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/* Intel i386 Mach-O support for BFD.

   Copyright 2009

   Free Software Foundation, Inc.

   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 "mach-o.h"

#include "bfd.h"

#include "libbfd.h"

#include "libiberty.h"

#include "mach-o/reloc.h"

#define bfd_mach_o_object_p bfd_mach_o_i386_object_p

#define bfd_mach_o_core_p bfd_mach_o_i386_core_p

#define bfd_mach_o_mkobject bfd_mach_o_i386_mkobject

static const bfd_target *

bfd_mach_o_i386_object_p (bfd *abfd)

{

  return bfd_mach_o_header_p (abfd, 0, BFD_MACH_O_CPU_TYPE_I386);

}

static const bfd_target *

bfd_mach_o_i386_core_p (bfd *abfd)

{

  return bfd_mach_o_header_p (abfd,

                              BFD_MACH_O_MH_CORE, BFD_MACH_O_CPU_TYPE_I386);

}

static bfd_boolean

bfd_mach_o_i386_mkobject (bfd *abfd)

{

  bfd_mach_o_data_struct *mdata;

  if (!bfd_mach_o_mkobject_init (abfd))

    return FALSE;

  mdata = bfd_mach_o_get_data (abfd);

  mdata->header.magic = BFD_MACH_O_MH_MAGIC;

  mdata->header.cputype = BFD_MACH_O_CPU_TYPE_I386;

  mdata->header.cpusubtype = BFD_MACH_O_CPU_SUBTYPE_X86_ALL;

  mdata->header.byteorder = BFD_ENDIAN_LITTLE;

  mdata->header.version = 1;

  return TRUE;

}

static reloc_howto_type i386_howto_table[]=

{

  /* 0 */

  HOWTO(BFD_RELOC_32, 0, 2, 32, FALSE, 0,

        complain_overflow_bitfield,

        NULL, "32",

        FALSE, 0xffffffff, 0xffffffff, FALSE),

  HOWTO(BFD_RELOC_16, 0, 1, 16, FALSE, 0,

        complain_overflow_bitfield,

        NULL, "16",

        FALSE, 0xffff, 0xffff, FALSE),

  HOWTO(BFD_RELOC_8, 0, 0, 8, FALSE, 0,

        complain_overflow_bitfield,

        NULL, "8",

        FALSE, 0xff, 0xff, FALSE),

  HOWTO(BFD_RELOC_32_PCREL, 0, 2, 32, TRUE, 0,

        complain_overflow_bitfield,

        NULL, "DISP32",

        FALSE, 0xffffffff, 0xffffffff, TRUE),

  /* 4 */

  HOWTO(BFD_RELOC_16_PCREL, 0, 1, 16, TRUE, 0,

        complain_overflow_bitfield,

        NULL, "DISP16",

        FALSE, 0xffff, 0xffff, TRUE),

  HOWTO(BFD_RELOC_MACH_O_SECTDIFF, 0, 2, 32, FALSE, 0,

        complain_overflow_bitfield,

        NULL, "SECTDIFF_32",

        FALSE, 0xffffffff, 0xffffffff, FALSE),

  HOWTO(BFD_RELOC_MACH_O_LOCAL_SECTDIFF, 0, 2, 32, FALSE, 0,

        complain_overflow_bitfield,

        NULL, "LSECTDIFF_32",

        FALSE, 0xffffffff, 0xffffffff, FALSE),

  HOWTO(BFD_RELOC_MACH_O_PAIR, 0, 2, 32, FALSE, 0,

        complain_overflow_bitfield,

        NULL, "PAIR_32",

        FALSE, 0xffffffff, 0xffffffff, FALSE),

  /* 8 */

  HOWTO(BFD_RELOC_MACH_O_SECTDIFF, 0, 1, 16, FALSE, 0,

        complain_overflow_bitfield,

        NULL, "SECTDIFF_16",

        FALSE, 0xffff, 0xffff, FALSE),

  HOWTO(BFD_RELOC_MACH_O_LOCAL_SECTDIFF, 0, 1, 16, FALSE, 0,

        complain_overflow_bitfield,

        NULL, "LSECTDIFF_16",

        FALSE, 0xffff, 0xffff, FALSE),

  HOWTO(BFD_RELOC_MACH_O_PAIR, 0, 1, 16, FALSE, 0,

        complain_overflow_bitfield,

        NULL, "PAIR_16",

        FALSE, 0xffff, 0xffff, FALSE),

};

static bfd_boolean

bfd_mach_o_i386_swap_reloc_in (arelent *res, bfd_mach_o_reloc_info *reloc)

