1 /* Thread-local storage handling in the ELF dynamic linker. i386 version. 2 Copyright (C) 2002, 2004 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 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. 9 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. 14 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/>. */ 18 19 20 /* Type used for the representation of TLS information in the GOT. */ 21 typedef struct 22 { 23 unsigned long int ti_module; 24 unsigned long int ti_offset; 25 } tls_index; 26 27 28 extern void *__tls_get_addr (tls_index *ti); 29 30 #ifdef SHARED 31 /* This is the prototype for the GNU version. */ 32 extern void *___tls_get_addr (tls_index *ti) 33 __attribute__ ((__regparm__ (1))); 34 extern void *___tls_get_addr_internal (tls_index *ti) 35 __attribute__ ((__regparm__ (1))) attribute_hidden; 36 37 # ifdef IS_IN_rtld 38 /* The special thing about the x86 TLS ABI is that we have two 39 variants of the __tls_get_addr function with different calling 40 conventions. The GNU version, which we are mostly concerned here, 41 takes the parameter in a register. The name is changed by adding 42 an additional underscore at the beginning. The Sun version uses 43 the normal calling convention. */ 44 void * __tls_get_addr(tls_index * ti)45__tls_get_addr (tls_index *ti) 46 { 47 return ___tls_get_addr_internal (ti); 48 } 49 50 51 /* Prepare using the definition of __tls_get_addr in the generic 52 version of this file. */ 53 # define __tls_get_addr __attribute__ ((__regparm__ (1))) ___tls_get_addr 54 strong_alias (___tls_get_addr, ___tls_get_addr_internal) 55 #else 56 57 /* Users should get the better interface. */ 58 # define __tls_get_addr ___tls_get_addr 59 60 # endif 61 #endif 62 63 /* Value used for dtv entries for which the allocation is delayed. */ 64 #define TLS_DTV_UNALLOCATED ((void *) -1l) 65