gas/config/obj-som.c

/* SOM object file format.
   Copyright (C) 1993-2016 Free Software Foundation, Inc.

   This file is part of GAS, the GNU Assembler.

   GAS 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,
   or (at your option) any later version.

   GAS 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 GAS; see the file COPYING.  If not, write to the Free
   Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
   02110-1301, USA.

   Written by the Center for Software Science at the University of Utah
   and by Cygnus Support.  */

#include "as.h"
#include "subsegs.h"
#include "aout/stab_gnu.h"

static int version_seen = 0;
static int copyright_seen = 0;
static int compiler_seen = 0;

/* Unused by SOM.  */

void
obj_read_begin_hook (void)
{
}

/* Handle a .compiler directive.   This is intended to create the
   compilation unit auxiliary header for MPE such that the linkeditor
   can handle SOM extraction from archives. The format of the quoted
   string is "sourcefile language version" and is delimited by blanks.  */

void
obj_som_compiler (int unused ATTRIBUTE_UNUSED)
{
  char *buf;
  char c;
  char *filename;
  char *language_name;
  char *p;
  char *version_id;

  if (compiler_seen)
    {
      as_bad (_("Only one .compiler pseudo-op per file!"));
      ignore_rest_of_line ();
      return;
    }

  SKIP_WHITESPACE ();
  if (*input_line_pointer == '\"')
    {
      buf = input_line_pointer;
      ++input_line_pointer;
      while (is_a_char (next_char_of_string ()))
	;
      c = *input_line_pointer;
      *input_line_pointer = '\000';
    }
  else
    {
      as_bad (_("Expected quoted string"));
      ignore_rest_of_line ();
      return;
    }

  /* Parse the quoted string into its component parts.  Skip the
     quote.  */
  filename = buf + 1;
  p = filename;
  while (*p != ' ' && *p != '\000')
    p++;
  if (*p == '\000')
    {
      as_bad (_(".compiler directive missing language and version"));
      return;
    }
  *p = '\000';

  language_name = ++p;
  while (*p != ' ' && *p != '\000')
    p++;
  if (*p == '\000')
    {
      as_bad (_(".compiler directive missing version"));
      return;
    }
  *p = '\000';

  version_id = ++p;
  while (*p != '\000')
    p++;
  /* Remove the trailing quote.  */
  *(--p) = '\000';

  compiler_seen = 1;
  if (! bfd_som_attach_compilation_unit (stdoutput, filename, language_name,
					 "GNU Tools", version_id))
    {
      bfd_perror (stdoutput->filename);
      as_fatal (_("FATAL: Attaching compiler header %s"), stdoutput->filename);
    }
  *input_line_pointer = c;
  demand_empty_rest_of_line ();
}

/* Handle a .version directive.  */

void
obj_som_version (int unused ATTRIBUTE_UNUSED)
{
  char *version, c;

  if (version_seen)
    {
      as_bad (_("Only one .version pseudo-op per file!"));
      ignore_rest_of_line ();
      return;
    }

  SKIP_WHITESPACE ();
  if (*input_line_pointer == '\"')
    {
      version = input_line_pointer;
      ++input_line_pointer;
      while (is_a_char (next_char_of_string ()))
	;
      c = *input_line_pointer;
      *input_line_pointer = '\000';
    }
  else
    {
      as_bad (_("Expected quoted string"));
      ignore_rest_of_line ();
      return;
    }

  version_seen = 1;
  if (!bfd_som_attach_aux_hdr (stdoutput, VERSION_AUX_ID, version))
    as_fatal (_("attaching version header %s: %s"),
	      stdoutput->filename, bfd_errmsg (bfd_get_error ()));

  *input_line_pointer = c;
  demand_empty_rest_of_line ();
}

/* Handle a .copyright directive.   This probably isn't complete, but
   it's of dubious value anyway and (IMHO) not worth the time to finish.
   If you care about copyright strings that much, you fix it.  */

void
obj_som_copyright (int unused ATTRIBUTE_UNUSED)
{
  char *copyright, c;

  if (copyright_seen)
    {
      as_bad (_("Only one .copyright pseudo-op per file!"));
      ignore_rest_of_line ();
      return;
    }

  SKIP_WHITESPACE ();
  if (*input_line_pointer == '\"')
    {
      copyright = input_line_pointer;
      ++input_line_pointer;
      while (is_a_char (next_char_of_string ()))
	;
      c = *input_line_pointer;
      *input_line_pointer = '\000';
    }
  else
    {
      as_bad (_("Expected quoted string"));
      ignore_rest_of_line ();
      return;
    }

  copyright_seen = 1;
  if (!bfd_som_attach_aux_hdr (stdoutput, COPYRIGHT_AUX_ID, copyright))
    as_fatal (_("attaching copyright header %s: %s"),
	      stdoutput->filename, bfd_errmsg (bfd_get_error ()));

  *input_line_pointer = c;
  demand_empty_rest_of_line ();
}

/* Perform any initialization necessary for stabs support.

