| 1 | /* Motorola 68k series support for 32-bit ELF |
| 2 | Copyright 1993, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, |
| 3 | 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 |
| 4 | Free Software Foundation, Inc. |
| 5 | |
| 6 | This file is part of BFD, the Binary File Descriptor library. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 21 | MA 02110-1301, USA. */ |
| 22 | |
| 23 | #include "sysdep.h" |
| 24 | #include "bfd.h" |
| 25 | #include "bfdlink.h" |
| 26 | #include "libbfd.h" |
| 27 | #include "elf-bfd.h" |
| 28 | #include "elf/m68k.h" |
| 29 | #include "opcode/m68k.h" |
| 30 | |
| 31 | static bfd_boolean |
| 32 | elf_m68k_discard_copies (struct elf_link_hash_entry *, void *); |
| 33 | |
| 34 | static reloc_howto_type howto_table[] = |
| 35 | { |
| 36 | HOWTO(R_68K_NONE, 0, 0, 0, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_NONE", FALSE, 0, 0x00000000,FALSE), |
| 37 | HOWTO(R_68K_32, 0, 2,32, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_32", FALSE, 0, 0xffffffff,FALSE), |
| 38 | HOWTO(R_68K_16, 0, 1,16, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_16", FALSE, 0, 0x0000ffff,FALSE), |
| 39 | HOWTO(R_68K_8, 0, 0, 8, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_8", FALSE, 0, 0x000000ff,FALSE), |
| 40 | HOWTO(R_68K_PC32, 0, 2,32, TRUE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PC32", FALSE, 0, 0xffffffff,TRUE), |
| 41 | HOWTO(R_68K_PC16, 0, 1,16, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC16", FALSE, 0, 0x0000ffff,TRUE), |
| 42 | HOWTO(R_68K_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC8", FALSE, 0, 0x000000ff,TRUE), |
| 43 | HOWTO(R_68K_GOT32, 0, 2,32, TRUE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32", FALSE, 0, 0xffffffff,TRUE), |
| 44 | HOWTO(R_68K_GOT16, 0, 1,16, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16", FALSE, 0, 0x0000ffff,TRUE), |
| 45 | HOWTO(R_68K_GOT8, 0, 0, 8, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8", FALSE, 0, 0x000000ff,TRUE), |
| 46 | HOWTO(R_68K_GOT32O, 0, 2,32, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32O", FALSE, 0, 0xffffffff,FALSE), |
| 47 | HOWTO(R_68K_GOT16O, 0, 1,16, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16O", FALSE, 0, 0x0000ffff,FALSE), |
| 48 | HOWTO(R_68K_GOT8O, 0, 0, 8, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8O", FALSE, 0, 0x000000ff,FALSE), |
| 49 | HOWTO(R_68K_PLT32, 0, 2,32, TRUE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32", FALSE, 0, 0xffffffff,TRUE), |
| 50 | HOWTO(R_68K_PLT16, 0, 1,16, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16", FALSE, 0, 0x0000ffff,TRUE), |
| 51 | HOWTO(R_68K_PLT8, 0, 0, 8, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8", FALSE, 0, 0x000000ff,TRUE), |
| 52 | HOWTO(R_68K_PLT32O, 0, 2,32, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32O", FALSE, 0, 0xffffffff,FALSE), |
| 53 | HOWTO(R_68K_PLT16O, 0, 1,16, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16O", FALSE, 0, 0x0000ffff,FALSE), |
| 54 | HOWTO(R_68K_PLT8O, 0, 0, 8, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8O", FALSE, 0, 0x000000ff,FALSE), |
| 55 | HOWTO(R_68K_COPY, 0, 0, 0, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_COPY", FALSE, 0, 0xffffffff,FALSE), |
| 56 | HOWTO(R_68K_GLOB_DAT, 0, 2,32, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_GLOB_DAT", FALSE, 0, 0xffffffff,FALSE), |
| 57 | HOWTO(R_68K_JMP_SLOT, 0, 2,32, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_JMP_SLOT", FALSE, 0, 0xffffffff,FALSE), |
| 58 | HOWTO(R_68K_RELATIVE, 0, 2,32, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_RELATIVE", FALSE, 0, 0xffffffff,FALSE), |
| 59 | /* GNU extension to record C++ vtable hierarchy. */ |
| 60 | HOWTO (R_68K_GNU_VTINHERIT, /* type */ |
| 61 | 0, /* rightshift */ |
| 62 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 63 | 0, /* bitsize */ |
| 64 | FALSE, /* pc_relative */ |
| 65 | 0, /* bitpos */ |
| 66 | complain_overflow_dont, /* complain_on_overflow */ |
| 67 | NULL, /* special_function */ |
| 68 | "R_68K_GNU_VTINHERIT", /* name */ |
| 69 | FALSE, /* partial_inplace */ |
| 70 | 0, /* src_mask */ |
| 71 | 0, /* dst_mask */ |
| 72 | FALSE), |
| 73 | /* GNU extension to record C++ vtable member usage. */ |
| 74 | HOWTO (R_68K_GNU_VTENTRY, /* type */ |
| 75 | 0, /* rightshift */ |
| 76 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 77 | 0, /* bitsize */ |
| 78 | FALSE, /* pc_relative */ |
| 79 | 0, /* bitpos */ |
| 80 | complain_overflow_dont, /* complain_on_overflow */ |
| 81 | _bfd_elf_rel_vtable_reloc_fn, /* special_function */ |
| 82 | "R_68K_GNU_VTENTRY", /* name */ |
| 83 | FALSE, /* partial_inplace */ |
| 84 | 0, /* src_mask */ |
| 85 | 0, /* dst_mask */ |
| 86 | FALSE), |
| 87 | |
| 88 | /* TLS general dynamic variable reference. */ |
| 89 | HOWTO (R_68K_TLS_GD32, /* type */ |
| 90 | 0, /* rightshift */ |
| 91 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 92 | 32, /* bitsize */ |
| 93 | FALSE, /* pc_relative */ |
| 94 | 0, /* bitpos */ |
| 95 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 96 | bfd_elf_generic_reloc, /* special_function */ |
| 97 | "R_68K_TLS_GD32", /* name */ |
| 98 | FALSE, /* partial_inplace */ |
| 99 | 0, /* src_mask */ |
| 100 | 0xffffffff, /* dst_mask */ |
| 101 | FALSE), /* pcrel_offset */ |
| 102 | |
| 103 | HOWTO (R_68K_TLS_GD16, /* type */ |
| 104 | 0, /* rightshift */ |
| 105 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 106 | 16, /* bitsize */ |
| 107 | FALSE, /* pc_relative */ |
| 108 | 0, /* bitpos */ |
| 109 | complain_overflow_signed, /* complain_on_overflow */ |
| 110 | bfd_elf_generic_reloc, /* special_function */ |
| 111 | "R_68K_TLS_GD16", /* name */ |
| 112 | FALSE, /* partial_inplace */ |
| 113 | 0, /* src_mask */ |
| 114 | 0x0000ffff, /* dst_mask */ |
| 115 | FALSE), /* pcrel_offset */ |
| 116 | |
| 117 | HOWTO (R_68K_TLS_GD8, /* type */ |
| 118 | 0, /* rightshift */ |
| 119 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 120 | 8, /* bitsize */ |
| 121 | FALSE, /* pc_relative */ |
| 122 | 0, /* bitpos */ |
| 123 | complain_overflow_signed, /* complain_on_overflow */ |
| 124 | bfd_elf_generic_reloc, /* special_function */ |
| 125 | "R_68K_TLS_GD8", /* name */ |
| 126 | FALSE, /* partial_inplace */ |
| 127 | 0, /* src_mask */ |
| 128 | 0x000000ff, /* dst_mask */ |
| 129 | FALSE), /* pcrel_offset */ |
| 130 | |
| 131 | /* TLS local dynamic variable reference. */ |
| 132 | HOWTO (R_68K_TLS_LDM32, /* type */ |
| 133 | 0, /* rightshift */ |
| 134 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 135 | 32, /* bitsize */ |
| 136 | FALSE, /* pc_relative */ |
| 137 | 0, /* bitpos */ |
| 138 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 139 | bfd_elf_generic_reloc, /* special_function */ |
| 140 | "R_68K_TLS_LDM32", /* name */ |
| 141 | FALSE, /* partial_inplace */ |
| 142 | 0, /* src_mask */ |
| 143 | 0xffffffff, /* dst_mask */ |
| 144 | FALSE), /* pcrel_offset */ |
| 145 | |
| 146 | HOWTO (R_68K_TLS_LDM16, /* type */ |
| 147 | 0, /* rightshift */ |
| 148 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 149 | 16, /* bitsize */ |
| 150 | FALSE, /* pc_relative */ |
| 151 | 0, /* bitpos */ |
| 152 | complain_overflow_signed, /* complain_on_overflow */ |
| 153 | bfd_elf_generic_reloc, /* special_function */ |
| 154 | "R_68K_TLS_LDM16", /* name */ |
| 155 | FALSE, /* partial_inplace */ |
| 156 | 0, /* src_mask */ |
| 157 | 0x0000ffff, /* dst_mask */ |
| 158 | FALSE), /* pcrel_offset */ |
| 159 | |
| 160 | HOWTO (R_68K_TLS_LDM8, /* type */ |
| 161 | 0, /* rightshift */ |
| 162 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 163 | 8, /* bitsize */ |
| 164 | FALSE, /* pc_relative */ |
| 165 | 0, /* bitpos */ |
| 166 | complain_overflow_signed, /* complain_on_overflow */ |
| 167 | bfd_elf_generic_reloc, /* special_function */ |
| 168 | "R_68K_TLS_LDM8", /* name */ |
| 169 | FALSE, /* partial_inplace */ |
| 170 | 0, /* src_mask */ |
| 171 | 0x000000ff, /* dst_mask */ |
| 172 | FALSE), /* pcrel_offset */ |
| 173 | |
| 174 | HOWTO (R_68K_TLS_LDO32, /* type */ |
| 175 | 0, /* rightshift */ |
| 176 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 177 | 32, /* bitsize */ |
| 178 | FALSE, /* pc_relative */ |
| 179 | 0, /* bitpos */ |
| 180 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 181 | bfd_elf_generic_reloc, /* special_function */ |
| 182 | "R_68K_TLS_LDO32", /* name */ |
| 183 | FALSE, /* partial_inplace */ |
| 184 | 0, /* src_mask */ |
| 185 | 0xffffffff, /* dst_mask */ |
| 186 | FALSE), /* pcrel_offset */ |
| 187 | |
| 188 | HOWTO (R_68K_TLS_LDO16, /* type */ |
| 189 | 0, /* rightshift */ |
| 190 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 191 | 16, /* bitsize */ |
| 192 | FALSE, /* pc_relative */ |
| 193 | 0, /* bitpos */ |
| 194 | complain_overflow_signed, /* complain_on_overflow */ |
| 195 | bfd_elf_generic_reloc, /* special_function */ |
| 196 | "R_68K_TLS_LDO16", /* name */ |
| 197 | FALSE, /* partial_inplace */ |
| 198 | 0, /* src_mask */ |
| 199 | 0x0000ffff, /* dst_mask */ |
| 200 | FALSE), /* pcrel_offset */ |
| 201 | |
| 202 | HOWTO (R_68K_TLS_LDO8, /* type */ |
| 203 | 0, /* rightshift */ |
| 204 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 205 | 8, /* bitsize */ |
| 206 | FALSE, /* pc_relative */ |
| 207 | 0, /* bitpos */ |
| 208 | complain_overflow_signed, /* complain_on_overflow */ |
| 209 | bfd_elf_generic_reloc, /* special_function */ |
| 210 | "R_68K_TLS_LDO8", /* name */ |
| 211 | FALSE, /* partial_inplace */ |
| 212 | 0, /* src_mask */ |
| 213 | 0x000000ff, /* dst_mask */ |
| 214 | FALSE), /* pcrel_offset */ |
| 215 | |
| 216 | /* TLS initial execution variable reference. */ |
| 217 | HOWTO (R_68K_TLS_IE32, /* type */ |
| 218 | 0, /* rightshift */ |
| 219 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 220 | 32, /* bitsize */ |
| 221 | FALSE, /* pc_relative */ |
| 222 | 0, /* bitpos */ |
| 223 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 224 | bfd_elf_generic_reloc, /* special_function */ |
| 225 | "R_68K_TLS_IE32", /* name */ |
| 226 | FALSE, /* partial_inplace */ |
| 227 | 0, /* src_mask */ |
| 228 | 0xffffffff, /* dst_mask */ |
| 229 | FALSE), /* pcrel_offset */ |
| 230 | |
| 231 | HOWTO (R_68K_TLS_IE16, /* type */ |
| 232 | 0, /* rightshift */ |
| 233 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 234 | 16, /* bitsize */ |
| 235 | FALSE, /* pc_relative */ |
| 236 | 0, /* bitpos */ |
| 237 | complain_overflow_signed, /* complain_on_overflow */ |
| 238 | bfd_elf_generic_reloc, /* special_function */ |
| 239 | "R_68K_TLS_IE16", /* name */ |
| 240 | FALSE, /* partial_inplace */ |
| 241 | 0, /* src_mask */ |
| 242 | 0x0000ffff, /* dst_mask */ |
| 243 | FALSE), /* pcrel_offset */ |
| 244 | |
| 245 | HOWTO (R_68K_TLS_IE8, /* type */ |
| 246 | 0, /* rightshift */ |
| 247 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 248 | 8, /* bitsize */ |
| 249 | FALSE, /* pc_relative */ |
| 250 | 0, /* bitpos */ |
| 251 | complain_overflow_signed, /* complain_on_overflow */ |
| 252 | bfd_elf_generic_reloc, /* special_function */ |
| 253 | "R_68K_TLS_IE8", /* name */ |
| 254 | FALSE, /* partial_inplace */ |
| 255 | 0, /* src_mask */ |
| 256 | 0x000000ff, /* dst_mask */ |
| 257 | FALSE), /* pcrel_offset */ |
| 258 | |
| 259 | /* TLS local execution variable reference. */ |
| 260 | HOWTO (R_68K_TLS_LE32, /* type */ |
| 261 | 0, /* rightshift */ |
| 262 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 263 | 32, /* bitsize */ |
| 264 | FALSE, /* pc_relative */ |
| 265 | 0, /* bitpos */ |
| 266 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 267 | bfd_elf_generic_reloc, /* special_function */ |
| 268 | "R_68K_TLS_LE32", /* name */ |
| 269 | FALSE, /* partial_inplace */ |
| 270 | 0, /* src_mask */ |
| 271 | 0xffffffff, /* dst_mask */ |
| 272 | FALSE), /* pcrel_offset */ |
| 273 | |
| 274 | HOWTO (R_68K_TLS_LE16, /* type */ |
| 275 | 0, /* rightshift */ |
| 276 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 277 | 16, /* bitsize */ |
| 278 | FALSE, /* pc_relative */ |
| 279 | 0, /* bitpos */ |
| 280 | complain_overflow_signed, /* complain_on_overflow */ |
| 281 | bfd_elf_generic_reloc, /* special_function */ |
| 282 | "R_68K_TLS_LE16", /* name */ |
| 283 | FALSE, /* partial_inplace */ |
| 284 | 0, /* src_mask */ |
| 285 | 0x0000ffff, /* dst_mask */ |
| 286 | FALSE), /* pcrel_offset */ |
| 287 | |
| 288 | HOWTO (R_68K_TLS_LE8, /* type */ |
| 289 | 0, /* rightshift */ |
| 290 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 291 | 8, /* bitsize */ |
| 292 | FALSE, /* pc_relative */ |
| 293 | 0, /* bitpos */ |
| 294 | complain_overflow_signed, /* complain_on_overflow */ |
| 295 | bfd_elf_generic_reloc, /* special_function */ |
| 296 | "R_68K_TLS_LE8", /* name */ |
| 297 | FALSE, /* partial_inplace */ |
| 298 | 0, /* src_mask */ |
| 299 | 0x000000ff, /* dst_mask */ |
| 300 | FALSE), /* pcrel_offset */ |
| 301 | |
| 302 | /* TLS GD/LD dynamic relocations. */ |
| 303 | HOWTO (R_68K_TLS_DTPMOD32, /* type */ |
| 304 | 0, /* rightshift */ |
| 305 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 306 | 32, /* bitsize */ |
| 307 | FALSE, /* pc_relative */ |
| 308 | 0, /* bitpos */ |
| 309 | complain_overflow_dont, /* complain_on_overflow */ |
| 310 | bfd_elf_generic_reloc, /* special_function */ |
| 311 | "R_68K_TLS_DTPMOD32", /* name */ |
| 312 | FALSE, /* partial_inplace */ |
| 313 | 0, /* src_mask */ |
| 314 | 0xffffffff, /* dst_mask */ |
| 315 | FALSE), /* pcrel_offset */ |
| 316 | |
| 317 | HOWTO (R_68K_TLS_DTPREL32, /* type */ |
| 318 | 0, /* rightshift */ |
| 319 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 320 | 32, /* bitsize */ |
| 321 | FALSE, /* pc_relative */ |
| 322 | 0, /* bitpos */ |
| 323 | complain_overflow_dont, /* complain_on_overflow */ |
| 324 | bfd_elf_generic_reloc, /* special_function */ |
| 325 | "R_68K_TLS_DTPREL32", /* name */ |
| 326 | FALSE, /* partial_inplace */ |
| 327 | 0, /* src_mask */ |
| 328 | 0xffffffff, /* dst_mask */ |
| 329 | FALSE), /* pcrel_offset */ |
| 330 | |
| 331 | HOWTO (R_68K_TLS_TPREL32, /* type */ |
| 332 | 0, /* rightshift */ |
| 333 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 334 | 32, /* bitsize */ |
| 335 | FALSE, /* pc_relative */ |
| 336 | 0, /* bitpos */ |
| 337 | complain_overflow_dont, /* complain_on_overflow */ |
| 338 | bfd_elf_generic_reloc, /* special_function */ |
| 339 | "R_68K_TLS_TPREL32", /* name */ |
| 340 | FALSE, /* partial_inplace */ |
| 341 | 0, /* src_mask */ |
| 342 | 0xffffffff, /* dst_mask */ |
| 343 | FALSE), /* pcrel_offset */ |
| 344 | }; |
| 345 | |
| 346 | static void |
| 347 | rtype_to_howto (bfd *abfd, arelent *cache_ptr, Elf_Internal_Rela *dst) |
| 348 | { |
| 349 | unsigned int indx = ELF32_R_TYPE (dst->r_info); |
| 350 | |
| 351 | if (indx >= (unsigned int) R_68K_max) |
| 352 | { |
| 353 | (*_bfd_error_handler) (_("%B: invalid relocation type %d"), |
| 354 | abfd, (int) indx); |
| 355 | indx = R_68K_NONE; |
| 356 | } |
| 357 | cache_ptr->howto = &howto_table[indx]; |
| 358 | } |
| 359 | |
| 360 | #define elf_info_to_howto rtype_to_howto |
| 361 | |
| 362 | static const struct |
| 363 | { |
| 364 | bfd_reloc_code_real_type bfd_val; |
| 365 | int elf_val; |
| 366 | } |
| 367 | reloc_map[] = |
| 368 | { |
| 369 | { BFD_RELOC_NONE, R_68K_NONE }, |
| 370 | { BFD_RELOC_32, R_68K_32 }, |
| 371 | { BFD_RELOC_16, R_68K_16 }, |
| 372 | { BFD_RELOC_8, R_68K_8 }, |
| 373 | { BFD_RELOC_32_PCREL, R_68K_PC32 }, |
| 374 | { BFD_RELOC_16_PCREL, R_68K_PC16 }, |
| 375 | { BFD_RELOC_8_PCREL, R_68K_PC8 }, |
| 376 | { BFD_RELOC_32_GOT_PCREL, R_68K_GOT32 }, |
| 377 | { BFD_RELOC_16_GOT_PCREL, R_68K_GOT16 }, |
| 378 | { BFD_RELOC_8_GOT_PCREL, R_68K_GOT8 }, |
| 379 | { BFD_RELOC_32_GOTOFF, R_68K_GOT32O }, |
| 380 | { BFD_RELOC_16_GOTOFF, R_68K_GOT16O }, |
| 381 | { BFD_RELOC_8_GOTOFF, R_68K_GOT8O }, |
| 382 | { BFD_RELOC_32_PLT_PCREL, R_68K_PLT32 }, |
| 383 | { BFD_RELOC_16_PLT_PCREL, R_68K_PLT16 }, |
| 384 | { BFD_RELOC_8_PLT_PCREL, R_68K_PLT8 }, |
| 385 | { BFD_RELOC_32_PLTOFF, R_68K_PLT32O }, |
| 386 | { BFD_RELOC_16_PLTOFF, R_68K_PLT16O }, |
| 387 | { BFD_RELOC_8_PLTOFF, R_68K_PLT8O }, |
| 388 | { BFD_RELOC_NONE, R_68K_COPY }, |
| 389 | { BFD_RELOC_68K_GLOB_DAT, R_68K_GLOB_DAT }, |
| 390 | { BFD_RELOC_68K_JMP_SLOT, R_68K_JMP_SLOT }, |
| 391 | { BFD_RELOC_68K_RELATIVE, R_68K_RELATIVE }, |
| 392 | { BFD_RELOC_CTOR, R_68K_32 }, |
| 393 | { BFD_RELOC_VTABLE_INHERIT, R_68K_GNU_VTINHERIT }, |
| 394 | { BFD_RELOC_VTABLE_ENTRY, R_68K_GNU_VTENTRY }, |
| 395 | { BFD_RELOC_68K_TLS_GD32, R_68K_TLS_GD32 }, |
| 396 | { BFD_RELOC_68K_TLS_GD16, R_68K_TLS_GD16 }, |
| 397 | { BFD_RELOC_68K_TLS_GD8, R_68K_TLS_GD8 }, |
| 398 | { BFD_RELOC_68K_TLS_LDM32, R_68K_TLS_LDM32 }, |
| 399 | { BFD_RELOC_68K_TLS_LDM16, R_68K_TLS_LDM16 }, |
| 400 | { BFD_RELOC_68K_TLS_LDM8, R_68K_TLS_LDM8 }, |
| 401 | { BFD_RELOC_68K_TLS_LDO32, R_68K_TLS_LDO32 }, |
| 402 | { BFD_RELOC_68K_TLS_LDO16, R_68K_TLS_LDO16 }, |
| 403 | { BFD_RELOC_68K_TLS_LDO8, R_68K_TLS_LDO8 }, |
| 404 | { BFD_RELOC_68K_TLS_IE32, R_68K_TLS_IE32 }, |
| 405 | { BFD_RELOC_68K_TLS_IE16, R_68K_TLS_IE16 }, |
| 406 | { BFD_RELOC_68K_TLS_IE8, R_68K_TLS_IE8 }, |
| 407 | { BFD_RELOC_68K_TLS_LE32, R_68K_TLS_LE32 }, |
| 408 | { BFD_RELOC_68K_TLS_LE16, R_68K_TLS_LE16 }, |
| 409 | { BFD_RELOC_68K_TLS_LE8, R_68K_TLS_LE8 }, |
| 410 | }; |
| 411 | |
| 412 | static reloc_howto_type * |
| 413 | reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 414 | bfd_reloc_code_real_type code) |
| 415 | { |
| 416 | unsigned int i; |
| 417 | for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++) |
| 418 | { |
| 419 | if (reloc_map[i].bfd_val == code) |
| 420 | return &howto_table[reloc_map[i].elf_val]; |
| 421 | } |
| 422 | return 0; |
| 423 | } |
| 424 | |
| 425 | static reloc_howto_type * |
| 426 | reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name) |
| 427 | { |
| 428 | unsigned int i; |
| 429 | |
| 430 | for (i = 0; i < sizeof (howto_table) / sizeof (howto_table[0]); i++) |
| 431 | if (howto_table[i].name != NULL |
| 432 | && strcasecmp (howto_table[i].name, r_name) == 0) |
| 433 | return &howto_table[i]; |
| 434 | |
| 435 | return NULL; |
| 436 | } |
| 437 | |
| 438 | #define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup |
| 439 | #define bfd_elf32_bfd_reloc_name_lookup reloc_name_lookup |
| 440 | #define ELF_ARCH bfd_arch_m68k |
| 441 | #define ELF_TARGET_ID M68K_ELF_DATA |
| 442 | \f |
| 443 | /* Functions for the m68k ELF linker. */ |
| 444 | |
| 445 | /* The name of the dynamic interpreter. This is put in the .interp |
| 446 | section. */ |
| 447 | |
| 448 | #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" |
| 449 | |
| 450 | /* Describes one of the various PLT styles. */ |
| 451 | |
| 452 | struct elf_m68k_plt_info |
| 453 | { |
| 454 | /* The size of each PLT entry. */ |
| 455 | bfd_vma size; |
| 456 | |
| 457 | /* The template for the first PLT entry. */ |
| 458 | const bfd_byte *plt0_entry; |
| 459 | |
| 460 | /* Offsets of fields in PLT0_ENTRY that require R_68K_PC32 relocations. |
| 461 | The comments by each member indicate the value that the relocation |
| 462 | is against. */ |
| 463 | struct { |
| 464 | unsigned int got4; /* .got + 4 */ |
| 465 | unsigned int got8; /* .got + 8 */ |
| 466 | } plt0_relocs; |
| 467 | |
| 468 | /* The template for a symbol's PLT entry. */ |
| 469 | const bfd_byte *symbol_entry; |
| 470 | |
| 471 | /* Offsets of fields in SYMBOL_ENTRY that require R_68K_PC32 relocations. |
| 472 | The comments by each member indicate the value that the relocation |
| 473 | is against. */ |
| 474 | struct { |
| 475 | unsigned int got; /* the symbol's .got.plt entry */ |
| 476 | unsigned int plt; /* .plt */ |
| 477 | } symbol_relocs; |
| 478 | |
| 479 | /* The offset of the resolver stub from the start of SYMBOL_ENTRY. |
| 480 | The stub starts with "move.l #relocoffset,%d0". */ |
| 481 | bfd_vma symbol_resolve_entry; |
| 482 | }; |
| 483 | |
| 484 | /* The size in bytes of an entry in the procedure linkage table. */ |
| 485 | |
| 486 | #define PLT_ENTRY_SIZE 20 |
| 487 | |
| 488 | /* The first entry in a procedure linkage table looks like this. See |
| 489 | the SVR4 ABI m68k supplement to see how this works. */ |
| 490 | |
| 491 | static const bfd_byte elf_m68k_plt0_entry[PLT_ENTRY_SIZE] = |
| 492 | { |
| 493 | 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */ |
| 494 | 0, 0, 0, 2, /* + (.got + 4) - . */ |
| 495 | 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,addr]) */ |
| 496 | 0, 0, 0, 2, /* + (.got + 8) - . */ |
| 497 | 0, 0, 0, 0 /* pad out to 20 bytes. */ |
| 498 | }; |
| 499 | |
| 500 | /* Subsequent entries in a procedure linkage table look like this. */ |
| 501 | |
| 502 | static const bfd_byte elf_m68k_plt_entry[PLT_ENTRY_SIZE] = |
| 503 | { |
| 504 | 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,symbol@GOTPC]) */ |
| 505 | 0, 0, 0, 2, /* + (.got.plt entry) - . */ |
| 506 | 0x2f, 0x3c, /* move.l #offset,-(%sp) */ |
| 507 | 0, 0, 0, 0, /* + reloc index */ |
| 508 | 0x60, 0xff, /* bra.l .plt */ |
| 509 | 0, 0, 0, 0 /* + .plt - . */ |
| 510 | }; |
| 511 | |
| 512 | static const struct elf_m68k_plt_info elf_m68k_plt_info = { |
| 513 | PLT_ENTRY_SIZE, |
| 514 | elf_m68k_plt0_entry, { 4, 12 }, |
| 515 | elf_m68k_plt_entry, { 4, 16 }, 8 |
| 516 | }; |
| 517 | |
| 518 | #define ISAB_PLT_ENTRY_SIZE 24 |
| 519 | |
| 520 | static const bfd_byte elf_isab_plt0_entry[ISAB_PLT_ENTRY_SIZE] = |
| 521 | { |
| 522 | 0x20, 0x3c, /* move.l #offset,%d0 */ |
| 523 | 0, 0, 0, 0, /* + (.got + 4) - . */ |
| 524 | 0x2f, 0x3b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l),-(%sp) */ |
| 525 | 0x20, 0x3c, /* move.l #offset,%d0 */ |
| 526 | 0, 0, 0, 0, /* + (.got + 8) - . */ |
| 527 | 0x20, 0x7b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l), %a0 */ |
| 528 | 0x4e, 0xd0, /* jmp (%a0) */ |
| 529 | 0x4e, 0x71 /* nop */ |
| 530 | }; |
| 531 | |
