| 1 | /* 32-bit ELF support for TI PRU. |
| 2 | Copyright (C) 2014-2018 Free Software Foundation, Inc. |
| 3 | Contributed by Dimitar Dimitrov <dimitar@dinux.eu> |
| 4 | Based on elf32-nios2.c |
| 5 | |
| 6 | This file is part of BFD, the Binary File Descriptor library. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 21 | MA 02110-1301, USA. */ |
| 22 | |
| 23 | /* This file handles TI PRU ELF targets. */ |
| 24 | |
| 25 | #include "sysdep.h" |
| 26 | #include "bfd.h" |
| 27 | #include "libbfd.h" |
| 28 | #include "bfdlink.h" |
| 29 | #include "genlink.h" |
| 30 | #include "elf-bfd.h" |
| 31 | #include "elf/pru.h" |
| 32 | #include "opcode/pru.h" |
| 33 | |
| 34 | #define SWAP_VALS(A,B) \ |
| 35 | do { \ |
| 36 | (A) ^= (B); \ |
| 37 | (B) ^= (A); \ |
| 38 | (A) ^= (B); \ |
| 39 | } while (0) |
| 40 | |
| 41 | /* Enable debugging printout at stdout with this variable. */ |
| 42 | static bfd_boolean debug_relax = FALSE; |
| 43 | |
| 44 | /* Forward declarations. */ |
| 45 | static bfd_reloc_status_type pru_elf32_pmem_relocate |
| 46 | (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); |
| 47 | static bfd_reloc_status_type pru_elf32_s10_pcrel_relocate |
| 48 | (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); |
| 49 | static bfd_reloc_status_type pru_elf32_u8_pcrel_relocate |
| 50 | (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); |
| 51 | static bfd_reloc_status_type pru_elf32_ldi32_relocate |
| 52 | (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); |
| 53 | static bfd_reloc_status_type bfd_elf_pru_diff_relocate |
| 54 | (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); |
| 55 | |
| 56 | /* Target vector. */ |
| 57 | extern const bfd_target pru_elf32_vec; |
| 58 | |
| 59 | /* The relocation table used for SHT_REL sections. */ |
| 60 | static reloc_howto_type elf_pru_howto_table_rel[] = { |
| 61 | /* No relocation. */ |
| 62 | HOWTO (R_PRU_NONE, /* type */ |
| 63 | 0, /* rightshift */ |
| 64 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 65 | 3, /* bitsize */ |
| 66 | FALSE, /* pc_relative */ |
| 67 | 0, /* bitpos */ |
| 68 | complain_overflow_dont,/* complain_on_overflow */ |
| 69 | bfd_elf_generic_reloc, /* special_function */ |
| 70 | "R_PRU_NONE", /* name */ |
| 71 | FALSE, /* partial_inplace */ |
| 72 | 0, /* src_mask */ |
| 73 | 0, /* dst_mask */ |
| 74 | FALSE), /* pcrel_offset */ |
| 75 | |
| 76 | HOWTO (R_PRU_16_PMEM, |
| 77 | 2, |
| 78 | 1, /* short */ |
| 79 | 32, |
| 80 | FALSE, |
| 81 | 0, |
| 82 | complain_overflow_dont, |
| 83 | bfd_elf_generic_reloc, |
| 84 | "R_PRU_16_PMEM", |
| 85 | FALSE, |
| 86 | 0, /* src_mask */ |
| 87 | 0xffff, |
| 88 | FALSE), |
| 89 | |
| 90 | HOWTO (R_PRU_U16_PMEMIMM, |
| 91 | 2, |
| 92 | 2, |
| 93 | 32, |
| 94 | FALSE, |
| 95 | 8, |
| 96 | complain_overflow_unsigned, |
| 97 | pru_elf32_pmem_relocate, |
| 98 | "R_PRU_U16_PMEMIMM", |
| 99 | FALSE, |
| 100 | 0, /* src_mask */ |
| 101 | 0x00ffff00, |
| 102 | FALSE), |
| 103 | |
| 104 | HOWTO (R_PRU_BFD_RELOC_16, |
| 105 | 0, |
| 106 | 1, /* short */ |
| 107 | 16, |
| 108 | FALSE, |
| 109 | 0, |
| 110 | complain_overflow_bitfield, |
| 111 | bfd_elf_generic_reloc, |
| 112 | "R_PRU_BFD_RELOC16", |
| 113 | FALSE, |
| 114 | 0, /* src_mask */ |
| 115 | 0x0000ffff, |
| 116 | FALSE), |
| 117 | |
| 118 | /* 16-bit unsigned immediate relocation. */ |
| 119 | HOWTO (R_PRU_U16, /* type */ |
| 120 | 0, /* rightshift */ |
| 121 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 122 | 16, /* bitsize */ |
| 123 | FALSE, /* pc_relative */ |
| 124 | 8, /* bitpos */ |
| 125 | complain_overflow_unsigned, /* complain on overflow */ |
| 126 | bfd_elf_generic_reloc, /* special function */ |
| 127 | "R_PRU_U16", /* name */ |
| 128 | FALSE, /* partial_inplace */ |
| 129 | 0, /* src_mask */ |
| 130 | 0x00ffff00, /* dest_mask */ |
| 131 | FALSE), /* pcrel_offset */ |
| 132 | |
| 133 | HOWTO (R_PRU_32_PMEM, |
| 134 | 2, |
| 135 | 2, /* long */ |
| 136 | 32, |
| 137 | FALSE, |
| 138 | 0, |
| 139 | complain_overflow_dont, |
| 140 | pru_elf32_pmem_relocate, |
| 141 | "R_PRU_32_PMEM", |
| 142 | FALSE, |
| 143 | 0, /* src_mask */ |
| 144 | 0xffffffff, |
| 145 | FALSE), |
| 146 | |
| 147 | HOWTO (R_PRU_BFD_RELOC_32, |
| 148 | 0, |
| 149 | 2, /* long */ |
| 150 | 32, |
| 151 | FALSE, |
| 152 | 0, |
| 153 | complain_overflow_dont, |
| 154 | bfd_elf_generic_reloc, |
| 155 | "R_PRU_BFD_RELOC32", |
| 156 | FALSE, |
| 157 | 0, /* src_mask */ |
| 158 | 0xffffffff, |
| 159 | FALSE), |
| 160 | |
| 161 | HOWTO (R_PRU_S10_PCREL, |
| 162 | 2, |
| 163 | 2, |
| 164 | 10, |
| 165 | TRUE, |
| 166 | 0, |
| 167 | complain_overflow_bitfield, |
| 168 | pru_elf32_s10_pcrel_relocate, |
| 169 | "R_PRU_S10_PCREL", |
| 170 | FALSE, |
| 171 | 0, /* src_mask */ |
| 172 | 0x060000ff, |
| 173 | TRUE), |
| 174 | |
| 175 | HOWTO (R_PRU_U8_PCREL, |
| 176 | 2, |
| 177 | 2, |
| 178 | 8, |
| 179 | TRUE, |
| 180 | 0, |
| 181 | complain_overflow_unsigned, |
| 182 | pru_elf32_u8_pcrel_relocate, |
| 183 | "R_PRU_U8_PCREL", |
| 184 | FALSE, |
| 185 | 0, /* src_mask */ |
| 186 | 0x000000ff, |
| 187 | TRUE), |
| 188 | |
| 189 | HOWTO (R_PRU_LDI32, |
| 190 | 0, /* rightshift */ |
| 191 | 4, /* size (4 = 8bytes) */ |
| 192 | 32, /* bitsize */ |
| 193 | FALSE, /* pc_relative */ |
| 194 | 0, /* bitpos */ |
| 195 | complain_overflow_unsigned, /* complain on overflow */ |
| 196 | pru_elf32_ldi32_relocate, /* special function */ |
| 197 | "R_PRU_LDI32", /* name */ |
| 198 | FALSE, /* partial_inplace */ |
| 199 | 0, /* src_mask */ |
| 200 | 0xffffffff, /* dest_mask */ |
| 201 | FALSE), /* pcrel_offset */ |
| 202 | |
| 203 | /* GNU-specific relocations. */ |
| 204 | HOWTO (R_PRU_GNU_BFD_RELOC_8, |
| 205 | 0, |
| 206 | 0, /* byte */ |
| 207 | 8, |
| 208 | FALSE, |
| 209 | 0, |
| 210 | complain_overflow_bitfield, |
| 211 | bfd_elf_generic_reloc, |
| 212 | "R_PRU_BFD_RELOC8", |
| 213 | FALSE, |
| 214 | 0, /* src_mask */ |
| 215 | 0x000000ff, |
| 216 | FALSE), |
| 217 | |
| 218 | HOWTO (R_PRU_GNU_DIFF8, /* type */ |
| 219 | 0, /* rightshift */ |
| 220 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 221 | 8, /* bitsize */ |
| 222 | FALSE, /* pc_relative */ |
| 223 | 0, /* bitpos */ |
| 224 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 225 | bfd_elf_pru_diff_relocate, /* special_function */ |
| 226 | "R_PRU_DIFF8", /* name */ |
| 227 | FALSE, /* partial_inplace */ |
| 228 | 0, /* src_mask */ |
| 229 | 0xff, /* dst_mask */ |
