| 1 | /* FR30-specific support for 32-bit ELF. |
| 2 | Copyright 1998, 1999, 2000, 2001 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of BFD, the Binary File Descriptor library. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 19 | |
| 20 | #include "bfd.h" |
| 21 | #include "sysdep.h" |
| 22 | #include "libbfd.h" |
| 23 | #include "elf-bfd.h" |
| 24 | #include "elf/fr30.h" |
| 25 | |
| 26 | /* Forward declarations. */ |
| 27 | static bfd_reloc_status_type fr30_elf_i20_reloc |
| 28 | PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); |
| 29 | static bfd_reloc_status_type fr30_elf_i32_reloc |
| 30 | PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); |
| 31 | static reloc_howto_type * fr30_reloc_type_lookup |
| 32 | PARAMS ((bfd *abfd, bfd_reloc_code_real_type code)); |
| 33 | static void fr30_info_to_howto_rela |
| 34 | PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *)); |
| 35 | static boolean fr30_elf_relocate_section |
| 36 | PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, |
| 37 | Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); |
| 38 | static bfd_reloc_status_type fr30_final_link_relocate |
| 39 | PARAMS ((reloc_howto_type *, bfd *, asection *, bfd_byte *, |
| 40 | Elf_Internal_Rela *, bfd_vma)); |
| 41 | static boolean fr30_elf_gc_sweep_hook |
| 42 | PARAMS ((bfd *, struct bfd_link_info *, asection *, |
| 43 | const Elf_Internal_Rela *)); |
| 44 | static asection * fr30_elf_gc_mark_hook |
| 45 | PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *, |
| 46 | struct elf_link_hash_entry *, Elf_Internal_Sym *)); |
| 47 | static boolean fr30_elf_check_relocs |
| 48 | PARAMS ((bfd *, struct bfd_link_info *, asection *, |
| 49 | const Elf_Internal_Rela *)); |
| 50 | |
| 51 | static reloc_howto_type fr30_elf_howto_table [] = |
| 52 | { |
| 53 | /* This reloc does nothing. */ |
| 54 | HOWTO (R_FR30_NONE, /* type */ |
| 55 | 0, /* rightshift */ |
| 56 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 57 | 32, /* bitsize */ |
| 58 | false, /* pc_relative */ |
| 59 | 0, /* bitpos */ |
| 60 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 61 | bfd_elf_generic_reloc, /* special_function */ |
| 62 | "R_FR30_NONE", /* name */ |
| 63 | false, /* partial_inplace */ |
| 64 | 0, /* src_mask */ |
| 65 | 0, /* dst_mask */ |
| 66 | false), /* pcrel_offset */ |
| 67 | |
| 68 | /* An 8 bit absolute relocation. */ |
| 69 | HOWTO (R_FR30_8, /* type */ |
| 70 | 0, /* rightshift */ |
| 71 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 72 | 8, /* bitsize */ |
| 73 | false, /* pc_relative */ |
| 74 | 4, /* bitpos */ |
| 75 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 76 | bfd_elf_generic_reloc, /* special_function */ |
| 77 | "R_FR30_8", /* name */ |
| 78 | true, /* partial_inplace */ |
| 79 | 0x0000, /* src_mask */ |
| 80 | 0x0ff0, /* dst_mask */ |
| 81 | false), /* pcrel_offset */ |
| 82 | |
| 83 | /* A 20 bit absolute relocation. */ |
| 84 | HOWTO (R_FR30_20, /* type */ |
| 85 | 0, /* rightshift */ |
| 86 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 87 | 20, /* bitsize */ |
| 88 | false, /* pc_relative */ |
| 89 | 0, /* bitpos */ |
| 90 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 91 | fr30_elf_i20_reloc, /* special_function */ |
| 92 | "R_FR30_20", /* name */ |
| 93 | true, /* partial_inplace */ |
| 94 | 0x00000000, /* src_mask */ |
| 95 | 0x00f0ffff, /* dst_mask */ |
| 96 | false), /* pcrel_offset */ |
| 97 | |
| 98 | /* A 32 bit absolute relocation. */ |
| 99 | HOWTO (R_FR30_32, /* type */ |
| 100 | 0, /* rightshift */ |
| 101 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 102 | 32, /* bitsize */ |
