3890 lines
114 KiB
C
3890 lines
114 KiB
C
/* X86-64 specific support for 64-bit ELF
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Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
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Free Software Foundation, Inc.
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Contributed by Jan Hubicka <jh@suse.cz>.
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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 "bfdlink.h"
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#include "libbfd.h"
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#include "elf-bfd.h"
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#include "bfd_stdint.h"
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#include "elf/x86-64.h"
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/* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
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#define MINUS_ONE (~ (bfd_vma) 0)
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/* The relocation "howto" table. Order of fields:
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type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
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special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
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static reloc_howto_type x86_64_elf_howto_table[] =
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{
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HOWTO(R_X86_64_NONE, 0, 0, 0, FALSE, 0, complain_overflow_dont,
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bfd_elf_generic_reloc, "R_X86_64_NONE", FALSE, 0x00000000, 0x00000000,
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FALSE),
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HOWTO(R_X86_64_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_X86_64_64", FALSE, MINUS_ONE, MINUS_ONE,
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FALSE),
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HOWTO(R_X86_64_PC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
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bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff,
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TRUE),
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HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
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bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff,
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FALSE),
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HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
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bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff,
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TRUE),
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HOWTO(R_X86_64_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_X86_64_COPY", FALSE, 0xffffffff, 0xffffffff,
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FALSE),
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HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", FALSE, MINUS_ONE,
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MINUS_ONE, FALSE),
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HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", FALSE, MINUS_ONE,
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MINUS_ONE, FALSE),
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HOWTO(R_X86_64_RELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_X86_64_RELATIVE", FALSE, MINUS_ONE,
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MINUS_ONE, FALSE),
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HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed,
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bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff,
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0xffffffff, TRUE),
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HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
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bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
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FALSE),
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HOWTO(R_X86_64_32S, 0, 2, 32, FALSE, 0, complain_overflow_signed,
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bfd_elf_generic_reloc, "R_X86_64_32S", FALSE, 0xffffffff, 0xffffffff,
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FALSE),
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HOWTO(R_X86_64_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_X86_64_16", FALSE, 0xffff, 0xffff, FALSE),
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HOWTO(R_X86_64_PC16,0, 1, 16, TRUE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_X86_64_PC16", FALSE, 0xffff, 0xffff, TRUE),
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HOWTO(R_X86_64_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_X86_64_8", FALSE, 0xff, 0xff, FALSE),
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HOWTO(R_X86_64_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
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bfd_elf_generic_reloc, "R_X86_64_PC8", FALSE, 0xff, 0xff, TRUE),
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HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE,
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MINUS_ONE, FALSE),
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HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE,
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MINUS_ONE, FALSE),
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HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE,
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MINUS_ONE, FALSE),
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HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
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bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff,
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0xffffffff, TRUE),
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HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
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bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff,
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0xffffffff, TRUE),
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HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
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bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff,
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0xffffffff, FALSE),
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HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed,
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bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff,
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0xffffffff, TRUE),
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HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
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bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff,
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0xffffffff, FALSE),
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HOWTO(R_X86_64_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_X86_64_PC64", FALSE, MINUS_ONE, MINUS_ONE,
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TRUE),
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HOWTO(R_X86_64_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_X86_64_GOTOFF64",
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FALSE, MINUS_ONE, MINUS_ONE, FALSE),
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HOWTO(R_X86_64_GOTPC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
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bfd_elf_generic_reloc, "R_X86_64_GOTPC32",
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FALSE, 0xffffffff, 0xffffffff, TRUE),
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HOWTO(R_X86_64_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
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bfd_elf_generic_reloc, "R_X86_64_GOT64", FALSE, MINUS_ONE, MINUS_ONE,
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FALSE),
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HOWTO(R_X86_64_GOTPCREL64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
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bfd_elf_generic_reloc, "R_X86_64_GOTPCREL64", FALSE, MINUS_ONE,
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MINUS_ONE, TRUE),
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HOWTO(R_X86_64_GOTPC64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
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bfd_elf_generic_reloc, "R_X86_64_GOTPC64",
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FALSE, MINUS_ONE, MINUS_ONE, TRUE),
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HOWTO(R_X86_64_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
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bfd_elf_generic_reloc, "R_X86_64_GOTPLT64", FALSE, MINUS_ONE,
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MINUS_ONE, FALSE),
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HOWTO(R_X86_64_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
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bfd_elf_generic_reloc, "R_X86_64_PLTOFF64", FALSE, MINUS_ONE,
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MINUS_ONE, FALSE),
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EMPTY_HOWTO (32),
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EMPTY_HOWTO (33),
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HOWTO(R_X86_64_GOTPC32_TLSDESC, 0, 2, 32, TRUE, 0,
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complain_overflow_bitfield, bfd_elf_generic_reloc,
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"R_X86_64_GOTPC32_TLSDESC",
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FALSE, 0xffffffff, 0xffffffff, TRUE),
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HOWTO(R_X86_64_TLSDESC_CALL, 0, 0, 0, FALSE, 0,
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complain_overflow_dont, bfd_elf_generic_reloc,
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"R_X86_64_TLSDESC_CALL",
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FALSE, 0, 0, FALSE),
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HOWTO(R_X86_64_TLSDESC, 0, 4, 64, FALSE, 0,
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complain_overflow_bitfield, bfd_elf_generic_reloc,
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"R_X86_64_TLSDESC",
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FALSE, MINUS_ONE, MINUS_ONE, FALSE),
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/* We have a gap in the reloc numbers here.
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R_X86_64_standard counts the number up to this point, and
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R_X86_64_vt_offset is the value to subtract from a reloc type of
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R_X86_64_GNU_VT* to form an index into this table. */
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#define R_X86_64_standard (R_X86_64_TLSDESC + 1)
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#define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
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/* GNU extension to record C++ vtable hierarchy. */
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HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont,
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NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE),
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/* GNU extension to record C++ vtable member usage. */
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HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont,
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_bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0,
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FALSE)
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};
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/* Map BFD relocs to the x86_64 elf relocs. */
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struct elf_reloc_map
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{
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bfd_reloc_code_real_type bfd_reloc_val;
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unsigned char elf_reloc_val;
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};
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static const struct elf_reloc_map x86_64_reloc_map[] =
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{
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{ BFD_RELOC_NONE, R_X86_64_NONE, },
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{ BFD_RELOC_64, R_X86_64_64, },
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{ BFD_RELOC_32_PCREL, R_X86_64_PC32, },
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{ BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,},
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{ BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,},
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{ BFD_RELOC_X86_64_COPY, R_X86_64_COPY, },
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{ BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, },
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{ BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, },
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{ BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, },
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{ BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, },
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{ BFD_RELOC_32, R_X86_64_32, },
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{ BFD_RELOC_X86_64_32S, R_X86_64_32S, },
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{ BFD_RELOC_16, R_X86_64_16, },
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{ BFD_RELOC_16_PCREL, R_X86_64_PC16, },
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{ BFD_RELOC_8, R_X86_64_8, },
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{ BFD_RELOC_8_PCREL, R_X86_64_PC8, },
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{ BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, },
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{ BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, },
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{ BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, },
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{ BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, },
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{ BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, },
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{ BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, },
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{ BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, },
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{ BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, },
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{ BFD_RELOC_64_PCREL, R_X86_64_PC64, },
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{ BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, },
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{ BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, },
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{ BFD_RELOC_X86_64_GOT64, R_X86_64_GOT64, },
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{ BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, },
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{ BFD_RELOC_X86_64_GOTPC64, R_X86_64_GOTPC64, },
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{ BFD_RELOC_X86_64_GOTPLT64, R_X86_64_GOTPLT64, },
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{ BFD_RELOC_X86_64_PLTOFF64, R_X86_64_PLTOFF64, },
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{ BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, },
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{ BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, },
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{ BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, },
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{ BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, },
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{ BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, },
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};
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static reloc_howto_type *
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elf64_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type)
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{
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unsigned i;
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if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT
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|| r_type >= (unsigned int) R_X86_64_max)
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{
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if (r_type >= (unsigned int) R_X86_64_standard)
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{
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(*_bfd_error_handler) (_("%B: invalid relocation type %d"),
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abfd, (int) r_type);
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r_type = R_X86_64_NONE;
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}
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i = r_type;
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}
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else
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i = r_type - (unsigned int) R_X86_64_vt_offset;
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BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type);
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return &x86_64_elf_howto_table[i];
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}
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/* Given a BFD reloc type, return a HOWTO structure. */
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static reloc_howto_type *
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elf64_x86_64_reloc_type_lookup (bfd *abfd,
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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 (x86_64_reloc_map) / sizeof (struct elf_reloc_map);
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i++)
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{
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if (x86_64_reloc_map[i].bfd_reloc_val == code)
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return elf64_x86_64_rtype_to_howto (abfd,
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x86_64_reloc_map[i].elf_reloc_val);
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}
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return 0;
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}
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static reloc_howto_type *
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elf64_x86_64_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
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const char *r_name)
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{
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unsigned int i;
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for (i = 0;
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i < (sizeof (x86_64_elf_howto_table)
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/ sizeof (x86_64_elf_howto_table[0]));
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i++)
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if (x86_64_elf_howto_table[i].name != NULL
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&& strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0)
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return &x86_64_elf_howto_table[i];
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||
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return NULL;
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||
}
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||
|
||
/* Given an x86_64 ELF reloc type, fill in an arelent structure. */
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||
|
||
static void
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elf64_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
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Elf_Internal_Rela *dst)
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||
{
|
||
unsigned r_type;
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||
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r_type = ELF64_R_TYPE (dst->r_info);
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cache_ptr->howto = elf64_x86_64_rtype_to_howto (abfd, r_type);
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BFD_ASSERT (r_type == cache_ptr->howto->type);
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}
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||
|
||
/* Support for core dump NOTE sections. */
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||
static bfd_boolean
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elf64_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
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||
{
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||
int offset;
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||
size_t size;
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||
|
||
switch (note->descsz)
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||
{
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||
default:
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||
return FALSE;
|
||
|
||
case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
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||
/* pr_cursig */
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||
elf_tdata (abfd)->core_signal
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= bfd_get_16 (abfd, note->descdata + 12);
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||
|
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/* pr_pid */
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||
elf_tdata (abfd)->core_pid
|
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= bfd_get_32 (abfd, note->descdata + 32);
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||
|
||
/* pr_reg */
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offset = 112;
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size = 216;
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||
|
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break;
|
||
}
|
||
|
||
/* Make a ".reg/999" section. */
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return _bfd_elfcore_make_pseudosection (abfd, ".reg",
|
||
size, note->descpos + offset);
|
||
}
|
||
|
||
static bfd_boolean
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||
elf64_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
|
||
{
|
||
switch (note->descsz)
|
||
{
|
||
default:
|
||
return FALSE;
|
||
|
||
case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
|
||
elf_tdata (abfd)->core_program
|
||
= _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
|
||
elf_tdata (abfd)->core_command
|
||
= _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
|
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}
|
||
|
||
/* Note that for some reason, a spurious space is tacked
|
||
onto the end of the args in some (at least one anyway)
|
||
implementations, so strip it off if it exists. */
|
||
|
||
{
|
||
char *command = elf_tdata (abfd)->core_command;
|
||
int n = strlen (command);
|
||
|
||
if (0 < n && command[n - 1] == ' ')
|
||
command[n - 1] = '\0';
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Functions for the x86-64 ELF linker. */
|
||
|
||
/* The name of the dynamic interpreter. This is put in the .interp
|
||
section. */
|
||
|
||
#define ELF_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
|
||
|
||
/* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
|
||
copying dynamic variables from a shared lib into an app's dynbss
|
||
section, and instead use a dynamic relocation to point into the
|
||
shared lib. */
|
||
#define ELIMINATE_COPY_RELOCS 1
|
||
|
||
/* The size in bytes of an entry in the global offset table. */
|
||
|
||
#define GOT_ENTRY_SIZE 8
|
||
|
||
/* The size in bytes of an entry in the procedure linkage table. */
|
||
|
||
#define PLT_ENTRY_SIZE 16
|
||
|
||
/* The first entry in a procedure linkage table looks like this. See the
|
||
SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
|
||
|
||
static const bfd_byte elf64_x86_64_plt0_entry[PLT_ENTRY_SIZE] =
|
||
{
|
||
0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
|
||
0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
|
||
0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
|
||
};
|
||
|
||
/* Subsequent entries in a procedure linkage table look like this. */
|
||
|
||
static const bfd_byte elf64_x86_64_plt_entry[PLT_ENTRY_SIZE] =
|
||
{
|
||
0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
|
||
0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
|
||
0x68, /* pushq immediate */
|
||
0, 0, 0, 0, /* replaced with index into relocation table. */
|
||
0xe9, /* jmp relative */
|
||
0, 0, 0, 0 /* replaced with offset to start of .plt0. */
|
||
};
|
||
|
||
/* The x86-64 linker needs to keep track of the number of relocs that
|
||
it decides to copy as dynamic relocs in check_relocs for each symbol.
