| 1 | /* AVR-specific support for 32-bit ELF |
| 2 | Copyright (C) 1999-2018 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 3 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., 51 Franklin Street - Fifth Floor, |
| 20 | Boston, MA 02110-1301, USA. */ |
| 21 | |
| 22 | #include "sysdep.h" |
| 23 | #include "bfd.h" |
| 24 | #include "libbfd.h" |
| 25 | #include "elf-bfd.h" |
| 26 | #include "elf/avr.h" |
| 27 | #include "elf32-avr.h" |
| 28 | #include "bfd_stdint.h" |
| 29 | |
| 30 | /* Enable debugging printout at stdout with this variable. */ |
| 31 | static bfd_boolean debug_relax = FALSE; |
| 32 | |
| 33 | /* Enable debugging printout at stdout with this variable. */ |
| 34 | static bfd_boolean debug_stubs = FALSE; |
| 35 | |
| 36 | static bfd_reloc_status_type |
| 37 | bfd_elf_avr_diff_reloc (bfd *, arelent *, asymbol *, void *, |
| 38 | asection *, bfd *, char **); |
| 39 | |
| 40 | /* Hash table initialization and handling. Code is taken from the hppa port |
| 41 | and adapted to the needs of AVR. */ |
| 42 | |
| 43 | /* We use two hash tables to hold information for linking avr objects. |
| 44 | |
| 45 | The first is the elf32_avr_link_hash_table which is derived from the |
| 46 | stanard ELF linker hash table. We use this as a place to attach the other |
| 47 | hash table and some static information. |
| 48 | |
| 49 | The second is the stub hash table which is derived from the base BFD |
| 50 | hash table. The stub hash table holds the information on the linker |
| 51 | stubs. */ |
| 52 | |
| 53 | struct elf32_avr_stub_hash_entry |
| 54 | { |
| 55 | /* Base hash table entry structure. */ |
| 56 | struct bfd_hash_entry bh_root; |
| 57 | |
| 58 | /* Offset within stub_sec of the beginning of this stub. */ |
| 59 | bfd_vma stub_offset; |
| 60 | |
| 61 | /* Given the symbol's value and its section we can determine its final |
| 62 | value when building the stubs (so the stub knows where to jump). */ |
| 63 | bfd_vma target_value; |
| 64 | |
| 65 | /* This way we could mark stubs to be no longer necessary. */ |
| 66 | bfd_boolean is_actually_needed; |
| 67 | }; |
| 68 | |
| 69 | struct elf32_avr_link_hash_table |
| 70 | { |
| 71 | /* The main hash table. */ |
| 72 | struct elf_link_hash_table etab; |
| 73 | |
| 74 | /* The stub hash table. */ |
| 75 | struct bfd_hash_table bstab; |
| 76 | |
| 77 | bfd_boolean no_stubs; |
| 78 | |
| 79 | /* Linker stub bfd. */ |
| 80 | bfd *stub_bfd; |
| 81 | |
| 82 | /* The stub section. */ |
| 83 | asection *stub_sec; |
| 84 | |
| 85 | /* Usually 0, unless we are generating code for a bootloader. Will |
| 86 | be initialized by elf32_avr_size_stubs to the vma offset of the |
| 87 | output section associated with the stub section. */ |
| 88 | bfd_vma vector_base; |
| 89 | |
| 90 | /* Assorted information used by elf32_avr_size_stubs. */ |
| 91 | unsigned int bfd_count; |
| 92 | unsigned int top_index; |
| 93 | asection ** input_list; |
| 94 | Elf_Internal_Sym ** all_local_syms; |
| 95 | |
| 96 | /* Tables for mapping vma beyond the 128k boundary to the address of the |
| 97 | corresponding stub. (AMT) |
| 98 | "amt_max_entry_cnt" reflects the number of entries that memory is allocated |
| 99 | for in the "amt_stub_offsets" and "amt_destination_addr" arrays. |
| 100 | "amt_entry_cnt" informs how many of these entries actually contain |
| 101 | useful data. */ |
| 102 | unsigned int amt_entry_cnt; |
| 103 | unsigned int amt_max_entry_cnt; |
| 104 | bfd_vma * amt_stub_offsets; |
| 105 | bfd_vma * amt_destination_addr; |
| 106 | }; |
| 107 | |
| 108 | /* Various hash macros and functions. */ |
| 109 | #define avr_link_hash_table(p) \ |
| 110 | /* PR 3874: Check that we have an AVR style hash table before using it. */\ |
| 111 | (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \ |
| 112 | == AVR_ELF_DATA ? ((struct elf32_avr_link_hash_table *) ((p)->hash)) : NULL) |
| 113 | |
| 114 | #define avr_stub_hash_entry(ent) \ |
| 115 | ((struct elf32_avr_stub_hash_entry *)(ent)) |
| 116 | |
| 117 | #define avr_stub_hash_lookup(table, string, create, copy) \ |
| 118 | ((struct elf32_avr_stub_hash_entry *) \ |
| 119 | bfd_hash_lookup ((table), (string), (create), (copy))) |
| 120 | |
| 121 | static reloc_howto_type elf_avr_howto_table[] = |
| 122 | { |
| 123 | HOWTO (R_AVR_NONE, /* type */ |
| 124 | 0, /* rightshift */ |
| 125 | 3, /* size (0 = byte, 1 = short, 2 = long) */ |
| 126 | 0, /* bitsize */ |
| 127 | FALSE, /* pc_relative */ |
| 128 | 0, /* bitpos */ |
| 129 | complain_overflow_dont, /* complain_on_overflow */ |
| 130 | bfd_elf_generic_reloc, /* special_function */ |
| 131 | "R_AVR_NONE", /* name */ |
| 132 | FALSE, /* partial_inplace */ |
| 133 | 0, /* src_mask */ |
| 134 | 0, /* dst_mask */ |
| 135 | FALSE), /* pcrel_offset */ |
| 136 | |
| 137 | HOWTO (R_AVR_32, /* type */ |
| 138 | 0, /* rightshift */ |
| 139 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 140 | 32, /* bitsize */ |
| 141 | FALSE, /* pc_relative */ |
| 142 | 0, /* bitpos */ |
| 143 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 144 | bfd_elf_generic_reloc, /* special_function */ |
| 145 | "R_AVR_32", /* name */ |
| 146 | FALSE, /* partial_inplace */ |
| 147 | 0xffffffff, /* src_mask */ |
| 148 | 0xffffffff, /* dst_mask */ |
| 149 | FALSE), /* pcrel_offset */ |
| 150 | |
| 151 | /* A 7 bit PC relative relocation. */ |
| 152 | HOWTO (R_AVR_7_PCREL, /* type */ |
| 153 | 1, /* rightshift */ |
| 154 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 155 | 7, /* bitsize */ |
| 156 | TRUE, /* pc_relative */ |
| 157 | 3, /* bitpos */ |
| 158 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 159 | bfd_elf_generic_reloc, /* special_function */ |
| 160 | "R_AVR_7_PCREL", /* name */ |
| 161 | FALSE, /* partial_inplace */ |
| 162 | 0xffff, /* src_mask */ |
| 163 | 0xffff, /* dst_mask */ |
| 164 | TRUE), /* pcrel_offset */ |
| 165 | |
| 166 | /* A 13 bit PC relative relocation. */ |
| 167 | HOWTO (R_AVR_13_PCREL, /* type */ |
| 168 | 1, /* rightshift */ |
| 169 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 170 | 13, /* bitsize */ |
| 171 | TRUE, /* pc_relative */ |
| 172 | 0, /* bitpos */ |
| 173 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 174 | bfd_elf_generic_reloc, /* special_function */ |
| 175 | "R_AVR_13_PCREL", /* name */ |
| 176 | FALSE, /* partial_inplace */ |
| 177 | 0xfff, /* src_mask */ |
| 178 | 0xfff, /* dst_mask */ |
| 179 | TRUE), /* pcrel_offset */ |
| 180 | |
| 181 | /* A 16 bit absolute relocation. */ |
| 182 | HOWTO (R_AVR_16, /* type */ |
| 183 | 0, /* rightshift */ |
| 184 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 185 | 16, /* bitsize */ |
| 186 | FALSE, /* pc_relative */ |
| 187 | 0, /* bitpos */ |
| 188 | complain_overflow_dont, /* complain_on_overflow */ |
| 189 | bfd_elf_generic_reloc, /* special_function */ |
| 190 | "R_AVR_16", /* name */ |
| 191 | FALSE, /* partial_inplace */ |
| 192 | 0xffff, /* src_mask */ |
| 193 | 0xffff, /* dst_mask */ |
| 194 | FALSE), /* pcrel_offset */ |
| 195 | |
| 196 | /* A 16 bit absolute relocation for command address |
| 197 | Will be changed when linker stubs are needed. */ |
| 198 | HOWTO (R_AVR_16_PM, /* type */ |
| 199 | 1, /* rightshift */ |
| 200 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 201 | 16, /* bitsize */ |
| 202 | FALSE, /* pc_relative */ |
| 203 | 0, /* bitpos */ |
| 204 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 205 | bfd_elf_generic_reloc, /* special_function */ |
| 206 | "R_AVR_16_PM", /* name */ |
| 207 | FALSE, /* partial_inplace */ |
| 208 | 0xffff, /* src_mask */ |
| 209 | 0xffff, /* dst_mask */ |
| 210 | FALSE), /* pcrel_offset */ |
| 211 | /* A low 8 bit absolute relocation of 16 bit address. |
| 212 | For LDI command. */ |
| 213 | HOWTO (R_AVR_LO8_LDI, /* type */ |
| 214 | 0, /* rightshift */ |
| 215 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 216 | 8, /* bitsize */ |
| 217 | FALSE, /* pc_relative */ |
| 218 | 0, /* bitpos */ |
| 219 | complain_overflow_dont, /* complain_on_overflow */ |
| 220 | bfd_elf_generic_reloc, /* special_function */ |
| 221 | "R_AVR_LO8_LDI", /* name */ |
| 222 | FALSE, /* partial_inplace */ |
| 223 | 0xffff, /* src_mask */ |
| 224 | 0xffff, /* dst_mask */ |
| 225 | FALSE), /* pcrel_offset */ |
| 226 | /* A high 8 bit absolute relocation of 16 bit address. |
| 227 | For LDI command. */ |
| 228 | HOWTO (R_AVR_HI8_LDI, /* type */ |
| 229 | 8, /* rightshift */ |
| 230 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 231 | 8, /* bitsize */ |
| 232 | FALSE, /* pc_relative */ |
| 233 | 0, /* bitpos */ |
| 234 | complain_overflow_dont, /* complain_on_overflow */ |
| 235 | bfd_elf_generic_reloc, /* special_function */ |
| 236 | "R_AVR_HI8_LDI", /* name */ |
| 237 | FALSE, /* partial_inplace */ |
| 238 | 0xffff, /* src_mask */ |
| 239 | 0xffff, /* dst_mask */ |
| 240 | FALSE), /* pcrel_offset */ |
| 241 | /* A high 6 bit absolute relocation of 22 bit address. |
| 242 | For LDI command. As well second most significant 8 bit value of |
| 243 | a 32 bit link-time constant. */ |
| 244 | HOWTO (R_AVR_HH8_LDI, /* type */ |
| 245 | 16, /* rightshift */ |
| 246 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 247 | 8, /* bitsize */ |
| 248 | FALSE, /* pc_relative */ |
| 249 | 0, /* bitpos */ |
| 250 | complain_overflow_dont, /* complain_on_overflow */ |
| 251 | bfd_elf_generic_reloc, /* special_function */ |
| 252 | "R_AVR_HH8_LDI", /* name */ |
| 253 | FALSE, /* partial_inplace */ |
| 254 | 0xffff, /* src_mask */ |
| 255 | 0xffff, /* dst_mask */ |
| 256 | FALSE), /* pcrel_offset */ |
| 257 | /* A negative low 8 bit absolute relocation of 16 bit address. |
| 258 | For LDI command. */ |
| 259 | HOWTO (R_AVR_LO8_LDI_NEG, /* type */ |
| 260 | 0, /* rightshift */ |
| 261 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 262 | 8, /* bitsize */ |
| 263 | FALSE, /* pc_relative */ |
| 264 | 0, /* bitpos */ |
| 265 | complain_overflow_dont, /* complain_on_overflow */ |
| 266 | bfd_elf_generic_reloc, /* special_function */ |
| 267 | "R_AVR_LO8_LDI_NEG", /* name */ |
| 268 | FALSE, /* partial_inplace */ |
| 269 | 0xffff, /* src_mask */ |
| 270 | 0xffff, /* dst_mask */ |
| 271 | FALSE), /* pcrel_offset */ |
| 272 | /* A negative high 8 bit absolute relocation of 16 bit address. |
| 273 | For LDI command. */ |
| 274 | HOWTO (R_AVR_HI8_LDI_NEG, /* type */ |
| 275 | 8, /* rightshift */ |
| 276 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 277 | 8, /* bitsize */ |
| 278 | FALSE, /* pc_relative */ |
| 279 | 0, /* bitpos */ |
| 280 | complain_overflow_dont, /* complain_on_overflow */ |
| 281 | bfd_elf_generic_reloc, /* special_function */ |
| 282 | "R_AVR_HI8_LDI_NEG", /* name */ |
| 283 | FALSE, /* partial_inplace */ |
| 284 | 0xffff, /* src_mask */ |
| 285 | 0xffff, /* dst_mask */ |
| 286 | FALSE), /* pcrel_offset */ |
| 287 | /* A negative high 6 bit absolute relocation of 22 bit address. |
| 288 | For LDI command. */ |
| 289 | HOWTO (R_AVR_HH8_LDI_NEG, /* type */ |
| 290 | 16, /* rightshift */ |
| 291 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 292 | 8, /* bitsize */ |
| 293 | FALSE, /* pc_relative */ |
| 294 | 0, /* bitpos */ |
| 295 | complain_overflow_dont, /* complain_on_overflow */ |
| 296 | bfd_elf_generic_reloc, /* special_function */ |
| 297 | "R_AVR_HH8_LDI_NEG", /* name */ |
| 298 | FALSE, /* partial_inplace */ |
| 299 | 0xffff, /* src_mask */ |
| 300 | 0xffff, /* dst_mask */ |
| 301 | FALSE), /* pcrel_offset */ |
| 302 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
| 303 | For LDI command. Will not be changed when linker stubs are needed. */ |
| 304 | HOWTO (R_AVR_LO8_LDI_PM, /* type */ |
| 305 | 1, /* rightshift */ |
| 306 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 307 | 8, /* bitsize */ |
| 308 | FALSE, /* pc_relative */ |
| 309 | 0, /* bitpos */ |
| 310 | complain_overflow_dont, /* complain_on_overflow */ |
| 311 | bfd_elf_generic_reloc, /* special_function */ |
| 312 | "R_AVR_LO8_LDI_PM", /* name */ |
| 313 | FALSE, /* partial_inplace */ |
| 314 | 0xffff, /* src_mask */ |
| 315 | 0xffff, /* dst_mask */ |
| 316 | FALSE), /* pcrel_offset */ |
| 317 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
| 318 | For LDI command. Will not be changed when linker stubs are needed. */ |
| 319 | HOWTO (R_AVR_HI8_LDI_PM, /* type */ |
| 320 | 9, /* rightshift */ |
| 321 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 322 | 8, /* bitsize */ |
| 323 | FALSE, /* pc_relative */ |
| 324 | 0, /* bitpos */ |
| 325 | complain_overflow_dont, /* complain_on_overflow */ |
| 326 | bfd_elf_generic_reloc, /* special_function */ |
| 327 | "R_AVR_HI8_LDI_PM", /* name */ |
| 328 | FALSE, /* partial_inplace */ |
| 329 | 0xffff, /* src_mask */ |
| 330 | 0xffff, /* dst_mask */ |
| 331 | FALSE), /* pcrel_offset */ |
| 332 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
| 333 | For LDI command. Will not be changed when linker stubs are needed. */ |
| 334 | HOWTO (R_AVR_HH8_LDI_PM, /* type */ |
| 335 | 17, /* rightshift */ |
| 336 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 337 | 8, /* bitsize */ |
| 338 | FALSE, /* pc_relative */ |
| 339 | 0, /* bitpos */ |
| 340 | complain_overflow_dont, /* complain_on_overflow */ |
| 341 | bfd_elf_generic_reloc, /* special_function */ |
| 342 | "R_AVR_HH8_LDI_PM", /* name */ |
| 343 | FALSE, /* partial_inplace */ |
| 344 | 0xffff, /* src_mask */ |
| 345 | 0xffff, /* dst_mask */ |
| 346 | FALSE), /* pcrel_offset */ |
| 347 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
| 348 | For LDI command. Will not be changed when linker stubs are needed. */ |
| 349 | HOWTO (R_AVR_LO8_LDI_PM_NEG, /* type */ |
| 350 | 1, /* rightshift */ |
| 351 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 352 | 8, /* bitsize */ |
| 353 | FALSE, /* pc_relative */ |
| 354 | 0, /* bitpos */ |
| 355 | complain_overflow_dont, /* complain_on_overflow */ |
| 356 | bfd_elf_generic_reloc, /* special_function */ |
| 357 | "R_AVR_LO8_LDI_PM_NEG", /* name */ |
| 358 | FALSE, /* partial_inplace */ |
| 359 | 0xffff, /* src_mask */ |
| 360 | 0xffff, /* dst_mask */ |
| 361 | FALSE), /* pcrel_offset */ |
| 362 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
| 363 | For LDI command. Will not be changed when linker stubs are needed. */ |
| 364 | HOWTO (R_AVR_HI8_LDI_PM_NEG, /* type */ |
| 365 | 9, /* rightshift */ |
| 366 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 367 | 8, /* bitsize */ |
| 368 | FALSE, /* pc_relative */ |
| 369 | 0, /* bitpos */ |
| 370 | complain_overflow_dont, /* complain_on_overflow */ |
| 371 | bfd_elf_generic_reloc, /* special_function */ |
| 372 | "R_AVR_HI8_LDI_PM_NEG", /* name */ |
| 373 | FALSE, /* partial_inplace */ |
| 374 | 0xffff, /* src_mask */ |
| 375 | 0xffff, /* dst_mask */ |
| 376 | FALSE), /* pcrel_offset */ |
| 377 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
| 378 | For LDI command. Will not be changed when linker stubs are needed. */ |
| 379 | HOWTO (R_AVR_HH8_LDI_PM_NEG, /* type */ |
| 380 | 17, /* rightshift */ |
| 381 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 382 | 8, /* bitsize */ |
| 383 | FALSE, /* pc_relative */ |
| 384 | 0, /* bitpos */ |
| 385 | complain_overflow_dont, /* complain_on_overflow */ |
| 386 | bfd_elf_generic_reloc, /* special_function */ |
| 387 | "R_AVR_HH8_LDI_PM_NEG", /* name */ |
| 388 | FALSE, /* partial_inplace */ |
| 389 | 0xffff, /* src_mask */ |
| 390 | 0xffff, /* dst_mask */ |
| 391 | FALSE), /* pcrel_offset */ |
| 392 | /* Relocation for CALL command in ATmega. */ |
| 393 | HOWTO (R_AVR_CALL, /* type */ |
| 394 | 1, /* rightshift */ |
| 395 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 396 | 23, /* bitsize */ |
| 397 | FALSE, /* pc_relative */ |
| 398 | 0, /* bitpos */ |
| 399 | complain_overflow_dont,/* complain_on_overflow */ |
| 400 | bfd_elf_generic_reloc, /* special_function */ |
| 401 | "R_AVR_CALL", /* name */ |
| 402 | FALSE, /* partial_inplace */ |
| 403 | 0xffffffff, /* src_mask */ |
| 404 | 0xffffffff, /* dst_mask */ |
| 405 | FALSE), /* pcrel_offset */ |
| 406 | /* A 16 bit absolute relocation of 16 bit address. |
| 407 | For LDI command. */ |
| 408 | HOWTO (R_AVR_LDI, /* type */ |
| 409 | 0, /* rightshift */ |
| 410 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 411 | 16, /* bitsize */ |
| 412 | FALSE, /* pc_relative */ |
| 413 | 0, /* bitpos */ |
| 414 | complain_overflow_dont,/* complain_on_overflow */ |
| 415 | bfd_elf_generic_reloc, /* special_function */ |
| 416 | "R_AVR_LDI", /* name */ |
| 417 | FALSE, /* partial_inplace */ |
| 418 | 0xffff, /* src_mask */ |
| 419 | 0xffff, /* dst_mask */ |
| 420 | FALSE), /* pcrel_offset */ |
| 421 | /* A 6 bit absolute relocation of 6 bit offset. |
| 422 | For ldd/sdd command. */ |
| 423 | HOWTO (R_AVR_6, /* type */ |
| 424 | 0, /* rightshift */ |
| 425 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 426 | 6, /* bitsize */ |
| 427 | FALSE, /* pc_relative */ |
| 428 | 0, /* bitpos */ |
| 429 | complain_overflow_dont,/* complain_on_overflow */ |
| 430 | bfd_elf_generic_reloc, /* special_function */ |
| 431 | "R_AVR_6", /* name */ |
| 432 | FALSE, /* partial_inplace */ |
| 433 | 0xffff, /* src_mask */ |
| 434 | 0xffff, /* dst_mask */ |
| 435 | FALSE), /* pcrel_offset */ |
| 436 | /* A 6 bit absolute relocation of 6 bit offset. |
| 437 | For sbiw/adiw command. */ |
| 438 | HOWTO (R_AVR_6_ADIW, /* type */ |
| 439 | 0, /* rightshift */ |
| 440 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 441 | 6, /* bitsize */ |
| 442 | FALSE, /* pc_relative */ |
| 443 | 0, /* bitpos */ |
| 444 | complain_overflow_dont,/* complain_on_overflow */ |
| 445 | bfd_elf_generic_reloc, /* special_function */ |
| 446 | "R_AVR_6_ADIW", /* name */ |
| 447 | FALSE, /* partial_inplace */ |
| 448 | 0xffff, /* src_mask */ |
| 449 | 0xffff, /* dst_mask */ |
| 450 | FALSE), /* pcrel_offset */ |
| 451 | /* Most significant 8 bit value of a 32 bit link-time constant. */ |
| 452 | HOWTO (R_AVR_MS8_LDI, /* type */ |
| 453 | 24, /* rightshift */ |
| 454 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 455 | 8, /* bitsize */ |
| 456 | FALSE, /* pc_relative */ |
| 457 | 0, /* bitpos */ |
| 458 | complain_overflow_dont, /* complain_on_overflow */ |
| 459 | bfd_elf_generic_reloc, /* special_function */ |
| 460 | "R_AVR_MS8_LDI", /* name */ |
| 461 | FALSE, /* partial_inplace */ |
| 462 | 0xffff, /* src_mask */ |
| 463 | 0xffff, /* dst_mask */ |
| 464 | FALSE), /* pcrel_offset */ |
| 465 | /* Negative most significant 8 bit value of a 32 bit link-time constant. */ |
| 466 | HOWTO (R_AVR_MS8_LDI_NEG, /* type */ |
| 467 | 24, /* rightshift */ |
| 468 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 469 | 8, /* bitsize */ |
| 470 | FALSE, /* pc_relative */ |
| 471 | 0, /* bitpos */ |
| 472 | complain_overflow_dont, /* complain_on_overflow */ |
| 473 | bfd_elf_generic_reloc, /* special_function */ |
| 474 | "R_AVR_MS8_LDI_NEG", /* name */ |
| 475 | FALSE, /* partial_inplace */ |
| 476 | 0xffff, /* src_mask */ |
| 477 | 0xffff, /* dst_mask */ |
| 478 | FALSE), /* pcrel_offset */ |
| 479 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
| 480 | For LDI command. Will be changed when linker stubs are needed. */ |
| 481 | HOWTO (R_AVR_LO8_LDI_GS, /* type */ |
| 482 | 1, /* rightshift */ |
| 483 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 484 | 8, /* bitsize */ |
| 485 | FALSE, /* pc_relative */ |
| 486 | 0, /* bitpos */ |
| 487 | complain_overflow_dont, /* complain_on_overflow */ |