| 103 | false, /* pc_relative */ |
| 104 | 0, /* bitpos */ |
| 105 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 106 | bfd_elf_generic_reloc, /* special_function */ |
| 107 | "R_FR30_32", /* name */ |
| 108 | true, /* partial_inplace */ |
| 109 | 0x00000000, /* src_mask */ |
| 110 | 0xffffffff, /* dst_mask */ |
| 111 | false), /* pcrel_offset */ |
| 112 | |
| 113 | /* A 32 bit into 48 bits absolute relocation. */ |
| 114 | HOWTO (R_FR30_48, /* type */ |
| 115 | 0, /* rightshift */ |
| 116 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 117 | 32, /* bitsize */ |
| 118 | false, /* pc_relative */ |
| 119 | 0, /* bitpos */ |
| 120 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 121 | fr30_elf_i32_reloc, /* special_function */ |
| 122 | "R_FR30_48", /* name */ |
| 123 | true, /* partial_inplace */ |
| 124 | 0x00000000, /* src_mask */ |
| 125 | 0xffffffff, /* dst_mask */ |
| 126 | false), /* pcrel_offset */ |
| 127 | |
| 128 | /* A 6 bit absolute relocation. */ |
| 129 | HOWTO (R_FR30_6_IN_4, /* type */ |
| 130 | 2, /* rightshift */ |
| 131 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 132 | 6, /* bitsize */ |
| 133 | false, /* pc_relative */ |
| 134 | 4, /* bitpos */ |
| 135 | complain_overflow_unsigned, /* complain_on_overflow */ |
| 136 | bfd_elf_generic_reloc, /* special_function */ |
| 137 | "R_FR30_6_IN_4", /* name */ |
| 138 | true, /* partial_inplace */ |
| 139 | 0x0000, /* src_mask */ |
| 140 | 0x00f0, /* dst_mask */ |
| 141 | false), /* pcrel_offset */ |
| 142 | |
| 143 | /* An 8 bit absolute relocation. */ |
| 144 | HOWTO (R_FR30_8_IN_8, /* type */ |
| 145 | 0, /* rightshift */ |
| 146 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 147 | 8, /* bitsize */ |
| 148 | false, /* pc_relative */ |
| 149 | 4, /* bitpos */ |
| 150 | complain_overflow_signed, /* complain_on_overflow */ |
| 151 | bfd_elf_generic_reloc,/* special_function */ |
| 152 | "R_FR30_8_IN_8", /* name */ |
| 153 | true, /* partial_inplace */ |
| 154 | 0x0000, /* src_mask */ |
| 155 | 0x0ff0, /* dst_mask */ |
| 156 | false), /* pcrel_offset */ |
| 157 | |
| 158 | /* A 9 bit absolute relocation. */ |
| 159 | HOWTO (R_FR30_9_IN_8, /* type */ |
| 160 | 1, /* rightshift */ |
| 161 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 162 | 9, /* bitsize */ |
| 163 | false, /* pc_relative */ |
| 164 | 4, /* bitpos */ |
| 165 | complain_overflow_signed, /* complain_on_overflow */ |
| 166 | bfd_elf_generic_reloc,/* special_function */ |
| 167 | "R_FR30_9_IN_8", /* name */ |
| 168 | true, /* partial_inplace */ |
| 169 | 0x0000, /* src_mask */ |
| 170 | 0x0ff0, /* dst_mask */ |
| 171 | false), /* pcrel_offset */ |
| 172 | |
| 173 | /* A 10 bit absolute relocation. */ |
| 174 | HOWTO (R_FR30_10_IN_8, /* type */ |
| 175 | 2, /* rightshift */ |
| 176 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 177 | 10, /* bitsize */ |
| 178 | false, /* pc_relative */ |
| 179 | 4, /* bitpos */ |
| 180 | complain_overflow_signed, /* complain_on_overflow */ |
| 181 | bfd_elf_generic_reloc,/* special_function */ |
| 182 | "R_FR30_10_IN_8", /* name */ |
| 183 | true, /* partial_inplace */ |
| 184 | 0x0000, /* src_mask */ |
| 185 | 0x0ff0, /* dst_mask */ |
| 186 | false), /* pcrel_offset */ |
| 187 | |
| 188 | /* A PC relative 9 bit relocation, right shifted by 1. */ |
| 189 | HOWTO (R_FR30_9_PCREL, /* type */ |
| 190 | 1, /* rightshift */ |
| 191 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 192 | 9, /* bitsize */ |
| 193 | true, /* pc_relative */ |
| 194 | 0, /* bitpos */ |
| 195 | complain_overflow_signed, /* complain_on_overflow */ |
| 196 | bfd_elf_generic_reloc, /* special_function */ |
