1 /* RISC-V-specific support for NN-bit ELF.
2 Copyright (C) 2011-2022 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"
41 /* Internal relocations used exclusively by the relaxation pass. */
42 #define R_RISCV_DELETE (R_RISCV_max + 1)
46 #define MINUS_ONE ((bfd_vma)0 - 1)
48 #define RISCV_ELF_LOG_WORD_BYTES (ARCH_SIZE == 32 ? 2 : 3)
50 #define RISCV_ELF_WORD_BYTES (1 << RISCV_ELF_LOG_WORD_BYTES)
52 /* The name of the dynamic interpreter. This is put in the .interp
55 #define ELF64_DYNAMIC_INTERPRETER "/lib/ld.so.1"
56 #define ELF32_DYNAMIC_INTERPRETER "/lib32/ld.so.1"
58 #define ELF_ARCH bfd_arch_riscv
59 #define ELF_TARGET_ID RISCV_ELF_DATA
60 #define ELF_MACHINE_CODE EM_RISCV
61 #define ELF_MAXPAGESIZE 0x1000
62 #define ELF_COMMONPAGESIZE 0x1000
64 #define RISCV_ATTRIBUTES_SECTION_NAME ".riscv.attributes"
66 /* RISC-V ELF linker hash entry. */
68 struct riscv_elf_link_hash_entry
70 struct elf_link_hash_entry elf
;
80 #define riscv_elf_hash_entry(ent) \
81 ((struct riscv_elf_link_hash_entry *) (ent))
83 struct _bfd_riscv_elf_obj_tdata
85 struct elf_obj_tdata root
;
87 /* tls_type for each local got entry. */
88 char *local_got_tls_type
;
91 #define _bfd_riscv_elf_tdata(abfd) \
92 ((struct _bfd_riscv_elf_obj_tdata *) (abfd)->tdata.any)
94 #define _bfd_riscv_elf_local_got_tls_type(abfd) \
95 (_bfd_riscv_elf_tdata (abfd)->local_got_tls_type)
97 #define _bfd_riscv_elf_tls_type(abfd, h, symndx) \
98 (*((h) != NULL ? &riscv_elf_hash_entry (h)->tls_type \
99 : &_bfd_riscv_elf_local_got_tls_type (abfd) [symndx]))
101 #define is_riscv_elf(bfd) \
102 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
103 && elf_tdata (bfd) != NULL \
104 && elf_object_id (bfd) == RISCV_ELF_DATA)
107 elfNN_riscv_mkobject (bfd
*abfd
)
109 return bfd_elf_allocate_object (abfd
,
110 sizeof (struct _bfd_riscv_elf_obj_tdata
),
114 #include "elf/common.h"
115 #include "elf/internal.h"
117 struct riscv_elf_link_hash_table
119 struct elf_link_hash_table elf
;
121 /* Short-cuts to get to dynamic linker sections. */
124 /* The max alignment of output sections. */
125 bfd_vma max_alignment
;
127 /* Used by local STT_GNU_IFUNC symbols. */
128 htab_t loc_hash_table
;
129 void * loc_hash_memory
;
131 /* The index of the last unused .rel.iplt slot. */
132 bfd_vma last_iplt_index
;
134 /* The data segment phase, don't relax the section
135 when it is exp_seg_relro_adjust. */
136 int *data_segment_phase
;
138 /* Relocations for variant CC symbols may be present. */
142 /* Instruction access functions. */
143 #define riscv_get_insn(bits, ptr) \
144 ((bits) == 16 ? bfd_getl16 (ptr) \
145 : (bits) == 32 ? bfd_getl32 (ptr) \
146 : (bits) == 64 ? bfd_getl64 (ptr) \
147 : (abort (), (bfd_vma) - 1))
148 #define riscv_put_insn(bits, val, ptr) \
149 ((bits) == 16 ? bfd_putl16 (val, ptr) \
150 : (bits) == 32 ? bfd_putl32 (val, ptr) \
151 : (bits) == 64 ? bfd_putl64 (val, ptr) \
152 : (abort (), (void) 0))
154 /* Get the RISC-V ELF linker hash table from a link_info structure. */
155 #define riscv_elf_hash_table(p) \
156 ((is_elf_hash_table ((p)->hash) \
157 && elf_hash_table_id (elf_hash_table (p)) == RISCV_ELF_DATA) \
158 ? (struct riscv_elf_link_hash_table *) (p)->hash : NULL)
161 riscv_info_to_howto_rela (bfd
*abfd
,
163 Elf_Internal_Rela
*dst
)
165 cache_ptr
->howto
= riscv_elf_rtype_to_howto (abfd
, ELFNN_R_TYPE (dst
->r_info
));
166 return cache_ptr
->howto
!= NULL
;
170 riscv_elf_append_rela (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
172 const struct elf_backend_data
*bed
;
175 bed
= get_elf_backend_data (abfd
);
176 loc
= s
->contents
+ (s
->reloc_count
++ * bed
->s
->sizeof_rela
);
177 bed
->s
->swap_reloca_out (abfd
, rel
, loc
);
180 /* Return true if a relocation is modifying an instruction. */
183 riscv_is_insn_reloc (const reloc_howto_type
*howto
)
185 /* Heuristic: A multibyte destination with a nontrivial mask
187 return (howto
->bitsize
> 8
188 && howto
->dst_mask
!= 0
189 && ~(howto
->dst_mask
| (howto
->bitsize
< sizeof(bfd_vma
) * CHAR_BIT
190 ? (MINUS_ONE
<< howto
->bitsize
) : (bfd_vma
)0)) != 0);
194 #define PLT_HEADER_INSNS 8
195 #define PLT_ENTRY_INSNS 4
196 #define PLT_HEADER_SIZE (PLT_HEADER_INSNS * 4)
197 #define PLT_ENTRY_SIZE (PLT_ENTRY_INSNS * 4)
198 #define GOT_ENTRY_SIZE RISCV_ELF_WORD_BYTES
199 /* Reserve two entries of GOTPLT for ld.so, one is used for PLT resolver,
200 the other is used for link map. Other targets also reserve one more
201 entry used for runtime profile? */
202 #define GOTPLT_HEADER_SIZE (2 * GOT_ENTRY_SIZE)
204 #define sec_addr(sec) ((sec)->output_section->vma + (sec)->output_offset)
207 # define MATCH_LREG MATCH_LW
209 # define MATCH_LREG MATCH_LD
212 /* Generate a PLT header. */
215 riscv_make_plt_header (bfd
*output_bfd
, bfd_vma gotplt_addr
, bfd_vma addr
,
218 bfd_vma gotplt_offset_high
= RISCV_PCREL_HIGH_PART (gotplt_addr
, addr
);
219 bfd_vma gotplt_offset_low
= RISCV_PCREL_LOW_PART (gotplt_addr
, addr
);
221 /* RVE has no t3 register, so this won't work, and is not supported. */
222 if (elf_elfheader (output_bfd
)->e_flags
& EF_RISCV_RVE
)
224 _bfd_error_handler (_("%pB: warning: RVE PLT generation not supported"),
229 /* auipc t2, %hi(.got.plt)
230 sub t1, t1, t3 # shifted .got.plt offset + hdr size + 12
231 l[w|d] t3, %lo(.got.plt)(t2) # _dl_runtime_resolve
232 addi t1, t1, -(hdr size + 12) # shifted .got.plt offset
233 addi t0, t2, %lo(.got.plt) # &.got.plt
234 srli t1, t1, log2(16/PTRSIZE) # .got.plt offset
235 l[w|d] t0, PTRSIZE(t0) # link map
238 entry
[0] = RISCV_UTYPE (AUIPC
, X_T2
, gotplt_offset_high
);
239 entry
[1] = RISCV_RTYPE (SUB
, X_T1
, X_T1
, X_T3
);
240 entry
[2] = RISCV_ITYPE (LREG
, X_T3
, X_T2
, gotplt_offset_low
);
241 entry
[3] = RISCV_ITYPE (ADDI
, X_T1
, X_T1
, (uint32_t) -(PLT_HEADER_SIZE
+ 12));
242 entry
[4] = RISCV_ITYPE (ADDI
, X_T0
, X_T2
, gotplt_offset_low
);
243 entry
[5] = RISCV_ITYPE (SRLI
, X_T1
, X_T1
, 4 - RISCV_ELF_LOG_WORD_BYTES
);
244 entry
[6] = RISCV_ITYPE (LREG
, X_T0
, X_T0
, RISCV_ELF_WORD_BYTES
);
245 entry
[7] = RISCV_ITYPE (JALR
, 0, X_T3
, 0);
250 /* Generate a PLT entry. */
253 riscv_make_plt_entry (bfd
*output_bfd
, bfd_vma got
, bfd_vma addr
,
256 /* RVE has no t3 register, so this won't work, and is not supported. */
257 if (elf_elfheader (output_bfd
)->e_flags
& EF_RISCV_RVE
)
259 _bfd_error_handler (_("%pB: warning: RVE PLT generation not supported"),
264 /* auipc t3, %hi(.got.plt entry)
265 l[w|d] t3, %lo(.got.plt entry)(t3)
269 entry
[0] = RISCV_UTYPE (AUIPC
, X_T3
, RISCV_PCREL_HIGH_PART (got
, addr
));
270 entry
[1] = RISCV_ITYPE (LREG
, X_T3
, X_T3
, RISCV_PCREL_LOW_PART (got
, addr
));
271 entry
[2] = RISCV_ITYPE (JALR
, X_T1
, X_T3
, 0);
272 entry
[3] = RISCV_NOP
;
277 /* Create an entry in an RISC-V ELF linker hash table. */
279 static struct bfd_hash_entry
*
280 link_hash_newfunc (struct bfd_hash_entry
*entry
,
281 struct bfd_hash_table
*table
, const char *string
)
283 /* Allocate the structure if it has not already been allocated by a
288 bfd_hash_allocate (table
,
289 sizeof (struct riscv_elf_link_hash_entry
));
294 /* Call the allocation method of the superclass. */
295 entry
= _bfd_elf_link_hash_newfunc (entry
, table
, string
);
298 struct riscv_elf_link_hash_entry
*eh
;
300 eh
= (struct riscv_elf_link_hash_entry
*) entry
;
301 eh
->tls_type
= GOT_UNKNOWN
;
307 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
308 for local symbol so that we can handle local STT_GNU_IFUNC symbols
309 as global symbol. We reuse indx and dynstr_index for local symbol
310 hash since they aren't used by global symbols in this backend. */
313 riscv_elf_local_htab_hash (const void *ptr
)
315 struct elf_link_hash_entry
*h
= (struct elf_link_hash_entry
*) ptr
;
316 return ELF_LOCAL_SYMBOL_HASH (h
->indx
, h
->dynstr_index
);
319 /* Compare local hash entries. */
322 riscv_elf_local_htab_eq (const void *ptr1
, const void *ptr2
)
324 struct elf_link_hash_entry
*h1
= (struct elf_link_hash_entry
*) ptr1
;
325 struct elf_link_hash_entry
*h2
= (struct elf_link_hash_entry
*) ptr2
;
327 return h1
->indx
== h2
->indx
&& h1
->dynstr_index
== h2
->dynstr_index
;
330 /* Find and/or create a hash entry for local symbol. */
332 static struct elf_link_hash_entry
*
333 riscv_elf_get_local_sym_hash (struct riscv_elf_link_hash_table
*htab
,
334 bfd
*abfd
, const Elf_Internal_Rela
*rel
,
337 struct riscv_elf_link_hash_entry eh
, *ret
;
338 asection
*sec
= abfd
->sections
;
339 hashval_t h
= ELF_LOCAL_SYMBOL_HASH (sec
->id
,
340 ELFNN_R_SYM (rel
->r_info
));
343 eh
.elf
.indx
= sec
->id
;
344 eh
.elf
.dynstr_index
= ELFNN_R_SYM (rel
->r_info
);
345 slot
= htab_find_slot_with_hash (htab
->loc_hash_table
, &eh
, h
,
346 create
? INSERT
: NO_INSERT
);
353 ret
= (struct riscv_elf_link_hash_entry
*) *slot
;
357 ret
= (struct riscv_elf_link_hash_entry
*)
358 objalloc_alloc ((struct objalloc
*) htab
->loc_hash_memory
,
359 sizeof (struct riscv_elf_link_hash_entry
));
362 memset (ret
, 0, sizeof (*ret
));
363 ret
->elf
.indx
= sec
->id
;
364 ret
->elf
.dynstr_index
= ELFNN_R_SYM (rel
->r_info
);
365 ret
->elf
.dynindx
= -1;
371 /* Destroy a RISC-V elf linker hash table. */
374 riscv_elf_link_hash_table_free (bfd
*obfd
)
376 struct riscv_elf_link_hash_table
*ret
377 = (struct riscv_elf_link_hash_table
*) obfd
->link
.hash
;
379 if (ret
->loc_hash_table
)
380 htab_delete (ret
->loc_hash_table
