| 1 | /* AVR-specific support for 32-bit ELF |
| 2 | Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2006, 2007, 2008 |
| 3 | Free Software Foundation, Inc. |
| 4 | Contributed by Denis Chertykov <denisc@overta.ru> |
| 5 | |
| 6 | This file is part of BFD, the Binary File Descriptor library. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 51 Franklin Street - Fifth Floor, |
| 21 | Boston, MA 02110-1301, USA. */ |
| 22 | |
| 23 | #include "sysdep.h" |
| 24 | #include "bfd.h" |
| 25 | #include "libbfd.h" |
| 26 | #include "elf-bfd.h" |
| 27 | #include "elf/avr.h" |
| 28 | #include "elf32-avr.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 | /* Hash table initialization and handling. Code is taken from the hppa port |
| 37 | and adapted to the needs of AVR. */ |
| 38 | |
| 39 | /* We use two hash tables to hold information for linking avr objects. |
| 40 | |
| 41 | The first is the elf32_avr_link_hash_tablse which is derived from the |
| 42 | stanard ELF linker hash table. We use this as a place to attach the other |
| 43 | hash table and some static information. |
| 44 | |
| 45 | The second is the stub hash table which is derived from the base BFD |
| 46 | hash table. The stub hash table holds the information on the linker |
| 47 | stubs. */ |
| 48 | |
| 49 | struct elf32_avr_stub_hash_entry |
| 50 | { |
| 51 | /* Base hash table entry structure. */ |
| 52 | struct bfd_hash_entry bh_root; |
| 53 | |
| 54 | /* Offset within stub_sec of the beginning of this stub. */ |
| 55 | bfd_vma stub_offset; |
| 56 | |
| 57 | /* Given the symbol's value and its section we can determine its final |
| 58 | value when building the stubs (so the stub knows where to jump). */ |
| 59 | bfd_vma target_value; |
| 60 | |
| 61 | /* This way we could mark stubs to be no longer necessary. */ |
| 62 | bfd_boolean is_actually_needed; |
| 63 | }; |
| 64 | |
| 65 | struct elf32_avr_link_hash_table |
| 66 | { |
| 67 | /* The main hash table. */ |
| 68 | struct elf_link_hash_table etab; |
| 69 | |
| 70 | /* The stub hash table. */ |
| 71 | struct bfd_hash_table bstab; |
| 72 | |
| 73 | bfd_boolean no_stubs; |
| 74 | |
| 75 | /* Linker stub bfd. */ |
| 76 | bfd *stub_bfd; |
| 77 | |
| 78 | /* The stub section. */ |
| 79 | asection *stub_sec; |
| 80 | |
| 81 | /* Usually 0, unless we are generating code for a bootloader. Will |
| 82 | be initialized by elf32_avr_size_stubs to the vma offset of the |
| 83 | output section associated with the stub section. */ |
| 84 | bfd_vma vector_base; |
| 85 | |
| 86 | /* Assorted information used by elf32_avr_size_stubs. */ |
| 87 | unsigned int bfd_count; |
| 88 | int top_index; |
| 89 | asection ** input_list; |
| 90 | Elf_Internal_Sym ** all_local_syms; |
| 91 | |
| 92 | /* Tables for mapping vma beyond the 128k boundary to the address of the |
| 93 | corresponding stub. (AMT) |
| 94 | "amt_max_entry_cnt" reflects the number of entries that memory is allocated |
| 95 | for in the "amt_stub_offsets" and "amt_destination_addr" arrays. |
| 96 | "amt_entry_cnt" informs how many of these entries actually contain |
| 97 | useful data. */ |
| 98 | unsigned int amt_entry_cnt; |
| 99 | unsigned int amt_max_entry_cnt; |
| 100 | bfd_vma * amt_stub_offsets; |
| 101 | bfd_vma * amt_destination_addr; |
| 102 | }; |
| 103 | |
| 104 | /* Various hash macros and functions. */ |
| 105 | #define avr_link_hash_table(p) \ |
| 106 | /* PR 3874: Check that we have an AVR style hash table before using it. */\ |
| 107 | ((p)->hash->table.newfunc != elf32_avr_link_hash_newfunc ? NULL : \ |
| 108 | ((struct elf32_avr_link_hash_table *) ((p)->hash))) |
| 109 | |
| 110 | #define avr_stub_hash_entry(ent) \ |
| 111 | ((struct elf32_avr_stub_hash_entry *)(ent)) |
| 112 | |
| 113 | #define avr_stub_hash_lookup(table, string, create, copy) \ |
| 114 | ((struct elf32_avr_stub_hash_entry *) \ |
| 115 | bfd_hash_lookup ((table), (string), (create), (copy))) |
| 116 | |
| 117 | static reloc_howto_type elf_avr_howto_table[] = |
| 118 | { |
| 119 | HOWTO (R_AVR_NONE, /* type */ |
| 120 | 0, /* rightshift */ |
| 121 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 122 | 32, /* bitsize */ |
| 123 | FALSE, /* pc_relative */ |
| 124 | 0, /* bitpos */ |
| 125 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 126 | bfd_elf_generic_reloc, /* special_function */ |
| 127 | "R_AVR_NONE", /* name */ |
| 128 | FALSE, /* partial_inplace */ |
| 129 | 0, /* src_mask */ |
| 130 | 0, /* dst_mask */ |
| 131 | FALSE), /* pcrel_offset */ |
| 132 | |
| 133 | HOWTO (R_AVR_32, /* type */ |
| 134 | 0, /* rightshift */ |
| 135 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 136 | 32, /* bitsize */ |
| 137 | FALSE, /* pc_relative */ |
| 138 | 0, /* bitpos */ |
| 139 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 140 | bfd_elf_generic_reloc, /* special_function */ |
| 141 | "R_AVR_32", /* name */ |
| 142 | FALSE, /* partial_inplace */ |
| 143 | 0xffffffff, /* src_mask */ |
| 144 | 0xffffffff, /* dst_mask */ |
| 145 | FALSE), /* pcrel_offset */ |
| 146 | |
| 147 | /* A 7 bit PC relative relocation. */ |
| 148 | HOWTO (R_AVR_7_PCREL, /* type */ |
| 149 | 1, /* rightshift */ |
| 150 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 151 | 7, /* bitsize */ |
| 152 | TRUE, /* pc_relative */ |
| 153 | 3, /* bitpos */ |
| 154 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 155 | bfd_elf_generic_reloc, /* special_function */ |
| 156 | "R_AVR_7_PCREL", /* name */ |
| 157 | FALSE, /* partial_inplace */ |
| 158 | 0xffff, /* src_mask */ |
| 159 | 0xffff, /* dst_mask */ |
| 160 | TRUE), /* pcrel_offset */ |
| 161 | |
| 162 | /* A 13 bit PC relative relocation. */ |
| 163 | HOWTO (R_AVR_13_PCREL, /* type */ |
| 164 | 1, /* rightshift */ |
| 165 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 166 | 13, /* bitsize */ |
| 167 | TRUE, /* pc_relative */ |
| 168 | 0, /* bitpos */ |
| 169 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 170 | bfd_elf_generic_reloc, /* special_function */ |
| 171 | "R_AVR_13_PCREL", /* name */ |
| 172 | FALSE, /* partial_inplace */ |
| 173 | 0xfff, /* src_mask */ |
| 174 | 0xfff, /* dst_mask */ |
| 175 | TRUE), /* pcrel_offset */ |
| 176 | |
| 177 | /* A 16 bit absolute relocation. */ |
| 178 | HOWTO (R_AVR_16, /* type */ |
| 179 | 0, /* rightshift */ |
| 180 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 181 | 16, /* bitsize */ |
| 182 | FALSE, /* pc_relative */ |
| 183 | 0, /* bitpos */ |
| 184 | complain_overflow_dont, /* complain_on_overflow */ |
| 185 | bfd_elf_generic_reloc, /* special_function */ |
| 186 | "R_AVR_16", /* name */ |
| 187 | FALSE, /* partial_inplace */ |
| 188 | 0xffff, /* src_mask */ |
| 189 | 0xffff, /* dst_mask */ |
| 190 | FALSE), /* pcrel_offset */ |
| 191 | |
| 192 | /* A 16 bit absolute relocation for command address |
| 193 | Will be changed when linker stubs are needed. */ |
| 194 | HOWTO (R_AVR_16_PM, /* type */ |
| 195 | 1, /* rightshift */ |
| 196 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 197 | 16, /* bitsize */ |
| 198 | FALSE, /* pc_relative */ |
| 199 | 0, /* bitpos */ |
| 200 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 201 | bfd_elf_generic_reloc, /* special_function */ |
| 202 | "R_AVR_16_PM", /* name */ |
| 203 | FALSE, /* partial_inplace */ |
| 204 | 0xffff, /* src_mask */ |
| 205 | 0xffff, /* dst_mask */ |
| 206 | FALSE), /* pcrel_offset */ |
| 207 | /* A low 8 bit absolute relocation of 16 bit address. |
| 208 | For LDI command. */ |
| 209 | HOWTO (R_AVR_LO8_LDI, /* type */ |
| 210 | 0, /* rightshift */ |
| 211 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 212 | 8, /* bitsize */ |
| 213 | FALSE, /* pc_relative */ |
| 214 | 0, /* bitpos */ |
| 215 | complain_overflow_dont, /* complain_on_overflow */ |
| 216 | bfd_elf_generic_reloc, /* special_function */ |
| 217 | "R_AVR_LO8_LDI", /* name */ |
| 218 | FALSE, /* partial_inplace */ |
| 219 | 0xffff, /* src_mask */ |
| 220 | 0xffff, /* dst_mask */ |
| 221 | FALSE), /* pcrel_offset */ |
| 222 | /* A high 8 bit absolute relocation of 16 bit address. |
| 223 | For LDI command. */ |
| 224 | HOWTO (R_AVR_HI8_LDI, /* type */ |
| 225 | 8, /* rightshift */ |
| 226 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 227 | 8, /* bitsize */ |
| 228 | FALSE, /* pc_relative */ |
| 229 | 0, /* bitpos */ |
| 230 | complain_overflow_dont, /* complain_on_overflow */ |
| 231 | bfd_elf_generic_reloc, /* special_function */ |
| 232 | "R_AVR_HI8_LDI", /* name */ |
| 233 | FALSE, /* partial_inplace */ |
| 234 | 0xffff, /* src_mask */ |
| 235 | 0xffff, /* dst_mask */ |
| 236 | FALSE), /* pcrel_offset */ |
| 237 | /* A high 6 bit absolute relocation of 22 bit address. |
| 238 | For LDI command. As well second most significant 8 bit value of |
| 239 | a 32 bit link-time constant. */ |
| 240 | HOWTO (R_AVR_HH8_LDI, /* type */ |
| 241 | 16, /* rightshift */ |
| 242 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 243 | 8, /* bitsize */ |
| 244 | FALSE, /* pc_relative */ |
| 245 | 0, /* bitpos */ |
| 246 | complain_overflow_dont, /* complain_on_overflow */ |
| 247 | bfd_elf_generic_reloc, /* special_function */ |
| 248 | "R_AVR_HH8_LDI", /* name */ |
| 249 | FALSE, /* partial_inplace */ |
| 250 | 0xffff, /* src_mask */ |
| 251 | 0xffff, /* dst_mask */ |
| 252 | FALSE), /* pcrel_offset */ |
| 253 | /* A negative low 8 bit absolute relocation of 16 bit address. |
| 254 | For LDI command. */ |
| 255 | HOWTO (R_AVR_LO8_LDI_NEG, /* type */ |
| 256 | 0, /* rightshift */ |
| 257 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 258 | 8, /* bitsize */ |
| 259 | FALSE, /* pc_relative */ |
| 260 | 0, /* bitpos */ |
| 261 | complain_overflow_dont, /* complain_on_overflow */ |
| 262 | bfd_elf_generic_reloc, /* special_function */ |
| 263 | "R_AVR_LO8_LDI_NEG", /* name */ |
| 264 | FALSE, /* partial_inplace */ |
| 265 | 0xffff, /* src_mask */ |
| 266 | 0xffff, /* dst_mask */ |
| 267 | FALSE), /* pcrel_offset */ |
| 268 | /* A negative high 8 bit absolute relocation of 16 bit address. |
| 269 | For LDI command. */ |
| 270 | HOWTO (R_AVR_HI8_LDI_NEG, /* type */ |
| 271 | 8, /* rightshift */ |
| 272 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 273 | 8, /* bitsize */ |
| 274 | FALSE, /* pc_relative */ |
| 275 | 0, /* bitpos */ |
| 276 | complain_overflow_dont, /* complain_on_overflow */ |
| 277 | bfd_elf_generic_reloc, /* special_function */ |
| 278 | "R_AVR_HI8_LDI_NEG", /* name */ |
| 279 | FALSE, /* partial_inplace */ |
| 280 | 0xffff, /* src_mask */ |
| 281 | 0xffff, /* dst_mask */ |
| 282 | FALSE), /* pcrel_offset */ |
| 283 | /* A negative high 6 bit absolute relocation of 22 bit address. |
| 284 | For LDI command. */ |
| 285 | HOWTO (R_AVR_HH8_LDI_NEG, /* type */ |
| 286 | 16, /* rightshift */ |
| 287 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 288 | 8, /* bitsize */ |
| 289 | FALSE, /* pc_relative */ |
| 290 | 0, /* bitpos */ |
| 291 | complain_overflow_dont, /* complain_on_overflow */ |
| 292 | bfd_elf_generic_reloc, /* special_function */ |
| 293 | "R_AVR_HH8_LDI_NEG", /* name */ |
| 294 | FALSE, /* partial_inplace */ |
| 295 | 0xffff, /* src_mask */ |
| 296 | 0xffff, /* dst_mask */ |
| 297 | FALSE), /* pcrel_offset */ |
| 298 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
| 299 | For LDI command. Will not be changed when linker stubs are needed. */ |
| 300 | HOWTO (R_AVR_LO8_LDI_PM, /* type */ |
| 301 | 1, /* rightshift */ |
| 302 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 303 | 8, /* bitsize */ |
| 304 | FALSE, /* pc_relative */ |
| 305 | 0, /* bitpos */ |
| 306 | complain_overflow_dont, /* complain_on_overflow */ |
| 307 | bfd_elf_generic_reloc, /* special_function */ |
| 308 | "R_AVR_LO8_LDI_PM", /* name */ |
| 309 | FALSE, /* partial_inplace */ |
| 310 | 0xffff, /* src_mask */ |
| 311 | 0xffff, /* dst_mask */ |
| 312 | FALSE), /* pcrel_offset */ |
| 313 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
| 314 | For LDI command. Will not be changed when linker stubs are needed. */ |
| 315 | HOWTO (R_AVR_HI8_LDI_PM, /* type */ |
| 316 | 9, /* rightshift */ |
| 317 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 318 | 8, /* bitsize */ |
| 319 | FALSE, /* pc_relative */ |
| 320 | 0, /* bitpos */ |
| 321 | complain_overflow_dont, /* complain_on_overflow */ |
| 322 | bfd_elf_generic_reloc, /* special_function */ |
| 323 | "R_AVR_HI8_LDI_PM", /* name */ |
| 324 | FALSE, /* partial_inplace */ |
| 325 | 0xffff, /* src_mask */ |
| 326 | 0xffff, /* dst_mask */ |
| 327 | FALSE), /* pcrel_offset */ |
| 328 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
| 329 | For LDI command. Will not be changed when linker stubs are needed. */ |
| 330 | HOWTO (R_AVR_HH8_LDI_PM, /* type */ |
| 331 | 17, /* rightshift */ |
| 332 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 333 | 8, /* bitsize */ |
| 334 | FALSE, /* pc_relative */ |
| 335 | 0, /* bitpos */ |
| 336 | complain_overflow_dont, /* complain_on_overflow */ |
| 337 | bfd_elf_generic_reloc, /* special_function */ |
| 338 | "R_AVR_HH8_LDI_PM", /* name */ |
| 339 | FALSE, /* partial_inplace */ |
| 340 | 0xffff, /* src_mask */ |
| 341 | 0xffff, /* dst_mask */ |
| 342 | FALSE), /* pcrel_offset */ |
| 343 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
| 344 | For LDI command. Will not be changed when linker stubs are needed. */ |
| 345 | HOWTO (R_AVR_LO8_LDI_PM_NEG, /* type */ |
| 346 | 1, /* rightshift */ |
| 347 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 348 | 8, /* bitsize */ |
| 349 | FALSE, /* pc_relative */ |
| 350 | 0, /* bitpos */ |
| 351 | complain_overflow_dont, /* complain_on_overflow */ |
| 352 | bfd_elf_generic_reloc, /* special_function */ |
| 353 | "R_AVR_LO8_LDI_PM_NEG", /* name */ |
| 354 | FALSE, /* partial_inplace */ |
| 355 | 0xffff, /* src_mask */ |
| 356 | 0xffff, /* dst_mask */ |
