forked from KolibriOS/kolibrios
6140 lines
178 KiB
C
6140 lines
178 KiB
C
/* Intel 80386/80486-specific support for 32-bit ELF
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Copyright (C) 1993-2015 Free Software Foundation, Inc.
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "sysdep.h"
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#include "bfd.h"
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#include "bfdlink.h"
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#include "libbfd.h"
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#include "elf-bfd.h"
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#include "elf-nacl.h"
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#include "elf-vxworks.h"
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#include "bfd_stdint.h"
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#include "objalloc.h"
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#include "hashtab.h"
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#include "dwarf2.h"
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#include "opcode/i386.h"
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/* 386 uses REL relocations instead of RELA. */
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#define USE_REL 1
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#include "elf/i386.h"
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static reloc_howto_type elf_howto_table[]=
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{
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HOWTO(R_386_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont,
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bfd_elf_generic_reloc, "R_386_NONE",
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TRUE, 0x00000000, 0x00000000, FALSE),
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HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_386_32",
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TRUE, 0xffffffff, 0xffffffff, FALSE),
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HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_386_PC32",
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TRUE, 0xffffffff, 0xffffffff, TRUE),
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HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_386_GOT32",
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TRUE, 0xffffffff, 0xffffffff, FALSE),
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HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_386_PLT32",
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TRUE, 0xffffffff, 0xffffffff, TRUE),
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HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_386_COPY",
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TRUE, 0xffffffff, 0xffffffff, FALSE),
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HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_386_GLOB_DAT",
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TRUE, 0xffffffff, 0xffffffff, FALSE),
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HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
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TRUE, 0xffffffff, 0xffffffff, FALSE),
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HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_386_RELATIVE",
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TRUE, 0xffffffff, 0xffffffff, FALSE),
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HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_386_GOTOFF",
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TRUE, 0xffffffff, 0xffffffff, FALSE),
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HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_386_GOTPC",
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TRUE, 0xffffffff, 0xffffffff, TRUE),
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/* We have a gap in the reloc numbers here.
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R_386_standard counts the number up to this point, and
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R_386_ext_offset is the value to subtract from a reloc type of
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R_386_16 thru R_386_PC8 to form an index into this table. */
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#define R_386_standard (R_386_GOTPC + 1)
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#define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
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/* These relocs are a GNU extension. */
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HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
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TRUE, 0xffffffff, 0xffffffff, FALSE),
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HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_386_TLS_IE",
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TRUE, 0xffffffff, 0xffffffff, FALSE),
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HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
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TRUE, 0xffffffff, 0xffffffff, FALSE),
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HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_386_TLS_LE",
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TRUE, 0xffffffff, 0xffffffff, FALSE),
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HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_386_TLS_GD",
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TRUE, 0xffffffff, 0xffffffff, FALSE),
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HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_386_TLS_LDM",
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TRUE, 0xffffffff, 0xffffffff, FALSE),
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HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_386_16",
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TRUE, 0xffff, 0xffff, FALSE),
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HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_386_PC16",
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TRUE, 0xffff, 0xffff, TRUE),
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HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_386_8",
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TRUE, 0xff, 0xff, FALSE),
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HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
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bfd_elf_generic_reloc, "R_386_PC8",
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TRUE, 0xff, 0xff, TRUE),
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#define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
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#define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
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/* These are common with Solaris TLS implementation. */
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HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
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TRUE, 0xffffffff, 0xffffffff, FALSE),
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HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_386_TLS_IE_32",
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TRUE, 0xffffffff, 0xffffffff, FALSE),
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HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_386_TLS_LE_32",
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TRUE, 0xffffffff, 0xffffffff, FALSE),
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HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
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TRUE, 0xffffffff, 0xffffffff, FALSE),
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HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
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TRUE, 0xffffffff, 0xffffffff, FALSE),
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HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
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TRUE, 0xffffffff, 0xffffffff, FALSE),
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HOWTO(R_386_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
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bfd_elf_generic_reloc, "R_386_SIZE32",
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TRUE, 0xffffffff, 0xffffffff, FALSE),
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HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
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TRUE, 0xffffffff, 0xffffffff, FALSE),
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HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
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bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
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FALSE, 0, 0, FALSE),
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HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_386_TLS_DESC",
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TRUE, 0xffffffff, 0xffffffff, FALSE),
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HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_386_IRELATIVE",
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TRUE, 0xffffffff, 0xffffffff, FALSE),
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HOWTO(R_386_GOT32X, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
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bfd_elf_generic_reloc, "R_386_GOT32X",
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TRUE, 0xffffffff, 0xffffffff, FALSE),
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/* Another gap. */
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#define R_386_ext2 (R_386_GOT32X + 1 - R_386_tls_offset)
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#define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_ext2)
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/* GNU extension to record C++ vtable hierarchy. */
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HOWTO (R_386_GNU_VTINHERIT, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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0, /* bitsize */
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FALSE, /* pc_relative */
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0, /* bitpos */
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complain_overflow_dont, /* complain_on_overflow */
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NULL, /* special_function */
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"R_386_GNU_VTINHERIT", /* name */
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FALSE, /* partial_inplace */
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0, /* src_mask */
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0, /* dst_mask */
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FALSE), /* pcrel_offset */
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/* GNU extension to record C++ vtable member usage. */
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HOWTO (R_386_GNU_VTENTRY, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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0, /* bitsize */
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FALSE, /* pc_relative */
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0, /* bitpos */
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complain_overflow_dont, /* complain_on_overflow */
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_bfd_elf_rel_vtable_reloc_fn, /* special_function */
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"R_386_GNU_VTENTRY", /* name */
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FALSE, /* partial_inplace */
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0, /* src_mask */
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0, /* dst_mask */
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FALSE) /* pcrel_offset */
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#define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
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};
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#ifdef DEBUG_GEN_RELOC
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#define TRACE(str) \
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fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
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#else
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#define TRACE(str)
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#endif
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static reloc_howto_type *
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elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
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bfd_reloc_code_real_type code)
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{
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switch (code)
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{
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case BFD_RELOC_NONE:
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TRACE ("BFD_RELOC_NONE");
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return &elf_howto_table[R_386_NONE];
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case BFD_RELOC_32:
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TRACE ("BFD_RELOC_32");
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return &elf_howto_table[R_386_32];
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case BFD_RELOC_CTOR:
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TRACE ("BFD_RELOC_CTOR");
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return &elf_howto_table[R_386_32];
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case BFD_RELOC_32_PCREL:
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TRACE ("BFD_RELOC_PC32");
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return &elf_howto_table[R_386_PC32];
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case BFD_RELOC_386_GOT32:
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TRACE ("BFD_RELOC_386_GOT32");
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return &elf_howto_table[R_386_GOT32];
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case BFD_RELOC_386_PLT32:
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TRACE ("BFD_RELOC_386_PLT32");
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return &elf_howto_table[R_386_PLT32];
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case BFD_RELOC_386_COPY:
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TRACE ("BFD_RELOC_386_COPY");
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return &elf_howto_table[R_386_COPY];
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case BFD_RELOC_386_GLOB_DAT:
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TRACE ("BFD_RELOC_386_GLOB_DAT");
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return &elf_howto_table[R_386_GLOB_DAT];
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case BFD_RELOC_386_JUMP_SLOT:
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TRACE ("BFD_RELOC_386_JUMP_SLOT");
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return &elf_howto_table[R_386_JUMP_SLOT];
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case BFD_RELOC_386_RELATIVE:
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TRACE ("BFD_RELOC_386_RELATIVE");
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return &elf_howto_table[R_386_RELATIVE];
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case BFD_RELOC_386_GOTOFF:
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TRACE ("BFD_RELOC_386_GOTOFF");
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return &elf_howto_table[R_386_GOTOFF];
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case BFD_RELOC_386_GOTPC:
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TRACE ("BFD_RELOC_386_GOTPC");
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return &elf_howto_table[R_386_GOTPC];
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/* These relocs are a GNU extension. */
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case BFD_RELOC_386_TLS_TPOFF:
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TRACE ("BFD_RELOC_386_TLS_TPOFF");
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return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
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case BFD_RELOC_386_TLS_IE:
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TRACE ("BFD_RELOC_386_TLS_IE");
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return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
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case BFD_RELOC_386_TLS_GOTIE:
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TRACE ("BFD_RELOC_386_TLS_GOTIE");
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return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
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case BFD_RELOC_386_TLS_LE:
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TRACE ("BFD_RELOC_386_TLS_LE");
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return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
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case BFD_RELOC_386_TLS_GD:
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TRACE ("BFD_RELOC_386_TLS_GD");
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return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
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case BFD_RELOC_386_TLS_LDM:
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TRACE ("BFD_RELOC_386_TLS_LDM");
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return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
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case BFD_RELOC_16:
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TRACE ("BFD_RELOC_16");
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return &elf_howto_table[R_386_16 - R_386_ext_offset];
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case BFD_RELOC_16_PCREL:
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TRACE ("BFD_RELOC_16_PCREL");
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return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
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case BFD_RELOC_8:
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TRACE ("BFD_RELOC_8");
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return &elf_howto_table[R_386_8 - R_386_ext_offset];
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case BFD_RELOC_8_PCREL:
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TRACE ("BFD_RELOC_8_PCREL");
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return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
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/* Common with Sun TLS implementation. */
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case BFD_RELOC_386_TLS_LDO_32:
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TRACE ("BFD_RELOC_386_TLS_LDO_32");
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return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
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case BFD_RELOC_386_TLS_IE_32:
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TRACE ("BFD_RELOC_386_TLS_IE_32");
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return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
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case BFD_RELOC_386_TLS_LE_32:
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TRACE ("BFD_RELOC_386_TLS_LE_32");
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return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
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|
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case BFD_RELOC_386_TLS_DTPMOD32:
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TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
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return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
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|
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case BFD_RELOC_386_TLS_DTPOFF32:
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TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
|
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return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
|
||
|
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case BFD_RELOC_386_TLS_TPOFF32:
|
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TRACE ("BFD_RELOC_386_TLS_TPOFF32");
|
||
return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
|
||
|
||
case BFD_RELOC_SIZE32:
|
||
TRACE ("BFD_RELOC_SIZE32");
|
||
return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset];
|
||
|
||
case BFD_RELOC_386_TLS_GOTDESC:
|
||
TRACE ("BFD_RELOC_386_TLS_GOTDESC");
|
||
return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
|
||
|
||
case BFD_RELOC_386_TLS_DESC_CALL:
|
||
TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
|
||
return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
|
||
|
||
case BFD_RELOC_386_TLS_DESC:
|
||
TRACE ("BFD_RELOC_386_TLS_DESC");
|
||
return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
|
||
|
||
case BFD_RELOC_386_IRELATIVE:
|
||
TRACE ("BFD_RELOC_386_IRELATIVE");
|
||
return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
|
||
|
||
case BFD_RELOC_386_GOT32X:
|
||
TRACE ("BFD_RELOC_386_GOT32X");
|
||
return &elf_howto_table[R_386_GOT32X - R_386_tls_offset];
|
||
|
||
case BFD_RELOC_VTABLE_INHERIT:
|
||
TRACE ("BFD_RELOC_VTABLE_INHERIT");
|
||
return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
|
||
|
||
case BFD_RELOC_VTABLE_ENTRY:
|
||
TRACE ("BFD_RELOC_VTABLE_ENTRY");
|
||
return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
|
||
|
||
default:
|
||
break;
|
||
}
|
||
|
||
TRACE ("Unknown");
|
||
return 0;
|
||
}
|
||
|
||
static reloc_howto_type *
|
||
elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
|
||
const char *r_name)
|
||
{
|
||
unsigned int i;
|
||
|
||
for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
|
||
if (elf_howto_table[i].name != NULL
|
||
&& strcasecmp (elf_howto_table[i].name, r_name) == 0)
|
||
return &elf_howto_table[i];
|
||
|
||
return NULL;
|
||
}
|
||
|
||
static reloc_howto_type *
|
||
elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
|
||
{
|
||
unsigned int indx;
|
||
|
||
if ((indx = r_type) >= R_386_standard
|
||
&& ((indx = r_type - R_386_ext_offset) - R_386_standard
|
||
>= R_386_ext - R_386_standard)
|
||
&& ((indx = r_type - R_386_tls_offset) - R_386_ext
|
||
>= R_386_ext2 - R_386_ext)
|
||
&& ((indx = r_type - R_386_vt_offset) - R_386_ext2
|
||
>= R_386_vt - R_386_ext2))
|
||
{
|
||
(*_bfd_error_handler) (_("%B: invalid relocation type %d"),
|
||
abfd, (int) r_type);
|
||
indx = R_386_NONE;
|
||
}
|
||
/* PR 17512: file: 0f67f69d. */
|
||
if (elf_howto_table [indx].type != r_type)
|
||
return NULL;
|
||
return &elf_howto_table[indx];
|
||
}
|
||
|
||
static void
|
||
elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
|
||
arelent *cache_ptr,
|
||
Elf_Internal_Rela *dst)
|
||
{
|
||
unsigned int r_type = ELF32_R_TYPE (dst->r_info);
|
||
cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
|
||
}
|
||
|
||
/* Return whether a symbol name implies a local label. The UnixWare
|
||
2.1 cc generates temporary symbols that start with .X, so we
|
||
recognize them here. FIXME: do other SVR4 compilers also use .X?.
|
||
If so, we should move the .X recognition into
|
||
_bfd_elf_is_local_label_name. */
|
||
|
||
static bfd_boolean
|
||
elf_i386_is_local_label_name (bfd *abfd, const char *name)
|
||
{
|
||
if (name[0] == '.' && name[1] == 'X')
|
||
return TRUE;
|
||
|
||
return _bfd_elf_is_local_label_name (abfd, name);
|
||
}
|
||
|
||
/* Support for core dump NOTE sections. */
|
||
|
||
static bfd_boolean
|
||
elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
|
||
{
|
||
int offset;
|
||
size_t size;
|
||
|
||
if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
|
||
{
|
||
int pr_version = bfd_get_32 (abfd, note->descdata);
|
||
|
||
if (pr_version != 1)
|
||
return FALSE;
|
||
|
||
/* pr_cursig */
|
||
elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
|
||
|
||
/* pr_pid */
|
||
elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
|
||
|
||
/* pr_reg */
|
||
offset = 28;
|
||
size = bfd_get_32 (abfd, note->descdata + 8);
|
||
}
|
||
else
|
||
{
|
||
switch (note->descsz)
|
||
{
|
||
default:
|
||
return FALSE;
|
||
|
||
case 144: /* Linux/i386 */
|
||
/* pr_cursig */
|
||
elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
|
||
|
||
/* pr_pid */
|
||
elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
|
||
|
||
/* pr_reg */
|
||
offset = 72;
|
||
size = 68;
|
||
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* Make a ".reg/999" section. */
|
||
return _bfd_elfcore_make_pseudosection (abfd, ".reg",
|
||
size, note->descpos + offset);
|
||
}
|
||
|
||
static bfd_boolean
|
||
elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
|
||
{
|
||
if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
|
||
{
|
||
int pr_version = bfd_get_32 (abfd, note->descdata);
|
||
|
||
if (pr_version != 1)
|
||
return FALSE;
|
||
|
||
elf_tdata (abfd)->core->program
|
||
= _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
|
||
elf_tdata (abfd)->core->command
|
||
= _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
|
||
}
|
||
else
|
||
{
|
||
switch (note->descsz)
|
||
{
|
||
default:
|
||
return FALSE;
|
||
|
||
case 124: /* Linux/i386 elf_prpsinfo. */
|
||
elf_tdata (abfd)->core->pid
|
||
= bfd_get_32 (abfd, note->descdata + 12);
|
||
elf_tdata (abfd)->core->program
|
||
= _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
|
||
elf_tdata (abfd)->core->command
|
||
= _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
|
||
}
|
||
}
|
||
|
||
/* 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 i386 ELF linker.
|
||
|
||
In order to gain some understanding of code in this file without
|
||
knowing all the intricate details of the linker, note the
|
||
following:
|
||
|
||
Functions named elf_i386_* are called by external routines, other
|
||
functions are only called locally. elf_i386_* functions appear
|
||
in this file more or less in the order in which they are called
|
||
from external routines. eg. elf_i386_check_relocs is called
|
||
early in the link process, elf_i386_finish_dynamic_sections is
|
||
one of the last functions. */
|
||
|
||
|
||
/* The name of the dynamic interpreter. This is put in the .interp
|
||
section. */
|
||
|
||
#define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.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 procedure linkage table. */
|
||
|
||
#define PLT_ENTRY_SIZE 16
|
||
|
||
/* The first entry in an absolute procedure linkage table looks like
|
||
this. See the SVR4 ABI i386 supplement to see how this works.
|
||
Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
|
||
|
||
static const bfd_byte elf_i386_plt0_entry[12] =
|
||
{
|
||
0xff, 0x35, /* pushl contents of address */
|
||
0, 0, 0, 0, /* replaced with address of .got + 4. */
|
||
0xff, 0x25, /* jmp indirect */
|
||
0, 0, 0, 0 /* replaced with address of .got + 8. */
|
||
};
|
||
|
||
/* Subsequent entries in an absolute procedure linkage table look like
|
||
this. */
|
||
|
||
static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
|
||
{
|
||
0xff, 0x25, /* jmp indirect */
|
||
0, 0, 0, 0, /* replaced with address of this symbol in .got. */
|
||
0x68, /* pushl immediate */
|
||
0, 0, 0, 0, /* replaced with offset into relocation table. */
|
||
0xe9, /* jmp relative */
|
||
0, 0, 0, 0 /* replaced with offset to start of .plt. */
|
||
};
|
||
|
||
/* The first entry in a PIC procedure linkage table look like this.
