| 1 | /* Motorola 68HC12-specific support for 32-bit ELF |
| 2 | Copyright 1999, 2000, 2002, 2003, 2004, 2005, 2006, 2007 |
| 3 | Free Software Foundation, Inc. |
| 4 | Contributed by Stephane Carrez (stcarrez@nerim.fr) |
| 5 | (Heavily copied from the D10V port by Martin Hunt (hunt@cygnus.com)) |
| 6 | |
| 7 | This file is part of BFD, the Binary File Descriptor library. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 3 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program; if not, write to the Free Software |
| 21 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 22 | MA 02110-1301, USA. */ |
| 23 | |
| 24 | #include "sysdep.h" |
| 25 | #include "bfd.h" |
| 26 | #include "bfdlink.h" |
| 27 | #include "libbfd.h" |
| 28 | #include "elf-bfd.h" |
| 29 | #include "elf32-m68hc1x.h" |
| 30 | #include "elf/m68hc11.h" |
| 31 | #include "opcode/m68hc11.h" |
| 32 | |
| 33 | /* Relocation functions. */ |
| 34 | static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup |
| 35 | (bfd *, bfd_reloc_code_real_type); |
| 36 | static void m68hc11_info_to_howto_rel |
| 37 | (bfd *, arelent *, Elf_Internal_Rela *); |
| 38 | |
| 39 | /* Trampoline generation. */ |
| 40 | static bfd_boolean m68hc12_elf_size_one_stub |
| 41 | (struct bfd_hash_entry *gen_entry, void *in_arg); |
| 42 | static bfd_boolean m68hc12_elf_build_one_stub |
| 43 | (struct bfd_hash_entry *gen_entry, void *in_arg); |
| 44 | static struct bfd_link_hash_table* m68hc12_elf_bfd_link_hash_table_create |
| 45 | (bfd*); |
| 46 | |
| 47 | static bfd_boolean m68hc12_elf_set_mach_from_flags PARAMS ((bfd *)); |
| 48 | |
| 49 | /* Use REL instead of RELA to save space */ |
| 50 | #define USE_REL 1 |
| 51 | |
| 52 | /* The 68HC12 microcontroler has a memory bank switching system |
| 53 | with a 16Kb window in the 64Kb address space. The extended memory |
| 54 | is mapped in the 16Kb window (at 0x8000). The page register controls |
| 55 | which 16Kb bank is mapped. The call/rtc instructions take care of |
| 56 | bank switching in function calls/returns. |
| 57 | |
| 58 | For GNU Binutils to work, we consider there is a physical memory |
| 59 | at 0..0x0ffff and a kind of virtual memory above that. Symbols |
| 60 | in virtual memory have their addresses treated in a special way |
| 61 | when disassembling and when linking. |
| 62 | |
| 63 | For the linker to work properly, we must always relocate the virtual |
| 64 | memory as if it is mapped at 0x8000. When a 16-bit relocation is |
| 65 | made in the virtual memory, we check that it does not cross the |
| 66 | memory bank where it is used. This would involve a page change |
| 67 | which would be wrong. The 24-bit relocation is for that and it |
| 68 | treats the address as a physical address + page number. |
| 69 | |
| 70 | |
| 71 | Banked |
| 72 | Address Space |
| 73 | | | Page n |
| 74 | +---------------+ 0x1010000 |
| 75 | | | |
| 76 | | jsr _foo | |
| 77 | | .. | Page 3 |
| 78 | | _foo: | |
| 79 | +---------------+ 0x100C000 |
| 80 | | | |
| 81 | | call _bar | |
| 82 | | .. | Page 2 |
| 83 | | _bar: | |
| 84 | +---------------+ 0x1008000 |
| 85 | /------>| | |
| 86 | | | call _foo | Page 1 |
| 87 | | | | |