| 357 | FALSE), /* pcrel_offset */ |
| 358 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
| 359 | For LDI command. Will not be changed when linker stubs are needed. */ |
| 360 | HOWTO (R_AVR_HI8_LDI_PM_NEG, /* type */ |
| 361 | 9, /* rightshift */ |
| 362 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 363 | 8, /* bitsize */ |
| 364 | FALSE, /* pc_relative */ |
| 365 | 0, /* bitpos */ |
| 366 | complain_overflow_dont, /* complain_on_overflow */ |
| 367 | bfd_elf_generic_reloc, /* special_function */ |
| 368 | "R_AVR_HI8_LDI_PM_NEG", /* name */ |
| 369 | FALSE, /* partial_inplace */ |
| 370 | 0xffff, /* src_mask */ |
| 371 | 0xffff, /* dst_mask */ |
| 372 | FALSE), /* pcrel_offset */ |
| 373 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
| 374 | For LDI command. Will not be changed when linker stubs are needed. */ |
| 375 | HOWTO (R_AVR_HH8_LDI_PM_NEG, /* type */ |
| 376 | 17, /* rightshift */ |
| 377 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 378 | 8, /* bitsize */ |
| 379 | FALSE, /* pc_relative */ |
| 380 | 0, /* bitpos */ |
| 381 | complain_overflow_dont, /* complain_on_overflow */ |
| 382 | bfd_elf_generic_reloc, /* special_function */ |
| 383 | "R_AVR_HH8_LDI_PM_NEG", /* name */ |
| 384 | FALSE, /* partial_inplace */ |
| 385 | 0xffff, /* src_mask */ |
| 386 | 0xffff, /* dst_mask */ |
| 387 | FALSE), /* pcrel_offset */ |
| 388 | /* Relocation for CALL command in ATmega. */ |
| 389 | HOWTO (R_AVR_CALL, /* type */ |
| 390 | 1, /* rightshift */ |
| 391 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 392 | 23, /* bitsize */ |
| 393 | FALSE, /* pc_relative */ |
| 394 | 0, /* bitpos */ |
| 395 | complain_overflow_dont,/* complain_on_overflow */ |
| 396 | bfd_elf_generic_reloc, /* special_function */ |
| 397 | "R_AVR_CALL", /* name */ |
| 398 | FALSE, /* partial_inplace */ |
| 399 | 0xffffffff, /* src_mask */ |
| 400 | 0xffffffff, /* dst_mask */ |
| 401 | FALSE), /* pcrel_offset */ |
| 402 | /* A 16 bit absolute relocation of 16 bit address. |
| 403 | For LDI command. */ |
| 404 | HOWTO (R_AVR_LDI, /* type */ |
| 405 | 0, /* rightshift */ |
| 406 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 407 | 16, /* bitsize */ |
| 408 | FALSE, /* pc_relative */ |
| 409 | 0, /* bitpos */ |
| 410 | complain_overflow_dont,/* complain_on_overflow */ |
| 411 | bfd_elf_generic_reloc, /* special_function */ |
| 412 | "R_AVR_LDI", /* name */ |
| 413 | FALSE, /* partial_inplace */ |
| 414 | 0xffff, /* src_mask */ |
| 415 | 0xffff, /* dst_mask */ |
| 416 | FALSE), /* pcrel_offset */ |
| 417 | /* A 6 bit absolute relocation of 6 bit offset. |
| 418 | For ldd/sdd command. */ |
| 419 | HOWTO (R_AVR_6, /* type */ |
| 420 | 0, /* rightshift */ |
| 421 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 422 | 6, /* bitsize */ |
| 423 | FALSE, /* pc_relative */ |
| 424 | 0, /* bitpos */ |
| 425 | complain_overflow_dont,/* complain_on_overflow */ |
| 426 | bfd_elf_generic_reloc, /* special_function */ |
| 427 | "R_AVR_6", /* name */ |
| 428 | FALSE, /* partial_inplace */ |
| 429 | 0xffff, /* src_mask */ |
| 430 | 0xffff, /* dst_mask */ |
| 431 | FALSE), /* pcrel_offset */ |
| 432 | /* A 6 bit absolute relocation of 6 bit offset. |
| 433 | For sbiw/adiw command. */ |
| 434 | HOWTO (R_AVR_6_ADIW, /* type */ |
| 435 | 0, /* rightshift */ |
| 436 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 437 | 6, /* bitsize */ |
| 438 | FALSE, /* pc_relative */ |
| 439 | 0, /* bitpos */ |
| 440 | complain_overflow_dont,/* complain_on_overflow */ |
| 441 | bfd_elf_generic_reloc, /* special_function */ |
| 442 | "R_AVR_6_ADIW", /* name */ |
| 443 | FALSE, /* partial_inplace */ |
| 444 | 0xffff, /* src_mask */ |
| 445 | 0xffff, /* dst_mask */ |
| 446 | FALSE), /* pcrel_offset */ |
| 447 | /* Most significant 8 bit value of a 32 bit link-time constant. */ |
| 448 | HOWTO (R_AVR_MS8_LDI, /* type */ |
| 449 | 24, /* rightshift */ |
| 450 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 451 | 8, /* bitsize */ |
| 452 | FALSE, /* pc_relative */ |
| 453 | 0, /* bitpos */ |
| 454 | complain_overflow_dont, /* complain_on_overflow */ |
| 455 | bfd_elf_generic_reloc, /* special_function */ |
| 456 | "R_AVR_MS8_LDI", /* name */ |
| 457 | FALSE, /* partial_inplace */ |
| 458 | 0xffff, /* src_mask */ |
| 459 | 0xffff, /* dst_mask */ |
| 460 | FALSE), /* pcrel_offset */ |
| 461 | /* Negative most significant 8 bit value of a 32 bit link-time constant. */ |
| 462 | HOWTO (R_AVR_MS8_LDI_NEG, /* type */ |
| 463 | 24, /* rightshift */ |
| 464 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 465 | 8, /* bitsize */ |
| 466 | FALSE, /* pc_relative */ |
| 467 | 0, /* bitpos */ |
| 468 | complain_overflow_dont, /* complain_on_overflow */ |
| 469 | bfd_elf_generic_reloc, /* special_function */ |
| 470 | "R_AVR_MS8_LDI_NEG", /* name */ |
| 471 | FALSE, /* partial_inplace */ |
| 472 | 0xffff, /* src_mask */ |
| 473 | 0xffff, /* dst_mask */ |
| 474 | FALSE), /* pcrel_offset */ |
| 475 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
| 476 | For LDI command. Will be changed when linker stubs are needed. */ |
| 477 | HOWTO (R_AVR_LO8_LDI_GS, /* type */ |
| 478 | 1, /* rightshift */ |
| 479 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 480 | 8, /* bitsize */ |
| 481 | FALSE, /* pc_relative */ |
| 482 | 0, /* bitpos */ |
| 483 | complain_overflow_dont, /* complain_on_overflow */ |
| 484 | bfd_elf_generic_reloc, /* special_function */ |
| 485 | "R_AVR_LO8_LDI_GS", /* name */ |
| 486 | FALSE, /* partial_inplace */ |
| 487 | 0xffff, /* src_mask */ |
| 488 | 0xffff, /* dst_mask */ |
| 489 | FALSE), /* pcrel_offset */ |
| 490 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
| 491 | For LDI command. Will be changed when linker stubs are needed. */ |
| 492 | HOWTO (R_AVR_HI8_LDI_GS, /* type */ |
| 493 | 9, /* rightshift */ |
| 494 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 495 | 8, /* bitsize */ |
| 496 | FALSE, /* pc_relative */ |
| 497 | 0, /* bitpos */ |
| 498 | complain_overflow_dont, /* complain_on_overflow */ |
| 499 | bfd_elf_generic_reloc, /* special_function */ |
| 500 | "R_AVR_HI8_LDI_GS", /* name */ |
| 501 | FALSE, /* partial_inplace */ |
| 502 | 0xffff, /* src_mask */ |
| 503 | 0xffff, /* dst_mask */ |
| 504 | FALSE) /* pcrel_offset */ |
| 505 | }; |
| 506 | |
| 507 | /* Map BFD reloc types to AVR ELF reloc types. */ |
| 508 | |
| 509 | struct avr_reloc_map |
| 510 | { |
| 511 | bfd_reloc_code_real_type bfd_reloc_val; |
| 512 | unsigned int elf_reloc_val; |
| 513 | }; |
| 514 | |
| 515 | static const struct avr_reloc_map avr_reloc_map[] = |
| 516 | { |
| 517 | { BFD_RELOC_NONE, R_AVR_NONE }, |
| 518 | { BFD_RELOC_32, R_AVR_32 }, |
| 519 | { BFD_RELOC_AVR_7_PCREL, R_AVR_7_PCREL }, |
| 520 | { BFD_RELOC_AVR_13_PCREL, R_AVR_13_PCREL }, |
| 521 | { BFD_RELOC_16, R_AVR_16 }, |
| 522 | { BFD_RELOC_AVR_16_PM, R_AVR_16_PM }, |
| 523 | { BFD_RELOC_AVR_LO8_LDI, R_AVR_LO8_LDI}, |
| 524 | { BFD_RELOC_AVR_HI8_LDI, R_AVR_HI8_LDI }, |
| 525 | { BFD_RELOC_AVR_HH8_LDI, R_AVR_HH8_LDI }, |
| 526 | { BFD_RELOC_AVR_MS8_LDI, R_AVR_MS8_LDI }, |
| 527 | { BFD_RELOC_AVR_LO8_LDI_NEG, R_AVR_LO8_LDI_NEG }, |
| 528 | { BFD_RELOC_AVR_HI8_LDI_NEG, R_AVR_HI8_LDI_NEG }, |
| 529 | { BFD_RELOC_AVR_HH8_LDI_NEG, R_AVR_HH8_LDI_NEG }, |
| 530 | { BFD_RELOC_AVR_MS8_LDI_NEG, R_AVR_MS8_LDI_NEG }, |
| 531 | { BFD_RELOC_AVR_LO8_LDI_PM, R_AVR_LO8_LDI_PM }, |
| 532 | { BFD_RELOC_AVR_LO8_LDI_GS, R_AVR_LO8_LDI_GS }, |
| 533 | { BFD_RELOC_AVR_HI8_LDI_PM, R_AVR_HI8_LDI_PM }, |
| 534 | { BFD_RELOC_AVR_HI8_LDI_GS, R_AVR_HI8_LDI_GS }, |
| 535 | { BFD_RELOC_AVR_HH8_LDI_PM, R_AVR_HH8_LDI_PM }, |
| 536 | { BFD_RELOC_AVR_LO8_LDI_PM_NEG, R_AVR_LO8_LDI_PM_NEG }, |
| 537 | { BFD_RELOC_AVR_HI8_LDI_PM_NEG, R_AVR_HI8_LDI_PM_NEG }, |
| 538 | { BFD_RELOC_AVR_HH8_LDI_PM_NEG, R_AVR_HH8_LDI_PM_NEG }, |
| 539 | { BFD_RELOC_AVR_CALL, R_AVR_CALL }, |
| 540 | { BFD_RELOC_AVR_LDI, R_AVR_LDI }, |
| 541 | { BFD_RELOC_AVR_6, R_AVR_6 }, |
| 542 | { BFD_RELOC_AVR_6_ADIW, R_AVR_6_ADIW } |
| 543 | }; |
| 544 | |
| 545 | /* Meant to be filled one day with the wrap around address for the |
| 546 | specific device. I.e. should get the value 0x4000 for 16k devices, |
| 547 | 0x8000 for 32k devices and so on. |
| 548 | |
| 549 | We initialize it here with a value of 0x1000000 resulting in |
| 550 | that we will never suggest a wrap-around jump during relaxation. |
| 551 | The logic of the source code later on assumes that in |
| 552 | avr_pc_wrap_around one single bit is set. */ |
| 553 | static bfd_vma avr_pc_wrap_around = 0x10000000; |
| 554 | |
| 555 | /* If this variable holds a value different from zero, the linker relaxation |
| 556 | machine will try to optimize call/ret sequences by a single jump |
| 557 | instruction. This option could be switched off by a linker switch. */ |
| 558 | static int avr_replace_call_ret_sequences = 1; |
| 559 | \f |
| 560 | /* Initialize an entry in the stub hash table. */ |
| 561 | |
| 562 | static struct bfd_hash_entry * |
| 563 | stub_hash_newfunc (struct bfd_hash_entry *entry, |
| 564 | struct bfd_hash_table *table, |
| 565 | const char *string) |
| 566 | { |
| 567 | /* Allocate the structure if it has not already been allocated by a |
| 568 | subclass. */ |
| 569 | if (entry == NULL) |
| 570 | { |
| 571 | entry = bfd_hash_allocate (table, |
| 572 | sizeof (struct elf32_avr_stub_hash_entry)); |
| 573 | if (entry == NULL) |
| 574 | return entry; |
| 575 | } |
| 576 | |
| 577 | /* Call the allocation method of the superclass. */ |
| 578 | entry = bfd_hash_newfunc (entry, table, string); |
| 579 | if (entry != NULL) |
| 580 | { |
| 581 | struct elf32_avr_stub_hash_entry *hsh; |
| 582 | |
| 583 | /* Initialize the local fields. */ |
| 584 | hsh = avr_stub_hash_entry (entry); |
| 585 | hsh->stub_offset = 0; |
| 586 | hsh->target_value = 0; |
| 587 | } |
| 588 | |
| 589 | return entry; |
| 590 | } |
| 591 | |
| 592 | /* This function is just a straight passthrough to the real |
| 593 | function in linker.c. Its prupose is so that its address |
| 594 | can be compared inside the avr_link_hash_table macro. */ |
| 595 | |
| 596 | static struct bfd_hash_entry * |
| 597 | elf32_avr_link_hash_newfunc (struct bfd_hash_entry * entry, |
| 598 | struct bfd_hash_table * table, |
| 599 | const char * string) |
| 600 | { |
| 601 | return _bfd_elf_link_hash_newfunc (entry, table, string); |
| 602 | } |
| 603 | |
| 604 | /* Create the derived linker hash table. The AVR ELF port uses the derived |
| 605 | hash table to keep information specific to the AVR ELF linker (without |
| 606 | using static variables). */ |
| 607 | |
| 608 | static struct bfd_link_hash_table * |
| 609 | elf32_avr_link_hash_table_create (bfd *abfd) |
| 610 | { |
| 611 | struct elf32_avr_link_hash_table *htab; |
| 612 | bfd_size_type amt = sizeof (*htab); |
| 613 | |
| 614 | htab = bfd_malloc (amt); |
| 615 | if (htab == NULL) |
| 616 | return NULL; |
| 617 | |
| 618 | if (!_bfd_elf_link_hash_table_init (&htab->etab, abfd, |
| 619 | elf32_avr_link_hash_newfunc, |
| 620 | sizeof (struct elf_link_hash_entry))) |
| 621 | { |
| 622 | free (htab); |
| 623 | return NULL; |
| 624 | } |
| 625 | |
| 626 | /* Init the stub hash table too. */ |
| 627 | if (!bfd_hash_table_init (&htab->bstab, stub_hash_newfunc, |
| 628 | sizeof (struct elf32_avr_stub_hash_entry))) |
| 629 | return NULL; |
| 630 | |
| 631 | htab->stub_bfd = NULL; |
| 632 | htab->stub_sec = NULL; |
| 633 | |
| 634 | /* Initialize the address mapping table. */ |
| 635 | htab->amt_stub_offsets = NULL; |
| 636 | htab->amt_destination_addr = NULL; |
| 637 | htab->amt_entry_cnt = 0; |
| 638 | htab->amt_max_entry_cnt = 0; |
| 639 | |
| 640 | return &htab->etab.root; |
| 641 | } |
| 642 | |
| 643 | /* Free the derived linker hash table. */ |
| 644 | |
| 645 | static void |
| 646 | elf32_avr_link_hash_table_free (struct bfd_link_hash_table *btab) |
| 647 | { |
| 648 | struct elf32_avr_link_hash_table *htab |
| 649 | = (struct elf32_avr_link_hash_table *) btab; |
| 650 | |
| 651 | /* Free the address mapping table. */ |
| 652 | if (htab->amt_stub_offsets != NULL) |
| 653 | free (htab->amt_stub_offsets); |
| 654 | if (htab->amt_destination_addr != NULL) |
| 655 | free (htab->amt_destination_addr); |
| 656 | |
| 657 | bfd_hash_table_free (&htab->bstab); |
| 658 | _bfd_generic_link_hash_table_free (btab); |
| 659 | } |
| 660 | |
| 661 | /* Calculates the effective distance of a pc relative jump/call. */ |
| 662 | |
| 663 | static int |
| 664 | avr_relative_distance_considering_wrap_around (unsigned int distance) |
| 665 | { |
| 666 | unsigned int wrap_around_mask = avr_pc_wrap_around - 1; |
| 667 | int dist_with_wrap_around = distance & wrap_around_mask; |
| 668 | |
| 669 | if (dist_with_wrap_around > ((int) (avr_pc_wrap_around >> 1))) |
| 670 | dist_with_wrap_around -= avr_pc_wrap_around; |
| 671 | |
| 672 | return dist_with_wrap_around; |
| 673 | } |
| 674 | |
| 675 | |
| 676 | static reloc_howto_type * |
| 677 | bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 678 | bfd_reloc_code_real_type code) |
| 679 | { |
| 680 | unsigned int i; |
| 681 | |
| 682 | for (i = 0; |
| 683 | i < sizeof (avr_reloc_map) / sizeof (struct avr_reloc_map); |
| 684 | i++) |
| 685 | if (avr_reloc_map[i].bfd_reloc_val == code) |
| 686 | return &elf_avr_howto_table[avr_reloc_map[i].elf_reloc_val]; |
| 687 | |
| 688 | return NULL; |
| 689 | } |
| 690 | |
| 691 | static reloc_howto_type * |
| 692 | bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 693 | const char *r_name) |
| 694 | { |
| 695 | unsigned int i; |
| 696 | |
| 697 | for (i = 0; |
| 698 | i < sizeof (elf_avr_howto_table) / sizeof (elf_avr_howto_table[0]); |
| 699 | i++) |
| 700 | if (elf_avr_howto_table[i].name != NULL |
| 701 | && strcasecmp (elf_avr_howto_table[i].name, r_name) == 0) |
| 702 | return &elf_avr_howto_table[i]; |
