#define GOLD_OUTPUT_H
#include <list>
+#include <vector>
#include "elfcpp.h"
+#include "layout.h"
+#include "reloc-types.h"
namespace gold
{
+class General_options;
class Object;
+class Symbol;
class Output_file;
+class Output_section;
+class Target;
+template<int size, bool big_endian>
+class Sized_target;
+template<int size, bool big_endian>
+class Sized_relobj;
-// An abtract class for data which has to go into the output file
-// which is not associated with any input section.
+// An abtract class for data which has to go into the output file.
class Output_data
{
public:
- Output_data(off_t size = 0)
- : size_(size)
+ explicit Output_data(off_t data_size = 0)
+ : address_(0), data_size_(data_size), offset_(-1)
{ }
virtual
~Output_data();
- // Return the size of the data.
+ // Return the address. This is only valid after Layout::finalize is
+ // finished.
+ uint64_t
+ address() const
+ { return this->address_; }
+
+ // Return the size of the data. This must be valid after
+ // Layout::finalize calls set_address, but need not be valid before
+ // then.
off_t
- size()
- { return this->size_; }
+ data_size() const
+ { return this->data_size_; }
- // Write the data to the output file at the specified offset. This
- // must be implemented by the real class.
- virtual void
- write(Output_file*, off_t off) = 0;
+ // Return the file offset. This is only valid after
+ // Layout::finalize is finished.
+ off_t
+ offset() const
+ { return this->offset_; }
+
+ // Return the required alignment.
+ uint64_t
+ addralign() const
+ { return this->do_addralign(); }
+
+ // 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 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. This is called
+ // during Layout::finalize.
+ void
+ set_address(uint64_t addr, off_t off);
+
+ // 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 all sizes must
+ // now be fixed.
+ static void
+ layout_complete()
+ { Output_data::sizes_are_fixed = true; }
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 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 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(); }
+
+ // Set the address and file offset of the data. This only needs to
+ // be implemented if the child needs to know. The child class can
+ // set its size in this call.
+ virtual void
+ do_set_address(uint64_t, off_t)
+ { }
+
+ // Functions that child classes may call.
+
// Set the size of the data.
void
- set_size(off_t size)
- { this->size_ = size; }
+ set_data_size(off_t data_size)
+ {
+ gold_assert(!Output_data::sizes_are_fixed);
+ this->data_size_ = data_size;
+ }
+
+ // Return default alignment for a size--32 or 64.
+ static uint64_t
+ default_alignment(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 after we set the section addresses.
+ static bool sizes_are_fixed;
+
+ // Memory address in file (not always meaningful).
+ uint64_t address_;
// Size of data in file.
- off_t size_;
+ off_t data_size_;
+ // Offset within file.
+ off_t offset_;
};
-// A simple cass of Output_data in which we have constant data to
+// Output the section headers.
+
+class Output_section_headers : public Output_data
+{
+ public:
+ Output_section_headers(int size,
+ bool big_endian,
+ const Layout::Segment_list&,
+ const Layout::Section_list&,
+ const Stringpool*);
+
+ // 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(this->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*);
+
+ int size_;
+ bool big_endian_;
+ const Layout::Segment_list& segment_list_;
+ const Layout::Section_list& unattached_section_list_;
+ const Stringpool* secnamepool_;
+};
+
+// Output the segment headers.
+
+class Output_segment_headers : public Output_data
+{
+ public:
+ Output_segment_headers(int size, bool big_endian,
+ const Layout::Segment_list& segment_list);
+
+ // 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(this->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*);
+
+ int size_;
+ bool big_endian_;
+ const Layout::Segment_list& segment_list_;
+};
+
+// Output the ELF file header.
+
+class Output_file_header : public Output_data
+{
+ public:
+ Output_file_header(int size,
+ bool big_endian,
+ const General_options&,
+ const Target*,
+ const Symbol_table*,
+ const Output_segment_headers*);
+
+ // Add information about the section headers. We lay out the ELF
+ // file header before we create the section headers.
+ void set_section_info(const Output_section_headers*,
+ const Output_section* shstrtab);
+
+ // 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(this->size_); }
+
+ // Set the address and offset--we only implement this for error
+ // checking.
