| 1 | /* CRIS-specific support for 32-bit ELF. |
| 2 | Copyright (C) 2000 Free Software Foundation, Inc. |
| 3 | Contributed by Axis Communications AB. |
| 4 | Written by Hans-Peter Nilsson, based on elf32-fr30.c |
| 5 | |
| 6 | This file is part of BFD, the Binary File Descriptor library. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 2 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 21 | |
| 22 | #include "bfd.h" |
| 23 | #include "sysdep.h" |
| 24 | #include "libbfd.h" |
| 25 | #include "elf-bfd.h" |
| 26 | #include "elf/cris.h" |
| 27 | |
| 28 | /* Forward declarations. */ |
| 29 | static reloc_howto_type * cris_reloc_type_lookup |
| 30 | PARAMS ((bfd *abfd, bfd_reloc_code_real_type code)); |
| 31 | |
| 32 | static void cris_info_to_howto_rela |
| 33 | PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *)); |
| 34 | |
| 35 | static boolean cris_elf_relocate_section |
| 36 | PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, |
| 37 | Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); |
| 38 | |
| 39 | static bfd_reloc_status_type cris_final_link_relocate |
| 40 | PARAMS ((reloc_howto_type *, bfd *, asection *, bfd_byte *, |
| 41 | Elf_Internal_Rela *, bfd_vma)); |
| 42 | |
| 43 | static boolean cris_elf_gc_sweep_hook |
| 44 | PARAMS ((bfd *, struct bfd_link_info *, asection *, |
| 45 | const Elf_Internal_Rela *)); |
| 46 | |
| 47 | static asection * cris_elf_gc_mark_hook |
| 48 | PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *, |
| 49 | struct elf_link_hash_entry *, Elf_Internal_Sym *)); |
| 50 | |
| 51 | static boolean cris_elf_object_p PARAMS ((bfd *)); |
| 52 | |
| 53 | static void cris_elf_final_write_processing PARAMS ((bfd *, boolean)); |
| 54 | |
| 55 | static boolean cris_elf_print_private_bfd_data PARAMS ((bfd *, PTR)); |
| 56 | |
| 57 | static boolean cris_elf_merge_private_bfd_data PARAMS ((bfd *, bfd *)); |
| 58 | |
| 59 | static reloc_howto_type cris_elf_howto_table [] = |
| 60 | { |
| 61 | /* This reloc does nothing. */ |
| 62 | HOWTO (R_CRIS_NONE, /* type */ |
| 63 | 0, /* rightshift */ |
| 64 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 65 | 32, /* bitsize */ |
| 66 | false, /* pc_relative */ |
| 67 | 0, /* bitpos */ |
| 68 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 69 | bfd_elf_generic_reloc, /* special_function */ |
| 70 | "R_CRIS_NONE", /* name */ |
| 71 | false, /* partial_inplace */ |
| 72 | 0, /* src_mask */ |
| 73 | 0, /* dst_mask */ |
| 74 | false), /* pcrel_offset */ |
| 75 | |
| 76 | /* An 8 bit absolute relocation. */ |
| 77 | HOWTO (R_CRIS_8, /* type */ |
| 78 | 0, /* rightshift */ |
| 79 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 80 | 8, /* bitsize */ |
| 81 | false, /* pc_relative */ |
| 82 | 0, /* bitpos */ |
| 83 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 84 | bfd_elf_generic_reloc, /* special_function */ |
| 85 | "R_CRIS_8", /* name */ |
| 86 | false, /* partial_inplace */ |
| 87 | 0x0000, /* src_mask */ |
| 88 | 0x00ff, /* dst_mask */ |
| 89 | false), /* pcrel_offset */ |
| 90 | |
| 91 | /* A 16 bit absolute relocation. */ |
