| 1 | /* Motorola 68HC12-specific support for 32-bit ELF |
| 2 | Copyright 1999, 2000, 2002 Free Software Foundation, Inc. |
| 3 | Contributed by Stephane Carrez (stcarrez@nerim.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 | #include "opcode/m68hc11.h" |
| 28 | |
| 29 | static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup |
| 30 | PARAMS ((bfd *, bfd_reloc_code_real_type)); |
| 31 | static void m68hc11_info_to_howto_rel |
| 32 | PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *)); |
| 33 | |
| 34 | static bfd_reloc_status_type m68hc11_elf_ignore_reloc |
| 35 | PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); |
| 36 | static bfd_reloc_status_type m68hc12_elf_special_reloc |
| 37 | PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); |
| 38 | static int m68hc12_addr_is_banked PARAMS ((bfd_vma)); |
| 39 | static bfd_vma m68hc12_phys_addr PARAMS ((bfd_vma)); |
| 40 | static bfd_vma m68hc12_phys_page PARAMS ((bfd_vma)); |
| 41 | |
| 42 | /* GC mark and sweep. */ |
| 43 | static asection *elf32_m68hc11_gc_mark_hook |
| 44 | PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *, |
| 45 | struct elf_link_hash_entry *, Elf_Internal_Sym *)); |
| 46 | static boolean elf32_m68hc11_gc_sweep_hook |
| 47 | PARAMS ((bfd *, struct bfd_link_info *, asection *, |
| 48 | const Elf_Internal_Rela *)); |
| 49 | |
| 50 | boolean _bfd_m68hc12_elf_merge_private_bfd_data PARAMS ((bfd *, bfd *)); |
| 51 | boolean _bfd_m68hc12_elf_set_private_flags PARAMS ((bfd *, flagword)); |
| 52 | boolean _bfd_m68hc12_elf_print_private_bfd_data PARAMS ((bfd *, PTR)); |
| 53 | |
| 54 | |
| 55 | |
| 56 | /* Use REL instead of RELA to save space */ |
| 57 | #define USE_REL |
| 58 | |
| 59 | /* The Motorola 68HC11 microcontroler only addresses 64Kb. |
| 60 | We must handle 8 and 16-bit relocations. The 32-bit relocation |
| 61 | is defined but not used except by gas when -gstabs is used (which |
| 62 | is wrong). |
| 63 | |
| 64 | The 68HC12 microcontroler has a memory bank switching system |
| 65 | with a 16Kb window in the 64Kb address space. The extended memory |
| 66 | is mapped in the 16Kb window (at 0x8000). The page register controls |
| 67 | which 16Kb bank is mapped. The call/rtc instructions take care of |
| 68 | bank switching in function calls/returns. |
| 69 | |
| 70 | For GNU Binutils to work, we consider there is a physical memory |
| 71 | at 0..0x0ffff and a kind of virtual memory above that. Symbols |
| 72 | in virtual memory have their addresses treated in a special way |
| 73 | when disassembling and when linking. |
| 74 | |
| 75 | For the linker to work properly, we must always relocate the virtual |
| 76 | memory as if it is mapped at 0x8000. When a 16-bit relocation is |
| 77 | made in the virtual memory, we check that it does not cross the |
| 78 | memory bank where it is used. This would involve a page change |
| 79 | which would be wrong. The 24-bit relocation is for that and it |
| 80 | treats the address as a physical address + page number. |
| 81 | |
| 82 | |
| 83 | Banked |
| 84 | Address Space |
| 85 | | | Page n |
| 86 | +---------------+ 0x1010000 |
| 87 | | | |
| 88 | | jsr _foo | |
| 89 | | .. | Page 3 |
| 90 | | _foo: | |
| 91 | +---------------+ 0x100C000 |
| 92 | | | |
| 93 | | call _bar | |
| 94 | | .. | Page 2 |
| 95 | | _bar: | |
| 96 | +---------------+ 0x1008000 |
| 97 | /------>| | |
| 98 | | | call _foo | Page 1 |
| 99 | | | | |
| 100 | | +---------------+ 0x1004000 |
