1 /* Definition for thread-local data handling. NPTL/MIPS 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
28 /* Type for the dtv. */
39 /* Note: rd must be $v1 to be ABI-conformant. */
40 # define READ_THREAD_POINTER() \
42 __asm__ __volatile__ (".set\tpush\n\t.set\tmips32r2\n\t" \
43 "rdhwr\t%0, $29\n\t.set\tpop" : "=v" (__result)); \
46 #else /* __ASSEMBLER__ */
47 # include <tcb-offsets.h>
49 # define READ_THREAD_POINTER(rd) \
54 #endif /* __ASSEMBLER__ */
57 /* We require TLS support in the tools. */
58 #define HAVE_TLS_SUPPORT 1
59 #define HAVE_TLS_MODEL_ATTRIBUTE 1
60 #define HAVE___THREAD 1
62 /* Signal that TLS support is available. */
67 /* Get system call information. */
70 /* The TP points to the start of the thread blocks. */
71 # define TLS_DTV_AT_TP 1
73 /* Get the thread descriptor definition. */
74 #include <../../descr.h>
82 /* This is the size of the initial TCB. Because our TCB is before the thread
83 pointer, we don't need this. */
84 # define TLS_INIT_TCB_SIZE 0
86 /* Alignment requirements for the initial TCB. */
87 # define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread)
89 /* This is the size of the TCB. Because our TCB is before the thread
90 pointer, we don't need this. */
91 # define TLS_TCB_SIZE 0
93 /* Alignment requirements for the TCB. */
94 # define TLS_TCB_ALIGN __alignof__ (struct pthread)
96 /* This is the size we need before TCB - actually, it includes the TCB. */
97 # define TLS_PRE_TCB_SIZE \
98 (sizeof (struct pthread) \
99 + ((sizeof (tcbhead_t) + TLS_TCB_ALIGN - 1) & ~(TLS_TCB_ALIGN - 1)))
101 /* The thread pointer (in hardware register $29) points to the end of
102 the TCB + 0x7000, as for PowerPC. The pthread_descr structure is
103 immediately in front of the TCB. */
104 # define TLS_TCB_OFFSET 0x7000
106 /* Install the dtv pointer. The pointer passed is to the element with
107 index -1 which contain the length. */
108 # define INSTALL_DTV(tcbp, dtvp) \
109 (((tcbhead_t *) (tcbp))[-1].dtv = (dtvp) + 1)
111 /* Install new dtv for current thread. */
112 # define INSTALL_NEW_DTV(dtv) \
113 (THREAD_DTV() = (dtv))
115 /* Return dtv of given thread descriptor. */
116 # define GET_DTV(tcbp) \
117 (((tcbhead_t *) (tcbp))[-1].dtv)
119 /* Code to initially initialize the thread pointer. This might need
120 special attention since 'errno' is not yet available and if the
121 operation can cause a failure 'errno' must not be touched. */
122 # define TLS_INIT_TP(tcbp, secondcall) \
123 ({ INTERNAL_SYSCALL_DECL (err); \
125 result_var = INTERNAL_SYSCALL (set_thread_area, err, 1, \
126 (char *) (tcbp) + TLS_TCB_OFFSET); \
127 INTERNAL_SYSCALL_ERROR_P (result_var, err) \
128 ? "unknown error" : NULL; })
130 /* Return the address of the dtv for the current thread. */
131 # define THREAD_DTV() \
132 (((tcbhead_t *) (READ_THREAD_POINTER () - TLS_TCB_OFFSET))[-1].dtv)
134 /* Return the thread descriptor for the current thread. */
135 # define THREAD_SELF \
136 ((struct pthread *) (READ_THREAD_POINTER () \
137 - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE))
139 /* Magic for libthread_db to know how to do THREAD_SELF. */
140 # define DB_THREAD_SELF \
141 CONST_THREAD_AREA (32, TLS_TCB_OFFSET + TLS_PRE_TCB_SIZE)
143 /* Access to data in the thread descriptor is easy. */
144 # define THREAD_GETMEM(descr, member) \
146 # define THREAD_GETMEM_NC(descr, member, idx) \
148 # define THREAD_SETMEM(descr, member, value) \
149 descr->member = (value)
150 # define THREAD_SETMEM_NC(descr, member, idx, value) \
151 descr->member[idx] = (value)
153 /* l_tls_offset == 0 is perfectly valid on MIPS, so we have to use some
154 different value to mean unset l_tls_offset. */
155 # define NO_TLS_OFFSET -1
156 /* Get and set the global scope generation counter in struct pthread. */
157 #define THREAD_GSCOPE_FLAG_UNUSED 0
158 #define THREAD_GSCOPE_FLAG_USED 1
159 #define THREAD_GSCOPE_FLAG_WAIT 2
160 #define THREAD_GSCOPE_RESET_FLAG() \
163 = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \
164 THREAD_GSCOPE_FLAG_UNUSED); \
165 if (__res == THREAD_GSCOPE_FLAG_WAIT) \
166 lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \
169 #define THREAD_GSCOPE_SET_FLAG() \
172 THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \
173 atomic_write_barrier (); \
176 #define THREAD_GSCOPE_WAIT() \
177 GL(dl_wait_lookup_done) ()
179 #endif /* __ASSEMBLER__ */