| 230 | FALSE), /* pcrel_offset */ |
| 231 | |
| 232 | HOWTO (R_PRU_GNU_DIFF16, /* type */ |
| 233 | 0, /* rightshift */ |
| 234 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 235 | 16, /* bitsize */ |
| 236 | FALSE, /* pc_relative */ |
| 237 | 0, /* bitpos */ |
| 238 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 239 | bfd_elf_pru_diff_relocate,/* special_function */ |
| 240 | "R_PRU_DIFF16", /* name */ |
| 241 | FALSE, /* partial_inplace */ |
| 242 | 0, /* src_mask */ |
| 243 | 0xffff, /* dst_mask */ |
| 244 | FALSE), /* pcrel_offset */ |
| 245 | |
| 246 | HOWTO (R_PRU_GNU_DIFF32, /* type */ |
| 247 | 0, /* rightshift */ |
| 248 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 249 | 32, /* bitsize */ |
| 250 | FALSE, /* pc_relative */ |
| 251 | 0, /* bitpos */ |
| 252 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 253 | bfd_elf_pru_diff_relocate,/* special_function */ |
| 254 | "R_PRU_DIFF32", /* name */ |
| 255 | FALSE, /* partial_inplace */ |
| 256 | 0, /* src_mask */ |
| 257 | 0xffffffff, /* dst_mask */ |
| 258 | FALSE), /* pcrel_offset */ |
| 259 | |
| 260 | HOWTO (R_PRU_GNU_DIFF16_PMEM, /* type */ |
| 261 | 0, /* rightshift */ |
| 262 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 263 | 16, /* bitsize */ |
| 264 | FALSE, /* pc_relative */ |
| 265 | 0, /* bitpos */ |
| 266 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 267 | bfd_elf_pru_diff_relocate,/* special_function */ |
| 268 | "R_PRU_DIFF16_PMEM", /* name */ |
| 269 | FALSE, /* partial_inplace */ |
| 270 | 0, /* src_mask */ |
| 271 | 0xffff, /* dst_mask */ |
| 272 | FALSE), /* pcrel_offset */ |
| 273 | |
| 274 | HOWTO (R_PRU_GNU_DIFF32_PMEM, /* type */ |
| 275 | 0, /* rightshift */ |
| 276 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 277 | 32, /* bitsize */ |
| 278 | FALSE, /* pc_relative */ |
| 279 | 0, /* bitpos */ |
| 280 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 281 | bfd_elf_pru_diff_relocate,/* special_function */ |
| 282 | "R_PRU_DIFF32_PMEM", /* name */ |
| 283 | FALSE, /* partial_inplace */ |
| 284 | 0, /* src_mask */ |
| 285 | 0xffffffff, /* dst_mask */ |
| 286 | FALSE), /* pcrel_offset */ |
| 287 | |
| 288 | /* Add other relocations here. */ |
| 289 | }; |
| 290 | |
| 291 | static unsigned char elf_code_to_howto_index[R_PRU_ILLEGAL + 1]; |
| 292 | |
| 293 | /* Return the howto for relocation RTYPE. */ |
| 294 | static reloc_howto_type * |
| 295 | lookup_howto (unsigned int rtype) |
| 296 | { |
| 297 | static int initialized = 0; |
| 298 | int i; |
| 299 | int howto_tbl_size = (int) (sizeof (elf_pru_howto_table_rel) |
| 300 | / sizeof (elf_pru_howto_table_rel[0])); |
| 301 | |
| 302 | if (!initialized) |
| 303 | { |
| 304 | initialized = 1; |
| 305 | memset (elf_code_to_howto_index, 0xff, |
| 306 | sizeof (elf_code_to_howto_index)); |
| 307 | for (i = 0; i < howto_tbl_size; i++) |
| 308 | elf_code_to_howto_index[elf_pru_howto_table_rel[i].type] = i; |
| 309 | } |
| 310 | |
| 311 | BFD_ASSERT (rtype <= R_PRU_ILLEGAL); |
| 312 | i = elf_code_to_howto_index[rtype]; |
| 313 | if (i >= howto_tbl_size) |
| 314 | return 0; |
| 315 | return elf_pru_howto_table_rel + i; |
| 316 | } |
| 317 | |
| 318 | /* Map for converting BFD reloc types to PRU reloc types. */ |
| 319 | struct elf_reloc_map |
| 320 | { |
| 321 | bfd_reloc_code_real_type bfd_val; |
| 322 | enum elf_pru_reloc_type elf_val; |
| 323 | }; |
| 324 | |
| 325 | static const struct elf_reloc_map pru_reloc_map[] = { |
| 326 | {BFD_RELOC_NONE, R_PRU_NONE}, |
| 327 | {BFD_RELOC_PRU_16_PMEM, R_PRU_16_PMEM}, |
| 328 | {BFD_RELOC_PRU_U16_PMEMIMM, R_PRU_U16_PMEMIMM}, |
| 329 | {BFD_RELOC_16, R_PRU_BFD_RELOC_16}, |
| 330 | {BFD_RELOC_PRU_U16, R_PRU_U16}, |
| 331 | {BFD_RELOC_PRU_32_PMEM, R_PRU_32_PMEM}, |
| 332 | {BFD_RELOC_32, R_PRU_BFD_RELOC_32}, |
| 333 | {BFD_RELOC_PRU_S10_PCREL, R_PRU_S10_PCREL}, |
| 334 | {BFD_RELOC_PRU_U8_PCREL, R_PRU_U8_PCREL}, |
| 335 | {BFD_RELOC_PRU_LDI32, R_PRU_LDI32}, |
| 336 | |
| 337 | {BFD_RELOC_8, R_PRU_GNU_BFD_RELOC_8}, |
| 338 | {BFD_RELOC_PRU_GNU_DIFF8, R_PRU_GNU_DIFF8}, |
| 339 | {BFD_RELOC_PRU_GNU_DIFF16, R_PRU_GNU_DIFF16}, |
| 340 | {BFD_RELOC_PRU_GNU_DIFF32, R_PRU_GNU_DIFF32}, |
| 341 | {BFD_RELOC_PRU_GNU_DIFF16_PMEM, R_PRU_GNU_DIFF16_PMEM}, |
| 342 | {BFD_RELOC_PRU_GNU_DIFF32_PMEM, R_PRU_GNU_DIFF32_PMEM}, |
| 343 | }; |
| 344 | |
| 345 | |
| 346 | /* Assorted hash table functions. */ |
| 347 | |
| 348 | /* Create an entry in a PRU ELF linker hash table. */ |
| 349 | static struct bfd_hash_entry * |
| 350 | link_hash_newfunc (struct bfd_hash_entry *entry, |
| 351 | struct bfd_hash_table *table, const char *string) |
| 352 | { |
| 353 | /* Allocate the structure if it has not already been allocated by a |
| 354 | subclass. */ |
| 355 | if (entry == NULL) |
| 356 | { |
| 357 | entry = bfd_hash_allocate (table, |
| 358 | sizeof (struct elf_link_hash_entry)); |
| 359 | if (entry == NULL) |
| 360 | return entry; |
| 361 | } |
| 362 | |
| 363 | /* Call the allocation method of the superclass. */ |
| 364 | entry = _bfd_elf_link_hash_newfunc (entry, table, string); |
| 365 | |
| 366 | return entry; |
| 367 | } |
| 368 | |
| 369 | /* Implement bfd_elf32_bfd_reloc_type_lookup: |
| 370 | Given a BFD reloc type, return a howto structure. */ |
| 371 | static reloc_howto_type * |
| 372 | pru_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 373 | bfd_reloc_code_real_type code) |
| 374 | { |
| 375 | int i; |
| 376 | for (i = 0; |
| 377 | i < (int) (sizeof (pru_reloc_map) / sizeof (struct elf_reloc_map)); |
| 378 | ++i) |
| 379 | if (pru_reloc_map[i].bfd_val == code) |
| 380 | return lookup_howto ((unsigned int) pru_reloc_map[i].elf_val); |
| 381 | return NULL; |
| 382 | } |
| 383 | |
| 384 | /* Implement bfd_elf32_bfd_reloc_name_lookup: |
| 385 | Given a reloc name, return a howto structure. */ |
| 386 | static reloc_howto_type * |
| 387 | pru_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 388 | const char *r_name) |
| 389 | { |
| 390 | unsigned int i; |
| 391 | for (i = 0; |
| 392 | i < (sizeof (elf_pru_howto_table_rel) |
| 393 | / sizeof (elf_pru_howto_table_rel[0])); |
| 394 | i++) |
| 395 | if (elf_pru_howto_table_rel[i].name |
| 396 | && strcasecmp (elf_pru_howto_table_rel[i].name, r_name) == 0) |
| 397 | return &elf_pru_howto_table_rel[i]; |
| 398 | |
| 399 | return NULL; |
| 400 | } |
| 401 | |
| 402 | /* Implement elf_info_to_howto: |
