| 1 | /* RISC-V-specific support for NN-bit ELF. |
| 2 | Copyright (C) 2011-2020 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 | /* Internal relocations used exclusively by the relaxation pass. */ |
| 36 | #define R_RISCV_DELETE (R_RISCV_max + 1) |
| 37 | |
| 38 | #define ARCH_SIZE NN |
| 39 | |
| 40 | #define MINUS_ONE ((bfd_vma)0 - 1) |
| 41 | |
| 42 | #define RISCV_ELF_LOG_WORD_BYTES (ARCH_SIZE == 32 ? 2 : 3) |
| 43 | |
| 44 | #define RISCV_ELF_WORD_BYTES (1 << RISCV_ELF_LOG_WORD_BYTES) |
| 45 | |
| 46 | /* The name of the dynamic interpreter. This is put in the .interp |
| 47 | section. */ |
| 48 | |
| 49 | #define ELF64_DYNAMIC_INTERPRETER "/lib/ld.so.1" |
| 50 | #define ELF32_DYNAMIC_INTERPRETER "/lib32/ld.so.1" |
| 51 | |
| 52 | #define ELF_ARCH bfd_arch_riscv |
| 53 | #define ELF_TARGET_ID RISCV_ELF_DATA |
| 54 | #define ELF_MACHINE_CODE EM_RISCV |
| 55 | #define ELF_MAXPAGESIZE 0x1000 |
| 56 | #define ELF_COMMONPAGESIZE 0x1000 |
| 57 | |
| 58 | /* RISC-V ELF linker hash entry. */ |
| 59 | |
| 60 | struct riscv_elf_link_hash_entry |
| 61 | { |
| 62 | struct elf_link_hash_entry elf; |
| 63 | |
| 64 | /* Track dynamic relocs copied for this symbol. */ |
| 65 | struct elf_dyn_relocs *dyn_relocs; |
| 66 | |
| 67 | #define GOT_UNKNOWN 0 |
| 68 | #define GOT_NORMAL 1 |
| 69 | #define GOT_TLS_GD 2 |
| 70 | #define GOT_TLS_IE 4 |
| 71 | #define GOT_TLS_LE 8 |
| 72 | char tls_type; |
| 73 | }; |
| 74 | |
| 75 | #define riscv_elf_hash_entry(ent) \ |
| 76 | ((struct riscv_elf_link_hash_entry *)(ent)) |
| 77 | |
| 78 | struct _bfd_riscv_elf_obj_tdata |
| 79 | { |
| 80 | struct elf_obj_tdata root; |
| 81 | |
| 82 | /* tls_type for each local got entry. */ |
| 83 | char *local_got_tls_type; |
| 84 | }; |
| 85 | |
| 86 | #define _bfd_riscv_elf_tdata(abfd) \ |
| 87 | ((struct _bfd_riscv_elf_obj_tdata *) (abfd)->tdata.any) |
| 88 | |
| 89 | #define _bfd_riscv_elf_local_got_tls_type(abfd) \ |
| 90 | (_bfd_riscv_elf_tdata (abfd)->local_got_tls_type) |
| 91 | |
| 92 | #define _bfd_riscv_elf_tls_type(abfd, h, symndx) \ |
| 93 | (*((h) != NULL ? &riscv_elf_hash_entry (h)->tls_type \ |
| 94 | : &_bfd_riscv_elf_local_got_tls_type (abfd) [symndx])) |
| 95 | |
| 96 | #define is_riscv_elf(bfd) \ |
| 97 | (bfd_get_flavour (bfd) == bfd_target_elf_flavour \ |
| 98 | && elf_tdata (bfd) != NULL \ |
| 99 | && elf_object_id (bfd) == RISCV_ELF_DATA) |
| 100 | |
| 101 | #include "elf/common.h" |
| 102 | #include "elf/internal.h" |
| 103 | |
| 104 | struct riscv_elf_link_hash_table |
| 105 | { |
| 106 | struct elf_link_hash_table elf; |
| 107 | |
| 108 | /* Short-cuts to get to dynamic linker sections. */ |
| 109 | asection *sdyntdata; |
| 110 | |
| 111 | /* Small local sym to section mapping cache. */ |
| 112 | struct sym_cache sym_cache; |
| 113 | |
| 114 | /* The max alignment of output sections. */ |
| 115 | bfd_vma max_alignment; |
| 116 | }; |
| 117 | |
| 118 | |
| 119 | /* Get the RISC-V ELF linker hash table from a link_info structure. */ |
| 120 | #define riscv_elf_hash_table(p) \ |
| 121 | (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \ |
| 122 | == RISCV_ELF_DATA ? ((struct riscv_elf_link_hash_table *) ((p)->hash)) : NULL) |
| 123 | |
| 124 | static bfd_boolean |
| 125 | riscv_info_to_howto_rela (bfd *abfd, |
| 126 | arelent *cache_ptr, |
| 127 | Elf_Internal_Rela *dst) |
| 128 | { |
| 129 | cache_ptr->howto = riscv_elf_rtype_to_howto (abfd, ELFNN_R_TYPE (dst->r_info)); |
| 130 | return cache_ptr->howto != NULL; |
| 131 | } |
| 132 | |
| 133 | static void |
| 134 | riscv_elf_append_rela (bfd *abfd, asection *s, Elf_Internal_Rela *rel) |
| 135 | { |
| 136 | const struct elf_backend_data *bed; |
| 137 | bfd_byte *loc; |
| 138 | |
| 139 | bed = get_elf_backend_data (abfd); |
| 140 | loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rela); |
| 141 | bed->s->swap_reloca_out (abfd, rel, loc); |
| 142 | } |
| 143 | |
| 144 | /* PLT/GOT stuff. */ |
| 145 | |
| 146 | #define PLT_HEADER_INSNS 8 |
| 147 | #define PLT_ENTRY_INSNS 4 |
| 148 | #define PLT_HEADER_SIZE (PLT_HEADER_INSNS * 4) |
| 149 | #define PLT_ENTRY_SIZE (PLT_ENTRY_INSNS * 4) |
| 150 | |
| 151 | #define GOT_ENTRY_SIZE RISCV_ELF_WORD_BYTES |
| 152 | |
| 153 | #define GOTPLT_HEADER_SIZE (2 * GOT_ENTRY_SIZE) |
| 154 | |
| 155 | #define sec_addr(sec) ((sec)->output_section->vma + (sec)->output_offset) |
| 156 | |
| 157 | static bfd_vma |
| 158 | riscv_elf_got_plt_val (bfd_vma plt_index, struct bfd_link_info *info) |
| 159 | { |
| 160 | return sec_addr (riscv_elf_hash_table (info)->elf.sgotplt) |
| 161 | + GOTPLT_HEADER_SIZE + (plt_index * GOT_ENTRY_SIZE); |
| 162 | } |
| 163 | |
| 164 | #if ARCH_SIZE == 32 |
| 165 | # define MATCH_LREG MATCH_LW |
| 166 | #else |
| 167 | # define MATCH_LREG MATCH_LD |
| 168 | #endif |
| 169 | |
| 170 | /* Generate a PLT header. */ |
| 171 | |
| 172 | static bfd_boolean |
| 173 | riscv_make_plt_header (bfd *output_bfd, bfd_vma gotplt_addr, bfd_vma addr, |
| 174 | uint32_t *entry) |
| 175 | { |
| 176 | bfd_vma gotplt_offset_high = RISCV_PCREL_HIGH_PART (gotplt_addr, addr); |
| 177 | bfd_vma gotplt_offset_low = RISCV_PCREL_LOW_PART (gotplt_addr, addr); |
| 178 | |
| 179 | /* RVE has no t3 register, so this won't work, and is not supported. */ |
| 180 | if (elf_elfheader (output_bfd)->e_flags & EF_RISCV_RVE) |
| 181 | { |
| 182 | _bfd_error_handler (_("%pB: warning: RVE PLT generation not supported"), |
| 183 | output_bfd); |
| 184 | return FALSE; |
| 185 | } |
| 186 | |
| 187 | /* auipc t2, %hi(.got.plt) |
| 188 | sub t1, t1, t3 # shifted .got.plt offset + hdr size + 12 |
| 189 | l[w|d] t3, %lo(.got.plt)(t2) # _dl_runtime_resolve |
| 190 | addi t1, t1, -(hdr size + 12) # shifted .got.plt offset |
| 191 | addi t0, t2, %lo(.got.plt) # &.got.plt |
| 192 | srli t1, t1, log2(16/PTRSIZE) # .got.plt offset |
| 193 | l[w|d] t0, PTRSIZE(t0) # link map |
| 194 | jr t3 */ |
| 195 | |
| 196 | entry[0] = RISCV_UTYPE (AUIPC, X_T2, gotplt_offset_high); |
| 197 | entry[1] = RISCV_RTYPE (SUB, X_T1, X_T1, X_T3); |
| 198 | entry[2] = RISCV_ITYPE (LREG, X_T3, X_T2, gotplt_offset_low); |
| 199 | entry[3] = RISCV_ITYPE (ADDI, X_T1, X_T1, -(PLT_HEADER_SIZE + 12)); |
| 200 | entry[4] = RISCV_ITYPE (ADDI, X_T0, X_T2, gotplt_offset_low); |
| 201 | entry[5] = RISCV_ITYPE (SRLI, X_T1, X_T1, 4 - RISCV_ELF_LOG_WORD_BYTES); |
| 202 | entry[6] = RISCV_ITYPE (LREG, X_T0, X_T0, RISCV_ELF_WORD_BYTES); |
| 203 | entry[7] = RISCV_ITYPE (JALR, 0, X_T3, 0); |
| 204 | |
| 205 | return TRUE; |
| 206 | } |
| 207 | |
| 208 | /* Generate a PLT entry. */ |
| 209 | |
| 210 | static bfd_boolean |
| 211 | riscv_make_plt_entry (bfd *output_bfd, bfd_vma got, bfd_vma addr, |
| 212 | uint32_t *entry) |
| 213 | { |
| 214 | /* RVE has no t3 register, so this won't work, and is not supported. */ |
| 215 | if (elf_elfheader (output_bfd)->e_flags & EF_RISCV_RVE) |
| 216 | { |
| 217 | _bfd_error_handler (_("%pB: warning: RVE PLT generation not supported"), |
| 218 | output_bfd); |
| 219 | return FALSE; |
| 220 | } |
| 221 | |
| 222 | /* auipc t3, %hi(.got.plt entry) |
| 223 | l[w|d] t3, %lo(.got.plt entry)(t3) |
| 224 | jalr t1, t3 |
| 225 | nop */ |
| 226 | |
| 227 | entry[0] = RISCV_UTYPE (AUIPC, X_T3, RISCV_PCREL_HIGH_PART (got, addr)); |
| 228 | entry[1] = RISCV_ITYPE (LREG, X_T3, X_T3, RISCV_PCREL_LOW_PART (got, addr)); |
| 229 | entry[2] = RISCV_ITYPE (JALR, X_T1, X_T3, 0); |
| 230 | entry[3] = RISCV_NOP; |
| 231 | |
| 232 | return TRUE; |
| 233 | } |
| 234 | |
| 235 | /* Create an entry in an RISC-V ELF linker hash table. */ |
| 236 | |
| 237 | static struct bfd_hash_entry * |
| 238 | link_hash_newfunc (struct bfd_hash_entry *entry, |
| 239 | struct bfd_hash_table *table, const char *string) |
| 240 | { |
| 241 | /* Allocate the structure if it has not already been allocated by a |
| 242 | subclass. */ |
| 243 | if (entry == NULL) |
| 244 | { |
| 245 | entry = |
| 246 | bfd_hash_allocate (table, |
| 247 | sizeof (struct riscv_elf_link_hash_entry)); |
| 248 | if (entry == NULL) |
| 249 | return entry; |
| 250 | } |
| 251 | |
| 252 | /* Call the allocation method of the superclass. */ |
| 253 | entry = _bfd_elf_link_hash_newfunc (entry, table, string); |
| 254 | if (entry != NULL) |
| 255 | { |
| 256 | struct riscv_elf_link_hash_entry *eh; |
| 257 | |
| 258 | eh = (struct riscv_elf_link_hash_entry *) entry; |
| 259 | eh->dyn_relocs = NULL; |
| 260 | eh->tls_type = GOT_UNKNOWN; |
| 261 | } |
| 262 | |
| 263 | return entry; |
| 264 | } |
| 265 | |
| 266 | /* Create a RISC-V ELF linker hash table. */ |
| 267 | |
| 268 | static struct bfd_link_hash_table * |
| 269 | riscv_elf_link_hash_table_create (bfd *abfd) |
| 270 | { |
| 271 | struct riscv_elf_link_hash_table *ret; |
| 272 | bfd_size_type amt = sizeof (struct riscv_elf_link_hash_table); |
| 273 | |
| 274 | ret = (struct riscv_elf_link_hash_table *) bfd_zmalloc (amt); |
| 275 | if (ret == NULL) |
| 276 | return NULL; |
| 277 | |
| 278 | if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc, |
| 279 | sizeof (struct riscv_elf_link_hash_entry), |
| 280 | RISCV_ELF_DATA)) |
| 281 | { |
| 282 | free (ret); |
| 283 | return NULL; |
| 284 | } |
| 285 | |
| 286 | ret->max_alignment = (bfd_vma) -1; |
| 287 | return &ret->elf.root; |
| 288 | } |
| 289 | |
| 290 | /* Create the .got section. */ |
| 291 | |
| 292 | static bfd_boolean |
| 293 | riscv_elf_create_got_section (bfd *abfd, struct bfd_link_info *info) |
| 294 | { |
| 295 | flagword flags; |
| 296 | asection *s, *s_got; |
| 297 | struct elf_link_hash_entry *h; |
| 298 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 299 | struct elf_link_hash_table *htab = elf_hash_table (info); |
| 300 | |
| 301 | /* This function may be called more than once. */ |
| 302 | if (htab->sgot != NULL) |
| 303 | return TRUE; |
| 304 | |
| 305 | flags = bed->dynamic_sec_flags; |
| 306 | |
| 307 | s = bfd_make_section_anyway_with_flags (abfd, |
| 308 | (bed->rela_plts_and_copies_p |
| 309 | ? ".rela.got" : ".rel.got"), |
| 310 | (bed->dynamic_sec_flags |
| 311 | | SEC_READONLY)); |
| 312 | if (s == NULL |
| 313 | || !bfd_set_section_alignment (s, bed->s->log_file_align)) |
| 314 | return FALSE; |
| 315 | htab->srelgot = s; |
| 316 | |
| 317 | s = s_got = bfd_make_section_anyway_with_flags (abfd, ".got", flags); |
| 318 | if (s == NULL |
| 319 | || !bfd_set_section_alignment (s, bed->s->log_file_align)) |
| 320 | return FALSE; |
| 321 | htab->sgot = s; |
| 322 | |
| 323 | /* The first bit of the global offset table is the header. */ |
| 324 | s->size += bed->got_header_size; |
| 325 | |
| 326 | if (bed->want_got_plt) |
| 327 | { |
| 328 | s = bfd_make_section_anyway_with_flags (abfd, ".got.plt", flags); |
| 329 | if (s == NULL |
| 330 | || !bfd_set_section_alignment (s, bed->s->log_file_align)) |
| 331 | return FALSE; |
| 332 | htab->sgotplt = s; |
| 333 | |
| 334 | /* Reserve room for the header. */ |
| 335 | s->size += GOTPLT_HEADER_SIZE; |
| 336 | } |
| 337 | |
| 338 | if (bed->want_got_sym) |
| 339 | { |
| 340 | /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got |
| 341 | section. We don't do this in the linker script because we don't want |
| 342 | to define the symbol if we are not creating a global offset |
| 343 | table. */ |
| 344 | h = _bfd_elf_define_linkage_sym (abfd, info, s_got, |
| 345 | "_GLOBAL_OFFSET_TABLE_"); |
| 346 | elf_hash_table (info)->hgot = h; |
| 347 | if (h == NULL) |
| 348 | return FALSE; |
| 349 | } |
| 350 | |
| 351 | return TRUE; |
| 352 | } |
| 353 | |
| 354 | /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and |
| 355 | .rela.bss sections in DYNOBJ, and set up shortcuts to them in our |
| 356 | hash table. */ |
| 357 | |
| 358 | static bfd_boolean |
| 359 | riscv_elf_create_dynamic_sections (bfd *dynobj, |
| 360 | struct bfd_link_info *info) |
| 361 | { |
| 362 | struct riscv_elf_link_hash_table *htab; |
| 363 | |
| 364 | htab = riscv_elf_hash_table (info); |
| 365 | BFD_ASSERT (htab != NULL); |
| 366 | |
| 367 | if (!riscv_elf_create_got_section (dynobj, info)) |
| 368 | return FALSE; |
| 369 | |
| 370 | if (!_bfd_elf_create_dynamic_sections (dynobj, info)) |
| 371 | return FALSE; |
| 372 | |
| 373 | if (!bfd_link_pic (info)) |
| 374 | { |
| 375 | /* Technically, this section doesn't have contents. It is used as the |
| 376 | target of TLS copy relocs, to copy TLS data from shared libraries into |
| 377 | the executable. However, if we don't mark it as loadable, then it |
| 378 | matches the IS_TBSS test in ldlang.c, and there is no run-time address |
| 379 | space allocated for it even though it has SEC_ALLOC. That test is |
| 380 | correct for .tbss, but not correct for this section. There is also |
| 381 | a second problem that having a section with no contents can only work |
| 382 | if it comes after all sections with contents in the same segment, |
| 383 | but the linker script does not guarantee that. This is just mixed in |
| 384 | with other .tdata.* sections. We can fix both problems by lying and |
| 385 | saying that there are contents. This section is expected to be small |
| 386 | so this should not cause a significant extra program startup cost. */ |
| 387 | htab->sdyntdata = |
| 388 | bfd_make_section_anyway_with_flags (dynobj, ".tdata.dyn", |
| 389 | (SEC_ALLOC | SEC_THREAD_LOCAL |
| 390 | | SEC_LOAD | SEC_DATA |
| 391 | | SEC_HAS_CONTENTS |
| 392 | | SEC_LINKER_CREATED)); |
| 393 | } |
| 394 | |
| 395 | if (!htab->elf.splt || !htab->elf.srelplt || !htab->elf.sdynbss |
| 396 | || (!bfd_link_pic (info) && (!htab->elf.srelbss || !htab->sdyntdata))) |
| 397 | abort (); |
| 398 | |
| 399 | return TRUE; |
| 400 | } |
| 401 | |
| 402 | /* Copy the extra info we tack onto an elf_link_hash_entry. */ |
| 403 | |
| 404 | static void |
| 405 | riscv_elf_copy_indirect_symbol (struct bfd_link_info *info, |
| 406 | struct elf_link_hash_entry *dir, |
| 407 | struct elf_link_hash_entry *ind) |
| 408 | { |
| 409 | struct riscv_elf_link_hash_entry *edir, *eind; |
| 410 | |
| 411 | edir = (struct riscv_elf_link_hash_entry *) dir; |
| 412 | eind = (struct riscv_elf_link_hash_entry *) ind; |
| 413 | |
| 414 | if (eind->dyn_relocs != NULL) |
| 415 | { |
| 416 | if (edir->dyn_relocs != NULL) |
| 417 | { |
| 418 | struct elf_dyn_relocs **pp; |
| 419 | struct elf_dyn_relocs *p; |
| 420 | |
| 421 | /* Add reloc counts against the indirect sym to the direct sym |
| 422 | list. Merge any entries against the same section. */ |
| 423 | for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) |
| 424 | { |
| 425 | struct elf_dyn_relocs *q; |
| 426 | |
| 427 | for (q = edir->dyn_relocs; q != NULL; q = q->next) |
| 428 | if (q->sec == p->sec) |
| 429 | { |
| 430 | q->pc_count += p->pc_count; |
| 431 | q->count += p->count; |
| 432 | *pp = p->next; |
| 433 | break; |
| 434 | } |
| 435 | if (q == NULL) |
| 436 | pp = &p->next; |
| 437 | } |
| 438 | *pp = edir->dyn_relocs; |
| 439 | } |
| 440 | |
| 441 | edir->dyn_relocs = eind->dyn_relocs; |
| 442 | eind->dyn_relocs = NULL; |
| 443 | } |
| 444 | |
| 445 | if (ind->root.type == bfd_link_hash_indirect |
| 446 | && dir->got.refcount <= 0) |
| 447 | { |
| 448 | edir->tls_type = eind->tls_type; |
| 449 | eind->tls_type = GOT_UNKNOWN; |
| 450 | } |
| 451 | _bfd_elf_link_hash_copy_indirect (info, dir, ind); |
| 452 | } |
| 453 | |
| 454 | static bfd_boolean |
| 455 | riscv_elf_record_tls_type (bfd *abfd, struct elf_link_hash_entry *h, |
| 456 | unsigned long symndx, char tls_type) |
| 457 | { |
| 458 | char *new_tls_type = &_bfd_riscv_elf_tls_type (abfd, h, symndx); |
| 459 | |
| 460 | *new_tls_type |= tls_type; |
| 461 | if ((*new_tls_type & GOT_NORMAL) && (*new_tls_type & ~GOT_NORMAL)) |
| 462 | { |
| 463 | (*_bfd_error_handler) |
| 464 | (_("%pB: `%s' accessed both as normal and thread local symbol"), |
| 465 | abfd, h ? h->root.root.string : "<local>"); |
| 466 | return FALSE; |
| 467 | } |
| 468 | return TRUE; |
| 469 | } |
| 470 | |
| 471 | static bfd_boolean |
| 472 | riscv_elf_record_got_reference (bfd *abfd, struct bfd_link_info *info, |
| 473 | struct elf_link_hash_entry *h, long symndx) |
| 474 | { |
| 475 | struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info); |
| 476 | Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 477 | |
| 478 | if (htab->elf.sgot == NULL) |
| 479 | { |
| 480 | if (!riscv_elf_create_got_section (htab->elf.dynobj, info)) |
| 481 | return FALSE; |
| 482 | } |
| 483 | |
| 484 | if (h != NULL) |
| 485 | { |
| 486 | h->got.refcount += 1; |
| 487 | return TRUE; |
| 488 | } |
| 489 | |
| 490 | /* This is a global offset table entry for a local symbol. */ |
| 491 | if (elf_local_got_refcounts (abfd) == NULL) |
| 492 | { |
| 493 | bfd_size_type size = symtab_hdr->sh_info * (sizeof (bfd_vma) + 1); |
| 494 | if (!(elf_local_got_refcounts (abfd) = bfd_zalloc (abfd, size))) |
| 495 | return FALSE; |
| 496 | _bfd_riscv_elf_local_got_tls_type (abfd) |
| 497 | = (char *) (elf_local_got_refcounts (abfd) + symtab_hdr->sh_info); |
| 498 | } |
| 499 | elf_local_got_refcounts (abfd) [symndx] += 1; |
| 500 | |
| 501 | return TRUE; |
| 502 | } |
| 503 | |
| 504 | static bfd_boolean |
| 505 | bad_static_reloc (bfd *abfd, unsigned r_type, struct elf_link_hash_entry *h) |
| 506 | { |
| 507 | reloc_howto_type * r = riscv_elf_rtype_to_howto (abfd, r_type); |
| 508 | |
| 509 | (*_bfd_error_handler) |
| 510 | (_("%pB: relocation %s against `%s' can not be used when making a shared " |
| 511 | "object; recompile with -fPIC"), |
| 512 | abfd, r ? r->name : _("<unknown>"), |
| 513 | h != NULL ? h->root.root.string : "a local symbol"); |
| 514 | bfd_set_error (bfd_error_bad_value); |
| 515 | return FALSE; |
| 516 | } |
| 517 | /* Look through the relocs for a section during the first phase, and |
| 518 | allocate space in the global offset table or procedure linkage |
| 519 | table. */ |
| 520 | |
| 521 | static bfd_boolean |
| 522 | riscv_elf_check_relocs (bfd *abfd, struct bfd_link_info *info, |
| 523 | asection *sec, const Elf_Internal_Rela *relocs) |
| 524 | { |
| 525 | struct riscv_elf_link_hash_table *htab; |
| 526 | Elf_Internal_Shdr *symtab_hdr; |
| 527 | struct elf_link_hash_entry **sym_hashes; |
| 528 | const Elf_Internal_Rela *rel; |
| 529 | asection *sreloc = NULL; |
| 530 | |
| 531 | if (bfd_link_relocatable (info)) |
| 532 | return TRUE; |
| 533 | |
| 534 | htab = riscv_elf_hash_table (info); |
| 535 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 536 | sym_hashes = elf_sym_hashes (abfd); |
| 537 | |
| 538 | if (htab->elf.dynobj == NULL) |
| 539 | htab->elf.dynobj = abfd; |
| 540 | |
| 541 | for (rel = relocs; rel < relocs + sec->reloc_count; rel++) |
| 542 | { |
| 543 | unsigned int r_type; |
| 544 | unsigned int r_symndx; |
| 545 | struct elf_link_hash_entry *h; |
| 546 | |
| 547 | r_symndx = ELFNN_R_SYM (rel->r_info); |
| 548 | r_type = ELFNN_R_TYPE (rel->r_info); |
| 549 | |
| 550 | if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) |
| 551 | { |
| 552 | (*_bfd_error_handler) (_("%pB: bad symbol index: %d"), |
| 553 | abfd, r_symndx); |
| 554 | return FALSE; |
| 555 | } |
| 556 | |
| 557 | if (r_symndx < symtab_hdr->sh_info) |
| 558 | h = NULL; |
| 559 | else |
| 560 | { |
| 561 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 562 | while (h->root.type == bfd_link_hash_indirect |
| 563 | || h->root.type == bfd_link_hash_warning) |
| 564 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 565 | } |
| 566 | |
| 567 | switch (r_type) |
| 568 | { |
| 569 | case R_RISCV_TLS_GD_HI20: |
| 570 | if (!riscv_elf_record_got_reference (abfd, info, h, r_symndx) |
| 571 | || !riscv_elf_record_tls_type (abfd, h, r_symndx, GOT_TLS_GD)) |
| 572 | return FALSE; |
| 573 | break; |
| 574 | |
| 575 | case R_RISCV_TLS_GOT_HI20: |
| 576 | if (bfd_link_pic (info)) |
| 577 | info->flags |= DF_STATIC_TLS; |
| 578 | if (!riscv_elf_record_got_reference (abfd, info, h, r_symndx) |
| 579 | || !riscv_elf_record_tls_type (abfd, h, r_symndx, GOT_TLS_IE)) |
| 580 | return FALSE; |
| 581 | break; |
| 582 | |
| 583 | case R_RISCV_GOT_HI20: |
| 584 | if (!riscv_elf_record_got_reference (abfd, info, h, r_symndx) |
| 585 | || !riscv_elf_record_tls_type (abfd, h, r_symndx, GOT_NORMAL)) |