|
||
Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
|
||
|
||
static const bfd_byte elf_i386_pic_plt0_entry[12] =
|
||
{
|
||
0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
|
||
0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
|
||
};
|
||
|
||
/* Subsequent entries in a PIC procedure linkage table look like this. */
|
||
|
||
static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
|
||
{
|
||
0xff, 0xa3, /* jmp *offset(%ebx) */
|
||
0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
|
||
0x68, /* pushl immediate */
|
||
0, 0, 0, 0, /* replaced with offset into relocation table. */
|
||
0xe9, /* jmp relative */
|
||
0, 0, 0, 0 /* replaced with offset to start of .plt. */
|
||
};
|
||
|
||
/* Entries in the GOT procedure linkage table look like this. */
|
||
|
||
static const bfd_byte elf_i386_got_plt_entry[8] =
|
||
{
|
||
0xff, 0x25, /* jmp indirect */
|
||
0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
|
||
0x66, 0x90 /* xchg %ax,%ax */
|
||
};
|
||
|
||
/* Entries in the PIC GOT procedure linkage table look like this. */
|
||
|
||
static const bfd_byte elf_i386_pic_got_plt_entry[8] =
|
||
{
|
||
0xff, 0xa3, /* jmp *offset(%ebx) */
|
||
0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
|
||
0x66, 0x90 /* xchg %ax,%ax */
|
||
};
|
||
|
||
/* .eh_frame covering the .plt section. */
|
||
|
||
static const bfd_byte elf_i386_eh_frame_plt[] =
|
||
{
|
||
#define PLT_CIE_LENGTH 20
|
||
#define PLT_FDE_LENGTH 36
|
||
#define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
|
||
#define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
|
||
PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
|
||
0, 0, 0, 0, /* CIE ID */
|
||
1, /* CIE version */
|
||
'z', 'R', 0, /* Augmentation string */
|
||
1, /* Code alignment factor */
|
||
0x7c, /* Data alignment factor */
|
||
8, /* Return address column */
|
||
1, /* Augmentation size */
|
||
DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
|
||
DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
|
||
DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
|
||
DW_CFA_nop, DW_CFA_nop,
|
||
|
||
PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
|
||
PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
|
||
0, 0, 0, 0, /* R_386_PC32 .plt goes here */
|
||
0, 0, 0, 0, /* .plt size goes here */
|
||
0, /* Augmentation size */
|
||
DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
|
||
DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
|
||
DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
|
||
DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
|
||
DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
|
||
11, /* Block length */
|
||
DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
|
||
DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
|
||
DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
|
||
DW_OP_lit2, DW_OP_shl, DW_OP_plus,
|
||
DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
|
||
};
|
||
|
||
struct elf_i386_plt_layout
|
||
{
|
||
/* The first entry in an absolute procedure linkage table looks like this. */
|
||
const bfd_byte *plt0_entry;
|
||
unsigned int plt0_entry_size;
|
||
|
||
/* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
|
||
unsigned int plt0_got1_offset;
|
||
unsigned int plt0_got2_offset;
|
||
|
||
/* Later entries in an absolute procedure linkage table look like this. */
|
||
const bfd_byte *plt_entry;
|
||
unsigned int plt_entry_size;
|
||
|
||
/* Offsets into plt_entry that are to be replaced with... */
|
||
unsigned int plt_got_offset; /* ... address of this symbol in .got. */
|
||
unsigned int plt_reloc_offset; /* ... offset into relocation table. */
|
||
unsigned int plt_plt_offset; /* ... offset to start of .plt. */
|
||
|
||
/* Offset into plt_entry where the initial value of the GOT entry points. */
|
||
unsigned int plt_lazy_offset;
|
||
|
||
/* The first entry in a PIC procedure linkage table looks like this. */
|
||
const bfd_byte *pic_plt0_entry;
|
||
|
||
/* Subsequent entries in a PIC procedure linkage table look like this. */
|
||
const bfd_byte *pic_plt_entry;
|
||
|
||
/* .eh_frame covering the .plt section. */
|
||
const bfd_byte *eh_frame_plt;
|
||
unsigned int eh_frame_plt_size;
|
||
};
|
||
|
||
#define GET_PLT_ENTRY_SIZE(abfd) \
|
||
get_elf_i386_backend_data (abfd)->plt->plt_entry_size
|
||
|
||
/* These are the standard parameters. */
|
||
static const struct elf_i386_plt_layout elf_i386_plt =
|
||
{
|
||
elf_i386_plt0_entry, /* plt0_entry */
|
||
sizeof (elf_i386_plt0_entry), /* plt0_entry_size */
|
||
2, /* plt0_got1_offset */
|
||
8, /* plt0_got2_offset */
|
||
elf_i386_plt_entry, /* plt_entry */
|
||
PLT_ENTRY_SIZE, /* plt_entry_size */
|
||
2, /* plt_got_offset */
|
||
7, /* plt_reloc_offset */
|
||
12, /* plt_plt_offset */
|
||
6, /* plt_lazy_offset */
|
||
elf_i386_pic_plt0_entry, /* pic_plt0_entry */
|
||
elf_i386_pic_plt_entry, /* pic_plt_entry */
|
||
elf_i386_eh_frame_plt, /* eh_frame_plt */
|
||
sizeof (elf_i386_eh_frame_plt), /* eh_frame_plt_size */
|
||
};
|
||
|
||
|
||
/* On VxWorks, the .rel.plt.unloaded section has absolute relocations
|
||
for the PLTResolve stub and then for each PLT entry. */
|
||
#define PLTRESOLVE_RELOCS_SHLIB 0
|
||
#define PLTRESOLVE_RELOCS 2
|
||
#define PLT_NON_JUMP_SLOT_RELOCS 2
|
||
|
||
/* Architecture-specific backend data for i386. */
|
||
|
||
struct elf_i386_backend_data
|
||
{
|
||
/* Parameters describing PLT generation. */
|
||
const struct elf_i386_plt_layout *plt;
|
||
|
||
/* Value used to fill the unused bytes of the first PLT entry. */
|
||
bfd_byte plt0_pad_byte;
|
||
|
||
/* True if the target system is VxWorks. */
|
||
int is_vxworks;
|
||
};
|
||
|
||
#define get_elf_i386_backend_data(abfd) \
|
||
((const struct elf_i386_backend_data *) \
|
||
get_elf_backend_data (abfd)->arch_data)
|
||
|
||
/* These are the standard parameters. */
|
||
static const struct elf_i386_backend_data elf_i386_arch_bed =
|
||
{
|
||
&elf_i386_plt, /* plt */
|
||
0, /* plt0_pad_byte */
|
||
0, /* is_vxworks */
|
||
};
|
||
|
||
#define elf_backend_arch_data &elf_i386_arch_bed
|
||
|
||
/* i386 ELF linker hash entry. */
|
||
|
||
struct elf_i386_link_hash_entry
|
||
{
|
||
struct elf_link_hash_entry elf;
|
||
|
||
/* Track dynamic relocs copied for this symbol. */
|
||
struct elf_dyn_relocs *dyn_relocs;
|
||
|
||
#define GOT_UNKNOWN 0
|
||
#define GOT_NORMAL 1
|
||
#define GOT_TLS_GD 2
|
||
#define GOT_TLS_IE 4
|
||
#define GOT_TLS_IE_POS 5
|
||
#define GOT_TLS_IE_NEG 6
|
||
#define GOT_TLS_IE_BOTH 7
|
||
#define GOT_TLS_GDESC 8
|
||
#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;
|
||
|
||
/* Symbol is referenced by R_386_GOTOFF relocation. */
|
||
unsigned int gotoff_ref : 1;
|
||
|
||
/* Reference count of C/C++ function pointer relocations in read-write
|
||
section which can be resolved at run-time. */
|
||
bfd_signed_vma func_pointer_refcount;
|
||
|
||
/* Information about the GOT PLT entry. Filled when there are both
|
||
GOT and PLT relocations against the same function. */
|
||
union gotplt_union plt_got;
|
||
|
||
/* Offset of the GOTPLT entry reserved for the TLS descriptor,
|
||
starting at the end of the jump table. */
|
||
bfd_vma tlsdesc_got;
|
||
};
|
||
|
||
#define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
|
||
|
||
struct elf_i386_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 elf_i386_tdata(abfd) \
|
||
((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
|
||
|
||
#define elf_i386_local_got_tls_type(abfd) \
|
||
(elf_i386_tdata (abfd)->local_got_tls_type)
|
||
|
||
#define elf_i386_local_tlsdesc_gotent(abfd) \
|
||
(elf_i386_tdata (abfd)->local_tlsdesc_gotent)
|
||
|
||
#define is_i386_elf(bfd) \
|
||
(bfd_get_flavour (bfd) == bfd_target_elf_flavour \
|
||
&& elf_tdata (bfd) != NULL \
|
||
&& elf_object_id (bfd) == I386_ELF_DATA)
|
||
|
||
static bfd_boolean
|
||
elf_i386_mkobject (bfd *abfd)
|
||
{
|
||
return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
|
||
I386_ELF_DATA);
|
||
}
|
||
|
||
/* i386 ELF linker hash table. */
|
||
|
||
struct elf_i386_link_hash_table
|
||
{
|
||
struct elf_link_hash_table elf;
|
||
|
||
/* Short-cuts to get to dynamic linker sections. */
|
||
asection *sdynbss;
|
||
asection *srelbss;
|
||
asection *plt_eh_frame;
|
||
asection *plt_got;
|
||
|
||
union
|
||
{
|
||
bfd_signed_vma refcount;
|
||
bfd_vma offset;
|
||
} tls_ldm_got;
|
||
|
||
/* The amount of space used by the reserved portion of the sgotplt
|
||
section, plus whatever space is used by the jump slots. */
|
||
bfd_vma sgotplt_jump_table_size;
|
||
|
||
/* Small local sym cache. */
|
||
struct sym_cache sym_cache;
|
||
|
||
/* _TLS_MODULE_BASE_ symbol. */
|
||
struct bfd_link_hash_entry *tls_module_base;
|
||
|
||
/* Used by local STT_GNU_IFUNC symbols. */
|
||
htab_t loc_hash_table;
|
||
void * loc_hash_memory;
|
||
|
||
/* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
|
||
asection *srelplt2;
|
||
|
||
/* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
|
||
bfd_vma next_tls_desc_index;
|
||
|
||
/* The index of the next unused R_386_JUMP_SLOT slot in .rel.plt. */
|
||
bfd_vma next_jump_slot_index;
|
||
|
||
/* The index of the next unused R_386_IRELATIVE slot in .rel.plt. */
|
||
bfd_vma next_irelative_index;
|
||
};
|
||
|
||
/* Get the i386 ELF linker hash table from a link_info structure. */
|
||
|
||
#define elf_i386_hash_table(p) \
|
||
(elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
|
||
== I386_ELF_DATA ? ((struct elf_i386_link_hash_table *) ((p)->hash)) : NULL)
|
||
|
||
#define elf_i386_compute_jump_table_size(htab) \
|
||
((htab)->elf.srelplt->reloc_count * 4)
|
||
|
||
/* Create an entry in an i386 ELF linker hash table. */
|
||
|
||
static struct bfd_hash_entry *
|
||
elf_i386_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 = (struct bfd_hash_entry *)
|
||
bfd_hash_allocate (table, sizeof (struct elf_i386_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 elf_i386_link_hash_entry *eh;
|
||
|
||
eh = (struct elf_i386_link_hash_entry *) entry;
|
||
eh->dyn_relocs = NULL;
|
||
eh->tls_type = GOT_UNKNOWN;
|
||
eh->gotoff_ref = 0;
|
||
eh->func_pointer_refcount = 0;
|
||
eh->plt_got.offset = (bfd_vma) -1;
|
||
eh->tlsdesc_got = (bfd_vma) -1;
|
||
}
|
||
|
||
return entry;
|
||
}
|
||
|
||
/* Compute a hash of a local hash entry. We use elf_link_hash_entry
|
||
for local symbol so that we can handle local STT_GNU_IFUNC symbols
|
||
as global symbol. We reuse indx and dynstr_index for local symbol
|
||
hash since they aren't used by global symbols in this backend. */
|
||
|
||
static hashval_t
|
||
elf_i386_local_htab_hash (const void *ptr)
|
||
{
|
||
struct elf_link_hash_entry *h
|
||
= (struct elf_link_hash_entry *) ptr;
|
||
return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
|
||
}
|
||
|
||
/* Compare local hash entries. */
|
||
|
||
static int
|
||
elf_i386_local_htab_eq (const void *ptr1, const void *ptr2)
|
||
{
|
||
struct elf_link_hash_entry *h1
|
||
= (struct elf_link_hash_entry *) ptr1;
|
||
struct elf_link_hash_entry *h2
|
||
= (struct elf_link_hash_entry *) ptr2;
|
||
|
||
return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
|
||
}
|
||
|
||
/* Find and/or create a hash entry for local symbol. */
|
||
|
||
static struct elf_link_hash_entry *
|
||
elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab,
|
||
bfd *abfd, const Elf_Internal_Rela *rel,
|
||
bfd_boolean create)
|
||
{
|
||
struct elf_i386_link_hash_entry e, *ret;
|
||
asection *sec = abfd->sections;
|
||
hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
|
||
ELF32_R_SYM (rel->r_info));
|
||
void **slot;
|
||
|
||
e.elf.indx = sec->id;
|
||
e.elf.dynstr_index = ELF32_R_SYM (rel->r_info);
|
||
slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
|
||
create ? INSERT : NO_INSERT);
|
||
|
||
if (!slot)
|
||
return NULL;
|
||
|
||
if (*slot)
|
||
{
|
||
ret = (struct elf_i386_link_hash_entry *) *slot;
|
||
return &ret->elf;
|
||
}
|
||
|
||
ret = (struct elf_i386_link_hash_entry *)
|
||
objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
|
||
sizeof (struct elf_i386_link_hash_entry));
|
||
if (ret)
|
||
{
|
||
memset (ret, 0, sizeof (*ret));
|
||
ret->elf.indx = sec->id;
|
||
ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info);
|
||
ret->elf.dynindx = -1;
|
||
ret->func_pointer_refcount = 0;
|
||
ret->plt_got.offset = (bfd_vma) -1;
|
||
*slot = ret;
|
||
}
|
||
return &ret->elf;
|
||
}
|
||
|
||
/* Destroy an i386 ELF linker hash table. */
|
||
|
||
static void
|
||
elf_i386_link_hash_table_free (bfd *obfd)
|
||
{
|
||
struct elf_i386_link_hash_table *htab
|
||
= (struct elf_i386_link_hash_table *) obfd->link.hash;
|
||
|
||
if (htab->loc_hash_table)
|
||
htab_delete (htab->loc_hash_table);
|
||
if (htab->loc_hash_memory)
|
||
objalloc_free ((struct objalloc *) htab->loc_hash_memory);
|
||
_bfd_elf_link_hash_table_free (obfd);
|
||
}
|
||
|
||
/* Create an i386 ELF linker hash table. */
|
||
|
||
static struct bfd_link_hash_table *
|
||
elf_i386_link_hash_table_create (bfd *abfd)
|
||
{
|
||
struct elf_i386_link_hash_table *ret;
|
||
bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
|
||
|
||
ret = (struct elf_i386_link_hash_table *) bfd_zmalloc (amt);
|
||
if (ret == NULL)
|
||
return NULL;
|
||
|
||
if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
|
||
elf_i386_link_hash_newfunc,
|
||
sizeof (struct elf_i386_link_hash_entry),
|
||
I386_ELF_DATA))
|
||
{
|
||
free (ret);
|
||
return NULL;
|
||
}
|
||
|
||
ret->loc_hash_table = htab_try_create (1024,
|
||
elf_i386_local_htab_hash,
|
||
elf_i386_local_htab_eq,
|
||
NULL);
|
||
ret->loc_hash_memory = objalloc_create ();
|
||
if (!ret->loc_hash_table || !ret->loc_hash_memory)
|
||
{
|
||
elf_i386_link_hash_table_free (abfd);
|
||
return NULL;
|
||
}
|
||
ret->elf.root.hash_table_free = elf_i386_link_hash_table_free;
|
||
|
||
return &ret->elf.root;
|
||
}
|
||
|
||
/* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
|
||
.rel.bss sections in DYNOBJ, and set up shortcuts to them in our
|
||
hash table. */
|
||
|
||
static bfd_boolean
|
||
elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
|
||
{
|
||
struct elf_i386_link_hash_table *htab;
|
||
|
||
if (!_bfd_elf_create_dynamic_sections (dynobj, info))
|
||
return FALSE;
|
||
|
||
htab = elf_i386_hash_table (info);
|
||
if (htab == NULL)
|
||
return FALSE;
|
||
|
||
htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
|
||
if (!htab->sdynbss)
|
||
abort ();
|
||
|
||
if (bfd_link_executable (info))
|
||
{
|
||
/* Always allow copy relocs for building executables. */
|
||
asection *s = bfd_get_linker_section (dynobj, ".rel.bss");
|
||
if (s == NULL)
|
||
{
|
||
const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
|
||
s = bfd_make_section_anyway_with_flags (dynobj,
|
||
".rel.bss",
|
||
(bed->dynamic_sec_flags
|
||
| SEC_READONLY));
|
||
if (s == NULL
|
||
|| ! bfd_set_section_alignment (dynobj, s,
|
||
bed->s->log_file_align))
|
||
return FALSE;
|
||
}
|
||
htab->srelbss = s;
|
||
}
|
||
|
||
if (get_elf_i386_backend_data (dynobj)->is_vxworks
|
||
&& !elf_vxworks_create_dynamic_sections (dynobj, info,
|
||
&htab->srelplt2))
|
||
return FALSE;
|
||
|
||
if (!info->no_ld_generated_unwind_info
|
||
&& htab->plt_eh_frame == NULL
|
||
&& htab->elf.splt != NULL)
|
||
{
|
||
flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
|
||
| SEC_HAS_CONTENTS | SEC_IN_MEMORY
|
||
| SEC_LINKER_CREATED);
|
||
htab->plt_eh_frame
|
||
= bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
|
||
if (htab->plt_eh_frame == NULL
|
||
|| !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 2))
|
||
return FALSE;
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Copy the extra info we tack onto an elf_link_hash_entry. */
|
||
|
||
static void
|
||
elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
|
||
struct elf_link_hash_entry *dir,
|
||
struct elf_link_hash_entry *ind)
|
||
{
|
||
struct elf_i386_link_hash_entry *edir, *eind;
|
||
|
||
edir = (struct elf_i386_link_hash_entry *) dir;
|
||
eind = (struct elf_i386_link_hash_entry *) ind;
|
||
|
||
if (eind->dyn_relocs != NULL)
|
||
{
|
||
if (edir->dyn_relocs != NULL)
|
||
{
|
||
struct elf_dyn_relocs **pp;
|
||
struct elf_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 elf_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;
|
||
}
|
||
|
||
/* Copy gotoff_ref so that elf_i386_adjust_dynamic_symbol will
|
||
generate a R_386_COPY reloc. */
|
||
edir->gotoff_ref |= eind->gotoff_ref;
|
||
|
||
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
|
||
{
|
||
if (eind->func_pointer_refcount > 0)
|
||
{
|
||
edir->func_pointer_refcount += eind->func_pointer_refcount;
|
||
eind->func_pointer_refcount = 0;
|
||
}
|
||
|
||
_bfd_elf_link_hash_copy_indirect (info, dir, ind);
|
||
}
|
||
}
|
||
|
||
/* Return TRUE if the TLS access code sequence support transition
|
||
from R_TYPE. */
|
||
|
||
static bfd_boolean
|
||
elf_i386_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, type;
|
||
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_386_TLS_GD:
|
||
case R_386_TLS_LDM:
|
||
if (offset < 2 || (rel + 1) >= relend)
|
||
return FALSE;
|
||
|
||
type = bfd_get_8 (abfd, contents + offset - 2);
|
||
if (r_type == R_386_TLS_GD)
|
||
{
|
||
/* Check transition from GD access model. Only
|
||
leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
|
||
leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
|
||
can transit to different access model. */
|
||
if ((offset + 10) > sec->size ||
|
||
(type != 0x8d && type != 0x04))
|
||
return FALSE;
|
||
|
||
val = bfd_get_8 (abfd, contents + offset - 1);
|
||
if (type == 0x04)
|
||
{
|
||
/* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
|
||
if (offset < 3)
|
||
return FALSE;
|
||
|
||
if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d)
|
||
return FALSE;
|
||
|
||
if ((val & 0xc7) != 0x05 || val == (4 << 3))
|
||
return FALSE;
|
||
}
|
||
else
|
||
{
|
||
/* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
|
||
if ((val & 0xf8) != 0x80 || (val & 7) == 4)
|
||
return FALSE;
|
||
|
||
if (bfd_get_8 (abfd, contents + offset + 9) != 0x90)
|
||
return FALSE;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* Check transition from LD access model. Only
|
||
leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
|
||
can transit to different access model. */
|
||
if (type != 0x8d || (offset + 9) > sec->size)
|
||
return FALSE;
|
||
|
||
val = bfd_get_8 (abfd, contents + offset - 1);
|
||
if ((val & 0xf8) != 0x80 || (val & 7) == 4)
|
||
return FALSE;
|
||
}
|
||
|
||
if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8)
|
||
return FALSE;
|
||
|
||
r_symndx = ELF32_R_SYM (rel[1].r_info);
|
||
if (r_symndx < symtab_hdr->sh_info)
|
||
return FALSE;
|
||
|
||
h = sym_hashes[r_symndx - symtab_hdr->sh_info];
|
||
/* Use strncmp to check ___tls_get_addr since ___tls_get_addr
|
||
may be versioned. */
|
||
return (h != NULL
|
||
&& h->root.root.string != NULL
|
||
&& (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
|
||
|| ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32)
|
||
&& (strncmp (h->root.root.string, "___tls_get_addr",
|
||
15) == 0));
|
||
|
||
case R_386_TLS_IE:
|
||
/* Check transition from IE access model:
|
||
movl foo@indntpoff(%rip), %eax
|
||
movl foo@indntpoff(%rip), %reg
|
||
addl foo@indntpoff(%rip), %reg
|
||
*/
|
||
|
||
if (offset < 1 || (offset + 4) > sec->size)
|
||
return FALSE;
|
||
|
||
/* Check "movl foo@tpoff(%rip), %eax" first. */
|
||
val = bfd_get_8 (abfd, contents + offset - 1);
|
||
if (val == 0xa1)
|
||
return TRUE;
|
||
|
||
if (offset < 2)
|
||
return FALSE;
|
||
|
||
/* Check movl|addl foo@tpoff(%rip), %reg. */
|
||
type = bfd_get_8 (abfd, contents + offset - 2);
|
||
return ((type == 0x8b || type == 0x03)
|
||
&& (val & 0xc7) == 0x05);
|
||
|
||
case R_386_TLS_GOTIE:
|
||
case R_386_TLS_IE_32:
|
||
/* Check transition from {IE_32,GOTIE} access model:
|
||
subl foo@{tpoff,gontoff}(%reg1), %reg2
|
||
movl foo@{tpoff,gontoff}(%reg1), %reg2
|
||
addl foo@{tpoff,gontoff}(%reg1), %reg2
|
||
*/
|
||
|
||
if (offset < 2 || (offset + 4) > sec->size)
|
||
return FALSE;
|
||
|
||
val = bfd_get_8 (abfd, contents + offset - 1);
|
||
if ((val & 0xc0) != 0x80 || (val & 7) == 4)
|
||
return FALSE;
|
||
|
||
type = bfd_get_8 (abfd, contents + offset - 2);
|
||
return type == 0x8b || type == 0x2b || type == 0x03;
|
||
|
||
case R_386_TLS_GOTDESC:
|
||
/* Check transition from GDesc access model:
|
||
leal x@tlsdesc(%ebx), %eax
|
||
|
||
Make sure it's a leal adding ebx to a 32-bit offset
|
||
into any register, although it's probably almost always
|
||
going to be eax. */
|
||
|
||
if (offset < 2 || (offset + 4) > sec->size)
|
||
return FALSE;
|
||
|
||
if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
|
||
return FALSE;
|
||
|
||
val = bfd_get_8 (abfd, contents + offset - 1);
|
||
return (val & 0xc7) == 0x83;
|
||
|
||
