363 lines
10 KiB
C
363 lines
10 KiB
C
/* ARM Mach-O support for BFD.
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Copyright (C) 2015-2022 Free Software Foundation, Inc.
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "sysdep.h"
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#include "bfd.h"
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#include "libbfd.h"
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#include "libiberty.h"
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#include "mach-o.h"
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#include "mach-o/arm.h"
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#define bfd_mach_o_object_p bfd_mach_o_arm_object_p
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#define bfd_mach_o_core_p bfd_mach_o_arm_core_p
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#define bfd_mach_o_mkobject bfd_mach_o_arm_mkobject
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#define bfd_mach_o_canonicalize_one_reloc bfd_mach_o_arm_canonicalize_one_reloc
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#define bfd_mach_o_swap_reloc_out NULL
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#define bfd_mach_o_bfd_reloc_type_lookup bfd_mach_o_arm_bfd_reloc_type_lookup
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#define bfd_mach_o_bfd_reloc_name_lookup bfd_mach_o_arm_bfd_reloc_name_lookup
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#define bfd_mach_o_print_thread NULL
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#define bfd_mach_o_tgt_seg_table NULL
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#define bfd_mach_o_section_type_valid_for_tgt NULL
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static bfd_cleanup
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bfd_mach_o_arm_object_p (bfd *abfd)
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{
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return bfd_mach_o_header_p (abfd, 0, 0, BFD_MACH_O_CPU_TYPE_ARM);
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}
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static bfd_cleanup
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bfd_mach_o_arm_core_p (bfd *abfd)
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{
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return bfd_mach_o_header_p (abfd, 0,
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BFD_MACH_O_MH_CORE, BFD_MACH_O_CPU_TYPE_ARM);
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}
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static bool
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bfd_mach_o_arm_mkobject (bfd *abfd)
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{
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bfd_mach_o_data_struct *mdata;
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if (!bfd_mach_o_mkobject_init (abfd))
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return false;
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mdata = bfd_mach_o_get_data (abfd);
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mdata->header.magic = BFD_MACH_O_MH_MAGIC;
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mdata->header.cputype = BFD_MACH_O_CPU_TYPE_ARM;
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mdata->header.cpusubtype = BFD_MACH_O_CPU_SUBTYPE_ARM_ALL;
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mdata->header.byteorder = BFD_ENDIAN_LITTLE;
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mdata->header.version = 1;
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return true;
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}
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static reloc_howto_type arm_howto_table[]=
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{
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/* 0 */
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HOWTO (BFD_RELOC_32, 0, 2, 32, false, 0,
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complain_overflow_bitfield,
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NULL, "32",
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false, 0xffffffff, 0xffffffff, false),
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HOWTO (BFD_RELOC_16, 0, 1, 16, false, 0,
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complain_overflow_bitfield,
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NULL, "16",
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false, 0xffff, 0xffff, false),
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HOWTO (BFD_RELOC_8, 0, 0, 8, false, 0,
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complain_overflow_bitfield,
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NULL, "8",
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false, 0xff, 0xff, false),
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HOWTO (BFD_RELOC_32_PCREL, 0, 2, 32, true, 0,
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complain_overflow_bitfield,
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NULL, "DISP32",
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false, 0xffffffff, 0xffffffff, true),
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/* 4 */
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HOWTO (BFD_RELOC_16_PCREL, 0, 1, 16, true, 0,
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complain_overflow_bitfield,
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NULL, "DISP16",
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false, 0xffff, 0xffff, true),
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HOWTO (BFD_RELOC_MACH_O_SECTDIFF, 0, 2, 32, false, 0,
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complain_overflow_bitfield,
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NULL, "SECTDIFF_32",
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false, 0xffffffff, 0xffffffff, false),
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HOWTO (BFD_RELOC_MACH_O_LOCAL_SECTDIFF, 0, 2, 32, false, 0,
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complain_overflow_bitfield,
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NULL, "LSECTDIFF_32",
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false, 0xffffffff, 0xffffffff, false),
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HOWTO (BFD_RELOC_MACH_O_PAIR, 0, 2, 32, false, 0,
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complain_overflow_bitfield,
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NULL, "PAIR_32",
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false, 0xffffffff, 0xffffffff, false),
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/* 8 */
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HOWTO (BFD_RELOC_MACH_O_SECTDIFF, 0, 1, 16, false, 0,
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complain_overflow_bitfield,
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NULL, "SECTDIFF_16",
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false, 0xffff, 0xffff, false),
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HOWTO (BFD_RELOC_MACH_O_LOCAL_SECTDIFF, 0, 1, 16, false, 0,
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complain_overflow_bitfield,
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NULL, "LSECTDIFF_16",
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false, 0xffff, 0xffff, false),
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HOWTO (BFD_RELOC_MACH_O_PAIR, 0, 1, 16, false, 0,
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complain_overflow_bitfield,
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NULL, "PAIR_16",
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false, 0xffff, 0xffff, false),
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HOWTO (BFD_RELOC_ARM_PCREL_CALL, 2, 2, 24, true, 0,
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complain_overflow_signed,
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NULL, "BR24",
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false, 0x00ffffff, 0x00ffffff, true),
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/* 12 */
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HOWTO (BFD_RELOC_ARM_MOVW, 0, 2, 16, false, 0,
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complain_overflow_dont,
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NULL, "MOVW",
