| 1 | /* IQ2000-specific support for 32-bit ELF. |
| 2 | Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2010, 2012 |
| 3 | Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of BFD, the Binary File Descriptor library. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ |
| 20 | |
| 21 | #include "sysdep.h" |
| 22 | #include "bfd.h" |
| 23 | #include "libbfd.h" |
| 24 | #include "elf-bfd.h" |
| 25 | #include "elf/iq2000.h" |
| 26 | |
| 27 | /* Forward declarations. */ |
| 28 | |
| 29 | static bfd_reloc_status_type iq2000_elf_howto_hi16_reloc (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); |
| 30 | |
| 31 | \f |
| 32 | static reloc_howto_type iq2000_elf_howto_table [] = |
| 33 | { |
| 34 | /* This reloc does nothing. */ |
| 35 | |
| 36 | HOWTO (R_IQ2000_NONE, /* type */ |
| 37 | 0, /* rightshift */ |
| 38 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 39 | 32, /* bitsize */ |
| 40 | FALSE, /* pc_relative */ |
| 41 | 0, /* bitpos */ |
| 42 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 43 | bfd_elf_generic_reloc, /* special_function */ |
| 44 | "R_IQ2000_NONE", /* name */ |
| 45 | FALSE, /* partial_inplace */ |
| 46 | 0, /* src_mask */ |
| 47 | 0, /* dst_mask */ |
| 48 | FALSE), /* pcrel_offset */ |
| 49 | |
| 50 | /* A 16 bit absolute relocation. */ |
| 51 | HOWTO (R_IQ2000_16, /* type */ |
| 52 | 0, /* rightshift */ |
| 53 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 54 | 16, /* bitsize */ |
| 55 | FALSE, /* pc_relative */ |
| 56 | 0, /* bitpos */ |
| 57 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 58 | bfd_elf_generic_reloc, /* special_function */ |
| 59 | "R_IQ2000_16", /* name */ |
| 60 | FALSE, /* partial_inplace */ |
| 61 | 0x0000, /* src_mask */ |
| 62 | 0xffff, /* dst_mask */ |
| 63 | FALSE), /* pcrel_offset */ |
| 64 | |
| 65 | /* A 32 bit absolute relocation. */ |
| 66 | HOWTO (R_IQ2000_32, /* type */ |
| 67 | 0, /* rightshift */ |
| 68 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 69 | 31, /* bitsize */ |
| 70 | FALSE, /* pc_relative */ |
| 71 | 0, /* bitpos */ |
| 72 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 73 | bfd_elf_generic_reloc, /* special_function */ |
| 74 | "R_IQ2000_32", /* name */ |
| 75 | FALSE, /* partial_inplace */ |
| 76 | 0x00000000, /* src_mask */ |
| 77 | 0x7fffffff, /* dst_mask */ |
| 78 | FALSE), /* pcrel_offset */ |
| 79 | |
| 80 | /* 26 bit branch address. */ |
| 81 | HOWTO (R_IQ2000_26, /* type */ |
| 82 | 2, /* rightshift */ |
| 83 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 84 | 26, /* bitsize */ |
| 85 | FALSE, /* pc_relative */ |
| 86 | 0, /* bitpos */ |
| 87 | complain_overflow_dont, /* complain_on_overflow */ |
| 88 | /* This needs complex overflow |
| 89 | detection, because the upper four |
| 90 | bits must match the PC. */ |
| 91 | bfd_elf_generic_reloc, /* special_function */ |
| 92 | "R_IQ2000_26", /* name */ |
| 93 | FALSE, /* partial_inplace */ |
| 94 | 0x00000000, /* src_mask */ |
| 95 | 0x03ffffff, /* dst_mask */ |
| 96 | FALSE), /* pcrel_offset */ |
| 97 | |
| 98 | /* 16 bit PC relative reference. */ |
| 99 | HOWTO (R_IQ2000_PC16, /* type */ |
| 100 | 2, /* rightshift */ |
| 101 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 102 | 16, /* bitsize */ |
| 103 | TRUE, /* pc_relative */ |
| 104 | 0, /* bitpos */ |
| 105 | complain_overflow_signed, /* complain_on_overflow */ |
| 106 | bfd_elf_generic_reloc, /* special_function */ |
| 107 | "R_IQ2000_PC16", /* name */ |
| 108 | FALSE, /* partial_inplace */ |
| 109 | 0x0000, /* src_mask */ |
| 110 | 0xffff, /* dst_mask */ |
| 111 | TRUE), /* pcrel_offset */ |
| 112 | |
| 113 | /* high 16 bits of symbol value. */ |
| 114 | HOWTO (R_IQ2000_HI16, /* type */ |
| 115 | 16, /* rightshift */ |
| 116 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 117 | 15, /* bitsize */ |
| 118 | FALSE, /* pc_relative */ |
| 119 | 0, /* bitpos */ |
| 120 | complain_overflow_dont, /* complain_on_overflow */ |