| 88 | | +---------------+ 0x1004000 |
| 89 | Physical | | | |
| 90 | Address Space | | | Page 0 |
| 91 | | | | |
| 92 | +-----------+ 0x00FFFF | +---------------+ 0x1000000 |
| 93 | | | | |
| 94 | | call _foo | | |
| 95 | | | | |
| 96 | +-----------+ 0x00BFFF -+---/ |
| 97 | | | | |
| 98 | | | | |
| 99 | | | 16K | |
| 100 | | | | |
| 101 | +-----------+ 0x008000 -+ |
| 102 | | | |
| 103 | | | |
| 104 | = = |
| 105 | | | |
| 106 | | | |
| 107 | +-----------+ 0000 |
| 108 | |
| 109 | |
| 110 | The 'call _foo' must be relocated with page 3 and 16-bit address |
| 111 | mapped at 0x8000. |
| 112 | |
| 113 | The 3-bit and 16-bit PC rel relocation is only used by 68HC12. */ |
| 114 | static reloc_howto_type elf_m68hc11_howto_table[] = { |
| 115 | /* This reloc does nothing. */ |
| 116 | HOWTO (R_M68HC11_NONE, /* type */ |
| 117 | 0, /* rightshift */ |
| 118 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 119 | 32, /* bitsize */ |
| 120 | FALSE, /* pc_relative */ |
| 121 | 0, /* bitpos */ |
| 122 | complain_overflow_dont,/* complain_on_overflow */ |
| 123 | bfd_elf_generic_reloc, /* special_function */ |
| 124 | "R_M68HC12_NONE", /* name */ |
| 125 | FALSE, /* partial_inplace */ |
| 126 | 0, /* src_mask */ |
| 127 | 0, /* dst_mask */ |
| 128 | FALSE), /* pcrel_offset */ |
| 129 | |
| 130 | /* A 8 bit absolute relocation */ |
| 131 | HOWTO (R_M68HC11_8, /* type */ |
| 132 | 0, /* rightshift */ |
| 133 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 134 | 8, /* bitsize */ |
| 135 | FALSE, /* pc_relative */ |
| 136 | 0, /* bitpos */ |
| 137 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 138 | bfd_elf_generic_reloc, /* special_function */ |
| 139 | "R_M68HC12_8", /* name */ |
| 140 | FALSE, /* partial_inplace */ |
| 141 | 0x00ff, /* src_mask */ |
| 142 | 0x00ff, /* dst_mask */ |
| 143 | FALSE), /* pcrel_offset */ |
| 144 | |
| 145 | /* A 8 bit absolute relocation (upper address) */ |
| 146 | HOWTO (R_M68HC11_HI8, /* type */ |
| 147 | 8, /* rightshift */ |
| 148 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 149 | 8, /* bitsize */ |
| 150 | FALSE, /* pc_relative */ |
| 151 | 0, /* bitpos */ |
| 152 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 153 | bfd_elf_generic_reloc, /* special_function */ |
| 154 | "R_M68HC12_HI8", /* name */ |
| 155 | FALSE, /* partial_inplace */ |
| 156 | 0x00ff, /* src_mask */ |
| 157 | 0x00ff, /* dst_mask */ |
| 158 | FALSE), /* pcrel_offset */ |
| 159 | |
| 160 | /* A 8 bit absolute relocation (upper address) */ |
| 161 | HOWTO (R_M68HC11_LO8, /* type */ |
| 162 | 0, /* rightshift */ |
| 163 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 164 | 8, /* bitsize */ |
| 165 | FALSE, /* pc_relative */ |
| 166 | 0, /* bitpos */ |
| 167 | complain_overflow_dont, /* complain_on_overflow */ |
| 168 | bfd_elf_generic_reloc, /* special_function */ |
| 169 | "R_M68HC12_LO8", /* name */ |
| 170 | FALSE, /* partial_inplace */ |
| 171 | 0x00ff, /* src_mask */ |
| 172 | 0x00ff, /* dst_mask */ |
| 173 | FALSE), /* pcrel_offset */ |
| 174 | |
| 175 | /* A 8 bit PC-rel relocation */ |
| 176 | HOWTO (R_M68HC11_PCREL_8, /* type */ |
| 177 | 0, /* rightshift */ |