);
381 if (ret
->loc_hash_memory
)
382 objalloc_free ((struct objalloc
*) ret
->loc_hash_memory
);
384 _bfd_elf_link_hash_table_free (obfd
);
387 /* Create a RISC-V ELF linker hash table. */
389 static struct bfd_link_hash_table
*
390 riscv_elf_link_hash_table_create (bfd
*abfd
)
392 struct riscv_elf_link_hash_table
*ret
;
393 size_t amt
= sizeof (struct riscv_elf_link_hash_table
);
395 ret
= (struct riscv_elf_link_hash_table
*) bfd_zmalloc (amt
);
399 if (!_bfd_elf_link_hash_table_init (&ret
->elf
, abfd
, link_hash_newfunc
,
400 sizeof (struct riscv_elf_link_hash_entry
),
407 ret
->max_alignment
= (bfd_vma
) -1;
409 /* Create hash table for local ifunc. */
410 ret
->loc_hash_table
= htab_try_create (1024,
411 riscv_elf_local_htab_hash
,
412 riscv_elf_local_htab_eq
,
414 ret
->loc_hash_memory
= objalloc_create ();
415 if (!ret
->loc_hash_table
|| !ret
->loc_hash_memory
)
417 riscv_elf_link_hash_table_free (abfd
);
420 ret
->elf
.root
.hash_table_free
= riscv_elf_link_hash_table_free
;
422 return &ret
->elf
.root
;
425 /* Create the .got section. */
428 riscv_elf_create_got_section (bfd
*abfd
, struct bfd_link_info
*info
)
432 struct elf_link_hash_entry
*h
;
433 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
434 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
436 /* This function may be called more than once. */
437 if (htab
->sgot
!= NULL
)
440 flags
= bed
->dynamic_sec_flags
;
442 s
= bfd_make_section_anyway_with_flags (abfd
,
443 (bed
->rela_plts_and_copies_p
444 ? ".rela.got" : ".rel.got"),
445 (bed
->dynamic_sec_flags
448 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
452 s
= s_got
= bfd_make_section_anyway_with_flags (abfd
, ".got", flags
);
454 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
458 /* The first bit of the global offset table is the header. */
459 s
->size
+= bed
->got_header_size
;
461 if (bed
->want_got_plt
)
463 s
= bfd_make_section_anyway_with_flags (abfd
, ".got.plt", flags
);
465 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
469 /* Reserve room for the header. */
470 s
->size
+= GOTPLT_HEADER_SIZE
;
473 if (bed
->want_got_sym
)
475 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
476 section. We don't do this in the linker script because we don't want
477 to define the symbol if we are not creating a global offset
479 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s_got
,
480 "_GLOBAL_OFFSET_TABLE_");
481 elf_hash_table (info
)->hgot
= h
;
489 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
490 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
494 riscv_elf_create_dynamic_sections (bfd
*dynobj
,
495 struct bfd_link_info
*info
)
497 struct riscv_elf_link_hash_table
*htab
;
499 htab
= riscv_elf_hash_table (info
);
500 BFD_ASSERT (htab
!= NULL
);
502 if (!riscv_elf_create_got_section (dynobj
, info
))
505 if (!_bfd_elf_create_dynamic_sections (dynobj
, info
))
508 if (!bfd_link_pic (info
))
510 /* Technically, this section doesn't have contents. It is used as the
511 target of TLS copy relocs, to copy TLS data from shared libraries into
512 the executable. However, if we don't mark it as loadable, then it
513 matches the IS_TBSS test in ldlang.c, and there is no run-time address
514 space allocated for it even though it has SEC_ALLOC. That test is
515 correct for .tbss, but not correct for this section. There is also
516 a second problem that having a section with no contents can only work
517 if it comes after all sections with contents in the same segment,
518 but the linker script does not guarantee that. This is just mixed in
519 with other .tdata.* sections. We can fix both problems by lying and
520 saying that there are contents. This section is expected to be small
521 so this should not cause a significant extra program startup cost. */
523 bfd_make_section_anyway_with_flags (dynobj
, ".tdata.dyn",
524 (SEC_ALLOC
| SEC_THREAD_LOCAL
525 | SEC_LOAD
| SEC_DATA
527 | SEC_LINKER_CREATED
));
530 if (!htab
->elf
.splt
|| !htab
->elf
.srelplt
|| !htab
->elf
.sdynbss
531 || (!bfd_link_pic (info
) && (!htab
->elf
.srelbss
|| !htab
->sdyntdata
)))
537 /* Copy the extra info we tack onto an elf_link_hash_entry. */
540 riscv_elf_copy_indirect_symbol (struct bfd_link_info
*info
,
541 struct elf_link_hash_entry
*dir
,
542 struct elf_link_hash_entry
*ind
)
544 struct riscv_elf_link_hash_entry
*edir
, *eind
;
546 edir
= (struct riscv_elf_link_hash_entry
*) dir
;
547 eind
= (struct riscv_elf_link_hash_entry
*) ind
;
549 if (ind
->root
.type
== bfd_link_hash_indirect
550 && dir
->got
.refcount
<= 0)
552 edir
->tls_type
= eind
->tls_type
;
553 eind
->tls_type
= GOT_UNKNOWN
;
555 _bfd_elf_link_hash_copy_indirect (info
, dir
, ind
);
559 riscv_elf_record_tls_type (bfd
*abfd
, struct elf_link_hash_entry
*h
,
560 unsigned long symndx
, char tls_type
)
562 char *new_tls_type
= &_bfd_riscv_elf_tls_type (abfd
, h
, symndx
);
564 *new_tls_type
|= tls_type
;
565 if ((*new_tls_type
& GOT_NORMAL
) && (*new_tls_type
& ~GOT_NORMAL
))
567 (*_bfd_error_handler
)
568 (_("%pB: `%s' accessed both as normal and thread local symbol"),
569 abfd
, h
? h
->root
.root
.string
: "<local>");
576 riscv_elf_record_got_reference (bfd
*abfd
, struct bfd_link_info
*info
,
577 struct elf_link_hash_entry
*h
, long symndx
)
579 struct riscv_elf_link_hash_table
*htab
= riscv_elf_hash_table (info
);
580 Elf_Internal_Shdr
*symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
582 if (htab
->elf
.sgot
== NULL
)
584 if (!riscv_elf_create_got_section (htab
->elf
.dynobj
, info
))
590 h
->got
.refcount
+= 1;
594 /* This is a global offset table entry for a local symbol. */
595 if (elf_local_got_refcounts (abfd
) == NULL
)
597 bfd_size_type size
= symtab_hdr
->sh_info
* (sizeof (bfd_vma
) + 1);
598 if (!(elf_local_got_refcounts (abfd
) = bfd_zalloc (abfd
, size
)))
600 _bfd_riscv_elf_local_got_tls_type (abfd
)
601 = (char *) (elf_local_got_refcounts (abfd
) + symtab_hdr
->sh_info
);
603 elf_local_got_refcounts (abfd
) [symndx
] += 1;
609 bad_static_reloc (bfd
*abfd
, unsigned r_type
, struct elf_link_hash_entry
*h
)
611 reloc_howto_type
* r
= riscv_elf_rtype_to_howto (abfd
, r_type
);
613 /* We propably can improve the information to tell users that they
614 should be recompile the code with -fPIC or -fPIE, just like what
616 (*_bfd_error_handler
)
617 (_("%pB: relocation %s against `%s' can not be used when making a shared "
618 "object; recompile with -fPIC"),
619 abfd
, r
? r
->name
: _("<unknown>"),
620 h
!= NULL
? h
->root
.root
.string
: "a local symbol");
621 bfd_set_error (bfd_error_bad_value
);
625 /* Look through the relocs for a section during the first phase, and
626 allocate space in the global offset table or procedure linkage
630 riscv_elf_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
,
631 asection
*sec
, const Elf_Internal_Rela
*relocs
)
633 struct riscv_elf_link_hash_table
*htab
;
634 Elf_Internal_Shdr
*symtab_hdr
;
635 struct elf_link_hash_entry
**sym_hashes
;
636 const Elf_Internal_Rela
*rel
;
637 asection
*sreloc
= NULL
;
639 if (bfd_link_relocatable (info
))
642 htab
= riscv_elf_hash_table (info
);
643 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
644 sym_hashes
= elf_sym_hashes (abfd
);
646 if (htab
->elf
.dynobj
== NULL
)
647 htab
->elf
.dynobj
= abfd
;
649 for (rel
= relocs
; rel
< relocs
+ sec
->reloc_count
; rel
++)
652 unsigned int r_symndx
;
653 struct elf_link_hash_entry
*h
;
655 r_symndx
= ELFNN_R_SYM (rel
->r_info
);
656 r_type
= ELFNN_R_TYPE (rel
->r_info
);
658 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
660 (*_bfd_error_handler
) (_("%pB: bad symbol index: %d"),
665 if (r_symndx
< symtab_hdr
->sh_info
)
667 /* A local symbol. */
668 Elf_Internal_Sym
*isym
= bfd_sym_from_r_symndx (&htab
->elf
.sym_cache
,
673 /* Check relocation against local STT_GNU_IFUNC symbol. */
674 if (ELF_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
676 h
= riscv_elf_get_local_sym_hash (htab
, abfd
, rel
, true);
680 /* Fake STT_GNU_IFUNC global symbol. */
681 h
->root
.root
.string
= bfd_elf_sym_name (abfd
, symtab_hdr
,
683 h
->type
= STT_GNU_IFUNC
;
687 h
->root
.type
= bfd_link_hash_defined
;
694 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
695 while (h
->root
.type
== bfd_link_hash_indirect
696 || h
->root
.type
== bfd_link_hash_warning
)
697 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
707 case R_RISCV_CALL_PLT
:
709 case R_RISCV_GOT_HI20
:
710 case R_RISCV_PCREL_HI20
:
711 /* Create the ifunc sections, iplt and ipltgot, for static
713 if (h
->type
== STT_GNU_IFUNC
714 && !_bfd_elf_create_ifunc_sections (htab
->elf
.dynobj
, info
))
722 /* It is referenced by a non-shared object. */
728 case R_RISCV_TLS_GD_HI20
:
729 if (!riscv_elf_record_got_reference (abfd
, info
, h
, r_symndx
)
730 || !riscv_elf_record_tls_type (abfd
, h
, r_symndx
, GOT_TLS_GD
))
734 case R_RISCV_TLS_GOT_HI20
:
735 if (bfd_link_pic (info
))
736 info
->flags
|= DF_STATIC_TLS
;
737 if (!riscv_elf_record_got_reference (abfd
, info
, h
, r_symndx
)
738 || !riscv_elf_record_tls_type (abfd
, h
, r_symndx
, GOT_TLS_IE
))
742 case R_RISCV_GOT_HI20
:
743 if (!riscv_elf_record_got_reference (abfd
, info
, h
, r_symndx
)
744 || !riscv_elf_record_tls_type (abfd
, h
, r_symndx
, GOT_NORMAL
))
749 case R_RISCV_CALL_PLT
:
750 /* These symbol requires a procedure linkage table entry.
