elf32-m68k.c revision 1.4
1 /* Motorola 68k series support for 32-bit ELF 2 Copyright 1993, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 3 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 4 Free Software Foundation, Inc. 5 6 This file is part of BFD, the Binary File Descriptor library. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 21 MA 02110-1301, USA. */ 22 23 #include "sysdep.h" 24 #include "bfd.h" 25 #include "bfdlink.h" 26 #include "libbfd.h" 27 #include "elf-bfd.h" 28 #include "elf/m68k.h" 29 #include "opcode/m68k.h" 30 31 static bfd_boolean 32 elf_m68k_discard_copies (struct elf_link_hash_entry *, void *); 33 34 static reloc_howto_type howto_table[] = 35 { 36 HOWTO(R_68K_NONE, 0, 0, 0, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_NONE", FALSE, 0, 0x00000000,FALSE), 37 HOWTO(R_68K_32, 0, 2,32, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_32", FALSE, 0, 0xffffffff,FALSE), 38 HOWTO(R_68K_16, 0, 1,16, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_16", FALSE, 0, 0x0000ffff,FALSE), 39 HOWTO(R_68K_8, 0, 0, 8, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_8", FALSE, 0, 0x000000ff,FALSE), 40 HOWTO(R_68K_PC32, 0, 2,32, TRUE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PC32", FALSE, 0, 0xffffffff,TRUE), 41 HOWTO(R_68K_PC16, 0, 1,16, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC16", FALSE, 0, 0x0000ffff,TRUE), 42 HOWTO(R_68K_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC8", FALSE, 0, 0x000000ff,TRUE), 43 HOWTO(R_68K_GOT32, 0, 2,32, TRUE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32", FALSE, 0, 0xffffffff,TRUE), 44 HOWTO(R_68K_GOT16, 0, 1,16, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16", FALSE, 0, 0x0000ffff,TRUE), 45 HOWTO(R_68K_GOT8, 0, 0, 8, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8", FALSE, 0, 0x000000ff,TRUE), 46 HOWTO(R_68K_GOT32O, 0, 2,32, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32O", FALSE, 0, 0xffffffff,FALSE), 47 HOWTO(R_68K_GOT16O, 0, 1,16, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16O", FALSE, 0, 0x0000ffff,FALSE), 48 HOWTO(R_68K_GOT8O, 0, 0, 8, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8O", FALSE, 0, 0x000000ff,FALSE), 49 HOWTO(R_68K_PLT32, 0, 2,32, TRUE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32", FALSE, 0, 0xffffffff,TRUE), 50 HOWTO(R_68K_PLT16, 0, 1,16, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16", FALSE, 0, 0x0000ffff,TRUE), 51 HOWTO(R_68K_PLT8, 0, 0, 8, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8", FALSE, 0, 0x000000ff,TRUE), 52 HOWTO(R_68K_PLT32O, 0, 2,32, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32O", FALSE, 0, 0xffffffff,FALSE), 53 HOWTO(R_68K_PLT16O, 0, 1,16, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16O", FALSE, 0, 0x0000ffff,FALSE), 54 HOWTO(R_68K_PLT8O, 0, 0, 8, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8O", FALSE, 0, 0x000000ff,FALSE), 55 HOWTO(R_68K_COPY, 0, 0, 0, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_COPY", FALSE, 0, 0xffffffff,FALSE), 56 HOWTO(R_68K_GLOB_DAT, 0, 2,32, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_GLOB_DAT", FALSE, 0, 0xffffffff,FALSE), 57 HOWTO(R_68K_JMP_SLOT, 0, 2,32, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_JMP_SLOT", FALSE, 0, 0xffffffff,FALSE), 58 HOWTO(R_68K_RELATIVE, 0, 2,32, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_RELATIVE", FALSE, 0, 0xffffffff,FALSE), 59 /* GNU extension to record C++ vtable hierarchy. */ 60 HOWTO (R_68K_GNU_VTINHERIT, /* type */ 61 0, /* rightshift */ 62 2, /* size (0 = byte, 1 = short, 2 = long) */ 63 0, /* bitsize */ 64 FALSE, /* pc_relative */ 65 0, /* bitpos */ 66 complain_overflow_dont, /* complain_on_overflow */ 67 NULL, /* special_function */ 68 "R_68K_GNU_VTINHERIT", /* name */ 69 FALSE, /* partial_inplace */ 70 0, /* src_mask */ 71 0, /* dst_mask */ 72 FALSE), 73 /* GNU extension to record C++ vtable member usage. */ 74 HOWTO (R_68K_GNU_VTENTRY, /* type */ 75 0, /* rightshift */ 76 2, /* size (0 = byte, 1 = short, 2 = long) */ 77 0, /* bitsize */ 78 FALSE, /* pc_relative */ 79 0, /* bitpos */ 80 complain_overflow_dont, /* complain_on_overflow */ 81 _bfd_elf_rel_vtable_reloc_fn, /* special_function */ 82 "R_68K_GNU_VTENTRY", /* name */ 83 FALSE, /* partial_inplace */ 84 0, /* src_mask */ 85 0, /* dst_mask */ 86 FALSE), 87 88 /* TLS general dynamic variable reference. */ 89 HOWTO (R_68K_TLS_GD32, /* type */ 90 0, /* rightshift */ 91 2, /* size (0 = byte, 1 = short, 2 = long) */ 92 32, /* bitsize */ 93 FALSE, /* pc_relative */ 94 0, /* bitpos */ 95 complain_overflow_bitfield, /* complain_on_overflow */ 96 bfd_elf_generic_reloc, /* special_function */ 97 "R_68K_TLS_GD32", /* name */ 98 FALSE, /* partial_inplace */ 99 0, /* src_mask */ 100 0xffffffff, /* dst_mask */ 101 FALSE), /* pcrel_offset */ 102 103 HOWTO (R_68K_TLS_GD16, /* type */ 104 0, /* rightshift */ 105 1, /* size (0 = byte, 1 = short, 2 = long) */ 106 16, /* bitsize */ 107 FALSE, /* pc_relative */ 108 0, /* bitpos */ 109 complain_overflow_signed, /* complain_on_overflow */ 110 bfd_elf_generic_reloc, /* special_function */ 111 "R_68K_TLS_GD16", /* name */ 112 FALSE, /* partial_inplace */ 113 0, /* src_mask */ 114 0x0000ffff, /* dst_mask */ 115 FALSE), /* pcrel_offset */ 116 117 HOWTO (R_68K_TLS_GD8, /* type */ 118 0, /* rightshift */ 119 0, /* size (0 = byte, 1 = short, 2 = long) */ 120 8, /* bitsize */ 121 FALSE, /* pc_relative */ 122 0, /* bitpos */ 123 complain_overflow_signed, /* complain_on_overflow */ 124 bfd_elf_generic_reloc, /* special_function */ 125 "R_68K_TLS_GD8", /* name */ 126 FALSE, /* partial_inplace */ 127 0, /* src_mask */ 128 0x000000ff, /* dst_mask */ 129 FALSE), /* pcrel_offset */ 130 131 /* TLS local dynamic variable reference. */ 132 HOWTO (R_68K_TLS_LDM32, /* type */ 133 0, /* rightshift */ 134 2, /* size (0 = byte, 1 = short, 2 = long) */ 135 32, /* bitsize */ 136 FALSE, /* pc_relative */ 137 0, /* bitpos */ 138 complain_overflow_bitfield, /* complain_on_overflow */ 139 bfd_elf_generic_reloc, /* special_function */ 140 "R_68K_TLS_LDM32", /* name */ 141 FALSE, /* partial_inplace */ 142 0, /* src_mask */ 143 0xffffffff, /* dst_mask */ 144 FALSE), /* pcrel_offset */ 145 146 HOWTO (R_68K_TLS_LDM16, /* type */ 147 0, /* rightshift */ 148 1, /* size (0 = byte, 1 = short, 2 = long) */ 149 16, /* bitsize */ 150 FALSE, /* pc_relative */ 151 0, /* bitpos */ 152 complain_overflow_signed, /* complain_on_overflow */ 153 bfd_elf_generic_reloc, /* special_function */ 154 "R_68K_TLS_LDM16", /* name */ 155 FALSE, /* partial_inplace */ 156 0, /* src_mask */ 157 0x0000ffff, /* dst_mask */ 158 FALSE), /* pcrel_offset */ 159 160 HOWTO (R_68K_TLS_LDM8, /* type */ 161 0, /* rightshift */ 162 0, /* size (0 = byte, 1 = short, 2 = long) */ 163 8, /* bitsize */ 164 FALSE, /* pc_relative */ 165 0, /* bitpos */ 166 complain_overflow_signed, /* complain_on_overflow */ 167 bfd_elf_generic_reloc, /* special_function */ 168 "R_68K_TLS_LDM8", /* name */ 169 FALSE, /* partial_inplace */ 170 0, /* src_mask */ 171 0x000000ff, /* dst_mask */ 172 FALSE), /* pcrel_offset */ 173 174 HOWTO (R_68K_TLS_LDO32, /* type */ 175 0, /* rightshift */ 176 2, /* size (0 = byte, 1 = short, 2 = long) */ 177 32, /* bitsize */ 178 FALSE, /* pc_relative */ 179 0, /* bitpos */ 180 complain_overflow_bitfield, /* complain_on_overflow */ 181 bfd_elf_generic_reloc, /* special_function */ 182 "R_68K_TLS_LDO32", /* name */ 183 FALSE, /* partial_inplace */ 184 0, /* src_mask */ 185 0xffffffff, /* dst_mask */ 186 FALSE), /* pcrel_offset */ 187 188 HOWTO (R_68K_TLS_LDO16, /* type */ 189 0, /* rightshift */ 190 1, /* size (0 = byte, 1 = short, 2 = long) */ 191 16, /* bitsize */ 192 FALSE, /* pc_relative */ 193 0, /* bitpos */ 194 complain_overflow_signed, /* complain_on_overflow */ 195 bfd_elf_generic_reloc, /* special_function */ 196 "R_68K_TLS_LDO16", /* name */ 197 FALSE, /* partial_inplace */ 198 0, /* src_mask */ 199 0x0000ffff, /* dst_mask */ 200 FALSE), /* pcrel_offset */ 201 202 HOWTO (R_68K_TLS_LDO8, /* type */ 203 0, /* rightshift */ 204 0, /* size (0 = byte, 1 = short, 2 = long) */ 205 8, /* bitsize */ 206 FALSE, /* pc_relative */ 207 0, /* bitpos */ 208 complain_overflow_signed, /* complain_on_overflow */ 209 bfd_elf_generic_reloc, /* special_function */ 210 "R_68K_TLS_LDO8", /* name */ 211 FALSE, /* partial_inplace */ 212 0, /* src_mask */ 213 0x000000ff, /* dst_mask */ 214 FALSE), /* pcrel_offset */ 215 216 /* TLS initial execution variable reference. */ 217 HOWTO (R_68K_TLS_IE32, /* type */ 218 0, /* rightshift */ 219 2, /* size (0 = byte, 1 = short, 2 = long) */ 220 32, /* bitsize */ 221 FALSE, /* pc_relative */ 222 0, /* bitpos */ 223 complain_overflow_bitfield, /* complain_on_overflow */ 224 bfd_elf_generic_reloc, /* special_function */ 225 "R_68K_TLS_IE32", /* name */ 226 FALSE, /* partial_inplace */ 227 0, /* src_mask */ 228 0xffffffff, /* dst_mask */ 229 FALSE), /* pcrel_offset */ 230 231 HOWTO (R_68K_TLS_IE16, /* type */ 232 0, /* rightshift */ 233 1, /* size (0 = byte, 1 = short, 2 = long) */ 234 16, /* bitsize */ 235 FALSE, /* pc_relative */ 236 0, /* bitpos */ 237 complain_overflow_signed, /* complain_on_overflow */ 238 bfd_elf_generic_reloc, /* special_function */ 239 "R_68K_TLS_IE16", /* name */ 240 FALSE, /* partial_inplace */ 241 0, /* src_mask */ 242 0x0000ffff, /* dst_mask */ 243 FALSE), /* pcrel_offset */ 244 245 HOWTO (R_68K_TLS_IE8, /* type */ 246 0, /* rightshift */ 247 0, /* size (0 = byte, 1 = short, 2 = long) */ 248 8, /* bitsize */ 249 FALSE, /* pc_relative */ 250 0, /* bitpos */ 251 complain_overflow_signed, /* complain_on_overflow */ 252 bfd_elf_generic_reloc, /* special_function */ 253 "R_68K_TLS_IE8", /* name */ 254 FALSE, /* partial_inplace */ 255 0, /* src_mask */ 256 0x000000ff, /* dst_mask */ 257 FALSE), /* pcrel_offset */ 258 259 /* TLS local execution variable reference. */ 260 HOWTO (R_68K_TLS_LE32, /* type */ 261 0, /* rightshift */ 262 2, /* size (0 = byte, 1 = short, 2 = long) */ 263 32, /* bitsize */ 264 FALSE, /* pc_relative */ 265 0, /* bitpos */ 266 complain_overflow_bitfield, /* complain_on_overflow */ 267 bfd_elf_generic_reloc, /* special_function */ 268 "R_68K_TLS_LE32", /* name */ 269 FALSE, /* partial_inplace */ 270 0, /* src_mask */ 271 0xffffffff, /* dst_mask */ 272 FALSE), /* pcrel_offset */ 273 274 HOWTO (R_68K_TLS_LE16, /* type */ 275 0, /* rightshift */ 276 1, /* size (0 = byte, 1 = short, 2 = long) */ 277 16, /* bitsize */ 278 FALSE, /* pc_relative */ 279 0, /* bitpos */ 280 complain_overflow_signed, /* complain_on_overflow */ 281 bfd_elf_generic_reloc, /* special_function */ 282 "R_68K_TLS_LE16", /* name */ 283 FALSE, /* partial_inplace */ 284 0, /* src_mask */ 285 0x0000ffff, /* dst_mask */ 286 FALSE), /* pcrel_offset */ 287 288 HOWTO (R_68K_TLS_LE8, /* type */ 289 0, /* rightshift */ 290 0, /* size (0 = byte, 1 = short, 2 = long) */ 291 8, /* bitsize */ 292 FALSE, /* pc_relative */ 293 0, /* bitpos */ 294 complain_overflow_signed, /* complain_on_overflow */ 295 bfd_elf_generic_reloc, /* special_function */ 296 "R_68K_TLS_LE8", /* name */ 297 FALSE, /* partial_inplace */ 298 0, /* src_mask */ 299 0x000000ff, /* dst_mask */ 300 FALSE), /* pcrel_offset */ 301 302 /* TLS GD/LD dynamic relocations. */ 303 HOWTO (R_68K_TLS_DTPMOD32, /* type */ 304 0, /* rightshift */ 305 2, /* size (0 = byte, 1 = short, 2 = long) */ 306 32, /* bitsize */ 307 FALSE, /* pc_relative */ 308 0, /* bitpos */ 309 complain_overflow_dont, /* complain_on_overflow */ 310 bfd_elf_generic_reloc, /* special_function */ 311 "R_68K_TLS_DTPMOD32", /* name */ 312 FALSE, /* partial_inplace */ 313 0, /* src_mask */ 314 0xffffffff, /* dst_mask */ 315 FALSE), /* pcrel_offset */ 316 317 HOWTO (R_68K_TLS_DTPREL32, /* type */ 318 0, /* rightshift */ 319 2, /* size (0 = byte, 1 = short, 2 = long) */ 320 32, /* bitsize */ 321 FALSE, /* pc_relative */ 322 0, /* bitpos */ 323 complain_overflow_dont, /* complain_on_overflow */ 324 bfd_elf_generic_reloc, /* special_function */ 325 "R_68K_TLS_DTPREL32", /* name */ 326 FALSE, /* partial_inplace */ 327 0, /* src_mask */ 328 0xffffffff, /* dst_mask */ 329 FALSE), /* pcrel_offset */ 330 331 HOWTO (R_68K_TLS_TPREL32, /* type */ 332 0, /* rightshift */ 333 2, /* size (0 = byte, 1 = short, 2 = long) */ 334 32, /* bitsize */ 335 FALSE, /* pc_relative */ 336 0, /* bitpos */ 337 complain_overflow_dont, /* complain_on_overflow */ 338 bfd_elf_generic_reloc, /* special_function */ 339 "R_68K_TLS_TPREL32", /* name */ 340 FALSE, /* partial_inplace */ 341 0, /* src_mask */ 342 0xffffffff, /* dst_mask */ 343 FALSE), /* pcrel_offset */ 344 }; 345 346 static void 347 rtype_to_howto (bfd *abfd, arelent *cache_ptr, Elf_Internal_Rela *dst) 348 { 349 unsigned int indx = ELF32_R_TYPE (dst->r_info); 350 351 if (indx >= (unsigned int) R_68K_max) 352 { 353 (*_bfd_error_handler) (_("%B: invalid relocation type %d"), 354 abfd, (int) indx); 355 indx = R_68K_NONE; 356 } 357 cache_ptr->howto = &howto_table[indx]; 358 } 359 360 #define elf_info_to_howto rtype_to_howto 361 362 static const struct 363 { 364 bfd_reloc_code_real_type bfd_val; 365 int elf_val; 366 } 367 reloc_map[] = 368 { 369 { BFD_RELOC_NONE, R_68K_NONE }, 370 { BFD_RELOC_32, R_68K_32 }, 371 { BFD_RELOC_16, R_68K_16 }, 372 { BFD_RELOC_8, R_68K_8 }, 373 { BFD_RELOC_32_PCREL, R_68K_PC32 }, 374 { BFD_RELOC_16_PCREL, R_68K_PC16 }, 375 { BFD_RELOC_8_PCREL, R_68K_PC8 }, 376 { BFD_RELOC_32_GOT_PCREL, R_68K_GOT32 }, 377 { BFD_RELOC_16_GOT_PCREL, R_68K_GOT16 }, 378 { BFD_RELOC_8_GOT_PCREL, R_68K_GOT8 }, 379 { BFD_RELOC_32_GOTOFF, R_68K_GOT32O }, 380 { BFD_RELOC_16_GOTOFF, R_68K_GOT16O }, 381 { BFD_RELOC_8_GOTOFF, R_68K_GOT8O }, 382 { BFD_RELOC_32_PLT_PCREL, R_68K_PLT32 }, 383 { BFD_RELOC_16_PLT_PCREL, R_68K_PLT16 }, 384 { BFD_RELOC_8_PLT_PCREL, R_68K_PLT8 }, 385 { BFD_RELOC_32_PLTOFF, R_68K_PLT32O }, 386 { BFD_RELOC_16_PLTOFF, R_68K_PLT16O }, 387 { BFD_RELOC_8_PLTOFF, R_68K_PLT8O }, 388 { BFD_RELOC_NONE, R_68K_COPY }, 389 { BFD_RELOC_68K_GLOB_DAT, R_68K_GLOB_DAT }, 390 { BFD_RELOC_68K_JMP_SLOT, R_68K_JMP_SLOT }, 391 { BFD_RELOC_68K_RELATIVE, R_68K_RELATIVE }, 392 { BFD_RELOC_CTOR, R_68K_32 }, 393 { BFD_RELOC_VTABLE_INHERIT, R_68K_GNU_VTINHERIT }, 394 { BFD_RELOC_VTABLE_ENTRY, R_68K_GNU_VTENTRY }, 395 { BFD_RELOC_68K_TLS_GD32, R_68K_TLS_GD32 }, 396 { BFD_RELOC_68K_TLS_GD16, R_68K_TLS_GD16 }, 397 { BFD_RELOC_68K_TLS_GD8, R_68K_TLS_GD8 }, 398 { BFD_RELOC_68K_TLS_LDM32, R_68K_TLS_LDM32 }, 399 { BFD_RELOC_68K_TLS_LDM16, R_68K_TLS_LDM16 }, 400 { BFD_RELOC_68K_TLS_LDM8, R_68K_TLS_LDM8 }, 401 { BFD_RELOC_68K_TLS_LDO32, R_68K_TLS_LDO32 }, 402 { BFD_RELOC_68K_TLS_LDO16, R_68K_TLS_LDO16 }, 403 { BFD_RELOC_68K_TLS_LDO8, R_68K_TLS_LDO8 }, 404 { BFD_RELOC_68K_TLS_IE32, R_68K_TLS_IE32 }, 405 { BFD_RELOC_68K_TLS_IE16, R_68K_TLS_IE16 }, 406 { BFD_RELOC_68K_TLS_IE8, R_68K_TLS_IE8 }, 407 { BFD_RELOC_68K_TLS_LE32, R_68K_TLS_LE32 }, 408 { BFD_RELOC_68K_TLS_LE16, R_68K_TLS_LE16 }, 409 { BFD_RELOC_68K_TLS_LE8, R_68K_TLS_LE8 }, 410 }; 411 412 static reloc_howto_type * 413 reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, 414 bfd_reloc_code_real_type code) 415 { 416 unsigned int i; 417 for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++) 418 { 419 if (reloc_map[i].bfd_val == code) 420 return &howto_table[reloc_map[i].elf_val]; 421 } 422 return 0; 423 } 424 425 static reloc_howto_type * 426 reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name) 427 { 428 unsigned int i; 429 430 for (i = 0; i < sizeof (howto_table) / sizeof (howto_table[0]); i++) 431 if (howto_table[i].name != NULL 432 && strcasecmp (howto_table[i].name, r_name) == 0) 433 return &howto_table[i]; 434 435 return NULL; 436 } 437 438 #define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup 439 #define bfd_elf32_bfd_reloc_name_lookup reloc_name_lookup 440 #define ELF_ARCH bfd_arch_m68k 441 #define ELF_TARGET_ID M68K_ELF_DATA 442 443 /* Functions for the m68k ELF linker. */ 445 446 /* The name of the dynamic interpreter. This is put in the .interp 447 section. */ 448 449 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" 450 451 /* Describes one of the various PLT styles. */ 452 453 struct elf_m68k_plt_info 454 { 455 /* The size of each PLT entry. */ 456 bfd_vma size; 457 458 /* The template for the first PLT entry. */ 459 const bfd_byte *plt0_entry; 460 461 /* Offsets of fields in PLT0_ENTRY that require R_68K_PC32 relocations. 462 The comments by each member indicate the value that the relocation 463 is against. */ 464 struct { 465 unsigned int got4; /* .got + 4 */ 466 unsigned int got8; /* .got + 8 */ 467 } plt0_relocs; 468 469 /* The template for a symbol's PLT entry. */ 470 const bfd_byte *symbol_entry; 471 472 /* Offsets of fields in SYMBOL_ENTRY that require R_68K_PC32 relocations. 473 The comments by each member indicate the value that the relocation 474 is against. */ 475 struct { 476 unsigned int got; /* the symbol's .got.plt entry */ 477 unsigned int plt; /* .plt */ 478 } symbol_relocs; 479 480 /* The offset of the resolver stub from the start of SYMBOL_ENTRY. 