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661 lines
19 KiB
C
661 lines
19 KiB
C
/* OpenRISC-specific support for 32-bit ELF.
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Copyright (C) 2001 Free Software Foundation, Inc.
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Contributed by Johan Rydberg, jrydberg@opencores.org
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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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "bfd.h"
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#include "sysdep.h"
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#include "libbfd.h"
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#include "elf-bfd.h"
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#include "elf/openrisc.h"
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#include "libiberty.h"
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/* Forward declarations. */
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static reloc_howto_type *openrisc_reloc_type_lookup
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PARAMS ((bfd * , bfd_reloc_code_real_type));
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static void openrisc_info_to_howto_rela
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PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
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static boolean openrisc_elf_relocate_section
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PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
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Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
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static bfd_reloc_status_type openrisc_final_link_relocate
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PARAMS ((reloc_howto_type *, bfd *, asection *, bfd_byte *,
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Elf_Internal_Rela *, bfd_vma));
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static boolean openrisc_elf_gc_sweep_hook
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PARAMS ((bfd *, struct bfd_link_info *, asection *,
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const Elf_Internal_Rela *));
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static asection * openrisc_elf_gc_mark_hook
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PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
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struct elf_link_hash_entry *, Elf_Internal_Sym *));
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static boolean openrisc_elf_check_relocs
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PARAMS ((bfd *, struct bfd_link_info *, asection *,
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const Elf_Internal_Rela *));
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static boolean openrisc_elf_object_p
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PARAMS ((bfd *));
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static void openrisc_elf_final_write_processing
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PARAMS ((bfd *, boolean));
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static reloc_howto_type openrisc_elf_howto_table[] =
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{
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/* This reloc does nothing. */
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HOWTO (R_OPENRISC_NONE, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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32, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_OPENRISC_NONE", /* 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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/* A PC relative 26 bit relocation, right shifted by 2. */
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HOWTO (R_OPENRISC_INSN_REL_26, /* type */
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2, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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26, /* bitsize */
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true, /* pc_relative */
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0, /* bitpos */
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complain_overflow_signed, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_OPENRISC_INSN_REL_26", /* name */
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false, /* partial_inplace */
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0x00000000, /* src_mask */
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0x03ffffff, /* dst_mask */
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false), /* pcrel_offset */
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/* A absolute 26 bit relocation, right shifted by 2. */
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HOWTO (R_OPENRISC_INSN_ABS_26, /* type */
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2, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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26, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_signed, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_OPENRISC_INSN_ABS_26", /* name */
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false, /* partial_inplace */
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0x00000000, /* src_mask */
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0x03ffffff, /* dst_mask */
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false), /* pcrel_offset */
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HOWTO (R_OPENRISC_LO_16_IN_INSN, /* type */
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0, /* rightshift */
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1, /* size (0 = byte, 1 = short, 2 = long) */
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16, /* 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_generic_reloc, /* special_function */
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"R_OPENRISC_LO_16_IN_INSN", /* name */
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false, /* partial_inplace */
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0, /* src_mask */
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0x0000ffff, /* dst_mask */
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false), /* pcrel_offset */
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HOWTO (R_OPENRISC_HI_16_IN_INSN, /* type */
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16, /* rightshift */
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1, /* size (0 = byte, 1 = short, 2 = long) */
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16, /* 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_generic_reloc, /* special_function */
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"R_OPENRISC_HI_16_IN_INSN", /* name */
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false, /* partial_inplace */
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0, /* src_mask */
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0x0000ffff, /* dst_mask */
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false), /* pcrel_offset */
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/* An 8 bit absolute relocation. */
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HOWTO (R_OPENRISC_8, /* type */
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0, /* rightshift */
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0, /* size (0 = byte, 1 = short, 2 = long) */
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8, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_OPENRISC_8", /* name */
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true, /* partial_inplace */
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0x0000, /* src_mask */
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0x00ff, /* dst_mask */