| 178 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 179 | 8, /* bitsize */ |
| 180 | TRUE, /* pc_relative */ |
| 181 | 0, /* bitpos */ |
| 182 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 183 | bfd_elf_generic_reloc, /* special_function */ |
| 184 | "R_M68HC12_PCREL_8", /* name */ |
| 185 | FALSE, /* partial_inplace */ |
| 186 | 0x00ff, /* src_mask */ |
| 187 | 0x00ff, /* dst_mask */ |
| 188 | TRUE), /* pcrel_offset */ |
| 189 | |
| 190 | /* A 16 bit absolute relocation */ |
| 191 | HOWTO (R_M68HC11_16, /* type */ |
| 192 | 0, /* rightshift */ |
| 193 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 194 | 16, /* bitsize */ |
| 195 | FALSE, /* pc_relative */ |
| 196 | 0, /* bitpos */ |
| 197 | complain_overflow_dont /*bitfield */ , /* complain_on_overflow */ |
| 198 | bfd_elf_generic_reloc, /* special_function */ |
| 199 | "R_M68HC12_16", /* name */ |
| 200 | FALSE, /* partial_inplace */ |
| 201 | 0xffff, /* src_mask */ |
| 202 | 0xffff, /* dst_mask */ |
| 203 | FALSE), /* pcrel_offset */ |
| 204 | |
| 205 | /* A 32 bit absolute relocation. This one is never used for the |
| 206 | code relocation. It's used by gas for -gstabs generation. */ |
| 207 | HOWTO (R_M68HC11_32, /* type */ |
| 208 | 0, /* rightshift */ |
| 209 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 210 | 32, /* bitsize */ |
| 211 | FALSE, /* pc_relative */ |
| 212 | 0, /* bitpos */ |
| 213 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 214 | bfd_elf_generic_reloc, /* special_function */ |
| 215 | "R_M68HC12_32", /* name */ |
| 216 | FALSE, /* partial_inplace */ |
| 217 | 0xffffffff, /* src_mask */ |
| 218 | 0xffffffff, /* dst_mask */ |
| 219 | FALSE), /* pcrel_offset */ |
| 220 | |
| 221 | /* A 3 bit absolute relocation */ |
| 222 | HOWTO (R_M68HC11_3B, /* type */ |
| 223 | 0, /* rightshift */ |
| 224 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 225 | 3, /* bitsize */ |
| 226 | FALSE, /* pc_relative */ |
| 227 | 0, /* bitpos */ |
| 228 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 229 | bfd_elf_generic_reloc, /* special_function */ |
| 230 | "R_M68HC12_4B", /* name */ |
| 231 | FALSE, /* partial_inplace */ |
| 232 | 0x003, /* src_mask */ |
| 233 | 0x003, /* dst_mask */ |
| 234 | FALSE), /* pcrel_offset */ |
| 235 | |
| 236 | /* A 16 bit PC-rel relocation */ |
| 237 | HOWTO (R_M68HC11_PCREL_16, /* type */ |
| 238 | 0, /* rightshift */ |
| 239 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 240 | 16, /* bitsize */ |
| 241 | TRUE, /* pc_relative */ |
| 242 | 0, /* bitpos */ |
| 243 | complain_overflow_dont, /* complain_on_overflow */ |
| 244 | bfd_elf_generic_reloc, /* special_function */ |
| 245 | "R_M68HC12_PCREL_16", /* name */ |
| 246 | FALSE, /* partial_inplace */ |
| 247 | 0xffff, /* src_mask */ |
| 248 | 0xffff, /* dst_mask */ |
| 249 | TRUE), /* pcrel_offset */ |
| 250 | |
| 251 | /* GNU extension to record C++ vtable hierarchy */ |
| 252 | HOWTO (R_M68HC11_GNU_VTINHERIT, /* type */ |
| 253 | 0, /* rightshift */ |
| 254 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 255 | 0, /* bitsize */ |
| 256 | FALSE, /* pc_relative */ |
| 257 | 0, /* bitpos */ |
| 258 | complain_overflow_dont, /* complain_on_overflow */ |
