--- /dev/null
+// output.h -- manage the output file for gold -*- C++ -*-
+
+// Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+// Written by Ian Lance Taylor <iant@google.com>.
+
+// This file is part of gold.
+
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+// MA 02110-1301, USA.
+
+#ifndef GOLD_OUTPUT_H
+#define GOLD_OUTPUT_H
+
+#include <list>
+#include <vector>
+
+#include "elfcpp.h"
+#include "mapfile.h"
+#include "layout.h"
+#include "reloc-types.h"
+
+namespace gold
+{
+
+class General_options;
+class Object;
+class Symbol;
+class Output_file;
+class Output_merge_base;
+class Output_section;
+class Relocatable_relocs;
+class Target;
+template<int size, bool big_endian>
+class Sized_target;
+template<int size, bool big_endian>
+class Sized_relobj;
+
+// This class specifies an input section. It is used as a key type
+// for maps.
+
+class Input_section_specifier
+{
+ public:
+ Input_section_specifier(const Relobj* relobj, unsigned int shndx)
+ : relobj_(relobj), shndx_(shndx)
+ { }
+
+ // Return Relobj of this.
+ const Relobj*
+ relobj() const
+ { return this->relobj_; }
+
+ // Return section index of this.
+ unsigned int
+ shndx() const
+ { return this->shndx_; }
+
+ // Whether this equals to another specifier ISS.
+ bool
+ eq(const Input_section_specifier& iss) const
+ { return this->relobj_ == iss.relobj_ && this->shndx_ == iss.shndx_; }
+
+ // Compute a hash value of this.
+ size_t
+ hash_value() const
+ { return this->string_hash(this->relobj_->name().c_str()) ^ this->shndx_; }
+
+ // Functors for containers.
+ struct equal_to
+ {
+ bool
+ operator()(const Input_section_specifier& iss1,
+ const Input_section_specifier& iss2) const
+ { return iss1.eq(iss2); }
+ };
+
+ struct hash
+ {
+ size_t
+ operator()(const Input_section_specifier& iss) const
+ { return iss.hash_value(); }
+ };
+
+ private:
+ // For portability, we use our own string hash function instead of assuming
+ // __gnu_cxx::hash or std::tr1::hash is available. This is the same hash
+ // function used in Stringpool_template::string_hash.
+ static size_t
+ string_hash(const char* s)
+ {
+ size_t h = 5381;
+ while (*s != '\0')
+ h = h * 33 + *s++;
+ return h;
+ }
+
+ // An object.
+ const Relobj* relobj_;
+ // A section index.
+ unsigned int shndx_;
+};
+
+// An abtract class for data which has to go into the output file.
+
+class Output_data
+{
+ public:
+ explicit Output_data()
+ : address_(0), data_size_(0), offset_(-1),
+ is_address_valid_(false), is_data_size_valid_(false),
+ is_offset_valid_(false), is_data_size_fixed_(false),
+ dynamic_reloc_count_(0)
+ { }
+
+ virtual
+ ~Output_data();
+
+ // Return the address. For allocated sections, this is only valid
+ // after Layout::finalize is finished.
+ uint64_t
+ address() const
+ {
+ gold_assert(this->is_address_valid_);
+ return this->address_;
+ }
+
+ // Return the size of the data. For allocated sections, this must
+ // be valid after Layout::finalize calls set_address, but need not
+ // be valid before then.
+ off_t
+ data_size() const
+ {
+ gold_assert(this->is_data_size_valid_);
+ return this->data_size_;
+ }
+
+ // Return true if data size is fixed.
+ bool
+ is_data_size_fixed() const
+ { return this->is_data_size_fixed_; }
+
+ // Return the file offset. This is only valid after
+ // Layout::finalize is finished. For some non-allocated sections,
+ // it may not be valid until near the end of the link.
+ off_t
+ offset() const
+ {
+ gold_assert(this->is_offset_valid_);
+ return this->offset_;
+ }
+
+ // Reset the address and file offset. This essentially disables the
+ // sanity testing about duplicate and unknown settings.
+ void
+ reset_address_and_file_offset()
+ {
+ this->is_address_valid_ = false;
+ this->is_offset_valid_ = false;
+ if (!this->is_data_size_fixed_)
+ this->is_data_size_valid_ = false;
+ this->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
+ address_and_file_offset_have_reset_values() const
+ { return this->do_address_and_file_offset_have_reset_values(); }
+
+ // Return the required alignment.
+ uint64_t
+ addralign() const
+ { return this->do_addralign(); }
+
+ // Return whether this has a load address.
+ bool
+ has_load_address() const
+ { return this->do_has_load_address(); }
+
+ // Return the load address.
+ uint64_t
+ load_address() const
+ { return this->do_load_address(); }
+
+ // Return whether this is an Output_section.
