4877 lines
144 KiB
C++
4877 lines
144 KiB
C++
// output.h -- manage the output file for gold -*- C++ -*-
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// Copyright (C) 2006-2015 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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#ifndef GOLD_OUTPUT_H
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#define GOLD_OUTPUT_H
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#include <list>
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#include <vector>
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#include "elfcpp.h"
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#include "mapfile.h"
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#include "layout.h"
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#include "reloc-types.h"
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namespace gold
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{
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class General_options;
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class Object;
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class Symbol;
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class Output_file;
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class Output_merge_base;
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class Output_section;
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class Relocatable_relocs;
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class Target;
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template<int size, bool big_endian>
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class Sized_target;
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template<int size, bool big_endian>
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class Sized_relobj;
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template<int size, bool big_endian>
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class Sized_relobj_file;
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// An abtract class for data which has to go into the output file.
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class Output_data
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{
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public:
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explicit Output_data()
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: address_(0), data_size_(0), offset_(-1),
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is_address_valid_(false), is_data_size_valid_(false),
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is_offset_valid_(false), is_data_size_fixed_(false),
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has_dynamic_reloc_(false)
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{ }
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virtual
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~Output_data();
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// Return the address. For allocated sections, this is only valid
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// after Layout::finalize is finished.
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uint64_t
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address() const
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{
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gold_assert(this->is_address_valid_);
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return this->address_;
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}
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// Return the size of the data. For allocated sections, this must
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// be valid after Layout::finalize calls set_address, but need not
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// be valid before then.
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off_t
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data_size() const
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{
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gold_assert(this->is_data_size_valid_);
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return this->data_size_;
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}
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// Get the current data size.
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off_t
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current_data_size() const
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{ return this->current_data_size_for_child(); }
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// Return true if data size is fixed.
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bool
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is_data_size_fixed() const
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{ return this->is_data_size_fixed_; }
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// Return the file offset. This is only valid after
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// Layout::finalize is finished. For some non-allocated sections,
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// it may not be valid until near the end of the link.
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off_t
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offset() const
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{
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gold_assert(this->is_offset_valid_);
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return this->offset_;
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}
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// Reset the address, file offset and data size. This essentially
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// disables the sanity testing about duplicate and unknown settings.
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void
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reset_address_and_file_offset()
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{
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this->is_address_valid_ = false;
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this->is_offset_valid_ = false;
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if (!this->is_data_size_fixed_)
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this->is_data_size_valid_ = false;
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this->do_reset_address_and_file_offset();
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}
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// As above, but just for data size.
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void
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reset_data_size()
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{
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if (!this->is_data_size_fixed_)
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this->is_data_size_valid_ = false;
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}
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// Return true if address and file offset already have reset values. In
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// other words, calling reset_address_and_file_offset will not change them.
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bool
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address_and_file_offset_have_reset_values() const
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{ return this->do_address_and_file_offset_have_reset_values(); }
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// Return the required alignment.
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uint64_t
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addralign() const
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{ return this->do_addralign(); }
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// Return whether this has a load address.
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bool
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has_load_address() const
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{ return this->do_has_load_address(); }
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// Return the load address.
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uint64_t
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load_address() const
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{ return this->do_load_address(); }
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// Return whether this is an Output_section.
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bool
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is_section() const
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{ return this->do_is_section(); }
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// Return whether this is an Output_section of the specified type.
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bool
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is_section_type(elfcpp::Elf_Word stt) const
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{ return this->do_is_section_type(stt); }
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// Return whether this is an Output_section with the specified flag
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// set.
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bool
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is_section_flag_set(elfcpp::Elf_Xword shf) const
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{ return this->do_is_section_flag_set(shf); }
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// Return the output section that this goes in, if there is one.
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Output_section*
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output_section()
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{ return this->do_output_section(); }
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const Output_section*
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output_section() const
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{ return this->do_output_section(); }
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// Return the output section index, if there is an output section.
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unsigned int
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out_shndx() const
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{ return this->do_out_shndx(); }
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// Set the output section index, if this is an output section.
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void
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set_out_shndx(unsigned int shndx)
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{ this->do_set_out_shndx(shndx); }
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// Set the address and file offset of this data, and finalize the
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// size of the data. This is called during Layout::finalize for
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// allocated sections.
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void
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set_address_and_file_offset(uint64_t addr, off_t off)
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{
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this->set_address(addr);
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this->set_file_offset(off);
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this->finalize_data_size();
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}
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// Set the address.
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void
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set_address(uint64_t addr)
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{
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gold_assert(!this->is_address_valid_);
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this->address_ = addr;
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this->is_address_valid_ = true;
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}
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// Set the file offset.
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void
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set_file_offset(off_t off)
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{
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gold_assert(!this->is_offset_valid_);
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this->offset_ = off;
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this->is_offset_valid_ = true;
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}
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// Update the data size without finalizing it.
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void
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pre_finalize_data_size()
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{
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if (!this->is_data_size_valid_)
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{
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// Tell the child class to update the data size.
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this->update_data_size();
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}
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}
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// Finalize the data size.
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void
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finalize_data_size()
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{
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if (!this->is_data_size_valid_)
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{
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// Tell the child class to set the data size.
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this->set_final_data_size();
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gold_assert(this->is_data_size_valid_);
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}
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}
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// Set the TLS offset. Called only for SHT_TLS sections.
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void
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set_tls_offset(uint64_t tls_base)
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{ this->do_set_tls_offset(tls_base); }
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// Return the TLS offset, relative to the base of the TLS segment.
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// Valid only for SHT_TLS sections.
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uint64_t
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tls_offset() const
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{ return this->do_tls_offset(); }
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// Write the data to the output file. This is called after
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// Layout::finalize is complete.
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void
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write(Output_file* file)
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{ this->do_write(file); }
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// This is called by Layout::finalize to note that the sizes of
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// allocated sections must now be fixed.
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static void
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layout_complete()
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{ Output_data::allocated_sizes_are_fixed = true; }
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// Used to check that layout has been done.
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static bool
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is_layout_complete()
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{ return Output_data::allocated_sizes_are_fixed; }
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// Note that a dynamic reloc has been applied to this data.
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void
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add_dynamic_reloc()
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{ this->has_dynamic_reloc_ = true; }
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// Return whether a dynamic reloc has been applied.
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bool
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has_dynamic_reloc() const
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{ return this->has_dynamic_reloc_; }
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// Whether the address is valid.
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bool
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is_address_valid() const
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{ return this->is_address_valid_; }
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// Whether the file offset is valid.
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bool
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is_offset_valid() const
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{ return this->is_offset_valid_; }
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// Whether the data size is valid.
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bool
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is_data_size_valid() const
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{ return this->is_data_size_valid_; }
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// Print information to the map file.
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void
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print_to_mapfile(Mapfile* mapfile) const
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{ return this->do_print_to_mapfile(mapfile); }
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protected:
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// Functions that child classes may or in some cases must implement.
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// Write the data to the output file.
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virtual void
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do_write(Output_file*) = 0;
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// Return the required alignment.
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virtual uint64_t
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do_addralign() const = 0;
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// Return whether this has a load address.
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virtual bool
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do_has_load_address() const
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{ return false; }
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// Return the load address.
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virtual uint64_t
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do_load_address() const
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{ gold_unreachable(); }
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// Return whether this is an Output_section.
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virtual bool
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do_is_section() const
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{ return false; }
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// Return whether this is an Output_section of the specified type.
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// This only needs to be implement by Output_section.
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virtual bool
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do_is_section_type(elfcpp::Elf_Word) const
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{ return false; }
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// Return whether this is an Output_section with the specific flag
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// set. This only needs to be implemented by Output_section.
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virtual bool
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do_is_section_flag_set(elfcpp::Elf_Xword) const
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{ return false; }
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// Return the output section, if there is one.
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virtual Output_section*
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do_output_section()
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{ return NULL; }
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virtual const Output_section*
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do_output_section() const
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{ return NULL; }
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// Return the output section index, if there is an output section.
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virtual unsigned int
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do_out_shndx() const
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{ gold_unreachable(); }
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// Set the output section index, if this is an output section.
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virtual void
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do_set_out_shndx(unsigned int)
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{ gold_unreachable(); }
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// This is a hook for derived classes to set the preliminary data size.
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// This is called by pre_finalize_data_size, normally called during
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// Layout::finalize, before the section address is set, and is used
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// during an incremental update, when we need to know the size of a
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// section before allocating space in the output file. For classes
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// where the current data size is up to date, this default version of
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// the method can be inherited.
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virtual void
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update_data_size()
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{ }
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// This is a hook for derived classes to set the data size. This is
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// called by finalize_data_size, normally called during
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// Layout::finalize, when the section address is set.
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virtual void
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set_final_data_size()
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{ gold_unreachable(); }
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// A hook for resetting the address and file offset.
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virtual void
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do_reset_address_and_file_offset()
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{ }
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// Return true if address and file offset already have reset values. In
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// other words, calling reset_address_and_file_offset will not change them.
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// A child class overriding do_reset_address_and_file_offset may need to
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// also override this.
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virtual bool
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do_address_and_file_offset_have_reset_values() const
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{ return !this->is_address_valid_ && !this->is_offset_valid_; }
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// Set the TLS offset. Called only for SHT_TLS sections.
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virtual void
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do_set_tls_offset(uint64_t)
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{ gold_unreachable(); }
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// Return the TLS offset, relative to the base of the TLS segment.
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// Valid only for SHT_TLS sections.
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virtual uint64_t
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do_tls_offset() const
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{ gold_unreachable(); }
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// Print to the map file. This only needs to be implemented by
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// classes which may appear in a PT_LOAD segment.
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virtual void
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do_print_to_mapfile(Mapfile*) const
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{ gold_unreachable(); }
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// Functions that child classes may call.
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// Reset the address. The Output_section class needs this when an
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// SHF_ALLOC input section is added to an output section which was
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// formerly not SHF_ALLOC.
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void
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mark_address_invalid()
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{ this->is_address_valid_ = false; }
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// Set the size of the data.
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void
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set_data_size(off_t data_size)
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{
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gold_assert(!this->is_data_size_valid_
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&& !this->is_data_size_fixed_);
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this->data_size_ = data_size;
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this->is_data_size_valid_ = true;
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}
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// Fix the data size. Once it is fixed, it cannot be changed
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// and the data size remains always valid.
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void
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fix_data_size()
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{
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gold_assert(this->is_data_size_valid_);
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this->is_data_size_fixed_ = true;
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}
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// Get the current data size--this is for the convenience of
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// sections which build up their size over time.
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off_t
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current_data_size_for_child() const
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{ return this->data_size_; }
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// Set the current data size--this is for the convenience of
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// sections which build up their size over time.
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void
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set_current_data_size_for_child(off_t data_size)
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{
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gold_assert(!this->is_data_size_valid_);
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this->data_size_ = data_size;
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}
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// Return default alignment for the target size.
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static uint64_t
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default_alignment();
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// Return default alignment for a specified size--32 or 64.
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static uint64_t
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default_alignment_for_size(int size);
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private:
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Output_data(const Output_data&);
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Output_data& operator=(const Output_data&);
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// This is used for verification, to make sure that we don't try to
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// change any sizes of allocated sections after we set the section
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// addresses.
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static bool allocated_sizes_are_fixed;
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// Memory address in output file.
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uint64_t address_;
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// Size of data in output file.
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off_t data_size_;
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// File offset of contents in output file.
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off_t offset_;
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// Whether address_ is valid.
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bool is_address_valid_ : 1;
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// Whether data_size_ is valid.
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bool is_data_size_valid_ : 1;
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// Whether offset_ is valid.
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bool is_offset_valid_ : 1;
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// Whether data size is fixed.
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bool is_data_size_fixed_ : 1;
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// Whether any dynamic relocs have been applied to this section.
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bool has_dynamic_reloc_ : 1;
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};
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// Output the section headers.
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class Output_section_headers : public Output_data
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{
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public:
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Output_section_headers(const Layout*,
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const Layout::Segment_list*,
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const Layout::Section_list*,
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const Layout::Section_list*,
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const Stringpool*,
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const Output_section*);
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protected:
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// Write the data to the file.
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void
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do_write(Output_file*);
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// Return the required alignment.
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uint64_t
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do_addralign() const
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{ return Output_data::default_alignment(); }
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// Write to a map file.
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void
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do_print_to_mapfile(Mapfile* mapfile) const
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{ mapfile->print_output_data(this, _("** section headers")); }
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// Update the data size.
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void
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update_data_size()
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{ this->set_data_size(this->do_size()); }
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// Set final data size.
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void
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set_final_data_size()
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{ this->set_data_size(this->do_size()); }
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private:
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// Write the data to the file with the right size and endianness.
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template<int size, bool big_endian>
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void
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do_sized_write(Output_file*);
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// Compute data size.
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off_t
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do_size() const;
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const Layout* layout_;
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const Layout::Segment_list* segment_list_;
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const Layout::Section_list* section_list_;
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const Layout::Section_list* unattached_section_list_;
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const Stringpool* secnamepool_;
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const Output_section* shstrtab_section_;
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};
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// Output the segment headers.
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class Output_segment_headers : public Output_data
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{
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public:
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Output_segment_headers(const Layout::Segment_list& segment_list);
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protected:
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// Write the data to the file.
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void
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do_write(Output_file*);
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// Return the required alignment.
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uint64_t
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do_addralign() const
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{ return Output_data::default_alignment(); }
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// Write to a map file.
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void
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do_print_to_mapfile(Mapfile* mapfile) const
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{ mapfile->print_output_data(this, _("** segment headers")); }
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// Set final data size.
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void
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set_final_data_size()
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{ this->set_data_size(this->do_size()); }
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private:
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// Write the data to the file with the right size and endianness.
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template<int size, bool big_endian>
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void
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do_sized_write(Output_file*);
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|
// Compute the current size.
|
|
off_t
|
|
do_size() const;
|
|
|
|
const Layout::Segment_list& segment_list_;
|
|
};
|
|
|
|
// Output the ELF file header.
|
|
|
|
class Output_file_header : public Output_data
|
|
{
|
|
public:
|
|
Output_file_header(Target*,
|
|
const Symbol_table*,
|
|
const Output_segment_headers*);
|
|
|
|
// Add information about the section headers. We lay out the ELF
|
|
// file header before we create the section headers.
|
|
void set_section_info(const Output_section_headers*,
|
|
const Output_section* shstrtab);
|
|
|
|
protected:
|
|
// Write the data to the file.
|
|
void
|
|
do_write(Output_file*);
|
|
|
|
// Return the required alignment.
|
|
uint64_t
|
|
do_addralign() const
|
|
{ return Output_data::default_alignment(); }
|
|
|
|
// Write to a map file.
|
|
void
|
|
do_print_to_mapfile(Mapfile* mapfile) const
|
|
{ mapfile->print_output_data(this, _("** file header")); }
|
|
|
|
// Set final data size.
|
|
void
|
|
set_final_data_size(void)
|
|
{ this->set_data_size(this->do_size()); }
|
|
|
|
private:
|
|
// Write the data to the file with the right size and endianness.
|
|
template<int size, bool big_endian>
|
|
void
|
|
do_sized_write(Output_file*);
|
|
|
|
// Return the value to use for the entry address.
|
|
template<int size>
|
|
typename elfcpp::Elf_types<size>::Elf_Addr
|
|
entry();
|
|
|
|
// Compute the current data size.
|
|
off_t
|
|
do_size() const;
|
|
|
|
Target* target_;
|
|
const Symbol_table* symtab_;
|
|
const Output_segment_headers* segment_header_;
|
|
const Output_section_headers* section_header_;
|
|
const Output_section* shstrtab_;
|
|
};
|
|
|
|
// Output sections are mainly comprised of input sections. However,
|
|
// there are cases where we have data to write out which is not in an
|
|
// input section. Output_section_data is used in such cases. This is
|
|
// an abstract base class.
|
|
|
|
class Output_section_data : public Output_data
|
|
{
|
|
public:
|
|
Output_section_data(off_t data_size, uint64_t addralign,
|
|
bool is_data_size_fixed)
|
|
: Output_data(), output_section_(NULL), addralign_(addralign)
|
|
{
|
|
this->set_data_size(data_size);
|
|
if (is_data_size_fixed)
|
|
this->fix_data_size();
|
|
}
|
|
|
|
Output_section_data(uint64_t addralign)
|
|
: Output_data(), output_section_(NULL), addralign_(addralign)
|
|
{ }
|
|
|
|
// Return the output section.
|
|
Output_section*
|
|
output_section()
|
|
{ return this->output_section_; }
|
|
|
|
const Output_section*
|
|
output_section() const
|
|
{ return this->output_section_; }
|
|
|
|
// Record the output section.
|
|
void
|
|
set_output_section(Output_section* os);
|
|
|
|
// Add an input section, for SHF_MERGE sections. This returns true
|
|
// if the section was handled.
|
|
bool
|
|
add_input_section(Relobj* object, unsigned int shndx)
|
|
{ return this->do_add_input_section(object, shndx); }
|
|
|
|
// Given an input OBJECT, an input section index SHNDX within that
|
|
// object, and an OFFSET relative to the start of that input
|
|
// section, return whether or not the corresponding offset within
|
|
// the output section is known. If this function returns true, it
|
|
// sets *POUTPUT to the output offset. The value -1 indicates that
|
|
// this input offset is being discarded.
|
|
bool
|
|
output_offset(const Relobj* object, unsigned int shndx,
|
|
section_offset_type offset,
|
|
section_offset_type* poutput) const
|
|
{ return this->do_output_offset(object, shndx, offset, poutput); }
|
|
|
|
// Write the contents to a buffer. This is used for sections which
|
|
// require postprocessing, such as compression.
|
|
void
|
|
write_to_buffer(unsigned char* buffer)
|
|
{ this->do_write_to_buffer(buffer); }
|
|
|
|
// Print merge stats to stderr. This should only be called for
|
|
// SHF_MERGE sections.
|
|
void
|
|
print_merge_stats(const char* section_name)
|
|
{ this->do_print_merge_stats(section_name); }
|
|
|
|
protected:
|
|
// The child class must implement do_write.
|
|
|
|
// The child class may implement specific adjustments to the output
|
|
// section.
|
|
virtual void
|
|
do_adjust_output_section(Output_section*)
|
|
{ }
|
|
|
|
// May be implemented by child class. Return true if the section
|
|
// was handled.
|
|
virtual bool
|
|
do_add_input_section(Relobj*, unsigned int)
|
|
{ gold_unreachable(); }
|
|
|
|
// The child class may implement output_offset.
|
|
virtual bool
|
|
do_output_offset(const Relobj*, unsigned int, section_offset_type,
|
|
section_offset_type*) const
|
|
{ return false; }
|
|
|
|
// The child class may implement write_to_buffer. Most child
|
|
// classes can not appear in a compressed section, and they do not
|
|
// implement this.
|
|
virtual void
|
|
do_write_to_buffer(unsigned char*)
|
|
{ gold_unreachable(); }
|
|
|
|
// Print merge statistics.
|
|
virtual void
|
|
do_print_merge_stats(const char*)
|
|
{ gold_unreachable(); }
|
|
|
|
// Return the required alignment.
|
|
uint64_t
|
|
do_addralign() const
|
|
{ return this->addralign_; }
|
|
|
|
// Return the output section.
|
|
Output_section*
|
|
do_output_section()
|
|
{ return this->output_section_; }
|
|
|
|
const Output_section*
|
|
do_output_section() const
|
|
{ return this->output_section_; }
|
|
|
|
// Return the section index of the output section.
|
|
unsigned int
|
|
do_out_shndx() const;
|
|
|
|
// Set the alignment.
|
|
void
|
|
set_addralign(uint64_t addralign);
|
|
|
|
private:
|
|
// The output section for this section.
|
|
Output_section* output_section_;
|
|
// The required alignment.
|
|
uint64_t addralign_;
|
|
};
|
|
|
|
// Some Output_section_data classes build up their data step by step,
|
|
// rather than all at once. This class provides an interface for
|
|
// them.
|
|
|
|
class Output_section_data_build : public Output_section_data
|
|
{
|
|
public:
|
|
Output_section_data_build(uint64_t addralign)
|
|
: Output_section_data(addralign)
|
|
{ }
|
|
|
|
Output_section_data_build(off_t data_size, uint64_t addralign)
|
|
: Output_section_data(data_size, addralign, false)
|
|
{ }
|
|
|
|
// Set the current data size.
|
|
void
|
|
set_current_data_size(off_t data_size)
|
|
{ this->set_current_data_size_for_child(data_size); }
|
|
|
|
protected:
|
|
// Set the final data size.
|
|
virtual void
|
|
set_final_data_size()
|
|
{ this->set_data_size(this->current_data_size_for_child()); }
|
|
};
|
|
|
|
// A simple case of Output_data in which we have constant data to
|
|
// output.
|
|
|
|
class Output_data_const : public Output_section_data
|
|
{
|
|
public:
|
|
Output_data_const(const std::string& data, uint64_t addralign)
|
|
: Output_section_data(data.size(), addralign, true), data_(data)
|
|
{ }
|
|
|
|
Output_data_const(const char* p, off_t len, uint64_t addralign)
|
|
: Output_section_data(len, addralign, true), data_(p, len)
|
|
{ }
|
|
|
|
Output_data_const(const unsigned char* p, off_t len, uint64_t addralign)
|
|
: Output_section_data(len, addralign, true),
|
|
data_(reinterpret_cast<const char*>(p), len)
|
|
{ }
|
|
|
|
protected:
|
|
// Write the data to the output file.
