| 1 | /* RISC-V-specific support for NN-bit ELF. |
| 2 | Copyright (C) 2011-2017 Free Software Foundation, Inc. |
| 3 | |
| 4 | Contributed by Andrew Waterman (andrew@sifive.com). |
| 5 | Based on TILE-Gx and MIPS targets. |
| 6 | |
| 7 | This file is part of BFD, the Binary File Descriptor library. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 3 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program; see the file COPYING3. If not, |
| 21 | see <http://www.gnu.org/licenses/>. */ |
| 22 | |
| 23 | /* This file handles RISC-V 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 "elfxx-riscv.h" |
| 32 | #include "elf/riscv.h" |
| 33 | #include "opcode/riscv.h" |
| 34 | |
| 35 | #define ARCH_SIZE NN |
| 36 | |
| 37 | #define MINUS_ONE ((bfd_vma)0 - 1) |
| 38 | |
| 39 | #define RISCV_ELF_LOG_WORD_BYTES (ARCH_SIZE == 32 ? 2 : 3) |
| 40 | |
| 41 | #define RISCV_ELF_WORD_BYTES (1 << RISCV_ELF_LOG_WORD_BYTES) |
| 42 | |
| 43 | /* The name of the dynamic interpreter. This is put in the .interp |
| 44 | section. */ |
| 45 | |
| 46 | #define ELF64_DYNAMIC_INTERPRETER "/lib/ld.so.1" |
| 47 | #define ELF32_DYNAMIC_INTERPRETER "/lib32/ld.so.1" |
| 48 | |
| 49 | #define ELF_ARCH bfd_arch_riscv |
| 50 | #define ELF_TARGET_ID RISCV_ELF_DATA |
| 51 | #define ELF_MACHINE_CODE EM_RISCV |
| 52 | #define ELF_MAXPAGESIZE 0x1000 |
| 53 | #define ELF_COMMONPAGESIZE 0x1000 |
| 54 | |
| 55 | /* The global pointer's symbol name. */ |
| 56 | |
| 57 | #define GP_NAME "__global_pointer$" |
| 58 | |
| 59 | /* The RISC-V linker needs to keep track of the number of relocs that it |
| 60 | decides to copy as dynamic relocs in check_relocs for each symbol. |
| 61 | This is so that it can later discard them if they are found to be |
| 62 | unnecessary. We store the information in a field extending the |
| 63 | regular ELF linker hash table. */ |
| 64 | |
| 65 | struct riscv_elf_dyn_relocs |
| 66 | { |
| 67 | struct riscv_elf_dyn_relocs *next; |
| 68 | |
| 69 | /* The input section of the reloc. */ |
| 70 | asection *sec; |
| 71 | |
| 72 | /* Total number of relocs copied for the input section. */ |
| 73 | bfd_size_type count; |
| 74 | |
| 75 | /* Number of pc-relative relocs copied for the input section. */ |
| 76 | bfd_size_type pc_count; |
| 77 | }; |
| 78 | |
| 79 | /* RISC-V ELF linker hash entry. */ |
| 80 | |
| 81 | struct riscv_elf_link_hash_entry |
| 82 | { |
| 83 | struct elf_link_hash_entry elf; |
| 84 | |
| 85 | /* Track dynamic relocs copied for this symbol. */ |
| 86 | struct riscv_elf_dyn_relocs *dyn_relocs; |
| 87 | |
| 88 | #define GOT_UNKNOWN 0 |
| 89 | #define GOT_NORMAL 1 |
| 90 | #define GOT_TLS_GD 2 |
| 91 | #define GOT_TLS_IE 4 |
| 92 | #define GOT_TLS_LE 8 |
| 93 | char tls_type; |
| 94 | }; |
| 95 | |
| 96 | #define riscv_elf_hash_entry(ent) \ |
| 97 | ((struct riscv_elf_link_hash_entry *)(ent)) |
| 98 | |
| 99 | struct _bfd_riscv_elf_obj_tdata |
| 100 | { |
| 101 | struct elf_obj_tdata root; |
| 102 | |
| 103 | /* tls_type for each local got entry. */ |
| 104 | char *local_got_tls_type; |
| 105 | }; |
| 106 | |
| 107 | #define _bfd_riscv_elf_tdata(abfd) \ |
| 108 | ((struct _bfd_riscv_elf_obj_tdata *) (abfd)->tdata.any) |
| 109 | |
| 110 | #define _bfd_riscv_elf_local_got_tls_type(abfd) \ |
| 111 | (_bfd_riscv_elf_tdata (abfd)->local_got_tls_type) |
| 112 | |
| 113 | #define _bfd_riscv_elf_tls_type(abfd, h, symndx) \ |
| 114 | (*((h) != NULL ? &riscv_elf_hash_entry (h)->tls_type \ |
| 115 | : &_bfd_riscv_elf_local_got_tls_type (abfd) [symndx])) |
| 116 | |
| 117 | #define is_riscv_elf(bfd) \ |
| 118 | (bfd_get_flavour (bfd) == bfd_target_elf_flavour \ |
| 119 | && elf_tdata (bfd) != NULL \ |
| 120 | && elf_object_id (bfd) == RISCV_ELF_DATA) |
| 121 | |
| 122 | #include "elf/common.h" |
| 123 | #include "elf/internal.h" |
| 124 | |
| 125 | struct riscv_elf_link_hash_table |
| 126 | { |
| 127 | struct elf_link_hash_table elf; |
| 128 | |
| 129 | /* Short-cuts to get to dynamic linker sections. */ |
| 130 | asection *sdyntdata; |
| 131 | |
| 132 | /* Small local sym to section mapping cache. */ |
| 133 | struct sym_cache sym_cache; |
| 134 | }; |
| 135 | |
| 136 | |
| 137 | /* Get the RISC-V ELF linker hash table from a link_info structure. */ |
| 138 | #define riscv_elf_hash_table(p) \ |
| 139 | (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \ |
| 140 | == RISCV_ELF_DATA ? ((struct riscv_elf_link_hash_table *) ((p)->hash)) : NULL) |
| 141 | |
| 142 | static void |
| 143 | riscv_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED, |
| 144 | arelent *cache_ptr, |
| 145 | Elf_Internal_Rela *dst) |
| 146 | { |
| 147 | cache_ptr->howto = riscv_elf_rtype_to_howto (ELFNN_R_TYPE (dst->r_info)); |
| 148 | } |
| 149 | |
| 150 | static void |
| 151 | riscv_elf_append_rela (bfd *abfd, asection *s, Elf_Internal_Rela *rel) |
| 152 | { |
| 153 | const struct elf_backend_data *bed; |
| 154 | bfd_byte *loc; |
| 155 | |
| 156 | bed = get_elf_backend_data (abfd); |
| 157 | loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rela); |
| 158 | bed->s->swap_reloca_out (abfd, rel, loc); |
| 159 | } |
| 160 | |
| 161 | /* PLT/GOT stuff. */ |
| 162 | |
| 163 | #define PLT_HEADER_INSNS 8 |
| 164 | #define PLT_ENTRY_INSNS 4 |
| 165 | #define PLT_HEADER_SIZE (PLT_HEADER_INSNS * 4) |
| 166 | #define PLT_ENTRY_SIZE (PLT_ENTRY_INSNS * 4) |
| 167 | |
| 168 | #define GOT_ENTRY_SIZE RISCV_ELF_WORD_BYTES |
| 169 | |
| 170 | #define GOTPLT_HEADER_SIZE (2 * GOT_ENTRY_SIZE) |
| 171 | |
| 172 | #define sec_addr(sec) ((sec)->output_section->vma + (sec)->output_offset) |
| 173 | |
| 174 | static bfd_vma |
| 175 | riscv_elf_got_plt_val (bfd_vma plt_index, struct bfd_link_info *info) |
| 176 | { |
| 177 | return sec_addr (riscv_elf_hash_table (info)->elf.sgotplt) |
| 178 | + GOTPLT_HEADER_SIZE + (plt_index * GOT_ENTRY_SIZE); |
| 179 | } |
| 180 | |
| 181 | #if ARCH_SIZE == 32 |
| 182 | # define MATCH_LREG MATCH_LW |
| 183 | #else |
| 184 | # define MATCH_LREG MATCH_LD |
| 185 | #endif |
| 186 | |
| 187 | /* Generate a PLT header. */ |
| 188 | |
| 189 | static void |
| 190 | riscv_make_plt_header (bfd_vma gotplt_addr, bfd_vma addr, uint32_t *entry) |
| 191 | { |
| 192 | bfd_vma gotplt_offset_high = RISCV_PCREL_HIGH_PART (gotplt_addr, addr); |
| 193 | bfd_vma gotplt_offset_low = RISCV_PCREL_LOW_PART (gotplt_addr, addr); |
| 194 | |
| 195 | /* auipc t2, %hi(.got.plt) |
| 196 | sub t1, t1, t3 # shifted .got.plt offset + hdr size + 12 |
| 197 | l[w|d] t3, %lo(.got.plt)(t2) # _dl_runtime_resolve |
| 198 | addi t1, t1, -(hdr size + 12) # shifted .got.plt offset |
| 199 | addi t0, t2, %lo(.got.plt) # &.got.plt |
| 200 | srli t1, t1, log2(16/PTRSIZE) # .got.plt offset |
| 201 | l[w|d] t0, PTRSIZE(t0) # link map |
| 202 | jr t3 */ |
| 203 | |
| 204 | entry[0] = RISCV_UTYPE (AUIPC, X_T2, gotplt_offset_high); |
| 205 | entry[1] = RISCV_RTYPE (SUB, X_T1, X_T1, X_T3); |
| 206 | entry[2] = RISCV_ITYPE (LREG, X_T3, X_T2, gotplt_offset_low); |
| 207 | entry[3] = RISCV_ITYPE (ADDI, X_T1, X_T1, -(PLT_HEADER_SIZE + 12)); |
| 208 | entry[4] = RISCV_ITYPE (ADDI, X_T0, X_T2, gotplt_offset_low); |
| 209 | entry[5] = RISCV_ITYPE (SRLI, X_T1, X_T1, 4 - RISCV_ELF_LOG_WORD_BYTES); |
| 210 | entry[6] = RISCV_ITYPE (LREG, X_T0, X_T0, RISCV_ELF_WORD_BYTES); |
| 211 | entry[7] = RISCV_ITYPE (JALR, 0, X_T3, 0); |
| 212 | } |
| 213 | |
| 214 | /* Generate a PLT entry. */ |
| 215 | |
| 216 | static void |
| 217 | riscv_make_plt_entry (bfd_vma got, bfd_vma addr, uint32_t *entry) |
| 218 | { |
| 219 | /* auipc t3, %hi(.got.plt entry) |
| 220 | l[w|d] t3, %lo(.got.plt entry)(t3) |
| 221 | jalr t1, t3 |
| 222 | nop */ |
| 223 | |
| 224 | entry[0] = RISCV_UTYPE (AUIPC, X_T3, RISCV_PCREL_HIGH_PART (got, addr)); |
| 225 | entry[1] = RISCV_ITYPE (LREG, X_T3, X_T3, RISCV_PCREL_LOW_PART (got, addr)); |
| 226 | entry[2] = RISCV_ITYPE (JALR, X_T1, X_T3, 0); |
| 227 | entry[3] = RISCV_NOP; |
| 228 | } |
| 229 | |
| 230 | /* Create an entry in an RISC-V ELF linker hash table. */ |
| 231 | |
| 232 | static struct bfd_hash_entry * |
| 233 | link_hash_newfunc (struct bfd_hash_entry *entry, |
| 234 | struct bfd_hash_table *table, const char *string) |
| 235 | { |
| 236 | /* Allocate the structure if it has not already been allocated by a |
| 237 | subclass. */ |
| 238 | if (entry == NULL) |
| 239 | { |
| 240 | entry = |
| 241 | bfd_hash_allocate (table, |
| 242 | sizeof (struct riscv_elf_link_hash_entry)); |
| 243 | if (entry == NULL) |
| 244 | return entry; |
| 245 | } |
| 246 | |
| 247 | /* Call the allocation method of the superclass. */ |
| 248 | entry = _bfd_elf_link_hash_newfunc (entry, table, string); |
| 249 | if (entry != NULL) |
| 250 | { |
| 251 | struct riscv_elf_link_hash_entry *eh; |
| 252 | |
| 253 | eh = (struct riscv_elf_link_hash_entry *) entry; |
| 254 | eh->dyn_relocs = NULL; |
| 255 | eh->tls_type = GOT_UNKNOWN; |
| 256 | } |
| 257 | |
| 258 | return entry; |
| 259 | } |
| 260 | |
| 261 | /* Create a RISC-V ELF linker hash table. */ |
| 262 | |
| 263 | static struct bfd_link_hash_table * |
| 264 | riscv_elf_link_hash_table_create (bfd *abfd) |
| 265 | { |
| 266 | struct riscv_elf_link_hash_table *ret; |
| 267 | bfd_size_type amt = sizeof (struct riscv_elf_link_hash_table); |
| 268 | |
| 269 | ret = (struct riscv_elf_link_hash_table *) bfd_zmalloc (amt); |
| 270 | if (ret == NULL) |
| 271 | return NULL; |
| 272 | |
| 273 | if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc, |
| 274 | sizeof (struct riscv_elf_link_hash_entry), |
| 275 | RISCV_ELF_DATA)) |
| 276 | { |
| 277 | free (ret); |
| 278 | return NULL; |
| 279 | } |
| 280 | |
| 281 | return &ret->elf.root; |
| 282 | } |
| 283 | |
| 284 | /* Create the .got section. */ |
| 285 | |
| 286 | static bfd_boolean |
| 287 | riscv_elf_create_got_section (bfd *abfd, struct bfd_link_info *info) |
| 288 | { |
| 289 | flagword flags; |
| 290 | asection *s, *s_got; |
| 291 | struct elf_link_hash_entry *h; |
| 292 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 293 | struct elf_link_hash_table *htab = elf_hash_table (info); |
| 294 | |
| 295 | /* This function may be called more than once. */ |
| 296 | if (htab->sgot != NULL) |
| 297 | return TRUE; |
| 298 | |
| 299 | flags = bed->dynamic_sec_flags; |
| 300 | |
| 301 | s = bfd_make_section_anyway_with_flags (abfd, |
| 302 | (bed->rela_plts_and_copies_p |
| 303 | ? ".rela.got" : ".rel.got"), |
| 304 | (bed->dynamic_sec_flags |
| 305 | | SEC_READONLY)); |
| 306 | if (s == NULL |
| 307 | || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) |
| 308 | return FALSE; |
| 309 | htab->srelgot = s; |
| 310 | |
| 311 | s = s_got = bfd_make_section_anyway_with_flags (abfd, ".got", flags); |
| 312 | if (s == NULL |
| 313 | || !bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) |
| 314 | return FALSE; |
| 315 | htab->sgot = s; |
| 316 | |
| 317 | /* The first bit of the global offset table is the header. */ |
| 318 | s->size += bed->got_header_size; |
| 319 | |
| 320 | if (bed->want_got_plt) |
| 321 | { |
| 322 | s = bfd_make_section_anyway_with_flags (abfd, ".got.plt", flags); |
| 323 | if (s == NULL |
| 324 | || !bfd_set_section_alignment (abfd, s, |
| 325 | bed->s->log_file_align)) |
| 326 | return FALSE; |
| 327 | htab->sgotplt = s; |
| 328 | |
| 329 | /* Reserve room for the header. */ |
| 330 | s->size += GOTPLT_HEADER_SIZE; |
| 331 | } |
| 332 | |
| 333 | if (bed->want_got_sym) |
| 334 | { |
| 335 | /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got |
| 336 | section. We don't do this in the linker script because we don't want |
| 337 | to define the symbol if we are not creating a global offset |
| 338 | table. */ |
| 339 | h = _bfd_elf_define_linkage_sym (abfd, info, s_got, |
| 340 | "_GLOBAL_OFFSET_TABLE_"); |
| 341 | elf_hash_table (info)->hgot = h; |
| 342 | if (h == NULL) |
| 343 | return FALSE; |
| 344 | } |
| 345 | |
| 346 | return TRUE; |
| 347 | } |
| 348 | |
| 349 | /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and |
| 350 | .rela.bss sections in DYNOBJ, and set up shortcuts to them in our |
| 351 | hash table. */ |
| 352 | |
| 353 | static bfd_boolean |
| 354 | riscv_elf_create_dynamic_sections (bfd *dynobj, |
| 355 | struct bfd_link_info *info) |
| 356 | { |
| 357 | struct riscv_elf_link_hash_table *htab; |
| 358 | |
| 359 | htab = riscv_elf_hash_table (info); |
| 360 | BFD_ASSERT (htab != NULL); |
| 361 | |
| 362 | if (!riscv_elf_create_got_section (dynobj, info)) |
| 363 | return FALSE; |
| 364 | |
| 365 | if (!_bfd_elf_create_dynamic_sections (dynobj, info)) |
| 366 | return FALSE; |
| 367 | |
| 368 | if (!bfd_link_pic (info)) |
| 369 | { |
| 370 | htab->sdyntdata = |
| 371 | bfd_make_section_anyway_with_flags (dynobj, ".tdata.dyn", |
| 372 | SEC_ALLOC | SEC_THREAD_LOCAL); |
| 373 | } |
| 374 | |
| 375 | if (!htab->elf.splt || !htab->elf.srelplt || !htab->elf.sdynbss |
| 376 | || (!bfd_link_pic (info) && (!htab->elf.srelbss || !htab->sdyntdata))) |
| 377 | abort (); |
| 378 | |
| 379 | return TRUE; |
| 380 | } |
| 381 | |
| 382 | /* Copy the extra info we tack onto an elf_link_hash_entry. */ |
| 383 | |
| 384 | static void |
| 385 | riscv_elf_copy_indirect_symbol (struct bfd_link_info *info, |
| 386 | struct elf_link_hash_entry *dir, |
| 387 | struct elf_link_hash_entry *ind) |
| 388 | { |
| 389 | struct riscv_elf_link_hash_entry *edir, *eind; |
| 390 | |
| 391 | edir = (struct riscv_elf_link_hash_entry *) dir; |
| 392 | eind = (struct riscv_elf_link_hash_entry *) ind; |
| 393 | |
| 394 | if (eind->dyn_relocs != NULL) |
| 395 | { |
| 396 | if (edir->dyn_relocs != NULL) |
| 397 | { |
| 398 | struct riscv_elf_dyn_relocs **pp; |
| 399 | struct riscv_elf_dyn_relocs *p; |
| 400 | |
| 401 | /* Add reloc counts against the indirect sym to the direct sym |
| 402 | list. Merge any entries against the same section. */ |
| 403 | for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) |
| 404 | { |
| 405 | struct riscv_elf_dyn_relocs *q; |
| 406 | |
| 407 | for (q = edir->dyn_relocs; q != NULL; q = q->next) |
| 408 | if (q->sec == p->sec) |
| 409 | { |
| 410 | q->pc_count += p->pc_count; |
| 411 | q->count += p->count; |
| 412 | *pp = p->next; |
| 413 | break; |
| 414 | } |
| 415 | if (q == NULL) |
| 416 | pp = &p->next; |
| 417 | } |
| 418 | *pp = edir->dyn_relocs; |
| 419 | } |
| 420 | |
| 421 | edir->dyn_relocs = eind->dyn_relocs; |
| 422 | eind->dyn_relocs = NULL; |
| 423 | } |
| 424 | |
| 425 | if (ind->root.type == bfd_link_hash_indirect |
| 426 | && dir->got.refcount <= 0) |
| 427 | { |
| 428 | edir->tls_type = eind->tls_type; |
| 429 | eind->tls_type = GOT_UNKNOWN; |
| 430 | } |
| 431 | _bfd_elf_link_hash_copy_indirect (info, dir, ind); |
| 432 | } |
| 433 | |
| 434 | static bfd_boolean |
| 435 | riscv_elf_record_tls_type (bfd *abfd, struct elf_link_hash_entry *h, |