+ bool
+ is_section() const
+ { return this->do_is_section(); }
+
+ // Return whether this is an Output_section of the specified type.
+ bool
+ is_section_type(elfcpp::Elf_Word stt) const
+ { return this->do_is_section_type(stt); }
+
+ // Return whether this is an Output_section with the specified flag
+ // set.
+ bool
+ is_section_flag_set(elfcpp::Elf_Xword shf) const
+ { return this->do_is_section_flag_set(shf); }
+
+ // Return the output section that this goes in, if there is one.
+ Output_section*
+ output_section()
+ { return this->do_output_section(); }
+
+ // Return the output section index, if there is an output section.
+ unsigned int
+ out_shndx() const
+ { return this->do_out_shndx(); }
+
+ // Set the output section index, if this is an output section.
+ void
+ set_out_shndx(unsigned int shndx)
+ { this->do_set_out_shndx(shndx); }
+
+ // Set the address and file offset of this data, and finalize the
+ // size of the data. This is called during Layout::finalize for
+ // allocated sections.
+ void
+ set_address_and_file_offset(uint64_t addr, off_t off)
+ {
+ this->set_address(addr);
+ this->set_file_offset(off);
+ this->finalize_data_size();
+ }
+
+ // Set the address.
+ void
+ set_address(uint64_t addr)
+ {
+ gold_assert(!this->is_address_valid_);
+ this->address_ = addr;
+ this->is_address_valid_ = true;
+ }
+
+ // Set the file offset.
+ void
+ set_file_offset(off_t off)
+ {
+ gold_assert(!this->is_offset_valid_);
+ this->offset_ = off;
+ this->is_offset_valid_ = true;
+ }
+
+ // Finalize the data size.
+ void
+ finalize_data_size()
+ {
+ if (!this->is_data_size_valid_)
+ {
+ // Tell the child class to set the data size.
+ this->set_final_data_size();
+ gold_assert(this->is_data_size_valid_);
+ }
+ }
+
+ // Set the TLS offset. Called only for SHT_TLS sections.
+ void
+ set_tls_offset(uint64_t tls_base)
+ { this->do_set_tls_offset(tls_base); }
+
+ // Return the TLS offset, relative to the base of the TLS segment.
+ // Valid only for SHT_TLS sections.
+ uint64_t
+ tls_offset() const
+ { return this->do_tls_offset(); }
+
+ // Write the data to the output file. This is called after
+ // Layout::finalize is complete.
+ void
+ write(Output_file* file)
+ { this->do_write(file); }
+
+ // This is called by Layout::finalize to note that the sizes of
+ // allocated sections must now be fixed.
+ static void
+ layout_complete()
+ { Output_data::allocated_sizes_are_fixed = true; }
+
+ // Used to check that layout has been done.
+ static bool
+ is_layout_complete()
+ { return Output_data::allocated_sizes_are_fixed; }
+
+ // Count the number of dynamic relocations applied to this section.
+ void
+ add_dynamic_reloc()
+ { ++this->dynamic_reloc_count_; }
+
+ // Return the number of dynamic relocations applied to this section.
+ unsigned int
+ dynamic_reloc_count() const
+ { return this->dynamic_reloc_count_; }
+
+ // Whether the address is valid.
+ bool
+ is_address_valid() const
+ { return this->is_address_valid_; }
+
+ // Whether the file offset is valid.
+ bool
+ is_offset_valid() const
+ { return this->is_offset_valid_; }
+
+ // Whether the data size is valid.
+ bool
+ is_data_size_valid() const
+ { return this->is_data_size_valid_; }
+
+ // Print information to the map file.
+ void
+ print_to_mapfile(Mapfile* mapfile) const
+ { return this->do_print_to_mapfile(mapfile); }
+
+ protected:
+ // Functions that child classes may or in some cases must implement.
+
+ // Write the data to the output file.
+ virtual void
+ do_write(Output_file*) = 0;
+
+ // Return the required alignment.
+ virtual uint64_t
+ do_addralign() const = 0;
+
+ // Return whether this has a load address.
+ virtual bool
+ do_has_load_address() const
+ { return false; }
+
+ // Return the load address.
+ virtual uint64_t
+ do_load_address() const
+ { gold_unreachable(); }
+
+ // Return whether this is an Output_section.
+ virtual bool
+ do_is_section() const
+ { return false; }
+
+ // Return whether this is an Output_section of the specified type.
+ // This only needs to be implement by Output_section.
+ virtual bool
+ do_is_section_type(elfcpp::Elf_Word) const
+ { return false; }
+
+ // Return whether this is an Output_section with the specific flag
+ // set. This only needs to be implemented by Output_section.