| 197 | "R_FR30_9_PCREL", /* name */ |
| 198 | false, /* partial_inplace */ |
| 199 | 0x0000, /* src_mask */ |
| 200 | 0x00ff, /* dst_mask */ |
| 201 | false), /* pcrel_offset */ |
| 202 | |
| 203 | /* A PC relative 12 bit relocation, right shifted by 1. */ |
| 204 | HOWTO (R_FR30_12_PCREL, /* type */ |
| 205 | 1, /* rightshift */ |
| 206 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 207 | 12, /* bitsize */ |
| 208 | true, /* pc_relative */ |
| 209 | 0, /* bitpos */ |
| 210 | complain_overflow_signed, /* complain_on_overflow */ |
| 211 | bfd_elf_generic_reloc, /* special_function */ |
| 212 | "R_FR30_12_PCREL", /* name */ |
| 213 | false, /* partial_inplace */ |
| 214 | 0x0000, /* src_mask */ |
| 215 | 0x07ff, /* dst_mask */ |
| 216 | false), /* pcrel_offset */ |
| 217 | /* GNU extension to record C++ vtable hierarchy */ |
| 218 | HOWTO (R_FR30_GNU_VTINHERIT, /* type */ |
| 219 | 0, /* rightshift */ |
| 220 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 221 | 0, /* bitsize */ |
| 222 | false, /* pc_relative */ |
| 223 | 0, /* bitpos */ |
| 224 | complain_overflow_dont, /* complain_on_overflow */ |
| 225 | NULL, /* special_function */ |
| 226 | "R_FR30_GNU_VTINHERIT", /* name */ |
| 227 | false, /* partial_inplace */ |
| 228 | 0, /* src_mask */ |
| 229 | 0, /* dst_mask */ |
| 230 | false), /* pcrel_offset */ |
| 231 | |
| 232 | /* GNU extension to record C++ vtable member usage */ |
| 233 | HOWTO (R_FR30_GNU_VTENTRY, /* type */ |
| 234 | 0, /* rightshift */ |
| 235 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 236 | 0, /* bitsize */ |
| 237 | false, /* pc_relative */ |
| 238 | 0, /* bitpos */ |
| 239 | complain_overflow_dont, /* complain_on_overflow */ |
| 240 | _bfd_elf_rel_vtable_reloc_fn, /* special_function */ |
| 241 | "R_FR30_GNU_VTENTRY", /* name */ |
| 242 | false, /* partial_inplace */ |
| 243 | 0, /* src_mask */ |
| 244 | 0, /* dst_mask */ |
| 245 | false), /* pcrel_offset */ |
| 246 | }; |
| 247 | \f |
| 248 | /* Utility to actually perform an R_FR30_20 reloc. */ |
| 249 | |
| 250 | static bfd_reloc_status_type |
| 251 | fr30_elf_i20_reloc (abfd, reloc_entry, symbol, data, |
| 252 | input_section, output_bfd, error_message) |
| 253 | bfd * abfd; |
| 254 | arelent * reloc_entry; |
| 255 | asymbol * symbol; |
| 256 | PTR data; |
| 257 | asection * input_section; |
| 258 | bfd * output_bfd; |
| 259 | char ** error_message ATTRIBUTE_UNUSED; |
| 260 | { |
| 261 | bfd_vma relocation; |
| 262 | unsigned long x; |
| 263 | |
| 264 | /* This part is from bfd_elf_generic_reloc. */ |
| 265 | if (output_bfd != (bfd *) NULL |
| 266 | && (symbol->flags & BSF_SECTION_SYM) == 0 |
| 267 | && (! reloc_entry->howto->partial_inplace |
| 268 | || reloc_entry->addend == 0)) |
| 269 | { |
| 270 | reloc_entry->address += input_section->output_offset; |
| 271 | return bfd_reloc_ok; |
| 272 | } |
| 273 | |
| 274 | if (output_bfd != NULL) |
| 275 | /* FIXME: See bfd_perform_relocation. Is this right? */ |
| 276 | return bfd_reloc_ok; |
| 277 | |
| 278 | relocation = |
| 279 | symbol->value |
| 280 | + symbol->section->output_section->vma |
| 281 | + symbol->section->output_offset |
| 282 | + reloc_entry->addend; |
| 283 | |
| 284 | if (relocation > (((bfd_vma) 1 << 20) - 1)) |
| 285 | return bfd_reloc_overflow; |
| 286 | |
| 287 | x = bfd_get_32 (abfd, (char *) data + reloc_entry->address); |
| 288 | x = (x & 0xff0f0000) | (relocation & 0x0000ffff) | ((relocation & 0x000f0000) << 4); |
| 289 | bfd_put_32 (abfd, (bfd_vma) x, (char *) data + reloc_entry->address); |
| 290 | |
| 291 | return bfd_reloc_ok; |
| 292 | } |
| 293 | \f |
