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glibc  2.9
dl-tls.h
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00001 /* Thread-local storage handling in the ELF dynamic linker.  i386 version.
00002    Copyright (C) 2002, 2004 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 
00021 /* Type used for the representation of TLS information in the GOT.  */
00022 typedef struct dl_tls_index
00023 {
00024   unsigned long int ti_module;
00025   unsigned long int ti_offset;
00026 } tls_index;
00027 
00028 
00029 #ifdef SHARED
00030 /* This is the prototype for the GNU version.  */
00031 extern void *___tls_get_addr (tls_index *ti)
00032      __attribute__ ((__regparm__ (1)));
00033 extern void *___tls_get_addr_internal (tls_index *ti)
00034      __attribute__ ((__regparm__ (1))) attribute_hidden;
00035 
00036 # ifdef IS_IN_rtld
00037 /* The special thing about the x86 TLS ABI is that we have two
00038    variants of the __tls_get_addr function with different calling
00039    conventions.  The GNU version, which we are mostly concerned here,
00040    takes the parameter in a register.  The name is changed by adding
00041    an additional underscore at the beginning.  The Sun version uses
00042    the normal calling convention.  */
00043 void *
00044 __tls_get_addr (tls_index *ti)
00045 {
00046   return ___tls_get_addr_internal (ti);
00047 }
00048 
00049 
00050 /* Prepare using the definition of __tls_get_addr in the generic
00051    version of this file.  */
00052 # define __tls_get_addr __attribute__ ((__regparm__ (1))) ___tls_get_addr
00053 strong_alias (___tls_get_addr, ___tls_get_addr_internal)
00054 #else
00055 
00056 /* Users should get the better interface.  */
00057 # define __tls_get_addr ___tls_get_addr
00058 
00059 # endif
00060 #endif