| 1 | /* MMIX-specific support for 64-bit ELF. |
| 2 | Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010, 2011, |
| 3 | 2012 |
| 4 | Free Software Foundation, Inc. |
| 5 | Contributed by Hans-Peter Nilsson <hp@bitrange.com> |
| 6 | |
| 7 | This file is part of BFD, the Binary File Descriptor library. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 3 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program; if not, write to the Free Software |
| 21 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 22 | MA 02110-1301, USA. */ |
| 23 | |
| 24 | |
| 25 | /* No specific ABI or "processor-specific supplement" defined. */ |
| 26 | |
| 27 | /* TODO: |
| 28 | - "Traditional" linker relaxation (shrinking whole sections). |
| 29 | - Merge reloc stubs jumping to same location. |
| 30 | - GETA stub relaxation (call a stub for out of range new |
| 31 | R_MMIX_GETA_STUBBABLE). */ |
| 32 | |
| 33 | #include "sysdep.h" |
| 34 | #include "bfd.h" |
| 35 | #include "libbfd.h" |
| 36 | #include "elf-bfd.h" |
| 37 | #include "elf/mmix.h" |
| 38 | #include "opcode/mmix.h" |
| 39 | |
| 40 | #define MINUS_ONE (((bfd_vma) 0) - 1) |
| 41 | |
| 42 | #define MAX_PUSHJ_STUB_SIZE (5 * 4) |
| 43 | |
| 44 | /* Put these everywhere in new code. */ |
| 45 | #define FATAL_DEBUG \ |
| 46 | _bfd_abort (__FILE__, __LINE__, \ |
| 47 | "Internal: Non-debugged code (test-case missing)") |
| 48 | |
| 49 | #define BAD_CASE(x) \ |
| 50 | _bfd_abort (__FILE__, __LINE__, \ |
| 51 | "bad case for " #x) |
| 52 | |
| 53 | struct _mmix_elf_section_data |
| 54 | { |
| 55 | struct bfd_elf_section_data elf; |
| 56 | union |
| 57 | { |
| 58 | struct bpo_reloc_section_info *reloc; |
| 59 | struct bpo_greg_section_info *greg; |
| 60 | } bpo; |
| 61 | |
| 62 | struct pushj_stub_info |
| 63 | { |
| 64 | /* Maximum number of stubs needed for this section. */ |
| 65 | bfd_size_type n_pushj_relocs; |
| 66 | |
| 67 | /* Size of stubs after a mmix_elf_relax_section round. */ |
| 68 | bfd_size_type stubs_size_sum; |
| 69 | |
| 70 | /* Per-reloc stubs_size_sum information. The stubs_size_sum member is the sum |
| 71 | of these. Allocated in mmix_elf_check_common_relocs. */ |
| 72 | bfd_size_type *stub_size; |
| 73 | |
| 74 | /* Offset of next stub during relocation. Somewhat redundant with the |
| 75 | above: error coverage is easier and we don't have to reset the |
| 76 | stubs_size_sum for relocation. */ |
| 77 | bfd_size_type stub_offset; |
| 78 | } pjs; |
| 79 | |
| 80 | /* Whether there has been a warning that this section could not be |
| 81 | linked due to a specific cause. FIXME: a way to access the |
| 82 | linker info or output section, then stuff the limiter guard |
| 83 | there. */ |
| 84 | bfd_boolean has_warned_bpo; |
| 85 | bfd_boolean has_warned_pushj; |
| 86 | }; |
| 87 | |
| 88 | #define mmix_elf_section_data(sec) \ |
| 89 | ((struct _mmix_elf_section_data *) elf_section_data (sec)) |
| 90 | |
| 91 | /* For each section containing a base-plus-offset (BPO) reloc, we attach |
| 92 | this struct as mmix_elf_section_data (section)->bpo, which is otherwise |
| 93 | NULL. */ |
| 94 | struct bpo_reloc_section_info |
| 95 | { |
| 96 | /* The base is 1; this is the first number in this section. */ |
| 97 | size_t first_base_plus_offset_reloc; |
| 98 | |
| 99 | /* Number of BPO-relocs in this section. */ |
| 100 | size_t n_bpo_relocs_this_section; |
| 101 | |
| 102 | /* Running index, used at relocation time. */ |
| 103 | size_t bpo_index; |
| 104 | |
| 105 | /* We don't have access to the bfd_link_info struct in |
| 106 | mmix_final_link_relocate. What we really want to get at is the |
| 107 | global single struct greg_relocation, so we stash it here. */ |
| 108 | asection *bpo_greg_section; |
| 109 | }; |
| 110 | |
| 111 | /* Helper struct (in global context) for the one below. |
| 112 | There's one of these created for every BPO reloc. */ |
| 113 | struct bpo_reloc_request |
| 114 | { |
| 115 | bfd_vma value; |
| 116 | |
| 117 | /* Valid after relaxation. The base is 0; the first register number |
| 118 | must be added. The offset is in range 0..255. */ |
| 119 | size_t regindex; |
| 120 | size_t offset; |
| 121 | |
| 122 | /* The order number for this BPO reloc, corresponding to the order in |
| 123 | which BPO relocs were found. Used to create an index after reloc |
| 124 | requests are sorted. */ |
| 125 | size_t bpo_reloc_no; |
| 126 | |
| 127 | /* Set when the value is computed. Better than coding "guard values" |
| 128 | into the other members. Is FALSE only for BPO relocs in a GC:ed |
| 129 | section. */ |
| 130 | bfd_boolean valid; |
| 131 | }; |
| 132 | |
| 133 | /* We attach this as mmix_elf_section_data (sec)->bpo in the linker-allocated |
| 134 | greg contents section (MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME), |
| 135 | which is linked into the register contents section |
| 136 | (MMIX_REG_CONTENTS_SECTION_NAME). This section is created by the |
| 137 | linker; using the same hook as for usual with BPO relocs does not |
| 138 | collide. */ |
| 139 | struct bpo_greg_section_info |
| 140 | { |
| 141 | /* After GC, this reflects the number of remaining, non-excluded |
| 142 | BPO-relocs. */ |
| 143 | size_t n_bpo_relocs; |
| 144 | |
| 145 | /* This is the number of allocated bpo_reloc_requests; the size of |
| 146 | sorted_indexes. Valid after the check.*relocs functions are called |
| 147 | for all incoming sections. It includes the number of BPO relocs in |
| 148 | sections that were GC:ed. */ |
| 149 | size_t n_max_bpo_relocs; |
| 150 | |
| 151 | /* A counter used to find out when to fold the BPO gregs, since we |
| 152 | don't have a single "after-relaxation" hook. */ |
| 153 | size_t n_remaining_bpo_relocs_this_relaxation_round; |
| 154 | |
| 155 | /* The number of linker-allocated GREGs resulting from BPO relocs. |
| 156 | This is an approximation after _bfd_mmix_before_linker_allocation |
| 157 | and supposedly accurate after mmix_elf_relax_section is called for |
| 158 | all incoming non-collected sections. */ |
| 159 | size_t n_allocated_bpo_gregs; |
| 160 | |
| 161 | /* Index into reloc_request[], sorted on increasing "value", secondary |
| 162 | by increasing index for strict sorting order. */ |
| 163 | size_t *bpo_reloc_indexes; |
| 164 | |
| 165 | /* An array of all relocations, with the "value" member filled in by |
| 166 | the relaxation function. */ |
| 167 | struct bpo_reloc_request *reloc_request; |
| 168 | }; |
| 169 | |
| 170 | |
| 171 | extern bfd_boolean mmix_elf_final_link (bfd *, struct bfd_link_info *); |
| 172 | |
| 173 | extern void mmix_elf_symbol_processing (bfd *, asymbol *); |
| 174 | |
| 175 | /* Only intended to be called from a debugger. */ |
| 176 | extern void mmix_dump_bpo_gregs |
| 177 | (struct bfd_link_info *, bfd_error_handler_type); |
| 178 | |
| 179 | static void |
| 180 | mmix_set_relaxable_size (bfd *, asection *, void *); |
| 181 | static bfd_reloc_status_type |
| 182 | mmix_elf_reloc (bfd *, arelent *, asymbol *, void *, |
| 183 | asection *, bfd *, char **); |
| 184 | static bfd_reloc_status_type |
| 185 | mmix_final_link_relocate (reloc_howto_type *, asection *, bfd_byte *, bfd_vma, |
| 186 | bfd_signed_vma, bfd_vma, const char *, asection *, |
| 187 | char **); |
| 188 | |
| 189 | |
| 190 | /* Watch out: this currently needs to have elements with the same index as |
| 191 | their R_MMIX_ number. */ |
| 192 | static reloc_howto_type elf_mmix_howto_table[] = |
| 193 | { |
| 194 | /* This reloc does nothing. */ |
| 195 | HOWTO (R_MMIX_NONE, /* type */ |
| 196 | 0, /* rightshift */ |
| 197 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 198 | 32, /* bitsize */ |
| 199 | FALSE, /* pc_relative */ |
| 200 | 0, /* bitpos */ |
| 201 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 202 | bfd_elf_generic_reloc, /* special_function */ |
| 203 | "R_MMIX_NONE", /* name */ |
| 204 | FALSE, /* partial_inplace */ |
| 205 | 0, /* src_mask */ |
| 206 | 0, /* dst_mask */ |
| 207 | FALSE), /* pcrel_offset */ |
| 208 | |
| 209 | /* An 8 bit absolute relocation. */ |
| 210 | HOWTO (R_MMIX_8, /* type */ |
| 211 | 0, /* rightshift */ |
| 212 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 213 | 8, /* bitsize */ |
| 214 | FALSE, /* pc_relative */ |
| 215 | 0, /* bitpos */ |
| 216 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 217 | bfd_elf_generic_reloc, /* special_function */ |
| 218 | "R_MMIX_8", /* name */ |
| 219 | FALSE, /* partial_inplace */ |
| 220 | 0, /* src_mask */ |
| 221 | 0xff, /* dst_mask */ |
| 222 | FALSE), /* pcrel_offset */ |
| 223 | |
| 224 | /* An 16 bit absolute relocation. */ |
| 225 | HOWTO (R_MMIX_16, /* type */ |
| 226 | 0, /* rightshift */ |
| 227 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 228 | 16, /* bitsize */ |
| 229 | FALSE, /* pc_relative */ |
| 230 | 0, /* bitpos */ |
| 231 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 232 | bfd_elf_generic_reloc, /* special_function */ |
| 233 | "R_MMIX_16", /* name */ |
| 234 | FALSE, /* partial_inplace */ |
| 235 | 0, /* src_mask */ |
| 236 | 0xffff, /* dst_mask */ |
| 237 | FALSE), /* pcrel_offset */ |
| 238 | |
| 239 | /* An 24 bit absolute relocation. */ |
| 240 | HOWTO (R_MMIX_24, /* type */ |
| 241 | 0, /* rightshift */ |
| 242 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 243 | 24, /* bitsize */ |
| 244 | FALSE, /* pc_relative */ |
| 245 | 0, /* bitpos */ |
| 246 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 247 | bfd_elf_generic_reloc, /* special_function */ |
| 248 | "R_MMIX_24", /* name */ |
| 249 | FALSE, /* partial_inplace */ |
| 250 | ~0xffffff, /* src_mask */ |
| 251 | 0xffffff, /* dst_mask */ |
| 252 | FALSE), /* pcrel_offset */ |
| 253 | |
| 254 | /* A 32 bit absolute relocation. */ |
| 255 | HOWTO (R_MMIX_32, /* type */ |
| 256 | 0, /* rightshift */ |
| 257 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 258 | 32, /* bitsize */ |
| 259 | FALSE, /* pc_relative */ |
| 260 | 0, /* bitpos */ |
| 261 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 262 | bfd_elf_generic_reloc, /* special_function */ |
| 263 | "R_MMIX_32", /* name */ |
| 264 | FALSE, /* partial_inplace */ |
| 265 | 0, /* src_mask */ |
| 266 | 0xffffffff, /* dst_mask */ |
| 267 | FALSE), /* pcrel_offset */ |
| 268 | |
| 269 | /* 64 bit relocation. */ |
| 270 | HOWTO (R_MMIX_64, /* type */ |
| 271 | 0, /* rightshift */ |
| 272 | 4, /* size (0 = byte, 1 = short, 2 = long) */ |
| 273 | 64, /* bitsize */ |
| 274 | FALSE, /* pc_relative */ |
| 275 | 0, /* bitpos */ |
| 276 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 277 | bfd_elf_generic_reloc, /* special_function */ |
| 278 | "R_MMIX_64", /* name */ |
| 279 | FALSE, /* partial_inplace */ |
| 280 | 0, /* src_mask */ |
| 281 | MINUS_ONE, /* dst_mask */ |
| 282 | FALSE), /* pcrel_offset */ |
| 283 | |
| 284 | /* An 8 bit PC-relative relocation. */ |
| 285 | HOWTO (R_MMIX_PC_8, /* type */ |
| 286 | 0, /* rightshift */ |
| 287 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 288 | 8, /* bitsize */ |
| 289 | TRUE, /* pc_relative */ |
| 290 | 0, /* bitpos */ |
| 291 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 292 | bfd_elf_generic_reloc, /* special_function */ |
| 293 | "R_MMIX_PC_8", /* name */ |
| 294 | FALSE, /* partial_inplace */ |
| 295 | 0, /* src_mask */ |
| 296 | 0xff, /* dst_mask */ |
| 297 | TRUE), /* pcrel_offset */ |
| 298 | |
| 299 | /* An 16 bit PC-relative relocation. */ |
| 300 | HOWTO (R_MMIX_PC_16, /* type */ |
| 301 | 0, /* rightshift */ |
| 302 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 303 | 16, /* bitsize */ |
| 304 | TRUE, /* pc_relative */ |
| 305 | 0, /* bitpos */ |
| 306 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 307 | bfd_elf_generic_reloc, /* special_function */ |
| 308 | "R_MMIX_PC_16", /* name */ |
| 309 | FALSE, /* partial_inplace */ |
| 310 | 0, /* src_mask */ |
| 311 | 0xffff, /* dst_mask */ |
| 312 | TRUE), /* pcrel_offset */ |
| 313 | |
| 314 | /* An 24 bit PC-relative relocation. */ |
| 315 | HOWTO (R_MMIX_PC_24, /* type */ |
| 316 | 0, /* rightshift */ |
| 317 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 318 | 24, /* bitsize */ |
| 319 | TRUE, /* pc_relative */ |
| 320 | 0, /* bitpos */ |
| 321 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 322 | bfd_elf_generic_reloc, /* special_function */ |
| 323 | "R_MMIX_PC_24", /* name */ |
| 324 | FALSE, /* partial_inplace */ |
| 325 | ~0xffffff, /* src_mask */ |
| 326 | 0xffffff, /* dst_mask */ |
| 327 | TRUE), /* pcrel_offset */ |
| 328 | |
| 329 | /* A 32 bit absolute PC-relative relocation. */ |
| 330 | HOWTO (R_MMIX_PC_32, /* type */ |
| 331 | 0, /* rightshift */ |
| 332 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 333 | 32, /* bitsize */ |
| 334 | TRUE, /* pc_relative */ |
| 335 | 0, /* bitpos */ |
| 336 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 337 | bfd_elf_generic_reloc, /* special_function */ |
| 338 | "R_MMIX_PC_32", /* name */ |
| 339 | FALSE, /* partial_inplace */ |
| 340 | 0, /* src_mask */ |
| 341 | 0xffffffff, /* dst_mask */ |
| 342 | TRUE), /* pcrel_offset */ |
| 343 | |
| 344 | /* 64 bit PC-relative relocation. */ |
| 345 | HOWTO (R_MMIX_PC_64, /* type */ |
| 346 | 0, /* rightshift */ |
| 347 | 4, /* size (0 = byte, 1 = short, 2 = long) */ |
| 348 | 64, /* bitsize */ |
| 349 | TRUE, /* pc_relative */ |
| 350 | 0, /* bitpos */ |
| 351 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 352 | bfd_elf_generic_reloc, /* special_function */ |
| 353 | "R_MMIX_PC_64", /* name */ |
| 354 | FALSE, /* partial_inplace */ |
| 355 | 0, /* src_mask */ |
| 356 | MINUS_ONE, /* dst_mask */ |
| 357 | TRUE), /* pcrel_offset */ |
| 358 | |
| 359 | /* GNU extension to record C++ vtable hierarchy. */ |
| 360 | HOWTO (R_MMIX_GNU_VTINHERIT, /* type */ |
| 361 | 0, /* rightshift */ |
| 362 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 363 | 0, /* bitsize */ |
| 364 | FALSE, /* pc_relative */ |
| 365 | 0, /* bitpos */ |
| 366 | complain_overflow_dont, /* complain_on_overflow */ |
| 367 | NULL, /* special_function */ |
| 368 | "R_MMIX_GNU_VTINHERIT", /* name */ |
| 369 | FALSE, /* partial_inplace */ |
| 370 | 0, /* src_mask */ |
| 371 | 0, /* dst_mask */ |
| 372 | TRUE), /* pcrel_offset */ |
| 373 | |
| 374 | /* GNU extension to record C++ vtable member usage. */ |
| 375 | HOWTO (R_MMIX_GNU_VTENTRY, /* type */ |
