d1bddd3c4b
2014-05-02 Cary Coutant <ccoutant@google.com> * defstd.cc (in_segment): Define __ehdr_start here... * layout.cc (Layout::finalize): ...Instead of here. Set the output segment when known. * resolve.cc (Symbol::override_base_with_special): Remember the original binding. * symtab.cc (Symbol::set_output_segment): New function. (Symbol::set_undefined): New function. * symtab.h (Symbol::is_weak_undefined): Check original undef binding. (Symbol::is_strong_undefined): New function. (Symbol::set_output_segment): New function. (Symbol::set_undefined): New function. * target-reloc.h (is_strong_undefined): Remove. (issue_undefined_symbol_error): Call Symbol::is_weak_undefined. Check for hidden undefs. (relocate_section): Call Symbol::is_strong_undefined. * testsuite/Makefile.am (ehdr_start_test_1) (ehdr_start_test_2, ehdr_start_test_3) (ehdr_start_test_4, ehdr_start_test_5): New test cases. * testsuite/Makefile.in: Regenerate. * testsuite/ehdr_start_def.cc: New source file. * testsuite/ehdr_start_test.cc: New source file. * testsuite/ehdr_start_test.t: New linker script. * testsuite/ehdr_start_test_4.sh: New shell script.
288 lines
7.6 KiB
C++
288 lines
7.6 KiB
C++
// defstd.cc -- define standard symbols for gold.
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// Copyright (C) 2006-2014 Free Software Foundation, Inc.
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// Written by Ian Lance Taylor <iant@google.com>.
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// This file is part of gold.
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
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// This program 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
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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// MA 02110-1301, USA.
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#include "gold.h"
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#include "symtab.h"
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#include "layout.h"
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#include "defstd.h"
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// This is a simple file which defines the standard symbols like
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// "_end".
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namespace
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{
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using namespace gold;
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const Define_symbol_in_section in_section[] =
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{
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{
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"__preinit_array_start", // name
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".preinit_array", // output_section
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0, // value
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0, // size
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elfcpp::STT_NOTYPE, // type
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elfcpp::STB_GLOBAL, // binding
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elfcpp::STV_HIDDEN, // visibility
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0, // nonvis
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false, // offset_is_from_end
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true // only_if_ref
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},
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{
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"__preinit_array_end", // name
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".preinit_array", // output_section
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0, // value
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0, // size
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elfcpp::STT_NOTYPE, // type
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elfcpp::STB_GLOBAL, // binding
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elfcpp::STV_HIDDEN, // visibility
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0, // nonvis
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true, // offset_is_from_end
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true // only_if_ref
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},
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{
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"__init_array_start", // name
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".init_array", // output_section
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0, // value
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0, // size
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elfcpp::STT_NOTYPE, // type
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elfcpp::STB_GLOBAL, // binding
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elfcpp::STV_HIDDEN, // visibility
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0, // nonvis
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false, // offset_is_from_end
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true // only_if_ref
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},
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{
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"__init_array_end", // name
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".init_array", // output_section
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0, // value
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0, // size
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elfcpp::STT_NOTYPE, // type
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elfcpp::STB_GLOBAL, // binding
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elfcpp::STV_HIDDEN, // visibility
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0, // nonvis
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true, // offset_is_from_end
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true // only_if_ref
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},
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{
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"__fini_array_start", // name
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".fini_array", // output_section
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0, // value
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0, // size
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elfcpp::STT_NOTYPE, // type
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elfcpp::STB_GLOBAL, // binding
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elfcpp::STV_HIDDEN, // visibility
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0, // nonvis
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false, // offset_is_from_end
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true // only_if_ref
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},
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{
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"__fini_array_end", // name
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".fini_array", // output_section
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0, // value
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0, // size
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elfcpp::STT_NOTYPE, // type
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elfcpp::STB_GLOBAL, // binding
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elfcpp::STV_HIDDEN, // visibility
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0, // nonvis
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true, // offset_is_from_end
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true // only_if_ref
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},
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{
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"__stack", // name
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".stack", // output_section
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0, // value
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0, // size
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elfcpp::STT_NOTYPE, // type
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elfcpp::STB_GLOBAL, // binding
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elfcpp::STV_DEFAULT, // visibility
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0, // nonvis
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false, // offset_is_from_end
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true // only_if_ref
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},
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};
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const int in_section_count = sizeof in_section / sizeof in_section[0];
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const Define_symbol_in_segment in_segment[] =
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{
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{
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"__executable_start", // name
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elfcpp::PT_LOAD, // segment_type
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elfcpp::PF(0), // segment_flags_set
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elfcpp::PF(0), // segment_flags_clear
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0, // value
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0, // size
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elfcpp::STT_NOTYPE, // type
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elfcpp::STB_GLOBAL, // binding
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elfcpp::STV_DEFAULT, // visibility
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0, // nonvis
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Symbol::SEGMENT_START, // offset_from_base
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true // only_if_ref
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},
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{
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"__ehdr_start", // name
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elfcpp::PT_LOAD, // segment_type
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elfcpp::PF(0), // segment_flags_set