+ virtual bool
+ do_is_section_flag_set(elfcpp::Elf_Xword) const
+ { return false; }
+
+ // Return the output section, if there is one.
+ virtual Output_section*
+ do_output_section()
+ { return NULL; }
+
+ // Return the output section index, if there is an output section.
+ virtual unsigned int
+ do_out_shndx() const
+ { gold_unreachable(); }
+
+ // Set the output section index, if this is an output section.
+ virtual void
+ do_set_out_shndx(unsigned int)
+ { gold_unreachable(); }
+
+ // This is a hook for derived classes to set the data size. This is
+ // called by finalize_data_size, normally called during
+ // Layout::finalize, when the section address is set.
+ virtual void
+ set_final_data_size()
+ { gold_unreachable(); }
+
+ // A hook for resetting the address and file offset.
+ virtual 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.
+ // A child class overriding do_reset_address_and_file_offset may need to
+ // also override this.
+ virtual bool
+ do_address_and_file_offset_have_reset_values() const
+ { return !this->is_address_valid_ && !this->is_offset_valid_; }
+
+ // Set the TLS offset. Called only for SHT_TLS sections.
+ virtual void
+ do_set_tls_offset(uint64_t)
+ { gold_unreachable(); }
+
+ // Return the TLS offset, relative to the base of the TLS segment.
+ // Valid only for SHT_TLS sections.
+ virtual uint64_t
+ do_tls_offset() const
+ { gold_unreachable(); }
+
+ // Print to the map file. This only needs to be implemented by
+ // classes which may appear in a PT_LOAD segment.
+ virtual void
+ do_print_to_mapfile(Mapfile*) const
+ { gold_unreachable(); }
+
+ // Functions that child classes may call.
+
+ // Reset the address. The Output_section class needs this when an
+ // SHF_ALLOC input section is added to an output section which was
+ // formerly not SHF_ALLOC.
+ void
+ mark_address_invalid()
+ { this->is_address_valid_ = false; }
+
+ // Set the size of the data.
+ void
+ set_data_size(off_t data_size)
+ {
+ gold_assert(!this->is_data_size_valid_
+ && !this->is_data_size_fixed_);
+ this->data_size_ = data_size;
+ this->is_data_size_valid_ = true;
+ }
+
+ // Fix the data size. Once it is fixed, it cannot be changed
+ // and the data size remains always valid.
+ void
+ fix_data_size()
+ {
+ gold_assert(this->is_data_size_valid_);
+ this->is_data_size_fixed_ = true;
+ }
+
+ // Get the current data size--this is for the convenience of
+ // sections which build up their size over time.
+ off_t
+ current_data_size_for_child() const
+ { return this->data_size_; }
+
+ // Set the current data size--this is for the convenience of
+ // sections which build up their size over time.
+ void
+ set_current_data_size_for_child(off_t data_size)
+ {
+ gold_assert(!this->is_data_size_valid_);
+ this->data_size_ = data_size;
+ }
+
+ // Return default alignment for the target size.
+ static uint64_t
+ default_alignment();
+
+ // Return default alignment for a specified size--32 or 64.
+ static uint64_t
+ default_alignment_for_size(int size);
+
+ private:
+ Output_data(const Output_data&);
+ Output_data& operator=(const Output_data&);
+
+ // This is used for verification, to make sure that we don't try to
+ // change any sizes of allocated sections after we set the section
+ // addresses.
+ static bool allocated_sizes_are_fixed;
+
+ // Memory address in output file.
+ uint64_t address_;
+ // Size of data in output file.
+ off_t data_size_;
+ // File offset of contents in output file.
+ off_t offset_;
+ // Whether address_ is valid.
+ bool is_address_valid_;
+ // Whether data_size_ is valid.
+ bool is_data_size_valid_;
+ // Whether offset_ is valid.
+ bool is_offset_valid_;
+ // Whether data size is fixed.
+ bool is_data_size_fixed_;
+ // Count of dynamic relocations applied to this section.
+ unsigned int dynamic_reloc_count_;
+};
+
+// Output the section headers.
+
+class Output_section_headers : public Output_data
+{
+ public:
+ Output_section_headers(const Layout*,
+ const Layout::Segment_list*,
+ const Layout::Section_list*,
+ const Layout::Section_list*,
+ const Stringpool*,
+ const Output_section*);
+
+ 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, _("** section headers")); }
+
+ // Set final data size.
+ void
+ set_final_data_size()
+ { 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*);
+
+ // Compute data size.
+ off_t
+ do_size() const;
+
+ const Layout* layout_;
+ const Layout::Segment_list* segment_list_;
+ const Layout::Section_list* section_list_;
+ const Layout::Section_list* unattached_section_list_;
+ const Stringpool* secnamepool_;
+ const Output_section* shstrtab_section_;
+};
+
+// Output the segment headers.