case R_386_TLS_DESC_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 const unsigned char call[] = { 0xff, 0x10 };
|
||
return memcmp (contents + offset, call, 2) == 0;
|
||
}
|
||
|
||
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
|
||
elf_i386_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 long r_symndx)
|
||
{
|
||
unsigned int from_type = *r_type;
|
||
unsigned int to_type = from_type;
|
||
bfd_boolean check = TRUE;
|
||
|
||
/* Skip TLS transition for functions. */
|
||
if (h != NULL
|
||
&& (h->type == STT_FUNC
|
||
|| h->type == STT_GNU_IFUNC))
|
||
return TRUE;
|
||
|
||
switch (from_type)
|
||
{
|
||
case R_386_TLS_GD:
|
||
case R_386_TLS_GOTDESC:
|
||
case R_386_TLS_DESC_CALL:
|
||
case R_386_TLS_IE_32:
|
||
case R_386_TLS_IE:
|
||
case R_386_TLS_GOTIE:
|
||
if (bfd_link_executable (info))
|
||
{
|
||
if (h == NULL)
|
||
to_type = R_386_TLS_LE_32;
|
||
else if (from_type != R_386_TLS_IE
|
||
&& from_type != R_386_TLS_GOTIE)
|
||
to_type = R_386_TLS_IE_32;
|
||
}
|
||
|
||
/* When we are called from elf_i386_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 (bfd_link_executable (info)
|
||
&& h != NULL
|
||
&& h->dynindx == -1
|
||
&& (tls_type & GOT_TLS_IE))
|
||
new_to_type = R_386_TLS_LE_32;
|
||
|
||
if (to_type == R_386_TLS_GD
|
||
|| to_type == R_386_TLS_GOTDESC
|
||
|| to_type == R_386_TLS_DESC_CALL)
|
||
{
|
||
if (tls_type == GOT_TLS_IE_POS)
|
||
new_to_type = R_386_TLS_GOTIE;
|
||
else if (tls_type & GOT_TLS_IE)
|
||
new_to_type = R_386_TLS_IE_32;
|
||
}
|
||
|
||
/* We checked the transition before when we were called from
|
||
elf_i386_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_386_TLS_LDM:
|
||
if (bfd_link_executable (info))
|
||
to_type = R_386_TLS_LE_32;
|
||
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
|
||
&& ! elf_i386_check_tls_transition (abfd, sec, contents,
|
||
symtab_hdr, sym_hashes,
|
||
from_type, rel, relend))
|
||
{
|
||
reloc_howto_type *from, *to;
|
||
const char *name;
|
||
|
||
from = elf_i386_rtype_to_howto (abfd, from_type);
|
||
to = elf_i386_rtype_to_howto (abfd, to_type);
|
||
|
||
if (h)
|
||
name = h->root.root.string;
|
||
else
|
||
{
|
||
struct elf_i386_link_hash_table *htab;
|
||
|
||
htab = elf_i386_hash_table (info);
|
||
if (htab == NULL)
|
||
name = "*unknown*";
|
||
else
|
||
{
|
||
Elf_Internal_Sym *isym;
|
||
|
||
isym = bfd_sym_from_r_symndx (&htab->sym_cache,
|
||
abfd, r_symndx);
|
||
name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
|
||
}
|
||
}
|
||
|
||
(*_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, name,
|
||
(unsigned long) rel->r_offset);
|
||
bfd_set_error (bfd_error_bad_value);
|
||
return FALSE;
|
||
}
|
||
|
||
*r_type = to_type;
|
||
return TRUE;
|
||
}
|
||
|
||
/* Rename some of the generic section flags to better document how they
|
||
are used here. */
|
||
#define need_convert_load sec_flg0
|
||
|
||
/* 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
|
||
elf_i386_check_relocs (bfd *abfd,
|
||
struct bfd_link_info *info,
|
||
asection *sec,
|
||
const Elf_Internal_Rela *relocs)
|
||
{
|
||
struct elf_i386_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;
|
||
bfd_boolean use_plt_got;
|
||
|
||
if (bfd_link_relocatable (info))
|
||
return TRUE;
|
||
|
||
BFD_ASSERT (is_i386_elf (abfd));
|
||
|
||
htab = elf_i386_hash_table (info);
|
||
if (htab == NULL)
|
||
return FALSE;
|
||
|
||
use_plt_got = (!get_elf_i386_backend_data (abfd)->is_vxworks
|
||
&& (get_elf_i386_backend_data (abfd)
|
||
== &elf_i386_arch_bed));
|
||
|
||
symtab_hdr = &elf_symtab_hdr (abfd);
|
||
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;
|
||
struct elf_i386_link_hash_entry *eh;
|
||
Elf_Internal_Sym *isym;
|
||
const char *name;
|
||
bfd_boolean size_reloc;
|
||
|
||
r_symndx = ELF32_R_SYM (rel->r_info);
|
||
r_type = ELF32_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)
|
||
{
|
||
/* A local symbol. */
|
||
isym = bfd_sym_from_r_symndx (&htab->sym_cache,
|
||
abfd, r_symndx);
|
||
if (isym == NULL)
|
||
return FALSE;
|
||
|
||
/* Check relocation against local STT_GNU_IFUNC symbol. */
|
||
if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
|
||
{
|
||
h = elf_i386_get_local_sym_hash (htab, abfd, rel, TRUE);
|
||
if (h == NULL)
|
||
return FALSE;
|
||
|
||
/* Fake a STT_GNU_IFUNC symbol. */
|
||
h->type = STT_GNU_IFUNC;
|
||
h->def_regular = 1;
|
||
h->ref_regular = 1;
|
||
h->forced_local = 1;
|
||
h->root.type = bfd_link_hash_defined;
|
||
}
|
||
else
|
||
h = NULL;
|
||
}
|
||
else
|
||
{
|
||
isym = NULL;
|
||
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 elf_i386_link_hash_entry *) h;
|
||
if (h != NULL)
|
||
{
|
||
/* Create the ifunc sections for static executables. If we
|
||
never see an indirect function symbol nor we are building
|
||
a static executable, those sections will be empty and
|
||
won't appear in output. */
|
||
switch (r_type)
|
||
{
|
||
default:
|
||
break;
|
||
|
||
case R_386_GOTOFF:
|
||
eh->gotoff_ref = 1;
|
||
case R_386_32:
|
||
case R_386_PC32:
|
||
case R_386_PLT32:
|
||
case R_386_GOT32:
|
||
case R_386_GOT32X:
|
||
if (htab->elf.dynobj == NULL)
|
||
htab->elf.dynobj = abfd;
|
||
if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info))
|
||
return FALSE;
|
||
break;
|
||
}
|
||
|
||
/* It is referenced by a non-shared object. */
|
||
h->ref_regular = 1;
|
||
h->root.non_ir_ref = 1;
|
||
|
||
if (h->type == STT_GNU_IFUNC)
|
||
elf_tdata (info->output_bfd)->has_gnu_symbols
|
||
|= elf_gnu_symbol_ifunc;
|
||
}
|
||
|
||
if (! elf_i386_tls_transition (info, abfd, sec, NULL,
|
||
symtab_hdr, sym_hashes,
|
||
&r_type, GOT_UNKNOWN,
|
||
rel, rel_end, h, r_symndx))
|
||
return FALSE;
|
||
|
||
switch (r_type)
|
||
{
|
||
case R_386_TLS_LDM:
|
||
htab->tls_ldm_got.refcount += 1;
|
||
goto create_got;
|
||
|
||
case R_386_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_386_SIZE32:
|
||
size_reloc = TRUE;
|
||
goto do_size;
|
||
|
||
case R_386_TLS_IE_32:
|
||
case R_386_TLS_IE:
|
||
case R_386_TLS_GOTIE:
|
||
if (!bfd_link_executable (info))
|
||
info->flags |= DF_STATIC_TLS;
|
||
/* Fall through */
|
||
|
||
case R_386_GOT32:
|
||
case R_386_GOT32X:
|
||
case R_386_TLS_GD:
|
||
case R_386_TLS_GOTDESC:
|
||
case R_386_TLS_DESC_CALL:
|
||
/* This symbol requires a global offset table entry. */
|
||
{
|
||
int tls_type, old_tls_type;
|
||
|
||
switch (r_type)
|
||
{
|
||
default:
|
||
case R_386_GOT32:
|
||
case R_386_GOT32X:
|
||
tls_type = GOT_NORMAL;
|
||
break;
|
||
case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
|
||
case R_386_TLS_GOTDESC:
|
||
case R_386_TLS_DESC_CALL:
|
||
tls_type = GOT_TLS_GDESC; break;
|
||
case R_386_TLS_IE_32:
|
||
if (ELF32_R_TYPE (rel->r_info) == r_type)
|
||
tls_type = GOT_TLS_IE_NEG;
|
||
else
|
||
/* If this is a GD->IE transition, we may use either of
|
||
R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
|
||
tls_type = GOT_TLS_IE;
|
||
break;
|
||
case R_386_TLS_IE:
|
||
case R_386_TLS_GOTIE:
|
||
tls_type = GOT_TLS_IE_POS; break;
|
||
}
|
||
|
||
if (h != NULL)
|
||
{
|
||
h->got.refcount += 1;
|
||
old_tls_type = elf_i386_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;
|
||
elf_i386_local_tlsdesc_gotent (abfd)
|
||
= (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
|
||
elf_i386_local_got_tls_type (abfd)
|
||
= (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
|
||
}
|
||
local_got_refcounts[r_symndx] += 1;
|
||
old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
|
||
}
|
||
|
||
if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
|
||
tls_type |= old_tls_type;
|
||
/* If a TLS symbol is accessed using IE at least once,
|
||
there is no point to use dynamic model for it. */
|
||
else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
|
||
&& (! GOT_TLS_GD_ANY_P (old_tls_type)
|
||
|| (tls_type & GOT_TLS_IE) == 0))
|
||
{
|
||
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
|
||
{
|
||
if (h)
|
||
name = h->root.root.string;
|
||
else
|
||
name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
|
||
NULL);
|
||
(*_bfd_error_handler)
|
||
(_("%B: `%s' accessed both as normal and "
|
||
"thread local symbol"),
|
||
abfd, name);
|
||
bfd_set_error (bfd_error_bad_value);
|
||
return FALSE;
|
||
}
|
||
}
|
||
|
||
if (old_tls_type != tls_type)
|
||
{
|
||
if (h != NULL)
|
||
elf_i386_hash_entry (h)->tls_type = tls_type;
|
||
else
|
||
elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
|
||
}
|
||
}
|
||
/* Fall through */
|
||
|
||
case R_386_GOTOFF:
|
||
case R_386_GOTPC:
|
||
create_got:
|
||
if (htab->elf.sgot == NULL)
|
||
{
|
||
if (htab->elf.dynobj == NULL)
|
||
htab->elf.dynobj = abfd;
|
||
if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
|
||
return FALSE;
|
||
}
|
||
if (r_type != R_386_TLS_IE)
|
||
break;
|
||
/* Fall through */
|
||
|
||
case R_386_TLS_LE_32:
|
||
case R_386_TLS_LE:
|
||
if (bfd_link_executable (info))
|
||
break;
|
||
info->flags |= DF_STATIC_TLS;
|
||
/* Fall through */
|
||
|
||
case R_386_32:
|
||
case R_386_PC32:
|
||
if (h != NULL && bfd_link_executable (info))
|
||
{
|
||
/* 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_386_PC32)
|
||
{
|
||
/* Since something like ".long foo - ." may be used
|
||
as pointer, make sure that PLT is used if foo is
|
||
a function defined in a shared library. */
|
||
if ((sec->flags & SEC_CODE) == 0)
|
||
h->pointer_equality_needed = 1;
|
||
}
|
||
else
|
||
{
|
||
h->pointer_equality_needed = 1;
|
||
/* R_386_32 can be resolved at run-time. */
|
||
if (r_type == R_386_32
|
||
&& (sec->flags & SEC_READONLY) == 0)
|
||
eh->func_pointer_refcount += 1;
|
||
}
|
||
}
|
||
|
||
size_reloc = FALSE;
|
||
do_size:
|
||
/* 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 ((bfd_link_pic (info)
|
||
&& (sec->flags & SEC_ALLOC) != 0
|
||
&& (r_type != R_386_PC32
|
||
|| (h != NULL
|
||
&& (! SYMBOLIC_BIND (info, h)
|
||
|| h->root.type == bfd_link_hash_defweak
|
||
|| !h->def_regular))))
|
||
|| (ELIMINATE_COPY_RELOCS
|
||
&& !bfd_link_pic (info)
|
||
&& (sec->flags & SEC_ALLOC) != 0
|
||
&& h != NULL
|
||
&& (h->root.type == bfd_link_hash_defweak
|
||
|| !h->def_regular)))
|
||
{
|
||
struct elf_dyn_relocs *p;
|
||
struct elf_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)
|
||
{
|
||
if (htab->elf.dynobj == NULL)
|
||
htab->elf.dynobj = abfd;
|
||
|
||
sreloc = _bfd_elf_make_dynamic_reloc_section
|
||
(sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
|
||
|
||
if (sreloc == NULL)
|
||
return FALSE;
|
||
}
|
||
|
||
/* If this is a global symbol, we count the number of
|
||
relocations we need for this symbol. */
|
||
if (h != NULL)
|
||
{
|
||
head = &eh->dyn_relocs;
|
||
}
|
||
else
|
||
{
|
||
/* Track dynamic relocs needed for local syms too.
|
||
We really need local syms available to do this
|
||
easily. Oh well. */
|
||
void **vpp;
|
||
asection *s;
|
||
|
||
isym = bfd_sym_from_r_symndx (&htab->sym_cache,
|
||
abfd, r_symndx);
|
||
if (isym == NULL)
|
||
return FALSE;
|
||
|
||
s = bfd_section_from_elf_index (abfd, isym->st_shndx);
|
||
if (s == NULL)
|
||
s = sec;
|
||
|
||
vpp = &elf_section_data (s)->local_dynrel;
|
||
head = (struct elf_dyn_relocs **)vpp;
|
||
}
|
||
|
||
p = *head;
|
||
if (p == NULL || p->sec != sec)
|
||
{
|
||
bfd_size_type amt = sizeof *p;
|
||
p = (struct elf_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;
|
||
/* Count size relocation as PC-relative relocation. */
|
||
if (r_type == R_386_PC32 || size_reloc)
|
||
p->pc_count += 1;
|
||
}
|
||
break;
|
||
|
||
/* This relocation describes the C++ object vtable hierarchy.
|
||
Reconstruct it for later use during GC. */
|
||
case R_386_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_386_GNU_VTENTRY:
|
||
BFD_ASSERT (h != NULL);
|
||
if (h != NULL
|
||
&& !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
|
||
return FALSE;
|
||
break;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
|
||
if (use_plt_got
|
||
&& h != NULL
|
||
&& h->plt.refcount > 0
|
||
&& (((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
|
||
|| h->got.refcount > 0)
|
||
&& htab->plt_got == NULL)
|
||
{
|
||
/* Create the GOT procedure linkage table. */
|
||
unsigned int plt_got_align;
|
||
const struct elf_backend_data *bed;
|
||
|
||
bed = get_elf_backend_data (info->output_bfd);
|
||
BFD_ASSERT (sizeof (elf_i386_got_plt_entry) == 8
|
||
&& (sizeof (elf_i386_got_plt_entry)
|
||
== sizeof (elf_i386_pic_got_plt_entry)));
|
||
plt_got_align = 3;
|
||
|
||
if (htab->elf.dynobj == NULL)
|
||
htab->elf.dynobj = abfd;
|
||
htab->plt_got
|
||
= bfd_make_section_anyway_with_flags (htab->elf.dynobj,
|
||
".plt.got",
|
||
(bed->dynamic_sec_flags
|
||
| SEC_ALLOC
|
||
| SEC_CODE
|
||
| SEC_LOAD
|
||
| SEC_READONLY));
|
||
if (htab->plt_got == NULL
|
||
|| !bfd_set_section_alignment (htab->elf.dynobj,
|
||
htab->plt_got,
|
||
plt_got_align))
|
||
return FALSE;
|
||
}
|
||
|
||
if ((r_type == R_386_GOT32 || r_type == R_386_GOT32X)
|
||
&& (h == NULL || h->type != STT_GNU_IFUNC))
|
||
sec->need_convert_load = 1;
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Return the section that should be marked against GC for a given
|
||
relocation. */
|
||
|
||
static asection *
|
||
elf_i386_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 (ELF32_R_TYPE (rel->r_info))
|
||
{
|
||
case R_386_GNU_VTINHERIT:
|
||
case R_386_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
|
||
elf_i386_gc_sweep_hook (bfd *abfd,
|
||
struct bfd_link_info *info,
|
||
asection *sec,
|
||
const Elf_Internal_Rela *relocs)
|
||
{
|
||
struct elf_i386_link_hash_table *htab;
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
struct elf_link_hash_entry **sym_hashes;
|
||
bfd_signed_vma *local_got_refcounts;
|
||
const Elf_Internal_Rela *rel, *relend;
|
||
|
||
if (bfd_link_relocatable (info))
|
||
return TRUE;
|
||
|
||
htab = elf_i386_hash_table (info);
|
||
if (htab == NULL)
|
||
return FALSE;
|
||
|
||
elf_section_data (sec)->local_dynrel = NULL;
|
||
|
||
symtab_hdr = &elf_symtab_hdr (abfd);
|
||
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 = ELF32_R_SYM (rel->r_info);
|
||
if (r_symndx >= symtab_hdr->sh_info)
|
||
{
|
||
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;
|
||
}
|
||
else
|
||
{
|
||
/* A local symbol. */
|
||
Elf_Internal_Sym *isym;
|
||
|
||
isym = bfd_sym_from_r_symndx (&htab->sym_cache,
|
||
abfd, r_symndx);
|
||
|
||
/* Check relocation against local STT_GNU_IFUNC symbol. */
|
||
if (isym != NULL
|
||
&& ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
|
||
{
|
||
h = elf_i386_get_local_sym_hash (htab, abfd, rel, FALSE);
|
||
if (h == NULL)
|
||
abort ();
|
||
}
|
||
}
|
||
|
||
if (h)
|
||
{
|
||
struct elf_i386_link_hash_entry *eh;
|
||
struct elf_dyn_relocs **pp;
|
||
struct elf_dyn_relocs *p;
|
||
|
||
eh = (struct elf_i386_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 = ELF32_R_TYPE (rel->r_info);
|
||
if (! elf_i386_tls_transition (info, abfd, sec, NULL,
|
||
symtab_hdr, sym_hashes,
|
||
&r_type, GOT_UNKNOWN,
|
||
rel, relend, h, r_symndx))
|
||
return FALSE;
|
||
|
||
switch (r_type)
|
||
{
|
||
case R_386_TLS_LDM:
|
||
if (htab->tls_ldm_got.refcount > 0)
|
||
htab->tls_ldm_got.refcount -= 1;
|
||
break;
|
||
|
||
case R_386_TLS_GD:
|
||
case R_386_TLS_GOTDESC:
|
||
case R_386_TLS_DESC_CALL:
|
||
case R_386_TLS_IE_32:
|
||
case R_386_TLS_IE:
|
||
case R_386_TLS_GOTIE:
|
||
case R_386_GOT32:
|
||
case R_386_GOT32X:
|
||
if (h != NULL)
|
||
{
|
||
if (h->got.refcount > 0)
|
||
h->got.refcount -= 1;
|
||
if (h->type == STT_GNU_IFUNC)
|
||
{
|
||
if (h->plt.refcount > 0)
|
||
h->plt.refcount -= 1;
|
||
}
|
||
}
|
||
else if (local_got_refcounts != NULL)
|
||
{
|
||
if (local_got_refcounts[r_symndx] > 0)
|
||
local_got_refcounts[r_symndx] -= 1;
|
||
}
|
||
break;
|
||
|
||
case R_386_32:
|
||
case R_386_PC32:
|
||
case R_386_SIZE32:
|
||
if (bfd_link_pic (info)
|
||
&& (h == NULL || h->type != STT_GNU_IFUNC))
|
||
break;
|
||
/* Fall through */
|
||
|
||
case R_386_PLT32:
|
||
if (h != NULL)
|
||
{
|
||
if (h->plt.refcount > 0)
|
||
h->plt.refcount -= 1;
|
||
if (r_type == R_386_32
|
||
&& (sec->flags & SEC_READONLY) == 0)
|
||
{
|
||
struct elf_i386_link_hash_entry *eh
|
||
= (struct elf_i386_link_hash_entry *) h;
|
||
if (eh->func_pointer_refcount > 0)
|
||
eh->func_pointer_refcount -= 1;
|
||
}
|
||
}
|
||
break;
|
||
|
||
case R_386_GOTOFF:
|
||
if (h != NULL && h->type == STT_GNU_IFUNC)
|
||
{
|
||
if (h->got.refcount > 0)
|
||
h->got.refcount -= 1;
|
||
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
|
||
elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
|
||
struct elf_link_hash_entry *h)
|
||
{
|
||
struct elf_i386_link_hash_table *htab;
|
||
asection *s;
|
||
struct elf_i386_link_hash_entry *eh;
|
||
struct elf_dyn_relocs *p;
|
||
|
||
/* STT_GNU_IFUNC symbol must go through PLT. */
|
||
if (h->type == STT_GNU_IFUNC)
|
||
{
|
||
/* All local STT_GNU_IFUNC references must be treate as local
|
||
calls via local PLT. */
|
||
if (h->ref_regular
|
||
&& SYMBOL_CALLS_LOCAL (info, h))
|
||
{
|
||
bfd_size_type pc_count = 0, count = 0;
|
||
struct elf_dyn_relocs **pp;
|
||
|
||
eh = (struct elf_i386_link_hash_entry *) h;
|
||
for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
|
||
{
|
||
pc_count += p->pc_count;
|
||
p->count -= p->pc_count;
|
||
p->pc_count = 0;
|
||
count += p->count;
|
||
if (p->count == 0)
|
||
*pp = p->next;
|
||
else
|
||
pp = &p->next;
|
||
}
|
||
|
||
if (pc_count || count)
|
||
{
|
||
h->needs_plt = 1;
|
||
h->non_got_ref = 1;
|
||
if (h->plt.refcount <= 0)
|
||
h->plt.refcount = 1;
|
||
else
|
||
h->plt.refcount += 1;
|
||
}
|
||
}
|
||
|
||
if (h->plt.refcount <= 0)
|
||
{
|
||
h->plt.offset = (bfd_vma) -1;
|
||
h->needs_plt = 0;
|
||
}
|
||
return TRUE;
|
||
}
|
||
|
||
/* 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_386_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 (!bfd_link_executable (info))
|
||
return TRUE;
|
||
|
||
/* If there are no references to this symbol that do not use the
|
||
GOT nor R_386_GOTOFF relocation, we don't need to generate a copy
|
||
reloc. */
|
||
eh = (struct elf_i386_link_hash_entry *) h;
|
||
if (!h->non_got_ref && !eh->gotoff_ref)
|
||
return TRUE;
|
||
|
||
/* If -z nocopyreloc was given, we won't generate them either. */
|
||
if (info->nocopyreloc)
|
||
{
|
||
h->non_got_ref = 0;
|
||
return TRUE;
|
||
}
|
||
|
||
htab = elf_i386_hash_table (info);
|
||
if (htab == NULL)
|
||
return FALSE;
|
||
|
||
/* If there aren't any dynamic relocs in read-only sections nor
|
||
R_386_GOTOFF relocation, then we can keep the dynamic relocs and
|
||
avoid the copy reloc. This doesn't work on VxWorks, where we can
|
||
not have dynamic relocations (other than copy and jump slot
|
||
relocations) in an executable. */
|
||
if (ELIMINATE_COPY_RELOCS
|
||
&& !eh->gotoff_ref
|
||
&& !get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
|
||
{
|
||
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 (p == NULL)
|
||
{
|
||
h->non_got_ref = 0;
|
||
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. */
|
||
|
||
/* We must generate a R_386_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 && h->size != 0)
|
||
{
|
||
htab->srelbss->size += sizeof (Elf32_External_Rel);
|
||
h->needs_copy = 1;
|
||
}
|
||
|
||
s = htab->sdynbss;
|
||
|
||
return _bfd_elf_adjust_dynamic_copy (info, h, s);
|
||
}
|
||
|
||
/* Allocate space in .plt, .got and associated reloc sections for
|
||
dynamic relocs. */
|
||
|
||
static bfd_boolean
|
||
elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
|
||
{
|
||
struct bfd_link_info *info;
|
||
struct elf_i386_link_hash_table *htab;
|
||
struct elf_i386_link_hash_entry *eh;
|
||
struct elf_dyn_relocs *p;
|
||
unsigned plt_entry_size;
|
||
|
||
if (h->root.type == bfd_link_hash_indirect)
|
||
return TRUE;
|
||
|
||
eh = (struct elf_i386_link_hash_entry *) h;
|
||
|
||
info = (struct bfd_link_info *) inf;
|
||
htab = elf_i386_hash_table (info);
|
||
if (htab == NULL)
|
||
return FALSE;
|
||
|
||
plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
|
||
|
||
/* Clear the reference count of function pointer relocations if
|
||
symbol isn't a normal function. */
|
||
if (h->type != STT_FUNC)
|
||
eh->func_pointer_refcount = 0;
|
||
|
||
/* We can't use the GOT PLT if pointer equality is needed since
|
||
finish_dynamic_symbol won't clear symbol value and the dynamic
|
||
linker won't update the GOT slot. We will get into an infinite
|
||
loop at run-time. */
|
||
if (htab->plt_got != NULL
|
||
&& h->type != STT_GNU_IFUNC
|
||
&& !h->pointer_equality_needed
|
||
&& h->plt.refcount > 0
|
||
&& h->got.refcount > 0)
|
||
{
|
||
/* Don't use the regular PLT if there are both GOT and GOTPLT
|
||
reloctions. */
|
||
h->plt.offset = (bfd_vma) -1;
|
||
|
||
/* Use the GOT PLT. */
|
||
eh->plt_got.refcount = 1;
|
||
}
|
||
|
||
/* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
|
||
here if it is defined and referenced in a non-shared object. */
|
||
if (h->type == STT_GNU_IFUNC
|
||
&& h->def_regular)