| 436 | unsigned long symndx, char tls_type) |
| 437 | { |
| 438 | char *new_tls_type = &_bfd_riscv_elf_tls_type (abfd, h, symndx); |
| 439 | |
| 440 | *new_tls_type |= tls_type; |
| 441 | if ((*new_tls_type & GOT_NORMAL) && (*new_tls_type & ~GOT_NORMAL)) |
| 442 | { |
| 443 | (*_bfd_error_handler) |
| 444 | (_("%B: `%s' accessed both as normal and thread local symbol"), |
| 445 | abfd, h ? h->root.root.string : "<local>"); |
| 446 | return FALSE; |
| 447 | } |
| 448 | return TRUE; |
| 449 | } |
| 450 | |
| 451 | static bfd_boolean |
| 452 | riscv_elf_record_got_reference (bfd *abfd, struct bfd_link_info *info, |
| 453 | struct elf_link_hash_entry *h, long symndx) |
| 454 | { |
| 455 | struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info); |
| 456 | Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 457 | |
| 458 | if (htab->elf.sgot == NULL) |
| 459 | { |
| 460 | if (!riscv_elf_create_got_section (htab->elf.dynobj, info)) |
| 461 | return FALSE; |
| 462 | } |
| 463 | |
| 464 | if (h != NULL) |
| 465 | { |
| 466 | h->got.refcount += 1; |
| 467 | return TRUE; |
| 468 | } |
| 469 | |
| 470 | /* This is a global offset table entry for a local symbol. */ |
| 471 | if (elf_local_got_refcounts (abfd) == NULL) |
| 472 | { |
| 473 | bfd_size_type size = symtab_hdr->sh_info * (sizeof (bfd_vma) + 1); |
| 474 | if (!(elf_local_got_refcounts (abfd) = bfd_zalloc (abfd, size))) |
| 475 | return FALSE; |
| 476 | _bfd_riscv_elf_local_got_tls_type (abfd) |
| 477 | = (char *) (elf_local_got_refcounts (abfd) + symtab_hdr->sh_info); |
| 478 | } |
| 479 | elf_local_got_refcounts (abfd) [symndx] += 1; |
| 480 | |
| 481 | return TRUE; |
| 482 | } |
| 483 | |
| 484 | static bfd_boolean |
| 485 | bad_static_reloc (bfd *abfd, unsigned r_type, struct elf_link_hash_entry *h) |
| 486 | { |
| 487 | (*_bfd_error_handler) |
| 488 | (_("%B: relocation %s against `%s' can not be used when making a shared " |
| 489 | "object; recompile with -fPIC"), |
| 490 | abfd, riscv_elf_rtype_to_howto (r_type)->name, |
| 491 | h != NULL ? h->root.root.string : "a local symbol"); |
| 492 | bfd_set_error (bfd_error_bad_value); |
| 493 | return FALSE; |
| 494 | } |
| 495 | /* Look through the relocs for a section during the first phase, and |
| 496 | allocate space in the global offset table or procedure linkage |
| 497 | table. */ |
| 498 | |
| 499 | static bfd_boolean |
| 500 | riscv_elf_check_relocs (bfd *abfd, struct bfd_link_info *info, |
| 501 | asection *sec, const Elf_Internal_Rela *relocs) |
| 502 | { |
| 503 | struct riscv_elf_link_hash_table *htab; |
| 504 | Elf_Internal_Shdr *symtab_hdr; |
| 505 | struct elf_link_hash_entry **sym_hashes; |
| 506 | const Elf_Internal_Rela *rel; |
| 507 | asection *sreloc = NULL; |
| 508 | |
| 509 | if (bfd_link_relocatable (info)) |
| 510 | return TRUE; |
| 511 | |
| 512 | htab = riscv_elf_hash_table (info); |
| 513 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 514 | sym_hashes = elf_sym_hashes (abfd); |
| 515 | |
| 516 | if (htab->elf.dynobj == NULL) |
| 517 | htab->elf.dynobj = abfd; |
| 518 | |
| 519 | for (rel = relocs; rel < relocs + sec->reloc_count; rel++) |
| 520 | { |
| 521 | unsigned int r_type; |
| 522 | unsigned long r_symndx; |
| 523 | struct elf_link_hash_entry *h; |
| 524 | |
| 525 | r_symndx = ELFNN_R_SYM (rel->r_info); |
| 526 | r_type = ELFNN_R_TYPE (rel->r_info); |
| 527 | |
| 528 | if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) |
| 529 | { |
| 530 | (*_bfd_error_handler) (_("%B: bad symbol index: %d"), |
| 531 | abfd, r_symndx); |
| 532 | return FALSE; |
| 533 | } |
| 534 | |
| 535 | if (r_symndx < symtab_hdr->sh_info) |
| 536 | h = NULL; |
| 537 | else |
| 538 | { |
| 539 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 540 | while (h->root.type == bfd_link_hash_indirect |
| 541 | || h->root.type == bfd_link_hash_warning) |
| 542 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 543 | |
| 544 | /* PR15323, ref flags aren't set for references in the same |
| 545 | object. */ |
| 546 | h->root.non_ir_ref = 1; |
| 547 | } |
| 548 | |
| 549 | switch (r_type) |
| 550 | { |
| 551 | case R_RISCV_TLS_GD_HI20: |
| 552 | if (!riscv_elf_record_got_reference (abfd, info, h, r_symndx) |
| 553 | || !riscv_elf_record_tls_type (abfd, h, r_symndx, GOT_TLS_GD)) |
| 554 | return FALSE; |
| 555 | break; |
| 556 | |
| 557 | case R_RISCV_TLS_GOT_HI20: |
| 558 | if (bfd_link_pic (info)) |
| 559 | info->flags |= DF_STATIC_TLS; |
| 560 | if (!riscv_elf_record_got_reference (abfd, info, h, r_symndx) |
| 561 | || !riscv_elf_record_tls_type (abfd, h, r_symndx, GOT_TLS_IE)) |
| 562 | return FALSE; |
| 563 | break; |
| 564 | |
| 565 | case R_RISCV_GOT_HI20: |
| 566 | if (!riscv_elf_record_got_reference (abfd, info, h, r_symndx) |
| 567 | || !riscv_elf_record_tls_type (abfd, h, r_symndx, GOT_NORMAL)) |
| 568 | return FALSE; |
| 569 | break; |
| 570 | |
| 571 | case R_RISCV_CALL_PLT: |
| 572 | /* This symbol requires a procedure linkage table entry. We |
| 573 | actually build the entry in adjust_dynamic_symbol, |
| 574 | because this might be a case of linking PIC code without |
| 575 | linking in any dynamic objects, in which case we don't |
| 576 | need to generate a procedure linkage table after all. */ |
| 577 | |
| 578 | if (h != NULL) |
| 579 | { |
| 580 | h->needs_plt = 1; |
| 581 | h->plt.refcount += 1; |
| 582 | } |
| 583 | break; |
| 584 | |
| 585 | case R_RISCV_CALL: |
| 586 | case R_RISCV_JAL: |
| 587 | case R_RISCV_BRANCH: |
| 588 | case R_RISCV_RVC_BRANCH: |
| 589 | case R_RISCV_RVC_JUMP: |
| 590 | case R_RISCV_PCREL_HI20: |
| 591 | /* In shared libraries, these relocs are known to bind locally. */ |
| 592 | if (bfd_link_pic (info)) |
| 593 | break; |
| 594 | goto static_reloc; |
| 595 | |
| 596 | case R_RISCV_TPREL_HI20: |
| 597 | if (!bfd_link_executable (info)) |
| 598 | return bad_static_reloc (abfd, r_type, h); |
| 599 | if (h != NULL) |
| 600 | riscv_elf_record_tls_type (abfd, h, r_symndx, GOT_TLS_LE); |
| 601 | goto static_reloc; |
| 602 | |
| 603 | case R_RISCV_HI20: |
| 604 | if (bfd_link_pic (info)) |
| 605 | return bad_static_reloc (abfd, r_type, h); |
| 606 | /* Fall through. */ |
| 607 | |
| 608 | case R_RISCV_COPY: |
| 609 | case R_RISCV_JUMP_SLOT: |
| 610 | case R_RISCV_RELATIVE: |
| 611 | case R_RISCV_64: |
| 612 | case R_RISCV_32: |
| 613 | /* Fall through. */ |
| 614 | |
| 615 | static_reloc: |
| 616 | /* This reloc might not bind locally. */ |
| 617 | if (h != NULL) |
| 618 | h->non_got_ref = 1; |
| 619 | |
| 620 | if (h != NULL && !bfd_link_pic (info)) |
| 621 | { |
| 622 | /* We may need a .plt entry if the function this reloc |
| 623 | refers to is in a shared lib. */ |
| 624 | h->plt.refcount += 1; |
| 625 | } |
| 626 | |
| 627 | /* If we are creating a shared library, and this is a reloc |
| 628 | against a global symbol, or a non PC relative reloc |
| 629 | against a local symbol, then we need to copy the reloc |
| 630 | into the shared library. However, if we are linking with |
| 631 | -Bsymbolic, we do not need to copy a reloc against a |
| 632 | global symbol which is defined in an object we are |
| 633 | including in the link (i.e., DEF_REGULAR is set). At |
| 634 | this point we have not seen all the input files, so it is |
| 635 | possible that DEF_REGULAR is not set now but will be set |
| 636 | later (it is never cleared). In case of a weak definition, |
| 637 | DEF_REGULAR may be cleared later by a strong definition in |
| 638 | a shared library. We account for that possibility below by |
| 639 | storing information in the relocs_copied field of the hash |
| 640 | table entry. A similar situation occurs when creating |
| 641 | shared libraries and symbol visibility changes render the |
| 642 | symbol local. |
| 643 | |
| 644 | If on the other hand, we are creating an executable, we |
| 645 | may need to keep relocations for symbols satisfied by a |
| 646 | dynamic library if we manage to avoid copy relocs for the |
| 647 | symbol. */ |
| 648 | if ((bfd_link_pic (info) |
| 649 | && (sec->flags & SEC_ALLOC) != 0 |
| 650 | && (! riscv_elf_rtype_to_howto (r_type)->pc_relative |
| 651 | || (h != NULL |
| 652 | && (! info->symbolic |
| 653 | || h->root.type == bfd_link_hash_defweak |
| 654 | || !h->def_regular)))) |
| 655 | || (!bfd_link_pic (info) |
| 656 | && (sec->flags & SEC_ALLOC) != 0 |
| 657 | && h != NULL |
| 658 | && (h->root.type == bfd_link_hash_defweak |
| 659 | || !h->def_regular))) |
| 660 | { |
| 661 | struct riscv_elf_dyn_relocs *p; |
| 662 | struct riscv_elf_dyn_relocs **head; |
| 663 | |
| 664 | /* When creating a shared object, we must copy these |
| 665 | relocs into the output file. We create a reloc |
| 666 | section in dynobj and make room for the reloc. */ |
| 667 | if (sreloc == NULL) |
| 668 | { |
| 669 | sreloc = _bfd_elf_make_dynamic_reloc_section |
| 670 | (sec, htab->elf.dynobj, RISCV_ELF_LOG_WORD_BYTES, |
| 671 | abfd, /*rela?*/ TRUE); |
| 672 | |
| 673 | if (sreloc == NULL) |
| 674 | return FALSE; |
| 675 | } |
| 676 | |
| 677 | /* If this is a global symbol, we count the number of |
| 678 | relocations we need for this symbol. */ |
| 679 | if (h != NULL) |
| 680 | head = &((struct riscv_elf_link_hash_entry *) h)->dyn_relocs; |
| 681 | else |
| 682 | { |
| 683 | /* Track dynamic relocs needed for local syms too. |
| 684 | We really need local syms available to do this |
| 685 | easily. Oh well. */ |
| 686 | |
| 687 | asection *s; |
| 688 | void *vpp; |
| 689 | Elf_Internal_Sym *isym; |
| 690 | |
| 691 | isym = bfd_sym_from_r_symndx (&htab->sym_cache, |
| 692 | abfd, r_symndx); |
| 693 | if (isym == NULL) |
| 694 | return FALSE; |
| 695 | |
| 696 | s = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| 697 | if (s == NULL) |
| 698 | s = sec; |
| 699 | |
| 700 | vpp = &elf_section_data (s)->local_dynrel; |
| 701 | head = (struct riscv_elf_dyn_relocs **) vpp; |
| 702 | } |
| 703 | |
| 704 | p = *head; |
| 705 | if (p == NULL || p->sec != sec) |
| 706 | { |
| 707 | bfd_size_type amt = sizeof *p; |
| 708 | p = ((struct riscv_elf_dyn_relocs *) |
| 709 | bfd_alloc (htab->elf.dynobj, amt)); |
| 710 | if (p == NULL) |
| 711 | return FALSE; |
| 712 | p->next = *head; |
| 713 | *head = p; |
| 714 | p->sec = sec; |
| 715 | p->count = 0; |
| 716 | p->pc_count = 0; |
| 717 | } |
| 718 | |
| 719 | p->count += 1; |
| 720 | p->pc_count += riscv_elf_rtype_to_howto (r_type)->pc_relative; |
| 721 | } |
| 722 | |
| 723 | break; |
| 724 | |
| 725 | case R_RISCV_GNU_VTINHERIT: |
| 726 | if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) |
| 727 | return FALSE; |
| 728 | break; |
| 729 | |
| 730 | case R_RISCV_GNU_VTENTRY: |
| 731 | if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) |
| 732 | return FALSE; |
| 733 | break; |
| 734 | |
| 735 | default: |
| 736 | break; |
| 737 | } |
| 738 | } |
| 739 | |
| 740 | return TRUE; |
| 741 | } |
| 742 | |
| 743 | static asection * |
| 744 | riscv_elf_gc_mark_hook (asection *sec, |
| 745 | struct bfd_link_info *info, |
| 746 | Elf_Internal_Rela *rel, |
| 747 | struct elf_link_hash_entry *h, |
| 748 | Elf_Internal_Sym *sym) |
| 749 | { |
| 750 | if (h != NULL) |
| 751 | switch (ELFNN_R_TYPE (rel->r_info)) |
| 752 | { |
| 753 | case R_RISCV_GNU_VTINHERIT: |
| 754 | case R_RISCV_GNU_VTENTRY: |
| 755 | return NULL; |
| 756 | } |
| 757 | |
| 758 | return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); |
| 759 | } |
| 760 | |
| 761 | /* Update the got entry reference counts for the section being removed. */ |
| 762 | |
| 763 | static bfd_boolean |
| 764 | riscv_elf_gc_sweep_hook (bfd *abfd, |
| 765 | struct bfd_link_info *info, |
| 766 | asection *sec, |
| 767 | const Elf_Internal_Rela *relocs) |
| 768 | { |
| 769 | const Elf_Internal_Rela *rel, *relend; |
| 770 | Elf_Internal_Shdr *symtab_hdr = &elf_symtab_hdr (abfd); |
| 771 | struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (abfd); |
| 772 | bfd_signed_vma *local_got_refcounts = elf_local_got_refcounts (abfd); |
| 773 | |
| 774 | if (bfd_link_relocatable (info)) |
| 775 | return TRUE; |
| 776 | |
| 777 | elf_section_data (sec)->local_dynrel = NULL; |
| 778 | |
| 779 | for (rel = relocs, relend = relocs + sec->reloc_count; rel < relend; rel++) |
| 780 | { |
| 781 | unsigned long r_symndx; |
| 782 | struct elf_link_hash_entry *h = NULL; |
| 783 | |
| 784 | r_symndx = ELFNN_R_SYM (rel->r_info); |
| 785 | if (r_symndx >= symtab_hdr->sh_info) |
| 786 | { |
| 787 | struct riscv_elf_link_hash_entry *eh; |
| 788 | struct riscv_elf_dyn_relocs **pp; |
| 789 | struct riscv_elf_dyn_relocs *p; |
| 790 | |
| 791 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 792 | while (h->root.type == bfd_link_hash_indirect |
| 793 | || h->root.type == bfd_link_hash_warning) |
| 794 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 795 | eh = (struct riscv_elf_link_hash_entry *) h; |
| 796 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) |
| 797 | if (p->sec == sec) |
| 798 | { |
| 799 | /* Everything must go for SEC. */ |
| 800 | *pp = p->next; |
| 801 | break; |
| 802 | } |
| 803 | } |
| 804 | |
| 805 | switch (ELFNN_R_TYPE (rel->r_info)) |
| 806 | { |
| 807 | case R_RISCV_GOT_HI20: |
| 808 | case R_RISCV_TLS_GOT_HI20: |
| 809 | case R_RISCV_TLS_GD_HI20: |
| 810 | if (h != NULL) |
| 811 | { |
| 812 | if (h->got.refcount > 0) |
| 813 | h->got.refcount--; |
| 814 | } |
| 815 | else |
| 816 | { |
| 817 | if (local_got_refcounts && |
| 818 | local_got_refcounts[r_symndx] > 0) |
| 819 | local_got_refcounts[r_symndx]--; |
| 820 | } |
| 821 | break; |
| 822 | |
| 823 | case R_RISCV_HI20: |
| 824 | case R_RISCV_PCREL_HI20: |
| 825 | case R_RISCV_COPY: |
| 826 | case R_RISCV_JUMP_SLOT: |
| 827 | case R_RISCV_RELATIVE: |
| 828 | case R_RISCV_64: |
| 829 | case R_RISCV_32: |
| 830 | case R_RISCV_BRANCH: |
| 831 | case R_RISCV_CALL: |
| 832 | case R_RISCV_JAL: |
| 833 | case R_RISCV_RVC_BRANCH: |
| 834 | case R_RISCV_RVC_JUMP: |
| 835 | if (bfd_link_pic (info)) |
| 836 | break; |
| 837 | /* Fall through. */ |
| 838 | |
| 839 | case R_RISCV_CALL_PLT: |
| 840 | if (h != NULL) |
| 841 | { |
| 842 | if (h->plt.refcount > 0) |
| 843 | h->plt.refcount--; |
| 844 | } |
| 845 | break; |
| 846 | |
| 847 | default: |
| 848 | break; |
| 849 | } |
| 850 | } |
| 851 | |
| 852 | return TRUE; |
| 853 | } |
| 854 | |
| 855 | /* Adjust a symbol defined by a dynamic object and referenced by a |
| 856 | regular object. The current definition is in some section of the |
| 857 | dynamic object, but we're not including those sections. We have to |
| 858 | change the definition to something the rest of the link can |
| 859 | understand. */ |
| 860 | |
| 861 | static bfd_boolean |
| 862 | riscv_elf_adjust_dynamic_symbol (struct bfd_link_info *info, |
| 863 | struct elf_link_hash_entry *h) |
| 864 | { |
| 865 | struct riscv_elf_link_hash_table *htab; |
