1/* Motorola 68k series support for 32-bit ELF 2 Copyright (C) 1993-2022 Free Software Foundation, Inc. 3 4 This file is part of BFD, the Binary File Descriptor library. 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program; if not, write to the Free Software 18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 19 MA 02110-1301, USA. */ 20 21#include "sysdep.h" 22#include "bfd.h" 23#include "bfdlink.h" 24#include "libbfd.h" 25#include "elf-bfd.h" 26#include "elf/m68k.h" 27#include "opcode/m68k.h" 28#include "cpu-m68k.h" 29#include "elf32-m68k.h" 30 31static bool 32elf_m68k_discard_copies (struct elf_link_hash_entry *, void *); 33 34static 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, 4,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_32", false, 0, 0xffffffff,false), 38 HOWTO(R_68K_16, 0, 2,16, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_16", false, 0, 0x0000ffff,false), 39 HOWTO(R_68K_8, 0, 1, 8, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_8", false, 0, 0x000000ff,false), 40 HOWTO(R_68K_PC32, 0, 4,32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PC32", false, 0, 0xffffffff,true), 41 HOWTO(R_68K_PC16, 0, 2,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC16", false, 0, 0x0000ffff,true), 42 HOWTO(R_68K_PC8, 0, 1, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC8", false, 0, 0x000000ff,true), 43 HOWTO(R_68K_GOT32, 0, 4,32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32", false, 0, 0xffffffff,true), 44 HOWTO(R_68K_GOT16, 0, 2,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16", false, 0, 0x0000ffff,true), 45 HOWTO(R_68K_GOT8, 0, 1, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8", false, 0, 0x000000ff,true), 46 HOWTO(R_68K_GOT32O, 0, 4,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32O", false, 0, 0xffffffff,false), 47 HOWTO(R_68K_GOT16O, 0, 2,16, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16O", false, 0, 0x0000ffff,false), 48 HOWTO(R_68K_GOT8O, 0, 1, 8, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8O", false, 0, 0x000000ff,false), 49 HOWTO(R_68K_PLT32, 0, 4,32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32", false, 0, 0xffffffff,true), 50 HOWTO(R_68K_PLT16, 0, 2,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16", false, 0, 0x0000ffff,true), 51 HOWTO(R_68K_PLT8, 0, 1, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8", false, 0, 0x000000ff,true), 52 HOWTO(R_68K_PLT32O, 0, 4,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32O", false, 0, 0xffffffff,false), 53 HOWTO(R_68K_PLT16O, 0, 2,16, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16O", false, 0, 0x0000ffff,false), 54 HOWTO(R_68K_PLT8O, 0, 1, 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, 4,32, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_GLOB_DAT", false, 0, 0xffffffff,false), 57 HOWTO(R_68K_JMP_SLOT, 0, 4,32, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_JMP_SLOT", false, 0, 0xffffffff,false), 58 HOWTO(R_68K_RELATIVE, 0, 4,32, 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 4, /* size */ 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 4, /* size */ 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 4, /* size */ 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 2, /* size */ 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 1, /* size */ 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 4, /* size */ 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 2, /* size */ 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 1, /* size */ 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 4, /* size */ 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 2, /* size */ 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 1, /* size */ 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 4, /* size */ 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 2, /* size */ 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 1, /* size */ 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 4, /* size */ 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 2, /* size */ 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 1, /* size */ 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 4, /* size */ 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 4, /* size */ 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 4, /* size */ 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 346static bool 347rtype_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 /* xgettext:c-format */ 354 _bfd_error_handler (_("%pB: unsupported relocation type %#x"), 355 abfd, indx); 356 bfd_set_error (bfd_error_bad_value); 357 return false; 358 } 359 cache_ptr->howto = &howto_table[indx]; 360 return true; 361} 362 363#define elf_info_to_howto rtype_to_howto 364 365static const struct 366{ 367 bfd_reloc_code_real_type bfd_val; 368 int elf_val; 369} 370 reloc_map[] = 371{ 372 { BFD_RELOC_NONE, R_68K_NONE }, 373 { BFD_RELOC_32, R_68K_32 }, 374 { BFD_RELOC_16, R_68K_16 }, 375 { BFD_RELOC_8, R_68K_8 }, 376 { BFD_RELOC_32_PCREL, R_68K_PC32 }, 377 { BFD_RELOC_16_PCREL, R_68K_PC16 }, 378 { BFD_RELOC_8_PCREL, R_68K_PC8 }, 379 { BFD_RELOC_32_GOT_PCREL, R_68K_GOT32 }, 380 { BFD_RELOC_16_GOT_PCREL, R_68K_GOT16 }, 381 { BFD_RELOC_8_GOT_PCREL, R_68K_GOT8 }, 382 { BFD_RELOC_32_GOTOFF, R_68K_GOT32O }, 383 { BFD_RELOC_16_GOTOFF, R_68K_GOT16O }, 384 { BFD_RELOC_8_GOTOFF, R_68K_GOT8O }, 385 { BFD_RELOC_32_PLT_PCREL, R_68K_PLT32 }, 386 { BFD_RELOC_16_PLT_PCREL, R_68K_PLT16 }, 387 { BFD_RELOC_8_PLT_PCREL, R_68K_PLT8 }, 388 { BFD_RELOC_32_PLTOFF, R_68K_PLT32O }, 389 { BFD_RELOC_16_PLTOFF, R_68K_PLT16O }, 390 { BFD_RELOC_8_PLTOFF, R_68K_PLT8O }, 391 { BFD_RELOC_NONE, R_68K_COPY }, 392 { BFD_RELOC_68K_GLOB_DAT, R_68K_GLOB_DAT }, 393 { BFD_RELOC_68K_JMP_SLOT, R_68K_JMP_SLOT }, 394 { BFD_RELOC_68K_RELATIVE, R_68K_RELATIVE }, 395 { BFD_RELOC_CTOR, R_68K_32 }, 396 { BFD_RELOC_VTABLE_INHERIT, R_68K_GNU_VTINHERIT }, 397 { BFD_RELOC_VTABLE_ENTRY, R_68K_GNU_VTENTRY }, 398 { BFD_RELOC_68K_TLS_GD32, R_68K_TLS_GD32 }, 399 { BFD_RELOC_68K_TLS_GD16, R_68K_TLS_GD16 }, 400 { BFD_RELOC_68K_TLS_GD8, R_68K_TLS_GD8 }, 401 { BFD_RELOC_68K_TLS_LDM32, R_68K_TLS_LDM32 }, 402 { BFD_RELOC_68K_TLS_LDM16, R_68K_TLS_LDM16 }, 403 { BFD_RELOC_68K_TLS_LDM8, R_68K_TLS_LDM8 }, 404 { BFD_RELOC_68K_TLS_LDO32, R_68K_TLS_LDO32 }, 405 { BFD_RELOC_68K_TLS_LDO16, R_68K_TLS_LDO16 }, 406 { BFD_RELOC_68K_TLS_LDO8, R_68K_TLS_LDO8 }, 407 { BFD_RELOC_68K_TLS_IE32, R_68K_TLS_IE32 }, 408 { BFD_RELOC_68K_TLS_IE16, R_68K_TLS_IE16 }, 409 { BFD_RELOC_68K_TLS_IE8, R_68K_TLS_IE8 }, 410 { BFD_RELOC_68K_TLS_LE32, R_68K_TLS_LE32 }, 411 { BFD_RELOC_68K_TLS_LE16, R_68K_TLS_LE16 }, 412 { BFD_RELOC_68K_TLS_LE8, R_68K_TLS_LE8 }, 413}; 414 415static reloc_howto_type * 416reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, 417 bfd_reloc_code_real_type code) 418{ 419 unsigned int i; 420 for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++) 421 { 422 if (reloc_map[i].bfd_val == code) 423 return &howto_table[reloc_map[i].elf_val]; 424 } 425 return 0; 426} 427 428static reloc_howto_type * 429reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name) 430{ 431 unsigned int i; 432 433 for (i = 0; i < sizeof (howto_table) / sizeof (howto_table[0]); i++) 434 if (howto_table[i].name != NULL 435 && strcasecmp (howto_table[i].name, r_name) == 0) 436 return &howto_table[i]; 437 438 return NULL; 439} 440 441#define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup 442#define bfd_elf32_bfd_reloc_name_lookup reloc_name_lookup 443#define ELF_ARCH bfd_arch_m68k 444#define ELF_TARGET_ID M68K_ELF_DATA 445 446/* Functions for the m68k ELF linker. */ 447 448/* The name of the dynamic interpreter. This is put in the .interp 449 section. */ 450 451#define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" 452 453/* Describes one of the various PLT styles. */ 454 455struct elf_m68k_plt_info 456{ 457 /* The size of each PLT entry. */ 458 bfd_vma size; 459 460 /* The template for the first PLT entry. */ 461 const bfd_byte *plt0_entry; 462 463 /* Offsets of fields in PLT0_ENTRY that require R_68K_PC32 relocations. 464 The comments by each member indicate the value that the relocation 465 is against. */ 466 struct { 467 unsigned int got4; /* .got + 4 */ 468 unsigned int got8; /* .got + 8 */ 469 } plt0_relocs; 470 471 /* The template for a symbol's PLT entry. */ 472 const bfd_byte *symbol_entry; 473 474 /* Offsets of fields in SYMBOL_ENTRY that require R_68K_PC32 relocations. 475 The comments by each member indicate the value that the relocation 476 is against. */ 477 struct { 478 unsigned int got; /* the symbol's .got.plt entry */ 479 unsigned int plt; /* .plt */ 480 } symbol_relocs; 481 482 /* The offset of the resolver stub from the start of SYMBOL_ENTRY. 483 The stub starts with "move.l #relocoffset,%d0". */ 484 bfd_vma symbol_resolve_entry; 485}; 486 487/* The size in bytes of an entry in the procedure linkage table. */ 488 489#define PLT_ENTRY_SIZE 20 490 491/* The first entry in a procedure linkage table looks like this. See 492 the SVR4 ABI m68k supplement to see how this works. */ 493 494static const bfd_byte elf_m68k_plt0_entry[PLT_ENTRY_SIZE] = 495{ 496 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */ 497 0, 0, 0, 2, /* + (.got + 4) - . */ 498 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,addr]) */ 499 0, 0, 0, 2, /* + (.got + 8) - . */ 500 0, 0, 0, 0 /* pad out to 20 bytes. */ 501}; 502 503/* Subsequent entries in a procedure linkage table look like this. */ 504 505static const bfd_byte elf_m68k_plt_entry[PLT_ENTRY_SIZE] = 506{ 507 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,symbol@GOTPC]) */ 508 0, 0, 0, 2, /* + (.got.plt entry) - . */ 509 0x2f, 0x3c, /* move.l #offset,-(%sp) */ 510 0, 0, 0, 0, /* + reloc index */ 511 0x60, 0xff, /* bra.l .plt */ 512 0, 0, 0, 0 /* + .plt - . */ 513}; 514 515static const struct elf_m68k_plt_info elf_m68k_plt_info = 516{ 517 PLT_ENTRY_SIZE, 518 elf_m68k_plt0_entry, { 4, 12 }, 519 elf_m68k_plt_entry, { 4, 16 }, 8 520}; 521 522#define ISAB_PLT_ENTRY_SIZE 24 523 524static const bfd_byte elf_isab_plt0_entry[ISAB_PLT_ENTRY_SIZE] = 525{ 526 0x20, 0x3c, /* move.l #offset,%d0 */ 527 0, 0, 0, 0, /* + (.got + 4) - . */ 528 0x2f, 0x3b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l),-(%sp) */ 529 0x20, 0x3c, /* move.l #offset,%d0 */ 530 0, 0, 0, 0, /* + (.got + 8) - . */ 531 0x20, 0x7b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l), %a0 */ 532 0x4e, 0xd0, /* jmp (%a0) */ 533 0x4e, 0x71 /* nop */ 534}; 535 536/* Subsequent entries in a procedure linkage table look like this. */ 537 538static const bfd_byte elf_isab_plt_entry[ISAB_PLT_ENTRY_SIZE] = 539{ 540 0x20, 0x3c, /* move.l #offset,%d0 */ 541 0, 0, 0, 0, /* + (.got.plt entry) - . */ 542 0x20, 0x7b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l), %a0 */ 543 0x4e, 0xd0, /* jmp (%a0) */ 544 0x2f, 0x3c, /* move.l #offset,-(%sp) */ 545 0, 0, 0, 0, /* + reloc index */ 546 0x60, 0xff, /* bra.l .plt */ 547 0, 0, 0, 0 /* + .plt - . */ 548}; 549 550static const struct elf_m68k_plt_info elf_isab_plt_info = 551{ 552 ISAB_PLT_ENTRY_SIZE, 553 elf_isab_plt0_entry, { 2, 12 }, 554 elf_isab_plt_entry, { 2, 20 }, 12 555}; 556 557#define ISAC_PLT_ENTRY_SIZE 24 558 559static const bfd_byte elf_isac_plt0_entry[ISAC_PLT_ENTRY_SIZE] = 560{ 561 0x20, 0x3c, /* move.l #offset,%d0 */ 562 0, 0, 0, 0, /* replaced with .got + 4 - . */ 563 0x2e, 0xbb, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l),(%sp) */ 564 0x20, 0x3c, /* move.l #offset,%d0 */ 565 0, 0, 0, 0, /* replaced with .got + 8 - . */ 566 0x20, 0x7b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l), %a0 */ 567 0x4e, 0xd0, /* jmp (%a0) */ 568 0x4e, 0x71 /* nop */ 569}; 570 571/* Subsequent entries in a procedure linkage table look like this. */ 572 573static const bfd_byte elf_isac_plt_entry[ISAC_PLT_ENTRY_SIZE] = 574{ 575 0x20, 0x3c, /* move.l #offset,%d0 */ 576 0, 0, 0, 0, /* replaced with (.got entry) - . */ 577 0x20, 0x7b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l), %a0 */ 578 0x4e, 0xd0, /* jmp (%a0) */ 579 0x2f, 0x3c, /* move.l #offset,-(%sp) */ 580 0, 0, 0, 0, /* replaced with offset into relocation table */ 581 0x61, 0xff, /* bsr.l .plt */ 582 0, 0, 0, 0 /* replaced with .plt - . */ 583}; 584 585static const struct elf_m68k_plt_info elf_isac_plt_info = 586{ 587 ISAC_PLT_ENTRY_SIZE, 588 elf_isac_plt0_entry, { 2, 12}, 589 elf_isac_plt_entry, { 2, 20 }, 12 590}; 591 592#define CPU32_PLT_ENTRY_SIZE 24 593/* Procedure linkage table entries for the cpu32 */ 594static const bfd_byte elf_cpu32_plt0_entry[CPU32_PLT_ENTRY_SIZE] = 595{ 596 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */ 597 0, 0, 0, 2, /* + (.got + 4) - . */ 598 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */ 599 0, 0, 0, 2, /* + (.got + 8) - . */ 600 0x4e, 0xd1, /* jmp %a1@ */ 601 0, 0, 0, 0, /* pad out to 24 bytes. */ 602 0, 0 603}; 604 605static const bfd_byte elf_cpu32_plt_entry[CPU32_PLT_ENTRY_SIZE] = 606{ 607 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */ 608 0, 0, 0, 2, /* + (.got.plt entry) - . */ 609 0x4e, 0xd1, /* jmp %a1@ */ 610 0x2f, 0x3c, /* move.l #offset,-(%sp) */ 611 0, 0, 0, 0, /* + reloc index */ 612 0x60, 0xff, /* bra.l .plt */ 613 0, 0, 0, 0, /* + .plt - . */ 614 0, 0 615}; 616 617static const struct elf_m68k_plt_info elf_cpu32_plt_info = 618{ 619 CPU32_PLT_ENTRY_SIZE, 620 elf_cpu32_plt0_entry, { 4, 12 }, 621 elf_cpu32_plt_entry, { 4, 18 }, 10 622}; 623 624/* The m68k linker needs to keep track of the number of relocs that it 625 decides to copy in check_relocs for each symbol. This is so that it 626 can discard PC relative relocs if it doesn't need them when linking 627 with -Bsymbolic. We store the information in a field extending the 628 regular ELF linker hash table. */ 629 630/* This structure keeps track of the number of PC relative relocs we have 631 copied for a given symbol. */ 632 633struct elf_m68k_pcrel_relocs_copied 634{ 635 /* Next section. */ 636 struct elf_m68k_pcrel_relocs_copied *next; 637 /* A section in dynobj. */ 638 asection *section; 639 /* Number of relocs copied in this section. */ 640 bfd_size_type count; 641}; 642 643/* Forward declaration. */ 644struct elf_m68k_got_entry; 645 646/* m68k ELF linker hash entry. */ 647 648struct elf_m68k_link_hash_entry 649{ 650 struct elf_link_hash_entry root; 651 652 /* Number of PC relative relocs copied for this symbol. */ 653 struct elf_m68k_pcrel_relocs_copied *pcrel_relocs_copied; 654 655 /* Key to got_entries. */ 656 unsigned long got_entry_key; 657 658 /* List of GOT entries for this symbol. This list is build during 659 offset finalization and is used within elf_m68k_finish_dynamic_symbol 660 to traverse all GOT entries for a particular symbol. 661 662 ??? We could've used root.got.glist field instead, but having 663 a separate field is cleaner. */ 664 struct elf_m68k_got_entry *glist; 665}; 666 667#define elf_m68k_hash_entry(ent) ((struct elf_m68k_link_hash_entry *) (ent)) 668 669/* Key part of GOT entry in hashtable. */ 670struct elf_m68k_got_entry_key 671{ 672 /* BFD in which this symbol was defined. NULL for global symbols. */ 673 const bfd *bfd; 674 675 /* Symbol index. Either local symbol index or h->got_entry_key. */ 676 unsigned long symndx; 677 678 /* Type is one of R_68K_GOT{8, 16, 32}O, R_68K_TLS_GD{8, 16, 32}, 679 R_68K_TLS_LDM{8, 16, 32} or R_68K_TLS_IE{8, 16, 32}. 680 681 From perspective of hashtable key, only elf_m68k_got_reloc_type (type) 682 matters. That is, we distinguish between, say, R_68K_GOT16O 683 and R_68K_GOT32O when allocating offsets, but they are considered to be 684 the same when searching got->entries. */ 685 enum elf_m68k_reloc_type type; 686}; 687 688/* Size of the GOT offset suitable for relocation. */ 689enum elf_m68k_got_offset_size { R_8, R_16, R_32, R_LAST }; 690 691/* Entry of the GOT. */ 692struct elf_m68k_got_entry 693{ 694 /* GOT entries are put into a got->entries hashtable. This is the key. */ 695 struct elf_m68k_got_entry_key key_; 696 697 /* GOT entry data. We need s1 before offset finalization and s2 after. */ 698 union 699 { 700 struct 701 { 702 /* Number of times this entry is referenced. */ 703 bfd_vma refcount; 704 } s1; 705 706 struct 707 { 708 /* Offset from the start of .got section. To calculate offset relative 709 to GOT pointer one should subtract got->offset from this value. */ 710 bfd_vma offset; 711 712 /* Pointer to the next GOT entry for this global symbol. 713 Symbols have at most one entry in one GOT, but might 714 have entries in more than one GOT. 715 Root of this list is h->glist. 