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      1 // tls.h -- Thread-Local Storage utility routines for gold   -*- C++ -*-
      2 
      3 // Copyright (C) 2006-2014 Free Software Foundation, Inc.
      4 // Written by Ian Lance Taylor <iant (at) google.com>.
      5 
      6 // This file is part of gold.
      7 
      8 // This program is free software; you can redistribute it and/or modify
      9 // it under the terms of the GNU General Public License as published by
     10 // the Free Software Foundation; either version 3 of the License, or
     11 // (at your option) any later version.
     12 
     13 // This program is distributed in the hope that it will be useful,
     14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
     15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     16 // GNU General Public License for more details.
     17 
     18 // You should have received a copy of the GNU General Public License
     19 // along with this program; if not, write to the Free Software
     20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
     21 // MA 02110-1301, USA.
     22 
     23 #ifndef GOLD_TLS_H
     24 #define GOLD_TLS_H
     25 
     26 #include "elfcpp.h"
     27 #include "reloc.h"
     28 
     29 namespace gold
     30 {
     31 
     32 namespace tls
     33 {
     34 
     35 // This is used for relocations that can be converted to a different,
     36 // more efficient type of relocation.
     37 
     38 enum Tls_optimization
     39 {
     40   TLSOPT_NONE,    // Can not convert this relocation to a more efficient one.
     41   TLSOPT_TO_LD,   // Can convert General Dynamic to Local Dynamic.
     42   TLSOPT_TO_LE,   // Can convert GD or LD to Local-Exec.
     43   TLSOPT_TO_IE,   // Can convert GD or LD or LE to Initial-Exec.
     44 };
     45 
     46 // Check the range for a TLS relocation.  This is inlined for efficiency.
     47 
     48 template<int size, bool big_endian>
     49 inline void
     50 check_range(const Relocate_info<size, big_endian>* relinfo,
     51             size_t relnum,
     52             typename elfcpp::Elf_types<size>::Elf_Addr rel_offset,
     53             section_size_type view_size, int off)
     54 {
     55   typename elfcpp::Elf_types<size>::Elf_Addr offset = rel_offset + off;
     56   // Elf_Addr is unsigned, so this also tests for signed offset < 0.
     57   if (offset > view_size)
     58     gold_error_at_location(relinfo, relnum, rel_offset,
     59 			   _("TLS relocation out of range"));
     60 }
     61 
     62 // Check the validity of a TLS relocation.  This is like assert.
     63 
     64 template<int size, bool big_endian>
     65 inline void
     66 check_tls(const Relocate_info<size, big_endian>* relinfo,
     67           size_t relnum,
     68           typename elfcpp::Elf_types<size>::Elf_Addr rel_offset,
     69           bool valid)
     70 {
     71   if (!valid)
     72     gold_error_at_location(relinfo, relnum, rel_offset,
     73 			   _("TLS relocation against invalid instruction"));
     74 }
     75 
     76 
     77 } // End namespace tls.
     78 
     79 } // End namespace gold.
     80 
     81 #endif // !defined(GOLD_TLS_H)
     82