bfd/simple.c - binutils-gdb - Git at Google

 /* simple.c -- BFD simple client routines
    Copyright 2002, 2003, 2004
    Free Software Foundation, Inc.
    Contributed by MontaVista Software, Inc.

    This file is part of BFD, the Binary File Descriptor library.

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

 #include "bfd.h"
 #include "sysdep.h"
 #include "libbfd.h"
 #include "bfdlink.h"

 static bfd_boolean
 simple_dummy_warning (struct bfd_link_info *link_info ATTRIBUTE_UNUSED,
 		      const char *warning ATTRIBUTE_UNUSED,
 		      const char *symbol ATTRIBUTE_UNUSED,
 		      bfd *abfd ATTRIBUTE_UNUSED,
 		      asection *section ATTRIBUTE_UNUSED,
 		      bfd_vma address ATTRIBUTE_UNUSED)
 {
   return TRUE;
 }

 static bfd_boolean
 simple_dummy_undefined_symbol (struct bfd_link_info *link_info ATTRIBUTE_UNUSED,
 			       const char *name ATTRIBUTE_UNUSED,
 			       bfd *abfd ATTRIBUTE_UNUSED,
 			       asection *section ATTRIBUTE_UNUSED,
 			       bfd_vma address ATTRIBUTE_UNUSED,
 			       bfd_boolean fatal ATTRIBUTE_UNUSED)
 {
   return TRUE;
 }

 static bfd_boolean
 simple_dummy_reloc_overflow (struct bfd_link_info *link_info ATTRIBUTE_UNUSED,
 			     const char *name ATTRIBUTE_UNUSED,
 			     const char *reloc_name ATTRIBUTE_UNUSED,
 			     bfd_vma addend ATTRIBUTE_UNUSED,
 			     bfd *abfd ATTRIBUTE_UNUSED,
 			     asection *section ATTRIBUTE_UNUSED,
 			     bfd_vma address ATTRIBUTE_UNUSED)
 {
   return TRUE;
 }

 static bfd_boolean
 simple_dummy_reloc_dangerous (struct bfd_link_info *link_info ATTRIBUTE_UNUSED,
 			      const char *message ATTRIBUTE_UNUSED,
 			      bfd *abfd ATTRIBUTE_UNUSED,
 			      asection *section ATTRIBUTE_UNUSED,
 			      bfd_vma address ATTRIBUTE_UNUSED)
 {
   return TRUE;
 }

 static bfd_boolean
 simple_dummy_unattached_reloc (struct bfd_link_info *link_info ATTRIBUTE_UNUSED,
 			       const char *name ATTRIBUTE_UNUSED,
 			       bfd *abfd ATTRIBUTE_UNUSED,
 			       asection *section ATTRIBUTE_UNUSED,
 			       bfd_vma address ATTRIBUTE_UNUSED)
 {
   return TRUE;
 }

 struct saved_output_info
 {
   bfd_vma offset;
   asection *section;
 };

 static void
 simple_save_output_info (bfd *abfd ATTRIBUTE_UNUSED,
 			 asection *section,
 			 void *ptr)
 {
   struct saved_output_info *output_info = ptr;
   output_info[section->index].offset = section->output_offset;
   output_info[section->index].section = section->output_section;
   section->output_offset = 0;
   section->output_section = section;
 }

 static void
 simple_restore_output_info (bfd *abfd ATTRIBUTE_UNUSED,
 			    asection *section,
 			    void *ptr)
 {
   struct saved_output_info *output_info = ptr;
   section->output_offset = output_info[section->index].offset;
   section->output_section = output_info[section->index].section;
 }

 /*
 FUNCTION
 	bfd_simple_relocate_secton

 SYNOPSIS
 	bfd_byte *bfd_simple_get_relocated_section_contents
 	  (bfd *abfd, asection *sec, bfd_byte *outbuf, asymbol **symbol_table);

 DESCRIPTION
 	Returns the relocated contents of section @var{sec}.  The symbols in
 	@var{symbol_table} will be used, or the symbols from @var{abfd} if
 	@var{symbol_table} is NULL.  The output offsets for all sections will
 	be temporarily reset to 0.  The result will be stored at @var{outbuf}
 	or allocated with @code{bfd_malloc} if @var{outbuf} is @code{NULL}.

 	Generally all sections in @var{abfd} should have their
 	@code{output_section} pointing back to the original section.