| 703 | |
| 704 | return NULL; |
| 705 | } |
| 706 | |
| 707 | /* Set the howto pointer for an AVR ELF reloc. */ |
| 708 | |
| 709 | static void |
| 710 | avr_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED, |
| 711 | arelent *cache_ptr, |
| 712 | Elf_Internal_Rela *dst) |
| 713 | { |
| 714 | unsigned int r_type; |
| 715 | |
| 716 | r_type = ELF32_R_TYPE (dst->r_info); |
| 717 | BFD_ASSERT (r_type < (unsigned int) R_AVR_max); |
| 718 | cache_ptr->howto = &elf_avr_howto_table[r_type]; |
| 719 | } |
| 720 | |
| 721 | /* Look through the relocs for a section during the first phase. |
| 722 | Since we don't do .gots or .plts, we just need to consider the |
| 723 | virtual table relocs for gc. */ |
| 724 | |
| 725 | static bfd_boolean |
| 726 | elf32_avr_check_relocs (bfd *abfd, |
| 727 | struct bfd_link_info *info, |
| 728 | asection *sec, |
| 729 | const Elf_Internal_Rela *relocs) |
| 730 | { |
| 731 | Elf_Internal_Shdr *symtab_hdr; |
| 732 | struct elf_link_hash_entry **sym_hashes; |
| 733 | const Elf_Internal_Rela *rel; |
| 734 | const Elf_Internal_Rela *rel_end; |
| 735 | |
| 736 | if (info->relocatable) |
| 737 | return TRUE; |
| 738 | |
| 739 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 740 | sym_hashes = elf_sym_hashes (abfd); |
| 741 | |
| 742 | rel_end = relocs + sec->reloc_count; |
| 743 | for (rel = relocs; rel < rel_end; rel++) |
| 744 | { |
| 745 | struct elf_link_hash_entry *h; |
| 746 | unsigned long r_symndx; |
| 747 | |
| 748 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 749 | if (r_symndx < symtab_hdr->sh_info) |
| 750 | h = NULL; |
| 751 | else |
| 752 | { |
| 753 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 754 | while (h->root.type == bfd_link_hash_indirect |
| 755 | || h->root.type == bfd_link_hash_warning) |
| 756 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 757 | } |
| 758 | } |
| 759 | |
| 760 | return TRUE; |
| 761 | } |
| 762 | |
| 763 | static bfd_boolean |
| 764 | avr_stub_is_required_for_16_bit_reloc (bfd_vma relocation) |
| 765 | { |
| 766 | return (relocation >= 0x020000); |
| 767 | } |
| 768 | |
| 769 | /* Returns the address of the corresponding stub if there is one. |
| 770 | Returns otherwise an address above 0x020000. This function |
| 771 | could also be used, if there is no knowledge on the section where |
| 772 | the destination is found. */ |
| 773 | |
| 774 | static bfd_vma |
| 775 | avr_get_stub_addr (bfd_vma srel, |
| 776 | struct elf32_avr_link_hash_table *htab) |
| 777 | { |
| 778 | unsigned int index; |
| 779 | bfd_vma stub_sec_addr = |
| 780 | (htab->stub_sec->output_section->vma + |
| 781 | htab->stub_sec->output_offset); |
| 782 | |
| 783 | for (index = 0; index < htab->amt_max_entry_cnt; index ++) |
| 784 | if (htab->amt_destination_addr[index] == srel) |
| 785 | return htab->amt_stub_offsets[index] + stub_sec_addr; |
| 786 | |
| 787 | /* Return an address that could not be reached by 16 bit relocs. */ |
| 788 | return 0x020000; |
| 789 | } |
| 790 | |
| 791 | /* Perform a single relocation. By default we use the standard BFD |
| 792 | routines, but a few relocs, we have to do them ourselves. */ |
| 793 | |
| 794 | static bfd_reloc_status_type |
| 795 | avr_final_link_relocate (reloc_howto_type * howto, |
| 796 | bfd * input_bfd, |
| 797 | asection * input_section, |
| 798 | bfd_byte * contents, |
| 799 | Elf_Internal_Rela * rel, |
| 800 | bfd_vma relocation, |
| 801 | struct elf32_avr_link_hash_table * htab) |
| 802 | { |
| 803 | bfd_reloc_status_type r = bfd_reloc_ok; |
| 804 | bfd_vma x; |
| 805 | bfd_signed_vma srel; |
| 806 | bfd_signed_vma reloc_addr; |
| 807 | bfd_boolean use_stubs = FALSE; |
| 808 | /* Usually is 0, unless we are generating code for a bootloader. */ |
| 809 | bfd_signed_vma base_addr = htab->vector_base; |
| 810 | |
| 811 | /* Absolute addr of the reloc in the final excecutable. */ |
| 812 | reloc_addr = rel->r_offset + input_section->output_section->vma |
| 813 | + input_section->output_offset; |
| 814 | |
| 815 | switch (howto->type) |
| 816 | { |
| 817 | case R_AVR_7_PCREL: |
| 818 | contents += rel->r_offset; |
| 819 | srel = (bfd_signed_vma) relocation; |
| 820 | srel += rel->r_addend; |
| 821 | srel -= rel->r_offset; |
| 822 | srel -= 2; /* Branch instructions add 2 to the PC... */ |
| 823 | srel -= (input_section->output_section->vma + |
| 824 | input_section->output_offset); |
| 825 | |
| 826 | if (srel & 1) |
| 827 | return bfd_reloc_outofrange; |
| 828 | if (srel > ((1 << 7) - 1) || (srel < - (1 << 7))) |
| 829 | return bfd_reloc_overflow; |
| 830 | x = bfd_get_16 (input_bfd, contents); |
| 831 | x = (x & 0xfc07) | (((srel >> 1) << 3) & 0x3f8); |
| 832 | bfd_put_16 (input_bfd, x, contents); |
| 833 | break; |
| 834 | |
| 835 | case R_AVR_13_PCREL: |
| 836 | contents += rel->r_offset; |
| 837 | srel = (bfd_signed_vma) relocation; |
| 838 | srel += rel->r_addend; |
| 839 | srel -= rel->r_offset; |
| 840 | srel -= 2; /* Branch instructions add 2 to the PC... */ |
| 841 | srel -= (input_section->output_section->vma + |
| 842 | input_section->output_offset); |
| 843 | |
| 844 | if (srel & 1) |
| 845 | return bfd_reloc_outofrange; |
| 846 | |
| 847 | srel = avr_relative_distance_considering_wrap_around (srel); |
| 848 | |
| 849 | /* AVR addresses commands as words. */ |
| 850 | srel >>= 1; |
| 851 | |
| 852 | /* Check for overflow. */ |
| 853 | if (srel < -2048 || srel > 2047) |
| 854 | { |
| 855 | /* Relative distance is too large. */ |
| 856 | |
| 857 | /* Always apply WRAPAROUND for avr2 and avr4. */ |
| 858 | switch (bfd_get_mach (input_bfd)) |
| 859 | { |
| 860 | case bfd_mach_avr2: |
| 861 | case bfd_mach_avr4: |
| 862 | break; |
| 863 | |
| 864 | default: |
| 865 | return bfd_reloc_overflow; |
| 866 | } |
| 867 | } |
| 868 | |
| 869 | x = bfd_get_16 (input_bfd, contents); |
| 870 | x = (x & 0xf000) | (srel & 0xfff); |
| 871 | bfd_put_16 (input_bfd, x, contents); |
| 872 | break; |
| 873 | |
| 874 | case R_AVR_LO8_LDI: |
| 875 | contents += rel->r_offset; |
| 876 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 877 | x = bfd_get_16 (input_bfd, contents); |
| 878 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 879 | bfd_put_16 (input_bfd, x, contents); |
| 880 | break; |
| 881 | |
| 882 | case R_AVR_LDI: |
| 883 | contents += rel->r_offset; |
| 884 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 885 | if (((srel > 0) && (srel & 0xffff) > 255) |
| 886 | || ((srel < 0) && ((-srel) & 0xffff) > 128)) |
| 887 | /* Remove offset for data/eeprom section. */ |
| 888 | return bfd_reloc_overflow; |
| 889 | |
| 890 | x = bfd_get_16 (input_bfd, contents); |
| 891 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 892 | bfd_put_16 (input_bfd, x, contents); |
| 893 | break; |
| 894 | |
| 895 | case R_AVR_6: |
| 896 | contents += rel->r_offset; |
| 897 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 898 | if (((srel & 0xffff) > 63) || (srel < 0)) |
| 899 | /* Remove offset for data/eeprom section. */ |
| 900 | return bfd_reloc_overflow; |
| 901 | x = bfd_get_16 (input_bfd, contents); |
| 902 | x = (x & 0xd3f8) | ((srel & 7) | ((srel & (3 << 3)) << 7) |
| 903 | | ((srel & (1 << 5)) << 8)); |
| 904 | bfd_put_16 (input_bfd, x, contents); |
| 905 | break; |
| 906 | |
| 907 | case R_AVR_6_ADIW: |
| 908 | contents += rel->r_offset; |
| 909 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 910 | if (((srel & 0xffff) > 63) || (srel < 0)) |
| 911 | /* Remove offset for data/eeprom section. */ |
| 912 | return bfd_reloc_overflow; |
| 913 | x = bfd_get_16 (input_bfd, contents); |
| 914 | x = (x & 0xff30) | (srel & 0xf) | ((srel & 0x30) << 2); |
| 915 | bfd_put_16 (input_bfd, x, contents); |
| 916 | break; |
| 917 | |
| 918 | case R_AVR_HI8_LDI: |
| 919 | contents += rel->r_offset; |
| 920 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 921 | srel = (srel >> 8) & 0xff; |
| 922 | x = bfd_get_16 (input_bfd, contents); |
| 923 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 924 | bfd_put_16 (input_bfd, x, contents); |
| 925 | break; |
| 926 | |
| 927 | case R_AVR_HH8_LDI: |
| 928 | contents += rel->r_offset; |
| 929 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 930 | srel = (srel >> 16) & 0xff; |
| 931 | x = bfd_get_16 (input_bfd, contents); |
| 932 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 933 | bfd_put_16 (input_bfd, x, contents); |
| 934 | break; |
| 935 | |
| 936 | case R_AVR_MS8_LDI: |
| 937 | contents += rel->r_offset; |
| 938 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 939 | srel = (srel >> 24) & 0xff; |
| 940 | x = bfd_get_16 (input_bfd, contents); |
| 941 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 942 | bfd_put_16 (input_bfd, x, contents); |
| 943 | break; |
| 944 | |
| 945 | case R_AVR_LO8_LDI_NEG: |
| 946 | contents += rel->r_offset; |
| 947 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 948 | srel = -srel; |
| 949 | x = bfd_get_16 (input_bfd, contents); |
| 950 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 951 | bfd_put_16 (input_bfd, x, contents); |
| 952 | break; |
| 953 | |
| 954 | case R_AVR_HI8_LDI_NEG: |
| 955 | contents += rel->r_offset; |
| 956 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 957 | srel = -srel; |
| 958 | srel = (srel >> 8) & 0xff; |
| 959 | x = bfd_get_16 (input_bfd, contents); |
| 960 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 961 | bfd_put_16 (input_bfd, x, contents); |
| 962 | break; |
| 963 | |
| 964 | case R_AVR_HH8_LDI_NEG: |
| 965 | contents += rel->r_offset; |
| 966 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 967 | srel = -srel; |
| 968 | srel = (srel >> 16) & 0xff; |
| 969 | x = bfd_get_16 (input_bfd, contents); |
| 970 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 971 | bfd_put_16 (input_bfd, x, contents); |
| 972 | break; |
| 973 | |
| 974 | case R_AVR_MS8_LDI_NEG: |
| 975 | contents += rel->r_offset; |
| 976 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 977 | srel = -srel; |
| 978 | srel = (srel >> 24) & 0xff; |
| 979 | x = bfd_get_16 (input_bfd, contents); |
| 980 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 981 | bfd_put_16 (input_bfd, x, contents); |
| 982 | break; |
| 983 | |
| 984 | case R_AVR_LO8_LDI_GS: |
| 985 | use_stubs = (!htab->no_stubs); |
| 986 | /* Fall through. */ |
| 987 | case R_AVR_LO8_LDI_PM: |
| 988 | contents += rel->r_offset; |
| 989 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 990 | |
| 991 | if (use_stubs |
| 992 | && avr_stub_is_required_for_16_bit_reloc (srel - base_addr)) |
| 993 | { |
| 994 | bfd_vma old_srel = srel; |
| 995 | |
| 996 | /* We need to use the address of the stub instead. */ |
| 997 | srel = avr_get_stub_addr (srel, htab); |
| 998 | if (debug_stubs) |
| 999 | printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for " |
| 1000 | "reloc at address 0x%x.\n", |
| 1001 | (unsigned int) srel, |
| 1002 | (unsigned int) old_srel, |
| 1003 | (unsigned int) reloc_addr); |
| 1004 | |
| 1005 | if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr)) |
| 1006 | return bfd_reloc_outofrange; |
| 1007 | } |
| 1008 | |
| 1009 | if (srel & 1) |
| 1010 | return bfd_reloc_outofrange; |
| 1011 | srel = srel >> 1; |
| 1012 | x = bfd_get_16 (input_bfd, contents); |
| 1013 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 1014 | bfd_put_16 (input_bfd, x, contents); |
| 1015 | break; |
| 1016 | |
| 1017 | case R_AVR_HI8_LDI_GS: |
| 1018 | use_stubs = (!htab->no_stubs); |
| 1019 | /* Fall through. */ |
| 1020 | case R_AVR_HI8_LDI_PM: |
| 1021 | contents += rel->r_offset; |
| 1022 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 1023 | |
| 1024 | if (use_stubs |
| 1025 | && avr_stub_is_required_for_16_bit_reloc (srel - base_addr)) |
| 1026 | { |
| 1027 | bfd_vma old_srel = srel; |
| 1028 | |
| 1029 | /* We need to use the address of the stub instead. */ |
| 1030 | srel = avr_get_stub_addr (srel, htab); |
| 1031 | if (debug_stubs) |
| 1032 | printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for " |
| 1033 | "reloc at address 0x%x.\n", |
| 1034 | (unsigned int) srel, |
| 1035 | (unsigned int) old_srel, |
| 1036 | (unsigned int) reloc_addr); |
| 1037 | |
| 1038 | if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr)) |
| 1039 | return bfd_reloc_outofrange; |
| 1040 | } |
| 1041 | |
| 1042 | if (srel & 1) |
| 1043 | return bfd_reloc_outofrange; |
| 1044 | srel = srel >> 1; |
| 1045 | srel = (srel >> 8) & 0xff; |
| 1046 | x = bfd_get_16 (input_bfd, contents); |
| 1047 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 1048 | bfd_put_16 (input_bfd, x, contents); |
| 1049 | break; |
| 1050 | |
| 1051 | case R_AVR_HH8_LDI_PM: |
| 1052 | contents += rel->r_offset; |
| 1053 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 1054 | if (srel & 1) |
| 1055 | return bfd_reloc_outofrange; |
| 1056 | srel = srel >> 1; |
| 1057 | srel = (srel >> 16) & 0xff; |
| 1058 | x = bfd_get_16 (input_bfd, contents); |
| 1059 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 1060 | bfd_put_16 (input_bfd, x, contents); |
| 1061 | break; |
| 1062 | |
| 1063 | case R_AVR_LO8_LDI_PM_NEG: |
| 1064 | contents += rel->r_offset; |
| 1065 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 1066 | srel = -srel; |
| 1067 | if (srel & 1) |
| 1068 | return bfd_reloc_outofrange; |
| 1069 | srel = srel >> 1; |
| 1070 | x = bfd_get_16 (input_bfd, contents); |
| 1071 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 1072 | bfd_put_16 (input_bfd, x, contents); |
| 1073 | break; |
| 1074 | |
| 1075 | case R_AVR_HI8_LDI_PM_NEG: |
| 1076 | contents += rel->r_offset; |
| 1077 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 1078 | srel = -srel; |
| 1079 | if (srel & 1) |
| 1080 | return bfd_reloc_outofrange; |
| 1081 | srel = srel >> 1; |
| 1082 | srel = (srel >> 8) & 0xff; |
| 1083 | x = bfd_get_16 (input_bfd, contents); |