| 376 | 0, /* rightshift */ |
| 377 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 378 | 0, /* bitsize */ |
| 379 | FALSE, /* pc_relative */ |
| 380 | 0, /* bitpos */ |
| 381 | complain_overflow_dont, /* complain_on_overflow */ |
| 382 | _bfd_elf_rel_vtable_reloc_fn, /* special_function */ |
| 383 | "R_MMIX_GNU_VTENTRY", /* name */ |
| 384 | FALSE, /* partial_inplace */ |
| 385 | 0, /* src_mask */ |
| 386 | 0, /* dst_mask */ |
| 387 | FALSE), /* pcrel_offset */ |
| 388 | |
| 389 | /* The GETA relocation is supposed to get any address that could |
| 390 | possibly be reached by the GETA instruction. It can silently expand |
| 391 | to get a 64-bit operand, but will complain if any of the two least |
| 392 | significant bits are set. The howto members reflect a simple GETA. */ |
| 393 | HOWTO (R_MMIX_GETA, /* type */ |
| 394 | 2, /* rightshift */ |
| 395 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 396 | 19, /* bitsize */ |
| 397 | TRUE, /* pc_relative */ |
| 398 | 0, /* bitpos */ |
| 399 | complain_overflow_signed, /* complain_on_overflow */ |
| 400 | mmix_elf_reloc, /* special_function */ |
| 401 | "R_MMIX_GETA", /* name */ |
| 402 | FALSE, /* partial_inplace */ |
| 403 | ~0x0100ffff, /* src_mask */ |
| 404 | 0x0100ffff, /* dst_mask */ |
| 405 | TRUE), /* pcrel_offset */ |
| 406 | |
| 407 | HOWTO (R_MMIX_GETA_1, /* type */ |
| 408 | 2, /* rightshift */ |
| 409 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 410 | 19, /* bitsize */ |
| 411 | TRUE, /* pc_relative */ |
| 412 | 0, /* bitpos */ |
| 413 | complain_overflow_signed, /* complain_on_overflow */ |
| 414 | mmix_elf_reloc, /* special_function */ |
| 415 | "R_MMIX_GETA_1", /* name */ |
| 416 | FALSE, /* partial_inplace */ |
| 417 | ~0x0100ffff, /* src_mask */ |
| 418 | 0x0100ffff, /* dst_mask */ |
| 419 | TRUE), /* pcrel_offset */ |
| 420 | |
| 421 | HOWTO (R_MMIX_GETA_2, /* type */ |
| 422 | 2, /* rightshift */ |
| 423 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 424 | 19, /* bitsize */ |
| 425 | TRUE, /* pc_relative */ |
| 426 | 0, /* bitpos */ |
| 427 | complain_overflow_signed, /* complain_on_overflow */ |
| 428 | mmix_elf_reloc, /* special_function */ |
| 429 | "R_MMIX_GETA_2", /* name */ |
| 430 | FALSE, /* partial_inplace */ |
| 431 | ~0x0100ffff, /* src_mask */ |
| 432 | 0x0100ffff, /* dst_mask */ |
| 433 | TRUE), /* pcrel_offset */ |
| 434 | |
| 435 | HOWTO (R_MMIX_GETA_3, /* type */ |
| 436 | 2, /* rightshift */ |
| 437 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 438 | 19, /* bitsize */ |
| 439 | TRUE, /* pc_relative */ |
| 440 | 0, /* bitpos */ |
| 441 | complain_overflow_signed, /* complain_on_overflow */ |
| 442 | mmix_elf_reloc, /* special_function */ |
| 443 | "R_MMIX_GETA_3", /* name */ |
| 444 | FALSE, /* partial_inplace */ |
| 445 | ~0x0100ffff, /* src_mask */ |
| 446 | 0x0100ffff, /* dst_mask */ |
| 447 | TRUE), /* pcrel_offset */ |
| 448 | |
| 449 | /* The conditional branches are supposed to reach any (code) address. |
| 450 | It can silently expand to a 64-bit operand, but will emit an error if |
| 451 | any of the two least significant bits are set. The howto members |
| 452 | reflect a simple branch. */ |
| 453 | HOWTO (R_MMIX_CBRANCH, /* type */ |
| 454 | 2, /* rightshift */ |
| 455 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 456 | 19, /* bitsize */ |
| 457 | TRUE, /* pc_relative */ |
| 458 | 0, /* bitpos */ |
| 459 | complain_overflow_signed, /* complain_on_overflow */ |
| 460 | mmix_elf_reloc, /* special_function */ |
| 461 | "R_MMIX_CBRANCH", /* name */ |
| 462 | FALSE, /* partial_inplace */ |
| 463 | ~0x0100ffff, /* src_mask */ |
| 464 | 0x0100ffff, /* dst_mask */ |
| 465 | TRUE), /* pcrel_offset */ |
| 466 | |
| 467 | HOWTO (R_MMIX_CBRANCH_J, /* type */ |
| 468 | 2, /* rightshift */ |
| 469 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 470 | 19, /* bitsize */ |
| 471 | TRUE, /* pc_relative */ |
| 472 | 0, /* bitpos */ |
| 473 | complain_overflow_signed, /* complain_on_overflow */ |
| 474 | mmix_elf_reloc, /* special_function */ |
| 475 | "R_MMIX_CBRANCH_J", /* name */ |
| 476 | FALSE, /* partial_inplace */ |
| 477 | ~0x0100ffff, /* src_mask */ |
| 478 | 0x0100ffff, /* dst_mask */ |
| 479 | TRUE), /* pcrel_offset */ |
| 480 | |
| 481 | HOWTO (R_MMIX_CBRANCH_1, /* type */ |
| 482 | 2, /* rightshift */ |
| 483 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 484 | 19, /* bitsize */ |
| 485 | TRUE, /* pc_relative */ |
| 486 | 0, /* bitpos */ |
| 487 | complain_overflow_signed, /* complain_on_overflow */ |
| 488 | mmix_elf_reloc, /* special_function */ |
| 489 | "R_MMIX_CBRANCH_1", /* name */ |
| 490 | FALSE, /* partial_inplace */ |
| 491 | ~0x0100ffff, /* src_mask */ |
| 492 | 0x0100ffff, /* dst_mask */ |
| 493 | TRUE), /* pcrel_offset */ |
| 494 | |
| 495 | HOWTO (R_MMIX_CBRANCH_2, /* type */ |
| 496 | 2, /* rightshift */ |
| 497 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 498 | 19, /* bitsize */ |
| 499 | TRUE, /* pc_relative */ |
| 500 | 0, /* bitpos */ |
| 501 | complain_overflow_signed, /* complain_on_overflow */ |
| 502 | mmix_elf_reloc, /* special_function */ |
| 503 | "R_MMIX_CBRANCH_2", /* name */ |
| 504 | FALSE, /* partial_inplace */ |
| 505 | ~0x0100ffff, /* src_mask */ |
| 506 | 0x0100ffff, /* dst_mask */ |
| 507 | TRUE), /* pcrel_offset */ |
| 508 | |
| 509 | HOWTO (R_MMIX_CBRANCH_3, /* type */ |
| 510 | 2, /* rightshift */ |
| 511 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 512 | 19, /* bitsize */ |
| 513 | TRUE, /* pc_relative */ |
| 514 | 0, /* bitpos */ |
| 515 | complain_overflow_signed, /* complain_on_overflow */ |
| 516 | mmix_elf_reloc, /* special_function */ |
| 517 | "R_MMIX_CBRANCH_3", /* name */ |
| 518 | FALSE, /* partial_inplace */ |
| 519 | ~0x0100ffff, /* src_mask */ |
| 520 | 0x0100ffff, /* dst_mask */ |
| 521 | TRUE), /* pcrel_offset */ |
| 522 | |
| 523 | /* The PUSHJ instruction can reach any (code) address, as long as it's |
| 524 | the beginning of a function (no usable restriction). It can silently |
| 525 | expand to a 64-bit operand, but will emit an error if any of the two |
| 526 | least significant bits are set. It can also expand into a call to a |
| 527 | stub; see R_MMIX_PUSHJ_STUBBABLE. The howto members reflect a simple |
| 528 | PUSHJ. */ |
| 529 | HOWTO (R_MMIX_PUSHJ, /* type */ |
| 530 | 2, /* rightshift */ |
| 531 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 532 | 19, /* bitsize */ |
| 533 | TRUE, /* pc_relative */ |
| 534 | 0, /* bitpos */ |
| 535 | complain_overflow_signed, /* complain_on_overflow */ |
| 536 | mmix_elf_reloc, /* special_function */ |
| 537 | "R_MMIX_PUSHJ", /* name */ |
| 538 | FALSE, /* partial_inplace */ |
| 539 | ~0x0100ffff, /* src_mask */ |
| 540 | 0x0100ffff, /* dst_mask */ |
| 541 | TRUE), /* pcrel_offset */ |
| 542 | |
| 543 | HOWTO (R_MMIX_PUSHJ_1, /* type */ |
| 544 | 2, /* rightshift */ |
| 545 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 546 | 19, /* bitsize */ |
| 547 | TRUE, /* pc_relative */ |
| 548 | 0, /* bitpos */ |
| 549 | complain_overflow_signed, /* complain_on_overflow */ |
| 550 | mmix_elf_reloc, /* special_function */ |
| 551 | "R_MMIX_PUSHJ_1", /* name */ |
| 552 | FALSE, /* partial_inplace */ |
| 553 | ~0x0100ffff, /* src_mask */ |
| 554 | 0x0100ffff, /* dst_mask */ |
| 555 | TRUE), /* pcrel_offset */ |
| 556 | |
| 557 | HOWTO (R_MMIX_PUSHJ_2, /* type */ |
| 558 | 2, /* rightshift */ |
| 559 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 560 | 19, /* bitsize */ |
| 561 | TRUE, /* pc_relative */ |
| 562 | 0, /* bitpos */ |
| 563 | complain_overflow_signed, /* complain_on_overflow */ |
| 564 | mmix_elf_reloc, /* special_function */ |
| 565 | "R_MMIX_PUSHJ_2", /* name */ |
| 566 | FALSE, /* partial_inplace */ |
| 567 | ~0x0100ffff, /* src_mask */ |
| 568 | 0x0100ffff, /* dst_mask */ |
| 569 | TRUE), /* pcrel_offset */ |
| 570 | |
| 571 | HOWTO (R_MMIX_PUSHJ_3, /* type */ |
| 572 | 2, /* rightshift */ |
| 573 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 574 | 19, /* bitsize */ |
| 575 | TRUE, /* pc_relative */ |
| 576 | 0, /* bitpos */ |
| 577 | complain_overflow_signed, /* complain_on_overflow */ |
| 578 | mmix_elf_reloc, /* special_function */ |
| 579 | "R_MMIX_PUSHJ_3", /* name */ |
| 580 | FALSE, /* partial_inplace */ |
| 581 | ~0x0100ffff, /* src_mask */ |
| 582 | 0x0100ffff, /* dst_mask */ |
| 583 | TRUE), /* pcrel_offset */ |
| 584 | |
| 585 | /* A JMP is supposed to reach any (code) address. By itself, it can |
| 586 | reach +-64M; the expansion can reach all 64 bits. Note that the 64M |
| 587 | limit is soon reached if you link the program in wildly different |
| 588 | memory segments. The howto members reflect a trivial JMP. */ |
| 589 | HOWTO (R_MMIX_JMP, /* type */ |
| 590 | 2, /* rightshift */ |
| 591 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 592 | 27, /* bitsize */ |
| 593 | TRUE, /* pc_relative */ |
| 594 | 0, /* bitpos */ |
| 595 | complain_overflow_signed, /* complain_on_overflow */ |
| 596 | mmix_elf_reloc, /* special_function */ |
| 597 | "R_MMIX_JMP", /* name */ |
| 598 | FALSE, /* partial_inplace */ |
| 599 | ~0x1ffffff, /* src_mask */ |
| 600 | 0x1ffffff, /* dst_mask */ |
| 601 | TRUE), /* pcrel_offset */ |
| 602 | |
| 603 | HOWTO (R_MMIX_JMP_1, /* type */ |
| 604 | 2, /* rightshift */ |
| 605 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 606 | 27, /* bitsize */ |
| 607 | TRUE, /* pc_relative */ |
| 608 | 0, /* bitpos */ |
| 609 | complain_overflow_signed, /* complain_on_overflow */ |
| 610 | mmix_elf_reloc, /* special_function */ |
| 611 | "R_MMIX_JMP_1", /* name */ |
| 612 | FALSE, /* partial_inplace */ |
| 613 | ~0x1ffffff, /* src_mask */ |
| 614 | 0x1ffffff, /* dst_mask */ |
| 615 | TRUE), /* pcrel_offset */ |
| 616 | |
| 617 | HOWTO (R_MMIX_JMP_2, /* type */ |
| 618 | 2, /* rightshift */ |
| 619 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 620 | 27, /* bitsize */ |
| 621 | TRUE, /* pc_relative */ |
| 622 | 0, /* bitpos */ |
| 623 | complain_overflow_signed, /* complain_on_overflow */ |
| 624 | mmix_elf_reloc, /* special_function */ |
| 625 | "R_MMIX_JMP_2", /* name */ |
| 626 | FALSE, /* partial_inplace */ |
| 627 | ~0x1ffffff, /* src_mask */ |
| 628 | 0x1ffffff, /* dst_mask */ |
| 629 | TRUE), /* pcrel_offset */ |
| 630 | |
| 631 | HOWTO (R_MMIX_JMP_3, /* type */ |
| 632 | 2, /* rightshift */ |
| 633 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 634 | 27, /* bitsize */ |
| 635 | TRUE, /* pc_relative */ |
| 636 | 0, /* bitpos */ |
| 637 | complain_overflow_signed, /* complain_on_overflow */ |
| 638 | mmix_elf_reloc, /* special_function */ |
| 639 | "R_MMIX_JMP_3", /* name */ |
| 640 | FALSE, /* partial_inplace */ |
| 641 | ~0x1ffffff, /* src_mask */ |
| 642 | 0x1ffffff, /* dst_mask */ |
| 643 | TRUE), /* pcrel_offset */ |
| 644 | |
| 645 | /* When we don't emit link-time-relaxable code from the assembler, or |
| 646 | when relaxation has done all it can do, these relocs are used. For |
| 647 | GETA/PUSHJ/branches. */ |
| 648 | HOWTO (R_MMIX_ADDR19, /* type */ |
| 649 | 2, /* rightshift */ |
| 650 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 651 | 19, /* bitsize */ |
| 652 | TRUE, /* pc_relative */ |
| 653 | 0, /* bitpos */ |
| 654 | complain_overflow_signed, /* complain_on_overflow */ |
| 655 | mmix_elf_reloc, /* special_function */ |
| 656 | "R_MMIX_ADDR19", /* name */ |
| 657 | FALSE, /* partial_inplace */ |
| 658 | ~0x0100ffff, /* src_mask */ |
| 659 | 0x0100ffff, /* dst_mask */ |
| 660 | TRUE), /* pcrel_offset */ |
| 661 | |
| 662 | /* For JMP. */ |
| 663 | HOWTO (R_MMIX_ADDR27, /* type */ |
| 664 | 2, /* rightshift */ |
| 665 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 666 | 27, /* bitsize */ |
| 667 | TRUE, /* pc_relative */ |
| 668 | 0, /* bitpos */ |
| 669 | complain_overflow_signed, /* complain_on_overflow */ |
| 670 | mmix_elf_reloc, /* special_function */ |
| 671 | "R_MMIX_ADDR27", /* name */ |
| 672 | FALSE, /* partial_inplace */ |
| 673 | ~0x1ffffff, /* src_mask */ |
| 674 | 0x1ffffff, /* dst_mask */ |
| 675 | TRUE), /* pcrel_offset */ |
| 676 | |
| 677 | /* A general register or the value 0..255. If a value, then the |
| 678 | instruction (offset -3) needs adjusting. */ |
| 679 | HOWTO (R_MMIX_REG_OR_BYTE, /* type */ |
| 680 | 0, /* rightshift */ |
| 681 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 682 | 8, /* bitsize */ |
| 683 | FALSE, /* pc_relative */ |
| 684 | 0, /* bitpos */ |
| 685 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 686 | mmix_elf_reloc, /* special_function */ |
| 687 | "R_MMIX_REG_OR_BYTE", /* name */ |
| 688 | FALSE, /* partial_inplace */ |
| 689 | 0, /* src_mask */ |
| 690 | 0xff, /* dst_mask */ |
| 691 | FALSE), /* pcrel_offset */ |
| 692 | |
| 693 | /* A general register. */ |
| 694 | HOWTO (R_MMIX_REG, /* type */ |
| 695 | 0, /* rightshift */ |
| 696 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 697 | 8, /* bitsize */ |
| 698 | FALSE, /* pc_relative */ |
| 699 | 0, /* bitpos */ |
| 700 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 701 | mmix_elf_reloc, /* special_function */ |
| 702 | "R_MMIX_REG", /* name */ |
| 703 | FALSE, /* partial_inplace */ |
| 704 | 0, /* src_mask */ |
| 705 | 0xff, /* dst_mask */ |
| 706 | FALSE), /* pcrel_offset */ |
| 707 | |
| 708 | /* A register plus an index, corresponding to the relocation expression. |
| 709 | The sizes must correspond to the valid range of the expression, while |
| 710 | the bitmasks correspond to what we store in the image. */ |
| 711 | HOWTO (R_MMIX_BASE_PLUS_OFFSET, /* type */ |
| 712 | 0, /* rightshift */ |
| 713 | 4, /* size (0 = byte, 1 = short, 2 = long) */ |
| 714 | 64, /* bitsize */ |
| 715 | FALSE, /* pc_relative */ |
| 716 | 0, /* bitpos */ |
| 717 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 718 | mmix_elf_reloc, /* special_function */ |
| 719 | "R_MMIX_BASE_PLUS_OFFSET", /* name */ |
| 720 | FALSE, /* partial_inplace */ |
| 721 | 0, /* src_mask */ |
| 722 | 0xffff, /* dst_mask */ |
| 723 | FALSE), /* pcrel_offset */ |
| 724 | |
| 725 | /* A "magic" relocation for a LOCAL expression, asserting that the |
| 726 | expression is less than the number of global registers. No actual |
| 727 | modification of the contents is done. Implementing this as a |
