| 1 | /* AVR-specific support for 32-bit ELF |
| 2 | Copyright 1999, 2000, 2001 Free Software Foundation, Inc. |
| 3 | Contributed by Denis Chertykov <denisc@overta.ru> |
| 4 | |
| 5 | This file is part of BFD, the Binary File Descriptor library. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 20 | |
| 21 | #include "bfd.h" |
| 22 | #include "sysdep.h" |
| 23 | #include "libbfd.h" |
| 24 | #include "elf-bfd.h" |
| 25 | #include "elf/avr.h" |
| 26 | |
| 27 | static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup |
| 28 | PARAMS ((bfd *abfd, bfd_reloc_code_real_type code)); |
| 29 | static void avr_info_to_howto_rela |
| 30 | PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *)); |
| 31 | static asection *elf32_avr_gc_mark_hook |
| 32 | PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *, |
| 33 | struct elf_link_hash_entry *, Elf_Internal_Sym *)); |
| 34 | static boolean elf32_avr_gc_sweep_hook |
| 35 | PARAMS ((bfd *, struct bfd_link_info *, asection *, |
| 36 | const Elf_Internal_Rela *)); |
| 37 | static boolean elf32_avr_check_relocs |
| 38 | PARAMS ((bfd *, struct bfd_link_info *, asection *, |
| 39 | const Elf_Internal_Rela *)); |
| 40 | static bfd_reloc_status_type avr_final_link_relocate |
| 41 | PARAMS ((reloc_howto_type *, bfd *, asection *, bfd_byte *, |
| 42 | Elf_Internal_Rela *, bfd_vma)); |
| 43 | static boolean elf32_avr_relocate_section |
| 44 | PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, |
| 45 | Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); |
| 46 | static void bfd_elf_avr_final_write_processing PARAMS ((bfd *, boolean)); |
| 47 | static boolean elf32_avr_object_p PARAMS ((bfd *)); |
| 48 | |
| 49 | /* Use RELA instead of REL */ |
| 50 | #undef USE_REL |
| 51 | |
| 52 | static reloc_howto_type elf_avr_howto_table[] = |
| 53 | { |
| 54 | HOWTO (R_AVR_NONE, /* type */ |
| 55 | 0, /* rightshift */ |
| 56 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 57 | 32, /* bitsize */ |
| 58 | false, /* pc_relative */ |
| 59 | 0, /* bitpos */ |
| 60 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 61 | bfd_elf_generic_reloc, /* special_function */ |
| 62 | "R_AVR_NONE", /* name */ |
| 63 | false, /* partial_inplace */ |
| 64 | 0, /* src_mask */ |
| 65 | 0, /* dst_mask */ |
| 66 | false), /* pcrel_offset */ |
| 67 | |
| 68 | HOWTO (R_AVR_32, /* type */ |
| 69 | 0, /* rightshift */ |
| 70 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 71 | 32, /* bitsize */ |
| 72 | false, /* pc_relative */ |
| 73 | 0, /* bitpos */ |
| 74 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 75 | bfd_elf_generic_reloc, /* special_function */ |
| 76 | "R_AVR_32", /* name */ |
| 77 | false, /* partial_inplace */ |
| 78 | 0xffffffff, /* src_mask */ |
| 79 | 0xffffffff, /* dst_mask */ |
| 80 | false), /* pcrel_offset */ |
| 81 | |
| 82 | /* A 7 bit PC relative relocation. */ |
| 83 | HOWTO (R_AVR_7_PCREL, /* type */ |
| 84 | 1, /* rightshift */ |
| 85 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 86 | 7, /* bitsize */ |
| 87 | true, /* pc_relative */ |
| 88 | 3, /* bitpos */ |
| 89 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 90 | bfd_elf_generic_reloc, /* special_function */ |
| 91 | "R_AVR_7_PCREL", /* name */ |
| 92 | false, /* partial_inplace */ |
| 93 | 0xffff, /* src_mask */ |
| 94 | 0xffff, /* dst_mask */ |
| 95 | true), /* pcrel_offset */ |
| 96 | |
| 97 | /* A 13 bit PC relative relocation. */ |
| 98 | HOWTO (R_AVR_13_PCREL, /* type */ |
| 99 | 1, /* rightshift */ |
| 100 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 101 | 13, /* bitsize */ |
| 102 | true, /* pc_relative */ |
| 103 | 0, /* bitpos */ |
| 104 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 105 | bfd_elf_generic_reloc, /* special_function */ |
| 106 | "R_AVR_13_PCREL", /* name */ |
| 107 | false, /* partial_inplace */ |
| 108 | 0xfff, /* src_mask */ |
| 109 | 0xfff, /* dst_mask */ |
| 110 | true), /* pcrel_offset */ |
| 111 | |
| 112 | /* A 16 bit absolute relocation. */ |
| 113 | HOWTO (R_AVR_16, /* type */ |
| 114 | 0, /* rightshift */ |
| 115 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 116 | 16, /* bitsize */ |
| 117 | false, /* pc_relative */ |
| 118 | 0, /* bitpos */ |
| 119 | complain_overflow_dont, /* complain_on_overflow */ |
