1 /* RISC-V-specific support for NN-bit ELF.
2 Copyright (C) 2011-2019 Free Software Foundation, Inc.
4 Contributed by Andrew Waterman (andrew@sifive.com).
5 Based on TILE-Gx and MIPS targets.
7 This file is part of BFD, the Binary File Descriptor library.
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.
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.
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/>. */
23 /* This file handles RISC-V ELF targets. */
31 #include "elfxx-riscv.h"
32 #include "elf/riscv.h"
33 #include "opcode/riscv.h"
35 /* Internal relocations used exclusively by the relaxation pass. */
36 #define R_RISCV_DELETE (R_RISCV_max + 1)
40 #define MINUS_ONE ((bfd_vma)0 - 1)
42 #define RISCV_ELF_LOG_WORD_BYTES (ARCH_SIZE == 32 ? 2 : 3)
44 #define RISCV_ELF_WORD_BYTES (1 << RISCV_ELF_LOG_WORD_BYTES)
46 /* The name of the dynamic interpreter. This is put in the .interp
49 #define ELF64_DYNAMIC_INTERPRETER "/lib/ld.so.1"
50 #define ELF32_DYNAMIC_INTERPRETER "/lib32/ld.so.1"
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
58 /* RISC-V ELF linker hash entry. */
60 struct riscv_elf_link_hash_entry
62 struct elf_link_hash_entry elf;
64 /* Track dynamic relocs copied for this symbol. */
65 struct elf_dyn_relocs *dyn_relocs;
75 #define riscv_elf_hash_entry(ent) \
76 ((struct riscv_elf_link_hash_entry *)(ent))
78 struct _bfd_riscv_elf_obj_tdata
80 struct elf_obj_tdata root;
82 /* tls_type for each local got entry. */
83 char *local_got_tls_type;
86 #define _bfd_riscv_elf_tdata(abfd) \
87 ((struct _bfd_riscv_elf_obj_tdata *) (abfd)->tdata.any)
89 #define _bfd_riscv_elf_local_got_tls_type(abfd) \
90 (_bfd_riscv_elf_tdata (abfd)->local_got_tls_type)
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]))
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)
101 #include "elf/common.h"
102 #include "elf/internal.h"
104 struct riscv_elf_link_hash_table
106 struct elf_link_hash_table elf;
108 /* Short-cuts to get to dynamic linker sections. */
111 /* Small local sym to section mapping cache. */
112 struct sym_cache sym_cache;
114 /* The max alignment of output sections. */
115 bfd_vma max_alignment;
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)
125 riscv_info_to_howto_rela (bfd *abfd,
127 Elf_Internal_Rela *dst)
129 cache_ptr->howto = riscv_elf_rtype_to_howto (abfd, ELFNN_R_TYPE (dst->r_info));
130 return cache_ptr->howto != NULL;
134 riscv_elf_append_rela (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
136 const struct elf_backend_data *bed;
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);
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)
151 #define GOT_ENTRY_SIZE RISCV_ELF_WORD_BYTES
153 #define GOTPLT_HEADER_SIZE (2 * GOT_ENTRY_SIZE)
155 #define sec_addr(sec) ((sec)->output_section->vma + (sec)->output_offset)
158 riscv_elf_got_plt_val (bfd_vma plt_index, struct bfd_link_info *info)
160 return sec_addr (riscv_elf_hash_table (info)->elf.sgotplt)
161 + GOTPLT_HEADER_SIZE + (plt_index * GOT_ENTRY_SIZE);
165 # define MATCH_LREG MATCH_LW
167 # define MATCH_LREG MATCH_LD
170 /* Generate a PLT header. */
173 riscv_make_plt_header (bfd *output_bfd, bfd_vma gotplt_addr, bfd_vma addr,
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);
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)
182 _bfd_error_handler (_("%pB: warning: RVE PLT generation not supported"),
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
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);
208 /* Generate a PLT entry. */
211 riscv_make_plt_entry (bfd *output_bfd, bfd_vma got, bfd_vma addr,
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)
217 _bfd_error_handler (_("%pB: warning: RVE PLT generation not supported"),
222 /* auipc t3, %hi(.got.plt entry)
223 l[w|d] t3, %lo(.got.plt entry)(t3)
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;
235 /* Create an entry in an RISC-V ELF linker hash table. */
237 static struct bfd_hash_entry *
238 link_hash_newfunc (struct bfd_hash_entry *entry,
239 struct bfd_hash_table *table, const char *string)
241 /* Allocate the structure if it has not already been allocated by a
246 bfd_hash_allocate (table,
247 sizeof (struct riscv_elf_link_hash_entry));
252 /* Call the allocation method of the superclass. */
253 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
256 struct riscv_elf_link_hash_entry *eh;
258 eh = (struct riscv_elf_link_hash_entry *) entry;
259 eh->dyn_relocs = NULL;
260 eh->tls_type = GOT_UNKNOWN;
266 /* Create a RISC-V ELF linker hash table. */
268 static struct bfd_link_hash_table *
269 riscv_elf_link_hash_table_create (bfd *abfd)
271 struct riscv_elf_link_hash_table *ret;
272 bfd_size_type amt = sizeof (struct riscv_elf_link_hash_table);
274 ret = (struct riscv_elf_link_hash_table *) bfd_zmalloc (amt);
278 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc,
279 sizeof (struct riscv_elf_link_hash_entry),
286 ret->max_alignment = (bfd_vma) -1;
287 return &ret->elf.root;
290 /* Create the .got section. */
293 riscv_elf_create_got_section (bfd *abfd, struct bfd_link_info *info)
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);
301 /* This function may be called more than once. */
302 if (htab->sgot != NULL)
305 flags = bed->dynamic_sec_flags;
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
313 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
317 s = s_got = bfd_make_section_anyway_with_flags (abfd, ".got", flags);
319 || !bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
323 /* The first bit of the global offset table is the header. */
324 s->size += bed->got_header_size;
326 if (bed->want_got_plt)
328 s = bfd_make_section_anyway_with_flags (abfd, ".got.plt", flags);
330 || !bfd_set_section_alignment (abfd, s,
331 bed->s->log_file_align))
335 /* Reserve room for the header. */
336 s->size += GOTPLT_HEADER_SIZE;
339 if (bed->want_got_sym)
341 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
342 section. We don't do this in the linker script because we don't want
343 to define the symbol if we are not creating a global offset
345 h = _bfd_elf_define_linkage_sym (abfd, info, s_got,
346 "_GLOBAL_OFFSET_TABLE_");
347 elf_hash_table (info)->hgot = h;
355 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
356 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
360 riscv_elf_create_dynamic_sections (bfd *dynobj,
361 struct bfd_link_info *info)
363 struct riscv_elf_link_hash_table *htab;
365 htab = riscv_elf_hash_table (info);
366 BFD_ASSERT (htab != NULL);
368 if (!riscv_elf_create_got_section (dynobj, info))
371 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
374 if (!bfd_link_pic (info))
377 bfd_make_section_anyway_with_flags (dynobj, ".tdata.dyn",
378 (SEC_ALLOC | SEC_THREAD_LOCAL
379 | SEC_LINKER_CREATED));
382 if (!htab->elf.splt || !htab->elf.srelplt || !htab->elf.sdynbss
383 || (!bfd_link_pic (info) && (!htab->elf.srelbss || !htab->sdyntdata)))
389 /* Copy the extra info we tack onto an elf_link_hash_entry. */
392 riscv_elf_copy_indirect_symbol (struct bfd_link_info *info,
393 struct elf_link_hash_entry *dir,
394 struct elf_link_hash_entry *ind)
396 struct riscv_elf_link_hash_entry *edir, *eind;
398 edir = (struct riscv_elf_link_hash_entry *) dir;
399 eind = (struct riscv_elf_link_hash_entry *) ind;
401 if (eind->dyn_relocs != NULL)
403 if (edir->dyn_relocs != NULL)
405 struct elf_dyn_relocs **pp;
406 struct elf_dyn_relocs *p;
408 /* Add reloc counts against the indirect sym to the direct sym
409 list. Merge any entries against the same section. */
410 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
412 struct elf_dyn_relocs *q;
414 for (q = edir->dyn_relocs; q != NULL; q = q->next)
415 if (q->sec == p->sec)
417 q->pc_count += p->pc_count;
418 q->count += p->count;
425 *pp = edir->dyn_relocs;
428 edir->dyn_relocs = eind->dyn_relocs;
429 eind->dyn_relocs = NULL;
432 if (ind->root.type == bfd_link_hash_indirect
433 && dir->got.refcount <= 0)
435 edir->tls_type = eind->tls_type;
436 eind->tls_type = GOT_UNKNOWN;
438 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
442 riscv_elf_record_tls_type (bfd *abfd, struct elf_link_hash_entry *h,
443 unsigned long symndx, char tls_type)
445 char *new_tls_type = &_bfd_riscv_elf_tls_type (abfd, h, symndx);
447 *new_tls_type |= tls_type;
448 if ((*new_tls_type & GOT_NORMAL) && (*new_tls_type & ~GOT_NORMAL))
450 (*_bfd_error_handler)
451 (_("%pB: `%s' accessed both as normal and thread local symbol"),
452 abfd, h ? h->root.root.string : "<local>");
459 riscv_elf_record_got_reference (bfd *abfd, struct bfd_link_info *info,
460 struct elf_link_hash_entry *h, long symndx)
462 struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info);
463 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
465 if (htab->elf.sgot == NULL)
467 if (!riscv_elf_create_got_section (htab->elf.dynobj, info))
473 h->got.refcount += 1;
477 /* This is a global offset table entry for a local symbol. */
478 if (elf_local_got_refcounts (abfd) == NULL)
480 bfd_size_type size = symtab_hdr->sh_info * (sizeof (bfd_vma) + 1);
481 if (!(elf_local_got_refcounts (abfd) = bfd_zalloc (abfd, size)))
483 _bfd_riscv_elf_local_got_tls_type (abfd)
484 = (char *) (elf_local_got_refcounts (abfd) + symtab_hdr->sh_info);
486 elf_local_got_refcounts (abfd) [symndx] += 1;
492 bad_static_reloc (bfd *abfd, unsigned r_type, struct elf_link_hash_entry *h)
494 reloc_howto_type * r = riscv_elf_rtype_to_howto (abfd, r_type);
496 (*_bfd_error_handler)
497 (_("%pB: relocation %s against `%s' can not be used when making a shared "
498 "object; recompile with -fPIC"),
499 abfd, r ? r->name : _("<unknown>"),
500 h != NULL ? h->root.root.string : "a local symbol");
501 bfd_set_error (bfd_error_bad_value);
504 /* Look through the relocs for a section during the first phase, and
505 allocate space in the global offset table or procedure linkage
509 riscv_elf_check_relocs (bfd *abfd, struct bfd_link_info *info,
510 asection *sec, const Elf_Internal_Rela *relocs)
512 struct riscv_elf_link_hash_table *htab;
513 Elf_Internal_Shdr *symtab_hdr;
514 struct elf_link_hash_entry **sym_hashes;
515 const Elf_Internal_Rela *rel;
516 asection *sreloc = NULL;
518 if (bfd_link_relocatable (info))
521 htab = riscv_elf_hash_table (info);
522 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
523 sym_hashes = elf_sym_hashes (abfd);
525 if (htab->elf.dynobj == NULL)
526 htab->elf.dynobj = abfd;
528 for (rel = relocs; rel < relocs + sec->reloc_count; rel++)
531 unsigned int r_symndx;
532 struct elf_link_hash_entry *h;
534 r_symndx = ELFNN_R_SYM (rel->r_info);
535 r_type = ELFNN_R_TYPE (rel->r_info);
537 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
539 (*_bfd_error_handler) (_("%pB: bad symbol index: %d"),
544 if (r_symndx < symtab_hdr->sh_info)
548 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
549 while (h->root.type == bfd_link_hash_indirect
550 || h->root.type == bfd_link_hash_warning)
551 h = (struct elf_link_hash_entry *) h->root.u.i.link;
556 case R_RISCV_TLS_GD_HI20:
557 if (!riscv_elf_record_got_reference (abfd, info, h, r_symndx)
558 || !riscv_elf_record_tls_type (abfd, h, r_symndx, GOT_TLS_GD))
562 case R_RISCV_TLS_GOT_HI20:
563 if (bfd_link_pic (info))
564 info->flags |= DF_STATIC_TLS;
565 if (!riscv_elf_record_got_reference (abfd, info, h, r_symndx)
566 || !riscv_elf_record_tls_type (abfd, h, r_symndx, GOT_TLS_IE))
570 case R_RISCV_GOT_HI20:
571 if (!riscv_elf_record_got_reference (abfd, info, h, r_symndx)
572 || !riscv_elf_record_tls_type (abfd, h, r_symndx, GOT_NORMAL))
576 case R_RISCV_CALL_PLT:
577 /* This symbol requires a procedure linkage table entry. We
578 actually build the entry in adjust_dynamic_symbol,
579 because this might be a case of linking PIC code without
580 linking in any dynamic objects, in which case we don't
581 need to generate a procedure linkage table after all. */
586 h->plt.refcount += 1;
593 case R_RISCV_RVC_BRANCH:
594 case R_RISCV_RVC_JUMP:
595 case R_RISCV_PCREL_HI20:
596 /* In shared libraries, these relocs are known to bind locally. */
597 if (bfd_link_pic (info))
601 case R_RISCV_TPREL_HI20:
602 if (!bfd_link_executable (info))
603 return bad_static_reloc (abfd, r_type, h);
605 riscv_elf_record_tls_type (abfd, h, r_symndx, GOT_TLS_LE);
609 if (bfd_link_pic (info))
610 return bad_static_reloc (abfd, r_type, h);
614 case R_RISCV_JUMP_SLOT:
615 case R_RISCV_RELATIVE:
621 /* This reloc might not bind locally. */
625 if (h != NULL && !bfd_link_pic (info))
627 /* We may need a .plt entry if the function this reloc
628 refers to is in a shared lib. */
629 h->plt.refcount += 1;
632 /* If we are creating a shared library, and this is a reloc
633 against a global symbol, or a non PC relative reloc
634 against a local symbol, then we need to copy the reloc
635 into the shared library. However, if we are linking with
636 -Bsymbolic, we do not need to copy a reloc against a
637 global symbol which is defined in an object we are
638 including in the link (i.e., DEF_REGULAR is set). At
639 this point we have not seen all the input files, so it is
640 possible that DEF_REGULAR is not set now but will be set
641 later (it is never cleared). In case of a weak definition,
642 DEF_REGULAR may be cleared later by a strong definition in
643 a shared library. We account for that possibility below by
644 storing information in the relocs_copied field of the hash
645 table entry. A similar situation occurs when creating
646 shared libraries and symbol visibility changes render the
649 If on the other hand, we are creating an executable, we
650 may need to keep relocations for symbols satisfied by a
651 dynamic library if we manage to avoid copy relocs for the
653 reloc_howto_type * r = riscv_elf_rtype_to_howto (abfd, r_type);
655 if ((bfd_link_pic (info)
656 && (sec->flags & SEC_ALLOC) != 0
657 && ((r != NULL && ! r->pc_relative)
660 || h->root.type == bfd_link_hash_defweak
661 || !h->def_regular))))
662 || (!bfd_link_pic (info)
663 && (sec->flags & SEC_ALLOC) != 0
665 && (h->root.type == bfd_link_hash_defweak
666 || !h->def_regular)))
668 struct elf_dyn_relocs *p;
669 struct elf_dyn_relocs **head;
671 /* When creating a shared object, we must copy these
672 relocs into the output file. We create a reloc
673 section in dynobj and make room for the reloc. */
676 sreloc = _bfd_elf_make_dynamic_reloc_section
677 (sec, htab->elf.dynobj, RISCV_ELF_LOG_WORD_BYTES,
678 abfd, /*rela?*/ TRUE);
684 /* If this is a global symbol, we count the number of
685 relocations we need for this symbol. */
687 head = &((struct riscv_elf_link_hash_entry *) h)->dyn_relocs;
690 /* Track dynamic relocs needed for local syms too.