| 728 | relocation was less intrusive than e.g. putting such expressions in a |
| 729 | section to discard *after* relocation. */ |
| 730 | HOWTO (R_MMIX_LOCAL, /* type */ |
| 731 | 0, /* rightshift */ |
| 732 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 733 | 0, /* bitsize */ |
| 734 | FALSE, /* pc_relative */ |
| 735 | 0, /* bitpos */ |
| 736 | complain_overflow_dont, /* complain_on_overflow */ |
| 737 | mmix_elf_reloc, /* special_function */ |
| 738 | "R_MMIX_LOCAL", /* name */ |
| 739 | FALSE, /* partial_inplace */ |
| 740 | 0, /* src_mask */ |
| 741 | 0, /* dst_mask */ |
| 742 | FALSE), /* pcrel_offset */ |
| 743 | |
| 744 | HOWTO (R_MMIX_PUSHJ_STUBBABLE, /* type */ |
| 745 | 2, /* rightshift */ |
| 746 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 747 | 19, /* bitsize */ |
| 748 | TRUE, /* pc_relative */ |
| 749 | 0, /* bitpos */ |
| 750 | complain_overflow_signed, /* complain_on_overflow */ |
| 751 | mmix_elf_reloc, /* special_function */ |
| 752 | "R_MMIX_PUSHJ_STUBBABLE", /* name */ |
| 753 | FALSE, /* partial_inplace */ |
| 754 | ~0x0100ffff, /* src_mask */ |
| 755 | 0x0100ffff, /* dst_mask */ |
| 756 | TRUE) /* pcrel_offset */ |
| 757 | }; |
| 758 | |
| 759 | |
| 760 | /* Map BFD reloc types to MMIX ELF reloc types. */ |
| 761 | |
| 762 | struct mmix_reloc_map |
| 763 | { |
| 764 | bfd_reloc_code_real_type bfd_reloc_val; |
| 765 | enum elf_mmix_reloc_type elf_reloc_val; |
| 766 | }; |
| 767 | |
| 768 | |
| 769 | static const struct mmix_reloc_map mmix_reloc_map[] = |
| 770 | { |
| 771 | {BFD_RELOC_NONE, R_MMIX_NONE}, |
| 772 | {BFD_RELOC_8, R_MMIX_8}, |
| 773 | {BFD_RELOC_16, R_MMIX_16}, |
| 774 | {BFD_RELOC_24, R_MMIX_24}, |
| 775 | {BFD_RELOC_32, R_MMIX_32}, |
| 776 | {BFD_RELOC_64, R_MMIX_64}, |
| 777 | {BFD_RELOC_8_PCREL, R_MMIX_PC_8}, |
| 778 | {BFD_RELOC_16_PCREL, R_MMIX_PC_16}, |
| 779 | {BFD_RELOC_24_PCREL, R_MMIX_PC_24}, |
| 780 | {BFD_RELOC_32_PCREL, R_MMIX_PC_32}, |
| 781 | {BFD_RELOC_64_PCREL, R_MMIX_PC_64}, |
| 782 | {BFD_RELOC_VTABLE_INHERIT, R_MMIX_GNU_VTINHERIT}, |
| 783 | {BFD_RELOC_VTABLE_ENTRY, R_MMIX_GNU_VTENTRY}, |
| 784 | {BFD_RELOC_MMIX_GETA, R_MMIX_GETA}, |
| 785 | {BFD_RELOC_MMIX_CBRANCH, R_MMIX_CBRANCH}, |
| 786 | {BFD_RELOC_MMIX_PUSHJ, R_MMIX_PUSHJ}, |
| 787 | {BFD_RELOC_MMIX_JMP, R_MMIX_JMP}, |
| 788 | {BFD_RELOC_MMIX_ADDR19, R_MMIX_ADDR19}, |
| 789 | {BFD_RELOC_MMIX_ADDR27, R_MMIX_ADDR27}, |
| 790 | {BFD_RELOC_MMIX_REG_OR_BYTE, R_MMIX_REG_OR_BYTE}, |
| 791 | {BFD_RELOC_MMIX_REG, R_MMIX_REG}, |
| 792 | {BFD_RELOC_MMIX_BASE_PLUS_OFFSET, R_MMIX_BASE_PLUS_OFFSET}, |
| 793 | {BFD_RELOC_MMIX_LOCAL, R_MMIX_LOCAL}, |
| 794 | {BFD_RELOC_MMIX_PUSHJ_STUBBABLE, R_MMIX_PUSHJ_STUBBABLE} |
| 795 | }; |
| 796 | |
| 797 | static reloc_howto_type * |
| 798 | bfd_elf64_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 799 | bfd_reloc_code_real_type code) |
| 800 | { |
| 801 | unsigned int i; |
| 802 | |
| 803 | for (i = 0; |
| 804 | i < sizeof (mmix_reloc_map) / sizeof (mmix_reloc_map[0]); |
| 805 | i++) |
| 806 | { |
| 807 | if (mmix_reloc_map[i].bfd_reloc_val == code) |
| 808 | return &elf_mmix_howto_table[mmix_reloc_map[i].elf_reloc_val]; |
| 809 | } |
| 810 | |
| 811 | return NULL; |
| 812 | } |
| 813 | |
| 814 | static reloc_howto_type * |
| 815 | bfd_elf64_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 816 | const char *r_name) |
| 817 | { |
| 818 | unsigned int i; |
| 819 | |
| 820 | for (i = 0; |
| 821 | i < sizeof (elf_mmix_howto_table) / sizeof (elf_mmix_howto_table[0]); |
| 822 | i++) |
| 823 | if (elf_mmix_howto_table[i].name != NULL |
| 824 | && strcasecmp (elf_mmix_howto_table[i].name, r_name) == 0) |
| 825 | return &elf_mmix_howto_table[i]; |
| 826 | |
| 827 | return NULL; |
| 828 | } |
| 829 | |
| 830 | static bfd_boolean |
| 831 | mmix_elf_new_section_hook (bfd *abfd, asection *sec) |
| 832 | { |
| 833 | if (!sec->used_by_bfd) |
| 834 | { |
| 835 | struct _mmix_elf_section_data *sdata; |
| 836 | bfd_size_type amt = sizeof (*sdata); |
| 837 | |
| 838 | sdata = bfd_zalloc (abfd, amt); |
| 839 | if (sdata == NULL) |
| 840 | return FALSE; |
| 841 | sec->used_by_bfd = sdata; |
| 842 | } |
| 843 | |
| 844 | return _bfd_elf_new_section_hook (abfd, sec); |
| 845 | } |
| 846 | |
| 847 | |
| 848 | /* This function performs the actual bitfiddling and sanity check for a |
| 849 | final relocation. Each relocation gets its *worst*-case expansion |
| 850 | in size when it arrives here; any reduction in size should have been |
| 851 | caught in linker relaxation earlier. When we get here, the relocation |
| 852 | looks like the smallest instruction with SWYM:s (nop:s) appended to the |
| 853 | max size. We fill in those nop:s. |
| 854 | |
| 855 | R_MMIX_GETA: (FIXME: Relaxation should break this up in 1, 2, 3 tetra) |
| 856 | GETA $N,foo |
| 857 | -> |
| 858 | SETL $N,foo & 0xffff |
| 859 | INCML $N,(foo >> 16) & 0xffff |
| 860 | INCMH $N,(foo >> 32) & 0xffff |
| 861 | INCH $N,(foo >> 48) & 0xffff |
| 862 | |
| 863 | R_MMIX_CBRANCH: (FIXME: Relaxation should break this up, but |
| 864 | condbranches needing relaxation might be rare enough to not be |
| 865 | worthwhile.) |
| 866 | [P]Bcc $N,foo |
| 867 | -> |
| 868 | [~P]B~cc $N,.+20 |
| 869 | SETL $255,foo & ... |
| 870 | INCML ... |
| 871 | INCMH ... |
| 872 | INCH ... |
| 873 | GO $255,$255,0 |
| 874 | |
| 875 | R_MMIX_PUSHJ: (FIXME: Relaxation...) |
| 876 | PUSHJ $N,foo |
| 877 | -> |
| 878 | SETL $255,foo & ... |
| 879 | INCML ... |
| 880 | INCMH ... |
| 881 | INCH ... |
| 882 | PUSHGO $N,$255,0 |
| 883 | |
| 884 | R_MMIX_JMP: (FIXME: Relaxation...) |
| 885 | JMP foo |
| 886 | -> |
| 887 | SETL $255,foo & ... |
| 888 | INCML ... |
| 889 | INCMH ... |
| 890 | INCH ... |
| 891 | GO $255,$255,0 |
| 892 | |
| 893 | R_MMIX_ADDR19 and R_MMIX_ADDR27 are just filled in. */ |
| 894 | |
| 895 | static bfd_reloc_status_type |
| 896 | mmix_elf_perform_relocation (asection *isec, reloc_howto_type *howto, |
| 897 | void *datap, bfd_vma addr, bfd_vma value, |
| 898 | char **error_message) |
| 899 | { |
| 900 | bfd *abfd = isec->owner; |
| 901 | bfd_reloc_status_type flag = bfd_reloc_ok; |
| 902 | bfd_reloc_status_type r; |
| 903 | int offs = 0; |
| 904 | int reg = 255; |
| 905 | |
| 906 | /* The worst case bits are all similar SETL/INCML/INCMH/INCH sequences. |
| 907 | We handle the differences here and the common sequence later. */ |
| 908 | switch (howto->type) |
| 909 | { |
| 910 | case R_MMIX_GETA: |
| 911 | offs = 0; |
| 912 | reg = bfd_get_8 (abfd, (bfd_byte *) datap + 1); |
| 913 | |
| 914 | /* We change to an absolute value. */ |
| 915 | value += addr; |
| 916 | break; |
| 917 | |
| 918 | case R_MMIX_CBRANCH: |
| 919 | { |
| 920 | int in1 = bfd_get_16 (abfd, (bfd_byte *) datap) << 16; |
| 921 | |
| 922 | /* Invert the condition and prediction bit, and set the offset |
| 923 | to five instructions ahead. |
| 924 | |
| 925 | We *can* do better if we want to. If the branch is found to be |
| 926 | within limits, we could leave the branch as is; there'll just |
| 927 | be a bunch of NOP:s after it. But we shouldn't see this |
| 928 | sequence often enough that it's worth doing it. */ |
| 929 | |
| 930 | bfd_put_32 (abfd, |
| 931 | (((in1 ^ ((PRED_INV_BIT | COND_INV_BIT) << 24)) & ~0xffff) |
| 932 | | (24/4)), |
| 933 | (bfd_byte *) datap); |
| 934 | |
| 935 | /* Put a "GO $255,$255,0" after the common sequence. */ |
| 936 | bfd_put_32 (abfd, |
| 937 | ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24) | 0xffff00, |
| 938 | (bfd_byte *) datap + 20); |
| 939 | |
| 940 | /* Common sequence starts at offset 4. */ |
| 941 | offs = 4; |
| 942 | |
| 943 | /* We change to an absolute value. */ |
| 944 | value += addr; |
| 945 | } |
| 946 | break; |
| 947 | |
| 948 | case R_MMIX_PUSHJ_STUBBABLE: |
| 949 | /* If the address fits, we're fine. */ |
| 950 | if ((value & 3) == 0 |
| 951 | /* Note rightshift 0; see R_MMIX_JMP case below. */ |
| 952 | && (r = bfd_check_overflow (complain_overflow_signed, |
| 953 | howto->bitsize, |
| 954 | 0, |
| 955 | bfd_arch_bits_per_address (abfd), |
| 956 | value)) == bfd_reloc_ok) |
| 957 | goto pcrel_mmix_reloc_fits; |
| 958 | else |
| 959 | { |
| 960 | bfd_size_type size = isec->rawsize ? isec->rawsize : isec->size; |
| 961 | |
| 962 | /* We have the bytes at the PUSHJ insn and need to get the |
| 963 | position for the stub. There's supposed to be room allocated |
| 964 | for the stub. */ |
| 965 | bfd_byte *stubcontents |
| 966 | = ((bfd_byte *) datap |
| 967 | - (addr - (isec->output_section->vma + isec->output_offset)) |
| 968 | + size |
| 969 | + mmix_elf_section_data (isec)->pjs.stub_offset); |
| 970 | bfd_vma stubaddr; |
| 971 | |
| 972 | if (mmix_elf_section_data (isec)->pjs.n_pushj_relocs == 0) |
| 973 | { |
| 974 | /* This shouldn't happen when linking to ELF or mmo, so |
| 975 | this is an attempt to link to "binary", right? We |
| 976 | can't access the output bfd, so we can't verify that |
| 977 | assumption. We only know that the critical |
| 978 | mmix_elf_check_common_relocs has not been called, |
| 979 | which happens when the output format is different |
| 980 | from the input format (and is not mmo). */ |
| 981 | if (! mmix_elf_section_data (isec)->has_warned_pushj) |
| 982 | { |
| 983 | /* For the first such error per input section, produce |
| 984 | a verbose message. */ |
| 985 | *error_message |
| 986 | = _("invalid input relocation when producing" |
| 987 | " non-ELF, non-mmo format output." |
| 988 | "\n Please use the objcopy program to convert from" |
| 989 | " ELF or mmo," |
| 990 | "\n or assemble using" |
| 991 | " \"-no-expand\" (for gcc, \"-Wa,-no-expand\""); |
| 992 | mmix_elf_section_data (isec)->has_warned_pushj = TRUE; |
| 993 | return bfd_reloc_dangerous; |
| 994 | } |
| 995 | |
| 996 | /* For subsequent errors, return this one, which is |
| 997 | rate-limited but looks a little bit different, |
| 998 | hopefully without affecting user-friendliness. */ |
| 999 | return bfd_reloc_overflow; |
| 1000 | } |
| 1001 | |
| 1002 | /* The address doesn't fit, so redirect the PUSHJ to the |
| 1003 | location of the stub. */ |
| 1004 | r = mmix_elf_perform_relocation (isec, |
| 1005 | &elf_mmix_howto_table |
| 1006 | [R_MMIX_ADDR19], |
| 1007 | datap, |
| 1008 | addr, |
| 1009 | isec->output_section->vma |
| 1010 | + isec->output_offset |
| 1011 | + size |
| 1012 | + (mmix_elf_section_data (isec) |
| 1013 | ->pjs.stub_offset) |
| 1014 | - addr, |
| 1015 | error_message); |
| 1016 | if (r != bfd_reloc_ok) |
| 1017 | return r; |
| 1018 | |
| 1019 | stubaddr |
| 1020 | = (isec->output_section->vma |
| 1021 | + isec->output_offset |
| 1022 | + size |
| 1023 | + mmix_elf_section_data (isec)->pjs.stub_offset); |
| 1024 | |
| 1025 | /* We generate a simple JMP if that suffices, else the whole 5 |
| 1026 | insn stub. */ |
| 1027 | if (bfd_check_overflow (complain_overflow_signed, |
| 1028 | elf_mmix_howto_table[R_MMIX_ADDR27].bitsize, |
| 1029 | 0, |
| 1030 | bfd_arch_bits_per_address (abfd), |
| 1031 | addr + value - stubaddr) == bfd_reloc_ok) |
| 1032 | { |
| 1033 | bfd_put_32 (abfd, JMP_INSN_BYTE << 24, stubcontents); |
| 1034 | r = mmix_elf_perform_relocation (isec, |
| 1035 | &elf_mmix_howto_table |
| 1036 | [R_MMIX_ADDR27], |
| 1037 | stubcontents, |
| 1038 | stubaddr, |
| 1039 | value + addr - stubaddr, |
| 1040 | error_message); |
| 1041 | mmix_elf_section_data (isec)->pjs.stub_offset += 4; |
| 1042 | |
| 1043 | if (size + mmix_elf_section_data (isec)->pjs.stub_offset |
| 1044 | > isec->size) |
| 1045 | abort (); |
| 1046 | |
| 1047 | return r; |
| 1048 | } |
| 1049 | else |
| 1050 | { |
| 1051 | /* Put a "GO $255,0" after the common sequence. */ |
| 1052 | bfd_put_32 (abfd, |
| 1053 | ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24) |
| 1054 | | 0xff00, (bfd_byte *) stubcontents + 16); |
| 1055 | |
| 1056 | /* Prepare for the general code to set the first part of the |
| 1057 | linker stub, and */ |
| 1058 | value += addr; |
| 1059 | datap = stubcontents; |
| 1060 | mmix_elf_section_data (isec)->pjs.stub_offset |
| 1061 | += MAX_PUSHJ_STUB_SIZE; |
| 1062 | } |
| 1063 | } |
| 1064 | break; |
| 1065 | |
| 1066 | case R_MMIX_PUSHJ: |
| 1067 | { |
| 1068 | int inreg = bfd_get_8 (abfd, (bfd_byte *) datap + 1); |
| 1069 | |
| 1070 | /* Put a "PUSHGO $N,$255,0" after the common sequence. */ |
| 1071 | bfd_put_32 (abfd, |
| 1072 | ((PUSHGO_INSN_BYTE | IMM_OFFSET_BIT) << 24) |
| 1073 | | (inreg << 16) |
| 1074 | | 0xff00, |
| 1075 | (bfd_byte *) datap + 16); |
| 1076 | |
| 1077 | /* We change to an absolute value. */ |
| 1078 | value += addr; |
| 1079 | } |
| 1080 | break; |
| 1081 | |
| 1082 | case R_MMIX_JMP: |
| 1083 | /* This one is a little special. If we get here on a non-relaxing |
| 1084 | link, and the destination is actually in range, we don't need to |
| 1085 | execute the nops. |
| 1086 | If so, we fall through to the bit-fiddling relocs. |
| 1087 | |
| 1088 | FIXME: bfd_check_overflow seems broken; the relocation is |
| 1089 | rightshifted before testing, so supply a zero rightshift. */ |
| 1090 | |
| 1091 | if (! ((value & 3) == 0 |
| 1092 | && (r = bfd_check_overflow (complain_overflow_signed, |
| 1093 | howto->bitsize, |
| 1094 | 0, |
| 1095 | bfd_arch_bits_per_address (abfd), |
| 1096 | value)) == bfd_reloc_ok)) |
| 1097 | { |
| 1098 | /* If the relocation doesn't fit in a JMP, we let the NOP:s be |
| 1099 | modified below, and put a "GO $255,$255,0" after the |
| 1100 | address-loading sequence. */ |
| 1101 | bfd_put_32 (abfd, |
| 1102 | ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24) |
| 1103 | | 0xffff00, |
| 1104 | (bfd_byte *) datap + 16); |
| 1105 | |
| 1106 | /* We change to an absolute value. */ |
| 1107 | value += addr; |
| 1108 | break; |
| 1109 | } |
| 1110 | /* FALLTHROUGH. */ |
| 1111 | case R_MMIX_ADDR19: |
| 1112 | case R_MMIX_ADDR27: |
| 1113 | pcrel_mmix_reloc_fits: |
| 1114 | /* These must be in range, or else we emit an error. */ |
| 1115 | if ((value & 3) == 0 |
| 1116 | /* Note rightshift 0; see above. */ |
| 1117 | && (r = bfd_check_overflow (complain_overflow_signed, |
| 1118 | howto->bitsize, |
| 1119 | 0, |
| 1120 | bfd_arch_bits_per_address (abfd), |
| 1121 | value)) == bfd_reloc_ok) |
| 1122 | { |
| 1123 | bfd_vma in1 |
| 1124 | = bfd_get_32 (abfd, (bfd_byte *) datap); |
| 1125 | bfd_vma highbit; |
| 1126 | |
| 1127 | if ((bfd_signed_vma) value < 0) |