481 The stub starts with "move.l #relocoffset,%d0". */ 482 bfd_vma symbol_resolve_entry; 483 }; 484 485 /* The size in bytes of an entry in the procedure linkage table. */ 486 487 #define PLT_ENTRY_SIZE 20 488 489 /* The first entry in a procedure linkage table looks like this. See 490 the SVR4 ABI m68k supplement to see how this works. */ 491 492 static const bfd_byte elf_m68k_plt0_entry[PLT_ENTRY_SIZE] = 493 { 494 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */ 495 0, 0, 0, 2, /* + (.got + 4) - . */ 496 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,addr]) */ 497 0, 0, 0, 2, /* + (.got + 8) - . */ 498 0, 0, 0, 0 /* pad out to 20 bytes. */ 499 }; 500 501 /* Subsequent entries in a procedure linkage table look like this. */ 502 503 static const bfd_byte elf_m68k_plt_entry[PLT_ENTRY_SIZE] = 504 { 505 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,symbol@GOTPC]) */ 506 0, 0, 0, 2, /* + (.got.plt entry) - . */ 507 0x2f, 0x3c, /* move.l #offset,-(%sp) */ 508 0, 0, 0, 0, /* + reloc index */ 509 0x60, 0xff, /* bra.l .plt */ 510 0, 0, 0, 0 /* + .plt - . */ 511 }; 512 513 static const struct elf_m68k_plt_info elf_m68k_plt_info = { 514 PLT_ENTRY_SIZE, 515 elf_m68k_plt0_entry, { 4, 12 }, 516 elf_m68k_plt_entry, { 4, 16 }, 8 517 }; 518 519 #define ISAB_PLT_ENTRY_SIZE 24 520 521 static const bfd_byte elf_isab_plt0_entry[ISAB_PLT_ENTRY_SIZE] = 522 { 523 0x20, 0x3c, /* move.l #offset,%d0 */ 524 0, 0, 0, 0, /* + (.got + 4) - . */ 525 0x2f, 0x3b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l),-(%sp) */ 526 0x20, 0x3c, /* move.l #offset,%d0 */ 527 0, 0, 0, 0, /* + (.got + 8) - . */ 528 0x20, 0x7b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l), %a0 */ 529 0x4e, 0xd0, /* jmp (%a0) */ 530 0x4e, 0x71 /* nop */ 531 }; 532 533 /* Subsequent entries in a procedure linkage table look like this. */ 534 535 static const bfd_byte elf_isab_plt_entry[ISAB_PLT_ENTRY_SIZE] = 536 { 537 0x20, 0x3c, /* move.l #offset,%d0 */ 538 0, 0, 0, 0, /* + (.got.plt entry) - . */ 539 0x20, 0x7b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l), %a0 */ 540 0x4e, 0xd0, /* jmp (%a0) */ 541 0x2f, 0x3c, /* move.l #offset,-(%sp) */ 542 0, 0, 0, 0, /* + reloc index */ 543 0x60, 0xff, /* bra.l .plt */ 544 0, 0, 0, 0 /* + .plt - . */ 545 }; 546 547 static const struct elf_m68k_plt_info elf_isab_plt_info = { 548 ISAB_PLT_ENTRY_SIZE, 549 elf_isab_plt0_entry, { 2, 12 }, 550 elf_isab_plt_entry, { 2, 20 }, 12 551 }; 552 553 #define ISAC_PLT_ENTRY_SIZE 24 554 555 static const bfd_byte elf_isac_plt0_entry[ISAC_PLT_ENTRY_SIZE] = 556 { 557 0x20, 0x3c, /* move.l #offset,%d0 */ 558 0, 0, 0, 0, /* replaced with .got + 4 - . */ 559 0x2e, 0xbb, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l),(%sp) */ 560 0x20, 0x3c, /* move.l #offset,%d0 */ 561 0, 0, 0, 0, /* replaced with .got + 8 - . */ 562 0x20, 0x7b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l), %a0 */ 563 0x4e, 0xd0, /* jmp (%a0) */ 564 0x4e, 0x71 /* nop */ 565 }; 566 567 /* Subsequent entries in a procedure linkage table look like this. */ 568 569 static const bfd_byte elf_isac_plt_entry[ISAC_PLT_ENTRY_SIZE] = 570 { 571 0x20, 0x3c, /* move.l #offset,%d0 */ 572 0, 0, 0, 0, /* replaced with (.got entry) - . */ 573 0x20, 0x7b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l), %a0 */ 574 0x4e, 0xd0, /* jmp (%a0) */ 575 0x2f, 0x3c, /* move.l #offset,-(%sp) */ 576 0, 0, 0, 0, /* replaced with offset into relocation table */ 577 0x61, 0xff, /* bsr.l .plt */ 578 0, 0, 0, 0 /* replaced with .plt - . */ 579 }; 580 581 static const struct elf_m68k_plt_info elf_isac_plt_info = { 582 ISAC_PLT_ENTRY_SIZE, 583 elf_isac_plt0_entry, { 2, 12}, 584 elf_isac_plt_entry, { 2, 20 }, 12 585 }; 586 587 #define CPU32_PLT_ENTRY_SIZE 24 588 /* Procedure linkage table entries for the cpu32 */ 589 static const bfd_byte elf_cpu32_plt0_entry[CPU32_PLT_ENTRY_SIZE] = 590 { 591 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */ 592 0, 0, 0, 2, /* + (.got + 4) - . */ 593 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */ 594 0, 0, 0, 2, /* + (.got + 8) - . */ 595 0x4e, 0xd1, /* jmp %a1@ */ 596 0, 0, 0, 0, /* pad out to 24 bytes. */ 597 0, 0 598 }; 599 600 static const bfd_byte elf_cpu32_plt_entry[CPU32_PLT_ENTRY_SIZE] = 601 { 602 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */ 603 0, 0, 0, 2, /* + (.got.plt entry) - . */ 604 0x4e, 0xd1, /* jmp %a1@ */ 605 0x2f, 0x3c, /* move.l #offset,-(%sp) */ 606 0, 0, 0, 0, /* + reloc index */ 607 0x60, 0xff, /* bra.l .plt */ 608 0, 0, 0, 0, /* + .plt - . */ 609 0, 0 610 }; 611 612 static const struct elf_m68k_plt_info elf_cpu32_plt_info = { 613 CPU32_PLT_ENTRY_SIZE, 614 elf_cpu32_plt0_entry, { 4, 12 }, 615 elf_cpu32_plt_entry, { 4, 18 }, 10 616 }; 617 618 /* The m68k linker needs to keep track of the number of relocs that it 619 decides to copy in check_relocs for each symbol. This is so that it 620 can discard PC relative relocs if it doesn't need them when linking 621 with -Bsymbolic. We store the information in a field extending the 622 regular ELF linker hash table. */ 623 624 /* This structure keeps track of the number of PC relative relocs we have 625 copied for a given symbol. */ 626 627 struct elf_m68k_pcrel_relocs_copied 628 { 629 /* Next section. */ 630 struct elf_m68k_pcrel_relocs_copied *next; 631 /* A section in dynobj. */ 632 asection *section; 633 /* Number of relocs copied in this section. */ 634 bfd_size_type count; 635 }; 636 637 /* Forward declaration. */ 638 struct elf_m68k_got_entry; 639 640 /* m68k ELF linker hash entry. */ 641 642 struct elf_m68k_link_hash_entry 643 { 644 struct elf_link_hash_entry root; 645 646 /* Number of PC relative relocs copied for this symbol. */ 647 struct elf_m68k_pcrel_relocs_copied *pcrel_relocs_copied; 648 649 /* Key to got_entries. */ 650 unsigned long got_entry_key; 651 652 /* List of GOT entries for this symbol. This list is build during 653 offset finalization and is used within elf_m68k_finish_dynamic_symbol 654 to traverse all GOT entries for a particular symbol. 655 656 ??? We could've used root.got.glist field instead, but having 657 a separate field is cleaner. */ 658 struct elf_m68k_got_entry *glist; 659 }; 660 661 #define elf_m68k_hash_entry(ent) ((struct elf_m68k_link_hash_entry *) (ent)) 662 663 /* Key part of GOT entry in hashtable. */ 664 struct elf_m68k_got_entry_key 665 { 666 /* BFD in which this symbol was defined. NULL for global symbols. */ 667 const bfd *bfd; 668 669 /* Symbol index. Either local symbol index or h->got_entry_key. */ 670 unsigned long symndx; 671 672 /* Type is one of R_68K_GOT{8, 16, 32}O, R_68K_TLS_GD{8, 16, 32}, 673 R_68K_TLS_LDM{8, 16, 32} or R_68K_TLS_IE{8, 16, 32}. 674 675 From perspective of hashtable key, only elf_m68k_got_reloc_type (type) 676 matters. That is, we distinguish between, say, R_68K_GOT16O 677 and R_68K_GOT32O when allocating offsets, but they are considered to be 678 the same when searching got->entries. */ 679 enum elf_m68k_reloc_type type; 680 }; 681 682 /* Size of the GOT offset suitable for relocation. */ 683 enum elf_m68k_got_offset_size { R_8, R_16, R_32, R_LAST }; 684 685 /* Entry of the GOT. */ 686 struct elf_m68k_got_entry 687 { 688 /* GOT entries are put into a got->entries hashtable. This is the key. */ 689 struct elf_m68k_got_entry_key key_; 690 691 /* GOT entry data. We need s1 before offset finalization and s2 after. */ 692 union 693 { 694 struct 695 { 696 /* Number of times this entry is referenced. It is used to 697 filter out unnecessary GOT slots in elf_m68k_gc_sweep_hook. */ 698 bfd_vma refcount; 699 } s1; 700 701 struct 702 { 703 /* Offset from the start of .got section. To calculate offset relative 704 to GOT pointer one should substract got->offset from this value. */ 705 bfd_vma offset; 706 707 /* Pointer to the next GOT entry for this global symbol. 708 Symbols have at most one entry in one GOT, but might 709 have entries in more than one GOT. 710 Root of this list is h->glist. 711 NULL for local symbols. */ 712 struct elf_m68k_got_entry *next; 713 } s2; 714 } u; 715 }; 716 717 /* Return representative type for relocation R_TYPE. 718 This is used to avoid enumerating many relocations in comparisons, 719 switches etc. */ 720 721 static enum elf_m68k_reloc_type 722 elf_m68k_reloc_got_type (enum elf_m68k_reloc_type r_type) 723 { 724 switch (r_type) 725 { 726 /* In most cases R_68K_GOTx relocations require the very same 727 handling as R_68K_GOT32O relocation. In cases when we need 728 to distinguish between the two, we use explicitly compare against 729 r_type. */ 730 case R_68K_GOT32: 731 case R_68K_GOT16: 732 case R_68K_GOT8: 733 case R_68K_GOT32O: 734 case R_68K_GOT16O: 735 case R_68K_GOT8O: 736 return R_68K_GOT32O; 737 738 case R_68K_TLS_GD32: 739 case R_68K_TLS_GD16: 740 case R_68K_TLS_GD8: 741 return R_68K_TLS_GD32; 742 743 case R_68K_TLS_LDM32: 744 case R_68K_TLS_LDM16: 745 case R_68K_TLS_LDM8: 746 return R_68K_TLS_LDM32; 747 748 case R_68K_TLS_IE32: 749 case R_68K_TLS_IE16: 750 case R_68K_TLS_IE8: 751 return R_68K_TLS_IE32; 752 753 default: 754 BFD_ASSERT (FALSE); 755 return 0; 756 } 757 } 758 759 /* Return size of the GOT entry offset for relocation R_TYPE. */ 760 761 static enum elf_m68k_got_offset_size 762 elf_m68k_reloc_got_offset_size (enum elf_m68k_reloc_type r_type) 763 { 764 switch (r_type) 765 { 766 case R_68K_GOT32: case R_68K_GOT16: case R_68K_GOT8: 767 case R_68K_GOT32O: case R_68K_TLS_GD32: case R_68K_TLS_LDM32: 768 case R_68K_TLS_IE32: 769 return R_32; 770 771 case R_68K_GOT16O: case R_68K_TLS_GD16: case R_68K_TLS_LDM16: 772 case R_68K_TLS_IE16: 773 return R_16; 774 775 case R_68K_GOT8O: case R_68K_TLS_GD8: case R_68K_TLS_LDM8: 776 case R_68K_TLS_IE8: 777 return R_8; 778 779 default: 780 BFD_ASSERT (FALSE); 781 return 0; 782 } 783 } 784 785 /* Return number of GOT entries we need to allocate in GOT for 786 relocation R_TYPE. */ 787 788 static bfd_vma 789 elf_m68k_reloc_got_n_slots (enum elf_m68k_reloc_type r_type) 790 { 791 switch (elf_m68k_reloc_got_type (r_type)) 792 { 793 case R_68K_GOT32O: 794 case R_68K_TLS_IE32: 795 return 1; 796 797 case R_68K_TLS_GD32: 798 case R_68K_TLS_LDM32: 799 return 2; 800 801 default: 802 BFD_ASSERT (FALSE); 803 return 0; 804 } 805 } 806 807 /* Return TRUE if relocation R_TYPE is a TLS one. */ 808 809 static bfd_boolean 810 elf_m68k_reloc_tls_p (enum elf_m68k_reloc_type r_type) 811 { 812 switch (r_type) 813 { 814 case R_68K_TLS_GD32: case R_68K_TLS_GD16: case R_68K_TLS_GD8: 815 case R_68K_TLS_LDM32: case R_68K_TLS_LDM16: case R_68K_TLS_LDM8: 816 case R_68K_TLS_LDO32: case R_68K_TLS_LDO16: case R_68K_TLS_LDO8: 817 case R_68K_TLS_IE32: case R_68K_TLS_IE16: case R_68K_TLS_IE8: 818 case R_68K_TLS_LE32: case R_68K_TLS_LE16: case R_68K_TLS_LE8: 819 case R_68K_TLS_DTPMOD32: case R_68K_TLS_DTPREL32: case R_68K_TLS_TPREL32: 820 return TRUE; 821 822 default: 823 return FALSE; 824 } 825 } 826 827 /* Data structure representing a single GOT. */ 828 struct elf_m68k_got 829 { 830 /* Hashtable of 'struct elf_m68k_got_entry's. 831 Starting size of this table is the maximum number of 832 R_68K_GOT8O entries. */ 833 htab_t entries; 834 835 /* Number of R_x slots in this GOT. Some (e.g., TLS) entries require 836 several GOT slots. 837 838 n_slots[R_8] is the count of R_8 slots in this GOT. 839 n_slots[R_16] is the cumulative count of R_8 and R_16 slots 840 in this GOT. 841 n_slots[R_32] is the cumulative count of R_8, R_16 and R_32 slots 842 in this GOT. This is the total number of slots. */ 843 bfd_vma n_slots[R_LAST]; 844 845 /* Number of local (entry->key_.h == NULL) slots in this GOT. 846 This is only used to properly calculate size of .rela.got section; 847 see elf_m68k_partition_multi_got. */ 848 bfd_vma local_n_slots; 849 850 /* Offset of this GOT relative to beginning of .got section. */ 851 bfd_vma offset; 852 }; 853 854 /* BFD and its GOT. This is an entry in multi_got->bfd2got hashtable. */ 855 struct elf_m68k_bfd2got_entry 856 { 857 /* BFD. */ 858 const bfd *bfd; 859 860 /* Assigned GOT. Before partitioning multi-GOT each BFD has its own 861 GOT structure. After partitioning several BFD's might [and often do] 862 share a single GOT. */ 863 struct elf_m68k_got *got; 864 }; 865 866 /* The main data structure holding all the pieces. */ 867 struct elf_m68k_multi_got 868 { 869 /* Hashtable mapping each BFD to its GOT. If a BFD doesn't have an entry 870 here, then it doesn't need a GOT (this includes the case of a BFD 871 having an empty GOT). 872 873 ??? This hashtable can be replaced by an array indexed by bfd->id. */ 874 htab_t bfd2got; 875 876 /* Next symndx to assign a global symbol. 877 h->got_entry_key is initialized from this counter. */ 878 unsigned long global_symndx; 879 }; 880 881 /* m68k ELF linker hash table. */ 882 883 struct elf_m68k_link_hash_table 884 { 885 struct elf_link_hash_table root; 886 887 /* Small local sym cache. */ 888 struct sym_cache sym_cache; 889 890 /* The PLT format used by this link, or NULL if the format has not 891 yet been chosen. */ 892 const struct elf_m68k_plt_info *plt_info; 893 894 /* True, if GP is loaded within each function which uses it. 895 Set to TRUE when GOT negative offsets or multi-GOT is enabled. */ 896 bfd_boolean local_gp_p; 897 898 /* Switch controlling use of negative offsets to double the size of GOTs. */ 899 bfd_boolean use_neg_got_offsets_p; 900 901 /* Switch controlling generation of multiple GOTs. */ 902 bfd_boolean allow_multigot_p; 903 904 /* Multi-GOT data structure. */ 905 struct elf_m68k_multi_got multi_got_; 906 }; 907 908 /* Get the m68k ELF linker hash table from a link_info structure. */ 909 910 #define elf_m68k_hash_table(p) \ 911 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \ 912 == M68K_ELF_DATA ? ((struct elf_m68k_link_hash_table *) ((p)->hash)) : NULL) 913 914 /* Shortcut to multi-GOT data. */ 915 #define elf_m68k_multi_got(INFO) (&elf_m68k_hash_table (INFO)->multi_got_) 916 917 /* Create an entry in an m68k ELF linker hash table. */ 918 919 static struct bfd_hash_entry * 920 elf_m68k_link_hash_newfunc (struct bfd_hash_entry *entry, 921 struct bfd_hash_table *table, 922 const char *string) 923 { 924 struct bfd_hash_entry *ret = entry; 925 926 /* Allocate the structure if it has not already been allocated by a 927 subclass. */ 928 if (ret == NULL) 929 ret = bfd_hash_allocate (table, 930 sizeof (struct elf_m68k_link_hash_entry)); 931 if (ret == NULL) 932 return ret; 933 934 /* Call the allocation method of the superclass. */ 935 ret = _bfd_elf_link_hash_newfunc (ret, table, string); 936 if (ret != NULL) 937 { 938 elf_m68k_hash_entry (ret)->pcrel_relocs_copied = NULL; 939 elf_m68k_hash_entry (ret)->got_entry_key = 0; 940 elf_m68k_hash_entry (ret)->glist = NULL; 941 } 942 943 return ret; 944 } 945 946 /* Create an m68k ELF linker hash table. */ 947 948 static struct bfd_link_hash_table * 949 elf_m68k_link_hash_table_create (bfd *abfd) 950 { 951 struct elf_m68k_link_hash_table *ret; 952 bfd_size_type amt = sizeof (struct elf_m68k_link_hash_table); 953 954 ret = (struct elf_m68k_link_hash_table *) bfd_malloc (amt); 955 if (ret == (struct elf_m68k_link_hash_table *) NULL) 956 return NULL; 957 958 if (!_bfd_elf_link_hash_table_init (&ret->root, abfd, 959 elf_m68k_link_hash_newfunc, 960 sizeof (struct elf_m68k_link_hash_entry), 961 M68K_ELF_DATA)) 962 { 963 free (ret); 964 return NULL; 965 } 966 967 ret->sym_cache.abfd = NULL; 968 ret->plt_info = NULL; 969 ret->local_gp_p = FALSE; 970 ret->use_neg_got_offsets_p = FALSE; 971 ret->allow_multigot_p = FALSE; 972 ret->multi_got_.bfd2got = NULL; 973 ret->multi_got_.global_symndx = 1; 974 975 return &ret->root.root; 976 } 977 978 /* Destruct local data. */ 979 980 static void 981 elf_m68k_link_hash_table_free (struct bfd_link_hash_table *_htab) 982 { 983 struct elf_m68k_link_hash_table *htab; 984 985 htab = (struct elf_m68k_link_hash_table *) _htab; 986 987 if (htab->multi_got_.bfd2got != NULL) 988 { 989 htab_delete (htab->multi_got_.bfd2got); 990 htab->multi_got_.bfd2got = NULL; 991 } 992 } 993 994 /* Set the right machine number. */ 995 996 static bfd_boolean 997 elf32_m68k_object_p (bfd *abfd) 998 { 999 unsigned int mach = 0; 1000 unsigned features = 0; 1001 flagword eflags = elf_elfheader (abfd)->e_flags; 1002 1003 if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_M68000) 1004 features |= m68000; 1005 else if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32) 1006 features |= cpu32; 1007 else if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO) 1008 features |= fido_a; 1009 else 1010 { 1011 switch (eflags & EF_M68K_CF_ISA_MASK) 1012 { 1013 case EF_M68K_CF_ISA_A_NODIV: 1014 features |= mcfisa_a; 1015 break; 1016 case EF_M68K_CF_ISA_A: 1017 features |= mcfisa_a|mcfhwdiv; 1018 break; 1019 case EF_M68K_CF_ISA_A_PLUS: 1020 features |= mcfisa_a|mcfisa_aa|mcfhwdiv|mcfusp; 1021 break; 1022 case EF_M68K_CF_ISA_B_NOUSP: 1023 features |= mcfisa_a|mcfisa_b|mcfhwdiv; 1024 break; 1025 case EF_M68K_CF_ISA_B: 1026 features |= mcfisa_a|mcfisa_b|mcfhwdiv|mcfusp; 1027 break; 1028 case EF_M68K_CF_ISA_C: 1029 features |= mcfisa_a|mcfisa_c|mcfhwdiv|mcfusp; 1030 break; 1031 case EF_M68K_CF_ISA_C_NODIV: 1032 features |= mcfisa_a|mcfisa_c|mcfusp; 1033 break; 1034 } 1035 switch (eflags & EF_M68K_CF_MAC_MASK) 1036 { 1037 case EF_M68K_CF_MAC: 1038 features |= mcfmac; 1039 break; 1040 case EF_M68K_CF_EMAC: 1041 features |= mcfemac; 1042 break; 1043 } 1044 if (eflags & EF_M68K_CF_FLOAT) 1045 features |= cfloat; 1046 } 1047 1048 mach = bfd_m68k_features_to_mach (features); 1049 bfd_default_set_arch_mach (abfd, bfd_arch_m68k, mach); 1050 1051 return TRUE; 1052 } 1053 1054 /* Somewhat reverse of elf32_m68k_object_p, this sets the e_flag 1055 field based on the machine number. */ 1056 1057 static void 1058 elf_m68k_final_write_processing (bfd *abfd, 1059 bfd_boolean linker ATTRIBUTE_UNUSED) 1060 { 1061 int mach = bfd_get_mach (abfd); 1062 unsigned long e_flags = elf_elfheader (abfd)->e_flags; 1063 1064 if (!e_flags) 1065 { 1066 unsigned int arch_mask; 1067 1068 arch_mask = bfd_m68k_mach_to_features (mach); 1069 1070 if (arch_mask & m68000) 1071 e_flags = EF_M68K_M68000; 1072 else if (arch_mask & cpu32) 1073 e_flags = EF_M68K_CPU32; 1074 else if (arch_mask & fido_a) 1075 e_flags = EF_M68K_FIDO; 1076 else 1077 { 1078 switch (arch_mask 1079 & (mcfisa_a | mcfisa_aa | mcfisa_b | mcfisa_c | mcfhwdiv | mcfusp)) 1080 { 1081 case mcfisa_a: 1082 e_flags |= EF_M68K_CF_ISA_A_NODIV; 1083 break; 1084 case mcfisa_a | mcfhwdiv: 1085 e_flags |= EF_M68K_CF_ISA_A; 1086 break; 1087 case mcfisa_a | mcfisa_aa | mcfhwdiv | mcfusp: 1088 e_flags |= EF_M68K_CF_ISA_A_PLUS; 1089 break; 1090 case mcfisa_a | mcfisa_b | mcfhwdiv: 1091 e_flags |= EF_M68K_CF_ISA_B_NOUSP; 1092 break; 1093 case mcfisa_a | mcfisa_b | mcfhwdiv | mcfusp: 1094 e_flags |= EF_M68K_CF_ISA_B; 1095 break; 1096 case mcfisa_a | mcfisa_c | mcfhwdiv | mcfusp: 1097 e_flags |= EF_M68K_CF_ISA_C; 1098 break; 1099 case mcfisa_a | mcfisa_c | mcfusp: 1100 e_flags |= EF_M68K_CF_ISA_C_NODIV; 1101 break; 1102 } 1103 if (arch_mask & mcfmac) 1104 e_flags |= EF_M68K_CF_MAC; 1105 else if (arch_mask & mcfemac) 1106 e_flags |= EF_M68K_CF_EMAC; 1107 if (arch_mask & cfloat) 1108 e_flags |= EF_M68K_CF_FLOAT | EF_M68K_CFV4E; 1109 } 1110 elf_elfheader (abfd)->e_flags = e_flags; 1111 } 1112 } 1113 1114 /* Keep m68k-specific flags in the ELF header. */ 1115 1116 static bfd_boolean 1117 elf32_m68k_set_private_flags (bfd *abfd, flagword flags) 1118 { 1119 elf_elfheader (abfd)->e_flags = flags; 1120 elf_flags_init (abfd) = TRUE; 1121 return TRUE; 1122 } 1123 1124 /* Merge backend specific data from an object file to the output 1125 object file when linking. */ 1126 static bfd_boolean 1127 elf32_m68k_merge_private_bfd_data (bfd *ibfd, bfd *obfd) 1128 { 1129 flagword out_flags; 1130 flagword in_flags; 1131 flagword out_isa; 1132 flagword in_isa; 1133 const bfd_arch_info_type *arch_info; 1134 1135 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour 1136 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 1137 return FALSE; 1138 1139 /* Get