ELF/BFD: Limit `_bfd_elf_link_renumber_dynsyms' call in section GC

[deliverable/binutils-gdb.git] / bfd / aout-adobe.c

/* BFD back-end for a.out.adobe binaries.
   Copyright (C) 1990-2017 Free Software Foundation, Inc.
   Written by Cygnus Support.  Based on bout.c.

   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 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 "libbfd.h"
#include "aout/adobe.h"
#include "aout/stab_gnu.h"
#include "libaout.h"		/* BFD a.out internal data structures.  */

/* Forward decl.  */
extern const bfd_target aout_adobe_vec;

/* Swaps the information in an executable header taken from a raw byte
   stream memory image, into the internal exec_header structure.  */

static void
aout_adobe_swap_exec_header_in (bfd *abfd,
				struct external_exec *bytes,
				struct internal_exec *execp)
{
  /* Now fill in fields in the execp, from the bytes in the raw data.  */
  execp->a_info   = H_GET_32 (abfd, bytes->e_info);
  execp->a_text   = GET_WORD (abfd, bytes->e_text);
  execp->a_data   = GET_WORD (abfd, bytes->e_data);
  execp->a_bss    = GET_WORD (abfd, bytes->e_bss);
  execp->a_syms   = GET_WORD (abfd, bytes->e_syms);
  execp->a_entry  = GET_WORD (abfd, bytes->e_entry);
  execp->a_trsize = GET_WORD (abfd, bytes->e_trsize);
  execp->a_drsize = GET_WORD (abfd, bytes->e_drsize);
}

/* Swaps the information in an internal exec header structure into the
   supplied buffer ready for writing to disk.  */

static void
aout_adobe_swap_exec_header_out (bfd *abfd,
				 struct internal_exec *execp,
				 struct external_exec *bytes)
{
  /* Now fill in fields in the raw data, from the fields in the exec
     struct.  */
  H_PUT_32 (abfd, execp->a_info  , bytes->e_info);
  PUT_WORD (abfd, execp->a_text  , bytes->e_text);
  PUT_WORD (abfd, execp->a_data  , bytes->e_data);
  PUT_WORD (abfd, execp->a_bss   , bytes->e_bss);
  PUT_WORD (abfd, execp->a_syms  , bytes->e_syms);
  PUT_WORD (abfd, execp->a_entry , bytes->e_entry);
  PUT_WORD (abfd, execp->a_trsize, bytes->e_trsize);
  PUT_WORD (abfd, execp->a_drsize, bytes->e_drsize);
}

/* Finish up the opening of a b.out file for reading.  Fill in all the
   fields that are not handled by common code.  */

static const bfd_target *
aout_adobe_callback (bfd *abfd)
{
  struct internal_exec *execp = exec_hdr (abfd);
  asection *sect;
  struct external_segdesc ext[1];
  char *section_name;
  char try_again[30];	/* Name and number.  */
  char *newname;
  int trynum;
  flagword flags;

  /* Architecture and machine type -- unknown in this format.  */
  bfd_set_arch_mach (abfd, bfd_arch_unknown, 0L);

  /* The positions of the string table and symbol table.  */
  obj_str_filepos (abfd) = N_STROFF (execp);
  obj_sym_filepos (abfd) = N_SYMOFF (execp);

  /* Suck up the section information from the file, one section at a time.  */
  for (;;)
    {
      bfd_size_type amt = sizeof (*ext);
      if (bfd_bread ( ext, amt, abfd) != amt)
	{
	  if (bfd_get_error () != bfd_error_system_call)
	    bfd_set_error (bfd_error_wrong_format);

	  return NULL;
	}
      switch (ext->e_type[0])
	{
	case N_TEXT:
	  section_name = ".text";
	  flags = SEC_CODE | SEC_LOAD | SEC_ALLOC | SEC_HAS_CONTENTS;
	  break;

	case N_DATA:
	  section_name = ".data";
	  flags = SEC_DATA | SEC_LOAD | SEC_ALLOC | SEC_HAS_CONTENTS;
	  break;

	case N_BSS:
	  section_name = ".bss";
	  flags = SEC_DATA | SEC_HAS_CONTENTS;
	  break;

	case 0:
	  goto no_more_sections;

	default:
	  _bfd_error_handler
	    /* xgettext:c-format */
	    (_("%B: Unknown section type in a.out.adobe file: %x\n"),
	     abfd, ext->e_type[0]);
	  goto no_more_sections;
	}