| 101 | Physical | | | |
| 102 | Address Space | | | Page 0 |
| 103 | | | | |
| 104 | +-----------+ 0x00FFFF | +---------------+ 0x1000000 |
| 105 | | | | |
| 106 | | call _foo | | |
| 107 | | | | |
| 108 | +-----------+ 0x00BFFF -+---/ |
| 109 | | | | |
| 110 | | | | |
| 111 | | | 16K | |
| 112 | | | | |
| 113 | +-----------+ 0x008000 -+ |
| 114 | | | |
| 115 | | | |
| 116 | = = |
| 117 | | | |
| 118 | | | |
| 119 | +-----------+ 0000 |
| 120 | |
| 121 | |
| 122 | The 'call _foo' must be relocated with page 3 and 16-bit address |
| 123 | mapped at 0x8000. |
| 124 | |
| 125 | The 3-bit and 16-bit PC rel relocation is only used by 68HC12. */ |
| 126 | static reloc_howto_type elf_m68hc11_howto_table[] = { |
| 127 | /* This reloc does nothing. */ |
| 128 | HOWTO (R_M68HC11_NONE, /* type */ |
| 129 | 0, /* rightshift */ |
| 130 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 131 | 32, /* bitsize */ |
| 132 | false, /* pc_relative */ |
| 133 | 0, /* bitpos */ |
| 134 | complain_overflow_dont,/* complain_on_overflow */ |
| 135 | bfd_elf_generic_reloc, /* special_function */ |
| 136 | "R_M68HC12_NONE", /* name */ |
| 137 | false, /* partial_inplace */ |
| 138 | 0, /* src_mask */ |
| 139 | 0, /* dst_mask */ |
| 140 | false), /* pcrel_offset */ |
| 141 | |
| 142 | /* A 8 bit absolute relocation */ |
| 143 | HOWTO (R_M68HC11_8, /* type */ |
| 144 | 0, /* rightshift */ |
| 145 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 146 | 8, /* bitsize */ |
| 147 | false, /* pc_relative */ |
| 148 | 0, /* bitpos */ |
| 149 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 150 | bfd_elf_generic_reloc, /* special_function */ |
| 151 | "R_M68HC12_8", /* name */ |
| 152 | false, /* partial_inplace */ |
| 153 | 0x00ff, /* src_mask */ |
| 154 | 0x00ff, /* dst_mask */ |
| 155 | false), /* pcrel_offset */ |
| 156 | |
| 157 | /* A 8 bit absolute relocation (upper address) */ |
| 158 | HOWTO (R_M68HC11_HI8, /* type */ |
| 159 | 8, /* rightshift */ |
| 160 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 161 | 8, /* bitsize */ |
| 162 | false, /* pc_relative */ |
| 163 | 0, /* bitpos */ |
| 164 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 165 | bfd_elf_generic_reloc, /* special_function */ |
| 166 | "R_M68HC12_HI8", /* name */ |
| 167 | false, /* partial_inplace */ |
| 168 | 0x00ff, /* src_mask */ |
| 169 | 0x00ff, /* dst_mask */ |
| 170 | false), /* pcrel_offset */ |
| 171 | |
| 172 | /* A 8 bit absolute relocation (upper address) */ |
| 173 | HOWTO (R_M68HC11_LO8, /* type */ |
| 174 | 0, /* rightshift */ |
| 175 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 176 | 8, /* bitsize */ |
| 177 | false, /* pc_relative */ |
| 178 | 0, /* bitpos */ |
| 179 | complain_overflow_dont, /* complain_on_overflow */ |
| 180 | bfd_elf_generic_reloc, /* special_function */ |
| 181 | "R_M68HC12_LO8", /* name */ |
| 182 | false, /* partial_inplace */ |
| 183 | 0x00ff, /* src_mask */ |
| 184 | 0x00ff, /* dst_mask */ |
| 185 | false), /* pcrel_offset */ |
| 186 | |
| 187 | /* A 8 bit PC-rel relocation */ |
| 188 | HOWTO (R_M68HC11_PCREL_8, /* type */ |
| 189 | 0, /* rightshift */ |
| 190 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 191 | 8, /* bitsize */ |
| 192 | true, /* pc_relative */ |
| 193 | 0, /* bitpos */ |
| 194 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 195 | bfd_elf_generic_reloc, /* special_function */ |
| 196 | "R_M68HC12_PCREL_8", /* name */ |
| 197 | false, /* partial_inplace */ |