| 488 | bfd_elf_generic_reloc, /* special_function */ |
| 489 | "R_AVR_LO8_LDI_GS", /* name */ |
| 490 | FALSE, /* partial_inplace */ |
| 491 | 0xffff, /* src_mask */ |
| 492 | 0xffff, /* dst_mask */ |
| 493 | FALSE), /* pcrel_offset */ |
| 494 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
| 495 | For LDI command. Will be changed when linker stubs are needed. */ |
| 496 | HOWTO (R_AVR_HI8_LDI_GS, /* type */ |
| 497 | 9, /* rightshift */ |
| 498 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 499 | 8, /* bitsize */ |
| 500 | FALSE, /* pc_relative */ |
| 501 | 0, /* bitpos */ |
| 502 | complain_overflow_dont, /* complain_on_overflow */ |
| 503 | bfd_elf_generic_reloc, /* special_function */ |
| 504 | "R_AVR_HI8_LDI_GS", /* name */ |
| 505 | FALSE, /* partial_inplace */ |
| 506 | 0xffff, /* src_mask */ |
| 507 | 0xffff, /* dst_mask */ |
| 508 | FALSE), /* pcrel_offset */ |
| 509 | /* 8 bit offset. */ |
| 510 | HOWTO (R_AVR_8, /* type */ |
| 511 | 0, /* rightshift */ |
| 512 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 513 | 8, /* bitsize */ |
| 514 | FALSE, /* pc_relative */ |
| 515 | 0, /* bitpos */ |
| 516 | complain_overflow_bitfield,/* complain_on_overflow */ |
| 517 | bfd_elf_generic_reloc, /* special_function */ |
| 518 | "R_AVR_8", /* name */ |
| 519 | FALSE, /* partial_inplace */ |
| 520 | 0x000000ff, /* src_mask */ |
| 521 | 0x000000ff, /* dst_mask */ |
| 522 | FALSE), /* pcrel_offset */ |
| 523 | /* lo8-part to use in .byte lo8(sym). */ |
| 524 | HOWTO (R_AVR_8_LO8, /* type */ |
| 525 | 0, /* rightshift */ |
| 526 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 527 | 8, /* bitsize */ |
| 528 | FALSE, /* pc_relative */ |
| 529 | 0, /* bitpos */ |
| 530 | complain_overflow_dont,/* complain_on_overflow */ |
| 531 | bfd_elf_generic_reloc, /* special_function */ |
| 532 | "R_AVR_8_LO8", /* name */ |
| 533 | FALSE, /* partial_inplace */ |
| 534 | 0xffffff, /* src_mask */ |
| 535 | 0xffffff, /* dst_mask */ |
| 536 | FALSE), /* pcrel_offset */ |
| 537 | /* hi8-part to use in .byte hi8(sym). */ |
| 538 | HOWTO (R_AVR_8_HI8, /* type */ |
| 539 | 8, /* rightshift */ |
| 540 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 541 | 8, /* bitsize */ |
| 542 | FALSE, /* pc_relative */ |
| 543 | 0, /* bitpos */ |
| 544 | complain_overflow_dont,/* complain_on_overflow */ |
| 545 | bfd_elf_generic_reloc, /* special_function */ |
| 546 | "R_AVR_8_HI8", /* name */ |
| 547 | FALSE, /* partial_inplace */ |
| 548 | 0xffffff, /* src_mask */ |
| 549 | 0xffffff, /* dst_mask */ |
| 550 | FALSE), /* pcrel_offset */ |
| 551 | /* hlo8-part to use in .byte hlo8(sym). */ |
| 552 | HOWTO (R_AVR_8_HLO8, /* type */ |
| 553 | 16, /* rightshift */ |
| 554 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 555 | 8, /* bitsize */ |
| 556 | FALSE, /* pc_relative */ |
| 557 | 0, /* bitpos */ |
| 558 | complain_overflow_dont,/* complain_on_overflow */ |
| 559 | bfd_elf_generic_reloc, /* special_function */ |
| 560 | "R_AVR_8_HLO8", /* name */ |
| 561 | FALSE, /* partial_inplace */ |
| 562 | 0xffffff, /* src_mask */ |
| 563 | 0xffffff, /* dst_mask */ |
| 564 | FALSE), /* pcrel_offset */ |
| 565 | HOWTO (R_AVR_DIFF8, /* type */ |
| 566 | 0, /* rightshift */ |
| 567 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 568 | 8, /* bitsize */ |
| 569 | FALSE, /* pc_relative */ |
| 570 | 0, /* bitpos */ |
| 571 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 572 | bfd_elf_avr_diff_reloc, /* special_function */ |
| 573 | "R_AVR_DIFF8", /* name */ |
| 574 | FALSE, /* partial_inplace */ |
| 575 | 0, /* src_mask */ |
| 576 | 0xff, /* dst_mask */ |
| 577 | FALSE), /* pcrel_offset */ |
| 578 | HOWTO (R_AVR_DIFF16, /* type */ |
| 579 | 0, /* rightshift */ |
| 580 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 581 | 16, /* bitsize */ |
| 582 | FALSE, /* pc_relative */ |
| 583 | 0, /* bitpos */ |
| 584 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 585 | bfd_elf_avr_diff_reloc,/* special_function */ |
| 586 | "R_AVR_DIFF16", /* name */ |
| 587 | FALSE, /* partial_inplace */ |
| 588 | 0, /* src_mask */ |
| 589 | 0xffff, /* dst_mask */ |
| 590 | FALSE), /* pcrel_offset */ |
| 591 | HOWTO (R_AVR_DIFF32, /* type */ |
| 592 | 0, /* rightshift */ |
| 593 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 594 | 32, /* bitsize */ |
| 595 | FALSE, /* pc_relative */ |
| 596 | 0, /* bitpos */ |
| 597 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 598 | bfd_elf_avr_diff_reloc,/* special_function */ |
| 599 | "R_AVR_DIFF32", /* name */ |
| 600 | FALSE, /* partial_inplace */ |
| 601 | 0, /* src_mask */ |
| 602 | 0xffffffff, /* dst_mask */ |
| 603 | FALSE), /* pcrel_offset */ |
| 604 | /* 7 bit immediate for LDS/STS in Tiny core. */ |
| 605 | HOWTO (R_AVR_LDS_STS_16, /* type */ |
| 606 | 0, /* rightshift */ |
| 607 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 608 | 7, /* bitsize */ |
| 609 | FALSE, /* pc_relative */ |
| 610 | 0, /* bitpos */ |
| 611 | complain_overflow_dont,/* complain_on_overflow */ |
| 612 | bfd_elf_generic_reloc, /* special_function */ |
| 613 | "R_AVR_LDS_STS_16", /* name */ |
| 614 | FALSE, /* partial_inplace */ |
| 615 | 0xffff, /* src_mask */ |
| 616 | 0xffff, /* dst_mask */ |
| 617 | FALSE), /* pcrel_offset */ |
| 618 | |
| 619 | HOWTO (R_AVR_PORT6, /* type */ |
| 620 | 0, /* rightshift */ |
| 621 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 622 | 6, /* bitsize */ |
| 623 | FALSE, /* pc_relative */ |
| 624 | 0, /* bitpos */ |
| 625 | complain_overflow_dont,/* complain_on_overflow */ |
| 626 | bfd_elf_generic_reloc, /* special_function */ |
| 627 | "R_AVR_PORT6", /* name */ |
| 628 | FALSE, /* partial_inplace */ |
| 629 | 0xffffff, /* src_mask */ |
| 630 | 0xffffff, /* dst_mask */ |
| 631 | FALSE), /* pcrel_offset */ |
| 632 | HOWTO (R_AVR_PORT5, /* type */ |
| 633 | 0, /* rightshift */ |
| 634 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 635 | 5, /* bitsize */ |
| 636 | FALSE, /* pc_relative */ |
| 637 | 0, /* bitpos */ |
| 638 | complain_overflow_dont,/* complain_on_overflow */ |
| 639 | bfd_elf_generic_reloc, /* special_function */ |
| 640 | "R_AVR_PORT5", /* name */ |
| 641 | FALSE, /* partial_inplace */ |
| 642 | 0xffffff, /* src_mask */ |
| 643 | 0xffffff, /* dst_mask */ |
| 644 | FALSE), /* pcrel_offset */ |
| 645 | |
| 646 | /* A 32 bit PC relative relocation. */ |
| 647 | HOWTO (R_AVR_32_PCREL, /* type */ |
| 648 | 0, /* rightshift */ |
| 649 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 650 | 32, /* bitsize */ |
| 651 | TRUE, /* pc_relative */ |
| 652 | 0, /* bitpos */ |
| 653 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 654 | bfd_elf_generic_reloc, /* special_function */ |
| 655 | "R_AVR_32_PCREL", /* name */ |
| 656 | FALSE, /* partial_inplace */ |
| 657 | 0xffffffff, /* src_mask */ |
| 658 | 0xffffffff, /* dst_mask */ |
| 659 | TRUE), /* pcrel_offset */ |
| 660 | }; |
| 661 | |
| 662 | /* Map BFD reloc types to AVR ELF reloc types. */ |
| 663 | |
| 664 | struct avr_reloc_map |
| 665 | { |
| 666 | bfd_reloc_code_real_type bfd_reloc_val; |
| 667 | unsigned int elf_reloc_val; |
| 668 | }; |
| 669 | |
| 670 | static const struct avr_reloc_map avr_reloc_map[] = |
| 671 | { |
| 672 | { BFD_RELOC_NONE, R_AVR_NONE }, |
| 673 | { BFD_RELOC_32, R_AVR_32 }, |
| 674 | { BFD_RELOC_AVR_7_PCREL, R_AVR_7_PCREL }, |
| 675 | { BFD_RELOC_AVR_13_PCREL, R_AVR_13_PCREL }, |
| 676 | { BFD_RELOC_16, R_AVR_16 }, |
| 677 | { BFD_RELOC_AVR_16_PM, R_AVR_16_PM }, |
| 678 | { BFD_RELOC_AVR_LO8_LDI, R_AVR_LO8_LDI}, |
| 679 | { BFD_RELOC_AVR_HI8_LDI, R_AVR_HI8_LDI }, |
| 680 | { BFD_RELOC_AVR_HH8_LDI, R_AVR_HH8_LDI }, |
| 681 | { BFD_RELOC_AVR_MS8_LDI, R_AVR_MS8_LDI }, |
| 682 | { BFD_RELOC_AVR_LO8_LDI_NEG, R_AVR_LO8_LDI_NEG }, |
| 683 | { BFD_RELOC_AVR_HI8_LDI_NEG, R_AVR_HI8_LDI_NEG }, |
| 684 | { BFD_RELOC_AVR_HH8_LDI_NEG, R_AVR_HH8_LDI_NEG }, |
| 685 | { BFD_RELOC_AVR_MS8_LDI_NEG, R_AVR_MS8_LDI_NEG }, |
| 686 | { BFD_RELOC_AVR_LO8_LDI_PM, R_AVR_LO8_LDI_PM }, |
| 687 | { BFD_RELOC_AVR_LO8_LDI_GS, R_AVR_LO8_LDI_GS }, |
| 688 | { BFD_RELOC_AVR_HI8_LDI_PM, R_AVR_HI8_LDI_PM }, |
| 689 | { BFD_RELOC_AVR_HI8_LDI_GS, R_AVR_HI8_LDI_GS }, |
| 690 | { BFD_RELOC_AVR_HH8_LDI_PM, R_AVR_HH8_LDI_PM }, |
| 691 | { BFD_RELOC_AVR_LO8_LDI_PM_NEG, R_AVR_LO8_LDI_PM_NEG }, |
| 692 | { BFD_RELOC_AVR_HI8_LDI_PM_NEG, R_AVR_HI8_LDI_PM_NEG }, |
| 693 | { BFD_RELOC_AVR_HH8_LDI_PM_NEG, R_AVR_HH8_LDI_PM_NEG }, |
| 694 | { BFD_RELOC_AVR_CALL, R_AVR_CALL }, |
| 695 | { BFD_RELOC_AVR_LDI, R_AVR_LDI }, |
| 696 | { BFD_RELOC_AVR_6, R_AVR_6 }, |
| 697 | { BFD_RELOC_AVR_6_ADIW, R_AVR_6_ADIW }, |
| 698 | { BFD_RELOC_8, R_AVR_8 }, |
| 699 | { BFD_RELOC_AVR_8_LO, R_AVR_8_LO8 }, |
| 700 | { BFD_RELOC_AVR_8_HI, R_AVR_8_HI8 }, |
| 701 | { BFD_RELOC_AVR_8_HLO, R_AVR_8_HLO8 }, |
| 702 | { BFD_RELOC_AVR_DIFF8, R_AVR_DIFF8 }, |
| 703 | { BFD_RELOC_AVR_DIFF16, R_AVR_DIFF16 }, |
| 704 | { BFD_RELOC_AVR_DIFF32, R_AVR_DIFF32 }, |
| 705 | { BFD_RELOC_AVR_LDS_STS_16, R_AVR_LDS_STS_16}, |
| 706 | { BFD_RELOC_AVR_PORT6, R_AVR_PORT6}, |
| 707 | { BFD_RELOC_AVR_PORT5, R_AVR_PORT5}, |
| 708 | { BFD_RELOC_32_PCREL, R_AVR_32_PCREL} |
| 709 | }; |
| 710 | |
| 711 | /* Meant to be filled one day with the wrap around address for the |
| 712 | specific device. I.e. should get the value 0x4000 for 16k devices, |
| 713 | 0x8000 for 32k devices and so on. |
| 714 | |
| 715 | We initialize it here with a value of 0x1000000 resulting in |
| 716 | that we will never suggest a wrap-around jump during relaxation. |
| 717 | The logic of the source code later on assumes that in |
| 718 | avr_pc_wrap_around one single bit is set. */ |
| 719 | static bfd_vma avr_pc_wrap_around = 0x10000000; |
| 720 | |
| 721 | /* If this variable holds a value different from zero, the linker relaxation |
| 722 | machine will try to optimize call/ret sequences by a single jump |
| 723 | instruction. This option could be switched off by a linker switch. */ |
| 724 | static int avr_replace_call_ret_sequences = 1; |
| 725 | \f |
| 726 | |
| 727 | /* Per-section relaxation related information for avr. */ |
| 728 | |
| 729 | struct avr_relax_info |
| 730 | { |
| 731 | /* Track the avr property records that apply to this section. */ |
| 732 | |
| 733 | struct |
| 734 | { |
| 735 | /* Number of records in the list. */ |
| 736 | unsigned count; |
| 737 | |
| 738 | /* How many records worth of space have we allocated. */ |
| 739 | unsigned allocated; |
| 740 | |
| 741 | /* The records, only COUNT records are initialised. */ |
| 742 | struct avr_property_record *items; |
| 743 | } records; |
| 744 | }; |
| 745 | |
| 746 | /* Per section data, specialised for avr. */ |
| 747 | |
| 748 | struct elf_avr_section_data |
| 749 | { |
| 750 | /* The standard data must appear first. */ |
| 751 | struct bfd_elf_section_data elf; |
| 752 | |
| 753 | /* Relaxation related information. */ |
| 754 | struct avr_relax_info relax_info; |
| 755 | }; |
| 756 | |
| 757 | /* Possibly initialise avr specific data for new section SEC from ABFD. */ |
| 758 | |
| 759 | static bfd_boolean |
| 760 | elf_avr_new_section_hook (bfd *abfd, asection *sec) |
| 761 | { |
| 762 | if (!sec->used_by_bfd) |
| 763 | { |
| 764 | struct elf_avr_section_data *sdata; |
| 765 | bfd_size_type amt = sizeof (*sdata); |
| 766 | |
| 767 | sdata = bfd_zalloc (abfd, amt); |
| 768 | if (sdata == NULL) |
| 769 | return FALSE; |
| 770 | sec->used_by_bfd = sdata; |
| 771 | } |
| 772 | |
| 773 | return _bfd_elf_new_section_hook (abfd, sec); |
| 774 | } |
| 775 | |
| 776 | /* Return a pointer to the relaxation information for SEC. */ |
| 777 | |
| 778 | static struct avr_relax_info * |
| 779 | get_avr_relax_info (asection *sec) |
| 780 | { |
| 781 | struct elf_avr_section_data *section_data; |
| 782 | |
| 783 | /* No info available if no section or if it is an output section. */ |
| 784 | if (!sec || sec == sec->output_section) |
| 785 | return NULL; |
| 786 | |
| 787 | section_data = (struct elf_avr_section_data *) elf_section_data (sec); |
| 788 | return §ion_data->relax_info; |
| 789 | } |
| 790 | |
| 791 | /* Initialise the per section relaxation information for SEC. */ |
| 792 | |
| 793 | static void |
| 794 | init_avr_relax_info (asection *sec) |
| 795 | { |
| 796 | struct avr_relax_info *relax_info = get_avr_relax_info (sec); |
| 797 | |
| 798 | relax_info->records.count = 0; |
| 799 | relax_info->records.allocated = 0; |
| 800 | relax_info->records.items = NULL; |
| 801 | } |
| 802 | |
| 803 | /* Initialize an entry in the stub hash table. */ |
| 804 | |
| 805 | static struct bfd_hash_entry * |
| 806 | stub_hash_newfunc (struct bfd_hash_entry *entry, |
| 807 | struct bfd_hash_table *table, |
| 808 | const char *string) |
| 809 | { |
| 810 | /* Allocate the structure if it has not already been allocated by a |
| 811 | subclass. */ |
| 812 | if (entry == NULL) |
| 813 | { |
| 814 | entry = bfd_hash_allocate (table, |
| 815 | sizeof (struct elf32_avr_stub_hash_entry)); |
| 816 | if (entry == NULL) |
| 817 | return entry; |
| 818 | } |
| 819 | |
| 820 | /* Call the allocation method of the superclass. */ |
| 821 | entry = bfd_hash_newfunc (entry, table, string); |
| 822 | if (entry != NULL) |
| 823 | { |
| 824 | struct elf32_avr_stub_hash_entry *hsh; |
| 825 | |
| 826 | /* Initialize the local fields. */ |
| 827 | hsh = avr_stub_hash_entry (entry); |
| 828 | hsh->stub_offset = 0; |
| 829 | hsh->target_value = 0; |
| 830 | } |
| 831 | |
| 832 | return entry; |
| 833 | } |
| 834 | |
| 835 | /* This function is just a straight passthrough to the real |
| 836 | function in linker.c. Its prupose is so that its address |
| 837 | can be compared inside the avr_link_hash_table macro. */ |
| 838 | |
| 839 | static struct bfd_hash_entry * |
| 840 | elf32_avr_link_hash_newfunc (struct bfd_hash_entry * entry, |
| 841 | struct bfd_hash_table * table, |
| 842 | const char * string) |
| 843 | { |
| 844 | return _bfd_elf_link_hash_newfunc (entry, table, string); |
| 845 | } |
| 846 | |
| 847 | /* Free the derived linker hash table. */ |
| 848 | |
| 849 | static void |
| 850 | elf32_avr_link_hash_table_free (bfd *obfd) |
| 851 | { |
| 852 | struct elf32_avr_link_hash_table *htab |
| 853 | = (struct elf32_avr_link_hash_table *) obfd->link.hash; |
| 854 | |
| 855 | /* Free the address mapping table. */ |
| 856 | if (htab->amt_stub_offsets != NULL) |
| 857 | free (htab->amt_stub_offsets); |
| 858 | if (htab->amt_destination_addr != NULL) |
| 859 | free (htab->amt_destination_addr); |
| 860 | |
| 861 | bfd_hash_table_free (&htab->bstab); |
| 862 | _bfd_elf_link_hash_table_free (obfd); |
| 863 | } |
| 864 | |
| 865 | /* Create the derived linker hash table. The AVR ELF port uses the derived |
| 866 | hash table to keep information specific to the AVR ELF linker (without |
| 867 | using static variables). */ |
| 868 | |
| 869 | static struct bfd_link_hash_table * |
| 870 | elf32_avr_link_hash_table_create (bfd *abfd) |
| 871 | { |
| 872 | struct elf32_avr_link_hash_table *htab; |
| 873 | bfd_size_type amt = sizeof (*htab); |
| 874 | |
| 875 | htab = bfd_zmalloc (amt); |
| 876 | if (htab == NULL) |
| 877 | return NULL; |
| 878 | |
| 879 | if (!_bfd_elf_link_hash_table_init (&htab->etab, abfd, |
| 880 | elf32_avr_link_hash_newfunc, |
| 881 | sizeof (struct elf_link_hash_entry), |
| 882 | AVR_ELF_DATA)) |
| 883 | { |
| 884 | free (htab); |
| 885 | return NULL; |
| 886 | } |
| 887 | |
| 888 | /* Init the stub hash table too. */ |
| 889 | if (!bfd_hash_table_init (&htab->bstab, stub_hash_newfunc, |
| 890 | sizeof (struct elf32_avr_stub_hash_entry))) |
| 891 | { |
| 892 | _bfd_elf_link_hash_table_free (abfd); |
| 893 | return NULL; |
| 894 | } |
| 895 | htab->etab.root.hash_table_free = elf32_avr_link_hash_table_free; |
| 896 | |
| 897 | return &htab->etab.root; |
| 898 | } |
| 899 | |
| 900 | /* Calculates the effective distance of a pc relative jump/call. */ |
| 901 | |
| 902 | static int |
| 903 | avr_relative_distance_considering_wrap_around (unsigned int distance) |
| 904 | { |
| 905 | unsigned int wrap_around_mask = avr_pc_wrap_around - 1; |
| 906 | int dist_with_wrap_around = distance & wrap_around_mask; |
| 907 | |
| 908 | if (dist_with_wrap_around > ((int) (avr_pc_wrap_around >> 1))) |
| 909 | dist_with_wrap_around -= avr_pc_wrap_around; |
| 910 | |
| 911 | return dist_with_wrap_around; |
| 912 | } |
| 913 | |
| 914 | |
| 915 | static reloc_howto_type * |
| 916 | bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 917 | bfd_reloc_code_real_type code) |
| 918 | { |
| 919 | unsigned int i; |
| 920 | |
| 921 | for (i = 0; |
| 922 | i < sizeof (avr_reloc_map) / sizeof (struct avr_reloc_map); |
| 923 | i++) |
| 924 | if (avr_reloc_map[i].bfd_reloc_val == code) |
| 925 | return &elf_avr_howto_table[avr_reloc_map[i].elf_reloc_val]; |
| 926 | |
| 927 | return NULL; |
| 928 | } |
| 929 | |
| 930 | static reloc_howto_type * |
| 931 | bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 932 | const char *r_name) |
| 933 | { |
| 934 | unsigned int i; |
| 935 | |
| 936 | for (i = 0; |
| 937 | i < sizeof (elf_avr_howto_table) / sizeof (elf_avr_howto_table[0]); |
| 938 | i++) |
| 939 | if (elf_avr_howto_table[i].name != NULL |
| 940 | && strcasecmp (elf_avr_howto_table[i].name, r_name) == 0) |
| 941 | return &elf_avr_howto_table[i]; |
| 942 | |
| 943 | return NULL; |
| 944 | } |
| 945 | |
| 946 | /* Set the howto pointer for an AVR ELF reloc. */ |
| 947 | |
| 948 | static bfd_boolean |
| 949 | avr_info_to_howto_rela (bfd *abfd, |
| 950 | arelent *cache_ptr, |
| 951 | Elf_Internal_Rela *dst) |
| 952 | { |
| 953 | unsigned int r_type; |
| 954 | |
| 955 | r_type = ELF32_R_TYPE (dst->r_info); |
| 956 | if (r_type >= (unsigned int) R_AVR_max) |
| 957 | { |
| 958 | /* xgettext:c-format */ |
| 959 | _bfd_error_handler (_("%pB: unsupported relocation type %#x"), |
| 960 | abfd, r_type); |
| 961 | bfd_set_error (bfd_error_bad_value); |
| 962 | return FALSE; |
| 963 | } |
| 964 | cache_ptr->howto = &elf_avr_howto_table[r_type]; |
| 965 | return TRUE; |
| 966 | } |
| 967 | |
| 968 | static bfd_boolean |
| 969 | avr_stub_is_required_for_16_bit_reloc (bfd_vma relocation) |
| 970 | { |
| 971 | return (relocation >= 0x020000); |
| 972 | } |
| 973 | |
| 974 | /* Returns the address of the corresponding stub if there is one. |
| 975 | Returns otherwise an address above 0x020000. This function |
| 976 | could also be used, if there is no knowledge on the section where |
| 977 | the destination is found. */ |
| 978 | |
| 979 | static bfd_vma |
| 980 | avr_get_stub_addr (bfd_vma srel, |
| 981 | struct elf32_avr_link_hash_table *htab) |
| 982 | { |
| 983 | unsigned int sindex; |
| 984 | bfd_vma stub_sec_addr = |
| 985 | (htab->stub_sec->output_section->vma + |
| 986 | htab->stub_sec->output_offset); |
| 987 | |
| 988 | for (sindex = 0; sindex < htab->amt_max_entry_cnt; sindex ++) |
| 989 | if (htab->amt_destination_addr[sindex] == srel) |
| 990 | return htab->amt_stub_offsets[sindex] + stub_sec_addr; |
| 991 | |
| 992 | /* Return an address that could not be reached by 16 bit relocs. */ |
| 993 | return 0x020000; |
| 994 | } |
| 995 | |
| 996 | /* Perform a diff relocation. Nothing to do, as the difference value is already |
| 997 | written into the section's contents. */ |
| 998 | |
| 999 | static bfd_reloc_status_type |
| 1000 | bfd_elf_avr_diff_reloc (bfd *abfd ATTRIBUTE_UNUSED, |
| 1001 | arelent *reloc_entry ATTRIBUTE_UNUSED, |
| 1002 | asymbol *symbol ATTRIBUTE_UNUSED, |
| 1003 | void *data ATTRIBUTE_UNUSED, |