|
|
void
|
|
do_write(Output_file*);
|
|
|
|
// Write the data to a buffer.
|
|
void
|
|
do_write_to_buffer(unsigned char* buffer)
|
|
{ memcpy(buffer, this->data_.data(), this->data_.size()); }
|
|
|
|
// Write to a map file.
|
|
void
|
|
do_print_to_mapfile(Mapfile* mapfile) const
|
|
{ mapfile->print_output_data(this, _("** fill")); }
|
|
|
|
private:
|
|
std::string data_;
|
|
};
|
|
|
|
// Another version of Output_data with constant data, in which the
|
|
// buffer is allocated by the caller.
|
|
|
|
class Output_data_const_buffer : public Output_section_data
|
|
{
|
|
public:
|
|
Output_data_const_buffer(const unsigned char* p, off_t len,
|
|
uint64_t addralign, const char* map_name)
|
|
: Output_section_data(len, addralign, true),
|
|
p_(p), map_name_(map_name)
|
|
{ }
|
|
|
|
protected:
|
|
// Write the data the output file.
|
|
void
|
|
do_write(Output_file*);
|
|
|
|
// Write the data to a buffer.
|
|
void
|
|
do_write_to_buffer(unsigned char* buffer)
|
|
{ memcpy(buffer, this->p_, this->data_size()); }
|
|
|
|
// Write to a map file.
|
|
void
|
|
do_print_to_mapfile(Mapfile* mapfile) const
|
|
{ mapfile->print_output_data(this, _(this->map_name_)); }
|
|
|
|
private:
|
|
// The data to output.
|
|
const unsigned char* p_;
|
|
// Name to use in a map file. Maps are a rarely used feature, but
|
|
// the space usage is minor as aren't very many of these objects.
|
|
const char* map_name_;
|
|
};
|
|
|
|
// A place holder for a fixed amount of data written out via some
|
|
// other mechanism.
|
|
|
|
class Output_data_fixed_space : public Output_section_data
|
|
{
|
|
public:
|
|
Output_data_fixed_space(off_t data_size, uint64_t addralign,
|
|
const char* map_name)
|
|
: Output_section_data(data_size, addralign, true),
|
|
map_name_(map_name)
|
|
{ }
|
|
|
|
protected:
|
|
// Write out the data--the actual data must be written out
|
|
// elsewhere.
|
|
void
|
|
do_write(Output_file*)
|
|
{ }
|
|
|
|
// Write to a map file.
|
|
void
|
|
do_print_to_mapfile(Mapfile* mapfile) const
|
|
{ mapfile->print_output_data(this, _(this->map_name_)); }
|
|
|
|
private:
|
|
// Name to use in a map file. Maps are a rarely used feature, but
|
|
// the space usage is minor as aren't very many of these objects.
|
|
const char* map_name_;
|
|
};
|
|
|
|
// A place holder for variable sized data written out via some other
|
|
// mechanism.
|
|
|
|
class Output_data_space : public Output_section_data_build
|
|
{
|
|
public:
|
|
explicit Output_data_space(uint64_t addralign, const char* map_name)
|
|
: Output_section_data_build(addralign),
|
|
map_name_(map_name)
|
|
{ }
|
|
|
|
explicit Output_data_space(off_t data_size, uint64_t addralign,
|
|
const char* map_name)
|
|
: Output_section_data_build(data_size, addralign),
|
|
map_name_(map_name)
|
|
{ }
|
|
|
|
// Set the alignment.
|
|
void
|
|
set_space_alignment(uint64_t align)
|
|
{ this->set_addralign(align); }
|
|
|
|
protected:
|
|
// Write out the data--the actual data must be written out
|
|
// elsewhere.
|
|
void
|
|
do_write(Output_file*)
|
|
{ }
|
|
|
|
// Write to a map file.
|
|
void
|
|
do_print_to_mapfile(Mapfile* mapfile) const
|
|
{ mapfile->print_output_data(this, _(this->map_name_)); }
|
|
|
|
private:
|
|
// Name to use in a map file. Maps are a rarely used feature, but
|
|
// the space usage is minor as aren't very many of these objects.
|
|
const char* map_name_;
|
|
};
|
|
|
|
// Fill fixed space with zeroes. This is just like
|
|
// Output_data_fixed_space, except that the map name is known.
|
|
|
|
class Output_data_zero_fill : public Output_section_data
|
|
{
|
|
public:
|
|
Output_data_zero_fill(off_t data_size, uint64_t addralign)
|
|
: Output_section_data(data_size, addralign, true)
|
|
{ }
|
|
|
|
protected:
|
|
// There is no data to write out.
|
|
void
|
|
do_write(Output_file*)
|
|
{ }
|
|
|
|
// Write to a map file.
|
|
void
|
|
do_print_to_mapfile(Mapfile* mapfile) const
|
|
{ mapfile->print_output_data(this, "** zero fill"); }
|
|
};
|
|
|
|
// A string table which goes into an output section.
|
|
|
|
class Output_data_strtab : public Output_section_data
|
|
{
|
|
public:
|
|
Output_data_strtab(Stringpool* strtab)
|
|
: Output_section_data(1), strtab_(strtab)
|
|
{ }
|
|
|
|
protected:
|
|
// This is called to update the section size prior to assigning
|
|
// the address and file offset.
|
|
void
|
|
update_data_size()
|
|
{ this->set_final_data_size(); }
|
|
|
|
// This is called to set the address and file offset. Here we make
|
|
// sure that the Stringpool is finalized.
|
|
void
|
|
set_final_data_size();
|
|
|
|
// Write out the data.
|
|
void
|
|
do_write(Output_file*);
|
|
|
|
// Write the data to a buffer.
|
|
void
|
|
do_write_to_buffer(unsigned char* buffer)
|
|
{ this->strtab_->write_to_buffer(buffer, this->data_size()); }
|
|
|
|
// Write to a map file.
|
|
void
|
|
do_print_to_mapfile(Mapfile* mapfile) const
|
|
{ mapfile->print_output_data(this, _("** string table")); }
|
|
|
|
private:
|
|
Stringpool* strtab_;
|
|
};
|
|
|
|
// This POD class is used to represent a single reloc in the output
|
|
// file. This could be a private class within Output_data_reloc, but
|
|
// the templatization is complex enough that I broke it out into a
|
|
// separate class. The class is templatized on either elfcpp::SHT_REL
|
|
// or elfcpp::SHT_RELA, and also on whether this is a dynamic
|
|
// relocation or an ordinary relocation.
|
|
|
|
// A relocation can be against a global symbol, a local symbol, a
|
|
// local section symbol, an output section, or the undefined symbol at
|
|
// index 0. We represent the latter by using a NULL global symbol.
|
|
|
|
template<int sh_type, bool dynamic, int size, bool big_endian>
|
|
class Output_reloc;
|
|
|
|
template<bool dynamic, int size, bool big_endian>
|
|
class Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>
|
|
{
|
|
public:
|
|
typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
|
|
typedef typename elfcpp::Elf_types<size>::Elf_Addr Addend;
|
|
|
|
static const Address invalid_address = static_cast<Address>(0) - 1;
|
|
|
|
// An uninitialized entry. We need this because we want to put
|
|
// instances of this class into an STL container.
|
|
Output_reloc()
|
|
: local_sym_index_(INVALID_CODE)
|
|
{ }
|
|
|
|
// We have a bunch of different constructors. They come in pairs
|
|
// depending on how the address of the relocation is specified. It
|
|
// can either be an offset in an Output_data or an offset in an
|
|
// input section.
|
|
|
|
// A reloc against a global symbol.
|
|
|
|
Output_reloc(Symbol* gsym, unsigned int type, Output_data* od,
|
|
Address address, bool is_relative, bool is_symbolless,
|
|
bool use_plt_offset);
|
|
|
|
Output_reloc(Symbol* gsym, unsigned int type,
|
|
Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int shndx, Address address, bool is_relative,
|
|
bool is_symbolless, bool use_plt_offset);
|
|
|
|
// A reloc against a local symbol or local section symbol.
|
|
|
|
Output_reloc(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int local_sym_index, unsigned int type,
|
|
Output_data* od, Address address, bool is_relative,
|
|
bool is_symbolless, bool is_section_symbol,
|
|
bool use_plt_offset);
|
|
|
|
Output_reloc(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int local_sym_index, unsigned int type,
|
|
unsigned int shndx, Address address, bool is_relative,
|
|
bool is_symbolless, bool is_section_symbol,
|
|
bool use_plt_offset);
|
|
|
|
// A reloc against the STT_SECTION symbol of an output section.
|
|
|
|
Output_reloc(Output_section* os, unsigned int type, Output_data* od,
|
|
Address address, bool is_relative);
|
|
|
|
Output_reloc(Output_section* os, unsigned int type,
|
|
Sized_relobj<size, big_endian>* relobj, unsigned int shndx,
|
|
Address address, bool is_relative);
|
|
|
|
// An absolute or relative relocation with no symbol.
|
|
|
|
Output_reloc(unsigned int type, Output_data* od, Address address,
|
|
bool is_relative);
|
|
|
|
Output_reloc(unsigned int type, Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int shndx, Address address, bool is_relative);
|
|
|
|
// A target specific relocation. The target will be called to get
|
|
// the symbol index, passing ARG. The type and offset will be set
|
|
// as for other relocation types.
|
|
|
|
Output_reloc(unsigned int type, void* arg, Output_data* od,
|
|
Address address);
|
|
|
|
Output_reloc(unsigned int type, void* arg,
|
|
Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int shndx, Address address);
|
|
|
|
// Return the reloc type.
|
|
unsigned int
|
|
type() const
|
|
{ return this->type_; }
|
|
|
|
// Return whether this is a RELATIVE relocation.
|
|
bool
|
|
is_relative() const
|
|
{ return this->is_relative_; }
|
|
|
|
// Return whether this is a relocation which should not use
|
|
// a symbol, but which obtains its addend from a symbol.
|
|
bool
|
|
is_symbolless() const
|
|
{ return this->is_symbolless_; }
|
|
|
|
// Return whether this is against a local section symbol.
|
|
bool
|
|
is_local_section_symbol() const
|
|
{
|
|
return (this->local_sym_index_ != GSYM_CODE
|
|
&& this->local_sym_index_ != SECTION_CODE
|
|
&& this->local_sym_index_ != INVALID_CODE
|
|
&& this->local_sym_index_ != TARGET_CODE
|
|
&& this->is_section_symbol_);
|
|
}
|
|
|
|
// Return whether this is a target specific relocation.
|
|
bool
|
|
is_target_specific() const
|
|
{ return this->local_sym_index_ == TARGET_CODE; }
|
|
|
|
// Return the argument to pass to the target for a target specific
|
|
// relocation.
|
|
void*
|
|
target_arg() const
|
|
{
|
|
gold_assert(this->local_sym_index_ == TARGET_CODE);
|
|
return this->u1_.arg;
|
|
}
|
|
|
|
// For a local section symbol, return the offset of the input
|
|
// section within the output section. ADDEND is the addend being
|
|
// applied to the input section.
|
|
Address
|
|
local_section_offset(Addend addend) const;
|
|
|
|
// Get the value of the symbol referred to by a Rel relocation when
|
|
// we are adding the given ADDEND.
|
|
Address
|
|
symbol_value(Addend addend) const;
|
|
|
|
// If this relocation is against an input section, return the
|
|
// relocatable object containing the input section.
|
|
Sized_relobj<size, big_endian>*
|
|
get_relobj() const
|
|
{
|
|
if (this->shndx_ == INVALID_CODE)
|
|
return NULL;
|
|
return this->u2_.relobj;
|
|
}
|
|
|
|
// Write the reloc entry to an output view.
|
|
void
|
|
write(unsigned char* pov) const;
|
|
|
|
// Write the offset and info fields to Write_rel.
|
|
template<typename Write_rel>
|
|
void write_rel(Write_rel*) const;
|
|
|
|
// This is used when sorting dynamic relocs. Return -1 to sort this
|
|
// reloc before R2, 0 to sort the same as R2, 1 to sort after R2.
|
|
int
|
|
compare(const Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>& r2)
|
|
const;
|
|
|
|
// Return whether this reloc should be sorted before the argument
|
|
// when sorting dynamic relocs.
|
|
bool
|
|
sort_before(const Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>&
|
|
r2) const
|
|
{ return this->compare(r2) < 0; }
|
|
|
|
private:
|
|
// Record that we need a dynamic symbol index.
|
|
void
|
|
set_needs_dynsym_index();
|
|
|
|
// Return the symbol index.
|
|
unsigned int
|
|
get_symbol_index() const;
|
|
|
|
// Return the output address.
|
|
Address
|
|
get_address() const;
|
|
|
|
// Codes for local_sym_index_.
|
|
enum
|
|
{
|
|
// Global symbol.
|
|
GSYM_CODE = -1U,
|
|
// Output section.
|
|
SECTION_CODE = -2U,
|
|
// Target specific.
|
|
TARGET_CODE = -3U,
|
|
// Invalid uninitialized entry.
|
|
INVALID_CODE = -4U
|
|
};
|
|
|
|
union
|
|
{
|
|
// For a local symbol or local section symbol
|
|
// (this->local_sym_index_ >= 0), the object. We will never
|
|
// generate a relocation against a local symbol in a dynamic
|
|
// object; that doesn't make sense. And our callers will always
|
|
// be templatized, so we use Sized_relobj here.
|
|
Sized_relobj<size, big_endian>* relobj;
|
|
// For a global symbol (this->local_sym_index_ == GSYM_CODE, the
|
|
// symbol. If this is NULL, it indicates a relocation against the
|
|
// undefined 0 symbol.
|
|
Symbol* gsym;
|
|
// For a relocation against an output section
|
|
// (this->local_sym_index_ == SECTION_CODE), the output section.
|
|
Output_section* os;
|
|
// For a target specific relocation, an argument to pass to the
|
|
// target.
|
|
void* arg;
|
|
} u1_;
|
|
union
|
|
{
|
|
// If this->shndx_ is not INVALID CODE, the object which holds the
|
|
// input section being used to specify the reloc address.
|
|
Sized_relobj<size, big_endian>* relobj;
|
|
// If this->shndx_ is INVALID_CODE, the output data being used to
|
|
// specify the reloc address. This may be NULL if the reloc
|
|
// address is absolute.
|
|
Output_data* od;
|
|
} u2_;
|
|
// The address offset within the input section or the Output_data.
|
|
Address address_;
|
|
// This is GSYM_CODE for a global symbol, or SECTION_CODE for a
|
|
// relocation against an output section, or TARGET_CODE for a target
|
|
// specific relocation, or INVALID_CODE for an uninitialized value.
|
|
// Otherwise, for a local symbol (this->is_section_symbol_ is
|
|
// false), the local symbol index. For a local section symbol
|
|
// (this->is_section_symbol_ is true), the section index in the
|
|
// input file.
|
|
unsigned int local_sym_index_;
|
|
// The reloc type--a processor specific code.
|
|
unsigned int type_ : 28;
|
|
// True if the relocation is a RELATIVE relocation.
|
|
bool is_relative_ : 1;
|
|
// True if the relocation is one which should not use
|
|
// a symbol, but which obtains its addend from a symbol.
|
|
bool is_symbolless_ : 1;
|
|
// True if the relocation is against a section symbol.
|
|
bool is_section_symbol_ : 1;
|
|
// True if the addend should be the PLT offset.
|
|
// (Used only for RELA, but stored here for space.)
|
|
bool use_plt_offset_ : 1;
|
|
// If the reloc address is an input section in an object, the
|
|
// section index. This is INVALID_CODE if the reloc address is
|
|
// specified in some other way.
|
|
unsigned int shndx_;
|
|
};
|
|
|
|
// The SHT_RELA version of Output_reloc<>. This is just derived from
|
|
// the SHT_REL version of Output_reloc, but it adds an addend.
|
|
|
|
template<bool dynamic, int size, bool big_endian>
|
|
class Output_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian>
|
|
{
|
|
public:
|
|
typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
|
|
typedef typename elfcpp::Elf_types<size>::Elf_Addr Addend;
|
|
|
|
// An uninitialized entry.
|
|
Output_reloc()
|
|
: rel_()
|
|
{ }
|
|
|
|
// A reloc against a global symbol.
|
|
|
|
Output_reloc(Symbol* gsym, unsigned int type, Output_data* od,
|
|
Address address, Addend addend, bool is_relative,
|
|
bool is_symbolless, bool use_plt_offset)
|
|
: rel_(gsym, type, od, address, is_relative, is_symbolless,
|
|
use_plt_offset),
|
|
addend_(addend)
|
|
{ }
|
|
|
|
Output_reloc(Symbol* gsym, unsigned int type,
|
|
Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int shndx, Address address, Addend addend,
|
|
bool is_relative, bool is_symbolless, bool use_plt_offset)
|
|
: rel_(gsym, type, relobj, shndx, address, is_relative,
|
|
is_symbolless, use_plt_offset), addend_(addend)
|
|
{ }
|
|
|
|
// A reloc against a local symbol.
|
|
|
|
Output_reloc(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int local_sym_index, unsigned int type,
|
|
Output_data* od, Address address,
|
|
Addend addend, bool is_relative,
|
|
bool is_symbolless, bool is_section_symbol,
|
|
bool use_plt_offset)
|
|
: rel_(relobj, local_sym_index, type, od, address, is_relative,
|
|
is_symbolless, is_section_symbol, use_plt_offset),
|
|
addend_(addend)
|
|
{ }
|
|
|
|
Output_reloc(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int local_sym_index, unsigned int type,
|
|
unsigned int shndx, Address address,
|
|
Addend addend, bool is_relative,
|
|
bool is_symbolless, bool is_section_symbol,
|
|
bool use_plt_offset)
|
|
: rel_(relobj, local_sym_index, type, shndx, address, is_relative,
|
|
is_symbolless, is_section_symbol, use_plt_offset),
|
|
addend_(addend)
|
|
{ }
|
|
|
|
// A reloc against the STT_SECTION symbol of an output section.
|
|
|
|
Output_reloc(Output_section* os, unsigned int type, Output_data* od,
|
|
Address address, Addend addend, bool is_relative)
|
|
: rel_(os, type, od, address, is_relative), addend_(addend)
|
|
{ }
|
|
|
|
Output_reloc(Output_section* os, unsigned int type,
|
|
Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int shndx, Address address, Addend addend,
|
|
bool is_relative)
|
|
: rel_(os, type, relobj, shndx, address, is_relative), addend_(addend)
|
|
{ }
|
|
|
|
// An absolute or relative relocation with no symbol.
|
|
|
|
Output_reloc(unsigned int type, Output_data* od, Address address,
|
|
Addend addend, bool is_relative)
|
|
: rel_(type, od, address, is_relative), addend_(addend)
|
|
{ }
|
|
|
|
Output_reloc(unsigned int type, Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int shndx, Address address, Addend addend,
|
|
bool is_relative)
|
|
: rel_(type, relobj, shndx, address, is_relative), addend_(addend)
|
|
{ }
|
|
|
|
// A target specific relocation. The target will be called to get
|
|
// the symbol index and the addend, passing ARG. The type and
|
|
// offset will be set as for other relocation types.
|
|
|
|
Output_reloc(unsigned int type, void* arg, Output_data* od,
|
|
Address address, Addend addend)
|
|
: rel_(type, arg, od, address), addend_(addend)
|
|
{ }
|
|
|
|
Output_reloc(unsigned int type, void* arg,
|
|
Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int shndx, Address address, Addend addend)
|
|
: rel_(type, arg, relobj, shndx, address), addend_(addend)
|
|
{ }
|
|
|
|
// Return whether this is a RELATIVE relocation.
|
|
bool
|
|
is_relative() const
|
|
{ return this->rel_.is_relative(); }
|
|
|
|
// Return whether this is a relocation which should not use
|
|
// a symbol, but which obtains its addend from a symbol.
|
|
bool
|
|
is_symbolless() const
|
|
{ return this->rel_.is_symbolless(); }
|
|
|
|
// If this relocation is against an input section, return the
|
|
// relocatable object containing the input section.
|
|
Sized_relobj<size, big_endian>*
|
|
get_relobj() const
|
|
{ return this->rel_.get_relobj(); }
|
|
|
|
// Write the reloc entry to an output view.
|
|
void
|
|
write(unsigned char* pov) const;
|
|
|
|
// Return whether this reloc should be sorted before the argument
|
|
// when sorting dynamic relocs.
|
|
bool
|
|
sort_before(const Output_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian>&
|
|
r2) const
|
|
{
|
|
int i = this->rel_.compare(r2.rel_);
|
|
if (i < 0)
|
|
return true;
|
|
else if (i > 0)
|
|
return false;
|
|
else
|
|
return this->addend_ < r2.addend_;
|
|
}
|
|
|
|
private:
|
|
// The basic reloc.
|
|
Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian> rel_;
|
|
// The addend.
|
|
Addend addend_;
|
|
};
|
|
|
|
// Output_data_reloc_generic is a non-template base class for
|
|
// Output_data_reloc_base. This gives the generic code a way to hold
|
|
// a pointer to a reloc section.