| 866 | struct riscv_elf_link_hash_entry * eh; |
| 867 | struct riscv_elf_dyn_relocs *p; |
| 868 | bfd *dynobj; |
| 869 | asection *s, *srel; |
| 870 | |
| 871 | htab = riscv_elf_hash_table (info); |
| 872 | BFD_ASSERT (htab != NULL); |
| 873 | |
| 874 | dynobj = htab->elf.dynobj; |
| 875 | |
| 876 | /* Make sure we know what is going on here. */ |
| 877 | BFD_ASSERT (dynobj != NULL |
| 878 | && (h->needs_plt |
| 879 | || h->type == STT_GNU_IFUNC |
| 880 | || h->u.weakdef != NULL |
| 881 | || (h->def_dynamic |
| 882 | && h->ref_regular |
| 883 | && !h->def_regular))); |
| 884 | |
| 885 | /* If this is a function, put it in the procedure linkage table. We |
| 886 | will fill in the contents of the procedure linkage table later |
| 887 | (although we could actually do it here). */ |
| 888 | if (h->type == STT_FUNC || h->type == STT_GNU_IFUNC || h->needs_plt) |
| 889 | { |
| 890 | if (h->plt.refcount <= 0 |
| 891 | || SYMBOL_CALLS_LOCAL (info, h) |
| 892 | || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT |
| 893 | && h->root.type == bfd_link_hash_undefweak)) |
| 894 | { |
| 895 | /* This case can occur if we saw a R_RISCV_CALL_PLT reloc in an |
| 896 | input file, but the symbol was never referred to by a dynamic |
| 897 | object, or if all references were garbage collected. In such |
| 898 | a case, we don't actually need to build a PLT entry. */ |
| 899 | h->plt.offset = (bfd_vma) -1; |
| 900 | h->needs_plt = 0; |
| 901 | } |
| 902 | |
| 903 | return TRUE; |
| 904 | } |
| 905 | else |
| 906 | h->plt.offset = (bfd_vma) -1; |
| 907 | |
| 908 | /* If this is a weak symbol, and there is a real definition, the |
| 909 | processor independent code will have arranged for us to see the |
| 910 | real definition first, and we can just use the same value. */ |
| 911 | if (h->u.weakdef != NULL) |
| 912 | { |
| 913 | BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined |
| 914 | || h->u.weakdef->root.type == bfd_link_hash_defweak); |
| 915 | h->root.u.def.section = h->u.weakdef->root.u.def.section; |
| 916 | h->root.u.def.value = h->u.weakdef->root.u.def.value; |
| 917 | return TRUE; |
| 918 | } |
| 919 | |
| 920 | /* This is a reference to a symbol defined by a dynamic object which |
| 921 | is not a function. */ |
| 922 | |
| 923 | /* If we are creating a shared library, we must presume that the |
| 924 | only references to the symbol are via the global offset table. |
| 925 | For such cases we need not do anything here; the relocations will |
| 926 | be handled correctly by relocate_section. */ |
| 927 | if (bfd_link_pic (info)) |
| 928 | return TRUE; |
| 929 | |
| 930 | /* If there are no references to this symbol that do not use the |
| 931 | GOT, we don't need to generate a copy reloc. */ |
| 932 | if (!h->non_got_ref) |
| 933 | return TRUE; |
| 934 | |
| 935 | /* If -z nocopyreloc was given, we won't generate them either. */ |
| 936 | if (info->nocopyreloc) |
| 937 | { |
| 938 | h->non_got_ref = 0; |
| 939 | return TRUE; |
| 940 | } |
| 941 | |
| 942 | eh = (struct riscv_elf_link_hash_entry *) h; |
| 943 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 944 | { |
| 945 | s = p->sec->output_section; |
| 946 | if (s != NULL && (s->flags & SEC_READONLY) != 0) |
| 947 | break; |
| 948 | } |
| 949 | |
| 950 | /* If we didn't find any dynamic relocs in read-only sections, then |
| 951 | we'll be keeping the dynamic relocs and avoiding the copy reloc. */ |
| 952 | if (p == NULL) |
| 953 | { |
| 954 | h->non_got_ref = 0; |
| 955 | return TRUE; |
| 956 | } |
| 957 | |
| 958 | /* We must allocate the symbol in our .dynbss section, which will |
| 959 | become part of the .bss section of the executable. There will be |
| 960 | an entry for this symbol in the .dynsym section. The dynamic |
| 961 | object will contain position independent code, so all references |
| 962 | from the dynamic object to this symbol will go through the global |
| 963 | offset table. The dynamic linker will use the .dynsym entry to |
| 964 | determine the address it must put in the global offset table, so |
| 965 | both the dynamic object and the regular object will refer to the |
| 966 | same memory location for the variable. */ |
| 967 | |
| 968 | /* We must generate a R_RISCV_COPY reloc to tell the dynamic linker |
| 969 | to copy the initial value out of the dynamic object and into the |
| 970 | runtime process image. We need to remember the offset into the |
| 971 | .rel.bss section we are going to use. */ |
| 972 | if ((h->root.u.def.section->flags & SEC_READONLY) != 0) |
| 973 | { |
| 974 | s = htab->elf.sdynrelro; |
| 975 | srel = htab->elf.sreldynrelro; |
| 976 | } |
| 977 | else |
| 978 | { |
| 979 | s = htab->elf.sdynbss; |
| 980 | srel = htab->elf.srelbss; |
| 981 | } |
| 982 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) |
| 983 | { |
| 984 | srel->size += sizeof (ElfNN_External_Rela); |
| 985 | h->needs_copy = 1; |
| 986 | } |
| 987 | |
| 988 | if (eh->tls_type & ~GOT_NORMAL) |
| 989 | return _bfd_elf_adjust_dynamic_copy (info, h, htab->sdyntdata); |
| 990 | |
| 991 | return _bfd_elf_adjust_dynamic_copy (info, h, s); |
| 992 | } |
| 993 | |
| 994 | /* Allocate space in .plt, .got and associated reloc sections for |
| 995 | dynamic relocs. */ |
| 996 | |
| 997 | static bfd_boolean |
| 998 | allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) |
| 999 | { |
| 1000 | struct bfd_link_info *info; |
| 1001 | struct riscv_elf_link_hash_table *htab; |
| 1002 | struct riscv_elf_link_hash_entry *eh; |
| 1003 | struct riscv_elf_dyn_relocs *p; |
| 1004 | |
| 1005 | if (h->root.type == bfd_link_hash_indirect) |
| 1006 | return TRUE; |
| 1007 | |
| 1008 | info = (struct bfd_link_info *) inf; |
| 1009 | htab = riscv_elf_hash_table (info); |
| 1010 | BFD_ASSERT (htab != NULL); |
| 1011 | |
| 1012 | if (htab->elf.dynamic_sections_created |
| 1013 | && h->plt.refcount > 0) |
| 1014 | { |
| 1015 | /* Make sure this symbol is output as a dynamic symbol. |
| 1016 | Undefined weak syms won't yet be marked as dynamic. */ |
| 1017 | if (h->dynindx == -1 |
| 1018 | && !h->forced_local) |
| 1019 | { |
| 1020 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 1021 | return FALSE; |
| 1022 | } |
| 1023 | |
| 1024 | if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, bfd_link_pic (info), h)) |
| 1025 | { |
| 1026 | asection *s = htab->elf.splt; |
| 1027 | |
| 1028 | if (s->size == 0) |
| 1029 | s->size = PLT_HEADER_SIZE; |
| 1030 | |
| 1031 | h->plt.offset = s->size; |
| 1032 | |
| 1033 | /* Make room for this entry. */ |
| 1034 | s->size += PLT_ENTRY_SIZE; |
| 1035 | |
| 1036 | /* We also need to make an entry in the .got.plt section. */ |
| 1037 | htab->elf.sgotplt->size += GOT_ENTRY_SIZE; |
| 1038 | |
| 1039 | /* We also need to make an entry in the .rela.plt section. */ |
| 1040 | htab->elf.srelplt->size += sizeof (ElfNN_External_Rela); |
| 1041 | |
| 1042 | /* If this symbol is not defined in a regular file, and we are |
| 1043 | not generating a shared library, then set the symbol to this |
| 1044 | location in the .plt. This is required to make function |
| 1045 | pointers compare as equal between the normal executable and |
| 1046 | the shared library. */ |
| 1047 | if (! bfd_link_pic (info) |
| 1048 | && !h->def_regular) |
| 1049 | { |
| 1050 | h->root.u.def.section = s; |
| 1051 | h->root.u.def.value = h->plt.offset; |
| 1052 | } |
| 1053 | } |
| 1054 | else |
| 1055 | { |
| 1056 | h->plt.offset = (bfd_vma) -1; |
| 1057 | h->needs_plt = 0; |
| 1058 | } |
| 1059 | } |
| 1060 | else |
| 1061 | { |
| 1062 | h->plt.offset = (bfd_vma) -1; |
| 1063 | h->needs_plt = 0; |
| 1064 | } |
| 1065 | |
| 1066 | if (h->got.refcount > 0) |
| 1067 | { |
| 1068 | asection *s; |
| 1069 | bfd_boolean dyn; |
| 1070 | int tls_type = riscv_elf_hash_entry (h)->tls_type; |
| 1071 | |
| 1072 | /* Make sure this symbol is output as a dynamic symbol. |
| 1073 | Undefined weak syms won't yet be marked as dynamic. */ |
| 1074 | if (h->dynindx == -1 |
| 1075 | && !h->forced_local) |
| 1076 | { |
| 1077 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 1078 | return FALSE; |
| 1079 | } |
| 1080 | |
| 1081 | s = htab->elf.sgot; |
| 1082 | h->got.offset = s->size; |
| 1083 | dyn = htab->elf.dynamic_sections_created; |
| 1084 | if (tls_type & (GOT_TLS_GD | GOT_TLS_IE)) |
| 1085 | { |
| 1086 | /* TLS_GD needs two dynamic relocs and two GOT slots. */ |
| 1087 | if (tls_type & GOT_TLS_GD) |
| 1088 | { |
| 1089 | s->size += 2 * RISCV_ELF_WORD_BYTES; |
| 1090 | htab->elf.srelgot->size += 2 * sizeof (ElfNN_External_Rela); |
| 1091 | } |
| 1092 | |
| 1093 | /* TLS_IE needs one dynamic reloc and one GOT slot. */ |
| 1094 | if (tls_type & GOT_TLS_IE) |
| 1095 | { |
| 1096 | s->size += RISCV_ELF_WORD_BYTES; |
| 1097 | htab->elf.srelgot->size += sizeof (ElfNN_External_Rela); |
| 1098 | } |
| 1099 | } |
| 1100 | else |
| 1101 | { |
| 1102 | s->size += RISCV_ELF_WORD_BYTES; |
| 1103 | if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, bfd_link_pic (info), h)) |
| 1104 | htab->elf.srelgot->size += sizeof (ElfNN_External_Rela); |
| 1105 | } |
| 1106 | } |
| 1107 | else |
| 1108 | h->got.offset = (bfd_vma) -1; |
| 1109 | |
| 1110 | eh = (struct riscv_elf_link_hash_entry *) h; |
| 1111 | if (eh->dyn_relocs == NULL) |
| 1112 | return TRUE; |
| 1113 | |
| 1114 | /* In the shared -Bsymbolic case, discard space allocated for |
| 1115 | dynamic pc-relative relocs against symbols which turn out to be |
| 1116 | defined in regular objects. For the normal shared case, discard |
| 1117 | space for pc-relative relocs that have become local due to symbol |
| 1118 | visibility changes. */ |
| 1119 | |
| 1120 | if (bfd_link_pic (info)) |
| 1121 | { |
| 1122 | if (SYMBOL_CALLS_LOCAL (info, h)) |
| 1123 | { |
| 1124 | struct riscv_elf_dyn_relocs **pp; |
| 1125 | |
| 1126 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) |
| 1127 | { |
| 1128 | p->count -= p->pc_count; |
| 1129 | p->pc_count = 0; |
| 1130 | if (p->count == 0) |
| 1131 | *pp = p->next; |
| 1132 | else |
| 1133 | pp = &p->next; |
| 1134 | } |
| 1135 | } |
| 1136 | |
| 1137 | /* Also discard relocs on undefined weak syms with non-default |
| 1138 | visibility. */ |
| 1139 | if (eh->dyn_relocs != NULL |
| 1140 | && h->root.type == bfd_link_hash_undefweak) |
| 1141 | { |
| 1142 | if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) |
| 1143 | eh->dyn_relocs = NULL; |
| 1144 | |
| 1145 | /* Make sure undefined weak symbols are output as a dynamic |
| 1146 | symbol in PIEs. */ |
| 1147 | else if (h->dynindx == -1 |
| 1148 | && !h->forced_local) |
| 1149 | { |
| 1150 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 1151 | return FALSE; |
| 1152 | } |
| 1153 | } |
| 1154 | } |
| 1155 | else |
| 1156 | { |
| 1157 | /* For the non-shared case, discard space for relocs against |
| 1158 | symbols which turn out to need copy relocs or are not |
| 1159 | dynamic. */ |
| 1160 | |
| 1161 | if (!h->non_got_ref |
| 1162 | && ((h->def_dynamic |
| 1163 | && !h->def_regular) |
| 1164 | || (htab->elf.dynamic_sections_created |
| 1165 | && (h->root.type == bfd_link_hash_undefweak |
| 1166 | || h->root.type == bfd_link_hash_undefined)))) |
| 1167 | { |
| 1168 | /* Make sure this symbol is output as a dynamic symbol. |
| 1169 | Undefined weak syms won't yet be marked as dynamic. */ |
| 1170 | if (h->dynindx == -1 |
| 1171 | && !h->forced_local) |
| 1172 | { |
| 1173 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 1174 | return FALSE; |
| 1175 | } |
| 1176 | |
| 1177 | /* If that succeeded, we know we'll be keeping all the |
| 1178 | relocs. */ |
| 1179 | if (h->dynindx != -1) |
| 1180 | goto keep; |
| 1181 | } |
| 1182 | |
| 1183 | eh->dyn_relocs = NULL; |
| 1184 | |
| 1185 | keep: ; |
| 1186 | } |
| 1187 | |
| 1188 | /* Finally, allocate space. */ |
| 1189 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 1190 | { |
| 1191 | asection *sreloc = elf_section_data (p->sec)->sreloc; |
| 1192 | sreloc->size += p->count * sizeof (ElfNN_External_Rela); |
| 1193 | } |
| 1194 | |
| 1195 | return TRUE; |
| 1196 | } |
| 1197 | |
| 1198 | /* Find any dynamic relocs that apply to read-only sections. */ |
| 1199 | |
| 1200 | static bfd_boolean |
| 1201 | readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf) |
| 1202 | { |
| 1203 | struct riscv_elf_link_hash_entry *eh; |
| 1204 | struct riscv_elf_dyn_relocs *p; |
| 1205 | |
| 1206 | eh = (struct riscv_elf_link_hash_entry *) h; |
| 1207 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 1208 | { |
| 1209 | asection *s = p->sec->output_section; |
| 1210 | |
| 1211 | if (s != NULL && (s->flags & SEC_READONLY) != 0) |
| 1212 | { |
| 1213 | ((struct bfd_link_info *) inf)->flags |= DF_TEXTREL; |
| 1214 | return FALSE; |
| 1215 | } |
| 1216 | } |
| 1217 | return TRUE; |
| 1218 | } |
| 1219 | |
| 1220 | static bfd_boolean |
| 1221 | riscv_elf_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) |
| 1222 | { |
| 1223 | struct riscv_elf_link_hash_table *htab; |
| 1224 | bfd *dynobj; |
| 1225 | asection *s; |
| 1226 | bfd *ibfd; |
| 1227 | |
| 1228 | htab = riscv_elf_hash_table (info); |
| 1229 | BFD_ASSERT (htab != NULL); |
| 1230 | dynobj = htab->elf.dynobj; |
| 1231 | BFD_ASSERT (dynobj != NULL); |
| 1232 | |
| 1233 | if (elf_hash_table (info)->dynamic_sections_created) |
| 1234 | { |
| 1235 | /* Set the contents of the .interp section to the interpreter. */ |
| 1236 | if (bfd_link_executable (info) && !info->nointerp) |
| 1237 | { |
| 1238 | s = bfd_get_linker_section (dynobj, ".interp"); |
| 1239 | BFD_ASSERT (s != NULL); |
| 1240 | s->size = strlen (ELFNN_DYNAMIC_INTERPRETER) + 1; |
| 1241 | s->contents = (unsigned char *) ELFNN_DYNAMIC_INTERPRETER; |
| 1242 | } |
| 1243 | } |
| 1244 | |
| 1245 | /* Set up .got offsets for local syms, and space for local dynamic |
| 1246 | relocs. */ |
| 1247 | for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next) |
| 1248 | { |
| 1249 | bfd_signed_vma *local_got; |
| 1250 | bfd_signed_vma *end_local_got; |
| 1251 | char *local_tls_type; |
| 1252 | bfd_size_type locsymcount; |
| 1253 | Elf_Internal_Shdr *symtab_hdr; |
| 1254 | asection *srel; |
| 1255 | |
| 1256 | if (! is_riscv_elf (ibfd)) |
| 1257 | continue; |
| 1258 | |
| 1259 | for (s = ibfd->sections; s != NULL; s = s->next) |
| 1260 | { |
| 1261 | struct riscv_elf_dyn_relocs *p; |
| 1262 | |
| 1263 | for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next) |
| 1264 | { |
| 1265 | if (!bfd_is_abs_section (p->sec) |
| 1266 | && bfd_is_abs_section (p->sec->output_section)) |
| 1267 | { |
| 1268 | /* Input section has been discarded, either because |
| 1269 | it is a copy of a linkonce section or due to |
| 1270 | linker script /DISCARD/, so we'll be discarding |
| 1271 | the relocs too. */ |
| 1272 | } |
