pe-mips.c

基于4个mips核的noc设计

{
  int mips_type;

  switch (code)
    {
    case BFD_RELOC_16:
      mips_type = MIPS_R_REFHALF;
      break;
    case BFD_RELOC_32:
    case BFD_RELOC_CTOR:
      mips_type = MIPS_R_REFWORD;
      break;
    case BFD_RELOC_MIPS_JMP:
      mips_type = MIPS_R_JMPADDR;
      break;
    case BFD_RELOC_HI16_S:
      mips_type = MIPS_R_REFHI;
      break;
    case BFD_RELOC_LO16:
      mips_type = MIPS_R_REFLO;
      break;
    case BFD_RELOC_MIPS_GPREL:
      mips_type = MIPS_R_GPREL;
      break;
    case BFD_RELOC_MIPS_LITERAL:
      mips_type = MIPS_R_LITERAL;
      break;
/* FIXME?
    case BFD_RELOC_16_PCREL_S2:
      mips_type = MIPS_R_PCREL16;
      break;
    case BFD_RELOC_PCREL_HI16_S:
      mips_type = MIPS_R_RELHI;
      break;
    case BFD_RELOC_PCREL_LO16:
      mips_type = MIPS_R_RELLO;
      break;
    case BFD_RELOC_GPREL32:
      mips_type = MIPS_R_SWITCH;
      break;
*/
    case BFD_RELOC_RVA:
      mips_type = MIPS_R_RVA;
      break;
    default:
      return (reloc_howto_type *) NULL;
    }

  return &howto_table[mips_type];
}

static void
mips_swap_reloc_in (abfd, src, dst)
     bfd *abfd;
     PTR src;
     PTR dst;
{
  static struct internal_reloc pair_prev;
  RELOC *reloc_src = (RELOC *) src;
  struct internal_reloc *reloc_dst = (struct internal_reloc *) dst;

  reloc_dst->r_vaddr = bfd_h_get_32(abfd, (bfd_byte *)reloc_src->r_vaddr);
  reloc_dst->r_symndx =
    bfd_h_get_signed_32(abfd, (bfd_byte *) reloc_src->r_symndx);
  reloc_dst->r_type = bfd_h_get_16(abfd, (bfd_byte *) reloc_src->r_type);
  reloc_dst->r_size = 0;
  reloc_dst->r_extern = 0;
  reloc_dst->r_offset = 0;

  switch (reloc_dst->r_type)
  {
  case MIPS_R_REFHI:
    pair_prev = *reloc_dst;
    break;
  case MIPS_R_PAIR:
    reloc_dst->r_offset = reloc_dst->r_symndx;
    if (reloc_dst->r_offset & 0x8000)
      reloc_dst->r_offset -= 0x10000;
    /*printf ("dj: pair offset is %08x\n", reloc_dst->r_offset);*/
    reloc_dst->r_symndx = pair_prev.r_symndx;
    break;
  }
}

static unsigned int
mips_swap_reloc_out (abfd, src, dst)
     bfd       *abfd;
     PTR	src;
     PTR	dst;
{
  static int prev_offset = 1;
  static bfd_vma prev_addr = 0;
  struct internal_reloc *reloc_src = (struct internal_reloc *)src;
  struct external_reloc *reloc_dst = (struct external_reloc *)dst;

  switch (reloc_src->r_type)
    {
    case MIPS_R_REFHI:
      prev_addr = reloc_src->r_vaddr;
      prev_offset = reloc_src->r_offset;
      break;
    case MIPS_R_REFLO:
      if (reloc_src->r_vaddr == prev_addr)
	{
	  /* FIXME: only slightly hackish.  If we see a REFLO pointing to
	     the same address as a REFHI, we assume this is the matching
	     PAIR reloc and output it accordingly.  The symndx is really
	     the low 16 bits of the addend */
	  bfd_h_put_32 (abfd, reloc_src->r_vaddr,
			(bfd_byte *) reloc_dst->r_vaddr);
	  bfd_h_put_32 (abfd, reloc_src->r_symndx,
			(bfd_byte *) reloc_dst->r_symndx);

