/* AArch-64 Mach-O support for BFD.

   Copyright (C) 2015-2025 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 "bfd.h"

#include "libbfd.h"

#include "libiberty.h"

#include "mach-o.h"

#include "mach-o/arm64.h"

#define bfd_mach_o_object_p bfd_mach_o_arm64_object_p

#define bfd_mach_o_core_p bfd_mach_o_arm64_core_p

#define bfd_mach_o_mkobject bfd_mach_o_arm64_mkobject

#define bfd_mach_o_canonicalize_one_reloc \

  bfd_mach_o_arm64_canonicalize_one_reloc

#define bfd_mach_o_swap_reloc_out NULL

#define bfd_mach_o_bfd_reloc_type_lookup bfd_mach_o_arm64_bfd_reloc_type_lookup

#define bfd_mach_o_bfd_reloc_name_lookup bfd_mach_o_arm64_bfd_reloc_name_lookup

#define bfd_mach_o_print_thread NULL

#define bfd_mach_o_tgt_seg_table NULL

#define bfd_mach_o_section_type_valid_for_tgt NULL

static bfd_cleanup

bfd_mach_o_arm64_object_p (bfd *abfd)

{

  return bfd_mach_o_header_p (abfd, 0, 0, BFD_MACH_O_CPU_TYPE_ARM64);

}

static bfd_cleanup

bfd_mach_o_arm64_core_p (bfd *abfd)

{

  return bfd_mach_o_header_p (abfd, 0,

            BFD_MACH_O_MH_CORE, BFD_MACH_O_CPU_TYPE_ARM64);

}

static bool

bfd_mach_o_arm64_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_ARM64;

  mdata->header.cpusubtype = BFD_MACH_O_CPU_SUBTYPE_ARM64_ALL;

  mdata->header.byteorder = BFD_ENDIAN_LITTLE;

  mdata->header.version = 1;

  return true;

}

/* In case we're on a 32-bit machine, construct a 64-bit "-1" value.  */

#define MINUS_ONE (~ (bfd_vma) 0)

static reloc_howto_type arm64_howto_table[]=

{

  /* 0 */

  HOWTO (BFD_RELOC_64, 0, 8, 64, false, 0,

   complain_overflow_bitfield,

   NULL, "64",

   false, MINUS_ONE, MINUS_ONE, false),

  HOWTO (BFD_RELOC_32, 0, 4, 32, false, 0,

   complain_overflow_bitfield,

   NULL, "32",

   false, 0xffffffff, 0xffffffff, false),

  HOWTO (BFD_RELOC_16, 0, 2, 16, false, 0,

   complain_overflow_bitfield,

   NULL, "16",

   false, 0xffff, 0xffff, false),

  HOWTO (BFD_RELOC_8, 0, 1, 8, false, 0,

   complain_overflow_bitfield,

   NULL, "8",

   false, 0xff, 0xff, false),

  /* 4 */

  HOWTO (BFD_RELOC_64_PCREL, 0, 8, 64, true, 0,

   complain_overflow_bitfield,

   NULL, "DISP64",

   false, MINUS_ONE, MINUS_ONE, true),

  HOWTO (BFD_RELOC_32_PCREL, 0, 4, 32, true, 0,

   complain_overflow_bitfield,

   NULL, "DISP32",

   false, 0xffffffff, 0xffffffff, true),

  HOWTO (BFD_RELOC_16_PCREL, 0, 2, 16, true, 0,

   complain_overflow_bitfield,

   NULL, "DISP16",

   false, 0xffff, 0xffff, true),

  HOWTO (BFD_RELOC_AARCH64_CALL26, 0, 4, 26, true, 0,

   complain_overflow_bitfield,

   NULL, "BRANCH26",

   false, 0x03ffffff, 0x03ffffff, true),

  /* 8 */

  HOWTO (BFD_RELOC_AARCH64_ADR_HI21_PCREL, 12, 4, 21, true, 0,

   complain_overflow_signed,

   NULL, "PAGE21",

   false, 0x1fffff, 0x1fffff, true),

  HOWTO (BFD_RELOC_AARCH64_LDST16_LO12, 1, 4, 12, true, 0,

   complain_overflow_signed,

   NULL, "PGOFF12",

   false, 0xffe, 0xffe, true),

  HOWTO (BFD_RELOC_MACH_O_ARM64_ADDEND, 0, 4, 32, false, 0,

   complain_overflow_signed,

   NULL, "ADDEND",

   false, 0xffffffff, 0xffffffff, false),

  HOWTO (BFD_RELOC_MACH_O_SUBTRACTOR32, 0, 4, 32, false, 0,

   complain_overflow_bitfield,

   NULL, "SUBTRACTOR32",

   false, 0xffffffff, 0xffffffff, false),

  /* 12 */

  HOWTO (BFD_RELOC_MACH_O_SUBTRACTOR64, 0, 8, 64, false, 0,

   complain_overflow_bitfield,

   NULL, "SUBTRACTOR64",

   false, MINUS_ONE, MINUS_ONE, false),

  HOWTO (BFD_RELOC_MACH_O_ARM64_GOT_LOAD_PAGE21, 12, 4, 21, true, 0,

   complain_overflow_signed,

   NULL, "GOT_LD_PG21",

   false, 0x1fffff, 0x1fffff, true),

  HOWTO (BFD_RELOC_MACH_O_ARM64_GOT_LOAD_PAGEOFF12, 1, 4, 12, true, 0,

   complain_overflow_signed,

   NULL, "GOT_LD_PGOFF12",

   false, 0xffe, 0xffe, true),

  HOWTO (BFD_RELOC_MACH_O_ARM64_POINTER_TO_GOT, 0, 4, 32, true, 0,

   complain_overflow_bitfield,

   NULL, "PTR_TO_GOT",

   false, 0xffffffff, 0xffffffff, true),

};

static bool

bfd_mach_o_arm64_canonicalize_one_reloc (bfd *       abfd,

           struct mach_o_reloc_info_external * raw,

           arelent *   res,

           asymbol **  syms,

           arelent *   res_base ATTRIBUTE_UNUSED)