| 1084 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 1085 | bfd_put_16 (input_bfd, x, contents); |
| 1086 | break; |
| 1087 | |
| 1088 | case R_AVR_HH8_LDI_PM_NEG: |
| 1089 | contents += rel->r_offset; |
| 1090 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 1091 | srel = -srel; |
| 1092 | if (srel & 1) |
| 1093 | return bfd_reloc_outofrange; |
| 1094 | srel = srel >> 1; |
| 1095 | srel = (srel >> 16) & 0xff; |
| 1096 | x = bfd_get_16 (input_bfd, contents); |
| 1097 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); |
| 1098 | bfd_put_16 (input_bfd, x, contents); |
| 1099 | break; |
| 1100 | |
| 1101 | case R_AVR_CALL: |
| 1102 | contents += rel->r_offset; |
| 1103 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 1104 | if (srel & 1) |
| 1105 | return bfd_reloc_outofrange; |
| 1106 | srel = srel >> 1; |
| 1107 | x = bfd_get_16 (input_bfd, contents); |
| 1108 | x |= ((srel & 0x10000) | ((srel << 3) & 0x1f00000)) >> 16; |
| 1109 | bfd_put_16 (input_bfd, x, contents); |
| 1110 | bfd_put_16 (input_bfd, (bfd_vma) srel & 0xffff, contents+2); |
| 1111 | break; |
| 1112 | |
| 1113 | case R_AVR_16_PM: |
| 1114 | use_stubs = (!htab->no_stubs); |
| 1115 | contents += rel->r_offset; |
| 1116 | srel = (bfd_signed_vma) relocation + rel->r_addend; |
| 1117 | |
| 1118 | if (use_stubs |
| 1119 | && avr_stub_is_required_for_16_bit_reloc (srel - base_addr)) |
| 1120 | { |
| 1121 | bfd_vma old_srel = srel; |
| 1122 | |
| 1123 | /* We need to use the address of the stub instead. */ |
| 1124 | srel = avr_get_stub_addr (srel,htab); |
| 1125 | if (debug_stubs) |
| 1126 | printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for " |
| 1127 | "reloc at address 0x%x.\n", |
| 1128 | (unsigned int) srel, |
| 1129 | (unsigned int) old_srel, |
| 1130 | (unsigned int) reloc_addr); |
| 1131 | |
| 1132 | if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr)) |
| 1133 | return bfd_reloc_outofrange; |
| 1134 | } |
| 1135 | |
| 1136 | if (srel & 1) |
| 1137 | return bfd_reloc_outofrange; |
| 1138 | srel = srel >> 1; |
| 1139 | bfd_put_16 (input_bfd, (bfd_vma) srel &0x00ffff, contents); |
| 1140 | break; |
| 1141 | |
| 1142 | default: |
| 1143 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 1144 | contents, rel->r_offset, |
| 1145 | relocation, rel->r_addend); |
| 1146 | } |
| 1147 | |
| 1148 | return r; |
| 1149 | } |
| 1150 | |
| 1151 | /* Relocate an AVR ELF section. */ |
| 1152 | |
| 1153 | static bfd_boolean |
| 1154 | elf32_avr_relocate_section (bfd *output_bfd ATTRIBUTE_UNUSED, |
| 1155 | struct bfd_link_info *info, |
| 1156 | bfd *input_bfd, |
| 1157 | asection *input_section, |
| 1158 | bfd_byte *contents, |
| 1159 | Elf_Internal_Rela *relocs, |
| 1160 | Elf_Internal_Sym *local_syms, |
| 1161 | asection **local_sections) |
| 1162 | { |
| 1163 | Elf_Internal_Shdr * symtab_hdr; |
| 1164 | struct elf_link_hash_entry ** sym_hashes; |
| 1165 | Elf_Internal_Rela * rel; |
| 1166 | Elf_Internal_Rela * relend; |
| 1167 | struct elf32_avr_link_hash_table * htab = avr_link_hash_table (info); |
| 1168 | |
| 1169 | symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; |
| 1170 | sym_hashes = elf_sym_hashes (input_bfd); |
| 1171 | relend = relocs + input_section->reloc_count; |
| 1172 | |
| 1173 | for (rel = relocs; rel < relend; rel ++) |
| 1174 | { |
| 1175 | reloc_howto_type * howto; |
| 1176 | unsigned long r_symndx; |
| 1177 | Elf_Internal_Sym * sym; |
| 1178 | asection * sec; |
| 1179 | struct elf_link_hash_entry * h; |
| 1180 | bfd_vma relocation; |
| 1181 | bfd_reloc_status_type r; |
| 1182 | const char * name; |
| 1183 | int r_type; |
| 1184 | |
| 1185 | r_type = ELF32_R_TYPE (rel->r_info); |
| 1186 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 1187 | howto = elf_avr_howto_table + ELF32_R_TYPE (rel->r_info); |
| 1188 | h = NULL; |
| 1189 | sym = NULL; |
| 1190 | sec = NULL; |
| 1191 | |
| 1192 | if (r_symndx < symtab_hdr->sh_info) |
| 1193 | { |
| 1194 | sym = local_syms + r_symndx; |
| 1195 | sec = local_sections [r_symndx]; |
| 1196 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); |
| 1197 | |
| 1198 | name = bfd_elf_string_from_elf_section |
| 1199 | (input_bfd, symtab_hdr->sh_link, sym->st_name); |
| 1200 | name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name; |
| 1201 | } |
| 1202 | else |
| 1203 | { |
| 1204 | bfd_boolean unresolved_reloc, warned; |
| 1205 | |
| 1206 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
| 1207 | r_symndx, symtab_hdr, sym_hashes, |
| 1208 | h, sec, relocation, |
| 1209 | unresolved_reloc, warned); |
| 1210 | |
| 1211 | name = h->root.root.string; |
| 1212 | } |
| 1213 | |
| 1214 | if (sec != NULL && elf_discarded_section (sec)) |
| 1215 | { |
| 1216 | /* For relocs against symbols from removed linkonce sections, |
| 1217 | or sections discarded by a linker script, we just want the |
| 1218 | section contents zeroed. Avoid any special processing. */ |
| 1219 | _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset); |
| 1220 | rel->r_info = 0; |
| 1221 | rel->r_addend = 0; |
| 1222 | continue; |
| 1223 | } |
| 1224 | |
| 1225 | if (info->relocatable) |
| 1226 | continue; |
| 1227 | |
| 1228 | r = avr_final_link_relocate (howto, input_bfd, input_section, |
| 1229 | contents, rel, relocation, htab); |
| 1230 | |
| 1231 | if (r != bfd_reloc_ok) |
| 1232 | { |
| 1233 | const char * msg = (const char *) NULL; |
| 1234 | |
| 1235 | switch (r) |
| 1236 | { |
| 1237 | case bfd_reloc_overflow: |
| 1238 | r = info->callbacks->reloc_overflow |
| 1239 | (info, (h ? &h->root : NULL), |
| 1240 | name, howto->name, (bfd_vma) 0, |
| 1241 | input_bfd, input_section, rel->r_offset); |
| 1242 | break; |
| 1243 | |
| 1244 | case bfd_reloc_undefined: |
| 1245 | r = info->callbacks->undefined_symbol |
| 1246 | (info, name, input_bfd, input_section, rel->r_offset, TRUE); |
| 1247 | break; |
| 1248 | |
| 1249 | case bfd_reloc_outofrange: |
| 1250 | msg = _("internal error: out of range error"); |
| 1251 | break; |
| 1252 | |
| 1253 | case bfd_reloc_notsupported: |
| 1254 | msg = _("internal error: unsupported relocation error"); |
| 1255 | break; |
| 1256 | |
| 1257 | case bfd_reloc_dangerous: |
| 1258 | msg = _("internal error: dangerous relocation"); |
| 1259 | break; |
| 1260 | |
| 1261 | default: |
| 1262 | msg = _("internal error: unknown error"); |
| 1263 | break; |
| 1264 | } |
| 1265 | |
| 1266 | if (msg) |
| 1267 | r = info->callbacks->warning |
| 1268 | (info, msg, name, input_bfd, input_section, rel->r_offset); |
| 1269 | |
| 1270 | if (! r) |
| 1271 | return FALSE; |
| 1272 | } |
| 1273 | } |
| 1274 | |
| 1275 | return TRUE; |
| 1276 | } |
| 1277 | |
| 1278 | /* The final processing done just before writing out a AVR ELF object |
| 1279 | file. This gets the AVR architecture right based on the machine |
| 1280 | number. */ |
| 1281 | |
| 1282 | static void |
| 1283 | bfd_elf_avr_final_write_processing (bfd *abfd, |
| 1284 | bfd_boolean linker ATTRIBUTE_UNUSED) |
| 1285 | { |
| 1286 | unsigned long val; |
| 1287 | |
| 1288 | switch (bfd_get_mach (abfd)) |
| 1289 | { |
| 1290 | default: |
| 1291 | case bfd_mach_avr2: |
| 1292 | val = E_AVR_MACH_AVR2; |
| 1293 | break; |
| 1294 | |
| 1295 | case bfd_mach_avr1: |
| 1296 | val = E_AVR_MACH_AVR1; |
| 1297 | break; |
| 1298 | |
| 1299 | case bfd_mach_avr25: |
| 1300 | val = E_AVR_MACH_AVR25; |
| 1301 | |
| 1302 | case bfd_mach_avr3: |
| 1303 | val = E_AVR_MACH_AVR3; |
| 1304 | break; |
| 1305 | |
| 1306 | case bfd_mach_avr31: |
| 1307 | val = E_AVR_MACH_AVR31; |
| 1308 | |
| 1309 | case bfd_mach_avr35: |
| 1310 | val = E_AVR_MACH_AVR35; |
| 1311 | |
| 1312 | case bfd_mach_avr4: |
| 1313 | val = E_AVR_MACH_AVR4; |
| 1314 | break; |
| 1315 | |
| 1316 | case bfd_mach_avr5: |
| 1317 | val = E_AVR_MACH_AVR5; |
| 1318 | break; |
| 1319 | |
| 1320 | case bfd_mach_avr51: |
| 1321 | val = E_AVR_MACH_AVR51; |
| 1322 | break; |
| 1323 | |
| 1324 | case bfd_mach_avr6: |
| 1325 | val = E_AVR_MACH_AVR6; |
| 1326 | break; |
| 1327 | } |
| 1328 | |
| 1329 | elf_elfheader (abfd)->e_machine = EM_AVR; |
| 1330 | elf_elfheader (abfd)->e_flags &= ~ EF_AVR_MACH; |
| 1331 | elf_elfheader (abfd)->e_flags |= val; |
| 1332 | elf_elfheader (abfd)->e_flags |= EF_AVR_LINKRELAX_PREPARED; |
| 1333 | } |
| 1334 | |
| 1335 | /* Set the right machine number. */ |
| 1336 | |
| 1337 | static bfd_boolean |
| 1338 | elf32_avr_object_p (bfd *abfd) |
| 1339 | { |
| 1340 | unsigned int e_set = bfd_mach_avr2; |
| 1341 | |
| 1342 | if (elf_elfheader (abfd)->e_machine == EM_AVR |
| 1343 | || elf_elfheader (abfd)->e_machine == EM_AVR_OLD) |
| 1344 | { |
| 1345 | int e_mach = elf_elfheader (abfd)->e_flags & EF_AVR_MACH; |
| 1346 | |
| 1347 | switch (e_mach) |
| 1348 | { |
| 1349 | default: |
| 1350 | case E_AVR_MACH_AVR2: |
| 1351 | e_set = bfd_mach_avr2; |
| 1352 | break; |
| 1353 | |
| 1354 | case E_AVR_MACH_AVR1: |
| 1355 | e_set = bfd_mach_avr1; |
| 1356 | break; |
| 1357 | |
| 1358 | case E_AVR_MACH_AVR25: |
| 1359 | e_set = bfd_mach_avr25; |
| 1360 | break; |
| 1361 | |
| 1362 | case E_AVR_MACH_AVR3: |
| 1363 | e_set = bfd_mach_avr3; |
| 1364 | break; |
| 1365 | |
| 1366 | case E_AVR_MACH_AVR31: |
| 1367 | e_set = bfd_mach_avr31; |
| 1368 | break; |
| 1369 | |
| 1370 | case E_AVR_MACH_AVR35: |
| 1371 | e_set = bfd_mach_avr35; |
| 1372 | break; |
| 1373 | |
| 1374 | case E_AVR_MACH_AVR4: |
| 1375 | e_set = bfd_mach_avr4; |
| 1376 | break; |
| 1377 | |
| 1378 | case E_AVR_MACH_AVR5: |
| 1379 | e_set = bfd_mach_avr5; |
| 1380 | break; |
| 1381 | |
| 1382 | case E_AVR_MACH_AVR51: |
| 1383 | e_set = bfd_mach_avr51; |
| 1384 | break; |
| 1385 | |
| 1386 | case E_AVR_MACH_AVR6: |
| 1387 | e_set = bfd_mach_avr6; |
| 1388 | break; |
| 1389 | } |
| 1390 | } |
| 1391 | return bfd_default_set_arch_mach (abfd, bfd_arch_avr, |
| 1392 | e_set); |
| 1393 | } |
| 1394 | |
| 1395 | |
| 1396 | /* Delete some bytes from a section while changing the size of an instruction. |
| 1397 | The parameter "addr" denotes the section-relative offset pointing just |
| 1398 | behind the shrinked instruction. "addr+count" point at the first |
| 1399 | byte just behind the original unshrinked instruction. */ |
| 1400 | |
| 1401 | static bfd_boolean |
| 1402 | elf32_avr_relax_delete_bytes (bfd *abfd, |
| 1403 | asection *sec, |
| 1404 | bfd_vma addr, |
| 1405 | int count) |
| 1406 | { |
| 1407 | Elf_Internal_Shdr *symtab_hdr; |
| 1408 | unsigned int sec_shndx; |
| 1409 | bfd_byte *contents; |
| 1410 | Elf_Internal_Rela *irel, *irelend; |
| 1411 | Elf_Internal_Rela *irelalign; |
| 1412 | Elf_Internal_Sym *isym; |
| 1413 | Elf_Internal_Sym *isymbuf = NULL; |
| 1414 | Elf_Internal_Sym *isymend; |
| 1415 | bfd_vma toaddr; |
| 1416 | struct elf_link_hash_entry **sym_hashes; |
| 1417 | struct elf_link_hash_entry **end_hashes; |
| 1418 | unsigned int symcount; |
| 1419 | |
| 1420 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 1421 | sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); |
| 1422 | contents = elf_section_data (sec)->this_hdr.contents; |
| 1423 | |
| 1424 | /* The deletion must stop at the next ALIGN reloc for an aligment |
| 1425 | power larger than the number of bytes we are deleting. */ |
| 1426 | |
| 1427 | irelalign = NULL; |
| 1428 | toaddr = sec->size; |
| 1429 | |
| 1430 | irel = elf_section_data (sec)->relocs; |
| 1431 | irelend = irel + sec->reloc_count; |
| 1432 | |
| 1433 | /* Actually delete the bytes. */ |
| 1434 | if (toaddr - addr - count > 0) |
| 1435 | memmove (contents + addr, contents + addr + count, |
| 1436 | (size_t) (toaddr - addr - count)); |
| 1437 | sec->size -= count; |
| 1438 | |
| 1439 | /* Adjust all the reloc addresses. */ |
| 1440 | for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++) |
| 1441 | { |
| 1442 | bfd_vma old_reloc_address; |
| 1443 | bfd_vma shrinked_insn_address; |
| 1444 | |
| 1445 | old_reloc_address = (sec->output_section->vma |
| 1446 | + sec->output_offset + irel->r_offset); |
| 1447 | shrinked_insn_address = (sec->output_section->vma |
| 1448 | + sec->output_offset + addr - count); |
| 1449 | |
| 1450 | /* Get the new reloc address. */ |
| 1451 | if ((irel->r_offset > addr |
| 1452 | && irel->r_offset < toaddr)) |
| 1453 | { |
| 1454 | if (debug_relax) |
| 1455 | printf ("Relocation at address 0x%x needs to be moved.\n" |
| 1456 | "Old section offset: 0x%x, New section offset: 0x%x \n", |
| 1457 | (unsigned int) old_reloc_address, |
| 1458 | (unsigned int) irel->r_offset, |
| 1459 | (unsigned int) ((irel->r_offset) - count)); |
| 1460 | |
| 1461 | irel->r_offset -= count; |
| 1462 | } |
| 1463 | |
| 1464 | } |
| 1465 | |
| 1466 | /* The reloc's own addresses are now ok. However, we need to readjust |
| 1467 | the reloc's addend, i.e. the reloc's value if two conditions are met: |
| 1468 | 1.) the reloc is relative to a symbol in this section that |
| 1469 | is located in front of the shrinked instruction |
| 1470 | 2.) symbol plus addend end up behind the shrinked instruction. |
| 1471 | |
| 1472 | The most common case where this happens are relocs relative to |
| 1473 | the section-start symbol. |
| 1474 | |
| 1475 | This step needs to be done for all of the sections of the bfd. */ |
| 1476 | |
| 1477 | { |
| 1478 | struct bfd_section *isec; |
| 1479 | |
| 1480 | for (isec = abfd->sections; isec; isec = isec->next) |
| 1481 | { |
| 1482 | bfd_vma symval; |
| 1483 | bfd_vma shrinked_insn_address; |
| 1484 | |
| 1485 | shrinked_insn_address = (sec->output_section->vma |
| 1486 | + sec->output_offset + addr - count); |
| 1487 | |
| 1488 | irelend = elf_section_data (isec)->relocs + isec->reloc_count; |
| 1489 | for (irel = elf_section_data (isec)->relocs; |
| 1490 | irel < irelend; |
| 1491 | irel++) |
| 1492 | { |
| 1493 | /* Read this BFD's local symbols if we haven't done |
| 1494 | so already. */ |
