binutils-gdb/gas/config/obj-coffbfd.c

/* coff object file format with bfd
   Copyright (C) 1989, 1990, 1991, 1993 Free Software Foundation, Inc.

This file is part of GAS.

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 2, 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, 675 Mass Ave, Cambridge, MA 02139, USA.  */

/*

 How does this releate to the rest of GAS ?

 Well, all the other files in gas are more or less a black box. It
 takes care of opening files, parsing command lines, stripping blanks
 etc etc. This module gets a chance to register what it wants to do by
 saying that it is interested in various pseduo ops. The other big
 change is write_object_file. This runs through all the data
 structures that gas builds, and outputs the file in the format of our
 choice.

 Hacked for BFDness by steve chamberlain

 This object module now supports everything but the i960 and i860.

 sac@cygnus.com
*/

#include "as.h"
#include "obstack.h"
#include "subsegs.h"
#include "frags.h"
#include "../bfd/libbfd.h"
#include "../bfd/libcoff.h"

/* The NOP_OPCODE is for the alignment fill value.  Fill with nop so
   that we can stick sections together without causing trouble.  */
#ifndef NOP_OPCODE
#define NOP_OPCODE 0x00
#endif

#define MIN(a,b) ((a) < (b)? (a) : (b))
/* This vector is used to turn an internal segment into a section #
   suitable for insertion into a coff symbol table
 */

const short seg_N_TYPE[] =
{				/* in: segT   out: N_TYPE bits */
  C_ABS_SECTION,
  1,
  2,
  3,
  4,
  5,
  6,
  7,
  8,
  9,
  10,
  C_UNDEF_SECTION,		/* SEG_UNKNOWN */
  C_UNDEF_SECTION,		/* SEG_GOOF */
  C_UNDEF_SECTION,		/* SEG_EXPR */
  C_DEBUG_SECTION,		/* SEG_DEBUG */
  C_NTV_SECTION,		/* SEG_NTV */
  C_PTV_SECTION,		/* SEG_PTV */
  C_REGISTER_SECTION,		/* SEG_REGISTER */
};


int function_lineoff = -1;	/* Offset in line#s where the last function
				   started (the odd entry for line #0) */

static symbolS *last_line_symbol;

/* Add 4 to the real value to get the index and compensate the
   negatives. This vector is used by S_GET_SEGMENT to turn a coff
   section number into a segment number
*/
static symbolS *previous_file_symbol = NULL;
void c_symbol_merge ();
static int line_base;

symbolS *c_section_symbol ();
bfd *abfd;
void EXFUN (bfd_as_write_hook, (struct internal_filehdr *,
				bfd * abfd));

static void EXFUN (fixup_segment, (segment_info_type *segP,
				   segT this_segment_type));


static void EXFUN (fixup_mdeps, (fragS *,
				 object_headers *,
				 segT));


static void EXFUN (fill_section, (bfd * abfd,
				  object_headers *,
				  unsigned long *));


char *EXFUN (s_get_name, (symbolS * s));
static symbolS *EXFUN (tag_find_or_make, (char *name));
static symbolS *EXFUN (tag_find, (char *name));


static int
  EXFUN (c_line_new, (
		       symbolS * symbol,
		       long paddr,
		       unsigned short line_number,
		       fragS * frag));


static void EXFUN (w_symbols,
		     (bfd * abfd,
		      char *where,
		      symbolS * symbol_rootP));

static char *stack_pop PARAMS ((stack * st));
static char *stack_push PARAMS ((stack * st, char *element));
#if 0
static char *stack_top PARAMS ((stack * st));
#endif
static stack *stack_init PARAMS ((unsigned long chunk_size,
				  unsigned long element_size));


static void tag_init PARAMS ((void));
static void tag_insert PARAMS ((char *name, symbolS * symbolP));

static struct hash_control *tag_hash;

static symbolS *def_symbol_in_progress = NULL;

static void obj_coff_def PARAMS ((int));
static void obj_coff_lcomm PARAMS ((int));
static void obj_coff_dim PARAMS ((int));
static void obj_coff_text PARAMS ((int));
static void obj_coff_data PARAMS ((int));
static void obj_coff_bss PARAMS ((int));
static void obj_coff_ident PARAMS ((int));
static void obj_coff_endef PARAMS ((int));
static void obj_coff_line PARAMS ((int));
static void obj_coff_ln PARAMS ((int));
static void obj_coff_scl PARAMS ((int));
static void obj_coff_size PARAMS ((int));
static void obj_coff_tag PARAMS ((int));
static void obj_coff_type PARAMS ((int));
static void obj_coff_val PARAMS ((int));
void obj_coff_section PARAMS ((int));

const pseudo_typeS obj_pseudo_table[] =
{
  {"def", obj_coff_def, 0},
  {"dim", obj_coff_dim, 0},
  {"endef", obj_coff_endef, 0},
  {"line", obj_coff_line, 0},
  {"ln", obj_coff_ln, 0},
  {"appline", obj_coff_ln, 1},
  {"scl", obj_coff_scl, 0},
  {"size", obj_coff_size, 0},
  {"tag", obj_coff_tag, 0},
  {"type", obj_coff_type, 0},
  {"val", obj_coff_val, 0},
  {"section", obj_coff_section, 0},
  {"use", obj_coff_section, 0},
  {"sect", obj_coff_section, 0},
  {"text", obj_coff_text, 0},
  {"data", obj_coff_data, 0},
  {"bss", obj_coff_bss, 0},
  {"ident", obj_coff_ident, 0},
  {"ABORT", s_abort, 0},
  {"lcomm", obj_coff_lcomm, 0},
#ifdef TC_M88K
  /* The m88k uses sdef instead of def.  */
  {"sdef", obj_coff_def, 0},
#endif
  {NULL}			/* end sentinel */
};				/* obj_pseudo_table */



/* Section stuff

   We allow more than just the standard 3 sections, infact, we allow
   10 sections, (though the usual three have to be there).

   This structure performs the mappings for us:

*/

/* OBS stuff
static struct internal_scnhdr bss_section_header;
struct internal_scnhdr data_section_header;
struct internal_scnhdr text_section_header;

const segT N_TYPE_seg [32] =
{

};

*/

#define N_SEG 32
typedef struct
{
  segT seg_t;  
  int i;  
} seg_info_type;

seg_info_type seg_info_off_by_4[N_SEG] = 
{
 {SEG_PTV,  },
 {SEG_NTV,  },
 {SEG_DEBUG, },
 {SEG_ABSOLUTE,  },
 {SEG_UNKNOWN,	 },
 {SEG_E0}, 
 {SEG_E1},
 {SEG_E2},
 {SEG_E3},
 {SEG_E4},
 {SEG_E5},
 {SEG_E6},
 {SEG_E7},
 {SEG_E8}, 
 {SEG_E9},
 {(segT)15},
 {(segT)16},
 {(segT)17},
 {(segT)18},
 {(segT)19},
 {(segT)20},
 {(segT)0},
 {(segT)0},
 {(segT)0},
 {SEG_REGISTER}
};



#define SEG_INFO_FROM_SECTION_NUMBER(x) (seg_info_off_by_4[(x)+4])
#define SEG_INFO_FROM_SEG_NUMBER(x) (seg_info_off_by_4[(x)])


static relax_addressT
DEFUN (relax_align, (address, alignment),
       register relax_addressT address AND
       register long alignment)
{
  relax_addressT mask;
  relax_addressT new_address;

  mask = ~((~0) << alignment);
  new_address = (address + mask) & (~mask);
  return (new_address - address);
}				/* relax_align() */


segT
DEFUN (s_get_segment, (x),
       symbolS * x)
{
  return SEG_INFO_FROM_SECTION_NUMBER (x->sy_symbol.ost_entry.n_scnum).seg_t;
}



/* calculate the size of the frag chain and fill in the section header
   to contain all of it, also fill in the addr of the sections */
static unsigned int
DEFUN (size_section, (abfd, idx),
       bfd * abfd AND
       unsigned int idx)
{

  unsigned int size = 0;
  fragS *frag = segment_info[idx].frchainP->frch_root;
  while (frag)
    {
      size = frag->fr_address;
      if (frag->fr_address != size)
	{
	  printf ("Out of step\n");
	  size = frag->fr_address;
	}

      switch (frag->fr_type)
	{
#ifdef TC_COFF_SIZEMACHDEP
	case rs_machine_dependent:
	  size += TC_COFF_SIZEMACHDEP (frag);
	  break;
#endif
	case rs_fill:
	case rs_org:
	  size += frag->fr_fix;
	  size += frag->fr_offset * frag->fr_var;
	  break;
	case rs_align:
	  size += frag->fr_fix;
	  size += relax_align (size, frag->fr_offset);
	  break;
	default:
	  BAD_CASE (frag->fr_type);
	  break;
	}
      frag = frag->fr_next;
    }
  segment_info[idx].scnhdr.s_size = size;
  return size;
}


static unsigned int
DEFUN (count_entries_in_chain, (idx),
       unsigned int idx)
{
  unsigned int nrelocs;
  fixS *fixup_ptr;

  /* Count the relocations */
  fixup_ptr = segment_info[idx].fix_root;
  nrelocs = 0;
  while (fixup_ptr != (fixS *) NULL)
    {
      if (TC_COUNT_RELOC (fixup_ptr))
	{

#ifdef TC_A29K

	  if (fixup_ptr->fx_r_type == RELOC_CONSTH)
	    nrelocs += 2;
	  else
	    nrelocs++;
#else
	  nrelocs++;
#endif
	}

      fixup_ptr = fixup_ptr->fx_next;
    }
  return nrelocs;
}

/* output all the relocations for a section */
void
DEFUN (do_relocs_for, (abfd, h, file_cursor),
       bfd * abfd AND
       object_headers * h AND
       unsigned long *file_cursor)
{
  unsigned int nrelocs;
  unsigned int idx;
  unsigned long reloc_start = *file_cursor;

  for (idx = SEG_E0; idx < SEG_E9; idx++)
    {
      if (segment_info[idx].scnhdr.s_name[0])
	{
	  struct external_reloc *ext_ptr;
	  struct external_reloc *external_reloc_vec;
	  unsigned int external_reloc_size;
	  unsigned int base = segment_info[idx].scnhdr.s_paddr;
	  fixS *fix_ptr = segment_info[idx].fix_root;
	  nrelocs = count_entries_in_chain (idx);

	  if (nrelocs)
	    /* Bypass this stuff if no relocs.  This also incidentally
	       avoids a SCO bug, where free(malloc(0)) tends to crash.  */
	    {
	      external_reloc_size = nrelocs * RELSZ;
	      external_reloc_vec =
		(struct external_reloc *) malloc (external_reloc_size);

	      ext_ptr = external_reloc_vec;

