beos.em

来自「基于4个mips核的noc设计」· EM 代码 · 共 842 行 · 第 1/2 页

}

static void
gld_${EMULATION_NAME}_after_open()
{
  /* Pass the wacky PE command line options into the output bfd.
     FIXME: This should be done via a function, rather than by
     including an internal BFD header.  */
  if (!coff_data(output_bfd)->pe)
    {
      einfo ("%F%P: PE operations on non PE file.\n");
    }

  pe_data(output_bfd)->pe_opthdr = pe;
  pe_data(output_bfd)->dll = init[DLLOFF].value;

}

/* Callback functions for qsort in sort_sections. */

static int
sort_by_file_name (a, b)
     void *a;
     void *b;
{
  lang_statement_union_type **ra = a;
  lang_statement_union_type **rb = b;
  int i, a_sec, b_sec;

  i = strcmp ((*ra)->input_section.ifile->the_bfd->my_archive->filename,
	      (*rb)->input_section.ifile->the_bfd->my_archive->filename);
  if (i != 0)
    return i;

  i = strcmp ((*ra)->input_section.ifile->filename,
		 (*rb)->input_section.ifile->filename);
  if (i != 0)
    return i;
  /* the tail idata4/5 are the only ones without relocs to an
     idata$6 section unless we are importing by ordinal, 
     so sort them to last to terminate the IAT
     and HNT properly. if no reloc this one is import by ordinal
     so we have to sort by section contents */

  if ( ((*ra)->input_section.section->reloc_count + (*rb)->input_section.section->reloc_count) )
    {
       i =  (((*ra)->input_section.section->reloc_count > 
		 (*rb)->input_section.section->reloc_count) ? -1 : 0);
       if ( i != 0)
         return i;

        return  (((*ra)->input_section.section->reloc_count > 
		 (*rb)->input_section.section->reloc_count) ? 0 : 1);
    }
  else
    {
       if ( (strcmp( (*ra)->input_section.section->name, ".idata$6") == 0) )
          return 0; /* don't sort .idata$6 or .idata$7 FIXME dlltool eliminate .idata$7 */

       if (! bfd_get_section_contents ((*ra)->input_section.ifile->the_bfd, 
         (*ra)->input_section.section, &a_sec, (file_ptr) 0, (bfd_size_type)sizeof(a_sec)))
            einfo ("%F%B: Can't read contents of section .idata: %E\n",
                 (*ra)->input_section.ifile->the_bfd);

       if (! bfd_get_section_contents ((*rb)->input_section.ifile->the_bfd, 
        (*rb)->input_section.section, &b_sec, (file_ptr) 0, (bfd_size_type)sizeof(b_sec) ))
           einfo ("%F%B: Can't read contents of section .idata: %E\n",
                (*rb)->input_section.ifile->the_bfd);

      i =  ((a_sec < b_sec) ? -1 : 0);
      if ( i != 0)
        return i;
      return  ((a_sec < b_sec) ? 0 : 1);
   }
return 0;
}

static int
sort_by_section_name (a, b)
     void *a;
     void *b;
{
  lang_statement_union_type **ra = a;
  lang_statement_union_type **rb = b;
  int i;
  i = strcmp ((*ra)->input_section.section->name,
		 (*rb)->input_section.section->name);
/* this is a hack to make .stab and .stabstr last, so we don't have
   to fix strip/objcopy for .reloc sections.
   FIXME stripping images with a .rsrc section still needs to be fixed */
  if ( i != 0)
    {
      if ((strncmp ((*ra)->input_section.section->name, ".stab", 5) == 0)
           && (strncmp ((*rb)->input_section.section->name, ".stab", 5) != 0))
         return 1;
      return i;
    }
  return i;
}

/* Subroutine of sort_sections to a contiguous subset of a list of sections.
   NEXT_AFTER is the element after the last one to sort.
   The result is a pointer to the last element's "next" pointer.  */

static lang_statement_union_type **
sort_sections_1 (startptr, next_after, count, sort_func)
     lang_statement_union_type **startptr,*next_after;
     int count;
     int (*sort_func) ();
{
  lang_statement_union_type **vec;
  lang_statement_union_type *p;
  int i;
  lang_statement_union_type **ret;

  if (count == 0)
    return startptr;

  vec = ((lang_statement_union_type **)
	 xmalloc (count * sizeof (lang_statement_union_type *)));

  for (p = *startptr, i = 0; i < count; i++, p = p->next)
    vec[i] = p;

  qsort (vec, count, sizeof (vec[0]), sort_func);

  /* Fill in the next pointers again. */
  *startptr = vec[0];
  for (i = 0; i < count - 1; i++)
    vec[i]->header.next = vec[i + 1];
  vec[i]->header.next = next_after;
  ret = &vec[i]->header.next;
  free (vec);
  return ret;
}

/* Sort the .idata\$foo input sections of archives into filename order.
   The reason is so dlltool can arrange to have the pe dll import information
   generated correctly - the head of the list goes into dh.o, the tail into
   dt.o, and the guts into ds[nnnn].o.  Note that this is only needed for the
   .idata section.
   FIXME: This may no longer be necessary with grouped sections.  Instead of
   sorting on dh.o, ds[nnnn].o, dt.o, one could, for example, have dh.o use
   .idata\$4h, have ds[nnnn].o use .idata\$4s[nnnn], and have dt.o use .idata\$4t.
   This would have to be elaborated upon to handle multiple dll's
   [assuming such an eloboration is possible of course].