| 1128 | { |
| 1129 | highbit = 1 << 24; |
| 1130 | value += (1 << (howto->bitsize - 1)); |
| 1131 | } |
| 1132 | else |
| 1133 | highbit = 0; |
| 1134 | |
| 1135 | value >>= 2; |
| 1136 | |
| 1137 | bfd_put_32 (abfd, |
| 1138 | (in1 & howto->src_mask) |
| 1139 | | highbit |
| 1140 | | (value & howto->dst_mask), |
| 1141 | (bfd_byte *) datap); |
| 1142 | |
| 1143 | return bfd_reloc_ok; |
| 1144 | } |
| 1145 | else |
| 1146 | return bfd_reloc_overflow; |
| 1147 | |
| 1148 | case R_MMIX_BASE_PLUS_OFFSET: |
| 1149 | { |
| 1150 | struct bpo_reloc_section_info *bpodata |
| 1151 | = mmix_elf_section_data (isec)->bpo.reloc; |
| 1152 | asection *bpo_greg_section; |
| 1153 | struct bpo_greg_section_info *gregdata; |
| 1154 | size_t bpo_index; |
| 1155 | |
| 1156 | if (bpodata == NULL) |
| 1157 | { |
| 1158 | /* This shouldn't happen when linking to ELF or mmo, so |
| 1159 | this is an attempt to link to "binary", right? We |
| 1160 | can't access the output bfd, so we can't verify that |
| 1161 | assumption. We only know that the critical |
| 1162 | mmix_elf_check_common_relocs has not been called, which |
| 1163 | happens when the output format is different from the |
| 1164 | input format (and is not mmo). */ |
| 1165 | if (! mmix_elf_section_data (isec)->has_warned_bpo) |
| 1166 | { |
| 1167 | /* For the first such error per input section, produce |
| 1168 | a verbose message. */ |
| 1169 | *error_message |
| 1170 | = _("invalid input relocation when producing" |
| 1171 | " non-ELF, non-mmo format output." |
| 1172 | "\n Please use the objcopy program to convert from" |
| 1173 | " ELF or mmo," |
| 1174 | "\n or compile using the gcc-option" |
| 1175 | " \"-mno-base-addresses\"."); |
| 1176 | mmix_elf_section_data (isec)->has_warned_bpo = TRUE; |
| 1177 | return bfd_reloc_dangerous; |
| 1178 | } |
| 1179 | |
| 1180 | /* For subsequent errors, return this one, which is |
| 1181 | rate-limited but looks a little bit different, |
| 1182 | hopefully without affecting user-friendliness. */ |
| 1183 | return bfd_reloc_overflow; |
| 1184 | } |
| 1185 | |
| 1186 | bpo_greg_section = bpodata->bpo_greg_section; |
| 1187 | gregdata = mmix_elf_section_data (bpo_greg_section)->bpo.greg; |
| 1188 | bpo_index = gregdata->bpo_reloc_indexes[bpodata->bpo_index++]; |
| 1189 | |
| 1190 | /* A consistency check: The value we now have in "relocation" must |
| 1191 | be the same as the value we stored for that relocation. It |
| 1192 | doesn't cost much, so can be left in at all times. */ |
| 1193 | if (value != gregdata->reloc_request[bpo_index].value) |
| 1194 | { |
| 1195 | (*_bfd_error_handler) |
| 1196 | (_("%s: Internal inconsistency error for value for\n\ |
| 1197 | linker-allocated global register: linked: 0x%lx%08lx != relaxed: 0x%lx%08lx\n"), |
| 1198 | bfd_get_filename (isec->owner), |
| 1199 | (unsigned long) (value >> 32), (unsigned long) value, |
| 1200 | (unsigned long) (gregdata->reloc_request[bpo_index].value |
| 1201 | >> 32), |
| 1202 | (unsigned long) gregdata->reloc_request[bpo_index].value); |
| 1203 | bfd_set_error (bfd_error_bad_value); |
| 1204 | return bfd_reloc_overflow; |
| 1205 | } |
| 1206 | |
| 1207 | /* Then store the register number and offset for that register |
| 1208 | into datap and datap + 1 respectively. */ |
| 1209 | bfd_put_8 (abfd, |
| 1210 | gregdata->reloc_request[bpo_index].regindex |
| 1211 | + bpo_greg_section->output_section->vma / 8, |
| 1212 | datap); |
| 1213 | bfd_put_8 (abfd, |
| 1214 | gregdata->reloc_request[bpo_index].offset, |
| 1215 | ((unsigned char *) datap) + 1); |
| 1216 | return bfd_reloc_ok; |
| 1217 | } |
| 1218 | |
| 1219 | case R_MMIX_REG_OR_BYTE: |
| 1220 | case R_MMIX_REG: |
| 1221 | if (value > 255) |
| 1222 | return bfd_reloc_overflow; |
| 1223 | bfd_put_8 (abfd, value, datap); |
| 1224 | return bfd_reloc_ok; |
| 1225 | |
| 1226 | default: |
| 1227 | BAD_CASE (howto->type); |
| 1228 | } |
| 1229 | |
| 1230 | /* This code adds the common SETL/INCML/INCMH/INCH worst-case |
| 1231 | sequence. */ |
| 1232 | |
| 1233 | /* Lowest two bits must be 0. We return bfd_reloc_overflow for |
| 1234 | everything that looks strange. */ |
| 1235 | if (value & 3) |
| 1236 | flag = bfd_reloc_overflow; |
| 1237 | |
| 1238 | bfd_put_32 (abfd, |
| 1239 | (SETL_INSN_BYTE << 24) | (value & 0xffff) | (reg << 16), |
| 1240 | (bfd_byte *) datap + offs); |
| 1241 | bfd_put_32 (abfd, |
| 1242 | (INCML_INSN_BYTE << 24) | ((value >> 16) & 0xffff) | (reg << 16), |
| 1243 | (bfd_byte *) datap + offs + 4); |
| 1244 | bfd_put_32 (abfd, |
| 1245 | (INCMH_INSN_BYTE << 24) | ((value >> 32) & 0xffff) | (reg << 16), |
| 1246 | (bfd_byte *) datap + offs + 8); |
| 1247 | bfd_put_32 (abfd, |
| 1248 | (INCH_INSN_BYTE << 24) | ((value >> 48) & 0xffff) | (reg << 16), |
| 1249 | (bfd_byte *) datap + offs + 12); |
| 1250 | |
| 1251 | return flag; |
| 1252 | } |
| 1253 | |
| 1254 | /* Set the howto pointer for an MMIX ELF reloc (type RELA). */ |
| 1255 | |
| 1256 | static void |
| 1257 | mmix_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED, |
| 1258 | arelent *cache_ptr, |
| 1259 | Elf_Internal_Rela *dst) |
| 1260 | { |
| 1261 | unsigned int r_type; |
| 1262 | |
| 1263 | r_type = ELF64_R_TYPE (dst->r_info); |
| 1264 | BFD_ASSERT (r_type < (unsigned int) R_MMIX_max); |
| 1265 | cache_ptr->howto = &elf_mmix_howto_table[r_type]; |
| 1266 | } |
| 1267 | |
| 1268 | /* Any MMIX-specific relocation gets here at assembly time or when linking |
| 1269 | to other formats (such as mmo); this is the relocation function from |
| 1270 | the reloc_table. We don't get here for final pure ELF linking. */ |
| 1271 | |
| 1272 | static bfd_reloc_status_type |
| 1273 | mmix_elf_reloc (bfd *abfd, |
| 1274 | arelent *reloc_entry, |
| 1275 | asymbol *symbol, |
| 1276 | void * data, |
| 1277 | asection *input_section, |
| 1278 | bfd *output_bfd, |
| 1279 | char **error_message) |
| 1280 | { |
| 1281 | bfd_vma relocation; |
| 1282 | bfd_reloc_status_type r; |
| 1283 | asection *reloc_target_output_section; |
| 1284 | bfd_reloc_status_type flag = bfd_reloc_ok; |
| 1285 | bfd_vma output_base = 0; |
| 1286 | |
| 1287 | r = bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, |
| 1288 | input_section, output_bfd, error_message); |
| 1289 | |
| 1290 | /* If that was all that was needed (i.e. this isn't a final link, only |
| 1291 | some segment adjustments), we're done. */ |
| 1292 | if (r != bfd_reloc_continue) |
| 1293 | return r; |
| 1294 | |
| 1295 | if (bfd_is_und_section (symbol->section) |
| 1296 | && (symbol->flags & BSF_WEAK) == 0 |
| 1297 | && output_bfd == (bfd *) NULL) |
| 1298 | return bfd_reloc_undefined; |
| 1299 | |
| 1300 | /* Is the address of the relocation really within the section? */ |
| 1301 | if (reloc_entry->address > bfd_get_section_limit (abfd, input_section)) |
| 1302 | return bfd_reloc_outofrange; |
| 1303 | |
| 1304 | /* Work out which section the relocation is targeted at and the |
| 1305 | initial relocation command value. */ |
| 1306 | |
| 1307 | /* Get symbol value. (Common symbols are special.) */ |
| 1308 | if (bfd_is_com_section (symbol->section)) |
| 1309 | relocation = 0; |
| 1310 | else |
| 1311 | relocation = symbol->value; |
| 1312 | |
| 1313 | reloc_target_output_section = bfd_get_output_section (symbol); |
| 1314 | |
| 1315 | /* Here the variable relocation holds the final address of the symbol we |
| 1316 | are relocating against, plus any addend. */ |
| 1317 | if (output_bfd) |
| 1318 | output_base = 0; |
| 1319 | else |
| 1320 | output_base = reloc_target_output_section->vma; |
| 1321 | |
| 1322 | relocation += output_base + symbol->section->output_offset; |
| 1323 | |
| 1324 | if (output_bfd != (bfd *) NULL) |
| 1325 | { |
| 1326 | /* Add in supplied addend. */ |
| 1327 | relocation += reloc_entry->addend; |
| 1328 | |
| 1329 | /* This is a partial relocation, and we want to apply the |
| 1330 | relocation to the reloc entry rather than the raw data. |
| 1331 | Modify the reloc inplace to reflect what we now know. */ |
| 1332 | reloc_entry->addend = relocation; |
| 1333 | reloc_entry->address += input_section->output_offset; |
| 1334 | return flag; |
| 1335 | } |
| 1336 | |
| 1337 | return mmix_final_link_relocate (reloc_entry->howto, input_section, |
| 1338 | data, reloc_entry->address, |
| 1339 | reloc_entry->addend, relocation, |
| 1340 | bfd_asymbol_name (symbol), |
| 1341 | reloc_target_output_section, |
| 1342 | error_message); |
| 1343 | } |
| 1344 | \f |
| 1345 | /* Relocate an MMIX ELF section. Modified from elf32-fr30.c; look to it |
| 1346 | for guidance if you're thinking of copying this. */ |
| 1347 | |
| 1348 | static bfd_boolean |
| 1349 | mmix_elf_relocate_section (bfd *output_bfd ATTRIBUTE_UNUSED, |
| 1350 | struct bfd_link_info *info, |
| 1351 | bfd *input_bfd, |
| 1352 | asection *input_section, |
| 1353 | bfd_byte *contents, |
| 1354 | Elf_Internal_Rela *relocs, |
| 1355 | Elf_Internal_Sym *local_syms, |
| 1356 | asection **local_sections) |
| 1357 | { |
| 1358 | Elf_Internal_Shdr *symtab_hdr; |
| 1359 | struct elf_link_hash_entry **sym_hashes; |
| 1360 | Elf_Internal_Rela *rel; |
| 1361 | Elf_Internal_Rela *relend; |
| 1362 | bfd_size_type size; |
| 1363 | size_t pjsno = 0; |
| 1364 | |
| 1365 | size = input_section->rawsize ? input_section->rawsize : input_section->size; |
| 1366 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 1367 | sym_hashes = elf_sym_hashes (input_bfd); |
| 1368 | relend = relocs + input_section->reloc_count; |
| 1369 | |
| 1370 | /* Zero the stub area before we start. */ |
| 1371 | if (input_section->rawsize != 0 |
| 1372 | && input_section->size > input_section->rawsize) |
| 1373 | memset (contents + input_section->rawsize, 0, |
| 1374 | input_section->size - input_section->rawsize); |
| 1375 | |
| 1376 | for (rel = relocs; rel < relend; rel ++) |
| 1377 | { |
| 1378 | reloc_howto_type *howto; |
| 1379 | unsigned long r_symndx; |
| 1380 | Elf_Internal_Sym *sym; |
| 1381 | asection *sec; |
| 1382 | struct elf_link_hash_entry *h; |
| 1383 | bfd_vma relocation; |
| 1384 | bfd_reloc_status_type r; |
| 1385 | const char *name = NULL; |
| 1386 | int r_type; |
| 1387 | bfd_boolean undefined_signalled = FALSE; |
| 1388 | |
| 1389 | r_type = ELF64_R_TYPE (rel->r_info); |
| 1390 | |
| 1391 | if (r_type == R_MMIX_GNU_VTINHERIT |
| 1392 | || r_type == R_MMIX_GNU_VTENTRY) |
| 1393 | continue; |
| 1394 | |
| 1395 | r_symndx = ELF64_R_SYM (rel->r_info); |
| 1396 | |
| 1397 | howto = elf_mmix_howto_table + ELF64_R_TYPE (rel->r_info); |
| 1398 | h = NULL; |
| 1399 | sym = NULL; |
| 1400 | sec = NULL; |
| 1401 | |
| 1402 | if (r_symndx < symtab_hdr->sh_info) |
| 1403 | { |
| 1404 | sym = local_syms + r_symndx; |
| 1405 | sec = local_sections [r_symndx]; |
| 1406 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); |
| 1407 | |
| 1408 | name = bfd_elf_string_from_elf_section (input_bfd, |
| 1409 | symtab_hdr->sh_link, |
| 1410 | sym->st_name); |
| 1411 | if (name == NULL) |
| 1412 | name = bfd_section_name (input_bfd, sec); |
| 1413 | } |
| 1414 | else |
| 1415 | { |
| 1416 | bfd_boolean unresolved_reloc; |
| 1417 | |
| 1418 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
| 1419 | r_symndx, symtab_hdr, sym_hashes, |
| 1420 | h, sec, relocation, |
| 1421 | unresolved_reloc, undefined_signalled); |
| 1422 | name = h->root.root.string; |
| 1423 | } |
| 1424 | |
| 1425 | if (sec != NULL && discarded_section (sec)) |
| 1426 | RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, |
| 1427 | rel, 1, relend, howto, 0, contents); |
| 1428 | |
| 1429 | if (info->relocatable) |
| 1430 | { |
| 1431 | /* This is a relocatable link. For most relocs we don't have to |
| 1432 | change anything, unless the reloc is against a section |
| 1433 | symbol, in which case we have to adjust according to where |
| 1434 | the section symbol winds up in the output section. */ |
| 1435 | if (sym != NULL && ELF_ST_TYPE (sym->st_info) == STT_SECTION) |
| 1436 | rel->r_addend += sec->output_offset; |
| 1437 | |
| 1438 | /* For PUSHJ stub relocs however, we may need to change the |
| 1439 | reloc and the section contents, if the reloc doesn't reach |
| 1440 | beyond the end of the output section and previous stubs. |
| 1441 | Then we change the section contents to be a PUSHJ to the end |
| 1442 | of the input section plus stubs (we can do that without using |
| 1443 | a reloc), and then we change the reloc to be a R_MMIX_PUSHJ |
| 1444 | at the stub location. */ |
| 1445 | if (r_type == R_MMIX_PUSHJ_STUBBABLE) |
| 1446 | { |
| 1447 | /* We've already checked whether we need a stub; use that |
| 1448 | knowledge. */ |
| 1449 | if (mmix_elf_section_data (input_section)->pjs.stub_size[pjsno] |
| 1450 | != 0) |
| 1451 | { |
| 1452 | Elf_Internal_Rela relcpy; |
| 1453 | |
| 1454 | if (mmix_elf_section_data (input_section) |
| 1455 | ->pjs.stub_size[pjsno] != MAX_PUSHJ_STUB_SIZE) |
| 1456 | abort (); |
| 1457 | |
| 1458 | /* There's already a PUSHJ insn there, so just fill in |
| 1459 | the offset bits to the stub. */ |
| 1460 | if (mmix_final_link_relocate (elf_mmix_howto_table |
| 1461 | + R_MMIX_ADDR19, |
| 1462 | input_section, |
| 1463 | contents, |
| 1464 | rel->r_offset, |
| 1465 | 0, |
| 1466 | input_section |
| 1467 | ->output_section->vma |
| 1468 | + input_section->output_offset |
| 1469 | + size |
| 1470 | + mmix_elf_section_data (input_section) |
| 1471 | ->pjs.stub_offset, |
| 1472 | NULL, NULL, NULL) != bfd_reloc_ok) |
| 1473 | return FALSE; |
| 1474 | |
| 1475 | /* Put a JMP insn at the stub; it goes with the |
| 1476 | R_MMIX_JMP reloc. */ |
| 1477 | bfd_put_32 (output_bfd, JMP_INSN_BYTE << 24, |
| 1478 | contents |
| 1479 | + size |
| 1480 | + mmix_elf_section_data (input_section) |
| 1481 | ->pjs.stub_offset); |
| 1482 | |
| 1483 | /* Change the reloc to be at the stub, and to a full |
| 1484 | R_MMIX_JMP reloc. */ |
| 1485 | rel->r_info = ELF64_R_INFO (r_symndx, R_MMIX_JMP); |
| 1486 | rel->r_offset |
| 1487 | = (size |
| 1488 | + mmix_elf_section_data (input_section) |
| 1489 | ->pjs.stub_offset); |
| 1490 | |
| 1491 | mmix_elf_section_data (input_section)->pjs.stub_offset |
| 1492 | += MAX_PUSHJ_STUB_SIZE; |
| 1493 | |
| 1494 | /* Shift this reloc to the end of the relocs to maintain |
| 1495 | the r_offset sorted reloc order. */ |
| 1496 | relcpy = *rel; |