| 1004 | asection *input_section ATTRIBUTE_UNUSED, |
| 1005 | bfd *output_bfd ATTRIBUTE_UNUSED, |
| 1006 | char **error_message ATTRIBUTE_UNUSED) |
| 1007 | { |
| 1008 | return bfd_reloc_ok; |
| 1009 | } |
| 1010 | |
| 1011 | |
| 1012 | /* Perform a single relocation. By default we use the standard BFD |
| 1013 | routines, but a few relocs, we have to do them ourselves. */ |
| 1014 | |
| 1015 | static bfd_reloc_status_type |
| 1016 | avr_final_link_relocate (reloc_howto_type * howto, |
| 1017 | bfd * input_bfd, |
| 1018 | asection * input_section, |
| 1019 | bfd_byte * contents, |
| 1020 | Elf_Internal_Rela * rel, |
| 1021 | bfd_vma relocation, |
| 1022 | struct elf32_avr_link_hash_table * htab) |
| 1023 | { |
| 1024 | bfd_reloc_status_type r = bfd_reloc_ok; |
| 1025 | bfd_vma x; |
| 1026 | bfd_signed_vma srel; |
| 1027 | bfd_signed_vma reloc_addr; |
| 1028 | bfd_boolean use_stubs = FALSE; |
| 1029 | /* Usually is 0, unless we are generating code for a bootloader. */ |
| 1030 | bfd_signed_vma base_addr = htab->vector_base; |
| 1031 | |
| 1032 | /* Absolute addr of the reloc in the final excecutable. */ |
| 1033 | reloc_addr = rel->r_offset + input_section->output_section->vma |
| 1034 | + input_section->output_offset; |
| 1035 | |
| 1036 | switch (howto->type) |
| 1037 | { |
| 1038 | case R_AVR_7_PCREL: |
| 1039 | contents += rel->r_offset; |
| 1040 | srel = (bfd_signed_vma) relocation; |
| 1041 | srel += rel->r_addend; |
| 1042 | srel -= rel->r_offset; |
| 1043 | srel -= 2; /* Branch instructions add 2 to the PC... */ |
| 1044 | srel -= (input_section->output_section->vma + |
| 1045 | input_section->output_offset); |
| 1046 | |
| 1047 | if (srel & 1) |
| 1048 | return bfd_reloc_outofrange; |
| 1049 | if (srel > ((1 << 7) - 1) || (srel < - (1 << 7))) |
| 1050 | return bfd_reloc_overflow; |
| 1051 | x = bfd_get_16 (input_bfd, contents); |
| 1052 | x = (x & 0xfc07) | (((srel >> 1) << 3) & 0x3f8); |
| 1053 | bfd_put_16 (input_bfd, x, contents); |
| 1054 | break; |
| 1055 | |
| 1056 | case R_AVR_13_PCREL: |
| 1057 | contents += rel->r_offset; |
| 1058 | srel = (bfd_signed_vma) relocation; |
| 1059 | srel += rel->r_addend; |
| 1060 | srel -= rel->r_offset; |
| 1061 | srel -= 2; /* Branch instructions add 2 to the PC... */ |
| 1062 | srel -= (input_section->output_section->vma + |
| 1063 | input_section->output_offset); |
| 1064 | |
| 1065 | if (srel & 1) |
| 1066 | return bfd_reloc_outofrange; |
| 1067 | |
| 1068 | srel = avr_relative_distance_considering_wrap_around (srel); |
| 1069 | |
| 1070 | /* AVR addresses commands as words. */ |
| 1071 | srel >>= 1; |
| 1072 | |
| 1073 | /* Check for overflow. */ |
| 1074 | if (srel < -2048 || srel > 2047) |
| 1075 | { |
| 1076 | /* Relative distance is too large. */ |
| 1077 | |
| 1078 | /* Always apply WRAPAROUND for avr2, avr25, and avr4. */ |
| 1079 | switch (bfd_get_mach (input_bfd)) |
| 1080 | { |
| 1081 | case bfd_mach_avr2: |
| 1082 | case bfd_mach_avr25: |
| 1083 | case bfd_mach_avr4: |
| 1084 | break; |
| 1085 | |
| 1086 | default: |
| 1087 | return bfd_reloc_overflow; |
| 1088 | } |
| 1089 | } |
| 1090 | |
| 1091 | x = bfd_get_16 (input_bfd, contents); |
| 1092 | x = (x & 0xf000) | (srel & 0xfff); |
| 1093 | bfd_put_16 (input_bfd, x, contents); |
| 1094 | break; |
| 1095 | |
| 1096 | case R_AVR_LO8_LDI: |
| 1097 | contents += rel->r_offset; |
| 1098 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 1099 | x = bfd_get_16 (input_bfd, contents); |
| 1100 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 1101 | bfd_put_16 (input_bfd, x, contents); |
| 1102 | break; |
| 1103 | |
| 1104 | case R_AVR_LDI: |
| 1105 | contents += rel->r_offset; |
| 1106 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 1107 | if (((srel > 0) && (srel & 0xffff) > 255) |
| 1108 | || ((srel < 0) && ((-srel) & 0xffff) > 128)) |
| 1109 | /* Remove offset for data/eeprom section. */ |
| 1110 | return bfd_reloc_overflow; |
| 1111 | |
| 1112 | x = bfd_get_16 (input_bfd, contents); |
| 1113 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 1114 | bfd_put_16 (input_bfd, x, contents); |
| 1115 | break; |
| 1116 | |
| 1117 | case R_AVR_6: |
| 1118 | contents += rel->r_offset; |
| 1119 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 1120 | if (((srel & 0xffff) > 63) || (srel < 0)) |
| 1121 | /* Remove offset for data/eeprom section. */ |
| 1122 | return bfd_reloc_overflow; |
| 1123 | x = bfd_get_16 (input_bfd, contents); |
| 1124 | x = (x & 0xd3f8) | ((srel & 7) | ((srel & (3 << 3)) << 7) |
| 1125 | | ((srel & (1 << 5)) << 8)); |
| 1126 | bfd_put_16 (input_bfd, x, contents); |
| 1127 | break; |
| 1128 | |
| 1129 | case R_AVR_6_ADIW: |
| 1130 | contents += rel->r_offset; |
| 1131 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 1132 | if (((srel & 0xffff) > 63) || (srel < 0)) |
| 1133 | /* Remove offset for data/eeprom section. */ |
| 1134 | return bfd_reloc_overflow; |
| 1135 | x = bfd_get_16 (input_bfd, contents); |
| 1136 | x = (x & 0xff30) | (srel & 0xf) | ((srel & 0x30) << 2); |
| 1137 | bfd_put_16 (input_bfd, x, contents); |
| 1138 | break; |
| 1139 | |
| 1140 | case R_AVR_HI8_LDI: |
| 1141 | contents += rel->r_offset; |
| 1142 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 1143 | srel = (srel >> 8) & 0xff; |
| 1144 | x = bfd_get_16 (input_bfd, contents); |
| 1145 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 1146 | bfd_put_16 (input_bfd, x, contents); |
| 1147 | break; |
| 1148 | |
| 1149 | case R_AVR_HH8_LDI: |
| 1150 | contents += rel->r_offset; |
| 1151 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 1152 | srel = (srel >> 16) & 0xff; |
| 1153 | x = bfd_get_16 (input_bfd, contents); |
| 1154 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 1155 | bfd_put_16 (input_bfd, x, contents); |
| 1156 | break; |
| 1157 | |
| 1158 | case R_AVR_MS8_LDI: |
| 1159 | contents += rel->r_offset; |
| 1160 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 1161 | srel = (srel >> 24) & 0xff; |
| 1162 | x = bfd_get_16 (input_bfd, contents); |
| 1163 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 1164 | bfd_put_16 (input_bfd, x, contents); |
| 1165 | break; |
| 1166 | |
| 1167 | case R_AVR_LO8_LDI_NEG: |
| 1168 | contents += rel->r_offset; |
| 1169 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 1170 | srel = -srel; |
| 1171 | x = bfd_get_16 (input_bfd, contents); |
| 1172 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 1173 | bfd_put_16 (input_bfd, x, contents); |
| 1174 | break; |
| 1175 | |
| 1176 | case R_AVR_HI8_LDI_NEG: |
| 1177 | contents += rel->r_offset; |
| 1178 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 1179 | srel = -srel; |
| 1180 | srel = (srel >> 8) & 0xff; |
| 1181 | x = bfd_get_16 (input_bfd, contents); |
| 1182 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 1183 | bfd_put_16 (input_bfd, x, contents); |
| 1184 | break; |
| 1185 | |
| 1186 | case R_AVR_HH8_LDI_NEG: |
| 1187 | contents += rel->r_offset; |
| 1188 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 1189 | srel = -srel; |
| 1190 | srel = (srel >> 16) & 0xff; |
| 1191 | x = bfd_get_16 (input_bfd, contents); |
| 1192 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 1193 | bfd_put_16 (input_bfd, x, contents); |
| 1194 | break; |
| 1195 | |
| 1196 | case R_AVR_MS8_LDI_NEG: |
| 1197 | contents += rel->r_offset; |
| 1198 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 1199 | srel = -srel; |
| 1200 | srel = (srel >> 24) & 0xff; |
| 1201 | x = bfd_get_16 (input_bfd, contents); |
| 1202 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 1203 | bfd_put_16 (input_bfd, x, contents); |
| 1204 | break; |
| 1205 | |
| 1206 | case R_AVR_LO8_LDI_GS: |
| 1207 | use_stubs = (!htab->no_stubs); |
| 1208 | /* Fall through. */ |
| 1209 | case R_AVR_LO8_LDI_PM: |
| 1210 | contents += rel->r_offset; |
| 1211 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 1212 | |
| 1213 | if (use_stubs |
| 1214 | && avr_stub_is_required_for_16_bit_reloc (srel - base_addr)) |
| 1215 | { |
| 1216 | bfd_vma old_srel = srel; |
| 1217 | |
| 1218 | /* We need to use the address of the stub instead. */ |
| 1219 | srel = avr_get_stub_addr (srel, htab); |
| 1220 | if (debug_stubs) |
| 1221 | printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for " |
| 1222 | "reloc at address 0x%x.\n", |
| 1223 | (unsigned int) srel, |
| 1224 | (unsigned int) old_srel, |
| 1225 | (unsigned int) reloc_addr); |
| 1226 | |
| 1227 | if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr)) |
| 1228 | return bfd_reloc_outofrange; |
| 1229 | } |
| 1230 | |
| 1231 | if (srel & 1) |
| 1232 | return bfd_reloc_outofrange; |
| 1233 | srel = srel >> 1; |
| 1234 | x = bfd_get_16 (input_bfd, contents); |
| 1235 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 1236 | bfd_put_16 (input_bfd, x, contents); |
| 1237 | break; |
| 1238 | |
| 1239 | case R_AVR_HI8_LDI_GS: |
| 1240 | use_stubs = (!htab->no_stubs); |
| 1241 | /* Fall through. */ |
| 1242 | case R_AVR_HI8_LDI_PM: |
| 1243 | contents += rel->r_offset; |
| 1244 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 1245 | |
| 1246 | if (use_stubs |
| 1247 | && avr_stub_is_required_for_16_bit_reloc (srel - base_addr)) |
| 1248 | { |
| 1249 | bfd_vma old_srel = srel; |
| 1250 | |
| 1251 | /* We need to use the address of the stub instead. */ |
| 1252 | srel = avr_get_stub_addr (srel, htab); |
| 1253 | if (debug_stubs) |
| 1254 | printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for " |
| 1255 | "reloc at address 0x%x.\n", |
| 1256 | (unsigned int) srel, |
| 1257 | (unsigned int) old_srel, |
| 1258 | (unsigned int) reloc_addr); |
| 1259 | |
| 1260 | if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr)) |
| 1261 | return bfd_reloc_outofrange; |
| 1262 | } |
| 1263 | |
| 1264 | if (srel & 1) |
| 1265 | return bfd_reloc_outofrange; |
| 1266 | srel = srel >> 1; |
| 1267 | srel = (srel >> 8) & 0xff; |
| 1268 | x = bfd_get_16 (input_bfd, contents); |
| 1269 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 1270 | bfd_put_16 (input_bfd, x, contents); |
| 1271 | break; |
| 1272 | |
| 1273 | case R_AVR_HH8_LDI_PM: |
| 1274 | contents += rel->r_offset; |
| 1275 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 1276 | if (srel & 1) |
| 1277 | return bfd_reloc_outofrange; |
| 1278 | srel = srel >> 1; |
| 1279 | srel = (srel >> 16) & 0xff; |
| 1280 | x = bfd_get_16 (input_bfd, contents); |
| 1281 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 1282 | bfd_put_16 (input_bfd, x, contents); |
| 1283 | break; |
| 1284 | |
| 1285 | case R_AVR_LO8_LDI_PM_NEG: |
| 1286 | contents += rel->r_offset; |
| 1287 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 1288 | srel = -srel; |
| 1289 | if (srel & 1) |
| 1290 | return bfd_reloc_outofrange; |
| 1291 | srel = srel >> 1; |
| 1292 | x = bfd_get_16 (input_bfd, contents); |
| 1293 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 1294 | bfd_put_16 (input_bfd, x, contents); |
| 1295 | break; |
| 1296 | |
| 1297 | case R_AVR_HI8_LDI_PM_NEG: |
| 1298 | contents += rel->r_offset; |
| 1299 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 1300 | srel = -srel; |
| 1301 | if (srel & 1) |
| 1302 | return bfd_reloc_outofrange; |
| 1303 | srel = srel >> 1; |
| 1304 | srel = (srel >> 8) & 0xff; |
| 1305 | x = bfd_get_16 (input_bfd, contents); |
| 1306 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 1307 | bfd_put_16 (input_bfd, x, contents); |
| 1308 | break; |
| 1309 | |
| 1310 | case R_AVR_HH8_LDI_PM_NEG: |
| 1311 | contents += rel->r_offset; |
| 1312 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 1313 | srel = -srel; |
| 1314 | if (srel & 1) |
| 1315 | return bfd_reloc_outofrange; |
| 1316 | srel = srel >> 1; |
| 1317 | srel = (srel >> 16) & 0xff; |
| 1318 | x = bfd_get_16 (input_bfd, contents); |
| 1319 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 1320 | bfd_put_16 (input_bfd, x, contents); |
| 1321 | break; |
| 1322 | |
| 1323 | case R_AVR_CALL: |
| 1324 | contents += rel->r_offset; |
| 1325 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 1326 | if (srel & 1) |
| 1327 | return bfd_reloc_outofrange; |
| 1328 | srel = srel >> 1; |
| 1329 | x = bfd_get_16 (input_bfd, contents); |
| 1330 | x |= ((srel & 0x10000) | ((srel << 3) & 0x1f00000)) >> 16; |
| 1331 | bfd_put_16 (input_bfd, x, contents); |
| 1332 | bfd_put_16 (input_bfd, (bfd_vma) srel & 0xffff, contents+2); |
| 1333 | break; |
| 1334 | |
| 1335 | case R_AVR_16_PM: |
| 1336 | use_stubs = (!htab->no_stubs); |
| 1337 | contents += rel->r_offset; |
| 1338 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 1339 | |
| 1340 | if (use_stubs |
| 1341 | && avr_stub_is_required_for_16_bit_reloc (srel - base_addr)) |
| 1342 | { |
| 1343 | bfd_vma old_srel = srel; |
| 1344 | |
| 1345 | /* We need to use the address of the stub instead. */ |
| 1346 | srel = avr_get_stub_addr (srel,htab); |
| 1347 | if (debug_stubs) |
| 1348 | printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for " |
| 1349 | "reloc at address 0x%x.\n", |
| 1350 | (unsigned int) srel, |
| 1351 | (unsigned int) old_srel, |
| 1352 | (unsigned int) reloc_addr); |
| 1353 | |
| 1354 | if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr)) |
| 1355 | return bfd_reloc_outofrange; |
| 1356 | } |
| 1357 | |
| 1358 | if (srel & 1) |
| 1359 | return bfd_reloc_outofrange; |
| 1360 | srel = srel >> 1; |
| 1361 | bfd_put_16 (input_bfd, (bfd_vma) srel &0x00ffff, contents); |
| 1362 | break; |
| 1363 | |
| 1364 | case R_AVR_DIFF8: |
| 1365 | case R_AVR_DIFF16: |
| 1366 | case R_AVR_DIFF32: |
| 1367 | /* Nothing to do here, as contents already contains the diff value. */ |
| 1368 | r = bfd_reloc_ok; |
| 1369 | break; |
| 1370 | |
| 1371 | case R_AVR_LDS_STS_16: |
| 1372 | contents += rel->r_offset; |
| 1373 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 1374 | if ((srel & 0xFFFF) < 0x40 || (srel & 0xFFFF) > 0xbf) |
| 1375 | return bfd_reloc_outofrange; |
| 1376 | srel = srel & 0x7f; |
| 1377 | x = bfd_get_16 (input_bfd, contents); |
| 1378 | x |= (srel & 0x0f) | ((srel & 0x30) << 5) | ((srel & 0x40) << 2); |
| 1379 | bfd_put_16 (input_bfd, x, contents); |
| 1380 | break; |
| 1381 | |
| 1382 | case R_AVR_PORT6: |
| 1383 | contents += rel->r_offset; |
| 1384 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 1385 | if ((srel & 0xffff) > 0x3f) |
| 1386 | return bfd_reloc_outofrange; |
| 1387 | x = bfd_get_16 (input_bfd, contents); |
| 1388 | x = (x & 0xf9f0) | ((srel & 0x30) << 5) | (srel & 0x0f); |
| 1389 | bfd_put_16 (input_bfd, x, contents); |
| 1390 | break; |
| 1391 | |
| 1392 | case R_AVR_PORT5: |
| 1393 | contents += rel->r_offset; |
| 1394 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 1395 | if ((srel & 0xffff) > 0x1f) |
| 1396 | return bfd_reloc_outofrange; |
| 1397 | x = bfd_get_16 (input_bfd, contents); |
| 1398 | x = (x & 0xff07) | ((srel & 0x1f) << 3); |
| 1399 | bfd_put_16 (input_bfd, x, contents); |
| 1400 | break; |
| 1401 | |
| 1402 | default: |
| 1403 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 1404 | contents, rel->r_offset, |
| 1405 | relocation, rel->r_addend); |
| 1406 | } |
| 1407 | |
| 1408 | return r; |
| 1409 | } |
| 1410 | |
| 1411 | /* Relocate an AVR ELF section. */ |
| 1412 | |
| 1413 | static bfd_boolean |
| 1414 | elf32_avr_relocate_section (bfd *output_bfd ATTRIBUTE_UNUSED, |
| 1415 | struct bfd_link_info *info, |
| 1416 | bfd *input_bfd, |
| 1417 | asection *input_section, |
| 1418 | bfd_byte *contents, |
| 1419 | Elf_Internal_Rela *relocs, |
| 1420 | Elf_Internal_Sym *local_syms, |
| 1421 | asection **local_sections) |
| 1422 | { |
| 1423 | Elf_Internal_Shdr * symtab_hdr; |
| 1424 | struct elf_link_hash_entry ** sym_hashes; |
| 1425 | Elf_Internal_Rela * rel; |
| 1426 | Elf_Internal_Rela * relend; |
| 1427 | struct elf32_avr_link_hash_table * htab = avr_link_hash_table (info); |
| 1428 | |
| 1429 | if (htab == NULL) |
| 1430 | return FALSE; |
| 1431 | |
| 1432 | symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; |
| 1433 | sym_hashes = elf_sym_hashes (input_bfd); |
| 1434 | relend = relocs + input_section->reloc_count; |
| 1435 | |
| 1436 | for (rel = relocs; rel < relend; rel ++) |
| 1437 | { |
| 1438 | reloc_howto_type * howto; |
| 1439 | unsigned long r_symndx; |
| 1440 | Elf_Internal_Sym * sym; |
| 1441 | asection * sec; |
| 1442 | struct elf_link_hash_entry * h; |
| 1443 | bfd_vma relocation; |
| 1444 | bfd_reloc_status_type r; |
| 1445 | const char * name; |
| 1446 | int r_type; |
| 1447 | |
| 1448 | r_type = ELF32_R_TYPE (rel->r_info); |
| 1449 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 1450 | howto = elf_avr_howto_table + r_type; |
| 1451 | h = NULL; |
| 1452 | sym = NULL; |
| 1453 | sec = NULL; |
| 1454 | |
| 1455 | if (r_symndx < symtab_hdr->sh_info) |
| 1456 | { |
| 1457 | sym = local_syms + r_symndx; |
| 1458 | sec = local_sections [r_symndx]; |
| 1459 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); |
| 1460 | |
| 1461 | name = bfd_elf_string_from_elf_section |
| 1462 | (input_bfd, symtab_hdr->sh_link, sym->st_name); |
| 1463 | name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name; |
| 1464 | } |
| 1465 | else |
| 1466 | { |
| 1467 | bfd_boolean unresolved_reloc, warned, ignored; |
| 1468 | |
| 1469 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
| 1470 | r_symndx, symtab_hdr, sym_hashes, |
| 1471 | h, sec, relocation, |
| 1472 | unresolved_reloc, warned, ignored); |
| 1473 | |
| 1474 | name = h->root.root.string; |
| 1475 | } |
| 1476 | |
| 1477 | if (sec != NULL && discarded_section (sec)) |
| 1478 | RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, |
| 1479 | rel, 1, relend, howto, 0, contents); |
| 1480 | |
| 1481 | if (bfd_link_relocatable (info)) |
| 1482 | continue; |
| 1483 | |
| 1484 | r = avr_final_link_relocate (howto, input_bfd, input_section, |
| 1485 | contents, rel, relocation, htab); |
| 1486 | |
| 1487 | if (r != bfd_reloc_ok) |
| 1488 | { |
| 1489 | const char * msg = (const char *) NULL; |
| 1490 | |
| 1491 | switch (r) |
| 1492 | { |
| 1493 | case bfd_reloc_overflow: |
| 1494 | (*info->callbacks->reloc_overflow) |
| 1495 | (info, (h ? &h->root : NULL), name, howto->name, |
| 1496 | (bfd_vma) 0, input_bfd, input_section, rel->r_offset); |
| 1497 | break; |
| 1498 | |
| 1499 | case bfd_reloc_undefined: |
| 1500 | (*info->callbacks->undefined_symbol) |
| 1501 | (info, name, input_bfd, input_section, rel->r_offset, TRUE); |
| 1502 | break; |
| 1503 | |
| 1504 | case bfd_reloc_outofrange: |
| 1505 | msg = _("internal error: out of range error"); |
| 1506 | break; |
| 1507 | |
| 1508 | case bfd_reloc_notsupported: |
| 1509 | msg = _("internal error: unsupported relocation error"); |
| 1510 | break; |
| 1511 | |
| 1512 | case bfd_reloc_dangerous: |
| 1513 | msg = _("internal error: dangerous relocation"); |
| 1514 | break; |
| 1515 | |
| 1516 | default: |
| 1517 | msg = _("internal error: unknown error"); |
| 1518 | break; |
| 1519 | } |
| 1520 | |
| 1521 | if (msg) |
| 1522 | (*info->callbacks->warning) (info, msg, name, input_bfd, |
| 1523 | input_section, rel->r_offset); |
| 1524 | } |
| 1525 | } |
| 1526 | |
| 1527 | return TRUE; |
| 1528 | } |
| 1529 | |
| 1530 | /* The final processing done just before writing out a AVR ELF object |
| 1531 | file. This gets the AVR architecture right based on the machine |
| 1532 | number. */ |
| 1533 | |
| 1534 | static void |
| 1535 | bfd_elf_avr_final_write_processing (bfd *abfd, |
| 1536 | bfd_boolean linker ATTRIBUTE_UNUSED) |
| 1537 | { |
| 1538 | unsigned long val; |
