| 1 | /* BFD back-end for National Semiconductor's CRX ELF |
| 2 | Copyright (C) 2004-2019 Free Software Foundation, Inc. |
| 3 | Written by Tomer Levi, NSC, Israel. |
| 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 3 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., 51 Franklin Street - Fifth Floor, Boston, |
| 20 | MA 02110-1301, USA. */ |
| 21 | |
| 22 | #include "sysdep.h" |
| 23 | #include "bfd.h" |
| 24 | #include "bfdlink.h" |
| 25 | #include "libbfd.h" |
| 26 | #include "elf-bfd.h" |
| 27 | #include "elf/crx.h" |
| 28 | |
| 29 | static reloc_howto_type *elf_crx_reloc_type_lookup |
| 30 | (bfd *, bfd_reloc_code_real_type); |
| 31 | static bfd_boolean elf_crx_info_to_howto |
| 32 | (bfd *, arelent *, Elf_Internal_Rela *); |
| 33 | static bfd_boolean elf32_crx_relax_delete_bytes |
| 34 | (struct bfd_link_info *, bfd *, asection *, bfd_vma, int); |
| 35 | static bfd_reloc_status_type crx_elf_final_link_relocate |
| 36 | (reloc_howto_type *, bfd *, bfd *, asection *, |
| 37 | bfd_byte *, bfd_vma, bfd_vma, bfd_vma, |
| 38 | struct bfd_link_info *, asection *, int); |
| 39 | static bfd_boolean elf32_crx_relocate_section |
| 40 | (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, |
| 41 | Elf_Internal_Rela *, Elf_Internal_Sym *, asection **); |
| 42 | static bfd_boolean elf32_crx_relax_section |
| 43 | (bfd *, asection *, struct bfd_link_info *, bfd_boolean *); |
| 44 | static bfd_byte * elf32_crx_get_relocated_section_contents |
| 45 | (bfd *, struct bfd_link_info *, struct bfd_link_order *, |
| 46 | bfd_byte *, bfd_boolean, asymbol **); |
| 47 | |
| 48 | /* crx_reloc_map array maps BFD relocation enum into a CRGAS relocation type. */ |
| 49 | |
| 50 | struct crx_reloc_map |
| 51 | { |
| 52 | bfd_reloc_code_real_type bfd_reloc_enum; /* BFD relocation enum. */ |
| 53 | unsigned short crx_reloc_type; /* CRX relocation type. */ |
| 54 | }; |
| 55 | |
| 56 | static const struct crx_reloc_map crx_reloc_map[R_CRX_MAX] = |
| 57 | { |
| 58 | {BFD_RELOC_NONE, R_CRX_NONE}, |
| 59 | {BFD_RELOC_CRX_REL4, R_CRX_REL4}, |
| 60 | {BFD_RELOC_CRX_REL8, R_CRX_REL8}, |
| 61 | {BFD_RELOC_CRX_REL8_CMP, R_CRX_REL8_CMP}, |
| 62 | {BFD_RELOC_CRX_REL16, R_CRX_REL16}, |
| 63 | {BFD_RELOC_CRX_REL24, R_CRX_REL24}, |
| 64 | {BFD_RELOC_CRX_REL32, R_CRX_REL32}, |
| 65 | {BFD_RELOC_CRX_REGREL12, R_CRX_REGREL12}, |
| 66 | {BFD_RELOC_CRX_REGREL22, R_CRX_REGREL22}, |
| 67 | {BFD_RELOC_CRX_REGREL28, R_CRX_REGREL28}, |
| 68 | {BFD_RELOC_CRX_REGREL32, R_CRX_REGREL32}, |
| 69 | {BFD_RELOC_CRX_ABS16, R_CRX_ABS16}, |
| 70 | {BFD_RELOC_CRX_ABS32, R_CRX_ABS32}, |
| 71 | {BFD_RELOC_CRX_NUM8, R_CRX_NUM8}, |
| 72 | {BFD_RELOC_CRX_NUM16, R_CRX_NUM16}, |
| 73 | {BFD_RELOC_CRX_NUM32, R_CRX_NUM32}, |
| 74 | {BFD_RELOC_CRX_IMM16, R_CRX_IMM16}, |
| 75 | {BFD_RELOC_CRX_IMM32, R_CRX_IMM32}, |
| 76 | {BFD_RELOC_CRX_SWITCH8, R_CRX_SWITCH8}, |
| 77 | {BFD_RELOC_CRX_SWITCH16, R_CRX_SWITCH16}, |
| 78 | {BFD_RELOC_CRX_SWITCH32, R_CRX_SWITCH32} |
| 79 | }; |
| 80 | |
| 81 | static reloc_howto_type crx_elf_howto_table[] = |
| 82 | { |
| 83 | HOWTO (R_CRX_NONE, /* type */ |
| 84 | 0, /* rightshift */ |
| 85 | 3, /* size */ |
| 86 | 0, /* bitsize */ |
| 87 | FALSE, /* pc_relative */ |
| 88 | 0, /* bitpos */ |
| 89 | complain_overflow_dont,/* complain_on_overflow */ |
| 90 | bfd_elf_generic_reloc, /* special_function */ |
| 91 | "R_CRX_NONE", /* name */ |
| 92 | FALSE, /* partial_inplace */ |
| 93 | 0, /* src_mask */ |
| 94 | 0, /* dst_mask */ |
| 95 | FALSE), /* pcrel_offset */ |
| 96 | |
| 97 | HOWTO (R_CRX_REL4, /* type */ |
| 98 | 1, /* rightshift */ |
| 99 | 0, /* size */ |
| 100 | 4, /* bitsize */ |
| 101 | TRUE, /* pc_relative */ |
| 102 | 0, /* bitpos */ |
| 103 | complain_overflow_bitfield,/* complain_on_overflow */ |
| 104 | bfd_elf_generic_reloc, /* special_function */ |
| 105 | "R_CRX_REL4", /* name */ |
| 106 | FALSE, /* partial_inplace */ |
| 107 | 0x0, /* src_mask */ |
| 108 | 0xf, /* dst_mask */ |
| 109 | FALSE), /* pcrel_offset */ |
| 110 | |
| 111 | HOWTO (R_CRX_REL8, /* type */ |
| 112 | 1, /* rightshift */ |
| 113 | 0, /* size */ |
| 114 | 8, /* bitsize */ |
| 115 | TRUE, /* pc_relative */ |
| 116 | 0, /* bitpos */ |
| 117 | complain_overflow_bitfield,/* complain_on_overflow */ |
| 118 | bfd_elf_generic_reloc, /* special_function */ |
| 119 | "R_CRX_REL8", /* name */ |
| 120 | FALSE, /* partial_inplace */ |
| 121 | 0x0, /* src_mask */ |
| 122 | 0xff, /* dst_mask */ |
| 123 | FALSE), /* pcrel_offset */ |
| 124 | |
| 125 | HOWTO (R_CRX_REL8_CMP, /* type */ |
| 126 | 1, /* rightshift */ |
| 127 | 0, /* size */ |
| 128 | 8, /* bitsize */ |
| 129 | TRUE, /* pc_relative */ |
| 130 | 0, /* bitpos */ |
| 131 | complain_overflow_bitfield,/* complain_on_overflow */ |
| 132 | bfd_elf_generic_reloc, /* special_function */ |
| 133 | "R_CRX_REL8_CMP", /* name */ |
| 134 | FALSE, /* partial_inplace */ |
| 135 | 0x0, /* src_mask */ |
| 136 | 0xff, /* dst_mask */ |
| 137 | FALSE), /* pcrel_offset */ |
| 138 | |
| 139 | HOWTO (R_CRX_REL16, /* type */ |
| 140 | 1, /* rightshift */ |
| 141 | 1, /* size */ |
| 142 | 16, /* bitsize */ |
| 143 | TRUE, /* pc_relative */ |
| 144 | 0, /* bitpos */ |
| 145 | complain_overflow_bitfield,/* complain_on_overflow */ |
| 146 | bfd_elf_generic_reloc, /* special_function */ |
| 147 | "R_CRX_REL16", /* name */ |
| 148 | FALSE, /* partial_inplace */ |
| 149 | 0x0, /* src_mask */ |
| 150 | 0xffff, /* dst_mask */ |
| 151 | FALSE), /* pcrel_offset */ |
| 152 | |
| 153 | HOWTO (R_CRX_REL24, /* type */ |
| 154 | 1, /* rightshift */ |
| 155 | 2, /* size */ |
| 156 | 24, /* bitsize */ |
| 157 | TRUE, /* pc_relative */ |
| 158 | 0, /* bitpos */ |
| 159 | complain_overflow_bitfield,/* complain_on_overflow */ |
| 160 | bfd_elf_generic_reloc, /* special_function */ |
| 161 | "R_CRX_REL24", /* name */ |
| 162 | FALSE, /* partial_inplace */ |
| 163 | 0x0, /* src_mask */ |
| 164 | 0xffffff, /* dst_mask */ |
| 165 | FALSE), /* pcrel_offset */ |
| 166 | |
| 167 | HOWTO (R_CRX_REL32, /* type */ |
| 168 | 1, /* rightshift */ |
| 169 | 2, /* size */ |
| 170 | 32, /* bitsize */ |
| 171 | TRUE, /* pc_relative */ |
| 172 | 0, /* bitpos */ |
