| 1 | /* Hitachi SH specific support for 32-bit ELF |
| 2 | Copyright 1996, 1997, 1998 Free Software Foundation, Inc. |
| 3 | Contributed by Ian Lance Taylor, Cygnus Support. |
| 4 | |
| 5 | This file is part of BFD, the Binary File Descriptor library. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 20 | |
| 21 | #include "bfd.h" |
| 22 | #include "sysdep.h" |
| 23 | #include "bfdlink.h" |
| 24 | #include "libbfd.h" |
| 25 | #include "elf-bfd.h" |
| 26 | #include "elf/sh.h" |
| 27 | |
| 28 | static bfd_reloc_status_type sh_elf_reloc |
| 29 | PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); |
| 30 | static bfd_reloc_status_type sh_elf_ignore_reloc |
| 31 | PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); |
| 32 | static reloc_howto_type *sh_elf_reloc_type_lookup |
| 33 | PARAMS ((bfd *, bfd_reloc_code_real_type)); |
| 34 | static void sh_elf_info_to_howto |
| 35 | PARAMS ((bfd *, arelent *, Elf_Internal_Rela *)); |
| 36 | static boolean sh_elf_relax_section |
| 37 | PARAMS ((bfd *, asection *, struct bfd_link_info *, boolean *)); |
| 38 | static boolean sh_elf_relax_delete_bytes |
| 39 | PARAMS ((bfd *, asection *, bfd_vma, int)); |
| 40 | static boolean sh_elf_align_loads |
| 41 | PARAMS ((bfd *, asection *, Elf_Internal_Rela *, bfd_byte *, boolean *)); |
| 42 | static boolean sh_elf_swap_insns |
| 43 | PARAMS ((bfd *, asection *, PTR, bfd_byte *, bfd_vma)); |
| 44 | static boolean sh_elf_relocate_section |
| 45 | PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, |
| 46 | Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); |
| 47 | static bfd_byte *sh_elf_get_relocated_section_contents |
| 48 | PARAMS ((bfd *, struct bfd_link_info *, struct bfd_link_order *, |
| 49 | bfd_byte *, boolean, asymbol **)); |
| 50 | |
| 51 | static reloc_howto_type sh_elf_howto_table[] = |
| 52 | { |
| 53 | /* No relocation. */ |
| 54 | HOWTO (R_SH_NONE, /* type */ |
| 55 | 0, /* rightshift */ |
| 56 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 57 | 0, /* bitsize */ |
| 58 | false, /* pc_relative */ |
| 59 | 0, /* bitpos */ |
| 60 | complain_overflow_dont, /* complain_on_overflow */ |
| 61 | sh_elf_reloc, /* special_function */ |
| 62 | "R_SH_NONE", /* name */ |
| 63 | false, /* partial_inplace */ |
| 64 | 0, /* src_mask */ |
| 65 | 0, /* dst_mask */ |
| 66 | false), /* pcrel_offset */ |
| 67 | |
| 68 | /* 32 bit absolute relocation. Setting partial_inplace to true and |
| 69 | src_mask to a non-zero value is similar to the COFF toolchain. */ |
| 70 | HOWTO (R_SH_DIR32, /* type */ |
| 71 | 0, /* rightshift */ |
| 72 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 73 | 32, /* bitsize */ |
| 74 | false, /* pc_relative */ |
| 75 | 0, /* bitpos */ |
| 76 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 77 | sh_elf_reloc, /* special_function */ |
| 78 | "R_SH_DIR32", /* name */ |
| 79 | true, /* partial_inplace */ |
| 80 | 0xffffffff, /* src_mask */ |
| 81 | 0xffffffff, /* dst_mask */ |
| 82 | false), /* pcrel_offset */ |
| 83 | |
| 84 | /* 32 bit PC relative relocation. */ |
| 85 | HOWTO (R_SH_REL32, /* type */ |
| 86 | 0, /* rightshift */ |
| 87 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 88 | 32, /* bitsize */ |
| 89 | true, /* pc_relative */ |
| 90 | 0, /* bitpos */ |
| 91 | complain_overflow_signed, /* complain_on_overflow */ |
| 92 | sh_elf_reloc, /* special_function */ |
| 93 | "R_SH_REL32", /* name */ |
| 94 | false, /* partial_inplace */ |
| 95 | 0, /* src_mask */ |
| 96 | 0xffffffff, /* dst_mask */ |
| 97 | true), /* pcrel_offset */ |
| 98 | |
| 99 | /* 8 bit PC relative branch divided by 2. */ |
| 100 | HOWTO (R_SH_DIR8WPN, /* type */ |
| 101 | 1, /* rightshift */ |
| 102 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 103 | 8, /* bitsize */ |
| 104 | true, /* pc_relative */ |
| 105 | 0, /* bitpos */ |
| 106 | complain_overflow_signed, /* complain_on_overflow */ |
| 107 | sh_elf_reloc, /* special_function */ |
| 108 | "R_SH_DIR8WPN", /* name */ |
| 109 | true, /* partial_inplace */ |
| 110 | 0xff, /* src_mask */ |
| 111 | 0xff, /* dst_mask */ |
| 112 | true), /* pcrel_offset */ |
| 113 | |
| 114 | /* 12 bit PC relative branch divided by 2. */ |
| 115 | HOWTO (R_SH_IND12W, /* type */ |
| 116 | 1, /* rightshift */ |
| 117 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 118 | 12, /* bitsize */ |
| 119 | true, /* pc_relative */ |
| 120 | 0, /* bitpos */ |
| 121 | complain_overflow_signed, /* complain_on_overflow */ |
| 122 | sh_elf_reloc, /* special_function */ |
| 123 | "R_SH_IND12W", /* name */ |
| 124 | true, /* partial_inplace */ |
| 125 | 0xfff, /* src_mask */ |
| 126 | 0xfff, /* dst_mask */ |
| 127 | true), /* pcrel_offset */ |
| 128 | |
| 129 | /* 8 bit unsigned PC relative divided by 4. */ |
| 130 | HOWTO (R_SH_DIR8WPL, /* type */ |
| 131 | 2, /* rightshift */ |
| 132 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 133 | 8, /* bitsize */ |
| 134 | true, /* pc_relative */ |
| 135 | 0, /* bitpos */ |
| 136 | complain_overflow_unsigned, /* complain_on_overflow */ |
| 137 | sh_elf_reloc, /* special_function */ |
| 138 | "R_SH_DIR8WPL", /* name */ |
| 139 | true, /* partial_inplace */ |
| 140 | 0xff, /* src_mask */ |
| 141 | 0xff, /* dst_mask */ |
| 142 | true), /* pcrel_offset */ |
| 143 | |
| 144 | /* 8 bit unsigned PC relative divided by 2. */ |
| 145 | HOWTO (R_SH_DIR8WPZ, /* type */ |
| 146 | 1, /* rightshift */ |
| 147 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 148 | 8, /* bitsize */ |
| 149 | true, /* pc_relative */ |
| 150 | 0, /* bitpos */ |
| 151 | complain_overflow_unsigned, /* complain_on_overflow */ |
| 152 | sh_elf_reloc, /* special_function */ |
| 153 | "R_SH_DIR8WPZ", /* name */ |
| 154 | true, /* partial_inplace */ |
| 155 | 0xff, /* src_mask */ |
| 156 | 0xff, /* dst_mask */ |
| 157 | true), /* pcrel_offset */ |
| 158 | |
| 159 | /* 8 bit GBR relative. FIXME: This only makes sense if we have some |
| 160 | special symbol for the GBR relative area, and that is not |
| 161 | implemented. */ |
| 162 | HOWTO (R_SH_DIR8BP, /* type */ |
| 163 | 0, /* rightshift */ |
| 164 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 165 | 8, /* bitsize */ |
| 166 | false, /* pc_relative */ |
| 167 | 0, /* bitpos */ |
| 168 | complain_overflow_unsigned, /* complain_on_overflow */ |
| 169 | sh_elf_reloc, /* special_function */ |
| 170 | "R_SH_DIR8BP", /* name */ |
| 171 | false, /* partial_inplace */ |
| 172 | 0, /* src_mask */ |
| 173 | 0xff, /* dst_mask */ |
| 174 | true), /* pcrel_offset */ |
| 175 | |
| 176 | /* 8 bit GBR relative divided by 2. FIXME: This only makes sense if |
| 177 | we have some special symbol for the GBR relative area, and that |
| 178 | is not implemented. */ |
| 179 | HOWTO (R_SH_DIR8W, /* type */ |
| 180 | 1, /* rightshift */ |
| 181 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 182 | 8, /* bitsize */ |
| 183 | false, /* pc_relative */ |
| 184 | 0, /* bitpos */ |
| 185 | complain_overflow_unsigned, /* complain_on_overflow */ |
| 186 | sh_elf_reloc, /* special_function */ |
| 187 | "R_SH_DIR8W", /* name */ |
| 188 | false, /* partial_inplace */ |
| 189 | 0, /* src_mask */ |
| 190 | 0xff, /* dst_mask */ |
| 191 | true), /* pcrel_offset */ |
| 192 | |
| 193 | /* 8 bit GBR relative divided by 4. FIXME: This only makes sense if |
| 194 | we have some special symbol for the GBR relative area, and that |
| 195 | is not implemented. */ |
| 196 | HOWTO (R_SH_DIR8L, /* type */ |
| 197 | 2, /* rightshift */ |
| 198 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 199 | 8, /* bitsize */ |
| 200 | false, /* pc_relative */ |
| 201 | 0, /* bitpos */ |
| 202 | complain_overflow_unsigned, /* complain_on_overflow */ |
| 203 | sh_elf_reloc, /* special_function */ |
| 204 | "R_SH_DIR8L", /* name */ |
| 205 | false, /* partial_inplace */ |
| 206 | 0, /* src_mask */ |
| 207 | 0xff, /* dst_mask */ |
| 208 | true), /* pcrel_offset */ |
| 209 | |
| 210 | { 10 }, |
| 211 | { 11 }, |
| 212 | { 12 }, |
| 213 | { 13 }, |
| 214 | { 14 }, |
| 215 | { 15 }, |
| 216 | { 16 }, |
| 217 | { 17 }, |
| 218 | { 18 }, |
| 219 | { 19 }, |
| 220 | { 20 }, |
| 221 | { 21 }, |
| 222 | { 22 }, |
| 223 | { 23 }, |
| 224 | { 24 }, |
| 225 | |
| 226 | /* The remaining relocs are a GNU extension used for relaxing. The |
| 227 | final pass of the linker never needs to do anything with any of |
| 228 | these relocs. Any required operations are handled by the |
| 229 | relaxation code. */ |
| 230 | |
| 231 | /* A 16 bit switch table entry. This is generated for an expression |
| 232 | such as ``.word L1 - L2''. The offset holds the difference |
| 233 | between the reloc address and L2. */ |
| 234 | HOWTO (R_SH_SWITCH16, /* type */ |
| 235 | 0, /* rightshift */ |
| 236 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 237 | 16, /* bitsize */ |
| 238 | false, /* pc_relative */ |
| 239 | 0, /* bitpos */ |
| 240 | complain_overflow_unsigned, /* complain_on_overflow */ |
| 241 | sh_elf_ignore_reloc, /* special_function */ |
| 242 | "R_SH_SWITCH16", /* name */ |
| 243 | false, /* partial_inplace */ |
| 244 | 0, /* src_mask */ |
| 245 | 0, /* dst_mask */ |
| 246 | true), /* pcrel_offset */ |
| 247 | |
| 248 | /* A 32 bit switch table entry. This is generated for an expression |