|
||
This is so that it can later discard them if they are found to be
|
||
unnecessary. We store the information in a field extending the
|
||
regular ELF linker hash table. */
|
||
|
||
struct elf64_x86_64_dyn_relocs
|
||
{
|
||
/* Next section. */
|
||
struct elf64_x86_64_dyn_relocs *next;
|
||
|
||
/* The input section of the reloc. */
|
||
asection *sec;
|
||
|
||
/* Total number of relocs copied for the input section. */
|
||
bfd_size_type count;
|
||
|
||
/* Number of pc-relative relocs copied for the input section. */
|
||
bfd_size_type pc_count;
|
||
};
|
||
|
||
/* x86-64 ELF linker hash entry. */
|
||
|
||
struct elf64_x86_64_link_hash_entry
|
||
{
|
||
struct elf_link_hash_entry elf;
|
||
|
||
/* Track dynamic relocs copied for this symbol. */
|
||
struct elf64_x86_64_dyn_relocs *dyn_relocs;
|
||
|
||
#define GOT_UNKNOWN 0
|
||
#define GOT_NORMAL 1
|
||
#define GOT_TLS_GD 2
|
||
#define GOT_TLS_IE 3
|
||
#define GOT_TLS_GDESC 4
|
||
#define GOT_TLS_GD_BOTH_P(type) \
|
||
((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
|
||
#define GOT_TLS_GD_P(type) \
|
||
((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
|
||
#define GOT_TLS_GDESC_P(type) \
|
||
((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
|
||
#define GOT_TLS_GD_ANY_P(type) \
|
||
(GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
|
||
unsigned char tls_type;
|
||
|
||
/* Offset of the GOTPLT entry reserved for the TLS descriptor,
|
||
starting at the end of the jump table. */
|
||
bfd_vma tlsdesc_got;
|
||
};
|
||
|
||
#define elf64_x86_64_hash_entry(ent) \
|
||
((struct elf64_x86_64_link_hash_entry *)(ent))
|
||
|
||
struct elf64_x86_64_obj_tdata
|
||
{
|
||
struct elf_obj_tdata root;
|
||
|
||
/* tls_type for each local got entry. */
|
||
char *local_got_tls_type;
|
||
|
||
/* GOTPLT entries for TLS descriptors. */
|
||
bfd_vma *local_tlsdesc_gotent;
|
||
};
|
||
|
||
#define elf64_x86_64_tdata(abfd) \
|
||
((struct elf64_x86_64_obj_tdata *) (abfd)->tdata.any)
|
||
|
||
#define elf64_x86_64_local_got_tls_type(abfd) \
|
||
(elf64_x86_64_tdata (abfd)->local_got_tls_type)
|
||
|
||
#define elf64_x86_64_local_tlsdesc_gotent(abfd) \
|
||
(elf64_x86_64_tdata (abfd)->local_tlsdesc_gotent)
|
||
|
||
/* x86-64 ELF linker hash table. */
|
||
|
||
struct elf64_x86_64_link_hash_table
|
||
{
|
||
struct elf_link_hash_table elf;
|
||
|
||
/* Short-cuts to get to dynamic linker sections. */
|
||
asection *sgot;
|
||
asection *sgotplt;
|
||
asection *srelgot;
|
||
asection *splt;
|
||
asection *srelplt;
|
||
asection *sdynbss;
|
||
asection *srelbss;
|
||
|
||
/* The offset into splt of the PLT entry for the TLS descriptor
|
||
resolver. Special values are 0, if not necessary (or not found
|
||
to be necessary yet), and -1 if needed but not determined
|
||
yet. */
|
||
bfd_vma tlsdesc_plt;
|
||
/* The offset into sgot of the GOT entry used by the PLT entry
|
||
above. */
|
||
bfd_vma tlsdesc_got;
|
||
|
||
union {
|
||
bfd_signed_vma refcount;
|
||
bfd_vma offset;
|
||
} tls_ld_got;
|
||
|
||
/* The amount of space used by the jump slots in the GOT. */
|
||
bfd_vma sgotplt_jump_table_size;
|
||
|
||
/* Small local sym to section mapping cache. */
|
||
struct sym_sec_cache sym_sec;
|
||
};
|
||
|
||
/* Get the x86-64 ELF linker hash table from a link_info structure. */
|
||
|
||
#define elf64_x86_64_hash_table(p) \
|
||
((struct elf64_x86_64_link_hash_table *) ((p)->hash))
|
||
|
||
#define elf64_x86_64_compute_jump_table_size(htab) \
|
||
((htab)->srelplt->reloc_count * GOT_ENTRY_SIZE)
|
||
|
||
/* Create an entry in an x86-64 ELF linker hash table. */
|
||
|
||
static struct bfd_hash_entry *
|
||
link_hash_newfunc (struct bfd_hash_entry *entry, struct bfd_hash_table *table,
|
||
const char *string)
|
||
{
|
||
/* Allocate the structure if it has not already been allocated by a
|
||
subclass. */
|
||
if (entry == NULL)
|
||
{
|
||
entry = bfd_hash_allocate (table,
|
||
sizeof (struct elf64_x86_64_link_hash_entry));
|
||
if (entry == NULL)
|
||
return entry;
|
||
}
|
||
|
||
/* Call the allocation method of the superclass. */
|
||
entry = _bfd_elf_link_hash_newfunc (entry, table, string);
|
||
if (entry != NULL)
|
||
{
|
||
struct elf64_x86_64_link_hash_entry *eh;
|
||
|
||
eh = (struct elf64_x86_64_link_hash_entry *) entry;
|
||
eh->dyn_relocs = NULL;
|
||
eh->tls_type = GOT_UNKNOWN;
|
||
eh->tlsdesc_got = (bfd_vma) -1;
|
||
}
|
||
|
||
return entry;
|
||
}
|
||
|
||
/* Create an X86-64 ELF linker hash table. */
|
||
|
||
static struct bfd_link_hash_table *
|
||
elf64_x86_64_link_hash_table_create (bfd *abfd)
|
||
{
|
||
struct elf64_x86_64_link_hash_table *ret;
|
||
bfd_size_type amt = sizeof (struct elf64_x86_64_link_hash_table);
|
||
|
||
ret = (struct elf64_x86_64_link_hash_table *) bfd_malloc (amt);
|
||
if (ret == NULL)
|
||
return NULL;
|
||
|
||
if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc,
|
||
sizeof (struct elf64_x86_64_link_hash_entry)))
|
||
{
|
||
free (ret);
|
||
return NULL;
|
||
}
|
||
|
||
ret->sgot = NULL;
|
||
ret->sgotplt = NULL;
|
||
ret->srelgot = NULL;
|
||
ret->splt = NULL;
|
||
ret->srelplt = NULL;
|
||
ret->sdynbss = NULL;
|
||
ret->srelbss = NULL;
|
||
ret->sym_sec.abfd = NULL;
|
||
ret->tlsdesc_plt = 0;
|
||
ret->tlsdesc_got = 0;
|
||
ret->tls_ld_got.refcount = 0;
|
||
ret->sgotplt_jump_table_size = 0;
|
||
|
||
return &ret->elf.root;
|
||
}
|
||
|
||
/* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
|
||
shortcuts to them in our hash table. */
|
||
|
||
static bfd_boolean
|
||
create_got_section (bfd *dynobj, struct bfd_link_info *info)
|
||
{
|
||
struct elf64_x86_64_link_hash_table *htab;
|
||
|
||
if (! _bfd_elf_create_got_section (dynobj, info))
|
||
return FALSE;
|
||
|
||
htab = elf64_x86_64_hash_table (info);
|
||
htab->sgot = bfd_get_section_by_name (dynobj, ".got");
|
||
htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
|
||
if (!htab->sgot || !htab->sgotplt)
|
||
abort ();
|
||
|
||
htab->srelgot = bfd_make_section_with_flags (dynobj, ".rela.got",
|
||
(SEC_ALLOC | SEC_LOAD
|
||
| SEC_HAS_CONTENTS
|
||
| SEC_IN_MEMORY
|
||
| SEC_LINKER_CREATED
|
||
| SEC_READONLY));
|
||
if (htab->srelgot == NULL
|
||
|| ! bfd_set_section_alignment (dynobj, htab->srelgot, 3))
|
||
return FALSE;
|
||
return TRUE;
|
||
}
|
||
|
||
/* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
|
||
.rela.bss sections in DYNOBJ, and set up shortcuts to them in our
|
||
hash table. */
|
||
|
||
static bfd_boolean
|
||
elf64_x86_64_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
|
||
{
|
||
struct elf64_x86_64_link_hash_table *htab;
|
||
|
||
htab = elf64_x86_64_hash_table (info);
|
||
if (!htab->sgot && !create_got_section (dynobj, info))
|
||
return FALSE;
|
||
|
||
if (!_bfd_elf_create_dynamic_sections (dynobj, info))
|
||
return FALSE;
|
||
|
||
htab->splt = bfd_get_section_by_name (dynobj, ".plt");
|
||
htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
|
||
htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
|
||
if (!info->shared)
|
||
htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
|
||
|
||
if (!htab->splt || !htab->srelplt || !htab->sdynbss
|
||
|| (!info->shared && !htab->srelbss))
|
||
abort ();
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Copy the extra info we tack onto an elf_link_hash_entry. */
|
||
|
||
static void
|
||
elf64_x86_64_copy_indirect_symbol (struct bfd_link_info *info,
|
||
struct elf_link_hash_entry *dir,
|
||
struct elf_link_hash_entry *ind)
|
||
{
|
||
struct elf64_x86_64_link_hash_entry *edir, *eind;
|
||
|
||
edir = (struct elf64_x86_64_link_hash_entry *) dir;
|
||
eind = (struct elf64_x86_64_link_hash_entry *) ind;
|
||
|
||
if (eind->dyn_relocs != NULL)
|
||
{
|
||
if (edir->dyn_relocs != NULL)
|
||
{
|
||
struct elf64_x86_64_dyn_relocs **pp;
|
||
struct elf64_x86_64_dyn_relocs *p;
|
||
|
||
/* Add reloc counts against the indirect sym to the direct sym
|
||
list. Merge any entries against the same section. */
|
||
for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
|
||
{
|
||
struct elf64_x86_64_dyn_relocs *q;
|
||
|
||
for (q = edir->dyn_relocs; q != NULL; q = q->next)
|
||
if (q->sec == p->sec)
|
||
{
|
||
q->pc_count += p->pc_count;
|
||
q->count += p->count;
|
||
*pp = p->next;
|
||
break;
|
||
}
|
||
if (q == NULL)
|
||
pp = &p->next;
|
||
}
|
||
*pp = edir->dyn_relocs;
|
||
}
|
||
|
||
edir->dyn_relocs = eind->dyn_relocs;
|
||
eind->dyn_relocs = NULL;
|
||
}
|
||
|
||
if (ind->root.type == bfd_link_hash_indirect
|
||
&& dir->got.refcount <= 0)
|
||
{
|
||
edir->tls_type = eind->tls_type;
|
||
eind->tls_type = GOT_UNKNOWN;
|
||
}
|
||
|
||
if (ELIMINATE_COPY_RELOCS
|
||
&& ind->root.type != bfd_link_hash_indirect
|
||
&& dir->dynamic_adjusted)
|
||
{
|
||
/* If called to transfer flags for a weakdef during processing
|
||
of elf_adjust_dynamic_symbol, don't copy non_got_ref.
|
||
We clear it ourselves for ELIMINATE_COPY_RELOCS. */
|
||
dir->ref_dynamic |= ind->ref_dynamic;
|
||
dir->ref_regular |= ind->ref_regular;
|
||
dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
|
||
dir->needs_plt |= ind->needs_plt;
|
||
dir->pointer_equality_needed |= ind->pointer_equality_needed;
|
||
}
|
||
else
|
||
_bfd_elf_link_hash_copy_indirect (info, dir, ind);
|
||
}
|
||
|
||
static bfd_boolean
|
||
elf64_x86_64_mkobject (bfd *abfd)
|
||
{
|
||
if (abfd->tdata.any == NULL)
|
||
{
|
||
bfd_size_type amt = sizeof (struct elf64_x86_64_obj_tdata);
|
||
abfd->tdata.any = bfd_zalloc (abfd, amt);
|
||
if (abfd->tdata.any == NULL)
|
||
return FALSE;
|
||
}
|
||
return bfd_elf_mkobject (abfd);
|
||
}
|
||
|
||
static bfd_boolean
|
||
elf64_x86_64_elf_object_p (bfd *abfd)
|
||
{
|
||
/* Set the right machine number for an x86-64 elf64 file. */
|
||
bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
|
||
return TRUE;
|
||
}
|
||
|
||
typedef union
|
||
{
|
||
unsigned char c[2];
|
||
uint16_t i;
|
||
}
|
||
x86_64_opcode16;
|
||
|
||
typedef union
|
||
{
|
||
unsigned char c[4];
|
||
uint32_t i;
|
||
}
|
||
x86_64_opcode32;
|
||
|
||
/* Return TRUE if the TLS access code sequence support transition
|
||
from R_TYPE. */
|
||
|
||
static bfd_boolean
|
||
elf64_x86_64_check_tls_transition (bfd *abfd, asection *sec,
|
||
bfd_byte *contents,
|
||
Elf_Internal_Shdr *symtab_hdr,
|
||
struct elf_link_hash_entry **sym_hashes,
|
||
unsigned int r_type,
|
||
const Elf_Internal_Rela *rel,
|
||
const Elf_Internal_Rela *relend)
|
||
{
|
||
unsigned int val;
|
||
unsigned long r_symndx;
|
||
struct elf_link_hash_entry *h;
|
||
bfd_vma offset;
|
||
|
||
/* Get the section contents. */
|
||
if (contents == NULL)
|
||
{
|
||
if (elf_section_data (sec)->this_hdr.contents != NULL)
|
||
contents = elf_section_data (sec)->this_hdr.contents;
|
||
else
|
||
{
|
||
/* FIXME: How to better handle error condition? */
|
||
if (!bfd_malloc_and_get_section (abfd, sec, &contents))
|
||
return FALSE;
|
||
|
||
/* Cache the section contents for elf_link_input_bfd. */
|
||
elf_section_data (sec)->this_hdr.contents = contents;
|
||
}
|
||
}
|
||
|
||
offset = rel->r_offset;
|
||
switch (r_type)
|
||
{
|
||
case R_X86_64_TLSGD:
|
||
case R_X86_64_TLSLD:
|
||
if ((rel + 1) >= relend)
|
||
return FALSE;
|
||
|
||
if (r_type == R_X86_64_TLSGD)
|
||
{
|
||
/* Check transition from GD access model. Only
|
||
.byte 0x66; leaq foo@tlsgd(%rip), %rdi
|
||
.word 0x6666; rex64; call __tls_get_addr
|
||
can transit to different access model. */
|
||
|
||
static x86_64_opcode32 leaq = { { 0x66, 0x48, 0x8d, 0x3d } },
|
||
call = { { 0x66, 0x66, 0x48, 0xe8 } };
|
||
if (offset < 4
|
||
|| (offset + 12) > sec->size
|
||
|| bfd_get_32 (abfd, contents + offset - 4) != leaq.i
|
||
|| bfd_get_32 (abfd, contents + offset + 4) != call.i)
|
||
return FALSE;
|
||
}
|
||
else
|
||
{
|
||
/* Check transition from LD access model. Only
|
||
leaq foo@tlsld(%rip), %rdi;
|
||
call __tls_get_addr
|
||
can transit to different access model. */
|
||
|
||
static x86_64_opcode32 ld = { { 0x48, 0x8d, 0x3d, 0xe8 } };
|
||
x86_64_opcode32 op;
|
||
|
||
if (offset < 3 || (offset + 9) > sec->size)
|
||
return FALSE;
|
||
|
||
op.i = bfd_get_32 (abfd, contents + offset - 3);
|
||
op.c[3] = bfd_get_8 (abfd, contents + offset + 4);
|
||
if (op.i != ld.i)
|
||
return FALSE;
|
||
}
|
||
|
||
r_symndx = ELF64_R_SYM (rel[1].r_info);
|
||
if (r_symndx < symtab_hdr->sh_info)
|
||
return FALSE;
|
||
|
||
h = sym_hashes[r_symndx - symtab_hdr->sh_info];
|
||
return (h != NULL
|
||
&& h->root.root.string != NULL
|
||
&& (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PC32
|
||
|| ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32)
|
||
&& (strcmp (h->root.root.string, "__tls_get_addr") == 0));
|
||
|
||
case R_X86_64_GOTTPOFF:
|
||
/* Check transition from IE access model:
|
||
movq foo@gottpoff(%rip), %reg
|
||
addq foo@gottpoff(%rip), %reg
|
||
*/
|
||
|
||
if (offset < 3 || (offset + 4) > sec->size)
|
||
return FALSE;
|
||
|
||
val = bfd_get_8 (abfd, contents + offset - 3);
|
||
if (val != 0x48 && val != 0x4c)
|
||
return FALSE;
|
||
|
||
val = bfd_get_8 (abfd, contents + offset - 2);
|
||
if (val != 0x8b && val != 0x03)
|
||
return FALSE;
|
||
|
||
val = bfd_get_8 (abfd, contents + offset - 1);
|
||
return (val & 0xc7) == 5;
|
||
|
||
case R_X86_64_GOTPC32_TLSDESC:
|
||
/* Check transition from GDesc access model:
|
||
leaq x@tlsdesc(%rip), %rax
|
||
|
||
Make sure it's a leaq adding rip to a 32-bit offset
|
||
into any register, although it's probably almost always
|
||
going to be rax. */
|
||
|
||
if (offset < 3 || (offset + 4) > sec->size)
|
||
return FALSE;
|
||
|
||
val = bfd_get_8 (abfd, contents + offset - 3);
|
||
if ((val & 0xfb) != 0x48)
|
||
return FALSE;
|
||
|
||
if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
|
||
return FALSE;
|
||
|
||
val = bfd_get_8 (abfd, contents + offset - 1);
|
||
return (val & 0xc7) == 0x05;
|
||
|
||
case R_X86_64_TLSDESC_CALL:
|
||
/* Check transition from GDesc access model:
|
||
call *x@tlsdesc(%rax)
|
||
*/
|
||
if (offset + 2 <= sec->size)
|
||
{
|
||
/* Make sure that it's a call *x@tlsdesc(%rax). */
|
||
static x86_64_opcode16 call = { { 0xff, 0x10 } };
|
||
return bfd_get_16 (abfd, contents + offset) == call.i;
|
||
}
|
||
|
||
return FALSE;
|
||
|
||
default:
|
||
abort ();
|
||
}
|
||
}
|
||
|
||
/* Return TRUE if the TLS access transition is OK or no transition
|
||
will be performed. Update R_TYPE if there is a transition. */
|
||
|
||
static bfd_boolean
|
||
elf64_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd,
|
||
asection *sec, bfd_byte *contents,
|
||
Elf_Internal_Shdr *symtab_hdr,
|
||
struct elf_link_hash_entry **sym_hashes,
|
||
unsigned int *r_type, int tls_type,
|
||
const Elf_Internal_Rela *rel,
|
||
const Elf_Internal_Rela *relend,
|
||
struct elf_link_hash_entry *h)
|
||
{
|
||
unsigned int from_type = *r_type;
|
||
unsigned int to_type = from_type;
|
||
bfd_boolean check = TRUE;
|
||
|
||
switch (from_type)
|
||
{
|
||
case R_X86_64_TLSGD:
|
||
case R_X86_64_GOTPC32_TLSDESC:
|
||
case R_X86_64_TLSDESC_CALL:
|
||
case R_X86_64_GOTTPOFF:
|
||
if (!info->shared)
|
||
{
|
||
if (h == NULL)
|
||
to_type = R_X86_64_TPOFF32;
|
||
else
|
||
to_type = R_X86_64_GOTTPOFF;
|
||
}
|
||
|
||
/* When we are called from elf64_x86_64_relocate_section,
|
||
CONTENTS isn't NULL and there may be additional transitions
|
||
based on TLS_TYPE. */
|
||
if (contents != NULL)
|
||
{
|
||
unsigned int new_to_type = to_type;
|
||
|
||
if (!info->shared
|
||
&& h != NULL
|
||
&& h->dynindx == -1
|
||
&& tls_type == GOT_TLS_IE)
|
||
new_to_type = R_X86_64_TPOFF32;
|
||
|
||
if (to_type == R_X86_64_TLSGD
|
||
|| to_type == R_X86_64_GOTPC32_TLSDESC
|
||
|| to_type == R_X86_64_TLSDESC_CALL)
|
||
{
|
||
if (tls_type == GOT_TLS_IE)
|
||
new_to_type = R_X86_64_GOTTPOFF;
|
||
}
|
||
|
||
/* We checked the transition before when we were called from
|
||
elf64_x86_64_check_relocs. We only want to check the new
|
||
transition which hasn't been checked before. */
|
||
check = new_to_type != to_type && from_type == to_type;
|
||
to_type = new_to_type;
|
||
}
|
||
|
||
break;
|
||
|
||
case R_X86_64_TLSLD:
|
||
if (!info->shared)
|
||
to_type = R_X86_64_TPOFF32;
|
||
break;
|
||
|
||
default:
|
||
return TRUE;
|
||
}
|
||
|
||
/* Return TRUE if there is no transition. */
|
||
if (from_type == to_type)
|
||
return TRUE;
|
||
|
||
/* Check if the transition can be performed. */
|
||
if (check
|
||
&& ! elf64_x86_64_check_tls_transition (abfd, sec, contents,
|
||
symtab_hdr, sym_hashes,
|
||
from_type, rel, relend))
|
||
{
|
||
reloc_howto_type *from, *to;
|
||
|
||
from = elf64_x86_64_rtype_to_howto (abfd, from_type);
|
||
to = elf64_x86_64_rtype_to_howto (abfd, to_type);
|
||
|
||
(*_bfd_error_handler)
|
||
(_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
|
||
"in section `%A' failed"),
|
||
abfd, sec, from->name, to->name,
|
||
h ? h->root.root.string : "a local symbol",
|
||
(unsigned long) rel->r_offset);
|
||
bfd_set_error (bfd_error_bad_value);
|
||
return FALSE;
|
||
}
|
||
|
||
*r_type = to_type;
|
||
return TRUE;
|
||
}
|
||
|
||
/* Look through the relocs for a section during the first phase, and
|
||
calculate needed space in the global offset table, procedure
|
||
linkage table, and dynamic reloc sections. */
|
||
|
||
static bfd_boolean
|
||
elf64_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
|
||
asection *sec,
|
||
const Elf_Internal_Rela *relocs)
|
||
{
|
||
struct elf64_x86_64_link_hash_table *htab;
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
struct elf_link_hash_entry **sym_hashes;
|
||
const Elf_Internal_Rela *rel;
|
||
const Elf_Internal_Rela *rel_end;
|
||
asection *sreloc;
|
||
|
||
if (info->relocatable)
|
||
return TRUE;
|
||
|
||
htab = elf64_x86_64_hash_table (info);
|
||
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
|
||
sym_hashes = elf_sym_hashes (abfd);