751 We actually build the entry in adjust_dynamic_symbol,
752 because these might be a case of linking PIC code without
753 linking in any dynamic objects, in which case we don't
754 need to generate a procedure linkage table after all. */
756 /* If it is a local symbol, then we resolve it directly
757 without creating a PLT entry. */
762 h
->plt
.refcount
+= 1;
765 case R_RISCV_PCREL_HI20
:
767 && h
->type
== STT_GNU_IFUNC
)
770 h
->pointer_equality_needed
= 1;
772 /* We don't use the PCREL_HI20 in the data section,
773 so we always need the plt when it refers to
775 h
->plt
.refcount
+= 1;
781 case R_RISCV_RVC_BRANCH
:
782 case R_RISCV_RVC_JUMP
:
783 /* In shared libraries and pie, these relocs are known
785 if (bfd_link_pic (info
))
789 case R_RISCV_TPREL_HI20
:
790 if (!bfd_link_executable (info
))
791 return bad_static_reloc (abfd
, r_type
, h
);
793 riscv_elf_record_tls_type (abfd
, h
, r_symndx
, GOT_TLS_LE
);
797 if (bfd_link_pic (info
))
798 return bad_static_reloc (abfd
, r_type
, h
);
802 case R_RISCV_JUMP_SLOT
:
803 case R_RISCV_RELATIVE
:
811 && (!bfd_link_pic (info
)
812 || h
->type
== STT_GNU_IFUNC
))
814 /* This reloc might not bind locally. */
816 h
->pointer_equality_needed
= 1;
819 || (sec
->flags
& (SEC_CODE
| SEC_READONLY
)) != 0)
821 /* We may need a .plt entry if the symbol is a function
822 defined in a shared lib or is a function referenced
823 from the code or read-only section. */
824 h
->plt
.refcount
+= 1;
828 /* If we are creating a shared library, and this is a reloc
829 against a global symbol, or a non PC relative reloc
830 against a local symbol, then we need to copy the reloc
831 into the shared library. However, if we are linking with
832 -Bsymbolic, we do not need to copy a reloc against a
833 global symbol which is defined in an object we are
834 including in the link (i.e., DEF_REGULAR is set). At
835 this point we have not seen all the input files, so it is
836 possible that DEF_REGULAR is not set now but will be set
837 later (it is never cleared). In case of a weak definition,
838 DEF_REGULAR may be cleared later by a strong definition in
839 a shared library. We account for that possibility below by
840 storing information in the relocs_copied field of the hash
841 table entry. A similar situation occurs when creating
842 shared libraries and symbol visibility changes render the
845 If on the other hand, we are creating an executable, we
846 may need to keep relocations for symbols satisfied by a
847 dynamic library if we manage to avoid copy relocs for the
850 Generate dynamic pointer relocation against STT_GNU_IFUNC
851 symbol in the non-code section (R_RISCV_32/R_RISCV_64). */
852 reloc_howto_type
* r
= riscv_elf_rtype_to_howto (abfd
, r_type
);
854 if ((bfd_link_pic (info
)
855 && (sec
->flags
& SEC_ALLOC
) != 0
856 && ((r
!= NULL
&& !r
->pc_relative
)
859 || h
->root
.type
== bfd_link_hash_defweak
860 || !h
->def_regular
))))
861 || (!bfd_link_pic (info
)
862 && (sec
->flags
& SEC_ALLOC
) != 0
864 && (h
->root
.type
== bfd_link_hash_defweak
866 || (!bfd_link_pic (info
)
868 && h
->type
== STT_GNU_IFUNC
869 && (sec
->flags
& SEC_CODE
) == 0))
871 struct elf_dyn_relocs
*p
;
872 struct elf_dyn_relocs
**head
;
874 /* When creating a shared object, we must copy these
875 relocs into the output file. We create a reloc
876 section in dynobj and make room for the reloc. */
879 sreloc
= _bfd_elf_make_dynamic_reloc_section
880 (sec
, htab
->elf
.dynobj
, RISCV_ELF_LOG_WORD_BYTES
,
881 abfd
, /*rela?*/ true);
887 /* If this is a global symbol, we count the number of
888 relocations we need for this symbol. */
890 head
= &h
->dyn_relocs
;
893 /* Track dynamic relocs needed for local syms too.
894 We really need local syms available to do this
899 Elf_Internal_Sym
*isym
;
901 isym
= bfd_sym_from_r_symndx (&htab
->elf
.sym_cache
,
906 s
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
910 vpp
= &elf_section_data (s
)->local_dynrel
;
911 head
= (struct elf_dyn_relocs
**) vpp
;
915 if (p
== NULL
|| p
->sec
!= sec
)
917 size_t amt
= sizeof *p
;
918 p
= ((struct elf_dyn_relocs
*)
919 bfd_alloc (htab
->elf
.dynobj
, amt
));
930 p
->pc_count
+= r
== NULL
? 0 : r
->pc_relative
;
943 /* Adjust a symbol defined by a dynamic object and referenced by a
944 regular object. The current definition is in some section of the
945 dynamic object, but we're not including those sections. We have to
946 change the definition to something the rest of the link can
950 riscv_elf_adjust_dynamic_symbol (struct bfd_link_info
*info
,
951 struct elf_link_hash_entry
*h
)
953 struct riscv_elf_link_hash_table
*htab
;
954 struct riscv_elf_link_hash_entry
* eh
;
958 htab
= riscv_elf_hash_table (info
);
959 BFD_ASSERT (htab
!= NULL
);
961 dynobj
= htab
->elf
.dynobj
;
963 /* Make sure we know what is going on here. */
964 BFD_ASSERT (dynobj
!= NULL
966 || h
->type
== STT_GNU_IFUNC
970 && !h
->def_regular
)));
972 /* If this is a function, put it in the procedure linkage table. We
973 will fill in the contents of the procedure linkage table later
974 (although we could actually do it here). */
975 if (h
->type
== STT_FUNC
|| h
->type
== STT_GNU_IFUNC
|| h
->needs_plt
)
977 if (h
->plt
.refcount
<= 0
978 || (h
->type
!= STT_GNU_IFUNC
979 && (SYMBOL_CALLS_LOCAL (info
, h
)
980 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
981 && h
->root
.type
== bfd_link_hash_undefweak
))))
983 /* This case can occur if we saw a R_RISCV_CALL_PLT reloc in an
984 input file, but the symbol was never referred to by a dynamic
985 object, or if all references were garbage collected. In such
986 a case, we don't actually need to build a PLT entry. */
987 h
->plt
.offset
= (bfd_vma
) -1;
994 h
->plt
.offset
= (bfd_vma
) -1;
996 /* If this is a weak symbol, and there is a real definition, the
997 processor independent code will have arranged for us to see the
998 real definition first, and we can just use the same value. */
1001 struct elf_link_hash_entry
*def
= weakdef (h
);
1002 BFD_ASSERT (def
->root
.type
== bfd_link_hash_defined
);
1003 h
->root
.u
.def
.section
= def
->root
.u
.def
.section
;
1004 h
->root
.u
.def
.value
= def
->root
.u
.def
.value
;
1008 /* This is a reference to a symbol defined by a dynamic object which
1009 is not a function. */
1011 /* If we are creating a shared library, we must presume that the
1012 only references to the symbol are via the global offset table.
1013 For such cases we need not do anything here; the relocations will
1014 be handled correctly by relocate_section. */
1015 if (bfd_link_pic (info
))
1018 /* If there are no references to this symbol that do not use the
1019 GOT, we don't need to generate a copy reloc. */
1020 if (!h
->non_got_ref
)
1023 /* If -z nocopyreloc was given, we won't generate them either. */
1024 if (info
->nocopyreloc
)
1030 /* If we don't find any dynamic relocs in read-only sections, then
1031 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1032 if (!_bfd_elf_readonly_dynrelocs (h
))
1038 /* We must allocate the symbol in our .dynbss section, which will
1039 become part of the .bss section of the executable. There will be
1040 an entry for this symbol in the .dynsym section. The dynamic
1041 object will contain position independent code, so all references
1042 from the dynamic object to this symbol will go through the global
1043 offset table. The dynamic linker will use the .dynsym entry to
1044 determine the address it must put in the global offset table, so
1045 both the dynamic object and the regular object will refer to the
1046 same memory location for the variable. */
1048 /* We must generate a R_RISCV_COPY reloc to tell the dynamic linker
1049 to copy the initial value out of the dynamic object and into the
1050 runtime process image. We need to remember the offset into the
1051 .rel.bss section we are going to use. */
1052 eh
= (struct riscv_elf_link_hash_entry
*) h
;
1053 if (eh
->tls_type
& ~GOT_NORMAL
)
1055 s
= htab
->sdyntdata
;
1056 srel
= htab
->elf
.srelbss
;
1058 else if ((h
->root
.u
.def
.section
->flags
& SEC_READONLY
) != 0)
1060 s
= htab
->elf
.sdynrelro
;
1061 srel
= htab
->elf
.sreldynrelro
;
1065 s
= htab
->elf
.sdynbss
;
1066 srel
= htab
->elf
.srelbss
;
1068 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0 && h
->size
!= 0)
1070 srel
->size
+= sizeof (ElfNN_External_Rela
);
1074 return _bfd_elf_adjust_dynamic_copy (info
, h
, s
);
1077 /* Allocate space in .plt, .got and associated reloc sections for
1081 allocate_dynrelocs (struct elf_link_hash_entry
*h
, void *inf
)
1083 struct bfd_link_info
*info
;
1084 struct riscv_elf_link_hash_table
*htab
;
1085 struct elf_dyn_relocs
*p
;
1087 if (h
->root
.type
== bfd_link_hash_indirect
)
1090 info
= (struct bfd_link_info
*) inf
;
1091 htab
= riscv_elf_hash_table (info
);
1092 BFD_ASSERT (htab
!= NULL
);
1094 /* When we are generating pde, make sure gp symbol is output as a
1095 dynamic symbol. Then ld.so can set the gp register earlier, before
1096 resolving the ifunc. */
1097 if (!bfd_link_pic (info
)
1098 && htab
->elf
.dynamic_sections_created
1099 && strcmp (h
->root
.root
.string
, RISCV_GP_SYMBOL
) == 0
1100 && !bfd_elf_link_record_dynamic_symbol (info
, h
))
1103 /* Since STT_GNU_IFUNC symbols must go through PLT, we handle them
1104 in the allocate_ifunc_dynrelocs and allocate_local_ifunc_dynrelocs,
1105 if they are defined and referenced in a non-shared object. */
1106 if (h
->type
== STT_GNU_IFUNC
1109 else if (htab
->elf
.dynamic_sections_created
1110 && h
->plt
.refcount
> 0)
1112 /* Make sure this symbol is output as a dynamic symbol.
1113 Undefined weak syms won't yet be marked as dynamic. */
1114 if (h
->dynindx
== -1
1115 && !h
->forced_local
)
1117 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
1121 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, bfd_link_pic (info
), h
))
1123 asection
*s
= htab
->elf
.splt
;
1126 s
->size
= PLT_HEADER_SIZE
;
1128 h
->plt
.offset
= s
->size
;
1130 /* Make room for this entry. */
1131 s
->size
+= PLT_ENTRY_SIZE
;
1133 /* We also need to make an entry in the .got.plt section. */
1134 htab
->elf
.sgotplt
->size
+= GOT_ENTRY_SIZE
;
1136 /* We also need to make an entry in the .rela.plt section. */
1137 htab
->elf
.srelplt
->size
+= sizeof (ElfNN_External_Rela
);
1139 /* If this symbol is not defined in a regular file, and we are
1140 not generating a shared library, then set the symbol to this
1141 location in the .plt. This is required to make function
1142 pointers compare as equal between the normal executable and
1143 the shared library. */
1144 if (! bfd_link_pic (info
)
1147 h
->root
.u
.def
.section
= s
;
1148 h
->root
.u
.def
.value
= h
->plt
.offset
;
1151 /* If the symbol has STO_RISCV_VARIANT_CC flag, then raise the
1152 variant_cc flag of riscv_elf_link_hash_table. */
1153 if (h
->other
& STO_RISCV_VARIANT_CC
)
1154 htab
->variant_cc
= 1;
1158 h
->plt
.offset
= (bfd_vma
) -1;
1164 h
->plt
.offset
= (bfd_vma
) -1;
1168 if (h
->got
.refcount
> 0)
1172 int tls_type
= riscv_elf_hash_entry (h
)->tls_type
;
1174 /* Make sure this symbol is output as a dynamic symbol.