716 NULL for local symbols. */ 717 struct elf_m68k_got_entry *next; 718 } s2; 719 } u; 720}; 721 722/* Return representative type for relocation R_TYPE. 723 This is used to avoid enumerating many relocations in comparisons, 724 switches etc. */ 725 726static enum elf_m68k_reloc_type 727elf_m68k_reloc_got_type (enum elf_m68k_reloc_type r_type) 728{ 729 switch (r_type) 730 { 731 /* In most cases R_68K_GOTx relocations require the very same 732 handling as R_68K_GOT32O relocation. In cases when we need 733 to distinguish between the two, we use explicitly compare against 734 r_type. */ 735 case R_68K_GOT32: 736 case R_68K_GOT16: 737 case R_68K_GOT8: 738 case R_68K_GOT32O: 739 case R_68K_GOT16O: 740 case R_68K_GOT8O: 741 return R_68K_GOT32O; 742 743 case R_68K_TLS_GD32: 744 case R_68K_TLS_GD16: 745 case R_68K_TLS_GD8: 746 return R_68K_TLS_GD32; 747 748 case R_68K_TLS_LDM32: 749 case R_68K_TLS_LDM16: 750 case R_68K_TLS_LDM8: 751 return R_68K_TLS_LDM32; 752 753 case R_68K_TLS_IE32: 754 case R_68K_TLS_IE16: 755 case R_68K_TLS_IE8: 756 return R_68K_TLS_IE32; 757 758 default: 759 BFD_ASSERT (false); 760 return 0; 761 } 762} 763 764/* Return size of the GOT entry offset for relocation R_TYPE. */ 765 766static enum elf_m68k_got_offset_size 767elf_m68k_reloc_got_offset_size (enum elf_m68k_reloc_type r_type) 768{ 769 switch (r_type) 770 { 771 case R_68K_GOT32: case R_68K_GOT16: case R_68K_GOT8: 772 case R_68K_GOT32O: case R_68K_TLS_GD32: case R_68K_TLS_LDM32: 773 case R_68K_TLS_IE32: 774 return R_32; 775 776 case R_68K_GOT16O: case R_68K_TLS_GD16: case R_68K_TLS_LDM16: 777 case R_68K_TLS_IE16: 778 return R_16; 779 780 case R_68K_GOT8O: case R_68K_TLS_GD8: case R_68K_TLS_LDM8: 781 case R_68K_TLS_IE8: 782 return R_8; 783 784 default: 785 BFD_ASSERT (false); 786 return 0; 787 } 788} 789 790/* Return number of GOT entries we need to allocate in GOT for 791 relocation R_TYPE. */ 792 793static bfd_vma 794elf_m68k_reloc_got_n_slots (enum elf_m68k_reloc_type r_type) 795{ 796 switch (elf_m68k_reloc_got_type (r_type)) 797 { 798 case R_68K_GOT32O: 799 case R_68K_TLS_IE32: 800 return 1; 801 802 case R_68K_TLS_GD32: 803 case R_68K_TLS_LDM32: 804 return 2; 805 806 default: 807 BFD_ASSERT (false); 808 return 0; 809 } 810} 811 812/* Return TRUE if relocation R_TYPE is a TLS one. */ 813 814static bool 815elf_m68k_reloc_tls_p (enum elf_m68k_reloc_type r_type) 816{ 817 switch (r_type) 818 { 819 case R_68K_TLS_GD32: case R_68K_TLS_GD16: case R_68K_TLS_GD8: 820 case R_68K_TLS_LDM32: case R_68K_TLS_LDM16: case R_68K_TLS_LDM8: 821 case R_68K_TLS_LDO32: case R_68K_TLS_LDO16: case R_68K_TLS_LDO8: 822 case R_68K_TLS_IE32: case R_68K_TLS_IE16: case R_68K_TLS_IE8: 823 case R_68K_TLS_LE32: case R_68K_TLS_LE16: case R_68K_TLS_LE8: 824 case R_68K_TLS_DTPMOD32: case R_68K_TLS_DTPREL32: case R_68K_TLS_TPREL32: 825 return true; 826 827 default: 828 return false; 829 } 830} 831 832/* Data structure representing a single GOT. */ 833struct elf_m68k_got 834{ 835 /* Hashtable of 'struct elf_m68k_got_entry's. 836 Starting size of this table is the maximum number of 837 R_68K_GOT8O entries. */ 838 htab_t entries; 839 840 /* Number of R_x slots in this GOT. Some (e.g., TLS) entries require 841 several GOT slots. 842 843 n_slots[R_8] is the count of R_8 slots in this GOT. 844 n_slots[R_16] is the cumulative count of R_8 and R_16 slots 845 in this GOT. 846 n_slots[R_32] is the cumulative count of R_8, R_16 and R_32 slots 847 in this GOT. This is the total number of slots. */ 848 bfd_vma n_slots[R_LAST]; 849 850 /* Number of local (entry->key_.h == NULL) slots in this GOT. 851 This is only used to properly calculate size of .rela.got section; 852 see elf_m68k_partition_multi_got. */ 853 bfd_vma local_n_slots; 854 855 /* Offset of this GOT relative to beginning of .got section. */ 856 bfd_vma offset; 857}; 858 859/* BFD and its GOT. This is an entry in multi_got->bfd2got hashtable. */ 860struct elf_m68k_bfd2got_entry 861{ 862 /* BFD. */ 863 const bfd *bfd; 864 865 /* Assigned GOT. Before partitioning multi-GOT each BFD has its own 866 GOT structure. After partitioning several BFD's might [and often do] 867 share a single GOT. */ 868 struct elf_m68k_got *got; 869}; 870 871/* The main data structure holding all the pieces. */ 872struct elf_m68k_multi_got 873{ 874 /* Hashtable mapping each BFD to its GOT. If a BFD doesn't have an entry 875 here, then it doesn't need a GOT (this includes the case of a BFD 876 having an empty GOT). 877 878 ??? This hashtable can be replaced by an array indexed by bfd->id. */ 879 htab_t bfd2got; 880 881 /* Next symndx to assign a global symbol. 882 h->got_entry_key is initialized from this counter. */ 883 unsigned long global_symndx; 884}; 885 886/* m68k ELF linker hash table. */ 887 888struct elf_m68k_link_hash_table 889{ 890 struct elf_link_hash_table root; 891 892 /* The PLT format used by this link, or NULL if the format has not 893 yet been chosen. */ 894 const struct elf_m68k_plt_info *plt_info; 895 896 /* True, if GP is loaded within each function which uses it. 897 Set to TRUE when GOT negative offsets or multi-GOT is enabled. */ 898 bool local_gp_p; 899 900 /* Switch controlling use of negative offsets to double the size of GOTs. */ 901 bool use_neg_got_offsets_p; 902 903 /* Switch controlling generation of multiple GOTs. */ 904 bool allow_multigot_p; 905 906 /* Multi-GOT data structure. */ 907 struct elf_m68k_multi_got multi_got_; 908}; 909 910/* Get the m68k ELF linker hash table from a link_info structure. */ 911 912#define elf_m68k_hash_table(p) \ 913 ((is_elf_hash_table ((p)->hash) \ 914 && elf_hash_table_id (elf_hash_table (p)) == M68K_ELF_DATA) \ 915 ? (struct elf_m68k_link_hash_table *) (p)->hash : NULL) 916 917/* Shortcut to multi-GOT data. */ 918#define elf_m68k_multi_got(INFO) (&elf_m68k_hash_table (INFO)->multi_got_) 919 920/* Create an entry in an m68k ELF linker hash table. */ 921 922static struct bfd_hash_entry * 923elf_m68k_link_hash_newfunc (struct bfd_hash_entry *entry, 924 struct bfd_hash_table *table, 925 const char *string) 926{ 927 struct bfd_hash_entry *ret = entry; 928 929 /* Allocate the structure if it has not already been allocated by a 930 subclass. */ 931 if (ret == NULL) 932 ret = bfd_hash_allocate (table, 933 sizeof (struct elf_m68k_link_hash_entry)); 934 if (ret == NULL) 935 return ret; 936 937 /* Call the allocation method of the superclass. */ 938 ret = _bfd_elf_link_hash_newfunc (ret, table, string); 939 if (ret != NULL) 940 { 941 elf_m68k_hash_entry (ret)->pcrel_relocs_copied = NULL; 942 elf_m68k_hash_entry (ret)->got_entry_key = 0; 943 elf_m68k_hash_entry (ret)->glist = NULL; 944 } 945 946 return ret; 947} 948 949/* Destroy an m68k ELF linker hash table. */ 950 951static void 952elf_m68k_link_hash_table_free (bfd *obfd) 953{ 954 struct elf_m68k_link_hash_table *htab; 955 956 htab = (struct elf_m68k_link_hash_table *) obfd->link.hash; 957 958 if (htab->multi_got_.bfd2got != NULL) 959 { 960 htab_delete (htab->multi_got_.bfd2got); 961 htab->multi_got_.bfd2got = NULL; 962 } 963 _bfd_elf_link_hash_table_free (obfd); 964} 965 966/* Create an m68k ELF linker hash table. */ 967 968static struct bfd_link_hash_table * 969elf_m68k_link_hash_table_create (bfd *abfd) 970{ 971 struct elf_m68k_link_hash_table *ret; 972 size_t amt = sizeof (struct elf_m68k_link_hash_table); 973 974 ret = (struct elf_m68k_link_hash_table *) bfd_zmalloc (amt); 975 if (ret == (struct elf_m68k_link_hash_table *) NULL) 976 return NULL; 977 978 if (!_bfd_elf_link_hash_table_init (&ret->root, abfd, 979 elf_m68k_link_hash_newfunc, 980 sizeof (struct elf_m68k_link_hash_entry), 981 M68K_ELF_DATA)) 982 { 983 free (ret); 984 return NULL; 985 } 986 ret->root.root.hash_table_free = elf_m68k_link_hash_table_free; 987 988 ret->multi_got_.global_symndx = 1; 989 990 return &ret->root.root; 991} 992 993/* Set the right machine number. */ 994 995static bool 996elf32_m68k_object_p (bfd *abfd) 997{ 998 unsigned int mach = 0; 999 unsigned features = 0; 1000 flagword eflags = elf_elfheader (abfd)->e_flags; 1001 1002 if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_M68000) 1003 features |= m68000; 1004 else if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32) 1005 features |= cpu32; 1006 else if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO) 1007 features |= fido_a; 1008 else 1009 { 1010 switch (eflags & EF_M68K_CF_ISA_MASK) 1011 { 1012 case EF_M68K_CF_ISA_A_NODIV: 1013 features |= mcfisa_a; 1014 break; 1015 case EF_M68K_CF_ISA_A: 1016 features |= mcfisa_a|mcfhwdiv; 1017 break; 1018 case EF_M68K_CF_ISA_A_PLUS: 1019 features |= mcfisa_a|mcfisa_aa|mcfhwdiv|mcfusp; 1020 break; 1021 case EF_M68K_CF_ISA_B_NOUSP: 1022 features |= mcfisa_a|mcfisa_b|mcfhwdiv; 1023 break; 1024 case EF_M68K_CF_ISA_B: 1025 features |= mcfisa_a|mcfisa_b|mcfhwdiv|mcfusp; 1026 break; 1027 case EF_M68K_CF_ISA_C: 1028 features |= mcfisa_a|mcfisa_c|mcfhwdiv|mcfusp; 1029 break; 1030 case EF_M68K_CF_ISA_C_NODIV: 1031 features |= mcfisa_a|mcfisa_c|mcfusp; 1032 break; 1033 } 1034 switch (eflags & EF_M68K_CF_MAC_MASK) 1035 { 1036 case EF_M68K_CF_MAC: 1037 features |= mcfmac; 1038 break; 1039 case EF_M68K_CF_EMAC: 1040 features |= mcfemac; 1041 break; 1042 } 1043 if (eflags & EF_M68K_CF_FLOAT) 1044 features |= cfloat; 1045 } 1046 1047 mach = bfd_m68k_features_to_mach (features); 1048 bfd_default_set_arch_mach (abfd, bfd_arch_m68k, mach); 1049 1050 return true; 1051} 1052 1053/* Somewhat reverse of elf32_m68k_object_p, this sets the e_flag 1054 field based on the machine number. */ 1055 1056static bool 1057elf_m68k_final_write_processing (bfd *abfd) 1058{ 1059 int mach = bfd_get_mach (abfd); 1060 unsigned long e_flags = elf_elfheader (abfd)->e_flags; 1061 1062 if (!e_flags) 1063 { 1064 unsigned int arch_mask; 1065 1066 arch_mask = bfd_m68k_mach_to_features (mach); 1067 1068 if (arch_mask & m68000) 1069 e_flags = EF_M68K_M68000; 1070 else if (arch_mask & cpu32) 1071 e_flags = EF_M68K_CPU32; 1072 else if (arch_mask & fido_a) 1073 e_flags = EF_M68K_FIDO; 1074 else 1075 { 1076 switch (arch_mask 1077 & (mcfisa_a | mcfisa_aa | mcfisa_b | mcfisa_c | mcfhwdiv | mcfusp)) 1078 { 1079 case mcfisa_a: 1080 e_flags |= EF_M68K_CF_ISA_A_NODIV; 1081 break; 1082 case mcfisa_a | mcfhwdiv: 1083 e_flags |= EF_M68K_CF_ISA_A; 1084 break; 1085 case mcfisa_a | mcfisa_aa | mcfhwdiv | mcfusp: 1086 e_flags |= EF_M68K_CF_ISA_A_PLUS; 1087 break; 1088 case mcfisa_a | mcfisa_b | mcfhwdiv: 1089 e_flags |= EF_M68K_CF_ISA_B_NOUSP; 1090 break; 1091 case mcfisa_a | mcfisa_b | mcfhwdiv | mcfusp: 1092 e_flags |= EF_M68K_CF_ISA_B; 1093 break; 1094 case mcfisa_a | mcfisa_c | mcfhwdiv | mcfusp: 1095 e_flags |= EF_M68K_CF_ISA_C; 1096 break; 1097 case mcfisa_a | mcfisa_c | mcfusp: 1098 e_flags |= EF_M68K_CF_ISA_C_NODIV; 1099 break; 1100 } 1101 if (arch_mask & mcfmac) 1102 e_flags |= EF_M68K_CF_MAC; 1103 else if (arch_mask & mcfemac) 1104 e_flags |= EF_M68K_CF_EMAC; 1105 if (arch_mask & cfloat) 1106 e_flags |= EF_M68K_CF_FLOAT | EF_M68K_CFV4E; 1107 } 1108 elf_elfheader (abfd)->e_flags = e_flags; 1109 } 1110 return _bfd_elf_final_write_processing (abfd); 1111} 1112 1113/* Keep m68k-specific flags in the ELF header. */ 1114 1115static bool 1116elf32_m68k_set_private_flags (bfd *abfd, flagword flags) 1117{ 1118 elf_elfheader (abfd)->e_flags = flags; 1119 elf_flags_init (abfd) = true; 1120 return true; 1121} 1122 1123/* Merge object attributes from IBFD into OBFD. Warn if 1124 there are conflicting attributes. */ 1125static bool 1126m68k_elf_merge_obj_attributes (bfd *ibfd, struct bfd_link_info *info) 1127{ 1128 bfd *obfd = info->output_bfd; 1129 obj_attribute *in_attr, *in_attrs; 1130 obj_attribute *out_attr, *out_attrs; 1131 bool ret = true; 1132 1133 in_attrs = elf_known_obj_attributes (ibfd)[OBJ_ATTR_GNU]; 1134 out_attrs = elf_known_obj_attributes (obfd)[OBJ_ATTR_GNU]; 1135 1136 in_attr = &in_attrs[Tag_GNU_M68K_ABI_FP]; 1137 out_attr = &out_attrs[Tag_GNU_M68K_ABI_FP]; 1138 1139 if (in_attr->i != out_attr->i) 1140 { 1141 int in_fp = in_attr->i & 3; 1142 int out_fp = out_attr->i & 3; 1143 static bfd *last_fp; 1144 1145 if (in_fp == 0) 1146 ; 1147 else if (out_fp == 0) 1148 { 1149 out_attr->type = ATTR_TYPE_FLAG_INT_VAL; 1150 out_attr->i ^= in_fp; 1151 last_fp = ibfd; 1152 } 1153 else if (out_fp == 1 && in_fp == 2) 1154 { 1155 _bfd_error_handler 1156 /* xgettext:c-format */ 1157 (_("%pB uses hard float, %pB uses soft float"), 1158 last_fp, ibfd); 1159 ret = false; 1160 } 1161 else if (out_fp == 2 && in_fp == 1) 1162 { 1163 _bfd_error_handler 1164 /* xgettext:c-format */ 1165 (_("%pB uses hard float, %pB uses soft float"), 1166 ibfd, last_fp); 1167 ret = false; 1168 } 1169 } 1170 1171 if (!ret) 1172 { 1173 out_attr->type = ATTR_TYPE_FLAG_INT_VAL | ATTR_TYPE_FLAG_ERROR; 1174 bfd_set_error (bfd_error_bad_value); 1175 return false; 1176 } 1177 1178 /* Merge Tag_compatibility attributes and any common GNU ones. */ 1179 return _bfd_elf_merge_object_attributes (ibfd, info); 1180} 1181 1182/* Merge backend specific data from an object file to the output 1183 object file when linking. */ 1184static bool 1185elf32_m68k_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info) 1186{ 1187 bfd *obfd = info->output_bfd; 1188 flagword out_flags; 1189 flagword in_flags; 1190 flagword out_isa; 1191 flagword in_isa; 1192 const bfd_arch_info_type *arch_info; 1193 1194 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour 1195 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 1196 /* PR 24523: For non-ELF files do not try to merge any private 1197 data, but also do not prevent the link from succeeding. */ 1198 return true; 1199 1200 /* Get the merged machine. This checks for incompatibility between 1201 Coldfire & non-Coldfire flags, incompability between different 1202 Coldfire ISAs, and incompability between different MAC types. */ 1203 arch_info = bfd_arch_get_compatible (ibfd, obfd, false); 1204 if (!arch_info) 1205 return false; 1206 1207 bfd_set_arch_mach (obfd, bfd_arch_m68k, arch_info->mach); 1208 1209 if (!m68k_elf_merge_obj_attributes (ibfd, info)) 1210 return false; 1211 1212 in_flags = elf_elfheader (ibfd)->e_flags; 1213 if (!elf_flags_init (obfd)) 1214 { 1215 elf_flags_init (obfd) = true; 1216 out_flags = in_flags; 1217 } 1218 else 1219 { 1220 out_flags = elf_elfheader (obfd)->e_flags; 1221 unsigned int variant_mask; 1222 1223 if ((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_M68000) 1224 variant_mask = 0; 1225 else if ((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32) 1226 variant_mask = 0; 1227 else if ((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO) 1228 variant_mask = 0; 1229 else 1230 variant_mask = EF_M68K_CF_ISA_MASK; 1231 1232 in_isa = (in_flags & variant_mask); 1233 out_isa = (out_flags & variant_mask); 1234 if (in_isa > out_isa) 1235 out_flags ^= in_isa ^ out_isa; 1236 if (((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32 1237 && (out_flags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO) 1238 || ((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO 1239 && (out_flags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32)) 1240 out_flags = EF_M68K_FIDO; 1241 else 1242 out_flags |= in_flags ^ in_isa; 1243 } 1244 elf_elfheader (obfd)->e_flags = out_flags; 1245 1246 return true; 1247} 1248 1249/* Display the flags field. */ 1250 1251static bool 1252elf32_m68k_print_private_bfd_data (bfd *abfd, void * ptr) 1253{ 1254 FILE *file = (FILE *) ptr; 1255 flagword eflags = elf_elfheader (abfd)->e_flags; 1256 1257 BFD_ASSERT (abfd != NULL && ptr != NULL); 1258 1259 /* Print normal ELF private data. */ 1260 _bfd_elf_print_private_bfd_data (abfd, ptr); 1261 1262 /* Ignore init flag - it may not be set, despite the flags field containing valid data. */ 1263 1264 /* xgettext:c-format */ 1265 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); 1266 1267 if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_M68000) 1268 fprintf (file, " [m68000]"); 1269 else if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32) 1270 fprintf (file, " [cpu32]"); 1271 else if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO) 1272 fprintf (file, " [fido]"); 1273 else 1274 { 1275 if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_CFV4E) 1276 fprintf (file, " [cfv4e]"); 1277 1278 if (eflags & EF_M68K_CF_ISA_MASK) 1279 { 1280 char const *isa = _("unknown"); 1281 char const *mac = _("unknown"); 1282 char const *additional = ""; 1283 1284 switch (eflags & EF_M68K_CF_ISA_MASK) 1285 { 1286 case EF_M68K_CF_ISA_A_NODIV: 1287 isa = "A"; 1288 additional = " [nodiv]"; 1289 break; 1290 case EF_M68K_CF_ISA_A: 1291 isa = "A"; 1292 break; 1293 case EF_M68K_CF_ISA_A_PLUS: 1294 isa = "A+"; 1295 break; 1296 case EF_M68K_CF_ISA_B_NOUSP: 1297 isa = "B"; 1298 additional = " [nousp]"; 1299 break; 1300 case EF_M68K_CF_ISA_B: 1301 isa = "B"; 1302 break; 1303 case EF_M68K_CF_ISA_C: 1304 isa = "C"; 1305 break; 1306 case EF_M68K_CF_ISA_C_NODIV: 1307 isa = "C"; 1308 additional = " [nodiv]"; 1309 break; 1310 } 1311 fprintf (file, " [isa %s]%s", isa, additional); 1312 1313 if (eflags & EF_M68K_CF_FLOAT) 1314 fprintf (file, " [float]"); 1315 1316 switch (eflags & EF_M68K_CF_MAC_MASK) 1317 { 1318 case 0: 1319 mac = NULL; 1320 break; 1321 case EF_M68K_CF_MAC: 1322 mac = "mac"; 1323 break; 1324 case EF_M68K_CF_EMAC: 1325 mac = "emac"; 1326 break; 1327 case EF_M68K_CF_EMAC_B: 1328 mac = "emac_b"; 1329 break; 1330 } 1331 if (mac) 1332 fprintf (file, " [%s]", mac); 1333 } 1334 } 1335 1336 fputc ('\n', file); 1337 1338 return true; 1339} 1340 1341/* Multi-GOT support implementation design: 1342 1343 Multi-GOT starts in check_relocs hook. There we scan all 1344 relocations of a BFD and build a local GOT (struct elf_m68k_got) 1345 for it. If a single BFD appears to require too many GOT slots with 1346 R_68K_GOT8O or R_68K_GOT16O relocations, we fail with notification 1347 to user. 1348 After check_relocs has been invoked for each input BFD, we have 1349 constructed a GOT for each input BFD. 1350 1351 To minimize total number of GOTs required for a particular output BFD 1352 (as some environments support only 1 GOT per output object) we try 1353 to merge some of the GOTs to share an offset space. Ideally [and in most 1354 cases] we end up with a single GOT. In cases when there are too many 1355 restricted relocations (e.g., R_68K_GOT16O relocations) we end up with 1356 several GOTs, assuming the environment can handle them. 1357 1358 Partitioning is done in elf_m68k_partition_multi_got. We start with 1359 an empty GOT and traverse bfd2got hashtable putting got_entries from 1360 local GOTs to the new 'big' one. We do that by constructing an 1361 intermediate GOT holding all the entries the local GOT has and the big 1362 GOT lacks. Then we check if there is room in the big GOT to accomodate 1363 all the entries from diff. On success we add those entries to the big 1364 GOT; on failure we start the new 'big' GOT and retry the adding of 1365 entries from the local GOT. Note that this retry will always succeed as 1366 each local GOT doesn't overflow the limits. After partitioning we 1367 end up with each bfd assigned one of the big GOTs. GOT entries in the 1368 big GOTs are initialized with GOT offsets. Note that big GOTs are 1369 positioned consequently in program space and represent a single huge GOT 1370 to the outside world. 