      /* First one is called ".text" or whatever; subsequent ones are
	 ".text1", ".text2", ...  */
      bfd_set_error (bfd_error_no_error);
      sect = bfd_make_section_with_flags (abfd, section_name, flags);
      trynum = 0;

      while (!sect)
	{
	  if (bfd_get_error () != bfd_error_no_error)
	    /* Some other error -- slide into the sunset.  */
	    return NULL;
	  sprintf (try_again, "%s%d", section_name, ++trynum);
	  sect = bfd_make_section_with_flags (abfd, try_again, flags);
	}

      /* Fix the name, if it is a sprintf'd name.  */
      if (sect->name == try_again)
	{
	  amt = strlen (sect->name);
	  newname = bfd_zalloc (abfd, amt);
	  if (newname == NULL)
	    return NULL;
	  strcpy (newname, sect->name);
	  sect->name = newname;
	}

      /* Assumed big-endian.  */
      sect->size = ((ext->e_size[0] << 8)
		    | ext->e_size[1] << 8
		    | ext->e_size[2]);
      sect->vma = H_GET_32 (abfd, ext->e_virtbase);
      sect->filepos = H_GET_32 (abfd, ext->e_filebase);
      /* FIXME XXX alignment?  */

      /* Set relocation information for first section of each type.  */
      if (trynum == 0)
	switch (ext->e_type[0])
	  {
	  case N_TEXT:
	    sect->rel_filepos = N_TRELOFF (execp);
	    sect->reloc_count = execp->a_trsize;
	    break;

	  case N_DATA:
	    sect->rel_filepos = N_DRELOFF (execp);
	    sect->reloc_count = execp->a_drsize;
	    break;

	  default:
	    break;
	  }
    }
 no_more_sections:

  adata (abfd).reloc_entry_size = sizeof (struct reloc_std_external);
  adata (abfd).symbol_entry_size = sizeof (struct external_nlist);
  adata (abfd).page_size = 1; /* Not applicable.  */
  adata (abfd).segment_size = 1; /* Not applicable.  */
  adata (abfd).exec_bytes_size = EXEC_BYTES_SIZE;

  return abfd->xvec;
}

static const bfd_target *
aout_adobe_object_p (bfd *abfd)
{
  struct internal_exec anexec;
  struct external_exec exec_bytes;
  char *targ;
  bfd_size_type amt = EXEC_BYTES_SIZE;

  if (bfd_bread (& exec_bytes, amt, abfd) != amt)
    {
      if (bfd_get_error () != bfd_error_system_call)
	bfd_set_error (bfd_error_wrong_format);
      return NULL;
    }

  anexec.a_info = H_GET_32 (abfd, exec_bytes.e_info);

  /* Normally we just compare for the magic number.
     However, a bunch of Adobe tools aren't fixed up yet; they generate
     files using ZMAGIC(!).
     If the environment variable GNUTARGET is set to "a.out.adobe", we will
     take just about any a.out file as an Adobe a.out file.  FIXME!  */

  if (N_BADMAG (&anexec))
    {
      targ = getenv ("GNUTARGET");
      if (targ && !strcmp (targ, aout_adobe_vec.name))
	/* Just continue anyway, if specifically set to this format.  */
	;
      else
	{
	  bfd_set_error (bfd_error_wrong_format);
	  return NULL;
	}
    }

  aout_adobe_swap_exec_header_in (abfd, &exec_bytes, &anexec);
  return aout_32_some_aout_object_p (abfd, &anexec, aout_adobe_callback);
}