 	Returns @code{NULL} on a fatal error; ignores errors applying
 	particular relocations.
 */

 bfd_byte *
 bfd_simple_get_relocated_section_contents (bfd *abfd,
 					   asection *sec,
 					   bfd_byte *outbuf,
 					   asymbol **symbol_table)
 {
   struct bfd_link_info link_info;
   struct bfd_link_order link_order;
   struct bfd_link_callbacks callbacks;
   bfd_byte *contents, *data;
   int storage_needed;
   void *saved_offsets;
   bfd_size_type old_cooked_size;

   if (! (sec->flags & SEC_RELOC))
     {
       bfd_size_type size = bfd_section_size (abfd, sec);

       if (outbuf == NULL)
 	contents = bfd_malloc (size);
       else
 	contents = outbuf;

       if (contents)
 	bfd_get_section_contents (abfd, sec, contents, 0, size);

       return contents;
     }

   /* In order to use bfd_get_relocated_section_contents, we need
      to forge some data structures that it expects.  */

   /* Fill in the bare minimum number of fields for our purposes.  */
   memset (&link_info, 0, sizeof (link_info));
   link_info.input_bfds = abfd;

   link_info.hash = _bfd_generic_link_hash_table_create (abfd);
   link_info.callbacks = &callbacks;
   callbacks.warning = simple_dummy_warning;
   callbacks.undefined_symbol = simple_dummy_undefined_symbol;
   callbacks.reloc_overflow = simple_dummy_reloc_overflow;
   callbacks.reloc_dangerous = simple_dummy_reloc_dangerous;
   callbacks.unattached_reloc = simple_dummy_unattached_reloc;

   memset (&link_order, 0, sizeof (link_order));
   link_order.next = NULL;
   link_order.type = bfd_indirect_link_order;
   link_order.offset = 0;
   link_order.size = bfd_section_size (abfd, sec);
   link_order.u.indirect.section = sec;

   data = NULL;
   if (outbuf == NULL)
     {
       data = bfd_malloc (bfd_section_size (abfd, sec));
       if (data == NULL)
 	return NULL;
       outbuf = data;
     }

   /* The sections in ABFD may already have output sections and offsets set.
      Because this function is primarily for debug sections, and GCC uses the
      knowledge that debug sections will generally have VMA 0 when emitting
      relocations between DWARF-2 sections (which are supposed to be
      section-relative offsets anyway), we need to reset the output offsets
      to zero.  We also need to arrange for section->output_section->vma plus
      section->output_offset to equal section->vma, which we do by setting
      section->output_section to point back to section.  Save the original
      output offset and output section to restore later.  */
   saved_offsets = malloc (sizeof (struct saved_output_info)
 			  * abfd->section_count);
   if (saved_offsets == NULL)
     {
       if (data)
 	free (data);
       return NULL;
     }
   bfd_map_over_sections (abfd, simple_save_output_info, saved_offsets);

   if (symbol_table == NULL)
     {
       _bfd_generic_link_add_symbols (abfd, &link_info);

       storage_needed = bfd_get_symtab_upper_bound (abfd);
       symbol_table = bfd_malloc (storage_needed);
       bfd_canonicalize_symtab (abfd, symbol_table);
     }
   else
     storage_needed = 0;

   /* This function might be called before _cooked_size has been set, and
      bfd_perform_relocation needs _cooked_size to be valid.  */
   old_cooked_size = sec->_cooked_size;
   if (old_cooked_size == 0)
     sec->_cooked_size = sec->_raw_size;

   contents = bfd_get_relocated_section_contents (abfd,
 						 &link_info,
 						 &link_order,
 						 outbuf,
 						 0,
 						 symbol_table);
   if (contents == NULL && data != NULL)
     free (data);

 #if 0
   /* NOTE: cagney/2003-04-05: This free, which was introduced on
      2003-03-31 to stop a memory leak, caused a memory corruption
      between GDB and BFD.  The problem, which is stabs specific, can
      be identified by a bunch of failures in relocate.exp vis:

        gdb.base/relocate.exp: get address of static_bar

      Details of the problem can be found on the binutils@ mailing
      list, see the discussion thread: "gdb.mi/mi-cli.exp failures".  */
   if (storage_needed != 0)
     free (symbol_table);
 #endif

   sec->_cooked_size = old_cooked_size;
   bfd_map_over_sections (abfd, simple_restore_output_info, saved_offsets);
   free (saved_offsets);

   _bfd_generic_link_hash_table_free (link_info.hash);

   return contents;
 }
	/* simple.c -- BFD simple client routines
	Copyright 2002, 2003, 2004
	Free Software Foundation, Inc.
	Contributed by MontaVista Software, Inc.

