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/* BFD back-end for ns32k a.out-ish binaries.

   Copyright (C) 1990, 91, 92, 94, 95, 96, 1998 Free Software Foundation, Inc.

   Contributed by Ian Dall (idall@eleceng.adelaide.edu.au).

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 BYTES_IN_WORD 4

#include "bfd.h"

#include "aout/aout64.h"

#include "ns32k.h"

#define MYNS(OP) CAT(ns32kaout_,OP)

reloc_howto_type *

MYNS(bfd_reloc_type_lookup)

  PARAMS((bfd *abfd AND

          bfd_reloc_code_real_type code));

boolean

MYNS(write_object_contents)

  PARAMS((bfd *abfd));

/* Avoid multiple definitions from aoutx if supporting standard a.out format(s)

 * as well as this one

 */

#define NAME(x,y) CAT3(ns32kaout,_32_,y)

void bfd_ns32k_arch PARAMS ((void));

#include "libaout.h"

#define MY(OP) MYNS(OP)

#define MY_swap_std_reloc_in MY(swap_std_reloc_in)

#define MY_swap_std_reloc_out MY(swap_std_reloc_out)

static void

MY_swap_std_reloc_in PARAMS ((bfd *abfd, struct reloc_std_external *bytes,

                              arelent *cache_ptr, asymbol **symbols,

                              bfd_size_type symcount));

static void

MY_swap_std_reloc_out PARAMS ((bfd *abfd, arelent *g,

                               struct reloc_std_external *natptr));

/* The ns32k series is ah, unusual, when it comes to relocation.

 * There are three storage methods for relocateable objects.  There

 * are displacements, immediate operands and ordinary twos complement

 * data. Of these, only the last fits into the standard relocation

 * scheme.  Immediate operands are stored huffman encoded and

 * immediate operands are stored big endian (where as the natural byte

 * order is little endian for this achitecture).

 * Note that the ns32k displacement storage method is orthogonal to

 * whether the relocation is pc relative or not. The "displacement"

 * storage scheme is used for essentially all address constants. The

 * displacement can be relative to zero (absolute displacement),

 * relative to the pc (pc relative), the stack pointer, the frame

 * pointer, the static base register and general purpose register etc.

 * For example:

 *

 *  sym1: .long .       # pc relative 2's complement

 *  sym1: .long foo     # 2's complement not pc relative

 *

 *  self:  movd @self, r0 # pc relative displacement

 *         movd foo, r0 # non pc relative displacement

 *

 *  self:  movd self, r0 # pc relative immediate

 *         movd foo, r0 # non pc relative immediate

 *

 * In addition, for historical reasons the encoding of the relocation types

 * in the a.out format relocation entries is such that even the relocation

 * methods which are standard are not encoded the standard way.

