| 1 | /* Motorola MCore specific support for 32-bit ELF |
| 2 | Copyright (C) 1994-2019 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 3 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., 51 Franklin Street - Fifth Floor, Boston, |
| 19 | MA 02110-1301, USA. */ |
| 20 | |
| 21 | |
| 22 | /* This file is based on a preliminary RCE ELF ABI. The |
| 23 | information may not match the final RCE ELF ABI. */ |
| 24 | |
| 25 | #include "sysdep.h" |
| 26 | #include "bfd.h" |
| 27 | #include "bfdlink.h" |
| 28 | #include "libbfd.h" |
| 29 | #include "elf-bfd.h" |
| 30 | #include "elf/mcore.h" |
| 31 | #include <assert.h> |
| 32 | |
| 33 | /* RELA relocs are used here... */ |
| 34 | |
| 35 | /* Function to set whether a module needs the -mrelocatable bit set. */ |
| 36 | |
| 37 | static bfd_boolean |
| 38 | mcore_elf_set_private_flags (bfd * abfd, flagword flags) |
| 39 | { |
| 40 | BFD_ASSERT (! elf_flags_init (abfd) |
| 41 | || elf_elfheader (abfd)->e_flags == flags); |
| 42 | |
| 43 | elf_elfheader (abfd)->e_flags = flags; |
| 44 | elf_flags_init (abfd) = TRUE; |
| 45 | return TRUE; |
| 46 | } |
| 47 | |
| 48 | /* Merge backend specific data from an object file to the output |
| 49 | object file when linking. */ |
| 50 | |
| 51 | static bfd_boolean |
| 52 | mcore_elf_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info) |
| 53 | { |
| 54 | bfd *obfd = info->output_bfd; |
| 55 | flagword old_flags; |
| 56 | flagword new_flags; |
| 57 | |
| 58 | /* Check if we have the same endianness. */ |
| 59 | if (! _bfd_generic_verify_endian_match (ibfd, info)) |
| 60 | return FALSE; |
| 61 | |
| 62 | if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour |
| 63 | || bfd_get_flavour (obfd) != bfd_target_elf_flavour) |
| 64 | return TRUE; |
| 65 | |
| 66 | new_flags = elf_elfheader (ibfd)->e_flags; |
| 67 | old_flags = elf_elfheader (obfd)->e_flags; |
| 68 | |
| 69 | if (! elf_flags_init (obfd)) |
| 70 | { |
| 71 | /* First call, no flags set. */ |
| 72 | elf_flags_init (obfd) = TRUE; |
| 73 | elf_elfheader (obfd)->e_flags = new_flags; |
| 74 | } |
| 75 | else if (new_flags == old_flags) |
| 76 | /* Compatible flags are OK. */ |
| 77 | ; |
| 78 | else |
| 79 | { |
| 80 | /* FIXME */ |
| 81 | } |
| 82 | |
| 83 | return TRUE; |
| 84 | } |
| 85 | \f |
| 86 | /* Don't pretend we can deal with unsupported relocs. */ |
| 87 | |
| 88 | static bfd_reloc_status_type |
| 89 | mcore_elf_unsupported_reloc (bfd * abfd, |
| 90 | arelent * reloc_entry, |
| 91 | asymbol * symbol ATTRIBUTE_UNUSED, |
| 92 | void * data ATTRIBUTE_UNUSED, |
| 93 | asection * input_section ATTRIBUTE_UNUSED, |
| 94 | bfd * output_bfd ATTRIBUTE_UNUSED, |
| 95 | char ** error_message ATTRIBUTE_UNUSED) |
| 96 | { |
| 97 | BFD_ASSERT (reloc_entry->howto != (reloc_howto_type *)0); |
| 98 | |
| 99 | /* xgettext:c-format */ |
| 100 | _bfd_error_handler (_("%pB: %s unsupported"), |
| 101 | abfd, |
| 102 | reloc_entry->howto->name); |
| 103 | |
| 104 | return bfd_reloc_notsupported; |