|
||
return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
|
||
plt_entry_size,
|
||
plt_entry_size, 4);
|
||
/* Don't create the PLT entry if there are only function pointer
|
||
relocations which can be resolved at run-time. */
|
||
else if (htab->elf.dynamic_sections_created
|
||
&& (h->plt.refcount > eh->func_pointer_refcount
|
||
|| eh->plt_got.refcount > 0))
|
||
{
|
||
bfd_boolean use_plt_got;
|
||
|
||
/* Clear the reference count of function pointer relocations
|
||
if PLT is used. */
|
||
eh->func_pointer_refcount = 0;
|
||
|
||
if ((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
|
||
{
|
||
/* Don't use the regular PLT for DF_BIND_NOW. */
|
||
h->plt.offset = (bfd_vma) -1;
|
||
|
||
/* Use the GOT PLT. */
|
||
h->got.refcount = 1;
|
||
eh->plt_got.refcount = 1;
|
||
}
|
||
|
||
use_plt_got = eh->plt_got.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 (bfd_link_pic (info)
|
||
|| WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
|
||
{
|
||
asection *s = htab->elf.splt;
|
||
asection *got_s = htab->plt_got;
|
||
|
||
/* If this is the first .plt entry, make room for the special
|
||
first entry. The .plt section is used by prelink to undo
|
||
prelinking for dynamic relocations. */
|
||
if (s->size == 0)
|
||
s->size = plt_entry_size;
|
||
|
||
if (use_plt_got)
|
||
eh->plt_got.offset = got_s->size;
|
||
else
|
||
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 (! bfd_link_pic (info)
|
||
&& !h->def_regular)
|
||
{
|
||
if (use_plt_got)
|
||
{
|
||
/* We need to make a call to the entry of the GOT PLT
|
||
instead of regular PLT entry. */
|
||
h->root.u.def.section = got_s;
|
||
h->root.u.def.value = eh->plt_got.offset;
|
||
}
|
||
else
|
||
{
|
||
h->root.u.def.section = s;
|
||
h->root.u.def.value = h->plt.offset;
|
||
}
|
||
}
|
||
|
||
/* Make room for this entry. */
|
||
if (use_plt_got)
|
||
got_s->size += sizeof (elf_i386_got_plt_entry);
|
||
else
|
||
{
|
||
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->elf.sgotplt->size += 4;
|
||
|
||
/* We also need to make an entry in the .rel.plt section. */
|
||
htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
|
||
htab->elf.srelplt->reloc_count++;
|
||
}
|
||
|
||
if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks
|
||
&& !bfd_link_pic (info))
|
||
{
|
||
/* VxWorks has a second set of relocations for each PLT entry
|
||
in executables. They go in a separate relocation section,
|
||
which is processed by the kernel loader. */
|
||
|
||
/* There are two relocations for the initial PLT entry: an
|
||
R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
|
||
R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
|
||
|
||
if (h->plt.offset == plt_entry_size)
|
||
htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
|
||
|
||
/* There are two extra relocations for each subsequent PLT entry:
|
||
an R_386_32 relocation for the GOT entry, and an R_386_32
|
||
relocation for the PLT entry. */
|
||
|
||
htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
h->plt.offset = (bfd_vma) -1;
|
||
h->needs_plt = 0;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
h->plt.offset = (bfd_vma) -1;
|
||
h->needs_plt = 0;
|
||
}
|
||
|
||
eh->tlsdesc_got = (bfd_vma) -1;
|
||
|
||
/* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
|
||
make it a R_386_TLS_LE_32 requiring no TLS entry. */
|
||
if (h->got.refcount > 0
|
||
&& bfd_link_executable (info)
|
||
&& h->dynindx == -1
|
||
&& (elf_i386_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 = elf_i386_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;
|
||
}
|
||
|
||
s = htab->elf.sgot;
|
||
if (GOT_TLS_GDESC_P (tls_type))
|
||
{
|
||
eh->tlsdesc_got = htab->elf.sgotplt->size
|
||
- elf_i386_compute_jump_table_size (htab);
|
||
htab->elf.sgotplt->size += 8;
|
||
h->got.offset = (bfd_vma) -2;
|
||
}
|
||
if (! GOT_TLS_GDESC_P (tls_type)
|
||
|| GOT_TLS_GD_P (tls_type))
|
||
{
|
||
h->got.offset = s->size;
|
||
s->size += 4;
|
||
/* R_386_TLS_GD needs 2 consecutive GOT slots. */
|
||
if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
|
||
s->size += 4;
|
||
}
|
||
dyn = htab->elf.dynamic_sections_created;
|
||
/* R_386_TLS_IE_32 needs one dynamic relocation,
|
||
R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
|
||
(but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
|
||
need two), R_386_TLS_GD needs one if local symbol and two if
|
||
global. */
|
||
if (tls_type == GOT_TLS_IE_BOTH)
|
||
htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
|
||
else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
|
||
|| (tls_type & GOT_TLS_IE))
|
||
htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
|
||
else if (GOT_TLS_GD_P (tls_type))
|
||
htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
|
||
else if (! GOT_TLS_GDESC_P (tls_type)
|
||
&& (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
|
||
|| h->root.type != bfd_link_hash_undefweak)
|
||
&& (bfd_link_pic (info)
|
||
|| WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
|
||
htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
|
||
if (GOT_TLS_GDESC_P (tls_type))
|
||
htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
|
||
}
|
||
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 (bfd_link_pic (info))
|
||
{
|
||
/* The only reloc that uses pc_count is R_386_PC32, which will
|
||
appear on a call or on something like ".long foo - .". 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 assembly like ".long foo - .". */
|
||
if (SYMBOL_CALLS_LOCAL (info, h))
|
||
{
|
||
struct elf_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;
|
||
}
|
||
}
|
||
|
||
if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
|
||
{
|
||
struct elf_dyn_relocs **pp;
|
||
for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
|
||
{
|
||
if (strcmp (p->sec->output_section->name, ".tls_vars") == 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. Keep dynamic relocations for run-time function
|
||
pointer initialization. */
|
||
|
||
if ((!h->non_got_ref || eh->func_pointer_refcount > 0)
|
||
&& ((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;
|
||
eh->func_pointer_refcount = 0;
|
||
|
||
keep: ;
|
||
}
|
||
|
||
/* Finally, allocate space. */
|
||
for (p = eh->dyn_relocs; p != NULL; p = p->next)
|
||
{
|
||
asection *sreloc;
|
||
|
||
sreloc = elf_section_data (p->sec)->sreloc;
|
||
|
||
BFD_ASSERT (sreloc != NULL);
|
||
sreloc->size += p->count * sizeof (Elf32_External_Rel);
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Allocate space in .plt, .got and associated reloc sections for
|
||
local dynamic relocs. */
|
||
|
||
static bfd_boolean
|
||
elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
|
||
{
|
||
struct elf_link_hash_entry *h
|
||
= (struct elf_link_hash_entry *) *slot;
|
||
|
||
if (h->type != STT_GNU_IFUNC
|
||
|| !h->def_regular
|
||
|| !h->ref_regular
|
||
|| !h->forced_local
|
||
|| h->root.type != bfd_link_hash_defined)
|
||
abort ();
|
||
|
||
return elf_i386_allocate_dynrelocs (h, inf);
|
||
}
|
||
|
||
/* Find any dynamic relocs that apply to read-only sections. */
|
||
|
||
static bfd_boolean
|
||
elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
|
||
{
|
||
struct elf_i386_link_hash_entry *eh;
|
||
struct elf_dyn_relocs *p;
|
||
|
||
/* Skip local IFUNC symbols. */
|
||
if (h->forced_local && h->type == STT_GNU_IFUNC)
|
||
return TRUE;
|
||
|
||
eh = (struct elf_i386_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;
|
||
|
||
if ((info->warn_shared_textrel && bfd_link_pic (info))
|
||
|| info->error_textrel)
|
||
info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
|
||
p->sec->owner, h->root.root.string,
|
||
p->sec);
|
||
|
||
/* Not an error, just cut short the traversal. */
|
||
return FALSE;
|
||
}
|
||
}
|
||
return TRUE;
|
||
}
|
||
|
||
/* With the local symbol, foo, we convert
|
||
mov foo@GOT[(%reg1)], %reg2
|
||
to
|
||
lea foo[@GOTOFF(%reg1)], %reg2
|
||
and convert
|
||
call/jmp *foo@GOT[(%reg)]
|
||
to
|
||
nop call foo/jmp foo nop
|
||
When PIC is false, convert
|
||
test %reg1, foo@GOT[(%reg2)]
|
||
to
|
||
test $foo, %reg1
|
||
and convert
|
||
binop foo@GOT[(%reg1)], %reg2
|
||
to
|
||
binop $foo, %reg2
|
||
where binop is one of adc, add, and, cmp, or, sbb, sub, xor
|
||
instructions. */
|
||
|
||
static bfd_boolean
|
||
elf_i386_convert_load (bfd *abfd, asection *sec,
|
||
struct bfd_link_info *link_info)
|
||
{
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
Elf_Internal_Rela *internal_relocs;
|
||
Elf_Internal_Rela *irel, *irelend;
|
||
bfd_byte *contents;
|
||
struct elf_i386_link_hash_table *htab;
|
||
bfd_boolean changed_contents;
|
||
bfd_boolean changed_relocs;
|
||
bfd_signed_vma *local_got_refcounts;
|
||
|
||
/* Don't even try to convert non-ELF outputs. */
|
||
if (!is_elf_hash_table (link_info->hash))
|
||
return FALSE;
|
||
|
||
/* Nothing to do if there is no need or no output. */
|
||
if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
|
||
|| sec->need_convert_load == 0
|
||
|| bfd_is_abs_section (sec->output_section))
|
||
return TRUE;
|
||
|
||
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
|
||
|
||
/* Load the relocations for this section. */
|
||
internal_relocs = (_bfd_elf_link_read_relocs
|
||
(abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
|
||
link_info->keep_memory));
|
||
if (internal_relocs == NULL)
|
||
return FALSE;
|
||
|
||
htab = elf_i386_hash_table (link_info);
|
||
changed_contents = FALSE;
|
||
changed_relocs = FALSE;
|
||
local_got_refcounts = elf_local_got_refcounts (abfd);
|
||
|
||
/* Get the section contents. */
|
||
if (elf_section_data (sec)->this_hdr.contents != NULL)
|
||
contents = elf_section_data (sec)->this_hdr.contents;
|
||
else
|
||
{
|
||
if (!bfd_malloc_and_get_section (abfd, sec, &contents))
|
||
goto error_return;
|
||
}
|
||
|
||
irelend = internal_relocs + sec->reloc_count;
|
||
for (irel = internal_relocs; irel < irelend; irel++)
|
||
{
|
||
unsigned int r_type = ELF32_R_TYPE (irel->r_info);
|
||
unsigned int r_symndx = ELF32_R_SYM (irel->r_info);
|
||
unsigned int indx;
|
||
struct elf_link_hash_entry *h;
|
||
unsigned int opcode;
|
||
unsigned int modrm;
|
||
bfd_vma roff;
|
||
bfd_boolean baseless;
|
||
Elf_Internal_Sym *isym;
|
||
unsigned int addend;
|
||
unsigned int nop;
|
||
bfd_vma nop_offset;
|
||
|
||
if (r_type != R_386_GOT32 && r_type != R_386_GOT32X)
|
||
continue;
|
||
|
||
roff = irel->r_offset;
|
||
if (roff < 2)
|
||
continue;
|
||
|
||
/* Addend for R_386_GOT32 and R_386_GOT32X relocations must be 0. */
|
||
addend = bfd_get_32 (abfd, contents + roff);
|
||
if (addend != 0)
|
||
continue;
|
||
|
||
modrm = bfd_get_8 (abfd, contents + roff - 1);
|
||
baseless = (modrm & 0xc7) == 0x5;
|
||
|
||
if (r_type == R_386_GOT32X
|
||
&& baseless
|
||
&& bfd_link_pic (link_info))
|
||
{
|
||
/* For PIC, disallow R_386_GOT32X without a base register
|
||
since we don't know what the GOT base is. Allow
|
||
R_386_GOT32 for existing object files. */
|
||
const char *name;
|
||
|
||
if (r_symndx < symtab_hdr->sh_info)
|
||
{
|
||
isym = bfd_sym_from_r_symndx (&htab->sym_cache, abfd,
|
||
r_symndx);
|
||
name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
|
||
}
|
||
else
|
||
{
|
||
indx = r_symndx - symtab_hdr->sh_info;
|
||
h = elf_sym_hashes (abfd)[indx];
|
||
BFD_ASSERT (h != NULL);
|
||
name = h->root.root.string;
|
||
}
|
||
|
||
(*_bfd_error_handler)
|
||
(_("%B: direct GOT relocation R_386_GOT32X against `%s' without base register can not be used when making a shared object"),
|
||
abfd, name);
|
||
goto error_return;
|
||
}
|
||
|
||
opcode = bfd_get_8 (abfd, contents + roff - 2);
|
||
|
||
/* It is OK to convert mov to lea. */
|
||
if (opcode != 0x8b)
|
||
{
|
||
/* Only convert R_386_GOT32X relocation for call, jmp or
|
||
one of adc, add, and, cmp, or, sbb, sub, test, xor
|
||
instructions. */
|
||
if (r_type != R_386_GOT32X)
|
||
continue;
|
||
|
||
/* It is OK to convert indirect branch to direct branch. It
|
||
is OK to convert adc, add, and, cmp, or, sbb, sub, test,
|
||
xor only when PIC is false. */
|
||
if (opcode != 0xff && bfd_link_pic (link_info))
|
||
continue;
|
||
}
|
||
|
||
/* Try to convert R_386_GOT32 and R_386_GOT32X. Get the symbol
|
||
referred to by the reloc. */
|
||
if (r_symndx < symtab_hdr->sh_info)
|
||
{
|
||
isym = bfd_sym_from_r_symndx (&htab->sym_cache,
|
||
abfd, r_symndx);
|
||
|
||
/* STT_GNU_IFUNC must keep GOT32 relocations. */
|
||
if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
|
||
continue;
|
||
|
||
h = NULL;
|
||
if (opcode == 0x0ff)
|
||
/* Convert "call/jmp *foo@GOT[(%reg)]". */
|
||
goto convert_branch;
|
||
else
|
||
/* Convert "mov foo@GOT[(%reg1)], %reg2",
|
||
"test %reg1, foo@GOT(%reg2)" and
|
||
"binop foo@GOT[(%reg1)], %reg2". */
|
||
goto convert_load;
|
||
}
|
||
|
||
indx = r_symndx - symtab_hdr->sh_info;
|
||
h = elf_sym_hashes (abfd)[indx];
|
||
BFD_ASSERT (h != NULL);
|
||
|
||
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;
|
||
|
||
/* STT_GNU_IFUNC must keep GOT32 relocations. */
|
||
if (h->type == STT_GNU_IFUNC)
|
||
continue;
|
||
|
||
if (opcode == 0xff)
|
||
{
|
||
/* We have "call/jmp *foo@GOT[(%reg)]". */
|
||
if ((h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak)
|
||
&& SYMBOL_REFERENCES_LOCAL (link_info, h))
|
||
{
|
||
/* The function is locally defined. */
|
||
convert_branch:
|
||
/* Convert R_386_GOT32X to R_386_PC32. */
|
||
if (modrm == 0x15 || (modrm & 0xf8) == 0x90)
|
||
{
|
||
/* Convert to "nop call foo". ADDR_PREFIX_OPCODE
|
||
is a nop prefix. */
|
||
modrm = 0xe8;
|
||
nop = link_info->call_nop_byte;
|
||
if (link_info->call_nop_as_suffix)
|
||
{
|
||
nop_offset = roff + 3;
|
||
irel->r_offset -= 1;
|
||
}
|
||
else
|
||
nop_offset = roff - 2;
|
||
}
|
||
else
|
||
{
|
||
/* Convert to "jmp foo nop". */
|
||
modrm = 0xe9;
|
||
nop = NOP_OPCODE;
|
||
nop_offset = roff + 3;
|
||
irel->r_offset -= 1;
|
||
}
|
||
|
||
bfd_put_8 (abfd, nop, contents + nop_offset);
|
||
bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
|
||
/* When converting to PC-relative relocation, we
|
||
need to adjust addend by -4. */
|
||
bfd_put_32 (abfd, -4, contents + irel->r_offset);
|
||
irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32);
|
||
|
||
if (h)
|
||
{
|
||
if (h->got.refcount > 0)
|
||
h->got.refcount -= 1;
|
||
}
|
||
else
|
||
{
|
||
if (local_got_refcounts != NULL
|
||
&& local_got_refcounts[r_symndx] > 0)
|
||
local_got_refcounts[r_symndx] -= 1;
|
||
}
|
||
|
||
changed_contents = TRUE;
|
||
changed_relocs = TRUE;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* We have "mov foo@GOT[(%re1g)], %reg2",
|
||
"test %reg1, foo@GOT(%reg2)" and
|
||
"binop foo@GOT[(%reg1)], %reg2".
|
||
|
||
Avoid optimizing _DYNAMIC since ld.so may use its
|
||
link-time address. */
|
||
if (h == htab->elf.hdynamic)
|
||
continue;
|
||
|
||
/* def_regular is set by an assignment in a linker script in
|
||
bfd_elf_record_link_assignment. */
|
||
if ((h->def_regular
|
||
|| h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak)
|
||
&& SYMBOL_REFERENCES_LOCAL (link_info, h))
|
||
{
|
||
convert_load:
|
||
if (opcode == 0x8b)
|
||
{
|
||
/* Convert "mov foo@GOT(%reg1), %reg2" to
|
||
"lea foo@GOTOFF(%reg1), %reg2". */
|
||
if (r_type == R_386_GOT32X
|
||
&& (baseless || !bfd_link_pic (link_info)))
|
||
{
|
||
r_type = R_386_32;
|
||
/* For R_386_32, convert
|
||
"lea foo@GOTOFF(%reg1), %reg2" to
|
||
"lea foo@GOT, %reg2". */
|
||
if (!baseless)
|
||
{
|
||
modrm = 0x5 | (modrm & 0x38);
|
||
bfd_put_8 (abfd, modrm, contents + roff - 1);
|
||
}
|
||
}
|
||
else
|
||
r_type = R_386_GOTOFF;
|
||
opcode = 0x8d;
|
||
}
|
||
else
|
||
{
|
||
if (opcode == 0x85)
|
||
{
|
||
/* Convert "test %reg1, foo@GOT(%reg2)" to
|
||
"test $foo, %reg1". */
|
||
modrm = 0xc0 | (modrm & 0x38) >> 3;
|
||
opcode = 0xf7;
|
||
}
|
||
else
|
||
{
|
||
/* Convert "binop foo@GOT(%reg1), %reg2" to
|
||
"binop $foo, %reg2". */
|
||
modrm = (0xc0
|
||
| (modrm & 0x38) >> 3
|
||
| (opcode & 0x3c));
|
||
opcode = 0x81;
|
||
}
|
||
bfd_put_8 (abfd, modrm, contents + roff - 1);
|
||
r_type = R_386_32;
|
||
}
|
||
|
||
bfd_put_8 (abfd, opcode, contents + roff - 2);
|
||
irel->r_info = ELF32_R_INFO (r_symndx, r_type);
|
||
|
||
if (h)
|
||
{
|
||
if (h->got.refcount > 0)
|
||
h->got.refcount -= 1;
|
||
}
|
||
else
|
||
{
|
||
if (local_got_refcounts != NULL
|
||
&& local_got_refcounts[r_symndx] > 0)
|
||
local_got_refcounts[r_symndx] -= 1;
|
||
}
|
||
|
||
changed_contents = TRUE;
|
||
changed_relocs = TRUE;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (contents != NULL
|
||
&& elf_section_data (sec)->this_hdr.contents != contents)
|
||
{
|
||
if (!changed_contents && !link_info->keep_memory)
|
||
free (contents);
|
||
else
|
||
{
|
||
/* Cache the section contents for elf_link_input_bfd. */
|
||
elf_section_data (sec)->this_hdr.contents = contents;
|
||
}
|
||
}
|
||
|
||
if (elf_section_data (sec)->relocs != internal_relocs)
|
||
{
|
||
if (!changed_relocs)
|
||
free (internal_relocs);
|
||
else
|
||
elf_section_data (sec)->relocs = internal_relocs;
|
||
}
|
||
|
||
return TRUE;
|
||
|
||
error_return:
|
||
if (contents != NULL
|
||
&& elf_section_data (sec)->this_hdr.contents != contents)
|
||
free (contents);
|
||
if (internal_relocs != NULL
|
||
&& elf_section_data (sec)->relocs != internal_relocs)
|
||
free (internal_relocs);
|
||
return FALSE;
|
||
}
|
||
|
||
/* Set the sizes of the dynamic sections. */
|
||
|
||
static bfd_boolean
|
||
elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
|
||
{
|
||
struct elf_i386_link_hash_table *htab;
|
||
bfd *dynobj;
|
||
asection *s;
|
||
bfd_boolean relocs;
|
||
bfd *ibfd;
|
||
|
||
htab = elf_i386_hash_table (info);
|
||
if (htab == NULL)
|
||
return FALSE;
|
||
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 (bfd_link_executable (info) && !info->nointerp)
|
||
{
|
||
s = bfd_get_linker_section (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 (! is_i386_elf (ibfd))
|
||
continue;
|
||
|
||
for (s = ibfd->sections; s != NULL; s = s->next)
|
||
{
|
||
struct elf_dyn_relocs *p;
|
||
|
||
if (!elf_i386_convert_load (ibfd, s, info))
|
||
return FALSE;
|
||
|
||
for (p = ((struct elf_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 (get_elf_i386_backend_data (output_bfd)->is_vxworks
|
||
&& strcmp (p->sec->output_section->name,
|
||
".tls_vars") == 0)
|
||
{
|
||
/* Relocations in vxworks .tls_vars sections are
|
||
handled specially by the loader. */
|
||
}
|
||
else if (p->count != 0)
|
||
{
|
||
srel = elf_section_data (p->sec)->sreloc;
|
||
srel->size += p->count * sizeof (Elf32_External_Rel);
|
||
if ((p->sec->output_section->flags & SEC_READONLY) != 0
|
||
&& (info->flags & DF_TEXTREL) == 0)
|
||
{
|
||
info->flags |= DF_TEXTREL;
|
||
if ((info->warn_shared_textrel && bfd_link_pic (info))
|
||
|| info->error_textrel)
|
||
info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
|
||
p->sec->owner, p->sec);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
local_got = elf_local_got_refcounts (ibfd);
|
||
if (!local_got)
|
||
continue;
|
||
|
||
symtab_hdr = &elf_symtab_hdr (ibfd);
|
||
locsymcount = symtab_hdr->sh_info;
|
||
end_local_got = local_got + locsymcount;
|
||
local_tls_type = elf_i386_local_got_tls_type (ibfd);
|
||
local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
|
||
s = htab->elf.sgot;
|
||
srel = htab->elf.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->elf.sgotplt->size
|
||
- elf_i386_compute_jump_table_size (htab);
|
||
htab->elf.sgotplt->size += 8;
|
||
*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 += 4;
|
||
if (GOT_TLS_GD_P (*local_tls_type)
|
||
|| *local_tls_type == GOT_TLS_IE_BOTH)
|
||
s->size += 4;
|
||
}
|
||
if (bfd_link_pic (info)
|
||
|| GOT_TLS_GD_ANY_P (*local_tls_type)
|
||
|| (*local_tls_type & GOT_TLS_IE))
|
||
{
|
||
if (*local_tls_type == GOT_TLS_IE_BOTH)
|
||
srel->size += 2 * sizeof (Elf32_External_Rel);
|
||
else if (GOT_TLS_GD_P (*local_tls_type)
|
||
|| ! GOT_TLS_GDESC_P (*local_tls_type))
|
||
srel->size += sizeof (Elf32_External_Rel);
|
||
if (GOT_TLS_GDESC_P (*local_tls_type))
|
||
htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
|
||
}
|
||
}
|
||
else
|
||
*local_got = (bfd_vma) -1;
|
||
}
|
||
}
|
||
|
||
if (htab->tls_ldm_got.refcount > 0)
|
||
{
|
||
/* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
|
||
relocs. */
|
||
htab->tls_ldm_got.offset = htab->elf.sgot->size;
|
||
htab->elf.sgot->size += 8;
|
||
htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
|
||
}
|
||
else
|
||
htab->tls_ldm_got.offset = -1;
|
||
|
||
/* Allocate global sym .plt and .got entries, and space for global
|
||
sym dynamic relocs. */
|
||
elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
|
||
|
||
/* Allocate .plt and .got entries, and space for local symbols. */
|
||
htab_traverse (htab->loc_hash_table,
|
||
elf_i386_allocate_local_dynrelocs,
|
||
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.