	  bfd_h_put_16(abfd, MIPS_R_PAIR, (bfd_byte *)
		       reloc_dst->r_type);
	  return RELSZ;
	}
      break;
    }

  bfd_h_put_32(abfd, reloc_src->r_vaddr, (bfd_byte *) reloc_dst->r_vaddr);
  bfd_h_put_32(abfd, reloc_src->r_symndx, (bfd_byte *) reloc_dst->r_symndx);

  bfd_h_put_16(abfd, reloc_src->r_type, (bfd_byte *)
	       reloc_dst->r_type);
  return RELSZ;
}

#define coff_swap_reloc_in mips_swap_reloc_in
#define coff_swap_reloc_out mips_swap_reloc_out
#define NO_COFF_RELOCS

static boolean
coff_pe_mips_relocate_section (output_bfd, info, input_bfd,
			       input_section, contents, relocs, syms,
			       sections)
     bfd *output_bfd;
     struct bfd_link_info *info;
     bfd *input_bfd;
     asection *input_section;
     bfd_byte *contents;
     struct internal_reloc *relocs;
     struct internal_syment *syms;
     asection **sections;
{
  bfd_vma gp;
  boolean gp_undefined;
  size_t adjust;
  struct internal_reloc *rel;
  struct internal_reloc *rel_end;
  unsigned int i;
  boolean got_lo;

  if (info->relocateable)
  {
    (*_bfd_error_handler) (_("\
%s: `ld -r' not supported with PE MIPS objects\n"),
			  bfd_get_filename (input_bfd));
    bfd_set_error (bfd_error_bad_value);
    return false;
  }

  BFD_ASSERT (input_bfd->xvec->byteorder
	      == output_bfd->xvec->byteorder);

#if 0
  printf ("dj: relocate %s(%s) %08x\n",
	 input_bfd->filename, input_section->name,
	 input_section->output_section->vma + input_section->output_offset);
#endif

  gp = _bfd_get_gp_value (output_bfd);
  if (gp == 0)
    gp_undefined = true;
  else
    gp_undefined = false;

  got_lo = false;

  adjust = 0;

  rel = relocs;
  rel_end = rel + input_section->reloc_count;
  for (i = 0; rel < rel_end; rel++, i++)
    {
      long symndx;
      struct coff_link_hash_entry *h;
      struct internal_syment *sym;
      bfd_vma addend = 0;
      bfd_vma val, tmp, targ, src, low;
      reloc_howto_type *howto;
      unsigned char *mem = contents + rel->r_vaddr;

      symndx = rel->r_symndx;

      if (symndx == -1)
	{
	  h = NULL;
	  sym = NULL;
	}
      else
	{
	  h = obj_coff_sym_hashes (input_bfd)[symndx];
	  sym = syms + symndx;
	}

      /* COFF treats common symbols in one of two ways.  Either the
         size of the symbol is included in the section contents, or it
         is not.  We assume that the size is not included, and force
         the rtype_to_howto function to adjust the addend as needed.  */

      if (sym != NULL && sym->n_scnum != 0)
	addend = - sym->n_value;
      else
	addend = 0;

      howto = bfd_coff_rtype_to_howto (input_bfd, input_section, rel, h,
				       sym, &addend);
      if (howto == NULL)
	return false;

      /* If we are doing a relocateable link, then we can just ignore
         a PC relative reloc that is pcrel_offset.  It will already
         have the correct value.  If this is not a relocateable link,
         then we should ignore the symbol value.  */
      if (howto->pc_relative && howto->pcrel_offset)
	{
	  if (info->relocateable)
	    continue;
	  if (sym != NULL && sym->n_scnum != 0)
	    addend += sym->n_value;
	}

      val = 0;

      if (h == NULL)
	{
	  asection *sec;

	  if (symndx == -1)
	    {
	      sec = bfd_abs_section_ptr;
	      val = 0;
	    }
	  else
	    {
	      sec = sections[symndx];
              val = (sec->output_section->vma
		     + sec->output_offset
		     + sym->n_value);
	      if (! obj_pe (input_bfd))
		val -= sec->vma;
	    }
	}
      else
	{
	  if (h->root.type == bfd_link_hash_defined
	      || h->root.type == bfd_link_hash_defweak)
	    {
	      asection *sec;