+ void
+ do_set_address(uint64_t, off_t off) const
+ { gold_assert(off == 0); }
+
+ 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*);
+
+ int size_;
+ bool big_endian_;
+ const General_options& options_;
+ const Target* target_;
+ const Symbol_table* symtab_;
+ const Output_segment_headers* segment_header_;
+ const Output_section_headers* section_header_;
+ const Output_section* shstrtab_;
+};
+
+// Output sections are mainly comprised of input sections. However,
+// there are cases where we have data to write out which is not in an
+// input section. Output_section_data is used in such cases. This is
+// an abstract base class.
+
+class Output_section_data : public Output_data
+{
+ public:
+ Output_section_data(off_t data_size, uint64_t addralign)
+ : Output_data(data_size), output_section_(NULL), addralign_(addralign)
+ { }
+
+ Output_section_data(uint64_t addralign)
+ : Output_data(0), output_section_(NULL), addralign_(addralign)
+ { }
+
+ // Record the output section.
+ void
+ set_output_section(Output_section* os)
+ {
+ gold_assert(this->output_section_ == NULL);
+ this->output_section_ = os;
+ }
+
+ protected:
+ // The child class must implement do_write.
+
+ // Return the required alignment.
+ uint64_t
+ do_addralign() const
+ { return this->addralign_; }
+
+ // Return the section index of the output section.
+ unsigned int
+ do_out_shndx() const;
+
+ // Set the alignment.
+ void
+ set_addralign(uint64_t addralign)
+ { this->addralign_ = addralign; }
+
+ private:
+ // The output section for this section.
+ const Output_section* output_section_;
+ // The required alignment.
+ uint64_t addralign_;
+};
+
+// A simple case of Output_data in which we have constant data to
// output.
-class Output_data_const : public Output_data
+class Output_data_const : public Output_section_data
{
public:
- Output_data_const(const std::string& data)
- : Output_data(data.size()), data_(data)
+ Output_data_const(const std::string& data, uint64_t addralign)
+ : Output_section_data(data.size(), addralign), data_(data)
+ { }
+
+ Output_data_const(const char* p, off_t len, uint64_t addralign)
+ : Output_section_data(len, addralign), data_(p, len)
{ }
- Output_data_const(const char* p, off_t len)
- : Output_data(len), data_(p, len)
+ Output_data_const(const unsigned char* p, off_t len, uint64_t addralign)
+ : Output_section_data(len, addralign),
+ data_(reinterpret_cast<const char*>(p), len)
{ }
+ // Add more data.
void
- write(Output_file* output, off_t off);
+ add_data(const std::string& add)
+ {
+ this->data_.append(add);
+ this->set_data_size(this->data_.size());
+ }
+
+ // Write the data to the output file.
+ void
+ do_write(Output_file*);
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)
+ : Output_section_data(len, addralign), p_(p)
+ { }
+
+ // Write the data the output file.
+ void
+ do_write(Output_file*);
+
+ private:
+ const unsigned char* p_;
+};
+
+// A place holder for data written out via some other mechanism.
+
+class Output_data_space : public Output_section_data
+{
+ public:
+ Output_data_space(off_t data_size, uint64_t addralign)
+ : Output_section_data(data_size, addralign)
+ { }
+
+ explicit Output_data_space(uint64_t addralign)
+ : Output_section_data(addralign)
+ { }
+
+ // Set the size.
+ void
+ set_space_size(off_t space_size)
+ { this->set_data_size(space_size); }
+
+ // Set the alignment.
+ void
+ set_space_alignment(uint64_t align)
+ { this->set_addralign(align); }
+
+ // Write out the data--this must be handled elsewhere.
+ void
+ do_write(Output_file*)
+ { }
+};
+
+// 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)
+ { }
+
+ // This is called to set the address and file offset. Here we make
+ // sure that the Stringpool is finalized.
+ void
+ do_set_address(uint64_t, off_t);
+
+ // Write out the data.
+ void
+ do_write(Output_file*);
+
+ 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, 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;
+
+ // 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)
+ { }
+
+ // A reloc against a global symbol.
