281 lines
8.9 KiB
C
281 lines
8.9 KiB
C
/* Motorola 68HC12-specific support for 32-bit ELF
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Copyright (C) 1999, 2000 Free Software Foundation, Inc.
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Contributed by Stephane Carrez (stcarrez@worldnet.fr)
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(Heavily copied from the D10V port 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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#include "elf/m68hc11.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 m68hc11_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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/* The Motorola 68HC11 microcontroler only addresses 64Kb.
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We must handle 8 and 16-bit relocations. The 32-bit relocation
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is defined but not used except by gas when -gstabs is used (which
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is wrong).
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The 3-bit and 16-bit PC rel relocation is only used by 68HC12. */
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static reloc_howto_type elf_m68hc11_howto_table[] = {
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/* This reloc does nothing. */
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HOWTO (R_M68HC11_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_M68HC11_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 8 bit absolute relocation */
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HOWTO (R_M68HC11_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_M68HC11_8", /* name */
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false, /* partial_inplace */
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0x00ff, /* src_mask */
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0x00ff, /* dst_mask */
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false), /* pcrel_offset */
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/* A 8 bit absolute relocation (upper address) */
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HOWTO (R_M68HC11_HI8, /* type */
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8, /* 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_M68HC11_HI8", /* name */
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false, /* partial_inplace */
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0x00ff, /* src_mask */
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0x00ff, /* dst_mask */
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false), /* pcrel_offset */
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/* A 8 bit absolute relocation (upper address) */
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HOWTO (R_M68HC11_LO8, /* 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_dont, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_M68HC11_LO8", /* name */
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false, /* partial_inplace */
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0x00ff, /* src_mask */
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0x00ff, /* dst_mask */
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false), /* pcrel_offset */
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/* A 8 bit PC-rel relocation */
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HOWTO (R_M68HC11_PCREL_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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true, /* 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_M68HC11_PCREL_8", /* name */
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false, /* partial_inplace */
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0x0, /* 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_M68HC11_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_dont /*bitfield */ , /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_M68HC11_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. This one is never used for the
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code relocation. It's used by gas for -gstabs generation. */
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HOWTO (R_M68HC11_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_M68HC11_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 3 bit absolute relocation */
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HOWTO (R_M68HC11_3B, /* type */
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0, /* rightshift */
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0, /* size (0 = byte, 1 = short, 2 = long) */
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3, /* 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_M68HC11_4B", /* name */
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false, /* partial_inplace */
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0x003, /* src_mask */
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0x003, /* dst_mask */
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false), /* pcrel_offset */
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/* A 16 bit PC-rel relocation */
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HOWTO (R_M68HC11_PCREL_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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true, /* 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_M68HC11_PCREL_16", /* name */
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false, /* partial_inplace */
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0x0, /* src_mask */
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0xffff, /* 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_M68HC11_GNU_VTINHERIT, /* type */
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0, /* rightshift */
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1, /* 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_M68HC11_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_M68HC11_GNU_VTENTRY, /* type */
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0, /* rightshift */
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1, /* 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_M68HC11_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 M68HC11 ELF reloc types. */
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struct m68hc11_reloc_map
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{
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bfd_reloc_code_real_type bfd_reloc_val;
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unsigned char elf_reloc_val;
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};
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static const struct m68hc11_reloc_map m68hc11_reloc_map[] = {
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{BFD_RELOC_NONE, R_M68HC11_NONE,},
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{BFD_RELOC_8, R_M68HC11_8},
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{BFD_RELOC_M68HC11_HI8, R_M68HC11_HI8},
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{BFD_RELOC_M68HC11_LO8, R_M68HC11_LO8},
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{BFD_RELOC_8_PCREL, R_M68HC11_PCREL_8},
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{BFD_RELOC_16_PCREL, R_M68HC11_PCREL_16},
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{BFD_RELOC_16, R_M68HC11_16},
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{BFD_RELOC_32, R_M68HC11_32},
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{BFD_RELOC_M68HC11_3B, R_M68HC11_3B},
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/* The following relocs are defined but they probably don't work yet. */
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{BFD_RELOC_VTABLE_INHERIT, R_M68HC11_GNU_VTINHERIT},
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{BFD_RELOC_VTABLE_ENTRY, R_M68HC11_GNU_VTENTRY},
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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 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 = 0;
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i < sizeof (m68hc11_reloc_map) / sizeof (struct m68hc11_reloc_map);
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i++)
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{
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if (m68hc11_reloc_map[i].bfd_reloc_val == code)
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return &elf_m68hc11_howto_table[m68hc11_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 M68HC11 ELF reloc. */
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static void
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m68hc11_info_to_howto_rel (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_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_M68HC11_max);
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cache_ptr->howto = &elf_m68hc11_howto_table[r_type];
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}
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/* Below is the only difference between elf32-m68hc12.c and elf32-m68hc11.c.
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The Motorola spec says to use a different Elf machine code. */
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#define ELF_ARCH bfd_arch_m68hc12
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#define ELF_MACHINE_CODE EM_68HC12
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#define ELF_MAXPAGESIZE 0x1000
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#define TARGET_BIG_SYM bfd_elf32_m68hc12_vec
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#define TARGET_BIG_NAME "elf32-m68hc12"
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#define elf_info_to_howto 0
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#define elf_info_to_howto_rel m68hc11_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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