	      /* Fill in the internal coff style reloc struct from the
		 internal fix list.  */
	      while (fix_ptr)
		{
		  symbolS *symbol_ptr;
		  struct internal_reloc intr;

		  /* Only output some of the relocations */
		  if (TC_COUNT_RELOC (fix_ptr))
		    {
#ifdef TC_RELOC_MANGLE
		      TC_RELOC_MANGLE (fix_ptr, &intr, base);

#else
		      symbolS *dot;
		      symbol_ptr = fix_ptr->fx_addsy;

		      intr.r_type = TC_COFF_FIX2RTYPE (fix_ptr);
		      intr.r_vaddr =
			base + fix_ptr->fx_frag->fr_address + fix_ptr->fx_where;

#ifdef TC_M88K
		      intr.r_offset = fix_ptr->fx_offset;
#else
		      intr.r_offset = 0;
#endif

		      /* Turn the segment of the symbol into an offset.  */
		      if (symbol_ptr)
			{
			  dot = segment_info[S_GET_SEGMENT (symbol_ptr)].dot;
			  if (dot)
			    {
			      intr.r_symndx = dot->sy_number;
			    }
			  else
			    {
			      intr.r_symndx = symbol_ptr->sy_number;
			    }

			}
		      else
			{
			  intr.r_symndx = -1;
			}
#endif

		      (void) bfd_coff_swap_reloc_out (abfd, &intr, ext_ptr);
		      ext_ptr++;

#if defined(TC_A29K)

		      /* The 29k has a special kludge for the high 16 bit
			 reloc.  Two relocations are emited, R_IHIHALF,
			 and R_IHCONST. The second one doesn't contain a
			 symbol, but uses the value for offset.  */

		      if (intr.r_type == R_IHIHALF)
			{
			  /* now emit the second bit */
			  intr.r_type = R_IHCONST;
			  intr.r_symndx = fix_ptr->fx_addnumber;
			  (void) bfd_coff_swap_reloc_out (abfd, &intr, ext_ptr);
			  ext_ptr++;
			}
#endif
		    }

		  fix_ptr = fix_ptr->fx_next;
		}

	      /* Write out the reloc table */
	      bfd_write ((PTR) external_reloc_vec, 1, external_reloc_size,
			 abfd);
	      free (external_reloc_vec);

	      /* Fill in section header info.  */
	      segment_info[idx].scnhdr.s_relptr = *file_cursor;
	      *file_cursor += external_reloc_size;
	      segment_info[idx].scnhdr.s_nreloc = nrelocs;
	    }
	  else
	    {
	      /* No relocs */
	      segment_info[idx].scnhdr.s_relptr = 0;
	    }
	}
    }
  /* Set relocation_size field in file headers */
  H_SET_RELOCATION_SIZE (h, *file_cursor - reloc_start, 0);
}


/* run through a frag chain and write out the data to go with it, fill
   in the scnhdrs with the info on the file postions
*/
static void
DEFUN (fill_section, (abfd, h, file_cursor),
       bfd * abfd AND
       object_headers *h AND
       unsigned long *file_cursor)
{

  unsigned int i;
  unsigned int paddr = 0;

  for (i = SEG_E0; i < SEG_UNKNOWN; i++)
    {
      unsigned int offset = 0;

      struct internal_scnhdr *s = &(segment_info[i].scnhdr);

      if (s->s_name[0])
	{
	  fragS *frag = segment_info[i].frchainP->frch_root;
	  char *buffer;

	  if (s->s_size == 0)
	    s->s_scnptr = 0;
	  else
	    {
	      buffer = xmalloc (s->s_size);
	      s->s_scnptr = *file_cursor;
	    }
	  know (s->s_paddr == paddr);

	  if (strcmp (s->s_name, ".text") == 0)
	    s->s_flags |= STYP_TEXT;
	  else if (strcmp (s->s_name, ".data") == 0)
	    s->s_flags |= STYP_DATA;
	  else if (strcmp (s->s_name, ".bss") == 0)
	    {
	      s->s_scnptr = 0;
	      s->s_flags |= STYP_BSS;
#ifndef TC_I386
#ifndef TC_A29K
	      /* Apparently the SVR3 linker is confused by noload
		 sections.  So is the UDI mondfe program.  */
	      s->s_flags |= STYP_NOLOAD;
#endif
#endif
	    }
	  else if (strcmp (s->s_name, ".lit") == 0)
	    s->s_flags = STYP_LIT | STYP_TEXT;
	  else if (strcmp (s->s_name, ".init") == 0)
	    s->s_flags |= STYP_TEXT;
	  else if (strcmp (s->s_name, ".fini") == 0)
	    s->s_flags |= STYP_TEXT;
	  else if (strncmp (s->s_name, ".comment", 8) == 0)
	    s->s_flags |= STYP_INFO;

	  while (frag)
	    {
	      unsigned int fill_size;
	      switch (frag->fr_type)
		{
		case rs_machine_dependent:
		  if (frag->fr_fix)
		    {
		      memcpy (buffer + frag->fr_address,
			      frag->fr_literal,
			      (unsigned int) frag->fr_fix);
		      offset += frag->fr_fix;
		    }

		  break;
		case rs_fill:
		case rs_align:
		case rs_org:
		  if (frag->fr_fix)
		    {
		      memcpy (buffer + frag->fr_address,
			      frag->fr_literal,
			      (unsigned int) frag->fr_fix);
		      offset += frag->fr_fix;
		    }

		  fill_size = frag->fr_var;
		  if (fill_size && frag->fr_offset > 0)
		    {
		      unsigned int count;
		      unsigned int off = frag->fr_fix;
		      for (count = frag->fr_offset; count; count--)
			{
			  if (fill_size < s->s_size)
			    {
			      memcpy (buffer + frag->fr_address + off,
				      frag->fr_literal + frag->fr_fix,
				      fill_size);
			      off += fill_size;
			      offset += fill_size;
			    }
			}
		    }
		  break;
		case rs_broken_word:
		  break;
		default:
		  abort ();
		}
	      frag = frag->fr_next;
	    }

	  if (s->s_size != 0)
	    {
	      if (s->s_scnptr != 0)
		{
		  bfd_write (buffer, s->s_size, 1, abfd);
		  *file_cursor += s->s_size;
		}
	      free (buffer);
	    }
	  paddr += s->s_size;
	}
    }
}

/* Coff file generation & utilities */

static void
DEFUN (coff_header_append, (abfd, h),
       bfd * abfd AND
       object_headers * h)
{
  unsigned int i;
  char buffer[1000];
  char buffero[1000];

  bfd_seek (abfd, 0, 0);

#ifndef OBJ_COFF_OMIT_OPTIONAL_HEADER
  H_SET_MAGIC_NUMBER (h, COFF_MAGIC);
  H_SET_VERSION_STAMP (h, 0);
  H_SET_ENTRY_POINT (h, 0);
  H_SET_TEXT_START (h, segment_info[SEG_E0].frchainP->frch_root->fr_address);
  H_SET_DATA_START (h, segment_info[SEG_E1].frchainP->frch_root->fr_address);
  H_SET_SIZEOF_OPTIONAL_HEADER (h, bfd_coff_swap_aouthdr_out(abfd, &h->aouthdr,
							     buffero));
#else /* defined (OBJ_COFF_OMIT_OPTIONAL_HEADER) */
  H_SET_SIZEOF_OPTIONAL_HEADER (h, 0);
#endif /* defined (OBJ_COFF_OMIT_OPTIONAL_HEADER) */

  i = bfd_coff_swap_filehdr_out (abfd, &h->filehdr, buffer);

  bfd_write (buffer, i, 1, abfd);
  bfd_write (buffero, H_GET_SIZEOF_OPTIONAL_HEADER (h), 1, abfd);

  for (i = SEG_E0; i < SEG_E9; i++)
    {
      if (segment_info[i].scnhdr.s_name[0])
	{
	  unsigned int size =
	  bfd_coff_swap_scnhdr_out (abfd,
				    &(segment_info[i].scnhdr),
				    buffer);
	  bfd_write (buffer, size, 1, abfd);
	}
    }
}


char *
DEFUN (symbol_to_chars, (abfd, where, symbolP),
       bfd * abfd AND
       char *where AND
       symbolS * symbolP)
{
  unsigned int numaux = symbolP->sy_symbol.ost_entry.n_numaux;
  unsigned int i;
  valueT val;

  /* Turn any symbols with register attributes into abs symbols */
  if (S_GET_SEGMENT (symbolP) == SEG_REGISTER)
    {
      S_SET_SEGMENT (symbolP, SEG_ABSOLUTE);
    }
  /* At the same time, relocate all symbols to their output value */

  val = (segment_info[S_GET_SEGMENT (symbolP)].scnhdr.s_paddr
	 + S_GET_VALUE (symbolP));

  S_SET_VALUE (symbolP, val);

  symbolP->sy_symbol.ost_entry.n_value = val;

  where += bfd_coff_swap_sym_out (abfd, &symbolP->sy_symbol.ost_entry,
				  where);

  for (i = 0; i < numaux; i++)
    {
      where += bfd_coff_swap_aux_out (abfd,
				      &symbolP->sy_symbol.ost_auxent[i],
				      S_GET_DATA_TYPE (symbolP),
				      S_GET_STORAGE_CLASS (symbolP),
				      where);
    }
  return where;

}


void
obj_symbol_new_hook (symbolP)
     symbolS *symbolP;
{
  char underscore = 0;		/* Symbol has leading _ */

