707 lines
20 KiB
C++
707 lines
20 KiB
C++
// layout.h -- lay out output file sections for gold -*- C++ -*-
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// Copyright 2006, 2007, 2008 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_LAYOUT_H
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#define GOLD_LAYOUT_H
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#include <list>
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#include <string>
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#include <utility>
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#include <vector>
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#include "script.h"
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#include "workqueue.h"
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#include "object.h"
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#include "dynobj.h"
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#include "stringpool.h"
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namespace gold
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{
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class General_options;
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class Input_objects;
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class Symbol_table;
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class Output_section_data;
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class Output_section;
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class Output_section_headers;
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class Output_segment;
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class Output_data;
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class Output_data_dynamic;
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class Eh_frame;
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class Target;
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// This task function handles mapping the input sections to output
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// sections and laying them out in memory.
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class Layout_task_runner : public Task_function_runner
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{
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public:
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// OPTIONS is the command line options, INPUT_OBJECTS is the list of
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// input objects, SYMTAB is the symbol table, LAYOUT is the layout
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// object.
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Layout_task_runner(const General_options& options,
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const Input_objects* input_objects,
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Symbol_table* symtab,
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Layout* layout)
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: options_(options), input_objects_(input_objects), symtab_(symtab),
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layout_(layout)
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{ }
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// Run the operation.
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void
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run(Workqueue*, const Task*);
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private:
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Layout_task_runner(const Layout_task_runner&);
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Layout_task_runner& operator=(const Layout_task_runner&);
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const General_options& options_;
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const Input_objects* input_objects_;
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Symbol_table* symtab_;
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Layout* layout_;
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};
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// This class handles the details of laying out input sections.
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class Layout
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{
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public:
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Layout(const General_options& options, Script_options*);
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// Given an input section SHNDX, named NAME, with data in SHDR, from
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// the object file OBJECT, return the output section where this
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// input section should go. RELOC_SHNDX is the index of a
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// relocation section which applies to this section, or 0 if none,
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// or -1U if more than one. RELOC_TYPE is the type of the
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// relocation section if there is one. Set *OFFSET to the offset
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// within the output section.
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template<int size, bool big_endian>
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Output_section*
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layout(Sized_relobj<size, big_endian> *object, unsigned int shndx,
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const char* name, const elfcpp::Shdr<size, big_endian>& shdr,
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unsigned int reloc_shndx, unsigned int reloc_type, off_t* offset);
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// Like layout, only for exception frame sections. OBJECT is an
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// object file. SYMBOLS is the contents of the symbol table
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// section, with size SYMBOLS_SIZE. SYMBOL_NAMES is the contents of
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// the symbol name section, with size SYMBOL_NAMES_SIZE. SHNDX is a
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// .eh_frame section in OBJECT. SHDR is the section header.
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// RELOC_SHNDX is the index of a relocation section which applies to
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// this section, or 0 if none, or -1U if more than one. RELOC_TYPE
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// is the type of the relocation section if there is one. This
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// returns the output section, and sets *OFFSET to the offset.
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template<int size, bool big_endian>
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Output_section*
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layout_eh_frame(Sized_relobj<size, big_endian>* object,
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const unsigned char* symbols,
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off_t symbols_size,
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const unsigned char* symbol_names,
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off_t symbol_names_size,
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unsigned int shndx,
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const elfcpp::Shdr<size, big_endian>& shdr,
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unsigned int reloc_shndx, unsigned int reloc_type,
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off_t* offset);
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// Handle a GNU stack note. This is called once per input object
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// file. SEEN_GNU_STACK is true if the object file has a
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// .note.GNU-stack section. GNU_STACK_FLAGS is the section flags
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// from that section if there was one.
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void
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layout_gnu_stack(bool seen_gnu_stack, uint64_t gnu_stack_flags);
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// Add an Output_section_data to the layout. This is used for
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// special sections like the GOT section.
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void
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add_output_section_data(const char* name, elfcpp::Elf_Word type,
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elfcpp::Elf_Xword flags,
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Output_section_data*);
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// Create dynamic sections if necessary.
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void
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create_initial_dynamic_sections(Symbol_table*);
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// Define __start and __stop symbols for output sections.