| 403 | Given a ELF32 relocation, fill in a arelent structure. */ |
| 404 | static void |
| 405 | pru_elf32_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr, |
| 406 | Elf_Internal_Rela *dst) |
| 407 | { |
| 408 | unsigned int r_type; |
| 409 | |
| 410 | r_type = ELF32_R_TYPE (dst->r_info); |
| 411 | BFD_ASSERT (r_type < R_PRU_ILLEGAL); |
| 412 | cache_ptr->howto = lookup_howto (r_type); |
| 413 | } |
| 414 | |
| 415 | /* Do the relocations that require special handling. */ |
| 416 | /* Produce a word address for program memory. Linker scripts will put .text |
| 417 | at a high offset in order to differentiate it from .data. So here we also |
| 418 | mask the high bits of PMEM address. |
| 419 | |
| 420 | But why 1MB when internal Program Memory much smaller? We want to catch |
| 421 | unintended overflows. |
| 422 | |
| 423 | Why not use (1<<31) as an offset and a mask? Sitara DDRAM usually resides |
| 424 | there, and users might want to put some shared carveout memory region in |
| 425 | their linker scripts. So 0x80000000 might be a valid .data address. |
| 426 | |
| 427 | Note that we still keep and pass down the original howto. This way we |
| 428 | can reuse this function for several different relocations. */ |
| 429 | static bfd_reloc_status_type |
| 430 | pru_elf32_do_pmem_relocate (bfd *abfd, reloc_howto_type *howto, |
| 431 | asection *input_section, |
| 432 | bfd_byte *data, bfd_vma offset, |
| 433 | bfd_vma symbol_value, bfd_vma addend) |
| 434 | { |
| 435 | symbol_value = symbol_value + addend; |
| 436 | addend = 0; |
| 437 | symbol_value &= 0x3fffff; |
| 438 | return _bfd_final_link_relocate (howto, abfd, input_section, |
| 439 | data, offset, symbol_value, addend); |
| 440 | } |
| 441 | |
| 442 | /* Direct copy of _bfd_final_link_relocate, but with special |
| 443 | "fill-in". This copy-paste mumbo jumbo is only needed because BFD |
| 444 | cannot deal correctly with non-contiguous bit fields. */ |
| 445 | static bfd_reloc_status_type |
| 446 | pru_elf32_do_s10_pcrel_relocate (bfd *input_bfd, reloc_howto_type *howto, |
| 447 | asection *input_section, |
| 448 | bfd_byte *contents, bfd_vma address, |
| 449 | bfd_vma relocation, bfd_vma addend) |
| 450 | { |
| 451 | bfd_byte *location; |
| 452 | bfd_vma x = 0; |
| 453 | bfd_vma qboff; |
| 454 | bfd_reloc_status_type flag = bfd_reloc_ok; |
| 455 | |
| 456 | /* Sanity check the address. */ |
| 457 | if (address > bfd_get_section_limit (input_bfd, input_section)) |
| 458 | return bfd_reloc_outofrange; |
| 459 | |
| 460 | BFD_ASSERT (howto->pc_relative); |
| 461 | BFD_ASSERT (howto->pcrel_offset); |
| 462 | |
| 463 | relocation = relocation + addend - (input_section->output_section->vma |
| 464 | + input_section->output_offset) - address; |
| 465 | |
| 466 | location = contents + address; |
| 467 | |
| 468 | /* Get the value we are going to relocate. */ |
| 469 | BFD_ASSERT (bfd_get_reloc_size (howto) == 4); |
| 470 | x = bfd_get_32 (input_bfd, location); |
| 471 | |
| 472 | qboff = GET_BROFF_SIGNED (x) << howto->rightshift; |
| 473 | relocation += qboff; |
| 474 | |
| 475 | BFD_ASSERT (howto->complain_on_overflow == complain_overflow_bitfield); |
| 476 | |
| 477 | if (relocation > 2047 && relocation < (bfd_vma)-2048l) |
| 478 | flag = bfd_reloc_overflow; |
| 479 | |
| 480 | /* Check that target address is word-aligned. */ |
| 481 | if (relocation & ((1 << howto->rightshift) - 1)) |
| 482 | flag = bfd_reloc_outofrange; |
| 483 | |
| 484 | relocation >>= (bfd_vma) howto->rightshift; |
| 485 | |
| 486 | /* Fill-in the RELOCATION to the right bits of X. */ |
| 487 | SET_BROFF_URAW (x, relocation); |
| 488 | |
| 489 | bfd_put_32 (input_bfd, x, location); |
| 490 | |
| 491 | return flag; |
| 492 | } |
| 493 | |
| 494 | static bfd_reloc_status_type |
| 495 | pru_elf32_do_u8_pcrel_relocate (bfd *abfd, reloc_howto_type *howto, |
| 496 | asection *input_section, |
| 497 | bfd_byte *data, bfd_vma offset, |
| 498 | bfd_vma symbol_value, bfd_vma addend) |
| 499 | { |
| 500 | bfd_vma relocation; |
| 501 | |
| 502 | BFD_ASSERT (howto->pc_relative); |
| 503 | BFD_ASSERT (howto->pcrel_offset); |
| 504 | |
| 505 | relocation = symbol_value + addend - (input_section->output_section->vma |
| 506 | + input_section->output_offset) - offset; |
| 507 | relocation >>= howto->rightshift; |
| 508 | |
| 509 | /* 0 and 1 are invalid target labels for LOOP. We cannot |
| 510 | encode this info in HOWTO, so catch such cases here. */ |
| 511 | if (relocation < 2) |
| 512 | return bfd_reloc_outofrange; |
| 513 | |
| 514 | return _bfd_final_link_relocate (howto, abfd, input_section, |
| 515 | data, offset, symbol_value, addend); |
| 516 | } |
| 517 | |
| 518 | /* Idea and code taken from elf32-d30v. */ |
| 519 | static bfd_reloc_status_type |
| 520 | pru_elf32_do_ldi32_relocate (bfd *abfd, reloc_howto_type *howto, |
| 521 | asection *input_section, |
| 522 | bfd_byte *data, bfd_vma offset, |
| 523 | bfd_vma symbol_value, bfd_vma addend) |
| 524 | { |
| 525 | bfd_signed_vma relocation; |
| 526 | bfd_size_type octets = offset * bfd_octets_per_byte (abfd); |
| 527 | bfd_byte *location; |
| 528 | unsigned long in1, in2, num; |
| 529 | |
| 530 | /* A hacked-up version of _bfd_final_link_relocate() follows. */ |
| 531 | |
| 532 | /* Sanity check the address. */ |
| 533 | if (octets + bfd_get_reloc_size (howto) |
| 534 | > bfd_get_section_limit_octets (abfd, input_section)) |
| 535 | return bfd_reloc_outofrange; |
| 536 | |
| 537 | /* This function assumes that we are dealing with a basic relocation |
| 538 | against a symbol. We want to compute the value of the symbol to |
| 539 | relocate to. This is just VALUE, the value of the symbol, plus |
| 540 | ADDEND, any addend associated with the reloc. */ |
| 541 | relocation = symbol_value + addend; |
| 542 | |
| 543 | BFD_ASSERT (!howto->pc_relative); |
| 544 | |
| 545 | /* A hacked-up version of _bfd_relocate_contents() follows. */ |
| 546 | location = data + offset * bfd_octets_per_byte (abfd); |
| 547 | |
| 548 | BFD_ASSERT (!howto->pc_relative); |
| 549 | |
| 550 | in1 = bfd_get_32 (abfd, location); |
| 551 | in2 = bfd_get_32 (abfd, location + 4); |
| 552 | |
| 553 | /* Extract the addend - should be zero per my understanding. */ |
| 554 | num = GET_INSN_FIELD (IMM16, in1) | (GET_INSN_FIELD (IMM16, in2) << 16); |
| 555 | BFD_ASSERT (!num); |
| 556 | |
| 557 | relocation += num; |
| 558 | |
| 559 | SET_INSN_FIELD (IMM16, in1, relocation & 0xffff); |