| 105 | } |
| 106 | |
| 107 | static reloc_howto_type * mcore_elf_howto_table [(int) R_MCORE_max]; |
| 108 | |
| 109 | static reloc_howto_type mcore_elf_howto_raw[] = |
| 110 | { |
| 111 | /* This reloc does nothing. */ |
| 112 | HOWTO (R_MCORE_NONE, /* type */ |
| 113 | 0, /* rightshift */ |
| 114 | 3, /* size (0 = byte, 1 = short, 2 = long) */ |
| 115 | 0, /* bitsize */ |
| 116 | FALSE, /* pc_relative */ |
| 117 | 0, /* bitpos */ |
| 118 | complain_overflow_dont, /* complain_on_overflow */ |
| 119 | NULL, /* special_function */ |
| 120 | "R_MCORE_NONE", /* name */ |
| 121 | FALSE, /* partial_inplace */ |
| 122 | 0, /* src_mask */ |
| 123 | 0, /* dst_mask */ |
| 124 | FALSE), /* pcrel_offset */ |
| 125 | |
| 126 | /* A standard 32 bit relocation. */ |
| 127 | HOWTO (R_MCORE_ADDR32, /* type */ |
| 128 | 0, /* rightshift */ |
| 129 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 130 | 32, /* bitsize */ |
| 131 | FALSE, /* pc_relative */ |
| 132 | 0, /* bitpos */ |
| 133 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 134 | bfd_elf_generic_reloc, /* special_function */ |
| 135 | "ADDR32", /* name *//* For compatibility with coff/pe port. */ |
| 136 | FALSE, /* partial_inplace */ |
| 137 | 0x0, /* src_mask */ |
| 138 | 0xffffffff, /* dst_mask */ |
| 139 | FALSE), /* pcrel_offset */ |
| 140 | |
| 141 | /* 8 bits + 2 zero bits; jmpi/jsri/lrw instructions. |
| 142 | Should not appear in object files. */ |
| 143 | HOWTO (R_MCORE_PCRELIMM8BY4, /* type */ |
| 144 | 2, /* rightshift */ |
| 145 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 146 | 8, /* bitsize */ |
| 147 | TRUE, /* pc_relative */ |
| 148 | 0, /* bitpos */ |
| 149 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 150 | mcore_elf_unsupported_reloc, /* special_function */ |
| 151 | "R_MCORE_PCRELIMM8BY4",/* name */ |
| 152 | FALSE, /* partial_inplace */ |
| 153 | 0, /* src_mask */ |
| 154 | 0, /* dst_mask */ |
| 155 | TRUE), /* pcrel_offset */ |
| 156 | |
| 157 | /* bsr/bt/bf/br instructions; 11 bits + 1 zero bit |
| 158 | Span 2k instructions == 4k bytes. |
| 159 | Only useful pieces at the relocated address are the opcode (5 bits) */ |
| 160 | HOWTO (R_MCORE_PCRELIMM11BY2,/* type */ |
| 161 | 1, /* rightshift */ |
| 162 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 163 | 11, /* bitsize */ |
| 164 | TRUE, /* pc_relative */ |
| 165 | 0, /* bitpos */ |
| 166 | complain_overflow_signed, /* complain_on_overflow */ |
| 167 | bfd_elf_generic_reloc, /* special_function */ |
| 168 | "R_MCORE_PCRELIMM11BY2",/* name */ |
| 169 | FALSE, /* partial_inplace */ |
| 170 | 0x0, /* src_mask */ |
| 171 | 0x7ff, /* dst_mask */ |
| 172 | TRUE), /* pcrel_offset */ |
| 173 | |
| 174 | /* 4 bits + 1 zero bit; 'loopt' instruction only; unsupported. */ |
| 175 | HOWTO (R_MCORE_PCRELIMM4BY2, /* type */ |
| 176 | 1, /* rightshift */ |
| 177 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 178 | 4, /* bitsize */ |
| 179 | TRUE, /* pc_relative */ |
| 180 | 0, /* bitpos */ |