| 120 | bfd_elf_generic_reloc, /* special_function */ |
| 121 | "R_AVR_16", /* name */ |
| 122 | false, /* partial_inplace */ |
| 123 | 0xffff, /* src_mask */ |
| 124 | 0xffff, /* dst_mask */ |
| 125 | false), /* pcrel_offset */ |
| 126 | |
| 127 | /* A 16 bit absolute relocation for command address. */ |
| 128 | HOWTO (R_AVR_16_PM, /* type */ |
| 129 | 1, /* rightshift */ |
| 130 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 131 | 16, /* bitsize */ |
| 132 | false, /* pc_relative */ |
| 133 | 0, /* bitpos */ |
| 134 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 135 | bfd_elf_generic_reloc, /* special_function */ |
| 136 | "R_AVR_16_PM", /* name */ |
| 137 | false, /* partial_inplace */ |
| 138 | 0xffff, /* src_mask */ |
| 139 | 0xffff, /* dst_mask */ |
| 140 | false), /* pcrel_offset */ |
| 141 | /* A low 8 bit absolute relocation of 16 bit address. |
| 142 | For LDI command. */ |
| 143 | HOWTO (R_AVR_LO8_LDI, /* type */ |
| 144 | 0, /* rightshift */ |
| 145 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 146 | 8, /* bitsize */ |
| 147 | false, /* pc_relative */ |
| 148 | 0, /* bitpos */ |
| 149 | complain_overflow_dont, /* complain_on_overflow */ |
| 150 | bfd_elf_generic_reloc, /* special_function */ |
| 151 | "R_AVR_LO8_LDI", /* name */ |
| 152 | false, /* partial_inplace */ |
| 153 | 0xffff, /* src_mask */ |
| 154 | 0xffff, /* dst_mask */ |
| 155 | false), /* pcrel_offset */ |
| 156 | /* A high 8 bit absolute relocation of 16 bit address. |
| 157 | For LDI command. */ |
| 158 | HOWTO (R_AVR_HI8_LDI, /* type */ |
| 159 | 8, /* rightshift */ |
| 160 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 161 | 8, /* bitsize */ |
| 162 | false, /* pc_relative */ |
| 163 | 0, /* bitpos */ |
| 164 | complain_overflow_dont, /* complain_on_overflow */ |
| 165 | bfd_elf_generic_reloc, /* special_function */ |
| 166 | "R_AVR_HI8_LDI", /* name */ |
| 167 | false, /* partial_inplace */ |
| 168 | 0xffff, /* src_mask */ |
| 169 | 0xffff, /* dst_mask */ |
| 170 | false), /* pcrel_offset */ |
| 171 | /* A high 6 bit absolute relocation of 22 bit address. |
| 172 | For LDI command. */ |
| 173 | HOWTO (R_AVR_HH8_LDI, /* type */ |
| 174 | 16, /* rightshift */ |
| 175 | 1, /* 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_AVR_HH8_LDI", /* name */ |
| 182 | false, /* partial_inplace */ |
| 183 | 0xffff, /* src_mask */ |
| 184 | 0xffff, /* dst_mask */ |
| 185 | false), /* pcrel_offset */ |
| 186 | /* A negative low 8 bit absolute relocation of 16 bit address. |
| 187 | For LDI command. */ |
| 188 | HOWTO (R_AVR_LO8_LDI_NEG, /* type */ |
| 189 | 0, /* rightshift */ |
| 190 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 191 | 8, /* bitsize */ |
| 192 | false, /* pc_relative */ |
| 193 | 0, /* bitpos */ |
| 194 | complain_overflow_dont, /* complain_on_overflow */ |
| 195 | bfd_elf_generic_reloc, /* special_function */ |
| 196 | "R_AVR_LO8_LDI_NEG", /* name */ |
| 197 | false, /* partial_inplace */ |
| 198 | 0xffff, /* src_mask */ |
| 199 | 0xffff, /* dst_mask */ |
| 200 | false), /* pcrel_offset */ |
| 201 | /* A hegative high 8 bit absolute relocation of 16 bit address. |
| 202 | For LDI command. */ |
| 203 | HOWTO (R_AVR_HI8_LDI_NEG, /* type */ |
| 204 | 8, /* rightshift */ |
| 205 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 206 | 8, /* bitsize */ |
| 207 | false, /* pc_relative */ |
| 208 | 0, /* bitpos */ |
| 209 | complain_overflow_dont, /* complain_on_overflow */ |
| 210 | bfd_elf_generic_reloc, /* special_function */ |
| 211 | "R_AVR_HI8_LDI_NEG", /* name */ |
| 212 | false, /* partial_inplace */ |
| 213 | 0xffff, /* src_mask */ |
| 214 | 0xffff, /* dst_mask */ |
| 215 | false), /* pcrel_offset */ |
| 216 | /* A hegative high 6 bit absolute relocation of 22 bit address. |
| 217 | For LDI command. */ |
| 218 | HOWTO (R_AVR_HH8_LDI_NEG, /* type */ |
| 219 | 16, /* rightshift */ |
| 220 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 221 | 8, /* bitsize */ |
| 222 | false, /* pc_relative */ |
| 223 | 0, /* bitpos */ |
| 224 | complain_overflow_dont, /* complain_on_overflow */ |
| 225 | bfd_elf_generic_reloc, /* special_function */ |
| 226 | "R_AVR_HH8_LDI_NEG", /* name */ |
| 227 | false, /* partial_inplace */ |