|
||
|
||
PR ld/13302: We start next_irelative_index at the end of .rela.plt
|
||
so that R_386_IRELATIVE entries come last. */
|
||
if (htab->elf.srelplt)
|
||
{
|
||
htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
|
||
htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
|
||
htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
|
||
}
|
||
else if (htab->elf.irelplt)
|
||
htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
|
||
|
||
|
||
if (htab->elf.sgotplt)
|
||
{
|
||
/* Don't allocate .got.plt section if there are no GOT nor PLT
|
||
entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
|
||
if ((htab->elf.hgot == NULL
|
||
|| !htab->elf.hgot->ref_regular_nonweak)
|
||
&& (htab->elf.sgotplt->size
|
||
== get_elf_backend_data (output_bfd)->got_header_size)
|
||
&& (htab->elf.splt == NULL
|
||
|| htab->elf.splt->size == 0)
|
||
&& (htab->elf.sgot == NULL
|
||
|| htab->elf.sgot->size == 0)
|
||
&& (htab->elf.iplt == NULL
|
||
|| htab->elf.iplt->size == 0)
|
||
&& (htab->elf.igotplt == NULL
|
||
|| htab->elf.igotplt->size == 0))
|
||
htab->elf.sgotplt->size = 0;
|
||
}
|
||
|
||
|
||
if (htab->plt_eh_frame != NULL
|
||
&& htab->elf.splt != NULL
|
||
&& htab->elf.splt->size != 0
|
||
&& !bfd_is_abs_section (htab->elf.splt->output_section)
|
||
&& _bfd_elf_eh_frame_present (info))
|
||
htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt);
|
||
|
||
/* 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)
|
||
{
|
||
bfd_boolean strip_section = TRUE;
|
||
|
||
if ((s->flags & SEC_LINKER_CREATED) == 0)
|
||
continue;
|
||
|
||
if (s == htab->elf.splt
|
||
|| s == htab->elf.sgot)
|
||
{
|
||
/* Strip this section if we don't need it; see the
|
||
comment below. */
|
||
/* We'd like to strip these sections if they aren't needed, but if
|
||
we've exported dynamic symbols from them we must leave them.
|
||
It's too late to tell BFD to get rid of the symbols. */
|
||
|
||
if (htab->elf.hplt != NULL)
|
||
strip_section = FALSE;
|
||
}
|
||
else if (s == htab->elf.sgotplt
|
||
|| s == htab->elf.iplt
|
||
|| s == htab->elf.igotplt
|
||
|| s == htab->plt_got
|
||
|| s == htab->plt_eh_frame
|
||
|| s == htab->sdynbss)
|
||
{
|
||
/* Strip these too. */
|
||
}
|
||
else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
|
||
{
|
||
if (s->size != 0
|
||
&& s != htab->elf.srelplt
|
||
&& s != htab->srelplt2)
|
||
relocs = TRUE;
|
||
|
||
/* We use the reloc_count field as a counter if we need
|
||
to copy relocs into the output file. */
|
||
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 .rel.bss and
|
||
.rel.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. */
|
||
if (strip_section)
|
||
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_386_NONE reloc instead
|
||
of garbage. */
|
||
s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
|
||
if (s->contents == NULL)
|
||
return FALSE;
|
||
}
|
||
|
||
if (htab->plt_eh_frame != NULL
|
||
&& htab->plt_eh_frame->contents != NULL)
|
||
{
|
||
memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt,
|
||
sizeof (elf_i386_eh_frame_plt));
|
||
bfd_put_32 (dynobj, htab->elf.splt->size,
|
||
htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
|
||
}
|
||
|
||
if (htab->elf.dynamic_sections_created)
|
||
{
|
||
/* Add some entries to the .dynamic section. We fill in the
|
||
values later, in elf_i386_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 (bfd_link_executable (info))
|
||
{
|
||
if (!add_dynamic_entry (DT_DEBUG, 0))
|
||
return FALSE;
|
||
}
|
||
|
||
if (htab->elf.splt->size != 0)
|
||
{
|
||
/* DT_PLTGOT is used by prelink even if there is no PLT
|
||
relocation. */
|
||
if (!add_dynamic_entry (DT_PLTGOT, 0))
|
||
return FALSE;
|
||
|
||
if (htab->elf.srelplt->size != 0)
|
||
{
|
||
if (!add_dynamic_entry (DT_PLTRELSZ, 0)
|
||
|| !add_dynamic_entry (DT_PLTREL, DT_REL)
|
||
|| !add_dynamic_entry (DT_JMPREL, 0))
|
||
return FALSE;
|
||
}
|
||
}
|
||
|
||
if (relocs)
|
||
{
|
||
if (!add_dynamic_entry (DT_REL, 0)
|
||
|| !add_dynamic_entry (DT_RELSZ, 0)
|
||
|| !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
|
||
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,
|
||
elf_i386_readonly_dynrelocs, info);
|
||
|
||
if ((info->flags & DF_TEXTREL) != 0)
|
||
{
|
||
if ((elf_tdata (output_bfd)->has_gnu_symbols
|
||
& elf_gnu_symbol_ifunc) == elf_gnu_symbol_ifunc)
|
||
{
|
||
info->callbacks->einfo
|
||
(_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
|
||
bfd_set_error (bfd_error_bad_value);
|
||
return FALSE;
|
||
}
|
||
|
||
if (!add_dynamic_entry (DT_TEXTREL, 0))
|
||
return FALSE;
|
||
}
|
||
}
|
||
if (get_elf_i386_backend_data (output_bfd)->is_vxworks
|
||
&& !elf_vxworks_add_dynamic_entries (output_bfd, info))
|
||
return FALSE;
|
||
}
|
||
#undef add_dynamic_entry
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
static bfd_boolean
|
||
elf_i386_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 elf_i386_link_hash_table *htab;
|
||
struct bfd_link_hash_entry *bh = NULL;
|
||
const struct elf_backend_data *bed
|
||
= get_elf_backend_data (output_bfd);
|
||
|
||
htab = elf_i386_hash_table (info);
|
||
if (htab == NULL)
|
||
return FALSE;
|
||
|
||
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;
|
||
|
||
htab->tls_module_base = bh;
|
||
|
||
tlsbase = (struct elf_link_hash_entry *)bh;
|
||
tlsbase->def_regular = 1;
|
||
tlsbase->other = STV_HIDDEN;
|
||
tlsbase->root.linker_def = 1;
|
||
(*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
|
||
}
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Set the correct type for an x86 ELF section. We do this by the
|
||
section name, which is a hack, but ought to work. */
|
||
|
||
static bfd_boolean
|
||
elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
|
||
Elf_Internal_Shdr *hdr,
|
||
asection *sec)
|
||
{
|
||
const char *name;
|
||
|
||
name = bfd_get_section_name (abfd, sec);
|
||
|
||
/* This is an ugly, but unfortunately necessary hack that is
|
||
needed when producing EFI binaries on x86. It tells
|
||
elf.c:elf_fake_sections() not to consider ".reloc" as a section
|
||
containing ELF relocation info. We need this hack in order to
|
||
be able to generate ELF binaries that can be translated into
|
||
EFI applications (which are essentially COFF objects). Those
|
||
files contain a COFF ".reloc" section inside an ELFNN object,
|
||
which would normally cause BFD to segfault because it would
|
||
attempt to interpret this section as containing relocation
|
||
entries for section "oc". With this hack enabled, ".reloc"
|
||
will be treated as a normal data section, which will avoid the
|
||
segfault. However, you won't be able to create an ELFNN binary
|
||
with a section named "oc" that needs relocations, but that's
|
||
the kind of ugly side-effects you get when detecting section
|
||
types based on their names... In practice, this limitation is
|
||
unlikely to bite. */
|
||
if (strcmp (name, ".reloc") == 0)
|
||
hdr->sh_type = SHT_PROGBITS;
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* _TLS_MODULE_BASE_ needs to be treated especially when linking
|
||
executables. Rather than setting it to the beginning of the TLS
|
||
section, we have to set it to the end. This function may be called
|
||
multiple times, it is idempotent. */
|
||
|
||
static void
|
||
elf_i386_set_tls_module_base (struct bfd_link_info *info)
|
||
{
|
||
struct elf_i386_link_hash_table *htab;
|
||
struct bfd_link_hash_entry *base;
|
||
|
||
if (!bfd_link_executable (info))
|
||
return;
|
||
|
||
htab = elf_i386_hash_table (info);
|
||
if (htab == NULL)
|
||
return;
|
||
|
||
base = htab->tls_module_base;
|
||
if (base == NULL)
|
||
return;
|
||
|
||
base->u.def.value = htab->elf.tls_size;
|
||
}
|
||
|
||
/* 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
|
||
elf_i386_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
|
||
elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
|
||
{
|
||
struct elf_link_hash_table *htab = elf_hash_table (info);
|
||
const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
|
||
bfd_vma static_tls_size;
|
||
|
||
/* If tls_sec is NULL, we should have signalled an error already. */
|
||
if (htab->tls_sec == NULL)
|
||
return 0;
|
||
|
||
/* Consider special static TLS alignment requirements. */
|
||
static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
|
||
return static_tls_size + htab->tls_sec->vma - address;
|
||
}
|
||
|
||
/* Relocate an i386 ELF section. */
|
||
|
||
static bfd_boolean
|
||
elf_i386_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 elf_i386_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 *wrel;
|
||
Elf_Internal_Rela *relend;
|
||
bfd_boolean is_vxworks_tls;
|
||
unsigned plt_entry_size;
|
||
|
||
BFD_ASSERT (is_i386_elf (input_bfd));
|
||
|
||
htab = elf_i386_hash_table (info);
|
||
if (htab == NULL)
|
||
return FALSE;
|
||
symtab_hdr = &elf_symtab_hdr (input_bfd);
|
||
sym_hashes = elf_sym_hashes (input_bfd);
|
||
local_got_offsets = elf_local_got_offsets (input_bfd);
|
||
local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
|
||
/* We have to handle relocations in vxworks .tls_vars sections
|
||
specially, because the dynamic loader is 'weird'. */
|
||
is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
|
||
&& bfd_link_pic (info)
|
||
&& !strcmp (input_section->output_section->name,
|
||
".tls_vars"));
|
||
|
||
elf_i386_set_tls_module_base (info);
|
||
|
||
plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
|
||
|
||
rel = wrel = relocs;
|
||
relend = relocs + input_section->reloc_count;
|
||
for (; rel < relend; wrel++, rel++)
|
||
{
|
||
unsigned int r_type;
|
||
reloc_howto_type *howto;
|
||
unsigned long r_symndx;
|
||
struct elf_link_hash_entry *h;
|
||
struct elf_i386_link_hash_entry *eh;
|
||
Elf_Internal_Sym *sym;
|
||
asection *sec;
|
||
bfd_vma off, offplt, plt_offset;
|
||
bfd_vma relocation;
|
||
bfd_boolean unresolved_reloc;
|
||
bfd_reloc_status_type r;
|
||
unsigned int indx;
|
||
int tls_type;
|
||
bfd_vma st_size;
|
||
asection *resolved_plt;
|
||
|
||
r_type = ELF32_R_TYPE (rel->r_info);
|
||
if (r_type == R_386_GNU_VTINHERIT
|
||
|| r_type == R_386_GNU_VTENTRY)
|
||
{
|
||
if (wrel != rel)
|
||
*wrel = *rel;
|
||
continue;
|
||
}
|
||
|
||
if ((indx = r_type) >= R_386_standard
|
||
&& ((indx = r_type - R_386_ext_offset) - R_386_standard
|
||
>= R_386_ext - R_386_standard)
|
||
&& ((indx = r_type - R_386_tls_offset) - R_386_ext
|
||
>= R_386_ext2 - R_386_ext))
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%B: unrecognized relocation (0x%x) in section `%A'"),
|
||
input_bfd, input_section, r_type);
|
||
bfd_set_error (bfd_error_bad_value);
|
||
return FALSE;
|
||
}
|
||
howto = elf_howto_table + indx;
|
||
|
||
r_symndx = ELF32_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 = (sec->output_section->vma
|
||
+ sec->output_offset
|
||
+ sym->st_value);
|
||
st_size = sym->st_size;
|
||
|
||
if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
|
||
&& ((sec->flags & SEC_MERGE) != 0
|
||
|| (bfd_link_relocatable (info)
|
||
&& sec->output_offset != 0)))
|
||
{
|
||
bfd_vma addend;
|
||
bfd_byte *where = contents + rel->r_offset;
|
||
|
||
switch (howto->size)
|
||
{
|
||
case 0:
|
||
addend = bfd_get_8 (input_bfd, where);
|
||
if (howto->pc_relative)
|
||
{
|
||
addend = (addend ^ 0x80) - 0x80;
|
||
addend += 1;
|
||
}
|
||
break;
|
||
case 1:
|
||
addend = bfd_get_16 (input_bfd, where);
|
||
if (howto->pc_relative)
|
||
{
|
||
addend = (addend ^ 0x8000) - 0x8000;
|
||
addend += 2;
|
||
}
|
||
break;
|
||
case 2:
|
||
addend = bfd_get_32 (input_bfd, where);
|
||
if (howto->pc_relative)
|
||
{
|
||
addend = (addend ^ 0x80000000) - 0x80000000;
|
||
addend += 4;
|
||
}
|
||
break;
|
||
default:
|
||
abort ();
|
||
}
|
||
|
||
if (bfd_link_relocatable (info))
|
||
addend += sec->output_offset;
|
||
else
|
||
{
|
||
asection *msec = sec;
|
||
addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
|
||
addend);
|
||
addend -= relocation;
|
||
addend += msec->output_section->vma + msec->output_offset;
|
||
}
|
||
|
||
switch (howto->size)
|
||
{
|
||
case 0:
|
||
/* FIXME: overflow checks. */
|
||
if (howto->pc_relative)
|
||
addend -= 1;
|
||
bfd_put_8 (input_bfd, addend, where);
|
||
break;
|
||
case 1:
|
||
if (howto->pc_relative)
|
||
addend -= 2;
|
||
bfd_put_16 (input_bfd, addend, where);
|
||
break;
|
||
case 2:
|
||
if (howto->pc_relative)
|
||
addend -= 4;
|
||
bfd_put_32 (input_bfd, addend, where);
|
||
break;
|
||
}
|
||
}
|
||
else if (!bfd_link_relocatable (info)
|
||
&& ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
|
||
{
|
||
/* Relocate against local STT_GNU_IFUNC symbol. */
|
||
h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
|
||
FALSE);
|
||
if (h == NULL)
|
||
abort ();
|
||
|
||
/* Set STT_GNU_IFUNC symbol value. */
|
||
h->root.u.def.value = sym->st_value;
|
||
h->root.u.def.section = sec;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
bfd_boolean warned ATTRIBUTE_UNUSED;
|
||
bfd_boolean ignored ATTRIBUTE_UNUSED;
|
||
|
||
RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
|
||
r_symndx, symtab_hdr, sym_hashes,
|
||
h, sec, relocation,
|
||
unresolved_reloc, warned, ignored);
|
||
st_size = h->size;
|
||
}
|
||
|
||
if (sec != NULL && discarded_section (sec))
|
||
{
|
||
_bfd_clear_contents (howto, input_bfd, input_section,
|
||
contents + rel->r_offset);
|
||
wrel->r_offset = rel->r_offset;
|
||
wrel->r_info = 0;
|
||
wrel->r_addend = 0;
|
||
|
||
/* For ld -r, remove relocations in debug sections against
|
||
sections defined in discarded sections. Not done for
|
||
eh_frame editing code expects to be present. */
|
||
if (bfd_link_relocatable (info)
|
||
&& (input_section->flags & SEC_DEBUGGING))
|
||
wrel--;
|
||
|
||
continue;
|
||
}
|
||
|
||
if (bfd_link_relocatable (info))
|
||
{
|
||
if (wrel != rel)
|
||
*wrel = *rel;
|
||
continue;
|
||
}
|
||
|
||
/* Since STT_GNU_IFUNC symbol must go through PLT, we handle
|
||
it here if it is defined in a non-shared object. */
|
||
if (h != NULL
|
||
&& h->type == STT_GNU_IFUNC
|
||
&& h->def_regular)
|
||
{
|
||
asection *plt, *gotplt, *base_got;
|
||
bfd_vma plt_index;
|
||
const char *name;
|
||
|
||
if ((input_section->flags & SEC_ALLOC) == 0)
|
||
{
|
||
/* 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 ((input_section->flags & SEC_DEBUGGING) != 0)
|
||
continue;
|
||
abort ();
|
||
}
|
||
else if (h->plt.offset == (bfd_vma) -1)
|
||
abort ();
|
||
|
||
/* STT_GNU_IFUNC symbol must go through PLT. */
|
||
if (htab->elf.splt != NULL)
|
||
{
|
||
plt = htab->elf.splt;
|
||
gotplt = htab->elf.sgotplt;
|
||
}
|
||
else
|
||
{
|
||
plt = htab->elf.iplt;
|
||
gotplt = htab->elf.igotplt;
|
||
}
|
||
|
||
relocation = (plt->output_section->vma
|
||
+ plt->output_offset + h->plt.offset);
|
||
|
||
switch (r_type)
|
||
{
|
||
default:
|
||
if (h->root.root.string)
|
||
name = h->root.root.string;
|
||
else
|
||
name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
|
||
NULL);
|
||
(*_bfd_error_handler)
|
||
(_("%B: relocation %s against STT_GNU_IFUNC "
|
||
"symbol `%s' isn't handled by %s"), input_bfd,
|
||
elf_howto_table[r_type].name,
|
||
name, __FUNCTION__);
|
||
bfd_set_error (bfd_error_bad_value);
|
||
return FALSE;
|
||
|
||
case R_386_32:
|
||
/* Generate dynamic relcoation only when there is a
|
||
non-GOT reference in a shared object. */
|
||
if (bfd_link_pic (info) && h->non_got_ref)
|
||
{
|
||
Elf_Internal_Rela outrel;
|
||
asection *sreloc;
|
||
bfd_vma offset;
|
||
|
||
/* Need a dynamic relocation to get the real function
|
||
adddress. */
|
||
offset = _bfd_elf_section_offset (output_bfd,
|
||
info,
|
||
input_section,
|
||
rel->r_offset);
|
||
if (offset == (bfd_vma) -1
|
||
|| offset == (bfd_vma) -2)
|
||
abort ();
|
||
|
||
outrel.r_offset = (input_section->output_section->vma
|
||
+ input_section->output_offset
|
||
+ offset);
|
||
|
||
if (h->dynindx == -1
|
||
|| h->forced_local
|
||
|| bfd_link_executable (info))
|
||
{
|
||
/* This symbol is resolved locally. */
|
||
outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
|
||
bfd_put_32 (output_bfd,
|
||
(h->root.u.def.value
|
||
+ h->root.u.def.section->output_section->vma
|
||
+ h->root.u.def.section->output_offset),
|
||
contents + offset);
|
||
}
|
||
else
|
||
outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
|
||
|
||
sreloc = htab->elf.irelifunc;
|
||
elf_append_rel (output_bfd, sreloc, &outrel);
|
||
|
||
/* 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. For an
|
||
internal symbol, we have updated addend. */
|
||
continue;
|
||
}
|
||
/* FALLTHROUGH */
|
||
case R_386_PC32:
|
||
case R_386_PLT32:
|
||
goto do_relocation;
|
||
|
||
case R_386_GOT32:
|
||
case R_386_GOT32X:
|
||
base_got = htab->elf.sgot;
|
||
off = h->got.offset;
|
||
|
||
if (base_got == NULL)
|
||
abort ();
|
||
|
||
if (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. */
|
||
|
||
if (htab->elf.splt != NULL)
|
||
{
|
||
plt_index = h->plt.offset / plt_entry_size - 1;
|
||
off = (plt_index + 3) * 4;
|
||
base_got = htab->elf.sgotplt;
|
||
}
|
||
else
|
||
{
|
||
plt_index = h->plt.offset / plt_entry_size;
|
||
off = plt_index * 4;
|
||
base_got = htab->elf.igotplt;
|
||
}
|
||
|
||
if (h->dynindx == -1
|
||
|| h->forced_local
|
||
|| info->symbolic)
|
||
{
|
||
/* This references the local defitionion. 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_32 (output_bfd, relocation,
|
||
base_got->contents + off);
|
||
h->got.offset |= 1;
|
||
}
|
||
}
|
||
|
||
relocation = off;
|
||
|
||
/* Adjust for static executables. */
|
||
if (htab->elf.splt == NULL)
|
||
relocation += gotplt->output_offset;
|
||
}
|
||
else
|
||
{
|
||
relocation = (base_got->output_section->vma
|
||
+ base_got->output_offset + off
|
||
- gotplt->output_section->vma
|
||
- gotplt->output_offset);
|
||
/* Adjust for static executables. */
|
||
if (htab->elf.splt == NULL)
|
||
relocation += gotplt->output_offset;
|
||
}
|
||
|
||
goto do_relocation;
|
||
|
||
case R_386_GOTOFF:
|
||
relocation -= (gotplt->output_section->vma
|
||
+ gotplt->output_offset);
|
||
goto do_relocation;
|
||
}
|
||
}
|
||
|
||
eh = (struct elf_i386_link_hash_entry *) h;
|
||
switch (r_type)
|
||
{
|
||
case R_386_GOT32X:
|
||
/* Avoid optimizing _DYNAMIC since ld.so may use its
|
||
link-time address. */
|
||
if (h == htab->elf.hdynamic)
|
||
goto r_386_got32;
|
||
|
||
if (bfd_link_pic (info))
|
||
{
|
||
/* It is OK to convert mov to lea and convert indirect
|
||
branch to direct branch. It is OK to convert adc,
|
||
add, and, cmp, or, sbb, sub, test, xor only when PIC
|
||
is false. */
|
||
unsigned int opcode, addend;
|
||
addend = bfd_get_32 (input_bfd, contents + rel->r_offset);
|
||
if (addend != 0)
|
||
goto r_386_got32;
|
||
opcode = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
|
||
if (opcode != 0x8b && opcode != 0xff)
|
||
goto r_386_got32;
|
||
}
|
||
|
||
/* Resolve "mov GOT[(%reg)], %reg",
|
||
"call/jmp *GOT[(%reg)]", "test %reg, foo@GOT[(%reg)]"
|
||
and "binop foo@GOT[(%reg)], %reg". */
|
||
if (h == NULL
|
||
|| (h->plt.offset == (bfd_vma) -1
|
||
&& h->got.offset == (bfd_vma) -1)
|
||
|| htab->elf.sgotplt == NULL)
|
||
abort ();
|
||
|
||
offplt = (htab->elf.sgotplt->output_section->vma
|
||
+ htab->elf.sgotplt->output_offset);
|
||
|
||
/* It is relative to .got.plt section. */
|
||
if (h->got.offset != (bfd_vma) -1)
|
||
/* Use GOT entry. */
|
||
relocation = (htab->elf.sgot->output_section->vma
|
||
+ htab->elf.sgot->output_offset
|
||
+ h->got.offset - offplt);
|
||
else
|
||
/* Use GOTPLT entry. */
|
||
relocation = (h->plt.offset / plt_entry_size - 1 + 3) * 4;
|
||
|
||
if (!bfd_link_pic (info))
|
||
{
|
||
/* If not PIC, add the .got.plt section address for
|
||
baseless addressing. */
|
||
unsigned int modrm;
|
||
modrm = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
|
||
if ((modrm & 0xc7) == 0x5)
|
||
relocation += offplt;
|
||
}
|
||
|
||
unresolved_reloc = FALSE;
|
||
break;
|
||
|
||
case R_386_GOT32:
|
||
r_386_got32:
|
||
/* Relocation is to the entry for this symbol in the global
|
||
offset table. */
|
||
if (htab->elf.sgot == NULL)
|
||
abort ();
|
||
|
||
if (h != NULL)
|
||
{
|
||
bfd_boolean dyn;
|
||
|
||
off = h->got.offset;
|
||
dyn = htab->elf.dynamic_sections_created;
|
||
if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
|
||
bfd_link_pic (info),
|
||
h)
|
||
|| (bfd_link_pic (info)
|
||
&& 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 4, we use the
|
||
least significant bit to record whether we have
|
||
initialized it already.