|
||
|
||
sreloc = NULL;
|
||
|
||
rel_end = relocs + sec->reloc_count;
|
||
for (rel = relocs; rel < rel_end; rel++)
|
||
{
|
||
unsigned int r_type;
|
||
unsigned long r_symndx;
|
||
struct elf_link_hash_entry *h;
|
||
|
||
r_symndx = ELF64_R_SYM (rel->r_info);
|
||
r_type = ELF64_R_TYPE (rel->r_info);
|
||
|
||
if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
|
||
{
|
||
(*_bfd_error_handler) (_("%B: bad symbol index: %d"),
|
||
abfd, r_symndx);
|
||
return FALSE;
|
||
}
|
||
|
||
if (r_symndx < symtab_hdr->sh_info)
|
||
h = NULL;
|
||
else
|
||
{
|
||
h = sym_hashes[r_symndx - symtab_hdr->sh_info];
|
||
while (h->root.type == bfd_link_hash_indirect
|
||
|| h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
}
|
||
|
||
if (! elf64_x86_64_tls_transition (info, abfd, sec, NULL,
|
||
symtab_hdr, sym_hashes,
|
||
&r_type, GOT_UNKNOWN,
|
||
rel, rel_end, h))
|
||
return FALSE;
|
||
|
||
switch (r_type)
|
||
{
|
||
case R_X86_64_TLSLD:
|
||
htab->tls_ld_got.refcount += 1;
|
||
goto create_got;
|
||
|
||
case R_X86_64_TPOFF32:
|
||
if (info->shared)
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
|
||
abfd,
|
||
x86_64_elf_howto_table[r_type].name,
|
||
(h) ? h->root.root.string : "a local symbol");
|
||
bfd_set_error (bfd_error_bad_value);
|
||
return FALSE;
|
||
}
|
||
break;
|
||
|
||
case R_X86_64_GOTTPOFF:
|
||
if (info->shared)
|
||
info->flags |= DF_STATIC_TLS;
|
||
/* Fall through */
|
||
|
||
case R_X86_64_GOT32:
|
||
case R_X86_64_GOTPCREL:
|
||
case R_X86_64_TLSGD:
|
||
case R_X86_64_GOT64:
|
||
case R_X86_64_GOTPCREL64:
|
||
case R_X86_64_GOTPLT64:
|
||
case R_X86_64_GOTPC32_TLSDESC:
|
||
case R_X86_64_TLSDESC_CALL:
|
||
/* This symbol requires a global offset table entry. */
|
||
{
|
||
int tls_type, old_tls_type;
|
||
|
||
switch (r_type)
|
||
{
|
||
default: tls_type = GOT_NORMAL; break;
|
||
case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break;
|
||
case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break;
|
||
case R_X86_64_GOTPC32_TLSDESC:
|
||
case R_X86_64_TLSDESC_CALL:
|
||
tls_type = GOT_TLS_GDESC; break;
|
||
}
|
||
|
||
if (h != NULL)
|
||
{
|
||
if (r_type == R_X86_64_GOTPLT64)
|
||
{
|
||
/* This relocation indicates that we also need
|
||
a PLT entry, as this is a function. We don't need
|
||
a PLT entry for local symbols. */
|
||
h->needs_plt = 1;
|
||
h->plt.refcount += 1;
|
||
}
|
||
h->got.refcount += 1;
|
||
old_tls_type = elf64_x86_64_hash_entry (h)->tls_type;
|
||
}
|
||
else
|
||
{
|
||
bfd_signed_vma *local_got_refcounts;
|
||
|
||
/* This is a global offset table entry for a local symbol. */
|
||
local_got_refcounts = elf_local_got_refcounts (abfd);
|
||
if (local_got_refcounts == NULL)
|
||
{
|
||
bfd_size_type size;
|
||
|
||
size = symtab_hdr->sh_info;
|
||
size *= sizeof (bfd_signed_vma)
|
||
+ sizeof (bfd_vma) + sizeof (char);
|
||
local_got_refcounts = ((bfd_signed_vma *)
|
||
bfd_zalloc (abfd, size));
|
||
if (local_got_refcounts == NULL)
|
||
return FALSE;
|
||
elf_local_got_refcounts (abfd) = local_got_refcounts;
|
||
elf64_x86_64_local_tlsdesc_gotent (abfd)
|
||
= (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
|
||
elf64_x86_64_local_got_tls_type (abfd)
|
||
= (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
|
||
}
|
||
local_got_refcounts[r_symndx] += 1;
|
||
old_tls_type
|
||
= elf64_x86_64_local_got_tls_type (abfd) [r_symndx];
|
||
}
|
||
|
||
/* If a TLS symbol is accessed using IE at least once,
|
||
there is no point to use dynamic model for it. */
|
||
if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
|
||
&& (! GOT_TLS_GD_ANY_P (old_tls_type)
|
||
|| tls_type != GOT_TLS_IE))
|
||
{
|
||
if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type))
|
||
tls_type = old_tls_type;
|
||
else if (GOT_TLS_GD_ANY_P (old_tls_type)
|
||
&& GOT_TLS_GD_ANY_P (tls_type))
|
||
tls_type |= old_tls_type;
|
||
else
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%B: '%s' accessed both as normal and thread local symbol"),
|
||
abfd, h ? h->root.root.string : "<local>");
|
||
return FALSE;
|
||
}
|
||
}
|
||
|
||
if (old_tls_type != tls_type)
|
||
{
|
||
if (h != NULL)
|
||
elf64_x86_64_hash_entry (h)->tls_type = tls_type;
|
||
else
|
||
elf64_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type;
|
||
}
|
||
}
|
||
/* Fall through */
|
||
|
||
case R_X86_64_GOTOFF64:
|
||
case R_X86_64_GOTPC32:
|
||
case R_X86_64_GOTPC64:
|
||
create_got:
|
||
if (htab->sgot == NULL)
|
||
{
|
||
if (htab->elf.dynobj == NULL)
|
||
htab->elf.dynobj = abfd;
|
||
if (!create_got_section (htab->elf.dynobj, info))
|
||
return FALSE;
|
||
}
|
||
break;
|
||
|
||
case R_X86_64_PLT32:
|
||
/* This symbol requires a procedure linkage table entry. We
|
||
actually build the entry in adjust_dynamic_symbol,
|
||
because this might be a case of linking PIC code which is
|
||
never referenced by a dynamic object, in which case we
|
||
don't need to generate a procedure linkage table entry
|
||
after all. */
|
||
|
||
/* If this is a local symbol, we resolve it directly without
|
||
creating a procedure linkage table entry. */
|
||
if (h == NULL)
|
||
continue;
|
||
|
||
h->needs_plt = 1;
|
||
h->plt.refcount += 1;
|
||
break;
|
||
|
||
case R_X86_64_PLTOFF64:
|
||
/* This tries to form the 'address' of a function relative
|
||
to GOT. For global symbols we need a PLT entry. */
|
||
if (h != NULL)
|
||
{
|
||
h->needs_plt = 1;
|
||
h->plt.refcount += 1;
|
||
}
|
||
goto create_got;
|
||
|
||
case R_X86_64_8:
|
||
case R_X86_64_16:
|
||
case R_X86_64_32:
|
||
case R_X86_64_32S:
|
||
/* Let's help debug shared library creation. These relocs
|
||
cannot be used in shared libs. Don't error out for
|
||
sections we don't care about, such as debug sections or
|
||
non-constant sections. */
|
||
if (info->shared
|
||
&& (sec->flags & SEC_ALLOC) != 0
|
||
&& (sec->flags & SEC_READONLY) != 0)
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
|
||
abfd,
|
||
x86_64_elf_howto_table[r_type].name,
|
||
(h) ? h->root.root.string : "a local symbol");
|
||
bfd_set_error (bfd_error_bad_value);
|
||
return FALSE;
|
||
}
|
||
/* Fall through. */
|
||
|
||
case R_X86_64_PC8:
|
||
case R_X86_64_PC16:
|
||
case R_X86_64_PC32:
|
||
case R_X86_64_PC64:
|
||
case R_X86_64_64:
|
||
if (h != NULL && !info->shared)
|
||
{
|
||
/* If this reloc is in a read-only section, we might
|
||
need a copy reloc. We can't check reliably at this
|
||
stage whether the section is read-only, as input
|
||
sections have not yet been mapped to output sections.
|
||
Tentatively set the flag for now, and correct in
|
||
adjust_dynamic_symbol. */
|
||
h->non_got_ref = 1;
|
||
|
||
/* We may need a .plt entry if the function this reloc
|
||
refers to is in a shared lib. */
|
||
h->plt.refcount += 1;
|
||
if (r_type != R_X86_64_PC32 && r_type != R_X86_64_PC64)
|
||
h->pointer_equality_needed = 1;
|
||
}
|
||
|
||
/* If we are creating a shared library, and this is a reloc
|
||
against a global symbol, or a non PC relative reloc
|
||
against a local symbol, then we need to copy the reloc
|
||
into the shared library. However, if we are linking with
|
||
-Bsymbolic, we do not need to copy a reloc against a
|
||
global symbol which is defined in an object we are
|
||
including in the link (i.e., DEF_REGULAR is set). At
|
||
this point we have not seen all the input files, so it is
|
||
possible that DEF_REGULAR is not set now but will be set
|
||
later (it is never cleared). In case of a weak definition,
|
||
DEF_REGULAR may be cleared later by a strong definition in
|
||
a shared library. We account for that possibility below by
|
||
storing information in the relocs_copied field of the hash
|
||
table entry. A similar situation occurs when creating
|
||
shared libraries and symbol visibility changes render the
|
||
symbol local.
|
||
|
||
If on the other hand, we are creating an executable, we
|
||
may need to keep relocations for symbols satisfied by a
|
||
dynamic library if we manage to avoid copy relocs for the
|
||
symbol. */
|
||
if ((info->shared
|
||
&& (sec->flags & SEC_ALLOC) != 0
|
||
&& (((r_type != R_X86_64_PC8)
|
||
&& (r_type != R_X86_64_PC16)
|
||
&& (r_type != R_X86_64_PC32)
|
||
&& (r_type != R_X86_64_PC64))
|
||
|| (h != NULL
|
||
&& (! SYMBOLIC_BIND (info, h)
|
||
|| h->root.type == bfd_link_hash_defweak
|
||
|| !h->def_regular))))
|
||
|| (ELIMINATE_COPY_RELOCS
|
||
&& !info->shared
|
||
&& (sec->flags & SEC_ALLOC) != 0
|
||
&& h != NULL
|
||
&& (h->root.type == bfd_link_hash_defweak
|
||
|| !h->def_regular)))
|
||
{
|
||
struct elf64_x86_64_dyn_relocs *p;
|
||
struct elf64_x86_64_dyn_relocs **head;
|
||
|
||
/* We must copy these reloc types into the output file.
|
||
Create a reloc section in dynobj and make room for
|
||
this reloc. */
|
||
if (sreloc == NULL)
|
||
{
|
||
const char *name;
|
||
bfd *dynobj;
|
||
|
||
name = (bfd_elf_string_from_elf_section
|
||
(abfd,
|
||
elf_elfheader (abfd)->e_shstrndx,
|
||
elf_section_data (sec)->rel_hdr.sh_name));
|
||
if (name == NULL)
|
||
return FALSE;
|
||
|
||
if (! CONST_STRNEQ (name, ".rela")
|
||
|| strcmp (bfd_get_section_name (abfd, sec),
|
||
name + 5) != 0)
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%B: bad relocation section name `%s\'"),
|
||
abfd, name);
|
||
}
|
||
|
||
if (htab->elf.dynobj == NULL)
|
||
htab->elf.dynobj = abfd;
|
||
|
||
dynobj = htab->elf.dynobj;
|
||
|
||
sreloc = bfd_get_section_by_name (dynobj, name);
|
||
if (sreloc == NULL)
|
||
{
|
||
flagword flags;
|
||
|
||
flags = (SEC_HAS_CONTENTS | SEC_READONLY
|
||
| SEC_IN_MEMORY | SEC_LINKER_CREATED);
|
||
if ((sec->flags & SEC_ALLOC) != 0)
|
||
flags |= SEC_ALLOC | SEC_LOAD;
|
||
sreloc = bfd_make_section_with_flags (dynobj,
|
||
name,
|
||
flags);
|
||
if (sreloc == NULL
|
||
|| ! bfd_set_section_alignment (dynobj, sreloc, 3))
|
||
return FALSE;
|
||
}
|
||
elf_section_data (sec)->sreloc = sreloc;
|
||
}
|
||
|
||
/* If this is a global symbol, we count the number of
|
||
relocations we need for this symbol. */
|
||
if (h != NULL)
|
||
{
|
||
head = &((struct elf64_x86_64_link_hash_entry *) h)->dyn_relocs;
|
||
}
|
||
else
|
||
{
|
||
void **vpp;
|
||
/* Track dynamic relocs needed for local syms too.
|
||
We really need local syms available to do this
|
||
easily. Oh well. */
|
||
|
||
asection *s;
|
||
s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
|
||
sec, r_symndx);
|
||
if (s == NULL)
|
||
return FALSE;
|
||
|
||
/* Beware of type punned pointers vs strict aliasing
|
||
rules. */
|
||
vpp = &(elf_section_data (s)->local_dynrel);
|
||
head = (struct elf64_x86_64_dyn_relocs **)vpp;
|
||
}
|
||
|
||
p = *head;
|
||
if (p == NULL || p->sec != sec)
|
||
{
|
||
bfd_size_type amt = sizeof *p;
|
||
p = ((struct elf64_x86_64_dyn_relocs *)
|
||
bfd_alloc (htab->elf.dynobj, amt));
|
||
if (p == NULL)
|
||
return FALSE;
|
||
p->next = *head;
|
||
*head = p;
|
||
p->sec = sec;
|
||
p->count = 0;
|
||
p->pc_count = 0;
|
||
}
|
||
|
||
p->count += 1;
|
||
if (r_type == R_X86_64_PC8
|
||
|| r_type == R_X86_64_PC16
|
||
|| r_type == R_X86_64_PC32
|
||
|| r_type == R_X86_64_PC64)
|
||
p->pc_count += 1;
|
||
}
|
||
break;
|
||
|
||
/* This relocation describes the C++ object vtable hierarchy.
|
||
Reconstruct it for later use during GC. */
|
||
case R_X86_64_GNU_VTINHERIT:
|
||
if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
|
||
return FALSE;
|
||
break;
|
||
|
||
/* This relocation describes which C++ vtable entries are actually
|
||
used. Record for later use during GC. */
|
||
case R_X86_64_GNU_VTENTRY:
|
||
BFD_ASSERT (h != NULL);
|
||
if (h != NULL
|
||
&& !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
|
||
return FALSE;
|
||
break;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Return the section that should be marked against GC for a given
|
||
relocation. */
|
||
|
||
static asection *
|
||
elf64_x86_64_gc_mark_hook (asection *sec,
|
||
struct bfd_link_info *info,
|
||
Elf_Internal_Rela *rel,
|
||
struct elf_link_hash_entry *h,
|
||
Elf_Internal_Sym *sym)
|
||
{
|
||
if (h != NULL)
|
||
switch (ELF64_R_TYPE (rel->r_info))
|
||
{
|
||
case R_X86_64_GNU_VTINHERIT:
|
||
case R_X86_64_GNU_VTENTRY:
|
||
return NULL;
|
||
}
|
||
|
||
return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
|
||
}
|
||
|
||
/* Update the got entry reference counts for the section being removed. */
|
||
|
||
static bfd_boolean
|
||
elf64_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info,
|
||
asection *sec,
|
||
const Elf_Internal_Rela *relocs)
|
||
{
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
struct elf_link_hash_entry **sym_hashes;
|
||
bfd_signed_vma *local_got_refcounts;
|
||
const Elf_Internal_Rela *rel, *relend;
|
||
|
||
elf_section_data (sec)->local_dynrel = NULL;
|
||
|
||
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
|
||
sym_hashes = elf_sym_hashes (abfd);
|
||
local_got_refcounts = elf_local_got_refcounts (abfd);
|
||
|
||
relend = relocs + sec->reloc_count;
|
||
for (rel = relocs; rel < relend; rel++)
|
||
{
|
||
unsigned long r_symndx;
|
||
unsigned int r_type;
|
||
struct elf_link_hash_entry *h = NULL;
|
||
|
||
r_symndx = ELF64_R_SYM (rel->r_info);
|
||
if (r_symndx >= symtab_hdr->sh_info)
|
||
{
|
||
struct elf64_x86_64_link_hash_entry *eh;
|
||
struct elf64_x86_64_dyn_relocs **pp;
|
||
struct elf64_x86_64_dyn_relocs *p;
|
||
|
||
h = sym_hashes[r_symndx - symtab_hdr->sh_info];
|
||
while (h->root.type == bfd_link_hash_indirect
|
||
|| h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
eh = (struct elf64_x86_64_link_hash_entry *) h;
|
||
|
||
for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
|
||
if (p->sec == sec)
|
||
{
|
||
/* Everything must go for SEC. */
|
||
*pp = p->next;
|
||
break;
|
||
}
|
||
}
|
||
|
||
r_type = ELF64_R_TYPE (rel->r_info);
|
||
if (! elf64_x86_64_tls_transition (info, abfd, sec, NULL,
|
||
symtab_hdr, sym_hashes,
|
||
&r_type, GOT_UNKNOWN,
|
||
rel, relend, h))
|
||
return FALSE;
|
||
|
||
switch (r_type)
|
||
{
|
||
case R_X86_64_TLSLD:
|
||
if (elf64_x86_64_hash_table (info)->tls_ld_got.refcount > 0)
|
||
elf64_x86_64_hash_table (info)->tls_ld_got.refcount -= 1;
|
||
break;
|
||
|
||
case R_X86_64_TLSGD:
|
||
case R_X86_64_GOTPC32_TLSDESC:
|
||
case R_X86_64_TLSDESC_CALL:
|
||
case R_X86_64_GOTTPOFF:
|
||
case R_X86_64_GOT32:
|
||
case R_X86_64_GOTPCREL:
|
||
case R_X86_64_GOT64:
|
||
case R_X86_64_GOTPCREL64:
|
||
case R_X86_64_GOTPLT64:
|
||
if (h != NULL)
|
||
{
|
||
if (r_type == R_X86_64_GOTPLT64 && h->plt.refcount > 0)
|
||
h->plt.refcount -= 1;
|
||
if (h->got.refcount > 0)
|
||
h->got.refcount -= 1;
|
||
}
|
||
else if (local_got_refcounts != NULL)
|
||
{
|
||
if (local_got_refcounts[r_symndx] > 0)
|
||
local_got_refcounts[r_symndx] -= 1;
|
||
}
|
||
break;
|
||
|
||
case R_X86_64_8:
|
||
case R_X86_64_16:
|
||
case R_X86_64_32:
|
||
case R_X86_64_64:
|
||
case R_X86_64_32S:
|
||
case R_X86_64_PC8:
|
||
case R_X86_64_PC16:
|
||
case R_X86_64_PC32:
|
||
case R_X86_64_PC64:
|
||
if (info->shared)
|
||
break;
|
||
/* Fall thru */
|
||
|
||
case R_X86_64_PLT32:
|
||
case R_X86_64_PLTOFF64:
|
||
if (h != NULL)
|
||
{
|
||
if (h->plt.refcount > 0)
|
||
h->plt.refcount -= 1;
|
||
}
|
||
break;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Adjust a symbol defined by a dynamic object and referenced by a
|
||
regular object. The current definition is in some section of the
|
||
dynamic object, but we're not including those sections. We have to
|
||
change the definition to something the rest of the link can
|
||
understand. */
|
||
|
||
static bfd_boolean
|
||
elf64_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info,
|
||
struct elf_link_hash_entry *h)
|
||
{
|
||
struct elf64_x86_64_link_hash_table *htab;
|
||
asection *s;
|
||
|
||
/* If this is a function, put it in the procedure linkage table. We
|
||
will fill in the contents of the procedure linkage table later,
|
||
when we know the address of the .got section. */
|
||
if (h->type == STT_FUNC
|
||
|| h->needs_plt)
|
||
{
|
||
if (h->plt.refcount <= 0
|
||
|| SYMBOL_CALLS_LOCAL (info, h)
|
||
|| (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
|
||
&& h->root.type == bfd_link_hash_undefweak))
|
||
{
|
||
/* This case can occur if we saw a PLT32 reloc in an input
|
||
file, but the symbol was never referred to by a dynamic
|
||
object, or if all references were garbage collected. In
|
||
such a case, we don't actually need to build a procedure
|
||
linkage table, and we can just do a PC32 reloc instead. */
|
||
h->plt.offset = (bfd_vma) -1;
|
||
h->needs_plt = 0;
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
else
|
||
/* It's possible that we incorrectly decided a .plt reloc was
|
||
needed for an R_X86_64_PC32 reloc to a non-function sym in
|
||
check_relocs. We can't decide accurately between function and
|
||
non-function syms in check-relocs; Objects loaded later in
|
||
the link may change h->type. So fix it now. */
|
||
h->plt.offset = (bfd_vma) -1;
|
||
|
||
/* If this is a weak symbol, and there is a real definition, the
|
||
processor independent code will have arranged for us to see the
|
||
real definition first, and we can just use the same value. */
|
||
if (h->u.weakdef != NULL)
|
||
{
|
||
BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
|
||
|| h->u.weakdef->root.type == bfd_link_hash_defweak);
|
||
h->root.u.def.section = h->u.weakdef->root.u.def.section;
|
||
h->root.u.def.value = h->u.weakdef->root.u.def.value;
|
||
if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
|
||
h->non_got_ref = h->u.weakdef->non_got_ref;
|
||
return TRUE;
|
||
}
|
||
|
||
/* This is a reference to a symbol defined by a dynamic object which
|
||
is not a function. */
|
||
|
||
/* If we are creating a shared library, we must presume that the
|
||
only references to the symbol are via the global offset table.