| 1495 | if (isymbuf == NULL && symtab_hdr->sh_info != 0) |
| 1496 | { |
| 1497 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 1498 | if (isymbuf == NULL) |
| 1499 | isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, |
| 1500 | symtab_hdr->sh_info, 0, |
| 1501 | NULL, NULL, NULL); |
| 1502 | if (isymbuf == NULL) |
| 1503 | return FALSE; |
| 1504 | } |
| 1505 | |
| 1506 | /* Get the value of the symbol referred to by the reloc. */ |
| 1507 | if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) |
| 1508 | { |
| 1509 | /* A local symbol. */ |
| 1510 | Elf_Internal_Sym *isym; |
| 1511 | asection *sym_sec; |
| 1512 | |
| 1513 | isym = isymbuf + ELF32_R_SYM (irel->r_info); |
| 1514 | sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| 1515 | symval = isym->st_value; |
| 1516 | /* If the reloc is absolute, it will not have |
| 1517 | a symbol or section associated with it. */ |
| 1518 | if (sym_sec == sec) |
| 1519 | { |
| 1520 | symval += sym_sec->output_section->vma |
| 1521 | + sym_sec->output_offset; |
| 1522 | |
| 1523 | if (debug_relax) |
| 1524 | printf ("Checking if the relocation's " |
| 1525 | "addend needs corrections.\n" |
| 1526 | "Address of anchor symbol: 0x%x \n" |
| 1527 | "Address of relocation target: 0x%x \n" |
| 1528 | "Address of relaxed insn: 0x%x \n", |
| 1529 | (unsigned int) symval, |
| 1530 | (unsigned int) (symval + irel->r_addend), |
| 1531 | (unsigned int) shrinked_insn_address); |
| 1532 | |
| 1533 | if (symval <= shrinked_insn_address |
| 1534 | && (symval + irel->r_addend) > shrinked_insn_address) |
| 1535 | { |
| 1536 | irel->r_addend -= count; |
| 1537 | |
| 1538 | if (debug_relax) |
| 1539 | printf ("Relocation's addend needed to be fixed \n"); |
| 1540 | } |
| 1541 | } |
| 1542 | /* else...Reference symbol is absolute. No adjustment needed. */ |
| 1543 | } |
| 1544 | /* else...Reference symbol is extern. No need for adjusting |
| 1545 | the addend. */ |
| 1546 | } |
| 1547 | } |
| 1548 | } |
| 1549 | |
| 1550 | /* Adjust the local symbols defined in this section. */ |
| 1551 | isym = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 1552 | isymend = isym + symtab_hdr->sh_info; |
| 1553 | for (; isym < isymend; isym++) |
| 1554 | { |
| 1555 | if (isym->st_shndx == sec_shndx |
| 1556 | && isym->st_value > addr |
| 1557 | && isym->st_value < toaddr) |
| 1558 | isym->st_value -= count; |
| 1559 | } |
| 1560 | |
| 1561 | /* Now adjust the global symbols defined in this section. */ |
| 1562 | symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) |
| 1563 | - symtab_hdr->sh_info); |
| 1564 | sym_hashes = elf_sym_hashes (abfd); |
| 1565 | end_hashes = sym_hashes + symcount; |
| 1566 | for (; sym_hashes < end_hashes; sym_hashes++) |
| 1567 | { |
| 1568 | struct elf_link_hash_entry *sym_hash = *sym_hashes; |
| 1569 | if ((sym_hash->root.type == bfd_link_hash_defined |
| 1570 | || sym_hash->root.type == bfd_link_hash_defweak) |
| 1571 | && sym_hash->root.u.def.section == sec |
| 1572 | && sym_hash->root.u.def.value > addr |
| 1573 | && sym_hash->root.u.def.value < toaddr) |
| 1574 | { |
| 1575 | sym_hash->root.u.def.value -= count; |
| 1576 | } |
| 1577 | } |
| 1578 | |
| 1579 | return TRUE; |
| 1580 | } |
| 1581 | |
| 1582 | /* This function handles relaxing for the avr. |
| 1583 | Many important relaxing opportunities within functions are already |
| 1584 | realized by the compiler itself. |
| 1585 | Here we try to replace call (4 bytes) -> rcall (2 bytes) |
| 1586 | and jump -> rjmp (safes also 2 bytes). |
| 1587 | As well we now optimize seqences of |
| 1588 | - call/rcall function |
| 1589 | - ret |
| 1590 | to yield |
| 1591 | - jmp/rjmp function |
| 1592 | - ret |
| 1593 | . In case that within a sequence |
| 1594 | - jmp/rjmp label |
| 1595 | - ret |
| 1596 | the ret could no longer be reached it is optimized away. In order |
| 1597 | to check if the ret is no longer needed, it is checked that the ret's address |
| 1598 | is not the target of a branch or jump within the same section, it is checked |
| 1599 | that there is no skip instruction before the jmp/rjmp and that there |
| 1600 | is no local or global label place at the address of the ret. |
| 1601 | |
| 1602 | We refrain from relaxing within sections ".vectors" and |
| 1603 | ".jumptables" in order to maintain the position of the instructions. |
| 1604 | There, however, we substitute jmp/call by a sequence rjmp,nop/rcall,nop |
| 1605 | if possible. (In future one could possibly use the space of the nop |
| 1606 | for the first instruction of the irq service function. |
| 1607 | |
| 1608 | The .jumptables sections is meant to be used for a future tablejump variant |
| 1609 | for the devices with 3-byte program counter where the table itself |
| 1610 | contains 4-byte jump instructions whose relative offset must not |
| 1611 | be changed. */ |
| 1612 | |
| 1613 | static bfd_boolean |
| 1614 | elf32_avr_relax_section (bfd *abfd, |
| 1615 | asection *sec, |
| 1616 | struct bfd_link_info *link_info, |
| 1617 | bfd_boolean *again) |
| 1618 | { |
| 1619 | Elf_Internal_Shdr *symtab_hdr; |
| 1620 | Elf_Internal_Rela *internal_relocs; |
| 1621 | Elf_Internal_Rela *irel, *irelend; |
| 1622 | bfd_byte *contents = NULL; |
| 1623 | Elf_Internal_Sym *isymbuf = NULL; |
| 1624 | static asection *last_input_section = NULL; |
| 1625 | static Elf_Internal_Rela *last_reloc = NULL; |
| 1626 | struct elf32_avr_link_hash_table *htab; |
| 1627 | |
| 1628 | htab = avr_link_hash_table (link_info); |
| 1629 | if (htab == NULL) |
| 1630 | return FALSE; |
| 1631 | |
| 1632 | /* Assume nothing changes. */ |
| 1633 | *again = FALSE; |
| 1634 | |
| 1635 | if ((!htab->no_stubs) && (sec == htab->stub_sec)) |
| 1636 | { |
| 1637 | /* We are just relaxing the stub section. |
| 1638 | Let's calculate the size needed again. */ |
| 1639 | bfd_size_type last_estimated_stub_section_size = htab->stub_sec->size; |
| 1640 | |
| 1641 | if (debug_relax) |
| 1642 | printf ("Relaxing the stub section. Size prior to this pass: %i\n", |
| 1643 | (int) last_estimated_stub_section_size); |
| 1644 | |
| 1645 | elf32_avr_size_stubs (htab->stub_sec->output_section->owner, |
| 1646 | link_info, FALSE); |
| 1647 | |
| 1648 | /* Check if the number of trampolines changed. */ |
| 1649 | if (last_estimated_stub_section_size != htab->stub_sec->size) |
| 1650 | *again = TRUE; |
| 1651 | |
| 1652 | if (debug_relax) |
| 1653 | printf ("Size of stub section after this pass: %i\n", |
| 1654 | (int) htab->stub_sec->size); |
| 1655 | |
| 1656 | return TRUE; |
| 1657 | } |
| 1658 | |
| 1659 | /* We don't have to do anything for a relocatable link, if |
| 1660 | this section does not have relocs, or if this is not a |
| 1661 | code section. */ |
| 1662 | if (link_info->relocatable |
| 1663 | || (sec->flags & SEC_RELOC) == 0 |
| 1664 | || sec->reloc_count == 0 |
| 1665 | || (sec->flags & SEC_CODE) == 0) |
| 1666 | return TRUE; |
| 1667 | |
| 1668 | /* Check if the object file to relax uses internal symbols so that we |
| 1669 | could fix up the relocations. */ |
| 1670 | if (!(elf_elfheader (abfd)->e_flags & EF_AVR_LINKRELAX_PREPARED)) |
| 1671 | return TRUE; |
| 1672 | |
| 1673 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 1674 | |
| 1675 | /* Get a copy of the native relocations. */ |
| 1676 | internal_relocs = (_bfd_elf_link_read_relocs |
| 1677 | (abfd, sec, NULL, NULL, link_info->keep_memory)); |
| 1678 | if (internal_relocs == NULL) |
| 1679 | goto error_return; |
| 1680 | |
| 1681 | if (sec != last_input_section) |
| 1682 | last_reloc = NULL; |
| 1683 | |
| 1684 | last_input_section = sec; |
| 1685 | |
| 1686 | /* Walk through the relocs looking for relaxing opportunities. */ |
| 1687 | irelend = internal_relocs + sec->reloc_count; |
| 1688 | for (irel = internal_relocs; irel < irelend; irel++) |
| 1689 | { |
| 1690 | bfd_vma symval; |
| 1691 | |
| 1692 | if ( ELF32_R_TYPE (irel->r_info) != R_AVR_13_PCREL |
| 1693 | && ELF32_R_TYPE (irel->r_info) != R_AVR_7_PCREL |
| 1694 | && ELF32_R_TYPE (irel->r_info) != R_AVR_CALL) |
| 1695 | continue; |
| 1696 | |
| 1697 | /* Get the section contents if we haven't done so already. */ |
| 1698 | if (contents == NULL) |
| 1699 | { |
| 1700 | /* Get cached copy if it exists. */ |
| 1701 | if (elf_section_data (sec)->this_hdr.contents != NULL) |
| 1702 | contents = elf_section_data (sec)->this_hdr.contents; |
| 1703 | else |
| 1704 | { |
| 1705 | /* Go get them off disk. */ |
| 1706 | if (! bfd_malloc_and_get_section (abfd, sec, &contents)) |
| 1707 | goto error_return; |
| 1708 | } |
| 1709 | } |
| 1710 | |
| 1711 | /* Read this BFD's local symbols if we haven't done so already. */ |
| 1712 | if (isymbuf == NULL && symtab_hdr->sh_info != 0) |
| 1713 | { |
| 1714 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 1715 | if (isymbuf == NULL) |
| 1716 | isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, |
| 1717 | symtab_hdr->sh_info, 0, |
| 1718 | NULL, NULL, NULL); |
| 1719 | if (isymbuf == NULL) |
| 1720 | goto error_return; |
| 1721 | } |
| 1722 | |
| 1723 | |
| 1724 | /* Get the value of the symbol referred to by the reloc. */ |
| 1725 | if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) |
| 1726 | { |
| 1727 | /* A local symbol. */ |
| 1728 | Elf_Internal_Sym *isym; |
| 1729 | asection *sym_sec; |
| 1730 | |
| 1731 | isym = isymbuf + ELF32_R_SYM (irel->r_info); |
| 1732 | sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| 1733 | symval = isym->st_value; |
| 1734 | /* If the reloc is absolute, it will not have |
| 1735 | a symbol or section associated with it. */ |
| 1736 | if (sym_sec) |
| 1737 | symval += sym_sec->output_section->vma |
| 1738 | + sym_sec->output_offset; |
| 1739 | } |
| 1740 | else |
| 1741 | { |
| 1742 | unsigned long indx; |
| 1743 | struct elf_link_hash_entry *h; |
| 1744 | |
| 1745 | /* An external symbol. */ |
| 1746 | indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; |
| 1747 | h = elf_sym_hashes (abfd)[indx]; |
| 1748 | BFD_ASSERT (h != NULL); |
| 1749 | if (h->root.type != bfd_link_hash_defined |
| 1750 | && h->root.type != bfd_link_hash_defweak) |
| 1751 | /* This appears to be a reference to an undefined |
| 1752 | symbol. Just ignore it--it will be caught by the |
| 1753 | regular reloc processing. */ |
| 1754 | continue; |
| 1755 | |
| 1756 | symval = (h->root.u.def.value |
| 1757 | + h->root.u.def.section->output_section->vma |
| 1758 | + h->root.u.def.section->output_offset); |
| 1759 | } |
| 1760 | |
| 1761 | /* For simplicity of coding, we are going to modify the section |
| 1762 | contents, the section relocs, and the BFD symbol table. We |
| 1763 | must tell the rest of the code not to free up this |
| 1764 | information. It would be possible to instead create a table |
| 1765 | of changes which have to be made, as is done in coff-mips.c; |
| 1766 | that would be more work, but would require less memory when |
| 1767 | the linker is run. */ |
| 1768 | switch (ELF32_R_TYPE (irel->r_info)) |
| 1769 | { |
| 1770 | /* Try to turn a 22-bit absolute call/jump into an 13-bit |
| 1771 | pc-relative rcall/rjmp. */ |
| 1772 | case R_AVR_CALL: |
| 1773 | { |
| 1774 | bfd_vma value = symval + irel->r_addend; |
| 1775 | bfd_vma dot, gap; |
| 1776 | int distance_short_enough = 0; |
| 1777 | |
| 1778 | /* Get the address of this instruction. */ |
| 1779 | dot = (sec->output_section->vma |
| 1780 | + sec->output_offset + irel->r_offset); |
| 1781 | |
| 1782 | /* Compute the distance from this insn to the branch target. */ |
| 1783 | gap = value - dot; |
| 1784 | |
| 1785 | /* If the distance is within -4094..+4098 inclusive, then we can |
| 1786 | relax this jump/call. +4098 because the call/jump target |
| 1787 | will be closer after the relaxation. */ |
| 1788 | if ((int) gap >= -4094 && (int) gap <= 4098) |
| 1789 | distance_short_enough = 1; |
| 1790 | |
| 1791 | /* Here we handle the wrap-around case. E.g. for a 16k device |
| 1792 | we could use a rjmp to jump from address 0x100 to 0x3d00! |
| 1793 | In order to make this work properly, we need to fill the |
| 1794 | vaiable avr_pc_wrap_around with the appropriate value. |
| 1795 | I.e. 0x4000 for a 16k device. */ |
| 1796 | { |
| 1797 | /* Shrinking the code size makes the gaps larger in the |
| 1798 | case of wrap-arounds. So we use a heuristical safety |
| 1799 | margin to avoid that during relax the distance gets |
| 1800 | again too large for the short jumps. Let's assume |
| 1801 | a typical code-size reduction due to relax for a |
| 1802 | 16k device of 600 bytes. So let's use twice the |
| 1803 | typical value as safety margin. */ |
| 1804 | int rgap; |
| 1805 | int safety_margin; |
| 1806 | |
| 1807 | int assumed_shrink = 600; |
| 1808 | if (avr_pc_wrap_around > 0x4000) |
| 1809 | assumed_shrink = 900; |
| 1810 | |
| 1811 | safety_margin = 2 * assumed_shrink; |
| 1812 | |
| 1813 | rgap = avr_relative_distance_considering_wrap_around (gap); |
| 1814 | |
| 1815 | if (rgap >= (-4092 + safety_margin) |
| 1816 | && rgap <= (4094 - safety_margin)) |
| 1817 | distance_short_enough = 1; |
| 1818 | } |
| 1819 | |
| 1820 | if (distance_short_enough) |
| 1821 | { |
| 1822 | unsigned char code_msb; |
| 1823 | unsigned char code_lsb; |
| 1824 | |
| 1825 | if (debug_relax) |
| 1826 | printf ("shrinking jump/call instruction at address 0x%x" |
| 1827 | " in section %s\n\n", |
| 1828 | (int) dot, sec->name); |
| 1829 | |
| 1830 | /* Note that we've changed the relocs, section contents, |
| 1831 | etc. */ |
| 1832 | elf_section_data (sec)->relocs = internal_relocs; |
| 1833 | elf_section_data (sec)->this_hdr.contents = contents; |
| 1834 | symtab_hdr->contents = (unsigned char *) isymbuf; |
| 1835 | |
| 1836 | /* Get the instruction code for relaxing. */ |
| 1837 | code_lsb = bfd_get_8 (abfd, contents + irel->r_offset); |