| 121 | iq2000_elf_howto_hi16_reloc, /* special_function */ |
| 122 | "R_IQ2000_HI16", /* name */ |
| 123 | FALSE, /* partial_inplace */ |
| 124 | 0x0000, /* src_mask */ |
| 125 | 0x7fff, /* dst_mask */ |
| 126 | FALSE), /* pcrel_offset */ |
| 127 | |
| 128 | /* Low 16 bits of symbol value. */ |
| 129 | HOWTO (R_IQ2000_LO16, /* type */ |
| 130 | 0, /* rightshift */ |
| 131 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 132 | 16, /* bitsize */ |
| 133 | FALSE, /* pc_relative */ |
| 134 | 0, /* bitpos */ |
| 135 | complain_overflow_dont, /* complain_on_overflow */ |
| 136 | bfd_elf_generic_reloc, /* special_function */ |
| 137 | "R_IQ2000_LO16", /* name */ |
| 138 | FALSE, /* partial_inplace */ |
| 139 | 0x0000, /* src_mask */ |
| 140 | 0xffff, /* dst_mask */ |
| 141 | FALSE), /* pcrel_offset */ |
| 142 | |
| 143 | /* 16-bit jump offset. */ |
| 144 | HOWTO (R_IQ2000_OFFSET_16, /* type */ |
| 145 | 2, /* rightshift */ |
| 146 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 147 | 16, /* bitsize */ |
| 148 | FALSE, /* pc_relative */ |
| 149 | 0, /* bitpos */ |
| 150 | complain_overflow_dont, /* complain_on_overflow */ |
| 151 | bfd_elf_generic_reloc, /* special_function */ |
| 152 | "R_IQ2000_OFFSET_16", /* name */ |
| 153 | FALSE, /* partial_inplace */ |
| 154 | 0x0000, /* src_mask */ |
| 155 | 0xffff, /* dst_mask */ |
| 156 | FALSE), /* pcrel_offset */ |
| 157 | |
| 158 | /* 21-bit jump offset. */ |
| 159 | HOWTO (R_IQ2000_OFFSET_21, /* type */ |
| 160 | 2, /* rightshift */ |
| 161 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 162 | 21, /* bitsize */ |
| 163 | FALSE, /* pc_relative */ |
| 164 | 0, /* bitpos */ |
| 165 | complain_overflow_dont, /* complain_on_overflow */ |
| 166 | bfd_elf_generic_reloc, /* special_function */ |
| 167 | "R_IQ2000_OFFSET_21", /* name */ |
| 168 | FALSE, /* partial_inplace */ |
| 169 | 0x000000, /* src_mask */ |
| 170 | 0x1fffff, /* dst_mask */ |
| 171 | FALSE), /* pcrel_offset */ |
| 172 | |
| 173 | /* unsigned high 16 bits of value. */ |
| 174 | HOWTO (R_IQ2000_OFFSET_21, /* type */ |
| 175 | 16, /* rightshift */ |
| 176 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 177 | 16, /* bitsize */ |
| 178 | FALSE, /* pc_relative */ |
| 179 | 0, /* bitpos */ |
| 180 | complain_overflow_dont, /* complain_on_overflow */ |
| 181 | bfd_elf_generic_reloc, /* special_function */ |
| 182 | "R_IQ2000_UHI16", /* name */ |
| 183 | FALSE, /* partial_inplace */ |
| 184 | 0x0000, /* src_mask */ |
| 185 | 0x7fff, /* dst_mask */ |
| 186 | FALSE), /* pcrel_offset */ |
| 187 | |
| 188 | /* A 32 bit absolute debug relocation. */ |
| 189 | HOWTO (R_IQ2000_32_DEBUG, /* type */ |
| 190 | 0, /* rightshift */ |
| 191 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 192 | 32, /* bitsize */ |
| 193 | FALSE, /* pc_relative */ |
| 194 | 0, /* bitpos */ |
| 195 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 196 | bfd_elf_generic_reloc, /* special_function */ |
| 197 | "R_IQ2000_32", /* name */ |
| 198 | FALSE, /* partial_inplace */ |
| 199 | 0x00000000, /* src_mask */ |
| 200 | 0xffffffff, /* dst_mask */ |
| 201 | FALSE), /* pcrel_offset */ |
| 202 | |
| 203 | }; |
| 204 | |
| 205 | /* GNU extension to record C++ vtable hierarchy. */ |
| 206 | static reloc_howto_type iq2000_elf_vtinherit_howto = |
| 207 | HOWTO (R_IQ2000_GNU_VTINHERIT, /* type */ |
| 208 | 0, /* rightshift */ |
| 209 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 210 | 0, /* bitsize */ |
| 211 | FALSE, /* pc_relative */ |
| 212 | 0, /* bitpos */ |
| 213 | complain_overflow_dont, /* complain_on_overflow */ |
| 214 | NULL, /* special_function */ |
| 215 | "R_IQ2000_GNU_VTINHERIT", /* name */ |
| 216 | FALSE, /* partial_inplace */ |
| 217 | 0, /* src_mask */ |
| 218 | 0, /* dst_mask */ |
| 219 | FALSE); /* pcrel_offset */ |
| 220 | |
| 221 | /* GNU extension to record C++ vtable member usage. */ |
| 222 | static reloc_howto_type iq2000_elf_vtentry_howto = |