| 181 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 182 | mcore_elf_unsupported_reloc,/* special_function */ |
| 183 | "R_MCORE_PCRELIMM4BY2",/* name */ |
| 184 | FALSE, /* partial_inplace */ |
| 185 | 0, /* src_mask */ |
| 186 | 0, /* dst_mask */ |
| 187 | TRUE), /* pcrel_offset */ |
| 188 | |
| 189 | /* 32-bit pc-relative. Eventually this will help support PIC code. */ |
| 190 | HOWTO (R_MCORE_PCREL32, /* type */ |
| 191 | 0, /* rightshift */ |
| 192 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 193 | 32, /* bitsize */ |
| 194 | TRUE, /* pc_relative */ |
| 195 | 0, /* bitpos */ |
| 196 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 197 | bfd_elf_generic_reloc, /* special_function */ |
| 198 | "R_MCORE_PCREL32", /* name */ |
| 199 | FALSE, /* partial_inplace */ |
| 200 | 0x0, /* src_mask */ |
| 201 | 0xffffffff, /* dst_mask */ |
| 202 | TRUE), /* pcrel_offset */ |
| 203 | |
| 204 | /* Like PCRELIMM11BY2, this relocation indicates that there is a |
| 205 | 'jsri' at the specified address. There is a separate relocation |
| 206 | entry for the literal pool entry that it references, but we |
| 207 | might be able to change the jsri to a bsr if the target turns out |
| 208 | to be close enough [even though we won't reclaim the literal pool |
| 209 | entry, we'll get some runtime efficiency back]. Note that this |
| 210 | is a relocation that we are allowed to safely ignore. */ |
| 211 | HOWTO (R_MCORE_PCRELJSR_IMM11BY2,/* type */ |
| 212 | 1, /* rightshift */ |
| 213 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 214 | 11, /* bitsize */ |
| 215 | TRUE, /* pc_relative */ |
| 216 | 0, /* bitpos */ |
| 217 | complain_overflow_signed, /* complain_on_overflow */ |
| 218 | bfd_elf_generic_reloc, /* special_function */ |
| 219 | "R_MCORE_PCRELJSR_IMM11BY2", /* name */ |
| 220 | FALSE, /* partial_inplace */ |
| 221 | 0x0, /* src_mask */ |
| 222 | 0x7ff, /* dst_mask */ |
| 223 | TRUE), /* pcrel_offset */ |
| 224 | |
| 225 | /* GNU extension to record C++ vtable hierarchy. */ |
| 226 | HOWTO (R_MCORE_GNU_VTINHERIT, /* type */ |
| 227 | 0, /* rightshift */ |
| 228 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 229 | 0, /* bitsize */ |
| 230 | FALSE, /* pc_relative */ |
| 231 | 0, /* bitpos */ |
| 232 | complain_overflow_dont, /* complain_on_overflow */ |
| 233 | NULL, /* special_function */ |
| 234 | "R_MCORE_GNU_VTINHERIT", /* name */ |
| 235 | FALSE, /* partial_inplace */ |
| 236 | 0, /* src_mask */ |
| 237 | 0, /* dst_mask */ |
| 238 | FALSE), /* pcrel_offset */ |
| 239 | |
| 240 | /* GNU extension to record C++ vtable member usage. */ |
| 241 | HOWTO (R_MCORE_GNU_VTENTRY, /* type */ |
| 242 | 0, /* rightshift */ |
| 243 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 244 | 0, /* bitsize */ |
| 245 | FALSE, /* pc_relative */ |
| 246 | 0, /* bitpos */ |
| 247 | complain_overflow_dont,/* complain_on_overflow */ |
| 248 | _bfd_elf_rel_vtable_reloc_fn, /* special_function */ |
| 249 | "R_MCORE_GNU_VTENTRY", /* name */ |