|
|
|
|
class Output_data_reloc_generic : public Output_section_data_build
|
|
{
|
|
public:
|
|
Output_data_reloc_generic(int size, bool sort_relocs)
|
|
: Output_section_data_build(Output_data::default_alignment_for_size(size)),
|
|
relative_reloc_count_(0), sort_relocs_(sort_relocs)
|
|
{ }
|
|
|
|
// Return the number of relative relocs in this section.
|
|
size_t
|
|
relative_reloc_count() const
|
|
{ return this->relative_reloc_count_; }
|
|
|
|
// Whether we should sort the relocs.
|
|
bool
|
|
sort_relocs() const
|
|
{ return this->sort_relocs_; }
|
|
|
|
// Add a reloc of type TYPE against the global symbol GSYM. The
|
|
// relocation applies to the data at offset ADDRESS within OD.
|
|
virtual void
|
|
add_global_generic(Symbol* gsym, unsigned int type, Output_data* od,
|
|
uint64_t address, uint64_t addend) = 0;
|
|
|
|
// Add a reloc of type TYPE against the global symbol GSYM. The
|
|
// relocation applies to data at offset ADDRESS within section SHNDX
|
|
// of object file RELOBJ. OD is the associated output section.
|
|
virtual void
|
|
add_global_generic(Symbol* gsym, unsigned int type, Output_data* od,
|
|
Relobj* relobj, unsigned int shndx, uint64_t address,
|
|
uint64_t addend) = 0;
|
|
|
|
// Add a reloc of type TYPE against the local symbol LOCAL_SYM_INDEX
|
|
// in RELOBJ. The relocation applies to the data at offset ADDRESS
|
|
// within OD.
|
|
virtual void
|
|
add_local_generic(Relobj* relobj, unsigned int local_sym_index,
|
|
unsigned int type, Output_data* od, uint64_t address,
|
|
uint64_t addend) = 0;
|
|
|
|
// Add a reloc of type TYPE against the local symbol LOCAL_SYM_INDEX
|
|
// in RELOBJ. The relocation applies to the data at offset ADDRESS
|
|
// within section SHNDX of RELOBJ. OD is the associated output
|
|
// section.
|
|
virtual void
|
|
add_local_generic(Relobj* relobj, unsigned int local_sym_index,
|
|
unsigned int type, Output_data* od, unsigned int shndx,
|
|
uint64_t address, uint64_t addend) = 0;
|
|
|
|
// Add a reloc of type TYPE against the STT_SECTION symbol of the
|
|
// output section OS. The relocation applies to the data at offset
|
|
// ADDRESS within OD.
|
|
virtual void
|
|
add_output_section_generic(Output_section *os, unsigned int type,
|
|
Output_data* od, uint64_t address,
|
|
uint64_t addend) = 0;
|
|
|
|
// Add a reloc of type TYPE against the STT_SECTION symbol of the
|
|
// output section OS. The relocation applies to the data at offset
|
|
// ADDRESS within section SHNDX of RELOBJ. OD is the associated
|
|
// output section.
|
|
virtual void
|
|
add_output_section_generic(Output_section* os, unsigned int type,
|
|
Output_data* od, Relobj* relobj,
|
|
unsigned int shndx, uint64_t address,
|
|
uint64_t addend) = 0;
|
|
|
|
protected:
|
|
// Note that we've added another relative reloc.
|
|
void
|
|
bump_relative_reloc_count()
|
|
{ ++this->relative_reloc_count_; }
|
|
|
|
private:
|
|
// The number of relative relocs added to this section. This is to
|
|
// support DT_RELCOUNT.
|
|
size_t relative_reloc_count_;
|
|
// Whether to sort the relocations when writing them out, to make
|
|
// the dynamic linker more efficient.
|
|
bool sort_relocs_;
|
|
};
|
|
|
|
// Output_data_reloc is used to manage a section containing relocs.
|
|
// SH_TYPE is either elfcpp::SHT_REL or elfcpp::SHT_RELA. DYNAMIC
|
|
// indicates whether this is a dynamic relocation or a normal
|
|
// relocation. Output_data_reloc_base is a base class.
|
|
// Output_data_reloc is the real class, which we specialize based on
|
|
// the reloc type.
|
|
|
|
template<int sh_type, bool dynamic, int size, bool big_endian>
|
|
class Output_data_reloc_base : public Output_data_reloc_generic
|
|
{
|
|
public:
|
|
typedef Output_reloc<sh_type, dynamic, size, big_endian> Output_reloc_type;
|
|
typedef typename Output_reloc_type::Address Address;
|
|
static const int reloc_size =
|
|
Reloc_types<sh_type, size, big_endian>::reloc_size;
|
|
|
|
// Construct the section.
|
|
Output_data_reloc_base(bool sort_relocs)
|
|
: Output_data_reloc_generic(size, sort_relocs)
|
|
{ }
|
|
|
|
protected:
|
|
// Write out the data.
|
|
void
|
|
do_write(Output_file*);
|
|
|
|
// Set the entry size and the link.
|
|
void
|
|
do_adjust_output_section(Output_section* os);
|
|
|
|
// Write to a map file.
|
|
void
|
|
do_print_to_mapfile(Mapfile* mapfile) const
|
|
{
|
|
mapfile->print_output_data(this,
|
|
(dynamic
|
|
? _("** dynamic relocs")
|
|
: _("** relocs")));
|
|
}
|
|
|
|
// Add a relocation entry.
|
|
void
|
|
add(Output_data* od, const Output_reloc_type& reloc)
|
|
{
|
|
this->relocs_.push_back(reloc);
|
|
this->set_current_data_size(this->relocs_.size() * reloc_size);
|
|
if (dynamic)
|
|
od->add_dynamic_reloc();
|
|
if (reloc.is_relative())
|
|
this->bump_relative_reloc_count();
|
|
Sized_relobj<size, big_endian>* relobj = reloc.get_relobj();
|
|
if (relobj != NULL)
|
|
relobj->add_dyn_reloc(this->relocs_.size() - 1);
|
|
}
|
|
|
|
private:
|
|
typedef std::vector<Output_reloc_type> Relocs;
|
|
|
|
// The class used to sort the relocations.
|
|
struct Sort_relocs_comparison
|
|
{
|
|
bool
|
|
operator()(const Output_reloc_type& r1, const Output_reloc_type& r2) const
|
|
{ return r1.sort_before(r2); }
|
|
};
|
|
|
|
// The relocations in this section.
|
|
Relocs relocs_;
|
|
};
|
|
|
|
// The class which callers actually create.
|
|
|
|
template<int sh_type, bool dynamic, int size, bool big_endian>
|
|
class Output_data_reloc;
|
|
|
|
// The SHT_REL version of Output_data_reloc.
|
|
|
|
template<bool dynamic, int size, bool big_endian>
|
|
class Output_data_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>
|
|
: public Output_data_reloc_base<elfcpp::SHT_REL, dynamic, size, big_endian>
|
|
{
|
|
private:
|
|
typedef Output_data_reloc_base<elfcpp::SHT_REL, dynamic, size,
|
|
big_endian> Base;
|
|
|
|
public:
|
|
typedef typename Base::Output_reloc_type Output_reloc_type;
|
|
typedef typename Output_reloc_type::Address Address;
|
|
|
|
Output_data_reloc(bool sr)
|
|
: Output_data_reloc_base<elfcpp::SHT_REL, dynamic, size, big_endian>(sr)
|
|
{ }
|
|
|
|
// Add a reloc against a global symbol.
|
|
|
|
void
|
|
add_global(Symbol* gsym, unsigned int type, Output_data* od, Address address)
|
|
{
|
|
this->add(od, Output_reloc_type(gsym, type, od, address,
|
|
false, false, false));
|
|
}
|
|
|
|
void
|
|
add_global(Symbol* gsym, unsigned int type, Output_data* od,
|
|
Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int shndx, Address address)
|
|
{
|
|
this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
|
|
false, false, false));
|
|
}
|
|
|
|
void
|
|
add_global_generic(Symbol* gsym, unsigned int type, Output_data* od,
|
|
uint64_t address, uint64_t addend)
|
|
{
|
|
gold_assert(addend == 0);
|
|
this->add(od, Output_reloc_type(gsym, type, od,
|
|
convert_types<Address, uint64_t>(address),
|
|
false, false, false));
|
|
}
|
|
|
|
void
|
|
add_global_generic(Symbol* gsym, unsigned int type, Output_data* od,
|
|
Relobj* relobj, unsigned int shndx, uint64_t address,
|
|
uint64_t addend)
|
|
{
|
|
gold_assert(addend == 0);
|
|
Sized_relobj<size, big_endian>* sized_relobj =
|
|
static_cast<Sized_relobj<size, big_endian>*>(relobj);
|
|
this->add(od, Output_reloc_type(gsym, type, sized_relobj, shndx,
|
|
convert_types<Address, uint64_t>(address),
|
|
false, false, false));
|
|
}
|
|
|
|
// Add a RELATIVE reloc against a global symbol. The final relocation
|
|
// will not reference the symbol.
|
|
|
|
void
|
|
add_global_relative(Symbol* gsym, unsigned int type, Output_data* od,
|
|
Address address)
|
|
{
|
|
this->add(od, Output_reloc_type(gsym, type, od, address, true, true,
|
|
false));
|
|
}
|
|
|
|
void
|
|
add_global_relative(Symbol* gsym, unsigned int type, Output_data* od,
|
|
Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int shndx, Address address)
|
|
{
|
|
this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
|
|
true, true, false));
|
|
}
|
|
|
|
// Add a global relocation which does not use a symbol for the relocation,
|
|
// but which gets its addend from a symbol.
|
|
|
|
void
|
|
add_symbolless_global_addend(Symbol* gsym, unsigned int type,
|
|
Output_data* od, Address address)
|
|
{
|
|
this->add(od, Output_reloc_type(gsym, type, od, address, false, true,
|
|
false));
|
|
}
|
|
|
|
void
|
|
add_symbolless_global_addend(Symbol* gsym, unsigned int type,
|
|
Output_data* od,
|
|
Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int shndx, Address address)
|
|
{
|
|
this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
|
|
false, true, false));
|
|
}
|
|
|
|
// Add a reloc against a local symbol.
|
|
|
|
void
|
|
add_local(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int local_sym_index, unsigned int type,
|
|
Output_data* od, Address address)
|
|
{
|
|
this->add(od, Output_reloc_type(relobj, local_sym_index, type, od,
|
|
address, false, false, false, false));
|
|
}
|
|
|
|
void
|
|
add_local(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int local_sym_index, unsigned int type,
|
|
Output_data* od, unsigned int shndx, Address address)
|
|
{
|
|
this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
|
|
address, false, false, false, false));
|
|
}
|
|
|
|
void
|
|
add_local_generic(Relobj* relobj, unsigned int local_sym_index,
|
|
unsigned int type, Output_data* od, uint64_t address,
|
|
uint64_t addend)
|
|
{
|
|
gold_assert(addend == 0);
|
|
Sized_relobj<size, big_endian>* sized_relobj =
|
|
static_cast<Sized_relobj<size, big_endian> *>(relobj);
|
|
this->add(od, Output_reloc_type(sized_relobj, local_sym_index, type, od,
|
|
convert_types<Address, uint64_t>(address),
|
|
false, false, false, false));
|
|
}
|
|
|
|
void
|
|
add_local_generic(Relobj* relobj, unsigned int local_sym_index,
|
|
unsigned int type, Output_data* od, unsigned int shndx,
|
|
uint64_t address, uint64_t addend)
|
|
{
|
|
gold_assert(addend == 0);
|
|
Sized_relobj<size, big_endian>* sized_relobj =
|
|
static_cast<Sized_relobj<size, big_endian>*>(relobj);
|
|
this->add(od, Output_reloc_type(sized_relobj, local_sym_index, type, shndx,
|
|
convert_types<Address, uint64_t>(address),
|
|
false, false, false, false));
|
|
}
|
|
|
|
// Add a RELATIVE reloc against a local symbol.
|
|
|
|
void
|
|
add_local_relative(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int local_sym_index, unsigned int type,
|
|
Output_data* od, Address address)
|
|
{
|
|
this->add(od, Output_reloc_type(relobj, local_sym_index, type, od,
|
|
address, true, true, false, false));
|
|
}
|
|
|
|
void
|
|
add_local_relative(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int local_sym_index, unsigned int type,
|
|
Output_data* od, unsigned int shndx, Address address)
|
|
{
|
|
this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
|
|
address, true, true, false, false));
|
|
}
|
|
|
|
void
|
|
add_local_relative(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int local_sym_index, unsigned int type,
|
|
Output_data* od, unsigned int shndx, Address address,
|
|
bool use_plt_offset)
|
|
{
|
|
this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
|
|
address, true, true, false,
|
|
use_plt_offset));
|
|
}
|
|
|
|
// Add a local relocation which does not use a symbol for the relocation,
|
|
// but which gets its addend from a symbol.
|
|
|
|
void
|
|
add_symbolless_local_addend(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int local_sym_index, unsigned int type,
|
|
Output_data* od, Address address)
|
|
{
|
|
this->add(od, Output_reloc_type(relobj, local_sym_index, type, od,
|
|
address, false, true, false, false));
|
|
}
|
|
|
|
void
|
|
add_symbolless_local_addend(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int local_sym_index, unsigned int type,
|
|
Output_data* od, unsigned int shndx,
|
|
Address address)
|
|
{
|
|
this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
|
|
address, false, true, false, false));
|
|
}
|
|
|
|
// Add a reloc against a local section symbol. This will be
|
|
// converted into a reloc against the STT_SECTION symbol of the
|
|
// output section.
|
|
|
|
void
|
|
add_local_section(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int input_shndx, unsigned int type,
|
|
Output_data* od, Address address)
|
|
{
|
|
this->add(od, Output_reloc_type(relobj, input_shndx, type, od,
|
|
address, false, false, true, false));
|
|
}
|
|
|
|
void
|
|
add_local_section(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int input_shndx, unsigned int type,
|
|
Output_data* od, unsigned int shndx, Address address)
|
|
{
|
|
this->add(od, Output_reloc_type(relobj, input_shndx, type, shndx,
|
|
address, false, false, true, false));
|
|
}
|
|
|
|
// A reloc against the STT_SECTION symbol of an output section.
|
|
// OS is the Output_section that the relocation refers to; OD is
|
|
// the Output_data object being relocated.
|
|
|
|
void
|
|
add_output_section(Output_section* os, unsigned int type,
|
|
Output_data* od, Address address)
|
|
{ this->add(od, Output_reloc_type(os, type, od, address, false)); }
|
|
|
|
void
|
|
add_output_section(Output_section* os, unsigned int type, Output_data* od,
|
|
Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int shndx, Address address)
|
|
{ this->add(od, Output_reloc_type(os, type, relobj, shndx, address, false)); }
|
|
|
|
void
|
|
add_output_section_generic(Output_section* os, unsigned int type,
|
|
Output_data* od, uint64_t address,
|
|
uint64_t addend)
|
|
{
|
|
gold_assert(addend == 0);
|
|
this->add(od, Output_reloc_type(os, type, od,
|
|
convert_types<Address, uint64_t>(address),
|
|
false));
|
|
}
|
|
|
|
void
|
|
add_output_section_generic(Output_section* os, unsigned int type,
|
|
Output_data* od, Relobj* relobj,
|
|
unsigned int shndx, uint64_t address,
|
|
uint64_t addend)
|
|
{
|
|
gold_assert(addend == 0);
|
|
Sized_relobj<size, big_endian>* sized_relobj =
|
|
static_cast<Sized_relobj<size, big_endian>*>(relobj);
|
|
this->add(od, Output_reloc_type(os, type, sized_relobj, shndx,
|
|
convert_types<Address, uint64_t>(address),
|
|
false));
|
|
}
|
|
|
|
// As above, but the reloc TYPE is relative
|
|
|
|
void
|
|
add_output_section_relative(Output_section* os, unsigned int type,
|
|
Output_data* od, Address address)
|
|
{ this->add(od, Output_reloc_type(os, type, od, address, true)); }
|
|
|
|
void
|
|
add_output_section_relative(Output_section* os, unsigned int type,
|
|
Output_data* od,
|
|
Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int shndx, Address address)
|
|
{ this->add(od, Output_reloc_type(os, type, relobj, shndx, address, true)); }
|
|
|
|
// Add an absolute relocation.
|
|
|
|
void
|
|
add_absolute(unsigned int type, Output_data* od, Address address)
|
|
{ this->add(od, Output_reloc_type(type, od, address, false)); }
|
|
|
|
void
|
|
add_absolute(unsigned int type, Output_data* od,
|
|
Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int shndx, Address address)
|
|
{ this->add(od, Output_reloc_type(type, relobj, shndx, address, false)); }
|
|
|
|
// Add a relative relocation
|
|
|
|
void
|
|
add_relative(unsigned int type, Output_data* od, Address address)
|
|
{ this->add(od, Output_reloc_type(type, od, address, true)); }
|
|
|
|
void
|
|
add_relative(unsigned int type, Output_data* od,
|
|
Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int shndx, Address address)
|
|
{ this->add(od, Output_reloc_type(type, relobj, shndx, address, true)); }
|
|
|
|
// Add a target specific relocation. A target which calls this must
|
|
// define the reloc_symbol_index and reloc_addend virtual functions.
|
|
|
|
void
|
|
add_target_specific(unsigned int type, void* arg, Output_data* od,
|
|
Address address)
|
|
{ this->add(od, Output_reloc_type(type, arg, od, address)); }
|
|
|
|
void
|
|
add_target_specific(unsigned int type, void* arg, Output_data* od,
|
|
Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int shndx, Address address)
|
|
{ this->add(od, Output_reloc_type(type, arg, relobj, shndx, address)); }
|
|
};
|
|
|
|
// The SHT_RELA version of Output_data_reloc.
|
|
|
|
template<bool dynamic, int size, bool big_endian>
|
|
class Output_data_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian>
|
|
: public Output_data_reloc_base<elfcpp::SHT_RELA, dynamic, size, big_endian>
|
|
{
|
|
private:
|
|
typedef Output_data_reloc_base<elfcpp::SHT_RELA, dynamic, size,
|
|
big_endian> Base;
|
|
|
|
public:
|
|
typedef typename Base::Output_reloc_type Output_reloc_type;
|
|
typedef typename Output_reloc_type::Address Address;
|
|
typedef typename Output_reloc_type::Addend Addend;
|
|
|
|
Output_data_reloc(bool sr)
|
|
: Output_data_reloc_base<elfcpp::SHT_RELA, dynamic, size, big_endian>(sr)
|
|
{ }
|
|
|
|
// Add a reloc against a global symbol.
|
|
|
|
void
|
|
add_global(Symbol* gsym, unsigned int type, Output_data* od,
|
|
Address address, Addend addend)
|
|
{
|
|
this->add(od, Output_reloc_type(gsym, type, od, address, addend,
|
|
false, false, false));
|
|
}
|
|
|
|
void
|
|
add_global(Symbol* gsym, unsigned int type, Output_data* od,
|
|
Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int shndx, Address address,
|
|
Addend addend)
|
|
{
|
|
this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
|
|
addend, false, false, false));
|
|
}
|
|
|
|
void
|
|
add_global_generic(Symbol* gsym, unsigned int type, Output_data* od,
|
|
uint64_t address, uint64_t addend)
|
|
{
|
|
this->add(od, Output_reloc_type(gsym, type, od,
|
|
convert_types<Address, uint64_t>(address),
|
|
convert_types<Addend, uint64_t>(addend),
|
|
false, false, false));
|
|
}
|
|
|
|
void
|
|
add_global_generic(Symbol* gsym, unsigned int type, Output_data* od,
|
|
Relobj* relobj, unsigned int shndx, uint64_t address,
|
|
uint64_t addend)
|
|
{
|
|
Sized_relobj<size, big_endian>* sized_relobj =
|
|
static_cast<Sized_relobj<size, big_endian>*>(relobj);
|
|
this->add(od, Output_reloc_type(gsym, type, sized_relobj, shndx,
|
|
convert_types<Address, uint64_t>(address),
|
|
convert_types<Addend, uint64_t>(addend),
|
|
false, false, false));
|
|
}
|
|
|
|
// Add a RELATIVE reloc against a global symbol. The final output
|
|
// relocation will not reference the symbol, but we must keep the symbol
|
|
// information long enough to set the addend of the relocation correctly
|
|
// when it is written.
|
|
|
|
void
|
|
add_global_relative(Symbol* gsym, unsigned int type, Output_data* od,
|
|
Address address, Addend addend, bool use_plt_offset)
|
|
{
|
|
this->add(od, Output_reloc_type(gsym, type, od, address, addend, true,
|
|
true, use_plt_offset));
|
|
}
|
|
|
|
void
|
|
add_global_relative(Symbol* gsym, unsigned int type, Output_data* od,
|
|
Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int shndx, Address address, Addend addend,
|
|
bool use_plt_offset)
|
|
{
|
|
this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
|
|
addend, true, true, use_plt_offset));
|
|
}
|
|
|
|
// Add a global relocation which does not use a symbol for the relocation,
|
|
// but which gets its addend from a symbol.