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void
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define_section_symbols(Symbol_table*);
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// Define symbols from any linker script.
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void
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define_script_symbols(Symbol_table* symtab)
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{ this->script_options_->add_symbols_to_table(symtab); }
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// Return the Stringpool used for symbol names.
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const Stringpool*
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sympool() const
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{ return &this->sympool_; }
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// Return the Stringpool used for dynamic symbol names and dynamic
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// tags.
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const Stringpool*
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dynpool() const
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{ return &this->dynpool_; }
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// Return whether a section is a .gnu.linkonce section, given the
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// section name.
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static inline bool
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is_linkonce(const char* name)
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{ return strncmp(name, ".gnu.linkonce", sizeof(".gnu.linkonce") - 1) == 0; }
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// Record the signature of a comdat section, and return whether to
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// include it in the link. The GROUP parameter is true for a
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// section group signature, false for a signature derived from a
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// .gnu.linkonce section.
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bool
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add_comdat(const char*, bool group);
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// Finalize the layout after all the input sections have been added.
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off_t
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finalize(const Input_objects*, Symbol_table*, const Task*);
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// Return whether any sections require postprocessing.
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bool
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any_postprocessing_sections() const
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{ return this->any_postprocessing_sections_; }
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// Return the size of the output file.
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off_t
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output_file_size() const
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{ return this->output_file_size_; }
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// Return the TLS segment. This will return NULL if there isn't
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// one.
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Output_segment*
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tls_segment() const
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{ return this->tls_segment_; }
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// Return the normal symbol table.
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Output_section*
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symtab_section() const
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{
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gold_assert(this->symtab_section_ != NULL);
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return this->symtab_section_;
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}
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// Return the dynamic symbol table.
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Output_section*
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dynsym_section() const
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{
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gold_assert(this->dynsym_section_ != NULL);
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return this->dynsym_section_;
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}
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// Return the dynamic tags.
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Output_data_dynamic*
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dynamic_data() const
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{ return this->dynamic_data_; }
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// Write out the output sections.
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void
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write_output_sections(Output_file* of) const;
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// Write out data not associated with an input file or the symbol
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// table.
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void
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write_data(const Symbol_table*, Output_file*) const;
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// Write out output sections which can not be written until all the
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// input sections are complete.
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void
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write_sections_after_input_sections(Output_file* of);
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// Return an output section named NAME, or NULL if there is none.
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Output_section*
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find_output_section(const char* name) const;
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// Return an output segment of type TYPE, with segment flags SET set
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// and segment flags CLEAR clear. Return NULL if there is none.
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Output_segment*
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find_output_segment(elfcpp::PT type, elfcpp::Elf_Word set,
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elfcpp::Elf_Word clear) const;
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// Return the number of segments we expect to produce.
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size_t
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expected_segment_count() const;
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// Set a flag to indicate that an object file uses the static TLS model.
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void
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set_has_static_tls()
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{ this->has_static_tls_ = true; }
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// Return true if any object file uses the static TLS model.
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bool
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has_static_tls() const
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{ return this->has_static_tls_; }
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// Return the options which may be set by a linker script.
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Script_options*
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script_options()
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{ return this->script_options_; }
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const Script_options*
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script_options() const
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{ return this->script_options_; }
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// Dump statistical information to stderr.
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void
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print_stats() const;
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// A list of segments.
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typedef std::vector<Output_segment*> Segment_list;
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// A list of sections.
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typedef std::vector<Output_section*> Section_list;
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// The list of information to write out which is not attached to
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// either a section or a segment.
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typedef std::vector<Output_data*> Data_list;
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// Store the allocated sections into the section list. This is used
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// by the linker script code.
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void
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get_allocated_sections(Section_list*) const;
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// Make a segment. This is used by the linker script code.
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Output_segment*
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make_output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags);
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// Return the number of segments.
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size_t
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segment_count() const
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{ return this->segment_list_.size(); }
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// Map from section flags to segment flags.
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static elfcpp::Elf_Word
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section_flags_to_segment(elfcpp::Elf_Xword flags);
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private:
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Layout(const Layout&);
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Layout& operator=(const Layout&);
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// Mapping from .gnu.linkonce section names to output section names.