691 We really need local syms available to do this
696 Elf_Internal_Sym *isym;
698 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
703 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
707 vpp = &elf_section_data (s)->local_dynrel;
708 head = (struct elf_dyn_relocs **) vpp;
712 if (p == NULL || p->sec != sec)
714 bfd_size_type amt = sizeof *p;
715 p = ((struct elf_dyn_relocs *)
716 bfd_alloc (htab->elf.dynobj, amt));
727 p->pc_count += r == NULL ? 0 : r->pc_relative;
732 case R_RISCV_GNU_VTINHERIT:
733 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
737 case R_RISCV_GNU_VTENTRY:
738 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
751 riscv_elf_gc_mark_hook (asection *sec,
752 struct bfd_link_info *info,
753 Elf_Internal_Rela *rel,
754 struct elf_link_hash_entry *h,
755 Elf_Internal_Sym *sym)
758 switch (ELFNN_R_TYPE (rel->r_info))
760 case R_RISCV_GNU_VTINHERIT:
761 case R_RISCV_GNU_VTENTRY:
765 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
768 /* Find dynamic relocs for H that apply to read-only sections. */
771 readonly_dynrelocs (struct elf_link_hash_entry *h)
773 struct elf_dyn_relocs *p;
775 for (p = riscv_elf_hash_entry (h)->dyn_relocs; p != NULL; p = p->next)
777 asection *s = p->sec->output_section;
779 if (s != NULL && (s->flags & SEC_READONLY) != 0)
785 /* Adjust a symbol defined by a dynamic object and referenced by a
786 regular object. The current definition is in some section of the
787 dynamic object, but we're not including those sections. We have to
788 change the definition to something the rest of the link can
792 riscv_elf_adjust_dynamic_symbol (struct bfd_link_info *info,
793 struct elf_link_hash_entry *h)
795 struct riscv_elf_link_hash_table *htab;
796 struct riscv_elf_link_hash_entry * eh;
800 htab = riscv_elf_hash_table (info);
801 BFD_ASSERT (htab != NULL);
803 dynobj = htab->elf.dynobj;
805 /* Make sure we know what is going on here. */
806 BFD_ASSERT (dynobj != NULL
808 || h->type == STT_GNU_IFUNC
812 && !h->def_regular)));
814 /* If this is a function, put it in the procedure linkage table. We
815 will fill in the contents of the procedure linkage table later
816 (although we could actually do it here). */
817 if (h->type == STT_FUNC || h->type == STT_GNU_IFUNC || h->needs_plt)
819 if (h->plt.refcount <= 0
820 || SYMBOL_CALLS_LOCAL (info, h)
821 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
822 && h->root.type == bfd_link_hash_undefweak))
824 /* This case can occur if we saw a R_RISCV_CALL_PLT reloc in an
825 input file, but the symbol was never referred to by a dynamic
826 object, or if all references were garbage collected. In such
827 a case, we don't actually need to build a PLT entry. */
828 h->plt.offset = (bfd_vma) -1;
835 h->plt.offset = (bfd_vma) -1;
837 /* If this is a weak symbol, and there is a real definition, the
838 processor independent code will have arranged for us to see the
839 real definition first, and we can just use the same value. */
842 struct elf_link_hash_entry *def = weakdef (h);
843 BFD_ASSERT (def->root.type == bfd_link_hash_defined);
844 h->root.u.def.section = def->root.u.def.section;
845 h->root.u.def.value = def->root.u.def.value;
849 /* This is a reference to a symbol defined by a dynamic object which
850 is not a function. */
852 /* If we are creating a shared library, we must presume that the
853 only references to the symbol are via the global offset table.
854 For such cases we need not do anything here; the relocations will
855 be handled correctly by relocate_section. */
856 if (bfd_link_pic (info))
859 /* If there are no references to this symbol that do not use the
860 GOT, we don't need to generate a copy reloc. */
864 /* If -z nocopyreloc was given, we won't generate them either. */
865 if (info->nocopyreloc)
871 /* If we don't find any dynamic relocs in read-only sections, then
872 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
873 if (!readonly_dynrelocs (h))
879 /* We must allocate the symbol in our .dynbss section, which will
880 become part of the .bss section of the executable. There will be
881 an entry for this symbol in the .dynsym section. The dynamic
882 object will contain position independent code, so all references
883 from the dynamic object to this symbol will go through the global
884 offset table. The dynamic linker will use the .dynsym entry to
885 determine the address it must put in the global offset table, so
886 both the dynamic object and the regular object will refer to the
887 same memory location for the variable. */
889 /* We must generate a R_RISCV_COPY reloc to tell the dynamic linker
890 to copy the initial value out of the dynamic object and into the
891 runtime process image. We need to remember the offset into the
892 .rel.bss section we are going to use. */
893 eh = (struct riscv_elf_link_hash_entry *) h;
894 if (eh->tls_type & ~GOT_NORMAL)
897 srel = htab->elf.srelbss;
899 else if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
901 s = htab->elf.sdynrelro;
902 srel = htab->elf.sreldynrelro;
906 s = htab->elf.sdynbss;
907 srel = htab->elf.srelbss;
909 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
911 srel->size += sizeof (ElfNN_External_Rela);
915 return _bfd_elf_adjust_dynamic_copy (info, h, s);
918 /* Allocate space in .plt, .got and associated reloc sections for
922 allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
924 struct bfd_link_info *info;
925 struct riscv_elf_link_hash_table *htab;
926 struct riscv_elf_link_hash_entry *eh;
927 struct elf_dyn_relocs *p;
929 if (h->root.type == bfd_link_hash_indirect)
932 info = (struct bfd_link_info *) inf;
933 htab = riscv_elf_hash_table (info);
934 BFD_ASSERT (htab != NULL);
936 if (htab->elf.dynamic_sections_created
937 && h->plt.refcount > 0)
939 /* Make sure this symbol is output as a dynamic symbol.
940 Undefined weak syms won't yet be marked as dynamic. */
944 if (! bfd_elf_link_record_dynamic_symbol (info, h))
948 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, bfd_link_pic (info), h))
950 asection *s = htab->elf.splt;
953 s->size = PLT_HEADER_SIZE;
955 h->plt.offset = s->size;
957 /* Make room for this entry. */
958 s->size += PLT_ENTRY_SIZE;
960 /* We also need to make an entry in the .got.plt section. */
961 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
963 /* We also need to make an entry in the .rela.plt section. */
964 htab->elf.srelplt->size += sizeof (ElfNN_External_Rela);
966 /* If this symbol is not defined in a regular file, and we are
967 not generating a shared library, then set the symbol to this
968 location in the .plt. This is required to make function
969 pointers compare as equal between the normal executable and
970 the shared library. */
971 if (! bfd_link_pic (info)
974 h->root.u.def.section = s;
975 h->root.u.def.value = h->plt.offset;
980 h->plt.offset = (bfd_vma) -1;
986 h->plt.offset = (bfd_vma) -1;
990 if (h->got.refcount > 0)
994 int tls_type = riscv_elf_hash_entry (h)->tls_type;
996 /* Make sure this symbol is output as a dynamic symbol.
997 Undefined weak syms won't yet be marked as dynamic. */
1001 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1006 h->got.offset = s->size;
1007 dyn = htab->elf.dynamic_sections_created;
1008 if (tls_type & (GOT_TLS_GD | GOT_TLS_IE))
1010 /* TLS_GD needs two dynamic relocs and two GOT slots. */
1011 if (tls_type & GOT_TLS_GD)
1013 s->size += 2 * RISCV_ELF_WORD_BYTES;
1014 htab->elf.srelgot->size += 2 * sizeof (ElfNN_External_Rela);
1017 /* TLS_IE needs one dynamic reloc and one GOT slot. */
1018 if (tls_type & GOT_TLS_IE)
1020 s->size += RISCV_ELF_WORD_BYTES;
1021 htab->elf.srelgot->size += sizeof (ElfNN_External_Rela);
1026 s->size += RISCV_ELF_WORD_BYTES;
1027 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, bfd_link_pic (info), h)
1028 && ! UNDEFWEAK_NO_DYNAMIC_RELOC (info, h))
1029 htab->elf.srelgot->size += sizeof (ElfNN_External_Rela);
1033 h->got.offset = (bfd_vma) -1;
1035 eh = (struct riscv_elf_link_hash_entry *) h;
1036 if (eh->dyn_relocs == NULL)
1039 /* In the shared -Bsymbolic case, discard space allocated for
1040 dynamic pc-relative relocs against symbols which turn out to be
1041 defined in regular objects. For the normal shared case, discard
1042 space for pc-relative relocs that have become local due to symbol
1043 visibility changes. */
1045 if (bfd_link_pic (info))
1047 if (SYMBOL_CALLS_LOCAL (info, h))
1049 struct elf_dyn_relocs **pp;
1051 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1053 p->count -= p->pc_count;
1062 /* Also discard relocs on undefined weak syms with non-default
1064 if (eh->dyn_relocs != NULL
1065 && h->root.type == bfd_link_hash_undefweak)
1067 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1068 || UNDEFWEAK_NO_DYNAMIC_RELOC (info, h))
1069 eh->dyn_relocs = NULL;
1071 /* Make sure undefined weak symbols are output as a dynamic
1073 else if (h->dynindx == -1
1074 && !h->forced_local)
1076 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1083 /* For the non-shared case, discard space for relocs against
1084 symbols which turn out to need copy relocs or are not
1090 || (htab->elf.dynamic_sections_created
1091 && (h->root.type == bfd_link_hash_undefweak
1092 || h->root.type == bfd_link_hash_undefined))))
1094 /* Make sure this symbol is output as a dynamic symbol.
1095 Undefined weak syms won't yet be marked as dynamic. */
1096 if (h->dynindx == -1
1097 && !h->forced_local)
1099 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1103 /* If that succeeded, we know we'll be keeping all the
1105 if (h->dynindx != -1)
1109 eh->dyn_relocs = NULL;
1114 /* Finally, allocate space. */
1115 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1117 asection *sreloc = elf_section_data (p->sec)->sreloc;
1118 sreloc->size += p->count * sizeof (ElfNN_External_Rela);
1124 /* Set DF_TEXTREL if we find any dynamic relocs that apply to
1125 read-only sections. */
1128 maybe_set_textrel (struct elf_link_hash_entry *h, void *info_p)
1132 if (h->root.type == bfd_link_hash_indirect)
1135 sec = readonly_dynrelocs (h);
1138 struct bfd_link_info *info = (struct bfd_link_info *) info_p;
1140 info->flags |= DF_TEXTREL;
1141 info->callbacks->minfo
1142 (_("%pB: dynamic relocation against `%pT' in read-only section `%pA'\n"),
1143 sec->owner, h->root.root.string, sec);
1145 /* Not an error, just cut short the traversal. */
1152 riscv_elf_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
1154 struct riscv_elf_link_hash_table *htab;
1159 htab = riscv_elf_hash_table (info);
1160 BFD_ASSERT (htab != NULL);
1161 dynobj = htab->elf.dynobj;
1162 BFD_ASSERT (dynobj != NULL);
1164 if (elf_hash_table (info)->dynamic_sections_created)
1166 /* Set the contents of the .interp section to the interpreter. */
1167 if (bfd_link_executable (info) && !info->nointerp)
1169 s = bfd_get_linker_section (dynobj, ".interp");
1170 BFD_ASSERT (s != NULL);
1171 s->size = strlen (ELFNN_DYNAMIC_INTERPRETER) + 1;
1172 s->contents = (unsigned char *) ELFNN_DYNAMIC_INTERPRETER;
1176 /* Set up .got offsets for local syms, and space for local dynamic
1178 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
1180 bfd_signed_vma *local_got;
1181 bfd_signed_vma *end_local_got;
1182 char *local_tls_type;
1183 bfd_size_type locsymcount;
1184 Elf_Internal_Shdr *symtab_hdr;
1187 if (! is_riscv_elf (ibfd))
1190 for (s = ibfd->sections; s != NULL; s = s->next)
1192 struct elf_dyn_relocs *p;
1194 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next)
1196 if (!bfd_is_abs_section (p->sec)
1197 && bfd_is_abs_section (p->sec->output_section))
1199 /* Input section has been discarded, either because
1200 it is a copy of a linkonce section or due to
1201 linker script /DISCARD/, so we'll be discarding
1204 else if (p->count != 0)
1206 srel = elf_section_data (p->sec)->sreloc;
1207 srel->size += p->count * sizeof (ElfNN_External_Rela);
1208 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
1209 info->flags |= DF_TEXTREL;
1214 local_got = elf_local_got_refcounts (ibfd);
1218 symtab_hdr = &elf_symtab_hdr (ibfd);
1219 locsymcount = symtab_hdr->sh_info;
1220 end_local_got = local_got + locsymcount;
1221 local_tls_type = _bfd_riscv_elf_local_got_tls_type (ibfd);
1223 srel = htab->elf.srelgot;
1224 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
1228 *local_got = s->size;
1229 s->size += RISCV_ELF_WORD_BYTES;
1230 if (*local_tls_type & GOT_TLS_GD)
1231 s->size += RISCV_ELF_WORD_BYTES;
1232 if (bfd_link_pic (info)
1233 || (*local_tls_type & (GOT_TLS_GD | GOT_TLS_IE)))
1234 srel->size += sizeof (ElfNN_External_Rela);
1237 *local_got = (bfd_vma) -1;
1241 /* Allocate global sym .plt and .got entries, and space for global
1242 sym dynamic relocs. */
1243 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info);
1245 if (htab->elf.sgotplt)
1247 struct elf_link_hash_entry *got;
1248 got = elf_link_hash_lookup (elf_hash_table (info),
1249 "_GLOBAL_OFFSET_TABLE_",
1250 FALSE, FALSE, FALSE);
1252 /* Don't allocate .got.plt section if there are no GOT nor PLT
1253 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
1255 || !got->ref_regular_nonweak)
1256 && (htab->elf.sgotplt->size == GOTPLT_HEADER_SIZE)
1257 && (htab->elf.splt == NULL
1258 || htab->elf.splt->size == 0)
1259 && (htab->elf.sgot == NULL
1260 || (htab->elf.sgot->size
1261 == get_elf_backend_data (output_bfd)->got_header_size)))
1262 htab->elf.sgotplt->size = 0;
1265 /* The check_relocs and adjust_dynamic_symbol entry points have
1266 determined the sizes of the various dynamic sections. Allocate
1268 for (s = dynobj->sections; s != NULL; s = s->next)
1270 if ((s->flags & SEC_LINKER_CREATED) == 0)
1273 if (s == htab->elf.splt
1274 || s == htab->elf.sgot
1275 || s == htab->elf.sgotplt
1276 || s == htab->elf.sdynbss
1277 || s == htab->elf.sdynrelro
1278 || s == htab->sdyntdata)
1280 /* Strip this section if we don't need it; see the
1283 else if (strncmp (s->name, ".rela", 5) == 0)
1287 /* We use the reloc_count field as a counter if we need
1288 to copy relocs into the output file. */
1294 /* It's not one of our sections. */
1300 /* If we don't need this section, strip it from the
1301 output file. This is mostly to handle .rela.bss and
1302 .rela.plt. We must create both sections in
1303 create_dynamic_sections, because they must be created
1304 before the linker maps input sections to output
1305 sections. The linker does that before
1306 adjust_dynamic_symbol is called, and it is that
1307 function which decides whether anything needs to go
1308 into these sections. */
1309 s->flags |= SEC_EXCLUDE;
1313 if ((s->flags & SEC_HAS_CONTENTS) == 0)