| 560 | SET_INSN_FIELD (IMM16, in2, relocation >> 16); |
| 561 | |
| 562 | bfd_put_32 (abfd, in1, location); |
| 563 | bfd_put_32 (abfd, in2, location + 4); |
| 564 | |
| 565 | return bfd_reloc_ok; |
| 566 | } |
| 567 | |
| 568 | /* HOWTO handlers for relocations that require special handling. */ |
| 569 | |
| 570 | static bfd_reloc_status_type |
| 571 | pru_elf32_pmem_relocate (bfd *abfd, arelent *reloc_entry, |
| 572 | asymbol *symbol, void *data, |
| 573 | asection *input_section, bfd *output_bfd, |
| 574 | char **error_message) |
| 575 | { |
| 576 | /* If this is a relocatable link (output_bfd test tells us), just |
| 577 | call the generic function. Any adjustment will be done at final |
| 578 | link time. */ |
| 579 | if (output_bfd != NULL) |
| 580 | return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, |
| 581 | input_section, output_bfd, error_message); |
| 582 | |
| 583 | return pru_elf32_do_pmem_relocate (abfd, reloc_entry->howto, |
| 584 | input_section, |
| 585 | data, reloc_entry->address, |
| 586 | (symbol->value |
| 587 | + symbol->section->output_section->vma |
| 588 | + symbol->section->output_offset), |
| 589 | reloc_entry->addend); |
| 590 | } |
| 591 | |
| 592 | static bfd_reloc_status_type |
| 593 | pru_elf32_s10_pcrel_relocate (bfd *abfd, arelent *reloc_entry, |
| 594 | asymbol *symbol, void *data, |
| 595 | asection *input_section, bfd *output_bfd, |
| 596 | char **error_message) |
| 597 | { |
| 598 | /* If this is a relocatable link (output_bfd test tells us), just |
| 599 | call the generic function. Any adjustment will be done at final |
| 600 | link time. */ |
| 601 | if (output_bfd != NULL) |
| 602 | return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, |
| 603 | input_section, output_bfd, error_message); |
| 604 | |
| 605 | return pru_elf32_do_s10_pcrel_relocate (abfd, reloc_entry->howto, |
| 606 | input_section, data, |
| 607 | reloc_entry->address, |
| 608 | (symbol->value |
| 609 | + symbol->section->output_section->vma |
| 610 | + symbol->section->output_offset), |
| 611 | reloc_entry->addend); |
| 612 | } |
| 613 | |
| 614 | static bfd_reloc_status_type |
| 615 | pru_elf32_u8_pcrel_relocate (bfd *abfd, arelent *reloc_entry, asymbol *symbol, |
| 616 | void *data, asection *input_section, |
| 617 | bfd *output_bfd, |
| 618 | char **error_message) |
| 619 | { |
| 620 | /* If this is a relocatable link (output_bfd test tells us), just |
| 621 | call the generic function. Any adjustment will be done at final |
| 622 | link time. */ |
| 623 | if (output_bfd != NULL) |
| 624 | return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, |
| 625 | input_section, output_bfd, error_message); |
| 626 | |
| 627 | return pru_elf32_do_u8_pcrel_relocate (abfd, reloc_entry->howto, |
| 628 | input_section, |
| 629 | data, reloc_entry->address, |
| 630 | (symbol->value |
| 631 | + symbol->section->output_section->vma |
| 632 | + symbol->section->output_offset), |
| 633 | reloc_entry->addend); |
| 634 | } |
| 635 | |
| 636 | static bfd_reloc_status_type |
| 637 | pru_elf32_ldi32_relocate (bfd *abfd, arelent *reloc_entry, asymbol *symbol, |
| 638 | void *data, asection *input_section, |
| 639 | bfd *output_bfd, |
| 640 | char **error_message) |
| 641 | { |
| 642 | /* If this is a relocatable link (output_bfd test tells us), just |
| 643 | call the generic function. Any adjustment will be done at final |
| 644 | link time. */ |
| 645 | if (output_bfd != NULL) |
| 646 | return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, |
| 647 | input_section, output_bfd, error_message); |
| 648 | |
| 649 | return pru_elf32_do_ldi32_relocate (abfd, reloc_entry->howto, |
| 650 | input_section, |
| 651 | data, reloc_entry->address, |
| 652 | (symbol->value |
| 653 | + symbol->section->output_section->vma |
| 654 | + symbol->section->output_offset), |
| 655 | reloc_entry->addend); |
| 656 | } |
| 657 | |
| 658 | |
| 659 | /* Implement elf_backend_relocate_section. */ |
| 660 | static bfd_boolean |
| 661 | pru_elf32_relocate_section (bfd *output_bfd, |
| 662 | struct bfd_link_info *info, |
| 663 | bfd *input_bfd, |
| 664 | asection *input_section, |
| 665 | bfd_byte *contents, |
| 666 | Elf_Internal_Rela *relocs, |
| 667 | Elf_Internal_Sym *local_syms, |
| 668 | asection **local_sections) |
| 669 | { |
| 670 | Elf_Internal_Shdr *symtab_hdr; |
| 671 | struct elf_link_hash_entry **sym_hashes; |
| 672 | Elf_Internal_Rela *rel; |
| 673 | Elf_Internal_Rela *relend; |
| 674 | |
| 675 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 676 | sym_hashes = elf_sym_hashes (input_bfd); |
| 677 | relend = relocs + input_section->reloc_count; |
| 678 | |
| 679 | for (rel = relocs; rel < relend; rel++) |
| 680 | { |
| 681 | reloc_howto_type *howto; |
| 682 | unsigned long r_symndx; |
| 683 | Elf_Internal_Sym *sym; |
| 684 | asection *sec; |
| 685 | struct elf_link_hash_entry *h; |
| 686 | bfd_vma relocation; |
| 687 | bfd_reloc_status_type r = bfd_reloc_ok; |
| 688 | const char *name = NULL; |
| 689 | const char* msg = (const char*) NULL; |
| 690 | bfd_boolean unresolved_reloc; |
| 691 | |
| 692 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 693 | |
| 694 | howto = lookup_howto ((unsigned) ELF32_R_TYPE (rel->r_info)); |
| 695 | h = NULL; |
| 696 | sym = NULL; |
| 697 | sec = NULL; |
| 698 | |
| 699 | if (r_symndx < symtab_hdr->sh_info) |
| 700 | { |
| 701 | sym = local_syms + r_symndx; |
| 702 | sec = local_sections[r_symndx]; |
| 703 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); |
| 704 | } |
| 705 | else |
| 706 | { |
| 707 | bfd_boolean warned, ignored; |
| 708 | |
| 709 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
| 710 | r_symndx, symtab_hdr, sym_hashes, |
| 711 | h, sec, relocation, |
| 712 | unresolved_reloc, warned, ignored); |
| 713 | } |
| 714 | |
| 715 | if (sec && discarded_section (sec)) |
| 716 | RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, |
| 717 | rel, 1, relend, howto, 0, contents); |
| 718 | |
| 719 | /* Nothing more to do unless this is a final link. */ |
| 720 | if (bfd_link_relocatable (info)) |
| 721 | continue; |
| 722 | |
| 723 | if (howto) |
| 724 | { |
| 725 | switch (howto->type) |
| 726 | { |
| 727 | case R_PRU_NONE: |
| 728 | /* We don't need to find a value for this symbol. It's just a |
| 729 | marker. */ |
| 730 | r = bfd_reloc_ok; |
| 731 | break; |
| 732 | |
| 733 | case R_PRU_U16_PMEMIMM: |
