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1 /* Definition for thread-local data handling. NPTL/PowerPC version.
2 Copyright (C) 2003-2021 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>
33 # include <asm/ptrace.h>
34 #endif /* __ASSEMBLER__ */
37 /* Register r2 (tp) is reserved by the ABI as "thread pointer". */
38 # define PT_THREAD_POINTER PT_R2
39 # ifndef __ASSEMBLER__
40 register void *__thread_register
__asm__ ("r2");
43 #else /* __powerpc64__ */
44 /* Register r13 (tp) is reserved by the ABI as "thread pointer". */
45 # define PT_THREAD_POINTER PT_R13
46 # ifndef __ASSEMBLER__
47 register void *__thread_register
__asm__ ("r13");
49 #endif /* __powerpc64__ */
53 # include <hwcapinfo.h>
55 /* Get system call information. */
58 /* The TP points to the start of the thread blocks. */
59 # define TLS_DTV_AT_TP 1
60 # define TLS_TCB_AT_TP 0
62 /* We use the multiple_threads field in the pthread struct */
63 #define TLS_MULTIPLE_THREADS_IN_TCB 1
65 /* Get the thread descriptor definition. */
66 # include <nptl/descr.h>
69 /* The stack_guard is accessed directly by GCC -fstack-protector code,
70 so it is a part of public ABI. The dtv and pointer_guard fields
74 /* Reservation for HWCAP data. To be accessed by GCC in
75 __builtin_cpu_supports(), so it is a part of public ABI. */
77 /* Reservation for AT_PLATFORM data. To be accessed by GCC in
78 __builtin_cpu_is(), so it is a part of public ABI. Since there
79 are different ABIs for 32 and 64 bit, we put this field in a
80 previously empty padding space for powerpc64. */
82 /* Padding to maintain alignment. */
87 /* Reservation for AT_PLATFORM data - powerpc64. */
91 /* Reservation for Dynamic System Optimizer ABI. */
94 /* Reservation for tar register (ISA 2.07). */
96 /* GCC split stack support. */
98 /* Reservation for the Event-Based Branching ABI. */
99 uintptr_t ebb_handler
;
100 uintptr_t ebb_ctx_pointer
;
101 uintptr_t ebb_reserved1
;
102 uintptr_t ebb_reserved2
;
103 uintptr_t pointer_guard
;
104 uintptr_t stack_guard
;
108 /* This is the size of the initial TCB. */
109 # define TLS_INIT_TCB_SIZE 0
111 /* Alignment requirements for the initial TCB. */
112 # define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread)
114 /* This is the size of the TCB. */
115 # define TLS_TCB_SIZE 0
117 /* Alignment requirements for the TCB. */
118 # define TLS_TCB_ALIGN __alignof__ (struct pthread)
120 /* This is the size we need before TCB. */
121 # define TLS_PRE_TCB_SIZE \
122 (sizeof (struct pthread) \
123 + ((sizeof (tcbhead_t) + TLS_TCB_ALIGN - 1) & ~(TLS_TCB_ALIGN - 1)))
125 /* The following assumes that TP (R2 or R13) points to the end of the
126 TCB + 0x7000 (per the ABI). This implies that TCB address is
127 TP - 0x7000. As we define TLS_DTV_AT_TP we can
128 assume that the pthread struct is allocated immediately ahead of the
129 TCB. This implies that the pthread_descr address is
130 TP - (TLS_PRE_TCB_SIZE + 0x7000). */
131 # define TLS_TCB_OFFSET 0x7000
133 /* Install the dtv pointer. The pointer passed is to the element with
134 index -1 which contain the length. */
135 # define INSTALL_DTV(tcbp, dtvp) \
136 ((tcbhead_t *) (tcbp))[-1].dtv = dtvp + 1
138 /* Install new dtv for current thread. */
139 # define INSTALL_NEW_DTV(dtv) (THREAD_DTV() = (dtv))
141 /* Return dtv of given thread descriptor. */
142 # define GET_DTV(tcbp) (((tcbhead_t *) (tcbp))[-1].dtv)
144 /* Code to initially initialize the thread pointer. This might need
145 special attention since 'errno' is not yet available and if the
146 operation can cause a failure 'errno' must not be touched. */
147 # define TLS_INIT_TP(tcbp) \
149 __thread_register = (void *) (tcbp) + TLS_TCB_OFFSET; \
150 THREAD_SET_HWCAP (__tcb_hwcap); \
151 THREAD_SET_AT_PLATFORM (__tcb_platform); \