 *

 */

reloc_howto_type MY(howto_table)[] =

{

  /* ns32k immediate operands */

  HOWTO (BFD_RELOC_NS32K_IMM_8, 0, 0, 8, false, 0, true,

         _bfd_ns32k_reloc_imm, "NS32K_IMM_8",

         true, 0x000000ff,0x000000ff, false),

  HOWTO (BFD_RELOC_NS32K_IMM_16, 0, 1, 16, false, 0, true,

         _bfd_ns32k_reloc_imm,  "NS32K_IMM_16",

         true, 0x0000ffff,0x0000ffff, false),

  HOWTO (BFD_RELOC_NS32K_IMM_32, 0, 2, 32, false, 0, true,

         _bfd_ns32k_reloc_imm, "NS32K_IMM_32",

         true, 0xffffffff,0xffffffff, false),

  HOWTO (BFD_RELOC_NS32K_IMM_8_PCREL, 0, 0, 8, true, 0, false,

         _bfd_ns32k_reloc_imm, "PCREL_NS32K_IMM_8",

         true, 0x000000ff, 0x000000ff, false),

  HOWTO (BFD_RELOC_NS32K_IMM_16_PCREL, 0, 1, 16, true, 0, false,

         _bfd_ns32k_reloc_imm, "PCREL_NS32K_IMM_16",

         true, 0x0000ffff,0x0000ffff, false),

  HOWTO (BFD_RELOC_NS32K_IMM_32_PCREL, 0, 2, 32, true, 0, false,

         _bfd_ns32k_reloc_imm, "PCREL_NS32K_IMM_32",

         true, 0xffffffff,0xffffffff, false),

  /* ns32k displacements */

  HOWTO (BFD_RELOC_NS32K_DISP_8, 0, 0, 8, false, 0, true,

         _bfd_ns32k_reloc_disp, "NS32K_DISP_8",

         true, 0x000000ff,0x000000ff, false),

  HOWTO (BFD_RELOC_NS32K_DISP_16, 0, 1, 16, false, 0, true,

         _bfd_ns32k_reloc_disp, "NS32K_DISP_16",

         true, 0x0000ffff, 0x0000ffff, false),

  HOWTO (BFD_RELOC_NS32K_DISP_32, 0, 2, 32, false, 0, true,

         _bfd_ns32k_reloc_disp, "NS32K_DISP_32",

         true, 0xffffffff, 0xffffffff, false),

  HOWTO (BFD_RELOC_NS32K_DISP_8_PCREL, 0, 0, 8, true, 0, false,

         _bfd_ns32k_reloc_disp, "PCREL_NS32K_DISP_8",

         true, 0x000000ff,0x000000ff, false),

  HOWTO (BFD_RELOC_NS32K_DISP_16_PCREL, 0, 1, 16, true, 0, false,

         _bfd_ns32k_reloc_disp, "PCREL_NS32K_DISP_16",

         true, 0x0000ffff,0x0000ffff, false),

  HOWTO (BFD_RELOC_NS32K_DISP_32_PCREL, 0, 2, 32, true, 0, false,

         _bfd_ns32k_reloc_disp, "PCREL_NS32K_DISP_32",

         true, 0xffffffff,0xffffffff, false),

  /* Normal 2's complement */

  HOWTO (BFD_RELOC_8, 0, 0, 8, false, 0, complain_overflow_bitfield,0,

         "8", true, 0x000000ff,0x000000ff, false),

  HOWTO (BFD_RELOC_16, 0, 1, 16, false, 0, complain_overflow_bitfield,0,

         "16", true, 0x0000ffff,0x0000ffff, false),

  HOWTO (BFD_RELOC_32, 0, 2, 32, false, 0, complain_overflow_bitfield,0,

         "32", true, 0xffffffff,0xffffffff, false),

  HOWTO (BFD_RELOC_8_PCREL, 0, 0, 8, true, 0, complain_overflow_signed, 0,

         "PCREL_8", true, 0x000000ff,0x000000ff, false),

  HOWTO (BFD_RELOC_16_PCREL, 0, 1, 16, true, 0, complain_overflow_signed, 0,

         "PCREL_16", true, 0x0000ffff,0x0000ffff, false),

  HOWTO (BFD_RELOC_32_PCREL, 0, 2, 32, true, 0, complain_overflow_signed, 0,

         "PCREL_32", true, 0xffffffff,0xffffffff, false),

};

#define CTOR_TABLE_RELOC_HOWTO(BFD) (MY(howto_table) + 14)

#define RELOC_STD_BITS_NS32K_TYPE_BIG 0x06

#define RELOC_STD_BITS_NS32K_TYPE_LITTLE 0x60

#define RELOC_STD_BITS_NS32K_TYPE_SH_BIG 1

#define RELOC_STD_BITS_NS32K_TYPE_SH_LITTLE 5

reloc_howto_type *

MY(reloc_howto)(abfd, rel, r_index, r_extern, r_pcrel)

     bfd *abfd ATTRIBUTE_UNUSED;

     struct reloc_std_external *rel;

     int *r_index;

     int *r_extern;

     int *r_pcrel;

{

  unsigned int r_length;

  int r_ns32k_type;

/*  BFD_ASSERT(bfd_header_little_endian (abfd)); */

  *r_index =  ((rel->r_index[2] << 16)

               | (rel->r_index[1] << 8)

               |  rel->r_index[0] );