| 228 | 0xffff, /* src_mask */ |
| 229 | 0xffff, /* dst_mask */ |
| 230 | false), /* pcrel_offset */ |
| 231 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
| 232 | For LDI command. */ |
| 233 | HOWTO (R_AVR_LO8_LDI_PM, /* type */ |
| 234 | 1, /* rightshift */ |
| 235 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 236 | 8, /* bitsize */ |
| 237 | false, /* pc_relative */ |
| 238 | 0, /* bitpos */ |
| 239 | complain_overflow_dont, /* complain_on_overflow */ |
| 240 | bfd_elf_generic_reloc, /* special_function */ |
| 241 | "R_AVR_LO8_LDI_PM", /* name */ |
| 242 | false, /* partial_inplace */ |
| 243 | 0xffff, /* src_mask */ |
| 244 | 0xffff, /* dst_mask */ |
| 245 | false), /* pcrel_offset */ |
| 246 | /* A high 8 bit absolute relocation of 16 bit program memory address. |
| 247 | For LDI command. */ |
| 248 | HOWTO (R_AVR_HI8_LDI_PM, /* type */ |
| 249 | 9, /* rightshift */ |
| 250 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 251 | 8, /* bitsize */ |
| 252 | false, /* pc_relative */ |
| 253 | 0, /* bitpos */ |
| 254 | complain_overflow_dont, /* complain_on_overflow */ |
| 255 | bfd_elf_generic_reloc, /* special_function */ |
| 256 | "R_AVR_HI8_LDI_PM", /* name */ |
| 257 | false, /* partial_inplace */ |
| 258 | 0xffff, /* src_mask */ |
| 259 | 0xffff, /* dst_mask */ |
| 260 | false), /* pcrel_offset */ |
| 261 | /* A high 8 bit absolute relocation of 24 bit program memory address. |
| 262 | For LDI command. */ |
| 263 | HOWTO (R_AVR_HH8_LDI_PM, /* type */ |
| 264 | 17, /* rightshift */ |
| 265 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 266 | 8, /* bitsize */ |
| 267 | false, /* pc_relative */ |
| 268 | 0, /* bitpos */ |
| 269 | complain_overflow_dont, /* complain_on_overflow */ |
| 270 | bfd_elf_generic_reloc, /* special_function */ |
| 271 | "R_AVR_HH8_LDI_PM", /* name */ |
| 272 | false, /* partial_inplace */ |
| 273 | 0xffff, /* src_mask */ |
| 274 | 0xffff, /* dst_mask */ |
| 275 | false), /* pcrel_offset */ |
| 276 | /* A low 8 bit absolute relocation of a negative 24 bit |
| 277 | program memory address. For LDI command. */ |
| 278 | HOWTO (R_AVR_LO8_LDI_PM_NEG, /* type */ |
| 279 | 1, /* rightshift */ |
| 280 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 281 | 8, /* bitsize */ |
| 282 | false, /* pc_relative */ |
| 283 | 0, /* bitpos */ |
| 284 | complain_overflow_dont, /* complain_on_overflow */ |
| 285 | bfd_elf_generic_reloc, /* special_function */ |
| 286 | "R_AVR_LO8_LDI_PM_NEG", /* name */ |
| 287 | false, /* partial_inplace */ |
| 288 | 0xffff, /* src_mask */ |
| 289 | 0xffff, /* dst_mask */ |
| 290 | false), /* pcrel_offset */ |
| 291 | /* A high 8 bit absolute relocation of a negative 16 bit |
| 292 | program memory address. For LDI command. */ |
| 293 | HOWTO (R_AVR_HI8_LDI_PM_NEG, /* type */ |
| 294 | 9, /* rightshift */ |
| 295 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 296 | 8, /* bitsize */ |
| 297 | false, /* pc_relative */ |
| 298 | 0, /* bitpos */ |
| 299 | complain_overflow_dont, /* complain_on_overflow */ |
| 300 | bfd_elf_generic_reloc, /* special_function */ |
| 301 | "R_AVR_HI8_LDI_PM_NEG", /* name */ |
| 302 | false, /* partial_inplace */ |
| 303 | 0xffff, /* src_mask */ |
| 304 | 0xffff, /* dst_mask */ |
| 305 | false), /* pcrel_offset */ |
| 306 | /* A high 8 bit absolute relocation of a negative 24 bit |
| 307 | program memory address. For LDI command. */ |
| 308 | HOWTO (R_AVR_HH8_LDI_PM_NEG, /* type */ |
| 309 | 17, /* rightshift */ |
| 310 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 311 | 8, /* bitsize */ |
| 312 | false, /* pc_relative */ |
| 313 | 0, /* bitpos */ |
| 314 | complain_overflow_dont, /* complain_on_overflow */ |
| 315 | bfd_elf_generic_reloc, /* special_function */ |
| 316 | "R_AVR_HH8_LDI_PM_NEG", /* name */ |
| 317 | false, /* partial_inplace */ |
| 318 | 0xffff, /* src_mask */ |
| 319 | 0xffff, /* dst_mask */ |
| 320 | false), /* pcrel_offset */ |
| 321 | /* Relocation for CALL command in ATmega. */ |
| 322 | HOWTO (R_AVR_CALL, /* type */ |
| 323 | 1, /* rightshift */ |
| 324 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 325 | 23, /* bitsize */ |
| 326 | false, /* pc_relative */ |
| 327 | 0, /* bitpos */ |