| 223 | HOWTO (R_IQ2000_GNU_VTENTRY, /* type */ |
| 224 | 0, /* rightshift */ |
| 225 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 226 | 0, /* bitsize */ |
| 227 | FALSE, /* pc_relative */ |
| 228 | 0, /* bitpos */ |
| 229 | complain_overflow_dont, /* complain_on_overflow */ |
| 230 | NULL, /* special_function */ |
| 231 | "R_IQ2000_GNU_VTENTRY", /* name */ |
| 232 | FALSE, /* partial_inplace */ |
| 233 | 0, /* src_mask */ |
| 234 | 0, /* dst_mask */ |
| 235 | FALSE); /* pcrel_offset */ |
| 236 | |
| 237 | \f |
| 238 | static bfd_reloc_status_type |
| 239 | iq2000_elf_howto_hi16_reloc (bfd *abfd ATTRIBUTE_UNUSED, |
| 240 | arelent *reloc_entry, |
| 241 | asymbol *symbol, |
| 242 | void * data, |
| 243 | asection *input_section, |
| 244 | bfd *output_bfd, |
| 245 | char **error_message ATTRIBUTE_UNUSED) |
| 246 | { |
| 247 | bfd_reloc_status_type ret; |
| 248 | bfd_vma relocation; |
| 249 | |
| 250 | /* If we're relocating and this an external symbol, |
| 251 | we don't want to change anything. */ |
| 252 | if (output_bfd != (bfd *) NULL |
| 253 | && (symbol->flags & BSF_SECTION_SYM) == 0 |
| 254 | && reloc_entry->addend == 0) |
| 255 | { |
| 256 | reloc_entry->address += input_section->output_offset; |
| 257 | return bfd_reloc_ok; |
| 258 | } |
| 259 | |
| 260 | if (bfd_is_com_section (symbol->section)) |
| 261 | relocation = 0; |
| 262 | else |
| 263 | relocation = symbol->value; |
| 264 | |
| 265 | relocation += symbol->section->output_section->vma; |
| 266 | relocation += symbol->section->output_offset; |
| 267 | relocation += reloc_entry->addend; |
| 268 | |
| 269 | /* If %lo will have sign-extension, compensate by add 0x10000 to hi portion. */ |
| 270 | if (relocation & 0x8000) |
| 271 | reloc_entry->addend += 0x10000; |
| 272 | |
| 273 | /* Now do the reloc in the usual way. */ |
| 274 | ret = bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, |
| 275 | input_section, output_bfd, error_message); |
| 276 | |
| 277 | /* Put it back the way it was. */ |
| 278 | if (relocation & 0x8000) |
| 279 | reloc_entry->addend -= 0x10000; |
| 280 | |
| 281 | return ret; |
| 282 | } |
| 283 | |
| 284 | static bfd_reloc_status_type |
| 285 | iq2000_elf_relocate_hi16 (bfd *input_bfd, |
| 286 | Elf_Internal_Rela *relhi, |
| 287 | bfd_byte *contents, |
| 288 | bfd_vma value) |
| 289 | { |
| 290 | bfd_vma insn; |
| 291 | |
| 292 | insn = bfd_get_32 (input_bfd, contents + relhi->r_offset); |
| 293 | |
| 294 | value += relhi->r_addend; |
| 295 | value &= 0x7fffffff; /* Mask off top-bit which is Harvard mask bit. */ |
| 296 | |
| 297 | /* If top-bit of %lo value is on, this means that %lo will |
| 298 | sign-propagate and so we compensate by adding 1 to %hi value. */ |
| 299 | if (value & 0x8000) |
| 300 | value += 0x10000; |
| 301 | |
| 302 | value >>= 16; |
| 303 | insn = ((insn & ~0xFFFF) | value); |
| 304 | |
| 305 | bfd_put_32 (input_bfd, insn, contents + relhi->r_offset); |
| 306 | return bfd_reloc_ok; |
| 307 | } |
| 308 | |
| 309 | static bfd_reloc_status_type |
| 310 | iq2000_elf_relocate_offset16 (bfd *input_bfd, |
| 311 | Elf_Internal_Rela *rel, |
| 312 | bfd_byte *contents, |
| 313 | bfd_vma value, |
| 314 | bfd_vma location) |
| 315 | { |
| 316 | bfd_vma insn; |
| 317 | bfd_vma jtarget; |
| 318 | |
| 319 | insn = bfd_get_32 (input_bfd, contents + rel->r_offset); |
| 320 | |
| 321 | value += rel->r_addend; |
| 322 | |
| 323 | if (value & 3) |
| 324 | return bfd_reloc_dangerous; |
| 325 | |
| 326 | jtarget = (value & 0x3fffc) | (location & 0xf0000000L); |
| 327 | |
| 328 | if (jtarget != value) |
| 329 | return bfd_reloc_overflow; |
| 330 | |
| 331 | insn = (insn & ~0xFFFF) | ((value >> 2) & 0xFFFF); |
| 332 | |
| 333 | bfd_put_32 (input_bfd, insn, contents + rel->r_offset); |
| 334 | return bfd_reloc_ok; |
| 335 | } |
| 336 | |
| 337 | /* Map BFD reloc types to IQ2000 ELF reloc types. */ |
| 338 | |
| 339 | static reloc_howto_type * |