1175 Undefined weak syms won't yet be marked as dynamic. */
1176 if (h
->dynindx
== -1
1177 && !h
->forced_local
)
1179 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
1184 h
->got
.offset
= s
->size
;
1185 dyn
= htab
->elf
.dynamic_sections_created
;
1186 if (tls_type
& (GOT_TLS_GD
| GOT_TLS_IE
))
1188 /* TLS_GD needs two dynamic relocs and two GOT slots. */
1189 if (tls_type
& GOT_TLS_GD
)
1191 s
->size
+= 2 * RISCV_ELF_WORD_BYTES
;
1192 htab
->elf
.srelgot
->size
+= 2 * sizeof (ElfNN_External_Rela
);
1195 /* TLS_IE needs one dynamic reloc and one GOT slot. */
1196 if (tls_type
& GOT_TLS_IE
)
1198 s
->size
+= RISCV_ELF_WORD_BYTES
;
1199 htab
->elf
.srelgot
->size
+= sizeof (ElfNN_External_Rela
);
1204 s
->size
+= RISCV_ELF_WORD_BYTES
;
1205 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, bfd_link_pic (info
), h
)
1206 && ! UNDEFWEAK_NO_DYNAMIC_RELOC (info
, h
))
1207 htab
->elf
.srelgot
->size
+= sizeof (ElfNN_External_Rela
);
1211 h
->got
.offset
= (bfd_vma
) -1;
1213 if (h
->dyn_relocs
== NULL
)
1216 /* In the shared -Bsymbolic case, discard space allocated for
1217 dynamic pc-relative relocs against symbols which turn out to be
1218 defined in regular objects. For the normal shared case, discard
1219 space for pc-relative relocs that have become local due to symbol
1220 visibility changes. */
1222 if (bfd_link_pic (info
))
1224 if (SYMBOL_CALLS_LOCAL (info
, h
))
1226 struct elf_dyn_relocs
**pp
;
1228 for (pp
= &h
->dyn_relocs
; (p
= *pp
) != NULL
; )
1230 p
->count
-= p
->pc_count
;
1239 /* Also discard relocs on undefined weak syms with non-default
1241 if (h
->dyn_relocs
!= NULL
1242 && h
->root
.type
== bfd_link_hash_undefweak
)
1244 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1245 || UNDEFWEAK_NO_DYNAMIC_RELOC (info
, h
))
1246 h
->dyn_relocs
= NULL
;
1248 /* Make sure undefined weak symbols are output as a dynamic
1250 else if (h
->dynindx
== -1
1251 && !h
->forced_local
)
1253 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
1260 /* For the non-shared case, discard space for relocs against
1261 symbols which turn out to need copy relocs or are not
1267 || (htab
->elf
.dynamic_sections_created
1268 && (h
->root
.type
== bfd_link_hash_undefweak
1269 || h
->root
.type
== bfd_link_hash_undefined
))))
1271 /* Make sure this symbol is output as a dynamic symbol.
1272 Undefined weak syms won't yet be marked as dynamic. */
1273 if (h
->dynindx
== -1
1274 && !h
->forced_local
)
1276 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
1280 /* If that succeeded, we know we'll be keeping all the
1282 if (h
->dynindx
!= -1)
1286 h
->dyn_relocs
= NULL
;
1291 /* Finally, allocate space. */
1292 for (p
= h
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
1294 asection
*sreloc
= elf_section_data (p
->sec
)->sreloc
;
1295 sreloc
->size
+= p
->count
* sizeof (ElfNN_External_Rela
);
1301 /* Allocate space in .plt, .got and associated reloc sections for
1302 ifunc dynamic relocs. */
1305 allocate_ifunc_dynrelocs (struct elf_link_hash_entry
*h
,
1308 struct bfd_link_info
*info
;
1310 if (h
->root
.type
== bfd_link_hash_indirect
)
1313 if (h
->root
.type
== bfd_link_hash_warning
)
1314 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1316 info
= (struct bfd_link_info
*) inf
;
1318 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
1319 here if it is defined and referenced in a non-shared object. */
1320 if (h
->type
== STT_GNU_IFUNC
1322 return _bfd_elf_allocate_ifunc_dyn_relocs (info
, h
,
1331 /* Allocate space in .plt, .got and associated reloc sections for
1332 local ifunc dynamic relocs. */
1335 allocate_local_ifunc_dynrelocs (void **slot
, void *inf
)
1337 struct elf_link_hash_entry
*h
1338 = (struct elf_link_hash_entry
*) *slot
;
1340 if (h
->type
!= STT_GNU_IFUNC
1344 || h
->root
.type
!= bfd_link_hash_defined
)
1347 return allocate_ifunc_dynrelocs (h
, inf
);
1351 riscv_elf_size_dynamic_sections (bfd
*output_bfd
, struct bfd_link_info
*info
)
1353 struct riscv_elf_link_hash_table
*htab
;
1358 htab
= riscv_elf_hash_table (info
);
1359 BFD_ASSERT (htab
!= NULL
);
1360 dynobj
= htab
->elf
.dynobj
;
1361 BFD_ASSERT (dynobj
!= NULL
);
1363 if (elf_hash_table (info
)->dynamic_sections_created
)
1365 /* Set the contents of the .interp section to the interpreter. */
1366 if (bfd_link_executable (info
) && !info
->nointerp
)
1368 s
= bfd_get_linker_section (dynobj
, ".interp");
1369 BFD_ASSERT (s
!= NULL
);
1370 s
->size
= strlen (ELFNN_DYNAMIC_INTERPRETER
) + 1;
1371 s
->contents
= (unsigned char *) ELFNN_DYNAMIC_INTERPRETER
;
1375 /* Set up .got offsets for local syms, and space for local dynamic
1377 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
1379 bfd_signed_vma
*local_got
;
1380 bfd_signed_vma
*end_local_got
;
1381 char *local_tls_type
;
1382 bfd_size_type locsymcount
;
1383 Elf_Internal_Shdr
*symtab_hdr
;
1386 if (! is_riscv_elf (ibfd
))
1389 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
1391 struct elf_dyn_relocs
*p
;
1393 for (p
= elf_section_data (s
)->local_dynrel
; p
!= NULL
; p
= p
->next
)
1395 if (!bfd_is_abs_section (p
->sec
)
1396 && bfd_is_abs_section (p
->sec
->output_section
))
1398 /* Input section has been discarded, either because
1399 it is a copy of a linkonce section or due to
1400 linker script /DISCARD/, so we'll be discarding
1403 else if (p
->count
!= 0)
1405 srel
= elf_section_data (p
->sec
)->sreloc
;
1406 srel
->size
+= p
->count
* sizeof (ElfNN_External_Rela
);
1407 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0)
1408 info
->flags
|= DF_TEXTREL
;
1413 local_got
= elf_local_got_refcounts (ibfd
);
1417 symtab_hdr
= &elf_symtab_hdr (ibfd
);
1418 locsymcount
= symtab_hdr
->sh_info
;
1419 end_local_got
= local_got
+ locsymcount
;
1420 local_tls_type
= _bfd_riscv_elf_local_got_tls_type (ibfd
);
1422 srel
= htab
->elf
.srelgot
;
1423 for (; local_got
< end_local_got
; ++local_got
, ++local_tls_type
)
1427 *local_got
= s
->size
;
1428 s
->size
+= RISCV_ELF_WORD_BYTES
;
1429 if (*local_tls_type
& GOT_TLS_GD
)
1430 s
->size
+= RISCV_ELF_WORD_BYTES
;
1431 if (bfd_link_pic (info
)
1432 || (*local_tls_type
& (GOT_TLS_GD
| GOT_TLS_IE
)))
1433 srel
->size
+= sizeof (ElfNN_External_Rela
);
1436 *local_got
= (bfd_vma
) -1;
1440 /* Allocate .plt and .got entries and space dynamic relocs for
1442 elf_link_hash_traverse (&htab
->elf
, allocate_dynrelocs
, info
);
1444 /* Allocate .plt and .got entries and space dynamic relocs for
1445 global ifunc symbols. */
1446 elf_link_hash_traverse (&htab
->elf
, allocate_ifunc_dynrelocs
, info
);
1448 /* Allocate .plt and .got entries and space dynamic relocs for
1449 local ifunc symbols. */
1450 htab_traverse (htab
->loc_hash_table
, allocate_local_ifunc_dynrelocs
, info
);
1452 /* Used to resolve the dynamic relocs overwite problems when
1453 generating static executable. */
1454 if (htab
->elf
.irelplt
)
1455 htab
->last_iplt_index
= htab
->elf
.irelplt
->reloc_count
- 1;
1457 if (htab
->elf
.sgotplt
)
1459 struct elf_link_hash_entry
*got
;
1460 got
= elf_link_hash_lookup (elf_hash_table (info
),
1461 "_GLOBAL_OFFSET_TABLE_",
1462 false, false, false);
1464 /* Don't allocate .got.plt section if there are no GOT nor PLT
1465 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
1467 || !got
->ref_regular_nonweak
)
1468 && (htab
->elf
.sgotplt
->size
== GOTPLT_HEADER_SIZE
)
1469 && (htab
->elf
.splt
== NULL
1470 || htab
->elf
.splt
->size
== 0)
1471 && (htab
->elf
.sgot
== NULL
1472 || (htab
->elf
.sgot
->size
1473 == get_elf_backend_data (output_bfd
)->got_header_size
)))
1474 htab
->elf
.sgotplt
->size
= 0;
1477 /* The check_relocs and adjust_dynamic_symbol entry points have
1478 determined the sizes of the various dynamic sections. Allocate
1480 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
1482 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
1485 if (s
== htab
->elf
.splt
1486 || s
== htab
->elf
.sgot
1487 || s
== htab
->elf
.sgotplt
1488 || s
== htab
->elf
.iplt
1489 || s
== htab
->elf
.igotplt
1490 || s
== htab
->elf
.sdynbss
1491 || s
== htab
->elf
.sdynrelro
1492 || s
== htab
->sdyntdata
)
1494 /* Strip this section if we don't need it; see the
1497 else if (startswith (s
->name
, ".rela"))
1501 /* We use the reloc_count field as a counter if we need
1502 to copy relocs into the output file. */
1508 /* It's not one of our sections. */
1514 /* If we don't need this section, strip it from the
1515 output file. This is mostly to handle .rela.bss and
1516 .rela.plt. We must create both sections in
1517 create_dynamic_sections, because they must be created
1518 before the linker maps input sections to output
1519 sections. The linker does that before
1520 adjust_dynamic_symbol is called, and it is that
1521 function which decides whether anything needs to go
1522 into these sections. */
1523 s
->flags
|= SEC_EXCLUDE
;
1527 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
1530 /* Allocate memory for the section contents. Zero the memory
1531 for the benefit of .rela.plt, which has 4 unused entries
1532 at the beginning, and we don't want garbage. */
1533 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
1534 if (s
->contents
== NULL
)
1538 /* Add dynamic entries. */
1539 if (elf_hash_table (info
)->dynamic_sections_created
)
1541 if (!_bfd_elf_add_dynamic_tags (output_bfd
, info
, true))
1544 if (htab
->variant_cc
1545 && !_bfd_elf_add_dynamic_entry (info
, DT_RISCV_VARIANT_CC
, 0))
1553 #define DTP_OFFSET 0x800
1555 /* Return the relocation value for a TLS dtp-relative reloc. */
1558 dtpoff (struct bfd_link_info
*info
, bfd_vma address
)
1560 /* If tls_sec is NULL, we should have signalled an error already. */
1561 if (elf_hash_table (info
)->tls_sec
== NULL
)
1563 return address
- elf_hash_table (info
)->tls_sec
->vma
- DTP_OFFSET
;
1566 /* Return the relocation value for a static TLS tp-relative relocation. */
1569 tpoff (struct bfd_link_info
*info
, bfd_vma address
)
1571 /* If tls_sec is NULL, we should have signalled an error already. */
1572 if (elf_hash_table (info
)->tls_sec
== NULL
)
1574 return address
- elf_hash_table (info
)->tls_sec
->vma
- TP_OFFSET
;
1577 /* Return the global pointer's value, or 0 if it is not in use. */
1580 riscv_global_pointer_value (struct bfd_link_info