| 328 | complain_overflow_dont, /* complain_on_overflow */ |
| 329 | bfd_elf_generic_reloc, /* special_function */ |
| 330 | "R_AVR_CALL", /* name */ |
| 331 | false, /* partial_inplace */ |
| 332 | 0xffffffff, /* src_mask */ |
| 333 | 0xffffffff, /* dst_mask */ |
| 334 | false) /* pcrel_offset */ |
| 335 | }; |
| 336 | |
| 337 | /* Map BFD reloc types to AVR ELF reloc types. */ |
| 338 | |
| 339 | struct avr_reloc_map |
| 340 | { |
| 341 | bfd_reloc_code_real_type bfd_reloc_val; |
| 342 | unsigned int elf_reloc_val; |
| 343 | }; |
| 344 | |
| 345 | static const struct avr_reloc_map avr_reloc_map[] = |
| 346 | { |
| 347 | { BFD_RELOC_NONE, R_AVR_NONE }, |
| 348 | { BFD_RELOC_32, R_AVR_32 }, |
| 349 | { BFD_RELOC_AVR_7_PCREL, R_AVR_7_PCREL }, |
| 350 | { BFD_RELOC_AVR_13_PCREL, R_AVR_13_PCREL }, |
| 351 | { BFD_RELOC_16, R_AVR_16 }, |
| 352 | { BFD_RELOC_AVR_16_PM, R_AVR_16_PM }, |
| 353 | { BFD_RELOC_AVR_LO8_LDI, R_AVR_LO8_LDI}, |
| 354 | { BFD_RELOC_AVR_HI8_LDI, R_AVR_HI8_LDI }, |
| 355 | { BFD_RELOC_AVR_HH8_LDI, R_AVR_HH8_LDI }, |
| 356 | { BFD_RELOC_AVR_LO8_LDI_NEG, R_AVR_LO8_LDI_NEG }, |
| 357 | { BFD_RELOC_AVR_HI8_LDI_NEG, R_AVR_HI8_LDI_NEG }, |
| 358 | { BFD_RELOC_AVR_HH8_LDI_NEG, R_AVR_HH8_LDI_NEG }, |
| 359 | { BFD_RELOC_AVR_LO8_LDI_PM, R_AVR_LO8_LDI_PM }, |
| 360 | { BFD_RELOC_AVR_HI8_LDI_PM, R_AVR_HI8_LDI_PM }, |
| 361 | { BFD_RELOC_AVR_HH8_LDI_PM, R_AVR_HH8_LDI_PM }, |
| 362 | { BFD_RELOC_AVR_LO8_LDI_PM_NEG, R_AVR_LO8_LDI_PM_NEG }, |
| 363 | { BFD_RELOC_AVR_HI8_LDI_PM_NEG, R_AVR_HI8_LDI_PM_NEG }, |
| 364 | { BFD_RELOC_AVR_HH8_LDI_PM_NEG, R_AVR_HH8_LDI_PM_NEG }, |
| 365 | { BFD_RELOC_AVR_CALL, R_AVR_CALL } |
| 366 | }; |
| 367 | |
| 368 | static reloc_howto_type * |
| 369 | bfd_elf32_bfd_reloc_type_lookup (abfd, code) |
| 370 | bfd *abfd ATTRIBUTE_UNUSED; |
| 371 | bfd_reloc_code_real_type code; |
| 372 | { |
| 373 | unsigned int i; |
| 374 | |
| 375 | for (i = 0; |
| 376 | i < sizeof (avr_reloc_map) / sizeof (struct avr_reloc_map); |
| 377 | i++) |
| 378 | { |
| 379 | if (avr_reloc_map[i].bfd_reloc_val == code) |
| 380 | return &elf_avr_howto_table[avr_reloc_map[i].elf_reloc_val]; |
| 381 | } |
| 382 | |
| 383 | return NULL; |
| 384 | } |
| 385 | |
| 386 | /* Set the howto pointer for an AVR ELF reloc. */ |
| 387 | |
| 388 | static void |
| 389 | avr_info_to_howto_rela (abfd, cache_ptr, dst) |
| 390 | bfd *abfd ATTRIBUTE_UNUSED; |
| 391 | arelent *cache_ptr; |
| 392 | Elf32_Internal_Rela *dst; |
| 393 | { |
| 394 | unsigned int r_type; |
| 395 | |
| 396 | r_type = ELF32_R_TYPE (dst->r_info); |
| 397 | BFD_ASSERT (r_type < (unsigned int) R_AVR_max); |
| 398 | cache_ptr->howto = &elf_avr_howto_table[r_type]; |
| 399 | } |
| 400 | |
| 401 | static asection * |
| 402 | elf32_avr_gc_mark_hook (abfd, info, rel, h, sym) |
| 403 | bfd *abfd; |
| 404 | struct bfd_link_info *info ATTRIBUTE_UNUSED; |
| 405 | Elf_Internal_Rela *rel; |
| 406 | struct elf_link_hash_entry *h; |
| 407 | Elf_Internal_Sym *sym; |
| 408 | { |
| 409 | if (h != NULL) |
| 410 | { |
| 411 | switch (ELF32_R_TYPE (rel->r_info)) |
| 412 | { |
| 413 | default: |
| 414 | switch (h->root.type) |
| 415 | { |
| 416 | case bfd_link_hash_defined: |
| 417 | case bfd_link_hash_defweak: |
| 418 | return h->root.u.def.section; |
| 419 | |
| 420 | case bfd_link_hash_common: |
| 421 | return h->root.u.c.p->section; |
| 422 | |
| 423 | default: |
| 424 | break; |
| 425 | } |
| 426 | } |
| 427 | } |
| 428 | else |
| 429 | { |
| 430 | return bfd_section_from_elf_index (abfd, sym->st_shndx); |
| 431 | } |
| 432 | |
| 433 | return NULL; |
| 434 | } |
| 435 | |
| 436 | static boolean |
| 437 | elf32_avr_gc_sweep_hook (abfd, info, sec, relocs) |
| 438 | bfd *abfd ATTRIBUTE_UNUSED; |
| 439 | struct bfd_link_info *info ATTRIBUTE_UNUSED; |
| 440 | asection *sec ATTRIBUTE_UNUSED; |
| 441 | const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED; |
| 442 | { |
| 443 | /* We don't use got and plt entries for avr. */ |
| 444 | return true; |
| 445 | } |
| 446 | |
| 447 | /* Look through the relocs for a section during the first phase. |
| 448 | Since we don't do .gots or .plts, we just need to consider the |
| 449 | virtual table relocs for gc. */ |
| 450 | |
| 451 | static boolean |
| 452 | elf32_avr_check_relocs (abfd, info, sec, relocs) |