|
||
|
||
When doing a dynamic link, we create a .rel.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_32 (output_bfd, relocation,
|
||
htab->elf.sgot->contents + off);
|
||
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 4. 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_32 (output_bfd, relocation,
|
||
htab->elf.sgot->contents + off);
|
||
|
||
if (bfd_link_pic (info))
|
||
{
|
||
asection *s;
|
||
Elf_Internal_Rela outrel;
|
||
|
||
s = htab->elf.srelgot;
|
||
if (s == NULL)
|
||
abort ();
|
||
|
||
outrel.r_offset = (htab->elf.sgot->output_section->vma
|
||
+ htab->elf.sgot->output_offset
|
||
+ off);
|
||
outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
|
||
elf_append_rel (output_bfd, s, &outrel);
|
||
}
|
||
|
||
local_got_offsets[r_symndx] |= 1;
|
||
}
|
||
}
|
||
|
||
if (off >= (bfd_vma) -2)
|
||
abort ();
|
||
|
||
relocation = htab->elf.sgot->output_section->vma
|
||
+ htab->elf.sgot->output_offset + off
|
||
- htab->elf.sgotplt->output_section->vma
|
||
- htab->elf.sgotplt->output_offset;
|
||
break;
|
||
|
||
case R_386_GOTOFF:
|
||
/* Relocation is relative to the start of the global offset
|
||
table. */
|
||
|
||
/* Check to make sure it isn't a protected function or data
|
||
symbol for shared library since it may not be local when
|
||
used as function address or with copy relocation. We also
|
||
need to make sure that a symbol is referenced locally. */
|
||
if (!bfd_link_executable (info) && h)
|
||
{
|
||
if (!h->def_regular)
|
||
{
|
||
const char *v;
|
||
|
||
switch (ELF_ST_VISIBILITY (h->other))
|
||
{
|
||
case STV_HIDDEN:
|
||
v = _("hidden symbol");
|
||
break;
|
||
case STV_INTERNAL:
|
||
v = _("internal symbol");
|
||
break;
|
||
case STV_PROTECTED:
|
||
v = _("protected symbol");
|
||
break;
|
||
default:
|
||
v = _("symbol");
|
||
break;
|
||
}
|
||
|
||
(*_bfd_error_handler)
|
||
(_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
|
||
input_bfd, v, h->root.root.string);
|
||
bfd_set_error (bfd_error_bad_value);
|
||
return FALSE;
|
||
}
|
||
else if (!SYMBOL_REFERENCES_LOCAL (info, h)
|
||
&& (h->type == STT_FUNC
|
||
|| h->type == STT_OBJECT)
|
||
&& ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%B: relocation R_386_GOTOFF against protected %s `%s' can not be used when making a shared object"),
|
||
input_bfd,
|
||
h->type == STT_FUNC ? "function" : "data",
|
||
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->elf.sgotplt->output_section->vma
|
||
+ htab->elf.sgotplt->output_offset;
|
||
break;
|
||
|
||
case R_386_GOTPC:
|
||
/* Use global offset table as symbol value. */
|
||
relocation = htab->elf.sgotplt->output_section->vma
|
||
+ htab->elf.sgotplt->output_offset;
|
||
unresolved_reloc = FALSE;
|
||
break;
|
||
|
||
case R_386_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
|
||
&& eh->plt_got.offset == (bfd_vma) -1)
|
||
|| htab->elf.splt == NULL)
|
||
{
|
||
/* We didn't make a PLT entry for this symbol. This
|
||
happens when statically linking PIC code, or when
|
||
using -Bsymbolic. */
|
||
break;
|
||
}
|
||
|
||
if (h->plt.offset != (bfd_vma) -1)
|
||
{
|
||
resolved_plt = htab->elf.splt;
|
||
plt_offset = h->plt.offset;
|
||
}
|
||
else
|
||
{
|
||
resolved_plt = htab->plt_got;
|
||
plt_offset = eh->plt_got.offset;
|
||
}
|
||
|
||
relocation = (resolved_plt->output_section->vma
|
||
+ resolved_plt->output_offset
|
||
+ plt_offset);
|
||
unresolved_reloc = FALSE;
|
||
break;
|
||
|
||
case R_386_SIZE32:
|
||
/* Set to symbol size. */
|
||
relocation = st_size;
|
||
/* Fall through. */
|
||
|
||
case R_386_32:
|
||
case R_386_PC32:
|
||
if ((input_section->flags & SEC_ALLOC) == 0
|
||
|| is_vxworks_tls)
|
||
break;
|
||
|
||
/* Copy dynamic function pointer relocations. */
|
||
if ((bfd_link_pic (info)
|
||
&& (h == NULL
|
||
|| ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
|
||
|| h->root.type != bfd_link_hash_undefweak)
|
||
&& ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
|
||
|| !SYMBOL_CALLS_LOCAL (info, h)))
|
||
|| (ELIMINATE_COPY_RELOCS
|
||
&& !bfd_link_pic (info)
|
||
&& h != NULL
|
||
&& h->dynindx != -1
|
||
&& (!h->non_got_ref || eh->func_pointer_refcount > 0)
|
||
&& ((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_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);
|
||
else if (h != NULL
|
||
&& h->dynindx != -1
|
||
&& (r_type == R_386_PC32
|
||
|| !bfd_link_pic (info)
|
||
|| !SYMBOLIC_BIND (info, h)
|
||
|| !h->def_regular))
|
||
outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
|
||
else
|
||
{
|
||
/* This symbol is local, or marked to become local. */
|
||
relocate = TRUE;
|
||
outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
|
||
}
|
||
|
||
sreloc = elf_section_data (input_section)->sreloc;
|
||
|
||
if (sreloc == NULL || sreloc->contents == NULL)
|
||
{
|
||
r = bfd_reloc_notsupported;
|
||
goto check_relocation_error;
|
||
}
|
||
|
||
elf_append_rel (output_bfd, sreloc, &outrel);
|
||
|
||
/* 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_386_TLS_IE:
|
||
if (!bfd_link_executable (info))
|
||
{
|
||
Elf_Internal_Rela outrel;
|
||
asection *sreloc;
|
||
|
||
outrel.r_offset = rel->r_offset
|
||
+ input_section->output_section->vma
|
||
+ input_section->output_offset;
|
||
outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
|
||
sreloc = elf_section_data (input_section)->sreloc;
|
||
if (sreloc == NULL)
|
||
abort ();
|
||
elf_append_rel (output_bfd, sreloc, &outrel);
|
||
}
|
||
/* Fall through */
|
||
|
||
case R_386_TLS_GD:
|
||
case R_386_TLS_GOTDESC:
|
||
case R_386_TLS_DESC_CALL:
|
||
case R_386_TLS_IE_32:
|
||
case R_386_TLS_GOTIE:
|
||
tls_type = GOT_UNKNOWN;
|
||
if (h == NULL && local_got_offsets)
|
||
tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
|
||
else if (h != NULL)
|
||
tls_type = elf_i386_hash_entry(h)->tls_type;
|
||
if (tls_type == GOT_TLS_IE)
|
||
tls_type = GOT_TLS_IE_NEG;
|
||
|
||
if (! elf_i386_tls_transition (info, input_bfd,
|
||
input_section, contents,
|
||
symtab_hdr, sym_hashes,
|
||
&r_type, tls_type, rel,
|
||
relend, h, r_symndx))
|
||
return FALSE;
|
||
|
||
if (r_type == R_386_TLS_LE_32)
|
||
{
|
||
BFD_ASSERT (! unresolved_reloc);
|
||
if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
|
||
{
|
||
unsigned int type;
|
||
bfd_vma roff;
|
||
|
||
/* GD->LE transition. */
|
||
type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
|
||
if (type == 0x04)
|
||
{
|
||
/* leal foo(,%reg,1), %eax; call ___tls_get_addr
|
||
Change it into:
|
||
movl %gs:0, %eax; subl $foo@tpoff, %eax
|
||
(6 byte form of subl). */
|
||
memcpy (contents + rel->r_offset - 3,
|
||
"\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
|
||
roff = rel->r_offset + 5;
|
||
}
|
||
else
|
||
{
|
||
/* leal foo(%reg), %eax; call ___tls_get_addr; nop
|
||
Change it into:
|
||
movl %gs:0, %eax; subl $foo@tpoff, %eax
|
||
(6 byte form of subl). */
|
||
memcpy (contents + rel->r_offset - 2,
|
||
"\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
|
||
roff = rel->r_offset + 6;
|
||
}
|
||
bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
|
||
contents + roff);
|
||
/* Skip R_386_PC32/R_386_PLT32. */
|
||
rel++;
|
||
wrel++;
|
||
continue;
|
||
}
|
||
else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
|
||
{
|
||
/* GDesc -> LE transition.
|
||
It's originally something like:
|
||
leal x@tlsdesc(%ebx), %eax
|
||
|
||
leal x@ntpoff, %eax
|
||
|
||
Registers other than %eax may be set up here. */
|
||
|
||
unsigned int val;
|
||
bfd_vma roff;
|
||
|
||
roff = rel->r_offset;
|
||
val = bfd_get_8 (input_bfd, contents + roff - 1);
|
||
|
||
/* Now modify the instruction as appropriate. */
|
||
/* aoliva FIXME: remove the above and xor the byte
|
||
below with 0x86. */
|
||
bfd_put_8 (output_bfd, val ^ 0x86,
|
||
contents + roff - 1);
|
||
bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
|
||
contents + roff);
|
||
continue;
|
||
}
|
||
else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
|
||
{
|
||
/* GDesc -> LE transition.
|
||
It's originally:
|
||
call *(%eax)
|
||
Turn it into:
|
||
xchg %ax,%ax */
|
||
|
||
bfd_vma roff;
|
||
|
||
roff = rel->r_offset;
|
||
bfd_put_8 (output_bfd, 0x66, contents + roff);
|
||
bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
|
||
continue;
|
||
}
|
||
else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
|
||
{
|
||
unsigned int val;
|
||
|
||
/* IE->LE transition:
|
||
Originally it can be one of:
|
||
movl foo, %eax
|
||
movl foo, %reg
|
||
addl foo, %reg
|
||
We change it into:
|
||
movl $foo, %eax
|
||
movl $foo, %reg
|
||
addl $foo, %reg. */
|
||
val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
|
||
if (val == 0xa1)
|
||
{
|
||
/* movl foo, %eax. */
|
||
bfd_put_8 (output_bfd, 0xb8,
|
||
contents + rel->r_offset - 1);
|
||
}
|
||
else
|
||
{
|
||
unsigned int type;
|
||
|
||
type = bfd_get_8 (input_bfd,
|
||
contents + rel->r_offset - 2);
|
||
switch (type)
|
||
{
|
||
case 0x8b:
|
||
/* movl */
|
||
bfd_put_8 (output_bfd, 0xc7,
|
||
contents + rel->r_offset - 2);
|
||
bfd_put_8 (output_bfd,
|
||
0xc0 | ((val >> 3) & 7),
|
||
contents + rel->r_offset - 1);
|
||
break;
|
||
case 0x03:
|
||
/* addl */
|
||
bfd_put_8 (output_bfd, 0x81,
|
||
contents + rel->r_offset - 2);
|
||
bfd_put_8 (output_bfd,
|
||
0xc0 | ((val >> 3) & 7),
|
||
contents + rel->r_offset - 1);
|
||
break;
|
||
default:
|
||
BFD_FAIL ();
|
||
break;
|
||
}
|
||
}
|
||
bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
|
||
contents + rel->r_offset);
|
||
continue;
|
||
}
|
||
else
|
||
{
|
||
unsigned int val, type;
|
||
|
||
/* {IE_32,GOTIE}->LE transition:
|
||
Originally it can be one of:
|
||
subl foo(%reg1), %reg2
|
||
movl foo(%reg1), %reg2
|
||
addl foo(%reg1), %reg2
|
||
We change it into:
|
||
subl $foo, %reg2
|
||
movl $foo, %reg2 (6 byte form)
|
||
addl $foo, %reg2. */
|
||
type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
|
||
val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
|
||
if (type == 0x8b)
|
||
{
|
||
/* movl */
|
||
bfd_put_8 (output_bfd, 0xc7,
|
||
contents + rel->r_offset - 2);
|
||
bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
|
||
contents + rel->r_offset - 1);
|
||
}
|
||
else if (type == 0x2b)
|
||
{
|
||
/* subl */
|
||
bfd_put_8 (output_bfd, 0x81,
|
||
contents + rel->r_offset - 2);
|
||
bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
|
||
contents + rel->r_offset - 1);
|
||
}
|
||
else if (type == 0x03)
|
||
{
|
||
/* addl */
|
||
bfd_put_8 (output_bfd, 0x81,
|
||
contents + rel->r_offset - 2);
|
||
bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
|
||
contents + rel->r_offset - 1);
|
||
}
|
||
else
|
||
BFD_FAIL ();
|
||
if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
|
||
bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
|
||
contents + rel->r_offset);
|
||
else
|
||
bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
|
||
contents + rel->r_offset);
|
||
continue;
|
||
}
|
||
}
|
||
|
||
if (htab->elf.sgot == NULL)
|
||
abort ();
|
||
|
||
if (h != NULL)
|
||
{
|
||
off = h->got.offset;
|
||
offplt = elf_i386_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;
|
||
int dr_type;
|
||
asection *sreloc;
|
||
|
||
if (htab->elf.srelgot == NULL)
|
||
abort ();
|
||
|
||
indx = h && h->dynindx != -1 ? h->dynindx : 0;
|
||
|
||
if (GOT_TLS_GDESC_P (tls_type))
|
||
{
|
||
bfd_byte *loc;
|
||
outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
|
||
BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
|
||
<= htab->elf.sgotplt->size);
|
||
outrel.r_offset = (htab->elf.sgotplt->output_section->vma
|
||
+ htab->elf.sgotplt->output_offset
|
||
+ offplt
|
||
+ htab->sgotplt_jump_table_size);
|
||
sreloc = htab->elf.srelplt;
|
||
loc = sreloc->contents;
|
||
loc += (htab->next_tls_desc_index++
|
||
* sizeof (Elf32_External_Rel));
|
||
BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
|
||
<= sreloc->contents + sreloc->size);
|
||
bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
|
||
if (indx == 0)
|
||
{
|
||
BFD_ASSERT (! unresolved_reloc);
|
||
bfd_put_32 (output_bfd,
|
||
relocation - elf_i386_dtpoff_base (info),
|
||
htab->elf.sgotplt->contents + offplt
|
||
+ htab->sgotplt_jump_table_size + 4);
|
||
}
|
||
else
|
||
{
|
||
bfd_put_32 (output_bfd, 0,
|
||
htab->elf.sgotplt->contents + offplt
|
||
+ htab->sgotplt_jump_table_size + 4);
|
||
}
|
||
}
|
||
|
||
sreloc = htab->elf.srelgot;
|
||
|
||
outrel.r_offset = (htab->elf.sgot->output_section->vma
|
||
+ htab->elf.sgot->output_offset + off);
|
||
|
||
if (GOT_TLS_GD_P (tls_type))
|
||
dr_type = R_386_TLS_DTPMOD32;
|
||
else if (GOT_TLS_GDESC_P (tls_type))
|
||
goto dr_done;
|
||
else if (tls_type == GOT_TLS_IE_POS)
|
||
dr_type = R_386_TLS_TPOFF;
|
||
else
|
||
dr_type = R_386_TLS_TPOFF32;
|
||
|
||
if (dr_type == R_386_TLS_TPOFF && indx == 0)
|
||
bfd_put_32 (output_bfd,
|
||
relocation - elf_i386_dtpoff_base (info),
|
||
htab->elf.sgot->contents + off);
|
||
else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
|
||
bfd_put_32 (output_bfd,
|
||
elf_i386_dtpoff_base (info) - relocation,
|
||
htab->elf.sgot->contents + off);
|
||
else if (dr_type != R_386_TLS_DESC)
|
||
bfd_put_32 (output_bfd, 0,
|
||
htab->elf.sgot->contents + off);
|
||
outrel.r_info = ELF32_R_INFO (indx, dr_type);
|
||
|
||
elf_append_rel (output_bfd, sreloc, &outrel);
|
||
|
||
if (GOT_TLS_GD_P (tls_type))
|
||
{
|
||
if (indx == 0)
|
||
{
|
||
BFD_ASSERT (! unresolved_reloc);
|
||
bfd_put_32 (output_bfd,
|
||
relocation - elf_i386_dtpoff_base (info),
|
||
htab->elf.sgot->contents + off + 4);
|
||
}
|
||
else
|
||
{
|
||
bfd_put_32 (output_bfd, 0,
|
||
htab->elf.sgot->contents + off + 4);
|
||
outrel.r_info = ELF32_R_INFO (indx,
|
||
R_386_TLS_DTPOFF32);
|
||
outrel.r_offset += 4;
|
||
elf_append_rel (output_bfd, sreloc, &outrel);
|
||
}
|
||
}
|
||
else if (tls_type == GOT_TLS_IE_BOTH)
|
||
{
|
||
bfd_put_32 (output_bfd,
|
||
(indx == 0
|
||
? relocation - elf_i386_dtpoff_base (info)
|
||
: 0),
|
||
htab->elf.sgot->contents + off + 4);
|
||
outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
|
||
outrel.r_offset += 4;
|
||
elf_append_rel (output_bfd, sreloc, &outrel);
|
||
}
|
||
|
||
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 == R_386_TLS_GOTDESC
|
||
|| r_type == R_386_TLS_DESC_CALL)
|
||
{
|
||
relocation = htab->sgotplt_jump_table_size + offplt;
|
||
unresolved_reloc = FALSE;
|
||
}
|
||
else if (r_type == ELF32_R_TYPE (rel->r_info))
|
||
{
|
||
bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
|
||
+ htab->elf.sgotplt->output_offset;
|
||
relocation = htab->elf.sgot->output_section->vma
|
||
+ htab->elf.sgot->output_offset + off - g_o_t;
|
||
if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
|
||
&& tls_type == GOT_TLS_IE_BOTH)
|
||
relocation += 4;
|
||
if (r_type == R_386_TLS_IE)
|
||
relocation += g_o_t;
|
||
unresolved_reloc = FALSE;
|
||
}
|
||
else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
|
||
{
|
||
unsigned int val, type;
|
||
bfd_vma roff;
|
||
|
||
/* GD->IE transition. */
|
||
type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
|
||
val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
|
||
if (type == 0x04)
|
||
{
|
||
/* leal foo(,%reg,1), %eax; call ___tls_get_addr
|
||
Change it into:
|
||
movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
|
||
val >>= 3;
|
||
roff = rel->r_offset - 3;
|
||
}
|
||
else
|
||
{
|
||
/* leal foo(%reg), %eax; call ___tls_get_addr; nop
|
||
Change it into:
|
||
movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
|
||
roff = rel->r_offset - 2;
|
||
}
|
||
memcpy (contents + roff,
|
||
"\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
|
||
contents[roff + 7] = 0x80 | (val & 7);
|
||
/* If foo is used only with foo@gotntpoff(%reg) and
|
||
foo@indntpoff, but not with foo@gottpoff(%reg), change
|
||
subl $foo@gottpoff(%reg), %eax
|
||
into:
|
||
addl $foo@gotntpoff(%reg), %eax. */
|
||
if (tls_type == GOT_TLS_IE_POS)
|
||
contents[roff + 6] = 0x03;
|
||
bfd_put_32 (output_bfd,
|
||
htab->elf.sgot->output_section->vma
|
||
+ htab->elf.sgot->output_offset + off
|
||
- htab->elf.sgotplt->output_section->vma
|
||
- htab->elf.sgotplt->output_offset,
|
||
contents + roff + 8);
|
||
/* Skip R_386_PLT32. */
|
||
rel++;
|
||
wrel++;
|
||
continue;
|
||
}
|
||
else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
|
||
{
|
||
/* GDesc -> IE transition.
|
||
It's originally something like:
|
||
leal x@tlsdesc(%ebx), %eax
|
||
|
||
Change it to:
|
||
movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
|
||
or:
|
||
movl x@gottpoff(%ebx), %eax # before negl %eax
|
||
|
||
Registers other than %eax may be set up here. */
|
||
|
||
bfd_vma roff;
|
||
|
||
/* First, make sure it's a leal adding ebx to a 32-bit
|
||
offset into any register, although it's probably
|
||
almost always going to be eax. */
|
||
roff = rel->r_offset;
|
||
|
||
/* Now modify the instruction as appropriate. */
|
||
/* To turn a leal into a movl in the form we use it, it
|
||
suffices to change the first byte from 0x8d to 0x8b.
|
||
aoliva FIXME: should we decide to keep the leal, all
|
||
we have to do is remove the statement below, and
|
||
adjust the relaxation of R_386_TLS_DESC_CALL. */
|
||
bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
|
||
|
||
if (tls_type == GOT_TLS_IE_BOTH)
|
||
off += 4;
|
||
|
||
bfd_put_32 (output_bfd,
|
||
htab->elf.sgot->output_section->vma
|
||
+ htab->elf.sgot->output_offset + off
|
||
- htab->elf.sgotplt->output_section->vma
|
||
- htab->elf.sgotplt->output_offset,
|
||
contents + roff);
|
||
continue;
|
||
}
|
||
else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
|
||
{
|
||
/* GDesc -> IE transition.
