384 lines
12 KiB
C
384 lines
12 KiB
C
/* M32R-specific support for 32-bit ELF.
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Copyright (C) 1996, 1997 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 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/m32r.h"
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static bfd_reloc_status_type m32r_elf_10_pcrel_reloc
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PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
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static bfd_reloc_status_type m32r_elf_hi16_slo_reloc
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PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
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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 m32r_info_to_howto_rel
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PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *));
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/* Use REL instead of RELA to save space. */
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#define USE_REL
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static reloc_howto_type elf_m32r_howto_table[] =
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{
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/* This reloc does nothing. */
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HOWTO (R_M32R_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_M32R_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 16 bit absolute relocation. */
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HOWTO (R_M32R_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_M32R_16", /* name */
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false, /* partial_inplace */
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0xffff, /* src_mask */
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0xffff, /* dst_mask */
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false), /* pcrel_offset */
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/* A 32 bit absolute relocation. */
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HOWTO (R_M32R_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_M32R_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 24 bit address. */
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HOWTO (R_M32R_24, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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24, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_unsigned, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_M32R_24", /* name */
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false, /* partial_inplace */
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0xffffff, /* src_mask */
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0xffffff, /* dst_mask */
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false), /* pcrel_offset */
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/* An PC Relative 10-bit relocation, shifted by 2.
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This reloc is complicated because relocations are relative to pc & -4.
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i.e. branches in the right insn slot use the address of the left insn
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slot for pc. */
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HOWTO (R_M32R_10_PCREL, /* type */
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2, /* rightshift */
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1, /* size (0 = byte, 1 = short, 2 = long) */
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10, /* 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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m32r_elf_10_pcrel_reloc, /* special_function */
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"R_M32R_10_PCREL", /* name */
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false, /* partial_inplace */
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0xff, /* src_mask */
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0xff, /* dst_mask */
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true), /* pcrel_offset */
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/* A relative 18 bit relocation, right shifted by 2. */
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HOWTO (R_M32R_18_PCREL, /* type */
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2, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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18, /* 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_M32R_18_PCREL", /* name */
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false, /* partial_inplace */
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0xffff, /* src_mask */
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0xffff, /* dst_mask */
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true), /* pcrel_offset */
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/* A relative 26 bit relocation, right shifted by 2. */
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HOWTO (R_M32R_26_PCREL, /* 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_M32R_26_PCREL", /* name */
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false, /* partial_inplace */
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0xffffff, /* src_mask */
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0xffffff, /* dst_mask */
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true), /* pcrel_offset */
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/* High 16 bits of address when lower 16 is or'd in. */
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HOWTO (R_M32R_HI16_ULO, /* type */
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16, /* rightshift */
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2, /* 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_M32R_HI16_ULO", /* name */
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false, /* partial_inplace */
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0x0000ffff, /* src_mask */
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0x0000ffff, /* dst_mask */
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false), /* pcrel_offset */
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/* High 16 bits of address when lower 16 is added in. */
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HOWTO (R_M32R_HI16_SLO, /* type */
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16, /* rightshift */
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2, /* 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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m32r_elf_hi16_slo_reloc, /* special_function */
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"R_M32R_HI16_SLO", /* name */
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false, /* partial_inplace */
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0x0000ffff, /* src_mask */
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0x0000ffff, /* dst_mask */
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false), /* pcrel_offset */
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/* Lower 16 bits of address. */
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HOWTO (R_M32R_LO16, /* type */
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0, /* rightshift */
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2, /* 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_M32R_LO16", /* name */
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false, /* partial_inplace */
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0x0000ffff, /* src_mask */
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0x0000ffff, /* dst_mask */
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false), /* pcrel_offset */
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};
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/* Handle the R_M32R_10_PCREL reloc. */
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static bfd_reloc_status_type
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m32r_elf_10_pcrel_reloc (abfd, reloc_entry, symbol, data,
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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 x;
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reloc_howto_type *howto;
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/* This part if from bfd_elf_generic_reloc. */
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if (output_bfd != (bfd *) NULL
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&& (symbol->flags & BSF_SECTION_SYM) == 0
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&& (! reloc_entry->howto->partial_inplace
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|| reloc_entry->addend == 0))
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{
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reloc_entry->address += input_section->output_offset;
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return bfd_reloc_ok;
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}
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if (output_bfd != NULL)
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{
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/* FIXME: See bfd_perform_relocation. Is this right? */
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return bfd_reloc_continue;
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}
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/* The rest is copied from bfd_perform_relocation, modified to suit us. */
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if (reloc_entry->address > input_section->_cooked_size)
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return bfd_reloc_outofrange;
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relocation = (symbol->value
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+ symbol->section->output_section->vma
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+ symbol->section->output_offset);
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relocation += reloc_entry->addend;
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relocation -= (input_section->output_section->vma
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+ input_section->output_offset);
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relocation -= (reloc_entry->address & -4L);
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howto = reloc_entry->howto;
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x = bfd_get_16 (abfd, (char *) data + reloc_entry->address);
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relocation >>= howto->rightshift;
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relocation <<= howto->bitpos;
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x = (x & ~howto->dst_mask) | (((x & howto->src_mask) + relocation) & howto->dst_mask);
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bfd_put_16 (abfd, x, (char *) data + reloc_entry->address);
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if ((bfd_signed_vma) relocation < - 0x80
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|| (bfd_signed_vma) relocation > 0x7f)
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return bfd_reloc_overflow;
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else
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return bfd_reloc_ok;
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}
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/* Handle the R_M32R_HI16_SLO reloc.