struct bout_data_struct
{
  struct aoutdata a;
  struct internal_exec e;
};

static bfd_boolean
aout_adobe_mkobject (bfd *abfd)
{
  struct bout_data_struct *rawptr;
  bfd_size_type amt = sizeof (struct bout_data_struct);

  rawptr = bfd_zalloc (abfd, amt);
  if (rawptr == NULL)
    return FALSE;

  abfd->tdata.bout_data = rawptr;
  exec_hdr (abfd) = &rawptr->e;

  adata (abfd).reloc_entry_size = sizeof (struct reloc_std_external);
  adata (abfd).symbol_entry_size = sizeof (struct external_nlist);
  adata (abfd).page_size = 1; /* Not applicable.  */
  adata (abfd).segment_size = 1; /* Not applicable.  */
  adata (abfd).exec_bytes_size = EXEC_BYTES_SIZE;

  return TRUE;
}

static void
aout_adobe_write_section (bfd *abfd ATTRIBUTE_UNUSED,
			  sec_ptr sect ATTRIBUTE_UNUSED)
{
  /* FIXME XXX.  */
}

static bfd_boolean
aout_adobe_write_object_contents (bfd *abfd)
{
  struct external_exec swapped_hdr;
  static struct external_segdesc sentinel[1];	/* Initialized to zero.  */
  asection *sect;
  bfd_size_type amt;

  exec_hdr (abfd)->a_info = ZMAGIC;

  /* Calculate text size as total of text sections, etc.  */
  exec_hdr (abfd)->a_text = 0;
  exec_hdr (abfd)->a_data = 0;
  exec_hdr (abfd)->a_bss  = 0;
  exec_hdr (abfd)->a_trsize = 0;
  exec_hdr (abfd)->a_drsize = 0;

  for (sect = abfd->sections; sect; sect = sect->next)
    {
      if (sect->flags & SEC_CODE)
	{
	  exec_hdr (abfd)->a_text += sect->size;
	  exec_hdr (abfd)->a_trsize += sect->reloc_count *
	    sizeof (struct reloc_std_external);
	}
      else if (sect->flags & SEC_DATA)
	{
	  exec_hdr (abfd)->a_data += sect->size;
	  exec_hdr (abfd)->a_drsize += sect->reloc_count *
	    sizeof (struct reloc_std_external);
	}
      else if (sect->flags & SEC_ALLOC && !(sect->flags & SEC_LOAD))
	exec_hdr (abfd)->a_bss += sect->size;
    }

  exec_hdr (abfd)->a_syms = bfd_get_symcount (abfd)
    * sizeof (struct external_nlist);
  exec_hdr (abfd)->a_entry = bfd_get_start_address (abfd);

  aout_adobe_swap_exec_header_out (abfd, exec_hdr (abfd), &swapped_hdr);

  amt = EXEC_BYTES_SIZE;
  if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0
      || bfd_bwrite (& swapped_hdr, amt, abfd) != amt)
    return FALSE;

  /* Now write out the section information.  Text first, data next, rest
     afterward.  */
  for (sect = abfd->sections; sect; sect = sect->next)
    if (sect->flags & SEC_CODE)
      aout_adobe_write_section (abfd, sect);

  for (sect = abfd->sections; sect; sect = sect->next)
    if (sect->flags & SEC_DATA)
      aout_adobe_write_section (abfd, sect);

  for (sect = abfd->sections; sect; sect = sect->next)
    if (!(sect->flags & (SEC_CODE | SEC_DATA)))
      aout_adobe_write_section (abfd, sect);

  /* Write final `sentinel` section header (with type of 0).  */
  amt = sizeof (*sentinel);
  if (bfd_bwrite (sentinel, amt, abfd) != amt)
    return FALSE;