| 249 | such as ``.long L1 - L2''. The offset holds the difference |
| 250 | between the reloc address and L2. */ |
| 251 | HOWTO (R_SH_SWITCH32, /* type */ |
| 252 | 0, /* rightshift */ |
| 253 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 254 | 32, /* bitsize */ |
| 255 | false, /* pc_relative */ |
| 256 | 0, /* bitpos */ |
| 257 | complain_overflow_unsigned, /* complain_on_overflow */ |
| 258 | sh_elf_ignore_reloc, /* special_function */ |
| 259 | "R_SH_SWITCH32", /* name */ |
| 260 | false, /* partial_inplace */ |
| 261 | 0, /* src_mask */ |
| 262 | 0, /* dst_mask */ |
| 263 | true), /* pcrel_offset */ |
| 264 | |
| 265 | /* Indicates a .uses pseudo-op. The compiler will generate .uses |
| 266 | pseudo-ops when it finds a function call which can be relaxed. |
| 267 | The offset field holds the PC relative offset to the instruction |
| 268 | which loads the register used in the function call. */ |
| 269 | HOWTO (R_SH_USES, /* type */ |
| 270 | 0, /* rightshift */ |
| 271 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 272 | 0, /* bitsize */ |
| 273 | false, /* pc_relative */ |
| 274 | 0, /* bitpos */ |
| 275 | complain_overflow_unsigned, /* complain_on_overflow */ |
| 276 | sh_elf_ignore_reloc, /* special_function */ |
| 277 | "R_SH_USES", /* name */ |
| 278 | false, /* partial_inplace */ |
| 279 | 0, /* src_mask */ |
| 280 | 0, /* dst_mask */ |
| 281 | true), /* pcrel_offset */ |
| 282 | |
| 283 | /* The assembler will generate this reloc for addresses referred to |
| 284 | by the register loads associated with USES relocs. The offset |
| 285 | field holds the number of times the address is referenced in the |
| 286 | object file. */ |
| 287 | HOWTO (R_SH_COUNT, /* type */ |
| 288 | 0, /* rightshift */ |
| 289 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 290 | 0, /* bitsize */ |
| 291 | false, /* pc_relative */ |
| 292 | 0, /* bitpos */ |
| 293 | complain_overflow_unsigned, /* complain_on_overflow */ |
| 294 | sh_elf_ignore_reloc, /* special_function */ |
| 295 | "R_SH_COUNT", /* name */ |
| 296 | false, /* partial_inplace */ |
| 297 | 0, /* src_mask */ |
| 298 | 0, /* dst_mask */ |
| 299 | true), /* pcrel_offset */ |
| 300 | |
| 301 | /* Indicates an alignment statement. The offset field is the power |
| 302 | of 2 to which subsequent portions of the object file must be |
| 303 | aligned. */ |
| 304 | HOWTO (R_SH_ALIGN, /* type */ |
| 305 | 0, /* rightshift */ |
| 306 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 307 | 0, /* bitsize */ |
| 308 | false, /* pc_relative */ |
| 309 | 0, /* bitpos */ |
| 310 | complain_overflow_unsigned, /* complain_on_overflow */ |
| 311 | sh_elf_ignore_reloc, /* special_function */ |
| 312 | "R_SH_ALIGN", /* name */ |
| 313 | false, /* partial_inplace */ |
| 314 | 0, /* src_mask */ |
| 315 | 0, /* dst_mask */ |
| 316 | true), /* pcrel_offset */ |
| 317 | |
| 318 | /* The assembler will generate this reloc before a block of |
| 319 | instructions. A section should be processed as assumining it |
| 320 | contains data, unless this reloc is seen. */ |
| 321 | HOWTO (R_SH_CODE, /* type */ |
| 322 | 0, /* rightshift */ |
| 323 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 324 | 0, /* bitsize */ |
| 325 | false, /* pc_relative */ |
| 326 | 0, /* bitpos */ |
| 327 | complain_overflow_unsigned, /* complain_on_overflow */ |
| 328 | sh_elf_ignore_reloc, /* special_function */ |
| 329 | "R_SH_CODE", /* name */ |
| 330 | false, /* partial_inplace */ |
| 331 | 0, /* src_mask */ |
| 332 | 0, /* dst_mask */ |
| 333 | true), /* pcrel_offset */ |
| 334 | |
| 335 | /* The assembler will generate this reloc after a block of |
| 336 | instructions when it sees data that is not instructions. */ |
| 337 | HOWTO (R_SH_DATA, /* type */ |
| 338 | 0, /* rightshift */ |
| 339 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 340 | 0, /* bitsize */ |
| 341 | false, /* pc_relative */ |
| 342 | 0, /* bitpos */ |
| 343 | complain_overflow_unsigned, /* complain_on_overflow */ |
| 344 | sh_elf_ignore_reloc, /* special_function */ |
| 345 | "R_SH_DATA", /* name */ |
| 346 | false, /* partial_inplace */ |
| 347 | 0, /* src_mask */ |
| 348 | 0, /* dst_mask */ |
| 349 | true), /* pcrel_offset */ |
| 350 | |
| 351 | /* The assembler generates this reloc for each label within a block |
| 352 | of instructions. This permits the linker to avoid swapping |
| 353 | instructions which are the targets of branches. */ |
| 354 | HOWTO (R_SH_LABEL, /* type */ |
| 355 | 0, /* rightshift */ |
| 356 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 357 | 0, /* bitsize */ |
| 358 | false, /* pc_relative */ |
| 359 | 0, /* bitpos */ |
| 360 | complain_overflow_unsigned, /* complain_on_overflow */ |
| 361 | sh_elf_ignore_reloc, /* special_function */ |
| 362 | "R_SH_LABEL", /* name */ |
| 363 | false, /* partial_inplace */ |
| 364 | 0, /* src_mask */ |
| 365 | 0, /* dst_mask */ |
| 366 | true), /* pcrel_offset */ |
| 367 | |
| 368 | /* An 8 bit switch table entry. This is generated for an expression |
| 369 | such as ``.word L1 - L2''. The offset holds the difference |
| 370 | between the reloc address and L2. */ |
| 371 | HOWTO (R_SH_SWITCH8, /* type */ |
| 372 | 0, /* rightshift */ |
| 373 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 374 | 8, /* bitsize */ |
| 375 | false, /* pc_relative */ |
| 376 | 0, /* bitpos */ |
| 377 | complain_overflow_unsigned, /* complain_on_overflow */ |
| 378 | sh_elf_ignore_reloc, /* special_function */ |
| 379 | "R_SH_SWITCH8", /* name */ |
| 380 | false, /* partial_inplace */ |
| 381 | 0, /* src_mask */ |
| 382 | 0, /* dst_mask */ |
| 383 | true), /* pcrel_offset */ |
| 384 | |
| 385 | /* GNU extension to record C++ vtable hierarchy */ |
| 386 | HOWTO (R_SH_GNU_VTINHERIT, /* type */ |
| 387 | 0, /* rightshift */ |
| 388 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 389 | 0, /* bitsize */ |
| 390 | false, /* pc_relative */ |
| 391 | 0, /* bitpos */ |
| 392 | complain_overflow_dont, /* complain_on_overflow */ |
| 393 | NULL, /* special_function */ |
| 394 | "R_SH_GNU_VTINHERIT", /* name */ |
| 395 | false, /* partial_inplace */ |
| 396 | 0, /* src_mask */ |
| 397 | 0, /* dst_mask */ |
| 398 | false), /* pcrel_offset */ |
| 399 | |
| 400 | /* GNU extension to record C++ vtable member usage */ |
| 401 | HOWTO (R_SH_GNU_VTENTRY, /* type */ |
| 402 | 0, /* rightshift */ |
| 403 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 404 | 0, /* bitsize */ |
| 405 | false, /* pc_relative */ |
| 406 | 0, /* bitpos */ |
| 407 | complain_overflow_dont, /* complain_on_overflow */ |
| 408 | _bfd_elf_rel_vtable_reloc_fn, /* special_function */ |
| 409 | "R_SH_GNU_VTENTRY", /* name */ |
| 410 | false, /* partial_inplace */ |
| 411 | 0, /* src_mask */ |
| 412 | 0, /* dst_mask */ |
| 413 | false), /* pcrel_offset */ |
| 414 | |
| 415 | }; |
| 416 | |
| 417 | /* This function is used for normal relocs. This is like the COFF |
| 418 | function, and is almost certainly incorrect for other ELF targets. */ |
| 419 | |
| 420 | static bfd_reloc_status_type |
| 421 | sh_elf_reloc (abfd, reloc_entry, symbol_in, data, input_section, output_bfd, |
| 422 | error_message) |
| 423 | bfd *abfd; |
| 424 | arelent *reloc_entry; |
| 425 | asymbol *symbol_in; |
| 426 | PTR data; |
| 427 | asection *input_section; |
| 428 | bfd *output_bfd; |
| 429 | char **error_message; |
| 430 | { |
| 431 | unsigned long insn; |
| 432 | bfd_vma sym_value; |
| 433 | enum elf_sh_reloc_type r_type; |
| 434 | bfd_vma addr = reloc_entry->address; |
| 435 | bfd_byte *hit_data = addr + (bfd_byte *) data; |
| 436 | |
| 437 | r_type = (enum elf_sh_reloc_type) reloc_entry->howto->type; |
| 438 | |
| 439 | if (output_bfd != NULL) |
| 440 | { |
| 441 | /* Partial linking--do nothing. */ |
| 442 | reloc_entry->address += input_section->output_offset; |
| 443 | return bfd_reloc_ok; |
| 444 | } |
| 445 | |
| 446 | /* Almost all relocs have to do with relaxing. If any work must be |
| 447 | done for them, it has been done in sh_relax_section. */ |
| 448 | if (r_type != R_SH_DIR32 |
| 449 | && (r_type != R_SH_IND12W |
| 450 | || (symbol_in->flags & BSF_LOCAL) != 0)) |
| 451 | return bfd_reloc_ok; |
| 452 | |
| 453 | if (symbol_in != NULL |
| 454 | && bfd_is_und_section (symbol_in->section)) |
| 455 | return bfd_reloc_undefined; |
| 456 | |
| 457 | if (bfd_is_com_section (symbol_in->section)) |
| 458 | sym_value = 0; |
| 459 | else |
| 460 | sym_value = (symbol_in->value + |
| 461 | symbol_in->section->output_section->vma + |
| 462 | symbol_in->section->output_offset); |
| 463 | |
| 464 | switch (r_type) |
| 465 | { |
| 466 | case R_SH_DIR32: |
| 467 | insn = bfd_get_32 (abfd, hit_data); |
| 468 | insn += sym_value + reloc_entry->addend; |
| 469 | bfd_put_32 (abfd, insn, hit_data); |
| 470 | break; |
| 471 | case R_SH_IND12W: |
| 472 | insn = bfd_get_16 (abfd, hit_data); |
| 473 | sym_value += reloc_entry->addend; |
| 474 | sym_value -= (input_section->output_section->vma |
| 475 | + input_section->output_offset |
| 476 | + addr |
| 477 | + 4); |
| 478 | sym_value += (insn & 0xfff) << 1; |
| 479 | if (insn & 0x800) |
| 480 | sym_value -= 0x1000; |
| 481 | insn = (insn & 0xf000) | (sym_value & 0xfff); |