| 340 | iq2000_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 341 | bfd_reloc_code_real_type code) |
| 342 | { |
| 343 | /* Note that the iq2000_elf_howto_table is indxed by the R_ |
| 344 | constants. Thus, the order that the howto records appear in the |
| 345 | table *must* match the order of the relocation types defined in |
| 346 | include/elf/iq2000.h. */ |
| 347 | |
| 348 | switch (code) |
| 349 | { |
| 350 | case BFD_RELOC_NONE: |
| 351 | return &iq2000_elf_howto_table[ (int) R_IQ2000_NONE]; |
| 352 | case BFD_RELOC_16: |
| 353 | return &iq2000_elf_howto_table[ (int) R_IQ2000_16]; |
| 354 | case BFD_RELOC_32: |
| 355 | return &iq2000_elf_howto_table[ (int) R_IQ2000_32]; |
| 356 | case BFD_RELOC_MIPS_JMP: |
| 357 | return &iq2000_elf_howto_table[ (int) R_IQ2000_26]; |
| 358 | case BFD_RELOC_IQ2000_OFFSET_16: |
| 359 | return &iq2000_elf_howto_table[ (int) R_IQ2000_OFFSET_16]; |
| 360 | case BFD_RELOC_IQ2000_OFFSET_21: |
| 361 | return &iq2000_elf_howto_table[ (int) R_IQ2000_OFFSET_21]; |
| 362 | case BFD_RELOC_16_PCREL_S2: |
| 363 | return &iq2000_elf_howto_table[ (int) R_IQ2000_PC16]; |
| 364 | case BFD_RELOC_HI16: |
| 365 | return &iq2000_elf_howto_table[ (int) R_IQ2000_HI16]; |
| 366 | case BFD_RELOC_IQ2000_UHI16: |
| 367 | return &iq2000_elf_howto_table[ (int) R_IQ2000_UHI16]; |
| 368 | case BFD_RELOC_LO16: |
| 369 | return &iq2000_elf_howto_table[ (int) R_IQ2000_LO16]; |
| 370 | case BFD_RELOC_VTABLE_INHERIT: |
| 371 | return &iq2000_elf_vtinherit_howto; |
| 372 | case BFD_RELOC_VTABLE_ENTRY: |
| 373 | return &iq2000_elf_vtentry_howto; |
| 374 | default: |
| 375 | /* Pacify gcc -Wall. */ |
| 376 | return NULL; |
| 377 | } |
| 378 | return NULL; |
| 379 | } |
| 380 | |
| 381 | static reloc_howto_type * |
| 382 | iq2000_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name) |
| 383 | { |
| 384 | unsigned int i; |
| 385 | |
| 386 | for (i = 0; |
| 387 | i < (sizeof (iq2000_elf_howto_table) |
| 388 | / sizeof (iq2000_elf_howto_table[0])); |
| 389 | i++) |
| 390 | if (iq2000_elf_howto_table[i].name != NULL |
| 391 | && strcasecmp (iq2000_elf_howto_table[i].name, r_name) == 0) |
| 392 | return &iq2000_elf_howto_table[i]; |
| 393 | |
| 394 | if (strcasecmp (iq2000_elf_vtinherit_howto.name, r_name) == 0) |
| 395 | return &iq2000_elf_vtinherit_howto; |
| 396 | if (strcasecmp (iq2000_elf_vtentry_howto.name, r_name) == 0) |
| 397 | return &iq2000_elf_vtentry_howto; |
| 398 | |
| 399 | return NULL; |
| 400 | } |
| 401 | \f |
| 402 | /* Perform a single relocation. By default we use the standard BFD |
| 403 | routines. */ |
| 404 | |
| 405 | static bfd_reloc_status_type |
| 406 | iq2000_final_link_relocate (reloc_howto_type * howto, |
| 407 | bfd * input_bfd, |
| 408 | asection * input_section, |
| 409 | bfd_byte * contents, |
| 410 | Elf_Internal_Rela * rel, |
| 411 | bfd_vma relocation) |
| 412 | { |
| 413 | return _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 414 | contents, rel->r_offset, |
| 415 | relocation, rel->r_addend); |
| 416 | } |
| 417 | \f |
| 418 | /* Set the howto pointer for a IQ2000 ELF reloc. */ |
| 419 | |
| 420 | static void |
| 421 | iq2000_info_to_howto_rela (bfd * abfd ATTRIBUTE_UNUSED, |
| 422 | arelent * cache_ptr, |
| 423 | Elf_Internal_Rela * dst) |
| 424 | { |
| 425 | unsigned int r_type; |
| 426 | |
| 427 | r_type = ELF32_R_TYPE (dst->r_info); |
| 428 | switch (r_type) |
| 429 | { |
| 430 | case R_IQ2000_GNU_VTINHERIT: |
| 431 | cache_ptr->howto = & iq2000_elf_vtinherit_howto; |
| 432 | break; |
| 433 | |
| 434 | case R_IQ2000_GNU_VTENTRY: |
| 435 | cache_ptr->howto = & iq2000_elf_vtentry_howto; |
| 436 | break; |
| 437 | |
| 438 | default: |
| 439 | cache_ptr->howto = & iq2000_elf_howto_table [r_type]; |
| 440 | break; |
| 441 | } |
| 442 | } |
| 443 | |
| 444 | /* Look through the relocs for a section during the first phase. |
| 445 | Since we don't do .gots or .plts, we just need to consider the |
