[deliverable/binutils-gdb.git] / gold / reloc.cc

// reloc.cc -- relocate input files for gold.

#include "gold.h"

#include "workqueue.h"
#include "object.h"
#include "output.h"
#include "reloc.h"

namespace gold
{

// Read_relocs methods.

// These tasks just read the relocation information from the file.
// After reading it, the start another task to process the
// information.  These tasks requires access to the file.

Task::Is_runnable_type
Read_relocs::is_runnable(Workqueue*)
{
  return this->object_->is_locked() ? IS_LOCKED : IS_RUNNABLE;
}

// Lock the file.

Task_locker*
Read_relocs::locks(Workqueue*)
{
  return new Task_locker_obj<Object>(*this->object_);
}

// Read the relocations and then start a Scan_relocs_task.

void
Read_relocs::run(Workqueue* workqueue)
{
  Read_relocs_data *rd = new Read_relocs_data;
  this->object_->read_relocs(rd);
  workqueue->queue_front(new Scan_relocs(this->options_, this->symtab_,
					 this->layout_, this->object_, rd,
					 this->symtab_lock_, this->blocker_));
}

// Scan_relocs methods.

// These tasks scan the relocations read by Read_relocs and mark up
// the symbol table to indicate which relocations are required.  We
// use a lock on the symbol table to keep them from interfering with
// each other.

Task::Is_runnable_type
Scan_relocs::is_runnable(Workqueue*)
{
  if (!this->symtab_lock_->is_writable() || this->object_->is_locked())
    return IS_LOCKED;
  return IS_RUNNABLE;
}

// Return the locks we hold: one on the file, one on the symbol table
// and one blocker.

class Scan_relocs::Scan_relocs_locker : public Task_locker
{
 public:
  Scan_relocs_locker(Object* object, Task_token& symtab_lock, Task* task,
		     Task_token& blocker, Workqueue* workqueue)
    : objlock_(*object), symtab_locker_(symtab_lock, task),
      blocker_(blocker, workqueue)
  { }

 private:
  Task_locker_obj<Object> objlock_;
  Task_locker_write symtab_locker_;
  Task_locker_block blocker_;
};

Task_locker*
Scan_relocs::locks(Workqueue* workqueue)
{
  return new Scan_relocs_locker(this->object_, *this->symtab_lock_, this,
				*this->blocker_, workqueue);
}

// Scan the relocs.

void
Scan_relocs::run(Workqueue*)
{
  this->object_->scan_relocs(this->options_, this->symtab_, this->layout_,
			     this->rd_);
  delete this->rd_;
  this->rd_ = NULL;
}

// Relocate_task methods.

// These tasks are always runnable.

Task::Is_runnable_type
Relocate_task::is_runnable(Workqueue*)
{
  return IS_RUNNABLE;
}

// We want to lock the file while we run.  We want to unblock
// FINAL_BLOCKER when we are done.

class Relocate_task::Relocate_locker : public Task_locker
{
 public:
  Relocate_locker(Task_token& token, Workqueue* workqueue,
		  Object* object)
    : blocker_(token, workqueue), objlock_(*object)
  { }

 private:
  Task_locker_block blocker_;
  Task_locker_obj<Object> objlock_;
};

Task_locker*
Relocate_task::locks(Workqueue* workqueue)
{
  return new Relocate_locker(*this->final_blocker_, workqueue,
			     this->object_);
}

// Run the task.

void
Relocate_task::run(Workqueue*)
{
  this->object_->relocate(this->options_, this->symtab_, this->layout_,
			  this->of_);
}

// Read the relocs and local symbols from the object file and store
// the information in RD.

template<int size, bool big_endian>
void
Sized_relobj<size, big_endian>::do_read_relocs(Read_relocs_data* rd)
{
  rd->relocs.clear();

  unsigned int shnum = this->shnum();
  if (shnum == 0)
    return;

  rd->relocs.reserve(shnum / 2);

  const unsigned char *pshdrs = this->get_view(this->shoff_,
					       shnum * This::shdr_size);
  // Skip the first, dummy, section.
  const unsigned char *ps = pshdrs + This::shdr_size;
  for (unsigned int i = 1; i < shnum; ++i, ps += This::shdr_size)
    {
      typename This::Shdr shdr(ps);

      unsigned int sh_type = shdr.get_sh_type();
      if (sh_type != elfcpp::SHT_REL && sh_type != elfcpp::SHT_RELA)
	continue;

      unsigned int shndx = shdr.get_sh_info();
      if (shndx >= shnum)
	{
	  fprintf(stderr, _("%s: %s: relocation section %u has bad info %u\n"),
		  program_name, this->name().c_str(), i, shndx);
	  gold_exit(false);
	}

      if (!this->is_section_included(shndx))
	continue;