155 /* Value passed to 'clone' for initialization of the thread register. */
156 # define TLS_DEFINE_INIT_TP(tp, pd) \
157 void *tp = (void *) (pd) + TLS_TCB_OFFSET + TLS_PRE_TCB_SIZE; \
158 (((tcbhead_t *) ((char *) tp - TLS_TCB_OFFSET))[-1].hwcap) = \
159 THREAD_GET_HWCAP (); \
160 (((tcbhead_t *) ((char *) tp - TLS_TCB_OFFSET))[-1].at_platform) = \
161 THREAD_GET_AT_PLATFORM ();
163 /* Return the address of the dtv for the current thread. */
164 # define THREAD_DTV() \
165 (((tcbhead_t *) (__thread_register - TLS_TCB_OFFSET))[-1].dtv)
167 /* Return the thread descriptor for the current thread. */
168 # define THREAD_SELF \
169 ((struct pthread *) (__thread_register \
170 - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE))
172 /* Magic for libthread_db to know how to do THREAD_SELF. */
173 # define DB_THREAD_SELF \
174 REGISTER (32, 32, PT_THREAD_POINTER * 4, \
175 - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE) \
176 REGISTER (64, 64, PT_THREAD_POINTER * 8, \
177 - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE)
179 /* Read member of the thread descriptor directly. */
180 # define THREAD_GETMEM(descr, member) ((void)(descr), (THREAD_SELF)->member)
182 /* Same as THREAD_GETMEM, but the member offset can be non-constant. */
183 # define THREAD_GETMEM_NC(descr, member, idx) \
184 ((void)(descr), (THREAD_SELF)->member[idx])
186 /* Set member of the thread descriptor directly. */
187 # define THREAD_SETMEM(descr, member, value) \
188 ((void)(descr), (THREAD_SELF)->member = (value))
190 /* Same as THREAD_SETMEM, but the member offset can be non-constant. */
191 # define THREAD_SETMEM_NC(descr, member, idx, value) \
192 ((void)(descr), (THREAD_SELF)->member[idx] = (value))
194 /* Set the stack guard field in TCB head. */
195 # define THREAD_SET_STACK_GUARD(value) \
196 (((tcbhead_t *) ((char *) __thread_register \
197 - TLS_TCB_OFFSET))[-1].stack_guard = (value))
198 # define THREAD_COPY_STACK_GUARD(descr) \
199 (((tcbhead_t *) ((char *) (descr) \
200 + TLS_PRE_TCB_SIZE))[-1].stack_guard \
201 = ((tcbhead_t *) ((char *) __thread_register \
202 - TLS_TCB_OFFSET))[-1].stack_guard)
204 /* Set the stack guard field in TCB head. */
205 # define THREAD_GET_POINTER_GUARD() \
206 (((tcbhead_t *) ((char *) __thread_register \
207 - TLS_TCB_OFFSET))[-1].pointer_guard)
208 # define THREAD_SET_POINTER_GUARD(value) \
209 (THREAD_GET_POINTER_GUARD () = (value))
210 # define THREAD_COPY_POINTER_GUARD(descr) \
211 (((tcbhead_t *) ((char *) (descr) \
212 + TLS_PRE_TCB_SIZE))[-1].pointer_guard \
213 = THREAD_GET_POINTER_GUARD())
215 /* hwcap field in TCB head. */
216 # define THREAD_GET_HWCAP() \
217 (((tcbhead_t *) ((char *) __thread_register \
218 - TLS_TCB_OFFSET))[-1].hwcap)
219 # define THREAD_SET_HWCAP(value) \
220 (THREAD_GET_HWCAP () = (value))
222 /* at_platform field in TCB head. */
223 # define THREAD_GET_AT_PLATFORM() \
224 (((tcbhead_t *) ((char *) __thread_register \
225 - TLS_TCB_OFFSET))[-1].at_platform)
226 # define THREAD_SET_AT_PLATFORM(value) \
227 (THREAD_GET_AT_PLATFORM () = (value))
229 /* l_tls_offset == 0 is perfectly valid on PPC, so we have to use some
230 different value to mean unset l_tls_offset. */
231 # define NO_TLS_OFFSET -1
233 /* Get and set the global scope generation counter in struct pthread. */
234 #define THREAD_GSCOPE_IN_TCB 1
235 #define THREAD_GSCOPE_FLAG_UNUSED 0
236 #define THREAD_GSCOPE_FLAG_USED 1
237 #define THREAD_GSCOPE_FLAG_WAIT 2
238 #define THREAD_GSCOPE_RESET_FLAG() \
241 = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \
242 THREAD_GSCOPE_FLAG_UNUSED); \
243 if (__res == THREAD_GSCOPE_FLAG_WAIT) \
244 lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \
247 #define THREAD_GSCOPE_SET_FLAG() \
250 THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \
251 atomic_write_barrier (); \
255 #endif /* __ASSEMBLER__ */