| 1273 | else if (p->count != 0) |
| 1274 | { |
| 1275 | srel = elf_section_data (p->sec)->sreloc; |
| 1276 | srel->size += p->count * sizeof (ElfNN_External_Rela); |
| 1277 | if ((p->sec->output_section->flags & SEC_READONLY) != 0) |
| 1278 | info->flags |= DF_TEXTREL; |
| 1279 | } |
| 1280 | } |
| 1281 | } |
| 1282 | |
| 1283 | local_got = elf_local_got_refcounts (ibfd); |
| 1284 | if (!local_got) |
| 1285 | continue; |
| 1286 | |
| 1287 | symtab_hdr = &elf_symtab_hdr (ibfd); |
| 1288 | locsymcount = symtab_hdr->sh_info; |
| 1289 | end_local_got = local_got + locsymcount; |
| 1290 | local_tls_type = _bfd_riscv_elf_local_got_tls_type (ibfd); |
| 1291 | s = htab->elf.sgot; |
| 1292 | srel = htab->elf.srelgot; |
| 1293 | for (; local_got < end_local_got; ++local_got, ++local_tls_type) |
| 1294 | { |
| 1295 | if (*local_got > 0) |
| 1296 | { |
| 1297 | *local_got = s->size; |
| 1298 | s->size += RISCV_ELF_WORD_BYTES; |
| 1299 | if (*local_tls_type & GOT_TLS_GD) |
| 1300 | s->size += RISCV_ELF_WORD_BYTES; |
| 1301 | if (bfd_link_pic (info) |
| 1302 | || (*local_tls_type & (GOT_TLS_GD | GOT_TLS_IE))) |
| 1303 | srel->size += sizeof (ElfNN_External_Rela); |
| 1304 | } |
| 1305 | else |
| 1306 | *local_got = (bfd_vma) -1; |
| 1307 | } |
| 1308 | } |
| 1309 | |
| 1310 | /* Allocate global sym .plt and .got entries, and space for global |
| 1311 | sym dynamic relocs. */ |
| 1312 | elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info); |
| 1313 | |
| 1314 | if (htab->elf.sgotplt) |
| 1315 | { |
| 1316 | struct elf_link_hash_entry *got; |
| 1317 | got = elf_link_hash_lookup (elf_hash_table (info), |
| 1318 | "_GLOBAL_OFFSET_TABLE_", |
| 1319 | FALSE, FALSE, FALSE); |
| 1320 | |
| 1321 | /* Don't allocate .got.plt section if there are no GOT nor PLT |
| 1322 | entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */ |
| 1323 | if ((got == NULL |
| 1324 | || !got->ref_regular_nonweak) |
| 1325 | && (htab->elf.sgotplt->size == GOTPLT_HEADER_SIZE) |
| 1326 | && (htab->elf.splt == NULL |
| 1327 | || htab->elf.splt->size == 0) |
| 1328 | && (htab->elf.sgot == NULL |
| 1329 | || (htab->elf.sgot->size |
| 1330 | == get_elf_backend_data (output_bfd)->got_header_size))) |
| 1331 | htab->elf.sgotplt->size = 0; |
| 1332 | } |
| 1333 | |
| 1334 | /* The check_relocs and adjust_dynamic_symbol entry points have |
| 1335 | determined the sizes of the various dynamic sections. Allocate |
| 1336 | memory for them. */ |
| 1337 | for (s = dynobj->sections; s != NULL; s = s->next) |
| 1338 | { |
| 1339 | if ((s->flags & SEC_LINKER_CREATED) == 0) |
| 1340 | continue; |
| 1341 | |
| 1342 | if (s == htab->elf.splt |
| 1343 | || s == htab->elf.sgot |
| 1344 | || s == htab->elf.sgotplt |
| 1345 | || s == htab->elf.sdynbss |
| 1346 | || s == htab->elf.sdynrelro) |
| 1347 | { |
| 1348 | /* Strip this section if we don't need it; see the |
| 1349 | comment below. */ |
| 1350 | } |
| 1351 | else if (strncmp (s->name, ".rela", 5) == 0) |
| 1352 | { |
| 1353 | if (s->size != 0) |
| 1354 | { |
| 1355 | /* We use the reloc_count field as a counter if we need |
| 1356 | to copy relocs into the output file. */ |
| 1357 | s->reloc_count = 0; |
| 1358 | } |
| 1359 | } |
| 1360 | else |
| 1361 | { |
| 1362 | /* It's not one of our sections. */ |
| 1363 | continue; |
| 1364 | } |
| 1365 | |
| 1366 | if (s->size == 0) |
| 1367 | { |
| 1368 | /* If we don't need this section, strip it from the |
| 1369 | output file. This is mostly to handle .rela.bss and |
| 1370 | .rela.plt. We must create both sections in |
| 1371 | create_dynamic_sections, because they must be created |
| 1372 | before the linker maps input sections to output |
| 1373 | sections. The linker does that before |
| 1374 | adjust_dynamic_symbol is called, and it is that |
| 1375 | function which decides whether anything needs to go |
| 1376 | into these sections. */ |
| 1377 | s->flags |= SEC_EXCLUDE; |
| 1378 | continue; |
| 1379 | } |
| 1380 | |
| 1381 | if ((s->flags & SEC_HAS_CONTENTS) == 0) |
| 1382 | continue; |
| 1383 | |
| 1384 | /* Allocate memory for the section contents. Zero the memory |
| 1385 | for the benefit of .rela.plt, which has 4 unused entries |
| 1386 | at the beginning, and we don't want garbage. */ |
| 1387 | s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); |
| 1388 | if (s->contents == NULL) |
| 1389 | return FALSE; |
| 1390 | } |
| 1391 | |
| 1392 | if (elf_hash_table (info)->dynamic_sections_created) |
| 1393 | { |
| 1394 | /* Add some entries to the .dynamic section. We fill in the |
| 1395 | values later, in riscv_elf_finish_dynamic_sections, but we |
| 1396 | must add the entries now so that we get the correct size for |
| 1397 | the .dynamic section. The DT_DEBUG entry is filled in by the |
| 1398 | dynamic linker and used by the debugger. */ |
| 1399 | #define add_dynamic_entry(TAG, VAL) \ |
| 1400 | _bfd_elf_add_dynamic_entry (info, TAG, VAL) |
| 1401 | |
| 1402 | if (bfd_link_executable (info)) |
| 1403 | { |
| 1404 | if (!add_dynamic_entry (DT_DEBUG, 0)) |
| 1405 | return FALSE; |
| 1406 | } |
| 1407 | |
| 1408 | if (htab->elf.srelplt->size != 0) |
| 1409 | { |
| 1410 | if (!add_dynamic_entry (DT_PLTGOT, 0) |
| 1411 | || !add_dynamic_entry (DT_PLTRELSZ, 0) |
| 1412 | || !add_dynamic_entry (DT_PLTREL, DT_RELA) |
| 1413 | || !add_dynamic_entry (DT_JMPREL, 0)) |
| 1414 | return FALSE; |
| 1415 | } |
| 1416 | |
| 1417 | if (!add_dynamic_entry (DT_RELA, 0) |
| 1418 | || !add_dynamic_entry (DT_RELASZ, 0) |
| 1419 | || !add_dynamic_entry (DT_RELAENT, sizeof (ElfNN_External_Rela))) |
| 1420 | return FALSE; |
| 1421 | |
| 1422 | /* If any dynamic relocs apply to a read-only section, |
| 1423 | then we need a DT_TEXTREL entry. */ |
| 1424 | if ((info->flags & DF_TEXTREL) == 0) |
| 1425 | elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, info); |
| 1426 | |
| 1427 | if (info->flags & DF_TEXTREL) |
| 1428 | { |
| 1429 | if (!add_dynamic_entry (DT_TEXTREL, 0)) |
| 1430 | return FALSE; |
| 1431 | } |
| 1432 | } |
| 1433 | #undef add_dynamic_entry |
| 1434 | |
| 1435 | return TRUE; |
| 1436 | } |
| 1437 | |
| 1438 | #define TP_OFFSET 0 |
| 1439 | #define DTP_OFFSET 0x800 |
| 1440 | |
| 1441 | /* Return the relocation value for a TLS dtp-relative reloc. */ |
| 1442 | |
| 1443 | static bfd_vma |
| 1444 | dtpoff (struct bfd_link_info *info, bfd_vma address) |
| 1445 | { |
| 1446 | /* If tls_sec is NULL, we should have signalled an error already. */ |
| 1447 | if (elf_hash_table (info)->tls_sec == NULL) |
| 1448 | return 0; |
| 1449 | return address - elf_hash_table (info)->tls_sec->vma - DTP_OFFSET; |
| 1450 | } |
| 1451 | |
| 1452 | /* Return the relocation value for a static TLS tp-relative relocation. */ |
| 1453 | |
| 1454 | static bfd_vma |
| 1455 | tpoff (struct bfd_link_info *info, bfd_vma address) |
| 1456 | { |
| 1457 | /* If tls_sec is NULL, we should have signalled an error already. */ |
| 1458 | if (elf_hash_table (info)->tls_sec == NULL) |
| 1459 | return 0; |
| 1460 | return address - elf_hash_table (info)->tls_sec->vma - TP_OFFSET; |
| 1461 | } |
| 1462 | |
| 1463 | /* Return the global pointer's value, or 0 if it is not in use. */ |
| 1464 | |
| 1465 | static bfd_vma |
| 1466 | riscv_global_pointer_value (struct bfd_link_info *info) |
| 1467 | { |
| 1468 | struct bfd_link_hash_entry *h; |
| 1469 | |
| 1470 | h = bfd_link_hash_lookup (info->hash, GP_NAME, FALSE, FALSE, TRUE); |
| 1471 | if (h == NULL || h->type != bfd_link_hash_defined) |
| 1472 | return 0; |
| 1473 | |
| 1474 | return h->u.def.value + sec_addr (h->u.def.section); |
| 1475 | } |
| 1476 | |
| 1477 | /* Emplace a static relocation. */ |
| 1478 | |
| 1479 | static bfd_reloc_status_type |
| 1480 | perform_relocation (const reloc_howto_type *howto, |
| 1481 | const Elf_Internal_Rela *rel, |
| 1482 | bfd_vma value, |
| 1483 | asection *input_section, |
| 1484 | bfd *input_bfd, |
| 1485 | bfd_byte *contents) |
| 1486 | { |
| 1487 | if (howto->pc_relative) |
| 1488 | value -= sec_addr (input_section) + rel->r_offset; |
| 1489 | value += rel->r_addend; |
| 1490 | |
| 1491 | switch (ELFNN_R_TYPE (rel->r_info)) |
| 1492 | { |
| 1493 | case R_RISCV_HI20: |
| 1494 | case R_RISCV_TPREL_HI20: |
| 1495 | case R_RISCV_PCREL_HI20: |
| 1496 | case R_RISCV_GOT_HI20: |
| 1497 | case R_RISCV_TLS_GOT_HI20: |
| 1498 | case R_RISCV_TLS_GD_HI20: |
| 1499 | if (ARCH_SIZE > 32 && !VALID_UTYPE_IMM (RISCV_CONST_HIGH_PART (value))) |
| 1500 | return bfd_reloc_overflow; |
| 1501 | value = ENCODE_UTYPE_IMM (RISCV_CONST_HIGH_PART (value)); |
| 1502 | break; |
| 1503 | |
| 1504 | case R_RISCV_LO12_I: |
| 1505 | case R_RISCV_GPREL_I: |
| 1506 | case R_RISCV_TPREL_LO12_I: |
| 1507 | case R_RISCV_TPREL_I: |
| 1508 | case R_RISCV_PCREL_LO12_I: |
| 1509 | value = ENCODE_ITYPE_IMM (value); |
| 1510 | break; |
| 1511 | |
| 1512 | case R_RISCV_LO12_S: |
| 1513 | case R_RISCV_GPREL_S: |
| 1514 | case R_RISCV_TPREL_LO12_S: |
| 1515 | case R_RISCV_TPREL_S: |
| 1516 | case R_RISCV_PCREL_LO12_S: |
| 1517 | value = ENCODE_STYPE_IMM (value); |
| 1518 | break; |
| 1519 | |
| 1520 | case R_RISCV_CALL: |
| 1521 | case R_RISCV_CALL_PLT: |
| 1522 | if (ARCH_SIZE > 32 && !VALID_UTYPE_IMM (RISCV_CONST_HIGH_PART (value))) |
| 1523 | return bfd_reloc_overflow; |
| 1524 | value = ENCODE_UTYPE_IMM (RISCV_CONST_HIGH_PART (value)) |
| 1525 | | (ENCODE_ITYPE_IMM (value) << 32); |
| 1526 | break; |
| 1527 | |
| 1528 | case R_RISCV_JAL: |
| 1529 | if (!VALID_UJTYPE_IMM (value)) |
| 1530 | return bfd_reloc_overflow; |
| 1531 | value = ENCODE_UJTYPE_IMM (value); |
| 1532 | break; |
| 1533 | |
| 1534 | case R_RISCV_BRANCH: |
| 1535 | if (!VALID_SBTYPE_IMM (value)) |
| 1536 | return bfd_reloc_overflow; |
| 1537 | value = ENCODE_SBTYPE_IMM (value); |
| 1538 | break; |
| 1539 | |
| 1540 | case R_RISCV_RVC_BRANCH: |
| 1541 | if (!VALID_RVC_B_IMM (value)) |
| 1542 | return bfd_reloc_overflow; |
| 1543 | value = ENCODE_RVC_B_IMM (value); |
| 1544 | break; |
| 1545 | |
| 1546 | case R_RISCV_RVC_JUMP: |
| 1547 | if (!VALID_RVC_J_IMM (value)) |
| 1548 | return bfd_reloc_overflow; |
| 1549 | value = ENCODE_RVC_J_IMM (value); |
| 1550 | break; |
| 1551 | |
| 1552 | case R_RISCV_RVC_LUI: |
| 1553 | if (!VALID_RVC_LUI_IMM (RISCV_CONST_HIGH_PART (value))) |
| 1554 | return bfd_reloc_overflow; |
| 1555 | value = ENCODE_RVC_LUI_IMM (RISCV_CONST_HIGH_PART (value)); |
| 1556 | break; |
| 1557 | |
| 1558 | case R_RISCV_32: |
| 1559 | case R_RISCV_64: |
| 1560 | case R_RISCV_ADD8: |
| 1561 | case R_RISCV_ADD16: |
| 1562 | case R_RISCV_ADD32: |
| 1563 | case R_RISCV_ADD64: |
| 1564 | case R_RISCV_SUB6: |
| 1565 | case R_RISCV_SUB8: |
| 1566 | case R_RISCV_SUB16: |
| 1567 | case R_RISCV_SUB32: |
| 1568 | case R_RISCV_SUB64: |
| 1569 | case R_RISCV_SET6: |
| 1570 | case R_RISCV_SET8: |
| 1571 | case R_RISCV_SET16: |
| 1572 | case R_RISCV_SET32: |
| 1573 | case R_RISCV_TLS_DTPREL32: |
| 1574 | case R_RISCV_TLS_DTPREL64: |
| 1575 | break; |
| 1576 | |
| 1577 | default: |
| 1578 | return bfd_reloc_notsupported; |
| 1579 | } |
| 1580 | |
| 1581 | bfd_vma word = bfd_get (howto->bitsize, input_bfd, contents + rel->r_offset); |
| 1582 | word = (word & ~howto->dst_mask) | (value & howto->dst_mask); |
| 1583 | bfd_put (howto->bitsize, input_bfd, word, contents + rel->r_offset); |
| 1584 | |
| 1585 | return bfd_reloc_ok; |
| 1586 | } |
| 1587 | |
| 1588 | /* Remember all PC-relative high-part relocs we've encountered to help us |
| 1589 | later resolve the corresponding low-part relocs. */ |
| 1590 | |
| 1591 | typedef struct |
| 1592 | { |
| 1593 | bfd_vma address; |
| 1594 | bfd_vma value; |
| 1595 | } riscv_pcrel_hi_reloc; |
| 1596 | |
| 1597 | typedef struct riscv_pcrel_lo_reloc |
| 1598 | { |
| 1599 | asection * input_section; |
| 1600 | struct bfd_link_info * info; |
| 1601 | reloc_howto_type * howto; |
| 1602 | const Elf_Internal_Rela * reloc; |
| 1603 | bfd_vma addr; |
| 1604 | const char * name; |
| 1605 | bfd_byte * contents; |
| 1606 | struct riscv_pcrel_lo_reloc * next; |
| 1607 | } riscv_pcrel_lo_reloc; |
| 1608 | |
| 1609 | typedef struct |
| 1610 | { |
| 1611 | htab_t hi_relocs; |
| 1612 | riscv_pcrel_lo_reloc *lo_relocs; |
| 1613 | } riscv_pcrel_relocs; |
| 1614 | |
| 1615 | static hashval_t |
| 1616 | riscv_pcrel_reloc_hash (const void *entry) |
| 1617 | { |
| 1618 | const riscv_pcrel_hi_reloc *e = entry; |
| 1619 | return (hashval_t)(e->address >> 2); |
| 1620 | } |
| 1621 | |
| 1622 | static bfd_boolean |
| 1623 | riscv_pcrel_reloc_eq (const void *entry1, const void *entry2) |
| 1624 | { |
| 1625 | const riscv_pcrel_hi_reloc *e1 = entry1, *e2 = entry2; |
| 1626 | return e1->address == e2->address; |
| 1627 | } |
| 1628 | |
| 1629 | static bfd_boolean |
| 1630 | riscv_init_pcrel_relocs (riscv_pcrel_relocs *p) |
| 1631 | { |
| 1632 | |
| 1633 | p->lo_relocs = NULL; |
| 1634 | p->hi_relocs = htab_create (1024, riscv_pcrel_reloc_hash, |
| 1635 | riscv_pcrel_reloc_eq, free); |
| 1636 | return p->hi_relocs != NULL; |
| 1637 | } |
| 1638 | |
| 1639 | static void |
| 1640 | riscv_free_pcrel_relocs (riscv_pcrel_relocs *p) |
| 1641 | { |
| 1642 | riscv_pcrel_lo_reloc *cur = p->lo_relocs; |
| 1643 | |
| 1644 | while (cur != NULL) |
| 1645 | { |
| 1646 | riscv_pcrel_lo_reloc *next = cur->next; |
| 1647 | free (cur); |
| 1648 | cur = next; |
| 1649 | } |
| 1650 | |
| 1651 | htab_delete (p->hi_relocs); |
| 1652 | } |
| 1653 | |
| 1654 | static bfd_boolean |
| 1655 | riscv_record_pcrel_hi_reloc (riscv_pcrel_relocs *p, bfd_vma addr, bfd_vma value) |
| 1656 | { |
| 1657 | riscv_pcrel_hi_reloc entry = {addr, value - addr}; |
| 1658 | riscv_pcrel_hi_reloc **slot = |
| 1659 | (riscv_pcrel_hi_reloc **) htab_find_slot (p->hi_relocs, &entry, INSERT); |
| 1660 | |
| 1661 | BFD_ASSERT (*slot == NULL); |
| 1662 | *slot = (riscv_pcrel_hi_reloc *) bfd_malloc (sizeof (riscv_pcrel_hi_reloc)); |
| 1663 | if (*slot == NULL) |
| 1664 | return FALSE; |
| 1665 | **slot = entry; |
| 1666 | return TRUE; |
| 1667 | } |
| 1668 | |
| 1669 | static bfd_boolean |
| 1670 | riscv_record_pcrel_lo_reloc (riscv_pcrel_relocs *p, |
| 1671 | asection *input_section, |
| 1672 | struct bfd_link_info *info, |
| 1673 | reloc_howto_type *howto, |
| 1674 | const Elf_Internal_Rela *reloc, |
| 1675 | bfd_vma addr, |
| 1676 | const char *name, |
| 1677 | bfd_byte *contents) |
| 1678 | { |
| 1679 | riscv_pcrel_lo_reloc *entry; |
| 1680 | entry = (riscv_pcrel_lo_reloc *) bfd_malloc (sizeof (riscv_pcrel_lo_reloc)); |
| 1681 | if (entry == NULL) |
| 1682 | return FALSE; |
| 1683 | *entry = (riscv_pcrel_lo_reloc) {input_section, info, howto, reloc, addr, |
| 1684 | name, contents, p->lo_relocs}; |
| 1685 | p->lo_relocs = entry; |
| 1686 | return TRUE; |
| 1687 | } |
| 1688 | |
| 1689 | static bfd_boolean |
| 1690 | riscv_resolve_pcrel_lo_relocs (riscv_pcrel_relocs *p) |