| 259 | NULL, /* special_function */ |
| 260 | "R_M68HC11_GNU_VTINHERIT", /* name */ |
| 261 | FALSE, /* partial_inplace */ |
| 262 | 0, /* src_mask */ |
| 263 | 0, /* dst_mask */ |
| 264 | FALSE), /* pcrel_offset */ |
| 265 | |
| 266 | /* GNU extension to record C++ vtable member usage */ |
| 267 | HOWTO (R_M68HC11_GNU_VTENTRY, /* type */ |
| 268 | 0, /* rightshift */ |
| 269 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 270 | 0, /* bitsize */ |
| 271 | FALSE, /* pc_relative */ |
| 272 | 0, /* bitpos */ |
| 273 | complain_overflow_dont, /* complain_on_overflow */ |
| 274 | _bfd_elf_rel_vtable_reloc_fn, /* special_function */ |
| 275 | "R_M68HC11_GNU_VTENTRY", /* name */ |
| 276 | FALSE, /* partial_inplace */ |
| 277 | 0, /* src_mask */ |
| 278 | 0, /* dst_mask */ |
| 279 | FALSE), /* pcrel_offset */ |
| 280 | |
| 281 | /* A 24 bit relocation */ |
| 282 | HOWTO (R_M68HC11_24, /* type */ |
| 283 | 0, /* rightshift */ |
| 284 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 285 | 24, /* bitsize */ |
| 286 | FALSE, /* pc_relative */ |
| 287 | 0, /* bitpos */ |
| 288 | complain_overflow_dont, /* complain_on_overflow */ |
| 289 | m68hc11_elf_special_reloc, /* special_function */ |
| 290 | "R_M68HC12_24", /* name */ |
| 291 | FALSE, /* partial_inplace */ |
| 292 | 0xffffff, /* src_mask */ |
| 293 | 0xffffff, /* dst_mask */ |
| 294 | FALSE), /* pcrel_offset */ |
| 295 | |
| 296 | /* A 16-bit low relocation */ |
| 297 | HOWTO (R_M68HC11_LO16, /* type */ |
| 298 | 0, /* rightshift */ |
| 299 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 300 | 16, /* bitsize */ |
| 301 | FALSE, /* pc_relative */ |
| 302 | 0, /* bitpos */ |
| 303 | complain_overflow_dont, /* complain_on_overflow */ |
| 304 | m68hc11_elf_special_reloc,/* special_function */ |
| 305 | "R_M68HC12_LO16", /* name */ |
| 306 | FALSE, /* partial_inplace */ |
| 307 | 0xffff, /* src_mask */ |
| 308 | 0xffff, /* dst_mask */ |
| 309 | FALSE), /* pcrel_offset */ |
| 310 | |
| 311 | /* A page relocation */ |
| 312 | HOWTO (R_M68HC11_PAGE, /* type */ |
| 313 | 0, /* rightshift */ |
| 314 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 315 | 8, /* bitsize */ |
| 316 | FALSE, /* pc_relative */ |
| 317 | 0, /* bitpos */ |
| 318 | complain_overflow_dont, /* complain_on_overflow */ |
| 319 | m68hc11_elf_special_reloc,/* special_function */ |
| 320 | "R_M68HC12_PAGE", /* name */ |
| 321 | FALSE, /* partial_inplace */ |
| 322 | 0x00ff, /* src_mask */ |
| 323 | 0x00ff, /* dst_mask */ |
| 324 | FALSE), /* pcrel_offset */ |
| 325 | |
| 326 | EMPTY_HOWTO (14), |
| 327 | EMPTY_HOWTO (15), |
| 328 | EMPTY_HOWTO (16), |
| 329 | EMPTY_HOWTO (17), |
| 330 | EMPTY_HOWTO (18), |
| 331 | EMPTY_HOWTO (19), |
| 332 | |
| 333 | /* Mark beginning of a jump instruction (any form). */ |
| 334 | HOWTO (R_M68HC11_RL_JUMP, /* type */ |
| 335 | 0, /* rightshift */ |
| 336 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 337 | 0, /* bitsize */ |
| 338 | FALSE, /* pc_relative */ |
| 339 | 0, /* bitpos */ |
| 340 | complain_overflow_dont, /* complain_on_overflow */ |
| 341 | m68hc11_elf_ignore_reloc, /* special_function */ |
| 342 | "R_M68HC12_RL_JUMP", /* name */ |
| 343 | TRUE, /* partial_inplace */ |