| 92 | HOWTO (R_CRIS_16, /* type */ |
| 93 | 0, /* rightshift */ |
| 94 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 95 | 16, /* bitsize */ |
| 96 | false, /* pc_relative */ |
| 97 | 0, /* bitpos */ |
| 98 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 99 | bfd_elf_generic_reloc, /* special_function */ |
| 100 | "R_CRIS_16", /* name */ |
| 101 | false, /* partial_inplace */ |
| 102 | 0x00000000, /* src_mask */ |
| 103 | 0x0000ffff, /* dst_mask */ |
| 104 | false), /* pcrel_offset */ |
| 105 | |
| 106 | /* A 32 bit absolute relocation. */ |
| 107 | HOWTO (R_CRIS_32, /* type */ |
| 108 | 0, /* rightshift */ |
| 109 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 110 | 32, /* bitsize */ |
| 111 | false, /* pc_relative */ |
| 112 | 0, /* bitpos */ |
| 113 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 114 | bfd_elf_generic_reloc, /* special_function */ |
| 115 | "R_CRIS_32", /* name */ |
| 116 | false, /* partial_inplace */ |
| 117 | 0x00000000, /* src_mask */ |
| 118 | 0xffffffff, /* dst_mask */ |
| 119 | false), /* pcrel_offset */ |
| 120 | |
| 121 | /* An 8 bit absolute relocation. */ |
| 122 | HOWTO (R_CRIS_8_PCREL, /* type */ |
| 123 | 0, /* rightshift */ |
| 124 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 125 | 8, /* bitsize */ |
| 126 | true, /* pc_relative */ |
| 127 | 0, /* bitpos */ |
| 128 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 129 | bfd_elf_generic_reloc, /* special_function */ |
| 130 | "R_CRIS_8_PCREL", /* name */ |
| 131 | false, /* partial_inplace */ |
| 132 | 0x0000, /* src_mask */ |
| 133 | 0x00ff, /* dst_mask */ |
| 134 | false), /* pcrel_offset */ |
| 135 | |
| 136 | /* A 16 bit absolute relocation. */ |
| 137 | HOWTO (R_CRIS_16_PCREL, /* type */ |
| 138 | 0, /* rightshift */ |
| 139 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 140 | 16, /* bitsize */ |
| 141 | true, /* pc_relative */ |
| 142 | 0, /* bitpos */ |
| 143 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 144 | bfd_elf_generic_reloc, /* special_function */ |
| 145 | "R_CRIS_16", /* name */ |
| 146 | false, /* partial_inplace */ |
| 147 | 0x00000000, /* src_mask */ |
| 148 | 0x0000ffff, /* dst_mask */ |
| 149 | false), /* pcrel_offset */ |
| 150 | |
| 151 | /* A 32 bit absolute relocation. */ |
| 152 | HOWTO (R_CRIS_32_PCREL, /* type */ |
| 153 | 0, /* rightshift */ |
| 154 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 155 | 32, /* bitsize */ |
| 156 | true, /* pc_relative */ |
| 157 | 0, /* bitpos */ |
| 158 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 159 | bfd_elf_generic_reloc, /* special_function */ |
| 160 | "R_CRIS_32", /* name */ |
| 161 | false, /* partial_inplace */ |
| 162 | 0x00000000, /* src_mask */ |
| 163 | 0xffffffff, /* dst_mask */ |
| 164 | false), /* pcrel_offset */ |
| 165 | |
| 166 | /* GNU extension to record C++ vtable hierarchy */ |
| 167 | HOWTO (R_CRIS_GNU_VTINHERIT, /* type */ |
| 168 | 0, /* rightshift */ |
| 169 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 170 | 0, /* bitsize */ |
| 171 | false, /* pc_relative */ |
| 172 | 0, /* bitpos */ |