|
||
For such cases we need not do anything here; the relocations will
|
||
be handled correctly by relocate_section. */
|
||
if (info->shared)
|
||
return TRUE;
|
||
|
||
/* If there are no references to this symbol that do not use the
|
||
GOT, we don't need to generate a copy reloc. */
|
||
if (!h->non_got_ref)
|
||
return TRUE;
|
||
|
||
/* If -z nocopyreloc was given, we won't generate them either. */
|
||
if (info->nocopyreloc)
|
||
{
|
||
h->non_got_ref = 0;
|
||
return TRUE;
|
||
}
|
||
|
||
if (ELIMINATE_COPY_RELOCS)
|
||
{
|
||
struct elf64_x86_64_link_hash_entry * eh;
|
||
struct elf64_x86_64_dyn_relocs *p;
|
||
|
||
eh = (struct elf64_x86_64_link_hash_entry *) h;
|
||
for (p = eh->dyn_relocs; p != NULL; p = p->next)
|
||
{
|
||
s = p->sec->output_section;
|
||
if (s != NULL && (s->flags & SEC_READONLY) != 0)
|
||
break;
|
||
}
|
||
|
||
/* If we didn't find any dynamic relocs in read-only sections, then
|
||
we'll be keeping the dynamic relocs and avoiding the copy reloc. */
|
||
if (p == NULL)
|
||
{
|
||
h->non_got_ref = 0;
|
||
return TRUE;
|
||
}
|
||
}
|
||
|
||
if (h->size == 0)
|
||
{
|
||
(*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
|
||
h->root.root.string);
|
||
return TRUE;
|
||
}
|
||
|
||
/* We must allocate the symbol in our .dynbss section, which will
|
||
become part of the .bss section of the executable. There will be
|
||
an entry for this symbol in the .dynsym section. The dynamic
|
||
object will contain position independent code, so all references
|
||
from the dynamic object to this symbol will go through the global
|
||
offset table. The dynamic linker will use the .dynsym entry to
|
||
determine the address it must put in the global offset table, so
|
||
both the dynamic object and the regular object will refer to the
|
||
same memory location for the variable. */
|
||
|
||
htab = elf64_x86_64_hash_table (info);
|
||
|
||
/* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
|
||
to copy the initial value out of the dynamic object and into the
|
||
runtime process image. */
|
||
if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
|
||
{
|
||
htab->srelbss->size += sizeof (Elf64_External_Rela);
|
||
h->needs_copy = 1;
|
||
}
|
||
|
||
s = htab->sdynbss;
|
||
|
||
return _bfd_elf_adjust_dynamic_copy (h, s);
|
||
}
|
||
|
||
/* Allocate space in .plt, .got and associated reloc sections for
|
||
dynamic relocs. */
|
||
|
||
static bfd_boolean
|
||
allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
|
||
{
|
||
struct bfd_link_info *info;
|
||
struct elf64_x86_64_link_hash_table *htab;
|
||
struct elf64_x86_64_link_hash_entry *eh;
|
||
struct elf64_x86_64_dyn_relocs *p;
|
||
|
||
if (h->root.type == bfd_link_hash_indirect)
|
||
return TRUE;
|
||
|
||
if (h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
|
||
info = (struct bfd_link_info *) inf;
|
||
htab = elf64_x86_64_hash_table (info);
|
||
|
||
if (htab->elf.dynamic_sections_created
|
||
&& h->plt.refcount > 0)
|
||
{
|
||
/* Make sure this symbol is output as a dynamic symbol.
|
||
Undefined weak syms won't yet be marked as dynamic. */
|
||
if (h->dynindx == -1
|
||
&& !h->forced_local)
|
||
{
|
||
if (! bfd_elf_link_record_dynamic_symbol (info, h))
|
||
return FALSE;
|
||
}
|
||
|
||
if (info->shared
|
||
|| WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
|
||
{
|
||
asection *s = htab->splt;
|
||
|
||
/* If this is the first .plt entry, make room for the special
|
||
first entry. */
|
||
if (s->size == 0)
|
||
s->size += PLT_ENTRY_SIZE;
|
||
|
||
h->plt.offset = s->size;
|
||
|
||
/* If this symbol is not defined in a regular file, and we are
|
||
not generating a shared library, then set the symbol to this
|
||
location in the .plt. This is required to make function
|
||
pointers compare as equal between the normal executable and
|
||
the shared library. */
|
||
if (! info->shared
|
||
&& !h->def_regular)
|
||
{
|
||
h->root.u.def.section = s;
|
||
h->root.u.def.value = h->plt.offset;
|
||
}
|
||
|
||
/* Make room for this entry. */
|
||
s->size += PLT_ENTRY_SIZE;
|
||
|
||
/* We also need to make an entry in the .got.plt section, which
|
||
will be placed in the .got section by the linker script. */
|
||
htab->sgotplt->size += GOT_ENTRY_SIZE;
|
||
|
||
/* We also need to make an entry in the .rela.plt section. */
|
||
htab->srelplt->size += sizeof (Elf64_External_Rela);
|
||
htab->srelplt->reloc_count++;
|
||
}
|
||
else
|
||
{
|
||
h->plt.offset = (bfd_vma) -1;
|
||
h->needs_plt = 0;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
h->plt.offset = (bfd_vma) -1;
|
||
h->needs_plt = 0;
|
||
}
|
||
|
||
eh = (struct elf64_x86_64_link_hash_entry *) h;
|
||
eh->tlsdesc_got = (bfd_vma) -1;
|
||
|
||
/* If R_X86_64_GOTTPOFF symbol is now local to the binary,
|
||
make it a R_X86_64_TPOFF32 requiring no GOT entry. */
|
||
if (h->got.refcount > 0
|
||
&& !info->shared
|
||
&& h->dynindx == -1
|
||
&& elf64_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE)
|
||
h->got.offset = (bfd_vma) -1;
|
||
else if (h->got.refcount > 0)
|
||
{
|
||
asection *s;
|
||
bfd_boolean dyn;
|
||
int tls_type = elf64_x86_64_hash_entry (h)->tls_type;
|
||
|
||
/* Make sure this symbol is output as a dynamic symbol.
|
||
Undefined weak syms won't yet be marked as dynamic. */
|
||
if (h->dynindx == -1
|
||
&& !h->forced_local)
|
||
{
|
||
if (! bfd_elf_link_record_dynamic_symbol (info, h))
|
||
return FALSE;
|
||
}
|
||
|
||
if (GOT_TLS_GDESC_P (tls_type))
|
||
{
|
||
eh->tlsdesc_got = htab->sgotplt->size
|
||
- elf64_x86_64_compute_jump_table_size (htab);
|
||
htab->sgotplt->size += 2 * GOT_ENTRY_SIZE;
|
||
h->got.offset = (bfd_vma) -2;
|
||
}
|
||
if (! GOT_TLS_GDESC_P (tls_type)
|
||
|| GOT_TLS_GD_P (tls_type))
|
||
{
|
||
s = htab->sgot;
|
||
h->got.offset = s->size;
|
||
s->size += GOT_ENTRY_SIZE;
|
||
if (GOT_TLS_GD_P (tls_type))
|
||
s->size += GOT_ENTRY_SIZE;
|
||
}
|
||
dyn = htab->elf.dynamic_sections_created;
|
||
/* R_X86_64_TLSGD needs one dynamic relocation if local symbol
|
||
and two if global.
|
||
R_X86_64_GOTTPOFF needs one dynamic relocation. */
|
||
if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
|
||
|| tls_type == GOT_TLS_IE)
|
||
htab->srelgot->size += sizeof (Elf64_External_Rela);
|
||
else if (GOT_TLS_GD_P (tls_type))
|
||
htab->srelgot->size += 2 * sizeof (Elf64_External_Rela);
|
||
else if (! GOT_TLS_GDESC_P (tls_type)
|
||
&& (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
|
||
|| h->root.type != bfd_link_hash_undefweak)
|
||
&& (info->shared
|
||
|| WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
|
||
htab->srelgot->size += sizeof (Elf64_External_Rela);
|
||
if (GOT_TLS_GDESC_P (tls_type))
|
||
{
|
||
htab->srelplt->size += sizeof (Elf64_External_Rela);
|
||
htab->tlsdesc_plt = (bfd_vma) -1;
|
||
}
|
||
}
|
||
else
|
||
h->got.offset = (bfd_vma) -1;
|
||
|
||
if (eh->dyn_relocs == NULL)
|
||
return TRUE;
|
||
|
||
/* In the shared -Bsymbolic case, discard space allocated for
|
||
dynamic pc-relative relocs against symbols which turn out to be
|
||
defined in regular objects. For the normal shared case, discard
|
||
space for pc-relative relocs that have become local due to symbol
|
||
visibility changes. */
|
||
|
||
if (info->shared)
|
||
{
|
||
/* Relocs that use pc_count are those that appear on a call
|
||
insn, or certain REL relocs that can generated via assembly.
|
||
We want calls to protected symbols to resolve directly to the
|
||
function rather than going via the plt. If people want
|
||
function pointer comparisons to work as expected then they
|
||
should avoid writing weird assembly. */
|
||
if (SYMBOL_CALLS_LOCAL (info, h))
|
||
{
|
||
struct elf64_x86_64_dyn_relocs **pp;
|
||
|
||
for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
|
||
{
|
||
p->count -= p->pc_count;
|
||
p->pc_count = 0;
|
||
if (p->count == 0)
|
||
*pp = p->next;
|
||
else
|
||
pp = &p->next;
|
||
}
|
||
}
|
||
|
||
/* Also discard relocs on undefined weak syms with non-default
|
||
visibility. */
|
||
if (eh->dyn_relocs != NULL
|
||
&& h->root.type == bfd_link_hash_undefweak)
|
||
{
|
||
if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
|
||
eh->dyn_relocs = NULL;
|
||
|
||
/* Make sure undefined weak symbols are output as a dynamic
|
||
symbol in PIEs. */
|
||
else if (h->dynindx == -1
|
||
&& !h->forced_local)
|
||
{
|
||
if (! bfd_elf_link_record_dynamic_symbol (info, h))
|
||
return FALSE;
|
||
}
|
||
}
|
||
}
|
||
else if (ELIMINATE_COPY_RELOCS)
|
||
{
|
||
/* For the non-shared case, discard space for relocs against
|
||
symbols which turn out to need copy relocs or are not
|
||
dynamic. */
|
||
|
||
if (!h->non_got_ref
|
||
&& ((h->def_dynamic
|
||
&& !h->def_regular)
|
||
|| (htab->elf.dynamic_sections_created
|
||
&& (h->root.type == bfd_link_hash_undefweak
|
||
|| h->root.type == bfd_link_hash_undefined))))
|
||
{
|
||
/* Make sure this symbol is output as a dynamic symbol.