1371 1372 After that we get to elf_m68k_relocate_section. There we 1373 adjust relocations of GOT pointer (_GLOBAL_OFFSET_TABLE_) and symbol 1374 relocations to refer to appropriate [assigned to current input_bfd] 1375 big GOT. 1376 1377 Notes: 1378 1379 GOT entry type: We have several types of GOT entries. 1380 * R_8 type is used in entries for symbols that have at least one 1381 R_68K_GOT8O or R_68K_TLS_*8 relocation. We can have at most 0x40 1382 such entries in one GOT. 1383 * R_16 type is used in entries for symbols that have at least one 1384 R_68K_GOT16O or R_68K_TLS_*16 relocation and no R_8 relocations. 1385 We can have at most 0x4000 such entries in one GOT. 1386 * R_32 type is used in all other cases. We can have as many 1387 such entries in one GOT as we'd like. 1388 When counting relocations we have to include the count of the smaller 1389 ranged relocations in the counts of the larger ranged ones in order 1390 to correctly detect overflow. 1391 1392 Sorting the GOT: In each GOT starting offsets are assigned to 1393 R_8 entries, which are followed by R_16 entries, and 1394 R_32 entries go at the end. See finalize_got_offsets for details. 1395 1396 Negative GOT offsets: To double usable offset range of GOTs we use 1397 negative offsets. As we assign entries with GOT offsets relative to 1398 start of .got section, the offset values are positive. They become 1399 negative only in relocate_section where got->offset value is 1400 subtracted from them. 1401 1402 3 special GOT entries: There are 3 special GOT entries used internally 1403 by loader. These entries happen to be placed to .got.plt section, 1404 so we don't do anything about them in multi-GOT support. 1405 1406 Memory management: All data except for hashtables 1407 multi_got->bfd2got and got->entries are allocated on 1408 elf_hash_table (info)->dynobj bfd (for this reason we pass 'info' 1409 to most functions), so we don't need to care to free them. At the 1410 moment of allocation hashtables are being linked into main data 1411 structure (multi_got), all pieces of which are reachable from 1412 elf_m68k_multi_got (info). We deallocate them in 1413 elf_m68k_link_hash_table_free. */ 1414 1415/* Initialize GOT. */ 1416 1417static void 1418elf_m68k_init_got (struct elf_m68k_got *got) 1419{ 1420 got->entries = NULL; 1421 got->n_slots[R_8] = 0; 1422 got->n_slots[R_16] = 0; 1423 got->n_slots[R_32] = 0; 1424 got->local_n_slots = 0; 1425 got->offset = (bfd_vma) -1; 1426} 1427 1428/* Destruct GOT. */ 1429 1430static void 1431elf_m68k_clear_got (struct elf_m68k_got *got) 1432{ 1433 if (got->entries != NULL) 1434 { 1435 htab_delete (got->entries); 1436 got->entries = NULL; 1437 } 1438} 1439 1440/* Create and empty GOT structure. INFO is the context where memory 1441 should be allocated. */ 1442 1443static struct elf_m68k_got * 1444elf_m68k_create_empty_got (struct bfd_link_info *info) 1445{ 1446 struct elf_m68k_got *got; 1447 1448 got = bfd_alloc (elf_hash_table (info)->dynobj, sizeof (*got)); 1449 if (got == NULL) 1450 return NULL; 1451 1452 elf_m68k_init_got (got); 1453 1454 return got; 1455} 1456 1457/* Initialize KEY. */ 1458 1459static void 1460elf_m68k_init_got_entry_key (struct elf_m68k_got_entry_key *key, 1461 struct elf_link_hash_entry *h, 1462 const bfd *abfd, unsigned long symndx, 1463 enum elf_m68k_reloc_type reloc_type) 1464{ 1465 if (elf_m68k_reloc_got_type (reloc_type) == R_68K_TLS_LDM32) 1466 /* All TLS_LDM relocations share a single GOT entry. */ 1467 { 1468 key->bfd = NULL; 1469 key->symndx = 0; 1470 } 1471 else if (h != NULL) 1472 /* Global symbols are identified with their got_entry_key. */ 1473 { 1474 key->bfd = NULL; 1475 key->symndx = elf_m68k_hash_entry (h)->got_entry_key; 1476 BFD_ASSERT (key->symndx != 0); 1477 } 1478 else 1479 /* Local symbols are identified by BFD they appear in and symndx. */ 1480 { 1481 key->bfd = abfd; 1482 key->symndx = symndx; 1483 } 1484 1485 key->type = reloc_type; 1486} 1487 1488/* Calculate hash of got_entry. 1489 ??? Is it good? */ 1490 1491static hashval_t 1492elf_m68k_got_entry_hash (const void *_entry) 1493{ 1494 const struct elf_m68k_got_entry_key *key; 1495 1496 key = &((const struct elf_m68k_got_entry *) _entry)->key_; 1497 1498 return (key->symndx 1499 + (key->bfd != NULL ? (int) key->bfd->id : -1) 1500 + elf_m68k_reloc_got_type (key->type)); 1501} 1502 1503/* Check if two got entries are equal. */ 1504 1505static int 1506elf_m68k_got_entry_eq (const void *_entry1, const void *_entry2) 1507{ 1508 const struct elf_m68k_got_entry_key *key1; 1509 const struct elf_m68k_got_entry_key *key2; 1510 1511 key1 = &((const struct elf_m68k_got_entry *) _entry1)->key_; 1512 key2 = &((const struct elf_m68k_got_entry *) _entry2)->key_; 1513 1514 return (key1->bfd == key2->bfd 1515 && key1->symndx == key2->symndx 1516 && (elf_m68k_reloc_got_type (key1->type) 1517 == elf_m68k_reloc_got_type (key2->type))); 1518} 1519 1520/* When using negative offsets, we allocate one extra R_8, one extra R_16 1521 and one extra R_32 slots to simplify handling of 2-slot entries during 1522 offset allocation -- hence -1 for R_8 slots and -2 for R_16 slots. */ 1523 1524/* Maximal number of R_8 slots in a single GOT. */ 1525#define ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT(INFO) \ 1526 (elf_m68k_hash_table (INFO)->use_neg_got_offsets_p \ 1527 ? (0x40 - 1) \ 1528 : 0x20) 1529 1530/* Maximal number of R_8 and R_16 slots in a single GOT. */ 1531#define ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT(INFO) \ 1532 (elf_m68k_hash_table (INFO)->use_neg_got_offsets_p \ 1533 ? (0x4000 - 2) \ 1534 : 0x2000) 1535 1536/* SEARCH - simply search the hashtable, don't insert new entries or fail when 1537 the entry cannot be found. 1538 FIND_OR_CREATE - search for an existing entry, but create new if there's 1539 no such. 1540 MUST_FIND - search for an existing entry and assert that it exist. 1541 MUST_CREATE - assert that there's no such entry and create new one. */ 1542enum elf_m68k_get_entry_howto 1543 { 1544 SEARCH, 1545 FIND_OR_CREATE, 1546 MUST_FIND, 1547 MUST_CREATE 1548 }; 1549 1550/* Get or create (depending on HOWTO) entry with KEY in GOT. 1551 INFO is context in which memory should be allocated (can be NULL if 1552 HOWTO is SEARCH or MUST_FIND). */ 1553 1554static struct elf_m68k_got_entry * 1555elf_m68k_get_got_entry (struct elf_m68k_got *got, 1556 const struct elf_m68k_got_entry_key *key, 1557 enum elf_m68k_get_entry_howto howto, 1558 struct bfd_link_info *info) 1559{ 1560 struct elf_m68k_got_entry entry_; 1561 struct elf_m68k_got_entry *entry; 1562 void **ptr; 1563 1564 BFD_ASSERT ((info == NULL) == (howto == SEARCH || howto == MUST_FIND)); 1565 1566 if (got->entries == NULL) 1567 /* This is the first entry in ABFD. Initialize hashtable. */ 1568 { 1569 if (howto == SEARCH) 1570 return NULL; 1571 1572 got->entries = htab_try_create (ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT 1573 (info), 1574 elf_m68k_got_entry_hash, 1575 elf_m68k_got_entry_eq, NULL); 1576 if (got->entries == NULL) 1577 { 1578 bfd_set_error (bfd_error_no_memory); 1579 return NULL; 1580 } 1581 } 1582 1583 entry_.key_ = *key; 1584 ptr = htab_find_slot (got->entries, &entry_, 1585 (howto == SEARCH || howto == MUST_FIND ? NO_INSERT 1586 : INSERT)); 1587 if (ptr == NULL) 1588 { 1589 if (howto == SEARCH) 1590 /* Entry not found. */ 1591 return NULL; 1592 1593 if (howto == MUST_FIND) 1594 abort (); 1595 1596 /* We're out of memory. */ 1597 bfd_set_error (bfd_error_no_memory); 1598 return NULL; 1599 } 1600 1601 if (*ptr == NULL) 1602 /* We didn't find the entry and we're asked to create a new one. */ 1603 { 1604 if (howto == MUST_FIND) 1605 abort (); 1606 1607 BFD_ASSERT (howto != SEARCH); 1608 1609 entry = bfd_alloc (elf_hash_table (info)->dynobj, sizeof (*entry)); 1610 if (entry == NULL) 1611 return NULL; 1612 1613 /* Initialize new entry. */ 1614 entry->key_ = *key; 1615 1616 entry->u.s1.refcount = 0; 1617 1618 /* Mark the entry as not initialized. */ 1619 entry->key_.type = R_68K_max; 1620 1621 *ptr = entry; 1622 } 1623 else 1624 /* We found the entry. */ 1625 { 1626 BFD_ASSERT (howto != MUST_CREATE); 1627 1628 entry = *ptr; 1629 } 1630 1631 return entry; 1632} 1633 1634/* Update GOT counters when merging entry of WAS type with entry of NEW type. 1635 Return the value to which ENTRY's type should be set. */ 1636 1637static enum elf_m68k_reloc_type 1638elf_m68k_update_got_entry_type (struct elf_m68k_got *got, 1639 enum elf_m68k_reloc_type was, 1640 enum elf_m68k_reloc_type new_reloc) 1641{ 1642 enum elf_m68k_got_offset_size was_size; 1643 enum elf_m68k_got_offset_size new_size; 1644 bfd_vma n_slots; 1645 1646 if (was == R_68K_max) 1647 /* The type of the entry is not initialized yet. */ 1648 { 1649 /* Update all got->n_slots counters, including n_slots[R_32]. */ 1650 was_size = R_LAST; 1651 1652 was = new_reloc; 1653 } 1654 else 1655 { 1656 /* !!! We, probably, should emit an error rather then fail on assert 1657 in such a case. */ 1658 BFD_ASSERT (elf_m68k_reloc_got_type (was) 1659 == elf_m68k_reloc_got_type (new_reloc)); 1660 1661 was_size = elf_m68k_reloc_got_offset_size (was); 1662 } 1663 1664 new_size = elf_m68k_reloc_got_offset_size (new_reloc); 1665 n_slots = elf_m68k_reloc_got_n_slots (new_reloc); 1666 1667 while (was_size > new_size) 1668 { 1669 --was_size; 1670 got->n_slots[was_size] += n_slots; 1671 } 1672 1673 if (new_reloc > was) 1674 /* Relocations are ordered from bigger got offset size to lesser, 1675 so choose the relocation type with lesser offset size. */ 1676 was = new_reloc; 1677 1678 return was; 1679} 1680 1681/* Add new or update existing entry to GOT. 1682 H, ABFD, TYPE and SYMNDX is data for the entry. 1683 INFO is a context where memory should be allocated. */ 1684 1685static struct elf_m68k_got_entry * 1686elf_m68k_add_entry_to_got (struct elf_m68k_got *got, 1687 struct elf_link_hash_entry *h, 1688 const bfd *abfd, 1689 enum elf_m68k_reloc_type reloc_type, 1690 unsigned long symndx, 1691 struct bfd_link_info *info) 1692{ 1693 struct elf_m68k_got_entry_key key_; 1694 struct elf_m68k_got_entry *entry; 1695 1696 if (h != NULL && elf_m68k_hash_entry (h)->got_entry_key == 0) 1697 elf_m68k_hash_entry (h)->got_entry_key 1698 = elf_m68k_multi_got (info)->global_symndx++; 1699 1700 elf_m68k_init_got_entry_key (&key_, h, abfd, symndx, reloc_type); 1701 1702 entry = elf_m68k_get_got_entry (got, &key_, FIND_OR_CREATE, info); 1703 if (entry == NULL) 1704 return NULL; 1705 1706 /* Determine entry's type and update got->n_slots counters. */ 1707 entry->key_.type = elf_m68k_update_got_entry_type (got, 1708 entry->key_.type, 1709 reloc_type); 1710 1711 /* Update refcount. */ 1712 ++entry->u.s1.refcount; 1713 1714 if (entry->u.s1.refcount == 1) 1715 /* We see this entry for the first time. */ 1716 { 1717 if (entry->key_.bfd != NULL) 1718 got->local_n_slots += elf_m68k_reloc_got_n_slots (entry->key_.type); 1719 } 1720 1721 BFD_ASSERT (got->n_slots[R_32] >= got->local_n_slots); 1722 1723 if ((got->n_slots[R_8] 1724 > ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info)) 1725 || (got->n_slots[R_16] 1726 > ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT (info))) 1727 /* This BFD has too many relocation. */ 1728 { 1729 if (got->n_slots[R_8] > ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info)) 1730 /* xgettext:c-format */ 1731 _bfd_error_handler (_("%pB: GOT overflow: " 1732 "number of relocations with 8-bit " 1733 "offset > %d"), 1734 abfd, 1735 ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info)); 1736 else 1737 /* xgettext:c-format */ 1738 _bfd_error_handler (_("%pB: GOT overflow: " 1739 "number of relocations with 8- or 16-bit " 1740 "offset > %d"), 1741 abfd, 1742 ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT (info)); 1743 1744 return NULL; 1745 } 1746 1747 return entry; 1748} 1749 1750/* Compute the hash value of the bfd in a bfd2got hash entry. */ 1751 1752static hashval_t 1753elf_m68k_bfd2got_entry_hash (const void *entry) 1754{ 1755 const struct elf_m68k_bfd2got_entry *e; 1756 1757 e = (const struct elf_m68k_bfd2got_entry *) entry; 1758 1759 return e->bfd->id; 1760} 1761 1762/* Check whether two hash entries have the same bfd. */ 1763 1764static int 1765elf_m68k_bfd2got_entry_eq (const void *entry1, const void *entry2) 1766{ 1767 const struct elf_m68k_bfd2got_entry *e1; 1768 const struct elf_m68k_bfd2got_entry *e2; 1769 1770 e1 = (const struct elf_m68k_bfd2got_entry *) entry1; 1771 e2 = (const struct elf_m68k_bfd2got_entry *) entry2; 1772 1773 return e1->bfd == e2->bfd; 1774} 1775 1776/* Destruct a bfd2got entry. */ 1777 1778static void 1779elf_m68k_bfd2got_entry_del (void *_entry) 1780{ 1781 struct elf_m68k_bfd2got_entry *entry; 1782 1783 entry = (struct elf_m68k_bfd2got_entry *) _entry; 1784 1785 BFD_ASSERT (entry->got != NULL); 1786 elf_m68k_clear_got (entry->got); 1787} 1788 1789/* Find existing or create new (depending on HOWTO) bfd2got entry in 1790 MULTI_GOT. ABFD is the bfd we need a GOT for. INFO is a context where 1791 memory should be allocated. */ 1792 1793static struct elf_m68k_bfd2got_entry * 1794elf_m68k_get_bfd2got_entry (struct elf_m68k_multi_got *multi_got, 1795 const bfd *abfd, 1796 enum elf_m68k_get_entry_howto howto, 1797 struct bfd_link_info *info) 1798{ 1799 struct elf_m68k_bfd2got_entry entry_; 1800 void **ptr; 1801 struct elf_m68k_bfd2got_entry *entry; 1802 1803 BFD_ASSERT ((info == NULL) == (howto == SEARCH || howto == MUST_FIND)); 1804 1805 if (multi_got->bfd2got == NULL) 1806 /* This is the first GOT. Initialize bfd2got. */ 1807 { 1808 if (howto == SEARCH) 1809 return NULL; 1810 1811 multi_got->bfd2got = htab_try_create (1, elf_m68k_bfd2got_entry_hash, 1812 elf_m68k_bfd2got_entry_eq, 1813 elf_m68k_bfd2got_entry_del); 1814 if (multi_got->bfd2got == NULL) 1815 { 1816 bfd_set_error (bfd_error_no_memory); 1817 return NULL; 1818 } 1819 } 1820 1821 entry_.bfd = abfd; 1822 ptr = htab_find_slot (multi_got->bfd2got, &entry_, 1823 (howto == SEARCH || howto == MUST_FIND ? NO_INSERT 1824 : INSERT)); 1825 if (ptr == NULL) 1826 { 1827 if (howto == SEARCH) 1828 /* Entry not found. */ 1829 return NULL; 1830 1831 if (howto == MUST_FIND) 1832 abort (); 1833 1834 /* We're out of