      // We are scanning relocations in order to fill out the GOT and
      // PLT sections.  Relocations for sections which are not
      // allocated (typically debugging sections) should not add new
      // GOT and PLT entries.  So we skip them.
      typename This::Shdr secshdr(pshdrs + shndx * This::shdr_size);
      if ((secshdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0)
	continue;

      if (shdr.get_sh_link() != this->symtab_shnum_)
	{
	  fprintf(stderr,
		  _("%s: %s: relocation section %u uses unexpected "
		    "symbol table %u\n"),
		  program_name, this->name().c_str(), i, shdr.get_sh_link());
	  gold_exit(false);
	}

      off_t sh_size = shdr.get_sh_size();

      unsigned int reloc_size;
      if (sh_type == elfcpp::SHT_REL)
	reloc_size = elfcpp::Elf_sizes<size>::rel_size;
      else
	reloc_size = elfcpp::Elf_sizes<size>::rela_size;
      if (reloc_size != shdr.get_sh_entsize())
	{
	  fprintf(stderr,
		  _("%s: %s: unexpected entsize for reloc section %u: "
		    "%lu != %u"),
		  program_name, this->name().c_str(), i,
		  static_cast<unsigned long>(shdr.get_sh_entsize()),
		  reloc_size);
	  gold_exit(false);
	}

      size_t reloc_count = sh_size / reloc_size;
      if (reloc_count * reloc_size != sh_size)
	{
	  fprintf(stderr, _("%s: %s: reloc section %u size %lu uneven"),
		  program_name, this->name().c_str(), i,
		  static_cast<unsigned long>(sh_size));
	  gold_exit(false);
	}

      rd->relocs.push_back(Section_relocs());
      Section_relocs& sr(rd->relocs.back());
      sr.reloc_shndx = i;
      sr.data_shndx = shndx;
      sr.contents = this->get_lasting_view(shdr.get_sh_offset(), sh_size);
      sr.sh_type = sh_type;
      sr.reloc_count = reloc_count;
    }

  // Read the local symbols.
  if (this->symtab_shnum_ == 0 || this->local_symbol_count_ == 0)
    rd->local_symbols = NULL;
  else
    {
      typename This::Shdr symtabshdr(pshdrs
				     + this->symtab_shnum_ * This::shdr_size);
      assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
      const int sym_size = This::sym_size;
      const unsigned int loccount = this->local_symbol_count_;
      assert(loccount == symtabshdr.get_sh_info());
      off_t locsize = loccount * sym_size;
      rd->local_symbols = this->get_lasting_view(symtabshdr.get_sh_offset(),
						 locsize);
    }
}

// Scan the relocs and adjust the symbol table.  This looks for
// relocations which require GOT/PLT/COPY relocations.

template<int size, bool big_endian>
void
Sized_relobj<size, big_endian>::do_scan_relocs(const General_options& options,
					       Symbol_table* symtab,
					       Layout* layout,
					       Read_relocs_data* rd)
{
  Sized_target<size, big_endian>* target = this->sized_target();

  const unsigned char* local_symbols;
  if (rd->local_symbols == NULL)
    local_symbols = NULL;
  else
    local_symbols = rd->local_symbols->data();

  for (Read_relocs_data::Relocs_list::iterator p = rd->relocs.begin();
       p != rd->relocs.end();
       ++p)
    {
      target->scan_relocs(options, symtab, layout, this, p->sh_type,
			  p->contents->data(), p->reloc_count,
			  this->local_symbol_count_,
			  local_symbols,
			  this->symbols_);
      delete p->contents;
      p->contents = NULL;
    }

  if (rd->local_symbols != NULL)
    {
      delete rd->local_symbols;
      rd->local_symbols = NULL;
    }
}

// Relocate the input sections and write out the local symbols.

template<int size, bool big_endian>
void
Sized_relobj<size, big_endian>::do_relocate(const General_options& options,
					    const Symbol_table* symtab,
					    const Layout* layout,
					    Output_file* of)
{
  unsigned int shnum = this->shnum();

  // Read the section headers.
  const unsigned char* pshdrs = this->get_view(this->shoff_,
					       shnum * This::shdr_size);

  Views views;
  views.resize(shnum);

  // Make two passes over the sections.  The first one copies the
  // section data to the output file.  The second one applies
  // relocations.

  this->write_sections(pshdrs, of, &views);

  // Apply relocations.

  this->relocate_sections(options, symtab, layout, pshdrs, &views);

  // Write out the accumulated views.
  for (unsigned int i = 1; i < shnum; ++i)
    {
      if (views[i].view != NULL)
	of->write_output_view(views[i].offset, views[i].view_size,
			      views[i].view);
    }

