bfd/mach-o-aarch64.c - binutils-gdb - Git at Google

 /* AArch-64 Mach-O support for BFD.
    Copyright (C) 2015-2021 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, 4, 64, false, 0,
 	 complain_overflow_bitfield,
 	 NULL, "64",
 	 false, MINUS_ONE, MINUS_ONE, false),
   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),
   /* 4 */
   HOWTO (BFD_RELOC_64_PCREL, 0, 4, 64, true, 0,
 	 complain_overflow_bitfield,
 	 NULL, "DISP64",
 	 false, MINUS_ONE, MINUS_ONE, true),
   HOWTO (BFD_RELOC_32_PCREL, 0, 2, 32, true, 0,
 	 complain_overflow_bitfield,
 	 NULL, "DISP32",
 	 false, 0xffffffff, 0xffffffff, true),
   HOWTO (BFD_RELOC_16_PCREL, 0, 1, 16, true, 0,
 	 complain_overflow_bitfield,
 	 NULL, "DISP16",
 	 false, 0xffff, 0xffff, true),
   HOWTO (BFD_RELOC_AARCH64_CALL26, 0, 2, 26, true, 0,
 	 complain_overflow_bitfield,
 	 NULL, "BRANCH26",
 	 false, 0x03ffffff, 0x03ffffff, true),
   /* 8 */
   HOWTO (BFD_RELOC_AARCH64_ADR_HI21_PCREL, 12, 2, 21, true, 0,
 	 complain_overflow_signed,
 	 NULL, "PAGE21",
 	 false, 0x1fffff, 0x1fffff, true),
   HOWTO (BFD_RELOC_AARCH64_LDST16_LO12, 1, 2, 12, true, 0,
 	 complain_overflow_signed,
 	 NULL, "PGOFF12",
 	 false, 0xffe, 0xffe, true),
   HOWTO (BFD_RELOC_MACH_O_ARM64_ADDEND, 0, 2, 32, false, 0,
 	 complain_overflow_signed,
 	 NULL, "ADDEND",
 	 false, 0xffffffff, 0xffffffff, false),
   HOWTO (BFD_RELOC_MACH_O_SUBTRACTOR32, 0, 2, 32, false, 0,
 	 complain_overflow_bitfield,
 	 NULL, "SUBTRACTOR32",
 	 false, 0xffffffff, 0xffffffff, false),
   /* 12 */
   HOWTO (BFD_RELOC_MACH_O_SUBTRACTOR64, 0, 4, 64, false, 0,
 	 complain_overflow_bitfield,
 	 NULL, "SUBTRACTOR64",
 	 false, MINUS_ONE, MINUS_ONE, false),
   HOWTO (BFD_RELOC_MACH_O_ARM64_GOT_LOAD_PAGE21, 12, 2, 21, true, 0,
 	 complain_overflow_signed,
 	 NULL, "GOT_LD_PG21",
 	 false, 0x1fffff, 0x1fffff, true),
   HOWTO (BFD_RELOC_MACH_O_ARM64_GOT_LOAD_PAGEOFF12, 1, 2, 12, true, 0,
 	 complain_overflow_signed,
 	 NULL, "GOT_LD_PGOFF12",
 	 false, 0xffe, 0xffe, true),
   HOWTO (BFD_RELOC_MACH_O_ARM64_POINTER_TO_GOT, 0, 2, 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_ptr_ptr;
 	  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
	/* AArch-64 Mach-O support for BFD.
	Copyright (C) 2015-2021 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, 4, 64, false, 0,
	complain_overflow_bitfield,
	NULL, "64",
	false, MINUS_ONE, MINUS_ONE, false),
	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),
	/* 4 */
	HOWTO (BFD_RELOC_64_PCREL, 0, 4, 64, true, 0,
	complain_overflow_bitfield,
	NULL, "DISP64",
	false, MINUS_ONE, MINUS_ONE, true),
	HOWTO (BFD_RELOC_32_PCREL, 0, 2, 32, true, 0,
	complain_overflow_bitfield,
	NULL, "DISP32",
	false, 0xffffffff, 0xffffffff, true),
	HOWTO (BFD_RELOC_16_PCREL, 0, 1, 16, true, 0,
	complain_overflow_bitfield,
	NULL, "DISP16",
	false, 0xffff, 0xffff, true),
	HOWTO (BFD_RELOC_AARCH64_CALL26, 0, 2, 26, true, 0,
	complain_overflow_bitfield,
	NULL, "BRANCH26",
	false, 0x03ffffff, 0x03ffffff, true),
	/* 8 */
	HOWTO (BFD_RELOC_AARCH64_ADR_HI21_PCREL, 12, 2, 21, true, 0,
	complain_overflow_signed,
	NULL, "PAGE21",
	false, 0x1fffff, 0x1fffff, true),
	HOWTO (BFD_RELOC_AARCH64_LDST16_LO12, 1, 2, 12, true, 0,
	complain_overflow_signed,
	NULL, "PGOFF12",
	false, 0xffe, 0xffe, true),
	HOWTO (BFD_RELOC_MACH_O_ARM64_ADDEND, 0, 2, 32, false, 0,
	complain_overflow_signed,
	NULL, "ADDEND",
	false, 0xffffffff, 0xffffffff, false),
	HOWTO (BFD_RELOC_MACH_O_SUBTRACTOR32, 0, 2, 32, false, 0,
	complain_overflow_bitfield,
	NULL, "SUBTRACTOR32",
	false, 0xffffffff, 0xffffffff, false),
	/* 12 */
	HOWTO (BFD_RELOC_MACH_O_SUBTRACTOR64, 0, 4, 64, false, 0,
	complain_overflow_bitfield,
	NULL, "SUBTRACTOR64",
	false, MINUS_ONE, MINUS_ONE, false),
	HOWTO (BFD_RELOC_MACH_O_ARM64_GOT_LOAD_PAGE21, 12, 2, 21, true, 0,
	complain_overflow_signed,
	NULL, "GOT_LD_PG21",
	false, 0x1fffff, 0x1fffff, true),
	HOWTO (BFD_RELOC_MACH_O_ARM64_GOT_LOAD_PAGEOFF12, 1, 2, 12, true, 0,
	complain_overflow_signed,
	NULL, "GOT_LD_PGOFF12",
	false, 0xffe, 0xffe, true),
	HOWTO (BFD_RELOC_MACH_O_ARM64_POINTER_TO_GOT, 0, 2, 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_ptr_ptr;
	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