memory. */ 1835 bfd_set_error (bfd_error_no_memory); 1836 return NULL; 1837 } 1838 1839 if (*ptr == NULL) 1840 /* Entry was not found. Create new one. */ 1841 { 1842 if (howto == MUST_FIND) 1843 abort (); 1844 1845 BFD_ASSERT (howto != SEARCH); 1846 1847 entry = ((struct elf_m68k_bfd2got_entry *) 1848 bfd_alloc (elf_hash_table (info)->dynobj, sizeof (*entry))); 1849 if (entry == NULL) 1850 return NULL; 1851 1852 entry->bfd = abfd; 1853 1854 entry->got = elf_m68k_create_empty_got (info); 1855 if (entry->got == NULL) 1856 return NULL; 1857 1858 *ptr = entry; 1859 } 1860 else 1861 { 1862 BFD_ASSERT (howto != MUST_CREATE); 1863 1864 /* Return existing entry. */ 1865 entry = *ptr; 1866 } 1867 1868 return entry; 1869} 1870 1871struct elf_m68k_can_merge_gots_arg 1872{ 1873 /* A current_got that we constructing a DIFF against. */ 1874 struct elf_m68k_got *big; 1875 1876 /* GOT holding entries not present or that should be changed in 1877 BIG. */ 1878 struct elf_m68k_got *diff; 1879 1880 /* Context where to allocate memory. */ 1881 struct bfd_link_info *info; 1882 1883 /* Error flag. */ 1884 bool error_p; 1885}; 1886 1887/* Process a single entry from the small GOT to see if it should be added 1888 or updated in the big GOT. */ 1889 1890static int 1891elf_m68k_can_merge_gots_1 (void **_entry_ptr, void *_arg) 1892{ 1893 const struct elf_m68k_got_entry *entry1; 1894 struct elf_m68k_can_merge_gots_arg *arg; 1895 const struct elf_m68k_got_entry *entry2; 1896 enum elf_m68k_reloc_type type; 1897 1898 entry1 = (const struct elf_m68k_got_entry *) *_entry_ptr; 1899 arg = (struct elf_m68k_can_merge_gots_arg *) _arg; 1900 1901 entry2 = elf_m68k_get_got_entry (arg->big, &entry1->key_, SEARCH, NULL); 1902 1903 if (entry2 != NULL) 1904 /* We found an existing entry. Check if we should update it. */ 1905 { 1906 type = elf_m68k_update_got_entry_type (arg->diff, 1907 entry2->key_.type, 1908 entry1->key_.type); 1909 1910 if (type == entry2->key_.type) 1911 /* ENTRY1 doesn't update data in ENTRY2. Skip it. 1912 To skip creation of difference entry we use the type, 1913 which we won't see in GOT entries for sure. */ 1914 type = R_68K_max; 1915 } 1916 else 1917 /* We didn't find the entry. Add entry1 to DIFF. */ 1918 { 1919 BFD_ASSERT (entry1->key_.type != R_68K_max); 1920 1921 type = elf_m68k_update_got_entry_type (arg->diff, 1922 R_68K_max, entry1->key_.type); 1923 1924 if (entry1->key_.bfd != NULL) 1925 arg->diff->local_n_slots += elf_m68k_reloc_got_n_slots (type); 1926 } 1927 1928 if (type != R_68K_max) 1929 /* Create an entry in DIFF. */ 1930 { 1931 struct elf_m68k_got_entry *entry; 1932 1933 entry = elf_m68k_get_got_entry (arg->diff, &entry1->key_, MUST_CREATE, 1934 arg->info); 1935 if (entry == NULL) 1936 { 1937 arg->error_p = true; 1938 return 0; 1939 } 1940 1941 entry->key_.type = type; 1942 } 1943 1944 return 1; 1945} 1946 1947/* Return TRUE if SMALL GOT can be added to BIG GOT without overflowing it. 1948 Construct DIFF GOT holding the entries which should be added or updated 1949 in BIG GOT to accumulate information from SMALL. 1950 INFO is the context where memory should be allocated. */ 1951 1952static bool 1953elf_m68k_can_merge_gots (struct elf_m68k_got *big, 1954 const struct elf_m68k_got *small, 1955 struct bfd_link_info *info, 1956 struct elf_m68k_got *diff) 1957{ 1958 struct elf_m68k_can_merge_gots_arg arg_; 1959 1960 BFD_ASSERT (small->offset == (bfd_vma) -1); 1961 1962 arg_.big = big; 1963 arg_.diff = diff; 1964 arg_.info = info; 1965 arg_.error_p = false; 1966 htab_traverse_noresize (small->entries, elf_m68k_can_merge_gots_1, &arg_); 1967 if (arg_.error_p) 1968 { 1969 diff->offset = 0; 1970 return false; 1971 } 1972 1973 /* Check for overflow. */ 1974 if ((big->n_slots[R_8] + arg_.diff->n_slots[R_8] 1975 > ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info)) 1976 || (big->n_slots[R_16] + arg_.diff->n_slots[R_16] 1977 > ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT (info))) 1978 return false; 1979 1980 return true; 1981} 1982 1983struct elf_m68k_merge_gots_arg 1984{ 1985 /* The BIG got. */ 1986 struct elf_m68k_got *big; 1987 1988 /* Context where memory should be allocated. */ 1989 struct bfd_link_info *info; 1990 1991 /* Error flag. */ 1992 bool error_p; 1993}; 1994 1995/* Process a single entry from DIFF got. Add or update corresponding 1996 entry in the BIG got. */ 1997 1998static int 1999elf_m68k_merge_gots_1 (void **entry_ptr, void *_arg) 2000{ 2001 const struct elf_m68k_got_entry *from; 2002 struct elf_m68k_merge_gots_arg *arg; 2003 struct elf_m68k_got_entry *to; 2004 2005 from = (const struct elf_m68k_got_entry *) *entry_ptr; 2006 arg = (struct elf_m68k_merge_gots_arg *) _arg; 2007 2008 to = elf_m68k_get_got_entry (arg->big, &from->key_, FIND_OR_CREATE, 2009 arg->info); 2010 if (to == NULL) 2011 { 2012 arg->error_p = true; 2013 return 0; 2014 } 2015 2016 BFD_ASSERT (to->u.s1.refcount == 0); 2017 /* All we need to merge is TYPE. */ 2018 to->key_.type = from->key_.type; 2019 2020 return 1; 2021} 2022 2023/* Merge data from DIFF to BIG. INFO is context where memory should be 2024 allocated. */ 2025 2026static bool 2027elf_m68k_merge_gots (struct elf_m68k_got *big, 2028 struct elf_m68k_got *diff, 2029 struct bfd_link_info *info) 2030{ 2031 if (diff->entries != NULL) 2032 /* DIFF is not empty. Merge it into BIG GOT. */ 2033 { 2034 struct elf_m68k_merge_gots_arg arg_; 2035 2036 /* Merge entries. */ 2037 arg_.big = big; 2038 arg_.info = info; 2039 arg_.error_p = false; 2040 htab_traverse_noresize (diff->entries, elf_m68k_merge_gots_1, &arg_); 2041 if (arg_.error_p) 2042 return false; 2043 2044 /* Merge counters. */ 2045 big->n_slots[R_8] += diff->n_slots[R_8]; 2046 big->n_slots[R_16] += diff->n_slots[R_16]; 2047 big->n_slots[R_32] += diff->n_slots[R_32]; 2048 big->local_n_slots += diff->local_n_slots; 2049 } 2050 else 2051 /* DIFF is empty. */ 2052 { 2053 BFD_ASSERT (diff->n_slots[R_8] == 0); 2054 BFD_ASSERT (diff->n_slots[R_16] == 0); 2055 BFD_ASSERT (diff->n_slots[R_32] == 0); 2056 BFD_ASSERT (diff->local_n_slots == 0); 2057 } 2058 2059 BFD_ASSERT (!elf_m68k_hash_table (info)->allow_multigot_p 2060 || ((big->n_slots[R_8] 2061 <= ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info)) 2062 && (big->n_slots[R_16] 2063 <= ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT (info)))); 2064 2065 return true; 2066} 2067 2068struct elf_m68k_finalize_got_offsets_arg 2069{ 2070 /* Ranges of the offsets for GOT entries. 2071 R_x entries receive offsets between offset1[R_x] and offset2[R_x]. 2072 R_x is R_8, R_16 and R_32. */ 2073 bfd_vma *offset1; 2074 bfd_vma *offset2; 2075 2076 /* Mapping from global symndx to global symbols. 2077 This is used to build lists of got entries for global symbols. */ 2078 struct elf_m68k_link_hash_entry **symndx2h; 2079 2080 bfd_vma n_ldm_entries; 2081}; 2082 2083/* Assign ENTRY an offset. Build list of GOT entries for global symbols 2084 along the way. */ 2085 2086static int 2087elf_m68k_finalize_got_offsets_1 (void **entry_ptr, void *_arg) 2088{ 2089 struct elf_m68k_got_entry *entry; 2090 struct elf_m68k_finalize_got_offsets_arg *arg; 2091 2092 enum elf_m68k_got_offset_size got_offset_size; 2093 bfd_vma entry_size; 2094 2095 entry = (struct elf_m68k_got_entry *) *entry_ptr; 2096 arg = (struct elf_m68k_finalize_got_offsets_arg *) _arg; 2097 2098 /* This should be a fresh entry created in elf_m68k_can_merge_gots. */ 2099 BFD_ASSERT (entry->u.s1.refcount == 0); 2100 2101 /* Get GOT offset size for the entry . */ 2102 got_offset_size = elf_m68k_reloc_got_offset_size (entry->key_.type); 2103 2104 /* Calculate entry size in bytes. */ 2105 entry_size = 4 * elf_m68k_reloc_got_n_slots (entry->key_.type); 2106 2107 /* Check if we should switch to negative range of the offsets. */ 2108 if (arg->offset1[got_offset_size] + entry_size 2109 > arg->offset2[got_offset_size]) 2110 { 2111 /* Verify that this is the only switch to negative range for 2112 got_offset_size. If this assertion fails, then we've miscalculated 2113 range for got_offset_size entries in 2114 elf_m68k_finalize_got_offsets. */ 2115 BFD_ASSERT (arg->offset2[got_offset_size] 2116 != arg->offset2[-(int) got_offset_size - 1]); 2117 2118 /* Switch. */ 2119 arg->offset1[got_offset_size] = arg->offset1[-(int) got_offset_size - 1]; 2120 arg->offset2[got_offset_size] = arg->offset2[-(int) got_offset_size - 1]; 2121 2122 /* Verify that now we have enough room for the entry. */ 2123 BFD_ASSERT (arg->offset1[got_offset_size] + entry_size 2124 <= arg->offset2[got_offset_size]); 2125 } 2126 2127 /* Assign offset to entry. */ 2128 entry->u.s2.offset = arg->offset1[got_offset_size]; 2129 arg->offset1[got_offset_size] += entry_size; 2130 2131 if (entry->key_.bfd == NULL) 2132 /* Hook up this entry into the list of got_entries of H. */ 2133 { 2134 struct elf_m68k_link_hash_entry *h; 2135 2136 h = arg->symndx2h[entry->key_.symndx]; 2137 if (h != NULL) 2138 { 2139 entry->u.s2.next = h->glist; 2140 h->glist = entry; 2141 } 2142 else 2143 /* This should be the entry for TLS_LDM relocation then. */ 2144 { 2145 BFD_ASSERT ((elf_m68k_reloc_got_type (entry->key_.type) 2146 == R_68K_TLS_LDM32) 2147 && entry->key_.symndx == 0); 2148 2149 ++arg->n_ldm_entries; 2150 } 2151 } 2152 else 2153 /* This entry is for local symbol. */ 2154 entry->u.s2.next = NULL; 2155 2156 return 1; 2157} 2158 2159/* Assign offsets within GOT. USE_NEG_GOT_OFFSETS_P indicates if we 2160 should use negative offsets. 2161 Build list of GOT entries for global symbols along the way. 2162 SYMNDX2H is mapping from global symbol indices to actual 2163 global symbols. 2164 Return offset at which next GOT should start. */ 2165 2166static void 2167elf_m68k_finalize_got_offsets (struct elf_m68k_got *got, 2168 bool use_neg_got_offsets_p, 2169 struct elf_m68k_link_hash_entry **symndx2h, 2170 bfd_vma *final_offset, bfd_vma *n_ldm_entries) 2171{ 2172 struct elf_m68k_finalize_got_offsets_arg arg_; 2173 bfd_vma offset1_[2 * R_LAST]; 2174 bfd_vma offset2_[2 * R_LAST]; 2175 int i; 2176 bfd_vma start_offset; 2177 2178 BFD_ASSERT (got->offset != (bfd_vma) -1); 2179 2180 /* We set entry offsets relative to the .got section (and not the 2181 start of a particular GOT), so that we can use them in 2182 finish_dynamic_symbol without needing to know the GOT which they come 2183 from. */ 2184 2185 /* Put offset1 in the middle of offset1_, same for offset2. */ 2186 arg_.offset1 = offset1_ + R_LAST; 2187 arg_.offset2 = offset2_ + R_LAST; 2188 2189 start_offset = got->offset; 2190 2191 if (use_neg_got_offsets_p) 2192 /* Setup both negative and positive ranges for R_8, R_16 and R_32. */ 2193 i = -(int) R_32 - 1; 2194 else 2195 /* Setup positives ranges for R_8, R_16 and R_32. */ 2196 i = (int) R_8; 2197 2198 for (; i <= (int) R_32; ++i) 2199 { 2200 int j; 2201 size_t n; 2202 2203 /* Set beginning of the range of offsets I. */ 2204 arg_.offset1[i] = start_offset; 2205 2206 /* Calculate number of slots that require I offsets. */ 2207 j = (i >= 0) ? i : -i - 1; 2208 n = (j >= 1) ? got->n_slots[j - 1] : 0; 2209 n = got->n_slots[j] - n; 2210 2211 if (use_neg_got_offsets_p && n != 0) 2212 { 2213 if (i < 0) 2214 /* We first fill the positive side of the range, so we might 2215 end up with one empty slot at that side when we can't fit 2216 whole 2-slot entry. Account for that at negative side of 2217 the interval with one additional entry. */ 2218 n = n / 2 + 1; 2219 else 2220 /* When the number of slots is odd, make positive side of the 2221 range one entry bigger. */ 2222 n = (n + 1) / 2; 2223 } 2224 2225 /* N is the number of slots that require I offsets. 2226 Calculate length of the range for I offsets. */ 2227 n = 4 * n; 2228 2229 /* Set end of the range. */ 2230 arg_.offset2[i] = start_offset + n; 2231 2232 start_offset = arg_.offset2[i]; 2233 } 2234 2235 if (!use_neg_got_offsets_p) 2236 /* Make sure that if we try to switch to negative offsets in 2237 elf_m68k_finalize_got_offsets_1, the assert therein will catch 2238 the bug. */ 2239 for (i = R_8; i <= R_32; ++i) 2240 arg_.offset2[-i - 1] = arg_.offset2[i]; 2241 2242 /* Setup got->offset. offset1[R_8] is either in the middle or at the 2243 beginning of GOT depending on use_neg_got_offsets_p. */ 2244 got->offset = arg_.offset1[R_8]; 2245 2246 arg_.symndx2h = symndx2h; 2247 arg_.n_ldm_entries = 0; 2248 2249 /* Assign offsets. */ 2250 htab_traverse (got->entries, elf_m68k_finalize_got_offsets_1, &arg_); 2251 2252 /* Check offset ranges we have actually assigned. */ 2253 for (i = (int) R_8; i <= (int) R_32; ++i) 2254 BFD_ASSERT (arg_.offset2[i] - arg_.offset1[i] <= 4); 2255 2256 *final_offset = start_offset; 2257 *n_ldm_entries = arg_.n_ldm_entries; 2258} 2259 2260struct elf_m68k_partition_multi_got_arg 2261{ 2262 /* The GOT we are adding entries to. Aka big got. */ 2263 struct elf_m68k_got *current_got; 2264 2265 /* Offset to assign the next CURRENT_GOT. */ 2266 bfd_vma offset; 2267 2268 /* Context where memory should be allocated. */ 2269 struct bfd_link_info *info; 2270 2271 /* Total number of slots in the .got section. 2272 This is used to calculate size of the .got and .rela.got sections. */ 2273 bfd_vma n_slots; 2274 2275 /* Difference in numbers of allocated slots in the .got section 2276 and necessary relocations in the .rela.got section. 2277 This is used to calculate size of the .rela.got section. */ 2278 bfd_vma slots_relas_diff; 2279 2280 /* Error flag. */ 2281 bool error_p; 2282 2283 /* Mapping from global symndx to global symbols. 2284 This is used to build lists of got entries for global symbols. */ 2285 struct elf_m68k_link_hash_entry **symndx2h; 2286}; 2287 2288static void 2289elf_m68k_partition_multi_got_2 (struct elf_m68k_partition_multi_got_arg *arg) 2290{ 2291 bfd_vma n_ldm_entries; 2292 2293 elf_m68k_finalize_got_offsets (arg->current_got, 2294 (elf_m68k_hash_table (arg->info) 2295 ->use_neg_got_offsets_p), 2296 arg->symndx2h, 2297 &arg->offset, &n_ldm_entries); 2298 2299 arg->n_slots += arg->current_got->n_slots[R_32]; 2300 2301 if (!bfd_link_pic (arg->info)) 2302 /* If we are generating a shared object, we need to 2303 output a R_68K_RELATIVE reloc so that the dynamic 2304 linker can adjust this GOT entry. Overwise we 2305 don't need space in .rela.got for local symbols. */ 2306 arg->slots_relas_diff += arg->current_got->local_n_slots; 2307 2308 /* @LDM relocations require a 2-slot GOT entry, but only 2309 one relocation. Account for that. */ 2310 arg->slots_relas_diff += n_ldm_entries; 2311 2312 BFD_ASSERT (arg->slots_relas_diff <= arg->n_slots); 2313} 2314 2315 2316/* Process a single BFD2GOT entry and either merge GOT to CURRENT_GOT 2317 or start a new CURRENT_GOT. */ 2318 2319static int 2320elf_m68k_partition_multi_got_1 (void **_entry, void *_arg) 2321{ 2322 struct elf_m68k_bfd2got_entry *entry; 2323 struct elf_m68k_partition_multi_got_arg *arg; 2324 struct elf_m68k_got *got; 2325 struct elf_m68k_got diff_; 2326 struct elf_m68k_got *diff; 2327 2328 entry = (struct elf_m68k_bfd2got_entry *) *_entry; 2329 arg = (struct elf_m68k_partition_multi_got_arg *) _arg; 2330 2331 got = entry->got; 2332 BFD_ASSERT (got != NULL); 2333 BFD_ASSERT (got->offset == (bfd_vma) -1); 2334 2335 diff = NULL; 2336 2337 if (arg->current_got != NULL) 2338 /* Construct diff. */ 2339 { 2340 diff = &diff_; 2341 elf_m68k_init_got (diff); 2342 2343 if (!elf_m68k_can_merge_gots (arg->current_got, got, arg->info, diff)) 2344 { 2345 if (diff->offset == 0) 2346 /* Offset set to 0 in the diff_ indicates an error. */ 2347 { 2348 arg->error_p = true; 2349 goto final_return; 2350 } 2351 2352 if (elf_m68k_hash_table (arg->info)->allow_multigot_p) 2353 { 2354 elf_m68k_clear_got (diff); 2355 /* Schedule to finish up current_got and start new one. */ 2356 diff = NULL; 2357 } 2358 /* else 2359 Merge GOTs no matter what. If big GOT overflows, 2360 we'll fail in relocate_section due to truncated relocations. 