1 /* Thread-local storage handling in the ELF dynamic linker. s390 version.
2 Copyright (C) 2003, 2004, 2011 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/>. */
20 /* Type used for the representation of TLS information in the GOT. */
23 unsigned long int ti_module
;
24 unsigned long int ti_offset
;
29 /* This is the prototype for the GNU version. */
30 extern void *__tls_get_addr (tls_index
*ti
) attribute_hidden
;
31 extern unsigned long __tls_get_offset (unsigned long got_offset
);
34 /* The special thing about the s390 TLS ABI is that we do not have the
35 standard __tls_get_addr function but the __tls_get_offset function
36 which differs in two important aspects:
37 1) __tls_get_offset gets a got offset instead of a pointer to the
39 2) __tls_get_offset returns the offset of the requested variable to
40 the thread descriptor instead of a pointer to the variable.
45 .globl __tls_get_offset\n\
46 .type __tls_get_offset, @function\n\
52 # elif defined __s390__
55 .globl __tls_get_offset\n\
56 .type __tls_get_offset, @function\n\
60 0: la %r2,0(%r2,%r12)\n\
63 1: .long __tls_get_addr - 0b\n\
68 # define GET_ADDR_OFFSET \
69 (ti->ti_offset - (unsigned long) __builtin_thread_pointer ())
71 # define __TLS_GET_ADDR(__ti) \
72 ({ extern char _GLOBAL_OFFSET_TABLE_[] attribute_hidden; \
73 (void *) __tls_get_offset ((char *) (__ti) - _GLOBAL_OFFSET_TABLE_) \
74 + (unsigned long) __builtin_thread_pointer (); })
78 /* Value used for dtv entries for which the allocation is delayed. */
79 #define TLS_DTV_UNALLOCATED ((void *) -1l)