| 294 | /* Utility to actually perform a R_FR30_48 reloc. */ |
| 295 | |
| 296 | static bfd_reloc_status_type |
| 297 | fr30_elf_i32_reloc (abfd, reloc_entry, symbol, data, |
| 298 | input_section, output_bfd, error_message) |
| 299 | bfd * abfd; |
| 300 | arelent * reloc_entry; |
| 301 | asymbol * symbol; |
| 302 | PTR data; |
| 303 | asection * input_section; |
| 304 | bfd * output_bfd; |
| 305 | char ** error_message ATTRIBUTE_UNUSED; |
| 306 | { |
| 307 | bfd_vma relocation; |
| 308 | |
| 309 | /* This part is from bfd_elf_generic_reloc. */ |
| 310 | if (output_bfd != (bfd *) NULL |
| 311 | && (symbol->flags & BSF_SECTION_SYM) == 0 |
| 312 | && (! reloc_entry->howto->partial_inplace |
| 313 | || reloc_entry->addend == 0)) |
| 314 | { |
| 315 | reloc_entry->address += input_section->output_offset; |
| 316 | return bfd_reloc_ok; |
| 317 | } |
| 318 | |
| 319 | if (output_bfd != NULL) |
| 320 | /* FIXME: See bfd_perform_relocation. Is this right? */ |
| 321 | return bfd_reloc_ok; |
| 322 | |
| 323 | relocation = |
| 324 | symbol->value |
| 325 | + symbol->section->output_section->vma |
| 326 | + symbol->section->output_offset |
| 327 | + reloc_entry->addend; |
| 328 | |
| 329 | bfd_put_32 (abfd, relocation, (char *) data + reloc_entry->address + 2); |
| 330 | |
| 331 | return bfd_reloc_ok; |
| 332 | } |
| 333 | \f |
| 334 | /* Map BFD reloc types to FR30 ELF reloc types. */ |
| 335 | |
| 336 | struct fr30_reloc_map |
| 337 | { |
| 338 | bfd_reloc_code_real_type bfd_reloc_val; |
| 339 | unsigned int fr30_reloc_val; |
| 340 | }; |
| 341 | |
| 342 | static const struct fr30_reloc_map fr30_reloc_map [] = |
| 343 | { |
| 344 | { BFD_RELOC_NONE, R_FR30_NONE }, |
| 345 | { BFD_RELOC_8, R_FR30_8 }, |
| 346 | { BFD_RELOC_FR30_20, R_FR30_20 }, |
| 347 | { BFD_RELOC_32, R_FR30_32 }, |
| 348 | { BFD_RELOC_FR30_48, R_FR30_48 }, |
| 349 | { BFD_RELOC_FR30_6_IN_4, R_FR30_6_IN_4 }, |
| 350 | { BFD_RELOC_FR30_8_IN_8, R_FR30_8_IN_8 }, |
| 351 | { BFD_RELOC_FR30_9_IN_8, R_FR30_9_IN_8 }, |
| 352 | { BFD_RELOC_FR30_10_IN_8, R_FR30_10_IN_8 }, |
| 353 | { BFD_RELOC_FR30_9_PCREL, R_FR30_9_PCREL }, |
| 354 | { BFD_RELOC_FR30_12_PCREL, R_FR30_12_PCREL }, |
| 355 | { BFD_RELOC_VTABLE_INHERIT, R_FR30_GNU_VTINHERIT }, |
| 356 | { BFD_RELOC_VTABLE_ENTRY, R_FR30_GNU_VTENTRY }, |
| 357 | }; |
| 358 | |
| 359 | static reloc_howto_type * |
| 360 | fr30_reloc_type_lookup (abfd, code) |
| 361 | bfd * abfd ATTRIBUTE_UNUSED; |
| 362 | bfd_reloc_code_real_type code; |
| 363 | { |
| 364 | unsigned int i; |
| 365 | |
| 366 | for (i = sizeof (fr30_reloc_map) / sizeof (fr30_reloc_map[0]); |
| 367 | --i;) |
| 368 | if (fr30_reloc_map [i].bfd_reloc_val == code) |
| 369 | return & fr30_elf_howto_table [fr30_reloc_map[i].fr30_reloc_val]; |
| 370 | |
| 371 | return NULL; |
| 372 | } |
| 373 | |
| 374 | /* Set the howto pointer for an FR30 ELF reloc. */ |
| 375 | |
| 376 | static void |
| 377 | fr30_info_to_howto_rela (abfd, cache_ptr, dst) |
| 378 | bfd * abfd ATTRIBUTE_UNUSED; |
| 379 | arelent * cache_ptr; |
| 380 | Elf32_Internal_Rela * dst; |
| 381 | { |
| 382 | unsigned int r_type; |
| 383 | |
| 384 | r_type = ELF32_R_TYPE (dst->r_info); |
| 385 | BFD_ASSERT (r_type < (unsigned int) R_FR30_max); |
| 386 | cache_ptr->howto = & fr30_elf_howto_table [r_type]; |
| 387 | } |
| 388 | \f |
| 389 | /* Perform a single relocation. By default we use the standard BFD |
| 390 | routines, but a few relocs, we have to do them ourselves. */ |
| 391 | |
| 392 | static bfd_reloc_status_type |
| 393 | fr30_final_link_relocate (howto, input_bfd, input_section, contents, rel, relocation) |
| 394 | reloc_howto_type * howto; |
| 395 | bfd * input_bfd; |