| 586 | return FALSE; |
| 587 | break; |
| 588 | |
| 589 | case R_RISCV_CALL_PLT: |
| 590 | /* This symbol requires a procedure linkage table entry. We |
| 591 | actually build the entry in adjust_dynamic_symbol, |
| 592 | because this might be a case of linking PIC code without |
| 593 | linking in any dynamic objects, in which case we don't |
| 594 | need to generate a procedure linkage table after all. */ |
| 595 | |
| 596 | if (h != NULL) |
| 597 | { |
| 598 | h->needs_plt = 1; |
| 599 | h->plt.refcount += 1; |
| 600 | } |
| 601 | break; |
| 602 | |
| 603 | case R_RISCV_CALL: |
| 604 | case R_RISCV_JAL: |
| 605 | case R_RISCV_BRANCH: |
| 606 | case R_RISCV_RVC_BRANCH: |
| 607 | case R_RISCV_RVC_JUMP: |
| 608 | case R_RISCV_PCREL_HI20: |
| 609 | /* In shared libraries, these relocs are known to bind locally. */ |
| 610 | if (bfd_link_pic (info)) |
| 611 | break; |
| 612 | goto static_reloc; |
| 613 | |
| 614 | case R_RISCV_TPREL_HI20: |
| 615 | if (!bfd_link_executable (info)) |
| 616 | return bad_static_reloc (abfd, r_type, h); |
| 617 | if (h != NULL) |
| 618 | riscv_elf_record_tls_type (abfd, h, r_symndx, GOT_TLS_LE); |
| 619 | goto static_reloc; |
| 620 | |
| 621 | case R_RISCV_HI20: |
| 622 | if (bfd_link_pic (info)) |
| 623 | return bad_static_reloc (abfd, r_type, h); |
| 624 | /* Fall through. */ |
| 625 | |
| 626 | case R_RISCV_COPY: |
| 627 | case R_RISCV_JUMP_SLOT: |
| 628 | case R_RISCV_RELATIVE: |
| 629 | case R_RISCV_64: |
| 630 | case R_RISCV_32: |
| 631 | /* Fall through. */ |
| 632 | |
| 633 | static_reloc: |
| 634 | /* This reloc might not bind locally. */ |
| 635 | if (h != NULL) |
| 636 | h->non_got_ref = 1; |
| 637 | |
| 638 | if (h != NULL && !bfd_link_pic (info)) |
| 639 | { |
| 640 | /* We may need a .plt entry if the function this reloc |
| 641 | refers to is in a shared lib. */ |
| 642 | h->plt.refcount += 1; |
| 643 | } |
| 644 | |
| 645 | /* If we are creating a shared library, and this is a reloc |
| 646 | against a global symbol, or a non PC relative reloc |
| 647 | against a local symbol, then we need to copy the reloc |
| 648 | into the shared library. However, if we are linking with |
| 649 | -Bsymbolic, we do not need to copy a reloc against a |
| 650 | global symbol which is defined in an object we are |
| 651 | including in the link (i.e., DEF_REGULAR is set). At |
| 652 | this point we have not seen all the input files, so it is |
| 653 | possible that DEF_REGULAR is not set now but will be set |
| 654 | later (it is never cleared). In case of a weak definition, |
| 655 | DEF_REGULAR may be cleared later by a strong definition in |
| 656 | a shared library. We account for that possibility below by |
| 657 | storing information in the relocs_copied field of the hash |
| 658 | table entry. A similar situation occurs when creating |
| 659 | shared libraries and symbol visibility changes render the |
| 660 | symbol local. |
| 661 | |
| 662 | If on the other hand, we are creating an executable, we |
| 663 | may need to keep relocations for symbols satisfied by a |
| 664 | dynamic library if we manage to avoid copy relocs for the |
| 665 | symbol. */ |
| 666 | reloc_howto_type * r = riscv_elf_rtype_to_howto (abfd, r_type); |
| 667 | |
| 668 | if ((bfd_link_pic (info) |
| 669 | && (sec->flags & SEC_ALLOC) != 0 |
| 670 | && ((r != NULL && ! r->pc_relative) |
| 671 | || (h != NULL |
| 672 | && (! info->symbolic |
| 673 | || h->root.type == bfd_link_hash_defweak |
| 674 | || !h->def_regular)))) |
| 675 | || (!bfd_link_pic (info) |
| 676 | && (sec->flags & SEC_ALLOC) != 0 |
| 677 | && h != NULL |
| 678 | && (h->root.type == bfd_link_hash_defweak |
| 679 | || !h->def_regular))) |
| 680 | { |
| 681 | struct elf_dyn_relocs *p; |
| 682 | struct elf_dyn_relocs **head; |
| 683 | |
| 684 | /* When creating a shared object, we must copy these |
| 685 | relocs into the output file. We create a reloc |
| 686 | section in dynobj and make room for the reloc. */ |
| 687 | if (sreloc == NULL) |
| 688 | { |
| 689 | sreloc = _bfd_elf_make_dynamic_reloc_section |
| 690 | (sec, htab->elf.dynobj, RISCV_ELF_LOG_WORD_BYTES, |
| 691 | abfd, /*rela?*/ TRUE); |
| 692 | |
| 693 | if (sreloc == NULL) |
| 694 | return FALSE; |
| 695 | } |
| 696 | |
| 697 | /* If this is a global symbol, we count the number of |
| 698 | relocations we need for this symbol. */ |
| 699 | if (h != NULL) |
| 700 | head = &((struct riscv_elf_link_hash_entry *) h)->dyn_relocs; |
| 701 | else |
| 702 | { |
| 703 | /* Track dynamic relocs needed for local syms too. |
| 704 | We really need local syms available to do this |
| 705 | easily. Oh well. */ |
| 706 | |
| 707 | asection *s; |
| 708 | void *vpp; |
| 709 | Elf_Internal_Sym *isym; |
| 710 | |
| 711 | isym = bfd_sym_from_r_symndx (&htab->sym_cache, |
| 712 | abfd, r_symndx); |
| 713 | if (isym == NULL) |
| 714 | return FALSE; |
| 715 | |
| 716 | s = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| 717 | if (s == NULL) |
| 718 | s = sec; |
| 719 | |
| 720 | vpp = &elf_section_data (s)->local_dynrel; |
| 721 | head = (struct elf_dyn_relocs **) vpp; |
| 722 | } |
| 723 | |
| 724 | p = *head; |
| 725 | if (p == NULL || p->sec != sec) |
| 726 | { |
| 727 | bfd_size_type amt = sizeof *p; |
| 728 | p = ((struct elf_dyn_relocs *) |
| 729 | bfd_alloc (htab->elf.dynobj, amt)); |
| 730 | if (p == NULL) |
| 731 | return FALSE; |
| 732 | p->next = *head; |
| 733 | *head = p; |
| 734 | p->sec = sec; |
| 735 | p->count = 0; |
| 736 | p->pc_count = 0; |
| 737 | } |
| 738 | |
| 739 | p->count += 1; |
| 740 | p->pc_count += r == NULL ? 0 : r->pc_relative; |
| 741 | } |
| 742 | |
| 743 | break; |
| 744 | |
| 745 | case R_RISCV_GNU_VTINHERIT: |
| 746 | if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) |
| 747 | return FALSE; |
| 748 | break; |
| 749 | |
| 750 | case R_RISCV_GNU_VTENTRY: |
| 751 | if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) |
| 752 | return FALSE; |
| 753 | break; |
| 754 | |
| 755 | default: |
| 756 | break; |
| 757 | } |
| 758 | } |
| 759 | |
| 760 | return TRUE; |
| 761 | } |
| 762 | |
| 763 | static asection * |
| 764 | riscv_elf_gc_mark_hook (asection *sec, |
| 765 | struct bfd_link_info *info, |
| 766 | Elf_Internal_Rela *rel, |
| 767 | struct elf_link_hash_entry *h, |
| 768 | Elf_Internal_Sym *sym) |
| 769 | { |
| 770 | if (h != NULL) |
| 771 | switch (ELFNN_R_TYPE (rel->r_info)) |
| 772 | { |
| 773 | case R_RISCV_GNU_VTINHERIT: |
| 774 | case R_RISCV_GNU_VTENTRY: |
| 775 | return NULL; |
| 776 | } |
| 777 | |
| 778 | return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); |
| 779 | } |
| 780 | |
| 781 | /* Find dynamic relocs for H that apply to read-only sections. */ |
| 782 | |
| 783 | static asection * |
| 784 | readonly_dynrelocs (struct elf_link_hash_entry *h) |
| 785 | { |
| 786 | struct elf_dyn_relocs *p; |
| 787 | |
| 788 | for (p = riscv_elf_hash_entry (h)->dyn_relocs; p != NULL; p = p->next) |
| 789 | { |
| 790 | asection *s = p->sec->output_section; |
| 791 | |
| 792 | if (s != NULL && (s->flags & SEC_READONLY) != 0) |
| 793 | return p->sec; |
| 794 | } |
| 795 | return NULL; |
| 796 | } |
| 797 | |
| 798 | /* Adjust a symbol defined by a dynamic object and referenced by a |
| 799 | regular object. The current definition is in some section of the |
| 800 | dynamic object, but we're not including those sections. We have to |
| 801 | change the definition to something the rest of the link can |
| 802 | understand. */ |
| 803 | |
| 804 | static bfd_boolean |
| 805 | riscv_elf_adjust_dynamic_symbol (struct bfd_link_info *info, |
| 806 | struct elf_link_hash_entry *h) |
| 807 | { |
| 808 | struct riscv_elf_link_hash_table *htab; |
| 809 | struct riscv_elf_link_hash_entry * eh; |
| 810 | bfd *dynobj; |
| 811 | asection *s, *srel; |
| 812 | |
| 813 | htab = riscv_elf_hash_table (info); |
| 814 | BFD_ASSERT (htab != NULL); |
| 815 | |
| 816 | dynobj = htab->elf.dynobj; |
| 817 | |
| 818 | /* Make sure we know what is going on here. */ |
| 819 | BFD_ASSERT (dynobj != NULL |
| 820 | && (h->needs_plt |
| 821 | || h->type == STT_GNU_IFUNC |
| 822 | || h->is_weakalias |
| 823 | || (h->def_dynamic |
| 824 | && h->ref_regular |
| 825 | && !h->def_regular))); |
| 826 | |
| 827 | /* If this is a function, put it in the procedure linkage table. We |
| 828 | will fill in the contents of the procedure linkage table later |
| 829 | (although we could actually do it here). */ |
| 830 | if (h->type == STT_FUNC || h->type == STT_GNU_IFUNC || h->needs_plt) |
| 831 | { |
| 832 | if (h->plt.refcount <= 0 |
| 833 | || SYMBOL_CALLS_LOCAL (info, h) |
| 834 | || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT |
| 835 | && h->root.type == bfd_link_hash_undefweak)) |
| 836 | { |
| 837 | /* This case can occur if we saw a R_RISCV_CALL_PLT reloc in an |
| 838 | input file, but the symbol was never referred to by a dynamic |
| 839 | object, or if all references were garbage collected. In such |
| 840 | a case, we don't actually need to build a PLT entry. */ |
| 841 | h->plt.offset = (bfd_vma) -1; |
| 842 | h->needs_plt = 0; |
| 843 | } |
| 844 | |
| 845 | return TRUE; |
| 846 | } |
| 847 | else |
| 848 | h->plt.offset = (bfd_vma) -1; |
| 849 | |
| 850 | /* If this is a weak symbol, and there is a real definition, the |
| 851 | processor independent code will have arranged for us to see the |
| 852 | real definition first, and we can just use the same value. */ |
| 853 | if (h->is_weakalias) |
| 854 | { |
| 855 | struct elf_link_hash_entry *def = weakdef (h); |
| 856 | BFD_ASSERT (def->root.type == bfd_link_hash_defined); |
| 857 | h->root.u.def.section = def->root.u.def.section; |
| 858 | h->root.u.def.value = def->root.u.def.value; |
| 859 | return TRUE; |
| 860 | } |
| 861 | |
| 862 | /* This is a reference to a symbol defined by a dynamic object which |
| 863 | is not a function. */ |
| 864 | |
| 865 | /* If we are creating a shared library, we must presume that the |
| 866 | only references to the symbol are via the global offset table. |
| 867 | For such cases we need not do anything here; the relocations will |
| 868 | be handled correctly by relocate_section. */ |
| 869 | if (bfd_link_pic (info)) |
| 870 | return TRUE; |
| 871 | |
| 872 | /* If there are no references to this symbol that do not use the |
| 873 | GOT, we don't need to generate a copy reloc. */ |
| 874 | if (!h->non_got_ref) |
| 875 | return TRUE; |
| 876 | |
| 877 | /* If -z nocopyreloc was given, we won't generate them either. */ |
| 878 | if (info->nocopyreloc) |
| 879 | { |
| 880 | h->non_got_ref = 0; |
| 881 | return TRUE; |
| 882 | } |
| 883 | |
| 884 | /* If we don't find any dynamic relocs in read-only sections, then |
| 885 | we'll be keeping the dynamic relocs and avoiding the copy reloc. */ |
| 886 | if (!readonly_dynrelocs (h)) |
| 887 | { |
| 888 | h->non_got_ref = 0; |
| 889 | return TRUE; |
| 890 | } |
| 891 | |
| 892 | /* We must allocate the symbol in our .dynbss section, which will |
| 893 | become part of the .bss section of the executable. There will be |
| 894 | an entry for this symbol in the .dynsym section. The dynamic |
| 895 | object will contain position independent code, so all references |
| 896 | from the dynamic object to this symbol will go through the global |
| 897 | offset table. The dynamic linker will use the .dynsym entry to |
| 898 | determine the address it must put in the global offset table, so |
| 899 | both the dynamic object and the regular object will refer to the |
| 900 | same memory location for the variable. */ |
| 901 | |
| 902 | /* We must generate a R_RISCV_COPY reloc to tell the dynamic linker |
| 903 | to copy the initial value out of the dynamic object and into the |
| 904 | runtime process image. We need to remember the offset into the |
| 905 | .rel.bss section we are going to use. */ |
| 906 | eh = (struct riscv_elf_link_hash_entry *) h; |
| 907 | if (eh->tls_type & ~GOT_NORMAL) |
| 908 | { |
| 909 | s = htab->sdyntdata; |
| 910 | srel = htab->elf.srelbss; |
| 911 | } |
| 912 | else if ((h->root.u.def.section->flags & SEC_READONLY) != 0) |
| 913 | { |
| 914 | s = htab->elf.sdynrelro; |
| 915 | srel = htab->elf.sreldynrelro; |
| 916 | } |
| 917 | else |
| 918 | { |
| 919 | s = htab->elf.sdynbss; |
| 920 | srel = htab->elf.srelbss; |
| 921 | } |
| 922 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) |
| 923 | { |
| 924 | srel->size += sizeof (ElfNN_External_Rela); |
| 925 | h->needs_copy = 1; |
| 926 | } |
| 927 | |
| 928 | return _bfd_elf_adjust_dynamic_copy (info, h, s); |
| 929 | } |
| 930 | |
| 931 | /* Allocate space in .plt, .got and associated reloc sections for |
| 932 | dynamic relocs. */ |
| 933 | |
| 934 | static bfd_boolean |
| 935 | allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) |
| 936 | { |
| 937 | struct bfd_link_info *info; |
| 938 | struct riscv_elf_link_hash_table *htab; |
| 939 | struct riscv_elf_link_hash_entry *eh; |
| 940 | struct elf_dyn_relocs *p; |
| 941 | |
| 942 | if (h->root.type == bfd_link_hash_indirect) |
| 943 | return TRUE; |
| 944 | |
| 945 | info = (struct bfd_link_info *) inf; |
| 946 | htab = riscv_elf_hash_table (info); |
| 947 | BFD_ASSERT (htab != NULL); |
| 948 | |
| 949 | if (htab->elf.dynamic_sections_created |
| 950 | && h->plt.refcount > 0) |
| 951 | { |
| 952 | /* Make sure this symbol is output as a dynamic symbol. |
| 953 | Undefined weak syms won't yet be marked as dynamic. */ |
| 954 | if (h->dynindx == -1 |
| 955 | && !h->forced_local) |
| 956 | { |
| 957 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 958 | return FALSE; |
| 959 | } |
| 960 | |
| 961 | if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, bfd_link_pic (info), h)) |
| 962 | { |
| 963 | asection *s = htab->elf.splt; |
| 964 | |
| 965 | if (s->size == 0) |
| 966 | s->size = PLT_HEADER_SIZE; |
| 967 | |
| 968 | h->plt.offset = s->size; |
| 969 | |
| 970 | /* Make room for this entry. */ |
| 971 | s->size += PLT_ENTRY_SIZE; |
| 972 | |
| 973 | /* We also need to make an entry in the .got.plt section. */ |
| 974 | htab->elf.sgotplt->size += GOT_ENTRY_SIZE; |
| 975 | |
| 976 | /* We also need to make an entry in the .rela.plt section. */ |
| 977 | htab->elf.srelplt->size += sizeof (ElfNN_External_Rela); |
| 978 | |
| 979 | /* If this symbol is not defined in a regular file, and we are |
| 980 | not generating a shared library, then set the symbol to this |
| 981 | location in the .plt. This is required to make function |
| 982 | pointers compare as equal between the normal executable and |
| 983 | the shared library. */ |
| 984 | if (! bfd_link_pic (info) |
| 985 | && !h->def_regular) |
| 986 | { |
| 987 | h->root.u.def.section = s; |
| 988 | h->root.u.def.value = h->plt.offset; |
| 989 | } |
| 990 | } |
| 991 | else |
| 992 | { |
| 993 | h->plt.offset = (bfd_vma) -1; |
| 994 | h->needs_plt = 0; |
| 995 | } |
| 996 | } |
| 997 | else |
| 998 | { |
| 999 | h->plt.offset = (bfd_vma) -1; |
| 1000 | h->needs_plt = 0; |
| 1001 | } |
| 1002 | |
| 1003 | if (h->got.refcount > 0) |
| 1004 | { |
| 1005 | asection *s; |
| 1006 | bfd_boolean dyn; |
| 1007 | int tls_type = riscv_elf_hash_entry (h)->tls_type; |
| 1008 | |
| 1009 | /* Make sure this symbol is output as a dynamic symbol. |
| 1010 | Undefined weak syms won't yet be marked as dynamic. */ |
| 1011 | if (h->dynindx == -1 |
| 1012 | && !h->forced_local) |
| 1013 | { |
| 1014 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 1015 | return FALSE; |
| 1016 | } |
| 1017 | |
| 1018 | s = htab->elf.sgot; |
| 1019 | h->got.offset = s->size; |
| 1020 | dyn = htab->elf.dynamic_sections_created; |
| 1021 | if (tls_type & (GOT_TLS_GD | GOT_TLS_IE)) |
| 1022 | { |
| 1023 | /* TLS_GD needs two dynamic relocs and two GOT slots. */ |
| 1024 | if (tls_type & GOT_TLS_GD) |
| 1025 | { |
| 1026 | s->size += 2 * RISCV_ELF_WORD_BYTES; |
| 1027 | htab->elf.srelgot->size += 2 * sizeof (ElfNN_External_Rela); |
| 1028 | } |
| 1029 | |
| 1030 | /* TLS_IE needs one dynamic reloc and one GOT slot. */ |
| 1031 | if (tls_type & GOT_TLS_IE) |
| 1032 | { |
| 1033 | s->size += RISCV_ELF_WORD_BYTES; |
| 1034 | htab->elf.srelgot->size += sizeof (ElfNN_External_Rela); |
| 1035 | } |
| 1036 | } |
| 1037 | else |
| 1038 | { |
| 1039 | s->size += RISCV_ELF_WORD_BYTES; |
| 1040 | if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, bfd_link_pic (info), h) |
| 1041 | && ! UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)) |
| 1042 | htab->elf.srelgot->size += sizeof (ElfNN_External_Rela); |
| 1043 | } |
| 1044 | } |
| 1045 | else |
| 1046 | h->got.offset = (bfd_vma) -1; |
| 1047 | |
| 1048 | eh = (struct riscv_elf_link_hash_entry *) h; |
| 1049 | if (eh->dyn_relocs == NULL) |
| 1050 | return TRUE; |
| 1051 | |
| 1052 | /* In the shared -Bsymbolic case, discard space allocated for |
| 1053 | dynamic pc-relative relocs against symbols which turn out to be |
| 1054 | defined in regular objects. For the normal shared case, discard |
| 1055 | space for pc-relative relocs that have become local due to symbol |
| 1056 | visibility changes. */ |
| 1057 | |
| 1058 | if (bfd_link_pic (info)) |
| 1059 | { |
| 1060 | if (SYMBOL_CALLS_LOCAL (info, h)) |
| 1061 | { |
| 1062 | struct elf_dyn_relocs **pp; |
| 1063 | |
| 1064 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) |
| 1065 | { |
| 1066 | p->count -= p->pc_count; |
| 1067 | p->pc_count = 0; |
| 1068 | if (p->count == 0) |
| 1069 | *pp = p->next; |
| 1070 | else |
| 1071 | pp = &p->next; |
| 1072 | } |
| 1073 | } |
| 1074 | |
| 1075 | /* Also discard relocs on undefined weak syms with non-default |
| 1076 | visibility. */ |
| 1077 | if (eh->dyn_relocs != NULL |
| 1078 | && h->root.type == bfd_link_hash_undefweak) |
| 1079 | { |
| 1080 | if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT |
| 1081 | || UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)) |
| 1082 | eh->dyn_relocs = NULL; |
| 1083 | |
| 1084 | /* Make sure undefined weak symbols are output as a dynamic |
| 1085 | symbol in PIEs. */ |
| 1086 | else if (h->dynindx == -1 |
| 1087 | && !h->forced_local) |
| 1088 | { |
| 1089 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 1090 | return FALSE; |
| 1091 | } |
| 1092 | } |
| 1093 | } |
| 1094 | else |
| 1095 | { |
| 1096 | /* For the non-shared case, discard space for relocs against |
| 1097 | symbols which turn out to need copy relocs or are not |
| 1098 | dynamic. */ |
| 1099 | |
| 1100 | if (!h->non_got_ref |
| 1101 | && ((h->def_dynamic |
| 1102 | && !h->def_regular) |
| 1103 | || (htab->elf.dynamic_sections_created |
| 1104 | && (h->root.type == bfd_link_hash_undefweak |
| 1105 | || h->root.type == bfd_link_hash_undefined)))) |
| 1106 | { |
| 1107 | /* Make sure this symbol is output as a dynamic symbol. |
| 1108 | Undefined weak syms won't yet be marked as dynamic. */ |
| 1109 | if (h->dynindx == -1 |
| 1110 | && !h->forced_local) |
| 1111 | { |
| 1112 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 1113 | return FALSE; |
| 1114 | } |
| 1115 | |
| 1116 | /* If that succeeded, we know we'll be keeping all the |
| 1117 | relocs. */ |
| 1118 | if (h->dynindx != -1) |
| 1119 | goto keep; |
| 1120 | } |
| 1121 | |
| 1122 | eh->dyn_relocs = NULL; |
| 1123 | |
| 1124 | keep: ; |
| 1125 | } |
| 1126 | |
| 1127 | /* Finally, allocate space. */ |
| 1128 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 1129 | { |
| 1130 | asection *sreloc = elf_section_data (p->sec)->sreloc; |
| 1131 | sreloc->size += p->count * sizeof (ElfNN_External_Rela); |
| 1132 | } |
| 1133 | |
| 1134 | return TRUE; |
| 1135 | } |
| 1136 | |
| 1137 | /* Set DF_TEXTREL if we find any dynamic relocs that apply to |
| 1138 | read-only sections. */ |
| 1139 | |
| 1140 | static bfd_boolean |
| 1141 | maybe_set_textrel (struct elf_link_hash_entry *h, void *info_p) |
| 1142 | { |
| 1143 | asection *sec; |
| 1144 | |
| 1145 | if (h->root.type == bfd_link_hash_indirect) |
| 1146 | return TRUE; |
| 1147 | |
| 1148 | sec = readonly_dynrelocs (h); |
| 1149 | if (sec != NULL) |
| 1150 | { |
| 1151 | struct bfd_link_info *info = (struct bfd_link_info *) info_p; |
| 1152 | |
| 1153 | info->flags |= DF_TEXTREL; |