  // Write out the local symbols.
  this->write_local_symbols(of, layout->sympool());
}

// Write section data to the output file.  PSHDRS points to the
// section headers.  Record the views in *PVIEWS for use when
// relocating.

template<int size, bool big_endian>
void
Sized_relobj<size, big_endian>::write_sections(const unsigned char* pshdrs,
					       Output_file* of,
					       Views* pviews)
{
  unsigned int shnum = this->shnum();
  std::vector<Map_to_output>& map_sections(this->map_to_output());

  const unsigned char* p = pshdrs + This::shdr_size;
  for (unsigned int i = 1; i < shnum; ++i, p += This::shdr_size)
    {
      View_size* pvs = &(*pviews)[i];

      pvs->view = NULL;

      const Output_section* os = map_sections[i].output_section;
      if (os == NULL)
	continue;

      typename This::Shdr shdr(p);

      if (shdr.get_sh_type() == elfcpp::SHT_NOBITS)
	continue;

      off_t start = os->offset() + map_sections[i].offset;
      off_t sh_size = shdr.get_sh_size();

      if (sh_size == 0)
	continue;

      assert(map_sections[i].offset >= 0
	     && map_sections[i].offset + sh_size <= os->data_size());

      unsigned char* view = of->get_output_view(start, sh_size);
      this->read(shdr.get_sh_offset(), sh_size, view);

      pvs->view = view;
      pvs->address = os->address() + map_sections[i].offset;
      pvs->offset = start;
      pvs->view_size = sh_size;
    }
}

// Relocate section data.  VIEWS points to the section data as views
// in the output file.

template<int size, bool big_endian>
void
Sized_relobj<size, big_endian>::relocate_sections(
    const General_options& options,
    const Symbol_table* symtab,
    const Layout* layout,
    const unsigned char* pshdrs,
    Views* pviews)
{
  unsigned int shnum = this->shnum();
  Sized_target<size, big_endian>* target = this->sized_target();

  Relocate_info<size, big_endian> relinfo;
  relinfo.options = &options;
  relinfo.symtab = symtab;
  relinfo.layout = layout;
  relinfo.object = this;
  relinfo.local_symbol_count = this->local_symbol_count_;
  relinfo.values = this->values_;
  relinfo.symbols = this->symbols_;

  const unsigned char* p = pshdrs + This::shdr_size;
  for (unsigned int i = 1; i < shnum; ++i, p += This::shdr_size)
    {
      typename This::Shdr shdr(p);

      unsigned int sh_type = shdr.get_sh_type();
      if (sh_type != elfcpp::SHT_REL && sh_type != elfcpp::SHT_RELA)
	continue;

      unsigned int index = shdr.get_sh_info();
      if (index >= this->shnum())
	{
	  fprintf(stderr, _("%s: %s: relocation section %u has bad info %u\n"),
		  program_name, this->name().c_str(), i, index);
	  gold_exit(false);
	}

      if (!this->is_section_included(index))
	{
	  // This relocation section is against a section which we
	  // discarded.
	  continue;
	}

      assert((*pviews)[index].view != NULL);

      if (shdr.get_sh_link() != this->symtab_shnum_)
	{
	  fprintf(stderr,
		  _("%s: %s: relocation section %u uses unexpected "
		    "symbol table %u\n"),
		  program_name, this->name().c_str(), i, shdr.get_sh_link());
	  gold_exit(false);
	}

      off_t sh_size = shdr.get_sh_size();
      const unsigned char* prelocs = this->get_view(shdr.get_sh_offset(),
						    sh_size);

      unsigned int reloc_size;
      if (sh_type == elfcpp::SHT_REL)
	reloc_size = elfcpp::Elf_sizes<size>::rel_size;
      else
	reloc_size = elfcpp::Elf_sizes<size>::rela_size;

      if (reloc_size != shdr.get_sh_entsize())
	{
	  fprintf(stderr,
		  _("%s: %s: unexpected entsize for reloc section %u: "
		    "%lu != %u"),
		  program_name, this->name().c_str(), i,
		  static_cast<unsigned long>(shdr.get_sh_entsize()),
		  reloc_size);
	  gold_exit(false);
	}

      size_t reloc_count = sh_size / reloc_size;
      if (reloc_count * reloc_size != sh_size)
	{
	  fprintf(stderr, _("%s: %s: reloc section %u size %lu uneven"),
		  program_name, this->name().c_str(), i,
		  static_cast<unsigned long>(sh_size));
	  gold_exit(false);
	}

      relinfo.reloc_shndx = i;
      relinfo.data_shndx = index;
      target->relocate_section(&relinfo,
			       sh_type,
			       prelocs,
			       reloc_count,
			       (*pviews)[index].view,
			       (*pviews)[index].address,
			       (*pviews)[index].view_size);
    }
}