| 453 | bfd *abfd; |
| 454 | struct bfd_link_info *info; |
| 455 | asection *sec; |
| 456 | const Elf_Internal_Rela *relocs; |
| 457 | { |
| 458 | Elf_Internal_Shdr *symtab_hdr; |
| 459 | struct elf_link_hash_entry **sym_hashes, **sym_hashes_end; |
| 460 | const Elf_Internal_Rela *rel; |
| 461 | const Elf_Internal_Rela *rel_end; |
| 462 | |
| 463 | if (info->relocateable) |
| 464 | return true; |
| 465 | |
| 466 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 467 | sym_hashes = elf_sym_hashes (abfd); |
| 468 | sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof (Elf32_External_Sym); |
| 469 | if (!elf_bad_symtab (abfd)) |
| 470 | sym_hashes_end -= symtab_hdr->sh_info; |
| 471 | |
| 472 | rel_end = relocs + sec->reloc_count; |
| 473 | for (rel = relocs; rel < rel_end; rel++) |
| 474 | { |
| 475 | struct elf_link_hash_entry *h; |
| 476 | unsigned long r_symndx; |
| 477 | |
| 478 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 479 | if (r_symndx < symtab_hdr->sh_info) |
| 480 | h = NULL; |
| 481 | else |
| 482 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 483 | } |
| 484 | |
| 485 | return true; |
| 486 | } |
| 487 | |
| 488 | /* Perform a single relocation. By default we use the standard BFD |
| 489 | routines, but a few relocs, we have to do them ourselves. */ |
| 490 | |
| 491 | static bfd_reloc_status_type |
| 492 | avr_final_link_relocate (howto, input_bfd, input_section, |
| 493 | contents, rel, relocation) |
| 494 | reloc_howto_type * howto; |
| 495 | bfd * input_bfd; |
| 496 | asection * input_section; |
| 497 | bfd_byte * contents; |
| 498 | Elf_Internal_Rela * rel; |
| 499 | bfd_vma relocation; |
| 500 | { |
| 501 | bfd_reloc_status_type r = bfd_reloc_ok; |
| 502 | bfd_vma x; |
| 503 | bfd_signed_vma srel; |
| 504 | |
| 505 | switch (howto->type) |
| 506 | { |
| 507 | case R_AVR_7_PCREL: |
| 508 | contents += rel->r_offset; |
| 509 | srel = (bfd_signed_vma) relocation; |
| 510 | srel += rel->r_addend; |
| 511 | srel -= rel->r_offset; |
| 512 | srel -= 2; /* Branch instructions add 2 to the PC... */ |
| 513 | srel -= (input_section->output_section->vma + |
| 514 | input_section->output_offset); |
| 515 | |
| 516 | if (srel & 1) |
| 517 | return bfd_reloc_outofrange; |
| 518 | if (srel > ((1 << 7) - 1) || (srel < - (1 << 7))) |
| 519 | return bfd_reloc_overflow; |
| 520 | x = bfd_get_16 (input_bfd, contents); |
| 521 | x = (x & 0xfc07) | (((srel >> 1) << 3) & 0x3f8); |
| 522 | bfd_put_16 (input_bfd, x, contents); |
| 523 | break; |
| 524 | |
| 525 | case R_AVR_13_PCREL: |
| 526 | contents += rel->r_offset; |
| 527 | srel = (bfd_signed_vma) relocation; |
| 528 | srel += rel->r_addend; |
| 529 | srel -= rel->r_offset; |
| 530 | srel -= 2; /* Branch instructions add 2 to the PC... */ |
| 531 | srel -= (input_section->output_section->vma + |
| 532 | input_section->output_offset); |
| 533 | |
| 534 | if (srel & 1) |
| 535 | return bfd_reloc_outofrange; |
| 536 | |
| 537 | /* AVR addresses commands as words. */ |
| 538 | srel >>= 1; |
| 539 | |
| 540 | /* Check for overflow. */ |
| 541 | if (srel < -2048 || srel > 2047) |
| 542 | { |
| 543 | /* Apply WRAPAROUND if possible. */ |
| 544 | switch (bfd_get_mach (input_bfd)) |
| 545 | { |
| 546 | case bfd_mach_avr2: |
| 547 | case bfd_mach_avr4: |
| 548 | break; |
| 549 | |
| 550 | default: |
| 551 | return bfd_reloc_overflow; |
| 552 | } |
| 553 | } |
| 554 | |
| 555 | x = bfd_get_16 (input_bfd, contents); |
| 556 | x = (x & 0xf000) | (srel & 0xfff); |
| 557 | bfd_put_16 (input_bfd, x, contents); |
| 558 | break; |
| 559 | |
| 560 | case R_AVR_LO8_LDI: |
| 561 | contents += rel->r_offset; |
| 562 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 563 | x = bfd_get_16 (input_bfd, contents); |
| 564 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 565 | bfd_put_16 (input_bfd, x, contents); |
| 566 | break; |
| 567 | |
| 568 | case R_AVR_HI8_LDI: |
| 569 | contents += rel->r_offset; |
| 570 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 571 | srel = (srel >> 8) & 0xff; |
| 572 | x = bfd_get_16 (input_bfd, contents); |
| 573 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 574 | bfd_put_16 (input_bfd, x, contents); |
| 575 | break; |
| 576 | |
| 577 | case R_AVR_HH8_LDI: |
