| 1 | /* i370-specific support for 32-bit ELF |
| 2 | Copyright 1994, 1995, 1996, 1997, 1998, 2000, 2001, 2002, 2003, 2004, |
| 3 | 2005, 2006 Free Software Foundation, Inc. |
| 4 | Written by Ian Lance Taylor, Cygnus Support. |
| 5 | Hacked by Linas Vepstas for i370 linas@linas.org |
| 6 | |
| 7 | This file is part of BFD, the Binary File Descriptor library. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 2 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program; if not, write to the Free Software |
| 21 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 22 | MA 02110-1301, USA. */ |
| 23 | |
| 24 | /* This file is based on a preliminary PowerPC ELF ABI. |
| 25 | But its been hacked on for the IBM 360/370 architectures. |
| 26 | Basically, the 31bit relocation works, and just about everything |
| 27 | else is a wild card. In particular, don't expect shared libs or |
| 28 | dynamic loading to work ... its never been tested. */ |
| 29 | |
| 30 | #include "bfd.h" |
| 31 | #include "sysdep.h" |
| 32 | #include "bfdlink.h" |
| 33 | #include "libbfd.h" |
| 34 | #include "elf-bfd.h" |
| 35 | #include "elf/i370.h" |
| 36 | |
| 37 | static reloc_howto_type *i370_elf_howto_table[ (int)R_I370_max ]; |
| 38 | |
| 39 | static reloc_howto_type i370_elf_howto_raw[] = |
| 40 | { |
| 41 | /* This reloc does nothing. */ |
| 42 | HOWTO (R_I370_NONE, /* type */ |
| 43 | 0, /* rightshift */ |
| 44 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 45 | 32, /* bitsize */ |
| 46 | FALSE, /* pc_relative */ |
| 47 | 0, /* bitpos */ |
| 48 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 49 | bfd_elf_generic_reloc, /* special_function */ |
| 50 | "R_I370_NONE", /* name */ |
| 51 | FALSE, /* partial_inplace */ |
| 52 | 0, /* src_mask */ |
| 53 | 0, /* dst_mask */ |
| 54 | FALSE), /* pcrel_offset */ |
| 55 | |
| 56 | /* A standard 31 bit relocation. */ |
| 57 | HOWTO (R_I370_ADDR31, /* type */ |
| 58 | 0, /* rightshift */ |
| 59 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 60 | 31, /* bitsize */ |
| 61 | FALSE, /* pc_relative */ |
| 62 | 0, /* bitpos */ |
| 63 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 64 | bfd_elf_generic_reloc, /* special_function */ |
| 65 | "R_I370_ADDR31", /* name */ |
| 66 | FALSE, /* partial_inplace */ |
| 67 | 0, /* src_mask */ |
| 68 | 0x7fffffff, /* dst_mask */ |
| 69 | FALSE), /* pcrel_offset */ |
| 70 | |
| 71 | /* A standard 32 bit relocation. */ |
| 72 | HOWTO (R_I370_ADDR32, /* type */ |
| 73 | 0, /* rightshift */ |
| 74 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 75 | 32, /* bitsize */ |
| 76 | FALSE, /* pc_relative */ |
| 77 | 0, /* bitpos */ |
| 78 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 79 | bfd_elf_generic_reloc, /* special_function */ |
| 80 | "R_I370_ADDR32", /* name */ |
| 81 | FALSE, /* partial_inplace */ |
| 82 | 0, /* src_mask */ |
| 83 | 0xffffffff, /* dst_mask */ |
| 84 | FALSE), /* pcrel_offset */ |
| 85 | |
| 86 | /* A standard 16 bit relocation. */ |
| 87 | HOWTO (R_I370_ADDR16, /* type */ |
| 88 | 0, /* rightshift */ |
| 89 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 90 | 16, /* bitsize */ |
| 91 | FALSE, /* pc_relative */ |
| 92 | 0, /* bitpos */ |
| 93 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 94 | bfd_elf_generic_reloc, /* special_function */ |
| 95 | "R_I370_ADDR16", /* name */ |
| 96 | FALSE, /* partial_inplace */ |
| 97 | 0, /* src_mask */ |
| 98 | 0xffff, /* dst_mask */ |
| 99 | FALSE), /* pcrel_offset */ |
| 100 | |
| 101 | /* 31-bit PC relative. */ |
| 102 | HOWTO (R_I370_REL31, /* type */ |
| 103 | 0, /* rightshift */ |
| 104 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 105 | 31, /* bitsize */ |
| 106 | TRUE, /* pc_relative */ |
| 107 | 0, /* bitpos */ |
| 108 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 109 | bfd_elf_generic_reloc, /* special_function */ |
| 110 | "R_I370_REL31", /* name */ |
| 111 | FALSE, /* partial_inplace */ |
| 112 | 0, /* src_mask */ |
| 113 | 0x7fffffff, /* dst_mask */ |
| 114 | TRUE), /* pcrel_offset */ |
| 115 | |
| 116 | /* 32-bit PC relative. */ |
| 117 | HOWTO (R_I370_REL32, /* type */ |
| 118 | 0, /* rightshift */ |
| 119 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 120 | 32, /* bitsize */ |
| 121 | TRUE, /* pc_relative */ |
| 122 | 0, /* bitpos */ |
| 123 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 124 | bfd_elf_generic_reloc, /* special_function */ |
| 125 | "R_I370_REL32", /* name */ |
| 126 | FALSE, /* partial_inplace */ |
| 127 | 0, /* src_mask */ |
| 128 | 0xffffffff, /* dst_mask */ |
| 129 | TRUE), /* pcrel_offset */ |
| 130 | |
| 131 | /* A standard 12 bit relocation. */ |
| 132 | HOWTO (R_I370_ADDR12, /* type */ |
| 133 | 0, /* rightshift */ |
| 134 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 135 | 12, /* bitsize */ |
| 136 | FALSE, /* pc_relative */ |
| 137 | 0, /* bitpos */ |
| 138 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 139 | bfd_elf_generic_reloc, /* special_function */ |
| 140 | "R_I370_ADDR12", /* name */ |
| 141 | FALSE, /* partial_inplace */ |
| 142 | 0, /* src_mask */ |
| 143 | 0xfff, /* dst_mask */ |
| 144 | FALSE), /* pcrel_offset */ |
| 145 | |
| 146 | /* 12-bit PC relative. */ |
| 147 | HOWTO (R_I370_REL12, /* type */ |
| 148 | 0, /* rightshift */ |
| 149 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 150 | 12, /* bitsize */ |
| 151 | TRUE, /* pc_relative */ |
| 152 | 0, /* bitpos */ |
| 153 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 154 | bfd_elf_generic_reloc, /* special_function */ |
| 155 | "R_I370_REL12", /* name */ |
| 156 | FALSE, /* partial_inplace */ |
| 157 | 0, /* src_mask */ |
| 158 | 0xfff, /* dst_mask */ |
| 159 | TRUE), /* pcrel_offset */ |
| 160 | |
| 161 | /* A standard 8 bit relocation. */ |
| 162 | HOWTO (R_I370_ADDR8, /* type */ |
| 163 | 0, /* rightshift */ |
| 164 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 165 | 8, /* bitsize */ |
| 166 | FALSE, /* pc_relative */ |
| 167 | 0, /* bitpos */ |
| 168 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 169 | bfd_elf_generic_reloc, /* special_function */ |
| 170 | "R_I370_ADDR8", /* name */ |
| 171 | FALSE, /* partial_inplace */ |
| 172 | 0, /* src_mask */ |
| 173 | 0xff, /* dst_mask */ |
| 174 | FALSE), /* pcrel_offset */ |
| 175 | |
| 176 | /* 8-bit PC relative. */ |
| 177 | HOWTO (R_I370_REL8, /* type */ |
| 178 | 0, /* rightshift */ |
| 179 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 180 | 8, /* bitsize */ |
| 181 | TRUE, /* pc_relative */ |
| 182 | 0, /* bitpos */ |