| 1497 | memmove (rel, rel + 1, (char *) relend - (char *) rel); |
| 1498 | relend[-1] = relcpy; |
| 1499 | |
| 1500 | /* Back up one reloc, or else we'd skip the next reloc |
| 1501 | in turn. */ |
| 1502 | rel--; |
| 1503 | } |
| 1504 | |
| 1505 | pjsno++; |
| 1506 | } |
| 1507 | continue; |
| 1508 | } |
| 1509 | |
| 1510 | r = mmix_final_link_relocate (howto, input_section, |
| 1511 | contents, rel->r_offset, |
| 1512 | rel->r_addend, relocation, name, sec, NULL); |
| 1513 | |
| 1514 | if (r != bfd_reloc_ok) |
| 1515 | { |
| 1516 | bfd_boolean check_ok = TRUE; |
| 1517 | const char * msg = (const char *) NULL; |
| 1518 | |
| 1519 | switch (r) |
| 1520 | { |
| 1521 | case bfd_reloc_overflow: |
| 1522 | check_ok = info->callbacks->reloc_overflow |
| 1523 | (info, (h ? &h->root : NULL), name, howto->name, |
| 1524 | (bfd_vma) 0, input_bfd, input_section, rel->r_offset); |
| 1525 | break; |
| 1526 | |
| 1527 | case bfd_reloc_undefined: |
| 1528 | /* We may have sent this message above. */ |
| 1529 | if (! undefined_signalled) |
| 1530 | check_ok = info->callbacks->undefined_symbol |
| 1531 | (info, name, input_bfd, input_section, rel->r_offset, |
| 1532 | TRUE); |
| 1533 | undefined_signalled = TRUE; |
| 1534 | break; |
| 1535 | |
| 1536 | case bfd_reloc_outofrange: |
| 1537 | msg = _("internal error: out of range error"); |
| 1538 | break; |
| 1539 | |
| 1540 | case bfd_reloc_notsupported: |
| 1541 | msg = _("internal error: unsupported relocation error"); |
| 1542 | break; |
| 1543 | |
| 1544 | case bfd_reloc_dangerous: |
| 1545 | msg = _("internal error: dangerous relocation"); |
| 1546 | break; |
| 1547 | |
| 1548 | default: |
| 1549 | msg = _("internal error: unknown error"); |
| 1550 | break; |
| 1551 | } |
| 1552 | |
| 1553 | if (msg) |
| 1554 | check_ok = info->callbacks->warning |
| 1555 | (info, msg, name, input_bfd, input_section, rel->r_offset); |
| 1556 | |
| 1557 | if (! check_ok) |
| 1558 | return FALSE; |
| 1559 | } |
| 1560 | } |
| 1561 | |
| 1562 | return TRUE; |
| 1563 | } |
| 1564 | \f |
| 1565 | /* Perform a single relocation. By default we use the standard BFD |
| 1566 | routines. A few relocs we have to do ourselves. */ |
| 1567 | |
| 1568 | static bfd_reloc_status_type |
| 1569 | mmix_final_link_relocate (reloc_howto_type *howto, asection *input_section, |
| 1570 | bfd_byte *contents, bfd_vma r_offset, |
| 1571 | bfd_signed_vma r_addend, bfd_vma relocation, |
| 1572 | const char *symname, asection *symsec, |
| 1573 | char **error_message) |
| 1574 | { |
| 1575 | bfd_reloc_status_type r = bfd_reloc_ok; |
| 1576 | bfd_vma addr |
| 1577 | = (input_section->output_section->vma |
| 1578 | + input_section->output_offset |
| 1579 | + r_offset); |
| 1580 | bfd_signed_vma srel |
| 1581 | = (bfd_signed_vma) relocation + r_addend; |
| 1582 | |
| 1583 | switch (howto->type) |
| 1584 | { |
| 1585 | /* All these are PC-relative. */ |
| 1586 | case R_MMIX_PUSHJ_STUBBABLE: |
| 1587 | case R_MMIX_PUSHJ: |
| 1588 | case R_MMIX_CBRANCH: |
| 1589 | case R_MMIX_ADDR19: |
| 1590 | case R_MMIX_GETA: |
| 1591 | case R_MMIX_ADDR27: |
| 1592 | case R_MMIX_JMP: |
| 1593 | contents += r_offset; |
| 1594 | |
| 1595 | srel -= (input_section->output_section->vma |
| 1596 | + input_section->output_offset |
| 1597 | + r_offset); |
| 1598 | |
| 1599 | r = mmix_elf_perform_relocation (input_section, howto, contents, |
| 1600 | addr, srel, error_message); |
| 1601 | break; |
| 1602 | |
| 1603 | case R_MMIX_BASE_PLUS_OFFSET: |
| 1604 | if (symsec == NULL) |
| 1605 | return bfd_reloc_undefined; |
| 1606 | |
| 1607 | /* Check that we're not relocating against a register symbol. */ |
| 1608 | if (strcmp (bfd_get_section_name (symsec->owner, symsec), |
| 1609 | MMIX_REG_CONTENTS_SECTION_NAME) == 0 |
| 1610 | || strcmp (bfd_get_section_name (symsec->owner, symsec), |
| 1611 | MMIX_REG_SECTION_NAME) == 0) |
| 1612 | { |
| 1613 | /* Note: This is separated out into two messages in order |
| 1614 | to ease the translation into other languages. */ |
| 1615 | if (symname == NULL || *symname == 0) |
| 1616 | (*_bfd_error_handler) |
| 1617 | (_("%s: base-plus-offset relocation against register symbol: (unknown) in %s"), |
| 1618 | bfd_get_filename (input_section->owner), |
| 1619 | bfd_get_section_name (symsec->owner, symsec)); |
| 1620 | else |
| 1621 | (*_bfd_error_handler) |
| 1622 | (_("%s: base-plus-offset relocation against register symbol: %s in %s"), |
| 1623 | bfd_get_filename (input_section->owner), symname, |
| 1624 | bfd_get_section_name (symsec->owner, symsec)); |
| 1625 | return bfd_reloc_overflow; |
| 1626 | } |
| 1627 | goto do_mmix_reloc; |
| 1628 | |
| 1629 | case R_MMIX_REG_OR_BYTE: |
| 1630 | case R_MMIX_REG: |
| 1631 | /* For now, we handle these alike. They must refer to an register |
| 1632 | symbol, which is either relative to the register section and in |
| 1633 | the range 0..255, or is in the register contents section with vma |
| 1634 | regno * 8. */ |
| 1635 | |
| 1636 | /* FIXME: A better way to check for reg contents section? |
| 1637 | FIXME: Postpone section->scaling to mmix_elf_perform_relocation? */ |
| 1638 | if (symsec == NULL) |
| 1639 | return bfd_reloc_undefined; |
| 1640 | |
| 1641 | if (strcmp (bfd_get_section_name (symsec->owner, symsec), |
| 1642 | MMIX_REG_CONTENTS_SECTION_NAME) == 0) |
| 1643 | { |
| 1644 | if ((srel & 7) != 0 || srel < 32*8 || srel > 255*8) |
| 1645 | { |
| 1646 | /* The bfd_reloc_outofrange return value, though intuitively |
| 1647 | a better value, will not get us an error. */ |
| 1648 | return bfd_reloc_overflow; |
| 1649 | } |
| 1650 | srel /= 8; |
| 1651 | } |
| 1652 | else if (strcmp (bfd_get_section_name (symsec->owner, symsec), |
| 1653 | MMIX_REG_SECTION_NAME) == 0) |
| 1654 | { |
| 1655 | if (srel < 0 || srel > 255) |
| 1656 | /* The bfd_reloc_outofrange return value, though intuitively a |
| 1657 | better value, will not get us an error. */ |
| 1658 | return bfd_reloc_overflow; |
| 1659 | } |
| 1660 | else |
| 1661 | { |
| 1662 | /* Note: This is separated out into two messages in order |
| 1663 | to ease the translation into other languages. */ |
| 1664 | if (symname == NULL || *symname == 0) |
| 1665 | (*_bfd_error_handler) |
| 1666 | (_("%s: register relocation against non-register symbol: (unknown) in %s"), |
| 1667 | bfd_get_filename (input_section->owner), |
| 1668 | bfd_get_section_name (symsec->owner, symsec)); |
| 1669 | else |
| 1670 | (*_bfd_error_handler) |
| 1671 | (_("%s: register relocation against non-register symbol: %s in %s"), |
| 1672 | bfd_get_filename (input_section->owner), symname, |
| 1673 | bfd_get_section_name (symsec->owner, symsec)); |
| 1674 | |
| 1675 | /* The bfd_reloc_outofrange return value, though intuitively a |
| 1676 | better value, will not get us an error. */ |
| 1677 | return bfd_reloc_overflow; |
| 1678 | } |
| 1679 | do_mmix_reloc: |
| 1680 | contents += r_offset; |
| 1681 | r = mmix_elf_perform_relocation (input_section, howto, contents, |
| 1682 | addr, srel, error_message); |
| 1683 | break; |
| 1684 | |
| 1685 | case R_MMIX_LOCAL: |
| 1686 | /* This isn't a real relocation, it's just an assertion that the |
| 1687 | final relocation value corresponds to a local register. We |
| 1688 | ignore the actual relocation; nothing is changed. */ |
| 1689 | { |
| 1690 | asection *regsec |
| 1691 | = bfd_get_section_by_name (input_section->output_section->owner, |
| 1692 | MMIX_REG_CONTENTS_SECTION_NAME); |
| 1693 | bfd_vma first_global; |
| 1694 | |
| 1695 | /* Check that this is an absolute value, or a reference to the |
| 1696 | register contents section or the register (symbol) section. |
| 1697 | Absolute numbers can get here as undefined section. Undefined |
| 1698 | symbols are signalled elsewhere, so there's no conflict in us |
| 1699 | accidentally handling it. */ |
| 1700 | if (!bfd_is_abs_section (symsec) |
| 1701 | && !bfd_is_und_section (symsec) |
| 1702 | && strcmp (bfd_get_section_name (symsec->owner, symsec), |
| 1703 | MMIX_REG_CONTENTS_SECTION_NAME) != 0 |
| 1704 | && strcmp (bfd_get_section_name (symsec->owner, symsec), |
| 1705 | MMIX_REG_SECTION_NAME) != 0) |
| 1706 | { |
| 1707 | (*_bfd_error_handler) |
| 1708 | (_("%s: directive LOCAL valid only with a register or absolute value"), |
| 1709 | bfd_get_filename (input_section->owner)); |
| 1710 | |
| 1711 | return bfd_reloc_overflow; |
| 1712 | } |
| 1713 | |
| 1714 | /* If we don't have a register contents section, then $255 is the |
| 1715 | first global register. */ |
| 1716 | if (regsec == NULL) |
| 1717 | first_global = 255; |
| 1718 | else |
| 1719 | { |
| 1720 | first_global |
| 1721 | = bfd_get_section_vma (input_section->output_section->owner, |
| 1722 | regsec) / 8; |
| 1723 | if (strcmp (bfd_get_section_name (symsec->owner, symsec), |
| 1724 | MMIX_REG_CONTENTS_SECTION_NAME) == 0) |
| 1725 | { |
| 1726 | if ((srel & 7) != 0 || srel < 32*8 || srel > 255*8) |
| 1727 | /* The bfd_reloc_outofrange return value, though |
| 1728 | intuitively a better value, will not get us an error. */ |
| 1729 | return bfd_reloc_overflow; |
| 1730 | srel /= 8; |
| 1731 | } |
| 1732 | } |
| 1733 | |
| 1734 | if ((bfd_vma) srel >= first_global) |
| 1735 | { |
| 1736 | /* FIXME: Better error message. */ |
| 1737 | (*_bfd_error_handler) |
| 1738 | (_("%s: LOCAL directive: Register $%ld is not a local register. First global register is $%ld."), |
| 1739 | bfd_get_filename (input_section->owner), (long) srel, (long) first_global); |
| 1740 | |
| 1741 | return bfd_reloc_overflow; |
| 1742 | } |
| 1743 | } |
| 1744 | r = bfd_reloc_ok; |
| 1745 | break; |
| 1746 | |
| 1747 | default: |
| 1748 | r = _bfd_final_link_relocate (howto, input_section->owner, input_section, |
| 1749 | contents, r_offset, |
| 1750 | relocation, r_addend); |
| 1751 | } |
| 1752 | |
| 1753 | return r; |
| 1754 | } |
| 1755 | \f |
| 1756 | /* Return the section that should be marked against GC for a given |
| 1757 | relocation. */ |
| 1758 | |
| 1759 | static asection * |
| 1760 | mmix_elf_gc_mark_hook (asection *sec, |
| 1761 | struct bfd_link_info *info, |
| 1762 | Elf_Internal_Rela *rel, |
| 1763 | struct elf_link_hash_entry *h, |
| 1764 | Elf_Internal_Sym *sym) |
| 1765 | { |
| 1766 | if (h != NULL) |
| 1767 | switch (ELF64_R_TYPE (rel->r_info)) |
| 1768 | { |
| 1769 | case R_MMIX_GNU_VTINHERIT: |
| 1770 | case R_MMIX_GNU_VTENTRY: |
| 1771 | return NULL; |
| 1772 | } |
| 1773 | |
| 1774 | return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); |
| 1775 | } |
| 1776 | |
| 1777 | /* Update relocation info for a GC-excluded section. We could supposedly |
| 1778 | perform the allocation after GC, but there's no suitable hook between |
| 1779 | GC (or section merge) and the point when all input sections must be |
| 1780 | present. Better to waste some memory and (perhaps) a little time. */ |
| 1781 | |
| 1782 | static bfd_boolean |
| 1783 | mmix_elf_gc_sweep_hook (bfd *abfd ATTRIBUTE_UNUSED, |
| 1784 | struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 1785 | asection *sec, |
| 1786 | const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED) |
| 1787 | { |
| 1788 | struct bpo_reloc_section_info *bpodata |
| 1789 | = mmix_elf_section_data (sec)->bpo.reloc; |
| 1790 | asection *allocated_gregs_section; |
| 1791 | |
| 1792 | /* If no bpodata here, we have nothing to do. */ |
| 1793 | if (bpodata == NULL) |
| 1794 | return TRUE; |
| 1795 | |
| 1796 | allocated_gregs_section = bpodata->bpo_greg_section; |
| 1797 | |
| 1798 | mmix_elf_section_data (allocated_gregs_section)->bpo.greg->n_bpo_relocs |
| 1799 | -= bpodata->n_bpo_relocs_this_section; |
| 1800 | |
| 1801 | return TRUE; |
| 1802 | } |
| 1803 | \f |
| 1804 | /* Sort register relocs to come before expanding relocs. */ |
| 1805 | |
| 1806 | static int |
| 1807 | mmix_elf_sort_relocs (const void * p1, const void * p2) |
| 1808 | { |
| 1809 | const Elf_Internal_Rela *r1 = (const Elf_Internal_Rela *) p1; |
| 1810 | const Elf_Internal_Rela *r2 = (const Elf_Internal_Rela *) p2; |
| 1811 | int r1_is_reg, r2_is_reg; |
| 1812 | |
| 1813 | /* Sort primarily on r_offset & ~3, so relocs are done to consecutive |
| 1814 | insns. */ |
| 1815 | if ((r1->r_offset & ~(bfd_vma) 3) > (r2->r_offset & ~(bfd_vma) 3)) |
| 1816 | return 1; |
| 1817 | else if ((r1->r_offset & ~(bfd_vma) 3) < (r2->r_offset & ~(bfd_vma) 3)) |
| 1818 | return -1; |
| 1819 | |
| 1820 | r1_is_reg |
| 1821 | = (ELF64_R_TYPE (r1->r_info) == R_MMIX_REG_OR_BYTE |
| 1822 | || ELF64_R_TYPE (r1->r_info) == R_MMIX_REG); |
| 1823 | r2_is_reg |
| 1824 | = (ELF64_R_TYPE (r2->r_info) == R_MMIX_REG_OR_BYTE |
| 1825 | || ELF64_R_TYPE (r2->r_info) == R_MMIX_REG); |
| 1826 | if (r1_is_reg != r2_is_reg) |
| 1827 | return r2_is_reg - r1_is_reg; |
| 1828 | |
| 1829 | /* Neither or both are register relocs. Then sort on full offset. */ |
| 1830 | if (r1->r_offset > r2->r_offset) |
| 1831 | return 1; |
| 1832 | else if (r1->r_offset < r2->r_offset) |
| 1833 | return -1; |
| 1834 | return 0; |
| 1835 | } |
| 1836 | |
| 1837 | /* Subset of mmix_elf_check_relocs, common to ELF and mmo linking. */ |
| 1838 | |
| 1839 | static bfd_boolean |
| 1840 | mmix_elf_check_common_relocs (bfd *abfd, |
| 1841 | struct bfd_link_info *info, |
| 1842 | asection *sec, |
| 1843 | const Elf_Internal_Rela *relocs) |
| 1844 | { |
| 1845 | bfd *bpo_greg_owner = NULL; |
| 1846 | asection *allocated_gregs_section = NULL; |
| 1847 | struct bpo_greg_section_info *gregdata = NULL; |
| 1848 | struct bpo_reloc_section_info *bpodata = NULL; |
| 1849 | const Elf_Internal_Rela *rel; |
| 1850 | const Elf_Internal_Rela *rel_end; |
| 1851 | |
| 1852 | /* We currently have to abuse this COFF-specific member, since there's |
| 1853 | no target-machine-dedicated member. There's no alternative outside |
| 1854 | the bfd_link_info struct; we can't specialize a hash-table since |
| 1855 | they're different between ELF and mmo. */ |
| 1856 | bpo_greg_owner = (bfd *) info->base_file; |
| 1857 | |
| 1858 | rel_end = relocs + sec->reloc_count; |
| 1859 | for (rel = relocs; rel < rel_end; rel++) |
| 1860 | { |
| 1861 | switch (ELF64_R_TYPE (rel->r_info)) |
| 1862 | { |
| 1863 | /* This relocation causes a GREG allocation. We need to count |
| 1864 | them, and we need to create a section for them, so we need an |
| 1865 | object to fake as the owner of that section. We can't use |