  /* Now write out reloc info, followed by syms and strings.  */
  if (bfd_get_symcount (abfd) != 0)
    {
      if (bfd_seek (abfd, (file_ptr) (N_SYMOFF (exec_hdr (abfd))), SEEK_SET)
	  != 0)
	return FALSE;

      if (! aout_32_write_syms (abfd))
	return FALSE;

      if (bfd_seek (abfd, (file_ptr) (N_TRELOFF (exec_hdr (abfd))), SEEK_SET)
	  != 0)
	return FALSE;

      for (sect = abfd->sections; sect; sect = sect->next)
	if (sect->flags & SEC_CODE)
	  if (!aout_32_squirt_out_relocs (abfd, sect))
	    return FALSE;

      if (bfd_seek (abfd, (file_ptr) (N_DRELOFF (exec_hdr (abfd))), SEEK_SET)
	  != 0)
	return FALSE;

      for (sect = abfd->sections; sect; sect = sect->next)
	if (sect->flags & SEC_DATA)
	  if (!aout_32_squirt_out_relocs (abfd, sect))
	    return FALSE;
    }

  return TRUE;
}
\f
static bfd_boolean
aout_adobe_set_section_contents (bfd *abfd,
				 asection *section,
				 const void * location,
				 file_ptr offset,
				 bfd_size_type count)
{
  file_ptr section_start;
  sec_ptr sect;

  /* Set by bfd.c handler.  */
  if (! abfd->output_has_begun)
    {
      /* Assign file offsets to sections.  Text sections are first, and
	 are contiguous.  Then data sections.  Everything else at the end.  */
      section_start = N_TXTOFF (0);

      for (sect = abfd->sections; sect; sect = sect->next)
	{
	  if (sect->flags & SEC_CODE)
	    {
	      sect->filepos = section_start;
	      /* FIXME:  Round to alignment.  */
	      section_start += sect->size;
	    }
	}

      for (sect = abfd->sections; sect; sect = sect->next)
	{
	  if (sect->flags & SEC_DATA)
	    {
	      sect->filepos = section_start;
	      /* FIXME:  Round to alignment.  */
	      section_start += sect->size;
	    }
	}

      for (sect = abfd->sections; sect; sect = sect->next)
	{
	  if (sect->flags & SEC_HAS_CONTENTS &&
	      !(sect->flags & (SEC_CODE | SEC_DATA)))
	    {
	      sect->filepos = section_start;
	      /* FIXME:  Round to alignment.  */
	      section_start += sect->size;
	    }
	}
    }

  /* Regardless, once we know what we're doing, we might as well get
     going.  */
  if (bfd_seek (abfd, section->filepos + offset, SEEK_SET) != 0)
    return FALSE;

  if (count == 0)
    return TRUE;

  return bfd_bwrite (location, count, abfd) == count;
}

static bfd_boolean
aout_adobe_set_arch_mach (bfd *abfd,
			  enum bfd_architecture arch,
			  unsigned long machine)
{
  if (! bfd_default_set_arch_mach (abfd, arch, machine))
    return FALSE;

  if (arch == bfd_arch_unknown
      || arch == bfd_arch_m68k)
    return TRUE;

  return FALSE;
}

static int
aout_adobe_sizeof_headers (bfd *ignore_abfd ATTRIBUTE_UNUSED,
			   struct bfd_link_info *info ATTRIBUTE_UNUSED)
{
  return sizeof (struct internal_exec);
}