| 173 | complain_overflow_bitfield,/* complain_on_overflow */ |
| 174 | bfd_elf_generic_reloc, /* special_function */ |
| 175 | "R_CRX_REL32", /* name */ |
| 176 | FALSE, /* partial_inplace */ |
| 177 | 0x0, /* src_mask */ |
| 178 | 0xffffffff, /* dst_mask */ |
| 179 | FALSE), /* pcrel_offset */ |
| 180 | |
| 181 | HOWTO (R_CRX_REGREL12, /* type */ |
| 182 | 0, /* rightshift */ |
| 183 | 1, /* size */ |
| 184 | 12, /* bitsize */ |
| 185 | FALSE, /* pc_relative */ |
| 186 | 0, /* bitpos */ |
| 187 | complain_overflow_bitfield,/* complain_on_overflow */ |
| 188 | bfd_elf_generic_reloc, /* special_function */ |
| 189 | "R_CRX_REGREL12", /* name */ |
| 190 | FALSE, /* partial_inplace */ |
| 191 | 0x0, /* src_mask */ |
| 192 | 0xfff, /* dst_mask */ |
| 193 | FALSE), /* pcrel_offset */ |
| 194 | |
| 195 | HOWTO (R_CRX_REGREL22, /* type */ |
| 196 | 0, /* rightshift */ |
| 197 | 2, /* size */ |
| 198 | 22, /* bitsize */ |
| 199 | FALSE, /* pc_relative */ |
| 200 | 0, /* bitpos */ |
| 201 | complain_overflow_bitfield,/* complain_on_overflow */ |
| 202 | bfd_elf_generic_reloc, /* special_function */ |
| 203 | "R_CRX_REGREL22", /* name */ |
| 204 | FALSE, /* partial_inplace */ |
| 205 | 0x0, /* src_mask */ |
| 206 | 0x3fffff, /* dst_mask */ |
| 207 | FALSE), /* pcrel_offset */ |
| 208 | |
| 209 | HOWTO (R_CRX_REGREL28, /* type */ |
| 210 | 0, /* rightshift */ |
| 211 | 2, /* size */ |
| 212 | 28, /* bitsize */ |
| 213 | FALSE, /* pc_relative */ |
| 214 | 0, /* bitpos */ |
| 215 | complain_overflow_bitfield,/* complain_on_overflow */ |
| 216 | bfd_elf_generic_reloc, /* special_function */ |
| 217 | "R_CRX_REGREL28", /* name */ |
| 218 | FALSE, /* partial_inplace */ |
| 219 | 0x0, /* src_mask */ |
| 220 | 0xfffffff, /* dst_mask */ |
| 221 | FALSE), /* pcrel_offset */ |
| 222 | |
| 223 | HOWTO (R_CRX_REGREL32, /* type */ |
| 224 | 0, /* rightshift */ |
| 225 | 2, /* size */ |
| 226 | 32, /* bitsize */ |
| 227 | FALSE, /* pc_relative */ |
| 228 | 0, /* bitpos */ |
| 229 | complain_overflow_bitfield,/* complain_on_overflow */ |
| 230 | bfd_elf_generic_reloc, /* special_function */ |
| 231 | "R_CRX_REGREL32", /* name */ |
| 232 | FALSE, /* partial_inplace */ |
| 233 | 0x0, /* src_mask */ |
| 234 | 0xffffffff, /* dst_mask */ |
| 235 | FALSE), /* pcrel_offset */ |
| 236 | |
| 237 | HOWTO (R_CRX_ABS16, /* type */ |
| 238 | 0, /* rightshift */ |
| 239 | 1, /* size */ |
| 240 | 16, /* bitsize */ |
| 241 | FALSE, /* pc_relative */ |
| 242 | 0, /* bitpos */ |
| 243 | complain_overflow_bitfield,/* complain_on_overflow */ |
| 244 | bfd_elf_generic_reloc, /* special_function */ |
| 245 | "R_CRX_ABS16", /* name */ |
| 246 | FALSE, /* partial_inplace */ |
| 247 | 0x0, /* src_mask */ |
| 248 | 0xffff, /* dst_mask */ |
| 249 | FALSE), /* pcrel_offset */ |
| 250 | |
| 251 | HOWTO (R_CRX_ABS32, /* type */ |
| 252 | 0, /* rightshift */ |
| 253 | 2, /* size */ |
| 254 | 32, /* bitsize */ |
| 255 | FALSE, /* pc_relative */ |
| 256 | 0, /* bitpos */ |
| 257 | complain_overflow_bitfield,/* complain_on_overflow */ |
| 258 | bfd_elf_generic_reloc, /* special_function */ |
| 259 | "R_CRX_ABS32", /* name */ |
| 260 | FALSE, /* partial_inplace */ |
| 261 | 0x0, /* src_mask */ |
| 262 | 0xffffffff, /* dst_mask */ |
| 263 | FALSE), /* pcrel_offset */ |
| 264 | |
| 265 | HOWTO (R_CRX_NUM8, /* type */ |
| 266 | 0, /* rightshift */ |
| 267 | 0, /* size */ |
| 268 | 8, /* bitsize */ |
| 269 | FALSE, /* pc_relative */ |
| 270 | 0, /* bitpos */ |
| 271 | complain_overflow_bitfield,/* complain_on_overflow */ |
| 272 | bfd_elf_generic_reloc, /* special_function */ |
| 273 | "R_CRX_NUM8", /* name */ |
| 274 | FALSE, /* partial_inplace */ |
| 275 | 0x0, /* src_mask */ |
| 276 | 0xff, /* dst_mask */ |
| 277 | FALSE), /* pcrel_offset */ |
| 278 | |
| 279 | HOWTO (R_CRX_NUM16, /* type */ |
| 280 | 0, /* rightshift */ |
| 281 | 1, /* size */ |
| 282 | 16, /* bitsize */ |
| 283 | FALSE, /* pc_relative */ |
| 284 | 0, /* bitpos */ |
| 285 | complain_overflow_bitfield,/* complain_on_overflow */ |
| 286 | bfd_elf_generic_reloc, /* special_function */ |
| 287 | "R_CRX_NUM16", /* name */ |
| 288 | FALSE, /* partial_inplace */ |
| 289 | 0x0, /* src_mask */ |
| 290 | 0xffff, /* dst_mask */ |
| 291 | FALSE), /* pcrel_offset */ |
| 292 | |
| 293 | HOWTO (R_CRX_NUM32, /* type */ |
| 294 | 0, /* rightshift */ |
| 295 | 2, /* size */ |
| 296 | 32, /* bitsize */ |
| 297 | FALSE, /* pc_relative */ |
| 298 | 0, /* bitpos */ |
| 299 | complain_overflow_bitfield,/* complain_on_overflow */ |
| 300 | bfd_elf_generic_reloc, /* special_function */ |
| 301 | "R_CRX_NUM32", /* name */ |
| 302 | FALSE, /* partial_inplace */ |
| 303 | 0x0, /* src_mask */ |
| 304 | 0xffffffff, /* dst_mask */ |
| 305 | FALSE), /* pcrel_offset */ |
| 306 | |
| 307 | HOWTO (R_CRX_IMM16, /* type */ |
| 308 | 0, /* rightshift */ |
| 309 | 1, /* size */ |
| 310 | 16, /* bitsize */ |
| 311 | FALSE, /* pc_relative */ |
| 312 | 0, /* bitpos */ |
| 313 | complain_overflow_bitfield,/* complain_on_overflow */ |
| 314 | bfd_elf_generic_reloc, /* special_function */ |
| 315 | "R_CRX_IMM16", /* name */ |
| 316 | FALSE, /* partial_inplace */ |
| 317 | 0x0, /* src_mask */ |
| 318 | 0xffff, /* dst_mask */ |
| 319 | FALSE), /* pcrel_offset */ |
| 320 | |
| 321 | HOWTO (R_CRX_IMM32, /* type */ |
| 322 | 0, /* rightshift */ |
| 323 | 2, /* size */ |
| 324 | 32, /* bitsize */ |
| 325 | FALSE, /* pc_relative */ |
| 326 | 0, /* bitpos */ |
| 327 | complain_overflow_bitfield,/* complain_on_overflow */ |
| 328 | bfd_elf_generic_reloc, /* special_function */ |
| 329 | "R_CRX_IMM32", /* name */ |
| 330 | FALSE, /* partial_inplace */ |
| 331 | 0x0, /* src_mask */ |
| 332 | 0xffffffff, /* dst_mask */ |
| 333 | FALSE), /* pcrel_offset */ |
| 334 | |
| 335 | /* An 8 bit switch table entry. This is generated for an expression |
| 336 | such as ``.byte L1 - L2''. The offset holds the difference |
| 337 | between the reloc address and L2. */ |
| 338 | HOWTO (R_CRX_SWITCH8, /* type */ |
| 339 | 0, /* rightshift */ |
| 340 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 341 | 8, /* bitsize */ |
| 342 | FALSE, /* pc_relative */ |
| 343 | 0, /* bitpos */ |