  /* Effective symbol */
  /* Store the pointer in the offset. */
  S_SET_ZEROES (symbolP, 0L);
  S_SET_DATA_TYPE (symbolP, T_NULL);
  S_SET_STORAGE_CLASS (symbolP, 0);
  S_SET_NUMBER_AUXILIARY (symbolP, 0);
  /* Additional information */
  symbolP->sy_symbol.ost_flags = 0;
  /* Auxiliary entries */
  memset ((char *) &symbolP->sy_symbol.ost_auxent[0], 0, AUXESZ);

#ifdef STRIP_UNDERSCORE
  /* Remove leading underscore at the beginning of the symbol.
	 * This is to be compatible with the standard librairies.
	 */
  if (*S_GET_NAME (symbolP) == '_')
    {
      underscore = 1;
      S_SET_NAME (symbolP, S_GET_NAME (symbolP) + 1);
    }				/* strip underscore */
#endif /* STRIP_UNDERSCORE */

  if (S_IS_STRING (symbolP))
    SF_SET_STRING (symbolP);
  if (!underscore && S_IS_LOCAL (symbolP))
    SF_SET_LOCAL (symbolP);

  return;
}				/* obj_symbol_new_hook() */

/* stack stuff */
static stack *
stack_init (chunk_size, element_size)
     unsigned long chunk_size;
     unsigned long element_size;
{
  stack *st;

  if ((st = (stack *) malloc (sizeof (stack))) == (stack *) 0)
    return (stack *) 0;
  if ((st->data = malloc (chunk_size)) == (char *) 0)
    {
      free (st);
      return (stack *) 0;
    }
  st->pointer = 0;
  st->size = chunk_size;
  st->chunk_size = chunk_size;
  st->element_size = element_size;
  return st;
}				/* stack_init() */

void
stack_delete (st)
     stack *st;
{
  free (st->data);
  free (st);
}

static char *
stack_push (st, element)
     stack *st;
     char *element;
{
  if (st->pointer + st->element_size >= st->size)
    {
      st->size += st->chunk_size;
      if ((st->data = xrealloc (st->data, st->size)) == (char *) 0)
	return (char *) 0;
    }
  memcpy (st->data + st->pointer, element, st->element_size);
  st->pointer += st->element_size;
  return st->data + st->pointer;
}				/* stack_push() */

static char *
stack_pop (st)
     stack *st;
{
  if (st->pointer < st->element_size)
    {
      st->pointer = 0;
      return (char *) 0;
    }
  st->pointer -= st->element_size;
  return st->data + st->pointer;
}

#if 0
/* Not used.  */
static char *
stack_top (st)
     stack *st;
{
  return st->data + st->pointer - st->element_size;
}
#endif

/*
 * Handle .ln directives.
 */

static void
obj_coff_ln (appline)
     int appline;
{
  int l;

  if (! appline && def_symbol_in_progress != NULL)
    {
      as_warn (".ln pseudo-op inside .def/.endef: ignored.");
      demand_empty_rest_of_line ();
      return;
    }				/* wrong context */

  c_line_new (0,
	      obstack_next_free (&frags) - frag_now->fr_literal,
	      l = get_absolute_expression (),
	      frag_now);
#ifndef NO_LISTING
  {
    extern int listing;

    if (listing)
      {
	if (! appline)
	  l += line_base - 1;
	listing_source_line ((unsigned int) l);
      }

  }
#endif
  demand_empty_rest_of_line ();
  return;
}				/* obj_coff_line() */

/*
 *			def()
 *
 * Handle .def directives.
 *
 * One might ask : why can't we symbol_new if the symbol does not
 * already exist and fill it with debug information.  Because of
 * the C_EFCN special symbol. It would clobber the value of the
 * function symbol before we have a chance to notice that it is
 * a C_EFCN. And a second reason is that the code is more clear this
 * way. (at least I think it is :-).
 *
 */

#define SKIP_SEMI_COLON()	while (*input_line_pointer++ != ';')
#define SKIP_WHITESPACES()	while (*input_line_pointer == ' ' || \
				      *input_line_pointer == '\t') \
                                         input_line_pointer++;

static void
DEFUN (obj_coff_def, (what),
       int what)
{
  char name_end;		/* Char after the end of name */
  char *symbol_name;		/* Name of the debug symbol */
  char *symbol_name_copy;	/* Temporary copy of the name */
  unsigned int symbol_name_length;
  /*$char*	directiveP;$ *//* Name of the pseudo opcode */
  /*$char directive[MAX_DIRECTIVE];$ *//* Backup of the directive */
  /*$char end = 0;$ *//* If 1, stop parsing */

  if (def_symbol_in_progress != NULL)
    {
      as_warn (".def pseudo-op used inside of .def/.endef: ignored.");
      demand_empty_rest_of_line ();
      return;
    }				/* if not inside .def/.endef */

  SKIP_WHITESPACES ();

  def_symbol_in_progress = (symbolS *) obstack_alloc (&notes, sizeof (*def_symbol_in_progress));
  memset (def_symbol_in_progress, 0, sizeof (*def_symbol_in_progress));

  symbol_name = input_line_pointer;
  name_end = get_symbol_end ();
  symbol_name_length = strlen (symbol_name);
  symbol_name_copy = xmalloc (symbol_name_length + 1);
  strcpy (symbol_name_copy, symbol_name);

  /* Initialize the new symbol */
#ifdef STRIP_UNDERSCORE
  S_SET_NAME (def_symbol_in_progress, (*symbol_name_copy == '_'
				       ? symbol_name_copy + 1
				       : symbol_name_copy));
#else /* STRIP_UNDERSCORE */
  S_SET_NAME (def_symbol_in_progress, symbol_name_copy);
#endif /* STRIP_UNDERSCORE */
  /* free(symbol_name_copy); */
  def_symbol_in_progress->sy_name_offset = (unsigned long) ~0;
  def_symbol_in_progress->sy_number = ~0;
  def_symbol_in_progress->sy_frag = &zero_address_frag;
  S_SET_VALUE (def_symbol_in_progress, 0);

  if (S_IS_STRING (def_symbol_in_progress))
    {
      SF_SET_STRING (def_symbol_in_progress);
    }				/* "long" name */

  *input_line_pointer = name_end;

  demand_empty_rest_of_line ();
  return;
}				/* obj_coff_def() */

unsigned int dim_index;

static void
obj_coff_endef (ignore)
     int ignore;
{
  symbolS *symbolP = 0;
  /* DIM BUG FIX sac@cygnus.com */
  dim_index = 0;
  if (def_symbol_in_progress == NULL)
    {
      as_warn (".endef pseudo-op used outside of .def/.endef: ignored.");
      demand_empty_rest_of_line ();
      return;
    }				/* if not inside .def/.endef */

  /* Set the section number according to storage class. */
  switch (S_GET_STORAGE_CLASS (def_symbol_in_progress))
    {
    case C_STRTAG:
    case C_ENTAG:
    case C_UNTAG:
      SF_SET_TAG (def_symbol_in_progress);
      /* intentional fallthrough */
    case C_FILE:
    case C_TPDEF:
      SF_SET_DEBUG (def_symbol_in_progress);
      S_SET_SEGMENT (def_symbol_in_progress, SEG_DEBUG);
      break;

    case C_EFCN:
      SF_SET_LOCAL (def_symbol_in_progress);	/* Do not emit this symbol. */
      /* intentional fallthrough */
    case C_BLOCK:
      SF_SET_PROCESS (def_symbol_in_progress);	/* Will need processing before writing */
      /* intentional fallthrough */
    case C_FCN:
      S_SET_SEGMENT (def_symbol_in_progress, SEG_E0);

      if (strcmp (S_GET_NAME (def_symbol_in_progress), ".bf") == 0)
	{			/* .bf */
	  if (function_lineoff < 0)
	    {
	      fprintf (stderr, "`.bf' symbol without preceding function\n");
	    }			/* missing function symbol */
	  SA_GET_SYM_LNNOPTR (last_line_symbol) = function_lineoff;

	  SF_SET_PROCESS (last_line_symbol);
	  function_lineoff = -1;
	}
      break;

#ifdef C_AUTOARG
    case C_AUTOARG:
#endif /* C_AUTOARG */
    case C_AUTO:
    case C_REG:
    case C_MOS:
    case C_MOE:
    case C_MOU:
    case C_ARG:
    case C_REGPARM:
    case C_FIELD:
    case C_EOS:
      SF_SET_DEBUG (def_symbol_in_progress);
      S_SET_SEGMENT (def_symbol_in_progress, SEG_ABSOLUTE);
      break;

    case C_EXT:
    case C_STAT:
    case C_LABEL:
      /* Valid but set somewhere else (s_comm, s_lcomm, colon) */
      break;

    case C_USTATIC:
    case C_EXTDEF:
    case C_ULABEL:
      as_warn ("unexpected storage class %d", S_GET_STORAGE_CLASS (def_symbol_in_progress));
      break;
    }				/* switch on storage class */

  /* Now that we have built a debug symbol, try to find if we should
     merge with an existing symbol or not.  If a symbol is C_EFCN or
     SEG_ABSOLUTE or untagged SEG_DEBUG it never merges.  We also
     don't merge labels, which are in a different namespace, nor
     symbols which have not yet been defined since they are typically
     unique, nor do we merge tags with non-tags.  */

  /* Two cases for functions.  Either debug followed by definition or
     definition followed by debug.  For definition first, we will
     merge the debug symbol into the definition.  For debug first, the
     lineno entry MUST point to the definition function or else it
     will point off into space when crawl_symbols() merges the debug
     symbol into the real symbol.  Therefor, let's presume the debug
     symbol is a real function reference. */

  /* FIXME-SOON If for some reason the definition label/symbol is
     never seen, this will probably leave an undefined symbol at link
     time. */

  if (S_GET_STORAGE_CLASS (def_symbol_in_progress) == C_EFCN
      || S_GET_STORAGE_CLASS (def_symbol_in_progress) == C_LABEL
      || (S_GET_SEGMENT (def_symbol_in_progress) == SEG_DEBUG
	  && !SF_GET_TAG (def_symbol_in_progress))
      || S_GET_SEGMENT (def_symbol_in_progress) == SEG_ABSOLUTE
      || def_symbol_in_progress->sy_value.X_op != O_constant
      || (symbolP = symbol_find_base (S_GET_NAME (def_symbol_in_progress), DO_NOT_STRIP)) == NULL
      || (SF_GET_TAG (def_symbol_in_progress) != SF_GET_TAG (symbolP)))
    {
      symbol_append (def_symbol_in_progress, symbol_lastP, &symbol_rootP,
		     &symbol_lastP);
    }
  else
    {
      /* This symbol already exists, merge the newly created symbol
	 into the This is not mandatory. The linker can handle
	 duplicate symbols correctly. But I guess that it save a *lot*
	 of space if the assembly file defines a lot of
	 symbols. [loic] */

