ld/ldelfgen.c

/* Emulation code used by all ELF targets.
   Copyright (C) 1991-2019 Free Software Foundation, Inc.

   This file is part of the GNU Binutils.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

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

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
   MA 02110-1301, USA.  */

#include "sysdep.h"
#include "bfd.h"
#include "bfdlink.h"
#include "ld.h"
#include "ldmain.h"
#include "ldmisc.h"
#include "ldexp.h"
#include "ldlang.h"
#include "elf-bfd.h"
#include "ldelfgen.h"

void
ldelf_map_segments (bfd_boolean need_layout)
{
  int tries = 10;

  do
    {
      lang_relax_sections (need_layout);
      need_layout = FALSE;

      if (link_info.output_bfd->xvec->flavour == bfd_target_elf_flavour
	  && !bfd_link_relocatable (&link_info))
	{
	  bfd_size_type phdr_size;

	  phdr_size = elf_program_header_size (link_info.output_bfd);
	  /* If we don't have user supplied phdrs, throw away any
	     previous linker generated program headers.  */
	  if (lang_phdr_list == NULL)
	    elf_seg_map (link_info.output_bfd) = NULL;
	  if (!_bfd_elf_map_sections_to_segments (link_info.output_bfd,
						  &link_info))
	    einfo (_("%F%P: map sections to segments failed: %E\n"));

	  if (phdr_size != elf_program_header_size (link_info.output_bfd))
	    {
	      if (tries > 6)
		/* The first few times we allow any change to
		   phdr_size .  */
		need_layout = TRUE;
	      else if (phdr_size
		       < elf_program_header_size (link_info.output_bfd))
		/* After that we only allow the size to grow.  */
		need_layout = TRUE;
	      else
		elf_program_header_size (link_info.output_bfd) = phdr_size;
	    }
	}
    }
  while (need_layout && --tries);

  if (tries == 0)
    einfo (_("%F%P: looping in map_segments"));
}