| 344 | complain_overflow_unsigned, /* complain_on_overflow */ |
| 345 | bfd_elf_generic_reloc, /* special_function */ |
| 346 | "R_CRX_SWITCH8", /* name */ |
| 347 | FALSE, /* partial_inplace */ |
| 348 | 0x0, /* src_mask */ |
| 349 | 0xff, /* dst_mask */ |
| 350 | TRUE), /* pcrel_offset */ |
| 351 | |
| 352 | /* A 16 bit switch table entry. This is generated for an expression |
| 353 | such as ``.word L1 - L2''. The offset holds the difference |
| 354 | between the reloc address and L2. */ |
| 355 | HOWTO (R_CRX_SWITCH16, /* type */ |
| 356 | 0, /* rightshift */ |
| 357 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 358 | 16, /* bitsize */ |
| 359 | FALSE, /* pc_relative */ |
| 360 | 0, /* bitpos */ |
| 361 | complain_overflow_unsigned, /* complain_on_overflow */ |
| 362 | bfd_elf_generic_reloc, /* special_function */ |
| 363 | "R_CRX_SWITCH16", /* name */ |
| 364 | FALSE, /* partial_inplace */ |
| 365 | 0x0, /* src_mask */ |
| 366 | 0xffff, /* dst_mask */ |
| 367 | TRUE), /* pcrel_offset */ |
| 368 | |
| 369 | /* A 32 bit switch table entry. This is generated for an expression |
| 370 | such as ``.long L1 - L2''. The offset holds the difference |
| 371 | between the reloc address and L2. */ |
| 372 | HOWTO (R_CRX_SWITCH32, /* type */ |
| 373 | 0, /* rightshift */ |
| 374 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 375 | 32, /* bitsize */ |
| 376 | FALSE, /* pc_relative */ |
| 377 | 0, /* bitpos */ |
| 378 | complain_overflow_unsigned, /* complain_on_overflow */ |
| 379 | bfd_elf_generic_reloc, /* special_function */ |
| 380 | "R_CRX_SWITCH32", /* name */ |
| 381 | FALSE, /* partial_inplace */ |
| 382 | 0x0, /* src_mask */ |
| 383 | 0xffffffff, /* dst_mask */ |
| 384 | TRUE) /* pcrel_offset */ |
| 385 | }; |
| 386 | |
| 387 | /* Retrieve a howto ptr using a BFD reloc_code. */ |
| 388 | |
| 389 | static reloc_howto_type * |
| 390 | elf_crx_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 391 | bfd_reloc_code_real_type code) |
| 392 | { |
| 393 | unsigned int i; |
| 394 | |
| 395 | for (i = 0; i < R_CRX_MAX; i++) |
| 396 | if (code == crx_reloc_map[i].bfd_reloc_enum) |
| 397 | return &crx_elf_howto_table[crx_reloc_map[i].crx_reloc_type]; |
| 398 | |
| 399 | printf ("This relocation Type is not supported -0x%x\n", code); |
| 400 | return 0; |
| 401 | } |
| 402 | |
| 403 | static reloc_howto_type * |
| 404 | elf_crx_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 405 | const char *r_name) |
| 406 | { |
| 407 | unsigned int i; |
| 408 | |
| 409 | for (i = 0; |
| 410 | i < sizeof (crx_elf_howto_table) / sizeof (crx_elf_howto_table[0]); |
| 411 | i++) |
| 412 | if (crx_elf_howto_table[i].name != NULL |
| 413 | && strcasecmp (crx_elf_howto_table[i].name, r_name) == 0) |
| 414 | return &crx_elf_howto_table[i]; |
| 415 | |
| 416 | return NULL; |
| 417 | } |
| 418 | |
| 419 | /* Retrieve a howto ptr using an internal relocation entry. */ |
| 420 | |
| 421 | static bfd_boolean |
| 422 | elf_crx_info_to_howto (bfd *abfd, arelent *cache_ptr, |
| 423 | Elf_Internal_Rela *dst) |
| 424 | { |
| 425 | unsigned int r_type = ELF32_R_TYPE (dst->r_info); |
| 426 | if (r_type >= R_CRX_MAX) |
| 427 | { |
| 428 | /* xgettext:c-format */ |
| 429 | _bfd_error_handler (_("%pB: unsupported relocation type %#x"), |
| 430 | abfd, r_type); |
| 431 | bfd_set_error (bfd_error_bad_value); |
| 432 | return FALSE; |
| 433 | } |
| 434 | cache_ptr->howto = &crx_elf_howto_table[r_type]; |
| 435 | return TRUE; |
| 436 | } |
| 437 | |
| 438 | /* Perform a relocation as part of a final link. */ |
| 439 | |
| 440 | static bfd_reloc_status_type |
| 441 | crx_elf_final_link_relocate (reloc_howto_type *howto, bfd *input_bfd, |
| 442 | bfd *output_bfd ATTRIBUTE_UNUSED, |
| 443 | asection *input_section, bfd_byte *contents, |
| 444 | bfd_vma offset, bfd_vma Rvalue, bfd_vma addend, |
| 445 | struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 446 | asection *sec ATTRIBUTE_UNUSED, |
| 447 | int is_local ATTRIBUTE_UNUSED) |
| 448 | { |
| 449 | unsigned short r_type = howto->type; |
| 450 | bfd_byte *hit_data = contents + offset; |
| 451 | bfd_vma reloc_bits, check; |
| 452 | |
| 453 | switch (r_type) |
| 454 | { |
| 455 | case R_CRX_IMM16: |
| 456 | case R_CRX_IMM32: |
| 457 | case R_CRX_ABS16: |
| 458 | case R_CRX_ABS32: |
| 459 | case R_CRX_REL8_CMP: |
| 460 | case R_CRX_REL16: |
| 461 | case R_CRX_REL24: |
| 462 | case R_CRX_REL32: |
| 463 | case R_CRX_REGREL12: |
| 464 | case R_CRX_REGREL22: |
| 465 | case R_CRX_REGREL28: |
| 466 | case R_CRX_REGREL32: |
| 467 | /* 'hit_data' is relative to the start of the instruction, not the |
| 468 | relocation offset. Advance it to account for the exact offset. */ |
| 469 | hit_data += 2; |
| 470 | break; |
| 471 | |
| 472 | case R_CRX_REL4: |
| 473 | /* This relocation type is used only in 'Branch if Equal to 0' |
| 474 | instructions and requires special handling. */ |
| 475 | Rvalue -= 1; |
| 476 | break; |
| 477 | |
| 478 | case R_CRX_NONE: |
| 479 | return bfd_reloc_ok; |
| 480 | break; |
| 481 | |
| 482 | case R_CRX_SWITCH8: |
| 483 | case R_CRX_SWITCH16: |
| 484 | case R_CRX_SWITCH32: |
| 485 | /* We only care about the addend, where the difference between |
| 486 | expressions is kept. */ |
| 487 | Rvalue = 0; |
| 488 | |
| 489 | default: |
| 490 | break; |
| 491 | } |
| 492 | |
| 493 | if (howto->pc_relative) |
| 494 | { |
| 495 | /* Subtract the address of the section containing the location. */ |
| 496 | Rvalue -= (input_section->output_section->vma |
| 497 | + input_section->output_offset); |
| 498 | /* Subtract the position of the location within the section. */ |
| 499 | Rvalue -= offset; |
| 500 | } |
| 501 | |
| 502 | /* Add in supplied addend. */ |
| 503 | Rvalue += addend; |
| 504 | |
| 505 | /* Complain if the bitfield overflows, whether it is considered |
| 506 | as signed or unsigned. */ |
| 507 | check = Rvalue >> howto->rightshift; |
| 508 | |
| 509 | /* Assumes two's complement. This expression avoids |
| 510 | overflow if howto->bitsize is the number of bits in |
| 511 | bfd_vma. */ |
| 512 | reloc_bits = (((1 << (howto->bitsize - 1)) - 1) << 1) | 1; |
| 513 | |