| 482 | bfd_put_16 (abfd, insn, hit_data); |
| 483 | if (sym_value < (bfd_vma) -0x1000 || sym_value >= 0x1000) |
| 484 | return bfd_reloc_overflow; |
| 485 | break; |
| 486 | default: |
| 487 | abort (); |
| 488 | break; |
| 489 | } |
| 490 | |
| 491 | return bfd_reloc_ok; |
| 492 | } |
| 493 | |
| 494 | /* This function is used for relocs which are only used for relaxing, |
| 495 | which the linker should otherwise ignore. */ |
| 496 | |
| 497 | static bfd_reloc_status_type |
| 498 | sh_elf_ignore_reloc (abfd, reloc_entry, symbol, data, input_section, |
| 499 | output_bfd, error_message) |
| 500 | bfd *abfd; |
| 501 | arelent *reloc_entry; |
| 502 | asymbol *symbol; |
| 503 | PTR data; |
| 504 | asection *input_section; |
| 505 | bfd *output_bfd; |
| 506 | char **error_message; |
| 507 | { |
| 508 | if (output_bfd != NULL) |
| 509 | reloc_entry->address += input_section->output_offset; |
| 510 | return bfd_reloc_ok; |
| 511 | } |
| 512 | |
| 513 | /* This structure is used to map BFD reloc codes to SH ELF relocs. */ |
| 514 | |
| 515 | struct elf_reloc_map |
| 516 | { |
| 517 | bfd_reloc_code_real_type bfd_reloc_val; |
| 518 | unsigned char elf_reloc_val; |
| 519 | }; |
| 520 | |
| 521 | /* An array mapping BFD reloc codes to SH ELF relocs. */ |
| 522 | |
| 523 | static const struct elf_reloc_map sh_reloc_map[] = |
| 524 | { |
| 525 | { BFD_RELOC_NONE, R_SH_NONE }, |
| 526 | { BFD_RELOC_32, R_SH_DIR32 }, |
| 527 | { BFD_RELOC_CTOR, R_SH_DIR32 }, |
| 528 | { BFD_RELOC_32_PCREL, R_SH_REL32 }, |
| 529 | { BFD_RELOC_SH_PCDISP8BY2, R_SH_DIR8WPN }, |
| 530 | { BFD_RELOC_SH_PCDISP12BY2, R_SH_IND12W }, |
| 531 | { BFD_RELOC_SH_PCRELIMM8BY2, R_SH_DIR8WPZ }, |
| 532 | { BFD_RELOC_SH_PCRELIMM8BY4, R_SH_DIR8WPL }, |
| 533 | { BFD_RELOC_8_PCREL, R_SH_SWITCH8 }, |
| 534 | { BFD_RELOC_SH_SWITCH16, R_SH_SWITCH16 }, |
| 535 | { BFD_RELOC_SH_SWITCH32, R_SH_SWITCH32 }, |
| 536 | { BFD_RELOC_SH_USES, R_SH_USES }, |
| 537 | { BFD_RELOC_SH_COUNT, R_SH_COUNT }, |
| 538 | { BFD_RELOC_SH_ALIGN, R_SH_ALIGN }, |
| 539 | { BFD_RELOC_SH_CODE, R_SH_CODE }, |
| 540 | { BFD_RELOC_SH_DATA, R_SH_DATA }, |
| 541 | { BFD_RELOC_SH_LABEL, R_SH_LABEL }, |
| 542 | { BFD_RELOC_VTABLE_INHERIT, R_SH_GNU_VTINHERIT }, |
| 543 | { BFD_RELOC_VTABLE_ENTRY, R_SH_GNU_VTENTRY }, |
| 544 | }; |
| 545 | |
| 546 | /* Given a BFD reloc code, return the howto structure for the |
| 547 | corresponding SH ELf reloc. */ |
| 548 | |
| 549 | static reloc_howto_type * |
| 550 | sh_elf_reloc_type_lookup (abfd, code) |
| 551 | bfd *abfd; |
| 552 | bfd_reloc_code_real_type code; |
| 553 | { |
| 554 | unsigned int i; |
| 555 | |
| 556 | for (i = 0; i < sizeof (sh_reloc_map) / sizeof (struct elf_reloc_map); i++) |
| 557 | { |
| 558 | if (sh_reloc_map[i].bfd_reloc_val == code) |
| 559 | return &sh_elf_howto_table[(int) sh_reloc_map[i].elf_reloc_val]; |
| 560 | } |
| 561 | |
| 562 | return NULL; |
| 563 | } |
| 564 | |
| 565 | /* Given an ELF reloc, fill in the howto field of a relent. */ |
| 566 | |
| 567 | static void |
| 568 | sh_elf_info_to_howto (abfd, cache_ptr, dst) |
| 569 | bfd *abfd; |
| 570 | arelent *cache_ptr; |
| 571 | Elf_Internal_Rela *dst; |
| 572 | { |
| 573 | unsigned int r; |
| 574 | |
| 575 | r = ELF32_R_TYPE (dst->r_info); |
| 576 | |
| 577 | BFD_ASSERT (r < (unsigned int) R_SH_max); |
| 578 | BFD_ASSERT (r < R_SH_FIRST_INVALID_RELOC || r > R_SH_LAST_INVALID_RELOC); |
| 579 | |
| 580 | cache_ptr->howto = &sh_elf_howto_table[r]; |
| 581 | } |
| 582 | \f |
| 583 | /* This function handles relaxing for SH ELF. See the corresponding |
| 584 | function in coff-sh.c for a description of what this does. FIXME: |
| 585 | There is a lot of duplication here between this code and the COFF |
| 586 | specific code. The format of relocs and symbols is wound deeply |
| 587 | into this code, but it would still be better if the duplication |
| 588 | could be eliminated somehow. Note in particular that although both |
| 589 | functions use symbols like R_SH_CODE, those symbols have different |
| 590 | values; in coff-sh.c they come from include/coff/sh.h, whereas here |
| 591 | they come from enum elf_sh_reloc_type in include/elf/sh.h. */ |
| 592 | |
| 593 | static boolean |
| 594 | sh_elf_relax_section (abfd, sec, link_info, again) |
| 595 | bfd *abfd; |
| 596 | asection *sec; |
| 597 | struct bfd_link_info *link_info; |
| 598 | boolean *again; |
| 599 | { |
| 600 | Elf_Internal_Shdr *symtab_hdr; |
| 601 | Elf_Internal_Rela *internal_relocs; |
| 602 | Elf_Internal_Rela *free_relocs = NULL; |
| 603 | boolean have_code; |
| 604 | Elf_Internal_Rela *irel, *irelend; |
| 605 | bfd_byte *contents = NULL; |
| 606 | bfd_byte *free_contents = NULL; |
| 607 | Elf32_External_Sym *extsyms = NULL; |
| 608 | Elf32_External_Sym *free_extsyms = NULL; |
| 609 | |
| 610 | *again = false; |
| 611 | |
| 612 | if (link_info->relocateable |
| 613 | || (sec->flags & SEC_RELOC) == 0 |
| 614 | || sec->reloc_count == 0) |
| 615 | return true; |
| 616 | |
| 617 | /* If this is the first time we have been called for this section, |
| 618 | initialize the cooked size. */ |
| 619 | if (sec->_cooked_size == 0) |
| 620 | sec->_cooked_size = sec->_raw_size; |
| 621 | |
| 622 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 623 | |
| 624 | internal_relocs = (_bfd_elf32_link_read_relocs |
| 625 | (abfd, sec, (PTR) NULL, (Elf_Internal_Rela *) NULL, |
| 626 | link_info->keep_memory)); |
| 627 | if (internal_relocs == NULL) |
| 628 | goto error_return; |
| 629 | if (! link_info->keep_memory) |
| 630 | free_relocs = internal_relocs; |
| 631 | |
| 632 | have_code = false; |
| 633 | |
| 634 | irelend = internal_relocs + sec->reloc_count; |
| 635 | for (irel = internal_relocs; irel < irelend; irel++) |
| 636 | { |
| 637 | bfd_vma laddr, paddr, symval; |
| 638 | unsigned short insn; |
| 639 | Elf_Internal_Rela *irelfn, *irelscan, *irelcount; |
| 640 | bfd_signed_vma foff; |
| 641 | |
| 642 | if (ELF32_R_TYPE (irel->r_info) == (int) R_SH_CODE) |
| 643 | have_code = true; |
| 644 | |
| 645 | if (ELF32_R_TYPE (irel->r_info) != (int) R_SH_USES) |
| 646 | continue; |
| 647 | |
| 648 | /* Get the section contents. */ |
| 649 | if (contents == NULL) |
| 650 | { |
| 651 | if (elf_section_data (sec)->this_hdr.contents != NULL) |
| 652 | contents = elf_section_data (sec)->this_hdr.contents; |
| 653 | else |
| 654 | { |
| 655 | contents = (bfd_byte *) bfd_malloc (sec->_raw_size); |
| 656 | if (contents == NULL) |
| 657 | goto error_return; |
| 658 | free_contents = contents; |
| 659 | |
| 660 | if (! bfd_get_section_contents (abfd, sec, contents, |
| 661 | (file_ptr) 0, sec->_raw_size)) |
| 662 | goto error_return; |
| 663 | } |
| 664 | } |
| 665 | |
| 666 | /* The r_addend field of the R_SH_USES reloc will point us to |
| 667 | the register load. The 4 is because the r_addend field is |
| 668 | computed as though it were a jump offset, which are based |
| 669 | from 4 bytes after the jump instruction. */ |
| 670 | laddr = irel->r_offset + 4 + irel->r_addend; |
| 671 | if (laddr >= sec->_raw_size) |
| 672 | { |
| 673 | (*_bfd_error_handler) (_("%s: 0x%lx: warning: bad R_SH_USES offset"), |
| 674 | bfd_get_filename (abfd), |
| 675 | (unsigned long) irel->r_offset); |
| 676 | continue; |
| 677 | } |
| 678 | insn = bfd_get_16 (abfd, contents + laddr); |
| 679 | |
| 680 | /* If the instruction is not mov.l NN,rN, we don't know what to |
| 681 | do. */ |
| 682 | if ((insn & 0xf000) != 0xd000) |
| 683 | { |
| 684 | ((*_bfd_error_handler) |
| 685 | (_("%s: 0x%lx: warning: R_SH_USES points to unrecognized insn 0x%x"), |
| 686 | bfd_get_filename (abfd), (unsigned long) irel->r_offset, insn)); |
| 687 | continue; |
| 688 | } |
| 689 | |
| 690 | /* Get the address from which the register is being loaded. The |
| 691 | displacement in the mov.l instruction is quadrupled. It is a |
| 692 | displacement from four bytes after the movl instruction, but, |
| 693 | before adding in the PC address, two least significant bits |
| 694 | of the PC are cleared. We assume that the section is aligned |
| 695 | on a four byte boundary. */ |
| 696 | paddr = insn & 0xff; |
| 697 | paddr *= 4; |
| 698 | paddr += (laddr + 4) &~ 3; |
| 699 | if (paddr >= sec->_raw_size) |
| 700 | { |
| 701 | ((*_bfd_error_handler) |
| 702 | (_("%s: 0x%lx: warning: bad R_SH_USES load offset"), |
| 703 | bfd_get_filename (abfd), (unsigned long) irel->r_offset)); |
| 704 | continue; |
| 705 | } |
| 706 | |
| 707 | /* Get the reloc for the address from which the register is |
| 708 | being loaded. This reloc will tell us which function is |
| 709 | actually being called. */ |
| 710 | for (irelfn = internal_relocs; irelfn < irelend; irelfn++) |
| 711 | if (irelfn->r_offset == paddr |
| 712 | && ELF32_R_TYPE (irelfn->r_info) == (int) R_SH_DIR32) |
| 713 | break; |
| 714 | if (irelfn >= irelend) |
| 715 | { |
| 716 | ((*_bfd_error_handler) |
| 717 | (_("%s: 0x%lx: warning: could not find expected reloc"), |
| 718 | bfd_get_filename (abfd), (unsigned long) paddr)); |
| 719 | continue; |
| 720 | } |
| 721 | |
| 722 | /* Read this BFD's symbols if we haven't done so already. */ |
| 723 | if (extsyms == NULL) |
| 724 | { |
| 725 | if (symtab_hdr->contents != NULL) |