| 532 | /* Subsequent entries in a procedure linkage table look like this. */ |
| 533 | |
| 534 | static const bfd_byte elf_isab_plt_entry[ISAB_PLT_ENTRY_SIZE] = |
| 535 | { |
| 536 | 0x20, 0x3c, /* move.l #offset,%d0 */ |
| 537 | 0, 0, 0, 0, /* + (.got.plt entry) - . */ |
| 538 | 0x20, 0x7b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l), %a0 */ |
| 539 | 0x4e, 0xd0, /* jmp (%a0) */ |
| 540 | 0x2f, 0x3c, /* move.l #offset,-(%sp) */ |
| 541 | 0, 0, 0, 0, /* + reloc index */ |
| 542 | 0x60, 0xff, /* bra.l .plt */ |
| 543 | 0, 0, 0, 0 /* + .plt - . */ |
| 544 | }; |
| 545 | |
| 546 | static const struct elf_m68k_plt_info elf_isab_plt_info = { |
| 547 | ISAB_PLT_ENTRY_SIZE, |
| 548 | elf_isab_plt0_entry, { 2, 12 }, |
| 549 | elf_isab_plt_entry, { 2, 20 }, 12 |
| 550 | }; |
| 551 | |
| 552 | #define ISAC_PLT_ENTRY_SIZE 24 |
| 553 | |
| 554 | static const bfd_byte elf_isac_plt0_entry[ISAC_PLT_ENTRY_SIZE] = |
| 555 | { |
| 556 | 0x20, 0x3c, /* move.l #offset,%d0 */ |
| 557 | 0, 0, 0, 0, /* replaced with .got + 4 - . */ |
| 558 | 0x2e, 0xbb, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l),(%sp) */ |
| 559 | 0x20, 0x3c, /* move.l #offset,%d0 */ |
| 560 | 0, 0, 0, 0, /* replaced with .got + 8 - . */ |
| 561 | 0x20, 0x7b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l), %a0 */ |
| 562 | 0x4e, 0xd0, /* jmp (%a0) */ |
| 563 | 0x4e, 0x71 /* nop */ |
| 564 | }; |
| 565 | |
| 566 | /* Subsequent entries in a procedure linkage table look like this. */ |
| 567 | |
| 568 | static const bfd_byte elf_isac_plt_entry[ISAC_PLT_ENTRY_SIZE] = |
| 569 | { |
| 570 | 0x20, 0x3c, /* move.l #offset,%d0 */ |
| 571 | 0, 0, 0, 0, /* replaced with (.got entry) - . */ |
| 572 | 0x20, 0x7b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l), %a0 */ |
| 573 | 0x4e, 0xd0, /* jmp (%a0) */ |
| 574 | 0x2f, 0x3c, /* move.l #offset,-(%sp) */ |
| 575 | 0, 0, 0, 0, /* replaced with offset into relocation table */ |
| 576 | 0x61, 0xff, /* bsr.l .plt */ |
| 577 | 0, 0, 0, 0 /* replaced with .plt - . */ |
| 578 | }; |
| 579 | |
| 580 | static const struct elf_m68k_plt_info elf_isac_plt_info = { |
| 581 | ISAC_PLT_ENTRY_SIZE, |
| 582 | elf_isac_plt0_entry, { 2, 12}, |
| 583 | elf_isac_plt_entry, { 2, 20 }, 12 |
| 584 | }; |
| 585 | |
| 586 | #define CPU32_PLT_ENTRY_SIZE 24 |
| 587 | /* Procedure linkage table entries for the cpu32 */ |
| 588 | static const bfd_byte elf_cpu32_plt0_entry[CPU32_PLT_ENTRY_SIZE] = |
| 589 | { |
| 590 | 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */ |
| 591 | 0, 0, 0, 2, /* + (.got + 4) - . */ |
| 592 | 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */ |
| 593 | 0, 0, 0, 2, /* + (.got + 8) - . */ |
| 594 | 0x4e, 0xd1, /* jmp %a1@ */ |
| 595 | 0, 0, 0, 0, /* pad out to 24 bytes. */ |
| 596 | 0, 0 |
| 597 | }; |
| 598 | |
| 599 | static const bfd_byte elf_cpu32_plt_entry[CPU32_PLT_ENTRY_SIZE] = |
| 600 | { |
| 601 | 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */ |
| 602 | 0, 0, 0, 2, /* + (.got.plt entry) - . */ |
| 603 | 0x4e, 0xd1, /* jmp %a1@ */ |
| 604 | 0x2f, 0x3c, /* move.l #offset,-(%sp) */ |
| 605 | 0, 0, 0, 0, /* + reloc index */ |
| 606 | 0x60, 0xff, /* bra.l .plt */ |
| 607 | 0, 0, 0, 0, /* + .plt - . */ |
| 608 | 0, 0 |
| 609 | }; |
| 610 | |
| 611 | static const struct elf_m68k_plt_info elf_cpu32_plt_info = { |
| 612 | CPU32_PLT_ENTRY_SIZE, |
| 613 | elf_cpu32_plt0_entry, { 4, 12 }, |
| 614 | elf_cpu32_plt_entry, { 4, 18 }, 10 |
| 615 | }; |
| 616 | |
| 617 | /* The m68k linker needs to keep track of the number of relocs that it |
| 618 | decides to copy in check_relocs for each symbol. This is so that it |
| 619 | can discard PC relative relocs if it doesn't need them when linking |
| 620 | with -Bsymbolic. We store the information in a field extending the |
| 621 | regular ELF linker hash table. */ |
| 622 | |
| 623 | /* This structure keeps track of the number of PC relative relocs we have |
| 624 | copied for a given symbol. */ |
| 625 | |
| 626 | struct elf_m68k_pcrel_relocs_copied |
| 627 | { |
| 628 | /* Next section. */ |
| 629 | struct elf_m68k_pcrel_relocs_copied *next; |
| 630 | /* A section in dynobj. */ |
| 631 | asection *section; |
| 632 | /* Number of relocs copied in this section. */ |
| 633 | bfd_size_type count; |
| 634 | }; |
| 635 | |
| 636 | /* Forward declaration. */ |
| 637 | struct elf_m68k_got_entry; |
| 638 | |
| 639 | /* m68k ELF linker hash entry. */ |
| 640 | |
| 641 | struct elf_m68k_link_hash_entry |
| 642 | { |
| 643 | struct elf_link_hash_entry root; |
| 644 | |
| 645 | /* Number of PC relative relocs copied for this symbol. */ |
| 646 | struct elf_m68k_pcrel_relocs_copied *pcrel_relocs_copied; |
| 647 | |
| 648 | /* Key to got_entries. */ |
| 649 | unsigned long got_entry_key; |
| 650 | |
| 651 | /* List of GOT entries for this symbol. This list is build during |
| 652 | offset finalization and is used within elf_m68k_finish_dynamic_symbol |
| 653 | to traverse all GOT entries for a particular symbol. |
| 654 | |
| 655 | ??? We could've used root.got.glist field instead, but having |
| 656 | a separate field is cleaner. */ |
| 657 | struct elf_m68k_got_entry *glist; |
| 658 | }; |
| 659 | |
| 660 | #define elf_m68k_hash_entry(ent) ((struct elf_m68k_link_hash_entry *) (ent)) |
| 661 | |
| 662 | /* Key part of GOT entry in hashtable. */ |
| 663 | struct elf_m68k_got_entry_key |
| 664 | { |
| 665 | /* BFD in which this symbol was defined. NULL for global symbols. */ |
| 666 | const bfd *bfd; |
| 667 | |
| 668 | /* Symbol index. Either local symbol index or h->got_entry_key. */ |
| 669 | unsigned long symndx; |
| 670 | |
| 671 | /* Type is one of R_68K_GOT{8, 16, 32}O, R_68K_TLS_GD{8, 16, 32}, |
| 672 | R_68K_TLS_LDM{8, 16, 32} or R_68K_TLS_IE{8, 16, 32}. |
| 673 | |
| 674 | From perspective of hashtable key, only elf_m68k_got_reloc_type (type) |
| 675 | matters. That is, we distinguish between, say, R_68K_GOT16O |
| 676 | and R_68K_GOT32O when allocating offsets, but they are considered to be |
| 677 | the same when searching got->entries. */ |
| 678 | enum elf_m68k_reloc_type type; |
| 679 | }; |
| 680 | |
| 681 | /* Size of the GOT offset suitable for relocation. */ |
| 682 | enum elf_m68k_got_offset_size { R_8, R_16, R_32, R_LAST }; |
| 683 | |
| 684 | /* Entry of the GOT. */ |
| 685 | struct elf_m68k_got_entry |
| 686 | { |
| 687 | /* GOT entries are put into a got->entries hashtable. This is the key. */ |
| 688 | struct elf_m68k_got_entry_key key_; |
| 689 | |
| 690 | /* GOT entry data. We need s1 before offset finalization and s2 after. */ |
| 691 | union |
| 692 | { |
| 693 | struct |
| 694 | { |
| 695 | /* Number of times this entry is referenced. It is used to |
| 696 | filter out unnecessary GOT slots in elf_m68k_gc_sweep_hook. */ |
| 697 | bfd_vma refcount; |
| 698 | } s1; |
| 699 | |
| 700 | struct |
| 701 | { |
| 702 | /* Offset from the start of .got section. To calculate offset relative |
| 703 | to GOT pointer one should substract got->offset from this value. */ |
| 704 | bfd_vma offset; |
| 705 | |
| 706 | /* Pointer to the next GOT entry for this global symbol. |
| 707 | Symbols have at most one entry in one GOT, but might |
| 708 | have entries in more than one GOT. |
| 709 | Root of this list is h->glist. |
| 710 | NULL for local symbols. */ |
| 711 | struct elf_m68k_got_entry *next; |
| 712 | } s2; |
| 713 | } u; |
| 714 | }; |
| 715 | |
| 716 | /* Return representative type for relocation R_TYPE. |
| 717 | This is used to avoid enumerating many relocations in comparisons, |
| 718 | switches etc. */ |
| 719 | |
| 720 | static enum elf_m68k_reloc_type |
| 721 | elf_m68k_reloc_got_type (enum elf_m68k_reloc_type r_type) |
| 722 | { |
| 723 | switch (r_type) |
| 724 | { |
| 725 | /* In most cases R_68K_GOTx relocations require the very same |
| 726 | handling as R_68K_GOT32O relocation. In cases when we need |
| 727 | to distinguish between the two, we use explicitly compare against |
| 728 | r_type. */ |
| 729 | case R_68K_GOT32: |
| 730 | case R_68K_GOT16: |
| 731 | case R_68K_GOT8: |
| 732 | case R_68K_GOT32O: |
| 733 | case R_68K_GOT16O: |
| 734 | case R_68K_GOT8O: |
| 735 | return R_68K_GOT32O; |
| 736 | |
| 737 | case R_68K_TLS_GD32: |
| 738 | case R_68K_TLS_GD16: |
| 739 | case R_68K_TLS_GD8: |
| 740 | return R_68K_TLS_GD32; |
| 741 | |
| 742 | case R_68K_TLS_LDM32: |
| 743 | case R_68K_TLS_LDM16: |
| 744 | case R_68K_TLS_LDM8: |
| 745 | return R_68K_TLS_LDM32; |
| 746 | |
| 747 | case R_68K_TLS_IE32: |
| 748 | case R_68K_TLS_IE16: |
| 749 | case R_68K_TLS_IE8: |
| 750 | return R_68K_TLS_IE32; |
| 751 | |
| 752 | default: |
| 753 | BFD_ASSERT (FALSE); |
| 754 | return 0; |
| 755 | } |
| 756 | } |
| 757 | |
| 758 | /* Return size of the GOT entry offset for relocation R_TYPE. */ |
| 759 | |
| 760 | static enum elf_m68k_got_offset_size |
| 761 | elf_m68k_reloc_got_offset_size (enum elf_m68k_reloc_type r_type) |
| 762 | { |
| 763 | switch (r_type) |
| 764 | { |
| 765 | case R_68K_GOT32: case R_68K_GOT16: case R_68K_GOT8: |
| 766 | case R_68K_GOT32O: case R_68K_TLS_GD32: case R_68K_TLS_LDM32: |
| 767 | case R_68K_TLS_IE32: |
| 768 | return R_32; |
| 769 | |
| 770 | case R_68K_GOT16O: case R_68K_TLS_GD16: case R_68K_TLS_LDM16: |
| 771 | case R_68K_TLS_IE16: |
| 772 | return R_16; |
| 773 | |
| 774 | case R_68K_GOT8O: case R_68K_TLS_GD8: case R_68K_TLS_LDM8: |
| 775 | case R_68K_TLS_IE8: |
| 776 | return R_8; |
| 777 | |
| 778 | default: |
| 779 | BFD_ASSERT (FALSE); |
| 780 | return 0; |
| 781 | } |
| 782 | } |
| 783 | |
| 784 | /* Return number of GOT entries we need to allocate in GOT for |
| 785 | relocation R_TYPE. */ |
| 786 | |
| 787 | static bfd_vma |
| 788 | elf_m68k_reloc_got_n_slots (enum elf_m68k_reloc_type r_type) |
| 789 | { |
| 790 | switch (elf_m68k_reloc_got_type (r_type)) |
| 791 | { |
| 792 | case R_68K_GOT32O: |
| 793 | case R_68K_TLS_IE32: |
| 794 | return 1; |
| 795 | |
| 796 | case R_68K_TLS_GD32: |
| 797 | case R_68K_TLS_LDM32: |
| 798 | return 2; |
| 799 | |
| 800 | default: |
| 801 | BFD_ASSERT (FALSE); |
| 802 | return 0; |
| 803 | } |
| 804 | } |
| 805 | |
| 806 | /* Return TRUE if relocation R_TYPE is a TLS one. */ |
| 807 | |
| 808 | static bfd_boolean |
| 809 | elf_m68k_reloc_tls_p (enum elf_m68k_reloc_type r_type) |
| 810 | { |
| 811 | switch (r_type) |
| 812 | { |
| 813 | case R_68K_TLS_GD32: case R_68K_TLS_GD16: case R_68K_TLS_GD8: |
| 814 | case R_68K_TLS_LDM32: case R_68K_TLS_LDM16: case R_68K_TLS_LDM8: |
| 815 | case R_68K_TLS_LDO32: case R_68K_TLS_LDO16: case R_68K_TLS_LDO8: |
| 816 | case R_68K_TLS_IE32: case R_68K_TLS_IE16: case R_68K_TLS_IE8: |
| 817 | case R_68K_TLS_LE32: case R_68K_TLS_LE16: case R_68K_TLS_LE8: |
| 818 | case R_68K_TLS_DTPMOD32: case R_68K_TLS_DTPREL32: case R_68K_TLS_TPREL32: |
| 819 | return TRUE; |
| 820 | |
| 821 | default: |
| 822 | return FALSE; |
| 823 | } |
| 824 | } |
| 825 | |
| 826 | /* Data structure representing a single GOT. */ |
| 827 | struct elf_m68k_got |
| 828 | { |
| 829 | /* Hashtable of 'struct elf_m68k_got_entry's. |
| 830 | Starting size of this table is the maximum number of |
| 831 | R_68K_GOT8O entries. */ |
| 832 | htab_t entries; |
| 833 | |
| 834 | /* Number of R_x slots in this GOT. Some (e.g., TLS) entries require |
| 835 | several GOT slots. |
| 836 | |
| 837 | n_slots[R_8] is the count of R_8 slots in this GOT. |
| 838 | n_slots[R_16] is the cumulative count of R_8 and R_16 slots |
| 839 | in this GOT. |
| 840 | n_slots[R_32] is the cumulative count of R_8, R_16 and R_32 slots |
| 841 | in this GOT. This is the total number of slots. */ |
| 842 | bfd_vma n_slots[R_LAST]; |
| 843 | |
| 844 | /* Number of local (entry->key_.h == NULL) slots in this GOT. |
| 845 | This is only used to properly calculate size of .rela.got section; |
| 846 | see elf_m68k_partition_multi_got. */ |
| 847 | bfd_vma local_n_slots; |
| 848 | |
| 849 | /* Offset of this GOT relative to beginning of .got section. */ |
| 850 | bfd_vma offset; |
| 851 | }; |
| 852 | |
| 853 | /* BFD and its GOT. This is an entry in multi_got->bfd2got hashtable. */ |
| 854 | struct elf_m68k_bfd2got_entry |
| 855 | { |
| 856 | /* BFD. */ |
| 857 | const bfd *bfd; |
| 858 | |
| 859 | /* Assigned GOT. Before partitioning multi-GOT each BFD has its own |
| 860 | GOT structure. After partitioning several BFD's might [and often do] |
| 861 | share a single GOT. */ |
| 862 | struct elf_m68k_got *got; |
| 863 | }; |
| 864 | |
| 865 | /* The main data structure holding all the pieces. */ |
| 866 | struct elf_m68k_multi_got |
| 867 | { |
| 868 | /* Hashtable mapping each BFD to its GOT. If a BFD doesn't have an entry |
| 869 | here, then it doesn't need a GOT (this includes the case of a BFD |
| 870 | having an empty GOT). |
| 871 | |
| 872 | ??? This hashtable can be replaced by an array indexed by bfd->id. */ |
| 873 | htab_t bfd2got; |
| 874 | |
| 875 | /* Next symndx to assign a global symbol. |
| 876 | h->got_entry_key is initialized from this counter. */ |
| 877 | unsigned long global_symndx; |
| 878 | }; |
| 879 | |
| 880 | /* m68k ELF linker hash table. */ |
| 881 | |
| 882 | struct elf_m68k_link_hash_table |
| 883 | { |
| 884 | struct elf_link_hash_table root; |
| 885 | |
| 886 | /* Small local sym cache. */ |
| 887 | struct sym_cache sym_cache; |
| 888 | |
| 889 | /* The PLT format used by this link, or NULL if the format has not |
| 890 | yet been chosen. */ |
| 891 | const struct elf_m68k_plt_info *plt_info; |
| 892 | |
| 893 | /* True, if GP is loaded within each function which uses it. |
| 894 | Set to TRUE when GOT negative offsets or multi-GOT is enabled. */ |
| 895 | bfd_boolean local_gp_p; |
| 896 | |
| 897 | /* Switch controlling use of negative offsets to double the size of GOTs. */ |
| 898 | bfd_boolean use_neg_got_offsets_p; |
| 899 | |
| 900 | /* Switch controlling generation of multiple GOTs. */ |
| 901 | bfd_boolean allow_multigot_p; |
| 902 | |
| 903 | /* Multi-GOT data structure. */ |
| 904 | struct elf_m68k_multi_got multi_got_; |
| 905 | }; |
| 906 | |
| 907 | /* Get the m68k ELF linker hash table from a link_info structure. */ |
| 908 | |
| 909 | #define elf_m68k_hash_table(p) \ |
| 910 | (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \ |
| 911 | == M68K_ELF_DATA ? ((struct elf_m68k_link_hash_table *) ((p)->hash)) : NULL) |
| 912 | |
| 913 | /* Shortcut to multi-GOT data. */ |
| 914 | #define elf_m68k_multi_got(INFO) (&elf_m68k_hash_table (INFO)->multi_got_) |
| 915 | |
| 916 | /* Create an entry in an m68k ELF linker hash table. */ |
| 917 | |
| 918 | static struct bfd_hash_entry * |
| 919 | elf_m68k_link_hash_newfunc (struct bfd_hash_entry *entry, |
| 920 | struct bfd_hash_table *table, |
| 921 | const char *string) |
| 922 | { |
| 923 | struct bfd_hash_entry *ret = entry; |
| 924 | |
| 925 | /* Allocate the structure if it has not already been allocated by a |
| 926 | subclass. */ |
| 927 | if (ret == NULL) |
| 928 | ret = bfd_hash_allocate (table, |
| 929 | sizeof (struct elf_m68k_link_hash_entry)); |
| 930 | if (ret == NULL) |
| 931 | return ret; |
| 932 | |
| 933 | /* Call the allocation method of the superclass. */ |
| 934 | ret = _bfd_elf_link_hash_newfunc (ret, table, string); |
| 935 | if (ret != NULL) |
| 936 | { |
| 937 | elf_m68k_hash_entry (ret)->pcrel_relocs_copied = NULL; |
| 938 | elf_m68k_hash_entry (ret)->got_entry_key = 0; |
| 939 | elf_m68k_hash_entry (ret)->glist = NULL; |
| 940 | } |
| 941 | |
| 942 | return ret; |
| 943 | } |
| 944 | |
| 945 | /* Create an m68k ELF linker hash table. */ |
| 946 | |
| 947 | static struct bfd_link_hash_table * |
| 948 | elf_m68k_link_hash_table_create (bfd *abfd) |
| 949 | { |
| 950 | struct elf_m68k_link_hash_table *ret; |
| 951 | bfd_size_type amt = sizeof (struct elf_m68k_link_hash_table); |
| 952 | |
| 953 | ret = (struct elf_m68k_link_hash_table *) bfd_malloc (amt); |
| 954 | if (ret == (struct elf_m68k_link_hash_table *) NULL) |
| 955 | return NULL; |
| 956 | |
| 957 | if (!_bfd_elf_link_hash_table_init (&ret->root, abfd, |
| 958 | elf_m68k_link_hash_newfunc, |
| 959 | sizeof (struct elf_m68k_link_hash_entry), |
| 960 | M68K_ELF_DATA)) |
| 961 | { |
| 962 | free (ret); |
| 963 | return NULL; |
| 964 | } |
| 965 | |
| 966 | ret->sym_cache.abfd = NULL; |
| 967 | ret->plt_info = NULL; |
| 968 | ret->local_gp_p = FALSE; |
| 969 | ret->use_neg_got_offsets_p = FALSE; |
| 970 | ret->allow_multigot_p = FALSE; |
| 971 | ret->multi_got_.bfd2got = NULL; |
| 972 | ret->multi_got_.global_symndx = 1; |
| 973 | |
| 974 | return &ret->root.root; |
| 975 | } |
| 976 | |
| 977 | /* Destruct local data. */ |
| 978 | |
| 979 | static void |
| 980 | elf_m68k_link_hash_table_free (struct bfd_link_hash_table *_htab) |
| 981 | { |
| 982 | struct elf_m68k_link_hash_table *htab; |
| 983 | |
| 984 | htab = (struct elf_m68k_link_hash_table *) _htab; |
| 985 | |
| 986 | if (htab->multi_got_.bfd2got != NULL) |
| 987 | { |
| 988 | htab_delete (htab->multi_got_.bfd2got); |
| 989 | htab->multi_got_.bfd2got = NULL; |
| 990 | } |
| 991 | } |
| 992 | |
| 993 | /* Set the right machine number. */ |
| 994 | |
| 995 | static bfd_boolean |
| 996 | elf32_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 | |
| 1056 | static void |
| 1057 | elf_m68k_final_write_processing (bfd *abfd, |
| 1058 | bfd_boolean linker ATTRIBUTE_UNUSED) |
| 1059 | { |
| 1060 | int mach = bfd_get_mach (abfd); |
| 1061 | unsigned long e_flags = elf_elfheader (abfd)->e_flags; |
| 1062 | |
| 1063 | if (!e_flags) |
| 1064 | { |
| 1065 | unsigned int arch_mask; |
| 1066 | |
| 1067 | arch_mask = bfd_m68k_mach_to_features (mach); |
| 1068 | |
| 1069 | if (arch_mask & m68000) |
| 1070 | e_flags = EF_M68K_M68000; |
| 1071 | else if (arch_mask & cpu32) |
| 1072 | e_flags = EF_M68K_CPU32; |
| 1073 | else if (arch_mask & fido_a) |
| 1074 | e_flags = EF_M68K_FIDO; |
| 1075 | else |
| 1076 | { |
| 1077 | switch (arch_mask |
| 1078 | & (mcfisa_a | mcfisa_aa | mcfisa_b | mcfisa_c | mcfhwdiv | mcfusp)) |
| 1079 | { |
| 1080 | case mcfisa_a: |
| 1081 | e_flags |= EF_M68K_CF_ISA_A_NODIV; |
| 1082 | break; |
| 1083 | case mcfisa_a | mcfhwdiv: |
| 1084 | e_flags |= EF_M68K_CF_ISA_A; |
| 1085 | break; |
| 1086 | case mcfisa_a | mcfisa_aa | mcfhwdiv | mcfusp: |
| 1087 | e_flags |= EF_M68K_CF_ISA_A_PLUS; |
| 1088 | break; |
| 1089 | case mcfisa_a | mcfisa_b | mcfhwdiv: |
| 1090 | e_flags |= EF_M68K_CF_ISA_B_NOUSP; |
| 1091 | break; |
| 1092 | case mcfisa_a | mcfisa_b | mcfhwdiv | mcfusp: |
| 1093 | e_flags |= EF_M68K_CF_ISA_B; |
| 1094 | break; |
| 1095 | case mcfisa_a | mcfisa_c | mcfhwdiv | mcfusp: |
| 1096 | e_flags |= EF_M68K_CF_ISA_C; |
| 1097 | break; |
| 1098 | case mcfisa_a | mcfisa_c | mcfusp: |
| 1099 | e_flags |= EF_M68K_CF_ISA_C_NODIV; |
| 1100 | break; |
| 1101 | } |
| 1102 | if (arch_mask & mcfmac) |
| 1103 | e_flags |= EF_M68K_CF_MAC; |
| 1104 | else if (arch_mask & mcfemac) |
| 1105 | e_flags |= EF_M68K_CF_EMAC; |
| 1106 | if (arch_mask & cfloat) |
| 1107 | e_flags |= EF_M68K_CF_FLOAT | EF_M68K_CFV4E; |
| 1108 | } |
| 1109 | elf_elfheader (abfd)->e_flags = e_flags; |
| 1110 | } |
| 1111 | } |
| 1112 | |
| 1113 | /* Keep m68k-specific flags in the ELF header. */ |
| 1114 | |
| 1115 | static bfd_boolean |
| 1116 | elf32_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 backend specific data from an object file to the output |
| 1124 | object file when linking. */ |
| 1125 | static bfd_boolean |
| 1126 | elf32_m68k_merge_private_bfd_data (bfd *ibfd, bfd *obfd) |
| 1127 | { |
| 1128 | flagword out_flags; |
| 1129 | flagword in_flags; |
| 1130 | flagword out_isa; |
| 1131 | flagword in_isa; |
| 1132 | const bfd_arch_info_type *arch_info; |
| 1133 | |
| 1134 | if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour |
| 1135 | || bfd_get_flavour (obfd) != bfd_target_elf_flavour) |
| 1136 | return FALSE; |
| 1137 | |
| 1138 | /* Get the merged machine. This checks for incompatibility between |
| 1139 | Coldfire & non-Coldfire flags, incompability between different |
| 1140 | Coldfire ISAs, and incompability between different MAC types. */ |
| 1141 | arch_info = bfd_arch_get_compatible (ibfd, obfd, FALSE); |
| 1142 | if (!arch_info) |
| 1143 | return FALSE; |
| 1144 | |
| 1145 | bfd_set_arch_mach (obfd, bfd_arch_m68k, arch_info->mach); |
| 1146 | |
| 1147 | in_flags = elf_elfheader (ibfd)->e_flags; |
| 1148 | if (!elf_flags_init (obfd)) |
| 1149 | { |
| 1150 | elf_flags_init (obfd) = TRUE; |
| 1151 | out_flags = in_flags; |
| 1152 | } |
| 1153 | else |
| 1154 | { |
| 1155 | out_flags = elf_elfheader (obfd)->e_flags; |
| 1156 | unsigned int variant_mask; |
| 1157 | |
| 1158 | if ((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_M68000) |
| 1159 | variant_mask = 0; |
| 1160 | else if ((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32) |
| 1161 | variant_mask = 0; |
| 1162 | else if ((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO) |
| 1163 | variant_mask = 0; |
| 1164 | else |
| 1165 | variant_mask = EF_M68K_CF_ISA_MASK; |
| 1166 | |
| 1167 | in_isa = (in_flags & variant_mask); |
| 1168 | out_isa = (out_flags & variant_mask); |
| 1169 | if (in_isa > out_isa) |
| 1170 | out_flags ^= in_isa ^ out_isa; |
| 1171 | if (((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32 |
| 1172 | && (out_flags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO) |
| 1173 | || ((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO |
| 1174 | && (out_flags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32)) |
| 1175 | out_flags = EF_M68K_FIDO; |
| 1176 | else |
| 1177 | out_flags |= in_flags ^ in_isa; |
| 1178 | } |
| 1179 | elf_elfheader (obfd)->e_flags = out_flags; |
| 1180 | |
| 1181 | return TRUE; |
| 1182 | } |
| 1183 | |
| 1184 | /* Display the flags field. */ |
| 1185 | |
| 1186 | static bfd_boolean |
| 1187 | elf32_m68k_print_private_bfd_data (bfd *abfd, void * ptr) |
| 1188 | { |
| 1189 | FILE *file = (FILE *) ptr; |
| 1190 | flagword eflags = elf_elfheader (abfd)->e_flags; |
| 1191 | |
