416 lines
12 KiB
C
416 lines
12 KiB
C
/* Intel i386 Mach-O support for BFD.
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Copyright (C) 2009-2022 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/reloc.h"
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#define bfd_mach_o_object_p bfd_mach_o_i386_object_p
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#define bfd_mach_o_core_p bfd_mach_o_i386_core_p
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#define bfd_mach_o_mkobject bfd_mach_o_i386_mkobject
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static bfd_cleanup
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bfd_mach_o_i386_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_I386);
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}
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static bfd_cleanup
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bfd_mach_o_i386_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_I386);
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}
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static bool
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bfd_mach_o_i386_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_I386;
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mdata->header.cpusubtype = BFD_MACH_O_CPU_SUBTYPE_X86_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 i386_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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};
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static bool
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bfd_mach_o_i386_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_GENERIC_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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return false;
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if (reloc.r_length == 2)
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{
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res->howto = &i386_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 = &i386_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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return false;
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case BFD_MACH_O_GENERIC_RELOC_SECTDIFF:
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if (reloc.r_length == 2)
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{
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res->howto = &i386_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 = &i386_howto_table[8];
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return true;
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}
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return false;
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case BFD_MACH_O_GENERIC_RELOC_LOCAL_SECTDIFF:
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if (reloc.r_length == 2)
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{
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res->howto = &i386_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 = &i386_howto_table[9];
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return true;
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}
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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_GENERIC_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 = &i386_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 = &i386_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 = &i386_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 = &i386_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 = &i386_howto_table[3];
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return true;
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default:
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return false;
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}
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default:
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break;
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}
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}
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return false;
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}
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static bool
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bfd_mach_o_i386_swap_reloc_out (arelent *rel, bfd_mach_o_reloc_info *rinfo)
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{
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rinfo->r_address = rel->address;
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switch (rel->howto->type)
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{
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case BFD_RELOC_32:
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case BFD_RELOC_32_PCREL:
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case BFD_RELOC_16:
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case BFD_RELOC_16_PCREL:
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case BFD_RELOC_8:
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rinfo->r_scattered = 0;
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rinfo->r_type = BFD_MACH_O_GENERIC_RELOC_VANILLA;
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rinfo->r_pcrel = rel->howto->pc_relative;
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rinfo->r_length = rel->howto->size; /* Correct in practice. */
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if ((*rel->sym_ptr_ptr)->flags & BSF_SECTION_SYM)
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{
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rinfo->r_extern = 0;
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rinfo->r_value =
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(*rel->sym_ptr_ptr)->section->output_section->target_index;
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}
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else
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{
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rinfo->r_extern = 1;
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rinfo->r_value = (*rel->sym_ptr_ptr)->udata.i;
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}
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break;
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case BFD_RELOC_MACH_O_SECTDIFF:
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rinfo->r_scattered = 1;
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rinfo->r_type = BFD_MACH_O_GENERIC_RELOC_SECTDIFF;
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rinfo->r_pcrel = 0;
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rinfo->r_length = rel->howto->size;
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rinfo->r_extern = 0;
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rinfo->r_value = rel->addend;
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break;
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case BFD_RELOC_MACH_O_LOCAL_SECTDIFF:
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rinfo->r_scattered = 1;
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rinfo->r_type = BFD_MACH_O_GENERIC_RELOC_LOCAL_SECTDIFF;
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rinfo->r_pcrel = 0;
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rinfo->r_length = rel->howto->size;
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rinfo->r_extern = 0;
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rinfo->r_value = rel->addend;
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break;
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case BFD_RELOC_MACH_O_PAIR:
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rinfo->r_address = 0;
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rinfo->r_scattered = 1;
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rinfo->r_type = BFD_MACH_O_GENERIC_RELOC_PAIR;
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rinfo->r_pcrel = 0;
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rinfo->r_length = rel->howto->size;
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rinfo->r_extern = 0;
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rinfo->r_value = rel->addend;
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break;
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default:
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return false;
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}
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return true;
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}
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static reloc_howto_type *
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bfd_mach_o_i386_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 (i386_howto_table) / sizeof (*i386_howto_table); i++)
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if (code == i386_howto_table[i].type)
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return &i386_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_i386_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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static bool
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bfd_mach_o_i386_print_thread (bfd *abfd, bfd_mach_o_thread_flavour *thread,
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void *vfile, char *buf)
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{
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FILE *file = (FILE *)vfile;
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switch (thread->flavour)
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{
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case BFD_MACH_O_x86_THREAD_STATE:
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if (thread->size < (8 + 16 * 4))
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return false;
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fprintf (file, " x86_THREAD_STATE:\n");