| 726 | extsyms = (Elf32_External_Sym *) symtab_hdr->contents; |
| 727 | else |
| 728 | { |
| 729 | extsyms = ((Elf32_External_Sym *) |
| 730 | bfd_malloc (symtab_hdr->sh_size)); |
| 731 | if (extsyms == NULL) |
| 732 | goto error_return; |
| 733 | free_extsyms = extsyms; |
| 734 | if (bfd_seek (abfd, symtab_hdr->sh_offset, SEEK_SET) != 0 |
| 735 | || (bfd_read (extsyms, 1, symtab_hdr->sh_size, abfd) |
| 736 | != symtab_hdr->sh_size)) |
| 737 | goto error_return; |
| 738 | } |
| 739 | } |
| 740 | |
| 741 | /* Get the value of the symbol referred to by the reloc. */ |
| 742 | if (ELF32_R_SYM (irelfn->r_info) < symtab_hdr->sh_info) |
| 743 | { |
| 744 | Elf_Internal_Sym isym; |
| 745 | |
| 746 | /* A local symbol. */ |
| 747 | bfd_elf32_swap_symbol_in (abfd, |
| 748 | extsyms + ELF32_R_SYM (irelfn->r_info), |
| 749 | &isym); |
| 750 | |
| 751 | if (isym.st_shndx != _bfd_elf_section_from_bfd_section (abfd, sec)) |
| 752 | { |
| 753 | ((*_bfd_error_handler) |
| 754 | (_("%s: 0x%lx: warning: symbol in unexpected section"), |
| 755 | bfd_get_filename (abfd), (unsigned long) paddr)); |
| 756 | continue; |
| 757 | } |
| 758 | |
| 759 | symval = (isym.st_value |
| 760 | + sec->output_section->vma |
| 761 | + sec->output_offset); |
| 762 | } |
| 763 | else |
| 764 | { |
| 765 | unsigned long indx; |
| 766 | struct elf_link_hash_entry *h; |
| 767 | |
| 768 | indx = ELF32_R_SYM (irelfn->r_info) - symtab_hdr->sh_info; |
| 769 | h = elf_sym_hashes (abfd)[indx]; |
| 770 | BFD_ASSERT (h != NULL); |
| 771 | if (h->root.type != bfd_link_hash_defined |
| 772 | && h->root.type != bfd_link_hash_defweak) |
| 773 | { |
| 774 | /* This appears to be a reference to an undefined |
| 775 | symbol. Just ignore it--it will be caught by the |
| 776 | regular reloc processing. */ |
| 777 | continue; |
| 778 | } |
| 779 | |
| 780 | symval = (h->root.u.def.value |
| 781 | + h->root.u.def.section->output_section->vma |
| 782 | + h->root.u.def.section->output_offset); |
| 783 | } |
| 784 | |
| 785 | symval += bfd_get_32 (abfd, contents + paddr); |
| 786 | |
| 787 | /* See if this function call can be shortened. */ |
| 788 | foff = (symval |
| 789 | - (irel->r_offset |
| 790 | + sec->output_section->vma |
| 791 | + sec->output_offset |
| 792 | + 4)); |
| 793 | if (foff < -0x1000 || foff >= 0x1000) |
| 794 | { |
| 795 | /* After all that work, we can't shorten this function call. */ |
| 796 | continue; |
| 797 | } |
| 798 | |
| 799 | /* Shorten the function call. */ |
| 800 | |
| 801 | /* For simplicity of coding, we are going to modify the section |
| 802 | contents, the section relocs, and the BFD symbol table. We |
| 803 | must tell the rest of the code not to free up this |
| 804 | information. It would be possible to instead create a table |
| 805 | of changes which have to be made, as is done in coff-mips.c; |
| 806 | that would be more work, but would require less memory when |
| 807 | the linker is run. */ |
| 808 | |
| 809 | elf_section_data (sec)->relocs = internal_relocs; |
| 810 | free_relocs = NULL; |
| 811 | |
| 812 | elf_section_data (sec)->this_hdr.contents = contents; |
| 813 | free_contents = NULL; |
| 814 | |
| 815 | symtab_hdr->contents = (bfd_byte *) extsyms; |
| 816 | free_extsyms = NULL; |
| 817 | |
| 818 | /* Replace the jsr with a bsr. */ |
| 819 | |
| 820 | /* Change the R_SH_USES reloc into an R_SH_IND12W reloc, and |
| 821 | replace the jsr with a bsr. */ |
| 822 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irelfn->r_info), R_SH_IND12W); |
| 823 | if (ELF32_R_SYM (irelfn->r_info) < symtab_hdr->sh_info) |
| 824 | { |
| 825 | /* If this needs to be changed because of future relaxing, |
| 826 | it will be handled here like other internal IND12W |
| 827 | relocs. */ |
| 828 | bfd_put_16 (abfd, |
| 829 | 0xb000 | ((foff >> 1) & 0xfff), |
| 830 | contents + irel->r_offset); |
| 831 | } |
| 832 | else |
| 833 | { |
| 834 | /* We can't fully resolve this yet, because the external |
| 835 | symbol value may be changed by future relaxing. We let |
| 836 | the final link phase handle it. */ |
| 837 | bfd_put_16 (abfd, 0xb000, contents + irel->r_offset); |
| 838 | } |
| 839 | |
| 840 | /* See if there is another R_SH_USES reloc referring to the same |
| 841 | register load. */ |
| 842 | for (irelscan = internal_relocs; irelscan < irelend; irelscan++) |
| 843 | if (ELF32_R_TYPE (irelscan->r_info) == (int) R_SH_USES |
| 844 | && laddr == irelscan->r_offset + 4 + irelscan->r_addend) |
| 845 | break; |
| 846 | if (irelscan < irelend) |
| 847 | { |
| 848 | /* Some other function call depends upon this register load, |
| 849 | and we have not yet converted that function call. |
| 850 | Indeed, we may never be able to convert it. There is |
| 851 | nothing else we can do at this point. */ |
| 852 | continue; |
| 853 | } |
| 854 | |
| 855 | /* Look for a R_SH_COUNT reloc on the location where the |
| 856 | function address is stored. Do this before deleting any |
| 857 | bytes, to avoid confusion about the address. */ |
| 858 | for (irelcount = internal_relocs; irelcount < irelend; irelcount++) |
| 859 | if (irelcount->r_offset == paddr |
| 860 | && ELF32_R_TYPE (irelcount->r_info) == (int) R_SH_COUNT) |
| 861 | break; |
| 862 | |
| 863 | /* Delete the register load. */ |
| 864 | if (! sh_elf_relax_delete_bytes (abfd, sec, laddr, 2)) |
| 865 | goto error_return; |
| 866 | |
| 867 | /* That will change things, so, just in case it permits some |
| 868 | other function call to come within range, we should relax |
| 869 | again. Note that this is not required, and it may be slow. */ |
| 870 | *again = true; |
| 871 | |
| 872 | /* Now check whether we got a COUNT reloc. */ |
| 873 | if (irelcount >= irelend) |
| 874 | { |
| 875 | ((*_bfd_error_handler) |
| 876 | (_("%s: 0x%lx: warning: could not find expected COUNT reloc"), |
| 877 | bfd_get_filename (abfd), (unsigned long) paddr)); |
| 878 | continue; |
| 879 | } |
| 880 | |
| 881 | /* The number of uses is stored in the r_addend field. We've |
| 882 | just deleted one. */ |
| 883 | if (irelcount->r_addend == 0) |
| 884 | { |
| 885 | ((*_bfd_error_handler) (_("%s: 0x%lx: warning: bad count"), |
| 886 | bfd_get_filename (abfd), |
| 887 | (unsigned long) paddr)); |
| 888 | continue; |
| 889 | } |
| 890 | |
| 891 | --irelcount->r_addend; |
| 892 | |
| 893 | /* If there are no more uses, we can delete the address. Reload |
| 894 | the address from irelfn, in case it was changed by the |
| 895 | previous call to sh_elf_relax_delete_bytes. */ |
| 896 | if (irelcount->r_addend == 0) |
| 897 | { |
| 898 | if (! sh_elf_relax_delete_bytes (abfd, sec, irelfn->r_offset, 4)) |
| 899 | goto error_return; |
| 900 | } |
| 901 | |
| 902 | /* We've done all we can with that function call. */ |
| 903 | } |
| 904 | |
| 905 | /* Look for load and store instructions that we can align on four |
| 906 | byte boundaries. */ |
| 907 | if (have_code) |
| 908 | { |
| 909 | boolean swapped; |
| 910 | |
| 911 | /* Get the section contents. */ |
| 912 | if (contents == NULL) |
| 913 | { |
| 914 | if (elf_section_data (sec)->this_hdr.contents != NULL) |
| 915 | contents = elf_section_data (sec)->this_hdr.contents; |
| 916 | else |
| 917 | { |
| 918 | contents = (bfd_byte *) bfd_malloc (sec->_raw_size); |
| 919 | if (contents == NULL) |
| 920 | goto error_return; |
| 921 | free_contents = contents; |
| 922 | |
| 923 | if (! bfd_get_section_contents (abfd, sec, contents, |
| 924 | (file_ptr) 0, sec->_raw_size)) |
| 925 | goto error_return; |
| 926 | } |
| 927 | } |
| 928 | |
| 929 | if (! sh_elf_align_loads (abfd, sec, internal_relocs, contents, |
| 930 | &swapped)) |
| 931 | goto error_return; |
| 932 | |
| 933 | if (swapped) |
| 934 | { |
| 935 | elf_section_data (sec)->relocs = internal_relocs; |
| 936 | free_relocs = NULL; |
| 937 | |
| 938 | elf_section_data (sec)->this_hdr.contents = contents; |
| 939 | free_contents = NULL; |
| 940 | |
| 941 | symtab_hdr->contents = (bfd_byte *) extsyms; |
| 942 | free_extsyms = NULL; |
| 943 | } |
| 944 | } |
| 945 | |
| 946 | if (free_relocs != NULL) |
| 947 | { |
| 948 | free (free_relocs); |
| 949 | free_relocs = NULL; |
| 950 | } |
| 951 | |
| 952 | if (free_contents != NULL) |
| 953 | { |
| 954 | if (! link_info->keep_memory) |
| 955 | free (free_contents); |
| 956 | else |
| 957 | { |
| 958 | /* Cache the section contents for elf_link_input_bfd. */ |
| 959 | elf_section_data (sec)->this_hdr.contents = contents; |
| 960 | } |
| 961 | free_contents = NULL; |
| 962 | } |
| 963 | |
| 964 | if (free_extsyms != NULL) |
| 965 | { |
| 966 | if (! link_info->keep_memory) |
| 967 | free (free_extsyms); |
| 968 | else |
| 969 | { |
| 970 | /* Cache the symbols for elf_link_input_bfd. */ |
| 971 | symtab_hdr->contents = extsyms; |
| 972 | } |
| 973 | free_extsyms = NULL; |
| 974 | } |
| 975 | |
| 976 | return true; |
| 977 | |
| 978 | error_return: |
| 979 | if (free_relocs != NULL) |
| 980 | free (free_relocs); |
| 981 | if (free_contents != NULL) |
| 982 | free (free_contents); |
| 983 | if (free_extsyms != NULL) |
| 984 | free (free_extsyms); |
| 985 | return false; |
| 986 | } |
| 987 | |
| 988 | /* Delete some bytes from a section while relaxing. FIXME: There is a |
| 989 | lot of duplication between this function and sh_relax_delete_bytes |