| 1192 | BFD_ASSERT (abfd != NULL && ptr != NULL); |
| 1193 | |
| 1194 | /* Print normal ELF private data. */ |
| 1195 | _bfd_elf_print_private_bfd_data (abfd, ptr); |
| 1196 | |
| 1197 | /* Ignore init flag - it may not be set, despite the flags field containing valid data. */ |
| 1198 | |
| 1199 | /* xgettext:c-format */ |
| 1200 | fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); |
| 1201 | |
| 1202 | if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_M68000) |
| 1203 | fprintf (file, " [m68000]"); |
| 1204 | else if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32) |
| 1205 | fprintf (file, " [cpu32]"); |
| 1206 | else if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO) |
| 1207 | fprintf (file, " [fido]"); |
| 1208 | else |
| 1209 | { |
| 1210 | if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_CFV4E) |
| 1211 | fprintf (file, " [cfv4e]"); |
| 1212 | |
| 1213 | if (eflags & EF_M68K_CF_ISA_MASK) |
| 1214 | { |
| 1215 | char const *isa = _("unknown"); |
| 1216 | char const *mac = _("unknown"); |
| 1217 | char const *additional = ""; |
| 1218 | |
| 1219 | switch (eflags & EF_M68K_CF_ISA_MASK) |
| 1220 | { |
| 1221 | case EF_M68K_CF_ISA_A_NODIV: |
| 1222 | isa = "A"; |
| 1223 | additional = " [nodiv]"; |
| 1224 | break; |
| 1225 | case EF_M68K_CF_ISA_A: |
| 1226 | isa = "A"; |
| 1227 | break; |
| 1228 | case EF_M68K_CF_ISA_A_PLUS: |
| 1229 | isa = "A+"; |
| 1230 | break; |
| 1231 | case EF_M68K_CF_ISA_B_NOUSP: |
| 1232 | isa = "B"; |
| 1233 | additional = " [nousp]"; |
| 1234 | break; |
| 1235 | case EF_M68K_CF_ISA_B: |
| 1236 | isa = "B"; |
| 1237 | break; |
| 1238 | case EF_M68K_CF_ISA_C: |
| 1239 | isa = "C"; |
| 1240 | break; |
| 1241 | case EF_M68K_CF_ISA_C_NODIV: |
| 1242 | isa = "C"; |
| 1243 | additional = " [nodiv]"; |
| 1244 | break; |
| 1245 | } |
| 1246 | fprintf (file, " [isa %s]%s", isa, additional); |
| 1247 | |
| 1248 | if (eflags & EF_M68K_CF_FLOAT) |
| 1249 | fprintf (file, " [float]"); |
| 1250 | |
| 1251 | switch (eflags & EF_M68K_CF_MAC_MASK) |
| 1252 | { |
| 1253 | case 0: |
| 1254 | mac = NULL; |
| 1255 | break; |
| 1256 | case EF_M68K_CF_MAC: |
| 1257 | mac = "mac"; |
| 1258 | break; |
| 1259 | case EF_M68K_CF_EMAC: |
| 1260 | mac = "emac"; |
| 1261 | break; |
| 1262 | case EF_M68K_CF_EMAC_B: |
| 1263 | mac = "emac_b"; |
| 1264 | break; |
| 1265 | } |
| 1266 | if (mac) |
| 1267 | fprintf (file, " [%s]", mac); |
| 1268 | } |
| 1269 | } |
| 1270 | |
| 1271 | fputc ('\n', file); |
| 1272 | |
| 1273 | return TRUE; |
| 1274 | } |
| 1275 | |
| 1276 | /* Multi-GOT support implementation design: |
| 1277 | |
| 1278 | Multi-GOT starts in check_relocs hook. There we scan all |
| 1279 | relocations of a BFD and build a local GOT (struct elf_m68k_got) |
| 1280 | for it. If a single BFD appears to require too many GOT slots with |
| 1281 | R_68K_GOT8O or R_68K_GOT16O relocations, we fail with notification |
| 1282 | to user. |
| 1283 | After check_relocs has been invoked for each input BFD, we have |
| 1284 | constructed a GOT for each input BFD. |
| 1285 | |
| 1286 | To minimize total number of GOTs required for a particular output BFD |
| 1287 | (as some environments support only 1 GOT per output object) we try |
| 1288 | to merge some of the GOTs to share an offset space. Ideally [and in most |
| 1289 | cases] we end up with a single GOT. In cases when there are too many |
| 1290 | restricted relocations (e.g., R_68K_GOT16O relocations) we end up with |
| 1291 | several GOTs, assuming the environment can handle them. |
| 1292 | |
| 1293 | Partitioning is done in elf_m68k_partition_multi_got. We start with |
| 1294 | an empty GOT and traverse bfd2got hashtable putting got_entries from |
| 1295 | local GOTs to the new 'big' one. We do that by constructing an |
| 1296 | intermediate GOT holding all the entries the local GOT has and the big |
| 1297 | GOT lacks. Then we check if there is room in the big GOT to accomodate |
| 1298 | all the entries from diff. On success we add those entries to the big |
| 1299 | GOT; on failure we start the new 'big' GOT and retry the adding of |
| 1300 | entries from the local GOT. Note that this retry will always succeed as |
| 1301 | each local GOT doesn't overflow the limits. After partitioning we |
| 1302 | end up with each bfd assigned one of the big GOTs. GOT entries in the |
| 1303 | big GOTs are initialized with GOT offsets. Note that big GOTs are |
| 1304 | positioned consequently in program space and represent a single huge GOT |
| 1305 | to the outside world. |
| 1306 | |
| 1307 | After that we get to elf_m68k_relocate_section. There we |
| 1308 | adjust relocations of GOT pointer (_GLOBAL_OFFSET_TABLE_) and symbol |
| 1309 | relocations to refer to appropriate [assigned to current input_bfd] |
| 1310 | big GOT. |
| 1311 | |
| 1312 | Notes: |
| 1313 | |
| 1314 | GOT entry type: We have several types of GOT entries. |
| 1315 | * R_8 type is used in entries for symbols that have at least one |
| 1316 | R_68K_GOT8O or R_68K_TLS_*8 relocation. We can have at most 0x40 |
| 1317 | such entries in one GOT. |
| 1318 | * R_16 type is used in entries for symbols that have at least one |
| 1319 | R_68K_GOT16O or R_68K_TLS_*16 relocation and no R_8 relocations. |
| 1320 | We can have at most 0x4000 such entries in one GOT. |
| 1321 | * R_32 type is used in all other cases. We can have as many |
| 1322 | such entries in one GOT as we'd like. |
| 1323 | When counting relocations we have to include the count of the smaller |
| 1324 | ranged relocations in the counts of the larger ranged ones in order |
| 1325 | to correctly detect overflow. |
| 1326 | |
| 1327 | Sorting the GOT: In each GOT starting offsets are assigned to |
| 1328 | R_8 entries, which are followed by R_16 entries, and |
| 1329 | R_32 entries go at the end. See finalize_got_offsets for details. |
| 1330 | |
| 1331 | Negative GOT offsets: To double usable offset range of GOTs we use |
| 1332 | negative offsets. As we assign entries with GOT offsets relative to |
| 1333 | start of .got section, the offset values are positive. They become |
| 1334 | negative only in relocate_section where got->offset value is |
| 1335 | subtracted from them. |
| 1336 | |
| 1337 | 3 special GOT entries: There are 3 special GOT entries used internally |
| 1338 | by loader. These entries happen to be placed to .got.plt section, |
| 1339 | so we don't do anything about them in multi-GOT support. |
| 1340 | |
| 1341 | Memory management: All data except for hashtables |
| 1342 | multi_got->bfd2got and got->entries are allocated on |
| 1343 | elf_hash_table (info)->dynobj bfd (for this reason we pass 'info' |
| 1344 | to most functions), so we don't need to care to free them. At the |
| 1345 | moment of allocation hashtables are being linked into main data |
| 1346 | structure (multi_got), all pieces of which are reachable from |
| 1347 | elf_m68k_multi_got (info). We deallocate them in |
| 1348 | elf_m68k_link_hash_table_free. */ |
| 1349 | |
| 1350 | /* Initialize GOT. */ |
| 1351 | |
| 1352 | static void |
| 1353 | elf_m68k_init_got (struct elf_m68k_got *got) |
| 1354 | { |
| 1355 | got->entries = NULL; |
| 1356 | got->n_slots[R_8] = 0; |
| 1357 | got->n_slots[R_16] = 0; |
| 1358 | got->n_slots[R_32] = 0; |
| 1359 | got->local_n_slots = 0; |
| 1360 | got->offset = (bfd_vma) -1; |
| 1361 | } |
| 1362 | |
| 1363 | /* Destruct GOT. */ |
| 1364 | |
| 1365 | static void |
| 1366 | elf_m68k_clear_got (struct elf_m68k_got *got) |
| 1367 | { |
| 1368 | if (got->entries != NULL) |
| 1369 | { |
| 1370 | htab_delete (got->entries); |
| 1371 | got->entries = NULL; |
| 1372 | } |
| 1373 | } |
| 1374 | |
| 1375 | /* Create and empty GOT structure. INFO is the context where memory |
| 1376 | should be allocated. */ |
| 1377 | |
| 1378 | static struct elf_m68k_got * |
| 1379 | elf_m68k_create_empty_got (struct bfd_link_info *info) |
| 1380 | { |
| 1381 | struct elf_m68k_got *got; |
| 1382 | |
| 1383 | got = bfd_alloc (elf_hash_table (info)->dynobj, sizeof (*got)); |
| 1384 | if (got == NULL) |
| 1385 | return NULL; |
| 1386 | |
| 1387 | elf_m68k_init_got (got); |
| 1388 | |
| 1389 | return got; |
| 1390 | } |
| 1391 | |
| 1392 | /* Initialize KEY. */ |
| 1393 | |
| 1394 | static void |
| 1395 | elf_m68k_init_got_entry_key (struct elf_m68k_got_entry_key *key, |
| 1396 | struct elf_link_hash_entry *h, |
| 1397 | const bfd *abfd, unsigned long symndx, |
| 1398 | enum elf_m68k_reloc_type reloc_type) |
| 1399 | { |
| 1400 | if (elf_m68k_reloc_got_type (reloc_type) == R_68K_TLS_LDM32) |
| 1401 | /* All TLS_LDM relocations share a single GOT entry. */ |
| 1402 | { |
| 1403 | key->bfd = NULL; |
| 1404 | key->symndx = 0; |
| 1405 | } |
| 1406 | else if (h != NULL) |
| 1407 | /* Global symbols are identified with their got_entry_key. */ |
| 1408 | { |
| 1409 | key->bfd = NULL; |
| 1410 | key->symndx = elf_m68k_hash_entry (h)->got_entry_key; |
| 1411 | BFD_ASSERT (key->symndx != 0); |
| 1412 | } |
| 1413 | else |
| 1414 | /* Local symbols are identified by BFD they appear in and symndx. */ |
| 1415 | { |
| 1416 | key->bfd = abfd; |
| 1417 | key->symndx = symndx; |
| 1418 | } |
| 1419 | |
| 1420 | key->type = reloc_type; |
| 1421 | } |
| 1422 | |
| 1423 | /* Calculate hash of got_entry. |
| 1424 | ??? Is it good? */ |
| 1425 | |
| 1426 | static hashval_t |
| 1427 | elf_m68k_got_entry_hash (const void *_entry) |
| 1428 | { |
| 1429 | const struct elf_m68k_got_entry_key *key; |
| 1430 | |
| 1431 | key = &((const struct elf_m68k_got_entry *) _entry)->key_; |
| 1432 | |
| 1433 | return (key->symndx |
| 1434 | + (key->bfd != NULL ? (int) key->bfd->id : -1) |
| 1435 | + elf_m68k_reloc_got_type (key->type)); |
| 1436 | } |
| 1437 | |
| 1438 | /* Check if two got entries are equal. */ |
| 1439 | |
| 1440 | static int |
| 1441 | elf_m68k_got_entry_eq (const void *_entry1, const void *_entry2) |
| 1442 | { |
| 1443 | const struct elf_m68k_got_entry_key *key1; |
| 1444 | const struct elf_m68k_got_entry_key *key2; |
| 1445 | |
| 1446 | key1 = &((const struct elf_m68k_got_entry *) _entry1)->key_; |
| 1447 | key2 = &((const struct elf_m68k_got_entry *) _entry2)->key_; |
| 1448 | |
| 1449 | return (key1->bfd == key2->bfd |
| 1450 | && key1->symndx == key2->symndx |
| 1451 | && (elf_m68k_reloc_got_type (key1->type) |
| 1452 | == elf_m68k_reloc_got_type (key2->type))); |
| 1453 | } |
| 1454 | |
| 1455 | /* When using negative offsets, we allocate one extra R_8, one extra R_16 |
| 1456 | and one extra R_32 slots to simplify handling of 2-slot entries during |
| 1457 | offset allocation -- hence -1 for R_8 slots and -2 for R_16 slots. */ |
| 1458 | |
| 1459 | /* Maximal number of R_8 slots in a single GOT. */ |
| 1460 | #define ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT(INFO) \ |
| 1461 | (elf_m68k_hash_table (INFO)->use_neg_got_offsets_p \ |
| 1462 | ? (0x40 - 1) \ |
| 1463 | : 0x20) |
| 1464 | |
| 1465 | /* Maximal number of R_8 and R_16 slots in a single GOT. */ |
| 1466 | #define ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT(INFO) \ |
| 1467 | (elf_m68k_hash_table (INFO)->use_neg_got_offsets_p \ |
| 1468 | ? (0x4000 - 2) \ |
| 1469 | : 0x2000) |
| 1470 | |
| 1471 | /* SEARCH - simply search the hashtable, don't insert new entries or fail when |
| 1472 | the entry cannot be found. |
| 1473 | FIND_OR_CREATE - search for an existing entry, but create new if there's |
| 1474 | no such. |
| 1475 | MUST_FIND - search for an existing entry and assert that it exist. |
| 1476 | MUST_CREATE - assert that there's no such entry and create new one. */ |
| 1477 | enum elf_m68k_get_entry_howto |
| 1478 | { |
| 1479 | SEARCH, |
| 1480 | FIND_OR_CREATE, |
| 1481 | MUST_FIND, |
| 1482 | MUST_CREATE |
| 1483 | }; |
| 1484 | |
| 1485 | /* Get or create (depending on HOWTO) entry with KEY in GOT. |
| 1486 | INFO is context in which memory should be allocated (can be NULL if |
| 1487 | HOWTO is SEARCH or MUST_FIND). */ |
| 1488 | |
| 1489 | static struct elf_m68k_got_entry * |
| 1490 | elf_m68k_get_got_entry (struct elf_m68k_got *got, |
| 1491 | const struct elf_m68k_got_entry_key *key, |
| 1492 | enum elf_m68k_get_entry_howto howto, |
| 1493 | struct bfd_link_info *info) |
| 1494 | { |
| 1495 | struct elf_m68k_got_entry entry_; |
| 1496 | struct elf_m68k_got_entry *entry; |
| 1497 | void **ptr; |
| 1498 | |
| 1499 | BFD_ASSERT ((info == NULL) == (howto == SEARCH || howto == MUST_FIND)); |
| 1500 | |
| 1501 | if (got->entries == NULL) |
| 1502 | /* This is the first entry in ABFD. Initialize hashtable. */ |
| 1503 | { |
| 1504 | if (howto == SEARCH) |
| 1505 | return NULL; |
| 1506 | |
| 1507 | got->entries = htab_try_create (ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT |
| 1508 | (info), |
| 1509 | elf_m68k_got_entry_hash, |
| 1510 | elf_m68k_got_entry_eq, NULL); |
| 1511 | if (got->entries == NULL) |
| 1512 | { |
| 1513 | bfd_set_error (bfd_error_no_memory); |
| 1514 | return NULL; |
| 1515 | } |
| 1516 | } |
| 1517 | |
| 1518 | entry_.key_ = *key; |
| 1519 | ptr = htab_find_slot (got->entries, &entry_, (howto != SEARCH |
| 1520 | ? INSERT : NO_INSERT)); |
| 1521 | if (ptr == NULL) |
| 1522 | { |
| 1523 | if (howto == SEARCH) |
| 1524 | /* Entry not found. */ |
| 1525 | return NULL; |
| 1526 | |
| 1527 | /* We're out of memory. */ |
| 1528 | bfd_set_error (bfd_error_no_memory); |
| 1529 | return NULL; |
| 1530 | } |
| 1531 | |
| 1532 | if (*ptr == NULL) |
| 1533 | /* We didn't find the entry and we're asked to create a new one. */ |
| 1534 | { |
| 1535 | BFD_ASSERT (howto != MUST_FIND && howto != SEARCH); |
| 1536 | |
| 1537 | entry = bfd_alloc (elf_hash_table (info)->dynobj, sizeof (*entry)); |
| 1538 | if (entry == NULL) |
| 1539 | return NULL; |
| 1540 | |
| 1541 | /* Initialize new entry. */ |
| 1542 | entry->key_ = *key; |
| 1543 | |
| 1544 | entry->u.s1.refcount = 0; |
| 1545 | |
| 1546 | /* Mark the entry as not initialized. */ |
| 1547 | entry->key_.type = R_68K_max; |
| 1548 | |
| 1549 | *ptr = entry; |
| 1550 | } |
| 1551 | else |
| 1552 | /* We found the entry. */ |
| 1553 | { |
| 1554 | BFD_ASSERT (howto != MUST_CREATE); |
| 1555 | |
| 1556 | entry = *ptr; |
| 1557 | } |
| 1558 | |
| 1559 | return entry; |
| 1560 | } |
| 1561 | |
| 1562 | /* Update GOT counters when merging entry of WAS type with entry of NEW type. |
| 1563 | Return the value to which ENTRY's type should be set. */ |
| 1564 | |
| 1565 | static enum elf_m68k_reloc_type |
| 1566 | elf_m68k_update_got_entry_type (struct elf_m68k_got *got, |
| 1567 | enum elf_m68k_reloc_type was, |
| 1568 | enum elf_m68k_reloc_type new_reloc) |
| 1569 | { |
| 1570 | enum elf_m68k_got_offset_size was_size; |
| 1571 | enum elf_m68k_got_offset_size new_size; |
| 1572 | bfd_vma n_slots; |
| 1573 | |
| 1574 | if (was == R_68K_max) |
| 1575 | /* The type of the entry is not initialized yet. */ |
| 1576 | { |
| 1577 | /* Update all got->n_slots counters, including n_slots[R_32]. */ |
| 1578 | was_size = R_LAST; |
| 1579 | |
| 1580 | was = new_reloc; |
| 1581 | } |
| 1582 | else |
| 1583 | { |
| 1584 | /* !!! We, probably, should emit an error rather then fail on assert |
| 1585 | in such a case. */ |
| 1586 | BFD_ASSERT (elf_m68k_reloc_got_type (was) |
| 1587 | == elf_m68k_reloc_got_type (new_reloc)); |
| 1588 | |
| 1589 | was_size = elf_m68k_reloc_got_offset_size (was); |
| 1590 | } |
| 1591 | |
| 1592 | new_size = elf_m68k_reloc_got_offset_size (new_reloc); |
| 1593 | n_slots = elf_m68k_reloc_got_n_slots (new_reloc); |
| 1594 | |
| 1595 | while (was_size > new_size) |
| 1596 | { |
| 1597 | --was_size; |
| 1598 | got->n_slots[was_size] += n_slots; |
| 1599 | } |
| 1600 | |
| 1601 | if (new_reloc > was) |
| 1602 | /* Relocations are ordered from bigger got offset size to lesser, |
| 1603 | so choose the relocation type with lesser offset size. */ |
| 1604 | was = new_reloc; |
| 1605 | |
| 1606 | return was; |
| 1607 | } |
| 1608 | |
| 1609 | /* Update GOT counters when removing an entry of type TYPE. */ |
| 1610 | |
| 1611 | static void |
| 1612 | elf_m68k_remove_got_entry_type (struct elf_m68k_got *got, |
| 1613 | enum elf_m68k_reloc_type type) |
| 1614 | { |
| 1615 | enum elf_m68k_got_offset_size os; |
| 1616 | bfd_vma n_slots; |
| 1617 | |
| 1618 | n_slots = elf_m68k_reloc_got_n_slots (type); |
| 1619 | |
| 1620 | /* Decrese counter of slots with offset size corresponding to TYPE |
| 1621 | and all greater offset sizes. */ |
| 1622 | for (os = elf_m68k_reloc_got_offset_size (type); os <= R_32; ++os) |
| 1623 | { |
| 1624 | BFD_ASSERT (got->n_slots[os] >= n_slots); |
| 1625 | |
| 1626 | got->n_slots[os] -= n_slots; |
| 1627 | } |
| 1628 | } |
| 1629 | |
| 1630 | /* Add new or update existing entry to GOT. |
| 1631 | H, ABFD, TYPE and SYMNDX is data for the entry. |
| 1632 | INFO is a context where memory should be allocated. */ |
| 1633 | |
| 1634 | static struct elf_m68k_got_entry * |
| 1635 | elf_m68k_add_entry_to_got (struct elf_m68k_got *got, |
| 1636 | struct elf_link_hash_entry *h, |
| 1637 | const bfd *abfd, |
| 1638 | enum elf_m68k_reloc_type reloc_type, |
| 1639 | unsigned long symndx, |
| 1640 | struct bfd_link_info *info) |
| 1641 | { |
| 1642 | struct elf_m68k_got_entry_key key_; |
| 1643 | struct elf_m68k_got_entry *entry; |
| 1644 | |
| 1645 | if (h != NULL && elf_m68k_hash_entry (h)->got_entry_key == 0) |
| 1646 | elf_m68k_hash_entry (h)->got_entry_key |
| 1647 | = elf_m68k_multi_got (info)->global_symndx++; |
| 1648 | |
| 1649 | elf_m68k_init_got_entry_key (&key_, h, abfd, symndx, reloc_type); |
| 1650 | |
| 1651 | entry = elf_m68k_get_got_entry (got, &key_, FIND_OR_CREATE, info); |
| 1652 | if (entry == NULL) |
| 1653 | return NULL; |
| 1654 | |
| 1655 | /* Determine entry's type and update got->n_slots counters. */ |
| 1656 | entry->key_.type = elf_m68k_update_got_entry_type (got, |
| 1657 | entry->key_.type, |
| 1658 | reloc_type); |
| 1659 | |
| 1660 | /* Update refcount. */ |
| 1661 | ++entry->u.s1.refcount; |
| 1662 | |
| 1663 | if (entry->u.s1.refcount == 1) |
| 1664 | /* We see this entry for the first time. */ |
| 1665 | { |
| 1666 | if (entry->key_.bfd != NULL) |
| 1667 | got->local_n_slots += elf_m68k_reloc_got_n_slots (entry->key_.type); |
| 1668 | } |
| 1669 | |
| 1670 | BFD_ASSERT (got->n_slots[R_32] >= got->local_n_slots); |
| 1671 | |
| 1672 | if ((got->n_slots[R_8] |
| 1673 | > ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info)) |
| 1674 | || (got->n_slots[R_16] |
| 1675 | > ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT (info))) |
| 1676 | /* This BFD has too many relocation. */ |
| 1677 | { |
| 1678 | if (got->n_slots[R_8] > ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info)) |
| 1679 | (*_bfd_error_handler) (_("%B: GOT overflow: " |
| 1680 | "Number of relocations with 8-bit " |
| 1681 | "offset > %d"), |
| 1682 | abfd, |
| 1683 | ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info)); |
| 1684 | else |
| 1685 | (*_bfd_error_handler) (_("%B: GOT overflow: " |
| 1686 | "Number of relocations with 8- or 16-bit " |
| 1687 | "offset > %d"), |
| 1688 | abfd, |
| 1689 | ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT (info)); |
| 1690 | |
| 1691 | return NULL; |
| 1692 | } |
| 1693 | |
| 1694 | return entry; |
| 1695 | } |
| 1696 | |
| 1697 | /* Compute the hash value of the bfd in a bfd2got hash entry. */ |
| 1698 | |
| 1699 | static hashval_t |
| 1700 | elf_m68k_bfd2got_entry_hash (const void *entry) |
| 1701 | { |
| 1702 | const struct elf_m68k_bfd2got_entry *e; |
| 1703 | |
| 1704 | e = (const struct elf_m68k_bfd2got_entry *) entry; |
| 1705 | |
| 1706 | return e->bfd->id; |
| 1707 | } |
| 1708 | |
| 1709 | /* Check whether two hash entries have the same bfd. */ |
| 1710 | |
| 1711 | static int |
| 1712 | elf_m68k_bfd2got_entry_eq (const void *entry1, const void *entry2) |
| 1713 | { |
| 1714 | const struct elf_m68k_bfd2got_entry *e1; |
| 1715 | const struct elf_m68k_bfd2got_entry *e2; |
| 1716 | |
| 1717 | e1 = (const struct elf_m68k_bfd2got_entry *) entry1; |
| 1718 | e2 = (const struct elf_m68k_bfd2got_entry *) entry2; |
| 1719 | |
| 1720 | return e1->bfd == e2->bfd; |
| 1721 | } |
| 1722 | |
| 1723 | /* Destruct a bfd2got entry. */ |
| 1724 | |
| 1725 | static void |
| 1726 | elf_m68k_bfd2got_entry_del (void *_entry) |
| 1727 | { |
| 1728 | struct elf_m68k_bfd2got_entry *entry; |
| 1729 | |
| 1730 | entry = (struct elf_m68k_bfd2got_entry *) _entry; |
| 1731 | |
| 1732 | BFD_ASSERT (entry->got != NULL); |
| 1733 | elf_m68k_clear_got (entry->got); |
| 1734 | } |
| 1735 | |
| 1736 | /* Find existing or create new (depending on HOWTO) bfd2got entry in |
| 1737 | MULTI_GOT. ABFD is the bfd we need a GOT for. INFO is a context where |
| 1738 | memory should be allocated. */ |
| 1739 | |
| 1740 | static struct elf_m68k_bfd2got_entry * |
| 1741 | elf_m68k_get_bfd2got_entry (struct elf_m68k_multi_got *multi_got, |
| 1742 | const bfd *abfd, |
| 1743 | enum elf_m68k_get_entry_howto howto, |
| 1744 | struct bfd_link_info *info) |
| 1745 | { |
| 1746 | struct elf_m68k_bfd2got_entry entry_; |
| 1747 | void **ptr; |
| 1748 | struct elf_m68k_bfd2got_entry *entry; |
| 1749 | |
| 1750 | BFD_ASSERT ((info == NULL) == (howto == SEARCH || howto == MUST_FIND)); |
| 1751 | |
| 1752 | if (multi_got->bfd2got == NULL) |
| 1753 | /* This is the first GOT. Initialize bfd2got. */ |
| 1754 | { |
| 1755 | if (howto == SEARCH) |
| 1756 | return NULL; |
| 1757 | |
| 1758 | multi_got->bfd2got = htab_try_create (1, elf_m68k_bfd2got_entry_hash, |
| 1759 | elf_m68k_bfd2got_entry_eq, |
| 1760 | elf_m68k_bfd2got_entry_del); |
| 1761 | if (multi_got->bfd2got == NULL) |
| 1762 | { |
| 1763 | bfd_set_error (bfd_error_no_memory); |
| 1764 | return NULL; |
| 1765 | } |
| 1766 | } |
| 1767 | |
| 1768 | entry_.bfd = abfd; |
| 1769 | ptr = htab_find_slot (multi_got->bfd2got, &entry_, (howto != SEARCH |
| 1770 | ? INSERT : NO_INSERT)); |
| 1771 | if (ptr == NULL) |
| 1772 | { |
| 1773 | if (howto == SEARCH) |
