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/* BFD back-end for raw ARM a.out binaries.

   Copyright (C) 1994, 95, 96, 97, 98, 1999 Free Software Foundation, Inc.

   Contributed by Richard Earnshaw (rwe@pegasus.esprit.ec.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 N_TXTADDR(x) \

  ((N_MAGIC(x) == NMAGIC) ? 0x8000 : \

   (N_MAGIC(x) != ZMAGIC) ? 0 : \

   (N_SHARED_LIB(x)) ? ((x).a_entry & ~(TARGET_PAGE_SIZE - 1)) : \

   TEXT_START_ADDR)

#define TEXT_START_ADDR 0x8000

#define TARGET_PAGE_SIZE 0x8000

#define SEGMENT_SIZE TARGET_PAGE_SIZE

#define DEFAULT_ARCH bfd_arch_arm

#define MY(OP) CAT(aoutarm_,OP)

#define N_BADMAG(x) ((((x).a_info & ~007200) != ZMAGIC) && \

                     (((x).a_info & ~006000) != OMAGIC) && \

                     ((x).a_info != NMAGIC))

#define N_MAGIC(x) ((x).a_info & ~07200)

#include "bfd.h"

#include "sysdep.h"

#define MYARM(OP) CAT(aoutarm_,OP)

reloc_howto_type        *MYARM(bfd_reloc_type_lookup)

                                PARAMS((bfd *, bfd_reloc_code_real_type));

static boolean          MYARM(write_object_contents)    PARAMS((bfd *));

/* Avoid multiple defininitions from aoutx if supporting standarad a.out

   as well as our own.  */

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

#define MY_bfd_reloc_type_lookup aoutarm_bfd_reloc_type_lookup

#include "libaout.h"

#include "aout/aout64.h"

static bfd_reloc_status_type

MY(fix_pcrel_26_done)   PARAMS ((bfd *, arelent *, asymbol *, PTR,

                                 asection *, bfd *, char **));

static bfd_reloc_status_type

MY(fix_pcrel_26)         PARAMS ((bfd *, arelent *, asymbol *, PTR,

                                  asection *, bfd *, char **));

static void MY(swap_std_reloc_in) PARAMS ((bfd *, struct reloc_std_external *,

                                           arelent *, asymbol **,

                                           bfd_size_type));

void MY(swap_std_reloc_out) PARAMS ((bfd *, arelent *,

                                     struct reloc_std_external *));

reloc_howto_type MY(howto_table)[] =

{

  /* type rs size bsz pcrel bitpos ovrf sf name part_inpl readmask setmask

     pcdone */

  HOWTO (0, 0, 0, 8, false, 0, complain_overflow_bitfield, 0, "8", true,

         0x000000ff, 0x000000ff, false),

  HOWTO (1, 0, 1, 16, false, 0, complain_overflow_bitfield, 0, "16", true,

         0x0000ffff, 0x0000ffff, false),

  HOWTO (2, 0, 2, 32, false, 0, complain_overflow_bitfield, 0, "32", true,

         0xffffffff, 0xffffffff, false),

  HOWTO (3, 2, 2, 26, true, 0, complain_overflow_signed, MY(fix_pcrel_26),

         "ARM26", true, 0x00ffffff, 0x00ffffff, true),

  HOWTO (4, 0, 0, 8, true, 0, complain_overflow_signed, 0, "DISP8", true,

         0x000000ff, 0x000000ff, true),

  HOWTO (5, 0, 1, 16, true, 0, complain_overflow_signed, 0, "DISP16", true,

         0x0000ffff, 0x0000ffff, true),

  HOWTO (6, 0, 2, 32, true, 0, complain_overflow_signed, 0, "DISP32", true,

         0xffffffff, 0xffffffff, true),

  HOWTO (7, 2, 2, 26, false, 0, complain_overflow_signed,

         MY(fix_pcrel_26_done), "ARM26D", true, 0x0, 0x0,

         false),

  EMPTY_HOWTO (-1),

  HOWTO (9, 0, -1, 16, false, 0, complain_overflow_bitfield, 0, "NEG16", true,

         0x0000ffff, 0x0000ffff, false),

  HOWTO (10, 0, -2, 32, false, 0, complain_overflow_bitfield, 0, "NEG32", true,

         0xffffffff, 0xffffffff, false)

};

#define RELOC_ARM_BITS_NEG_BIG      ((unsigned int) 0x08)