| 990 | in coff-sh.c. */ |
| 991 | |
| 992 | static boolean |
| 993 | sh_elf_relax_delete_bytes (abfd, sec, addr, count) |
| 994 | bfd *abfd; |
| 995 | asection *sec; |
| 996 | bfd_vma addr; |
| 997 | int count; |
| 998 | { |
| 999 | Elf_Internal_Shdr *symtab_hdr; |
| 1000 | Elf32_External_Sym *extsyms; |
| 1001 | int shndx, index; |
| 1002 | bfd_byte *contents; |
| 1003 | Elf_Internal_Rela *irel, *irelend; |
| 1004 | Elf_Internal_Rela *irelalign; |
| 1005 | bfd_vma toaddr; |
| 1006 | Elf32_External_Sym *esym, *esymend; |
| 1007 | struct elf_link_hash_entry *sym_hash; |
| 1008 | asection *o; |
| 1009 | |
| 1010 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 1011 | extsyms = (Elf32_External_Sym *) symtab_hdr->contents; |
| 1012 | |
| 1013 | shndx = _bfd_elf_section_from_bfd_section (abfd, sec); |
| 1014 | |
| 1015 | contents = elf_section_data (sec)->this_hdr.contents; |
| 1016 | |
| 1017 | /* The deletion must stop at the next ALIGN reloc for an aligment |
| 1018 | power larger than the number of bytes we are deleting. */ |
| 1019 | |
| 1020 | irelalign = NULL; |
| 1021 | toaddr = sec->_cooked_size; |
| 1022 | |
| 1023 | irel = elf_section_data (sec)->relocs; |
| 1024 | irelend = irel + sec->reloc_count; |
| 1025 | for (; irel < irelend; irel++) |
| 1026 | { |
| 1027 | if (ELF32_R_TYPE (irel->r_info) == (int) R_SH_ALIGN |
| 1028 | && irel->r_offset > addr |
| 1029 | && count < (1 << irel->r_addend)) |
| 1030 | { |
| 1031 | irelalign = irel; |
| 1032 | toaddr = irel->r_offset; |
| 1033 | break; |
| 1034 | } |
| 1035 | } |
| 1036 | |
| 1037 | /* Actually delete the bytes. */ |
| 1038 | memmove (contents + addr, contents + addr + count, toaddr - addr - count); |
| 1039 | if (irelalign == NULL) |
| 1040 | sec->_cooked_size -= count; |
| 1041 | else |
| 1042 | { |
| 1043 | int i; |
| 1044 | |
| 1045 | #define NOP_OPCODE (0x0009) |
| 1046 | |
| 1047 | BFD_ASSERT ((count & 1) == 0); |
| 1048 | for (i = 0; i < count; i += 2) |
| 1049 | bfd_put_16 (abfd, NOP_OPCODE, contents + toaddr - count + i); |
| 1050 | } |
| 1051 | |
| 1052 | /* Adjust all the relocs. */ |
| 1053 | for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++) |
| 1054 | { |
| 1055 | bfd_vma nraddr, stop; |
| 1056 | bfd_vma start = 0; |
| 1057 | int insn = 0; |
| 1058 | Elf_Internal_Sym sym; |
| 1059 | int off, adjust, oinsn; |
| 1060 | bfd_signed_vma voff = 0; |
| 1061 | boolean overflow; |
| 1062 | |
| 1063 | /* Get the new reloc address. */ |
| 1064 | nraddr = irel->r_offset; |
| 1065 | if ((irel->r_offset > addr |
| 1066 | && irel->r_offset < toaddr) |
| 1067 | || (ELF32_R_TYPE (irel->r_info) == (int) R_SH_ALIGN |
| 1068 | && irel->r_offset == toaddr)) |
| 1069 | nraddr -= count; |
| 1070 | |
| 1071 | /* See if this reloc was for the bytes we have deleted, in which |
| 1072 | case we no longer care about it. Don't delete relocs which |
| 1073 | represent addresses, though. */ |
| 1074 | if (irel->r_offset >= addr |
| 1075 | && irel->r_offset < addr + count |
| 1076 | && ELF32_R_TYPE (irel->r_info) != (int) R_SH_ALIGN |
| 1077 | && ELF32_R_TYPE (irel->r_info) != (int) R_SH_CODE |
| 1078 | && ELF32_R_TYPE (irel->r_info) != (int) R_SH_DATA |
| 1079 | && ELF32_R_TYPE (irel->r_info) != (int) R_SH_LABEL) |
| 1080 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| 1081 | (int) R_SH_NONE); |
| 1082 | |
| 1083 | /* If this is a PC relative reloc, see if the range it covers |
| 1084 | includes the bytes we have deleted. */ |
| 1085 | switch ((enum elf_sh_reloc_type) ELF32_R_TYPE (irel->r_info)) |
| 1086 | { |
| 1087 | default: |
| 1088 | break; |
| 1089 | |
| 1090 | case R_SH_DIR8WPN: |
| 1091 | case R_SH_IND12W: |
| 1092 | case R_SH_DIR8WPZ: |
| 1093 | case R_SH_DIR8WPL: |
| 1094 | start = irel->r_offset; |
| 1095 | insn = bfd_get_16 (abfd, contents + nraddr); |
| 1096 | break; |
| 1097 | } |
| 1098 | |
| 1099 | switch ((enum elf_sh_reloc_type) ELF32_R_TYPE (irel->r_info)) |
| 1100 | { |
| 1101 | default: |
| 1102 | start = stop = addr; |
| 1103 | break; |
| 1104 | |
| 1105 | case R_SH_DIR32: |
| 1106 | /* If this reloc is against a symbol defined in this |
| 1107 | section, and the symbol will not be adjusted below, we |
| 1108 | must check the addend to see it will put the value in |
| 1109 | range to be adjusted, and hence must be changed. */ |
| 1110 | if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) |
| 1111 | { |
| 1112 | bfd_elf32_swap_symbol_in (abfd, |
| 1113 | extsyms + ELF32_R_SYM (irel->r_info), |
| 1114 | &sym); |
| 1115 | if (sym.st_shndx == shndx |
| 1116 | && (sym.st_value <= addr |
| 1117 | || sym.st_value >= toaddr)) |
| 1118 | { |
| 1119 | bfd_vma val; |
| 1120 | |
| 1121 | val = bfd_get_32 (abfd, contents + nraddr); |
| 1122 | val += sym.st_value; |
| 1123 | if (val > addr && val < toaddr) |
| 1124 | bfd_put_32 (abfd, val - count, contents + nraddr); |
| 1125 | } |
| 1126 | } |
| 1127 | start = stop = addr; |
| 1128 | break; |
| 1129 | |
| 1130 | case R_SH_DIR8WPN: |
| 1131 | off = insn & 0xff; |
| 1132 | if (off & 0x80) |
| 1133 | off -= 0x100; |
| 1134 | stop = (bfd_vma) ((bfd_signed_vma) start + 4 + off * 2); |
| 1135 | break; |
| 1136 | |
| 1137 | case R_SH_IND12W: |
| 1138 | if (ELF32_R_SYM (irel->r_info) >= symtab_hdr->sh_info) |
| 1139 | start = stop = addr; |
| 1140 | else |
| 1141 | { |
| 1142 | off = insn & 0xfff; |
| 1143 | if (off & 0x800) |
| 1144 | off -= 0x1000; |
| 1145 | stop = (bfd_vma) ((bfd_signed_vma) start + 4 + off * 2); |
| 1146 | } |
| 1147 | break; |
| 1148 | |
| 1149 | case R_SH_DIR8WPZ: |
| 1150 | off = insn & 0xff; |
| 1151 | stop = start + 4 + off * 2; |
| 1152 | break; |
| 1153 | |
| 1154 | case R_SH_DIR8WPL: |
| 1155 | off = insn & 0xff; |
| 1156 | stop = (start &~ (bfd_vma) 3) + 4 + off * 4; |
| 1157 | break; |
| 1158 | |
| 1159 | case R_SH_SWITCH8: |
| 1160 | case R_SH_SWITCH16: |
| 1161 | case R_SH_SWITCH32: |
| 1162 | /* These relocs types represent |
| 1163 | .word L2-L1 |
| 1164 | The r_offset field holds the difference between the reloc |
| 1165 | address and L1. That is the start of the reloc, and |
| 1166 | adding in the contents gives us the top. We must adjust |
| 1167 | both the r_offset field and the section contents. */ |
| 1168 | |
| 1169 | start = irel->r_offset; |
| 1170 | stop = (bfd_vma) ((bfd_signed_vma) start - (long) irel->r_addend); |
| 1171 | |
| 1172 | if (start > addr |
| 1173 | && start < toaddr |
| 1174 | && (stop <= addr || stop >= toaddr)) |
| 1175 | irel->r_addend += count; |
| 1176 | else if (stop > addr |
| 1177 | && stop < toaddr |
| 1178 | && (start <= addr || start >= toaddr)) |
| 1179 | irel->r_addend -= count; |
| 1180 | |
| 1181 | start = stop; |
| 1182 | |
| 1183 | if (ELF32_R_TYPE (irel->r_info) == (int) R_SH_SWITCH16) |
| 1184 | voff = bfd_get_signed_16 (abfd, contents + nraddr); |
| 1185 | else if (ELF32_R_TYPE (irel->r_info) == (int) R_SH_SWITCH8) |
| 1186 | voff = bfd_get_8 (abfd, contents + nraddr); |
| 1187 | else |
| 1188 | voff = bfd_get_signed_32 (abfd, contents + nraddr); |
| 1189 | stop = (bfd_vma) ((bfd_signed_vma) start + voff); |
| 1190 | |
| 1191 | break; |
| 1192 | |
| 1193 | case R_SH_USES: |
| 1194 | start = irel->r_offset; |
| 1195 | stop = (bfd_vma) ((bfd_signed_vma) start |
| 1196 | + (long) irel->r_addend |
| 1197 | + 4); |
| 1198 | break; |
| 1199 | } |
| 1200 | |
| 1201 | if (start > addr |
| 1202 | && start < toaddr |
| 1203 | && (stop <= addr || stop >= toaddr)) |
| 1204 | adjust = count; |
| 1205 | else if (stop > addr |
| 1206 | && stop < toaddr |
| 1207 | && (start <= addr || start >= toaddr)) |
| 1208 | adjust = - count; |
| 1209 | else |
| 1210 | adjust = 0; |
| 1211 | |
| 1212 | if (adjust != 0) |
| 1213 | { |
| 1214 | oinsn = insn; |
| 1215 | overflow = false; |
| 1216 | switch ((enum elf_sh_reloc_type) ELF32_R_TYPE (irel->r_info)) |
| 1217 | { |
| 1218 | default: |
| 1219 | abort (); |
| 1220 | break; |
| 1221 | |
| 1222 | case R_SH_DIR8WPN: |
| 1223 | case R_SH_DIR8WPZ: |
| 1224 | insn += adjust / 2; |
| 1225 | if ((oinsn & 0xff00) != (insn & 0xff00)) |
| 1226 | overflow = true; |
| 1227 | bfd_put_16 (abfd, insn, contents + nraddr); |
| 1228 | break; |
| 1229 | |
| 1230 | case R_SH_IND12W: |
| 1231 | insn += adjust / 2; |
| 1232 | if ((oinsn & 0xf000) != (insn & 0xf000)) |
| 1233 | overflow = true; |
| 1234 | bfd_put_16 (abfd, insn, contents + nraddr); |
| 1235 | break; |
| 1236 | |
| 1237 | case R_SH_DIR8WPL: |
| 1238 | BFD_ASSERT (adjust == count || count >= 4); |
| 1239 | if (count >= 4) |
| 1240 | insn += adjust / 4; |
| 1241 | else |
| 1242 | { |
| 1243 | if ((irel->r_offset & 3) == 0) |
| 1244 | ++insn; |
| 1245 | } |
| 1246 | if ((oinsn & 0xff00) != (insn & 0xff00)) |
| 1247 | overflow = true; |
| 1248 | bfd_put_16 (abfd, insn, contents + nraddr); |
| 1249 | break; |
| 1250 | |
| 1251 | case R_SH_SWITCH16: |
| 1252 | voff += adjust; |
| 1253 | if (voff < - 0x8000 || voff >= 0x8000) |
| 1254 | overflow = true; |
| 1255 | bfd_put_signed_16 (abfd, voff, contents + nraddr); |
| 1256 | break; |
| 1257 | |
| 1258 | case R_SH_SWITCH32: |
| 1259 | voff += adjust; |
| 1260 | bfd_put_signed_32 (abfd, voff, contents + nraddr); |
| 1261 | break; |
| 1262 | |
| 1263 | case R_SH_USES: |