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struct Linkonce_mapping
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{
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const char* from;
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int fromlen;
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const char* to;
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int tolen;
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};
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static const Linkonce_mapping linkonce_mapping[];
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static const int linkonce_mapping_count;
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// Create a .note section for gold.
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void
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create_gold_note();
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// Record whether the stack must be executable.
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void
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create_executable_stack_info(const Target*);
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// Find the first read-only PT_LOAD segment, creating one if
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// necessary.
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Output_segment*
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find_first_load_seg();
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// Count the local symbols in the regular symbol table and the dynamic
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// symbol table, and build the respective string pools.
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void
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count_local_symbols(const Task*, const Input_objects*);
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// Create the output sections for the symbol table.
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void
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create_symtab_sections(const Input_objects*, Symbol_table*, off_t*);
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// Create the .shstrtab section.
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Output_section*
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create_shstrtab();
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// Create the section header table.
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void
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create_shdrs(off_t*);
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// Create the dynamic symbol table.
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void
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create_dynamic_symtab(const Input_objects*, Symbol_table*,
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Output_section** pdynstr,
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unsigned int* plocal_dynamic_count,
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std::vector<Symbol*>* pdynamic_symbols,
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Versions* versions);
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// Assign offsets to each local portion of the dynamic symbol table.
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void
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assign_local_dynsym_offsets(const Input_objects*);
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// Finish the .dynamic section and PT_DYNAMIC segment.
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void
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finish_dynamic_section(const Input_objects*, const Symbol_table*);
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// Create the .interp section and PT_INTERP segment.
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void
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create_interp(const Target* target);
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// Create the version sections.
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void
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create_version_sections(const Versions*,
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const Symbol_table*,
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unsigned int local_symcount,
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const std::vector<Symbol*>& dynamic_symbols,
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const Output_section* dynstr);
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template<int size, bool big_endian>
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void
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sized_create_version_sections(const Versions* versions,
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const Symbol_table*,
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unsigned int local_symcount,
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const std::vector<Symbol*>& dynamic_symbols,
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const Output_section* dynstr
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ACCEPT_SIZE_ENDIAN);
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// Return whether to include this section in the link.
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template<int size, bool big_endian>
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bool
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include_section(Sized_relobj<size, big_endian>* object, const char* name,
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const elfcpp::Shdr<size, big_endian>&);
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// Return the output section name to use given an input section
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// name. Set *PLEN to the length of the name. *PLEN must be
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// initialized to the length of NAME.
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static const char*
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output_section_name(const char* name, size_t* plen);
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// Return the output section name to use for a linkonce section
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// name. PLEN is as for output_section_name.
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static const char*
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linkonce_output_name(const char* name, size_t* plen);
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// Return the output section for NAME, TYPE and FLAGS.
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Output_section*
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get_output_section(const char* name, Stringpool::Key name_key,
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elfcpp::Elf_Word type, elfcpp::Elf_Xword flags);
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// Choose the output section for NAME in RELOBJ.
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Output_section*
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choose_output_section(const Relobj* relobj, const char* name,
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elfcpp::Elf_Word type, elfcpp::Elf_Xword flags,
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bool adjust_name);
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// Create a new Output_section.
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Output_section*
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make_output_section(const char* name, elfcpp::Elf_Word type,
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elfcpp::Elf_Xword flags);
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// Set the final file offsets of all the segments.
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off_t
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set_segment_offsets(const Target*, Output_segment*, unsigned int* pshndx);
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// Set the final file offsets of all the sections not associated
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// with a segment. We set section offsets in three passes: the
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// first handles all allocated sections, the second sections that
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// require postprocessing, and the last the late-bound STRTAB
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// sections (probably only shstrtab, which is the one we care about
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// because it holds section names).
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enum Section_offset_pass
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{
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BEFORE_INPUT_SECTIONS_PASS,
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POSTPROCESSING_SECTIONS_PASS,
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STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS
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};
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off_t
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set_section_offsets(off_t, Section_offset_pass pass);
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// Set the final section indexes of all the sections not associated
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// with a segment. Returns the next unused index.
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unsigned int
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set_section_indexes(unsigned int pshndx);
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// Set the section addresses when using a script.