   We also sort sections in '\$' wild statements.  These are created by the
   place_orphans routine to implement grouped sections.  */

static void
sort_sections (s)
     lang_statement_union_type *s;
{
  for (; s ; s = s->next)
    switch (s->header.type)
      {
      case lang_output_section_statement_enum:
	sort_sections (s->output_section_statement.children.head);
	break;
      case lang_wild_statement_enum:
	{
	  lang_statement_union_type **p = &s->wild_statement.children.head;

	  /* Is this the .idata section?  */
	  if (s->wild_statement.section_name != NULL
	      && strncmp (s->wild_statement.section_name, ".idata", 6) == 0)
	    {
	      /* Sort the children.  We want to sort any objects in
                 the same archive.  In order to handle the case of
                 including a single archive multiple times, we sort
                 all the children by archive name and then by object
                 name.  After sorting them, we re-thread the pointer
                 chain.  */

	      while (*p)
		{
		  lang_statement_union_type *start = *p;
		  if (start->header.type != lang_input_section_enum
		      || !start->input_section.ifile->the_bfd->my_archive)
		    p = &(start->header.next);
		  else
		    {
		      lang_statement_union_type *end;
		      int count;

		      for (end = start, count = 0;
			   end && end->header.type == lang_input_section_enum;
			   end = end->next)
			count++;

		      p = sort_sections_1 (p, end, count, sort_by_file_name);
		    }
		}
	      break;
	    }

	  /* If this is a collection of grouped sections, sort them.
	     The linker script must explicitly mention "*(.foo\$)" or
	     "*(.foo\$*)".  Don't sort them if \$ is not the last
	     character (not sure if this is really useful, but it
	     allows explicitly mentioning some \$ sections and letting
	     the linker handle the rest).  */
	  if (s->wild_statement.section_name != NULL)
	    {
	      char *q = strchr (s->wild_statement.section_name, '\$');

	      if (q != NULL
		  && (q[1] == '\0'
		      || (q[1] == '*' && q[2] == '\0')))
		{
		  lang_statement_union_type *end;
		  int count;

		  for (end = *p, count = 0; end; end = end->next)
		    {
		      if (end->header.type != lang_input_section_enum)
			abort ();
		      count++;
		    }
		  (void) sort_sections_1 (p, end, count, sort_by_section_name);
		}
	      break;
	    }
	}
	break;
      default:
	break;
      }
}

static void  
gld_${EMULATION_NAME}_before_allocation()
{
  extern lang_statement_list_type *stat_ptr;

#ifdef TARGET_IS_ppcpe
  /* Here we rummage through the found bfds to collect toc information */
  {
    LANG_FOR_EACH_INPUT_STATEMENT (is)
      {
	if (!ppc_process_before_allocation(is->the_bfd, &link_info))
	  {
	    einfo("Errors encountered processing file %s\n", is->filename);
	  }
      }
  }

  /* We have seen it all. Allocate it, and carry on */
  ppc_allocate_toc_section (&link_info);
#else
#ifdef TARGET_IS_armpe
  /* FIXME: we should be able to set the size of the interworking stub
     section.

     Here we rummage through the found bfds to collect glue
     information.  FIXME: should this be based on a command line
     option?  [e-mail] */
  {
    LANG_FOR_EACH_INPUT_STATEMENT (is)
      {
	if (!arm_process_before_allocation (is->the_bfd, & link_info))
	  {
	    einfo ("Errors encountered processing file %s", is->filename);
	  }
      }
  }

  /* We have seen it all. Allocate it, and carry on */
  arm_allocate_interworking_sections (& link_info);
#endif /* TARGET_IS_armpe */
#endif /* TARGET_IS_ppcpe */

  sort_sections (stat_ptr->head);
}

/* Place an orphan section.  We use this to put sections with a '\$' in them
   into the right place.  Any section with a '\$' in them (e.g. .text\$foo)
   gets mapped to the output section with everything from the '\$' on stripped
   (e.g. .text).
   See the Microsoft Portable Executable and Common Object File Format
   Specification 4.1, section 4.2, Grouped Sections.