      /* The debug entry (def_symbol_in_progress) is merged into the
	 previous definition.  */

      c_symbol_merge (def_symbol_in_progress, symbolP);
      /* FIXME-SOON Should *def_symbol_in_progress be free'd? xoxorich. */
      def_symbol_in_progress = symbolP;

      if (SF_GET_FUNCTION (def_symbol_in_progress)
	  || SF_GET_TAG (def_symbol_in_progress))
	{
	  /* For functions, and tags, the symbol *must* be where the
	     debug symbol appears.  Move the existing symbol to the
	     current place. */
	  /* If it already is at the end of the symbol list, do nothing */
	  if (def_symbol_in_progress != symbol_lastP)
	    {
	      symbol_remove (def_symbol_in_progress, &symbol_rootP,
			     &symbol_lastP);
	      symbol_append (def_symbol_in_progress, symbol_lastP,
			     &symbol_rootP, &symbol_lastP);
	    }			/* if not already in place */
	}			/* if function */
    }				/* normal or mergable */

  if (SF_GET_TAG (def_symbol_in_progress)
      && symbol_find_base (S_GET_NAME (def_symbol_in_progress), DO_NOT_STRIP) == NULL)
    {
      tag_insert (S_GET_NAME (def_symbol_in_progress), def_symbol_in_progress);
    }

  if (SF_GET_FUNCTION (def_symbol_in_progress))
    {
      know (sizeof (def_symbol_in_progress) <= sizeof (long));
      function_lineoff
	= c_line_new (def_symbol_in_progress, 0, 0, &zero_address_frag);

      SF_SET_PROCESS (def_symbol_in_progress);

      if (symbolP == NULL)
	{
	  /* That is, if this is the first time we've seen the
	     function... */
	  symbol_table_insert (def_symbol_in_progress);
	}			/* definition follows debug */
    }				/* Create the line number entry pointing to the function being defined */

  def_symbol_in_progress = NULL;
  demand_empty_rest_of_line ();
  return;
}

static void
obj_coff_dim (ignore)
     int ignore;
{
  register int dim_index;

  if (def_symbol_in_progress == NULL)
    {
      as_warn (".dim pseudo-op used outside of .def/.endef: ignored.");
      demand_empty_rest_of_line ();
      return;
    }				/* if not inside .def/.endef */

  S_SET_NUMBER_AUXILIARY (def_symbol_in_progress, 1);

  for (dim_index = 0; dim_index < DIMNUM; dim_index++)
    {
      SKIP_WHITESPACES ();
      SA_SET_SYM_DIMEN (def_symbol_in_progress, dim_index, get_absolute_expression ());

      switch (*input_line_pointer)
	{

	case ',':
	  input_line_pointer++;
	  break;

	default:
	  as_warn ("badly formed .dim directive ignored");
	  /* intentional fallthrough */
	case '\n':
	case ';':
	  dim_index = DIMNUM;
	  break;
	}			/* switch on following character */
    }				/* for each dimension */

  demand_empty_rest_of_line ();
  return;
}				/* obj_coff_dim() */

static void
obj_coff_line (ignore)
     int ignore;
{
  int this_base;

  if (def_symbol_in_progress == NULL)
    {
      obj_coff_ln (0);
      return;
    }				/* if it looks like a stabs style line */

  this_base = get_absolute_expression ();
  if (this_base > line_base)
    {
      line_base = this_base;
    }


#ifndef NO_LISTING
  {
    extern int listing;
    if (listing && 0)
      {
	listing_source_line ((unsigned int) line_base);
      }
  }
#endif
  S_SET_NUMBER_AUXILIARY (def_symbol_in_progress, 1);
  SA_SET_SYM_LNNO (def_symbol_in_progress, line_base);

  demand_empty_rest_of_line ();
  return;
}				/* obj_coff_line() */

static void
obj_coff_size (ignore)
     int ignore;
{
  if (def_symbol_in_progress == NULL)
    {
      as_warn (".size pseudo-op used outside of .def/.endef ignored.");
      demand_empty_rest_of_line ();
      return;
    }				/* if not inside .def/.endef */

  S_SET_NUMBER_AUXILIARY (def_symbol_in_progress, 1);
  SA_SET_SYM_SIZE (def_symbol_in_progress, get_absolute_expression ());
  demand_empty_rest_of_line ();
  return;
}				/* obj_coff_size() */

static void
obj_coff_scl (ignore)
     int ignore;
{
  if (def_symbol_in_progress == NULL)
    {
      as_warn (".scl pseudo-op used outside of .def/.endef ignored.");
      demand_empty_rest_of_line ();
      return;
    }				/* if not inside .def/.endef */

  S_SET_STORAGE_CLASS (def_symbol_in_progress, get_absolute_expression ());
  demand_empty_rest_of_line ();
  return;
}				/* obj_coff_scl() */

static void
obj_coff_tag (ignore)
     int ignore;
{
  char *symbol_name;
  char name_end;

  if (def_symbol_in_progress == NULL)
    {
      as_warn (".tag pseudo-op used outside of .def/.endef ignored.");
      demand_empty_rest_of_line ();
      return;
    }				/* if not inside .def/.endef */

  S_SET_NUMBER_AUXILIARY (def_symbol_in_progress, 1);
  symbol_name = input_line_pointer;
  name_end = get_symbol_end ();

  /* Assume that the symbol referred to by .tag is always defined. */
  /* This was a bad assumption.  I've added find_or_make. xoxorich. */
  SA_SET_SYM_TAGNDX (def_symbol_in_progress, (long) tag_find_or_make (symbol_name));
  if (SA_GET_SYM_TAGNDX (def_symbol_in_progress) == 0L)
    {
      as_warn ("tag not found for .tag %s", symbol_name);
    }				/* not defined */

  SF_SET_TAGGED (def_symbol_in_progress);
  *input_line_pointer = name_end;

  demand_empty_rest_of_line ();
  return;
}				/* obj_coff_tag() */

static void
obj_coff_type (ignore)
     int ignore;
{
  if (def_symbol_in_progress == NULL)
    {
      as_warn (".type pseudo-op used outside of .def/.endef ignored.");
      demand_empty_rest_of_line ();
      return;
    }				/* if not inside .def/.endef */

  S_SET_DATA_TYPE (def_symbol_in_progress, get_absolute_expression ());

  if (ISFCN (S_GET_DATA_TYPE (def_symbol_in_progress)) &&
      S_GET_STORAGE_CLASS (def_symbol_in_progress) != C_TPDEF)
    {
      SF_SET_FUNCTION (def_symbol_in_progress);
    }				/* is a function */

  demand_empty_rest_of_line ();
  return;
}				/* obj_coff_type() */

static void
obj_coff_val (ignore)
     int ignore;
{
  if (def_symbol_in_progress == NULL)
    {
      as_warn (".val pseudo-op used outside of .def/.endef ignored.");
      demand_empty_rest_of_line ();
      return;
    }				/* if not inside .def/.endef */

  if (is_name_beginner (*input_line_pointer))
    {
      char *symbol_name = input_line_pointer;
      char name_end = get_symbol_end ();

      if (!strcmp (symbol_name, "."))
	{
	  def_symbol_in_progress->sy_frag = frag_now;
	  S_SET_VALUE (def_symbol_in_progress, (valueT) frag_now_fix ());
	  /* If the .val is != from the .def (e.g. statics) */
	}
      else if (strcmp (S_GET_NAME (def_symbol_in_progress), symbol_name))
	{
	  def_symbol_in_progress->sy_value.X_op = O_symbol;
	  def_symbol_in_progress->sy_value.X_add_symbol =
	    symbol_find_or_make (symbol_name);
	  def_symbol_in_progress->sy_value.X_op_symbol = NULL;
	  def_symbol_in_progress->sy_value.X_add_number = 0;

	  /* If the segment is undefined when the forward reference is
	     resolved, then copy the segment id from the forward
	     symbol.  */
	  SF_SET_GET_SEGMENT (def_symbol_in_progress);

	  /* FIXME: gcc can generate address expressions
	     here in unusual cases (search for "obscure"
	     in sdbout.c).  We just ignore the offset
	     here, thus generating incorrect debugging
	     information.  We ignore the rest of the
	     line just below.  */
	}
      /* Otherwise, it is the name of a non debug symbol and
	 its value will be calculated later. */
      *input_line_pointer = name_end;

      /* FIXME: this is to avoid an error message in the
	 FIXME case mentioned just above.  */
      while (! is_end_of_line[(unsigned char) *input_line_pointer])
	++input_line_pointer;
    }
  else
    {
      S_SET_VALUE (def_symbol_in_progress,
		   (valueT) get_absolute_expression ());
    }				/* if symbol based */

  demand_empty_rest_of_line ();
  return;
}				/* obj_coff_val() */

/*
 * Maintain a list of the tagnames of the structres.
 */

static void
tag_init ()
{
  tag_hash = hash_new ();
  return;
}				/* tag_init() */

static void
tag_insert (name, symbolP)
     char *name;
     symbolS *symbolP;
{
  register const char *error_string;

  if (*(error_string = hash_jam (tag_hash, name, (char *) symbolP)))
    {
      as_fatal ("Inserting \"%s\" into structure table failed: %s",
		name, error_string);
    }
  return;
}				/* tag_insert() */

static symbolS *
tag_find_or_make (name)
     char *name;
{
  symbolS *symbolP;

  if ((symbolP = tag_find (name)) == NULL)
    {
      symbolP = symbol_new (name,
			    SEG_UNKNOWN,
			    0,
			    &zero_address_frag);

      tag_insert (S_GET_NAME (symbolP), symbolP);
    }				/* not found */

  return (symbolP);
}				/* tag_find_or_make() */

static symbolS *
tag_find (name)
     char *name;
{
#ifdef STRIP_UNDERSCORE
  if (*name == '_')
    name++;
#endif /* STRIP_UNDERSCORE */
  return ((symbolS *) hash_find (tag_hash, name));
}				/* tag_find() */

void
obj_read_begin_hook ()
{
  /* These had better be the same.  Usually 18 bytes. */
#ifndef BFD_HEADERS
  know (sizeof (SYMENT) == sizeof (AUXENT));
  know (SYMESZ == AUXESZ);
#endif
  tag_init ();

  return;
}				/* obj_read_begin_hook() */

/* This function runs through the symbol table and puts all the
   externals onto another chain */

