[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->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*)
{
  return this->symtab_lock_->is_writable() ? IS_RUNNABLE : IS_LOCKED;
}

// 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->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_object<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;

      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_object<size, big_endian>::do_scan_relocs(const General_options& options,
					       Symbol_table* symtab,
					       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, 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_object<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_object<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;

      assert(map_sections[i].offset >= 0
	     && map_sections[i].offset < os->data_size());
      off_t start = os->offset() + map_sections[i].offset;
      off_t sh_size = shdr.get_sh_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_object<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_object<32, false>::do_read_relocs(Read_relocs_data* rd);

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

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

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

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

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

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

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

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

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

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

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