| 1774 | /* Entry not found. */ |
| 1775 | return NULL; |
| 1776 | |
| 1777 | /* We're out of memory. */ |
| 1778 | bfd_set_error (bfd_error_no_memory); |
| 1779 | return NULL; |
| 1780 | } |
| 1781 | |
| 1782 | if (*ptr == NULL) |
| 1783 | /* Entry was not found. Create new one. */ |
| 1784 | { |
| 1785 | BFD_ASSERT (howto != MUST_FIND && howto != SEARCH); |
| 1786 | |
| 1787 | entry = ((struct elf_m68k_bfd2got_entry *) |
| 1788 | bfd_alloc (elf_hash_table (info)->dynobj, sizeof (*entry))); |
| 1789 | if (entry == NULL) |
| 1790 | return NULL; |
| 1791 | |
| 1792 | entry->bfd = abfd; |
| 1793 | |
| 1794 | entry->got = elf_m68k_create_empty_got (info); |
| 1795 | if (entry->got == NULL) |
| 1796 | return NULL; |
| 1797 | |
| 1798 | *ptr = entry; |
| 1799 | } |
| 1800 | else |
| 1801 | { |
| 1802 | BFD_ASSERT (howto != MUST_CREATE); |
| 1803 | |
| 1804 | /* Return existing entry. */ |
| 1805 | entry = *ptr; |
| 1806 | } |
| 1807 | |
| 1808 | return entry; |
| 1809 | } |
| 1810 | |
| 1811 | struct elf_m68k_can_merge_gots_arg |
| 1812 | { |
| 1813 | /* A current_got that we constructing a DIFF against. */ |
| 1814 | struct elf_m68k_got *big; |
| 1815 | |
| 1816 | /* GOT holding entries not present or that should be changed in |
| 1817 | BIG. */ |
| 1818 | struct elf_m68k_got *diff; |
| 1819 | |
| 1820 | /* Context where to allocate memory. */ |
| 1821 | struct bfd_link_info *info; |
| 1822 | |
| 1823 | /* Error flag. */ |
| 1824 | bfd_boolean error_p; |
| 1825 | }; |
| 1826 | |
| 1827 | /* Process a single entry from the small GOT to see if it should be added |
| 1828 | or updated in the big GOT. */ |
| 1829 | |
| 1830 | static int |
| 1831 | elf_m68k_can_merge_gots_1 (void **_entry_ptr, void *_arg) |
| 1832 | { |
| 1833 | const struct elf_m68k_got_entry *entry1; |
| 1834 | struct elf_m68k_can_merge_gots_arg *arg; |
| 1835 | const struct elf_m68k_got_entry *entry2; |
| 1836 | enum elf_m68k_reloc_type type; |
| 1837 | |
| 1838 | entry1 = (const struct elf_m68k_got_entry *) *_entry_ptr; |
| 1839 | arg = (struct elf_m68k_can_merge_gots_arg *) _arg; |
| 1840 | |
| 1841 | entry2 = elf_m68k_get_got_entry (arg->big, &entry1->key_, SEARCH, NULL); |
| 1842 | |
| 1843 | if (entry2 != NULL) |
| 1844 | /* We found an existing entry. Check if we should update it. */ |
| 1845 | { |
| 1846 | type = elf_m68k_update_got_entry_type (arg->diff, |
| 1847 | entry2->key_.type, |
| 1848 | entry1->key_.type); |
| 1849 | |
| 1850 | if (type == entry2->key_.type) |
| 1851 | /* ENTRY1 doesn't update data in ENTRY2. Skip it. |
| 1852 | To skip creation of difference entry we use the type, |
| 1853 | which we won't see in GOT entries for sure. */ |
| 1854 | type = R_68K_max; |
| 1855 | } |
| 1856 | else |
| 1857 | /* We didn't find the entry. Add entry1 to DIFF. */ |
| 1858 | { |
| 1859 | BFD_ASSERT (entry1->key_.type != R_68K_max); |
| 1860 | |
| 1861 | type = elf_m68k_update_got_entry_type (arg->diff, |
| 1862 | R_68K_max, entry1->key_.type); |
| 1863 | |
| 1864 | if (entry1->key_.bfd != NULL) |
| 1865 | arg->diff->local_n_slots += elf_m68k_reloc_got_n_slots (type); |
| 1866 | } |
| 1867 | |
| 1868 | if (type != R_68K_max) |
| 1869 | /* Create an entry in DIFF. */ |
| 1870 | { |
| 1871 | struct elf_m68k_got_entry *entry; |
| 1872 | |
| 1873 | entry = elf_m68k_get_got_entry (arg->diff, &entry1->key_, MUST_CREATE, |
| 1874 | arg->info); |
| 1875 | if (entry == NULL) |
| 1876 | { |
| 1877 | arg->error_p = TRUE; |
| 1878 | return 0; |
| 1879 | } |
| 1880 | |
| 1881 | entry->key_.type = type; |
| 1882 | } |
| 1883 | |
| 1884 | return 1; |
| 1885 | } |
| 1886 | |
| 1887 | /* Return TRUE if SMALL GOT can be added to BIG GOT without overflowing it. |
| 1888 | Construct DIFF GOT holding the entries which should be added or updated |
| 1889 | in BIG GOT to accumulate information from SMALL. |
| 1890 | INFO is the context where memory should be allocated. */ |
| 1891 | |
| 1892 | static bfd_boolean |
| 1893 | elf_m68k_can_merge_gots (struct elf_m68k_got *big, |
| 1894 | const struct elf_m68k_got *small, |
| 1895 | struct bfd_link_info *info, |
| 1896 | struct elf_m68k_got *diff) |
| 1897 | { |
| 1898 | struct elf_m68k_can_merge_gots_arg arg_; |
| 1899 | |
| 1900 | BFD_ASSERT (small->offset == (bfd_vma) -1); |
| 1901 | |
| 1902 | arg_.big = big; |
| 1903 | arg_.diff = diff; |
| 1904 | arg_.info = info; |
| 1905 | arg_.error_p = FALSE; |
| 1906 | htab_traverse_noresize (small->entries, elf_m68k_can_merge_gots_1, &arg_); |
| 1907 | if (arg_.error_p) |
| 1908 | { |
| 1909 | diff->offset = 0; |
| 1910 | return FALSE; |
| 1911 | } |
| 1912 | |
| 1913 | /* Check for overflow. */ |
| 1914 | if ((big->n_slots[R_8] + arg_.diff->n_slots[R_8] |
| 1915 | > ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info)) |
| 1916 | || (big->n_slots[R_16] + arg_.diff->n_slots[R_16] |
| 1917 | > ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT (info))) |
| 1918 | return FALSE; |
| 1919 | |
| 1920 | return TRUE; |
| 1921 | } |
| 1922 | |
| 1923 | struct elf_m68k_merge_gots_arg |
| 1924 | { |
| 1925 | /* The BIG got. */ |
| 1926 | struct elf_m68k_got *big; |
| 1927 | |
| 1928 | /* Context where memory should be allocated. */ |
| 1929 | struct bfd_link_info *info; |
| 1930 | |
| 1931 | /* Error flag. */ |
| 1932 | bfd_boolean error_p; |
| 1933 | }; |
| 1934 | |
| 1935 | /* Process a single entry from DIFF got. Add or update corresponding |
| 1936 | entry in the BIG got. */ |
| 1937 | |
| 1938 | static int |
| 1939 | elf_m68k_merge_gots_1 (void **entry_ptr, void *_arg) |
| 1940 | { |
| 1941 | const struct elf_m68k_got_entry *from; |
| 1942 | struct elf_m68k_merge_gots_arg *arg; |
| 1943 | struct elf_m68k_got_entry *to; |
| 1944 | |
| 1945 | from = (const struct elf_m68k_got_entry *) *entry_ptr; |
| 1946 | arg = (struct elf_m68k_merge_gots_arg *) _arg; |
| 1947 | |
| 1948 | to = elf_m68k_get_got_entry (arg->big, &from->key_, FIND_OR_CREATE, |
| 1949 | arg->info); |
| 1950 | if (to == NULL) |
| 1951 | { |
| 1952 | arg->error_p = TRUE; |
| 1953 | return 0; |
| 1954 | } |
| 1955 | |
| 1956 | BFD_ASSERT (to->u.s1.refcount == 0); |
| 1957 | /* All we need to merge is TYPE. */ |
| 1958 | to->key_.type = from->key_.type; |
| 1959 | |
| 1960 | return 1; |
| 1961 | } |
| 1962 | |
| 1963 | /* Merge data from DIFF to BIG. INFO is context where memory should be |
| 1964 | allocated. */ |
| 1965 | |
| 1966 | static bfd_boolean |
| 1967 | elf_m68k_merge_gots (struct elf_m68k_got *big, |
| 1968 | struct elf_m68k_got *diff, |
| 1969 | struct bfd_link_info *info) |
| 1970 | { |
| 1971 | if (diff->entries != NULL) |
| 1972 | /* DIFF is not empty. Merge it into BIG GOT. */ |
| 1973 | { |
| 1974 | struct elf_m68k_merge_gots_arg arg_; |
| 1975 | |
| 1976 | /* Merge entries. */ |
| 1977 | arg_.big = big; |
| 1978 | arg_.info = info; |
| 1979 | arg_.error_p = FALSE; |
| 1980 | htab_traverse_noresize (diff->entries, elf_m68k_merge_gots_1, &arg_); |
| 1981 | if (arg_.error_p) |
| 1982 | return FALSE; |
| 1983 | |
| 1984 | /* Merge counters. */ |
| 1985 | big->n_slots[R_8] += diff->n_slots[R_8]; |
| 1986 | big->n_slots[R_16] += diff->n_slots[R_16]; |
| 1987 | big->n_slots[R_32] += diff->n_slots[R_32]; |
| 1988 | big->local_n_slots += diff->local_n_slots; |
| 1989 | } |
| 1990 | else |
| 1991 | /* DIFF is empty. */ |
| 1992 | { |
| 1993 | BFD_ASSERT (diff->n_slots[R_8] == 0); |
| 1994 | BFD_ASSERT (diff->n_slots[R_16] == 0); |
| 1995 | BFD_ASSERT (diff->n_slots[R_32] == 0); |
| 1996 | BFD_ASSERT (diff->local_n_slots == 0); |
| 1997 | } |
| 1998 | |
| 1999 | BFD_ASSERT (!elf_m68k_hash_table (info)->allow_multigot_p |
| 2000 | || ((big->n_slots[R_8] |
| 2001 | <= ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info)) |
| 2002 | && (big->n_slots[R_16] |
| 2003 | <= ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT (info)))); |
| 2004 | |
| 2005 | return TRUE; |
| 2006 | } |
| 2007 | |
| 2008 | struct elf_m68k_finalize_got_offsets_arg |
| 2009 | { |
| 2010 | /* Ranges of the offsets for GOT entries. |
| 2011 | R_x entries receive offsets between offset1[R_x] and offset2[R_x]. |
| 2012 | R_x is R_8, R_16 and R_32. */ |
| 2013 | bfd_vma *offset1; |
| 2014 | bfd_vma *offset2; |
| 2015 | |
| 2016 | /* Mapping from global symndx to global symbols. |
| 2017 | This is used to build lists of got entries for global symbols. */ |
| 2018 | struct elf_m68k_link_hash_entry **symndx2h; |
| 2019 | |
| 2020 | bfd_vma n_ldm_entries; |
| 2021 | }; |
| 2022 | |
| 2023 | /* Assign ENTRY an offset. Build list of GOT entries for global symbols |
| 2024 | along the way. */ |
| 2025 | |
| 2026 | static int |
| 2027 | elf_m68k_finalize_got_offsets_1 (void **entry_ptr, void *_arg) |
| 2028 | { |
| 2029 | struct elf_m68k_got_entry *entry; |
| 2030 | struct elf_m68k_finalize_got_offsets_arg *arg; |
| 2031 | |
| 2032 | enum elf_m68k_got_offset_size got_offset_size; |
| 2033 | bfd_vma entry_size; |
| 2034 | |
| 2035 | entry = (struct elf_m68k_got_entry *) *entry_ptr; |
| 2036 | arg = (struct elf_m68k_finalize_got_offsets_arg *) _arg; |
| 2037 | |
| 2038 | /* This should be a fresh entry created in elf_m68k_can_merge_gots. */ |
| 2039 | BFD_ASSERT (entry->u.s1.refcount == 0); |
| 2040 | |
| 2041 | /* Get GOT offset size for the entry . */ |
| 2042 | got_offset_size = elf_m68k_reloc_got_offset_size (entry->key_.type); |
| 2043 | |
| 2044 | /* Calculate entry size in bytes. */ |
| 2045 | entry_size = 4 * elf_m68k_reloc_got_n_slots (entry->key_.type); |
| 2046 | |
| 2047 | /* Check if we should switch to negative range of the offsets. */ |
| 2048 | if (arg->offset1[got_offset_size] + entry_size |
| 2049 | > arg->offset2[got_offset_size]) |
| 2050 | { |
| 2051 | /* Verify that this is the only switch to negative range for |
| 2052 | got_offset_size. If this assertion fails, then we've miscalculated |
| 2053 | range for got_offset_size entries in |
| 2054 | elf_m68k_finalize_got_offsets. */ |
| 2055 | BFD_ASSERT (arg->offset2[got_offset_size] |
| 2056 | != arg->offset2[-(int) got_offset_size - 1]); |
| 2057 | |
| 2058 | /* Switch. */ |
| 2059 | arg->offset1[got_offset_size] = arg->offset1[-(int) got_offset_size - 1]; |
| 2060 | arg->offset2[got_offset_size] = arg->offset2[-(int) got_offset_size - 1]; |
| 2061 | |
| 2062 | /* Verify that now we have enough room for the entry. */ |
| 2063 | BFD_ASSERT (arg->offset1[got_offset_size] + entry_size |
| 2064 | <= arg->offset2[got_offset_size]); |
| 2065 | } |
| 2066 | |
| 2067 | /* Assign offset to entry. */ |
| 2068 | entry->u.s2.offset = arg->offset1[got_offset_size]; |
| 2069 | arg->offset1[got_offset_size] += entry_size; |
| 2070 | |
| 2071 | if (entry->key_.bfd == NULL) |
| 2072 | /* Hook up this entry into the list of got_entries of H. */ |
| 2073 | { |
| 2074 | struct elf_m68k_link_hash_entry *h; |
| 2075 | |
| 2076 | h = arg->symndx2h[entry->key_.symndx]; |
| 2077 | if (h != NULL) |
| 2078 | { |
| 2079 | entry->u.s2.next = h->glist; |
| 2080 | h->glist = entry; |
| 2081 | } |
| 2082 | else |
| 2083 | /* This should be the entry for TLS_LDM relocation then. */ |
| 2084 | { |
| 2085 | BFD_ASSERT ((elf_m68k_reloc_got_type (entry->key_.type) |
| 2086 | == R_68K_TLS_LDM32) |
| 2087 | && entry->key_.symndx == 0); |
| 2088 | |
| 2089 | ++arg->n_ldm_entries; |
| 2090 | } |
| 2091 | } |
| 2092 | else |
| 2093 | /* This entry is for local symbol. */ |
| 2094 | entry->u.s2.next = NULL; |
| 2095 | |
| 2096 | return 1; |
| 2097 | } |
| 2098 | |
| 2099 | /* Assign offsets within GOT. USE_NEG_GOT_OFFSETS_P indicates if we |
| 2100 | should use negative offsets. |
| 2101 | Build list of GOT entries for global symbols along the way. |
| 2102 | SYMNDX2H is mapping from global symbol indices to actual |
| 2103 | global symbols. |
| 2104 | Return offset at which next GOT should start. */ |
| 2105 | |
| 2106 | static void |
| 2107 | elf_m68k_finalize_got_offsets (struct elf_m68k_got *got, |
| 2108 | bfd_boolean use_neg_got_offsets_p, |
| 2109 | struct elf_m68k_link_hash_entry **symndx2h, |
| 2110 | bfd_vma *final_offset, bfd_vma *n_ldm_entries) |
| 2111 | { |
| 2112 | struct elf_m68k_finalize_got_offsets_arg arg_; |
| 2113 | bfd_vma offset1_[2 * R_LAST]; |
| 2114 | bfd_vma offset2_[2 * R_LAST]; |
| 2115 | int i; |
| 2116 | bfd_vma start_offset; |
| 2117 | |
| 2118 | BFD_ASSERT (got->offset != (bfd_vma) -1); |
| 2119 | |
| 2120 | /* We set entry offsets relative to the .got section (and not the |
| 2121 | start of a particular GOT), so that we can use them in |
| 2122 | finish_dynamic_symbol without needing to know the GOT which they come |
| 2123 | from. */ |
| 2124 | |
| 2125 | /* Put offset1 in the middle of offset1_, same for offset2. */ |
| 2126 | arg_.offset1 = offset1_ + R_LAST; |
| 2127 | arg_.offset2 = offset2_ + R_LAST; |
| 2128 | |
| 2129 | start_offset = got->offset; |
| 2130 | |
| 2131 | if (use_neg_got_offsets_p) |
| 2132 | /* Setup both negative and positive ranges for R_8, R_16 and R_32. */ |
| 2133 | i = -(int) R_32 - 1; |
| 2134 | else |
| 2135 | /* Setup positives ranges for R_8, R_16 and R_32. */ |
| 2136 | i = (int) R_8; |
| 2137 | |
| 2138 | for (; i <= (int) R_32; ++i) |
| 2139 | { |
| 2140 | int j; |
| 2141 | size_t n; |
| 2142 | |
| 2143 | /* Set beginning of the range of offsets I. */ |
| 2144 | arg_.offset1[i] = start_offset; |
| 2145 | |
| 2146 | /* Calculate number of slots that require I offsets. */ |
| 2147 | j = (i >= 0) ? i : -i - 1; |
| 2148 | n = (j >= 1) ? got->n_slots[j - 1] : 0; |
| 2149 | n = got->n_slots[j] - n; |
| 2150 | |
| 2151 | if (use_neg_got_offsets_p && n != 0) |
| 2152 | { |
| 2153 | if (i < 0) |
| 2154 | /* We first fill the positive side of the range, so we might |
| 2155 | end up with one empty slot at that side when we can't fit |
| 2156 | whole 2-slot entry. Account for that at negative side of |
| 2157 | the interval with one additional entry. */ |
| 2158 | n = n / 2 + 1; |
| 2159 | else |
| 2160 | /* When the number of slots is odd, make positive side of the |
| 2161 | range one entry bigger. */ |
| 2162 | n = (n + 1) / 2; |
| 2163 | } |
| 2164 | |
| 2165 | /* N is the number of slots that require I offsets. |
| 2166 | Calculate length of the range for I offsets. */ |
| 2167 | n = 4 * n; |
| 2168 | |
| 2169 | /* Set end of the range. */ |
| 2170 | arg_.offset2[i] = start_offset + n; |
| 2171 | |
| 2172 | start_offset = arg_.offset2[i]; |
| 2173 | } |
| 2174 | |
| 2175 | if (!use_neg_got_offsets_p) |
| 2176 | /* Make sure that if we try to switch to negative offsets in |
| 2177 | elf_m68k_finalize_got_offsets_1, the assert therein will catch |
| 2178 | the bug. */ |
| 2179 | for (i = R_8; i <= R_32; ++i) |
| 2180 | arg_.offset2[-i - 1] = arg_.offset2[i]; |
| 2181 | |
| 2182 | /* Setup got->offset. offset1[R_8] is either in the middle or at the |
| 2183 | beginning of GOT depending on use_neg_got_offsets_p. */ |
| 2184 | got->offset = arg_.offset1[R_8]; |
| 2185 | |
| 2186 | arg_.symndx2h = symndx2h; |
| 2187 | arg_.n_ldm_entries = 0; |
| 2188 | |
| 2189 | /* Assign offsets. */ |
| 2190 | htab_traverse (got->entries, elf_m68k_finalize_got_offsets_1, &arg_); |
| 2191 | |
| 2192 | /* Check offset ranges we have actually assigned. */ |
| 2193 | for (i = (int) R_8; i <= (int) R_32; ++i) |
| 2194 | BFD_ASSERT (arg_.offset2[i] - arg_.offset1[i] <= 4); |
| 2195 | |
| 2196 | *final_offset = start_offset; |
| 2197 | *n_ldm_entries = arg_.n_ldm_entries; |
| 2198 | } |
| 2199 | |
| 2200 | struct elf_m68k_partition_multi_got_arg |
| 2201 | { |
| 2202 | /* The GOT we are adding entries to. Aka big got. */ |
| 2203 | struct elf_m68k_got *current_got; |
| 2204 | |
| 2205 | /* Offset to assign the next CURRENT_GOT. */ |
| 2206 | bfd_vma offset; |
| 2207 | |
| 2208 | /* Context where memory should be allocated. */ |
| 2209 | struct bfd_link_info *info; |
| 2210 | |
| 2211 | /* Total number of slots in the .got section. |
| 2212 | This is used to calculate size of the .got and .rela.got sections. */ |
| 2213 | bfd_vma n_slots; |
| 2214 | |
| 2215 | /* Difference in numbers of allocated slots in the .got section |
| 2216 | and necessary relocations in the .rela.got section. |
| 2217 | This is used to calculate size of the .rela.got section. */ |
| 2218 | bfd_vma slots_relas_diff; |
| 2219 | |
| 2220 | /* Error flag. */ |
| 2221 | bfd_boolean error_p; |
| 2222 | |
| 2223 | /* Mapping from global symndx to global symbols. |
| 2224 | This is used to build lists of got entries for global symbols. */ |
| 2225 | struct elf_m68k_link_hash_entry **symndx2h; |
| 2226 | }; |
| 2227 | |
| 2228 | static void |
| 2229 | elf_m68k_partition_multi_got_2 (struct elf_m68k_partition_multi_got_arg *arg) |
| 2230 | { |
| 2231 | bfd_vma n_ldm_entries; |
| 2232 | |
| 2233 | elf_m68k_finalize_got_offsets (arg->current_got, |
| 2234 | (elf_m68k_hash_table (arg->info) |
| 2235 | ->use_neg_got_offsets_p), |
| 2236 | arg->symndx2h, |
| 2237 | &arg->offset, &n_ldm_entries); |
| 2238 | |
| 2239 | arg->n_slots += arg->current_got->n_slots[R_32]; |
| 2240 | |
| 2241 | if (!arg->info->shared) |
| 2242 | /* If we are generating a shared object, we need to |
| 2243 | output a R_68K_RELATIVE reloc so that the dynamic |
| 2244 | linker can adjust this GOT entry. Overwise we |
| 2245 | don't need space in .rela.got for local symbols. */ |
| 2246 | arg->slots_relas_diff += arg->current_got->local_n_slots; |
| 2247 | |
| 2248 | /* @LDM relocations require a 2-slot GOT entry, but only |
| 2249 | one relocation. Account for that. */ |
| 2250 | arg->slots_relas_diff += n_ldm_entries; |
| 2251 | |
| 2252 | BFD_ASSERT (arg->slots_relas_diff <= arg->n_slots); |
| 2253 | } |
| 2254 | |
| 2255 | |
| 2256 | /* Process a single BFD2GOT entry and either merge GOT to CURRENT_GOT |
| 2257 | or start a new CURRENT_GOT. */ |
| 2258 | |
| 2259 | static int |
| 2260 | elf_m68k_partition_multi_got_1 (void **_entry, void *_arg) |
| 2261 | { |
| 2262 | struct elf_m68k_bfd2got_entry *entry; |
| 2263 | struct elf_m68k_partition_multi_got_arg *arg; |
| 2264 | struct elf_m68k_got *got; |
| 2265 | struct elf_m68k_got diff_; |
| 2266 | struct elf_m68k_got *diff; |
| 2267 | |
| 2268 | entry = (struct elf_m68k_bfd2got_entry *) *_entry; |
| 2269 | arg = (struct elf_m68k_partition_multi_got_arg *) _arg; |
| 2270 | |
| 2271 | got = entry->got; |
| 2272 | BFD_ASSERT (got != NULL); |
| 2273 | BFD_ASSERT (got->offset == (bfd_vma) -1); |
| 2274 | |
| 2275 | diff = NULL; |
| 2276 | |
| 2277 | if (arg->current_got != NULL) |
| 2278 | /* Construct diff. */ |
| 2279 | { |
| 2280 | diff = &diff_; |
| 2281 | elf_m68k_init_got (diff); |
| 2282 | |
| 2283 | if (!elf_m68k_can_merge_gots (arg->current_got, got, arg->info, diff)) |
| 2284 | { |
| 2285 | if (diff->offset == 0) |
| 2286 | /* Offset set to 0 in the diff_ indicates an error. */ |
| 2287 | { |
| 2288 | arg->error_p = TRUE; |
| 2289 | goto final_return; |
| 2290 | } |
| 2291 | |
| 2292 | if (elf_m68k_hash_table (arg->info)->allow_multigot_p) |
| 2293 | { |
| 2294 | elf_m68k_clear_got (diff); |
| 2295 | /* Schedule to finish up current_got and start new one. */ |
| 2296 | diff = NULL; |
| 2297 | } |
| 2298 | /* else |
| 2299 | Merge GOTs no matter what. If big GOT overflows, |
| 2300 | we'll fail in relocate_section due to truncated relocations. |
| 2301 | |
| 2302 | ??? May be fail earlier? E.g., in can_merge_gots. */ |
| 2303 | } |
| 2304 | } |
| 2305 | else |
| 2306 | /* Diff of got against empty current_got is got itself. */ |
| 2307 | { |
| 2308 | /* Create empty current_got to put subsequent GOTs to. */ |
| 2309 | arg->current_got = elf_m68k_create_empty_got (arg->info); |
| 2310 | if (arg->current_got == NULL) |
| 2311 | { |
| 2312 | arg->error_p = TRUE; |
| 2313 | goto final_return; |
| 2314 | } |
| 2315 | |
| 2316 | arg->current_got->offset = arg->offset; |
| 2317 | |
| 2318 | diff = got; |
| 2319 | } |
| 2320 | |
| 2321 | if (diff != NULL) |
| 2322 | { |
| 2323 | if (!elf_m68k_merge_gots (arg->current_got, diff, arg->info)) |
| 2324 | { |
| 2325 | arg->error_p = TRUE; |
| 2326 | goto final_return; |
| 2327 | } |
| 2328 | |
| 2329 | /* Now we can free GOT. */ |
| 2330 | elf_m68k_clear_got (got); |
| 2331 | |
| 2332 | entry->got = arg->current_got; |
| 2333 | } |
| 2334 | else |
| 2335 | { |
| 2336 | /* Finish up current_got. */ |
| 2337 | elf_m68k_partition_multi_got_2 (arg); |
| 2338 | |
| 2339 | /* Schedule to start a new current_got. */ |
| 2340 | arg->current_got = NULL; |
| 2341 | |
| 2342 | /* Retry. */ |
| 2343 | if (!elf_m68k_partition_multi_got_1 (_entry, _arg)) |
| 2344 | { |
| 2345 | BFD_ASSERT (arg->error_p); |
| 2346 | goto final_return; |
| 2347 | } |
| 2348 | } |
| 2349 | |
| 2350 | final_return: |
| 2351 | if (diff != NULL) |
| 2352 | elf_m68k_clear_got (diff); |
| 2353 | |
| 2354 | return arg->error_p == FALSE ? 1 : 0; |
| 2355 | } |
| 2356 | |
| 2357 | /* Helper function to build symndx2h mapping. */ |
| 2358 | |
| 2359 | static bfd_boolean |
| 2360 | elf_m68k_init_symndx2h_1 (struct elf_link_hash_entry *_h, |
| 2361 | void *_arg) |
| 2362 | { |
| 2363 | struct elf_m68k_link_hash_entry *h; |
| 2364 | |
| 2365 | h = elf_m68k_hash_entry (_h); |
| 2366 | |
| 2367 | if (h->got_entry_key != 0) |
| 2368 | /* H has at least one entry in the GOT. */ |
| 2369 | { |
| 2370 | struct elf_m68k_partition_multi_got_arg *arg; |
| 2371 | |
| 2372 | arg = (struct elf_m68k_partition_multi_got_arg *) _arg; |
| 2373 | |
| 2374 | BFD_ASSERT (arg->symndx2h[h->got_entry_key] == NULL); |
| 2375 | arg->symndx2h[h->got_entry_key] = h; |
| 2376 | } |
| 2377 | |
| 2378 | return TRUE; |
| 2379 | } |
| 2380 | |
| 2381 | /* Merge GOTs of some BFDs, assign offsets to GOT entries and build |
| 2382 | lists of GOT entries for global symbols. |
| 2383 | Calculate sizes of .got and .rela.got sections. */ |
| 2384 | |
| 2385 | static bfd_boolean |
| 2386 | elf_m68k_partition_multi_got (struct bfd_link_info *info) |
| 2387 | { |
| 2388 | struct elf_m68k_multi_got *multi_got; |
| 2389 | struct elf_m68k_partition_multi_got_arg arg_; |
