source: trunk/binutils/gas/config/obj-ieee.c

/* obj-format for ieee-695 records.
   Copyright 1991, 1992, 1993, 1994, 1997, 2000
   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 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, 59 Temple Place - Suite 330, Boston, MA
   02111-1307, USA.  */

/* Created by Steve Chamberlain <steve@cygnus.com>.  */

/* This will hopefully become the port through which bfd and gas talk,
   for the moment, only ieee is known to work well.  */

#include "bfd.h"
#include "as.h"
#include "subsegs.h"
#include "output-file.h"
#include "frags.h"

bfd *abfd;

/* How many addresses does the .align take?  */

static relax_addressT
relax_align (address, alignment)
     /* Address now.  */
     register relax_addressT address;

     /* Alignment (binary).  */
     register long alignment;
{
  relax_addressT mask;
  relax_addressT new_address;

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

/* Calculate the size of the frag chain
   and create a bfd section to contain all of it.  */

static void
size_section (abfd, idx)
     bfd *abfd;
     unsigned int idx;
{
  asection *sec;
  unsigned int size = 0;
  fragS *frag = segment_info[idx].frag_root;

  while (frag)
    {
      if (frag->fr_address != size)
        {
          printf (_("Out of step\n"));
          size = frag->fr_address;
        }
      size += frag->fr_fix;
      switch (frag->fr_type)
        {
        case rs_fill:
        case rs_org:
          size += frag->fr_offset * frag->fr_var;
          break;
        case rs_align:
        case rs_align_code:
          {
            addressT off;

            off = relax_align (size, frag->fr_offset);
            if (frag->fr_subtype != 0 && off > frag->fr_subtype)
              off = 0;
            size += off;
          }
        }
      frag = frag->fr_next;
    }
  if (size)
    {
      char *name = segment_info[idx].name;

      if (name == (char *) NULL)
        name = ".data";

      segment_info[idx].user_stuff =
        (char *) (sec = bfd_make_section (abfd, name));
      /* Make it output through itself.  */
      sec->output_section = sec;
      sec->flags |= SEC_HAS_CONTENTS;
      bfd_set_section_size (abfd, sec, size);
    }
}

/* Run through a frag chain and write out the data to go with it.  */

static void
fill_section (abfd, idx)
     bfd *abfd;
     unsigned int idx;
{
  asection *sec = segment_info[idx].user_stuff;

  if (sec)
    {
      fragS *frag = segment_info[idx].frag_root;
      unsigned int offset = 0;
      while (frag)
        {
          unsigned int fill_size;
          unsigned int count;
          switch (frag->fr_type)
            {
            case rs_fill:
            case rs_align:
            case rs_org:
              if (frag->fr_fix)
                {
                  bfd_set_section_contents (abfd,
                                            sec,
                                            frag->fr_literal,
                                            frag->fr_address,
                                            frag->fr_fix);
                }
              offset += frag->fr_fix;
              fill_size = frag->fr_var;
              if (fill_size)
                {
                  unsigned int off = frag->fr_fix;
                  for (count = frag->fr_offset; count; count--)
                    {
                      bfd_set_section_contents (abfd, sec,
                                                frag->fr_literal +
                                                frag->fr_fix,
                                                frag->fr_address + off,
                                                fill_size);
                      off += fill_size;
                    }
                }
              break;
            default:
              abort ();
            }
          frag = frag->fr_next;
        }
    }
}

/* Count the relocations in a chain.  */

static unsigned int
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)
    {
      fixup_ptr = fixup_ptr->fx_next;
      nrelocs++;
    }
  return nrelocs;
}

/* Output all the relocations for a section.  */

void
do_relocs_for (idx)
     unsigned int idx;
{
  unsigned int nrelocs;
  arelent **reloc_ptr_vector;
  arelent *reloc_vector;
  asymbol **ptrs;
  asection *section = (asection *) (segment_info[idx].user_stuff);
  unsigned int i;
  fixS *from;

  if (section)
    {
      nrelocs = count_entries_in_chain (idx);

      reloc_ptr_vector =
        (arelent **) malloc ((nrelocs + 1) * sizeof (arelent *));
      reloc_vector = (arelent *) malloc (nrelocs * sizeof (arelent));
      ptrs = (asymbol **) malloc (nrelocs * sizeof (asymbol *));
      from = segment_info[idx].fix_root;
      for (i = 0; i < nrelocs; i++)
        {
          arelent *to = reloc_vector + i;
          asymbol *s;
          reloc_ptr_vector[i] = to;
          to->howto = (reloc_howto_type *) (from->fx_r_type);

#if 0
          /* We can't represent complicated things in a reloc yet.  */
          if (from->fx_addsy == 0 || from->fx_subsy != 0)
            abort ();
#endif

          s = &(from->fx_addsy->sy_symbol.sy);
          to->address = ((char *) (from->fx_frag->fr_address +
                                   from->fx_where))
            - ((char *) (&(from->fx_frag->fr_literal)));
          to->addend = from->fx_offset;
          /* If we know the symbol which we want to relocate to, turn
             this reloaction into a section relative.