| 173 | complain_overflow_dont, /* complain_on_overflow */ |
| 174 | NULL, /* special_function */ |
| 175 | "R_CRIS_GNU_VTINHERIT", /* name */ |
| 176 | false, /* partial_inplace */ |
| 177 | 0, /* src_mask */ |
| 178 | 0, /* dst_mask */ |
| 179 | false), /* pcrel_offset */ |
| 180 | |
| 181 | /* GNU extension to record C++ vtable member usage */ |
| 182 | HOWTO (R_CRIS_GNU_VTENTRY, /* type */ |
| 183 | 0, /* rightshift */ |
| 184 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 185 | 0, /* bitsize */ |
| 186 | false, /* pc_relative */ |
| 187 | 0, /* bitpos */ |
| 188 | complain_overflow_dont, /* complain_on_overflow */ |
| 189 | _bfd_elf_rel_vtable_reloc_fn, /* special_function */ |
| 190 | "R_CRIS_GNU_VTENTRY", /* name */ |
| 191 | false, /* partial_inplace */ |
| 192 | 0, /* src_mask */ |
| 193 | 0, /* dst_mask */ |
| 194 | false) /* pcrel_offset */ |
| 195 | }; |
| 196 | \f |
| 197 | /* Map BFD reloc types to CRIS ELF reloc types. */ |
| 198 | |
| 199 | struct cris_reloc_map |
| 200 | { |
| 201 | bfd_reloc_code_real_type bfd_reloc_val; |
| 202 | unsigned int cris_reloc_val; |
| 203 | }; |
| 204 | |
| 205 | static const struct cris_reloc_map cris_reloc_map [] = |
| 206 | { |
| 207 | { BFD_RELOC_NONE, R_CRIS_NONE }, |
| 208 | { BFD_RELOC_8, R_CRIS_8 }, |
| 209 | { BFD_RELOC_16, R_CRIS_16 }, |
| 210 | { BFD_RELOC_32, R_CRIS_32 }, |
| 211 | { BFD_RELOC_8_PCREL, R_CRIS_8_PCREL }, |
| 212 | { BFD_RELOC_16_PCREL, R_CRIS_16_PCREL }, |
| 213 | { BFD_RELOC_32_PCREL, R_CRIS_32_PCREL }, |
| 214 | { BFD_RELOC_VTABLE_INHERIT, R_CRIS_GNU_VTINHERIT }, |
| 215 | { BFD_RELOC_VTABLE_ENTRY, R_CRIS_GNU_VTENTRY } |
| 216 | }; |
| 217 | |
| 218 | static reloc_howto_type * |
| 219 | cris_reloc_type_lookup (abfd, code) |
| 220 | bfd * abfd ATTRIBUTE_UNUSED; |
| 221 | bfd_reloc_code_real_type code; |
| 222 | { |
| 223 | unsigned int i; |
| 224 | |
| 225 | for (i = sizeof (cris_reloc_map) / sizeof (cris_reloc_map[0]); |
| 226 | --i;) |
| 227 | if (cris_reloc_map [i].bfd_reloc_val == code) |
| 228 | return & cris_elf_howto_table [cris_reloc_map[i].cris_reloc_val]; |
| 229 | |
| 230 | return NULL; |
| 231 | } |
| 232 | |
| 233 | /* Set the howto pointer for an CRIS ELF reloc. */ |
| 234 | |
| 235 | static void |
| 236 | cris_info_to_howto_rela (abfd, cache_ptr, dst) |
| 237 | bfd * abfd ATTRIBUTE_UNUSED; |
| 238 | arelent * cache_ptr; |
| 239 | Elf32_Internal_Rela * dst; |
| 240 | { |
| 241 | unsigned int r_type; |
| 242 | |
| 243 | r_type = ELF32_R_TYPE (dst->r_info); |
| 244 | BFD_ASSERT (r_type < (unsigned int) R_CRIS_max); |
| 245 | cache_ptr->howto = & cris_elf_howto_table [r_type]; |
| 246 | } |
| 247 | \f |
| 248 | /* Perform a single relocation. By default we use the standard BFD |
| 249 | routines, but we might have to do a few relocs ourselves in the future. */ |
| 250 | |
| 251 | static bfd_reloc_status_type |
| 252 | cris_final_link_relocate (howto, input_bfd, input_section, contents, rel, |
| 253 | relocation) |
| 254 | reloc_howto_type * howto; |
| 255 | bfd * input_bfd; |
| 256 | asection * input_section; |
| 257 | bfd_byte * contents; |