| 2390 | |
| 2391 | multi_got = elf_m68k_multi_got (info); |
| 2392 | |
| 2393 | arg_.current_got = NULL; |
| 2394 | arg_.offset = 0; |
| 2395 | arg_.info = info; |
| 2396 | arg_.n_slots = 0; |
| 2397 | arg_.slots_relas_diff = 0; |
| 2398 | arg_.error_p = FALSE; |
| 2399 | |
| 2400 | if (multi_got->bfd2got != NULL) |
| 2401 | { |
| 2402 | /* Initialize symndx2h mapping. */ |
| 2403 | { |
| 2404 | arg_.symndx2h = bfd_zmalloc (multi_got->global_symndx |
| 2405 | * sizeof (*arg_.symndx2h)); |
| 2406 | if (arg_.symndx2h == NULL) |
| 2407 | return FALSE; |
| 2408 | |
| 2409 | elf_link_hash_traverse (elf_hash_table (info), |
| 2410 | elf_m68k_init_symndx2h_1, &arg_); |
| 2411 | } |
| 2412 | |
| 2413 | /* Partition. */ |
| 2414 | htab_traverse (multi_got->bfd2got, elf_m68k_partition_multi_got_1, |
| 2415 | &arg_); |
| 2416 | if (arg_.error_p) |
| 2417 | { |
| 2418 | free (arg_.symndx2h); |
| 2419 | arg_.symndx2h = NULL; |
| 2420 | |
| 2421 | return FALSE; |
| 2422 | } |
| 2423 | |
| 2424 | /* Finish up last current_got. */ |
| 2425 | elf_m68k_partition_multi_got_2 (&arg_); |
| 2426 | |
| 2427 | free (arg_.symndx2h); |
| 2428 | } |
| 2429 | |
| 2430 | if (elf_hash_table (info)->dynobj != NULL) |
| 2431 | /* Set sizes of .got and .rela.got sections. */ |
| 2432 | { |
| 2433 | asection *s; |
| 2434 | |
| 2435 | s = bfd_get_linker_section (elf_hash_table (info)->dynobj, ".got"); |
| 2436 | if (s != NULL) |
| 2437 | s->size = arg_.offset; |
| 2438 | else |
| 2439 | BFD_ASSERT (arg_.offset == 0); |
| 2440 | |
| 2441 | BFD_ASSERT (arg_.slots_relas_diff <= arg_.n_slots); |
| 2442 | arg_.n_slots -= arg_.slots_relas_diff; |
| 2443 | |
| 2444 | s = bfd_get_linker_section (elf_hash_table (info)->dynobj, ".rela.got"); |
| 2445 | if (s != NULL) |
| 2446 | s->size = arg_.n_slots * sizeof (Elf32_External_Rela); |
| 2447 | else |
| 2448 | BFD_ASSERT (arg_.n_slots == 0); |
| 2449 | } |
| 2450 | else |
| 2451 | BFD_ASSERT (multi_got->bfd2got == NULL); |
| 2452 | |
| 2453 | return TRUE; |
| 2454 | } |
| 2455 | |
| 2456 | /* Specialized version of elf_m68k_get_got_entry that returns pointer |
| 2457 | to hashtable slot, thus allowing removal of entry via |
| 2458 | elf_m68k_remove_got_entry. */ |
| 2459 | |
| 2460 | static struct elf_m68k_got_entry ** |
| 2461 | elf_m68k_find_got_entry_ptr (struct elf_m68k_got *got, |
| 2462 | struct elf_m68k_got_entry_key *key) |
| 2463 | { |
| 2464 | void **ptr; |
| 2465 | struct elf_m68k_got_entry entry_; |
| 2466 | struct elf_m68k_got_entry **entry_ptr; |
| 2467 | |
| 2468 | entry_.key_ = *key; |
| 2469 | ptr = htab_find_slot (got->entries, &entry_, NO_INSERT); |
| 2470 | BFD_ASSERT (ptr != NULL); |
| 2471 | |
| 2472 | entry_ptr = (struct elf_m68k_got_entry **) ptr; |
| 2473 | |
| 2474 | return entry_ptr; |
| 2475 | } |
| 2476 | |
| 2477 | /* Remove entry pointed to by ENTRY_PTR from GOT. */ |
| 2478 | |
| 2479 | static void |
| 2480 | elf_m68k_remove_got_entry (struct elf_m68k_got *got, |
| 2481 | struct elf_m68k_got_entry **entry_ptr) |
| 2482 | { |
| 2483 | struct elf_m68k_got_entry *entry; |
| 2484 | |
| 2485 | entry = *entry_ptr; |
| 2486 | |
| 2487 | /* Check that offsets have not been finalized yet. */ |
| 2488 | BFD_ASSERT (got->offset == (bfd_vma) -1); |
| 2489 | /* Check that this entry is indeed unused. */ |
| 2490 | BFD_ASSERT (entry->u.s1.refcount == 0); |
| 2491 | |
| 2492 | elf_m68k_remove_got_entry_type (got, entry->key_.type); |
| 2493 | |
| 2494 | if (entry->key_.bfd != NULL) |
| 2495 | got->local_n_slots -= elf_m68k_reloc_got_n_slots (entry->key_.type); |
| 2496 | |
| 2497 | BFD_ASSERT (got->n_slots[R_32] >= got->local_n_slots); |
| 2498 | |
| 2499 | htab_clear_slot (got->entries, (void **) entry_ptr); |
| 2500 | } |
| 2501 | |
| 2502 | /* Copy any information related to dynamic linking from a pre-existing |
| 2503 | symbol to a newly created symbol. Also called to copy flags and |
| 2504 | other back-end info to a weakdef, in which case the symbol is not |
| 2505 | newly created and plt/got refcounts and dynamic indices should not |
| 2506 | be copied. */ |
| 2507 | |
| 2508 | static void |
| 2509 | elf_m68k_copy_indirect_symbol (struct bfd_link_info *info, |
| 2510 | struct elf_link_hash_entry *_dir, |
| 2511 | struct elf_link_hash_entry *_ind) |
| 2512 | { |
| 2513 | struct elf_m68k_link_hash_entry *dir; |
| 2514 | struct elf_m68k_link_hash_entry *ind; |
| 2515 | |
| 2516 | _bfd_elf_link_hash_copy_indirect (info, _dir, _ind); |
| 2517 | |
| 2518 | if (_ind->root.type != bfd_link_hash_indirect) |
| 2519 | return; |
| 2520 | |
| 2521 | dir = elf_m68k_hash_entry (_dir); |
| 2522 | ind = elf_m68k_hash_entry (_ind); |
| 2523 | |
| 2524 | /* Any absolute non-dynamic relocations against an indirect or weak |
| 2525 | definition will be against the target symbol. */ |
| 2526 | _dir->non_got_ref |= _ind->non_got_ref; |
| 2527 | |
| 2528 | /* We might have a direct symbol already having entries in the GOTs. |
| 2529 | Update its key only in case indirect symbol has GOT entries and |
| 2530 | assert that both indirect and direct symbols don't have GOT entries |
| 2531 | at the same time. */ |
| 2532 | if (ind->got_entry_key != 0) |
| 2533 | { |
| 2534 | BFD_ASSERT (dir->got_entry_key == 0); |
| 2535 | /* Assert that GOTs aren't partioned yet. */ |
| 2536 | BFD_ASSERT (ind->glist == NULL); |
| 2537 | |
| 2538 | dir->got_entry_key = ind->got_entry_key; |
| 2539 | ind->got_entry_key = 0; |
| 2540 | } |
| 2541 | } |
| 2542 | |
| 2543 | /* Look through the relocs for a section during the first phase, and |
| 2544 | allocate space in the global offset table or procedure linkage |
| 2545 | table. */ |
| 2546 | |
| 2547 | static bfd_boolean |
| 2548 | elf_m68k_check_relocs (bfd *abfd, |
| 2549 | struct bfd_link_info *info, |
| 2550 | asection *sec, |
| 2551 | const Elf_Internal_Rela *relocs) |
| 2552 | { |
| 2553 | bfd *dynobj; |
| 2554 | Elf_Internal_Shdr *symtab_hdr; |
| 2555 | struct elf_link_hash_entry **sym_hashes; |
| 2556 | const Elf_Internal_Rela *rel; |
| 2557 | const Elf_Internal_Rela *rel_end; |
| 2558 | asection *sgot; |
| 2559 | asection *srelgot; |
| 2560 | asection *sreloc; |
| 2561 | struct elf_m68k_got *got; |
| 2562 | |
| 2563 | if (info->relocatable) |
| 2564 | return TRUE; |
| 2565 | |
| 2566 | dynobj = elf_hash_table (info)->dynobj; |
| 2567 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 2568 | sym_hashes = elf_sym_hashes (abfd); |
| 2569 | |
| 2570 | sgot = NULL; |
| 2571 | srelgot = NULL; |
| 2572 | sreloc = NULL; |
| 2573 | |
| 2574 | got = NULL; |
| 2575 | |
| 2576 | rel_end = relocs + sec->reloc_count; |
| 2577 | for (rel = relocs; rel < rel_end; rel++) |
| 2578 | { |
| 2579 | unsigned long r_symndx; |
| 2580 | struct elf_link_hash_entry *h; |
| 2581 | |
| 2582 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 2583 | |
| 2584 | if (r_symndx < symtab_hdr->sh_info) |
| 2585 | h = NULL; |
| 2586 | else |
| 2587 | { |
| 2588 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 2589 | while (h->root.type == bfd_link_hash_indirect |
| 2590 | || h->root.type == bfd_link_hash_warning) |
| 2591 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 2592 | } |
| 2593 | |
| 2594 | switch (ELF32_R_TYPE (rel->r_info)) |
| 2595 | { |
| 2596 | case R_68K_GOT8: |
| 2597 | case R_68K_GOT16: |
| 2598 | case R_68K_GOT32: |
| 2599 | if (h != NULL |
| 2600 | && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) |
| 2601 | break; |
| 2602 | /* Fall through. */ |
| 2603 | |
| 2604 | /* Relative GOT relocations. */ |
| 2605 | case R_68K_GOT8O: |
| 2606 | case R_68K_GOT16O: |
| 2607 | case R_68K_GOT32O: |
| 2608 | /* Fall through. */ |
| 2609 | |
| 2610 | /* TLS relocations. */ |
| 2611 | case R_68K_TLS_GD8: |
| 2612 | case R_68K_TLS_GD16: |
| 2613 | case R_68K_TLS_GD32: |
| 2614 | case R_68K_TLS_LDM8: |
| 2615 | case R_68K_TLS_LDM16: |
| 2616 | case R_68K_TLS_LDM32: |
| 2617 | case R_68K_TLS_IE8: |
| 2618 | case R_68K_TLS_IE16: |
| 2619 | case R_68K_TLS_IE32: |
| 2620 | |
| 2621 | case R_68K_TLS_TPREL32: |
| 2622 | case R_68K_TLS_DTPREL32: |
| 2623 | |
| 2624 | if (ELF32_R_TYPE (rel->r_info) == R_68K_TLS_TPREL32 |
| 2625 | && info->shared) |
| 2626 | /* Do the special chorus for libraries with static TLS. */ |
| 2627 | info->flags |= DF_STATIC_TLS; |
| 2628 | |
| 2629 | /* This symbol requires a global offset table entry. */ |
| 2630 | |
| 2631 | if (dynobj == NULL) |
| 2632 | { |
| 2633 | /* Create the .got section. */ |
| 2634 | elf_hash_table (info)->dynobj = dynobj = abfd; |
| 2635 | if (!_bfd_elf_create_got_section (dynobj, info)) |
| 2636 | return FALSE; |
| 2637 | } |
| 2638 | |
| 2639 | if (sgot == NULL) |
| 2640 | { |
| 2641 | sgot = bfd_get_linker_section (dynobj, ".got"); |
| 2642 | BFD_ASSERT (sgot != NULL); |
| 2643 | } |
| 2644 | |
| 2645 | if (srelgot == NULL |
| 2646 | && (h != NULL || info->shared)) |
| 2647 | { |
| 2648 | srelgot = bfd_get_linker_section (dynobj, ".rela.got"); |
| 2649 | if (srelgot == NULL) |
| 2650 | { |
| 2651 | flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS |
| 2652 | | SEC_IN_MEMORY | SEC_LINKER_CREATED |
| 2653 | | SEC_READONLY); |
| 2654 | srelgot = bfd_make_section_anyway_with_flags (dynobj, |
| 2655 | ".rela.got", |
| 2656 | flags); |
| 2657 | if (srelgot == NULL |
| 2658 | || !bfd_set_section_alignment (dynobj, srelgot, 2)) |
| 2659 | return FALSE; |
| 2660 | } |
| 2661 | } |
| 2662 | |
| 2663 | if (got == NULL) |
| 2664 | { |
| 2665 | struct elf_m68k_bfd2got_entry *bfd2got_entry; |
| 2666 | |
| 2667 | bfd2got_entry |
| 2668 | = elf_m68k_get_bfd2got_entry (elf_m68k_multi_got (info), |
| 2669 | abfd, FIND_OR_CREATE, info); |
| 2670 | if (bfd2got_entry == NULL) |
| 2671 | return FALSE; |
| 2672 | |
| 2673 | got = bfd2got_entry->got; |
| 2674 | BFD_ASSERT (got != NULL); |
| 2675 | } |
| 2676 | |
| 2677 | { |
| 2678 | struct elf_m68k_got_entry *got_entry; |
| 2679 | |
| 2680 | /* Add entry to got. */ |
| 2681 | got_entry = elf_m68k_add_entry_to_got (got, h, abfd, |
| 2682 | ELF32_R_TYPE (rel->r_info), |
| 2683 | r_symndx, info); |
| 2684 | if (got_entry == NULL) |
| 2685 | return FALSE; |
| 2686 | |
| 2687 | if (got_entry->u.s1.refcount == 1) |
| 2688 | { |
| 2689 | /* Make sure this symbol is output as a dynamic symbol. */ |
| 2690 | if (h != NULL |
| 2691 | && h->dynindx == -1 |
| 2692 | && !h->forced_local) |
| 2693 | { |
| 2694 | if (!bfd_elf_link_record_dynamic_symbol (info, h)) |
| 2695 | return FALSE; |
| 2696 | } |
| 2697 | } |
| 2698 | } |
| 2699 | |
| 2700 | break; |
| 2701 | |
| 2702 | case R_68K_PLT8: |
| 2703 | case R_68K_PLT16: |
| 2704 | case R_68K_PLT32: |
| 2705 | /* This symbol requires a procedure linkage table entry. We |
| 2706 | actually build the entry in adjust_dynamic_symbol, |
| 2707 | because this might be a case of linking PIC code which is |
| 2708 | never referenced by a dynamic object, in which case we |
| 2709 | don't need to generate a procedure linkage table entry |
| 2710 | after all. */ |
| 2711 | |
| 2712 | /* If this is a local symbol, we resolve it directly without |
| 2713 | creating a procedure linkage table entry. */ |
| 2714 | if (h == NULL) |
| 2715 | continue; |
| 2716 | |
| 2717 | h->needs_plt = 1; |
| 2718 | h->plt.refcount++; |
| 2719 | break; |
| 2720 | |
| 2721 | case R_68K_PLT8O: |
| 2722 | case R_68K_PLT16O: |
| 2723 | case R_68K_PLT32O: |
| 2724 | /* This symbol requires a procedure linkage table entry. */ |
| 2725 | |
| 2726 | if (h == NULL) |
| 2727 | { |
| 2728 | /* It does not make sense to have this relocation for a |
| 2729 | local symbol. FIXME: does it? How to handle it if |
| 2730 | it does make sense? */ |
| 2731 | bfd_set_error (bfd_error_bad_value); |
| 2732 | return FALSE; |
| 2733 | } |
| 2734 | |
| 2735 | /* Make sure this symbol is output as a dynamic symbol. */ |
| 2736 | if (h->dynindx == -1 |
| 2737 | && !h->forced_local) |
| 2738 | { |
| 2739 | if (!bfd_elf_link_record_dynamic_symbol (info, h)) |
| 2740 | return FALSE; |
| 2741 | } |
| 2742 | |
| 2743 | h->needs_plt = 1; |
| 2744 | h->plt.refcount++; |
| 2745 | break; |
| 2746 | |
| 2747 | case R_68K_PC8: |
| 2748 | case R_68K_PC16: |
| 2749 | case R_68K_PC32: |
| 2750 | /* If we are creating a shared library and this is not a local |
| 2751 | symbol, we need to copy the reloc into the shared library. |
| 2752 | However when linking with -Bsymbolic and this is a global |
| 2753 | symbol which is defined in an object we are including in the |
| 2754 | link (i.e., DEF_REGULAR is set), then we can resolve the |
| 2755 | reloc directly. At this point we have not seen all the input |
| 2756 | files, so it is possible that DEF_REGULAR is not set now but |
| 2757 | will be set later (it is never cleared). We account for that |
| 2758 | possibility below by storing information in the |
| 2759 | pcrel_relocs_copied field of the hash table entry. */ |
| 2760 | if (!(info->shared |
| 2761 | && (sec->flags & SEC_ALLOC) != 0 |
| 2762 | && h != NULL |
| 2763 | && (!info->symbolic |
| 2764 | || h->root.type == bfd_link_hash_defweak |
| 2765 | || !h->def_regular))) |
| 2766 | { |
| 2767 | if (h != NULL) |
| 2768 | { |
| 2769 | /* Make sure a plt entry is created for this symbol if |
| 2770 | it turns out to be a function defined by a dynamic |
| 2771 | object. */ |
| 2772 | h->plt.refcount++; |
| 2773 | } |
| 2774 | break; |
| 2775 | } |
| 2776 | /* Fall through. */ |
| 2777 | case R_68K_8: |
| 2778 | case R_68K_16: |
| 2779 | case R_68K_32: |
| 2780 | /* We don't need to handle relocs into sections not going into |
| 2781 | the "real" output. */ |
| 2782 | if ((sec->flags & SEC_ALLOC) == 0) |
| 2783 | break; |
| 2784 | |
| 2785 | if (h != NULL) |
| 2786 | { |
| 2787 | /* Make sure a plt entry is created for this symbol if it |
| 2788 | turns out to be a function defined by a dynamic object. */ |
| 2789 | h->plt.refcount++; |
| 2790 | |
| 2791 | if (info->executable) |
| 2792 | /* This symbol needs a non-GOT reference. */ |
| 2793 | h->non_got_ref = 1; |
| 2794 | } |
| 2795 | |
| 2796 | /* If we are creating a shared library, we need to copy the |
| 2797 | reloc into the shared library. */ |
| 2798 | if (info->shared) |
| 2799 | { |
| 2800 | /* When creating a shared object, we must copy these |
| 2801 | reloc types into the output file. We create a reloc |
| 2802 | section in dynobj and make room for this reloc. */ |
| 2803 | if (sreloc == NULL) |
| 2804 | { |
| 2805 | sreloc = _bfd_elf_make_dynamic_reloc_section |
| 2806 | (sec, dynobj, 2, abfd, /*rela?*/ TRUE); |
| 2807 | |
| 2808 | if (sreloc == NULL) |
| 2809 | return FALSE; |
| 2810 | } |
| 2811 | |
| 2812 | if (sec->flags & SEC_READONLY |
| 2813 | /* Don't set DF_TEXTREL yet for PC relative |
| 2814 | relocations, they might be discarded later. */ |
| 2815 | && !(ELF32_R_TYPE (rel->r_info) == R_68K_PC8 |
| 2816 | || ELF32_R_TYPE (rel->r_info) == R_68K_PC16 |
| 2817 | || ELF32_R_TYPE (rel->r_info) == R_68K_PC32)) |
| 2818 | info->flags |= DF_TEXTREL; |
| 2819 | |
| 2820 | sreloc->size += sizeof (Elf32_External_Rela); |
| 2821 | |
| 2822 | /* We count the number of PC relative relocations we have |
| 2823 | entered for this symbol, so that we can discard them |
| 2824 | again if, in the -Bsymbolic case, the symbol is later |
| 2825 | defined by a regular object, or, in the normal shared |
| 2826 | case, the symbol is forced to be local. Note that this |
| 2827 | function is only called if we are using an m68kelf linker |
| 2828 | hash table, which means that h is really a pointer to an |
| 2829 | elf_m68k_link_hash_entry. */ |
| 2830 | if (ELF32_R_TYPE (rel->r_info) == R_68K_PC8 |
| 2831 | || ELF32_R_TYPE (rel->r_info) == R_68K_PC16 |
| 2832 | || ELF32_R_TYPE (rel->r_info) == R_68K_PC32) |
| 2833 | { |
| 2834 | struct elf_m68k_pcrel_relocs_copied *p; |
| 2835 | struct elf_m68k_pcrel_relocs_copied **head; |
| 2836 | |
| 2837 | if (h != NULL) |
| 2838 | { |
| 2839 | struct elf_m68k_link_hash_entry *eh |
| 2840 | = elf_m68k_hash_entry (h); |
| 2841 | head = &eh->pcrel_relocs_copied; |
| 2842 | } |
| 2843 | else |
| 2844 | { |
| 2845 | asection *s; |
| 2846 | void *vpp; |
| 2847 | Elf_Internal_Sym *isym; |
| 2848 | |
| 2849 | isym = bfd_sym_from_r_symndx (&elf_m68k_hash_table (info)->sym_cache, |
| 2850 | abfd, r_symndx); |
| 2851 | if (isym == NULL) |
| 2852 | return FALSE; |
| 2853 | |
| 2854 | s = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| 2855 | if (s == NULL) |
| 2856 | s = sec; |
| 2857 | |
| 2858 | vpp = &elf_section_data (s)->local_dynrel; |
| 2859 | head = (struct elf_m68k_pcrel_relocs_copied **) vpp; |
| 2860 | } |
| 2861 | |
| 2862 | for (p = *head; p != NULL; p = p->next) |
| 2863 | if (p->section == sreloc) |
| 2864 | break; |
| 2865 | |
| 2866 | if (p == NULL) |
| 2867 | { |
| 2868 | p = ((struct elf_m68k_pcrel_relocs_copied *) |
| 2869 | bfd_alloc (dynobj, (bfd_size_type) sizeof *p)); |
| 2870 | if (p == NULL) |
| 2871 | return FALSE; |
| 2872 | p->next = *head; |
| 2873 | *head = p; |
| 2874 | p->section = sreloc; |
| 2875 | p->count = 0; |
| 2876 | } |
| 2877 | |
| 2878 | ++p->count; |
| 2879 | } |
| 2880 | } |
| 2881 | |
| 2882 | break; |
| 2883 | |
| 2884 | /* This relocation describes the C++ object vtable hierarchy. |
| 2885 | Reconstruct it for later use during GC. */ |
| 2886 | case R_68K_GNU_VTINHERIT: |
| 2887 | if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) |
| 2888 | return FALSE; |
| 2889 | break; |
| 2890 | |
| 2891 | /* This relocation describes which C++ vtable entries are actually |
| 2892 | used. Record for later use during GC. */ |
| 2893 | case R_68K_GNU_VTENTRY: |
| 2894 | BFD_ASSERT (h != NULL); |
| 2895 | if (h != NULL |
| 2896 | && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) |
| 2897 | return FALSE; |
| 2898 | break; |
| 2899 | |
| 2900 | default: |
| 2901 | break; |
| 2902 | } |
| 2903 | } |
| 2904 | |
| 2905 | return TRUE; |
| 2906 | } |
| 2907 | |
| 2908 | /* Return the section that should be marked against GC for a given |
| 2909 | relocation. */ |
| 2910 | |
| 2911 | static asection * |
| 2912 | elf_m68k_gc_mark_hook (asection *sec, |
| 2913 | struct bfd_link_info *info, |
| 2914 | Elf_Internal_Rela *rel, |
| 2915 | struct elf_link_hash_entry *h, |
| 2916 | Elf_Internal_Sym *sym) |
| 2917 | { |
| 2918 | if (h != NULL) |
| 2919 | switch (ELF32_R_TYPE (rel->r_info)) |
| 2920 | { |
| 2921 | case R_68K_GNU_VTINHERIT: |
| 2922 | case R_68K_GNU_VTENTRY: |
| 2923 | return NULL; |
| 2924 | } |
| 2925 | |
| 2926 | return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); |
| 2927 | } |
| 2928 | |
| 2929 | /* Update the got entry reference counts for the section being removed. */ |
| 2930 | |
| 2931 | static bfd_boolean |
| 2932 | elf_m68k_gc_sweep_hook (bfd *abfd, |
| 2933 | struct bfd_link_info *info, |
| 2934 | asection *sec, |
| 2935 | const Elf_Internal_Rela *relocs) |
| 2936 | { |
| 2937 | Elf_Internal_Shdr *symtab_hdr; |
| 2938 | struct elf_link_hash_entry **sym_hashes; |
| 2939 | const Elf_Internal_Rela *rel, *relend; |
| 2940 | bfd *dynobj; |
| 2941 | struct elf_m68k_got *got; |
| 2942 | |
| 2943 | if (info->relocatable) |
| 2944 | return TRUE; |
| 2945 | |
| 2946 | dynobj = elf_hash_table (info)->dynobj; |
| 2947 | if (dynobj == NULL) |
| 2948 | return TRUE; |
| 2949 | |
| 2950 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 2951 | sym_hashes = elf_sym_hashes (abfd); |
| 2952 | got = NULL; |
| 2953 | |
| 2954 | relend = relocs + sec->reloc_count; |
| 2955 | for (rel = relocs; rel < relend; rel++) |
| 2956 | { |
| 2957 | unsigned long r_symndx; |
| 2958 | struct elf_link_hash_entry *h = NULL; |
| 2959 | |
| 2960 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 2961 | if (r_symndx >= symtab_hdr->sh_info) |
| 2962 | { |
| 2963 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 2964 | while (h->root.type == bfd_link_hash_indirect |
| 2965 | || h->root.type == bfd_link_hash_warning) |
| 2966 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 2967 | } |
| 2968 | |
| 2969 | switch (ELF32_R_TYPE (rel->r_info)) |
| 2970 | { |
| 2971 | case R_68K_GOT8: |
| 2972 | case R_68K_GOT16: |
| 2973 | case R_68K_GOT32: |
| 2974 | if (h != NULL |
| 2975 | && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) |
| 2976 | break; |
| 2977 | |
| 2978 | /* FALLTHRU */ |
| 2979 | case R_68K_GOT8O: |
| 2980 | case R_68K_GOT16O: |
| 2981 | case R_68K_GOT32O: |
| 2982 | /* Fall through. */ |
| 2983 | |
| 2984 | /* TLS relocations. */ |
| 2985 | case R_68K_TLS_GD8: |
| 2986 | case R_68K_TLS_GD16: |
| 2987 | case R_68K_TLS_GD32: |
| 2988 | case R_68K_TLS_LDM8: |
| 2989 | case R_68K_TLS_LDM16: |
| 2990 | case R_68K_TLS_LDM32: |
| 2991 | case R_68K_TLS_IE8: |
| 2992 | case R_68K_TLS_IE16: |
| 2993 | case R_68K_TLS_IE32: |
| 2994 | |
| 2995 | case R_68K_TLS_TPREL32: |
| 2996 | case R_68K_TLS_DTPREL32: |
| 2997 | |
| 2998 | if (got == NULL) |
| 2999 | { |
| 3000 | got = elf_m68k_get_bfd2got_entry (elf_m68k_multi_got (info), |
| 3001 | abfd, MUST_FIND, NULL)->got; |
| 3002 | BFD_ASSERT (got != NULL); |
| 3003 | } |
| 3004 | |
| 3005 | { |
| 3006 | struct elf_m68k_got_entry_key key_; |
| 3007 | struct elf_m68k_got_entry **got_entry_ptr; |
| 3008 | struct elf_m68k_got_entry *got_entry; |
| 3009 | |
| 3010 | elf_m68k_init_got_entry_key (&key_, h, abfd, r_symndx, |
| 3011 | ELF32_R_TYPE (rel->r_info)); |
| 3012 | got_entry_ptr = elf_m68k_find_got_entry_ptr (got, &key_); |
| 3013 | |
| 3014 | got_entry = *got_entry_ptr; |
| 3015 | |
| 3016 | if (got_entry->u.s1.refcount > 0) |
| 3017 | { |
| 3018 | --got_entry->u.s1.refcount; |
| 3019 | |
| 3020 | if (got_entry->u.s1.refcount == 0) |
| 3021 | /* We don't need the .got entry any more. */ |
| 3022 | elf_m68k_remove_got_entry (got, got_entry_ptr); |
| 3023 | } |
| 3024 | } |
| 3025 | break; |
| 3026 | |
| 3027 | case R_68K_PLT8: |
| 3028 | case R_68K_PLT16: |
| 3029 | case R_68K_PLT32: |
| 3030 | case R_68K_PLT8O: |
| 3031 | case R_68K_PLT16O: |
| 3032 | case R_68K_PLT32O: |