{

  if (reloc->r_scattered)

    {

      switch (reloc->r_type)

        {

        case BFD_MACH_O_GENERIC_RELOC_PAIR:

          if (reloc->r_length == 2)

            {

              res->howto = &i386_howto_table[7];

              res->address = res[-1].address;

              return TRUE;

            }

          else if (reloc->r_length == 1)

            {

              res->howto = &i386_howto_table[10];

              res->address = res[-1].address;

              return TRUE;

            }

          return FALSE;

        case BFD_MACH_O_GENERIC_RELOC_SECTDIFF:

          if (reloc->r_length == 2)

            {

              res->howto = &i386_howto_table[5];

              return TRUE;

            }

          else if (reloc->r_length == 1)

            {

              res->howto = &i386_howto_table[8];

              return TRUE;

            }

          return FALSE;

        case BFD_MACH_O_GENERIC_RELOC_LOCAL_SECTDIFF:

          if (reloc->r_length == 2)

            {

              res->howto = &i386_howto_table[6];

              return TRUE;

            }

          else if (reloc->r_length == 1)

            {

              res->howto = &i386_howto_table[9];

              return TRUE;

            }

          return FALSE;

        default:

          return FALSE;

        }

    }

  else

    {

      switch (reloc->r_type)

        {

        case BFD_MACH_O_GENERIC_RELOC_VANILLA:

          switch ((reloc->r_length << 1) | reloc->r_pcrel)

            {

            case 0: /* len = 0, pcrel = 0  */

              res->howto = &i386_howto_table[2];

              return TRUE;

            case 2: /* len = 1, pcrel = 0  */

              res->howto = &i386_howto_table[1];

              return TRUE;

            case 3: /* len = 1, pcrel = 1  */

              res->howto = &i386_howto_table[4];

              return TRUE;

            case 4: /* len = 2, pcrel = 0  */

              res->howto = &i386_howto_table[0];

              return TRUE;

            case 5: /* len = 2, pcrel = 1  */

              res->howto = &i386_howto_table[3];

              return TRUE;

            default:

              return FALSE;

            }

          break;

        default:

          return FALSE;

        }

    }

}

static bfd_boolean

bfd_mach_o_i386_swap_reloc_out (arelent *rel, bfd_mach_o_reloc_info *rinfo)

{

  rinfo->r_address = rel->address;

  switch (rel->howto->type)

    {

    case BFD_RELOC_32:

    case BFD_RELOC_32_PCREL:

    case BFD_RELOC_16:

    case BFD_RELOC_16_PCREL:

    case BFD_RELOC_8:

      rinfo->r_scattered = 0;

      rinfo->r_type = BFD_MACH_O_GENERIC_RELOC_VANILLA;

      rinfo->r_pcrel = rel->howto->pc_relative;

      rinfo->r_length = rel->howto->size; /* Correct in practice.  */

      if ((*rel->sym_ptr_ptr)->flags & BSF_SECTION_SYM)

        {

          rinfo->r_extern = 0;

          rinfo->r_value = (*rel->sym_ptr_ptr)->section->target_index;

        }

      else

        {

          rinfo->r_extern = 1;

          rinfo->r_value = (*rel->sym_ptr_ptr)->udata.i;

        }

      break;

    case BFD_RELOC_MACH_O_SECTDIFF:

      rinfo->r_scattered = 1;

      rinfo->r_type = BFD_MACH_O_GENERIC_RELOC_SECTDIFF;

      rinfo->r_pcrel = 0;

      rinfo->r_length = rel->howto->size;

      rinfo->r_extern = 0;

      rinfo->r_value = rel->addend;

      break;

    case BFD_RELOC_MACH_O_LOCAL_SECTDIFF:

      rinfo->r_scattered = 1;

      rinfo->r_type = BFD_MACH_O_GENERIC_RELOC_LOCAL_SECTDIFF;

      rinfo->r_pcrel = 0;

      rinfo->r_length = rel->howto->size;

      rinfo->r_extern = 0;

      rinfo->r_value = rel->addend;

      break;

    case BFD_RELOC_MACH_O_PAIR:

      rinfo->r_address = 0;

      rinfo->r_scattered = 1;

      rinfo->r_type = BFD_MACH_O_GENERIC_RELOC_PAIR;

      rinfo->r_pcrel = 0;

      rinfo->r_length = rel->howto->size;

      rinfo->r_extern = 0;

      rinfo->r_value = rel->addend;

      break;

    default:

      return FALSE;