the merged machine. This checks for incompatibility between 1140 Coldfire & non-Coldfire flags, incompability between different 1141 Coldfire ISAs, and incompability between different MAC types. */ 1142 arch_info = bfd_arch_get_compatible (ibfd, obfd, FALSE); 1143 if (!arch_info) 1144 return FALSE; 1145 1146 bfd_set_arch_mach (obfd, bfd_arch_m68k, arch_info->mach); 1147 1148 in_flags = elf_elfheader (ibfd)->e_flags; 1149 if (!elf_flags_init (obfd)) 1150 { 1151 elf_flags_init (obfd) = TRUE; 1152 out_flags = in_flags; 1153 } 1154 else 1155 { 1156 out_flags = elf_elfheader (obfd)->e_flags; 1157 unsigned int variant_mask; 1158 1159 if ((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_M68000) 1160 variant_mask = 0; 1161 else if ((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32) 1162 variant_mask = 0; 1163 else if ((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO) 1164 variant_mask = 0; 1165 else 1166 variant_mask = EF_M68K_CF_ISA_MASK; 1167 1168 in_isa = (in_flags & variant_mask); 1169 out_isa = (out_flags & variant_mask); 1170 if (in_isa > out_isa) 1171 out_flags ^= in_isa ^ out_isa; 1172 if (((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32 1173 && (out_flags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO) 1174 || ((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO 1175 && (out_flags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32)) 1176 out_flags = EF_M68K_FIDO; 1177 else 1178 out_flags |= in_flags ^ in_isa; 1179 } 1180 elf_elfheader (obfd)->e_flags = out_flags; 1181 1182 return TRUE; 1183 } 1184 1185 /* Display the flags field. */ 1186 1187 static bfd_boolean 1188 elf32_m68k_print_private_bfd_data (bfd *abfd, void * ptr) 1189 { 1190 FILE *file = (FILE *) ptr; 1191 flagword eflags = elf_elfheader (abfd)->e_flags; 1192 1193 BFD_ASSERT (abfd != NULL && ptr != NULL); 1194 1195 /* Print normal ELF private data. */ 1196 _bfd_elf_print_private_bfd_data (abfd, ptr); 1197 1198 /* Ignore init flag - it may not be set, despite the flags field containing valid data. */ 1199 1200 /* xgettext:c-format */ 1201 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); 1202 1203 if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_M68000) 1204 fprintf (file, " [m68000]"); 1205 else if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32) 1206 fprintf (file, " [cpu32]"); 1207 else if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO) 1208 fprintf (file, " [fido]"); 1209 else 1210 { 1211 if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_CFV4E) 1212 fprintf (file, " [cfv4e]"); 1213 1214 if (eflags & EF_M68K_CF_ISA_MASK) 1215 { 1216 char const *isa = _("unknown"); 1217 char const *mac = _("unknown"); 1218 char const *additional = ""; 1219 1220 switch (eflags & EF_M68K_CF_ISA_MASK) 1221 { 1222 case EF_M68K_CF_ISA_A_NODIV: 1223 isa = "A"; 1224 additional = " [nodiv]"; 1225 break; 1226 case EF_M68K_CF_ISA_A: 1227 isa = "A"; 1228 break; 1229 case EF_M68K_CF_ISA_A_PLUS: 1230 isa = "A+"; 1231 break; 1232 case EF_M68K_CF_ISA_B_NOUSP: 1233 isa = "B"; 1234 additional = " [nousp]"; 1235 break; 1236 case EF_M68K_CF_ISA_B: 1237 isa = "B"; 1238 break; 1239 case EF_M68K_CF_ISA_C: 1240 isa = "C"; 1241 break; 1242 case EF_M68K_CF_ISA_C_NODIV: 1243 isa = "C"; 1244 additional = " [nodiv]"; 1245 break; 1246 } 1247 fprintf (file, " [isa %s]%s", isa, additional); 1248 1249 if (eflags & EF_M68K_CF_FLOAT) 1250 fprintf (file, " [float]"); 1251 1252 switch (eflags & EF_M68K_CF_MAC_MASK) 1253 { 1254 case 0: 1255 mac = NULL; 1256 break; 1257 case EF_M68K_CF_MAC: 1258 mac = "mac"; 1259 break; 1260 case EF_M68K_CF_EMAC: 1261 mac = "emac"; 1262 break; 1263 case EF_M68K_CF_EMAC_B: 1264 mac = "emac_b"; 1265 break; 1266 } 1267 if (mac) 1268 fprintf (file, " [%s]", mac); 1269 } 1270 } 1271 1272 fputc ('\n', file); 1273 1274 return TRUE; 1275 } 1276 1277 /* Multi-GOT support implementation design: 1278 1279 Multi-GOT starts in check_relocs hook. There we scan all 1280 relocations of a BFD and build a local GOT (struct elf_m68k_got) 1281 for it. If a single BFD appears to require too many GOT slots with 1282 R_68K_GOT8O or R_68K_GOT16O relocations, we fail with notification 1283 to user. 1284 After check_relocs has been invoked for each input BFD, we have 1285 constructed a GOT for each input BFD. 1286 1287 To minimize total number of GOTs required for a particular output BFD 1288 (as some environments support only 1 GOT per output object) we try 1289 to merge some of the GOTs to share an offset space. Ideally [and in most 1290 cases] we end up with a single GOT. In cases when there are too many 1291 restricted relocations (e.g., R_68K_GOT16O relocations) we end up with 1292 several GOTs, assuming the environment can handle them. 1293 1294 Partitioning is done in elf_m68k_partition_multi_got. We start with 1295 an empty GOT and traverse bfd2got hashtable putting got_entries from 1296 local GOTs to the new 'big' one. We do that by constructing an 1297 intermediate GOT holding all the entries the local GOT has and the big 1298 GOT lacks. Then we check if there is room in the big GOT to accomodate 1299 all the entries from diff. On success we add those entries to the big 1300 GOT; on failure we start the new 'big' GOT and retry the adding of 1301 entries from the local GOT. Note that this retry will always succeed as 1302 each local GOT doesn't overflow the limits. After partitioning we 1303 end up with each bfd assigned one of the big GOTs. GOT entries in the 1304 big GOTs are initialized with GOT offsets. Note that big GOTs are 1305 positioned consequently in program space and represent a single huge GOT 1306 to the outside world. 1307 1308 After that we get to elf_m68k_relocate_section. There we 1309 adjust relocations of GOT pointer (_GLOBAL_OFFSET_TABLE_) and symbol 1310 relocations to refer to appropriate [assigned to current input_bfd] 1311 big GOT. 1312 1313 Notes: 1314 1315 GOT entry type: We have several types of GOT entries. 1316 * R_8 type is used in entries for symbols that have at least one 1317 R_68K_GOT8O or R_68K_TLS_*8 relocation. We can have at most 0x40 1318 such entries in one GOT. 1319 * R_16 type is used in entries for symbols that have at least one 1320 R_68K_GOT16O or R_68K_TLS_*16 relocation and no R_8 relocations. 1321 We can have at most 0x4000 such entries in one GOT. 1322 * R_32 type is used in all other cases. We can have as many 1323 such entries in one GOT as we'd like. 1324 When counting relocations we have to include the count of the smaller 1325 ranged relocations in the counts of the larger ranged ones in order 1326 to correctly detect overflow. 1327 1328 Sorting the GOT: In each GOT starting offsets are assigned to 1329 R_8 entries, which are followed by R_16 entries, and 1330 R_32 entries go at the end. See finalize_got_offsets for details. 1331 1332 Negative GOT offsets: To double usable offset range of GOTs we use 1333 negative offsets. As we assign entries with GOT offsets relative to 1334 start of .got section, the offset values are positive. They become 1335 negative only in relocate_section where got->offset value is 1336 subtracted from them. 1337 1338 3 special GOT entries: There are 3 special GOT entries used internally 1339 by loader. These entries happen to be placed to .got.plt section, 1340 so we don't do anything about them in multi-GOT support. 1341 1342 Memory management: All data except for hashtables 1343 multi_got->bfd2got and got->entries are allocated on 1344 elf_hash_table (info)->dynobj bfd (for this reason we pass 'info' 1345 to most functions), so we don't need to care to free them. At the 1346 moment of allocation hashtables are being linked into main data 1347 structure (multi_got), all pieces of which are reachable from 1348 elf_m68k_multi_got (info). We deallocate them in 1349 elf_m68k_link_hash_table_free. */ 1350 1351 /* Initialize GOT. */ 1352 1353 static void 1354 elf_m68k_init_got (struct elf_m68k_got *got) 1355 { 1356 got->entries = NULL; 1357 got->n_slots[R_8] = 0; 1358 got->n_slots[R_16] = 0; 1359 got->n_slots[R_32] = 0; 1360 got->local_n_slots = 0; 1361 got->offset = (bfd_vma) -1; 1362 } 1363 1364 /* Destruct GOT. */ 1365 1366 static void 1367 elf_m68k_clear_got (struct elf_m68k_got *got) 1368 { 1369 if (got->entries != NULL) 1370 { 1371 htab_delete (got->entries); 1372 got->entries = NULL; 1373 } 1374 } 1375 1376 /* Create and empty GOT structure. INFO is the context where memory 1377 should be allocated. */ 1378 1379 static struct elf_m68k_got * 1380 elf_m68k_create_empty_got (struct bfd_link_info *info) 1381 { 1382 struct elf_m68k_got *got; 1383 1384 got = bfd_alloc (elf_hash_table (info)->dynobj, sizeof (*got)); 1385 if (got == NULL) 1386 return NULL; 1387 1388 elf_m68k_init_got (got); 1389 1390 return got; 1391 } 1392 1393 /* Initialize KEY. */ 1394 1395 static void 1396 elf_m68k_init_got_entry_key (struct elf_m68k_got_entry_key *key, 1397 struct elf_link_hash_entry *h, 1398 const bfd *abfd, unsigned long symndx, 1399 enum elf_m68k_reloc_type reloc_type) 1400 { 1401 if (elf_m68k_reloc_got_type (reloc_type) == R_68K_TLS_LDM32) 1402 /* All TLS_LDM relocations share a single GOT entry. */ 1403 { 1404 key->bfd = NULL; 1405 key->symndx = 0; 1406 } 1407 else if (h != NULL) 1408 /* Global symbols are identified with their got_entry_key. */ 1409 { 1410 key->bfd = NULL; 1411 key->symndx = elf_m68k_hash_entry (h)->got_entry_key; 1412 BFD_ASSERT (key->symndx != 0); 1413 } 1414 else 1415 /* Local symbols are identified by BFD they appear in and symndx. */ 1416 { 1417 key->bfd = abfd; 1418 key->symndx = symndx; 1419 } 1420 1421 key->type = reloc_type; 1422 } 1423 1424 /* Calculate hash of got_entry. 1425 ??? Is it good? */ 1426 1427 static hashval_t 1428 elf_m68k_got_entry_hash (const void *_entry) 1429 { 1430 const struct elf_m68k_got_entry_key *key; 1431 1432 key = &((const struct elf_m68k_got_entry *) _entry)->key_; 1433 1434 return (key->symndx 1435 + (key->bfd != NULL ? (int) key->bfd->id : -1) 1436 + elf_m68k_reloc_got_type (key->type)); 1437 } 1438 1439 /* Check if two got entries are equal. */ 1440 1441 static int 1442 elf_m68k_got_entry_eq (const void *_entry1, const void *_entry2) 1443 { 1444 const struct elf_m68k_got_entry_key *key1; 1445 const struct elf_m68k_got_entry_key *key2; 1446 1447 key1 = &((const struct elf_m68k_got_entry *) _entry1)->key_; 1448 key2 = &((const struct elf_m68k_got_entry *) _entry2)->key_; 1449 1450 return (key1->bfd == key2->bfd 1451 && key1->symndx == key2->symndx 1452 && (elf_m68k_reloc_got_type (key1->type) 1453 == elf_m68k_reloc_got_type (key2->type))); 1454 } 1455 1456 /* When using negative offsets, we allocate one extra R_8, one extra R_16 1457 and one extra R_32 slots to simplify handling of 2-slot entries during 1458 offset allocation -- hence -1 for R_8 slots and -2 for R_16 slots. */ 1459 1460 /* Maximal number of R_8 slots in a single GOT. */ 1461 #define ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT(INFO) \ 1462 (elf_m68k_hash_table (INFO)->use_neg_got_offsets_p \ 1463 ? (0x40 - 1) \ 1464 : 0x20) 1465 1466 /* Maximal number of R_8 and R_16 slots in a single GOT. */ 1467 #define ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT(INFO) \ 1468 (elf_m68k_hash_table (INFO)->use_neg_got_offsets_p \ 1469 ? (0x4000 - 2) \ 1470 : 0x2000) 1471 1472 /* SEARCH - simply search the hashtable, don't insert new entries or fail when 1473 the entry cannot be found. 1474 FIND_OR_CREATE - search for an existing entry, but create new if there's 1475 no such. 1476 MUST_FIND - search for an existing entry and assert that it exist. 1477 MUST_CREATE - assert that there's no such entry and create new one. */ 1478 enum elf_m68k_get_entry_howto 1479 { 1480 SEARCH, 1481 FIND_OR_CREATE, 1482 MUST_FIND, 1483 MUST_CREATE 1484 }; 1485 1486 /* Get or create (depending on HOWTO) entry with KEY in GOT. 1487 INFO is context in which memory should be allocated (can be NULL if 1488 HOWTO is SEARCH or MUST_FIND). */ 1489 1490 static struct elf_m68k_got_entry * 1491 elf_m68k_get_got_entry (struct elf_m68k_got *got, 1492 const struct elf_m68k_got_entry_key *key, 1493 enum elf_m68k_get_entry_howto howto, 1494 struct bfd_link_info *info) 1495 { 1496 struct elf_m68k_got_entry entry_; 1497 struct elf_m68k_got_entry *entry; 1498 void **ptr; 1499 1500 BFD_ASSERT ((info == NULL) == (howto == SEARCH || howto == MUST_FIND)); 1501 1502 if (got->entries == NULL) 1503 /* This is the first entry in ABFD. Initialize hashtable. */ 1504 { 1505 if (howto == SEARCH) 1506 return NULL; 1507 1508 got->entries = htab_try_create (ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT 1509 (info), 1510 elf_m68k_got_entry_hash, 1511 elf_m68k_got_entry_eq, NULL); 1512 if (got->entries == NULL) 1513 { 1514 bfd_set_error (bfd_error_no_memory); 1515 return NULL; 1516 } 1517 } 1518 1519 entry_.key_ = *key; 1520 ptr = htab_find_slot (got->entries, &entry_, (howto != SEARCH 1521 ? INSERT : NO_INSERT)); 1522 if (ptr == NULL) 1523 { 1524 if (howto == SEARCH) 1525 /* Entry not found. */ 1526 return NULL; 1527 1528 /* We're out of memory. */ 1529 bfd_set_error (bfd_error_no_memory); 1530 return NULL; 1531 } 1532 1533 if (*ptr == NULL) 1534 /* We didn't find the entry and we're asked to create a new one. */ 1535 { 1536 BFD_ASSERT (howto != MUST_FIND && howto != SEARCH); 1537 1538 entry = bfd_alloc (elf_hash_table (info)->dynobj, sizeof (*entry)); 1539 if (entry == NULL) 1540 return NULL; 1541 1542 /* Initialize new entry. */ 1543 entry->key_ = *key; 1544 1545 entry->u.s1.refcount = 0; 1546 1547 /* Mark the entry as not initialized. */ 1548 entry->key_.type = R_68K_max; 1549 1550 *ptr = entry; 1551 } 1552 else 1553 /* We found the entry. */ 1554 { 1555 BFD_ASSERT (howto != MUST_CREATE); 1556 1557 entry = *ptr; 1558 } 1559 1560 return entry; 1561 } 1562 1563 /* Update GOT counters when merging entry of WAS type with entry of NEW type. 1564 Return the value to which ENTRY's type should be set. */ 1565 1566 static enum elf_m68k_reloc_type 1567 elf_m68k_update_got_entry_type (struct elf_m68k_got *got, 1568 enum elf_m68k_reloc_type was, 1569 enum elf_m68k_reloc_type new_reloc) 1570 { 1571 enum elf_m68k_got_offset_size was_size; 1572 enum elf_m68k_got_offset_size new_size; 1573 bfd_vma n_slots; 1574 1575 if (was == R_68K_max) 1576 /* The type of the entry is not initialized yet. */ 1577 { 1578 /* Update all got->n_slots counters, including n_slots[R_32]. */ 1579 was_size = R_LAST; 1580 1581 was = new_reloc; 1582 } 1583 else 1584 { 1585 /* !!! We, probably, should emit an error rather then fail on assert 1586 in such a case. */ 1587 BFD_ASSERT (elf_m68k_reloc_got_type (was) 1588 == elf_m68k_reloc_got_type (new_reloc)); 1589 1590 was_size = elf_m68k_reloc_got_offset_size (was); 1591 } 1592 1593 new_size = elf_m68k_reloc_got_offset_size (new_reloc); 1594 n_slots = elf_m68k_reloc_got_n_slots (new_reloc); 1595 1596 while (was_size > new_size) 1597 { 1598 --was_size; 1599 got->n_slots[was_size] += n_slots; 1600 } 1601 1602 if (new_reloc > was) 1603 /* Relocations are ordered from bigger got offset size to lesser, 1604 so choose the relocation type with lesser offset size. */ 1605 was = new_reloc; 1606 1607 return was; 1608 } 1609 1610 /* Update GOT counters when removing an entry of type TYPE. */ 1611 1612 static void 1613 elf_m68k_remove_got_entry_type (struct elf_m68k_got *got, 1614 enum elf_m68k_reloc_type type) 1615 { 1616 enum elf_m68k_got_offset_size os; 1617 bfd_vma n_slots; 1618 1619 n_slots = elf_m68k_reloc_got_n_slots (type); 1620 1621 /* Decrese counter of slots with offset size corresponding to TYPE 1622 and all greater offset sizes. */ 1623 for (os = elf_m68k_reloc_got_offset_size (type); os <= R_32; ++os) 1624 { 1625 BFD_ASSERT (got->n_slots[os] >= n_slots); 1626 1627 got->n_slots[os] -= n_slots; 1628 } 1629 } 1630 1631 /* Add new or update existing entry to GOT. 1632 H, ABFD, TYPE and SYMNDX is data for the entry. 