| 514 | if (((bfd_vma) check & ~reloc_bits) != 0 |
| 515 | && (((bfd_vma) check & ~reloc_bits) |
| 516 | != (-(bfd_vma) 1 & ~reloc_bits))) |
| 517 | { |
| 518 | /* The above right shift is incorrect for a signed |
| 519 | value. See if turning on the upper bits fixes the |
| 520 | overflow. */ |
| 521 | if (howto->rightshift && (bfd_signed_vma) Rvalue < 0) |
| 522 | { |
| 523 | check |= ((bfd_vma) - 1 |
| 524 | & ~((bfd_vma) - 1 |
| 525 | >> howto->rightshift)); |
| 526 | if (((bfd_vma) check & ~reloc_bits) |
| 527 | != (-(bfd_vma) 1 & ~reloc_bits)) |
| 528 | return bfd_reloc_overflow; |
| 529 | } |
| 530 | else |
| 531 | return bfd_reloc_overflow; |
| 532 | } |
| 533 | |
| 534 | /* Drop unwanted bits from the value we are relocating to. */ |
| 535 | Rvalue >>= (bfd_vma) howto->rightshift; |
| 536 | |
| 537 | /* Apply dst_mask to select only relocatable part of the insn. */ |
| 538 | Rvalue &= howto->dst_mask; |
| 539 | |
| 540 | switch (howto->size) |
| 541 | { |
| 542 | case 0: |
| 543 | if (r_type == R_CRX_REL4) |
| 544 | { |
| 545 | Rvalue <<= 4; |
| 546 | Rvalue |= (bfd_get_8 (input_bfd, hit_data) & 0x0f); |
| 547 | } |
| 548 | |
| 549 | bfd_put_8 (input_bfd, (unsigned char) Rvalue, hit_data); |
| 550 | break; |
| 551 | |
| 552 | case 1: |
| 553 | if (r_type == R_CRX_REGREL12) |
| 554 | Rvalue |= (bfd_get_16 (input_bfd, hit_data) & 0xf000); |
| 555 | |
| 556 | bfd_put_16 (input_bfd, Rvalue, hit_data); |
| 557 | break; |
| 558 | |
| 559 | case 2: |
| 560 | if (r_type == R_CRX_REL24 |
| 561 | || r_type == R_CRX_REGREL22 |
| 562 | || r_type == R_CRX_REGREL28) |
| 563 | Rvalue |= (((bfd_get_16 (input_bfd, hit_data) << 16) | |
| 564 | bfd_get_16 (input_bfd, hit_data + 2)) & ~howto->dst_mask); |
| 565 | |
| 566 | if (r_type == R_CRX_NUM32 || r_type == R_CRX_SWITCH32) |
| 567 | /* Relocation on DATA is purely little-endian, that is, for a |
| 568 | multi-byte datum, the lowest address in memory contains the |
| 569 | little end of the datum, that is, the least significant byte. |
| 570 | Therefore we use BFD's byte Putting functions. */ |
| 571 | bfd_put_32 (input_bfd, Rvalue, hit_data); |
| 572 | else |
| 573 | /* Relocation on INSTRUCTIONS is different : Instructions are |
| 574 | word-addressable, that is, each word itself is arranged according |
| 575 | to little-endian convention, whereas the words are arranged with |
| 576 | respect to one another in BIG ENDIAN fashion. |
| 577 | When there is an immediate value that spans a word boundary, it is |
| 578 | split in a big-endian way with respect to the words. */ |
| 579 | { |
| 580 | bfd_put_16 (input_bfd, (Rvalue >> 16) & 0xffff, hit_data); |
| 581 | bfd_put_16 (input_bfd, Rvalue & 0xffff, hit_data + 2); |
| 582 | } |
| 583 | break; |
| 584 | |
| 585 | default: |
| 586 | return bfd_reloc_notsupported; |
| 587 | } |
| 588 | |
| 589 | return bfd_reloc_ok; |
| 590 | } |
| 591 | |
| 592 | /* Delete some bytes from a section while relaxing. */ |
| 593 | |
| 594 | static bfd_boolean |
| 595 | elf32_crx_relax_delete_bytes (struct bfd_link_info *link_info, bfd *abfd, |
| 596 | asection *sec, bfd_vma addr, int count) |
| 597 | { |
| 598 | Elf_Internal_Shdr *symtab_hdr; |
| 599 | unsigned int sec_shndx; |
| 600 | bfd_byte *contents; |
| 601 | Elf_Internal_Rela *irel, *irelend; |
| 602 | bfd_vma toaddr; |
| 603 | Elf_Internal_Sym *isym; |
| 604 | Elf_Internal_Sym *isymend; |
| 605 | struct elf_link_hash_entry **sym_hashes; |
| 606 | struct elf_link_hash_entry **end_hashes; |
| 607 | struct elf_link_hash_entry **start_hashes; |
| 608 | unsigned int symcount; |
| 609 | |
| 610 | sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); |
| 611 | |
| 612 | contents = elf_section_data (sec)->this_hdr.contents; |
| 613 | |
| 614 | toaddr = sec->size; |
| 615 | |
| 616 | irel = elf_section_data (sec)->relocs; |
| 617 | irelend = irel + sec->reloc_count; |
| 618 | |
| 619 | /* Actually delete the bytes. */ |
| 620 | memmove (contents + addr, contents + addr + count, |
| 621 | (size_t) (toaddr - addr - count)); |
| 622 | sec->size -= count; |
| 623 | |
| 624 | /* Adjust all the relocs. */ |
| 625 | for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++) |
| 626 | { |
| 627 | /* Get the new reloc address. */ |
| 628 | if ((irel->r_offset > addr |
| 629 | && irel->r_offset < toaddr)) |
| 630 | irel->r_offset -= count; |
| 631 | } |
| 632 | |
| 633 | /* Adjust the local symbols defined in this section. */ |
| 634 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 635 | isym = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 636 | for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++) |
| 637 | { |
| 638 | if (isym->st_shndx == sec_shndx |
| 639 | && isym->st_value > addr |
| 640 | && isym->st_value < toaddr) |
| 641 | { |
| 642 | /* Adjust the addend of SWITCH relocations in this section, |
| 643 | which reference this local symbol. */ |
| 644 | for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++) |
| 645 | { |
| 646 | unsigned long r_symndx; |
| 647 | Elf_Internal_Sym *rsym; |
| 648 | bfd_vma addsym, subsym; |
| 649 | |
| 650 | /* Skip if not a SWITCH relocation. */ |
| 651 | if (ELF32_R_TYPE (irel->r_info) != (int) R_CRX_SWITCH8 |
| 652 | && ELF32_R_TYPE (irel->r_info) != (int) R_CRX_SWITCH16 |
| 653 | && ELF32_R_TYPE (irel->r_info) != (int) R_CRX_SWITCH32) |
| 654 | continue; |
| 655 | |
| 656 | r_symndx = ELF32_R_SYM (irel->r_info); |
| 657 | rsym = (Elf_Internal_Sym *) symtab_hdr->contents + r_symndx; |
| 658 | |
| 659 | /* Skip if not the local adjusted symbol. */ |
| 660 | if (rsym != isym) |
| 661 | continue; |
| 662 | |
| 663 | addsym = isym->st_value; |
| 664 | subsym = addsym - irel->r_addend; |
| 665 | |
| 666 | /* Fix the addend only when -->> (addsym > addr >= subsym). */ |
| 667 | if (subsym <= addr) |
| 668 | irel->r_addend -= count; |
| 669 | else |
| 670 | continue; |
| 671 | } |
| 672 | |
| 673 | isym->st_value -= count; |
| 674 | } |
| 675 | } |
| 676 | |
| 677 | /* Now adjust the global symbols defined in this section. */ |
| 678 | symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) |
| 679 | - symtab_hdr->sh_info); |
| 680 | sym_hashes = start_hashes = elf_sym_hashes (abfd); |