| 396 | asection * input_section; |
| 397 | bfd_byte * contents; |
| 398 | Elf_Internal_Rela * rel; |
| 399 | bfd_vma relocation; |
| 400 | { |
| 401 | bfd_reloc_status_type r = bfd_reloc_ok; |
| 402 | bfd_vma x; |
| 403 | bfd_signed_vma srel; |
| 404 | |
| 405 | switch (howto->type) |
| 406 | { |
| 407 | case R_FR30_20: |
| 408 | contents += rel->r_offset; |
| 409 | relocation += rel->r_addend; |
| 410 | |
| 411 | if (relocation > ((1 << 20) - 1)) |
| 412 | return bfd_reloc_overflow; |
| 413 | |
| 414 | x = bfd_get_32 (input_bfd, contents); |
| 415 | x = (x & 0xff0f0000) | (relocation & 0x0000ffff) | ((relocation & 0x000f0000) << 4); |
| 416 | bfd_put_32 (input_bfd, x, contents); |
| 417 | break; |
| 418 | |
| 419 | case R_FR30_48: |
| 420 | contents += rel->r_offset + 2; |
| 421 | relocation += rel->r_addend; |
| 422 | bfd_put_32 (input_bfd, relocation, contents); |
| 423 | break; |
| 424 | |
| 425 | case R_FR30_9_PCREL: |
| 426 | contents += rel->r_offset + 1; |
| 427 | srel = (bfd_signed_vma) relocation; |
| 428 | srel += rel->r_addend; |
| 429 | srel -= rel->r_offset; |
| 430 | srel -= 2; /* Branch instructions add 2 to the PC... */ |
| 431 | srel -= (input_section->output_section->vma + |
| 432 | input_section->output_offset); |
| 433 | |
| 434 | if (srel & 1) |
| 435 | return bfd_reloc_outofrange; |
| 436 | if (srel > ((1 << 8) - 1) || (srel < - (1 << 8))) |
| 437 | return bfd_reloc_overflow; |
| 438 | |
| 439 | bfd_put_8 (input_bfd, srel >> 1, contents); |
| 440 | break; |
| 441 | |
| 442 | case R_FR30_12_PCREL: |
| 443 | contents += rel->r_offset; |
| 444 | srel = (bfd_signed_vma) relocation; |
| 445 | srel += rel->r_addend; |
| 446 | srel -= rel->r_offset; |
| 447 | srel -= 2; /* Branch instructions add 2 to the PC... */ |
| 448 | srel -= (input_section->output_section->vma + |
| 449 | input_section->output_offset); |
| 450 | |
| 451 | if (srel & 1) |
| 452 | return bfd_reloc_outofrange; |
| 453 | if (srel > ((1 << 11) - 1) || (srel < - (1 << 11))) |
| 454 | return bfd_reloc_overflow; |
| 455 | |
| 456 | x = bfd_get_16 (input_bfd, contents); |
| 457 | x = (x & 0xf800) | ((srel >> 1) & 0x7ff); |
| 458 | bfd_put_16 (input_bfd, x, contents); |
| 459 | break; |
| 460 | |
| 461 | default: |
| 462 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 463 | contents, rel->r_offset, |
| 464 | relocation, rel->r_addend); |
| 465 | } |
| 466 | |
| 467 | return r; |
| 468 | } |
| 469 | \f |
| 470 | /* Relocate an FR30 ELF section. |
| 471 | There is some attempt to make this function usable for many architectures, |
| 472 | both USE_REL and USE_RELA ['twould be nice if such a critter existed], |
| 473 | if only to serve as a learning tool. |
| 474 | |
| 475 | The RELOCATE_SECTION function is called by the new ELF backend linker |
| 476 | to handle the relocations for a section. |
| 477 | |
| 478 | The relocs are always passed as Rela structures; if the section |
| 479 | actually uses Rel structures, the r_addend field will always be |
| 480 | zero. |
| 481 | |
| 482 | This function is responsible for adjusting the section contents as |
| 483 | necessary, and (if using Rela relocs and generating a relocateable |
| 484 | output file) adjusting the reloc addend as necessary. |
| 485 | |
| 486 | This function does not have to worry about setting the reloc |
| 487 | address or the reloc symbol index. |
| 488 | |
| 489 | LOCAL_SYMS is a pointer to the swapped in local symbols. |
| 490 | |
| 491 | LOCAL_SECTIONS is an array giving the section in the input file |
| 492 | corresponding to the st_shndx field of each local symbol. |
| 493 | |