| 1154 | info->callbacks->minfo |
| 1155 | (_("%pB: dynamic relocation against `%pT' in read-only section `%pA'\n"), |
| 1156 | sec->owner, h->root.root.string, sec); |
| 1157 | |
| 1158 | /* Not an error, just cut short the traversal. */ |
| 1159 | return FALSE; |
| 1160 | } |
| 1161 | return TRUE; |
| 1162 | } |
| 1163 | |
| 1164 | static bfd_boolean |
| 1165 | riscv_elf_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) |
| 1166 | { |
| 1167 | struct riscv_elf_link_hash_table *htab; |
| 1168 | bfd *dynobj; |
| 1169 | asection *s; |
| 1170 | bfd *ibfd; |
| 1171 | |
| 1172 | htab = riscv_elf_hash_table (info); |
| 1173 | BFD_ASSERT (htab != NULL); |
| 1174 | dynobj = htab->elf.dynobj; |
| 1175 | BFD_ASSERT (dynobj != NULL); |
| 1176 | |
| 1177 | if (elf_hash_table (info)->dynamic_sections_created) |
| 1178 | { |
| 1179 | /* Set the contents of the .interp section to the interpreter. */ |
| 1180 | if (bfd_link_executable (info) && !info->nointerp) |
| 1181 | { |
| 1182 | s = bfd_get_linker_section (dynobj, ".interp"); |
| 1183 | BFD_ASSERT (s != NULL); |
| 1184 | s->size = strlen (ELFNN_DYNAMIC_INTERPRETER) + 1; |
| 1185 | s->contents = (unsigned char *) ELFNN_DYNAMIC_INTERPRETER; |
| 1186 | } |
| 1187 | } |
| 1188 | |
| 1189 | /* Set up .got offsets for local syms, and space for local dynamic |
| 1190 | relocs. */ |
| 1191 | for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next) |
| 1192 | { |
| 1193 | bfd_signed_vma *local_got; |
| 1194 | bfd_signed_vma *end_local_got; |
| 1195 | char *local_tls_type; |
| 1196 | bfd_size_type locsymcount; |
| 1197 | Elf_Internal_Shdr *symtab_hdr; |
| 1198 | asection *srel; |
| 1199 | |
| 1200 | if (! is_riscv_elf (ibfd)) |
| 1201 | continue; |
| 1202 | |
| 1203 | for (s = ibfd->sections; s != NULL; s = s->next) |
| 1204 | { |
| 1205 | struct elf_dyn_relocs *p; |
| 1206 | |
| 1207 | for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next) |
| 1208 | { |
| 1209 | if (!bfd_is_abs_section (p->sec) |
| 1210 | && bfd_is_abs_section (p->sec->output_section)) |
| 1211 | { |
| 1212 | /* Input section has been discarded, either because |
| 1213 | it is a copy of a linkonce section or due to |
| 1214 | linker script /DISCARD/, so we'll be discarding |
| 1215 | the relocs too. */ |
| 1216 | } |
| 1217 | else if (p->count != 0) |
| 1218 | { |
| 1219 | srel = elf_section_data (p->sec)->sreloc; |
| 1220 | srel->size += p->count * sizeof (ElfNN_External_Rela); |
| 1221 | if ((p->sec->output_section->flags & SEC_READONLY) != 0) |
| 1222 | info->flags |= DF_TEXTREL; |
| 1223 | } |
| 1224 | } |
| 1225 | } |
| 1226 | |
| 1227 | local_got = elf_local_got_refcounts (ibfd); |
| 1228 | if (!local_got) |
| 1229 | continue; |
| 1230 | |
| 1231 | symtab_hdr = &elf_symtab_hdr (ibfd); |
| 1232 | locsymcount = symtab_hdr->sh_info; |
| 1233 | end_local_got = local_got + locsymcount; |
| 1234 | local_tls_type = _bfd_riscv_elf_local_got_tls_type (ibfd); |
| 1235 | s = htab->elf.sgot; |
| 1236 | srel = htab->elf.srelgot; |
| 1237 | for (; local_got < end_local_got; ++local_got, ++local_tls_type) |
| 1238 | { |
| 1239 | if (*local_got > 0) |
| 1240 | { |
| 1241 | *local_got = s->size; |
| 1242 | s->size += RISCV_ELF_WORD_BYTES; |
| 1243 | if (*local_tls_type & GOT_TLS_GD) |
| 1244 | s->size += RISCV_ELF_WORD_BYTES; |
| 1245 | if (bfd_link_pic (info) |
| 1246 | || (*local_tls_type & (GOT_TLS_GD | GOT_TLS_IE))) |
| 1247 | srel->size += sizeof (ElfNN_External_Rela); |
| 1248 | } |
| 1249 | else |
| 1250 | *local_got = (bfd_vma) -1; |
| 1251 | } |
| 1252 | } |
| 1253 | |
| 1254 | /* Allocate global sym .plt and .got entries, and space for global |
| 1255 | sym dynamic relocs. */ |
| 1256 | elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info); |
| 1257 | |
| 1258 | if (htab->elf.sgotplt) |
| 1259 | { |
| 1260 | struct elf_link_hash_entry *got; |
| 1261 | got = elf_link_hash_lookup (elf_hash_table (info), |
| 1262 | "_GLOBAL_OFFSET_TABLE_", |
| 1263 | FALSE, FALSE, FALSE); |
| 1264 | |
| 1265 | /* Don't allocate .got.plt section if there are no GOT nor PLT |
| 1266 | entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */ |
| 1267 | if ((got == NULL |
| 1268 | || !got->ref_regular_nonweak) |
| 1269 | && (htab->elf.sgotplt->size == GOTPLT_HEADER_SIZE) |
| 1270 | && (htab->elf.splt == NULL |
| 1271 | || htab->elf.splt->size == 0) |
| 1272 | && (htab->elf.sgot == NULL |
| 1273 | || (htab->elf.sgot->size |
| 1274 | == get_elf_backend_data (output_bfd)->got_header_size))) |
| 1275 | htab->elf.sgotplt->size = 0; |
| 1276 | } |
| 1277 | |
| 1278 | /* The check_relocs and adjust_dynamic_symbol entry points have |
| 1279 | determined the sizes of the various dynamic sections. Allocate |
| 1280 | memory for them. */ |
| 1281 | for (s = dynobj->sections; s != NULL; s = s->next) |
| 1282 | { |
| 1283 | if ((s->flags & SEC_LINKER_CREATED) == 0) |
| 1284 | continue; |
| 1285 | |
| 1286 | if (s == htab->elf.splt |
| 1287 | || s == htab->elf.sgot |
| 1288 | || s == htab->elf.sgotplt |
| 1289 | || s == htab->elf.sdynbss |
| 1290 | || s == htab->elf.sdynrelro |
| 1291 | || s == htab->sdyntdata) |
| 1292 | { |
| 1293 | /* Strip this section if we don't need it; see the |
| 1294 | comment below. */ |
| 1295 | } |
| 1296 | else if (strncmp (s->name, ".rela", 5) == 0) |
| 1297 | { |
| 1298 | if (s->size != 0) |
| 1299 | { |
| 1300 | /* We use the reloc_count field as a counter if we need |
| 1301 | to copy relocs into the output file. */ |
| 1302 | s->reloc_count = 0; |
| 1303 | } |
| 1304 | } |
| 1305 | else |
| 1306 | { |
| 1307 | /* It's not one of our sections. */ |
| 1308 | continue; |
| 1309 | } |
| 1310 | |
| 1311 | if (s->size == 0) |
| 1312 | { |
| 1313 | /* If we don't need this section, strip it from the |
| 1314 | output file. This is mostly to handle .rela.bss and |
| 1315 | .rela.plt. We must create both sections in |
| 1316 | create_dynamic_sections, because they must be created |
| 1317 | before the linker maps input sections to output |
| 1318 | sections. The linker does that before |
| 1319 | adjust_dynamic_symbol is called, and it is that |
| 1320 | function which decides whether anything needs to go |
| 1321 | into these sections. */ |
| 1322 | s->flags |= SEC_EXCLUDE; |
| 1323 | continue; |
| 1324 | } |
| 1325 | |
| 1326 | if ((s->flags & SEC_HAS_CONTENTS) == 0) |
| 1327 | continue; |
| 1328 | |
| 1329 | /* Allocate memory for the section contents. Zero the memory |
| 1330 | for the benefit of .rela.plt, which has 4 unused entries |
| 1331 | at the beginning, and we don't want garbage. */ |
| 1332 | s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); |
| 1333 | if (s->contents == NULL) |
| 1334 | return FALSE; |
| 1335 | } |
| 1336 | |
| 1337 | if (elf_hash_table (info)->dynamic_sections_created) |
| 1338 | { |
| 1339 | /* Add some entries to the .dynamic section. We fill in the |
| 1340 | values later, in riscv_elf_finish_dynamic_sections, but we |
| 1341 | must add the entries now so that we get the correct size for |
| 1342 | the .dynamic section. The DT_DEBUG entry is filled in by the |
| 1343 | dynamic linker and used by the debugger. */ |
| 1344 | #define add_dynamic_entry(TAG, VAL) \ |
| 1345 | _bfd_elf_add_dynamic_entry (info, TAG, VAL) |
| 1346 | |
| 1347 | if (bfd_link_executable (info)) |
| 1348 | { |
| 1349 | if (!add_dynamic_entry (DT_DEBUG, 0)) |
| 1350 | return FALSE; |
| 1351 | } |
| 1352 | |
| 1353 | if (htab->elf.srelplt->size != 0) |
| 1354 | { |
| 1355 | if (!add_dynamic_entry (DT_PLTGOT, 0) |
| 1356 | || !add_dynamic_entry (DT_PLTRELSZ, 0) |
| 1357 | || !add_dynamic_entry (DT_PLTREL, DT_RELA) |
| 1358 | || !add_dynamic_entry (DT_JMPREL, 0)) |
| 1359 | return FALSE; |
| 1360 | } |
| 1361 | |
| 1362 | if (!add_dynamic_entry (DT_RELA, 0) |
| 1363 | || !add_dynamic_entry (DT_RELASZ, 0) |
| 1364 | || !add_dynamic_entry (DT_RELAENT, sizeof (ElfNN_External_Rela))) |
| 1365 | return FALSE; |
| 1366 | |
| 1367 | /* If any dynamic relocs apply to a read-only section, |
| 1368 | then we need a DT_TEXTREL entry. */ |
| 1369 | if ((info->flags & DF_TEXTREL) == 0) |
| 1370 | elf_link_hash_traverse (&htab->elf, maybe_set_textrel, info); |
| 1371 | |
| 1372 | if (info->flags & DF_TEXTREL) |
| 1373 | { |
| 1374 | if (!add_dynamic_entry (DT_TEXTREL, 0)) |
| 1375 | return FALSE; |
| 1376 | } |
| 1377 | } |
| 1378 | #undef add_dynamic_entry |
| 1379 | |
| 1380 | return TRUE; |
| 1381 | } |
| 1382 | |
| 1383 | #define TP_OFFSET 0 |
| 1384 | #define DTP_OFFSET 0x800 |
| 1385 | |
| 1386 | /* Return the relocation value for a TLS dtp-relative reloc. */ |
| 1387 | |
| 1388 | static bfd_vma |
| 1389 | dtpoff (struct bfd_link_info *info, bfd_vma address) |
| 1390 | { |
| 1391 | /* If tls_sec is NULL, we should have signalled an error already. */ |
| 1392 | if (elf_hash_table (info)->tls_sec == NULL) |
| 1393 | return 0; |
| 1394 | return address - elf_hash_table (info)->tls_sec->vma - DTP_OFFSET; |
| 1395 | } |
| 1396 | |
| 1397 | /* Return the relocation value for a static TLS tp-relative relocation. */ |
| 1398 | |
| 1399 | static bfd_vma |
| 1400 | tpoff (struct bfd_link_info *info, bfd_vma address) |
| 1401 | { |
| 1402 | /* If tls_sec is NULL, we should have signalled an error already. */ |
| 1403 | if (elf_hash_table (info)->tls_sec == NULL) |
| 1404 | return 0; |
| 1405 | return address - elf_hash_table (info)->tls_sec->vma - TP_OFFSET; |
| 1406 | } |
| 1407 | |
| 1408 | /* Return the global pointer's value, or 0 if it is not in use. */ |
| 1409 | |
| 1410 | static bfd_vma |
| 1411 | riscv_global_pointer_value (struct bfd_link_info *info) |
| 1412 | { |
| 1413 | struct bfd_link_hash_entry *h; |
| 1414 | |
| 1415 | h = bfd_link_hash_lookup (info->hash, RISCV_GP_SYMBOL, FALSE, FALSE, TRUE); |
| 1416 | if (h == NULL || h->type != bfd_link_hash_defined) |
| 1417 | return 0; |
| 1418 | |
| 1419 | return h->u.def.value + sec_addr (h->u.def.section); |
| 1420 | } |
| 1421 | |
| 1422 | /* Emplace a static relocation. */ |
| 1423 | |
| 1424 | static bfd_reloc_status_type |
| 1425 | perform_relocation (const reloc_howto_type *howto, |
| 1426 | const Elf_Internal_Rela *rel, |
| 1427 | bfd_vma value, |
| 1428 | asection *input_section, |
| 1429 | bfd *input_bfd, |
| 1430 | bfd_byte *contents) |
| 1431 | { |
| 1432 | if (howto->pc_relative) |
| 1433 | value -= sec_addr (input_section) + rel->r_offset; |
| 1434 | value += rel->r_addend; |
| 1435 | |
| 1436 | switch (ELFNN_R_TYPE (rel->r_info)) |
| 1437 | { |
| 1438 | case R_RISCV_HI20: |
| 1439 | case R_RISCV_TPREL_HI20: |
| 1440 | case R_RISCV_PCREL_HI20: |
| 1441 | case R_RISCV_GOT_HI20: |
| 1442 | case R_RISCV_TLS_GOT_HI20: |
| 1443 | case R_RISCV_TLS_GD_HI20: |
| 1444 | if (ARCH_SIZE > 32 && !VALID_UTYPE_IMM (RISCV_CONST_HIGH_PART (value))) |
| 1445 | return bfd_reloc_overflow; |
| 1446 | value = ENCODE_UTYPE_IMM (RISCV_CONST_HIGH_PART (value)); |
| 1447 | break; |
| 1448 | |
| 1449 | case R_RISCV_LO12_I: |
| 1450 | case R_RISCV_GPREL_I: |
| 1451 | case R_RISCV_TPREL_LO12_I: |
| 1452 | case R_RISCV_TPREL_I: |
| 1453 | case R_RISCV_PCREL_LO12_I: |
| 1454 | value = ENCODE_ITYPE_IMM (value); |
| 1455 | break; |
| 1456 | |
| 1457 | case R_RISCV_LO12_S: |
| 1458 | case R_RISCV_GPREL_S: |
| 1459 | case R_RISCV_TPREL_LO12_S: |
| 1460 | case R_RISCV_TPREL_S: |
| 1461 | case R_RISCV_PCREL_LO12_S: |
| 1462 | value = ENCODE_STYPE_IMM (value); |
| 1463 | break; |
| 1464 | |
| 1465 | case R_RISCV_CALL: |
| 1466 | case R_RISCV_CALL_PLT: |
| 1467 | if (ARCH_SIZE > 32 && !VALID_UTYPE_IMM (RISCV_CONST_HIGH_PART (value))) |
| 1468 | return bfd_reloc_overflow; |
| 1469 | value = ENCODE_UTYPE_IMM (RISCV_CONST_HIGH_PART (value)) |
| 1470 | | (ENCODE_ITYPE_IMM (value) << 32); |
| 1471 | break; |
| 1472 | |
| 1473 | case R_RISCV_JAL: |
| 1474 | if (!VALID_UJTYPE_IMM (value)) |
| 1475 | return bfd_reloc_overflow; |
| 1476 | value = ENCODE_UJTYPE_IMM (value); |
| 1477 | break; |
| 1478 | |
| 1479 | case R_RISCV_BRANCH: |
| 1480 | if (!VALID_SBTYPE_IMM (value)) |
| 1481 | return bfd_reloc_overflow; |
| 1482 | value = ENCODE_SBTYPE_IMM (value); |
| 1483 | break; |
| 1484 | |
| 1485 | case R_RISCV_RVC_BRANCH: |
| 1486 | if (!VALID_RVC_B_IMM (value)) |
| 1487 | return bfd_reloc_overflow; |
| 1488 | value = ENCODE_RVC_B_IMM (value); |
| 1489 | break; |
| 1490 | |
| 1491 | case R_RISCV_RVC_JUMP: |
| 1492 | if (!VALID_RVC_J_IMM (value)) |
| 1493 | return bfd_reloc_overflow; |
| 1494 | value = ENCODE_RVC_J_IMM (value); |
| 1495 | break; |
| 1496 | |
| 1497 | case R_RISCV_RVC_LUI: |
| 1498 | if (RISCV_CONST_HIGH_PART (value) == 0) |
| 1499 | { |
| 1500 | /* Linker relaxation can convert an address equal to or greater than |
| 1501 | 0x800 to slightly below 0x800. C.LUI does not accept zero as a |
| 1502 | valid immediate. We can fix this by converting it to a C.LI. */ |
| 1503 | bfd_vma insn = bfd_get (howto->bitsize, input_bfd, |
| 1504 | contents + rel->r_offset); |
| 1505 | insn = (insn & ~MATCH_C_LUI) | MATCH_C_LI; |
| 1506 | bfd_put (howto->bitsize, input_bfd, insn, contents + rel->r_offset); |
| 1507 | value = ENCODE_RVC_IMM (0); |
| 1508 | } |
| 1509 | else if (!VALID_RVC_LUI_IMM (RISCV_CONST_HIGH_PART (value))) |
| 1510 | return bfd_reloc_overflow; |
| 1511 | else |
| 1512 | value = ENCODE_RVC_LUI_IMM (RISCV_CONST_HIGH_PART (value)); |
| 1513 | break; |
| 1514 | |
| 1515 | case R_RISCV_32: |
| 1516 | case R_RISCV_64: |
| 1517 | case R_RISCV_ADD8: |
| 1518 | case R_RISCV_ADD16: |
| 1519 | case R_RISCV_ADD32: |
| 1520 | case R_RISCV_ADD64: |
| 1521 | case R_RISCV_SUB6: |
| 1522 | case R_RISCV_SUB8: |
| 1523 | case R_RISCV_SUB16: |
| 1524 | case R_RISCV_SUB32: |
| 1525 | case R_RISCV_SUB64: |
| 1526 | case R_RISCV_SET6: |
| 1527 | case R_RISCV_SET8: |
| 1528 | case R_RISCV_SET16: |
| 1529 | case R_RISCV_SET32: |
| 1530 | case R_RISCV_32_PCREL: |
| 1531 | case R_RISCV_TLS_DTPREL32: |
| 1532 | case R_RISCV_TLS_DTPREL64: |
| 1533 | break; |
| 1534 | |
| 1535 | case R_RISCV_DELETE: |
| 1536 | return bfd_reloc_ok; |
| 1537 | |
| 1538 | default: |
| 1539 | return bfd_reloc_notsupported; |
| 1540 | } |
| 1541 | |
| 1542 | bfd_vma word = bfd_get (howto->bitsize, input_bfd, contents + rel->r_offset); |
| 1543 | word = (word & ~howto->dst_mask) | (value & howto->dst_mask); |
| 1544 | bfd_put (howto->bitsize, input_bfd, word, contents + rel->r_offset); |
| 1545 | |
| 1546 | return bfd_reloc_ok; |
| 1547 | } |
| 1548 | |
| 1549 | /* Remember all PC-relative high-part relocs we've encountered to help us |
| 1550 | later resolve the corresponding low-part relocs. */ |
| 1551 | |
| 1552 | typedef struct |
| 1553 | { |
| 1554 | bfd_vma address; |
| 1555 | bfd_vma value; |
| 1556 | } riscv_pcrel_hi_reloc; |
| 1557 | |
| 1558 | typedef struct riscv_pcrel_lo_reloc |
| 1559 | { |
| 1560 | asection * input_section; |
| 1561 | struct bfd_link_info * info; |
| 1562 | reloc_howto_type * howto; |
| 1563 | const Elf_Internal_Rela * reloc; |
| 1564 | bfd_vma addr; |
| 1565 | const char * name; |
| 1566 | bfd_byte * contents; |
| 1567 | struct riscv_pcrel_lo_reloc * next; |
| 1568 | } riscv_pcrel_lo_reloc; |
| 1569 | |
| 1570 | typedef struct |
| 1571 | { |
| 1572 | htab_t hi_relocs; |
| 1573 | riscv_pcrel_lo_reloc *lo_relocs; |
| 1574 | } riscv_pcrel_relocs; |
| 1575 | |
| 1576 | static hashval_t |
| 1577 | riscv_pcrel_reloc_hash (const void *entry) |
| 1578 | { |
| 1579 | const riscv_pcrel_hi_reloc *e = entry; |
| 1580 | return (hashval_t)(e->address >> 2); |
| 1581 | } |
| 1582 | |
| 1583 | static bfd_boolean |
| 1584 | riscv_pcrel_reloc_eq (const void *entry1, const void *entry2) |
| 1585 | { |
| 1586 | const riscv_pcrel_hi_reloc *e1 = entry1, *e2 = entry2; |
| 1587 | return e1->address == e2->address; |
| 1588 | } |
| 1589 | |
| 1590 | static bfd_boolean |
| 1591 | riscv_init_pcrel_relocs (riscv_pcrel_relocs *p) |
| 1592 | { |
| 1593 | |
| 1594 | p->lo_relocs = NULL; |
| 1595 | p->hi_relocs = htab_create (1024, riscv_pcrel_reloc_hash, |
| 1596 | riscv_pcrel_reloc_eq, free); |
| 1597 | return p->hi_relocs != NULL; |
| 1598 | } |
| 1599 | |
| 1600 | static void |
| 1601 | riscv_free_pcrel_relocs (riscv_pcrel_relocs *p) |
| 1602 | { |
| 1603 | riscv_pcrel_lo_reloc *cur = p->lo_relocs; |
| 1604 | |
| 1605 | while (cur != NULL) |
| 1606 | { |
| 1607 | riscv_pcrel_lo_reloc *next = cur->next; |
| 1608 | free (cur); |
| 1609 | cur = next; |
| 1610 | } |
| 1611 | |
| 1612 | htab_delete (p->hi_relocs); |
| 1613 | } |
| 1614 | |
| 1615 | static bfd_boolean |
| 1616 | riscv_zero_pcrel_hi_reloc (Elf_Internal_Rela *rel, |
| 1617 | struct bfd_link_info *info, |
| 1618 | bfd_vma pc, |
| 1619 | bfd_vma addr, |
| 1620 | bfd_byte *contents, |
| 1621 | const reloc_howto_type *howto, |
| 1622 | bfd *input_bfd) |
| 1623 | { |
| 1624 | /* We may need to reference low addreses in PC-relative modes even when the |
| 1625 | * PC is far away from these addresses. For example, undefweak references |
| 1626 | * need to produce the address 0 when linked. As 0 is far from the arbitrary |
| 1627 | * addresses that we can link PC-relative programs at, the linker can't |
| 1628 | * actually relocate references to those symbols. In order to allow these |
| 1629 | * programs to work we simply convert the PC-relative auipc sequences to |
| 1630 | * 0-relative lui sequences. */ |
| 1631 | if (bfd_link_pic (info)) |
| 1632 | return FALSE; |
| 1633 | |
| 1634 | /* If it's possible to reference the symbol using auipc we do so, as that's |
| 1635 | * more in the spirit of the PC-relative relocations we're processing. */ |
| 1636 | bfd_vma offset = addr - pc; |
| 1637 | if (ARCH_SIZE == 32 || VALID_UTYPE_IMM (RISCV_CONST_HIGH_PART (offset))) |
| 1638 | return FALSE; |
| 1639 | |
| 1640 | /* If it's impossible to reference this with a LUI-based offset then don't |
| 1641 | * bother to convert it at all so users still see the PC-relative relocation |
| 1642 | * in the truncation message. */ |
| 1643 | if (ARCH_SIZE > 32 && !VALID_UTYPE_IMM (RISCV_CONST_HIGH_PART (addr))) |
| 1644 | return FALSE; |
| 1645 | |
| 1646 | rel->r_info = ELFNN_R_INFO(addr, R_RISCV_HI20); |
| 1647 | |
| 1648 | bfd_vma insn = bfd_get(howto->bitsize, input_bfd, contents + rel->r_offset); |
| 1649 | insn = (insn & ~MASK_AUIPC) | MATCH_LUI; |
| 1650 | bfd_put(howto->bitsize, input_bfd, insn, contents + rel->r_offset); |
| 1651 | return TRUE; |
| 1652 | } |
| 1653 | |
| 1654 | static bfd_boolean |
| 1655 | riscv_record_pcrel_hi_reloc (riscv_pcrel_relocs *p, bfd_vma addr, |
| 1656 | bfd_vma value, bfd_boolean absolute) |
| 1657 | { |
| 1658 | bfd_vma offset = absolute ? value : value - addr; |
| 1659 | riscv_pcrel_hi_reloc entry = {addr, offset}; |
| 1660 | riscv_pcrel_hi_reloc **slot = |
| 1661 | (riscv_pcrel_hi_reloc **) htab_find_slot (p->hi_relocs, &entry, INSERT); |
| 1662 | |
| 1663 | BFD_ASSERT (*slot == NULL); |
| 1664 | *slot = (riscv_pcrel_hi_reloc *) bfd_malloc (sizeof (riscv_pcrel_hi_reloc)); |
| 1665 | if (*slot == NULL) |
| 1666 | return FALSE; |
| 1667 | **slot = entry; |
| 1668 | return TRUE; |
| 1669 | } |
| 1670 | |
| 1671 | static bfd_boolean |
| 1672 | riscv_record_pcrel_lo_reloc (riscv_pcrel_relocs *p, |
| 1673 | asection *input_section, |
| 1674 | struct bfd_link_info *info, |
| 1675 | reloc_howto_type *howto, |
| 1676 | const Elf_Internal_Rela *reloc, |
| 1677 | bfd_vma addr, |
| 1678 | const char *name, |
| 1679 | bfd_byte *contents) |
| 1680 | { |
| 1681 | riscv_pcrel_lo_reloc *entry; |
| 1682 | entry = (riscv_pcrel_lo_reloc *) bfd_malloc (sizeof (riscv_pcrel_lo_reloc)); |
| 1683 | if (entry == NULL) |
| 1684 | return FALSE; |
| 1685 | *entry = (riscv_pcrel_lo_reloc) {input_section, info, howto, reloc, addr, |
| 1686 | name, contents, p->lo_relocs}; |
| 1687 | p->lo_relocs = entry; |
| 1688 | return TRUE; |
| 1689 | } |
| 1690 | |
| 1691 | static bfd_boolean |
| 1692 | riscv_resolve_pcrel_lo_relocs (riscv_pcrel_relocs *p) |
| 1693 | { |
| 1694 | riscv_pcrel_lo_reloc *r; |
| 1695 | |
| 1696 | for (r = p->lo_relocs; r != NULL; r = r->next) |
| 1697 | { |
| 1698 | bfd *input_bfd = r->input_section->owner; |
| 1699 | |
| 1700 | riscv_pcrel_hi_reloc search = {r->addr, 0}; |
| 1701 | riscv_pcrel_hi_reloc *entry = htab_find (p->hi_relocs, &search); |