+
+class Output_segment_headers : public Output_data
+{
+ public:
+ Output_segment_headers(const Layout::Segment_list& segment_list);
+
+ 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, _("** segment headers")); }
+
+ // Set final data size.
+ void
+ set_final_data_size()
+ { 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*);
+
+ // 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(const Target*,
+ const Symbol_table*,
+ const Output_segment_headers*,
+ const char* entry);
+
+ // 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;
+
+ const Target* target_;
+ const Symbol_table* symtab_;
+ const Output_segment_headers* segment_header_;
+ const Output_section_headers* section_header_;
+ const Output_section* shstrtab_;
+ const char* entry_;
+};
+
+// 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.
+ 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); }
+
+ // Return whether this is the merge section for the input section
+ // SHNDX in OBJECT. This should return true when output_offset
+ // would return true for some values of OFFSET.
+ bool
+ is_merge_section_for(const Relobj* object, unsigned int shndx) const
+ { return this->do_is_merge_section_for(object, shndx); }
+
+ // 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 is_merge_section_for.
+ virtual bool
+ do_is_merge_section_for(const Relobj*, unsigned int) 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_; }
+
+ // 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)
+ { }
+
+ // Get the current data size.
+ off_t
+ current_data_size() const
+ { return this->current_data_size_for_child(); }
+
+ // 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)
+ { }
+
+ // 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 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);
+
+ Output_reloc(Symbol* gsym, unsigned int type,
+ Sized_relobj<size, big_endian>* relobj,
+ unsigned int shndx, Address address, bool is_relative);
+
+ // 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_section_symbol);
+
+ 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_section_symbol);
+
+ // A reloc against the STT_SECTION symbol of an output section.
+
+ Output_reloc(Output_section* os, unsigned int type, Output_data* od,
+ Address address);
+
+ Output_reloc(Output_section* os, unsigned int type,
+ Sized_relobj<size, big_endian>* relobj,
+ unsigned int shndx, Address address);
+
+ // Return TRUE if this is a RELATIVE relocation.
+ bool
+ is_relative() const
+ { return this->is_relative_; }
+
+ // 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->is_section_symbol_);
+ }
+
+ // 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;
+
+ // 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,
+ // Invalid uninitialized entry.
+ INVALID_CODE = -3U
+ };
+
+ 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;
+ } 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 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_ : 30;
+ // True if the relocation is a RELATIVE relocation.
+ bool is_relative_ : 1;
+ // True if the relocation is against a section symbol.
+ bool is_section_symbol_ : 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)
+ : rel_(gsym, type, od, address, is_relative), 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)
+ : rel_(gsym, type, relobj, shndx, address, is_relative), 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_section_symbol)
+ : rel_(relobj, local_sym_index, type, od, address, is_relative,
+ is_section_symbol),
+ 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_section_symbol)
+ : rel_(relobj, local_sym_index, type, shndx, address, is_relative,
+ is_section_symbol),
+ 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)
+ : rel_(os, type, od, address), addend_(addend)
+ { }
+
+ Output_reloc(Output_section* os, unsigned int type,
+ Sized_relobj<size, big_endian>* relobj,
+ unsigned int shndx, Address address, Addend addend)
+ : rel_(os, type, relobj, shndx, address), addend_(addend)
+ { }
+
+ // 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 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_section_data_build
+{
+ 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_section_data_build(Output_data::default_alignment_for_size(size)),
+ sort_relocs_(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);
+ od->add_dynamic_reloc();
+ }
+
+ 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_;
+ // Whether to sort the relocations when writing them out, to make
+ // the dynamic linker more efficient.
+ bool sort_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)); }
+
+ 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)); }
+
+ // These are to simplify the Copy_relocs class.
+
+ void
+ add_global(Symbol* gsym, unsigned int type, Output_data* od, Address address,
+ Address addend)
+ {
+ gold_assert(addend == 0);
+ this->add_global(gsym, type, od, address);
+ }
+
+ void
+ add_global(Symbol* gsym, unsigned int type, Output_data* od,
+ Sized_relobj<size, big_endian>* relobj,
+ unsigned int shndx, Address address, Address addend)
+ {
+ gold_assert(addend == 0);
+ this->add_global(gsym, type, od, relobj, shndx, address);
+ }
+
+ // 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)); }
+
+ 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));
+ }
+
+ // 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));
+ }
+
+ 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));
+ }
+
+ // 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, 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, 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, true));
+ }
+
+ 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, true));
+ }
+
+ // 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)); }
+
+ 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)); }
+};
+
+// 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)); }
+
+ 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)); }
+
+ // 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)
+ { this->add(od, Output_reloc_type(gsym, type, od, address, addend, true)); }
+
+ 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)
+ { this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
+ addend, true)); }
+
+ // 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));
+ }
+
+ 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));
+ }
+
+ // 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)
+ {
+ this->add(od, Output_reloc_type(relobj, local_sym_index, type, od, address,
+ addend, true, 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,
+ Addend addend)
+ {
+ this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
+ address, addend, true, 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, true));
+ }
+
+ 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, true));
+ }
+
+ // 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(os, Output_reloc_type(os, type, od, address, addend)); }
+
+ void
+ add_output_section(Output_section* os, unsigned int type,
+ Sized_relobj<size, big_endian>* relobj,
+ unsigned int shndx, Address address, Addend addend)
+ { this->add(os, Output_reloc_type(os, type, 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_for_relocatable. 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<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<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.