| 578 | contents += rel->r_offset; |
| 579 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 580 | srel = (srel >> 16) & 0xff; |
| 581 | x = bfd_get_16 (input_bfd, contents); |
| 582 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 583 | bfd_put_16 (input_bfd, x, contents); |
| 584 | break; |
| 585 | |
| 586 | case R_AVR_LO8_LDI_NEG: |
| 587 | contents += rel->r_offset; |
| 588 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 589 | srel = -srel; |
| 590 | x = bfd_get_16 (input_bfd, contents); |
| 591 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 592 | bfd_put_16 (input_bfd, x, contents); |
| 593 | break; |
| 594 | |
| 595 | case R_AVR_HI8_LDI_NEG: |
| 596 | contents += rel->r_offset; |
| 597 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 598 | srel = -srel; |
| 599 | srel = (srel >> 8) & 0xff; |
| 600 | x = bfd_get_16 (input_bfd, contents); |
| 601 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 602 | bfd_put_16 (input_bfd, x, contents); |
| 603 | break; |
| 604 | |
| 605 | case R_AVR_HH8_LDI_NEG: |
| 606 | contents += rel->r_offset; |
| 607 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 608 | srel = -srel; |
| 609 | srel = (srel >> 16) & 0xff; |
| 610 | x = bfd_get_16 (input_bfd, contents); |
| 611 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 612 | bfd_put_16 (input_bfd, x, contents); |
| 613 | break; |
| 614 | |
| 615 | case R_AVR_LO8_LDI_PM: |
| 616 | contents += rel->r_offset; |
| 617 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 618 | if (srel & 1) |
| 619 | return bfd_reloc_outofrange; |
| 620 | srel = srel >> 1; |
| 621 | x = bfd_get_16 (input_bfd, contents); |
| 622 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 623 | bfd_put_16 (input_bfd, x, contents); |
| 624 | break; |
| 625 | |
| 626 | case R_AVR_HI8_LDI_PM: |
| 627 | contents += rel->r_offset; |
| 628 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 629 | if (srel & 1) |
| 630 | return bfd_reloc_outofrange; |
| 631 | srel = srel >> 1; |
| 632 | srel = (srel >> 8) & 0xff; |
| 633 | x = bfd_get_16 (input_bfd, contents); |
| 634 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 635 | bfd_put_16 (input_bfd, x, contents); |
| 636 | break; |
| 637 | |
| 638 | case R_AVR_HH8_LDI_PM: |
| 639 | contents += rel->r_offset; |
| 640 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 641 | if (srel & 1) |
| 642 | return bfd_reloc_outofrange; |
| 643 | srel = srel >> 1; |
| 644 | srel = (srel >> 16) & 0xff; |
| 645 | x = bfd_get_16 (input_bfd, contents); |
| 646 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 647 | bfd_put_16 (input_bfd, x, contents); |
| 648 | break; |
| 649 | |
| 650 | case R_AVR_LO8_LDI_PM_NEG: |
| 651 | contents += rel->r_offset; |
| 652 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 653 | srel = -srel; |
| 654 | if (srel & 1) |
| 655 | return bfd_reloc_outofrange; |
| 656 | srel = srel >> 1; |
| 657 | x = bfd_get_16 (input_bfd, contents); |
| 658 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 659 | bfd_put_16 (input_bfd, x, contents); |
| 660 | break; |
| 661 | |
| 662 | case R_AVR_HI8_LDI_PM_NEG: |
| 663 | contents += rel->r_offset; |
| 664 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 665 | srel = -srel; |
| 666 | if (srel & 1) |
| 667 | return bfd_reloc_outofrange; |
| 668 | srel = srel >> 1; |
| 669 | srel = (srel >> 8) & 0xff; |
| 670 | x = bfd_get_16 (input_bfd, contents); |
| 671 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 672 | bfd_put_16 (input_bfd, x, contents); |
| 673 | break; |
| 674 | |
| 675 | case R_AVR_HH8_LDI_PM_NEG: |
| 676 | contents += rel->r_offset; |
| 677 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 678 | srel = -srel; |
| 679 | if (srel & 1) |
| 680 | return bfd_reloc_outofrange; |
| 681 | srel = srel >> 1; |
| 682 | srel = (srel >> 16) & 0xff; |
| 683 | x = bfd_get_16 (input_bfd, contents); |
| 684 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 685 | bfd_put_16 (input_bfd, x, contents); |
| 686 | break; |
| 687 | |
| 688 | case R_AVR_CALL: |
| 689 | contents += rel->r_offset; |
| 690 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 691 | if (srel & 1) |
| 692 | return bfd_reloc_outofrange; |
| 693 | srel = srel >> 1; |