/* The chain of externals */
symbolS *symbol_externP = NULL;
symbolS *symbol_extern_lastP = NULL;

stack *block_stack;
symbolS *last_functionP = NULL;
symbolS *last_tagP;

static unsigned int
DEFUN_VOID (yank_symbols)
{
  symbolS *symbolP;
  unsigned int symbol_number = 0;
  unsigned int last_file_symno = 0;

  for (symbolP = symbol_rootP;
       symbolP;
       symbolP = symbolP ? symbol_next (symbolP) : symbol_rootP)
    {
      if (!SF_GET_DEBUG (symbolP))
	{
	  /* Debug symbols do not need all this rubbish */
	  symbolS *real_symbolP;

	  /* L* and C_EFCN symbols never merge. */
	  if (!SF_GET_LOCAL (symbolP)
	      && S_GET_STORAGE_CLASS (symbolP) != C_LABEL
	      && symbolP->sy_value.X_op == O_constant
	      && (real_symbolP = symbol_find_base (S_GET_NAME (symbolP), DO_NOT_STRIP))
	      && real_symbolP != symbolP)
	    {
	      /* FIXME-SOON: where do dups come from?
		 Maybe tag references before definitions? xoxorich. */
	      /* Move the debug data from the debug symbol to the
		 real symbol. Do NOT do the oposite (i.e. move from
		 real symbol to debug symbol and remove real symbol from the
		 list.) Because some pointers refer to the real symbol
		 whereas no pointers refer to the debug symbol. */
	      c_symbol_merge (symbolP, real_symbolP);
	      /* Replace the current symbol by the real one */
	      /* The symbols will never be the last or the first
		 because : 1st symbol is .file and 3 last symbols are
		 .text, .data, .bss */
	      symbol_remove (real_symbolP, &symbol_rootP, &symbol_lastP);
	      symbol_insert (real_symbolP, symbolP, &symbol_rootP, &symbol_lastP);
	      symbol_remove (symbolP, &symbol_rootP, &symbol_lastP);
	      symbolP = real_symbolP;
	    }			/* if not local but dup'd */

	  if (flagseen['R'] && (S_GET_SEGMENT (symbolP) == SEG_E1))
	    {
	      S_SET_SEGMENT (symbolP, SEG_E0);
	    }			/* push data into text */

	  resolve_symbol_value (symbolP);

	  if (!S_IS_DEFINED (symbolP) && !SF_GET_LOCAL (symbolP))
	    {
	      S_SET_EXTERNAL (symbolP);
	    }
	  else if (S_GET_STORAGE_CLASS (symbolP) == C_NULL)
	    {
	      if (S_GET_SEGMENT (symbolP) == SEG_E0)
		{
		  S_SET_STORAGE_CLASS (symbolP, C_LABEL);
		}
	      else
		{
		  S_SET_STORAGE_CLASS (symbolP, C_STAT);
		}
	    }

	  /* Mainly to speed up if not -g */
	  if (SF_GET_PROCESS (symbolP))
	    {
	      /* Handle the nested blocks auxiliary info. */
	      if (S_GET_STORAGE_CLASS (symbolP) == C_BLOCK)
		{
		  if (!strcmp (S_GET_NAME (symbolP), ".bb"))
		    stack_push (block_stack, (char *) &symbolP);
		  else
		    {		/* .eb */
		      register symbolS *begin_symbolP;
		      begin_symbolP = *(symbolS **) stack_pop (block_stack);
		      if (begin_symbolP == (symbolS *) 0)
			as_warn ("mismatched .eb");
		      else
			SA_SET_SYM_ENDNDX (begin_symbolP, symbol_number + 2);
		    }
		}
	      /* If we are able to identify the type of a function, and we
	       are out of a function (last_functionP == 0) then, the
	       function symbol will be associated with an auxiliary
	       entry. */
	      if (last_functionP == (symbolS *) 0 &&
		  SF_GET_FUNCTION (symbolP))
		{
		  last_functionP = symbolP;

		  if (S_GET_NUMBER_AUXILIARY (symbolP) < 1)
		    {
		      S_SET_NUMBER_AUXILIARY (symbolP, 1);
		    }		/* make it at least 1 */

		  /* Clobber possible stale .dim information. */
#if 0
		  /* Iffed out by steve - this fries the lnnoptr info too */
		  bzero (symbolP->sy_symbol.ost_auxent[0].x_sym.x_fcnary.x_ary.x_dimen,
			 sizeof (symbolP->sy_symbol.ost_auxent[0].x_sym.x_fcnary.x_ary.x_dimen));
#endif
		}
	      /* The C_FCN doesn't need any additional information.  I
		 don't even know if this is needed for sdb. But the
		 standard assembler generates it, so...  */
	      if (S_GET_STORAGE_CLASS (symbolP) == C_EFCN)
		{
		  if (last_functionP == (symbolS *) 0)
		    as_fatal ("C_EFCN symbol out of scope");
		  SA_SET_SYM_FSIZE (last_functionP,
				    (long) (S_GET_VALUE (symbolP) -
					    S_GET_VALUE (last_functionP)));
		  SA_SET_SYM_ENDNDX (last_functionP, symbol_number);
		  last_functionP = (symbolS *) 0;
		}
	    }
	}
      else if (SF_GET_TAG (symbolP))
	{
	  /* First descriptor of a structure must point to
	       the first slot after the structure description. */
	  last_tagP = symbolP;

	}
      else if (S_GET_STORAGE_CLASS (symbolP) == C_EOS)
	{
	  /* +2 take in account the current symbol */
	  SA_SET_SYM_ENDNDX (last_tagP, symbol_number + 2);
	}
      else if (S_GET_STORAGE_CLASS (symbolP) == C_FILE)
	{
	  if (S_GET_VALUE (symbolP))
	    {
	      S_SET_VALUE (symbolP, last_file_symno);
	      last_file_symno = symbol_number;
	    }			/* no one points at the first .file symbol */
	}			/* if debug or tag or eos or file */

      /* We must put the external symbols apart. The loader
	 does not bomb if we do not. But the references in
	 the endndx field for a .bb symbol are not corrected
	 if an external symbol is removed between .bb and .be.
	 I.e in the following case :
	 [20] .bb endndx = 22
	 [21] foo external
	 [22] .be
	 ld will move the symbol 21 to the end of the list but
	 endndx will still be 22 instead of 21. */


      if (SF_GET_LOCAL (symbolP))
	{
	  /* remove C_EFCN and LOCAL (L...) symbols */
	  /* next pointer remains valid */
	  symbol_remove (symbolP, &symbol_rootP, &symbol_lastP);

	}
      else if (!S_IS_DEFINED (symbolP)
	       && !S_IS_DEBUG (symbolP)
	       && !SF_GET_STATICS (symbolP) &&
	       S_GET_STORAGE_CLASS (symbolP) == C_EXT)
	{			/* C_EXT && !SF_GET_FUNCTION(symbolP))  */
	  /* if external, Remove from the list */
	  symbolS *hold = symbol_previous (symbolP);

	  symbol_remove (symbolP, &symbol_rootP, &symbol_lastP);
	  symbol_clear_list_pointers (symbolP);
	  symbol_append (symbolP, symbol_extern_lastP, &symbol_externP, &symbol_extern_lastP);
	  symbolP = hold;
	}
      else
	{
	  if (SF_GET_STRING (symbolP))
	    {
	      symbolP->sy_name_offset = string_byte_count;
	      string_byte_count += strlen (S_GET_NAME (symbolP)) + 1;
	    }
	  else
	    {
	      symbolP->sy_name_offset = 0;
	    }			/* fix "long" names */

	  symbolP->sy_number = symbol_number;
	  symbol_number += 1 + S_GET_NUMBER_AUXILIARY (symbolP);
	}			/* if local symbol */
    }				/* traverse the symbol list */
  return symbol_number;

}


static unsigned int
DEFUN_VOID (glue_symbols)
{
  unsigned int symbol_number = 0;
  symbolS *symbolP;
  for (symbolP = symbol_externP; symbol_externP;)
    {
      symbolS *tmp = symbol_externP;

      /* append */
      symbol_remove (tmp, &symbol_externP, &symbol_extern_lastP);
      symbol_append (tmp, symbol_lastP, &symbol_rootP, &symbol_lastP);

      /* and process */
      if (SF_GET_STRING (tmp))
	{
	  tmp->sy_name_offset = string_byte_count;
	  string_byte_count += strlen (S_GET_NAME (tmp)) + 1;
	}
      else
	{
	  tmp->sy_name_offset = 0;
	}			/* fix "long" names */

      tmp->sy_number = symbol_number;
      symbol_number += 1 + S_GET_NUMBER_AUXILIARY (tmp);
    }				/* append the entire extern chain */
  return symbol_number;

}

static unsigned int
DEFUN_VOID (tie_tags)
{
  unsigned int symbol_number = 0;

  symbolS *symbolP;
  for (symbolP = symbol_rootP; symbolP; symbolP =
       symbol_next (symbolP))
    {
      symbolP->sy_number = symbol_number;



      if (SF_GET_TAGGED (symbolP))
	{
	  SA_SET_SYM_TAGNDX
	    (symbolP,
	     ((symbolS *) SA_GET_SYM_TAGNDX (symbolP))->sy_number);
	}

      symbol_number += 1 + S_GET_NUMBER_AUXILIARY (symbolP);
    }
  return symbol_number;

}

static void
DEFUN (crawl_symbols, (h, abfd),
       object_headers *h AND
       bfd * abfd)
{
  unsigned int i;