#define RELOC_ARM_BITS_NEG_LITTLE   ((unsigned int) 0x10)

reloc_howto_type *

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

     bfd *abfd;

     struct reloc_std_external *rel;

     int *r_index;

     int *r_extern;

     int *r_pcrel;

{

  unsigned int r_length;

  unsigned int r_pcrel_done;

  unsigned int r_neg;

  int index;

  *r_pcrel = 0;

  if (bfd_header_big_endian (abfd))

    {

      *r_index     =  ((rel->r_index[0] << 16)

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

                       | rel->r_index[2]);

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

      r_pcrel_done = (0 != (rel->r_type[0] & RELOC_STD_BITS_PCREL_BIG));

      r_neg        = (0 != (rel->r_type[0] & RELOC_ARM_BITS_NEG_BIG));

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

                      >> RELOC_STD_BITS_LENGTH_SH_BIG);

    }

  else

    {

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

      r_neg        = (0 != (rel->r_type[0] & RELOC_ARM_BITS_NEG_LITTLE));

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

                      >> RELOC_STD_BITS_LENGTH_SH_LITTLE);

    }

  index = r_length + 4 * r_pcrel_done + 8 * r_neg;

  if (index == 3)

    *r_pcrel = 1;

  return MY(howto_table) + index;

}

#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_neg;

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

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

  /* Special case for branch relocations. */

  if (howto->type == 3 || howto->type == 7)

    r_length = 3;

  r_pcrel  = howto->type & 4;   /* PC Relative done? */

  r_neg = howto->type & 8;      /* Negative relocation */

  if (bfd_header_big_endian (abfd))

    {

      reloc->r_index[0] = r_index >> 16;

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

      reloc->r_index[2] = r_index;

      reloc->r_type[0] =

        ((r_extern ?     RELOC_STD_BITS_EXTERN_BIG : 0)

         | (r_pcrel ?    RELOC_STD_BITS_PCREL_BIG : 0)

         | (r_neg ?      RELOC_ARM_BITS_NEG_BIG : 0)

         | (r_length <<  RELOC_STD_BITS_LENGTH_SH_BIG));

    }

  else

    {

      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_neg ?      RELOC_ARM_BITS_NEG_LITTLE : 0)

         | (r_length <<  RELOC_STD_BITS_LENGTH_SH_LITTLE));

    }

}

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

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

void

MY(relocatable_reloc)(howto, abfd, reloc, amount, r_addr)

     reloc_howto_type *howto;

     bfd *abfd;

     struct reloc_std_external *reloc;

     bfd_vma *amount;

     bfd_vma r_addr;

{

  if (howto->type == 3)

    {

      if (reloc->r_type[0]

          & (bfd_header_big_endian (abfd)

             ? RELOC_STD_BITS_EXTERN_BIG : RELOC_STD_BITS_EXTERN_LITTLE))

        {

          /* The reloc is still external, so don't modify anything. */

          *amount = 0;

        }

      else

        {

          *amount -= r_addr;

          /* Change the r_pcrel value -- on the ARM, this bit is set once the

             relocation is done.  */

          if (bfd_header_big_endian (abfd))

            reloc->r_type[0] |= RELOC_STD_BITS_PCREL_BIG;

          else

            reloc->r_type[0] |= RELOC_STD_BITS_PCREL_LITTLE;

        }

    }

  else if (howto->type == 7)

    *amount = 0;

}

#define MY_relocatable_reloc(HOW, BFD, REL, AMOUNT, ADDR) \

  MY(relocatable_reloc)(HOW, BFD, REL, &(AMOUNT), ADDR)

static bfd_reloc_status_type

MY(fix_pcrel_26_done) (abfd, reloc_entry, symbol, data, input_section,

                       output_bfd, error_message)

     bfd *abfd ATTRIBUTE_UNUSED;

     arelent *reloc_entry ATTRIBUTE_UNUSED;

     asymbol *symbol ATTRIBUTE_UNUSED;

     PTR data ATTRIBUTE_UNUSED;

     asection *input_section ATTRIBUTE_UNUSED;

     bfd *output_bfd ATTRIBUTE_UNUSED;

     char **error_message ATTRIBUTE_UNUSED;

{

  /* This is dead simple at present.  */

  return bfd_reloc_ok;

}

static bfd_reloc_status_type

MY(fix_pcrel_26) (abfd, reloc_entry, symbol, data, input_section,

                  output_bfd, error_message)

     bfd *abfd;

     arelent *reloc_entry;

     asymbol *symbol;

