| 1 | /* Motorola 68HC11-specific support for 32-bit ELF |
| 2 | Copyright 1999, 2000 Free Software Foundation, Inc. |
| 3 | Contributed by Stephane Carrez (stcarrez@worldnet.fr) |
| 4 | (Heavily copied from the D10V port by Martin Hunt (hunt@cygnus.com)) |
| 5 | |
| 6 | This file is part of BFD, the Binary File Descriptor library. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 2 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 21 | |
| 22 | #include "bfd.h" |
| 23 | #include "sysdep.h" |
| 24 | #include "libbfd.h" |
| 25 | #include "elf-bfd.h" |
| 26 | #include "elf/m68hc11.h" |
| 27 | |
| 28 | static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup |
| 29 | PARAMS ((bfd * abfd, bfd_reloc_code_real_type code)); |
| 30 | static void m68hc11_info_to_howto_rel |
| 31 | PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *)); |
| 32 | |
| 33 | /* Use REL instead of RELA to save space */ |
| 34 | #define USE_REL |
| 35 | |
| 36 | /* The Motorola 68HC11 microcontroler only addresses 64Kb. |
| 37 | We must handle 8 and 16-bit relocations. The 32-bit relocation |
| 38 | is defined but not used except by gas when -gstabs is used (which |
| 39 | is wrong). |
| 40 | The 3-bit and 16-bit PC rel relocation is only used by 68HC12. */ |
| 41 | static reloc_howto_type elf_m68hc11_howto_table[] = { |
| 42 | /* This reloc does nothing. */ |
| 43 | HOWTO (R_M68HC11_NONE, /* type */ |
| 44 | 0, /* rightshift */ |
| 45 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 46 | 32, /* bitsize */ |
| 47 | false, /* pc_relative */ |
| 48 | 0, /* bitpos */ |
| 49 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 50 | bfd_elf_generic_reloc, /* special_function */ |
| 51 | "R_M68HC11_NONE", /* name */ |
| 52 | false, /* partial_inplace */ |
| 53 | 0, /* src_mask */ |
| 54 | 0, /* dst_mask */ |
| 55 | false), /* pcrel_offset */ |
| 56 | |
| 57 | /* A 8 bit absolute relocation */ |
| 58 | HOWTO (R_M68HC11_8, /* type */ |
| 59 | 0, /* rightshift */ |
| 60 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 61 | 8, /* bitsize */ |
| 62 | false, /* pc_relative */ |
| 63 | 0, /* bitpos */ |
| 64 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 65 | bfd_elf_generic_reloc, /* special_function */ |
| 66 | "R_M68HC11_8", /* name */ |
| 67 | false, /* partial_inplace */ |
| 68 | 0x00ff, /* src_mask */ |
| 69 | 0x00ff, /* dst_mask */ |
| 70 | false), /* pcrel_offset */ |
| 71 | |
| 72 | /* A 8 bit absolute relocation (upper address) */ |
| 73 | HOWTO (R_M68HC11_HI8, /* type */ |
| 74 | 8, /* rightshift */ |
| 75 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 76 | 8, /* bitsize */ |
| 77 | false, /* pc_relative */ |
| 78 | 0, /* bitpos */ |
| 79 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 80 | bfd_elf_generic_reloc, /* special_function */ |
| 81 | "R_M68HC11_HI8", /* name */ |
| 82 | false, /* partial_inplace */ |
| 83 | 0x00ff, /* src_mask */ |
| 84 | 0x00ff, /* dst_mask */ |
| 85 | false), /* pcrel_offset */ |
| 86 | |
| 87 | /* A 8 bit absolute relocation (upper address) */ |
| 88 | HOWTO (R_M68HC11_LO8, /* type */ |
| 89 | 0, /* rightshift */ |
| 90 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 91 | 8, /* bitsize */ |
| 92 | false, /* pc_relative */ |
| 93 | 0, /* bitpos */ |
| 94 | complain_overflow_dont, /* complain_on_overflow */ |
| 95 | bfd_elf_generic_reloc, /* special_function */ |
| 96 | "R_M68HC11_LO8", /* name */ |
| 97 | false, /* partial_inplace */ |
| 98 | 0x00ff, /* src_mask */ |