| 183 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 184 | bfd_elf_generic_reloc, /* special_function */ |
| 185 | "R_I370_REL8", /* name */ |
| 186 | FALSE, /* partial_inplace */ |
| 187 | 0, /* src_mask */ |
| 188 | 0xff, /* dst_mask */ |
| 189 | TRUE), /* pcrel_offset */ |
| 190 | |
| 191 | /* This is used only by the dynamic linker. The symbol should exist |
| 192 | both in the object being run and in some shared library. The |
| 193 | dynamic linker copies the data addressed by the symbol from the |
| 194 | shared library into the object, because the object being |
| 195 | run has to have the data at some particular address. */ |
| 196 | HOWTO (R_I370_COPY, /* type */ |
| 197 | 0, /* rightshift */ |
| 198 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 199 | 32, /* bitsize */ |
| 200 | FALSE, /* pc_relative */ |
| 201 | 0, /* bitpos */ |
| 202 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 203 | bfd_elf_generic_reloc, /* special_function */ |
| 204 | "R_I370_COPY", /* name */ |
| 205 | FALSE, /* partial_inplace */ |
| 206 | 0, /* src_mask */ |
| 207 | 0, /* dst_mask */ |
| 208 | FALSE), /* pcrel_offset */ |
| 209 | |
| 210 | /* Used only by the dynamic linker. When the object is run, this |
| 211 | longword is set to the load address of the object, plus the |
| 212 | addend. */ |
| 213 | HOWTO (R_I370_RELATIVE, /* type */ |
| 214 | 0, /* rightshift */ |
| 215 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 216 | 32, /* bitsize */ |
| 217 | FALSE, /* pc_relative */ |
| 218 | 0, /* bitpos */ |
| 219 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 220 | bfd_elf_generic_reloc, /* special_function */ |
| 221 | "R_I370_RELATIVE", /* name */ |
| 222 | FALSE, /* partial_inplace */ |
| 223 | 0, /* src_mask */ |
| 224 | 0xffffffff, /* dst_mask */ |
| 225 | FALSE), /* pcrel_offset */ |
| 226 | |
| 227 | }; |
| 228 | \f |
| 229 | /* Initialize the i370_elf_howto_table, so that linear accesses can be done. */ |
| 230 | |
| 231 | static void |
| 232 | i370_elf_howto_init (void) |
| 233 | { |
| 234 | unsigned int i, type; |
| 235 | |
| 236 | for (i = 0; i < sizeof (i370_elf_howto_raw) / sizeof (i370_elf_howto_raw[0]); i++) |
| 237 | { |
| 238 | type = i370_elf_howto_raw[i].type; |
| 239 | BFD_ASSERT (type < sizeof (i370_elf_howto_table) / sizeof (i370_elf_howto_table[0])); |
| 240 | i370_elf_howto_table[type] = &i370_elf_howto_raw[i]; |
| 241 | } |
| 242 | } |
| 243 | |
| 244 | static reloc_howto_type * |
| 245 | i370_elf_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 246 | bfd_reloc_code_real_type code) |
| 247 | { |
| 248 | enum i370_reloc_type i370_reloc = R_I370_NONE; |
| 249 | |
| 250 | if (!i370_elf_howto_table[ R_I370_ADDR31 ]) |
| 251 | /* Initialize howto table if needed. */ |
| 252 | i370_elf_howto_init (); |
| 253 | |
| 254 | switch ((int) code) |
| 255 | { |
| 256 | default: |
| 257 | return NULL; |
| 258 | |
| 259 | case BFD_RELOC_NONE: i370_reloc = R_I370_NONE; break; |
| 260 | case BFD_RELOC_32: i370_reloc = R_I370_ADDR31; break; |
| 261 | case BFD_RELOC_16: i370_reloc = R_I370_ADDR16; break; |
| 262 | case BFD_RELOC_32_PCREL: i370_reloc = R_I370_REL31; break; |
| 263 | case BFD_RELOC_CTOR: i370_reloc = R_I370_ADDR31; break; |
| 264 | case BFD_RELOC_I370_D12: i370_reloc = R_I370_ADDR12; break; |
| 265 | } |
| 266 | |
| 267 | return i370_elf_howto_table[ (int)i370_reloc ]; |
| 268 | }; |
| 269 | |
| 270 | /* The name of the dynamic interpreter. This is put in the .interp |
| 271 | section. */ |
| 272 | |
| 273 | #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so" |
| 274 | |
| 275 | /* Set the howto pointer for an i370 ELF reloc. */ |
| 276 | |
| 277 | static void |
| 278 | i370_elf_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, |
| 279 | arelent *cache_ptr, |
| 280 | Elf_Internal_Rela *dst) |
| 281 | { |
| 282 | if (!i370_elf_howto_table[ R_I370_ADDR31 ]) |
| 283 | /* Initialize howto table. */ |
| 284 | i370_elf_howto_init (); |
| 285 | |
| 286 | BFD_ASSERT (ELF32_R_TYPE (dst->r_info) < (unsigned int) R_I370_max); |
| 287 | cache_ptr->howto = i370_elf_howto_table[ELF32_R_TYPE (dst->r_info)]; |
| 288 | } |
| 289 | |
| 290 | /* Hack alert -- the following several routines look generic to me ... |
| 291 | why are we bothering with them ? */ |
| 292 | /* Function to set whether a module needs the -mrelocatable bit set. */ |
| 293 | |
| 294 | static bfd_boolean |
| 295 | i370_elf_set_private_flags (bfd *abfd, flagword flags) |
| 296 | { |
| 297 | BFD_ASSERT (!elf_flags_init (abfd) |
| 298 | || elf_elfheader (abfd)->e_flags == flags); |
| 299 | |
| 300 | elf_elfheader (abfd)->e_flags = flags; |
| 301 | elf_flags_init (abfd) = TRUE; |
| 302 | return TRUE; |
| 303 | } |
| 304 | |
| 305 | /* Merge backend specific data from an object file to the output |
| 306 | object file when linking. */ |
| 307 | |
| 308 | static bfd_boolean |
| 309 | i370_elf_merge_private_bfd_data (bfd *ibfd, bfd *obfd) |
| 310 | { |
| 311 | flagword old_flags; |
| 312 | flagword new_flags; |
| 313 | |
| 314 | if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour |
| 315 | || bfd_get_flavour (obfd) != bfd_target_elf_flavour) |
| 316 | return TRUE; |
| 317 | |
| 318 | new_flags = elf_elfheader (ibfd)->e_flags; |
| 319 | old_flags = elf_elfheader (obfd)->e_flags; |
| 320 | if (!elf_flags_init (obfd)) /* First call, no flags set. */ |
| 321 | { |
| 322 | elf_flags_init (obfd) = TRUE; |
| 323 | elf_elfheader (obfd)->e_flags = new_flags; |
| 324 | } |
| 325 | |
| 326 | else if (new_flags == old_flags) /* Compatible flags are ok. */ |
| 327 | ; |
| 328 | |
| 329 | else /* Incompatible flags. */ |
| 330 | { |
| 331 | (*_bfd_error_handler) |
| 332 | ("%B: uses different e_flags (0x%lx) fields than previous modules (0x%lx)", |
| 333 | ibfd, (long) new_flags, (long) old_flags); |
| 334 | |
| 335 | bfd_set_error (bfd_error_bad_value); |
| 336 | return FALSE; |
| 337 | } |
| 338 | |
| 339 | return TRUE; |
| 340 | } |
| 341 | \f |
| 342 | /* Handle an i370 specific section when reading an object file. This |
| 343 | is called when elfcode.h finds a section with an unknown type. */ |
| 344 | /* XXX hack alert bogus This routine is mostly all junk and almost |
| 345 | certainly does the wrong thing. Its here simply because it does |
| 346 | just enough to allow glibc-2.1 ld.so to compile & link. */ |
| 347 | |
| 348 | static bfd_boolean |
| 349 | i370_elf_section_from_shdr (bfd *abfd, |
| 350 | Elf_Internal_Shdr *hdr, |
| 351 | const char *name, |
| 352 | int shindex) |
| 353 | { |
| 354 | asection *newsect; |
| 355 | flagword flags; |
| 356 | |