*info
)
1582 struct bfd_link_hash_entry
*h
;
1584 h
= bfd_link_hash_lookup (info
->hash
, RISCV_GP_SYMBOL
, false, false, true);
1585 if (h
== NULL
|| h
->type
!= bfd_link_hash_defined
)
1588 return h
->u
.def
.value
+ sec_addr (h
->u
.def
.section
);
1591 /* Emplace a static relocation. */
1593 static bfd_reloc_status_type
1594 perform_relocation (const reloc_howto_type
*howto
,
1595 const Elf_Internal_Rela
*rel
,
1597 asection
*input_section
,
1601 if (howto
->pc_relative
)
1602 value
-= sec_addr (input_section
) + rel
->r_offset
;
1603 value
+= rel
->r_addend
;
1605 switch (ELFNN_R_TYPE (rel
->r_info
))
1608 case R_RISCV_TPREL_HI20
:
1609 case R_RISCV_PCREL_HI20
:
1610 case R_RISCV_GOT_HI20
:
1611 case R_RISCV_TLS_GOT_HI20
:
1612 case R_RISCV_TLS_GD_HI20
:
1613 if (ARCH_SIZE
> 32 && !VALID_UTYPE_IMM (RISCV_CONST_HIGH_PART (value
)))
1614 return bfd_reloc_overflow
;
1615 value
= ENCODE_UTYPE_IMM (RISCV_CONST_HIGH_PART (value
));
1618 case R_RISCV_LO12_I
:
1619 case R_RISCV_GPREL_I
:
1620 case R_RISCV_TPREL_LO12_I
:
1621 case R_RISCV_TPREL_I
:
1622 case R_RISCV_PCREL_LO12_I
:
1623 value
= ENCODE_ITYPE_IMM (value
);
1626 case R_RISCV_LO12_S
:
1627 case R_RISCV_GPREL_S
:
1628 case R_RISCV_TPREL_LO12_S
:
1629 case R_RISCV_TPREL_S
:
1630 case R_RISCV_PCREL_LO12_S
:
1631 value
= ENCODE_STYPE_IMM (value
);
1635 case R_RISCV_CALL_PLT
:
1636 if (ARCH_SIZE
> 32 && !VALID_UTYPE_IMM (RISCV_CONST_HIGH_PART (value
)))
1637 return bfd_reloc_overflow
;
1638 value
= ENCODE_UTYPE_IMM (RISCV_CONST_HIGH_PART (value
))
1639 | (ENCODE_ITYPE_IMM (value
) << 32);
1643 if (!VALID_JTYPE_IMM (value
))
1644 return bfd_reloc_overflow
;
1645 value
= ENCODE_JTYPE_IMM (value
);
1648 case R_RISCV_BRANCH
:
1649 if (!VALID_BTYPE_IMM (value
))
1650 return bfd_reloc_overflow
;
1651 value
= ENCODE_BTYPE_IMM (value
);
1654 case R_RISCV_RVC_BRANCH
:
1655 if (!VALID_CBTYPE_IMM (value
))
1656 return bfd_reloc_overflow
;
1657 value
= ENCODE_CBTYPE_IMM (value
);
1660 case R_RISCV_RVC_JUMP
:
1661 if (!VALID_CJTYPE_IMM (value
))
1662 return bfd_reloc_overflow
;
1663 value
= ENCODE_CJTYPE_IMM (value
);
1666 case R_RISCV_RVC_LUI
:
1667 if (RISCV_CONST_HIGH_PART (value
) == 0)
1669 /* Linker relaxation can convert an address equal to or greater than
1670 0x800 to slightly below 0x800. C.LUI does not accept zero as a
1671 valid immediate. We can fix this by converting it to a C.LI. */
1672 bfd_vma insn
= riscv_get_insn (howto
->bitsize
,
1673 contents
+ rel
->r_offset
);
1674 insn
= (insn
& ~MATCH_C_LUI
) | MATCH_C_LI
;
1675 riscv_put_insn (howto
->bitsize
, insn
, contents
+ rel
->r_offset
);
1676 value
= ENCODE_CITYPE_IMM (0);
1678 else if (!VALID_CITYPE_LUI_IMM (RISCV_CONST_HIGH_PART (value
)))
1679 return bfd_reloc_overflow
;
1681 value
= ENCODE_CITYPE_LUI_IMM (RISCV_CONST_HIGH_PART (value
));
1699 case R_RISCV_32_PCREL
:
1700 case R_RISCV_TLS_DTPREL32
:
1701 case R_RISCV_TLS_DTPREL64
:
1704 case R_RISCV_DELETE
:
1705 return bfd_reloc_ok
;
1708 return bfd_reloc_notsupported
;
1712 if (riscv_is_insn_reloc (howto
))
1713 word
= riscv_get_insn (howto
->bitsize
, contents
+ rel
->r_offset
);
1715 word
= bfd_get (howto
->bitsize
, input_bfd
, contents
+ rel
->r_offset
);
1716 word
= (word
& ~howto
->dst_mask
) | (value
& howto
->dst_mask
);
1717 if (riscv_is_insn_reloc (howto
))
1718 riscv_put_insn (howto
->bitsize
, word
, contents
+ rel
->r_offset
);
1720 bfd_put (howto
->bitsize
, input_bfd
, word
, contents
+ rel
->r_offset
);
1722 return bfd_reloc_ok
;
1725 /* Remember all PC-relative high-part relocs we've encountered to help us
1726 later resolve the corresponding low-part relocs. */
1732 /* Relocation value with addend. */
1734 /* Original reloc type. */
1736 } riscv_pcrel_hi_reloc
;
1738 typedef struct riscv_pcrel_lo_reloc
1740 /* PC value of auipc. */
1742 /* Internal relocation. */
1743 const Elf_Internal_Rela
*reloc
;
1744 /* Record the following information helps to resolve the %pcrel
1745 which cross different input section. For now we build a hash
1746 for pcrel at the start of riscv_elf_relocate_section, and then
1747 free the hash at the end. But riscv_elf_relocate_section only
1748 handles an input section at a time, so that means we can only
1749 resolve the %pcrel_hi and %pcrel_lo which are in the same input
1750 section. Otherwise, we will report dangerous relocation errors
1751 for those %pcrel which are not in the same input section. */
1752 asection
*input_section
;
1753 struct bfd_link_info
*info
;
1754 reloc_howto_type
*howto
;
1756 /* The next riscv_pcrel_lo_reloc. */
1757 struct riscv_pcrel_lo_reloc
*next
;
1758 } riscv_pcrel_lo_reloc
;
1762 /* Hash table for riscv_pcrel_hi_reloc. */
1764 /* Linked list for riscv_pcrel_lo_reloc. */
1765 riscv_pcrel_lo_reloc
*lo_relocs
;
1766 } riscv_pcrel_relocs
;
1769 riscv_pcrel_reloc_hash (const void *entry
)
1771 const riscv_pcrel_hi_reloc
*e
= entry
;
1772 return (hashval_t
)(e
->address
>> 2);
1776 riscv_pcrel_reloc_eq (const void *entry1
, const void *entry2
)
1778 const riscv_pcrel_hi_reloc
*e1
= entry1
, *e2
= entry2
;
1779 return e1
->address
== e2
->address
;
1783 riscv_init_pcrel_relocs (riscv_pcrel_relocs
*p
)
1785 p
->lo_relocs
= NULL
;
1786 p
->hi_relocs
= htab_create (1024, riscv_pcrel_reloc_hash
,
1787 riscv_pcrel_reloc_eq
, free
);
1788 return p
->hi_relocs
!= NULL
;
1792 riscv_free_pcrel_relocs (riscv_pcrel_relocs
*p
)
1794 riscv_pcrel_lo_reloc
*cur
= p
->lo_relocs
;
1798 riscv_pcrel_lo_reloc
*next
= cur
->next
;
1803 htab_delete (p
->hi_relocs
);
1807 riscv_zero_pcrel_hi_reloc (Elf_Internal_Rela
*rel
,
1808 struct bfd_link_info
*info
,
1812 const reloc_howto_type
*howto
)
1814 /* We may need to reference low addreses in PC-relative modes even when the
1815 PC is far away from these addresses. For example, undefweak references
1816 need to produce the address 0 when linked. As 0 is far from the arbitrary
1817 addresses that we can link PC-relative programs at, the linker can't
1818 actually relocate references to those symbols. In order to allow these
1819 programs to work we simply convert the PC-relative auipc sequences to
1820 0-relative lui sequences. */
1821 if (bfd_link_pic (info
))
1824 /* If it's possible to reference the symbol using auipc we do so, as that's
1825 more in the spirit of the PC-relative relocations we're processing. */
1826 bfd_vma offset
= addr
- pc
;
1827 if (ARCH_SIZE
== 32 || VALID_UTYPE_IMM (RISCV_CONST_HIGH_PART (offset
)))
1830 /* If it's impossible to reference this with a LUI-based offset then don't
1831 bother to convert it at all so users still see the PC-relative relocation
1832 in the truncation message. */
1833 if (ARCH_SIZE
> 32 && !VALID_UTYPE_IMM (RISCV_CONST_HIGH_PART (addr
)))
1836 rel
->r_info
= ELFNN_R_INFO (addr
, R_RISCV_HI20
);
1838 bfd_vma insn
= riscv_get_insn (howto
->bitsize
, contents
+ rel
->r_offset
);
1839 insn
= (insn
& ~MASK_AUIPC
) | MATCH_LUI
;
1840 riscv_put_insn (howto
->bitsize
, insn
, contents
+ rel
->r_offset
);
1845 riscv_record_pcrel_hi_reloc (riscv_pcrel_relocs
*p
,
1851 bfd_vma offset
= absolute
? value
: value
- addr
;
1852 riscv_pcrel_hi_reloc entry
= {addr
, offset
, type
};
1853 riscv_pcrel_hi_reloc
**slot
=
1854 (riscv_pcrel_hi_reloc
**) htab_find_slot (p
->hi_relocs
, &entry
, INSERT
);
1856 BFD_ASSERT (*slot
== NULL
);
1857 *slot
= (riscv_pcrel_hi_reloc
*) bfd_malloc (sizeof (riscv_pcrel_hi_reloc
));
1865 riscv_record_pcrel_lo_reloc (riscv_pcrel_relocs
*p
,
1867 const Elf_Internal_Rela
*reloc
,
1868 asection
*input_section
,
1869 struct bfd_link_info
*info
,
1870 reloc_howto_type
*howto
,
1873 riscv_pcrel_lo_reloc
*entry
;
1874 entry
= (riscv_pcrel_lo_reloc
*) bfd_malloc (sizeof (riscv_pcrel_lo_reloc
));
1877 *entry
= (riscv_pcrel_lo_reloc
) {addr
, reloc
, input_section
, info
,
1878 howto
, contents
, p
->lo_relocs
};
1879 p
->lo_relocs
= entry
;
1884 riscv_resolve_pcrel_lo_relocs (riscv_pcrel_relocs
*p
)
1886 riscv_pcrel_lo_reloc
*r
;
1888 for (r
= p
->lo_relocs
; r
!= NULL
; r
= r
->next
)
1890 bfd
*input_bfd
= r
->input_section
->owner
;
1892 riscv_pcrel_hi_reloc search
= {r
->address
, 0, 0};
1893 riscv_pcrel_hi_reloc
*entry
= htab_find (p
->hi_relocs
, &search
);
1894 /* There may be a risk if the %pcrel_lo with addend refers to
1895 an IFUNC symbol. The %pcrel_hi has been relocated to plt,
1896 so the corresponding %pcrel_lo with addend looks wrong. */
1897 char *string
= NULL
;
1899 string
= _("%pcrel_lo missing matching %pcrel_hi");
1900 else if (entry
->type
== R_RISCV_GOT_HI20
1901 && r
->reloc
->r_addend
!= 0)
1902 string
= _("%pcrel_lo with addend isn't allowed for R_RISCV_GOT_HI20");
1903 else if (RISCV_CONST_HIGH_PART (entry
->value
)
1904 != RISCV_CONST_HIGH_PART (entry
->value
+ r
->reloc
->r_addend
))
1906 /* Check the overflow when adding reloc addend. */
1907 if (asprintf (&string
,
1908 _("%%pcrel_lo overflow with an addend, the "
1909 "value of %%pcrel_hi is 0x%" PRIx64
" without "
1910 "any addend, but may be 0x%" PRIx64
" after "
1911 "adding the %%pcrel_lo addend"),
1912 (int64_t) RISCV_CONST_HIGH_PART (entry
->value
),
1913 (int64_t) RISCV_CONST_HIGH_PART
1914 (entry
->value
+ r
->reloc
->r_addend
)) == -1)
1915 string
= _("%pcrel_lo overflow with an addend");
1920 (*r
->info
->callbacks
->reloc_dangerous
)
1921 (r
->info
, string
, input_bfd
, r
->input_section
, r
->reloc
->r_offset
);
1925 perform_relocation (r
->howto
, r
->reloc
, entry
->value
, r
->input_section
,
1926 input_bfd
, r
->contents
);
1932 /* Relocate a RISC-V ELF section.
1934 The RELOCATE_SECTION function is called by the new ELF backend linker
1935 to handle the relocations for a section.
1937 The relocs are always passed as Rela structures.
1939 This function is responsible for adjusting the section contents as
1940 necessary, and (if generating a relocatable output file) adjusting
1941 the reloc addend as necessary.
1943 This function does not have to worry about setting the reloc
1944 address or the reloc symbol index.
1946 LOCAL_SYMS is a pointer to the swapped in local symbols.
1948 LOCAL_SECTIONS is an array giving the section in the input file
1949 corresponding to the st_shndx field of each local symbol.
1951 The global hash table entry for the global symbols can be found
1952 via elf_sym_hashes (input_bfd).