|
||
Undefined weak syms won't yet be marked as dynamic. */
|
||
if (h->dynindx == -1
|
||
&& !h->forced_local)
|
||
{
|
||
if (! bfd_elf_link_record_dynamic_symbol (info, h))
|
||
return FALSE;
|
||
}
|
||
|
||
/* If that succeeded, we know we'll be keeping all the
|
||
relocs. */
|
||
if (h->dynindx != -1)
|
||
goto keep;
|
||
}
|
||
|
||
eh->dyn_relocs = NULL;
|
||
|
||
keep: ;
|
||
}
|
||
|
||
/* Finally, allocate space. */
|
||
for (p = eh->dyn_relocs; p != NULL; p = p->next)
|
||
{
|
||
asection *sreloc = elf_section_data (p->sec)->sreloc;
|
||
sreloc->size += p->count * sizeof (Elf64_External_Rela);
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Find any dynamic relocs that apply to read-only sections. */
|
||
|
||
static bfd_boolean
|
||
readonly_dynrelocs (struct elf_link_hash_entry *h, void * inf)
|
||
{
|
||
struct elf64_x86_64_link_hash_entry *eh;
|
||
struct elf64_x86_64_dyn_relocs *p;
|
||
|
||
if (h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
|
||
eh = (struct elf64_x86_64_link_hash_entry *) h;
|
||
for (p = eh->dyn_relocs; p != NULL; p = p->next)
|
||
{
|
||
asection *s = p->sec->output_section;
|
||
|
||
if (s != NULL && (s->flags & SEC_READONLY) != 0)
|
||
{
|
||
struct bfd_link_info *info = (struct bfd_link_info *) inf;
|
||
|
||
info->flags |= DF_TEXTREL;
|
||
|
||
/* Not an error, just cut short the traversal. */
|
||
return FALSE;
|
||
}
|
||
}
|
||
return TRUE;
|
||
}
|
||
|
||
/* Set the sizes of the dynamic sections. */
|
||
|
||
static bfd_boolean
|
||
elf64_x86_64_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
|
||
struct bfd_link_info *info)
|
||
{
|
||
struct elf64_x86_64_link_hash_table *htab;
|
||
bfd *dynobj;
|
||
asection *s;
|
||
bfd_boolean relocs;
|
||
bfd *ibfd;
|
||
|
||
htab = elf64_x86_64_hash_table (info);
|
||
dynobj = htab->elf.dynobj;
|
||
if (dynobj == NULL)
|
||
abort ();
|
||
|
||
if (htab->elf.dynamic_sections_created)
|
||
{
|
||
/* Set the contents of the .interp section to the interpreter. */
|
||
if (info->executable)
|
||
{
|
||
s = bfd_get_section_by_name (dynobj, ".interp");
|
||
if (s == NULL)
|
||
abort ();
|
||
s->size = sizeof ELF_DYNAMIC_INTERPRETER;
|
||
s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
|
||
}
|
||
}
|
||
|
||
/* Set up .got offsets for local syms, and space for local dynamic
|
||
relocs. */
|
||
for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
|
||
{
|
||
bfd_signed_vma *local_got;
|
||
bfd_signed_vma *end_local_got;
|
||
char *local_tls_type;
|
||
bfd_vma *local_tlsdesc_gotent;
|
||
bfd_size_type locsymcount;
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
asection *srel;
|
||
|
||
if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
|
||
continue;
|
||
|
||
for (s = ibfd->sections; s != NULL; s = s->next)
|
||
{
|
||
struct elf64_x86_64_dyn_relocs *p;
|
||
|
||
for (p = (struct elf64_x86_64_dyn_relocs *)
|
||
(elf_section_data (s)->local_dynrel);
|
||
p != NULL;
|
||
p = p->next)
|
||
{
|
||
if (!bfd_is_abs_section (p->sec)
|
||
&& bfd_is_abs_section (p->sec->output_section))
|
||
{
|
||
/* Input section has been discarded, either because
|
||
it is a copy of a linkonce section or due to
|
||
linker script /DISCARD/, so we'll be discarding
|
||
the relocs too. */
|
||
}
|
||
else if (p->count != 0)
|
||
{
|
||
srel = elf_section_data (p->sec)->sreloc;
|
||
srel->size += p->count * sizeof (Elf64_External_Rela);
|
||
if ((p->sec->output_section->flags & SEC_READONLY) != 0)
|
||
info->flags |= DF_TEXTREL;
|
||
|
||
}
|
||
}
|
||
}
|
||
|
||
local_got = elf_local_got_refcounts (ibfd);
|
||
if (!local_got)
|
||
continue;
|
||
|
||
symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
|
||
locsymcount = symtab_hdr->sh_info;
|
||
end_local_got = local_got + locsymcount;
|
||
local_tls_type = elf64_x86_64_local_got_tls_type (ibfd);
|
||
local_tlsdesc_gotent = elf64_x86_64_local_tlsdesc_gotent (ibfd);
|
||
s = htab->sgot;
|
||
srel = htab->srelgot;
|
||
for (; local_got < end_local_got;
|
||
++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
|
||
{
|
||
*local_tlsdesc_gotent = (bfd_vma) -1;
|
||
if (*local_got > 0)
|
||
{
|
||
if (GOT_TLS_GDESC_P (*local_tls_type))
|
||
{
|
||
*local_tlsdesc_gotent = htab->sgotplt->size
|
||
- elf64_x86_64_compute_jump_table_size (htab);
|
||
htab->sgotplt->size += 2 * GOT_ENTRY_SIZE;
|
||
*local_got = (bfd_vma) -2;
|
||
}
|
||
if (! GOT_TLS_GDESC_P (*local_tls_type)
|
||
|| GOT_TLS_GD_P (*local_tls_type))
|
||
{
|
||
*local_got = s->size;
|
||
s->size += GOT_ENTRY_SIZE;
|
||
if (GOT_TLS_GD_P (*local_tls_type))
|
||
s->size += GOT_ENTRY_SIZE;
|
||
}
|
||
if (info->shared
|
||
|| GOT_TLS_GD_ANY_P (*local_tls_type)
|
||
|| *local_tls_type == GOT_TLS_IE)
|
||
{
|
||
if (GOT_TLS_GDESC_P (*local_tls_type))
|
||
{
|
||
htab->srelplt->size += sizeof (Elf64_External_Rela);
|
||
htab->tlsdesc_plt = (bfd_vma) -1;
|
||
}
|
||
if (! GOT_TLS_GDESC_P (*local_tls_type)
|
||
|| GOT_TLS_GD_P (*local_tls_type))
|
||
srel->size += sizeof (Elf64_External_Rela);
|
||
}
|
||
}
|
||
else
|
||
*local_got = (bfd_vma) -1;
|
||
}
|
||
}
|
||
|
||
if (htab->tls_ld_got.refcount > 0)
|
||
{
|
||
/* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
|
||
relocs. */
|
||
htab->tls_ld_got.offset = htab->sgot->size;
|
||
htab->sgot->size += 2 * GOT_ENTRY_SIZE;
|
||
htab->srelgot->size += sizeof (Elf64_External_Rela);
|
||
}
|
||
else
|
||
htab->tls_ld_got.offset = -1;
|
||
|
||
/* Allocate global sym .plt and .got entries, and space for global
|
||
sym dynamic relocs. */
|
||
elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
|
||
|
||
/* For every jump slot reserved in the sgotplt, reloc_count is
|
||
incremented. However, when we reserve space for TLS descriptors,
|
||
it's not incremented, so in order to compute the space reserved
|
||
for them, it suffices to multiply the reloc count by the jump
|
||
slot size. */
|
||
if (htab->srelplt)
|
||
htab->sgotplt_jump_table_size
|
||
= elf64_x86_64_compute_jump_table_size (htab);
|
||
|
||
if (htab->tlsdesc_plt)
|
||
{
|
||
/* If we're not using lazy TLS relocations, don't generate the
|
||
PLT and GOT entries they require. */
|
||
if ((info->flags & DF_BIND_NOW))
|
||
htab->tlsdesc_plt = 0;
|
||
else
|
||
{
|
||
htab->tlsdesc_got = htab->sgot->size;
|
||
htab->sgot->size += GOT_ENTRY_SIZE;
|
||
/* Reserve room for the initial entry.
|
||
FIXME: we could probably do away with it in this case. */
|
||
if (htab->splt->size == 0)
|
||
htab->splt->size += PLT_ENTRY_SIZE;
|
||
htab->tlsdesc_plt = htab->splt->size;
|
||
htab->splt->size += PLT_ENTRY_SIZE;
|
||
}
|
||
}
|
||
|
||
/* We now have determined the sizes of the various dynamic sections.
|
||
Allocate memory for them. */
|
||
relocs = FALSE;
|
||
for (s = dynobj->sections; s != NULL; s = s->next)
|
||
{
|
||
if ((s->flags & SEC_LINKER_CREATED) == 0)
|
||
continue;
|
||
|
||
if (s == htab->splt
|
||
|| s == htab->sgot
|
||
|| s == htab->sgotplt
|
||
|| s == htab->sdynbss)
|
||
{
|
||
/* Strip this section if we don't need it; see the
|
||
comment below. */
|
||
}
|
||
else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
|
||
{
|
||
if (s->size != 0 && s != htab->srelplt)
|
||
relocs = TRUE;
|
||
|
||
/* We use the reloc_count field as a counter if we need
|
||
to copy relocs into the output file. */
|
||
if (s != htab->srelplt)
|
||
s->reloc_count = 0;
|
||
}
|
||
else
|
||
{
|
||
/* It's not one of our sections, so don't allocate space. */
|
||
continue;
|
||
}
|
||
|
||
if (s->size == 0)
|
||
{
|
||
/* If we don't need this section, strip it from the
|
||
output file. This is mostly to handle .rela.bss and
|
||
.rela.plt. We must create both sections in
|
||
create_dynamic_sections, because they must be created
|
||
before the linker maps input sections to output
|
||
sections. The linker does that before
|
||
adjust_dynamic_symbol is called, and it is that
|
||
function which decides whether anything needs to go
|
||
into these sections. */
|
||
|
||
s->flags |= SEC_EXCLUDE;
|
||
continue;
|
||
}
|
||
|
||
if ((s->flags & SEC_HAS_CONTENTS) == 0)
|
||
continue;
|
||
|
||
/* Allocate memory for the section contents. We use bfd_zalloc
|
||
here in case unused entries are not reclaimed before the
|
||
section's contents are written out. This should not happen,
|
||
but this way if it does, we get a R_X86_64_NONE reloc instead
|
||
of garbage. */
|
||
s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
|
||
if (s->contents == NULL)
|
||
return FALSE;
|
||
}
|
||
|
||
if (htab->elf.dynamic_sections_created)
|
||
{
|
||
/* Add some entries to the .dynamic section. We fill in the
|
||
values later, in elf64_x86_64_finish_dynamic_sections, but we
|
||
must add the entries now so that we get the correct size for
|
||
the .dynamic section. The DT_DEBUG entry is filled in by the
|
||
dynamic linker and used by the debugger. */
|
||
#define add_dynamic_entry(TAG, VAL) \
|
||
_bfd_elf_add_dynamic_entry (info, TAG, VAL)
|
||
|
||
if (info->executable)
|
||
{
|
||
if (!add_dynamic_entry (DT_DEBUG, 0))
|
||
return FALSE;
|
||
}
|
||
|
||
if (htab->splt->size != 0)
|
||
{
|
||
if (!add_dynamic_entry (DT_PLTGOT, 0)
|
||
|| !add_dynamic_entry (DT_PLTRELSZ, 0)
|
||
|| !add_dynamic_entry (DT_PLTREL, DT_RELA)
|
||
|| !add_dynamic_entry (DT_JMPREL, 0))
|
||
return FALSE;
|
||
|
||
if (htab->tlsdesc_plt
|
||
&& (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
|
||
|| !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
|
||
return FALSE;
|
||
}
|
||
|
||
if (relocs)
|
||
{
|
||
if (!add_dynamic_entry (DT_RELA, 0)
|
||
|| !add_dynamic_entry (DT_RELASZ, 0)
|
||
|| !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
|
||
return FALSE;
|
||
|
||
/* If any dynamic relocs apply to a read-only section,
|
||
then we need a DT_TEXTREL entry. */
|
||
if ((info->flags & DF_TEXTREL) == 0)
|
||
elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
|
||
(PTR) info);
|
||
|
||
if ((info->flags & DF_TEXTREL) != 0)
|
||
{
|
||
if (!add_dynamic_entry (DT_TEXTREL, 0))
|
||
return FALSE;
|
||
}
|
||
}
|
||
}
|
||
#undef add_dynamic_entry
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
static bfd_boolean
|
||
elf64_x86_64_always_size_sections (bfd *output_bfd,
|
||
struct bfd_link_info *info)
|
||
{
|
||
asection *tls_sec = elf_hash_table (info)->tls_sec;
|
||
|
||
if (tls_sec)
|
||
{
|
||
struct elf_link_hash_entry *tlsbase;
|
||
|
||
tlsbase = elf_link_hash_lookup (elf_hash_table (info),
|
||
"_TLS_MODULE_BASE_",
|
||
FALSE, FALSE, FALSE);
|
||
|
||
if (tlsbase && tlsbase->type == STT_TLS)
|
||
{
|
||
struct bfd_link_hash_entry *bh = NULL;
|
||
const struct elf_backend_data *bed
|
||
= get_elf_backend_data (output_bfd);
|
||
|
||
if (!(_bfd_generic_link_add_one_symbol
|
||
(info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
|
||
tls_sec, 0, NULL, FALSE,
|
||
bed->collect, &bh)))
|
||
return FALSE;
|
||
tlsbase = (struct elf_link_hash_entry *)bh;
|
||
tlsbase->def_regular = 1;
|
||
tlsbase->other = STV_HIDDEN;
|
||
(*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
|
||
}
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Return the base VMA address which should be subtracted from real addresses
|
||
when resolving @dtpoff relocation.
|
||
This is PT_TLS segment p_vaddr. */
|
||
|
||
static bfd_vma
|
||
dtpoff_base (struct bfd_link_info *info)
|
||
{
|
||
/* If tls_sec is NULL, we should have signalled an error already. */
|
||
if (elf_hash_table (info)->tls_sec == NULL)
|
||
return 0;
|
||
return elf_hash_table (info)->tls_sec->vma;
|
||
}
|
||
|
||
/* Return the relocation value for @tpoff relocation
|
||
if STT_TLS virtual address is ADDRESS. */
|
||
|
||
static bfd_vma
|
||
tpoff (struct bfd_link_info *info, bfd_vma address)
|
||
{
|
||
struct elf_link_hash_table *htab = elf_hash_table (info);
|
||
|
||
/* If tls_segment is NULL, we should have signalled an error already. */
|
||
if (htab->tls_sec == NULL)
|
||
return 0;
|
||
return address - htab->tls_size - htab->tls_sec->vma;
|
||
}
|
||
|
||
/* Is the instruction before OFFSET in CONTENTS a 32bit relative
|
||
branch? */
|
||
|
||
static bfd_boolean
|
||
is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset)
|
||
{
|
||
/* Opcode Instruction
|
||
0xe8 call
|
||
0xe9 jump
|
||
0x0f 0x8x conditional jump */
|
||
return ((offset > 0
|
||
&& (contents [offset - 1] == 0xe8
|
||
|| contents [offset - 1] == 0xe9))
|
||
|| (offset > 1
|
||
&& contents [offset - 2] == 0x0f
|
||
&& (contents [offset - 1] & 0xf0) == 0x80));
|
||
}
|
||
|
||
/* Relocate an x86_64 ELF section. */
|
||
|
||
static bfd_boolean
|
||
elf64_x86_64_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
|
||
bfd *input_bfd, asection *input_section,
|
||
bfd_byte *contents, Elf_Internal_Rela *relocs,
|
||
Elf_Internal_Sym *local_syms,
|
||
asection **local_sections)
|
||
{
|
||
struct elf64_x86_64_link_hash_table *htab;
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
struct elf_link_hash_entry **sym_hashes;
|
||
bfd_vma *local_got_offsets;
|
||
bfd_vma *local_tlsdesc_gotents;
|
||
Elf_Internal_Rela *rel;
|
||
Elf_Internal_Rela *relend;
|
||
|
||
htab = elf64_x86_64_hash_table (info);
|
||
symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
|
||
sym_hashes = elf_sym_hashes (input_bfd);
|
||
local_got_offsets = elf_local_got_offsets (input_bfd);
|
||
local_tlsdesc_gotents = elf64_x86_64_local_tlsdesc_gotent (input_bfd);
|
||
|
||
rel = relocs;
|
||
relend = relocs + input_section->reloc_count;
|
||
for (; rel < relend; rel++)
|
||
{
|
||
unsigned int r_type;
|
||
reloc_howto_type *howto;
|
||
unsigned long r_symndx;
|
||
struct elf_link_hash_entry *h;
|
||
Elf_Internal_Sym *sym;
|
||
asection *sec;
|
||
bfd_vma off, offplt;
|
||
bfd_vma relocation;
|
||
bfd_boolean unresolved_reloc;
|
||
bfd_reloc_status_type r;
|
||
int tls_type;
|
||
|
||
r_type = ELF64_R_TYPE (rel->r_info);
|
||
if (r_type == (int) R_X86_64_GNU_VTINHERIT
|
||
|| r_type == (int) R_X86_64_GNU_VTENTRY)
|
||
continue;
|
||
|
||
if (r_type >= R_X86_64_max)
|
||
{
|
||
bfd_set_error (bfd_error_bad_value);
|
||
return FALSE;
|
||
}
|
||
|
||
howto = x86_64_elf_howto_table + r_type;
|
||
r_symndx = ELF64_R_SYM (rel->r_info);
|
||
h = NULL;
|
||
sym = NULL;
|
||
sec = NULL;
|
||
unresolved_reloc = FALSE;
|
||
if (r_symndx < symtab_hdr->sh_info)
|
||
{
|
||
sym = local_syms + r_symndx;
|
||
sec = local_sections[r_symndx];
|
||
|
||
relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
|
||
}
|
||
else
|
||
{
|
||
bfd_boolean warned;
|
||
|
||
RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
|
||
r_symndx, symtab_hdr, sym_hashes,
|
||
h, sec, relocation,
|
||
unresolved_reloc, warned);
|
||
}
|
||
|
||
if (sec != NULL && elf_discarded_section (sec))
|
||
{
|
||
/* For relocs against symbols from removed linkonce sections,
|
||
or sections discarded by a linker script, we just want the
|
||
section contents zeroed. Avoid any special processing. */
|
||
_bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
|
||
rel->r_info = 0;
|
||
rel->r_addend = 0;
|
||
continue;
|
||
}
|
||
|
||
if (info->relocatable)
|
||
continue;
|
||
|
||
/* When generating a shared object, the relocations handled here are
|
||
copied into the output file to be resolved at run time. */
|
||
switch (r_type)
|
||
{
|
||
asection *base_got;
|
||
case R_X86_64_GOT32:
|
||
case R_X86_64_GOT64:
|
||
/* Relocation is to the entry for this symbol in the global
|
||
offset table. */
|
||
case R_X86_64_GOTPCREL:
|
||
case R_X86_64_GOTPCREL64:
|
||
/* Use global offset table entry as symbol value. */
|
||
case R_X86_64_GOTPLT64:
|
||
/* This is the same as GOT64 for relocation purposes, but
|
||
indicates the existence of a PLT entry. The difficulty is,
|
||
that we must calculate the GOT slot offset from the PLT
|
||
offset, if this symbol got a PLT entry (it was global).
|
||
Additionally if it's computed from the PLT entry, then that
|
||
GOT offset is relative to .got.plt, not to .got. */
|
||
base_got = htab->sgot;
|
||
|
||
if (htab->sgot == NULL)
|
||
abort ();
|
||
|
||
if (h != NULL)
|
||
{
|
||
bfd_boolean dyn;
|
||
|
||
off = h->got.offset;
|
||
if (h->needs_plt
|
||
&& h->plt.offset != (bfd_vma)-1
|
||
&& off == (bfd_vma)-1)
|
||
{
|
||
/* We can't use h->got.offset here to save
|
||
state, or even just remember the offset, as
|
||
finish_dynamic_symbol would use that as offset into
|
||
.got. */
|
||
bfd_vma plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
|
||
off = (plt_index + 3) * GOT_ENTRY_SIZE;
|
||
base_got = htab->sgotplt;
|
||
}
|
||
|
||
dyn = htab->elf.dynamic_sections_created;
|
||
|
||
if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
|
||
|| (info->shared
|
||
&& SYMBOL_REFERENCES_LOCAL (info, h))
|
||
|| (ELF_ST_VISIBILITY (h->other)
|
||
&& h->root.type == bfd_link_hash_undefweak))
|
||
{
|
||
/* This is actually a static link, or it is a -Bsymbolic
|
||
link and the symbol is defined locally, or the symbol
|
||
was forced to be local because of a version file. We
|
||
must initialize this entry in the global offset table.
|
||
Since the offset must always be a multiple of 8, we
|
||
use the least significant bit to record whether we
|
||
have initialized it already.