| 258 | Elf_Internal_Rela * rel; |
| 259 | bfd_vma relocation; |
| 260 | { |
| 261 | bfd_reloc_status_type r |
| 262 | = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 263 | contents, rel->r_offset, |
| 264 | relocation, rel->r_addend); |
| 265 | return r; |
| 266 | } |
| 267 | \f |
| 268 | /* Relocate an CRIS ELF section. See elf32-fr30.c, from where this was |
| 269 | copied, for further comments. */ |
| 270 | |
| 271 | static boolean |
| 272 | cris_elf_relocate_section (output_bfd, info, input_bfd, input_section, |
| 273 | contents, relocs, local_syms, local_sections) |
| 274 | bfd * output_bfd ATTRIBUTE_UNUSED; |
| 275 | struct bfd_link_info * info; |
| 276 | bfd * input_bfd; |
| 277 | asection * input_section; |
| 278 | bfd_byte * contents; |
| 279 | Elf_Internal_Rela * relocs; |
| 280 | Elf_Internal_Sym * local_syms; |
| 281 | asection ** local_sections; |
| 282 | { |
| 283 | Elf_Internal_Shdr * symtab_hdr; |
| 284 | struct elf_link_hash_entry ** sym_hashes; |
| 285 | Elf_Internal_Rela * rel; |
| 286 | Elf_Internal_Rela * relend; |
| 287 | |
| 288 | symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; |
| 289 | sym_hashes = elf_sym_hashes (input_bfd); |
| 290 | relend = relocs + input_section->reloc_count; |
| 291 | |
| 292 | /* It seems this can happen with erroneous or unsupported input (mixing |
| 293 | a.out and elf in an archive, for example.) */ |
| 294 | if (sym_hashes == NULL) |
| 295 | return false; |
| 296 | |
| 297 | for (rel = relocs; rel < relend; rel ++) |
| 298 | { |
| 299 | reloc_howto_type * howto; |
| 300 | unsigned long r_symndx; |
| 301 | Elf_Internal_Sym * sym; |
| 302 | asection * sec; |
| 303 | struct elf_link_hash_entry * h; |
| 304 | bfd_vma relocation; |
| 305 | bfd_reloc_status_type r; |
| 306 | const char * name = NULL; |
| 307 | int r_type; |
| 308 | |
| 309 | r_type = ELF32_R_TYPE (rel->r_info); |
| 310 | |
| 311 | if ( r_type == R_CRIS_GNU_VTINHERIT |
| 312 | || r_type == R_CRIS_GNU_VTENTRY) |
| 313 | continue; |
| 314 | |
| 315 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 316 | |
| 317 | if (info->relocateable) |
| 318 | { |
| 319 | /* This is a relocateable link. We don't have to change |
| 320 | anything, unless the reloc is against a section symbol, |
| 321 | in which case we have to adjust according to where the |
| 322 | section symbol winds up in the output section. */ |
| 323 | if (r_symndx < symtab_hdr->sh_info) |
| 324 | { |
| 325 | sym = local_syms + r_symndx; |
| 326 | |
| 327 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) |
| 328 | { |
| 329 | sec = local_sections [r_symndx]; |
| 330 | rel->r_addend += sec->output_offset + sym->st_value; |
| 331 | } |
| 332 | } |
| 333 | |
| 334 | continue; |
| 335 | } |
| 336 | |
| 337 | /* This is a final link. */ |
| 338 | howto = cris_elf_howto_table + ELF32_R_TYPE (rel->r_info); |
| 339 | h = NULL; |
| 340 | sym = NULL; |
| 341 | sec = NULL; |
| 342 | |
| 343 | if (r_symndx < symtab_hdr->sh_info) |
| 344 | { |
| 345 | sym = local_syms + r_symndx; |
| 346 | sec = local_sections [r_symndx]; |