| 250 | FALSE, /* partial_inplace */ |
| 251 | 0, /* src_mask */ |
| 252 | 0, /* dst_mask */ |
| 253 | FALSE), /* pcrel_offset */ |
| 254 | |
| 255 | HOWTO (R_MCORE_RELATIVE, /* 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_signed, /* complain_on_overflow */ |
| 262 | NULL, /* special_function */ |
| 263 | "R_MCORE_RELATIVE", /* name */ |
| 264 | TRUE, /* partial_inplace */ |
| 265 | 0xffffffff, /* src_mask */ |
| 266 | 0xffffffff, /* dst_mask */ |
| 267 | FALSE) /* pcrel_offset */ |
| 268 | }; |
| 269 | |
| 270 | #ifndef NUM_ELEM |
| 271 | #define NUM_ELEM(a) (sizeof (a) / sizeof (a)[0]) |
| 272 | #endif |
| 273 | \f |
| 274 | /* Initialize the mcore_elf_howto_table, so that linear accesses can be done. */ |
| 275 | static void |
| 276 | mcore_elf_howto_init (void) |
| 277 | { |
| 278 | unsigned int i; |
| 279 | |
| 280 | for (i = NUM_ELEM (mcore_elf_howto_raw); i--;) |
| 281 | { |
| 282 | unsigned int type; |
| 283 | |
| 284 | type = mcore_elf_howto_raw[i].type; |
| 285 | |
| 286 | BFD_ASSERT (type < NUM_ELEM (mcore_elf_howto_table)); |
| 287 | |
| 288 | mcore_elf_howto_table [type] = & mcore_elf_howto_raw [i]; |
| 289 | } |
| 290 | } |
| 291 | \f |
| 292 | static reloc_howto_type * |
| 293 | mcore_elf_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED, |
| 294 | bfd_reloc_code_real_type code) |
| 295 | { |
| 296 | enum elf_mcore_reloc_type mcore_reloc = R_MCORE_NONE; |
| 297 | |
| 298 | switch (code) |
| 299 | { |
| 300 | case BFD_RELOC_NONE: mcore_reloc = R_MCORE_NONE; break; |
| 301 | case BFD_RELOC_32: mcore_reloc = R_MCORE_ADDR32; break; |
| 302 | case BFD_RELOC_MCORE_PCREL_IMM8BY4: mcore_reloc = R_MCORE_PCRELIMM8BY4; break; |
| 303 | case BFD_RELOC_MCORE_PCREL_IMM11BY2: mcore_reloc = R_MCORE_PCRELIMM11BY2; break; |
| 304 | case BFD_RELOC_MCORE_PCREL_IMM4BY2: mcore_reloc = R_MCORE_PCRELIMM4BY2; break; |
| 305 | case BFD_RELOC_32_PCREL: mcore_reloc = R_MCORE_PCREL32; break; |
| 306 | case BFD_RELOC_MCORE_PCREL_JSR_IMM11BY2: mcore_reloc = R_MCORE_PCRELJSR_IMM11BY2; break; |
| 307 | case BFD_RELOC_VTABLE_INHERIT: mcore_reloc = R_MCORE_GNU_VTINHERIT; break; |
| 308 | case BFD_RELOC_VTABLE_ENTRY: mcore_reloc = R_MCORE_GNU_VTENTRY; break; |
| 309 | case BFD_RELOC_RVA: mcore_reloc = R_MCORE_RELATIVE; break; |
| 310 | default: |
| 311 | return NULL; |
| 312 | } |
| 313 | |
| 314 | if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4]) |
| 315 | /* Initialize howto table if needed. */ |
| 316 | mcore_elf_howto_init (); |
| 317 | |
| 318 | return mcore_elf_howto_table [(int) mcore_reloc]; |
| 319 | }; |
| 320 | |
| 321 | static reloc_howto_type * |
| 322 | mcore_elf_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 323 | const char *r_name) |
| 324 | { |
| 325 | unsigned int i; |
| 326 | |
| 327 | for (i = 0; |
| 328 | i < sizeof (mcore_elf_howto_raw) / sizeof (mcore_elf_howto_raw[0]); |
| 329 | i++) |
| 330 | if (mcore_elf_howto_raw[i].name != NULL |
| 331 | && strcasecmp (mcore_elf_howto_raw[i].name, r_name) == 0) |