1316 /* Allocate memory for the section contents. Zero the memory
1317 for the benefit of .rela.plt, which has 4 unused entries
1318 at the beginning, and we don't want garbage. */
1319 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
1320 if (s->contents == NULL)
1324 if (elf_hash_table (info)->dynamic_sections_created)
1326 /* Add some entries to the .dynamic section. We fill in the
1327 values later, in riscv_elf_finish_dynamic_sections, but we
1328 must add the entries now so that we get the correct size for
1329 the .dynamic section. The DT_DEBUG entry is filled in by the
1330 dynamic linker and used by the debugger. */
1331 #define add_dynamic_entry(TAG, VAL) \
1332 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1334 if (bfd_link_executable (info))
1336 if (!add_dynamic_entry (DT_DEBUG, 0))
1340 if (htab->elf.srelplt->size != 0)
1342 if (!add_dynamic_entry (DT_PLTGOT, 0)
1343 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1344 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1345 || !add_dynamic_entry (DT_JMPREL, 0))
1349 if (!add_dynamic_entry (DT_RELA, 0)
1350 || !add_dynamic_entry (DT_RELASZ, 0)
1351 || !add_dynamic_entry (DT_RELAENT, sizeof (ElfNN_External_Rela)))
1354 /* If any dynamic relocs apply to a read-only section,
1355 then we need a DT_TEXTREL entry. */
1356 if ((info->flags & DF_TEXTREL) == 0)
1357 elf_link_hash_traverse (&htab->elf, maybe_set_textrel, info);
1359 if (info->flags & DF_TEXTREL)
1361 if (!add_dynamic_entry (DT_TEXTREL, 0))
1365 #undef add_dynamic_entry
1371 #define DTP_OFFSET 0x800
1373 /* Return the relocation value for a TLS dtp-relative reloc. */
1376 dtpoff (struct bfd_link_info *info, bfd_vma address)
1378 /* If tls_sec is NULL, we should have signalled an error already. */
1379 if (elf_hash_table (info)->tls_sec == NULL)
1381 return address - elf_hash_table (info)->tls_sec->vma - DTP_OFFSET;
1384 /* Return the relocation value for a static TLS tp-relative relocation. */
1387 tpoff (struct bfd_link_info *info, bfd_vma address)
1389 /* If tls_sec is NULL, we should have signalled an error already. */
1390 if (elf_hash_table (info)->tls_sec == NULL)
1392 return address - elf_hash_table (info)->tls_sec->vma - TP_OFFSET;
1395 /* Return the global pointer's value, or 0 if it is not in use. */
1398 riscv_global_pointer_value (struct bfd_link_info *info)
1400 struct bfd_link_hash_entry *h;
1402 h = bfd_link_hash_lookup (info->hash, RISCV_GP_SYMBOL, FALSE, FALSE, TRUE);
1403 if (h == NULL || h->type != bfd_link_hash_defined)
1406 return h->u.def.value + sec_addr (h->u.def.section);
1409 /* Emplace a static relocation. */
1411 static bfd_reloc_status_type
1412 perform_relocation (const reloc_howto_type *howto,
1413 const Elf_Internal_Rela *rel,
1415 asection *input_section,
1419 if (howto->pc_relative)
1420 value -= sec_addr (input_section) + rel->r_offset;
1421 value += rel->r_addend;
1423 switch (ELFNN_R_TYPE (rel->r_info))
1426 case R_RISCV_TPREL_HI20:
1427 case R_RISCV_PCREL_HI20:
1428 case R_RISCV_GOT_HI20:
1429 case R_RISCV_TLS_GOT_HI20:
1430 case R_RISCV_TLS_GD_HI20:
1431 if (ARCH_SIZE > 32 && !VALID_UTYPE_IMM (RISCV_CONST_HIGH_PART (value)))
1432 return bfd_reloc_overflow;
1433 value = ENCODE_UTYPE_IMM (RISCV_CONST_HIGH_PART (value));
1436 case R_RISCV_LO12_I:
1437 case R_RISCV_GPREL_I:
1438 case R_RISCV_TPREL_LO12_I:
1439 case R_RISCV_TPREL_I:
1440 case R_RISCV_PCREL_LO12_I:
1441 value = ENCODE_ITYPE_IMM (value);
1444 case R_RISCV_LO12_S:
1445 case R_RISCV_GPREL_S:
1446 case R_RISCV_TPREL_LO12_S:
1447 case R_RISCV_TPREL_S:
1448 case R_RISCV_PCREL_LO12_S:
1449 value = ENCODE_STYPE_IMM (value);
1453 case R_RISCV_CALL_PLT:
1454 if (ARCH_SIZE > 32 && !VALID_UTYPE_IMM (RISCV_CONST_HIGH_PART (value)))
1455 return bfd_reloc_overflow;
1456 value = ENCODE_UTYPE_IMM (RISCV_CONST_HIGH_PART (value))
1457 | (ENCODE_ITYPE_IMM (value) << 32);
1461 if (!VALID_UJTYPE_IMM (value))
1462 return bfd_reloc_overflow;
1463 value = ENCODE_UJTYPE_IMM (value);
1466 case R_RISCV_BRANCH:
1467 if (!VALID_SBTYPE_IMM (value))
1468 return bfd_reloc_overflow;
1469 value = ENCODE_SBTYPE_IMM (value);
1472 case R_RISCV_RVC_BRANCH:
1473 if (!VALID_RVC_B_IMM (value))
1474 return bfd_reloc_overflow;
1475 value = ENCODE_RVC_B_IMM (value);
1478 case R_RISCV_RVC_JUMP:
1479 if (!VALID_RVC_J_IMM (value))
1480 return bfd_reloc_overflow;
1481 value = ENCODE_RVC_J_IMM (value);
1484 case R_RISCV_RVC_LUI:
1485 if (RISCV_CONST_HIGH_PART (value) == 0)
1487 /* Linker relaxation can convert an address equal to or greater than
1488 0x800 to slightly below 0x800. C.LUI does not accept zero as a
1489 valid immediate. We can fix this by converting it to a C.LI. */
1490 bfd_vma insn = bfd_get (howto->bitsize, input_bfd,
1491 contents + rel->r_offset);
1492 insn = (insn & ~MATCH_C_LUI) | MATCH_C_LI;
1493 bfd_put (howto->bitsize, input_bfd, insn, contents + rel->r_offset);
1494 value = ENCODE_RVC_IMM (0);
1496 else if (!VALID_RVC_LUI_IMM (RISCV_CONST_HIGH_PART (value)))
1497 return bfd_reloc_overflow;
1499 value = ENCODE_RVC_LUI_IMM (RISCV_CONST_HIGH_PART (value));
1517 case R_RISCV_32_PCREL:
1518 case R_RISCV_TLS_DTPREL32:
1519 case R_RISCV_TLS_DTPREL64:
1522 case R_RISCV_DELETE:
1523 return bfd_reloc_ok;
1526 return bfd_reloc_notsupported;
1529 bfd_vma word = bfd_get (howto->bitsize, input_bfd, contents + rel->r_offset);
1530 word = (word & ~howto->dst_mask) | (value & howto->dst_mask);
1531 bfd_put (howto->bitsize, input_bfd, word, contents + rel->r_offset);
1533 return bfd_reloc_ok;
1536 /* Remember all PC-relative high-part relocs we've encountered to help us
1537 later resolve the corresponding low-part relocs. */
1543 } riscv_pcrel_hi_reloc;
1545 typedef struct riscv_pcrel_lo_reloc
1547 asection * input_section;
1548 struct bfd_link_info * info;
1549 reloc_howto_type * howto;
1550 const Elf_Internal_Rela * reloc;
1553 bfd_byte * contents;
1554 struct riscv_pcrel_lo_reloc * next;
1555 } riscv_pcrel_lo_reloc;
1560 riscv_pcrel_lo_reloc *lo_relocs;
1561 } riscv_pcrel_relocs;
1564 riscv_pcrel_reloc_hash (const void *entry)
1566 const riscv_pcrel_hi_reloc *e = entry;
1567 return (hashval_t)(e->address >> 2);
1571 riscv_pcrel_reloc_eq (const void *entry1, const void *entry2)
1573 const riscv_pcrel_hi_reloc *e1 = entry1, *e2 = entry2;
1574 return e1->address == e2->address;
1578 riscv_init_pcrel_relocs (riscv_pcrel_relocs *p)
1581 p->lo_relocs = NULL;
1582 p->hi_relocs = htab_create (1024, riscv_pcrel_reloc_hash,
1583 riscv_pcrel_reloc_eq, free);
1584 return p->hi_relocs != NULL;
1588 riscv_free_pcrel_relocs (riscv_pcrel_relocs *p)
1590 riscv_pcrel_lo_reloc *cur = p->lo_relocs;
1594 riscv_pcrel_lo_reloc *next = cur->next;
1599 htab_delete (p->hi_relocs);
1603 riscv_zero_pcrel_hi_reloc (Elf_Internal_Rela *rel,
1604 struct bfd_link_info *info,
1608 const reloc_howto_type *howto,
1611 /* We may need to reference low addreses in PC-relative modes even when the
1612 * PC is far away from these addresses. For example, undefweak references
1613 * need to produce the address 0 when linked. As 0 is far from the arbitrary
1614 * addresses that we can link PC-relative programs at, the linker can't
1615 * actually relocate references to those symbols. In order to allow these
1616 * programs to work we simply convert the PC-relative auipc sequences to
1617 * 0-relative lui sequences. */
1618 if (bfd_link_pic (info))
1621 /* If it's possible to reference the symbol using auipc we do so, as that's
1622 * more in the spirit of the PC-relative relocations we're processing. */
1623 bfd_vma offset = addr - pc;
1624 if (ARCH_SIZE == 32 || VALID_UTYPE_IMM (RISCV_CONST_HIGH_PART (offset)))
1627 /* If it's impossible to reference this with a LUI-based offset then don't
1628 * bother to convert it at all so users still see the PC-relative relocation
1629 * in the truncation message. */
1630 if (ARCH_SIZE > 32 && !VALID_UTYPE_IMM (RISCV_CONST_HIGH_PART (addr)))
1633 rel->r_info = ELFNN_R_INFO(addr, R_RISCV_HI20);
1635 bfd_vma insn = bfd_get(howto->bitsize, input_bfd, contents + rel->r_offset);
1636 insn = (insn & ~MASK_AUIPC) | MATCH_LUI;
1637 bfd_put(howto->bitsize, input_bfd, insn, contents + rel->r_offset);
1642 riscv_record_pcrel_hi_reloc (riscv_pcrel_relocs *p, bfd_vma addr,
1643 bfd_vma value, bfd_boolean absolute)
1645 bfd_vma offset = absolute ? value : value - addr;
1646 riscv_pcrel_hi_reloc entry = {addr, offset};
1647 riscv_pcrel_hi_reloc **slot =
1648 (riscv_pcrel_hi_reloc **) htab_find_slot (p->hi_relocs, &entry, INSERT);
1650 BFD_ASSERT (*slot == NULL);
1651 *slot = (riscv_pcrel_hi_reloc *) bfd_malloc (sizeof (riscv_pcrel_hi_reloc));
1659 riscv_record_pcrel_lo_reloc (riscv_pcrel_relocs *p,
1660 asection *input_section,
1661 struct bfd_link_info *info,
1662 reloc_howto_type *howto,
1663 const Elf_Internal_Rela *reloc,
1668 riscv_pcrel_lo_reloc *entry;
1669 entry = (riscv_pcrel_lo_reloc *) bfd_malloc (sizeof (riscv_pcrel_lo_reloc));
1672 *entry = (riscv_pcrel_lo_reloc) {input_section, info, howto, reloc, addr,
1673 name, contents, p->lo_relocs};
1674 p->lo_relocs = entry;
1679 riscv_resolve_pcrel_lo_relocs (riscv_pcrel_relocs *p)
1681 riscv_pcrel_lo_reloc *r;
1683 for (r = p->lo_relocs; r != NULL; r = r->next)
1685 bfd *input_bfd = r->input_section->owner;
1687 riscv_pcrel_hi_reloc search = {r->addr, 0};
1688 riscv_pcrel_hi_reloc *entry = htab_find (p->hi_relocs, &search);
1690 /* Check for overflow into bit 11 when adding reloc addend. */
1691 || (! (entry->value & 0x800)
1692 && ((entry->value + r->reloc->r_addend) & 0x800)))
1694 char *string = (entry == NULL
1695 ? "%pcrel_lo missing matching %pcrel_hi"
1696 : "%pcrel_lo overflow with an addend");
1697 (*r->info->callbacks->reloc_dangerous)
1698 (r->info, string, input_bfd, r->input_section, r->reloc->r_offset);
1702 perform_relocation (r->howto, r->reloc, entry->value, r->input_section,
1703 input_bfd, r->contents);
1709 /* Relocate a RISC-V ELF section.
1711 The RELOCATE_SECTION function is called by the new ELF backend linker
1712 to handle the relocations for a section.
1714 The relocs are always passed as Rela structures.
1716 This function is responsible for adjusting the section contents as
1717 necessary, and (if generating a relocatable output file) adjusting
1718 the reloc addend as necessary.
1720 This function does not have to worry about setting the reloc
1721 address or the reloc symbol index.
1723 LOCAL_SYMS is a pointer to the swapped in local symbols.
1725 LOCAL_SECTIONS is an array giving the section in the input file
1726 corresponding to the st_shndx field of each local symbol.
1728 The global hash table entry for the global symbols can be found
1729 via elf_sym_hashes (input_bfd).
1731 When generating relocatable output, this function must handle
1732 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
1733 going to be the section symbol corresponding to the output
1734 section, which means that the addend must be adjusted
1738 riscv_elf_relocate_section (bfd *output_bfd,
1739 struct bfd_link_info *info,
1741 asection *input_section,
1743 Elf_Internal_Rela *relocs,
1744 Elf_Internal_Sym *local_syms,
1745 asection **local_sections)
1747 Elf_Internal_Rela *rel;
1748 Elf_Internal_Rela *relend;
1749 riscv_pcrel_relocs pcrel_relocs;
1750 bfd_boolean ret = FALSE;
1751 asection *sreloc = elf_section_data (input_section)->sreloc;
1752 struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info);
1753 Elf_Internal_Shdr *symtab_hdr = &elf_symtab_hdr (input_bfd);
1754 struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (input_bfd);
1755 bfd_vma *local_got_offsets = elf_local_got_offsets (input_bfd);
1756 bfd_boolean absolute;
1758 if (!riscv_init_pcrel_relocs (&pcrel_relocs))
1761 relend = relocs + input_section->reloc_count;
1762 for (rel = relocs; rel < relend; rel++)
1764 unsigned long r_symndx;
1765 struct elf_link_hash_entry *h;
1766 Elf_Internal_Sym *sym;
1769 bfd_reloc_status_type r = bfd_reloc_ok;
1771 bfd_vma off, ie_off;
1772 bfd_boolean unresolved_reloc, is_ie = FALSE;
1773 bfd_vma pc = sec_addr (input_section) + rel->r_offset;
1774 int r_type = ELFNN_R_TYPE (rel->r_info), tls_type;
1775 reloc_howto_type *howto = riscv_elf_rtype_to_howto (input_bfd, r_type);
1776 const char *msg = NULL;
1777 bfd_boolean resolved_to_zero;
1780 || r_type == R_RISCV_GNU_VTINHERIT || r_type == R_RISCV_GNU_VTENTRY)
1783 /* This is a final link. */
1784 r_symndx = ELFNN_R_SYM (rel->r_info);
1788 unresolved_reloc = FALSE;
1789 if (r_symndx < symtab_hdr->sh_info)
1791 sym = local_syms + r_symndx;
1792 sec = local_sections[r_symndx];
1793 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
1797 bfd_boolean warned, ignored;
1799 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
1800 r_symndx, symtab_hdr, sym_hashes,
1802 unresolved_reloc, warned, ignored);
1805 /* To avoid generating warning messages about truncated
1806 relocations, set the relocation's address to be the same as
1807 the start of this section. */
1808 if (input_section->output_section != NULL)
1809 relocation = input_section->output_section->vma;
1815 if (sec != NULL && discarded_section (sec))
1816 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
1817 rel, 1, relend, howto, 0, contents);
1819 if (bfd_link_relocatable (info))
1823 name = h->root.root.string;
1826 name = (bfd_elf_string_from_elf_section
1827 (input_bfd, symtab_hdr->sh_link, sym->st_name));
1828 if (name == NULL || *name == '\0')
1829 name = bfd_section_name (input_bfd, sec);
1832 resolved_to_zero = (h != NULL
1833 && UNDEFWEAK_NO_DYNAMIC_RELOC (info, h));
1839 case R_RISCV_TPREL_ADD:
1841 case R_RISCV_JUMP_SLOT:
1842 case R_RISCV_RELATIVE:
1843 /* These require nothing of us at all. */
1847 case R_RISCV_BRANCH:
1848 case R_RISCV_RVC_BRANCH:
1849 case R_RISCV_RVC_LUI:
1850 case R_RISCV_LO12_I:
1851 case R_RISCV_LO12_S:
1856 case R_RISCV_32_PCREL:
1857 case R_RISCV_DELETE:
1858 /* These require no special handling beyond perform_relocation. */
1861 case R_RISCV_GOT_HI20:
1864 bfd_boolean dyn, pic;
1866 off = h->got.offset;
1867 BFD_ASSERT (off != (bfd_vma) -1);
1868 dyn = elf_hash_table (info)->dynamic_sections_created;
1869 pic = bfd_link_pic (info);
1871 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, pic, h)
1872 || (pic && SYMBOL_REFERENCES_LOCAL (info, h)))
1874 /* This is actually a static link, or it is a
1875 -Bsymbolic link and the symbol is defined
1876 locally, or the symbol was forced to be local
1877 because of a version file. We must initialize
1878 this entry in the global offset table. Since the
1879 offset must always be a multiple of the word size,
1880 we use the least significant bit to record whether
1881 we have initialized it already.