  /* Initialize the stack used to keep track of the matching .bb .be */

  block_stack = stack_init (512, sizeof (symbolS *));

  /* The symbol list should be ordered according to the following sequence
   * order :
   * . .file symbol
   * . debug entries for functions
   * . fake symbols for the sections, including.text .data and .bss
   * . defined symbols
   * . undefined symbols
   * But this is not mandatory. The only important point is to put the
   * undefined symbols at the end of the list.
   */

  if (symbol_rootP == NULL
      || S_GET_STORAGE_CLASS (symbol_rootP) != C_FILE)
    {
      c_dot_file_symbol ("fake");
    }
  /* Is there a .file symbol ? If not insert one at the beginning. */

  /*
   * Build up static symbols for the sections, they are filled in later
   */


  for (i = SEG_E0; i < SEG_E9; i++)
    {
      if (segment_info[i].scnhdr.s_name[0])
	{
	  char name[9];

	  strncpy (name, segment_info[i].scnhdr.s_name, 8);
	  name[8] = '\0';
	  segment_info[i].dot = c_section_symbol (name, i - SEG_E0 + 1);
	}
    }


  /* Take all the externals out and put them into another chain */
  H_SET_SYMBOL_TABLE_SIZE (h, yank_symbols ());
  /* Take the externals and glue them onto the end.*/
  H_SET_SYMBOL_TABLE_SIZE (h, H_GET_SYMBOL_COUNT (h) + glue_symbols ());

  H_SET_SYMBOL_TABLE_SIZE (h, tie_tags ());
  know (symbol_externP == NULL);
  know (symbol_extern_lastP == NULL);

  return;
}

/*
 * Find strings by crawling along symbol table chain.
 */

void
DEFUN (w_strings, (where),
       char *where)
{
  symbolS *symbolP;

  /* Gotta do md_ byte-ordering stuff for string_byte_count first - KWK */
  md_number_to_chars (where, (valueT) string_byte_count, 4);
  where += 4;
  for (symbolP = symbol_rootP;
       symbolP;
       symbolP = symbol_next (symbolP))
    {
      unsigned int size;

      if (SF_GET_STRING (symbolP))
	{
	  size = strlen (S_GET_NAME (symbolP)) + 1;

	  memcpy (where, S_GET_NAME (symbolP), size);
	  where += size;

	}
    }

}

static void
DEFUN (do_linenos_for, (abfd, h, file_cursor),
       bfd * abfd AND
       object_headers * h AND
       unsigned long *file_cursor)
{
  unsigned int idx;
  unsigned long start = *file_cursor;

  for (idx = SEG_E0; idx < SEG_E9; idx++)
    {
      segment_info_type *s = segment_info + idx;


      if (s->scnhdr.s_nlnno != 0)
	{
	  struct lineno_list *line_ptr;

	  struct external_lineno *buffer =
	  (struct external_lineno *) xmalloc (s->scnhdr.s_nlnno * LINESZ);

	  struct external_lineno *dst = buffer;

	  /* Run through the table we've built and turn it into its external
	 form, take this chance to remove duplicates */

	  for (line_ptr = s->lineno_list_head;
	       line_ptr != (struct lineno_list *) NULL;
	       line_ptr = line_ptr->next)
	    {

	      if (line_ptr->line.l_lnno == 0)
		{
		  /* Turn a pointer to a symbol into the symbols' index */
		  line_ptr->line.l_addr.l_symndx =
		    ((symbolS *) line_ptr->line.l_addr.l_symndx)->sy_number;
		}
	      else
		{
		  line_ptr->line.l_addr.l_paddr += ((struct frag *) (line_ptr->frag))->fr_address;
		}


	      (void) bfd_coff_swap_lineno_out (abfd, &(line_ptr->line), dst);
	      dst++;

	    }

	  s->scnhdr.s_lnnoptr = *file_cursor;

	  bfd_write (buffer, 1, s->scnhdr.s_nlnno * LINESZ, abfd);
	  free (buffer);

	  *file_cursor += s->scnhdr.s_nlnno * LINESZ;
	}
    }
  H_SET_LINENO_SIZE (h, *file_cursor - start);
}


/* Now we run through the list of frag chains in a segment and
   make all the subsegment frags appear at the end of the
   list, as if the seg 0 was extra long */

static void
DEFUN_VOID (remove_subsegs)
{
  unsigned int i;

  for (i = SEG_E0; i < SEG_UNKNOWN; i++)
    {
      frchainS *head = segment_info[i].frchainP;
      fragS dummy;
      fragS *prev_frag = &dummy;

      while (head && head->frch_seg == i)
	{
	  prev_frag->fr_next = head->frch_root;
	  prev_frag = head->frch_last;
	  head = head->frch_next;
	}
      prev_frag->fr_next = 0;
    }
}

unsigned long machine;
int coff_flags;
extern void
DEFUN_VOID (write_object_file)
{
  int i;
  struct frchain *frchain_ptr;

  object_headers headers;
  unsigned long file_cursor;
  bfd *abfd;
  unsigned int addr;
  abfd = bfd_openw (out_file_name, TARGET_FORMAT);


  if (abfd == 0)
    {
      as_perror ("FATAL: Can't create %s", out_file_name);
      exit (42);
    }
  bfd_set_format (abfd, bfd_object);
  bfd_set_arch_mach (abfd, BFD_ARCH, machine);

  string_byte_count = 4;

  for (frchain_ptr = frchain_root;
       frchain_ptr != (struct frchain *) NULL;
       frchain_ptr = frchain_ptr->frch_next)
    {
      /* Run through all the sub-segments and align them up. Also close any
	       open frags. We tack a .fill onto the end of the frag chain so
	       that any .align's size can be worked by looking at the next
	       frag */

      subseg_set (frchain_ptr->frch_seg, frchain_ptr->frch_subseg);
#ifndef SUB_SEGMENT_ALIGN
#define SUB_SEGMENT_ALIGN(SEG) 1
#endif
      frag_align (SUB_SEGMENT_ALIGN (now_seg), NOP_OPCODE);
      frag_wane (frag_now);
      frag_now->fr_fix = 0;
      know (frag_now->fr_next == NULL);
    }


  remove_subsegs ();


  for (i = SEG_E0; i < SEG_UNKNOWN; i++)
    {
      relax_segment (segment_info[i].frchainP->frch_root, i);
    }

  H_SET_NUMBER_OF_SECTIONS (&headers, 0);

  /* Find out how big the sections are, and set the addresses.  */
  addr = 0;
  for (i = SEG_E0; i < SEG_UNKNOWN; i++)
    {
      long size;

      segment_info[i].scnhdr.s_paddr = addr;
      segment_info[i].scnhdr.s_vaddr = addr;

      if (segment_info[i].scnhdr.s_name[0])
	{
	  H_SET_NUMBER_OF_SECTIONS (&headers,
				    H_GET_NUMBER_OF_SECTIONS (&headers) + 1);
	}

      size = size_section (abfd, (unsigned int) i);
      addr += size;

      if (i == SEG_E0)
	H_SET_TEXT_SIZE (&headers, size);
      else if (i == SEG_E1)
	H_SET_DATA_SIZE (&headers, size);
      else if (i == SEG_E2)
	H_SET_BSS_SIZE (&headers, size);
    }

  /* Turn the gas native symbol table shape into a coff symbol table */
  crawl_symbols (&headers, abfd);

  if (string_byte_count == 4)
    string_byte_count = 0;

  H_SET_STRING_SIZE (&headers, string_byte_count);

#if !defined(TC_H8300) && !defined(TC_Z8K) 
  for (i = SEG_E0; i < SEG_UNKNOWN; i++)
    {
      fixup_mdeps (segment_info[i].frchainP->frch_root, &headers, i);
      fixup_segment (&segment_info[i], i);
    }
#endif

  file_cursor = H_GET_TEXT_FILE_OFFSET (&headers);

  bfd_seek (abfd, (file_ptr) file_cursor, 0);

  /* Plant the data */

  fill_section (abfd, &headers, &file_cursor);

  do_relocs_for (abfd, &headers, &file_cursor);

  do_linenos_for (abfd, &headers, &file_cursor);

  H_SET_FILE_MAGIC_NUMBER (&headers, COFF_MAGIC);
#ifndef OBJ_COFF_OMIT_TIMESTAMP
  H_SET_TIME_STAMP (&headers, (long)time((long*)0));
#else
  H_SET_TIME_STAMP (&headers, 0);
#endif

#ifdef KEEP_RELOC_INFO
  H_SET_FLAGS (&headers, ((H_GET_LINENO_SIZE(&headers) ? 0 : F_LNNO) |
			  COFF_FLAGS | coff_flags));
#else
  H_SET_FLAGS (&headers, ((H_GET_LINENO_SIZE(&headers)     ? 0 : F_LNNO)   |
			  (H_GET_RELOCATION_SIZE(&headers) ? 0 : F_RELFLG) |
			  COFF_FLAGS | coff_flags));
#endif	

  {
    unsigned int symtable_size = H_GET_SYMBOL_TABLE_SIZE (&headers);
    char *buffer1 = xmalloc (symtable_size + string_byte_count + 1);

    H_SET_SYMBOL_TABLE_POINTER (&headers, bfd_tell (abfd));
    w_symbols (abfd, buffer1, symbol_rootP);
    if (string_byte_count > 0)
      w_strings (buffer1 + symtable_size);
    bfd_write (buffer1, 1, symtable_size + string_byte_count, abfd);
    free (buffer1);
  }

  coff_header_append (abfd, &headers);

  if (bfd_close_all_done (abfd) == false)
    as_fatal ("Can't close %s: %s", out_file_name,
	      bfd_errmsg (bfd_error));
}

/* Add a new segment.  This is called from subseg_new via the
   obj_new_segment macro.  */

segT
obj_coff_add_segment (name)
     const char *name;
{
  unsigned int len;
  unsigned int i;