| 1539 | |
| 1540 | switch (bfd_get_mach (abfd)) |
| 1541 | { |
| 1542 | default: |
| 1543 | case bfd_mach_avr2: |
| 1544 | val = E_AVR_MACH_AVR2; |
| 1545 | break; |
| 1546 | |
| 1547 | case bfd_mach_avr1: |
| 1548 | val = E_AVR_MACH_AVR1; |
| 1549 | break; |
| 1550 | |
| 1551 | case bfd_mach_avr25: |
| 1552 | val = E_AVR_MACH_AVR25; |
| 1553 | break; |
| 1554 | |
| 1555 | case bfd_mach_avr3: |
| 1556 | val = E_AVR_MACH_AVR3; |
| 1557 | break; |
| 1558 | |
| 1559 | case bfd_mach_avr31: |
| 1560 | val = E_AVR_MACH_AVR31; |
| 1561 | break; |
| 1562 | |
| 1563 | case bfd_mach_avr35: |
| 1564 | val = E_AVR_MACH_AVR35; |
| 1565 | break; |
| 1566 | |
| 1567 | case bfd_mach_avr4: |
| 1568 | val = E_AVR_MACH_AVR4; |
| 1569 | break; |
| 1570 | |
| 1571 | case bfd_mach_avr5: |
| 1572 | val = E_AVR_MACH_AVR5; |
| 1573 | break; |
| 1574 | |
| 1575 | case bfd_mach_avr51: |
| 1576 | val = E_AVR_MACH_AVR51; |
| 1577 | break; |
| 1578 | |
| 1579 | case bfd_mach_avr6: |
| 1580 | val = E_AVR_MACH_AVR6; |
| 1581 | break; |
| 1582 | |
| 1583 | case bfd_mach_avrxmega1: |
| 1584 | val = E_AVR_MACH_XMEGA1; |
| 1585 | break; |
| 1586 | |
| 1587 | case bfd_mach_avrxmega2: |
| 1588 | val = E_AVR_MACH_XMEGA2; |
| 1589 | break; |
| 1590 | |
| 1591 | case bfd_mach_avrxmega3: |
| 1592 | val = E_AVR_MACH_XMEGA3; |
| 1593 | break; |
| 1594 | |
| 1595 | case bfd_mach_avrxmega4: |
| 1596 | val = E_AVR_MACH_XMEGA4; |
| 1597 | break; |
| 1598 | |
| 1599 | case bfd_mach_avrxmega5: |
| 1600 | val = E_AVR_MACH_XMEGA5; |
| 1601 | break; |
| 1602 | |
| 1603 | case bfd_mach_avrxmega6: |
| 1604 | val = E_AVR_MACH_XMEGA6; |
| 1605 | break; |
| 1606 | |
| 1607 | case bfd_mach_avrxmega7: |
| 1608 | val = E_AVR_MACH_XMEGA7; |
| 1609 | break; |
| 1610 | |
| 1611 | case bfd_mach_avrtiny: |
| 1612 | val = E_AVR_MACH_AVRTINY; |
| 1613 | break; |
| 1614 | } |
| 1615 | |
| 1616 | elf_elfheader (abfd)->e_machine = EM_AVR; |
| 1617 | elf_elfheader (abfd)->e_flags &= ~ EF_AVR_MACH; |
| 1618 | elf_elfheader (abfd)->e_flags |= val; |
| 1619 | } |
| 1620 | |
| 1621 | /* Set the right machine number. */ |
| 1622 | |
| 1623 | static bfd_boolean |
| 1624 | elf32_avr_object_p (bfd *abfd) |
| 1625 | { |
| 1626 | unsigned int e_set = bfd_mach_avr2; |
| 1627 | |
| 1628 | if (elf_elfheader (abfd)->e_machine == EM_AVR |
| 1629 | || elf_elfheader (abfd)->e_machine == EM_AVR_OLD) |
| 1630 | { |
| 1631 | int e_mach = elf_elfheader (abfd)->e_flags & EF_AVR_MACH; |
| 1632 | |
| 1633 | switch (e_mach) |
| 1634 | { |
| 1635 | default: |
| 1636 | case E_AVR_MACH_AVR2: |
| 1637 | e_set = bfd_mach_avr2; |
| 1638 | break; |
| 1639 | |
| 1640 | case E_AVR_MACH_AVR1: |
| 1641 | e_set = bfd_mach_avr1; |
| 1642 | break; |
| 1643 | |
| 1644 | case E_AVR_MACH_AVR25: |
| 1645 | e_set = bfd_mach_avr25; |
| 1646 | break; |
| 1647 | |
| 1648 | case E_AVR_MACH_AVR3: |
| 1649 | e_set = bfd_mach_avr3; |
| 1650 | break; |
| 1651 | |
| 1652 | case E_AVR_MACH_AVR31: |
| 1653 | e_set = bfd_mach_avr31; |
| 1654 | break; |
| 1655 | |
| 1656 | case E_AVR_MACH_AVR35: |
| 1657 | e_set = bfd_mach_avr35; |
| 1658 | break; |
| 1659 | |
| 1660 | case E_AVR_MACH_AVR4: |
| 1661 | e_set = bfd_mach_avr4; |
| 1662 | break; |
| 1663 | |
| 1664 | case E_AVR_MACH_AVR5: |
| 1665 | e_set = bfd_mach_avr5; |
| 1666 | break; |
| 1667 | |
| 1668 | case E_AVR_MACH_AVR51: |
| 1669 | e_set = bfd_mach_avr51; |
| 1670 | break; |
| 1671 | |
| 1672 | case E_AVR_MACH_AVR6: |
| 1673 | e_set = bfd_mach_avr6; |
| 1674 | break; |
| 1675 | |
| 1676 | case E_AVR_MACH_XMEGA1: |
| 1677 | e_set = bfd_mach_avrxmega1; |
| 1678 | break; |
| 1679 | |
| 1680 | case E_AVR_MACH_XMEGA2: |
| 1681 | e_set = bfd_mach_avrxmega2; |
| 1682 | break; |
| 1683 | |
| 1684 | case E_AVR_MACH_XMEGA3: |
| 1685 | e_set = bfd_mach_avrxmega3; |
| 1686 | break; |
| 1687 | |
| 1688 | case E_AVR_MACH_XMEGA4: |
| 1689 | e_set = bfd_mach_avrxmega4; |
| 1690 | break; |
| 1691 | |
| 1692 | case E_AVR_MACH_XMEGA5: |
| 1693 | e_set = bfd_mach_avrxmega5; |
| 1694 | break; |
| 1695 | |
| 1696 | case E_AVR_MACH_XMEGA6: |
| 1697 | e_set = bfd_mach_avrxmega6; |
| 1698 | break; |
| 1699 | |
| 1700 | case E_AVR_MACH_XMEGA7: |
| 1701 | e_set = bfd_mach_avrxmega7; |
| 1702 | break; |
| 1703 | |
| 1704 | case E_AVR_MACH_AVRTINY: |
| 1705 | e_set = bfd_mach_avrtiny; |
| 1706 | break; |
| 1707 | } |
| 1708 | } |
| 1709 | return bfd_default_set_arch_mach (abfd, bfd_arch_avr, |
| 1710 | e_set); |
| 1711 | } |
| 1712 | |
| 1713 | /* Returns whether the relocation type passed is a diff reloc. */ |
| 1714 | |
| 1715 | static bfd_boolean |
| 1716 | elf32_avr_is_diff_reloc (Elf_Internal_Rela *irel) |
| 1717 | { |
| 1718 | return (ELF32_R_TYPE (irel->r_info) == R_AVR_DIFF8 |
| 1719 | ||ELF32_R_TYPE (irel->r_info) == R_AVR_DIFF16 |
| 1720 | || ELF32_R_TYPE (irel->r_info) == R_AVR_DIFF32); |
| 1721 | } |
| 1722 | |
| 1723 | /* Reduce the diff value written in the section by count if the shrinked |
| 1724 | insn address happens to fall between the two symbols for which this |
| 1725 | diff reloc was emitted. */ |
| 1726 | |
| 1727 | static void |
| 1728 | elf32_avr_adjust_diff_reloc_value (bfd *abfd, |
| 1729 | struct bfd_section *isec, |
| 1730 | Elf_Internal_Rela *irel, |
| 1731 | bfd_vma symval, |
| 1732 | bfd_vma shrinked_insn_address, |
| 1733 | int count) |
| 1734 | { |
| 1735 | unsigned char *reloc_contents = NULL; |
| 1736 | unsigned char *isec_contents = elf_section_data (isec)->this_hdr.contents; |
| 1737 | if (isec_contents == NULL) |
| 1738 | { |
| 1739 | if (! bfd_malloc_and_get_section (abfd, isec, &isec_contents)) |
| 1740 | return; |
| 1741 | |
| 1742 | elf_section_data (isec)->this_hdr.contents = isec_contents; |
| 1743 | } |
| 1744 | |
| 1745 | reloc_contents = isec_contents + irel->r_offset; |
| 1746 | |
| 1747 | /* Read value written in object file. */ |
| 1748 | bfd_signed_vma x = 0; |
| 1749 | switch (ELF32_R_TYPE (irel->r_info)) |
| 1750 | { |
| 1751 | case R_AVR_DIFF8: |
| 1752 | { |
| 1753 | x = bfd_get_signed_8 (abfd, reloc_contents); |
| 1754 | break; |
| 1755 | } |
| 1756 | case R_AVR_DIFF16: |
| 1757 | { |
| 1758 | x = bfd_get_signed_16 (abfd, reloc_contents); |
| 1759 | break; |
| 1760 | } |
| 1761 | case R_AVR_DIFF32: |
| 1762 | { |
| 1763 | x = bfd_get_signed_32 (abfd, reloc_contents); |
| 1764 | break; |
| 1765 | } |
| 1766 | default: |
| 1767 | { |
| 1768 | BFD_FAIL(); |
| 1769 | } |
| 1770 | } |
| 1771 | |
| 1772 | /* For a diff reloc sym1 - sym2 the diff at assembly time (x) is written |
| 1773 | into the object file at the reloc offset. sym2's logical value is |
| 1774 | symval (<start_of_section>) + reloc addend. Compute the start and end |
| 1775 | addresses and check if the shrinked insn falls between sym1 and sym2. */ |
| 1776 | |
| 1777 | bfd_vma sym2_address = symval + irel->r_addend; |
| 1778 | bfd_vma sym1_address = sym2_address - x; |
| 1779 | |
| 1780 | /* Don't assume sym2 is bigger than sym1 - the difference |
| 1781 | could be negative. Compute start and end addresses, and |
| 1782 | use those to see if they span shrinked_insn_address. */ |
| 1783 | |
| 1784 | bfd_vma start_address = sym1_address < sym2_address |
| 1785 | ? sym1_address : sym2_address; |
| 1786 | bfd_vma end_address = sym1_address > sym2_address |
| 1787 | ? sym1_address : sym2_address; |
| 1788 | |
| 1789 | |
| 1790 | if (shrinked_insn_address >= start_address |
| 1791 | && shrinked_insn_address < end_address) |
| 1792 | { |
| 1793 | /* Reduce the diff value by count bytes and write it back into section |
| 1794 | contents. */ |
| 1795 | bfd_signed_vma new_diff = x < 0 ? x + count : x - count; |
| 1796 | |
| 1797 | if (sym2_address > shrinked_insn_address) |
| 1798 | irel->r_addend -= count; |
| 1799 | |
| 1800 | switch (ELF32_R_TYPE (irel->r_info)) |
| 1801 | { |
| 1802 | case R_AVR_DIFF8: |
| 1803 | { |
| 1804 | bfd_put_signed_8 (abfd, new_diff, reloc_contents); |
| 1805 | break; |
| 1806 | } |
| 1807 | case R_AVR_DIFF16: |
| 1808 | { |
| 1809 | bfd_put_signed_16 (abfd, new_diff & 0xFFFF, reloc_contents); |
| 1810 | break; |
| 1811 | } |
| 1812 | case R_AVR_DIFF32: |
| 1813 | { |
| 1814 | bfd_put_signed_32 (abfd, new_diff & 0xFFFFFFFF, reloc_contents); |
| 1815 | break; |
| 1816 | } |
| 1817 | default: |
| 1818 | { |
| 1819 | BFD_FAIL(); |
| 1820 | } |
| 1821 | } |
| 1822 | |
| 1823 | } |
| 1824 | } |
| 1825 | |
| 1826 | static void |
| 1827 | elf32_avr_adjust_reloc_if_spans_insn (bfd *abfd, |
| 1828 | asection *isec, |
| 1829 | Elf_Internal_Rela *irel, bfd_vma symval, |
| 1830 | bfd_vma shrinked_insn_address, |
| 1831 | bfd_vma shrink_boundary, |
| 1832 | int count) |
| 1833 | { |
| 1834 | |
| 1835 | if (elf32_avr_is_diff_reloc (irel)) |
| 1836 | { |
| 1837 | elf32_avr_adjust_diff_reloc_value (abfd, isec, irel, |
| 1838 | symval, |
| 1839 | shrinked_insn_address, |
| 1840 | count); |
| 1841 | } |
| 1842 | else |
| 1843 | { |
| 1844 | bfd_vma reloc_value = symval + irel->r_addend; |
| 1845 | bfd_boolean addend_within_shrink_boundary = |
| 1846 | (reloc_value <= shrink_boundary); |
| 1847 | |
| 1848 | bfd_boolean reloc_spans_insn = |
| 1849 | (symval <= shrinked_insn_address |
| 1850 | && reloc_value > shrinked_insn_address |
| 1851 | && addend_within_shrink_boundary); |
| 1852 | |
| 1853 | if (! reloc_spans_insn) |
| 1854 | return; |
| 1855 | |
| 1856 | irel->r_addend -= count; |
| 1857 | |
| 1858 | if (debug_relax) |
| 1859 | printf ("Relocation's addend needed to be fixed \n"); |
| 1860 | } |
| 1861 | } |
| 1862 | |
| 1863 | static bfd_boolean |
| 1864 | avr_should_move_sym (symvalue symval, |
| 1865 | bfd_vma start, |
| 1866 | bfd_vma end, |
| 1867 | bfd_boolean did_pad) |
| 1868 | { |
| 1869 | bfd_boolean sym_within_boundary = |
| 1870 | did_pad ? symval < end : symval <= end; |
| 1871 | return (symval > start && sym_within_boundary); |
| 1872 | } |
| 1873 | |
| 1874 | static bfd_boolean |
| 1875 | avr_should_reduce_sym_size (symvalue symval, |
| 1876 | symvalue symend, |
| 1877 | bfd_vma start, |
| 1878 | bfd_vma end, |
| 1879 | bfd_boolean did_pad) |
| 1880 | { |
| 1881 | bfd_boolean sym_end_within_boundary = |
| 1882 | did_pad ? symend < end : symend <= end; |
| 1883 | return (symval <= start && symend > start && sym_end_within_boundary); |
| 1884 | } |
| 1885 | |
| 1886 | static bfd_boolean |
| 1887 | avr_should_increase_sym_size (symvalue symval, |
| 1888 | symvalue symend, |
| 1889 | bfd_vma start, |
| 1890 | bfd_vma end, |
| 1891 | bfd_boolean did_pad) |
| 1892 | { |
| 1893 | return avr_should_move_sym (symval, start, end, did_pad) |
| 1894 | && symend >= end && did_pad; |
| 1895 | } |
| 1896 | |
| 1897 | /* Delete some bytes from a section while changing the size of an instruction. |
| 1898 | The parameter "addr" denotes the section-relative offset pointing just |
| 1899 | behind the shrinked instruction. "addr+count" point at the first |
| 1900 | byte just behind the original unshrinked instruction. If delete_shrinks_insn |
| 1901 | is FALSE, we are deleting redundant padding bytes from relax_info prop |
| 1902 | record handling. In that case, addr is section-relative offset of start |
| 1903 | of padding, and count is the number of padding bytes to delete. */ |
| 1904 | |
| 1905 | static bfd_boolean |
| 1906 | elf32_avr_relax_delete_bytes (bfd *abfd, |
| 1907 | asection *sec, |
| 1908 | bfd_vma addr, |
| 1909 | int count, |
| 1910 | bfd_boolean delete_shrinks_insn) |
| 1911 | { |
| 1912 | Elf_Internal_Shdr *symtab_hdr; |
| 1913 | unsigned int sec_shndx; |
| 1914 | bfd_byte *contents; |
| 1915 | Elf_Internal_Rela *irel, *irelend; |
| 1916 | Elf_Internal_Sym *isym; |
| 1917 | Elf_Internal_Sym *isymbuf = NULL; |
| 1918 | bfd_vma toaddr; |
| 1919 | struct elf_link_hash_entry **sym_hashes; |
| 1920 | struct elf_link_hash_entry **end_hashes; |
| 1921 | unsigned int symcount; |
| 1922 | struct avr_relax_info *relax_info; |
| 1923 | struct avr_property_record *prop_record = NULL; |
| 1924 | bfd_boolean did_shrink = FALSE; |
| 1925 | bfd_boolean did_pad = FALSE; |
| 1926 | |
| 1927 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 1928 | sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); |
| 1929 | contents = elf_section_data (sec)->this_hdr.contents; |
| 1930 | relax_info = get_avr_relax_info (sec); |
| 1931 | |
| 1932 | toaddr = sec->size; |
| 1933 | |
| 1934 | if (relax_info->records.count > 0) |
| 1935 | { |
| 1936 | /* There should be no property record within the range of deleted |
| 1937 | bytes, however, there might be a property record for ADDR, this is |
| 1938 | how we handle alignment directives. |
| 1939 | Find the next (if any) property record after the deleted bytes. */ |
| 1940 | unsigned int i; |
| 1941 | |
| 1942 | for (i = 0; i < relax_info->records.count; ++i) |
| 1943 | { |
| 1944 | bfd_vma offset = relax_info->records.items [i].offset; |
| 1945 | |
| 1946 | BFD_ASSERT (offset <= addr || offset >= (addr + count)); |
| 1947 | if (offset >= (addr + count)) |
| 1948 | { |
| 1949 | prop_record = &relax_info->records.items [i]; |
| 1950 | toaddr = offset; |
| 1951 | break; |
| 1952 | } |
| 1953 | } |
| 1954 | } |
| 1955 | |
| 1956 | irel = elf_section_data (sec)->relocs; |
| 1957 | irelend = irel + sec->reloc_count; |
| 1958 | |
| 1959 | /* Actually delete the bytes. */ |
| 1960 | if (toaddr - addr - count > 0) |
| 1961 | { |
| 1962 | memmove (contents + addr, contents + addr + count, |
| 1963 | (size_t) (toaddr - addr - count)); |
| 1964 | did_shrink = TRUE; |
| 1965 | } |
| 1966 | if (prop_record == NULL) |
| 1967 | { |
| 1968 | sec->size -= count; |
| 1969 | did_shrink = TRUE; |
| 1970 | } |
| 1971 | else |
| 1972 | { |
| 1973 | /* Use the property record to fill in the bytes we've opened up. */ |
| 1974 | int fill = 0; |
| 1975 | switch (prop_record->type) |
| 1976 | { |
| 1977 | case RECORD_ORG_AND_FILL: |
| 1978 | fill = prop_record->data.org.fill; |
| 1979 | /* Fall through. */ |
| 1980 | case RECORD_ORG: |
| 1981 | break; |
| 1982 | case RECORD_ALIGN_AND_FILL: |
| 1983 | fill = prop_record->data.align.fill; |
| 1984 | /* Fall through. */ |
| 1985 | case RECORD_ALIGN: |
| 1986 | prop_record->data.align.preceding_deleted += count; |
| 1987 | break; |
| 1988 | }; |
| 1989 | /* If toaddr == (addr + count), then we didn't delete anything, yet |
| 1990 | we fill count bytes backwards from toaddr. This is still ok - we |
| 1991 | end up overwriting the bytes we would have deleted. We just need |
| 1992 | to remember we didn't delete anything i.e. don't set did_shrink, |
| 1993 | so that we don't corrupt reloc offsets or symbol values.*/ |
| 1994 | memset (contents + toaddr - count, fill, count); |
| 1995 | did_pad = TRUE; |
| 1996 | } |
| 1997 | |
| 1998 | if (!did_shrink) |
| 1999 | return TRUE; |
| 2000 | |
| 2001 | /* Adjust all the reloc addresses. */ |
| 2002 | for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++) |
| 2003 | { |
| 2004 | bfd_vma old_reloc_address; |
| 2005 | |
| 2006 | old_reloc_address = (sec->output_section->vma |
| 2007 | + sec->output_offset + irel->r_offset); |
| 2008 | |
| 2009 | /* Get the new reloc address. */ |
| 2010 | if ((irel->r_offset > addr |
| 2011 | && irel->r_offset < toaddr)) |
| 2012 | { |
| 2013 | if (debug_relax) |
| 2014 | printf ("Relocation at address 0x%x needs to be moved.\n" |
| 2015 | "Old section offset: 0x%x, New section offset: 0x%x \n", |
| 2016 | (unsigned int) old_reloc_address, |
| 2017 | (unsigned int) irel->r_offset, |
| 2018 | (unsigned int) ((irel->r_offset) - count)); |
| 2019 | |
| 2020 | irel->r_offset -= count; |
| 2021 | } |
| 2022 | |
| 2023 | } |
| 2024 | |
| 2025 | /* The reloc's own addresses are now ok. However, we need to readjust |
| 2026 | the reloc's addend, i.e. the reloc's value if two conditions are met: |
| 2027 | 1.) the reloc is relative to a symbol in this section that |
| 2028 | is located in front of the shrinked instruction |
| 2029 | 2.) symbol plus addend end up behind the shrinked instruction. |
| 2030 | |
| 2031 | The most common case where this happens are relocs relative to |
| 2032 | the section-start symbol. |
| 2033 | |
| 2034 | This step needs to be done for all of the sections of the bfd. */ |
| 2035 | |
| 2036 | { |
| 2037 | struct bfd_section *isec; |
| 2038 | |
| 2039 | for (isec = abfd->sections; isec; isec = isec->next) |
| 2040 | { |
| 2041 | bfd_vma symval; |
| 2042 | bfd_vma shrinked_insn_address; |
| 2043 | |
| 2044 | if (isec->reloc_count == 0) |
| 2045 | continue; |
| 2046 | |
| 2047 | shrinked_insn_address = (sec->output_section->vma |
| 2048 | + sec->output_offset + addr); |
| 2049 | if (delete_shrinks_insn) |
| 2050 | shrinked_insn_address -= count; |
| 2051 | |
| 2052 | irel = elf_section_data (isec)->relocs; |
| 2053 | /* PR 12161: Read in the relocs for this section if necessary. */ |
| 2054 | if (irel == NULL) |
| 2055 | irel = _bfd_elf_link_read_relocs (abfd, isec, NULL, NULL, TRUE); |
| 2056 | |
| 2057 | for (irelend = irel + isec->reloc_count; |
| 2058 | irel < irelend; |
| 2059 | irel++) |
| 2060 | { |
| 2061 | /* Read this BFD's local symbols if we haven't done |
| 2062 | so already. */ |
| 2063 | if (isymbuf == NULL && symtab_hdr->sh_info != 0) |
| 2064 | { |
| 2065 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 2066 | if (isymbuf == NULL) |
| 2067 | isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, |
| 2068 | symtab_hdr->sh_info, 0, |
| 2069 | NULL, NULL, NULL); |
| 2070 | if (isymbuf == NULL) |
| 2071 | return FALSE; |
| 2072 | } |
| 2073 | |
| 2074 | /* Get the value of the symbol referred to by the reloc. */ |
| 2075 | if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) |
| 2076 | { |
| 2077 | /* A local symbol. */ |
| 2078 | asection *sym_sec; |
| 2079 | |
| 2080 | isym = isymbuf + ELF32_R_SYM (irel->r_info); |
| 2081 | sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| 2082 | symval = isym->st_value; |
| 2083 | /* If the reloc is absolute, it will not have |
| 2084 | a symbol or section associated with it. */ |
| 2085 | if (sym_sec == sec) |
| 2086 | { |
| 2087 | /* If there is an alignment boundary, we only need to |
| 2088 | adjust addends that end up below the boundary. */ |
| 2089 | bfd_vma shrink_boundary = (toaddr |
| 2090 | + sec->output_section->vma |
| 2091 | + sec->output_offset); |
| 2092 | |
| 2093 | symval += sym_sec->output_section->vma |
| 2094 | + sym_sec->output_offset; |
| 2095 | |
| 2096 | if (debug_relax) |
| 2097 | printf ("Checking if the relocation's " |
| 2098 | "addend needs corrections.\n" |
| 2099 | "Address of anchor symbol: 0x%x \n" |
| 2100 | "Address of relocation target: 0x%x \n" |
| 2101 | "Address of relaxed insn: 0x%x \n", |
| 2102 | (unsigned int) symval, |
| 2103 | (unsigned int) (symval + irel->r_addend), |
| 2104 | (unsigned int) shrinked_insn_address); |
| 2105 | |
| 2106 | elf32_avr_adjust_reloc_if_spans_insn (abfd, isec, irel, |
| 2107 | symval, |
| 2108 | shrinked_insn_address, |
| 2109 | shrink_boundary, |
| 2110 | count); |
| 2111 | } |
| 2112 | /* else...Reference symbol is absolute. No adjustment needed. */ |
| 2113 | } |
| 2114 | /* else...Reference symbol is extern. No need for adjusting |
| 2115 | the addend. */ |
| 2116 | } |
| 2117 | } |
| 2118 | } |
| 2119 | |
| 2120 | /* Adjust the local symbols defined in this section. */ |
| 2121 | isym = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 2122 | /* Fix PR 9841, there may be no local symbols. */ |
| 2123 | if (isym != NULL) |
| 2124 | { |
| 2125 | Elf_Internal_Sym *isymend; |
| 2126 | |
| 2127 | isymend = isym + symtab_hdr->sh_info; |