    }

  return TRUE;

}

static reloc_howto_type *

bfd_mach_o_i386_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,

                                       bfd_reloc_code_real_type code)

{

  unsigned int i;

  for (i = 0; i < sizeof (i386_howto_table) / sizeof (*i386_howto_table); i++)

    if (code == i386_howto_table[i].type)

      return &i386_howto_table[i];

  return NULL;

}

static reloc_howto_type *

bfd_mach_o_i386_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,

                                       const char *name ATTRIBUTE_UNUSED)

{

  return NULL;

}

static bfd_boolean

bfd_mach_o_i386_print_thread (bfd *abfd, bfd_mach_o_thread_flavour *thread,

                              void *vfile, char *buf)

{

  FILE *file = (FILE *)vfile;

  switch (thread->flavour)

    {

    case BFD_MACH_O_x86_THREAD_STATE:

      if (thread->size < (8 + 16 * 4))

        return FALSE;

      fprintf (file, "   x86_THREAD_STATE:\n");

      fprintf (file, "    flavor: 0x%08lx  count: 0x%08lx\n",

               (unsigned long)bfd_get_32 (abfd, buf + 0),

               (unsigned long)bfd_get_32 (abfd, buf + 4));

      fprintf (file, "     eax: %08lx  ebx: %08lx  ecx: %08lx  edx: %08lx\n",

               (unsigned long)bfd_get_32 (abfd, buf + 8),

               (unsigned long)bfd_get_32 (abfd, buf + 12),

               (unsigned long)bfd_get_32 (abfd, buf + 16),

               (unsigned long)bfd_get_32 (abfd, buf + 20));

      fprintf (file, "     edi: %08lx  esi: %08lx  ebp: %08lx  esp: %08lx\n",

               (unsigned long)bfd_get_32 (abfd, buf + 24),

               (unsigned long)bfd_get_32 (abfd, buf + 28),

               (unsigned long)bfd_get_32 (abfd, buf + 32),

               (unsigned long)bfd_get_32 (abfd, buf + 36));

      fprintf (file, "      ss: %08lx  flg: %08lx  eip: %08lx   cs: %08lx\n",

               (unsigned long)bfd_get_32 (abfd, buf + 40),

               (unsigned long)bfd_get_32 (abfd, buf + 44),

               (unsigned long)bfd_get_32 (abfd, buf + 48),

               (unsigned long)bfd_get_32 (abfd, buf + 52));

      fprintf (file, "      ds: %08lx   es: %08lx   fs: %08lx   gs: %08lx\n",

               (unsigned long)bfd_get_32 (abfd, buf + 56),

               (unsigned long)bfd_get_32 (abfd, buf + 60),

               (unsigned long)bfd_get_32 (abfd, buf + 64),

               (unsigned long)bfd_get_32 (abfd, buf + 68));

      return TRUE;

    case BFD_MACH_O_x86_FLOAT_STATE:

      if (thread->size < 8)

        return FALSE;

      fprintf (file, "   x86_FLOAT_STATE:\n");

      fprintf (file, "    flavor: 0x%08lx  count: 0x%08lx\n",

               (unsigned long)bfd_get_32 (abfd, buf + 0),

               (unsigned long)bfd_get_32 (abfd, buf + 4));

      return TRUE;

    case BFD_MACH_O_x86_EXCEPTION_STATE:

      if (thread->size < 8 + 3 * 4)

        return FALSE;

      fprintf (file, "   x86_EXCEPTION_STATE:\n");

      fprintf (file, "    flavor: 0x%08lx  count: 0x%08lx\n",

               (unsigned long)bfd_get_32 (abfd, buf + 0),

               (unsigned long)bfd_get_32 (abfd, buf + 4));

      fprintf (file, "    trapno: %08lx  err: %08lx  faultaddr: %08lx\n",

               (unsigned long)bfd_get_32 (abfd, buf + 8),

               (unsigned long)bfd_get_32 (abfd, buf + 12),

               (unsigned long)bfd_get_32 (abfd, buf + 16));

      return TRUE;

    default:

      break;

