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/* BFD back-end for OpenRISC 1000 COFF binaries.

   Copyright 2002 Free Software Foundation, Inc.

   Contributed by Ivan Guzvinec  <ivang@opencores.org>

   This file is part of BFD, the Binary File Descriptor library.

   This program 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 of the License, or

   (at your option) any later version.

   This program 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 this program; if not, write to the Free Software

   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#define OR32 1

#include "bfd.h"

#include "sysdep.h"

#include "libbfd.h"

#include "coff/or32.h"

#include "coff/internal.h"

#include "libcoff.h"

static long                   get_symbol_value           PARAMS ((asymbol *));

static bfd_reloc_status_type  or32_reloc                 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));

static boolean                coff_or32_relocate_section PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, struct internal_reloc *, struct internal_syment *, asection **));

static boolean                coff_or32_adjust_symndx    PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, struct internal_reloc *, boolean *));

static void                   reloc_processing           PARAMS ((arelent *, struct internal_reloc *, asymbol **, bfd *, asection *));

#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)

#define INSERT_HWORD(WORD,HWORD)              \

    (((WORD) & 0xffff0000) | ((HWORD)& 0x0000ffff))

#define EXTRACT_HWORD(WORD)                   \

    ((WORD) & 0x0000ffff)

#define SIGN_EXTEND_HWORD(HWORD)              \

    ((HWORD) & 0x8000 ? (HWORD)|(~0xffffL) : (HWORD))

#define INSERT_JUMPTARG(WORD,JT)              \

    (((WORD) & 0xfc000000) | ((JT)& 0x03ffffff))

#define EXTRACT_JUMPTARG(WORD)                   \

    ((WORD) & 0x03ffffff)

#define SIGN_EXTEND_JUMPTARG(JT)              \

    ((JT) & 0x04000000 ? (JT)|(~0x03ffffffL) : (JT))

/* Provided the symbol, returns the value reffed.  */

static long

get_symbol_value (symbol)

     asymbol *symbol;

{

  long relocation = 0;

  if (bfd_is_com_section (symbol->section))

    relocation = 0;

  else

    relocation = symbol->value +

      symbol->section->output_section->vma +

      symbol->section->output_offset;

  return relocation;

}

/* This function is in charge of performing all the or32 relocations.  */

static bfd_reloc_status_type

or32_reloc (abfd, reloc_entry, symbol_in, data, input_section, output_bfd,

            error_message)

     bfd *abfd;

     arelent *reloc_entry;

     asymbol *symbol_in;

     PTR data;

     asection *input_section;

     bfd *output_bfd;

     char **error_message;

{

  /* The consth relocation comes in two parts, we have to remember

     the state between calls, in these variables.  */

  static boolean part1_consth_active = false;

  static unsigned long part1_consth_value;

  unsigned long insn;

  unsigned long sym_value;

  unsigned long unsigned_value;

  unsigned short r_type;

  long signed_value;

  unsigned long addr = reloc_entry->address ;   /*+ input_section->vma*/

  bfd_byte *hit_data =addr + (bfd_byte *)(data);

  r_type = reloc_entry->howto->type;

  if (output_bfd)

    {

      /* Partial linking - do nothing.  */

      reloc_entry->address += input_section->output_offset;

      return bfd_reloc_ok;

    }

  if (symbol_in != NULL

      && bfd_is_und_section (symbol_in->section))

    {

      /* Keep the state machine happy in case we're called again.  */

      if (r_type == R_IHIHALF)

        {

          part1_consth_active = true;

          part1_consth_value  = 0;

        }

      return bfd_reloc_undefined;

    }

  if ((part1_consth_active) && (r_type != R_IHCONST))

    {

      part1_consth_active = false;

      *error_message = (char *) "Missing IHCONST";

      return bfd_reloc_dangerous;

    }

  sym_value = get_symbol_value (symbol_in);

  switch (r_type)

    {

    case R_IREL:

      insn = bfd_get_32(abfd, hit_data);

      /* Take the value in the field and sign extend it.  */

      signed_value = EXTRACT_JUMPTARG (insn);

      signed_value = SIGN_EXTEND_JUMPTARG (signed_value);

      signed_value <<= 2;