| 1838 | code_msb = bfd_get_8 (abfd, contents + irel->r_offset + 1); |
| 1839 | |
| 1840 | /* Mask out the relocation bits. */ |
| 1841 | code_msb &= 0x94; |
| 1842 | code_lsb &= 0x0E; |
| 1843 | if (code_msb == 0x94 && code_lsb == 0x0E) |
| 1844 | { |
| 1845 | /* we are changing call -> rcall . */ |
| 1846 | bfd_put_8 (abfd, 0x00, contents + irel->r_offset); |
| 1847 | bfd_put_8 (abfd, 0xD0, contents + irel->r_offset + 1); |
| 1848 | } |
| 1849 | else if (code_msb == 0x94 && code_lsb == 0x0C) |
| 1850 | { |
| 1851 | /* we are changeing jump -> rjmp. */ |
| 1852 | bfd_put_8 (abfd, 0x00, contents + irel->r_offset); |
| 1853 | bfd_put_8 (abfd, 0xC0, contents + irel->r_offset + 1); |
| 1854 | } |
| 1855 | else |
| 1856 | abort (); |
| 1857 | |
| 1858 | /* Fix the relocation's type. */ |
| 1859 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| 1860 | R_AVR_13_PCREL); |
| 1861 | |
| 1862 | /* Check for the vector section. There we don't want to |
| 1863 | modify the ordering! */ |
| 1864 | |
| 1865 | if (!strcmp (sec->name,".vectors") |
| 1866 | || !strcmp (sec->name,".jumptables")) |
| 1867 | { |
| 1868 | /* Let's insert a nop. */ |
| 1869 | bfd_put_8 (abfd, 0x00, contents + irel->r_offset + 2); |
| 1870 | bfd_put_8 (abfd, 0x00, contents + irel->r_offset + 3); |
| 1871 | } |
| 1872 | else |
| 1873 | { |
| 1874 | /* Delete two bytes of data. */ |
| 1875 | if (!elf32_avr_relax_delete_bytes (abfd, sec, |
| 1876 | irel->r_offset + 2, 2)) |
| 1877 | goto error_return; |
| 1878 | |
| 1879 | /* That will change things, so, we should relax again. |
| 1880 | Note that this is not required, and it may be slow. */ |
| 1881 | *again = TRUE; |
| 1882 | } |
| 1883 | } |
| 1884 | } |
| 1885 | |
| 1886 | default: |
| 1887 | { |
| 1888 | unsigned char code_msb; |
| 1889 | unsigned char code_lsb; |
| 1890 | bfd_vma dot; |
| 1891 | |
| 1892 | code_msb = bfd_get_8 (abfd, contents + irel->r_offset + 1); |
| 1893 | code_lsb = bfd_get_8 (abfd, contents + irel->r_offset + 0); |
| 1894 | |
| 1895 | /* Get the address of this instruction. */ |
| 1896 | dot = (sec->output_section->vma |
| 1897 | + sec->output_offset + irel->r_offset); |
| 1898 | |
| 1899 | /* Here we look for rcall/ret or call/ret sequences that could be |
| 1900 | safely replaced by rjmp/ret or jmp/ret. */ |
| 1901 | if (((code_msb & 0xf0) == 0xd0) |
| 1902 | && avr_replace_call_ret_sequences) |
| 1903 | { |
| 1904 | /* This insn is a rcall. */ |
| 1905 | unsigned char next_insn_msb = 0; |
| 1906 | unsigned char next_insn_lsb = 0; |
| 1907 | |
| 1908 | if (irel->r_offset + 3 < sec->size) |
| 1909 | { |
| 1910 | next_insn_msb = |
| 1911 | bfd_get_8 (abfd, contents + irel->r_offset + 3); |
| 1912 | next_insn_lsb = |
| 1913 | bfd_get_8 (abfd, contents + irel->r_offset + 2); |
| 1914 | } |
| 1915 | |
| 1916 | if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb)) |
| 1917 | { |
| 1918 | /* The next insn is a ret. We now convert the rcall insn |
| 1919 | into a rjmp instruction. */ |
| 1920 | code_msb &= 0xef; |
| 1921 | bfd_put_8 (abfd, code_msb, contents + irel->r_offset + 1); |
| 1922 | if (debug_relax) |
| 1923 | printf ("converted rcall/ret sequence at address 0x%x" |
| 1924 | " into rjmp/ret sequence. Section is %s\n\n", |
| 1925 | (int) dot, sec->name); |
| 1926 | *again = TRUE; |
| 1927 | break; |
| 1928 | } |
| 1929 | } |
| 1930 | else if ((0x94 == (code_msb & 0xfe)) |
| 1931 | && (0x0e == (code_lsb & 0x0e)) |
| 1932 | && avr_replace_call_ret_sequences) |
| 1933 | { |
| 1934 | /* This insn is a call. */ |
| 1935 | unsigned char next_insn_msb = 0; |
| 1936 | unsigned char next_insn_lsb = 0; |
| 1937 | |
| 1938 | if (irel->r_offset + 5 < sec->size) |
| 1939 | { |
| 1940 | next_insn_msb = |
| 1941 | bfd_get_8 (abfd, contents + irel->r_offset + 5); |
| 1942 | next_insn_lsb = |
| 1943 | bfd_get_8 (abfd, contents + irel->r_offset + 4); |
| 1944 | } |
| 1945 | |
| 1946 | if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb)) |
| 1947 | { |
| 1948 | /* The next insn is a ret. We now convert the call insn |
| 1949 | into a jmp instruction. */ |
| 1950 | |
| 1951 | code_lsb &= 0xfd; |
| 1952 | bfd_put_8 (abfd, code_lsb, contents + irel->r_offset); |
| 1953 | if (debug_relax) |
| 1954 | printf ("converted call/ret sequence at address 0x%x" |
| 1955 | " into jmp/ret sequence. Section is %s\n\n", |
| 1956 | (int) dot, sec->name); |
| 1957 | *again = TRUE; |
| 1958 | break; |
| 1959 | } |
| 1960 | } |
| 1961 | else if ((0xc0 == (code_msb & 0xf0)) |
| 1962 | || ((0x94 == (code_msb & 0xfe)) |
| 1963 | && (0x0c == (code_lsb & 0x0e)))) |
| 1964 | { |
| 1965 | /* This insn is a rjmp or a jmp. */ |
| 1966 | unsigned char next_insn_msb = 0; |
| 1967 | unsigned char next_insn_lsb = 0; |
| 1968 | int insn_size; |
| 1969 | |
| 1970 | if (0xc0 == (code_msb & 0xf0)) |
| 1971 | insn_size = 2; /* rjmp insn */ |
| 1972 | else |
| 1973 | insn_size = 4; /* jmp insn */ |
| 1974 | |
| 1975 | if (irel->r_offset + insn_size + 1 < sec->size) |
| 1976 | { |
| 1977 | next_insn_msb = |
| 1978 | bfd_get_8 (abfd, contents + irel->r_offset |
| 1979 | + insn_size + 1); |
| 1980 | next_insn_lsb = |
| 1981 | bfd_get_8 (abfd, contents + irel->r_offset |
| 1982 | + insn_size); |
| 1983 | } |
| 1984 | |
| 1985 | if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb)) |
| 1986 | { |
| 1987 | /* The next insn is a ret. We possibly could delete |
| 1988 | this ret. First we need to check for preceeding |
| 1989 | sbis/sbic/sbrs or cpse "skip" instructions. */ |
| 1990 | |
| 1991 | int there_is_preceeding_non_skip_insn = 1; |
| 1992 | bfd_vma address_of_ret; |
| 1993 | |
| 1994 | address_of_ret = dot + insn_size; |
| 1995 | |
| 1996 | if (debug_relax && (insn_size == 2)) |
| 1997 | printf ("found rjmp / ret sequence at address 0x%x\n", |
| 1998 | (int) dot); |
| 1999 | if (debug_relax && (insn_size == 4)) |
| 2000 | printf ("found jmp / ret sequence at address 0x%x\n", |
| 2001 | (int) dot); |
| 2002 | |
| 2003 | /* We have to make sure that there is a preceeding insn. */ |
| 2004 | if (irel->r_offset >= 2) |
| 2005 | { |
| 2006 | unsigned char preceeding_msb; |
| 2007 | unsigned char preceeding_lsb; |
| 2008 | preceeding_msb = |
| 2009 | bfd_get_8 (abfd, contents + irel->r_offset - 1); |
| 2010 | preceeding_lsb = |
| 2011 | bfd_get_8 (abfd, contents + irel->r_offset - 2); |
| 2012 | |
| 2013 | /* sbic. */ |
| 2014 | if (0x99 == preceeding_msb) |
| 2015 | there_is_preceeding_non_skip_insn = 0; |
| 2016 | |
| 2017 | /* sbis. */ |
| 2018 | if (0x9b == preceeding_msb) |
| 2019 | there_is_preceeding_non_skip_insn = 0; |
| 2020 | |
| 2021 | /* sbrc */ |
| 2022 | if ((0xfc == (preceeding_msb & 0xfe) |
| 2023 | && (0x00 == (preceeding_lsb & 0x08)))) |
| 2024 | there_is_preceeding_non_skip_insn = 0; |
| 2025 | |
| 2026 | /* sbrs */ |
| 2027 | if ((0xfe == (preceeding_msb & 0xfe) |
| 2028 | && (0x00 == (preceeding_lsb & 0x08)))) |
| 2029 | there_is_preceeding_non_skip_insn = 0; |
| 2030 | |
| 2031 | /* cpse */ |
| 2032 | if (0x10 == (preceeding_msb & 0xfc)) |
| 2033 | there_is_preceeding_non_skip_insn = 0; |
| 2034 | |
| 2035 | if (there_is_preceeding_non_skip_insn == 0) |
| 2036 | if (debug_relax) |
| 2037 | printf ("preceeding skip insn prevents deletion of" |
| 2038 | " ret insn at addr 0x%x in section %s\n", |
| 2039 | (int) dot + 2, sec->name); |
| 2040 | } |
| 2041 | else |
| 2042 | { |
| 2043 | /* There is no previous instruction. */ |
| 2044 | there_is_preceeding_non_skip_insn = 0; |
| 2045 | } |
| 2046 | |
| 2047 | if (there_is_preceeding_non_skip_insn) |
| 2048 | { |
| 2049 | /* We now only have to make sure that there is no |
| 2050 | local label defined at the address of the ret |
| 2051 | instruction and that there is no local relocation |
| 2052 | in this section pointing to the ret. */ |
| 2053 | |
| 2054 | int deleting_ret_is_safe = 1; |
| 2055 | unsigned int section_offset_of_ret_insn = |
| 2056 | irel->r_offset + insn_size; |
| 2057 | Elf_Internal_Sym *isym, *isymend; |
| 2058 | unsigned int sec_shndx; |
| 2059 | |
| 2060 | sec_shndx = |
| 2061 | _bfd_elf_section_from_bfd_section (abfd, sec); |
| 2062 | |
| 2063 | /* Check for local symbols. */ |
| 2064 | isym = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 2065 | isymend = isym + symtab_hdr->sh_info; |
| 2066 | /* PR 6019: There may not be any local symbols. */ |
| 2067 | for (; isym != NULL && isym < isymend; isym++) |
| 2068 | { |
| 2069 | if (isym->st_value == section_offset_of_ret_insn |
| 2070 | && isym->st_shndx == sec_shndx) |
| 2071 | { |
| 2072 | deleting_ret_is_safe = 0; |
| 2073 | if (debug_relax) |
| 2074 | printf ("local label prevents deletion of ret " |
| 2075 | "insn at address 0x%x\n", |
| 2076 | (int) dot + insn_size); |
| 2077 | } |
| 2078 | } |
| 2079 | |
| 2080 | /* Now check for global symbols. */ |
| 2081 | { |
| 2082 | int symcount; |
| 2083 | struct elf_link_hash_entry **sym_hashes; |
| 2084 | struct elf_link_hash_entry **end_hashes; |
| 2085 | |
| 2086 | symcount = (symtab_hdr->sh_size |
| 2087 | / sizeof (Elf32_External_Sym) |
| 2088 | - symtab_hdr->sh_info); |
| 2089 | sym_hashes = elf_sym_hashes (abfd); |
| 2090 | end_hashes = sym_hashes + symcount; |
| 2091 | for (; sym_hashes < end_hashes; sym_hashes++) |
| 2092 | { |
| 2093 | struct elf_link_hash_entry *sym_hash = |
| 2094 | *sym_hashes; |
| 2095 | if ((sym_hash->root.type == bfd_link_hash_defined |
| 2096 | || sym_hash->root.type == |
| 2097 | bfd_link_hash_defweak) |
| 2098 | && sym_hash->root.u.def.section == sec |
| 2099 | && sym_hash->root.u.def.value == section_offset_of_ret_insn) |
| 2100 | { |
| 2101 | deleting_ret_is_safe = 0; |
| 2102 | if (debug_relax) |
| 2103 | printf ("global label prevents deletion of " |
| 2104 | "ret insn at address 0x%x\n", |
| 2105 | (int) dot + insn_size); |
| 2106 | } |
| 2107 | } |
| 2108 | } |
| 2109 | /* Now we check for relocations pointing to ret. */ |
| 2110 | { |
| 2111 | Elf_Internal_Rela *irel; |
| 2112 | Elf_Internal_Rela *relend; |
| 2113 | Elf_Internal_Shdr *symtab_hdr; |
| 2114 | |
| 2115 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 2116 | relend = elf_section_data (sec)->relocs |
| 2117 | + sec->reloc_count; |
| 2118 | |
| 2119 | for (irel = elf_section_data (sec)->relocs; |
| 2120 | irel < relend; irel++) |
| 2121 | { |
| 2122 | bfd_vma reloc_target = 0; |
| 2123 | bfd_vma symval; |
| 2124 | Elf_Internal_Sym *isymbuf = NULL; |
| 2125 | |
| 2126 | /* Read this BFD's local symbols if we haven't |
| 2127 | done so already. */ |
| 2128 | if (isymbuf == NULL && symtab_hdr->sh_info != 0) |
| 2129 | { |
| 2130 | isymbuf = (Elf_Internal_Sym *) |
| 2131 | symtab_hdr->contents; |
| 2132 | if (isymbuf == NULL) |
| 2133 | isymbuf = bfd_elf_get_elf_syms |
| 2134 | (abfd, |
| 2135 | symtab_hdr, |
| 2136 | symtab_hdr->sh_info, 0, |
| 2137 | NULL, NULL, NULL); |
| 2138 | if (isymbuf == NULL) |
| 2139 | break; |
| 2140 | } |
| 2141 | |
| 2142 | /* Get the value of the symbol referred to |
| 2143 | by the reloc. */ |
| 2144 | if (ELF32_R_SYM (irel->r_info) |
| 2145 | < symtab_hdr->sh_info) |
| 2146 | { |
| 2147 | /* A local symbol. */ |
| 2148 | Elf_Internal_Sym *isym; |
| 2149 | asection *sym_sec; |
| 2150 | |
| 2151 | isym = isymbuf |
| 2152 | + ELF32_R_SYM (irel->r_info); |
| 2153 | sym_sec = bfd_section_from_elf_index |
| 2154 | (abfd, isym->st_shndx); |
| 2155 | symval = isym->st_value; |
| 2156 | |
| 2157 | /* If the reloc is absolute, it will not |
| 2158 | have a symbol or section associated |
| 2159 | with it. */ |
| 2160 | |
| 2161 | if (sym_sec) |
| 2162 | { |
| 2163 | symval += |
| 2164 | sym_sec->output_section->vma |
| 2165 | + sym_sec->output_offset; |
| 2166 | reloc_target = symval + irel->r_addend; |
| 2167 | } |
| 2168 | else |
| 2169 | { |
| 2170 | reloc_target = symval + irel->r_addend; |
| 2171 | /* Reference symbol is absolute. */ |
| 2172 | } |
| 2173 | } |
| 2174 | /* else ... reference symbol is extern. */ |
| 2175 | |
| 2176 | if (address_of_ret == reloc_target) |
| 2177 | { |
| 2178 | deleting_ret_is_safe = 0; |
| 2179 | if (debug_relax) |
| 2180 | printf ("ret from " |
| 2181 | "rjmp/jmp ret sequence at address" |
| 2182 | " 0x%x could not be deleted. ret" |
| 2183 | " is target of a relocation.\n", |
| 2184 | (int) address_of_ret); |
| 2185 | } |
| 2186 | } |
| 2187 | } |
| 2188 | |
| 2189 | if (deleting_ret_is_safe) |
| 2190 | { |
| 2191 | if (debug_relax) |
| 2192 | printf ("unreachable ret instruction " |
| 2193 | "at address 0x%x deleted.\n", |
| 2194 | (int) dot + insn_size); |
| 2195 | |
| 2196 | /* Delete two bytes of data. */ |
| 2197 | if (!elf32_avr_relax_delete_bytes (abfd, sec, |
| 2198 | irel->r_offset + insn_size, 2)) |
| 2199 | goto error_return; |
| 2200 | |
| 2201 | /* That will change things, so, we should relax |
| 2202 | again. Note that this is not required, and it |
| 2203 | may be slow. */ |
| 2204 | *again = TRUE; |
| 2205 | break; |
| 2206 | } |
| 2207 | } |
| 2208 | |
| 2209 | } |
| 2210 | } |
| 2211 | break; |
| 2212 | } |
| 2213 | } |
| 2214 | } |
| 2215 | |
| 2216 | if (contents != NULL |
| 2217 | && elf_section_data (sec)->this_hdr.contents != contents) |
| 2218 | { |
| 2219 | if (! link_info->keep_memory) |
| 2220 | free (contents); |
| 2221 | else |
| 2222 | { |
| 2223 | /* Cache the section contents for elf_link_input_bfd. */ |
| 2224 | elf_section_data (sec)->this_hdr.contents = contents; |
| 2225 | } |
| 2226 | } |
| 2227 | |
| 2228 | if (internal_relocs != NULL |
| 2229 | && elf_section_data (sec)->relocs != internal_relocs) |
| 2230 | free (internal_relocs); |
| 2231 | |
| 2232 | return TRUE; |
| 2233 | |
| 2234 | error_return: |
| 2235 | if (isymbuf != NULL |
| 2236 | && symtab_hdr->contents != (unsigned char *) isymbuf) |
| 2237 | free (isymbuf); |
| 2238 | if (contents != NULL |
| 2239 | && elf_section_data (sec)->this_hdr.contents != contents) |
| 2240 | free (contents); |
