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, see
17 <http://www.gnu.org/licenses/>. */
27 /* Type for the dtv. */
38 /* Note: rd must be $v1 to be ABI-conformant. */
39 # define READ_THREAD_POINTER() \
41 __asm__ __volatile__ (".set\tpush\n\t.set\tmips32r2\n\t" \
42 "rdhwr\t%0, $29\n\t.set\tpop" : "=v" (__result)); \
45 #else /* __ASSEMBLER__ */
46 # include <tcb-offsets.h>
48 # define READ_THREAD_POINTER(rd) \
53 #endif /* __ASSEMBLER__ */
56 /* We require TLS support in the tools. */
57 #define HAVE_TLS_SUPPORT 1
58 #define HAVE_TLS_MODEL_ATTRIBUTE 1
59 #define HAVE___THREAD 1
61 /* Signal that TLS support is available. */
66 /* Get system call information. */
69 /* The TP points to the start of the thread blocks. */
70 # define TLS_DTV_AT_TP 1
72 /* Get the thread descriptor definition. */
73 #include <../../descr.h>
81 /* This is the size of the initial TCB. Because our TCB is before the thread
82 pointer, we don't need this. */
83 # define TLS_INIT_TCB_SIZE 0
85 /* Alignment requirements for the initial TCB. */
86 # define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread)
88 /* This is the size of the TCB. Because our TCB is before the thread
89 pointer, we don't need this. */
90 # define TLS_TCB_SIZE 0
92 /* Alignment requirements for the TCB. */
93 # define TLS_TCB_ALIGN __alignof__ (struct pthread)
95 /* This is the size we need before TCB - actually, it includes the TCB. */
96 # define TLS_PRE_TCB_SIZE \
97 (sizeof (struct pthread) \
98 + ((sizeof (tcbhead_t) + TLS_TCB_ALIGN - 1) & ~(TLS_TCB_ALIGN - 1)))
100 /* The thread pointer (in hardware register $29) points to the end of
101 the TCB + 0x7000, as for PowerPC. The pthread_descr structure is
102 immediately in front of the TCB. */
103 # define TLS_TCB_OFFSET 0x7000
105 /* Install the dtv pointer. The pointer passed is to the element with
106 index -1 which contain the length. */
107 # define INSTALL_DTV(tcbp, dtvp) \
108 (((tcbhead_t *) (tcbp))[-1].dtv = (dtvp) + 1)
110 /* Install new dtv for current thread. */
111 # define INSTALL_NEW_DTV(dtv) \
112 (THREAD_DTV() = (dtv))
114 /* Return dtv of given thread descriptor. */
115 # define GET_DTV(tcbp) \
116 (((tcbhead_t *) (tcbp))[-1].dtv)
118 /* Code to initially initialize the thread pointer. This might need
119 special attention since 'errno' is not yet available and if the
120 operation can cause a failure 'errno' must not be touched. */
121 # define TLS_INIT_TP(tcbp, secondcall) \
122 ({ INTERNAL_SYSCALL_DECL (err); \
123 long result_var attribute_unused; \
124 result_var = INTERNAL_SYSCALL (set_thread_area, err, 1, \
125 (char *) (tcbp) + TLS_TCB_OFFSET); \
126 INTERNAL_SYSCALL_ERROR_P (result_var, err) \
127 ? "unknown error" : NULL; })
129 /* Return the address of the dtv for the current thread. */
130 # define THREAD_DTV() \
131 (((tcbhead_t *) (READ_THREAD_POINTER () - TLS_TCB_OFFSET))[-1].dtv)
133 /* Return the thread descriptor for the current thread. */
134 # define THREAD_SELF \
135 ((struct pthread *) (READ_THREAD_POINTER () \
136 - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE))
138 /* Magic for libthread_db to know how to do THREAD_SELF. */
139 # define DB_THREAD_SELF \
140 CONST_THREAD_AREA (32, TLS_TCB_OFFSET + TLS_PRE_TCB_SIZE)
142 /* Access to data in the thread descriptor is easy. */
143 # define THREAD_GETMEM(descr, member) \
145 # define THREAD_GETMEM_NC(descr, member, idx) \
147 # define THREAD_SETMEM(descr, member, value) \
148 descr->member = (value)
149 # define THREAD_SETMEM_NC(descr, member, idx, value) \
150 descr->member[idx] = (value)
152 /* l_tls_offset == 0 is perfectly valid on MIPS, so we have to use some
153 different value to mean unset l_tls_offset. */
154 # define NO_TLS_OFFSET -1
155 /* Get and set the global scope generation counter in struct pthread. */
156 #define THREAD_GSCOPE_FLAG_UNUSED 0
157 #define THREAD_GSCOPE_FLAG_USED 1
158 #define THREAD_GSCOPE_FLAG_WAIT 2
159 #define THREAD_GSCOPE_RESET_FLAG() \
162 = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \
163 THREAD_GSCOPE_FLAG_UNUSED); \
164 if (__res == THREAD_GSCOPE_FLAG_WAIT) \
165 lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \
168 #define THREAD_GSCOPE_SET_FLAG() \
171 THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \
172 atomic_write_barrier (); \
175 #define THREAD_GSCOPE_WAIT() \
176 GL(dl_wait_lookup_done) ()
178 #endif /* __ASSEMBLER__ */