   For SOM we need to create the space which will contain the
   two stabs subspaces.  Additionally we need to set up the
   space/subspace relationships and set space/subspace attributes
   which BFD does not understand.  */

void
obj_som_init_stab_section (segT seg)
{
  segT saved_seg = now_seg;
  segT space;
  subsegT saved_subseg = now_subseg;
  char *p;
 const char * file;
  unsigned int stroff;

  /* Make the space which will contain the debug subspaces.  */
  space = bfd_make_section_old_way (stdoutput, "$GDB_DEBUG$");

  /* Set SOM specific attributes for the space.  In particular we set
     the space "defined", "private", "sort_key", and "spnum" values.

     Due to a bug in pxdb (called by hpux linker), the sort keys
     of the various stabs spaces/subspaces need to be "small".  We
     reserve range 72/73 which appear to work well.  */
  obj_set_section_attributes (space, 1, 1, 72, 2);
  bfd_set_section_alignment (stdoutput, space, 2);

  /* Set the containing space for both stab sections to be $GDB_DEBUG$
     (just created above).  Also set some attributes which BFD does
     not understand.  In particular, access bits, sort keys, and load
     quadrant.  */
  obj_set_subsection_attributes (seg, space, 0x1f, 73, 0, 0, 0, 0);
  bfd_set_section_alignment (stdoutput, seg, 2);

  /* Make some space for the first special stab entry and zero the memory.
     It contains information about the length of this file's
     stab string and the like.  Using it avoids the need to
     relocate the stab strings.

     The $GDB_STRINGS$ space will be created as a side effect of
     the call to get_stab_string_offset.  */
  p = frag_more (12);
  memset (p, 0, 12);
  file = as_where ((unsigned int *) NULL);
  stroff = get_stab_string_offset (file, "$GDB_STRINGS$");
  know (stroff == 1);
  md_number_to_chars (p, stroff, 4);
  seg_info (seg)->stabu.p = p;

  /* Set the containing space for both stab sections to be $GDB_DEBUG$
     (just created above).  Also set some attributes which BFD does
     not understand.  In particular, access bits, sort keys, and load
     quadrant.  */
  seg = bfd_get_section_by_name (stdoutput, "$GDB_STRINGS$");
  obj_set_subsection_attributes (seg, space, 0x1f, 72, 0, 0, 0, 0);
  bfd_set_section_alignment (stdoutput, seg, 2);

  subseg_set (saved_seg, saved_subseg);
}

/* Fill in the counts in the first entry in a .stabs section.  */

static void
adjust_stab_sections (bfd *abfd, asection *sec, void *xxx ATTRIBUTE_UNUSED)
{
  asection *strsec;
  char *p;
  int strsz, nsyms;

  if (strcmp ("$GDB_SYMBOLS$", sec->name))
    return;

  strsec = bfd_get_section_by_name (abfd, "$GDB_STRINGS$");
  if (strsec)
    strsz = bfd_section_size (abfd, strsec);
  else
    strsz = 0;
  nsyms = bfd_section_size (abfd, sec) / 12 - 1;

  p = seg_info (sec)->stabu.p;
  gas_assert (p != 0);

  bfd_h_put_16 (abfd, (bfd_vma) nsyms, (bfd_byte *) p + 6);
  bfd_h_put_32 (abfd, (bfd_vma) strsz, (bfd_byte *) p + 8);
}

/* Called late in the assembly phase to adjust the special
   stab entry and to set the starting address for each code subspace.  */

void
som_frob_file (void)
{
  bfd_map_over_sections (stdoutput, adjust_stab_sections, (void *) 0);
}

static void
obj_som_weak (int ignore ATTRIBUTE_UNUSED)
{
  char *name;
  int c;
  symbolS *symbolP;

  do
    {
      c = get_symbol_name (&name);
      symbolP = symbol_find_or_make (name);
      *input_line_pointer = c;
      SKIP_WHITESPACE_AFTER_NAME ();
      S_SET_WEAK (symbolP);
      if (c == ',')
	{
	  input_line_pointer++;
	  SKIP_WHITESPACE ();
	  if (*input_line_pointer == '\n')
	    c = '\n';
	}
    }
  while (c == ',');
  demand_empty_rest_of_line ();
}

const pseudo_typeS obj_pseudo_table[] =
{
  {"weak", obj_som_weak, 0},
  {NULL, NULL, 0}
};