| 694 | x = bfd_get_16 (input_bfd, contents); |
| 695 | x |= ((srel & 0x10000) | ((srel << 3) & 0x1f00000)) >> 16; |
| 696 | bfd_put_16 (input_bfd, x, contents); |
| 697 | bfd_put_16 (input_bfd, (bfd_vma) srel & 0xffff, contents+2); |
| 698 | break; |
| 699 | |
| 700 | default: |
| 701 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 702 | contents, rel->r_offset, |
| 703 | relocation, rel->r_addend); |
| 704 | } |
| 705 | |
| 706 | return r; |
| 707 | } |
| 708 | |
| 709 | /* Relocate an AVR ELF section. */ |
| 710 | static boolean |
| 711 | elf32_avr_relocate_section (output_bfd, info, input_bfd, input_section, |
| 712 | contents, relocs, local_syms, local_sections) |
| 713 | bfd *output_bfd ATTRIBUTE_UNUSED; |
| 714 | struct bfd_link_info *info; |
| 715 | bfd *input_bfd; |
| 716 | asection *input_section; |
| 717 | bfd_byte *contents; |
| 718 | Elf_Internal_Rela *relocs; |
| 719 | Elf_Internal_Sym *local_syms; |
| 720 | asection **local_sections; |
| 721 | { |
| 722 | Elf_Internal_Shdr * symtab_hdr; |
| 723 | struct elf_link_hash_entry ** sym_hashes; |
| 724 | Elf_Internal_Rela * rel; |
| 725 | Elf_Internal_Rela * relend; |
| 726 | |
| 727 | symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; |
| 728 | sym_hashes = elf_sym_hashes (input_bfd); |
| 729 | relend = relocs + input_section->reloc_count; |
| 730 | |
| 731 | for (rel = relocs; rel < relend; rel ++) |
| 732 | { |
| 733 | reloc_howto_type * howto; |
| 734 | unsigned long r_symndx; |
| 735 | Elf_Internal_Sym * sym; |
| 736 | asection * sec; |
| 737 | struct elf_link_hash_entry * h; |
| 738 | bfd_vma relocation; |
| 739 | bfd_reloc_status_type r; |
| 740 | const char * name = NULL; |
| 741 | int r_type; |
| 742 | |
| 743 | r_type = ELF32_R_TYPE (rel->r_info); |
| 744 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 745 | |
| 746 | if (info->relocateable) |
| 747 | { |
| 748 | /* This is a relocateable link. We don't have to change |
| 749 | anything, unless the reloc is against a section symbol, |
| 750 | in which case we have to adjust according to where the |
| 751 | section symbol winds up in the output section. */ |
| 752 | if (r_symndx < symtab_hdr->sh_info) |
| 753 | { |
| 754 | sym = local_syms + r_symndx; |
| 755 | |
| 756 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) |
| 757 | { |
| 758 | sec = local_sections [r_symndx]; |
| 759 | rel->r_addend += sec->output_offset + sym->st_value; |
| 760 | } |
| 761 | } |
| 762 | |
| 763 | continue; |
| 764 | } |
| 765 | |
| 766 | /* This is a final link. */ |
| 767 | howto = elf_avr_howto_table + ELF32_R_TYPE (rel->r_info); |
| 768 | h = NULL; |
| 769 | sym = NULL; |
| 770 | sec = NULL; |
| 771 | |
| 772 | if (r_symndx < symtab_hdr->sh_info) |
| 773 | { |
| 774 | sym = local_syms + r_symndx; |
| 775 | sec = local_sections [r_symndx]; |
| 776 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel); |
| 777 | |
| 778 | name = bfd_elf_string_from_elf_section |
| 779 | (input_bfd, symtab_hdr->sh_link, sym->st_name); |
| 780 | name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name; |
| 781 | } |
| 782 | else |
| 783 | { |
| 784 | h = sym_hashes [r_symndx - symtab_hdr->sh_info]; |
| 785 | |
| 786 | while (h->root.type == bfd_link_hash_indirect |
| 787 | || h->root.type == bfd_link_hash_warning) |
| 788 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 789 | |
| 790 | name = h->root.root.string; |
| 791 | |
| 792 | if (h->root.type == bfd_link_hash_defined |
| 793 | || h->root.type == bfd_link_hash_defweak) |
| 794 | { |
| 795 | sec = h->root.u.def.section; |
| 796 | relocation = (h->root.u.def.value |
| 797 | + sec->output_section->vma |
| 798 | + sec->output_offset); |
| 799 | } |
| 800 | else if (h->root.type == bfd_link_hash_undefweak) |
| 801 | { |
| 802 | relocation = 0; |
| 803 | } |
| 804 | else |
| 805 | { |
| 806 | if (! ((*info->callbacks->undefined_symbol) |
| 807 | (info, h->root.root.string, input_bfd, |
| 808 | input_section, rel->r_offset, true))) |
| 809 | return false; |
| 810 | relocation = 0; |
| 811 | } |
| 812 | } |
| 813 | |
| 814 | r = avr_final_link_relocate (howto, input_bfd, input_section, |
| 815 | contents, rel, relocation); |
| 816 | |
| 817 | if (r != bfd_reloc_ok) |
| 818 | { |
| 819 | const char * msg = (const char *) NULL; |