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false), /* pcrel_offset */
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/* A 16 bit absolute relocation. */
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HOWTO (R_OPENRISC_16, /* type */
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0, /* rightshift */
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1, /* size (0 = byte, 1 = short, 2 = long) */
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16, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_OPENRISC_16", /* name */
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true, /* partial_inplace */
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0x00000000, /* src_mask */
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0x0000ffff, /* dst_mask */
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false), /* pcrel_offset */
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/* A 32 bit absolute relocation. */
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HOWTO (R_OPENRISC_32, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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32, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_OPENRISC_32", /* name */
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true, /* partial_inplace */
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0x00000000, /* src_mask */
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0xffffffff, /* dst_mask */
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false), /* pcrel_offset */
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/* GNU extension to record C++ vtable hierarchy */
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HOWTO (R_OPENRISC_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_OPENRISC_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_OPENRISC_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_OPENRISC_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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};
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/* Map BFD reloc types to OpenRISC ELF reloc types. */
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struct openrisc_reloc_map
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{
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bfd_reloc_code_real_type bfd_reloc_val;
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unsigned int openrisc_reloc_val;
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};
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static const struct openrisc_reloc_map openrisc_reloc_map[] =
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{
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{ BFD_RELOC_NONE, R_OPENRISC_NONE },
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{ BFD_RELOC_32, R_OPENRISC_32 },
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{ BFD_RELOC_16, R_OPENRISC_16 },
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{ BFD_RELOC_8, R_OPENRISC_8 },
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{ BFD_RELOC_OPENRISC_REL_26,R_OPENRISC_INSN_REL_26 },
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{ BFD_RELOC_OPENRISC_ABS_26,R_OPENRISC_INSN_ABS_26 },
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{ BFD_RELOC_HI16, R_OPENRISC_HI_16_IN_INSN },
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{ BFD_RELOC_LO16, R_OPENRISC_LO_16_IN_INSN },
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{ BFD_RELOC_VTABLE_INHERIT, R_OPENRISC_GNU_VTINHERIT },
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{ BFD_RELOC_VTABLE_ENTRY, R_OPENRISC_GNU_VTENTRY }
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};
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static reloc_howto_type *
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openrisc_reloc_type_lookup (abfd, code)
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bfd * abfd ATTRIBUTE_UNUSED;
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bfd_reloc_code_real_type code;
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{
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unsigned int i;
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for (i = ARRAY_SIZE (openrisc_reloc_map); --i;)
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if (openrisc_reloc_map[i].bfd_reloc_val == code)
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return & openrisc_elf_howto_table[openrisc_reloc_map[i].
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openrisc_reloc_val];
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return NULL;
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}
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/* Set the howto pointer for an OpenRISC ELF reloc. */
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static void
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openrisc_info_to_howto_rela (abfd, cache_ptr, dst)
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bfd * abfd ATTRIBUTE_UNUSED;
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arelent * cache_ptr;
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Elf32_Internal_Rela * dst;
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{
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unsigned int r_type;
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r_type = ELF32_R_TYPE (dst->r_info);
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BFD_ASSERT (r_type < (unsigned int) R_OPENRISC_max);
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cache_ptr->howto = & openrisc_elf_howto_table[r_type];
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}
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/* Perform a single relocation. By default we use the standard BFD
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routines, but a few relocs, we have to do them ourselves. */
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static bfd_reloc_status_type
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openrisc_final_link_relocate (howto, input_bfd, input_section, contents, rel,
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relocation)
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reloc_howto_type *howto;
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bfd *input_bfd;
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asection *input_section;
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bfd_byte *contents;
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Elf_Internal_Rela *rel;
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bfd_vma relocation;
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{
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bfd_reloc_status_type r = bfd_reloc_ok;
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switch (howto->type)
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{
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case R_OPENRISC_LO_16_IN_INSN:
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relocation &= 0xffff;
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r = _bfd_final_link_relocate (howto, input_bfd, input_section,
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contents, rel->r_offset,
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relocation, rel->r_addend);
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break;
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default:
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r = _bfd_final_link_relocate (howto, input_bfd, input_section,
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contents, rel->r_offset,
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relocation, rel->r_addend);
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}
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return r;
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}
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/* Relocate an OpenRISC ELF section.