// Instantiate the templates we need.  We could use the configure
// script to restrict this to only the ones for implemented targets.

template
void
Sized_relobj<32, false>::do_read_relocs(Read_relocs_data* rd);

template
void
Sized_relobj<32, true>::do_read_relocs(Read_relocs_data* rd);

template
void
Sized_relobj<64, false>::do_read_relocs(Read_relocs_data* rd);

template
void
Sized_relobj<64, true>::do_read_relocs(Read_relocs_data* rd);

template
void
Sized_relobj<32, false>::do_scan_relocs(const General_options& options,
					Symbol_table* symtab,
					Layout* layout,
					Read_relocs_data* rd);

template
void
Sized_relobj<32, true>::do_scan_relocs(const General_options& options,
				       Symbol_table* symtab,
				       Layout* layout,
				       Read_relocs_data* rd);

template
void
Sized_relobj<64, false>::do_scan_relocs(const General_options& options,
					Symbol_table* symtab,
					Layout* layout,
					Read_relocs_data* rd);

template
void
Sized_relobj<64, true>::do_scan_relocs(const General_options& options,
				       Symbol_table* symtab,
				       Layout* layout,
				       Read_relocs_data* rd);

template
void
Sized_relobj<32, false>::do_relocate(const General_options& options,
				     const Symbol_table* symtab,
				     const Layout* layout,
				     Output_file* of);

template
void
Sized_relobj<32, true>::do_relocate(const General_options& options,
				    const Symbol_table* symtab,
				    const Layout* layout,
				    Output_file* of);

template
void
Sized_relobj<64, false>::do_relocate(const General_options& options,
				     const Symbol_table* symtab,
				     const Layout* layout,
				     Output_file* of);

template
void
Sized_relobj<64, true>::do_relocate(const General_options& options,
				    const Symbol_table* symtab,
				    const Layout* layout,
				    Output_file* of);