|
||
It's originally:
|
||
call *(%eax)
|
||
|
||
Change it to:
|
||
xchg %ax,%ax
|
||
or
|
||
negl %eax
|
||
depending on how we transformed the TLS_GOTDESC above.
|
||
*/
|
||
|
||
bfd_vma roff;
|
||
|
||
roff = rel->r_offset;
|
||
|
||
/* Now modify the instruction as appropriate. */
|
||
if (tls_type != GOT_TLS_IE_NEG)
|
||
{
|
||
/* xchg %ax,%ax */
|
||
bfd_put_8 (output_bfd, 0x66, contents + roff);
|
||
bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
|
||
}
|
||
else
|
||
{
|
||
/* negl %eax */
|
||
bfd_put_8 (output_bfd, 0xf7, contents + roff);
|
||
bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
|
||
}
|
||
|
||
continue;
|
||
}
|
||
else
|
||
BFD_ASSERT (FALSE);
|
||
break;
|
||
|
||
case R_386_TLS_LDM:
|
||
if (! elf_i386_tls_transition (info, input_bfd,
|
||
input_section, contents,
|
||
symtab_hdr, sym_hashes,
|
||
&r_type, GOT_UNKNOWN, rel,
|
||
relend, h, r_symndx))
|
||
return FALSE;
|
||
|
||
if (r_type != R_386_TLS_LDM)
|
||
{
|
||
/* LD->LE transition:
|
||
leal foo(%reg), %eax; call ___tls_get_addr.
|
||
We change it into:
|
||
movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
|
||
BFD_ASSERT (r_type == R_386_TLS_LE_32);
|
||
memcpy (contents + rel->r_offset - 2,
|
||
"\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
|
||
/* Skip R_386_PC32/R_386_PLT32. */
|
||
rel++;
|
||
wrel++;
|
||
continue;
|
||
}
|
||
|
||
if (htab->elf.sgot == NULL)
|
||
abort ();
|
||
|
||
off = htab->tls_ldm_got.offset;
|
||
if (off & 1)
|
||
off &= ~1;
|
||
else
|
||
{
|
||
Elf_Internal_Rela outrel;
|
||
|
||
if (htab->elf.srelgot == NULL)
|
||
abort ();
|
||
|
||
outrel.r_offset = (htab->elf.sgot->output_section->vma
|
||
+ htab->elf.sgot->output_offset + off);
|
||
|
||
bfd_put_32 (output_bfd, 0,
|
||
htab->elf.sgot->contents + off);
|
||
bfd_put_32 (output_bfd, 0,
|
||
htab->elf.sgot->contents + off + 4);
|
||
outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
|
||
elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
|
||
htab->tls_ldm_got.offset |= 1;
|
||
}
|
||
relocation = htab->elf.sgot->output_section->vma
|
||
+ htab->elf.sgot->output_offset + off
|
||
- htab->elf.sgotplt->output_section->vma
|
||
- htab->elf.sgotplt->output_offset;
|
||
unresolved_reloc = FALSE;
|
||
break;
|
||
|
||
case R_386_TLS_LDO_32:
|
||
if (!bfd_link_executable (info)
|
||
|| (input_section->flags & SEC_CODE) == 0)
|
||
relocation -= elf_i386_dtpoff_base (info);
|
||
else
|
||
/* When converting LDO to LE, we must negate. */
|
||
relocation = -elf_i386_tpoff (info, relocation);
|
||
break;
|
||
|
||
case R_386_TLS_LE_32:
|
||
case R_386_TLS_LE:
|
||
if (!bfd_link_executable (info))
|
||
{
|
||
Elf_Internal_Rela outrel;
|
||
asection *sreloc;
|
||
|
||
outrel.r_offset = rel->r_offset
|
||
+ input_section->output_section->vma
|
||
+ input_section->output_offset;
|
||
if (h != NULL && h->dynindx != -1)
|
||
indx = h->dynindx;
|
||
else
|
||
indx = 0;
|
||
if (r_type == R_386_TLS_LE_32)
|
||
outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
|
||
else
|
||
outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
|
||
sreloc = elf_section_data (input_section)->sreloc;
|
||
if (sreloc == NULL)
|
||
abort ();
|
||
elf_append_rel (output_bfd, sreloc, &outrel);
|
||
if (indx)
|
||
continue;
|
||
else if (r_type == R_386_TLS_LE_32)
|
||
relocation = elf_i386_dtpoff_base (info) - relocation;
|
||
else
|
||
relocation -= elf_i386_dtpoff_base (info);
|
||
}
|
||
else if (r_type == R_386_TLS_LE_32)
|
||
relocation = elf_i386_tpoff (info, relocation);
|
||
else
|
||
relocation = -elf_i386_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_elf_section_offset (output_bfd, info, input_section,
|
||
rel->r_offset) != (bfd_vma) -1)
|
||
{
|
||
(*_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);
|
||
return FALSE;
|
||
}
|
||
|
||
do_relocation:
|
||
r = _bfd_final_link_relocate (howto, input_bfd, input_section,
|
||
contents, rel->r_offset,
|
||
relocation, 0);
|
||
|
||
check_relocation_error:
|
||
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;
|
||
}
|
||
}
|
||
|
||
if (wrel != rel)
|
||
*wrel = *rel;
|
||
}
|
||
|
||
if (wrel != rel)
|
||
{
|
||
Elf_Internal_Shdr *rel_hdr;
|
||
size_t deleted = rel - wrel;
|
||
|
||
rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
|
||
rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
|
||
if (rel_hdr->sh_size == 0)
|
||
{
|
||
/* It is too late to remove an empty reloc section. Leave
|
||
one NONE reloc.
|
||
??? What is wrong with an empty section??? */
|
||
rel_hdr->sh_size = rel_hdr->sh_entsize;
|
||
deleted -= 1;
|
||
}
|
||
rel_hdr = _bfd_elf_single_rel_hdr (input_section);
|
||
rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
|
||
input_section->reloc_count -= deleted;
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Finish up dynamic symbol handling. We set the contents of various
|
||
dynamic sections here. */
|
||
|
||
static bfd_boolean
|
||
elf_i386_finish_dynamic_symbol (bfd *output_bfd,
|
||
struct bfd_link_info *info,
|
||
struct elf_link_hash_entry *h,
|
||
Elf_Internal_Sym *sym)
|
||
{
|
||
struct elf_i386_link_hash_table *htab;
|
||
unsigned plt_entry_size;
|
||
const struct elf_i386_backend_data *abed;
|
||
struct elf_i386_link_hash_entry *eh;
|
||
|
||
htab = elf_i386_hash_table (info);
|
||
if (htab == NULL)
|
||
return FALSE;
|
||
|
||
abed = get_elf_i386_backend_data (output_bfd);
|
||
plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
|
||
|
||
eh = (struct elf_i386_link_hash_entry *) h;
|
||
|
||
if (h->plt.offset != (bfd_vma) -1)
|
||
{
|
||
bfd_vma plt_index;
|
||
bfd_vma got_offset;
|
||
Elf_Internal_Rela rel;
|
||
bfd_byte *loc;
|
||
asection *plt, *gotplt, *relplt;
|
||
|
||
/* When building a static executable, use .iplt, .igot.plt and
|
||
.rel.iplt sections for STT_GNU_IFUNC symbols. */
|
||
if (htab->elf.splt != NULL)
|
||
{
|
||
plt = htab->elf.splt;
|
||
gotplt = htab->elf.sgotplt;
|
||
relplt = htab->elf.srelplt;
|
||
}
|
||
else
|
||
{
|
||
plt = htab->elf.iplt;
|
||
gotplt = htab->elf.igotplt;
|
||
relplt = htab->elf.irelplt;
|
||
}
|
||
|
||
/* This symbol has an entry in the procedure linkage table. Set
|
||
it up. */
|
||
|
||
if ((h->dynindx == -1
|
||
&& !((h->forced_local || bfd_link_executable (info))
|
||
&& h->def_regular
|
||
&& h->type == STT_GNU_IFUNC))
|
||
|| plt == NULL
|
||
|| gotplt == NULL
|
||
|| relplt == 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.
|
||
|
||
Get the offset into the .got table of the entry that
|
||
corresponds to this function. Each .got entry is 4 bytes.
|
||
The first three are reserved.
|
||
|
||
For static executables, we don't reserve anything. */
|
||
|
||
if (plt == htab->elf.splt)
|
||
{
|
||
got_offset = h->plt.offset / plt_entry_size - 1;
|
||
got_offset = (got_offset + 3) * 4;
|
||
}
|
||
else
|
||
{
|
||
got_offset = h->plt.offset / plt_entry_size;
|
||
got_offset = got_offset * 4;
|
||
}
|
||
|
||
/* Fill in the entry in the procedure linkage table. */
|
||
if (! bfd_link_pic (info))
|
||
{
|
||
memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
|
||
abed->plt->plt_entry_size);
|
||
bfd_put_32 (output_bfd,
|
||
(gotplt->output_section->vma
|
||
+ gotplt->output_offset
|
||
+ got_offset),
|
||
plt->contents + h->plt.offset
|
||
+ abed->plt->plt_got_offset);
|
||
|
||
if (abed->is_vxworks)
|
||
{
|
||
int s, k, reloc_index;
|
||
|
||
/* Create the R_386_32 relocation referencing the GOT
|
||
for this PLT entry. */
|
||
|
||
/* S: Current slot number (zero-based). */
|
||
s = ((h->plt.offset - abed->plt->plt_entry_size)
|
||
/ abed->plt->plt_entry_size);
|
||
/* K: Number of relocations for PLTResolve. */
|
||
if (bfd_link_pic (info))
|
||
k = PLTRESOLVE_RELOCS_SHLIB;
|
||
else
|
||
k = PLTRESOLVE_RELOCS;
|
||
/* Skip the PLTresolve relocations, and the relocations for
|
||
the other PLT slots. */
|
||
reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
|
||
loc = (htab->srelplt2->contents + reloc_index
|
||
* sizeof (Elf32_External_Rel));
|
||
|
||
rel.r_offset = (htab->elf.splt->output_section->vma
|
||
+ htab->elf.splt->output_offset
|
||
+ h->plt.offset + 2),
|
||
rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
|
||
bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
|
||
|
||
/* Create the R_386_32 relocation referencing the beginning of
|
||
the PLT for this GOT entry. */
|
||
rel.r_offset = (htab->elf.sgotplt->output_section->vma
|
||
+ htab->elf.sgotplt->output_offset
|
||
+ got_offset);
|
||
rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
|
||
bfd_elf32_swap_reloc_out (output_bfd, &rel,
|
||
loc + sizeof (Elf32_External_Rel));
|
||
}
|
||
}
|
||
else
|
||
{
|
||
memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
|
||
abed->plt->plt_entry_size);
|
||
bfd_put_32 (output_bfd, got_offset,
|
||
plt->contents + h->plt.offset
|
||
+ abed->plt->plt_got_offset);
|
||
}
|
||
|
||
/* Fill in the entry in the global offset table. */
|
||
bfd_put_32 (output_bfd,
|
||
(plt->output_section->vma
|
||
+ plt->output_offset
|
||
+ h->plt.offset
|
||
+ abed->plt->plt_lazy_offset),
|
||
gotplt->contents + got_offset);
|
||
|
||
/* Fill in the entry in the .rel.plt section. */
|
||
rel.r_offset = (gotplt->output_section->vma
|
||
+ gotplt->output_offset
|
||
+ got_offset);
|
||
if (h->dynindx == -1
|
||
|| ((bfd_link_executable (info)
|
||
|| ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
|
||
&& h->def_regular
|
||
&& h->type == STT_GNU_IFUNC))
|
||
{
|
||
/* If an STT_GNU_IFUNC symbol is locally defined, generate
|
||
R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
|
||
in the .got.plt section. */
|
||
bfd_put_32 (output_bfd,
|
||
(h->root.u.def.value
|
||
+ h->root.u.def.section->output_section->vma
|
||
+ h->root.u.def.section->output_offset),
|
||
gotplt->contents + got_offset);
|
||
rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
|
||
/* R_386_IRELATIVE comes last. */
|
||
plt_index = htab->next_irelative_index--;
|
||
}
|
||
else
|
||
{
|
||
rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
|
||
plt_index = htab->next_jump_slot_index++;
|
||
}
|
||
loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
|
||
bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
|
||
|
||
/* Don't fill PLT entry for static executables. */
|
||
if (plt == htab->elf.splt)
|
||
{
|
||
bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
|
||
plt->contents + h->plt.offset
|
||
+ abed->plt->plt_reloc_offset);
|
||
bfd_put_32 (output_bfd, - (h->plt.offset
|
||
+ abed->plt->plt_plt_offset + 4),
|
||
plt->contents + h->plt.offset
|
||
+ abed->plt->plt_plt_offset);
|
||
}
|
||
}
|
||
else if (eh->plt_got.offset != (bfd_vma) -1)
|
||
{
|
||
bfd_vma got_offset, plt_offset;
|
||
asection *plt, *got, *gotplt;
|
||
const bfd_byte *got_plt_entry;
|
||
|
||
/* Offset of displacement of the indirect jump. */
|
||
bfd_vma plt_got_offset = 2;
|
||
|
||
/* Set the entry in the GOT procedure linkage table. */
|
||
plt = htab->plt_got;
|
||
got = htab->elf.sgot;
|
||
gotplt = htab->elf.sgotplt;
|
||
got_offset = h->got.offset;
|
||
|
||
if (got_offset == (bfd_vma) -1
|
||
|| plt == NULL
|
||
|| got == NULL
|
||
|| gotplt == NULL)
|
||
abort ();
|
||
|
||
/* Fill in the entry in the GOT procedure linkage table. */
|
||
if (! bfd_link_pic (info))
|
||
{
|
||
got_plt_entry = elf_i386_got_plt_entry;
|
||
got_offset += got->output_section->vma + got->output_offset;
|
||
}
|
||
else
|
||
{
|
||
got_plt_entry = elf_i386_pic_got_plt_entry;
|
||
got_offset += (got->output_section->vma
|
||
+ got->output_offset
|
||
- gotplt->output_section->vma
|
||
- gotplt->output_offset);
|
||
}
|
||
|
||
plt_offset = eh->plt_got.offset;
|
||
memcpy (plt->contents + plt_offset, got_plt_entry,
|
||
sizeof (elf_i386_got_plt_entry));
|
||
bfd_put_32 (output_bfd, got_offset,
|
||
plt->contents + plt_offset + plt_got_offset);
|
||
}
|
||
|
||
if (!h->def_regular
|
||
&& (h->plt.offset != (bfd_vma) -1
|
||
|| eh->plt_got.offset != (bfd_vma) -1))
|
||
{
|
||
/* 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 (elf_i386_hash_entry(h)->tls_type)
|
||
&& (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
|
||
{
|
||
Elf_Internal_Rela rel;
|
||
|
||
/* This symbol has an entry in the global offset table. Set it
|
||
up. */
|
||
|
||
if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
|
||
abort ();
|
||
|
||
rel.r_offset = (htab->elf.sgot->output_section->vma
|
||
+ htab->elf.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 (h->def_regular
|
||
&& h->type == STT_GNU_IFUNC)
|
||
{
|
||
if (bfd_link_pic (info))
|
||
{
|
||
/* Generate R_386_GLOB_DAT. */
|
||
goto do_glob_dat;
|
||
}
|
||
else
|
||
{
|
||
asection *plt;
|
||
|
||
if (!h->pointer_equality_needed)
|
||
abort ();
|
||
|
||
/* For non-shared object, we can't use .got.plt, which
|
||
contains the real function addres if we need pointer
|
||
equality. We load the GOT entry with the PLT entry. */
|
||
plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
|
||
bfd_put_32 (output_bfd,
|
||
(plt->output_section->vma
|
||
+ plt->output_offset + h->plt.offset),
|
||
htab->elf.sgot->contents + h->got.offset);
|
||
return TRUE;
|
||
}
|
||
}
|
||
else if (bfd_link_pic (info)
|
||
&& SYMBOL_REFERENCES_LOCAL (info, h))
|
||
{
|
||
BFD_ASSERT((h->got.offset & 1) != 0);
|
||
rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
|
||
}
|
||
else
|
||
{
|
||
BFD_ASSERT((h->got.offset & 1) == 0);
|
||
do_glob_dat:
|
||
bfd_put_32 (output_bfd, (bfd_vma) 0,
|
||
htab->elf.sgot->contents + h->got.offset);
|
||
rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
|
||
}
|
||
|
||
elf_append_rel (output_bfd, htab->elf.srelgot, &rel);
|
||
}
|
||
|
||
if (h->needs_copy)
|
||
{
|
||
Elf_Internal_Rela rel;
|
||
|
||
/* 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 ();
|
||
|
||
rel.r_offset = (h->root.u.def.value
|
||
+ h->root.u.def.section->output_section->vma
|
||
+ h->root.u.def.section->output_offset);
|
||
rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
|
||
elf_append_rel (output_bfd, htab->srelbss, &rel);
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Finish up local dynamic symbol handling. We set the contents of
|
||
various dynamic sections here. */
|
||
|
||
static bfd_boolean
|
||
elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
|
||
{
|
||
struct elf_link_hash_entry *h
|
||
= (struct elf_link_hash_entry *) *slot;
|
||
struct bfd_link_info *info
|
||
= (struct bfd_link_info *) inf;
|
||
|
||
return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
|
||
h, NULL);
|
||
}
|
||
|
||
/* 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
|
||
elf_i386_reloc_type_class (const struct bfd_link_info *info,
|
||
const asection *rel_sec ATTRIBUTE_UNUSED,
|
||
const Elf_Internal_Rela *rela)
|
||
{
|
||
bfd *abfd = info->output_bfd;
|
||
const struct elf_backend_data *bed = get_elf_backend_data (abfd);
|
||
struct elf_link_hash_table *htab = elf_hash_table (info);
|
||
unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
|
||
Elf_Internal_Sym sym;
|
||
|
||
if (htab->dynsym == NULL
|
||
|| !bed->s->swap_symbol_in (abfd,
|
||
(htab->dynsym->contents
|
||
+ r_symndx * sizeof (Elf32_External_Sym)),
|
||
0, &sym))
|
||
abort ();
|
||
|
||
/* Check relocation against STT_GNU_IFUNC symbol. */
|
||
if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
|
||
return reloc_class_ifunc;
|
||
|
||
switch (ELF32_R_TYPE (rela->r_info))
|
||
{
|
||
case R_386_RELATIVE:
|
||
return reloc_class_relative;
|
||
case R_386_JUMP_SLOT:
|
||
return reloc_class_plt;
|
||
case R_386_COPY:
|
||
return reloc_class_copy;
|
||
default:
|
||
return reloc_class_normal;
|
||
}
|
||
}
|
||
|
||
/* Finish up the dynamic sections. */
|
||
|
||
static bfd_boolean
|
||
elf_i386_finish_dynamic_sections (bfd *output_bfd,
|
||
struct bfd_link_info *info)
|
||
{
|
||
struct elf_i386_link_hash_table *htab;
|
||
bfd *dynobj;
|
||
asection *sdyn;
|
||
const struct elf_i386_backend_data *abed;
|
||
|
||
htab = elf_i386_hash_table (info);
|
||
if (htab == NULL)
|
||
return FALSE;
|
||
|
||
dynobj = htab->elf.dynobj;
|
||
sdyn = bfd_get_linker_section (dynobj, ".dynamic");
|
||
abed = get_elf_i386_backend_data (output_bfd);
|
||
|
||
if (htab->elf.dynamic_sections_created)
|
||
{
|
||
Elf32_External_Dyn *dyncon, *dynconend;
|
||
|
||
if (sdyn == NULL || htab->elf.sgot == NULL)
|
||
abort ();
|
||
|
||
dyncon = (Elf32_External_Dyn *) sdyn->contents;
|
||
dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
|
||
for (; dyncon < dynconend; dyncon++)
|
||
{
|
||
Elf_Internal_Dyn dyn;
|
||
asection *s;
|
||
|
||
bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
|
||
|
||
switch (dyn.d_tag)
|
||
{
|
||
default:
|
||
if (abed->is_vxworks
|
||
&& elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
|
||
break;
|
||
continue;
|
||
|
||
case DT_PLTGOT:
|
||
s = htab->elf.sgotplt;
|
||
dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
|
||
break;
|
||
|
||
case DT_JMPREL:
|
||
s = htab->elf.srelplt;
|
||
dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
|
||
break;
|
||
|
||
case DT_PLTRELSZ:
|
||
s = htab->elf.srelplt;
|
||
dyn.d_un.d_val = s->size;
|
||
break;
|
||
|
||
case DT_RELSZ:
|
||
/* My reading of the SVR4 ABI indicates that the
|
||
procedure linkage table relocs (DT_JMPREL) should be
|
||
included in the overall relocs (DT_REL). This is
|
||
what Solaris does. However, UnixWare can not handle
|
||
that case. Therefore, we override the DT_RELSZ entry
|
||
here to make it not include the JMPREL relocs. */
|
||
s = htab->elf.srelplt;
|
||
if (s == NULL)
|
||
continue;
|
||
dyn.d_un.d_val -= s->size;
|
||
break;
|
||
|
||
case DT_REL:
|
||
/* We may not be using the standard ELF linker script.