|
||
|
||
When doing a dynamic link, we create a .rela.got
|
||
relocation entry to initialize the value. This is
|
||
done in the finish_dynamic_symbol routine. */
|
||
if ((off & 1) != 0)
|
||
off &= ~1;
|
||
else
|
||
{
|
||
bfd_put_64 (output_bfd, relocation,
|
||
base_got->contents + off);
|
||
/* Note that this is harmless for the GOTPLT64 case,
|
||
as -1 | 1 still is -1. */
|
||
h->got.offset |= 1;
|
||
}
|
||
}
|
||
else
|
||
unresolved_reloc = FALSE;
|
||
}
|
||
else
|
||
{
|
||
if (local_got_offsets == NULL)
|
||
abort ();
|
||
|
||
off = local_got_offsets[r_symndx];
|
||
|
||
/* The offset must always be a multiple of 8. We use
|
||
the least significant bit to record whether we have
|
||
already generated the necessary reloc. */
|
||
if ((off & 1) != 0)
|
||
off &= ~1;
|
||
else
|
||
{
|
||
bfd_put_64 (output_bfd, relocation,
|
||
base_got->contents + off);
|
||
|
||
if (info->shared)
|
||
{
|
||
asection *s;
|
||
Elf_Internal_Rela outrel;
|
||
bfd_byte *loc;
|
||
|
||
/* We need to generate a R_X86_64_RELATIVE reloc
|
||
for the dynamic linker. */
|
||
s = htab->srelgot;
|
||
if (s == NULL)
|
||
abort ();
|
||
|
||
outrel.r_offset = (base_got->output_section->vma
|
||
+ base_got->output_offset
|
||
+ off);
|
||
outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
|
||
outrel.r_addend = relocation;
|
||
loc = s->contents;
|
||
loc += s->reloc_count++ * sizeof (Elf64_External_Rela);
|
||
bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
|
||
}
|
||
|
||
local_got_offsets[r_symndx] |= 1;
|
||
}
|
||
}
|
||
|
||
if (off >= (bfd_vma) -2)
|
||
abort ();
|
||
|
||
relocation = base_got->output_section->vma
|
||
+ base_got->output_offset + off;
|
||
if (r_type != R_X86_64_GOTPCREL && r_type != R_X86_64_GOTPCREL64)
|
||
relocation -= htab->sgotplt->output_section->vma
|
||
- htab->sgotplt->output_offset;
|
||
|
||
break;
|
||
|
||
case R_X86_64_GOTOFF64:
|
||
/* Relocation is relative to the start of the global offset
|
||
table. */
|
||
|
||
/* Check to make sure it isn't a protected function symbol
|
||
for shared library since it may not be local when used
|
||
as function address. */
|
||
if (info->shared
|
||
&& h
|
||
&& h->def_regular
|
||
&& h->type == STT_FUNC
|
||
&& ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
|
||
input_bfd, h->root.root.string);
|
||
bfd_set_error (bfd_error_bad_value);
|
||
return FALSE;
|
||
}
|
||
|
||
/* Note that sgot is not involved in this
|
||
calculation. We always want the start of .got.plt. If we
|
||
defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
|
||
permitted by the ABI, we might have to change this
|
||
calculation. */
|
||
relocation -= htab->sgotplt->output_section->vma
|
||
+ htab->sgotplt->output_offset;
|
||
break;
|
||
|
||
case R_X86_64_GOTPC32:
|
||
case R_X86_64_GOTPC64:
|
||
/* Use global offset table as symbol value. */
|
||
relocation = htab->sgotplt->output_section->vma
|
||
+ htab->sgotplt->output_offset;
|
||
unresolved_reloc = FALSE;
|
||
break;
|
||
|
||
case R_X86_64_PLTOFF64:
|
||
/* Relocation is PLT entry relative to GOT. For local
|
||
symbols it's the symbol itself relative to GOT. */
|
||
if (h != NULL
|
||
/* See PLT32 handling. */
|
||
&& h->plt.offset != (bfd_vma) -1
|
||
&& htab->splt != NULL)
|
||
{
|
||
relocation = (htab->splt->output_section->vma
|
||
+ htab->splt->output_offset
|
||
+ h->plt.offset);
|
||
unresolved_reloc = FALSE;
|
||
}
|
||
|
||
relocation -= htab->sgotplt->output_section->vma
|
||
+ htab->sgotplt->output_offset;
|
||
break;
|
||
|
||
case R_X86_64_PLT32:
|
||
/* Relocation is to the entry for this symbol in the
|
||
procedure linkage table. */
|
||
|
||
/* Resolve a PLT32 reloc against a local symbol directly,
|
||
without using the procedure linkage table. */
|
||
if (h == NULL)
|
||
break;
|
||
|
||
if (h->plt.offset == (bfd_vma) -1
|
||
|| htab->splt == NULL)
|
||
{
|
||
/* We didn't make a PLT entry for this symbol. This
|
||
happens when statically linking PIC code, or when
|
||
using -Bsymbolic. */
|
||
break;
|
||
}
|
||
|
||
relocation = (htab->splt->output_section->vma
|
||
+ htab->splt->output_offset
|
||
+ h->plt.offset);
|
||
unresolved_reloc = FALSE;
|
||
break;
|
||
|
||
case R_X86_64_PC8:
|
||
case R_X86_64_PC16:
|
||
case R_X86_64_PC32:
|
||
if (info->shared
|
||
&& !SYMBOL_REFERENCES_LOCAL (info, h)
|
||
&& (input_section->flags & SEC_ALLOC) != 0
|
||
&& (input_section->flags & SEC_READONLY) != 0
|
||
&& (!h->def_regular
|
||
|| r_type != R_X86_64_PC32
|
||
|| h->type != STT_FUNC
|
||
|| ELF_ST_VISIBILITY (h->other) != STV_PROTECTED
|
||
|| !is_32bit_relative_branch (contents,
|
||
rel->r_offset)))
|
||
{
|
||
if (h->def_regular
|
||
&& r_type == R_X86_64_PC32
|
||
&& h->type == STT_FUNC
|
||
&& ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
|
||
(*_bfd_error_handler)
|
||
(_("%B: relocation R_X86_64_PC32 against protected function `%s' can not be used when making a shared object"),
|
||
input_bfd, h->root.root.string);
|
||
else
|
||
(*_bfd_error_handler)
|
||
(_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
|
||
input_bfd, x86_64_elf_howto_table[r_type].name,
|
||
h->root.root.string);
|
||
bfd_set_error (bfd_error_bad_value);
|
||
return FALSE;
|
||
}
|
||
/* Fall through. */
|
||
|
||
case R_X86_64_8:
|
||
case R_X86_64_16:
|
||
case R_X86_64_32:
|
||
case R_X86_64_PC64:
|
||
case R_X86_64_64:
|
||
/* FIXME: The ABI says the linker should make sure the value is
|
||
the same when it's zeroextended to 64 bit. */
|
||
|
||
if ((input_section->flags & SEC_ALLOC) == 0)
|
||
break;
|
||
|
||
if ((info->shared
|
||
&& (h == NULL
|
||
|| ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
|
||
|| h->root.type != bfd_link_hash_undefweak)
|
||
&& ((r_type != R_X86_64_PC8
|
||
&& r_type != R_X86_64_PC16
|
||
&& r_type != R_X86_64_PC32
|
||
&& r_type != R_X86_64_PC64)
|
||
|| !SYMBOL_CALLS_LOCAL (info, h)))
|
||
|| (ELIMINATE_COPY_RELOCS
|
||
&& !info->shared
|
||
&& h != NULL
|
||
&& h->dynindx != -1
|
||
&& !h->non_got_ref
|
||
&& ((h->def_dynamic
|
||
&& !h->def_regular)
|
||
|| h->root.type == bfd_link_hash_undefweak
|
||
|| h->root.type == bfd_link_hash_undefined)))
|
||
{
|
||
Elf_Internal_Rela outrel;
|
||
bfd_byte *loc;
|
||
bfd_boolean skip, relocate;
|
||
asection *sreloc;
|
||
|
||
/* When generating a shared object, these relocations
|
||
are copied into the output file to be resolved at run
|
||
time. */
|
||
skip = FALSE;
|
||
relocate = FALSE;
|
||
|
||
outrel.r_offset =
|
||
_bfd_elf_section_offset (output_bfd, info, input_section,
|
||
rel->r_offset);
|
||
if (outrel.r_offset == (bfd_vma) -1)
|
||
skip = TRUE;
|
||
else if (outrel.r_offset == (bfd_vma) -2)
|
||
skip = TRUE, relocate = TRUE;
|
||
|
||
outrel.r_offset += (input_section->output_section->vma
|
||
+ input_section->output_offset);
|
||
|
||
if (skip)
|
||
memset (&outrel, 0, sizeof outrel);
|
||
|
||
/* h->dynindx may be -1 if this symbol was marked to
|
||
become local. */
|
||
else if (h != NULL
|
||
&& h->dynindx != -1
|
||
&& (r_type == R_X86_64_PC8
|
||
|| r_type == R_X86_64_PC16
|
||
|| r_type == R_X86_64_PC32
|
||
|| r_type == R_X86_64_PC64
|
||
|| !info->shared
|
||
|| !SYMBOLIC_BIND (info, h)
|
||
|| !h->def_regular))
|
||
{
|
||
outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
|
||
outrel.r_addend = rel->r_addend;
|
||
}
|
||
else
|
||
{
|
||
/* This symbol is local, or marked to become local. */
|
||
if (r_type == R_X86_64_64)
|
||
{
|
||
relocate = TRUE;
|
||
outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
|
||
outrel.r_addend = relocation + rel->r_addend;
|
||
}
|
||
else
|
||
{
|
||
long sindx;
|
||
|
||
if (bfd_is_abs_section (sec))
|
||
sindx = 0;
|
||
else if (sec == NULL || sec->owner == NULL)
|
||
{
|
||
bfd_set_error (bfd_error_bad_value);
|
||
return FALSE;
|
||
}
|
||
else
|
||
{
|
||
asection *osec;
|
||
|
||
/* We are turning this relocation into one
|
||
against a section symbol. It would be
|
||
proper to subtract the symbol's value,
|
||
osec->vma, from the emitted reloc addend,
|
||
but ld.so expects buggy relocs. */
|
||
osec = sec->output_section;
|
||
sindx = elf_section_data (osec)->dynindx;
|
||
if (sindx == 0)
|
||
{
|
||
asection *oi = htab->elf.text_index_section;
|
||
sindx = elf_section_data (oi)->dynindx;
|
||
}
|
||
BFD_ASSERT (sindx != 0);
|
||
}
|
||
|
||
outrel.r_info = ELF64_R_INFO (sindx, r_type);
|
||
outrel.r_addend = relocation + rel->r_addend;
|
||
}
|
||
}
|
||
|
||
sreloc = elf_section_data (input_section)->sreloc;
|
||
if (sreloc == NULL)
|
||
abort ();
|
||
|
||
loc = sreloc->contents;
|
||
loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
|
||
bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
|
||
|
||
/* If this reloc is against an external symbol, we do
|
||
not want to fiddle with the addend. Otherwise, we
|
||
need to include the symbol value so that it becomes
|
||
an addend for the dynamic reloc. */
|
||
if (! relocate)
|
||
continue;
|
||
}
|
||
|
||
break;
|
||
|
||
case R_X86_64_TLSGD:
|
||
case R_X86_64_GOTPC32_TLSDESC:
|
||
case R_X86_64_TLSDESC_CALL:
|
||
case R_X86_64_GOTTPOFF:
|
||
tls_type = GOT_UNKNOWN;
|
||
if (h == NULL && local_got_offsets)
|
||
tls_type = elf64_x86_64_local_got_tls_type (input_bfd) [r_symndx];
|
||
else if (h != NULL)
|
||
tls_type = elf64_x86_64_hash_entry (h)->tls_type;
|
||
|
||
if (! elf64_x86_64_tls_transition (info, input_bfd,
|
||
input_section, contents,
|
||
symtab_hdr, sym_hashes,
|
||
&r_type, tls_type, rel,
|
||
relend, h))
|
||
return FALSE;
|
||
|
||
if (r_type == R_X86_64_TPOFF32)
|
||
{
|
||
bfd_vma roff = rel->r_offset;
|
||
|
||
BFD_ASSERT (! unresolved_reloc);
|
||
|
||
if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
|
||
{
|
||
/* GD->LE transition.
|
||
.byte 0x66; leaq foo@tlsgd(%rip), %rdi
|
||
.word 0x6666; rex64; call __tls_get_addr
|
||
Change it into:
|
||
movq %fs:0, %rax
|
||
leaq foo@tpoff(%rax), %rax */
|
||
memcpy (contents + roff - 4,
|
||
"\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
|
||
16);
|
||
bfd_put_32 (output_bfd, tpoff (info, relocation),
|
||
contents + roff + 8);
|
||
/* Skip R_X86_64_PC32/R_X86_64_PLT32. */
|
||
rel++;
|
||
continue;
|
||
}
|
||
else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
|
||
{
|
||
/* GDesc -> LE transition.
|
||
It's originally something like:
|
||
leaq x@tlsdesc(%rip), %rax
|
||
|
||
Change it to:
|
||
movl $x@tpoff, %rax
|
||
*/
|
||
|
||
unsigned int val, type, type2;
|
||
|
||
type = bfd_get_8 (input_bfd, contents + roff - 3);
|
||
type2 = bfd_get_8 (input_bfd, contents + roff - 2);
|
||
val = bfd_get_8 (input_bfd, contents + roff - 1);
|
||
bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1),
|
||
contents + roff - 3);
|
||
bfd_put_8 (output_bfd, 0xc7, contents + roff - 2);
|
||
bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
|
||
contents + roff - 1);
|
||
bfd_put_32 (output_bfd, tpoff (info, relocation),
|
||
contents + roff);
|
||
continue;
|
||
}
|
||
else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
|
||
{
|
||
/* GDesc -> LE transition.
|
||
It's originally:
|
||
call *(%rax)
|
||
Turn it into:
|
||
xchg %ax,%ax. */
|
||
bfd_put_8 (output_bfd, 0x66, contents + roff);
|
||
bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
|
||
continue;
|
||
}
|
||
else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF)
|
||
{
|
||
/* IE->LE transition:
|
||
Originally it can be one of:
|
||
movq foo@gottpoff(%rip), %reg
|
||
addq foo@gottpoff(%rip), %reg
|
||
We change it into:
|
||
movq $foo, %reg
|
||
leaq foo(%reg), %reg
|
||
addq $foo, %reg. */
|
||
|
||
unsigned int val, type, reg;
|
||
|
||
val = bfd_get_8 (input_bfd, contents + roff - 3);
|
||
type = bfd_get_8 (input_bfd, contents + roff - 2);
|
||
reg = bfd_get_8 (input_bfd, contents + roff - 1);
|
||
reg >>= 3;
|
||
if (type == 0x8b)
|
||
{
|
||
/* movq */
|
||
if (val == 0x4c)
|
||
bfd_put_8 (output_bfd, 0x49,
|
||
contents + roff - 3);
|
||
bfd_put_8 (output_bfd, 0xc7,
|
||
contents + roff - 2);
|
||
bfd_put_8 (output_bfd, 0xc0 | reg,
|
||
contents + roff - 1);
|
||
}
|
||
else if (reg == 4)
|
||
{
|
||
/* addq -> addq - addressing with %rsp/%r12 is
|
||
special */
|
||
if (val == 0x4c)
|
||
bfd_put_8 (output_bfd, 0x49,
|
||
contents + roff - 3);
|
||
bfd_put_8 (output_bfd, 0x81,
|
||
contents + roff - 2);
|
||
bfd_put_8 (output_bfd, 0xc0 | reg,
|
||
contents + roff - 1);
|
||
}
|
||
else
|
||
{
|
||
/* addq -> leaq */
|
||
if (val == 0x4c)
|
||
bfd_put_8 (output_bfd, 0x4d,
|
||
contents + roff - 3);
|
||
bfd_put_8 (output_bfd, 0x8d,
|
||
contents + roff - 2);
|
||
bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
|
||
contents + roff - 1);
|
||
}
|
||
bfd_put_32 (output_bfd, tpoff (info, relocation),
|
||
contents + roff);
|
||
continue;
|
||
}
|
||
else
|
||
BFD_ASSERT (FALSE);
|
||
}
|
||
|
||
if (htab->sgot == NULL)
|
||
abort ();
|
||
|
||
if (h != NULL)
|
||
{
|
||
off = h->got.offset;
|
||
offplt = elf64_x86_64_hash_entry (h)->tlsdesc_got;
|
||
}
|
||
else
|
||
{
|
||
if (local_got_offsets == NULL)
|
||
abort ();
|
||
|
||
off = local_got_offsets[r_symndx];
|
||
offplt = local_tlsdesc_gotents[r_symndx];
|
||
}
|
||
|
||
if ((off & 1) != 0)
|
||
off &= ~1;
|
||
else
|
||
{
|
||
Elf_Internal_Rela outrel;
|
||
bfd_byte *loc;
|
||
int dr_type, indx;
|
||
asection *sreloc;
|
||
|
||
if (htab->srelgot == NULL)
|
||
abort ();
|
||
|
||
indx = h && h->dynindx != -1 ? h->dynindx : 0;
|
||
|
||
if (GOT_TLS_GDESC_P (tls_type))
|
||
{
|
||
outrel.r_info = ELF64_R_INFO (indx, R_X86_64_TLSDESC);
|
||
BFD_ASSERT (htab->sgotplt_jump_table_size + offplt
|
||
+ 2 * GOT_ENTRY_SIZE <= htab->sgotplt->size);
|
||
outrel.r_offset = (htab->sgotplt->output_section->vma
|
||
+ htab->sgotplt->output_offset
|
||
+ offplt
|
||
+ htab->sgotplt_jump_table_size);
|
||
sreloc = htab->srelplt;
|
||
loc = sreloc->contents;
|
||
loc += sreloc->reloc_count++
|
||
* sizeof (Elf64_External_Rela);
|
||
BFD_ASSERT (loc + sizeof (Elf64_External_Rela)
|
||
<= sreloc->contents + sreloc->size);
|
||
if (indx == 0)
|
||
outrel.r_addend = relocation - dtpoff_base (info);
|
||
else
|
||
outrel.r_addend = 0;
|
||
bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
|
||
}
|
||
|
||
sreloc = htab->srelgot;
|
||
|
||
outrel.r_offset = (htab->sgot->output_section->vma
|
||
+ htab->sgot->output_offset + off);
|
||
|
||
if (GOT_TLS_GD_P (tls_type))
|
||
dr_type = R_X86_64_DTPMOD64;
|
||
else if (GOT_TLS_GDESC_P (tls_type))
|
||
goto dr_done;
|
||
else
|
||
dr_type = R_X86_64_TPOFF64;
|
||
|
||
bfd_put_64 (output_bfd, 0, htab->sgot->contents + off);
|
||
outrel.r_addend = 0;
|
||
if ((dr_type == R_X86_64_TPOFF64
|
||
|| dr_type == R_X86_64_TLSDESC) && indx == 0)
|
||
outrel.r_addend = relocation - dtpoff_base (info);
|
||
outrel.r_info = ELF64_R_INFO (indx, dr_type);
|
||
|
||
loc = sreloc->contents;
|
||
loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
|
||
BFD_ASSERT (loc + sizeof (Elf64_External_Rela)
|
||
<= sreloc->contents + sreloc->size);
|
||
bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
|
||
|
||
if (GOT_TLS_GD_P (tls_type))
|
||
{
|
||
if (indx == 0)
|
||
{
|
||
BFD_ASSERT (! unresolved_reloc);
|
||
bfd_put_64 (output_bfd,
|
||
relocation - dtpoff_base (info),
|
||
htab->sgot->contents + off + GOT_ENTRY_SIZE);
|
||
}
|
||
else
|
||
{
|
||
bfd_put_64 (output_bfd, 0,
|
||
htab->sgot->contents + off + GOT_ENTRY_SIZE);
|
||
outrel.r_info = ELF64_R_INFO (indx,
|
||
R_X86_64_DTPOFF64);
|
||
outrel.r_offset += GOT_ENTRY_SIZE;
|
||
sreloc->reloc_count++;
|
||
loc += sizeof (Elf64_External_Rela);
|
||
BFD_ASSERT (loc + sizeof (Elf64_External_Rela)
|
||
<= sreloc->contents + sreloc->size);
|
||
bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
|
||
}
|
||
}
|
||
|
||
dr_done:
|
||
if (h != NULL)
|
||
h->got.offset |= 1;
|
||
else
|
||
local_got_offsets[r_symndx] |= 1;
|
||
}
|
||
|
||
if (off >= (bfd_vma) -2
|
||
&& ! GOT_TLS_GDESC_P (tls_type))
|
||
abort ();
|
||
if (r_type == ELF64_R_TYPE (rel->r_info))
|
||
{
|
||
if (r_type == R_X86_64_GOTPC32_TLSDESC
|
||
|| r_type == R_X86_64_TLSDESC_CALL)
|
||
relocation = htab->sgotplt->output_section->vma
|
||
+ htab->sgotplt->output_offset
|
||
+ offplt + htab->sgotplt_jump_table_size;
|
||
else
|
||
relocation = htab->sgot->output_section->vma
|
||
+ htab->sgot->output_offset + off;
|
||
unresolved_reloc = FALSE;
|
||
}
|
||
else
|
||
{
|
||
bfd_vma roff = rel->r_offset;
|
||
|
||
if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
|
||
{
|
||
/* GD->IE transition.