	      sec = h->root.u.def.section;
	      val = (h->root.u.def.value
		     + sec->output_section->vma
		     + sec->output_offset);
	      }

	  else if (! info->relocateable)
	    {
	      if (! ((*info->callbacks->undefined_symbol)
		     (info, h->root.root.string, input_bfd, input_section,
		      rel->r_vaddr - input_section->vma, true)))
		return false;
	    }
	}

      src = rel->r_vaddr + input_section->output_section->vma
	+ input_section->output_offset;
#if 0
      printf ("dj: reloc %02x %-8s a=%08x/%08x(%08x) v=%08x+%08x %s\n",
	     rel->r_type, howto_table[rel->r_type].name,
	     src, rel->r_vaddr, *(unsigned long *)mem, val, rel->r_offset,
	     h?h->root.root.string:"(none)");
#endif

      /* OK, at this point the following variables are set up:
	   src = VMA of the memory we're fixing up
	   mem = pointer to memory we're fixing up
	   val = VMA of what we need to refer to
      */

#define UI(x) (*_bfd_error_handler) (_("%s: unimplemented %s\n"), \
				    bfd_get_filename (input_bfd), x); \
	      bfd_set_error (bfd_error_bad_value);

      switch (rel->r_type)
	{
	case MIPS_R_ABSOLUTE:
	  /* ignore these */
	  break;

	case MIPS_R_REFHALF:
	  UI("refhalf");
	  break;

	case MIPS_R_REFWORD:
	  tmp = bfd_get_32(input_bfd, mem);
	  /* printf ("refword: src=%08x targ=%08x+%08x\n", src, tmp, val); */
	  tmp += val;
	  bfd_put_32(input_bfd, tmp, mem);
	  break;

	case MIPS_R_JMPADDR:
	  tmp = bfd_get_32(input_bfd, mem);
	  targ = val + (tmp&0x03ffffff)*4;
	  if ((src & 0xf0000000) != (targ & 0xf0000000))
	    {
	      (*_bfd_error_handler) (_("%s: jump too far away\n"),
				    bfd_get_filename (input_bfd));
	      bfd_set_error (bfd_error_bad_value);
	      return false;
	    }
	  tmp &= 0xfc000000;
	  tmp |= (targ/4) & 0x3ffffff;
	  bfd_put_32(input_bfd, tmp, mem);
	  break;

	case MIPS_R_REFHI:
	  tmp = bfd_get_32(input_bfd, mem);
	  switch (rel[1].r_type)
	    {
	    case MIPS_R_PAIR:
	      /* MS PE object */
	      targ = val + rel[1].r_offset + ((tmp & 0xffff) << 16);
	      break;
	    case MIPS_R_REFLO:
	      /* GNU COFF object */
	      low = bfd_get_32(input_bfd, contents + rel[1].r_vaddr);
	      low &= 0xffff;
	      if (low & 0x8000)
		low -= 0x10000;
	      targ = val + low + ((tmp & 0xffff) << 16);
	      break;
	    default:
	      (*_bfd_error_handler) (_("%s: bad pair/reflo after refhi\n"),
				    bfd_get_filename (input_bfd));
	      bfd_set_error (bfd_error_bad_value);
	      return false;
	    }
	  tmp &= 0xffff0000;
	  tmp |= (targ >> 16) & 0xffff;
	  bfd_put_32(input_bfd, tmp, mem);
	  break;

	case MIPS_R_REFLO:
	  tmp = bfd_get_32(input_bfd, mem);
	  targ = val + (tmp & 0xffff);
	  /* printf ("refword: src=%08x targ=%08x\n", src, targ); */
	  tmp &= 0xffff0000;
	  tmp |= targ & 0xffff;
	  bfd_put_32(input_bfd, tmp, mem);
	  break;