} // End namespace gold.
Commit	Line	Data
61ba1cf9 ILT	1	// reloc.cc -- relocate input files for gold.
	2
	3	#include "gold.h"
	4
	5	#include "workqueue.h"
	6	#include "object.h"
	7	#include "output.h"
	8	#include "reloc.h"
	9
	10	namespace gold
	11	{
	12
92e059d8 ILT	13	// Read_relocs methods.
	14
	15	// These tasks just read the relocation information from the file.
	16	// After reading it, the start another task to process the
	17	// information. These tasks requires access to the file.
	18
	19	Task::Is_runnable_type
	20	Read_relocs::is_runnable(Workqueue*)
	21	{
	22	return this->object_->is_locked() ? IS_LOCKED : IS_RUNNABLE;
	23	}
	24
	25	// Lock the file.
	26
	27	Task_locker*
	28	Read_relocs::locks(Workqueue*)
	29	{
	30	return new Task_locker_obj<Object>(*this->object_);
	31	}
	32
	33	// Read the relocations and then start a Scan_relocs_task.
	34
	35	void
	36	Read_relocs::run(Workqueue* workqueue)
	37	{
	38	Read_relocs_data *rd = new Read_relocs_data;
	39	this->object_->read_relocs(rd);
	40	workqueue->queue_front(new Scan_relocs(this->options_, this->symtab_,
ead1e424 ILT	41	this->layout_, this->object_, rd,
ead1e424 ILT	42	this->symtab_lock_, this->blocker_));
92e059d8 ILT	43	}
	44
	45	// Scan_relocs methods.
	46
	47	// These tasks scan the relocations read by Read_relocs and mark up
	48	// the symbol table to indicate which relocations are required. We
	49	// use a lock on the symbol table to keep them from interfering with
	50	// each other.
	51
	52	Task::Is_runnable_type
	53	Scan_relocs::is_runnable(Workqueue*)
	54	{
ead1e424 ILT	55	if (!this->symtab_lock_->is_writable() \|\| this->object_->is_locked())
	56	return IS_LOCKED;
	57	return IS_RUNNABLE;
92e059d8 ILT	58	}
	59
	60	// Return the locks we hold: one on the file, one on the symbol table
	61	// and one blocker.
	62
	63	class Scan_relocs::Scan_relocs_locker : public Task_locker
	64	{
	65	public:
	66	Scan_relocs_locker(Object* object, Task_token& symtab_lock, Task* task,
	67	Task_token& blocker, Workqueue* workqueue)
	68	: objlock_(*object), symtab_locker_(symtab_lock, task),
	69	blocker_(blocker, workqueue)
	70	{ }
	71
	72	private:
	73	Task_locker_obj<Object> objlock_;
	74	Task_locker_write symtab_locker_;
	75	Task_locker_block blocker_;
	76	};
	77
	78	Task_locker*
	79	Scan_relocs::locks(Workqueue* workqueue)
	80	{
	81	return new Scan_relocs_locker(this->object_, *this->symtab_lock_, this,
	82	*this->blocker_, workqueue);
	83	}
	84
	85	// Scan the relocs.
	86
	87	void
	88	Scan_relocs::run(Workqueue*)
	89	{
ead1e424 ILT	90	this->object_->scan_relocs(this->options_, this->symtab_, this->layout_,
ead1e424 ILT	91	this->rd_);
92e059d8 ILT	92	delete this->rd_;
	93	this->rd_ = NULL;
	94	}
	95
61ba1cf9 ILT	96	// Relocate_task methods.
	97
	98	// These tasks are always runnable.
	99
	100	Task::Is_runnable_type
	101	Relocate_task::is_runnable(Workqueue*)
	102	{
	103	return IS_RUNNABLE;
	104	}
	105
	106	// We want to lock the file while we run. We want to unblock
	107	// FINAL_BLOCKER when we are done.
	108
	109	class Relocate_task::Relocate_locker : public Task_locker
	110	{
	111	public:
	112	Relocate_locker(Task_token& token, Workqueue* workqueue,
	113	Object* object)
	114	: blocker_(token, workqueue), objlock_(*object)
	115	{ }
	116
	117	private:
	118	Task_locker_block blocker_;
	119	Task_locker_obj<Object> objlock_;
	120	};
	121
	122	Task_locker*
	123	Relocate_task::locks(Workqueue* workqueue)
	124	{
	125	return new Relocate_locker(*this->final_blocker_, workqueue,
	126	this->object_);
	127	}
	128
	129	// Run the task.
	130
	131	void
	132	Relocate_task::run(Workqueue*)
	133	{
92e059d8	134	this->object_->relocate(this->options_, this->symtab_, this->layout_,
61ba1cf9 ILT	135	this->of_);
	136	}
	137
92e059d8 ILT	138	// Read the relocs and local symbols from the object file and store
	139	// the information in RD.
	140
	141	template<int size, bool big_endian>
	142	void
f6ce93d6	143	Sized_relobj<size, big_endian>::do_read_relocs(Read_relocs_data* rd)
92e059d8 ILT	144	{
	145	rd->relocs.clear();
	146
	147	unsigned int shnum = this->shnum();
	148	if (shnum == 0)
	149	return;
	150
	151	rd->relocs.reserve(shnum / 2);
	152
	153	const unsigned char *pshdrs = this->get_view(this->shoff_,