|
||
.byte 0x66; leaq foo@tlsgd(%rip), %rdi
|
||
.word 0x6666; rex64; call __tls_get_addr@plt
|
||
Change it into:
|
||
movq %fs:0, %rax
|
||
addq foo@gottpoff(%rip), %rax */
|
||
memcpy (contents + roff - 4,
|
||
"\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
|
||
16);
|
||
|
||
relocation = (htab->sgot->output_section->vma
|
||
+ htab->sgot->output_offset + off
|
||
- roff
|
||
- input_section->output_section->vma
|
||
- input_section->output_offset
|
||
- 12);
|
||
bfd_put_32 (output_bfd, relocation,
|
||
contents + roff + 8);
|
||
/* Skip R_X86_64_PLT32. */
|
||
rel++;
|
||
continue;
|
||
}
|
||
else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
|
||
{
|
||
/* GDesc -> IE transition.
|
||
It's originally something like:
|
||
leaq x@tlsdesc(%rip), %rax
|
||
|
||
Change it to:
|
||
movq x@gottpoff(%rip), %rax # before xchg %ax,%ax
|
||
*/
|
||
|
||
unsigned int val, type, type2;
|
||
|
||
type = bfd_get_8 (input_bfd, contents + roff - 3);
|
||
type2 = bfd_get_8 (input_bfd, contents + roff - 2);
|
||
val = bfd_get_8 (input_bfd, contents + roff - 1);
|
||
|
||
/* Now modify the instruction as appropriate. To
|
||
turn a leaq into a movq in the form we use it, it
|
||
suffices to change the second byte from 0x8d to
|
||
0x8b. */
|
||
bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
|
||
|
||
bfd_put_32 (output_bfd,
|
||
htab->sgot->output_section->vma
|
||
+ htab->sgot->output_offset + off
|
||
- rel->r_offset
|
||
- input_section->output_section->vma
|
||
- input_section->output_offset
|
||
- 4,
|
||
contents + roff);
|
||
continue;
|
||
}
|
||
else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
|
||
{
|
||
/* GDesc -> IE transition.
|
||
It's originally:
|
||
call *(%rax)
|
||
|
||
Change it to:
|
||
xchg %ax,%ax. */
|
||
|
||
unsigned int val, type;
|
||
|
||
type = bfd_get_8 (input_bfd, contents + roff);
|
||
val = bfd_get_8 (input_bfd, contents + roff + 1);
|
||
bfd_put_8 (output_bfd, 0x66, contents + roff);
|
||
bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
|
||
continue;
|
||
}
|
||
else
|
||
BFD_ASSERT (FALSE);
|
||
}
|
||
break;
|
||
|
||
case R_X86_64_TLSLD:
|
||
if (! elf64_x86_64_tls_transition (info, input_bfd,
|
||
input_section, contents,
|
||
symtab_hdr, sym_hashes,
|
||
&r_type, GOT_UNKNOWN,
|
||
rel, relend, h))
|
||
return FALSE;
|
||
|
||
if (r_type != R_X86_64_TLSLD)
|
||
{
|
||
/* LD->LE transition:
|
||
leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
|
||
We change it into:
|
||
.word 0x6666; .byte 0x66; movl %fs:0, %rax. */
|
||
|
||
BFD_ASSERT (r_type == R_X86_64_TPOFF32);
|
||
memcpy (contents + rel->r_offset - 3,
|
||
"\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
|
||
/* Skip R_X86_64_PC32/R_X86_64_PLT32. */
|
||
rel++;
|
||
continue;
|
||
}
|
||
|
||
if (htab->sgot == NULL)
|
||
abort ();
|
||
|
||
off = htab->tls_ld_got.offset;
|
||
if (off & 1)
|
||
off &= ~1;
|
||
else
|
||
{
|
||
Elf_Internal_Rela outrel;
|
||
bfd_byte *loc;
|
||
|
||
if (htab->srelgot == NULL)
|
||
abort ();
|
||
|
||
outrel.r_offset = (htab->sgot->output_section->vma
|
||
+ htab->sgot->output_offset + off);
|
||
|
||
bfd_put_64 (output_bfd, 0,
|
||
htab->sgot->contents + off);
|
||
bfd_put_64 (output_bfd, 0,
|
||
htab->sgot->contents + off + GOT_ENTRY_SIZE);
|
||
outrel.r_info = ELF64_R_INFO (0, R_X86_64_DTPMOD64);
|
||
outrel.r_addend = 0;
|
||
loc = htab->srelgot->contents;
|
||
loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
|
||
bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
|
||
htab->tls_ld_got.offset |= 1;
|
||
}
|
||
relocation = htab->sgot->output_section->vma
|
||
+ htab->sgot->output_offset + off;
|
||
unresolved_reloc = FALSE;
|
||
break;
|
||
|
||
case R_X86_64_DTPOFF32:
|
||
if (info->shared || (input_section->flags & SEC_CODE) == 0)
|
||
relocation -= dtpoff_base (info);
|
||
else
|
||
relocation = tpoff (info, relocation);
|
||
break;
|
||
|
||
case R_X86_64_TPOFF32:
|
||
BFD_ASSERT (! info->shared);
|
||
relocation = tpoff (info, relocation);
|
||
break;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
|
||
/* Dynamic relocs are not propagated for SEC_DEBUGGING sections
|
||
because such sections are not SEC_ALLOC and thus ld.so will
|
||
not process them. */
|
||
if (unresolved_reloc
|
||
&& !((input_section->flags & SEC_DEBUGGING) != 0
|
||
&& h->def_dynamic))
|
||
(*_bfd_error_handler)
|
||
(_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
|
||
input_bfd,
|
||
input_section,
|
||
(long) rel->r_offset,
|
||
howto->name,
|
||
h->root.root.string);
|
||
|
||
r = _bfd_final_link_relocate (howto, input_bfd, input_section,
|
||
contents, rel->r_offset,
|
||
relocation, rel->r_addend);
|
||
|
||
if (r != bfd_reloc_ok)
|
||
{
|
||
const char *name;
|
||
|
||
if (h != NULL)
|
||
name = h->root.root.string;
|
||
else
|
||
{
|
||
name = bfd_elf_string_from_elf_section (input_bfd,
|
||
symtab_hdr->sh_link,
|
||
sym->st_name);
|
||
if (name == NULL)
|
||
return FALSE;
|
||
if (*name == '\0')
|
||
name = bfd_section_name (input_bfd, sec);
|
||
}
|
||
|
||
if (r == bfd_reloc_overflow)
|
||
{
|
||
if (! ((*info->callbacks->reloc_overflow)
|
||
(info, (h ? &h->root : NULL), name, howto->name,
|
||
(bfd_vma) 0, input_bfd, input_section,
|
||
rel->r_offset)))
|
||
return FALSE;
|
||
}
|
||
else
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%B(%A+0x%lx): reloc against `%s': error %d"),
|
||
input_bfd, input_section,
|
||
(long) rel->r_offset, name, (int) r);
|
||
return FALSE;
|
||
}
|
||
}
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Finish up dynamic symbol handling. We set the contents of various
|
||
dynamic sections here. */
|
||
|
||
static bfd_boolean
|
||
elf64_x86_64_finish_dynamic_symbol (bfd *output_bfd,
|
||
struct bfd_link_info *info,
|
||
struct elf_link_hash_entry *h,
|
||
Elf_Internal_Sym *sym)
|
||
{
|
||
struct elf64_x86_64_link_hash_table *htab;
|
||
|
||
htab = elf64_x86_64_hash_table (info);
|
||
|
||
if (h->plt.offset != (bfd_vma) -1)
|
||
{
|
||
bfd_vma plt_index;
|
||
bfd_vma got_offset;
|
||
Elf_Internal_Rela rela;
|
||
bfd_byte *loc;
|
||
|
||
/* This symbol has an entry in the procedure linkage table. Set
|
||
it up. */
|
||
if (h->dynindx == -1
|
||
|| htab->splt == NULL
|
||
|| htab->sgotplt == NULL
|
||
|| htab->srelplt == NULL)
|
||
abort ();
|
||
|
||
/* Get the index in the procedure linkage table which
|
||
corresponds to this symbol. This is the index of this symbol
|
||
in all the symbols for which we are making plt entries. The
|
||
first entry in the procedure linkage table is reserved. */
|
||
plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
|
||
|
||
/* Get the offset into the .got table of the entry that
|
||
corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
|
||
bytes. The first three are reserved for the dynamic linker. */
|
||
got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
|
||
|
||
/* Fill in the entry in the procedure linkage table. */
|
||
memcpy (htab->splt->contents + h->plt.offset, elf64_x86_64_plt_entry,
|
||
PLT_ENTRY_SIZE);
|
||
|
||
/* Insert the relocation positions of the plt section. The magic
|
||
numbers at the end of the statements are the positions of the
|
||
relocations in the plt section. */
|
||
/* Put offset for jmp *name@GOTPCREL(%rip), since the
|
||
instruction uses 6 bytes, subtract this value. */
|
||
bfd_put_32 (output_bfd,
|
||
(htab->sgotplt->output_section->vma
|
||
+ htab->sgotplt->output_offset
|
||
+ got_offset
|
||
- htab->splt->output_section->vma
|
||
- htab->splt->output_offset
|
||
- h->plt.offset
|
||
- 6),
|
||
htab->splt->contents + h->plt.offset + 2);
|
||
/* Put relocation index. */
|
||
bfd_put_32 (output_bfd, plt_index,
|
||
htab->splt->contents + h->plt.offset + 7);
|
||
/* Put offset for jmp .PLT0. */
|
||
bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
|
||
htab->splt->contents + h->plt.offset + 12);
|
||
|
||
/* Fill in the entry in the global offset table, initially this
|
||
points to the pushq instruction in the PLT which is at offset 6. */
|
||
bfd_put_64 (output_bfd, (htab->splt->output_section->vma
|
||
+ htab->splt->output_offset
|
||
+ h->plt.offset + 6),
|
||
htab->sgotplt->contents + got_offset);
|
||
|
||
/* Fill in the entry in the .rela.plt section. */
|
||
rela.r_offset = (htab->sgotplt->output_section->vma
|
||
+ htab->sgotplt->output_offset
|
||
+ got_offset);
|
||
rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_JUMP_SLOT);
|
||
rela.r_addend = 0;
|
||
loc = htab->srelplt->contents + plt_index * sizeof (Elf64_External_Rela);
|
||
bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
|
||
|
||
if (!h->def_regular)
|
||
{
|
||
/* Mark the symbol as undefined, rather than as defined in
|
||
the .plt section. Leave the value if there were any
|
||
relocations where pointer equality matters (this is a clue
|
||
for the dynamic linker, to make function pointer
|
||
comparisons work between an application and shared
|
||
library), otherwise set it to zero. If a function is only
|
||
called from a binary, there is no need to slow down
|
||
shared libraries because of that. */
|
||
sym->st_shndx = SHN_UNDEF;
|
||
if (!h->pointer_equality_needed)
|
||
sym->st_value = 0;
|
||
}
|
||
}
|
||
|
||
if (h->got.offset != (bfd_vma) -1
|
||
&& ! GOT_TLS_GD_ANY_P (elf64_x86_64_hash_entry (h)->tls_type)
|
||
&& elf64_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE)
|
||
{
|
||
Elf_Internal_Rela rela;
|
||
bfd_byte *loc;
|
||
|
||
/* This symbol has an entry in the global offset table. Set it
|
||
up. */
|
||
if (htab->sgot == NULL || htab->srelgot == NULL)
|
||
abort ();
|
||
|
||
rela.r_offset = (htab->sgot->output_section->vma
|
||
+ htab->sgot->output_offset
|
||
+ (h->got.offset &~ (bfd_vma) 1));
|
||
|
||
/* If this is a static link, or it is a -Bsymbolic link and the
|
||
symbol is defined locally or was forced to be local because
|
||
of a version file, we just want to emit a RELATIVE reloc.
|
||
The entry in the global offset table will already have been
|
||
initialized in the relocate_section function. */
|
||
if (info->shared
|
||
&& SYMBOL_REFERENCES_LOCAL (info, h))
|
||
{
|
||
BFD_ASSERT((h->got.offset & 1) != 0);
|
||
rela.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
|
||
rela.r_addend = (h->root.u.def.value
|
||
+ h->root.u.def.section->output_section->vma
|
||
+ h->root.u.def.section->output_offset);
|
||
}
|
||
else
|
||
{
|
||
BFD_ASSERT((h->got.offset & 1) == 0);
|
||
bfd_put_64 (output_bfd, (bfd_vma) 0,
|
||
htab->sgot->contents + h->got.offset);
|
||
rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_GLOB_DAT);
|
||
rela.r_addend = 0;
|
||
}
|
||
|
||
loc = htab->srelgot->contents;
|
||
loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
|
||
bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
|
||
}
|
||
|
||
if (h->needs_copy)
|
||
{
|
||
Elf_Internal_Rela rela;
|
||
bfd_byte *loc;
|
||
|
||
/* This symbol needs a copy reloc. Set it up. */
|
||
|
||
if (h->dynindx == -1
|
||
|| (h->root.type != bfd_link_hash_defined
|
||
&& h->root.type != bfd_link_hash_defweak)
|
||
|| htab->srelbss == NULL)
|
||
abort ();
|
||
|
||
rela.r_offset = (h->root.u.def.value
|
||
+ h->root.u.def.section->output_section->vma
|
||
+ h->root.u.def.section->output_offset);
|
||
rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_COPY);
|
||
rela.r_addend = 0;
|
||
loc = htab->srelbss->contents;
|
||
loc += htab->srelbss->reloc_count++ * sizeof (Elf64_External_Rela);
|
||
bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
|
||
}
|
||
|
||
/* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
|
||
if (strcmp (h->root.root.string, "_DYNAMIC") == 0
|
||
|| h == htab->elf.hgot)
|
||
sym->st_shndx = SHN_ABS;
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Used to decide how to sort relocs in an optimal manner for the
|
||
dynamic linker, before writing them out. */
|
||
|
||
static enum elf_reloc_type_class
|
||
elf64_x86_64_reloc_type_class (const Elf_Internal_Rela *rela)
|
||
{
|
||
switch ((int) ELF64_R_TYPE (rela->r_info))
|
||
{
|
||
case R_X86_64_RELATIVE:
|
||
return reloc_class_relative;
|
||
case R_X86_64_JUMP_SLOT:
|
||
return reloc_class_plt;
|
||
case R_X86_64_COPY:
|
||
return reloc_class_copy;
|
||
default:
|
||
return reloc_class_normal;
|
||
}
|
||
}
|
||
|
||
/* Finish up the dynamic sections. */
|
||
|
||
static bfd_boolean
|
||
elf64_x86_64_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
|
||
{
|
||
struct elf64_x86_64_link_hash_table *htab;
|
||
bfd *dynobj;
|
||
asection *sdyn;
|
||
|
||
htab = elf64_x86_64_hash_table (info);
|
||
dynobj = htab->elf.dynobj;
|
||
sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
|
||
|
||
if (htab->elf.dynamic_sections_created)
|
||
{
|
||
Elf64_External_Dyn *dyncon, *dynconend;
|
||
|
||
if (sdyn == NULL || htab->sgot == NULL)
|
||
abort ();
|
||
|
||
dyncon = (Elf64_External_Dyn *) sdyn->contents;
|
||
dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size);
|
||
for (; dyncon < dynconend; dyncon++)
|
||
{
|
||
Elf_Internal_Dyn dyn;
|
||
asection *s;
|
||
|
||
bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
|
||
|
||
switch (dyn.d_tag)
|
||
{
|
||
default:
|
||
continue;
|
||
|
||
case DT_PLTGOT:
|
||
s = htab->sgotplt;
|
||
dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
|
||
break;
|
||
|
||
case DT_JMPREL:
|
||
dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
|
||
break;
|
||
|
||
case DT_PLTRELSZ:
|
||
s = htab->srelplt->output_section;
|
||
dyn.d_un.d_val = s->size;
|
||
break;
|
||
|
||
case DT_RELASZ:
|
||
/* The procedure linkage table relocs (DT_JMPREL) should
|
||
not be included in the overall relocs (DT_RELA).