      /* See the note on the R_IREL reloc in coff_or32_relocate_section.  */

      if (signed_value == - (long) reloc_entry->address)

        signed_value = 0;

      signed_value += sym_value + reloc_entry->addend;

#if 0

      if ((signed_value & ~0x3ffff) == 0)

        {                     /* Absolute jmp/call.  */

          insn |= (1<<24);    /* Make it absolute.  */

          /* FIXME: Should we change r_type to R_IABS.  */

        }

      else

#endif

        {

          /* Relative jmp/call, so subtract from the value the

             address of the place we're coming from.  */

          signed_value -= (reloc_entry->address

                           + input_section->output_section->vma

                           + input_section->output_offset);

          if (signed_value > 0x7ffffff || signed_value < -0x8000000)

            return bfd_reloc_overflow;

        }

      signed_value >>= 2;

      insn = INSERT_JUMPTARG (insn, signed_value);

      bfd_put_32 (abfd, insn, hit_data);

      break;

    case R_ILOHALF:

      insn = bfd_get_32 (abfd, hit_data);

      unsigned_value = EXTRACT_HWORD (insn);

      unsigned_value +=  sym_value + reloc_entry->addend;

      insn = INSERT_HWORD (insn, unsigned_value);

      bfd_put_32 (abfd, insn, hit_data);

      break;

    case R_IHIHALF:

      insn = bfd_get_32 (abfd, hit_data);

      /* consth, part 1

         Just get the symbol value that is referenced.  */

      part1_consth_active = true;

      part1_consth_value = sym_value + reloc_entry->addend;

      /* Don't modify insn until R_IHCONST.  */

      break;

    case R_IHCONST:

      insn = bfd_get_32 (abfd, hit_data);

      /* consth, part 2

         Now relocate the reference.  */

      if (! part1_consth_active)

        {

          *error_message = (char *) "Missing IHIHALF";

          return bfd_reloc_dangerous;

        }

      /* sym_ptr_ptr = r_symndx, in coff_slurp_reloc_table() */

      unsigned_value = 0;   /*EXTRACT_HWORD(insn) << 16;*/

      unsigned_value += reloc_entry->addend; /* r_symndx */

      unsigned_value += part1_consth_value;

      unsigned_value = unsigned_value >> 16;

      insn = INSERT_HWORD (insn, unsigned_value);

      part1_consth_active = false;

      bfd_put_32 (abfd, insn, hit_data);

      break;

    case R_BYTE:

      insn = bfd_get_8 (abfd, hit_data);

      unsigned_value = insn + sym_value + reloc_entry->addend;

      if (unsigned_value & 0xffffff00)

        return bfd_reloc_overflow;

      bfd_put_8 (abfd, unsigned_value, hit_data);

      break;

    case R_HWORD:

      insn = bfd_get_16 (abfd, hit_data);

      unsigned_value = insn + sym_value + reloc_entry->addend;

      if (unsigned_value & 0xffff0000)

        return bfd_reloc_overflow;

      bfd_put_16 (abfd, insn, hit_data);

      break;

    case R_WORD:

      insn = bfd_get_32 (abfd, hit_data);

      insn += sym_value + reloc_entry->addend;

      bfd_put_32 (abfd, insn, hit_data);

      break;

    default:

      *error_message = _("Unrecognized reloc");

      return bfd_reloc_dangerous;

    }

  return bfd_reloc_ok;

}

/*      type     rightshift

           size

        bitsize

             pc-relative

             bitpos

           absolute

               complain_on_overflow

              special_function

                relocation name

                     partial_inplace

                      src_mask

*/

/* FIXME: I'm not real sure about this table.  */

static reloc_howto_type howto_table[] =

{

  { R_ABS,      0, 3, 32, false,  0, complain_overflow_bitfield,  or32_reloc, "ABS",     true, 0xffffffff,0xffffffff, false },