2361 2362 ??? May be fail earlier? E.g., in can_merge_gots. */ 2363 } 2364 } 2365 else 2366 /* Diff of got against empty current_got is got itself. */ 2367 { 2368 /* Create empty current_got to put subsequent GOTs to. */ 2369 arg->current_got = elf_m68k_create_empty_got (arg->info); 2370 if (arg->current_got == NULL) 2371 { 2372 arg->error_p = true; 2373 goto final_return; 2374 } 2375 2376 arg->current_got->offset = arg->offset; 2377 2378 diff = got; 2379 } 2380 2381 if (diff != NULL) 2382 { 2383 if (!elf_m68k_merge_gots (arg->current_got, diff, arg->info)) 2384 { 2385 arg->error_p = true; 2386 goto final_return; 2387 } 2388 2389 /* Now we can free GOT. */ 2390 elf_m68k_clear_got (got); 2391 2392 entry->got = arg->current_got; 2393 } 2394 else 2395 { 2396 /* Finish up current_got. */ 2397 elf_m68k_partition_multi_got_2 (arg); 2398 2399 /* Schedule to start a new current_got. */ 2400 arg->current_got = NULL; 2401 2402 /* Retry. */ 2403 if (!elf_m68k_partition_multi_got_1 (_entry, _arg)) 2404 { 2405 BFD_ASSERT (arg->error_p); 2406 goto final_return; 2407 } 2408 } 2409 2410 final_return: 2411 if (diff != NULL) 2412 elf_m68k_clear_got (diff); 2413 2414 return !arg->error_p; 2415} 2416 2417/* Helper function to build symndx2h mapping. */ 2418 2419static bool 2420elf_m68k_init_symndx2h_1 (struct elf_link_hash_entry *_h, 2421 void *_arg) 2422{ 2423 struct elf_m68k_link_hash_entry *h; 2424 2425 h = elf_m68k_hash_entry (_h); 2426 2427 if (h->got_entry_key != 0) 2428 /* H has at least one entry in the GOT. */ 2429 { 2430 struct elf_m68k_partition_multi_got_arg *arg; 2431 2432 arg = (struct elf_m68k_partition_multi_got_arg *) _arg; 2433 2434 BFD_ASSERT (arg->symndx2h[h->got_entry_key] == NULL); 2435 arg->symndx2h[h->got_entry_key] = h; 2436 } 2437 2438 return true; 2439} 2440 2441/* Merge GOTs of some BFDs, assign offsets to GOT entries and build 2442 lists of GOT entries for global symbols. 2443 Calculate sizes of .got and .rela.got sections. */ 2444 2445static bool 2446elf_m68k_partition_multi_got (struct bfd_link_info *info) 2447{ 2448 struct elf_m68k_multi_got *multi_got; 2449 struct elf_m68k_partition_multi_got_arg arg_; 2450 2451 multi_got = elf_m68k_multi_got (info); 2452 2453 arg_.current_got = NULL; 2454 arg_.offset = 0; 2455 arg_.info = info; 2456 arg_.n_slots = 0; 2457 arg_.slots_relas_diff = 0; 2458 arg_.error_p = false; 2459 2460 if (multi_got->bfd2got != NULL) 2461 { 2462 /* Initialize symndx2h mapping. */ 2463 { 2464 arg_.symndx2h = bfd_zmalloc (multi_got->global_symndx 2465 * sizeof (*arg_.symndx2h)); 2466 if (arg_.symndx2h == NULL) 2467 return false; 2468 2469 elf_link_hash_traverse (elf_hash_table (info), 2470 elf_m68k_init_symndx2h_1, &arg_); 2471 } 2472 2473 /* Partition. */ 2474 htab_traverse (multi_got->bfd2got, elf_m68k_partition_multi_got_1, 2475 &arg_); 2476 if (arg_.error_p) 2477 { 2478 free (arg_.symndx2h); 2479 arg_.symndx2h = NULL; 2480 2481 return false; 2482 } 2483 2484 /* Finish up last current_got. */ 2485 elf_m68k_partition_multi_got_2 (&arg_); 2486 2487 free (arg_.symndx2h); 2488 } 2489 2490 if (elf_hash_table (info)->dynobj != NULL) 2491 /* Set sizes of .got and .rela.got sections. */ 2492 { 2493 asection *s; 2494 2495 s = elf_hash_table (info)->sgot; 2496 if (s != NULL) 2497 s->size = arg_.offset; 2498 else 2499 BFD_ASSERT (arg_.offset == 0); 2500 2501 BFD_ASSERT (arg_.slots_relas_diff <= arg_.n_slots); 2502 arg_.n_slots -= arg_.slots_relas_diff; 2503 2504 s = elf_hash_table (info)->srelgot; 2505 if (s != NULL) 2506 s->size = arg_.n_slots * sizeof (Elf32_External_Rela); 2507 else 2508 BFD_ASSERT (arg_.n_slots == 0); 2509 } 2510 else 2511 BFD_ASSERT (multi_got->bfd2got == NULL); 2512 2513 return true; 2514} 2515 2516/* Copy any information related to dynamic linking from a pre-existing 2517 symbol to a newly created symbol. Also called to copy flags and 2518 other back-end info to a weakdef, in which case the symbol is not 2519 newly created and plt/got refcounts and dynamic indices should not 2520 be copied. */ 2521 2522static void 2523elf_m68k_copy_indirect_symbol (struct bfd_link_info *info, 2524 struct elf_link_hash_entry *_dir, 2525 struct elf_link_hash_entry *_ind) 2526{ 2527 struct elf_m68k_link_hash_entry *dir; 2528 struct elf_m68k_link_hash_entry *ind; 2529 2530 _bfd_elf_link_hash_copy_indirect (info, _dir, _ind); 2531 2532 if (_ind->root.type != bfd_link_hash_indirect) 2533 return; 2534 2535 dir = elf_m68k_hash_entry (_dir); 2536 ind = elf_m68k_hash_entry (_ind); 2537 2538 /* Any absolute non-dynamic relocations against an indirect or weak 2539 definition will be against the target symbol. */ 2540 _dir->non_got_ref |= _ind->non_got_ref; 2541 2542 /* We might have a direct symbol already having entries in the GOTs. 2543 Update its key only in case indirect symbol has GOT entries and 2544 assert that both indirect and direct symbols don't have GOT entries 2545 at the same time. */ 2546 if (ind->got_entry_key != 0) 2547 { 2548 BFD_ASSERT (dir->got_entry_key == 0); 2549 /* Assert that GOTs aren't partitioned yet. */ 2550 BFD_ASSERT (ind->glist == NULL); 2551 2552 dir->got_entry_key = ind->got_entry_key; 2553 ind->got_entry_key = 0; 2554 } 2555} 2556 2557/* Look through the relocs for a section during the first phase, and 2558 allocate space in the global offset table or procedure linkage 2559 table. */ 2560 2561static bool 2562elf_m68k_check_relocs (bfd *abfd, 2563 struct bfd_link_info *info, 2564 asection *sec, 2565 const Elf_Internal_Rela *relocs) 2566{ 2567 bfd *dynobj; 2568 Elf_Internal_Shdr *symtab_hdr; 2569 struct elf_link_hash_entry **sym_hashes; 2570 const Elf_Internal_Rela *rel; 2571 const Elf_Internal_Rela *rel_end; 2572 asection *sreloc; 2573 struct elf_m68k_got *got; 2574 2575 if (bfd_link_relocatable (info)) 2576 return true; 2577 2578 dynobj = elf_hash_table (info)->dynobj; 2579 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 2580 sym_hashes = elf_sym_hashes (abfd); 2581 2582 sreloc = NULL; 2583 2584 got = NULL; 2585 2586 rel_end = relocs + sec->reloc_count; 2587 for (rel = relocs; rel < rel_end; rel++) 2588 { 2589 unsigned long r_symndx; 2590 struct elf_link_hash_entry *h; 2591 2592 r_symndx = ELF32_R_SYM (rel->r_info); 2593 2594 if (r_symndx < symtab_hdr->sh_info) 2595 h = NULL; 2596 else 2597 { 2598 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 2599 while (h->root.type == bfd_link_hash_indirect 2600 || h->root.type == bfd_link_hash_warning) 2601 h = (struct elf_link_hash_entry *) h->root.u.i.link; 2602 } 2603 2604 switch (ELF32_R_TYPE (rel->r_info)) 2605 { 2606 case R_68K_GOT8: 2607 case R_68K_GOT16: 2608 case R_68K_GOT32: 2609 if (h != NULL 2610 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) 2611 break; 2612 /* Fall through. */ 2613 2614 /* Relative GOT relocations. */ 2615 case R_68K_GOT8O: 2616 case R_68K_GOT16O: 2617 case R_68K_GOT32O: 2618 /* Fall through. */ 2619 2620 /* TLS relocations. */ 2621 case R_68K_TLS_GD8: 2622 case R_68K_TLS_GD16: 2623 case R_68K_TLS_GD32: 2624 case R_68K_TLS_LDM8: 2625 case R_68K_TLS_LDM16: 2626 case R_68K_TLS_LDM32: 2627 case R_68K_TLS_IE8: 2628 case R_68K_TLS_IE16: 2629 case R_68K_TLS_IE32: 2630 2631 case R_68K_TLS_TPREL32: 2632 case R_68K_TLS_DTPREL32: 2633 2634 if (ELF32_R_TYPE (rel->r_info) == R_68K_TLS_TPREL32 2635 && bfd_link_pic (info)) 2636 /* Do the special chorus for libraries with static TLS. */ 2637 info->flags |= DF_STATIC_TLS; 2638 2639 /* This symbol requires a global offset table entry. */ 2640 2641 if (dynobj == NULL) 2642 { 2643 /* Create the .got section. */ 2644 elf_hash_table (info)->dynobj = dynobj = abfd; 2645 if (!_bfd_elf_create_got_section (dynobj, info)) 2646 return false; 2647 } 2648 2649 if (got == NULL) 2650 { 2651 struct elf_m68k_bfd2got_entry *bfd2got_entry; 2652 2653 bfd2got_entry 2654 = elf_m68k_get_bfd2got_entry (elf_m68k_multi_got (info), 2655 abfd, FIND_OR_CREATE, info); 2656 if (bfd2got_entry == NULL) 2657 return false; 2658 2659 got = bfd2got_entry->got; 2660 BFD_ASSERT (got != NULL); 2661 } 2662 2663 { 2664 struct elf_m68k_got_entry *got_entry; 2665 2666 /* Add entry to got. */ 2667 got_entry = elf_m68k_add_entry_to_got (got, h, abfd, 2668 ELF32_R_TYPE (rel->r_info), 2669 r_symndx, info); 2670 if (got_entry == NULL) 2671 return false; 2672 2673 if (got_entry->u.s1.refcount == 1) 2674 { 2675 /* Make sure this symbol is output as a dynamic symbol. */ 2676 if (h != NULL 2677 && h->dynindx == -1 2678 && !h->forced_local) 2679 { 2680 if (!bfd_elf_link_record_dynamic_symbol (info, h)) 2681 return false; 2682 } 2683 } 2684 } 2685 2686 break; 2687 2688 case R_68K_PLT8: 2689 case R_68K_PLT16: 2690 case R_68K_PLT32: 2691 /* This symbol requires a procedure linkage table entry. We 2692 actually build the entry in adjust_dynamic_symbol, 2693 because this might be a case of linking PIC code which is 2694 never referenced by a dynamic object, in which case we 2695 don't need to generate a procedure linkage table entry 2696 after all. */ 2697 2698 /* If this is a local symbol, we resolve it directly without 2699 creating a procedure linkage table entry. */ 2700 if (h == NULL) 2701 continue; 2702 2703 h->needs_plt = 1; 2704 h->plt.refcount++; 2705 break; 2706 2707 case R_68K_PLT8O: 2708 case R_68K_PLT16O: 2709 case R_68K_PLT32O: 2710 /* This symbol requires a procedure linkage table entry. */ 2711 2712 if (h == NULL) 2713 { 2714 /* It does not make sense to have this relocation for a 2715 local symbol. FIXME: does it? How to handle it if 2716 it does make sense? */ 2717 bfd_set_error (bfd_error_bad_value); 2718 return false; 2719 } 2720 2721 /* Make sure this symbol is output as a dynamic symbol. */ 2722 if (h->dynindx == -1 2723 && !h->forced_local) 2724 { 2725 if (!bfd_elf_link_record_dynamic_symbol (info, h)) 2726 return false; 2727 } 2728 2729 h->needs_plt = 1; 2730 h->plt.refcount++; 2731 break; 2732 2733 case R_68K_PC8: 2734 case R_68K_PC16: 2735 case R_68K_PC32: 2736 /* If we are creating a shared library and this is not a local 2737 symbol, we need to copy the reloc into the shared library. 2738 However when linking with -Bsymbolic and this is a global 2739 symbol which is defined in an object we are including in the 2740 link (i.e., DEF_REGULAR is set), then we can resolve the 2741 reloc directly. At this point we have not seen all the input 2742 files, so it is possible that DEF_REGULAR is not set now but 2743 will be set later (it is never cleared). We account for that 2744 possibility below by storing information in the 2745 pcrel_relocs_copied field of the hash table entry. */ 2746 if (!(bfd_link_pic (info) 2747 && (sec->flags & SEC_ALLOC) != 0 2748 && h != NULL 2749 && (!SYMBOLIC_BIND (info, h) 2750 || h->root.type == bfd_link_hash_defweak 2751 || !h->def_regular))) 2752 { 2753 if (h != NULL) 2754 { 2755 /* Make sure a plt entry is created for this symbol if 2756 it turns out to be a function defined by a dynamic 2757 object. */ 2758 h->plt.refcount++; 2759 } 2760 break; 2761 } 2762 /* Fall through. */ 2763 case R_68K_8: 2764 case R_68K_16: 2765 case R_68K_32: 2766 /* We don't need to handle relocs into sections not going into 2767 the "real" output. */ 2768 if ((sec->flags & SEC_ALLOC) == 0) 2769 break; 2770 2771 if (h != NULL) 2772 { 2773 /* Make sure a plt entry is created for this symbol if it 2774 turns out to be a function defined by a dynamic object. */ 2775 h->plt.refcount++; 2776 2777 if (bfd_link_executable (info)) 2778 /* This symbol needs a non-GOT reference. */ 2779 h->non_got_ref = 1; 2780 } 2781 2782 /* If we are creating a shared library, we need to copy the 2783 reloc into the shared library. */ 2784 if (bfd_link_pic (info) 2785 && (h == NULL 2786 || !UNDEFWEAK_NO_DYNAMIC_RELOC (info, h))) 2787 { 2788 /* When creating a shared object, we must copy these 2789 reloc types into the output file. We create a reloc 2790 section in dynobj and make room for this reloc. */ 2791 if (sreloc == NULL) 2792 { 2793 sreloc = _bfd_elf_make_dynamic_reloc_section 2794 (sec, dynobj, 2, abfd, /*rela?*/ true); 2795 2796 if (sreloc == NULL) 2797 return false; 2798 } 2799 2800 if (sec->flags & SEC_READONLY 2801 /* Don't set DF_TEXTREL yet for PC relative 2802 relocations, they might be discarded later. */ 2803 && !(ELF32_R_TYPE (rel->r_info) == R_68K_PC8 2804 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16 2805 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32)) 2806 { 2807 if (bfd_link_textrel_check(info)) 2808 (*_bfd_error_handler) 2809 (_("warning: dynamic relocation to `%s' in readonly section `%s'"), 2810 h->root.root.string, sec->name); 2811 info->flags |= DF_TEXTREL; 2812 } 2813 2814 sreloc->size += sizeof (Elf32_External_Rela); 2815 2816 /* We count the number of PC relative relocations we have 2817 entered for this symbol, so that we can discard them 2818 again if, in the -Bsymbolic case, the symbol is later 2819 defined by a regular object, or, in the normal shared 2820 case, the symbol is forced to be local. Note that this 2821 function is only called if we are using an m68kelf linker 2822 hash table, which means that h is really a pointer to an 2823 elf_m68k_link_hash_entry. */ 2824 if (ELF32_R_TYPE (rel->r_info) == R_68K_PC8 2825 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16 2826 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32) 2827 { 2828 struct elf_m68k_pcrel_relocs_copied *p; 2829 struct elf_m68k_pcrel_relocs_copied **head; 2830 2831 if (h != NULL) 2832 { 2833 struct elf_m68k_link_hash_entry *eh 2834 = elf_m68k_hash_entry (h); 2835 head = &eh->pcrel_relocs_copied; 2836 } 2837 else 2838 { 2839 asection *s; 2840 void *vpp; 2841 Elf_Internal_Sym *isym; 2842 2843 isym = bfd_sym_from_r_symndx (&elf_m68k_hash_table (info)->root.sym_cache, 2844 abfd, r_symndx); 2845 if (isym == NULL) 2846 return false; 2847 2848 s = bfd_section_from_elf_index (abfd, isym->st_shndx); 2849 if (s == NULL) 2850 s = sec; 2851 2852 vpp = &elf_section_data (s)->local_dynrel; 2853 head = (struct elf_m68k_pcrel_relocs_copied **) vpp; 2854 } 2855 2856 for (p = *head; p != NULL; p = p->next) 2857 if (p->section == sreloc) 2858 break; 2859 2860 if (p == NULL) 2861 { 2862 p = ((struct elf_m68k_pcrel_relocs_copied *) 2863 bfd_alloc (dynobj, (bfd_size_type) sizeof *p)); 2864 if (p == NULL) 2865 return false; 2866 p->next = *head; 2867 *head = p; 2868 p->section = sreloc; 2869 p->count = 0; 2870 } 2871 2872 ++p->count; 2873 } 2874 } 2875 2876 break; 2877 2878 /* This relocation describes the C++ object vtable hierarchy. 2879 Reconstruct it for later use during GC. */ 2880 case R_68K_GNU_VTINHERIT: 2881 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 2882 return false; 2883 break; 2884 2885 /* This relocation describes which C++ vtable entries are actually 2886 used. Record for later use during GC. */ 2887 case R_68K_GNU_VTENTRY: 2888 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 2889 return false; 2890 break; 2891 2892 default: 2893 break; 2894 } 2895 } 2896 2897 return true; 2898} 2899 2900/* Return the section that should be marked against GC for a given 2901 relocation. */ 2902 2903static asection * 2904elf_m68k_gc_mark_hook (asection *sec, 2905 struct bfd_link_info *info, 2906 Elf_Internal_Rela *rel, 2907 struct elf_link_hash_entry *h, 2908 Elf_Internal_Sym *sym) 2909{ 2910 if (h != NULL) 2911 switch (ELF32_R_TYPE (rel->r_info)) 2912 { 2913 case R_68K_GNU_VTINHERIT: 2914 case R_68K_GNU_VTENTRY: 2915 return NULL; 2916 } 2917 2918 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 2919} 2920 2921/* Return the type of PLT associated with OUTPUT_BFD. */ 2922 2923static const struct elf_m68k_plt_info * 2924elf_m68k_get_plt_info (bfd *output_bfd) 2925{ 2926 unsigned int features; 2927 2928 features = bfd_m68k_mach_to_features (bfd_get_mach (output_bfd)); 2929 if (features & cpu32) 2930 return &elf_cpu32_plt_info; 2931 if (features & mcfisa_b) 2932 return &elf_isab_plt_info; 2933 if (features & mcfisa_c) 2934 return &elf_isac_plt_info; 2935 return &elf_m68k_plt_info; 2936} 2937 2938/* This function is called after all the input files have been read, 2939 and the input sections have been assigned to output sections. 