| 446 | virtual table relocs for gc. */ |
| 447 | |
| 448 | static bfd_boolean |
| 449 | iq2000_elf_check_relocs (bfd *abfd, |
| 450 | struct bfd_link_info *info, |
| 451 | asection *sec, |
| 452 | const Elf_Internal_Rela *relocs) |
| 453 | { |
| 454 | Elf_Internal_Shdr *symtab_hdr; |
| 455 | struct elf_link_hash_entry **sym_hashes; |
| 456 | const Elf_Internal_Rela *rel; |
| 457 | const Elf_Internal_Rela *rel_end; |
| 458 | bfd_boolean changed = FALSE; |
| 459 | |
| 460 | if (info->relocatable) |
| 461 | return TRUE; |
| 462 | |
| 463 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 464 | sym_hashes = elf_sym_hashes (abfd); |
| 465 | |
| 466 | rel_end = relocs + sec->reloc_count; |
| 467 | for (rel = relocs; rel < rel_end; rel++) |
| 468 | { |
| 469 | struct elf_link_hash_entry *h; |
| 470 | unsigned long r_symndx; |
| 471 | |
| 472 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 473 | if (r_symndx < symtab_hdr->sh_info) |
| 474 | h = NULL; |
| 475 | else |
| 476 | { |
| 477 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 478 | while (h->root.type == bfd_link_hash_indirect |
| 479 | || h->root.type == bfd_link_hash_warning) |
| 480 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 481 | |
| 482 | /* PR15323, ref flags aren't set for references in the same |
| 483 | object. */ |
| 484 | h->root.non_ir_ref = 1; |
| 485 | } |
| 486 | |
| 487 | switch (ELF32_R_TYPE (rel->r_info)) |
| 488 | { |
| 489 | /* This relocation describes the C++ object vtable |
| 490 | hierarchy. Reconstruct it for later use during GC. */ |
| 491 | case R_IQ2000_GNU_VTINHERIT: |
| 492 | if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) |
| 493 | return FALSE; |
| 494 | break; |
| 495 | |
| 496 | /* This relocation describes which C++ vtable entries |
| 497 | are actually used. Record for later use during GC. */ |
| 498 | case R_IQ2000_GNU_VTENTRY: |
| 499 | BFD_ASSERT (h != NULL); |
| 500 | if (h != NULL |
| 501 | && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) |
| 502 | return FALSE; |
| 503 | break; |
| 504 | |
| 505 | case R_IQ2000_32: |
| 506 | /* For debug section, change to special harvard-aware relocations. */ |
| 507 | if (CONST_STRNEQ (sec->name, ".debug") |
| 508 | || CONST_STRNEQ (sec->name, ".stab") |
| 509 | || CONST_STRNEQ (sec->name, ".eh_frame")) |
| 510 | { |
| 511 | ((Elf_Internal_Rela *) rel)->r_info |
| 512 | = ELF32_R_INFO (ELF32_R_SYM (rel->r_info), R_IQ2000_32_DEBUG); |
| 513 | changed = TRUE; |
| 514 | } |
| 515 | break; |
| 516 | } |
| 517 | } |
| 518 | |
| 519 | if (changed) |
| 520 | /* Note that we've changed relocs, otherwise if !info->keep_memory |
| 521 | we'll free the relocs and lose our changes. */ |
| 522 | elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs; |
| 523 | |
| 524 | return TRUE; |
| 525 | } |
| 526 | |
| 527 | \f |
| 528 | /* Relocate a IQ2000 ELF section. |
| 529 | There is some attempt to make this function usable for many architectures, |
| 530 | both USE_REL and USE_RELA ['twould be nice if such a critter existed], |
| 531 | if only to serve as a learning tool. |
| 532 | |
| 533 | The RELOCATE_SECTION function is called by the new ELF backend linker |
| 534 | to handle the relocations for a section. |
| 535 | |
| 536 | The relocs are always passed as Rela structures; if the section |
| 537 | actually uses Rel structures, the r_addend field will always be |
| 538 | zero. |
| 539 | |
| 540 | This function is responsible for adjusting the section contents as |
| 541 | necessary, and (if using Rela relocs and generating a relocatable |
| 542 | output file) adjusting the reloc addend as necessary. |
| 543 | |
| 544 | This function does not have to worry about setting the reloc |
| 545 | address or the reloc symbol index. |
| 546 | |
| 547 | LOCAL_SYMS is a pointer to the swapped in local symbols. |
| 548 | |
| 549 | LOCAL_SECTIONS is an array giving the section in the input file |