| 1866 | the ELF dynobj for this, since the ELF bits assume lots of |
| 1867 | DSO-related stuff if that member is non-NULL. */ |
| 1868 | case R_MMIX_BASE_PLUS_OFFSET: |
| 1869 | /* We don't do anything with this reloc for a relocatable link. */ |
| 1870 | if (info->relocatable) |
| 1871 | break; |
| 1872 | |
| 1873 | if (bpo_greg_owner == NULL) |
| 1874 | { |
| 1875 | bpo_greg_owner = abfd; |
| 1876 | info->base_file = bpo_greg_owner; |
| 1877 | } |
| 1878 | |
| 1879 | if (allocated_gregs_section == NULL) |
| 1880 | allocated_gregs_section |
| 1881 | = bfd_get_section_by_name (bpo_greg_owner, |
| 1882 | MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); |
| 1883 | |
| 1884 | if (allocated_gregs_section == NULL) |
| 1885 | { |
| 1886 | allocated_gregs_section |
| 1887 | = bfd_make_section_with_flags (bpo_greg_owner, |
| 1888 | MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME, |
| 1889 | (SEC_HAS_CONTENTS |
| 1890 | | SEC_IN_MEMORY |
| 1891 | | SEC_LINKER_CREATED)); |
| 1892 | /* Setting both SEC_ALLOC and SEC_LOAD means the section is |
| 1893 | treated like any other section, and we'd get errors for |
| 1894 | address overlap with the text section. Let's set none of |
| 1895 | those flags, as that is what currently happens for usual |
| 1896 | GREG allocations, and that works. */ |
| 1897 | if (allocated_gregs_section == NULL |
| 1898 | || !bfd_set_section_alignment (bpo_greg_owner, |
| 1899 | allocated_gregs_section, |
| 1900 | 3)) |
| 1901 | return FALSE; |
| 1902 | |
| 1903 | gregdata = (struct bpo_greg_section_info *) |
| 1904 | bfd_zalloc (bpo_greg_owner, sizeof (struct bpo_greg_section_info)); |
| 1905 | if (gregdata == NULL) |
| 1906 | return FALSE; |
| 1907 | mmix_elf_section_data (allocated_gregs_section)->bpo.greg |
| 1908 | = gregdata; |
| 1909 | } |
| 1910 | else if (gregdata == NULL) |
| 1911 | gregdata |
| 1912 | = mmix_elf_section_data (allocated_gregs_section)->bpo.greg; |
| 1913 | |
| 1914 | /* Get ourselves some auxiliary info for the BPO-relocs. */ |
| 1915 | if (bpodata == NULL) |
| 1916 | { |
| 1917 | /* No use doing a separate iteration pass to find the upper |
| 1918 | limit - just use the number of relocs. */ |
| 1919 | bpodata = (struct bpo_reloc_section_info *) |
| 1920 | bfd_alloc (bpo_greg_owner, |
| 1921 | sizeof (struct bpo_reloc_section_info) |
| 1922 | * (sec->reloc_count + 1)); |
| 1923 | if (bpodata == NULL) |
| 1924 | return FALSE; |
| 1925 | mmix_elf_section_data (sec)->bpo.reloc = bpodata; |
| 1926 | bpodata->first_base_plus_offset_reloc |
| 1927 | = bpodata->bpo_index |
| 1928 | = gregdata->n_max_bpo_relocs; |
| 1929 | bpodata->bpo_greg_section |
| 1930 | = allocated_gregs_section; |
| 1931 | bpodata->n_bpo_relocs_this_section = 0; |
| 1932 | } |
| 1933 | |
| 1934 | bpodata->n_bpo_relocs_this_section++; |
| 1935 | gregdata->n_max_bpo_relocs++; |
| 1936 | |
| 1937 | /* We don't get another chance to set this before GC; we've not |
| 1938 | set up any hook that runs before GC. */ |
| 1939 | gregdata->n_bpo_relocs |
| 1940 | = gregdata->n_max_bpo_relocs; |
| 1941 | break; |
| 1942 | |
| 1943 | case R_MMIX_PUSHJ_STUBBABLE: |
| 1944 | mmix_elf_section_data (sec)->pjs.n_pushj_relocs++; |
| 1945 | break; |
| 1946 | } |
| 1947 | } |
| 1948 | |
| 1949 | /* Allocate per-reloc stub storage and initialize it to the max stub |
| 1950 | size. */ |
| 1951 | if (mmix_elf_section_data (sec)->pjs.n_pushj_relocs != 0) |
| 1952 | { |
| 1953 | size_t i; |
| 1954 | |
| 1955 | mmix_elf_section_data (sec)->pjs.stub_size |
| 1956 | = bfd_alloc (abfd, mmix_elf_section_data (sec)->pjs.n_pushj_relocs |
| 1957 | * sizeof (mmix_elf_section_data (sec) |
| 1958 | ->pjs.stub_size[0])); |
| 1959 | if (mmix_elf_section_data (sec)->pjs.stub_size == NULL) |
| 1960 | return FALSE; |
| 1961 | |
| 1962 | for (i = 0; i < mmix_elf_section_data (sec)->pjs.n_pushj_relocs; i++) |
| 1963 | mmix_elf_section_data (sec)->pjs.stub_size[i] = MAX_PUSHJ_STUB_SIZE; |
| 1964 | } |
| 1965 | |
| 1966 | return TRUE; |
| 1967 | } |
| 1968 | |
| 1969 | /* Look through the relocs for a section during the first phase. */ |
| 1970 | |
| 1971 | static bfd_boolean |
| 1972 | mmix_elf_check_relocs (bfd *abfd, |
| 1973 | struct bfd_link_info *info, |
| 1974 | asection *sec, |
| 1975 | const Elf_Internal_Rela *relocs) |
| 1976 | { |
| 1977 | Elf_Internal_Shdr *symtab_hdr; |
| 1978 | struct elf_link_hash_entry **sym_hashes; |
| 1979 | const Elf_Internal_Rela *rel; |
| 1980 | const Elf_Internal_Rela *rel_end; |
| 1981 | |
| 1982 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 1983 | sym_hashes = elf_sym_hashes (abfd); |
| 1984 | |
| 1985 | /* First we sort the relocs so that any register relocs come before |
| 1986 | expansion-relocs to the same insn. FIXME: Not done for mmo. */ |
| 1987 | qsort ((void *) relocs, sec->reloc_count, sizeof (Elf_Internal_Rela), |
| 1988 | mmix_elf_sort_relocs); |
| 1989 | |
| 1990 | /* Do the common part. */ |
| 1991 | if (!mmix_elf_check_common_relocs (abfd, info, sec, relocs)) |
| 1992 | return FALSE; |
| 1993 | |
| 1994 | if (info->relocatable) |
| 1995 | return TRUE; |
| 1996 | |
| 1997 | rel_end = relocs + sec->reloc_count; |
| 1998 | for (rel = relocs; rel < rel_end; rel++) |
| 1999 | { |
| 2000 | struct elf_link_hash_entry *h; |
| 2001 | unsigned long r_symndx; |
| 2002 | |
| 2003 | r_symndx = ELF64_R_SYM (rel->r_info); |
| 2004 | if (r_symndx < symtab_hdr->sh_info) |
| 2005 | h = NULL; |
| 2006 | else |
| 2007 | { |
| 2008 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 2009 | while (h->root.type == bfd_link_hash_indirect |
| 2010 | || h->root.type == bfd_link_hash_warning) |
| 2011 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 2012 | } |
| 2013 | |
| 2014 | switch (ELF64_R_TYPE (rel->r_info)) |
| 2015 | { |
| 2016 | /* This relocation describes the C++ object vtable hierarchy. |
| 2017 | Reconstruct it for later use during GC. */ |
| 2018 | case R_MMIX_GNU_VTINHERIT: |
| 2019 | if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) |
| 2020 | return FALSE; |
| 2021 | break; |
| 2022 | |
| 2023 | /* This relocation describes which C++ vtable entries are actually |
| 2024 | used. Record for later use during GC. */ |
| 2025 | case R_MMIX_GNU_VTENTRY: |
| 2026 | BFD_ASSERT (h != NULL); |
| 2027 | if (h != NULL |
| 2028 | && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) |
| 2029 | return FALSE; |
| 2030 | break; |
| 2031 | } |
| 2032 | } |
| 2033 | |
| 2034 | return TRUE; |
| 2035 | } |
| 2036 | |
| 2037 | /* Wrapper for mmix_elf_check_common_relocs, called when linking to mmo. |
| 2038 | Copied from elf_link_add_object_symbols. */ |
| 2039 | |
| 2040 | bfd_boolean |
| 2041 | _bfd_mmix_check_all_relocs (bfd *abfd, struct bfd_link_info *info) |
| 2042 | { |
| 2043 | asection *o; |
| 2044 | |
| 2045 | for (o = abfd->sections; o != NULL; o = o->next) |
| 2046 | { |
| 2047 | Elf_Internal_Rela *internal_relocs; |
| 2048 | bfd_boolean ok; |
| 2049 | |
| 2050 | if ((o->flags & SEC_RELOC) == 0 |
| 2051 | || o->reloc_count == 0 |
| 2052 | || ((info->strip == strip_all || info->strip == strip_debugger) |
| 2053 | && (o->flags & SEC_DEBUGGING) != 0) |
| 2054 | || bfd_is_abs_section (o->output_section)) |
| 2055 | continue; |
| 2056 | |
| 2057 | internal_relocs |
| 2058 | = _bfd_elf_link_read_relocs (abfd, o, NULL, |
| 2059 | (Elf_Internal_Rela *) NULL, |
| 2060 | info->keep_memory); |
| 2061 | if (internal_relocs == NULL) |
| 2062 | return FALSE; |
| 2063 | |
| 2064 | ok = mmix_elf_check_common_relocs (abfd, info, o, internal_relocs); |
| 2065 | |
| 2066 | if (! info->keep_memory) |
| 2067 | free (internal_relocs); |
| 2068 | |
| 2069 | if (! ok) |
| 2070 | return FALSE; |
| 2071 | } |
| 2072 | |
| 2073 | return TRUE; |
| 2074 | } |
| 2075 | \f |
| 2076 | /* Change symbols relative to the reg contents section to instead be to |
| 2077 | the register section, and scale them down to correspond to the register |
| 2078 | number. */ |
| 2079 | |
| 2080 | static int |
| 2081 | mmix_elf_link_output_symbol_hook (struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 2082 | const char *name ATTRIBUTE_UNUSED, |
| 2083 | Elf_Internal_Sym *sym, |
| 2084 | asection *input_sec, |
| 2085 | struct elf_link_hash_entry *h ATTRIBUTE_UNUSED) |
| 2086 | { |
| 2087 | if (input_sec != NULL |
| 2088 | && input_sec->name != NULL |
| 2089 | && ELF_ST_TYPE (sym->st_info) != STT_SECTION |
| 2090 | && strcmp (input_sec->name, MMIX_REG_CONTENTS_SECTION_NAME) == 0) |
| 2091 | { |
| 2092 | sym->st_value /= 8; |
| 2093 | sym->st_shndx = SHN_REGISTER; |
| 2094 | } |
| 2095 | |
| 2096 | return 1; |
| 2097 | } |
| 2098 | |
| 2099 | /* We fake a register section that holds values that are register numbers. |
| 2100 | Having a SHN_REGISTER and register section translates better to other |
| 2101 | formats (e.g. mmo) than for example a STT_REGISTER attribute. |
| 2102 | This section faking is based on a construct in elf32-mips.c. */ |
| 2103 | static asection mmix_elf_reg_section; |
| 2104 | static asymbol mmix_elf_reg_section_symbol; |
| 2105 | static asymbol *mmix_elf_reg_section_symbol_ptr; |
| 2106 | |
| 2107 | /* Handle the special section numbers that a symbol may use. */ |
| 2108 | |
| 2109 | void |
| 2110 | mmix_elf_symbol_processing (abfd, asym) |
| 2111 | bfd *abfd ATTRIBUTE_UNUSED; |
| 2112 | asymbol *asym; |
| 2113 | { |
| 2114 | elf_symbol_type *elfsym; |
| 2115 | |
| 2116 | elfsym = (elf_symbol_type *) asym; |
| 2117 | switch (elfsym->internal_elf_sym.st_shndx) |
| 2118 | { |
| 2119 | case SHN_REGISTER: |
| 2120 | if (mmix_elf_reg_section.name == NULL) |
| 2121 | { |
| 2122 | /* Initialize the register section. */ |
| 2123 | mmix_elf_reg_section.name = MMIX_REG_SECTION_NAME; |
| 2124 | mmix_elf_reg_section.flags = SEC_NO_FLAGS; |
| 2125 | mmix_elf_reg_section.output_section = &mmix_elf_reg_section; |
| 2126 | mmix_elf_reg_section.symbol = &mmix_elf_reg_section_symbol; |
| 2127 | mmix_elf_reg_section.symbol_ptr_ptr = &mmix_elf_reg_section_symbol_ptr; |
| 2128 | mmix_elf_reg_section_symbol.name = MMIX_REG_SECTION_NAME; |
| 2129 | mmix_elf_reg_section_symbol.flags = BSF_SECTION_SYM; |
| 2130 | mmix_elf_reg_section_symbol.section = &mmix_elf_reg_section; |
| 2131 | mmix_elf_reg_section_symbol_ptr = &mmix_elf_reg_section_symbol; |
| 2132 | } |
| 2133 | asym->section = &mmix_elf_reg_section; |
| 2134 | break; |
| 2135 | |
| 2136 | default: |
| 2137 | break; |
| 2138 | } |
| 2139 | } |
| 2140 | |
| 2141 | /* Given a BFD section, try to locate the corresponding ELF section |
| 2142 | index. */ |
| 2143 | |
| 2144 | static bfd_boolean |
| 2145 | mmix_elf_section_from_bfd_section (bfd * abfd ATTRIBUTE_UNUSED, |
| 2146 | asection * sec, |
| 2147 | int * retval) |
| 2148 | { |
| 2149 | if (strcmp (bfd_get_section_name (abfd, sec), MMIX_REG_SECTION_NAME) == 0) |
| 2150 | *retval = SHN_REGISTER; |
| 2151 | else |
| 2152 | return FALSE; |
| 2153 | |
| 2154 | return TRUE; |
| 2155 | } |
| 2156 | |
| 2157 | /* Hook called by the linker routine which adds symbols from an object |
| 2158 | file. We must handle the special SHN_REGISTER section number here. |
| 2159 | |
| 2160 | We also check that we only have *one* each of the section-start |
| 2161 | symbols, since otherwise having two with the same value would cause |
| 2162 | them to be "merged", but with the contents serialized. */ |
| 2163 | |
| 2164 | static bfd_boolean |
| 2165 | mmix_elf_add_symbol_hook (bfd *abfd, |
| 2166 | struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 2167 | Elf_Internal_Sym *sym, |
| 2168 | const char **namep ATTRIBUTE_UNUSED, |
| 2169 | flagword *flagsp ATTRIBUTE_UNUSED, |
| 2170 | asection **secp, |
| 2171 | bfd_vma *valp ATTRIBUTE_UNUSED) |
| 2172 | { |
| 2173 | if (sym->st_shndx == SHN_REGISTER) |
| 2174 | { |
| 2175 | *secp = bfd_make_section_old_way (abfd, MMIX_REG_SECTION_NAME); |
| 2176 | (*secp)->flags |= SEC_LINKER_CREATED; |
| 2177 | } |
| 2178 | else if ((*namep)[0] == '_' && (*namep)[1] == '_' && (*namep)[2] == '.' |
| 2179 | && CONST_STRNEQ (*namep, MMIX_LOC_SECTION_START_SYMBOL_PREFIX)) |
| 2180 | { |
| 2181 | /* See if we have another one. */ |
| 2182 | struct bfd_link_hash_entry *h = bfd_link_hash_lookup (info->hash, |
| 2183 | *namep, |
| 2184 | FALSE, |
| 2185 | FALSE, |
| 2186 | FALSE); |
| 2187 | |
| 2188 | if (h != NULL && h->type != bfd_link_hash_undefined) |
| 2189 | { |
| 2190 | /* How do we get the asymbol (or really: the filename) from h? |
| 2191 | h->u.def.section->owner is NULL. */ |
| 2192 | ((*_bfd_error_handler) |
| 2193 | (_("%s: Error: multiple definition of `%s'; start of %s is set in a earlier linked file\n"), |
| 2194 | bfd_get_filename (abfd), *namep, |
| 2195 | *namep + strlen (MMIX_LOC_SECTION_START_SYMBOL_PREFIX))); |
| 2196 | bfd_set_error (bfd_error_bad_value); |
| 2197 | return FALSE; |
| 2198 | } |
| 2199 | } |
| 2200 | |
| 2201 | return TRUE; |
| 2202 | } |
| 2203 | |
| 2204 | /* We consider symbols matching "L.*:[0-9]+" to be local symbols. */ |
| 2205 | |
| 2206 | static bfd_boolean |
| 2207 | mmix_elf_is_local_label_name (bfd *abfd, const char *name) |
| 2208 | { |
| 2209 | const char *colpos; |
| 2210 | int digits; |
| 2211 | |
| 2212 | /* Also include the default local-label definition. */ |
| 2213 | if (_bfd_elf_is_local_label_name (abfd, name)) |
| 2214 | return TRUE; |
| 2215 | |
| 2216 | if (*name != 'L') |
| 2217 | return FALSE; |
| 2218 | |
| 2219 | /* If there's no ":", or more than one, it's not a local symbol. */ |
| 2220 | colpos = strchr (name, ':'); |
| 2221 | if (colpos == NULL || strchr (colpos + 1, ':') != NULL) |
| 2222 | return FALSE; |
| 2223 | |
| 2224 | /* Check that there are remaining characters and that they are digits. */ |
| 2225 | if (colpos[1] == 0) |
| 2226 | return FALSE; |
| 2227 | |
| 2228 | digits = strspn (colpos + 1, "0123456789"); |
| 2229 | return digits != 0 && colpos[1 + digits] == 0; |
| 2230 | } |
| 2231 | |
| 2232 | /* We get rid of the register section here. */ |
| 2233 | |
| 2234 | bfd_boolean |
| 2235 | mmix_elf_final_link (bfd *abfd, struct bfd_link_info *info) |
| 2236 | { |
| 2237 | /* We never output a register section, though we create one for |
| 2238 | temporary measures. Check that nobody entered contents into it. */ |
| 2239 | asection *reg_section; |
| 2240 | |
| 2241 | reg_section = bfd_get_section_by_name (abfd, MMIX_REG_SECTION_NAME); |