    }

  return FALSE;

}

static const mach_o_section_name_xlat text_section_names_xlat[] =

  {

    {   ".symbol_stub",                 "__symbol_stub",

        SEC_CODE | SEC_LOAD,            BFD_MACH_O_S_SYMBOL_STUBS,

        BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS,

                                        0},

    {   ".picsymbol_stub",              "__picsymbol_stub",

        SEC_CODE | SEC_LOAD,            BFD_MACH_O_S_SYMBOL_STUBS,

        BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS,

                                        0},

    { NULL, NULL, 0, 0, 0, 0}

  };

static const mach_o_section_name_xlat data_section_names_xlat[] =

  {

    /* The first two are recognized by i386, but not emitted for x86 by

       modern GCC.  */

    {   ".non_lazy_symbol_pointer",     "__nl_symbol_ptr",

        SEC_DATA | SEC_LOAD,            BFD_MACH_O_S_NON_LAZY_SYMBOL_POINTERS,

        BFD_MACH_O_S_ATTR_NONE,         2},

    {   ".lazy_symbol_pointer",         "__la_symbol_ptr",

        SEC_DATA | SEC_LOAD,            BFD_MACH_O_S_LAZY_SYMBOL_POINTERS,

        BFD_MACH_O_S_ATTR_NONE,         2},

    {   ".lazy_symbol_pointer2",        "__la_sym_ptr2",

        SEC_DATA | SEC_LOAD,            BFD_MACH_O_S_LAZY_SYMBOL_POINTERS,

        BFD_MACH_O_S_ATTR_NONE,         2},

    {   ".lazy_symbol_pointer3",        "__la_sym_ptr3",

        SEC_DATA | SEC_LOAD,            BFD_MACH_O_S_LAZY_SYMBOL_POINTERS,

        BFD_MACH_O_S_ATTR_NONE,         2},

    { NULL, NULL, 0, 0, 0, 0}

  };

static const mach_o_section_name_xlat import_section_names_xlat[] =

  {

    {   ".picsymbol_stub3",             "__jump_table",

        SEC_CODE | SEC_LOAD,            BFD_MACH_O_S_SYMBOL_STUBS,

        BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS

        | BFD_MACH_O_S_SELF_MODIFYING_CODE,

                                        6},

    {   ".non_lazy_symbol_pointer_x86", "__pointers",

        SEC_DATA | SEC_LOAD,            BFD_MACH_O_S_NON_LAZY_SYMBOL_POINTERS,

        BFD_MACH_O_S_ATTR_NONE,         2},

    { NULL, NULL, 0, 0, 0, 0}

  };

const mach_o_segment_name_xlat mach_o_i386_segsec_names_xlat[] =

  {

    { "__TEXT", text_section_names_xlat },

    { "__DATA", data_section_names_xlat },

    { "__IMPORT", import_section_names_xlat },

    { NULL, NULL }

  };

#define bfd_mach_o_swap_reloc_in bfd_mach_o_i386_swap_reloc_in

#define bfd_mach_o_swap_reloc_out bfd_mach_o_i386_swap_reloc_out

#define bfd_mach_o_print_thread bfd_mach_o_i386_print_thread

#define bfd_mach_o_tgt_seg_table mach_o_i386_segsec_names_xlat

#define bfd_mach_o_section_type_valid_for_tgt NULL

#define bfd_mach_o_bfd_reloc_type_lookup bfd_mach_o_i386_bfd_reloc_type_lookup 

#define bfd_mach_o_bfd_reloc_name_lookup bfd_mach_o_i386_bfd_reloc_name_lookup

#define TARGET_NAME             mach_o_i386_vec

#define TARGET_STRING           "mach-o-i386"

#define TARGET_ARCHITECTURE     bfd_arch_i386

#define TARGET_BIG_ENDIAN       0

#define TARGET_ARCHIVE          0

#define TARGET_PRIORITY         0

#include "mach-o-target.c"