|
||
Therefore, we override the DT_RELASZ entry here to
|
||
make it not include the JMPREL relocs. Since the
|
||
linker script arranges for .rela.plt to follow all
|
||
other relocation sections, we don't have to worry
|
||
about changing the DT_RELA entry. */
|
||
if (htab->srelplt != NULL)
|
||
{
|
||
s = htab->srelplt->output_section;
|
||
dyn.d_un.d_val -= s->size;
|
||
}
|
||
break;
|
||
|
||
case DT_TLSDESC_PLT:
|
||
s = htab->splt;
|
||
dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
|
||
+ htab->tlsdesc_plt;
|
||
break;
|
||
|
||
case DT_TLSDESC_GOT:
|
||
s = htab->sgot;
|
||
dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
|
||
+ htab->tlsdesc_got;
|
||
break;
|
||
}
|
||
|
||
bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
|
||
}
|
||
|
||
/* Fill in the special first entry in the procedure linkage table. */
|
||
if (htab->splt && htab->splt->size > 0)
|
||
{
|
||
/* Fill in the first entry in the procedure linkage table. */
|
||
memcpy (htab->splt->contents, elf64_x86_64_plt0_entry,
|
||
PLT_ENTRY_SIZE);
|
||
/* Add offset for pushq GOT+8(%rip), since the instruction
|
||
uses 6 bytes subtract this value. */
|
||
bfd_put_32 (output_bfd,
|
||
(htab->sgotplt->output_section->vma
|
||
+ htab->sgotplt->output_offset
|
||
+ 8
|
||
- htab->splt->output_section->vma
|
||
- htab->splt->output_offset
|
||
- 6),
|
||
htab->splt->contents + 2);
|
||
/* Add offset for jmp *GOT+16(%rip). The 12 is the offset to
|
||
the end of the instruction. */
|
||
bfd_put_32 (output_bfd,
|
||
(htab->sgotplt->output_section->vma
|
||
+ htab->sgotplt->output_offset
|
||
+ 16
|
||
- htab->splt->output_section->vma
|
||
- htab->splt->output_offset
|
||
- 12),
|
||
htab->splt->contents + 8);
|
||
|
||
elf_section_data (htab->splt->output_section)->this_hdr.sh_entsize =
|
||
PLT_ENTRY_SIZE;
|
||
|
||
if (htab->tlsdesc_plt)
|
||
{
|
||
bfd_put_64 (output_bfd, (bfd_vma) 0,
|
||
htab->sgot->contents + htab->tlsdesc_got);
|
||
|
||
memcpy (htab->splt->contents + htab->tlsdesc_plt,
|
||
elf64_x86_64_plt0_entry,
|
||
PLT_ENTRY_SIZE);
|
||
|
||
/* Add offset for pushq GOT+8(%rip), since the
|
||
instruction uses 6 bytes subtract this value. */
|
||
bfd_put_32 (output_bfd,
|
||
(htab->sgotplt->output_section->vma
|
||
+ htab->sgotplt->output_offset
|
||
+ 8
|
||
- htab->splt->output_section->vma
|
||
- htab->splt->output_offset
|
||
- htab->tlsdesc_plt
|
||
- 6),
|
||
htab->splt->contents + htab->tlsdesc_plt + 2);
|
||
/* Add offset for jmp *GOT+TDG(%rip), where TGD stands for
|
||
htab->tlsdesc_got. The 12 is the offset to the end of
|
||
the instruction. */
|
||
bfd_put_32 (output_bfd,
|
||
(htab->sgot->output_section->vma
|
||
+ htab->sgot->output_offset
|
||
+ htab->tlsdesc_got
|
||
- htab->splt->output_section->vma
|
||
- htab->splt->output_offset
|
||
- htab->tlsdesc_plt
|
||
- 12),
|
||
htab->splt->contents + htab->tlsdesc_plt + 8);
|
||
}
|
||
}
|
||
}
|
||
|
||
if (htab->sgotplt)
|
||
{
|
||
/* Fill in the first three entries in the global offset table. */
|
||
if (htab->sgotplt->size > 0)
|
||
{
|
||
/* Set the first entry in the global offset table to the address of
|
||
the dynamic section. */
|
||
if (sdyn == NULL)
|
||
bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents);
|
||
else
|
||
bfd_put_64 (output_bfd,
|
||
sdyn->output_section->vma + sdyn->output_offset,
|
||
htab->sgotplt->contents);
|
||
/* Write GOT[1] and GOT[2], needed for the dynamic linker. */
|
||
bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + GOT_ENTRY_SIZE);
|
||
bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + GOT_ENTRY_SIZE*2);
|
||
}
|
||
|
||
elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize =
|
||
GOT_ENTRY_SIZE;
|
||
}
|
||
|
||
if (htab->sgot && htab->sgot->size > 0)
|
||
elf_section_data (htab->sgot->output_section)->this_hdr.sh_entsize
|
||
= GOT_ENTRY_SIZE;
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Return address for Ith PLT stub in section PLT, for relocation REL
|
||
or (bfd_vma) -1 if it should not be included. */
|
||
|
||
static bfd_vma
|
||
elf64_x86_64_plt_sym_val (bfd_vma i, const asection *plt,
|
||
const arelent *rel ATTRIBUTE_UNUSED)
|
||
{
|
||
return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
|
||
}
|
||
|
||
/* Handle an x86-64 specific section when reading an object file. This
|
||
is called when elfcode.h finds a section with an unknown type. */
|
||
|
||
static bfd_boolean
|
||
elf64_x86_64_section_from_shdr (bfd *abfd,
|
||
Elf_Internal_Shdr *hdr,
|
||
const char *name,
|
||
int shindex)
|
||
{
|
||
if (hdr->sh_type != SHT_X86_64_UNWIND)
|
||
return FALSE;
|
||
|
||
if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
|
||
return FALSE;
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Hook called by the linker routine which adds symbols from an object
|
||
file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
|
||
of .bss. */
|
||
|
||
static bfd_boolean
|
||
elf64_x86_64_add_symbol_hook (bfd *abfd,
|
||
struct bfd_link_info *info ATTRIBUTE_UNUSED,
|
||
Elf_Internal_Sym *sym,
|
||
const char **namep ATTRIBUTE_UNUSED,
|
||
flagword *flagsp ATTRIBUTE_UNUSED,
|
||
asection **secp, bfd_vma *valp)
|
||
{
|
||
asection *lcomm;
|
||
|
||
switch (sym->st_shndx)
|
||
{
|
||
case SHN_X86_64_LCOMMON:
|
||
lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON");
|
||
if (lcomm == NULL)
|
||
{
|
||
lcomm = bfd_make_section_with_flags (abfd,
|
||
"LARGE_COMMON",
|
||
(SEC_ALLOC
|
||
| SEC_IS_COMMON
|
||
| SEC_LINKER_CREATED));
|
||
if (lcomm == NULL)
|
||
return FALSE;
|
||
elf_section_flags (lcomm) |= SHF_X86_64_LARGE;
|
||
}
|
||
*secp = lcomm;
|
||
*valp = sym->st_size;
|
||
break;
|
||
}
|
||
return TRUE;
|
||
}
|
||
|
||
|
||
/* Given a BFD section, try to locate the corresponding ELF section
|
||
index. */
|
||
|
||
static bfd_boolean
|
||
elf64_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED,
|
||
asection *sec, int *index)
|
||
{
|
||
if (sec == &_bfd_elf_large_com_section)
|
||
{
|
||
*index = SHN_X86_64_LCOMMON;
|
||
return TRUE;
|
||
}
|
||
return FALSE;
|
||
}
|
||
|
||
/* Process a symbol. */
|
||
|
||
static void
|
||
elf64_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
|
||
asymbol *asym)
|
||
{
|
||
elf_symbol_type *elfsym = (elf_symbol_type *) asym;
|
||
|
||
switch (elfsym->internal_elf_sym.st_shndx)
|
||
{
|
||
case SHN_X86_64_LCOMMON:
|
||
asym->section = &_bfd_elf_large_com_section;
|
||
asym->value = elfsym->internal_elf_sym.st_size;
|
||
/* Common symbol doesn't set BSF_GLOBAL. */
|
||
asym->flags &= ~BSF_GLOBAL;
|
||
break;
|
||
}
|
||
}
|
||
|
||
static bfd_boolean
|
||
elf64_x86_64_common_definition (Elf_Internal_Sym *sym)
|
||
{
|
||
return (sym->st_shndx == SHN_COMMON
|
||
|| sym->st_shndx == SHN_X86_64_LCOMMON);
|
||
}
|
||
|
||
static unsigned int
|
||
elf64_x86_64_common_section_index (asection *sec)
|
||
{
|
||
if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
|
||
return SHN_COMMON;
|
||
else
|
||
return SHN_X86_64_LCOMMON;
|
||
}
|
||
|
||
static asection *
|
||
elf64_x86_64_common_section (asection *sec)
|
||
{
|
||
if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
|
||
return bfd_com_section_ptr;
|
||
else
|
||
return &_bfd_elf_large_com_section;
|
||
}
|
||
|
||
static bfd_boolean
|
||
elf64_x86_64_merge_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
|
||
struct elf_link_hash_entry **sym_hash ATTRIBUTE_UNUSED,
|
||
struct elf_link_hash_entry *h,
|
||
Elf_Internal_Sym *sym,
|
||
asection **psec,
|
||
bfd_vma *pvalue ATTRIBUTE_UNUSED,
|
||
unsigned int *pold_alignment ATTRIBUTE_UNUSED,
|
||
bfd_boolean *skip ATTRIBUTE_UNUSED,
|
||
bfd_boolean *override ATTRIBUTE_UNUSED,
|
||
bfd_boolean *type_change_ok ATTRIBUTE_UNUSED,
|
||
bfd_boolean *size_change_ok ATTRIBUTE_UNUSED,
|
||
bfd_boolean *newdef ATTRIBUTE_UNUSED,
|
||
bfd_boolean *newdyn,
|
||
bfd_boolean *newdyncommon ATTRIBUTE_UNUSED,
|
||
bfd_boolean *newweak ATTRIBUTE_UNUSED,
|
||
bfd *abfd ATTRIBUTE_UNUSED,
|
||
asection **sec,
|
||
bfd_boolean *olddef ATTRIBUTE_UNUSED,
|
||
bfd_boolean *olddyn,
|
||
bfd_boolean *olddyncommon ATTRIBUTE_UNUSED,
|
||
bfd_boolean *oldweak ATTRIBUTE_UNUSED,
|
||
bfd *oldbfd,
|
||
asection **oldsec)
|
||
{
|
||
/* A normal common symbol and a large common symbol result in a
|
||
normal common symbol. We turn the large common symbol into a
|
||
normal one. */
|
||
if (!*olddyn
|
||
&& h->root.type == bfd_link_hash_common
|
||
&& !*newdyn
|
||
&& bfd_is_com_section (*sec)
|
||
&& *oldsec != *sec)
|
||
{
|
||
if (sym->st_shndx == SHN_COMMON
|
||
&& (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) != 0)
|
||
{
|
||
h->root.u.c.p->section
|
||
= bfd_make_section_old_way (oldbfd, "COMMON");
|
||
h->root.u.c.p->section->flags = SEC_ALLOC;
|
||
}
|
||
else if (sym->st_shndx == SHN_X86_64_LCOMMON
|
||
&& (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) == 0)
|
||
*psec = *sec = bfd_com_section_ptr;
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
static int
|
||
elf64_x86_64_additional_program_headers (bfd *abfd,
|
||
struct bfd_link_info *info ATTRIBUTE_UNUSED)
|
||
{
|
||
asection *s;
|
||
int count = 0;
|
||
|
||
/* Check to see if we need a large readonly segment. */
|
||
s = bfd_get_section_by_name (abfd, ".lrodata");
|
||
if (s && (s->flags & SEC_LOAD))
|
||
count++;
|
||
|
||
/* Check to see if we need a large data segment. Since .lbss sections
|
||
is placed right after the .bss section, there should be no need for
|
||
a large data segment just because of .lbss. */
|
||
s = bfd_get_section_by_name (abfd, ".ldata");
|
||
if (s && (s->flags & SEC_LOAD))
|
||
count++;
|
||
|
||
return count;
|
||
}
|
||
|
||
/* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
|
||
|
||
static bfd_boolean
|
||
elf64_x86_64_hash_symbol (struct elf_link_hash_entry *h)
|
||
{
|
||
if (h->plt.offset != (bfd_vma) -1
|
||
&& !h->def_regular
|
||
&& !h->pointer_equality_needed)
|
||
return FALSE;
|
||
|
||
return _bfd_elf_hash_symbol (h);
|
||
}
|
||
|
||
static const struct bfd_elf_special_section
|
||
elf64_x86_64_special_sections[]=
|
||
{
|
||
{ STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
|
||
{ STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
|
||
{ STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
|
||
{ STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
|
||
{ STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
|
||
{ STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
|
||
{ NULL, 0, 0, 0, 0 }
|
||
};
|
||
|
||
#define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
|
||
#define TARGET_LITTLE_NAME "elf64-x86-64"
|
||
#define ELF_ARCH bfd_arch_i386
|
||
#define ELF_MACHINE_CODE EM_X86_64
|
||
#define ELF_MAXPAGESIZE 0x200000
|
||
#define ELF_MINPAGESIZE 0x1000
|
||
#define ELF_COMMONPAGESIZE 0x1000
|
||
|
||
#define elf_backend_can_gc_sections 1
|
||
#define elf_backend_can_refcount 1
|
||
#define elf_backend_want_got_plt 1
|
||
#define elf_backend_plt_readonly 1
|
||
#define elf_backend_want_plt_sym 0
|
||
#define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
|
||
#define elf_backend_rela_normal 1
|
||
|
||
#define elf_info_to_howto elf64_x86_64_info_to_howto
|
||
|
||
#define bfd_elf64_bfd_link_hash_table_create \
|
||
elf64_x86_64_link_hash_table_create
|
||
#define bfd_elf64_bfd_reloc_type_lookup elf64_x86_64_reloc_type_lookup
|
||
#define bfd_elf64_bfd_reloc_name_lookup \
|
||
elf64_x86_64_reloc_name_lookup
|
||
|
||
#define elf_backend_adjust_dynamic_symbol elf64_x86_64_adjust_dynamic_symbol
|
||
#define elf_backend_check_relocs elf64_x86_64_check_relocs
|
||
#define elf_backend_copy_indirect_symbol elf64_x86_64_copy_indirect_symbol
|
||
#define elf_backend_create_dynamic_sections elf64_x86_64_create_dynamic_sections
|
||
#define elf_backend_finish_dynamic_sections elf64_x86_64_finish_dynamic_sections
|
||
#define elf_backend_finish_dynamic_symbol elf64_x86_64_finish_dynamic_symbol
|
||
#define elf_backend_gc_mark_hook elf64_x86_64_gc_mark_hook
|
||
#define elf_backend_gc_sweep_hook elf64_x86_64_gc_sweep_hook
|
||
#define elf_backend_grok_prstatus elf64_x86_64_grok_prstatus
|
||
#define elf_backend_grok_psinfo elf64_x86_64_grok_psinfo
|
||
#define elf_backend_reloc_type_class elf64_x86_64_reloc_type_class
|
||
#define elf_backend_relocate_section elf64_x86_64_relocate_section
|
||
#define elf_backend_size_dynamic_sections elf64_x86_64_size_dynamic_sections
|
||
#define elf_backend_always_size_sections elf64_x86_64_always_size_sections
|
||
#define elf_backend_init_index_section _bfd_elf_init_1_index_section
|
||
#define elf_backend_plt_sym_val elf64_x86_64_plt_sym_val
|
||
#define elf_backend_object_p elf64_x86_64_elf_object_p
|
||
#define bfd_elf64_mkobject elf64_x86_64_mkobject
|
||
|
||
#define elf_backend_section_from_shdr \
|
||
elf64_x86_64_section_from_shdr
|
||
|
||
#define elf_backend_section_from_bfd_section \
|
||
elf64_x86_64_elf_section_from_bfd_section
|
||
#define elf_backend_add_symbol_hook \
|
||
elf64_x86_64_add_symbol_hook
|
||
#define elf_backend_symbol_processing \
|
||
elf64_x86_64_symbol_processing
|
||
#define elf_backend_common_section_index \
|
||
elf64_x86_64_common_section_index
|
||
#define elf_backend_common_section \
|
||
elf64_x86_64_common_section
|
||
#define elf_backend_common_definition \
|
||
elf64_x86_64_common_definition
|
||
#define elf_backend_merge_symbol \
|
||
elf64_x86_64_merge_symbol
|
||
#define elf_backend_special_sections \
|
||
elf64_x86_64_special_sections
|
||
#define elf_backend_additional_program_headers \
|
||
elf64_x86_64_additional_program_headers
|
||
#define elf_backend_hash_symbol \
|
||
elf64_x86_64_hash_symbol
|
||
|
||
#include "elf64-target.h"
|
||
|
||
/* FreeBSD support. */
|
||
|
||
#undef TARGET_LITTLE_SYM
|
||
#define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec
|
||
#undef TARGET_LITTLE_NAME
|
||
#define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
|
||
|
||
#undef ELF_OSABI
|
||
#define ELF_OSABI ELFOSABI_FREEBSD
|
||
|
||
#undef elf_backend_post_process_headers
|
||
#define elf_backend_post_process_headers _bfd_elf_set_osabi
|
||
|
||
#undef elf64_bed
|
||
#define elf64_bed elf64_x86_64_fbsd_bed
|
||
|
||
#include "elf64-target.h"
|