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This reloc is used in load/store with displacement instructions.
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The lower 16 bits are sign extended when added to the high 16 bytes
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so if the lower 16 bits are negative (bit 15 == 1) then we must add one
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to the high 16 bytes (which will get subtracted off when the low 16 bits
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are added. */
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static bfd_reloc_status_type
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m32r_elf_hi16_slo_reloc (abfd, reloc_entry, symbol, data,
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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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unsigned long x;
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int bit15;
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reloc_howto_type *howto;
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/* This part if from bfd_elf_generic_reloc. */
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if (output_bfd != (bfd *) NULL
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&& (symbol->flags & BSF_SECTION_SYM) == 0
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&& (! reloc_entry->howto->partial_inplace
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|| reloc_entry->addend == 0))
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{
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reloc_entry->address += input_section->output_offset;
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return bfd_reloc_ok;
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}
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if (output_bfd != NULL)
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{
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/* FIXME: See bfd_perform_relocation. Is this right? */
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return bfd_reloc_continue;
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}
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/* The rest is copied from bfd_perform_relocation, modified to suit us. */
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if (reloc_entry->address > input_section->_cooked_size)
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return bfd_reloc_outofrange;
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relocation = (symbol->value
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+ symbol->section->output_section->vma
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+ symbol->section->output_offset);
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relocation += reloc_entry->addend;
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howto = reloc_entry->howto;
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x = bfd_get_32 (abfd, (char *) data + reloc_entry->address);
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bit15 = relocation & 0x8000;
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relocation >>= howto->rightshift;
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if (bit15)
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relocation += 1;
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relocation <<= howto->bitpos;
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x = (x & ~howto->dst_mask) | (((x & howto->src_mask) + relocation) & howto->dst_mask);
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bfd_put_32 (abfd, x, (char *) data + reloc_entry->address);
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return bfd_reloc_ok;
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}
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/* Map BFD reloc types to M32R ELF reloc types. */
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struct m32r_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 m32r_reloc_map m32r_reloc_map[] =
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{
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{ BFD_RELOC_NONE, R_M32R_NONE },
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{ BFD_RELOC_16, R_M32R_16 },
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{ BFD_RELOC_32, R_M32R_32 },
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{ BFD_RELOC_M32R_24, R_M32R_24 },
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{ BFD_RELOC_M32R_10_PCREL, R_M32R_10_PCREL },
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{ BFD_RELOC_M32R_18_PCREL, R_M32R_18_PCREL },
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{ BFD_RELOC_M32R_26_PCREL, R_M32R_26_PCREL },
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{ BFD_RELOC_M32R_HI16_ULO, R_M32R_HI16_ULO },
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{ BFD_RELOC_M32R_HI16_SLO, R_M32R_HI16_SLO },
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{ BFD_RELOC_M32R_LO16, R_M32R_LO16 },
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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 (m32r_reloc_map) / sizeof (struct m32r_reloc_map);
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i++)
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{
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if (m32r_reloc_map[i].bfd_reloc_val == code)
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return &elf_m32r_howto_table[m32r_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 M32R ELF reloc. */
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static void
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m32r_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_M32R_max);
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cache_ptr->howto = &elf_m32r_howto_table[r_type];
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}
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#define ELF_ARCH bfd_arch_m32r
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#define ELF_MACHINE_CODE EM_CYGNUS_M32R
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#define ELF_MAXPAGESIZE 0x1000
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#define TARGET_BIG_SYM bfd_elf32_m32r_vec
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#define TARGET_BIG_NAME "elf32-m32r"
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#define elf_info_to_howto 0
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#define elf_info_to_howto_rel m32r_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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