| 1264 | irel->r_addend += adjust; |
| 1265 | break; |
| 1266 | } |
| 1267 | |
| 1268 | if (overflow) |
| 1269 | { |
| 1270 | ((*_bfd_error_handler) |
| 1271 | (_("%s: 0x%lx: fatal: reloc overflow while relaxing"), |
| 1272 | bfd_get_filename (abfd), (unsigned long) irel->r_offset)); |
| 1273 | bfd_set_error (bfd_error_bad_value); |
| 1274 | return false; |
| 1275 | } |
| 1276 | } |
| 1277 | |
| 1278 | irel->r_offset = nraddr; |
| 1279 | } |
| 1280 | |
| 1281 | /* Look through all the other sections. If there contain any IMM32 |
| 1282 | relocs against internal symbols which we are not going to adjust |
| 1283 | below, we may need to adjust the addends. */ |
| 1284 | for (o = abfd->sections; o != NULL; o = o->next) |
| 1285 | { |
| 1286 | Elf_Internal_Rela *internal_relocs; |
| 1287 | Elf_Internal_Rela *irelscan, *irelscanend; |
| 1288 | bfd_byte *ocontents; |
| 1289 | |
| 1290 | if (o == sec |
| 1291 | || (o->flags & SEC_RELOC) == 0 |
| 1292 | || o->reloc_count == 0) |
| 1293 | continue; |
| 1294 | |
| 1295 | /* We always cache the relocs. Perhaps, if info->keep_memory is |
| 1296 | false, we should free them, if we are permitted to, when we |
| 1297 | leave sh_coff_relax_section. */ |
| 1298 | internal_relocs = (_bfd_elf32_link_read_relocs |
| 1299 | (abfd, o, (PTR) NULL, (Elf_Internal_Rela *) NULL, |
| 1300 | true)); |
| 1301 | if (internal_relocs == NULL) |
| 1302 | return false; |
| 1303 | |
| 1304 | ocontents = NULL; |
| 1305 | irelscanend = internal_relocs + o->reloc_count; |
| 1306 | for (irelscan = internal_relocs; irelscan < irelscanend; irelscan++) |
| 1307 | { |
| 1308 | Elf_Internal_Sym sym; |
| 1309 | |
| 1310 | if (ELF32_R_TYPE (irelscan->r_info) != (int) R_SH_DIR32) |
| 1311 | continue; |
| 1312 | |
| 1313 | if (ELF32_R_SYM (irelscan->r_info) >= symtab_hdr->sh_info) |
| 1314 | continue; |
| 1315 | |
| 1316 | bfd_elf32_swap_symbol_in (abfd, |
| 1317 | extsyms + ELF32_R_SYM (irelscan->r_info), |
| 1318 | &sym); |
| 1319 | |
| 1320 | if (sym.st_shndx == shndx |
| 1321 | && (sym.st_value <= addr |
| 1322 | || sym.st_value >= toaddr)) |
| 1323 | { |
| 1324 | bfd_vma val; |
| 1325 | |
| 1326 | if (ocontents == NULL) |
| 1327 | { |
| 1328 | if (elf_section_data (o)->this_hdr.contents != NULL) |
| 1329 | ocontents = elf_section_data (o)->this_hdr.contents; |
| 1330 | else |
| 1331 | { |
| 1332 | /* We always cache the section contents. |
| 1333 | Perhaps, if info->keep_memory is false, we |
| 1334 | should free them, if we are permitted to, |
| 1335 | when we leave sh_coff_relax_section. */ |
| 1336 | ocontents = (bfd_byte *) bfd_malloc (o->_raw_size); |
| 1337 | if (ocontents == NULL) |
| 1338 | return false; |
| 1339 | if (! bfd_get_section_contents (abfd, o, ocontents, |
| 1340 | (file_ptr) 0, |
| 1341 | o->_raw_size)) |
| 1342 | return false; |
| 1343 | elf_section_data (o)->this_hdr.contents = ocontents; |
| 1344 | } |
| 1345 | } |
| 1346 | |
| 1347 | val = bfd_get_32 (abfd, ocontents + irelscan->r_offset); |
| 1348 | val += sym.st_value; |
| 1349 | if (val > addr && val < toaddr) |
| 1350 | bfd_put_32 (abfd, val - count, |
| 1351 | ocontents + irelscan->r_offset); |
| 1352 | } |
| 1353 | } |
| 1354 | } |
| 1355 | |
| 1356 | /* Adjust the local symbols defined in this section. */ |
| 1357 | esym = extsyms; |
| 1358 | esymend = esym + symtab_hdr->sh_info; |
| 1359 | for (; esym < esymend; esym++) |
| 1360 | { |
| 1361 | Elf_Internal_Sym isym; |
| 1362 | |
| 1363 | bfd_elf32_swap_symbol_in (abfd, esym, &isym); |
| 1364 | |
| 1365 | if (isym.st_shndx == shndx |
| 1366 | && isym.st_value > addr |
| 1367 | && isym.st_value < toaddr) |
| 1368 | { |
| 1369 | isym.st_value -= count; |
| 1370 | bfd_elf32_swap_symbol_out (abfd, &isym, esym); |
| 1371 | } |
| 1372 | } |
| 1373 | |
| 1374 | /* Now adjust the global symbols defined in this section. */ |
| 1375 | esym = extsyms + symtab_hdr->sh_info; |
| 1376 | esymend = extsyms + (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)); |
| 1377 | for (index = 0; esym < esymend; esym++, index++) |
| 1378 | { |
| 1379 | Elf_Internal_Sym isym; |
| 1380 | |
| 1381 | bfd_elf32_swap_symbol_in (abfd, esym, &isym); |
| 1382 | sym_hash = elf_sym_hashes (abfd)[index]; |
| 1383 | if (isym.st_shndx == shndx |
| 1384 | && ((sym_hash)->root.type == bfd_link_hash_defined |
| 1385 | || (sym_hash)->root.type == bfd_link_hash_defweak) |
| 1386 | && (sym_hash)->root.u.def.section == sec |
| 1387 | && (sym_hash)->root.u.def.value > addr |
| 1388 | && (sym_hash)->root.u.def.value < toaddr) |
| 1389 | { |
| 1390 | (sym_hash)->root.u.def.value -= count; |
| 1391 | } |
| 1392 | } |
| 1393 | |
| 1394 | /* See if we can move the ALIGN reloc forward. We have adjusted |
| 1395 | r_offset for it already. */ |
| 1396 | if (irelalign != NULL) |
| 1397 | { |
| 1398 | bfd_vma alignto, alignaddr; |
| 1399 | |
| 1400 | alignto = BFD_ALIGN (toaddr, 1 << irelalign->r_addend); |
| 1401 | alignaddr = BFD_ALIGN (irelalign->r_offset, |
| 1402 | 1 << irelalign->r_addend); |
| 1403 | if (alignto != alignaddr) |
| 1404 | { |
| 1405 | /* Tail recursion. */ |
| 1406 | return sh_elf_relax_delete_bytes (abfd, sec, alignaddr, |
| 1407 | alignto - alignaddr); |
| 1408 | } |
| 1409 | } |
| 1410 | |
| 1411 | return true; |
| 1412 | } |
| 1413 | |
| 1414 | /* Look for loads and stores which we can align to four byte |
| 1415 | boundaries. This is like sh_align_loads in coff-sh.c. */ |
| 1416 | |
| 1417 | static boolean |
| 1418 | sh_elf_align_loads (abfd, sec, internal_relocs, contents, pswapped) |
| 1419 | bfd *abfd; |
| 1420 | asection *sec; |
| 1421 | Elf_Internal_Rela *internal_relocs; |
| 1422 | bfd_byte *contents; |
| 1423 | boolean *pswapped; |
| 1424 | { |
| 1425 | Elf_Internal_Rela *irel, *irelend; |
| 1426 | bfd_vma *labels = NULL; |
| 1427 | bfd_vma *label, *label_end; |
| 1428 | |
| 1429 | *pswapped = false; |
| 1430 | |
| 1431 | irelend = internal_relocs + sec->reloc_count; |
| 1432 | |
| 1433 | /* Get all the addresses with labels on them. */ |
| 1434 | labels = (bfd_vma *) bfd_malloc (sec->reloc_count * sizeof (bfd_vma)); |
| 1435 | if (labels == NULL) |
| 1436 | goto error_return; |
| 1437 | label_end = labels; |
| 1438 | for (irel = internal_relocs; irel < irelend; irel++) |
| 1439 | { |
| 1440 | if (ELF32_R_TYPE (irel->r_info) == (int) R_SH_LABEL) |
| 1441 | { |
| 1442 | *label_end = irel->r_offset; |
| 1443 | ++label_end; |
| 1444 | } |
| 1445 | } |
| 1446 | |
| 1447 | /* Note that the assembler currently always outputs relocs in |
| 1448 | address order. If that ever changes, this code will need to sort |
| 1449 | the label values and the relocs. */ |
| 1450 | |
| 1451 | label = labels; |
| 1452 | |
| 1453 | for (irel = internal_relocs; irel < irelend; irel++) |
| 1454 | { |
| 1455 | bfd_vma start, stop; |
| 1456 | |
| 1457 | if (ELF32_R_TYPE (irel->r_info) != (int) R_SH_CODE) |
| 1458 | continue; |
| 1459 | |
| 1460 | start = irel->r_offset; |
| 1461 | |
| 1462 | for (irel++; irel < irelend; irel++) |
| 1463 | if (ELF32_R_TYPE (irel->r_info) == (int) R_SH_DATA) |
| 1464 | break; |
| 1465 | if (irel < irelend) |
| 1466 | stop = irel->r_offset; |
| 1467 | else |
| 1468 | stop = sec->_cooked_size; |
| 1469 | |
| 1470 | if (! _bfd_sh_align_load_span (abfd, sec, contents, sh_elf_swap_insns, |
| 1471 | (PTR) internal_relocs, &label, |
| 1472 | label_end, start, stop, pswapped)) |
| 1473 | goto error_return; |
| 1474 | } |
| 1475 | |
| 1476 | free (labels); |
| 1477 | |
| 1478 | return true; |
| 1479 | |
| 1480 | error_return: |
| 1481 | if (labels != NULL) |
| 1482 | free (labels); |
| 1483 | return false; |
| 1484 | } |
| 1485 | |
| 1486 | /* Swap two SH instructions. This is like sh_swap_insns in coff-sh.c. */ |
| 1487 | |
| 1488 | static boolean |
| 1489 | sh_elf_swap_insns (abfd, sec, relocs, contents, addr) |
| 1490 | bfd *abfd; |
| 1491 | asection *sec; |
| 1492 | PTR relocs; |
| 1493 | bfd_byte *contents; |
| 1494 | bfd_vma addr; |
| 1495 | { |
| 1496 | Elf_Internal_Rela *internal_relocs = (Elf_Internal_Rela *) relocs; |
| 1497 | unsigned short i1, i2; |
| 1498 | Elf_Internal_Rela *irel, *irelend; |
| 1499 | |
| 1500 | /* Swap the instructions themselves. */ |
| 1501 | i1 = bfd_get_16 (abfd, contents + addr); |
| 1502 | i2 = bfd_get_16 (abfd, contents + addr + 2); |
| 1503 | bfd_put_16 (abfd, i2, contents + addr); |
| 1504 | bfd_put_16 (abfd, i1, contents + addr + 2); |
| 1505 | |
| 1506 | /* Adjust all reloc addresses. */ |
| 1507 | irelend = internal_relocs + sec->reloc_count; |
| 1508 | for (irel = internal_relocs; irel < irelend; irel++) |
| 1509 | { |
| 1510 | enum elf_sh_reloc_type type; |
| 1511 | int add; |
| 1512 | |
| 1513 | /* There are a few special types of relocs that we don't want to |
| 1514 | adjust. These relocs do not apply to the instruction itself, |
| 1515 | but are only associated with the address. */ |
| 1516 | type = (enum elf_sh_reloc_type) ELF32_R_TYPE (irel->r_info); |
| 1517 | if (type == R_SH_ALIGN |
| 1518 | || type == R_SH_CODE |
| 1519 | || type == R_SH_DATA |
| 1520 | || type == R_SH_LABEL) |
| 1521 | continue; |
| 1522 | |
| 1523 | /* If an R_SH_USES reloc points to one of the addresses being |
| 1524 | swapped, we must adjust it. It would be incorrect to do this |