| 494 | The global hash table entry for the global symbols can be found |
| 495 | via elf_sym_hashes (input_bfd). |
| 496 | |
| 497 | When generating relocateable output, this function must handle |
| 498 | STB_LOCAL/STT_SECTION symbols specially. The output symbol is |
| 499 | going to be the section symbol corresponding to the output |
| 500 | section, which means that the addend must be adjusted |
| 501 | accordingly. */ |
| 502 | |
| 503 | static boolean |
| 504 | fr30_elf_relocate_section (output_bfd, info, input_bfd, input_section, |
| 505 | contents, relocs, local_syms, local_sections) |
| 506 | bfd * output_bfd; |
| 507 | struct bfd_link_info * info; |
| 508 | bfd * input_bfd; |
| 509 | asection * input_section; |
| 510 | bfd_byte * contents; |
| 511 | Elf_Internal_Rela * relocs; |
| 512 | Elf_Internal_Sym * local_syms; |
| 513 | asection ** local_sections; |
| 514 | { |
| 515 | Elf_Internal_Shdr * symtab_hdr; |
| 516 | struct elf_link_hash_entry ** sym_hashes; |
| 517 | Elf_Internal_Rela * rel; |
| 518 | Elf_Internal_Rela * relend; |
| 519 | |
| 520 | symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; |
| 521 | sym_hashes = elf_sym_hashes (input_bfd); |
| 522 | relend = relocs + input_section->reloc_count; |
| 523 | |
| 524 | for (rel = relocs; rel < relend; rel ++) |
| 525 | { |
| 526 | reloc_howto_type * howto; |
| 527 | unsigned long r_symndx; |
| 528 | Elf_Internal_Sym * sym; |
| 529 | asection * sec; |
| 530 | struct elf_link_hash_entry * h; |
| 531 | bfd_vma relocation; |
| 532 | bfd_reloc_status_type r; |
| 533 | const char * name = NULL; |
| 534 | int r_type; |
| 535 | |
| 536 | r_type = ELF32_R_TYPE (rel->r_info); |
| 537 | |
| 538 | if ( r_type == R_FR30_GNU_VTINHERIT |
| 539 | || r_type == R_FR30_GNU_VTENTRY) |
| 540 | continue; |
| 541 | |
| 542 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 543 | |
| 544 | if (info->relocateable) |
| 545 | { |
| 546 | /* This is a relocateable link. We don't have to change |
| 547 | anything, unless the reloc is against a section symbol, |
| 548 | in which case we have to adjust according to where the |
| 549 | section symbol winds up in the output section. */ |
| 550 | if (r_symndx < symtab_hdr->sh_info) |
| 551 | { |
| 552 | sym = local_syms + r_symndx; |
| 553 | |
| 554 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) |
| 555 | { |
| 556 | sec = local_sections [r_symndx]; |
| 557 | rel->r_addend += sec->output_offset + sym->st_value; |
| 558 | } |
| 559 | } |
| 560 | |
| 561 | continue; |
| 562 | } |
| 563 | |
| 564 | /* This is a final link. */ |
| 565 | howto = fr30_elf_howto_table + ELF32_R_TYPE (rel->r_info); |
| 566 | h = NULL; |
| 567 | sym = NULL; |
| 568 | sec = NULL; |
| 569 | |
| 570 | if (r_symndx < symtab_hdr->sh_info) |
| 571 | { |
| 572 | sym = local_syms + r_symndx; |
| 573 | sec = local_sections [r_symndx]; |
| 574 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel); |
| 575 | |
| 576 | name = bfd_elf_string_from_elf_section |
| 577 | (input_bfd, symtab_hdr->sh_link, sym->st_name); |
| 578 | name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name; |
| 579 | #if 0 |
| 580 | fprintf (stderr, "local: sec: %s, sym: %s (%d), value: %x + %x + %x addend %x\n", |
| 581 | sec->name, name, sym->st_name, |
| 582 | sec->output_section->vma, sec->output_offset, |
| 583 | sym->st_value, rel->r_addend); |
| 584 | #endif |
| 585 | } |
| 586 | else |
| 587 | { |
| 588 | h = sym_hashes [r_symndx - symtab_hdr->sh_info]; |
| 589 | |
| 590 | while (h->root.type == bfd_link_hash_indirect |
| 591 | || h->root.type == bfd_link_hash_warning) |
| 592 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 593 | |