| 198 | 0x00ff, /* src_mask */ |
| 199 | 0x00ff, /* dst_mask */ |
| 200 | false), /* pcrel_offset */ |
| 201 | |
| 202 | /* A 16 bit absolute relocation */ |
| 203 | HOWTO (R_M68HC11_16, /* type */ |
| 204 | 0, /* rightshift */ |
| 205 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 206 | 16, /* bitsize */ |
| 207 | false, /* pc_relative */ |
| 208 | 0, /* bitpos */ |
| 209 | complain_overflow_dont /*bitfield */ , /* complain_on_overflow */ |
| 210 | m68hc12_elf_special_reloc, /* special_function */ |
| 211 | "R_M68HC12_16", /* name */ |
| 212 | false, /* partial_inplace */ |
| 213 | 0xffff, /* src_mask */ |
| 214 | 0xffff, /* dst_mask */ |
| 215 | false), /* pcrel_offset */ |
| 216 | |
| 217 | /* A 32 bit absolute relocation. This one is never used for the |
| 218 | code relocation. It's used by gas for -gstabs generation. */ |
| 219 | HOWTO (R_M68HC11_32, /* type */ |
| 220 | 0, /* rightshift */ |
| 221 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 222 | 32, /* bitsize */ |
| 223 | false, /* pc_relative */ |
| 224 | 0, /* bitpos */ |
| 225 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 226 | bfd_elf_generic_reloc, /* special_function */ |
| 227 | "R_M68HC12_32", /* name */ |
| 228 | false, /* partial_inplace */ |
| 229 | 0xffffffff, /* src_mask */ |
| 230 | 0xffffffff, /* dst_mask */ |
| 231 | false), /* pcrel_offset */ |
| 232 | |
| 233 | /* A 3 bit absolute relocation */ |
| 234 | HOWTO (R_M68HC11_3B, /* type */ |
| 235 | 0, /* rightshift */ |
| 236 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 237 | 3, /* bitsize */ |
| 238 | false, /* pc_relative */ |
| 239 | 0, /* bitpos */ |
| 240 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 241 | bfd_elf_generic_reloc, /* special_function */ |
| 242 | "R_M68HC12_4B", /* name */ |
| 243 | false, /* partial_inplace */ |
| 244 | 0x003, /* src_mask */ |
| 245 | 0x003, /* dst_mask */ |
| 246 | false), /* pcrel_offset */ |
| 247 | |
| 248 | /* A 16 bit PC-rel relocation */ |
| 249 | HOWTO (R_M68HC11_PCREL_16, /* type */ |
| 250 | 0, /* rightshift */ |
| 251 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 252 | 16, /* bitsize */ |
| 253 | true, /* pc_relative */ |
| 254 | 0, /* bitpos */ |
| 255 | complain_overflow_dont, /* complain_on_overflow */ |
| 256 | bfd_elf_generic_reloc, /* special_function */ |
| 257 | "R_M68HC12_PCREL_16", /* name */ |
| 258 | false, /* partial_inplace */ |
| 259 | 0xffff, /* src_mask */ |
| 260 | 0xffff, /* dst_mask */ |
| 261 | false), /* pcrel_offset */ |
| 262 | |
| 263 | /* GNU extension to record C++ vtable hierarchy */ |
| 264 | HOWTO (R_M68HC11_GNU_VTINHERIT, /* type */ |
| 265 | 0, /* rightshift */ |
| 266 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 267 | 0, /* bitsize */ |
| 268 | false, /* pc_relative */ |
| 269 | 0, /* bitpos */ |
| 270 | complain_overflow_dont, /* complain_on_overflow */ |
| 271 | NULL, /* special_function */ |
| 272 | "R_M68HC11_GNU_VTINHERIT", /* name */ |
| 273 | false, /* partial_inplace */ |
| 274 | 0, /* src_mask */ |
| 275 | 0, /* dst_mask */ |
| 276 | false), /* pcrel_offset */ |
| 277 | |
| 278 | /* GNU extension to record C++ vtable member usage */ |
| 279 | HOWTO (R_M68HC11_GNU_VTENTRY, /* type */ |
| 280 | 0, /* rightshift */ |
| 281 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 282 | 0, /* bitsize */ |
| 283 | false, /* pc_relative */ |
| 284 | 0, /* bitpos */ |
| 285 | complain_overflow_dont, /* complain_on_overflow */ |