| 1525 | for a jump, though, since we want to execute both |
| 1526 | instructions after the jump. (We have avoided swapping |
| 1527 | around a label, so the jump will not wind up executing an |
| 1528 | instruction it shouldn't). */ |
| 1529 | if (type == R_SH_USES) |
| 1530 | { |
| 1531 | bfd_vma off; |
| 1532 | |
| 1533 | off = irel->r_offset + 4 + irel->r_addend; |
| 1534 | if (off == addr) |
| 1535 | irel->r_offset += 2; |
| 1536 | else if (off == addr + 2) |
| 1537 | irel->r_offset -= 2; |
| 1538 | } |
| 1539 | |
| 1540 | if (irel->r_offset == addr) |
| 1541 | { |
| 1542 | irel->r_offset += 2; |
| 1543 | add = -2; |
| 1544 | } |
| 1545 | else if (irel->r_offset == addr + 2) |
| 1546 | { |
| 1547 | irel->r_offset -= 2; |
| 1548 | add = 2; |
| 1549 | } |
| 1550 | else |
| 1551 | add = 0; |
| 1552 | |
| 1553 | if (add != 0) |
| 1554 | { |
| 1555 | bfd_byte *loc; |
| 1556 | unsigned short insn, oinsn; |
| 1557 | boolean overflow; |
| 1558 | |
| 1559 | loc = contents + irel->r_offset; |
| 1560 | overflow = false; |
| 1561 | switch (type) |
| 1562 | { |
| 1563 | default: |
| 1564 | break; |
| 1565 | |
| 1566 | case R_SH_DIR8WPN: |
| 1567 | case R_SH_DIR8WPZ: |
| 1568 | insn = bfd_get_16 (abfd, loc); |
| 1569 | oinsn = insn; |
| 1570 | insn += add / 2; |
| 1571 | if ((oinsn & 0xff00) != (insn & 0xff00)) |
| 1572 | overflow = true; |
| 1573 | bfd_put_16 (abfd, insn, loc); |
| 1574 | break; |
| 1575 | |
| 1576 | case R_SH_IND12W: |
| 1577 | insn = bfd_get_16 (abfd, loc); |
| 1578 | oinsn = insn; |
| 1579 | insn += add / 2; |
| 1580 | if ((oinsn & 0xf000) != (insn & 0xf000)) |
| 1581 | overflow = true; |
| 1582 | bfd_put_16 (abfd, insn, loc); |
| 1583 | break; |
| 1584 | |
| 1585 | case R_SH_DIR8WPL: |
| 1586 | /* This reloc ignores the least significant 3 bits of |
| 1587 | the program counter before adding in the offset. |
| 1588 | This means that if ADDR is at an even address, the |
| 1589 | swap will not affect the offset. If ADDR is an at an |
| 1590 | odd address, then the instruction will be crossing a |
| 1591 | four byte boundary, and must be adjusted. */ |
| 1592 | if ((addr & 3) != 0) |
| 1593 | { |
| 1594 | insn = bfd_get_16 (abfd, loc); |
| 1595 | oinsn = insn; |
| 1596 | insn += add / 2; |
| 1597 | if ((oinsn & 0xff00) != (insn & 0xff00)) |
| 1598 | overflow = true; |
| 1599 | bfd_put_16 (abfd, insn, loc); |
| 1600 | } |
| 1601 | |
| 1602 | break; |
| 1603 | } |
| 1604 | |
| 1605 | if (overflow) |
| 1606 | { |
| 1607 | ((*_bfd_error_handler) |
| 1608 | (_("%s: 0x%lx: fatal: reloc overflow while relaxing"), |
| 1609 | bfd_get_filename (abfd), (unsigned long) irel->r_offset)); |
| 1610 | bfd_set_error (bfd_error_bad_value); |
| 1611 | return false; |
| 1612 | } |
| 1613 | } |
| 1614 | } |
| 1615 | |
| 1616 | return true; |
| 1617 | } |
| 1618 | \f |
| 1619 | /* Relocate an SH ELF section. */ |
| 1620 | |
| 1621 | static boolean |
| 1622 | sh_elf_relocate_section (output_bfd, info, input_bfd, input_section, |
| 1623 | contents, relocs, local_syms, local_sections) |
| 1624 | bfd *output_bfd; |
| 1625 | struct bfd_link_info *info; |
| 1626 | bfd *input_bfd; |
| 1627 | asection *input_section; |
| 1628 | bfd_byte *contents; |
| 1629 | Elf_Internal_Rela *relocs; |
| 1630 | Elf_Internal_Sym *local_syms; |
| 1631 | asection **local_sections; |
| 1632 | { |
| 1633 | Elf_Internal_Shdr *symtab_hdr; |
| 1634 | struct elf_link_hash_entry **sym_hashes; |
| 1635 | Elf_Internal_Rela *rel, *relend; |
| 1636 | |
| 1637 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 1638 | sym_hashes = elf_sym_hashes (input_bfd); |
| 1639 | |
| 1640 | rel = relocs; |
| 1641 | relend = relocs + input_section->reloc_count; |
| 1642 | for (; rel < relend; rel++) |
| 1643 | { |
| 1644 | int r_type; |
| 1645 | reloc_howto_type *howto; |
| 1646 | unsigned long r_symndx; |
| 1647 | Elf_Internal_Sym *sym; |
| 1648 | asection *sec; |
| 1649 | struct elf_link_hash_entry *h; |
| 1650 | bfd_vma relocation; |
| 1651 | bfd_vma addend = (bfd_vma)0; |
| 1652 | bfd_reloc_status_type r; |
| 1653 | |
| 1654 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 1655 | |
| 1656 | if (info->relocateable) |
| 1657 | { |
| 1658 | /* This is a relocateable link. We don't have to change |
| 1659 | anything, unless the reloc is against a section symbol, |
| 1660 | in which case we have to adjust according to where the |
| 1661 | section symbol winds up in the output section. */ |
| 1662 | if (r_symndx < symtab_hdr->sh_info) |
| 1663 | { |
| 1664 | sym = local_syms + r_symndx; |
| 1665 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) |
| 1666 | { |
| 1667 | sec = local_sections[r_symndx]; |
| 1668 | rel->r_addend += sec->output_offset + sym->st_value; |
| 1669 | } |
| 1670 | } |
| 1671 | |
| 1672 | continue; |
| 1673 | } |
| 1674 | |
| 1675 | r_type = ELF32_R_TYPE (rel->r_info); |
| 1676 | |
| 1677 | /* Many of the relocs are only used for relaxing, and are |
| 1678 | handled entirely by the relaxation code. */ |
| 1679 | if (r_type > (int) R_SH_LAST_INVALID_RELOC) |
| 1680 | continue; |
| 1681 | |
| 1682 | if (r_type < 0 |
| 1683 | || r_type >= (int) R_SH_FIRST_INVALID_RELOC) |
| 1684 | { |
| 1685 | bfd_set_error (bfd_error_bad_value); |
| 1686 | return false; |
| 1687 | } |
| 1688 | |
| 1689 | /* FIXME: This is certainly incorrect. However, it is how the |
| 1690 | COFF linker works. */ |
| 1691 | if (r_type != (int) R_SH_DIR32 |
| 1692 | && r_type != (int) R_SH_IND12W) |
| 1693 | continue; |
| 1694 | |
| 1695 | howto = sh_elf_howto_table + r_type; |
| 1696 | |
| 1697 | /* This is a final link. */ |
| 1698 | h = NULL; |
| 1699 | sym = NULL; |
| 1700 | sec = NULL; |
| 1701 | if (r_symndx < symtab_hdr->sh_info) |
| 1702 | { |
| 1703 | /* There is nothing to be done for an internal IND12W |
| 1704 | relocation. FIXME: This is probably wrong, but it's how |
| 1705 | the COFF relocations work. */ |
| 1706 | if (r_type == (int) R_SH_IND12W) |
| 1707 | continue; |
| 1708 | sym = local_syms + r_symndx; |
| 1709 | sec = local_sections[r_symndx]; |
| 1710 | relocation = (sec->output_section->vma |
| 1711 | + sec->output_offset |
| 1712 | + sym->st_value); |
| 1713 | } |
| 1714 | else |
| 1715 | { |
| 1716 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 1717 | while (h->root.type == bfd_link_hash_indirect |
| 1718 | || h->root.type == bfd_link_hash_warning) |
| 1719 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1720 | if (h->root.type == bfd_link_hash_defined |
| 1721 | || h->root.type == bfd_link_hash_defweak) |
| 1722 | { |
| 1723 | sec = h->root.u.def.section; |
| 1724 | relocation = (h->root.u.def.value |
| 1725 | + sec->output_section->vma |
| 1726 | + sec->output_offset); |
| 1727 | } |
| 1728 | else if (h->root.type == bfd_link_hash_undefweak) |
| 1729 | relocation = 0; |
| 1730 | else |
| 1731 | { |
| 1732 | if (! ((*info->callbacks->undefined_symbol) |
| 1733 | (info, h->root.root.string, input_bfd, |
| 1734 | input_section, rel->r_offset))) |
| 1735 | return false; |
| 1736 | relocation = 0; |
| 1737 | } |
| 1738 | } |
| 1739 | |
| 1740 | /* FIXME: This is how the COFF relocations work. */ |
| 1741 | if (r_type == (int) R_SH_IND12W) |
| 1742 | relocation -= 4; |
| 1743 | |
| 1744 | switch ((int)r_type) |
| 1745 | { |
| 1746 | case (int)R_SH_DIR32: |
| 1747 | addend = rel->r_addend; |
| 1748 | break; |
| 1749 | } |
| 1750 | |
| 1751 | /* COFF relocs don't use the addend. The addend is used for R_SH_DIR32 |
| 1752 | to be compatible with other compilers. */ |
| 1753 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 1754 | contents, rel->r_offset, |
| 1755 | relocation, addend); |
| 1756 | |
| 1757 | if (r != bfd_reloc_ok) |
| 1758 | { |
| 1759 | switch (r) |
| 1760 | { |
| 1761 | default: |
| 1762 | case bfd_reloc_outofrange: |
| 1763 | abort (); |
| 1764 | case bfd_reloc_overflow: |
| 1765 | { |
| 1766 | const char *name; |
| 1767 | |
| 1768 | if (h != NULL) |
| 1769 | name = h->root.root.string; |
| 1770 | else |
| 1771 | { |
| 1772 | name = (bfd_elf_string_from_elf_section |
| 1773 | (input_bfd, symtab_hdr->sh_link, sym->st_name)); |
| 1774 | if (name == NULL) |
| 1775 | return false; |
| 1776 | if (*name == '\0') |
| 1777 | name = bfd_section_name (input_bfd, sec); |
| 1778 | } |
| 1779 | if (! ((*info->callbacks->reloc_overflow) |
| 1780 | (info, name, howto->name, (bfd_vma) 0, |
| 1781 | input_bfd, input_section, rel->r_offset))) |
| 1782 | return false; |
| 1783 | } |
| 1784 | break; |
| 1785 | } |
| 1786 | } |
| 1787 | } |
| 1788 | |
| 1789 | return true; |
| 1790 | } |
| 1791 | |
| 1792 | /* This is a version of bfd_generic_get_relocated_section_contents |
| 1793 | which uses sh_elf_relocate_section. */ |
| 1794 | |
| 1795 | static bfd_byte * |
| 1796 | sh_elf_get_relocated_section_contents (output_bfd, link_info, link_order, |
| 1797 | data, relocateable, symbols) |
| 1798 | bfd *output_bfd; |
| 1799 | struct bfd_link_info *link_info; |
| 1800 | struct bfd_link_order *link_order; |
| 1801 | bfd_byte *data; |
| 1802 | boolean relocateable; |
| 1803 | asymbol **symbols; |
| 1804 | { |
| 1805 | Elf_Internal_Shdr *symtab_hdr; |
| 1806 | asection *input_section = link_order->u.indirect.section; |
| 1807 | bfd *input_bfd = input_section->owner; |