| 99 | 0x00ff, /* dst_mask */ |
| 100 | false), /* pcrel_offset */ |
| 101 | |
| 102 | /* A 8 bit PC-rel relocation */ |
| 103 | HOWTO (R_M68HC11_PCREL_8, /* type */ |
| 104 | 0, /* rightshift */ |
| 105 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 106 | 8, /* bitsize */ |
| 107 | true, /* pc_relative */ |
| 108 | 0, /* bitpos */ |
| 109 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 110 | bfd_elf_generic_reloc, /* special_function */ |
| 111 | "R_M68HC11_PCREL_8", /* name */ |
| 112 | false, /* partial_inplace */ |
| 113 | 0x0, /* src_mask */ |
| 114 | 0x00ff, /* dst_mask */ |
| 115 | false), /* pcrel_offset */ |
| 116 | |
| 117 | /* A 16 bit absolute relocation */ |
| 118 | HOWTO (R_M68HC11_16, /* type */ |
| 119 | 0, /* rightshift */ |
| 120 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 121 | 16, /* bitsize */ |
| 122 | false, /* pc_relative */ |
| 123 | 0, /* bitpos */ |
| 124 | complain_overflow_dont /*bitfield */ , /* complain_on_overflow */ |
| 125 | bfd_elf_generic_reloc, /* special_function */ |
| 126 | "R_M68HC11_16", /* name */ |
| 127 | false, /* partial_inplace */ |
| 128 | 0xffff, /* src_mask */ |
| 129 | 0xffff, /* dst_mask */ |
| 130 | false), /* pcrel_offset */ |
| 131 | |
| 132 | /* A 32 bit absolute relocation. This one is never used for the |
| 133 | code relocation. It's used by gas for -gstabs generation. */ |
| 134 | HOWTO (R_M68HC11_32, /* type */ |
| 135 | 0, /* rightshift */ |
| 136 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 137 | 32, /* bitsize */ |
| 138 | false, /* pc_relative */ |
| 139 | 0, /* bitpos */ |
| 140 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 141 | bfd_elf_generic_reloc, /* special_function */ |
| 142 | "R_M68HC11_32", /* name */ |
| 143 | false, /* partial_inplace */ |
| 144 | 0xffffffff, /* src_mask */ |
| 145 | 0xffffffff, /* dst_mask */ |
| 146 | false), /* pcrel_offset */ |
| 147 | |
| 148 | /* A 3 bit absolute relocation */ |
| 149 | HOWTO (R_M68HC11_3B, /* type */ |
| 150 | 0, /* rightshift */ |
| 151 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 152 | 3, /* bitsize */ |
| 153 | false, /* pc_relative */ |
| 154 | 0, /* bitpos */ |
| 155 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 156 | bfd_elf_generic_reloc, /* special_function */ |
| 157 | "R_M68HC11_4B", /* name */ |
| 158 | false, /* partial_inplace */ |
| 159 | 0x003, /* src_mask */ |
| 160 | 0x003, /* dst_mask */ |
| 161 | false), /* pcrel_offset */ |
| 162 | |
| 163 | /* A 16 bit PC-rel relocation */ |
| 164 | HOWTO (R_M68HC11_PCREL_16, /* type */ |
| 165 | 0, /* rightshift */ |
| 166 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 167 | 16, /* bitsize */ |
| 168 | true, /* pc_relative */ |
| 169 | 0, /* bitpos */ |
| 170 | complain_overflow_dont, /* complain_on_overflow */ |
| 171 | bfd_elf_generic_reloc, /* special_function */ |
| 172 | "R_M68HC11_PCREL_16", /* name */ |
| 173 | false, /* partial_inplace */ |
| 174 | 0x0, /* src_mask */ |
| 175 | 0xffff, /* dst_mask */ |
| 176 | false), /* pcrel_offset */ |
| 177 | |
| 178 | /* GNU extension to record C++ vtable hierarchy */ |
| 179 | HOWTO (R_M68HC11_GNU_VTINHERIT, /* type */ |
| 180 | 0, /* rightshift */ |
| 181 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 182 | 0, /* bitsize */ |
| 183 | false, /* pc_relative */ |
| 184 | 0, /* bitpos */ |
| 185 | complain_overflow_dont, /* complain_on_overflow */ |
| 186 | NULL, /* special_function */ |