| 594 | name = h->root.root.string; |
| 595 | |
| 596 | if (h->root.type == bfd_link_hash_defined |
| 597 | || h->root.type == bfd_link_hash_defweak) |
| 598 | { |
| 599 | sec = h->root.u.def.section; |
| 600 | relocation = (h->root.u.def.value |
| 601 | + sec->output_section->vma |
| 602 | + sec->output_offset); |
| 603 | #if 0 |
| 604 | fprintf (stderr, |
| 605 | "defined: sec: %s, name: %s, value: %x + %x + %x gives: %x\n", |
| 606 | sec->name, name, h->root.u.def.value, |
| 607 | sec->output_section->vma, sec->output_offset, relocation); |
| 608 | #endif |
| 609 | } |
| 610 | else if (h->root.type == bfd_link_hash_undefweak) |
| 611 | { |
| 612 | #if 0 |
| 613 | fprintf (stderr, "undefined: sec: %s, name: %s\n", |
| 614 | sec->name, name); |
| 615 | #endif |
| 616 | relocation = 0; |
| 617 | } |
| 618 | else |
| 619 | { |
| 620 | if (! ((*info->callbacks->undefined_symbol) |
| 621 | (info, h->root.root.string, input_bfd, |
| 622 | input_section, rel->r_offset, true))) |
| 623 | return false; |
| 624 | #if 0 |
| 625 | fprintf (stderr, "unknown: name: %s\n", name); |
| 626 | #endif |
| 627 | relocation = 0; |
| 628 | } |
| 629 | } |
| 630 | |
| 631 | r = fr30_final_link_relocate (howto, input_bfd, input_section, |
| 632 | contents, rel, relocation); |
| 633 | |
| 634 | if (r != bfd_reloc_ok) |
| 635 | { |
| 636 | const char * msg = (const char *) NULL; |
| 637 | |
| 638 | switch (r) |
| 639 | { |
| 640 | case bfd_reloc_overflow: |
| 641 | r = info->callbacks->reloc_overflow |
| 642 | (info, name, howto->name, (bfd_vma) 0, |
| 643 | input_bfd, input_section, rel->r_offset); |
| 644 | break; |
| 645 | |
| 646 | case bfd_reloc_undefined: |
| 647 | r = info->callbacks->undefined_symbol |
| 648 | (info, name, input_bfd, input_section, rel->r_offset, |
| 649 | true); |
| 650 | break; |
| 651 | |
| 652 | case bfd_reloc_outofrange: |
| 653 | msg = _("internal error: out of range error"); |
| 654 | break; |
| 655 | |
| 656 | case bfd_reloc_notsupported: |
| 657 | msg = _("internal error: unsupported relocation error"); |
| 658 | break; |
| 659 | |
| 660 | case bfd_reloc_dangerous: |
| 661 | msg = _("internal error: dangerous relocation"); |
| 662 | break; |
| 663 | |
| 664 | default: |
| 665 | msg = _("internal error: unknown error"); |
| 666 | break; |
| 667 | } |
| 668 | |
| 669 | if (msg) |
| 670 | r = info->callbacks->warning |
| 671 | (info, msg, name, input_bfd, input_section, rel->r_offset); |
| 672 | |
| 673 | if (! r) |
| 674 | return false; |
| 675 | } |
| 676 | } |
| 677 | |
| 678 | return true; |
| 679 | } |
| 680 | \f |
| 681 | /* Return the section that should be marked against GC for a given |
| 682 | relocation. */ |
| 683 | |
| 684 | static asection * |
| 685 | fr30_elf_gc_mark_hook (abfd, info, rel, h, sym) |
| 686 | bfd * abfd; |
| 687 | struct bfd_link_info * info ATTRIBUTE_UNUSED; |
| 688 | Elf_Internal_Rela * rel; |
| 689 | struct elf_link_hash_entry * h; |
| 690 | Elf_Internal_Sym * sym; |
| 691 | { |
| 692 | if (h != NULL) |
| 693 | { |
| 694 | switch (ELF32_R_TYPE (rel->r_info)) |
| 695 | { |
| 696 | case R_FR30_GNU_VTINHERIT: |
| 697 | case R_FR30_GNU_VTENTRY: |
| 698 | break; |
| 699 | |
| 700 | default: |
| 701 | switch (h->root.type) |
| 702 | { |
| 703 | case bfd_link_hash_defined: |
| 704 | case bfd_link_hash_defweak: |
| 705 | return h->root.u.def.section; |
| 706 | |
| 707 | case bfd_link_hash_common: |
| 708 | return h->root.u.c.p->section; |
| 709 | |
| 710 | default: |
| 711 | break; |
| 712 | } |
| 713 | } |
| 714 | } |
| 715 | else |
| 716 | { |
| 717 | if (!(elf_bad_symtab (abfd) |
| 718 | && ELF_ST_BIND (sym->st_info) != STB_LOCAL) |