| 3033 | case R_68K_PC8: |
| 3034 | case R_68K_PC16: |
| 3035 | case R_68K_PC32: |
| 3036 | case R_68K_8: |
| 3037 | case R_68K_16: |
| 3038 | case R_68K_32: |
| 3039 | if (h != NULL) |
| 3040 | { |
| 3041 | if (h->plt.refcount > 0) |
| 3042 | --h->plt.refcount; |
| 3043 | } |
| 3044 | break; |
| 3045 | |
| 3046 | default: |
| 3047 | break; |
| 3048 | } |
| 3049 | } |
| 3050 | |
| 3051 | return TRUE; |
| 3052 | } |
| 3053 | \f |
| 3054 | /* Return the type of PLT associated with OUTPUT_BFD. */ |
| 3055 | |
| 3056 | static const struct elf_m68k_plt_info * |
| 3057 | elf_m68k_get_plt_info (bfd *output_bfd) |
| 3058 | { |
| 3059 | unsigned int features; |
| 3060 | |
| 3061 | features = bfd_m68k_mach_to_features (bfd_get_mach (output_bfd)); |
| 3062 | if (features & cpu32) |
| 3063 | return &elf_cpu32_plt_info; |
| 3064 | if (features & mcfisa_b) |
| 3065 | return &elf_isab_plt_info; |
| 3066 | if (features & mcfisa_c) |
| 3067 | return &elf_isac_plt_info; |
| 3068 | return &elf_m68k_plt_info; |
| 3069 | } |
| 3070 | |
| 3071 | /* This function is called after all the input files have been read, |
| 3072 | and the input sections have been assigned to output sections. |
| 3073 | It's a convenient place to determine the PLT style. */ |
| 3074 | |
| 3075 | static bfd_boolean |
| 3076 | elf_m68k_always_size_sections (bfd *output_bfd, struct bfd_link_info *info) |
| 3077 | { |
| 3078 | /* Bind input BFDs to GOTs and calculate sizes of .got and .rela.got |
| 3079 | sections. */ |
| 3080 | if (!elf_m68k_partition_multi_got (info)) |
| 3081 | return FALSE; |
| 3082 | |
| 3083 | elf_m68k_hash_table (info)->plt_info = elf_m68k_get_plt_info (output_bfd); |
| 3084 | return TRUE; |
| 3085 | } |
| 3086 | |
| 3087 | /* Adjust a symbol defined by a dynamic object and referenced by a |
| 3088 | regular object. The current definition is in some section of the |
| 3089 | dynamic object, but we're not including those sections. We have to |
| 3090 | change the definition to something the rest of the link can |
| 3091 | understand. */ |
| 3092 | |
| 3093 | static bfd_boolean |
| 3094 | elf_m68k_adjust_dynamic_symbol (struct bfd_link_info *info, |
| 3095 | struct elf_link_hash_entry *h) |
| 3096 | { |
| 3097 | struct elf_m68k_link_hash_table *htab; |
| 3098 | bfd *dynobj; |
| 3099 | asection *s; |
| 3100 | |
| 3101 | htab = elf_m68k_hash_table (info); |
| 3102 | dynobj = elf_hash_table (info)->dynobj; |
| 3103 | |
| 3104 | /* Make sure we know what is going on here. */ |
| 3105 | BFD_ASSERT (dynobj != NULL |
| 3106 | && (h->needs_plt |
| 3107 | || h->u.weakdef != NULL |
| 3108 | || (h->def_dynamic |
| 3109 | && h->ref_regular |
| 3110 | && !h->def_regular))); |
| 3111 | |
| 3112 | /* If this is a function, put it in the procedure linkage table. We |
| 3113 | will fill in the contents of the procedure linkage table later, |
| 3114 | when we know the address of the .got section. */ |
| 3115 | if (h->type == STT_FUNC |
| 3116 | || h->needs_plt) |
| 3117 | { |
| 3118 | if ((h->plt.refcount <= 0 |
| 3119 | || SYMBOL_CALLS_LOCAL (info, h) |
| 3120 | || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT |
| 3121 | && h->root.type == bfd_link_hash_undefweak)) |
| 3122 | /* We must always create the plt entry if it was referenced |
| 3123 | by a PLTxxO relocation. In this case we already recorded |
| 3124 | it as a dynamic symbol. */ |
| 3125 | && h->dynindx == -1) |
| 3126 | { |
| 3127 | /* This case can occur if we saw a PLTxx reloc in an input |
| 3128 | file, but the symbol was never referred to by a dynamic |
| 3129 | object, or if all references were garbage collected. In |
| 3130 | such a case, we don't actually need to build a procedure |
| 3131 | linkage table, and we can just do a PCxx reloc instead. */ |
| 3132 | h->plt.offset = (bfd_vma) -1; |
| 3133 | h->needs_plt = 0; |
| 3134 | return TRUE; |
| 3135 | } |
| 3136 | |
| 3137 | /* Make sure this symbol is output as a dynamic symbol. */ |
| 3138 | if (h->dynindx == -1 |
| 3139 | && !h->forced_local) |
| 3140 | { |
| 3141 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 3142 | return FALSE; |
| 3143 | } |
| 3144 | |
| 3145 | s = bfd_get_linker_section (dynobj, ".plt"); |
| 3146 | BFD_ASSERT (s != NULL); |
| 3147 | |
| 3148 | /* If this is the first .plt entry, make room for the special |
| 3149 | first entry. */ |
| 3150 | if (s->size == 0) |
| 3151 | s->size = htab->plt_info->size; |
| 3152 | |
| 3153 | /* If this symbol is not defined in a regular file, and we are |
| 3154 | not generating a shared library, then set the symbol to this |
| 3155 | location in the .plt. This is required to make function |
| 3156 | pointers compare as equal between the normal executable and |
| 3157 | the shared library. */ |
| 3158 | if (!info->shared |
| 3159 | && !h->def_regular) |
| 3160 | { |
| 3161 | h->root.u.def.section = s; |
| 3162 | h->root.u.def.value = s->size; |
| 3163 | } |
| 3164 | |
| 3165 | h->plt.offset = s->size; |
| 3166 | |
| 3167 | /* Make room for this entry. */ |
| 3168 | s->size += htab->plt_info->size; |
| 3169 | |
| 3170 | /* We also need to make an entry in the .got.plt section, which |
| 3171 | will be placed in the .got section by the linker script. */ |
| 3172 | s = bfd_get_linker_section (dynobj, ".got.plt"); |
| 3173 | BFD_ASSERT (s != NULL); |
| 3174 | s->size += 4; |
| 3175 | |
| 3176 | /* We also need to make an entry in the .rela.plt section. */ |
| 3177 | s = bfd_get_linker_section (dynobj, ".rela.plt"); |
| 3178 | BFD_ASSERT (s != NULL); |
| 3179 | s->size += sizeof (Elf32_External_Rela); |
| 3180 | |
| 3181 | return TRUE; |
| 3182 | } |
| 3183 | |
| 3184 | /* Reinitialize the plt offset now that it is not used as a reference |
| 3185 | count any more. */ |
| 3186 | h->plt.offset = (bfd_vma) -1; |
| 3187 | |
| 3188 | /* If this is a weak symbol, and there is a real definition, the |
| 3189 | processor independent code will have arranged for us to see the |
| 3190 | real definition first, and we can just use the same value. */ |
| 3191 | if (h->u.weakdef != NULL) |
| 3192 | { |
| 3193 | BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined |
| 3194 | || h->u.weakdef->root.type == bfd_link_hash_defweak); |
| 3195 | h->root.u.def.section = h->u.weakdef->root.u.def.section; |
| 3196 | h->root.u.def.value = h->u.weakdef->root.u.def.value; |
| 3197 | return TRUE; |
| 3198 | } |
| 3199 | |
| 3200 | /* This is a reference to a symbol defined by a dynamic object which |
| 3201 | is not a function. */ |
| 3202 | |
| 3203 | /* If we are creating a shared library, we must presume that the |
| 3204 | only references to the symbol are via the global offset table. |
| 3205 | For such cases we need not do anything here; the relocations will |
| 3206 | be handled correctly by relocate_section. */ |
| 3207 | if (info->shared) |
| 3208 | return TRUE; |
| 3209 | |
| 3210 | /* If there are no references to this symbol that do not use the |
| 3211 | GOT, we don't need to generate a copy reloc. */ |
| 3212 | if (!h->non_got_ref) |
| 3213 | return TRUE; |
| 3214 | |
| 3215 | /* We must allocate the symbol in our .dynbss section, which will |
| 3216 | become part of the .bss section of the executable. There will be |
| 3217 | an entry for this symbol in the .dynsym section. The dynamic |
| 3218 | object will contain position independent code, so all references |
| 3219 | from the dynamic object to this symbol will go through the global |
| 3220 | offset table. The dynamic linker will use the .dynsym entry to |
| 3221 | determine the address it must put in the global offset table, so |
| 3222 | both the dynamic object and the regular object will refer to the |
| 3223 | same memory location for the variable. */ |
| 3224 | |
| 3225 | s = bfd_get_linker_section (dynobj, ".dynbss"); |
| 3226 | BFD_ASSERT (s != NULL); |
| 3227 | |
| 3228 | /* We must generate a R_68K_COPY reloc to tell the dynamic linker to |
| 3229 | copy the initial value out of the dynamic object and into the |
| 3230 | runtime process image. We need to remember the offset into the |
| 3231 | .rela.bss section we are going to use. */ |
| 3232 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) |
| 3233 | { |
| 3234 | asection *srel; |
| 3235 | |
| 3236 | srel = bfd_get_linker_section (dynobj, ".rela.bss"); |
| 3237 | BFD_ASSERT (srel != NULL); |
| 3238 | srel->size += sizeof (Elf32_External_Rela); |
| 3239 | h->needs_copy = 1; |
| 3240 | } |
| 3241 | |
| 3242 | return _bfd_elf_adjust_dynamic_copy (h, s); |
| 3243 | } |
| 3244 | |
| 3245 | /* Set the sizes of the dynamic sections. */ |
| 3246 | |
| 3247 | static bfd_boolean |
| 3248 | elf_m68k_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, |
| 3249 | struct bfd_link_info *info) |
| 3250 | { |
| 3251 | bfd *dynobj; |
| 3252 | asection *s; |
| 3253 | bfd_boolean plt; |
| 3254 | bfd_boolean relocs; |
| 3255 | |
| 3256 | dynobj = elf_hash_table (info)->dynobj; |
| 3257 | BFD_ASSERT (dynobj != NULL); |
| 3258 | |
| 3259 | if (elf_hash_table (info)->dynamic_sections_created) |
| 3260 | { |
| 3261 | /* Set the contents of the .interp section to the interpreter. */ |
| 3262 | if (info->executable) |
| 3263 | { |
| 3264 | s = bfd_get_linker_section (dynobj, ".interp"); |
| 3265 | BFD_ASSERT (s != NULL); |
| 3266 | s->size = sizeof ELF_DYNAMIC_INTERPRETER; |
| 3267 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; |
| 3268 | } |
| 3269 | } |
| 3270 | else |
| 3271 | { |
| 3272 | /* We may have created entries in the .rela.got section. |
| 3273 | However, if we are not creating the dynamic sections, we will |
| 3274 | not actually use these entries. Reset the size of .rela.got, |
| 3275 | which will cause it to get stripped from the output file |
| 3276 | below. */ |
| 3277 | s = bfd_get_linker_section (dynobj, ".rela.got"); |
| 3278 | if (s != NULL) |
| 3279 | s->size = 0; |
| 3280 | } |
| 3281 | |
| 3282 | /* If this is a -Bsymbolic shared link, then we need to discard all |
| 3283 | PC relative relocs against symbols defined in a regular object. |
| 3284 | For the normal shared case we discard the PC relative relocs |
| 3285 | against symbols that have become local due to visibility changes. |
| 3286 | We allocated space for them in the check_relocs routine, but we |
| 3287 | will not fill them in in the relocate_section routine. */ |
| 3288 | if (info->shared) |
| 3289 | elf_link_hash_traverse (elf_hash_table (info), |
| 3290 | elf_m68k_discard_copies, |
| 3291 | info); |
| 3292 | |
| 3293 | /* The check_relocs and adjust_dynamic_symbol entry points have |
| 3294 | determined the sizes of the various dynamic sections. Allocate |
| 3295 | memory for them. */ |
| 3296 | plt = FALSE; |
| 3297 | relocs = FALSE; |
| 3298 | for (s = dynobj->sections; s != NULL; s = s->next) |
| 3299 | { |
| 3300 | const char *name; |
| 3301 | |
| 3302 | if ((s->flags & SEC_LINKER_CREATED) == 0) |
| 3303 | continue; |
| 3304 | |
| 3305 | /* It's OK to base decisions on the section name, because none |
| 3306 | of the dynobj section names depend upon the input files. */ |
| 3307 | name = bfd_get_section_name (dynobj, s); |
| 3308 | |
| 3309 | if (strcmp (name, ".plt") == 0) |
| 3310 | { |
| 3311 | /* Remember whether there is a PLT. */ |
| 3312 | plt = s->size != 0; |
| 3313 | } |
| 3314 | else if (CONST_STRNEQ (name, ".rela")) |
| 3315 | { |
| 3316 | if (s->size != 0) |
| 3317 | { |
| 3318 | relocs = TRUE; |
| 3319 | |
| 3320 | /* We use the reloc_count field as a counter if we need |
| 3321 | to copy relocs into the output file. */ |
| 3322 | s->reloc_count = 0; |
| 3323 | } |
| 3324 | } |
| 3325 | else if (! CONST_STRNEQ (name, ".got") |
| 3326 | && strcmp (name, ".dynbss") != 0) |
| 3327 | { |
| 3328 | /* It's not one of our sections, so don't allocate space. */ |
| 3329 | continue; |
| 3330 | } |
| 3331 | |
| 3332 | if (s->size == 0) |
| 3333 | { |
| 3334 | /* If we don't need this section, strip it from the |
| 3335 | output file. This is mostly to handle .rela.bss and |
| 3336 | .rela.plt. We must create both sections in |
| 3337 | create_dynamic_sections, because they must be created |
| 3338 | before the linker maps input sections to output |
| 3339 | sections. The linker does that before |
| 3340 | adjust_dynamic_symbol is called, and it is that |
| 3341 | function which decides whether anything needs to go |
| 3342 | into these sections. */ |
| 3343 | s->flags |= SEC_EXCLUDE; |
| 3344 | continue; |
| 3345 | } |
| 3346 | |
| 3347 | if ((s->flags & SEC_HAS_CONTENTS) == 0) |
| 3348 | continue; |
| 3349 | |
| 3350 | /* Allocate memory for the section contents. */ |
| 3351 | /* FIXME: This should be a call to bfd_alloc not bfd_zalloc. |
| 3352 | Unused entries should be reclaimed before the section's contents |
| 3353 | are written out, but at the moment this does not happen. Thus in |
| 3354 | order to prevent writing out garbage, we initialise the section's |
| 3355 | contents to zero. */ |
| 3356 | s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); |
| 3357 | if (s->contents == NULL) |
| 3358 | return FALSE; |
| 3359 | } |
| 3360 | |
| 3361 | if (elf_hash_table (info)->dynamic_sections_created) |
| 3362 | { |
| 3363 | /* Add some entries to the .dynamic section. We fill in the |
| 3364 | values later, in elf_m68k_finish_dynamic_sections, but we |
| 3365 | must add the entries now so that we get the correct size for |
| 3366 | the .dynamic section. The DT_DEBUG entry is filled in by the |
| 3367 | dynamic linker and used by the debugger. */ |
| 3368 | #define add_dynamic_entry(TAG, VAL) \ |
| 3369 | _bfd_elf_add_dynamic_entry (info, TAG, VAL) |
| 3370 | |
| 3371 | if (!info->shared) |
| 3372 | { |
| 3373 | if (!add_dynamic_entry (DT_DEBUG, 0)) |
| 3374 | return FALSE; |
| 3375 | } |
| 3376 | |
| 3377 | if (plt) |
| 3378 | { |
| 3379 | if (!add_dynamic_entry (DT_PLTGOT, 0) |
| 3380 | || !add_dynamic_entry (DT_PLTRELSZ, 0) |
| 3381 | || !add_dynamic_entry (DT_PLTREL, DT_RELA) |
| 3382 | || !add_dynamic_entry (DT_JMPREL, 0)) |
| 3383 | return FALSE; |
| 3384 | } |
| 3385 | |
| 3386 | if (relocs) |
| 3387 | { |
| 3388 | if (!add_dynamic_entry (DT_RELA, 0) |
| 3389 | || !add_dynamic_entry (DT_RELASZ, 0) |
| 3390 | || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela))) |
| 3391 | return FALSE; |
| 3392 | } |
| 3393 | |
| 3394 | if ((info->flags & DF_TEXTREL) != 0) |
| 3395 | { |
| 3396 | if (!add_dynamic_entry (DT_TEXTREL, 0)) |
| 3397 | return FALSE; |
| 3398 | } |
| 3399 | } |
| 3400 | #undef add_dynamic_entry |
| 3401 | |
| 3402 | return TRUE; |
| 3403 | } |
| 3404 | |
| 3405 | /* This function is called via elf_link_hash_traverse if we are |
| 3406 | creating a shared object. In the -Bsymbolic case it discards the |
| 3407 | space allocated to copy PC relative relocs against symbols which |
| 3408 | are defined in regular objects. For the normal shared case, it |
| 3409 | discards space for pc-relative relocs that have become local due to |
| 3410 | symbol visibility changes. We allocated space for them in the |
| 3411 | check_relocs routine, but we won't fill them in in the |
| 3412 | relocate_section routine. |
| 3413 | |
| 3414 | We also check whether any of the remaining relocations apply |
| 3415 | against a readonly section, and set the DF_TEXTREL flag in this |
| 3416 | case. */ |
| 3417 | |
| 3418 | static bfd_boolean |
| 3419 | elf_m68k_discard_copies (struct elf_link_hash_entry *h, |
| 3420 | void * inf) |
| 3421 | { |
| 3422 | struct bfd_link_info *info = (struct bfd_link_info *) inf; |
| 3423 | struct elf_m68k_pcrel_relocs_copied *s; |
| 3424 | |
| 3425 | if (!SYMBOL_CALLS_LOCAL (info, h)) |
| 3426 | { |
| 3427 | if ((info->flags & DF_TEXTREL) == 0) |
| 3428 | { |
| 3429 | /* Look for relocations against read-only sections. */ |
| 3430 | for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied; |
| 3431 | s != NULL; |
| 3432 | s = s->next) |
| 3433 | if ((s->section->flags & SEC_READONLY) != 0) |
| 3434 | { |
| 3435 | info->flags |= DF_TEXTREL; |
| 3436 | break; |
| 3437 | } |
| 3438 | } |
| 3439 | |
| 3440 | /* Make sure undefined weak symbols are output as a dynamic symbol |
| 3441 | in PIEs. */ |
| 3442 | if (h->non_got_ref |
| 3443 | && h->root.type == bfd_link_hash_undefweak |
| 3444 | && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
| 3445 | && h->dynindx == -1 |
| 3446 | && !h->forced_local) |
| 3447 | { |
| 3448 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 3449 | return FALSE; |
| 3450 | } |
| 3451 | |
| 3452 | return TRUE; |
| 3453 | } |
| 3454 | |
| 3455 | for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied; |
| 3456 | s != NULL; |
| 3457 | s = s->next) |
| 3458 | s->section->size -= s->count * sizeof (Elf32_External_Rela); |
| 3459 | |
| 3460 | return TRUE; |
| 3461 | } |
| 3462 | |
| 3463 | |
| 3464 | /* Install relocation RELA. */ |
| 3465 | |
| 3466 | static void |
| 3467 | elf_m68k_install_rela (bfd *output_bfd, |
| 3468 | asection *srela, |
| 3469 | Elf_Internal_Rela *rela) |
| 3470 | { |
| 3471 | bfd_byte *loc; |
| 3472 | |
| 3473 | loc = srela->contents; |
| 3474 | loc += srela->reloc_count++ * sizeof (Elf32_External_Rela); |
| 3475 | bfd_elf32_swap_reloca_out (output_bfd, rela, loc); |
| 3476 | } |
| 3477 | |
| 3478 | /* Find the base offsets for thread-local storage in this object, |
| 3479 | for GD/LD and IE/LE respectively. */ |
| 3480 | |
| 3481 | #define DTP_OFFSET 0x8000 |
| 3482 | #define TP_OFFSET 0x7000 |
| 3483 | |
| 3484 | static bfd_vma |
| 3485 | dtpoff_base (struct bfd_link_info *info) |
| 3486 | { |
| 3487 | /* If tls_sec is NULL, we should have signalled an error already. */ |
| 3488 | if (elf_hash_table (info)->tls_sec == NULL) |
| 3489 | return 0; |
| 3490 | return elf_hash_table (info)->tls_sec->vma + DTP_OFFSET; |
| 3491 | } |
| 3492 | |
| 3493 | static bfd_vma |
| 3494 | tpoff_base (struct bfd_link_info *info) |
| 3495 | { |
| 3496 | /* If tls_sec is NULL, we should have signalled an error already. */ |
| 3497 | if (elf_hash_table (info)->tls_sec == NULL) |
| 3498 | return 0; |
| 3499 | return elf_hash_table (info)->tls_sec->vma + TP_OFFSET; |
| 3500 | } |
| 3501 | |
| 3502 | /* Output necessary relocation to handle a symbol during static link. |
| 3503 | This function is called from elf_m68k_relocate_section. */ |
| 3504 | |
| 3505 | static void |
| 3506 | elf_m68k_init_got_entry_static (struct bfd_link_info *info, |
| 3507 | bfd *output_bfd, |
| 3508 | enum elf_m68k_reloc_type r_type, |
| 3509 | asection *sgot, |
| 3510 | bfd_vma got_entry_offset, |
| 3511 | bfd_vma relocation) |
| 3512 | { |
| 3513 | switch (elf_m68k_reloc_got_type (r_type)) |
| 3514 | { |
| 3515 | case R_68K_GOT32O: |
| 3516 | bfd_put_32 (output_bfd, relocation, sgot->contents + got_entry_offset); |
| 3517 | break; |
| 3518 | |
| 3519 | case R_68K_TLS_GD32: |
| 3520 | /* We know the offset within the module, |
| 3521 | put it into the second GOT slot. */ |
| 3522 | bfd_put_32 (output_bfd, relocation - dtpoff_base (info), |
| 3523 | sgot->contents + got_entry_offset + 4); |
| 3524 | /* FALLTHRU */ |
| 3525 | |
| 3526 | case R_68K_TLS_LDM32: |
| 3527 | /* Mark it as belonging to module 1, the executable. */ |
| 3528 | bfd_put_32 (output_bfd, 1, sgot->contents + got_entry_offset); |
| 3529 | break; |
| 3530 | |
| 3531 | case R_68K_TLS_IE32: |
| 3532 | bfd_put_32 (output_bfd, relocation - tpoff_base (info), |
| 3533 | sgot->contents + got_entry_offset); |
| 3534 | break; |
| 3535 | |
| 3536 | default: |
| 3537 | BFD_ASSERT (FALSE); |
| 3538 | } |
| 3539 | } |
| 3540 | |
| 3541 | /* Output necessary relocation to handle a local symbol |
| 3542 | during dynamic link. |
| 3543 | This function is called either from elf_m68k_relocate_section |
| 3544 | or from elf_m68k_finish_dynamic_symbol. */ |
| 3545 | |
| 3546 | static void |
| 3547 | elf_m68k_init_got_entry_local_shared (struct bfd_link_info *info, |
| 3548 | bfd *output_bfd, |
| 3549 | enum elf_m68k_reloc_type r_type, |
| 3550 | asection *sgot, |
| 3551 | bfd_vma got_entry_offset, |
| 3552 | bfd_vma relocation, |
| 3553 | asection *srela) |
| 3554 | { |
| 3555 | Elf_Internal_Rela outrel; |
| 3556 | |
| 3557 | switch (elf_m68k_reloc_got_type (r_type)) |
| 3558 | { |
| 3559 | case R_68K_GOT32O: |
| 3560 | /* Emit RELATIVE relocation to initialize GOT slot |
| 3561 | at run-time. */ |
| 3562 | outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE); |
| 3563 | outrel.r_addend = relocation; |
| 3564 | break; |
| 3565 | |
| 3566 | case R_68K_TLS_GD32: |
| 3567 | /* We know the offset within the module, |
| 3568 | put it into the second GOT slot. */ |
| 3569 | bfd_put_32 (output_bfd, relocation - dtpoff_base (info), |
| 3570 | sgot->contents + got_entry_offset + 4); |
| 3571 | /* FALLTHRU */ |
| 3572 | |
| 3573 | case R_68K_TLS_LDM32: |
| 3574 | /* We don't know the module number, |
| 3575 | create a relocation for it. */ |
| 3576 | outrel.r_info = ELF32_R_INFO (0, R_68K_TLS_DTPMOD32); |
| 3577 | outrel.r_addend = 0; |
| 3578 | break; |
| 3579 | |
| 3580 | case R_68K_TLS_IE32: |
| 3581 | /* Emit TPREL relocation to initialize GOT slot |
| 3582 | at run-time. */ |
| 3583 | outrel.r_info = ELF32_R_INFO (0, R_68K_TLS_TPREL32); |
| 3584 | outrel.r_addend = relocation - elf_hash_table (info)->tls_sec->vma; |
| 3585 | break; |
| 3586 | |
| 3587 | default: |
| 3588 | BFD_ASSERT (FALSE); |
| 3589 | } |
| 3590 | |
| 3591 | /* Offset of the GOT entry. */ |
| 3592 | outrel.r_offset = (sgot->output_section->vma |
| 3593 | + sgot->output_offset |
| 3594 | + got_entry_offset); |
| 3595 | |
| 3596 | /* Install one of the above relocations. */ |
| 3597 | elf_m68k_install_rela (output_bfd, srela, &outrel); |
| 3598 | |
| 3599 | bfd_put_32 (output_bfd, outrel.r_addend, sgot->contents + got_entry_offset); |
| 3600 | } |
| 3601 | |
| 3602 | /* Relocate an M68K ELF section. */ |
| 3603 | |
| 3604 | static bfd_boolean |
| 3605 | elf_m68k_relocate_section (bfd *output_bfd, |
| 3606 | struct bfd_link_info *info, |