1633 INFO is a context where memory should be allocated. */ 1634 1635 static struct elf_m68k_got_entry * 1636 elf_m68k_add_entry_to_got (struct elf_m68k_got *got, 1637 struct elf_link_hash_entry *h, 1638 const bfd *abfd, 1639 enum elf_m68k_reloc_type reloc_type, 1640 unsigned long symndx, 1641 struct bfd_link_info *info) 1642 { 1643 struct elf_m68k_got_entry_key key_; 1644 struct elf_m68k_got_entry *entry; 1645 1646 if (h != NULL && elf_m68k_hash_entry (h)->got_entry_key == 0) 1647 elf_m68k_hash_entry (h)->got_entry_key 1648 = elf_m68k_multi_got (info)->global_symndx++; 1649 1650 elf_m68k_init_got_entry_key (&key_, h, abfd, symndx, reloc_type); 1651 1652 entry = elf_m68k_get_got_entry (got, &key_, FIND_OR_CREATE, info); 1653 if (entry == NULL) 1654 return NULL; 1655 1656 /* Determine entry's type and update got->n_slots counters. */ 1657 entry->key_.type = elf_m68k_update_got_entry_type (got, 1658 entry->key_.type, 1659 reloc_type); 1660 1661 /* Update refcount. */ 1662 ++entry->u.s1.refcount; 1663 1664 if (entry->u.s1.refcount == 1) 1665 /* We see this entry for the first time. */ 1666 { 1667 if (entry->key_.bfd != NULL) 1668 got->local_n_slots += elf_m68k_reloc_got_n_slots (entry->key_.type); 1669 } 1670 1671 BFD_ASSERT (got->n_slots[R_32] >= got->local_n_slots); 1672 1673 if ((got->n_slots[R_8] 1674 > ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info)) 1675 || (got->n_slots[R_16] 1676 > ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT (info))) 1677 /* This BFD has too many relocation. */ 1678 { 1679 if (got->n_slots[R_8] > ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info)) 1680 (*_bfd_error_handler) (_("%B: GOT overflow: " 1681 "Number of relocations with 8-bit " 1682 "offset > %d"), 1683 abfd, 1684 ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info)); 1685 else 1686 (*_bfd_error_handler) (_("%B: GOT overflow: " 1687 "Number of relocations with 8- or 16-bit " 1688 "offset > %d"), 1689 abfd, 1690 ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT (info)); 1691 1692 return NULL; 1693 } 1694 1695 return entry; 1696 } 1697 1698 /* Compute the hash value of the bfd in a bfd2got hash entry. */ 1699 1700 static hashval_t 1701 elf_m68k_bfd2got_entry_hash (const void *entry) 1702 { 1703 const struct elf_m68k_bfd2got_entry *e; 1704 1705 e = (const struct elf_m68k_bfd2got_entry *) entry; 1706 1707 return e->bfd->id; 1708 } 1709 1710 /* Check whether two hash entries have the same bfd. */ 1711 1712 static int 1713 elf_m68k_bfd2got_entry_eq (const void *entry1, const void *entry2) 1714 { 1715 const struct elf_m68k_bfd2got_entry *e1; 1716 const struct elf_m68k_bfd2got_entry *e2; 1717 1718 e1 = (const struct elf_m68k_bfd2got_entry *) entry1; 1719 e2 = (const struct elf_m68k_bfd2got_entry *) entry2; 1720 1721 return e1->bfd == e2->bfd; 1722 } 1723 1724 /* Destruct a bfd2got entry. */ 1725 1726 static void 1727 elf_m68k_bfd2got_entry_del (void *_entry) 1728 { 1729 struct elf_m68k_bfd2got_entry *entry; 1730 1731 entry = (struct elf_m68k_bfd2got_entry *) _entry; 1732 1733 BFD_ASSERT (entry->got != NULL); 1734 elf_m68k_clear_got (entry->got); 1735 } 1736 1737 /* Find existing or create new (depending on HOWTO) bfd2got entry in 1738 MULTI_GOT. ABFD is the bfd we need a GOT for. INFO is a context where 1739 memory should be allocated. */ 1740 1741 static struct elf_m68k_bfd2got_entry * 1742 elf_m68k_get_bfd2got_entry (struct elf_m68k_multi_got *multi_got, 1743 const bfd *abfd, 1744 enum elf_m68k_get_entry_howto howto, 1745 struct bfd_link_info *info) 1746 { 1747 struct elf_m68k_bfd2got_entry entry_; 1748 void **ptr; 1749 struct elf_m68k_bfd2got_entry *entry; 1750 1751 BFD_ASSERT ((info == NULL) == (howto == SEARCH || howto == MUST_FIND)); 1752 1753 if (multi_got->bfd2got == NULL) 1754 /* This is the first GOT. Initialize bfd2got. */ 1755 { 1756 if (howto == SEARCH) 1757 return NULL; 1758 1759 multi_got->bfd2got = htab_try_create (1, elf_m68k_bfd2got_entry_hash, 1760 elf_m68k_bfd2got_entry_eq, 1761 elf_m68k_bfd2got_entry_del); 1762 if (multi_got->bfd2got == NULL) 1763 { 1764 bfd_set_error (bfd_error_no_memory); 1765 return NULL; 1766 } 1767 } 1768 1769 entry_.bfd = abfd; 1770 ptr = htab_find_slot (multi_got->bfd2got, &entry_, (howto != SEARCH 1771 ? INSERT : NO_INSERT)); 1772 if (ptr == NULL) 1773 { 1774 if (howto == SEARCH) 1775 /* Entry not found. */ 1776 return NULL; 1777 1778 /* We're out of memory. */ 1779 bfd_set_error (bfd_error_no_memory); 1780 return NULL; 1781 } 1782 1783 if (*ptr == NULL) 1784 /* Entry was not found. Create new one. */ 1785 { 1786 BFD_ASSERT (howto != MUST_FIND && howto != SEARCH); 1787 1788 entry = ((struct elf_m68k_bfd2got_entry *) 1789 bfd_alloc (elf_hash_table (info)->dynobj, sizeof (*entry))); 1790 if (entry == NULL) 1791 return NULL; 1792 1793 entry->bfd = abfd; 1794 1795 entry->got = elf_m68k_create_empty_got (info); 1796 if (entry->got == NULL) 1797 return NULL; 1798 1799 *ptr = entry; 1800 } 1801 else 1802 { 1803 BFD_ASSERT (howto != MUST_CREATE); 1804 1805 /* Return existing entry. */ 1806 entry = *ptr; 1807 } 1808 1809 return entry; 1810 } 1811 1812 struct elf_m68k_can_merge_gots_arg 1813 { 1814 /* A current_got that we constructing a DIFF against. */ 1815 struct elf_m68k_got *big; 1816 1817 /* GOT holding entries not present or that should be changed in 1818 BIG. */ 1819 struct elf_m68k_got *diff; 1820 1821 /* Context where to allocate memory. */ 1822 struct bfd_link_info *info; 1823 1824 /* Error flag. */ 1825 bfd_boolean error_p; 1826 }; 1827 1828 /* Process a single entry from the small GOT to see if it should be added 1829 or updated in the big GOT. */ 1830 1831 static int 1832 elf_m68k_can_merge_gots_1 (void **_entry_ptr, void *_arg) 1833 { 1834 const struct elf_m68k_got_entry *entry1; 1835 struct elf_m68k_can_merge_gots_arg *arg; 1836 const struct elf_m68k_got_entry *entry2; 1837 enum elf_m68k_reloc_type type; 1838 1839 entry1 = (const struct elf_m68k_got_entry *) *_entry_ptr; 1840 arg = (struct elf_m68k_can_merge_gots_arg *) _arg; 1841 1842 entry2 = elf_m68k_get_got_entry (arg->big, &entry1->key_, SEARCH, NULL); 1843 1844 if (entry2 != NULL) 1845 /* We found an existing entry. Check if we should update it. */ 1846 { 1847 type = elf_m68k_update_got_entry_type (arg->diff, 1848 entry2->key_.type, 1849 entry1->key_.type); 1850 1851 if (type == entry2->key_.type) 1852 /* ENTRY1 doesn't update data in ENTRY2. Skip it. 1853 To skip creation of difference entry we use the type, 1854 which we won't see in GOT entries for sure. */ 1855 type = R_68K_max; 1856 } 1857 else 1858 /* We didn't find the entry. Add entry1 to DIFF. */ 1859 { 1860 BFD_ASSERT (entry1->key_.type != R_68K_max); 1861 1862 type = elf_m68k_update_got_entry_type (arg->diff, 1863 R_68K_max, entry1->key_.type); 1864 1865 if (entry1->key_.bfd != NULL) 1866 arg->diff->local_n_slots += elf_m68k_reloc_got_n_slots (type); 1867 } 1868 1869 if (type != R_68K_max) 1870 /* Create an entry in DIFF. */ 1871 { 1872 struct elf_m68k_got_entry *entry; 1873 1874 entry = elf_m68k_get_got_entry (arg->diff, &entry1->key_, MUST_CREATE, 1875 arg->info); 1876 if (entry == NULL) 1877 { 1878 arg->error_p = TRUE; 1879 return 0; 1880 } 1881 1882 entry->key_.type = type; 1883 } 1884 1885 return 1; 1886 } 1887 1888 /* Return TRUE if SMALL GOT can be added to BIG GOT without overflowing it. 1889 Construct DIFF GOT holding the entries which should be added or updated 1890 in BIG GOT to accumulate information from SMALL. 1891 INFO is the context where memory should be allocated. */ 1892 1893 static bfd_boolean 1894 elf_m68k_can_merge_gots (struct elf_m68k_got *big, 1895 const struct elf_m68k_got *small, 1896 struct bfd_link_info *info, 1897 struct elf_m68k_got *diff) 1898 { 1899 struct elf_m68k_can_merge_gots_arg arg_; 1900 1901 BFD_ASSERT (small->offset == (bfd_vma) -1); 1902 1903 arg_.big = big; 1904 arg_.diff = diff; 1905 arg_.info = info; 1906 arg_.error_p = FALSE; 1907 htab_traverse_noresize (small->entries, elf_m68k_can_merge_gots_1, &arg_); 1908 if (arg_.error_p) 1909 { 1910 diff->offset = 0; 1911 return FALSE; 1912 } 1913 1914 /* Check for overflow. */ 1915 if ((big->n_slots[R_8] + arg_.diff->n_slots[R_8] 1916 > ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info)) 1917 || (big->n_slots[R_16] + arg_.diff->n_slots[R_16] 1918 > ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT (info))) 1919 return FALSE; 1920 1921 return TRUE; 1922 } 1923 1924 struct elf_m68k_merge_gots_arg 1925 { 1926 /* The BIG got. */ 1927 struct elf_m68k_got *big; 1928 1929 /* Context where memory should be allocated. */ 1930 struct bfd_link_info *info; 1931 1932 /* Error flag. */ 1933 bfd_boolean error_p; 1934 }; 1935 1936 /* Process a single entry from DIFF got. Add or update corresponding 1937 entry in the BIG got. */ 1938 1939 static int 1940 elf_m68k_merge_gots_1 (void **entry_ptr, void *_arg) 1941 { 1942 const struct elf_m68k_got_entry *from; 1943 struct elf_m68k_merge_gots_arg *arg; 1944 struct elf_m68k_got_entry *to; 1945 1946 from = (const struct elf_m68k_got_entry *) *entry_ptr; 1947 arg = (struct elf_m68k_merge_gots_arg *) _arg; 1948 1949 to = elf_m68k_get_got_entry (arg->big, &from->key_, FIND_OR_CREATE, 1950 arg->info); 1951 if (to == NULL) 1952 { 1953 arg->error_p = TRUE; 1954 return 0; 1955 } 1956 1957 BFD_ASSERT (to->u.s1.refcount == 0); 1958 /* All we need to merge is TYPE. */ 1959 to->key_.type = from->key_.type; 1960 1961 return 1; 1962 } 1963 1964 /* Merge data from DIFF to BIG. INFO is context where memory should be 1965 allocated. */ 1966 1967 static bfd_boolean 1968 elf_m68k_merge_gots (struct elf_m68k_got *big, 1969 struct elf_m68k_got *diff, 1970 struct bfd_link_info *info) 1971 { 1972 if (diff->entries != NULL) 1973 /* DIFF is not empty. Merge it into BIG GOT. */ 1974 { 1975 struct elf_m68k_merge_gots_arg arg_; 1976 1977 /* Merge entries. */ 1978 arg_.big = big; 1979 arg_.info = info; 1980 arg_.error_p = FALSE; 1981 htab_traverse_noresize (diff->entries, elf_m68k_merge_gots_1, &arg_); 1982 if (arg_.error_p) 1983 return FALSE; 1984 1985 /* Merge counters. */ 1986 big->n_slots[R_8] += diff->n_slots[R_8]; 1987 big->n_slots[R_16] += diff->n_slots[R_16]; 1988 big->n_slots[R_32] += diff->n_slots[R_32]; 1989 big->local_n_slots += diff->local_n_slots; 1990 } 1991 else 1992 /* DIFF is empty. */ 1993 { 1994 BFD_ASSERT (diff->n_slots[R_8] == 0); 1995 BFD_ASSERT (diff->n_slots[R_16] == 0); 1996 BFD_ASSERT (diff->n_slots[R_32] == 0); 1997 BFD_ASSERT (diff->local_n_slots == 0); 1998 } 1999 2000 BFD_ASSERT (!elf_m68k_hash_table (info)->allow_multigot_p 2001 || ((big->n_slots[R_8] 2002 <= ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info)) 2003 && (big->n_slots[R_16] 2004 <= ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT (info)))); 2005 2006 return TRUE; 2007 } 2008 2009 struct elf_m68k_finalize_got_offsets_arg 2010 { 2011 /* Ranges of the offsets for GOT entries. 2012 R_x entries receive offsets between offset1[R_x] and offset2[R_x]. 2013 R_x is R_8, R_16 and R_32. */ 2014 bfd_vma *offset1; 2015 bfd_vma *offset2; 2016 2017 /* Mapping from global symndx to global symbols. 2018 This is used to build lists of got entries for global symbols. */ 2019 struct elf_m68k_link_hash_entry **symndx2h; 2020 2021 bfd_vma n_ldm_entries; 2022 }; 2023 2024 /* Assign ENTRY an offset. Build list of GOT entries for global symbols 2025 along the way. */ 2026 2027 static int 2028 elf_m68k_finalize_got_offsets_1 (void **entry_ptr, void *_arg) 2029 { 2030 struct elf_m68k_got_entry *entry; 2031 struct elf_m68k_finalize_got_offsets_arg *arg; 2032 2033 enum elf_m68k_got_offset_size got_offset_size; 2034 bfd_vma entry_size; 2035 2036 entry = (struct elf_m68k_got_entry *) *entry_ptr; 2037 arg = (struct elf_m68k_finalize_got_offsets_arg *) _arg; 2038 2039 /* This should be a fresh entry created in elf_m68k_can_merge_gots. */ 2040 BFD_ASSERT (entry->u.s1.refcount == 0); 2041 2042 /* Get GOT offset size for the entry . */ 2043 got_offset_size = elf_m68k_reloc_got_offset_size (entry->key_.type); 2044 2045 /* Calculate entry size in bytes. */ 2046 entry_size = 4 * elf_m68k_reloc_got_n_slots (entry->key_.type); 2047 2048 /* Check if we should switch to negative range of the offsets. */ 2049 if (arg->offset1[got_offset_size] + entry_size 2050 > arg->offset2[got_offset_size]) 2051 { 2052 /* Verify that this is the only switch to negative range for 2053 got_offset_size. If this assertion fails, then we've miscalculated 2054 range for got_offset_size entries in 2055 elf_m68k_finalize_got_offsets. */ 2056 BFD_ASSERT (arg->offset2[got_offset_size] 2057 != arg->offset2[-(int) got_offset_size - 1]); 2058 2059 /* Switch. */ 2060 arg->offset1[got_offset_size] = arg->offset1[-(int) got_offset_size - 1]; 2061 arg->offset2[got_offset_size] = arg->offset2[-(int) got_offset_size - 1]; 2062 2063 /* Verify that now we have enough room for the entry. */ 2064 BFD_ASSERT (arg->offset1[got_offset_size] + entry_size 2065 <= arg->offset2[got_offset_size]); 2066 } 2067 2068 /* Assign offset to entry. */ 2069 entry->u.s2.offset = arg->offset1[got_offset_size]; 2070 arg->offset1[got_offset_size] += entry_size; 2071 2072 if (entry->key_.bfd == NULL) 2073 /* Hook up this entry into the list of got_entries of H. */ 2074 { 2075 struct elf_m68k_link_hash_entry *h; 2076 2077 h = arg->symndx2h[entry->key_.symndx]; 2078 if (h != NULL) 2079 { 2080 entry->u.s2.next = h->glist; 2081 h->glist = entry; 2082 } 2083 else 2084 /* This should be the entry for TLS_LDM relocation then. */ 2085 { 2086 BFD_ASSERT ((elf_m68k_reloc_got_type (entry->key_.type) 2087 == R_68K_TLS_LDM32) 2088 && entry->key_.symndx == 0); 2089 2090 ++arg->n_ldm_entries; 2091 } 2092 } 2093 else 2094 /* This entry is for local symbol. */ 2095 entry->u.s2.next = NULL; 2096 2097 return 1; 2098 } 2099 2100 /* Assign offsets within GOT. USE_NEG_GOT_OFFSETS_P indicates if we 2101 should use negative offsets. 2102 Build list of GOT entries for global symbols along the way. 2103 SYMNDX2H is mapping from global symbol indices to actual 2104 global symbols. 2105 Return offset at which next GOT should start. */ 2106 2107 static void 2108 elf_m68k_finalize_got_offsets (struct elf_m68k_got *got, 2109 bfd_boolean use_neg_got_offsets_p, 2110 struct elf_m68k_link_hash_entry **symndx2h, 2111 bfd_vma *final_offset, bfd_vma *n_ldm_entries) 2112 { 2113 struct elf_m68k_finalize_got_offsets_arg arg_; 2114 bfd_vma offset1_[2 * R_LAST]; 2115 bfd_vma offset2_[2 * R_LAST]; 2116 int i; 2117 bfd_vma start_offset; 2118 2119 BFD_ASSERT (got->offset != (bfd_vma) -1); 2120 2121 /* We set entry offsets relative to the .got section (and not the 2122 start of a particular GOT), so that we can use them in 2123 finish_dynamic_symbol without needing to know the GOT which they come 2124 from. */ 2125 2126 /* Put offset1 in the middle of offset1_, same for offset2. */ 2127 arg_.offset1 = offset1_ + R_LAST; 2128 arg_.offset2 = offset2_ + R_LAST; 2129 2130 start_offset = got->offset; 2131 2132 if (use_neg_got_offsets_p) 2133 /* Setup both negative and positive ranges for R_8, R_16 and R_32. */ 2134 i = -(int) R_32 - 1; 2135 else 2136 /* Setup positives ranges for R_8, R_16 and R_32. */ 2137 i = (int) R_8; 2138 2139 for (; i <= (int) R_32; ++i) 2140 { 2141 int j; 2142 size_t n; 2143 2144 /* Set beginning of the range of offsets I. */ 2145 arg_.offset1[i] = start_offset; 2146 2147 /* Calculate number of slots that require I offsets. */ 2148 j = (i >= 0) ? i : -i - 1; 2149 n = (j >= 1) ? got->n_slots[j - 1] : 0; 2150 n = got->n_slots[j] - n; 2151 2152 if (use_neg_got_offsets_p && n != 0) 2153 { 2154 if (i < 0) 2155 /* We first fill the positive side of the range, so we might 2156 end up with one empty slot at that side when we can't fit 2157 whole 2-slot entry. Account for that at negative side of 2158 the interval with one additional entry. */ 2159 n = n / 2 + 1; 2160 else 2161 /* When the number of slots is odd, make positive side of the 2162 range one entry bigger. */ 2163 n = (n + 1) / 2; 2164 } 2165 2166 /* N is the number of slots that require I offsets. 2167 Calculate length of the range for I offsets. */ 2168 n = 4 * n; 2169 2170 /* Set end of the range. */ 2171 arg_.offset2[i] = start_offset + n; 2172 2173 start_offset = arg_.offset2[i]; 2174 } 2175 2176 if (!use_neg_got_offsets_p) 2177 /* Make sure that if we try to switch to negative offsets in 2178 elf_m68k_finalize_got_offsets_1, the assert therein will catch 2179 the bug. */ 2180 for (i = R_8; i <= R_32; ++i) 2181 arg_.offset2[-i - 1] = arg_.offset2[i]; 2182 2183 /* Setup got->offset. offset1[R_8] is either in the middle or at the 2184 beginning of GOT depending on use_neg_got_offsets_p. */ 2185 got->offset = arg_.offset1[R_8]; 2186 2187 arg_.symndx2h = symndx2h; 2188 arg_.n_ldm_entries = 0; 2189 2190 /* Assign offsets. */ 2191 htab_traverse (got->entries, elf_m68k_finalize_got_offsets_1, &arg_); 2192 2193 /* Check offset ranges we have actually assigned. */ 2194 for (i = (int) R_8; i <= (int) R_32; ++i) 2195 BFD_ASSERT (arg_.offset2[i] - arg_.offset1[i] <= 4); 2196 2197 *final_offset = start_offset; 2198 *n_ldm_entries = arg_.n_ldm_entries; 2199 } 2200 2201 struct elf_m68k_partition_multi_got_arg 2202 { 2203 /* The GOT we are adding entries to. Aka big got. */ 2204 struct elf_m68k_got *current_got; 2205 2206 /* Offset to assign the next CURRENT_GOT. */ 2207 bfd_vma offset; 2208 2209 /* Context where memory should be allocated. */ 2210 struct bfd_link_info *info; 2211 2212 /* Total number of slots in the .got section. 2213 This is used to calculate size of the .got and .rela.got sections. */ 2214 bfd_vma n_slots; 2215 2216 /* Difference in numbers of allocated slots in the .got section 2217 and necessary relocations in the .rela.got section. 2218 This is used to calculate size of the .rela.got section. */ 2219 bfd_vma slots_relas_diff; 2220 2221 /* Error flag. */ 2222 bfd_boolean error_p; 2223 2224 /* Mapping from global symndx to global symbols. 2225 This is used to build lists of got entries for global symbols. */ 2226 struct elf_m68k_link_hash_entry **symndx2h; 2227 }; 2228 2229 static void 2230 elf_m68k_partition_multi_got_2 (struct elf_m68k_partition_multi_got_arg *arg) 2231 { 2232 bfd_vma n_ldm_entries; 2233 2234 elf_m68k_finalize_got_offsets (arg->current_got, 2235 (elf_m68k_hash_table (arg->info) 2236 ->use_neg_got_offsets_p), 2237 arg->symndx2h, 2238 &arg->offset, &n_ldm_entries); 2239 2240 arg->n_slots += arg->current_got->n_slots[R_32]; 2241 2242 if (!arg->info->shared) 2243 /* If we are generating a shared object, we need to 2244 output a R_68K_RELATIVE reloc so that the dynamic 2245 linker can adjust this GOT entry. Overwise we 2246 don't need space in .rela.got for local symbols. */ 2247 arg->slots_relas_diff += arg->current_got->local_n_slots; 2248 2249 /* @LDM relocations require a 2-slot GOT entry, but only 2250 one relocation. Account for that. */ 2251 arg->slots_relas_diff += n_ldm_entries; 2252 2253 BFD_ASSERT (arg->slots_relas_diff <= arg->n_slots); 2254 } 2255 2256 2257 /* Process a single BFD2GOT entry and either merge GOT to CURRENT_GOT 2258 or start a new CURRENT_GOT. */ 2259 2260 static int 2261 elf_m68k_partition_multi_got_1 (void **_entry, void *_arg) 2262 { 2263 struct elf_m68k_bfd2got_entry *entry; 2264 struct elf_m68k_partition_multi_got_arg *arg; 2265 struct elf_m68k_got *got; 2266 struct elf_m68k_got diff_; 2267 struct elf_m68k_got *diff; 2268 2269 entry = (struct elf_m68k_bfd2got_entry *) *_entry; 2270 arg = (struct elf_m68k_partition_multi_got_arg *) _arg; 2271 2272 got = entry->got; 2273 BFD_ASSERT (got != NULL); 2274 BFD_ASSERT (got->offset == (bfd_vma) -1); 2275 2276 diff = NULL; 2277 2278 if (arg->current_got != NULL) 2279 /* Construct diff. */ 2280 { 2281 diff = &diff_; 2282 elf_m68k_init_got (diff); 2283 2284 if (!elf_m68k_can_merge_gots (arg->current_got, got, arg->info, diff)) 2285 { 2286 if (diff->offset == 0) 2287 /* Offset set to 0 in the diff_ indicates an error. */ 2288 { 2289 arg->error_p = TRUE; 2290 goto final_return; 2291 } 2292 2293 if (elf_m68k_hash_table (arg->info)->allow_multigot_p) 2294 { 2295 elf_m68k_clear_got (diff); 2296 /* Schedule to finish up current_got and start new one. */ 2297 diff = NULL; 2298 } 2299 /* else 2300 Merge GOTs no matter what. If big GOT overflows, 2301 we'll fail in relocate_section due to truncated relocations. 2302 2303 ??? May be fail earlier? E.g., in can_merge_gots. */ 2304 } 2305 } 2306 else 2307 /* Diff of got against empty current_got is got itself. */ 2308 { 2309 /* Create empty current_got to put subsequent GOTs to. */ 2310 arg->current_got = elf_m68k_create_empty_got (arg->info); 2311 if (arg->current_got == NULL) 2312 { 2313 arg->error_p = TRUE; 2314 goto final_return; 2315 } 2316 2317 arg->current_got->offset = arg->offset; 2318 2319 diff = got; 2320 } 2321 2322 if (diff != NULL) 2323 { 2324 if (!elf_m68k_merge_gots (arg->current_got, diff, arg->info)) 2325 { 2326 arg->error_p = TRUE; 2327 goto final_return; 2328 } 2329 2330 /* Now we can free GOT. */ 2331 elf_m68k_clear_got (got); 2332 2333 entry->got = arg->current_got; 2334 } 2335 else 2336 { 2337 /* Finish up current_got. */ 2338 elf_m68k_partition_multi_got_2 (arg); 2339 2340 /* Schedule to start a new current_got. */ 2341 arg->current_got = NULL; 2342 2343 /* Retry. */ 2344 if (!elf_m68k_partition_multi_got_1 (_entry, _arg)) 2345 { 2346 BFD_ASSERT (arg->error_p); 2347 goto final_return; 2348 } 2349 } 2350 2351 final_return: 2352 if (diff != NULL) 2353 elf_m68k_clear_got (diff); 2354 2355 return arg->error_p == FALSE ? 