+
+ Output_reloc(Symbol* gsym, unsigned int type, Output_data* od,
+ Address address)
+ : address_(address), local_sym_index_(GSYM_CODE), type_(type),
+ shndx_(INVALID_CODE)
+ {
+ this->u1_.gsym = gsym;
+ this->u2_.od = od;
+ }
+
+ Output_reloc(Symbol* gsym, unsigned int type, Relobj* relobj,
+ unsigned int shndx, Address address)
+ : address_(address), local_sym_index_(GSYM_CODE), type_(type),
+ shndx_(shndx)
+ {
+ gold_assert(shndx != INVALID_CODE);
+ this->u1_.gsym = gsym;
+ this->u2_.relobj = relobj;
+ }
+
+ // 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)
+ : address_(address), local_sym_index_(local_sym_index), type_(type),
+ shndx_(INVALID_CODE)
+ {
+ gold_assert(local_sym_index != GSYM_CODE
+ && local_sym_index != INVALID_CODE);
+ this->u1_.relobj = relobj;
+ this->u2_.od = od;
+ }
+
+ Output_reloc(Sized_relobj<size, big_endian>* relobj,
+ unsigned int local_sym_index,
+ unsigned int type,
+ unsigned int shndx,
+ Address address)
+ : address_(address), local_sym_index_(local_sym_index), type_(type),
+ shndx_(shndx)
+ {
+ gold_assert(local_sym_index != GSYM_CODE
+ && local_sym_index != INVALID_CODE);
+ gold_assert(shndx != INVALID_CODE);
+ this->u1_.relobj = relobj;
+ this->u2_.relobj = relobj;
+ }
+
+ // A reloc against the STT_SECTION symbol of an output section.
+
+ Output_reloc(Output_section* os, unsigned int type, Output_data* od,
+ Address address)
+ : address_(address), local_sym_index_(SECTION_CODE), type_(type),
+ shndx_(INVALID_CODE)
+ {
+ this->u1_.os = os;
+ this->u2_.od = od;
+ }
+
+ Output_reloc(Output_section* os, unsigned int type, Relobj* relobj,
+ unsigned int shndx, Address address)
+ : address_(address), local_sym_index_(SECTION_CODE), type_(type),
+ shndx_(shndx)
+ {
+ gold_assert(shndx != INVALID_CODE);
+ this->u1_.os = os;
+ this->u2_.relobj = relobj;
+ }
+
+ // Write the reloc entry to an output view.
+ void
+ write(unsigned char* pov) const;
+
+ // Write the offset and info fields to Write_rel.
+ template<typename Write_rel>
+ void write_rel(Write_rel*) const;
+
+ private:
+ // Return the symbol index. We can't do a double template
+ // specialization, so we do a secondary template here.
+ unsigned int
+ get_symbol_index() 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, 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, the symbol. If this is NULL, it indicates
+ // a relocation against the undefined 0 symbol.
+ Symbol* gsym;
+ // For a relocation against an output section, the output section.
+ Output_section* os;
+ } u1_;
+ union
+ {
+ // If shndx_ is not INVALID CODE, the object which holds the input
+ // section being used to specify the reloc address.
+ Relobj* relobj;
+ // If 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_;
+ // For a local symbol, the local symbol index. This is GSYM_CODE
+ // for a global symbol, or INVALID_CODE for an uninitialized value.
+ unsigned int local_sym_index_;
+ // The reloc type--a processor specific code.
+ unsigned int type_;
+ // 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)
+ : rel_(gsym, type, od, address), addend_(addend)
+ { }
+
+ Output_reloc(Symbol* gsym, unsigned int type, Relobj* relobj,
+ unsigned int shndx, Address address, Addend addend)
+ : rel_(gsym, type, relobj, shndx, address), 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)
+ : rel_(relobj, local_sym_index, type, od, address), 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)
+ : rel_(relobj, local_sym_index, type, shndx, address),
+ 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, Relobj* 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;
+
+ 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
+{
+ 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()
+ : Output_section_data(Output_data::default_alignment(size))
+ { }
+
+ // Write out the data.
+ void
+ do_write(Output_file*);
+
+ protected:
+ // Add a relocation entry.