| 550 | corresponding to the st_shndx field of each local symbol. |
| 551 | |
| 552 | The global hash table entry for the global symbols can be found |
| 553 | via elf_sym_hashes (input_bfd). |
| 554 | |
| 555 | When generating relocatable output, this function must handle |
| 556 | STB_LOCAL/STT_SECTION symbols specially. The output symbol is |
| 557 | going to be the section symbol corresponding to the output |
| 558 | section, which means that the addend must be adjusted |
| 559 | accordingly. */ |
| 560 | |
| 561 | static bfd_boolean |
| 562 | iq2000_elf_relocate_section (bfd * output_bfd ATTRIBUTE_UNUSED, |
| 563 | struct bfd_link_info * info, |
| 564 | bfd * input_bfd, |
| 565 | asection * input_section, |
| 566 | bfd_byte * contents, |
| 567 | Elf_Internal_Rela * relocs, |
| 568 | Elf_Internal_Sym * local_syms, |
| 569 | asection ** local_sections) |
| 570 | { |
| 571 | Elf_Internal_Shdr * symtab_hdr; |
| 572 | struct elf_link_hash_entry ** sym_hashes; |
| 573 | Elf_Internal_Rela * rel; |
| 574 | Elf_Internal_Rela * relend; |
| 575 | |
| 576 | symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; |
| 577 | sym_hashes = elf_sym_hashes (input_bfd); |
| 578 | relend = relocs + input_section->reloc_count; |
| 579 | |
| 580 | for (rel = relocs; rel < relend; rel ++) |
| 581 | { |
| 582 | reloc_howto_type * howto; |
| 583 | unsigned long r_symndx; |
| 584 | Elf_Internal_Sym * sym; |
| 585 | asection * sec; |
| 586 | struct elf_link_hash_entry * h; |
| 587 | bfd_vma relocation; |
| 588 | bfd_reloc_status_type r; |
| 589 | const char * name = NULL; |
| 590 | int r_type; |
| 591 | |
| 592 | r_type = ELF32_R_TYPE (rel->r_info); |
| 593 | |
| 594 | if ( r_type == R_IQ2000_GNU_VTINHERIT |
| 595 | || r_type == R_IQ2000_GNU_VTENTRY) |
| 596 | continue; |
| 597 | |
| 598 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 599 | |
| 600 | howto = iq2000_elf_howto_table + ELF32_R_TYPE (rel->r_info); |
| 601 | h = NULL; |
| 602 | sym = NULL; |
| 603 | sec = NULL; |
| 604 | |
| 605 | if (r_symndx < symtab_hdr->sh_info) |
| 606 | { |
| 607 | asection *osec; |
| 608 | |
| 609 | sym = local_syms + r_symndx; |
| 610 | osec = sec = local_sections [r_symndx]; |
| 611 | if ((sec->flags & SEC_MERGE) |
| 612 | && ELF_ST_TYPE (sym->st_info) == STT_SECTION) |
| 613 | /* This relocation is relative to a section symbol that is |
| 614 | going to be merged. Change it so that it is relative |
| 615 | to the merged section symbol. */ |
| 616 | rel->r_addend = _bfd_elf_rel_local_sym (output_bfd, sym, &sec, |
| 617 | rel->r_addend); |
| 618 | |
| 619 | relocation = (sec->output_section->vma |
| 620 | + sec->output_offset |
| 621 | + sym->st_value); |
| 622 | |
| 623 | name = bfd_elf_string_from_elf_section |
| 624 | (input_bfd, symtab_hdr->sh_link, sym->st_name); |
| 625 | name = (name == NULL) ? bfd_section_name (input_bfd, osec) : name; |
| 626 | } |
| 627 | else |
| 628 | { |
| 629 | bfd_boolean unresolved_reloc; |
| 630 | bfd_boolean warned, ignored; |
| 631 | |
| 632 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
| 633 | r_symndx, symtab_hdr, sym_hashes, |
| 634 | h, sec, relocation, |
| 635 | unresolved_reloc, warned, ignored); |
| 636 | |
| 637 | name = h->root.root.string; |
| 638 | } |
| 639 | |
| 640 | if (sec != NULL && discarded_section (sec)) |
| 641 | RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, |
| 642 | rel, 1, relend, howto, 0, contents); |
| 643 | |
| 644 | if (info->relocatable) |
| 645 | continue; |
| 646 | |
| 647 | switch (r_type) |
| 648 | { |
| 649 | case R_IQ2000_HI16: |
| 650 | r = iq2000_elf_relocate_hi16 (input_bfd, rel, contents, relocation); |
| 651 | break; |
| 652 | |
| 653 | case R_IQ2000_OFFSET_16: |
| 654 | r = iq2000_elf_relocate_offset16 (input_bfd, rel, contents, relocation, |
| 655 | input_section->output_section->vma |
| 656 | + input_section->output_offset |
| 657 | + rel->r_offset); |
| 658 | break; |
| 659 | |
| 660 | case R_IQ2000_PC16: |