| 344 | 0, /* src_mask */ |
| 345 | 0, /* dst_mask */ |
| 346 | TRUE), /* pcrel_offset */ |
| 347 | |
| 348 | /* Mark beginning of Gcc relaxation group instruction. */ |
| 349 | HOWTO (R_M68HC11_RL_GROUP, /* type */ |
| 350 | 0, /* rightshift */ |
| 351 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 352 | 0, /* bitsize */ |
| 353 | FALSE, /* pc_relative */ |
| 354 | 0, /* bitpos */ |
| 355 | complain_overflow_dont, /* complain_on_overflow */ |
| 356 | m68hc11_elf_ignore_reloc, /* special_function */ |
| 357 | "R_M68HC12_RL_GROUP", /* name */ |
| 358 | TRUE, /* partial_inplace */ |
| 359 | 0, /* src_mask */ |
| 360 | 0, /* dst_mask */ |
| 361 | TRUE), /* pcrel_offset */ |
| 362 | }; |
| 363 | |
| 364 | /* Map BFD reloc types to M68HC11 ELF reloc types. */ |
| 365 | |
| 366 | struct m68hc11_reloc_map |
| 367 | { |
| 368 | bfd_reloc_code_real_type bfd_reloc_val; |
| 369 | unsigned char elf_reloc_val; |
| 370 | }; |
| 371 | |
| 372 | static const struct m68hc11_reloc_map m68hc11_reloc_map[] = { |
| 373 | {BFD_RELOC_NONE, R_M68HC11_NONE,}, |
| 374 | {BFD_RELOC_8, R_M68HC11_8}, |
| 375 | {BFD_RELOC_M68HC11_HI8, R_M68HC11_HI8}, |
| 376 | {BFD_RELOC_M68HC11_LO8, R_M68HC11_LO8}, |
| 377 | {BFD_RELOC_8_PCREL, R_M68HC11_PCREL_8}, |
| 378 | {BFD_RELOC_16_PCREL, R_M68HC11_PCREL_16}, |
| 379 | {BFD_RELOC_16, R_M68HC11_16}, |
| 380 | {BFD_RELOC_32, R_M68HC11_32}, |
| 381 | {BFD_RELOC_M68HC11_3B, R_M68HC11_3B}, |
| 382 | |
| 383 | {BFD_RELOC_VTABLE_INHERIT, R_M68HC11_GNU_VTINHERIT}, |
| 384 | {BFD_RELOC_VTABLE_ENTRY, R_M68HC11_GNU_VTENTRY}, |
| 385 | |
| 386 | {BFD_RELOC_M68HC11_LO16, R_M68HC11_LO16}, |
| 387 | {BFD_RELOC_M68HC11_PAGE, R_M68HC11_PAGE}, |
| 388 | {BFD_RELOC_M68HC11_24, R_M68HC11_24}, |
| 389 | |
| 390 | {BFD_RELOC_M68HC11_RL_JUMP, R_M68HC11_RL_JUMP}, |
| 391 | {BFD_RELOC_M68HC11_RL_GROUP, R_M68HC11_RL_GROUP}, |
| 392 | }; |
| 393 | |
| 394 | static reloc_howto_type * |
| 395 | bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 396 | bfd_reloc_code_real_type code) |
| 397 | { |
| 398 | unsigned int i; |
| 399 | |
| 400 | for (i = 0; |
| 401 | i < sizeof (m68hc11_reloc_map) / sizeof (struct m68hc11_reloc_map); |
| 402 | i++) |
| 403 | { |
| 404 | if (m68hc11_reloc_map[i].bfd_reloc_val == code) |
| 405 | return &elf_m68hc11_howto_table[m68hc11_reloc_map[i].elf_reloc_val]; |
| 406 | } |
| 407 | |
| 408 | return NULL; |
| 409 | } |
| 410 | |
| 411 | static reloc_howto_type * |
| 412 | bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 413 | const char *r_name) |
| 414 | { |
| 415 | unsigned int i; |
| 416 | |
| 417 | for (i = 0; |
| 418 | i < (sizeof (elf_m68hc11_howto_table) |
| 419 | / sizeof (elf_m68hc11_howto_table[0])); |
| 420 | i++) |
| 421 | if (elf_m68hc11_howto_table[i].name != NULL |
| 422 | && strcasecmp (elf_m68hc11_howto_table[i].name, r_name) == 0) |
| 423 | return &elf_m68hc11_howto_table[i]; |
| 424 | |
| 425 | return NULL; |
| 426 | } |
| 427 | |
| 428 | /* Set the howto pointer for an M68HC11 ELF reloc. */ |
| 429 | |
| 430 | static void |
| 431 | m68hc11_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED, |
| 432 | arelent *cache_ptr, Elf_Internal_Rela *dst) |
| 433 | { |
