1 /* Definition for thread-local data handling. NPTL/hppa version.
2 Copyright (C) 2005, 2007, 2010, 2011 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 <http://www.gnu.org/licenses/>. */
22 #include <dl-sysdep.h>
29 /* Type for the dtv. */
40 #else /* __ASSEMBLER__ */
41 # include <tcb-offsets.h>
42 #endif /* __ASSEMBLER__ */
44 /* Signal that TLS support is available. */
49 /* Get system call information. */
52 /* The TP points to the start of the thread blocks. */
53 # define TLS_DTV_AT_TP 1
55 /* Get the thread descriptor definition. */
56 # include <nptl/descr.h>
64 /* This is the size of the initial TCB. */
65 # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
67 /* Alignment requirements for the initial TCB. */
68 # define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t)
70 /* This is the size of the TCB. */
71 # define TLS_TCB_SIZE sizeof (tcbhead_t)
73 /* Alignment requirements for the TCB. */
74 # define TLS_TCB_ALIGN __alignof__ (struct pthread)
76 /* This is the size we need before TCB */
77 # define TLS_PRE_TCB_SIZE sizeof (struct pthread)
79 /* Install the dtv pointer. The pointer passed is to the element with
80 index -1 which contain the length. */
81 # define INSTALL_DTV(tcbp, dtvp) \
82 ((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1
84 /* Install new dtv for current thread. */
85 # define INSTALL_NEW_DTV(dtv) \
86 ({ tcbhead_t *__tcbp = (tcbhead_t *)__get_cr27(); \
90 /* Return dtv of given thread descriptor. */
91 # define GET_DTV(tcbp) \
92 (((tcbhead_t *) (tcbp))->dtv)
94 /* Code to initially initialize the thread pointer. This might need
95 special attention since 'errno' is not yet available and if the
96 operation can cause a failure 'errno' must not be touched. */
97 # define TLS_INIT_TP(tcbp, secondcall) \
98 ({ __set_cr27(tcbp); NULL; })
100 /* Return the address of the dtv for the current thread. */
101 # define THREAD_DTV() \
102 ({ tcbhead_t *__tcbp = (tcbhead_t *)__get_cr27(); \
106 /* Return the thread descriptor for the current thread. */
107 # define THREAD_SELF \
108 ({ struct pthread *__self; \
109 __self = __get_cr27(); \
113 /* Magic for libthread_db to know how to do THREAD_SELF.
114 Our thread pointer is stored in cr27. See asm/elf.h for the offset into
115 elf_gregset_t. The thread descriptor is sizeof (struct pthread) away. */
116 # define DB_THREAD_SELF \
117 REGISTER (32, 32, 53 * 4, -sizeof (struct pthread))
119 /* Access to data in the thread descriptor is easy. */
120 # define THREAD_GETMEM(descr, member) \
122 # define THREAD_GETMEM_NC(descr, member, idx) \
124 # define THREAD_SETMEM(descr, member, value) \
125 descr->member = (value)
126 # define THREAD_SETMEM_NC(descr, member, idx, value) \
127 descr->member[idx] = (value)
129 static inline struct pthread
*__get_cr27(void)
132 asm ("mfctl %%cr27, %0" : "=r" (cr27
) : );
133 return (struct pthread
*) cr27
;
136 /* We write to cr27, clobber r26 as the input argument, and clobber
137 r31 as the link register. */
138 static inline void __set_cr27(struct pthread
*cr27
)
140 asm ( "ble 0xe0(%%sr2, %%r0)\n\t"
142 : : "r" (cr27
) : "r26", "r31" );
145 /* Get and set the global scope generation counter in struct pthread. */
146 #define THREAD_GSCOPE_FLAG_UNUSED 0
147 #define THREAD_GSCOPE_FLAG_USED 1
148 #define THREAD_GSCOPE_FLAG_WAIT 2
149 #define THREAD_GSCOPE_RESET_FLAG() \
152 = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \
153 THREAD_GSCOPE_FLAG_UNUSED); \
154 if (__res == THREAD_GSCOPE_FLAG_WAIT) \
155 lll_private_futex_wake (&THREAD_SELF->header.gscope_flag, 1); \
158 #define THREAD_GSCOPE_SET_FLAG() \
161 THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \
162 atomic_write_barrier (); \
165 #define THREAD_GSCOPE_WAIT() \
166 GL(dl_wait_lookup_done) ()
168 #endif /* !__ASSEMBLER__ */