| 681 | end_hashes = sym_hashes + symcount; |
| 682 | |
| 683 | for (; sym_hashes < end_hashes; sym_hashes++) |
| 684 | { |
| 685 | struct elf_link_hash_entry *sym_hash = *sym_hashes; |
| 686 | |
| 687 | /* The '--wrap SYMBOL' option is causing a pain when the object file, |
| 688 | containing the definition of __wrap_SYMBOL, includes a direct |
| 689 | call to SYMBOL as well. Since both __wrap_SYMBOL and SYMBOL reference |
| 690 | the same symbol (which is __wrap_SYMBOL), but still exist as two |
| 691 | different symbols in 'sym_hashes', we don't want to adjust |
| 692 | the global symbol __wrap_SYMBOL twice. |
| 693 | This check is only relevant when symbols are being wrapped. */ |
| 694 | if (link_info->wrap_hash != NULL) |
| 695 | { |
| 696 | struct elf_link_hash_entry **cur_sym_hashes; |
| 697 | |
| 698 | /* Loop only over the symbols whom been already checked. */ |
| 699 | for (cur_sym_hashes = start_hashes; cur_sym_hashes < sym_hashes; |
| 700 | cur_sym_hashes++) |
| 701 | { |
| 702 | /* If the current symbol is identical to 'sym_hash', that means |
| 703 | the symbol was already adjusted (or at least checked). */ |
| 704 | if (*cur_sym_hashes == sym_hash) |
| 705 | break; |
| 706 | } |
| 707 | /* Don't adjust the symbol again. */ |
| 708 | if (cur_sym_hashes < sym_hashes) |
| 709 | continue; |
| 710 | } |
| 711 | |
| 712 | if ((sym_hash->root.type == bfd_link_hash_defined |
| 713 | || sym_hash->root.type == bfd_link_hash_defweak) |
| 714 | && sym_hash->root.u.def.section == sec |
| 715 | && sym_hash->root.u.def.value > addr |
| 716 | && sym_hash->root.u.def.value < toaddr) |
| 717 | sym_hash->root.u.def.value -= count; |
| 718 | } |
| 719 | |
| 720 | return TRUE; |
| 721 | } |
| 722 | |
| 723 | /* This is a version of bfd_generic_get_relocated_section_contents |
| 724 | which uses elf32_crx_relocate_section. */ |
| 725 | |
| 726 | static bfd_byte * |
| 727 | elf32_crx_get_relocated_section_contents (bfd *output_bfd, |
| 728 | struct bfd_link_info *link_info, |
| 729 | struct bfd_link_order *link_order, |
| 730 | bfd_byte *data, |
| 731 | bfd_boolean relocatable, |
| 732 | asymbol **symbols) |
| 733 | { |
| 734 | Elf_Internal_Shdr *symtab_hdr; |
| 735 | asection *input_section = link_order->u.indirect.section; |
| 736 | bfd *input_bfd = input_section->owner; |
| 737 | asection **sections = NULL; |
| 738 | Elf_Internal_Rela *internal_relocs = NULL; |
| 739 | Elf_Internal_Sym *isymbuf = NULL; |
| 740 | |
| 741 | /* We only need to handle the case of relaxing, or of having a |
| 742 | particular set of section contents, specially. */ |
| 743 | if (relocatable |
| 744 | || elf_section_data (input_section)->this_hdr.contents == NULL) |
| 745 | return bfd_generic_get_relocated_section_contents (output_bfd, link_info, |
| 746 | link_order, data, |
| 747 | relocatable, |
| 748 | symbols); |
| 749 | |
| 750 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 751 | |
| 752 | memcpy (data, elf_section_data (input_section)->this_hdr.contents, |
| 753 | (size_t) input_section->size); |
| 754 | |
| 755 | if ((input_section->flags & SEC_RELOC) != 0 |
| 756 | && input_section->reloc_count > 0) |
| 757 | { |
| 758 | Elf_Internal_Sym *isym; |
| 759 | Elf_Internal_Sym *isymend; |
| 760 | asection **secpp; |
| 761 | bfd_size_type amt; |
| 762 | |
| 763 | internal_relocs = (_bfd_elf_link_read_relocs |
| 764 | (input_bfd, input_section, NULL, |
| 765 | (Elf_Internal_Rela *) NULL, FALSE)); |
| 766 | if (internal_relocs == NULL) |
| 767 | goto error_return; |
| 768 | |
| 769 | if (symtab_hdr->sh_info != 0) |
| 770 | { |
| 771 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 772 | if (isymbuf == NULL) |
| 773 | isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, |
| 774 | symtab_hdr->sh_info, 0, |
| 775 | NULL, NULL, NULL); |
| 776 | if (isymbuf == NULL) |
| 777 | goto error_return; |
| 778 | } |
| 779 | |
| 780 | amt = symtab_hdr->sh_info; |
| 781 | amt *= sizeof (asection *); |
| 782 | sections = bfd_malloc (amt); |
| 783 | if (sections == NULL && amt != 0) |
| 784 | goto error_return; |
| 785 | |
| 786 | isymend = isymbuf + symtab_hdr->sh_info; |
| 787 | for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp) |
| 788 | { |
| 789 | asection *isec; |
| 790 | |
| 791 | if (isym->st_shndx == SHN_UNDEF) |
| 792 | isec = bfd_und_section_ptr; |
| 793 | else if (isym->st_shndx == SHN_ABS) |
| 794 | isec = bfd_abs_section_ptr; |
| 795 | else if (isym->st_shndx == SHN_COMMON) |
| 796 | isec = bfd_com_section_ptr; |
| 797 | else |
| 798 | isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx); |
| 799 | |
| 800 | *secpp = isec; |
| 801 | } |
| 802 | |
| 803 | if (! elf32_crx_relocate_section (output_bfd, link_info, input_bfd, |
| 804 | input_section, data, internal_relocs, |
| 805 | isymbuf, sections)) |
| 806 | goto error_return; |
| 807 | |
| 808 | if (sections != NULL) |
| 809 | free (sections); |
| 810 | if (isymbuf != NULL |
| 811 | && symtab_hdr->contents != (unsigned char *) isymbuf) |
| 812 | free (isymbuf); |
| 813 | if (elf_section_data (input_section)->relocs != internal_relocs) |
| 814 | free (internal_relocs); |
| 815 | } |
| 816 | |
| 817 | return data; |
| 818 | |
| 819 | error_return: |
| 820 | if (sections != NULL) |
| 821 | free (sections); |
| 822 | if (isymbuf != NULL |
| 823 | && symtab_hdr->contents != (unsigned char *) isymbuf) |
| 824 | free (isymbuf); |
| 825 | if (internal_relocs != NULL |
| 826 | && elf_section_data (input_section)->relocs != internal_relocs) |
| 827 | free (internal_relocs); |
| 828 | return NULL; |
| 829 | } |
| 830 | |
| 831 | /* Relocate a CRX ELF section. */ |
| 832 | |
| 833 | static bfd_boolean |
| 834 | elf32_crx_relocate_section (bfd *output_bfd, struct bfd_link_info *info, |
| 835 | bfd *input_bfd, asection *input_section, |
| 836 | bfd_byte *contents, Elf_Internal_Rela *relocs, |
| 837 | Elf_Internal_Sym *local_syms, |
| 838 | asection **local_sections) |
| 839 | { |
| 840 | Elf_Internal_Shdr *symtab_hdr; |
| 841 | struct elf_link_hash_entry **sym_hashes; |
| 842 | Elf_Internal_Rela *rel, *relend; |
| 843 | |