  /* Find out if we've already got a section of this name.  */
  len = strlen (name);
  if (len < sizeof (segment_info[i].scnhdr.s_name))
    ++len;
  else
    len = sizeof (segment_info[i].scnhdr.s_name);
  for (i = SEG_E0; i < SEG_E9 && segment_info[i].scnhdr.s_name[0]; i++)
    if (strncmp (segment_info[i].scnhdr.s_name, name, len) == 0
	&& (len == sizeof (segment_info[i].scnhdr.s_name)
	    || segment_info[i].scnhdr.s_name[len] == '\0'))
      return (segT) i;

  if (i == SEG_E9)
    {
      as_bad ("Too many new sections; can't add \"%s\"", name);
      return now_seg;
    }

  /* Add a new section.  */
  strncpy (segment_info[i].scnhdr.s_name, name,
	   sizeof (segment_info[i].scnhdr.s_name));
  segment_info[i].scnhdr.s_flags = STYP_REG;

  return (segT) i;
}

/*
 * implement the .section pseudo op:
 *	.section name {, "flags"}
 *                ^         ^
 *                |         +--- optional flags: 'b' for bss
 *                |                              'i' for info
 *                +-- section name               'l' for lib
 *                                               'n' for noload
 *                                               'o' for over
 *                                               'w' for data
 *						 'd' (apparently m88k for data)
 *                                               'x' for text
 * But if the argument is not a quoted string, treat it as a
 * subsegment number.
 */

void
obj_coff_section (ignore)
     int ignore;
{
  /* Strip out the section name */
  char *section_name;
  char *section_name_end;
  char c;
  int argp;
  unsigned int len;
  unsigned int exp;
  long flags;

  section_name = input_line_pointer;
  c = get_symbol_end ();
  section_name_end = input_line_pointer;

  len = section_name_end - section_name;
  input_line_pointer++;
  SKIP_WHITESPACE ();

  argp = 0;
  if (c == ',')
    argp = 1;
  else if (*input_line_pointer == ',')
    {
      argp = 1;
      ++input_line_pointer;
      SKIP_WHITESPACE ();
    }

  exp = 0;
  flags = 0;
  if (argp)
    {
      if (*input_line_pointer != '"')
	exp = get_absolute_expression ();
      else
	{
	  ++input_line_pointer;
	  while (*input_line_pointer != '"'
		 && ! is_end_of_line[(unsigned char) *input_line_pointer])
	    {
	      switch (*input_line_pointer)
		{
		case 'b': flags |= STYP_BSS;    break;
		case 'i': flags |= STYP_INFO;   break;
		case 'l': flags |= STYP_LIB;    break;
		case 'n': flags |= STYP_NOLOAD; break;
		case 'o': flags |= STYP_OVER;   break;
		case 'd':
		case 'w': flags |= STYP_DATA;   break;
		case 'x': flags |= STYP_TEXT;   break;
		default:
		  as_warn("unknown section attribute '%c'",
			  *input_line_pointer);
		  break;
		}
	      ++input_line_pointer;
	    }
	  if (*input_line_pointer == '"')
	    ++input_line_pointer;
	}
    }

  subseg_new (section_name, (subsegT) exp);

  segment_info[now_seg].scnhdr.s_flags |= flags;

  *section_name_end = c;
}


static void
obj_coff_text (ignore)
     int ignore;
{
  subseg_new (".text", get_absolute_expression ());
}


static void
obj_coff_data (ignore)
     int ignore;
{
  if (flagseen['R'])
    subseg_new (".text", get_absolute_expression () + 1000);
  else
    subseg_new (".data", get_absolute_expression ());
}

static void
obj_coff_bss (ignore)
     int ignore;
{
  if (*input_line_pointer == '\n')	/* .bss 		*/
    subseg_new(".bss", get_absolute_expression());
  else					/* .bss id,expr		*/
    obj_coff_lcomm(0);
}

static void
obj_coff_ident (ignore)
     int ignore;
{
  segT current_seg = now_seg;		/* save current seg	*/
  subsegT current_subseg = now_subseg;
  subseg_new (".comment", 0);		/* .comment seg		*/
  stringer (1);				/* read string		*/
  subseg_set (current_seg, current_subseg);	/* restore current seg	*/
}

void
c_symbol_merge (debug, normal)
     symbolS *debug;
     symbolS *normal;
{
  S_SET_DATA_TYPE (normal, S_GET_DATA_TYPE (debug));
  S_SET_STORAGE_CLASS (normal, S_GET_STORAGE_CLASS (debug));

  if (S_GET_NUMBER_AUXILIARY (debug) > S_GET_NUMBER_AUXILIARY (normal))
    {
      S_SET_NUMBER_AUXILIARY (normal, S_GET_NUMBER_AUXILIARY (debug));
    }				/* take the most we have */

  if (S_GET_NUMBER_AUXILIARY (debug) > 0)
    {
      memcpy ((char *) &normal->sy_symbol.ost_auxent[0],
	      (char *) &debug->sy_symbol.ost_auxent[0],
	      (unsigned int) (S_GET_NUMBER_AUXILIARY (debug) * AUXESZ));
    }				/* Move all the auxiliary information */

  /* Move the debug flags. */
  SF_SET_DEBUG_FIELD (normal, SF_GET_DEBUG_FIELD (debug));
}				/* c_symbol_merge() */

static int
DEFUN (c_line_new, (symbol, paddr, line_number, frag),
       symbolS * symbol AND
       long paddr AND
       unsigned short line_number AND
       fragS * frag)
{
  struct lineno_list *new_line =
  (struct lineno_list *) xmalloc (sizeof (struct lineno_list));

  segment_info_type *s = segment_info + now_seg;
  new_line->line.l_lnno = line_number;

  if (line_number == 0)
    {
      last_line_symbol = symbol;
      new_line->line.l_addr.l_symndx = (long) symbol;
    }
  else
    {
      new_line->line.l_addr.l_paddr = paddr;
    }

  new_line->frag = (char *) frag;
  new_line->next = (struct lineno_list *) NULL;


  if (s->lineno_list_head == (struct lineno_list *) NULL)
    {
      s->lineno_list_head = new_line;
    }
  else
    {
      s->lineno_list_tail->next = new_line;
    }
  s->lineno_list_tail = new_line;
  return LINESZ * s->scnhdr.s_nlnno++;
}

void
c_dot_file_symbol (filename)
     char *filename;
{
  symbolS *symbolP;

  symbolP = symbol_new (".file",
			SEG_DEBUG,
			0,
			&zero_address_frag);

  S_SET_STORAGE_CLASS (symbolP, C_FILE);
  S_SET_NUMBER_AUXILIARY (symbolP, 1);
  SA_SET_FILE_FNAME (symbolP, filename);
#ifndef NO_LISTING
  {
    extern int listing;
    if (listing)
      {
	listing_source_file (filename);
      }

  }

#endif
  SF_SET_DEBUG (symbolP);
  S_SET_VALUE (symbolP, (valueT) previous_file_symbol);

  previous_file_symbol = symbolP;

  /* Make sure that the symbol is first on the symbol chain */
  if (symbol_rootP != symbolP)
    {
      if (symbolP == symbol_lastP)
	{
	  symbol_lastP = symbol_lastP->sy_previous;
	}			/* if it was the last thing on the list */

      symbol_remove (symbolP, &symbol_rootP, &symbol_lastP);
      symbol_insert (symbolP, symbol_rootP, &symbol_rootP, &symbol_lastP);
      symbol_rootP = symbolP;
    }				/* if not first on the list */

}				/* c_dot_file_symbol() */

/*
 * Build a 'section static' symbol.
 */

symbolS *
c_section_symbol (name, idx)
     char *name;
     int idx;
{
  symbolS *symbolP;

  symbolP = symbol_new (name, idx,
			0,
			&zero_address_frag);

  S_SET_STORAGE_CLASS (symbolP, C_STAT);
  S_SET_NUMBER_AUXILIARY (symbolP, 1);

  SF_SET_STATICS (symbolP);

  return symbolP;
}				/* c_section_symbol() */

static void
DEFUN (w_symbols, (abfd, where, symbol_rootP),
       bfd * abfd AND
       char *where AND
       symbolS * symbol_rootP)
{
  symbolS *symbolP;
  unsigned int i;

  /* First fill in those values we have only just worked out */
  for (i = SEG_E0; i < SEG_E9; i++)
    {
      symbolP = segment_info[i].dot;
      if (symbolP)
	{

	  SA_SET_SCN_SCNLEN (symbolP, segment_info[i].scnhdr.s_size);
	  SA_SET_SCN_NRELOC (symbolP, segment_info[i].scnhdr.s_nreloc);
	  SA_SET_SCN_NLINNO (symbolP, segment_info[i].scnhdr.s_nlnno);

	}
    }

  /*
     * Emit all symbols left in the symbol chain.
     */
  for (symbolP = symbol_rootP; symbolP; symbolP = symbol_next (symbolP))
    {
      /* Used to save the offset of the name. It is used to point
	       to the string in memory but must be a file offset. */
      register char *temp;

      tc_coff_symbol_emit_hook (symbolP);

      temp = S_GET_NAME (symbolP);
      if (SF_GET_STRING (symbolP))
	{
	  S_SET_OFFSET (symbolP, symbolP->sy_name_offset);
	  S_SET_ZEROES (symbolP, 0);
	}
      else
	{
	  memset (symbolP->sy_symbol.ost_entry.n_name, 0, SYMNMLEN);
	  strncpy (symbolP->sy_symbol.ost_entry.n_name, temp, SYMNMLEN);
	}
      where = symbol_to_chars (abfd, where, symbolP);
      S_SET_NAME (symbolP, temp);
    }

