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

   Copyright 1990, 91, 92, 93, 94, 95, 1997 Free Software Foundation, Inc.

   Contributed by David Wood at New York University 7/8/91.

   Modified by Johan Rydberg, <johan.rydberg@netinsight.se>

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 OR16 1

#include "bfd.h"

#include "sysdep.h"

#include "libbfd.h"

#include "coff/or16.h"

#include "coff/internal.h"

#include "libcoff.h"

static long get_symbol_value PARAMS ((asymbol *));

static bfd_reloc_status_type or1_reloc

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

static boolean coff_or1_relocate_section

  PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,

     struct internal_reloc *, struct internal_syment *, asection **));

static boolean coff_or1_adjust_symndx

  PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *,

     struct internal_reloc *, boolean *));

static bfd_reloc_status_type or16_reloc

  PARAMS ((bfd *abfd, arelent *reloc_entry, asymbol *symbol_in,

          PTR data, asection *input_section, bfd *output_bfd, char **error_message));

#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)

#define INSERT_HWORD(WORD,HWORD)              \

    (((WORD) & 0xff00ff00) | (((HWORD) & 0xff00) << 8) | ((HWORD)& 0xff))

#define EXTRACT_HWORD(WORD)                   \

    ((((WORD) & 0x00ff0000) >> 8) | ((WORD)& 0xff))

#define SIGN_EXTEND_HWORD(HWORD)              \

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

#define SIGN_EXTEND_12BIT(HWORD)              \

    ((HWORD) & 0x1000 ? (HWORD)|(~0xefffL) : (HWORD))

#define SIGN_EXTEND_26BIT(HWORD)              \

    ((HWORD) & 0x8000000 ? (HWORD)|(~0xfffffffL) : (HWORD))

#define EXTRACT_12BIT(WORD)     ((WORD) & 0x0fff)

#define EXTRACT_26BIT(WORD)     ((WORD) & 0x0fffffff)

#define INSERT_12BIT(WORD,HWORD)              \

    (((WORD) & 0xf000) | (((HWORD) & 0x0fff)))

#define INSERT_26BIT(WORD,HWORD)              \

    (((WORD) & 0xf0000000) | (((HWORD) & 0x0fffffff)))