| 1702 | if (entry == NULL |
| 1703 | /* Check for overflow into bit 11 when adding reloc addend. */ |
| 1704 | || (! (entry->value & 0x800) |
| 1705 | && ((entry->value + r->reloc->r_addend) & 0x800))) |
| 1706 | { |
| 1707 | char *string = (entry == NULL |
| 1708 | ? "%pcrel_lo missing matching %pcrel_hi" |
| 1709 | : "%pcrel_lo overflow with an addend"); |
| 1710 | (*r->info->callbacks->reloc_dangerous) |
| 1711 | (r->info, string, input_bfd, r->input_section, r->reloc->r_offset); |
| 1712 | return TRUE; |
| 1713 | } |
| 1714 | |
| 1715 | perform_relocation (r->howto, r->reloc, entry->value, r->input_section, |
| 1716 | input_bfd, r->contents); |
| 1717 | } |
| 1718 | |
| 1719 | return TRUE; |
| 1720 | } |
| 1721 | |
| 1722 | /* Relocate a RISC-V ELF section. |
| 1723 | |
| 1724 | The RELOCATE_SECTION function is called by the new ELF backend linker |
| 1725 | to handle the relocations for a section. |
| 1726 | |
| 1727 | The relocs are always passed as Rela structures. |
| 1728 | |
| 1729 | This function is responsible for adjusting the section contents as |
| 1730 | necessary, and (if generating a relocatable output file) adjusting |
| 1731 | the reloc addend as necessary. |
| 1732 | |
| 1733 | This function does not have to worry about setting the reloc |
| 1734 | address or the reloc symbol index. |
| 1735 | |
| 1736 | LOCAL_SYMS is a pointer to the swapped in local symbols. |
| 1737 | |
| 1738 | LOCAL_SECTIONS is an array giving the section in the input file |
| 1739 | corresponding to the st_shndx field of each local symbol. |
| 1740 | |
| 1741 | The global hash table entry for the global symbols can be found |
| 1742 | via elf_sym_hashes (input_bfd). |
| 1743 | |
| 1744 | When generating relocatable output, this function must handle |
| 1745 | STB_LOCAL/STT_SECTION symbols specially. The output symbol is |
| 1746 | going to be the section symbol corresponding to the output |
| 1747 | section, which means that the addend must be adjusted |
| 1748 | accordingly. */ |
| 1749 | |
| 1750 | static bfd_boolean |
| 1751 | riscv_elf_relocate_section (bfd *output_bfd, |
| 1752 | struct bfd_link_info *info, |
| 1753 | bfd *input_bfd, |
| 1754 | asection *input_section, |
| 1755 | bfd_byte *contents, |
| 1756 | Elf_Internal_Rela *relocs, |
| 1757 | Elf_Internal_Sym *local_syms, |
| 1758 | asection **local_sections) |
| 1759 | { |
| 1760 | Elf_Internal_Rela *rel; |
| 1761 | Elf_Internal_Rela *relend; |
| 1762 | riscv_pcrel_relocs pcrel_relocs; |
| 1763 | bfd_boolean ret = FALSE; |
| 1764 | asection *sreloc = elf_section_data (input_section)->sreloc; |
| 1765 | struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info); |
| 1766 | Elf_Internal_Shdr *symtab_hdr = &elf_symtab_hdr (input_bfd); |
| 1767 | struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (input_bfd); |
| 1768 | bfd_vma *local_got_offsets = elf_local_got_offsets (input_bfd); |
| 1769 | bfd_boolean absolute; |
| 1770 | |
| 1771 | if (!riscv_init_pcrel_relocs (&pcrel_relocs)) |
| 1772 | return FALSE; |
| 1773 | |
| 1774 | relend = relocs + input_section->reloc_count; |
| 1775 | for (rel = relocs; rel < relend; rel++) |
| 1776 | { |
| 1777 | unsigned long r_symndx; |
| 1778 | struct elf_link_hash_entry *h; |
| 1779 | Elf_Internal_Sym *sym; |
| 1780 | asection *sec; |
| 1781 | bfd_vma relocation; |
| 1782 | bfd_reloc_status_type r = bfd_reloc_ok; |
| 1783 | const char *name; |
| 1784 | bfd_vma off, ie_off; |
| 1785 | bfd_boolean unresolved_reloc, is_ie = FALSE; |
| 1786 | bfd_vma pc = sec_addr (input_section) + rel->r_offset; |
| 1787 | int r_type = ELFNN_R_TYPE (rel->r_info), tls_type; |
| 1788 | reloc_howto_type *howto = riscv_elf_rtype_to_howto (input_bfd, r_type); |
| 1789 | const char *msg = NULL; |
| 1790 | char *msg_buf = NULL; |
| 1791 | bfd_boolean resolved_to_zero; |
| 1792 | |
| 1793 | if (howto == NULL |
| 1794 | || r_type == R_RISCV_GNU_VTINHERIT || r_type == R_RISCV_GNU_VTENTRY) |
| 1795 | continue; |
| 1796 | |
| 1797 | /* This is a final link. */ |
| 1798 | r_symndx = ELFNN_R_SYM (rel->r_info); |
| 1799 | h = NULL; |
| 1800 | sym = NULL; |
| 1801 | sec = NULL; |
| 1802 | unresolved_reloc = FALSE; |
| 1803 | if (r_symndx < symtab_hdr->sh_info) |
| 1804 | { |
| 1805 | sym = local_syms + r_symndx; |
| 1806 | sec = local_sections[r_symndx]; |
| 1807 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); |
| 1808 | } |
| 1809 | else |
| 1810 | { |
| 1811 | bfd_boolean warned, ignored; |
| 1812 | |
| 1813 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
| 1814 | r_symndx, symtab_hdr, sym_hashes, |
| 1815 | h, sec, relocation, |
| 1816 | unresolved_reloc, warned, ignored); |
| 1817 | if (warned) |
| 1818 | { |
| 1819 | /* To avoid generating warning messages about truncated |
| 1820 | relocations, set the relocation's address to be the same as |
| 1821 | the start of this section. */ |
| 1822 | if (input_section->output_section != NULL) |
| 1823 | relocation = input_section->output_section->vma; |
| 1824 | else |
| 1825 | relocation = 0; |
| 1826 | } |
| 1827 | } |
| 1828 | |
| 1829 | if (sec != NULL && discarded_section (sec)) |
| 1830 | RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, |
| 1831 | rel, 1, relend, howto, 0, contents); |
| 1832 | |
| 1833 | if (bfd_link_relocatable (info)) |
| 1834 | continue; |
| 1835 | |
| 1836 | if (h != NULL) |
| 1837 | name = h->root.root.string; |
| 1838 | else |
| 1839 | { |
| 1840 | name = (bfd_elf_string_from_elf_section |
| 1841 | (input_bfd, symtab_hdr->sh_link, sym->st_name)); |
| 1842 | if (name == NULL || *name == '\0') |
| 1843 | name = bfd_section_name (sec); |
| 1844 | } |
| 1845 | |
| 1846 | resolved_to_zero = (h != NULL |
| 1847 | && UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)); |
| 1848 | |
| 1849 | switch (r_type) |
| 1850 | { |
| 1851 | case R_RISCV_NONE: |
| 1852 | case R_RISCV_RELAX: |
| 1853 | case R_RISCV_TPREL_ADD: |
| 1854 | case R_RISCV_COPY: |
| 1855 | case R_RISCV_JUMP_SLOT: |
| 1856 | case R_RISCV_RELATIVE: |
| 1857 | /* These require nothing of us at all. */ |
| 1858 | continue; |
| 1859 | |
| 1860 | case R_RISCV_HI20: |
| 1861 | case R_RISCV_BRANCH: |
| 1862 | case R_RISCV_RVC_BRANCH: |
| 1863 | case R_RISCV_RVC_LUI: |
| 1864 | case R_RISCV_LO12_I: |
| 1865 | case R_RISCV_LO12_S: |
| 1866 | case R_RISCV_SET6: |
| 1867 | case R_RISCV_SET8: |
| 1868 | case R_RISCV_SET16: |
| 1869 | case R_RISCV_SET32: |
| 1870 | case R_RISCV_32_PCREL: |
| 1871 | case R_RISCV_DELETE: |
| 1872 | /* These require no special handling beyond perform_relocation. */ |
| 1873 | break; |
| 1874 | |
| 1875 | case R_RISCV_GOT_HI20: |
| 1876 | if (h != NULL) |
| 1877 | { |
| 1878 | bfd_boolean dyn, pic; |
| 1879 | |
| 1880 | off = h->got.offset; |
| 1881 | BFD_ASSERT (off != (bfd_vma) -1); |
| 1882 | dyn = elf_hash_table (info)->dynamic_sections_created; |
| 1883 | pic = bfd_link_pic (info); |
| 1884 | |
| 1885 | if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, pic, h) |
| 1886 | || (pic && SYMBOL_REFERENCES_LOCAL (info, h))) |
| 1887 | { |
| 1888 | /* This is actually a static link, or it is a |
| 1889 | -Bsymbolic link and the symbol is defined |
| 1890 | locally, or the symbol was forced to be local |
| 1891 | because of a version file. We must initialize |
| 1892 | this entry in the global offset table. Since the |
| 1893 | offset must always be a multiple of the word size, |
| 1894 | we use the least significant bit to record whether |
| 1895 | we have initialized it already. |
| 1896 | |
| 1897 | When doing a dynamic link, we create a .rela.got |
| 1898 | relocation entry to initialize the value. This |
| 1899 | is done in the finish_dynamic_symbol routine. */ |
| 1900 | if ((off & 1) != 0) |
| 1901 | off &= ~1; |
| 1902 | else |
| 1903 | { |
| 1904 | bfd_put_NN (output_bfd, relocation, |
| 1905 | htab->elf.sgot->contents + off); |
| 1906 | h->got.offset |= 1; |
| 1907 | } |
| 1908 | } |
| 1909 | else |
| 1910 | unresolved_reloc = FALSE; |
| 1911 | } |
| 1912 | else |
| 1913 | { |
| 1914 | BFD_ASSERT (local_got_offsets != NULL |
| 1915 | && local_got_offsets[r_symndx] != (bfd_vma) -1); |
| 1916 | |
| 1917 | off = local_got_offsets[r_symndx]; |
| 1918 | |
| 1919 | /* The offset must always be a multiple of the word size. |
| 1920 | So, we can use the least significant bit to record |
| 1921 | whether we have already processed this entry. */ |
| 1922 | if ((off & 1) != 0) |
| 1923 | off &= ~1; |
| 1924 | else |
| 1925 | { |
| 1926 | if (bfd_link_pic (info)) |
| 1927 | { |
| 1928 | asection *s; |
| 1929 | Elf_Internal_Rela outrel; |
| 1930 | |
| 1931 | /* We need to generate a R_RISCV_RELATIVE reloc |
| 1932 | for the dynamic linker. */ |
| 1933 | s = htab->elf.srelgot; |
| 1934 | BFD_ASSERT (s != NULL); |
| 1935 | |
| 1936 | outrel.r_offset = sec_addr (htab->elf.sgot) + off; |
| 1937 | outrel.r_info = |
| 1938 | ELFNN_R_INFO (0, R_RISCV_RELATIVE); |
| 1939 | outrel.r_addend = relocation; |
| 1940 | relocation = 0; |
| 1941 | riscv_elf_append_rela (output_bfd, s, &outrel); |
| 1942 | } |
| 1943 | |
| 1944 | bfd_put_NN (output_bfd, relocation, |
| 1945 | htab->elf.sgot->contents + off); |
| 1946 | local_got_offsets[r_symndx] |= 1; |
| 1947 | } |
| 1948 | } |
| 1949 | relocation = sec_addr (htab->elf.sgot) + off; |
| 1950 | absolute = riscv_zero_pcrel_hi_reloc (rel, |
| 1951 | info, |
| 1952 | pc, |
| 1953 | relocation, |
| 1954 | contents, |
| 1955 | howto, |
| 1956 | input_bfd); |
| 1957 | r_type = ELFNN_R_TYPE (rel->r_info); |
| 1958 | howto = riscv_elf_rtype_to_howto (input_bfd, r_type); |
| 1959 | if (howto == NULL) |
| 1960 | r = bfd_reloc_notsupported; |
| 1961 | else if (!riscv_record_pcrel_hi_reloc (&pcrel_relocs, pc, |
| 1962 | relocation, absolute)) |
| 1963 | r = bfd_reloc_overflow; |
| 1964 | break; |
| 1965 | |
| 1966 | case R_RISCV_ADD8: |
| 1967 | case R_RISCV_ADD16: |
| 1968 | case R_RISCV_ADD32: |
| 1969 | case R_RISCV_ADD64: |
| 1970 | { |
| 1971 | bfd_vma old_value = bfd_get (howto->bitsize, input_bfd, |
| 1972 | contents + rel->r_offset); |
| 1973 | relocation = old_value + relocation; |
| 1974 | } |
| 1975 | break; |
| 1976 | |
| 1977 | case R_RISCV_SUB6: |
| 1978 | case R_RISCV_SUB8: |
| 1979 | case R_RISCV_SUB16: |
| 1980 | case R_RISCV_SUB32: |
| 1981 | case R_RISCV_SUB64: |
| 1982 | { |
| 1983 | bfd_vma old_value = bfd_get (howto->bitsize, input_bfd, |
| 1984 | contents + rel->r_offset); |
| 1985 | relocation = old_value - relocation; |
| 1986 | } |
| 1987 | break; |
| 1988 | |
| 1989 | case R_RISCV_CALL: |
| 1990 | case R_RISCV_CALL_PLT: |
| 1991 | /* Handle a call to an undefined weak function. This won't be |
| 1992 | relaxed, so we have to handle it here. */ |
| 1993 | if (h != NULL && h->root.type == bfd_link_hash_undefweak |
| 1994 | && (!bfd_link_pic (info) || h->plt.offset == MINUS_ONE)) |
| 1995 | { |
| 1996 | /* We can use x0 as the base register. */ |
| 1997 | bfd_vma insn = bfd_get_32 (input_bfd, |
| 1998 | contents + rel->r_offset + 4); |
| 1999 | insn &= ~(OP_MASK_RS1 << OP_SH_RS1); |
| 2000 | bfd_put_32 (input_bfd, insn, contents + rel->r_offset + 4); |
| 2001 | /* Set the relocation value so that we get 0 after the pc |
| 2002 | relative adjustment. */ |
| 2003 | relocation = sec_addr (input_section) + rel->r_offset; |
| 2004 | } |
| 2005 | /* Fall through. */ |
| 2006 | |
| 2007 | case R_RISCV_JAL: |
| 2008 | case R_RISCV_RVC_JUMP: |
| 2009 | /* This line has to match the check in _bfd_riscv_relax_section. */ |
| 2010 | if (bfd_link_pic (info) && h != NULL && h->plt.offset != MINUS_ONE) |
| 2011 | { |
| 2012 | /* Refer to the PLT entry. */ |
| 2013 | relocation = sec_addr (htab->elf.splt) + h->plt.offset; |
| 2014 | unresolved_reloc = FALSE; |
| 2015 | } |
| 2016 | break; |
| 2017 | |
| 2018 | case R_RISCV_TPREL_HI20: |
| 2019 | relocation = tpoff (info, relocation); |
| 2020 | break; |
| 2021 | |
| 2022 | case R_RISCV_TPREL_LO12_I: |
| 2023 | case R_RISCV_TPREL_LO12_S: |
| 2024 | relocation = tpoff (info, relocation); |
| 2025 | break; |
| 2026 | |
| 2027 | case R_RISCV_TPREL_I: |
| 2028 | case R_RISCV_TPREL_S: |
| 2029 | relocation = tpoff (info, relocation); |
| 2030 | if (VALID_ITYPE_IMM (relocation + rel->r_addend)) |
| 2031 | { |
| 2032 | /* We can use tp as the base register. */ |
| 2033 | bfd_vma insn = bfd_get_32 (input_bfd, contents + rel->r_offset); |
| 2034 | insn &= ~(OP_MASK_RS1 << OP_SH_RS1); |
| 2035 | insn |= X_TP << OP_SH_RS1; |
| 2036 | bfd_put_32 (input_bfd, insn, contents + rel->r_offset); |
| 2037 | } |
| 2038 | else |
| 2039 | r = bfd_reloc_overflow; |
| 2040 | break; |
| 2041 | |
| 2042 | case R_RISCV_GPREL_I: |
| 2043 | case R_RISCV_GPREL_S: |
| 2044 | { |
| 2045 | bfd_vma gp = riscv_global_pointer_value (info); |
| 2046 | bfd_boolean x0_base = VALID_ITYPE_IMM (relocation + rel->r_addend); |
| 2047 | if (x0_base || VALID_ITYPE_IMM (relocation + rel->r_addend - gp)) |
| 2048 | { |
| 2049 | /* We can use x0 or gp as the base register. */ |
| 2050 | bfd_vma insn = bfd_get_32 (input_bfd, contents + rel->r_offset); |
| 2051 | insn &= ~(OP_MASK_RS1 << OP_SH_RS1); |
| 2052 | if (!x0_base) |
| 2053 | { |
| 2054 | rel->r_addend -= gp; |
| 2055 | insn |= X_GP << OP_SH_RS1; |
| 2056 | } |
| 2057 | bfd_put_32 (input_bfd, insn, contents + rel->r_offset); |
| 2058 | } |
| 2059 | else |
| 2060 | r = bfd_reloc_overflow; |
| 2061 | break; |
| 2062 | } |
| 2063 | |
| 2064 | case R_RISCV_PCREL_HI20: |
| 2065 | absolute = riscv_zero_pcrel_hi_reloc (rel, |
| 2066 | info, |
| 2067 | pc, |
| 2068 | relocation, |
| 2069 | contents, |
| 2070 | howto, |
| 2071 | input_bfd); |
| 2072 | r_type = ELFNN_R_TYPE (rel->r_info); |
| 2073 | howto = riscv_elf_rtype_to_howto (input_bfd, r_type); |
| 2074 | if (howto == NULL) |
| 2075 | r = bfd_reloc_notsupported; |
| 2076 | else if (!riscv_record_pcrel_hi_reloc (&pcrel_relocs, pc, |
| 2077 | relocation + rel->r_addend, |
| 2078 | absolute)) |
| 2079 | r = bfd_reloc_overflow; |
| 2080 | break; |
| 2081 | |
| 2082 | case R_RISCV_PCREL_LO12_I: |
| 2083 | case R_RISCV_PCREL_LO12_S: |
| 2084 | /* We don't allow section symbols plus addends as the auipc address, |
| 2085 | because then riscv_relax_delete_bytes would have to search through |
| 2086 | all relocs to update these addends. This is also ambiguous, as |
| 2087 | we do allow offsets to be added to the target address, which are |
| 2088 | not to be used to find the auipc address. */ |
| 2089 | if (((sym != NULL && (ELF_ST_TYPE (sym->st_info) == STT_SECTION)) |
| 2090 | || (h != NULL && h->type == STT_SECTION)) |
| 2091 | && rel->r_addend) |
| 2092 | { |
| 2093 | msg = _("%pcrel_lo section symbol with an addend"); |
| 2094 | r = bfd_reloc_dangerous; |
| 2095 | break; |
| 2096 | } |
| 2097 | |
| 2098 | if (riscv_record_pcrel_lo_reloc (&pcrel_relocs, input_section, info, |
| 2099 | howto, rel, relocation, name, |
| 2100 | contents)) |
| 2101 | continue; |
| 2102 | r = bfd_reloc_overflow; |
| 2103 | break; |
| 2104 | |
| 2105 | case R_RISCV_TLS_DTPREL32: |
| 2106 | case R_RISCV_TLS_DTPREL64: |
| 2107 | relocation = dtpoff (info, relocation); |
| 2108 | break; |
| 2109 | |
| 2110 | case R_RISCV_32: |
| 2111 | case R_RISCV_64: |
| 2112 | if ((input_section->flags & SEC_ALLOC) == 0) |
| 2113 | break; |
| 2114 | |
| 2115 | if ((bfd_link_pic (info) |
| 2116 | && (h == NULL |
| 2117 | || (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
| 2118 | && !resolved_to_zero) |
| 2119 | || h->root.type != bfd_link_hash_undefweak) |
| 2120 | && (! howto->pc_relative |
| 2121 | || !SYMBOL_CALLS_LOCAL (info, h))) |
| 2122 | || (!bfd_link_pic (info) |
| 2123 | && h != NULL |
| 2124 | && h->dynindx != -1 |
| 2125 | && !h->non_got_ref |
| 2126 | && ((h->def_dynamic |
| 2127 | && !h->def_regular) |
| 2128 | || h->root.type == bfd_link_hash_undefweak |
| 2129 | || h->root.type == bfd_link_hash_undefined))) |
| 2130 | { |
| 2131 | Elf_Internal_Rela outrel; |
| 2132 | bfd_boolean skip_static_relocation, skip_dynamic_relocation; |
| 2133 | |
| 2134 | /* When generating a shared object, these relocations |
| 2135 | are copied into the output file to be resolved at run |
| 2136 | time. */ |
| 2137 | |
| 2138 | outrel.r_offset = |
| 2139 | _bfd_elf_section_offset (output_bfd, info, input_section, |
| 2140 | rel->r_offset); |
| 2141 | skip_static_relocation = outrel.r_offset != (bfd_vma) -2; |
| 2142 | skip_dynamic_relocation = outrel.r_offset >= (bfd_vma) -2; |
| 2143 | outrel.r_offset += sec_addr (input_section); |
| 2144 | |
| 2145 | if (skip_dynamic_relocation) |
| 2146 | memset (&outrel, 0, sizeof outrel); |
| 2147 | else if (h != NULL && h->dynindx != -1 |
| 2148 | && !(bfd_link_pic (info) |
| 2149 | && SYMBOLIC_BIND (info, h) |
| 2150 | && h->def_regular)) |
| 2151 | { |
| 2152 | outrel.r_info = ELFNN_R_INFO (h->dynindx, r_type); |
| 2153 | outrel.r_addend = rel->r_addend; |
| 2154 | } |
| 2155 | else |
| 2156 | { |
| 2157 | outrel.r_info = ELFNN_R_INFO (0, R_RISCV_RELATIVE); |
| 2158 | outrel.r_addend = relocation + rel->r_addend; |
| 2159 | } |
| 2160 | |
| 2161 | riscv_elf_append_rela (output_bfd, sreloc, &outrel); |
| 2162 | if (skip_static_relocation) |
| 2163 | continue; |
| 2164 | } |
| 2165 | break; |
| 2166 | |
| 2167 | case R_RISCV_TLS_GOT_HI20: |
| 2168 | is_ie = TRUE; |
| 2169 | /* Fall through. */ |
| 2170 | |
| 2171 | case R_RISCV_TLS_GD_HI20: |
| 2172 | if (h != NULL) |
| 2173 | { |
| 2174 | off = h->got.offset; |
| 2175 | h->got.offset |= 1; |
| 2176 | } |
| 2177 | else |
| 2178 | { |
| 2179 | off = local_got_offsets[r_symndx]; |
| 2180 | local_got_offsets[r_symndx] |= 1; |
| 2181 | } |
| 2182 | |
| 2183 | tls_type = _bfd_riscv_elf_tls_type (input_bfd, h, r_symndx); |
| 2184 | BFD_ASSERT (tls_type & (GOT_TLS_IE | GOT_TLS_GD)); |
| 2185 | /* If this symbol is referenced by both GD and IE TLS, the IE |
| 2186 | reference's GOT slot follows the GD reference's slots. */ |
| 2187 | ie_off = 0; |
| 2188 | if ((tls_type & GOT_TLS_GD) && (tls_type & GOT_TLS_IE)) |
| 2189 | ie_off = 2 * GOT_ENTRY_SIZE; |
| 2190 | |
| 2191 | if ((off & 1) != 0) |
| 2192 | off &= ~1; |
| 2193 | else |
| 2194 | { |
| 2195 | Elf_Internal_Rela outrel; |
| 2196 | int indx = 0; |
| 2197 | bfd_boolean need_relocs = FALSE; |
| 2198 | |
| 2199 | if (htab->elf.srelgot == NULL) |
| 2200 | abort (); |
| 2201 | |
| 2202 | if (h != NULL) |
| 2203 | { |
| 2204 | bfd_boolean dyn, pic; |
| 2205 | dyn = htab->elf.dynamic_sections_created; |
| 2206 | pic = bfd_link_pic (info); |
| 2207 | |
| 2208 | if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, pic, h) |
| 2209 | && (!pic || !SYMBOL_REFERENCES_LOCAL (info, h))) |
| 2210 | indx = h->dynindx; |
| 2211 | } |
| 2212 | |
| 2213 | /* The GOT entries have not been initialized yet. Do it |
| 2214 | now, and emit any relocations. */ |
| 2215 | if ((bfd_link_pic (info) || indx != 0) |
| 2216 | && (h == NULL |
| 2217 | || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
| 2218 | || h->root.type != bfd_link_hash_undefweak)) |
| 2219 | need_relocs = TRUE; |
| 2220 | |
| 2221 | if (tls_type & GOT_TLS_GD) |
| 2222 | { |
| 2223 | if (need_relocs) |
| 2224 | { |
| 2225 | outrel.r_offset = sec_addr (htab->elf.sgot) + off; |
| 2226 | outrel.r_addend = 0; |
| 2227 | outrel.r_info = ELFNN_R_INFO (indx, R_RISCV_TLS_DTPMODNN); |
| 2228 | bfd_put_NN (output_bfd, 0, |
| 2229 | htab->elf.sgot->contents + off); |
| 2230 | riscv_elf_append_rela (output_bfd, htab->elf.srelgot, &outrel); |
| 2231 | if (indx == 0) |
| 2232 | { |
| 2233 | BFD_ASSERT (! unresolved_reloc); |
| 2234 | bfd_put_NN (output_bfd, |
| 2235 | dtpoff (info, relocation), |
| 2236 | (htab->elf.sgot->contents + off + |
| 2237 | RISCV_ELF_WORD_BYTES)); |
| 2238 | } |
| 2239 | else |
| 2240 | { |
| 2241 | bfd_put_NN (output_bfd, 0, |
| 2242 | (htab->elf.sgot->contents + off + |
| 2243 | RISCV_ELF_WORD_BYTES)); |
| 2244 | outrel.r_info = ELFNN_R_INFO (indx, R_RISCV_TLS_DTPRELNN); |
| 2245 | outrel.r_offset += RISCV_ELF_WORD_BYTES; |
| 2246 | riscv_elf_append_rela (output_bfd, htab->elf.srelgot, &outrel); |
| 2247 | } |
| 2248 | } |
| 2249 | else |
| 2250 | { |
| 2251 | /* If we are not emitting relocations for a |