| 1691 | { |
| 1692 | riscv_pcrel_lo_reloc *r; |
| 1693 | |
| 1694 | for (r = p->lo_relocs; r != NULL; r = r->next) |
| 1695 | { |
| 1696 | bfd *input_bfd = r->input_section->owner; |
| 1697 | |
| 1698 | riscv_pcrel_hi_reloc search = {r->addr, 0}; |
| 1699 | riscv_pcrel_hi_reloc *entry = htab_find (p->hi_relocs, &search); |
| 1700 | if (entry == NULL) |
| 1701 | { |
| 1702 | ((*r->info->callbacks->reloc_overflow) |
| 1703 | (r->info, NULL, r->name, r->howto->name, (bfd_vma) 0, |
| 1704 | input_bfd, r->input_section, r->reloc->r_offset)); |
| 1705 | return TRUE; |
| 1706 | } |
| 1707 | |
| 1708 | perform_relocation (r->howto, r->reloc, entry->value, r->input_section, |
| 1709 | input_bfd, r->contents); |
| 1710 | } |
| 1711 | |
| 1712 | return TRUE; |
| 1713 | } |
| 1714 | |
| 1715 | /* Relocate a RISC-V ELF section. |
| 1716 | |
| 1717 | The RELOCATE_SECTION function is called by the new ELF backend linker |
| 1718 | to handle the relocations for a section. |
| 1719 | |
| 1720 | The relocs are always passed as Rela structures. |
| 1721 | |
| 1722 | This function is responsible for adjusting the section contents as |
| 1723 | necessary, and (if generating a relocatable output file) adjusting |
| 1724 | the reloc addend as necessary. |
| 1725 | |
| 1726 | This function does not have to worry about setting the reloc |
| 1727 | address or the reloc symbol index. |
| 1728 | |
| 1729 | LOCAL_SYMS is a pointer to the swapped in local symbols. |
| 1730 | |
| 1731 | LOCAL_SECTIONS is an array giving the section in the input file |
| 1732 | corresponding to the st_shndx field of each local symbol. |
| 1733 | |
| 1734 | The global hash table entry for the global symbols can be found |
| 1735 | via elf_sym_hashes (input_bfd). |
| 1736 | |
| 1737 | When generating relocatable output, this function must handle |
| 1738 | STB_LOCAL/STT_SECTION symbols specially. The output symbol is |
| 1739 | going to be the section symbol corresponding to the output |
| 1740 | section, which means that the addend must be adjusted |
| 1741 | accordingly. */ |
| 1742 | |
| 1743 | static bfd_boolean |
| 1744 | riscv_elf_relocate_section (bfd *output_bfd, |
| 1745 | struct bfd_link_info *info, |
| 1746 | bfd *input_bfd, |
| 1747 | asection *input_section, |
| 1748 | bfd_byte *contents, |
| 1749 | Elf_Internal_Rela *relocs, |
| 1750 | Elf_Internal_Sym *local_syms, |
| 1751 | asection **local_sections) |
| 1752 | { |
| 1753 | Elf_Internal_Rela *rel; |
| 1754 | Elf_Internal_Rela *relend; |
| 1755 | riscv_pcrel_relocs pcrel_relocs; |
| 1756 | bfd_boolean ret = FALSE; |
| 1757 | asection *sreloc = elf_section_data (input_section)->sreloc; |
| 1758 | struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info); |
| 1759 | Elf_Internal_Shdr *symtab_hdr = &elf_symtab_hdr (input_bfd); |
| 1760 | struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (input_bfd); |
| 1761 | bfd_vma *local_got_offsets = elf_local_got_offsets (input_bfd); |
| 1762 | |
| 1763 | if (!riscv_init_pcrel_relocs (&pcrel_relocs)) |
| 1764 | return FALSE; |
| 1765 | |
| 1766 | relend = relocs + input_section->reloc_count; |
| 1767 | for (rel = relocs; rel < relend; rel++) |
| 1768 | { |
| 1769 | unsigned long r_symndx; |
| 1770 | struct elf_link_hash_entry *h; |
| 1771 | Elf_Internal_Sym *sym; |
| 1772 | asection *sec; |
| 1773 | bfd_vma relocation; |
| 1774 | bfd_reloc_status_type r = bfd_reloc_ok; |
| 1775 | const char *name; |
| 1776 | bfd_vma off, ie_off; |
| 1777 | bfd_boolean unresolved_reloc, is_ie = FALSE; |
| 1778 | bfd_vma pc = sec_addr (input_section) + rel->r_offset; |
| 1779 | int r_type = ELFNN_R_TYPE (rel->r_info), tls_type; |
| 1780 | reloc_howto_type *howto = riscv_elf_rtype_to_howto (r_type); |
| 1781 | const char *msg = NULL; |
| 1782 | |
| 1783 | if (r_type == R_RISCV_GNU_VTINHERIT || r_type == R_RISCV_GNU_VTENTRY) |
| 1784 | continue; |
| 1785 | |
| 1786 | /* This is a final link. */ |
| 1787 | r_symndx = ELFNN_R_SYM (rel->r_info); |
| 1788 | h = NULL; |
| 1789 | sym = NULL; |
| 1790 | sec = NULL; |
| 1791 | unresolved_reloc = FALSE; |
| 1792 | if (r_symndx < symtab_hdr->sh_info) |
| 1793 | { |
| 1794 | sym = local_syms + r_symndx; |
| 1795 | sec = local_sections[r_symndx]; |
| 1796 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); |
| 1797 | } |
| 1798 | else |
| 1799 | { |
| 1800 | bfd_boolean warned, ignored; |
| 1801 | |
| 1802 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
| 1803 | r_symndx, symtab_hdr, sym_hashes, |
| 1804 | h, sec, relocation, |
| 1805 | unresolved_reloc, warned, ignored); |
| 1806 | if (warned) |
| 1807 | { |
| 1808 | /* To avoid generating warning messages about truncated |
| 1809 | relocations, set the relocation's address to be the same as |
| 1810 | the start of this section. */ |
| 1811 | if (input_section->output_section != NULL) |
| 1812 | relocation = input_section->output_section->vma; |
| 1813 | else |
| 1814 | relocation = 0; |
| 1815 | } |
| 1816 | } |
| 1817 | |
| 1818 | if (sec != NULL && discarded_section (sec)) |
| 1819 | RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, |
| 1820 | rel, 1, relend, howto, 0, contents); |
| 1821 | |
| 1822 | if (bfd_link_relocatable (info)) |
| 1823 | continue; |
| 1824 | |
| 1825 | if (h != NULL) |
| 1826 | name = h->root.root.string; |
| 1827 | else |
| 1828 | { |
| 1829 | name = (bfd_elf_string_from_elf_section |
| 1830 | (input_bfd, symtab_hdr->sh_link, sym->st_name)); |
| 1831 | if (name == NULL || *name == '\0') |
| 1832 | name = bfd_section_name (input_bfd, sec); |
| 1833 | } |
| 1834 | |
| 1835 | switch (r_type) |
| 1836 | { |
| 1837 | case R_RISCV_NONE: |
| 1838 | case R_RISCV_RELAX: |
| 1839 | case R_RISCV_TPREL_ADD: |
| 1840 | case R_RISCV_COPY: |
| 1841 | case R_RISCV_JUMP_SLOT: |
| 1842 | case R_RISCV_RELATIVE: |
| 1843 | /* These require nothing of us at all. */ |
| 1844 | continue; |
| 1845 | |
| 1846 | case R_RISCV_HI20: |
| 1847 | case R_RISCV_BRANCH: |
| 1848 | case R_RISCV_RVC_BRANCH: |
| 1849 | case R_RISCV_RVC_LUI: |
| 1850 | case R_RISCV_LO12_I: |
| 1851 | case R_RISCV_LO12_S: |
| 1852 | case R_RISCV_SET6: |
| 1853 | case R_RISCV_SET8: |
| 1854 | case R_RISCV_SET16: |
| 1855 | case R_RISCV_SET32: |
| 1856 | /* These require no special handling beyond perform_relocation. */ |
| 1857 | break; |
| 1858 | |
| 1859 | case R_RISCV_GOT_HI20: |
| 1860 | if (h != NULL) |
| 1861 | { |
| 1862 | bfd_boolean dyn, pic; |
| 1863 | |
| 1864 | off = h->got.offset; |
| 1865 | BFD_ASSERT (off != (bfd_vma) -1); |
| 1866 | dyn = elf_hash_table (info)->dynamic_sections_created; |
| 1867 | pic = bfd_link_pic (info); |
| 1868 | |
| 1869 | if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, pic, h) |
| 1870 | || (pic && SYMBOL_REFERENCES_LOCAL (info, h))) |
| 1871 | { |
| 1872 | /* This is actually a static link, or it is a |
| 1873 | -Bsymbolic link and the symbol is defined |
| 1874 | locally, or the symbol was forced to be local |
| 1875 | because of a version file. We must initialize |
| 1876 | this entry in the global offset table. Since the |
| 1877 | offset must always be a multiple of the word size, |
| 1878 | we use the least significant bit to record whether |
| 1879 | we have initialized it already. |
| 1880 | |
| 1881 | When doing a dynamic link, we create a .rela.got |
| 1882 | relocation entry to initialize the value. This |
| 1883 | is done in the finish_dynamic_symbol routine. */ |
| 1884 | if ((off & 1) != 0) |
| 1885 | off &= ~1; |
| 1886 | else |
| 1887 | { |
| 1888 | bfd_put_NN (output_bfd, relocation, |
| 1889 | htab->elf.sgot->contents + off); |
| 1890 | h->got.offset |= 1; |
| 1891 | } |
| 1892 | } |
| 1893 | else |
| 1894 | unresolved_reloc = FALSE; |
| 1895 | } |
| 1896 | else |
| 1897 | { |
| 1898 | BFD_ASSERT (local_got_offsets != NULL |
| 1899 | && local_got_offsets[r_symndx] != (bfd_vma) -1); |
| 1900 | |
| 1901 | off = local_got_offsets[r_symndx]; |
| 1902 | |
| 1903 | /* The offset must always be a multiple of the word size. |
| 1904 | So, we can use the least significant bit to record |
| 1905 | whether we have already processed this entry. */ |
| 1906 | if ((off & 1) != 0) |
| 1907 | off &= ~1; |
| 1908 | else |
| 1909 | { |
| 1910 | if (bfd_link_pic (info)) |
| 1911 | { |
| 1912 | asection *s; |
| 1913 | Elf_Internal_Rela outrel; |
| 1914 | |
| 1915 | /* We need to generate a R_RISCV_RELATIVE reloc |
| 1916 | for the dynamic linker. */ |
| 1917 | s = htab->elf.srelgot; |
| 1918 | BFD_ASSERT (s != NULL); |
| 1919 | |
| 1920 | outrel.r_offset = sec_addr (htab->elf.sgot) + off; |
| 1921 | outrel.r_info = |
| 1922 | ELFNN_R_INFO (0, R_RISCV_RELATIVE); |
| 1923 | outrel.r_addend = relocation; |
| 1924 | relocation = 0; |
| 1925 | riscv_elf_append_rela (output_bfd, s, &outrel); |
| 1926 | } |
| 1927 | |
| 1928 | bfd_put_NN (output_bfd, relocation, |
| 1929 | htab->elf.sgot->contents + off); |
| 1930 | local_got_offsets[r_symndx] |= 1; |
| 1931 | } |
| 1932 | } |
| 1933 | relocation = sec_addr (htab->elf.sgot) + off; |
| 1934 | if (!riscv_record_pcrel_hi_reloc (&pcrel_relocs, pc, relocation)) |
| 1935 | r = bfd_reloc_overflow; |
| 1936 | break; |
| 1937 | |
| 1938 | case R_RISCV_ADD8: |
| 1939 | case R_RISCV_ADD16: |
| 1940 | case R_RISCV_ADD32: |
| 1941 | case R_RISCV_ADD64: |
| 1942 | { |
| 1943 | bfd_vma old_value = bfd_get (howto->bitsize, input_bfd, |
| 1944 | contents + rel->r_offset); |
| 1945 | relocation = old_value + relocation; |
| 1946 | } |
| 1947 | break; |
| 1948 | |
| 1949 | case R_RISCV_SUB6: |
| 1950 | case R_RISCV_SUB8: |
| 1951 | case R_RISCV_SUB16: |
| 1952 | case R_RISCV_SUB32: |
| 1953 | case R_RISCV_SUB64: |
| 1954 | { |
| 1955 | bfd_vma old_value = bfd_get (howto->bitsize, input_bfd, |
| 1956 | contents + rel->r_offset); |
| 1957 | relocation = old_value - relocation; |
| 1958 | } |
| 1959 | break; |
| 1960 | |
| 1961 | case R_RISCV_CALL_PLT: |
| 1962 | case R_RISCV_CALL: |
| 1963 | case R_RISCV_JAL: |
| 1964 | case R_RISCV_RVC_JUMP: |
| 1965 | if (bfd_link_pic (info) && h != NULL && h->plt.offset != MINUS_ONE) |
| 1966 | { |
| 1967 | /* Refer to the PLT entry. */ |
| 1968 | relocation = sec_addr (htab->elf.splt) + h->plt.offset; |
| 1969 | unresolved_reloc = FALSE; |
| 1970 | } |
| 1971 | break; |
| 1972 | |
| 1973 | case R_RISCV_TPREL_HI20: |
| 1974 | relocation = tpoff (info, relocation); |
| 1975 | break; |
| 1976 | |
| 1977 | case R_RISCV_TPREL_LO12_I: |
| 1978 | case R_RISCV_TPREL_LO12_S: |
| 1979 | relocation = tpoff (info, relocation); |
| 1980 | break; |
| 1981 | |
| 1982 | case R_RISCV_TPREL_I: |
| 1983 | case R_RISCV_TPREL_S: |
| 1984 | relocation = tpoff (info, relocation); |
| 1985 | if (VALID_ITYPE_IMM (relocation + rel->r_addend)) |
| 1986 | { |
| 1987 | /* We can use tp as the base register. */ |
| 1988 | bfd_vma insn = bfd_get_32 (input_bfd, contents + rel->r_offset); |
| 1989 | insn &= ~(OP_MASK_RS1 << OP_SH_RS1); |
| 1990 | insn |= X_TP << OP_SH_RS1; |
| 1991 | bfd_put_32 (input_bfd, insn, contents + rel->r_offset); |
| 1992 | } |
| 1993 | else |
| 1994 | r = bfd_reloc_overflow; |
| 1995 | break; |
| 1996 | |
| 1997 | case R_RISCV_GPREL_I: |
| 1998 | case R_RISCV_GPREL_S: |
| 1999 | { |
| 2000 | bfd_vma gp = riscv_global_pointer_value (info); |
| 2001 | bfd_boolean x0_base = VALID_ITYPE_IMM (relocation + rel->r_addend); |
| 2002 | if (x0_base || VALID_ITYPE_IMM (relocation + rel->r_addend - gp)) |
| 2003 | { |
| 2004 | /* We can use x0 or gp as the base register. */ |
| 2005 | bfd_vma insn = bfd_get_32 (input_bfd, contents + rel->r_offset); |
| 2006 | insn &= ~(OP_MASK_RS1 << OP_SH_RS1); |
| 2007 | if (!x0_base) |
| 2008 | { |
| 2009 | rel->r_addend -= gp; |
| 2010 | insn |= X_GP << OP_SH_RS1; |
| 2011 | } |
| 2012 | bfd_put_32 (input_bfd, insn, contents + rel->r_offset); |
| 2013 | } |
| 2014 | else |
| 2015 | r = bfd_reloc_overflow; |
| 2016 | break; |
| 2017 | } |
| 2018 | |
| 2019 | case R_RISCV_PCREL_HI20: |
| 2020 | if (!riscv_record_pcrel_hi_reloc (&pcrel_relocs, pc, |
| 2021 | relocation + rel->r_addend)) |
| 2022 | r = bfd_reloc_overflow; |
| 2023 | break; |
| 2024 | |
| 2025 | case R_RISCV_PCREL_LO12_I: |
| 2026 | case R_RISCV_PCREL_LO12_S: |
| 2027 | if (riscv_record_pcrel_lo_reloc (&pcrel_relocs, input_section, info, |
| 2028 | howto, rel, relocation, name, |
| 2029 | contents)) |
| 2030 | continue; |
| 2031 | r = bfd_reloc_overflow; |
| 2032 | break; |
| 2033 | |
| 2034 | case R_RISCV_TLS_DTPREL32: |
| 2035 | case R_RISCV_TLS_DTPREL64: |
| 2036 | relocation = dtpoff (info, relocation); |
| 2037 | break; |
| 2038 | |
| 2039 | case R_RISCV_32: |
| 2040 | case R_RISCV_64: |
| 2041 | if ((input_section->flags & SEC_ALLOC) == 0) |
| 2042 | break; |
| 2043 | |
| 2044 | if ((bfd_link_pic (info) |
| 2045 | && (h == NULL |
| 2046 | || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
| 2047 | || h->root.type != bfd_link_hash_undefweak) |
| 2048 | && (! howto->pc_relative |
| 2049 | || !SYMBOL_CALLS_LOCAL (info, h))) |
| 2050 | || (!bfd_link_pic (info) |
| 2051 | && h != NULL |
| 2052 | && h->dynindx != -1 |
| 2053 | && !h->non_got_ref |
| 2054 | && ((h->def_dynamic |
| 2055 | && !h->def_regular) |
| 2056 | || h->root.type == bfd_link_hash_undefweak |
| 2057 | || h->root.type == bfd_link_hash_undefined))) |
| 2058 | { |
| 2059 | Elf_Internal_Rela outrel; |
| 2060 | bfd_boolean skip_static_relocation, skip_dynamic_relocation; |
| 2061 | |
| 2062 | /* When generating a shared object, these relocations |
| 2063 | are copied into the output file to be resolved at run |
| 2064 | time. */ |
| 2065 | |
| 2066 | outrel.r_offset = |
| 2067 | _bfd_elf_section_offset (output_bfd, info, input_section, |
| 2068 | rel->r_offset); |
| 2069 | skip_static_relocation = outrel.r_offset != (bfd_vma) -2; |
| 2070 | skip_dynamic_relocation = outrel.r_offset >= (bfd_vma) -2; |
| 2071 | outrel.r_offset += sec_addr (input_section); |
| 2072 | |
| 2073 | if (skip_dynamic_relocation) |
| 2074 | memset (&outrel, 0, sizeof outrel); |
| 2075 | else if (h != NULL && h->dynindx != -1 |
| 2076 | && !(bfd_link_pic (info) |
| 2077 | && SYMBOLIC_BIND (info, h) |
| 2078 | && h->def_regular)) |
| 2079 | { |
| 2080 | outrel.r_info = ELFNN_R_INFO (h->dynindx, r_type); |
| 2081 | outrel.r_addend = rel->r_addend; |
| 2082 | } |
| 2083 | else |
| 2084 | { |
| 2085 | outrel.r_info = ELFNN_R_INFO (0, R_RISCV_RELATIVE); |
| 2086 | outrel.r_addend = relocation + rel->r_addend; |
| 2087 | } |
| 2088 | |
| 2089 | riscv_elf_append_rela (output_bfd, sreloc, &outrel); |
| 2090 | if (skip_static_relocation) |
| 2091 | continue; |
| 2092 | } |
| 2093 | break; |
| 2094 | |
| 2095 | case R_RISCV_TLS_GOT_HI20: |
| 2096 | is_ie = TRUE; |
| 2097 | /* Fall through. */ |
| 2098 | |
| 2099 | case R_RISCV_TLS_GD_HI20: |
| 2100 | if (h != NULL) |
| 2101 | { |
| 2102 | off = h->got.offset; |