| 844 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 845 | sym_hashes = elf_sym_hashes (input_bfd); |
| 846 | |
| 847 | rel = relocs; |
| 848 | relend = relocs + input_section->reloc_count; |
| 849 | for (; rel < relend; rel++) |
| 850 | { |
| 851 | int r_type; |
| 852 | reloc_howto_type *howto; |
| 853 | unsigned long r_symndx; |
| 854 | Elf_Internal_Sym *sym; |
| 855 | asection *sec; |
| 856 | struct elf_link_hash_entry *h; |
| 857 | bfd_vma relocation; |
| 858 | bfd_reloc_status_type r; |
| 859 | |
| 860 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 861 | r_type = ELF32_R_TYPE (rel->r_info); |
| 862 | howto = crx_elf_howto_table + (r_type); |
| 863 | |
| 864 | h = NULL; |
| 865 | sym = NULL; |
| 866 | sec = NULL; |
| 867 | if (r_symndx < symtab_hdr->sh_info) |
| 868 | { |
| 869 | sym = local_syms + r_symndx; |
| 870 | sec = local_sections[r_symndx]; |
| 871 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); |
| 872 | } |
| 873 | else |
| 874 | { |
| 875 | bfd_boolean unresolved_reloc, warned, ignored; |
| 876 | |
| 877 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
| 878 | r_symndx, symtab_hdr, sym_hashes, |
| 879 | h, sec, relocation, |
| 880 | unresolved_reloc, warned, ignored); |
| 881 | } |
| 882 | |
| 883 | if (sec != NULL && discarded_section (sec)) |
| 884 | RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, |
| 885 | rel, 1, relend, howto, 0, contents); |
| 886 | |
| 887 | if (bfd_link_relocatable (info)) |
| 888 | continue; |
| 889 | |
| 890 | r = crx_elf_final_link_relocate (howto, input_bfd, output_bfd, |
| 891 | input_section, |
| 892 | contents, rel->r_offset, |
| 893 | relocation, rel->r_addend, |
| 894 | info, sec, h == NULL); |
| 895 | |
| 896 | if (r != bfd_reloc_ok) |
| 897 | { |
| 898 | const char *name; |
| 899 | const char *msg = (const char *) 0; |
| 900 | |
| 901 | if (h != NULL) |
| 902 | name = h->root.root.string; |
| 903 | else |
| 904 | { |
| 905 | name = (bfd_elf_string_from_elf_section |
| 906 | (input_bfd, symtab_hdr->sh_link, sym->st_name)); |
| 907 | if (name == NULL || *name == '\0') |
| 908 | name = bfd_section_name (input_bfd, sec); |
| 909 | } |
| 910 | |
| 911 | switch (r) |
| 912 | { |
| 913 | case bfd_reloc_overflow: |
| 914 | (*info->callbacks->reloc_overflow) |
| 915 | (info, (h ? &h->root : NULL), name, howto->name, |
| 916 | (bfd_vma) 0, input_bfd, input_section, rel->r_offset); |
| 917 | break; |
| 918 | |
| 919 | case bfd_reloc_undefined: |
| 920 | (*info->callbacks->undefined_symbol) |
| 921 | (info, name, input_bfd, input_section, rel->r_offset, TRUE); |
| 922 | break; |
| 923 | |
| 924 | case bfd_reloc_outofrange: |
| 925 | msg = _("internal error: out of range error"); |
| 926 | goto common_error; |
| 927 | |
| 928 | case bfd_reloc_notsupported: |
| 929 | msg = _("internal error: unsupported relocation error"); |
| 930 | goto common_error; |
| 931 | |
| 932 | case bfd_reloc_dangerous: |
| 933 | msg = _("internal error: dangerous error"); |
| 934 | goto common_error; |
| 935 | |
| 936 | default: |
| 937 | msg = _("internal error: unknown error"); |
| 938 | /* Fall through. */ |
| 939 | |
| 940 | common_error: |
| 941 | (*info->callbacks->warning) (info, msg, name, input_bfd, |
| 942 | input_section, rel->r_offset); |
| 943 | break; |
| 944 | } |
| 945 | } |
| 946 | } |
| 947 | |
| 948 | return TRUE; |
| 949 | } |
| 950 | |
| 951 | /* This function handles relaxing for the CRX. |
| 952 | |
| 953 | There's quite a few relaxing opportunites available on the CRX: |
| 954 | |
| 955 | * bal/bcond:32 -> bal/bcond:16 2 bytes |
| 956 | * bcond:16 -> bcond:8 2 bytes |
| 957 | * cmpbcond:24 -> cmpbcond:8 2 bytes |
| 958 | * arithmetic imm32 -> arithmetic imm16 2 bytes |
| 959 | |
| 960 | Symbol- and reloc-reading infrastructure copied from elf-m10200.c. */ |
| 961 | |
| 962 | static bfd_boolean |
| 963 | elf32_crx_relax_section (bfd *abfd, asection *sec, |
| 964 | struct bfd_link_info *link_info, bfd_boolean *again) |
| 965 | { |
| 966 | Elf_Internal_Shdr *symtab_hdr; |
| 967 | Elf_Internal_Rela *internal_relocs; |
| 968 | Elf_Internal_Rela *irel, *irelend; |
| 969 | bfd_byte *contents = NULL; |
| 970 | Elf_Internal_Sym *isymbuf = NULL; |
| 971 | |
| 972 | /* Assume nothing changes. */ |
| 973 | *again = FALSE; |
| 974 | |
| 975 | /* We don't have to do anything for a relocatable link, if |
| 976 | this section does not have relocs, or if this is not a |
| 977 | code section. */ |
| 978 | if (bfd_link_relocatable (link_info) |
| 979 | || (sec->flags & SEC_RELOC) == 0 |
| 980 | || sec->reloc_count == 0 |
| 981 | || (sec->flags & SEC_CODE) == 0) |
| 982 | return TRUE; |
| 983 | |
| 984 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 985 | |
| 986 | /* Get a copy of the native relocations. */ |
| 987 | internal_relocs = (_bfd_elf_link_read_relocs |
| 988 | (abfd, sec, NULL, (Elf_Internal_Rela *) NULL, |
| 989 | link_info->keep_memory)); |
| 990 | if (internal_relocs == NULL) |
| 991 | goto error_return; |
| 992 | |
| 993 | /* Walk through them looking for relaxing opportunities. */ |
| 994 | irelend = internal_relocs + sec->reloc_count; |
| 995 | for (irel = internal_relocs; irel < irelend; irel++) |
| 996 | { |
| 997 | bfd_vma symval; |
| 998 | |
| 999 | /* If this isn't something that can be relaxed, then ignore |
| 1000 | this reloc. */ |
| 1001 | if (ELF32_R_TYPE (irel->r_info) != (int) R_CRX_REL32 |
| 1002 | && ELF32_R_TYPE (irel->r_info) != (int) R_CRX_REL16 |
| 1003 | && ELF32_R_TYPE (irel->r_info) != (int) R_CRX_REL24 |
| 1004 | && ELF32_R_TYPE (irel->r_info) != (int) R_CRX_IMM32) |
| 1005 | continue; |
| 1006 | |
| 1007 | /* Get the section contents if we haven't done so already. */ |
| 1008 | if (contents == NULL) |
| 1009 | { |
| 1010 | /* Get cached copy if it exists. */ |
| 1011 | if (elf_section_data (sec)->this_hdr.contents != NULL) |
| 1012 | contents = elf_section_data (sec)->this_hdr.contents; |
| 1013 | /* Go get them off disk. */ |
| 1014 | else if (!bfd_malloc_and_get_section (abfd, sec, &contents)) |
| 1015 | goto error_return; |
| 1016 | } |
| 1017 | |
| 1018 | /* Read this BFD's local symbols if we haven't done so already. */ |