| 661 | rel->r_addend -= 4; |
| 662 | /* Fall through. */ |
| 663 | |
| 664 | default: |
| 665 | r = iq2000_final_link_relocate (howto, input_bfd, input_section, |
| 666 | contents, rel, relocation); |
| 667 | break; |
| 668 | } |
| 669 | |
| 670 | if (r != bfd_reloc_ok) |
| 671 | { |
| 672 | const char * msg = (const char *) NULL; |
| 673 | |
| 674 | switch (r) |
| 675 | { |
| 676 | case bfd_reloc_overflow: |
| 677 | r = info->callbacks->reloc_overflow |
| 678 | (info, (h ? &h->root : NULL), name, howto->name, |
| 679 | (bfd_vma) 0, input_bfd, input_section, rel->r_offset); |
| 680 | break; |
| 681 | |
| 682 | case bfd_reloc_undefined: |
| 683 | r = info->callbacks->undefined_symbol |
| 684 | (info, name, input_bfd, input_section, rel->r_offset, TRUE); |
| 685 | break; |
| 686 | |
| 687 | case bfd_reloc_outofrange: |
| 688 | msg = _("internal error: out of range error"); |
| 689 | break; |
| 690 | |
| 691 | case bfd_reloc_notsupported: |
| 692 | msg = _("internal error: unsupported relocation error"); |
| 693 | break; |
| 694 | |
| 695 | case bfd_reloc_dangerous: |
| 696 | msg = _("internal error: dangerous relocation"); |
| 697 | break; |
| 698 | |
| 699 | default: |
| 700 | msg = _("internal error: unknown error"); |
| 701 | break; |
| 702 | } |
| 703 | |
| 704 | if (msg) |
| 705 | r = info->callbacks->warning |
| 706 | (info, msg, name, input_bfd, input_section, rel->r_offset); |
| 707 | |
| 708 | if (! r) |
| 709 | return FALSE; |
| 710 | } |
| 711 | } |
| 712 | |
| 713 | return TRUE; |
| 714 | } |
| 715 | \f |
| 716 | |
| 717 | /* Return the section that should be marked against GC for a given |
| 718 | relocation. */ |
| 719 | |
| 720 | static asection * |
| 721 | iq2000_elf_gc_mark_hook (asection *sec, |
| 722 | struct bfd_link_info *info, |
| 723 | Elf_Internal_Rela *rel, |
| 724 | struct elf_link_hash_entry *h, |
| 725 | Elf_Internal_Sym *sym) |
| 726 | { |
| 727 | if (h != NULL) |
| 728 | switch (ELF32_R_TYPE (rel->r_info)) |
| 729 | { |
| 730 | case R_IQ2000_GNU_VTINHERIT: |
| 731 | case R_IQ2000_GNU_VTENTRY: |
| 732 | return NULL; |
| 733 | } |
| 734 | |
| 735 | return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); |
| 736 | } |
| 737 | |
| 738 | \f |
| 739 | /* Return the MACH for an e_flags value. */ |
| 740 | |
| 741 | static int |
| 742 | elf32_iq2000_machine (bfd *abfd) |
| 743 | { |
| 744 | switch (elf_elfheader (abfd)->e_flags & EF_IQ2000_CPU_MASK) |
| 745 | { |
| 746 | case EF_IQ2000_CPU_IQ10: |
| 747 | return bfd_mach_iq10; |
| 748 | |
| 749 | case EF_IQ2000_CPU_IQ2000: |
| 750 | default: |
| 751 | return bfd_mach_iq2000; |
| 752 | } |
| 753 | } |
| 754 | |
| 755 | \f |
| 756 | /* Function to set the ELF flag bits. */ |
| 757 | |
| 758 | static bfd_boolean |
| 759 | iq2000_elf_set_private_flags (bfd *abfd, flagword flags) |
| 760 | { |
| 761 | elf_elfheader (abfd)->e_flags = flags; |
| 762 | elf_flags_init (abfd) = TRUE; |
| 763 | return TRUE; |
| 764 | } |
| 765 | |
| 766 | /* Merge backend specific data from an object |
| 767 | file to the output object file when linking. */ |
| 768 | |
| 769 | static bfd_boolean |
| 770 | iq2000_elf_merge_private_bfd_data (bfd *ibfd, bfd *obfd) |
| 771 | { |
| 772 | flagword old_flags, old_partial; |
| 773 | flagword new_flags, new_partial; |
| 774 | bfd_boolean error = FALSE; |
| 775 | char new_opt[80]; |
| 776 | char old_opt[80]; |
| 777 | |
| 778 | new_opt[0] = old_opt[0] = '\0'; |
| 779 | new_flags = elf_elfheader (ibfd)->e_flags; |
| 780 | old_flags = elf_elfheader (obfd)->e_flags; |
| 781 | |
| 782 | if (!elf_flags_init (obfd)) |
| 783 | { |
| 784 | /* First call, no flags set. */ |
| 785 | elf_flags_init (obfd) = TRUE; |
| 786 | elf_elfheader (obfd)->e_flags = new_flags; |
| 787 | } |
| 788 | |
| 789 | else if (new_flags != old_flags) |
| 790 | { |
| 791 | /* Warn if different cpu is used, but allow a |
| 792 | specific cpu to override the generic cpu. */ |