1883 When doing a dynamic link, we create a .rela.got
1884 relocation entry to initialize the value. This
1885 is done in the finish_dynamic_symbol routine. */
1890 bfd_put_NN (output_bfd, relocation,
1891 htab->elf.sgot->contents + off);
1896 unresolved_reloc = FALSE;
1900 BFD_ASSERT (local_got_offsets != NULL
1901 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1903 off = local_got_offsets[r_symndx];
1905 /* The offset must always be a multiple of the word size.
1906 So, we can use the least significant bit to record
1907 whether we have already processed this entry. */
1912 if (bfd_link_pic (info))
1915 Elf_Internal_Rela outrel;
1917 /* We need to generate a R_RISCV_RELATIVE reloc
1918 for the dynamic linker. */
1919 s = htab->elf.srelgot;
1920 BFD_ASSERT (s != NULL);
1922 outrel.r_offset = sec_addr (htab->elf.sgot) + off;
1924 ELFNN_R_INFO (0, R_RISCV_RELATIVE);
1925 outrel.r_addend = relocation;
1927 riscv_elf_append_rela (output_bfd, s, &outrel);
1930 bfd_put_NN (output_bfd, relocation,
1931 htab->elf.sgot->contents + off);
1932 local_got_offsets[r_symndx] |= 1;
1935 relocation = sec_addr (htab->elf.sgot) + off;
1936 absolute = riscv_zero_pcrel_hi_reloc (rel,
1943 r_type = ELFNN_R_TYPE (rel->r_info);
1944 howto = riscv_elf_rtype_to_howto (input_bfd, r_type);
1946 r = bfd_reloc_notsupported;
1947 else if (!riscv_record_pcrel_hi_reloc (&pcrel_relocs, pc,
1948 relocation, absolute))
1949 r = bfd_reloc_overflow;
1957 bfd_vma old_value = bfd_get (howto->bitsize, input_bfd,
1958 contents + rel->r_offset);
1959 relocation = old_value + relocation;
1969 bfd_vma old_value = bfd_get (howto->bitsize, input_bfd,
1970 contents + rel->r_offset);
1971 relocation = old_value - relocation;
1976 /* Handle a call to an undefined weak function. This won't be
1977 relaxed, so we have to handle it here. */
1978 if (h != NULL && h->root.type == bfd_link_hash_undefweak
1979 && h->plt.offset == MINUS_ONE)
1981 /* We can use x0 as the base register. */
1982 bfd_vma insn = bfd_get_32 (input_bfd,
1983 contents + rel->r_offset + 4);
1984 insn &= ~(OP_MASK_RS1 << OP_SH_RS1);
1985 bfd_put_32 (input_bfd, insn, contents + rel->r_offset + 4);
1986 /* Set the relocation value so that we get 0 after the pc
1987 relative adjustment. */
1988 relocation = sec_addr (input_section) + rel->r_offset;
1992 case R_RISCV_CALL_PLT:
1994 case R_RISCV_RVC_JUMP:
1995 if (bfd_link_pic (info) && h != NULL && h->plt.offset != MINUS_ONE)
1997 /* Refer to the PLT entry. */
1998 relocation = sec_addr (htab->elf.splt) + h->plt.offset;
1999 unresolved_reloc = FALSE;
2003 case R_RISCV_TPREL_HI20:
2004 relocation = tpoff (info, relocation);
2007 case R_RISCV_TPREL_LO12_I:
2008 case R_RISCV_TPREL_LO12_S:
2009 relocation = tpoff (info, relocation);
2012 case R_RISCV_TPREL_I:
2013 case R_RISCV_TPREL_S:
2014 relocation = tpoff (info, relocation);
2015 if (VALID_ITYPE_IMM (relocation + rel->r_addend))
2017 /* We can use tp as the base register. */
2018 bfd_vma insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
2019 insn &= ~(OP_MASK_RS1 << OP_SH_RS1);
2020 insn |= X_TP << OP_SH_RS1;
2021 bfd_put_32 (input_bfd, insn, contents + rel->r_offset);
2024 r = bfd_reloc_overflow;
2027 case R_RISCV_GPREL_I:
2028 case R_RISCV_GPREL_S:
2030 bfd_vma gp = riscv_global_pointer_value (info);
2031 bfd_boolean x0_base = VALID_ITYPE_IMM (relocation + rel->r_addend);
2032 if (x0_base || VALID_ITYPE_IMM (relocation + rel->r_addend - gp))
2034 /* We can use x0 or gp as the base register. */
2035 bfd_vma insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
2036 insn &= ~(OP_MASK_RS1 << OP_SH_RS1);
2039 rel->r_addend -= gp;
2040 insn |= X_GP << OP_SH_RS1;
2042 bfd_put_32 (input_bfd, insn, contents + rel->r_offset);
2045 r = bfd_reloc_overflow;
2049 case R_RISCV_PCREL_HI20:
2050 absolute = riscv_zero_pcrel_hi_reloc (rel,
2057 r_type = ELFNN_R_TYPE (rel->r_info);
2058 howto = riscv_elf_rtype_to_howto (input_bfd, r_type);
2060 r = bfd_reloc_notsupported;
2061 else if (!riscv_record_pcrel_hi_reloc (&pcrel_relocs, pc,
2062 relocation + rel->r_addend,
2064 r = bfd_reloc_overflow;
2067 case R_RISCV_PCREL_LO12_I:
2068 case R_RISCV_PCREL_LO12_S:
2069 /* We don't allow section symbols plus addends as the auipc address,
2070 because then riscv_relax_delete_bytes would have to search through
2071 all relocs to update these addends. This is also ambiguous, as
2072 we do allow offsets to be added to the target address, which are
2073 not to be used to find the auipc address. */
2074 if (((sym != NULL && (ELF_ST_TYPE (sym->st_info) == STT_SECTION))
2075 || (h != NULL && h->type == STT_SECTION))
2078 r = bfd_reloc_dangerous;
2082 if (riscv_record_pcrel_lo_reloc (&pcrel_relocs, input_section, info,
2083 howto, rel, relocation, name,
2086 r = bfd_reloc_overflow;
2089 case R_RISCV_TLS_DTPREL32:
2090 case R_RISCV_TLS_DTPREL64:
2091 relocation = dtpoff (info, relocation);
2096 if ((input_section->flags & SEC_ALLOC) == 0)
2099 if ((bfd_link_pic (info)
2101 || (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2102 && !resolved_to_zero)
2103 || h->root.type != bfd_link_hash_undefweak)
2104 && (! howto->pc_relative
2105 || !SYMBOL_CALLS_LOCAL (info, h)))
2106 || (!bfd_link_pic (info)
2112 || h->root.type == bfd_link_hash_undefweak
2113 || h->root.type == bfd_link_hash_undefined)))
2115 Elf_Internal_Rela outrel;
2116 bfd_boolean skip_static_relocation, skip_dynamic_relocation;
2118 /* When generating a shared object, these relocations
2119 are copied into the output file to be resolved at run
2123 _bfd_elf_section_offset (output_bfd, info, input_section,
2125 skip_static_relocation = outrel.r_offset != (bfd_vma) -2;
2126 skip_dynamic_relocation = outrel.r_offset >= (bfd_vma) -2;
2127 outrel.r_offset += sec_addr (input_section);
2129 if (skip_dynamic_relocation)
2130 memset (&outrel, 0, sizeof outrel);
2131 else if (h != NULL && h->dynindx != -1
2132 && !(bfd_link_pic (info)
2133 && SYMBOLIC_BIND (info, h)
2136 outrel.r_info = ELFNN_R_INFO (h->dynindx, r_type);
2137 outrel.r_addend = rel->r_addend;
2141 outrel.r_info = ELFNN_R_INFO (0, R_RISCV_RELATIVE);
2142 outrel.r_addend = relocation + rel->r_addend;
2145 riscv_elf_append_rela (output_bfd, sreloc, &outrel);
2146 if (skip_static_relocation)
2151 case R_RISCV_TLS_GOT_HI20:
2155 case R_RISCV_TLS_GD_HI20:
2158 off = h->got.offset;
2163 off = local_got_offsets[r_symndx];
2164 local_got_offsets[r_symndx] |= 1;
2167 tls_type = _bfd_riscv_elf_tls_type (input_bfd, h, r_symndx);
2168 BFD_ASSERT (tls_type & (GOT_TLS_IE | GOT_TLS_GD));
2169 /* If this symbol is referenced by both GD and IE TLS, the IE
2170 reference's GOT slot follows the GD reference's slots. */
2172 if ((tls_type & GOT_TLS_GD) && (tls_type & GOT_TLS_IE))
2173 ie_off = 2 * GOT_ENTRY_SIZE;
2179 Elf_Internal_Rela outrel;
2181 bfd_boolean need_relocs = FALSE;
2183 if (htab->elf.srelgot == NULL)
2188 bfd_boolean dyn, pic;
2189 dyn = htab->elf.dynamic_sections_created;
2190 pic = bfd_link_pic (info);
2192 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, pic, h)
2193 && (!pic || !SYMBOL_REFERENCES_LOCAL (info, h)))
2197 /* The GOT entries have not been initialized yet. Do it
2198 now, and emit any relocations. */
2199 if ((bfd_link_pic (info) || indx != 0)
2201 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2202 || h->root.type != bfd_link_hash_undefweak))
2205 if (tls_type & GOT_TLS_GD)
2209 outrel.r_offset = sec_addr (htab->elf.sgot) + off;
2210 outrel.r_addend = 0;
2211 outrel.r_info = ELFNN_R_INFO (indx, R_RISCV_TLS_DTPMODNN);
2212 bfd_put_NN (output_bfd, 0,
2213 htab->elf.sgot->contents + off);
2214 riscv_elf_append_rela (output_bfd, htab->elf.srelgot, &outrel);
2217 BFD_ASSERT (! unresolved_reloc);
2218 bfd_put_NN (output_bfd,
2219 dtpoff (info, relocation),
2220 (htab->elf.sgot->contents + off +
2221 RISCV_ELF_WORD_BYTES));
2225 bfd_put_NN (output_bfd, 0,
2226 (htab->elf.sgot->contents + off +
2227 RISCV_ELF_WORD_BYTES));
2228 outrel.r_info = ELFNN_R_INFO (indx, R_RISCV_TLS_DTPRELNN);
2229 outrel.r_offset += RISCV_ELF_WORD_BYTES;
2230 riscv_elf_append_rela (output_bfd, htab->elf.srelgot, &outrel);
2235 /* If we are not emitting relocations for a
2236 general dynamic reference, then we must be in a
2237 static link or an executable link with the
2238 symbol binding locally. Mark it as belonging
2239 to module 1, the executable. */
2240 bfd_put_NN (output_bfd, 1,
2241 htab->elf.sgot->contents + off);
2242 bfd_put_NN (output_bfd,
2243 dtpoff (info, relocation),
2244 (htab->elf.sgot->contents + off +
2245 RISCV_ELF_WORD_BYTES));
2249 if (tls_type & GOT_TLS_IE)
2253 bfd_put_NN (output_bfd, 0,
2254 htab->elf.sgot->contents + off + ie_off);
2255 outrel.r_offset = sec_addr (htab->elf.sgot)
2257 outrel.r_addend = 0;
2259 outrel.r_addend = tpoff (info, relocation);
2260 outrel.r_info = ELFNN_R_INFO (indx, R_RISCV_TLS_TPRELNN);
2261 riscv_elf_append_rela (output_bfd, htab->elf.srelgot, &outrel);
2265 bfd_put_NN (output_bfd, tpoff (info, relocation),
2266 htab->elf.sgot->contents + off + ie_off);
2271 BFD_ASSERT (off < (bfd_vma) -2);
2272 relocation = sec_addr (htab->elf.sgot) + off + (is_ie ? ie_off : 0);
2273 if (!riscv_record_pcrel_hi_reloc (&pcrel_relocs, pc,
2275 r = bfd_reloc_overflow;
2276 unresolved_reloc = FALSE;
2280 r = bfd_reloc_notsupported;
2283 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2284 because such sections are not SEC_ALLOC and thus ld.so will
2285 not process them. */
2286 if (unresolved_reloc
2287 && !((input_section->flags & SEC_DEBUGGING) != 0
2289 && _bfd_elf_section_offset (output_bfd, info, input_section,
2290 rel->r_offset) != (bfd_vma) -1)
2292 (*_bfd_error_handler)
2293 (_("%pB(%pA+%#" PRIx64 "): "
2294 "unresolvable %s relocation against symbol `%s'"),
2297 (uint64_t) rel->r_offset,
2299 h->root.root.string);
2303 if (r == bfd_reloc_ok)
2304 r = perform_relocation (howto, rel, relocation, input_section,
2305 input_bfd, contents);
2312 case bfd_reloc_overflow:
2313 info->callbacks->reloc_overflow
2314 (info, (h ? &h->root : NULL), name, howto->name,
2315 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
2318 case bfd_reloc_undefined:
2319 info->callbacks->undefined_symbol
2320 (info, name, input_bfd, input_section, rel->r_offset,
2324 case bfd_reloc_outofrange:
2325 msg = _("%X%P: internal error: out of range error\n");
2328 case bfd_reloc_notsupported:
2329 msg = _("%X%P: internal error: unsupported relocation error\n");
2332 case bfd_reloc_dangerous:
2333 info->callbacks->reloc_dangerous
2334 (info, "%pcrel_lo section symbol with an addend", input_bfd,
2335 input_section, rel->r_offset);
2339 msg = _("%X%P: internal error: unknown error\n");
2344 info->callbacks->einfo (msg);
2346 /* We already reported the error via a callback, so don't try to report
2347 it again by returning false. That leads to spurious errors. */
2352 ret = riscv_resolve_pcrel_lo_relocs (&pcrel_relocs);
2354 riscv_free_pcrel_relocs (&pcrel_relocs);
2358 /* Finish up dynamic symbol handling. We set the contents of various
2359 dynamic sections here. */
2362 riscv_elf_finish_dynamic_symbol (bfd *output_bfd,
2363 struct bfd_link_info *info,
2364 struct elf_link_hash_entry *h,
2365 Elf_Internal_Sym *sym)
2367 struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info);
2368 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
2370 if (h->plt.offset != (bfd_vma) -1)
2372 /* We've decided to create a PLT entry for this symbol. */
2374 bfd_vma i, header_address, plt_idx, got_address;
2375 uint32_t plt_entry[PLT_ENTRY_INSNS];
2376 Elf_Internal_Rela rela;
2378 BFD_ASSERT (h->dynindx != -1);
2380 /* Calculate the address of the PLT header. */
2381 header_address = sec_addr (htab->elf.splt);
2383 /* Calculate the index of the entry. */
2384 plt_idx = (h->plt.offset - PLT_HEADER_SIZE) / PLT_ENTRY_SIZE;
2386 /* Calculate the address of the .got.plt entry. */
2387 got_address = riscv_elf_got_plt_val (plt_idx, info);
2389 /* Find out where the .plt entry should go. */
2390 loc = htab->elf.splt->contents + h->plt.offset;
2392 /* Fill in the PLT entry itself. */
2393 if (! riscv_make_plt_entry (output_bfd, got_address,
2394 header_address + h->plt.offset,
2398 for (i = 0; i < PLT_ENTRY_INSNS; i++)
2399 bfd_put_32 (output_bfd, plt_entry[i], loc + 4*i);
2401 /* Fill in the initial value of the .got.plt entry. */
2402 loc = htab->elf.sgotplt->contents
2403 + (got_address - sec_addr (htab->elf.sgotplt));
2404 bfd_put_NN (output_bfd, sec_addr (htab->elf.splt), loc);
2406 /* Fill in the entry in the .rela.plt section. */
2407 rela.r_offset = got_address;
2409 rela.r_info = ELFNN_R_INFO (h->dynindx, R_RISCV_JUMP_SLOT);
2411 loc = htab->elf.srelplt->contents + plt_idx * sizeof (ElfNN_External_Rela);
2412 bed->s->swap_reloca_out (output_bfd, &rela, loc);
2414 if (!h->def_regular)
2416 /* Mark the symbol as undefined, rather than as defined in
2417 the .plt section. Leave the value alone. */
2418 sym->st_shndx = SHN_UNDEF;
2419 /* If the symbol is weak, we do need to clear the value.