| 1808 | asection **sections = NULL; |
| 1809 | Elf_Internal_Rela *internal_relocs = NULL; |
| 1810 | Elf32_External_Sym *external_syms = NULL; |
| 1811 | Elf_Internal_Sym *internal_syms = NULL; |
| 1812 | |
| 1813 | /* We only need to handle the case of relaxing, or of having a |
| 1814 | particular set of section contents, specially. */ |
| 1815 | if (relocateable |
| 1816 | || elf_section_data (input_section)->this_hdr.contents == NULL) |
| 1817 | return bfd_generic_get_relocated_section_contents (output_bfd, link_info, |
| 1818 | link_order, data, |
| 1819 | relocateable, |
| 1820 | symbols); |
| 1821 | |
| 1822 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 1823 | |
| 1824 | memcpy (data, elf_section_data (input_section)->this_hdr.contents, |
| 1825 | input_section->_raw_size); |
| 1826 | |
| 1827 | if ((input_section->flags & SEC_RELOC) != 0 |
| 1828 | && input_section->reloc_count > 0) |
| 1829 | { |
| 1830 | Elf_Internal_Sym *isymp; |
| 1831 | asection **secpp; |
| 1832 | Elf32_External_Sym *esym, *esymend; |
| 1833 | |
| 1834 | if (symtab_hdr->contents != NULL) |
| 1835 | external_syms = (Elf32_External_Sym *) symtab_hdr->contents; |
| 1836 | else |
| 1837 | { |
| 1838 | external_syms = ((Elf32_External_Sym *) |
| 1839 | bfd_malloc (symtab_hdr->sh_info |
| 1840 | * sizeof (Elf32_External_Sym))); |
| 1841 | if (external_syms == NULL && symtab_hdr->sh_info > 0) |
| 1842 | goto error_return; |
| 1843 | if (bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0 |
| 1844 | || (bfd_read (external_syms, sizeof (Elf32_External_Sym), |
| 1845 | symtab_hdr->sh_info, input_bfd) |
| 1846 | != (symtab_hdr->sh_info * sizeof (Elf32_External_Sym)))) |
| 1847 | goto error_return; |
| 1848 | } |
| 1849 | |
| 1850 | internal_relocs = (_bfd_elf32_link_read_relocs |
| 1851 | (input_bfd, input_section, (PTR) NULL, |
| 1852 | (Elf_Internal_Rela *) NULL, false)); |
| 1853 | if (internal_relocs == NULL) |
| 1854 | goto error_return; |
| 1855 | |
| 1856 | internal_syms = ((Elf_Internal_Sym *) |
| 1857 | bfd_malloc (symtab_hdr->sh_info |
| 1858 | * sizeof (Elf_Internal_Sym))); |
| 1859 | if (internal_syms == NULL && symtab_hdr->sh_info > 0) |
| 1860 | goto error_return; |
| 1861 | |
| 1862 | sections = (asection **) bfd_malloc (symtab_hdr->sh_info |
| 1863 | * sizeof (asection *)); |
| 1864 | if (sections == NULL && symtab_hdr->sh_info > 0) |
| 1865 | goto error_return; |
| 1866 | |
| 1867 | isymp = internal_syms; |
| 1868 | secpp = sections; |
| 1869 | esym = external_syms; |
| 1870 | esymend = esym + symtab_hdr->sh_info; |
| 1871 | for (; esym < esymend; ++esym, ++isymp, ++secpp) |
| 1872 | { |
| 1873 | asection *isec; |
| 1874 | |
| 1875 | bfd_elf32_swap_symbol_in (input_bfd, esym, isymp); |
| 1876 | |
| 1877 | if (isymp->st_shndx == SHN_UNDEF) |
| 1878 | isec = bfd_und_section_ptr; |
| 1879 | else if (isymp->st_shndx > 0 && isymp->st_shndx < SHN_LORESERVE) |
| 1880 | isec = bfd_section_from_elf_index (input_bfd, isymp->st_shndx); |
| 1881 | else if (isymp->st_shndx == SHN_ABS) |
| 1882 | isec = bfd_abs_section_ptr; |
| 1883 | else if (isymp->st_shndx == SHN_COMMON) |
| 1884 | isec = bfd_com_section_ptr; |
| 1885 | else |
| 1886 | { |
| 1887 | /* Who knows? */ |
| 1888 | isec = NULL; |
| 1889 | } |
| 1890 | |
| 1891 | *secpp = isec; |
| 1892 | } |
| 1893 | |
| 1894 | if (! sh_elf_relocate_section (output_bfd, link_info, input_bfd, |
| 1895 | input_section, data, internal_relocs, |
| 1896 | internal_syms, sections)) |
| 1897 | goto error_return; |
| 1898 | |
| 1899 | if (sections != NULL) |
| 1900 | free (sections); |
| 1901 | sections = NULL; |
| 1902 | if (internal_syms != NULL) |
| 1903 | free (internal_syms); |
| 1904 | internal_syms = NULL; |
| 1905 | if (external_syms != NULL && symtab_hdr->contents == NULL) |
| 1906 | free (external_syms); |
| 1907 | external_syms = NULL; |
| 1908 | if (internal_relocs != elf_section_data (input_section)->relocs) |
| 1909 | free (internal_relocs); |
| 1910 | internal_relocs = NULL; |
| 1911 | } |
| 1912 | |
| 1913 | return data; |
| 1914 | |
| 1915 | error_return: |
| 1916 | if (internal_relocs != NULL |
| 1917 | && internal_relocs != elf_section_data (input_section)->relocs) |
| 1918 | free (internal_relocs); |
| 1919 | if (external_syms != NULL && symtab_hdr->contents == NULL) |
| 1920 | free (external_syms); |
| 1921 | if (internal_syms != NULL) |
| 1922 | free (internal_syms); |
| 1923 | if (sections != NULL) |
| 1924 | free (sections); |
| 1925 | return NULL; |
| 1926 | } |
| 1927 | static asection * |
| 1928 | sh_elf_gc_mark_hook (abfd, info, rel, h, sym) |
| 1929 | bfd *abfd; |
| 1930 | struct bfd_link_info *info; |
| 1931 | Elf_Internal_Rela *rel; |
| 1932 | struct elf_link_hash_entry *h; |
| 1933 | Elf_Internal_Sym *sym; |
| 1934 | { |
| 1935 | if (h != NULL) |
| 1936 | { |
| 1937 | switch (ELF32_R_TYPE (rel->r_info)) |
| 1938 | { |
| 1939 | case R_SH_GNU_VTINHERIT: |
| 1940 | case R_SH_GNU_VTENTRY: |
| 1941 | break; |
| 1942 | |
| 1943 | default: |
| 1944 | switch (h->root.type) |
| 1945 | { |
| 1946 | case bfd_link_hash_defined: |
| 1947 | case bfd_link_hash_defweak: |
| 1948 | return h->root.u.def.section; |
| 1949 | |
| 1950 | case bfd_link_hash_common: |
| 1951 | return h->root.u.c.p->section; |
| 1952 | } |
| 1953 | } |
| 1954 | } |
| 1955 | else |
| 1956 | { |
| 1957 | if (!(elf_bad_symtab (abfd) |
| 1958 | && ELF_ST_BIND (sym->st_info) != STB_LOCAL) |
| 1959 | && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE) |
| 1960 | && sym->st_shndx != SHN_COMMON)) |
| 1961 | { |
| 1962 | return bfd_section_from_elf_index (abfd, sym->st_shndx); |
| 1963 | } |
| 1964 | } |
| 1965 | return NULL; |
| 1966 | } |
| 1967 | |
| 1968 | static boolean |
| 1969 | sh_elf_gc_sweep_hook (abfd, info, sec, relocs) |
| 1970 | bfd *abfd; |
| 1971 | struct bfd_link_info *info; |
| 1972 | asection *sec; |
| 1973 | const Elf_Internal_Rela *relocs; |
| 1974 | { |
| 1975 | /* we don't use got and plt entries for sh. */ |
| 1976 | return true; |
| 1977 | } |
| 1978 | |
| 1979 | /* Look through the relocs for a section during the first phase. |
| 1980 | Since we don't do .gots or .plts, we just need to consider the |
| 1981 | virtual table relocs for gc. */ |
| 1982 | |
| 1983 | static boolean |
| 1984 | sh_elf_check_relocs (abfd, info, sec, relocs) |
| 1985 | bfd *abfd; |
| 1986 | struct bfd_link_info *info; |
| 1987 | asection *sec; |
| 1988 | const Elf_Internal_Rela *relocs; |
| 1989 | { |
| 1990 | Elf_Internal_Shdr *symtab_hdr; |
| 1991 | struct elf_link_hash_entry **sym_hashes, **sym_hashes_end; |
| 1992 | const Elf_Internal_Rela *rel; |
| 1993 | const Elf_Internal_Rela *rel_end; |
| 1994 | |
| 1995 | if (info->relocateable) |
| 1996 | return true; |
| 1997 | |
| 1998 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 1999 | sym_hashes = elf_sym_hashes (abfd); |
| 2000 | sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof(Elf32_External_Sym); |
| 2001 | if (!elf_bad_symtab (abfd)) |
| 2002 | sym_hashes_end -= symtab_hdr->sh_info; |
| 2003 | |
| 2004 | rel_end = relocs + sec->reloc_count; |
| 2005 | for (rel = relocs; rel < rel_end; rel++) |
| 2006 | { |
| 2007 | struct elf_link_hash_entry *h; |
| 2008 | unsigned long r_symndx; |
| 2009 | |
| 2010 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 2011 | if (r_symndx < symtab_hdr->sh_info) |
| 2012 | h = NULL; |
| 2013 | else |
| 2014 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 2015 | |
| 2016 | switch (ELF32_R_TYPE (rel->r_info)) |
| 2017 | { |
| 2018 | /* This relocation describes the C++ object vtable hierarchy. |
| 2019 | Reconstruct it for later use during GC. */ |
| 2020 | case R_SH_GNU_VTINHERIT: |
| 2021 | if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) |
| 2022 | return false; |
| 2023 | break; |
| 2024 | |
| 2025 | /* This relocation describes which C++ vtable entries are actually |
| 2026 | used. Record for later use during GC. */ |
| 2027 | case R_SH_GNU_VTENTRY: |
| 2028 | if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend)) |
| 2029 | return false; |
| 2030 | break; |
| 2031 | } |
| 2032 | } |
| 2033 | |
| 2034 | return true; |
| 2035 | } |
| 2036 | |
| 2037 | #define TARGET_BIG_SYM bfd_elf32_sh_vec |
| 2038 | #define TARGET_BIG_NAME "elf32-sh" |
| 2039 | #define TARGET_LITTLE_SYM bfd_elf32_shl_vec |
| 2040 | #define TARGET_LITTLE_NAME "elf32-shl" |
| 2041 | #define ELF_ARCH bfd_arch_sh |
| 2042 | #define ELF_MACHINE_CODE EM_SH |
| 2043 | #define ELF_MAXPAGESIZE 0x1 |
| 2044 | |
| 2045 | #define elf_symbol_leading_char '_' |
| 2046 | |
| 2047 | #define bfd_elf32_bfd_reloc_type_lookup sh_elf_reloc_type_lookup |
| 2048 | #define elf_info_to_howto sh_elf_info_to_howto |
| 2049 | #define bfd_elf32_bfd_relax_section sh_elf_relax_section |
| 2050 | #define elf_backend_relocate_section sh_elf_relocate_section |
| 2051 | #define bfd_elf32_bfd_get_relocated_section_contents \ |
| 2052 | sh_elf_get_relocated_section_contents |
| 2053 | |
| 2054 | #define elf_backend_gc_mark_hook sh_elf_gc_mark_hook |
| 2055 | #define elf_backend_gc_sweep_hook sh_elf_gc_sweep_hook |
| 2056 | #define elf_backend_check_relocs sh_elf_check_relocs |
| 2057 | |
| 2058 | #define elf_backend_can_gc_sections 1 |
| 2059 | #include "elf32-target.h" |