| 2103 | h->got.offset |= 1; |
| 2104 | } |
| 2105 | else |
| 2106 | { |
| 2107 | off = local_got_offsets[r_symndx]; |
| 2108 | local_got_offsets[r_symndx] |= 1; |
| 2109 | } |
| 2110 | |
| 2111 | tls_type = _bfd_riscv_elf_tls_type (input_bfd, h, r_symndx); |
| 2112 | BFD_ASSERT (tls_type & (GOT_TLS_IE | GOT_TLS_GD)); |
| 2113 | /* If this symbol is referenced by both GD and IE TLS, the IE |
| 2114 | reference's GOT slot follows the GD reference's slots. */ |
| 2115 | ie_off = 0; |
| 2116 | if ((tls_type & GOT_TLS_GD) && (tls_type & GOT_TLS_IE)) |
| 2117 | ie_off = 2 * GOT_ENTRY_SIZE; |
| 2118 | |
| 2119 | if ((off & 1) != 0) |
| 2120 | off &= ~1; |
| 2121 | else |
| 2122 | { |
| 2123 | Elf_Internal_Rela outrel; |
| 2124 | int indx = 0; |
| 2125 | bfd_boolean need_relocs = FALSE; |
| 2126 | |
| 2127 | if (htab->elf.srelgot == NULL) |
| 2128 | abort (); |
| 2129 | |
| 2130 | if (h != NULL) |
| 2131 | { |
| 2132 | bfd_boolean dyn, pic; |
| 2133 | dyn = htab->elf.dynamic_sections_created; |
| 2134 | pic = bfd_link_pic (info); |
| 2135 | |
| 2136 | if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, pic, h) |
| 2137 | && (!pic || !SYMBOL_REFERENCES_LOCAL (info, h))) |
| 2138 | indx = h->dynindx; |
| 2139 | } |
| 2140 | |
| 2141 | /* The GOT entries have not been initialized yet. Do it |
| 2142 | now, and emit any relocations. */ |
| 2143 | if ((bfd_link_pic (info) || indx != 0) |
| 2144 | && (h == NULL |
| 2145 | || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
| 2146 | || h->root.type != bfd_link_hash_undefweak)) |
| 2147 | need_relocs = TRUE; |
| 2148 | |
| 2149 | if (tls_type & GOT_TLS_GD) |
| 2150 | { |
| 2151 | if (need_relocs) |
| 2152 | { |
| 2153 | outrel.r_offset = sec_addr (htab->elf.sgot) + off; |
| 2154 | outrel.r_addend = 0; |
| 2155 | outrel.r_info = ELFNN_R_INFO (indx, R_RISCV_TLS_DTPMODNN); |
| 2156 | bfd_put_NN (output_bfd, 0, |
| 2157 | htab->elf.sgot->contents + off); |
| 2158 | riscv_elf_append_rela (output_bfd, htab->elf.srelgot, &outrel); |
| 2159 | if (indx == 0) |
| 2160 | { |
| 2161 | BFD_ASSERT (! unresolved_reloc); |
| 2162 | bfd_put_NN (output_bfd, |
| 2163 | dtpoff (info, relocation), |
| 2164 | (htab->elf.sgot->contents + off + |
| 2165 | RISCV_ELF_WORD_BYTES)); |
| 2166 | } |
| 2167 | else |
| 2168 | { |
| 2169 | bfd_put_NN (output_bfd, 0, |
| 2170 | (htab->elf.sgot->contents + off + |
| 2171 | RISCV_ELF_WORD_BYTES)); |
| 2172 | outrel.r_info = ELFNN_R_INFO (indx, R_RISCV_TLS_DTPRELNN); |
| 2173 | outrel.r_offset += RISCV_ELF_WORD_BYTES; |
| 2174 | riscv_elf_append_rela (output_bfd, htab->elf.srelgot, &outrel); |
| 2175 | } |
| 2176 | } |
| 2177 | else |
| 2178 | { |
| 2179 | /* If we are not emitting relocations for a |
| 2180 | general dynamic reference, then we must be in a |
| 2181 | static link or an executable link with the |
| 2182 | symbol binding locally. Mark it as belonging |
| 2183 | to module 1, the executable. */ |
| 2184 | bfd_put_NN (output_bfd, 1, |
| 2185 | htab->elf.sgot->contents + off); |
| 2186 | bfd_put_NN (output_bfd, |
| 2187 | dtpoff (info, relocation), |
| 2188 | (htab->elf.sgot->contents + off + |
| 2189 | RISCV_ELF_WORD_BYTES)); |
| 2190 | } |
| 2191 | } |
| 2192 | |
| 2193 | if (tls_type & GOT_TLS_IE) |
| 2194 | { |
| 2195 | if (need_relocs) |
| 2196 | { |
| 2197 | bfd_put_NN (output_bfd, 0, |
| 2198 | htab->elf.sgot->contents + off + ie_off); |
| 2199 | outrel.r_offset = sec_addr (htab->elf.sgot) |
| 2200 | + off + ie_off; |
| 2201 | outrel.r_addend = 0; |
| 2202 | if (indx == 0) |
| 2203 | outrel.r_addend = tpoff (info, relocation); |
| 2204 | outrel.r_info = ELFNN_R_INFO (indx, R_RISCV_TLS_TPRELNN); |
| 2205 | riscv_elf_append_rela (output_bfd, htab->elf.srelgot, &outrel); |
| 2206 | } |
| 2207 | else |
| 2208 | { |
| 2209 | bfd_put_NN (output_bfd, tpoff (info, relocation), |
| 2210 | htab->elf.sgot->contents + off + ie_off); |
| 2211 | } |
| 2212 | } |
| 2213 | } |
| 2214 | |
| 2215 | BFD_ASSERT (off < (bfd_vma) -2); |
| 2216 | relocation = sec_addr (htab->elf.sgot) + off + (is_ie ? ie_off : 0); |
| 2217 | if (!riscv_record_pcrel_hi_reloc (&pcrel_relocs, pc, relocation)) |
| 2218 | r = bfd_reloc_overflow; |
| 2219 | unresolved_reloc = FALSE; |
| 2220 | break; |
| 2221 | |
| 2222 | default: |
| 2223 | r = bfd_reloc_notsupported; |
| 2224 | } |
| 2225 | |
| 2226 | /* Dynamic relocs are not propagated for SEC_DEBUGGING sections |
| 2227 | because such sections are not SEC_ALLOC and thus ld.so will |
| 2228 | not process them. */ |
| 2229 | if (unresolved_reloc |
| 2230 | && !((input_section->flags & SEC_DEBUGGING) != 0 |
| 2231 | && h->def_dynamic) |
| 2232 | && _bfd_elf_section_offset (output_bfd, info, input_section, |
| 2233 | rel->r_offset) != (bfd_vma) -1) |
| 2234 | { |
| 2235 | (*_bfd_error_handler) |
| 2236 | (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), |
| 2237 | input_bfd, |
| 2238 | input_section, |
| 2239 | (long) rel->r_offset, |
| 2240 | howto->name, |
| 2241 | h->root.root.string); |
| 2242 | continue; |
| 2243 | } |
| 2244 | |
| 2245 | if (r == bfd_reloc_ok) |
| 2246 | r = perform_relocation (howto, rel, relocation, input_section, |
| 2247 | input_bfd, contents); |
| 2248 | |
| 2249 | switch (r) |
| 2250 | { |
| 2251 | case bfd_reloc_ok: |
| 2252 | continue; |
| 2253 | |
| 2254 | case bfd_reloc_overflow: |
| 2255 | info->callbacks->reloc_overflow |
| 2256 | (info, (h ? &h->root : NULL), name, howto->name, |
| 2257 | (bfd_vma) 0, input_bfd, input_section, rel->r_offset); |
| 2258 | break; |
| 2259 | |
| 2260 | case bfd_reloc_undefined: |
| 2261 | info->callbacks->undefined_symbol |
| 2262 | (info, name, input_bfd, input_section, rel->r_offset, |
| 2263 | TRUE); |
| 2264 | break; |
| 2265 | |
| 2266 | case bfd_reloc_outofrange: |
| 2267 | msg = _("internal error: out of range error"); |
| 2268 | break; |
| 2269 | |
| 2270 | case bfd_reloc_notsupported: |
| 2271 | msg = _("internal error: unsupported relocation error"); |
| 2272 | break; |
| 2273 | |
| 2274 | case bfd_reloc_dangerous: |
| 2275 | msg = _("internal error: dangerous relocation"); |
| 2276 | break; |
| 2277 | |
| 2278 | default: |
| 2279 | msg = _("internal error: unknown error"); |
| 2280 | break; |
| 2281 | } |
| 2282 | |
| 2283 | if (msg) |
| 2284 | info->callbacks->warning |
| 2285 | (info, msg, name, input_bfd, input_section, rel->r_offset); |
| 2286 | goto out; |
| 2287 | } |
| 2288 | |
| 2289 | ret = riscv_resolve_pcrel_lo_relocs (&pcrel_relocs); |
| 2290 | out: |
| 2291 | riscv_free_pcrel_relocs (&pcrel_relocs); |
| 2292 | return ret; |
| 2293 | } |
| 2294 | |
| 2295 | /* Finish up dynamic symbol handling. We set the contents of various |
| 2296 | dynamic sections here. */ |
| 2297 | |
| 2298 | static bfd_boolean |
| 2299 | riscv_elf_finish_dynamic_symbol (bfd *output_bfd, |
| 2300 | struct bfd_link_info *info, |
| 2301 | struct elf_link_hash_entry *h, |
| 2302 | Elf_Internal_Sym *sym) |
| 2303 | { |
| 2304 | struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info); |
| 2305 | const struct elf_backend_data *bed = get_elf_backend_data (output_bfd); |
| 2306 | |
| 2307 | if (h->plt.offset != (bfd_vma) -1) |
| 2308 | { |
| 2309 | /* We've decided to create a PLT entry for this symbol. */ |
| 2310 | bfd_byte *loc; |
| 2311 | bfd_vma i, header_address, plt_idx, got_address; |
| 2312 | uint32_t plt_entry[PLT_ENTRY_INSNS]; |
| 2313 | Elf_Internal_Rela rela; |
| 2314 | |
| 2315 | BFD_ASSERT (h->dynindx != -1); |
| 2316 | |
| 2317 | /* Calculate the address of the PLT header. */ |
| 2318 | header_address = sec_addr (htab->elf.splt); |
| 2319 | |
| 2320 | /* Calculate the index of the entry. */ |
| 2321 | plt_idx = (h->plt.offset - PLT_HEADER_SIZE) / PLT_ENTRY_SIZE; |
| 2322 | |
| 2323 | /* Calculate the address of the .got.plt entry. */ |
| 2324 | got_address = riscv_elf_got_plt_val (plt_idx, info); |
| 2325 | |
| 2326 | /* Find out where the .plt entry should go. */ |
| 2327 | loc = htab->elf.splt->contents + h->plt.offset; |
| 2328 | |
| 2329 | /* Fill in the PLT entry itself. */ |
| 2330 | riscv_make_plt_entry (got_address, header_address + h->plt.offset, |
| 2331 | plt_entry); |
| 2332 | for (i = 0; i < PLT_ENTRY_INSNS; i++) |
| 2333 | bfd_put_32 (output_bfd, plt_entry[i], loc + 4*i); |
| 2334 | |
| 2335 | /* Fill in the initial value of the .got.plt entry. */ |
| 2336 | loc = htab->elf.sgotplt->contents |
| 2337 | + (got_address - sec_addr (htab->elf.sgotplt)); |
| 2338 | bfd_put_NN (output_bfd, sec_addr (htab->elf.splt), loc); |
| 2339 | |
| 2340 | /* Fill in the entry in the .rela.plt section. */ |
| 2341 | rela.r_offset = got_address; |
| 2342 | rela.r_addend = 0; |
| 2343 | rela.r_info = ELFNN_R_INFO (h->dynindx, R_RISCV_JUMP_SLOT); |
| 2344 | |
| 2345 | loc = htab->elf.srelplt->contents + plt_idx * sizeof (ElfNN_External_Rela); |
| 2346 | bed->s->swap_reloca_out (output_bfd, &rela, loc); |
| 2347 | |
| 2348 | if (!h->def_regular) |
| 2349 | { |
| 2350 | /* Mark the symbol as undefined, rather than as defined in |
| 2351 | the .plt section. Leave the value alone. */ |
| 2352 | sym->st_shndx = SHN_UNDEF; |
| 2353 | /* If the symbol is weak, we do need to clear the value. |
| 2354 | Otherwise, the PLT entry would provide a definition for |
| 2355 | the symbol even if the symbol wasn't defined anywhere, |
| 2356 | and so the symbol would never be NULL. */ |
| 2357 | if (!h->ref_regular_nonweak) |
| 2358 | sym->st_value = 0; |
| 2359 | } |
| 2360 | } |
| 2361 | |
| 2362 | if (h->got.offset != (bfd_vma) -1 |
| 2363 | && !(riscv_elf_hash_entry (h)->tls_type & (GOT_TLS_GD | GOT_TLS_IE))) |
| 2364 | { |
| 2365 | asection *sgot; |
| 2366 | asection *srela; |
| 2367 | Elf_Internal_Rela rela; |
| 2368 | |
| 2369 | /* This symbol has an entry in the GOT. Set it up. */ |
| 2370 | |
| 2371 | sgot = htab->elf.sgot; |
| 2372 | srela = htab->elf.srelgot; |
| 2373 | BFD_ASSERT (sgot != NULL && srela != NULL); |
| 2374 | |
| 2375 | rela.r_offset = sec_addr (sgot) + (h->got.offset &~ (bfd_vma) 1); |
| 2376 | |
| 2377 | /* If this is a -Bsymbolic link, and the symbol is defined |
| 2378 | locally, we just want to emit a RELATIVE reloc. Likewise if |
| 2379 | the symbol was forced to be local because of a version file. |
| 2380 | The entry in the global offset table will already have been |
| 2381 | initialized in the relocate_section function. */ |
| 2382 | if (bfd_link_pic (info) |
| 2383 | && (info->symbolic || h->dynindx == -1) |
| 2384 | && h->def_regular) |
| 2385 | { |
| 2386 | asection *sec = h->root.u.def.section; |
| 2387 | rela.r_info = ELFNN_R_INFO (0, R_RISCV_RELATIVE); |
| 2388 | rela.r_addend = (h->root.u.def.value |
| 2389 | + sec->output_section->vma |
| 2390 | + sec->output_offset); |
| 2391 | } |
| 2392 | else |
| 2393 | { |
| 2394 | BFD_ASSERT (h->dynindx != -1); |
| 2395 | rela.r_info = ELFNN_R_INFO (h->dynindx, R_RISCV_NN); |
| 2396 | rela.r_addend = 0; |
| 2397 | } |
| 2398 | |
| 2399 | bfd_put_NN (output_bfd, 0, |
| 2400 | sgot->contents + (h->got.offset & ~(bfd_vma) 1)); |
| 2401 | riscv_elf_append_rela (output_bfd, srela, &rela); |
| 2402 | } |
| 2403 | |
| 2404 | if (h->needs_copy) |
| 2405 | { |
| 2406 | Elf_Internal_Rela rela; |
| 2407 | asection *s; |
| 2408 | |
| 2409 | /* This symbols needs a copy reloc. Set it up. */ |
| 2410 | BFD_ASSERT (h->dynindx != -1); |
| 2411 | |
| 2412 | rela.r_offset = sec_addr (h->root.u.def.section) + h->root.u.def.value; |
| 2413 | rela.r_info = ELFNN_R_INFO (h->dynindx, R_RISCV_COPY); |
| 2414 | rela.r_addend = 0; |
| 2415 | if (h->root.u.def.section == htab->elf.sdynrelro) |
| 2416 | s = htab->elf.sreldynrelro; |
| 2417 | else |
| 2418 | s = htab->elf.srelbss; |
| 2419 | riscv_elf_append_rela (output_bfd, s, &rela); |
| 2420 | } |
| 2421 | |
| 2422 | /* Mark some specially defined symbols as absolute. */ |
| 2423 | if (h == htab->elf.hdynamic |
| 2424 | || (h == htab->elf.hgot || h == htab->elf.hplt)) |
| 2425 | sym->st_shndx = SHN_ABS; |
| 2426 | |
| 2427 | return TRUE; |
| 2428 | } |
| 2429 | |
| 2430 | /* Finish up the dynamic sections. */ |
| 2431 | |
| 2432 | static bfd_boolean |
| 2433 | riscv_finish_dyn (bfd *output_bfd, struct bfd_link_info *info, |
| 2434 | bfd *dynobj, asection *sdyn) |
| 2435 | { |
| 2436 | struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info); |
| 2437 | const struct elf_backend_data *bed = get_elf_backend_data (output_bfd); |
| 2438 | size_t dynsize = bed->s->sizeof_dyn; |
| 2439 | bfd_byte *dyncon, *dynconend; |
| 2440 | |
| 2441 | dynconend = sdyn->contents + sdyn->size; |
| 2442 | for (dyncon = sdyn->contents; dyncon < dynconend; dyncon += dynsize) |
| 2443 | { |
| 2444 | Elf_Internal_Dyn dyn; |
| 2445 | asection *s; |
| 2446 | |
| 2447 | bed->s->swap_dyn_in (dynobj, dyncon, &dyn); |
| 2448 | |
| 2449 | switch (dyn.d_tag) |
| 2450 | { |
| 2451 | case DT_PLTGOT: |
| 2452 | s = htab->elf.sgotplt; |
| 2453 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; |
| 2454 | break; |
| 2455 | case DT_JMPREL: |
| 2456 | s = htab->elf.srelplt; |
| 2457 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; |
| 2458 | break; |
| 2459 | case DT_PLTRELSZ: |
| 2460 | s = htab->elf.srelplt; |
| 2461 | dyn.d_un.d_val = s->size; |
| 2462 | break; |
| 2463 | default: |
| 2464 | continue; |
| 2465 | } |
| 2466 | |
| 2467 | bed->s->swap_dyn_out (output_bfd, &dyn, dyncon); |
| 2468 | } |
| 2469 | return TRUE; |
| 2470 | } |
| 2471 | |
| 2472 | static bfd_boolean |
| 2473 | riscv_elf_finish_dynamic_sections (bfd *output_bfd, |
| 2474 | struct bfd_link_info *info) |
| 2475 | { |
| 2476 | bfd *dynobj; |
| 2477 | asection *sdyn; |
| 2478 | struct riscv_elf_link_hash_table *htab; |
| 2479 | |
| 2480 | htab = riscv_elf_hash_table (info); |
| 2481 | BFD_ASSERT (htab != NULL); |
| 2482 | dynobj = htab->elf.dynobj; |
| 2483 | |
| 2484 | sdyn = bfd_get_linker_section (dynobj, ".dynamic"); |
| 2485 | |
| 2486 | if (elf_hash_table (info)->dynamic_sections_created) |
| 2487 | { |
| 2488 | asection *splt; |
| 2489 | bfd_boolean ret; |
| 2490 | |
| 2491 | splt = htab->elf.splt; |
| 2492 | BFD_ASSERT (splt != NULL && sdyn != NULL); |
| 2493 | |
| 2494 | ret = riscv_finish_dyn (output_bfd, info, dynobj, sdyn); |
| 2495 | |
| 2496 | if (ret != TRUE) |
| 2497 | return ret; |
| 2498 | |
| 2499 | /* Fill in the head and tail entries in the procedure linkage table. */ |
| 2500 | if (splt->size > 0) |
| 2501 | { |
| 2502 | int i; |
| 2503 | uint32_t plt_header[PLT_HEADER_INSNS]; |
| 2504 | riscv_make_plt_header (sec_addr (htab->elf.sgotplt), |
| 2505 | sec_addr (splt), plt_header); |
| 2506 | |
| 2507 | for (i = 0; i < PLT_HEADER_INSNS; i++) |
| 2508 | bfd_put_32 (output_bfd, plt_header[i], splt->contents + 4*i); |
| 2509 | |
| 2510 | elf_section_data (splt->output_section)->this_hdr.sh_entsize |
| 2511 | = PLT_ENTRY_SIZE; |
| 2512 | } |
| 2513 | } |
| 2514 | |