  *r_extern  = (0 != (rel->r_type[0] & RELOC_STD_BITS_EXTERN_LITTLE));

  *r_pcrel   = (0 != (rel->r_type[0] & RELOC_STD_BITS_PCREL_LITTLE));

  r_length  =  ((rel->r_type[0] & RELOC_STD_BITS_LENGTH_LITTLE)

                >> RELOC_STD_BITS_LENGTH_SH_LITTLE);

  r_ns32k_type  =  ((rel->r_type[0] & RELOC_STD_BITS_NS32K_TYPE_LITTLE)

                    >> RELOC_STD_BITS_NS32K_TYPE_SH_LITTLE);

  return (MY(howto_table) + r_length + 3 * (*r_pcrel) + 6 * r_ns32k_type);

}

#define MY_reloc_howto(BFD,REL,IN,EX,PC) MY(reloc_howto)(BFD, REL, &IN, &EX, &PC)

void

MY(put_reloc)(abfd, r_extern, r_index, value, howto, reloc)

     bfd *abfd;

     int r_extern;

     int r_index;

     long value;

     reloc_howto_type *howto;

     struct reloc_std_external *reloc;

{

  unsigned int r_length;

  int r_pcrel;

  int r_ns32k_type;

  PUT_WORD (abfd, value, reloc->r_address);

  r_length = howto->size ;      /* Size as a power of two */

  r_pcrel  = (int) howto->pc_relative; /* Relative to PC? */

  r_ns32k_type = (howto - MY(howto_table) )/6;

/*  BFD_ASSERT (bfd_header_little_endian (abfd)); */

  reloc->r_index[2] = r_index >> 16;

  reloc->r_index[1] = r_index >> 8;

  reloc->r_index[0] = r_index;

  reloc->r_type[0] =

    (r_extern?    RELOC_STD_BITS_EXTERN_LITTLE: 0)

      | (r_pcrel?     RELOC_STD_BITS_PCREL_LITTLE: 0)

        | (r_length <<  RELOC_STD_BITS_LENGTH_SH_LITTLE)

          | (r_ns32k_type <<  RELOC_STD_BITS_NS32K_TYPE_SH_LITTLE);

}

#define MY_put_reloc(BFD, EXT, IDX, VAL, HOWTO, RELOC) \

  MY(put_reloc)(BFD, EXT, IDX, VAL, HOWTO, RELOC)

#define STAT_FOR_EXEC

#define MY_final_link_relocate _bfd_ns32k_final_link_relocate

#define MY_relocate_contents _bfd_ns32k_relocate_contents

#include <aoutx.h>

reloc_howto_type *

MY(bfd_reloc_type_lookup)(abfd,code)

     bfd *abfd;

     bfd_reloc_code_real_type code;

{

#define ENTRY(i,j)      case i: return &MY(howto_table)[j]

  int ext = obj_reloc_entry_size (abfd) == RELOC_EXT_SIZE;

  BFD_ASSERT(ext == 0);

  if (code == BFD_RELOC_CTOR)

    switch (bfd_get_arch_info (abfd)->bits_per_address)

      {

      case 32:

        code = BFD_RELOC_32;

        break;

      }

  switch (code)

    {

      ENTRY(BFD_RELOC_NS32K_IMM_8, 0);

      ENTRY(BFD_RELOC_NS32K_IMM_16, 1);

      ENTRY(BFD_RELOC_NS32K_IMM_32, 2);

      ENTRY(BFD_RELOC_NS32K_IMM_8_PCREL, 3);

      ENTRY(BFD_RELOC_NS32K_IMM_16_PCREL, 4);

      ENTRY(BFD_RELOC_NS32K_IMM_32_PCREL, 5);

      ENTRY(BFD_RELOC_NS32K_DISP_8, 6);

      ENTRY(BFD_RELOC_NS32K_DISP_16, 7);

      ENTRY(BFD_RELOC_NS32K_DISP_32, 8);