| 734 | case R_PRU_32_PMEM: |
| 735 | case R_PRU_16_PMEM: |
| 736 | r = pru_elf32_do_pmem_relocate (input_bfd, howto, |
| 737 | input_section, |
| 738 | contents, rel->r_offset, |
| 739 | relocation, rel->r_addend); |
| 740 | break; |
| 741 | case R_PRU_S10_PCREL: |
| 742 | r = pru_elf32_do_s10_pcrel_relocate (input_bfd, howto, |
| 743 | input_section, |
| 744 | contents, |
| 745 | rel->r_offset, |
| 746 | relocation, |
| 747 | rel->r_addend); |
| 748 | break; |
| 749 | case R_PRU_U8_PCREL: |
| 750 | r = pru_elf32_do_u8_pcrel_relocate (input_bfd, howto, |
| 751 | input_section, |
| 752 | contents, |
| 753 | rel->r_offset, |
| 754 | relocation, |
| 755 | rel->r_addend); |
| 756 | break; |
| 757 | case R_PRU_LDI32: |
| 758 | r = pru_elf32_do_ldi32_relocate (input_bfd, howto, |
| 759 | input_section, |
| 760 | contents, |
| 761 | rel->r_offset, |
| 762 | relocation, |
| 763 | rel->r_addend); |
| 764 | break; |
| 765 | case R_PRU_GNU_DIFF8: |
| 766 | case R_PRU_GNU_DIFF16: |
| 767 | case R_PRU_GNU_DIFF32: |
| 768 | case R_PRU_GNU_DIFF16_PMEM: |
| 769 | case R_PRU_GNU_DIFF32_PMEM: |
| 770 | /* Nothing to do here, as contents already contain the |
| 771 | diff value. */ |
| 772 | r = bfd_reloc_ok; |
| 773 | break; |
| 774 | |
| 775 | default: |
| 776 | r = _bfd_final_link_relocate (howto, input_bfd, |
| 777 | input_section, contents, |
| 778 | rel->r_offset, relocation, |
| 779 | rel->r_addend); |
| 780 | break; |
| 781 | } |
| 782 | } |
| 783 | else |
| 784 | r = bfd_reloc_notsupported; |
| 785 | |
| 786 | if (r != bfd_reloc_ok) |
| 787 | { |
| 788 | if (h != NULL) |
| 789 | name = h->root.root.string; |
| 790 | else |
| 791 | { |
| 792 | name = bfd_elf_string_from_elf_section (input_bfd, |
| 793 | symtab_hdr->sh_link, |
| 794 | sym->st_name); |
| 795 | if (name == NULL || *name == '\0') |
| 796 | name = bfd_section_name (input_bfd, sec); |
| 797 | } |
| 798 | |
| 799 | switch (r) |
| 800 | { |
| 801 | case bfd_reloc_overflow: |
| 802 | (*info->callbacks->reloc_overflow) (info, NULL, name, |
| 803 | howto->name, (bfd_vma) 0, |
| 804 | input_bfd, input_section, |
| 805 | rel->r_offset); |
| 806 | break; |
| 807 | |
| 808 | case bfd_reloc_undefined: |
| 809 | (*info->callbacks->undefined_symbol) (info, name, input_bfd, |
| 810 | input_section, |
| 811 | rel->r_offset, TRUE); |
| 812 | break; |
| 813 | |
| 814 | case bfd_reloc_outofrange: |
| 815 | if (msg == NULL) |
| 816 | msg = _("relocation out of range"); |
| 817 | break; |
| 818 | |
| 819 | case bfd_reloc_notsupported: |
| 820 | if (msg == NULL) |
| 821 | msg = _("unsupported relocation"); |
| 822 | break; |
| 823 | |
| 824 | case bfd_reloc_dangerous: |
| 825 | if (msg == NULL) |
| 826 | msg = _("dangerous relocation"); |
| 827 | break; |
| 828 | |
| 829 | default: |
| 830 | if (msg == NULL) |
| 831 | msg = _("unknown error"); |
| 832 | break; |
| 833 | } |
| 834 | |
| 835 | if (msg) |
| 836 | { |
| 837 | (*info->callbacks->warning) (info, msg, name, input_bfd, |
| 838 | input_section, rel->r_offset); |
| 839 | return FALSE; |
| 840 | } |
| 841 | } |
| 842 | } |
| 843 | return TRUE; |
| 844 | } |
| 845 | |
| 846 | \f |
| 847 | /* Perform a diff relocation. Nothing to do, as the difference value is |
| 848 | already written into the section's contents. */ |
| 849 | |
| 850 | static bfd_reloc_status_type |
| 851 | bfd_elf_pru_diff_relocate (bfd *abfd ATTRIBUTE_UNUSED, |
| 852 | arelent *reloc_entry ATTRIBUTE_UNUSED, |
| 853 | asymbol *symbol ATTRIBUTE_UNUSED, |
| 854 | void *data ATTRIBUTE_UNUSED, |
| 855 | asection *input_section ATTRIBUTE_UNUSED, |
| 856 | bfd *output_bfd ATTRIBUTE_UNUSED, |
| 857 | char **error_message ATTRIBUTE_UNUSED) |
| 858 | { |
| 859 | return bfd_reloc_ok; |
| 860 | } |
| 861 | |
| 862 | |
| 863 | /* Returns whether the relocation type passed is a diff reloc. */ |
| 864 | |
| 865 | static bfd_boolean |
| 866 | elf32_pru_is_diff_reloc (Elf_Internal_Rela *irel) |
| 867 | { |
| 868 | return (ELF32_R_TYPE (irel->r_info) == R_PRU_GNU_DIFF8 |
| 869 | || ELF32_R_TYPE (irel->r_info) == R_PRU_GNU_DIFF16 |
| 870 | || ELF32_R_TYPE (irel->r_info) == R_PRU_GNU_DIFF32 |
| 871 | || ELF32_R_TYPE (irel->r_info) == R_PRU_GNU_DIFF16_PMEM |
| 872 | || ELF32_R_TYPE (irel->r_info) == R_PRU_GNU_DIFF32_PMEM); |
| 873 | } |
| 874 | |
| 875 | /* Reduce the diff value written in the section by count if the shrinked |
| 876 | insn address happens to fall between the two symbols for which this |
| 877 | diff reloc was emitted. */ |
| 878 | |
| 879 | static void |
| 880 | elf32_pru_adjust_diff_reloc_value (bfd *abfd, |
| 881 | struct bfd_section *isec, |
| 882 | Elf_Internal_Rela *irel, |
| 883 | bfd_vma symval, |
| 884 | bfd_vma shrinked_insn_address, |
| 885 | int count) |
| 886 | { |
| 887 | unsigned char *reloc_contents = NULL; |
| 888 | unsigned char *isec_contents = elf_section_data (isec)->this_hdr.contents; |
| 889 | if (isec_contents == NULL) |
| 890 | { |
| 891 | if (! bfd_malloc_and_get_section (abfd, isec, &isec_contents)) |
| 892 | return; |
| 893 | |
| 894 | elf_section_data (isec)->this_hdr.contents = isec_contents; |
| 895 | } |
| 896 | |
| 897 | reloc_contents = isec_contents + irel->r_offset; |
| 898 | |
| 899 | /* Read value written in object file. */ |
| 900 | bfd_signed_vma x = 0; |
| 901 | switch (ELF32_R_TYPE (irel->r_info)) |
| 902 | { |
| 903 | case R_PRU_GNU_DIFF8: |
| 904 | { |
| 905 | x = bfd_get_signed_8 (abfd, reloc_contents); |
| 906 | break; |
| 907 | } |
| 908 | case R_PRU_GNU_DIFF16: |
| 909 | { |
| 910 | x = bfd_get_signed_16 (abfd, reloc_contents); |
| 911 | break; |
| 912 | } |
| 913 | case R_PRU_GNU_DIFF32: |
| 914 | { |
| 915 | x = bfd_get_signed_32 (abfd, reloc_contents); |
| 916 | break; |
| 917 | } |
| 918 | case R_PRU_GNU_DIFF16_PMEM: |
| 919 | { |
| 920 | x = bfd_get_signed_16 (abfd, reloc_contents) * 4; |
| 921 | break; |
| 922 | } |
| 923 | case R_PRU_GNU_DIFF32_PMEM: |
| 924 | { |
| 925 | x = bfd_get_signed_32 (abfd, reloc_contents) * 4; |
| 926 | break; |
| 927 | } |
| 928 | default: |
| 929 | { |
| 930 | BFD_FAIL (); |
| 931 | } |
| 932 | } |
| 933 | |
| 934 | /* For a diff reloc sym1 - sym2 the diff at assembly time (x) is written |
| 935 | into the object file at the reloc offset. sym2's logical value is |
| 936 | symval (<start_of_section>) + reloc addend. Compute the start and end |
| 937 | addresses and check if the shrinked insn falls between sym1 and sym2. */ |
| 938 | |