| 332 | return &mcore_elf_howto_raw[i]; |
| 333 | |
| 334 | return NULL; |
| 335 | } |
| 336 | |
| 337 | /* Set the howto pointer for a RCE ELF reloc. */ |
| 338 | |
| 339 | static bfd_boolean |
| 340 | mcore_elf_info_to_howto (bfd * abfd, |
| 341 | arelent * cache_ptr, |
| 342 | Elf_Internal_Rela * dst) |
| 343 | { |
| 344 | unsigned int r_type; |
| 345 | |
| 346 | if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4]) |
| 347 | /* Initialize howto table if needed. */ |
| 348 | mcore_elf_howto_init (); |
| 349 | |
| 350 | r_type = ELF32_R_TYPE (dst->r_info); |
| 351 | if (r_type >= R_MCORE_max) |
| 352 | { |
| 353 | /* xgettext:c-format */ |
| 354 | _bfd_error_handler (_("%pB: unsupported relocation type %#x"), |
| 355 | abfd, r_type); |
| 356 | bfd_set_error (bfd_error_bad_value); |
| 357 | return FALSE; |
| 358 | } |
| 359 | |
| 360 | cache_ptr->howto = mcore_elf_howto_table [r_type]; |
| 361 | return TRUE; |
| 362 | } |
| 363 | \f |
| 364 | /* The RELOCATE_SECTION function is called by the ELF backend linker |
| 365 | to handle the relocations for a section. |
| 366 | |
| 367 | The relocs are always passed as Rela structures; if the section |
| 368 | actually uses Rel structures, the r_addend field will always be |
| 369 | zero. |
| 370 | |
| 371 | This function is responsible for adjust the section contents as |
| 372 | necessary, and (if using Rela relocs and generating a |
| 373 | relocatable output file) adjusting the reloc addend as |
| 374 | necessary. |
| 375 | |
| 376 | This function does not have to worry about setting the reloc |
| 377 | address or the reloc symbol index. |
| 378 | |
| 379 | LOCAL_SYMS is a pointer to the swapped in local symbols. |
| 380 | |
| 381 | LOCAL_SECTIONS is an array giving the section in the input file |
| 382 | corresponding to the st_shndx field of each local symbol. |
| 383 | |
| 384 | The global hash table entry for the global symbols can be found |
| 385 | via elf_sym_hashes (input_bfd). |
| 386 | |
| 387 | When generating relocatable output, this function must handle |
| 388 | STB_LOCAL/STT_SECTION symbols specially. The output symbol is |
| 389 | going to be the section symbol corresponding to the output |
| 390 | section, which means that the addend must be adjusted |
| 391 | accordingly. */ |
| 392 | |
| 393 | static bfd_boolean |
| 394 | mcore_elf_relocate_section (bfd * output_bfd, |
| 395 | struct bfd_link_info * info, |
| 396 | bfd * input_bfd, |
| 397 | asection * input_section, |
| 398 | bfd_byte * contents, |
| 399 | Elf_Internal_Rela * relocs, |
| 400 | Elf_Internal_Sym * local_syms, |
| 401 | asection ** local_sections) |
| 402 | { |
| 403 | Elf_Internal_Shdr * symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; |
| 404 | struct elf_link_hash_entry ** sym_hashes = elf_sym_hashes (input_bfd); |
| 405 | Elf_Internal_Rela * rel = relocs; |
| 406 | Elf_Internal_Rela * relend = relocs + input_section->reloc_count; |
| 407 | bfd_boolean ret = TRUE; |
| 408 | |
| 409 | #ifdef DEBUG |