| 2128 | for (; isym < isymend; isym++) |
| 2129 | { |
| 2130 | if (isym->st_shndx == sec_shndx) |
| 2131 | { |
| 2132 | symvalue symval = isym->st_value; |
| 2133 | symvalue symend = symval + isym->st_size; |
| 2134 | if (avr_should_reduce_sym_size (symval, symend, |
| 2135 | addr, toaddr, did_pad)) |
| 2136 | { |
| 2137 | /* If this assert fires then we have a symbol that ends |
| 2138 | part way through an instruction. Does that make |
| 2139 | sense? */ |
| 2140 | BFD_ASSERT (isym->st_value + isym->st_size >= addr + count); |
| 2141 | isym->st_size -= count; |
| 2142 | } |
| 2143 | else if (avr_should_increase_sym_size (symval, symend, |
| 2144 | addr, toaddr, did_pad)) |
| 2145 | isym->st_size += count; |
| 2146 | |
| 2147 | if (avr_should_move_sym (symval, addr, toaddr, did_pad)) |
| 2148 | isym->st_value -= count; |
| 2149 | } |
| 2150 | } |
| 2151 | } |
| 2152 | |
| 2153 | /* Now adjust the global symbols defined in this section. */ |
| 2154 | symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) |
| 2155 | - symtab_hdr->sh_info); |
| 2156 | sym_hashes = elf_sym_hashes (abfd); |
| 2157 | end_hashes = sym_hashes + symcount; |
| 2158 | for (; sym_hashes < end_hashes; sym_hashes++) |
| 2159 | { |
| 2160 | struct elf_link_hash_entry *sym_hash = *sym_hashes; |
| 2161 | if ((sym_hash->root.type == bfd_link_hash_defined |
| 2162 | || sym_hash->root.type == bfd_link_hash_defweak) |
| 2163 | && sym_hash->root.u.def.section == sec) |
| 2164 | { |
| 2165 | symvalue symval = sym_hash->root.u.def.value; |
| 2166 | symvalue symend = symval + sym_hash->size; |
| 2167 | |
| 2168 | if (avr_should_reduce_sym_size (symval, symend, |
| 2169 | addr, toaddr, did_pad)) |
| 2170 | { |
| 2171 | /* If this assert fires then we have a symbol that ends |
| 2172 | part way through an instruction. Does that make |
| 2173 | sense? */ |
| 2174 | BFD_ASSERT (symend >= addr + count); |
| 2175 | sym_hash->size -= count; |
| 2176 | } |
| 2177 | else if (avr_should_increase_sym_size (symval, symend, |
| 2178 | addr, toaddr, did_pad)) |
| 2179 | sym_hash->size += count; |
| 2180 | |
| 2181 | if (avr_should_move_sym (symval, addr, toaddr, did_pad)) |
| 2182 | sym_hash->root.u.def.value -= count; |
| 2183 | } |
| 2184 | } |
| 2185 | |
| 2186 | return TRUE; |
| 2187 | } |
| 2188 | |
| 2189 | static Elf_Internal_Sym * |
| 2190 | retrieve_local_syms (bfd *input_bfd) |
| 2191 | { |
| 2192 | Elf_Internal_Shdr *symtab_hdr; |
| 2193 | Elf_Internal_Sym *isymbuf; |
| 2194 | size_t locsymcount; |
| 2195 | |
| 2196 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 2197 | locsymcount = symtab_hdr->sh_info; |
| 2198 | |
| 2199 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 2200 | if (isymbuf == NULL && locsymcount != 0) |
| 2201 | isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0, |
| 2202 | NULL, NULL, NULL); |
| 2203 | |
| 2204 | /* Save the symbols for this input file so they won't be read again. */ |
| 2205 | if (isymbuf && isymbuf != (Elf_Internal_Sym *) symtab_hdr->contents) |
| 2206 | symtab_hdr->contents = (unsigned char *) isymbuf; |
| 2207 | |
| 2208 | return isymbuf; |
| 2209 | } |
| 2210 | |
| 2211 | /* Get the input section for a given symbol index. |
| 2212 | If the symbol is: |
| 2213 | . a section symbol, return the section; |
| 2214 | . a common symbol, return the common section; |
| 2215 | . an undefined symbol, return the undefined section; |
| 2216 | . an indirect symbol, follow the links; |
| 2217 | . an absolute value, return the absolute section. */ |
| 2218 | |
| 2219 | static asection * |
| 2220 | get_elf_r_symndx_section (bfd *abfd, unsigned long r_symndx) |
| 2221 | { |
| 2222 | Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 2223 | asection *target_sec = NULL; |
| 2224 | if (r_symndx < symtab_hdr->sh_info) |
| 2225 | { |
| 2226 | Elf_Internal_Sym *isymbuf; |
| 2227 | unsigned int section_index; |
| 2228 | |
| 2229 | isymbuf = retrieve_local_syms (abfd); |
| 2230 | section_index = isymbuf[r_symndx].st_shndx; |
| 2231 | |
| 2232 | if (section_index == SHN_UNDEF) |
| 2233 | target_sec = bfd_und_section_ptr; |
| 2234 | else if (section_index == SHN_ABS) |
| 2235 | target_sec = bfd_abs_section_ptr; |
| 2236 | else if (section_index == SHN_COMMON) |
| 2237 | target_sec = bfd_com_section_ptr; |
| 2238 | else |
| 2239 | target_sec = bfd_section_from_elf_index (abfd, section_index); |
| 2240 | } |
| 2241 | else |
| 2242 | { |
| 2243 | unsigned long indx = r_symndx - symtab_hdr->sh_info; |
| 2244 | struct elf_link_hash_entry *h = elf_sym_hashes (abfd)[indx]; |
| 2245 | |
| 2246 | while (h->root.type == bfd_link_hash_indirect |
| 2247 | || h->root.type == bfd_link_hash_warning) |
| 2248 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 2249 | |
| 2250 | switch (h->root.type) |
| 2251 | { |
| 2252 | case bfd_link_hash_defined: |
| 2253 | case bfd_link_hash_defweak: |
| 2254 | target_sec = h->root.u.def.section; |
| 2255 | break; |
| 2256 | case bfd_link_hash_common: |
| 2257 | target_sec = bfd_com_section_ptr; |
| 2258 | break; |
| 2259 | case bfd_link_hash_undefined: |
| 2260 | case bfd_link_hash_undefweak: |
| 2261 | target_sec = bfd_und_section_ptr; |
| 2262 | break; |
| 2263 | default: /* New indirect warning. */ |
| 2264 | target_sec = bfd_und_section_ptr; |
| 2265 | break; |
| 2266 | } |
| 2267 | } |
| 2268 | return target_sec; |
| 2269 | } |
| 2270 | |
| 2271 | /* Get the section-relative offset for a symbol number. */ |
| 2272 | |
| 2273 | static bfd_vma |
| 2274 | get_elf_r_symndx_offset (bfd *abfd, unsigned long r_symndx) |
| 2275 | { |
| 2276 | Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 2277 | bfd_vma offset = 0; |
| 2278 | |
| 2279 | if (r_symndx < symtab_hdr->sh_info) |
| 2280 | { |
| 2281 | Elf_Internal_Sym *isymbuf; |
| 2282 | isymbuf = retrieve_local_syms (abfd); |
| 2283 | offset = isymbuf[r_symndx].st_value; |
| 2284 | } |
| 2285 | else |
| 2286 | { |
| 2287 | unsigned long indx = r_symndx - symtab_hdr->sh_info; |
| 2288 | struct elf_link_hash_entry *h = |
| 2289 | elf_sym_hashes (abfd)[indx]; |
| 2290 | |
| 2291 | while (h->root.type == bfd_link_hash_indirect |
| 2292 | || h->root.type == bfd_link_hash_warning) |
| 2293 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 2294 | if (h->root.type == bfd_link_hash_defined |
| 2295 | || h->root.type == bfd_link_hash_defweak) |
| 2296 | offset = h->root.u.def.value; |
| 2297 | } |
| 2298 | return offset; |
| 2299 | } |
| 2300 | |
| 2301 | /* Iterate over the property records in R_LIST, and copy each record into |
| 2302 | the list of records within the relaxation information for the section to |
| 2303 | which the record applies. */ |
| 2304 | |
| 2305 | static void |
| 2306 | avr_elf32_assign_records_to_sections (struct avr_property_record_list *r_list) |
| 2307 | { |
| 2308 | unsigned int i; |
| 2309 | |
| 2310 | for (i = 0; i < r_list->record_count; ++i) |
| 2311 | { |
| 2312 | struct avr_relax_info *relax_info; |
| 2313 | |
| 2314 | relax_info = get_avr_relax_info (r_list->records [i].section); |
| 2315 | BFD_ASSERT (relax_info != NULL); |
| 2316 | |
| 2317 | if (relax_info->records.count |
| 2318 | == relax_info->records.allocated) |
| 2319 | { |
| 2320 | /* Allocate more space. */ |
| 2321 | bfd_size_type size; |
| 2322 | |
| 2323 | relax_info->records.allocated += 10; |
| 2324 | size = (sizeof (struct avr_property_record) |
| 2325 | * relax_info->records.allocated); |
| 2326 | relax_info->records.items |
| 2327 | = bfd_realloc (relax_info->records.items, size); |
| 2328 | } |
| 2329 | |
| 2330 | memcpy (&relax_info->records.items [relax_info->records.count], |
| 2331 | &r_list->records [i], |
| 2332 | sizeof (struct avr_property_record)); |
| 2333 | relax_info->records.count++; |
| 2334 | } |
| 2335 | } |
| 2336 | |
| 2337 | /* Compare two STRUCT AVR_PROPERTY_RECORD in AP and BP, used as the |
| 2338 | ordering callback from QSORT. */ |
| 2339 | |
| 2340 | static int |
| 2341 | avr_property_record_compare (const void *ap, const void *bp) |
| 2342 | { |
| 2343 | const struct avr_property_record *a |
| 2344 | = (struct avr_property_record *) ap; |
| 2345 | const struct avr_property_record *b |
| 2346 | = (struct avr_property_record *) bp; |
| 2347 | |
| 2348 | if (a->offset != b->offset) |
| 2349 | return (a->offset - b->offset); |
| 2350 | |
| 2351 | if (a->section != b->section) |
| 2352 | return (bfd_get_section_vma (a->section->owner, a->section) |
| 2353 | - bfd_get_section_vma (b->section->owner, b->section)); |
| 2354 | |
| 2355 | return (a->type - b->type); |
| 2356 | } |
| 2357 | |
| 2358 | /* Load all of the avr property sections from all of the bfd objects |
| 2359 | referenced from LINK_INFO. All of the records within each property |
| 2360 | section are assigned to the STRUCT AVR_RELAX_INFO within the section |
| 2361 | specific data of the appropriate section. */ |
| 2362 | |
| 2363 | static void |
| 2364 | avr_load_all_property_sections (struct bfd_link_info *link_info) |
| 2365 | { |
| 2366 | bfd *abfd; |
| 2367 | asection *sec; |
| 2368 | |
| 2369 | /* Initialize the per-section relaxation info. */ |
| 2370 | for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link.next) |
| 2371 | for (sec = abfd->sections; sec != NULL; sec = sec->next) |
| 2372 | { |
| 2373 | init_avr_relax_info (sec); |
| 2374 | } |
| 2375 | |
| 2376 | /* Load the descriptor tables from .avr.prop sections. */ |
| 2377 | for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link.next) |
| 2378 | { |
| 2379 | struct avr_property_record_list *r_list; |
| 2380 | |
| 2381 | r_list = avr_elf32_load_property_records (abfd); |
| 2382 | if (r_list != NULL) |
| 2383 | avr_elf32_assign_records_to_sections (r_list); |
| 2384 | |
| 2385 | free (r_list); |
| 2386 | } |
| 2387 | |
| 2388 | /* Now, for every section, ensure that the descriptor list in the |
| 2389 | relaxation data is sorted by ascending offset within the section. */ |
| 2390 | for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link.next) |
| 2391 | for (sec = abfd->sections; sec != NULL; sec = sec->next) |
| 2392 | { |
| 2393 | struct avr_relax_info *relax_info = get_avr_relax_info (sec); |
| 2394 | if (relax_info && relax_info->records.count > 0) |
| 2395 | { |
| 2396 | unsigned int i; |
| 2397 | |
| 2398 | qsort (relax_info->records.items, |
| 2399 | relax_info->records.count, |
| 2400 | sizeof (struct avr_property_record), |
| 2401 | avr_property_record_compare); |
| 2402 | |
| 2403 | /* For debug purposes, list all the descriptors. */ |
| 2404 | for (i = 0; i < relax_info->records.count; ++i) |
| 2405 | { |
| 2406 | switch (relax_info->records.items [i].type) |
| 2407 | { |
| 2408 | case RECORD_ORG: |
| 2409 | break; |
| 2410 | case RECORD_ORG_AND_FILL: |
| 2411 | break; |
| 2412 | case RECORD_ALIGN: |
| 2413 | break; |
| 2414 | case RECORD_ALIGN_AND_FILL: |
| 2415 | break; |
| 2416 | }; |
| 2417 | } |
| 2418 | } |
| 2419 | } |
| 2420 | } |
| 2421 | |
| 2422 | /* This function handles relaxing for the avr. |
| 2423 | Many important relaxing opportunities within functions are already |
| 2424 | realized by the compiler itself. |
| 2425 | Here we try to replace call (4 bytes) -> rcall (2 bytes) |
| 2426 | and jump -> rjmp (safes also 2 bytes). |
| 2427 | As well we now optimize seqences of |
| 2428 | - call/rcall function |
| 2429 | - ret |
| 2430 | to yield |
| 2431 | - jmp/rjmp function |
| 2432 | - ret |
| 2433 | . In case that within a sequence |
| 2434 | - jmp/rjmp label |
| 2435 | - ret |
| 2436 | the ret could no longer be reached it is optimized away. In order |
| 2437 | to check if the ret is no longer needed, it is checked that the ret's address |
| 2438 | is not the target of a branch or jump within the same section, it is checked |
| 2439 | that there is no skip instruction before the jmp/rjmp and that there |
| 2440 | is no local or global label place at the address of the ret. |
| 2441 | |
| 2442 | We refrain from relaxing within sections ".vectors" and |
| 2443 | ".jumptables" in order to maintain the position of the instructions. |
| 2444 | There, however, we substitute jmp/call by a sequence rjmp,nop/rcall,nop |
| 2445 | if possible. (In future one could possibly use the space of the nop |
| 2446 | for the first instruction of the irq service function. |
| 2447 | |
| 2448 | The .jumptables sections is meant to be used for a future tablejump variant |
| 2449 | for the devices with 3-byte program counter where the table itself |
| 2450 | contains 4-byte jump instructions whose relative offset must not |
| 2451 | be changed. */ |
| 2452 | |
| 2453 | static bfd_boolean |
| 2454 | elf32_avr_relax_section (bfd *abfd, |
| 2455 | asection *sec, |
| 2456 | struct bfd_link_info *link_info, |
| 2457 | bfd_boolean *again) |
| 2458 | { |
| 2459 | Elf_Internal_Shdr *symtab_hdr; |
| 2460 | Elf_Internal_Rela *internal_relocs; |
| 2461 | Elf_Internal_Rela *irel, *irelend; |
| 2462 | bfd_byte *contents = NULL; |
| 2463 | Elf_Internal_Sym *isymbuf = NULL; |
| 2464 | struct elf32_avr_link_hash_table *htab; |
| 2465 | static bfd_boolean relaxation_initialised = FALSE; |
| 2466 | |
| 2467 | if (!relaxation_initialised) |
| 2468 | { |
| 2469 | relaxation_initialised = TRUE; |
| 2470 | |
| 2471 | /* Load entries from the .avr.prop sections. */ |
| 2472 | avr_load_all_property_sections (link_info); |
| 2473 | } |
| 2474 | |
| 2475 | /* If 'shrinkable' is FALSE, do not shrink by deleting bytes while |
| 2476 | relaxing. Such shrinking can cause issues for the sections such |
| 2477 | as .vectors and .jumptables. Instead the unused bytes should be |
| 2478 | filled with nop instructions. */ |
| 2479 | bfd_boolean shrinkable = TRUE; |
| 2480 | |
| 2481 | if (!strcmp (sec->name,".vectors") |
| 2482 | || !strcmp (sec->name,".jumptables")) |
| 2483 | shrinkable = FALSE; |
| 2484 | |
| 2485 | if (bfd_link_relocatable (link_info)) |
| 2486 | (*link_info->callbacks->einfo) |
| 2487 | (_("%P%F: --relax and -r may not be used together\n")); |
| 2488 | |
| 2489 | htab = avr_link_hash_table (link_info); |
| 2490 | if (htab == NULL) |
| 2491 | return FALSE; |
| 2492 | |
| 2493 | /* Assume nothing changes. */ |
| 2494 | *again = FALSE; |
| 2495 | |
| 2496 | if ((!htab->no_stubs) && (sec == htab->stub_sec)) |
| 2497 | { |
| 2498 | /* We are just relaxing the stub section. |
| 2499 | Let's calculate the size needed again. */ |
| 2500 | bfd_size_type last_estimated_stub_section_size = htab->stub_sec->size; |
| 2501 | |
| 2502 | if (debug_relax) |
| 2503 | printf ("Relaxing the stub section. Size prior to this pass: %i\n", |
| 2504 | (int) last_estimated_stub_section_size); |
| 2505 | |
| 2506 | elf32_avr_size_stubs (htab->stub_sec->output_section->owner, |
| 2507 | link_info, FALSE); |
| 2508 | |
| 2509 | /* Check if the number of trampolines changed. */ |
| 2510 | if (last_estimated_stub_section_size != htab->stub_sec->size) |
| 2511 | *again = TRUE; |
| 2512 | |
| 2513 | if (debug_relax) |
| 2514 | printf ("Size of stub section after this pass: %i\n", |
| 2515 | (int) htab->stub_sec->size); |
| 2516 | |
| 2517 | return TRUE; |
| 2518 | } |
| 2519 | |
| 2520 | /* We don't have to do anything for a relocatable link, if |
| 2521 | this section does not have relocs, or if this is not a |
| 2522 | code section. */ |
| 2523 | if (bfd_link_relocatable (link_info) |
| 2524 | || (sec->flags & SEC_RELOC) == 0 |
| 2525 | || sec->reloc_count == 0 |
| 2526 | || (sec->flags & SEC_CODE) == 0) |
| 2527 | return TRUE; |
| 2528 | |
| 2529 | /* Check if the object file to relax uses internal symbols so that we |
| 2530 | could fix up the relocations. */ |
| 2531 | if (!(elf_elfheader (abfd)->e_flags & EF_AVR_LINKRELAX_PREPARED)) |
| 2532 | return TRUE; |
| 2533 | |
| 2534 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 2535 | |
| 2536 | /* Get a copy of the native relocations. */ |
| 2537 | internal_relocs = (_bfd_elf_link_read_relocs |
| 2538 | (abfd, sec, NULL, NULL, link_info->keep_memory)); |
| 2539 | if (internal_relocs == NULL) |
| 2540 | goto error_return; |
| 2541 | |
| 2542 | /* Walk through the relocs looking for relaxing opportunities. */ |
| 2543 | irelend = internal_relocs + sec->reloc_count; |
| 2544 | for (irel = internal_relocs; irel < irelend; irel++) |
| 2545 | { |
| 2546 | bfd_vma symval; |
| 2547 | |
| 2548 | if ( ELF32_R_TYPE (irel->r_info) != R_AVR_13_PCREL |
| 2549 | && ELF32_R_TYPE (irel->r_info) != R_AVR_7_PCREL |
| 2550 | && ELF32_R_TYPE (irel->r_info) != R_AVR_CALL) |
| 2551 | continue; |
| 2552 | |
| 2553 | /* Get the section contents if we haven't done so already. */ |
| 2554 | if (contents == NULL) |
| 2555 | { |
| 2556 | /* Get cached copy if it exists. */ |
| 2557 | if (elf_section_data (sec)->this_hdr.contents != NULL) |
| 2558 | contents = elf_section_data (sec)->this_hdr.contents; |
| 2559 | else |
| 2560 | { |
| 2561 | /* Go get them off disk. */ |
| 2562 | if (! bfd_malloc_and_get_section (abfd, sec, &contents)) |
| 2563 | goto error_return; |
| 2564 | } |
| 2565 | } |
| 2566 | |
| 2567 | /* Read this BFD's local symbols if we haven't done so already. */ |
| 2568 | if (isymbuf == NULL && symtab_hdr->sh_info != 0) |
| 2569 | { |
| 2570 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 2571 | if (isymbuf == NULL) |
| 2572 | isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, |
| 2573 | symtab_hdr->sh_info, 0, |
| 2574 | NULL, NULL, NULL); |
| 2575 | if (isymbuf == NULL) |
| 2576 | goto error_return; |
| 2577 | } |
| 2578 | |
| 2579 | |
| 2580 | /* Get the value of the symbol referred to by the reloc. */ |
| 2581 | if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) |
| 2582 | { |
| 2583 | /* A local symbol. */ |
| 2584 | Elf_Internal_Sym *isym; |
| 2585 | asection *sym_sec; |
| 2586 | |
| 2587 | isym = isymbuf + ELF32_R_SYM (irel->r_info); |
| 2588 | sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| 2589 | symval = isym->st_value; |
| 2590 | /* If the reloc is absolute, it will not have |
| 2591 | a symbol or section associated with it. */ |
| 2592 | if (sym_sec) |
| 2593 | symval += sym_sec->output_section->vma |
| 2594 | + sym_sec->output_offset; |
| 2595 | } |
| 2596 | else |
| 2597 | { |
| 2598 | unsigned long indx; |
| 2599 | struct elf_link_hash_entry *h; |
| 2600 | |
| 2601 | /* An external symbol. */ |
| 2602 | indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; |
| 2603 | h = elf_sym_hashes (abfd)[indx]; |
| 2604 | BFD_ASSERT (h != NULL); |
| 2605 | if (h->root.type != bfd_link_hash_defined |
| 2606 | && h->root.type != bfd_link_hash_defweak) |
| 2607 | /* This appears to be a reference to an undefined |
| 2608 | symbol. Just ignore it--it will be caught by the |
| 2609 | regular reloc processing. */ |
| 2610 | continue; |
| 2611 | |
| 2612 | symval = (h->root.u.def.value |
| 2613 | + h->root.u.def.section->output_section->vma |
| 2614 | + h->root.u.def.section->output_offset); |
| 2615 | } |
| 2616 | |
| 2617 | /* For simplicity of coding, we are going to modify the section |
| 2618 | contents, the section relocs, and the BFD symbol table. We |
| 2619 | must tell the rest of the code not to free up this |
| 2620 | information. It would be possible to instead create a table |
| 2621 | of changes which have to be made, as is done in coff-mips.c; |
| 2622 | that would be more work, but would require less memory when |
| 2623 | the linker is run. */ |
| 2624 | switch (ELF32_R_TYPE (irel->r_info)) |
| 2625 | { |
| 2626 | /* Try to turn a 22-bit absolute call/jump into an 13-bit |
| 2627 | pc-relative rcall/rjmp. */ |
