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

   Copyright 1994, 1995, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2005,

   2007, 2009, 2010 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 3 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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */

#include "sysdep.h"

#include "bfd.h"

/* Avoid multiple definitions from aoutx if supporting standard a.out

   as well as our own.  */

/* Do not "beautify" the CONCAT* macro args.  Traditional C will not

   remove whitespace added here, and thus will fail to concatenate

   the tokens.  */

#define NAME(x,y) CONCAT3 (aoutarm,_32_,y)

#define N_TXTADDR(x)                                            \

  ((N_MAGIC (x) == NMAGIC)                                      \

   ? (bfd_vma) 0x8000                                           \

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

      ? (bfd_vma) 0                                              \

      : ((N_SHARED_LIB (x))                                     \

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

         : (bfd_vma) 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) CONCAT2 (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)

#define MY_bfd_reloc_type_lookup aoutarm_bfd_reloc_type_lookup

#define MY_bfd_reloc_name_lookup aoutarm_bfd_reloc_name_lookup

#include "libaout.h"

#include "aout/aout64.h"

static bfd_reloc_status_type

  MY (fix_pcrel_26) (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);

static bfd_reloc_status_type

  MY (fix_pcrel_26_done) (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);

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)

static reloc_howto_type *

MY (reloc_howto) (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 howto_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);

    }

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

  if (howto_index == 3)

    *r_pcrel = 1;

  return MY (howto_table) + howto_index;

}

#define MY_reloc_howto(BFD, REL, IN, EX, PC) \

        MY (reloc_howto) (BFD, REL, &IN, &EX, &PC)

static void

MY (put_reloc) (bfd *abfd,

                int r_extern,

                int r_index,

                bfd_vma 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);

  /* Size as a power of two.  */

  r_length = howto->size;

  /* 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)

static void

MY (relocatable_reloc) (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) (bfd *abfd ATTRIBUTE_UNUSED,

                        arelent *reloc_entry ATTRIBUTE_UNUSED,

                        asymbol *symbol ATTRIBUTE_UNUSED,

                        void * 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) (bfd *abfd,

                   arelent *reloc_entry,

                   asymbol *symbol,

                   void * data,

                   asection *input_section,

                   bfd *output_bfd,

                   char **error_message ATTRIBUTE_UNUSED)

{

  bfd_vma relocation;

  bfd_size_type addr = reloc_entry->address;

  bfd_vma 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 != 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 & ~ (bfd_vma) 0x03ffffff)

    flag = bfd_reloc_overflow;

  target &= ~ (bfd_vma) 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;

}

static reloc_howto_type *

MY (bfd_reloc_type_lookup) (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_arch_bits_per_address (abfd))

      {

      case 32:

        code = BFD_RELOC_32;

        break;

      default:

        return NULL;

      }

  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 NULL;

    }

}

static reloc_howto_type *

MY (bfd_reloc_name_lookup) (bfd *abfd ATTRIBUTE_UNUSED,

                            const char *r_name)

{

  unsigned int i;

  for (i = 0;

       i < sizeof (MY (howto_table)) / sizeof (MY (howto_table)[0]);

       i++)

    if (MY (howto_table)[i].name != NULL

        && strcasecmp (MY (howto_table)[i].name, r_name) == 0)

      return &MY (howto_table)[i];

  return NULL;

}

#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

void MY_swap_std_reloc_in (bfd *, struct reloc_std_external *, arelent *, asymbol **, bfd_size_type);

void MY_swap_std_reloc_out (bfd *, arelent *, struct reloc_std_external *);

#include "aoutx.h"

void

MY_swap_std_reloc_in (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 = 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 (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;

    }

  /* 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,   /* Headers.  */

  {_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,

  (void *) 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,   /* Headers.  */

  {_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,

  (void *) MY_backend_data,

};