| 2242 | |
| 2243 | if (reg_section != NULL) |
| 2244 | { |
| 2245 | /* FIXME: Pass error state gracefully. */ |
| 2246 | if (bfd_get_section_flags (abfd, reg_section) & SEC_HAS_CONTENTS) |
| 2247 | _bfd_abort (__FILE__, __LINE__, _("Register section has contents\n")); |
| 2248 | |
| 2249 | /* Really remove the section, if it hasn't already been done. */ |
| 2250 | if (!bfd_section_removed_from_list (abfd, reg_section)) |
| 2251 | { |
| 2252 | bfd_section_list_remove (abfd, reg_section); |
| 2253 | --abfd->section_count; |
| 2254 | } |
| 2255 | } |
| 2256 | |
| 2257 | if (! bfd_elf_final_link (abfd, info)) |
| 2258 | return FALSE; |
| 2259 | |
| 2260 | /* Since this section is marked SEC_LINKER_CREATED, it isn't output by |
| 2261 | the regular linker machinery. We do it here, like other targets with |
| 2262 | special sections. */ |
| 2263 | if (info->base_file != NULL) |
| 2264 | { |
| 2265 | asection *greg_section |
| 2266 | = bfd_get_section_by_name ((bfd *) info->base_file, |
| 2267 | MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); |
| 2268 | if (!bfd_set_section_contents (abfd, |
| 2269 | greg_section->output_section, |
| 2270 | greg_section->contents, |
| 2271 | (file_ptr) greg_section->output_offset, |
| 2272 | greg_section->size)) |
| 2273 | return FALSE; |
| 2274 | } |
| 2275 | return TRUE; |
| 2276 | } |
| 2277 | |
| 2278 | /* We need to include the maximum size of PUSHJ-stubs in the initial |
| 2279 | section size. This is expected to shrink during linker relaxation. */ |
| 2280 | |
| 2281 | static void |
| 2282 | mmix_set_relaxable_size (bfd *abfd ATTRIBUTE_UNUSED, |
| 2283 | asection *sec, |
| 2284 | void *ptr) |
| 2285 | { |
| 2286 | struct bfd_link_info *info = ptr; |
| 2287 | |
| 2288 | /* Make sure we only do this for section where we know we want this, |
| 2289 | otherwise we might end up resetting the size of COMMONs. */ |
| 2290 | if (mmix_elf_section_data (sec)->pjs.n_pushj_relocs == 0) |
| 2291 | return; |
| 2292 | |
| 2293 | sec->rawsize = sec->size; |
| 2294 | sec->size += (mmix_elf_section_data (sec)->pjs.n_pushj_relocs |
| 2295 | * MAX_PUSHJ_STUB_SIZE); |
| 2296 | |
| 2297 | /* For use in relocatable link, we start with a max stubs size. See |
| 2298 | mmix_elf_relax_section. */ |
| 2299 | if (info->relocatable && sec->output_section) |
| 2300 | mmix_elf_section_data (sec->output_section)->pjs.stubs_size_sum |
| 2301 | += (mmix_elf_section_data (sec)->pjs.n_pushj_relocs |
| 2302 | * MAX_PUSHJ_STUB_SIZE); |
| 2303 | } |
| 2304 | |
| 2305 | /* Initialize stuff for the linker-generated GREGs to match |
| 2306 | R_MMIX_BASE_PLUS_OFFSET relocs seen by the linker. */ |
| 2307 | |
| 2308 | bfd_boolean |
| 2309 | _bfd_mmix_before_linker_allocation (bfd *abfd ATTRIBUTE_UNUSED, |
| 2310 | struct bfd_link_info *info) |
| 2311 | { |
| 2312 | asection *bpo_gregs_section; |
| 2313 | bfd *bpo_greg_owner; |
| 2314 | struct bpo_greg_section_info *gregdata; |
| 2315 | size_t n_gregs; |
| 2316 | bfd_vma gregs_size; |
| 2317 | size_t i; |
| 2318 | size_t *bpo_reloc_indexes; |
| 2319 | bfd *ibfd; |
| 2320 | |
| 2321 | /* Set the initial size of sections. */ |
| 2322 | for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) |
| 2323 | bfd_map_over_sections (ibfd, mmix_set_relaxable_size, info); |
| 2324 | |
| 2325 | /* The bpo_greg_owner bfd is supposed to have been set by |
| 2326 | mmix_elf_check_relocs when the first R_MMIX_BASE_PLUS_OFFSET is seen. |
| 2327 | If there is no such object, there was no R_MMIX_BASE_PLUS_OFFSET. */ |
| 2328 | bpo_greg_owner = (bfd *) info->base_file; |
| 2329 | if (bpo_greg_owner == NULL) |
| 2330 | return TRUE; |
| 2331 | |
| 2332 | bpo_gregs_section |
| 2333 | = bfd_get_section_by_name (bpo_greg_owner, |
| 2334 | MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); |
| 2335 | |
| 2336 | if (bpo_gregs_section == NULL) |
| 2337 | return TRUE; |
| 2338 | |
| 2339 | /* We use the target-data handle in the ELF section data. */ |
| 2340 | gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; |
| 2341 | if (gregdata == NULL) |
| 2342 | return FALSE; |
| 2343 | |
| 2344 | n_gregs = gregdata->n_bpo_relocs; |
| 2345 | gregdata->n_allocated_bpo_gregs = n_gregs; |
| 2346 | |
| 2347 | /* When this reaches zero during relaxation, all entries have been |
| 2348 | filled in and the size of the linker gregs can be calculated. */ |
| 2349 | gregdata->n_remaining_bpo_relocs_this_relaxation_round = n_gregs; |
| 2350 | |
| 2351 | /* Set the zeroth-order estimate for the GREGs size. */ |
| 2352 | gregs_size = n_gregs * 8; |
| 2353 | |
| 2354 | if (!bfd_set_section_size (bpo_greg_owner, bpo_gregs_section, gregs_size)) |
| 2355 | return FALSE; |
| 2356 | |
| 2357 | /* Allocate and set up the GREG arrays. They're filled in at relaxation |
| 2358 | time. Note that we must use the max number ever noted for the array, |
| 2359 | since the index numbers were created before GC. */ |
| 2360 | gregdata->reloc_request |
| 2361 | = bfd_zalloc (bpo_greg_owner, |
| 2362 | sizeof (struct bpo_reloc_request) |
| 2363 | * gregdata->n_max_bpo_relocs); |
| 2364 | |
| 2365 | gregdata->bpo_reloc_indexes |
| 2366 | = bpo_reloc_indexes |
| 2367 | = bfd_alloc (bpo_greg_owner, |
| 2368 | gregdata->n_max_bpo_relocs |
| 2369 | * sizeof (size_t)); |
| 2370 | if (bpo_reloc_indexes == NULL) |
| 2371 | return FALSE; |
| 2372 | |
| 2373 | /* The default order is an identity mapping. */ |
| 2374 | for (i = 0; i < gregdata->n_max_bpo_relocs; i++) |
| 2375 | { |
| 2376 | bpo_reloc_indexes[i] = i; |
| 2377 | gregdata->reloc_request[i].bpo_reloc_no = i; |
| 2378 | } |
| 2379 | |
| 2380 | return TRUE; |
| 2381 | } |
| 2382 | \f |
| 2383 | /* Fill in contents in the linker allocated gregs. Everything is |
| 2384 | calculated at this point; we just move the contents into place here. */ |
| 2385 | |
| 2386 | bfd_boolean |
| 2387 | _bfd_mmix_after_linker_allocation (bfd *abfd ATTRIBUTE_UNUSED, |
| 2388 | struct bfd_link_info *link_info) |
| 2389 | { |
| 2390 | asection *bpo_gregs_section; |
| 2391 | bfd *bpo_greg_owner; |
| 2392 | struct bpo_greg_section_info *gregdata; |
| 2393 | size_t n_gregs; |
| 2394 | size_t i, j; |
| 2395 | size_t lastreg; |
| 2396 | bfd_byte *contents; |
| 2397 | |
| 2398 | /* The bpo_greg_owner bfd is supposed to have been set by mmix_elf_check_relocs |
| 2399 | when the first R_MMIX_BASE_PLUS_OFFSET is seen. If there is no such |
| 2400 | object, there was no R_MMIX_BASE_PLUS_OFFSET. */ |
| 2401 | bpo_greg_owner = (bfd *) link_info->base_file; |
| 2402 | if (bpo_greg_owner == NULL) |
| 2403 | return TRUE; |
| 2404 | |
| 2405 | bpo_gregs_section |
| 2406 | = bfd_get_section_by_name (bpo_greg_owner, |
| 2407 | MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); |
| 2408 | |
| 2409 | /* This can't happen without DSO handling. When DSOs are handled |
| 2410 | without any R_MMIX_BASE_PLUS_OFFSET seen, there will be no such |
| 2411 | section. */ |
| 2412 | if (bpo_gregs_section == NULL) |
| 2413 | return TRUE; |
| 2414 | |
| 2415 | /* We use the target-data handle in the ELF section data. */ |
| 2416 | |
| 2417 | gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; |
| 2418 | if (gregdata == NULL) |
| 2419 | return FALSE; |
| 2420 | |
| 2421 | n_gregs = gregdata->n_allocated_bpo_gregs; |
| 2422 | |
| 2423 | bpo_gregs_section->contents |
| 2424 | = contents = bfd_alloc (bpo_greg_owner, bpo_gregs_section->size); |
| 2425 | if (contents == NULL) |
| 2426 | return FALSE; |
| 2427 | |
| 2428 | /* Sanity check: If these numbers mismatch, some relocation has not been |
| 2429 | accounted for and the rest of gregdata is probably inconsistent. |
| 2430 | It's a bug, but it's more helpful to identify it than segfaulting |
| 2431 | below. */ |
| 2432 | if (gregdata->n_remaining_bpo_relocs_this_relaxation_round |
| 2433 | != gregdata->n_bpo_relocs) |
| 2434 | { |
| 2435 | (*_bfd_error_handler) |
| 2436 | (_("Internal inconsistency: remaining %u != max %u.\n\ |
| 2437 | Please report this bug."), |
| 2438 | gregdata->n_remaining_bpo_relocs_this_relaxation_round, |
| 2439 | gregdata->n_bpo_relocs); |
| 2440 | return FALSE; |
| 2441 | } |
| 2442 | |
| 2443 | for (lastreg = 255, i = 0, j = 0; j < n_gregs; i++) |
| 2444 | if (gregdata->reloc_request[i].regindex != lastreg) |
| 2445 | { |
| 2446 | bfd_put_64 (bpo_greg_owner, gregdata->reloc_request[i].value, |
| 2447 | contents + j * 8); |
| 2448 | lastreg = gregdata->reloc_request[i].regindex; |
| 2449 | j++; |
| 2450 | } |
| 2451 | |
| 2452 | return TRUE; |
| 2453 | } |
| 2454 | |
| 2455 | /* Sort valid relocs to come before non-valid relocs, then on increasing |
| 2456 | value. */ |
| 2457 | |
| 2458 | static int |
| 2459 | bpo_reloc_request_sort_fn (const void * p1, const void * p2) |
| 2460 | { |
| 2461 | const struct bpo_reloc_request *r1 = (const struct bpo_reloc_request *) p1; |
| 2462 | const struct bpo_reloc_request *r2 = (const struct bpo_reloc_request *) p2; |
| 2463 | |
| 2464 | /* Primary function is validity; non-valid relocs sorted after valid |
| 2465 | ones. */ |
| 2466 | if (r1->valid != r2->valid) |
| 2467 | return r2->valid - r1->valid; |
| 2468 | |
| 2469 | /* Then sort on value. Don't simplify and return just the difference of |
| 2470 | the values: the upper bits of the 64-bit value would be truncated on |
| 2471 | a host with 32-bit ints. */ |
| 2472 | if (r1->value != r2->value) |
| 2473 | return r1->value > r2->value ? 1 : -1; |
| 2474 | |
| 2475 | /* As a last re-sort, use the relocation number, so we get a stable |
| 2476 | sort. The *addresses* aren't stable since items are swapped during |
| 2477 | sorting. It depends on the qsort implementation if this actually |
| 2478 | happens. */ |
| 2479 | return r1->bpo_reloc_no > r2->bpo_reloc_no |
| 2480 | ? 1 : (r1->bpo_reloc_no < r2->bpo_reloc_no ? -1 : 0); |
| 2481 | } |
| 2482 | |
| 2483 | /* For debug use only. Dumps the global register allocations resulting |
| 2484 | from base-plus-offset relocs. */ |
| 2485 | |
| 2486 | void |
| 2487 | mmix_dump_bpo_gregs (link_info, pf) |
| 2488 | struct bfd_link_info *link_info; |
| 2489 | bfd_error_handler_type pf; |
| 2490 | { |
| 2491 | bfd *bpo_greg_owner; |
| 2492 | asection *bpo_gregs_section; |
| 2493 | struct bpo_greg_section_info *gregdata; |
| 2494 | unsigned int i; |
| 2495 | |
| 2496 | if (link_info == NULL || link_info->base_file == NULL) |
| 2497 | return; |
| 2498 | |
| 2499 | bpo_greg_owner = (bfd *) link_info->base_file; |
| 2500 | |
| 2501 | bpo_gregs_section |
| 2502 | = bfd_get_section_by_name (bpo_greg_owner, |
| 2503 | MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); |
| 2504 | |
| 2505 | if (bpo_gregs_section == NULL) |
| 2506 | return; |
| 2507 | |
| 2508 | gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; |
| 2509 | if (gregdata == NULL) |
| 2510 | return; |
| 2511 | |
| 2512 | if (pf == NULL) |
| 2513 | pf = _bfd_error_handler; |
| 2514 | |
| 2515 | /* These format strings are not translated. They are for debug purposes |
| 2516 | only and never displayed to an end user. Should they escape, we |
| 2517 | surely want them in original. */ |
| 2518 | (*pf) (" n_bpo_relocs: %u\n n_max_bpo_relocs: %u\n n_remain...round: %u\n\ |
| 2519 | n_allocated_bpo_gregs: %u\n", gregdata->n_bpo_relocs, |
| 2520 | gregdata->n_max_bpo_relocs, |
| 2521 | gregdata->n_remaining_bpo_relocs_this_relaxation_round, |
| 2522 | gregdata->n_allocated_bpo_gregs); |
| 2523 | |
| 2524 | if (gregdata->reloc_request) |
| 2525 | for (i = 0; i < gregdata->n_max_bpo_relocs; i++) |
| 2526 | (*pf) ("%4u (%4u)/%4u#%u: 0x%08lx%08lx r: %3u o: %3u\n", |
| 2527 | i, |
| 2528 | (gregdata->bpo_reloc_indexes != NULL |
| 2529 | ? gregdata->bpo_reloc_indexes[i] : (size_t) -1), |
| 2530 | gregdata->reloc_request[i].bpo_reloc_no, |
| 2531 | gregdata->reloc_request[i].valid, |
| 2532 | |
| 2533 | (unsigned long) (gregdata->reloc_request[i].value >> 32), |
| 2534 | (unsigned long) gregdata->reloc_request[i].value, |
| 2535 | gregdata->reloc_request[i].regindex, |
| 2536 | gregdata->reloc_request[i].offset); |
| 2537 | } |
| 2538 | |
| 2539 | /* This links all R_MMIX_BASE_PLUS_OFFSET relocs into a special array, and |
| 2540 | when the last such reloc is done, an index-array is sorted according to |
| 2541 | the values and iterated over to produce register numbers (indexed by 0 |
| 2542 | from the first allocated register number) and offsets for use in real |
| 2543 | relocation. (N.B.: Relocatable runs are handled, not just punted.) |
| 2544 | |
| 2545 | PUSHJ stub accounting is also done here. |
| 2546 | |
| 2547 | Symbol- and reloc-reading infrastructure copied from elf-m10200.c. */ |
| 2548 | |
| 2549 | static bfd_boolean |
| 2550 | mmix_elf_relax_section (bfd *abfd, |
| 2551 | asection *sec, |
| 2552 | struct bfd_link_info *link_info, |
| 2553 | bfd_boolean *again) |
| 2554 | { |
| 2555 | Elf_Internal_Shdr *symtab_hdr; |
| 2556 | Elf_Internal_Rela *internal_relocs; |
| 2557 | Elf_Internal_Rela *irel, *irelend; |
| 2558 | asection *bpo_gregs_section = NULL; |
| 2559 | struct bpo_greg_section_info *gregdata; |
| 2560 | struct bpo_reloc_section_info *bpodata |
| 2561 | = mmix_elf_section_data (sec)->bpo.reloc; |
| 2562 | /* The initialization is to quiet compiler warnings. The value is to |
| 2563 | spot a missing actual initialization. */ |
| 2564 | size_t bpono = (size_t) -1; |
| 2565 | size_t pjsno = 0; |
| 2566 | Elf_Internal_Sym *isymbuf = NULL; |
| 2567 | bfd_size_type size = sec->rawsize ? sec->rawsize : sec->size; |
| 2568 | |
| 2569 | mmix_elf_section_data (sec)->pjs.stubs_size_sum = 0; |
| 2570 | |
| 2571 | /* Assume nothing changes. */ |
| 2572 | *again = FALSE; |
| 2573 | |
| 2574 | /* We don't have to do anything if this section does not have relocs, or |
| 2575 | if this is not a code section. */ |
| 2576 | if ((sec->flags & SEC_RELOC) == 0 |
| 2577 | || sec->reloc_count == 0 |
| 2578 | || (sec->flags & SEC_CODE) == 0 |
| 2579 | || (sec->flags & SEC_LINKER_CREATED) != 0 |
| 2580 | /* If no R_MMIX_BASE_PLUS_OFFSET relocs and no PUSHJ-stub relocs, |
| 2581 | then nothing to do. */ |
| 2582 | || (bpodata == NULL |
| 2583 | && mmix_elf_section_data (sec)->pjs.n_pushj_relocs == 0)) |
| 2584 | return TRUE; |
| 2585 | |
| 2586 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 2587 | |
| 2588 | if (bpodata != NULL) |