| 2515 | if (htab->elf.sgotplt) |
| 2516 | { |
| 2517 | asection *output_section = htab->elf.sgotplt->output_section; |
| 2518 | |
| 2519 | if (bfd_is_abs_section (output_section)) |
| 2520 | { |
| 2521 | (*_bfd_error_handler) |
| 2522 | (_("discarded output section: `%A'"), htab->elf.sgotplt); |
| 2523 | return FALSE; |
| 2524 | } |
| 2525 | |
| 2526 | if (htab->elf.sgotplt->size > 0) |
| 2527 | { |
| 2528 | /* Write the first two entries in .got.plt, needed for the dynamic |
| 2529 | linker. */ |
| 2530 | bfd_put_NN (output_bfd, (bfd_vma) -1, htab->elf.sgotplt->contents); |
| 2531 | bfd_put_NN (output_bfd, (bfd_vma) 0, |
| 2532 | htab->elf.sgotplt->contents + GOT_ENTRY_SIZE); |
| 2533 | } |
| 2534 | |
| 2535 | elf_section_data (output_section)->this_hdr.sh_entsize = GOT_ENTRY_SIZE; |
| 2536 | } |
| 2537 | |
| 2538 | if (htab->elf.sgot) |
| 2539 | { |
| 2540 | asection *output_section = htab->elf.sgot->output_section; |
| 2541 | |
| 2542 | if (htab->elf.sgot->size > 0) |
| 2543 | { |
| 2544 | /* Set the first entry in the global offset table to the address of |
| 2545 | the dynamic section. */ |
| 2546 | bfd_vma val = sdyn ? sec_addr (sdyn) : 0; |
| 2547 | bfd_put_NN (output_bfd, val, htab->elf.sgot->contents); |
| 2548 | } |
| 2549 | |
| 2550 | elf_section_data (output_section)->this_hdr.sh_entsize = GOT_ENTRY_SIZE; |
| 2551 | } |
| 2552 | |
| 2553 | return TRUE; |
| 2554 | } |
| 2555 | |
| 2556 | /* Return address for Ith PLT stub in section PLT, for relocation REL |
| 2557 | or (bfd_vma) -1 if it should not be included. */ |
| 2558 | |
| 2559 | static bfd_vma |
| 2560 | riscv_elf_plt_sym_val (bfd_vma i, const asection *plt, |
| 2561 | const arelent *rel ATTRIBUTE_UNUSED) |
| 2562 | { |
| 2563 | return plt->vma + PLT_HEADER_SIZE + i * PLT_ENTRY_SIZE; |
| 2564 | } |
| 2565 | |
| 2566 | static enum elf_reloc_type_class |
| 2567 | riscv_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 2568 | const asection *rel_sec ATTRIBUTE_UNUSED, |
| 2569 | const Elf_Internal_Rela *rela) |
| 2570 | { |
| 2571 | switch (ELFNN_R_TYPE (rela->r_info)) |
| 2572 | { |
| 2573 | case R_RISCV_RELATIVE: |
| 2574 | return reloc_class_relative; |
| 2575 | case R_RISCV_JUMP_SLOT: |
| 2576 | return reloc_class_plt; |
| 2577 | case R_RISCV_COPY: |
| 2578 | return reloc_class_copy; |
| 2579 | default: |
| 2580 | return reloc_class_normal; |
| 2581 | } |
| 2582 | } |
| 2583 | |
| 2584 | /* Merge backend specific data from an object file to the output |
| 2585 | object file when linking. */ |
| 2586 | |
| 2587 | static bfd_boolean |
| 2588 | _bfd_riscv_elf_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info) |
| 2589 | { |
| 2590 | bfd *obfd = info->output_bfd; |
| 2591 | flagword new_flags = elf_elfheader (ibfd)->e_flags; |
| 2592 | flagword old_flags = elf_elfheader (obfd)->e_flags; |
| 2593 | |
| 2594 | if (!is_riscv_elf (ibfd) || !is_riscv_elf (obfd)) |
| 2595 | return TRUE; |
| 2596 | |
| 2597 | if (strcmp (bfd_get_target (ibfd), bfd_get_target (obfd)) != 0) |
| 2598 | { |
| 2599 | (*_bfd_error_handler) |
| 2600 | (_("%B: ABI is incompatible with that of the selected emulation:\n" |
| 2601 | " target emulation `%s' does not match `%s'"), |
| 2602 | ibfd, bfd_get_target (ibfd), bfd_get_target (obfd)); |
| 2603 | return FALSE; |
| 2604 | } |
| 2605 | |
| 2606 | if (!_bfd_elf_merge_object_attributes (ibfd, info)) |
| 2607 | return FALSE; |
| 2608 | |
| 2609 | if (! elf_flags_init (obfd)) |
| 2610 | { |
| 2611 | elf_flags_init (obfd) = TRUE; |
| 2612 | elf_elfheader (obfd)->e_flags = new_flags; |
| 2613 | return TRUE; |
| 2614 | } |
| 2615 | |
| 2616 | /* Disallow linking different float ABIs. */ |
| 2617 | if ((old_flags ^ new_flags) & EF_RISCV_FLOAT_ABI) |
| 2618 | { |
| 2619 | (*_bfd_error_handler) |
| 2620 | (_("%B: can't link hard-float modules with soft-float modules"), ibfd); |
| 2621 | goto fail; |
| 2622 | } |
| 2623 | |
| 2624 | /* Allow linking RVC and non-RVC, and keep the RVC flag. */ |
| 2625 | elf_elfheader (obfd)->e_flags |= new_flags & EF_RISCV_RVC; |
| 2626 | |
| 2627 | return TRUE; |
| 2628 | |
| 2629 | fail: |
| 2630 | bfd_set_error (bfd_error_bad_value); |
| 2631 | return FALSE; |
| 2632 | } |
| 2633 | |
| 2634 | /* Delete some bytes from a section while relaxing. */ |
| 2635 | |
| 2636 | static bfd_boolean |
| 2637 | riscv_relax_delete_bytes (bfd *abfd, asection *sec, bfd_vma addr, size_t count) |
| 2638 | { |
| 2639 | unsigned int i, symcount; |
| 2640 | bfd_vma toaddr = sec->size; |
| 2641 | struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (abfd); |
| 2642 | Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 2643 | unsigned int sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); |
| 2644 | struct bfd_elf_section_data *data = elf_section_data (sec); |
| 2645 | bfd_byte *contents = data->this_hdr.contents; |
| 2646 | |
| 2647 | /* Actually delete the bytes. */ |
| 2648 | sec->size -= count; |
| 2649 | memmove (contents + addr, contents + addr + count, toaddr - addr - count); |
| 2650 | |
| 2651 | /* Adjust the location of all of the relocs. Note that we need not |
| 2652 | adjust the addends, since all PC-relative references must be against |
| 2653 | symbols, which we will adjust below. */ |
| 2654 | for (i = 0; i < sec->reloc_count; i++) |
| 2655 | if (data->relocs[i].r_offset > addr && data->relocs[i].r_offset < toaddr) |
| 2656 | data->relocs[i].r_offset -= count; |
| 2657 | |
| 2658 | /* Adjust the local symbols defined in this section. */ |
| 2659 | for (i = 0; i < symtab_hdr->sh_info; i++) |
| 2660 | { |
| 2661 | Elf_Internal_Sym *sym = (Elf_Internal_Sym *) symtab_hdr->contents + i; |
| 2662 | if (sym->st_shndx == sec_shndx) |
| 2663 | { |
| 2664 | /* If the symbol is in the range of memory we just moved, we |
| 2665 | have to adjust its value. */ |
| 2666 | if (sym->st_value > addr && sym->st_value <= toaddr) |
| 2667 | sym->st_value -= count; |
| 2668 | |
| 2669 | /* If the symbol *spans* the bytes we just deleted (i.e. its |
| 2670 | *end* is in the moved bytes but its *start* isn't), then we |
| 2671 | must adjust its size. */ |
| 2672 | if (sym->st_value <= addr |
| 2673 | && sym->st_value + sym->st_size > addr |
| 2674 | && sym->st_value + sym->st_size <= toaddr) |
| 2675 | sym->st_size -= count; |
| 2676 | } |
| 2677 | } |
| 2678 | |
| 2679 | /* Now adjust the global symbols defined in this section. */ |
| 2680 | symcount = ((symtab_hdr->sh_size / sizeof (ElfNN_External_Sym)) |
| 2681 | - symtab_hdr->sh_info); |
| 2682 | |
| 2683 | for (i = 0; i < symcount; i++) |
| 2684 | { |
| 2685 | struct elf_link_hash_entry *sym_hash = sym_hashes[i]; |
| 2686 | |
| 2687 | if ((sym_hash->root.type == bfd_link_hash_defined |
| 2688 | || sym_hash->root.type == bfd_link_hash_defweak) |
| 2689 | && sym_hash->root.u.def.section == sec) |
| 2690 | { |
| 2691 | /* As above, adjust the value if needed. */ |
| 2692 | if (sym_hash->root.u.def.value > addr |
| 2693 | && sym_hash->root.u.def.value <= toaddr) |
| 2694 | sym_hash->root.u.def.value -= count; |
| 2695 | |
| 2696 | /* As above, adjust the size if needed. */ |
| 2697 | if (sym_hash->root.u.def.value <= addr |
| 2698 | && sym_hash->root.u.def.value + sym_hash->size > addr |
| 2699 | && sym_hash->root.u.def.value + sym_hash->size <= toaddr) |
| 2700 | sym_hash->size -= count; |
| 2701 | } |
| 2702 | } |
| 2703 | |
| 2704 | return TRUE; |
| 2705 | } |
| 2706 | |
| 2707 | typedef bfd_boolean (*relax_func_t) (bfd *, asection *, asection *, |
| 2708 | struct bfd_link_info *, |
| 2709 | Elf_Internal_Rela *, |
| 2710 | bfd_vma, bfd_vma, bfd_vma, bfd_boolean *); |
| 2711 | |
| 2712 | /* Relax AUIPC + JALR into JAL. */ |
| 2713 | |
| 2714 | static bfd_boolean |
| 2715 | _bfd_riscv_relax_call (bfd *abfd, asection *sec, asection *sym_sec, |
| 2716 | struct bfd_link_info *link_info, |
| 2717 | Elf_Internal_Rela *rel, |
| 2718 | bfd_vma symval, |
| 2719 | bfd_vma max_alignment, |
| 2720 | bfd_vma reserve_size ATTRIBUTE_UNUSED, |
| 2721 | bfd_boolean *again) |
| 2722 | { |
| 2723 | bfd_byte *contents = elf_section_data (sec)->this_hdr.contents; |
| 2724 | bfd_signed_vma foff = symval - (sec_addr (sec) + rel->r_offset); |
| 2725 | bfd_boolean near_zero = (symval + RISCV_IMM_REACH/2) < RISCV_IMM_REACH; |
| 2726 | bfd_vma auipc, jalr; |
| 2727 | int rd, r_type, len = 4, rvc = elf_elfheader (abfd)->e_flags & EF_RISCV_RVC; |
| 2728 | |
| 2729 | /* If the call crosses section boundaries, an alignment directive could |
| 2730 | cause the PC-relative offset to later increase. */ |
| 2731 | if (VALID_UJTYPE_IMM (foff) && sym_sec->output_section != sec->output_section) |
| 2732 | foff += (foff < 0 ? -max_alignment : max_alignment); |
| 2733 | |
| 2734 | /* See if this function call can be shortened. */ |
| 2735 | if (!VALID_UJTYPE_IMM (foff) && !(!bfd_link_pic (link_info) && near_zero)) |
| 2736 | return TRUE; |
| 2737 | |
| 2738 | /* Shorten the function call. */ |
| 2739 | BFD_ASSERT (rel->r_offset + 8 <= sec->size); |
| 2740 | |
| 2741 | auipc = bfd_get_32 (abfd, contents + rel->r_offset); |
| 2742 | jalr = bfd_get_32 (abfd, contents + rel->r_offset + 4); |
| 2743 | rd = (jalr >> OP_SH_RD) & OP_MASK_RD; |
| 2744 | rvc = rvc && VALID_RVC_J_IMM (foff) && ARCH_SIZE == 32; |
| 2745 | |
| 2746 | if (rvc && (rd == 0 || rd == X_RA)) |
| 2747 | { |
| 2748 | /* Relax to C.J[AL] rd, addr. */ |
| 2749 | r_type = R_RISCV_RVC_JUMP; |
| 2750 | auipc = rd == 0 ? MATCH_C_J : MATCH_C_JAL; |
| 2751 | len = 2; |
| 2752 | } |
| 2753 | else if (VALID_UJTYPE_IMM (foff)) |
| 2754 | { |
| 2755 | /* Relax to JAL rd, addr. */ |
| 2756 | r_type = R_RISCV_JAL; |
| 2757 | auipc = MATCH_JAL | (rd << OP_SH_RD); |
| 2758 | } |
| 2759 | else /* near_zero */ |
| 2760 | { |
| 2761 | /* Relax to JALR rd, x0, addr. */ |
| 2762 | r_type = R_RISCV_LO12_I; |
| 2763 | auipc = MATCH_JALR | (rd << OP_SH_RD); |
| 2764 | } |
| 2765 | |
| 2766 | /* Replace the R_RISCV_CALL reloc. */ |
| 2767 | rel->r_info = ELFNN_R_INFO (ELFNN_R_SYM (rel->r_info), r_type); |
| 2768 | /* Replace the AUIPC. */ |
| 2769 | bfd_put (8 * len, abfd, auipc, contents + rel->r_offset); |
| 2770 | |
| 2771 | /* Delete unnecessary JALR. */ |
| 2772 | *again = TRUE; |
| 2773 | return riscv_relax_delete_bytes (abfd, sec, rel->r_offset + len, 8 - len); |
| 2774 | } |
| 2775 | |
| 2776 | /* Traverse all output sections and return the max alignment. */ |
| 2777 | |
| 2778 | static bfd_vma |
| 2779 | _bfd_riscv_get_max_alignment (asection *sec) |
| 2780 | { |
| 2781 | unsigned int max_alignment_power = 0; |
| 2782 | asection *o; |
| 2783 | |
| 2784 | for (o = sec->output_section->owner->sections; o != NULL; o = o->next) |
| 2785 | { |
| 2786 | if (o->alignment_power > max_alignment_power) |
| 2787 | max_alignment_power = o->alignment_power; |
| 2788 | } |
| 2789 | |
| 2790 | return (bfd_vma) 1 << max_alignment_power; |
| 2791 | } |
| 2792 | |
| 2793 | /* Relax non-PIC global variable references. */ |
| 2794 | |
| 2795 | static bfd_boolean |
| 2796 | _bfd_riscv_relax_lui (bfd *abfd, |
| 2797 | asection *sec, |
| 2798 | asection *sym_sec, |
| 2799 | struct bfd_link_info *link_info, |
| 2800 | Elf_Internal_Rela *rel, |
| 2801 | bfd_vma symval, |
| 2802 | bfd_vma max_alignment, |
| 2803 | bfd_vma reserve_size, |
| 2804 | bfd_boolean *again) |
| 2805 | { |
| 2806 | bfd_byte *contents = elf_section_data (sec)->this_hdr.contents; |
| 2807 | bfd_vma gp = riscv_global_pointer_value (link_info); |
| 2808 | int use_rvc = elf_elfheader (abfd)->e_flags & EF_RISCV_RVC; |
| 2809 | |
| 2810 | /* Mergeable symbols and code might later move out of range. */ |
| 2811 | if (sym_sec->flags & (SEC_MERGE | SEC_CODE)) |
| 2812 | return TRUE; |
| 2813 | |
| 2814 | BFD_ASSERT (rel->r_offset + 4 <= sec->size); |
| 2815 | |
| 2816 | if (gp) |
| 2817 | { |
| 2818 | /* If gp and the symbol are in the same output section, then |
| 2819 | consider only that section's alignment. */ |
| 2820 | struct bfd_link_hash_entry *h = |
| 2821 | bfd_link_hash_lookup (link_info->hash, GP_NAME, FALSE, FALSE, TRUE); |
| 2822 | if (h->u.def.section->output_section == sym_sec->output_section) |
| 2823 | max_alignment = (bfd_vma) 1 << sym_sec->output_section->alignment_power; |
| 2824 | } |
| 2825 | |
| 2826 | /* Is the reference in range of x0 or gp? |
| 2827 | Valid gp range conservatively because of alignment issue. */ |
| 2828 | if (VALID_ITYPE_IMM (symval) |
| 2829 | || (symval >= gp |
| 2830 | && VALID_ITYPE_IMM (symval - gp + max_alignment + reserve_size)) |
| 2831 | || (symval < gp |
| 2832 | && VALID_ITYPE_IMM (symval - gp - max_alignment - reserve_size))) |
| 2833 | { |
| 2834 | unsigned sym = ELFNN_R_SYM (rel->r_info); |
| 2835 | switch (ELFNN_R_TYPE (rel->r_info)) |
| 2836 | { |
| 2837 | case R_RISCV_LO12_I: |
| 2838 | rel->r_info = ELFNN_R_INFO (sym, R_RISCV_GPREL_I); |
| 2839 | return TRUE; |
| 2840 | |
| 2841 | case R_RISCV_LO12_S: |
| 2842 | rel->r_info = ELFNN_R_INFO (sym, R_RISCV_GPREL_S); |
| 2843 | return TRUE; |
| 2844 | |
| 2845 | case R_RISCV_HI20: |
| 2846 | /* We can delete the unnecessary LUI and reloc. */ |
| 2847 | rel->r_info = ELFNN_R_INFO (0, R_RISCV_NONE); |
| 2848 | *again = TRUE; |
| 2849 | return riscv_relax_delete_bytes (abfd, sec, rel->r_offset, 4); |
| 2850 | |
| 2851 | default: |
| 2852 | abort (); |
| 2853 | } |
| 2854 | } |
| 2855 | |
| 2856 | /* Can we relax LUI to C.LUI? Alignment might move the section forward; |
| 2857 | account for this assuming page alignment at worst. */ |
| 2858 | if (use_rvc |
| 2859 | && ELFNN_R_TYPE (rel->r_info) == R_RISCV_HI20 |
| 2860 | && VALID_RVC_LUI_IMM (RISCV_CONST_HIGH_PART (symval)) |
| 2861 | && VALID_RVC_LUI_IMM (RISCV_CONST_HIGH_PART (symval + ELF_MAXPAGESIZE))) |
| 2862 | { |
| 2863 | /* Replace LUI with C.LUI if legal (i.e., rd != x2/sp). */ |
| 2864 | bfd_vma lui = bfd_get_32 (abfd, contents + rel->r_offset); |
| 2865 | if (((lui >> OP_SH_RD) & OP_MASK_RD) == X_SP) |
| 2866 | return TRUE; |
| 2867 | |
| 2868 | lui = (lui & (OP_MASK_RD << OP_SH_RD)) | MATCH_C_LUI; |
| 2869 | bfd_put_32 (abfd, lui, contents + rel->r_offset); |
| 2870 | |
| 2871 | /* Replace the R_RISCV_HI20 reloc. */ |
| 2872 | rel->r_info = ELFNN_R_INFO (ELFNN_R_SYM (rel->r_info), R_RISCV_RVC_LUI); |
| 2873 | |
| 2874 | *again = TRUE; |
| 2875 | return riscv_relax_delete_bytes (abfd, sec, rel->r_offset + 2, 2); |
| 2876 | } |
| 2877 | |
| 2878 | return TRUE; |
| 2879 | } |
| 2880 | |
| 2881 | /* Relax non-PIC TLS references. */ |
| 2882 | |
| 2883 | static bfd_boolean |
| 2884 | _bfd_riscv_relax_tls_le (bfd *abfd, |
| 2885 | asection *sec, |
| 2886 | asection *sym_sec ATTRIBUTE_UNUSED, |
| 2887 | struct bfd_link_info *link_info, |
| 2888 | Elf_Internal_Rela *rel, |
| 2889 | bfd_vma symval, |
| 2890 | bfd_vma max_alignment ATTRIBUTE_UNUSED, |
| 2891 | bfd_vma reserve_size ATTRIBUTE_UNUSED, |