1 : 0; 2356 } 2357 2358 /* Helper function to build symndx2h mapping. */ 2359 2360 static bfd_boolean 2361 elf_m68k_init_symndx2h_1 (struct elf_link_hash_entry *_h, 2362 void *_arg) 2363 { 2364 struct elf_m68k_link_hash_entry *h; 2365 2366 h = elf_m68k_hash_entry (_h); 2367 2368 if (h->got_entry_key != 0) 2369 /* H has at least one entry in the GOT. */ 2370 { 2371 struct elf_m68k_partition_multi_got_arg *arg; 2372 2373 arg = (struct elf_m68k_partition_multi_got_arg *) _arg; 2374 2375 BFD_ASSERT (arg->symndx2h[h->got_entry_key] == NULL); 2376 arg->symndx2h[h->got_entry_key] = h; 2377 } 2378 2379 return TRUE; 2380 } 2381 2382 /* Merge GOTs of some BFDs, assign offsets to GOT entries and build 2383 lists of GOT entries for global symbols. 2384 Calculate sizes of .got and .rela.got sections. */ 2385 2386 static bfd_boolean 2387 elf_m68k_partition_multi_got (struct bfd_link_info *info) 2388 { 2389 struct elf_m68k_multi_got *multi_got; 2390 struct elf_m68k_partition_multi_got_arg arg_; 2391 2392 multi_got = elf_m68k_multi_got (info); 2393 2394 arg_.current_got = NULL; 2395 arg_.offset = 0; 2396 arg_.info = info; 2397 arg_.n_slots = 0; 2398 arg_.slots_relas_diff = 0; 2399 arg_.error_p = FALSE; 2400 2401 if (multi_got->bfd2got != NULL) 2402 { 2403 /* Initialize symndx2h mapping. */ 2404 { 2405 arg_.symndx2h = bfd_zmalloc (multi_got->global_symndx 2406 * sizeof (*arg_.symndx2h)); 2407 if (arg_.symndx2h == NULL) 2408 return FALSE; 2409 2410 elf_link_hash_traverse (elf_hash_table (info), 2411 elf_m68k_init_symndx2h_1, &arg_); 2412 } 2413 2414 /* Partition. */ 2415 htab_traverse (multi_got->bfd2got, elf_m68k_partition_multi_got_1, 2416 &arg_); 2417 if (arg_.error_p) 2418 { 2419 free (arg_.symndx2h); 2420 arg_.symndx2h = NULL; 2421 2422 return FALSE; 2423 } 2424 2425 /* Finish up last current_got. */ 2426 elf_m68k_partition_multi_got_2 (&arg_); 2427 2428 free (arg_.symndx2h); 2429 } 2430 2431 if (elf_hash_table (info)->dynobj != NULL) 2432 /* Set sizes of .got and .rela.got sections. */ 2433 { 2434 asection *s; 2435 2436 s = bfd_get_linker_section (elf_hash_table (info)->dynobj, ".got"); 2437 if (s != NULL) 2438 s->size = arg_.offset; 2439 else 2440 BFD_ASSERT (arg_.offset == 0); 2441 2442 BFD_ASSERT (arg_.slots_relas_diff <= arg_.n_slots); 2443 arg_.n_slots -= arg_.slots_relas_diff; 2444 2445 s = bfd_get_linker_section (elf_hash_table (info)->dynobj, ".rela.got"); 2446 if (s != NULL) 2447 s->size = arg_.n_slots * sizeof (Elf32_External_Rela); 2448 else 2449 BFD_ASSERT (arg_.n_slots == 0); 2450 } 2451 else 2452 BFD_ASSERT (multi_got->bfd2got == NULL); 2453 2454 return TRUE; 2455 } 2456 2457 /* Specialized version of elf_m68k_get_got_entry that returns pointer 2458 to hashtable slot, thus allowing removal of entry via 2459 elf_m68k_remove_got_entry. */ 2460 2461 static struct elf_m68k_got_entry ** 2462 elf_m68k_find_got_entry_ptr (struct elf_m68k_got *got, 2463 struct elf_m68k_got_entry_key *key) 2464 { 2465 void **ptr; 2466 struct elf_m68k_got_entry entry_; 2467 struct elf_m68k_got_entry **entry_ptr; 2468 2469 entry_.key_ = *key; 2470 ptr = htab_find_slot (got->entries, &entry_, NO_INSERT); 2471 BFD_ASSERT (ptr != NULL); 2472 2473 entry_ptr = (struct elf_m68k_got_entry **) ptr; 2474 2475 return entry_ptr; 2476 } 2477 2478 /* Remove entry pointed to by ENTRY_PTR from GOT. */ 2479 2480 static void 2481 elf_m68k_remove_got_entry (struct elf_m68k_got *got, 2482 struct elf_m68k_got_entry **entry_ptr) 2483 { 2484 struct elf_m68k_got_entry *entry; 2485 2486 entry = *entry_ptr; 2487 2488 /* Check that offsets have not been finalized yet. */ 2489 BFD_ASSERT (got->offset == (bfd_vma) -1); 2490 /* Check that this entry is indeed unused. */ 2491 BFD_ASSERT (entry->u.s1.refcount == 0); 2492 2493 elf_m68k_remove_got_entry_type (got, entry->key_.type); 2494 2495 if (entry->key_.bfd != NULL) 2496 got->local_n_slots -= elf_m68k_reloc_got_n_slots (entry->key_.type); 2497 2498 BFD_ASSERT (got->n_slots[R_32] >= got->local_n_slots); 2499 2500 htab_clear_slot (got->entries, (void **) entry_ptr); 2501 } 2502 2503 /* Copy any information related to dynamic linking from a pre-existing 2504 symbol to a newly created symbol. Also called to copy flags and 2505 other back-end info to a weakdef, in which case the symbol is not 2506 newly created and plt/got refcounts and dynamic indices should not 2507 be copied. */ 2508 2509 static void 2510 elf_m68k_copy_indirect_symbol (struct bfd_link_info *info, 2511 struct elf_link_hash_entry *_dir, 2512 struct elf_link_hash_entry *_ind) 2513 { 2514 struct elf_m68k_link_hash_entry *dir; 2515 struct elf_m68k_link_hash_entry *ind; 2516 2517 _bfd_elf_link_hash_copy_indirect (info, _dir, _ind); 2518 2519 if (_ind->root.type != bfd_link_hash_indirect) 2520 return; 2521 2522 dir = elf_m68k_hash_entry (_dir); 2523 ind = elf_m68k_hash_entry (_ind); 2524 2525 /* Any absolute non-dynamic relocations against an indirect or weak 2526 definition will be against the target symbol. */ 2527 _dir->non_got_ref |= _ind->non_got_ref; 2528 2529 /* We might have a direct symbol already having entries in the GOTs. 2530 Update its key only in case indirect symbol has GOT entries and 2531 assert that both indirect and direct symbols don't have GOT entries 2532 at the same time. */ 2533 if (ind->got_entry_key != 0) 2534 { 2535 BFD_ASSERT (dir->got_entry_key == 0); 2536 /* Assert that GOTs aren't partitioned yet. */ 2537 BFD_ASSERT (ind->glist == NULL); 2538 2539 dir->got_entry_key = ind->got_entry_key; 2540 ind->got_entry_key = 0; 2541 } 2542 } 2543 2544 /* Look through the relocs for a section during the first phase, and 2545 allocate space in the global offset table or procedure linkage 2546 table. */ 2547 2548 static bfd_boolean 2549 elf_m68k_check_relocs (bfd *abfd, 2550 struct bfd_link_info *info, 2551 asection *sec, 2552 const Elf_Internal_Rela *relocs) 2553 { 2554 bfd *dynobj; 2555 Elf_Internal_Shdr *symtab_hdr; 2556 struct elf_link_hash_entry **sym_hashes; 2557 const Elf_Internal_Rela *rel; 2558 const Elf_Internal_Rela *rel_end; 2559 asection *sgot; 2560 asection *srelgot; 2561 asection *sreloc; 2562 struct elf_m68k_got *got; 2563 2564 if (info->relocatable) 2565 return TRUE; 2566 2567 dynobj = elf_hash_table (info)->dynobj; 2568 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 2569 sym_hashes = elf_sym_hashes (abfd); 2570 2571 sgot = NULL; 2572 srelgot = NULL; 2573 sreloc = NULL; 2574 2575 got = NULL; 2576 2577 rel_end = relocs + sec->reloc_count; 2578 for (rel = relocs; rel < rel_end; rel++) 2579 { 2580 unsigned long r_symndx; 2581 struct elf_link_hash_entry *h; 2582 2583 r_symndx = ELF32_R_SYM (rel->r_info); 2584 2585 if (r_symndx < symtab_hdr->sh_info) 2586 h = NULL; 2587 else 2588 { 2589 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 2590 while (h->root.type == bfd_link_hash_indirect 2591 || h->root.type == bfd_link_hash_warning) 2592 h = (struct elf_link_hash_entry *) h->root.u.i.link; 2593 } 2594 2595 switch (ELF32_R_TYPE (rel->r_info)) 2596 { 2597 case R_68K_GOT8: 2598 case R_68K_GOT16: 2599 case R_68K_GOT32: 2600 if (h != NULL 2601 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) 2602 break; 2603 /* Fall through. */ 2604 2605 /* Relative GOT relocations. */ 2606 case R_68K_GOT8O: 2607 case R_68K_GOT16O: 2608 case R_68K_GOT32O: 2609 /* Fall through. */ 2610 2611 /* TLS relocations. */ 2612 case R_68K_TLS_GD8: 2613 case R_68K_TLS_GD16: 2614 case R_68K_TLS_GD32: 2615 case R_68K_TLS_LDM8: 2616 case R_68K_TLS_LDM16: 2617 case R_68K_TLS_LDM32: 2618 case R_68K_TLS_IE8: 2619 case R_68K_TLS_IE16: 2620 case R_68K_TLS_IE32: 2621 2622 case R_68K_TLS_TPREL32: 2623 case R_68K_TLS_DTPREL32: 2624 2625 if (ELF32_R_TYPE (rel->r_info) == R_68K_TLS_TPREL32 2626 && info->shared) 2627 /* Do the special chorus for libraries with static TLS. */ 2628 info->flags |= DF_STATIC_TLS; 2629 2630 /* This symbol requires a global offset table entry. */ 2631 2632 if (dynobj == NULL) 2633 { 2634 /* Create the .got section. */ 2635 elf_hash_table (info)->dynobj = dynobj = abfd; 2636 if (!_bfd_elf_create_got_section (dynobj, info)) 2637 return FALSE; 2638 } 2639 2640 if (sgot == NULL) 2641 { 2642 sgot = bfd_get_linker_section (dynobj, ".got"); 2643 BFD_ASSERT (sgot != NULL); 2644 } 2645 2646 if (srelgot == NULL 2647 && (h != NULL || info->shared)) 2648 { 2649 srelgot = bfd_get_linker_section (dynobj, ".rela.got"); 2650 if (srelgot == NULL) 2651 { 2652 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS 2653 | SEC_IN_MEMORY | SEC_LINKER_CREATED 2654 | SEC_READONLY); 2655 srelgot = bfd_make_section_anyway_with_flags (dynobj, 2656 ".rela.got", 2657 flags); 2658 if (srelgot == NULL 2659 || !bfd_set_section_alignment (dynobj, srelgot, 2)) 2660 return FALSE; 2661 } 2662 } 2663 2664 if (got == NULL) 2665 { 2666 struct elf_m68k_bfd2got_entry *bfd2got_entry; 2667 2668 bfd2got_entry 2669 = elf_m68k_get_bfd2got_entry (elf_m68k_multi_got (info), 2670 abfd, FIND_OR_CREATE, info); 2671 if (bfd2got_entry == NULL) 2672 return FALSE; 2673 2674 got = bfd2got_entry->got; 2675 BFD_ASSERT (got != NULL); 2676 } 2677 2678 { 2679 struct elf_m68k_got_entry *got_entry; 2680 2681 /* Add entry to got. */ 2682 got_entry = elf_m68k_add_entry_to_got (got, h, abfd, 2683 ELF32_R_TYPE (rel->r_info), 2684 r_symndx, info); 2685 if (got_entry == NULL) 2686 return FALSE; 2687 2688 if (got_entry->u.s1.refcount == 1) 2689 { 2690 /* Make sure this symbol is output as a dynamic symbol. */ 2691 if (h != NULL 2692 && h->dynindx == -1 2693 && !h->forced_local) 2694 { 2695 if (!bfd_elf_link_record_dynamic_symbol (info, h)) 2696 return FALSE; 2697 } 2698 } 2699 } 2700 2701 break; 2702 2703 case R_68K_PLT8: 2704 case R_68K_PLT16: 2705 case R_68K_PLT32: 2706 /* This symbol requires a procedure linkage table entry. We 2707 actually build the entry in adjust_dynamic_symbol, 2708 because this might be a case of linking PIC code which is 2709 never referenced by a dynamic object, in which case we 2710 don't need to generate a procedure linkage table entry 2711 after all. */ 2712 2713 /* If this is a local symbol, we resolve it directly without 2714 creating a procedure linkage table entry. */ 2715 if (h == NULL) 2716 continue; 2717 2718 h->needs_plt = 1; 2719 h->plt.refcount++; 2720 break; 2721 2722 case R_68K_PLT8O: 2723 case R_68K_PLT16O: 2724 case R_68K_PLT32O: 2725 /* This symbol requires a procedure linkage table entry. */ 2726 2727 if (h == NULL) 2728 { 2729 /* It does not make sense to have this relocation for a 2730 local symbol. FIXME: does it? How to handle it if 2731 it does make sense? */ 2732 bfd_set_error (bfd_error_bad_value); 2733 return FALSE; 2734 } 2735 2736 /* Make sure this symbol is output as a dynamic symbol. */ 2737 if (h->dynindx == -1 2738 && !h->forced_local) 2739 { 2740 if (!bfd_elf_link_record_dynamic_symbol (info, h)) 2741 return FALSE; 2742 } 2743 2744 h->needs_plt = 1; 2745 h->plt.refcount++; 2746 break; 2747 2748 case R_68K_PC8: 2749 case R_68K_PC16: 2750 case R_68K_PC32: 2751 /* If we are creating a shared library and this is not a local 2752 symbol, we need to copy the reloc into the shared library. 2753 However when linking with -Bsymbolic and this is a global 2754 symbol which is defined in an object we are including in the 2755 link (i.e., DEF_REGULAR is set), then we can resolve the 2756 reloc directly. At this point we have not seen all the input 2757 files, so it is possible that DEF_REGULAR is not set now but 2758 will be set later (it is never cleared). We account for that 2759 possibility below by storing information in the 2760 pcrel_relocs_copied field of the hash table entry. */ 2761 if (!(info->shared 2762 && (sec->flags & SEC_ALLOC) != 0 2763 && h != NULL 2764 && (!info->symbolic 2765 || h->root.type == bfd_link_hash_defweak 2766 || !h->def_regular))) 2767 { 2768 if (h != NULL) 2769 { 2770 /* Make sure a plt entry is created for this symbol if 2771 it turns out to be a function defined by a dynamic 2772 object. */ 2773 h->plt.refcount++; 2774 } 2775 break; 2776 } 2777 /* Fall through. */ 2778 case R_68K_8: 2779 case R_68K_16: 2780 case R_68K_32: 2781 /* We don't need to handle relocs into sections not going into 2782 the "real" output. */ 2783 if ((sec->flags & SEC_ALLOC) == 0) 2784 break; 2785 2786 if (h != NULL) 2787 { 2788 /* Make sure a plt entry is created for this symbol if it 2789 turns out to be a function defined by a dynamic object. */ 2790 h->plt.refcount++; 2791 2792 if (info->executable) 2793 /* This symbol needs a non-GOT reference. */ 2794 h->non_got_ref = 1; 2795 } 2796 2797 /* If we are creating a shared library, we need to copy the 2798 reloc into the shared library. */ 2799 if (info->shared) 2800 { 2801 /* When creating a shared object, we must copy these 2802 reloc types into the output file. We create a reloc 2803 section in dynobj and make room for this reloc. */ 2804 if (sreloc == NULL) 2805 { 2806 sreloc = _bfd_elf_make_dynamic_reloc_section 2807 (sec, dynobj, 2, abfd, /*rela?*/ TRUE); 2808 2809 if (sreloc == NULL) 2810 return FALSE; 2811 } 2812 2813 if (sec->flags & SEC_READONLY 2814 /* Don't set DF_TEXTREL yet for PC relative 2815 relocations, they might be discarded later. */ 2816 && !(ELF32_R_TYPE (rel->r_info) == R_68K_PC8 2817 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16 2818 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32)) 2819 info->flags |= DF_TEXTREL; 2820 2821 sreloc->size += sizeof (Elf32_External_Rela); 2822 2823 /* We count the number of PC relative relocations we have 2824 entered for this symbol, so that we can discard them 2825 again if, in the -Bsymbolic case, the symbol is later 2826 defined by a regular object, or, in the normal shared 2827 case, the symbol is forced to be local. Note that this 2828 function is only called if we are using an m68kelf linker 2829 hash table, which means that h is really a pointer to an 2830 elf_m68k_link_hash_entry. */ 2831 if (ELF32_R_TYPE (rel->r_info) == R_68K_PC8 2832 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16 2833 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32) 2834 { 2835 struct elf_m68k_pcrel_relocs_copied *p; 2836 struct elf_m68k_pcrel_relocs_copied **head; 2837 2838 if (h != NULL) 2839 { 2840 struct elf_m68k_link_hash_entry *eh 2841 = elf_m68k_hash_entry (h); 2842 head = &eh->pcrel_relocs_copied; 2843 } 2844 else 2845 { 2846 asection *s; 2847 void *vpp; 2848 Elf_Internal_Sym *isym; 2849 2850 isym = bfd_sym_from_r_symndx (&elf_m68k_hash_table (info)->sym_cache, 2851 abfd, r_symndx); 2852 if (isym == NULL) 2853 return FALSE; 2854 2855 s = bfd_section_from_elf_index (abfd, isym->st_shndx); 2856 if (s == NULL) 2857 s = sec; 2858 2859 vpp = &elf_section_data (s)->local_dynrel; 2860 head = (struct elf_m68k_pcrel_relocs_copied **) vpp; 2861 } 2862 2863 for (p = *head; p != NULL; p = p->next) 2864 if (p->section == sreloc) 2865 break; 2866 2867 if (p == NULL) 2868 { 2869 p = ((struct elf_m68k_pcrel_relocs_copied *) 2870 bfd_alloc (dynobj, (bfd_size_type) sizeof *p)); 2871 if (p == NULL) 2872 return FALSE; 2873 p->next = *head; 2874 *head = p; 2875 p->section = sreloc; 2876 p->count = 0; 2877 } 2878 2879 ++p->count; 2880 } 2881 } 2882 2883 break; 2884 2885 /* This relocation describes the C++ object vtable hierarchy. 2886 Reconstruct it for later use during GC. */ 2887 case R_68K_GNU_VTINHERIT: 2888 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 2889 return FALSE; 2890 break; 2891 2892 /* This relocation describes which C++ vtable entries are actually 2893 used. Record for later use during GC. */ 2894 case R_68K_GNU_VTENTRY: 2895 BFD_ASSERT (h != NULL); 2896 if (h != NULL 2897 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 2898 return FALSE; 2899 break; 2900 2901 default: 2902 break; 2903 } 2904 } 2905 2906 return TRUE; 2907 } 2908 2909 /* Return the section that should be marked against GC for a given 2910 relocation. */ 2911 2912 static asection * 2913 elf_m68k_gc_mark_hook (asection *sec, 2914 struct bfd_link_info *info, 2915 Elf_Internal_Rela *rel, 2916 struct elf_link_hash_entry *h, 2917 Elf_Internal_Sym *sym) 2918 { 2919 if (h != NULL) 2920 switch (ELF32_R_TYPE (rel->r_info)) 2921 { 2922 case R_68K_GNU_VTINHERIT: 2923 case R_68K_GNU_VTENTRY: 2924 return NULL; 2925 } 2926 2927 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 2928 } 2929 2930 /* Update the got entry reference counts for the section being removed. */ 2931 2932 static bfd_boolean 2933 elf_m68k_gc_sweep_hook (bfd *abfd, 2934 struct bfd_link_info *info, 2935 asection *sec, 2936 const Elf_Internal_Rela *relocs) 2937 { 2938 Elf_Internal_Shdr *symtab_hdr; 2939 struct elf_link_hash_entry **sym_hashes; 2940 const Elf_Internal_Rela *rel, *relend; 2941 bfd *dynobj; 2942 struct elf_m68k_got *got; 2943 2944 if (info->relocatable) 2945 return TRUE; 2946 2947 dynobj = elf_hash_table (info)->dynobj; 2948 if (dynobj == NULL) 2949 return TRUE; 2950 2951 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 2952 sym_hashes = elf_sym_hashes (abfd); 2953 got = NULL; 2954 2955 relend = relocs + sec->reloc_count; 2956 for (rel = relocs; rel < relend; rel++) 2957 { 2958 unsigned long r_symndx; 2959 struct elf_link_hash_entry *h = NULL; 2960 2961 r_symndx = ELF32_R_SYM (rel->r_info); 2962 if (r_symndx >= symtab_hdr->sh_info) 2963 { 2964 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 2965 while (h->root.type == bfd_link_hash_indirect 2966 || h->root.type == bfd_link_hash_warning) 2967 h = (struct elf_link_hash_entry *) h->root.u.i.link; 2968 } 2969 2970 switch (ELF32_R_TYPE (rel->r_info)) 2971 { 2972 case R_68K_GOT8: 2973 case R_68K_GOT16: 2974 case R_68K_GOT32: 2975 if (h != NULL 2976 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) 2977 break; 2978 2979 /* FALLTHRU */ 2980 case R_68K_GOT8O: 2981 case R_68K_GOT16O: 2982 case R_68K_GOT32O: 2983 /* Fall through. */ 2984 2985 /* TLS relocations. */ 2986 case R_68K_TLS_GD8: 2987 case R_68K_TLS_GD16: 2988 case R_68K_TLS_GD32: 2989 case R_68K_TLS_LDM8: 2990 case R_68K_TLS_LDM16: 2991 case R_68K_TLS_LDM32: 2992 case R_68K_TLS_IE8: 2993 case R_68K_TLS_IE16: 2994 case R_68K_TLS_IE32: 2995 2996 case R_68K_TLS_TPREL32: 2997 case R_68K_TLS_DTPREL32: 2998 2999 if (got == NULL) 3000 { 3001 got = elf_m68k_get_bfd2got_entry (elf_m68k_multi_got (info), 3002 abfd, MUST_FIND, NULL)->got; 3003 BFD_ASSERT (got != NULL); 3004 } 3005 3006 { 3007 struct elf_m68k_got_entry_key key_; 3008 struct elf_m68k_got_entry **got_entry_ptr; 3009 struct elf_m68k_got_entry *got_entry; 3010 3011 elf_m68k_init_got_entry_key (&key_, h, abfd, r_symndx, 3012 ELF32_R_TYPE (rel->r_info)); 3013 got_entry_ptr = elf_m68k_find_got_entry_ptr (got, &key_); 3014 3015 got_entry = *got_entry_ptr; 3016 3017 if (got_entry->u.s1.refcount > 0) 3018 { 3019 --got_entry->u.s1.refcount; 3020 3021 if (got_entry->u.s1.refcount == 0) 3022 /* We don't need the .got entry any more. */ 3023 elf_m68k_remove_got_entry (got, got_entry_ptr); 3024 } 3025 } 3026 break; 3027 3028 case R_68K_PLT8: 3029 case R_68K_PLT16: 3030 case R_68K_PLT32: 3031 case R_68K_PLT8O: 3032 case R_68K_PLT16O: 3033 case R_68K_PLT32O: 3034 case R_68K_PC8: 3035 case R_68K_PC16: 3036 case R_68K_PC32: 3037 case R_68K_8: 3038 case R_68K_16: 3039 case R_68K_32: 3040 if (h != NULL) 3041 { 3042 if (h->plt.refcount > 0) 3043 --h->plt.refcount; 3044 } 3045 break; 3046 3047 default: 3048 break; 3049 } 3050 } 3051 3052 return TRUE; 3053 } 3054 3055 /* Return the type of PLT associated with OUTPUT_BFD. */ 3057 3058 static const struct elf_m68k_plt_info * 3059 elf_m68k_get_plt_info (bfd *output_bfd) 3060 { 3061 unsigned int features; 3062 3063 features = bfd_m68k_mach_to_features (bfd_get_mach (output_bfd)); 3064 if (features & cpu32) 3065 return &elf_cpu32_plt_info; 3066 if (features & mcfisa_b) 3067 return &elf_isab_plt_info; 3068 if (features & mcfisa_c) 3069 return &elf_isac_plt_info; 3070 return &elf_m68k_plt_info; 3071 } 3072 3073 /* This function is called after all the input files have been read, 3074 and the input sections have been assigned to output sections. 