| 357 | if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex)) |
| 358 | return FALSE; |
| 359 | |
| 360 | newsect = hdr->bfd_section; |
| 361 | flags = bfd_get_section_flags (abfd, newsect); |
| 362 | if (hdr->sh_flags & SHF_EXCLUDE) |
| 363 | flags |= SEC_EXCLUDE; |
| 364 | |
| 365 | if (hdr->sh_type == SHT_ORDERED) |
| 366 | flags |= SEC_SORT_ENTRIES; |
| 367 | |
| 368 | bfd_set_section_flags (abfd, newsect, flags); |
| 369 | return TRUE; |
| 370 | } |
| 371 | \f |
| 372 | /* Set up any other section flags and such that may be necessary. */ |
| 373 | /* XXX hack alert bogus This routine is mostly all junk and almost |
| 374 | certainly does the wrong thing. Its here simply because it does |
| 375 | just enough to allow glibc-2.1 ld.so to compile & link. */ |
| 376 | |
| 377 | static bfd_boolean |
| 378 | i370_elf_fake_sections (bfd *abfd ATTRIBUTE_UNUSED, |
| 379 | Elf_Internal_Shdr *shdr, |
| 380 | asection *asect) |
| 381 | { |
| 382 | if ((asect->flags & (SEC_GROUP | SEC_EXCLUDE)) == SEC_EXCLUDE) |
| 383 | shdr->sh_flags |= SHF_EXCLUDE; |
| 384 | |
| 385 | if ((asect->flags & SEC_SORT_ENTRIES) != 0) |
| 386 | shdr->sh_type = SHT_ORDERED; |
| 387 | |
| 388 | return TRUE; |
| 389 | } |
| 390 | \f |
| 391 | /* We have to create .dynsbss and .rela.sbss here so that they get mapped |
| 392 | to output sections (just like _bfd_elf_create_dynamic_sections has |
| 393 | to create .dynbss and .rela.bss). */ |
| 394 | /* XXX hack alert bogus This routine is mostly all junk and almost |
| 395 | certainly does the wrong thing. Its here simply because it does |
| 396 | just enough to allow glibc-2.1 ld.so to compile & link. */ |
| 397 | |
| 398 | static bfd_boolean |
| 399 | i370_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info) |
| 400 | { |
| 401 | asection *s; |
| 402 | flagword flags; |
| 403 | |
| 404 | if (!_bfd_elf_create_dynamic_sections(abfd, info)) |
| 405 | return FALSE; |
| 406 | |
| 407 | flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY |
| 408 | | SEC_LINKER_CREATED); |
| 409 | |
| 410 | s = bfd_make_section_with_flags (abfd, ".dynsbss", |
| 411 | SEC_ALLOC | SEC_LINKER_CREATED); |
| 412 | if (s == NULL) |
| 413 | return FALSE; |
| 414 | |
| 415 | if (! info->shared) |
| 416 | { |
| 417 | s = bfd_make_section_with_flags (abfd, ".rela.sbss", |
| 418 | flags | SEC_READONLY); |
| 419 | if (s == NULL |
| 420 | || ! bfd_set_section_alignment (abfd, s, 2)) |
| 421 | return FALSE; |
| 422 | } |
| 423 | |
| 424 | /* XXX beats me, seem to need a rela.text ... */ |
| 425 | s = bfd_make_section_with_flags (abfd, ".rela.text", |
| 426 | flags | SEC_READONLY); |
| 427 | if (s == NULL |
| 428 | || ! bfd_set_section_alignment (abfd, s, 2)) |
| 429 | return FALSE; |
| 430 | return TRUE; |
| 431 | } |
| 432 | |
| 433 | /* Adjust a symbol defined by a dynamic object and referenced by a |
| 434 | regular object. The current definition is in some section of the |
| 435 | dynamic object, but we're not including those sections. We have to |
| 436 | change the definition to something the rest of the link can |
| 437 | understand. */ |
| 438 | /* XXX hack alert bogus This routine is mostly all junk and almost |
| 439 | certainly does the wrong thing. Its here simply because it does |
| 440 | just enough to allow glibc-2.1 ld.so to compile & link. */ |
| 441 | |
| 442 | static bfd_boolean |
| 443 | i370_elf_adjust_dynamic_symbol (struct bfd_link_info *info, |
| 444 | struct elf_link_hash_entry *h) |
| 445 | { |
| 446 | bfd *dynobj = elf_hash_table (info)->dynobj; |
| 447 | asection *s; |
| 448 | unsigned int power_of_two; |
| 449 | |
| 450 | #ifdef DEBUG |
| 451 | fprintf (stderr, "i370_elf_adjust_dynamic_symbol called for %s\n", |
| 452 | h->root.root.string); |
| 453 | #endif |
| 454 | |
| 455 | /* Make sure we know what is going on here. */ |
| 456 | BFD_ASSERT (dynobj != NULL |
| 457 | && (h->needs_plt |
| 458 | || h->u.weakdef != NULL |
| 459 | || (h->def_dynamic |
| 460 | && h->ref_regular |
| 461 | && !h->def_regular))); |
| 462 | |
| 463 | s = bfd_get_section_by_name (dynobj, ".rela.text"); |
| 464 | BFD_ASSERT (s != NULL); |
| 465 | s->size += sizeof (Elf32_External_Rela); |
| 466 | |
| 467 | /* If this is a weak symbol, and there is a real definition, the |
| 468 | processor independent code will have arranged for us to see the |
| 469 | real definition first, and we can just use the same value. */ |
| 470 | if (h->u.weakdef != NULL) |
| 471 | { |
| 472 | BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined |
| 473 | || h->u.weakdef->root.type == bfd_link_hash_defweak); |
| 474 | h->root.u.def.section = h->u.weakdef->root.u.def.section; |
| 475 | h->root.u.def.value = h->u.weakdef->root.u.def.value; |
| 476 | return TRUE; |
| 477 | } |
| 478 | |
| 479 | /* This is a reference to a symbol defined by a dynamic object which |
| 480 | is not a function. */ |
| 481 | |
| 482 | /* If we are creating a shared library, we must presume that the |
| 483 | only references to the symbol are via the global offset table. |
| 484 | For such cases we need not do anything here; the relocations will |
| 485 | be handled correctly by relocate_section. */ |
| 486 | if (info->shared) |
| 487 | return TRUE; |
| 488 | |
| 489 | if (h->size == 0) |
| 490 | { |
| 491 | (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"), |
| 492 | h->root.root.string); |
| 493 | return TRUE; |
| 494 | } |
| 495 | |
| 496 | /* We must allocate the symbol in our .dynbss section, which will |
| 497 | become part of the .bss section of the executable. There will be |
| 498 | an entry for this symbol in the .dynsym section. The dynamic |
| 499 | object will contain position independent code, so all references |
| 500 | from the dynamic object to this symbol will go through the global |
| 501 | offset table. The dynamic linker will use the .dynsym entry to |
| 502 | determine the address it must put in the global offset table, so |
| 503 | both the dynamic object and the regular object will refer to the |
| 504 | same memory location for the variable. |
| 505 | |
| 506 | Of course, if the symbol is sufficiently small, we must instead |
| 507 | allocate it in .sbss. FIXME: It would be better to do this if and |
| 508 | only if there were actually SDAREL relocs for that symbol. */ |
| 509 | |
| 510 | if (h->size <= elf_gp_size (dynobj)) |
| 511 | s = bfd_get_section_by_name (dynobj, ".dynsbss"); |
| 512 | else |
| 513 | s = bfd_get_section_by_name (dynobj, ".dynbss"); |
| 514 | BFD_ASSERT (s != NULL); |
| 515 | |
| 516 | /* We must generate a R_I370_COPY reloc to tell the dynamic linker to |