| 2892 | bfd_boolean *again) |
| 2893 | { |
| 2894 | /* See if this symbol is in range of tp. */ |
| 2895 | if (RISCV_CONST_HIGH_PART (tpoff (link_info, symval)) != 0) |
| 2896 | return TRUE; |
| 2897 | |
| 2898 | BFD_ASSERT (rel->r_offset + 4 <= sec->size); |
| 2899 | switch (ELFNN_R_TYPE (rel->r_info)) |
| 2900 | { |
| 2901 | case R_RISCV_TPREL_LO12_I: |
| 2902 | rel->r_info = ELFNN_R_INFO (ELFNN_R_SYM (rel->r_info), R_RISCV_TPREL_I); |
| 2903 | return TRUE; |
| 2904 | |
| 2905 | case R_RISCV_TPREL_LO12_S: |
| 2906 | rel->r_info = ELFNN_R_INFO (ELFNN_R_SYM (rel->r_info), R_RISCV_TPREL_S); |
| 2907 | return TRUE; |
| 2908 | |
| 2909 | case R_RISCV_TPREL_HI20: |
| 2910 | case R_RISCV_TPREL_ADD: |
| 2911 | /* We can delete the unnecessary instruction and reloc. */ |
| 2912 | rel->r_info = ELFNN_R_INFO (0, R_RISCV_NONE); |
| 2913 | *again = TRUE; |
| 2914 | return riscv_relax_delete_bytes (abfd, sec, rel->r_offset, 4); |
| 2915 | |
| 2916 | default: |
| 2917 | abort (); |
| 2918 | } |
| 2919 | } |
| 2920 | |
| 2921 | /* Implement R_RISCV_ALIGN by deleting excess alignment NOPs. */ |
| 2922 | |
| 2923 | static bfd_boolean |
| 2924 | _bfd_riscv_relax_align (bfd *abfd, asection *sec, |
| 2925 | asection *sym_sec ATTRIBUTE_UNUSED, |
| 2926 | struct bfd_link_info *link_info ATTRIBUTE_UNUSED, |
| 2927 | Elf_Internal_Rela *rel, |
| 2928 | bfd_vma symval, |
| 2929 | bfd_vma max_alignment ATTRIBUTE_UNUSED, |
| 2930 | bfd_vma reserve_size ATTRIBUTE_UNUSED, |
| 2931 | bfd_boolean *again ATTRIBUTE_UNUSED) |
| 2932 | { |
| 2933 | bfd_byte *contents = elf_section_data (sec)->this_hdr.contents; |
| 2934 | bfd_vma alignment = 1, pos; |
| 2935 | while (alignment <= rel->r_addend) |
| 2936 | alignment *= 2; |
| 2937 | |
| 2938 | symval -= rel->r_addend; |
| 2939 | bfd_vma aligned_addr = ((symval - 1) & ~(alignment - 1)) + alignment; |
| 2940 | bfd_vma nop_bytes = aligned_addr - symval; |
| 2941 | |
| 2942 | /* Once we've handled an R_RISCV_ALIGN, we can't relax anything else. */ |
| 2943 | sec->sec_flg0 = TRUE; |
| 2944 | |
| 2945 | /* Make sure there are enough NOPs to actually achieve the alignment. */ |
| 2946 | if (rel->r_addend < nop_bytes) |
| 2947 | return FALSE; |
| 2948 | |
| 2949 | /* Delete the reloc. */ |
| 2950 | rel->r_info = ELFNN_R_INFO (0, R_RISCV_NONE); |
| 2951 | |
| 2952 | /* If the number of NOPs is already correct, there's nothing to do. */ |
| 2953 | if (nop_bytes == rel->r_addend) |
| 2954 | return TRUE; |
| 2955 | |
| 2956 | /* Write as many RISC-V NOPs as we need. */ |
| 2957 | for (pos = 0; pos < (nop_bytes & -4); pos += 4) |
| 2958 | bfd_put_32 (abfd, RISCV_NOP, contents + rel->r_offset + pos); |
| 2959 | |
| 2960 | /* Write a final RVC NOP if need be. */ |
| 2961 | if (nop_bytes % 4 != 0) |
| 2962 | bfd_put_16 (abfd, RVC_NOP, contents + rel->r_offset + pos); |
| 2963 | |
| 2964 | /* Delete the excess bytes. */ |
| 2965 | return riscv_relax_delete_bytes (abfd, sec, rel->r_offset + nop_bytes, |
| 2966 | rel->r_addend - nop_bytes); |
| 2967 | } |
| 2968 | |
| 2969 | /* Relax a section. Pass 0 shortens code sequences unless disabled. |
| 2970 | Pass 1, which cannot be disabled, handles code alignment directives. */ |
| 2971 | |
| 2972 | static bfd_boolean |
| 2973 | _bfd_riscv_relax_section (bfd *abfd, asection *sec, |
| 2974 | struct bfd_link_info *info, |
| 2975 | bfd_boolean *again) |
| 2976 | { |
| 2977 | Elf_Internal_Shdr *symtab_hdr = &elf_symtab_hdr (abfd); |
| 2978 | struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info); |
| 2979 | struct bfd_elf_section_data *data = elf_section_data (sec); |
| 2980 | Elf_Internal_Rela *relocs; |
| 2981 | bfd_boolean ret = FALSE; |
| 2982 | unsigned int i; |
| 2983 | bfd_vma max_alignment, reserve_size = 0; |
| 2984 | |
| 2985 | *again = FALSE; |
| 2986 | |
| 2987 | if (bfd_link_relocatable (info) |
| 2988 | || sec->sec_flg0 |
| 2989 | || (sec->flags & SEC_RELOC) == 0 |
| 2990 | || sec->reloc_count == 0 |
| 2991 | || (info->disable_target_specific_optimizations |
| 2992 | && info->relax_pass == 0)) |
| 2993 | return TRUE; |
| 2994 | |
| 2995 | /* Read this BFD's relocs if we haven't done so already. */ |
| 2996 | if (data->relocs) |
| 2997 | relocs = data->relocs; |
| 2998 | else if (!(relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, |
| 2999 | info->keep_memory))) |
| 3000 | goto fail; |
| 3001 | |
| 3002 | max_alignment = _bfd_riscv_get_max_alignment (sec); |
| 3003 | |
| 3004 | /* Examine and consider relaxing each reloc. */ |
| 3005 | for (i = 0; i < sec->reloc_count; i++) |
| 3006 | { |
| 3007 | asection *sym_sec; |
| 3008 | Elf_Internal_Rela *rel = relocs + i; |
| 3009 | relax_func_t relax_func; |
| 3010 | int type = ELFNN_R_TYPE (rel->r_info); |
| 3011 | bfd_vma symval; |
| 3012 | |
| 3013 | if (info->relax_pass == 0) |
| 3014 | { |
| 3015 | if (type == R_RISCV_CALL || type == R_RISCV_CALL_PLT) |
| 3016 | relax_func = _bfd_riscv_relax_call; |
| 3017 | else if (type == R_RISCV_HI20 |
| 3018 | || type == R_RISCV_LO12_I |
| 3019 | || type == R_RISCV_LO12_S) |
| 3020 | relax_func = _bfd_riscv_relax_lui; |
| 3021 | else if (type == R_RISCV_TPREL_HI20 |
| 3022 | || type == R_RISCV_TPREL_ADD |
| 3023 | || type == R_RISCV_TPREL_LO12_I |
| 3024 | || type == R_RISCV_TPREL_LO12_S) |
| 3025 | relax_func = _bfd_riscv_relax_tls_le; |
| 3026 | else |
| 3027 | continue; |
| 3028 | |
| 3029 | /* Only relax this reloc if it is paired with R_RISCV_RELAX. */ |
| 3030 | if (i == sec->reloc_count - 1 |
| 3031 | || ELFNN_R_TYPE ((rel + 1)->r_info) != R_RISCV_RELAX |
| 3032 | || rel->r_offset != (rel + 1)->r_offset) |
| 3033 | continue; |
| 3034 | |
| 3035 | /* Skip over the R_RISCV_RELAX. */ |
| 3036 | i++; |
| 3037 | } |
| 3038 | else if (type == R_RISCV_ALIGN) |
| 3039 | relax_func = _bfd_riscv_relax_align; |
| 3040 | else |
| 3041 | continue; |
| 3042 | |
| 3043 | data->relocs = relocs; |
| 3044 | |
| 3045 | /* Read this BFD's contents if we haven't done so already. */ |
| 3046 | if (!data->this_hdr.contents |
| 3047 | && !bfd_malloc_and_get_section (abfd, sec, &data->this_hdr.contents)) |
| 3048 | goto fail; |
| 3049 | |
| 3050 | /* Read this BFD's symbols if we haven't done so already. */ |
| 3051 | if (symtab_hdr->sh_info != 0 |
| 3052 | && !symtab_hdr->contents |
| 3053 | && !(symtab_hdr->contents = |
| 3054 | (unsigned char *) bfd_elf_get_elf_syms (abfd, symtab_hdr, |
| 3055 | symtab_hdr->sh_info, |
| 3056 | 0, NULL, NULL, NULL))) |
| 3057 | goto fail; |
| 3058 | |
| 3059 | /* Get the value of the symbol referred to by the reloc. */ |
| 3060 | if (ELFNN_R_SYM (rel->r_info) < symtab_hdr->sh_info) |
| 3061 | { |
| 3062 | /* A local symbol. */ |
| 3063 | Elf_Internal_Sym *isym = ((Elf_Internal_Sym *) symtab_hdr->contents |
| 3064 | + ELFNN_R_SYM (rel->r_info)); |
| 3065 | reserve_size = (isym->st_size - rel->r_addend) > isym->st_size |
| 3066 | ? 0 : isym->st_size - rel->r_addend; |
| 3067 | |
| 3068 | if (isym->st_shndx == SHN_UNDEF) |
| 3069 | sym_sec = sec, symval = sec_addr (sec) + rel->r_offset; |
| 3070 | else |
| 3071 | { |
| 3072 | BFD_ASSERT (isym->st_shndx < elf_numsections (abfd)); |
| 3073 | sym_sec = elf_elfsections (abfd)[isym->st_shndx]->bfd_section; |
| 3074 | if (sec_addr (sym_sec) == 0) |
| 3075 | continue; |
| 3076 | symval = sec_addr (sym_sec) + isym->st_value; |
| 3077 | } |
| 3078 | } |
| 3079 | else |
| 3080 | { |
| 3081 | unsigned long indx; |
| 3082 | struct elf_link_hash_entry *h; |
| 3083 | |
| 3084 | indx = ELFNN_R_SYM (rel->r_info) - symtab_hdr->sh_info; |
| 3085 | h = elf_sym_hashes (abfd)[indx]; |
| 3086 | |
| 3087 | while (h->root.type == bfd_link_hash_indirect |
| 3088 | || h->root.type == bfd_link_hash_warning) |
| 3089 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 3090 | |
| 3091 | if (h->plt.offset != MINUS_ONE) |
| 3092 | symval = sec_addr (htab->elf.splt) + h->plt.offset; |
| 3093 | else if (h->root.u.def.section->output_section == NULL |
| 3094 | || (h->root.type != bfd_link_hash_defined |
| 3095 | && h->root.type != bfd_link_hash_defweak)) |
| 3096 | continue; |
| 3097 | else |
| 3098 | symval = sec_addr (h->root.u.def.section) + h->root.u.def.value; |
| 3099 | |
| 3100 | if (h->type != STT_FUNC) |
| 3101 | reserve_size = |
| 3102 | (h->size - rel->r_addend) > h->size ? 0 : h->size - rel->r_addend; |
| 3103 | sym_sec = h->root.u.def.section; |
| 3104 | } |
| 3105 | |
| 3106 | symval += rel->r_addend; |
| 3107 | |
| 3108 | if (!relax_func (abfd, sec, sym_sec, info, rel, symval, |
| 3109 | max_alignment, reserve_size, again)) |
| 3110 | goto fail; |
| 3111 | } |
| 3112 | |
| 3113 | ret = TRUE; |
| 3114 | |
| 3115 | fail: |
| 3116 | if (relocs != data->relocs) |
| 3117 | free (relocs); |
| 3118 | |
| 3119 | return ret; |
| 3120 | } |
| 3121 | |
| 3122 | #if ARCH_SIZE == 32 |
| 3123 | # define PRSTATUS_SIZE 0 /* FIXME */ |
| 3124 | # define PRSTATUS_OFFSET_PR_CURSIG 12 |
| 3125 | # define PRSTATUS_OFFSET_PR_PID 24 |
| 3126 | # define PRSTATUS_OFFSET_PR_REG 72 |
| 3127 | # define ELF_GREGSET_T_SIZE 128 |
| 3128 | # define PRPSINFO_SIZE 128 |
| 3129 | # define PRPSINFO_OFFSET_PR_PID 16 |
| 3130 | # define PRPSINFO_OFFSET_PR_FNAME 32 |
| 3131 | # define PRPSINFO_OFFSET_PR_PSARGS 48 |
| 3132 | #else |
| 3133 | # define PRSTATUS_SIZE 376 |
| 3134 | # define PRSTATUS_OFFSET_PR_CURSIG 12 |
| 3135 | # define PRSTATUS_OFFSET_PR_PID 32 |
| 3136 | # define PRSTATUS_OFFSET_PR_REG 112 |
| 3137 | # define ELF_GREGSET_T_SIZE 256 |
| 3138 | # define PRPSINFO_SIZE 136 |
| 3139 | # define PRPSINFO_OFFSET_PR_PID 24 |
| 3140 | # define PRPSINFO_OFFSET_PR_FNAME 40 |
| 3141 | # define PRPSINFO_OFFSET_PR_PSARGS 56 |
| 3142 | #endif |
| 3143 | |
| 3144 | /* Support for core dump NOTE sections. */ |
| 3145 | |
| 3146 | static bfd_boolean |
| 3147 | riscv_elf_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) |
| 3148 | { |
| 3149 | switch (note->descsz) |
| 3150 | { |
| 3151 | default: |
| 3152 | return FALSE; |
| 3153 | |
| 3154 | case PRSTATUS_SIZE: /* sizeof(struct elf_prstatus) on Linux/RISC-V. */ |
| 3155 | /* pr_cursig */ |
| 3156 | elf_tdata (abfd)->core->signal |
| 3157 | = bfd_get_16 (abfd, note->descdata + PRSTATUS_OFFSET_PR_CURSIG); |
| 3158 | |
| 3159 | /* pr_pid */ |
| 3160 | elf_tdata (abfd)->core->lwpid |
| 3161 | = bfd_get_32 (abfd, note->descdata + PRSTATUS_OFFSET_PR_PID); |
| 3162 | break; |
| 3163 | } |
| 3164 | |
| 3165 | /* Make a ".reg/999" section. */ |
| 3166 | return _bfd_elfcore_make_pseudosection (abfd, ".reg", ELF_GREGSET_T_SIZE, |
| 3167 | note->descpos + PRSTATUS_OFFSET_PR_REG); |
| 3168 | } |
| 3169 | |
| 3170 | static bfd_boolean |
| 3171 | riscv_elf_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) |
| 3172 | { |
| 3173 | switch (note->descsz) |
| 3174 | { |
| 3175 | default: |
| 3176 | return FALSE; |
| 3177 | |
| 3178 | case PRPSINFO_SIZE: /* sizeof(struct elf_prpsinfo) on Linux/RISC-V. */ |
| 3179 | /* pr_pid */ |
| 3180 | elf_tdata (abfd)->core->pid |
| 3181 | = bfd_get_32 (abfd, note->descdata + PRPSINFO_OFFSET_PR_PID); |
| 3182 | |
| 3183 | /* pr_fname */ |
| 3184 | elf_tdata (abfd)->core->program = _bfd_elfcore_strndup |
| 3185 | (abfd, note->descdata + PRPSINFO_OFFSET_PR_FNAME, 16); |
| 3186 | |
| 3187 | /* pr_psargs */ |
| 3188 | elf_tdata (abfd)->core->command = _bfd_elfcore_strndup |
| 3189 | (abfd, note->descdata + PRPSINFO_OFFSET_PR_PSARGS, 80); |
| 3190 | break; |
| 3191 | } |
| 3192 | |
| 3193 | /* Note that for some reason, a spurious space is tacked |
| 3194 | onto the end of the args in some (at least one anyway) |
| 3195 | implementations, so strip it off if it exists. */ |
| 3196 | |
| 3197 | { |
| 3198 | char *command = elf_tdata (abfd)->core->command; |
| 3199 | int n = strlen (command); |
| 3200 | |
| 3201 | if (0 < n && command[n - 1] == ' ') |
| 3202 | command[n - 1] = '\0'; |
| 3203 | } |
| 3204 | |
| 3205 | return TRUE; |
| 3206 | } |
| 3207 | |
| 3208 | /* Set the right mach type. */ |
| 3209 | static bfd_boolean |
| 3210 | riscv_elf_object_p (bfd *abfd) |
| 3211 | { |
| 3212 | /* There are only two mach types in RISCV currently. */ |
| 3213 | if (strcmp (abfd->xvec->name, "elf32-littleriscv") == 0) |
| 3214 | bfd_default_set_arch_mach (abfd, bfd_arch_riscv, bfd_mach_riscv32); |
| 3215 | else |
| 3216 | bfd_default_set_arch_mach (abfd, bfd_arch_riscv, bfd_mach_riscv64); |
| 3217 | |
| 3218 | return TRUE; |
| 3219 | } |
| 3220 | |
| 3221 | |
| 3222 | #define TARGET_LITTLE_SYM riscv_elfNN_vec |
| 3223 | #define TARGET_LITTLE_NAME "elfNN-littleriscv" |
| 3224 | |
| 3225 | #define elf_backend_reloc_type_class riscv_reloc_type_class |
| 3226 | |
| 3227 | #define bfd_elfNN_bfd_reloc_name_lookup riscv_reloc_name_lookup |
| 3228 | #define bfd_elfNN_bfd_link_hash_table_create riscv_elf_link_hash_table_create |
| 3229 | #define bfd_elfNN_bfd_reloc_type_lookup riscv_reloc_type_lookup |
| 3230 | #define bfd_elfNN_bfd_merge_private_bfd_data \ |
| 3231 | _bfd_riscv_elf_merge_private_bfd_data |
| 3232 | |
| 3233 | #define elf_backend_copy_indirect_symbol riscv_elf_copy_indirect_symbol |
| 3234 | #define elf_backend_create_dynamic_sections riscv_elf_create_dynamic_sections |
| 3235 | #define elf_backend_check_relocs riscv_elf_check_relocs |
| 3236 | #define elf_backend_adjust_dynamic_symbol riscv_elf_adjust_dynamic_symbol |
| 3237 | #define elf_backend_size_dynamic_sections riscv_elf_size_dynamic_sections |
| 3238 | #define elf_backend_relocate_section riscv_elf_relocate_section |
| 3239 | #define elf_backend_finish_dynamic_symbol riscv_elf_finish_dynamic_symbol |
| 3240 | #define elf_backend_finish_dynamic_sections riscv_elf_finish_dynamic_sections |
| 3241 | #define elf_backend_gc_mark_hook riscv_elf_gc_mark_hook |
| 3242 | #define elf_backend_gc_sweep_hook riscv_elf_gc_sweep_hook |
| 3243 | #define elf_backend_plt_sym_val riscv_elf_plt_sym_val |
| 3244 | #define elf_backend_grok_prstatus riscv_elf_grok_prstatus |
| 3245 | #define elf_backend_grok_psinfo riscv_elf_grok_psinfo |
| 3246 | #define elf_backend_object_p riscv_elf_object_p |
| 3247 | #define elf_info_to_howto_rel NULL |
| 3248 | #define elf_info_to_howto riscv_info_to_howto_rela |
| 3249 | #define bfd_elfNN_bfd_relax_section _bfd_riscv_relax_section |
| 3250 | |
| 3251 | #define elf_backend_init_index_section _bfd_elf_init_1_index_section |
| 3252 | |
| 3253 | #define elf_backend_can_gc_sections 1 |
| 3254 | #define elf_backend_can_refcount 1 |
| 3255 | #define elf_backend_want_got_plt 1 |
| 3256 | #define elf_backend_plt_readonly 1 |
| 3257 | #define elf_backend_plt_alignment 4 |
| 3258 | #define elf_backend_want_plt_sym 1 |
| 3259 | #define elf_backend_got_header_size (ARCH_SIZE / 8) |
| 3260 | #define elf_backend_want_dynrelro 1 |
| 3261 | #define elf_backend_rela_normal 1 |
| 3262 | #define elf_backend_default_execstack 0 |
| 3263 | |
| 3264 | #include "elfNN-target.h" |