1 /* Definition for thread-local data handling. NPTL/hppa version.
2 Copyright (C) 2005, 2007 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, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
23 #include <dl-sysdep.h>
30 /* Type for the dtv. */
41 #else /* __ASSEMBLER__ */
42 # include <tcb-offsets.h>
43 #endif /* __ASSEMBLER__ */
46 /* We require TLS support in the tools. */
47 #ifndef HAVE_TLS_SUPPORT
48 # error "TLS support is required."
51 /* Signal that TLS support is available. */
56 /* Get system call information. */
59 /* The TP points to the start of the thread blocks. */
60 # define TLS_DTV_AT_TP 1
62 /* Get the thread descriptor definition. */
63 # include <nptl/descr.h>
71 /* This is the size of the initial TCB. */
72 # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
74 /* Alignment requirements for the initial TCB. */
75 # define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t)
77 /* This is the size of the TCB. */
78 # define TLS_TCB_SIZE sizeof (tcbhead_t)
80 /* Alignment requirements for the TCB. */
81 # define TLS_TCB_ALIGN __alignof__ (struct pthread)
83 /* This is the size we need before TCB */
84 # define TLS_PRE_TCB_SIZE sizeof (struct pthread)
86 /* Install the dtv pointer. The pointer passed is to the element with
87 index -1 which contain the length. */
88 # define INSTALL_DTV(tcbp, dtvp) \
89 ((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1
91 /* Install new dtv for current thread. */
92 # define INSTALL_NEW_DTV(dtv) \
93 ({ tcbhead_t *__tcbp = (tcbhead_t *)__get_cr27(); \
97 /* Return dtv of given thread descriptor. */
98 # define GET_DTV(tcbp) \
99 (((tcbhead_t *) (tcbp))->dtv)
101 /* Code to initially initialize the thread pointer. This might need
102 special attention since 'errno' is not yet available and if the
103 operation can cause a failure 'errno' must not be touched. */
104 # define TLS_INIT_TP(tcbp, secondcall) \
105 ({ __set_cr27(tcbp); NULL; })
107 /* Return the address of the dtv for the current thread. */
108 # define THREAD_DTV() \
109 ({ tcbhead_t *__tcbp = (tcbhead_t *)__get_cr27(); \
113 /* Return the thread descriptor for the current thread. */
114 # define THREAD_SELF \
115 ({ struct pthread *__self; \
116 __self = __get_cr27(); \
120 /* Magic for libthread_db to know how to do THREAD_SELF.
121 Our thread pointer is stored in cr27. See asm/elf.h for the offset into
122 elf_gregset_t. The thread descriptor is sizeof (struct pthread) away. */
123 # define DB_THREAD_SELF \
124 REGISTER (32, 32, 53 * 4, -sizeof (struct pthread))
126 /* Access to data in the thread descriptor is easy. */
127 # define THREAD_GETMEM(descr, member) \
129 # define THREAD_GETMEM_NC(descr, member, idx) \
131 # define THREAD_SETMEM(descr, member, value) \
132 descr->member = (value)
133 # define THREAD_SETMEM_NC(descr, member, idx, value) \
134 descr->member[idx] = (value)
136 static inline struct pthread *__get_cr27(void)
139 asm ("mfctl %%cr27, %0" : "=r" (cr27) : );
140 return (struct pthread *) cr27;
143 static inline void __set_cr27(struct pthread *cr27)
145 asm ( "ble 0xe0(%%sr2, %%r0)\n\t"
147 : : "r" (cr27) : "r26" );
150 /* Get and set the global scope generation counter in struct pthread. */
151 #define THREAD_GSCOPE_FLAG_UNUSED 0
152 #define THREAD_GSCOPE_FLAG_USED 1
153 #define THREAD_GSCOPE_FLAG_WAIT 2
154 #define THREAD_GSCOPE_RESET_FLAG() \
157 = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \
158 THREAD_GSCOPE_FLAG_UNUSED); \
159 if (__res == THREAD_GSCOPE_FLAG_WAIT) \
160 lll_private_futex_wake (&THREAD_SELF->header.gscope_flag, 1); \
163 #define THREAD_GSCOPE_SET_FLAG() \
166 THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \
167 atomic_write_barrier (); \
170 #define THREAD_GSCOPE_WAIT() \
171 GL(dl_wait_lookup_done) ()
173 #endif /* !__ASSEMBLER__ */