| 793 | new_partial = (new_flags & EF_IQ2000_CPU_MASK); |
| 794 | old_partial = (old_flags & EF_IQ2000_CPU_MASK); |
| 795 | |
| 796 | if (new_partial != old_partial) |
| 797 | { |
| 798 | switch (new_partial) |
| 799 | { |
| 800 | case EF_IQ2000_CPU_IQ10: |
| 801 | strcat (new_opt, " -m10"); |
| 802 | break; |
| 803 | |
| 804 | default: |
| 805 | case EF_IQ2000_CPU_IQ2000: |
| 806 | strcat (new_opt, " -m2000"); |
| 807 | break; |
| 808 | } |
| 809 | |
| 810 | switch (old_partial) |
| 811 | { |
| 812 | case EF_IQ2000_CPU_IQ10: |
| 813 | strcat (old_opt, " -m10"); |
| 814 | break; |
| 815 | |
| 816 | default: |
| 817 | case EF_IQ2000_CPU_IQ2000: |
| 818 | strcat (old_opt, " -m2000"); |
| 819 | break; |
| 820 | } |
| 821 | } |
| 822 | |
| 823 | /* Print out any mismatches from above. */ |
| 824 | if (new_opt[0]) |
| 825 | { |
| 826 | error = TRUE; |
| 827 | _bfd_error_handler |
| 828 | (_("%s: compiled with %s and linked with modules compiled with %s"), |
| 829 | bfd_get_filename (ibfd), new_opt, old_opt); |
| 830 | } |
| 831 | |
| 832 | new_flags &= ~ EF_IQ2000_ALL_FLAGS; |
| 833 | old_flags &= ~ EF_IQ2000_ALL_FLAGS; |
| 834 | |
| 835 | /* Warn about any other mismatches. */ |
| 836 | if (new_flags != old_flags) |
| 837 | { |
| 838 | error = TRUE; |
| 839 | |
| 840 | _bfd_error_handler |
| 841 | (_("%s: uses different e_flags (0x%lx) fields than previous modules (0x%lx)"), |
| 842 | bfd_get_filename (ibfd), (long)new_flags, (long)old_flags); |
| 843 | } |
| 844 | } |
| 845 | |
| 846 | if (error) |
| 847 | bfd_set_error (bfd_error_bad_value); |
| 848 | |
| 849 | return !error; |
| 850 | } |
| 851 | |
| 852 | \f |
| 853 | static bfd_boolean |
| 854 | iq2000_elf_print_private_bfd_data (bfd *abfd, void * ptr) |
| 855 | { |
| 856 | FILE *file = (FILE *) ptr; |
| 857 | flagword flags; |
| 858 | |
| 859 | BFD_ASSERT (abfd != NULL && ptr != NULL); |
| 860 | |
| 861 | /* Print normal ELF private data. */ |
| 862 | _bfd_elf_print_private_bfd_data (abfd, ptr); |
| 863 | |
| 864 | flags = elf_elfheader (abfd)->e_flags; |
| 865 | fprintf (file, _("private flags = 0x%lx:"), (unsigned long) flags); |
| 866 | |
| 867 | switch (flags & EF_IQ2000_CPU_MASK) |
| 868 | { |
| 869 | case EF_IQ2000_CPU_IQ10: |
| 870 | fprintf (file, " -m10"); |
| 871 | break; |
| 872 | case EF_IQ2000_CPU_IQ2000: |
| 873 | fprintf (file, " -m2000"); |
| 874 | break; |
| 875 | default: |
| 876 | break; |
| 877 | } |
| 878 | |
| 879 | fputc ('\n', file); |
| 880 | return TRUE; |
| 881 | } |
| 882 | |
| 883 | static |
| 884 | bfd_boolean |
| 885 | iq2000_elf_object_p (bfd *abfd) |
| 886 | { |
| 887 | bfd_default_set_arch_mach (abfd, bfd_arch_iq2000, |
| 888 | elf32_iq2000_machine (abfd)); |
| 889 | return TRUE; |
| 890 | } |
| 891 | |
| 892 | \f |
| 893 | #define ELF_ARCH bfd_arch_iq2000 |
| 894 | #define ELF_MACHINE_CODE EM_IQ2000 |
| 895 | #define ELF_MAXPAGESIZE 0x1000 |
| 896 | |
| 897 | #define TARGET_BIG_SYM bfd_elf32_iq2000_vec |
| 898 | #define TARGET_BIG_NAME "elf32-iq2000" |
| 899 | |
| 900 | #define elf_info_to_howto_rel NULL |
| 901 | #define elf_info_to_howto iq2000_info_to_howto_rela |
| 902 | #define elf_backend_relocate_section iq2000_elf_relocate_section |
| 903 | #define elf_backend_gc_mark_hook iq2000_elf_gc_mark_hook |
| 904 | #define elf_backend_check_relocs iq2000_elf_check_relocs |
| 905 | #define elf_backend_object_p iq2000_elf_object_p |
| 906 | #define elf_backend_rela_normal 1 |
| 907 | |
| 908 | #define elf_backend_can_gc_sections 1 |
| 909 | |
| 910 | #define bfd_elf32_bfd_reloc_type_lookup iq2000_reloc_type_lookup |
| 911 | #define bfd_elf32_bfd_reloc_name_lookup iq2000_reloc_name_lookup |
| 912 | #define bfd_elf32_bfd_set_private_flags iq2000_elf_set_private_flags |
| 913 | #define bfd_elf32_bfd_merge_private_bfd_data iq2000_elf_merge_private_bfd_data |
| 914 | #define bfd_elf32_bfd_print_private_bfd_data iq2000_elf_print_private_bfd_data |
| 915 | |
| 916 | #include "elf32-target.h" |