| 2241 | if (internal_relocs != NULL |
| 2242 | && elf_section_data (sec)->relocs != internal_relocs) |
| 2243 | free (internal_relocs); |
| 2244 | |
| 2245 | return FALSE; |
| 2246 | } |
| 2247 | |
| 2248 | /* This is a version of bfd_generic_get_relocated_section_contents |
| 2249 | which uses elf32_avr_relocate_section. |
| 2250 | |
| 2251 | For avr it's essentially a cut and paste taken from the H8300 port. |
| 2252 | The author of the relaxation support patch for avr had absolutely no |
| 2253 | clue what is happening here but found out that this part of the code |
| 2254 | seems to be important. */ |
| 2255 | |
| 2256 | static bfd_byte * |
| 2257 | elf32_avr_get_relocated_section_contents (bfd *output_bfd, |
| 2258 | struct bfd_link_info *link_info, |
| 2259 | struct bfd_link_order *link_order, |
| 2260 | bfd_byte *data, |
| 2261 | bfd_boolean relocatable, |
| 2262 | asymbol **symbols) |
| 2263 | { |
| 2264 | Elf_Internal_Shdr *symtab_hdr; |
| 2265 | asection *input_section = link_order->u.indirect.section; |
| 2266 | bfd *input_bfd = input_section->owner; |
| 2267 | asection **sections = NULL; |
| 2268 | Elf_Internal_Rela *internal_relocs = NULL; |
| 2269 | Elf_Internal_Sym *isymbuf = NULL; |
| 2270 | |
| 2271 | /* We only need to handle the case of relaxing, or of having a |
| 2272 | particular set of section contents, specially. */ |
| 2273 | if (relocatable |
| 2274 | || elf_section_data (input_section)->this_hdr.contents == NULL) |
| 2275 | return bfd_generic_get_relocated_section_contents (output_bfd, link_info, |
| 2276 | link_order, data, |
| 2277 | relocatable, |
| 2278 | symbols); |
| 2279 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 2280 | |
| 2281 | memcpy (data, elf_section_data (input_section)->this_hdr.contents, |
| 2282 | (size_t) input_section->size); |
| 2283 | |
| 2284 | if ((input_section->flags & SEC_RELOC) != 0 |
| 2285 | && input_section->reloc_count > 0) |
| 2286 | { |
| 2287 | asection **secpp; |
| 2288 | Elf_Internal_Sym *isym, *isymend; |
| 2289 | bfd_size_type amt; |
| 2290 | |
| 2291 | internal_relocs = (_bfd_elf_link_read_relocs |
| 2292 | (input_bfd, input_section, NULL, NULL, FALSE)); |
| 2293 | if (internal_relocs == NULL) |
| 2294 | goto error_return; |
| 2295 | |
| 2296 | if (symtab_hdr->sh_info != 0) |
| 2297 | { |
| 2298 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 2299 | if (isymbuf == NULL) |
| 2300 | isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, |
| 2301 | symtab_hdr->sh_info, 0, |
| 2302 | NULL, NULL, NULL); |
| 2303 | if (isymbuf == NULL) |
| 2304 | goto error_return; |
| 2305 | } |
| 2306 | |
| 2307 | amt = symtab_hdr->sh_info; |
| 2308 | amt *= sizeof (asection *); |
| 2309 | sections = bfd_malloc (amt); |
| 2310 | if (sections == NULL && amt != 0) |
| 2311 | goto error_return; |
| 2312 | |
| 2313 | isymend = isymbuf + symtab_hdr->sh_info; |
| 2314 | for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp) |
| 2315 | { |
| 2316 | asection *isec; |
| 2317 | |
| 2318 | if (isym->st_shndx == SHN_UNDEF) |
| 2319 | isec = bfd_und_section_ptr; |
| 2320 | else if (isym->st_shndx == SHN_ABS) |
| 2321 | isec = bfd_abs_section_ptr; |
| 2322 | else if (isym->st_shndx == SHN_COMMON) |
| 2323 | isec = bfd_com_section_ptr; |
| 2324 | else |
| 2325 | isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx); |
| 2326 | |
| 2327 | *secpp = isec; |
| 2328 | } |
| 2329 | |
| 2330 | if (! elf32_avr_relocate_section (output_bfd, link_info, input_bfd, |
| 2331 | input_section, data, internal_relocs, |
| 2332 | isymbuf, sections)) |
| 2333 | goto error_return; |
| 2334 | |
| 2335 | if (sections != NULL) |
| 2336 | free (sections); |
| 2337 | if (isymbuf != NULL |
| 2338 | && symtab_hdr->contents != (unsigned char *) isymbuf) |
| 2339 | free (isymbuf); |
| 2340 | if (elf_section_data (input_section)->relocs != internal_relocs) |
| 2341 | free (internal_relocs); |
| 2342 | } |
| 2343 | |
| 2344 | return data; |
| 2345 | |
| 2346 | error_return: |
| 2347 | if (sections != NULL) |
| 2348 | free (sections); |
| 2349 | if (isymbuf != NULL |
| 2350 | && symtab_hdr->contents != (unsigned char *) isymbuf) |
| 2351 | free (isymbuf); |
| 2352 | if (internal_relocs != NULL |
| 2353 | && elf_section_data (input_section)->relocs != internal_relocs) |
| 2354 | free (internal_relocs); |
| 2355 | return NULL; |
| 2356 | } |
| 2357 | |
| 2358 | |
| 2359 | /* Determines the hash entry name for a particular reloc. It consists of |
| 2360 | the identifier of the symbol section and the added reloc addend and |
| 2361 | symbol offset relative to the section the symbol is attached to. */ |
| 2362 | |
| 2363 | static char * |
| 2364 | avr_stub_name (const asection *symbol_section, |
| 2365 | const bfd_vma symbol_offset, |
| 2366 | const Elf_Internal_Rela *rela) |
| 2367 | { |
| 2368 | char *stub_name; |
| 2369 | bfd_size_type len; |
| 2370 | |
| 2371 | len = 8 + 1 + 8 + 1 + 1; |
| 2372 | stub_name = bfd_malloc (len); |
| 2373 | |
| 2374 | sprintf (stub_name, "%08x+%08x", |
| 2375 | symbol_section->id & 0xffffffff, |
| 2376 | (unsigned int) ((rela->r_addend & 0xffffffff) + symbol_offset)); |
| 2377 | |
| 2378 | return stub_name; |
| 2379 | } |
| 2380 | |
| 2381 | |
| 2382 | /* Add a new stub entry to the stub hash. Not all fields of the new |
| 2383 | stub entry are initialised. */ |
| 2384 | |
| 2385 | static struct elf32_avr_stub_hash_entry * |
| 2386 | avr_add_stub (const char *stub_name, |
| 2387 | struct elf32_avr_link_hash_table *htab) |
| 2388 | { |
| 2389 | struct elf32_avr_stub_hash_entry *hsh; |
| 2390 | |
| 2391 | /* Enter this entry into the linker stub hash table. */ |
| 2392 | hsh = avr_stub_hash_lookup (&htab->bstab, stub_name, TRUE, FALSE); |
| 2393 | |
| 2394 | if (hsh == NULL) |
| 2395 | { |
| 2396 | (*_bfd_error_handler) (_("%B: cannot create stub entry %s"), |
| 2397 | NULL, stub_name); |
| 2398 | return NULL; |
| 2399 | } |
| 2400 | |
| 2401 | hsh->stub_offset = 0; |
| 2402 | return hsh; |
| 2403 | } |
| 2404 | |
| 2405 | /* We assume that there is already space allocated for the stub section |
| 2406 | contents and that before building the stubs the section size is |
| 2407 | initialized to 0. We assume that within the stub hash table entry, |
| 2408 | the absolute position of the jmp target has been written in the |
| 2409 | target_value field. We write here the offset of the generated jmp insn |
| 2410 | relative to the trampoline section start to the stub_offset entry in |
| 2411 | the stub hash table entry. */ |
| 2412 | |
| 2413 | static bfd_boolean |
| 2414 | avr_build_one_stub (struct bfd_hash_entry *bh, void *in_arg) |
| 2415 | { |
| 2416 | struct elf32_avr_stub_hash_entry *hsh; |
| 2417 | struct bfd_link_info *info; |
| 2418 | struct elf32_avr_link_hash_table *htab; |
| 2419 | bfd *stub_bfd; |
| 2420 | bfd_byte *loc; |
| 2421 | bfd_vma target; |
| 2422 | bfd_vma starget; |
| 2423 | |
| 2424 | /* Basic opcode */ |
| 2425 | bfd_vma jmp_insn = 0x0000940c; |
| 2426 | |
| 2427 | /* Massage our args to the form they really have. */ |
| 2428 | hsh = avr_stub_hash_entry (bh); |
| 2429 | |
| 2430 | if (!hsh->is_actually_needed) |
| 2431 | return TRUE; |
| 2432 | |
| 2433 | info = (struct bfd_link_info *) in_arg; |
| 2434 | |
| 2435 | htab = avr_link_hash_table (info); |
| 2436 | if (htab == NULL) |
| 2437 | return FALSE; |
| 2438 | |
| 2439 | target = hsh->target_value; |
| 2440 | |
| 2441 | /* Make a note of the offset within the stubs for this entry. */ |
| 2442 | hsh->stub_offset = htab->stub_sec->size; |
| 2443 | loc = htab->stub_sec->contents + hsh->stub_offset; |
| 2444 | |
| 2445 | stub_bfd = htab->stub_sec->owner; |
| 2446 | |
| 2447 | if (debug_stubs) |
| 2448 | printf ("Building one Stub. Address: 0x%x, Offset: 0x%x\n", |
| 2449 | (unsigned int) target, |
| 2450 | (unsigned int) hsh->stub_offset); |
| 2451 | |
| 2452 | /* We now have to add the information on the jump target to the bare |
| 2453 | opcode bits already set in jmp_insn. */ |
| 2454 | |
| 2455 | /* Check for the alignment of the address. */ |
| 2456 | if (target & 1) |
| 2457 | return FALSE; |
| 2458 | |
| 2459 | starget = target >> 1; |
| 2460 | jmp_insn |= ((starget & 0x10000) | ((starget << 3) & 0x1f00000)) >> 16; |
| 2461 | bfd_put_16 (stub_bfd, jmp_insn, loc); |
| 2462 | bfd_put_16 (stub_bfd, (bfd_vma) starget & 0xffff, loc + 2); |
| 2463 | |
| 2464 | htab->stub_sec->size += 4; |
| 2465 | |
| 2466 | /* Now add the entries in the address mapping table if there is still |
| 2467 | space left. */ |
| 2468 | { |
| 2469 | unsigned int nr; |
| 2470 | |
| 2471 | nr = htab->amt_entry_cnt + 1; |
| 2472 | if (nr <= htab->amt_max_entry_cnt) |
| 2473 | { |
| 2474 | htab->amt_entry_cnt = nr; |
| 2475 | |
| 2476 | htab->amt_stub_offsets[nr - 1] = hsh->stub_offset; |
| 2477 | htab->amt_destination_addr[nr - 1] = target; |
| 2478 | } |
| 2479 | } |
| 2480 | |
| 2481 | return TRUE; |
| 2482 | } |
| 2483 | |
| 2484 | static bfd_boolean |
| 2485 | avr_mark_stub_not_to_be_necessary (struct bfd_hash_entry *bh, |
| 2486 | void *in_arg) |
| 2487 | { |
| 2488 | struct elf32_avr_stub_hash_entry *hsh; |
| 2489 | struct elf32_avr_link_hash_table *htab; |
| 2490 | |
| 2491 | htab = in_arg; |
| 2492 | hsh = avr_stub_hash_entry (bh); |
| 2493 | hsh->is_actually_needed = FALSE; |
| 2494 | |
| 2495 | return TRUE; |
| 2496 | } |
| 2497 | |
| 2498 | static bfd_boolean |
| 2499 | avr_size_one_stub (struct bfd_hash_entry *bh, void *in_arg) |
| 2500 | { |
| 2501 | struct elf32_avr_stub_hash_entry *hsh; |
| 2502 | struct elf32_avr_link_hash_table *htab; |
| 2503 | int size; |
| 2504 | |
| 2505 | /* Massage our args to the form they really have. */ |
| 2506 | hsh = avr_stub_hash_entry (bh); |
| 2507 | htab = in_arg; |
| 2508 | |
| 2509 | if (hsh->is_actually_needed) |
| 2510 | size = 4; |
| 2511 | else |
| 2512 | size = 0; |
| 2513 | |
| 2514 | htab->stub_sec->size += size; |
| 2515 | return TRUE; |
| 2516 | } |
| 2517 | |
| 2518 | void |
| 2519 | elf32_avr_setup_params (struct bfd_link_info *info, |
| 2520 | bfd *avr_stub_bfd, |
| 2521 | asection *avr_stub_section, |
| 2522 | bfd_boolean no_stubs, |
| 2523 | bfd_boolean deb_stubs, |
| 2524 | bfd_boolean deb_relax, |
| 2525 | bfd_vma pc_wrap_around, |
| 2526 | bfd_boolean call_ret_replacement) |
| 2527 | { |
| 2528 | struct elf32_avr_link_hash_table *htab = avr_link_hash_table (info); |
| 2529 | |
| 2530 | if (htab == NULL) |
| 2531 | return; |
| 2532 | htab->stub_sec = avr_stub_section; |
| 2533 | htab->stub_bfd = avr_stub_bfd; |
| 2534 | htab->no_stubs = no_stubs; |
| 2535 | |
| 2536 | debug_relax = deb_relax; |
| 2537 | debug_stubs = deb_stubs; |
| 2538 | avr_pc_wrap_around = pc_wrap_around; |
| 2539 | avr_replace_call_ret_sequences = call_ret_replacement; |
| 2540 | } |
| 2541 | |
| 2542 | |
| 2543 | /* Set up various things so that we can make a list of input sections |
| 2544 | for each output section included in the link. Returns -1 on error, |
| 2545 | 0 when no stubs will be needed, and 1 on success. It also sets |
| 2546 | information on the stubs bfd and the stub section in the info |
| 2547 | struct. */ |
| 2548 | |
| 2549 | int |
| 2550 | elf32_avr_setup_section_lists (bfd *output_bfd, |
| 2551 | struct bfd_link_info *info) |
| 2552 | { |
| 2553 | bfd *input_bfd; |
| 2554 | unsigned int bfd_count; |
| 2555 | int top_id, top_index; |
| 2556 | asection *section; |
| 2557 | asection **input_list, **list; |
| 2558 | bfd_size_type amt; |
| 2559 | struct elf32_avr_link_hash_table *htab = avr_link_hash_table(info); |
| 2560 | |
| 2561 | if (htab == NULL || htab->no_stubs) |
| 2562 | return 0; |
| 2563 | |
| 2564 | /* Count the number of input BFDs and find the top input section id. */ |
| 2565 | for (input_bfd = info->input_bfds, bfd_count = 0, top_id = 0; |
| 2566 | input_bfd != NULL; |
| 2567 | input_bfd = input_bfd->link_next) |
| 2568 | { |
| 2569 | bfd_count += 1; |
| 2570 | for (section = input_bfd->sections; |
| 2571 | section != NULL; |
| 2572 | section = section->next) |
| 2573 | if (top_id < section->id) |
| 2574 | top_id = section->id; |
| 2575 | } |
| 2576 | |
| 2577 | htab->bfd_count = bfd_count; |
| 2578 | |
| 2579 | /* We can't use output_bfd->section_count here to find the top output |
| 2580 | section index as some sections may have been removed, and |
| 2581 | strip_excluded_output_sections doesn't renumber the indices. */ |
| 2582 | for (section = output_bfd->sections, top_index = 0; |
| 2583 | section != NULL; |
| 2584 | section = section->next) |
| 2585 | if (top_index < section->index) |
| 2586 | top_index = section->index; |
| 2587 | |
| 2588 | htab->top_index = top_index; |
| 2589 | amt = sizeof (asection *) * (top_index + 1); |
| 2590 | input_list = bfd_malloc (amt); |
| 2591 | htab->input_list = input_list; |
| 2592 | if (input_list == NULL) |
| 2593 | return -1; |
| 2594 | |
| 2595 | /* For sections we aren't interested in, mark their entries with a |
| 2596 | value we can check later. */ |
| 2597 | list = input_list + top_index; |
| 2598 | do |
| 2599 | *list = bfd_abs_section_ptr; |
| 2600 | while (list-- != input_list); |
| 2601 | |
| 2602 | for (section = output_bfd->sections; |
| 2603 | section != NULL; |
| 2604 | section = section->next) |
| 2605 | if ((section->flags & SEC_CODE) != 0) |
| 2606 | input_list[section->index] = NULL; |
| 2607 | |
| 2608 | return 1; |
| 2609 | } |
| 2610 | |
| 2611 | |
| 2612 | /* Read in all local syms for all input bfds, and create hash entries |
| 2613 | for export stubs if we are building a multi-subspace shared lib. |
| 2614 | Returns -1 on error, 0 otherwise. */ |
| 2615 | |
| 2616 | static int |
| 2617 | get_local_syms (bfd *input_bfd, struct bfd_link_info *info) |
| 2618 | { |
| 2619 | unsigned int bfd_indx; |
| 2620 | Elf_Internal_Sym *local_syms, **all_local_syms; |
| 2621 | struct elf32_avr_link_hash_table *htab = avr_link_hash_table (info); |
