| 1 | /* Motorola 68HC12-specific support for 32-bit ELF
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| 2 | Copyright 1999, 2000, 2002, 2003 Free Software Foundation, Inc.
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| 3 | Contributed by Stephane Carrez ([email protected])
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| 4 | (Heavily copied from the D10V port by Martin Hunt ([email protected]))
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| 5 |
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| 6 | This file is part of BFD, the Binary File Descriptor library.
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| 7 |
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| 8 | This program is free software; you can redistribute it and/or modify
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| 9 | it under the terms of the GNU General Public License as published by
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| 10 | the Free Software Foundation; either version 2 of the License, or
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| 11 | (at your option) any later version.
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| 12 |
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| 13 | This program is distributed in the hope that it will be useful,
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| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 16 | GNU General Public License for more details.
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| 17 |
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| 18 | You should have received a copy of the GNU General Public License
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| 19 | along with this program; if not, write to the Free Software
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| 20 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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| 21 |
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| 22 | #include "bfd.h"
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| 23 | #include "sysdep.h"
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| 24 | #include "bfdlink.h"
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| 25 | #include "libbfd.h"
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| 26 | #include "elf-bfd.h"
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| 27 | #include "elf32-m68hc1x.h"
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| 28 | #include "elf/m68hc11.h"
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| 29 | #include "opcode/m68hc11.h"
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| 30 |
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| 31 | /* Relocation functions. */
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| 32 | static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
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| 33 | PARAMS ((bfd *, bfd_reloc_code_real_type));
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| 34 | static void m68hc11_info_to_howto_rel
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| 35 | PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
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| 36 |
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| 37 | /* Trampoline generation. */
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| 38 | static bfd_boolean m68hc12_elf_size_one_stub
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| 39 | PARAMS((struct bfd_hash_entry *gen_entry, PTR in_arg));
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| 40 | static bfd_boolean m68hc12_elf_build_one_stub
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| 41 | PARAMS((struct bfd_hash_entry *gen_entry, PTR in_arg));
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| 42 | static struct bfd_link_hash_table* m68hc12_elf_bfd_link_hash_table_create
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| 43 | PARAMS((bfd*));
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| 44 |
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| 45 | static bfd_boolean m68hc12_elf_set_mach_from_flags PARAMS ((bfd *));
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| 46 |
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| 47 | /* Use REL instead of RELA to save space */
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| 48 | #define USE_REL 1
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| 49 |
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| 50 | /* The 68HC12 microcontroler has a memory bank switching system
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| 51 | with a 16Kb window in the 64Kb address space. The extended memory
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| 52 | is mapped in the 16Kb window (at 0x8000). The page register controls
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| 53 | which 16Kb bank is mapped. The call/rtc instructions take care of
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| 54 | bank switching in function calls/returns.
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| 55 |
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| 56 | For GNU Binutils to work, we consider there is a physical memory
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| 57 | at 0..0x0ffff and a kind of virtual memory above that. Symbols
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| 58 | in virtual memory have their addresses treated in a special way
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| 59 | when disassembling and when linking.
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| 60 |
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| 61 | For the linker to work properly, we must always relocate the virtual
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| 62 | memory as if it is mapped at 0x8000. When a 16-bit relocation is
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| 63 | made in the virtual memory, we check that it does not cross the
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| 64 | memory bank where it is used. This would involve a page change
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| 65 | which would be wrong. The 24-bit relocation is for that and it
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| 66 | treats the address as a physical address + page number.
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| 67 |
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| 68 |
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| 69 | Banked
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| 70 | Address Space
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| 71 | | | Page n
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| 72 | +---------------+ 0x1010000
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| 73 | | |
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| 74 | | jsr _foo |
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| 75 | | .. | Page 3
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| 76 | | _foo: |
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| 77 | +---------------+ 0x100C000
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| 78 | | |
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| 79 | | call _bar |
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| 80 | | .. | Page 2
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| 81 | | _bar: |
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| 82 | +---------------+ 0x1008000
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| 83 | /------>| |
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| 84 | | | call _foo | Page 1
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| 85 | | | |
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| 86 | | +---------------+ 0x1004000
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| 87 | Physical | | |
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| 88 | Address Space | | | Page 0
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| 89 | | | |
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| 90 | +-----------+ 0x00FFFF | +---------------+ 0x1000000
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| 91 | | | |
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| 92 | | call _foo | |
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| 93 | | | |
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| 94 | +-----------+ 0x00BFFF -+---/
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| 95 | | | |
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| 96 | | | |
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| 97 | | | 16K |
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| 98 | | | |
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| 99 | +-----------+ 0x008000 -+
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| 100 | | |
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| 101 | | |
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| 102 | = =
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| 103 | | |
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| 104 | | |
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| 105 | +-----------+ 0000
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| 106 |
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| 107 |
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| 108 | The 'call _foo' must be relocated with page 3 and 16-bit address
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| 109 | mapped at 0x8000.
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| 110 |
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| 111 | The 3-bit and 16-bit PC rel relocation is only used by 68HC12. */
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| 112 | static reloc_howto_type elf_m68hc11_howto_table[] = {
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| 113 | /* This reloc does nothing. */
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| 114 | HOWTO (R_M68HC11_NONE, /* type */
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| 115 | 0, /* rightshift */
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| 116 | 2, /* size (0 = byte, 1 = short, 2 = long) */
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| 117 | 32, /* bitsize */
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| 118 | FALSE, /* pc_relative */
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| 119 | 0, /* bitpos */
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| 120 | complain_overflow_dont,/* complain_on_overflow */
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| 121 | bfd_elf_generic_reloc, /* special_function */
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| 122 | "R_M68HC12_NONE", /* name */
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| 123 | FALSE, /* partial_inplace */
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| 124 | 0, /* src_mask */
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| 125 | 0, /* dst_mask */
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| 126 | FALSE), /* pcrel_offset */
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| 127 |
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| 128 | /* A 8 bit absolute relocation */
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| 129 | HOWTO (R_M68HC11_8, /* type */
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| 130 | 0, /* rightshift */
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| 131 | 0, /* size (0 = byte, 1 = short, 2 = long) */
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| 132 | 8, /* bitsize */
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| 133 | FALSE, /* pc_relative */
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| 134 | 0, /* bitpos */
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| 135 | complain_overflow_bitfield, /* complain_on_overflow */
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| 136 | bfd_elf_generic_reloc, /* special_function */
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| 137 | "R_M68HC12_8", /* name */
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| 138 | FALSE, /* partial_inplace */
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| 139 | 0x00ff, /* src_mask */
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| 140 | 0x00ff, /* dst_mask */
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| 141 | FALSE), /* pcrel_offset */
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| 142 |
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| 143 | /* A 8 bit absolute relocation (upper address) */
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| 144 | HOWTO (R_M68HC11_HI8, /* type */
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| 145 | 8, /* rightshift */
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| 146 | 0, /* size (0 = byte, 1 = short, 2 = long) */
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| 147 | 8, /* bitsize */
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| 148 | FALSE, /* pc_relative */
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| 149 | 0, /* bitpos */
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| 150 | complain_overflow_bitfield, /* complain_on_overflow */
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| 151 | bfd_elf_generic_reloc, /* special_function */
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| 152 | "R_M68HC12_HI8", /* name */
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