1 /* Definition for thread-local data handling. NPTL/SH version.
2 Copyright (C) 2003 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>
29 /* Type for the dtv. */
42 #else /* __ASSEMBLER__ */
43 # include <tcb-offsets.h>
44 #endif /* __ASSEMBLER__ */
47 /* We require TLS support in the tools. */
48 #ifndef HAVE_TLS_SUPPORT
49 # error "TLS support is required."
52 /* Signal that TLS support is available. */
57 /* Get system call information. */
60 /* Get the thread descriptor definition. */
61 # include <nptl/descr.h>
63 /* This is the size of the initial TCB. */
64 # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
66 /* Alignment requirements for the initial TCB. */
67 # define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t)
69 /* This is the size of the TCB. */
70 # define TLS_TCB_SIZE sizeof (tcbhead_t)
72 /* This is the size we need before TCB. */
73 # define TLS_PRE_TCB_SIZE sizeof (struct pthread)
75 /* Alignment requirements for the TCB. */
76 # define TLS_TCB_ALIGN __alignof__ (struct pthread)
78 /* The TLS blocks start right after the TCB. */
79 # define TLS_DTV_AT_TP 1
82 /* Install the dtv pointer. The pointer passed is to the element with
83 index -1 which contain the length. */
84 # define INSTALL_DTV(tcbp, dtvp) \
85 ((tcbhead_t *) (tcbp))->dtv = dtvp + 1
87 /* Install new dtv for current thread. */
88 # define INSTALL_NEW_DTV(dtv) \
89 ({ tcbhead_t *__tcbp; \
90 __asm __volatile ("stc gbr,%0" : "=r" (__tcbp)); \
91 __tcbp->dtv = (dtv);})
93 /* Return dtv of given thread descriptor. */
94 # define GET_DTV(tcbp) \
95 (((tcbhead_t *) (tcbp))->dtv)
97 /* Code to initially initialize the thread pointer. This might need
98 special attention since 'errno' is not yet available and if the
99 operation can cause a failure 'errno' must not be touched. */
100 # define TLS_INIT_TP(tcbp, secondcall) \
101 ({ __asm __volatile ("ldc %0,gbr" : : "r" (tcbp)); 0; })
103 /* Return the address of the dtv for the current thread. */
104 # define THREAD_DTV() \
105 ({ tcbhead_t *__tcbp; \
106 __asm __volatile ("stc gbr,%0" : "=r" (__tcbp)); \
109 /* Return the thread descriptor for the current thread.
110 The contained asm must *not* be marked volatile since otherwise
112 struct pthread *self = thread_self();
113 do not get optimized away. */
114 # define THREAD_SELF \
115 ({ struct pthread *__self; \
116 __asm ("stc gbr,%0" : "=r" (__self)); \
119 /* Read member of the thread descriptor directly. */
120 # define THREAD_GETMEM(descr, member) ((THREAD_SELF)->member)
122 /* Same as THREAD_GETMEM, but the member offset can be non-constant. */
123 # define THREAD_GETMEM_NC(descr, member, idx) ((THREAD_SELF)->member[idx])
125 /* Set member of the thread descriptor directly. */
126 # define THREAD_SETMEM(descr, member, value) \
127 (THREAD_SELF)->member = (value)
129 /* Same as THREAD_SETMEM, but the member offset can be non-constant. */
130 # define THREAD_SETMEM_NC(descr, member, idx, value) \
131 (THREAD_SELF)->member[idx] = (value)
133 #endif /* __ASSEMBLER__ */