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/* Thread-local storage handling in the ELF dynamic linker. s390 version.
Copyright (C) 2003, 2004, 2011 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
/* Type used for the representation of TLS information in the GOT. */
typedef struct
{
unsigned long int ti_module;
unsigned long int ti_offset;
} tls_index;
#ifdef SHARED
/* This is the prototype for the GNU version. */
extern void *__tls_get_addr (tls_index *ti) attribute_hidden;
extern unsigned long __tls_get_offset (unsigned long got_offset);
# ifdef IS_IN_rtld
/* The special thing about the s390 TLS ABI is that we do not have the
standard __tls_get_addr function but the __tls_get_offset function
which differs in two important aspects:
1) __tls_get_offset gets a got offset instead of a pointer to the
tls_index structure
2) __tls_get_offset returns the offset of the requested variable to
the thread descriptor instead of a pointer to the variable.
*/
# ifdef __s390x__
asm("\n\
.text\n\
.globl __tls_get_offset\n\
.type __tls_get_offset, @function\n\
.align 4\n\
__tls_get_offset:\n\
la %r2,0(%r2,%r12)\n\
jg __tls_get_addr\n\
");
# elif defined __s390__
asm("\n\
.text\n\
.globl __tls_get_offset\n\
.type __tls_get_offset, @function\n\
.align 4\n\
__tls_get_offset:\n\
basr %r3,0\n\
0: la %r2,0(%r2,%r12)\n\
l %r4,1f-0b(%r3)\n\
b 0(%r4,%r3)\n\
1: .long __tls_get_addr - 0b\n\
");
# endif
# endif
# define GET_ADDR_OFFSET \
(ti->ti_offset - (unsigned long) __builtin_thread_pointer ())
# define __TLS_GET_ADDR(__ti) \
({ extern char _GLOBAL_OFFSET_TABLE_[] attribute_hidden; \
(void *) __tls_get_offset ((char *) (__ti) - _GLOBAL_OFFSET_TABLE_) \
+ (unsigned long) __builtin_thread_pointer (); })
#endif
/* Value used for dtv entries for which the allocation is delayed. */
#define TLS_DTV_UNALLOCATED ((void *) -1l)
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