	154	shnum * This::shdr_size);
	155	// Skip the first, dummy, section.
	156	const unsigned char *ps = pshdrs + This::shdr_size;
	157	for (unsigned int i = 1; i < shnum; ++i, ps += This::shdr_size)
	158	{
	159	typename This::Shdr shdr(ps);
	160
	161	unsigned int sh_type = shdr.get_sh_type();
	162	if (sh_type != elfcpp::SHT_REL && sh_type != elfcpp::SHT_RELA)
	163	continue;
	164
	165	unsigned int shndx = shdr.get_sh_info();
	166	if (shndx >= shnum)
	167	{
	168	fprintf(stderr, _("%s: %s: relocation section %u has bad info %u\n"),
	169	program_name, this->name().c_str(), i, shndx);
	170	gold_exit(false);
	171	}
	172
	173	if (!this->is_section_included(shndx))
	174	continue;
	175
ead1e424 ILT	176	// We are scanning relocations in order to fill out the GOT and
	177	// PLT sections. Relocations for sections which are not
	178	// allocated (typically debugging sections) should not add new
	179	// GOT and PLT entries. So we skip them.
	180	typename This::Shdr secshdr(pshdrs + shndx * This::shdr_size);
	181	if ((secshdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0)
	182	continue;
	183
92e059d8 ILT	184	if (shdr.get_sh_link() != this->symtab_shnum_)
	185	{
	186	fprintf(stderr,
	187	_("%s: %s: relocation section %u uses unexpected "
	188	"symbol table %u\n"),
	189	program_name, this->name().c_str(), i, shdr.get_sh_link());
	190	gold_exit(false);
	191	}
	192
	193	off_t sh_size = shdr.get_sh_size();
	194
	195	unsigned int reloc_size;
	196	if (sh_type == elfcpp::SHT_REL)
	197	reloc_size = elfcpp::Elf_sizes<size>::rel_size;
	198	else
	199	reloc_size = elfcpp::Elf_sizes<size>::rela_size;
	200	if (reloc_size != shdr.get_sh_entsize())
	201	{
	202	fprintf(stderr,
	203	_("%s: %s: unexpected entsize for reloc section %u: "
	204	"%lu != %u"),
	205	program_name, this->name().c_str(), i,
	206	static_cast<unsigned long>(shdr.get_sh_entsize()),
	207	reloc_size);
	208	gold_exit(false);
	209	}
	210
	211	size_t reloc_count = sh_size / reloc_size;
	212	if (reloc_count * reloc_size != sh_size)
	213	{
	214	fprintf(stderr, _("%s: %s: reloc section %u size %lu uneven"),
	215	program_name, this->name().c_str(), i,
	216	static_cast<unsigned long>(sh_size));
	217	gold_exit(false);
	218	}
	219
	220	rd->relocs.push_back(Section_relocs());
	221	Section_relocs& sr(rd->relocs.back());
	222	sr.reloc_shndx = i;
	223	sr.data_shndx = shndx;
	224	sr.contents = this->get_lasting_view(shdr.get_sh_offset(), sh_size);
	225	sr.sh_type = sh_type;
	226	sr.reloc_count = reloc_count;
	227	}
	228
	229	// Read the local symbols.
	230	if (this->symtab_shnum_ == 0 \|\| this->local_symbol_count_ == 0)
	231	rd->local_symbols = NULL;
	232	else
	233	{
	234	typename This::Shdr symtabshdr(pshdrs
	235	+ this->symtab_shnum_ * This::shdr_size);
	236	assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
	237	const int sym_size = This::sym_size;
	238	const unsigned int loccount = this->local_symbol_count_;
	239	assert(loccount == symtabshdr.get_sh_info());
	240	off_t locsize = loccount * sym_size;
	241	rd->local_symbols = this->get_lasting_view(symtabshdr.get_sh_offset(),
	242	locsize);
	243	}
	244	}
	245
	246	// Scan the relocs and adjust the symbol table. This looks for
	247	// relocations which require GOT/PLT/COPY relocations.
248
249	template<int size, bool big_endian>
250	void
f6ce93d6	251	Sized_relobj<size, big_endian>::do_scan_relocs(const General_options& options,
92e059d8	252	Symbol_table* symtab,
ead1e424	253	Layout* layout,
92e059d8 ILT	254	Read_relocs_data* rd)
	255	{
	256	Sized_target<size, big_endian>* target = this->sized_target();
	257
	258	const unsigned char* local_symbols;
	259	if (rd->local_symbols == NULL)
	260	local_symbols = NULL;
	261	else
	262	local_symbols = rd->local_symbols->data();
	263
	264	for (Read_relocs_data::Relocs_list::iterator p = rd->relocs.begin();
	265	p != rd->relocs.end();
	266	++p)
	267	{
ead1e424	268	target->scan_relocs(options, symtab, layout, this, p->sh_type,
92e059d8 ILT	269	p->contents->data(), p->reloc_count,
	270	this->local_symbol_count_,
	271	local_symbols,
	272	this->symbols_);
	273	delete p->contents;
	274	p->contents = NULL;
	275	}
	276
	277	if (rd->local_symbols != NULL)
	278	{
	279	delete rd->local_symbols;