2420 Otherwise, the PLT entry would provide a definition for
2421 the symbol even if the symbol wasn't defined anywhere,
2422 and so the symbol would never be NULL. */
2423 if (!h->ref_regular_nonweak)
2428 if (h->got.offset != (bfd_vma) -1
2429 && !(riscv_elf_hash_entry (h)->tls_type & (GOT_TLS_GD | GOT_TLS_IE))
2430 && !UNDEFWEAK_NO_DYNAMIC_RELOC (info, h))
2434 Elf_Internal_Rela rela;
2436 /* This symbol has an entry in the GOT. Set it up. */
2438 sgot = htab->elf.sgot;
2439 srela = htab->elf.srelgot;
2440 BFD_ASSERT (sgot != NULL && srela != NULL);
2442 rela.r_offset = sec_addr (sgot) + (h->got.offset &~ (bfd_vma) 1);
2444 /* If this is a local symbol reference, we just want to emit a RELATIVE
2445 reloc. This can happen if it is a -Bsymbolic link, or a pie link, or
2446 the symbol was forced to be local because of a version file.
2447 The entry in the global offset table will already have been
2448 initialized in the relocate_section function. */
2449 if (bfd_link_pic (info)
2450 && SYMBOL_REFERENCES_LOCAL (info, h))
2452 BFD_ASSERT((h->got.offset & 1) != 0);
2453 asection *sec = h->root.u.def.section;
2454 rela.r_info = ELFNN_R_INFO (0, R_RISCV_RELATIVE);
2455 rela.r_addend = (h->root.u.def.value
2456 + sec->output_section->vma
2457 + sec->output_offset);
2461 BFD_ASSERT((h->got.offset & 1) == 0);
2462 BFD_ASSERT (h->dynindx != -1);
2463 rela.r_info = ELFNN_R_INFO (h->dynindx, R_RISCV_NN);
2467 bfd_put_NN (output_bfd, 0,
2468 sgot->contents + (h->got.offset & ~(bfd_vma) 1));
2469 riscv_elf_append_rela (output_bfd, srela, &rela);
2474 Elf_Internal_Rela rela;
2477 /* This symbols needs a copy reloc. Set it up. */
2478 BFD_ASSERT (h->dynindx != -1);
2480 rela.r_offset = sec_addr (h->root.u.def.section) + h->root.u.def.value;
2481 rela.r_info = ELFNN_R_INFO (h->dynindx, R_RISCV_COPY);
2483 if (h->root.u.def.section == htab->elf.sdynrelro)
2484 s = htab->elf.sreldynrelro;
2486 s = htab->elf.srelbss;
2487 riscv_elf_append_rela (output_bfd, s, &rela);
2490 /* Mark some specially defined symbols as absolute. */
2491 if (h == htab->elf.hdynamic
2492 || (h == htab->elf.hgot || h == htab->elf.hplt))
2493 sym->st_shndx = SHN_ABS;
2498 /* Finish up the dynamic sections. */
2501 riscv_finish_dyn (bfd *output_bfd, struct bfd_link_info *info,
2502 bfd *dynobj, asection *sdyn)
2504 struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info);
2505 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
2506 size_t dynsize = bed->s->sizeof_dyn;
2507 bfd_byte *dyncon, *dynconend;
2509 dynconend = sdyn->contents + sdyn->size;
2510 for (dyncon = sdyn->contents; dyncon < dynconend; dyncon += dynsize)
2512 Elf_Internal_Dyn dyn;
2515 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
2520 s = htab->elf.sgotplt;
2521 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
2524 s = htab->elf.srelplt;
2525 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
2528 s = htab->elf.srelplt;
2529 dyn.d_un.d_val = s->size;
2535 bed->s->swap_dyn_out (output_bfd, &dyn, dyncon);
2541 riscv_elf_finish_dynamic_sections (bfd *output_bfd,
2542 struct bfd_link_info *info)
2546 struct riscv_elf_link_hash_table *htab;
2548 htab = riscv_elf_hash_table (info);
2549 BFD_ASSERT (htab != NULL);
2550 dynobj = htab->elf.dynobj;
2552 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
2554 if (elf_hash_table (info)->dynamic_sections_created)
2559 splt = htab->elf.splt;
2560 BFD_ASSERT (splt != NULL && sdyn != NULL);
2562 ret = riscv_finish_dyn (output_bfd, info, dynobj, sdyn);
2567 /* Fill in the head and tail entries in the procedure linkage table. */
2571 uint32_t plt_header[PLT_HEADER_INSNS];
2572 ret = riscv_make_plt_header (output_bfd,
2573 sec_addr (htab->elf.sgotplt),
2574 sec_addr (splt), plt_header);
2578 for (i = 0; i < PLT_HEADER_INSNS; i++)
2579 bfd_put_32 (output_bfd, plt_header[i], splt->contents + 4*i);
2581 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2586 if (htab->elf.sgotplt)
2588 asection *output_section = htab->elf.sgotplt->output_section;
2590 if (bfd_is_abs_section (output_section))
2592 (*_bfd_error_handler)
2593 (_("discarded output section: `%pA'"), htab->elf.sgotplt);
2597 if (htab->elf.sgotplt->size > 0)
2599 /* Write the first two entries in .got.plt, needed for the dynamic
2601 bfd_put_NN (output_bfd, (bfd_vma) -1, htab->elf.sgotplt->contents);
2602 bfd_put_NN (output_bfd, (bfd_vma) 0,
2603 htab->elf.sgotplt->contents + GOT_ENTRY_SIZE);
2606 elf_section_data (output_section)->this_hdr.sh_entsize = GOT_ENTRY_SIZE;
2611 asection *output_section = htab->elf.sgot->output_section;
2613 if (htab->elf.sgot->size > 0)
2615 /* Set the first entry in the global offset table to the address of
2616 the dynamic section. */
2617 bfd_vma val = sdyn ? sec_addr (sdyn) : 0;
2618 bfd_put_NN (output_bfd, val, htab->elf.sgot->contents);
2621 elf_section_data (output_section)->this_hdr.sh_entsize = GOT_ENTRY_SIZE;
2627 /* Return address for Ith PLT stub in section PLT, for relocation REL
2628 or (bfd_vma) -1 if it should not be included. */
2631 riscv_elf_plt_sym_val (bfd_vma i, const asection *plt,
2632 const arelent *rel ATTRIBUTE_UNUSED)
2634 return plt->vma + PLT_HEADER_SIZE + i * PLT_ENTRY_SIZE;
2637 static enum elf_reloc_type_class
2638 riscv_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
2639 const asection *rel_sec ATTRIBUTE_UNUSED,
2640 const Elf_Internal_Rela *rela)
2642 switch (ELFNN_R_TYPE (rela->r_info))
2644 case R_RISCV_RELATIVE:
2645 return reloc_class_relative;
2646 case R_RISCV_JUMP_SLOT:
2647 return reloc_class_plt;
2649 return reloc_class_copy;
2651 return reloc_class_normal;
2655 /* Given the ELF header flags in FLAGS, it returns a string that describes the
2659 riscv_float_abi_string (flagword flags)
2661 switch (flags & EF_RISCV_FLOAT_ABI)
2663 case EF_RISCV_FLOAT_ABI_SOFT:
2664 return "soft-float";
2666 case EF_RISCV_FLOAT_ABI_SINGLE:
2667 return "single-float";
2669 case EF_RISCV_FLOAT_ABI_DOUBLE:
2670 return "double-float";
2672 case EF_RISCV_FLOAT_ABI_QUAD:
2673 return "quad-float";
2680 /* The information of architecture attribute. */
2681 static riscv_subset_list_t in_subsets;
2682 static riscv_subset_list_t out_subsets;
2683 static riscv_subset_list_t merged_subsets;
2685 /* Predicator for standard extension. */
2688 riscv_std_ext_p (const char *name)
2690 return (strlen (name) == 1) && (name[0] != 'x') && (name[0] != 's');
2693 /* Predicator for non-standard extension. */
2696 riscv_non_std_ext_p (const char *name)
2698 return (strlen (name) >= 2) && (name[0] == 'x');
2701 /* Predicator for standard supervisor extension. */
2704 riscv_std_sv_ext_p (const char *name)
2706 return (strlen (name) >= 2) && (name[0] == 's') && (name[1] != 'x');
2709 /* Predicator for non-standard supervisor extension. */
2712 riscv_non_std_sv_ext_p (const char *name)
2714 return (strlen (name) >= 3) && (name[0] == 's') && (name[1] == 'x');
2717 /* Error handler when version mis-match. */
2720 riscv_version_mismatch (bfd *ibfd,
2721 struct riscv_subset_t *in,
2722 struct riscv_subset_t *out)
2725 (_("error: %pB: Mis-matched ISA version for '%s' extension. "
2728 in->major_version, in->minor_version,
2729 out->major_version, out->minor_version);
2732 /* Return true if subset is 'i' or 'e'. */
2735 riscv_i_or_e_p (bfd *ibfd,
2737 struct riscv_subset_t *subset)
2739 if ((strcasecmp (subset->name, "e") != 0)
2740 && (strcasecmp (subset->name, "i") != 0))
2743 (_("error: %pB: corrupted ISA string '%s'. "
2744 "First letter should be 'i' or 'e' but got '%s'."),
2745 ibfd, arch, subset->name);
2751 /* Merge standard extensions.
2754 Return FALSE if failed to merge.
2758 `in_arch`: Raw arch string for input object.
2759 `out_arch`: Raw arch string for output object.
2760 `pin`: subset list for input object, and it'll skip all merged subset after
2762 `pout`: Like `pin`, but for output object. */
2765 riscv_merge_std_ext (bfd *ibfd,
2766 const char *in_arch,
2767 const char *out_arch,
2768 struct riscv_subset_t **pin,
2769 struct riscv_subset_t **pout)
2771 const char *standard_exts = riscv_supported_std_ext ();
2773 struct riscv_subset_t *in = *pin;
2774 struct riscv_subset_t *out = *pout;
2776 /* First letter should be 'i' or 'e'. */
2777 if (!riscv_i_or_e_p (ibfd, in_arch, in))
2780 if (!riscv_i_or_e_p (ibfd, out_arch, out))
2783 if (in->name[0] != out->name[0])
2785 /* TODO: We might allow merge 'i' with 'e'. */
2787 (_("error: %pB: Mis-matched ISA string to merge '%s' and '%s'."),
2788 ibfd, in->name, out->name);
2791 else if ((in->major_version != out->major_version) ||
2792 (in->minor_version != out->minor_version))
2794 /* TODO: Allow different merge policy. */
2795 riscv_version_mismatch (ibfd, in, out);
2799 riscv_add_subset (&merged_subsets,
2800 in->name, in->major_version, in->minor_version);
2805 /* Handle standard extension first. */
2806 for (p = standard_exts; *p; ++p)
2808 char find_ext[2] = {*p, '\0'};
2809 struct riscv_subset_t *find_in =
2810 riscv_lookup_subset (&in_subsets, find_ext);
2811 struct riscv_subset_t *find_out =
2812 riscv_lookup_subset (&out_subsets, find_ext);
2814 if (find_in == NULL && find_out == NULL)
2817 /* Check version is same or not. */
2818 /* TODO: Allow different merge policy. */
2819 if ((find_in != NULL && find_out != NULL)
2820 && ((find_in->major_version != find_out->major_version)
2821 || (find_in->minor_version != find_out->minor_version)))
2823 riscv_version_mismatch (ibfd, in, out);
2827 struct riscv_subset_t *merged = find_in ? find_in : find_out;
2828 riscv_add_subset (&merged_subsets, merged->name,
2829 merged->major_version, merged->minor_version);
2832 /* Skip all standard extensions. */
2833 while ((in != NULL) && riscv_std_ext_p (in->name)) in = in->next;
2834 while ((out != NULL) && riscv_std_ext_p (out->name)) out = out->next;
2842 /* Merge non-standard and supervisor extensions.
2844 Return FALSE if failed to merge.
2848 `in_arch`: Raw arch string for input object.
2849 `out_arch`: Raw arch string for output object.