3075 It's a convenient place to determine the PLT style. */ 3076 3077 static bfd_boolean 3078 elf_m68k_always_size_sections (bfd *output_bfd, struct bfd_link_info *info) 3079 { 3080 /* Bind input BFDs to GOTs and calculate sizes of .got and .rela.got 3081 sections. */ 3082 if (!elf_m68k_partition_multi_got (info)) 3083 return FALSE; 3084 3085 elf_m68k_hash_table (info)->plt_info = elf_m68k_get_plt_info (output_bfd); 3086 return TRUE; 3087 } 3088 3089 /* Adjust a symbol defined by a dynamic object and referenced by a 3090 regular object. The current definition is in some section of the 3091 dynamic object, but we're not including those sections. We have to 3092 change the definition to something the rest of the link can 3093 understand. */ 3094 3095 static bfd_boolean 3096 elf_m68k_adjust_dynamic_symbol (struct bfd_link_info *info, 3097 struct elf_link_hash_entry *h) 3098 { 3099 struct elf_m68k_link_hash_table *htab; 3100 bfd *dynobj; 3101 asection *s; 3102 3103 htab = elf_m68k_hash_table (info); 3104 dynobj = elf_hash_table (info)->dynobj; 3105 3106 /* Make sure we know what is going on here. */ 3107 BFD_ASSERT (dynobj != NULL 3108 && (h->needs_plt 3109 || h->u.weakdef != NULL 3110 || (h->def_dynamic 3111 && h->ref_regular 3112 && !h->def_regular))); 3113 3114 /* If this is a function, put it in the procedure linkage table. We 3115 will fill in the contents of the procedure linkage table later, 3116 when we know the address of the .got section. */ 3117 if (h->type == STT_FUNC 3118 || h->needs_plt) 3119 { 3120 if ((h->plt.refcount <= 0 3121 || SYMBOL_CALLS_LOCAL (info, h) 3122 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 3123 && h->root.type == bfd_link_hash_undefweak)) 3124 /* We must always create the plt entry if it was referenced 3125 by a PLTxxO relocation. In this case we already recorded 3126 it as a dynamic symbol. */ 3127 && h->dynindx == -1) 3128 { 3129 /* This case can occur if we saw a PLTxx reloc in an input 3130 file, but the symbol was never referred to by a dynamic 3131 object, or if all references were garbage collected. In 3132 such a case, we don't actually need to build a procedure 3133 linkage table, and we can just do a PCxx reloc instead. */ 3134 h->plt.offset = (bfd_vma) -1; 3135 h->needs_plt = 0; 3136 return TRUE; 3137 } 3138 3139 /* Make sure this symbol is output as a dynamic symbol. */ 3140 if (h->dynindx == -1 3141 && !h->forced_local) 3142 { 3143 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 3144 return FALSE; 3145 } 3146 3147 s = bfd_get_linker_section (dynobj, ".plt"); 3148 BFD_ASSERT (s != NULL); 3149 3150 /* If this is the first .plt entry, make room for the special 3151 first entry. */ 3152 if (s->size == 0) 3153 s->size = htab->plt_info->size; 3154 3155 /* If this symbol is not defined in a regular file, and we are 3156 not generating a shared library, then set the symbol to this 3157 location in the .plt. This is required to make function 3158 pointers compare as equal between the normal executable and 3159 the shared library. */ 3160 if (!info->shared 3161 && !h->def_regular) 3162 { 3163 h->root.u.def.section = s; 3164 h->root.u.def.value = s->size; 3165 } 3166 3167 h->plt.offset = s->size; 3168 3169 /* Make room for this entry. */ 3170 s->size += htab->plt_info->size; 3171 3172 /* We also need to make an entry in the .got.plt section, which 3173 will be placed in the .got section by the linker script. */ 3174 s = bfd_get_linker_section (dynobj, ".got.plt"); 3175 BFD_ASSERT (s != NULL); 3176 s->size += 4; 3177 3178 /* We also need to make an entry in the .rela.plt section. */ 3179 s = bfd_get_linker_section (dynobj, ".rela.plt"); 3180 BFD_ASSERT (s != NULL); 3181 s->size += sizeof (Elf32_External_Rela); 3182 3183 return TRUE; 3184 } 3185 3186 /* Reinitialize the plt offset now that it is not used as a reference 3187 count any more. */ 3188 h->plt.offset = (bfd_vma) -1; 3189 3190 /* If this is a weak symbol, and there is a real definition, the 3191 processor independent code will have arranged for us to see the 3192 real definition first, and we can just use the same value. */ 3193 if (h->u.weakdef != NULL) 3194 { 3195 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 3196 || h->u.weakdef->root.type == bfd_link_hash_defweak); 3197 h->root.u.def.section = h->u.weakdef->root.u.def.section; 3198 h->root.u.def.value = h->u.weakdef->root.u.def.value; 3199 return TRUE; 3200 } 3201 3202 /* This is a reference to a symbol defined by a dynamic object which 3203 is not a function. */ 3204 3205 /* If we are creating a shared library, we must presume that the 3206 only references to the symbol are via the global offset table. 3207 For such cases we need not do anything here; the relocations will 3208 be handled correctly by relocate_section. */ 3209 if (info->shared) 3210 return TRUE; 3211 3212 /* If there are no references to this symbol that do not use the 3213 GOT, we don't need to generate a copy reloc. */ 3214 if (!h->non_got_ref) 3215 return TRUE; 3216 3217 /* We must allocate the symbol in our .dynbss section, which will 3218 become part of the .bss section of the executable. There will be 3219 an entry for this symbol in the .dynsym section. The dynamic 3220 object will contain position independent code, so all references 3221 from the dynamic object to this symbol will go through the global 3222 offset table. The dynamic linker will use the .dynsym entry to 3223 determine the address it must put in the global offset table, so 3224 both the dynamic object and the regular object will refer to the 3225 same memory location for the variable. */ 3226 3227 s = bfd_get_linker_section (dynobj, ".dynbss"); 3228 BFD_ASSERT (s != NULL); 3229 3230 /* We must generate a R_68K_COPY reloc to tell the dynamic linker to 3231 copy the initial value out of the dynamic object and into the 3232 runtime process image. We need to remember the offset into the 3233 .rela.bss section we are going to use. */ 3234 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) 3235 { 3236 asection *srel; 3237 3238 srel = bfd_get_linker_section (dynobj, ".rela.bss"); 3239 BFD_ASSERT (srel != NULL); 3240 srel->size += sizeof (Elf32_External_Rela); 3241 h->needs_copy = 1; 3242 } 3243 3244 return _bfd_elf_adjust_dynamic_copy (h, s); 3245 } 3246 3247 /* Set the sizes of the dynamic sections. */ 3248 3249 static bfd_boolean 3250 elf_m68k_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, 3251 struct bfd_link_info *info) 3252 { 3253 bfd *dynobj; 3254 asection *s; 3255 bfd_boolean plt; 3256 bfd_boolean relocs; 3257 3258 dynobj = elf_hash_table (info)->dynobj; 3259 BFD_ASSERT (dynobj != NULL); 3260 3261 if (elf_hash_table (info)->dynamic_sections_created) 3262 { 3263 /* Set the contents of the .interp section to the interpreter. */ 3264 if (info->executable) 3265 { 3266 s = bfd_get_linker_section (dynobj, ".interp"); 3267 BFD_ASSERT (s != NULL); 3268 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 3269 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 3270 } 3271 } 3272 else 3273 { 3274 /* We may have created entries in the .rela.got section. 3275 However, if we are not creating the dynamic sections, we will 3276 not actually use these entries. Reset the size of .rela.got, 3277 which will cause it to get stripped from the output file 3278 below. */ 3279 s = bfd_get_linker_section (dynobj, ".rela.got"); 3280 if (s != NULL) 3281 s->size = 0; 3282 } 3283 3284 /* If this is a -Bsymbolic shared link, then we need to discard all 3285 PC relative relocs against symbols defined in a regular object. 3286 For the normal shared case we discard the PC relative relocs 3287 against symbols that have become local due to visibility changes. 3288 We allocated space for them in the check_relocs routine, but we 3289 will not fill them in in the relocate_section routine. */ 3290 if (info->shared) 3291 elf_link_hash_traverse (elf_hash_table (info), 3292 elf_m68k_discard_copies, 3293 info); 3294 3295 /* The check_relocs and adjust_dynamic_symbol entry points have 3296 determined the sizes of the various dynamic sections. Allocate 3297 memory for them. */ 3298 plt = FALSE; 3299 relocs = FALSE; 3300 for (s = dynobj->sections; s != NULL; s = s->next) 3301 { 3302 const char *name; 3303 3304 if ((s->flags & SEC_LINKER_CREATED) == 0) 3305 continue; 3306 3307 /* It's OK to base decisions on the section name, because none 3308 of the dynobj section names depend upon the input files. */ 3309 name = bfd_get_section_name (dynobj, s); 3310 3311 if (strcmp (name, ".plt") == 0) 3312 { 3313 /* Remember whether there is a PLT. */ 3314 plt = s->size != 0; 3315 } 3316 else if (CONST_STRNEQ (name, ".rela")) 3317 { 3318 if (s->size != 0) 3319 { 3320 relocs = TRUE; 3321 3322 /* We use the reloc_count field as a counter if we need 3323 to copy relocs into the output file. */ 3324 s->reloc_count = 0; 3325 } 3326 } 3327 else if (! CONST_STRNEQ (name, ".got") 3328 && strcmp (name, ".dynbss") != 0) 3329 { 3330 /* It's not one of our sections, so don't allocate space. */ 3331 continue; 3332 } 3333 3334 if (s->size == 0) 3335 { 3336 /* If we don't need this section, strip it from the 3337 output file. This is mostly to handle .rela.bss and 3338 .rela.plt. We must create both sections in 3339 create_dynamic_sections, because they must be created 3340 before the linker maps input sections to output 3341 sections. The linker does that before 3342 adjust_dynamic_symbol is called, and it is that 3343 function which decides whether anything needs to go 3344 into these sections. */ 3345 s->flags |= SEC_EXCLUDE; 3346 continue; 3347 } 3348 3349 if ((s->flags & SEC_HAS_CONTENTS) == 0) 3350 continue; 3351 3352 /* Allocate memory for the section contents. */ 3353 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc. 3354 Unused entries should be reclaimed before the section's contents 3355 are written out, but at the moment this does not happen. Thus in 3356 order to prevent writing out garbage, we initialise the section's 3357 contents to zero. */ 3358 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); 3359 if (s->contents == NULL) 3360 return FALSE; 3361 } 3362 3363 if (elf_hash_table (info)->dynamic_sections_created) 3364 { 3365 /* Add some entries to the .dynamic section. We fill in the 3366 values later, in elf_m68k_finish_dynamic_sections, but we 3367 must add the entries now so that we get the correct size for 3368 the .dynamic section. The DT_DEBUG entry is filled in by the 3369 dynamic linker and used by the debugger. */ 3370 #define add_dynamic_entry(TAG, VAL) \ 3371 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 3372 3373 if (!info->shared) 3374 { 3375 if (!add_dynamic_entry (DT_DEBUG, 0)) 3376 return FALSE; 3377 } 3378 3379 if (plt) 3380 { 3381 if (!add_dynamic_entry (DT_PLTGOT, 0) 3382 || !add_dynamic_entry (DT_PLTRELSZ, 0) 3383 || !add_dynamic_entry (DT_PLTREL, DT_RELA) 3384 || !add_dynamic_entry (DT_JMPREL, 0)) 3385 return FALSE; 3386 } 3387 3388 if (relocs) 3389 { 3390 if (!add_dynamic_entry (DT_RELA, 0) 3391 || !add_dynamic_entry (DT_RELASZ, 0) 3392 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela))) 3393 return FALSE; 3394 } 3395 3396 if ((info->flags & DF_TEXTREL) != 0) 3397 { 3398 if (!add_dynamic_entry (DT_TEXTREL, 0)) 3399 return FALSE; 3400 } 3401 } 3402 #undef add_dynamic_entry 3403 3404 return TRUE; 3405 } 3406 3407 /* This function is called via elf_link_hash_traverse if we are 3408 creating a shared object. In the -Bsymbolic case it discards the 3409 space allocated to copy PC relative relocs against symbols which 3410 are defined in regular objects. For the normal shared case, it 3411 discards space for pc-relative relocs that have become local due to 3412 symbol visibility changes. We allocated space for them in the 3413 check_relocs routine, but we won't fill them in in the 3414 relocate_section routine. 3415 3416 We also check whether any of the remaining relocations apply 3417 against a readonly section, and set the DF_TEXTREL flag in this 3418 case. */ 3419 3420 static bfd_boolean 3421 elf_m68k_discard_copies (struct elf_link_hash_entry *h, 3422 void * inf) 3423 { 3424 struct bfd_link_info *info = (struct bfd_link_info *) inf; 3425 struct elf_m68k_pcrel_relocs_copied *s; 3426 3427 if (!SYMBOL_CALLS_LOCAL (info, h)) 3428 { 3429 if ((info->flags & DF_TEXTREL) == 0) 3430 { 3431 /* Look for relocations against read-only sections. */ 3432 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied; 3433 s != NULL; 3434 s = s->next) 3435 if ((s->section->flags & SEC_READONLY) != 0) 3436 { 3437 info->flags |= DF_TEXTREL; 3438 break; 3439 } 3440 } 3441 3442 /* Make sure undefined weak symbols are output as a dynamic symbol 3443 in PIEs. */ 3444 if (h->non_got_ref 3445 && h->root.type == bfd_link_hash_undefweak 3446 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 3447 && h->dynindx == -1 3448 && !h->forced_local) 3449 { 3450 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 3451 return FALSE; 3452 } 3453 3454 return TRUE; 3455 } 3456 3457 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied; 3458 s != NULL; 3459 s = s->next) 3460 s->section->size -= s->count * sizeof (Elf32_External_Rela); 3461 3462 return TRUE; 3463 } 3464 3465 3466 /* Install relocation RELA. */ 3467 3468 static void 3469 elf_m68k_install_rela (bfd *output_bfd, 3470 asection *srela, 3471 Elf_Internal_Rela *rela) 3472 { 3473 bfd_byte *loc; 3474 3475 loc = srela->contents; 3476 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela); 3477 bfd_elf32_swap_reloca_out (output_bfd, rela, loc); 3478 } 3479 3480 /* Find the base offsets for thread-local storage in this object, 3481 for GD/LD and IE/LE respectively. */ 3482 3483 #define DTP_OFFSET 0x8000 3484 #define TP_OFFSET 0x7000 3485 3486 static bfd_vma 3487 dtpoff_base (struct bfd_link_info *info) 3488 { 3489 /* If tls_sec is NULL, we should have signalled an error already. */ 3490 if (elf_hash_table (info)->tls_sec == NULL) 3491 return 0; 3492 return elf_hash_table (info)->tls_sec->vma + DTP_OFFSET; 3493 } 3494 3495 static bfd_vma 3496 tpoff_base (struct bfd_link_info *info) 3497 { 3498 /* If tls_sec is NULL, we should have signalled an error already. */ 3499 if (elf_hash_table (info)->tls_sec == NULL) 3500 return 0; 3501 return elf_hash_table (info)->tls_sec->vma + TP_OFFSET; 3502 } 3503 3504 /* Output necessary relocation to handle a symbol during static link. 3505 This function is called from elf_m68k_relocate_section. */ 3506 3507 static void 3508 elf_m68k_init_got_entry_static (struct bfd_link_info *info, 3509 bfd *output_bfd, 3510 enum elf_m68k_reloc_type r_type, 3511 asection *sgot, 3512 bfd_vma got_entry_offset, 3513 bfd_vma relocation) 3514 { 3515 switch (elf_m68k_reloc_got_type (r_type)) 3516 { 3517 case R_68K_GOT32O: 3518 bfd_put_32 (output_bfd, relocation, sgot->contents + got_entry_offset); 3519 break; 3520 3521 case R_68K_TLS_GD32: 3522 /* We know the offset within the module, 3523 put it into the second GOT slot. */ 3524 bfd_put_32 (output_bfd, relocation - dtpoff_base (info), 3525 sgot->contents + got_entry_offset + 4); 3526 /* FALLTHRU */ 3527 3528 case R_68K_TLS_LDM32: 3529 /* Mark it as belonging to module 1, the executable. */ 3530 bfd_put_32 (output_bfd, 1, sgot->contents + got_entry_offset); 3531 break; 3532 3533 case R_68K_TLS_IE32: 3534 bfd_put_32 (output_bfd, relocation - tpoff_base (info), 3535 sgot->contents + got_entry_offset); 3536 break; 3537 3538 default: 3539 BFD_ASSERT (FALSE); 3540 } 3541 } 3542 3543 /* Output necessary relocation to handle a local symbol 3544 during dynamic link. 3545 This function is called either from elf_m68k_relocate_section 3546 or from elf_m68k_finish_dynamic_symbol. */ 3547 3548 static void 3549 elf_m68k_init_got_entry_local_shared (struct bfd_link_info *info, 3550 bfd *output_bfd, 3551 enum elf_m68k_reloc_type r_type, 3552 asection *sgot, 3553 bfd_vma got_entry_offset, 3554 bfd_vma relocation, 3555 asection *srela) 3556 { 3557 Elf_Internal_Rela outrel; 3558 3559 switch (elf_m68k_reloc_got_type (r_type)) 3560 { 3561 case R_68K_GOT32O: 3562 /* Emit RELATIVE relocation to initialize GOT slot 3563 at run-time. */ 3564 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE); 3565 outrel.r_addend = relocation; 3566 break; 3567 3568 case R_68K_TLS_GD32: 3569 /* We know the offset within the module, 3570 put it into the second GOT slot. */ 3571 bfd_put_32 (output_bfd, relocation - dtpoff_base (info), 3572 sgot->contents + got_entry_offset + 4); 3573 /* FALLTHRU */ 3574 3575 case R_68K_TLS_LDM32: 3576 /* We don't know the module number, 3577 create a relocation for it. */ 3578 outrel.r_info = ELF32_R_INFO (0, R_68K_TLS_DTPMOD32); 3579 outrel.r_addend = 0; 3580 break; 3581 3582 case R_68K_TLS_IE32: 3583 /* Emit TPREL relocation to initialize GOT slot 3584 at run-time. */ 3585 outrel.r_info = ELF32_R_INFO (0, R_68K_TLS_TPREL32); 3586 outrel.r_addend = relocation - elf_hash_table (info)->tls_sec->vma; 3587 break; 3588 3589 default: 3590 BFD_ASSERT (FALSE); 3591 } 3592 3593 /* Offset of the GOT entry. */ 3594 outrel.r_offset = (sgot->output_section->vma 3595 + sgot->output_offset 3596 + got_entry_offset); 3597 3598 /* Install one of the above relocations. */ 3599 elf_m68k_install_rela (output_bfd, srela, &outrel); 3600 3601 bfd_put_32 (output_bfd, outrel.r_addend, sgot->contents + got_entry_offset); 3602 } 3603 3604 /* Relocate an M68K ELF section. */ 3605 3606 static bfd_boolean 3607 elf_m68k_relocate_section (bfd *output_bfd, 3608 struct bfd_link_info *info, 3609 bfd *input_bfd, 3610 asection *input_section, 3611 bfd_byte *contents, 3612 Elf_Internal_Rela *relocs, 3613 Elf_Internal_Sym *local_syms, 3614 asection **local_sections) 3615 { 3616 bfd *dynobj; 3617 Elf_Internal_Shdr *symtab_hdr; 3618 struct elf_link_hash_entry **sym_hashes; 3619 asection *sgot; 3620 asection *splt; 3621 asection *sreloc; 3622 asection *srela; 3623 struct elf_m68k_got *got; 3624 Elf_Internal_Rela *rel; 3625 Elf_Internal_Rela *relend; 3626 3627 dynobj = elf_hash_table (info)->dynobj; 3628 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 3629 sym_hashes = elf_sym_hashes (input_bfd); 3630 3631 sgot = NULL; 3632 splt = NULL; 3633 sreloc = NULL; 3634 srela = NULL; 3635 3636 got = NULL; 3637 3638 rel = relocs; 3639 relend = relocs + input_section->reloc_count; 3640 for (; rel < relend; rel++) 3641 { 3642 int r_type; 3643 reloc_howto_type *howto; 3644 unsigned long r_symndx; 3645 struct elf_link_hash_entry *h; 3646 Elf_Internal_Sym *sym; 3647 asection *sec; 3648 bfd_vma relocation; 3649 bfd_boolean unresolved_reloc; 3650 bfd_reloc_status_type r; 3651 3652 r_type = ELF32_R_TYPE (rel->r_info); 3653 if (r_type < 0 || r_type >= (int) R_68K_max) 3654 { 3655 bfd_set_error (bfd_error_bad_value); 3656 return FALSE; 3657 } 3658 howto = howto_table + r_type; 3659 3660 r_symndx = ELF32_R_SYM (rel->r_info); 3661 3662 h = NULL; 3663 sym = NULL; 3664 sec = NULL; 3665 unresolved_reloc = FALSE; 3666 3667 if (r_symndx < symtab_hdr->sh_info) 3668 { 3669 sym = local_syms + r_symndx; 3670 sec = local_sections[r_symndx]; 3671 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 3672 } 3673 else 3674 { 3675 bfd_boolean warned; 3676 3677 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 3678 r_symndx, symtab_hdr, sym_hashes, 3679 h, sec, relocation, 3680 unresolved_reloc, warned); 3681 } 3682 3683 if (sec != NULL && discarded_section (sec)) 3684 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 3685 rel, 1, relend, howto, 0, contents); 3686 3687 if (info->relocatable) 3688 continue; 3689 3690 switch (r_type) 3691 { 3692 case R_68K_GOT8: 3693 case R_68K_GOT16: 3694 case R_68K_GOT32: 3695 /* Relocation is to the address of the entry for this symbol 3696 in the global offset table. */ 3697 if (h != NULL 3698 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) 3699 { 3700 if (elf_m68k_hash_table (info)->local_gp_p) 3701 { 3702 bfd_vma sgot_output_offset; 3703 bfd_vma got_offset; 3704 3705 if (sgot == NULL) 3706 { 3707 sgot = bfd_get_linker_section (dynobj, ".got"); 3708 3709 if (sgot != NULL) 3710 sgot_output_offset = sgot->output_offset; 3711 else 3712 /* In this case we have a reference to 3713 _GLOBAL_OFFSET_TABLE_, but the GOT itself is 3714 empty. 3715 ??? Issue a warning? */ 3716 sgot_output_offset = 0; 3717 } 3718 else 3719 sgot_output_offset = sgot->output_offset; 3720 3721 if (got == NULL) 3722 { 3723 struct elf_m68k_bfd2got_entry *bfd2got_entry; 3724 3725 bfd2got_entry 3726 = elf_m68k_get_bfd2got_entry (elf_m68k_multi_got (info), 3727 input_bfd, SEARCH, NULL); 3728 3729 if (bfd2got_entry != NULL) 3730 { 3731 got = bfd2got_entry->got; 3732 BFD_ASSERT (got != NULL); 3733 3734 got_offset = got->offset; 3735 } 3736 else 3737 /* In this case we have a reference to 3738 _GLOBAL_OFFSET_TABLE_, but no other references 3739 accessing any GOT entries. 3740 ??? Issue a warning? */ 3741 got_offset = 0; 3742 } 3743 else 3744 got_offset = got->offset; 3745 3746 /* Adjust GOT pointer to point to the GOT 3747 assigned to input_bfd. */ 3748 rel->r_addend += sgot_output_offset + got_offset; 3749 } 3750 else 3751 BFD_ASSERT (got == NULL || got->offset == 0); 3752 3753 break; 3754 } 3755 /* Fall through. */ 3756 case R_68K_GOT8O: 3757 case R_68K_GOT16O: 3758 case R_68K_GOT32O: 3759 3760 case R_68K_TLS_LDM32: 3761 case R_68K_TLS_LDM16: 3762 case R_68K_TLS_LDM8: 3763 3764 case R_68K_TLS_GD8: 3765 case R_68K_TLS_GD16: 3766 case R_68K_TLS_GD32: 3767 3768 case R_68K_TLS_IE8: 3769 case R_68K_TLS_IE16: 3770 case R_68K_TLS_IE32: 3771 3772 /* Relocation is the offset of the entry for this symbol in 3773 the global offset table. */ 3774 3775 { 3776 struct elf_m68k_got_entry_key key_; 3777 bfd_vma *off_ptr; 3778 bfd_vma off; 3779 3780 if (sgot == NULL) 3781 { 3782 sgot = bfd_get_linker_section (dynobj, ".got"); 3783 BFD_ASSERT (sgot != NULL); 3784 } 3785 3786 if (got == NULL) 3787 { 3788 got = elf_m68k_get_bfd2got_entry (elf_m68k_multi_got (info), 3789 input_bfd, MUST_FIND, 3790 NULL)->got; 3791 BFD_ASSERT (got != NULL); 3792 } 3793 3794 /* Get GOT offset for this symbol. */ 3795 elf_m68k_init_got_entry_key (&key_, h, input_bfd, r_symndx, 3796 r_type); 3797 off_ptr = &elf_m68k_get_got_entry (got, &key_, MUST_FIND, 3798 NULL)->u.s2.offset; 3799 off = *off_ptr; 3800 3801 /* The offset must always be a multiple of 4. We use 3802 the least significant bit to record whether we have 3803 already generated the necessary reloc. */ 3804 if ((off & 1) != 0) 3805 off &= ~1; 3806 else 3807 { 3808 if (h != NULL 3809 /* @TLSLDM relocations are bounded to the module, in 3810 which the symbol is defined -- not to the symbol 3811 itself. */ 3812 && elf_m68k_reloc_got_type (r_type) != R_68K_TLS_LDM32) 3813 { 3814 bfd_boolean dyn; 3815 3816 dyn = elf_hash_table (info)->dynamic_sections_created; 3817 if (!WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) 3818 || (info->shared 3819 && SYMBOL_REFERENCES_LOCAL (info, h)) 3820 || (ELF_ST_VISIBILITY (h->other) 3821 && h->root.type == bfd_link_hash_undefweak)) 3822 { 3823 /* This is actually a static link, or it is a 3824 -Bsymbolic link and the symbol is defined 3825 locally, or the symbol was forced to be local 3826 because of a version file. We must initialize 3827 this entry in the global offset table. Since 3828 the offset must always be a multiple of 4, we 3829 use the least significant bit to record whether 3830 we have initialized it already. 3831 3832 When doing a dynamic link, we create a .rela.got 3833 relocation entry to initialize the value. This 3834 is done in the finish_dynamic_symbol routine. */ 3835 3836 elf_m68k_init_got_entry_static (info, 3837 output_bfd, 3838 r_type, 3839 sgot, 3840 off, 3841 relocation); 3842 3843 *off_ptr |= 1; 3844 } 3845 else 3846 unresolved_reloc = FALSE; 3847 } 3848 else if (info->shared) /* && h == NULL */ 3849 /* Process local symbol during dynamic link. */ 3850 { 3851 if (srela == NULL) 3852 { 3853 srela = bfd_get_linker_section (dynobj, ".rela.got"); 3854 BFD_ASSERT (srela != NULL); 3855 } 3856 3857 elf_m68k_init_got_entry_local_shared (info, 3858 output_bfd, 3859 r_type, 3860 sgot, 3861 off, 3862 relocation, 3863 srela); 3864 3865 *off_ptr |= 1; 3866 } 3867 else /* h == NULL && !info->shared */ 3868 { 3869 elf_m68k_init_got_entry_static (info, 3870 output_bfd, 3871 r_type, 3872 sgot, 3873 off, 3874 relocation); 3875 3876 *off_ptr |= 1; 3877 } 3878 } 3879 3880 /* We don't use elf_m68k_reloc_got_type in the condition below 3881 because this is the only place where difference between 3882 R_68K_GOTx and R_68K_GOTxO relocations matters. */ 3883 if (r_type == R_68K_GOT32O 3884 || r_type == R_68K_GOT16O 3885 || r_type == R_68K_GOT8O 3886 || elf_m68k_reloc_got_type (r_type) == R_68K_TLS_GD32 3887 || elf_m68k_reloc_got_type (r_type) == R_68K_TLS_LDM32 3888 || elf_m68k_reloc_got_type (r_type) == R_68K_TLS_IE32) 3889 { 3890 /* GOT pointer is adjusted to point to the start/middle 3891 of local GOT. Adjust the offset accordingly. */ 3892 BFD_ASSERT (elf_m68k_hash_table (info)->use_neg_got_offsets_p 3893 || off >= got->offset); 3894 3895 if (elf_m68k_hash_table (info)->local_gp_p) 3896 relocation = off - got->offset; 3897 else 3898 { 3899 BFD_ASSERT (got->offset == 0); 3900 relocation = sgot->output_offset + off; 3901 } 3902 3903 /* This relocation does not use the addend. */ 3904 rel->r_addend = 0; 3905 } 3906 else 3907 relocation = (sgot->output_section->vma + sgot->output_offset 3908 + off); 3909 } 3910 break; 3911 3912 case R_68K_TLS_LDO32: 3913 case R_68K_TLS_LDO16: 3914 case R_68K_TLS_LDO8: 3915 relocation -= dtpoff_base (info); 3916 break; 3917 3918 case R_68K_TLS_LE32: 3919 case R_68K_TLS_LE16: 3920 case R_68K_TLS_LE8: 3921 if (info->shared && !info->pie) 3922 { 3923 (*_bfd_error_handler) 3924 (_("%B(%A+0x%lx): R_68K_TLS_LE32 relocation not permitted " 3925 "in shared object"), 3926 input_bfd, input_section, (long) rel->r_offset, howto->name); 3927 3928 return FALSE; 3929 } 3930 else 3931 relocation -= tpoff_base (info); 3932 3933 break; 3934 3935 case R_68K_PLT8: 3936 case R_68K_PLT16: 3937 case R_68K_PLT32: 3938 /* Relocation is to the entry for this symbol in the 3939 procedure linkage table. */ 3940 3941 /* Resolve a PLTxx reloc against a local symbol directly, 3942 without using the procedure linkage table. */ 3943 if (h == NULL) 3944 break; 3945 3946 if (h->plt.offset == (bfd_vma) -1 3947 || !elf_hash_table (info)->dynamic_sections_created) 3948 { 3949 /* We didn't make a PLT entry for this symbol. This 3950 happens when statically linking PIC code, or when 3951 using -Bsymbolic. */ 3952 break; 3953 } 3954 3955 if (splt == NULL) 3956 { 3957 splt = bfd_get_linker_section (dynobj, ".plt"); 3958 BFD_ASSERT (splt != NULL); 3959 } 3960 3961 relocation = (splt->output_section->vma 3962 + splt->output_offset 3963 + h->plt.offset); 3964 unresolved_reloc = FALSE; 3965 break; 3966 3967 case R_68K_PLT8O: 3968 case R_68K_PLT16O: 3969 case R_68K_PLT32O: 3970 /* Relocation is the offset of the entry for this symbol in 3971 the procedure linkage table. */ 3972 BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1); 3973 3974 if (splt == NULL) 3975 { 3976 splt = bfd_get_linker_section (dynobj, ".plt"); 3977 BFD_ASSERT (splt != NULL); 3978 } 3979 3980 relocation = h->plt.offset; 3981 unresolved_reloc = FALSE; 3982 3983 /* This relocation does not use the addend. */ 3984 rel->r_addend = 0; 3985 3986 break; 3987 3988 case R_68K_8: 3989 case R_68K_16: 3990 case R_68K_32: 3991 case R_68K_PC8: 3992 case R_68K_PC16: 3993 case R_68K_PC32: 3994 if (info->shared 3995 && r_symndx != STN_UNDEF 3996 && (input_section->flags & SEC_ALLOC) != 0 3997 && (h == NULL 3998 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 3999 || h->root.type != bfd_link_hash_undefweak) 4000 && ((r_type != R_68K_PC8 4001 && r_type != R_68K_PC16 4002 && r_type != R_68K_PC32) 4003 || !SYMBOL_CALLS_LOCAL (info, h))) 4004 { 4005 Elf_Internal_Rela outrel; 4006 bfd_byte *loc; 4007 bfd_boolean skip, relocate; 4008 4009 /* When generating a shared object, these relocations 4010 are copied into the output file to be resolved at run 4011 time. */ 4012 4013 skip = FALSE; 4014 relocate = FALSE; 4015 4016 outrel.r_offset = 4017 _bfd_elf_section_offset (output_bfd, info, input_section, 4018 rel->r_offset); 4019 if (outrel.r_offset == (bfd_vma) -1) 4020 skip = TRUE; 4021 else if (outrel.r_offset == (bfd_vma) -2) 4022 skip = TRUE, relocate = TRUE; 4023 outrel.r_offset += (input_section->output_section->vma 4024 + input_section->output_offset); 4025 4026 if (skip) 4027 memset (&outrel, 0, sizeof outrel); 4028 else if (h != NULL 4029 && h->dynindx != -1 4030 && (r_type == R_68K_PC8 4031 || r_type == R_68K_PC16 4032 || r_type == R_68K_PC32 4033 || !info->shared 4034 || !info->symbolic 4035 || !h->def_regular)) 4036 { 4037 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 4038 outrel.r_addend = rel->r_addend; 4039 } 4040 else 4041 { 4042 /* This symbol is local, or marked to become local. */ 4043 outrel.r_addend = relocation + rel->r_addend; 4044 4045 if (r_type == R_68K_32) 4046 { 4047 relocate = TRUE; 4048 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE); 4049 } 4050 else 4051 { 4052 long indx; 4053 4054 if (bfd_is_abs_section (sec)) 4055 indx = 0; 4056 else if (sec == NULL || sec->owner == NULL) 4057 { 4058 bfd_set_error (bfd_error_bad_value); 4059 return FALSE; 4060 } 4061 else 4062 { 4063 asection *osec; 4064 4065 /* We are turning this relocation into one 4066 against a section symbol. It would be 4067 proper to subtract the symbol's value, 4068 osec->vma, from the emitted reloc addend, 4069 but ld.so expects buggy relocs. */ 4070 osec = sec->output_section; 4071 indx = elf_section_data (osec)->dynindx; 4072 if (indx == 0) 4073 { 4074 struct elf_link_hash_table *htab; 4075 htab = elf_hash_table (info); 4076 osec = htab->text_index_section; 4077 indx = elf_section_data (osec)->dynindx; 4078 } 4079 BFD_ASSERT (indx != 0); 4080 } 4081 4082 outrel.r_info = ELF32_R_INFO (indx, r_type); 4083 } 4084 } 4085 4086 sreloc = elf_section_data (input_section)->sreloc; 4087 if (sreloc == NULL) 4088 abort (); 4089 4090 loc = sreloc->contents; 4091 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); 4092 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 4093 4094 /* This reloc will be computed at runtime, so there's no 4095 need to do anything now, except for R_68K_32 4096 relocations that have been turned into 4097 R_68K_RELATIVE. */ 4098 if (!relocate) 4099 continue; 4100 } 4101 4102 break; 4103 4104 case R_68K_GNU_VTINHERIT: 4105 case R_68K_GNU_VTENTRY: 4106 /* These are no-ops in the end. */ 4107 continue; 4108 4109 default: 4110 break; 4111 } 4112 4113 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 4114 because such sections are not SEC_ALLOC and thus ld.so will 4115 not process them. */ 4116 if (unresolved_reloc 4117 && !((input_section->flags & SEC_DEBUGGING) != 0 4118 && h->def_dynamic) 4119 && _bfd_elf_section_offset (output_bfd, info, input_section, 4120 rel->r_offset) != (bfd_vma) -1) 4121 { 4122 (*_bfd_error_handler) 4123 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), 4124 input_bfd, 4125 input_section, 4126 (long) rel->r_offset, 4127 howto->name, 4128 h->root.root.string); 4129 return FALSE; 4130 } 4131 4132 if (r_symndx != STN_UNDEF 4133 && r_type != R_68K_NONE 4134 && (h == NULL 4135 || h->root.type == bfd_link_hash_defined 4136 || h->root.type == bfd_link_hash_defweak)) 4137 { 4138 char sym_type; 4139 4140 sym_type = (sym != NULL) ? ELF32_ST_TYPE (sym->st_info) : h->type; 4141 4142 if (elf_m68k_reloc_tls_p (r_type) != (sym_type == STT_TLS)) 4143 { 4144 const char *name; 4145 4146 if (h != NULL) 4147 name = h->root.root.string; 4148 else 4149 { 4150 name = (bfd_elf_string_from_elf_section 4151 (input_bfd, symtab_hdr->sh_link, sym->st_name)); 4152 if (name == NULL || *name == '\0') 4153 name = bfd_section_name (input_bfd, sec); 4154 } 4155 4156 (*_bfd_error_handler) 4157 ((sym_type == STT_TLS 4158 ? _("%B(%A+0x%lx): %s used with TLS symbol %s") 4159 : _("%B(%A+0x%lx): %s used with non-TLS symbol %s")), 4160 input_bfd, 4161 input_section, 4162 (long) rel->r_offset, 4163 howto->name, 4164 name); 4165 } 4166 } 4167 4168 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 4169 contents, rel->r_offset, 4170 relocation, rel->r_addend); 4171 4172 if (r != bfd_reloc_ok) 4173 { 4174 const char *name; 4175 4176 if (h != NULL) 4177 name = h->root.root.string; 4178 else 4179 { 4180 name = bfd_elf_string_from_elf_section (input_bfd, 4181 symtab_hdr->sh_link, 4182 sym->st_name); 4183 if (name == NULL) 4184 return FALSE; 4185 if (*name == '\0') 4186 name = bfd_section_name (input_bfd, sec); 4187 } 4188 4189 if (r == bfd_reloc_overflow) 4190 { 4191 if (!(info->callbacks->reloc_overflow 4192 (info, (h ? &h->root : NULL), name, howto->name, 4193 (bfd_vma) 0, input_bfd, input_section, 4194 rel->r_offset))) 4195 return FALSE; 4196 } 4197 else 4198 { 4199 (*_bfd_error_handler) 4200 (_("%B(%A+0x%lx): reloc against `%s': error %d"), 4201 input_bfd, input_section, 4202 (long) rel->r_offset, name, (int) r); 4203 return FALSE; 4204 } 4205 } 4206 } 4207 4208 return TRUE; 4209 } 4210 4211 /* Install an M_68K_PC32 relocation against VALUE at offset OFFSET 4212 into section SEC. */ 4213 4214 static void 4215 elf_m68k_install_pc32 (asection *sec, bfd_vma offset, bfd_vma value) 4216 { 4217 /* Make VALUE PC-relative. */ 4218 value -= sec->output_section->vma + offset; 4219 4220 /* Apply any in-place addend. */ 4221 value += bfd_get_32 (sec->owner, sec->contents + offset); 4222 4223 bfd_put_32 (sec->owner, value, sec->contents + offset); 4224 } 4225 4226 /* Finish up dynamic symbol handling. We set the contents of various 4227 dynamic sections here. */ 4228 4229 static bfd_boolean 4230 elf_m68k_finish_dynamic_symbol (bfd *output_bfd, 4231 struct bfd_link_info *info, 4232 struct elf_link_hash_entry *h, 4233 Elf_Internal_Sym *sym) 4234 { 4235 bfd *dynobj; 4236 4237 dynobj = elf_hash_table (info)->dynobj; 4238 4239 if (h->plt.offset != (bfd_vma) -1) 4240 { 4241 const struct elf_m68k_plt_info *plt_info; 4242 asection *splt; 4243 asection *sgot; 4244 asection *srela; 4245 bfd_vma plt_index; 4246 bfd_vma got_offset; 4247 Elf_Internal_Rela rela; 4248 bfd_byte *loc; 4249 4250 /* This symbol has an entry in the procedure linkage table. Set 4251 it up. */ 4252 4253 BFD_ASSERT (h->dynindx != -1); 4254 4255 plt_info = elf_m68k_hash_table (info)->plt_info; 4256 splt = bfd_get_linker_section (dynobj, ".plt"); 4257 sgot = bfd_get_linker_section (dynobj, ".got.plt"); 4258 srela = bfd_get_linker_section (dynobj, ".rela.plt"); 4259 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL); 4260 4261 /* Get the index in the procedure linkage table which 4262 corresponds to this symbol. This is the index of this symbol 4263 in all the symbols for which we are making plt entries. The 4264 first entry in the procedure linkage table is reserved. */ 4265 plt_index = (h->plt.offset / plt_info->size) - 1; 4266 4267 /* Get the offset into the .got table of the entry that 4268 corresponds to this function. Each .got entry is 4 bytes. 