| 1019 | if (isymbuf == NULL && symtab_hdr->sh_info != 0) |
| 1020 | { |
| 1021 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 1022 | if (isymbuf == NULL) |
| 1023 | isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, |
| 1024 | symtab_hdr->sh_info, 0, |
| 1025 | NULL, NULL, NULL); |
| 1026 | if (isymbuf == NULL) |
| 1027 | goto error_return; |
| 1028 | } |
| 1029 | |
| 1030 | /* Get the value of the symbol referred to by the reloc. */ |
| 1031 | if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) |
| 1032 | { |
| 1033 | /* A local symbol. */ |
| 1034 | Elf_Internal_Sym *isym; |
| 1035 | asection *sym_sec; |
| 1036 | |
| 1037 | isym = isymbuf + ELF32_R_SYM (irel->r_info); |
| 1038 | if (isym->st_shndx == SHN_UNDEF) |
| 1039 | sym_sec = bfd_und_section_ptr; |
| 1040 | else if (isym->st_shndx == SHN_ABS) |
| 1041 | sym_sec = bfd_abs_section_ptr; |
| 1042 | else if (isym->st_shndx == SHN_COMMON) |
| 1043 | sym_sec = bfd_com_section_ptr; |
| 1044 | else |
| 1045 | sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| 1046 | symval = (isym->st_value |
| 1047 | + sym_sec->output_section->vma |
| 1048 | + sym_sec->output_offset); |
| 1049 | } |
| 1050 | else |
| 1051 | { |
| 1052 | unsigned long indx; |
| 1053 | struct elf_link_hash_entry *h; |
| 1054 | |
| 1055 | /* An external symbol. */ |
| 1056 | indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; |
| 1057 | h = elf_sym_hashes (abfd)[indx]; |
| 1058 | BFD_ASSERT (h != NULL); |
| 1059 | |
| 1060 | if (h->root.type != bfd_link_hash_defined |
| 1061 | && h->root.type != bfd_link_hash_defweak) |
| 1062 | /* This appears to be a reference to an undefined |
| 1063 | symbol. Just ignore it--it will be caught by the |
| 1064 | regular reloc processing. */ |
| 1065 | continue; |
| 1066 | |
| 1067 | symval = (h->root.u.def.value |
| 1068 | + h->root.u.def.section->output_section->vma |
| 1069 | + h->root.u.def.section->output_offset); |
| 1070 | } |
| 1071 | |
| 1072 | /* For simplicity of coding, we are going to modify the section |
| 1073 | contents, the section relocs, and the BFD symbol table. We |
| 1074 | must tell the rest of the code not to free up this |
| 1075 | information. It would be possible to instead create a table |
| 1076 | of changes which have to be made, as is done in coff-mips.c; |
| 1077 | that would be more work, but would require less memory when |
| 1078 | the linker is run. */ |
| 1079 | |
| 1080 | /* Try to turn a 32bit pc-relative branch/call into |
| 1081 | a 16bit pc-relative branch/call. */ |
| 1082 | if (ELF32_R_TYPE (irel->r_info) == (int) R_CRX_REL32) |
| 1083 | { |
| 1084 | bfd_vma value = symval; |
| 1085 | |
| 1086 | /* Deal with pc-relative gunk. */ |
| 1087 | value -= (sec->output_section->vma + sec->output_offset); |
| 1088 | value -= irel->r_offset; |
| 1089 | value += irel->r_addend; |
| 1090 | |
| 1091 | /* See if the value will fit in 16 bits, note the high value is |
| 1092 | 0xfffe + 2 as the target will be two bytes closer if we are |
| 1093 | able to relax. */ |
| 1094 | if ((long) value < 0x10000 && (long) value > -0x10002) |
| 1095 | { |
| 1096 | unsigned short code; |
| 1097 | |
| 1098 | /* Get the opcode. */ |
| 1099 | code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset); |
| 1100 | |
| 1101 | /* Verify it's a 'bal'/'bcond' and fix the opcode. */ |
| 1102 | if ((code & 0xfff0) == 0x3170) |
| 1103 | bfd_put_8 (abfd, 0x30, contents + irel->r_offset + 1); |
| 1104 | else if ((code & 0xf0ff) == 0x707f) |
| 1105 | bfd_put_8 (abfd, 0x7e, contents + irel->r_offset); |
| 1106 | else |
| 1107 | continue; |
| 1108 | |
| 1109 | /* Note that we've changed the relocs, section contents, etc. */ |
| 1110 | elf_section_data (sec)->relocs = internal_relocs; |
| 1111 | elf_section_data (sec)->this_hdr.contents = contents; |
| 1112 | symtab_hdr->contents = (unsigned char *) isymbuf; |
| 1113 | |
| 1114 | /* Fix the relocation's type. */ |
| 1115 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| 1116 | R_CRX_REL16); |
| 1117 | |
| 1118 | /* Delete two bytes of data. */ |
| 1119 | if (!elf32_crx_relax_delete_bytes (link_info, abfd, sec, |
| 1120 | irel->r_offset + 2, 2)) |
| 1121 | goto error_return; |
| 1122 | |
| 1123 | /* That will change things, so, we should relax again. |
| 1124 | Note that this is not required, and it may be slow. */ |
| 1125 | *again = TRUE; |
| 1126 | } |
| 1127 | } |
| 1128 | |
| 1129 | /* Try to turn a 16bit pc-relative branch into an |
| 1130 | 8bit pc-relative branch. */ |
| 1131 | if (ELF32_R_TYPE (irel->r_info) == (int) R_CRX_REL16) |
| 1132 | { |
| 1133 | bfd_vma value = symval; |
| 1134 | |
| 1135 | /* Deal with pc-relative gunk. */ |
| 1136 | value -= (sec->output_section->vma + sec->output_offset); |
| 1137 | value -= irel->r_offset; |
| 1138 | value += irel->r_addend; |
| 1139 | |
| 1140 | /* See if the value will fit in 8 bits, note the high value is |
| 1141 | 0xfc + 2 as the target will be two bytes closer if we are |
| 1142 | able to relax. */ |
| 1143 | if ((long) value < 0xfe && (long) value > -0x100) |
| 1144 | { |
| 1145 | unsigned short code; |
| 1146 | |
| 1147 | /* Get the opcode. */ |
| 1148 | code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset); |
| 1149 | |
| 1150 | /* Verify it's a 'bcond' opcode. */ |
| 1151 | if ((code & 0xf0ff) != 0x707e) |
| 1152 | continue; |
| 1153 | |
| 1154 | /* Note that we've changed the relocs, section contents, etc. */ |
| 1155 | elf_section_data (sec)->relocs = internal_relocs; |
| 1156 | elf_section_data (sec)->this_hdr.contents = contents; |
| 1157 | symtab_hdr->contents = (unsigned char *) isymbuf; |
| 1158 | |
| 1159 | /* Fix the relocation's type. */ |
| 1160 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| 1161 | R_CRX_REL8); |
| 1162 | |
| 1163 | /* Delete two bytes of data. */ |
| 1164 | if (!elf32_crx_relax_delete_bytes (link_info, abfd, sec, |
| 1165 | irel->r_offset + 2, 2)) |
| 1166 | goto error_return; |
| 1167 | |
| 1168 | /* That will change things, so, we should relax again. |
| 1169 | Note that this is not required, and it may be slow. */ |
| 1170 | *again = TRUE; |
| 1171 | } |
| 1172 | } |
| 1173 | |