1954 When generating relocatable output, this function must handle
1955 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
1956 going to be the section symbol corresponding to the output
1957 section, which means that the addend must be adjusted
1961 riscv_elf_relocate_section (bfd
*output_bfd
,
1962 struct bfd_link_info
*info
,
1964 asection
*input_section
,
1966 Elf_Internal_Rela
*relocs
,
1967 Elf_Internal_Sym
*local_syms
,
1968 asection
**local_sections
)
1970 Elf_Internal_Rela
*rel
;
1971 Elf_Internal_Rela
*relend
;
1972 riscv_pcrel_relocs pcrel_relocs
;
1974 struct riscv_elf_link_hash_table
*htab
= riscv_elf_hash_table (info
);
1975 Elf_Internal_Shdr
*symtab_hdr
= &elf_symtab_hdr (input_bfd
);
1976 struct elf_link_hash_entry
**sym_hashes
= elf_sym_hashes (input_bfd
);
1977 bfd_vma
*local_got_offsets
= elf_local_got_offsets (input_bfd
);
1980 if (!riscv_init_pcrel_relocs (&pcrel_relocs
))
1983 relend
= relocs
+ input_section
->reloc_count
;
1984 for (rel
= relocs
; rel
< relend
; rel
++)
1986 unsigned long r_symndx
;
1987 struct elf_link_hash_entry
*h
;
1988 Elf_Internal_Sym
*sym
;
1991 bfd_reloc_status_type r
= bfd_reloc_ok
;
1992 const char *name
= NULL
;
1993 bfd_vma off
, ie_off
;
1994 bool unresolved_reloc
, is_ie
= false;
1995 bfd_vma pc
= sec_addr (input_section
) + rel
->r_offset
;
1996 int r_type
= ELFNN_R_TYPE (rel
->r_info
), tls_type
;
1997 reloc_howto_type
*howto
= riscv_elf_rtype_to_howto (input_bfd
, r_type
);
1998 const char *msg
= NULL
;
1999 char *msg_buf
= NULL
;
2000 bool resolved_to_zero
;
2005 /* This is a final link. */
2006 r_symndx
= ELFNN_R_SYM (rel
->r_info
);
2010 unresolved_reloc
= false;
2011 if (r_symndx
< symtab_hdr
->sh_info
)
2013 sym
= local_syms
+ r_symndx
;
2014 sec
= local_sections
[r_symndx
];
2015 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
, &sec
, rel
);
2017 /* Relocate against local STT_GNU_IFUNC symbol. */
2018 if (!bfd_link_relocatable (info
)
2019 && ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
2021 h
= riscv_elf_get_local_sym_hash (htab
, input_bfd
, rel
, false);
2025 /* Set STT_GNU_IFUNC symbol value. */
2026 h
->root
.u
.def
.value
= sym
->st_value
;
2027 h
->root
.u
.def
.section
= sec
;
2032 bool warned
, ignored
;
2034 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
2035 r_symndx
, symtab_hdr
, sym_hashes
,
2037 unresolved_reloc
, warned
, ignored
);
2040 /* To avoid generating warning messages about truncated
2041 relocations, set the relocation's address to be the same as
2042 the start of this section. */
2043 if (input_section
->output_section
!= NULL
)
2044 relocation
= input_section
->output_section
->vma
;
2050 if (sec
!= NULL
&& discarded_section (sec
))
2051 RELOC_AGAINST_DISCARDED_SECTION (info
, input_bfd
, input_section
,
2052 rel
, 1, relend
, howto
, 0, contents
);
2054 if (bfd_link_relocatable (info
))
2057 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2058 it here if it is defined in a non-shared object. */
2060 && h
->type
== STT_GNU_IFUNC
2063 asection
*plt
, *base_got
;
2065 if ((input_section
->flags
& SEC_ALLOC
) == 0)
2067 /* If this is a SHT_NOTE section without SHF_ALLOC, treat
2068 STT_GNU_IFUNC symbol as STT_FUNC. */
2069 if (elf_section_type (input_section
) == SHT_NOTE
)
2072 /* Dynamic relocs are not propagated for SEC_DEBUGGING
2073 sections because such sections are not SEC_ALLOC and
2074 thus ld.so will not process them. */
2075 if ((input_section
->flags
& SEC_DEBUGGING
) != 0)
2080 else if (h
->plt
.offset
== (bfd_vma
) -1
2081 /* The following relocation may not need the .plt entries
2082 when all references to a STT_GNU_IFUNC symbols are done
2083 via GOT or static function pointers. */
2084 && r_type
!= R_RISCV_32
2085 && r_type
!= R_RISCV_64
2086 && r_type
!= R_RISCV_HI20
2087 && r_type
!= R_RISCV_GOT_HI20
2088 && r_type
!= R_RISCV_LO12_I
2089 && r_type
!= R_RISCV_LO12_S
)
2090 goto bad_ifunc_reloc
;
2092 /* STT_GNU_IFUNC symbol must go through PLT. */
2093 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
2094 relocation
= plt
->output_section
->vma
2095 + plt
->output_offset
2102 if (rel
->r_addend
!= 0)
2104 if (h
->root
.root
.string
)
2105 name
= h
->root
.root
.string
;
2107 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, sym
, NULL
);
2110 /* xgettext:c-format */
2111 (_("%pB: relocation %s against STT_GNU_IFUNC "
2112 "symbol `%s' has non-zero addend: %" PRId64
),
2113 input_bfd
, howto
->name
, name
, (int64_t) rel
->r_addend
);
2114 bfd_set_error (bfd_error_bad_value
);
2118 /* Generate dynamic relocation only when there is a non-GOT
2119 reference in a shared object or there is no PLT. */
2120 if ((bfd_link_pic (info
) && h
->non_got_ref
)
2121 || h
->plt
.offset
== (bfd_vma
) -1)
2123 Elf_Internal_Rela outrel
;
2126 /* Need a dynamic relocation to get the real function
2128 outrel
.r_offset
= _bfd_elf_section_offset (output_bfd
,
2132 if (outrel
.r_offset
== (bfd_vma
) -1
2133 || outrel
.r_offset
== (bfd_vma
) -2)
2136 outrel
.r_offset
+= input_section
->output_section
->vma
2137 + input_section
->output_offset
;
2139 if (h
->dynindx
== -1
2141 || bfd_link_executable (info
))
2143 info
->callbacks
->minfo
2144 (_("Local IFUNC function `%s' in %pB\n"),
2145 h
->root
.root
.string
,
2146 h
->root
.u
.def
.section
->owner
);
2148 /* This symbol is resolved locally. */
2149 outrel
.r_info
= ELFNN_R_INFO (0, R_RISCV_IRELATIVE
);
2150 outrel
.r_addend
= h
->root
.u
.def
.value
2151 + h
->root
.u
.def
.section
->output_section
->vma
2152 + h
->root
.u
.def
.section
->output_offset
;
2156 outrel
.r_info
= ELFNN_R_INFO (h
->dynindx
, r_type
);
2157 outrel
.r_addend
= 0;
2160 /* Dynamic relocations are stored in
2161 1. .rela.ifunc section in PIC object.
2162 2. .rela.got section in dynamic executable.
2163 3. .rela.iplt section in static executable. */
2164 if (bfd_link_pic (info
))
2165 sreloc
= htab
->elf
.irelifunc
;
2166 else if (htab
->elf
.splt
!= NULL
)
2167 sreloc
= htab
->elf
.srelgot
;
2169 sreloc
= htab
->elf
.irelplt
;
2171 riscv_elf_append_rela (output_bfd
, sreloc
, &outrel
);
2173 /* If this reloc is against an external symbol, we
2174 do not want to fiddle with the addend. Otherwise,
2175 we need to include the symbol value so that it
2176 becomes an addend for the dynamic reloc. For an
2177 internal symbol, we have updated addend. */
2182 case R_RISCV_GOT_HI20
:
2183 base_got
= htab
->elf
.sgot
;
2184 off
= h
->got
.offset
;
2186 if (base_got
== NULL
)
2189 if (off
== (bfd_vma
) -1)
2193 /* We can't use h->got.offset here to save state, or
2194 even just remember the offset, as finish_dynamic_symbol
2195 would use that as offset into .got. */
2197 if (htab
->elf
.splt
!= NULL
)
2199 plt_idx
= (h
->plt
.offset
- PLT_HEADER_SIZE
)
2201 off
= GOTPLT_HEADER_SIZE
+ (plt_idx
* GOT_ENTRY_SIZE
);
2202 base_got
= htab
->elf
.sgotplt
;
2206 plt_idx
= h
->plt
.offset
/ PLT_ENTRY_SIZE
;
2207 off
= plt_idx
* GOT_ENTRY_SIZE
;
2208 base_got
= htab
->elf
.igotplt
;
2211 if (h
->dynindx
== -1
2215 /* This references the local definition. We must
2216 initialize this entry in the global offset table.
2217 Since the offset must always be a multiple of 8,
2218 we use the least significant bit to record
2219 whether we have initialized it already.
2221 When doing a dynamic link, we create a .rela.got
2222 relocation entry to initialize the value. This
2223 is done in the finish_dynamic_symbol routine. */
2228 bfd_put_NN (output_bfd
, relocation
,
2229 base_got
->contents
+ off
);
2230 /* Note that this is harmless for the case,
2231 as -1 | 1 still is -1. */
2237 relocation
= base_got
->output_section
->vma
2238 + base_got
->output_offset
+ off
;
2240 if (!riscv_record_pcrel_hi_reloc (&pcrel_relocs
, pc
,
2243 r
= bfd_reloc_overflow
;
2247 case R_RISCV_CALL_PLT
:
2249 case R_RISCV_LO12_I
:
2250 case R_RISCV_LO12_S
:
2253 case R_RISCV_PCREL_HI20
:
2254 if (!riscv_record_pcrel_hi_reloc (&pcrel_relocs
, pc
,
2257 r
= bfd_reloc_overflow
;
2262 if (h
->root
.root
.string
)
2263 name
= h
->root
.root
.string
;
2265 /* The entry of local ifunc is fake in global hash table,
2266 we should find the name by the original local symbol. */
2267 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, sym
, NULL
);
2270 /* xgettext:c-format */
2271 (_("%pB: relocation %s against STT_GNU_IFUNC "
2272 "symbol `%s' isn't supported"), input_bfd
,
2274 bfd_set_error (bfd_error_bad_value
);
2281 name
= h
->root
.root
.string
;
2284 name
= (bfd_elf_string_from_elf_section
2285 (input_bfd
, symtab_hdr
->sh_link
, sym
->st_name
));
2286 if (name
== NULL
|| *name
== '\0')
2287 name
= bfd_section_name (sec
);
2290 resolved_to_zero
= (h
!= NULL
2291 && UNDEFWEAK_NO_DYNAMIC_RELOC (info
, h
));
2297 case R_RISCV_TPREL_ADD
:
2299 case R_RISCV_JUMP_SLOT
:
2300 case R_RISCV_RELATIVE
:
2301 /* These require nothing of us at all. */
2305 case R_RISCV_BRANCH
:
2306 case R_RISCV_RVC_BRANCH
:
2307 case R_RISCV_RVC_LUI
:
2308 case R_RISCV_LO12_I
:
2309 case R_RISCV_LO12_S
:
2314 case R_RISCV_32_PCREL
:
2315 case R_RISCV_DELETE
:
2316 /* These require no special handling beyond perform_relocation. */
2319 case R_RISCV_GOT_HI20
:
2324 off
= h
->got
.offset
;
2325 BFD_ASSERT (off
!= (bfd_vma
) -1);
2326 dyn
= elf_hash_table (info
)->dynamic_sections_created
;
2327 pic
= bfd_link_pic (info
);
2329 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, pic
, h
)
2330 || (pic
&& SYMBOL_REFERENCES_LOCAL (info
, h
)))
2332 /* This is actually a static link, or it is a
2333 -Bsymbolic link and the symbol is defined
2334 locally, or the symbol was forced to be local
2335 because of a version file. We must initialize
2336 this entry in the global offset table. Since the
2337 offset must always be a multiple of the word size,
2338 we use the least significant bit to record whether
2339 we have initialized it already.
2341 When doing a dynamic link, we create a .rela.got
2342 relocation entry to initialize the value. This
2343 is done in the finish_dynamic_symbol routine. */
2348 bfd_put_NN (output_bfd
, relocation
,
2349 htab
->elf
.sgot
->contents
+ off
);
2354 unresolved_reloc
= false;
2358 BFD_ASSERT (local_got_offsets
!= NULL
2359 && local_got_offsets
[r_symndx
] != (bfd_vma
) -1);
2361 off
= local_got_offsets
[r_symndx
];
2363 /* The offset must always be a multiple of the word size.