| 2252 | general dynamic reference, then we must be in a |
| 2253 | static link or an executable link with the |
| 2254 | symbol binding locally. Mark it as belonging |
| 2255 | to module 1, the executable. */ |
| 2256 | bfd_put_NN (output_bfd, 1, |
| 2257 | htab->elf.sgot->contents + off); |
| 2258 | bfd_put_NN (output_bfd, |
| 2259 | dtpoff (info, relocation), |
| 2260 | (htab->elf.sgot->contents + off + |
| 2261 | RISCV_ELF_WORD_BYTES)); |
| 2262 | } |
| 2263 | } |
| 2264 | |
| 2265 | if (tls_type & GOT_TLS_IE) |
| 2266 | { |
| 2267 | if (need_relocs) |
| 2268 | { |
| 2269 | bfd_put_NN (output_bfd, 0, |
| 2270 | htab->elf.sgot->contents + off + ie_off); |
| 2271 | outrel.r_offset = sec_addr (htab->elf.sgot) |
| 2272 | + off + ie_off; |
| 2273 | outrel.r_addend = 0; |
| 2274 | if (indx == 0) |
| 2275 | outrel.r_addend = tpoff (info, relocation); |
| 2276 | outrel.r_info = ELFNN_R_INFO (indx, R_RISCV_TLS_TPRELNN); |
| 2277 | riscv_elf_append_rela (output_bfd, htab->elf.srelgot, &outrel); |
| 2278 | } |
| 2279 | else |
| 2280 | { |
| 2281 | bfd_put_NN (output_bfd, tpoff (info, relocation), |
| 2282 | htab->elf.sgot->contents + off + ie_off); |
| 2283 | } |
| 2284 | } |
| 2285 | } |
| 2286 | |
| 2287 | BFD_ASSERT (off < (bfd_vma) -2); |
| 2288 | relocation = sec_addr (htab->elf.sgot) + off + (is_ie ? ie_off : 0); |
| 2289 | if (!riscv_record_pcrel_hi_reloc (&pcrel_relocs, pc, |
| 2290 | relocation, FALSE)) |
| 2291 | r = bfd_reloc_overflow; |
| 2292 | unresolved_reloc = FALSE; |
| 2293 | break; |
| 2294 | |
| 2295 | default: |
| 2296 | r = bfd_reloc_notsupported; |
| 2297 | } |
| 2298 | |
| 2299 | /* Dynamic relocs are not propagated for SEC_DEBUGGING sections |
| 2300 | because such sections are not SEC_ALLOC and thus ld.so will |
| 2301 | not process them. */ |
| 2302 | if (unresolved_reloc |
| 2303 | && !((input_section->flags & SEC_DEBUGGING) != 0 |
| 2304 | && h->def_dynamic) |
| 2305 | && _bfd_elf_section_offset (output_bfd, info, input_section, |
| 2306 | rel->r_offset) != (bfd_vma) -1) |
| 2307 | { |
| 2308 | switch (r_type) |
| 2309 | { |
| 2310 | case R_RISCV_CALL: |
| 2311 | case R_RISCV_JAL: |
| 2312 | case R_RISCV_RVC_JUMP: |
| 2313 | if (asprintf (&msg_buf, |
| 2314 | _("%%X%%P: relocation %s against `%s' can " |
| 2315 | "not be used when making a shared object; " |
| 2316 | "recompile with -fPIC\n"), |
| 2317 | howto->name, |
| 2318 | h->root.root.string) == -1) |
| 2319 | msg_buf = NULL; |
| 2320 | break; |
| 2321 | |
| 2322 | default: |
| 2323 | if (asprintf (&msg_buf, |
| 2324 | _("%%X%%P: unresolvable %s relocation against " |
| 2325 | "symbol `%s'\n"), |
| 2326 | howto->name, |
| 2327 | h->root.root.string) == -1) |
| 2328 | msg_buf = NULL; |
| 2329 | break; |
| 2330 | } |
| 2331 | |
| 2332 | msg = msg_buf; |
| 2333 | r = bfd_reloc_notsupported; |
| 2334 | } |
| 2335 | |
| 2336 | if (r == bfd_reloc_ok) |
| 2337 | r = perform_relocation (howto, rel, relocation, input_section, |
| 2338 | input_bfd, contents); |
| 2339 | |
| 2340 | /* We should have already detected the error and set message before. |
| 2341 | If the error message isn't set since the linker runs out of memory |
| 2342 | or we don't set it before, then we should set the default message |
| 2343 | with the "internal error" string here. */ |
| 2344 | switch (r) |
| 2345 | { |
| 2346 | case bfd_reloc_ok: |
| 2347 | continue; |
| 2348 | |
| 2349 | case bfd_reloc_overflow: |
| 2350 | info->callbacks->reloc_overflow |
| 2351 | (info, (h ? &h->root : NULL), name, howto->name, |
| 2352 | (bfd_vma) 0, input_bfd, input_section, rel->r_offset); |
| 2353 | break; |
| 2354 | |
| 2355 | case bfd_reloc_undefined: |
| 2356 | info->callbacks->undefined_symbol |
| 2357 | (info, name, input_bfd, input_section, rel->r_offset, |
| 2358 | TRUE); |
| 2359 | break; |
| 2360 | |
| 2361 | case bfd_reloc_outofrange: |
| 2362 | if (msg == NULL) |
| 2363 | msg = _("%X%P: internal error: out of range error\n"); |
| 2364 | break; |
| 2365 | |
| 2366 | case bfd_reloc_notsupported: |
| 2367 | if (msg == NULL) |
| 2368 | msg = _("%X%P: internal error: unsupported relocation error\n"); |
| 2369 | break; |
| 2370 | |
| 2371 | case bfd_reloc_dangerous: |
| 2372 | /* The error message should already be set. */ |
| 2373 | if (msg == NULL) |
| 2374 | msg = _("dangerous relocation error"); |
| 2375 | info->callbacks->reloc_dangerous |
| 2376 | (info, msg, input_bfd, input_section, rel->r_offset); |
| 2377 | break; |
| 2378 | |
| 2379 | default: |
| 2380 | msg = _("%X%P: internal error: unknown error\n"); |
| 2381 | break; |
| 2382 | } |
| 2383 | |
| 2384 | /* Do not report error message for the dangerous relocation again. */ |
| 2385 | if (msg && r != bfd_reloc_dangerous) |
| 2386 | info->callbacks->einfo (msg); |
| 2387 | |
| 2388 | /* Free the unused `msg_buf` if needed. */ |
| 2389 | if (msg_buf) |
| 2390 | free (msg_buf); |
| 2391 | |
| 2392 | /* We already reported the error via a callback, so don't try to report |
| 2393 | it again by returning false. That leads to spurious errors. */ |
| 2394 | ret = TRUE; |
| 2395 | goto out; |
| 2396 | } |
| 2397 | |
| 2398 | ret = riscv_resolve_pcrel_lo_relocs (&pcrel_relocs); |
| 2399 | out: |
| 2400 | riscv_free_pcrel_relocs (&pcrel_relocs); |
| 2401 | return ret; |
| 2402 | } |
| 2403 | |
| 2404 | /* Finish up dynamic symbol handling. We set the contents of various |
| 2405 | dynamic sections here. */ |
| 2406 | |
| 2407 | static bfd_boolean |
| 2408 | riscv_elf_finish_dynamic_symbol (bfd *output_bfd, |
| 2409 | struct bfd_link_info *info, |
| 2410 | struct elf_link_hash_entry *h, |
| 2411 | Elf_Internal_Sym *sym) |
| 2412 | { |
| 2413 | struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info); |
| 2414 | const struct elf_backend_data *bed = get_elf_backend_data (output_bfd); |
| 2415 | |
| 2416 | if (h->plt.offset != (bfd_vma) -1) |
| 2417 | { |
| 2418 | /* We've decided to create a PLT entry for this symbol. */ |
| 2419 | bfd_byte *loc; |
| 2420 | bfd_vma i, header_address, plt_idx, got_address; |
| 2421 | uint32_t plt_entry[PLT_ENTRY_INSNS]; |
| 2422 | Elf_Internal_Rela rela; |
| 2423 | |
| 2424 | BFD_ASSERT (h->dynindx != -1); |
| 2425 | |
| 2426 | /* Calculate the address of the PLT header. */ |
| 2427 | header_address = sec_addr (htab->elf.splt); |
| 2428 | |
| 2429 | /* Calculate the index of the entry. */ |
| 2430 | plt_idx = (h->plt.offset - PLT_HEADER_SIZE) / PLT_ENTRY_SIZE; |
| 2431 | |
| 2432 | /* Calculate the address of the .got.plt entry. */ |
| 2433 | got_address = riscv_elf_got_plt_val (plt_idx, info); |
| 2434 | |
| 2435 | /* Find out where the .plt entry should go. */ |
| 2436 | loc = htab->elf.splt->contents + h->plt.offset; |
| 2437 | |
| 2438 | /* Fill in the PLT entry itself. */ |
| 2439 | if (! riscv_make_plt_entry (output_bfd, got_address, |
| 2440 | header_address + h->plt.offset, |
| 2441 | plt_entry)) |
| 2442 | return FALSE; |
| 2443 | |
| 2444 | for (i = 0; i < PLT_ENTRY_INSNS; i++) |
| 2445 | bfd_put_32 (output_bfd, plt_entry[i], loc + 4*i); |
| 2446 | |
| 2447 | /* Fill in the initial value of the .got.plt entry. */ |
| 2448 | loc = htab->elf.sgotplt->contents |
| 2449 | + (got_address - sec_addr (htab->elf.sgotplt)); |
| 2450 | bfd_put_NN (output_bfd, sec_addr (htab->elf.splt), loc); |
| 2451 | |
| 2452 | /* Fill in the entry in the .rela.plt section. */ |
| 2453 | rela.r_offset = got_address; |
| 2454 | rela.r_addend = 0; |
| 2455 | rela.r_info = ELFNN_R_INFO (h->dynindx, R_RISCV_JUMP_SLOT); |
| 2456 | |
| 2457 | loc = htab->elf.srelplt->contents + plt_idx * sizeof (ElfNN_External_Rela); |
| 2458 | bed->s->swap_reloca_out (output_bfd, &rela, loc); |
| 2459 | |
| 2460 | if (!h->def_regular) |
| 2461 | { |
| 2462 | /* Mark the symbol as undefined, rather than as defined in |
| 2463 | the .plt section. Leave the value alone. */ |
| 2464 | sym->st_shndx = SHN_UNDEF; |
| 2465 | /* If the symbol is weak, we do need to clear the value. |
| 2466 | Otherwise, the PLT entry would provide a definition for |
| 2467 | the symbol even if the symbol wasn't defined anywhere, |
| 2468 | and so the symbol would never be NULL. */ |
| 2469 | if (!h->ref_regular_nonweak) |
| 2470 | sym->st_value = 0; |
| 2471 | } |
| 2472 | } |
| 2473 | |
| 2474 | if (h->got.offset != (bfd_vma) -1 |
| 2475 | && !(riscv_elf_hash_entry (h)->tls_type & (GOT_TLS_GD | GOT_TLS_IE)) |
| 2476 | && !UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)) |
| 2477 | { |
| 2478 | asection *sgot; |
| 2479 | asection *srela; |
| 2480 | Elf_Internal_Rela rela; |
| 2481 | |
| 2482 | /* This symbol has an entry in the GOT. Set it up. */ |
| 2483 | |
| 2484 | sgot = htab->elf.sgot; |
| 2485 | srela = htab->elf.srelgot; |
| 2486 | BFD_ASSERT (sgot != NULL && srela != NULL); |
| 2487 | |
| 2488 | rela.r_offset = sec_addr (sgot) + (h->got.offset &~ (bfd_vma) 1); |
| 2489 | |
| 2490 | /* If this is a local symbol reference, we just want to emit a RELATIVE |
| 2491 | reloc. This can happen if it is a -Bsymbolic link, or a pie link, or |
| 2492 | the symbol was forced to be local because of a version file. |
| 2493 | The entry in the global offset table will already have been |
| 2494 | initialized in the relocate_section function. */ |
| 2495 | if (bfd_link_pic (info) |
| 2496 | && SYMBOL_REFERENCES_LOCAL (info, h)) |
| 2497 | { |
| 2498 | BFD_ASSERT((h->got.offset & 1) != 0); |
| 2499 | asection *sec = h->root.u.def.section; |
| 2500 | rela.r_info = ELFNN_R_INFO (0, R_RISCV_RELATIVE); |
| 2501 | rela.r_addend = (h->root.u.def.value |
| 2502 | + sec->output_section->vma |
| 2503 | + sec->output_offset); |
| 2504 | } |
| 2505 | else |
| 2506 | { |
| 2507 | BFD_ASSERT((h->got.offset & 1) == 0); |
| 2508 | BFD_ASSERT (h->dynindx != -1); |
| 2509 | rela.r_info = ELFNN_R_INFO (h->dynindx, R_RISCV_NN); |
| 2510 | rela.r_addend = 0; |
| 2511 | } |
| 2512 | |
| 2513 | bfd_put_NN (output_bfd, 0, |
| 2514 | sgot->contents + (h->got.offset & ~(bfd_vma) 1)); |
| 2515 | riscv_elf_append_rela (output_bfd, srela, &rela); |
| 2516 | } |
| 2517 | |
| 2518 | if (h->needs_copy) |
| 2519 | { |
| 2520 | Elf_Internal_Rela rela; |
| 2521 | asection *s; |
| 2522 | |
| 2523 | /* This symbols needs a copy reloc. Set it up. */ |
| 2524 | BFD_ASSERT (h->dynindx != -1); |
| 2525 | |
| 2526 | rela.r_offset = sec_addr (h->root.u.def.section) + h->root.u.def.value; |
| 2527 | rela.r_info = ELFNN_R_INFO (h->dynindx, R_RISCV_COPY); |
| 2528 | rela.r_addend = 0; |
| 2529 | if (h->root.u.def.section == htab->elf.sdynrelro) |
| 2530 | s = htab->elf.sreldynrelro; |
| 2531 | else |
| 2532 | s = htab->elf.srelbss; |
| 2533 | riscv_elf_append_rela (output_bfd, s, &rela); |
| 2534 | } |
| 2535 | |
| 2536 | /* Mark some specially defined symbols as absolute. */ |
| 2537 | if (h == htab->elf.hdynamic |
| 2538 | || (h == htab->elf.hgot || h == htab->elf.hplt)) |
| 2539 | sym->st_shndx = SHN_ABS; |
| 2540 | |
| 2541 | return TRUE; |
| 2542 | } |
| 2543 | |
| 2544 | /* Finish up the dynamic sections. */ |
| 2545 | |
| 2546 | static bfd_boolean |
| 2547 | riscv_finish_dyn (bfd *output_bfd, struct bfd_link_info *info, |
| 2548 | bfd *dynobj, asection *sdyn) |
| 2549 | { |
| 2550 | struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info); |
| 2551 | const struct elf_backend_data *bed = get_elf_backend_data (output_bfd); |
| 2552 | size_t dynsize = bed->s->sizeof_dyn; |
| 2553 | bfd_byte *dyncon, *dynconend; |
| 2554 | |
| 2555 | dynconend = sdyn->contents + sdyn->size; |
| 2556 | for (dyncon = sdyn->contents; dyncon < dynconend; dyncon += dynsize) |
| 2557 | { |
| 2558 | Elf_Internal_Dyn dyn; |
| 2559 | asection *s; |
| 2560 | |
| 2561 | bed->s->swap_dyn_in (dynobj, dyncon, &dyn); |
| 2562 | |
| 2563 | switch (dyn.d_tag) |
| 2564 | { |
| 2565 | case DT_PLTGOT: |
| 2566 | s = htab->elf.sgotplt; |
| 2567 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; |
| 2568 | break; |
| 2569 | case DT_JMPREL: |
| 2570 | s = htab->elf.srelplt; |
| 2571 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; |
| 2572 | break; |
| 2573 | case DT_PLTRELSZ: |
| 2574 | s = htab->elf.srelplt; |
| 2575 | dyn.d_un.d_val = s->size; |
| 2576 | break; |
| 2577 | default: |
| 2578 | continue; |
| 2579 | } |
| 2580 | |
| 2581 | bed->s->swap_dyn_out (output_bfd, &dyn, dyncon); |
| 2582 | } |
| 2583 | return TRUE; |
| 2584 | } |
| 2585 | |
| 2586 | static bfd_boolean |
| 2587 | riscv_elf_finish_dynamic_sections (bfd *output_bfd, |
| 2588 | struct bfd_link_info *info) |
| 2589 | { |
| 2590 | bfd *dynobj; |
| 2591 | asection *sdyn; |
| 2592 | struct riscv_elf_link_hash_table *htab; |
| 2593 | |
| 2594 | htab = riscv_elf_hash_table (info); |
| 2595 | BFD_ASSERT (htab != NULL); |
| 2596 | dynobj = htab->elf.dynobj; |
| 2597 | |
| 2598 | sdyn = bfd_get_linker_section (dynobj, ".dynamic"); |
| 2599 | |
| 2600 | if (elf_hash_table (info)->dynamic_sections_created) |
| 2601 | { |
| 2602 | asection *splt; |
| 2603 | bfd_boolean ret; |
| 2604 | |
| 2605 | splt = htab->elf.splt; |
| 2606 | BFD_ASSERT (splt != NULL && sdyn != NULL); |
| 2607 | |
| 2608 | ret = riscv_finish_dyn (output_bfd, info, dynobj, sdyn); |
| 2609 | |
| 2610 | if (!ret) |
| 2611 | return ret; |
| 2612 | |
| 2613 | /* Fill in the head and tail entries in the procedure linkage table. */ |
| 2614 | if (splt->size > 0) |
| 2615 | { |
| 2616 | int i; |
| 2617 | uint32_t plt_header[PLT_HEADER_INSNS]; |
| 2618 | ret = riscv_make_plt_header (output_bfd, |
| 2619 | sec_addr (htab->elf.sgotplt), |
| 2620 | sec_addr (splt), plt_header); |
| 2621 | if (!ret) |
| 2622 | return ret; |
| 2623 | |
| 2624 | for (i = 0; i < PLT_HEADER_INSNS; i++) |
| 2625 | bfd_put_32 (output_bfd, plt_header[i], splt->contents + 4*i); |
| 2626 | |
| 2627 | elf_section_data (splt->output_section)->this_hdr.sh_entsize |
| 2628 | = PLT_ENTRY_SIZE; |
| 2629 | } |
| 2630 | } |
| 2631 | |
| 2632 | if (htab->elf.sgotplt) |
| 2633 | { |
| 2634 | asection *output_section = htab->elf.sgotplt->output_section; |
| 2635 | |
| 2636 | if (bfd_is_abs_section (output_section)) |
| 2637 | { |
| 2638 | (*_bfd_error_handler) |
| 2639 | (_("discarded output section: `%pA'"), htab->elf.sgotplt); |
| 2640 | return FALSE; |
| 2641 | } |
| 2642 | |
| 2643 | if (htab->elf.sgotplt->size > 0) |
| 2644 | { |
| 2645 | /* Write the first two entries in .got.plt, needed for the dynamic |
| 2646 | linker. */ |
| 2647 | bfd_put_NN (output_bfd, (bfd_vma) -1, htab->elf.sgotplt->contents); |
| 2648 | bfd_put_NN (output_bfd, (bfd_vma) 0, |
| 2649 | htab->elf.sgotplt->contents + GOT_ENTRY_SIZE); |
| 2650 | } |
| 2651 | |
| 2652 | elf_section_data (output_section)->this_hdr.sh_entsize = GOT_ENTRY_SIZE; |
| 2653 | } |
| 2654 | |
| 2655 | if (htab->elf.sgot) |
| 2656 | { |
| 2657 | asection *output_section = htab->elf.sgot->output_section; |
| 2658 | |
| 2659 | if (htab->elf.sgot->size > 0) |
| 2660 | { |
| 2661 | /* Set the first entry in the global offset table to the address of |
| 2662 | the dynamic section. */ |
| 2663 | bfd_vma val = sdyn ? sec_addr (sdyn) : 0; |
| 2664 | bfd_put_NN (output_bfd, val, htab->elf.sgot->contents); |
| 2665 | } |
| 2666 | |
| 2667 | elf_section_data (output_section)->this_hdr.sh_entsize = GOT_ENTRY_SIZE; |
| 2668 | } |
| 2669 | |
| 2670 | return TRUE; |
| 2671 | } |
| 2672 | |
| 2673 | /* Return address for Ith PLT stub in section PLT, for relocation REL |
| 2674 | or (bfd_vma) -1 if it should not be included. */ |
| 2675 | |
| 2676 | static bfd_vma |
| 2677 | riscv_elf_plt_sym_val (bfd_vma i, const asection *plt, |
| 2678 | const arelent *rel ATTRIBUTE_UNUSED) |
| 2679 | { |
| 2680 | return plt->vma + PLT_HEADER_SIZE + i * PLT_ENTRY_SIZE; |
| 2681 | } |
| 2682 | |
| 2683 | static enum elf_reloc_type_class |
| 2684 | riscv_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 2685 | const asection *rel_sec ATTRIBUTE_UNUSED, |
| 2686 | const Elf_Internal_Rela *rela) |
| 2687 | { |
| 2688 | switch (ELFNN_R_TYPE (rela->r_info)) |
| 2689 | { |
| 2690 | case R_RISCV_RELATIVE: |
| 2691 | return reloc_class_relative; |
| 2692 | case R_RISCV_JUMP_SLOT: |
| 2693 | return reloc_class_plt; |
| 2694 | case R_RISCV_COPY: |
| 2695 | return reloc_class_copy; |
| 2696 | default: |
| 2697 | return reloc_class_normal; |
| 2698 | } |
| 2699 | } |
| 2700 | |
| 2701 | /* Given the ELF header flags in FLAGS, it returns a string that describes the |
| 2702 | float ABI. */ |
| 2703 | |
| 2704 | static const char * |
| 2705 | riscv_float_abi_string (flagword flags) |
| 2706 | { |
| 2707 | switch (flags & EF_RISCV_FLOAT_ABI) |
| 2708 | { |
| 2709 | case EF_RISCV_FLOAT_ABI_SOFT: |
| 2710 | return "soft-float"; |
| 2711 | break; |
| 2712 | case EF_RISCV_FLOAT_ABI_SINGLE: |
| 2713 | return "single-float"; |
| 2714 | break; |
| 2715 | case EF_RISCV_FLOAT_ABI_DOUBLE: |
| 2716 | return "double-float"; |
| 2717 | break; |
| 2718 | case EF_RISCV_FLOAT_ABI_QUAD: |
| 2719 | return "quad-float"; |
| 2720 | break; |
| 2721 | default: |
| 2722 | abort (); |
| 2723 | } |
| 2724 | } |
| 2725 | |
| 2726 | /* The information of architecture attribute. */ |
| 2727 | static riscv_subset_list_t in_subsets; |
| 2728 | static riscv_subset_list_t out_subsets; |
| 2729 | static riscv_subset_list_t merged_subsets; |
| 2730 | |
| 2731 | /* Predicator for standard extension. */ |
| 2732 | |
| 2733 | static bfd_boolean |
| 2734 | riscv_std_ext_p (const char *name) |
| 2735 | { |
| 2736 | return (strlen (name) == 1) && (name[0] != 'x') && (name[0] != 's'); |
| 2737 | } |
| 2738 | |
| 2739 | /* Predicator for non-standard extension. */ |
| 2740 | |
| 2741 | static bfd_boolean |
| 2742 | riscv_non_std_ext_p (const char *name) |
| 2743 | { |
| 2744 | return (strlen (name) >= 2) && (name[0] == 'x'); |
| 2745 | } |
| 2746 | |
| 2747 | /* Predicator for standard supervisor extension. */ |
| 2748 | |
| 2749 | static bfd_boolean |
| 2750 | riscv_std_sv_ext_p (const char *name) |
| 2751 | { |
| 2752 | return (strlen (name) >= 2) && (name[0] == 's') && (name[1] != 'x'); |
| 2753 | } |
| 2754 | |
| 2755 | /* Predicator for non-standard supervisor extension. */ |
| 2756 | |
| 2757 | static bfd_boolean |
| 2758 | riscv_non_std_sv_ext_p (const char *name) |
| 2759 | { |
| 2760 | return (strlen (name) >= 3) && (name[0] == 's') && (name[1] == 'x'); |
| 2761 | } |
| 2762 | |
| 2763 | /* Error handler when version mis-match. */ |
| 2764 | |
| 2765 | static void |
| 2766 | riscv_version_mismatch (bfd *ibfd, |
| 2767 | struct riscv_subset_t *in, |
| 2768 | struct riscv_subset_t *out) |
| 2769 | { |
| 2770 | _bfd_error_handler |
| 2771 | (_("error: %pB: Mis-matched ISA version for '%s' extension. " |
| 2772 | "%d.%d vs %d.%d"), |
| 2773 | ibfd, in->name, |
| 2774 | in->major_version, in->minor_version, |
| 2775 | out->major_version, out->minor_version); |
| 2776 | } |
| 2777 | |
| 2778 | /* Return true if subset is 'i' or 'e'. */ |
| 2779 | |
| 2780 | static bfd_boolean |
| 2781 | riscv_i_or_e_p (bfd *ibfd, |
| 2782 | const char *arch, |
| 2783 | struct riscv_subset_t *subset) |
| 2784 | { |
| 2785 | if ((strcasecmp (subset->name, "e") != 0) |
| 2786 | && (strcasecmp (subset->name, "i") != 0)) |
| 2787 | { |
| 2788 | _bfd_error_handler |
| 2789 | (_("error: %pB: corrupted ISA string '%s'. " |
| 2790 | "First letter should be 'i' or 'e' but got '%s'."), |
| 2791 | ibfd, arch, subset->name); |
| 2792 | return FALSE; |
| 2793 | } |
| 2794 | return TRUE; |
| 2795 | } |
| 2796 | |
| 2797 | /* Merge standard extensions. |
| 2798 | |
| 2799 | Return Value: |
| 2800 | Return FALSE if failed to merge. |
| 2801 | |
| 2802 | Arguments: |
| 2803 | `bfd`: bfd handler. |
| 2804 | `in_arch`: Raw arch string for input object. |
| 2805 | `out_arch`: Raw arch string for output object. |
| 2806 | `pin`: subset list for input object, and it'll skip all merged subset after |
| 2807 | merge. |
| 2808 | `pout`: Like `pin`, but for output object. */ |
| 2809 | |
| 2810 | static bfd_boolean |
| 2811 | riscv_merge_std_ext (bfd *ibfd, |
| 2812 | const char *in_arch, |
| 2813 | const char *out_arch, |
| 2814 | struct riscv_subset_t **pin, |
| 2815 | struct riscv_subset_t **pout) |
| 2816 | { |
| 2817 | const char *standard_exts = riscv_supported_std_ext (); |
| 2818 | const char *p; |