| 347 | relocation = (sec->output_section->vma |
| 348 | + sec->output_offset |
| 349 | + sym->st_value); |
| 350 | |
| 351 | name = bfd_elf_string_from_elf_section |
| 352 | (input_bfd, symtab_hdr->sh_link, sym->st_name); |
| 353 | name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name; |
| 354 | #if 0 |
| 355 | fprintf (stderr, "local: sec: %s, sym: %s (%d), value: %x + %x + %x addend %x\n", |
| 356 | sec->name, name, sym->st_name, |
| 357 | sec->output_section->vma, sec->output_offset, |
| 358 | sym->st_value, rel->r_addend); |
| 359 | #endif |
| 360 | } |
| 361 | else |
| 362 | { |
| 363 | h = sym_hashes [r_symndx - symtab_hdr->sh_info]; |
| 364 | |
| 365 | while (h->root.type == bfd_link_hash_indirect |
| 366 | || h->root.type == bfd_link_hash_warning) |
| 367 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 368 | |
| 369 | name = h->root.root.string; |
| 370 | |
| 371 | if (h->root.type == bfd_link_hash_defined |
| 372 | || h->root.type == bfd_link_hash_defweak) |
| 373 | { |
| 374 | sec = h->root.u.def.section; |
| 375 | relocation = (h->root.u.def.value |
| 376 | + sec->output_section->vma |
| 377 | + sec->output_offset); |
| 378 | #if 0 |
| 379 | fprintf (stderr, |
| 380 | "defined: sec: %s, name: %s, value: %x + %x + %x gives: %x\n", |
| 381 | sec->name, name, h->root.u.def.value, |
| 382 | sec->output_section->vma, sec->output_offset, relocation); |
| 383 | #endif |
| 384 | } |
| 385 | else if (h->root.type == bfd_link_hash_undefweak) |
| 386 | { |
| 387 | #if 0 |
| 388 | fprintf (stderr, "undefined: sec: %s, name: %s\n", |
| 389 | sec->name, name); |
| 390 | #endif |
| 391 | relocation = 0; |
| 392 | } |
| 393 | else if (info->shared |
| 394 | && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) |
| 395 | relocation = 0; |
| 396 | else |
| 397 | { |
| 398 | if (! ((*info->callbacks->undefined_symbol) |
| 399 | (info, h->root.root.string, input_bfd, |
| 400 | input_section, rel->r_offset, true))) |
| 401 | return false; |
| 402 | #if 0 |
| 403 | fprintf (stderr, "unknown: name: %s\n", name); |
| 404 | #endif |
| 405 | relocation = 0; |
| 406 | } |
| 407 | } |
| 408 | |
| 409 | r = cris_final_link_relocate (howto, input_bfd, input_section, |
| 410 | contents, rel, relocation); |
| 411 | |
| 412 | if (r != bfd_reloc_ok) |
| 413 | { |
| 414 | const char * msg = (const char *) NULL; |
| 415 | |
| 416 | switch (r) |
| 417 | { |
| 418 | case bfd_reloc_overflow: |
| 419 | r = info->callbacks->reloc_overflow |
| 420 | (info, name, howto->name, (bfd_vma) 0, |
| 421 | input_bfd, input_section, rel->r_offset); |
| 422 | break; |
| 423 | |
| 424 | case bfd_reloc_undefined: |
| 425 | r = info->callbacks->undefined_symbol |
| 426 | (info, name, input_bfd, input_section, rel->r_offset, |
| 427 | true); |
| 428 | break; |
| 429 | |
| 430 | case bfd_reloc_outofrange: |
| 431 | msg = _("internal error: out of range error"); |
| 432 | break; |
| 433 | |
| 434 | case bfd_reloc_notsupported: |
| 435 | msg = _("internal error: unsupported relocation error"); |
| 436 | break; |
| 437 | |
| 438 | case bfd_reloc_dangerous: |