	280	rd->local_symbols = NULL;
	281	}
	282	}
	283
61ba1cf9 ILT	284	// Relocate the input sections and write out the local symbols.
	285
	286	template<int size, bool big_endian>
	287	void
f6ce93d6	288	Sized_relobj<size, big_endian>::do_relocate(const General_options& options,
61ba1cf9	289	const Symbol_table* symtab,
92e059d8	290	const Layout* layout,
61ba1cf9 ILT	291	Output_file* of)
	292	{
	293	unsigned int shnum = this->shnum();
	294
	295	// Read the section headers.
	296	const unsigned char* pshdrs = this->get_view(this->shoff_,
	297	shnum * This::shdr_size);
	298
	299	Views views;
	300	views.resize(shnum);
	301
	302	// Make two passes over the sections. The first one copies the
	303	// section data to the output file. The second one applies
	304	// relocations.
	305
	306	this->write_sections(pshdrs, of, &views);
	307
	308	// Apply relocations.
	309
92e059d8	310	this->relocate_sections(options, symtab, layout, pshdrs, &views);
61ba1cf9 ILT	311
	312	// Write out the accumulated views.
	313	for (unsigned int i = 1; i < shnum; ++i)
	314	{
	315	if (views[i].view != NULL)
	316	of->write_output_view(views[i].offset, views[i].view_size,
	317	views[i].view);
	318	}
	319
	320	// Write out the local symbols.
92e059d8	321	this->write_local_symbols(of, layout->sympool());
61ba1cf9 ILT	322	}
	323
	324	// Write section data to the output file. PSHDRS points to the
	325	// section headers. Record the views in *PVIEWS for use when
	326	// relocating.
	327
	328	template<int size, bool big_endian>
	329	void
f6ce93d6	330	Sized_relobj<size, big_endian>::write_sections(const unsigned char* pshdrs,
61ba1cf9 ILT	331	Output_file* of,
	332	Views* pviews)
	333	{
	334	unsigned int shnum = this->shnum();
	335	std::vector<Map_to_output>& map_sections(this->map_to_output());
	336
	337	const unsigned char* p = pshdrs + This::shdr_size;
	338	for (unsigned int i = 1; i < shnum; ++i, p += This::shdr_size)
	339	{
	340	View_size* pvs = &(*pviews)[i];
	341
	342	pvs->view = NULL;
	343
	344	const Output_section* os = map_sections[i].output_section;
	345	if (os == NULL)
	346	continue;
	347
	348	typename This::Shdr shdr(p);
	349
	350	if (shdr.get_sh_type() == elfcpp::SHT_NOBITS)
	351	continue;
	352
61ba1cf9 ILT	353	off_t start = os->offset() + map_sections[i].offset;
	354	off_t sh_size = shdr.get_sh_size();
	355
ead1e424 ILT	356	if (sh_size == 0)
	357	continue;
	358
	359	assert(map_sections[i].offset >= 0
	360	&& map_sections[i].offset + sh_size <= os->data_size());
	361
61ba1cf9	362	unsigned char* view = of->get_output_view(start, sh_size);
92e059d8 ILT	363	this->read(shdr.get_sh_offset(), sh_size, view);
92e059d8 ILT	364
61ba1cf9 ILT	365	pvs->view = view;
	366	pvs->address = os->address() + map_sections[i].offset;
	367	pvs->offset = start;
	368	pvs->view_size = sh_size;
	369	}
	370	}
	371
	372	// Relocate section data. VIEWS points to the section data as views
	373	// in the output file.
	374
	375	template<int size, bool big_endian>
	376	void
f6ce93d6	377	Sized_relobj<size, big_endian>::relocate_sections(
92e059d8 ILT	378	const General_options& options,
	379	const Symbol_table* symtab,
	380	const Layout* layout,
	381	const unsigned char* pshdrs,
	382	Views* pviews)
61ba1cf9 ILT	383	{
61ba1cf9 ILT	384	unsigned int shnum = this->shnum();
61ba1cf9 ILT	385	Sized_target<size, big_endian>* target = this->sized_target();
61ba1cf9 ILT	386
92e059d8 ILT	387	Relocate_info<size, big_endian> relinfo;
	388	relinfo.options = &options;
	389	relinfo.symtab = symtab;
	390	relinfo.layout = layout;
	391	relinfo.object = this;
	392	relinfo.local_symbol_count = this->local_symbol_count_;
	393	relinfo.values = this->values_;
	394	relinfo.symbols = this->symbols_;
	395
61ba1cf9 ILT	396	const unsigned char* p = pshdrs + This::shdr_size;
	397	for (unsigned int i = 1; i < shnum; ++i, p += This::shdr_size)
	398	{
	399	typename This::Shdr shdr(p);
	400
	401	unsigned int sh_type = shdr.get_sh_type();
	402	if (sh_type != elfcpp::SHT_REL && sh_type != elfcpp::SHT_RELA)
	403	continue;
	404
	405	unsigned int index = shdr.get_sh_info();
	406	if (index >= this->shnum())
	407	{
	408	fprintf(stderr, _("%s: %s: relocation section %u has bad info %u\n"),
	409	program_name, this->name().c_str(), i, index);
