3f533aa9ec
(elf_backend_special_sections): Define.a PR savannah/4950: * elf32-m68hc11.c (elf32_m68hc11_special_sections): The .vectors section is read-only.
590 lines
18 KiB
C
590 lines
18 KiB
C
/* Motorola 68HC12-specific support for 32-bit ELF
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Copyright 1999, 2000, 2002, 2003 Free Software Foundation, Inc.
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Contributed by Stephane Carrez (stcarrez@nerim.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 "bfdlink.h"
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#include "libbfd.h"
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#include "elf-bfd.h"
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#include "elf32-m68hc1x.h"
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#include "elf/m68hc11.h"
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#include "opcode/m68hc11.h"
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/* Relocation functions. */
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static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
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PARAMS ((bfd *, bfd_reloc_code_real_type));
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static void m68hc11_info_to_howto_rel
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PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
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/* Trampoline generation. */
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static bfd_boolean m68hc12_elf_size_one_stub
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PARAMS((struct bfd_hash_entry *gen_entry, PTR in_arg));
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static bfd_boolean m68hc12_elf_build_one_stub
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PARAMS((struct bfd_hash_entry *gen_entry, PTR in_arg));
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static struct bfd_link_hash_table* m68hc12_elf_bfd_link_hash_table_create
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PARAMS((bfd*));
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static bfd_boolean m68hc12_elf_set_mach_from_flags PARAMS ((bfd *));
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/* Use REL instead of RELA to save space */
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#define USE_REL 1
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/* The 68HC12 microcontroler has a memory bank switching system
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with a 16Kb window in the 64Kb address space. The extended memory
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is mapped in the 16Kb window (at 0x8000). The page register controls
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which 16Kb bank is mapped. The call/rtc instructions take care of
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bank switching in function calls/returns.
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For GNU Binutils to work, we consider there is a physical memory
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at 0..0x0ffff and a kind of virtual memory above that. Symbols
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in virtual memory have their addresses treated in a special way
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when disassembling and when linking.
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For the linker to work properly, we must always relocate the virtual
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memory as if it is mapped at 0x8000. When a 16-bit relocation is
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made in the virtual memory, we check that it does not cross the
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memory bank where it is used. This would involve a page change
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which would be wrong. The 24-bit relocation is for that and it
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treats the address as a physical address + page number.
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Banked
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Address Space
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| | Page n
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+---------------+ 0x1010000
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| |
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| jsr _foo |
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| .. | Page 3
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| _foo: |
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+---------------+ 0x100C000
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| |
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| call _bar |
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| .. | Page 2
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| _bar: |
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+---------------+ 0x1008000
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/------>| |
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| | call _foo | Page 1
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| | |
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| +---------------+ 0x1004000
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Physical | | |
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Address Space | | | Page 0
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| | |
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+-----------+ 0x00FFFF | +---------------+ 0x1000000
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| | |
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| call _foo | |
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| | |
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+-----------+ 0x00BFFF -+---/
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| | |
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| | 16K |
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+-----------+ 0x008000 -+
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| |
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= =
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| |
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+-----------+ 0000
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The 'call _foo' must be relocated with page 3 and 16-bit address
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mapped at 0x8000.