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Output_segment*
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set_section_addresses_from_script(Symbol_table*);
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// Return whether SEG1 comes before SEG2 in the output file.
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static bool
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segment_precedes(const Output_segment* seg1, const Output_segment* seg2);
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// A mapping used for group signatures.
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typedef Unordered_map<std::string, bool> Signatures;
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// Mapping from input section name/type/flags to output section. We
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// use canonicalized strings here.
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typedef std::pair<Stringpool::Key,
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std::pair<elfcpp::Elf_Word, elfcpp::Elf_Xword> > Key;
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struct Hash_key
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{
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size_t
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operator()(const Key& k) const;
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};
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typedef Unordered_map<Key, Output_section*, Hash_key> Section_name_map;
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// A comparison class for segments.
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struct Compare_segments
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{
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bool
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operator()(const Output_segment* seg1, const Output_segment* seg2)
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{ return Layout::segment_precedes(seg1, seg2); }
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};
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// A reference to the options on the command line.
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const General_options& options_;
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// Information set by scripts or by command line options.
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Script_options* script_options_;
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// The output section names.
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Stringpool namepool_;
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// The output symbol names.
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Stringpool sympool_;
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// The dynamic strings, if needed.
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Stringpool dynpool_;
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// The list of group sections and linkonce sections which we have seen.
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Signatures signatures_;
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// The mapping from input section name/type/flags to output sections.
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Section_name_map section_name_map_;
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// The list of output segments.
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Segment_list segment_list_;
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// The list of output sections.
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Section_list section_list_;
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// The list of output sections which are not attached to any output
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// segment.
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Section_list unattached_section_list_;
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// The list of unattached Output_data objects which require special
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// handling because they are not Output_sections.
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Data_list special_output_list_;
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// The section headers.
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Output_section_headers* section_headers_;
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// A pointer to the PT_TLS segment if there is one.
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Output_segment* tls_segment_;
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// The SHT_SYMTAB output section.
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Output_section* symtab_section_;
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// The SHT_DYNSYM output section if there is one.
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Output_section* dynsym_section_;
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// The SHT_DYNAMIC output section if there is one.
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Output_section* dynamic_section_;
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// The dynamic data which goes into dynamic_section_.
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Output_data_dynamic* dynamic_data_;
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// The exception frame output section if there is one.
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Output_section* eh_frame_section_;
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// The exception frame data for eh_frame_section_.
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Eh_frame* eh_frame_data_;
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// The exception frame header output section if there is one.
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Output_section* eh_frame_hdr_section_;
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// The size of the output file.
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off_t output_file_size_;
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// Whether we have seen an object file marked to require an
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// executable stack.
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bool input_requires_executable_stack_;
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// Whether we have seen at least one object file with an executable
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// stack marker.
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bool input_with_gnu_stack_note_;
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// Whether we have seen at least one object file without an
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// executable stack marker.
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bool input_without_gnu_stack_note_;
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// Whether we have seen an object file that uses the static TLS model.
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bool has_static_tls_;
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// Whether any sections require postprocessing.
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bool any_postprocessing_sections_;
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};
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// This task handles writing out data in output sections which is not
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// part of an input section, or which requires special handling. When
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|
// this is done, it unblocks both output_sections_blocker and
|
|
// final_blocker.
|
|
|
|
class Write_sections_task : public Task
|
|
{
|
|
public:
|
|
Write_sections_task(const Layout* layout, Output_file* of,
|
|
Task_token* output_sections_blocker,
|
|
Task_token* final_blocker)
|
|
: layout_(layout), of_(of),
|
|
output_sections_blocker_(output_sections_blocker),
|
|
final_blocker_(final_blocker)
|
|
{ }
|
|
|
|
// The standard Task methods.
|
|
|
|
Task_token*
|
|
is_runnable();
|
|
|
|
void
|
|
locks(Task_locker*);
|
|
|
|
void
|
|
run(Workqueue*);
|
|
|
|
std::string
|
|
get_name() const
|
|
{ return "Write_sections_task"; }
|
|
|
|
private:
|
|
class Write_sections_locker;
|
|
|
|
const Layout* layout_;
|
|
Output_file* of_;
|
|
Task_token* output_sections_blocker_;
|
|
Task_token* final_blocker_;
|
|
};
|
|
|
|
// This task handles writing out data which is not part of a section
|
|
// or segment.