| 286 | _bfd_elf_rel_vtable_reloc_fn, /* special_function */ |
| 287 | "R_M68HC11_GNU_VTENTRY", /* name */ |
| 288 | false, /* partial_inplace */ |
| 289 | 0, /* src_mask */ |
| 290 | 0, /* dst_mask */ |
| 291 | false), /* pcrel_offset */ |
| 292 | |
| 293 | /* A 24 bit relocation */ |
| 294 | HOWTO (R_M68HC11_24, /* type */ |
| 295 | 0, /* rightshift */ |
| 296 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 297 | 24, /* bitsize */ |
| 298 | false, /* pc_relative */ |
| 299 | 0, /* bitpos */ |
| 300 | complain_overflow_dont, /* complain_on_overflow */ |
| 301 | m68hc12_elf_special_reloc, /* special_function */ |
| 302 | "R_M68HC12_24", /* name */ |
| 303 | false, /* partial_inplace */ |
| 304 | 0xffff, /* src_mask */ |
| 305 | 0xffff, /* dst_mask */ |
| 306 | false), /* pcrel_offset */ |
| 307 | |
| 308 | /* A 16-bit low relocation */ |
| 309 | HOWTO (R_M68HC11_LO16, /* type */ |
| 310 | 0, /* rightshift */ |
| 311 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 312 | 16, /* bitsize */ |
| 313 | false, /* pc_relative */ |
| 314 | 0, /* bitpos */ |
| 315 | complain_overflow_dont, /* complain_on_overflow */ |
| 316 | m68hc12_elf_special_reloc,/* special_function */ |
| 317 | "R_M68HC12_LO16", /* name */ |
| 318 | false, /* partial_inplace */ |
| 319 | 0xffff, /* src_mask */ |
| 320 | 0xffff, /* dst_mask */ |
| 321 | false), /* pcrel_offset */ |
| 322 | |
| 323 | /* A page relocation */ |
| 324 | HOWTO (R_M68HC11_PAGE, /* type */ |
| 325 | 0, /* rightshift */ |
| 326 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 327 | 8, /* bitsize */ |
| 328 | false, /* pc_relative */ |
| 329 | 0, /* bitpos */ |
| 330 | complain_overflow_dont, /* complain_on_overflow */ |
| 331 | m68hc12_elf_special_reloc,/* special_function */ |
| 332 | "R_M68HC12_PAGE", /* name */ |
| 333 | false, /* partial_inplace */ |
| 334 | 0x00ff, /* src_mask */ |
| 335 | 0x00ff, /* dst_mask */ |
| 336 | false), /* pcrel_offset */ |
| 337 | |
| 338 | EMPTY_HOWTO (14), |
| 339 | EMPTY_HOWTO (15), |
| 340 | EMPTY_HOWTO (16), |
| 341 | EMPTY_HOWTO (17), |
| 342 | EMPTY_HOWTO (18), |
| 343 | EMPTY_HOWTO (19), |
| 344 | |
| 345 | /* Mark beginning of a jump instruction (any form). */ |
| 346 | HOWTO (R_M68HC11_RL_JUMP, /* type */ |
| 347 | 0, /* rightshift */ |
| 348 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 349 | 0, /* bitsize */ |
| 350 | false, /* pc_relative */ |
| 351 | 0, /* bitpos */ |
| 352 | complain_overflow_dont, /* complain_on_overflow */ |
| 353 | m68hc11_elf_ignore_reloc, /* special_function */ |
| 354 | "R_M68HC12_RL_JUMP", /* name */ |
| 355 | true, /* partial_inplace */ |
| 356 | 0, /* src_mask */ |
| 357 | 0, /* dst_mask */ |
| 358 | true), /* pcrel_offset */ |
| 359 | |
| 360 | /* Mark beginning of Gcc relaxation group instruction. */ |
| 361 | HOWTO (R_M68HC11_RL_GROUP, /* type */ |
| 362 | 0, /* rightshift */ |
| 363 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 364 | 0, /* bitsize */ |
| 365 | false, /* pc_relative */ |
| 366 | 0, /* bitpos */ |
| 367 | complain_overflow_dont, /* complain_on_overflow */ |
| 368 | m68hc11_elf_ignore_reloc, /* special_function */ |
| 369 | "R_M68HC12_RL_GROUP", /* name */ |
| 370 | true, /* partial_inplace */ |
| 371 | 0, /* src_mask */ |
| 372 | 0, /* dst_mask */ |
| 373 | true), /* pcrel_offset */ |
| 374 | }; |
| 375 | |
| 376 | /* Map BFD reloc types to M68HC11 ELF reloc types. */ |
| 377 | |
| 378 | struct m68hc11_reloc_map |
| 379 | { |