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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_dont,/* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_M68HC12_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_M68HC12_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_M68HC12_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_M68HC12_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_M68HC12_PCREL_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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TRUE), /* 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_M68HC12_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_M68HC12_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_M68HC12_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_M68HC12_PCREL_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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TRUE), /* 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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/* A 24 bit relocation */
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HOWTO (R_M68HC11_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_dont, /* complain_on_overflow */
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m68hc11_elf_special_reloc, /* special_function */
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"R_M68HC12_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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/* A 16-bit low relocation */
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HOWTO (R_M68HC11_LO16, /* 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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m68hc11_elf_special_reloc,/* special_function */
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"R_M68HC12_LO16", /* 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 page relocation */
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HOWTO (R_M68HC11_PAGE, /* 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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m68hc11_elf_special_reloc,/* special_function */
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"R_M68HC12_PAGE", /* 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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EMPTY_HOWTO (14),
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EMPTY_HOWTO (15),
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EMPTY_HOWTO (16),
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EMPTY_HOWTO (17),
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EMPTY_HOWTO (18),
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EMPTY_HOWTO (19),
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/* Mark beginning of a jump instruction (any form). */
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HOWTO (R_M68HC11_RL_JUMP, /* 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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m68hc11_elf_ignore_reloc, /* special_function */
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"R_M68HC12_RL_JUMP", /* name */
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TRUE, /* partial_inplace */
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0, /* src_mask */
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0, /* dst_mask */
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TRUE), /* pcrel_offset */
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/* Mark beginning of Gcc relaxation group instruction. */
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HOWTO (R_M68HC11_RL_GROUP, /* 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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m68hc11_elf_ignore_reloc, /* special_function */
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"R_M68HC12_RL_GROUP", /* name */
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TRUE, /* partial_inplace */
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0, /* src_mask */
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0, /* dst_mask */
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TRUE), /* 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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{BFD_RELOC_VTABLE_INHERIT, R_M68HC11_GNU_VTINHERIT},
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{BFD_RELOC_VTABLE_ENTRY, R_M68HC11_GNU_VTENTRY},
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{BFD_RELOC_M68HC11_LO16, R_M68HC11_LO16},
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{BFD_RELOC_M68HC11_PAGE, R_M68HC11_PAGE},
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{BFD_RELOC_M68HC11_24, R_M68HC11_24},
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{BFD_RELOC_M68HC11_RL_JUMP, R_M68HC11_RL_JUMP},
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{BFD_RELOC_M68HC11_RL_GROUP, R_M68HC11_RL_GROUP},
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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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Elf_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_M68HC11_max);
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cache_ptr->howto = &elf_m68hc11_howto_table[r_type];
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}
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/* Far trampoline generation. */
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/* Build a 68HC12 trampoline stub. */
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static bfd_boolean
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m68hc12_elf_build_one_stub (gen_entry, in_arg)
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struct bfd_hash_entry *gen_entry;
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PTR in_arg;
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{
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struct elf32_m68hc11_stub_hash_entry *stub_entry;
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struct bfd_link_info *info;
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struct m68hc11_elf_link_hash_table *htab;