|
|
|
|
class Write_data_task : public Task
|
|
{
|
|
public:
|
|
Write_data_task(const Layout* layout, const Symbol_table* symtab,
|
|
Output_file* of, Task_token* final_blocker)
|
|
: layout_(layout), symtab_(symtab), of_(of), final_blocker_(final_blocker)
|
|
{ }
|
|
|
|
// The standard Task methods.
|
|
|
|
Task_token*
|
|
is_runnable();
|
|
|
|
void
|
|
locks(Task_locker*);
|
|
|
|
void
|
|
run(Workqueue*);
|
|
|
|
std::string
|
|
get_name() const
|
|
{ return "Write_data_task"; }
|
|
|
|
private:
|
|
const Layout* layout_;
|
|
const Symbol_table* symtab_;
|
|
Output_file* of_;
|
|
Task_token* final_blocker_;
|
|
};
|
|
|
|
// This task handles writing out the global symbols.
|
|
|
|
class Write_symbols_task : public Task
|
|
{
|
|
public:
|
|
Write_symbols_task(const Symbol_table* symtab,
|
|
const Input_objects* input_objects,
|
|
const Stringpool* sympool, const Stringpool* dynpool,
|
|
Output_file* of, Task_token* final_blocker)
|
|
: symtab_(symtab), input_objects_(input_objects), sympool_(sympool),
|
|
dynpool_(dynpool), of_(of), final_blocker_(final_blocker)
|
|
{ }
|
|
|
|
// The standard Task methods.
|
|
|
|
Task_token*
|
|
is_runnable();
|
|
|
|
void
|
|
locks(Task_locker*);
|
|
|
|
void
|
|
run(Workqueue*);
|
|
|
|
std::string
|
|
get_name() const
|
|
{ return "Write_symbols_task"; }
|
|
|
|
private:
|
|
const Symbol_table* symtab_;
|
|
const Input_objects* input_objects_;
|
|
const Stringpool* sympool_;
|
|
const Stringpool* dynpool_;
|
|
Output_file* of_;
|
|
Task_token* final_blocker_;
|
|
};
|
|
|
|
// This task handles writing out data in output sections which can't
|
|
// be written out until all the input sections have been handled.
|
|
// This is for sections whose contents is based on the contents of
|
|
// other output sections.
|
|
|
|
class Write_after_input_sections_task : public Task
|
|
{
|
|
public:
|
|
Write_after_input_sections_task(Layout* layout, Output_file* of,
|
|
Task_token* input_sections_blocker,
|
|
Task_token* final_blocker)
|
|
: layout_(layout), of_(of),
|
|
input_sections_blocker_(input_sections_blocker),
|
|
final_blocker_(final_blocker)
|
|
{ }
|
|
|
|
// The standard Task methods.
|
|
|
|
Task_token*
|
|
is_runnable();
|
|
|
|
void
|
|
locks(Task_locker*);
|
|
|
|
void
|
|
run(Workqueue*);
|
|
|
|
std::string
|
|
get_name() const
|
|
{ return "Write_after_input_sections_task"; }
|
|
|
|
private:
|
|
Layout* layout_;
|
|
Output_file* of_;
|
|
Task_token* input_sections_blocker_;
|
|
Task_token* final_blocker_;
|
|
};
|
|
|
|
// This task function handles closing the file.
|
|
|
|
class Close_task_runner : public Task_function_runner
|
|
{
|
|
public:
|
|
Close_task_runner(Output_file* of)
|
|
: of_(of)
|
|
{ }
|
|
|
|
// Run the operation.
|
|
void
|
|
run(Workqueue*, const Task*);
|
|
|
|
private:
|
|
Output_file* of_;
|
|
};
|
|
|
|
// A small helper function to align an address.
|
|
|
|
inline uint64_t
|
|
align_address(uint64_t address, uint64_t addralign)
|
|
{
|
|
if (addralign != 0)
|
|
address = (address + addralign - 1) &~ (addralign - 1);
|
|
return address;
|
|
}
|
|
|
|
} // End namespace gold.
|
|
|
|
#endif // !defined(GOLD_LAYOUT_H)
|