* Get and set the global scope generation counter in struct pthread. */
129 #define THREAD_GSCOPE_FLAG_UNUSED 0
130 #define THREAD_GSCOPE_FLAG_USED 1
131 #define THREAD_GSCOPE_FLAG_WAIT 2
132 #define THREAD_GSCOPE_RESET_FLAG() \
135 = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \
136 THREAD_GSCOPE_FLAG_UNUSED); \
137 if (__res == THREAD_GSCOPE_FLAG_WAIT) \
138 lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \
141 #define THREAD_GSCOPE_SET_FLAG() \
144 THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \
145 atomic_write_barrier (); \
149 #endif /* !__ASSEMBLER__ */
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