2940 It's a convenient place to determine the PLT style. */ 2941 2942static bool 2943elf_m68k_always_size_sections (bfd *output_bfd, struct bfd_link_info *info) 2944{ 2945 /* Bind input BFDs to GOTs and calculate sizes of .got and .rela.got 2946 sections. */ 2947 if (!elf_m68k_partition_multi_got (info)) 2948 return false; 2949 2950 elf_m68k_hash_table (info)->plt_info = elf_m68k_get_plt_info (output_bfd); 2951 return true; 2952} 2953 2954/* Adjust a symbol defined by a dynamic object and referenced by a 2955 regular object. The current definition is in some section of the 2956 dynamic object, but we're not including those sections. We have to 2957 change the definition to something the rest of the link can 2958 understand. */ 2959 2960static bool 2961elf_m68k_adjust_dynamic_symbol (struct bfd_link_info *info, 2962 struct elf_link_hash_entry *h) 2963{ 2964 struct elf_m68k_link_hash_table *htab; 2965 bfd *dynobj; 2966 asection *s; 2967 2968 htab = elf_m68k_hash_table (info); 2969 dynobj = htab->root.dynobj; 2970 2971 /* Make sure we know what is going on here. */ 2972 BFD_ASSERT (dynobj != NULL 2973 && (h->needs_plt 2974 || h->type == STT_GNU_IFUNC 2975 || h->is_weakalias 2976 || (h->def_dynamic 2977 && h->ref_regular 2978 && !h->def_regular))); 2979 2980 /* If this is a function, put it in the procedure linkage table. We 2981 will fill in the contents of the procedure linkage table later, 2982 when we know the address of the .got section. */ 2983 if ((h->type == STT_FUNC || h->type == STT_GNU_IFUNC) 2984 || h->needs_plt) 2985 { 2986 if ((h->plt.refcount <= 0 2987 || SYMBOL_CALLS_LOCAL (info, h) 2988 || ((ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 2989 || UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)) 2990 && h->root.type == bfd_link_hash_undefweak)) 2991 /* We must always create the plt entry if it was referenced 2992 by a PLTxxO relocation. In this case we already recorded 2993 it as a dynamic symbol. */ 2994 && h->dynindx == -1) 2995 { 2996 /* This case can occur if we saw a PLTxx reloc in an input 2997 file, but the symbol was never referred to by a dynamic 2998 object, or if all references were garbage collected. In 2999 such a case, we don't actually need to build a procedure 3000 linkage table, and we can just do a PCxx reloc instead. */ 3001 h->plt.offset = (bfd_vma) -1; 3002 h->needs_plt = 0; 3003 return true; 3004 } 3005 3006 /* Make sure this symbol is output as a dynamic symbol. */ 3007 if (h->dynindx == -1 3008 && !h->forced_local) 3009 { 3010 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 3011 return false; 3012 } 3013 3014 s = htab->root.splt; 3015 BFD_ASSERT (s != NULL); 3016 3017 /* If this is the first .plt entry, make room for the special 3018 first entry. */ 3019 if (s->size == 0) 3020 s->size = htab->plt_info->size; 3021 3022 /* If this symbol is not defined in a regular file, and we are 3023 not generating a shared library, then set the symbol to this 3024 location in the .plt. This is required to make function 3025 pointers compare as equal between the normal executable and 3026 the shared library. */ 3027 if (!bfd_link_pic (info) 3028 && !h->def_regular) 3029 { 3030 h->root.u.def.section = s; 3031 h->root.u.def.value = s->size; 3032 } 3033 3034 h->plt.offset = s->size; 3035 3036 /* Make room for this entry. */ 3037 s->size += htab->plt_info->size; 3038 3039 /* We also need to make an entry in the .got.plt section, which 3040 will be placed in the .got section by the linker script. */ 3041 s = htab->root.sgotplt; 3042 BFD_ASSERT (s != NULL); 3043 s->size += 4; 3044 3045 /* We also need to make an entry in the .rela.plt section. */ 3046 s = htab->root.srelplt; 3047 BFD_ASSERT (s != NULL); 3048 s->size += sizeof (Elf32_External_Rela); 3049 3050 return true; 3051 } 3052 3053 /* Reinitialize the plt offset now that it is not used as a reference 3054 count any more. */ 3055 h->plt.offset = (bfd_vma) -1; 3056 3057 /* If this is a weak symbol, and there is a real definition, the 3058 processor independent code will have arranged for us to see the 3059 real definition first, and we can just use the same value. */ 3060 if (h->is_weakalias) 3061 { 3062 struct elf_link_hash_entry *def = weakdef (h); 3063 BFD_ASSERT (def->root.type == bfd_link_hash_defined); 3064 h->root.u.def.section = def->root.u.def.section; 3065 h->root.u.def.value = def->root.u.def.value; 3066 return true; 3067 } 3068 3069 /* This is a reference to a symbol defined by a dynamic object which 3070 is not a function. */ 3071 3072 /* If we are creating a shared library, we must presume that the 3073 only references to the symbol are via the global offset table. 3074 For such cases we need not do anything here; the relocations will 3075 be handled correctly by relocate_section. */ 3076 if (bfd_link_pic (info)) 3077 return true; 3078 3079 /* If there are no references to this symbol that do not use the 3080 GOT, we don't need to generate a copy reloc. */ 3081 if (!h->non_got_ref) 3082 return true; 3083 3084 /* We must allocate the symbol in our .dynbss section, which will 3085 become part of the .bss section of the executable. There will be 3086 an entry for this symbol in the .dynsym section. The dynamic 3087 object will contain position independent code, so all references 3088 from the dynamic object to this symbol will go through the global 3089 offset table. The dynamic linker will use the .dynsym entry to 3090 determine the address it must put in the global offset table, so 3091 both the dynamic object and the regular object will refer to the 3092 same memory location for the variable. */ 3093 3094 s = bfd_get_linker_section (dynobj, ".dynbss"); 3095 BFD_ASSERT (s != NULL); 3096 3097 /* We must generate a R_68K_COPY reloc to tell the dynamic linker to 3098 copy the initial value out of the dynamic object and into the 3099 runtime process image. We need to remember the offset into the 3100 .rela.bss section we are going to use. */ 3101 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) 3102 { 3103 asection *srel; 3104 3105 srel = bfd_get_linker_section (dynobj, ".rela.bss"); 3106 BFD_ASSERT (srel != NULL); 3107 srel->size += sizeof (Elf32_External_Rela); 3108 h->needs_copy = 1; 3109 } 3110 3111 return _bfd_elf_adjust_dynamic_copy (info, h, s); 3112} 3113 3114/* Set the sizes of the dynamic sections. */ 3115 3116static bool 3117elf_m68k_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, 3118 struct bfd_link_info *info) 3119{ 3120 bfd *dynobj; 3121 asection *s; 3122 bool relocs; 3123 3124 dynobj = elf_hash_table (info)->dynobj; 3125 BFD_ASSERT (dynobj != NULL); 3126 3127 if (elf_hash_table (info)->dynamic_sections_created) 3128 { 3129 /* Set the contents of the .interp section to the interpreter. */ 3130 if (bfd_link_executable (info) && !info->nointerp) 3131 { 3132 s = bfd_get_linker_section (dynobj, ".interp"); 3133 BFD_ASSERT (s != NULL); 3134 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 3135 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 3136 } 3137 } 3138 else 3139 { 3140 /* We may have created entries in the .rela.got section. 3141 However, if we are not creating the dynamic sections, we will 3142 not actually use these entries. Reset the size of .rela.got, 3143 which will cause it to get stripped from the output file 3144 below. */ 3145 s = elf_hash_table (info)->srelgot; 3146 if (s != NULL) 3147 s->size = 0; 3148 } 3149 3150 /* If this is a -Bsymbolic shared link, then we need to discard all 3151 PC relative relocs against symbols defined in a regular object. 3152 For the normal shared case we discard the PC relative relocs 3153 against symbols that have become local due to visibility changes. 3154 We allocated space for them in the check_relocs routine, but we 3155 will not fill them in in the relocate_section routine. */ 3156 if (bfd_link_pic (info)) 3157 elf_link_hash_traverse (elf_hash_table (info), 3158 elf_m68k_discard_copies, 3159 info); 3160 3161 /* The check_relocs and adjust_dynamic_symbol entry points have 3162 determined the sizes of the various dynamic sections. Allocate 3163 memory for them. */ 3164 relocs = false; 3165 for (s = dynobj->sections; s != NULL; s = s->next) 3166 { 3167 const char *name; 3168 3169 if ((s->flags & SEC_LINKER_CREATED) == 0) 3170 continue; 3171 3172 /* It's OK to base decisions on the section name, because none 3173 of the dynobj section names depend upon the input files. */ 3174 name = bfd_section_name (s); 3175 3176 if (strcmp (name, ".plt") == 0) 3177 { 3178 /* Remember whether there is a PLT. */ 3179 ; 3180 } 3181 else if (startswith (name, ".rela")) 3182 { 3183 if (s->size != 0) 3184 { 3185 relocs = true; 3186 3187 /* We use the reloc_count field as a counter if we need 3188 to copy relocs into the output file. */ 3189 s->reloc_count = 0; 3190 } 3191 } 3192 else if (! startswith (name, ".got") 3193 && strcmp (name, ".dynbss") != 0) 3194 { 3195 /* It's not one of our sections, so don't allocate space. */ 3196 continue; 3197 } 3198 3199 if (s->size == 0) 3200 { 3201 /* If we don't need this section, strip it from the 3202 output file. This is mostly to handle .rela.bss and 3203 .rela.plt. We must create both sections in 3204 create_dynamic_sections, because they must be created 3205 before the linker maps input sections to output 3206 sections. The linker does that before 3207 adjust_dynamic_symbol is called, and it is that 3208 function which decides whether anything needs to go 3209 into these sections. */ 3210 s->flags |= SEC_EXCLUDE; 3211 continue; 3212 } 3213 3214 if ((s->flags & SEC_HAS_CONTENTS) == 0) 3215 continue; 3216 3217 /* Allocate memory for the section contents. */ 3218 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc. 3219 Unused entries should be reclaimed before the section's contents 3220 are written out, but at the moment this does not happen. Thus in 3221 order to prevent writing out garbage, we initialise the section's 3222 contents to zero. */ 3223 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); 3224 if (s->contents == NULL) 3225 return false; 3226 } 3227 3228 return _bfd_elf_add_dynamic_tags (output_bfd, info, relocs); 3229} 3230 3231/* This function is called via elf_link_hash_traverse if we are 3232 creating a shared object. In the -Bsymbolic case it discards the 3233 space allocated to copy PC relative relocs against symbols which 3234 are defined in regular objects. For the normal shared case, it 3235 discards space for pc-relative relocs that have become local due to 3236 symbol visibility changes. We allocated space for them in the 3237 check_relocs routine, but we won't fill them in in the 3238 relocate_section routine. 3239 3240 We also check whether any of the remaining relocations apply 3241 against a readonly section, and set the DF_TEXTREL flag in this 3242 case. */ 3243 3244static bool 3245elf_m68k_discard_copies (struct elf_link_hash_entry *h, 3246 void * inf) 3247{ 3248 struct bfd_link_info *info = (struct bfd_link_info *) inf; 3249 struct elf_m68k_pcrel_relocs_copied *s; 3250 3251 if (!SYMBOL_CALLS_LOCAL (info, h)) 3252 { 3253 if ((info->flags & DF_TEXTREL) == 0) 3254 { 3255 /* Look for relocations against read-only sections. */ 3256 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied; 3257 s != NULL; 3258 s = s->next) 3259 if ((s->section->flags & SEC_READONLY) != 0) 3260 { 3261 if (bfd_link_textrel_check(info)) 3262 (*_bfd_error_handler) 3263 (_("warning: dynamic relocation to `%s' in readonly section `%s'"), 3264 h->root.root.string, s->section->name); 3265 info->flags |= DF_TEXTREL; 3266 break; 3267 } 3268 } 3269 3270 /* Make sure undefined weak symbols are output as a dynamic symbol 3271 in PIEs. */ 3272 if (h->non_got_ref 3273 && h->root.type == bfd_link_hash_undefweak 3274 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 3275 && h->dynindx == -1 3276 && !h->forced_local) 3277 { 3278 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 3279 return false; 3280 } 3281 3282 return true; 3283 } 3284 3285 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied; 3286 s != NULL; 3287 s = s->next) 3288 s->section->size -= s->count * sizeof (Elf32_External_Rela); 3289 3290 return true; 3291} 3292 3293 3294/* Install relocation RELA. */ 3295 3296static void 3297elf_m68k_install_rela (bfd *output_bfd, 3298 asection *srela, 3299 Elf_Internal_Rela *rela) 3300{ 3301 bfd_byte *loc; 3302 3303 loc = srela->contents; 3304 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela); 3305 bfd_elf32_swap_reloca_out (output_bfd, rela, loc); 3306} 3307 3308/* Find the base offsets for thread-local storage in this object, 3309 for GD/LD and IE/LE respectively. */ 3310 3311#define DTP_OFFSET 0x8000 3312#define TP_OFFSET 0x7000 3313 3314static bfd_vma 3315dtpoff_base (struct bfd_link_info *info) 3316{ 3317 /* If tls_sec is NULL, we should have signalled an error already. */ 3318 if (elf_hash_table (info)->tls_sec == NULL) 3319 return 0; 3320 return elf_hash_table (info)->tls_sec->vma + DTP_OFFSET; 3321} 3322 3323static bfd_vma 3324tpoff_base (struct bfd_link_info *info) 3325{ 3326 /* If tls_sec is NULL, we should have signalled an error already. */ 3327 if (elf_hash_table (info)->tls_sec == NULL) 3328 return 0; 3329 return elf_hash_table (info)->tls_sec->vma + TP_OFFSET; 3330} 3331 3332/* Output necessary relocation to handle a symbol during static link. 3333 This function is called from elf_m68k_relocate_section. */ 3334 3335static void 3336elf_m68k_init_got_entry_static (struct bfd_link_info *info, 3337 bfd *output_bfd, 3338 enum elf_m68k_reloc_type r_type, 3339 asection *sgot, 3340 bfd_vma got_entry_offset, 3341 bfd_vma relocation) 3342{ 3343 switch (elf_m68k_reloc_got_type (r_type)) 3344 { 3345 case R_68K_GOT32O: 3346 bfd_put_32 (output_bfd, relocation, sgot->contents + got_entry_offset); 3347 break; 3348 3349 case R_68K_TLS_GD32: 3350 /* We know the offset within the module, 3351 put it into the second GOT slot. */ 3352 bfd_put_32 (output_bfd, relocation - dtpoff_base (info), 3353 sgot->contents + got_entry_offset + 4); 3354 /* FALLTHRU */ 3355 3356 case R_68K_TLS_LDM32: 3357 /* Mark it as belonging to module 1, the executable. */ 3358 bfd_put_32 (output_bfd, 1, sgot->contents + got_entry_offset); 3359 break; 3360 3361 case R_68K_TLS_IE32: 3362 bfd_put_32 (output_bfd, relocation - tpoff_base (info), 3363 sgot->contents + got_entry_offset); 3364 break; 3365 3366 default: 3367 BFD_ASSERT (false); 3368 } 3369} 3370 3371/* Output necessary relocation to handle a local symbol 3372 during dynamic link. 3373 This function is called either from elf_m68k_relocate_section 3374 or from elf_m68k_finish_dynamic_symbol. */ 3375 3376static void 3377elf_m68k_init_got_entry_local_shared (struct bfd_link_info *info, 3378 bfd *output_bfd, 3379 enum elf_m68k_reloc_type r_type, 3380 asection *sgot, 3381 bfd_vma got_entry_offset, 3382 bfd_vma relocation, 3383 asection *srela) 3384{ 3385 Elf_Internal_Rela outrel; 3386 3387 switch (elf_m68k_reloc_got_type (r_type)) 3388 { 3389 case R_68K_GOT32O: 3390 /* Emit RELATIVE relocation to initialize GOT slot 3391 at run-time. */ 3392 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE); 3393 outrel.r_addend = relocation; 3394 break; 3395 3396 case R_68K_TLS_GD32: 3397 /* We know the offset within the module, 3398 put it into the second GOT slot. */ 3399 bfd_put_32 (output_bfd, relocation - dtpoff_base (info), 3400 sgot->contents + got_entry_offset + 4); 3401 /* FALLTHRU */ 3402 3403 case R_68K_TLS_LDM32: 3404 /* We don't know the module number, 3405 create a relocation for it. */ 3406 outrel.r_info = ELF32_R_INFO (0, R_68K_TLS_DTPMOD32); 3407 outrel.r_addend = 0; 3408 break; 3409 3410 case R_68K_TLS_IE32: 3411 /* Emit TPREL relocation to initialize GOT slot 3412 at run-time. */ 3413 outrel.r_info = ELF32_R_INFO (0, R_68K_TLS_TPREL32); 3414 outrel.r_addend = relocation - elf_hash_table (info)->tls_sec->vma; 3415 break; 3416 3417 default: 3418 BFD_ASSERT (false); 3419 } 3420 3421 /* Offset of the GOT entry. */ 3422 outrel.r_offset = (sgot->output_section->vma 3423 + sgot->output_offset 3424 + got_entry_offset); 3425 3426 /* Install one of the above relocations. */ 3427 elf_m68k_install_rela (output_bfd, srela, &outrel); 3428 3429 bfd_put_32 (output_bfd, outrel.r_addend, sgot->contents + got_entry_offset); 3430} 3431 3432/* Relocate an M68K ELF section. */ 3433 3434static int 3435elf_m68k_relocate_section (bfd *output_bfd, 3436 struct bfd_link_info *info, 3437 bfd *input_bfd, 3438 asection *input_section, 3439 bfd_byte *contents, 3440 Elf_Internal_Rela *relocs, 3441 Elf_Internal_Sym *local_syms, 3442 asection **local_sections) 3443{ 3444 Elf_Internal_Shdr *symtab_hdr; 3445 struct elf_link_hash_entry **sym_hashes; 3446 asection *sgot; 3447 asection *splt; 3448 asection *sreloc; 3449 asection *srela; 3450 struct elf_m68k_got *got; 3451 Elf_Internal_Rela *rel; 3452 Elf_Internal_Rela *relend; 3453 3454 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 3455 sym_hashes = elf_sym_hashes (input_bfd); 3456 3457 sgot = NULL; 3458 splt = NULL; 3459 sreloc = NULL; 3460 srela = NULL; 3461 3462 got = NULL; 3463 3464 rel = relocs; 3465 relend = relocs + input_section->reloc_count; 3466 for (; rel < relend; rel++) 3467 { 3468 int r_type; 3469 reloc_howto_type *howto; 3470 unsigned long r_symndx; 3471 struct elf_link_hash_entry *h; 3472 Elf_Internal_Sym *sym; 3473 asection *sec; 3474 bfd_vma relocation; 3475 bool unresolved_reloc; 3476 bfd_reloc_status_type r; 3477 bool resolved_to_zero; 3478 3479 r_type = ELF32_R_TYPE (rel->r_info); 3480 if (r_type < 0 || r_type >= (int) R_68K_max) 3481 { 3482 bfd_set_error (bfd_error_bad_value); 3483 return false; 3484 } 3485 howto = howto_table + r_type; 3486 3487 r_symndx = ELF32_R_SYM (rel->r_info); 3488 3489 h = NULL; 3490 sym = NULL; 3491 sec = NULL; 3492 unresolved_reloc = false; 3493 3494 if (r_symndx < symtab_hdr->sh_info) 3495 { 3496 sym = local_syms + r_symndx; 3497 sec = local_sections[r_symndx]; 3498 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 3499 } 3500 else 3501 { 3502 bool warned, ignored; 3503 3504 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 3505 r_symndx, symtab_hdr, sym_hashes, 3506 h, sec, relocation, 3507 unresolved_reloc, warned, ignored); 3508 } 3509 3510 if (sec != NULL && discarded_section (sec)) 3511 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 3512 rel, 1, relend, howto, 0, contents); 3513 3514 if (bfd_link_relocatable (info)) 3515 continue; 3516 3517 resolved_to_zero = (h != NULL 3518 && UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)); 3519 3520 switch (r_type) 3521 { 3522 case R_68K_GOT8: 3523 case R_68K_GOT16: 3524 case R_68K_GOT32: 3525 /* Relocation is to the address of the entry for this symbol 3526 in the global offset table. */ 3527 if (h != NULL 3528 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) 3529 { 3530 if (elf_m68k_hash_table (info)->local_gp_p) 3531 { 3532 bfd_vma sgot_output_offset; 3533 bfd_vma got_offset; 3534 3535 sgot = elf_hash_table (info)->sgot; 3536 3537 if (sgot != NULL) 3538 sgot_output_offset = sgot->output_offset; 3539 else 3540 /* In this case we have a reference to 3541 _GLOBAL_OFFSET_TABLE_, but the GOT itself is 3542 empty. 