| 2628 | case R_AVR_CALL: |
| 2629 | { |
| 2630 | bfd_vma value = symval + irel->r_addend; |
| 2631 | bfd_vma dot, gap; |
| 2632 | int distance_short_enough = 0; |
| 2633 | |
| 2634 | /* Get the address of this instruction. */ |
| 2635 | dot = (sec->output_section->vma |
| 2636 | + sec->output_offset + irel->r_offset); |
| 2637 | |
| 2638 | /* Compute the distance from this insn to the branch target. */ |
| 2639 | gap = value - dot; |
| 2640 | |
| 2641 | /* Check if the gap falls in the range that can be accommodated |
| 2642 | in 13bits signed (It is 12bits when encoded, as we deal with |
| 2643 | word addressing). */ |
| 2644 | if (!shrinkable && ((int) gap >= -4096 && (int) gap <= 4095)) |
| 2645 | distance_short_enough = 1; |
| 2646 | /* If shrinkable, then we can check for a range of distance which |
| 2647 | is two bytes farther on both the directions because the call |
| 2648 | or jump target will be closer by two bytes after the |
| 2649 | relaxation. */ |
| 2650 | else if (shrinkable && ((int) gap >= -4094 && (int) gap <= 4097)) |
| 2651 | distance_short_enough = 1; |
| 2652 | |
| 2653 | /* Here we handle the wrap-around case. E.g. for a 16k device |
| 2654 | we could use a rjmp to jump from address 0x100 to 0x3d00! |
| 2655 | In order to make this work properly, we need to fill the |
| 2656 | vaiable avr_pc_wrap_around with the appropriate value. |
| 2657 | I.e. 0x4000 for a 16k device. */ |
| 2658 | { |
| 2659 | /* Shrinking the code size makes the gaps larger in the |
| 2660 | case of wrap-arounds. So we use a heuristical safety |
| 2661 | margin to avoid that during relax the distance gets |
| 2662 | again too large for the short jumps. Let's assume |
| 2663 | a typical code-size reduction due to relax for a |
| 2664 | 16k device of 600 bytes. So let's use twice the |
| 2665 | typical value as safety margin. */ |
| 2666 | int rgap; |
| 2667 | int safety_margin; |
| 2668 | |
| 2669 | int assumed_shrink = 600; |
| 2670 | if (avr_pc_wrap_around > 0x4000) |
| 2671 | assumed_shrink = 900; |
| 2672 | |
| 2673 | safety_margin = 2 * assumed_shrink; |
| 2674 | |
| 2675 | rgap = avr_relative_distance_considering_wrap_around (gap); |
| 2676 | |
| 2677 | if (rgap >= (-4092 + safety_margin) |
| 2678 | && rgap <= (4094 - safety_margin)) |
| 2679 | distance_short_enough = 1; |
| 2680 | } |
| 2681 | |
| 2682 | if (distance_short_enough) |
| 2683 | { |
| 2684 | unsigned char code_msb; |
| 2685 | unsigned char code_lsb; |
| 2686 | |
| 2687 | if (debug_relax) |
| 2688 | printf ("shrinking jump/call instruction at address 0x%x" |
| 2689 | " in section %s\n\n", |
| 2690 | (int) dot, sec->name); |
| 2691 | |
| 2692 | /* Note that we've changed the relocs, section contents, |
| 2693 | etc. */ |
| 2694 | elf_section_data (sec)->relocs = internal_relocs; |
| 2695 | elf_section_data (sec)->this_hdr.contents = contents; |
| 2696 | symtab_hdr->contents = (unsigned char *) isymbuf; |
| 2697 | |
| 2698 | /* Get the instruction code for relaxing. */ |
| 2699 | code_lsb = bfd_get_8 (abfd, contents + irel->r_offset); |
| 2700 | code_msb = bfd_get_8 (abfd, contents + irel->r_offset + 1); |
| 2701 | |
| 2702 | /* Mask out the relocation bits. */ |
| 2703 | code_msb &= 0x94; |
| 2704 | code_lsb &= 0x0E; |
| 2705 | if (code_msb == 0x94 && code_lsb == 0x0E) |
| 2706 | { |
| 2707 | /* we are changing call -> rcall . */ |
| 2708 | bfd_put_8 (abfd, 0x00, contents + irel->r_offset); |
| 2709 | bfd_put_8 (abfd, 0xD0, contents + irel->r_offset + 1); |
| 2710 | } |
| 2711 | else if (code_msb == 0x94 && code_lsb == 0x0C) |
| 2712 | { |
| 2713 | /* we are changeing jump -> rjmp. */ |
| 2714 | bfd_put_8 (abfd, 0x00, contents + irel->r_offset); |
| 2715 | bfd_put_8 (abfd, 0xC0, contents + irel->r_offset + 1); |
| 2716 | } |
| 2717 | else |
| 2718 | abort (); |
| 2719 | |
| 2720 | /* Fix the relocation's type. */ |
| 2721 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| 2722 | R_AVR_13_PCREL); |
| 2723 | |
| 2724 | /* We should not modify the ordering if 'shrinkable' is |
| 2725 | FALSE. */ |
| 2726 | if (!shrinkable) |
| 2727 | { |
| 2728 | /* Let's insert a nop. */ |
| 2729 | bfd_put_8 (abfd, 0x00, contents + irel->r_offset + 2); |
| 2730 | bfd_put_8 (abfd, 0x00, contents + irel->r_offset + 3); |
| 2731 | } |
| 2732 | else |
| 2733 | { |
| 2734 | /* Delete two bytes of data. */ |
| 2735 | if (!elf32_avr_relax_delete_bytes (abfd, sec, |
| 2736 | irel->r_offset + 2, 2, |
| 2737 | TRUE)) |
| 2738 | goto error_return; |
| 2739 | |
| 2740 | /* That will change things, so, we should relax again. |
| 2741 | Note that this is not required, and it may be slow. */ |
| 2742 | *again = TRUE; |
| 2743 | } |
| 2744 | } |
| 2745 | } |
| 2746 | /* Fall through. */ |
| 2747 | |
| 2748 | default: |
| 2749 | { |
| 2750 | unsigned char code_msb; |
| 2751 | unsigned char code_lsb; |
| 2752 | bfd_vma dot; |
| 2753 | |
| 2754 | code_msb = bfd_get_8 (abfd, contents + irel->r_offset + 1); |
| 2755 | code_lsb = bfd_get_8 (abfd, contents + irel->r_offset + 0); |
| 2756 | |
| 2757 | /* Get the address of this instruction. */ |
| 2758 | dot = (sec->output_section->vma |
| 2759 | + sec->output_offset + irel->r_offset); |
| 2760 | |
| 2761 | /* Here we look for rcall/ret or call/ret sequences that could be |
| 2762 | safely replaced by rjmp/ret or jmp/ret. */ |
| 2763 | if (((code_msb & 0xf0) == 0xd0) |
| 2764 | && avr_replace_call_ret_sequences) |
| 2765 | { |
| 2766 | /* This insn is a rcall. */ |
| 2767 | unsigned char next_insn_msb = 0; |
| 2768 | unsigned char next_insn_lsb = 0; |
| 2769 | |
| 2770 | if (irel->r_offset + 3 < sec->size) |
| 2771 | { |
| 2772 | next_insn_msb = |
| 2773 | bfd_get_8 (abfd, contents + irel->r_offset + 3); |
| 2774 | next_insn_lsb = |
| 2775 | bfd_get_8 (abfd, contents + irel->r_offset + 2); |
| 2776 | } |
| 2777 | |
| 2778 | if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb)) |
| 2779 | { |
| 2780 | /* The next insn is a ret. We now convert the rcall insn |
| 2781 | into a rjmp instruction. */ |
| 2782 | code_msb &= 0xef; |
| 2783 | bfd_put_8 (abfd, code_msb, contents + irel->r_offset + 1); |
| 2784 | if (debug_relax) |
| 2785 | printf ("converted rcall/ret sequence at address 0x%x" |
| 2786 | " into rjmp/ret sequence. Section is %s\n\n", |
| 2787 | (int) dot, sec->name); |
| 2788 | *again = TRUE; |
| 2789 | break; |
| 2790 | } |
| 2791 | } |
| 2792 | else if ((0x94 == (code_msb & 0xfe)) |
| 2793 | && (0x0e == (code_lsb & 0x0e)) |
| 2794 | && avr_replace_call_ret_sequences) |
| 2795 | { |
| 2796 | /* This insn is a call. */ |
| 2797 | unsigned char next_insn_msb = 0; |
| 2798 | unsigned char next_insn_lsb = 0; |
| 2799 | |
| 2800 | if (irel->r_offset + 5 < sec->size) |
| 2801 | { |
| 2802 | next_insn_msb = |
| 2803 | bfd_get_8 (abfd, contents + irel->r_offset + 5); |
| 2804 | next_insn_lsb = |
| 2805 | bfd_get_8 (abfd, contents + irel->r_offset + 4); |
| 2806 | } |
| 2807 | |
| 2808 | if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb)) |
| 2809 | { |
| 2810 | /* The next insn is a ret. We now convert the call insn |
| 2811 | into a jmp instruction. */ |
| 2812 | |
| 2813 | code_lsb &= 0xfd; |
| 2814 | bfd_put_8 (abfd, code_lsb, contents + irel->r_offset); |
| 2815 | if (debug_relax) |
| 2816 | printf ("converted call/ret sequence at address 0x%x" |
| 2817 | " into jmp/ret sequence. Section is %s\n\n", |
| 2818 | (int) dot, sec->name); |
| 2819 | *again = TRUE; |
| 2820 | break; |
| 2821 | } |
| 2822 | } |
| 2823 | else if ((0xc0 == (code_msb & 0xf0)) |
| 2824 | || ((0x94 == (code_msb & 0xfe)) |
| 2825 | && (0x0c == (code_lsb & 0x0e)))) |
| 2826 | { |
| 2827 | /* This insn is a rjmp or a jmp. */ |
| 2828 | unsigned char next_insn_msb = 0; |
| 2829 | unsigned char next_insn_lsb = 0; |
| 2830 | int insn_size; |
| 2831 | |
| 2832 | if (0xc0 == (code_msb & 0xf0)) |
| 2833 | insn_size = 2; /* rjmp insn */ |
| 2834 | else |
| 2835 | insn_size = 4; /* jmp insn */ |
| 2836 | |
| 2837 | if (irel->r_offset + insn_size + 1 < sec->size) |
| 2838 | { |
| 2839 | next_insn_msb = |
| 2840 | bfd_get_8 (abfd, contents + irel->r_offset |
| 2841 | + insn_size + 1); |
| 2842 | next_insn_lsb = |
| 2843 | bfd_get_8 (abfd, contents + irel->r_offset |
| 2844 | + insn_size); |
| 2845 | } |
| 2846 | |
| 2847 | if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb)) |
| 2848 | { |
| 2849 | /* The next insn is a ret. We possibly could delete |
| 2850 | this ret. First we need to check for preceding |
| 2851 | sbis/sbic/sbrs or cpse "skip" instructions. */ |
| 2852 | |
| 2853 | int there_is_preceding_non_skip_insn = 1; |
| 2854 | bfd_vma address_of_ret; |
| 2855 | |
| 2856 | address_of_ret = dot + insn_size; |
| 2857 | |
| 2858 | if (debug_relax && (insn_size == 2)) |
| 2859 | printf ("found rjmp / ret sequence at address 0x%x\n", |
| 2860 | (int) dot); |
| 2861 | if (debug_relax && (insn_size == 4)) |
| 2862 | printf ("found jmp / ret sequence at address 0x%x\n", |
| 2863 | (int) dot); |
| 2864 | |
| 2865 | /* We have to make sure that there is a preceding insn. */ |
| 2866 | if (irel->r_offset >= 2) |
| 2867 | { |
| 2868 | unsigned char preceding_msb; |
| 2869 | unsigned char preceding_lsb; |
| 2870 | |
| 2871 | preceding_msb = |
| 2872 | bfd_get_8 (abfd, contents + irel->r_offset - 1); |
| 2873 | preceding_lsb = |
| 2874 | bfd_get_8 (abfd, contents + irel->r_offset - 2); |
| 2875 | |
| 2876 | /* sbic. */ |
| 2877 | if (0x99 == preceding_msb) |
| 2878 | there_is_preceding_non_skip_insn = 0; |
| 2879 | |
| 2880 | /* sbis. */ |
| 2881 | if (0x9b == preceding_msb) |
| 2882 | there_is_preceding_non_skip_insn = 0; |
| 2883 | |
| 2884 | /* sbrc */ |
| 2885 | if ((0xfc == (preceding_msb & 0xfe) |
| 2886 | && (0x00 == (preceding_lsb & 0x08)))) |
| 2887 | there_is_preceding_non_skip_insn = 0; |
| 2888 | |
| 2889 | /* sbrs */ |
| 2890 | if ((0xfe == (preceding_msb & 0xfe) |
| 2891 | && (0x00 == (preceding_lsb & 0x08)))) |
| 2892 | there_is_preceding_non_skip_insn = 0; |
| 2893 | |
| 2894 | /* cpse */ |
| 2895 | if (0x10 == (preceding_msb & 0xfc)) |
| 2896 | there_is_preceding_non_skip_insn = 0; |
| 2897 | |
| 2898 | if (there_is_preceding_non_skip_insn == 0) |
| 2899 | if (debug_relax) |
| 2900 | printf ("preceding skip insn prevents deletion of" |
| 2901 | " ret insn at Addy 0x%x in section %s\n", |
| 2902 | (int) dot + 2, sec->name); |
| 2903 | } |
| 2904 | else |
| 2905 | { |
| 2906 | /* There is no previous instruction. */ |
| 2907 | there_is_preceding_non_skip_insn = 0; |
| 2908 | } |
| 2909 | |
| 2910 | if (there_is_preceding_non_skip_insn) |
| 2911 | { |
| 2912 | /* We now only have to make sure that there is no |
| 2913 | local label defined at the address of the ret |
| 2914 | instruction and that there is no local relocation |
| 2915 | in this section pointing to the ret. */ |
| 2916 | |
| 2917 | int deleting_ret_is_safe = 1; |
| 2918 | unsigned int section_offset_of_ret_insn = |
| 2919 | irel->r_offset + insn_size; |
| 2920 | Elf_Internal_Sym *isym, *isymend; |
| 2921 | unsigned int sec_shndx; |
| 2922 | struct bfd_section *isec; |
| 2923 | |
| 2924 | sec_shndx = |
| 2925 | _bfd_elf_section_from_bfd_section (abfd, sec); |
| 2926 | |
| 2927 | /* Check for local symbols. */ |
| 2928 | isym = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 2929 | isymend = isym + symtab_hdr->sh_info; |
| 2930 | /* PR 6019: There may not be any local symbols. */ |
| 2931 | for (; isym != NULL && isym < isymend; isym++) |
| 2932 | { |
| 2933 | if (isym->st_value == section_offset_of_ret_insn |
| 2934 | && isym->st_shndx == sec_shndx) |
| 2935 | { |
| 2936 | deleting_ret_is_safe = 0; |
| 2937 | if (debug_relax) |
| 2938 | printf ("local label prevents deletion of ret " |
| 2939 | "insn at address 0x%x\n", |
| 2940 | (int) dot + insn_size); |
| 2941 | } |
| 2942 | } |
| 2943 | |
| 2944 | /* Now check for global symbols. */ |
| 2945 | { |
| 2946 | int symcount; |
| 2947 | struct elf_link_hash_entry **sym_hashes; |
| 2948 | struct elf_link_hash_entry **end_hashes; |
| 2949 | |
| 2950 | symcount = (symtab_hdr->sh_size |
| 2951 | / sizeof (Elf32_External_Sym) |
| 2952 | - symtab_hdr->sh_info); |
| 2953 | sym_hashes = elf_sym_hashes (abfd); |
| 2954 | end_hashes = sym_hashes + symcount; |
| 2955 | for (; sym_hashes < end_hashes; sym_hashes++) |
| 2956 | { |
| 2957 | struct elf_link_hash_entry *sym_hash = |
| 2958 | *sym_hashes; |
| 2959 | if ((sym_hash->root.type == bfd_link_hash_defined |
| 2960 | || sym_hash->root.type == |
| 2961 | bfd_link_hash_defweak) |
| 2962 | && sym_hash->root.u.def.section == sec |
| 2963 | && sym_hash->root.u.def.value == section_offset_of_ret_insn) |
| 2964 | { |
| 2965 | deleting_ret_is_safe = 0; |
| 2966 | if (debug_relax) |
| 2967 | printf ("global label prevents deletion of " |
| 2968 | "ret insn at address 0x%x\n", |
| 2969 | (int) dot + insn_size); |
| 2970 | } |
| 2971 | } |
| 2972 | } |
| 2973 | |
| 2974 | /* Now we check for relocations pointing to ret. */ |
| 2975 | for (isec = abfd->sections; isec && deleting_ret_is_safe; isec = isec->next) |
| 2976 | { |
| 2977 | Elf_Internal_Rela *rel; |
| 2978 | Elf_Internal_Rela *relend; |
| 2979 | |
| 2980 | rel = elf_section_data (isec)->relocs; |
| 2981 | if (rel == NULL) |
| 2982 | rel = _bfd_elf_link_read_relocs (abfd, isec, NULL, NULL, TRUE); |
| 2983 | |
| 2984 | relend = rel + isec->reloc_count; |
| 2985 | |
| 2986 | for (; rel && rel < relend; rel++) |
| 2987 | { |
| 2988 | bfd_vma reloc_target = 0; |
| 2989 | |
| 2990 | /* Read this BFD's local symbols if we haven't |
| 2991 | done so already. */ |
| 2992 | if (isymbuf == NULL && symtab_hdr->sh_info != 0) |
| 2993 | { |
| 2994 | isymbuf = (Elf_Internal_Sym *) |
| 2995 | symtab_hdr->contents; |
| 2996 | if (isymbuf == NULL) |
| 2997 | isymbuf = bfd_elf_get_elf_syms |
| 2998 | (abfd, |
| 2999 | symtab_hdr, |
| 3000 | symtab_hdr->sh_info, 0, |
| 3001 | NULL, NULL, NULL); |
| 3002 | if (isymbuf == NULL) |
| 3003 | break; |
| 3004 | } |
| 3005 | |
| 3006 | /* Get the value of the symbol referred to |
| 3007 | by the reloc. */ |
| 3008 | if (ELF32_R_SYM (rel->r_info) |
| 3009 | < symtab_hdr->sh_info) |
| 3010 | { |
| 3011 | /* A local symbol. */ |
| 3012 | asection *sym_sec; |
| 3013 | |
| 3014 | isym = isymbuf |
| 3015 | + ELF32_R_SYM (rel->r_info); |
| 3016 | sym_sec = bfd_section_from_elf_index |
| 3017 | (abfd, isym->st_shndx); |
| 3018 | symval = isym->st_value; |
| 3019 | |
| 3020 | /* If the reloc is absolute, it will not |
| 3021 | have a symbol or section associated |
| 3022 | with it. */ |
| 3023 | |
| 3024 | if (sym_sec) |
| 3025 | { |
| 3026 | symval += |
| 3027 | sym_sec->output_section->vma |
| 3028 | + sym_sec->output_offset; |
| 3029 | reloc_target = symval + rel->r_addend; |
| 3030 | } |
| 3031 | else |
| 3032 | { |
| 3033 | reloc_target = symval + rel->r_addend; |
| 3034 | /* Reference symbol is absolute. */ |
| 3035 | } |
| 3036 | } |
| 3037 | /* else ... reference symbol is extern. */ |
| 3038 | |
| 3039 | if (address_of_ret == reloc_target) |
| 3040 | { |
| 3041 | deleting_ret_is_safe = 0; |
| 3042 | if (debug_relax) |
| 3043 | printf ("ret from " |
| 3044 | "rjmp/jmp ret sequence at address" |
| 3045 | " 0x%x could not be deleted. ret" |
| 3046 | " is target of a relocation.\n", |
| 3047 | (int) address_of_ret); |
| 3048 | break; |
| 3049 | } |
| 3050 | } |
| 3051 | } |
| 3052 | |
| 3053 | if (deleting_ret_is_safe) |
| 3054 | { |
| 3055 | if (debug_relax) |
| 3056 | printf ("unreachable ret instruction " |
| 3057 | "at address 0x%x deleted.\n", |
| 3058 | (int) dot + insn_size); |
| 3059 | |
| 3060 | /* Delete two bytes of data. */ |
| 3061 | if (!elf32_avr_relax_delete_bytes (abfd, sec, |
| 3062 | irel->r_offset + insn_size, 2, |
| 3063 | TRUE)) |
| 3064 | goto error_return; |
| 3065 | |
| 3066 | /* That will change things, so, we should relax |
| 3067 | again. Note that this is not required, and it |
| 3068 | may be slow. */ |
| 3069 | *again = TRUE; |
| 3070 | break; |
| 3071 | } |
| 3072 | } |
| 3073 | } |
| 3074 | } |
| 3075 | break; |
| 3076 | } |
| 3077 | } |
| 3078 | } |
| 3079 | |
| 3080 | if (!*again) |
| 3081 | { |
| 3082 | /* Look through all the property records in this section to see if |
| 3083 | there's any alignment records that can be moved. */ |
| 3084 | struct avr_relax_info *relax_info; |
| 3085 | |
| 3086 | relax_info = get_avr_relax_info (sec); |
| 3087 | if (relax_info->records.count > 0) |
| 3088 | { |
| 3089 | unsigned int i; |
| 3090 | |
| 3091 | for (i = 0; i < relax_info->records.count; ++i) |
| 3092 | { |
| 3093 | switch (relax_info->records.items [i].type) |
| 3094 | { |
| 3095 | case RECORD_ORG: |
| 3096 | case RECORD_ORG_AND_FILL: |
| 3097 | break; |
| 3098 | case RECORD_ALIGN: |
| 3099 | case RECORD_ALIGN_AND_FILL: |
| 3100 | { |
| 3101 | struct avr_property_record *record; |
| 3102 | unsigned long bytes_to_align; |
| 3103 | int count = 0; |
| 3104 | |
| 3105 | /* Look for alignment directives that have had enough |
| 3106 | bytes deleted before them, such that the directive |
| 3107 | can be moved backwards and still maintain the |
| 3108 | required alignment. */ |
| 3109 | record = &relax_info->records.items [i]; |
| 3110 | bytes_to_align |
| 3111 | = (unsigned long) (1 << record->data.align.bytes); |
| 3112 | while (record->data.align.preceding_deleted >= |
| 3113 | bytes_to_align) |
| 3114 | { |
| 3115 | record->data.align.preceding_deleted |
| 3116 | -= bytes_to_align; |
| 3117 | count += bytes_to_align; |
| 3118 | } |
| 3119 | |
| 3120 | if (count > 0) |
| 3121 | { |
| 3122 | bfd_vma addr = record->offset; |
| 3123 | |
| 3124 | /* We can delete COUNT bytes and this alignment |
| 3125 | directive will still be correctly aligned. |
| 3126 | First move the alignment directive, then delete |
| 3127 | the bytes. */ |
| 3128 | record->offset -= count; |
| 3129 | elf32_avr_relax_delete_bytes (abfd, sec, |
| 3130 | addr - count, |
| 3131 | count, FALSE); |
| 3132 | *again = TRUE; |
| 3133 | } |
| 3134 | } |
| 3135 | break; |
| 3136 | } |
| 3137 | } |
| 3138 | } |
| 3139 | } |
| 3140 | |
| 3141 | if (contents != NULL |
| 3142 | && elf_section_data (sec)->this_hdr.contents != contents) |
| 3143 | { |
| 3144 | if (! link_info->keep_memory) |
| 3145 | free (contents); |
| 3146 | else |
| 3147 | { |
| 3148 | /* Cache the section contents for elf_link_input_bfd. */ |
| 3149 | elf_section_data (sec)->this_hdr.contents = contents; |
| 3150 | } |
| 3151 | } |
| 3152 | |
| 3153 | if (internal_relocs != NULL |
| 3154 | && elf_section_data (sec)->relocs != internal_relocs) |
| 3155 | free (internal_relocs); |
| 3156 | |
| 3157 | return TRUE; |
| 3158 | |
| 3159 | error_return: |
| 3160 | if (isymbuf != NULL |
| 3161 | && symtab_hdr->contents != (unsigned char *) isymbuf) |
| 3162 | free (isymbuf); |
| 3163 | if (contents != NULL |
| 3164 | && elf_section_data (sec)->this_hdr.contents != contents) |
| 3165 | free (contents); |
| 3166 | if (internal_relocs != NULL |
| 3167 | && elf_section_data (sec)->relocs != internal_relocs) |
| 3168 | free (internal_relocs); |
| 3169 | |
| 3170 | return FALSE; |
| 3171 | } |
| 3172 | |
| 3173 | /* This is a version of bfd_generic_get_relocated_section_contents |
| 3174 | which uses elf32_avr_relocate_section. |
| 3175 | |
| 3176 | For avr it's essentially a cut and paste taken from the H8300 port. |
| 3177 | The author of the relaxation support patch for avr had absolutely no |
| 3178 | clue what is happening here but found out that this part of the code |
| 3179 | seems to be important. */ |
| 3180 | |
| 3181 | static bfd_byte * |