+ void
+ add(const Output_reloc_type& reloc)
+ {
+ this->relocs_.push_back(reloc);
+ this->set_data_size(this->relocs_.size() * reloc_size);
+ }
+
+ private:
+ typedef std::vector<Output_reloc_type> Relocs;
+
+ Relocs relocs_;
+};
+
+// The class which callers actually create.
+
+template<int sh_type, bool dynamic, int size, bool big_endian>
+class Output_data_reloc;
+
+// The SHT_REL version of Output_data_reloc.
+
+template<bool dynamic, int size, bool big_endian>
+class Output_data_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>
+ : public Output_data_reloc_base<elfcpp::SHT_REL, dynamic, size, big_endian>
+{
+ private:
+ typedef Output_data_reloc_base<elfcpp::SHT_REL, dynamic, size,
+ big_endian> Base;
+
+ public:
+ typedef typename Base::Output_reloc_type Output_reloc_type;
+ typedef typename Output_reloc_type::Address Address;
+
+ Output_data_reloc()
+ : Output_data_reloc_base<elfcpp::SHT_REL, dynamic, size, big_endian>()
+ { }
+
+ // Add a reloc against a global symbol.
+
+ void
+ add_global(Symbol* gsym, unsigned int type, Output_data* od, Address address)
+ { this->add(Output_reloc_type(gsym, type, od, address)); }
+
+ void
+ add_global(Symbol* gsym, unsigned int type, Relobj* relobj,
+ unsigned int shndx, Address address)
+ { this->add(Output_reloc_type(gsym, type, relobj, shndx, address)); }
+
+ // 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(Output_reloc_type(relobj, local_sym_index, type, od, address)); }
+
+ void
+ add_local(Sized_relobj<size, big_endian>* relobj,
+ unsigned int local_sym_index, unsigned int type,
+ unsigned int shndx, Address address)
+ { this->add(Output_reloc_type(relobj, local_sym_index, type, shndx,
+ address)); }
+
+
+ // 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)
+ { this->add(Output_reloc_type(os, type, od, address)); }
+
+ void
+ add_output_section(Output_section* os, unsigned int type,
+ Relobj* relobj, unsigned int shndx, Address address)
+ { this->add(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()
+ : Output_data_reloc_base<elfcpp::SHT_RELA, dynamic, size, big_endian>()
+ { }
+
+ // Add a reloc against a global symbol.
+
+ void
+ add_global(Symbol* gsym, unsigned int type, Output_data* od,
+ Address address, Addend addend)
+ { this->add(Output_reloc_type(gsym, type, od, address, addend)); }
+
+ void
+ add_global(Symbol* gsym, unsigned int type, Relobj* relobj,
+ unsigned int shndx, Address address, Addend addend)
+ { this->add(Output_reloc_type(gsym, type, relobj, shndx, address, addend)); }
+
+ // 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(Output_reloc_type(relobj, local_sym_index, type, od, address,
+ addend));
+ }
+
+ void
+ add_local(Sized_relobj<size, big_endian>* relobj,
+ unsigned int local_sym_index, unsigned int type,
+ unsigned int shndx, Address address, Addend addend)
+ {
+ this->add(Output_reloc_type(relobj, local_sym_index, type, shndx, address,
+ addend));
+ }
+
+ // 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(Output_reloc_type(os, type, od, address, addend)); }
+
+ void
+ add_output_section(Output_section* os, unsigned int type, Relobj* relobj,
+ unsigned int shndx, Address address, Addend addend)
+ { this->add(Output_reloc_type(os, type, relobj, shndx, address, addend)); }
+};
+
+// 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
+{
+ public:
+ typedef typename elfcpp::Elf_types<size>::Elf_Addr Valtype;
+
+ Output_data_got(const General_options* options)
+ : Output_section_data(Output_data::default_alignment(size)),
+ options_(options), 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);
+
+ // Add an entry for a local symbol to the GOT. This returns the
+ // offset of the new entry from the start of the GOT.
+ unsigned int
+ add_local(Object* object, unsigned int sym_index)
+ {
+ this->entries_.push_back(Got_entry(object, sym_index));
+ this->set_got_size();
+ return this->last_got_offset();
+ }
+
+ // 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();
+ }
+
+ // Write out the GOT table.