|
|
|
|
void
|
|
add_symbolless_global_addend(Symbol* gsym, unsigned int type, Output_data* od,
|
|
Address address, Addend addend)
|
|
{
|
|
this->add(od, Output_reloc_type(gsym, type, od, address, addend,
|
|
false, true, false));
|
|
}
|
|
|
|
void
|
|
add_symbolless_global_addend(Symbol* gsym, unsigned int type,
|
|
Output_data* od,
|
|
Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int shndx, Address address,
|
|
Addend addend)
|
|
{
|
|
this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
|
|
addend, false, true, false));
|
|
}
|
|
|
|
// Add a reloc against a local symbol.
|
|
|
|
void
|
|
add_local(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int local_sym_index, unsigned int type,
|
|
Output_data* od, Address address, Addend addend)
|
|
{
|
|
this->add(od, Output_reloc_type(relobj, local_sym_index, type, od, address,
|
|
addend, false, false, false, false));
|
|
}
|
|
|
|
void
|
|
add_local(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int local_sym_index, unsigned int type,
|
|
Output_data* od, unsigned int shndx, Address address,
|
|
Addend addend)
|
|
{
|
|
this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
|
|
address, addend, false, false, false,
|
|
false));
|
|
}
|
|
|
|
void
|
|
add_local_generic(Relobj* relobj, unsigned int local_sym_index,
|
|
unsigned int type, Output_data* od, uint64_t address,
|
|
uint64_t addend)
|
|
{
|
|
Sized_relobj<size, big_endian>* sized_relobj =
|
|
static_cast<Sized_relobj<size, big_endian> *>(relobj);
|
|
this->add(od, Output_reloc_type(sized_relobj, local_sym_index, type, od,
|
|
convert_types<Address, uint64_t>(address),
|
|
convert_types<Addend, uint64_t>(addend),
|
|
false, false, false, false));
|
|
}
|
|
|
|
void
|
|
add_local_generic(Relobj* relobj, unsigned int local_sym_index,
|
|
unsigned int type, Output_data* od, unsigned int shndx,
|
|
uint64_t address, uint64_t addend)
|
|
{
|
|
Sized_relobj<size, big_endian>* sized_relobj =
|
|
static_cast<Sized_relobj<size, big_endian>*>(relobj);
|
|
this->add(od, Output_reloc_type(sized_relobj, local_sym_index, type, shndx,
|
|
convert_types<Address, uint64_t>(address),
|
|
convert_types<Addend, uint64_t>(addend),
|
|
false, false, false, false));
|
|
}
|
|
|
|
// Add a RELATIVE reloc against a local symbol.
|
|
|
|
void
|
|
add_local_relative(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int local_sym_index, unsigned int type,
|
|
Output_data* od, Address address, Addend addend,
|
|
bool use_plt_offset)
|
|
{
|
|
this->add(od, Output_reloc_type(relobj, local_sym_index, type, od, address,
|
|
addend, true, true, false,
|
|
use_plt_offset));
|
|
}
|
|
|
|
void
|
|
add_local_relative(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int local_sym_index, unsigned int type,
|
|
Output_data* od, unsigned int shndx, Address address,
|
|
Addend addend, bool use_plt_offset)
|
|
{
|
|
this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
|
|
address, addend, true, true, false,
|
|
use_plt_offset));
|
|
}
|
|
|
|
// Add a local relocation which does not use a symbol for the relocation,
|
|
// but which gets it's addend from a symbol.
|
|
|
|
void
|
|
add_symbolless_local_addend(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int local_sym_index, unsigned int type,
|
|
Output_data* od, Address address, Addend addend)
|
|
{
|
|
this->add(od, Output_reloc_type(relobj, local_sym_index, type, od, address,
|
|
addend, false, true, false, false));
|
|
}
|
|
|
|
void
|
|
add_symbolless_local_addend(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int local_sym_index, unsigned int type,
|
|
Output_data* od, unsigned int shndx,
|
|
Address address, Addend addend)
|
|
{
|
|
this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
|
|
address, addend, false, true, false,
|
|
false));
|
|
}
|
|
|
|
// Add a reloc against a local section symbol. This will be
|
|
// converted into a reloc against the STT_SECTION symbol of the
|
|
// output section.
|
|
|
|
void
|
|
add_local_section(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int input_shndx, unsigned int type,
|
|
Output_data* od, Address address, Addend addend)
|
|
{
|
|
this->add(od, Output_reloc_type(relobj, input_shndx, type, od, address,
|
|
addend, false, false, true, false));
|
|
}
|
|
|
|
void
|
|
add_local_section(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int input_shndx, unsigned int type,
|
|
Output_data* od, unsigned int shndx, Address address,
|
|
Addend addend)
|
|
{
|
|
this->add(od, Output_reloc_type(relobj, input_shndx, type, shndx,
|
|
address, addend, false, false, true,
|
|
false));
|
|
}
|
|
|
|
// A reloc against the STT_SECTION symbol of an output section.
|
|
|
|
void
|
|
add_output_section(Output_section* os, unsigned int type, Output_data* od,
|
|
Address address, Addend addend)
|
|
{ this->add(od, Output_reloc_type(os, type, od, address, addend, false)); }
|
|
|
|
void
|
|
add_output_section(Output_section* os, unsigned int type, Output_data* od,
|
|
Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int shndx, Address address, Addend addend)
|
|
{
|
|
this->add(od, Output_reloc_type(os, type, relobj, shndx, address,
|
|
addend, false));
|
|
}
|
|
|
|
void
|
|
add_output_section_generic(Output_section* os, unsigned int type,
|
|
Output_data* od, uint64_t address,
|
|
uint64_t addend)
|
|
{
|
|
this->add(od, Output_reloc_type(os, type, od,
|
|
convert_types<Address, uint64_t>(address),
|
|
convert_types<Addend, uint64_t>(addend),
|
|
false));
|
|
}
|
|
|
|
void
|
|
add_output_section_generic(Output_section* os, unsigned int type,
|
|
Output_data* od, Relobj* relobj,
|
|
unsigned int shndx, uint64_t address,
|
|
uint64_t addend)
|
|
{
|
|
Sized_relobj<size, big_endian>* sized_relobj =
|
|
static_cast<Sized_relobj<size, big_endian>*>(relobj);
|
|
this->add(od, Output_reloc_type(os, type, sized_relobj, shndx,
|
|
convert_types<Address, uint64_t>(address),
|
|
convert_types<Addend, uint64_t>(addend),
|
|
false));
|
|
}
|
|
|
|
// As above, but the reloc TYPE is relative
|
|
|
|
void
|
|
add_output_section_relative(Output_section* os, unsigned int type,
|
|
Output_data* od, Address address, Addend addend)
|
|
{ this->add(od, Output_reloc_type(os, type, od, address, addend, true)); }
|
|
|
|
void
|
|
add_output_section_relative(Output_section* os, unsigned int type,
|
|
Output_data* od,
|
|
Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int shndx, Address address,
|
|
Addend addend)
|
|
{
|
|
this->add(od, Output_reloc_type(os, type, relobj, shndx,
|
|
address, addend, true));
|
|
}
|
|
|
|
// Add an absolute relocation.
|
|
|
|
void
|
|
add_absolute(unsigned int type, Output_data* od, Address address,
|
|
Addend addend)
|
|
{ this->add(od, Output_reloc_type(type, od, address, addend, false)); }
|
|
|
|
void
|
|
add_absolute(unsigned int type, Output_data* od,
|
|
Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int shndx, Address address, Addend addend)
|
|
{
|
|
this->add(od, Output_reloc_type(type, relobj, shndx, address, addend,
|
|
false));
|
|
}
|
|
|
|
// Add a relative relocation
|
|
|
|
void
|
|
add_relative(unsigned int type, Output_data* od, Address address,
|
|
Addend addend)
|
|
{ this->add(od, Output_reloc_type(type, od, address, addend, true)); }
|
|
|
|
void
|
|
add_relative(unsigned int type, Output_data* od,
|
|
Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int shndx, Address address, Addend addend)
|
|
{
|
|
this->add(od, Output_reloc_type(type, relobj, shndx, address, addend,
|
|
true));
|
|
}
|
|
|
|
// Add a target specific relocation. A target which calls this must
|
|
// define the reloc_symbol_index and reloc_addend virtual functions.
|
|
|
|
void
|
|
add_target_specific(unsigned int type, void* arg, Output_data* od,
|
|
Address address, Addend addend)
|
|
{ this->add(od, Output_reloc_type(type, arg, od, address, addend)); }
|
|
|
|
void
|
|
add_target_specific(unsigned int type, void* arg, Output_data* od,
|
|
Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int shndx, Address address, Addend addend)
|
|
{
|
|
this->add(od, Output_reloc_type(type, arg, relobj, shndx, address,
|
|
addend));
|
|
}
|
|
};
|
|
|
|
// Output_relocatable_relocs represents a relocation section in a
|
|
// relocatable link. The actual data is written out in the target
|
|
// hook relocate_relocs. This just saves space for it.
|
|
|
|
template<int sh_type, int size, bool big_endian>
|
|
class Output_relocatable_relocs : public Output_section_data
|
|
{
|
|
public:
|
|
Output_relocatable_relocs(Relocatable_relocs* rr)
|
|
: Output_section_data(Output_data::default_alignment_for_size(size)),
|
|
rr_(rr)
|
|
{ }
|
|
|
|
void
|
|
set_final_data_size();
|
|
|
|
// Write out the data. There is nothing to do here.
|
|
void
|
|
do_write(Output_file*)
|
|
{ }
|
|
|
|
// Write to a map file.
|
|
void
|
|
do_print_to_mapfile(Mapfile* mapfile) const
|
|
{ mapfile->print_output_data(this, _("** relocs")); }
|
|
|
|
private:
|
|
// The relocs associated with this input section.
|
|
Relocatable_relocs* rr_;
|
|
};
|
|
|
|
// Handle a GROUP section.
|
|
|
|
template<int size, bool big_endian>
|
|
class Output_data_group : public Output_section_data
|
|
{
|
|
public:
|
|
// The constructor clears *INPUT_SHNDXES.
|
|
Output_data_group(Sized_relobj_file<size, big_endian>* relobj,
|
|
section_size_type entry_count,
|
|
elfcpp::Elf_Word flags,
|
|
std::vector<unsigned int>* input_shndxes);
|
|
|
|
void
|
|
do_write(Output_file*);
|
|
|
|
// Write to a map file.
|
|
void
|
|
do_print_to_mapfile(Mapfile* mapfile) const
|
|
{ mapfile->print_output_data(this, _("** group")); }
|
|
|
|
// Set final data size.
|
|
void
|
|
set_final_data_size()
|
|
{ this->set_data_size((this->input_shndxes_.size() + 1) * 4); }
|
|
|
|
private:
|
|
// The input object.
|
|
Sized_relobj_file<size, big_endian>* relobj_;
|
|
// The group flag word.
|
|
elfcpp::Elf_Word flags_;
|
|
// The section indexes of the input sections in this group.
|
|
std::vector<unsigned int> input_shndxes_;
|
|
};
|
|
|
|
// Output_data_got is used to manage a GOT. Each entry in the GOT is
|
|
// for one symbol--either a global symbol or a local symbol in an
|
|
// object. The target specific code adds entries to the GOT as
|
|
// needed. The GOT_SIZE template parameter is the size in bits of a
|
|
// GOT entry, typically 32 or 64.
|
|
|
|
class Output_data_got_base : public Output_section_data_build
|
|
{
|
|
public:
|
|
Output_data_got_base(uint64_t align)
|
|
: Output_section_data_build(align)
|
|
{ }
|
|
|
|
Output_data_got_base(off_t data_size, uint64_t align)
|
|
: Output_section_data_build(data_size, align)
|
|
{ }
|
|
|
|
// Reserve the slot at index I in the GOT.
|
|
void
|
|
reserve_slot(unsigned int i)
|
|
{ this->do_reserve_slot(i); }
|
|
|
|
protected:
|
|
// Reserve the slot at index I in the GOT.
|
|
virtual void
|
|
do_reserve_slot(unsigned int i) = 0;
|
|
};
|
|
|
|
template<int got_size, bool big_endian>
|
|
class Output_data_got : public Output_data_got_base
|
|
{
|
|
public:
|
|
typedef typename elfcpp::Elf_types<got_size>::Elf_Addr Valtype;
|
|
|
|
Output_data_got()
|
|
: Output_data_got_base(Output_data::default_alignment_for_size(got_size)),
|
|
entries_(), free_list_()
|
|
{ }
|
|
|
|
Output_data_got(off_t data_size)
|
|
: Output_data_got_base(data_size,
|
|
Output_data::default_alignment_for_size(got_size)),
|
|
entries_(), free_list_()
|
|
{
|
|
// For an incremental update, we have an existing GOT section.
|
|
// Initialize the list of entries and the free list.
|
|
this->entries_.resize(data_size / (got_size / 8));
|
|
this->free_list_.init(data_size, false);
|
|
}
|
|
|
|
// Add an entry for a global symbol to the GOT. Return true if this
|
|
// is a new GOT entry, false if the symbol was already in the GOT.
|
|
bool
|
|
add_global(Symbol* gsym, unsigned int got_type);
|
|
|
|
// Like add_global, but use the PLT offset of the global symbol if
|
|
// it has one.
|
|
bool
|
|
add_global_plt(Symbol* gsym, unsigned int got_type);
|
|
|
|
// Like add_global, but for a TLS symbol where the value will be
|
|
// offset using Target::tls_offset_for_global.
|
|
bool
|
|
add_global_tls(Symbol* gsym, unsigned int got_type)
|
|
{ return add_global_plt(gsym, got_type); }
|
|
|
|
// Add an entry for a global symbol to the GOT, and add a dynamic
|
|
// relocation of type R_TYPE for the GOT entry.
|
|
void
|
|
add_global_with_rel(Symbol* gsym, unsigned int got_type,
|
|
Output_data_reloc_generic* rel_dyn, unsigned int r_type);
|
|
|
|
// Add a pair of entries for a global symbol to the GOT, and add
|
|
// dynamic relocations of type R_TYPE_1 and R_TYPE_2, respectively.
|
|
void
|
|
add_global_pair_with_rel(Symbol* gsym, unsigned int got_type,
|
|
Output_data_reloc_generic* rel_dyn,
|
|
unsigned int r_type_1, unsigned int r_type_2);
|
|
|
|
// Add an entry for a local symbol to the GOT. This returns true if
|
|
// this is a new GOT entry, false if the symbol already has a GOT
|
|
// entry.
|
|
bool
|
|
add_local(Relobj* object, unsigned int sym_index, unsigned int got_type);
|
|
|
|
// Like add_local, but use the PLT offset of the local symbol if it
|
|
// has one.
|
|
bool
|
|
add_local_plt(Relobj* object, unsigned int sym_index, unsigned int got_type);
|
|
|
|
// Like add_local, but for a TLS symbol where the value will be
|
|
// offset using Target::tls_offset_for_local.
|
|
bool
|
|
add_local_tls(Relobj* object, unsigned int sym_index, unsigned int got_type)
|
|
{ return add_local_plt(object, sym_index, got_type); }
|
|
|
|
// Add an entry for a local symbol to the GOT, and add a dynamic
|
|
// relocation of type R_TYPE for the GOT entry.
|
|
void
|
|
add_local_with_rel(Relobj* object, unsigned int sym_index,
|
|
unsigned int got_type, Output_data_reloc_generic* rel_dyn,
|
|
unsigned int r_type);
|
|
|
|
// Add a pair of entries for a local symbol to the GOT, and add
|
|
// a dynamic relocation of type R_TYPE using the section symbol of
|
|
// the output section to which input section SHNDX maps, on the first.
|
|
// The first got entry will have a value of zero, the second the
|
|
// value of the local symbol.
|
|
void
|
|
add_local_pair_with_rel(Relobj* object, unsigned int sym_index,
|
|
unsigned int shndx, unsigned int got_type,
|
|
Output_data_reloc_generic* rel_dyn,
|
|
unsigned int r_type);
|
|
|
|
// Add a pair of entries for a local symbol to the GOT, and add
|
|
// a dynamic relocation of type R_TYPE using STN_UNDEF on the first.
|
|
// The first got entry will have a value of zero, the second the
|
|
// value of the local symbol offset by Target::tls_offset_for_local.
|
|
void
|
|
add_local_tls_pair(Relobj* object, unsigned int sym_index,
|
|
unsigned int got_type,
|
|
Output_data_reloc_generic* rel_dyn,
|
|
unsigned int r_type);
|
|
|
|
// Add a constant to the GOT. This returns the offset of the new
|
|
// entry from the start of the GOT.
|
|
unsigned int
|
|
add_constant(Valtype constant)
|
|
{ return this->add_got_entry(Got_entry(constant)); }
|
|
|
|
// Add a pair of constants to the GOT. This returns the offset of
|
|
// the new entry from the start of the GOT.
|
|
unsigned int
|
|
add_constant_pair(Valtype c1, Valtype c2)
|
|
{ return this->add_got_entry_pair(Got_entry(c1), Got_entry(c2)); }
|
|
|
|
// Replace GOT entry I with a new constant.
|
|
void
|
|
replace_constant(unsigned int i, Valtype constant)
|
|
{
|
|
this->replace_got_entry(i, Got_entry(constant));
|
|
}
|
|
|
|
// Reserve a slot in the GOT for a local symbol.
|
|
void
|
|
reserve_local(unsigned int i, Relobj* object, unsigned int sym_index,
|
|
unsigned int got_type);
|
|
|
|
// Reserve a slot in the GOT for a global symbol.
|
|
void
|
|
reserve_global(unsigned int i, Symbol* gsym, unsigned int got_type);
|
|
|
|
protected:
|
|
// Write out the GOT table.
|
|
void
|
|
do_write(Output_file*);
|
|
|
|
// Write to a map file.
|
|
void
|
|
do_print_to_mapfile(Mapfile* mapfile) const
|
|
{ mapfile->print_output_data(this, _("** GOT")); }
|
|
|
|
// Reserve the slot at index I in the GOT.
|
|
virtual void
|
|
do_reserve_slot(unsigned int i)
|
|
{ this->free_list_.remove(i * got_size / 8, (i + 1) * got_size / 8); }
|
|
|
|
// Return the number of words in the GOT.
|
|
unsigned int
|
|
num_entries () const
|
|
{ return this->entries_.size(); }
|
|
|
|
// Return the offset into the GOT of GOT entry I.
|
|
unsigned int
|
|
got_offset(unsigned int i) const
|
|
{ return i * (got_size / 8); }
|
|
|
|
private:
|
|
// This POD class holds a single GOT entry.
|
|
class Got_entry
|
|
{
|
|
public:
|
|
// Create a zero entry.
|
|
Got_entry()
|
|
: local_sym_index_(RESERVED_CODE), use_plt_or_tls_offset_(false)
|
|
{ this->u_.constant = 0; }
|
|
|
|
// Create a global symbol entry.
|
|
Got_entry(Symbol* gsym, bool use_plt_or_tls_offset)
|
|
: local_sym_index_(GSYM_CODE),
|
|
use_plt_or_tls_offset_(use_plt_or_tls_offset)
|
|
{ this->u_.gsym = gsym; }
|
|
|
|
// Create a local symbol entry.
|
|
Got_entry(Relobj* object, unsigned int local_sym_index,
|
|
bool use_plt_or_tls_offset)
|
|
: local_sym_index_(local_sym_index),
|
|
use_plt_or_tls_offset_(use_plt_or_tls_offset)
|
|
{
|
|
gold_assert(local_sym_index != GSYM_CODE
|
|
&& local_sym_index != CONSTANT_CODE
|
|
&& local_sym_index != RESERVED_CODE
|
|
&& local_sym_index == this->local_sym_index_);
|
|
this->u_.object = object;
|
|
}
|
|
|
|
// Create a constant entry. The constant is a host value--it will
|
|
// be swapped, if necessary, when it is written out.
|
|
explicit Got_entry(Valtype constant)
|
|
: local_sym_index_(CONSTANT_CODE), use_plt_or_tls_offset_(false)
|
|
{ this->u_.constant = constant; }
|
|
|
|
// Write the GOT entry to an output view.
|
|
void
|
|
write(unsigned int got_indx, unsigned char* pov) const;
|
|
|
|
private:
|
|
enum
|
|
{
|
|
GSYM_CODE = 0x7fffffff,
|
|
CONSTANT_CODE = 0x7ffffffe,
|
|
RESERVED_CODE = 0x7ffffffd
|
|
};
|
|
|
|
union
|
|
{
|
|
// For a local symbol, the object.
|
|
Relobj* object;
|
|
// For a global symbol, the symbol.
|
|
Symbol* gsym;
|
|
// For a constant, the constant.
|
|
Valtype constant;
|
|
} u_;
|
|
// For a local symbol, the local symbol index. This is GSYM_CODE
|
|
// for a global symbol, or CONSTANT_CODE for a constant.
|
|
unsigned int local_sym_index_ : 31;
|
|
// Whether to use the PLT offset of the symbol if it has one.
|
|
// For TLS symbols, whether to offset the symbol value.
|
|
bool use_plt_or_tls_offset_ : 1;
|
|
};
|
|
|
|
typedef std::vector<Got_entry> Got_entries;
|
|
|
|
// Create a new GOT entry and return its offset.
|
|
unsigned int
|
|
add_got_entry(Got_entry got_entry);
|
|
|
|
// Create a pair of new GOT entries and return the offset of the first.