| 517 | copy the initial value out of the dynamic object and into the |
| 518 | runtime process image. We need to remember the offset into the |
| 519 | .rela.bss section we are going to use. */ |
| 520 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) |
| 521 | { |
| 522 | asection *srel; |
| 523 | |
| 524 | if (h->size <= elf_gp_size (dynobj)) |
| 525 | srel = bfd_get_section_by_name (dynobj, ".rela.sbss"); |
| 526 | else |
| 527 | srel = bfd_get_section_by_name (dynobj, ".rela.bss"); |
| 528 | BFD_ASSERT (srel != NULL); |
| 529 | srel->size += sizeof (Elf32_External_Rela); |
| 530 | h->needs_copy = 1; |
| 531 | } |
| 532 | |
| 533 | /* We need to figure out the alignment required for this symbol. I |
| 534 | have no idea how ELF linkers handle this. */ |
| 535 | power_of_two = bfd_log2 (h->size); |
| 536 | if (power_of_two > 4) |
| 537 | power_of_two = 4; |
| 538 | |
| 539 | /* Apply the required alignment. */ |
| 540 | s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two)); |
| 541 | if (power_of_two > bfd_get_section_alignment (dynobj, s)) |
| 542 | { |
| 543 | if (! bfd_set_section_alignment (dynobj, s, power_of_two)) |
| 544 | return FALSE; |
| 545 | } |
| 546 | |
| 547 | /* Define the symbol as being at this point in the section. */ |
| 548 | h->root.u.def.section = s; |
| 549 | h->root.u.def.value = s->size; |
| 550 | |
| 551 | /* Increment the section size to make room for the symbol. */ |
| 552 | s->size += h->size; |
| 553 | |
| 554 | return TRUE; |
| 555 | } |
| 556 | \f |
| 557 | /* Increment the index of a dynamic symbol by a given amount. Called |
| 558 | via elf_link_hash_traverse. */ |
| 559 | /* XXX hack alert bogus This routine is mostly all junk and almost |
| 560 | certainly does the wrong thing. Its here simply because it does |
| 561 | just enough to allow glibc-2.1 ld.so to compile & link. */ |
| 562 | |
| 563 | static bfd_boolean |
| 564 | i370_elf_adjust_dynindx (struct elf_link_hash_entry *h, void * cparg) |
| 565 | { |
| 566 | int *cp = (int *) cparg; |
| 567 | |
| 568 | #ifdef DEBUG |
| 569 | fprintf (stderr, |
| 570 | "i370_elf_adjust_dynindx called, h->dynindx = %ld, *cp = %d\n", |
| 571 | h->dynindx, *cp); |
| 572 | #endif |
| 573 | |
| 574 | if (h->root.type == bfd_link_hash_warning) |
| 575 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 576 | |
| 577 | if (h->dynindx != -1) |
| 578 | h->dynindx += *cp; |
| 579 | |
| 580 | return TRUE; |
| 581 | } |
| 582 | \f |
| 583 | /* Set the sizes of the dynamic sections. */ |
| 584 | /* XXX hack alert bogus This routine is mostly all junk and almost |
| 585 | certainly does the wrong thing. Its here simply because it does |
| 586 | just enough to allow glibc-2.1 ld.so to compile & link. */ |
| 587 | |
| 588 | static bfd_boolean |
| 589 | i370_elf_size_dynamic_sections (bfd *output_bfd, |
| 590 | struct bfd_link_info *info) |
| 591 | { |
| 592 | bfd *dynobj; |
| 593 | asection *s; |
| 594 | bfd_boolean plt; |
| 595 | bfd_boolean relocs; |
| 596 | bfd_boolean reltext; |
| 597 | |
| 598 | #ifdef DEBUG |
| 599 | fprintf (stderr, "i370_elf_size_dynamic_sections called\n"); |
| 600 | #endif |
| 601 | |
| 602 | dynobj = elf_hash_table (info)->dynobj; |
| 603 | BFD_ASSERT (dynobj != NULL); |
| 604 | |
| 605 | if (elf_hash_table (info)->dynamic_sections_created) |
| 606 | { |
| 607 | /* Set the contents of the .interp section to the interpreter. */ |
| 608 | if (info->executable) |
| 609 | { |
| 610 | s = bfd_get_section_by_name (dynobj, ".interp"); |
| 611 | BFD_ASSERT (s != NULL); |
| 612 | s->size = sizeof ELF_DYNAMIC_INTERPRETER; |
| 613 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; |
| 614 | } |
| 615 | } |
| 616 | else |
| 617 | { |
| 618 | /* We may have created entries in the .rela.got, .rela.sdata, and |
| 619 | .rela.sdata2 sections. However, if we are not creating the |
| 620 | dynamic sections, we will not actually use these entries. Reset |
| 621 | the size of .rela.got, et al, which will cause it to get |
| 622 | stripped from the output file below. */ |
| 623 | static char *rela_sections[] = { ".rela.got", ".rela.sdata", |
| 624 | ".rela.sdata2", ".rela.sbss", |
| 625 | NULL }; |
| 626 | char **p; |
| 627 | |
| 628 | for (p = rela_sections; *p != NULL; p++) |
| 629 | { |
| 630 | s = bfd_get_section_by_name (dynobj, *p); |
| 631 | if (s != NULL) |
| 632 | s->size = 0; |
| 633 | } |
| 634 | } |
| 635 | |
| 636 | /* The check_relocs and adjust_dynamic_symbol entry points have |
| 637 | determined the sizes of the various dynamic sections. Allocate |
| 638 | memory for them. */ |
| 639 | plt = FALSE; |
| 640 | relocs = FALSE; |
| 641 | reltext = FALSE; |
| 642 | for (s = dynobj->sections; s != NULL; s = s->next) |
| 643 | { |
| 644 | const char *name; |
| 645 | |
| 646 | if ((s->flags & SEC_LINKER_CREATED) == 0) |
| 647 | continue; |
| 648 | |
| 649 | /* It's OK to base decisions on the section name, because none |
| 650 | of the dynobj section names depend upon the input files. */ |
| 651 | name = bfd_get_section_name (dynobj, s); |
| 652 | |
| 653 | if (strcmp (name, ".plt") == 0) |
| 654 | { |
| 655 | /* Remember whether there is a PLT. */ |
| 656 | plt = s->size != 0; |
| 657 | } |
| 658 | else if (CONST_STRNEQ (name, ".rela")) |
| 659 | { |
| 660 | if (s->size != 0) |
| 661 | { |
| 662 | asection *target; |
| 663 | const char *outname; |
| 664 | |
| 665 | /* Remember whether there are any relocation sections. */ |
| 666 | relocs = TRUE; |
| 667 | |
| 668 | /* If this relocation section applies to a read only |
| 669 | section, then we probably need a DT_TEXTREL entry. */ |
| 670 | outname = bfd_get_section_name (output_bfd, |
| 671 | s->output_section); |
| 672 | target = bfd_get_section_by_name (output_bfd, outname + 5); |
| 673 | if (target != NULL |
| 674 | && (target->flags & SEC_READONLY) != 0 |
| 675 | && (target->flags & SEC_ALLOC) != 0) |
| 676 | reltext = TRUE; |
| 677 | |
| 678 | /* We use the reloc_count field as a counter if we need |
| 679 | to copy relocs into the output file. */ |
| 680 | s->reloc_count = 0; |
| 681 | } |
| 682 | } |
| 683 | else if (strcmp (name, ".got") != 0 |
| 684 | && strcmp (name, ".sdata") != 0 |
| 685 | && strcmp (name, ".sdata2") != 0 |
| 686 | && strcmp (name, ".dynbss") != 0 |
| 687 | && strcmp (name, ".dynsbss") != 0) |
| 688 | { |
| 689 | /* It's not one of our sections, so don't allocate space. */ |
| 690 | continue; |
| 691 | } |
| 692 | |
| 693 | if (s->size == 0) |
| 694 | { |
| 695 | /* If we don't need this section, strip it from the |