static reloc_howto_type howto_table[] =

{

  HOWTO (R_OR16_ABS,            /* type */

         0,                     /* rightshift */

         3,                     /* size (0 = byte, 1 = short, 2 = long) */

         32,                    /* bitsize */

         false,                 /* pc_relative */

         0,                     /* bitpos */

         complain_overflow_signed, /* complain_on_overflow */

         or16_reloc,            /* special_function */

         "r_or16_abs",          /* name */

         true,                  /* partial_inplace */

         0xffffffff,            /* src_mask */

         0xffffffff,            /* dst_mask */

         false),                /* pcrel_offset */

  HOWTO (R_OR16_INSN_REL,       /* type */

         1,                     /* rightshift */

         1,                     /* size (0 = byte, 1 = short, 2 = long) */

         12,                    /* bitsize */

         true,                  /* pc_relative */

         0,                     /* bitpos */

         complain_overflow_signed, /* complain_on_overflow */

         or16_reloc,            /* special_function */

         "r_or16_insn_rel",     /* name */

         true,                  /* partial_inplace */

         0x00003fff,            /* src_mask */

         0x00003fff,            /* dst_mask */

         false),                /* pcrel_offset */

  HOWTO (R_OR16_INSN_REL_12,    /* type */

         1,                     /* rightshift */

         1,                     /* size (0 = byte, 1 = short, 2 = long) */

         12,                    /* bitsize */

         true,                  /* pc_relative */

         0,                     /* bitpos */

         complain_overflow_signed, /* complain_on_overflow */

         or16_reloc,            /* special_function */

         "r_or16_insn_rel_12",  /* name */

         true,                  /* partial_inplace */

         0x00003fff,            /* src_mask */

         0x00003fff,            /* dst_mask */

         false),                /* pcrel_offset */

  HOWTO (R_OR16_INSN_REL_26,      /* type */

         1,                     /* rightshift */

         3,                     /* size (0 = byte, 1 = short, 2 = long) */

         26,                    /* bitsize */

         true,                  /* pc_relative */

         0,                     /* bitpos */

         complain_overflow_signed, /* complain_on_overflow */

         or16_reloc,            /* special_function */

         "r_or16_insn_rel_26",  /* name */

         true,                  /* partial_inplace */

         0x1fffffff,            /* src_mask */

         0x1fffffff,            /* dst_mask */

         false),                /* pcrel_offset */

  HOWTO (R_OR16_INSN_ABS,       /* type */

         0,                     /* rightshift */

         3,                     /* size (0 = byte, 1 = short, 2 = long) */

         32,                    /* bitsize */

         false,                 /* pc_relative */

         0,                     /* bitpos */

         complain_overflow_signed, /* complain_on_overflow */

         or16_reloc,            /* special_function */

         "r_or16_insn_abs",     /* name */

         true,                  /* partial_inplace */

         0xffffffff,            /* src_mask */

         0xffffffff,            /* dst_mask */

         false),                /* pcrel_offset */

  HOWTO (R_OR16_INSN_LO,        /* type */

         0,                     /* rightshift */

         1,                     /* size (0 = byte, 1 = short, 2 = long) */

         16,                    /* bitsize */

         false,                 /* pc_relative */

         0,                     /* bitpos */

         complain_overflow_signed, /* complain_on_overflow */

         or16_reloc,            /* special_function */

         "r_or16_insn_rel",     /* name */

         true,                  /* partial_inplace */

         0x0000ffff,            /* src_mask */

         0x0000ffff,            /* dst_mask */

         false),                /* pcrel_offset */

  HOWTO (R_OR16_INSN_HI,        /* type */

         0,                     /* rightshift */

         1,                     /* size (0 = byte, 1 = short, 2 = long) */

         16,                    /* bitsize */

         false,                 /* pc_relative */

         16,                    /* bitpos */

         complain_overflow_signed, /* complain_on_overflow */

         or16_reloc,            /* special_function */

         "r_or16_insn_rel",     /* name */

         true,                  /* partial_inplace */

         0xffff0000,            /* src_mask */

         0xffff0000,            /* dst_mask */

         false),                /* pcrel_offset */

  HOWTO (R_OR16_8,              /* type */

         0,                     /* rightshift */

         0,                     /* size (0 = byte, 1 = short, 2 = long) */

         8,                     /* bitsize */

         false,                 /* pc_relative */

         0,                     /* bitpos */

         complain_overflow_signed, /* complain_on_overflow */

         or16_reloc,            /* special_function */

         "r_or16_insn_rel",     /* name */

         true,                  /* partial_inplace */

         0x000000ff,            /* src_mask */

         0x000000ff,            /* dst_mask */

         false),                /* pcrel_offset */

  HOWTO (R_OR16_16,             /* type */

         0,                     /* rightshift */

         1,                     /* size (0 = byte, 1 = short, 2 = long) */

         16,                    /* bitsize */

         false,                 /* pc_relative */

         0,                     /* bitpos */

         complain_overflow_signed, /* complain_on_overflow */

         or16_reloc,            /* special_function */

         "r_or16_insn_rel",     /* name */

         true,                  /* partial_inplace */

         0x0000ffff,            /* src_mask */

         0x0000ffff,            /* dst_mask */

         false),                /* pcrel_offset */

  HOWTO (R_OR16_32,             /* type */

         0,                     /* rightshift */

         2,                     /* size (0 = byte, 1 = short, 2 = long) */

         32,                    /* bitsize */

         false,                 /* pc_relative */

         0,                     /* bitpos */

         complain_overflow_signed, /* complain_on_overflow */

         or16_reloc,            /* special_function */

         "r_or16_insn_rel",     /* name */

         true,                  /* partial_inplace */

         0xffffffff,            /* src_mask */

         0xffffffff,            /* dst_mask */

         false),                /* pcrel_offset */

};

#if 0

/*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,  or16_reloc, "ABS",     true, 0xffffffff,0xffffffff, false },

  {1},  {2},  {3},   {4},  {5},  {6},  {7},  {8},  {9}, {10},

  {11}, {12}, {13}, {14}, {15}, {16}, {17}, {18}, {19}, {20},

  {21}, {22}, {23},

  { R_IREL,     0, 3, 32, true,   0, complain_overflow_signed,    or16_reloc, "IREL",    true, 0xffffffff,0xffffffff, false },

  { R_IABS,     0, 3, 32, false,  0, complain_overflow_bitfield,  or16_reloc, "IABS",    true, 0xffffffff,0xffffffff, false },

  { R_ILOHALF,  0, 3, 16, true,   0, complain_overflow_signed,    or16_reloc, "ILOHALF", true, 0x0000ffff,0x0000ffff, false },

  { R_IHIHALF,  0, 3, 16, true,   16,complain_overflow_signed,    or16_reloc, "IHIHALF", true, 0xffff0000,0xffff0000, false },

  { R_IHCONST,  0, 3, 16, true,   0, complain_overflow_signed,    or16_reloc, "IHCONST", true, 0xffff0000,0xffff0000, false },

  { R_BYTE,     0, 0, 8,  false,  0, complain_overflow_bitfield,  or16_reloc, "BYTE",    true, 0x000000ff,0x000000ff, false },

  { R_HWORD,    0, 1, 16, false,  0, complain_overflow_bitfield,  or16_reloc, "HWORD",   true, 0x0000ffff,0x0000ffff, false },