2364 So, we can use the least significant bit to record
2365 whether we have already processed this entry. */
2370 if (bfd_link_pic (info
))
2373 Elf_Internal_Rela outrel
;
2375 /* We need to generate a R_RISCV_RELATIVE reloc
2376 for the dynamic linker. */
2377 s
= htab
->elf
.srelgot
;
2378 BFD_ASSERT (s
!= NULL
);
2380 outrel
.r_offset
= sec_addr (htab
->elf
.sgot
) + off
;
2382 ELFNN_R_INFO (0, R_RISCV_RELATIVE
);
2383 outrel
.r_addend
= relocation
;
2385 riscv_elf_append_rela (output_bfd
, s
, &outrel
);
2388 bfd_put_NN (output_bfd
, relocation
,
2389 htab
->elf
.sgot
->contents
+ off
);
2390 local_got_offsets
[r_symndx
] |= 1;
2394 if (rel
->r_addend
!= 0)
2396 msg
= _("The addend isn't allowed for R_RISCV_GOT_HI20");
2397 r
= bfd_reloc_dangerous
;
2401 /* Address of got entry. */
2402 relocation
= sec_addr (htab
->elf
.sgot
) + off
;
2403 absolute
= riscv_zero_pcrel_hi_reloc (rel
, info
, pc
,
2404 relocation
, contents
,
2406 /* Update howto if relocation is changed. */
2407 howto
= riscv_elf_rtype_to_howto (input_bfd
,
2408 ELFNN_R_TYPE (rel
->r_info
));
2410 r
= bfd_reloc_notsupported
;
2411 else if (!riscv_record_pcrel_hi_reloc (&pcrel_relocs
, pc
,
2414 r
= bfd_reloc_overflow
;
2423 bfd_vma old_value
= bfd_get (howto
->bitsize
, input_bfd
,
2424 contents
+ rel
->r_offset
);
2425 relocation
= old_value
+ relocation
;
2435 bfd_vma old_value
= bfd_get (howto
->bitsize
, input_bfd
,
2436 contents
+ rel
->r_offset
);
2437 relocation
= old_value
- relocation
;
2442 case R_RISCV_CALL_PLT
:
2443 /* Handle a call to an undefined weak function. This won't be
2444 relaxed, so we have to handle it here. */
2445 if (h
!= NULL
&& h
->root
.type
== bfd_link_hash_undefweak
2446 && (!bfd_link_pic (info
) || h
->plt
.offset
== MINUS_ONE
))
2448 /* We can use x0 as the base register. */
2449 bfd_vma insn
= bfd_getl32 (contents
+ rel
->r_offset
+ 4);
2450 insn
&= ~(OP_MASK_RS1
<< OP_SH_RS1
);
2451 bfd_putl32 (insn
, contents
+ rel
->r_offset
+ 4);
2452 /* Set the relocation value so that we get 0 after the pc
2453 relative adjustment. */
2454 relocation
= sec_addr (input_section
) + rel
->r_offset
;
2459 case R_RISCV_RVC_JUMP
:
2460 /* This line has to match the check in _bfd_riscv_relax_section. */
2461 if (bfd_link_pic (info
) && h
!= NULL
&& h
->plt
.offset
!= MINUS_ONE
)
2463 /* Refer to the PLT entry. */
2464 relocation
= sec_addr (htab
->elf
.splt
) + h
->plt
.offset
;
2465 unresolved_reloc
= false;
2469 case R_RISCV_TPREL_HI20
:
2470 relocation
= tpoff (info
, relocation
);
2473 case R_RISCV_TPREL_LO12_I
:
2474 case R_RISCV_TPREL_LO12_S
:
2475 relocation
= tpoff (info
, relocation
);
2478 case R_RISCV_TPREL_I
:
2479 case R_RISCV_TPREL_S
:
2480 relocation
= tpoff (info
, relocation
);
2481 if (VALID_ITYPE_IMM (relocation
+ rel
->r_addend
))
2483 /* We can use tp as the base register. */
2484 bfd_vma insn
= bfd_getl32 (contents
+ rel
->r_offset
);
2485 insn
&= ~(OP_MASK_RS1
<< OP_SH_RS1
);
2486 insn
|= X_TP
<< OP_SH_RS1
;
2487 bfd_putl32 (insn
, contents
+ rel
->r_offset
);
2490 r
= bfd_reloc_overflow
;
2493 case R_RISCV_GPREL_I
:
2494 case R_RISCV_GPREL_S
:
2496 bfd_vma gp
= riscv_global_pointer_value (info
);
2497 bool x0_base
= VALID_ITYPE_IMM (relocation
+ rel
->r_addend
);
2498 if (x0_base
|| VALID_ITYPE_IMM (relocation
+ rel
->r_addend
- gp
))
2500 /* We can use x0 or gp as the base register. */
2501 bfd_vma insn
= bfd_getl32 (contents
+ rel
->r_offset
);
2502 insn
&= ~(OP_MASK_RS1
<< OP_SH_RS1
);
2505 rel
->r_addend
-= gp
;
2506 insn
|= X_GP
<< OP_SH_RS1
;
2508 bfd_putl32 (insn
, contents
+ rel
->r_offset
);
2511 r
= bfd_reloc_overflow
;
2515 case R_RISCV_PCREL_HI20
:
2516 absolute
= riscv_zero_pcrel_hi_reloc (rel
, info
, pc
, relocation
,
2518 /* Update howto if relocation is changed. */
2519 howto
= riscv_elf_rtype_to_howto (input_bfd
,
2520 ELFNN_R_TYPE (rel
->r_info
));
2522 r
= bfd_reloc_notsupported
;
2523 else if (!riscv_record_pcrel_hi_reloc (&pcrel_relocs
, pc
,
2524 relocation
+ rel
->r_addend
,
2526 r
= bfd_reloc_overflow
;
2529 case R_RISCV_PCREL_LO12_I
:
2530 case R_RISCV_PCREL_LO12_S
:
2531 /* We don't allow section symbols plus addends as the auipc address,
2532 because then riscv_relax_delete_bytes would have to search through
2533 all relocs to update these addends. This is also ambiguous, as
2534 we do allow offsets to be added to the target address, which are
2535 not to be used to find the auipc address. */
2536 if (((sym
!= NULL
&& (ELF_ST_TYPE (sym
->st_info
) == STT_SECTION
))
2537 || (h
!= NULL
&& h
->type
== STT_SECTION
))
2540 msg
= _("%pcrel_lo section symbol with an addend");
2541 r
= bfd_reloc_dangerous
;
2545 if (riscv_record_pcrel_lo_reloc (&pcrel_relocs
, relocation
, rel
,
2546 input_section
, info
, howto
,
2549 r
= bfd_reloc_overflow
;
2552 case R_RISCV_TLS_DTPREL32
:
2553 case R_RISCV_TLS_DTPREL64
:
2554 relocation
= dtpoff (info
, relocation
);
2559 if ((input_section
->flags
& SEC_ALLOC
) == 0)
2562 if ((bfd_link_pic (info
)
2564 || (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2565 && !resolved_to_zero
)
2566 || h
->root
.type
!= bfd_link_hash_undefweak
)
2567 && (!howto
->pc_relative
2568 || !SYMBOL_CALLS_LOCAL (info
, h
)))
2569 || (!bfd_link_pic (info
)
2575 || h
->root
.type
== bfd_link_hash_undefweak
2576 || h
->root
.type
== bfd_link_hash_undefined
)))
2578 Elf_Internal_Rela outrel
;
2580 bool skip_static_relocation
, skip_dynamic_relocation
;
2582 /* When generating a shared object, these relocations
2583 are copied into the output file to be resolved at run
2587 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
2589 skip_static_relocation
= outrel
.r_offset
!= (bfd_vma
) -2;
2590 skip_dynamic_relocation
= outrel
.r_offset
>= (bfd_vma
) -2;
2591 outrel
.r_offset
+= sec_addr (input_section
);
2593 if (skip_dynamic_relocation
)
2594 memset (&outrel
, 0, sizeof outrel
);
2595 else if (h
!= NULL
&& h
->dynindx
!= -1
2596 && !(bfd_link_pic (info
)
2597 && SYMBOLIC_BIND (info
, h
)
2600 outrel
.r_info
= ELFNN_R_INFO (h
->dynindx
, r_type
);
2601 outrel
.r_addend
= rel
->r_addend
;
2605 outrel
.r_info
= ELFNN_R_INFO (0, R_RISCV_RELATIVE
);
2606 outrel
.r_addend
= relocation
+ rel
->r_addend
;
2609 sreloc
= elf_section_data (input_section
)->sreloc
;
2610 riscv_elf_append_rela (output_bfd
, sreloc
, &outrel
);
2611 if (skip_static_relocation
)
2616 case R_RISCV_TLS_GOT_HI20
:
2620 case R_RISCV_TLS_GD_HI20
:
2623 off
= h
->got
.offset
;
2628 off
= local_got_offsets
[r_symndx
];
2629 local_got_offsets
[r_symndx
] |= 1;
2632 tls_type
= _bfd_riscv_elf_tls_type (input_bfd
, h
, r_symndx
);
2633 BFD_ASSERT (tls_type
& (GOT_TLS_IE
| GOT_TLS_GD
));
2634 /* If this symbol is referenced by both GD and IE TLS, the IE
2635 reference's GOT slot follows the GD reference's slots. */
2637 if ((tls_type
& GOT_TLS_GD
) && (tls_type
& GOT_TLS_IE
))
2638 ie_off
= 2 * GOT_ENTRY_SIZE
;
2644 Elf_Internal_Rela outrel
;
2646 bool need_relocs
= false;
2648 if (htab
->elf
.srelgot
== NULL
)
2654 dyn
= htab
->elf
.dynamic_sections_created
;
2655 pic
= bfd_link_pic (info
);
2657 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, pic
, h
)
2658 && (!pic
|| !SYMBOL_REFERENCES_LOCAL (info
, h
)))
2662 /* The GOT entries have not been initialized yet. Do it
2663 now, and emit any relocations. */
2664 if ((bfd_link_pic (info
) || indx
!= 0)
2666 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2667 || h
->root
.type
!= bfd_link_hash_undefweak
))
2670 if (tls_type
& GOT_TLS_GD
)
2674 outrel
.r_offset
= sec_addr (htab
->elf
.sgot
) + off
;
2675 outrel
.r_addend
= 0;
2676 outrel
.r_info
= ELFNN_R_INFO (indx
, R_RISCV_TLS_DTPMODNN
);
2677 bfd_put_NN (output_bfd
, 0,
2678 htab
->elf
.sgot
->contents
+ off
);
2679 riscv_elf_append_rela (output_bfd
, htab
->elf
.srelgot
, &outrel
);
2682 BFD_ASSERT (! unresolved_reloc
);
2683 bfd_put_NN (output_bfd
,
2684 dtpoff (info
, relocation
),
2685 (htab
->elf
.sgot
->contents
2686 + off
+ RISCV_ELF_WORD_BYTES
));
2690 bfd_put_NN (output_bfd
, 0,
2691 (htab
->elf
.sgot
->contents
2692 + off
+ RISCV_ELF_WORD_BYTES
));
2693 outrel
.r_info
= ELFNN_R_INFO (indx
, R_RISCV_TLS_DTPRELNN
);
2694 outrel
.r_offset
+= RISCV_ELF_WORD_BYTES
;
2695 riscv_elf_append_rela (output_bfd
, htab
->elf
.srelgot
, &outrel
);
2700 /* If we are not emitting relocations for a
2701 general dynamic reference, then we must be in a
2702 static link or an executable link with the
2703 symbol binding locally. Mark it as belonging
2704 to module 1, the executable. */
2705 bfd_put_NN (output_bfd
, 1,
2706 htab
->elf
.sgot
->contents
+ off
);
2707 bfd_put_NN (output_bfd
,
2708 dtpoff (info
, relocation
),
2709 (htab
->elf
.sgot
->contents
2710 + off
+ RISCV_ELF_WORD_BYTES
));
2714 if (tls_type
& GOT_TLS_IE
)
2718 bfd_put_NN (output_bfd
, 0,
2719 htab
->elf
.sgot
->contents
+ off
+ ie_off
);
2720 outrel
.r_offset
= sec_addr (htab
->elf
.sgot
)
2722 outrel
.r_addend
= 0;
2724 outrel
.r_addend
= tpoff (info
, relocation
);
2725 outrel
.r_info
= ELFNN_R_INFO (indx
, R_RISCV_TLS_TPRELNN
);
2726 riscv_elf_append_rela (output_bfd
, htab
->elf
.srelgot
, &outrel
);
2730 bfd_put_NN (output_bfd
, tpoff (info
, relocation
),
2731 htab
->elf
.sgot
->contents
+ off
+ ie_off
);
2736 BFD_ASSERT (off
< (bfd_vma
) -2);
2737 relocation
= sec_addr (htab
->elf
.sgot
) + off
+ (is_ie
? ie_off
: 0);
2738 if (!riscv_record_pcrel_hi_reloc (&pcrel_relocs
, pc
,
2741 r
= bfd_reloc_overflow
;
2742 unresolved_reloc
= false;
2746 r
= bfd_reloc_notsupported
;
2749 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2750 because such sections are not SEC_ALLOC and thus ld.so will
2751 not process them. */
2752 if (unresolved_reloc
2753 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
2755 && _bfd_elf_section_offset (output_bfd
, info
, input_section
,
2756 rel
->r_offset
) != (bfd_vma
) -1)
2761 case R_RISCV_RVC_JUMP
:
2762 if (asprintf (&msg_buf
,
2763 _("%%X%%P: relocation %s against `%s' can "
2764 "not be used when making a shared object; "
2765 "recompile with -fPIC\n"),
2767 h
->root
.root
.string
) == -1)
2772 if (asprintf (&msg_buf
,
2773 _("%%X%%P: unresolvable %s relocation against "
2776 h
->root
.root
.string
) == -1)
2782 r
= bfd_reloc_notsupported
;
2786 if (r
== bfd_reloc_ok
)
2787 r
= perform_relocation (howto
, rel
, relocation
, input_section
,
2788 input_bfd
, contents
);
2790 /* We should have already detected the error and set message before.