|
|
unsigned int
|
|
add_got_entry_pair(Got_entry got_entry_1, Got_entry got_entry_2);
|
|
|
|
// Replace GOT entry I with a new value.
|
|
void
|
|
replace_got_entry(unsigned int i, Got_entry got_entry);
|
|
|
|
// Return the offset into the GOT of the last entry added.
|
|
unsigned int
|
|
last_got_offset() const
|
|
{ return this->got_offset(this->num_entries() - 1); }
|
|
|
|
// Set the size of the section.
|
|
void
|
|
set_got_size()
|
|
{ this->set_current_data_size(this->got_offset(this->num_entries())); }
|
|
|
|
// The list of GOT entries.
|
|
Got_entries entries_;
|
|
|
|
// List of available regions within the section, for incremental
|
|
// update links.
|
|
Free_list free_list_;
|
|
};
|
|
|
|
// Output_data_dynamic is used to hold the data in SHT_DYNAMIC
|
|
// section.
|
|
|
|
class Output_data_dynamic : public Output_section_data
|
|
{
|
|
public:
|
|
Output_data_dynamic(Stringpool* pool)
|
|
: Output_section_data(Output_data::default_alignment()),
|
|
entries_(), pool_(pool)
|
|
{ }
|
|
|
|
// Add a new dynamic entry with a fixed numeric value.
|
|
void
|
|
add_constant(elfcpp::DT tag, unsigned int val)
|
|
{ this->add_entry(Dynamic_entry(tag, val)); }
|
|
|
|
// Add a new dynamic entry with the address of output data.
|
|
void
|
|
add_section_address(elfcpp::DT tag, const Output_data* od)
|
|
{ this->add_entry(Dynamic_entry(tag, od, false)); }
|
|
|
|
// Add a new dynamic entry with the address of output data
|
|
// plus a constant offset.
|
|
void
|
|
add_section_plus_offset(elfcpp::DT tag, const Output_data* od,
|
|
unsigned int offset)
|
|
{ this->add_entry(Dynamic_entry(tag, od, offset)); }
|
|
|
|
// Add a new dynamic entry with the size of output data.
|
|
void
|
|
add_section_size(elfcpp::DT tag, const Output_data* od)
|
|
{ this->add_entry(Dynamic_entry(tag, od, true)); }
|
|
|
|
// Add a new dynamic entry with the total size of two output datas.
|
|
void
|
|
add_section_size(elfcpp::DT tag, const Output_data* od,
|
|
const Output_data* od2)
|
|
{ this->add_entry(Dynamic_entry(tag, od, od2)); }
|
|
|
|
// Add a new dynamic entry with the address of a symbol.
|
|
void
|
|
add_symbol(elfcpp::DT tag, const Symbol* sym)
|
|
{ this->add_entry(Dynamic_entry(tag, sym)); }
|
|
|
|
// Add a new dynamic entry with a string.
|
|
void
|
|
add_string(elfcpp::DT tag, const char* str)
|
|
{ this->add_entry(Dynamic_entry(tag, this->pool_->add(str, true, NULL))); }
|
|
|
|
void
|
|
add_string(elfcpp::DT tag, const std::string& str)
|
|
{ this->add_string(tag, str.c_str()); }
|
|
|
|
// Add a new dynamic entry with custom value.
|
|
void
|
|
add_custom(elfcpp::DT tag)
|
|
{ this->add_entry(Dynamic_entry(tag)); }
|
|
|
|
protected:
|
|
// Adjust the output section to set the entry size.
|
|
void
|
|
do_adjust_output_section(Output_section*);
|
|
|
|
// Set the final data size.
|
|
void
|
|
set_final_data_size();
|
|
|
|
// Write out the dynamic entries.
|
|
void
|
|
do_write(Output_file*);
|
|
|
|
// Write to a map file.
|
|
void
|
|
do_print_to_mapfile(Mapfile* mapfile) const
|
|
{ mapfile->print_output_data(this, _("** dynamic")); }
|
|
|
|
private:
|
|
// This POD class holds a single dynamic entry.
|
|
class Dynamic_entry
|
|
{
|
|
public:
|
|
// Create an entry with a fixed numeric value.
|
|
Dynamic_entry(elfcpp::DT tag, unsigned int val)
|
|
: tag_(tag), offset_(DYNAMIC_NUMBER)
|
|
{ this->u_.val = val; }
|
|
|
|
// Create an entry with the size or address of a section.
|
|
Dynamic_entry(elfcpp::DT tag, const Output_data* od, bool section_size)
|
|
: tag_(tag),
|
|
offset_(section_size
|
|
? DYNAMIC_SECTION_SIZE
|
|
: DYNAMIC_SECTION_ADDRESS)
|
|
{
|
|
this->u_.od = od;
|
|
this->od2 = NULL;
|
|
}
|
|
|
|
// Create an entry with the size of two sections.
|
|
Dynamic_entry(elfcpp::DT tag, const Output_data* od, const Output_data* od2)
|
|
: tag_(tag),
|
|
offset_(DYNAMIC_SECTION_SIZE)
|
|
{
|
|
this->u_.od = od;
|
|
this->od2 = od2;
|
|
}
|
|
|
|
// Create an entry with the address of a section plus a constant offset.
|
|
Dynamic_entry(elfcpp::DT tag, const Output_data* od, unsigned int offset)
|
|
: tag_(tag),
|
|
offset_(offset)
|
|
{ this->u_.od = od; }
|
|
|
|
// Create an entry with the address of a symbol.
|
|
Dynamic_entry(elfcpp::DT tag, const Symbol* sym)
|
|
: tag_(tag), offset_(DYNAMIC_SYMBOL)
|
|
{ this->u_.sym = sym; }
|
|
|
|
// Create an entry with a string.
|
|
Dynamic_entry(elfcpp::DT tag, const char* str)
|
|
: tag_(tag), offset_(DYNAMIC_STRING)
|
|
{ this->u_.str = str; }
|
|
|
|
// Create an entry with a custom value.
|
|
Dynamic_entry(elfcpp::DT tag)
|
|
: tag_(tag), offset_(DYNAMIC_CUSTOM)
|
|
{ }
|
|
|
|
// Return the tag of this entry.
|
|
elfcpp::DT
|
|
tag() const
|
|
{ return this->tag_; }
|
|
|
|
// Write the dynamic entry to an output view.
|
|
template<int size, bool big_endian>
|
|
void
|
|
write(unsigned char* pov, const Stringpool*) const;
|
|
|
|
private:
|
|
// Classification is encoded in the OFFSET field.
|
|
enum Classification
|
|
{
|
|
// Section address.
|
|
DYNAMIC_SECTION_ADDRESS = 0,
|
|
// Number.
|
|
DYNAMIC_NUMBER = -1U,
|
|
// Section size.
|
|
DYNAMIC_SECTION_SIZE = -2U,
|
|
// Symbol adress.
|
|
DYNAMIC_SYMBOL = -3U,
|
|
// String.
|
|
DYNAMIC_STRING = -4U,
|
|
// Custom value.
|
|
DYNAMIC_CUSTOM = -5U
|
|
// Any other value indicates a section address plus OFFSET.
|
|
};
|
|
|
|
union
|
|
{
|
|
// For DYNAMIC_NUMBER.
|
|
unsigned int val;
|
|
// For DYNAMIC_SECTION_SIZE and section address plus OFFSET.
|
|
const Output_data* od;
|
|
// For DYNAMIC_SYMBOL.
|
|
const Symbol* sym;
|
|
// For DYNAMIC_STRING.
|
|
const char* str;
|
|
} u_;
|
|
// For DYNAMIC_SYMBOL with two sections.
|
|
const Output_data* od2;
|
|
// The dynamic tag.
|
|
elfcpp::DT tag_;
|
|
// The type of entry (Classification) or offset within a section.
|
|
unsigned int offset_;
|
|
};
|
|
|
|
// Add an entry to the list.
|
|
void
|
|
add_entry(const Dynamic_entry& entry)
|
|
{ this->entries_.push_back(entry); }
|
|
|
|
// Sized version of write function.
|
|
template<int size, bool big_endian>
|
|
void
|
|
sized_write(Output_file* of);
|
|
|
|
// The type of the list of entries.
|
|
typedef std::vector<Dynamic_entry> Dynamic_entries;
|
|
|
|
// The entries.
|
|
Dynamic_entries entries_;
|
|
// The pool used for strings.
|
|
Stringpool* pool_;
|
|
};
|
|
|
|
// Output_symtab_xindex is used to handle SHT_SYMTAB_SHNDX sections,
|
|
// which may be required if the object file has more than
|
|
// SHN_LORESERVE sections.
|
|
|
|
class Output_symtab_xindex : public Output_section_data
|
|
{
|
|
public:
|
|
Output_symtab_xindex(size_t symcount)
|
|
: Output_section_data(symcount * 4, 4, true),
|
|
entries_()
|
|
{ }
|
|
|
|
// Add an entry: symbol number SYMNDX has section SHNDX.
|
|
void
|
|
add(unsigned int symndx, unsigned int shndx)
|
|
{ this->entries_.push_back(std::make_pair(symndx, shndx)); }
|
|
|
|
protected:
|
|
void
|
|
do_write(Output_file*);
|
|
|
|
// Write to a map file.
|
|
void
|
|
do_print_to_mapfile(Mapfile* mapfile) const
|
|
{ mapfile->print_output_data(this, _("** symtab xindex")); }
|
|
|
|
private:
|
|
template<bool big_endian>
|
|
void
|
|
endian_do_write(unsigned char*);
|
|
|
|
// It is likely that most symbols will not require entries. Rather
|
|
// than keep a vector for all symbols, we keep pairs of symbol index
|
|
// and section index.
|
|
typedef std::vector<std::pair<unsigned int, unsigned int> > Xindex_entries;
|
|
|
|
// The entries we need.
|
|
Xindex_entries entries_;
|
|
};
|
|
|
|
// A relaxed input section.
|
|
class Output_relaxed_input_section : public Output_section_data_build
|
|
{
|
|
public:
|
|
// We would like to call relobj->section_addralign(shndx) to get the
|
|
// alignment but we do not want the constructor to fail. So callers
|
|
// are repsonsible for ensuring that.
|
|
Output_relaxed_input_section(Relobj* relobj, unsigned int shndx,
|
|
uint64_t addralign)
|
|
: Output_section_data_build(addralign), relobj_(relobj), shndx_(shndx)
|
|
{ }
|
|
|
|
// Return the Relobj of this relaxed input section.
|
|
Relobj*
|
|
relobj() const
|
|
{ return this->relobj_; }
|
|
|
|
// Return the section index of this relaxed input section.
|
|
unsigned int
|
|
shndx() const
|
|
{ return this->shndx_; }
|
|
|
|
protected:
|
|
void
|
|
set_relobj(Relobj* relobj)
|
|
{ this->relobj_ = relobj; }
|
|
|
|
void
|
|
set_shndx(unsigned int shndx)
|
|
{ this->shndx_ = shndx; }
|
|
|
|
private:
|
|
Relobj* relobj_;
|
|
unsigned int shndx_;
|
|
};
|
|
|
|
// This class describes properties of merge data sections. It is used
|
|
// as a key type for maps.
|
|
class Merge_section_properties
|
|
{
|
|
public:
|
|
Merge_section_properties(bool is_string, uint64_t entsize,
|
|
uint64_t addralign)
|
|
: is_string_(is_string), entsize_(entsize), addralign_(addralign)
|
|
{ }
|
|
|
|
// Whether this equals to another Merge_section_properties MSP.
|
|
bool
|
|
eq(const Merge_section_properties& msp) const
|
|
{
|
|
return ((this->is_string_ == msp.is_string_)
|
|
&& (this->entsize_ == msp.entsize_)
|
|
&& (this->addralign_ == msp.addralign_));
|
|
}
|
|
|
|
// Compute a hash value for this using 64-bit FNV-1a hash.
|
|
size_t
|
|
hash_value() const
|
|
{
|
|
uint64_t h = 14695981039346656037ULL; // FNV offset basis.
|
|
uint64_t prime = 1099511628211ULL;
|
|
h = (h ^ static_cast<uint64_t>(this->is_string_)) * prime;
|
|
h = (h ^ static_cast<uint64_t>(this->entsize_)) * prime;
|
|
h = (h ^ static_cast<uint64_t>(this->addralign_)) * prime;
|
|
return h;
|
|
}
|
|
|
|
// Functors for associative containers.
|
|
struct equal_to
|
|
{
|
|
bool
|
|
operator()(const Merge_section_properties& msp1,
|
|
const Merge_section_properties& msp2) const
|
|
{ return msp1.eq(msp2); }
|
|
};
|
|
|
|
struct hash
|
|
{
|
|
size_t
|
|
operator()(const Merge_section_properties& msp) const
|
|
{ return msp.hash_value(); }
|
|
};
|
|
|
|
private:
|
|
// Whether this merge data section is for strings.
|
|
bool is_string_;
|
|
// Entsize of this merge data section.
|
|
uint64_t entsize_;
|
|
// Address alignment.
|
|
uint64_t addralign_;
|
|
};
|
|
|
|
// This class is used to speed up look up of special input sections in an
|
|
// Output_section.
|
|
|
|
class Output_section_lookup_maps
|
|
{
|
|
public:
|
|
Output_section_lookup_maps()
|
|
: is_valid_(true), merge_sections_by_properties_(),
|
|
merge_sections_by_id_(), relaxed_input_sections_by_id_()
|
|
{ }
|
|
|
|
// Whether the maps are valid.
|
|
bool
|
|
is_valid() const
|
|
{ return this->is_valid_; }
|
|
|
|
// Invalidate the maps.
|
|
void
|
|
invalidate()
|
|
{ this->is_valid_ = false; }
|
|
|
|
// Clear the maps.
|
|
void
|
|
clear()
|
|
{
|
|
this->merge_sections_by_properties_.clear();
|
|
this->merge_sections_by_id_.clear();
|
|
this->relaxed_input_sections_by_id_.clear();
|
|
// A cleared map is valid.
|
|
this->is_valid_ = true;
|
|
}
|
|
|
|
// Find a merge section by merge section properties. Return NULL if none
|
|
// is found.
|
|
Output_merge_base*
|
|
find_merge_section(const Merge_section_properties& msp) const
|
|
{
|
|
gold_assert(this->is_valid_);
|
|
Merge_sections_by_properties::const_iterator p =
|
|
this->merge_sections_by_properties_.find(msp);
|
|
return p != this->merge_sections_by_properties_.end() ? p->second : NULL;
|
|
}
|
|
|
|
// Find a merge section by section ID of a merge input section. Return NULL
|
|
// if none is found.
|
|
Output_merge_base*
|
|
find_merge_section(const Object* object, unsigned int shndx) const
|
|
{
|
|
gold_assert(this->is_valid_);
|
|
Merge_sections_by_id::const_iterator p =
|
|
this->merge_sections_by_id_.find(Const_section_id(object, shndx));
|
|
return p != this->merge_sections_by_id_.end() ? p->second : NULL;
|
|
}
|
|
|
|
// Add a merge section pointed by POMB with properties MSP.
|
|
void
|
|
add_merge_section(const Merge_section_properties& msp,
|
|
Output_merge_base* pomb)
|
|
{
|
|
std::pair<Merge_section_properties, Output_merge_base*> value(msp, pomb);
|
|
std::pair<Merge_sections_by_properties::iterator, bool> result =
|
|
this->merge_sections_by_properties_.insert(value);
|
|
gold_assert(result.second);
|
|
}
|
|
|
|
// Add a mapping from a merged input section in OBJECT with index SHNDX
|
|
// to a merge output section pointed by POMB.
|
|
void
|
|
add_merge_input_section(const Object* object, unsigned int shndx,
|
|
Output_merge_base* pomb)
|
|
{
|
|
Const_section_id csid(object, shndx);
|
|
std::pair<Const_section_id, Output_merge_base*> value(csid, pomb);
|
|
std::pair<Merge_sections_by_id::iterator, bool> result =
|
|
this->merge_sections_by_id_.insert(value);
|
|
gold_assert(result.second);
|
|
}
|
|
|
|
// Find a relaxed input section of OBJECT with index SHNDX.
|
|
Output_relaxed_input_section*
|
|
find_relaxed_input_section(const Object* object, unsigned int shndx) const
|
|
{
|
|
gold_assert(this->is_valid_);
|
|
Relaxed_input_sections_by_id::const_iterator p =
|
|
this->relaxed_input_sections_by_id_.find(Const_section_id(object, shndx));
|
|
return p != this->relaxed_input_sections_by_id_.end() ? p->second : NULL;
|
|
}
|
|
|
|
// Add a relaxed input section pointed by POMB and whose original input
|
|
// section is in OBJECT with index SHNDX.
|
|
void
|
|
add_relaxed_input_section(const Relobj* relobj, unsigned int shndx,
|
|
Output_relaxed_input_section* poris)
|
|
{
|
|
Const_section_id csid(relobj, shndx);
|
|
std::pair<Const_section_id, Output_relaxed_input_section*>
|
|
value(csid, poris);
|
|
std::pair<Relaxed_input_sections_by_id::iterator, bool> result =
|
|
this->relaxed_input_sections_by_id_.insert(value);
|
|
gold_assert(result.second);
|
|
}
|
|
|
|
private:
|
|
typedef Unordered_map<Const_section_id, Output_merge_base*,
|
|
Const_section_id_hash>
|
|
Merge_sections_by_id;
|
|
|
|
typedef Unordered_map<Merge_section_properties, Output_merge_base*,
|
|
Merge_section_properties::hash,
|
|
Merge_section_properties::equal_to>
|
|
Merge_sections_by_properties;
|
|
|
|
typedef Unordered_map<Const_section_id, Output_relaxed_input_section*,
|
|
Const_section_id_hash>
|
|
Relaxed_input_sections_by_id;
|
|
|
|
// Whether this is valid
|
|
bool is_valid_;
|
|
// Merge sections by merge section properties.
|
|
Merge_sections_by_properties merge_sections_by_properties_;
|
|
// Merge sections by section IDs.
|
|
Merge_sections_by_id merge_sections_by_id_;
|
|
// Relaxed sections by section IDs.
|
|
Relaxed_input_sections_by_id relaxed_input_sections_by_id_;
|
|
};
|
|
|
|
// This abstract base class defines the interface for the
|
|
// types of methods used to fill free space left in an output
|
|
// section during an incremental link. These methods are used
|
|
// to insert dummy compilation units into debug info so that
|
|
// debug info consumers can scan the debug info serially.
|
|
|
|
class Output_fill
|
|
{
|
|
public:
|
|
Output_fill()
|
|
: is_big_endian_(parameters->target().is_big_endian())
|
|
{ }
|
|
|
|
virtual
|
|
~Output_fill()
|
|
{ }
|
|
|
|
// Return the smallest size chunk of free space that can be
|
|
// filled with a dummy compilation unit.
|
|
size_t
|
|
minimum_hole_size() const
|
|
{ return this->do_minimum_hole_size(); }
|
|
|
|
// Write a fill pattern of length LEN at offset OFF in the file.
|
|
void
|
|
write(Output_file* of, off_t off, size_t len) const
|
|
{ this->do_write(of, off, len); }
|
|
|
|
protected:
|
|
virtual size_t
|
|
do_minimum_hole_size() const = 0;
|
|
|
|
virtual void
|
|
do_write(Output_file* of, off_t off, size_t len) const = 0;
|
|
|
|
bool
|
|
is_big_endian() const
|
|
{ return this->is_big_endian_; }
|
|
|
|
private:
|
|
bool is_big_endian_;
|
|
};
|
|
|
|
// Fill method that introduces a dummy compilation unit in
|
|
// a .debug_info or .debug_types section.
|
|
|
|
class Output_fill_debug_info : public Output_fill
|
|
{
|
|
public:
|
|
Output_fill_debug_info(bool is_debug_types)
|
|
: is_debug_types_(is_debug_types)
|
|
{ }
|
|
|
|
protected:
|
|
virtual size_t
|
|
do_minimum_hole_size() const;
|
|
|
|
virtual void
|
|
do_write(Output_file* of, off_t off, size_t len) const;
|
|
|
|
private:
|
|
// Version of the header.
|
|
static const int version = 4;
|
|
// True if this is a .debug_types section.
|
|
bool is_debug_types_;
|
|
};
|
|
|
|
// Fill method that introduces a dummy compilation unit in
|
|
// a .debug_line section.
|
|
|
|
class Output_fill_debug_line : public Output_fill
|
|
{
|
|
public:
|
|
Output_fill_debug_line()
|
|
{ }
|
|
|
|
protected:
|
|
virtual size_t
|
|
do_minimum_hole_size() const;
|
|
|
|
virtual void
|
|
do_write(Output_file* of, off_t off, size_t len) const;
|
|
|
|
private:
|
|
// Version of the header. We write a DWARF-3 header because it's smaller
|
|
// and many tools have not yet been updated to understand the DWARF-4 header.
|
|
static const int version = 3;
|
|
// Length of the portion of the header that follows the header_length
|
|
// field. This includes the following fields:
|
|
// minimum_instruction_length, default_is_stmt, line_base, line_range,
|
|
// opcode_base, standard_opcode_lengths[], include_directories, filenames.
|
|
// The standard_opcode_lengths array is 12 bytes long, and the
|
|
// include_directories and filenames fields each contain only a single
|
|
// null byte.