| 380 | bfd_reloc_code_real_type bfd_reloc_val; |
| 381 | unsigned char elf_reloc_val; |
| 382 | }; |
| 383 | |
| 384 | static const struct m68hc11_reloc_map m68hc11_reloc_map[] = { |
| 385 | {BFD_RELOC_NONE, R_M68HC11_NONE,}, |
| 386 | {BFD_RELOC_8, R_M68HC11_8}, |
| 387 | {BFD_RELOC_M68HC11_HI8, R_M68HC11_HI8}, |
| 388 | {BFD_RELOC_M68HC11_LO8, R_M68HC11_LO8}, |
| 389 | {BFD_RELOC_8_PCREL, R_M68HC11_PCREL_8}, |
| 390 | {BFD_RELOC_16_PCREL, R_M68HC11_PCREL_16}, |
| 391 | {BFD_RELOC_16, R_M68HC11_16}, |
| 392 | {BFD_RELOC_32, R_M68HC11_32}, |
| 393 | {BFD_RELOC_M68HC11_3B, R_M68HC11_3B}, |
| 394 | |
| 395 | {BFD_RELOC_VTABLE_INHERIT, R_M68HC11_GNU_VTINHERIT}, |
| 396 | {BFD_RELOC_VTABLE_ENTRY, R_M68HC11_GNU_VTENTRY}, |
| 397 | |
| 398 | {BFD_RELOC_M68HC11_LO16, R_M68HC11_LO16}, |
| 399 | {BFD_RELOC_M68HC11_PAGE, R_M68HC11_PAGE}, |
| 400 | {BFD_RELOC_M68HC11_24, R_M68HC11_24}, |
| 401 | |
| 402 | {BFD_RELOC_M68HC11_RL_JUMP, R_M68HC11_RL_JUMP}, |
| 403 | {BFD_RELOC_M68HC11_RL_GROUP, R_M68HC11_RL_GROUP}, |
| 404 | }; |
| 405 | |
| 406 | static reloc_howto_type * |
| 407 | bfd_elf32_bfd_reloc_type_lookup (abfd, code) |
| 408 | bfd *abfd ATTRIBUTE_UNUSED; |
| 409 | bfd_reloc_code_real_type code; |
| 410 | { |
| 411 | unsigned int i; |
| 412 | |
| 413 | for (i = 0; |
| 414 | i < sizeof (m68hc11_reloc_map) / sizeof (struct m68hc11_reloc_map); |
| 415 | i++) |
| 416 | { |
| 417 | if (m68hc11_reloc_map[i].bfd_reloc_val == code) |
| 418 | return &elf_m68hc11_howto_table[m68hc11_reloc_map[i].elf_reloc_val]; |
| 419 | } |
| 420 | |
| 421 | return NULL; |
| 422 | } |
| 423 | |
| 424 | /* This function is used for relocs which are only used for relaxing, |
| 425 | which the linker should otherwise ignore. */ |
| 426 | |
| 427 | static bfd_reloc_status_type |
| 428 | m68hc11_elf_ignore_reloc (abfd, reloc_entry, symbol, data, input_section, |
| 429 | output_bfd, error_message) |
| 430 | bfd *abfd ATTRIBUTE_UNUSED; |
| 431 | arelent *reloc_entry; |
| 432 | asymbol *symbol ATTRIBUTE_UNUSED; |
| 433 | PTR data ATTRIBUTE_UNUSED; |
| 434 | asection *input_section; |
| 435 | bfd *output_bfd; |
| 436 | char **error_message ATTRIBUTE_UNUSED; |
| 437 | { |
| 438 | if (output_bfd != NULL) |
| 439 | reloc_entry->address += input_section->output_offset; |
| 440 | return bfd_reloc_ok; |
| 441 | } |
| 442 | |
| 443 | static int |
| 444 | m68hc12_addr_is_banked (addr) |
| 445 | bfd_vma addr; |
| 446 | { |
| 447 | return (addr >= M68HC12_BANK_VIRT) ? 1 : 0; |
| 448 | } |
| 449 | |
| 450 | /* Return the physical address seen by the processor, taking |
| 451 | into account banked memory. */ |
| 452 | static bfd_vma |
| 453 | m68hc12_phys_addr (addr) |
| 454 | bfd_vma addr; |
| 455 | { |
| 456 | if (addr < M68HC12_BANK_VIRT) |
| 457 | return addr; |
| 458 | |
| 459 | /* Map the address to the memory bank. */ |
| 460 | addr -= M68HC12_BANK_VIRT; |
| 461 | addr &= M68HC12_BANK_MASK; |
| 462 | addr += M68HC12_BANK_BASE; |
| 463 | return addr; |
| 464 | } |
| 465 | |
| 466 | /* Return the page number corresponding to an address in banked memory. */ |
| 467 | static bfd_vma |
| 468 | m68hc12_phys_page (addr) |
| 469 | bfd_vma addr; |
| 470 | { |
| 471 | if (addr < M68HC12_BANK_VIRT) |
| 472 | return 0; |
| 473 | |
| 474 | /* Map the address to the memory bank. */ |
| 475 | addr -= M68HC12_BANK_VIRT; |
| 476 | addr >>= M68HC12_BANK_SHIFT; |
| 477 | addr &= M68HC12_BANK_PAGE_MASK; |
| 478 | return addr; |
| 479 | } |
| 480 | |
| 481 | static bfd_reloc_status_type |