| 1174 | /* Try to turn a 24bit pc-relative cmp&branch into |
| 1175 | an 8bit pc-relative cmp&branch. */ |
| 1176 | if (ELF32_R_TYPE (irel->r_info) == (int) R_CRX_REL24) |
| 1177 | { |
| 1178 | bfd_vma value = symval; |
| 1179 | |
| 1180 | /* Deal with pc-relative gunk. */ |
| 1181 | value -= (sec->output_section->vma + sec->output_offset); |
| 1182 | value -= irel->r_offset; |
| 1183 | value += irel->r_addend; |
| 1184 | |
| 1185 | /* See if the value will fit in 8 bits, note the high value is |
| 1186 | 0x7e + 2 as the target will be two bytes closer if we are |
| 1187 | able to relax. */ |
| 1188 | if ((long) value < 0x100 && (long) value > -0x100) |
| 1189 | { |
| 1190 | unsigned short code; |
| 1191 | |
| 1192 | /* Get the opcode. */ |
| 1193 | code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset); |
| 1194 | |
| 1195 | /* Verify it's a 'cmp&branch' opcode. */ |
| 1196 | if ((code & 0xfff0) != 0x3180 && (code & 0xfff0) != 0x3190 |
| 1197 | && (code & 0xfff0) != 0x31a0 && (code & 0xfff0) != 0x31c0 |
| 1198 | && (code & 0xfff0) != 0x31d0 && (code & 0xfff0) != 0x31e0 |
| 1199 | /* Or a Co-processor branch ('bcop'). */ |
| 1200 | && (code & 0xfff0) != 0x3010 && (code & 0xfff0) != 0x3110) |
| 1201 | continue; |
| 1202 | |
| 1203 | /* Note that we've changed the relocs, section contents, etc. */ |
| 1204 | elf_section_data (sec)->relocs = internal_relocs; |
| 1205 | elf_section_data (sec)->this_hdr.contents = contents; |
| 1206 | symtab_hdr->contents = (unsigned char *) isymbuf; |
| 1207 | |
| 1208 | /* Fix the opcode. */ |
| 1209 | bfd_put_8 (abfd, 0x30, contents + irel->r_offset + 1); |
| 1210 | |
| 1211 | /* Fix the relocation's type. */ |
| 1212 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| 1213 | R_CRX_REL8_CMP); |
| 1214 | |
| 1215 | /* Delete two bytes of data. */ |
| 1216 | if (!elf32_crx_relax_delete_bytes (link_info, abfd, sec, |
| 1217 | irel->r_offset + 4, 2)) |
| 1218 | goto error_return; |
| 1219 | |
| 1220 | /* That will change things, so, we should relax again. |
| 1221 | Note that this is not required, and it may be slow. */ |
| 1222 | *again = TRUE; |
| 1223 | } |
| 1224 | } |
| 1225 | |
| 1226 | /* Try to turn a 32bit immediate address into |
| 1227 | a 16bit immediate address. */ |
| 1228 | if (ELF32_R_TYPE (irel->r_info) == (int) R_CRX_IMM32) |
| 1229 | { |
| 1230 | bfd_vma value = symval; |
| 1231 | |
| 1232 | /* See if the value will fit in 16 bits. */ |
| 1233 | if ((long) value < 0x7fff && (long) value > -0x8000) |
| 1234 | { |
| 1235 | unsigned short code; |
| 1236 | |
| 1237 | /* Get the opcode. */ |
| 1238 | code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset); |
| 1239 | |
| 1240 | /* Verify it's a 'arithmetic double'. */ |
| 1241 | if ((code & 0xf0f0) != 0x20f0) |
| 1242 | continue; |
| 1243 | |
| 1244 | /* Note that we've changed the relocs, section contents, etc. */ |
| 1245 | elf_section_data (sec)->relocs = internal_relocs; |
| 1246 | elf_section_data (sec)->this_hdr.contents = contents; |
| 1247 | symtab_hdr->contents = (unsigned char *) isymbuf; |
| 1248 | |
| 1249 | /* Fix the opcode. */ |
| 1250 | bfd_put_8 (abfd, (code & 0xff) - 0x10, contents + irel->r_offset); |
| 1251 | |
| 1252 | /* Fix the relocation's type. */ |
| 1253 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| 1254 | R_CRX_IMM16); |
| 1255 | |
| 1256 | /* Delete two bytes of data. */ |
| 1257 | if (!elf32_crx_relax_delete_bytes (link_info, abfd, sec, |
| 1258 | irel->r_offset + 2, 2)) |
| 1259 | goto error_return; |
| 1260 | |
| 1261 | /* That will change things, so, we should relax again. |
| 1262 | Note that this is not required, and it may be slow. */ |
| 1263 | *again = TRUE; |
| 1264 | } |
| 1265 | } |
| 1266 | } |
| 1267 | |
| 1268 | if (isymbuf != NULL |
| 1269 | && symtab_hdr->contents != (unsigned char *) isymbuf) |
| 1270 | { |
| 1271 | if (! link_info->keep_memory) |
| 1272 | free (isymbuf); |
| 1273 | else |
| 1274 | { |
| 1275 | /* Cache the symbols for elf_link_input_bfd. */ |
| 1276 | symtab_hdr->contents = (unsigned char *) isymbuf; |
| 1277 | } |
| 1278 | } |
| 1279 | |
| 1280 | if (contents != NULL |
| 1281 | && elf_section_data (sec)->this_hdr.contents != contents) |
| 1282 | { |
| 1283 | if (! link_info->keep_memory) |
| 1284 | free (contents); |
| 1285 | else |
| 1286 | { |
| 1287 | /* Cache the section contents for elf_link_input_bfd. */ |
| 1288 | elf_section_data (sec)->this_hdr.contents = contents; |
| 1289 | } |
| 1290 | } |
| 1291 | |
| 1292 | if (internal_relocs != NULL |
| 1293 | && elf_section_data (sec)->relocs != internal_relocs) |
| 1294 | free (internal_relocs); |
| 1295 | |
| 1296 | return TRUE; |
| 1297 | |
| 1298 | error_return: |
| 1299 | if (isymbuf != NULL |
| 1300 | && symtab_hdr->contents != (unsigned char *) isymbuf) |
| 1301 | free (isymbuf); |
| 1302 | if (contents != NULL |
| 1303 | && elf_section_data (sec)->this_hdr.contents != contents) |
| 1304 | free (contents); |
| 1305 | if (internal_relocs != NULL |
| 1306 | && elf_section_data (sec)->relocs != internal_relocs) |
| 1307 | free (internal_relocs); |
| 1308 | |
| 1309 | return FALSE; |
| 1310 | } |
| 1311 | |
| 1312 | /* Definitions for setting CRX target vector. */ |
| 1313 | #define TARGET_LITTLE_SYM crx_elf32_vec |
| 1314 | #define TARGET_LITTLE_NAME "elf32-crx" |
| 1315 | #define ELF_ARCH bfd_arch_crx |
| 1316 | #define ELF_MACHINE_CODE EM_CRX |
| 1317 | #define ELF_MAXPAGESIZE 0x1 |
| 1318 | #define elf_symbol_leading_char '_' |
| 1319 | |
| 1320 | #define bfd_elf32_bfd_reloc_type_lookup elf_crx_reloc_type_lookup |
| 1321 | #define bfd_elf32_bfd_reloc_name_lookup \ |
| 1322 | elf_crx_reloc_name_lookup |
| 1323 | #define elf_info_to_howto elf_crx_info_to_howto |
| 1324 | #define elf_info_to_howto_rel NULL |
| 1325 | #define elf_backend_relocate_section elf32_crx_relocate_section |
| 1326 | #define bfd_elf32_bfd_relax_section elf32_crx_relax_section |
| 1327 | #define bfd_elf32_bfd_get_relocated_section_contents \ |
| 1328 | elf32_crx_get_relocated_section_contents |
| 1329 | #define elf_backend_can_gc_sections 1 |
| 1330 | #define elf_backend_rela_normal 1 |
| 1331 | |
| 1332 | #include "elf32-target.h" |