     PTR data;

     asection *input_section;

     bfd *output_bfd;

     char **error_message ATTRIBUTE_UNUSED;

{

  bfd_vma relocation;

  bfd_size_type addr = reloc_entry->address;

  long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);

  bfd_reloc_status_type flag = bfd_reloc_ok;

  /* If this is an undefined symbol, return error */

  if (symbol->section == &bfd_und_section

      && (symbol->flags & BSF_WEAK) == 0)

    return output_bfd ? bfd_reloc_ok : bfd_reloc_undefined;

  /* If the sections are different, and we are doing a partial relocation,

     just ignore it for now.  */

  if (symbol->section->name != input_section->name

      && output_bfd != (bfd *)NULL)

    return bfd_reloc_ok;

  relocation = (target & 0x00ffffff) << 2;

  relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend */

  relocation += symbol->value;

  relocation += symbol->section->output_section->vma;

  relocation += symbol->section->output_offset;

  relocation += reloc_entry->addend;

  relocation -= input_section->output_section->vma;

  relocation -= input_section->output_offset;

  relocation -= addr;

  if (relocation & 3)

    return bfd_reloc_overflow;

  /* Check for overflow */

  if (relocation & 0x02000000)

    {

      if ((relocation & ~ (bfd_vma) 0x03ffffff) != ~ (bfd_vma) 0x03ffffff)

        flag = bfd_reloc_overflow;

    }

  else if (relocation & ~0x03ffffff)

    flag = bfd_reloc_overflow;

  target &= ~0x00ffffff;

  target |= (relocation >> 2) & 0x00ffffff;

  bfd_put_32 (abfd, target, (bfd_byte *) data + addr);

  /* Now the ARM magic... Change the reloc type so that it is marked as done.

     Strictly this is only necessary if we are doing a partial relocation.  */

  reloc_entry->howto = &MY(howto_table)[7];

  return flag;

}

reloc_howto_type *

MY(bfd_reloc_type_lookup)(abfd,code)

     bfd *abfd;

     bfd_reloc_code_real_type code;

{

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

  if (code == BFD_RELOC_CTOR)

    switch (bfd_get_arch_info (abfd)->bits_per_address)

      {

      case 32:

        code = BFD_RELOC_32;

        break;

      default: return (CONST struct reloc_howto_struct *) 0;

      }

  switch (code)

    {

      ASTD (BFD_RELOC_16, 1);

      ASTD (BFD_RELOC_32, 2);

      ASTD (BFD_RELOC_ARM_PCREL_BRANCH, 3);

      ASTD (BFD_RELOC_8_PCREL, 4);

      ASTD (BFD_RELOC_16_PCREL, 5);

      ASTD (BFD_RELOC_32_PCREL, 6);

    default: return (CONST struct reloc_howto_struct *) 0;

    }

}

#define MY_swap_std_reloc_in MY(swap_std_reloc_in)

#define MY_swap_std_reloc_out MY(swap_std_reloc_out)

#define MY_get_section_contents _bfd_generic_get_section_contents

/* #define MY_bfd_link_hash_table_create _bfd_generic_link_hash_table_create */

/* #define MY_bfd_link_add_symbols _bfd_generic_link_add_symbols */

/* #define MY_bfd_final_link _bfd_generic_final_link */

#include "aoutx.h"

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);

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

  MOVE_ADDRESS (0);

}

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;

  int r_length;

  int r_pcrel;

  int r_neg = 0; /* Negative relocs use the BASEREL bit.  */

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

  PUT_WORD(abfd, g->address, natptr->r_address);

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

  if (r_length < 0)

    {

      r_length = -r_length;

      r_neg = 1;

    }

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

  /* For RISC iX, in pc-relative relocs the r_pcrel bit means that the

     relocation has been done already (Only for the 26-bit one I think)???!!!