| 434 | unsigned int r_type; |
| 435 | |
| 436 | r_type = ELF32_R_TYPE (dst->r_info); |
| 437 | BFD_ASSERT (r_type < (unsigned int) R_M68HC11_max); |
| 438 | cache_ptr->howto = &elf_m68hc11_howto_table[r_type]; |
| 439 | } |
| 440 | |
| 441 | \f |
| 442 | /* Far trampoline generation. */ |
| 443 | |
| 444 | /* Build a 68HC12 trampoline stub. */ |
| 445 | static bfd_boolean |
| 446 | m68hc12_elf_build_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg) |
| 447 | { |
| 448 | struct elf32_m68hc11_stub_hash_entry *stub_entry; |
| 449 | struct bfd_link_info *info; |
| 450 | struct m68hc11_elf_link_hash_table *htab; |
| 451 | asection *stub_sec; |
| 452 | bfd *stub_bfd; |
| 453 | bfd_byte *loc; |
| 454 | bfd_vma sym_value, phys_page, phys_addr; |
| 455 | |
| 456 | /* Massage our args to the form they really have. */ |
| 457 | stub_entry = (struct elf32_m68hc11_stub_hash_entry *) gen_entry; |
| 458 | info = (struct bfd_link_info *) in_arg; |
| 459 | |
| 460 | htab = m68hc11_elf_hash_table (info); |
| 461 | |
| 462 | stub_sec = stub_entry->stub_sec; |
| 463 | |
| 464 | /* Make a note of the offset within the stubs for this entry. */ |
| 465 | stub_entry->stub_offset = stub_sec->size; |
| 466 | stub_sec->size += 7; |
| 467 | loc = stub_sec->contents + stub_entry->stub_offset; |
| 468 | |
| 469 | stub_bfd = stub_sec->owner; |
| 470 | |
| 471 | /* Create the trampoline call stub: |
| 472 | |
| 473 | ldy #%addr(symbol) |
| 474 | call %page(symbol), __trampoline |
| 475 | |
| 476 | */ |
| 477 | sym_value = (stub_entry->target_value |
| 478 | + stub_entry->target_section->output_offset |
| 479 | + stub_entry->target_section->output_section->vma); |
| 480 | phys_addr = m68hc11_phys_addr (&htab->pinfo, sym_value); |
| 481 | phys_page = m68hc11_phys_page (&htab->pinfo, sym_value); |
| 482 | |
| 483 | /* ldy #%page(sym) */ |
| 484 | bfd_put_8 (stub_bfd, 0xCD, loc); |
| 485 | bfd_put_16 (stub_bfd, phys_addr, loc + 1); |
| 486 | loc += 3; |
| 487 | |
| 488 | /* call %page(sym), __trampoline */ |
| 489 | bfd_put_8 (stub_bfd, 0x4a, loc); |
| 490 | bfd_put_16 (stub_bfd, htab->pinfo.trampoline_addr, loc + 1); |
| 491 | bfd_put_8 (stub_bfd, phys_page, loc + 3); |
| 492 | |
| 493 | return TRUE; |
| 494 | } |
| 495 | |
| 496 | /* As above, but don't actually build the stub. Just bump offset so |
| 497 | we know stub section sizes. */ |
| 498 | |
| 499 | static bfd_boolean |
| 500 | m68hc12_elf_size_one_stub (struct bfd_hash_entry *gen_entry, |
| 501 | void *in_arg ATTRIBUTE_UNUSED) |
| 502 | { |
| 503 | struct elf32_m68hc11_stub_hash_entry *stub_entry; |
| 504 | |
| 505 | /* Massage our args to the form they really have. */ |
| 506 | stub_entry = (struct elf32_m68hc11_stub_hash_entry *) gen_entry; |
| 507 | |
| 508 | stub_entry->stub_sec->size += 7; |
| 509 | return TRUE; |
| 510 | } |
| 511 | |
| 512 | /* Create a 68HC12 ELF linker hash table. */ |
| 513 | |
| 514 | static struct bfd_link_hash_table * |
| 515 | m68hc12_elf_bfd_link_hash_table_create (bfd *abfd) |
| 516 | { |
| 517 | struct m68hc11_elf_link_hash_table *ret; |
| 518 | |
| 519 | ret = m68hc11_elf_hash_table_create (abfd); |
| 520 | if (ret == (struct m68hc11_elf_link_hash_table *) NULL) |