	410	gold_exit(false);
	411	}
	412
92e059d8	413	if (!this->is_section_included(index))
61ba1cf9 ILT	414	{
	415	// This relocation section is against a section which we
	416	// discarded.
	417	continue;
	418	}
	419
	420	assert((*pviews)[index].view != NULL);
	421
	422	if (shdr.get_sh_link() != this->symtab_shnum_)
	423	{
	424	fprintf(stderr,
	425	_("%s: %s: relocation section %u uses unexpected "
	426	"symbol table %u\n"),
	427	program_name, this->name().c_str(), i, shdr.get_sh_link());
	428	gold_exit(false);
	429	}
	430
	431	off_t sh_size = shdr.get_sh_size();
	432	const unsigned char* prelocs = this->get_view(shdr.get_sh_offset(),
	433	sh_size);
	434
	435	unsigned int reloc_size;
	436	if (sh_type == elfcpp::SHT_REL)
	437	reloc_size = elfcpp::Elf_sizes<size>::rel_size;
	438	else
	439	reloc_size = elfcpp::Elf_sizes<size>::rela_size;
	440
	441	if (reloc_size != shdr.get_sh_entsize())
	442	{
	443	fprintf(stderr,
	444	_("%s: %s: unexpected entsize for reloc section %u: "
	445	"%lu != %u"),
	446	program_name, this->name().c_str(), i,
	447	static_cast<unsigned long>(shdr.get_sh_entsize()),
	448	reloc_size);
	449	gold_exit(false);
	450	}
	451
	452	size_t reloc_count = sh_size / reloc_size;
	453	if (reloc_count * reloc_size != sh_size)
	454	{
	455	fprintf(stderr, _("%s: %s: reloc section %u size %lu uneven"),
	456	program_name, this->name().c_str(), i,
	457	static_cast<unsigned long>(sh_size));
	458	gold_exit(false);
	459	}
	460
92e059d8 ILT	461	relinfo.reloc_shndx = i;
	462	relinfo.data_shndx = index;
	463	target->relocate_section(&relinfo,
	464	sh_type,
	465	prelocs,
	466	reloc_count,
61ba1cf9 ILT	467	(*pviews)[index].view,
	468	(*pviews)[index].address,
	469	(*pviews)[index].view_size);
	470	}
	471	}
	472
	473	// Instantiate the templates we need. We could use the configure
	474	// script to restrict this to only the ones for implemented targets.
	475
92e059d8 ILT	476	template
92e059d8 ILT	477	void
f6ce93d6	478	Sized_relobj<32, false>::do_read_relocs(Read_relocs_data* rd);
92e059d8 ILT	479
	480	template
	481	void
f6ce93d6	482	Sized_relobj<32, true>::do_read_relocs(Read_relocs_data* rd);
92e059d8 ILT	483
	484	template
	485	void
f6ce93d6	486	Sized_relobj<64, false>::do_read_relocs(Read_relocs_data* rd);
92e059d8 ILT	487
	488	template
	489	void
f6ce93d6	490	Sized_relobj<64, true>::do_read_relocs(Read_relocs_data* rd);
92e059d8 ILT	491
	492	template
	493	void
f6ce93d6	494	Sized_relobj<32, false>::do_scan_relocs(const General_options& options,
92e059d8	495	Symbol_table* symtab,
ead1e424	496	Layout* layout,
92e059d8 ILT	497	Read_relocs_data* rd);
	498
	499	template
	500	void
f6ce93d6	501	Sized_relobj<32, true>::do_scan_relocs(const General_options& options,
92e059d8	502	Symbol_table* symtab,
ead1e424	503	Layout* layout,
92e059d8 ILT	504	Read_relocs_data* rd);
	505
	506	template
	507	void
f6ce93d6	508	Sized_relobj<64, false>::do_scan_relocs(const General_options& options,
92e059d8	509	Symbol_table* symtab,
ead1e424	510	Layout* layout,
92e059d8 ILT	511	Read_relocs_data* rd);
	512
	513	template
	514	void
f6ce93d6	515	Sized_relobj<64, true>::do_scan_relocs(const General_options& options,
92e059d8	516	Symbol_table* symtab,
ead1e424	517	Layout* layout,
92e059d8 ILT	518	Read_relocs_data* rd);
92e059d8 ILT	519
61ba1cf9 ILT	520	template
61ba1cf9 ILT	521	void
f6ce93d6	522	Sized_relobj<32, false>::do_relocate(const General_options& options,
61ba1cf9	523	const Symbol_table* symtab,
92e059d8	524	const Layout* layout,
61ba1cf9 ILT	525	Output_file* of);
	526
	527	template
	528	void
f6ce93d6	529	Sized_relobj<32, true>::do_relocate(const General_options& options,
61ba1cf9	530	const Symbol_table* symtab,
92e059d8	531	const Layout* layout,
61ba1cf9 ILT	532	Output_file* of);
	533
	534	template
	535	void
f6ce93d6	536	Sized_relobj<64, false>::do_relocate(const General_options& options,
61ba1cf9	537	const Symbol_table* symtab,
92e059d8	538	const Layout* layout,
61ba1cf9 ILT	539	Output_file* of);
	540
	541	template
	542	void
f6ce93d6	543	Sized_relobj<64, true>::do_relocate(const General_options& options,
61ba1cf9	544	const Symbol_table* symtab,
92e059d8	545	const Layout* layout,
61ba1cf9 ILT	546	Output_file* of);
	547
	548
	549	} // End namespace gold.