| 439 | msg = _("internal error: dangerous relocation"); |
| 440 | break; |
| 441 | |
| 442 | default: |
| 443 | msg = _("internal error: unknown error"); |
| 444 | break; |
| 445 | } |
| 446 | |
| 447 | if (msg) |
| 448 | r = info->callbacks->warning |
| 449 | (info, msg, name, input_bfd, input_section, rel->r_offset); |
| 450 | |
| 451 | if (! r) |
| 452 | return false; |
| 453 | } |
| 454 | } |
| 455 | |
| 456 | return true; |
| 457 | } |
| 458 | \f |
| 459 | /* Return the section that should be marked against GC for a given |
| 460 | relocation. */ |
| 461 | |
| 462 | static asection * |
| 463 | cris_elf_gc_mark_hook (abfd, info, rel, h, sym) |
| 464 | bfd * abfd; |
| 465 | struct bfd_link_info * info ATTRIBUTE_UNUSED; |
| 466 | Elf_Internal_Rela * rel; |
| 467 | struct elf_link_hash_entry * h; |
| 468 | Elf_Internal_Sym * sym; |
| 469 | { |
| 470 | if (h != NULL) |
| 471 | { |
| 472 | switch (ELF32_R_TYPE (rel->r_info)) |
| 473 | { |
| 474 | case R_CRIS_GNU_VTINHERIT: |
| 475 | case R_CRIS_GNU_VTENTRY: |
| 476 | break; |
| 477 | |
| 478 | default: |
| 479 | switch (h->root.type) |
| 480 | { |
| 481 | case bfd_link_hash_defined: |
| 482 | case bfd_link_hash_defweak: |
| 483 | return h->root.u.def.section; |
| 484 | |
| 485 | case bfd_link_hash_common: |
| 486 | return h->root.u.c.p->section; |
| 487 | |
| 488 | default: |
| 489 | break; |
| 490 | } |
| 491 | } |
| 492 | } |
| 493 | else |
| 494 | { |
| 495 | if (!(elf_bad_symtab (abfd) |
| 496 | && ELF_ST_BIND (sym->st_info) != STB_LOCAL) |
| 497 | && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE) |
| 498 | && sym->st_shndx != SHN_COMMON)) |
| 499 | { |
| 500 | return bfd_section_from_elf_index (abfd, sym->st_shndx); |
| 501 | } |
| 502 | } |
| 503 | |
| 504 | return NULL; |
| 505 | } |
| 506 | |
| 507 | /* Update the got entry reference counts for the section being removed. */ |
| 508 | |
| 509 | static boolean |
| 510 | cris_elf_gc_sweep_hook (abfd, info, sec, relocs) |
| 511 | bfd * abfd ATTRIBUTE_UNUSED; |
| 512 | struct bfd_link_info * info ATTRIBUTE_UNUSED; |
| 513 | asection * sec ATTRIBUTE_UNUSED; |
| 514 | const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED; |
| 515 | { |
| 516 | return true; |
| 517 | } |
| 518 | |
| 519 | /* Look through the relocs for a section during the first phase. |
| 520 | Since we don't do .gots or .plts, we just need to consider the |
| 521 | virtual table relocs for gc. */ |
| 522 | |
| 523 | static boolean |
| 524 | cris_elf_check_relocs (abfd, info, sec, relocs) |
| 525 | bfd *abfd; |
| 526 | struct bfd_link_info *info; |
| 527 | asection *sec; |
| 528 | const Elf_Internal_Rela *relocs; |
| 529 | { |
| 530 | Elf_Internal_Shdr *symtab_hdr; |
| 531 | struct elf_link_hash_entry **sym_hashes, **sym_hashes_end; |
| 532 | const Elf_Internal_Rela *rel; |
| 533 | const Elf_Internal_Rela *rel_end; |
| 534 | |
| 535 | if (info->relocateable) |
| 536 | return true; |
| 537 | |
| 538 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 539 | sym_hashes = elf_sym_hashes (abfd); |
| 540 | sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof (Elf32_External_Sym); |