    EMPTY_HOWTO (1),

    EMPTY_HOWTO (2),

    EMPTY_HOWTO (3),

    EMPTY_HOWTO (4),

    EMPTY_HOWTO (5),

    EMPTY_HOWTO (6),

    EMPTY_HOWTO (7),

    EMPTY_HOWTO (8),

    EMPTY_HOWTO (9),

    EMPTY_HOWTO (10),

    EMPTY_HOWTO (11),

    EMPTY_HOWTO (12),

    EMPTY_HOWTO (13),

    EMPTY_HOWTO (14),

    EMPTY_HOWTO (15),

    EMPTY_HOWTO (16),

    EMPTY_HOWTO (17),

    EMPTY_HOWTO (18),

    EMPTY_HOWTO (19),

    EMPTY_HOWTO (20),

    EMPTY_HOWTO (21),

    EMPTY_HOWTO (22),

    EMPTY_HOWTO (23),

  { R_IREL,     0, 3, 32, true,   0, complain_overflow_signed,    or32_reloc, "IREL",    true, 0xffffffff,0xffffffff, false },

  { R_IABS,     0, 3, 32, false,  0, complain_overflow_bitfield,  or32_reloc, "IABS",    true, 0xffffffff,0xffffffff, false },

  { R_ILOHALF,  0, 3, 16, true,   0, complain_overflow_signed,    or32_reloc, "ILOHALF", true, 0x0000ffff,0x0000ffff, false },

  { R_IHIHALF,  0, 3, 16, true,   16,complain_overflow_signed,    or32_reloc, "IHIHALF", true, 0xffff0000,0xffff0000, false },

  { R_IHCONST,  0, 3, 16, true,   0, complain_overflow_signed,    or32_reloc, "IHCONST", true, 0xffff0000,0xffff0000, false },

  { R_BYTE,     0, 0, 8,  false,  0, complain_overflow_bitfield,  or32_reloc, "BYTE",    true, 0x000000ff,0x000000ff, false },

  { R_HWORD,    0, 1, 16, false,  0, complain_overflow_bitfield,  or32_reloc, "HWORD",   true, 0x0000ffff,0x0000ffff, false },

  { R_WORD,     0, 2, 32, false,  0, complain_overflow_bitfield,  or32_reloc, "WORD",    true, 0xffffffff,0xffffffff, false },

};

#define BADMAG(x) OR32BADMAG (x)

#define RELOC_PROCESSING(relent, reloc, symbols, abfd, section) \

  reloc_processing (relent, reloc, symbols, abfd, section)

static void

reloc_processing (relent,reloc, symbols, abfd, section)

     arelent *relent;

     struct internal_reloc *reloc;

     asymbol **symbols;

     bfd *abfd;

     asection *section;

{

  static bfd_vma ihihalf_vaddr = (bfd_vma) -1;

  relent->address = reloc->r_vaddr;

  relent->howto = howto_table + reloc->r_type;

  if (reloc->r_type == R_IHCONST)

    {

      /* The address of an R_IHCONST should always be the address of

         the immediately preceding R_IHIHALF.  relocs generated by gas

         are correct, but relocs generated by High C are different (I

         can't figure out what the address means for High C).  We can

         handle both gas and High C by ignoring the address here, and

         simply reusing the address saved for R_IHIHALF.  */

      if (ihihalf_vaddr == (bfd_vma) -1)

        abort ();

      relent->address = ihihalf_vaddr;

      ihihalf_vaddr = (bfd_vma) -1;

      relent->addend = reloc->r_symndx;

      relent->sym_ptr_ptr= bfd_abs_section_ptr->symbol_ptr_ptr;

    }

  else

    {

      asymbol *ptr;

      relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];

      ptr = *(relent->sym_ptr_ptr);

      relent->addend = 0;

      relent->address-= section->vma;

      if (reloc->r_type == R_IHIHALF)

        ihihalf_vaddr = relent->address;

      else if (ihihalf_vaddr != (bfd_vma) -1)

        abort ();

    }

}

/* The reloc processing routine for the optimized COFF linker.  */

static boolean

coff_or32_relocate_section (output_bfd, info, input_bfd, input_section,

                            contents, relocs, syms, sections)

     bfd *output_bfd ATTRIBUTE_UNUSED;

     struct bfd_link_info *info;

     bfd *input_bfd;

     asection *input_section;

     bfd_byte *contents;

     struct internal_reloc *relocs;

     struct internal_syment *syms;

     asection **sections;

{

  struct internal_reloc *rel;

  struct internal_reloc *relend;

  boolean hihalf;

  bfd_vma hihalf_val;