| 696 | output file. This is mostly to handle .rela.bss and |
| 697 | .rela.plt. We must create both sections in |
| 698 | create_dynamic_sections, because they must be created |
| 699 | before the linker maps input sections to output |
| 700 | sections. The linker does that before |
| 701 | adjust_dynamic_symbol is called, and it is that |
| 702 | function which decides whether anything needs to go |
| 703 | into these sections. */ |
| 704 | s->flags |= SEC_EXCLUDE; |
| 705 | continue; |
| 706 | } |
| 707 | |
| 708 | if ((s->flags & SEC_HAS_CONTENTS) == 0) |
| 709 | continue; |
| 710 | |
| 711 | /* Allocate memory for the section contents. */ |
| 712 | s->contents = bfd_zalloc (dynobj, s->size); |
| 713 | if (s->contents == NULL) |
| 714 | return FALSE; |
| 715 | } |
| 716 | |
| 717 | if (elf_hash_table (info)->dynamic_sections_created) |
| 718 | { |
| 719 | /* Add some entries to the .dynamic section. We fill in the |
| 720 | values later, in i370_elf_finish_dynamic_sections, but we |
| 721 | must add the entries now so that we get the correct size for |
| 722 | the .dynamic section. The DT_DEBUG entry is filled in by the |
| 723 | dynamic linker and used by the debugger. */ |
| 724 | #define add_dynamic_entry(TAG, VAL) \ |
| 725 | _bfd_elf_add_dynamic_entry (info, TAG, VAL) |
| 726 | |
| 727 | if (!info->shared) |
| 728 | { |
| 729 | if (!add_dynamic_entry (DT_DEBUG, 0)) |
| 730 | return FALSE; |
| 731 | } |
| 732 | |
| 733 | if (plt) |
| 734 | { |
| 735 | if (!add_dynamic_entry (DT_PLTGOT, 0) |
| 736 | || !add_dynamic_entry (DT_PLTRELSZ, 0) |
| 737 | || !add_dynamic_entry (DT_PLTREL, DT_RELA) |
| 738 | || !add_dynamic_entry (DT_JMPREL, 0)) |
| 739 | return FALSE; |
| 740 | } |
| 741 | |
| 742 | if (relocs) |
| 743 | { |
| 744 | if (!add_dynamic_entry (DT_RELA, 0) |
| 745 | || !add_dynamic_entry (DT_RELASZ, 0) |
| 746 | || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela))) |
| 747 | return FALSE; |
| 748 | } |
| 749 | |
| 750 | if (reltext) |
| 751 | { |
| 752 | if (!add_dynamic_entry (DT_TEXTREL, 0)) |
| 753 | return FALSE; |
| 754 | info->flags |= DF_TEXTREL; |
| 755 | } |
| 756 | } |
| 757 | #undef add_dynamic_entry |
| 758 | |
| 759 | /* If we are generating a shared library, we generate a section |
| 760 | symbol for each output section. These are local symbols, which |
| 761 | means that they must come first in the dynamic symbol table. |
| 762 | That means we must increment the dynamic symbol index of every |
| 763 | other dynamic symbol. |
| 764 | |
| 765 | FIXME: We assume that there will never be relocations to |
| 766 | locations in linker-created sections that do not have |
| 767 | externally-visible names. Instead, we should work out precisely |
| 768 | which sections relocations are targeted at. */ |
| 769 | if (info->shared) |
| 770 | { |
| 771 | int c; |
| 772 | |
| 773 | for (c = 0, s = output_bfd->sections; s != NULL; s = s->next) |
| 774 | { |
| 775 | if ((s->flags & SEC_LINKER_CREATED) != 0 |
| 776 | || (s->flags & SEC_ALLOC) == 0) |
| 777 | { |
| 778 | elf_section_data (s)->dynindx = -1; |
| 779 | continue; |
| 780 | } |
| 781 | |
| 782 | /* These symbols will have no names, so we don't need to |
| 783 | fiddle with dynstr_index. */ |
| 784 | |
| 785 | elf_section_data (s)->dynindx = c + 1; |
| 786 | |
| 787 | c++; |
| 788 | } |
| 789 | |
| 790 | elf_link_hash_traverse (elf_hash_table (info), |
| 791 | i370_elf_adjust_dynindx, & c); |
| 792 | elf_hash_table (info)->dynsymcount += c; |
| 793 | } |
| 794 | |
| 795 | return TRUE; |
| 796 | } |
| 797 | \f |
| 798 | /* Look through the relocs for a section during the first phase, and |
| 799 | allocate space in the global offset table or procedure linkage |
| 800 | table. */ |
| 801 | /* XXX hack alert bogus This routine is mostly all junk and almost |
| 802 | certainly does the wrong thing. Its here simply because it does |
| 803 | just enough to allow glibc-2.1 ld.so to compile & link. */ |
| 804 | |
| 805 | static bfd_boolean |
| 806 | i370_elf_check_relocs (bfd *abfd, |
| 807 | struct bfd_link_info *info, |
| 808 | asection *sec, |
| 809 | const Elf_Internal_Rela *relocs) |
| 810 | { |
| 811 | bfd *dynobj; |
| 812 | Elf_Internal_Shdr *symtab_hdr; |
| 813 | struct elf_link_hash_entry **sym_hashes; |
| 814 | const Elf_Internal_Rela *rel; |
| 815 | const Elf_Internal_Rela *rel_end; |
| 816 | bfd_vma *local_got_offsets; |
| 817 | asection *sreloc; |
| 818 | |
| 819 | if (info->relocatable) |
| 820 | return TRUE; |
| 821 | |
| 822 | #ifdef DEBUG |
| 823 | _bfd_error_handler ("i370_elf_check_relocs called for section %A in %B", |
| 824 | sec, abfd); |
| 825 | #endif |
| 826 | |
| 827 | dynobj = elf_hash_table (info)->dynobj; |
| 828 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 829 | sym_hashes = elf_sym_hashes (abfd); |
| 830 | local_got_offsets = elf_local_got_offsets (abfd); |
| 831 | |
| 832 | sreloc = NULL; |
| 833 | |
| 834 | rel_end = relocs + sec->reloc_count; |
| 835 | for (rel = relocs; rel < rel_end; rel++) |
| 836 | { |
| 837 | unsigned long r_symndx; |
| 838 | struct elf_link_hash_entry *h; |
| 839 | |
| 840 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 841 | if (r_symndx < symtab_hdr->sh_info) |
| 842 | h = NULL; |
| 843 | else |
| 844 | { |
| 845 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 846 | while (h->root.type == bfd_link_hash_indirect |
| 847 | || h->root.type == bfd_link_hash_warning) |
| 848 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 849 | } |
| 850 | |
| 851 | if (info->shared) |
| 852 | { |
| 853 | #ifdef DEBUG |
| 854 | fprintf (stderr, |
| 855 | "i370_elf_check_relocs needs to create relocation for %s\n", |
| 856 | (h && h->root.root.string) |
| 857 | ? h->root.root.string : "<unknown>"); |
| 858 | #endif |
| 859 | if (sreloc == NULL) |
| 860 | { |
| 861 | const char *name; |
| 862 | |
| 863 | name = (bfd_elf_string_from_elf_section |
| 864 | (abfd, |
| 865 | elf_elfheader (abfd)->e_shstrndx, |
| 866 | elf_section_data (sec)->rel_hdr.sh_name)); |
| 867 | if (name == NULL) |
| 868 | return FALSE; |
| 869 | |
| 870 | BFD_ASSERT (CONST_STRNEQ (name, ".rela") |
| 871 | && strcmp (bfd_get_section_name (abfd, sec), name + 5) == 0); |
| 872 | |
| 873 | sreloc = bfd_get_section_by_name (dynobj, name); |
| 874 | if (sreloc == NULL) |
| 875 | { |
| 876 | flagword flags; |
| 877 | |
| 878 | flags = (SEC_HAS_CONTENTS | SEC_READONLY |
| 879 | | SEC_IN_MEMORY | SEC_LINKER_CREATED); |
| 880 | if ((sec->flags & SEC_ALLOC) != 0) |
| 881 | flags |= SEC_ALLOC | SEC_LOAD; |
| 882 | sreloc = bfd_make_section_with_flags (dynobj, name, |
| 883 | flags); |