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There is some attempt to make this function usable for many architectures,
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both USE_REL and USE_RELA ['twould be nice if such a critter existed],
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if only to serve as a learning tool.
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The RELOCATE_SECTION function is called by the new ELF backend linker
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to handle the relocations for a section.
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The relocs are always passed as Rela structures; if the section
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actually uses Rel structures, the r_addend field will always be
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zero.
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This function is responsible for adjusting the section contents as
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necessary, and (if using Rela relocs and generating a relocateable
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output file) adjusting the reloc addend as necessary.
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This function does not have to worry about setting the reloc
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address or the reloc symbol index.
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LOCAL_SYMS is a pointer to the swapped in local symbols.
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LOCAL_SECTIONS is an array giving the section in the input file
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corresponding to the st_shndx field of each local symbol.
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The global hash table entry for the global symbols can be found
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via elf_sym_hashes (input_bfd).
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When generating relocateable output, this function must handle
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STB_LOCAL/STT_SECTION symbols specially. The output symbol is
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going to be the section symbol corresponding to the output
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section, which means that the addend must be adjusted
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accordingly. */
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static boolean
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openrisc_elf_relocate_section (output_bfd, info, input_bfd, input_section,
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contents, relocs, local_syms, local_sections)
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bfd *output_bfd ATTRIBUTE_UNUSED;
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struct bfd_link_info *info;
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bfd *input_bfd;
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asection *input_section;
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bfd_byte *contents;
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Elf_Internal_Rela *relocs;
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Elf_Internal_Sym *local_syms;
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asection **local_sections;
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{
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Elf_Internal_Shdr *symtab_hdr;
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struct elf_link_hash_entry **sym_hashes;
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Elf_Internal_Rela *rel;
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Elf_Internal_Rela *relend;
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symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
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sym_hashes = elf_sym_hashes (input_bfd);
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relend = relocs + input_section->reloc_count;
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for (rel = relocs; rel < relend; rel++)
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{
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reloc_howto_type *howto;
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unsigned long r_symndx;
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Elf_Internal_Sym *sym;
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asection *sec;
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struct elf_link_hash_entry *h;
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bfd_vma relocation;
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bfd_reloc_status_type r;
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const char *name = NULL;
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int r_type;
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r_type = ELF32_R_TYPE (rel->r_info);
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r_symndx = ELF32_R_SYM (rel->r_info);
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if (r_type == R_OPENRISC_GNU_VTINHERIT
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|| r_type == R_OPENRISC_GNU_VTENTRY)
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continue;
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if (info->relocateable)
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{
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/* This is a relocateable link. We don't have to change
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anything, unless the reloc is against a section symbol,
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in which case we have to adjust according to where the
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section symbol winds up in the output section. */
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if (r_symndx < symtab_hdr->sh_info)
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{
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sym = local_syms + r_symndx;
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if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
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{
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sec = local_sections[r_symndx];
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rel->r_addend += sec->output_offset + sym->st_value;
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}
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}
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continue;
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}
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if ((unsigned int) r_type >
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(sizeof openrisc_elf_howto_table / sizeof (reloc_howto_type)))
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abort ();
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/* This is a final link. */
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howto = openrisc_elf_howto_table + ELF32_R_TYPE (rel->r_info);