      ENTRY(BFD_RELOC_NS32K_DISP_8_PCREL, 9);

      ENTRY(BFD_RELOC_NS32K_DISP_16_PCREL, 10);

      ENTRY(BFD_RELOC_NS32K_DISP_32_PCREL, 11);

      ENTRY(BFD_RELOC_8, 12);

      ENTRY(BFD_RELOC_16, 13);

      ENTRY(BFD_RELOC_32, 14);

      ENTRY(BFD_RELOC_8_PCREL, 15);

      ENTRY(BFD_RELOC_16_PCREL, 16);

      ENTRY(BFD_RELOC_32_PCREL, 17);

    default: return (reloc_howto_type *) NULL;

    }

#undef ENTRY

}

static void

MY_swap_std_reloc_in (abfd, bytes, cache_ptr, symbols, symcount)

     bfd *abfd;

     struct reloc_std_external *bytes;

     arelent *cache_ptr;

     asymbol **symbols;

     bfd_size_type symcount ATTRIBUTE_UNUSED;

{

  int r_index;

  int r_extern;

  int r_pcrel;

  struct aoutdata  *su = &(abfd->tdata.aout_data->a);

  cache_ptr->address = bfd_h_get_32 (abfd, bytes->r_address);

  /* now the fun stuff */

  cache_ptr->howto = MY_reloc_howto(abfd, bytes, r_index, r_extern, r_pcrel);

  MOVE_ADDRESS(0);

}

static void

MY_swap_std_reloc_out (abfd, g, natptr)

     bfd *abfd;

     arelent *g;

     struct reloc_std_external *natptr;

{

  int r_index;

  asymbol *sym = *(g->sym_ptr_ptr);

  int r_extern;

  unsigned int r_addend;

  asection *output_section = sym->section->output_section;

  r_addend = g->addend + (*(g->sym_ptr_ptr))->section->output_section->vma;

  /* name was clobbered by aout_write_syms to be symbol index */

  /* If this relocation is relative to a symbol then set the

     r_index to the symbols index, and the r_extern bit.

     Absolute symbols can come in in two ways, either as an offset

     from the abs section, or as a symbol which has an abs value.

     Check for that here.  */

  if (bfd_is_com_section (output_section)

      || output_section == &bfd_abs_section

      || output_section == &bfd_und_section)

    {

      if (bfd_abs_section.symbol == sym)

        {

          /* Whoops, looked like an abs symbol, but is really an offset

             from the abs section */

          r_index = 0;

          r_extern = 0;

        }

      else

        {

          /* Fill in symbol */

          r_extern = 1;

#undef KEEPIT

#define KEEPIT udata.i

          r_index =  (*(g->sym_ptr_ptr))->KEEPIT;

#undef KEEPIT     

        }

    }

  else

    {

      /* Just an ordinary section */

      r_extern = 0;

      r_index  = output_section->target_index;

    }

  MY_put_reloc (abfd, r_extern, r_index, g->address, g->howto, natptr);

}

bfd_reloc_status_type

_bfd_ns32k_relocate_contents (howto, input_bfd, relocation, location)

     reloc_howto_type *howto;

     bfd *input_bfd;

     bfd_vma relocation;

     bfd_byte *location;

{

  int r_ns32k_type = (howto - MY(howto_table)) / 6;

  long (*get_data) PARAMS ((bfd_byte *, long, long));

  int (*put_data) PARAMS ((long, bfd_byte *, long, long));

  switch (r_ns32k_type)

    {

    case 0:

      get_data = _bfd_ns32k_get_immediate;

      put_data = _bfd_ns32k_put_immediate;

      break;

    case 1:

      get_data = _bfd_ns32k_get_displacement;

      put_data = _bfd_ns32k_put_displacement;

      break;

    case 2:

      return _bfd_relocate_contents (howto, input_bfd, relocation,

                                    location);

      /* NOT REACHED */

      break;

    default:

      return bfd_reloc_notsupported;

    }

  return _bfd_do_ns32k_reloc_contents (howto, input_bfd, relocation,

                                       location, get_data, put_data);

}