+
+template<int size, bool big_endian>
+class Output_data_got : public Output_section_data_build
+{
+ public:
+ typedef typename elfcpp::Elf_types<size>::Elf_Addr Valtype;
+ typedef Output_data_reloc<elfcpp::SHT_REL, true, size, big_endian> Rel_dyn;
+ typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> Rela_dyn;
+
+ Output_data_got()
+ : Output_section_data_build(Output_data::default_alignment_for_size(size)),
+ entries_()
+ { }
+
+ // 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);
+
+ // 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,
+ Rel_dyn* rel_dyn, unsigned int r_type);
+
+ void
+ add_global_with_rela(Symbol* gsym, unsigned int got_type,
+ Rela_dyn* rela_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,
+ Rel_dyn* rel_dyn, unsigned int r_type_1,
+ unsigned int r_type_2);
+
+ void
+ add_global_pair_with_rela(Symbol* gsym, unsigned int got_type,
+ Rela_dyn* rela_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(Sized_relobj<size, big_endian>* object, unsigned int sym_index,
+ unsigned int 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(Sized_relobj<size, big_endian>* object,
+ unsigned int sym_index, unsigned int got_type,
+ Rel_dyn* rel_dyn, unsigned int r_type);
+
+ void
+ add_local_with_rela(Sized_relobj<size, big_endian>* object,
+ unsigned int sym_index, unsigned int got_type,
+ Rela_dyn* rela_dyn, unsigned int r_type);
+
+ // Add a pair of entries for a local symbol to the GOT, and add
+ // dynamic relocations of type R_TYPE_1 and R_TYPE_2, respectively.
+ void
+ add_local_pair_with_rel(Sized_relobj<size, big_endian>* object,
+ unsigned int sym_index, unsigned int shndx,
+ unsigned int got_type, Rel_dyn* rel_dyn,
+ unsigned int r_type_1, unsigned int r_type_2);
+
+ void
+ add_local_pair_with_rela(Sized_relobj<size, big_endian>* object,
+ unsigned int sym_index, unsigned int shndx,
+ unsigned int got_type, Rela_dyn* rela_dyn,
+ unsigned int r_type_1, unsigned int r_type_2);
+
+ // 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)
+ {
+ this->entries_.push_back(Got_entry(constant));
+ this->set_got_size();
+ return this->last_got_offset();
+ }
+
+ 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")); }
+
+ private:
+ // This POD class holds a single GOT entry.
+ class Got_entry
+ {
+ public:
+ // Create a zero entry.
+ Got_entry()
+ : local_sym_index_(CONSTANT_CODE)
+ { this->u_.constant = 0; }
+
+ // Create a global symbol entry.
+ explicit Got_entry(Symbol* gsym)
+ : local_sym_index_(GSYM_CODE)
+ { this->u_.gsym = gsym; }
+
+ // Create a local symbol entry.
+ Got_entry(Sized_relobj<size, big_endian>* object,
+ unsigned int local_sym_index)
+ : local_sym_index_(local_sym_index)
+ {
+ gold_assert(local_sym_index != GSYM_CODE
+ && local_sym_index != CONSTANT_CODE);
+ 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)
+ { this->u_.constant = constant; }
+
+ // Write the GOT entry to an output view.
+ void
+ write(unsigned char* pov) const;
+
+ private:
+ enum
+ {
+ GSYM_CODE = -1U,
+ CONSTANT_CODE = -2U
+ };
+
+ union
+ {
+ // For a local symbol, the object.
+ Sized_relobj<size, big_endian>* 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_;
+ };
+
+ typedef std::vector<Got_entry> Got_entries;
+
+ // Return the offset into the GOT of GOT entry I.
+ unsigned int
+ got_offset(unsigned int i) const
+ { return i * (size / 8); }
+
+ // Return the offset into the GOT of the last entry added.
+ unsigned int
+ last_got_offset() const
+ { return this->got_offset(this->entries_.size() - 1); }
+
+ // Set the size of the section.