2850 `pin`: subset list for input object, and it'll skip all merged subset after
2852 `pout`: Like `pin`, but for output object. */
2855 riscv_merge_non_std_and_sv_ext (bfd *ibfd,
2856 riscv_subset_t **pin,
2857 riscv_subset_t **pout,
2858 bfd_boolean (*predicate_func) (const char *))
2860 riscv_subset_t *in = *pin;
2861 riscv_subset_t *out = *pout;
2863 for (in = *pin; in != NULL && predicate_func (in->name); in = in->next)
2864 riscv_add_subset (&merged_subsets, in->name, in->major_version,
2867 for (out = *pout; out != NULL && predicate_func (out->name); out = out->next)
2869 riscv_subset_t *find_ext =
2870 riscv_lookup_subset (&merged_subsets, out->name);
2871 if (find_ext != NULL)
2873 /* Check version is same or not. */
2874 /* TODO: Allow different merge policy. */
2875 if ((find_ext->major_version != out->major_version)
2876 || (find_ext->minor_version != out->minor_version))
2878 riscv_version_mismatch (ibfd, find_ext, out);
2883 riscv_add_subset (&merged_subsets, out->name,
2884 out->major_version, out->minor_version);
2892 /* Merge Tag_RISCV_arch attribute. */
2895 riscv_merge_arch_attr_info (bfd *ibfd, char *in_arch, char *out_arch)
2897 riscv_subset_t *in, *out;
2898 char *merged_arch_str;
2900 unsigned xlen_in, xlen_out;
2901 merged_subsets.head = NULL;
2902 merged_subsets.tail = NULL;
2904 riscv_parse_subset_t rpe_in;
2905 riscv_parse_subset_t rpe_out;
2907 rpe_in.subset_list = &in_subsets;
2908 rpe_in.error_handler = _bfd_error_handler;
2909 rpe_in.xlen = &xlen_in;
2911 rpe_out.subset_list = &out_subsets;
2912 rpe_out.error_handler = _bfd_error_handler;
2913 rpe_out.xlen = &xlen_out;
2915 if (in_arch == NULL && out_arch == NULL)
2918 if (in_arch == NULL && out_arch != NULL)
2921 if (in_arch != NULL && out_arch == NULL)
2924 /* Parse subset from arch string. */
2925 if (!riscv_parse_subset (&rpe_in, in_arch))
2928 if (!riscv_parse_subset (&rpe_out, out_arch))
2931 /* Checking XLEN. */
2932 if (xlen_out != xlen_in)
2935 (_("error: %pB: ISA string of input (%s) doesn't match "
2936 "output (%s)."), ibfd, in_arch, out_arch);
2940 /* Merge subset list. */
2941 in = in_subsets.head;
2942 out = out_subsets.head;
2944 /* Merge standard extension. */
2945 if (!riscv_merge_std_ext (ibfd, in_arch, out_arch, &in, &out))
2947 /* Merge non-standard extension. */
2948 if (!riscv_merge_non_std_and_sv_ext (ibfd, &in, &out, riscv_non_std_ext_p))
2950 /* Merge standard supervisor extension. */
2951 if (!riscv_merge_non_std_and_sv_ext (ibfd, &in, &out, riscv_std_sv_ext_p))
2953 /* Merge non-standard supervisor extension. */
2954 if (!riscv_merge_non_std_and_sv_ext (ibfd, &in, &out, riscv_non_std_sv_ext_p))
2957 if (xlen_in != xlen_out)
2960 (_("error: %pB: XLEN of input (%u) doesn't match "
2961 "output (%u)."), ibfd, xlen_in, xlen_out);
2965 if (xlen_in != ARCH_SIZE)
2968 (_("error: %pB: Unsupported XLEN (%u), you might be "
2969 "using wrong emulation."), ibfd, xlen_in);
2973 merged_arch_str = riscv_arch_str (ARCH_SIZE, &merged_subsets);
2975 /* Release the subset lists. */
2976 riscv_release_subset_list (&in_subsets);
2977 riscv_release_subset_list (&out_subsets);
2978 riscv_release_subset_list (&merged_subsets);
2980 return merged_arch_str;
2983 /* Merge object attributes from IBFD into output_bfd of INFO.
2984 Raise an error if there are conflicting attributes. */
2987 riscv_merge_attributes (bfd *ibfd, struct bfd_link_info *info)
2989 bfd *obfd = info->output_bfd;
2990 obj_attribute *in_attr;
2991 obj_attribute *out_attr;
2992 bfd_boolean result = TRUE;
2993 const char *sec_name = get_elf_backend_data (ibfd)->obj_attrs_section;
2996 /* Skip linker created files. */
2997 if (ibfd->flags & BFD_LINKER_CREATED)
3000 /* Skip any input that doesn't have an attribute section.
3001 This enables to link object files without attribute section with
3003 if (bfd_get_section_by_name (ibfd, sec_name) == NULL)
3006 if (!elf_known_obj_attributes_proc (obfd)[0].i)
3008 /* This is the first object. Copy the attributes. */
3009 _bfd_elf_copy_obj_attributes (ibfd, obfd);
3011 out_attr = elf_known_obj_attributes_proc (obfd);
3013 /* Use the Tag_null value to indicate the attributes have been
3020 in_attr = elf_known_obj_attributes_proc (ibfd);
3021 out_attr = elf_known_obj_attributes_proc (obfd);
3023 for (i = LEAST_KNOWN_OBJ_ATTRIBUTE; i < NUM_KNOWN_OBJ_ATTRIBUTES; i++)
3027 case Tag_RISCV_arch:
3028 if (!out_attr[Tag_RISCV_arch].s)
3029 out_attr[Tag_RISCV_arch].s = in_attr[Tag_RISCV_arch].s;
3030 else if (in_attr[Tag_RISCV_arch].s
3031 && out_attr[Tag_RISCV_arch].s)
3033 /* Check arch compatible. */
3035 riscv_merge_arch_attr_info (ibfd,
3036 in_attr[Tag_RISCV_arch].s,
3037 out_attr[Tag_RISCV_arch].s);
3038 if (merged_arch == NULL)
3041 out_attr[Tag_RISCV_arch].s = "";
3044 out_attr[Tag_RISCV_arch].s = merged_arch;
3047 case Tag_RISCV_priv_spec:
3048 case Tag_RISCV_priv_spec_minor:
3049 case Tag_RISCV_priv_spec_revision:
3050 if (out_attr[i].i != in_attr[i].i)
3053 (_("error: %pB: conflicting priv spec version "
3054 "(major/minor/revision)."), ibfd);
3058 case Tag_RISCV_unaligned_access:
3059 out_attr[i].i |= in_attr[i].i;
3061 case Tag_RISCV_stack_align:
3062 if (out_attr[i].i == 0)
3063 out_attr[i].i = in_attr[i].i;
3064 else if (in_attr[i].i != 0
3065 && out_attr[i].i != 0
3066 && out_attr[i].i != in_attr[i].i)
3069 (_("error: %pB use %u-byte stack aligned but the output "
3070 "use %u-byte stack aligned."),
3071 ibfd, in_attr[i].i, out_attr[i].i);
3076 result &= _bfd_elf_merge_unknown_attribute_low (ibfd, obfd, i);
3079 /* If out_attr was copied from in_attr then it won't have a type yet. */
3080 if (in_attr[i].type && !out_attr[i].type)
3081 out_attr[i].type = in_attr[i].type;
3084 /* Merge Tag_compatibility attributes and any common GNU ones. */
3085 if (!_bfd_elf_merge_object_attributes (ibfd, info))
3088 /* Check for any attributes not known on RISC-V. */
3089 result &= _bfd_elf_merge_unknown_attribute_list (ibfd, obfd);
3094 /* Merge backend specific data from an object file to the output
3095 object file when linking. */
3098 _bfd_riscv_elf_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
3100 bfd *obfd = info->output_bfd;
3101 flagword new_flags, old_flags;
3103 if (!is_riscv_elf (ibfd) || !is_riscv_elf (obfd))
3106 if (strcmp (bfd_get_target (ibfd), bfd_get_target (obfd)) != 0)
3108 (*_bfd_error_handler)
3109 (_("%pB: ABI is incompatible with that of the selected emulation:\n"
3110 " target emulation `%s' does not match `%s'"),
3111 ibfd, bfd_get_target (ibfd), bfd_get_target (obfd));
3115 if (!_bfd_elf_merge_object_attributes (ibfd, info))
3118 if (!riscv_merge_attributes (ibfd, info))
3121 new_flags = elf_elfheader (ibfd)->e_flags;
3122 old_flags = elf_elfheader (obfd)->e_flags;
3124 if (! elf_flags_init (obfd))
3126 elf_flags_init (obfd) = TRUE;
3127 elf_elfheader (obfd)->e_flags = new_flags;
3131 /* Check to see if the input BFD actually contains any sections. If not,
3132 its flags may not have been initialized either, but it cannot actually
3133 cause any incompatibility. Do not short-circuit dynamic objects; their
3134 section list may be emptied by elf_link_add_object_symbols.
3136 Also check to see if there are no code sections in the input. In this
3137 case, there is no need to check for code specific flags. */
3138 if (!(ibfd->flags & DYNAMIC))
3140 bfd_boolean null_input_bfd = TRUE;
3141 bfd_boolean only_data_sections = TRUE;
3144 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
3146 if ((bfd_get_section_flags (ibfd, sec)
3147 & (SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS))
3148 == (SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS))
3149 only_data_sections = FALSE;
3151 null_input_bfd = FALSE;
3155 if (null_input_bfd || only_data_sections)
3159 /* Disallow linking different float ABIs. */
3160 if ((old_flags ^ new_flags) & EF_RISCV_FLOAT_ABI)
3162 (*_bfd_error_handler)
3163 (_("%pB: can't link %s modules with %s modules"), ibfd,
3164 riscv_float_abi_string (new_flags),
3165 riscv_float_abi_string (old_flags));
3169 /* Disallow linking RVE and non-RVE. */
3170 if ((old_flags ^ new_flags) & EF_RISCV_RVE)
3172 (*_bfd_error_handler)
3173 (_("%pB: can't link RVE with other target"), ibfd);
3177 /* Allow linking RVC and non-RVC, and keep the RVC flag. */
3178 elf_elfheader (obfd)->e_flags |= new_flags & EF_RISCV_RVC;
3183 bfd_set_error (bfd_error_bad_value);
3187 /* Delete some bytes from a section while relaxing. */
3190 riscv_relax_delete_bytes (bfd *abfd, asection *sec, bfd_vma addr, size_t count,
3191 struct bfd_link_info *link_info)
3193 unsigned int i, symcount;
3194 bfd_vma toaddr = sec->size;
3195 struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (abfd);
3196 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
3197 unsigned int sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
3198 struct bfd_elf_section_data *data = elf_section_data (sec);
3199 bfd_byte *contents = data->this_hdr.contents;
3201 /* Actually delete the bytes. */
3203 memmove (contents + addr, contents + addr + count, toaddr - addr - count);
3205 /* Adjust the location of all of the relocs. Note that we need not
3206 adjust the addends, since all PC-relative references must be against
3207 symbols, which we will adjust below. */
3208 for (i = 0; i < sec->reloc_count; i++)
3209 if (data->relocs[i].r_offset > addr && data->relocs[i].r_offset < toaddr)
3210 data->relocs[i].r_offset -= count;
3212 /* Adjust the local symbols defined in this section. */
3213 for (i = 0; i < symtab_hdr->sh_info; i++)
3215 Elf_Internal_Sym *sym = (Elf_Internal_Sym *) symtab_hdr->contents + i;
3216 if (sym->st_shndx == sec_shndx)
3218 /* If the symbol is in the range of memory we just moved, we
3219 have to adjust its value. */
3220 if (sym->st_value > addr && sym->st_value <= toaddr)
3221 sym->st_value -= count;
3223 /* If the symbol *spans* the bytes we just deleted (i.e. its
3224 *end* is in the moved bytes but its *start* isn't), then we
3225 must adjust its size.
3227 This test needs to use the original value of st_value, otherwise
3228 we might accidentally decrease size when deleting bytes right
3229 before the symbol. But since deleted relocs can't span across
3230 symbols, we can't have both a st_value and a st_size decrease,
3231 so it is simpler to just use an else. */
3232 else if (sym->st_value <= addr
3233 && sym->st_value + sym->st_size > addr
3234 && sym->st_value + sym->st_size <= toaddr)
3235 sym->st_size -= count;
3239 /* Now adjust the global symbols defined in this section. */
3240 symcount = ((symtab_hdr->sh_size / sizeof (ElfNN_External_Sym))
3241 - symtab_hdr->sh_info);
3243 for (i = 0; i < symcount; i++)
3245 struct elf_link_hash_entry *sym_hash = sym_hashes[i];
3247 /* The '--wrap SYMBOL' option is causing a pain when the object file,
3248 containing the definition of __wrap_SYMBOL, includes a direct
3249 call to SYMBOL as well. Since both __wrap_SYMBOL and SYMBOL reference
3250 the same symbol (which is __wrap_SYMBOL), but still exist as two
3251 different symbols in 'sym_hashes', we don't want to adjust
3252 the global symbol __wrap_SYMBOL twice. */
3253 /* The same problem occurs with symbols that are versioned_hidden, as
3254 foo becomes an alias for foo@BAR, and hence they need the same
3256 if (link_info->wrap_hash != NULL
3257 || sym_hash->versioned == versioned_hidden)
3259 struct elf_link_hash_entry **cur_sym_hashes;
3261 /* Loop only over the symbols which have already been checked. */
3262 for (cur_sym_hashes = sym_hashes; cur_sym_hashes < &sym_hashes[i];
3265 /* If the current symbol is identical to 'sym_hash', that means
3266 the symbol was already adjusted (or at least checked). */
3267 if (*cur_sym_hashes == sym_hash)
3270 /* Don't adjust the symbol again. */
3271 if (cur_sym_hashes < &sym_hashes[i])
3275 if ((sym_hash->root.type == bfd_link_hash_defined
3276 || sym_hash->root.type == bfd_link_hash_defweak)
3277 && sym_hash->root.u.def.section == sec)
3279 /* As above, adjust the value if needed. */
3280 if (sym_hash->root.u.def.value > addr
3281 && sym_hash->root.u.def.value <= toaddr)
3282 sym_hash->root.u.def.value -= count;
3284 /* As above, adjust the size if needed. */
3285 else if (sym_hash->root.u.def.value <= addr
3286 && sym_hash->root.u.def.value + sym_hash->size > addr
3287 && sym_hash->root.u.def.value + sym_hash->size <= toaddr)
3288 sym_hash->size -= count;
3295 /* A second format for recording PC-relative hi relocations. This stores the
3296 information required to relax them to GP-relative addresses. */
3298 typedef struct riscv_pcgp_hi_reloc riscv_pcgp_hi_reloc;
3299 struct riscv_pcgp_hi_reloc
3306 riscv_pcgp_hi_reloc *next;
3309 typedef struct riscv_pcgp_lo_reloc riscv_pcgp_lo_reloc;
3310 struct riscv_pcgp_lo_reloc
3313 riscv_pcgp_lo_reloc *next;
3318 riscv_pcgp_hi_reloc *hi;
3319 riscv_pcgp_lo_reloc *lo;
3320 } riscv_pcgp_relocs;
3322 /* Initialize the pcgp reloc info in P. */
3325 riscv_init_pcgp_relocs (riscv_pcgp_relocs *p)
3332 /* Free the pcgp reloc info in P. */
3335 riscv_free_pcgp_relocs (riscv_pcgp_relocs *p,
3336 bfd *abfd ATTRIBUTE_UNUSED,
3337 asection *sec ATTRIBUTE_UNUSED)
3339 riscv_pcgp_hi_reloc *c;
3340 riscv_pcgp_lo_reloc *l;
3342 for (c = p->hi; c != NULL;)
3344 riscv_pcgp_hi_reloc *next = c->next;
3349 for (l = p->lo; l != NULL;)
3351 riscv_pcgp_lo_reloc *next = l->next;
3357 /* Record pcgp hi part reloc info in P, using HI_SEC_OFF as the lookup index.
3358 The HI_ADDEND, HI_ADDR, HI_SYM, and SYM_SEC args contain info required to
3359 relax the corresponding lo part reloc. */
3362 riscv_record_pcgp_hi_reloc (riscv_pcgp_relocs *p, bfd_vma hi_sec_off,
3363 bfd_vma hi_addend, bfd_vma hi_addr,
3364 unsigned hi_sym, asection *sym_sec)
3366 riscv_pcgp_hi_reloc *new = bfd_malloc (sizeof(*new));
3369 new->hi_sec_off = hi_sec_off;
3370 new->hi_addend = hi_addend;
3371 new->hi_addr = hi_addr;
3372 new->hi_sym = hi_sym;
3373 new->sym_sec = sym_sec;
3379 /* Look up hi part pcgp reloc info in P, using HI_SEC_OFF as the lookup index.
3380 This is used by a lo part reloc to find the corresponding hi part reloc. */
3382 static riscv_pcgp_hi_reloc *
3383 riscv_find_pcgp_hi_reloc(riscv_pcgp_relocs *p, bfd_vma hi_sec_off)
3385 riscv_pcgp_hi_reloc *c;
3387 for (c = p->hi; c != NULL; c = c->next)
3388 if (c->hi_sec_off == hi_sec_off)
3393 /* Record pcgp lo part reloc info in P, using HI_SEC_OFF as the lookup info.