| 3182 | elf32_avr_get_relocated_section_contents (bfd *output_bfd, |
| 3183 | struct bfd_link_info *link_info, |
| 3184 | struct bfd_link_order *link_order, |
| 3185 | bfd_byte *data, |
| 3186 | bfd_boolean relocatable, |
| 3187 | asymbol **symbols) |
| 3188 | { |
| 3189 | Elf_Internal_Shdr *symtab_hdr; |
| 3190 | asection *input_section = link_order->u.indirect.section; |
| 3191 | bfd *input_bfd = input_section->owner; |
| 3192 | asection **sections = NULL; |
| 3193 | Elf_Internal_Rela *internal_relocs = NULL; |
| 3194 | Elf_Internal_Sym *isymbuf = NULL; |
| 3195 | |
| 3196 | /* We only need to handle the case of relaxing, or of having a |
| 3197 | particular set of section contents, specially. */ |
| 3198 | if (relocatable |
| 3199 | || elf_section_data (input_section)->this_hdr.contents == NULL) |
| 3200 | return bfd_generic_get_relocated_section_contents (output_bfd, link_info, |
| 3201 | link_order, data, |
| 3202 | relocatable, |
| 3203 | symbols); |
| 3204 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 3205 | |
| 3206 | memcpy (data, elf_section_data (input_section)->this_hdr.contents, |
| 3207 | (size_t) input_section->size); |
| 3208 | |
| 3209 | if ((input_section->flags & SEC_RELOC) != 0 |
| 3210 | && input_section->reloc_count > 0) |
| 3211 | { |
| 3212 | asection **secpp; |
| 3213 | Elf_Internal_Sym *isym, *isymend; |
| 3214 | bfd_size_type amt; |
| 3215 | |
| 3216 | internal_relocs = (_bfd_elf_link_read_relocs |
| 3217 | (input_bfd, input_section, NULL, NULL, FALSE)); |
| 3218 | if (internal_relocs == NULL) |
| 3219 | goto error_return; |
| 3220 | |
| 3221 | if (symtab_hdr->sh_info != 0) |
| 3222 | { |
| 3223 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 3224 | if (isymbuf == NULL) |
| 3225 | isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, |
| 3226 | symtab_hdr->sh_info, 0, |
| 3227 | NULL, NULL, NULL); |
| 3228 | if (isymbuf == NULL) |
| 3229 | goto error_return; |
| 3230 | } |
| 3231 | |
| 3232 | amt = symtab_hdr->sh_info; |
| 3233 | amt *= sizeof (asection *); |
| 3234 | sections = bfd_malloc (amt); |
| 3235 | if (sections == NULL && amt != 0) |
| 3236 | goto error_return; |
| 3237 | |
| 3238 | isymend = isymbuf + symtab_hdr->sh_info; |
| 3239 | for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp) |
| 3240 | { |
| 3241 | asection *isec; |
| 3242 | |
| 3243 | if (isym->st_shndx == SHN_UNDEF) |
| 3244 | isec = bfd_und_section_ptr; |
| 3245 | else if (isym->st_shndx == SHN_ABS) |
| 3246 | isec = bfd_abs_section_ptr; |
| 3247 | else if (isym->st_shndx == SHN_COMMON) |
| 3248 | isec = bfd_com_section_ptr; |
| 3249 | else |
| 3250 | isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx); |
| 3251 | |
| 3252 | *secpp = isec; |
| 3253 | } |
| 3254 | |
| 3255 | if (! elf32_avr_relocate_section (output_bfd, link_info, input_bfd, |
| 3256 | input_section, data, internal_relocs, |
| 3257 | isymbuf, sections)) |
| 3258 | goto error_return; |
| 3259 | |
| 3260 | if (sections != NULL) |
| 3261 | free (sections); |
| 3262 | if (isymbuf != NULL |
| 3263 | && symtab_hdr->contents != (unsigned char *) isymbuf) |
| 3264 | free (isymbuf); |
| 3265 | if (elf_section_data (input_section)->relocs != internal_relocs) |
| 3266 | free (internal_relocs); |
| 3267 | } |
| 3268 | |
| 3269 | return data; |
| 3270 | |
| 3271 | error_return: |
| 3272 | if (sections != NULL) |
| 3273 | free (sections); |
| 3274 | if (isymbuf != NULL |
| 3275 | && symtab_hdr->contents != (unsigned char *) isymbuf) |
| 3276 | free (isymbuf); |
| 3277 | if (internal_relocs != NULL |
| 3278 | && elf_section_data (input_section)->relocs != internal_relocs) |
| 3279 | free (internal_relocs); |
| 3280 | return NULL; |
| 3281 | } |
| 3282 | |
| 3283 | |
| 3284 | /* Determines the hash entry name for a particular reloc. It consists of |
| 3285 | the identifier of the symbol section and the added reloc addend and |
| 3286 | symbol offset relative to the section the symbol is attached to. */ |
| 3287 | |
| 3288 | static char * |
| 3289 | avr_stub_name (const asection *symbol_section, |
| 3290 | const bfd_vma symbol_offset, |
| 3291 | const Elf_Internal_Rela *rela) |
| 3292 | { |
| 3293 | char *stub_name; |
| 3294 | bfd_size_type len; |
| 3295 | |
| 3296 | len = 8 + 1 + 8 + 1 + 1; |
| 3297 | stub_name = bfd_malloc (len); |
| 3298 | |
| 3299 | sprintf (stub_name, "%08x+%08x", |
| 3300 | symbol_section->id & 0xffffffff, |
| 3301 | (unsigned int) ((rela->r_addend & 0xffffffff) + symbol_offset)); |
| 3302 | |
| 3303 | return stub_name; |
| 3304 | } |
| 3305 | |
| 3306 | |
| 3307 | /* Add a new stub entry to the stub hash. Not all fields of the new |
| 3308 | stub entry are initialised. */ |
| 3309 | |
| 3310 | static struct elf32_avr_stub_hash_entry * |
| 3311 | avr_add_stub (const char *stub_name, |
| 3312 | struct elf32_avr_link_hash_table *htab) |
| 3313 | { |
| 3314 | struct elf32_avr_stub_hash_entry *hsh; |
| 3315 | |
| 3316 | /* Enter this entry into the linker stub hash table. */ |
| 3317 | hsh = avr_stub_hash_lookup (&htab->bstab, stub_name, TRUE, FALSE); |
| 3318 | |
| 3319 | if (hsh == NULL) |
| 3320 | { |
| 3321 | /* xgettext:c-format */ |
| 3322 | _bfd_error_handler (_("cannot create stub entry %s"), stub_name); |
| 3323 | return NULL; |
| 3324 | } |
| 3325 | |
| 3326 | hsh->stub_offset = 0; |
| 3327 | return hsh; |
| 3328 | } |
| 3329 | |
| 3330 | /* We assume that there is already space allocated for the stub section |
| 3331 | contents and that before building the stubs the section size is |
| 3332 | initialized to 0. We assume that within the stub hash table entry, |
| 3333 | the absolute position of the jmp target has been written in the |
| 3334 | target_value field. We write here the offset of the generated jmp insn |
| 3335 | relative to the trampoline section start to the stub_offset entry in |
| 3336 | the stub hash table entry. */ |
| 3337 | |
| 3338 | static bfd_boolean |
| 3339 | avr_build_one_stub (struct bfd_hash_entry *bh, void *in_arg) |
| 3340 | { |
| 3341 | struct elf32_avr_stub_hash_entry *hsh; |
| 3342 | struct bfd_link_info *info; |
| 3343 | struct elf32_avr_link_hash_table *htab; |
| 3344 | bfd *stub_bfd; |
| 3345 | bfd_byte *loc; |
| 3346 | bfd_vma target; |
| 3347 | bfd_vma starget; |
| 3348 | |
| 3349 | /* Basic opcode */ |
| 3350 | bfd_vma jmp_insn = 0x0000940c; |
| 3351 | |
| 3352 | /* Massage our args to the form they really have. */ |
| 3353 | hsh = avr_stub_hash_entry (bh); |
| 3354 | |
| 3355 | if (!hsh->is_actually_needed) |
| 3356 | return TRUE; |
| 3357 | |
| 3358 | info = (struct bfd_link_info *) in_arg; |
| 3359 | |
| 3360 | htab = avr_link_hash_table (info); |
| 3361 | if (htab == NULL) |
| 3362 | return FALSE; |
| 3363 | |
| 3364 | target = hsh->target_value; |
| 3365 | |
| 3366 | /* Make a note of the offset within the stubs for this entry. */ |
| 3367 | hsh->stub_offset = htab->stub_sec->size; |
| 3368 | loc = htab->stub_sec->contents + hsh->stub_offset; |
| 3369 | |
| 3370 | stub_bfd = htab->stub_sec->owner; |
| 3371 | |
| 3372 | if (debug_stubs) |
| 3373 | printf ("Building one Stub. Address: 0x%x, Offset: 0x%x\n", |
| 3374 | (unsigned int) target, |
| 3375 | (unsigned int) hsh->stub_offset); |
| 3376 | |
| 3377 | /* We now have to add the information on the jump target to the bare |
| 3378 | opcode bits already set in jmp_insn. */ |
| 3379 | |
| 3380 | /* Check for the alignment of the address. */ |
| 3381 | if (target & 1) |
| 3382 | return FALSE; |
| 3383 | |
| 3384 | starget = target >> 1; |
| 3385 | jmp_insn |= ((starget & 0x10000) | ((starget << 3) & 0x1f00000)) >> 16; |
| 3386 | bfd_put_16 (stub_bfd, jmp_insn, loc); |
| 3387 | bfd_put_16 (stub_bfd, (bfd_vma) starget & 0xffff, loc + 2); |
| 3388 | |
| 3389 | htab->stub_sec->size += 4; |
| 3390 | |
| 3391 | /* Now add the entries in the address mapping table if there is still |
| 3392 | space left. */ |
| 3393 | { |
| 3394 | unsigned int nr; |
| 3395 | |
| 3396 | nr = htab->amt_entry_cnt + 1; |
| 3397 | if (nr <= htab->amt_max_entry_cnt) |
| 3398 | { |
| 3399 | htab->amt_entry_cnt = nr; |
| 3400 | |
| 3401 | htab->amt_stub_offsets[nr - 1] = hsh->stub_offset; |
| 3402 | htab->amt_destination_addr[nr - 1] = target; |
| 3403 | } |
| 3404 | } |
| 3405 | |
| 3406 | return TRUE; |
| 3407 | } |
| 3408 | |
| 3409 | static bfd_boolean |
| 3410 | avr_mark_stub_not_to_be_necessary (struct bfd_hash_entry *bh, |
| 3411 | void *in_arg ATTRIBUTE_UNUSED) |
| 3412 | { |
| 3413 | struct elf32_avr_stub_hash_entry *hsh; |
| 3414 | |
| 3415 | hsh = avr_stub_hash_entry (bh); |
| 3416 | hsh->is_actually_needed = FALSE; |
| 3417 | |
| 3418 | return TRUE; |
| 3419 | } |
| 3420 | |
| 3421 | static bfd_boolean |
| 3422 | avr_size_one_stub (struct bfd_hash_entry *bh, void *in_arg) |
| 3423 | { |
| 3424 | struct elf32_avr_stub_hash_entry *hsh; |
| 3425 | struct elf32_avr_link_hash_table *htab; |
| 3426 | int size; |
| 3427 | |
| 3428 | /* Massage our args to the form they really have. */ |
| 3429 | hsh = avr_stub_hash_entry (bh); |
| 3430 | htab = in_arg; |
| 3431 | |
| 3432 | if (hsh->is_actually_needed) |
| 3433 | size = 4; |
| 3434 | else |
| 3435 | size = 0; |
| 3436 | |
| 3437 | htab->stub_sec->size += size; |
| 3438 | return TRUE; |
| 3439 | } |
| 3440 | |
| 3441 | void |
| 3442 | elf32_avr_setup_params (struct bfd_link_info *info, |
| 3443 | bfd *avr_stub_bfd, |
| 3444 | asection *avr_stub_section, |
| 3445 | bfd_boolean no_stubs, |
| 3446 | bfd_boolean deb_stubs, |
| 3447 | bfd_boolean deb_relax, |
| 3448 | bfd_vma pc_wrap_around, |
| 3449 | bfd_boolean call_ret_replacement) |
| 3450 | { |
| 3451 | struct elf32_avr_link_hash_table *htab = avr_link_hash_table (info); |
| 3452 | |
| 3453 | if (htab == NULL) |
| 3454 | return; |
| 3455 | htab->stub_sec = avr_stub_section; |
| 3456 | htab->stub_bfd = avr_stub_bfd; |
| 3457 | htab->no_stubs = no_stubs; |
| 3458 | |
| 3459 | debug_relax = deb_relax; |
| 3460 | debug_stubs = deb_stubs; |
| 3461 | avr_pc_wrap_around = pc_wrap_around; |
| 3462 | avr_replace_call_ret_sequences = call_ret_replacement; |
| 3463 | } |
| 3464 | |
| 3465 | |
| 3466 | /* Set up various things so that we can make a list of input sections |
| 3467 | for each output section included in the link. Returns -1 on error, |
| 3468 | 0 when no stubs will be needed, and 1 on success. It also sets |
| 3469 | information on the stubs bfd and the stub section in the info |
| 3470 | struct. */ |
| 3471 | |
| 3472 | int |
| 3473 | elf32_avr_setup_section_lists (bfd *output_bfd, |
| 3474 | struct bfd_link_info *info) |
| 3475 | { |
| 3476 | bfd *input_bfd; |
| 3477 | unsigned int bfd_count; |
| 3478 | unsigned int top_id, top_index; |
| 3479 | asection *section; |
| 3480 | asection **input_list, **list; |
| 3481 | bfd_size_type amt; |
| 3482 | struct elf32_avr_link_hash_table *htab = avr_link_hash_table (info); |
| 3483 | |
| 3484 | if (htab == NULL || htab->no_stubs) |
| 3485 | return 0; |
| 3486 | |
| 3487 | /* Count the number of input BFDs and find the top input section id. */ |
| 3488 | for (input_bfd = info->input_bfds, bfd_count = 0, top_id = 0; |
| 3489 | input_bfd != NULL; |
| 3490 | input_bfd = input_bfd->link.next) |
| 3491 | { |
| 3492 | bfd_count += 1; |
| 3493 | for (section = input_bfd->sections; |
| 3494 | section != NULL; |
| 3495 | section = section->next) |
| 3496 | if (top_id < section->id) |
| 3497 | top_id = section->id; |
| 3498 | } |
| 3499 | |
| 3500 | htab->bfd_count = bfd_count; |
| 3501 | |
| 3502 | /* We can't use output_bfd->section_count here to find the top output |
| 3503 | section index as some sections may have been removed, and |
| 3504 | strip_excluded_output_sections doesn't renumber the indices. */ |
| 3505 | for (section = output_bfd->sections, top_index = 0; |
| 3506 | section != NULL; |
| 3507 | section = section->next) |
| 3508 | if (top_index < section->index) |
| 3509 | top_index = section->index; |
| 3510 | |
| 3511 | htab->top_index = top_index; |
| 3512 | amt = sizeof (asection *) * (top_index + 1); |
| 3513 | input_list = bfd_malloc (amt); |
| 3514 | htab->input_list = input_list; |
| 3515 | if (input_list == NULL) |
| 3516 | return -1; |
| 3517 | |
| 3518 | /* For sections we aren't interested in, mark their entries with a |
| 3519 | value we can check later. */ |
| 3520 | list = input_list + top_index; |
| 3521 | do |
| 3522 | *list = bfd_abs_section_ptr; |
| 3523 | while (list-- != input_list); |
| 3524 | |
| 3525 | for (section = output_bfd->sections; |
| 3526 | section != NULL; |
| 3527 | section = section->next) |
| 3528 | if ((section->flags & SEC_CODE) != 0) |
| 3529 | input_list[section->index] = NULL; |
| 3530 | |
| 3531 | return 1; |
| 3532 | } |
| 3533 | |
| 3534 | |
| 3535 | /* Read in all local syms for all input bfds, and create hash entries |
| 3536 | for export stubs if we are building a multi-subspace shared lib. |
| 3537 | Returns -1 on error, 0 otherwise. */ |
| 3538 | |
| 3539 | static int |
| 3540 | get_local_syms (bfd *input_bfd, struct bfd_link_info *info) |
| 3541 | { |
| 3542 | unsigned int bfd_indx; |
| 3543 | Elf_Internal_Sym *local_syms, **all_local_syms; |
| 3544 | struct elf32_avr_link_hash_table *htab = avr_link_hash_table (info); |
| 3545 | bfd_size_type amt; |
| 3546 | |
| 3547 | if (htab == NULL) |
| 3548 | return -1; |
| 3549 | |
| 3550 | /* We want to read in symbol extension records only once. To do this |
| 3551 | we need to read in the local symbols in parallel and save them for |
| 3552 | later use; so hold pointers to the local symbols in an array. */ |
| 3553 | amt = sizeof (Elf_Internal_Sym *) * htab->bfd_count; |
| 3554 | all_local_syms = bfd_zmalloc (amt); |
| 3555 | htab->all_local_syms = all_local_syms; |
| 3556 | if (all_local_syms == NULL) |
| 3557 | return -1; |
| 3558 | |
| 3559 | /* Walk over all the input BFDs, swapping in local symbols. |
| 3560 | If we are creating a shared library, create hash entries for the |
| 3561 | export stubs. */ |
| 3562 | for (bfd_indx = 0; |
| 3563 | input_bfd != NULL; |
| 3564 | input_bfd = input_bfd->link.next, bfd_indx++) |
| 3565 | { |
| 3566 | Elf_Internal_Shdr *symtab_hdr; |
| 3567 | |
| 3568 | /* We'll need the symbol table in a second. */ |
| 3569 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 3570 | if (symtab_hdr->sh_info == 0) |
| 3571 | continue; |
| 3572 | |
| 3573 | /* We need an array of the local symbols attached to the input bfd. */ |
| 3574 | local_syms = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 3575 | if (local_syms == NULL) |
| 3576 | { |
| 3577 | local_syms = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, |
| 3578 | symtab_hdr->sh_info, 0, |
| 3579 | NULL, NULL, NULL); |
| 3580 | /* Cache them for elf_link_input_bfd. */ |
| 3581 | symtab_hdr->contents = (unsigned char *) local_syms; |
| 3582 | } |
| 3583 | if (local_syms == NULL) |
| 3584 | return -1; |
| 3585 | |
| 3586 | all_local_syms[bfd_indx] = local_syms; |
| 3587 | } |
| 3588 | |
| 3589 | return 0; |
| 3590 | } |
| 3591 | |
| 3592 | #define ADD_DUMMY_STUBS_FOR_DEBUGGING 0 |
| 3593 | |
| 3594 | bfd_boolean |
| 3595 | elf32_avr_size_stubs (bfd *output_bfd, |
| 3596 | struct bfd_link_info *info, |
| 3597 | bfd_boolean is_prealloc_run) |
| 3598 | { |
| 3599 | struct elf32_avr_link_hash_table *htab; |
| 3600 | int stub_changed = 0; |
| 3601 | |
| 3602 | htab = avr_link_hash_table (info); |
| 3603 | if (htab == NULL) |
| 3604 | return FALSE; |
| 3605 | |
| 3606 | /* At this point we initialize htab->vector_base |
| 3607 | To the start of the text output section. */ |
| 3608 | htab->vector_base = htab->stub_sec->output_section->vma; |
| 3609 | |
| 3610 | if (get_local_syms (info->input_bfds, info)) |
| 3611 | { |
| 3612 | if (htab->all_local_syms) |
| 3613 | goto error_ret_free_local; |
| 3614 | return FALSE; |
| 3615 | } |
| 3616 | |
| 3617 | if (ADD_DUMMY_STUBS_FOR_DEBUGGING) |
| 3618 | { |
| 3619 | struct elf32_avr_stub_hash_entry *test; |
| 3620 | |
| 3621 | test = avr_add_stub ("Hugo",htab); |
| 3622 | test->target_value = 0x123456; |
| 3623 | test->stub_offset = 13; |
| 3624 | |
| 3625 | test = avr_add_stub ("Hugo2",htab); |
| 3626 | test->target_value = 0x84210; |
| 3627 | test->stub_offset = 14; |
| 3628 | } |
| 3629 | |
| 3630 | while (1) |
| 3631 | { |
| 3632 | bfd *input_bfd; |
| 3633 | unsigned int bfd_indx; |
| 3634 | |
| 3635 | /* We will have to re-generate the stub hash table each time anything |
| 3636 | in memory has changed. */ |
| 3637 | |
| 3638 | bfd_hash_traverse (&htab->bstab, avr_mark_stub_not_to_be_necessary, htab); |
| 3639 | for (input_bfd = info->input_bfds, bfd_indx = 0; |
| 3640 | input_bfd != NULL; |
| 3641 | input_bfd = input_bfd->link.next, bfd_indx++) |
| 3642 | { |
| 3643 | Elf_Internal_Shdr *symtab_hdr; |
| 3644 | asection *section; |
| 3645 | Elf_Internal_Sym *local_syms; |
| 3646 | |
| 3647 | /* We'll need the symbol table in a second. */ |
| 3648 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 3649 | if (symtab_hdr->sh_info == 0) |
| 3650 | continue; |
| 3651 | |
| 3652 | local_syms = htab->all_local_syms[bfd_indx]; |
| 3653 | |
| 3654 | /* Walk over each section attached to the input bfd. */ |
| 3655 | for (section = input_bfd->sections; |
| 3656 | section != NULL; |
| 3657 | section = section->next) |
| 3658 | { |
| 3659 | Elf_Internal_Rela *internal_relocs, *irelaend, *irela; |
| 3660 | |
| 3661 | /* If there aren't any relocs, then there's nothing more |
| 3662 | to do. */ |
| 3663 | if ((section->flags & SEC_RELOC) == 0 |
| 3664 | || section->reloc_count == 0) |
| 3665 | continue; |
| 3666 | |
| 3667 | /* If this section is a link-once section that will be |
| 3668 | discarded, then don't create any stubs. */ |
| 3669 | if (section->output_section == NULL |
| 3670 | || section->output_section->owner != output_bfd) |
| 3671 | continue; |
| 3672 | |
| 3673 | /* Get the relocs. */ |
| 3674 | internal_relocs |
| 3675 | = _bfd_elf_link_read_relocs (input_bfd, section, NULL, NULL, |
| 3676 | info->keep_memory); |
| 3677 | if (internal_relocs == NULL) |
| 3678 | goto error_ret_free_local; |
| 3679 | |
| 3680 | /* Now examine each relocation. */ |
| 3681 | irela = internal_relocs; |
| 3682 | irelaend = irela + section->reloc_count; |
| 3683 | for (; irela < irelaend; irela++) |
| 3684 | { |
| 3685 | unsigned int r_type, r_indx; |
| 3686 | struct elf32_avr_stub_hash_entry *hsh; |
| 3687 | asection *sym_sec; |
| 3688 | bfd_vma sym_value; |
| 3689 | bfd_vma destination; |
| 3690 | struct elf_link_hash_entry *hh; |
| 3691 | char *stub_name; |
| 3692 | |
| 3693 | r_type = ELF32_R_TYPE (irela->r_info); |
| 3694 | r_indx = ELF32_R_SYM (irela->r_info); |
| 3695 | |
| 3696 | /* Only look for 16 bit GS relocs. No other reloc will need a |
| 3697 | stub. */ |
| 3698 | if (!((r_type == R_AVR_16_PM) |
| 3699 | || (r_type == R_AVR_LO8_LDI_GS) |
| 3700 | || (r_type == R_AVR_HI8_LDI_GS))) |
| 3701 | continue; |
| 3702 | |
| 3703 | /* Now determine the call target, its name, value, |
| 3704 | section. */ |
| 3705 | sym_sec = NULL; |
| 3706 | sym_value = 0; |
| 3707 | destination = 0; |
| 3708 | hh = NULL; |
| 3709 | if (r_indx < symtab_hdr->sh_info) |
| 3710 | { |
| 3711 | /* It's a local symbol. */ |
| 3712 | Elf_Internal_Sym *sym; |
| 3713 | Elf_Internal_Shdr *hdr; |
| 3714 | unsigned int shndx; |
| 3715 | |
| 3716 | sym = local_syms + r_indx; |
| 3717 | if (ELF_ST_TYPE (sym->st_info) != STT_SECTION) |
| 3718 | sym_value = sym->st_value; |
| 3719 | shndx = sym->st_shndx; |
| 3720 | if (shndx < elf_numsections (input_bfd)) |
| 3721 | { |