|
|
static const size_t header_length = 19;
|
|
};
|
|
|
|
// An output section. We don't expect to have too many output
|
|
// sections, so we don't bother to do a template on the size.
|
|
|
|
class Output_section : public Output_data
|
|
{
|
|
public:
|
|
// Create an output section, giving the name, type, and flags.
|
|
Output_section(const char* name, elfcpp::Elf_Word, elfcpp::Elf_Xword);
|
|
virtual ~Output_section();
|
|
|
|
// Add a new input section SHNDX, named NAME, with header SHDR, from
|
|
// object OBJECT. RELOC_SHNDX is the index of a relocation section
|
|
// which applies to this section, or 0 if none, or -1 if more than
|
|
// one. HAVE_SECTIONS_SCRIPT is true if we have a SECTIONS clause
|
|
// in a linker script; in that case we need to keep track of input
|
|
// sections associated with an output section. Return the offset
|
|
// within the output section.
|
|
template<int size, bool big_endian>
|
|
off_t
|
|
add_input_section(Layout* layout, Sized_relobj_file<size, big_endian>* object,
|
|
unsigned int shndx, const char* name,
|
|
const elfcpp::Shdr<size, big_endian>& shdr,
|
|
unsigned int reloc_shndx, bool have_sections_script);
|
|
|
|
// Add generated data POSD to this output section.
|
|
void
|
|
add_output_section_data(Output_section_data* posd);
|
|
|
|
// Add a relaxed input section PORIS called NAME to this output section
|
|
// with LAYOUT.
|
|
void
|
|
add_relaxed_input_section(Layout* layout,
|
|
Output_relaxed_input_section* poris,
|
|
const std::string& name);
|
|
|
|
// Return the section name.
|
|
const char*
|
|
name() const
|
|
{ return this->name_; }
|
|
|
|
// Return the section type.
|
|
elfcpp::Elf_Word
|
|
type() const
|
|
{ return this->type_; }
|
|
|
|
// Return the section flags.
|
|
elfcpp::Elf_Xword
|
|
flags() const
|
|
{ return this->flags_; }
|
|
|
|
typedef std::map<Section_id, unsigned int> Section_layout_order;
|
|
|
|
void
|
|
update_section_layout(const Section_layout_order* order_map);
|
|
|
|
// Update the output section flags based on input section flags.
|
|
void
|
|
update_flags_for_input_section(elfcpp::Elf_Xword flags);
|
|
|
|
// Return the entsize field.
|
|
uint64_t
|
|
entsize() const
|
|
{ return this->entsize_; }
|
|
|
|
// Set the entsize field.
|
|
void
|
|
set_entsize(uint64_t v);
|
|
|
|
// Set the load address.
|
|
void
|
|
set_load_address(uint64_t load_address)
|
|
{
|
|
this->load_address_ = load_address;
|
|
this->has_load_address_ = true;
|
|
}
|
|
|
|
// Set the link field to the output section index of a section.
|
|
void
|
|
set_link_section(const Output_data* od)
|
|
{
|
|
gold_assert(this->link_ == 0
|
|
&& !this->should_link_to_symtab_
|
|
&& !this->should_link_to_dynsym_);
|
|
this->link_section_ = od;
|
|
}
|
|
|
|
// Set the link field to a constant.
|
|
void
|
|
set_link(unsigned int v)
|
|
{
|
|
gold_assert(this->link_section_ == NULL
|
|
&& !this->should_link_to_symtab_
|
|
&& !this->should_link_to_dynsym_);
|
|
this->link_ = v;
|
|
}
|
|
|
|
// Record that this section should link to the normal symbol table.
|
|
void
|
|
set_should_link_to_symtab()
|
|
{
|
|
gold_assert(this->link_section_ == NULL
|
|
&& this->link_ == 0
|
|
&& !this->should_link_to_dynsym_);
|
|
this->should_link_to_symtab_ = true;
|
|
}
|
|
|
|
// Record that this section should link to the dynamic symbol table.
|
|
void
|
|
set_should_link_to_dynsym()
|
|
{
|
|
gold_assert(this->link_section_ == NULL
|
|
&& this->link_ == 0
|
|
&& !this->should_link_to_symtab_);
|
|
this->should_link_to_dynsym_ = true;
|
|
}
|
|
|
|
// Return the info field.
|
|
unsigned int
|
|
info() const
|
|
{
|
|
gold_assert(this->info_section_ == NULL
|
|
&& this->info_symndx_ == NULL);
|
|
return this->info_;
|
|
}
|
|
|
|
// Set the info field to the output section index of a section.
|
|
void
|
|
set_info_section(const Output_section* os)
|
|
{
|
|
gold_assert((this->info_section_ == NULL
|
|
|| (this->info_section_ == os
|
|
&& this->info_uses_section_index_))
|
|
&& this->info_symndx_ == NULL
|
|
&& this->info_ == 0);
|
|
this->info_section_ = os;
|
|
this->info_uses_section_index_= true;
|
|
}
|
|
|
|
// Set the info field to the symbol table index of a symbol.
|
|
void
|
|
set_info_symndx(const Symbol* sym)
|
|
{
|
|
gold_assert(this->info_section_ == NULL
|
|
&& (this->info_symndx_ == NULL
|
|
|| this->info_symndx_ == sym)
|
|
&& this->info_ == 0);
|
|
this->info_symndx_ = sym;
|
|
}
|
|
|
|
// Set the info field to the symbol table index of a section symbol.
|
|
void
|
|
set_info_section_symndx(const Output_section* os)
|
|
{
|
|
gold_assert((this->info_section_ == NULL
|
|
|| (this->info_section_ == os
|
|
&& !this->info_uses_section_index_))
|
|
&& this->info_symndx_ == NULL
|
|
&& this->info_ == 0);
|
|
this->info_section_ = os;
|
|
this->info_uses_section_index_ = false;
|
|
}
|
|
|
|
// Set the info field to a constant.
|
|
void
|
|
set_info(unsigned int v)
|
|
{
|
|
gold_assert(this->info_section_ == NULL
|
|
&& this->info_symndx_ == NULL
|
|
&& (this->info_ == 0
|
|
|| this->info_ == v));
|
|
this->info_ = v;
|
|
}
|
|
|
|
// Set the addralign field.
|
|
void
|
|
set_addralign(uint64_t v)
|
|
{ this->addralign_ = v; }
|
|
|
|
void
|
|
checkpoint_set_addralign(uint64_t val)
|
|
{
|
|
if (this->checkpoint_ != NULL)
|
|
this->checkpoint_->set_addralign(val);
|
|
}
|
|
|
|
// Whether the output section index has been set.
|
|
bool
|
|
has_out_shndx() const
|
|
{ return this->out_shndx_ != -1U; }
|
|
|
|
// Indicate that we need a symtab index.
|
|
void
|
|
set_needs_symtab_index()
|
|
{ this->needs_symtab_index_ = true; }
|
|
|
|
// Return whether we need a symtab index.
|
|
bool
|
|
needs_symtab_index() const
|
|
{ return this->needs_symtab_index_; }
|
|
|
|
// Get the symtab index.
|
|
unsigned int
|
|
symtab_index() const
|
|
{
|
|
gold_assert(this->symtab_index_ != 0);
|
|
return this->symtab_index_;
|
|
}
|
|
|
|
// Set the symtab index.
|
|
void
|
|
set_symtab_index(unsigned int index)
|
|
{
|
|
gold_assert(index != 0);
|
|
this->symtab_index_ = index;
|
|
}
|
|
|
|
// Indicate that we need a dynsym index.
|
|
void
|
|
set_needs_dynsym_index()
|
|
{ this->needs_dynsym_index_ = true; }
|
|
|
|
// Return whether we need a dynsym index.
|
|
bool
|
|
needs_dynsym_index() const
|
|
{ return this->needs_dynsym_index_; }
|
|
|
|
// Get the dynsym index.
|
|
unsigned int
|
|
dynsym_index() const
|
|
{
|
|
gold_assert(this->dynsym_index_ != 0);
|
|
return this->dynsym_index_;
|
|
}
|
|
|
|
// Set the dynsym index.
|
|
void
|
|
set_dynsym_index(unsigned int index)
|
|
{
|
|
gold_assert(index != 0);
|
|
this->dynsym_index_ = index;
|
|
}
|
|
|
|
// Sort the attached input sections.
|
|
void
|
|
sort_attached_input_sections();
|
|
|
|
// Return whether the input sections sections attachd to this output
|
|
// section may require sorting. This is used to handle constructor
|
|
// priorities compatibly with GNU ld.
|
|
bool
|
|
may_sort_attached_input_sections() const
|
|
{ return this->may_sort_attached_input_sections_; }
|
|
|
|
// Record that the input sections attached to this output section
|
|
// may require sorting.
|
|
void
|
|
set_may_sort_attached_input_sections()
|
|
{ this->may_sort_attached_input_sections_ = true; }
|
|
|
|
// Returns true if input sections must be sorted according to the
|
|
// order in which their name appear in the --section-ordering-file.
|
|
bool
|
|
input_section_order_specified()
|
|
{ return this->input_section_order_specified_; }
|
|
|
|
// Record that input sections must be sorted as some of their names
|
|
// match the patterns specified through --section-ordering-file.
|
|
void
|
|
set_input_section_order_specified()
|
|
{ this->input_section_order_specified_ = true; }
|
|
|
|
// Return whether the input sections attached to this output section
|
|
// require sorting. This is used to handle constructor priorities
|
|
// compatibly with GNU ld.
|
|
bool
|
|
must_sort_attached_input_sections() const
|
|
{ return this->must_sort_attached_input_sections_; }
|
|
|
|
// Record that the input sections attached to this output section
|
|
// require sorting.
|
|
void
|
|
set_must_sort_attached_input_sections()
|
|
{ this->must_sort_attached_input_sections_ = true; }
|
|
|
|
// Get the order in which this section appears in the PT_LOAD output
|
|
// segment.
|
|
Output_section_order
|
|
order() const
|
|
{ return this->order_; }
|
|
|
|
// Set the order for this section.
|
|
void
|
|
set_order(Output_section_order order)
|
|
{ this->order_ = order; }
|
|
|
|
// Return whether this section holds relro data--data which has
|
|
// dynamic relocations but which may be marked read-only after the
|
|
// dynamic relocations have been completed.
|
|
bool
|
|
is_relro() const
|
|
{ return this->is_relro_; }
|
|
|
|
// Record that this section holds relro data.
|
|
void
|
|
set_is_relro()
|
|
{ this->is_relro_ = true; }
|
|
|
|
// Record that this section does not hold relro data.
|
|
void
|
|
clear_is_relro()
|
|
{ this->is_relro_ = false; }
|
|
|
|
// True if this is a small section: a section which holds small
|
|
// variables.
|
|
bool
|
|
is_small_section() const
|
|
{ return this->is_small_section_; }
|
|
|
|
// Record that this is a small section.
|
|
void
|
|
set_is_small_section()
|
|
{ this->is_small_section_ = true; }
|
|
|
|
// True if this is a large section: a section which holds large
|
|
// variables.
|
|
bool
|
|
is_large_section() const
|
|
{ return this->is_large_section_; }
|
|
|
|
// Record that this is a large section.
|
|
void
|
|
set_is_large_section()
|
|
{ this->is_large_section_ = true; }
|
|
|
|
// True if this is a large data (not BSS) section.
|
|
bool
|
|
is_large_data_section()
|
|
{ return this->is_large_section_ && this->type_ != elfcpp::SHT_NOBITS; }
|
|
|
|
// Return whether this section should be written after all the input
|
|
// sections are complete.
|
|
bool
|
|
after_input_sections() const
|
|
{ return this->after_input_sections_; }
|
|
|
|
// Record that this section should be written after all the input
|
|
// sections are complete.
|
|
void
|
|
set_after_input_sections()
|
|
{ this->after_input_sections_ = true; }
|
|
|
|
// Return whether this section requires postprocessing after all
|
|
// relocations have been applied.
|
|
bool
|
|
requires_postprocessing() const
|
|
{ return this->requires_postprocessing_; }
|
|
|
|
bool
|
|
is_unique_segment() const
|
|
{ return this->is_unique_segment_; }
|
|
|
|
void
|
|
set_is_unique_segment()
|
|
{ this->is_unique_segment_ = true; }
|
|
|
|
uint64_t extra_segment_flags() const
|
|
{ return this->extra_segment_flags_; }
|
|
|
|
void
|
|
set_extra_segment_flags(uint64_t flags)
|
|
{ this->extra_segment_flags_ = flags; }
|
|
|
|
uint64_t segment_alignment() const
|
|
{ return this->segment_alignment_; }
|
|
|
|
void
|
|
set_segment_alignment(uint64_t align)
|
|
{ this->segment_alignment_ = align; }
|
|
|
|
// If a section requires postprocessing, return the buffer to use.
|
|
unsigned char*
|
|
postprocessing_buffer() const
|
|
{
|
|
gold_assert(this->postprocessing_buffer_ != NULL);
|
|
return this->postprocessing_buffer_;
|
|
}
|
|
|
|
// If a section requires postprocessing, create the buffer to use.
|
|
void
|
|
create_postprocessing_buffer();
|
|
|
|
// If a section requires postprocessing, this is the size of the
|
|
// buffer to which relocations should be applied.
|
|
off_t
|
|
postprocessing_buffer_size() const
|
|
{ return this->current_data_size_for_child(); }
|
|
|
|
// Modify the section name. This is only permitted for an
|
|
// unallocated section, and only before the size has been finalized.
|
|
// Otherwise the name will not get into Layout::namepool_.
|
|
void
|
|
set_name(const char* newname)
|
|
{
|
|
gold_assert((this->flags_ & elfcpp::SHF_ALLOC) == 0);
|
|
gold_assert(!this->is_data_size_valid());
|
|
this->name_ = newname;
|
|
}
|
|
|
|
// Return whether the offset OFFSET in the input section SHNDX in
|
|
// object OBJECT is being included in the link.
|
|
bool
|
|
is_input_address_mapped(const Relobj* object, unsigned int shndx,
|
|
off_t offset) const;
|
|
|
|
// Return the offset within the output section of OFFSET relative to
|
|
// the start of input section SHNDX in object OBJECT.
|
|
section_offset_type
|
|
output_offset(const Relobj* object, unsigned int shndx,
|
|
section_offset_type offset) const;
|
|
|
|
// Return the output virtual address of OFFSET relative to the start
|
|
// of input section SHNDX in object OBJECT.
|
|
uint64_t
|
|
output_address(const Relobj* object, unsigned int shndx,
|
|
off_t offset) const;
|
|
|
|
// Look for the merged section for input section SHNDX in object
|
|
// OBJECT. If found, return true, and set *ADDR to the address of
|
|
// the start of the merged section. This is not necessary the
|
|
// output offset corresponding to input offset 0 in the section,
|
|
// since the section may be mapped arbitrarily.
|
|
bool
|
|
find_starting_output_address(const Relobj* object, unsigned int shndx,
|
|
uint64_t* addr) const;
|
|
|
|
// Record that this output section was found in the SECTIONS clause
|
|
// of a linker script.
|
|
void
|
|
set_found_in_sections_clause()
|
|
{ this->found_in_sections_clause_ = true; }
|
|
|
|
// Return whether this output section was found in the SECTIONS
|
|
// clause of a linker script.
|
|
bool
|
|
found_in_sections_clause() const
|
|
{ return this->found_in_sections_clause_; }
|
|
|
|
// Write the section header into *OPHDR.
|
|
template<int size, bool big_endian>
|
|
void
|
|
write_header(const Layout*, const Stringpool*,
|
|
elfcpp::Shdr_write<size, big_endian>*) const;
|
|
|
|
// The next few calls are for linker script support.
|
|
|
|
// In some cases we need to keep a list of the input sections
|
|
// associated with this output section. We only need the list if we
|
|
// might have to change the offsets of the input section within the
|
|
// output section after we add the input section. The ordinary
|
|
// input sections will be written out when we process the object
|
|
// file, and as such we don't need to track them here. We do need
|
|
// to track Output_section_data objects here. We store instances of
|
|
// this structure in a std::vector, so it must be a POD. There can
|
|
// be many instances of this structure, so we use a union to save
|
|
// some space.
|
|
class Input_section
|
|
{
|
|
public:
|
|
Input_section()
|
|
: shndx_(0), p2align_(0)
|
|
{
|
|
this->u1_.data_size = 0;
|
|
this->u2_.object = NULL;
|
|
}
|
|
|
|
// For an ordinary input section.
|
|
Input_section(Relobj* object, unsigned int shndx, off_t data_size,
|
|
uint64_t addralign)
|
|
: shndx_(shndx),
|
|
p2align_(ffsll(static_cast<long long>(addralign))),
|
|
section_order_index_(0)
|
|
{
|
|
gold_assert(shndx != OUTPUT_SECTION_CODE
|
|
&& shndx != MERGE_DATA_SECTION_CODE
|
|
&& shndx != MERGE_STRING_SECTION_CODE
|
|
&& shndx != RELAXED_INPUT_SECTION_CODE);
|
|
this->u1_.data_size = data_size;
|
|
this->u2_.object = object;
|
|
}
|
|
|
|
// For a non-merge output section.
|
|
Input_section(Output_section_data* posd)
|
|
: shndx_(OUTPUT_SECTION_CODE), p2align_(0),
|
|
section_order_index_(0)
|
|
{
|
|
this->u1_.data_size = 0;
|
|
this->u2_.posd = posd;
|
|
}
|
|
|
|
// For a merge section.
|
|
Input_section(Output_section_data* posd, bool is_string, uint64_t entsize)
|
|
: shndx_(is_string
|
|
? MERGE_STRING_SECTION_CODE
|
|
: MERGE_DATA_SECTION_CODE),
|
|
p2align_(0),
|
|
section_order_index_(0)
|
|
{
|
|
this->u1_.entsize = entsize;
|
|
this->u2_.posd = posd;
|
|
}
|
|
|
|
// For a relaxed input section.
|
|
Input_section(Output_relaxed_input_section* psection)
|
|
: shndx_(RELAXED_INPUT_SECTION_CODE), p2align_(0),
|
|
section_order_index_(0)
|
|
{
|
|
this->u1_.data_size = 0;
|
|
this->u2_.poris = psection;
|
|
}
|
|
|
|
unsigned int
|
|
section_order_index() const
|
|
{
|
|
return this->section_order_index_;
|
|
}
|
|
|
|
void
|
|
set_section_order_index(unsigned int number)
|
|
{
|
|
this->section_order_index_ = number;
|
|
}
|
|
|
|
// The required alignment.
|
|
uint64_t
|
|
addralign() const
|
|
{
|
|
if (this->p2align_ != 0)
|
|
return static_cast<uint64_t>(1) << (this->p2align_ - 1);
|
|
else if (!this->is_input_section())
|
|
return this->u2_.posd->addralign();
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
// Set the required alignment, which must be either 0 or a power of 2.
|
|
// For input sections that are sub-classes of Output_section_data, a
|
|
// alignment of zero means asking the underlying object for alignment.
|
|
void
|
|
set_addralign(uint64_t addralign)
|
|
{
|
|
if (addralign == 0)
|
|
this->p2align_ = 0;
|
|
else
|
|
{
|
|
gold_assert((addralign & (addralign - 1)) == 0);
|
|
this->p2align_ = ffsll(static_cast<long long>(addralign));
|
|
}
|
|
}
|
|
|
|
// Return the current required size, without finalization.
|
|
off_t
|
|
current_data_size() const;
|
|
|
|
// Return the required size.
|
|
off_t
|
|
data_size() const;
|
|
|
|
// Whether this is an input section.
|
|
bool
|
|
is_input_section() const
|
|
{
|
|
return (this->shndx_ != OUTPUT_SECTION_CODE
|
|
&& this->shndx_ != MERGE_DATA_SECTION_CODE
|
|
&& this->shndx_ != MERGE_STRING_SECTION_CODE
|
|
&& this->shndx_ != RELAXED_INPUT_SECTION_CODE);
|
|
}
|
|
|
|
// Return whether this is a merge section which matches the
|
|
// parameters.
|
|
bool
|
|
is_merge_section(bool is_string, uint64_t entsize,
|
|
uint64_t addralign) const
|
|
{
|
|
return (this->shndx_ == (is_string
|
|
? MERGE_STRING_SECTION_CODE
|
|
: MERGE_DATA_SECTION_CODE)
|
|
&& this->u1_.entsize == entsize
|
|
&& this->addralign() == addralign);
|
|
}
|
|
|
|
// Return whether this is a merge section for some input section.
|
|
bool
|
|
is_merge_section() const
|
|
{
|
|
return (this->shndx_ == MERGE_DATA_SECTION_CODE
|
|
|| this->shndx_ == MERGE_STRING_SECTION_CODE);
|
|
}
|
|
|
|
// Return whether this is a relaxed input section.
|
|
bool
|
|
is_relaxed_input_section() const
|
|
{ return this->shndx_ == RELAXED_INPUT_SECTION_CODE; }
|
|
|
|
// Return whether this is a generic Output_section_data.
|
|
bool
|
|
is_output_section_data() const
|
|
{
|
|
return this->shndx_ == OUTPUT_SECTION_CODE;
|
|
}
|
|
|
|
// Return the object for an input section.
|
|
Relobj*
|
|
relobj() const;
|
|
|
|
// Return the input section index for an input section.