| 2622 | bfd_size_type amt; |
| 2623 | |
| 2624 | if (htab == NULL) |
| 2625 | return -1; |
| 2626 | |
| 2627 | /* We want to read in symbol extension records only once. To do this |
| 2628 | we need to read in the local symbols in parallel and save them for |
| 2629 | later use; so hold pointers to the local symbols in an array. */ |
| 2630 | amt = sizeof (Elf_Internal_Sym *) * htab->bfd_count; |
| 2631 | all_local_syms = bfd_zmalloc (amt); |
| 2632 | htab->all_local_syms = all_local_syms; |
| 2633 | if (all_local_syms == NULL) |
| 2634 | return -1; |
| 2635 | |
| 2636 | /* Walk over all the input BFDs, swapping in local symbols. |
| 2637 | If we are creating a shared library, create hash entries for the |
| 2638 | export stubs. */ |
| 2639 | for (bfd_indx = 0; |
| 2640 | input_bfd != NULL; |
| 2641 | input_bfd = input_bfd->link_next, bfd_indx++) |
| 2642 | { |
| 2643 | Elf_Internal_Shdr *symtab_hdr; |
| 2644 | |
| 2645 | /* We'll need the symbol table in a second. */ |
| 2646 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 2647 | if (symtab_hdr->sh_info == 0) |
| 2648 | continue; |
| 2649 | |
| 2650 | /* We need an array of the local symbols attached to the input bfd. */ |
| 2651 | local_syms = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 2652 | if (local_syms == NULL) |
| 2653 | { |
| 2654 | local_syms = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, |
| 2655 | symtab_hdr->sh_info, 0, |
| 2656 | NULL, NULL, NULL); |
| 2657 | /* Cache them for elf_link_input_bfd. */ |
| 2658 | symtab_hdr->contents = (unsigned char *) local_syms; |
| 2659 | } |
| 2660 | if (local_syms == NULL) |
| 2661 | return -1; |
| 2662 | |
| 2663 | all_local_syms[bfd_indx] = local_syms; |
| 2664 | } |
| 2665 | |
| 2666 | return 0; |
| 2667 | } |
| 2668 | |
| 2669 | #define ADD_DUMMY_STUBS_FOR_DEBUGGING 0 |
| 2670 | |
| 2671 | bfd_boolean |
| 2672 | elf32_avr_size_stubs (bfd *output_bfd, |
| 2673 | struct bfd_link_info *info, |
| 2674 | bfd_boolean is_prealloc_run) |
| 2675 | { |
| 2676 | struct elf32_avr_link_hash_table *htab; |
| 2677 | int stub_changed = 0; |
| 2678 | |
| 2679 | htab = avr_link_hash_table (info); |
| 2680 | if (htab == NULL) |
| 2681 | return FALSE; |
| 2682 | |
| 2683 | /* At this point we initialize htab->vector_base |
| 2684 | To the start of the text output section. */ |
| 2685 | htab->vector_base = htab->stub_sec->output_section->vma; |
| 2686 | |
| 2687 | if (get_local_syms (info->input_bfds, info)) |
| 2688 | { |
| 2689 | if (htab->all_local_syms) |
| 2690 | goto error_ret_free_local; |
| 2691 | return FALSE; |
| 2692 | } |
| 2693 | |
| 2694 | if (ADD_DUMMY_STUBS_FOR_DEBUGGING) |
| 2695 | { |
| 2696 | struct elf32_avr_stub_hash_entry *test; |
| 2697 | |
| 2698 | test = avr_add_stub ("Hugo",htab); |
| 2699 | test->target_value = 0x123456; |
| 2700 | test->stub_offset = 13; |
| 2701 | |
| 2702 | test = avr_add_stub ("Hugo2",htab); |
| 2703 | test->target_value = 0x84210; |
| 2704 | test->stub_offset = 14; |
| 2705 | } |
| 2706 | |
| 2707 | while (1) |
| 2708 | { |
| 2709 | bfd *input_bfd; |
| 2710 | unsigned int bfd_indx; |
| 2711 | |
| 2712 | /* We will have to re-generate the stub hash table each time anything |
| 2713 | in memory has changed. */ |
| 2714 | |
| 2715 | bfd_hash_traverse (&htab->bstab, avr_mark_stub_not_to_be_necessary, htab); |
| 2716 | for (input_bfd = info->input_bfds, bfd_indx = 0; |
| 2717 | input_bfd != NULL; |
| 2718 | input_bfd = input_bfd->link_next, bfd_indx++) |
| 2719 | { |
| 2720 | Elf_Internal_Shdr *symtab_hdr; |
| 2721 | asection *section; |
| 2722 | Elf_Internal_Sym *local_syms; |
| 2723 | |
| 2724 | /* We'll need the symbol table in a second. */ |
| 2725 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 2726 | if (symtab_hdr->sh_info == 0) |
| 2727 | continue; |
| 2728 | |
| 2729 | local_syms = htab->all_local_syms[bfd_indx]; |
| 2730 | |
| 2731 | /* Walk over each section attached to the input bfd. */ |
| 2732 | for (section = input_bfd->sections; |
| 2733 | section != NULL; |
| 2734 | section = section->next) |
| 2735 | { |
| 2736 | Elf_Internal_Rela *internal_relocs, *irelaend, *irela; |
| 2737 | |
| 2738 | /* If there aren't any relocs, then there's nothing more |
| 2739 | to do. */ |
| 2740 | if ((section->flags & SEC_RELOC) == 0 |
| 2741 | || section->reloc_count == 0) |
| 2742 | continue; |
| 2743 | |
| 2744 | /* If this section is a link-once section that will be |
| 2745 | discarded, then don't create any stubs. */ |
| 2746 | if (section->output_section == NULL |
| 2747 | || section->output_section->owner != output_bfd) |
| 2748 | continue; |
| 2749 | |
| 2750 | /* Get the relocs. */ |
| 2751 | internal_relocs |
| 2752 | = _bfd_elf_link_read_relocs (input_bfd, section, NULL, NULL, |
| 2753 | info->keep_memory); |
| 2754 | if (internal_relocs == NULL) |
| 2755 | goto error_ret_free_local; |
| 2756 | |
| 2757 | /* Now examine each relocation. */ |
| 2758 | irela = internal_relocs; |
| 2759 | irelaend = irela + section->reloc_count; |
| 2760 | for (; irela < irelaend; irela++) |
| 2761 | { |
| 2762 | unsigned int r_type, r_indx; |
| 2763 | struct elf32_avr_stub_hash_entry *hsh; |
| 2764 | asection *sym_sec; |
| 2765 | bfd_vma sym_value; |
| 2766 | bfd_vma destination; |
| 2767 | struct elf_link_hash_entry *hh; |
| 2768 | char *stub_name; |
| 2769 | |
| 2770 | r_type = ELF32_R_TYPE (irela->r_info); |
| 2771 | r_indx = ELF32_R_SYM (irela->r_info); |
| 2772 | |
| 2773 | /* Only look for 16 bit GS relocs. No other reloc will need a |
| 2774 | stub. */ |
| 2775 | if (!((r_type == R_AVR_16_PM) |
| 2776 | || (r_type == R_AVR_LO8_LDI_GS) |
| 2777 | || (r_type == R_AVR_HI8_LDI_GS))) |
| 2778 | continue; |
| 2779 | |
| 2780 | /* Now determine the call target, its name, value, |
| 2781 | section. */ |
| 2782 | sym_sec = NULL; |
| 2783 | sym_value = 0; |
| 2784 | destination = 0; |
| 2785 | hh = NULL; |
| 2786 | if (r_indx < symtab_hdr->sh_info) |
| 2787 | { |
| 2788 | /* It's a local symbol. */ |
| 2789 | Elf_Internal_Sym *sym; |
| 2790 | Elf_Internal_Shdr *hdr; |
| 2791 | unsigned int shndx; |
| 2792 | |
| 2793 | sym = local_syms + r_indx; |
| 2794 | if (ELF_ST_TYPE (sym->st_info) != STT_SECTION) |
| 2795 | sym_value = sym->st_value; |
| 2796 | shndx = sym->st_shndx; |
| 2797 | if (shndx < elf_numsections (input_bfd)) |
| 2798 | { |
| 2799 | hdr = elf_elfsections (input_bfd)[shndx]; |
| 2800 | sym_sec = hdr->bfd_section; |
| 2801 | destination = (sym_value + irela->r_addend |
| 2802 | + sym_sec->output_offset |
| 2803 | + sym_sec->output_section->vma); |
| 2804 | } |
| 2805 | } |
| 2806 | else |
| 2807 | { |
| 2808 | /* It's an external symbol. */ |
| 2809 | int e_indx; |
| 2810 | |
| 2811 | e_indx = r_indx - symtab_hdr->sh_info; |
| 2812 | hh = elf_sym_hashes (input_bfd)[e_indx]; |
| 2813 | |
| 2814 | while (hh->root.type == bfd_link_hash_indirect |
| 2815 | || hh->root.type == bfd_link_hash_warning) |
| 2816 | hh = (struct elf_link_hash_entry *) |
| 2817 | (hh->root.u.i.link); |
| 2818 | |
| 2819 | if (hh->root.type == bfd_link_hash_defined |
| 2820 | || hh->root.type == bfd_link_hash_defweak) |
| 2821 | { |
| 2822 | sym_sec = hh->root.u.def.section; |
| 2823 | sym_value = hh->root.u.def.value; |
| 2824 | if (sym_sec->output_section != NULL) |
| 2825 | destination = (sym_value + irela->r_addend |
| 2826 | + sym_sec->output_offset |
| 2827 | + sym_sec->output_section->vma); |
| 2828 | } |
| 2829 | else if (hh->root.type == bfd_link_hash_undefweak) |
| 2830 | { |
| 2831 | if (! info->shared) |
| 2832 | continue; |
| 2833 | } |
| 2834 | else if (hh->root.type == bfd_link_hash_undefined) |
| 2835 | { |
| 2836 | if (! (info->unresolved_syms_in_objects == RM_IGNORE |
| 2837 | && (ELF_ST_VISIBILITY (hh->other) |
| 2838 | == STV_DEFAULT))) |
| 2839 | continue; |
| 2840 | } |
| 2841 | else |
| 2842 | { |
| 2843 | bfd_set_error (bfd_error_bad_value); |
| 2844 | |
| 2845 | error_ret_free_internal: |
| 2846 | if (elf_section_data (section)->relocs == NULL) |
| 2847 | free (internal_relocs); |
| 2848 | goto error_ret_free_local; |
| 2849 | } |
| 2850 | } |
| 2851 | |
| 2852 | if (! avr_stub_is_required_for_16_bit_reloc |
| 2853 | (destination - htab->vector_base)) |
| 2854 | { |
| 2855 | if (!is_prealloc_run) |
| 2856 | /* We are having a reloc that does't need a stub. */ |
| 2857 | continue; |
| 2858 | |
| 2859 | /* We don't right now know if a stub will be needed. |
| 2860 | Let's rather be on the safe side. */ |
| 2861 | } |
| 2862 | |
| 2863 | /* Get the name of this stub. */ |
| 2864 | stub_name = avr_stub_name (sym_sec, sym_value, irela); |
| 2865 | |
| 2866 | if (!stub_name) |
| 2867 | goto error_ret_free_internal; |
| 2868 | |
| 2869 | |
| 2870 | hsh = avr_stub_hash_lookup (&htab->bstab, |
| 2871 | stub_name, |
| 2872 | FALSE, FALSE); |
| 2873 | if (hsh != NULL) |
| 2874 | { |
| 2875 | /* The proper stub has already been created. Mark it |
| 2876 | to be used and write the possibly changed destination |
| 2877 | value. */ |
| 2878 | hsh->is_actually_needed = TRUE; |
| 2879 | hsh->target_value = destination; |
| 2880 | free (stub_name); |
| 2881 | continue; |
| 2882 | } |
| 2883 | |
| 2884 | hsh = avr_add_stub (stub_name, htab); |
| 2885 | if (hsh == NULL) |
| 2886 | { |
| 2887 | free (stub_name); |
| 2888 | goto error_ret_free_internal; |
| 2889 | } |
| 2890 | |
| 2891 | hsh->is_actually_needed = TRUE; |
| 2892 | hsh->target_value = destination; |
| 2893 | |
| 2894 | if (debug_stubs) |
| 2895 | printf ("Adding stub with destination 0x%x to the" |
| 2896 | " hash table.\n", (unsigned int) destination); |
| 2897 | if (debug_stubs) |
| 2898 | printf ("(Pre-Alloc run: %i)\n", is_prealloc_run); |
| 2899 | |
| 2900 | stub_changed = TRUE; |
| 2901 | } |
| 2902 | |
| 2903 | /* We're done with the internal relocs, free them. */ |
| 2904 | if (elf_section_data (section)->relocs == NULL) |
| 2905 | free (internal_relocs); |
| 2906 | } |
| 2907 | } |
| 2908 | |
| 2909 | /* Re-Calculate the number of needed stubs. */ |
| 2910 | htab->stub_sec->size = 0; |
| 2911 | bfd_hash_traverse (&htab->bstab, avr_size_one_stub, htab); |
| 2912 | |
| 2913 | if (!stub_changed) |
| 2914 | break; |
| 2915 | |
| 2916 | stub_changed = FALSE; |
| 2917 | } |
| 2918 | |
| 2919 | free (htab->all_local_syms); |
| 2920 | return TRUE; |
| 2921 | |
| 2922 | error_ret_free_local: |
| 2923 | free (htab->all_local_syms); |
| 2924 | return FALSE; |
| 2925 | } |
| 2926 | |
| 2927 | |
| 2928 | /* Build all the stubs associated with the current output file. The |
| 2929 | stubs are kept in a hash table attached to the main linker hash |
| 2930 | table. We also set up the .plt entries for statically linked PIC |
| 2931 | functions here. This function is called via hppaelf_finish in the |
| 2932 | linker. */ |
| 2933 | |
| 2934 | bfd_boolean |
| 2935 | elf32_avr_build_stubs (struct bfd_link_info *info) |
| 2936 | { |
| 2937 | asection *stub_sec; |
| 2938 | struct bfd_hash_table *table; |
| 2939 | struct elf32_avr_link_hash_table *htab; |
| 2940 | bfd_size_type total_size = 0; |
| 2941 | |
| 2942 | htab = avr_link_hash_table (info); |
| 2943 | if (htab == NULL) |
| 2944 | return FALSE; |
| 2945 | |
| 2946 | /* In case that there were several stub sections: */ |
| 2947 | for (stub_sec = htab->stub_bfd->sections; |
| 2948 | stub_sec != NULL; |
| 2949 | stub_sec = stub_sec->next) |
| 2950 | { |
| 2951 | bfd_size_type size; |
| 2952 | |
| 2953 | /* Allocate memory to hold the linker stubs. */ |
| 2954 | size = stub_sec->size; |
| 2955 | total_size += size; |
| 2956 | |
| 2957 | stub_sec->contents = bfd_zalloc (htab->stub_bfd, size); |
| 2958 | if (stub_sec->contents == NULL && size != 0) |
| 2959 | return FALSE; |
| 2960 | stub_sec->size = 0; |
| 2961 | } |
| 2962 | |
| 2963 | /* Allocate memory for the adress mapping table. */ |
| 2964 | htab->amt_entry_cnt = 0; |
| 2965 | htab->amt_max_entry_cnt = total_size / 4; |
| 2966 | htab->amt_stub_offsets = bfd_malloc (sizeof (bfd_vma) |
| 2967 | * htab->amt_max_entry_cnt); |
| 2968 | htab->amt_destination_addr = bfd_malloc (sizeof (bfd_vma) |
| 2969 | * htab->amt_max_entry_cnt ); |
| 2970 | |
| 2971 | if (debug_stubs) |
| 2972 | printf ("Allocating %i entries in the AMT\n", htab->amt_max_entry_cnt); |
| 2973 | |
| 2974 | /* Build the stubs as directed by the stub hash table. */ |
| 2975 | table = &htab->bstab; |
| 2976 | bfd_hash_traverse (table, avr_build_one_stub, info); |
| 2977 | |
| 2978 | if (debug_stubs) |
| 2979 | printf ("Final Stub section Size: %i\n", (int) htab->stub_sec->size); |
| 2980 | |
| 2981 | return TRUE; |
| 2982 | } |
| 2983 | |
| 2984 | #define ELF_ARCH bfd_arch_avr |
| 2985 | #define ELF_MACHINE_CODE EM_AVR |
| 2986 | #define ELF_MACHINE_ALT1 EM_AVR_OLD |
| 2987 | #define ELF_MAXPAGESIZE 1 |
| 2988 | |
| 2989 | #define TARGET_LITTLE_SYM bfd_elf32_avr_vec |
| 2990 | #define TARGET_LITTLE_NAME "elf32-avr" |
| 2991 | |
| 2992 | #define bfd_elf32_bfd_link_hash_table_create elf32_avr_link_hash_table_create |
| 2993 | #define bfd_elf32_bfd_link_hash_table_free elf32_avr_link_hash_table_free |
| 2994 | |
| 2995 | #define elf_info_to_howto avr_info_to_howto_rela |
| 2996 | #define elf_info_to_howto_rel NULL |
| 2997 | #define elf_backend_relocate_section elf32_avr_relocate_section |
| 2998 | #define elf_backend_check_relocs elf32_avr_check_relocs |
| 2999 | #define elf_backend_can_gc_sections 1 |
| 3000 | #define elf_backend_rela_normal 1 |
| 3001 | #define elf_backend_final_write_processing \ |
| 3002 | bfd_elf_avr_final_write_processing |
| 3003 | #define elf_backend_object_p elf32_avr_object_p |
| 3004 | |
| 3005 | #define bfd_elf32_bfd_relax_section elf32_avr_relax_section |
| 3006 | #define bfd_elf32_bfd_get_relocated_section_contents \ |
| 3007 | elf32_avr_get_relocated_section_contents |
| 3008 | |
| 3009 | #include "elf32-target.h" |