  /* If we are performing a relocateable link, we don't need to do a

     thing.  The caller will take care of adjusting the reloc

     addresses and symbol indices.  */

  if (info->relocateable)

    return true;

  hihalf = false;

  hihalf_val = 0;

  rel = relocs;

  relend = rel + input_section->reloc_count;

  for (; rel < relend; rel++)

    {

      long symndx;

      bfd_byte *loc;

      struct coff_link_hash_entry *h;

      struct internal_syment *sym;

      asection *sec;

      bfd_vma val;

      boolean overflow;

      unsigned long insn;

      long signed_value;

      unsigned long unsigned_value;

      bfd_reloc_status_type rstat;

      symndx = rel->r_symndx;

      loc = contents + rel->r_vaddr - input_section->vma;

      if (symndx == -1 || rel->r_type == R_IHCONST)

        h = NULL;

      else

        h = obj_coff_sym_hashes (input_bfd)[symndx];

      sym = NULL;

      sec = NULL;

      val = 0;

      /* An R_IHCONST reloc does not have a symbol.  Instead, the

         symbol index is an addend.  R_IHCONST is always used in

         conjunction with R_IHHALF.  */

      if (rel->r_type != R_IHCONST)

        {

          if (h == NULL)

            {

              if (symndx == -1)

                sec = bfd_abs_section_ptr;

              else

                {

                  sym = syms + symndx;

                  sec = sections[symndx];

                  val = (sec->output_section->vma

                         + sec->output_offset

                         + sym->n_value

                         - sec->vma);

                }

            }

          else

            {

              if (h->root.type == bfd_link_hash_defined

                  || h->root.type == bfd_link_hash_defweak)

                {

                  sec = h->root.u.def.section;

                  val = (h->root.u.def.value

                         + sec->output_section->vma

                         + sec->output_offset);

                }

              else

                {

                  if (! ((*info->callbacks->undefined_symbol)

                         (info, h->root.root.string, input_bfd, input_section,

                          rel->r_vaddr - input_section->vma, true)))

                    return false;

                }

            }

          if (hihalf)

            {

              if (! ((*info->callbacks->reloc_dangerous)

                     (info, "missing IHCONST reloc", input_bfd,

                      input_section, rel->r_vaddr - input_section->vma)))

                return false;

              hihalf = false;

            }

        }

      overflow = false;

      switch (rel->r_type)

        {

        default:

          bfd_set_error (bfd_error_bad_value);

          return false;

        case R_IREL:

          insn = bfd_get_32 (input_bfd, loc);

          /* Extract the addend.  */

          signed_value = EXTRACT_JUMPTARG (insn);

          signed_value = SIGN_EXTEND_JUMPTARG (signed_value);

          signed_value <<= 2;

          /* Determine the destination of the jump.  */

          signed_value += val;

#if 0

          if ((signed_value & ~0x3ffff) == 0)

            {

              /* We can use an absolute jump.  */

              insn |= (1 << 24);

            }

          else

#endif

            {

              /* Make the destination PC relative.  */

              signed_value -= (input_section->output_section->vma

                               + input_section->output_offset

                               + (rel->r_vaddr - input_section->vma));

              if (signed_value > 0x7ffffff || signed_value < - 0x8000000)

                {

                  overflow = true;

                  signed_value = 0;

                }

            }

          /* Put the adjusted value back into the instruction.  */

          signed_value >>= 2;

          insn = INSERT_JUMPTARG(insn, signed_value);

          bfd_put_32 (input_bfd, (bfd_vma) insn, loc);

          break;

        case R_ILOHALF:

          insn = bfd_get_32 (input_bfd, loc);

          unsigned_value = EXTRACT_HWORD (insn);

          unsigned_value += val;

          insn = INSERT_HWORD (insn, unsigned_value);

          bfd_put_32 (input_bfd, insn, loc);

          break;

        case R_IHIHALF:

          /* Save the value for the R_IHCONST reloc.  */

          hihalf = true;

          hihalf_val = val;

          break;

        case R_IHCONST:

          if (! hihalf)

            {

              if (! ((*info->callbacks->reloc_dangerous)

                     (info, "missing IHIHALF reloc", input_bfd,

                      input_section, rel->r_vaddr - input_section->vma)))

                return false;

              hihalf_val = 0;