	case MIPS_R_GPREL:
	case MIPS_R_LITERAL:
	  UI("gprel");
	  break;

	case MIPS_R_SECTION:
	  UI("section");
	  break;

	case MIPS_R_SECREL:
	  UI("secrel");
	  break;

	case MIPS_R_SECRELLO:
	  UI("secrello");
	  break;

	case MIPS_R_SECRELHI:
	  UI("secrelhi");
	  break;

	case MIPS_R_RVA:
	  tmp = bfd_get_32 (input_bfd, mem);
	  /* printf ("rva: src=%08x targ=%08x+%08x\n", src, tmp, val); */
	  tmp += val
	    - pe_data (input_section->output_section->owner)->pe_opthdr.ImageBase;
	  bfd_put_32 (input_bfd, tmp, mem);
	  break;

	case MIPS_R_PAIR:
	  /* ignore these */
	  break;
	}
    }

  return true;
}

#define coff_relocate_section coff_pe_mips_relocate_section

#ifdef TARGET_UNDERSCORE

/* If mips gcc uses underscores for symbol names, then it does not use
   a leading dot for local labels, so if TARGET_UNDERSCORE is defined
   we treat all symbols starting with L as local.  */

static boolean coff_mips_is_local_label_name PARAMS ((bfd *, const char *));

static boolean
coff_mips_is_local_label_name (abfd, name)
     bfd *abfd;
     const char *name;
{
  if (name[0] == 'L')
    return true;

  return _bfd_coff_is_local_label_name (abfd, name);
}

#define coff_bfd_is_local_label_name coff_mips_is_local_label_name

#endif /* TARGET_UNDERSCORE */

#define COFF_NO_HACK_SCNHDR_SIZE

#include "coffcode.h"

const bfd_target
#ifdef TARGET_SYM
  TARGET_SYM =
#else
  mipslpe_vec =
#endif
{
#ifdef TARGET_NAME
  TARGET_NAME,
#else
  "pe-mips",			/* name */
#endif
  bfd_target_coff_flavour,
  BFD_ENDIAN_LITTLE,		/* data byte order is little */
  BFD_ENDIAN_LITTLE,		/* header byte order is little */

  (HAS_RELOC | EXEC_P |		/* object flags */
   HAS_LINENO | HAS_DEBUG |
   HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),

#ifndef COFF_WITH_PE
  (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC /* section flags */
   | SEC_CODE | SEC_DATA),
#else
  (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC /* section flags */
   | SEC_CODE | SEC_DATA
   | SEC_LINK_ONCE | SEC_LINK_DUPLICATES),
#endif

#ifdef TARGET_UNDERSCORE
  TARGET_UNDERSCORE,		/* leading underscore */
#else
  0,				/* leading underscore */
#endif
  '/',				/* ar_pad_char */
  15,				/* ar_max_namelen */

  bfd_getl64, bfd_getl_signed_64, bfd_putl64,
     bfd_getl32, bfd_getl_signed_32, bfd_putl32,
     bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
  bfd_getl64, bfd_getl_signed_64, bfd_putl64,
     bfd_getl32, bfd_getl_signed_32, bfd_putl32,
     bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */

/* Note that we allow an object file to be treated as a core file as well.  */
    {_bfd_dummy_target, coff_object_p, /* bfd_check_format */
       bfd_generic_archive_p, coff_object_p},
    {bfd_false, coff_mkobject, _bfd_generic_mkarchive, /* bfd_set_format */
       bfd_false},
    {bfd_false, coff_write_object_contents, /* bfd_write_contents */
       _bfd_write_archive_contents, bfd_false},

     BFD_JUMP_TABLE_GENERIC (coff),
     BFD_JUMP_TABLE_COPY (coff),
     BFD_JUMP_TABLE_CORE (_bfd_nocore),
     BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
     BFD_JUMP_TABLE_SYMBOLS (coff),
     BFD_JUMP_TABLE_RELOCS (coff),
     BFD_JUMP_TABLE_WRITE (coff),
     BFD_JUMP_TABLE_LINK (coff),
     BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),

  NULL,

  COFF_SWAP_TABLE
};