	This file is part of BFD, the Binary File Descriptor library.

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */

	#include "bfd.h"
	#include "sysdep.h"
	#include "libbfd.h"
	#include "bfdlink.h"

	static bfd_boolean
	simple_dummy_warning (struct bfd_link_info *link_info ATTRIBUTE_UNUSED,
	const char *warning ATTRIBUTE_UNUSED,
	const char *symbol ATTRIBUTE_UNUSED,
	bfd *abfd ATTRIBUTE_UNUSED,
	asection *section ATTRIBUTE_UNUSED,
	bfd_vma address ATTRIBUTE_UNUSED)
	{
	return TRUE;
	}

	static bfd_boolean
	simple_dummy_undefined_symbol (struct bfd_link_info *link_info ATTRIBUTE_UNUSED,
	const char *name ATTRIBUTE_UNUSED,
	bfd *abfd ATTRIBUTE_UNUSED,
	asection *section ATTRIBUTE_UNUSED,
	bfd_vma address ATTRIBUTE_UNUSED,
	bfd_boolean fatal ATTRIBUTE_UNUSED)
	{
	return TRUE;
	}

	static bfd_boolean
	simple_dummy_reloc_overflow (struct bfd_link_info *link_info ATTRIBUTE_UNUSED,
	const char *name ATTRIBUTE_UNUSED,
	const char *reloc_name ATTRIBUTE_UNUSED,
	bfd_vma addend ATTRIBUTE_UNUSED,
	bfd *abfd ATTRIBUTE_UNUSED,
	asection *section ATTRIBUTE_UNUSED,
	bfd_vma address ATTRIBUTE_UNUSED)
	{
	return TRUE;
	}

	static bfd_boolean
	simple_dummy_reloc_dangerous (struct bfd_link_info *link_info ATTRIBUTE_UNUSED,
	const char *message ATTRIBUTE_UNUSED,
	bfd *abfd ATTRIBUTE_UNUSED,
	asection *section ATTRIBUTE_UNUSED,
	bfd_vma address ATTRIBUTE_UNUSED)
	{
	return TRUE;
	}

	static bfd_boolean
	simple_dummy_unattached_reloc (struct bfd_link_info *link_info ATTRIBUTE_UNUSED,
	const char *name ATTRIBUTE_UNUSED,
	bfd *abfd ATTRIBUTE_UNUSED,
	asection *section ATTRIBUTE_UNUSED,
	bfd_vma address ATTRIBUTE_UNUSED)
	{
	return TRUE;
	}

	struct saved_output_info
	{
	bfd_vma offset;
	asection *section;
	};

	static void
	simple_save_output_info (bfd *abfd ATTRIBUTE_UNUSED,
	asection *section,
	void *ptr)
	{
	struct saved_output_info *output_info = ptr;
	output_info[section->index].offset = section->output_offset;
	output_info[section->index].section = section->output_section;
	section->output_offset = 0;
	section->output_section = section;
	}

	static void
	simple_restore_output_info (bfd *abfd ATTRIBUTE_UNUSED,
	asection *section,
	void *ptr)
	{
	struct saved_output_info *output_info = ptr;
	section->output_offset = output_info[section->index].offset;
	section->output_section = output_info[section->index].section;
	}

	/*
	FUNCTION
	bfd_simple_relocate_secton

	SYNOPSIS
	bfd_byte *bfd_simple_get_relocated_section_contents
	(bfd abfd, asection sec, bfd_byte outbuf, asymbol *symbol_table);

	DESCRIPTION
	Returns the relocated contents of section @var{sec}. The symbols in
	@var{symbol_table} will be used, or the symbols from @var{abfd} if
	@var{symbol_table} is NULL. The output offsets for all sections will
	be temporarily reset to 0. The result will be stored at @var{outbuf}
	or allocated with @code{bfd_malloc} if @var{outbuf} is @code{NULL}.

	Generally all sections in @var{abfd} should have their
	@code{output_section} pointing back to the original section.