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asection *stub_sec;
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bfd *stub_bfd;
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bfd_byte *loc;
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bfd_vma sym_value, phys_page, phys_addr;
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/* Massage our args to the form they really have. */
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stub_entry = (struct elf32_m68hc11_stub_hash_entry *) gen_entry;
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info = (struct bfd_link_info *) in_arg;
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htab = m68hc11_elf_hash_table (info);
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stub_sec = stub_entry->stub_sec;
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/* Make a note of the offset within the stubs for this entry. */
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stub_entry->stub_offset = stub_sec->_raw_size;
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stub_sec->_raw_size += 7;
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loc = stub_sec->contents + stub_entry->stub_offset;
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stub_bfd = stub_sec->owner;
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/* Create the trampoline call stub:
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ldy #%addr(symbol)
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call %page(symbol), __trampoline
|
||
|
||
*/
|
||
sym_value = (stub_entry->target_value
|
||
+ stub_entry->target_section->output_offset
|
||
+ stub_entry->target_section->output_section->vma);
|
||
phys_addr = m68hc11_phys_addr (&htab->pinfo, sym_value);
|
||
phys_page = m68hc11_phys_page (&htab->pinfo, sym_value);
|
||
|
||
/* ldy #%page(sym) */
|
||
bfd_put_8 (stub_bfd, 0xCD, loc);
|
||
bfd_put_16 (stub_bfd, phys_addr, loc + 1);
|
||
loc += 3;
|
||
|
||
/* call %page(sym), __trampoline */
|
||
bfd_put_8 (stub_bfd, 0x4a, loc);
|
||
bfd_put_16 (stub_bfd, htab->pinfo.trampoline_addr, loc + 1);
|
||
bfd_put_8 (stub_bfd, phys_page, loc + 3);
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* As above, but don't actually build the stub. Just bump offset so
|
||
we know stub section sizes. */
|
||
|
||
static bfd_boolean
|
||
m68hc12_elf_size_one_stub (gen_entry, in_arg)
|
||
struct bfd_hash_entry *gen_entry;
|
||
PTR in_arg ATTRIBUTE_UNUSED;
|
||
{
|
||
struct elf32_m68hc11_stub_hash_entry *stub_entry;
|
||
|
||
/* Massage our args to the form they really have. */
|
||
stub_entry = (struct elf32_m68hc11_stub_hash_entry *) gen_entry;
|
||
|
||
stub_entry->stub_sec->_raw_size += 7;
|
||
return TRUE;
|
||
}
|
||
|
||
/* Create a 68HC12 ELF linker hash table. */
|
||
|
||
static struct bfd_link_hash_table *
|
||
m68hc12_elf_bfd_link_hash_table_create (abfd)
|
||
bfd *abfd;
|
||
{
|
||
struct m68hc11_elf_link_hash_table *ret;
|
||
|
||
ret = m68hc11_elf_hash_table_create (abfd);
|
||
if (ret == (struct m68hc11_elf_link_hash_table *) NULL)
|
||
return NULL;
|
||
|
||
ret->size_one_stub = m68hc12_elf_size_one_stub;
|
||
ret->build_one_stub = m68hc12_elf_build_one_stub;
|
||
|
||
return &ret->root.root;
|
||
}
|
||
|
||
static bfd_boolean
|
||
m68hc12_elf_set_mach_from_flags (abfd)
|
||
bfd *abfd;
|
||
{
|
||
flagword flags = elf_elfheader (abfd)->e_flags;
|
||
|
||
switch (flags & EF_M68HC11_MACH_MASK)
|
||
{
|
||
case EF_M68HC12_MACH:
|
||
bfd_default_set_arch_mach (abfd, bfd_arch_m68hc12, bfd_mach_m6812);
|
||
break;
|
||
case EF_M68HCS12_MACH:
|
||
bfd_default_set_arch_mach (abfd, bfd_arch_m68hc12, bfd_mach_m6812s);
|
||
break;
|
||
case EF_M68HC11_GENERIC:
|
||
bfd_default_set_arch_mach (abfd, bfd_arch_m68hc12,
|
||
bfd_mach_m6812_default);
|
||
break;
|
||
default:
|
||
return FALSE;
|
||
}
|
||
return TRUE;
|
||
}
|
||
|
||
/* Specific sections:
|
||
- The .page0 is a data section that is mapped in [0x0000..0x00FF].
|
||
Page0 accesses are faster on the M68HC12.
|
||
- The .vectors is the section that represents the interrupt
|
||
vectors. */
|
||
static struct bfd_elf_special_section const elf32_m68hc12_special_sections[]=
|
||
{
|
||
{ ".eeprom", 0, NULL, 0,
|
||
SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
|
||
{ ".softregs", 0, NULL, 0,
|
||
SHT_NOBITS, SHF_ALLOC + SHF_WRITE },
|
||
{ ".page0", 0, NULL, 0,
|
||
SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
|
||
{ ".vectors", 0, NULL, 0,
|
||
SHT_PROGBITS, SHF_ALLOC },
|
||
{ NULL, 0, NULL, 0,
|
||
0, 0 }
|
||
};
|
||
|
||
#define ELF_ARCH bfd_arch_m68hc12
|
||
#define ELF_MACHINE_CODE EM_68HC12
|
||
#define ELF_MAXPAGESIZE 0x1000
|
||
|
||
#define TARGET_BIG_SYM bfd_elf32_m68hc12_vec
|
||
#define TARGET_BIG_NAME "elf32-m68hc12"
|
||
|
||
#define elf_info_to_howto 0
|
||
#define elf_info_to_howto_rel m68hc11_info_to_howto_rel
|
||
#define elf_backend_gc_mark_hook elf32_m68hc11_gc_mark_hook
|
||
#define elf_backend_gc_sweep_hook elf32_m68hc11_gc_sweep_hook
|
||
#define elf_backend_check_relocs elf32_m68hc11_check_relocs
|
||
#define elf_backend_relocate_section elf32_m68hc11_relocate_section
|
||
#define elf_backend_object_p m68hc12_elf_set_mach_from_flags
|
||
#define elf_backend_final_write_processing 0
|
||
#define elf_backend_can_gc_sections 1
|
||
#define elf_backend_special_sections elf32_m68hc12_special_sections
|
||
#define elf_backend_post_process_headers elf32_m68hc11_post_process_headers
|
||
#define elf_backend_add_symbol_hook elf32_m68hc11_add_symbol_hook
|
||
|
||
#define bfd_elf32_bfd_link_hash_table_create \
|
||
m68hc12_elf_bfd_link_hash_table_create
|
||
#define bfd_elf32_bfd_link_hash_table_free \
|
||
m68hc11_elf_bfd_link_hash_table_free
|
||
#define bfd_elf32_bfd_merge_private_bfd_data \
|
||
_bfd_m68hc11_elf_merge_private_bfd_data
|
||
#define bfd_elf32_bfd_set_private_flags _bfd_m68hc11_elf_set_private_flags
|
||
#define bfd_elf32_bfd_print_private_bfd_data \
|
||
_bfd_m68hc11_elf_print_private_bfd_data
|
||
|
||
#include "elf32-target.h"
|