+ void
+ do_write(Output_file*);
+
+ 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(Object* 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(const General_options*, unsigned char* pov) const;
+
+ private:
+ enum
+ {
+ GSYM_CODE = -1U,
+ CONSTANT_CODE = -2U
+ };
+
+ union
+ {
+ // For a local symbol, the object.
+ Object* 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_data_size(this->got_offset(this->entries_.size())); }
+
+ // Options.
+ const General_options* options_;
+ // 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(const Target* target, Stringpool* pool)
+ : Output_section_data(Output_data::default_alignment(target->get_size())),
+ target_(target), 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 a section.
+ void
+ add_section_address(elfcpp::DT tag, Output_section* os)
+ { this->add_entry(Dynamic_entry(tag, os, false)); }
+
+ // Add a new dynamic entry with the size of a section.
+ void
+ add_section_size(elfcpp::DT tag, Output_section* os)
+ { this->add_entry(Dynamic_entry(tag, os, true)); }
+
+ // Add a new dynamic entry with the address of a symbol.
+ void
+ add_symbol(elfcpp::DT tag, 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, NULL))); }
+
+ // Set the final data size.
+ void
+ do_set_address(uint64_t, off_t);
+
+ // Write out the dynamic entries.
+ void
+ do_write(Output_file*);
+
+ 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), classification_(DYNAMIC_NUMBER)
+ { this->u_.val = val; }
+
+ // Create an entry with the size or address of a section.
+ Dynamic_entry(elfcpp::DT tag, Output_section* os, bool section_size)
+ : tag_(tag),
+ classification_(section_size
+ ? DYNAMIC_SECTION_SIZE
+ : DYNAMIC_SECTION_ADDRESS)
+ { this->u_.os = os; }
+
+ // Create an entry with the address of a symbol.
+ Dynamic_entry(elfcpp::DT tag, Symbol* sym)
+ : tag_(tag), classification_(DYNAMIC_SYMBOL)
+ { this->u_.sym = sym; }
+
+ // Create an entry with a string.
+ Dynamic_entry(elfcpp::DT tag, const char* str)
+ : tag_(tag), classification_(DYNAMIC_STRING)
+ { this->u_.str = str; }
+
+ // Write the dynamic entry to an output view.
+ template<int size, bool big_endian>
+ void
+ write(unsigned char* pov, const Stringpool*) const;
+
+ private:
+ enum Classification
+ {
+ // Number.
+ DYNAMIC_NUMBER,
+ // Section address.
+ DYNAMIC_SECTION_ADDRESS,
+ // Section size.
+ DYNAMIC_SECTION_SIZE,
+ // Symbol adress.
+ DYNAMIC_SYMBOL,
+ // String.
+ DYNAMIC_STRING
+ };
+
+ union
+ {
+ // For DYNAMIC_NUMBER.
+ unsigned int val;
+ // For DYNAMIC_SECTION_ADDRESS and DYNAMIC_SECTION_SIZE.
+ Output_section* os;
+ // For DYNAMIC_SYMBOL.
+ Symbol* sym;
+ // For DYNAMIC_STRING.
+ const char* str;
+ } u_;
+ // The dynamic tag.
+ elfcpp::DT tag_;
+ // The type of entry.
+ Classification classification_;
+ };
+
+ // 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 target.
+ const Target* target_;
+ // The entries.
+ Dynamic_entries entries_;
+ // The pool used for strings.
+ Stringpool* pool_;
+};
+
// 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
+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);
- ~Output_section();
+ Output_section(const char* name, elfcpp::Elf_Word, elfcpp::Elf_Xword,
+ bool may_add_data);
+ virtual ~Output_section();
- // Add a new input section named NAME with header SHDR from object
- // OBJECT. Return the offset within the output section.
+ // Add a new input section SHNDX, named NAME, with header SHDR, from
+ // object OBJECT. Return the offset within the output section.
template<int size, bool big_endian>
off_t
- add_input_section(Object* object, const char *name,
+ add_input_section(Relobj* object, unsigned int shndx, const char *name,
const elfcpp::Shdr<size, big_endian>& shdr);
+ // Add generated data ODATA to this output section.