+ void
+ set_got_size()
+ { this->set_current_data_size(this->got_offset(this->entries_.size())); }
+
+ // The list of GOT entries.
+ Got_entries entries_;
+};
+
+// 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 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()); }
+
+ 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; }
+
+ // 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; }
+
+ // 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
+ // 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_;
+ // 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_; }
+
+ private:
+ Relobj* relobj_;
+ unsigned int shndx_;
+};
+
+// 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(Sized_relobj<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 to this output section.
+ void
+ add_relaxed_input_section(Output_relaxed_input_section* poris);
+
+ // 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_; }
+
+ // 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; }
+
+ // 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;
+ }
+
+ // 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; }
+
+ // 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; }
+
+ // 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 section holds relro local data--relro data for which
+ // the dynamic relocations are all RELATIVE relocations.
+ bool
+ is_relro_local() const
+ { return this->is_relro_local_; }
+
+ // Record that this section holds relro local data.
+ void
+ set_is_relro_local()
+ { this->is_relro_local_ = true; }
+
+ // 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_; }
+
+ // 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.
+
+ // We need to export the input sections to linker scripts. Previously
+ // we export a pair of Relobj pointer and section index. We now need to
+ // handle relaxed input sections as well. So we use this class.
+ class Simple_input_section
+ {
+ private:
+ static const unsigned int invalid_shndx = static_cast<unsigned int>(-1);
+
+ public:
+ Simple_input_section(Relobj *relobj, unsigned int shndx)
+ : shndx_(shndx)
+ {
+ gold_assert(shndx != invalid_shndx);
+ this->u_.relobj = relobj;
+ }
+
+ Simple_input_section(Output_relaxed_input_section* section)
+ : shndx_(invalid_shndx)
+ { this->u_.relaxed_input_section = section; }
+
+ // Whether this is a relaxed section.
+ bool
+ is_relaxed_input_section() const
+ { return this->shndx_ == invalid_shndx; }
+
+ // Return object of an input section.
+ Relobj*
+ relobj() const
+ {
+ return ((this->shndx_ != invalid_shndx)
+ ? this->u_.relobj
+ : this->u_.relaxed_input_section->relobj());
+ }
+
+ // Return index of an input section.
+ unsigned int
+ shndx() const
+ {
+ return ((this->shndx_ != invalid_shndx)
+ ? this->shndx_
+ : this->u_.relaxed_input_section->shndx());
+ }
+
+ // Return the Output_relaxed_input_section object of a relaxed section.
+ Output_relaxed_input_section*
+ relaxed_input_section() const
+ {
+ gold_assert(this->shndx_ == invalid_shndx);
+ return this->u_.relaxed_input_section;
+ }
+
+ private:
+ // Pointer to either an Relobj or an Output_relaxed_input_section.
+ union
+ {
+ Relobj* relobj;
+ Output_relaxed_input_section* relaxed_input_section;
+ } u_;
+ // Section index for an non-relaxed section or invalid_shndx for
+ // a relaxed section.
+ unsigned int shndx_;
+ };
+
+ // 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<Simple_input_section>*);
+
+ // Add an input section from a script.
+ void
+ add_input_section_for_script(const Simple_input_section& input_section,
+ off_t data_size, uint64_t addralign);
+
+ // Set the current size of the output section.
+ void
+ set_current_data_size(off_t size)
+ { this->set_current_data_size_for_child(size); }
+
+ // Get the current size of the output section.
+ off_t
+ current_data_size() const
+ { return this->current_data_size_for_child(); }
+
+ // 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();
+
+ // Convert existing input sections to relaxed input sections.
+ void
+ convert_input_sections_to_relaxed_sections(
+ const std::vector<Output_relaxed_input_section*>& sections);
+
+ // Print merge statistics to stderr.
+ void
+ print_merge_stats();
+
+ protected:
+ // Return the output section--i.e., the object itself.
+ Output_section*
+ do_output_section()
+ { 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;
+ }
+
+ // 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();
+
+ // 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)))
+ {
+ 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)
+ {
+ 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)
+ {
+ 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)
+ {
+ this->u1_.data_size = 0;
+ this->u2_.poris = psection;
+ }
+
+ // The required alignment.
+ uint64_t
+ addralign() const
+ {
+ if (!this->is_input_section())
+ return this->u2_.posd->addralign();
+ return (this->p2align_ == 0
+ ? 0
+ : static_cast<uint64_t>(1) << (this->p2align_ - 1));
+ }
+
+ // 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 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
+ {
+ if (this->is_input_section())
+ return this->u2_.object;
+ else if (this->is_relaxed_input_section())
+ return this->u2_.poris->relobj();
+ else
+ gold_unreachable();
+ }
+
+ // Return the input section index for an input section.