| 3607 | bfd *input_bfd, |
| 3608 | asection *input_section, |
| 3609 | bfd_byte *contents, |
| 3610 | Elf_Internal_Rela *relocs, |
| 3611 | Elf_Internal_Sym *local_syms, |
| 3612 | asection **local_sections) |
| 3613 | { |
| 3614 | bfd *dynobj; |
| 3615 | Elf_Internal_Shdr *symtab_hdr; |
| 3616 | struct elf_link_hash_entry **sym_hashes; |
| 3617 | asection *sgot; |
| 3618 | asection *splt; |
| 3619 | asection *sreloc; |
| 3620 | asection *srela; |
| 3621 | struct elf_m68k_got *got; |
| 3622 | Elf_Internal_Rela *rel; |
| 3623 | Elf_Internal_Rela *relend; |
| 3624 | |
| 3625 | dynobj = elf_hash_table (info)->dynobj; |
| 3626 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 3627 | sym_hashes = elf_sym_hashes (input_bfd); |
| 3628 | |
| 3629 | sgot = NULL; |
| 3630 | splt = NULL; |
| 3631 | sreloc = NULL; |
| 3632 | srela = NULL; |
| 3633 | |
| 3634 | got = NULL; |
| 3635 | |
| 3636 | rel = relocs; |
| 3637 | relend = relocs + input_section->reloc_count; |
| 3638 | for (; rel < relend; rel++) |
| 3639 | { |
| 3640 | int r_type; |
| 3641 | reloc_howto_type *howto; |
| 3642 | unsigned long r_symndx; |
| 3643 | struct elf_link_hash_entry *h; |
| 3644 | Elf_Internal_Sym *sym; |
| 3645 | asection *sec; |
| 3646 | bfd_vma relocation; |
| 3647 | bfd_boolean unresolved_reloc; |
| 3648 | bfd_reloc_status_type r; |
| 3649 | |
| 3650 | r_type = ELF32_R_TYPE (rel->r_info); |
| 3651 | if (r_type < 0 || r_type >= (int) R_68K_max) |
| 3652 | { |
| 3653 | bfd_set_error (bfd_error_bad_value); |
| 3654 | return FALSE; |
| 3655 | } |
| 3656 | howto = howto_table + r_type; |
| 3657 | |
| 3658 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 3659 | |
| 3660 | h = NULL; |
| 3661 | sym = NULL; |
| 3662 | sec = NULL; |
| 3663 | unresolved_reloc = FALSE; |
| 3664 | |
| 3665 | if (r_symndx < symtab_hdr->sh_info) |
| 3666 | { |
| 3667 | sym = local_syms + r_symndx; |
| 3668 | sec = local_sections[r_symndx]; |
| 3669 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); |
| 3670 | } |
| 3671 | else |
| 3672 | { |
| 3673 | bfd_boolean warned; |
| 3674 | |
| 3675 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
| 3676 | r_symndx, symtab_hdr, sym_hashes, |
| 3677 | h, sec, relocation, |
| 3678 | unresolved_reloc, warned); |
| 3679 | } |
| 3680 | |
| 3681 | if (sec != NULL && discarded_section (sec)) |
| 3682 | RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, |
| 3683 | rel, 1, relend, howto, 0, contents); |
| 3684 | |
| 3685 | if (info->relocatable) |
| 3686 | continue; |
| 3687 | |
| 3688 | switch (r_type) |
| 3689 | { |
| 3690 | case R_68K_GOT8: |
| 3691 | case R_68K_GOT16: |
| 3692 | case R_68K_GOT32: |
| 3693 | /* Relocation is to the address of the entry for this symbol |
| 3694 | in the global offset table. */ |
| 3695 | if (h != NULL |
| 3696 | && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) |
| 3697 | { |
| 3698 | if (elf_m68k_hash_table (info)->local_gp_p) |
| 3699 | { |
| 3700 | bfd_vma sgot_output_offset; |
| 3701 | bfd_vma got_offset; |
| 3702 | |
| 3703 | if (sgot == NULL) |
| 3704 | { |
| 3705 | sgot = bfd_get_linker_section (dynobj, ".got"); |
| 3706 | |
| 3707 | if (sgot != NULL) |
| 3708 | sgot_output_offset = sgot->output_offset; |
| 3709 | else |
| 3710 | /* In this case we have a reference to |
| 3711 | _GLOBAL_OFFSET_TABLE_, but the GOT itself is |
| 3712 | empty. |
| 3713 | ??? Issue a warning? */ |
| 3714 | sgot_output_offset = 0; |
| 3715 | } |
| 3716 | else |
| 3717 | sgot_output_offset = sgot->output_offset; |
| 3718 | |
| 3719 | if (got == NULL) |
| 3720 | { |
| 3721 | struct elf_m68k_bfd2got_entry *bfd2got_entry; |
| 3722 | |
| 3723 | bfd2got_entry |
| 3724 | = elf_m68k_get_bfd2got_entry (elf_m68k_multi_got (info), |
| 3725 | input_bfd, SEARCH, NULL); |
| 3726 | |
| 3727 | if (bfd2got_entry != NULL) |
| 3728 | { |
| 3729 | got = bfd2got_entry->got; |
| 3730 | BFD_ASSERT (got != NULL); |
| 3731 | |
| 3732 | got_offset = got->offset; |
| 3733 | } |
| 3734 | else |
| 3735 | /* In this case we have a reference to |
| 3736 | _GLOBAL_OFFSET_TABLE_, but no other references |
| 3737 | accessing any GOT entries. |
| 3738 | ??? Issue a warning? */ |
| 3739 | got_offset = 0; |
| 3740 | } |
| 3741 | else |
| 3742 | got_offset = got->offset; |
| 3743 | |
| 3744 | /* Adjust GOT pointer to point to the GOT |
| 3745 | assigned to input_bfd. */ |
| 3746 | rel->r_addend += sgot_output_offset + got_offset; |
| 3747 | } |
| 3748 | else |
| 3749 | BFD_ASSERT (got == NULL || got->offset == 0); |
| 3750 | |
| 3751 | break; |
| 3752 | } |
| 3753 | /* Fall through. */ |
| 3754 | case R_68K_GOT8O: |
| 3755 | case R_68K_GOT16O: |
| 3756 | case R_68K_GOT32O: |
| 3757 | |
| 3758 | case R_68K_TLS_LDM32: |
| 3759 | case R_68K_TLS_LDM16: |
| 3760 | case R_68K_TLS_LDM8: |
| 3761 | |
| 3762 | case R_68K_TLS_GD8: |
| 3763 | case R_68K_TLS_GD16: |
| 3764 | case R_68K_TLS_GD32: |
| 3765 | |
| 3766 | case R_68K_TLS_IE8: |
| 3767 | case R_68K_TLS_IE16: |
| 3768 | case R_68K_TLS_IE32: |
| 3769 | |
| 3770 | /* Relocation is the offset of the entry for this symbol in |
| 3771 | the global offset table. */ |
| 3772 | |
| 3773 | { |
| 3774 | struct elf_m68k_got_entry_key key_; |
| 3775 | bfd_vma *off_ptr; |
| 3776 | bfd_vma off; |
| 3777 | |
| 3778 | if (sgot == NULL) |
| 3779 | { |
| 3780 | sgot = bfd_get_linker_section (dynobj, ".got"); |
| 3781 | BFD_ASSERT (sgot != NULL); |
| 3782 | } |
| 3783 | |
| 3784 | if (got == NULL) |
| 3785 | { |
| 3786 | got = elf_m68k_get_bfd2got_entry (elf_m68k_multi_got (info), |
| 3787 | input_bfd, MUST_FIND, |
| 3788 | NULL)->got; |
| 3789 | BFD_ASSERT (got != NULL); |
| 3790 | } |
| 3791 | |
| 3792 | /* Get GOT offset for this symbol. */ |
| 3793 | elf_m68k_init_got_entry_key (&key_, h, input_bfd, r_symndx, |
| 3794 | r_type); |
| 3795 | off_ptr = &elf_m68k_get_got_entry (got, &key_, MUST_FIND, |
| 3796 | NULL)->u.s2.offset; |
| 3797 | off = *off_ptr; |
| 3798 | |
| 3799 | /* The offset must always be a multiple of 4. We use |
| 3800 | the least significant bit to record whether we have |
| 3801 | already generated the necessary reloc. */ |
| 3802 | if ((off & 1) != 0) |
| 3803 | off &= ~1; |
| 3804 | else |
| 3805 | { |
| 3806 | if (h != NULL |
| 3807 | /* @TLSLDM relocations are bounded to the module, in |
| 3808 | which the symbol is defined -- not to the symbol |
| 3809 | itself. */ |
| 3810 | && elf_m68k_reloc_got_type (r_type) != R_68K_TLS_LDM32) |
| 3811 | { |
| 3812 | bfd_boolean dyn; |
| 3813 | |
| 3814 | dyn = elf_hash_table (info)->dynamic_sections_created; |
| 3815 | if (!WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) |
| 3816 | || (info->shared |
| 3817 | && SYMBOL_REFERENCES_LOCAL (info, h)) |
| 3818 | || (ELF_ST_VISIBILITY (h->other) |
| 3819 | && h->root.type == bfd_link_hash_undefweak)) |
| 3820 | { |
| 3821 | /* This is actually a static link, or it is a |
| 3822 | -Bsymbolic link and the symbol is defined |
| 3823 | locally, or the symbol was forced to be local |
| 3824 | because of a version file. We must initialize |
| 3825 | this entry in the global offset table. Since |
| 3826 | the offset must always be a multiple of 4, we |
| 3827 | use the least significant bit to record whether |
| 3828 | we have initialized it already. |
| 3829 | |
| 3830 | When doing a dynamic link, we create a .rela.got |
| 3831 | relocation entry to initialize the value. This |
| 3832 | is done in the finish_dynamic_symbol routine. */ |
| 3833 | |
| 3834 | elf_m68k_init_got_entry_static (info, |
| 3835 | output_bfd, |
| 3836 | r_type, |
| 3837 | sgot, |
| 3838 | off, |
| 3839 | relocation); |
| 3840 | |
| 3841 | *off_ptr |= 1; |
| 3842 | } |
| 3843 | else |
| 3844 | unresolved_reloc = FALSE; |
| 3845 | } |
| 3846 | else if (info->shared) /* && h == NULL */ |
| 3847 | /* Process local symbol during dynamic link. */ |
| 3848 | { |
| 3849 | if (srela == NULL) |
| 3850 | { |
| 3851 | srela = bfd_get_linker_section (dynobj, ".rela.got"); |
| 3852 | BFD_ASSERT (srela != NULL); |
| 3853 | } |
| 3854 | |
| 3855 | elf_m68k_init_got_entry_local_shared (info, |
| 3856 | output_bfd, |
| 3857 | r_type, |
| 3858 | sgot, |
| 3859 | off, |
| 3860 | relocation, |
| 3861 | srela); |
| 3862 | |
| 3863 | *off_ptr |= 1; |
| 3864 | } |
| 3865 | else /* h == NULL && !info->shared */ |
| 3866 | { |
| 3867 | elf_m68k_init_got_entry_static (info, |
| 3868 | output_bfd, |
| 3869 | r_type, |
| 3870 | sgot, |
| 3871 | off, |
| 3872 | relocation); |
| 3873 | |
| 3874 | *off_ptr |= 1; |
| 3875 | } |
| 3876 | } |
| 3877 | |
| 3878 | /* We don't use elf_m68k_reloc_got_type in the condition below |
| 3879 | because this is the only place where difference between |
| 3880 | R_68K_GOTx and R_68K_GOTxO relocations matters. */ |
| 3881 | if (r_type == R_68K_GOT32O |
| 3882 | || r_type == R_68K_GOT16O |
| 3883 | || r_type == R_68K_GOT8O |
| 3884 | || elf_m68k_reloc_got_type (r_type) == R_68K_TLS_GD32 |
| 3885 | || elf_m68k_reloc_got_type (r_type) == R_68K_TLS_LDM32 |
| 3886 | || elf_m68k_reloc_got_type (r_type) == R_68K_TLS_IE32) |
| 3887 | { |
| 3888 | /* GOT pointer is adjusted to point to the start/middle |
| 3889 | of local GOT. Adjust the offset accordingly. */ |
| 3890 | BFD_ASSERT (elf_m68k_hash_table (info)->use_neg_got_offsets_p |
| 3891 | || off >= got->offset); |
| 3892 | |
| 3893 | if (elf_m68k_hash_table (info)->local_gp_p) |
| 3894 | relocation = off - got->offset; |
| 3895 | else |
| 3896 | { |
| 3897 | BFD_ASSERT (got->offset == 0); |
| 3898 | relocation = sgot->output_offset + off; |
| 3899 | } |
| 3900 | |
| 3901 | /* This relocation does not use the addend. */ |
| 3902 | rel->r_addend = 0; |
| 3903 | } |
| 3904 | else |
| 3905 | relocation = (sgot->output_section->vma + sgot->output_offset |
| 3906 | + off); |
| 3907 | } |
| 3908 | break; |
| 3909 | |
| 3910 | case R_68K_TLS_LDO32: |
| 3911 | case R_68K_TLS_LDO16: |
| 3912 | case R_68K_TLS_LDO8: |
| 3913 | relocation -= dtpoff_base (info); |
| 3914 | break; |
| 3915 | |
| 3916 | case R_68K_TLS_LE32: |
| 3917 | case R_68K_TLS_LE16: |
| 3918 | case R_68K_TLS_LE8: |
| 3919 | if (info->shared && !info->pie) |
| 3920 | { |
| 3921 | (*_bfd_error_handler) |
| 3922 | (_("%B(%A+0x%lx): R_68K_TLS_LE32 relocation not permitted " |
| 3923 | "in shared object"), |
| 3924 | input_bfd, input_section, (long) rel->r_offset, howto->name); |
| 3925 | |
| 3926 | return FALSE; |
| 3927 | } |
| 3928 | else |
| 3929 | relocation -= tpoff_base (info); |
| 3930 | |
| 3931 | break; |
| 3932 | |
| 3933 | case R_68K_PLT8: |
| 3934 | case R_68K_PLT16: |
| 3935 | case R_68K_PLT32: |
| 3936 | /* Relocation is to the entry for this symbol in the |
| 3937 | procedure linkage table. */ |
| 3938 | |
| 3939 | /* Resolve a PLTxx reloc against a local symbol directly, |
| 3940 | without using the procedure linkage table. */ |
| 3941 | if (h == NULL) |
| 3942 | break; |
| 3943 | |
| 3944 | if (h->plt.offset == (bfd_vma) -1 |
| 3945 | || !elf_hash_table (info)->dynamic_sections_created) |
| 3946 | { |
| 3947 | /* We didn't make a PLT entry for this symbol. This |
| 3948 | happens when statically linking PIC code, or when |
| 3949 | using -Bsymbolic. */ |
| 3950 | break; |
| 3951 | } |
| 3952 | |
| 3953 | if (splt == NULL) |
| 3954 | { |
| 3955 | splt = bfd_get_linker_section (dynobj, ".plt"); |
| 3956 | BFD_ASSERT (splt != NULL); |
| 3957 | } |
| 3958 | |
| 3959 | relocation = (splt->output_section->vma |
| 3960 | + splt->output_offset |
| 3961 | + h->plt.offset); |
| 3962 | unresolved_reloc = FALSE; |
| 3963 | break; |
| 3964 | |
| 3965 | case R_68K_PLT8O: |
| 3966 | case R_68K_PLT16O: |
| 3967 | case R_68K_PLT32O: |
| 3968 | /* Relocation is the offset of the entry for this symbol in |
| 3969 | the procedure linkage table. */ |
| 3970 | BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1); |
| 3971 | |
| 3972 | if (splt == NULL) |
| 3973 | { |
| 3974 | splt = bfd_get_linker_section (dynobj, ".plt"); |
| 3975 | BFD_ASSERT (splt != NULL); |
| 3976 | } |
| 3977 | |
| 3978 | relocation = h->plt.offset; |
| 3979 | unresolved_reloc = FALSE; |
| 3980 | |
| 3981 | /* This relocation does not use the addend. */ |
| 3982 | rel->r_addend = 0; |
| 3983 | |
| 3984 | break; |
| 3985 | |
| 3986 | case R_68K_8: |
| 3987 | case R_68K_16: |
| 3988 | case R_68K_32: |
| 3989 | case R_68K_PC8: |
| 3990 | case R_68K_PC16: |
| 3991 | case R_68K_PC32: |
| 3992 | if (info->shared |
| 3993 | && r_symndx != STN_UNDEF |
| 3994 | && (input_section->flags & SEC_ALLOC) != 0 |
| 3995 | && (h == NULL |
| 3996 | || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
| 3997 | || h->root.type != bfd_link_hash_undefweak) |
| 3998 | && ((r_type != R_68K_PC8 |
| 3999 | && r_type != R_68K_PC16 |
| 4000 | && r_type != R_68K_PC32) |
| 4001 | || !SYMBOL_CALLS_LOCAL (info, h))) |
| 4002 | { |
| 4003 | Elf_Internal_Rela outrel; |
| 4004 | bfd_byte *loc; |
| 4005 | bfd_boolean skip, relocate; |
| 4006 | |
| 4007 | /* When generating a shared object, these relocations |
| 4008 | are copied into the output file to be resolved at run |
| 4009 | time. */ |
| 4010 | |
| 4011 | skip = FALSE; |
| 4012 | relocate = FALSE; |
| 4013 | |
| 4014 | outrel.r_offset = |
| 4015 | _bfd_elf_section_offset (output_bfd, info, input_section, |
| 4016 | rel->r_offset); |
| 4017 | if (outrel.r_offset == (bfd_vma) -1) |
| 4018 | skip = TRUE; |
| 4019 | else if (outrel.r_offset == (bfd_vma) -2) |
| 4020 | skip = TRUE, relocate = TRUE; |
| 4021 | outrel.r_offset += (input_section->output_section->vma |
| 4022 | + input_section->output_offset); |
| 4023 | |
| 4024 | if (skip) |
| 4025 | memset (&outrel, 0, sizeof outrel); |
| 4026 | else if (h != NULL |
| 4027 | && h->dynindx != -1 |
| 4028 | && (r_type == R_68K_PC8 |
| 4029 | || r_type == R_68K_PC16 |
| 4030 | || r_type == R_68K_PC32 |
| 4031 | || !info->shared |
| 4032 | || !info->symbolic |
| 4033 | || !h->def_regular)) |
| 4034 | { |
| 4035 | outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); |
| 4036 | outrel.r_addend = rel->r_addend; |
| 4037 | } |
| 4038 | else |
| 4039 | { |
| 4040 | /* This symbol is local, or marked to become local. */ |
| 4041 | outrel.r_addend = relocation + rel->r_addend; |
| 4042 | |
| 4043 | if (r_type == R_68K_32) |
| 4044 | { |
| 4045 | relocate = TRUE; |
| 4046 | outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE); |
| 4047 | } |
| 4048 | else |
| 4049 | { |
| 4050 | long indx; |
| 4051 | |
| 4052 | if (bfd_is_abs_section (sec)) |
| 4053 | indx = 0; |
| 4054 | else if (sec == NULL || sec->owner == NULL) |
| 4055 | { |
| 4056 | bfd_set_error (bfd_error_bad_value); |
| 4057 | return FALSE; |
| 4058 | } |
| 4059 | else |
| 4060 | { |
| 4061 | asection *osec; |
| 4062 | |
| 4063 | /* We are turning this relocation into one |
| 4064 | against a section symbol. It would be |
| 4065 | proper to subtract the symbol's value, |
| 4066 | osec->vma, from the emitted reloc addend, |
| 4067 | but ld.so expects buggy relocs. */ |
| 4068 | osec = sec->output_section; |
| 4069 | indx = elf_section_data (osec)->dynindx; |
| 4070 | if (indx == 0) |
| 4071 | { |
| 4072 | struct elf_link_hash_table *htab; |
| 4073 | htab = elf_hash_table (info); |
| 4074 | osec = htab->text_index_section; |
| 4075 | indx = elf_section_data (osec)->dynindx; |
| 4076 | } |
| 4077 | BFD_ASSERT (indx != 0); |
| 4078 | } |
| 4079 | |
| 4080 | outrel.r_info = ELF32_R_INFO (indx, r_type); |
| 4081 | } |
| 4082 | } |
| 4083 | |
| 4084 | sreloc = elf_section_data (input_section)->sreloc; |
| 4085 | if (sreloc == NULL) |
| 4086 | abort (); |
| 4087 | |
| 4088 | loc = sreloc->contents; |
| 4089 | loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); |
| 4090 | bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); |
| 4091 | |
| 4092 | /* This reloc will be computed at runtime, so there's no |
| 4093 | need to do anything now, except for R_68K_32 |
| 4094 | relocations that have been turned into |
| 4095 | R_68K_RELATIVE. */ |
| 4096 | if (!relocate) |
| 4097 | continue; |
| 4098 | } |
| 4099 | |
| 4100 | break; |
| 4101 | |
| 4102 | case R_68K_GNU_VTINHERIT: |
| 4103 | case R_68K_GNU_VTENTRY: |
| 4104 | /* These are no-ops in the end. */ |
| 4105 | continue; |
| 4106 | |
| 4107 | default: |
| 4108 | break; |
| 4109 | } |
| 4110 | |
| 4111 | /* Dynamic relocs are not propagated for SEC_DEBUGGING sections |
| 4112 | because such sections are not SEC_ALLOC and thus ld.so will |
| 4113 | not process them. */ |
| 4114 | if (unresolved_reloc |
| 4115 | && !((input_section->flags & SEC_DEBUGGING) != 0 |
| 4116 | && h->def_dynamic) |
| 4117 | && _bfd_elf_section_offset (output_bfd, info, input_section, |
| 4118 | rel->r_offset) != (bfd_vma) -1) |
| 4119 | { |
| 4120 | (*_bfd_error_handler) |
| 4121 | (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), |
| 4122 | input_bfd, |
| 4123 | input_section, |
| 4124 | (long) rel->r_offset, |
| 4125 | howto->name, |
| 4126 | h->root.root.string); |
| 4127 | return FALSE; |
| 4128 | } |
| 4129 | |
| 4130 | if (r_symndx != STN_UNDEF |
| 4131 | && r_type != R_68K_NONE |
| 4132 | && (h == NULL |
| 4133 | || h->root.type == bfd_link_hash_defined |
| 4134 | || h->root.type == bfd_link_hash_defweak)) |
| 4135 | { |
| 4136 | char sym_type; |
| 4137 | |
| 4138 | sym_type = (sym != NULL) ? ELF32_ST_TYPE (sym->st_info) : h->type; |
| 4139 | |
| 4140 | if (elf_m68k_reloc_tls_p (r_type) != (sym_type == STT_TLS)) |
| 4141 | { |
| 4142 | const char *name; |
| 4143 | |
| 4144 | if (h != NULL) |
| 4145 | name = h->root.root.string; |
| 4146 | else |
| 4147 | { |
| 4148 | name = (bfd_elf_string_from_elf_section |
| 4149 | (input_bfd, symtab_hdr->sh_link, sym->st_name)); |
| 4150 | if (name == NULL || *name == '\0') |
| 4151 | name = bfd_section_name (input_bfd, sec); |
| 4152 | } |
| 4153 | |
| 4154 | (*_bfd_error_handler) |
| 4155 | ((sym_type == STT_TLS |
| 4156 | ? _("%B(%A+0x%lx): %s used with TLS symbol %s") |
| 4157 | : _("%B(%A+0x%lx): %s used with non-TLS symbol %s")), |
| 4158 | input_bfd, |
| 4159 | input_section, |
| 4160 | (long) rel->r_offset, |
| 4161 | howto->name, |
| 4162 | name); |
| 4163 | } |
| 4164 | } |
| 4165 | |
| 4166 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 4167 | contents, rel->r_offset, |
| 4168 | relocation, rel->r_addend); |
| 4169 | |
| 4170 | if (r != bfd_reloc_ok) |
| 4171 | { |
| 4172 | const char *name; |
| 4173 | |
| 4174 | if (h != NULL) |
| 4175 | name = h->root.root.string; |
| 4176 | else |
| 4177 | { |
| 4178 | name = bfd_elf_string_from_elf_section (input_bfd, |
| 4179 | symtab_hdr->sh_link, |
| 4180 | sym->st_name); |
| 4181 | if (name == NULL) |
| 4182 | return FALSE; |
| 4183 | if (*name == '\0') |
| 4184 | name = bfd_section_name (input_bfd, sec); |
| 4185 | } |
| 4186 | |
| 4187 | if (r == bfd_reloc_overflow) |
| 4188 | { |
| 4189 | if (!(info->callbacks->reloc_overflow |
| 4190 | (info, (h ? &h->root : NULL), name, howto->name, |
| 4191 | (bfd_vma) 0, input_bfd, input_section, |
| 4192 | rel->r_offset))) |
| 4193 | return FALSE; |
| 4194 | } |
| 4195 | else |
| 4196 | { |
| 4197 | (*_bfd_error_handler) |
| 4198 | (_("%B(%A+0x%lx): reloc against `%s': error %d"), |
| 4199 | input_bfd, input_section, |
| 4200 | (long) rel->r_offset, name, (int) r); |
| 4201 | return FALSE; |
| 4202 | } |
| 4203 | } |
| 4204 | } |
| 4205 | |
| 4206 | return TRUE; |
| 4207 | } |
| 4208 | |
| 4209 | /* Install an M_68K_PC32 relocation against VALUE at offset OFFSET |
| 4210 | into section SEC. */ |
| 4211 | |
| 4212 | static void |
| 4213 | elf_m68k_install_pc32 (asection *sec, bfd_vma offset, bfd_vma value) |
| 4214 | { |
| 4215 | /* Make VALUE PC-relative. */ |
| 4216 | value -= sec->output_section->vma + offset; |
| 4217 | |
| 4218 | /* Apply any in-place addend. */ |
| 4219 | value += bfd_get_32 (sec->owner, sec->contents + offset); |
| 4220 | |
| 4221 | bfd_put_32 (sec->owner, value, sec->contents + offset); |
| 4222 | } |
| 4223 | |
| 4224 | /* Finish up dynamic symbol handling. We set the contents of various |
| 4225 | dynamic sections here. */ |
| 4226 | |
| 4227 | static bfd_boolean |
| 4228 | elf_m68k_finish_dynamic_symbol (bfd *output_bfd, |
| 4229 | struct bfd_link_info *info, |
| 4230 | struct elf_link_hash_entry *h, |
| 4231 | Elf_Internal_Sym *sym) |
| 4232 | { |
| 4233 | bfd *dynobj; |
| 4234 | |
| 4235 | dynobj = elf_hash_table (info)->dynobj; |
| 4236 | |
| 4237 | if (h->plt.offset != (bfd_vma) -1) |
| 4238 | { |
| 4239 | const struct elf_m68k_plt_info *plt_info; |
| 4240 | asection *splt; |
| 4241 | asection *sgot; |
| 4242 | asection *srela; |
| 4243 | bfd_vma plt_index; |
| 4244 | bfd_vma got_offset; |
| 4245 | Elf_Internal_Rela rela; |
| 4246 | bfd_byte *loc; |
| 4247 | |
| 4248 | /* This symbol has an entry in the procedure linkage table. Set |
| 4249 | it up. */ |
| 4250 | |
| 4251 | BFD_ASSERT (h->dynindx != -1); |
| 4252 | |
| 4253 | plt_info = elf_m68k_hash_table (info)->plt_info; |
| 4254 | splt = bfd_get_linker_section (dynobj, ".plt"); |
| 4255 | sgot = bfd_get_linker_section (dynobj, ".got.plt"); |
| 4256 | srela = bfd_get_linker_section (dynobj, ".rela.plt"); |
| 4257 | BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL); |
| 4258 | |
| 4259 | /* Get the index in the procedure linkage table which |
| 4260 | corresponds to this symbol. This is the index of this symbol |
| 4261 | in all the symbols for which we are making plt entries. The |
| 4262 | first entry in the procedure linkage table is reserved. */ |
| 4263 | plt_index = (h->plt.offset / plt_info->size) - 1; |
| 4264 | |
| 4265 | /* Get the offset into the .got table of the entry that |
| 4266 | corresponds to this function. Each .got entry is 4 bytes. |
| 4267 | The first three are reserved. */ |
| 4268 | got_offset = (plt_index + 3) * 4; |
| 4269 | |
| 4270 | memcpy (splt->contents + h->plt.offset, |
| 4271 | plt_info->symbol_entry, |
| 4272 | plt_info->size); |
| 4273 | |
| 4274 | elf_m68k_install_pc32 (splt, h->plt.offset + plt_info->symbol_relocs.got, |
| 4275 | (sgot->output_section->vma |