3543 ??? Issue a warning? */ 3544 sgot_output_offset = 0; 3545 3546 if (got == NULL) 3547 { 3548 struct elf_m68k_bfd2got_entry *bfd2got_entry; 3549 3550 bfd2got_entry 3551 = elf_m68k_get_bfd2got_entry (elf_m68k_multi_got (info), 3552 input_bfd, SEARCH, NULL); 3553 3554 if (bfd2got_entry != NULL) 3555 { 3556 got = bfd2got_entry->got; 3557 BFD_ASSERT (got != NULL); 3558 3559 got_offset = got->offset; 3560 } 3561 else 3562 /* In this case we have a reference to 3563 _GLOBAL_OFFSET_TABLE_, but no other references 3564 accessing any GOT entries. 3565 ??? Issue a warning? */ 3566 got_offset = 0; 3567 } 3568 else 3569 got_offset = got->offset; 3570 3571 /* Adjust GOT pointer to point to the GOT 3572 assigned to input_bfd. */ 3573 rel->r_addend += sgot_output_offset + got_offset; 3574 } 3575 else 3576 BFD_ASSERT (got == NULL || got->offset == 0); 3577 3578 break; 3579 } 3580 /* Fall through. */ 3581 case R_68K_GOT8O: 3582 case R_68K_GOT16O: 3583 case R_68K_GOT32O: 3584 3585 case R_68K_TLS_LDM32: 3586 case R_68K_TLS_LDM16: 3587 case R_68K_TLS_LDM8: 3588 3589 case R_68K_TLS_GD8: 3590 case R_68K_TLS_GD16: 3591 case R_68K_TLS_GD32: 3592 3593 case R_68K_TLS_IE8: 3594 case R_68K_TLS_IE16: 3595 case R_68K_TLS_IE32: 3596 3597 /* Relocation is the offset of the entry for this symbol in 3598 the global offset table. */ 3599 3600 { 3601 struct elf_m68k_got_entry_key key_; 3602 bfd_vma *off_ptr; 3603 bfd_vma off; 3604 3605 sgot = elf_hash_table (info)->sgot; 3606 BFD_ASSERT (sgot != NULL); 3607 3608 if (got == NULL) 3609 got = elf_m68k_get_bfd2got_entry (elf_m68k_multi_got (info), 3610 input_bfd, MUST_FIND, 3611 NULL)->got; 3612 3613 /* Get GOT offset for this symbol. */ 3614 elf_m68k_init_got_entry_key (&key_, h, input_bfd, r_symndx, 3615 r_type); 3616 off_ptr = &elf_m68k_get_got_entry (got, &key_, MUST_FIND, 3617 NULL)->u.s2.offset; 3618 off = *off_ptr; 3619 3620 /* The offset must always be a multiple of 4. We use 3621 the least significant bit to record whether we have 3622 already generated the necessary reloc. */ 3623 if ((off & 1) != 0) 3624 off &= ~1; 3625 else 3626 { 3627 if (h != NULL 3628 /* @TLSLDM relocations are bounded to the module, in 3629 which the symbol is defined -- not to the symbol 3630 itself. */ 3631 && elf_m68k_reloc_got_type (r_type) != R_68K_TLS_LDM32) 3632 { 3633 bool dyn; 3634 3635 dyn = elf_hash_table (info)->dynamic_sections_created; 3636 if (!WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 3637 bfd_link_pic (info), 3638 h) 3639 || (bfd_link_pic (info) 3640 && SYMBOL_REFERENCES_LOCAL (info, h)) 3641 || ((ELF_ST_VISIBILITY (h->other) 3642 || resolved_to_zero) 3643 && h->root.type == bfd_link_hash_undefweak)) 3644 { 3645 /* This is actually a static link, or it is a 3646 -Bsymbolic link and the symbol is defined 3647 locally, or the symbol was forced to be local 3648 because of a version file. We must initialize 3649 this entry in the global offset table. Since 3650 the offset must always be a multiple of 4, we 3651 use the least significant bit to record whether 3652 we have initialized it already. 3653 3654 When doing a dynamic link, we create a .rela.got 3655 relocation entry to initialize the value. This 3656 is done in the finish_dynamic_symbol routine. */ 3657 3658 elf_m68k_init_got_entry_static (info, 3659 output_bfd, 3660 r_type, 3661 sgot, 3662 off, 3663 relocation); 3664 3665 *off_ptr |= 1; 3666 } 3667 else 3668 unresolved_reloc = false; 3669 } 3670 else if (bfd_link_pic (info)) /* && h == NULL */ 3671 /* Process local symbol during dynamic link. */ 3672 { 3673 srela = elf_hash_table (info)->srelgot; 3674 BFD_ASSERT (srela != NULL); 3675 3676 elf_m68k_init_got_entry_local_shared (info, 3677 output_bfd, 3678 r_type, 3679 sgot, 3680 off, 3681 relocation, 3682 srela); 3683 3684 *off_ptr |= 1; 3685 } 3686 else /* h == NULL && !bfd_link_pic (info) */ 3687 { 3688 elf_m68k_init_got_entry_static (info, 3689 output_bfd, 3690 r_type, 3691 sgot, 3692 off, 3693 relocation); 3694 3695 *off_ptr |= 1; 3696 } 3697 } 3698 3699 /* We don't use elf_m68k_reloc_got_type in the condition below 3700 because this is the only place where difference between 3701 R_68K_GOTx and R_68K_GOTxO relocations matters. */ 3702 if (r_type == R_68K_GOT32O 3703 || r_type == R_68K_GOT16O 3704 || r_type == R_68K_GOT8O 3705 || elf_m68k_reloc_got_type (r_type) == R_68K_TLS_GD32 3706 || elf_m68k_reloc_got_type (r_type) == R_68K_TLS_LDM32 3707 || elf_m68k_reloc_got_type (r_type) == R_68K_TLS_IE32) 3708 { 3709 /* GOT pointer is adjusted to point to the start/middle 3710 of local GOT. Adjust the offset accordingly. */ 3711 BFD_ASSERT (elf_m68k_hash_table (info)->use_neg_got_offsets_p 3712 || off >= got->offset); 3713 3714 if (elf_m68k_hash_table (info)->local_gp_p) 3715 relocation = off - got->offset; 3716 else 3717 { 3718 BFD_ASSERT (got->offset == 0); 3719 relocation = sgot->output_offset + off; 3720 } 3721 3722 /* This relocation does not use the addend. */ 3723 rel->r_addend = 0; 3724 } 3725 else 3726 relocation = (sgot->output_section->vma + sgot->output_offset 3727 + off); 3728 } 3729 break; 3730 3731 case R_68K_TLS_LDO32: 3732 case R_68K_TLS_LDO16: 3733 case R_68K_TLS_LDO8: 3734 relocation -= dtpoff_base (info); 3735 break; 3736 3737 case R_68K_TLS_LE32: 3738 case R_68K_TLS_LE16: 3739 case R_68K_TLS_LE8: 3740 if (bfd_link_dll (info)) 3741 { 3742 _bfd_error_handler 3743 /* xgettext:c-format */ 3744 (_("%pB(%pA+%#" PRIx64 "): " 3745 "%s relocation not permitted in shared object"), 3746 input_bfd, input_section, (uint64_t) rel->r_offset, 3747 howto->name); 3748 3749 return false; 3750 } 3751 else 3752 relocation -= tpoff_base (info); 3753 3754 break; 3755 3756 case R_68K_PLT8: 3757 case R_68K_PLT16: 3758 case R_68K_PLT32: 3759 /* Relocation is to the entry for this symbol in the 3760 procedure linkage table. */ 3761 3762 /* Resolve a PLTxx reloc against a local symbol directly, 3763 without using the procedure linkage table. */ 3764 if (h == NULL) 3765 break; 3766 3767 if (h->plt.offset == (bfd_vma) -1 3768 || !elf_hash_table (info)->dynamic_sections_created) 3769 { 3770 /* We didn't make a PLT entry for this symbol. This 3771 happens when statically linking PIC code, or when 3772 using -Bsymbolic. */ 3773 break; 3774 } 3775 3776 splt = elf_hash_table (info)->splt; 3777 BFD_ASSERT (splt != NULL); 3778 3779 relocation = (splt->output_section->vma 3780 + splt->output_offset 3781 + h->plt.offset); 3782 unresolved_reloc = false; 3783 break; 3784 3785 case R_68K_PLT8O: 3786 case R_68K_PLT16O: 3787 case R_68K_PLT32O: 3788 /* Relocation is the offset of the entry for this symbol in 3789 the procedure linkage table. */ 3790 BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1); 3791 3792 splt = elf_hash_table (info)->splt; 3793 BFD_ASSERT (splt != NULL); 3794 3795 relocation = h->plt.offset; 3796 unresolved_reloc = false; 3797 3798 /* This relocation does not use the addend. */ 3799 rel->r_addend = 0; 3800 3801 break; 3802 3803 case R_68K_8: 3804 case R_68K_16: 3805 case R_68K_32: 3806 case R_68K_PC8: 3807 case R_68K_PC16: 3808 case R_68K_PC32: 3809 if (bfd_link_pic (info) 3810 && r_symndx != STN_UNDEF 3811 && (input_section->flags & SEC_ALLOC) != 0 3812 && (h == NULL 3813 || (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 3814 && !resolved_to_zero) 3815 || h->root.type != bfd_link_hash_undefweak) 3816 && ((r_type != R_68K_PC8 3817 && r_type != R_68K_PC16 3818 && r_type != R_68K_PC32) 3819 || !SYMBOL_CALLS_LOCAL (info, h))) 3820 { 3821 Elf_Internal_Rela outrel; 3822 bfd_byte *loc; 3823 bool skip, relocate; 3824 3825 /* When generating a shared object, these relocations 3826 are copied into the output file to be resolved at run 3827 time. */ 3828 3829 skip = false; 3830 relocate = false; 3831 3832 outrel.r_offset = 3833 _bfd_elf_section_offset (output_bfd, info, input_section, 3834 rel->r_offset); 3835 if (outrel.r_offset == (bfd_vma) -1) 3836 skip = true; 3837 else if (outrel.r_offset == (bfd_vma) -2) 3838 skip = true, relocate = true; 3839 outrel.r_offset += (input_section->output_section->vma 3840 + input_section->output_offset); 3841 3842 if (skip) 3843 memset (&outrel, 0, sizeof outrel); 3844 else if (h != NULL 3845 && h->dynindx != -1 3846 && (r_type == R_68K_PC8 3847 || r_type == R_68K_PC16 3848 || r_type == R_68K_PC32 3849 || !bfd_link_pic (info) 3850 || !SYMBOLIC_BIND (info, h) 3851 || !h->def_regular)) 3852 { 3853 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 3854 outrel.r_addend = rel->r_addend; 3855 } 3856 else 3857 { 3858 /* This symbol is local, or marked to become local. */ 3859 outrel.r_addend = relocation + rel->r_addend; 3860 3861 if (r_type == R_68K_32) 3862 { 3863 relocate = true; 3864 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE); 3865 } 3866 else 3867 { 3868 long indx; 3869 3870 if (bfd_is_abs_section (sec)) 3871 indx = 0; 3872 else if (sec == NULL || sec->owner == NULL) 3873 { 3874 bfd_set_error (bfd_error_bad_value); 3875 return false; 3876 } 3877 else 3878 { 3879 asection *osec; 3880 3881 /* We are turning this relocation into one 3882 against a section symbol. It would be 3883 proper to subtract the symbol's value, 3884 osec->vma, from the emitted reloc addend, 3885 but ld.so expects buggy relocs. */ 3886 osec = sec->output_section; 3887 indx = elf_section_data (osec)->dynindx; 3888 if (indx == 0) 3889 { 3890 struct elf_link_hash_table *htab; 3891 htab = elf_hash_table (info); 3892 osec = htab->text_index_section; 3893 indx = elf_section_data (osec)->dynindx; 3894 } 3895 BFD_ASSERT (indx != 0); 3896 } 3897 3898 outrel.r_info = ELF32_R_INFO (indx, r_type); 3899 } 3900 } 3901 3902 sreloc = elf_section_data (input_section)->sreloc; 3903 if (sreloc == NULL) 3904 abort (); 3905 3906 loc = sreloc->contents; 3907 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); 3908 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 3909 3910 /* This reloc will be computed at runtime, so there's no 3911 need to do anything now, except for R_68K_32 3912 relocations that have been turned into 3913 R_68K_RELATIVE. */ 3914 if (!relocate) 3915 continue; 3916 } 3917 3918 break; 3919 3920 case R_68K_GNU_VTINHERIT: 3921 case R_68K_GNU_VTENTRY: 3922 /* These are no-ops in the end. */ 3923 continue; 3924 3925 default: 3926 break; 3927 } 3928 3929 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 3930 because such sections are not SEC_ALLOC and thus ld.so will 3931 not process them. */ 3932 if (unresolved_reloc 3933 && !((input_section->flags & SEC_DEBUGGING) != 0 3934 && h->def_dynamic) 3935 && _bfd_elf_section_offset (output_bfd, info, input_section, 3936 rel->r_offset) != (bfd_vma) -1) 3937 { 3938 _bfd_error_handler 3939 /* xgettext:c-format */ 3940 (_("%pB(%pA+%#" PRIx64 "): " 3941 "unresolvable %s relocation against symbol `%s'"), 3942 input_bfd, 3943 input_section, 3944 (uint64_t) rel->r_offset, 3945 howto->name, 3946 h->root.root.string); 3947 return false; 3948 } 3949 3950 if (r_symndx != STN_UNDEF 3951 && r_type != R_68K_NONE 3952 && (h == NULL 3953 || h->root.type == bfd_link_hash_defined 3954 || h->root.type == bfd_link_hash_defweak)) 3955 { 3956 char sym_type; 3957 3958 sym_type = (sym != NULL) ? ELF32_ST_TYPE (sym->st_info) : h->type; 3959 3960 if (elf_m68k_reloc_tls_p (r_type) != (sym_type == STT_TLS)) 3961 { 3962 const char *name; 3963 3964 if (h != NULL) 3965 name = h->root.root.string; 3966 else 3967 { 3968 name = (bfd_elf_string_from_elf_section 3969 (input_bfd, symtab_hdr->sh_link, sym->st_name)); 3970 if (name == NULL || *name == '\0') 3971 name = bfd_section_name (sec); 3972 } 3973 3974 _bfd_error_handler 3975 ((sym_type == STT_TLS 3976 /* xgettext:c-format */ 3977 ? _("%pB(%pA+%#" PRIx64 "): %s used with TLS symbol %s") 3978 /* xgettext:c-format */ 3979 : _("%pB(%pA+%#" PRIx64 "): %s used with non-TLS symbol %s")), 3980 input_bfd, 3981 input_section, 3982 (uint64_t) rel->r_offset, 3983 howto->name, 3984 name); 3985 } 3986 } 3987 3988 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 3989 contents, rel->r_offset, 3990 relocation, rel->r_addend); 3991 3992 if (r != bfd_reloc_ok) 3993 { 3994 const char *name; 3995 3996 if (h != NULL) 3997 name = h->root.root.string; 3998 else 3999 { 4000 name = bfd_elf_string_from_elf_section (input_bfd, 4001 symtab_hdr->sh_link, 4002 sym->st_name); 4003 if (name == NULL) 4004 return false; 4005 if (*name == '\0') 4006 name = bfd_section_name (sec); 4007 } 4008 4009 if (r == bfd_reloc_overflow) 4010 (*info->callbacks->reloc_overflow) 4011 (info, (h ? &h->root : NULL), name, howto->name, 4012 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 4013 else 4014 { 4015 _bfd_error_handler 4016 /* xgettext:c-format */ 4017 (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"), 4018 input_bfd, input_section, 4019 (uint64_t) rel->r_offset, name, (int) r); 4020 return false; 4021 } 4022 } 4023 } 4024 4025 return true; 4026} 4027 4028/* Install an M_68K_PC32 relocation against VALUE at offset OFFSET 4029 into section SEC. */ 4030 4031static void 4032elf_m68k_install_pc32 (asection *sec, bfd_vma offset, bfd_vma value) 4033{ 4034 /* Make VALUE PC-relative. */ 4035 value -= sec->output_section->vma + offset; 4036 4037 /* Apply any in-place addend. */ 4038 value += bfd_get_32 (sec->owner, sec->contents + offset); 4039 4040 bfd_put_32 (sec->owner, value, sec->contents + offset); 4041} 4042 4043/* Finish up dynamic symbol handling. We set the contents of various 4044 dynamic sections here. */ 4045 4046static bool 4047elf_m68k_finish_dynamic_symbol (bfd *output_bfd, 4048 struct bfd_link_info *info, 4049 struct elf_link_hash_entry *h, 4050 Elf_Internal_Sym *sym) 4051{ 4052 bfd *dynobj; 4053 4054 dynobj = elf_hash_table (info)->dynobj; 4055 4056 if (h->plt.offset != (bfd_vma) -1) 4057 { 4058 const struct elf_m68k_plt_info *plt_info; 4059 asection *splt; 4060 asection *sgot; 4061 asection *srela; 4062 bfd_vma plt_index; 4063 bfd_vma got_offset; 4064 Elf_Internal_Rela rela; 4065 bfd_byte *loc; 4066 4067 /* This symbol has an entry in the procedure linkage table. Set 4068 it up. */ 4069 4070 BFD_ASSERT (h->dynindx != -1); 4071 4072 plt_info = elf_m68k_hash_table (info)->plt_info; 4073 splt = elf_hash_table (info)->splt; 4074 sgot = elf_hash_table (info)->sgotplt; 4075 srela = elf_hash_table (info)->srelplt; 4076 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL); 4077 4078 /* Get the index in the procedure linkage table which 4079 corresponds to this symbol. This is the index of this symbol 4080 in all the symbols for which we are making plt entries. The 4081 first entry in the procedure linkage table is reserved. */ 4082 plt_index = (h->plt.offset / plt_info->size) - 1; 4083 4084 /* Get the offset into the .got table of the entry that 4085 corresponds to this function. Each .got entry is 4 bytes. 