3394 This is used to record relocs that can't be relaxed. */
3397 riscv_record_pcgp_lo_reloc (riscv_pcgp_relocs *p, bfd_vma hi_sec_off)
3399 riscv_pcgp_lo_reloc *new = bfd_malloc (sizeof(*new));
3402 new->hi_sec_off = hi_sec_off;
3408 /* Look up lo part pcgp reloc info in P, using HI_SEC_OFF as the lookup index.
3409 This is used by a hi part reloc to find the corresponding lo part reloc. */
3412 riscv_find_pcgp_lo_reloc (riscv_pcgp_relocs *p, bfd_vma hi_sec_off)
3414 riscv_pcgp_lo_reloc *c;
3416 for (c = p->lo; c != NULL; c = c->next)
3417 if (c->hi_sec_off == hi_sec_off)
3422 typedef bfd_boolean (*relax_func_t) (bfd *, asection *, asection *,
3423 struct bfd_link_info *,
3424 Elf_Internal_Rela *,
3425 bfd_vma, bfd_vma, bfd_vma, bfd_boolean *,
3426 riscv_pcgp_relocs *);
3428 /* Relax AUIPC + JALR into JAL. */
3431 _bfd_riscv_relax_call (bfd *abfd, asection *sec, asection *sym_sec,
3432 struct bfd_link_info *link_info,
3433 Elf_Internal_Rela *rel,
3435 bfd_vma max_alignment,
3436 bfd_vma reserve_size ATTRIBUTE_UNUSED,
3438 riscv_pcgp_relocs *pcgp_relocs ATTRIBUTE_UNUSED)
3440 bfd_byte *contents = elf_section_data (sec)->this_hdr.contents;
3441 bfd_signed_vma foff = symval - (sec_addr (sec) + rel->r_offset);
3442 bfd_boolean near_zero = (symval + RISCV_IMM_REACH/2) < RISCV_IMM_REACH;
3443 bfd_vma auipc, jalr;
3444 int rd, r_type, len = 4, rvc = elf_elfheader (abfd)->e_flags & EF_RISCV_RVC;
3446 /* If the call crosses section boundaries, an alignment directive could
3447 cause the PC-relative offset to later increase. */
3448 if (VALID_UJTYPE_IMM (foff) && sym_sec->output_section != sec->output_section)
3449 foff += (foff < 0 ? -max_alignment : max_alignment);
3451 /* See if this function call can be shortened. */
3452 if (!VALID_UJTYPE_IMM (foff) && !(!bfd_link_pic (link_info) && near_zero))
3455 /* Shorten the function call. */
3456 BFD_ASSERT (rel->r_offset + 8 <= sec->size);
3458 auipc = bfd_get_32 (abfd, contents + rel->r_offset);
3459 jalr = bfd_get_32 (abfd, contents + rel->r_offset + 4);
3460 rd = (jalr >> OP_SH_RD) & OP_MASK_RD;
3461 rvc = rvc && VALID_RVC_J_IMM (foff);
3463 /* C.J exists on RV32 and RV64, but C.JAL is RV32-only. */
3464 rvc = rvc && (rd == 0 || (rd == X_RA && ARCH_SIZE == 32));
3468 /* Relax to C.J[AL] rd, addr. */
3469 r_type = R_RISCV_RVC_JUMP;
3470 auipc = rd == 0 ? MATCH_C_J : MATCH_C_JAL;
3473 else if (VALID_UJTYPE_IMM (foff))
3475 /* Relax to JAL rd, addr. */
3476 r_type = R_RISCV_JAL;
3477 auipc = MATCH_JAL | (rd << OP_SH_RD);
3479 else /* near_zero */
3481 /* Relax to JALR rd, x0, addr. */
3482 r_type = R_RISCV_LO12_I;
3483 auipc = MATCH_JALR | (rd << OP_SH_RD);
3486 /* Replace the R_RISCV_CALL reloc. */
3487 rel->r_info = ELFNN_R_INFO (ELFNN_R_SYM (rel->r_info), r_type);
3488 /* Replace the AUIPC. */
3489 bfd_put (8 * len, abfd, auipc, contents + rel->r_offset);
3491 /* Delete unnecessary JALR. */
3493 return riscv_relax_delete_bytes (abfd, sec, rel->r_offset + len, 8 - len,
3497 /* Traverse all output sections and return the max alignment. */
3500 _bfd_riscv_get_max_alignment (asection *sec)
3502 unsigned int max_alignment_power = 0;
3505 for (o = sec->output_section->owner->sections; o != NULL; o = o->next)
3507 if (o->alignment_power > max_alignment_power)
3508 max_alignment_power = o->alignment_power;
3511 return (bfd_vma) 1 << max_alignment_power;
3514 /* Relax non-PIC global variable references. */
3517 _bfd_riscv_relax_lui (bfd *abfd,
3520 struct bfd_link_info *link_info,
3521 Elf_Internal_Rela *rel,
3523 bfd_vma max_alignment,
3524 bfd_vma reserve_size,
3526 riscv_pcgp_relocs *pcgp_relocs ATTRIBUTE_UNUSED)
3528 bfd_byte *contents = elf_section_data (sec)->this_hdr.contents;
3529 bfd_vma gp = riscv_global_pointer_value (link_info);
3530 int use_rvc = elf_elfheader (abfd)->e_flags & EF_RISCV_RVC;
3532 BFD_ASSERT (rel->r_offset + 4 <= sec->size);
3536 /* If gp and the symbol are in the same output section, which is not the
3537 abs section, then consider only that output section's alignment. */
3538 struct bfd_link_hash_entry *h =
3539 bfd_link_hash_lookup (link_info->hash, RISCV_GP_SYMBOL, FALSE, FALSE,
3541 if (h->u.def.section->output_section == sym_sec->output_section
3542 && sym_sec->output_section != bfd_abs_section_ptr)
3543 max_alignment = (bfd_vma) 1 << sym_sec->output_section->alignment_power;
3546 /* Is the reference in range of x0 or gp?
3547 Valid gp range conservatively because of alignment issue. */
3548 if (VALID_ITYPE_IMM (symval)
3550 && VALID_ITYPE_IMM (symval - gp + max_alignment + reserve_size))
3552 && VALID_ITYPE_IMM (symval - gp - max_alignment - reserve_size)))
3554 unsigned sym = ELFNN_R_SYM (rel->r_info);
3555 switch (ELFNN_R_TYPE (rel->r_info))
3557 case R_RISCV_LO12_I:
3558 rel->r_info = ELFNN_R_INFO (sym, R_RISCV_GPREL_I);
3561 case R_RISCV_LO12_S:
3562 rel->r_info = ELFNN_R_INFO (sym, R_RISCV_GPREL_S);
3566 /* We can delete the unnecessary LUI and reloc. */
3567 rel->r_info = ELFNN_R_INFO (0, R_RISCV_NONE);
3569 return riscv_relax_delete_bytes (abfd, sec, rel->r_offset, 4,
3577 /* Can we relax LUI to C.LUI? Alignment might move the section forward;
3578 account for this assuming page alignment at worst. In the presence of
3579 RELRO segment the linker aligns it by one page size, therefore sections
3580 after the segment can be moved more than one page. */
3583 && ELFNN_R_TYPE (rel->r_info) == R_RISCV_HI20
3584 && VALID_RVC_LUI_IMM (RISCV_CONST_HIGH_PART (symval))
3585 && VALID_RVC_LUI_IMM (RISCV_CONST_HIGH_PART (symval)
3586 + (link_info->relro ? 2 * ELF_MAXPAGESIZE
3587 : ELF_MAXPAGESIZE)))
3589 /* Replace LUI with C.LUI if legal (i.e., rd != x0 and rd != x2/sp). */
3590 bfd_vma lui = bfd_get_32 (abfd, contents + rel->r_offset);
3591 unsigned rd = ((unsigned)lui >> OP_SH_RD) & OP_MASK_RD;
3592 if (rd == 0 || rd == X_SP)
3595 lui = (lui & (OP_MASK_RD << OP_SH_RD)) | MATCH_C_LUI;
3596 bfd_put_32 (abfd, lui, contents + rel->r_offset);
3598 /* Replace the R_RISCV_HI20 reloc. */
3599 rel->r_info = ELFNN_R_INFO (ELFNN_R_SYM (rel->r_info), R_RISCV_RVC_LUI);
3602 return riscv_relax_delete_bytes (abfd, sec, rel->r_offset + 2, 2,
3609 /* Relax non-PIC TLS references. */
3612 _bfd_riscv_relax_tls_le (bfd *abfd,
3614 asection *sym_sec ATTRIBUTE_UNUSED,
3615 struct bfd_link_info *link_info,
3616 Elf_Internal_Rela *rel,
3618 bfd_vma max_alignment ATTRIBUTE_UNUSED,
3619 bfd_vma reserve_size ATTRIBUTE_UNUSED,
3621 riscv_pcgp_relocs *prcel_relocs ATTRIBUTE_UNUSED)
3623 /* See if this symbol is in range of tp. */
3624 if (RISCV_CONST_HIGH_PART (tpoff (link_info, symval)) != 0)
3627 BFD_ASSERT (rel->r_offset + 4 <= sec->size);
3628 switch (ELFNN_R_TYPE (rel->r_info))
3630 case R_RISCV_TPREL_LO12_I:
3631 rel->r_info = ELFNN_R_INFO (ELFNN_R_SYM (rel->r_info), R_RISCV_TPREL_I);
3634 case R_RISCV_TPREL_LO12_S:
3635 rel->r_info = ELFNN_R_INFO (ELFNN_R_SYM (rel->r_info), R_RISCV_TPREL_S);
3638 case R_RISCV_TPREL_HI20:
3639 case R_RISCV_TPREL_ADD:
3640 /* We can delete the unnecessary instruction and reloc. */
3641 rel->r_info = ELFNN_R_INFO (0, R_RISCV_NONE);
3643 return riscv_relax_delete_bytes (abfd, sec, rel->r_offset, 4, link_info);
3650 /* Implement R_RISCV_ALIGN by deleting excess alignment NOPs. */
3653 _bfd_riscv_relax_align (bfd *abfd, asection *sec,
3655 struct bfd_link_info *link_info,
3656 Elf_Internal_Rela *rel,
3658 bfd_vma max_alignment ATTRIBUTE_UNUSED,
3659 bfd_vma reserve_size ATTRIBUTE_UNUSED,
3660 bfd_boolean *again ATTRIBUTE_UNUSED,
3661 riscv_pcgp_relocs *pcrel_relocs ATTRIBUTE_UNUSED)
3663 bfd_byte *contents = elf_section_data (sec)->this_hdr.contents;
3664 bfd_vma alignment = 1, pos;
3665 while (alignment <= rel->r_addend)
3668 symval -= rel->r_addend;
3669 bfd_vma aligned_addr = ((symval - 1) & ~(alignment - 1)) + alignment;
3670 bfd_vma nop_bytes = aligned_addr - symval;
3672 /* Once we've handled an R_RISCV_ALIGN, we can't relax anything else. */
3673 sec->sec_flg0 = TRUE;
3675 /* Make sure there are enough NOPs to actually achieve the alignment. */
3676 if (rel->r_addend < nop_bytes)
3679 (_("%pB(%pA+%#" PRIx64 "): %" PRId64 " bytes required for alignment "
3680 "to %" PRId64 "-byte boundary, but only %" PRId64 " present"),
3681 abfd, sym_sec, (uint64_t) rel->r_offset,
3682 (int64_t) nop_bytes, (int64_t) alignment, (int64_t) rel->r_addend);
3683 bfd_set_error (bfd_error_bad_value);
3687 /* Delete the reloc. */
3688 rel->r_info = ELFNN_R_INFO (0, R_RISCV_NONE);
3690 /* If the number of NOPs is already correct, there's nothing to do. */
3691 if (nop_bytes == rel->r_addend)
3694 /* Write as many RISC-V NOPs as we need. */
3695 for (pos = 0; pos < (nop_bytes & -4); pos += 4)
3696 bfd_put_32 (abfd, RISCV_NOP, contents + rel->r_offset + pos);
3698 /* Write a final RVC NOP if need be. */
3699 if (nop_bytes % 4 != 0)
3700 bfd_put_16 (abfd, RVC_NOP, contents + rel->r_offset + pos);
3702 /* Delete the excess bytes. */
3703 return riscv_relax_delete_bytes (abfd, sec, rel->r_offset + nop_bytes,
3704 rel->r_addend - nop_bytes, link_info);
3707 /* Relax PC-relative references to GP-relative references. */
3710 _bfd_riscv_relax_pc (bfd *abfd ATTRIBUTE_UNUSED,
3713 struct bfd_link_info *link_info,
3714 Elf_Internal_Rela *rel,
3716 bfd_vma max_alignment,
3717 bfd_vma reserve_size,
3718 bfd_boolean *again ATTRIBUTE_UNUSED,
3719 riscv_pcgp_relocs *pcgp_relocs)
3721 bfd_vma gp = riscv_global_pointer_value (link_info);
3723 BFD_ASSERT (rel->r_offset + 4 <= sec->size);
3725 /* Chain the _LO relocs to their cooresponding _HI reloc to compute the
3726 * actual target address. */
3727 riscv_pcgp_hi_reloc hi_reloc;
3728 memset (&hi_reloc, 0, sizeof (hi_reloc));
3729 switch (ELFNN_R_TYPE (rel->r_info))
3731 case R_RISCV_PCREL_LO12_I:
3732 case R_RISCV_PCREL_LO12_S:
3734 /* If the %lo has an addend, it isn't for the label pointing at the
3735 hi part instruction, but rather for the symbol pointed at by the
3736 hi part instruction. So we must subtract it here for the lookup.
3737 It is still used below in the final symbol address. */
3738 bfd_vma hi_sec_off = symval - sec_addr (sym_sec) - rel->r_addend;
3739 riscv_pcgp_hi_reloc *hi = riscv_find_pcgp_hi_reloc (pcgp_relocs,
3743 riscv_record_pcgp_lo_reloc (pcgp_relocs, hi_sec_off);
3748 symval = hi_reloc.hi_addr;
3749 sym_sec = hi_reloc.sym_sec;
3753 case R_RISCV_PCREL_HI20:
3754 /* Mergeable symbols and code might later move out of range. */
3755 if (sym_sec->flags & (SEC_MERGE | SEC_CODE))
3758 /* If the cooresponding lo relocation has already been seen then it's not
3759 * safe to relax this relocation. */
3760 if (riscv_find_pcgp_lo_reloc (pcgp_relocs, rel->r_offset))
3771 /* If gp and the symbol are in the same output section, which is not the
3772 abs section, then consider only that output section's alignment. */
3773 struct bfd_link_hash_entry *h =
3774 bfd_link_hash_lookup (link_info->hash, RISCV_GP_SYMBOL, FALSE, FALSE,
3776 if (h->u.def.section->output_section == sym_sec->output_section
3777 && sym_sec->output_section != bfd_abs_section_ptr)
3778 max_alignment = (bfd_vma) 1 << sym_sec->output_section->alignment_power;
3781 /* Is the reference in range of x0 or gp?
