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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
 
                .text
                 nop
                jmp i-4
 
             will fail, because the addend of -4 will happen to equal
             the negative of the address within the section.  The
             compiler will never generate code like this.
 
             At some point in the future we may want to take out this
             check.  */
          if (signed_value == - (long) (rel->r_vaddr - input_section->vma))
            signed_value = 0;
 
          /* Determine the destination of the jump.  */
          signed_value += val;
 
          if ((signed_value & ~0x3ffff) == 0)
            {
              /* We can use an absolute jump.  */
              insn |= (1 << 24);
            }
          else
            {
              /* 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 > 0x1ffff || signed_value < - 0x20000)
                {
                  overflow = true;
                  signed_value = 0;
                }
            }
 
          /* Put the adjusted value back into the instruction.  */
          signed_value >>= 1;
          insn = INSERT_12BIT (insn, signed_value);
 
          bfd_put_16 (input_bfd, (bfd_vma) insn, loc);
          break;
 
        case R_OR16_INSN_REL_26:
          insn = bfd_get_32 (input_bfd, loc);
 
          /* Extract the addend.  */
          signed_value = EXTRACT_26BIT (insn);
          signed_value = SIGN_EXTEND_26BIT (signed_value);
          signed_value <<= 1;
 
          /* Make the destination PC relative.  */
          signed_value -= (input_section->output_section->vma
                           + input_section->output_offset
                           + (rel->r_vaddr - input_section->vma));
 
          /* Put the adjusted value back into the instruction.  */
          signed_value >>= 1;
          insn = INSERT_26BIT (insn, signed_value);
 
          bfd_put_32 (input_bfd, (bfd_vma) insn, loc);
          break;
 
        case R_OR16_INSN_REL:
          insn = bfd_get_32 (input_bfd, loc);
 
          /* Extract the addend.  */
          signed_value = EXTRACT_HWORD (insn);
          signed_value = SIGN_EXTEND_HWORD (signed_value);
          signed_value <<= 2;
 
          /* 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
 
                .text
                 nop
                jmp i-4
 
             will fail, because the addend of -4 will happen to equal
             the negative of the address within the section.  The
             compiler will never generate code like this.
 
             At some point in the future we may want to take out this
             check.  */
          if (signed_value == - (long) (rel->r_vaddr - input_section->vma))
            signed_value = 0;
 
          /* Determine the destination of the jump.  */
          signed_value += val;
 
          if ((signed_value & ~0x3ffff) == 0)
            {
              /* We can use an absolute jump.  */
              insn |= (1 << 24);
            }
          else
            {
              /* 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 > 0x1ffff || signed_value < - 0x20000)
                {
                  overflow = true;
                  signed_value = 0;
                }
            }
 
          /* Put the adjusted value back into the instruction.  */
          signed_value >>= 2;
          insn = INSERT_HWORD (insn, signed_value);
 
          bfd_put_32 (input_bfd, (bfd_vma) insn, loc);
          break;
 
 
        case R_OR16_INSN_LO:
          printf ("val = %#x\n", val);
 
          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_OR16_INSN_HI:
          /* Save the value for the R_OR16_INSN_IHI reloc.  */
          hihalf = true;
          hihalf_val = val;
          break;
 
        case R_OR16_INSN_IHI:
          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_OR16_8:
        case R_OR16_16:
        case R_OR16_32:
          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_or16_relocate_section
 
/* We don't want to change the symndx of a R_OR16_INSN_IHI reloc, since it
   is actually an addend, not a symbol index at all.  */
 
/*ARGSUSED*/
static boolean
coff_or16_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp)
     bfd *obfd;
     struct bfd_link_info *info;
     bfd *ibfd;
     asection *sec;
     struct internal_reloc *irel;
     boolean *adjustedp;
{
  if (irel->r_type == R_OR16_INSN_IHI)
    *adjustedp = true;
  else
    *adjustedp = false;
  return true;
}
 
#define coff_adjust_symndx coff_or16_adjust_symndx
 
#include "coffcode.h"
 
const bfd_target or16coff_big_vec =
{
  "coff-or16-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,
 
  /* hdrs */
  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),
 
  COFF_SWAP_TABLE
};