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elfcpp::PF(0), // segment_flags_clear
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0, // value
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0, // size
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elfcpp::STT_NOTYPE, // type
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elfcpp::STB_GLOBAL, // binding
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elfcpp::STV_HIDDEN, // visibility
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0, // nonvis
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Symbol::SEGMENT_START, // offset_from_base
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true // only_if_ref
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},
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{
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"etext", // name
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elfcpp::PT_LOAD, // segment_type
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elfcpp::PF_X, // segment_flags_set
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elfcpp::PF_W, // segment_flags_clear
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0, // value
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0, // size
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elfcpp::STT_NOTYPE, // type
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elfcpp::STB_GLOBAL, // binding
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elfcpp::STV_DEFAULT, // visibility
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0, // nonvis
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Symbol::SEGMENT_END, // offset_from_base
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true // only_if_ref
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},
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{
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"_etext", // name
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elfcpp::PT_LOAD, // segment_type
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elfcpp::PF_X, // segment_flags_set
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elfcpp::PF_W, // segment_flags_clear
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0, // value
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0, // size
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elfcpp::STT_NOTYPE, // type
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elfcpp::STB_GLOBAL, // binding
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elfcpp::STV_DEFAULT, // visibility
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0, // nonvis
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Symbol::SEGMENT_END, // offset_from_base
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true // only_if_ref
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},
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{
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"__etext", // name
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elfcpp::PT_LOAD, // segment_type
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elfcpp::PF_X, // segment_flags_set
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elfcpp::PF_W, // segment_flags_clear
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0, // value
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0, // size
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elfcpp::STT_NOTYPE, // type
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elfcpp::STB_GLOBAL, // binding
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elfcpp::STV_DEFAULT, // visibility
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0, // nonvis
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Symbol::SEGMENT_END, // offset_from_base
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true // only_if_ref
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},
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{
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"_edata", // name
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elfcpp::PT_LOAD, // segment_type
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elfcpp::PF_W, // segment_flags_set
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elfcpp::PF(0), // segment_flags_clear
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0, // value
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0, // size
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elfcpp::STT_NOTYPE, // type
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elfcpp::STB_GLOBAL, // binding
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elfcpp::STV_DEFAULT, // visibility
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0, // nonvis
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Symbol::SEGMENT_BSS, // offset_from_base
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false // only_if_ref
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},
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{
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"edata", // name
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elfcpp::PT_LOAD, // segment_type
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elfcpp::PF_W, // segment_flags_set
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elfcpp::PF(0), // segment_flags_clear
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0, // value
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0, // size
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elfcpp::STT_NOTYPE, // type
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elfcpp::STB_GLOBAL, // binding
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elfcpp::STV_DEFAULT, // visibility
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0, // nonvis
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Symbol::SEGMENT_BSS, // offset_from_base
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true // only_if_ref
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},
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{
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"__bss_start", // name
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elfcpp::PT_LOAD, // segment_type
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elfcpp::PF_W, // segment_flags_set
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elfcpp::PF(0), // segment_flags_clear
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0, // value
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0, // size
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elfcpp::STT_NOTYPE, // type
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elfcpp::STB_GLOBAL, // binding
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elfcpp::STV_DEFAULT, // visibility
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0, // nonvis
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Symbol::SEGMENT_BSS, // offset_from_base
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false // only_if_ref
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},
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{
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"_end", // name
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elfcpp::PT_LOAD, // segment_type
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elfcpp::PF_W, // segment_flags_set
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elfcpp::PF(0), // segment_flags_clear
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0, // value
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0, // size
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elfcpp::STT_NOTYPE, // type
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elfcpp::STB_GLOBAL, // binding
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elfcpp::STV_DEFAULT, // visibility
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0, // nonvis
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Symbol::SEGMENT_END, // offset_from_base
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false // only_if_ref
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},
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{
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"end", // name
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elfcpp::PT_LOAD, // segment_type
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elfcpp::PF_W, // segment_flags_set
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elfcpp::PF(0), // segment_flags_clear
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0, // value
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0, // size
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elfcpp::STT_NOTYPE, // type
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elfcpp::STB_GLOBAL, // binding
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elfcpp::STV_DEFAULT, // visibility
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0, // nonvis
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Symbol::SEGMENT_END, // offset_from_base
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true // only_if_ref
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}
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};
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const int in_segment_count = sizeof in_segment / sizeof in_segment[0];
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} // End anonymous namespace.
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namespace gold
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{
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void
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define_standard_symbols(Symbol_table* symtab, const Layout* layout)
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{
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bool saw_sections_clause = layout->script_options()->saw_sections_clause();
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symtab->define_symbols(layout, in_section_count, in_section,
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saw_sections_clause);
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symtab->define_symbols(layout, in_segment_count, in_segment,
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saw_sections_clause);
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}
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} // End namespace gold.
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