     */

  if (g->howto->type == 3)

    {

      r_length = 3;

      r_pcrel = 0;

    }

  else if (g->howto->type == 7)

    {

      r_length = 3;

      r_pcrel = 1;

    }

#if 0

  /* For a standard reloc, the addend is in the object file.  */

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

#endif

  /* 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;

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

        }

    }

  else

    {

      /* Just an ordinary section */

      r_extern = 0;

      r_index  = output_section->target_index;

    }

  /* now the fun stuff */

  if (bfd_header_big_endian (abfd))

    {

      natptr->r_index[0] = r_index >> 16;

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

      natptr->r_index[2] = r_index;

      natptr->r_type[0] =

        (  (r_extern ?   RELOC_STD_BITS_EXTERN_BIG: 0)

         | (r_pcrel  ?   RELOC_STD_BITS_PCREL_BIG: 0)

         | (r_neg    ?   RELOC_ARM_BITS_NEG_BIG: 0)

         | (r_length <<  RELOC_STD_BITS_LENGTH_SH_BIG));

    }

  else

    {

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

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

      natptr->r_index[0] = r_index;

      natptr->r_type[0] =

        (  (r_extern ?   RELOC_STD_BITS_EXTERN_LITTLE: 0)

         | (r_pcrel  ?   RELOC_STD_BITS_PCREL_LITTLE: 0)

         | (r_neg    ?   RELOC_ARM_BITS_NEG_LITTLE: 0)

         | (r_length <<  RELOC_STD_BITS_LENGTH_SH_LITTLE));

    }

}

#define MY_BFD_TARGET

#include "aout-target.h"

extern const bfd_target aout_arm_big_vec;

const bfd_target aout_arm_little_vec =

{

  "a.out-arm-little",           /* name */

  bfd_target_aout_flavour,

  BFD_ENDIAN_LITTLE,            /* target byte order (little) */

  BFD_ENDIAN_LITTLE,            /* target headers byte order (little) */

  (HAS_RELOC | EXEC_P |         /* object flags */

   HAS_LINENO | HAS_DEBUG |

   HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT | D_PAGED),

  (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA),

  MY_symbol_leading_char,

  AR_PAD_CHAR,                  /* 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 */

    {_bfd_dummy_target, MY_object_p, /* bfd_check_format */

       bfd_generic_archive_p, MY_core_file_p},

    {bfd_false, MY_mkobject,    /* bfd_set_format */

       _bfd_generic_mkarchive, bfd_false},

    {bfd_false, MY_write_object_contents, /* bfd_write_contents */

       _bfd_write_archive_contents, bfd_false},

     BFD_JUMP_TABLE_GENERIC (MY),

     BFD_JUMP_TABLE_COPY (MY),

     BFD_JUMP_TABLE_CORE (MY),

     BFD_JUMP_TABLE_ARCHIVE (MY),

     BFD_JUMP_TABLE_SYMBOLS (MY),

     BFD_JUMP_TABLE_RELOCS (MY),

     BFD_JUMP_TABLE_WRITE (MY),

     BFD_JUMP_TABLE_LINK (MY),

     BFD_JUMP_TABLE_DYNAMIC (MY),

  & aout_arm_big_vec,

  (PTR) MY_backend_data,

};

const bfd_target aout_arm_big_vec =

{

  "a.out-arm-big",           /* name */

  bfd_target_aout_flavour,

  BFD_ENDIAN_BIG,               /* target byte order (big) */

  BFD_ENDIAN_BIG,               /* target headers byte order (big) */

  (HAS_RELOC | EXEC_P |         /* object flags */

   HAS_LINENO | HAS_DEBUG |

   HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT | D_PAGED),

  (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA),

  MY_symbol_leading_char,

  AR_PAD_CHAR,                  /* ar_pad_char */

  15,                           /* ar_max_namelen */

  bfd_getb64, bfd_getb_signed_64, bfd_putb64,

     bfd_getb32, bfd_getb_signed_32, bfd_putb32,

     bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* 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_dummy_target, MY_object_p, /* bfd_check_format */

       bfd_generic_archive_p, MY_core_file_p},

    {bfd_false, MY_mkobject,    /* bfd_set_format */

       _bfd_generic_mkarchive, bfd_false},

    {bfd_false, MY_write_object_contents, /* bfd_write_contents */

       _bfd_write_archive_contents, bfd_false},

     BFD_JUMP_TABLE_GENERIC (MY),

     BFD_JUMP_TABLE_COPY (MY),

     BFD_JUMP_TABLE_CORE (MY),

     BFD_JUMP_TABLE_ARCHIVE (MY),

     BFD_JUMP_TABLE_SYMBOLS (MY),

     BFD_JUMP_TABLE_RELOCS (MY),

     BFD_JUMP_TABLE_WRITE (MY),

     BFD_JUMP_TABLE_LINK (MY),

     BFD_JUMP_TABLE_DYNAMIC (MY),

  & aout_arm_little_vec,

  (PTR) MY_backend_data,

};