|
|
unsigned int
|
|
shndx() const;
|
|
|
|
// For non-input-sections, return the associated Output_section_data
|
|
// object.
|
|
Output_section_data*
|
|
output_section_data() const
|
|
{
|
|
gold_assert(!this->is_input_section());
|
|
return this->u2_.posd;
|
|
}
|
|
|
|
// For a merge section, return the Output_merge_base pointer.
|
|
Output_merge_base*
|
|
output_merge_base() const
|
|
{
|
|
gold_assert(this->is_merge_section());
|
|
return this->u2_.pomb;
|
|
}
|
|
|
|
// Return the Output_relaxed_input_section object.
|
|
Output_relaxed_input_section*
|
|
relaxed_input_section() const
|
|
{
|
|
gold_assert(this->is_relaxed_input_section());
|
|
return this->u2_.poris;
|
|
}
|
|
|
|
// Set the output section.
|
|
void
|
|
set_output_section(Output_section* os)
|
|
{
|
|
gold_assert(!this->is_input_section());
|
|
Output_section_data* posd =
|
|
this->is_relaxed_input_section() ? this->u2_.poris : this->u2_.posd;
|
|
posd->set_output_section(os);
|
|
}
|
|
|
|
// Set the address and file offset. This is called during
|
|
// Layout::finalize. SECTION_FILE_OFFSET is the file offset of
|
|
// the enclosing section.
|
|
void
|
|
set_address_and_file_offset(uint64_t address, off_t file_offset,
|
|
off_t section_file_offset);
|
|
|
|
// Reset the address and file offset.
|
|
void
|
|
reset_address_and_file_offset();
|
|
|
|
// Finalize the data size.
|
|
void
|
|
finalize_data_size();
|
|
|
|
// Add an input section, for SHF_MERGE sections.
|
|
bool
|
|
add_input_section(Relobj* object, unsigned int shndx)
|
|
{
|
|
gold_assert(this->shndx_ == MERGE_DATA_SECTION_CODE
|
|
|| this->shndx_ == MERGE_STRING_SECTION_CODE);
|
|
return this->u2_.posd->add_input_section(object, shndx);
|
|
}
|
|
|
|
// Given an input OBJECT, an input section index SHNDX within that
|
|
// object, and an OFFSET relative to the start of that input
|
|
// section, return whether or not the output offset is known. If
|
|
// this function returns true, it sets *POUTPUT to the offset in
|
|
// the output section, relative to the start of the input section
|
|
// in the output section. *POUTPUT may be different from OFFSET
|
|
// for a merged section.
|
|
bool
|
|
output_offset(const Relobj* object, unsigned int shndx,
|
|
section_offset_type offset,
|
|
section_offset_type* poutput) const;
|
|
|
|
// Return whether this is the merge section for the input section
|
|
// SHNDX in OBJECT.
|
|
bool
|
|
is_merge_section_for(const Relobj* object, unsigned int shndx) const;
|
|
|
|
// Write out the data. This does nothing for an input section.
|
|
void
|
|
write(Output_file*);
|
|
|
|
// Write the data to a buffer. This does nothing for an input
|
|
// section.
|
|
void
|
|
write_to_buffer(unsigned char*);
|
|
|
|
// Print to a map file.
|
|
void
|
|
print_to_mapfile(Mapfile*) const;
|
|
|
|
// Print statistics about merge sections to stderr.
|
|
void
|
|
print_merge_stats(const char* section_name)
|
|
{
|
|
if (this->shndx_ == MERGE_DATA_SECTION_CODE
|
|
|| this->shndx_ == MERGE_STRING_SECTION_CODE)
|
|
this->u2_.posd->print_merge_stats(section_name);
|
|
}
|
|
|
|
private:
|
|
// Code values which appear in shndx_. If the value is not one of
|
|
// these codes, it is the input section index in the object file.
|
|
enum
|
|
{
|
|
// An Output_section_data.
|
|
OUTPUT_SECTION_CODE = -1U,
|
|
// An Output_section_data for an SHF_MERGE section with
|
|
// SHF_STRINGS not set.
|
|
MERGE_DATA_SECTION_CODE = -2U,
|
|
// An Output_section_data for an SHF_MERGE section with
|
|
// SHF_STRINGS set.
|
|
MERGE_STRING_SECTION_CODE = -3U,
|
|
// An Output_section_data for a relaxed input section.
|
|
RELAXED_INPUT_SECTION_CODE = -4U
|
|
};
|
|
|
|
// For an ordinary input section, this is the section index in the
|
|
// input file. For an Output_section_data, this is
|
|
// OUTPUT_SECTION_CODE or MERGE_DATA_SECTION_CODE or
|
|
// MERGE_STRING_SECTION_CODE.
|
|
unsigned int shndx_;
|
|
// The required alignment, stored as a power of 2.
|
|
unsigned int p2align_;
|
|
union
|
|
{
|
|
// For an ordinary input section, the section size.
|
|
off_t data_size;
|
|
// For OUTPUT_SECTION_CODE or RELAXED_INPUT_SECTION_CODE, this is not
|
|
// used. For MERGE_DATA_SECTION_CODE or MERGE_STRING_SECTION_CODE, the
|
|
// entity size.
|
|
uint64_t entsize;
|
|
} u1_;
|
|
union
|
|
{
|
|
// For an ordinary input section, the object which holds the
|
|
// input section.
|
|
Relobj* object;
|
|
// For OUTPUT_SECTION_CODE or MERGE_DATA_SECTION_CODE or
|
|
// MERGE_STRING_SECTION_CODE, the data.
|
|
Output_section_data* posd;
|
|
Output_merge_base* pomb;
|
|
// For RELAXED_INPUT_SECTION_CODE, the data.
|
|
Output_relaxed_input_section* poris;
|
|
} u2_;
|
|
// The line number of the pattern it matches in the --section-ordering-file
|
|
// file. It is 0 if does not match any pattern.
|
|
unsigned int section_order_index_;
|
|
};
|
|
|
|
// Store the list of input sections for this Output_section into the
|
|
// list passed in. This removes the input sections, leaving only
|
|
// any Output_section_data elements. This returns the size of those
|
|
// Output_section_data elements. ADDRESS is the address of this
|
|
// output section. FILL is the fill value to use, in case there are
|
|
// any spaces between the remaining Output_section_data elements.
|
|
uint64_t
|
|
get_input_sections(uint64_t address, const std::string& fill,
|
|
std::list<Input_section>*);
|
|
|
|
// Add a script input section. A script input section can either be
|
|
// a plain input section or a sub-class of Output_section_data.
|
|
void
|
|
add_script_input_section(const Input_section& input_section);
|
|
|
|
// Set the current size of the output section.
|
|
void
|
|
set_current_data_size(off_t size)
|
|
{ this->set_current_data_size_for_child(size); }
|
|
|
|
// End of linker script support.
|
|
|
|
// Save states before doing section layout.
|
|
// This is used for relaxation.
|
|
void
|
|
save_states();
|
|
|
|
// Restore states prior to section layout.
|
|
void
|
|
restore_states();
|
|
|
|
// Discard states.
|
|
void
|
|
discard_states();
|
|
|
|
// Convert existing input sections to relaxed input sections.
|
|
void
|
|
convert_input_sections_to_relaxed_sections(
|
|
const std::vector<Output_relaxed_input_section*>& sections);
|
|
|
|
// Find a relaxed input section to an input section in OBJECT
|
|
// with index SHNDX. Return NULL if none is found.
|
|
const Output_relaxed_input_section*
|
|
find_relaxed_input_section(const Relobj* object, unsigned int shndx) const;
|
|
|
|
// Whether section offsets need adjustment due to relaxation.
|
|
bool
|
|
section_offsets_need_adjustment() const
|
|
{ return this->section_offsets_need_adjustment_; }
|
|
|
|
// Set section_offsets_need_adjustment to be true.
|
|
void
|
|
set_section_offsets_need_adjustment()
|
|
{ this->section_offsets_need_adjustment_ = true; }
|
|
|
|
// Set section_offsets_need_adjustment to be false.
|
|
void
|
|
clear_section_offsets_need_adjustment()
|
|
{ this->section_offsets_need_adjustment_ = false; }
|
|
|
|
// Adjust section offsets of input sections in this. This is
|
|
// requires if relaxation caused some input sections to change sizes.
|
|
void
|
|
adjust_section_offsets();
|
|
|
|
// Whether this is a NOLOAD section.
|
|
bool
|
|
is_noload() const
|
|
{ return this->is_noload_; }
|
|
|
|
// Set NOLOAD flag.
|
|
void
|
|
set_is_noload()
|
|
{ this->is_noload_ = true; }
|
|
|
|
// Print merge statistics to stderr.
|
|
void
|
|
print_merge_stats();
|
|
|
|
// Set a fixed layout for the section. Used for incremental update links.
|
|
void
|
|
set_fixed_layout(uint64_t sh_addr, off_t sh_offset, off_t sh_size,
|
|
uint64_t sh_addralign);
|
|
|
|
// Return TRUE if the section has a fixed layout.
|
|
bool
|
|
has_fixed_layout() const
|
|
{ return this->has_fixed_layout_; }
|
|
|
|
// Set flag to allow patch space for this section. Used for full
|
|
// incremental links.
|
|
void
|
|
set_is_patch_space_allowed()
|
|
{ this->is_patch_space_allowed_ = true; }
|
|
|
|
// Set a fill method to use for free space left in the output section
|
|
// during incremental links.
|
|
void
|
|
set_free_space_fill(Output_fill* free_space_fill)
|
|
{
|
|
this->free_space_fill_ = free_space_fill;
|
|
this->free_list_.set_min_hole_size(free_space_fill->minimum_hole_size());
|
|
}
|
|
|
|
// Reserve space within the fixed layout for the section. Used for
|
|
// incremental update links.
|
|
void
|
|
reserve(uint64_t sh_offset, uint64_t sh_size);
|
|
|
|
// Allocate space from the free list for the section. Used for
|
|
// incremental update links.
|
|
off_t
|
|
allocate(off_t len, uint64_t addralign);
|
|
|
|
typedef std::vector<Input_section> Input_section_list;
|
|
|
|
// Allow access to the input sections.
|
|
const Input_section_list&
|
|
input_sections() const
|
|
{ return this->input_sections_; }
|
|
|
|
Input_section_list&
|
|
input_sections()
|
|
{ return this->input_sections_; }
|
|
|
|
protected:
|
|
// Return the output section--i.e., the object itself.
|
|
Output_section*
|
|
do_output_section()
|
|
{ return this; }
|
|
|
|
const Output_section*
|
|
do_output_section() const
|
|
{ return this; }
|
|
|
|
// Return the section index in the output file.
|
|
unsigned int
|
|
do_out_shndx() const
|
|
{
|
|
gold_assert(this->out_shndx_ != -1U);
|
|
return this->out_shndx_;
|
|
}
|
|
|
|
// Set the output section index.
|
|
void
|
|
do_set_out_shndx(unsigned int shndx)
|
|
{
|
|
gold_assert(this->out_shndx_ == -1U || this->out_shndx_ == shndx);
|
|
this->out_shndx_ = shndx;
|
|
}
|
|
|
|
// Update the data size of the Output_section. For a typical
|
|
// Output_section, there is nothing to do, but if there are any
|
|
// Output_section_data objects we need to do a trial layout
|
|
// here.
|
|
virtual void
|
|
update_data_size();
|
|
|
|
// Set the final data size of the Output_section. For a typical
|
|
// Output_section, there is nothing to do, but if there are any
|
|
// Output_section_data objects we need to set their final addresses
|
|
// here.
|
|
virtual void
|
|
set_final_data_size();
|
|
|
|
// Reset the address and file offset.
|
|
void
|
|
do_reset_address_and_file_offset();
|
|
|
|
// Return true if address and file offset already have reset values. In
|
|
// other words, calling reset_address_and_file_offset will not change them.
|
|
bool
|
|
do_address_and_file_offset_have_reset_values() const;
|
|
|
|
// Write the data to the file. For a typical Output_section, this
|
|
// does nothing: the data is written out by calling Object::Relocate
|
|
// on each input object. But if there are any Output_section_data
|
|
// objects we do need to write them out here.
|
|
virtual void
|
|
do_write(Output_file*);
|
|
|
|
// Return the address alignment--function required by parent class.
|
|
uint64_t
|
|
do_addralign() const
|
|
{ return this->addralign_; }
|
|
|
|
// Return whether there is a load address.
|
|
bool
|
|
do_has_load_address() const
|
|
{ return this->has_load_address_; }
|
|
|
|
// Return the load address.
|
|
uint64_t
|
|
do_load_address() const
|
|
{
|
|
gold_assert(this->has_load_address_);
|
|
return this->load_address_;
|
|
}
|
|
|
|
// Return whether this is an Output_section.
|
|
bool
|
|
do_is_section() const
|
|
{ return true; }
|
|
|
|
// Return whether this is a section of the specified type.
|
|
bool
|
|
do_is_section_type(elfcpp::Elf_Word type) const
|
|
{ return this->type_ == type; }
|
|
|
|
// Return whether the specified section flag is set.
|
|
bool
|
|
do_is_section_flag_set(elfcpp::Elf_Xword flag) const
|
|
{ return (this->flags_ & flag) != 0; }
|
|
|
|
// Set the TLS offset. Called only for SHT_TLS sections.
|
|
void
|
|
do_set_tls_offset(uint64_t tls_base);
|
|
|
|
// Return the TLS offset, relative to the base of the TLS segment.
|
|
// Valid only for SHT_TLS sections.
|
|
uint64_t
|
|
do_tls_offset() const
|
|
{ return this->tls_offset_; }
|
|
|
|
// This may be implemented by a child class.
|
|
virtual void
|
|
do_finalize_name(Layout*)
|
|
{ }
|
|
|
|
// Print to the map file.
|
|
virtual void
|
|
do_print_to_mapfile(Mapfile*) const;
|
|
|
|
// Record that this section requires postprocessing after all
|
|
// relocations have been applied. This is called by a child class.
|
|
void
|
|
set_requires_postprocessing()
|
|
{
|
|
this->requires_postprocessing_ = true;
|
|
this->after_input_sections_ = true;
|
|
}
|
|
|
|
// Write all the data of an Output_section into the postprocessing
|
|
// buffer.
|
|
void
|
|
write_to_postprocessing_buffer();
|
|
|
|
// Whether this always keeps an input section list
|
|
bool
|
|
always_keeps_input_sections() const
|
|
{ return this->always_keeps_input_sections_; }
|
|
|
|
// Always keep an input section list.
|
|
void
|
|
set_always_keeps_input_sections()
|
|
{
|
|
gold_assert(this->current_data_size_for_child() == 0);
|
|
this->always_keeps_input_sections_ = true;
|
|
}
|
|
|
|
private:
|
|
// We only save enough information to undo the effects of section layout.
|
|
class Checkpoint_output_section
|
|
{
|
|
public:
|
|
Checkpoint_output_section(uint64_t addralign, elfcpp::Elf_Xword flags,
|
|
const Input_section_list& input_sections,
|
|
off_t first_input_offset,
|
|
bool attached_input_sections_are_sorted)
|
|
: addralign_(addralign), flags_(flags),
|
|
input_sections_(input_sections),
|
|
input_sections_size_(input_sections_.size()),
|
|
input_sections_copy_(), first_input_offset_(first_input_offset),
|
|
attached_input_sections_are_sorted_(attached_input_sections_are_sorted)
|
|
{ }
|
|
|
|
virtual
|
|
~Checkpoint_output_section()
|
|
{ }
|
|
|
|
// Return the address alignment.
|
|
uint64_t
|
|
addralign() const
|
|
{ return this->addralign_; }
|
|
|
|
void
|
|
set_addralign(uint64_t val)
|
|
{ this->addralign_ = val; }
|
|
|
|
// Return the section flags.
|
|
elfcpp::Elf_Xword
|
|
flags() const
|
|
{ return this->flags_; }
|
|
|
|
// Return a reference to the input section list copy.
|
|
Input_section_list*
|
|
input_sections()
|
|
{ return &this->input_sections_copy_; }
|
|
|
|
// Return the size of input_sections at the time when checkpoint is
|
|
// taken.
|
|
size_t
|
|
input_sections_size() const
|
|
{ return this->input_sections_size_; }
|
|
|
|
// Whether input sections are copied.
|
|
bool
|
|
input_sections_saved() const
|
|
{ return this->input_sections_copy_.size() == this->input_sections_size_; }
|
|
|
|
off_t
|
|
first_input_offset() const
|
|
{ return this->first_input_offset_; }
|
|
|
|
bool
|
|
attached_input_sections_are_sorted() const
|
|
{ return this->attached_input_sections_are_sorted_; }
|
|
|
|
// Save input sections.
|
|
void
|
|
save_input_sections()
|
|
{
|
|
this->input_sections_copy_.reserve(this->input_sections_size_);
|
|
this->input_sections_copy_.clear();
|
|
Input_section_list::const_iterator p = this->input_sections_.begin();
|
|
gold_assert(this->input_sections_size_ >= this->input_sections_.size());
|
|
for(size_t i = 0; i < this->input_sections_size_ ; i++, ++p)
|
|
this->input_sections_copy_.push_back(*p);
|
|
}
|
|
|
|
private:
|
|
// The section alignment.
|
|
uint64_t addralign_;
|
|
// The section flags.
|
|
elfcpp::Elf_Xword flags_;
|
|
// Reference to the input sections to be checkpointed.
|
|
const Input_section_list& input_sections_;
|
|
// Size of the checkpointed portion of input_sections_;
|
|
size_t input_sections_size_;
|
|
// Copy of input sections.
|
|
Input_section_list input_sections_copy_;
|
|
// The offset of the first entry in input_sections_.
|
|
off_t first_input_offset_;
|
|
// True if the input sections attached to this output section have
|
|
// already been sorted.
|
|
bool attached_input_sections_are_sorted_;
|
|
};
|
|
|
|
// This class is used to sort the input sections.
|
|
class Input_section_sort_entry;
|
|
|
|
// This is the sort comparison function for ctors and dtors.
|
|
struct Input_section_sort_compare
|
|
{
|
|
bool
|
|
operator()(const Input_section_sort_entry&,
|
|
const Input_section_sort_entry&) const;
|
|
};
|
|
|
|
// This is the sort comparison function for .init_array and .fini_array.
|
|
struct Input_section_sort_init_fini_compare
|
|
{
|
|
bool
|
|
operator()(const Input_section_sort_entry&,
|
|
const Input_section_sort_entry&) const;
|
|
};
|
|
|
|
// This is the sort comparison function when a section order is specified
|
|
// from an input file.
|
|
struct Input_section_sort_section_order_index_compare
|
|
{
|
|
bool
|
|
operator()(const Input_section_sort_entry&,
|
|
const Input_section_sort_entry&) const;
|
|
};
|
|
|
|
// This is the sort comparison function for .text to sort sections with
|
|
// prefixes .text.{unlikely,exit,startup,hot} before other sections.
|
|
struct Input_section_sort_section_prefix_special_ordering_compare
|
|
{
|
|
bool
|
|
operator()(const Input_section_sort_entry&,
|
|
const Input_section_sort_entry&) const;
|
|
};
|
|
|
|
// This is the sort comparison function for sorting sections by name.
|
|
struct Input_section_sort_section_name_compare
|
|
{
|
|
bool
|
|
operator()(const Input_section_sort_entry&,
|
|
const Input_section_sort_entry&) const;
|
|
};
|
|
|
|
// Fill data. This is used to fill in data between input sections.
|
|
// It is also used for data statements (BYTE, WORD, etc.) in linker
|
|
// scripts. When we have to keep track of the input sections, we
|
|
// can use an Output_data_const, but we don't want to have to keep
|
|
// track of input sections just to implement fills.
|
|
class Fill
|
|
{
|
|
public:
|
|
Fill(off_t section_offset, off_t length)
|
|
: section_offset_(section_offset),
|
|
length_(convert_to_section_size_type(length))
|
|
{ }
|
|
|
|
// Return section offset.
|
|
off_t
|
|
section_offset() const
|
|
{ return this->section_offset_; }
|
|
|
|
// Return fill length.
|
|
section_size_type
|
|
length() const
|
|
{ return this->length_; }
|
|
|
|
private:
|
|
// The offset within the output section.
|
|
off_t section_offset_;
|
|
// The length of the space to fill.
|
|
section_size_type length_;
|
|
};
|
|
|
|
typedef std::vector<Fill> Fill_list;
|
|
|
|
// Map used during relaxation of existing sections. This map
|
|
// a section id an input section list index. We assume that
|
|
// Input_section_list is a vector.
|
|
typedef Unordered_map<Section_id, size_t, Section_id_hash> Relaxation_map;
|
|
|
|
// Add a new output section by Input_section.
|
|
void
|
|
add_output_section_data(Input_section*);
|
|
|
|
// Add an SHF_MERGE input section. Returns true if the section was
|
|
// handled. If KEEPS_INPUT_SECTIONS is true, the output merge section
|
|
// stores information about the merged input sections.
|
|
bool
|
|
add_merge_input_section(Relobj* object, unsigned int shndx, uint64_t flags,
|
|
uint64_t entsize, uint64_t addralign,
|
|
bool keeps_input_sections);
|
|
|
|
// Add an output SHF_MERGE section POSD to this output section.