4086 The first three are reserved. */ 4087 got_offset = (plt_index + 3) * 4; 4088 4089 memcpy (splt->contents + h->plt.offset, 4090 plt_info->symbol_entry, 4091 plt_info->size); 4092 4093 elf_m68k_install_pc32 (splt, h->plt.offset + plt_info->symbol_relocs.got, 4094 (sgot->output_section->vma 4095 + sgot->output_offset 4096 + got_offset)); 4097 4098 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela), 4099 splt->contents 4100 + h->plt.offset 4101 + plt_info->symbol_resolve_entry + 2); 4102 4103 elf_m68k_install_pc32 (splt, h->plt.offset + plt_info->symbol_relocs.plt, 4104 splt->output_section->vma); 4105 4106 /* Fill in the entry in the global offset table. */ 4107 bfd_put_32 (output_bfd, 4108 (splt->output_section->vma 4109 + splt->output_offset 4110 + h->plt.offset 4111 + plt_info->symbol_resolve_entry), 4112 sgot->contents + got_offset); 4113 4114 /* Fill in the entry in the .rela.plt section. */ 4115 rela.r_offset = (sgot->output_section->vma 4116 + sgot->output_offset 4117 + got_offset); 4118 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT); 4119 rela.r_addend = 0; 4120 loc = srela->contents + plt_index * sizeof (Elf32_External_Rela); 4121 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 4122 4123 if (!h->def_regular) 4124 { 4125 /* Mark the symbol as undefined, rather than as defined in 4126 the .plt section. Leave the value alone. */ 4127 sym->st_shndx = SHN_UNDEF; 4128 } 4129 } 4130 4131 if (elf_m68k_hash_entry (h)->glist != NULL) 4132 { 4133 asection *sgot; 4134 asection *srela; 4135 struct elf_m68k_got_entry *got_entry; 4136 4137 /* This symbol has an entry in the global offset table. Set it 4138 up. */ 4139 4140 sgot = elf_hash_table (info)->sgot; 4141 srela = elf_hash_table (info)->srelgot; 4142 BFD_ASSERT (sgot != NULL && srela != NULL); 4143 4144 got_entry = elf_m68k_hash_entry (h)->glist; 4145 4146 while (got_entry != NULL) 4147 { 4148 enum elf_m68k_reloc_type r_type; 4149 bfd_vma got_entry_offset; 4150 4151 r_type = got_entry->key_.type; 4152 got_entry_offset = got_entry->u.s2.offset &~ (bfd_vma) 1; 4153 4154 /* If this is a -Bsymbolic link, and the symbol is defined 4155 locally, we just want to emit a RELATIVE reloc. Likewise if 4156 the symbol was forced to be local because of a version file. 4157 The entry in the global offset table already have been 4158 initialized in the relocate_section function. */ 4159 if (bfd_link_pic (info) 4160 && SYMBOL_REFERENCES_LOCAL (info, h)) 4161 { 4162 bfd_vma relocation; 4163 4164 relocation = bfd_get_signed_32 (output_bfd, 4165 (sgot->contents 4166 + got_entry_offset)); 4167 4168 /* Undo TP bias. */ 4169 switch (elf_m68k_reloc_got_type (r_type)) 4170 { 4171 case R_68K_GOT32O: 4172 case R_68K_TLS_LDM32: 4173 break; 4174 4175 case R_68K_TLS_GD32: 4176 /* The value for this relocation is actually put in 4177 the second GOT slot. */ 4178 relocation = bfd_get_signed_32 (output_bfd, 4179 (sgot->contents 4180 + got_entry_offset + 4)); 4181 relocation += dtpoff_base (info); 4182 break; 4183 4184 case R_68K_TLS_IE32: 4185 relocation += tpoff_base (info); 4186 break; 4187 4188 default: 4189 BFD_ASSERT (false); 4190 } 4191 4192 elf_m68k_init_got_entry_local_shared (info, 4193 output_bfd, 4194 r_type, 4195 sgot, 4196 got_entry_offset, 4197 relocation, 4198 srela); 4199 } 4200 else 4201 { 4202 Elf_Internal_Rela rela; 4203 4204 /* Put zeros to GOT slots that will be initialized 4205 at run-time. */ 4206 { 4207 bfd_vma n_slots; 4208 4209 n_slots = elf_m68k_reloc_got_n_slots (got_entry->key_.type); 4210 while (n_slots--) 4211 bfd_put_32 (output_bfd, (bfd_vma) 0, 4212 (sgot->contents + got_entry_offset 4213 + 4 * n_slots)); 4214 } 4215 4216 rela.r_addend = 0; 4217 rela.r_offset = (sgot->output_section->vma 4218 + sgot->output_offset 4219 + got_entry_offset); 4220 4221 switch (elf_m68k_reloc_got_type (r_type)) 4222 { 4223 case R_68K_GOT32O: 4224 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT); 4225 elf_m68k_install_rela (output_bfd, srela, &rela); 4226 break; 4227 4228 case R_68K_TLS_GD32: 4229 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_TLS_DTPMOD32); 4230 elf_m68k_install_rela (output_bfd, srela, &rela); 4231 4232 rela.r_offset += 4; 4233 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_TLS_DTPREL32); 4234 elf_m68k_install_rela (output_bfd, srela, &rela); 4235 break; 4236 4237 case R_68K_TLS_IE32: 4238 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_TLS_TPREL32); 4239 elf_m68k_install_rela (output_bfd, srela, &rela); 4240 break; 4241 4242 default: 4243 BFD_ASSERT (false); 4244 break; 4245 } 4246 } 4247 4248 got_entry = got_entry->u.s2.next; 4249 } 4250 } 4251 4252 if (h->needs_copy) 4253 { 4254 asection *s; 4255 Elf_Internal_Rela rela; 4256 bfd_byte *loc; 4257 4258 /* This symbol needs a copy reloc. Set it up. */ 4259 4260 BFD_ASSERT (h->dynindx != -1 4261 && (h->root.type == bfd_link_hash_defined 4262 || h->root.type == bfd_link_hash_defweak)); 4263 4264 s = bfd_get_linker_section (dynobj, ".rela.bss"); 4265 BFD_ASSERT (s != NULL); 4266 4267 rela.r_offset = (h->root.u.def.value 4268 + h->root.u.def.section->output_section->vma 4269 + h->root.u.def.section->output_offset); 4270 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY); 4271 rela.r_addend = 0; 4272 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela); 4273 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 4274 } 4275 4276 return true; 4277} 4278 4279/* Finish up the dynamic sections. */ 4280 4281static bool 4282elf_m68k_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) 4283{ 4284 bfd *dynobj; 4285 asection *sgot; 4286 asection *sdyn; 4287 4288 dynobj = elf_hash_table (info)->dynobj; 4289 4290 sgot = elf_hash_table (info)->sgotplt; 4291 BFD_ASSERT (sgot != NULL); 4292 sdyn = bfd_get_linker_section (dynobj, ".dynamic"); 4293 4294 if (elf_hash_table (info)->dynamic_sections_created) 4295 { 4296 asection *splt; 4297 Elf32_External_Dyn *dyncon, *dynconend; 4298 4299 splt = elf_hash_table (info)->splt; 4300 BFD_ASSERT (splt != NULL && sdyn != NULL); 4301 4302 dyncon = (Elf32_External_Dyn *) sdyn->contents; 4303 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 4304 for (; dyncon < dynconend; dyncon++) 4305 { 4306 Elf_Internal_Dyn dyn; 4307 asection *s; 4308 4309 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 4310 4311 switch (dyn.d_tag) 4312 { 4313 default: 4314 break; 4315 4316 case DT_PLTGOT: 4317 s = elf_hash_table (info)->sgotplt; 4318 goto get_vma; 4319 case DT_JMPREL: 4320 s = elf_hash_table (info)->srelplt; 4321 get_vma: 4322 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 4323 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 4324 break; 4325 4326 case DT_PLTRELSZ: 4327 s = elf_hash_table (info)->srelplt; 4328 dyn.d_un.d_val = s->size; 4329 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 4330 break; 4331 } 4332 } 4333 4334 /* Fill in the first entry in the procedure linkage table. */ 4335 if (splt->size > 0) 4336 { 4337 const struct elf_m68k_plt_info *plt_info; 4338 4339 plt_info = elf_m68k_hash_table (info)->plt_info; 4340 memcpy (splt->contents, plt_info->plt0_entry, plt_info->size); 4341 4342 elf_m68k_install_pc32 (splt, plt_info->plt0_relocs.got4, 4343 (sgot->output_section->vma 4344 + sgot->output_offset 4345 + 4)); 4346 4347 elf_m68k_install_pc32 (splt, plt_info->plt0_relocs.got8, 4348 (sgot->output_section->vma 4349 + sgot->output_offset 4350 + 8)); 4351 4352 elf_section_data (splt->output_section)->this_hdr.sh_entsize 4353 = plt_info->size; 4354 } 4355 } 4356 4357 /* Fill in the first three entries in the global offset table. */ 4358 if (sgot->size > 0) 4359 { 4360 if (sdyn == NULL) 4361 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); 4362 else 4363 bfd_put_32 (output_bfd, 4364 sdyn->output_section->vma + sdyn->output_offset, 4365 sgot->contents); 4366 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); 4367 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); 4368 } 4369 4370 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; 4371 4372 return true; 4373} 4374 4375/* Given a .data section and a .emreloc in-memory section, store 4376 relocation information into the .emreloc section which can be 4377 used at runtime to relocate the section. This is called by the 4378 linker when the --embedded-relocs switch is used. This is called 4379 after the add_symbols entry point has been called for all the 4380 objects, and before the final_link entry point is called. */ 4381 4382bool 4383bfd_m68k_elf32_create_embedded_relocs (bfd *abfd, struct bfd_link_info *info, 4384 asection *datasec, asection *relsec, 4385 char **errmsg) 4386{ 4387 Elf_Internal_Shdr *symtab_hdr; 4388 Elf_Internal_Sym *isymbuf = NULL; 4389 Elf_Internal_Rela *internal_relocs = NULL; 4390 Elf_Internal_Rela *irel, *irelend; 4391 bfd_byte *p; 4392 bfd_size_type amt; 4393 4394 BFD_ASSERT (! bfd_link_relocatable (info)); 4395 4396 *errmsg = NULL; 4397 4398 if (datasec->reloc_count == 0) 4399 return true; 4400 4401 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 4402 4403 /* Get a copy of the native relocations. */ 4404 internal_relocs = (_bfd_elf_link_read_relocs 4405 (abfd, datasec, NULL, (Elf_Internal_Rela *) NULL, 4406 info->keep_memory)); 4407 if (internal_relocs == NULL) 4408 goto error_return; 4409 4410 amt = (bfd_size_type) datasec->reloc_count * 12; 4411 relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt); 4412 if (relsec->contents == NULL) 4413 goto error_return; 4414 4415 p = relsec->contents; 4416 4417 irelend = internal_relocs + datasec->reloc_count; 4418 for (irel = internal_relocs; irel < irelend; irel++, p += 12) 4419 { 4420 asection *targetsec; 4421 4422 /* We are going to write a four byte longword into the runtime 4423 reloc section. The longword will be the address in the data 4424 section which must be relocated. It is followed by the name 4425 of the target section NUL-padded or truncated to 8 4426 characters. */ 4427 4428 /* We can only relocate absolute longword relocs at run time. */ 4429 if (ELF32_R_TYPE (irel->r_info) != (int) R_68K_32) 4430 { 4431 *errmsg = _("unsupported relocation type"); 4432 bfd_set_error (bfd_error_bad_value); 4433 goto error_return; 4434 } 4435 4436 /* Get the target section referred to by the reloc. */ 4437 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) 4438 { 4439 /* A local symbol. */ 4440 Elf_Internal_Sym *isym; 4441 4442 /* Read this BFD's local symbols if we haven't done so already. */ 4443 if (isymbuf == NULL) 4444 { 4445 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 4446 if (isymbuf == NULL) 4447 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, 4448 symtab_hdr->sh_info, 0, 4449 NULL, NULL, NULL); 4450 if (isymbuf == NULL) 4451 goto error_return; 4452 } 4453 4454 isym = isymbuf + ELF32_R_SYM (irel->r_info); 4455 targetsec = bfd_section_from_elf_index (abfd, isym->st_shndx); 4456 } 4457 else 4458 { 4459 unsigned long indx; 4460 struct elf_link_hash_entry *h; 4461 4462 /* An external symbol. */ 4463 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; 4464 h = elf_sym_hashes (abfd)[indx]; 4465 BFD_ASSERT (h != NULL); 4466 if (h->root.type == bfd_link_hash_defined 4467 || h->root.type == bfd_link_hash_defweak) 4468 targetsec = h->root.u.def.section; 4469 else 4470 targetsec = NULL; 4471 } 4472 4473 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p); 4474 memset (p + 4, 0, 8); 4475 if (targetsec != NULL) 4476 strncpy ((char *) p + 4, targetsec->output_section->name, 8); 4477 } 4478 4479 if (symtab_hdr->contents != (unsigned char *) isymbuf) 4480 free (isymbuf); 4481 if (elf_section_data (datasec)->relocs != internal_relocs) 4482 free (internal_relocs); 4483 return true; 4484 4485 error_return: 4486 if (symtab_hdr->contents != (unsigned char *) isymbuf) 4487 free (isymbuf); 4488 if (elf_section_data (datasec)->relocs != internal_relocs) 4489 free (internal_relocs); 4490 return false; 4491} 4492 4493/* Set target options. */ 4494 4495void 4496bfd_elf_m68k_set_target_options (struct bfd_link_info *info, int got_handling) 4497{ 4498 struct elf_m68k_link_hash_table *htab; 4499 bool use_neg_got_offsets_p; 4500 bool allow_multigot_p; 4501 bool local_gp_p; 4502 4503 switch (got_handling) 4504 { 4505 case 0: 4506 /* --got=single. */ 4507 local_gp_p = false; 4508 use_neg_got_offsets_p = false; 4509 allow_multigot_p = false; 4510 break; 4511 4512 case 1: 4513 /* --got=negative. */ 4514 local_gp_p = true; 4515 use_neg_got_offsets_p = true; 4516 allow_multigot_p = false; 4517 break; 4518 4519 case 2: 4520 /* --got=multigot. */ 4521 local_gp_p = true; 4522 use_neg_got_offsets_p = true; 4523 allow_multigot_p = true; 4524 break; 4525 4526 default: 4527 BFD_ASSERT (false); 4528 return; 4529 } 4530 4531 htab = elf_m68k_hash_table (info); 4532 if (htab != NULL) 4533 { 4534 htab->local_gp_p = local_gp_p; 4535 htab->use_neg_got_offsets_p = use_neg_got_offsets_p; 4536 htab->allow_multigot_p = allow_multigot_p; 4537 } 4538} 4539 4540static enum elf_reloc_type_class 4541elf32_m68k_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED, 4542 const asection *rel_sec ATTRIBUTE_UNUSED, 4543 const Elf_Internal_Rela *rela) 4544{ 4545 switch ((int) ELF32_R_TYPE (rela->r_info)) 4546 { 4547 case R_68K_RELATIVE: 4548 return reloc_class_relative; 4549 case R_68K_JMP_SLOT: 4550 return reloc_class_plt; 4551 case R_68K_COPY: 4552 return reloc_class_copy; 4553 default: 4554 return reloc_class_normal; 4555 } 4556} 4557 4558/* Return address for Ith PLT stub in section PLT, for relocation REL 4559 or (bfd_vma) -1 if it should not be included. */ 4560 4561static bfd_vma 4562elf_m68k_plt_sym_val (bfd_vma i, const asection *plt, 4563 const arelent *rel ATTRIBUTE_UNUSED) 4564{ 4565 return plt->vma + (i + 1) * elf_m68k_get_plt_info (plt->owner)->size; 4566} 4567 4568/* Support for core dump NOTE sections. */ 4569 4570static bool 4571elf_m68k_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) 4572{ 4573 int offset; 4574 size_t size; 4575 4576 switch (note->descsz) 4577 { 4578 default: 4579 return false; 4580 4581 case 154: /* Linux/m68k */ 4582 /* pr_cursig */ 4583 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12); 4584 4585 /* pr_pid */ 4586 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 22); 4587 4588 /* pr_reg */ 4589 offset = 70; 4590 size = 80; 4591 4592 break; 4593 } 4594 4595 /* Make a ".reg/999" section. */ 4596 return _bfd_elfcore_make_pseudosection (abfd, ".reg", 4597 size, note->descpos + offset); 4598} 4599 4600static bool 4601elf_m68k_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) 4602{ 4603 switch (note->descsz) 4604 { 4605 default: 4606 return false; 4607 4608 case 124: /* Linux/m68k elf_prpsinfo. */ 4609 elf_tdata (abfd)->core->pid 4610 = bfd_get_32 (abfd, note->descdata + 12); 4611 elf_tdata (abfd)->core->program 4612 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); 4613 elf_tdata (abfd)->core->command 4614 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); 4615 } 4616 4617 /* Note that for some reason, a spurious space is tacked 4618 onto the end of the args in some (at least one anyway) 4619 implementations, so strip it off if it exists. */ 4620 { 4621 char *command = elf_tdata (abfd)->core->command; 4622 int n = strlen (command); 4623 4624 if (n > 0 && command[n - 1] == ' ') 4625 command[n - 1] = '\0'; 4626 } 4627 4628 return true; 4629} 4630 4631#define TARGET_BIG_SYM m68k_elf32_vec 4632#define TARGET_BIG_NAME "elf32-m68k" 4633#define ELF_MACHINE_CODE EM_68K 4634#define ELF_MAXPAGESIZE 0x2000 4635#define elf_backend_create_dynamic_sections \ 4636 _bfd_elf_create_dynamic_sections 4637#define bfd_elf32_bfd_link_hash_table_create \ 4638 elf_m68k_link_hash_table_create 4639#define bfd_elf32_bfd_final_link bfd_elf_final_link 4640 4641#define elf_backend_check_relocs elf_m68k_check_relocs 4642#define elf_backend_always_size_sections \ 4643 elf_m68k_always_size_sections 4644#define elf_backend_adjust_dynamic_symbol \ 4645 elf_m68k_adjust_dynamic_symbol 4646#define elf_backend_size_dynamic_sections \ 4647 elf_m68k_size_dynamic_sections 4648#define elf_backend_final_write_processing elf_m68k_final_write_processing 4649#define elf_backend_init_index_section _bfd_elf_init_1_index_section 4650#define elf_backend_relocate_section elf_m68k_relocate_section 4651#define elf_backend_finish_dynamic_symbol \ 4652 elf_m68k_finish_dynamic_symbol 4653#define elf_backend_finish_dynamic_sections \ 4654 elf_m68k_finish_dynamic_sections 4655#define elf_backend_gc_mark_hook elf_m68k_gc_mark_hook 4656#define elf_backend_copy_indirect_symbol elf_m68k_copy_indirect_symbol 4657#define bfd_elf32_bfd_merge_private_bfd_data \ 4658 elf32_m68k_merge_private_bfd_data 4659#define bfd_elf32_bfd_set_private_flags \ 4660 elf32_m68k_set_private_flags 4661#define bfd_elf32_bfd_print_private_bfd_data \ 4662 elf32_m68k_print_private_bfd_data 4663#define elf_backend_reloc_type_class elf32_m68k_reloc_type_class 4664#define elf_backend_plt_sym_val elf_m68k_plt_sym_val 4665#define elf_backend_object_p elf32_m68k_object_p 4666#define elf_backend_grok_prstatus elf_m68k_grok_prstatus 4667#define elf_backend_grok_psinfo elf_m68k_grok_psinfo 4668 4669#define elf_backend_can_gc_sections 1 4670#define elf_backend_can_refcount 1 4671#define elf_backend_want_got_plt 1 4672#define elf_backend_plt_readonly 1 4673#define elf_backend_want_plt_sym 0 4674#define elf_backend_got_header_size 12 4675#define elf_backend_rela_normal 1 4676#define elf_backend_dtrel_excludes_plt 1 4677 4678#define elf_backend_linux_prpsinfo32_ugid16 true 4679 4680#include "elf32-target.h" 4681