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