| 3722 | hdr = elf_elfsections (input_bfd)[shndx]; |
| 3723 | sym_sec = hdr->bfd_section; |
| 3724 | destination = (sym_value + irela->r_addend |
| 3725 | + sym_sec->output_offset |
| 3726 | + sym_sec->output_section->vma); |
| 3727 | } |
| 3728 | } |
| 3729 | else |
| 3730 | { |
| 3731 | /* It's an external symbol. */ |
| 3732 | int e_indx; |
| 3733 | |
| 3734 | e_indx = r_indx - symtab_hdr->sh_info; |
| 3735 | hh = elf_sym_hashes (input_bfd)[e_indx]; |
| 3736 | |
| 3737 | while (hh->root.type == bfd_link_hash_indirect |
| 3738 | || hh->root.type == bfd_link_hash_warning) |
| 3739 | hh = (struct elf_link_hash_entry *) |
| 3740 | (hh->root.u.i.link); |
| 3741 | |
| 3742 | if (hh->root.type == bfd_link_hash_defined |
| 3743 | || hh->root.type == bfd_link_hash_defweak) |
| 3744 | { |
| 3745 | sym_sec = hh->root.u.def.section; |
| 3746 | sym_value = hh->root.u.def.value; |
| 3747 | if (sym_sec->output_section != NULL) |
| 3748 | destination = (sym_value + irela->r_addend |
| 3749 | + sym_sec->output_offset |
| 3750 | + sym_sec->output_section->vma); |
| 3751 | } |
| 3752 | else if (hh->root.type == bfd_link_hash_undefweak) |
| 3753 | { |
| 3754 | if (! bfd_link_pic (info)) |
| 3755 | continue; |
| 3756 | } |
| 3757 | else if (hh->root.type == bfd_link_hash_undefined) |
| 3758 | { |
| 3759 | if (! (info->unresolved_syms_in_objects == RM_IGNORE |
| 3760 | && (ELF_ST_VISIBILITY (hh->other) |
| 3761 | == STV_DEFAULT))) |
| 3762 | continue; |
| 3763 | } |
| 3764 | else |
| 3765 | { |
| 3766 | bfd_set_error (bfd_error_bad_value); |
| 3767 | |
| 3768 | error_ret_free_internal: |
| 3769 | if (elf_section_data (section)->relocs == NULL) |
| 3770 | free (internal_relocs); |
| 3771 | goto error_ret_free_local; |
| 3772 | } |
| 3773 | } |
| 3774 | |
| 3775 | if (! avr_stub_is_required_for_16_bit_reloc |
| 3776 | (destination - htab->vector_base)) |
| 3777 | { |
| 3778 | if (!is_prealloc_run) |
| 3779 | /* We are having a reloc that does't need a stub. */ |
| 3780 | continue; |
| 3781 | |
| 3782 | /* We don't right now know if a stub will be needed. |
| 3783 | Let's rather be on the safe side. */ |
| 3784 | } |
| 3785 | |
| 3786 | /* Get the name of this stub. */ |
| 3787 | stub_name = avr_stub_name (sym_sec, sym_value, irela); |
| 3788 | |
| 3789 | if (!stub_name) |
| 3790 | goto error_ret_free_internal; |
| 3791 | |
| 3792 | |
| 3793 | hsh = avr_stub_hash_lookup (&htab->bstab, |
| 3794 | stub_name, |
| 3795 | FALSE, FALSE); |
| 3796 | if (hsh != NULL) |
| 3797 | { |
| 3798 | /* The proper stub has already been created. Mark it |
| 3799 | to be used and write the possibly changed destination |
| 3800 | value. */ |
| 3801 | hsh->is_actually_needed = TRUE; |
| 3802 | hsh->target_value = destination; |
| 3803 | free (stub_name); |
| 3804 | continue; |
| 3805 | } |
| 3806 | |
| 3807 | hsh = avr_add_stub (stub_name, htab); |
| 3808 | if (hsh == NULL) |
| 3809 | { |
| 3810 | free (stub_name); |
| 3811 | goto error_ret_free_internal; |
| 3812 | } |
| 3813 | |
| 3814 | hsh->is_actually_needed = TRUE; |
| 3815 | hsh->target_value = destination; |
| 3816 | |
| 3817 | if (debug_stubs) |
| 3818 | printf ("Adding stub with destination 0x%x to the" |
| 3819 | " hash table.\n", (unsigned int) destination); |
| 3820 | if (debug_stubs) |
| 3821 | printf ("(Pre-Alloc run: %i)\n", is_prealloc_run); |
| 3822 | |
| 3823 | stub_changed = TRUE; |
| 3824 | } |
| 3825 | |
| 3826 | /* We're done with the internal relocs, free them. */ |
| 3827 | if (elf_section_data (section)->relocs == NULL) |
| 3828 | free (internal_relocs); |
| 3829 | } |
| 3830 | } |
| 3831 | |
| 3832 | /* Re-Calculate the number of needed stubs. */ |
| 3833 | htab->stub_sec->size = 0; |
| 3834 | bfd_hash_traverse (&htab->bstab, avr_size_one_stub, htab); |
| 3835 | |
| 3836 | if (!stub_changed) |
| 3837 | break; |
| 3838 | |
| 3839 | stub_changed = FALSE; |
| 3840 | } |
| 3841 | |
| 3842 | free (htab->all_local_syms); |
| 3843 | return TRUE; |
| 3844 | |
| 3845 | error_ret_free_local: |
| 3846 | free (htab->all_local_syms); |
| 3847 | return FALSE; |
| 3848 | } |
| 3849 | |
| 3850 | |
| 3851 | /* Build all the stubs associated with the current output file. The |
| 3852 | stubs are kept in a hash table attached to the main linker hash |
| 3853 | table. We also set up the .plt entries for statically linked PIC |
| 3854 | functions here. This function is called via hppaelf_finish in the |
| 3855 | linker. */ |
| 3856 | |
| 3857 | bfd_boolean |
| 3858 | elf32_avr_build_stubs (struct bfd_link_info *info) |
| 3859 | { |
| 3860 | asection *stub_sec; |
| 3861 | struct bfd_hash_table *table; |
| 3862 | struct elf32_avr_link_hash_table *htab; |
| 3863 | bfd_size_type total_size = 0; |
| 3864 | |
| 3865 | htab = avr_link_hash_table (info); |
| 3866 | if (htab == NULL) |
| 3867 | return FALSE; |
| 3868 | |
| 3869 | /* In case that there were several stub sections: */ |
| 3870 | for (stub_sec = htab->stub_bfd->sections; |
| 3871 | stub_sec != NULL; |
| 3872 | stub_sec = stub_sec->next) |
| 3873 | { |
| 3874 | bfd_size_type size; |
| 3875 | |
| 3876 | /* Allocate memory to hold the linker stubs. */ |
| 3877 | size = stub_sec->size; |
| 3878 | total_size += size; |
| 3879 | |
| 3880 | stub_sec->contents = bfd_zalloc (htab->stub_bfd, size); |
| 3881 | if (stub_sec->contents == NULL && size != 0) |
| 3882 | return FALSE; |
| 3883 | stub_sec->size = 0; |
| 3884 | } |
| 3885 | |
| 3886 | /* Allocate memory for the adress mapping table. */ |
| 3887 | htab->amt_entry_cnt = 0; |
| 3888 | htab->amt_max_entry_cnt = total_size / 4; |
| 3889 | htab->amt_stub_offsets = bfd_malloc (sizeof (bfd_vma) |
| 3890 | * htab->amt_max_entry_cnt); |
| 3891 | htab->amt_destination_addr = bfd_malloc (sizeof (bfd_vma) |
| 3892 | * htab->amt_max_entry_cnt ); |
| 3893 | |
| 3894 | if (debug_stubs) |
| 3895 | printf ("Allocating %i entries in the AMT\n", htab->amt_max_entry_cnt); |
| 3896 | |
| 3897 | /* Build the stubs as directed by the stub hash table. */ |
| 3898 | table = &htab->bstab; |
| 3899 | bfd_hash_traverse (table, avr_build_one_stub, info); |
| 3900 | |
| 3901 | if (debug_stubs) |
| 3902 | printf ("Final Stub section Size: %i\n", (int) htab->stub_sec->size); |
| 3903 | |
| 3904 | return TRUE; |
| 3905 | } |
| 3906 | |
| 3907 | /* Callback used by QSORT to order relocations AP and BP. */ |
| 3908 | |
| 3909 | static int |
| 3910 | internal_reloc_compare (const void *ap, const void *bp) |
| 3911 | { |
| 3912 | const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap; |
| 3913 | const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp; |
| 3914 | |
| 3915 | if (a->r_offset != b->r_offset) |
| 3916 | return (a->r_offset - b->r_offset); |
| 3917 | |
| 3918 | /* We don't need to sort on these criteria for correctness, |
| 3919 | but enforcing a more strict ordering prevents unstable qsort |
| 3920 | from behaving differently with different implementations. |
| 3921 | Without the code below we get correct but different results |
| 3922 | on Solaris 2.7 and 2.8. We would like to always produce the |
| 3923 | same results no matter the host. */ |
| 3924 | |
| 3925 | if (a->r_info != b->r_info) |
| 3926 | return (a->r_info - b->r_info); |
| 3927 | |
| 3928 | return (a->r_addend - b->r_addend); |
| 3929 | } |
| 3930 | |
| 3931 | /* Return true if ADDRESS is within the vma range of SECTION from ABFD. */ |
| 3932 | |
| 3933 | static bfd_boolean |
| 3934 | avr_is_section_for_address (bfd *abfd, asection *section, bfd_vma address) |
| 3935 | { |
| 3936 | bfd_vma vma; |
| 3937 | bfd_size_type size; |
| 3938 | |
| 3939 | vma = bfd_get_section_vma (abfd, section); |
| 3940 | if (address < vma) |
| 3941 | return FALSE; |
| 3942 | |
| 3943 | size = section->size; |
| 3944 | if (address >= vma + size) |
| 3945 | return FALSE; |
| 3946 | |
| 3947 | return TRUE; |
| 3948 | } |
| 3949 | |
| 3950 | /* Data structure used by AVR_FIND_SECTION_FOR_ADDRESS. */ |
| 3951 | |
| 3952 | struct avr_find_section_data |
| 3953 | { |
| 3954 | /* The address we're looking for. */ |
| 3955 | bfd_vma address; |
| 3956 | |
| 3957 | /* The section we've found. */ |
| 3958 | asection *section; |
| 3959 | }; |
| 3960 | |
| 3961 | /* Helper function to locate the section holding a certain virtual memory |
| 3962 | address. This is called via bfd_map_over_sections. The DATA is an |
| 3963 | instance of STRUCT AVR_FIND_SECTION_DATA, the address field of which |
| 3964 | has been set to the address to search for, and the section field has |
| 3965 | been set to NULL. If SECTION from ABFD contains ADDRESS then the |
| 3966 | section field in DATA will be set to SECTION. As an optimisation, if |
| 3967 | the section field is already non-null then this function does not |
| 3968 | perform any checks, and just returns. */ |
| 3969 | |
| 3970 | static void |
| 3971 | avr_find_section_for_address (bfd *abfd, |
| 3972 | asection *section, void *data) |
| 3973 | { |
| 3974 | struct avr_find_section_data *fs_data |
| 3975 | = (struct avr_find_section_data *) data; |
| 3976 | |
| 3977 | /* Return if already found. */ |
| 3978 | if (fs_data->section != NULL) |
| 3979 | return; |
| 3980 | |
| 3981 | /* If this section isn't part of the addressable code content, skip it. */ |
| 3982 | if ((bfd_get_section_flags (abfd, section) & SEC_ALLOC) == 0 |
| 3983 | && (bfd_get_section_flags (abfd, section) & SEC_CODE) == 0) |
| 3984 | return; |
| 3985 | |
| 3986 | if (avr_is_section_for_address (abfd, section, fs_data->address)) |
| 3987 | fs_data->section = section; |
| 3988 | } |
| 3989 | |
| 3990 | /* Load all of the property records from SEC, a section from ABFD. Return |
| 3991 | a STRUCT AVR_PROPERTY_RECORD_LIST containing all the records. The |
| 3992 | memory for the returned structure, and all of the records pointed too by |
| 3993 | the structure are allocated with a single call to malloc, so, only the |
| 3994 | pointer returned needs to be free'd. */ |
| 3995 | |
| 3996 | static struct avr_property_record_list * |
| 3997 | avr_elf32_load_records_from_section (bfd *abfd, asection *sec) |
| 3998 | { |
| 3999 | char *contents = NULL, *ptr; |
| 4000 | bfd_size_type size, mem_size; |
| 4001 | bfd_byte version, flags; |
| 4002 | uint16_t record_count, i; |
| 4003 | struct avr_property_record_list *r_list = NULL; |
| 4004 | Elf_Internal_Rela *internal_relocs = NULL, *rel, *rel_end; |
| 4005 | struct avr_find_section_data fs_data; |
| 4006 | |
| 4007 | fs_data.section = NULL; |
| 4008 | |
| 4009 | size = bfd_get_section_size (sec); |
| 4010 | contents = bfd_malloc (size); |
| 4011 | bfd_get_section_contents (abfd, sec, contents, 0, size); |
| 4012 | ptr = contents; |
| 4013 | |
| 4014 | /* Load the relocations for the '.avr.prop' section if there are any, and |
| 4015 | sort them. */ |
| 4016 | internal_relocs = (_bfd_elf_link_read_relocs |
| 4017 | (abfd, sec, NULL, NULL, FALSE)); |
| 4018 | if (internal_relocs) |
| 4019 | qsort (internal_relocs, sec->reloc_count, |
| 4020 | sizeof (Elf_Internal_Rela), internal_reloc_compare); |
| 4021 | |
| 4022 | /* There is a header at the start of the property record section SEC, the |
| 4023 | format of this header is: |
| 4024 | uint8_t : version number |
| 4025 | uint8_t : flags |
| 4026 | uint16_t : record counter |
| 4027 | */ |
| 4028 | |
| 4029 | /* Check we have at least got a headers worth of bytes. */ |
| 4030 | if (size < AVR_PROPERTY_SECTION_HEADER_SIZE) |
| 4031 | goto load_failed; |
| 4032 | |
| 4033 | version = *((bfd_byte *) ptr); |
| 4034 | ptr++; |
| 4035 | flags = *((bfd_byte *) ptr); |
| 4036 | ptr++; |
| 4037 | record_count = *((uint16_t *) ptr); |
| 4038 | ptr+=2; |
| 4039 | BFD_ASSERT (ptr - contents == AVR_PROPERTY_SECTION_HEADER_SIZE); |
| 4040 | |
| 4041 | /* Now allocate space for the list structure, and all of the list |
| 4042 | elements in a single block. */ |
| 4043 | mem_size = sizeof (struct avr_property_record_list) |
| 4044 | + sizeof (struct avr_property_record) * record_count; |
| 4045 | r_list = bfd_malloc (mem_size); |
| 4046 | if (r_list == NULL) |
| 4047 | goto load_failed; |
| 4048 | |
| 4049 | r_list->version = version; |
| 4050 | r_list->flags = flags; |
| 4051 | r_list->section = sec; |
| 4052 | r_list->record_count = record_count; |
| 4053 | r_list->records = (struct avr_property_record *) (&r_list [1]); |
| 4054 | size -= AVR_PROPERTY_SECTION_HEADER_SIZE; |
| 4055 | |
| 4056 | /* Check that we understand the version number. There is only one |
| 4057 | version number right now, anything else is an error. */ |
| 4058 | if (r_list->version != AVR_PROPERTY_RECORDS_VERSION) |
| 4059 | goto load_failed; |
| 4060 | |
| 4061 | rel = internal_relocs; |
| 4062 | rel_end = rel + sec->reloc_count; |
| 4063 | for (i = 0; i < record_count; ++i) |
| 4064 | { |
| 4065 | bfd_vma address; |
| 4066 | |
| 4067 | /* Each entry is a 32-bit address, followed by a single byte type. |
| 4068 | After that is the type specific data. We must take care to |
| 4069 | ensure that we don't read beyond the end of the section data. */ |
| 4070 | if (size < 5) |
| 4071 | goto load_failed; |
| 4072 | |
| 4073 | r_list->records [i].section = NULL; |
| 4074 | r_list->records [i].offset = 0; |
| 4075 | |
| 4076 | if (rel) |
| 4077 | { |
| 4078 | /* The offset of the address within the .avr.prop section. */ |
| 4079 | size_t offset = ptr - contents; |
| 4080 | |
| 4081 | while (rel < rel_end && rel->r_offset < offset) |
| 4082 | ++rel; |
| 4083 | |
| 4084 | if (rel == rel_end) |
| 4085 | rel = NULL; |
| 4086 | else if (rel->r_offset == offset) |
| 4087 | { |
| 4088 | /* Find section and section offset. */ |
| 4089 | unsigned long r_symndx; |
| 4090 | |
| 4091 | asection * rel_sec; |
| 4092 | bfd_vma sec_offset; |
| 4093 | |
| 4094 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 4095 | rel_sec = get_elf_r_symndx_section (abfd, r_symndx); |
| 4096 | sec_offset = get_elf_r_symndx_offset (abfd, r_symndx) |
| 4097 | + rel->r_addend; |
| 4098 | |
| 4099 | r_list->records [i].section = rel_sec; |
| 4100 | r_list->records [i].offset = sec_offset; |
| 4101 | } |
| 4102 | } |
| 4103 | |
| 4104 | address = *((uint32_t *) ptr); |
| 4105 | ptr += 4; |
| 4106 | size -= 4; |
| 4107 | |
| 4108 | if (r_list->records [i].section == NULL) |
| 4109 | { |
| 4110 | /* Try to find section and offset from address. */ |
| 4111 | if (fs_data.section != NULL |
| 4112 | && !avr_is_section_for_address (abfd, fs_data.section, |
| 4113 | address)) |
| 4114 | fs_data.section = NULL; |
| 4115 | |
| 4116 | if (fs_data.section == NULL) |
| 4117 | { |
| 4118 | fs_data.address = address; |
| 4119 | bfd_map_over_sections (abfd, avr_find_section_for_address, |
| 4120 | &fs_data); |
| 4121 | } |
| 4122 | |
| 4123 | if (fs_data.section == NULL) |
| 4124 | { |
| 4125 | fprintf (stderr, "Failed to find matching section.\n"); |
| 4126 | goto load_failed; |
| 4127 | } |
| 4128 | |
| 4129 | r_list->records [i].section = fs_data.section; |
| 4130 | r_list->records [i].offset |
| 4131 | = address - bfd_get_section_vma (abfd, fs_data.section); |
| 4132 | } |
| 4133 | |
| 4134 | r_list->records [i].type = *((bfd_byte *) ptr); |
| 4135 | ptr += 1; |
| 4136 | size -= 1; |
| 4137 | |
| 4138 | switch (r_list->records [i].type) |
| 4139 | { |
| 4140 | case RECORD_ORG: |
| 4141 | /* Nothing else to load. */ |
| 4142 | break; |
| 4143 | case RECORD_ORG_AND_FILL: |
| 4144 | /* Just a 4-byte fill to load. */ |
| 4145 | if (size < 4) |
| 4146 | goto load_failed; |
| 4147 | r_list->records [i].data.org.fill = *((uint32_t *) ptr); |
| 4148 | ptr += 4; |
| 4149 | size -= 4; |
| 4150 | break; |
| 4151 | case RECORD_ALIGN: |
| 4152 | /* Just a 4-byte alignment to load. */ |
| 4153 | if (size < 4) |
| 4154 | goto load_failed; |
| 4155 | r_list->records [i].data.align.bytes = *((uint32_t *) ptr); |
| 4156 | ptr += 4; |
| 4157 | size -= 4; |
| 4158 | /* Just initialise PRECEDING_DELETED field, this field is |
| 4159 | used during linker relaxation. */ |
| 4160 | r_list->records [i].data.align.preceding_deleted = 0; |
| 4161 | break; |
| 4162 | case RECORD_ALIGN_AND_FILL: |
| 4163 | /* A 4-byte alignment, and a 4-byte fill to load. */ |
| 4164 | if (size < 8) |
| 4165 | goto load_failed; |
| 4166 | r_list->records [i].data.align.bytes = *((uint32_t *) ptr); |
| 4167 | ptr += 4; |
| 4168 | r_list->records [i].data.align.fill = *((uint32_t *) ptr); |
| 4169 | ptr += 4; |
| 4170 | size -= 8; |
| 4171 | /* Just initialise PRECEDING_DELETED field, this field is |
| 4172 | used during linker relaxation. */ |
| 4173 | r_list->records [i].data.align.preceding_deleted = 0; |
| 4174 | break; |
| 4175 | default: |
| 4176 | goto load_failed; |
| 4177 | } |
| 4178 | } |
| 4179 | |
| 4180 | free (contents); |
| 4181 | if (elf_section_data (sec)->relocs != internal_relocs) |
| 4182 | free (internal_relocs); |
| 4183 | return r_list; |
| 4184 | |
| 4185 | load_failed: |
| 4186 | if (elf_section_data (sec)->relocs != internal_relocs) |
| 4187 | free (internal_relocs); |
| 4188 | free (contents); |
| 4189 | free (r_list); |
| 4190 | return NULL; |
| 4191 | } |
| 4192 | |
| 4193 | /* Load all of the property records from ABFD. See |
| 4194 | AVR_ELF32_LOAD_RECORDS_FROM_SECTION for details of the return value. */ |
| 4195 | |
| 4196 | struct avr_property_record_list * |
| 4197 | avr_elf32_load_property_records (bfd *abfd) |
| 4198 | { |
| 4199 | asection *sec; |
| 4200 | |
| 4201 | /* Find the '.avr.prop' section and load the contents into memory. */ |
| 4202 | sec = bfd_get_section_by_name (abfd, AVR_PROPERTY_RECORD_SECTION_NAME); |
| 4203 | if (sec == NULL) |
| 4204 | return NULL; |
| 4205 | return avr_elf32_load_records_from_section (abfd, sec); |
| 4206 | } |
| 4207 | |
| 4208 | const char * |
| 4209 | avr_elf32_property_record_name (struct avr_property_record *rec) |
| 4210 | { |
| 4211 | const char *str; |
| 4212 | |
| 4213 | switch (rec->type) |
| 4214 | { |
| 4215 | case RECORD_ORG: |
| 4216 | str = "ORG"; |
| 4217 | break; |
| 4218 | case RECORD_ORG_AND_FILL: |
| 4219 | str = "ORG+FILL"; |
| 4220 | break; |
| 4221 | case RECORD_ALIGN: |
| 4222 | str = "ALIGN"; |
| 4223 | break; |
| 4224 | case RECORD_ALIGN_AND_FILL: |
| 4225 | str = "ALIGN+FILL"; |
| 4226 | break; |
| 4227 | default: |
| 4228 | str = "unknown"; |
| 4229 | } |
| 4230 | |
| 4231 | return str; |
| 4232 | } |
| 4233 | |
| 4234 | |
| 4235 | #define ELF_ARCH bfd_arch_avr |
| 4236 | #define ELF_TARGET_ID AVR_ELF_DATA |
| 4237 | #define ELF_MACHINE_CODE EM_AVR |
| 4238 | #define ELF_MACHINE_ALT1 EM_AVR_OLD |
| 4239 | #define ELF_MAXPAGESIZE 1 |
| 4240 | |
| 4241 | #define TARGET_LITTLE_SYM avr_elf32_vec |
| 4242 | #define TARGET_LITTLE_NAME "elf32-avr" |
| 4243 | |
| 4244 | #define bfd_elf32_bfd_link_hash_table_create elf32_avr_link_hash_table_create |
| 4245 | |
| 4246 | #define elf_info_to_howto avr_info_to_howto_rela |
| 4247 | #define elf_info_to_howto_rel NULL |
| 4248 | #define elf_backend_relocate_section elf32_avr_relocate_section |
| 4249 | #define elf_backend_can_gc_sections 1 |
| 4250 | #define elf_backend_rela_normal 1 |
| 4251 | #define elf_backend_final_write_processing \ |
| 4252 | bfd_elf_avr_final_write_processing |
| 4253 | #define elf_backend_object_p elf32_avr_object_p |
| 4254 | |
| 4255 | #define bfd_elf32_bfd_relax_section elf32_avr_relax_section |
| 4256 | #define bfd_elf32_bfd_get_relocated_section_contents \ |
| 4257 | elf32_avr_get_relocated_section_contents |
| 4258 | #define bfd_elf32_new_section_hook elf_avr_new_section_hook |
| 4259 | |
| 4260 | #include "elf32-target.h" |