| 482 | m68hc12_elf_special_reloc (abfd, reloc_entry, symbol, data, input_section, |
| 483 | output_bfd, error_message) |
| 484 | bfd *abfd; |
| 485 | arelent *reloc_entry; |
| 486 | asymbol *symbol; |
| 487 | PTR data; |
| 488 | asection *input_section; |
| 489 | bfd *output_bfd; |
| 490 | char **error_message ATTRIBUTE_UNUSED; |
| 491 | { |
| 492 | reloc_howto_type *howto; |
| 493 | bfd_vma relocation; |
| 494 | bfd_vma phys_addr; |
| 495 | bfd_vma phys_page; |
| 496 | bfd_vma insn_page; |
| 497 | bfd_vma insn_addr; |
| 498 | |
| 499 | if (output_bfd != (bfd *) NULL |
| 500 | && (symbol->flags & BSF_SECTION_SYM) == 0 |
| 501 | && (! reloc_entry->howto->partial_inplace |
| 502 | || reloc_entry->addend == 0)) |
| 503 | { |
| 504 | reloc_entry->address += input_section->output_offset; |
| 505 | return bfd_reloc_ok; |
| 506 | } |
| 507 | |
| 508 | if (output_bfd != NULL) |
| 509 | return bfd_reloc_continue; |
| 510 | |
| 511 | if (reloc_entry->address > input_section->_cooked_size) |
| 512 | return bfd_reloc_outofrange; |
| 513 | |
| 514 | /* Compute relocation. */ |
| 515 | relocation = (symbol->value |
| 516 | + symbol->section->output_section->vma |
| 517 | + symbol->section->output_offset); |
| 518 | relocation += reloc_entry->addend; |
| 519 | relocation += bfd_get_16 (abfd, (bfd_byte*) data + reloc_entry->address); |
| 520 | |
| 521 | /* Do the memory bank mapping. */ |
| 522 | phys_addr = m68hc12_phys_addr (relocation); |
| 523 | phys_page = m68hc12_phys_page (relocation); |
| 524 | |
| 525 | howto = reloc_entry->howto; |
| 526 | if (howto->complain_on_overflow != complain_overflow_dont |
| 527 | && (phys_addr & (((bfd_vma) -1) << 16))) |
| 528 | return bfd_reloc_overflow; |
| 529 | |
| 530 | switch (howto->type) |
| 531 | { |
| 532 | case R_M68HC11_16: |
| 533 | /* Get virtual address of instruction having the relocation. */ |
| 534 | insn_addr = input_section->output_section->vma |
| 535 | + input_section->output_offset |
| 536 | + reloc_entry->address; |
| 537 | |
| 538 | insn_page = m68hc12_phys_page (insn_addr); |
| 539 | |
| 540 | if (m68hc12_addr_is_banked (relocation) |
| 541 | && m68hc12_addr_is_banked (insn_addr) |
| 542 | && phys_page != insn_page) |
| 543 | { |
| 544 | *error_message = _("address is not in the same bank"); |
| 545 | return bfd_reloc_dangerous; |
| 546 | } |
| 547 | if (m68hc12_addr_is_banked (relocation) |
| 548 | && !m68hc12_addr_is_banked (insn_addr)) |
| 549 | { |
| 550 | *error_message = _("reference to a banked address in " |
| 551 | "the normal address space"); |
| 552 | return bfd_reloc_dangerous; |
| 553 | } |
| 554 | |
| 555 | case R_M68HC11_LO16: |
| 556 | bfd_put_16 (abfd, phys_addr, (bfd_byte*) data + reloc_entry->address); |
| 557 | break; |
| 558 | |
| 559 | case R_M68HC11_24: |
| 560 | bfd_put_16 (abfd, phys_addr, (bfd_byte*) data + reloc_entry->address); |
| 561 | bfd_put_8 (abfd, phys_page, (bfd_byte*) data + reloc_entry->address + 2); |
| 562 | break; |
| 563 | |
| 564 | case R_M68HC11_PAGE: |
| 565 | bfd_put_8 (abfd, phys_page, (bfd_byte*) data + reloc_entry->address); |
| 566 | break; |
| 567 | |
| 568 | default: |
| 569 | abort (); |
| 570 | break; |
| 571 | } |
| 572 | |
| 573 | return bfd_reloc_ok; |
| 574 | } |
| 575 | |
| 576 | /* Set the howto pointer for an M68HC11 ELF reloc. */ |
| 577 | |
| 578 | static void |
| 579 | m68hc11_info_to_howto_rel (abfd, cache_ptr, dst) |
| 580 | bfd *abfd ATTRIBUTE_UNUSED; |
| 581 | arelent *cache_ptr; |