|
||
If .rel.plt is the first .rel section, we adjust
|
||
DT_REL to not include it. */
|
||
s = htab->elf.srelplt;
|
||
if (s == NULL)
|
||
continue;
|
||
if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
|
||
continue;
|
||
dyn.d_un.d_ptr += s->size;
|
||
break;
|
||
}
|
||
|
||
bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
|
||
}
|
||
|
||
/* Fill in the first entry in the procedure linkage table. */
|
||
if (htab->elf.splt && htab->elf.splt->size > 0)
|
||
{
|
||
if (bfd_link_pic (info))
|
||
{
|
||
memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
|
||
abed->plt->plt0_entry_size);
|
||
memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
|
||
abed->plt0_pad_byte,
|
||
abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
|
||
}
|
||
else
|
||
{
|
||
memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
|
||
abed->plt->plt0_entry_size);
|
||
memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
|
||
abed->plt0_pad_byte,
|
||
abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
|
||
bfd_put_32 (output_bfd,
|
||
(htab->elf.sgotplt->output_section->vma
|
||
+ htab->elf.sgotplt->output_offset
|
||
+ 4),
|
||
htab->elf.splt->contents
|
||
+ abed->plt->plt0_got1_offset);
|
||
bfd_put_32 (output_bfd,
|
||
(htab->elf.sgotplt->output_section->vma
|
||
+ htab->elf.sgotplt->output_offset
|
||
+ 8),
|
||
htab->elf.splt->contents
|
||
+ abed->plt->plt0_got2_offset);
|
||
|
||
if (abed->is_vxworks)
|
||
{
|
||
Elf_Internal_Rela rel;
|
||
|
||
/* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
|
||
On IA32 we use REL relocations so the addend goes in
|
||
the PLT directly. */
|
||
rel.r_offset = (htab->elf.splt->output_section->vma
|
||
+ htab->elf.splt->output_offset
|
||
+ abed->plt->plt0_got1_offset);
|
||
rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
|
||
bfd_elf32_swap_reloc_out (output_bfd, &rel,
|
||
htab->srelplt2->contents);
|
||
/* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
|
||
rel.r_offset = (htab->elf.splt->output_section->vma
|
||
+ htab->elf.splt->output_offset
|
||
+ abed->plt->plt0_got2_offset);
|
||
rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
|
||
bfd_elf32_swap_reloc_out (output_bfd, &rel,
|
||
htab->srelplt2->contents +
|
||
sizeof (Elf32_External_Rel));
|
||
}
|
||
}
|
||
|
||
/* UnixWare sets the entsize of .plt to 4, although that doesn't
|
||
really seem like the right value. */
|
||
elf_section_data (htab->elf.splt->output_section)
|
||
->this_hdr.sh_entsize = 4;
|
||
|
||
/* Correct the .rel.plt.unloaded relocations. */
|
||
if (abed->is_vxworks && !bfd_link_pic (info))
|
||
{
|
||
int num_plts = (htab->elf.splt->size
|
||
/ abed->plt->plt_entry_size) - 1;
|
||
unsigned char *p;
|
||
|
||
p = htab->srelplt2->contents;
|
||
if (bfd_link_pic (info))
|
||
p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
|
||
else
|
||
p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
|
||
|
||
for (; num_plts; num_plts--)
|
||
{
|
||
Elf_Internal_Rela rel;
|
||
bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
|
||
rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
|
||
bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
|
||
p += sizeof (Elf32_External_Rel);
|
||
|
||
bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
|
||
rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
|
||
bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
|
||
p += sizeof (Elf32_External_Rel);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
if (htab->elf.sgotplt)
|
||
{
|
||
if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("discarded output section: `%A'"), htab->elf.sgotplt);
|
||
return FALSE;
|
||
}
|
||
|
||
/* Fill in the first three entries in the global offset table. */
|
||
if (htab->elf.sgotplt->size > 0)
|
||
{
|
||
bfd_put_32 (output_bfd,
|
||
(sdyn == NULL ? 0
|
||
: sdyn->output_section->vma + sdyn->output_offset),
|
||
htab->elf.sgotplt->contents);
|
||
bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
|
||
bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
|
||
}
|
||
|
||
elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
|
||
}
|
||
|
||
/* Adjust .eh_frame for .plt section. */
|
||
if (htab->plt_eh_frame != NULL
|
||
&& htab->plt_eh_frame->contents != NULL)
|
||
{
|
||
if (htab->elf.splt != NULL
|
||
&& htab->elf.splt->size != 0
|
||
&& (htab->elf.splt->flags & SEC_EXCLUDE) == 0
|
||
&& htab->elf.splt->output_section != NULL
|
||
&& htab->plt_eh_frame->output_section != NULL)
|
||
{
|
||
bfd_vma plt_start = htab->elf.splt->output_section->vma;
|
||
bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
|
||
+ htab->plt_eh_frame->output_offset
|
||
+ PLT_FDE_START_OFFSET;
|
||
bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
|
||
htab->plt_eh_frame->contents
|
||
+ PLT_FDE_START_OFFSET);
|
||
}
|
||
if (htab->plt_eh_frame->sec_info_type
|
||
== SEC_INFO_TYPE_EH_FRAME)
|
||
{
|
||
if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
|
||
htab->plt_eh_frame,
|
||
htab->plt_eh_frame->contents))
|
||
return FALSE;
|
||
}
|
||
}
|
||
|
||
if (htab->elf.sgot && htab->elf.sgot->size > 0)
|
||
elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
|
||
|
||
/* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
|
||
htab_traverse (htab->loc_hash_table,
|
||
elf_i386_finish_local_dynamic_symbol,
|
||
info);
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Return an array of PLT entry symbol values. */
|
||
|
||
static bfd_vma *
|
||
elf_i386_get_plt_sym_val (bfd *abfd, asymbol **dynsyms, asection *plt,
|
||
asection *relplt)
|
||
{
|
||
bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
|
||
arelent *p;
|
||
long count, i;
|
||
bfd_vma *plt_sym_val;
|
||
bfd_vma plt_offset;
|
||
bfd_byte *plt_contents;
|
||
const struct elf_i386_backend_data *bed
|
||
= get_elf_i386_backend_data (abfd);
|
||
Elf_Internal_Shdr *hdr;
|
||
|
||
/* Get the .plt section contents. */
|
||
plt_contents = (bfd_byte *) bfd_malloc (plt->size);
|
||
if (plt_contents == NULL)
|
||
return NULL;
|
||
if (!bfd_get_section_contents (abfd, (asection *) plt,
|
||
plt_contents, 0, plt->size))
|
||
{
|
||
bad_return:
|
||
free (plt_contents);
|
||
return NULL;
|
||
}
|
||
|
||
slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
|
||
if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE))
|
||
goto bad_return;
|
||
|
||
hdr = &elf_section_data (relplt)->this_hdr;
|
||
count = relplt->size / hdr->sh_entsize;
|
||
|
||
plt_sym_val = (bfd_vma *) bfd_malloc (sizeof (bfd_vma) * count);
|
||
if (plt_sym_val == NULL)
|
||
goto bad_return;
|
||
|
||
for (i = 0; i < count; i++)
|
||
plt_sym_val[i] = -1;
|
||
|
||
plt_offset = bed->plt->plt_entry_size;
|
||
p = relplt->relocation;
|
||
for (i = 0; i < count; i++, p++)
|
||
{
|
||
long reloc_index;
|
||
|
||
/* Skip unknown relocation. PR 17512: file: bc9d6cf5. */
|
||
if (p->howto == NULL)
|
||
continue;
|
||
|
||
if (p->howto->type != R_386_JUMP_SLOT
|
||
&& p->howto->type != R_386_IRELATIVE)
|
||
continue;
|
||
|
||
reloc_index = H_GET_32 (abfd, (plt_contents + plt_offset
|
||
+ bed->plt->plt_reloc_offset));
|
||
reloc_index /= sizeof (Elf32_External_Rel);
|
||
if (reloc_index >= count)
|
||
abort ();
|
||
plt_sym_val[reloc_index] = plt->vma + plt_offset;
|
||
plt_offset += bed->plt->plt_entry_size;
|
||
|
||
/* PR binutils/18437: Skip extra relocations in the .rel.plt
|
||
section. */
|
||
if (plt_offset >= plt->size)
|
||
break;
|
||
}
|
||
|
||
free (plt_contents);
|
||
|
||
return plt_sym_val;
|
||
}
|
||
|
||
/* Similar to _bfd_elf_get_synthetic_symtab. */
|
||
|
||
static long
|
||
elf_i386_get_synthetic_symtab (bfd *abfd,
|
||
long symcount,
|
||
asymbol **syms,
|
||
long dynsymcount,
|
||
asymbol **dynsyms,
|
||
asymbol **ret)
|
||
{
|
||
asection *plt = bfd_get_section_by_name (abfd, ".plt");
|
||
return _bfd_elf_ifunc_get_synthetic_symtab (abfd, symcount, syms,
|
||
dynsymcount, dynsyms, ret,
|
||
plt,
|
||
elf_i386_get_plt_sym_val);
|
||
}
|
||
|
||
/* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
|
||
|
||
static bfd_boolean
|
||
elf_i386_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);
|
||
}
|
||
|
||
/* Hook called by the linker routine which adds symbols from an object
|
||
file. */
|
||
|
||
static bfd_boolean
|
||
elf_i386_add_symbol_hook (bfd * abfd,
|
||
struct bfd_link_info * info,
|
||
Elf_Internal_Sym * sym,
|
||
const char ** namep ATTRIBUTE_UNUSED,
|
||
flagword * flagsp ATTRIBUTE_UNUSED,
|
||
asection ** secp ATTRIBUTE_UNUSED,
|
||
bfd_vma * valp ATTRIBUTE_UNUSED)
|
||
{
|
||
if (ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE
|
||
&& (abfd->flags & DYNAMIC) == 0
|
||
&& bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
|
||
elf_tdata (info->output_bfd)->has_gnu_symbols
|
||
|= elf_gnu_symbol_unique;
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
#define TARGET_LITTLE_SYM i386_elf32_vec
|
||
#define TARGET_LITTLE_NAME "elf32-i386"
|
||
#define ELF_ARCH bfd_arch_i386
|
||
#define ELF_TARGET_ID I386_ELF_DATA
|
||
#define ELF_MACHINE_CODE EM_386
|
||
#define ELF_MAXPAGESIZE 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 12
|
||
#define elf_backend_plt_alignment 4
|
||
#define elf_backend_extern_protected_data 1
|
||
|
||
/* Support RELA for objdump of prelink objects. */
|
||
#define elf_info_to_howto elf_i386_info_to_howto_rel
|
||
#define elf_info_to_howto_rel elf_i386_info_to_howto_rel
|
||
|
||
#define bfd_elf32_mkobject elf_i386_mkobject
|
||
|
||
#define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
|
||
#define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
|
||
#define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
|
||
#define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
|
||
#define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
|
||
|
||
#define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
|
||
#define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
|
||
#define elf_backend_check_relocs elf_i386_check_relocs
|
||
#define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
|
||
#define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
|
||
#define elf_backend_fake_sections elf_i386_fake_sections
|
||
#define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
|
||
#define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
|
||
#define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
|
||
#define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
|
||
#define elf_backend_grok_prstatus elf_i386_grok_prstatus
|
||
#define elf_backend_grok_psinfo elf_i386_grok_psinfo
|
||
#define elf_backend_reloc_type_class elf_i386_reloc_type_class
|
||
#define elf_backend_relocate_section elf_i386_relocate_section
|
||
#define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
|
||
#define elf_backend_always_size_sections elf_i386_always_size_sections
|
||
#define elf_backend_omit_section_dynsym \
|
||
((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
|
||
#define elf_backend_hash_symbol elf_i386_hash_symbol
|
||
#define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
|
||
|
||
#include "elf32-target.h"
|
||
|
||
/* FreeBSD support. */
|
||
|
||
#undef TARGET_LITTLE_SYM
|
||
#define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
|
||
#undef TARGET_LITTLE_NAME
|
||
#define TARGET_LITTLE_NAME "elf32-i386-freebsd"
|
||
#undef ELF_OSABI
|
||
#define ELF_OSABI ELFOSABI_FREEBSD
|
||
|
||
/* The kernel recognizes executables as valid only if they carry a
|
||
"FreeBSD" label in the ELF header. So we put this label on all
|
||
executables and (for simplicity) also all other object files. */
|
||
|
||
static void
|
||
elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
|
||
{
|
||
_bfd_elf_post_process_headers (abfd, info);
|
||
|
||
#ifdef OLD_FREEBSD_ABI_LABEL
|
||
{
|
||
/* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
|
||
Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
|
||
memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
|
||
}
|
||
#endif
|
||
}
|
||
|
||
#undef elf_backend_post_process_headers
|
||
#define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
|
||
#undef elf32_bed
|
||
#define elf32_bed elf32_i386_fbsd_bed
|
||
|
||
#undef elf_backend_add_symbol_hook
|
||
|
||
#include "elf32-target.h"
|
||
|
||
/* Solaris 2. */
|
||
|
||
#undef TARGET_LITTLE_SYM
|
||
#define TARGET_LITTLE_SYM i386_elf32_sol2_vec
|
||
#undef TARGET_LITTLE_NAME
|
||
#define TARGET_LITTLE_NAME "elf32-i386-sol2"
|
||
|
||
#undef elf_backend_post_process_headers
|
||
|
||
/* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
|
||
objects won't be recognized. */
|
||
#undef ELF_OSABI
|
||
|
||
#undef elf32_bed
|
||
#define elf32_bed elf32_i386_sol2_bed
|
||
|
||
/* The 32-bit static TLS arena size is rounded to the nearest 8-byte
|
||
boundary. */
|
||
#undef elf_backend_static_tls_alignment
|
||
#define elf_backend_static_tls_alignment 8
|
||
|
||
/* The Solaris 2 ABI requires a plt symbol on all platforms.
|
||
|
||
Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
|
||
File, p.63. */
|
||
#undef elf_backend_want_plt_sym
|
||
#define elf_backend_want_plt_sym 1
|
||
|
||
#include "elf32-target.h"
|
||
|
||
/* Intel MCU support. */
|
||
|
||
static bfd_boolean
|
||
elf32_iamcu_elf_object_p (bfd *abfd)
|
||
{
|
||
/* Set the right machine number for an IAMCU elf32 file. */
|
||
bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
|
||
return TRUE;
|
||
}
|
||
|
||
#undef TARGET_LITTLE_SYM
|
||
#define TARGET_LITTLE_SYM iamcu_elf32_vec
|
||
#undef TARGET_LITTLE_NAME
|
||
#define TARGET_LITTLE_NAME "elf32-iamcu"
|
||
#undef ELF_ARCH
|
||
#define ELF_ARCH bfd_arch_iamcu
|
||
|
||
#undef ELF_MACHINE_CODE
|
||
#define ELF_MACHINE_CODE EM_IAMCU
|
||
|
||
#undef ELF_OSABI
|
||
|
||
#undef elf32_bed
|
||
#define elf32_bed elf32_iamcu_bed
|
||
|
||
#undef elf_backend_object_p
|
||
#define elf_backend_object_p elf32_iamcu_elf_object_p
|
||
|
||
#undef elf_backend_static_tls_alignment
|
||
|
||
#undef elf_backend_want_plt_sym
|
||
#define elf_backend_want_plt_sym 0
|
||
|
||
#include "elf32-target.h"
|
||
|
||
/* Restore defaults. */
|
||
#undef ELF_ARCH
|
||
#define ELF_ARCH bfd_arch_i386
|
||
#undef ELF_MACHINE_CODE
|
||
#define ELF_MACHINE_CODE EM_386
|
||
|
||
/* Native Client support. */
|
||
|
||
#undef TARGET_LITTLE_SYM
|
||
#define TARGET_LITTLE_SYM i386_elf32_nacl_vec
|
||
#undef TARGET_LITTLE_NAME
|
||
#define TARGET_LITTLE_NAME "elf32-i386-nacl"
|
||
#undef elf32_bed
|
||
#define elf32_bed elf32_i386_nacl_bed
|
||
|
||
#undef ELF_MAXPAGESIZE
|
||
#define ELF_MAXPAGESIZE 0x10000
|
||
|
||
/* Restore defaults. */
|
||
#undef ELF_OSABI
|
||
#undef elf_backend_want_plt_sym
|
||
#define elf_backend_want_plt_sym 0
|
||
#undef elf_backend_post_process_headers
|
||
#undef elf_backend_static_tls_alignment
|
||
|
||
/* NaCl uses substantially different PLT entries for the same effects. */
|
||
|
||
#undef elf_backend_plt_alignment
|
||
#define elf_backend_plt_alignment 5
|
||
#define NACL_PLT_ENTRY_SIZE 64
|
||
#define NACLMASK 0xe0 /* 32-byte alignment mask. */
|
||
|
||
static const bfd_byte elf_i386_nacl_plt0_entry[] =
|
||
{
|
||
0xff, 0x35, /* pushl contents of address */
|
||
0, 0, 0, 0, /* replaced with address of .got + 4. */
|
||
0x8b, 0x0d, /* movl contents of address, %ecx */
|
||
0, 0, 0, 0, /* replaced with address of .got + 8. */
|
||
0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
|
||
0xff, 0xe1 /* jmp *%ecx */
|
||
};
|
||
|
||
static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
|
||
{
|
||
0x8b, 0x0d, /* movl contents of address, %ecx */
|
||
0, 0, 0, 0, /* replaced with GOT slot address. */
|
||
0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
|
||
0xff, 0xe1, /* jmp *%ecx */
|
||
|
||
/* Pad to the next 32-byte boundary with nop instructions. */
|
||
0x90,
|
||
0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
|
||
0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
|
||
|
||
/* Lazy GOT entries point here (32-byte aligned). */
|
||
0x68, /* pushl immediate */
|
||
0, 0, 0, 0, /* replaced with reloc offset. */
|
||
0xe9, /* jmp relative */
|
||
0, 0, 0, 0, /* replaced with offset to .plt. */
|
||
|
||
/* Pad to the next 32-byte boundary with nop instructions. */
|
||
0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
|
||
0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
|
||
0x90, 0x90
|
||
};
|
||
|
||
static const bfd_byte
|
||
elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
|
||
{
|
||
0xff, 0x73, 0x04, /* pushl 4(%ebx) */
|
||
0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
|
||
0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
|
||
0xff, 0xe1, /* jmp *%ecx */
|
||
|
||
/* This is expected to be the same size as elf_i386_nacl_plt0_entry,
|
||
so pad to that size with nop instructions. */
|
||
0x90, 0x90, 0x90, 0x90, 0x90, 0x90
|
||
};
|
||
|
||
static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
|
||
{
|
||
0x8b, 0x8b, /* movl offset(%ebx), %ecx */
|
||
0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
|
||
0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
|
||
0xff, 0xe1, /* jmp *%ecx */
|
||
|
||
/* Pad to the next 32-byte boundary with nop instructions. */
|
||
0x90,
|
||
0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
|
||
0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
|
||
|
||
/* Lazy GOT entries point here (32-byte aligned). */
|
||
0x68, /* pushl immediate */
|
||
0, 0, 0, 0, /* replaced with offset into relocation table. */
|
||
0xe9, /* jmp relative */
|
||
0, 0, 0, 0, /* replaced with offset to start of .plt. */
|
||
|
||
/* Pad to the next 32-byte boundary with nop instructions. */
|
||
0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
|
||
0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
|
||
0x90, 0x90
|
||
};
|
||
|
||
static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
|
||
{
|
||
#if (PLT_CIE_LENGTH != 20 \
|
||
|| PLT_FDE_LENGTH != 36 \
|
||
|| PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
|
||
|| PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
|
||
# error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
|
||
#endif
|
||
PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
|
||
0, 0, 0, 0, /* CIE ID */
|
||
1, /* CIE version */
|
||
'z', 'R', 0, /* Augmentation string */
|
||
1, /* Code alignment factor */
|
||
0x7c, /* Data alignment factor: -4 */
|
||
8, /* Return address column */
|
||
1, /* Augmentation size */
|
||
DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
|
||
DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
|
||
DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
|
||
DW_CFA_nop, DW_CFA_nop,
|
||
|
||
PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
|
||
PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
|
||
0, 0, 0, 0, /* R_386_PC32 .plt goes here */
|
||
0, 0, 0, 0, /* .plt size goes here */
|
||
0, /* Augmentation size */
|
||
DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
|
||
DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
|
||
DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
|
||
DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
|
||
DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
|
||
13, /* Block length */
|
||
DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
|
||
DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
|
||
DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
|
||
DW_OP_lit2, DW_OP_shl, DW_OP_plus,
|
||
DW_CFA_nop, DW_CFA_nop
|
||
};
|
||
|
||
static const struct elf_i386_plt_layout elf_i386_nacl_plt =
|
||
{
|
||
elf_i386_nacl_plt0_entry, /* plt0_entry */
|
||
sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
|
||
2, /* plt0_got1_offset */
|
||
8, /* plt0_got2_offset */
|
||
elf_i386_nacl_plt_entry, /* plt_entry */
|
||
NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
|
||
2, /* plt_got_offset */
|
||
33, /* plt_reloc_offset */
|
||
38, /* plt_plt_offset */
|
||
32, /* plt_lazy_offset */
|
||
elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
|
||
elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
|
||
elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
|
||
sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
|
||
};
|
||
|
||
static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
|
||
{
|
||
&elf_i386_nacl_plt, /* plt */
|
||
0x90, /* plt0_pad_byte: nop insn */
|
||
0, /* is_vxworks */
|
||
};
|
||
|
||
static bfd_boolean
|
||
elf32_i386_nacl_elf_object_p (bfd *abfd)
|
||
{
|
||
/* Set the right machine number for a NaCl i386 ELF32 file. */
|
||
bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
|
||
return TRUE;
|
||
}
|
||
|
||
#undef elf_backend_arch_data
|
||
#define elf_backend_arch_data &elf_i386_nacl_arch_bed
|
||
|
||
#undef elf_backend_object_p
|
||
#define elf_backend_object_p elf32_i386_nacl_elf_object_p
|
||
#undef elf_backend_modify_segment_map
|
||
#define elf_backend_modify_segment_map nacl_modify_segment_map
|
||
#undef elf_backend_modify_program_headers
|
||
#define elf_backend_modify_program_headers nacl_modify_program_headers
|
||
#undef elf_backend_final_write_processing
|
||
#define elf_backend_final_write_processing nacl_final_write_processing
|
||
|
||
#include "elf32-target.h"
|
||
|
||
/* Restore defaults. */
|
||
#undef elf_backend_object_p
|
||
#undef elf_backend_modify_segment_map
|
||
#undef elf_backend_modify_program_headers
|
||
#undef elf_backend_final_write_processing
|
||
|
||
/* VxWorks support. */
|
||
|
||
#undef TARGET_LITTLE_SYM
|
||
#define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
|
||
#undef TARGET_LITTLE_NAME
|
||
#define TARGET_LITTLE_NAME "elf32-i386-vxworks"
|
||
#undef ELF_OSABI
|
||
#undef elf_backend_plt_alignment
|
||
#define elf_backend_plt_alignment 4
|
||
|
||
static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
|
||
{
|
||
&elf_i386_plt, /* plt */
|
||
0x90, /* plt0_pad_byte */
|
||
1, /* is_vxworks */
|
||
};
|
||
|
||
#undef elf_backend_arch_data
|
||
#define elf_backend_arch_data &elf_i386_vxworks_arch_bed
|
||
|
||
#undef elf_backend_relocs_compatible
|
||
#undef elf_backend_add_symbol_hook
|
||
#define elf_backend_add_symbol_hook \
|
||
elf_vxworks_add_symbol_hook
|
||
#undef elf_backend_link_output_symbol_hook
|
||
#define elf_backend_link_output_symbol_hook \
|
||
elf_vxworks_link_output_symbol_hook
|
||
#undef elf_backend_emit_relocs
|
||
#define elf_backend_emit_relocs elf_vxworks_emit_relocs
|
||
#undef elf_backend_final_write_processing
|
||
#define elf_backend_final_write_processing \
|
||
elf_vxworks_final_write_processing
|
||
#undef elf_backend_static_tls_alignment
|
||
|
||
/* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
|
||
define it. */
|
||
#undef elf_backend_want_plt_sym
|
||
#define elf_backend_want_plt_sym 1
|
||
|
||
#undef elf32_bed
|
||
#define elf32_bed elf32_i386_vxworks_bed
|
||
|
||
#include "elf32-target.h"
|