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h = NULL;
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sym = NULL;
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sec = NULL;
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if (r_symndx < symtab_hdr->sh_info)
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{
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sym = local_syms + r_symndx;
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sec = local_sections[r_symndx];
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relocation = (sec->output_section->vma
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+ sec->output_offset + sym->st_value);
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name = bfd_elf_string_from_elf_section
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(input_bfd, symtab_hdr->sh_link, sym->st_name);
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name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
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}
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else
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{
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h = sym_hashes[r_symndx - symtab_hdr->sh_info];
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while (h->root.type == bfd_link_hash_indirect
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|| h->root.type == bfd_link_hash_warning)
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h = (struct elf_link_hash_entry *) h->root.u.i.link;
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name = h->root.root.string;
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if (h->root.type == bfd_link_hash_defined
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|| h->root.type == bfd_link_hash_defweak)
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{
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sec = h->root.u.def.section;
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relocation = (h->root.u.def.value
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+ sec->output_section->vma + sec->output_offset);
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}
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else if (h->root.type == bfd_link_hash_undefweak)
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{
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relocation = 0;
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}
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else
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{
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if (!((*info->callbacks->undefined_symbol)
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(info, h->root.root.string, input_bfd,
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input_section, rel->r_offset, true)))
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return false;
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relocation = 0;
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}
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}
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r = openrisc_final_link_relocate (howto, input_bfd, input_section,
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contents, rel, relocation);
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if (r != bfd_reloc_ok)
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{
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const char *msg = (const char *) NULL;
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switch (r)
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{
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case bfd_reloc_overflow:
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r = info->callbacks->reloc_overflow
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(info, name, howto->name, (bfd_vma) 0,
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input_bfd, input_section, rel->r_offset);
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break;
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case bfd_reloc_undefined:
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r = info->callbacks->undefined_symbol
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(info, name, input_bfd, input_section, rel->r_offset, true);
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break;
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case bfd_reloc_outofrange:
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msg = _("internal error: out of range error");
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break;
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case bfd_reloc_notsupported:
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msg = _("internal error: unsupported relocation error");
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break;
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case bfd_reloc_dangerous:
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msg = _("internal error: dangerous relocation");
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break;
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default:
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msg = _("internal error: unknown error");
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break;
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}
|
|
|
|
if (msg)
|
|
r = info->callbacks->warning
|
|
(info, msg, name, input_bfd, input_section, rel->r_offset);
|
|
|
|
if (!r)
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/* Return the section that should be marked against GC for a given
|
|
relocation. */
|
|
|
|
static asection *
|
|
openrisc_elf_gc_mark_hook (abfd, info, rel, h, sym)
|
|
bfd *abfd ATTRIBUTE_UNUSED;
|
|
struct bfd_link_info *info ATTRIBUTE_UNUSED;
|
|
Elf_Internal_Rela *rel ATTRIBUTE_UNUSED;
|
|
struct elf_link_hash_entry *h ATTRIBUTE_UNUSED;
|
|
Elf_Internal_Sym *sym ATTRIBUTE_UNUSED;
|
|
{
|
|
if (h != NULL)
|
|
{
|
|
switch (ELF32_R_TYPE (rel->r_info))
|
|
{
|
|
case R_OPENRISC_GNU_VTINHERIT:
|
|
case R_OPENRISC_GNU_VTENTRY:
|
|
break;
|
|
|
|
default:
|
|
switch (h->root.type)
|
|
{
|
|
case bfd_link_hash_defined:
|
|
case bfd_link_hash_defweak:
|
|
return h->root.u.def.section;
|
|
|
|
case bfd_link_hash_common:
|
|
return h->root.u.c.p->section;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (!(elf_bad_symtab (abfd)
|
|
&& ELF_ST_BIND (sym->st_info) != STB_LOCAL)
|
|
&& !((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
|
|
&& sym->st_shndx != SHN_COMMON))
|
|
{
|
|
return bfd_section_from_elf_index (abfd, sym->st_shndx);
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* Update the got entry reference counts for the section being removed. */
|
|
|
|
static boolean
|
|
openrisc_elf_gc_sweep_hook (abfd, info, sec, relocs)
|
|
bfd *abfd ATTRIBUTE_UNUSED;
|
|
struct bfd_link_info *info ATTRIBUTE_UNUSED;
|
|
asection *sec ATTRIBUTE_UNUSED;
|
|
const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED;
|
|
{
|
|
return true;
|
|
}
|
|
|
|
/* Look through the relocs for a section during the first phase.