+ void
+ add_output_section_data(Output_section_data* posd);
+
// Return the section name.
const char*
name() const
flags() const
{ return this->flags_; }
+ // Return the section index in the output file.
+ unsigned int
+ do_out_shndx() const
+ { return this->out_shndx_; }
+
+ // Set the output section index.
+ void
+ do_set_out_shndx(unsigned int shndx)
+ { this->out_shndx_ = shndx; }
+
+ // Return the entsize field.
+ uint64_t
+ entsize() const
+ { return this->entsize_; }
+
+ // Set the entsize field.
+ void
+ set_entsize(uint64_t v)
+ { this->entsize_ = v; }
+
+ // Set the link field.
+ void
+ set_link(unsigned int v)
+ { this->link_ = v; }
+
+ // Set the info field.
+ void
+ set_info(unsigned int v)
+ { this->info_ = v; }
+
+ // Set the addralign field.
+ void
+ set_addralign(uint64_t v)
+ { this->addralign_ = v; }
+
+ // 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;
+ }
+
+ // Set the address 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 the final addresses
+ // here.
+ void
+ do_set_address(uint64_t, off_t);
+
+ // 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.
+ void
+ do_write(Output_file*);
+
+ // Return the address alignment--function required by parent class.
+ uint64_t
+ do_addralign() const
+ { return this->addralign_; }
+
+ // 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; }
+
+ // Write the section header into *OPHDR.
+ template<int size, bool big_endian>
+ void
+ write_header(const Stringpool*, elfcpp::Shdr_write<size, big_endian>*) const;
+
private:
+ // 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), data_size_(0)
+ { this->u_.object = NULL; }
+
+ Input_section(Relobj* object, unsigned int shndx, off_t data_size,
+ uint64_t addralign)
+ : shndx_(shndx),
+ p2align_(ffsll(static_cast<long long>(addralign))),
+ data_size_(data_size)
+ {
+ gold_assert(shndx != -1U);
+ this->u_.object = object;
+ }
+
+ Input_section(Output_section_data* posd)
+ : shndx_(-1U),
+ p2align_(ffsll(static_cast<long long>(posd->addralign()))),
+ data_size_(0)
+ { this->u_.posd = posd; }
+
+ // The required alignment.
+ uint64_t
+ addralign() const
+ {
+ return (this->p2align_ == 0
+ ? 0
+ : static_cast<uint64_t>(1) << (this->p2align_ - 1));
+ }
+
+ // Return the required size.
+ off_t
+ data_size() const;
+
+ // Set the address and file offset. This is called during
+ // Layout::finalize. SECOFF is the file offset of the enclosing
+ // section.
+ void
+ set_address(uint64_t addr, off_t off, off_t secoff);
+
+ // Write out the data. This does nothing for an input section.
+ void
+ write(Output_file*);
+
+ private:
+ // Whether this is an input section.
+ bool
+ is_input_section() const
+ { return this->shndx_ != -1U; }
+
+ // For an ordinary input section, this is the section index in
+ // the input file. For an Output_section_data, this is -1U.
+ unsigned int shndx_;
+ // The required alignment, stored as a power of 2.
+ unsigned int p2align_;
+ // For an ordinary input section, the section size.
+ off_t data_size_;
+ union
+ {
+ // If shndx_ != -1U, this points to the object which holds the
+ // input section.
+ Relobj* object;
+ // If shndx_ == -1U, this is the data to write out.
+ Output_section_data* posd;
+ } u_;
+ };
+
+ typedef std::vector<Input_section> Input_section_list;
+
// 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.
- uint64_t addr_;
+ // The section address is in the parent class.
// The section alignment.
uint64_t addralign_;
// The section entry size.
uint64_t entsize_;
- // The file offset.
- off_t offset_;
- // The section size.
- off_t size_;
+ // The file offset is in the parent class.
// The section link field.
unsigned int link_;
// The section info field.
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_;
+ // Whether we permit adding data.
+ bool may_add_data_ : 1;
+ // 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;
};
// An output segment. PT_LOAD segments are built from collections of
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 maximum alignment of the Output_data.