| 521 | return NULL; |
| 522 | |
| 523 | ret->size_one_stub = m68hc12_elf_size_one_stub; |
| 524 | ret->build_one_stub = m68hc12_elf_build_one_stub; |
| 525 | |
| 526 | return &ret->root.root; |
| 527 | } |
| 528 | \f |
| 529 | static bfd_boolean |
| 530 | m68hc12_elf_set_mach_from_flags (bfd *abfd) |
| 531 | { |
| 532 | flagword flags = elf_elfheader (abfd)->e_flags; |
| 533 | |
| 534 | switch (flags & EF_M68HC11_MACH_MASK) |
| 535 | { |
| 536 | case EF_M68HC12_MACH: |
| 537 | bfd_default_set_arch_mach (abfd, bfd_arch_m68hc12, bfd_mach_m6812); |
| 538 | break; |
| 539 | case EF_M68HCS12_MACH: |
| 540 | bfd_default_set_arch_mach (abfd, bfd_arch_m68hc12, bfd_mach_m6812s); |
| 541 | break; |
| 542 | case EF_M68HC11_GENERIC: |
| 543 | bfd_default_set_arch_mach (abfd, bfd_arch_m68hc12, |
| 544 | bfd_mach_m6812_default); |
| 545 | break; |
| 546 | default: |
| 547 | return FALSE; |
| 548 | } |
| 549 | return TRUE; |
| 550 | } |
| 551 | |
| 552 | /* Specific sections: |
| 553 | - The .page0 is a data section that is mapped in [0x0000..0x00FF]. |
| 554 | Page0 accesses are faster on the M68HC12. |
| 555 | - The .vectors is the section that represents the interrupt |
| 556 | vectors. */ |
| 557 | static const struct bfd_elf_special_section elf32_m68hc12_special_sections[] = |
| 558 | { |
| 559 | { STRING_COMMA_LEN (".eeprom"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE }, |
| 560 | { STRING_COMMA_LEN (".page0"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE }, |
| 561 | { STRING_COMMA_LEN (".softregs"), 0, SHT_NOBITS, SHF_ALLOC + SHF_WRITE }, |
| 562 | { STRING_COMMA_LEN (".vectors"), 0, SHT_PROGBITS, SHF_ALLOC }, |
| 563 | { NULL, 0, 0, 0, 0 } |
| 564 | }; |
| 565 | \f |
| 566 | #define ELF_ARCH bfd_arch_m68hc12 |
| 567 | #define ELF_MACHINE_CODE EM_68HC12 |
| 568 | #define ELF_MAXPAGESIZE 0x1000 |
| 569 | |
| 570 | #define TARGET_BIG_SYM bfd_elf32_m68hc12_vec |
| 571 | #define TARGET_BIG_NAME "elf32-m68hc12" |
| 572 | |
| 573 | #define elf_info_to_howto 0 |
| 574 | #define elf_info_to_howto_rel m68hc11_info_to_howto_rel |
| 575 | #define elf_backend_check_relocs elf32_m68hc11_check_relocs |
| 576 | #define elf_backend_relocate_section elf32_m68hc11_relocate_section |
| 577 | #define elf_backend_object_p m68hc12_elf_set_mach_from_flags |
| 578 | #define elf_backend_final_write_processing 0 |
| 579 | #define elf_backend_can_gc_sections 1 |
| 580 | #define elf_backend_special_sections elf32_m68hc12_special_sections |
| 581 | #define elf_backend_post_process_headers elf32_m68hc11_post_process_headers |
| 582 | #define elf_backend_add_symbol_hook elf32_m68hc11_add_symbol_hook |
| 583 | |
| 584 | #define bfd_elf32_bfd_link_hash_table_create \ |
| 585 | m68hc12_elf_bfd_link_hash_table_create |
| 586 | #define bfd_elf32_bfd_link_hash_table_free \ |
| 587 | m68hc11_elf_bfd_link_hash_table_free |
| 588 | #define bfd_elf32_bfd_merge_private_bfd_data \ |
| 589 | _bfd_m68hc11_elf_merge_private_bfd_data |
| 590 | #define bfd_elf32_bfd_set_private_flags _bfd_m68hc11_elf_set_private_flags |
| 591 | #define bfd_elf32_bfd_print_private_bfd_data \ |
| 592 | _bfd_m68hc11_elf_print_private_bfd_data |
| 593 | |
| 594 | #include "elf32-target.h" |