| 2819 | struct riscv_subset_t *in = *pin; |
| 2820 | struct riscv_subset_t *out = *pout; |
| 2821 | |
| 2822 | /* First letter should be 'i' or 'e'. */ |
| 2823 | if (!riscv_i_or_e_p (ibfd, in_arch, in)) |
| 2824 | return FALSE; |
| 2825 | |
| 2826 | if (!riscv_i_or_e_p (ibfd, out_arch, out)) |
| 2827 | return FALSE; |
| 2828 | |
| 2829 | if (in->name[0] != out->name[0]) |
| 2830 | { |
| 2831 | /* TODO: We might allow merge 'i' with 'e'. */ |
| 2832 | _bfd_error_handler |
| 2833 | (_("error: %pB: Mis-matched ISA string to merge '%s' and '%s'."), |
| 2834 | ibfd, in->name, out->name); |
| 2835 | return FALSE; |
| 2836 | } |
| 2837 | else if ((in->major_version != out->major_version) || |
| 2838 | (in->minor_version != out->minor_version)) |
| 2839 | { |
| 2840 | /* TODO: Allow different merge policy. */ |
| 2841 | riscv_version_mismatch (ibfd, in, out); |
| 2842 | return FALSE; |
| 2843 | } |
| 2844 | else |
| 2845 | riscv_add_subset (&merged_subsets, |
| 2846 | in->name, in->major_version, in->minor_version); |
| 2847 | |
| 2848 | in = in->next; |
| 2849 | out = out->next; |
| 2850 | |
| 2851 | /* Handle standard extension first. */ |
| 2852 | for (p = standard_exts; *p; ++p) |
| 2853 | { |
| 2854 | char find_ext[2] = {*p, '\0'}; |
| 2855 | struct riscv_subset_t *find_in = |
| 2856 | riscv_lookup_subset (&in_subsets, find_ext); |
| 2857 | struct riscv_subset_t *find_out = |
| 2858 | riscv_lookup_subset (&out_subsets, find_ext); |
| 2859 | |
| 2860 | if (find_in == NULL && find_out == NULL) |
| 2861 | continue; |
| 2862 | |
| 2863 | /* Check version is same or not. */ |
| 2864 | /* TODO: Allow different merge policy. */ |
| 2865 | if ((find_in != NULL && find_out != NULL) |
| 2866 | && ((find_in->major_version != find_out->major_version) |
| 2867 | || (find_in->minor_version != find_out->minor_version))) |
| 2868 | { |
| 2869 | riscv_version_mismatch (ibfd, in, out); |
| 2870 | return FALSE; |
| 2871 | } |
| 2872 | |
| 2873 | struct riscv_subset_t *merged = find_in ? find_in : find_out; |
| 2874 | riscv_add_subset (&merged_subsets, merged->name, |
| 2875 | merged->major_version, merged->minor_version); |
| 2876 | } |
| 2877 | |
| 2878 | /* Skip all standard extensions. */ |
| 2879 | while ((in != NULL) && riscv_std_ext_p (in->name)) in = in->next; |
| 2880 | while ((out != NULL) && riscv_std_ext_p (out->name)) out = out->next; |
| 2881 | |
| 2882 | *pin = in; |
| 2883 | *pout = out; |
| 2884 | |
| 2885 | return TRUE; |
| 2886 | } |
| 2887 | |
| 2888 | /* Merge non-standard and supervisor extensions. |
| 2889 | Return Value: |
| 2890 | Return FALSE if failed to merge. |
| 2891 | |
| 2892 | Arguments: |
| 2893 | `bfd`: bfd handler. |
| 2894 | `in_arch`: Raw arch string for input object. |
| 2895 | `out_arch`: Raw arch string for output object. |
| 2896 | `pin`: subset list for input object, and it'll skip all merged subset after |
| 2897 | merge. |
| 2898 | `pout`: Like `pin`, but for output object. */ |
| 2899 | |
| 2900 | static bfd_boolean |
| 2901 | riscv_merge_non_std_and_sv_ext (bfd *ibfd, |
| 2902 | riscv_subset_t **pin, |
| 2903 | riscv_subset_t **pout, |
| 2904 | bfd_boolean (*predicate_func) (const char *)) |
| 2905 | { |
| 2906 | riscv_subset_t *in = *pin; |
| 2907 | riscv_subset_t *out = *pout; |
| 2908 | |
| 2909 | for (in = *pin; in != NULL && predicate_func (in->name); in = in->next) |
| 2910 | riscv_add_subset (&merged_subsets, in->name, in->major_version, |
| 2911 | in->minor_version); |
| 2912 | |
| 2913 | for (out = *pout; out != NULL && predicate_func (out->name); out = out->next) |
| 2914 | { |
| 2915 | riscv_subset_t *find_ext = |
| 2916 | riscv_lookup_subset (&merged_subsets, out->name); |
| 2917 | if (find_ext != NULL) |
| 2918 | { |
| 2919 | /* Check version is same or not. */ |
| 2920 | /* TODO: Allow different merge policy. */ |
| 2921 | if ((find_ext->major_version != out->major_version) |
| 2922 | || (find_ext->minor_version != out->minor_version)) |
| 2923 | { |
| 2924 | riscv_version_mismatch (ibfd, find_ext, out); |
| 2925 | return FALSE; |
| 2926 | } |
| 2927 | } |
| 2928 | else |
| 2929 | riscv_add_subset (&merged_subsets, out->name, |
| 2930 | out->major_version, out->minor_version); |
| 2931 | } |
| 2932 | |
| 2933 | *pin = in; |
| 2934 | *pout = out; |
| 2935 | return TRUE; |
| 2936 | } |
| 2937 | |
| 2938 | /* Merge Tag_RISCV_arch attribute. */ |
| 2939 | |
| 2940 | static char * |
| 2941 | riscv_merge_arch_attr_info (bfd *ibfd, char *in_arch, char *out_arch) |
| 2942 | { |
| 2943 | riscv_subset_t *in, *out; |
| 2944 | char *merged_arch_str; |
| 2945 | |
| 2946 | unsigned xlen_in, xlen_out; |
| 2947 | merged_subsets.head = NULL; |
| 2948 | merged_subsets.tail = NULL; |
| 2949 | |
| 2950 | riscv_parse_subset_t rpe_in; |
| 2951 | riscv_parse_subset_t rpe_out; |
| 2952 | |
| 2953 | rpe_in.subset_list = &in_subsets; |
| 2954 | rpe_in.error_handler = _bfd_error_handler; |
| 2955 | rpe_in.xlen = &xlen_in; |
| 2956 | |
| 2957 | rpe_out.subset_list = &out_subsets; |
| 2958 | rpe_out.error_handler = _bfd_error_handler; |
| 2959 | rpe_out.xlen = &xlen_out; |
| 2960 | |
| 2961 | if (in_arch == NULL && out_arch == NULL) |
| 2962 | return NULL; |
| 2963 | |
| 2964 | if (in_arch == NULL && out_arch != NULL) |
| 2965 | return out_arch; |
| 2966 | |
| 2967 | if (in_arch != NULL && out_arch == NULL) |
| 2968 | return in_arch; |
| 2969 | |
| 2970 | /* Parse subset from arch string. */ |
| 2971 | if (!riscv_parse_subset (&rpe_in, in_arch)) |
| 2972 | return NULL; |
| 2973 | |
| 2974 | if (!riscv_parse_subset (&rpe_out, out_arch)) |
| 2975 | return NULL; |
| 2976 | |
| 2977 | /* Checking XLEN. */ |
| 2978 | if (xlen_out != xlen_in) |
| 2979 | { |
| 2980 | _bfd_error_handler |
| 2981 | (_("error: %pB: ISA string of input (%s) doesn't match " |
| 2982 | "output (%s)."), ibfd, in_arch, out_arch); |
| 2983 | return NULL; |
| 2984 | } |
| 2985 | |
| 2986 | /* Merge subset list. */ |
| 2987 | in = in_subsets.head; |
| 2988 | out = out_subsets.head; |
| 2989 | |
| 2990 | /* Merge standard extension. */ |
| 2991 | if (!riscv_merge_std_ext (ibfd, in_arch, out_arch, &in, &out)) |
| 2992 | return NULL; |
| 2993 | /* Merge non-standard extension. */ |
| 2994 | if (!riscv_merge_non_std_and_sv_ext (ibfd, &in, &out, riscv_non_std_ext_p)) |
| 2995 | return NULL; |
| 2996 | /* Merge standard supervisor extension. */ |
| 2997 | if (!riscv_merge_non_std_and_sv_ext (ibfd, &in, &out, riscv_std_sv_ext_p)) |
| 2998 | return NULL; |
| 2999 | /* Merge non-standard supervisor extension. */ |
| 3000 | if (!riscv_merge_non_std_and_sv_ext (ibfd, &in, &out, riscv_non_std_sv_ext_p)) |
| 3001 | return NULL; |
| 3002 | |
| 3003 | if (xlen_in != xlen_out) |
| 3004 | { |
| 3005 | _bfd_error_handler |
| 3006 | (_("error: %pB: XLEN of input (%u) doesn't match " |
| 3007 | "output (%u)."), ibfd, xlen_in, xlen_out); |
| 3008 | return NULL; |
| 3009 | } |
| 3010 | |
| 3011 | if (xlen_in != ARCH_SIZE) |
| 3012 | { |
| 3013 | _bfd_error_handler |
| 3014 | (_("error: %pB: Unsupported XLEN (%u), you might be " |
| 3015 | "using wrong emulation."), ibfd, xlen_in); |
| 3016 | return NULL; |
| 3017 | } |
| 3018 | |
| 3019 | merged_arch_str = riscv_arch_str (ARCH_SIZE, &merged_subsets); |
| 3020 | |
| 3021 | /* Release the subset lists. */ |
| 3022 | riscv_release_subset_list (&in_subsets); |
| 3023 | riscv_release_subset_list (&out_subsets); |
| 3024 | riscv_release_subset_list (&merged_subsets); |
| 3025 | |
| 3026 | return merged_arch_str; |
| 3027 | } |
| 3028 | |
| 3029 | /* Merge object attributes from IBFD into output_bfd of INFO. |
| 3030 | Raise an error if there are conflicting attributes. */ |
| 3031 | |
| 3032 | static bfd_boolean |
| 3033 | riscv_merge_attributes (bfd *ibfd, struct bfd_link_info *info) |
| 3034 | { |
| 3035 | bfd *obfd = info->output_bfd; |
| 3036 | obj_attribute *in_attr; |
| 3037 | obj_attribute *out_attr; |
| 3038 | bfd_boolean result = TRUE; |
| 3039 | const char *sec_name = get_elf_backend_data (ibfd)->obj_attrs_section; |
| 3040 | unsigned int i; |
| 3041 | |
| 3042 | /* Skip linker created files. */ |
| 3043 | if (ibfd->flags & BFD_LINKER_CREATED) |
| 3044 | return TRUE; |
| 3045 | |
| 3046 | /* Skip any input that doesn't have an attribute section. |
| 3047 | This enables to link object files without attribute section with |
| 3048 | any others. */ |
| 3049 | if (bfd_get_section_by_name (ibfd, sec_name) == NULL) |
| 3050 | return TRUE; |
| 3051 | |
| 3052 | if (!elf_known_obj_attributes_proc (obfd)[0].i) |
| 3053 | { |
| 3054 | /* This is the first object. Copy the attributes. */ |
| 3055 | _bfd_elf_copy_obj_attributes (ibfd, obfd); |
| 3056 | |
| 3057 | out_attr = elf_known_obj_attributes_proc (obfd); |
| 3058 | |
| 3059 | /* Use the Tag_null value to indicate the attributes have been |
| 3060 | initialized. */ |
| 3061 | out_attr[0].i = 1; |
| 3062 | |
| 3063 | return TRUE; |
| 3064 | } |
| 3065 | |
| 3066 | in_attr = elf_known_obj_attributes_proc (ibfd); |
| 3067 | out_attr = elf_known_obj_attributes_proc (obfd); |
| 3068 | |
| 3069 | for (i = LEAST_KNOWN_OBJ_ATTRIBUTE; i < NUM_KNOWN_OBJ_ATTRIBUTES; i++) |
| 3070 | { |
| 3071 | switch (i) |
| 3072 | { |
| 3073 | case Tag_RISCV_arch: |
| 3074 | if (!out_attr[Tag_RISCV_arch].s) |
| 3075 | out_attr[Tag_RISCV_arch].s = in_attr[Tag_RISCV_arch].s; |
| 3076 | else if (in_attr[Tag_RISCV_arch].s |
| 3077 | && out_attr[Tag_RISCV_arch].s) |
| 3078 | { |
| 3079 | /* Check arch compatible. */ |
| 3080 | char *merged_arch = |
| 3081 | riscv_merge_arch_attr_info (ibfd, |
| 3082 | in_attr[Tag_RISCV_arch].s, |
| 3083 | out_attr[Tag_RISCV_arch].s); |
| 3084 | if (merged_arch == NULL) |
| 3085 | { |
| 3086 | result = FALSE; |
| 3087 | out_attr[Tag_RISCV_arch].s = ""; |
| 3088 | } |
| 3089 | else |
| 3090 | out_attr[Tag_RISCV_arch].s = merged_arch; |
| 3091 | } |
| 3092 | break; |
| 3093 | case Tag_RISCV_priv_spec: |
| 3094 | case Tag_RISCV_priv_spec_minor: |
| 3095 | case Tag_RISCV_priv_spec_revision: |
| 3096 | if (out_attr[i].i != in_attr[i].i) |
| 3097 | { |
| 3098 | _bfd_error_handler |
| 3099 | (_("error: %pB: conflicting priv spec version " |
| 3100 | "(major/minor/revision)."), ibfd); |
| 3101 | result = FALSE; |
| 3102 | } |
| 3103 | break; |
| 3104 | case Tag_RISCV_unaligned_access: |
| 3105 | out_attr[i].i |= in_attr[i].i; |
| 3106 | break; |
| 3107 | case Tag_RISCV_stack_align: |
| 3108 | if (out_attr[i].i == 0) |
| 3109 | out_attr[i].i = in_attr[i].i; |
| 3110 | else if (in_attr[i].i != 0 |
| 3111 | && out_attr[i].i != 0 |
| 3112 | && out_attr[i].i != in_attr[i].i) |
| 3113 | { |
| 3114 | _bfd_error_handler |
| 3115 | (_("error: %pB use %u-byte stack aligned but the output " |
| 3116 | "use %u-byte stack aligned."), |
| 3117 | ibfd, in_attr[i].i, out_attr[i].i); |
| 3118 | result = FALSE; |
| 3119 | } |
| 3120 | break; |
| 3121 | default: |
| 3122 | result &= _bfd_elf_merge_unknown_attribute_low (ibfd, obfd, i); |
| 3123 | } |
| 3124 | |
| 3125 | /* If out_attr was copied from in_attr then it won't have a type yet. */ |
| 3126 | if (in_attr[i].type && !out_attr[i].type) |
| 3127 | out_attr[i].type = in_attr[i].type; |
| 3128 | } |
| 3129 | |
| 3130 | /* Merge Tag_compatibility attributes and any common GNU ones. */ |
| 3131 | if (!_bfd_elf_merge_object_attributes (ibfd, info)) |
| 3132 | return FALSE; |
| 3133 | |
| 3134 | /* Check for any attributes not known on RISC-V. */ |
| 3135 | result &= _bfd_elf_merge_unknown_attribute_list (ibfd, obfd); |
| 3136 | |
| 3137 | return result; |
| 3138 | } |
| 3139 | |
| 3140 | /* Merge backend specific data from an object file to the output |
| 3141 | object file when linking. */ |
| 3142 | |
| 3143 | static bfd_boolean |
| 3144 | _bfd_riscv_elf_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info) |
| 3145 | { |
| 3146 | bfd *obfd = info->output_bfd; |
| 3147 | flagword new_flags, old_flags; |
| 3148 | |
| 3149 | if (!is_riscv_elf (ibfd) || !is_riscv_elf (obfd)) |
| 3150 | return TRUE; |
| 3151 | |
| 3152 | if (strcmp (bfd_get_target (ibfd), bfd_get_target (obfd)) != 0) |
| 3153 | { |
| 3154 | (*_bfd_error_handler) |
| 3155 | (_("%pB: ABI is incompatible with that of the selected emulation:\n" |
| 3156 | " target emulation `%s' does not match `%s'"), |
| 3157 | ibfd, bfd_get_target (ibfd), bfd_get_target (obfd)); |
| 3158 | return FALSE; |
| 3159 | } |
| 3160 | |
| 3161 | if (!_bfd_elf_merge_object_attributes (ibfd, info)) |
| 3162 | return FALSE; |
| 3163 | |
| 3164 | if (!riscv_merge_attributes (ibfd, info)) |
| 3165 | return FALSE; |
| 3166 | |
| 3167 | new_flags = elf_elfheader (ibfd)->e_flags; |
| 3168 | old_flags = elf_elfheader (obfd)->e_flags; |
| 3169 | |
| 3170 | if (! elf_flags_init (obfd)) |
| 3171 | { |
| 3172 | elf_flags_init (obfd) = TRUE; |
| 3173 | elf_elfheader (obfd)->e_flags = new_flags; |
| 3174 | return TRUE; |
| 3175 | } |
| 3176 | |
| 3177 | /* Check to see if the input BFD actually contains any sections. If not, |
| 3178 | its flags may not have been initialized either, but it cannot actually |
| 3179 | cause any incompatibility. Do not short-circuit dynamic objects; their |
| 3180 | section list may be emptied by elf_link_add_object_symbols. |
| 3181 | |
| 3182 | Also check to see if there are no code sections in the input. In this |
| 3183 | case, there is no need to check for code specific flags. */ |
| 3184 | if (!(ibfd->flags & DYNAMIC)) |
| 3185 | { |
| 3186 | bfd_boolean null_input_bfd = TRUE; |
| 3187 | bfd_boolean only_data_sections = TRUE; |
| 3188 | asection *sec; |
| 3189 | |
| 3190 | for (sec = ibfd->sections; sec != NULL; sec = sec->next) |
| 3191 | { |
| 3192 | if ((bfd_section_flags (sec) |
| 3193 | & (SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS)) |
| 3194 | == (SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS)) |
| 3195 | only_data_sections = FALSE; |
| 3196 | |
| 3197 | null_input_bfd = FALSE; |
| 3198 | break; |
| 3199 | } |
| 3200 | |
| 3201 | if (null_input_bfd || only_data_sections) |
| 3202 | return TRUE; |
| 3203 | } |
| 3204 | |
| 3205 | /* Disallow linking different float ABIs. */ |
| 3206 | if ((old_flags ^ new_flags) & EF_RISCV_FLOAT_ABI) |
| 3207 | { |
| 3208 | (*_bfd_error_handler) |
| 3209 | (_("%pB: can't link %s modules with %s modules"), ibfd, |
| 3210 | riscv_float_abi_string (new_flags), |
| 3211 | riscv_float_abi_string (old_flags)); |
| 3212 | goto fail; |
| 3213 | } |
| 3214 | |
| 3215 | /* Disallow linking RVE and non-RVE. */ |
| 3216 | if ((old_flags ^ new_flags) & EF_RISCV_RVE) |
| 3217 | { |
| 3218 | (*_bfd_error_handler) |
| 3219 | (_("%pB: can't link RVE with other target"), ibfd); |
| 3220 | goto fail; |
| 3221 | } |
| 3222 | |
| 3223 | /* Allow linking RVC and non-RVC, and keep the RVC flag. */ |
| 3224 | elf_elfheader (obfd)->e_flags |= new_flags & EF_RISCV_RVC; |
| 3225 | |
| 3226 | return TRUE; |
| 3227 | |
| 3228 | fail: |
| 3229 | bfd_set_error (bfd_error_bad_value); |
| 3230 | return FALSE; |
| 3231 | } |
| 3232 | |
| 3233 | /* Delete some bytes from a section while relaxing. */ |
| 3234 | |
| 3235 | static bfd_boolean |
| 3236 | riscv_relax_delete_bytes (bfd *abfd, asection *sec, bfd_vma addr, size_t count, |
| 3237 | struct bfd_link_info *link_info) |
| 3238 | { |
| 3239 | unsigned int i, symcount; |
| 3240 | bfd_vma toaddr = sec->size; |
| 3241 | struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (abfd); |
| 3242 | Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 3243 | unsigned int sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); |
| 3244 | struct bfd_elf_section_data *data = elf_section_data (sec); |
| 3245 | bfd_byte *contents = data->this_hdr.contents; |
| 3246 | |
| 3247 | /* Actually delete the bytes. */ |
| 3248 | sec->size -= count; |
| 3249 | memmove (contents + addr, contents + addr + count, toaddr - addr - count); |
| 3250 | |
| 3251 | /* Adjust the location of all of the relocs. Note that we need not |
| 3252 | adjust the addends, since all PC-relative references must be against |
| 3253 | symbols, which we will adjust below. */ |
| 3254 | for (i = 0; i < sec->reloc_count; i++) |
| 3255 | if (data->relocs[i].r_offset > addr && data->relocs[i].r_offset < toaddr) |
| 3256 | data->relocs[i].r_offset -= count; |
| 3257 | |
| 3258 | /* Adjust the local symbols defined in this section. */ |
| 3259 | for (i = 0; i < symtab_hdr->sh_info; i++) |
| 3260 | { |
| 3261 | Elf_Internal_Sym *sym = (Elf_Internal_Sym *) symtab_hdr->contents + i; |
| 3262 | if (sym->st_shndx == sec_shndx) |
| 3263 | { |
| 3264 | /* If the symbol is in the range of memory we just moved, we |
| 3265 | have to adjust its value. */ |
| 3266 | if (sym->st_value > addr && sym->st_value <= toaddr) |
| 3267 | sym->st_value -= count; |
| 3268 | |
| 3269 | /* If the symbol *spans* the bytes we just deleted (i.e. its |
| 3270 | *end* is in the moved bytes but its *start* isn't), then we |
| 3271 | must adjust its size. |
| 3272 | |
| 3273 | This test needs to use the original value of st_value, otherwise |
| 3274 | we might accidentally decrease size when deleting bytes right |
| 3275 | before the symbol. But since deleted relocs can't span across |
| 3276 | symbols, we can't have both a st_value and a st_size decrease, |
| 3277 | so it is simpler to just use an else. */ |
| 3278 | else if (sym->st_value <= addr |
| 3279 | && sym->st_value + sym->st_size > addr |
| 3280 | && sym->st_value + sym->st_size <= toaddr) |
| 3281 | sym->st_size -= count; |
| 3282 | } |
| 3283 | } |
| 3284 | |
| 3285 | /* Now adjust the global symbols defined in this section. */ |
| 3286 | symcount = ((symtab_hdr->sh_size / sizeof (ElfNN_External_Sym)) |
| 3287 | - symtab_hdr->sh_info); |
| 3288 | |
| 3289 | for (i = 0; i < symcount; i++) |
| 3290 | { |
| 3291 | struct elf_link_hash_entry *sym_hash = sym_hashes[i]; |
| 3292 | |
| 3293 | /* The '--wrap SYMBOL' option is causing a pain when the object file, |
| 3294 | containing the definition of __wrap_SYMBOL, includes a direct |
| 3295 | call to SYMBOL as well. Since both __wrap_SYMBOL and SYMBOL reference |
| 3296 | the same symbol (which is __wrap_SYMBOL), but still exist as two |
| 3297 | different symbols in 'sym_hashes', we don't want to adjust |
| 3298 | the global symbol __wrap_SYMBOL twice. */ |
| 3299 | /* The same problem occurs with symbols that are versioned_hidden, as |
| 3300 | foo becomes an alias for foo@BAR, and hence they need the same |
| 3301 | treatment. */ |
| 3302 | if (link_info->wrap_hash != NULL |
| 3303 | || sym_hash->versioned == versioned_hidden) |
| 3304 | { |
| 3305 | struct elf_link_hash_entry **cur_sym_hashes; |
| 3306 | |
| 3307 | /* Loop only over the symbols which have already been checked. */ |
| 3308 | for (cur_sym_hashes = sym_hashes; cur_sym_hashes < &sym_hashes[i]; |
| 3309 | cur_sym_hashes++) |
| 3310 | { |
| 3311 | /* If the current symbol is identical to 'sym_hash', that means |
| 3312 | the symbol was already adjusted (or at least checked). */ |
| 3313 | if (*cur_sym_hashes == sym_hash) |
| 3314 | break; |
| 3315 | } |
| 3316 | /* Don't adjust the symbol again. */ |
| 3317 | if (cur_sym_hashes < &sym_hashes[i]) |
| 3318 | continue; |
| 3319 | } |
| 3320 | |
| 3321 | if ((sym_hash->root.type == bfd_link_hash_defined |
| 3322 | || sym_hash->root.type == bfd_link_hash_defweak) |
| 3323 | && sym_hash->root.u.def.section == sec) |
| 3324 | { |
| 3325 | /* As above, adjust the value if needed. */ |
| 3326 | if (sym_hash->root.u.def.value > addr |
| 3327 | && sym_hash->root.u.def.value <= toaddr) |
| 3328 | sym_hash->root.u.def.value -= count; |
| 3329 | |
| 3330 | /* As above, adjust the size if needed. */ |
| 3331 | else if (sym_hash->root.u.def.value <= addr |
| 3332 | && sym_hash->root.u.def.value + sym_hash->size > addr |
| 3333 | && sym_hash->root.u.def.value + sym_hash->size <= toaddr) |
| 3334 | sym_hash->size -= count; |
| 3335 | } |
| 3336 | } |
| 3337 | |
| 3338 | return TRUE; |
| 3339 | } |
| 3340 | |
| 3341 | /* A second format for recording PC-relative hi relocations. This stores the |
| 3342 | information required to relax them to GP-relative addresses. */ |
| 3343 | |
| 3344 | typedef struct riscv_pcgp_hi_reloc riscv_pcgp_hi_reloc; |