| 410 | _bfd_error_handler |
| 411 | ("mcore_elf_relocate_section called for %pB section %pA, %u relocations%s", |
| 412 | input_bfd, |
| 413 | input_section, |
| 414 | input_section->reloc_count, |
| 415 | (bfd_link_relocatable (info)) ? " (relocatable)" : ""); |
| 416 | #endif |
| 417 | |
| 418 | if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4]) /* Initialize howto table if needed */ |
| 419 | mcore_elf_howto_init (); |
| 420 | |
| 421 | for (; rel < relend; rel++) |
| 422 | { |
| 423 | enum elf_mcore_reloc_type r_type = (enum elf_mcore_reloc_type) ELF32_R_TYPE (rel->r_info); |
| 424 | bfd_vma offset = rel->r_offset; |
| 425 | bfd_vma addend = rel->r_addend; |
| 426 | bfd_reloc_status_type r = bfd_reloc_other; |
| 427 | asection * sec = NULL; |
| 428 | reloc_howto_type * howto; |
| 429 | bfd_vma relocation; |
| 430 | Elf_Internal_Sym * sym = NULL; |
| 431 | unsigned long r_symndx; |
| 432 | struct elf_link_hash_entry * h = NULL; |
| 433 | unsigned short oldinst = 0; |
| 434 | |
| 435 | /* Unknown relocation handling. */ |
| 436 | if ((unsigned) r_type >= (unsigned) R_MCORE_max |
| 437 | || ! mcore_elf_howto_table [(int)r_type]) |
| 438 | { |
| 439 | /* xgettext:c-format */ |
| 440 | _bfd_error_handler (_("%pB: unsupported relocation type %#x"), |
| 441 | input_bfd, (int) r_type); |
| 442 | |
| 443 | bfd_set_error (bfd_error_bad_value); |
| 444 | ret = FALSE; |
| 445 | continue; |
| 446 | } |
| 447 | |
| 448 | howto = mcore_elf_howto_table [(int) r_type]; |
| 449 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 450 | |
| 451 | /* Complain about known relocation that are not yet supported. */ |
| 452 | if (howto->special_function == mcore_elf_unsupported_reloc) |
| 453 | { |
| 454 | /* xgettext:c-format */ |
| 455 | _bfd_error_handler (_("%pB: %s unsupported"), |
| 456 | input_bfd, |
| 457 | howto->name); |
| 458 | |
| 459 | bfd_set_error (bfd_error_bad_value); |
| 460 | ret = FALSE; |
| 461 | continue; |
| 462 | } |
| 463 | |
| 464 | if (r_symndx < symtab_hdr->sh_info) |
| 465 | { |
| 466 | sym = local_syms + r_symndx; |
| 467 | sec = local_sections [r_symndx]; |
| 468 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); |
| 469 | addend = rel->r_addend; |
| 470 | } |
| 471 | else |
| 472 | { |
| 473 | bfd_boolean unresolved_reloc, warned, ignored; |
| 474 | |
| 475 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
| 476 | r_symndx, symtab_hdr, sym_hashes, |
| 477 | h, sec, relocation, |
| 478 | unresolved_reloc, warned, ignored); |
| 479 | } |
| 480 | |
| 481 | if (sec != NULL && discarded_section (sec)) |
| 482 | RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, |
| 483 | rel, 1, relend, howto, 0, contents); |
| 484 | |
| 485 | if (bfd_link_relocatable (info)) |
| 486 | continue; |
| 487 | |
| 488 | switch (r_type) |
| 489 | { |
| 490 | default: |
| 491 | break; |
| 492 | |
| 493 | case R_MCORE_PCRELJSR_IMM11BY2: |
| 494 | oldinst = bfd_get_16 (input_bfd, contents + offset); |
| 495 | #define MCORE_INST_BSR 0xF800 |