+ unsigned int
+ shndx() const
+ {
+ if (this->is_input_section())
+ return this->shndx_;
+ else if (this->is_relaxed_input_section())
+ return this->u2_.poris->shndx();
+ else
+ gold_unreachable();
+ }
+
+ // 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;
+ }
+
+ // 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;
+ // For RELAXED_INPUT_SECTION_CODE, the data.
+ Output_relaxed_input_section* poris;
+ } u2_;
+ };
+
+ typedef std::vector<Input_section> Input_section_list;
+
+ // Allow a child class to access the input sections.
+ const Input_section_list&
+ input_sections() const
+ { return this->input_sections_; }
+
+ 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_; }
+
+ // 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.
+ struct Input_section_sort_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;
+
+ // 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_;
+ };
+
+ // Map that link Merge_section_properties to Output_merge_base.
+ typedef Unordered_map<Merge_section_properties, Output_merge_base*,
+ Merge_section_properties::hash,
+ Merge_section_properties::equal_to>
+ Merge_section_by_properties_map;
+
+ // Map that link Input_section_specifier to Output_section_data.
+ typedef Unordered_map<Input_section_specifier, Output_section_data*,
+ Input_section_specifier::hash,
+ Input_section_specifier::equal_to>
+ Output_section_data_by_input_section_map;
+
+ // Map used during relaxation of existing sections. This map
+ // an input section specifier to an input section list index.
+ // We assume that Input_section_list is a vector.
+ typedef Unordered_map<Input_section_specifier, size_t,
+ Input_section_specifier::hash,
+ Input_section_specifier::equal_to>
+ 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.
+ bool
+ add_merge_input_section(Relobj* object, unsigned int shndx, uint64_t flags,
+ uint64_t entsize, uint64_t addralign);
+
+ // 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);
+
+ // Sort the attached input sections.
+ void
+ sort_attached_input_sections();
+
+ // 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;
+
+ // Find a relaxed input section to an input section in OBJECT
+ // with index SHNDX. Return NULL if none is found.
+ const Output_section_data*
+ find_relaxed_input_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);
+
+ // 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 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 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 section holds relro local data.
+ bool is_relro_local_ : 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;
+ // For SHT_TLS sections, the offset of this section relative to the base
+ // of the TLS segment.
+ uint64_t tls_offset_;
+ // Saved checkpoint.
+ Checkpoint_output_section* checkpoint_;
+ // Map from input sections to merge sections.
+ Output_section_data_by_input_section_map merge_section_map_;
+ // Map from merge section properties to merge_sections;
+ Merge_section_by_properties_map merge_section_by_properties_map_;
+ // Map from input sections to relaxed input sections. This is mutable
+ // beacause it is udpated lazily. We may need to update it in a
+ // const qualified method.
+ mutable Output_section_data_by_input_section_map relaxed_input_section_map_;
+ // Whether relaxed_input_section_map_ is valid.
+ mutable bool is_relaxed_input_section_map_valid_;
+ // Whether code-fills are generated at write.
+ bool generate_code_fills_at_write_;
+};
+
+// 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; }
+
+ // Return the maximum alignment of the Output_data.
+ uint64_t
+ maximum_alignment();
+
+ // Add an Output_section to this segment.
+ void
+ add_output_section(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 is not 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
+ { return !this->output_data_.empty(); }
+
+ // Return the number of dynamic relocations applied to this segment.
+ unsigned int
+ dynamic_reloc_count() const;
+
+ // Return the address of the first section.
+ uint64_t
+ first_section_load_address() const;
+
+ // 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;
+ }
+
+ // 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 Layout*, bool reset, uint64_t addr, 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)
+ { 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();
+
+ // 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::list<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(const Layout*, bool reset, Output_data_list*,
+ uint64_t addr, off_t* poff, unsigned int* pshndx,
+ bool* in_tls, bool* in_relro);
+
+ // Return the number of Output_sections in an Output_data_list.
+ unsigned int
+ output_section_count_list(const Output_data_list*) const;
+
+ // Return the number of dynamic relocs in an Output_data_list.
+ unsigned int
+ dynamic_reloc_count_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;
+
+ // Write the section headers in the list into V.
+ template<int size, bool big_endian>
+ unsigned char*
+ write_section_headers_list(const Layout*, const Stringpool*,
+ const Output_data_list*, unsigned char* v,
+ unsigned int* pshdx) const;
+
+ // Print a section list to the mapfile.
+ void
+ print_section_list_to_mapfile(Mapfile*, const Output_data_list*) const;
+
+ // NOTE: We want to use the copy constructor. Currently, shallow copy
+ // works for us so we do not need to write our own copy constructor.
+
+ // The list of output data with contents attached to this segment.
+ Output_data_list output_data_;
+ // The list of output data without contents attached to this segment.