| 582 | Elf32_Internal_Rel *dst; |
| 583 | { |
| 584 | unsigned int r_type; |
| 585 | |
| 586 | r_type = ELF32_R_TYPE (dst->r_info); |
| 587 | BFD_ASSERT (r_type < (unsigned int) R_M68HC11_max); |
| 588 | cache_ptr->howto = &elf_m68hc11_howto_table[r_type]; |
| 589 | } |
| 590 | |
| 591 | static asection * |
| 592 | elf32_m68hc11_gc_mark_hook (sec, info, rel, h, sym) |
| 593 | asection *sec; |
| 594 | struct bfd_link_info *info ATTRIBUTE_UNUSED; |
| 595 | Elf_Internal_Rela *rel; |
| 596 | struct elf_link_hash_entry *h; |
| 597 | Elf_Internal_Sym *sym; |
| 598 | { |
| 599 | if (h != NULL) |
| 600 | { |
| 601 | switch (ELF32_R_TYPE (rel->r_info)) |
| 602 | { |
| 603 | default: |
| 604 | switch (h->root.type) |
| 605 | { |
| 606 | case bfd_link_hash_defined: |
| 607 | case bfd_link_hash_defweak: |
| 608 | return h->root.u.def.section; |
| 609 | |
| 610 | case bfd_link_hash_common: |
| 611 | return h->root.u.c.p->section; |
| 612 | |
| 613 | default: |
| 614 | break; |
| 615 | } |
| 616 | } |
| 617 | } |
| 618 | else |
| 619 | return bfd_section_from_elf_index (sec->owner, sym->st_shndx); |
| 620 | |
| 621 | return NULL; |
| 622 | } |
| 623 | |
| 624 | static boolean |
| 625 | elf32_m68hc11_gc_sweep_hook (abfd, info, sec, relocs) |
| 626 | bfd *abfd ATTRIBUTE_UNUSED; |
| 627 | struct bfd_link_info *info ATTRIBUTE_UNUSED; |
| 628 | asection *sec ATTRIBUTE_UNUSED; |
| 629 | const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED; |
| 630 | { |
| 631 | /* We don't use got and plt entries for 68hc11/68hc12. */ |
| 632 | return true; |
| 633 | } |
| 634 | |
| 635 | \f |
| 636 | /* Set and control ELF flags in ELF header. */ |
| 637 | |
| 638 | boolean |
| 639 | _bfd_m68hc12_elf_set_private_flags (abfd, flags) |
| 640 | bfd *abfd; |
| 641 | flagword flags; |
| 642 | { |
| 643 | BFD_ASSERT (!elf_flags_init (abfd) |
| 644 | || elf_elfheader (abfd)->e_flags == flags); |
| 645 | |
| 646 | elf_elfheader (abfd)->e_flags = flags; |
| 647 | elf_flags_init (abfd) = true; |
| 648 | return true; |
| 649 | } |
| 650 | |
| 651 | /* Merge backend specific data from an object file to the output |
| 652 | object file when linking. */ |
| 653 | |
| 654 | boolean |
| 655 | _bfd_m68hc12_elf_merge_private_bfd_data (ibfd, obfd) |
| 656 | bfd *ibfd; |
| 657 | bfd *obfd; |
| 658 | { |
| 659 | flagword old_flags; |
| 660 | flagword new_flags; |
| 661 | boolean ok = true; |
| 662 | |
| 663 | /* Check if we have the same endianess */ |
| 664 | if (_bfd_generic_verify_endian_match (ibfd, obfd) == false) |
| 665 | return false; |
| 666 | |
| 667 | if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour |
| 668 | || bfd_get_flavour (obfd) != bfd_target_elf_flavour) |
| 669 | return true; |
| 670 | |
| 671 | new_flags = elf_elfheader (ibfd)->e_flags; |
| 672 | elf_elfheader (obfd)->e_flags |= new_flags & EF_M68HC11_ABI; |
| 673 | old_flags = elf_elfheader (obfd)->e_flags; |
| 674 | |
| 675 | if (! elf_flags_init (obfd)) |
| 676 | { |
| 677 | elf_flags_init (obfd) = true; |
| 678 | elf_elfheader (obfd)->e_flags = new_flags; |
| 679 | elf_elfheader (obfd)->e_ident[EI_CLASS] |
| 680 | = elf_elfheader (ibfd)->e_ident[EI_CLASS]; |
| 681 | |
| 682 | if (bfd_get_arch (obfd) == bfd_get_arch (ibfd) |
| 683 | && bfd_get_arch_info (obfd)->the_default) |
| 684 | { |
| 685 | if (! bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), |
| 686 | bfd_get_mach (ibfd))) |
| 687 | return false; |
| 688 | } |
| 689 | |
| 690 | return true; |