| 939 | bfd_vma end_address = symval + irel->r_addend; |
| 940 | bfd_vma start_address = end_address - x; |
| 941 | |
| 942 | /* Shrink the absolute DIFF value (get the to labels "closer" |
| 943 | together), because we have removed data between labels. */ |
| 944 | if (x < 0) |
| 945 | { |
| 946 | x += count; |
| 947 | /* In case the signed x is negative, restore order. */ |
| 948 | SWAP_VALS (end_address, start_address); |
| 949 | } |
| 950 | else |
| 951 | { |
| 952 | x -= count; |
| 953 | } |
| 954 | |
| 955 | /* Reduce the diff value by count bytes and write it back into section |
| 956 | contents. */ |
| 957 | |
| 958 | if (shrinked_insn_address >= start_address |
| 959 | && shrinked_insn_address <= end_address) |
| 960 | { |
| 961 | switch (ELF32_R_TYPE (irel->r_info)) |
| 962 | { |
| 963 | case R_PRU_GNU_DIFF8: |
| 964 | { |
| 965 | bfd_put_signed_8 (abfd, x & 0xFF, reloc_contents); |
| 966 | break; |
| 967 | } |
| 968 | case R_PRU_GNU_DIFF16: |
| 969 | { |
| 970 | bfd_put_signed_16 (abfd, x & 0xFFFF, reloc_contents); |
| 971 | break; |
| 972 | } |
| 973 | case R_PRU_GNU_DIFF32: |
| 974 | { |
| 975 | bfd_put_signed_32 (abfd, x & 0xFFFFFFFF, reloc_contents); |
| 976 | break; |
| 977 | } |
| 978 | case R_PRU_GNU_DIFF16_PMEM: |
| 979 | { |
| 980 | bfd_put_signed_16 (abfd, (x / 4) & 0xFFFF, reloc_contents); |
| 981 | break; |
| 982 | } |
| 983 | case R_PRU_GNU_DIFF32_PMEM: |
| 984 | { |
| 985 | bfd_put_signed_32 (abfd, (x / 4) & 0xFFFFFFFF, reloc_contents); |
| 986 | break; |
| 987 | } |
| 988 | default: |
| 989 | { |
| 990 | BFD_FAIL (); |
| 991 | } |
| 992 | } |
| 993 | |
| 994 | } |
| 995 | } |
| 996 | |
| 997 | /* Delete some bytes from a section while changing the size of an instruction. |
| 998 | The parameter "addr" denotes the section-relative offset pointing just |
| 999 | behind the shrinked instruction. "addr+count" point at the first |
| 1000 | byte just behind the original unshrinked instruction. |
| 1001 | |
| 1002 | Idea copied from the AVR port. */ |
| 1003 | |
| 1004 | static bfd_boolean |
| 1005 | pru_elf_relax_delete_bytes (bfd *abfd, |
| 1006 | asection *sec, |
| 1007 | bfd_vma addr, |
| 1008 | int count) |
| 1009 | { |
| 1010 | Elf_Internal_Shdr *symtab_hdr; |
| 1011 | unsigned int sec_shndx; |
| 1012 | bfd_byte *contents; |
| 1013 | Elf_Internal_Rela *irel, *irelend; |
| 1014 | Elf_Internal_Sym *isym; |
| 1015 | Elf_Internal_Sym *isymbuf = NULL; |
| 1016 | bfd_vma toaddr; |
| 1017 | struct elf_link_hash_entry **sym_hashes; |
| 1018 | struct elf_link_hash_entry **end_hashes; |
| 1019 | unsigned int symcount; |
| 1020 | |
| 1021 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 1022 | sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); |
| 1023 | contents = elf_section_data (sec)->this_hdr.contents; |
| 1024 | |
| 1025 | toaddr = sec->size; |
| 1026 | |
| 1027 | irel = elf_section_data (sec)->relocs; |
| 1028 | irelend = irel + sec->reloc_count; |
| 1029 | |
| 1030 | /* Actually delete the bytes. */ |
| 1031 | if (toaddr - addr - count > 0) |
| 1032 | memmove (contents + addr, contents + addr + count, |
| 1033 | (size_t) (toaddr - addr - count)); |
| 1034 | sec->size -= count; |
| 1035 | |
| 1036 | /* Adjust all the reloc addresses. */ |
| 1037 | for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++) |
| 1038 | { |
| 1039 | bfd_vma old_reloc_address; |
| 1040 | |
| 1041 | old_reloc_address = (sec->output_section->vma |
| 1042 | + sec->output_offset + irel->r_offset); |
| 1043 | |
| 1044 | /* Get the new reloc address. */ |
| 1045 | if ((irel->r_offset > addr |
| 1046 | && irel->r_offset < toaddr)) |
| 1047 | { |
| 1048 | if (debug_relax) |
| 1049 | printf ("Relocation at address 0x%x needs to be moved.\n" |
| 1050 | "Old section offset: 0x%x, New section offset: 0x%x \n", |
| 1051 | (unsigned int) old_reloc_address, |
| 1052 | (unsigned int) irel->r_offset, |
| 1053 | (unsigned int) ((irel->r_offset) - count)); |
| 1054 | |
| 1055 | irel->r_offset -= count; |
| 1056 | } |
| 1057 | |
| 1058 | } |
| 1059 | |
| 1060 | /* The reloc's own addresses are now ok. However, we need to readjust |
| 1061 | the reloc's addend, i.e. the reloc's value if two conditions are met: |
| 1062 | 1.) the reloc is relative to a symbol in this section that |
| 1063 | is located in front of the shrinked instruction |
| 1064 | 2.) symbol plus addend end up behind the shrinked instruction. |
| 1065 | |
| 1066 | The most common case where this happens are relocs relative to |
| 1067 | the section-start symbol. |
| 1068 | |
| 1069 | This step needs to be done for all of the sections of the bfd. */ |
| 1070 | |
| 1071 | { |
| 1072 | struct bfd_section *isec; |
| 1073 | |
| 1074 | for (isec = abfd->sections; isec; isec = isec->next) |
| 1075 | { |
| 1076 | bfd_vma symval; |
| 1077 | bfd_vma shrinked_insn_address; |
| 1078 | |
| 1079 | if (isec->reloc_count == 0) |
| 1080 | continue; |
| 1081 | |
| 1082 | shrinked_insn_address = (sec->output_section->vma |
| 1083 | + sec->output_offset + addr - count); |
| 1084 | |
| 1085 | irel = elf_section_data (isec)->relocs; |
| 1086 | /* PR 12161: Read in the relocs for this section if necessary. */ |
| 1087 | if (irel == NULL) |
| 1088 | irel = _bfd_elf_link_read_relocs (abfd, isec, NULL, NULL, TRUE); |
| 1089 | |
| 1090 | for (irelend = irel + isec->reloc_count; |
| 1091 | irel < irelend; |
| 1092 | irel++) |
| 1093 | { |
| 1094 | /* Read this BFD's local symbols if we haven't done |
| 1095 | so already. */ |
| 1096 | if (isymbuf == NULL && symtab_hdr->sh_info != 0) |
| 1097 | { |
| 1098 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 1099 | if (isymbuf == NULL) |
| 1100 | isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, |
| 1101 | symtab_hdr->sh_info, 0, |
| 1102 | NULL, NULL, NULL); |
| 1103 | if (isymbuf == NULL) |
| 1104 | return FALSE; |
| 1105 | } |
| 1106 | |
| 1107 | /* Get the value of the symbol referred to by the reloc. */ |
| 1108 | if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) |
| 1109 | { |
| 1110 | /* A local symbol. */ |
| 1111 | asection *sym_sec; |
| 1112 | |
| 1113 | isym = isymbuf + ELF32_R_SYM (irel->r_info); |
| 1114 | sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| 1115 | symval = isym->st_value; |
| 1116 | /* If the reloc is absolute, it will not have |
| 1117 | a symbol or section associated with it. */ |
| 1118 | if (sym_sec == sec) |
| 1119 | { |
| 1120 | symval += sym_sec->output_section->vma |