  { R_WORD,     0, 2, 32, false,  0, complain_overflow_bitfield,  or16_reloc, "WORD",    true, 0xffffffff,0xffffffff, false },

};

#endif

/* 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 or16 relocations.  */

static bfd_reloc_status_type

or16_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_OR16_INSN_HI)

        {

          part1_consth_active = true;

          part1_consth_value  = 0;

        }

      return(bfd_reloc_undefined);

    }

  if ((part1_consth_active) && (r_type != R_OR16_INSN_HI))

    {

      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_OR16_INSN_REL:

      insn = bfd_get_32(abfd, hit_data);

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

      signed_value = EXTRACT_HWORD(insn);

      signed_value = SIGN_EXTEND_HWORD(signed_value);

      signed_value <<= 2;

      /* See the note on the R_IREL reloc in coff_or16_relocate_section.  */

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

        signed_value = 0;

      signed_value += sym_value + reloc_entry->addend;

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

        {                     /* Absolute jmp/call */

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

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

        }

      else

        {

          /* 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>0x1ffff || signed_value<-0x20000)

            return(bfd_reloc_overflow);

        }

      signed_value >>= 2;

      insn = INSERT_HWORD(insn, signed_value);

      bfd_put_32(abfd, insn ,hit_data);

      break;

    case R_OR16_INSN_REL_12:

      insn = bfd_get_16(abfd, hit_data);

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

      signed_value = EXTRACT_12BIT(insn);

      signed_value = SIGN_EXTEND_12BIT(signed_value);

      signed_value <<= 1;

      /* See the note on the R_IREL reloc in coff_or16_relocate_section.  */

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

        signed_value = 0;

      signed_value += sym_value + reloc_entry->addend;

      /* 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>0x1ffff || signed_value<-0x20000)

        return(bfd_reloc_overflow);

      signed_value >>= 1;

      insn = INSERT_12BIT(insn, signed_value);

      bfd_put_16(abfd, insn ,hit_data);

      break;

    case R_OR16_INSN_REL_26:

      insn = bfd_get_32(abfd, hit_data);

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

      signed_value = EXTRACT_26BIT(insn);

      signed_value = SIGN_EXTEND_26BIT(signed_value);

      signed_value <<= 1;

#if 0

      /* See the note on the R_IREL reloc in coff_or16_relocate_section.  */

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

        signed_value = 0;

#endif

      signed_value += sym_value + reloc_entry->addend;

      /* 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);

      /* CHECK FOR OVERFLOW HERE */

      signed_value >>= 1;

      insn = INSERT_26BIT(insn, signed_value);

      bfd_put_32(abfd, insn ,hit_data);

      break;

    case R_OR16_INSN_LO:

      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_OR16_INSN_HI:

      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_OR16_INSN_IHI */

      break;

    case R_OR16_INSN_IHI:

      insn = bfd_get_32(abfd, hit_data);

      /* consth, part 2

         Now relocate the reference */

      if (part1_consth_active == false)

        {

          *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_OR16_8:

      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_OR16_16:

      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_OR16_32:

      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);

}

#define BADMAG(x) OR16BADMAG(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_OR16_INSN_IHI)

      {

        /* The address of an R_OR16_INSN_IHI 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);

        if (ptr

            && bfd_asymbol_bfd(ptr) == abfd

            && ((ptr->flags & BSF_OLD_COMMON)== 0))

          {

            relent->addend = 0;

          }

        else

          {

            relent->addend = 0;

          }

        relent->address-= section->vma;

        if (reloc->r_type == R_OR16_INSN_HI)

          ihihalf_vaddr = relent->address;

        else

          if (ihihalf_vaddr != (bfd_vma) -1)

            abort ();

      }

}

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

static boolean

coff_or16_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;

{

  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_OR16_INSN_IHI)

        h = NULL;

      else

        h = obj_coff_sym_hashes (input_bfd)[symndx];

      sym = NULL;

      sec = NULL;

      val = 0;

      /* An R_OR16_INSN_IHI reloc does not have a symbol.  Instead, the

         symbol index is an addend.  R_OR16_INSN_IHI is always used in

         conjunction with R_IHHALF.  */

      if (rel->r_type != R_OR16_INSN_IHI)

        {

          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)))

                    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_OR16_INSN_REL_12:

          insn = bfd_get_16 (input_bfd, loc);

          /* Extract the addend.  */

          signed_value = EXTRACT_12BIT (insn);

          signed_value = SIGN_EXTEND_12BIT (signed_value);

          signed_value <<= 1;

          /* Unfortunately, there are two different versions of COFF

             or16.  In the original AMD version, the value stored in

             the field for the R_IREL reloc is a simple addend.  In

             the GNU version, the value is the negative of the address

             of the reloc within section.  We try to cope here by

             assuming the AMD version, unless the addend is exactly

             the negative of the address; in the latter case we assume

             the GNU version.  This means that something like