| 541 | if (!elf_bad_symtab (abfd)) |
| 542 | sym_hashes_end -= symtab_hdr->sh_info; |
| 543 | |
| 544 | rel_end = relocs + sec->reloc_count; |
| 545 | for (rel = relocs; rel < rel_end; rel++) |
| 546 | { |
| 547 | struct elf_link_hash_entry *h; |
| 548 | unsigned long r_symndx; |
| 549 | |
| 550 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 551 | if (r_symndx < symtab_hdr->sh_info) |
| 552 | h = NULL; |
| 553 | else |
| 554 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 555 | |
| 556 | switch (ELF32_R_TYPE (rel->r_info)) |
| 557 | { |
| 558 | /* This relocation describes the C++ object vtable hierarchy. |
| 559 | Reconstruct it for later use during GC. */ |
| 560 | case R_CRIS_GNU_VTINHERIT: |
| 561 | if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) |
| 562 | return false; |
| 563 | break; |
| 564 | |
| 565 | /* This relocation describes which C++ vtable entries are actually |
| 566 | used. Record for later use during GC. */ |
| 567 | case R_CRIS_GNU_VTENTRY: |
| 568 | if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend)) |
| 569 | return false; |
| 570 | break; |
| 571 | } |
| 572 | } |
| 573 | |
| 574 | return true; |
| 575 | } |
| 576 | |
| 577 | /* Reject a file depending on underscores on symbols. */ |
| 578 | |
| 579 | static boolean |
| 580 | cris_elf_object_p (abfd) |
| 581 | bfd *abfd; |
| 582 | { |
| 583 | if ((elf_elfheader (abfd)->e_flags & EF_CRIS_UNDERSCORE)) |
| 584 | return (bfd_get_symbol_leading_char (abfd) == '_'); |
| 585 | else |
| 586 | return (bfd_get_symbol_leading_char (abfd) == 0); |
| 587 | } |
| 588 | |
| 589 | /* Mark presence or absence of leading underscore. */ |
| 590 | |
| 591 | static void |
| 592 | cris_elf_final_write_processing (abfd, linker) |
| 593 | bfd *abfd; |
| 594 | boolean linker ATTRIBUTE_UNUSED; |
| 595 | { |
| 596 | if (bfd_get_symbol_leading_char (abfd) == '_') |
| 597 | elf_elfheader (abfd)->e_flags |= EF_CRIS_UNDERSCORE; |
| 598 | else |
| 599 | elf_elfheader (abfd)->e_flags &= ~EF_CRIS_UNDERSCORE; |
| 600 | } |
| 601 | |
| 602 | /* Display the flags field. */ |
| 603 | |
| 604 | static boolean |
| 605 | cris_elf_print_private_bfd_data (abfd, ptr) |
| 606 | bfd *abfd; |
| 607 | PTR ptr; |
| 608 | { |
| 609 | FILE *file = (FILE *) ptr; |
| 610 | |
| 611 | BFD_ASSERT (abfd != NULL && ptr != NULL) |
| 612 | |
| 613 | _bfd_elf_print_private_bfd_data (abfd, ptr); |
| 614 | |
| 615 | fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); |
| 616 | |
| 617 | if (elf_elfheader (abfd)->e_flags & EF_CRIS_UNDERSCORE) |
| 618 | fprintf (file, _(" [symbols have a _ prefix]")); |
| 619 | |
| 620 | fputc ('\n', file); |
| 621 | return true; |
| 622 | } |
| 623 | |
| 624 | /* Don't mix files with and without a leading underscore. */ |
| 625 | |
| 626 | static boolean |
| 627 | cris_elf_merge_private_bfd_data (ibfd, obfd) |
| 628 | bfd *ibfd; |
| 629 | bfd *obfd; |
| 630 | { |
| 631 | flagword old_flags, new_flags; |
| 632 | |
| 633 | if (_bfd_generic_verify_endian_match (ibfd, obfd) == false) |
| 634 | return false; |
| 635 | |