| 1121 | + sym_sec->output_offset; |
| 1122 | |
| 1123 | if (debug_relax) |
| 1124 | printf ("Checking if the relocation's " |
| 1125 | "addend needs corrections.\n" |
| 1126 | "Address of anchor symbol: 0x%x \n" |
| 1127 | "Address of relocation target: 0x%x \n" |
| 1128 | "Address of relaxed insn: 0x%x \n", |
| 1129 | (unsigned int) symval, |
| 1130 | (unsigned int) (symval + irel->r_addend), |
| 1131 | (unsigned int) shrinked_insn_address); |
| 1132 | |
| 1133 | /* Shrink the special DIFF relocations. */ |
| 1134 | if (elf32_pru_is_diff_reloc (irel)) |
| 1135 | { |
| 1136 | elf32_pru_adjust_diff_reloc_value (abfd, isec, irel, |
| 1137 | symval, |
| 1138 | shrinked_insn_address, |
| 1139 | count); |
| 1140 | } |
| 1141 | |
| 1142 | /* Fix the addend, if it is affected. */ |
| 1143 | if (symval <= shrinked_insn_address |
| 1144 | && (symval + irel->r_addend) > shrinked_insn_address) |
| 1145 | { |
| 1146 | |
| 1147 | irel->r_addend -= count; |
| 1148 | |
| 1149 | if (debug_relax) |
| 1150 | printf ("Relocation's addend needed to be fixed \n"); |
| 1151 | } |
| 1152 | } |
| 1153 | /* else...Reference symbol is absolute. |
| 1154 | No adjustment needed. */ |
| 1155 | } |
| 1156 | /* else...Reference symbol is extern. No need for adjusting |
| 1157 | the addend. */ |
| 1158 | } |
| 1159 | } |
| 1160 | } |
| 1161 | |
| 1162 | /* Adjust the local symbols defined in this section. */ |
| 1163 | isym = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 1164 | /* Fix PR 9841, there may be no local symbols. */ |
| 1165 | if (isym != NULL) |
| 1166 | { |
| 1167 | Elf_Internal_Sym *isymend; |
| 1168 | |
| 1169 | isymend = isym + symtab_hdr->sh_info; |
| 1170 | for (; isym < isymend; isym++) |
| 1171 | { |
| 1172 | if (isym->st_shndx == sec_shndx) |
| 1173 | { |
| 1174 | if (isym->st_value > addr |
| 1175 | && isym->st_value <= toaddr) |
| 1176 | isym->st_value -= count; |
| 1177 | |
| 1178 | if (isym->st_value <= addr |
| 1179 | && isym->st_value + isym->st_size > addr) |
| 1180 | { |
| 1181 | /* If this assert fires then we have a symbol that ends |
| 1182 | part way through an instruction. Does that make |
| 1183 | sense? */ |
| 1184 | BFD_ASSERT (isym->st_value + isym->st_size >= addr + count); |
| 1185 | isym->st_size -= count; |
| 1186 | } |
| 1187 | } |
| 1188 | } |
| 1189 | } |
| 1190 | |
| 1191 | /* Now adjust the global symbols defined in this section. */ |
| 1192 | symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) |
| 1193 | - symtab_hdr->sh_info); |
| 1194 | sym_hashes = elf_sym_hashes (abfd); |
| 1195 | end_hashes = sym_hashes + symcount; |
| 1196 | for (; sym_hashes < end_hashes; sym_hashes++) |
| 1197 | { |
| 1198 | struct elf_link_hash_entry *sym_hash = *sym_hashes; |
| 1199 | if ((sym_hash->root.type == bfd_link_hash_defined |
| 1200 | || sym_hash->root.type == bfd_link_hash_defweak) |
| 1201 | && sym_hash->root.u.def.section == sec) |
| 1202 | { |
| 1203 | if (sym_hash->root.u.def.value > addr |
| 1204 | && sym_hash->root.u.def.value <= toaddr) |
| 1205 | sym_hash->root.u.def.value -= count; |
| 1206 | |
| 1207 | if (sym_hash->root.u.def.value <= addr |
| 1208 | && (sym_hash->root.u.def.value + sym_hash->size > addr)) |
| 1209 | { |
| 1210 | /* If this assert fires then we have a symbol that ends |
| 1211 | part way through an instruction. Does that make |
| 1212 | sense? */ |
| 1213 | BFD_ASSERT (sym_hash->root.u.def.value + sym_hash->size |
| 1214 | >= addr + count); |
| 1215 | sym_hash->size -= count; |
| 1216 | } |
| 1217 | } |
| 1218 | } |
| 1219 | |
| 1220 | return TRUE; |
| 1221 | } |
| 1222 | |
| 1223 | static bfd_boolean |
| 1224 | pru_elf32_relax_section (bfd * abfd, asection * sec, |
| 1225 | struct bfd_link_info * link_info, |
| 1226 | bfd_boolean * again) |
| 1227 | { |
| 1228 | Elf_Internal_Shdr * symtab_hdr; |
| 1229 | Elf_Internal_Rela * internal_relocs; |
| 1230 | Elf_Internal_Rela * irel; |
| 1231 | Elf_Internal_Rela * irelend; |
| 1232 | bfd_byte * contents = NULL; |
| 1233 | Elf_Internal_Sym * isymbuf = NULL; |
| 1234 | |
| 1235 | /* Assume nothing changes. */ |
| 1236 | *again = FALSE; |
| 1237 | |
| 1238 | /* We don't have to do anything for a relocatable link, if |
| 1239 | this section does not have relocs, or if this is not a |
| 1240 | code section. */ |
| 1241 | if (bfd_link_relocatable (link_info) |
| 1242 | || (sec->flags & SEC_RELOC) == 0 |
| 1243 | || sec->reloc_count == 0 || (sec->flags & SEC_CODE) == 0) |
| 1244 | return TRUE; |
| 1245 | |
| 1246 | symtab_hdr = & elf_tdata (abfd)->symtab_hdr; |
| 1247 | |
| 1248 | /* Get a copy of the native relocations. */ |
| 1249 | internal_relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, |
| 1250 | link_info->keep_memory); |
| 1251 | if (internal_relocs == NULL) |
| 1252 | goto error_return; |
| 1253 | |
| 1254 | /* Walk through them looking for relaxing opportunities. */ |
| 1255 | irelend = internal_relocs + sec->reloc_count; |
| 1256 | |
| 1257 | for (irel = internal_relocs; irel < irelend; irel++) |
| 1258 | { |
| 1259 | bfd_vma symval; |
| 1260 | |
| 1261 | /* Get the section contents if we haven't done so already. */ |
| 1262 | if (contents == NULL) |
| 1263 | { |
| 1264 | /* Get cached copy if it exists. */ |
| 1265 | if (elf_section_data (sec)->this_hdr.contents != NULL) |
| 1266 | contents = elf_section_data (sec)->this_hdr.contents; |
| 1267 | else if (! bfd_malloc_and_get_section (abfd, sec, &contents)) |
| 1268 | goto error_return; |
| 1269 | } |
| 1270 | |
| 1271 | /* Read this BFD's local symbols if we haven't done so already. */ |
| 1272 | if (isymbuf == NULL && symtab_hdr->sh_info != 0) |
| 1273 | { |
| 1274 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 1275 | if (isymbuf == NULL) |
| 1276 | isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, |
| 1277 | symtab_hdr->sh_info, 0, |
| 1278 | NULL, NULL, NULL); |
| 1279 | if (isymbuf == NULL) |
| 1280 | goto error_return; |
| 1281 | } |
| 1282 | |
| 1283 | /* Get the value of the symbol referred to by the reloc. */ |
| 1284 | if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) |
| 1285 | { |
| 1286 | /* A local symbol. */ |
| 1287 | Elf_Internal_Sym *isym; |
| 1288 | asection *sym_sec; |
| 1289 | |
| 1290 | isym = isymbuf + ELF32_R_SYM (irel->r_info); |
| 1291 | if (isym->st_shndx == SHN_UNDEF) |
| 1292 | sym_sec = bfd_und_section_ptr; |
| 1293 | else if (isym->st_shndx == SHN_ABS) |
