349 lines
10 KiB
C
349 lines
10 KiB
C
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/* D30V-specific support for 32-bit ELF
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Copyright (C) 1997 Free Software Foundation, Inc.
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Contributed by Martin Hunt (hunt@cygnus.com).
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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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static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
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PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
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static void d30v_info_to_howto_rel
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PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *));
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static bfd_reloc_status_type bfd_elf_d30v_reloc PARAMS ((
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bfd *abfd,
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arelent *reloc_entry,
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asymbol *symbol,
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PTR data,
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asection *input_section,
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bfd *output_bfd,
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char **error_message));
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/* Use REL instead of RELA to save space */
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#define USE_REL
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enum reloc_type
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{
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R_D30V_NONE = 0,
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R_D30V_6,
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R_D30V_15,
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R_D30V_15_PCREL,
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R_D30V_21,
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R_D30V_21_PCREL,
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R_D30V_32,
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R_D30V_32_PCREL,
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R_D30V_32_NORMAL,
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R_D30V_max
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};
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static reloc_howto_type elf_d30v_howto_table[] =
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{
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/* This reloc does nothing. */
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HOWTO (R_D30V_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_D30V_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 6 bit absolute relocation */
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HOWTO (R_D30V_6, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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6, /* 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_D30V_6", /* name */
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false, /* partial_inplace */
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0x3f, /* src_mask */
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0x3f, /* dst_mask */
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false), /* pcrel_offset */
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/* An absolute 15 bit relocation, right shifted by 3 */
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HOWTO (R_D30V_15, /* type */
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3, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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15, /* 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_D30V_15", /* name */
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false, /* partial_inplace */
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0xfff, /* src_mask */
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0xfff, /* dst_mask */
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false), /* pcrel_offset */
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/* A relative 15 bit relocation, right shifted by 3 */
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HOWTO (R_D30V_15_PCREL, /* type */
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3, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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15, /* 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_D30V_15_PCREL", /* name */
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false, /* partial_inplace */
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0xfff, /* src_mask */
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0xfff, /* dst_mask */
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true), /* pcrel_offset */
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/* An absolute 21 bit relocation, right shifted by 3 */
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HOWTO (R_D30V_21_PCREL, /* type */
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3, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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21, /* 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_D30V_21", /* name */
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false, /* partial_inplace */
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0x3ffff, /* src_mask */
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0x3ffff, /* dst_mask */
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false), /* pcrel_offset */
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/* A relative 21 bit relocation, right shifted by 3 */
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HOWTO (R_D30V_21_PCREL, /* type */
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3, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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21, /* 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_D30V_21_PCREL", /* name */
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false, /* partial_inplace */
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0x3ffff, /* src_mask */
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0x3ffff, /* dst_mask */
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true), /* pcrel_offset */
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/* A D30V 32 bit absolute relocation */
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HOWTO (R_D30V_32, /* type */
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0, /* rightshift */
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4, /* 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_d30v_reloc, /* special_function */
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"R_D30V_32", /* name */
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false, /* partial_inplace */
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0xffffffff, /* src_mask */
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0xffffffff, /* dst_mask */
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false), /* pcrel_offset */
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/* A relative 32 bit relocation */
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HOWTO (R_D30V_32_PCREL, /* type */
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0, /* rightshift */
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4, /* size (0 = byte, 1 = short, 2 = long) */
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32, /* 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_d30v_reloc, /* special_function */
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"R_D30V_32_PCREL", /* name */
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false, /* partial_inplace */
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0xffffffff, /* src_mask */
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0xffffffff, /* dst_mask */
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true), /* pcrel_offset */
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/* A regular 32 bit absolute relocation */
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HOWTO (R_D30V_32_NORMAL, /* type */
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0, /* rightshift */
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4, /* 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_D30V_32_NORMAL", /* name */
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false, /* partial_inplace */
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0xffffffff, /* src_mask */
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0xffffffff, /* dst_mask */
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false), /* pcrel_offset */
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};
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static bfd_reloc_status_type
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bfd_elf_d30v_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd, error_message)
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bfd *abfd;
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arelent *reloc_entry;
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asymbol *symbol;
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PTR data;
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asection *input_section;
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bfd *output_bfd;