4269 The first three are reserved. */ 4270 got_offset = (plt_index + 3) * 4; 4271 4272 memcpy (splt->contents + h->plt.offset, 4273 plt_info->symbol_entry, 4274 plt_info->size); 4275 4276 elf_m68k_install_pc32 (splt, h->plt.offset + plt_info->symbol_relocs.got, 4277 (sgot->output_section->vma 4278 + sgot->output_offset 4279 + got_offset)); 4280 4281 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela), 4282 splt->contents 4283 + h->plt.offset 4284 + plt_info->symbol_resolve_entry + 2); 4285 4286 elf_m68k_install_pc32 (splt, h->plt.offset + plt_info->symbol_relocs.plt, 4287 splt->output_section->vma); 4288 4289 /* Fill in the entry in the global offset table. */ 4290 bfd_put_32 (output_bfd, 4291 (splt->output_section->vma 4292 + splt->output_offset 4293 + h->plt.offset 4294 + plt_info->symbol_resolve_entry), 4295 sgot->contents + got_offset); 4296 4297 /* Fill in the entry in the .rela.plt section. */ 4298 rela.r_offset = (sgot->output_section->vma 4299 + sgot->output_offset 4300 + got_offset); 4301 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT); 4302 rela.r_addend = 0; 4303 loc = srela->contents + plt_index * sizeof (Elf32_External_Rela); 4304 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 4305 4306 if (!h->def_regular) 4307 { 4308 /* Mark the symbol as undefined, rather than as defined in 4309 the .plt section. Leave the value alone. */ 4310 sym->st_shndx = SHN_UNDEF; 4311 } 4312 } 4313 4314 if (elf_m68k_hash_entry (h)->glist != NULL) 4315 { 4316 asection *sgot; 4317 asection *srela; 4318 struct elf_m68k_got_entry *got_entry; 4319 4320 /* This symbol has an entry in the global offset table. Set it 4321 up. */ 4322 4323 sgot = bfd_get_linker_section (dynobj, ".got"); 4324 srela = bfd_get_linker_section (dynobj, ".rela.got"); 4325 BFD_ASSERT (sgot != NULL && srela != NULL); 4326 4327 got_entry = elf_m68k_hash_entry (h)->glist; 4328 4329 while (got_entry != NULL) 4330 { 4331 enum elf_m68k_reloc_type r_type; 4332 bfd_vma got_entry_offset; 4333 4334 r_type = got_entry->key_.type; 4335 got_entry_offset = got_entry->u.s2.offset &~ (bfd_vma) 1; 4336 4337 /* If this is a -Bsymbolic link, and the symbol is defined 4338 locally, we just want to emit a RELATIVE reloc. Likewise if 4339 the symbol was forced to be local because of a version file. 4340 The entry in the global offset table already have been 4341 initialized in the relocate_section function. */ 4342 if (info->shared 4343 && SYMBOL_REFERENCES_LOCAL (info, h)) 4344 { 4345 bfd_vma relocation; 4346 4347 relocation = bfd_get_signed_32 (output_bfd, 4348 (sgot->contents 4349 + got_entry_offset)); 4350 4351 /* Undo TP bias. */ 4352 switch (elf_m68k_reloc_got_type (r_type)) 4353 { 4354 case R_68K_GOT32O: 4355 case R_68K_TLS_LDM32: 4356 break; 4357 4358 case R_68K_TLS_GD32: 4359 /* The value for this relocation is actually put in 4360 the second GOT slot. */ 4361 relocation = bfd_get_signed_32 (output_bfd, 4362 (sgot->contents 4363 + got_entry_offset + 4)); 4364 relocation += dtpoff_base (info); 4365 break; 4366 4367 case R_68K_TLS_IE32: 4368 relocation += tpoff_base (info); 4369 break; 4370 4371 default: 4372 BFD_ASSERT (FALSE); 4373 } 4374 4375 elf_m68k_init_got_entry_local_shared (info, 4376 output_bfd, 4377 r_type, 4378 sgot, 4379 got_entry_offset, 4380 relocation, 4381 srela); 4382 } 4383 else 4384 { 4385 Elf_Internal_Rela rela; 4386 4387 /* Put zeros to GOT slots that will be initialized 4388 at run-time. */ 4389 { 4390 bfd_vma n_slots; 4391 4392 n_slots = elf_m68k_reloc_got_n_slots (got_entry->key_.type); 4393 while (n_slots--) 4394 bfd_put_32 (output_bfd, (bfd_vma) 0, 4395 (sgot->contents + got_entry_offset 4396 + 4 * n_slots)); 4397 } 4398 4399 rela.r_addend = 0; 4400 rela.r_offset = (sgot->output_section->vma 4401 + sgot->output_offset 4402 + got_entry_offset); 4403 4404 switch (elf_m68k_reloc_got_type (r_type)) 4405 { 4406 case R_68K_GOT32O: 4407 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT); 4408 elf_m68k_install_rela (output_bfd, srela, &rela); 4409 break; 4410 4411 case R_68K_TLS_GD32: 4412 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_TLS_DTPMOD32); 4413 elf_m68k_install_rela (output_bfd, srela, &rela); 4414 4415 rela.r_offset += 4; 4416 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_TLS_DTPREL32); 4417 elf_m68k_install_rela (output_bfd, srela, &rela); 4418 break; 4419 4420 case R_68K_TLS_IE32: 4421 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_TLS_TPREL32); 4422 elf_m68k_install_rela (output_bfd, srela, &rela); 4423 break; 4424 4425 default: 4426 BFD_ASSERT (FALSE); 4427 break; 4428 } 4429 } 4430 4431 got_entry = got_entry->u.s2.next; 4432 } 4433 } 4434 4435 if (h->needs_copy) 4436 { 4437 asection *s; 4438 Elf_Internal_Rela rela; 4439 bfd_byte *loc; 4440 4441 /* This symbol needs a copy reloc. Set it up. */ 4442 4443 BFD_ASSERT (h->dynindx != -1 4444 && (h->root.type == bfd_link_hash_defined 4445 || h->root.type == bfd_link_hash_defweak)); 4446 4447 s = bfd_get_linker_section (dynobj, ".rela.bss"); 4448 BFD_ASSERT (s != NULL); 4449 4450 rela.r_offset = (h->root.u.def.value 4451 + h->root.u.def.section->output_section->vma 4452 + h->root.u.def.section->output_offset); 4453 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY); 4454 rela.r_addend = 0; 4455 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela); 4456 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 4457 } 4458 4459 return TRUE; 4460 } 4461 4462 /* Finish up the dynamic sections. */ 4463 4464 static bfd_boolean 4465 elf_m68k_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) 4466 { 4467 bfd *dynobj; 4468 asection *sgot; 4469 asection *sdyn; 4470 4471 dynobj = elf_hash_table (info)->dynobj; 4472 4473 sgot = bfd_get_linker_section (dynobj, ".got.plt"); 4474 BFD_ASSERT (sgot != NULL); 4475 sdyn = bfd_get_linker_section (dynobj, ".dynamic"); 4476 4477 if (elf_hash_table (info)->dynamic_sections_created) 4478 { 4479 asection *splt; 4480 Elf32_External_Dyn *dyncon, *dynconend; 4481 4482 splt = bfd_get_linker_section (dynobj, ".plt"); 4483 BFD_ASSERT (splt != NULL && sdyn != NULL); 4484 4485 dyncon = (Elf32_External_Dyn *) sdyn->contents; 4486 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 4487 for (; dyncon < dynconend; dyncon++) 4488 { 4489 Elf_Internal_Dyn dyn; 4490 const char *name; 4491 asection *s; 4492 4493 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 4494 4495 switch (dyn.d_tag) 4496 { 4497 default: 4498 break; 4499 4500 case DT_PLTGOT: 4501 name = ".got"; 4502 goto get_vma; 4503 case DT_JMPREL: 4504 name = ".rela.plt"; 4505 get_vma: 4506 s = bfd_get_section_by_name (output_bfd, name); 4507 BFD_ASSERT (s != NULL); 4508 dyn.d_un.d_ptr = s->vma; 4509 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 4510 break; 4511 4512 case DT_PLTRELSZ: 4513 s = bfd_get_section_by_name (output_bfd, ".rela.plt"); 4514 BFD_ASSERT (s != NULL); 4515 dyn.d_un.d_val = s->size; 4516 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 4517 break; 4518 4519 case DT_RELASZ: 4520 /* The procedure linkage table relocs (DT_JMPREL) should 4521 not be included in the overall relocs (DT_RELA). 4522 Therefore, we override the DT_RELASZ entry here to 4523 make it not include the JMPREL relocs. Since the 4524 linker script arranges for .rela.plt to follow all 4525 other relocation sections, we don't have to worry 4526 about changing the DT_RELA entry. */ 4527 s = bfd_get_section_by_name (output_bfd, ".rela.plt"); 4528 if (s != NULL) 4529 dyn.d_un.d_val -= s->size; 4530 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 4531 break; 4532 } 4533 } 4534 4535 /* Fill in the first entry in the procedure linkage table. */ 4536 if (splt->size > 0) 4537 { 4538 const struct elf_m68k_plt_info *plt_info; 4539 4540 plt_info = elf_m68k_hash_table (info)->plt_info; 4541 memcpy (splt->contents, plt_info->plt0_entry, plt_info->size); 4542 4543 elf_m68k_install_pc32 (splt, plt_info->plt0_relocs.got4, 4544 (sgot->output_section->vma 4545 + sgot->output_offset 4546 + 4)); 4547 4548 elf_m68k_install_pc32 (splt, plt_info->plt0_relocs.got8, 4549 (sgot->output_section->vma 4550 + sgot->output_offset 4551 + 8)); 4552 4553 elf_section_data (splt->output_section)->this_hdr.sh_entsize 4554 = plt_info->size; 4555 } 4556 } 4557 4558 /* Fill in the first three entries in the global offset table. */ 4559 if (sgot->size > 0) 4560 { 4561 if (sdyn == NULL) 4562 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); 4563 else 4564 bfd_put_32 (output_bfd, 4565 sdyn->output_section->vma + sdyn->output_offset, 4566 sgot->contents); 4567 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); 4568 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); 4569 } 4570 4571 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; 4572 4573 return TRUE; 4574 } 4575 4576 /* Given a .data section and a .emreloc in-memory section, store 4577 relocation information into the .emreloc section which can be 4578 used at runtime to relocate the section. This is called by the 4579 linker when the --embedded-relocs switch is used. This is called 4580 after the add_symbols entry point has been called for all the 4581 objects, and before the final_link entry point is called. */ 4582 4583 bfd_boolean 4584 bfd_m68k_elf32_create_embedded_relocs (abfd, info, datasec, relsec, errmsg) 4585 bfd *abfd; 4586 struct bfd_link_info *info; 4587 asection *datasec; 4588 asection *relsec; 4589 char **errmsg; 4590 { 4591 Elf_Internal_Shdr *symtab_hdr; 4592 Elf_Internal_Sym *isymbuf = NULL; 4593 Elf_Internal_Rela *internal_relocs = NULL; 4594 Elf_Internal_Rela *irel, *irelend; 4595 bfd_byte *p; 4596 bfd_size_type amt; 4597 4598 BFD_ASSERT (! info->relocatable); 4599 4600 *errmsg = NULL; 4601 4602 if (datasec->reloc_count == 0) 4603 return TRUE; 4604 4605 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 4606 4607 /* Get a copy of the native relocations. */ 4608 internal_relocs = (_bfd_elf_link_read_relocs 4609 (abfd, datasec, NULL, (Elf_Internal_Rela *) NULL, 4610 info->keep_memory)); 4611 if (internal_relocs == NULL) 4612 goto error_return; 4613 4614 amt = (bfd_size_type) datasec->reloc_count * 12; 4615 relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt); 4616 if (relsec->contents == NULL) 4617 goto error_return; 4618 4619 p = relsec->contents; 4620 4621 irelend = internal_relocs + datasec->reloc_count; 4622 for (irel = internal_relocs; irel < irelend; irel++, p += 12) 4623 { 4624 asection *targetsec; 4625 4626 /* We are going to write a four byte longword into the runtime 4627 reloc section. The longword will be the address in the data 4628 section which must be relocated. It is followed by the name 4629 of the target section NUL-padded or truncated to 8 4630 characters. */ 4631 4632 /* We can only relocate absolute longword relocs at run time. */ 4633 if (ELF32_R_TYPE (irel->r_info) != (int) R_68K_32) 4634 { 4635 *errmsg = _("unsupported reloc type"); 4636 bfd_set_error (bfd_error_bad_value); 4637 goto error_return; 4638 } 4639 4640 /* Get the target section referred to by the reloc. */ 4641 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) 4642 { 4643 /* A local symbol. */ 4644 Elf_Internal_Sym *isym; 4645 4646 /* Read this BFD's local symbols if we haven't done so already. */ 4647 if (isymbuf == NULL) 4648 { 4649 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 4650 if (isymbuf == NULL) 4651 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, 4652 symtab_hdr->sh_info, 0, 4653 NULL, NULL, NULL); 4654 if (isymbuf == NULL) 4655 goto error_return; 4656 } 4657 4658 isym = isymbuf + ELF32_R_SYM (irel->r_info); 4659 targetsec = bfd_section_from_elf_index (abfd, isym->st_shndx); 4660 } 4661 else 4662 { 4663 unsigned long indx; 4664 struct elf_link_hash_entry *h; 4665 4666 /* An external symbol. */ 4667 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; 4668 h = elf_sym_hashes (abfd)[indx]; 4669 BFD_ASSERT (h != NULL); 4670 if (h->root.type == bfd_link_hash_defined 4671 || h->root.type == bfd_link_hash_defweak) 4672 targetsec = h->root.u.def.section; 4673 else 4674 targetsec = NULL; 4675 } 4676 4677 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p); 4678 memset (p + 4, 0, 8); 4679 if (targetsec != NULL) 4680 strncpy ((char *) p + 4, targetsec->output_section->name, 8); 4681 } 4682 4683 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) 4684 free (isymbuf); 4685 if (internal_relocs != NULL 4686 && elf_section_data (datasec)->relocs != internal_relocs) 4687 free (internal_relocs); 4688 return TRUE; 4689 4690 error_return: 4691 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) 4692 free (isymbuf); 4693 if (internal_relocs != NULL 4694 && elf_section_data (datasec)->relocs != internal_relocs) 4695 free (internal_relocs); 4696 return FALSE; 4697 } 4698 4699 /* Set target options. */ 4700 4701 void 4702 bfd_elf_m68k_set_target_options (struct bfd_link_info *info, int got_handling) 4703 { 4704 struct elf_m68k_link_hash_table *htab; 4705 bfd_boolean use_neg_got_offsets_p; 4706 bfd_boolean allow_multigot_p; 4707 bfd_boolean local_gp_p; 4708 4709 switch (got_handling) 4710 { 4711 case 0: 4712 /* --got=single. */ 4713 local_gp_p = FALSE; 4714 use_neg_got_offsets_p = FALSE; 4715 allow_multigot_p = FALSE; 4716 break; 4717 4718 case 1: 4719 /* --got=negative. */ 4720 local_gp_p = TRUE; 4721 use_neg_got_offsets_p = TRUE; 4722 allow_multigot_p = FALSE; 4723 break; 4724 4725 case 2: 4726 /* --got=multigot. */ 4727 local_gp_p = TRUE; 4728 use_neg_got_offsets_p = TRUE; 4729 allow_multigot_p = TRUE; 4730 break; 4731 4732 default: 4733 BFD_ASSERT (FALSE); 4734 return; 4735 } 4736 4737 htab = elf_m68k_hash_table (info); 4738 if (htab != NULL) 4739 { 4740 htab->local_gp_p = local_gp_p; 4741 htab->use_neg_got_offsets_p = use_neg_got_offsets_p; 4742 htab->allow_multigot_p = allow_multigot_p; 4743 } 4744 } 4745 4746 static enum elf_reloc_type_class 4747 elf32_m68k_reloc_type_class (const Elf_Internal_Rela *rela) 4748 { 4749 switch ((int) ELF32_R_TYPE (rela->r_info)) 4750 { 4751 case R_68K_RELATIVE: 4752 return reloc_class_relative; 4753 case R_68K_JMP_SLOT: 4754 return reloc_class_plt; 4755 case R_68K_COPY: 4756 return reloc_class_copy; 4757 default: 4758 return reloc_class_normal; 4759 } 4760 } 4761 4762 /* Return address for Ith PLT stub in section PLT, for relocation REL 4763 or (bfd_vma) -1 if it should not be included. */ 4764 4765 static bfd_vma 4766 elf_m68k_plt_sym_val (bfd_vma i, const asection *plt, 4767 const arelent *rel ATTRIBUTE_UNUSED) 4768 { 4769 return plt->vma + (i + 1) * elf_m68k_get_plt_info (plt->owner)->size; 4770 } 4771 4772 /* Support for core dump NOTE sections. */ 4773 4774 static bfd_boolean 4775 elf_m68k_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) 4776 { 4777 int offset; 4778 size_t size; 4779 4780 switch (note->descsz) 4781 { 4782 default: 4783 return FALSE; 4784 4785 case 154: /* Linux/m68k */ 4786 /* pr_cursig */ 4787 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12); 4788 4789 /* pr_pid */ 4790 elf_tdata (abfd)->core_lwpid = bfd_get_32 (abfd, note->descdata + 22); 4791 4792 /* pr_reg */ 4793 offset = 70; 4794 size = 80; 4795 4796 break; 4797 } 4798 4799 /* Make a ".reg/999" section. */ 4800 return _bfd_elfcore_make_pseudosection (abfd, ".reg", 4801 size, note->descpos + offset); 4802 } 4803 4804 static bfd_boolean 4805 elf_m68k_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) 4806 { 4807 switch (note->descsz) 4808 { 4809 default: 4810 return FALSE; 4811 4812 case 124: /* Linux/m68k elf_prpsinfo. */ 4813 elf_tdata (abfd)->core_pid 4814 = bfd_get_32 (abfd, note->descdata + 12); 4815 elf_tdata (abfd)->core_program 4816 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); 4817 elf_tdata (abfd)->core_command 4818 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); 4819 } 4820 4821 /* Note that for some reason, a spurious space is tacked 4822 onto the end of the args in some (at least one anyway) 4823 implementations, so strip it off if it exists. */ 4824 { 4825 char *command = elf_tdata (abfd)->core_command; 4826 int n = strlen (command); 4827 4828 if (n > 0 && command[n - 1] == ' ') 4829 command[n - 1] = '\0'; 4830 } 4831 4832 return TRUE; 4833 } 4834 4835 #define TARGET_BIG_SYM bfd_elf32_m68k_vec 4836 #define TARGET_BIG_NAME "elf32-m68k" 4837 #define ELF_MACHINE_CODE EM_68K 4838 #define ELF_MAXPAGESIZE 0x2000 4839 #define elf_backend_create_dynamic_sections \ 4840 _bfd_elf_create_dynamic_sections 4841 #define bfd_elf32_bfd_link_hash_table_create \ 4842 elf_m68k_link_hash_table_create 4843 /* ??? Should it be this macro or bfd_elfNN_bfd_link_hash_table_create? */ 4844 #define bfd_elf32_bfd_link_hash_table_free \ 4845 elf_m68k_link_hash_table_free 4846 #define bfd_elf32_bfd_final_link bfd_elf_final_link 4847 4848 #define elf_backend_check_relocs elf_m68k_check_relocs 4849 #define elf_backend_always_size_sections \ 4850 elf_m68k_always_size_sections 4851 #define elf_backend_adjust_dynamic_symbol \ 4852 elf_m68k_adjust_dynamic_symbol 4853 #define elf_backend_size_dynamic_sections \ 4854 elf_m68k_size_dynamic_sections 4855 #define elf_backend_final_write_processing elf_m68k_final_write_processing 4856 #define elf_backend_init_index_section _bfd_elf_init_1_index_section 4857 #define elf_backend_relocate_section elf_m68k_relocate_section 4858 #define elf_backend_finish_dynamic_symbol \ 4859 elf_m68k_finish_dynamic_symbol 4860 #define elf_backend_finish_dynamic_sections \ 4861 elf_m68k_finish_dynamic_sections 4862 #define elf_backend_gc_mark_hook elf_m68k_gc_mark_hook 4863 #define elf_backend_gc_sweep_hook elf_m68k_gc_sweep_hook 4864 #define elf_backend_copy_indirect_symbol elf_m68k_copy_indirect_symbol 4865 #define bfd_elf32_bfd_merge_private_bfd_data \ 4866 elf32_m68k_merge_private_bfd_data 4867 #define bfd_elf32_bfd_set_private_flags \ 4868 elf32_m68k_set_private_flags 4869 #define bfd_elf32_bfd_print_private_bfd_data \ 4870 elf32_m68k_print_private_bfd_data 4871 #define elf_backend_reloc_type_class elf32_m68k_reloc_type_class 4872 #define elf_backend_plt_sym_val elf_m68k_plt_sym_val 4873 #define elf_backend_object_p elf32_m68k_object_p 4874 #define elf_backend_grok_prstatus elf_m68k_grok_prstatus 4875 #define elf_backend_grok_psinfo elf_m68k_grok_psinfo 4876 4877 #define elf_backend_can_gc_sections 1 4878 #define elf_backend_can_refcount 1 4879 #define elf_backend_want_got_plt 1 4880 #define elf_backend_plt_readonly 1 4881 #define elf_backend_want_plt_sym 0 4882 #define elf_backend_got_header_size 12 4883 #define elf_backend_rela_normal 1 4884 4885 #include "elf32-target.h" 4886
Indexes created Sat Mar 28 00:23:22 UTC 2026