| 1294 | sym_sec = bfd_abs_section_ptr; |
| 1295 | else if (isym->st_shndx == SHN_COMMON) |
| 1296 | sym_sec = bfd_com_section_ptr; |
| 1297 | else |
| 1298 | sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| 1299 | symval = (isym->st_value |
| 1300 | + sym_sec->output_section->vma + sym_sec->output_offset); |
| 1301 | } |
| 1302 | else |
| 1303 | { |
| 1304 | unsigned long indx; |
| 1305 | struct elf_link_hash_entry *h; |
| 1306 | |
| 1307 | /* An external symbol. */ |
| 1308 | indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; |
| 1309 | h = elf_sym_hashes (abfd)[indx]; |
| 1310 | BFD_ASSERT (h != NULL); |
| 1311 | |
| 1312 | if (h->root.type != bfd_link_hash_defined |
| 1313 | && h->root.type != bfd_link_hash_defweak) |
| 1314 | /* This appears to be a reference to an undefined |
| 1315 | symbol. Just ignore it--it will be caught by the |
| 1316 | regular reloc processing. */ |
| 1317 | continue; |
| 1318 | |
| 1319 | symval = (h->root.u.def.value |
| 1320 | + h->root.u.def.section->output_section->vma |
| 1321 | + h->root.u.def.section->output_offset); |
| 1322 | } |
| 1323 | |
| 1324 | /* For simplicity of coding, we are going to modify the section |
| 1325 | contents, the section relocs, and the BFD symbol table. We |
| 1326 | must tell the rest of the code not to free up this |
| 1327 | information. It would be possible to instead create a table |
| 1328 | of changes which have to be made, as is done in coff-mips.c; |
| 1329 | that would be more work, but would require less memory when |
| 1330 | the linker is run. */ |
| 1331 | |
| 1332 | /* Check if we can remove an LDI instruction from the LDI32 |
| 1333 | pseudo instruction if the upper 16 operand bits are zero. */ |
| 1334 | if (ELF32_R_TYPE (irel->r_info) == (int) R_PRU_LDI32) |
| 1335 | { |
| 1336 | bfd_vma value = symval + irel->r_addend; |
| 1337 | |
| 1338 | if (debug_relax) |
| 1339 | printf ("R_PRU_LDI32 with value=0x%lx\n", (long) value); |
| 1340 | |
| 1341 | if ((long) value >> 16 == 0) |
| 1342 | { |
| 1343 | /* Note that we've changed the relocs, section contents. */ |
| 1344 | elf_section_data (sec)->relocs = internal_relocs; |
| 1345 | elf_section_data (sec)->this_hdr.contents = contents; |
| 1346 | symtab_hdr->contents = (unsigned char *) isymbuf; |
| 1347 | |
| 1348 | /* Delete bytes. */ |
| 1349 | if (!pru_elf_relax_delete_bytes (abfd, sec, irel->r_offset + 4, 4)) |
| 1350 | goto error_return; |
| 1351 | |
| 1352 | /* We're done with deletion of the second instruction. |
| 1353 | Set a regular LDI relocation for the first instruction |
| 1354 | we left to load the 16-bit value into the 32-bit |
| 1355 | register. */ |
| 1356 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| 1357 | R_PRU_U16); |
| 1358 | |
| 1359 | /* That will change things, so, we should relax again. |
| 1360 | Note that this is not required, and it may be slow. */ |
| 1361 | *again = TRUE; |
| 1362 | } |
| 1363 | } |
| 1364 | } |
| 1365 | |
| 1366 | if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) |
| 1367 | { |
| 1368 | if (!link_info->keep_memory) |
| 1369 | free (isymbuf); |
| 1370 | else |
| 1371 | { |
| 1372 | /* Cache the symbols for elf_link_input_bfd. */ |
| 1373 | symtab_hdr->contents = (unsigned char *) isymbuf; |
| 1374 | } |
| 1375 | } |
| 1376 | |
| 1377 | if (contents != NULL |
| 1378 | && elf_section_data (sec)->this_hdr.contents != contents) |
| 1379 | { |
| 1380 | if (!link_info->keep_memory) |
| 1381 | free (contents); |
| 1382 | else |
| 1383 | { |
| 1384 | /* Cache the section contents for elf_link_input_bfd. */ |
| 1385 | elf_section_data (sec)->this_hdr.contents = contents; |
| 1386 | } |
| 1387 | } |
| 1388 | |
| 1389 | if (internal_relocs != NULL |
| 1390 | && elf_section_data (sec)->relocs != internal_relocs) |
| 1391 | free (internal_relocs); |
| 1392 | |
| 1393 | return TRUE; |
| 1394 | |
| 1395 | error_return: |
| 1396 | if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) |
| 1397 | free (isymbuf); |
| 1398 | if (contents != NULL |
| 1399 | && elf_section_data (sec)->this_hdr.contents != contents) |
| 1400 | free (contents); |
| 1401 | if (internal_relocs != NULL |
| 1402 | && elf_section_data (sec)->relocs != internal_relocs) |
| 1403 | free (internal_relocs); |
| 1404 | |
| 1405 | return FALSE; |
| 1406 | } |
| 1407 | |
| 1408 | /* Free the derived linker hash table. */ |
| 1409 | static void |
| 1410 | pru_elf32_link_hash_table_free (bfd *obfd) |
| 1411 | { |
| 1412 | _bfd_elf_link_hash_table_free (obfd); |
| 1413 | } |
| 1414 | |
| 1415 | /* Implement bfd_elf32_bfd_link_hash_table_create. */ |
| 1416 | static struct bfd_link_hash_table * |
| 1417 | pru_elf32_link_hash_table_create (bfd *abfd) |
| 1418 | { |
| 1419 | struct elf_link_hash_table *ret; |
| 1420 | bfd_size_type amt = sizeof (struct elf_link_hash_table); |
| 1421 | |
| 1422 | ret = bfd_zmalloc (amt); |
| 1423 | if (ret == NULL) |
| 1424 | return NULL; |
| 1425 | |
| 1426 | if (!_bfd_elf_link_hash_table_init (ret, abfd, |
| 1427 | link_hash_newfunc, |
| 1428 | sizeof (struct |
| 1429 | elf_link_hash_entry), |
| 1430 | PRU_ELF_DATA)) |
| 1431 | { |
| 1432 | free (ret); |
| 1433 | return NULL; |
| 1434 | } |
| 1435 | |
| 1436 | ret->root.hash_table_free = pru_elf32_link_hash_table_free; |
| 1437 | |
| 1438 | return &ret->root; |
| 1439 | } |
| 1440 | |
| 1441 | #define ELF_ARCH bfd_arch_pru |
| 1442 | #define ELF_TARGET_ID PRU_ELF_DATA |
| 1443 | #define ELF_MACHINE_CODE EM_TI_PRU |
| 1444 | |
| 1445 | #define ELF_MAXPAGESIZE 1 |
| 1446 | |
| 1447 | #define bfd_elf32_bfd_link_hash_table_create \ |
| 1448 | pru_elf32_link_hash_table_create |
| 1449 | |
| 1450 | /* Relocation table lookup macros. */ |
| 1451 | |
| 1452 | #define bfd_elf32_bfd_reloc_type_lookup pru_elf32_bfd_reloc_type_lookup |
| 1453 | #define bfd_elf32_bfd_reloc_name_lookup pru_elf32_bfd_reloc_name_lookup |
| 1454 | |
| 1455 | /* elf_info_to_howto (using RELA relocations). */ |
| 1456 | |
| 1457 | #define elf_info_to_howto pru_elf32_info_to_howto |
| 1458 | |
| 1459 | /* elf backend functions. */ |
| 1460 | |
| 1461 | #define elf_backend_rela_normal 1 |
| 1462 | |
| 1463 | #define elf_backend_relocate_section pru_elf32_relocate_section |
| 1464 | #define bfd_elf32_bfd_relax_section pru_elf32_relax_section |
| 1465 | |
| 1466 | #define TARGET_LITTLE_SYM pru_elf32_vec |
| 1467 | #define TARGET_LITTLE_NAME "elf32-pru" |
| 1468 | |
| 1469 | #include "elf32-target.h" |