3782 Valid gp range conservatively because of alignment issue. */
3783 if (VALID_ITYPE_IMM (symval)
3785 && VALID_ITYPE_IMM (symval - gp + max_alignment + reserve_size))
3787 && VALID_ITYPE_IMM (symval - gp - max_alignment - reserve_size)))
3789 unsigned sym = hi_reloc.hi_sym;
3790 switch (ELFNN_R_TYPE (rel->r_info))
3792 case R_RISCV_PCREL_LO12_I:
3793 rel->r_info = ELFNN_R_INFO (sym, R_RISCV_GPREL_I);
3794 rel->r_addend += hi_reloc.hi_addend;
3797 case R_RISCV_PCREL_LO12_S:
3798 rel->r_info = ELFNN_R_INFO (sym, R_RISCV_GPREL_S);
3799 rel->r_addend += hi_reloc.hi_addend;
3802 case R_RISCV_PCREL_HI20:
3803 riscv_record_pcgp_hi_reloc (pcgp_relocs,
3807 ELFNN_R_SYM(rel->r_info),
3809 /* We can delete the unnecessary AUIPC and reloc. */
3810 rel->r_info = ELFNN_R_INFO (0, R_RISCV_DELETE);
3822 /* Relax PC-relative references to GP-relative references. */
3825 _bfd_riscv_relax_delete (bfd *abfd,
3827 asection *sym_sec ATTRIBUTE_UNUSED,
3828 struct bfd_link_info *link_info,
3829 Elf_Internal_Rela *rel,
3830 bfd_vma symval ATTRIBUTE_UNUSED,
3831 bfd_vma max_alignment ATTRIBUTE_UNUSED,
3832 bfd_vma reserve_size ATTRIBUTE_UNUSED,
3833 bfd_boolean *again ATTRIBUTE_UNUSED,
3834 riscv_pcgp_relocs *pcgp_relocs ATTRIBUTE_UNUSED)
3836 if (!riscv_relax_delete_bytes(abfd, sec, rel->r_offset, rel->r_addend,
3839 rel->r_info = ELFNN_R_INFO(0, R_RISCV_NONE);
3843 /* Relax a section. Pass 0 shortens code sequences unless disabled. Pass 1
3844 deletes the bytes that pass 0 made obselete. Pass 2, which cannot be
3845 disabled, handles code alignment directives. */
3848 _bfd_riscv_relax_section (bfd *abfd, asection *sec,
3849 struct bfd_link_info *info,
3852 Elf_Internal_Shdr *symtab_hdr = &elf_symtab_hdr (abfd);
3853 struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info);
3854 struct bfd_elf_section_data *data = elf_section_data (sec);
3855 Elf_Internal_Rela *relocs;
3856 bfd_boolean ret = FALSE;
3858 bfd_vma max_alignment, reserve_size = 0;
3859 riscv_pcgp_relocs pcgp_relocs;
3863 if (bfd_link_relocatable (info)
3865 || (sec->flags & SEC_RELOC) == 0
3866 || sec->reloc_count == 0
3867 || (info->disable_target_specific_optimizations
3868 && info->relax_pass == 0))
3871 riscv_init_pcgp_relocs (&pcgp_relocs);
3873 /* Read this BFD's relocs if we haven't done so already. */
3875 relocs = data->relocs;
3876 else if (!(relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL,
3877 info->keep_memory)))
3882 max_alignment = htab->max_alignment;
3883 if (max_alignment == (bfd_vma) -1)
3885 max_alignment = _bfd_riscv_get_max_alignment (sec);
3886 htab->max_alignment = max_alignment;
3890 max_alignment = _bfd_riscv_get_max_alignment (sec);
3892 /* Examine and consider relaxing each reloc. */
3893 for (i = 0; i < sec->reloc_count; i++)
3896 Elf_Internal_Rela *rel = relocs + i;
3897 relax_func_t relax_func;
3898 int type = ELFNN_R_TYPE (rel->r_info);
3903 if (info->relax_pass == 0)
3905 if (type == R_RISCV_CALL || type == R_RISCV_CALL_PLT)
3906 relax_func = _bfd_riscv_relax_call;
3907 else if (type == R_RISCV_HI20
3908 || type == R_RISCV_LO12_I
3909 || type == R_RISCV_LO12_S)
3910 relax_func = _bfd_riscv_relax_lui;
3911 else if (!bfd_link_pic(info)
3912 && (type == R_RISCV_PCREL_HI20
3913 || type == R_RISCV_PCREL_LO12_I
3914 || type == R_RISCV_PCREL_LO12_S))
3915 relax_func = _bfd_riscv_relax_pc;
3916 else if (type == R_RISCV_TPREL_HI20
3917 || type == R_RISCV_TPREL_ADD
3918 || type == R_RISCV_TPREL_LO12_I
3919 || type == R_RISCV_TPREL_LO12_S)
3920 relax_func = _bfd_riscv_relax_tls_le;
3924 /* Only relax this reloc if it is paired with R_RISCV_RELAX. */
3925 if (i == sec->reloc_count - 1
3926 || ELFNN_R_TYPE ((rel + 1)->r_info) != R_RISCV_RELAX
3927 || rel->r_offset != (rel + 1)->r_offset)
3930 /* Skip over the R_RISCV_RELAX. */
3933 else if (info->relax_pass == 1 && type == R_RISCV_DELETE)
3934 relax_func = _bfd_riscv_relax_delete;
3935 else if (info->relax_pass == 2 && type == R_RISCV_ALIGN)
3936 relax_func = _bfd_riscv_relax_align;
3940 data->relocs = relocs;
3942 /* Read this BFD's contents if we haven't done so already. */
3943 if (!data->this_hdr.contents
3944 && !bfd_malloc_and_get_section (abfd, sec, &data->this_hdr.contents))
3947 /* Read this BFD's symbols if we haven't done so already. */
3948 if (symtab_hdr->sh_info != 0
3949 && !symtab_hdr->contents
3950 && !(symtab_hdr->contents =
3951 (unsigned char *) bfd_elf_get_elf_syms (abfd, symtab_hdr,
3952 symtab_hdr->sh_info,
3953 0, NULL, NULL, NULL)))
3956 /* Get the value of the symbol referred to by the reloc. */
3957 if (ELFNN_R_SYM (rel->r_info) < symtab_hdr->sh_info)
3959 /* A local symbol. */
3960 Elf_Internal_Sym *isym = ((Elf_Internal_Sym *) symtab_hdr->contents
3961 + ELFNN_R_SYM (rel->r_info));
3962 reserve_size = (isym->st_size - rel->r_addend) > isym->st_size
3963 ? 0 : isym->st_size - rel->r_addend;
3965 if (isym->st_shndx == SHN_UNDEF)
3966 sym_sec = sec, symval = rel->r_offset;
3969 BFD_ASSERT (isym->st_shndx < elf_numsections (abfd));
3970 sym_sec = elf_elfsections (abfd)[isym->st_shndx]->bfd_section;
3972 /* The purpose of this code is unknown. It breaks linker scripts
3973 for embedded development that place sections at address zero.
3974 This code is believed to be unnecessary. Disabling it but not
3975 yet removing it, in case something breaks. */
3976 if (sec_addr (sym_sec) == 0)
3979 symval = isym->st_value;
3981 symtype = ELF_ST_TYPE (isym->st_info);
3986 struct elf_link_hash_entry *h;
3988 indx = ELFNN_R_SYM (rel->r_info) - symtab_hdr->sh_info;
3989 h = elf_sym_hashes (abfd)[indx];
3991 while (h->root.type == bfd_link_hash_indirect
3992 || h->root.type == bfd_link_hash_warning)
3993 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3995 if (h->plt.offset != MINUS_ONE)
3997 sym_sec = htab->elf.splt;
3998 symval = h->plt.offset;
4000 else if (h->root.u.def.section->output_section == NULL
4001 || (h->root.type != bfd_link_hash_defined
4002 && h->root.type != bfd_link_hash_defweak))
4006 symval = h->root.u.def.value;
4007 sym_sec = h->root.u.def.section;
4010 if (h->type != STT_FUNC)
4012 (h->size - rel->r_addend) > h->size ? 0 : h->size - rel->r_addend;
4016 if (sym_sec->sec_info_type == SEC_INFO_TYPE_MERGE
4017 && (sym_sec->flags & SEC_MERGE))
4019 /* At this stage in linking, no SEC_MERGE symbol has been
4020 adjusted, so all references to such symbols need to be
4021 passed through _bfd_merged_section_offset. (Later, in
4022 relocate_section, all SEC_MERGE symbols *except* for
4023 section symbols have been adjusted.)
4025 gas may reduce relocations against symbols in SEC_MERGE
4026 sections to a relocation against the section symbol when
4027 the original addend was zero. When the reloc is against
4028 a section symbol we should include the addend in the
4029 offset passed to _bfd_merged_section_offset, since the
4030 location of interest is the original symbol. On the
4031 other hand, an access to "sym+addend" where "sym" is not
4032 a section symbol should not include the addend; Such an
4033 access is presumed to be an offset from "sym"; The
4034 location of interest is just "sym". */
4035 if (symtype == STT_SECTION)
4036 symval += rel->r_addend;
4038 symval = _bfd_merged_section_offset (abfd, &sym_sec,
4039 elf_section_data (sym_sec)->sec_info,
4042 if (symtype != STT_SECTION)
4043 symval += rel->r_addend;
4046 symval += rel->r_addend;
4048 symval += sec_addr (sym_sec);
4050 if (!relax_func (abfd, sec, sym_sec, info, rel, symval,
4051 max_alignment, reserve_size, again,
4059 if (relocs != data->relocs)
4061 riscv_free_pcgp_relocs(&pcgp_relocs, abfd, sec);
4067 # define PRSTATUS_SIZE 204
4068 # define PRSTATUS_OFFSET_PR_CURSIG 12
4069 # define PRSTATUS_OFFSET_PR_PID 24
4070 # define PRSTATUS_OFFSET_PR_REG 72
4071 # define ELF_GREGSET_T_SIZE 128
4072 # define PRPSINFO_SIZE 128
4073 # define PRPSINFO_OFFSET_PR_PID 16
4074 # define PRPSINFO_OFFSET_PR_FNAME 32
4075 # define PRPSINFO_OFFSET_PR_PSARGS 48
4077 # define PRSTATUS_SIZE 376
4078 # define PRSTATUS_OFFSET_PR_CURSIG 12
4079 # define PRSTATUS_OFFSET_PR_PID 32
4080 # define PRSTATUS_OFFSET_PR_REG 112
4081 # define ELF_GREGSET_T_SIZE 256
4082 # define PRPSINFO_SIZE 136
4083 # define PRPSINFO_OFFSET_PR_PID 24
4084 # define PRPSINFO_OFFSET_PR_FNAME 40
4085 # define PRPSINFO_OFFSET_PR_PSARGS 56
4088 /* Support for core dump NOTE sections. */
4091 riscv_elf_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
4093 switch (note->descsz)
4098 case PRSTATUS_SIZE: /* sizeof(struct elf_prstatus) on Linux/RISC-V. */
4100 elf_tdata (abfd)->core->signal
4101 = bfd_get_16 (abfd, note->descdata + PRSTATUS_OFFSET_PR_CURSIG);
4104 elf_tdata (abfd)->core->lwpid
4105 = bfd_get_32 (abfd, note->descdata + PRSTATUS_OFFSET_PR_PID);
4109 /* Make a ".reg/999" section. */
4110 return _bfd_elfcore_make_pseudosection (abfd, ".reg", ELF_GREGSET_T_SIZE,
4111 note->descpos + PRSTATUS_OFFSET_PR_REG);
4115 riscv_elf_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
4117 switch (note->descsz)
4122 case PRPSINFO_SIZE: /* sizeof(struct elf_prpsinfo) on Linux/RISC-V. */
4124 elf_tdata (abfd)->core->pid
4125 = bfd_get_32 (abfd, note->descdata + PRPSINFO_OFFSET_PR_PID);
4128 elf_tdata (abfd)->core->program = _bfd_elfcore_strndup
4129 (abfd, note->descdata + PRPSINFO_OFFSET_PR_FNAME, 16);
4132 elf_tdata (abfd)->core->command = _bfd_elfcore_strndup
4133 (abfd, note->descdata + PRPSINFO_OFFSET_PR_PSARGS, 80);
4137 /* Note that for some reason, a spurious space is tacked
4138 onto the end of the args in some (at least one anyway)
4139 implementations, so strip it off if it exists. */
4142 char *command = elf_tdata (abfd)->core->command;
4143 int n = strlen (command);
4145 if (0 < n && command[n - 1] == ' ')
4146 command[n - 1] = '\0';
4152 /* Set the right mach type. */
4154 riscv_elf_object_p (bfd *abfd)
4156 /* There are only two mach types in RISCV currently. */
4157 if (strcmp (abfd->xvec->name, "elf32-littleriscv") == 0)
4158 bfd_default_set_arch_mach (abfd, bfd_arch_riscv, bfd_mach_riscv32);
4160 bfd_default_set_arch_mach (abfd, bfd_arch_riscv, bfd_mach_riscv64);
4165 /* Determine whether an object attribute tag takes an integer, a
4169 riscv_elf_obj_attrs_arg_type (int tag)
4171 return (tag & 1) != 0 ? ATTR_TYPE_FLAG_STR_VAL : ATTR_TYPE_FLAG_INT_VAL;
4174 #define TARGET_LITTLE_SYM riscv_elfNN_vec
4175 #define TARGET_LITTLE_NAME "elfNN-littleriscv"
4177 #define elf_backend_reloc_type_class riscv_reloc_type_class
4179 #define bfd_elfNN_bfd_reloc_name_lookup riscv_reloc_name_lookup
4180 #define bfd_elfNN_bfd_link_hash_table_create riscv_elf_link_hash_table_create
4181 #define bfd_elfNN_bfd_reloc_type_lookup riscv_reloc_type_lookup
4182 #define bfd_elfNN_bfd_merge_private_bfd_data \
4183 _bfd_riscv_elf_merge_private_bfd_data
4185 #define elf_backend_copy_indirect_symbol riscv_elf_copy_indirect_symbol
4186 #define elf_backend_create_dynamic_sections riscv_elf_create_dynamic_sections
4187 #define elf_backend_check_relocs riscv_elf_check_relocs
4188 #define elf_backend_adjust_dynamic_symbol riscv_elf_adjust_dynamic_symbol
4189 #define elf_backend_size_dynamic_sections riscv_elf_size_dynamic_sections
4190 #define elf_backend_relocate_section riscv_elf_relocate_section
4191 #define elf_backend_finish_dynamic_symbol riscv_elf_finish_dynamic_symbol
4192 #define elf_backend_finish_dynamic_sections riscv_elf_finish_dynamic_sections
4193 #define elf_backend_gc_mark_hook riscv_elf_gc_mark_hook
4194 #define elf_backend_plt_sym_val riscv_elf_plt_sym_val
4195 #define elf_backend_grok_prstatus riscv_elf_grok_prstatus
4196 #define elf_backend_grok_psinfo riscv_elf_grok_psinfo
4197 #define elf_backend_object_p riscv_elf_object_p
4198 #define elf_info_to_howto_rel NULL
4199 #define elf_info_to_howto riscv_info_to_howto_rela
4200 #define bfd_elfNN_bfd_relax_section _bfd_riscv_relax_section
4202 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
4204 #define elf_backend_can_gc_sections 1
4205 #define elf_backend_can_refcount 1
4206 #define elf_backend_want_got_plt 1
4207 #define elf_backend_plt_readonly 1
4208 #define elf_backend_plt_alignment 4
4209 #define elf_backend_want_plt_sym 1
4210 #define elf_backend_got_header_size (ARCH_SIZE / 8)
4211 #define elf_backend_want_dynrelro 1
4212 #define elf_backend_rela_normal 1
4213 #define elf_backend_default_execstack 0
4215 #undef elf_backend_obj_attrs_vendor
4216 #define elf_backend_obj_attrs_vendor "riscv"
4217 #undef elf_backend_obj_attrs_arg_type
4218 #define elf_backend_obj_attrs_arg_type riscv_elf_obj_attrs_arg_type
4219 #undef elf_backend_obj_attrs_section_type
4220 #define elf_backend_obj_attrs_section_type SHT_RISCV_ATTRIBUTES
4221 #undef elf_backend_obj_attrs_section
4222 #define elf_backend_obj_attrs_section ".riscv.attributes"
4224 #include "elfNN-target.h"