| 496 | bfd_put_16 (input_bfd, (bfd_vma) MCORE_INST_BSR, contents + offset); |
| 497 | break; |
| 498 | } |
| 499 | |
| 500 | #ifdef DEBUG |
| 501 | fprintf (stderr, "\ttype = %s (%d), symbol index = %ld, offset = %ld, addend = %ld\n", |
| 502 | howto->name, r_type, r_symndx, (long) offset, (long) addend); |
| 503 | #endif |
| 504 | |
| 505 | r = _bfd_final_link_relocate |
| 506 | (howto, input_bfd, input_section, contents, offset, relocation, addend); |
| 507 | |
| 508 | if (r != bfd_reloc_ok && r_type == R_MCORE_PCRELJSR_IMM11BY2) |
| 509 | { |
| 510 | /* Wasn't ok, back it out and give up. */ |
| 511 | bfd_put_16 (input_bfd, (bfd_vma) oldinst, contents + offset); |
| 512 | r = bfd_reloc_ok; |
| 513 | } |
| 514 | |
| 515 | if (r != bfd_reloc_ok) |
| 516 | { |
| 517 | ret = FALSE; |
| 518 | |
| 519 | switch (r) |
| 520 | { |
| 521 | default: |
| 522 | break; |
| 523 | |
| 524 | case bfd_reloc_overflow: |
| 525 | { |
| 526 | const char * name; |
| 527 | |
| 528 | if (h != NULL) |
| 529 | name = NULL; |
| 530 | else |
| 531 | { |
| 532 | name = bfd_elf_string_from_elf_section |
| 533 | (input_bfd, symtab_hdr->sh_link, sym->st_name); |
| 534 | |
| 535 | if (name == NULL) |
| 536 | break; |
| 537 | |
| 538 | if (* name == '\0') |
| 539 | name = bfd_section_name (input_bfd, sec); |
| 540 | } |
| 541 | |
| 542 | (*info->callbacks->reloc_overflow) |
| 543 | (info, (h ? &h->root : NULL), name, howto->name, |
| 544 | (bfd_vma) 0, input_bfd, input_section, offset); |
| 545 | } |
| 546 | break; |
| 547 | } |
| 548 | } |
| 549 | } |
| 550 | |
| 551 | #ifdef DEBUG |
| 552 | fprintf (stderr, "\n"); |
| 553 | #endif |
| 554 | |
| 555 | return ret; |
| 556 | } |
| 557 | \f |
| 558 | /* Return the section that should be marked against GC for a given |
| 559 | relocation. */ |
| 560 | |
| 561 | static asection * |
| 562 | mcore_elf_gc_mark_hook (asection *sec, |
| 563 | struct bfd_link_info *info, |
| 564 | Elf_Internal_Rela *rel, |
| 565 | struct elf_link_hash_entry *h, |
| 566 | Elf_Internal_Sym *sym) |
| 567 | { |
| 568 | if (h != NULL) |
| 569 | switch (ELF32_R_TYPE (rel->r_info)) |
| 570 | { |
| 571 | case R_MCORE_GNU_VTINHERIT: |
| 572 | case R_MCORE_GNU_VTENTRY: |
| 573 | return NULL; |
| 574 | } |
| 575 | |
| 576 | return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); |
| 577 | } |
| 578 | |
| 579 | /* Look through the relocs for a section during the first phase. |
| 580 | Since we don't do .gots or .plts, we just need to consider the |
| 581 | virtual table relocs for gc. */ |
| 582 | |
| 583 | static bfd_boolean |
| 584 | mcore_elf_check_relocs (bfd * abfd, |
| 585 | struct bfd_link_info * info, |
| 586 | asection * sec, |
| 587 | const Elf_Internal_Rela * relocs) |
| 588 | { |
| 589 | Elf_Internal_Shdr * symtab_hdr; |
| 590 | struct elf_link_hash_entry ** sym_hashes; |
| 591 | const Elf_Internal_Rela * rel; |
| 592 | const Elf_Internal_Rela * rel_end; |
| 593 | |
| 594 | if (bfd_link_relocatable (info)) |
| 595 | return TRUE; |
| 596 | |