|
|
// IS_STRING indicates whether it is a SHF_STRINGS section, and
|
|
// ENTSIZE is the entity size. This returns the entry added to
|
|
// input_sections_.
|
|
void
|
|
add_output_merge_section(Output_section_data* posd, bool is_string,
|
|
uint64_t entsize);
|
|
|
|
// Find the merge section into which an input section with index SHNDX in
|
|
// OBJECT has been added. Return NULL if none found.
|
|
Output_section_data*
|
|
find_merge_section(const Relobj* object, unsigned int shndx) const;
|
|
|
|
// Build a relaxation map.
|
|
void
|
|
build_relaxation_map(
|
|
const Input_section_list& input_sections,
|
|
size_t limit,
|
|
Relaxation_map* map) const;
|
|
|
|
// Convert input sections in an input section list into relaxed sections.
|
|
void
|
|
convert_input_sections_in_list_to_relaxed_sections(
|
|
const std::vector<Output_relaxed_input_section*>& relaxed_sections,
|
|
const Relaxation_map& map,
|
|
Input_section_list* input_sections);
|
|
|
|
// Build the lookup maps for merge and relaxed input sections.
|
|
void
|
|
build_lookup_maps() const;
|
|
|
|
// Most of these fields are only valid after layout.
|
|
|
|
// The name of the section. This will point into a Stringpool.
|
|
const char* name_;
|
|
// The section address is in the parent class.
|
|
// The section alignment.
|
|
uint64_t addralign_;
|
|
// The section entry size.
|
|
uint64_t entsize_;
|
|
// The load address. This is only used when using a linker script
|
|
// with a SECTIONS clause. The has_load_address_ field indicates
|
|
// whether this field is valid.
|
|
uint64_t load_address_;
|
|
// The file offset is in the parent class.
|
|
// Set the section link field to the index of this section.
|
|
const Output_data* link_section_;
|
|
// If link_section_ is NULL, this is the link field.
|
|
unsigned int link_;
|
|
// Set the section info field to the index of this section.
|
|
const Output_section* info_section_;
|
|
// If info_section_ is NULL, set the info field to the symbol table
|
|
// index of this symbol.
|
|
const Symbol* info_symndx_;
|
|
// If info_section_ and info_symndx_ are NULL, this is the section
|
|
// info field.
|
|
unsigned int info_;
|
|
// The section type.
|
|
const elfcpp::Elf_Word type_;
|
|
// The section flags.
|
|
elfcpp::Elf_Xword flags_;
|
|
// The order of this section in the output segment.
|
|
Output_section_order order_;
|
|
// The section index.
|
|
unsigned int out_shndx_;
|
|
// If there is a STT_SECTION for this output section in the normal
|
|
// symbol table, this is the symbol index. This starts out as zero.
|
|
// It is initialized in Layout::finalize() to be the index, or -1U
|
|
// if there isn't one.
|
|
unsigned int symtab_index_;
|
|
// If there is a STT_SECTION for this output section in the dynamic
|
|
// symbol table, this is the symbol index. This starts out as zero.
|
|
// It is initialized in Layout::finalize() to be the index, or -1U
|
|
// if there isn't one.
|
|
unsigned int dynsym_index_;
|
|
// The input sections. This will be empty in cases where we don't
|
|
// need to keep track of them.
|
|
Input_section_list input_sections_;
|
|
// The offset of the first entry in input_sections_.
|
|
off_t first_input_offset_;
|
|
// The fill data. This is separate from input_sections_ because we
|
|
// often will need fill sections without needing to keep track of
|
|
// input sections.
|
|
Fill_list fills_;
|
|
// If the section requires postprocessing, this buffer holds the
|
|
// section contents during relocation.
|
|
unsigned char* postprocessing_buffer_;
|
|
// Whether this output section needs a STT_SECTION symbol in the
|
|
// normal symbol table. This will be true if there is a relocation
|
|
// which needs it.
|
|
bool needs_symtab_index_ : 1;
|
|
// Whether this output section needs a STT_SECTION symbol in the
|
|
// dynamic symbol table. This will be true if there is a dynamic
|
|
// relocation which needs it.
|
|
bool needs_dynsym_index_ : 1;
|
|
// Whether the link field of this output section should point to the
|
|
// normal symbol table.
|
|
bool should_link_to_symtab_ : 1;
|
|
// Whether the link field of this output section should point to the
|
|
// dynamic symbol table.
|
|
bool should_link_to_dynsym_ : 1;
|
|
// Whether this section should be written after all the input
|
|
// sections are complete.
|
|
bool after_input_sections_ : 1;
|
|
// Whether this section requires post processing after all
|
|
// relocations have been applied.
|
|
bool requires_postprocessing_ : 1;
|
|
// Whether an input section was mapped to this output section
|
|
// because of a SECTIONS clause in a linker script.
|
|
bool found_in_sections_clause_ : 1;
|
|
// Whether this section has an explicitly specified load address.
|
|
bool has_load_address_ : 1;
|
|
// True if the info_section_ field means the section index of the
|
|
// section, false if it means the symbol index of the corresponding
|
|
// section symbol.
|
|
bool info_uses_section_index_ : 1;
|
|
// True if input sections attached to this output section have to be
|
|
// sorted according to a specified order.
|
|
bool input_section_order_specified_ : 1;
|
|
// True if the input sections attached to this output section may
|
|
// need sorting.
|
|
bool may_sort_attached_input_sections_ : 1;
|
|
// True if the input sections attached to this output section must
|
|
// be sorted.
|
|
bool must_sort_attached_input_sections_ : 1;
|
|
// True if the input sections attached to this output section have
|
|
// already been sorted.
|
|
bool attached_input_sections_are_sorted_ : 1;
|
|
// True if this section holds relro data.
|
|
bool is_relro_ : 1;
|
|
// True if this is a small section.
|
|
bool is_small_section_ : 1;
|
|
// True if this is a large section.
|
|
bool is_large_section_ : 1;
|
|
// Whether code-fills are generated at write.
|
|
bool generate_code_fills_at_write_ : 1;
|
|
// Whether the entry size field should be zero.
|
|
bool is_entsize_zero_ : 1;
|
|
// Whether section offsets need adjustment due to relaxation.
|
|
bool section_offsets_need_adjustment_ : 1;
|
|
// Whether this is a NOLOAD section.
|
|
bool is_noload_ : 1;
|
|
// Whether this always keeps input section.
|
|
bool always_keeps_input_sections_ : 1;
|
|
// Whether this section has a fixed layout, for incremental update links.
|
|
bool has_fixed_layout_ : 1;
|
|
// True if we can add patch space to this section.
|
|
bool is_patch_space_allowed_ : 1;
|
|
// True if this output section goes into a unique segment.
|
|
bool is_unique_segment_ : 1;
|
|
// For SHT_TLS sections, the offset of this section relative to the base
|
|
// of the TLS segment.
|
|
uint64_t tls_offset_;
|
|
// Additional segment flags, specified via linker plugin, when mapping some
|
|
// input sections to unique segments.
|
|
uint64_t extra_segment_flags_;
|
|
// Segment alignment specified via linker plugin, when mapping some
|
|
// input sections to unique segments.
|
|
uint64_t segment_alignment_;
|
|
// Saved checkpoint.
|
|
Checkpoint_output_section* checkpoint_;
|
|
// Fast lookup maps for merged and relaxed input sections.
|
|
Output_section_lookup_maps* lookup_maps_;
|
|
// List of available regions within the section, for incremental
|
|
// update links.
|
|
Free_list free_list_;
|
|
// Method for filling chunks of free space.
|
|
Output_fill* free_space_fill_;
|
|
// Amount added as patch space for incremental linking.
|
|
off_t patch_space_;
|
|
};
|
|
|
|
// An output segment. PT_LOAD segments are built from collections of
|
|
// output sections. Other segments typically point within PT_LOAD
|
|
// segments, and are built directly as needed.
|
|
//
|
|
// NOTE: We want to use the copy constructor for this class. During
|
|
// relaxation, we may try built the segments multiple times. We do
|
|
// that by copying the original segment list before lay-out, doing
|
|
// a trial lay-out and roll-back to the saved copied if we need to
|
|
// to the lay-out again.
|
|
|
|
class Output_segment
|
|
{
|
|
public:
|
|
// Create an output segment, specifying the type and flags.
|
|
Output_segment(elfcpp::Elf_Word, elfcpp::Elf_Word);
|
|
|
|
// Return the virtual address.
|
|
uint64_t
|
|
vaddr() const
|
|
{ return this->vaddr_; }
|
|
|
|
// Return the physical address.
|
|
uint64_t
|
|
paddr() const
|
|
{ return this->paddr_; }
|
|
|
|
// Return the segment type.
|
|
elfcpp::Elf_Word
|
|
type() const
|
|
{ return this->type_; }
|
|
|
|
// Return the segment flags.
|
|
elfcpp::Elf_Word
|
|
flags() const
|
|
{ return this->flags_; }
|
|
|
|
// Return the memory size.
|
|
uint64_t
|
|
memsz() const
|
|
{ return this->memsz_; }
|
|
|
|
// Return the file size.
|
|
off_t
|
|
filesz() const
|
|
{ return this->filesz_; }
|
|
|
|
// Return the file offset.
|
|
off_t
|
|
offset() const
|
|
{ return this->offset_; }
|
|
|
|
// Whether this is a segment created to hold large data sections.
|
|
bool
|
|
is_large_data_segment() const
|
|
{ return this->is_large_data_segment_; }
|
|
|
|
// Record that this is a segment created to hold large data
|
|
// sections.
|
|
void
|
|
set_is_large_data_segment()
|
|
{ this->is_large_data_segment_ = true; }
|
|
|
|
bool
|
|
is_unique_segment() const
|
|
{ return this->is_unique_segment_; }
|
|
|
|
// Mark segment as unique, happens when linker plugins request that
|
|
// certain input sections be mapped to unique segments.
|
|
void
|
|
set_is_unique_segment()
|
|
{ this->is_unique_segment_ = true; }
|
|
|
|
// Return the maximum alignment of the Output_data.
|
|
uint64_t
|
|
maximum_alignment();
|
|
|
|
// Add the Output_section OS to this PT_LOAD segment. SEG_FLAGS is
|
|
// the segment flags to use.
|
|
void
|
|
add_output_section_to_load(Layout* layout, Output_section* os,
|
|
elfcpp::Elf_Word seg_flags);
|
|
|
|
// Add the Output_section OS to this non-PT_LOAD segment. SEG_FLAGS
|
|
// is the segment flags to use.
|
|
void
|
|
add_output_section_to_nonload(Output_section* os,
|
|
elfcpp::Elf_Word seg_flags);
|
|
|
|
// Remove an Output_section from this segment. It is an error if it
|
|
// is not present.
|
|
void
|
|
remove_output_section(Output_section* os);
|
|
|
|
// Add an Output_data (which need not be an Output_section) to the
|
|
// start of this segment.
|
|
void
|
|
add_initial_output_data(Output_data*);
|
|
|
|
// Return true if this segment has any sections which hold actual
|
|
// data, rather than being a BSS section.
|
|
bool
|
|
has_any_data_sections() const;
|
|
|
|
// Whether this segment has a dynamic relocs.
|
|
bool
|
|
has_dynamic_reloc() const;
|
|
|
|
// Return the first section.
|
|
Output_section*
|
|
first_section() const;
|
|
|
|
// Return the address of the first section.
|
|
uint64_t
|
|
first_section_load_address() const
|
|
{
|
|
const Output_section* os = this->first_section();
|
|
return os->has_load_address() ? os->load_address() : os->address();
|
|
}
|
|
|
|
// Return whether the addresses have been set already.
|
|
bool
|
|
are_addresses_set() const
|
|
{ return this->are_addresses_set_; }
|
|
|
|
// Set the addresses.
|
|
void
|
|
set_addresses(uint64_t vaddr, uint64_t paddr)
|
|
{
|
|
this->vaddr_ = vaddr;
|
|
this->paddr_ = paddr;
|
|
this->are_addresses_set_ = true;
|
|
}
|
|
|
|
// Update the flags for the flags of an output section added to this
|
|
// segment.
|
|
void
|
|
update_flags_for_output_section(elfcpp::Elf_Xword flags)
|
|
{
|
|
// The ELF ABI specifies that a PT_TLS segment should always have
|
|
// PF_R as the flags.
|
|
if (this->type() != elfcpp::PT_TLS)
|
|
this->flags_ |= flags;
|
|
}
|
|
|
|
// Set the segment flags. This is only used if we have a PHDRS
|
|
// clause which explicitly specifies the flags.
|
|
void
|
|
set_flags(elfcpp::Elf_Word flags)
|
|
{ this->flags_ = flags; }
|
|
|
|
// Set the address of the segment to ADDR and the offset to *POFF
|
|
// and set the addresses and offsets of all contained output
|
|
// sections accordingly. Set the section indexes of all contained
|
|
// output sections starting with *PSHNDX. If RESET is true, first
|
|
// reset the addresses of the contained sections. Return the
|
|
// address of the immediately following segment. Update *POFF and
|
|
// *PSHNDX. This should only be called for a PT_LOAD segment.
|
|
uint64_t
|
|
set_section_addresses(const Target*, Layout*, bool reset, uint64_t addr,
|
|
unsigned int* increase_relro, bool* has_relro,
|
|
off_t* poff, unsigned int* pshndx);
|
|
|
|
// Set the minimum alignment of this segment. This may be adjusted
|
|
// upward based on the section alignments.
|
|
void
|
|
set_minimum_p_align(uint64_t align)
|
|
{
|
|
if (align > this->min_p_align_)
|
|
this->min_p_align_ = align;
|
|
}
|
|
|
|
// Set the offset of this segment based on the section. This should
|
|
// only be called for a non-PT_LOAD segment.
|
|
void
|
|
set_offset(unsigned int increase);
|
|
|
|
// Set the TLS offsets of the sections contained in the PT_TLS segment.
|
|
void
|
|
set_tls_offsets();
|
|
|
|
// Return the number of output sections.
|
|
unsigned int
|
|
output_section_count() const;
|
|
|
|
// Return the section attached to the list segment with the lowest
|
|
// load address. This is used when handling a PHDRS clause in a
|
|
// linker script.
|
|
Output_section*
|
|
section_with_lowest_load_address() const;
|
|
|
|
// Write the segment header into *OPHDR.
|
|
template<int size, bool big_endian>
|
|
void
|
|
write_header(elfcpp::Phdr_write<size, big_endian>*);
|
|
|
|
// Write the section headers of associated sections into V.
|
|
template<int size, bool big_endian>
|
|
unsigned char*
|
|
write_section_headers(const Layout*, const Stringpool*, unsigned char* v,
|
|
unsigned int* pshndx) const;
|
|
|
|
// Print the output sections in the map file.
|
|
void
|
|
print_sections_to_mapfile(Mapfile*) const;
|
|
|
|
private:
|
|
typedef std::vector<Output_data*> Output_data_list;
|
|
|
|
// Find the maximum alignment in an Output_data_list.
|
|
static uint64_t
|
|
maximum_alignment_list(const Output_data_list*);
|
|
|
|
// Return whether the first data section is a relro section.
|
|
bool
|
|
is_first_section_relro() const;
|
|
|
|
// Set the section addresses in an Output_data_list.
|
|
uint64_t
|
|
set_section_list_addresses(Layout*, bool reset, Output_data_list*,
|
|
uint64_t addr, off_t* poff, unsigned int* pshndx,
|
|
bool* in_tls);
|
|
|
|
// Return the number of Output_sections in an Output_data_list.
|
|
unsigned int
|
|
output_section_count_list(const Output_data_list*) const;
|
|
|
|
// Return whether an Output_data_list has a dynamic reloc.
|
|
bool
|
|
has_dynamic_reloc_list(const Output_data_list*) const;
|
|
|
|
// Find the section with the lowest load address in an
|
|
// Output_data_list.
|
|
void
|
|
lowest_load_address_in_list(const Output_data_list* pdl,
|
|
Output_section** found,
|
|
uint64_t* found_lma) const;
|
|
|
|
// Find the first and last entries by address.
|
|
void
|
|
find_first_and_last_list(const Output_data_list* pdl,
|
|
const Output_data** pfirst,
|
|
const Output_data** plast) const;
|
|
|
|
// Write the section headers in the list into V.
|
|
template<int size, bool big_endian>
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unsigned char*
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write_section_headers_list(const Layout*, const Stringpool*,
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const Output_data_list*, unsigned char* v,
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unsigned int* pshdx) const;
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// Print a section list to the mapfile.
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void
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print_section_list_to_mapfile(Mapfile*, const Output_data_list*) const;
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// NOTE: We want to use the copy constructor. Currently, shallow copy
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// works for us so we do not need to write our own copy constructor.
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// The list of output data attached to this segment.
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Output_data_list output_lists_[ORDER_MAX];
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// The segment virtual address.
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uint64_t vaddr_;
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// The segment physical address.
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uint64_t paddr_;
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// The size of the segment in memory.
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uint64_t memsz_;
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// The maximum section alignment. The is_max_align_known_ field
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// indicates whether this has been finalized.
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uint64_t max_align_;
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// The required minimum value for the p_align field. This is used
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// for PT_LOAD segments. Note that this does not mean that
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// addresses should be aligned to this value; it means the p_paddr
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// and p_vaddr fields must be congruent modulo this value. For
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// non-PT_LOAD segments, the dynamic linker works more efficiently
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// if the p_align field has the more conventional value, although it
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// can align as needed.
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uint64_t min_p_align_;
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// The offset of the segment data within the file.
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off_t offset_;
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// The size of the segment data in the file.
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off_t filesz_;
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// The segment type;
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elfcpp::Elf_Word type_;
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// The segment flags.
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elfcpp::Elf_Word flags_;
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// Whether we have finalized max_align_.
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bool is_max_align_known_ : 1;
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// Whether vaddr and paddr were set by a linker script.
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bool are_addresses_set_ : 1;
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// Whether this segment holds large data sections.
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bool is_large_data_segment_ : 1;
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// Whether this was marked as a unique segment via a linker plugin.
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bool is_unique_segment_ : 1;
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};
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// This class represents the output file.
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class Output_file
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{
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public:
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Output_file(const char* name);
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// Indicate that this is a temporary file which should not be
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// output.
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void
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set_is_temporary()
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{ this->is_temporary_ = true; }
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// Try to open an existing file. Returns false if the file doesn't
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// exist, has a size of 0 or can't be mmaped. This method is
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// thread-unsafe. If BASE_NAME is not NULL, use the contents of
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// that file as the base for incremental linking.
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bool
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open_base_file(const char* base_name, bool writable);
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// Open the output file. FILE_SIZE is the final size of the file.
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// If the file already exists, it is deleted/truncated. This method
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// is thread-unsafe.
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void
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open(off_t file_size);
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// Resize the output file. This method is thread-unsafe.
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void
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resize(off_t file_size);
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// Close the output file (flushing all buffered data) and make sure
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// there are no errors. This method is thread-unsafe.
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void
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close();
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// Return the size of this file.
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off_t
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filesize()
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{ return this->file_size_; }
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// Return the name of this file.
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const char*
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filename()
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{ return this->name_; }
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// We currently always use mmap which makes the view handling quite
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// simple. In the future we may support other approaches.
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// Write data to the output file.
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void
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write(off_t offset, const void* data, size_t len)
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{ memcpy(this->base_ + offset, data, len); }
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// Get a buffer to use to write to the file, given the offset into
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// the file and the size.
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unsigned char*
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get_output_view(off_t start, size_t size)
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{
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gold_assert(start >= 0
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&& start + static_cast<off_t>(size) <= this->file_size_);
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return this->base_ + start;
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}
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// VIEW must have been returned by get_output_view. Write the
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// buffer to the file, passing in the offset and the size.
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void
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write_output_view(off_t, size_t, unsigned char*)
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{ }
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// Get a read/write buffer. This is used when we want to write part
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// of the file, read it in, and write it again.
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unsigned char*
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get_input_output_view(off_t start, size_t size)
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{ return this->get_output_view(start, size); }
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// Write a read/write buffer back to the file.
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void
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write_input_output_view(off_t, size_t, unsigned char*)
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{ }
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// Get a read buffer. This is used when we just want to read part
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// of the file back it in.
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const unsigned char*
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get_input_view(off_t start, size_t size)
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{ return this->get_output_view(start, size); }
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// Release a read bfufer.
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void
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free_input_view(off_t, size_t, const unsigned char*)
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{ }
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private:
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// Map the file into memory or, if that fails, allocate anonymous
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// memory.
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void
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map();
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// Allocate anonymous memory for the file.
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bool
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map_anonymous();
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// Map the file into memory.
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bool
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map_no_anonymous(bool);
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// Unmap the file from memory (and flush to disk buffers).
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void
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unmap();
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// File name.
|
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const char* name_;
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// File descriptor.
|
|
int o_;
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// File size.
|
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off_t file_size_;
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// Base of file mapped into memory.
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unsigned char* base_;
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// True iff base_ points to a memory buffer rather than an output file.
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bool map_is_anonymous_;
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// True if base_ was allocated using new rather than mmap.
|
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bool map_is_allocated_;
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// True if this is a temporary file which should not be output.
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bool is_temporary_;
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};
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} // End namespace gold.
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#endif // !defined(GOLD_OUTPUT_H)
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