1 /* Definition for thread-local data handling. linuxthreads/SH version.
2 Copyright (C) 2002, 2003, 2005 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/>. */
22 # include <pt-machine.h>
29 /* Type for the dtv. */
39 void *tcb; /* Pointer to the TCB. Not necessary the
40 thread descriptor used by libpthread. */
42 void *self; /* Pointer to the thread descriptor. */
46 /* We can support TLS only if the floating-stack support is available. */
47 #if defined FLOATING_STACKS && defined HAVE_TLS_SUPPORT
49 /* Get system call information. */
52 /* Signal that TLS support is available. */
56 /* Get the thread descriptor definition. */
57 # include <linuxthreads/descr.h>
59 /* This is the size of the initial TCB. */
60 # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
62 /* Alignment requirements for the initial TCB. */
63 # define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t)
65 /* This is the size of the TCB. */
66 # define TLS_TCB_SIZE sizeof (struct _pthread_descr_struct)
68 /* Alignment requirements for the TCB. */
69 # define TLS_TCB_ALIGN __alignof__ (struct _pthread_descr_struct)
71 /* The TLS blocks start right after the TCB. */
72 # define TLS_DTV_AT_TP 1
75 /* Install the dtv pointer. The pointer passed is to the element with
76 index -1 which contain the length. */
77 # define INSTALL_DTV(descr, dtvp) \
78 ((tcbhead_t *) (descr))->dtv = dtvp + 1
80 /* Install new dtv for current thread. */
81 # define INSTALL_NEW_DTV(dtv) \
82 ({ struct _pthread_descr_struct *__descr; \
83 THREAD_SETMEM (__descr, p_header.data.dtvp, (dtv)); })
85 /* Return dtv of given thread descriptor. */
86 # define GET_DTV(descr) \
87 (((tcbhead_t *) (descr))->dtv)
89 /* Code to initially initialize the thread pointer. This might need
90 special attention since 'errno' is not yet available and if the
91 operation can cause a failure 'errno' must not be touched. */
92 # define TLS_INIT_TP(descr, secondcall) \
94 void *_descr = (descr); \
96 tcbhead_t *head = _descr; \
99 /* For now the thread descriptor is at the same address. */ \
100 head->self = _descr; \
102 __asm__ ("ldc %0,gbr" : : "r" (_descr)); \
108 /* Return the address of the dtv for the current thread. */
109 # define THREAD_DTV() \
110 ({ struct _pthread_descr_struct *__descr; \
111 THREAD_GETMEM (__descr, p_header.data.dtvp); })
113 #endif /* FLOATING_STACKS && HAVE_TLS_SUPPORT */
114 #endif /* __ASSEMBLER__ */