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false, 0x000f0fff, 0x000f0fff, false),
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HOWTO (BFD_RELOC_MACH_O_PAIR, 0, 2, 16, false, 0,
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complain_overflow_bitfield,
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NULL, "PAIR_W",
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false, 0x000f0fff, 0x000f0fff, false),
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HOWTO (BFD_RELOC_ARM_MOVT, 0, 2, 16, false, 0,
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complain_overflow_bitfield,
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NULL, "MOVT",
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false, 0x000f0fff, 0x000f0fff, false),
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HOWTO (BFD_RELOC_MACH_O_PAIR, 0, 2, 16, false, 0,
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complain_overflow_bitfield,
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NULL, "PAIR_T",
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false, 0x000f0fff, 0x000f0fff, false),
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/* 16 */
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HOWTO (BFD_RELOC_THUMB_PCREL_BLX, 2, 2, 24, true, 0,
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complain_overflow_signed,
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NULL, "TBR22",
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false, 0x07ff2fff, 0x07ff2fff, true)
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};
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static bool
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bfd_mach_o_arm_canonicalize_one_reloc (bfd * abfd,
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struct mach_o_reloc_info_external * raw,
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arelent * res,
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asymbol ** syms,
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arelent * res_base)
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{
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bfd_mach_o_reloc_info reloc;
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if (!bfd_mach_o_pre_canonicalize_one_reloc (abfd, raw, &reloc, res, syms))
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return false;
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if (reloc.r_scattered)
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{
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switch (reloc.r_type)
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{
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case BFD_MACH_O_ARM_RELOC_PAIR:
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/* PR 21813: Check for a corrupt PAIR reloc at the start. */
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if (res == res_base)
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{
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_bfd_error_handler (_("malformed mach-o ARM reloc pair: "
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"reloc is first reloc"));
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return false;
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}
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if (reloc.r_length == 2)
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{
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res->howto = &arm_howto_table[7];
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res->address = res[-1].address;
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return true;
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}
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else if (reloc.r_length == 1)
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{
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res->howto = &arm_howto_table[10];
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res->address = res[-1].address;
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return true;
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}
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_bfd_error_handler (_("malformed mach-o ARM reloc pair: "
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"invalid length: %d"), reloc.r_length);
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return false;
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case BFD_MACH_O_ARM_RELOC_SECTDIFF:
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if (reloc.r_length == 2)
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{
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res->howto = &arm_howto_table[5];
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return true;
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}
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else if (reloc.r_length == 1)
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{
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res->howto = &arm_howto_table[8];
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return true;
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}
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_bfd_error_handler (_("malformed mach-o ARM sectdiff reloc: "
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"invalid length: %d"), reloc.r_length);
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return false;
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case BFD_MACH_O_ARM_RELOC_LOCAL_SECTDIFF:
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if (reloc.r_length == 2)
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{
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res->howto = &arm_howto_table[6];
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return true;
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}
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else if (reloc.r_length == 1)
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{
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res->howto = &arm_howto_table[9];
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return true;
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}
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_bfd_error_handler (_("malformed mach-o ARM local sectdiff reloc: "
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"invalid length: %d"),
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reloc.r_length);
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return false;
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case BFD_MACH_O_ARM_RELOC_HALF_SECTDIFF:
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switch (reloc.r_length)
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{
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case 2: /* :lower16: for movw arm. */
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res->howto = &arm_howto_table[12];
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return true;
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case 3: /* :upper16: for movt arm. */
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res->howto = &arm_howto_table[14];
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return true;
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}
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_bfd_error_handler (_("malformed mach-o ARM half sectdiff reloc: "
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"invalid length: %d"),
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reloc.r_length);
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return false;
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default:
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break;
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}
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}
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else
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{
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switch (reloc.r_type)
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{
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case BFD_MACH_O_ARM_RELOC_VANILLA:
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switch ((reloc.r_length << 1) | reloc.r_pcrel)
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{