| 597 | symtab_hdr = & elf_tdata (abfd)->symtab_hdr; |
| 598 | sym_hashes = elf_sym_hashes (abfd); |
| 599 | |
| 600 | rel_end = relocs + sec->reloc_count; |
| 601 | |
| 602 | for (rel = relocs; rel < rel_end; rel++) |
| 603 | { |
| 604 | struct elf_link_hash_entry * h; |
| 605 | unsigned long r_symndx; |
| 606 | |
| 607 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 608 | |
| 609 | if (r_symndx < symtab_hdr->sh_info) |
| 610 | h = NULL; |
| 611 | else |
| 612 | { |
| 613 | h = sym_hashes [r_symndx - symtab_hdr->sh_info]; |
| 614 | while (h->root.type == bfd_link_hash_indirect |
| 615 | || h->root.type == bfd_link_hash_warning) |
| 616 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 617 | } |
| 618 | |
| 619 | switch (ELF32_R_TYPE (rel->r_info)) |
| 620 | { |
| 621 | /* This relocation describes the C++ object vtable hierarchy. |
| 622 | Reconstruct it for later use during GC. */ |
| 623 | case R_MCORE_GNU_VTINHERIT: |
| 624 | if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) |
| 625 | return FALSE; |
| 626 | break; |
| 627 | |
| 628 | /* This relocation describes which C++ vtable entries are actually |
| 629 | used. Record for later use during GC. */ |
| 630 | case R_MCORE_GNU_VTENTRY: |
| 631 | if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) |
| 632 | return FALSE; |
| 633 | break; |
| 634 | } |
| 635 | } |
| 636 | |
| 637 | return TRUE; |
| 638 | } |
| 639 | |
| 640 | static const struct bfd_elf_special_section mcore_elf_special_sections[]= |
| 641 | { |
| 642 | { STRING_COMMA_LEN (".ctors"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE }, |
| 643 | { STRING_COMMA_LEN (".dtors"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE }, |
| 644 | { NULL, 0, 0, 0, 0 } |
| 645 | }; |
| 646 | |
| 647 | #define TARGET_BIG_SYM mcore_elf32_be_vec |
| 648 | #define TARGET_BIG_NAME "elf32-mcore-big" |
| 649 | #define TARGET_LITTLE_SYM mcore_elf32_le_vec |
| 650 | #define TARGET_LITTLE_NAME "elf32-mcore-little" |
| 651 | |
| 652 | #define ELF_ARCH bfd_arch_mcore |
| 653 | #define ELF_MACHINE_CODE EM_MCORE |
| 654 | #define ELF_MAXPAGESIZE 0x1000 /* 4k, if we ever have 'em */ |
| 655 | #define elf_info_to_howto mcore_elf_info_to_howto |
| 656 | #define elf_info_to_howto_rel NULL |
| 657 | |
| 658 | #define bfd_elf32_bfd_merge_private_bfd_data mcore_elf_merge_private_bfd_data |
| 659 | #define bfd_elf32_bfd_set_private_flags mcore_elf_set_private_flags |
| 660 | #define bfd_elf32_bfd_reloc_type_lookup mcore_elf_reloc_type_lookup |
| 661 | #define bfd_elf32_bfd_reloc_name_lookup mcore_elf_reloc_name_lookup |
| 662 | #define elf_backend_relocate_section mcore_elf_relocate_section |
| 663 | #define elf_backend_gc_mark_hook mcore_elf_gc_mark_hook |
| 664 | #define elf_backend_check_relocs mcore_elf_check_relocs |
| 665 | #define elf_backend_special_sections mcore_elf_special_sections |
| 666 | |
| 667 | #define elf_backend_can_gc_sections 1 |
| 668 | #define elf_backend_rela_normal 1 |
| 669 | |
| 670 | #include "elf32-target.h" |