}				/* w_symbols() */

static void
obj_coff_lcomm (ignore)
     int ignore;
{
  char *name;
  char c;
  int temp;
  char *p;

  symbolS *symbolP;
  name = input_line_pointer;

  c = get_symbol_end ();
  p = input_line_pointer;
  *p = c;
  SKIP_WHITESPACE ();
  if (*input_line_pointer != ',')
    {
      as_bad ("Expected comma after name");
      ignore_rest_of_line ();
      return;
    }
  if (*input_line_pointer == '\n')
    {
      as_bad ("Missing size expression");
      return;
    }
  input_line_pointer++;
  if ((temp = get_absolute_expression ()) < 0)
    {
      as_warn ("lcomm length (%d.) <0! Ignored.", temp);
      ignore_rest_of_line ();
      return;
    }
  *p = 0;

  symbolP = symbol_find_or_make(name);

  if (S_GET_SEGMENT(symbolP) == SEG_UNKNOWN &&
      S_GET_VALUE(symbolP) == 0)
    {
      if (! need_pass_2)
	{
	  char *p;
	  segT current_seg = now_seg; 	/* save current seg     */
	  subsegT current_subseg = now_subseg;

	  subseg_set (SEG_E2, 1);
	  symbolP->sy_frag = frag_now;
	  p = frag_var(rs_org, 1, 1, (relax_substateT)0, symbolP,
		       temp, (char *)0);
	  *p = 0;
	  subseg_set (current_seg, current_subseg); /* restore current seg */
	  S_SET_SEGMENT(symbolP, SEG_E2);
	  S_SET_STORAGE_CLASS(symbolP, C_STAT);
	}
    }
  else
    as_bad("Symbol %s already defined", name);

  demand_empty_rest_of_line();
}

static void
DEFUN (fixup_mdeps, (frags, h, this_segment),
       fragS * frags AND
       object_headers * h AND
       segT this_segment)
{
  subseg_change (this_segment, 0);
  while (frags)
    {
      switch (frags->fr_type)
	{
	case rs_align:
	case rs_org:
	  frags->fr_type = rs_fill;
	  frags->fr_offset =
	    (frags->fr_next->fr_address - frags->fr_address - frags->fr_fix);
	  break;
	case rs_machine_dependent:
	  md_convert_frag (h, frags);
	  frag_wane (frags);
	  break;
	default:
	  ;
	}
      frags = frags->fr_next;
    }
}

#if 1
static void
DEFUN (fixup_segment, (segP, this_segment_type),
       segment_info_type * segP AND
       segT this_segment_type)
{
  register fixS * fixP;
  register symbolS *add_symbolP;
  register symbolS *sub_symbolP;
  register long add_number;
  register int size;
  register char *place;
  register long where;
  register char pcrel;
  register fragS *fragP;
  register segT add_symbol_segment = SEG_ABSOLUTE;


  for (fixP = segP->fix_root; fixP; fixP = fixP->fx_next)
    {
      fragP = fixP->fx_frag;
      know (fragP);
      where = fixP->fx_where;
      place = fragP->fr_literal + where;
      size = fixP->fx_size;
      add_symbolP = fixP->fx_addsy;
#ifdef TC_I960
      if (fixP->fx_callj && TC_S_IS_CALLNAME (add_symbolP))
	{
	  /* Relocation should be done via the
		   associated 'bal' entry point
		   symbol. */

	  if (!TC_S_IS_BALNAME (tc_get_bal_of_call (add_symbolP)))
	    {
	      as_bad ("No 'bal' entry point for leafproc %s",
		      S_GET_NAME (add_symbolP));
	      continue;
	    }
	  fixP->fx_addsy = add_symbolP = tc_get_bal_of_call (add_symbolP);
	}			/* callj relocation */
#endif
      sub_symbolP = fixP->fx_subsy;
      add_number = fixP->fx_offset;
      pcrel = fixP->fx_pcrel;

      if (add_symbolP)
	{
	  add_symbol_segment = S_GET_SEGMENT (add_symbolP);
	}			/* if there is an addend */

      if (sub_symbolP)
	{
	  if (!add_symbolP)
	    {
	      /* Its just -sym */
	      if (S_GET_SEGMENT (sub_symbolP) != SEG_ABSOLUTE)
		{
		  as_bad ("Negative of non-absolute symbol %s", S_GET_NAME (sub_symbolP));
		}		/* not absolute */

	      add_number -= S_GET_VALUE (sub_symbolP);
	      fixP->fx_subsy = 0;

	      /* if sub_symbol is in the same segment that add_symbol
			   and add_symbol is either in DATA, TEXT, BSS or ABSOLUTE */
	    }
	  else if ((S_GET_SEGMENT (sub_symbolP) == add_symbol_segment)
		   && (SEG_NORMAL (add_symbol_segment)
		       || (add_symbol_segment == SEG_ABSOLUTE)))
	    {
	      /* Difference of 2 symbols from same segment. */
	      /* Can't make difference of 2 undefineds: 'value' means */
	      /* something different for N_UNDF. */
#ifdef TC_I960
	      /* Makes no sense to use the difference of 2 arbitrary symbols
	         as the target of a call instruction.  */
	      if (fixP->fx_callj)
		{
		  as_bad ("callj to difference of 2 symbols");
		}
#endif /* TC_I960 */
	      add_number += S_GET_VALUE (add_symbolP) -
		S_GET_VALUE (sub_symbolP);

	      add_symbolP = NULL;
	      fixP->fx_addsy = NULL;
	    }
	  else
	    {
	      /* Different segments in subtraction. */
	      know (!(S_IS_EXTERNAL (sub_symbolP) && (S_GET_SEGMENT (sub_symbolP) == SEG_ABSOLUTE)));

	      if ((S_GET_SEGMENT (sub_symbolP) == SEG_ABSOLUTE))
		{
		  add_number -= S_GET_VALUE (sub_symbolP);
		}
	      else
		{
		  as_bad ("Can't emit reloc {- %s-seg symbol \"%s\"} @ file address %ld.",
			  segment_name (S_GET_SEGMENT (sub_symbolP)),
			  S_GET_NAME (sub_symbolP),
			  (long) (fragP->fr_address + where));
		}		/* if absolute */
	    }
	}			/* if sub_symbolP */

      if (add_symbolP)
	{
	  if (add_symbol_segment == this_segment_type && pcrel)
	    {
	      /*
	       * This fixup was made when the symbol's segment was
	       * SEG_UNKNOWN, but it is now in the local segment.
	       * So we know how to do the address without relocation.
	       */
#ifdef TC_I960
	      /* reloc_callj() may replace a 'call' with a 'calls' or a 'bal',
	       * in which cases it modifies *fixP as appropriate.  In the case
	       * of a 'calls', no further work is required, and *fixP has been
	       * set up to make the rest of the code below a no-op.
	       */
	      reloc_callj (fixP);
#endif /* TC_I960 */

	      add_number += S_GET_VALUE (add_symbolP);
	      add_number -= md_pcrel_from (fixP);
#ifdef TC_I386
	      /* On the 386 we must adjust by the segment
		 vaddr as well.  Ian Taylor.  */
	      add_number -= segP->scnhdr.s_vaddr;
#endif
	      pcrel = 0;	/* Lie. Don't want further pcrel processing. */
	      fixP->fx_addsy = NULL;	/* No relocations please. */
	    }
	  else
	    {
	      switch (add_symbol_segment)
		{
		case SEG_ABSOLUTE:
#ifdef TC_I960
		  reloc_callj (fixP);	/* See comment about reloc_callj() above*/
#endif /* TC_I960 */
		  add_number += S_GET_VALUE (add_symbolP);
		  fixP->fx_addsy = NULL;
		  add_symbolP = NULL;
		  break;
		default:

#ifdef TC_A29K
		  /* This really should be handled in the linker, but
		     backward compatibility forbids.  */
		  add_number += S_GET_VALUE (add_symbolP);
#else
		  add_number += S_GET_VALUE (add_symbolP) +
		    segment_info[S_GET_SEGMENT (add_symbolP)].scnhdr.s_paddr;
#endif
		  break;

		case SEG_UNKNOWN:
#ifdef TC_I960
		  if ((int) fixP->fx_bit_fixP == 13)
		    {
		      /* This is a COBR instruction.  They have only a
		       * 13-bit displacement and are only to be used
		       * for local branches: flag as error, don't generate
		       * relocation.
		       */
		      as_bad ("can't use COBR format with external label");
		      fixP->fx_addsy = NULL;	/* No relocations please. */
		      continue;
		    }		/* COBR */
#endif /* TC_I960 */
#ifdef TC_I386
		  /* 386 COFF uses a peculiar format in
		     which the value of a common symbol is
		     stored in the .text segment (I've
		     checked this on SVR3.2 and SCO 3.2.2)
		     Ian Taylor <ian@cygnus.com>.  */
		  if (S_IS_COMMON (add_symbolP))
		    add_number += S_GET_VALUE (add_symbolP);
#endif
		  break;


		}		/* switch on symbol seg */
	    }			/* if not in local seg */
	}			/* if there was a + symbol */

      if (pcrel)
	{
#ifndef TC_M88K
	  /* This adjustment is not correct on the m88k, for which the
	     linker does all the computation.  */
	  add_number -= md_pcrel_from (fixP);
#endif
	  if (add_symbolP == 0)
	    {
	      fixP->fx_addsy = &abs_symbol;
	    }			/* if there's an add_symbol */
#ifdef TC_I386
	  /* On the 386 we must adjust by the segment vaddr
	     as well.  Ian Taylor.  */
	  add_number -= segP->scnhdr.s_vaddr;
#endif
	}			/* if pcrel */

      if (!fixP->fx_bit_fixP)
	{
#ifndef TC_M88K
	  /* The m88k uses the offset field of the reloc to get around
	     this problem.  */
	  if ((size == 1 &&
	  (add_number & ~0xFF) && ((add_number & ~0xFF) != (-1 & ~0xFF))) ||
	      (size == 2 &&
	       (add_number & ~0xFFFF) && ((add_number & ~0xFFFF) != (-1 & ~0xFFFF))))
	    {
	      as_bad ("Value of %ld too large for field of %d bytes at 0x%lx",
		      (long) add_number, size,
		      (unsigned long) (fragP->fr_address + where));
	    }			/* generic error checking */
#endif
#ifdef WARN_SIGNED_OVERFLOW_WORD
	  /* Warn if a .word value is too large when treated as
	     a signed number.  We already know it is not too
	     negative.  This is to catch over-large switches
	     generated by gcc on the 68k.  */
	  if (!flagseen['J']
	      && size == 2
	      && add_number > 0x7fff)
	    as_bad ("Signed .word overflow; switch may be too large; %ld at 0x%lx",
		    (long) add_number,
		    (unsigned long) (fragP->fr_address + where));
#endif
	}			/* not a bit fix */
      /* once this fix has been applied, we don't have to output anything
	   nothing more need be done -*/
      md_apply_fix (fixP, add_number);
    }				/* For each fixS in this segment. */
}				/* fixup_segment() */

#endif