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case 0: /* len = 0, pcrel = 0 */
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res->howto = &arm_howto_table[2];
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return true;
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case 2: /* len = 1, pcrel = 0 */
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res->howto = &arm_howto_table[1];
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return true;
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case 3: /* len = 1, pcrel = 1 */
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res->howto = &arm_howto_table[4];
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return true;
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case 4: /* len = 2, pcrel = 0 */
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res->howto = &arm_howto_table[0];
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return true;
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case 5: /* len = 2, pcrel = 1 */
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res->howto = &arm_howto_table[3];
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return true;
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default:
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_bfd_error_handler (_("malformed mach-o ARM vanilla reloc: "
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"invalid length: %d (pcrel: %d)"),
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reloc.r_length, reloc.r_pcrel);
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return false;
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}
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break;
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case BFD_MACH_O_ARM_RELOC_BR24:
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if (reloc.r_length == 2 && reloc.r_pcrel == 1)
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{
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res->howto = &arm_howto_table[11];
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return true;
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}
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break;
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case BFD_MACH_O_THUMB_RELOC_BR22:
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if (reloc.r_length == 2 && reloc.r_pcrel == 1)
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{
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res->howto = &arm_howto_table[16];
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return true;
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}
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break;
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case BFD_MACH_O_ARM_RELOC_HALF:
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if (reloc.r_pcrel == 0)
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switch (reloc.r_length)
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{
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case 0: /* :lower16: for movw arm. */
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res->howto = &arm_howto_table[12];
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return true;
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case 1: /* :upper16: for movt arm. */
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res->howto = &arm_howto_table[14];
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return true;
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}
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break;
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case BFD_MACH_O_ARM_RELOC_PAIR:
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if (res == res_base)
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{
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_bfd_error_handler (_("malformed mach-o ARM reloc pair: "
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"reloc is first reloc"));
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return false;
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}
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if (res[-1].howto == &arm_howto_table[12]
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&& reloc.r_length == 0)
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{
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/* Pair for :lower16: of movw arm. */
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res->howto = &arm_howto_table[13];
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/* This reloc contains the other half in its r_address field. */
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res[-1].addend += (res->address & 0xffff) << 16;
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res->address = res[-1].address;
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return true;
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}
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else if (res[-1].howto == &arm_howto_table[14]
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&& reloc.r_length == 1)
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{
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/* Pair for :upper16: of movt arm. */
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res->howto = &arm_howto_table[15];
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/* This reloc contains the other half in its r_address field. */
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res[-1].addend += res->address & 0xffff;
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res->address = res[-1].address;
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return true;
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}
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break;
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default:
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break;
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}
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}
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_bfd_error_handler (_("malformed mach-o ARM reloc: "
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"unknown reloc type: %d"), reloc.r_length);
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return false;
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}
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static reloc_howto_type *
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bfd_mach_o_arm_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
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bfd_reloc_code_real_type code)
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{
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unsigned int i;
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for (i = 0; i < sizeof (arm_howto_table) / sizeof (*arm_howto_table); i++)
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if (code == arm_howto_table[i].type)
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return &arm_howto_table[i];
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return NULL;
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}
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static reloc_howto_type *
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bfd_mach_o_arm_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
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const char *name ATTRIBUTE_UNUSED)
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{
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return NULL;
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}
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#define TARGET_NAME arm_mach_o_vec
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#define TARGET_STRING "mach-o-arm"
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#define TARGET_ARCHITECTURE bfd_arch_arm
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#define TARGET_PAGESIZE 4096
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#define TARGET_BIG_ENDIAN 0
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#define TARGET_ARCHIVE 0
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#define TARGET_PRIORITY 0
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#include "mach-o-target.c"
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