/* Build the transfer vector for Adobe A.Out files.  */

#define aout_32_find_line			    _bfd_nosymbols_find_line
#define aout_32_get_symbol_version_string	    _bfd_nosymbols_get_symbol_version_string
#define aout_32_bfd_make_debug_symbol		    _bfd_nosymbols_bfd_make_debug_symbol
#define aout_32_bfd_reloc_type_lookup		    _bfd_norelocs_bfd_reloc_type_lookup
#define aout_32_bfd_reloc_name_lookup		    _bfd_norelocs_bfd_reloc_name_lookup
#define aout_32_close_and_cleanup                   aout_32_bfd_free_cached_info
#define	aout_32_set_arch_mach		            aout_adobe_set_arch_mach
#define	aout_32_set_section_contents	            aout_adobe_set_section_contents
#define	aout_32_sizeof_headers		            aout_adobe_sizeof_headers
#define aout_32_bfd_get_relocated_section_contents  bfd_generic_get_relocated_section_contents
#define aout_32_get_section_contents_in_window      _bfd_generic_get_section_contents_in_window
#define aout_32_bfd_relax_section                   bfd_generic_relax_section
#define aout_32_bfd_gc_sections                     bfd_generic_gc_sections
#define aout_32_bfd_lookup_section_flags	    bfd_generic_lookup_section_flags
#define aout_32_bfd_merge_sections	            bfd_generic_merge_sections
#define aout_32_bfd_is_group_section	            bfd_generic_is_group_section
#define aout_32_bfd_discard_group	            bfd_generic_discard_group
#define aout_32_section_already_linked              _bfd_generic_section_already_linked
#define aout_32_bfd_define_common_symbol            bfd_generic_define_common_symbol
#define aout_32_bfd_link_hash_table_create          _bfd_generic_link_hash_table_create
#define aout_32_bfd_link_add_symbols	            _bfd_generic_link_add_symbols
#define aout_32_bfd_link_just_syms	            _bfd_generic_link_just_syms
#define aout_32_bfd_copy_link_hash_symbol_type \
  _bfd_generic_copy_link_hash_symbol_type
#define aout_32_bfd_final_link		            _bfd_generic_final_link
#define aout_32_bfd_link_split_section	            _bfd_generic_link_split_section
#define aout_32_bfd_link_check_relocs               _bfd_generic_link_check_relocs

const bfd_target aout_adobe_vec =
{
  "a.out.adobe",		/* Name.  */
  bfd_target_aout_flavour,
  BFD_ENDIAN_BIG,		/* Data byte order is unknown (big assumed).  */
  BFD_ENDIAN_BIG,		/* Header byte order is big.  */
  (HAS_RELOC | EXEC_P |		/* Object flags.  */
   HAS_LINENO | HAS_DEBUG |
   HAS_SYMS | HAS_LOCALS | WP_TEXT ),
  /* section flags */
  (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_CODE | SEC_DATA | SEC_RELOC),
  '_',				/* Symbol leading char.  */
  ' ',				/* AR_pad_char.  */
  16,				/* AR_max_namelen.  */
  0,				/* match priority.  */

  bfd_getb64, bfd_getb_signed_64, bfd_putb64,
  bfd_getb32, bfd_getb_signed_32, bfd_putb32,
  bfd_getb16, bfd_getb_signed_16, bfd_putb16,	/* Data.  */
  bfd_getb64, bfd_getb_signed_64, bfd_putb64,
  bfd_getb32, bfd_getb_signed_32, bfd_putb32,
  bfd_getb16, bfd_getb_signed_16, bfd_putb16,	/* Headers.  */

  {_bfd_dummy_target, aout_adobe_object_p,	/* bfd_check_format.  */
   bfd_generic_archive_p, _bfd_dummy_target},
  {bfd_false, aout_adobe_mkobject,		/* bfd_set_format.  */
   _bfd_generic_mkarchive, bfd_false},
  {bfd_false, aout_adobe_write_object_contents,/* bfd_write_contents.  */
   _bfd_write_archive_contents, bfd_false},

  BFD_JUMP_TABLE_GENERIC (aout_32),
  BFD_JUMP_TABLE_COPY (_bfd_generic),
  BFD_JUMP_TABLE_CORE (_bfd_nocore),
  BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_bsd),
  BFD_JUMP_TABLE_SYMBOLS (aout_32),
  BFD_JUMP_TABLE_RELOCS (aout_32),
  BFD_JUMP_TABLE_WRITE (aout_32),
  BFD_JUMP_TABLE_LINK (aout_32),
  BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),

  NULL,

  NULL
};