| 884 | if (sreloc == NULL |
| 885 | || ! bfd_set_section_alignment (dynobj, sreloc, 2)) |
| 886 | return FALSE; |
| 887 | } |
| 888 | } |
| 889 | |
| 890 | sreloc->size += sizeof (Elf32_External_Rela); |
| 891 | |
| 892 | /* FIXME: We should here do what the m68k and i386 |
| 893 | backends do: if the reloc is pc-relative, record it |
| 894 | in case it turns out that the reloc is unnecessary |
| 895 | because the symbol is forced local by versioning or |
| 896 | we are linking with -Bdynamic. Fortunately this |
| 897 | case is not frequent. */ |
| 898 | } |
| 899 | } |
| 900 | |
| 901 | return TRUE; |
| 902 | } |
| 903 | \f |
| 904 | /* Finish up the dynamic sections. */ |
| 905 | /* XXX hack alert bogus This routine is mostly all junk and almost |
| 906 | certainly does the wrong thing. Its here simply because it does |
| 907 | just enough to allow glibc-2.1 ld.so to compile & link. */ |
| 908 | |
| 909 | static bfd_boolean |
| 910 | i370_elf_finish_dynamic_sections (bfd *output_bfd, |
| 911 | struct bfd_link_info *info) |
| 912 | { |
| 913 | asection *sdyn; |
| 914 | bfd *dynobj = elf_hash_table (info)->dynobj; |
| 915 | asection *sgot = bfd_get_section_by_name (dynobj, ".got"); |
| 916 | |
| 917 | #ifdef DEBUG |
| 918 | fprintf (stderr, "i370_elf_finish_dynamic_sections called\n"); |
| 919 | #endif |
| 920 | |
| 921 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); |
| 922 | |
| 923 | if (elf_hash_table (info)->dynamic_sections_created) |
| 924 | { |
| 925 | asection *splt; |
| 926 | Elf32_External_Dyn *dyncon, *dynconend; |
| 927 | |
| 928 | splt = bfd_get_section_by_name (dynobj, ".plt"); |
| 929 | BFD_ASSERT (splt != NULL && sdyn != NULL); |
| 930 | |
| 931 | dyncon = (Elf32_External_Dyn *) sdyn->contents; |
| 932 | dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); |
| 933 | for (; dyncon < dynconend; dyncon++) |
| 934 | { |
| 935 | Elf_Internal_Dyn dyn; |
| 936 | const char *name; |
| 937 | bfd_boolean size; |
| 938 | |
| 939 | bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); |
| 940 | |
| 941 | switch (dyn.d_tag) |
| 942 | { |
| 943 | case DT_PLTGOT: name = ".plt"; size = FALSE; break; |
| 944 | case DT_PLTRELSZ: name = ".rela.plt"; size = TRUE; break; |
| 945 | case DT_JMPREL: name = ".rela.plt"; size = FALSE; break; |
| 946 | default: name = NULL; size = FALSE; break; |
| 947 | } |
| 948 | |
| 949 | if (name != NULL) |
| 950 | { |
| 951 | asection *s; |
| 952 | |
| 953 | s = bfd_get_section_by_name (output_bfd, name); |
| 954 | if (s == NULL) |
| 955 | dyn.d_un.d_val = 0; |
| 956 | else |
| 957 | { |
| 958 | if (! size) |
| 959 | dyn.d_un.d_ptr = s->vma; |
| 960 | else |
| 961 | dyn.d_un.d_val = s->size; |
| 962 | } |
| 963 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 964 | } |
| 965 | } |
| 966 | } |
| 967 | |
| 968 | if (sgot && sgot->size != 0) |
| 969 | { |
| 970 | unsigned char *contents = sgot->contents; |
| 971 | |
| 972 | if (sdyn == NULL) |
| 973 | bfd_put_32 (output_bfd, (bfd_vma) 0, contents); |
| 974 | else |
| 975 | bfd_put_32 (output_bfd, |
| 976 | sdyn->output_section->vma + sdyn->output_offset, |
| 977 | contents); |
| 978 | |
| 979 | elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; |
| 980 | } |
| 981 | |
| 982 | if (info->shared) |
| 983 | { |
| 984 | asection *sdynsym; |
| 985 | asection *s; |
| 986 | Elf_Internal_Sym sym; |
| 987 | int maxdindx = 0; |
| 988 | |
| 989 | /* Set up the section symbols for the output sections. */ |
| 990 | |
| 991 | sdynsym = bfd_get_section_by_name (dynobj, ".dynsym"); |
| 992 | BFD_ASSERT (sdynsym != NULL); |
| 993 | |
| 994 | sym.st_size = 0; |
| 995 | sym.st_name = 0; |
| 996 | sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION); |
| 997 | sym.st_other = 0; |
| 998 | |
| 999 | for (s = output_bfd->sections; s != NULL; s = s->next) |
| 1000 | { |
| 1001 | int indx, dindx; |
| 1002 | Elf32_External_Sym *esym; |
| 1003 | |
| 1004 | sym.st_value = s->vma; |
| 1005 | |
| 1006 | indx = elf_section_data (s)->this_idx; |
| 1007 | dindx = elf_section_data (s)->dynindx; |
| 1008 | if (dindx != -1) |
| 1009 | { |
| 1010 | BFD_ASSERT(indx > 0); |
| 1011 | BFD_ASSERT(dindx > 0); |
| 1012 | |
| 1013 | if (dindx > maxdindx) |
| 1014 | maxdindx = dindx; |
| 1015 | |
| 1016 | sym.st_shndx = indx; |
| 1017 | |
| 1018 | esym = (Elf32_External_Sym *) sdynsym->contents + dindx; |
| 1019 | bfd_elf32_swap_symbol_out (output_bfd, &sym, esym, NULL); |
| 1020 | } |
| 1021 | } |
| 1022 | |
| 1023 | /* Set the sh_info field of the output .dynsym section to the |
| 1024 | index of the first global symbol. */ |
| 1025 | elf_section_data (sdynsym->output_section)->this_hdr.sh_info = |
| 1026 | maxdindx + 1; |
| 1027 | } |
| 1028 | |
| 1029 | return TRUE; |
| 1030 | } |
| 1031 | \f |
| 1032 | /* The RELOCATE_SECTION function is called by the ELF backend linker |
| 1033 | to handle the relocations for a section. |
| 1034 | |
| 1035 | The relocs are always passed as Rela structures; if the section |
| 1036 | actually uses Rel structures, the r_addend field will always be |
| 1037 | zero. |
| 1038 | |
| 1039 | This function is responsible for adjust the section contents as |
| 1040 | necessary, and (if using Rela relocs and generating a |
| 1041 | relocatable output file) adjusting the reloc addend as |
| 1042 | necessary. |
| 1043 | |
| 1044 | This function does not have to worry about setting the reloc |
| 1045 | address or the reloc symbol index. |
| 1046 | |
| 1047 | LOCAL_SYMS is a pointer to the swapped in local symbols. |
| 1048 | |
| 1049 | LOCAL_SECTIONS is an array giving the section in the input file |
| 1050 | corresponding to the st_shndx field of each local symbol. |
| 1051 | |
| 1052 | The global hash table entry for the global symbols can be found |
| 1053 | via elf_sym_hashes (input_bfd). |
| 1054 | |
| 1055 | When generating relocatable output, this function must handle |
| 1056 | STB_LOCAL/STT_SECTION symbols specially. The output symbol is |
| 1057 | going to be the section symbol corresponding to the output |
| 1058 | section, which means that the addend must be adjusted |
| 1059 | accordingly. */ |
| 1060 | |
| 1061 | static bfd_boolean |
| 1062 | i370_elf_relocate_section (bfd *output_bfd, |
| 1063 | struct bfd_link_info *info, |
| 1064 | bfd *input_bfd, |
| 1065 | asection *input_section, |
| 1066 | bfd_byte *contents, |
| 1067 | Elf_Internal_Rela *relocs, |
| 1068 | Elf_Internal_Sym *local_syms, |
| 1069 | asection **local_sections) |
| 1070 | { |
| 1071 | Elf_Internal_Shdr *symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 1072 | struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (input_bfd); |