   FIXME: This is now handled by the linker script using wildcards,
   but I'm leaving this here in case we want to enable it for sections
   which are not mentioned in the linker script.  */

/*ARGSUSED*/
static boolean
gld${EMULATION_NAME}_place_orphan (file, s)
     lang_input_statement_type *file;
     asection *s;
{
  const char *secname;
  char *output_secname, *ps;
  lang_output_section_statement_type *os;
  lang_statement_union_type *l;

  if ((s->flags & SEC_ALLOC) == 0)
    return false;

  /* Don't process grouped sections unless doing a final link.
     If they're marked as COMDAT sections, we don't want .text\$foo to
     end up in .text and then have .text disappear because it's marked
     link-once-discard.  */
  if (link_info.relocateable)
    return false;

  secname = bfd_get_section_name (s->owner, s);

  /* Everything from the '\$' on gets deleted so don't allow '\$' as the
     first character.  */
  if (*secname == '\$')
    einfo ("%P%F: section %s has '\$' as first character\n", secname);
  if (strchr (secname + 1, '\$') == NULL)
    return false;

  /* Look up the output section.  The Microsoft specs say sections names in
     image files never contain a '\$'.  Fortunately, lang_..._lookup creates
     the section if it doesn't exist.  */
  output_secname = xstrdup (secname);
  ps = strchr (output_secname + 1, '\$');
  *ps = 0;
  os = lang_output_section_statement_lookup (output_secname);

  /* Find the '\$' wild statement for this section.  We currently require the
     linker script to explicitly mention "*(.foo\$)".
     FIXME: ppcpe.sc has .CRT\$foo in the .rdata section.  According to the
     Microsoft docs this isn't correct so it's not (currently) handled.  */

  ps[0] = '\$';
  ps[1] = 0;
  for (l = os->children.head; l; l = l->next)
    {
      if (l->header.type == lang_wild_statement_enum
	  && strcmp (l->wild_statement.section_name, output_secname) == 0)
	break;
    }
  ps[0] = 0;
  if (l == NULL)
#if 1
    einfo ("%P%F: *(%s\$) missing from linker script\n", output_secname);
#else /* FIXME: This block is untried.  It exists to convey the intent,
	 should one decide to not require *(.foo\$) to appear in the linker
	 script.  */
    {
      lang_wild_statement_type *new = new_stat (lang_wild_statement,
						&os->children);
      new->section_name = xmalloc (strlen (output_secname) + 2);
      sprintf (new->section_name, "%s\$", output_secname);
      new->filename = NULL;
      lang_list_init (&new->children);
      l = new;
    }
#endif

  /* Link the input section in and we're done for now.
     The sections still have to be sorted, but that has to wait until
     all such sections have been processed by us.  The sorting is done by
     sort_sections.  */
  wild_doit (&l->wild_statement.children, s, os, file);

  return true;
}

static char *
gld_${EMULATION_NAME}_get_script(isfile)
     int *isfile;
EOF
# Scripts compiled in.
# sed commands to quote an ld script as a C string.
sc="-f stringify.sed"

cat >>e${EMULATION_NAME}.c <<EOF
{			     
  *isfile = 0;

  if (link_info.relocateable == true && config.build_constructors == true)
    return
EOF
sed $sc ldscripts/${EMULATION_NAME}.xu                     >> e${EMULATION_NAME}.c
echo '  ; else if (link_info.relocateable == true) return' >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.xr                     >> e${EMULATION_NAME}.c
echo '  ; else if (!config.text_read_only) return'         >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.xbn                    >> e${EMULATION_NAME}.c
echo '  ; else if (!config.magic_demand_paged) return'     >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.xn                     >> e${EMULATION_NAME}.c
echo '  ; else return'                                     >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.x                      >> e${EMULATION_NAME}.c
echo '; }'                                                 >> e${EMULATION_NAME}.c

cat >>e${EMULATION_NAME}.c <<EOF


struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation = 
{
  gld_${EMULATION_NAME}_before_parse,
  syslib_default,
  hll_default,
  after_parse_default,
  gld_${EMULATION_NAME}_after_open,
  after_allocation_default,
  set_output_arch_default,
  ldemul_default_target,
  gld_${EMULATION_NAME}_before_allocation,
  gld_${EMULATION_NAME}_get_script,
  "${EMULATION_NAME}",
  "${OUTPUT_FORMAT}",
  NULL, /* finish */
  NULL, /* create output section statements */
  NULL, /* open dynamic archive */
  gld${EMULATION_NAME}_place_orphan,
  gld_${EMULATION_NAME}_set_symbols,
  gld_${EMULATION_NAME}_parse_args,
  NULL,	/* unrecognized file */
  NULL,	/* list options */
  NULL,	/* recognized file */
  NULL 	/* find_potential_libraries */
};
EOF