|
|
Since we don't do .gots or .plts, we just need to consider the
|
|
virtual table relocs for gc. */
|
|
|
|
static boolean
|
|
openrisc_elf_check_relocs (abfd, info, sec, relocs)
|
|
bfd *abfd;
|
|
struct bfd_link_info *info;
|
|
asection *sec;
|
|
const Elf_Internal_Rela *relocs;
|
|
{
|
|
Elf_Internal_Shdr *symtab_hdr;
|
|
struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
|
|
const Elf_Internal_Rela *rel;
|
|
const Elf_Internal_Rela *rel_end;
|
|
|
|
if (info->relocateable)
|
|
return true;
|
|
|
|
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
|
|
sym_hashes = elf_sym_hashes (abfd);
|
|
sym_hashes_end =
|
|
sym_hashes + symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
|
|
if (!elf_bad_symtab (abfd))
|
|
sym_hashes_end -= symtab_hdr->sh_info;
|
|
|
|
rel_end = relocs + sec->reloc_count;
|
|
for (rel = relocs; rel < rel_end; rel++)
|
|
{
|
|
struct elf_link_hash_entry *h;
|
|
unsigned long r_symndx;
|
|
|
|
r_symndx = ELF32_R_SYM (rel->r_info);
|
|
if (r_symndx < symtab_hdr->sh_info)
|
|
h = NULL;
|
|
else
|
|
h = sym_hashes[r_symndx - symtab_hdr->sh_info];
|
|
|
|
switch (ELF32_R_TYPE (rel->r_info))
|
|
{
|
|
/* This relocation describes the C++ object vtable hierarchy.
|
|
Reconstruct it for later use during GC. */
|
|
case R_OPENRISC_GNU_VTINHERIT:
|
|
if (!_bfd_elf32_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_OPENRISC_GNU_VTENTRY:
|
|
if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
|
|
return false;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/* Set the right machine number. */
|
|
|
|
static boolean
|
|
openrisc_elf_object_p (abfd)
|
|
bfd *abfd;
|
|
{
|
|
switch (elf_elfheader (abfd)->e_flags & 0xf)
|
|
{
|
|
default:
|
|
(void) bfd_default_set_arch_mach (abfd, bfd_arch_openrisc, 0);
|
|
break;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/* Store the machine number in the flags field. */
|
|
|
|
static void
|
|
openrisc_elf_final_write_processing (abfd, linker)
|
|
bfd *abfd;
|
|
boolean linker ATTRIBUTE_UNUSED;
|
|
{
|
|
unsigned long val;
|
|
|
|
switch (bfd_get_mach (abfd))
|
|
{
|
|
default:
|
|
val = 0;
|
|
break;
|
|
}
|
|
|
|
elf_elfheader (abfd)->e_flags &= ~0xf;
|
|
elf_elfheader (abfd)->e_flags |= val;
|
|
}
|
|
|
|
|
|
#define ELF_ARCH bfd_arch_openrisc
|
|
#define ELF_MACHINE_CODE EM_OPENRISC
|
|
#define ELF_MAXPAGESIZE 0x1000
|
|
|
|
#define TARGET_BIG_SYM bfd_elf32_openrisc_vec
|
|
#define TARGET_BIG_NAME "elf32-openrisc"
|
|
|
|
#define elf_info_to_howto_rel NULL
|
|
#define elf_info_to_howto openrisc_info_to_howto_rela
|
|
#define elf_backend_relocate_section openrisc_elf_relocate_section
|
|
#define elf_backend_gc_mark_hook openrisc_elf_gc_mark_hook
|
|
#define elf_backend_gc_sweep_hook openrisc_elf_gc_sweep_hook
|
|
#define elf_backend_check_relocs openrisc_elf_check_relocs
|
|
|
|
#define elf_backend_can_gc_sections 1
|
|
|
|
#define bfd_elf32_bfd_reloc_type_lookup openrisc_reloc_type_lookup
|
|
|
|
#define elf_backend_object_p openrisc_elf_object_p
|
|
#define elf_backend_final_write_processing openrisc_elf_final_write_processing
|
|
|
|
#include "elf32-target.h"
|