| 1073 | bfd *dynobj = elf_hash_table (info)->dynobj; |
| 1074 | Elf_Internal_Rela *rel = relocs; |
| 1075 | Elf_Internal_Rela *relend = relocs + input_section->reloc_count; |
| 1076 | asection *sreloc = NULL; |
| 1077 | bfd_vma *local_got_offsets; |
| 1078 | bfd_boolean ret = TRUE; |
| 1079 | |
| 1080 | if (info->relocatable) |
| 1081 | return TRUE; |
| 1082 | |
| 1083 | #ifdef DEBUG |
| 1084 | _bfd_error_handler ("i370_elf_relocate_section called for %B section %A, %ld relocations%s", |
| 1085 | input_bfd, input_section, |
| 1086 | (long) input_section->reloc_count, |
| 1087 | (info->relocatable) ? " (relocatable)" : ""); |
| 1088 | #endif |
| 1089 | |
| 1090 | if (!i370_elf_howto_table[ R_I370_ADDR31 ]) |
| 1091 | /* Initialize howto table if needed. */ |
| 1092 | i370_elf_howto_init (); |
| 1093 | |
| 1094 | local_got_offsets = elf_local_got_offsets (input_bfd); |
| 1095 | |
| 1096 | for (; rel < relend; rel++) |
| 1097 | { |
| 1098 | enum i370_reloc_type r_type = (enum i370_reloc_type) ELF32_R_TYPE (rel->r_info); |
| 1099 | bfd_vma offset = rel->r_offset; |
| 1100 | bfd_vma addend = rel->r_addend; |
| 1101 | bfd_reloc_status_type r = bfd_reloc_other; |
| 1102 | Elf_Internal_Sym *sym = NULL; |
| 1103 | asection *sec = NULL; |
| 1104 | struct elf_link_hash_entry * h = NULL; |
| 1105 | const char *sym_name = NULL; |
| 1106 | reloc_howto_type *howto; |
| 1107 | unsigned long r_symndx; |
| 1108 | bfd_vma relocation; |
| 1109 | |
| 1110 | /* Unknown relocation handling. */ |
| 1111 | if ((unsigned) r_type >= (unsigned) R_I370_max |
| 1112 | || !i370_elf_howto_table[(int)r_type]) |
| 1113 | { |
| 1114 | (*_bfd_error_handler) ("%B: unknown relocation type %d", |
| 1115 | input_bfd, |
| 1116 | (int) r_type); |
| 1117 | |
| 1118 | bfd_set_error (bfd_error_bad_value); |
| 1119 | ret = FALSE; |
| 1120 | continue; |
| 1121 | } |
| 1122 | |
| 1123 | howto = i370_elf_howto_table[(int) r_type]; |
| 1124 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 1125 | |
| 1126 | if (r_symndx < symtab_hdr->sh_info) |
| 1127 | { |
| 1128 | sym = local_syms + r_symndx; |
| 1129 | sec = local_sections[r_symndx]; |
| 1130 | sym_name = "<local symbol>"; |
| 1131 | |
| 1132 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, & sec, rel); |
| 1133 | addend = rel->r_addend; |
| 1134 | } |
| 1135 | else |
| 1136 | { |
| 1137 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 1138 | while (h->root.type == bfd_link_hash_indirect |
| 1139 | || h->root.type == bfd_link_hash_warning) |
| 1140 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1141 | sym_name = h->root.root.string; |
| 1142 | if (h->root.type == bfd_link_hash_defined |
| 1143 | || h->root.type == bfd_link_hash_defweak) |
| 1144 | { |
| 1145 | sec = h->root.u.def.section; |
| 1146 | if (info->shared |
| 1147 | && ((! info->symbolic && h->dynindx != -1) |
| 1148 | || !h->def_regular) |
| 1149 | && (input_section->flags & SEC_ALLOC) != 0 |
| 1150 | && (r_type == R_I370_ADDR31 |
| 1151 | || r_type == R_I370_COPY |
| 1152 | || r_type == R_I370_ADDR16 |
| 1153 | || r_type == R_I370_RELATIVE)) |
| 1154 | /* In these cases, we don't need the relocation |
| 1155 | value. We check specially because in some |
| 1156 | obscure cases sec->output_section will be NULL. */ |
| 1157 | relocation = 0; |
| 1158 | else |
| 1159 | relocation = (h->root.u.def.value |
| 1160 | + sec->output_section->vma |
| 1161 | + sec->output_offset); |
| 1162 | } |
| 1163 | else if (h->root.type == bfd_link_hash_undefweak) |
| 1164 | relocation = 0; |
| 1165 | else if (info->unresolved_syms_in_objects == RM_IGNORE |
| 1166 | && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) |
| 1167 | relocation = 0; |
| 1168 | else |
| 1169 | { |
| 1170 | if ((*info->callbacks->undefined_symbol) |
| 1171 | (info, h->root.root.string, input_bfd, |
| 1172 | input_section, rel->r_offset, |
| 1173 | (info->unresolved_syms_in_objects == RM_GENERATE_ERROR |
| 1174 | || ELF_ST_VISIBILITY (h->other)))) |
| 1175 | { |
| 1176 | ret = FALSE; |
| 1177 | continue; |
| 1178 | } |
| 1179 | relocation = 0; |
| 1180 | } |
| 1181 | } |
| 1182 | |
| 1183 | switch ((int) r_type) |
| 1184 | { |
| 1185 | default: |
| 1186 | (*_bfd_error_handler) |
| 1187 | ("%B: unknown relocation type %d for symbol %s", |
| 1188 | input_bfd, (int) r_type, sym_name); |
| 1189 | |
| 1190 | bfd_set_error (bfd_error_bad_value); |
| 1191 | ret = FALSE; |
| 1192 | continue; |
| 1193 | |
| 1194 | case (int) R_I370_NONE: |
| 1195 | continue; |
| 1196 | |
| 1197 | /* Relocations that may need to be propagated if this is a shared |
| 1198 | object. */ |
| 1199 | case (int) R_I370_REL31: |
| 1200 | /* If these relocations are not to a named symbol, they can be |
| 1201 | handled right here, no need to bother the dynamic linker. */ |
| 1202 | if (h == NULL |
| 1203 | || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) |
| 1204 | break; |
| 1205 | /* Fall through. */ |
| 1206 | |
| 1207 | /* Relocations that always need to be propagated if this is a shared |
| 1208 | object. */ |
| 1209 | case (int) R_I370_ADDR31: |
| 1210 | case (int) R_I370_ADDR16: |
| 1211 | if (info->shared |
| 1212 | && r_symndx != 0) |
| 1213 | { |
| 1214 | Elf_Internal_Rela outrel; |
| 1215 | bfd_byte *loc; |
| 1216 | int skip; |
| 1217 | |
| 1218 | #ifdef DEBUG |
| 1219 | fprintf (stderr, |
| 1220 | "i370_elf_relocate_section needs to create relocation for %s\n", |
| 1221 | (h && h->root.root.string) ? h->root.root.string : "<unknown>"); |
| 1222 | #endif |
| 1223 | |
| 1224 | /* When generating a shared object, these relocations |
| 1225 | are copied into the output file to be resolved at run |
| 1226 | time. */ |
| 1227 | |
| 1228 | if (sreloc == NULL) |
| 1229 | { |
| 1230 | const char *name; |
| 1231 | |
| 1232 | name = (bfd_elf_string_from_elf_section |
| 1233 | (input_bfd, |
| 1234 | elf_elfheader (input_bfd)->e_shstrndx, |
| 1235 | elf_section_data (input_section)->rel_hdr.sh_name)); |
| 1236 | if (name == NULL) |
| 1237 | return FALSE; |
| 1238 | |
| 1239 | BFD_ASSERT (CONST_STRNEQ (name, ".rela") |
| 1240 | && strcmp (bfd_get_section_name (input_bfd, |
| 1241 | input_section), |
| 1242 | name + 5) == 0); |
| 1243 | |
| 1244 | sreloc = bfd_get_section_by_name (dynobj, name); |
| 1245 | BFD_ASSERT (sreloc != NULL); |
| 1246 | } |
| 1247 | |
| 1248 | skip = 0; |
| 1249 | |
| 1250 | outrel.r_offset = |
| 1251 | _bfd_elf_section_offset (output_bfd, info, input_section, |
| 1252 | rel->r_offset); |
| 1253 | if (outrel.r_offset == (bfd_vma) -1 |