+ uint64_t
+ addralign();
+
// Add an Output_section to this segment.
void
- add_output_section(Output_section*);
+ add_output_section(Output_section* os, elfcpp::Elf_Word seg_flags)
+ { this->add_output_section(os, seg_flags, false); }
+
+ // Add an Output_section to the start of this segment.
+ void
+ add_initial_output_section(Output_section* os, elfcpp::Elf_Word seg_flags)
+ { this->add_output_section(os, seg_flags, true); }
+
+ // Add an Output_data (which is not an Output_section) to the start
+ // of this segment.
+ void
+ add_initial_output_data(Output_data*);
+
+ // Set the address of the segment to ADDR and the offset to *POFF
+ // (aligned if necessary), and set the addresses and offsets of all
+ // contained output sections accordingly. Set the section indexes
+ // of all contained output sections starting with *PSHNDX. 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(uint64_t addr, off_t* poff, unsigned int* pshndx);
+
+ // Set the offset of this segment based on the section. This should
+ // only be called for a non-PT_LOAD segment.
+ void
+ set_offset();
+
+ // Return the number of output sections.
+ unsigned int
+ output_section_count() const;
- // Update the segment flags to be compatible with FLAGS.
+ // Write the segment header into *OPHDR.
+ template<int size, bool big_endian>
void
- update_flags(elfcpp::Elf_Word flags)
- { this->flags_ |= flags & (elfcpp::PF_R | elfcpp::PF_W | elfcpp::PF_X); }
+ 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 Stringpool*,
+ unsigned char* v,
+ unsigned int* pshndx ACCEPT_SIZE_ENDIAN) const;
private:
Output_segment(const Output_segment&);
Output_segment& operator=(const Output_segment&);
- typedef std::list<Output_section*> Section_list;
+ typedef std::list<Output_data*> Output_data_list;
+
+ // Add an Output_section to this segment, specifying front or back.
+ void
+ add_output_section(Output_section*, elfcpp::Elf_Word seg_flags,
+ bool front);
+
+ // Find the maximum alignment in an Output_data_list.
+ static uint64_t
+ maximum_alignment(const Output_data_list*);
+
+ // Set the section addresses in an Output_data_list.
+ uint64_t
+ set_section_list_addresses(Output_data_list*, uint64_t addr, off_t* poff,
+ unsigned int* pshndx);
+
+ // Return the number of Output_sections in an Output_data_list.
+ unsigned int
+ output_section_count_list(const Output_data_list*) const;
+
+ // Write the section headers in the list into V.
+ template<int size, bool big_endian>
+ unsigned char*
+ write_section_headers_list(const Stringpool*, const Output_data_list*,
+ unsigned char* v,
+ unsigned int* pshdx ACCEPT_SIZE_ENDIAN) const;
- // The list of output sections attached to this segment. This is
- // cleared after layout.
- Section_list output_sections_;
+ // 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.
elfcpp::Elf_Word type_;
// The segment flags.
elfcpp::Elf_Word flags_;
+ // Whether we have set align_.
+ bool is_align_known_;
};
-// This class represents the output file. The output file is a
-// collection of output segments and a collection of output sections
-// which are not associated with segments.
+// This class represents the output file.
class Output_file
{
public:
- Output_file();
- ~Output_file();
+ Output_file(const General_options& options);
+
+ // Open the output file. FILE_SIZE is the final size of the file.
+ void
+ open(off_t file_size);
+
+ // Close the output file and make sure there are no error.
+ void
+ close();
+
+ // 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 off, const void* data, off_t len);
+ write(off_t offset, const void* data, off_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, off_t size)
+ {
+ gold_assert(start >= 0 && size >= 0 && start + 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, off_t, unsigned char*)
+ { }
+
+ private:
+ // General options.
+ const General_options& options_;
+ // File name.
+ const char* name_;
+ // File descriptor.
+ int o_;
+ // File size.
+ off_t file_size_;
+ // Base of file mapped into memory.
+ unsigned char* base_;
};
} // End namespace gold.
projects / deliverable / binutils-gdb.git / blobdiff