            }

          insn = bfd_get_32 (input_bfd, loc);

          unsigned_value = rel->r_symndx + hihalf_val;

          unsigned_value >>= 16;

          insn = INSERT_HWORD (insn, unsigned_value);

          bfd_put_32 (input_bfd, (bfd_vma) insn, loc);

          hihalf = false;

          break;

        case R_BYTE:

        case R_HWORD:

        case R_WORD:

          rstat = _bfd_relocate_contents (howto_table + rel->r_type,

                                          input_bfd, val, loc);

          if (rstat == bfd_reloc_overflow)

            overflow = true;

          else if (rstat != bfd_reloc_ok)

            abort ();

          break;

        }

      if (overflow)

        {

          const char *name;

          char buf[SYMNMLEN + 1];

          if (symndx == -1)

            name = "*ABS*";

          else if (h != NULL)

            name = h->root.root.string;

          else if (sym == NULL)

            name = "*unknown*";

          else if (sym->_n._n_n._n_zeroes == 0

                   && sym->_n._n_n._n_offset != 0)

            name = obj_coff_strings (input_bfd) + sym->_n._n_n._n_offset;

          else

            {

              strncpy (buf, sym->_n._n_name, SYMNMLEN);

              buf[SYMNMLEN] = '\0';

              name = buf;

            }

          if (! ((*info->callbacks->reloc_overflow)

                 (info, name, howto_table[rel->r_type].name, (bfd_vma) 0,

                  input_bfd, input_section,

                  rel->r_vaddr - input_section->vma)))

            return false;

        }

    }

  return true;

}

#define coff_relocate_section coff_or32_relocate_section

/* We don't want to change the symndx of a R_IHCONST reloc, since it

   is actually an addend, not a symbol index at all.  */

static boolean

coff_or32_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp)

     bfd *obfd ATTRIBUTE_UNUSED;

     struct bfd_link_info *info ATTRIBUTE_UNUSED;

     bfd *ibfd ATTRIBUTE_UNUSED;

     asection *sec ATTRIBUTE_UNUSED;

     struct internal_reloc *irel;

     boolean *adjustedp;

{

  if (irel->r_type == R_IHCONST)

    *adjustedp = true;

  else

    *adjustedp = false;

  return true;

}

#define coff_adjust_symndx coff_or32_adjust_symndx

#include "coffcode.h"

const bfd_target or32coff_big_vec =

{

  "coff-or32-big",  /* Name.  */

  bfd_target_coff_flavour,

  BFD_ENDIAN_BIG,   /* Data byte order is big.  */

  BFD_ENDIAN_BIG,   /* Header byte order is big.  */

  (HAS_RELOC  | EXEC_P |    /* Object flags.  */

   HAS_LINENO | HAS_DEBUG |

   HAS_SYMS   | HAS_LOCALS | WP_TEXT),

  (SEC_HAS_CONTENTS | SEC_ALLOC | /* Section flags.  */

   SEC_LOAD | SEC_RELOC |

   SEC_READONLY ),

  '_',        /* Leading underscore.  */

  '/',        /* ar_pad_char.  */

  15,         /* ar_max_namelen.  */

  /* Data.  */

  bfd_getb64, bfd_getb_signed_64, bfd_putb64,

  bfd_getb32, bfd_getb_signed_32, bfd_putb32,

  bfd_getb16, bfd_getb_signed_16, bfd_putb16,

  /* Headers.  */

  bfd_getb64, bfd_getb_signed_64, bfd_putb64,

  bfd_getb32, bfd_getb_signed_32, bfd_putb32,

  bfd_getb16, bfd_getb_signed_16, bfd_putb16,

  {

    _bfd_dummy_target,

    coff_object_p,

    bfd_generic_archive_p,

    _bfd_dummy_target

  },

  {

    bfd_false,

    coff_mkobject,

    _bfd_generic_mkarchive,

    bfd_false

  },

  {

    bfd_false,

    coff_write_object_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),

 /* Alternative_target.  */

#ifdef TARGET_LITTLE_SYM

  & TARGET_LITTLE_SYM,

#else

  NULL,

#endif

  COFF_SWAP_TABLE

};