| 691 | } |
| 692 | |
| 693 | /* Check ABI compatibility. */ |
| 694 | if ((new_flags & E_M68HC11_I32) != (old_flags & E_M68HC11_I32)) |
| 695 | { |
| 696 | (*_bfd_error_handler) |
| 697 | (_("%s: linking files compiled for 16-bit integers (-mshort) " |
| 698 | "and others for 32-bit integers"), |
| 699 | bfd_archive_filename (ibfd)); |
| 700 | ok = false; |
| 701 | } |
| 702 | if ((new_flags & E_M68HC11_F64) != (old_flags & E_M68HC11_F64)) |
| 703 | { |
| 704 | (*_bfd_error_handler) |
| 705 | (_("%s: linking files compiled for 32-bit double (-fshort-double) " |
| 706 | "and others for 64-bit double"), |
| 707 | bfd_archive_filename (ibfd)); |
| 708 | ok = false; |
| 709 | } |
| 710 | new_flags &= ~EF_M68HC11_ABI; |
| 711 | old_flags &= ~EF_M68HC11_ABI; |
| 712 | |
| 713 | /* Warn about any other mismatches */ |
| 714 | if (new_flags != old_flags) |
| 715 | { |
| 716 | (*_bfd_error_handler) |
| 717 | (_("%s: uses different e_flags (0x%lx) fields than previous modules (0x%lx)"), |
| 718 | bfd_archive_filename (ibfd), (unsigned long) new_flags, |
| 719 | (unsigned long) old_flags); |
| 720 | ok = false; |
| 721 | } |
| 722 | |
| 723 | if (! ok) |
| 724 | { |
| 725 | bfd_set_error (bfd_error_bad_value); |
| 726 | return false; |
| 727 | } |
| 728 | |
| 729 | return true; |
| 730 | } |
| 731 | |
| 732 | boolean |
| 733 | _bfd_m68hc12_elf_print_private_bfd_data (abfd, ptr) |
| 734 | bfd *abfd; |
| 735 | PTR ptr; |
| 736 | { |
| 737 | FILE *file = (FILE *) ptr; |
| 738 | |
| 739 | BFD_ASSERT (abfd != NULL && ptr != NULL); |
| 740 | |
| 741 | /* Print normal ELF private data. */ |
| 742 | _bfd_elf_print_private_bfd_data (abfd, ptr); |
| 743 | |
| 744 | /* xgettext:c-format */ |
| 745 | fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); |
| 746 | |
| 747 | if (elf_elfheader (abfd)->e_flags & E_M68HC11_I32) |
| 748 | fprintf (file, _("[abi=32-bit int,")); |
| 749 | else |
| 750 | fprintf (file, _("[abi=16-bit int,")); |
| 751 | |
| 752 | if (elf_elfheader (abfd)->e_flags & E_M68HC11_F64) |
| 753 | fprintf (file, _(" 64-bit double]")); |
| 754 | else |
| 755 | fprintf (file, _(" 32-bit double]")); |
| 756 | |
| 757 | fputc ('\n', file); |
| 758 | |
| 759 | return true; |
| 760 | } |
| 761 | |
| 762 | /* Below is the only difference between elf32-m68hc12.c and elf32-m68hc11.c. |
| 763 | The Motorola spec says to use a different Elf machine code. */ |
| 764 | #define ELF_ARCH bfd_arch_m68hc12 |
| 765 | #define ELF_MACHINE_CODE EM_68HC12 |
| 766 | #define ELF_MAXPAGESIZE 0x1000 |
| 767 | |
| 768 | #define TARGET_BIG_SYM bfd_elf32_m68hc12_vec |
| 769 | #define TARGET_BIG_NAME "elf32-m68hc12" |
| 770 | |
| 771 | #define elf_info_to_howto 0 |
| 772 | #define elf_info_to_howto_rel m68hc11_info_to_howto_rel |
| 773 | #define elf_backend_gc_mark_hook elf32_m68hc11_gc_mark_hook |
| 774 | #define elf_backend_gc_sweep_hook elf32_m68hc11_gc_sweep_hook |
| 775 | #define elf_backend_object_p 0 |
| 776 | #define elf_backend_final_write_processing 0 |
| 777 | /* Disabled as this backend uses the generic linker. */ |
| 778 | #define elf_backend_can_gc_sections 0 |
| 779 | |
| 780 | #define bfd_elf32_bfd_merge_private_bfd_data \ |
| 781 | _bfd_m68hc12_elf_merge_private_bfd_data |
| 782 | #define bfd_elf32_bfd_set_private_flags _bfd_m68hc12_elf_set_private_flags |
| 783 | #define bfd_elf32_bfd_print_private_bfd_data \ |
| 784 | _bfd_m68hc12_elf_print_private_bfd_data |
| 785 | |
| 786 | #include "elf32-target.h" |