| 820 | |
| 821 | switch (r) |
| 822 | { |
| 823 | case bfd_reloc_overflow: |
| 824 | r = info->callbacks->reloc_overflow |
| 825 | (info, name, howto->name, (bfd_vma) 0, |
| 826 | input_bfd, input_section, rel->r_offset); |
| 827 | break; |
| 828 | |
| 829 | case bfd_reloc_undefined: |
| 830 | r = info->callbacks->undefined_symbol |
| 831 | (info, name, input_bfd, input_section, rel->r_offset, true); |
| 832 | break; |
| 833 | |
| 834 | case bfd_reloc_outofrange: |
| 835 | msg = _("internal error: out of range error"); |
| 836 | break; |
| 837 | |
| 838 | case bfd_reloc_notsupported: |
| 839 | msg = _("internal error: unsupported relocation error"); |
| 840 | break; |
| 841 | |
| 842 | case bfd_reloc_dangerous: |
| 843 | msg = _("internal error: dangerous relocation"); |
| 844 | break; |
| 845 | |
| 846 | default: |
| 847 | msg = _("internal error: unknown error"); |
| 848 | break; |
| 849 | } |
| 850 | |
| 851 | if (msg) |
| 852 | r = info->callbacks->warning |
| 853 | (info, msg, name, input_bfd, input_section, rel->r_offset); |
| 854 | |
| 855 | if (! r) |
| 856 | return false; |
| 857 | } |
| 858 | } |
| 859 | |
| 860 | return true; |
| 861 | } |
| 862 | |
| 863 | /* The final processing done just before writing out a AVR ELF object |
| 864 | file. This gets the AVR architecture right based on the machine |
| 865 | number. */ |
| 866 | |
| 867 | static void |
| 868 | bfd_elf_avr_final_write_processing (abfd, linker) |
| 869 | bfd *abfd; |
| 870 | boolean linker ATTRIBUTE_UNUSED; |
| 871 | { |
| 872 | unsigned long val; |
| 873 | |
| 874 | switch (bfd_get_mach (abfd)) |
| 875 | { |
| 876 | default: |
| 877 | case bfd_mach_avr2: |
| 878 | val = E_AVR_MACH_AVR2; |
| 879 | break; |
| 880 | |
| 881 | case bfd_mach_avr1: |
| 882 | val = E_AVR_MACH_AVR1; |
| 883 | break; |
| 884 | |
| 885 | case bfd_mach_avr3: |
| 886 | val = E_AVR_MACH_AVR3; |
| 887 | break; |
| 888 | |
| 889 | case bfd_mach_avr4: |
| 890 | val = E_AVR_MACH_AVR4; |
| 891 | break; |
| 892 | |
| 893 | case bfd_mach_avr5: |
| 894 | val = E_AVR_MACH_AVR5; |
| 895 | break; |
| 896 | } |
| 897 | |
| 898 | elf_elfheader (abfd)->e_machine = EM_AVR; |
| 899 | elf_elfheader (abfd)->e_flags &= ~ EF_AVR_MACH; |
| 900 | elf_elfheader (abfd)->e_flags |= val; |
| 901 | } |
| 902 | |
| 903 | /* Set the right machine number. */ |
| 904 | |
| 905 | static boolean |
| 906 | elf32_avr_object_p (abfd) |
| 907 | bfd *abfd; |
| 908 | { |
| 909 | unsigned int e_set = bfd_mach_avr2; |
| 910 | if (elf_elfheader (abfd)->e_machine == EM_AVR |
| 911 | || elf_elfheader (abfd)->e_machine == EM_AVR_OLD) |
| 912 | { |
| 913 | int e_mach = elf_elfheader (abfd)->e_flags & EF_AVR_MACH; |
| 914 | switch (e_mach) |
| 915 | { |
| 916 | default: |
| 917 | case E_AVR_MACH_AVR2: |
| 918 | e_set = bfd_mach_avr2; |
| 919 | break; |
| 920 | |
| 921 | case E_AVR_MACH_AVR1: |
| 922 | e_set = bfd_mach_avr1; |
| 923 | break; |
| 924 | |
| 925 | case E_AVR_MACH_AVR3: |
| 926 | e_set = bfd_mach_avr3; |
| 927 | break; |
| 928 | |
| 929 | case E_AVR_MACH_AVR4: |
| 930 | e_set = bfd_mach_avr4; |
| 931 | break; |
| 932 | |
| 933 | case E_AVR_MACH_AVR5: |
| 934 | e_set = bfd_mach_avr5; |
| 935 | break; |
| 936 | } |
| 937 | } |
| 938 | return bfd_default_set_arch_mach (abfd, bfd_arch_avr, |
| 939 | e_set); |
| 940 | } |
| 941 | |
| 942 | #define ELF_ARCH bfd_arch_avr |
| 943 | #define ELF_MACHINE_CODE EM_AVR |
| 944 | #define ELF_MACHINE_ALT1 EM_AVR_OLD |
| 945 | #define ELF_MAXPAGESIZE 1 |
| 946 | |
| 947 | #define TARGET_LITTLE_SYM bfd_elf32_avr_vec |
| 948 | #define TARGET_LITTLE_NAME "elf32-avr" |
| 949 | |
| 950 | #define elf_info_to_howto avr_info_to_howto_rela |
| 951 | #define elf_info_to_howto_rel NULL |
| 952 | #define elf_backend_relocate_section elf32_avr_relocate_section |
| 953 | #define elf_backend_gc_mark_hook elf32_avr_gc_mark_hook |
| 954 | #define elf_backend_gc_sweep_hook elf32_avr_gc_sweep_hook |
| 955 | #define elf_backend_check_relocs elf32_avr_check_relocs |
| 956 | #define elf_backend_can_gc_sections 1 |
| 957 | #define elf_backend_final_write_processing \ |
| 958 | bfd_elf_avr_final_write_processing |
| 959 | #define elf_backend_object_p elf32_avr_object_p |
| 960 | |
| 961 | #include "elf32-target.h" |