| 187 | "R_M68HC11_GNU_VTINHERIT", /* name */ |
| 188 | false, /* partial_inplace */ |
| 189 | 0, /* src_mask */ |
| 190 | 0, /* dst_mask */ |
| 191 | false), /* pcrel_offset */ |
| 192 | |
| 193 | /* GNU extension to record C++ vtable member usage */ |
| 194 | HOWTO (R_M68HC11_GNU_VTENTRY, /* type */ |
| 195 | 0, /* rightshift */ |
| 196 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 197 | 0, /* bitsize */ |
| 198 | false, /* pc_relative */ |
| 199 | 0, /* bitpos */ |
| 200 | complain_overflow_dont, /* complain_on_overflow */ |
| 201 | _bfd_elf_rel_vtable_reloc_fn, /* special_function */ |
| 202 | "R_M68HC11_GNU_VTENTRY", /* name */ |
| 203 | false, /* partial_inplace */ |
| 204 | 0, /* src_mask */ |
| 205 | 0, /* dst_mask */ |
| 206 | false), /* pcrel_offset */ |
| 207 | }; |
| 208 | |
| 209 | /* Map BFD reloc types to M68HC11 ELF reloc types. */ |
| 210 | |
| 211 | struct m68hc11_reloc_map |
| 212 | { |
| 213 | bfd_reloc_code_real_type bfd_reloc_val; |
| 214 | unsigned char elf_reloc_val; |
| 215 | }; |
| 216 | |
| 217 | static const struct m68hc11_reloc_map m68hc11_reloc_map[] = { |
| 218 | {BFD_RELOC_NONE, R_M68HC11_NONE,}, |
| 219 | {BFD_RELOC_8, R_M68HC11_8}, |
| 220 | {BFD_RELOC_M68HC11_HI8, R_M68HC11_HI8}, |
| 221 | {BFD_RELOC_M68HC11_LO8, R_M68HC11_LO8}, |
| 222 | {BFD_RELOC_8_PCREL, R_M68HC11_PCREL_8}, |
| 223 | {BFD_RELOC_16_PCREL, R_M68HC11_PCREL_16}, |
| 224 | {BFD_RELOC_16, R_M68HC11_16}, |
| 225 | {BFD_RELOC_32, R_M68HC11_32}, |
| 226 | {BFD_RELOC_M68HC11_3B, R_M68HC11_3B}, |
| 227 | |
| 228 | /* The following relocs are defined but they probably don't work yet. */ |
| 229 | {BFD_RELOC_VTABLE_INHERIT, R_M68HC11_GNU_VTINHERIT}, |
| 230 | {BFD_RELOC_VTABLE_ENTRY, R_M68HC11_GNU_VTENTRY}, |
| 231 | }; |
| 232 | |
| 233 | static reloc_howto_type * |
| 234 | bfd_elf32_bfd_reloc_type_lookup (abfd, code) |
| 235 | bfd *abfd ATTRIBUTE_UNUSED; |
| 236 | bfd_reloc_code_real_type code; |
| 237 | { |
| 238 | unsigned int i; |
| 239 | |
| 240 | for (i = 0; |
| 241 | i < sizeof (m68hc11_reloc_map) / sizeof (struct m68hc11_reloc_map); |
| 242 | i++) |
| 243 | { |
| 244 | if (m68hc11_reloc_map[i].bfd_reloc_val == code) |
| 245 | return &elf_m68hc11_howto_table[m68hc11_reloc_map[i].elf_reloc_val]; |
| 246 | } |
| 247 | |
| 248 | return NULL; |
| 249 | } |
| 250 | |
| 251 | /* Set the howto pointer for an M68HC11 ELF reloc. */ |
| 252 | |
| 253 | static void |
| 254 | m68hc11_info_to_howto_rel (abfd, cache_ptr, dst) |
| 255 | bfd *abfd ATTRIBUTE_UNUSED; |
| 256 | arelent *cache_ptr; |
| 257 | Elf32_Internal_Rel *dst; |
| 258 | { |
| 259 | unsigned int r_type; |
| 260 | |
| 261 | r_type = ELF32_R_TYPE (dst->r_info); |
| 262 | BFD_ASSERT (r_type < (unsigned int) R_M68HC11_max); |
| 263 | cache_ptr->howto = &elf_m68hc11_howto_table[r_type]; |
| 264 | } |
| 265 | |
| 266 | /* Below is the only difference between elf32-m68hc12.c and elf32-m68hc11.c. |
| 267 | The Motorola spec says to use a different Elf machine code. */ |
| 268 | #define ELF_ARCH bfd_arch_m68hc11 |
| 269 | #define ELF_MACHINE_CODE EM_68HC11 |
| 270 | #define ELF_MAXPAGESIZE 0x1000 |
| 271 | |
| 272 | #define TARGET_BIG_SYM bfd_elf32_m68hc11_vec |
| 273 | #define TARGET_BIG_NAME "elf32-m68hc11" |
| 274 | |
| 275 | #define elf_info_to_howto 0 |
| 276 | #define elf_info_to_howto_rel m68hc11_info_to_howto_rel |
| 277 | #define elf_backend_object_p 0 |
| 278 | #define elf_backend_final_write_processing 0 |
| 279 | |
| 280 | #include "elf32-target.h" |