| 636 | if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour |
| 637 | || bfd_get_flavour (obfd) != bfd_target_elf_flavour) |
| 638 | return true; |
| 639 | |
| 640 | if (! elf_flags_init (obfd)) |
| 641 | { |
| 642 | /* This happens when ld starts out with a 'blank' output file. */ |
| 643 | elf_flags_init (obfd) = true; |
| 644 | |
| 645 | /* Set flags according to current bfd_target. */ |
| 646 | cris_elf_final_write_processing (obfd, false); |
| 647 | } |
| 648 | |
| 649 | old_flags = elf_elfheader (obfd)->e_flags; |
| 650 | new_flags = elf_elfheader (ibfd)->e_flags; |
| 651 | |
| 652 | /* Is this good or bad? We'll follow with other excluding flags. */ |
| 653 | if ((old_flags & EF_CRIS_UNDERSCORE) != (new_flags & EF_CRIS_UNDERSCORE)) |
| 654 | { |
| 655 | (*_bfd_error_handler) |
| 656 | ((new_flags & EF_CRIS_UNDERSCORE) |
| 657 | ? _("%s: uses _-prefixed symbols, but writing file with non-prefixed symbols") |
| 658 | : _("%s: uses non-prefixed symbols, but writing file with _-prefixed symbols"), |
| 659 | bfd_get_filename (ibfd)); |
| 660 | bfd_set_error (bfd_error_bad_value); |
| 661 | return false; |
| 662 | } |
| 663 | |
| 664 | return true; |
| 665 | } |
| 666 | \f |
| 667 | #define ELF_ARCH bfd_arch_cris |
| 668 | #define ELF_MACHINE_CODE EM_CRIS |
| 669 | #define ELF_MAXPAGESIZE 0x2000 |
| 670 | |
| 671 | #define TARGET_LITTLE_SYM bfd_elf32_cris_vec |
| 672 | #define TARGET_LITTLE_NAME "elf32-cris" |
| 673 | #define elf_symbol_leading_char 0 |
| 674 | |
| 675 | #define elf_info_to_howto_rel NULL |
| 676 | #define elf_info_to_howto cris_info_to_howto_rela |
| 677 | #define elf_backend_relocate_section cris_elf_relocate_section |
| 678 | #define elf_backend_gc_mark_hook cris_elf_gc_mark_hook |
| 679 | #define elf_backend_gc_sweep_hook cris_elf_gc_sweep_hook |
| 680 | #define elf_backend_check_relocs cris_elf_check_relocs |
| 681 | |
| 682 | #define elf_backend_can_gc_sections 1 |
| 683 | |
| 684 | #define elf_backend_object_p cris_elf_object_p |
| 685 | #define elf_backend_final_write_processing \ |
| 686 | cris_elf_final_write_processing |
| 687 | #define bfd_elf32_bfd_print_private_bfd_data \ |
| 688 | cris_elf_print_private_bfd_data |
| 689 | #define bfd_elf32_bfd_merge_private_bfd_data \ |
| 690 | cris_elf_merge_private_bfd_data |
| 691 | |
| 692 | #define bfd_elf32_bfd_reloc_type_lookup cris_reloc_type_lookup |
| 693 | |
| 694 | /* Later, we my want to optimize RELA entries into REL entries for dynamic |
| 695 | linking and libraries (if it's a win of any significance). Until then, |
| 696 | take the easy route. */ |
| 697 | #define elf_backend_may_use_rel_p 0 |
| 698 | #define elf_backend_may_use_rela_p 1 |
| 699 | |
| 700 | #include "elf32-target.h" |
| 701 | |
| 702 | #define INCLUDED_TARGET_FILE |
| 703 | |
| 704 | #undef TARGET_LITTLE_SYM |
| 705 | #undef TARGET_LITTLE_NAME |
| 706 | #undef elf_symbol_leading_char |
| 707 | |
| 708 | #define TARGET_LITTLE_SYM bfd_elf32_us_cris_vec |
| 709 | #define TARGET_LITTLE_NAME "elf32-us-cris" |
| 710 | #define elf_symbol_leading_char '_' |
| 711 | |
| 712 | #include "elf32-target.h" |