| 719 | && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE) |
| 720 | && sym->st_shndx != SHN_COMMON)) |
| 721 | { |
| 722 | return bfd_section_from_elf_index (abfd, sym->st_shndx); |
| 723 | } |
| 724 | } |
| 725 | |
| 726 | return NULL; |
| 727 | } |
| 728 | |
| 729 | /* Update the got entry reference counts for the section being removed. */ |
| 730 | |
| 731 | static boolean |
| 732 | fr30_elf_gc_sweep_hook (abfd, info, sec, relocs) |
| 733 | bfd * abfd ATTRIBUTE_UNUSED; |
| 734 | struct bfd_link_info * info ATTRIBUTE_UNUSED; |
| 735 | asection * sec ATTRIBUTE_UNUSED; |
| 736 | const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED; |
| 737 | { |
| 738 | return true; |
| 739 | } |
| 740 | |
| 741 | /* Look through the relocs for a section during the first phase. |
| 742 | Since we don't do .gots or .plts, we just need to consider the |
| 743 | virtual table relocs for gc. */ |
| 744 | |
| 745 | static boolean |
| 746 | fr30_elf_check_relocs (abfd, info, sec, relocs) |
| 747 | bfd *abfd; |
| 748 | struct bfd_link_info *info; |
| 749 | asection *sec; |
| 750 | const Elf_Internal_Rela *relocs; |
| 751 | { |
| 752 | Elf_Internal_Shdr *symtab_hdr; |
| 753 | struct elf_link_hash_entry **sym_hashes, **sym_hashes_end; |
| 754 | const Elf_Internal_Rela *rel; |
| 755 | const Elf_Internal_Rela *rel_end; |
| 756 | |
| 757 | if (info->relocateable) |
| 758 | return true; |
| 759 | |
| 760 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 761 | sym_hashes = elf_sym_hashes (abfd); |
| 762 | sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof (Elf32_External_Sym); |
| 763 | if (!elf_bad_symtab (abfd)) |
| 764 | sym_hashes_end -= symtab_hdr->sh_info; |
| 765 | |
| 766 | rel_end = relocs + sec->reloc_count; |
| 767 | for (rel = relocs; rel < rel_end; rel++) |
| 768 | { |
| 769 | struct elf_link_hash_entry *h; |
| 770 | unsigned long r_symndx; |
| 771 | |
| 772 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 773 | if (r_symndx < symtab_hdr->sh_info) |
| 774 | h = NULL; |
| 775 | else |
| 776 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 777 | |
| 778 | switch (ELF32_R_TYPE (rel->r_info)) |
| 779 | { |
| 780 | /* This relocation describes the C++ object vtable hierarchy. |
| 781 | Reconstruct it for later use during GC. */ |
| 782 | case R_FR30_GNU_VTINHERIT: |
| 783 | if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) |
| 784 | return false; |
| 785 | break; |
| 786 | |
| 787 | /* This relocation describes which C++ vtable entries are actually |
| 788 | used. Record for later use during GC. */ |
| 789 | case R_FR30_GNU_VTENTRY: |
| 790 | if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend)) |
| 791 | return false; |
| 792 | break; |
| 793 | } |
| 794 | } |
| 795 | |
| 796 | return true; |
| 797 | } |
| 798 | \f |
| 799 | #define ELF_ARCH bfd_arch_fr30 |
| 800 | #define ELF_MACHINE_CODE EM_FR30 |
| 801 | #define ELF_MACHINE_ALT1 EM_CYGNUS_FR30 |
| 802 | #define ELF_MAXPAGESIZE 0x1000 |
| 803 | |
| 804 | #define TARGET_BIG_SYM bfd_elf32_fr30_vec |
| 805 | #define TARGET_BIG_NAME "elf32-fr30" |
| 806 | |
| 807 | #define elf_info_to_howto_rel NULL |
| 808 | #define elf_info_to_howto fr30_info_to_howto_rela |
| 809 | #define elf_backend_relocate_section fr30_elf_relocate_section |
| 810 | #define elf_backend_gc_mark_hook fr30_elf_gc_mark_hook |
| 811 | #define elf_backend_gc_sweep_hook fr30_elf_gc_sweep_hook |
| 812 | #define elf_backend_check_relocs fr30_elf_check_relocs |
| 813 | |
| 814 | #define elf_backend_can_gc_sections 1 |
| 815 | |
| 816 | #define bfd_elf32_bfd_reloc_type_lookup fr30_reloc_type_lookup |
| 817 | |
| 818 | #include "elf32-target.h" |