| 3345 | struct riscv_pcgp_hi_reloc |
| 3346 | { |
| 3347 | bfd_vma hi_sec_off; |
| 3348 | bfd_vma hi_addend; |
| 3349 | bfd_vma hi_addr; |
| 3350 | unsigned hi_sym; |
| 3351 | asection *sym_sec; |
| 3352 | bfd_boolean undefined_weak; |
| 3353 | riscv_pcgp_hi_reloc *next; |
| 3354 | }; |
| 3355 | |
| 3356 | typedef struct riscv_pcgp_lo_reloc riscv_pcgp_lo_reloc; |
| 3357 | struct riscv_pcgp_lo_reloc |
| 3358 | { |
| 3359 | bfd_vma hi_sec_off; |
| 3360 | riscv_pcgp_lo_reloc *next; |
| 3361 | }; |
| 3362 | |
| 3363 | typedef struct |
| 3364 | { |
| 3365 | riscv_pcgp_hi_reloc *hi; |
| 3366 | riscv_pcgp_lo_reloc *lo; |
| 3367 | } riscv_pcgp_relocs; |
| 3368 | |
| 3369 | /* Initialize the pcgp reloc info in P. */ |
| 3370 | |
| 3371 | static bfd_boolean |
| 3372 | riscv_init_pcgp_relocs (riscv_pcgp_relocs *p) |
| 3373 | { |
| 3374 | p->hi = NULL; |
| 3375 | p->lo = NULL; |
| 3376 | return TRUE; |
| 3377 | } |
| 3378 | |
| 3379 | /* Free the pcgp reloc info in P. */ |
| 3380 | |
| 3381 | static void |
| 3382 | riscv_free_pcgp_relocs (riscv_pcgp_relocs *p, |
| 3383 | bfd *abfd ATTRIBUTE_UNUSED, |
| 3384 | asection *sec ATTRIBUTE_UNUSED) |
| 3385 | { |
| 3386 | riscv_pcgp_hi_reloc *c; |
| 3387 | riscv_pcgp_lo_reloc *l; |
| 3388 | |
| 3389 | for (c = p->hi; c != NULL;) |
| 3390 | { |
| 3391 | riscv_pcgp_hi_reloc *next = c->next; |
| 3392 | free (c); |
| 3393 | c = next; |
| 3394 | } |
| 3395 | |
| 3396 | for (l = p->lo; l != NULL;) |
| 3397 | { |
| 3398 | riscv_pcgp_lo_reloc *next = l->next; |
| 3399 | free (l); |
| 3400 | l = next; |
| 3401 | } |
| 3402 | } |
| 3403 | |
| 3404 | /* Record pcgp hi part reloc info in P, using HI_SEC_OFF as the lookup index. |
| 3405 | The HI_ADDEND, HI_ADDR, HI_SYM, and SYM_SEC args contain info required to |
| 3406 | relax the corresponding lo part reloc. */ |
| 3407 | |
| 3408 | static bfd_boolean |
| 3409 | riscv_record_pcgp_hi_reloc (riscv_pcgp_relocs *p, bfd_vma hi_sec_off, |
| 3410 | bfd_vma hi_addend, bfd_vma hi_addr, |
| 3411 | unsigned hi_sym, asection *sym_sec, |
| 3412 | bfd_boolean undefined_weak) |
| 3413 | { |
| 3414 | riscv_pcgp_hi_reloc *new = bfd_malloc (sizeof(*new)); |
| 3415 | if (!new) |
| 3416 | return FALSE; |
| 3417 | new->hi_sec_off = hi_sec_off; |
| 3418 | new->hi_addend = hi_addend; |
| 3419 | new->hi_addr = hi_addr; |
| 3420 | new->hi_sym = hi_sym; |
| 3421 | new->sym_sec = sym_sec; |
| 3422 | new->undefined_weak = undefined_weak; |
| 3423 | new->next = p->hi; |
| 3424 | p->hi = new; |
| 3425 | return TRUE; |
| 3426 | } |
| 3427 | |
| 3428 | /* Look up hi part pcgp reloc info in P, using HI_SEC_OFF as the lookup index. |
| 3429 | This is used by a lo part reloc to find the corresponding hi part reloc. */ |
| 3430 | |
| 3431 | static riscv_pcgp_hi_reloc * |
| 3432 | riscv_find_pcgp_hi_reloc(riscv_pcgp_relocs *p, bfd_vma hi_sec_off) |
| 3433 | { |
| 3434 | riscv_pcgp_hi_reloc *c; |
| 3435 | |
| 3436 | for (c = p->hi; c != NULL; c = c->next) |
| 3437 | if (c->hi_sec_off == hi_sec_off) |
| 3438 | return c; |
| 3439 | return NULL; |
| 3440 | } |
| 3441 | |
| 3442 | /* Record pcgp lo part reloc info in P, using HI_SEC_OFF as the lookup info. |
| 3443 | This is used to record relocs that can't be relaxed. */ |
| 3444 | |
| 3445 | static bfd_boolean |
| 3446 | riscv_record_pcgp_lo_reloc (riscv_pcgp_relocs *p, bfd_vma hi_sec_off) |
| 3447 | { |
| 3448 | riscv_pcgp_lo_reloc *new = bfd_malloc (sizeof(*new)); |
| 3449 | if (!new) |
| 3450 | return FALSE; |
| 3451 | new->hi_sec_off = hi_sec_off; |
| 3452 | new->next = p->lo; |
| 3453 | p->lo = new; |
| 3454 | return TRUE; |
| 3455 | } |
| 3456 | |
| 3457 | /* Look up lo part pcgp reloc info in P, using HI_SEC_OFF as the lookup index. |
| 3458 | This is used by a hi part reloc to find the corresponding lo part reloc. */ |
| 3459 | |
| 3460 | static bfd_boolean |
| 3461 | riscv_find_pcgp_lo_reloc (riscv_pcgp_relocs *p, bfd_vma hi_sec_off) |
| 3462 | { |
| 3463 | riscv_pcgp_lo_reloc *c; |
| 3464 | |
| 3465 | for (c = p->lo; c != NULL; c = c->next) |
| 3466 | if (c->hi_sec_off == hi_sec_off) |
| 3467 | return TRUE; |
| 3468 | return FALSE; |
| 3469 | } |
| 3470 | |
| 3471 | typedef bfd_boolean (*relax_func_t) (bfd *, asection *, asection *, |
| 3472 | struct bfd_link_info *, |
| 3473 | Elf_Internal_Rela *, |
| 3474 | bfd_vma, bfd_vma, bfd_vma, bfd_boolean *, |
| 3475 | riscv_pcgp_relocs *, |
| 3476 | bfd_boolean undefined_weak); |
| 3477 | |
| 3478 | /* Relax AUIPC + JALR into JAL. */ |
| 3479 | |
| 3480 | static bfd_boolean |
| 3481 | _bfd_riscv_relax_call (bfd *abfd, asection *sec, asection *sym_sec, |
| 3482 | struct bfd_link_info *link_info, |
| 3483 | Elf_Internal_Rela *rel, |
| 3484 | bfd_vma symval, |
| 3485 | bfd_vma max_alignment, |
| 3486 | bfd_vma reserve_size ATTRIBUTE_UNUSED, |
| 3487 | bfd_boolean *again, |
| 3488 | riscv_pcgp_relocs *pcgp_relocs ATTRIBUTE_UNUSED, |
| 3489 | bfd_boolean undefined_weak ATTRIBUTE_UNUSED) |
| 3490 | { |
| 3491 | bfd_byte *contents = elf_section_data (sec)->this_hdr.contents; |
| 3492 | bfd_signed_vma foff = symval - (sec_addr (sec) + rel->r_offset); |
| 3493 | bfd_boolean near_zero = (symval + RISCV_IMM_REACH/2) < RISCV_IMM_REACH; |
| 3494 | bfd_vma auipc, jalr; |
| 3495 | int rd, r_type, len = 4, rvc = elf_elfheader (abfd)->e_flags & EF_RISCV_RVC; |
| 3496 | |
| 3497 | /* If the call crosses section boundaries, an alignment directive could |
| 3498 | cause the PC-relative offset to later increase, so we need to add in the |
| 3499 | max alignment of any section inclusive from the call to the target. |
| 3500 | Otherwise, we only need to use the alignment of the current section. */ |
| 3501 | if (VALID_UJTYPE_IMM (foff)) |
| 3502 | { |
| 3503 | if (sym_sec->output_section == sec->output_section |
| 3504 | && sym_sec->output_section != bfd_abs_section_ptr) |
| 3505 | max_alignment = (bfd_vma) 1 << sym_sec->output_section->alignment_power; |
| 3506 | foff += (foff < 0 ? -max_alignment : max_alignment); |
| 3507 | } |
| 3508 | |
| 3509 | /* See if this function call can be shortened. */ |
| 3510 | if (!VALID_UJTYPE_IMM (foff) && !(!bfd_link_pic (link_info) && near_zero)) |
| 3511 | return TRUE; |
| 3512 | |
| 3513 | /* Shorten the function call. */ |
| 3514 | BFD_ASSERT (rel->r_offset + 8 <= sec->size); |
| 3515 | |
| 3516 | auipc = bfd_get_32 (abfd, contents + rel->r_offset); |
| 3517 | jalr = bfd_get_32 (abfd, contents + rel->r_offset + 4); |
| 3518 | rd = (jalr >> OP_SH_RD) & OP_MASK_RD; |
| 3519 | rvc = rvc && VALID_RVC_J_IMM (foff); |
| 3520 | |
| 3521 | /* C.J exists on RV32 and RV64, but C.JAL is RV32-only. */ |
| 3522 | rvc = rvc && (rd == 0 || (rd == X_RA && ARCH_SIZE == 32)); |
| 3523 | |
| 3524 | if (rvc) |
| 3525 | { |
| 3526 | /* Relax to C.J[AL] rd, addr. */ |
| 3527 | r_type = R_RISCV_RVC_JUMP; |
| 3528 | auipc = rd == 0 ? MATCH_C_J : MATCH_C_JAL; |
| 3529 | len = 2; |
| 3530 | } |
| 3531 | else if (VALID_UJTYPE_IMM (foff)) |
| 3532 | { |
| 3533 | /* Relax to JAL rd, addr. */ |
| 3534 | r_type = R_RISCV_JAL; |
| 3535 | auipc = MATCH_JAL | (rd << OP_SH_RD); |
| 3536 | } |
| 3537 | else /* near_zero */ |
| 3538 | { |
| 3539 | /* Relax to JALR rd, x0, addr. */ |
| 3540 | r_type = R_RISCV_LO12_I; |
| 3541 | auipc = MATCH_JALR | (rd << OP_SH_RD); |
| 3542 | } |
| 3543 | |
| 3544 | /* Replace the R_RISCV_CALL reloc. */ |
| 3545 | rel->r_info = ELFNN_R_INFO (ELFNN_R_SYM (rel->r_info), r_type); |
| 3546 | /* Replace the AUIPC. */ |
| 3547 | bfd_put (8 * len, abfd, auipc, contents + rel->r_offset); |
| 3548 | |
| 3549 | /* Delete unnecessary JALR. */ |
| 3550 | *again = TRUE; |
| 3551 | return riscv_relax_delete_bytes (abfd, sec, rel->r_offset + len, 8 - len, |
| 3552 | link_info); |
| 3553 | } |
| 3554 | |
| 3555 | /* Traverse all output sections and return the max alignment. */ |
| 3556 | |
| 3557 | static bfd_vma |
| 3558 | _bfd_riscv_get_max_alignment (asection *sec) |
| 3559 | { |
| 3560 | unsigned int max_alignment_power = 0; |
| 3561 | asection *o; |
| 3562 | |
| 3563 | for (o = sec->output_section->owner->sections; o != NULL; o = o->next) |
| 3564 | { |
| 3565 | if (o->alignment_power > max_alignment_power) |
| 3566 | max_alignment_power = o->alignment_power; |
| 3567 | } |
| 3568 | |
| 3569 | return (bfd_vma) 1 << max_alignment_power; |
| 3570 | } |
| 3571 | |
| 3572 | /* Relax non-PIC global variable references. */ |
| 3573 | |
| 3574 | static bfd_boolean |
| 3575 | _bfd_riscv_relax_lui (bfd *abfd, |
| 3576 | asection *sec, |
| 3577 | asection *sym_sec, |
| 3578 | struct bfd_link_info *link_info, |
| 3579 | Elf_Internal_Rela *rel, |
| 3580 | bfd_vma symval, |
| 3581 | bfd_vma max_alignment, |
| 3582 | bfd_vma reserve_size, |
| 3583 | bfd_boolean *again, |
| 3584 | riscv_pcgp_relocs *pcgp_relocs ATTRIBUTE_UNUSED, |
| 3585 | bfd_boolean undefined_weak) |
| 3586 | { |
| 3587 | bfd_byte *contents = elf_section_data (sec)->this_hdr.contents; |
| 3588 | bfd_vma gp = riscv_global_pointer_value (link_info); |
| 3589 | int use_rvc = elf_elfheader (abfd)->e_flags & EF_RISCV_RVC; |
| 3590 | |
| 3591 | BFD_ASSERT (rel->r_offset + 4 <= sec->size); |
| 3592 | |
| 3593 | if (gp) |
| 3594 | { |
| 3595 | /* If gp and the symbol are in the same output section, which is not the |
| 3596 | abs section, then consider only that output section's alignment. */ |
| 3597 | struct bfd_link_hash_entry *h = |
| 3598 | bfd_link_hash_lookup (link_info->hash, RISCV_GP_SYMBOL, FALSE, FALSE, |
| 3599 | TRUE); |
| 3600 | if (h->u.def.section->output_section == sym_sec->output_section |
| 3601 | && sym_sec->output_section != bfd_abs_section_ptr) |
| 3602 | max_alignment = (bfd_vma) 1 << sym_sec->output_section->alignment_power; |
| 3603 | } |
| 3604 | |
| 3605 | /* Is the reference in range of x0 or gp? |
| 3606 | Valid gp range conservatively because of alignment issue. */ |
| 3607 | if (undefined_weak |
| 3608 | || (VALID_ITYPE_IMM (symval) |
| 3609 | || (symval >= gp |
| 3610 | && VALID_ITYPE_IMM (symval - gp + max_alignment + reserve_size)) |
| 3611 | || (symval < gp |
| 3612 | && VALID_ITYPE_IMM (symval - gp - max_alignment - reserve_size)))) |
| 3613 | { |
| 3614 | unsigned sym = ELFNN_R_SYM (rel->r_info); |
| 3615 | switch (ELFNN_R_TYPE (rel->r_info)) |
| 3616 | { |
| 3617 | case R_RISCV_LO12_I: |
| 3618 | if (undefined_weak) |
| 3619 | { |
| 3620 | /* Change the RS1 to zero. */ |
| 3621 | bfd_vma insn = bfd_get_32 (abfd, contents + rel->r_offset); |
| 3622 | insn &= ~(OP_MASK_RS1 << OP_SH_RS1); |
| 3623 | bfd_put_32 (abfd, insn, contents + rel->r_offset); |
| 3624 | } |
| 3625 | else |
| 3626 | rel->r_info = ELFNN_R_INFO (sym, R_RISCV_GPREL_I); |
| 3627 | return TRUE; |
| 3628 | |
| 3629 | case R_RISCV_LO12_S: |
| 3630 | if (undefined_weak) |
| 3631 | { |
| 3632 | /* Change the RS1 to zero. */ |
| 3633 | bfd_vma insn = bfd_get_32 (abfd, contents + rel->r_offset); |
| 3634 | insn &= ~(OP_MASK_RS1 << OP_SH_RS1); |
| 3635 | bfd_put_32 (abfd, insn, contents + rel->r_offset); |
| 3636 | } |
| 3637 | else |
| 3638 | rel->r_info = ELFNN_R_INFO (sym, R_RISCV_GPREL_S); |
| 3639 | return TRUE; |
| 3640 | |
| 3641 | case R_RISCV_HI20: |
| 3642 | /* We can delete the unnecessary LUI and reloc. */ |
| 3643 | rel->r_info = ELFNN_R_INFO (0, R_RISCV_NONE); |
| 3644 | *again = TRUE; |
| 3645 | return riscv_relax_delete_bytes (abfd, sec, rel->r_offset, 4, |
| 3646 | link_info); |
| 3647 | |
| 3648 | default: |
| 3649 | abort (); |
| 3650 | } |
| 3651 | } |
| 3652 | |
| 3653 | /* Can we relax LUI to C.LUI? Alignment might move the section forward; |
| 3654 | account for this assuming page alignment at worst. In the presence of |
| 3655 | RELRO segment the linker aligns it by one page size, therefore sections |
| 3656 | after the segment can be moved more than one page. */ |
| 3657 | |
| 3658 | if (use_rvc |
| 3659 | && ELFNN_R_TYPE (rel->r_info) == R_RISCV_HI20 |
| 3660 | && VALID_RVC_LUI_IMM (RISCV_CONST_HIGH_PART (symval)) |
| 3661 | && VALID_RVC_LUI_IMM (RISCV_CONST_HIGH_PART (symval) |
| 3662 | + (link_info->relro ? 2 * ELF_MAXPAGESIZE |
| 3663 | : ELF_MAXPAGESIZE))) |
| 3664 | { |
| 3665 | /* Replace LUI with C.LUI if legal (i.e., rd != x0 and rd != x2/sp). */ |
| 3666 | bfd_vma lui = bfd_get_32 (abfd, contents + rel->r_offset); |
| 3667 | unsigned rd = ((unsigned)lui >> OP_SH_RD) & OP_MASK_RD; |
| 3668 | if (rd == 0 || rd == X_SP) |
| 3669 | return TRUE; |
| 3670 | |
| 3671 | lui = (lui & (OP_MASK_RD << OP_SH_RD)) | MATCH_C_LUI; |
| 3672 | bfd_put_32 (abfd, lui, contents + rel->r_offset); |
| 3673 | |
| 3674 | /* Replace the R_RISCV_HI20 reloc. */ |
| 3675 | rel->r_info = ELFNN_R_INFO (ELFNN_R_SYM (rel->r_info), R_RISCV_RVC_LUI); |
| 3676 | |
| 3677 | *again = TRUE; |
| 3678 | return riscv_relax_delete_bytes (abfd, sec, rel->r_offset + 2, 2, |
| 3679 | link_info); |
| 3680 | } |
| 3681 | |
| 3682 | return TRUE; |
| 3683 | } |
| 3684 | |
| 3685 | /* Relax non-PIC TLS references. */ |
| 3686 | |
| 3687 | static bfd_boolean |
| 3688 | _bfd_riscv_relax_tls_le (bfd *abfd, |
| 3689 | asection *sec, |
| 3690 | asection *sym_sec ATTRIBUTE_UNUSED, |
| 3691 | struct bfd_link_info *link_info, |
| 3692 | Elf_Internal_Rela *rel, |
| 3693 | bfd_vma symval, |
| 3694 | bfd_vma max_alignment ATTRIBUTE_UNUSED, |
| 3695 | bfd_vma reserve_size ATTRIBUTE_UNUSED, |
| 3696 | bfd_boolean *again, |
| 3697 | riscv_pcgp_relocs *prcel_relocs ATTRIBUTE_UNUSED, |
| 3698 | bfd_boolean undefined_weak ATTRIBUTE_UNUSED) |
| 3699 | { |
| 3700 | /* See if this symbol is in range of tp. */ |
| 3701 | if (RISCV_CONST_HIGH_PART (tpoff (link_info, symval)) != 0) |
| 3702 | return TRUE; |
| 3703 | |
| 3704 | BFD_ASSERT (rel->r_offset + 4 <= sec->size); |
| 3705 | switch (ELFNN_R_TYPE (rel->r_info)) |
| 3706 | { |
| 3707 | case R_RISCV_TPREL_LO12_I: |
| 3708 | rel->r_info = ELFNN_R_INFO (ELFNN_R_SYM (rel->r_info), R_RISCV_TPREL_I); |
| 3709 | return TRUE; |
| 3710 | |
| 3711 | case R_RISCV_TPREL_LO12_S: |
| 3712 | rel->r_info = ELFNN_R_INFO (ELFNN_R_SYM (rel->r_info), R_RISCV_TPREL_S); |
| 3713 | return TRUE; |
| 3714 | |
| 3715 | case R_RISCV_TPREL_HI20: |
| 3716 | case R_RISCV_TPREL_ADD: |
| 3717 | /* We can delete the unnecessary instruction and reloc. */ |
| 3718 | rel->r_info = ELFNN_R_INFO (0, R_RISCV_NONE); |
| 3719 | *again = TRUE; |
| 3720 | return riscv_relax_delete_bytes (abfd, sec, rel->r_offset, 4, link_info); |
| 3721 | |
| 3722 | default: |
| 3723 | abort (); |
| 3724 | } |
| 3725 | } |
| 3726 | |
| 3727 | /* Implement R_RISCV_ALIGN by deleting excess alignment NOPs. */ |
| 3728 | |
| 3729 | static bfd_boolean |
| 3730 | _bfd_riscv_relax_align (bfd *abfd, asection *sec, |
| 3731 | asection *sym_sec, |
| 3732 | struct bfd_link_info *link_info, |
| 3733 | Elf_Internal_Rela *rel, |
| 3734 | bfd_vma symval, |
| 3735 | bfd_vma max_alignment ATTRIBUTE_UNUSED, |
| 3736 | bfd_vma reserve_size ATTRIBUTE_UNUSED, |
| 3737 | bfd_boolean *again ATTRIBUTE_UNUSED, |
| 3738 | riscv_pcgp_relocs *pcrel_relocs ATTRIBUTE_UNUSED, |
| 3739 | bfd_boolean undefined_weak ATTRIBUTE_UNUSED) |
| 3740 | { |
| 3741 | bfd_byte *contents = elf_section_data (sec)->this_hdr.contents; |
| 3742 | bfd_vma alignment = 1, pos; |
| 3743 | while (alignment <= rel->r_addend) |
| 3744 | alignment *= 2; |
| 3745 | |
| 3746 | symval -= rel->r_addend; |
| 3747 | bfd_vma aligned_addr = ((symval - 1) & ~(alignment - 1)) + alignment; |
| 3748 | bfd_vma nop_bytes = aligned_addr - symval; |
| 3749 | |
| 3750 | /* Once we've handled an R_RISCV_ALIGN, we can't relax anything else. */ |
| 3751 | sec->sec_flg0 = TRUE; |
| 3752 | |
| 3753 | /* Make sure there are enough NOPs to actually achieve the alignment. */ |
| 3754 | if (rel->r_addend < nop_bytes) |
| 3755 | { |
| 3756 | _bfd_error_handler |
| 3757 | (_("%pB(%pA+%#" PRIx64 "): %" PRId64 " bytes required for alignment " |
| 3758 | "to %" PRId64 "-byte boundary, but only %" PRId64 " present"), |
| 3759 | abfd, sym_sec, (uint64_t) rel->r_offset, |
| 3760 | (int64_t) nop_bytes, (int64_t) alignment, (int64_t) rel->r_addend); |
| 3761 | bfd_set_error (bfd_error_bad_value); |
| 3762 | return FALSE; |
| 3763 | } |
| 3764 | |
| 3765 | /* Delete the reloc. */ |
| 3766 | rel->r_info = ELFNN_R_INFO (0, R_RISCV_NONE); |
| 3767 | |
| 3768 | /* If the number of NOPs is already correct, there's nothing to do. */ |
| 3769 | if (nop_bytes == rel->r_addend) |
| 3770 | return TRUE; |
| 3771 | |
| 3772 | /* Write as many RISC-V NOPs as we need. */ |
| 3773 | for (pos = 0; pos < (nop_bytes & -4); pos += 4) |
| 3774 | bfd_put_32 (abfd, RISCV_NOP, contents + rel->r_offset + pos); |
| 3775 | |
| 3776 | /* Write a final RVC NOP if need be. */ |
| 3777 | if (nop_bytes % 4 != 0) |
| 3778 | bfd_put_16 (abfd, RVC_NOP, contents + rel->r_offset + pos); |
| 3779 | |
| 3780 | /* Delete the excess bytes. */ |
| 3781 | return riscv_relax_delete_bytes (abfd, sec, rel->r_offset + nop_bytes, |
| 3782 | rel->r_addend - nop_bytes, link_info); |
| 3783 | } |
| 3784 | |
| 3785 | /* Relax PC-relative references to GP-relative references. */ |
| 3786 | |
| 3787 | static bfd_boolean |
| 3788 | _bfd_riscv_relax_pc (bfd *abfd ATTRIBUTE_UNUSED, |
| 3789 | asection *sec, |
| 3790 | asection *sym_sec, |
| 3791 | struct bfd_link_info *link_info, |
| 3792 | Elf_Internal_Rela *rel, |
| 3793 | bfd_vma symval, |
| 3794 | bfd_vma max_alignment, |
| 3795 | bfd_vma reserve_size, |
| 3796 | bfd_boolean *again ATTRIBUTE_UNUSED, |
| 3797 | riscv_pcgp_relocs *pcgp_relocs, |
| 3798 | bfd_boolean undefined_weak) |
| 3799 | { |
| 3800 | bfd_byte *contents = elf_section_data (sec)->this_hdr.contents; |
| 3801 | bfd_vma gp = riscv_global_pointer_value (link_info); |
| 3802 | |
| 3803 | BFD_ASSERT (rel->r_offset + 4 <= sec->size); |
| 3804 | |
| 3805 | /* Chain the _LO relocs to their cooresponding _HI reloc to compute the |
| 3806 | * actual target address. */ |
| 3807 | riscv_pcgp_hi_reloc hi_reloc; |
| 3808 | memset (&hi_reloc, 0, sizeof (hi_reloc)); |
| 3809 | switch (ELFNN_R_TYPE (rel->r_info)) |
| 3810 | { |
| 3811 | case R_RISCV_PCREL_LO12_I: |
| 3812 | case R_RISCV_PCREL_LO12_S: |
| 3813 | { |
| 3814 | /* If the %lo has an addend, it isn't for the label pointing at the |
| 3815 | hi part instruction, but rather for the symbol pointed at by the |
| 3816 | hi part instruction. So we must subtract it here for the lookup. |
| 3817 | It is still used below in the final symbol address. */ |
| 3818 | bfd_vma hi_sec_off = symval - sec_addr (sym_sec) - rel->r_addend; |
| 3819 | riscv_pcgp_hi_reloc *hi = riscv_find_pcgp_hi_reloc (pcgp_relocs, |
| 3820 | hi_sec_off); |
| 3821 | if (hi == NULL) |
| 3822 | { |
| 3823 | riscv_record_pcgp_lo_reloc (pcgp_relocs, hi_sec_off); |
| 3824 | return TRUE; |
| 3825 | } |
| 3826 | |
| 3827 | hi_reloc = *hi; |
| 3828 | symval = hi_reloc.hi_addr; |
| 3829 | sym_sec = hi_reloc.sym_sec; |
| 3830 | |
| 3831 | /* We can not know whether the undefined weak symbol is referenced |
| 3832 | according to the information of R_RISCV_PCREL_LO12_I/S. Therefore, |
| 3833 | we have to record the 'undefined_weak' flag when handling the |
| 3834 | corresponding R_RISCV_HI20 reloc in riscv_record_pcgp_hi_reloc. */ |
| 3835 | undefined_weak = hi_reloc.undefined_weak; |
| 3836 | } |
| 3837 | break; |
| 3838 | |
| 3839 | case R_RISCV_PCREL_HI20: |
| 3840 | /* Mergeable symbols and code might later move out of range. */ |
| 3841 | if (! undefined_weak |
| 3842 | && sym_sec->flags & (SEC_MERGE | SEC_CODE)) |
| 3843 | return TRUE; |
| 3844 | |
| 3845 | /* If the cooresponding lo relocation has already been seen then it's not |
| 3846 | * safe to relax this relocation. */ |
| 3847 | if (riscv_find_pcgp_lo_reloc (pcgp_relocs, rel->r_offset)) |
| 3848 | return TRUE; |
| 3849 | |
| 3850 | break; |
| 3851 | |
| 3852 | default: |
| 3853 | abort (); |
| 3854 | } |
| 3855 | |
| 3856 | if (gp) |
| 3857 | { |
| 3858 | /* If gp and the symbol are in the same output section, which is not the |
| 3859 | abs section, then consider only that output section's alignment. */ |
| 3860 | struct bfd_link_hash_entry *h = |
| 3861 | bfd_link_hash_lookup (link_info->hash, RISCV_GP_SYMBOL, FALSE, FALSE, |
| 3862 | TRUE); |
| 3863 | if (h->u.def.section->output_section == sym_sec->output_section |