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fprintf (file, " flavor: 0x%08lx count: 0x%08lx\n",
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(unsigned long)bfd_get_32 (abfd, buf + 0),
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(unsigned long)bfd_get_32 (abfd, buf + 4));
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fprintf (file, " eax: %08lx ebx: %08lx ecx: %08lx edx: %08lx\n",
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(unsigned long)bfd_get_32 (abfd, buf + 8),
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(unsigned long)bfd_get_32 (abfd, buf + 12),
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(unsigned long)bfd_get_32 (abfd, buf + 16),
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(unsigned long)bfd_get_32 (abfd, buf + 20));
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fprintf (file, " edi: %08lx esi: %08lx ebp: %08lx esp: %08lx\n",
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(unsigned long)bfd_get_32 (abfd, buf + 24),
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(unsigned long)bfd_get_32 (abfd, buf + 28),
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(unsigned long)bfd_get_32 (abfd, buf + 32),
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(unsigned long)bfd_get_32 (abfd, buf + 36));
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fprintf (file, " ss: %08lx flg: %08lx eip: %08lx cs: %08lx\n",
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(unsigned long)bfd_get_32 (abfd, buf + 40),
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(unsigned long)bfd_get_32 (abfd, buf + 44),
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(unsigned long)bfd_get_32 (abfd, buf + 48),
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(unsigned long)bfd_get_32 (abfd, buf + 52));
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fprintf (file, " ds: %08lx es: %08lx fs: %08lx gs: %08lx\n",
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(unsigned long)bfd_get_32 (abfd, buf + 56),
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(unsigned long)bfd_get_32 (abfd, buf + 60),
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(unsigned long)bfd_get_32 (abfd, buf + 64),
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(unsigned long)bfd_get_32 (abfd, buf + 68));
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return true;
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case BFD_MACH_O_x86_FLOAT_STATE:
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if (thread->size < 8)
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return false;
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fprintf (file, " x86_FLOAT_STATE:\n");
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fprintf (file, " flavor: 0x%08lx count: 0x%08lx\n",
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(unsigned long)bfd_get_32 (abfd, buf + 0),
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(unsigned long)bfd_get_32 (abfd, buf + 4));
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return true;
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case BFD_MACH_O_x86_EXCEPTION_STATE:
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if (thread->size < 8 + 3 * 4)
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return false;
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fprintf (file, " x86_EXCEPTION_STATE:\n");
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fprintf (file, " flavor: 0x%08lx count: 0x%08lx\n",
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(unsigned long)bfd_get_32 (abfd, buf + 0),
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(unsigned long)bfd_get_32 (abfd, buf + 4));
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fprintf (file, " trapno: %08lx err: %08lx faultaddr: %08lx\n",
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(unsigned long)bfd_get_32 (abfd, buf + 8),
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(unsigned long)bfd_get_32 (abfd, buf + 12),
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(unsigned long)bfd_get_32 (abfd, buf + 16));
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return true;
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default:
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break;
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}
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return false;
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}
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static const mach_o_section_name_xlat text_section_names_xlat[] =
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{
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{ ".symbol_stub", "__symbol_stub",
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SEC_CODE | SEC_LOAD, BFD_MACH_O_S_SYMBOL_STUBS,
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BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS,
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0},
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{ ".picsymbol_stub", "__picsymbol_stub",
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SEC_CODE | SEC_LOAD, BFD_MACH_O_S_SYMBOL_STUBS,
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BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS,
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0},
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{ NULL, NULL, 0, 0, 0, 0}
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};
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static const mach_o_section_name_xlat data_section_names_xlat[] =
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{
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/* The first two are recognized by i386, but not emitted for x86 by
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modern GCC. */
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{ ".non_lazy_symbol_pointer", "__nl_symbol_ptr",
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SEC_DATA | SEC_LOAD, BFD_MACH_O_S_NON_LAZY_SYMBOL_POINTERS,
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BFD_MACH_O_S_ATTR_NONE, 2},
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{ ".lazy_symbol_pointer", "__la_symbol_ptr",
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SEC_DATA | SEC_LOAD, BFD_MACH_O_S_LAZY_SYMBOL_POINTERS,
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BFD_MACH_O_S_ATTR_NONE, 2},
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{ ".lazy_symbol_pointer2", "__la_sym_ptr2",
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SEC_DATA | SEC_LOAD, BFD_MACH_O_S_LAZY_SYMBOL_POINTERS,
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BFD_MACH_O_S_ATTR_NONE, 2},
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{ ".lazy_symbol_pointer3", "__la_sym_ptr3",
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SEC_DATA | SEC_LOAD, BFD_MACH_O_S_LAZY_SYMBOL_POINTERS,
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BFD_MACH_O_S_ATTR_NONE, 2},
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{ NULL, NULL, 0, 0, 0, 0}
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};
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static const mach_o_section_name_xlat import_section_names_xlat[] =
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{
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{ ".picsymbol_stub3", "__jump_table",
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SEC_CODE | SEC_LOAD, BFD_MACH_O_S_SYMBOL_STUBS,
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BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS
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| BFD_MACH_O_S_SELF_MODIFYING_CODE,
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6},
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{ ".non_lazy_symbol_pointer_x86", "__pointers",
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SEC_DATA | SEC_LOAD, BFD_MACH_O_S_NON_LAZY_SYMBOL_POINTERS,
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BFD_MACH_O_S_ATTR_NONE, 2},
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{ NULL, NULL, 0, 0, 0, 0}
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};
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const mach_o_segment_name_xlat mach_o_i386_segsec_names_xlat[] =
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{
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{ "__TEXT", text_section_names_xlat },
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{ "__DATA", data_section_names_xlat },
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{ "__IMPORT", import_section_names_xlat },
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{ NULL, NULL }
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};
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#define bfd_mach_o_canonicalize_one_reloc bfd_mach_o_i386_canonicalize_one_reloc
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#define bfd_mach_o_swap_reloc_out bfd_mach_o_i386_swap_reloc_out
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#define bfd_mach_o_print_thread bfd_mach_o_i386_print_thread
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#define bfd_mach_o_tgt_seg_table mach_o_i386_segsec_names_xlat
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#define bfd_mach_o_section_type_valid_for_tgt NULL
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#define bfd_mach_o_bfd_reloc_type_lookup bfd_mach_o_i386_bfd_reloc_type_lookup
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#define bfd_mach_o_bfd_reloc_name_lookup bfd_mach_o_i386_bfd_reloc_name_lookup
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#define TARGET_NAME i386_mach_o_vec
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#define TARGET_STRING "mach-o-i386"
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#define TARGET_ARCHITECTURE bfd_arch_i386
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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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