{

  bfd_mach_o_reloc_info reloc;

  res->address = bfd_get_32 (abfd, raw->r_address);

  if (res->address & BFD_MACH_O_SR_SCATTERED)

    {

      /* Only non-scattered relocations.  */

      return false;

    }

  /* The value and info fields have to be extracted dependent on target

     endian-ness.  */

  bfd_mach_o_swap_in_non_scattered_reloc (abfd, &reloc, raw->r_symbolnum);

  if (reloc.r_type == BFD_MACH_O_ARM64_RELOC_ADDEND)

    {

      if (reloc.r_length == 2 && reloc.r_pcrel == 0)

  {

    res->sym_ptr_ptr = &bfd_abs_section_ptr->symbol;

    res->addend = reloc.r_value;

    res->howto = &arm64_howto_table[10];

    return true;

  }

      return false;

    }

  if (!bfd_mach_o_canonicalize_non_scattered_reloc (abfd, &reloc, res, syms))

    return false;

  switch (reloc.r_type)

    {

    case BFD_MACH_O_ARM64_RELOC_UNSIGNED:

      switch ((reloc.r_length << 1) | reloc.r_pcrel)

  {

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

    res->howto = &arm64_howto_table[3];

    return true;

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

    res->howto = &arm64_howto_table[2];

    return true;

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

    res->howto = &arm64_howto_table[6];

    return true;

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

    res->howto = &arm64_howto_table[1];

    return true;

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

    res->howto = &arm64_howto_table[5];

    return true;

  case 6: /* len = 3, pcrel = 0  */

    res->howto = &arm64_howto_table[0];

    return true;

  case 7: /* len = 3, pcrel = 1  */

    res->howto = &arm64_howto_table[4];

    return true;

  default:

    return false;

  }

      break;

    case BFD_MACH_O_ARM64_RELOC_SUBTRACTOR:

      if (reloc.r_pcrel)

  return false;

      switch (reloc.r_length)

  {

  case 2:

    res->howto = &arm64_howto_table[11];

    return true;

  case 3:

    res->howto = &arm64_howto_table[12];

    return true;

  default:

    return false;

  }

      break;

    case BFD_MACH_O_ARM64_RELOC_BRANCH26:

      if (reloc.r_length == 2 && reloc.r_pcrel == 1)

  {

    res->howto = &arm64_howto_table[7];

    return true;

  }

      break;

    case BFD_MACH_O_ARM64_RELOC_PAGE21:

      if (reloc.r_length == 2 && reloc.r_pcrel == 1)

  {

    res->howto = &arm64_howto_table[8];

    return true;

  }

      break;

    case BFD_MACH_O_ARM64_RELOC_PAGEOFF12:

      if (reloc.r_length == 2 && reloc.r_pcrel == 0)

  {

    res->howto = &arm64_howto_table[9];

    return true;

  }

      break;

    case BFD_MACH_O_ARM64_RELOC_GOT_LOAD_PAGE21:

      if (reloc.r_length == 2 && reloc.r_pcrel == 1)

  {

    res->howto = &arm64_howto_table[13];

    return true;

  }

      break;

    case BFD_MACH_O_ARM64_RELOC_GOT_LOAD_PAGEOFF12:

      if (reloc.r_length == 2 && reloc.r_pcrel == 0)

  {

    res->howto = &arm64_howto_table[14];

    return true;

  }

      break;

    case BFD_MACH_O_ARM64_RELOC_POINTER_TO_GOT:

      if (reloc.r_length == 2 && reloc.r_pcrel == 1)

  {

    res->howto = &arm64_howto_table[15];

    return true;

  }

      break;

    default:

      break;

    }

  return false;

}

static reloc_howto_type *

bfd_mach_o_arm64_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,

          bfd_reloc_code_real_type code)

{

  unsigned int i;

  for (i = 0;

       i < sizeof (arm64_howto_table) / sizeof (*arm64_howto_table);

       i++)

    if (code == arm64_howto_table[i].type)

      return &arm64_howto_table[i];

  return NULL;

}

static reloc_howto_type *

bfd_mach_o_arm64_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,

              const char *name ATTRIBUTE_UNUSED)

{

  return NULL;

}

#define TARGET_NAME   aarch64_mach_o_vec

#define TARGET_STRING   "mach-o-arm64"

#define TARGET_ARCHITECTURE bfd_arch_aarch64

#define TARGET_PAGESIZE   4096

#define TARGET_BIG_ENDIAN 0

#define TARGET_ARCHIVE    0

#define TARGET_PRIORITY   0

#include "mach-o-target.c"

#undef TARGET_NAME

#undef TARGET_STRING

#undef TARGET_ARCHIVE

#undef TARGET_PRIORITY