| 1254 | || outrel.r_offset == (bfd_vma) -2) |
| 1255 | skip = (int) outrel.r_offset; |
| 1256 | outrel.r_offset += (input_section->output_section->vma |
| 1257 | + input_section->output_offset); |
| 1258 | |
| 1259 | if (skip) |
| 1260 | memset (&outrel, 0, sizeof outrel); |
| 1261 | /* h->dynindx may be -1 if this symbol was marked to |
| 1262 | become local. */ |
| 1263 | else if (h != NULL |
| 1264 | && ((! info->symbolic && h->dynindx != -1) |
| 1265 | || !h->def_regular)) |
| 1266 | { |
| 1267 | BFD_ASSERT (h->dynindx != -1); |
| 1268 | outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); |
| 1269 | outrel.r_addend = rel->r_addend; |
| 1270 | } |
| 1271 | else |
| 1272 | { |
| 1273 | if (r_type == R_I370_ADDR31) |
| 1274 | { |
| 1275 | outrel.r_info = ELF32_R_INFO (0, R_I370_RELATIVE); |
| 1276 | outrel.r_addend = relocation + rel->r_addend; |
| 1277 | } |
| 1278 | else |
| 1279 | { |
| 1280 | long indx; |
| 1281 | |
| 1282 | if (bfd_is_abs_section (sec)) |
| 1283 | indx = 0; |
| 1284 | else if (sec == NULL || sec->owner == NULL) |
| 1285 | { |
| 1286 | bfd_set_error (bfd_error_bad_value); |
| 1287 | return FALSE; |
| 1288 | } |
| 1289 | else |
| 1290 | { |
| 1291 | asection *osec; |
| 1292 | |
| 1293 | osec = sec->output_section; |
| 1294 | indx = elf_section_data (osec)->dynindx; |
| 1295 | BFD_ASSERT(indx > 0); |
| 1296 | #ifdef DEBUG |
| 1297 | if (indx <= 0) |
| 1298 | { |
| 1299 | printf ("indx=%ld section=%s flags=%08x name=%s\n", |
| 1300 | indx, osec->name, osec->flags, |
| 1301 | h->root.root.string); |
| 1302 | } |
| 1303 | #endif |
| 1304 | } |
| 1305 | |
| 1306 | outrel.r_info = ELF32_R_INFO (indx, r_type); |
| 1307 | outrel.r_addend = relocation + rel->r_addend; |
| 1308 | } |
| 1309 | } |
| 1310 | |
| 1311 | loc = sreloc->contents; |
| 1312 | loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); |
| 1313 | bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); |
| 1314 | |
| 1315 | /* This reloc will be computed at runtime, so there's no |
| 1316 | need to do anything now, unless this is a RELATIVE |
| 1317 | reloc in an unallocated section. */ |
| 1318 | if (skip == -1 |
| 1319 | || (input_section->flags & SEC_ALLOC) != 0 |
| 1320 | || ELF32_R_TYPE (outrel.r_info) != R_I370_RELATIVE) |
| 1321 | continue; |
| 1322 | } |
| 1323 | break; |
| 1324 | |
| 1325 | case (int) R_I370_COPY: |
| 1326 | case (int) R_I370_RELATIVE: |
| 1327 | (*_bfd_error_handler) |
| 1328 | ("%B: Relocation %s is not yet supported for symbol %s.", |
| 1329 | input_bfd, |
| 1330 | i370_elf_howto_table[(int) r_type]->name, |
| 1331 | sym_name); |
| 1332 | |
| 1333 | bfd_set_error (bfd_error_invalid_operation); |
| 1334 | ret = FALSE; |
| 1335 | continue; |
| 1336 | } |
| 1337 | |
| 1338 | #ifdef DEBUG |
| 1339 | fprintf (stderr, "\ttype = %s (%d), name = %s, symbol index = %ld, offset = %ld, addend = %ld\n", |
| 1340 | howto->name, |
| 1341 | (int)r_type, |
| 1342 | sym_name, |
| 1343 | r_symndx, |
| 1344 | (long) offset, |
| 1345 | (long) addend); |
| 1346 | #endif |
| 1347 | |
| 1348 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, contents, |
| 1349 | offset, relocation, addend); |
| 1350 | |
| 1351 | if (r != bfd_reloc_ok) |
| 1352 | { |
| 1353 | ret = FALSE; |
| 1354 | switch (r) |
| 1355 | { |
| 1356 | default: |
| 1357 | break; |
| 1358 | |
| 1359 | case bfd_reloc_overflow: |
| 1360 | { |
| 1361 | const char *name; |
| 1362 | |
| 1363 | if (h != NULL) |
| 1364 | name = NULL; |
| 1365 | else |
| 1366 | { |
| 1367 | name = bfd_elf_string_from_elf_section (input_bfd, |
| 1368 | symtab_hdr->sh_link, |
| 1369 | sym->st_name); |
| 1370 | if (name == NULL) |
| 1371 | break; |
| 1372 | |
| 1373 | if (*name == '\0') |
| 1374 | name = bfd_section_name (input_bfd, sec); |
| 1375 | } |
| 1376 | |
| 1377 | (*info->callbacks->reloc_overflow) (info, |
| 1378 | (h ? &h->root : NULL), |
| 1379 | name, |
| 1380 | howto->name, |
| 1381 | (bfd_vma) 0, |
| 1382 | input_bfd, |
| 1383 | input_section, |
| 1384 | offset); |
| 1385 | } |
| 1386 | break; |
| 1387 | } |
| 1388 | } |
| 1389 | } |
| 1390 | |
| 1391 | #ifdef DEBUG |
| 1392 | fprintf (stderr, "\n"); |
| 1393 | #endif |
| 1394 | |
| 1395 | return ret; |
| 1396 | } |
| 1397 | |
| 1398 | static void |
| 1399 | i370_elf_post_process_headers (bfd * abfd, |
| 1400 | struct bfd_link_info * link_info ATTRIBUTE_UNUSED) |
| 1401 | { |
| 1402 | Elf_Internal_Ehdr * i_ehdrp; /* Elf file header, internal form. */ |
| 1403 | |
| 1404 | i_ehdrp = elf_elfheader (abfd); |
| 1405 | i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_LINUX; |
| 1406 | } |
| 1407 | \f |
| 1408 | #define TARGET_BIG_SYM bfd_elf32_i370_vec |
| 1409 | #define TARGET_BIG_NAME "elf32-i370" |
| 1410 | #define ELF_ARCH bfd_arch_i370 |
| 1411 | #define ELF_MACHINE_CODE EM_S370 |
| 1412 | #ifdef EM_I370_OLD |
| 1413 | #define ELF_MACHINE_ALT1 EM_I370_OLD |
| 1414 | #endif |
| 1415 | #define ELF_MAXPAGESIZE 0x1000 |
| 1416 | #define elf_info_to_howto i370_elf_info_to_howto |
| 1417 | |
| 1418 | #define elf_backend_plt_not_loaded 1 |
| 1419 | #define elf_backend_rela_normal 1 |
| 1420 | |
| 1421 | #define bfd_elf32_bfd_reloc_type_lookup i370_elf_reloc_type_lookup |
| 1422 | #define bfd_elf32_bfd_set_private_flags i370_elf_set_private_flags |
| 1423 | #define bfd_elf32_bfd_merge_private_bfd_data i370_elf_merge_private_bfd_data |
| 1424 | #define elf_backend_relocate_section i370_elf_relocate_section |
| 1425 | |
| 1426 | /* Dynamic loader support is mostly broken; just enough here to be able to |
| 1427 | link glibc's ld.so without errors. */ |
| 1428 | #define elf_backend_create_dynamic_sections i370_elf_create_dynamic_sections |
| 1429 | #define elf_backend_size_dynamic_sections i370_elf_size_dynamic_sections |
| 1430 | #define elf_backend_finish_dynamic_sections i370_elf_finish_dynamic_sections |
| 1431 | #define elf_backend_fake_sections i370_elf_fake_sections |
| 1432 | #define elf_backend_section_from_shdr i370_elf_section_from_shdr |
| 1433 | #define elf_backend_adjust_dynamic_symbol i370_elf_adjust_dynamic_symbol |
| 1434 | #define elf_backend_check_relocs i370_elf_check_relocs |
| 1435 | #define elf_backend_post_process_headers i370_elf_post_process_headers |
| 1436 | |
| 1437 | static int |
| 1438 | i370_noop (void) |
| 1439 | { |
| 1440 | return 1; |
| 1441 | } |
| 1442 | |
| 1443 | #define elf_backend_finish_dynamic_symbol \ |
| 1444 | (bfd_boolean (*) \ |
| 1445 | (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, \ |
| 1446 | Elf_Internal_Sym *)) i370_noop |
| 1447 | |
| 1448 | #include "elf32-target.h" |