	Returns @code{NULL} on a fatal error; ignores errors applying
	particular relocations.
	*/

	bfd_byte *
	bfd_simple_get_relocated_section_contents (bfd *abfd,
	asection *sec,
	bfd_byte *outbuf,
	asymbol **symbol_table)
	{
	struct bfd_link_info link_info;
	struct bfd_link_order link_order;
	struct bfd_link_callbacks callbacks;
	bfd_byte contents, data;
	int storage_needed;
	void *saved_offsets;
	bfd_size_type old_cooked_size;

	if (! (sec->flags & SEC_RELOC))
	{
	bfd_size_type size = bfd_section_size (abfd, sec);

	if (outbuf == NULL)
	contents = bfd_malloc (size);
	else
	contents = outbuf;

	if (contents)
	bfd_get_section_contents (abfd, sec, contents, 0, size);

	return contents;
	}

	/* In order to use bfd_get_relocated_section_contents, we need
	to forge some data structures that it expects. */

	/* Fill in the bare minimum number of fields for our purposes. */
	memset (&link_info, 0, sizeof (link_info));
	link_info.input_bfds = abfd;

	link_info.hash = _bfd_generic_link_hash_table_create (abfd);
	link_info.callbacks = &callbacks;
	callbacks.warning = simple_dummy_warning;
	callbacks.undefined_symbol = simple_dummy_undefined_symbol;
	callbacks.reloc_overflow = simple_dummy_reloc_overflow;
	callbacks.reloc_dangerous = simple_dummy_reloc_dangerous;
	callbacks.unattached_reloc = simple_dummy_unattached_reloc;

	memset (&link_order, 0, sizeof (link_order));
	link_order.next = NULL;
	link_order.type = bfd_indirect_link_order;
	link_order.offset = 0;
	link_order.size = bfd_section_size (abfd, sec);
	link_order.u.indirect.section = sec;

	data = NULL;
	if (outbuf == NULL)
	{
	data = bfd_malloc (bfd_section_size (abfd, sec));
	if (data == NULL)
	return NULL;
	outbuf = data;
	}

	/* The sections in ABFD may already have output sections and offsets set.
	Because this function is primarily for debug sections, and GCC uses the
	knowledge that debug sections will generally have VMA 0 when emitting
	relocations between DWARF-2 sections (which are supposed to be
	section-relative offsets anyway), we need to reset the output offsets
	to zero. We also need to arrange for section->output_section->vma plus
	section->output_offset to equal section->vma, which we do by setting
	section->output_section to point back to section. Save the original
	output offset and output section to restore later. */
	saved_offsets = malloc (sizeof (struct saved_output_info)
	* abfd->section_count);
	if (saved_offsets == NULL)
	{
	if (data)
	free (data);
	return NULL;
	}
	bfd_map_over_sections (abfd, simple_save_output_info, saved_offsets);

	if (symbol_table == NULL)
	{
	_bfd_generic_link_add_symbols (abfd, &link_info);

	storage_needed = bfd_get_symtab_upper_bound (abfd);
	symbol_table = bfd_malloc (storage_needed);
	bfd_canonicalize_symtab (abfd, symbol_table);
	}
	else
	storage_needed = 0;

	/* This function might be called before _cooked_size has been set, and
	bfd_perform_relocation needs _cooked_size to be valid. */
	old_cooked_size = sec->_cooked_size;
	if (old_cooked_size == 0)
	sec->_cooked_size = sec->_raw_size;

	contents = bfd_get_relocated_section_contents (abfd,
	&link_info,
	&link_order,
	outbuf,
	0,
	symbol_table);
	if (contents == NULL && data != NULL)
	free (data);

	#if 0
	/* NOTE: cagney/2003-04-05: This free, which was introduced on
	2003-03-31 to stop a memory leak, caused a memory corruption
	between GDB and BFD. The problem, which is stabs specific, can
	be identified by a bunch of failures in relocate.exp vis:

	gdb.base/relocate.exp: get address of static_bar

	Details of the problem can be found on the binutils@ mailing
	list, see the discussion thread: "gdb.mi/mi-cli.exp failures". */
	if (storage_needed != 0)
	free (symbol_table);
	#endif

	sec->_cooked_size = old_cooked_size;
	bfd_map_over_sections (abfd, simple_restore_output_info, saved_offsets);
	free (saved_offsets);

	_bfd_generic_link_hash_table_free (link_info.hash);

	return contents;
	}