             If this relocation is pcrelative, and we know the
             destination, we still want to keep the relocation - since
             the linker might relax some of the bytes, but it stops
             being pc relative and turns into an absolute relocation.  */
          if (s)
            {
              if ((s->flags & BSF_UNDEFINED) == 0)
                {
                  to->section = s->section;

                  /* We can refer directly to the value field here,
                     rather than using S_GET_VALUE, because this is
                     only called after do_symbols, which sets up the
                     value field.  */
                  to->addend += s->value;

                  to->sym_ptr_ptr = 0;
                  if (to->howto->pcrel_offset)
                    /* This is a pcrel relocation, the addend should
                       be adjusted.  */
                    to->addend -= to->address + 1;
                }
              else
                {
                  to->section = 0;
                  *ptrs = &(from->fx_addsy->sy_symbol.sy);
                  to->sym_ptr_ptr = ptrs;

                  if (to->howto->pcrel_offset)
                    /* This is a pcrel relocation, the addend should
                       be adjusted.  */
                    to->addend -= to->address - 1;
                }
            }
          else
            to->section = 0;

          ptrs++;
          from = from->fx_next;
        }

      /* Attatch to the section.  */
      section->orelocation = reloc_ptr_vector;
      section->reloc_count = nrelocs;
      section->flags |= SEC_LOAD;
    }
}

/* Do the symbols.  */

static void
do_symbols (abfd)
     bfd *abfd;
{
  extern symbolS *symbol_rootP;
  symbolS *ptr;
  asymbol **symbol_ptr_vec;
  asymbol *symbol_vec;
  unsigned int count = 0;
  unsigned int index;

  for (ptr = symbol_rootP;
       ptr != (symbolS *) NULL;
       ptr = ptr->sy_next)
    {
      if (SEG_NORMAL (ptr->sy_symbol.seg))
        {
          ptr->sy_symbol.sy.section =
            (asection *) (segment_info[ptr->sy_symbol.seg].user_stuff);
          S_SET_VALUE (ptr, S_GET_VALUE (ptr));
          if (ptr->sy_symbol.sy.flags == 0)
            ptr->sy_symbol.sy.flags = BSF_LOCAL;
        }
      else
        {
          switch (ptr->sy_symbol.seg)
            {
            case SEG_ABSOLUTE:
              ptr->sy_symbol.sy.flags |= BSF_ABSOLUTE;
              ptr->sy_symbol.sy.section = 0;
              break;
            case SEG_UNKNOWN:
              ptr->sy_symbol.sy.flags = BSF_UNDEFINED;
              ptr->sy_symbol.sy.section = 0;
              break;
            default:
              abort ();
            }
        }
      ptr->sy_symbol.sy.value = S_GET_VALUE (ptr);
      count++;
    }
  symbol_ptr_vec = (asymbol **) malloc ((count + 1) * sizeof (asymbol *));

  index = 0;
  for (ptr = symbol_rootP;
       ptr != (symbolS *) NULL;
       ptr = ptr->sy_next)
    {
      symbol_ptr_vec[index] = &(ptr->sy_symbol.sy);
      index++;
    }
  symbol_ptr_vec[index] = 0;
  abfd->outsymbols = symbol_ptr_vec;
  abfd->symcount = count;
}

/* The generic as->bfd converter. Other backends may have special case
   code.  */

void
bfd_as_write_hook ()
{
  int i;

  for (i = SEG_E0; i < SEG_UNKNOWN; i++)
    size_section (abfd, i);

  for (i = SEG_E0; i < SEG_UNKNOWN; i++)
    fill_section (abfd, i);

  do_symbols (abfd);

  for (i = SEG_E0; i < SEG_UNKNOWN; i++)
    do_relocs_for (i);
}

S_SET_SEGMENT (x, y)
     symbolS *x;
     int y;
{
  x->sy_symbol.seg = y;
}

S_IS_DEFINED (x)
     symbolS *x;
{
  if (SEG_NORMAL (x->sy_symbol.seg))
    {
      return 1;
    }
  switch (x->sy_symbol.seg)
    {
    case SEG_UNKNOWN:
      return 0;
    default:
      abort ();
    }
}

S_IS_EXTERNAL (x)
{
  abort ();
}

S_GET_DESC (x)
{
  abort ();
}

S_GET_SEGMENT (x)
     symbolS *x;
{
  return x->sy_symbol.seg;
}

S_SET_EXTERNAL (x)
     symbolS *x;
{
  x->sy_symbol.sy.flags |= BSF_GLOBAL | BSF_EXPORT;
}

S_SET_NAME (x, y)
     symbolS *x;
     char *y;
{
  x->sy_symbol.sy.name = y;
}

S_GET_OTHER (x)
{
  abort ();
}

S_IS_DEBUG (x)
{
  abort ();
}

#ifndef segment_name
char *
segment_name ()
{
  abort ();
}
#endif

void
obj_read_begin_hook ()
{
}

static void
obj_ieee_section (ignore)
     int ignore;
{
  extern char *input_line_pointer;
  extern char is_end_of_line[];
  char *p = input_line_pointer;
  char *s = p;
  int i;