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char **error_message;
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{
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bfd_vma relocation;
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bfd_vma in1, in2;
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bfd_reloc_status_type r;
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asection *reloc_target_output_section;
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bfd_size_type addr = reloc_entry->address;
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bfd_reloc_status_type flag = bfd_reloc_ok;
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bfd_vma output_base = 0;
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reloc_howto_type *howto = reloc_entry->howto;
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r = bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
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input_section, output_bfd, error_message);
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if (r != bfd_reloc_continue)
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return r;
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/* a hacked-up version of bfd_perform_reloc() follows */
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/* Is the address of the relocation really within the section? */
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if (reloc_entry->address > input_section->_cooked_size)
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return bfd_reloc_outofrange;
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/* Work out which section the relocation is targetted at and the
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initial relocation command value. */
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/* Get symbol value. (Common symbols are special.) */
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if (bfd_is_com_section (symbol->section))
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relocation = 0;
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else
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relocation = symbol->value;
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reloc_target_output_section = symbol->section->output_section;
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/* Convert input-section-relative symbol value to absolute. */
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if (output_bfd)
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output_base = 0;
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else
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output_base = reloc_target_output_section->vma;
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relocation += output_base + symbol->section->output_offset;
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/* Add in supplied addend. */
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relocation += reloc_entry->addend;
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/* Here the variable relocation holds the final address of the
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symbol we are relocating against, plus any addend. */
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if (howto->pc_relative == true)
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{
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relocation -= input_section->output_section->vma + input_section->output_offset;
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if (howto->pcrel_offset == true)
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relocation -= reloc_entry->address;
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}
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if (output_bfd != (bfd *) NULL)
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{
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/* This is a partial relocation, and we want to apply the relocation
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to the reloc entry rather than the raw data. Modify the reloc
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inplace to reflect what we now know. */
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reloc_entry->addend = relocation;
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reloc_entry->address += input_section->output_offset;
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return flag;
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}
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else
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reloc_entry->addend = 0;
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in1 = bfd_get_32 (abfd, (bfd_byte *) data + addr);
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in2 = bfd_get_32 (abfd, (bfd_byte *) data + addr + 4);
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printf("D30V 32-bit reloc at addr 0x%lx insn=0x%08x%08x\n",(long)relocation, (int)in1, (int)in2);
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bfd_put_32 (abfd, in1, (bfd_byte *) data + addr);
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bfd_put_32 (abfd, in2, (bfd_byte *) data + addr + 4);
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return flag;
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}
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/* Map BFD reloc types to D30V ELF reloc types. */
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struct d30v_reloc_map
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{
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unsigned char bfd_reloc_val;
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unsigned char elf_reloc_val;
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};
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static const struct d30v_reloc_map d30v_reloc_map[] =
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{
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{ BFD_RELOC_NONE, R_D30V_NONE, },
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{ BFD_RELOC_D30V_6, R_D30V_6 },
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{ BFD_RELOC_D30V_15, R_D30V_15 },
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{ BFD_RELOC_D30V_15_PCREL, R_D30V_15_PCREL },
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{ BFD_RELOC_D30V_21, R_D30V_21 },
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{ BFD_RELOC_D30V_21_PCREL, R_D30V_21_PCREL },
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{ BFD_RELOC_D30V_32, R_D30V_32 },
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{ BFD_RELOC_D30V_32_PCREL, R_D30V_32_PCREL },
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{ BFD_RELOC_32, R_D30V_32_NORMAL },
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};
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static reloc_howto_type *
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bfd_elf32_bfd_reloc_type_lookup (abfd, code)
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bfd *abfd;
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bfd_reloc_code_real_type code;
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{
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unsigned int i;
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for (i = 0;
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i < sizeof (d30v_reloc_map) / sizeof (struct d30v_reloc_map);
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i++)
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{
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if (d30v_reloc_map[i].bfd_reloc_val == code)
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return &elf_d30v_howto_table[d30v_reloc_map[i].elf_reloc_val];
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}
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return NULL;
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}
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/* Set the howto pointer for an D30V ELF reloc. */
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static void
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d30v_info_to_howto_rel (abfd, cache_ptr, dst)
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bfd *abfd;
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arelent *cache_ptr;
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Elf32_Internal_Rel *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_D30V_max);
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cache_ptr->howto = &elf_d30v_howto_table[r_type];
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}
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#define ELF_ARCH bfd_arch_d30v
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#define ELF_MACHINE_CODE EM_CYGNUS_D30V
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#define ELF_MAXPAGESIZE 0x1000
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#define TARGET_BIG_SYM bfd_elf32_d30v_vec
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#define TARGET_BIG_NAME "elf32-d30v"
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#define elf_info_to_howto 0
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#define elf_info_to_howto_rel d30v_info_to_howto_rel
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#define elf_backend_object_p 0
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#define elf_backend_final_write_processing 0
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#include "elf32-target.h"
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