+ Output_data_list output_bss_;
+ // The segment virtual address.
+ uint64_t vaddr_;
+ // The segment physical address.
+ uint64_t paddr_;
+ // The size of the segment in memory.
+ uint64_t memsz_;
+ // The maximum section alignment. The is_max_align_known_ field
+ // indicates whether this has been finalized.
+ uint64_t max_align_;
+ // The required minimum value for the p_align field. This is used
+ // for PT_LOAD segments. Note that this does not mean that
+ // addresses should be aligned to this value; it means the p_paddr
+ // and p_vaddr fields must be congruent modulo this value. For
+ // non-PT_LOAD segments, the dynamic linker works more efficiently
+ // if the p_align field has the more conventional value, although it
+ // can align as needed.
+ uint64_t min_p_align_;
+ // The offset of the segment data within the file.
+ off_t offset_;
+ // The size of the segment data in the file.
+ off_t filesz_;
+ // The segment type;
+ elfcpp::Elf_Word type_;
+ // The segment flags.
+ elfcpp::Elf_Word flags_;
+ // Whether we have finalized max_align_.
+ bool is_max_align_known_ : 1;
+ // Whether vaddr and paddr were set by a linker script.
+ bool are_addresses_set_ : 1;
+ // Whether this segment holds large data sections.
+ bool is_large_data_segment_ : 1;
+};
+
+// This class represents the output file.
+
+class Output_file
+{
+ public:
+ Output_file(const char* name);
+
+ // Indicate that this is a temporary file which should not be
+ // output.
+ void
+ set_is_temporary()
+ { this->is_temporary_ = true; }
+
+ // Try to open an existing file. Returns false if the file doesn't
+ // exist, has a size of 0 or can't be mmaped. This method is
+ // thread-unsafe.
+ bool
+ open_for_modification();
+
+ // Open the output file. FILE_SIZE is the final size of the file.
+ // If the file already exists, it is deleted/truncated. This method
+ // is thread-unsafe.
+ void
+ open(off_t file_size);
+
+ // Resize the output file. This method is thread-unsafe.
+ void
+ resize(off_t file_size);
+
+ // Close the output file (flushing all buffered data) and make sure
+ // there are no errors. This method is thread-unsafe.
+ void
+ close();
+
+ // Return the size of this file.
+ off_t
+ filesize()
+ { return this->file_size_; }
+
+ // We currently always use mmap which makes the view handling quite
+ // simple. In the future we may support other approaches.
+
+ // Write data to the output file.
+ void
+ write(off_t offset, const void* data, size_t len)
+ { memcpy(this->base_ + offset, data, len); }
+
+ // Get a buffer to use to write to the file, given the offset into
+ // the file and the size.
+ unsigned char*
+ get_output_view(off_t start, size_t size)
+ {
+ gold_assert(start >= 0
+ && start + static_cast<off_t>(size) <= this->file_size_);
+ return this->base_ + start;
+ }
+
+ // VIEW must have been returned by get_output_view. Write the
+ // buffer to the file, passing in the offset and the size.
+ void
+ write_output_view(off_t, size_t, unsigned char*)
+ { }
+
+ // Get a read/write buffer. This is used when we want to write part
+ // of the file, read it in, and write it again.
+ unsigned char*
+ get_input_output_view(off_t start, size_t size)
+ { return this->get_output_view(start, size); }
+
+ // Write a read/write buffer back to the file.
+ void
+ write_input_output_view(off_t, size_t, unsigned char*)
+ { }
+
+ // Get a read buffer. This is used when we just want to read part
+ // of the file back it in.
+ const unsigned char*
+ get_input_view(off_t start, size_t size)
+ { return this->get_output_view(start, size); }
+
+ // Release a read bfufer.
+ void
+ free_input_view(off_t, size_t, const unsigned char*)
+ { }
+
+ private:
+ // Map the file into memory or, if that fails, allocate anonymous
+ // memory.
+ void
+ map();
+
+ // Allocate anonymous memory for the file.
+ bool
+ map_anonymous();
+
+ // Map the file into memory.
+ bool
+ map_no_anonymous();
+
+ // Unmap the file from memory (and flush to disk buffers).
+ void
+ unmap();
+
+ // File name.
+ const char* name_;
+ // File descriptor.
+ int o_;
+ // File size.
+ off_t file_size_;
+ // Base of file mapped into memory.
+ unsigned char* base_;
+ // True iff base_ points to a memory buffer rather than an output file.
+ bool map_is_anonymous_;
+ // True if this is a temporary file which should not be output.
+ bool is_temporary_;
+};
+
+} // End namespace gold.
+
+#endif // !defined(GOLD_OUTPUT_H)
projects / msp430-binutils.git / blobdiff