| 3864 | && sym_sec->output_section != bfd_abs_section_ptr) |
| 3865 | max_alignment = (bfd_vma) 1 << sym_sec->output_section->alignment_power; |
| 3866 | } |
| 3867 | |
| 3868 | /* Is the reference in range of x0 or gp? |
| 3869 | Valid gp range conservatively because of alignment issue. */ |
| 3870 | if (undefined_weak |
| 3871 | || (VALID_ITYPE_IMM (symval) |
| 3872 | || (symval >= gp |
| 3873 | && VALID_ITYPE_IMM (symval - gp + max_alignment + reserve_size)) |
| 3874 | || (symval < gp |
| 3875 | && VALID_ITYPE_IMM (symval - gp - max_alignment - reserve_size)))) |
| 3876 | { |
| 3877 | unsigned sym = hi_reloc.hi_sym; |
| 3878 | switch (ELFNN_R_TYPE (rel->r_info)) |
| 3879 | { |
| 3880 | case R_RISCV_PCREL_LO12_I: |
| 3881 | if (undefined_weak) |
| 3882 | { |
| 3883 | /* Change the RS1 to zero, and then modify the relocation |
| 3884 | type to R_RISCV_LO12_I. */ |
| 3885 | bfd_vma insn = bfd_get_32 (abfd, contents + rel->r_offset); |
| 3886 | insn &= ~(OP_MASK_RS1 << OP_SH_RS1); |
| 3887 | bfd_put_32 (abfd, insn, contents + rel->r_offset); |
| 3888 | rel->r_info = ELFNN_R_INFO (sym, R_RISCV_LO12_I); |
| 3889 | rel->r_addend = hi_reloc.hi_addend; |
| 3890 | } |
| 3891 | else |
| 3892 | { |
| 3893 | rel->r_info = ELFNN_R_INFO (sym, R_RISCV_GPREL_I); |
| 3894 | rel->r_addend += hi_reloc.hi_addend; |
| 3895 | } |
| 3896 | return TRUE; |
| 3897 | |
| 3898 | case R_RISCV_PCREL_LO12_S: |
| 3899 | if (undefined_weak) |
| 3900 | { |
| 3901 | /* Change the RS1 to zero, and then modify the relocation |
| 3902 | type to R_RISCV_LO12_S. */ |
| 3903 | bfd_vma insn = bfd_get_32 (abfd, contents + rel->r_offset); |
| 3904 | insn &= ~(OP_MASK_RS1 << OP_SH_RS1); |
| 3905 | bfd_put_32 (abfd, insn, contents + rel->r_offset); |
| 3906 | rel->r_info = ELFNN_R_INFO (sym, R_RISCV_LO12_S); |
| 3907 | rel->r_addend = hi_reloc.hi_addend; |
| 3908 | } |
| 3909 | else |
| 3910 | { |
| 3911 | rel->r_info = ELFNN_R_INFO (sym, R_RISCV_GPREL_S); |
| 3912 | rel->r_addend += hi_reloc.hi_addend; |
| 3913 | } |
| 3914 | return TRUE; |
| 3915 | |
| 3916 | case R_RISCV_PCREL_HI20: |
| 3917 | riscv_record_pcgp_hi_reloc (pcgp_relocs, |
| 3918 | rel->r_offset, |
| 3919 | rel->r_addend, |
| 3920 | symval, |
| 3921 | ELFNN_R_SYM(rel->r_info), |
| 3922 | sym_sec, |
| 3923 | undefined_weak); |
| 3924 | /* We can delete the unnecessary AUIPC and reloc. */ |
| 3925 | rel->r_info = ELFNN_R_INFO (0, R_RISCV_DELETE); |
| 3926 | rel->r_addend = 4; |
| 3927 | return TRUE; |
| 3928 | |
| 3929 | default: |
| 3930 | abort (); |
| 3931 | } |
| 3932 | } |
| 3933 | |
| 3934 | return TRUE; |
| 3935 | } |
| 3936 | |
| 3937 | /* Relax PC-relative references to GP-relative references. */ |
| 3938 | |
| 3939 | static bfd_boolean |
| 3940 | _bfd_riscv_relax_delete (bfd *abfd, |
| 3941 | asection *sec, |
| 3942 | asection *sym_sec ATTRIBUTE_UNUSED, |
| 3943 | struct bfd_link_info *link_info, |
| 3944 | Elf_Internal_Rela *rel, |
| 3945 | bfd_vma symval ATTRIBUTE_UNUSED, |
| 3946 | bfd_vma max_alignment ATTRIBUTE_UNUSED, |
| 3947 | bfd_vma reserve_size ATTRIBUTE_UNUSED, |
| 3948 | bfd_boolean *again ATTRIBUTE_UNUSED, |
| 3949 | riscv_pcgp_relocs *pcgp_relocs ATTRIBUTE_UNUSED, |
| 3950 | bfd_boolean undefined_weak ATTRIBUTE_UNUSED) |
| 3951 | { |
| 3952 | if (!riscv_relax_delete_bytes(abfd, sec, rel->r_offset, rel->r_addend, |
| 3953 | link_info)) |
| 3954 | return FALSE; |
| 3955 | rel->r_info = ELFNN_R_INFO(0, R_RISCV_NONE); |
| 3956 | return TRUE; |
| 3957 | } |
| 3958 | |
| 3959 | /* Relax a section. Pass 0 shortens code sequences unless disabled. Pass 1 |
| 3960 | deletes the bytes that pass 0 made obselete. Pass 2, which cannot be |
| 3961 | disabled, handles code alignment directives. */ |
| 3962 | |
| 3963 | static bfd_boolean |
| 3964 | _bfd_riscv_relax_section (bfd *abfd, asection *sec, |
| 3965 | struct bfd_link_info *info, |
| 3966 | bfd_boolean *again) |
| 3967 | { |
| 3968 | Elf_Internal_Shdr *symtab_hdr = &elf_symtab_hdr (abfd); |
| 3969 | struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info); |
| 3970 | struct bfd_elf_section_data *data = elf_section_data (sec); |
| 3971 | Elf_Internal_Rela *relocs; |
| 3972 | bfd_boolean ret = FALSE; |
| 3973 | unsigned int i; |
| 3974 | bfd_vma max_alignment, reserve_size = 0; |
| 3975 | riscv_pcgp_relocs pcgp_relocs; |
| 3976 | |
| 3977 | *again = FALSE; |
| 3978 | |
| 3979 | if (bfd_link_relocatable (info) |
| 3980 | || sec->sec_flg0 |
| 3981 | || (sec->flags & SEC_RELOC) == 0 |
| 3982 | || sec->reloc_count == 0 |
| 3983 | || (info->disable_target_specific_optimizations |
| 3984 | && info->relax_pass == 0)) |
| 3985 | return TRUE; |
| 3986 | |
| 3987 | riscv_init_pcgp_relocs (&pcgp_relocs); |
| 3988 | |
| 3989 | /* Read this BFD's relocs if we haven't done so already. */ |
| 3990 | if (data->relocs) |
| 3991 | relocs = data->relocs; |
| 3992 | else if (!(relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, |
| 3993 | info->keep_memory))) |
| 3994 | goto fail; |
| 3995 | |
| 3996 | if (htab) |
| 3997 | { |
| 3998 | max_alignment = htab->max_alignment; |
| 3999 | if (max_alignment == (bfd_vma) -1) |
| 4000 | { |
| 4001 | max_alignment = _bfd_riscv_get_max_alignment (sec); |
| 4002 | htab->max_alignment = max_alignment; |
| 4003 | } |
| 4004 | } |
| 4005 | else |
| 4006 | max_alignment = _bfd_riscv_get_max_alignment (sec); |
| 4007 | |
| 4008 | /* Examine and consider relaxing each reloc. */ |
| 4009 | for (i = 0; i < sec->reloc_count; i++) |
| 4010 | { |
| 4011 | asection *sym_sec; |
| 4012 | Elf_Internal_Rela *rel = relocs + i; |
| 4013 | relax_func_t relax_func; |
| 4014 | int type = ELFNN_R_TYPE (rel->r_info); |
| 4015 | bfd_vma symval; |
| 4016 | char symtype; |
| 4017 | bfd_boolean undefined_weak = FALSE; |
| 4018 | |
| 4019 | relax_func = NULL; |
| 4020 | if (info->relax_pass == 0) |
| 4021 | { |
| 4022 | if (type == R_RISCV_CALL || type == R_RISCV_CALL_PLT) |
| 4023 | relax_func = _bfd_riscv_relax_call; |
| 4024 | else if (type == R_RISCV_HI20 |
| 4025 | || type == R_RISCV_LO12_I |
| 4026 | || type == R_RISCV_LO12_S) |
| 4027 | relax_func = _bfd_riscv_relax_lui; |
| 4028 | else if (!bfd_link_pic(info) |
| 4029 | && (type == R_RISCV_PCREL_HI20 |
| 4030 | || type == R_RISCV_PCREL_LO12_I |
| 4031 | || type == R_RISCV_PCREL_LO12_S)) |
| 4032 | relax_func = _bfd_riscv_relax_pc; |
| 4033 | else if (type == R_RISCV_TPREL_HI20 |
| 4034 | || type == R_RISCV_TPREL_ADD |
| 4035 | || type == R_RISCV_TPREL_LO12_I |
| 4036 | || type == R_RISCV_TPREL_LO12_S) |
| 4037 | relax_func = _bfd_riscv_relax_tls_le; |
| 4038 | else |
| 4039 | continue; |
| 4040 | |
| 4041 | /* Only relax this reloc if it is paired with R_RISCV_RELAX. */ |
| 4042 | if (i == sec->reloc_count - 1 |
| 4043 | || ELFNN_R_TYPE ((rel + 1)->r_info) != R_RISCV_RELAX |
| 4044 | || rel->r_offset != (rel + 1)->r_offset) |
| 4045 | continue; |
| 4046 | |
| 4047 | /* Skip over the R_RISCV_RELAX. */ |
| 4048 | i++; |
| 4049 | } |
| 4050 | else if (info->relax_pass == 1 && type == R_RISCV_DELETE) |
| 4051 | relax_func = _bfd_riscv_relax_delete; |
| 4052 | else if (info->relax_pass == 2 && type == R_RISCV_ALIGN) |
| 4053 | relax_func = _bfd_riscv_relax_align; |
| 4054 | else |
| 4055 | continue; |
| 4056 | |
| 4057 | data->relocs = relocs; |
| 4058 | |
| 4059 | /* Read this BFD's contents if we haven't done so already. */ |
| 4060 | if (!data->this_hdr.contents |
| 4061 | && !bfd_malloc_and_get_section (abfd, sec, &data->this_hdr.contents)) |
| 4062 | goto fail; |
| 4063 | |
| 4064 | /* Read this BFD's symbols if we haven't done so already. */ |
| 4065 | if (symtab_hdr->sh_info != 0 |
| 4066 | && !symtab_hdr->contents |
| 4067 | && !(symtab_hdr->contents = |
| 4068 | (unsigned char *) bfd_elf_get_elf_syms (abfd, symtab_hdr, |
| 4069 | symtab_hdr->sh_info, |
| 4070 | 0, NULL, NULL, NULL))) |
| 4071 | goto fail; |
| 4072 | |
| 4073 | /* Get the value of the symbol referred to by the reloc. */ |
| 4074 | if (ELFNN_R_SYM (rel->r_info) < symtab_hdr->sh_info) |
| 4075 | { |
| 4076 | /* A local symbol. */ |
| 4077 | Elf_Internal_Sym *isym = ((Elf_Internal_Sym *) symtab_hdr->contents |
| 4078 | + ELFNN_R_SYM (rel->r_info)); |
| 4079 | reserve_size = (isym->st_size - rel->r_addend) > isym->st_size |
| 4080 | ? 0 : isym->st_size - rel->r_addend; |
| 4081 | |
| 4082 | if (isym->st_shndx == SHN_UNDEF) |
| 4083 | sym_sec = sec, symval = rel->r_offset; |
| 4084 | else |
| 4085 | { |
| 4086 | BFD_ASSERT (isym->st_shndx < elf_numsections (abfd)); |
| 4087 | sym_sec = elf_elfsections (abfd)[isym->st_shndx]->bfd_section; |
| 4088 | #if 0 |
| 4089 | /* The purpose of this code is unknown. It breaks linker scripts |
| 4090 | for embedded development that place sections at address zero. |
| 4091 | This code is believed to be unnecessary. Disabling it but not |
| 4092 | yet removing it, in case something breaks. */ |
| 4093 | if (sec_addr (sym_sec) == 0) |
| 4094 | continue; |
| 4095 | #endif |
| 4096 | symval = isym->st_value; |
| 4097 | } |
| 4098 | symtype = ELF_ST_TYPE (isym->st_info); |
| 4099 | } |
| 4100 | else |
| 4101 | { |
| 4102 | unsigned long indx; |
| 4103 | struct elf_link_hash_entry *h; |
| 4104 | |
| 4105 | indx = ELFNN_R_SYM (rel->r_info) - symtab_hdr->sh_info; |
| 4106 | h = elf_sym_hashes (abfd)[indx]; |
| 4107 | |
| 4108 | while (h->root.type == bfd_link_hash_indirect |
| 4109 | || h->root.type == bfd_link_hash_warning) |
| 4110 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 4111 | |
| 4112 | if (h->root.type == bfd_link_hash_undefweak |
| 4113 | && (relax_func == _bfd_riscv_relax_lui |
| 4114 | || relax_func == _bfd_riscv_relax_pc)) |
| 4115 | { |
| 4116 | /* For the lui and auipc relaxations, since the symbol |
| 4117 | value of an undefined weak symbol is always be zero, |
| 4118 | we can optimize the patterns into a single LI/MV/ADDI |
| 4119 | instruction. |
| 4120 | |
| 4121 | Note that, creating shared libraries and pie output may |
| 4122 | break the rule above. Fortunately, since we do not relax |
| 4123 | pc relocs when creating shared libraries and pie output, |
| 4124 | and the absolute address access for R_RISCV_HI20 isn't |
| 4125 | allowed when "-fPIC" is set, the problem of creating shared |
| 4126 | libraries can not happen currently. Once we support the |
| 4127 | auipc relaxations when creating shared libraries, then we will |
| 4128 | need the more rigorous checking for this optimization. */ |
| 4129 | undefined_weak = TRUE; |
| 4130 | } |
| 4131 | |
| 4132 | /* This line has to match the check in riscv_elf_relocate_section |
| 4133 | in the R_RISCV_CALL[_PLT] case. */ |
| 4134 | if (bfd_link_pic (info) && h->plt.offset != MINUS_ONE) |
| 4135 | { |
| 4136 | sym_sec = htab->elf.splt; |
| 4137 | symval = h->plt.offset; |
| 4138 | } |
| 4139 | else if (undefined_weak) |
| 4140 | { |
| 4141 | symval = 0; |
| 4142 | sym_sec = bfd_und_section_ptr; |
| 4143 | } |
| 4144 | else if (h->root.u.def.section->output_section == NULL |
| 4145 | || (h->root.type != bfd_link_hash_defined |
| 4146 | && h->root.type != bfd_link_hash_defweak)) |
| 4147 | continue; |
| 4148 | else |
| 4149 | { |
| 4150 | symval = h->root.u.def.value; |
| 4151 | sym_sec = h->root.u.def.section; |
| 4152 | } |
| 4153 | |
| 4154 | if (h->type != STT_FUNC) |
| 4155 | reserve_size = |
| 4156 | (h->size - rel->r_addend) > h->size ? 0 : h->size - rel->r_addend; |
| 4157 | symtype = h->type; |
| 4158 | } |
| 4159 | |
| 4160 | if (sym_sec->sec_info_type == SEC_INFO_TYPE_MERGE |
| 4161 | && (sym_sec->flags & SEC_MERGE)) |
| 4162 | { |
| 4163 | /* At this stage in linking, no SEC_MERGE symbol has been |
| 4164 | adjusted, so all references to such symbols need to be |
| 4165 | passed through _bfd_merged_section_offset. (Later, in |
| 4166 | relocate_section, all SEC_MERGE symbols *except* for |
| 4167 | section symbols have been adjusted.) |
| 4168 | |
| 4169 | gas may reduce relocations against symbols in SEC_MERGE |
| 4170 | sections to a relocation against the section symbol when |
| 4171 | the original addend was zero. When the reloc is against |
| 4172 | a section symbol we should include the addend in the |
| 4173 | offset passed to _bfd_merged_section_offset, since the |
| 4174 | location of interest is the original symbol. On the |
| 4175 | other hand, an access to "sym+addend" where "sym" is not |
| 4176 | a section symbol should not include the addend; Such an |
| 4177 | access is presumed to be an offset from "sym"; The |
| 4178 | location of interest is just "sym". */ |
| 4179 | if (symtype == STT_SECTION) |
| 4180 | symval += rel->r_addend; |
| 4181 | |
| 4182 | symval = _bfd_merged_section_offset (abfd, &sym_sec, |
| 4183 | elf_section_data (sym_sec)->sec_info, |
| 4184 | symval); |
| 4185 | |
| 4186 | if (symtype != STT_SECTION) |
| 4187 | symval += rel->r_addend; |
| 4188 | } |
| 4189 | else |
| 4190 | symval += rel->r_addend; |
| 4191 | |
| 4192 | symval += sec_addr (sym_sec); |
| 4193 | |
| 4194 | if (!relax_func (abfd, sec, sym_sec, info, rel, symval, |
| 4195 | max_alignment, reserve_size, again, |
| 4196 | &pcgp_relocs, undefined_weak)) |
| 4197 | goto fail; |
| 4198 | } |
| 4199 | |
| 4200 | ret = TRUE; |
| 4201 | |
| 4202 | fail: |
| 4203 | if (relocs != data->relocs) |
| 4204 | free (relocs); |
| 4205 | riscv_free_pcgp_relocs(&pcgp_relocs, abfd, sec); |
| 4206 | |
| 4207 | return ret; |
| 4208 | } |
| 4209 | |
| 4210 | #if ARCH_SIZE == 32 |
| 4211 | # define PRSTATUS_SIZE 204 |
| 4212 | # define PRSTATUS_OFFSET_PR_CURSIG 12 |
| 4213 | # define PRSTATUS_OFFSET_PR_PID 24 |
| 4214 | # define PRSTATUS_OFFSET_PR_REG 72 |
| 4215 | # define ELF_GREGSET_T_SIZE 128 |
| 4216 | # define PRPSINFO_SIZE 128 |
| 4217 | # define PRPSINFO_OFFSET_PR_PID 16 |
| 4218 | # define PRPSINFO_OFFSET_PR_FNAME 32 |
| 4219 | # define PRPSINFO_OFFSET_PR_PSARGS 48 |
| 4220 | #else |
| 4221 | # define PRSTATUS_SIZE 376 |
| 4222 | # define PRSTATUS_OFFSET_PR_CURSIG 12 |
| 4223 | # define PRSTATUS_OFFSET_PR_PID 32 |
| 4224 | # define PRSTATUS_OFFSET_PR_REG 112 |
| 4225 | # define ELF_GREGSET_T_SIZE 256 |
| 4226 | # define PRPSINFO_SIZE 136 |
| 4227 | # define PRPSINFO_OFFSET_PR_PID 24 |
| 4228 | # define PRPSINFO_OFFSET_PR_FNAME 40 |
| 4229 | # define PRPSINFO_OFFSET_PR_PSARGS 56 |
| 4230 | #endif |
| 4231 | |
| 4232 | /* Support for core dump NOTE sections. */ |
| 4233 | |
| 4234 | static bfd_boolean |
| 4235 | riscv_elf_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) |
| 4236 | { |
| 4237 | switch (note->descsz) |
| 4238 | { |
| 4239 | default: |
| 4240 | return FALSE; |
| 4241 | |
| 4242 | case PRSTATUS_SIZE: /* sizeof(struct elf_prstatus) on Linux/RISC-V. */ |
| 4243 | /* pr_cursig */ |
| 4244 | elf_tdata (abfd)->core->signal |
| 4245 | = bfd_get_16 (abfd, note->descdata + PRSTATUS_OFFSET_PR_CURSIG); |
| 4246 | |
| 4247 | /* pr_pid */ |
| 4248 | elf_tdata (abfd)->core->lwpid |
| 4249 | = bfd_get_32 (abfd, note->descdata + PRSTATUS_OFFSET_PR_PID); |
| 4250 | break; |
| 4251 | } |
| 4252 | |
| 4253 | /* Make a ".reg/999" section. */ |
| 4254 | return _bfd_elfcore_make_pseudosection (abfd, ".reg", ELF_GREGSET_T_SIZE, |
| 4255 | note->descpos + PRSTATUS_OFFSET_PR_REG); |
| 4256 | } |
| 4257 | |
| 4258 | static bfd_boolean |
| 4259 | riscv_elf_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) |
| 4260 | { |
| 4261 | switch (note->descsz) |
| 4262 | { |
| 4263 | default: |
| 4264 | return FALSE; |
| 4265 | |
| 4266 | case PRPSINFO_SIZE: /* sizeof(struct elf_prpsinfo) on Linux/RISC-V. */ |
| 4267 | /* pr_pid */ |
| 4268 | elf_tdata (abfd)->core->pid |
| 4269 | = bfd_get_32 (abfd, note->descdata + PRPSINFO_OFFSET_PR_PID); |
| 4270 | |
| 4271 | /* pr_fname */ |
| 4272 | elf_tdata (abfd)->core->program = _bfd_elfcore_strndup |
| 4273 | (abfd, note->descdata + PRPSINFO_OFFSET_PR_FNAME, 16); |
| 4274 | |
| 4275 | /* pr_psargs */ |
| 4276 | elf_tdata (abfd)->core->command = _bfd_elfcore_strndup |
| 4277 | (abfd, note->descdata + PRPSINFO_OFFSET_PR_PSARGS, 80); |
| 4278 | break; |
| 4279 | } |
| 4280 | |
| 4281 | /* Note that for some reason, a spurious space is tacked |
| 4282 | onto the end of the args in some (at least one anyway) |
| 4283 | implementations, so strip it off if it exists. */ |
| 4284 | |
| 4285 | { |
| 4286 | char *command = elf_tdata (abfd)->core->command; |
| 4287 | int n = strlen (command); |
| 4288 | |
| 4289 | if (0 < n && command[n - 1] == ' ') |
| 4290 | command[n - 1] = '\0'; |
| 4291 | } |
| 4292 | |
| 4293 | return TRUE; |
| 4294 | } |
| 4295 | |
| 4296 | /* Set the right mach type. */ |
| 4297 | static bfd_boolean |
| 4298 | riscv_elf_object_p (bfd *abfd) |
| 4299 | { |
| 4300 | /* There are only two mach types in RISCV currently. */ |
| 4301 | if (strcmp (abfd->xvec->name, "elf32-littleriscv") == 0) |
| 4302 | bfd_default_set_arch_mach (abfd, bfd_arch_riscv, bfd_mach_riscv32); |
| 4303 | else |
| 4304 | bfd_default_set_arch_mach (abfd, bfd_arch_riscv, bfd_mach_riscv64); |
| 4305 | |
| 4306 | return TRUE; |
| 4307 | } |
| 4308 | |
| 4309 | /* Determine whether an object attribute tag takes an integer, a |
| 4310 | string or both. */ |
| 4311 | |
| 4312 | static int |
| 4313 | riscv_elf_obj_attrs_arg_type (int tag) |
| 4314 | { |
| 4315 | return (tag & 1) != 0 ? ATTR_TYPE_FLAG_STR_VAL : ATTR_TYPE_FLAG_INT_VAL; |
| 4316 | } |
| 4317 | |
| 4318 | #define TARGET_LITTLE_SYM riscv_elfNN_vec |
| 4319 | #define TARGET_LITTLE_NAME "elfNN-littleriscv" |
| 4320 | |
| 4321 | #define elf_backend_reloc_type_class riscv_reloc_type_class |
| 4322 | |
| 4323 | #define bfd_elfNN_bfd_reloc_name_lookup riscv_reloc_name_lookup |
| 4324 | #define bfd_elfNN_bfd_link_hash_table_create riscv_elf_link_hash_table_create |
| 4325 | #define bfd_elfNN_bfd_reloc_type_lookup riscv_reloc_type_lookup |
| 4326 | #define bfd_elfNN_bfd_merge_private_bfd_data \ |
| 4327 | _bfd_riscv_elf_merge_private_bfd_data |
| 4328 | |
| 4329 | #define elf_backend_copy_indirect_symbol riscv_elf_copy_indirect_symbol |
| 4330 | #define elf_backend_create_dynamic_sections riscv_elf_create_dynamic_sections |
| 4331 | #define elf_backend_check_relocs riscv_elf_check_relocs |
| 4332 | #define elf_backend_adjust_dynamic_symbol riscv_elf_adjust_dynamic_symbol |
| 4333 | #define elf_backend_size_dynamic_sections riscv_elf_size_dynamic_sections |
| 4334 | #define elf_backend_relocate_section riscv_elf_relocate_section |
| 4335 | #define elf_backend_finish_dynamic_symbol riscv_elf_finish_dynamic_symbol |
| 4336 | #define elf_backend_finish_dynamic_sections riscv_elf_finish_dynamic_sections |
| 4337 | #define elf_backend_gc_mark_hook riscv_elf_gc_mark_hook |
| 4338 | #define elf_backend_plt_sym_val riscv_elf_plt_sym_val |
| 4339 | #define elf_backend_grok_prstatus riscv_elf_grok_prstatus |
| 4340 | #define elf_backend_grok_psinfo riscv_elf_grok_psinfo |
| 4341 | #define elf_backend_object_p riscv_elf_object_p |
| 4342 | #define elf_info_to_howto_rel NULL |
| 4343 | #define elf_info_to_howto riscv_info_to_howto_rela |
| 4344 | #define bfd_elfNN_bfd_relax_section _bfd_riscv_relax_section |
| 4345 | |
| 4346 | #define elf_backend_init_index_section _bfd_elf_init_1_index_section |
| 4347 | |
| 4348 | #define elf_backend_can_gc_sections 1 |
| 4349 | #define elf_backend_can_refcount 1 |
| 4350 | #define elf_backend_want_got_plt 1 |
| 4351 | #define elf_backend_plt_readonly 1 |
| 4352 | #define elf_backend_plt_alignment 4 |
| 4353 | #define elf_backend_want_plt_sym 1 |
| 4354 | #define elf_backend_got_header_size (ARCH_SIZE / 8) |
| 4355 | #define elf_backend_want_dynrelro 1 |
| 4356 | #define elf_backend_rela_normal 1 |
| 4357 | #define elf_backend_default_execstack 0 |
| 4358 | |
| 4359 | #undef elf_backend_obj_attrs_vendor |
| 4360 | #define elf_backend_obj_attrs_vendor "riscv" |
| 4361 | #undef elf_backend_obj_attrs_arg_type |
| 4362 | #define elf_backend_obj_attrs_arg_type riscv_elf_obj_attrs_arg_type |
| 4363 | #undef elf_backend_obj_attrs_section_type |
| 4364 | #define elf_backend_obj_attrs_section_type SHT_RISCV_ATTRIBUTES |
| 4365 | #undef elf_backend_obj_attrs_section |
| 4366 | #define elf_backend_obj_attrs_section ".riscv.attributes" |
| 4367 | |
| 4368 | #include "elfNN-target.h" |