  /* Look up the name, if it doesn't exist, make it.  */
  while (*p && *p != ' ' && *p != ',' && !is_end_of_line[*p])
    {
      p++;
    }
  for (i = SEG_E0; i < SEG_UNKNOWN; i++)
    {
      if (segment_info[i].hadone)
        {
          if (strncmp (segment_info[i].name, s, p - s) == 0)
            goto ok;
        }
      else
        break;
    }
  if (i == SEG_UNKNOWN)
    {
      as_bad (_("too many sections"));
      return;
    }

  segment_info[i].hadone = 1;
  segment_info[i].name = malloc (p - s + 1);
  memcpy (segment_info[i].name, s, p - s);
  segment_info[i].name[p - s] = 0;
ok:
  subseg_set (i, 0);
  while (!is_end_of_line[*p])
    p++;
  input_line_pointer = p;
}

void cons ();
void s_ignore ();

void s_globl ();
const pseudo_typeS obj_pseudo_table[] =
{
  {"section", obj_ieee_section, 0},
  {"data.b" , cons            , 1},
  {"data.w" , cons            , 2},
  {"data.l" , cons            , 4},
  {"export" , s_globl         , 0},
  {"option" , s_ignore        , 0},
  {"end"    , s_ignore        , 0},
  {"import" , s_ignore        , 0},
  {"sdata"  , stringer        , 0},
  0,
};

void
obj_symbol_new_hook (symbolP)
     symbolS *symbolP;
{
  symbolP->sy_symbol.sy.the_bfd = abfd;
}

#if 1

#ifndef SUB_SEGMENT_ALIGN
#ifdef HANDLE_ALIGN
/* The last subsegment gets an aligment corresponding to the alignment
   of the section.  This allows proper nop-filling at the end of
   code-bearing sections.  */
#define SUB_SEGMENT_ALIGN(SEG, FRCHAIN)                                 \
  (!(FRCHAIN)->frch_next || (FRCHAIN)->frch_next->frch_seg != (SEG)     \
   ? get_recorded_alignment (SEG) : 0)
#else
#define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) 2
#endif
#endif

extern void
write_object_file ()
{
  int i;
  struct frchain *frchain_ptr;
  struct frag *frag_ptr;

  abfd = bfd_openw (out_file_name, "ieee");

  if (abfd == 0)
    {
      as_perror (_("FATAL: Can't create %s"), out_file_name);
      exit (EXIT_FAILURE);
    }
  bfd_set_format (abfd, bfd_object);
  bfd_set_arch_mach (abfd, bfd_arch_h8300, 0);
  subseg_set (1, 0);
  subseg_set (2, 0);
  subseg_set (3, 0);

  /* 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.  */
  for (frchain_ptr = frchain_root;
       frchain_ptr != (struct frchain *) NULL;
       frchain_ptr = frchain_ptr->frch_next)
    {
      int alignment;

      subseg_set (frchain_ptr->frch_seg, frchain_ptr->frch_subseg);

      alignment = SUB_SEGMENT_ALIGN (now_seg, frchain_ptr)

#ifdef md_do_align
      md_do_align (alignment, (char *) NULL, 0, 0, alignment_done);
#endif
      if (subseg_text_p (now_seg))
        frag_align_code (alignment, 0);
      else
        frag_align (alignment, 0, 0);

#ifdef md_do_align
    alignment_done:
#endif

      frag_wane (frag_now);
      frag_now->fr_fix = 0;
      know (frag_now->fr_next == NULL);
    }

  /* Now build one big frag chain for each segment, linked through
     fr_next.  */
  for (i = SEG_E0; i < SEG_UNKNOWN; i++)
    {
      fragS **prev_frag_ptr_ptr;
      struct frchain *next_frchain_ptr;

#if 0
      struct frag **head_ptr = segment_info[i].frag_root;
#endif

      segment_info[i].frag_root = segment_info[i].frchainP->frch_root;
#if 0
      /* I'm not sure what this is for.  */
      for (frchain_ptr = segment_info[i].frchainP->frch_root;
           frchain_ptr != (struct frchain *) NULL;
           frchain_ptr = frchain_ptr->frch_next)
        {
          *head_ptr = frchain_ptr;
          head_ptr = &frchain_ptr->next;
        }
#endif
    }

  for (i = SEG_E0; i < SEG_UNKNOWN; i++)
    relax_segment (segment_info[i].frag_root, i);

  /* Relaxation has completed.  Freeze all syms.  */
  finalize_syms = 1;

  /* Now the addresses of the frags are correct within the segment.  */

  bfd_as_write_hook ();
  bfd_close (abfd);
}

#endif

H_SET_TEXT_SIZE (a, b)
{
  abort ();
}

H_GET_TEXT_SIZE ()
{
  abort ();
}

H_SET_BSS_SIZE ()
{
  abort ();
}

H_SET_STRING_SIZE ()
{
  abort ();
}

H_SET_RELOCATION_SIZE ()
{
  abort ();
}

H_SET_MAGIC_NUMBER ()
{
  abort ();
}

H_GET_FILE_SIZE ()
{
  abort ();
}

H_GET_TEXT_RELOCATION_SIZE ()
{
  abort ();
}