| 4276 | + sgot->output_offset |
| 4277 | + got_offset)); |
| 4278 | |
| 4279 | bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela), |
| 4280 | splt->contents |
| 4281 | + h->plt.offset |
| 4282 | + plt_info->symbol_resolve_entry + 2); |
| 4283 | |
| 4284 | elf_m68k_install_pc32 (splt, h->plt.offset + plt_info->symbol_relocs.plt, |
| 4285 | splt->output_section->vma); |
| 4286 | |
| 4287 | /* Fill in the entry in the global offset table. */ |
| 4288 | bfd_put_32 (output_bfd, |
| 4289 | (splt->output_section->vma |
| 4290 | + splt->output_offset |
| 4291 | + h->plt.offset |
| 4292 | + plt_info->symbol_resolve_entry), |
| 4293 | sgot->contents + got_offset); |
| 4294 | |
| 4295 | /* Fill in the entry in the .rela.plt section. */ |
| 4296 | rela.r_offset = (sgot->output_section->vma |
| 4297 | + sgot->output_offset |
| 4298 | + got_offset); |
| 4299 | rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT); |
| 4300 | rela.r_addend = 0; |
| 4301 | loc = srela->contents + plt_index * sizeof (Elf32_External_Rela); |
| 4302 | bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); |
| 4303 | |
| 4304 | if (!h->def_regular) |
| 4305 | { |
| 4306 | /* Mark the symbol as undefined, rather than as defined in |
| 4307 | the .plt section. Leave the value alone. */ |
| 4308 | sym->st_shndx = SHN_UNDEF; |
| 4309 | } |
| 4310 | } |
| 4311 | |
| 4312 | if (elf_m68k_hash_entry (h)->glist != NULL) |
| 4313 | { |
| 4314 | asection *sgot; |
| 4315 | asection *srela; |
| 4316 | struct elf_m68k_got_entry *got_entry; |
| 4317 | |
| 4318 | /* This symbol has an entry in the global offset table. Set it |
| 4319 | up. */ |
| 4320 | |
| 4321 | sgot = bfd_get_linker_section (dynobj, ".got"); |
| 4322 | srela = bfd_get_linker_section (dynobj, ".rela.got"); |
| 4323 | BFD_ASSERT (sgot != NULL && srela != NULL); |
| 4324 | |
| 4325 | got_entry = elf_m68k_hash_entry (h)->glist; |
| 4326 | |
| 4327 | while (got_entry != NULL) |
| 4328 | { |
| 4329 | enum elf_m68k_reloc_type r_type; |
| 4330 | bfd_vma got_entry_offset; |
| 4331 | |
| 4332 | r_type = got_entry->key_.type; |
| 4333 | got_entry_offset = got_entry->u.s2.offset &~ (bfd_vma) 1; |
| 4334 | |
| 4335 | /* If this is a -Bsymbolic link, and the symbol is defined |
| 4336 | locally, we just want to emit a RELATIVE reloc. Likewise if |
| 4337 | the symbol was forced to be local because of a version file. |
| 4338 | The entry in the global offset table already have been |
| 4339 | initialized in the relocate_section function. */ |
| 4340 | if (info->shared |
| 4341 | && SYMBOL_REFERENCES_LOCAL (info, h)) |
| 4342 | { |
| 4343 | bfd_vma relocation; |
| 4344 | |
| 4345 | relocation = bfd_get_signed_32 (output_bfd, |
| 4346 | (sgot->contents |
| 4347 | + got_entry_offset)); |
| 4348 | |
| 4349 | /* Undo TP bias. */ |
| 4350 | switch (elf_m68k_reloc_got_type (r_type)) |
| 4351 | { |
| 4352 | case R_68K_GOT32O: |
| 4353 | case R_68K_TLS_LDM32: |
| 4354 | break; |
| 4355 | |
| 4356 | case R_68K_TLS_GD32: |
| 4357 | /* The value for this relocation is actually put in |
| 4358 | the second GOT slot. */ |
| 4359 | relocation = bfd_get_signed_32 (output_bfd, |
| 4360 | (sgot->contents |
| 4361 | + got_entry_offset + 4)); |
| 4362 | relocation += dtpoff_base (info); |
| 4363 | break; |
| 4364 | |
| 4365 | case R_68K_TLS_IE32: |
| 4366 | relocation += tpoff_base (info); |
| 4367 | break; |
| 4368 | |
| 4369 | default: |
| 4370 | BFD_ASSERT (FALSE); |
| 4371 | } |
| 4372 | |
| 4373 | elf_m68k_init_got_entry_local_shared (info, |
| 4374 | output_bfd, |
| 4375 | r_type, |
| 4376 | sgot, |
| 4377 | got_entry_offset, |
| 4378 | relocation, |
| 4379 | srela); |
| 4380 | } |
| 4381 | else |
| 4382 | { |
| 4383 | Elf_Internal_Rela rela; |
| 4384 | |
| 4385 | /* Put zeros to GOT slots that will be initialized |
| 4386 | at run-time. */ |
| 4387 | { |
| 4388 | bfd_vma n_slots; |
| 4389 | |
| 4390 | n_slots = elf_m68k_reloc_got_n_slots (got_entry->key_.type); |
| 4391 | while (n_slots--) |
| 4392 | bfd_put_32 (output_bfd, (bfd_vma) 0, |
| 4393 | (sgot->contents + got_entry_offset |
| 4394 | + 4 * n_slots)); |
| 4395 | } |
| 4396 | |
| 4397 | rela.r_addend = 0; |
| 4398 | rela.r_offset = (sgot->output_section->vma |
| 4399 | + sgot->output_offset |
| 4400 | + got_entry_offset); |
| 4401 | |
| 4402 | switch (elf_m68k_reloc_got_type (r_type)) |
| 4403 | { |
| 4404 | case R_68K_GOT32O: |
| 4405 | rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT); |
| 4406 | elf_m68k_install_rela (output_bfd, srela, &rela); |
| 4407 | break; |
| 4408 | |
| 4409 | case R_68K_TLS_GD32: |
| 4410 | rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_TLS_DTPMOD32); |
| 4411 | elf_m68k_install_rela (output_bfd, srela, &rela); |
| 4412 | |
| 4413 | rela.r_offset += 4; |
| 4414 | rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_TLS_DTPREL32); |
| 4415 | elf_m68k_install_rela (output_bfd, srela, &rela); |
| 4416 | break; |
| 4417 | |
| 4418 | case R_68K_TLS_IE32: |
| 4419 | rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_TLS_TPREL32); |
| 4420 | elf_m68k_install_rela (output_bfd, srela, &rela); |
| 4421 | break; |
| 4422 | |
| 4423 | default: |
| 4424 | BFD_ASSERT (FALSE); |
| 4425 | break; |
| 4426 | } |
| 4427 | } |
| 4428 | |
| 4429 | got_entry = got_entry->u.s2.next; |
| 4430 | } |
| 4431 | } |
| 4432 | |
| 4433 | if (h->needs_copy) |
| 4434 | { |
| 4435 | asection *s; |
| 4436 | Elf_Internal_Rela rela; |
| 4437 | bfd_byte *loc; |
| 4438 | |
| 4439 | /* This symbol needs a copy reloc. Set it up. */ |
| 4440 | |
| 4441 | BFD_ASSERT (h->dynindx != -1 |
| 4442 | && (h->root.type == bfd_link_hash_defined |
| 4443 | || h->root.type == bfd_link_hash_defweak)); |
| 4444 | |
| 4445 | s = bfd_get_linker_section (dynobj, ".rela.bss"); |
| 4446 | BFD_ASSERT (s != NULL); |
| 4447 | |
| 4448 | rela.r_offset = (h->root.u.def.value |
| 4449 | + h->root.u.def.section->output_section->vma |
| 4450 | + h->root.u.def.section->output_offset); |
| 4451 | rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY); |
| 4452 | rela.r_addend = 0; |
| 4453 | loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela); |
| 4454 | bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); |
| 4455 | } |
| 4456 | |
| 4457 | return TRUE; |
| 4458 | } |
| 4459 | |
| 4460 | /* Finish up the dynamic sections. */ |
| 4461 | |
| 4462 | static bfd_boolean |
| 4463 | elf_m68k_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) |
| 4464 | { |
| 4465 | bfd *dynobj; |
| 4466 | asection *sgot; |
| 4467 | asection *sdyn; |
| 4468 | |
| 4469 | dynobj = elf_hash_table (info)->dynobj; |
| 4470 | |
| 4471 | sgot = bfd_get_linker_section (dynobj, ".got.plt"); |
| 4472 | BFD_ASSERT (sgot != NULL); |
| 4473 | sdyn = bfd_get_linker_section (dynobj, ".dynamic"); |
| 4474 | |
| 4475 | if (elf_hash_table (info)->dynamic_sections_created) |
| 4476 | { |
| 4477 | asection *splt; |
| 4478 | Elf32_External_Dyn *dyncon, *dynconend; |
| 4479 | |
| 4480 | splt = bfd_get_linker_section (dynobj, ".plt"); |
| 4481 | BFD_ASSERT (splt != NULL && sdyn != NULL); |
| 4482 | |
| 4483 | dyncon = (Elf32_External_Dyn *) sdyn->contents; |
| 4484 | dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); |
| 4485 | for (; dyncon < dynconend; dyncon++) |
| 4486 | { |
| 4487 | Elf_Internal_Dyn dyn; |
| 4488 | const char *name; |
| 4489 | asection *s; |
| 4490 | |
| 4491 | bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); |
| 4492 | |
| 4493 | switch (dyn.d_tag) |
| 4494 | { |
| 4495 | default: |
| 4496 | break; |
| 4497 | |
| 4498 | case DT_PLTGOT: |
| 4499 | name = ".got"; |
| 4500 | goto get_vma; |
| 4501 | case DT_JMPREL: |
| 4502 | name = ".rela.plt"; |
| 4503 | get_vma: |
| 4504 | s = bfd_get_section_by_name (output_bfd, name); |
| 4505 | BFD_ASSERT (s != NULL); |
| 4506 | dyn.d_un.d_ptr = s->vma; |
| 4507 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 4508 | break; |
| 4509 | |
| 4510 | case DT_PLTRELSZ: |
| 4511 | s = bfd_get_section_by_name (output_bfd, ".rela.plt"); |
| 4512 | BFD_ASSERT (s != NULL); |
| 4513 | dyn.d_un.d_val = s->size; |
| 4514 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 4515 | break; |
| 4516 | |
| 4517 | case DT_RELASZ: |
| 4518 | /* The procedure linkage table relocs (DT_JMPREL) should |
| 4519 | not be included in the overall relocs (DT_RELA). |
| 4520 | Therefore, we override the DT_RELASZ entry here to |
| 4521 | make it not include the JMPREL relocs. Since the |
| 4522 | linker script arranges for .rela.plt to follow all |
| 4523 | other relocation sections, we don't have to worry |
| 4524 | about changing the DT_RELA entry. */ |
| 4525 | s = bfd_get_section_by_name (output_bfd, ".rela.plt"); |
| 4526 | if (s != NULL) |
| 4527 | dyn.d_un.d_val -= s->size; |
| 4528 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 4529 | break; |
| 4530 | } |
| 4531 | } |
| 4532 | |
| 4533 | /* Fill in the first entry in the procedure linkage table. */ |
| 4534 | if (splt->size > 0) |
| 4535 | { |
| 4536 | const struct elf_m68k_plt_info *plt_info; |
| 4537 | |
| 4538 | plt_info = elf_m68k_hash_table (info)->plt_info; |
| 4539 | memcpy (splt->contents, plt_info->plt0_entry, plt_info->size); |
| 4540 | |
| 4541 | elf_m68k_install_pc32 (splt, plt_info->plt0_relocs.got4, |
| 4542 | (sgot->output_section->vma |
| 4543 | + sgot->output_offset |
| 4544 | + 4)); |
| 4545 | |
| 4546 | elf_m68k_install_pc32 (splt, plt_info->plt0_relocs.got8, |
| 4547 | (sgot->output_section->vma |
| 4548 | + sgot->output_offset |
| 4549 | + 8)); |
| 4550 | |
| 4551 | elf_section_data (splt->output_section)->this_hdr.sh_entsize |
| 4552 | = plt_info->size; |
| 4553 | } |
| 4554 | } |
| 4555 | |
| 4556 | /* Fill in the first three entries in the global offset table. */ |
| 4557 | if (sgot->size > 0) |
| 4558 | { |
| 4559 | if (sdyn == NULL) |
| 4560 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); |
| 4561 | else |
| 4562 | bfd_put_32 (output_bfd, |
| 4563 | sdyn->output_section->vma + sdyn->output_offset, |
| 4564 | sgot->contents); |
| 4565 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); |
| 4566 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); |
| 4567 | } |
| 4568 | |
| 4569 | elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; |
| 4570 | |
| 4571 | return TRUE; |
| 4572 | } |
| 4573 | |
| 4574 | /* Given a .data section and a .emreloc in-memory section, store |
| 4575 | relocation information into the .emreloc section which can be |
| 4576 | used at runtime to relocate the section. This is called by the |
| 4577 | linker when the --embedded-relocs switch is used. This is called |
| 4578 | after the add_symbols entry point has been called for all the |
| 4579 | objects, and before the final_link entry point is called. */ |
| 4580 | |
| 4581 | bfd_boolean |
| 4582 | bfd_m68k_elf32_create_embedded_relocs (abfd, info, datasec, relsec, errmsg) |
| 4583 | bfd *abfd; |
| 4584 | struct bfd_link_info *info; |
| 4585 | asection *datasec; |
| 4586 | asection *relsec; |
| 4587 | char **errmsg; |
| 4588 | { |
| 4589 | Elf_Internal_Shdr *symtab_hdr; |
| 4590 | Elf_Internal_Sym *isymbuf = NULL; |
| 4591 | Elf_Internal_Rela *internal_relocs = NULL; |
| 4592 | Elf_Internal_Rela *irel, *irelend; |
| 4593 | bfd_byte *p; |
| 4594 | bfd_size_type amt; |
| 4595 | |
| 4596 | BFD_ASSERT (! info->relocatable); |
| 4597 | |
| 4598 | *errmsg = NULL; |
| 4599 | |
| 4600 | if (datasec->reloc_count == 0) |
| 4601 | return TRUE; |
| 4602 | |
| 4603 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 4604 | |
| 4605 | /* Get a copy of the native relocations. */ |
| 4606 | internal_relocs = (_bfd_elf_link_read_relocs |
| 4607 | (abfd, datasec, NULL, (Elf_Internal_Rela *) NULL, |
| 4608 | info->keep_memory)); |
| 4609 | if (internal_relocs == NULL) |
| 4610 | goto error_return; |
| 4611 | |
| 4612 | amt = (bfd_size_type) datasec->reloc_count * 12; |
| 4613 | relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt); |
| 4614 | if (relsec->contents == NULL) |
| 4615 | goto error_return; |
| 4616 | |
| 4617 | p = relsec->contents; |
| 4618 | |
| 4619 | irelend = internal_relocs + datasec->reloc_count; |
| 4620 | for (irel = internal_relocs; irel < irelend; irel++, p += 12) |
| 4621 | { |
| 4622 | asection *targetsec; |
| 4623 | |
| 4624 | /* We are going to write a four byte longword into the runtime |
| 4625 | reloc section. The longword will be the address in the data |
| 4626 | section which must be relocated. It is followed by the name |
| 4627 | of the target section NUL-padded or truncated to 8 |
| 4628 | characters. */ |
| 4629 | |
| 4630 | /* We can only relocate absolute longword relocs at run time. */ |
| 4631 | if (ELF32_R_TYPE (irel->r_info) != (int) R_68K_32) |
| 4632 | { |
| 4633 | *errmsg = _("unsupported reloc type"); |
| 4634 | bfd_set_error (bfd_error_bad_value); |
| 4635 | goto error_return; |
| 4636 | } |
| 4637 | |
| 4638 | /* Get the target section referred to by the reloc. */ |
| 4639 | if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) |
| 4640 | { |
| 4641 | /* A local symbol. */ |
| 4642 | Elf_Internal_Sym *isym; |
| 4643 | |
| 4644 | /* Read this BFD's local symbols if we haven't done so already. */ |
| 4645 | if (isymbuf == NULL) |
| 4646 | { |
| 4647 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 4648 | if (isymbuf == NULL) |
| 4649 | isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, |
| 4650 | symtab_hdr->sh_info, 0, |
| 4651 | NULL, NULL, NULL); |
| 4652 | if (isymbuf == NULL) |
| 4653 | goto error_return; |
| 4654 | } |
| 4655 | |
| 4656 | isym = isymbuf + ELF32_R_SYM (irel->r_info); |
| 4657 | targetsec = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| 4658 | } |
| 4659 | else |
| 4660 | { |
| 4661 | unsigned long indx; |
| 4662 | struct elf_link_hash_entry *h; |
| 4663 | |
| 4664 | /* An external symbol. */ |
| 4665 | indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; |
| 4666 | h = elf_sym_hashes (abfd)[indx]; |
| 4667 | BFD_ASSERT (h != NULL); |
| 4668 | if (h->root.type == bfd_link_hash_defined |
| 4669 | || h->root.type == bfd_link_hash_defweak) |
| 4670 | targetsec = h->root.u.def.section; |
| 4671 | else |
| 4672 | targetsec = NULL; |
| 4673 | } |
| 4674 | |
| 4675 | bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p); |
| 4676 | memset (p + 4, 0, 8); |
| 4677 | if (targetsec != NULL) |
| 4678 | strncpy ((char *) p + 4, targetsec->output_section->name, 8); |
| 4679 | } |
| 4680 | |
| 4681 | if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) |
| 4682 | free (isymbuf); |
| 4683 | if (internal_relocs != NULL |
| 4684 | && elf_section_data (datasec)->relocs != internal_relocs) |
| 4685 | free (internal_relocs); |
| 4686 | return TRUE; |
| 4687 | |
| 4688 | error_return: |
| 4689 | if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) |
| 4690 | free (isymbuf); |
| 4691 | if (internal_relocs != NULL |
| 4692 | && elf_section_data (datasec)->relocs != internal_relocs) |
| 4693 | free (internal_relocs); |
| 4694 | return FALSE; |
| 4695 | } |
| 4696 | |
| 4697 | /* Set target options. */ |
| 4698 | |
| 4699 | void |
| 4700 | bfd_elf_m68k_set_target_options (struct bfd_link_info *info, int got_handling) |
| 4701 | { |
| 4702 | struct elf_m68k_link_hash_table *htab; |
| 4703 | bfd_boolean use_neg_got_offsets_p; |
| 4704 | bfd_boolean allow_multigot_p; |
| 4705 | bfd_boolean local_gp_p; |
| 4706 | |
| 4707 | switch (got_handling) |
| 4708 | { |
| 4709 | case 0: |
| 4710 | /* --got=single. */ |
| 4711 | local_gp_p = FALSE; |
| 4712 | use_neg_got_offsets_p = FALSE; |
| 4713 | allow_multigot_p = FALSE; |
| 4714 | break; |
| 4715 | |
| 4716 | case 1: |
| 4717 | /* --got=negative. */ |
| 4718 | local_gp_p = TRUE; |
| 4719 | use_neg_got_offsets_p = TRUE; |
| 4720 | allow_multigot_p = FALSE; |
| 4721 | break; |
| 4722 | |
| 4723 | case 2: |
| 4724 | /* --got=multigot. */ |
| 4725 | local_gp_p = TRUE; |
| 4726 | use_neg_got_offsets_p = TRUE; |
| 4727 | allow_multigot_p = TRUE; |
| 4728 | break; |
| 4729 | |
| 4730 | default: |
| 4731 | BFD_ASSERT (FALSE); |
| 4732 | return; |
| 4733 | } |
| 4734 | |
| 4735 | htab = elf_m68k_hash_table (info); |
| 4736 | if (htab != NULL) |
| 4737 | { |
| 4738 | htab->local_gp_p = local_gp_p; |
| 4739 | htab->use_neg_got_offsets_p = use_neg_got_offsets_p; |
| 4740 | htab->allow_multigot_p = allow_multigot_p; |
| 4741 | } |
| 4742 | } |
| 4743 | |
| 4744 | static enum elf_reloc_type_class |
| 4745 | elf32_m68k_reloc_type_class (const Elf_Internal_Rela *rela) |
| 4746 | { |
| 4747 | switch ((int) ELF32_R_TYPE (rela->r_info)) |
| 4748 | { |
| 4749 | case R_68K_RELATIVE: |
| 4750 | return reloc_class_relative; |
| 4751 | case R_68K_JMP_SLOT: |
| 4752 | return reloc_class_plt; |
| 4753 | case R_68K_COPY: |
| 4754 | return reloc_class_copy; |
| 4755 | default: |
| 4756 | return reloc_class_normal; |
| 4757 | } |
| 4758 | } |
| 4759 | |
| 4760 | /* Return address for Ith PLT stub in section PLT, for relocation REL |
| 4761 | or (bfd_vma) -1 if it should not be included. */ |
| 4762 | |
| 4763 | static bfd_vma |
| 4764 | elf_m68k_plt_sym_val (bfd_vma i, const asection *plt, |
| 4765 | const arelent *rel ATTRIBUTE_UNUSED) |
| 4766 | { |
| 4767 | return plt->vma + (i + 1) * elf_m68k_get_plt_info (plt->owner)->size; |
| 4768 | } |
| 4769 | |
| 4770 | /* Support for core dump NOTE sections. */ |
| 4771 | |
| 4772 | static bfd_boolean |
| 4773 | elf_m68k_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) |
| 4774 | { |
| 4775 | int offset; |
| 4776 | size_t size; |
| 4777 | |
| 4778 | switch (note->descsz) |
| 4779 | { |
| 4780 | default: |
| 4781 | return FALSE; |
| 4782 | |
| 4783 | case 154: /* Linux/m68k */ |
| 4784 | /* pr_cursig */ |
| 4785 | elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12); |
| 4786 | |
| 4787 | /* pr_pid */ |
| 4788 | elf_tdata (abfd)->core_lwpid = bfd_get_32 (abfd, note->descdata + 22); |
| 4789 | |
| 4790 | /* pr_reg */ |
| 4791 | offset = 70; |
| 4792 | size = 80; |
| 4793 | |
| 4794 | break; |
| 4795 | } |
| 4796 | |
| 4797 | /* Make a ".reg/999" section. */ |
| 4798 | return _bfd_elfcore_make_pseudosection (abfd, ".reg", |
| 4799 | size, note->descpos + offset); |
| 4800 | } |
| 4801 | |
| 4802 | static bfd_boolean |
| 4803 | elf_m68k_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) |
| 4804 | { |
| 4805 | switch (note->descsz) |
| 4806 | { |
| 4807 | default: |
| 4808 | return FALSE; |
| 4809 | |
| 4810 | case 124: /* Linux/m68k elf_prpsinfo. */ |
| 4811 | elf_tdata (abfd)->core_pid |
| 4812 | = bfd_get_32 (abfd, note->descdata + 12); |
| 4813 | elf_tdata (abfd)->core_program |
| 4814 | = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); |
| 4815 | elf_tdata (abfd)->core_command |
| 4816 | = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); |
| 4817 | } |
| 4818 | |
| 4819 | /* Note that for some reason, a spurious space is tacked |
| 4820 | onto the end of the args in some (at least one anyway) |
| 4821 | implementations, so strip it off if it exists. */ |
| 4822 | { |
| 4823 | char *command = elf_tdata (abfd)->core_command; |
| 4824 | int n = strlen (command); |
| 4825 | |
| 4826 | if (n > 0 && command[n - 1] == ' ') |
| 4827 | command[n - 1] = '\0'; |
| 4828 | } |
| 4829 | |
| 4830 | return TRUE; |
| 4831 | } |
| 4832 | |
| 4833 | #define TARGET_BIG_SYM bfd_elf32_m68k_vec |
| 4834 | #define TARGET_BIG_NAME "elf32-m68k" |
| 4835 | #define ELF_MACHINE_CODE EM_68K |
| 4836 | #define ELF_MAXPAGESIZE 0x2000 |
| 4837 | #define elf_backend_create_dynamic_sections \ |
| 4838 | _bfd_elf_create_dynamic_sections |
| 4839 | #define bfd_elf32_bfd_link_hash_table_create \ |
| 4840 | elf_m68k_link_hash_table_create |
| 4841 | /* ??? Should it be this macro or bfd_elfNN_bfd_link_hash_table_create? */ |
| 4842 | #define bfd_elf32_bfd_link_hash_table_free \ |
| 4843 | elf_m68k_link_hash_table_free |
| 4844 | #define bfd_elf32_bfd_final_link bfd_elf_final_link |
| 4845 | |
| 4846 | #define elf_backend_check_relocs elf_m68k_check_relocs |
| 4847 | #define elf_backend_always_size_sections \ |
| 4848 | elf_m68k_always_size_sections |
| 4849 | #define elf_backend_adjust_dynamic_symbol \ |
| 4850 | elf_m68k_adjust_dynamic_symbol |
| 4851 | #define elf_backend_size_dynamic_sections \ |
| 4852 | elf_m68k_size_dynamic_sections |
| 4853 | #define elf_backend_final_write_processing elf_m68k_final_write_processing |
| 4854 | #define elf_backend_init_index_section _bfd_elf_init_1_index_section |
| 4855 | #define elf_backend_relocate_section elf_m68k_relocate_section |
| 4856 | #define elf_backend_finish_dynamic_symbol \ |
| 4857 | elf_m68k_finish_dynamic_symbol |
| 4858 | #define elf_backend_finish_dynamic_sections \ |
| 4859 | elf_m68k_finish_dynamic_sections |
| 4860 | #define elf_backend_gc_mark_hook elf_m68k_gc_mark_hook |
| 4861 | #define elf_backend_gc_sweep_hook elf_m68k_gc_sweep_hook |
| 4862 | #define elf_backend_copy_indirect_symbol elf_m68k_copy_indirect_symbol |
| 4863 | #define bfd_elf32_bfd_merge_private_bfd_data \ |
| 4864 | elf32_m68k_merge_private_bfd_data |
| 4865 | #define bfd_elf32_bfd_set_private_flags \ |
| 4866 | elf32_m68k_set_private_flags |
| 4867 | #define bfd_elf32_bfd_print_private_bfd_data \ |
| 4868 | elf32_m68k_print_private_bfd_data |
| 4869 | #define elf_backend_reloc_type_class elf32_m68k_reloc_type_class |
| 4870 | #define elf_backend_plt_sym_val elf_m68k_plt_sym_val |
| 4871 | #define elf_backend_object_p elf32_m68k_object_p |
| 4872 | #define elf_backend_grok_prstatus elf_m68k_grok_prstatus |
| 4873 | #define elf_backend_grok_psinfo elf_m68k_grok_psinfo |
| 4874 | |
| 4875 | #define elf_backend_can_gc_sections 1 |
| 4876 | #define elf_backend_can_refcount 1 |
| 4877 | #define elf_backend_want_got_plt 1 |
| 4878 | #define elf_backend_plt_readonly 1 |
| 4879 | #define elf_backend_want_plt_sym 0 |
| 4880 | #define elf_backend_got_header_size 12 |
| 4881 | #define elf_backend_rela_normal 1 |
| 4882 | |
| 4883 | #include "elf32-target.h" |