| 2589 | { |
| 2590 | bpo_gregs_section = bpodata->bpo_greg_section; |
| 2591 | gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; |
| 2592 | bpono = bpodata->first_base_plus_offset_reloc; |
| 2593 | } |
| 2594 | else |
| 2595 | gregdata = NULL; |
| 2596 | |
| 2597 | /* Get a copy of the native relocations. */ |
| 2598 | internal_relocs |
| 2599 | = _bfd_elf_link_read_relocs (abfd, sec, NULL, |
| 2600 | (Elf_Internal_Rela *) NULL, |
| 2601 | link_info->keep_memory); |
| 2602 | if (internal_relocs == NULL) |
| 2603 | goto error_return; |
| 2604 | |
| 2605 | /* Walk through them looking for relaxing opportunities. */ |
| 2606 | irelend = internal_relocs + sec->reloc_count; |
| 2607 | for (irel = internal_relocs; irel < irelend; irel++) |
| 2608 | { |
| 2609 | bfd_vma symval; |
| 2610 | struct elf_link_hash_entry *h = NULL; |
| 2611 | |
| 2612 | /* We only process two relocs. */ |
| 2613 | if (ELF64_R_TYPE (irel->r_info) != (int) R_MMIX_BASE_PLUS_OFFSET |
| 2614 | && ELF64_R_TYPE (irel->r_info) != (int) R_MMIX_PUSHJ_STUBBABLE) |
| 2615 | continue; |
| 2616 | |
| 2617 | /* We process relocs in a distinctly different way when this is a |
| 2618 | relocatable link (for one, we don't look at symbols), so we avoid |
| 2619 | mixing its code with that for the "normal" relaxation. */ |
| 2620 | if (link_info->relocatable) |
| 2621 | { |
| 2622 | /* The only transformation in a relocatable link is to generate |
| 2623 | a full stub at the location of the stub calculated for the |
| 2624 | input section, if the relocated stub location, the end of the |
| 2625 | output section plus earlier stubs, cannot be reached. Thus |
| 2626 | relocatable linking can only lead to worse code, but it still |
| 2627 | works. */ |
| 2628 | if (ELF64_R_TYPE (irel->r_info) == R_MMIX_PUSHJ_STUBBABLE) |
| 2629 | { |
| 2630 | /* If we can reach the end of the output-section and beyond |
| 2631 | any current stubs, then we don't need a stub for this |
| 2632 | reloc. The relaxed order of output stub allocation may |
| 2633 | not exactly match the straightforward order, so we always |
| 2634 | assume presence of output stubs, which will allow |
| 2635 | relaxation only on relocations indifferent to the |
| 2636 | presence of output stub allocations for other relocations |
| 2637 | and thus the order of output stub allocation. */ |
| 2638 | if (bfd_check_overflow (complain_overflow_signed, |
| 2639 | 19, |
| 2640 | 0, |
| 2641 | bfd_arch_bits_per_address (abfd), |
| 2642 | /* Output-stub location. */ |
| 2643 | sec->output_section->rawsize |
| 2644 | + (mmix_elf_section_data (sec |
| 2645 | ->output_section) |
| 2646 | ->pjs.stubs_size_sum) |
| 2647 | /* Location of this PUSHJ reloc. */ |
| 2648 | - (sec->output_offset + irel->r_offset) |
| 2649 | /* Don't count *this* stub twice. */ |
| 2650 | - (mmix_elf_section_data (sec) |
| 2651 | ->pjs.stub_size[pjsno] |
| 2652 | + MAX_PUSHJ_STUB_SIZE)) |
| 2653 | == bfd_reloc_ok) |
| 2654 | mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 0; |
| 2655 | |
| 2656 | mmix_elf_section_data (sec)->pjs.stubs_size_sum |
| 2657 | += mmix_elf_section_data (sec)->pjs.stub_size[pjsno]; |
| 2658 | |
| 2659 | pjsno++; |
| 2660 | } |
| 2661 | |
| 2662 | continue; |
| 2663 | } |
| 2664 | |
| 2665 | /* Get the value of the symbol referred to by the reloc. */ |
| 2666 | if (ELF64_R_SYM (irel->r_info) < symtab_hdr->sh_info) |
| 2667 | { |
| 2668 | /* A local symbol. */ |
| 2669 | Elf_Internal_Sym *isym; |
| 2670 | asection *sym_sec; |
| 2671 | |
| 2672 | /* Read this BFD's local symbols if we haven't already. */ |
| 2673 | if (isymbuf == NULL) |
| 2674 | { |
| 2675 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 2676 | if (isymbuf == NULL) |
| 2677 | isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, |
| 2678 | symtab_hdr->sh_info, 0, |
| 2679 | NULL, NULL, NULL); |
| 2680 | if (isymbuf == 0) |
| 2681 | goto error_return; |
| 2682 | } |
| 2683 | |
| 2684 | isym = isymbuf + ELF64_R_SYM (irel->r_info); |
| 2685 | if (isym->st_shndx == SHN_UNDEF) |
| 2686 | sym_sec = bfd_und_section_ptr; |
| 2687 | else if (isym->st_shndx == SHN_ABS) |
| 2688 | sym_sec = bfd_abs_section_ptr; |
| 2689 | else if (isym->st_shndx == SHN_COMMON) |
| 2690 | sym_sec = bfd_com_section_ptr; |
| 2691 | else |
| 2692 | sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| 2693 | symval = (isym->st_value |
| 2694 | + sym_sec->output_section->vma |
| 2695 | + sym_sec->output_offset); |
| 2696 | } |
| 2697 | else |
| 2698 | { |
| 2699 | unsigned long indx; |
| 2700 | |
| 2701 | /* An external symbol. */ |
| 2702 | indx = ELF64_R_SYM (irel->r_info) - symtab_hdr->sh_info; |
| 2703 | h = elf_sym_hashes (abfd)[indx]; |
| 2704 | BFD_ASSERT (h != NULL); |
| 2705 | if (h->root.type != bfd_link_hash_defined |
| 2706 | && h->root.type != bfd_link_hash_defweak) |
| 2707 | { |
| 2708 | /* This appears to be a reference to an undefined symbol. Just |
| 2709 | ignore it--it will be caught by the regular reloc processing. |
| 2710 | We need to keep BPO reloc accounting consistent, though |
| 2711 | else we'll abort instead of emitting an error message. */ |
| 2712 | if (ELF64_R_TYPE (irel->r_info) == R_MMIX_BASE_PLUS_OFFSET |
| 2713 | && gregdata != NULL) |
| 2714 | { |
| 2715 | gregdata->n_remaining_bpo_relocs_this_relaxation_round--; |
| 2716 | bpono++; |
| 2717 | } |
| 2718 | continue; |
| 2719 | } |
| 2720 | |
| 2721 | symval = (h->root.u.def.value |
| 2722 | + h->root.u.def.section->output_section->vma |
| 2723 | + h->root.u.def.section->output_offset); |
| 2724 | } |
| 2725 | |
| 2726 | if (ELF64_R_TYPE (irel->r_info) == (int) R_MMIX_PUSHJ_STUBBABLE) |
| 2727 | { |
| 2728 | bfd_vma value = symval + irel->r_addend; |
| 2729 | bfd_vma dot |
| 2730 | = (sec->output_section->vma |
| 2731 | + sec->output_offset |
| 2732 | + irel->r_offset); |
| 2733 | bfd_vma stubaddr |
| 2734 | = (sec->output_section->vma |
| 2735 | + sec->output_offset |
| 2736 | + size |
| 2737 | + mmix_elf_section_data (sec)->pjs.stubs_size_sum); |
| 2738 | |
| 2739 | if ((value & 3) == 0 |
| 2740 | && bfd_check_overflow (complain_overflow_signed, |
| 2741 | 19, |
| 2742 | 0, |
| 2743 | bfd_arch_bits_per_address (abfd), |
| 2744 | value - dot |
| 2745 | - (value > dot |
| 2746 | ? mmix_elf_section_data (sec) |
| 2747 | ->pjs.stub_size[pjsno] |
| 2748 | : 0)) |
| 2749 | == bfd_reloc_ok) |
| 2750 | /* If the reloc fits, no stub is needed. */ |
| 2751 | mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 0; |
| 2752 | else |
| 2753 | /* Maybe we can get away with just a JMP insn? */ |
| 2754 | if ((value & 3) == 0 |
| 2755 | && bfd_check_overflow (complain_overflow_signed, |
| 2756 | 27, |
| 2757 | 0, |
| 2758 | bfd_arch_bits_per_address (abfd), |
| 2759 | value - stubaddr |
| 2760 | - (value > dot |
| 2761 | ? mmix_elf_section_data (sec) |
| 2762 | ->pjs.stub_size[pjsno] - 4 |
| 2763 | : 0)) |
| 2764 | == bfd_reloc_ok) |
| 2765 | /* Yep, account for a stub consisting of a single JMP insn. */ |
| 2766 | mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 4; |
| 2767 | else |
| 2768 | /* Nope, go for the full insn stub. It doesn't seem useful to |
| 2769 | emit the intermediate sizes; those will only be useful for |
| 2770 | a >64M program assuming contiguous code. */ |
| 2771 | mmix_elf_section_data (sec)->pjs.stub_size[pjsno] |
| 2772 | = MAX_PUSHJ_STUB_SIZE; |
| 2773 | |
| 2774 | mmix_elf_section_data (sec)->pjs.stubs_size_sum |
| 2775 | += mmix_elf_section_data (sec)->pjs.stub_size[pjsno]; |
| 2776 | pjsno++; |
| 2777 | continue; |
| 2778 | } |
| 2779 | |
| 2780 | /* We're looking at a R_MMIX_BASE_PLUS_OFFSET reloc. */ |
| 2781 | |
| 2782 | gregdata->reloc_request[gregdata->bpo_reloc_indexes[bpono]].value |
| 2783 | = symval + irel->r_addend; |
| 2784 | gregdata->reloc_request[gregdata->bpo_reloc_indexes[bpono++]].valid = TRUE; |
| 2785 | gregdata->n_remaining_bpo_relocs_this_relaxation_round--; |
| 2786 | } |
| 2787 | |
| 2788 | /* Check if that was the last BPO-reloc. If so, sort the values and |
| 2789 | calculate how many registers we need to cover them. Set the size of |
| 2790 | the linker gregs, and if the number of registers changed, indicate |
| 2791 | that we need to relax some more because we have more work to do. */ |
| 2792 | if (gregdata != NULL |
| 2793 | && gregdata->n_remaining_bpo_relocs_this_relaxation_round == 0) |
| 2794 | { |
| 2795 | size_t i; |
| 2796 | bfd_vma prev_base; |
| 2797 | size_t regindex; |
| 2798 | |
| 2799 | /* First, reset the remaining relocs for the next round. */ |
| 2800 | gregdata->n_remaining_bpo_relocs_this_relaxation_round |
| 2801 | = gregdata->n_bpo_relocs; |
| 2802 | |
| 2803 | qsort (gregdata->reloc_request, |
| 2804 | gregdata->n_max_bpo_relocs, |
| 2805 | sizeof (struct bpo_reloc_request), |
| 2806 | bpo_reloc_request_sort_fn); |
| 2807 | |
| 2808 | /* Recalculate indexes. When we find a change (however unlikely |
| 2809 | after the initial iteration), we know we need to relax again, |
| 2810 | since items in the GREG-array are sorted by increasing value and |
| 2811 | stored in the relaxation phase. */ |
| 2812 | for (i = 0; i < gregdata->n_max_bpo_relocs; i++) |
| 2813 | if (gregdata->bpo_reloc_indexes[gregdata->reloc_request[i].bpo_reloc_no] |
| 2814 | != i) |
| 2815 | { |
| 2816 | gregdata->bpo_reloc_indexes[gregdata->reloc_request[i].bpo_reloc_no] |
| 2817 | = i; |
| 2818 | *again = TRUE; |
| 2819 | } |
| 2820 | |
| 2821 | /* Allocate register numbers (indexing from 0). Stop at the first |
| 2822 | non-valid reloc. */ |
| 2823 | for (i = 0, regindex = 0, prev_base = gregdata->reloc_request[0].value; |
| 2824 | i < gregdata->n_bpo_relocs; |
| 2825 | i++) |
| 2826 | { |
| 2827 | if (gregdata->reloc_request[i].value > prev_base + 255) |
| 2828 | { |
| 2829 | regindex++; |
| 2830 | prev_base = gregdata->reloc_request[i].value; |
| 2831 | } |
| 2832 | gregdata->reloc_request[i].regindex = regindex; |
| 2833 | gregdata->reloc_request[i].offset |
| 2834 | = gregdata->reloc_request[i].value - prev_base; |
| 2835 | } |
| 2836 | |
| 2837 | /* If it's not the same as the last time, we need to relax again, |
| 2838 | because the size of the section has changed. I'm not sure we |
| 2839 | actually need to do any adjustments since the shrinking happens |
| 2840 | at the start of this section, but better safe than sorry. */ |
| 2841 | if (gregdata->n_allocated_bpo_gregs != regindex + 1) |
| 2842 | { |
| 2843 | gregdata->n_allocated_bpo_gregs = regindex + 1; |
| 2844 | *again = TRUE; |
| 2845 | } |
| 2846 | |
| 2847 | bpo_gregs_section->size = (regindex + 1) * 8; |
| 2848 | } |
| 2849 | |
| 2850 | if (isymbuf != NULL && (unsigned char *) isymbuf != symtab_hdr->contents) |
| 2851 | { |
| 2852 | if (! link_info->keep_memory) |
| 2853 | free (isymbuf); |
| 2854 | else |
| 2855 | { |
| 2856 | /* Cache the symbols for elf_link_input_bfd. */ |
| 2857 | symtab_hdr->contents = (unsigned char *) isymbuf; |
| 2858 | } |
| 2859 | } |
| 2860 | |
| 2861 | if (internal_relocs != NULL |
| 2862 | && elf_section_data (sec)->relocs != internal_relocs) |
| 2863 | free (internal_relocs); |
| 2864 | |
| 2865 | if (sec->size < size + mmix_elf_section_data (sec)->pjs.stubs_size_sum) |
| 2866 | abort (); |
| 2867 | |
| 2868 | if (sec->size > size + mmix_elf_section_data (sec)->pjs.stubs_size_sum) |
| 2869 | { |
| 2870 | sec->size = size + mmix_elf_section_data (sec)->pjs.stubs_size_sum; |
| 2871 | *again = TRUE; |
| 2872 | } |
| 2873 | |
| 2874 | return TRUE; |
| 2875 | |
| 2876 | error_return: |
| 2877 | if (isymbuf != NULL && (unsigned char *) isymbuf != symtab_hdr->contents) |
| 2878 | free (isymbuf); |
| 2879 | if (internal_relocs != NULL |
| 2880 | && elf_section_data (sec)->relocs != internal_relocs) |
| 2881 | free (internal_relocs); |
| 2882 | return FALSE; |
| 2883 | } |
| 2884 | \f |
| 2885 | #define ELF_ARCH bfd_arch_mmix |
| 2886 | #define ELF_MACHINE_CODE EM_MMIX |
| 2887 | |
| 2888 | /* According to mmix-doc page 36 (paragraph 45), this should be (1LL << 48LL). |
| 2889 | However, that's too much for something somewhere in the linker part of |
| 2890 | BFD; perhaps the start-address has to be a non-zero multiple of this |
| 2891 | number, or larger than this number. The symptom is that the linker |
| 2892 | complains: "warning: allocated section `.text' not in segment". We |
| 2893 | settle for 64k; the page-size used in examples is 8k. |
| 2894 | #define ELF_MAXPAGESIZE 0x10000 |
| 2895 | |
| 2896 | Unfortunately, this causes excessive padding in the supposedly small |
| 2897 | for-education programs that are the expected usage (where people would |
| 2898 | inspect output). We stick to 256 bytes just to have *some* default |
| 2899 | alignment. */ |
| 2900 | #define ELF_MAXPAGESIZE 0x100 |
| 2901 | |
| 2902 | #define TARGET_BIG_SYM bfd_elf64_mmix_vec |
| 2903 | #define TARGET_BIG_NAME "elf64-mmix" |
| 2904 | |
| 2905 | #define elf_info_to_howto_rel NULL |
| 2906 | #define elf_info_to_howto mmix_info_to_howto_rela |
| 2907 | #define elf_backend_relocate_section mmix_elf_relocate_section |
| 2908 | #define elf_backend_gc_mark_hook mmix_elf_gc_mark_hook |
| 2909 | #define elf_backend_gc_sweep_hook mmix_elf_gc_sweep_hook |
| 2910 | |
| 2911 | #define elf_backend_link_output_symbol_hook \ |
| 2912 | mmix_elf_link_output_symbol_hook |
| 2913 | #define elf_backend_add_symbol_hook mmix_elf_add_symbol_hook |
| 2914 | |
| 2915 | #define elf_backend_check_relocs mmix_elf_check_relocs |
| 2916 | #define elf_backend_symbol_processing mmix_elf_symbol_processing |
| 2917 | #define elf_backend_omit_section_dynsym \ |
| 2918 | ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true) |
| 2919 | |
| 2920 | #define bfd_elf64_bfd_is_local_label_name \ |
| 2921 | mmix_elf_is_local_label_name |
| 2922 | |
| 2923 | #define elf_backend_may_use_rel_p 0 |
| 2924 | #define elf_backend_may_use_rela_p 1 |
| 2925 | #define elf_backend_default_use_rela_p 1 |
| 2926 | |
| 2927 | #define elf_backend_can_gc_sections 1 |
| 2928 | #define elf_backend_section_from_bfd_section \ |
| 2929 | mmix_elf_section_from_bfd_section |
| 2930 | |
| 2931 | #define bfd_elf64_new_section_hook mmix_elf_new_section_hook |
| 2932 | #define bfd_elf64_bfd_final_link mmix_elf_final_link |
| 2933 | #define bfd_elf64_bfd_relax_section mmix_elf_relax_section |
| 2934 | |
| 2935 | #include "elf64-target.h" |