2791 If the error message isn't set since the linker runs out of memory
2792 or we don't set it before, then we should set the default message
2793 with the "internal error" string here. */
2799 case bfd_reloc_overflow
:
2800 info
->callbacks
->reloc_overflow
2801 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
2802 (bfd_vma
) 0, input_bfd
, input_section
, rel
->r_offset
);
2805 case bfd_reloc_undefined
:
2806 info
->callbacks
->undefined_symbol
2807 (info
, name
, input_bfd
, input_section
, rel
->r_offset
,
2811 case bfd_reloc_outofrange
:
2813 msg
= _("%X%P: internal error: out of range error\n");
2816 case bfd_reloc_notsupported
:
2818 msg
= _("%X%P: internal error: unsupported relocation error\n");
2821 case bfd_reloc_dangerous
:
2822 /* The error message should already be set. */
2824 msg
= _("dangerous relocation error");
2825 info
->callbacks
->reloc_dangerous
2826 (info
, msg
, input_bfd
, input_section
, rel
->r_offset
);
2830 msg
= _("%X%P: internal error: unknown error\n");
2834 /* Do not report error message for the dangerous relocation again. */
2835 if (msg
&& r
!= bfd_reloc_dangerous
)
2836 info
->callbacks
->einfo (msg
);
2838 /* Free the unused `msg_buf`. */
2841 /* We already reported the error via a callback, so don't try to report
2842 it again by returning false. That leads to spurious errors. */
2847 ret
= riscv_resolve_pcrel_lo_relocs (&pcrel_relocs
);
2849 riscv_free_pcrel_relocs (&pcrel_relocs
);
2853 /* Finish up dynamic symbol handling. We set the contents of various
2854 dynamic sections here. */
2857 riscv_elf_finish_dynamic_symbol (bfd
*output_bfd
,
2858 struct bfd_link_info
*info
,
2859 struct elf_link_hash_entry
*h
,
2860 Elf_Internal_Sym
*sym
)
2862 struct riscv_elf_link_hash_table
*htab
= riscv_elf_hash_table (info
);
2863 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
2865 if (h
->plt
.offset
!= (bfd_vma
) -1)
2867 /* We've decided to create a PLT entry for this symbol. */
2869 bfd_vma i
, header_address
, plt_idx
, got_offset
, got_address
;
2870 uint32_t plt_entry
[PLT_ENTRY_INSNS
];
2871 Elf_Internal_Rela rela
;
2872 asection
*plt
, *gotplt
, *relplt
;
2874 /* When building a static executable, use .iplt, .igot.plt and
2875 .rela.iplt sections for STT_GNU_IFUNC symbols. */
2876 if (htab
->elf
.splt
!= NULL
)
2878 plt
= htab
->elf
.splt
;
2879 gotplt
= htab
->elf
.sgotplt
;
2880 relplt
= htab
->elf
.srelplt
;
2884 plt
= htab
->elf
.iplt
;
2885 gotplt
= htab
->elf
.igotplt
;
2886 relplt
= htab
->elf
.irelplt
;
2889 /* This symbol has an entry in the procedure linkage table. Set
2891 if ((h
->dynindx
== -1
2892 && !((h
->forced_local
|| bfd_link_executable (info
))
2894 && h
->type
== STT_GNU_IFUNC
))
2900 /* Calculate the address of the PLT header. */
2901 header_address
= sec_addr (plt
);
2903 /* Calculate the index of the entry and the offset of .got.plt entry.
2904 For static executables, we don't reserve anything. */
2905 if (plt
== htab
->elf
.splt
)
2907 plt_idx
= (h
->plt
.offset
- PLT_HEADER_SIZE
) / PLT_ENTRY_SIZE
;
2908 got_offset
= GOTPLT_HEADER_SIZE
+ (plt_idx
* GOT_ENTRY_SIZE
);
2912 plt_idx
= h
->plt
.offset
/ PLT_ENTRY_SIZE
;
2913 got_offset
= plt_idx
* GOT_ENTRY_SIZE
;
2916 /* Calculate the address of the .got.plt entry. */
2917 got_address
= sec_addr (gotplt
) + got_offset
;
2919 /* Find out where the .plt entry should go. */
2920 loc
= plt
->contents
+ h
->plt
.offset
;
2922 /* Fill in the PLT entry itself. */
2923 if (! riscv_make_plt_entry (output_bfd
, got_address
,
2924 header_address
+ h
->plt
.offset
,
2928 for (i
= 0; i
< PLT_ENTRY_INSNS
; i
++)
2929 bfd_putl32 (plt_entry
[i
], loc
+ 4*i
);
2931 /* Fill in the initial value of the .got.plt entry. */
2932 loc
= gotplt
->contents
+ (got_address
- sec_addr (gotplt
));
2933 bfd_put_NN (output_bfd
, sec_addr (plt
), loc
);
2935 rela
.r_offset
= got_address
;
2937 if (h
->dynindx
== -1
2938 || ((bfd_link_executable (info
)
2939 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2941 && h
->type
== STT_GNU_IFUNC
))
2943 info
->callbacks
->minfo (_("Local IFUNC function `%s' in %pB\n"),
2944 h
->root
.root
.string
,
2945 h
->root
.u
.def
.section
->owner
);
2947 /* If an STT_GNU_IFUNC symbol is locally defined, generate
2948 R_RISCV_IRELATIVE instead of R_RISCV_JUMP_SLOT. */
2949 asection
*sec
= h
->root
.u
.def
.section
;
2950 rela
.r_info
= ELFNN_R_INFO (0, R_RISCV_IRELATIVE
);
2951 rela
.r_addend
= h
->root
.u
.def
.value
2952 + sec
->output_section
->vma
2953 + sec
->output_offset
;
2957 /* Fill in the entry in the .rela.plt section. */
2958 rela
.r_info
= ELFNN_R_INFO (h
->dynindx
, R_RISCV_JUMP_SLOT
);
2962 loc
= relplt
->contents
+ plt_idx
* sizeof (ElfNN_External_Rela
);
2963 bed
->s
->swap_reloca_out (output_bfd
, &rela
, loc
);
2965 if (!h
->def_regular
)
2967 /* Mark the symbol as undefined, rather than as defined in
2968 the .plt section. Leave the value alone. */
2969 sym
->st_shndx
= SHN_UNDEF
;
2970 /* If the symbol is weak, we do need to clear the value.
2971 Otherwise, the PLT entry would provide a definition for
2972 the symbol even if the symbol wasn't defined anywhere,
2973 and so the symbol would never be NULL. */
2974 if (!h
->ref_regular_nonweak
)
2979 if (h
->got
.offset
!= (bfd_vma
) -1
2980 && !(riscv_elf_hash_entry (h
)->tls_type
& (GOT_TLS_GD
| GOT_TLS_IE
))
2981 && !UNDEFWEAK_NO_DYNAMIC_RELOC (info
, h
))
2985 Elf_Internal_Rela rela
;
2986 bool use_elf_append_rela
= true;
2988 /* This symbol has an entry in the GOT. Set it up. */
2990 sgot
= htab
->elf
.sgot
;
2991 srela
= htab
->elf
.srelgot
;
2992 BFD_ASSERT (sgot
!= NULL
&& srela
!= NULL
);
2994 rela
.r_offset
= sec_addr (sgot
) + (h
->got
.offset
&~ (bfd_vma
) 1);
2996 /* Handle the ifunc symbol in GOT entry. */
2998 && h
->type
== STT_GNU_IFUNC
)
3000 if (h
->plt
.offset
== (bfd_vma
) -1)
3002 /* STT_GNU_IFUNC is referenced without PLT. */
3004 if (htab
->elf
.splt
== NULL
)
3006 /* Use .rela.iplt section to store .got relocations
3007 in static executable. */
3008 srela
= htab
->elf
.irelplt
;
3010 /* Do not use riscv_elf_append_rela to add dynamic
3012 use_elf_append_rela
= false;
3015 if (SYMBOL_REFERENCES_LOCAL (info
, h
))
3017 info
->callbacks
->minfo (_("Local IFUNC function `%s' in %pB\n"),
3018 h
->root
.root
.string
,
3019 h
->root
.u
.def
.section
->owner
);
3021 rela
.r_info
= ELFNN_R_INFO (0, R_RISCV_IRELATIVE
);
3022 rela
.r_addend
= (h
->root
.u
.def
.value
3023 + h
->root
.u
.def
.section
->output_section
->vma
3024 + h
->root
.u
.def
.section
->output_offset
);
3028 /* Generate R_RISCV_NN. */
3029 BFD_ASSERT ((h
->got
.offset
& 1) == 0);
3030 BFD_ASSERT (h
->dynindx
!= -1);
3031 rela
.r_info
= ELFNN_R_INFO (h
->dynindx
, R_RISCV_NN
);
3035 else if (bfd_link_pic (info
))
3037 /* Generate R_RISCV_NN. */
3038 BFD_ASSERT ((h
->got
.offset
& 1) == 0);
3039 BFD_ASSERT (h
->dynindx
!= -1);
3040 rela
.r_info
= ELFNN_R_INFO (h
->dynindx
, R_RISCV_NN
);
3047 if (!h
->pointer_equality_needed
)
3050 /* For non-shared object, we can't use .got.plt, which
3051 contains the real function address if we need pointer
3052 equality. We load the GOT entry with the PLT entry. */
3053 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
3054 bfd_put_NN (output_bfd
, (plt
->output_section
->vma
3055 + plt
->output_offset
3057 htab
->elf
.sgot
->contents
3058 + (h
->got
.offset
& ~(bfd_vma
) 1));
3062 else if (bfd_link_pic (info
)
3063 && SYMBOL_REFERENCES_LOCAL (info
, h
))
3065 /* If this is a local symbol reference, we just want to emit
3066 a RELATIVE reloc. This can happen if it is a -Bsymbolic link,
3067 or a pie link, or the symbol was forced to be local because
3068 of a version file. The entry in the global offset table will
3069 already have been initialized in the relocate_section function. */
3070 BFD_ASSERT ((h
->got
.offset
& 1) != 0);
3071 asection
*sec
= h
->root
.u
.def
.section
;
3072 rela
.r_info
= ELFNN_R_INFO (0, R_RISCV_RELATIVE
);
3073 rela
.r_addend
= (h
->root
.u
.def
.value
3074 + sec
->output_section
->vma
3075 + sec
->output_offset
);
3079 BFD_ASSERT ((h
->got
.offset
& 1) == 0);
3080 BFD_ASSERT (h
->dynindx
!= -1);
3081 rela
.r_info
= ELFNN_R_INFO (h
->dynindx
, R_RISCV_NN
);
3085 bfd_put_NN (output_bfd
, 0,
3086 sgot
->contents
+ (h
->got
.offset
& ~(bfd_vma
) 1));
3088 if (use_elf_append_rela
)
3089 riscv_elf_append_rela (output_bfd
, srela
, &rela
);
3092 /* Use riscv_elf_append_rela to add the dynamic relocs into
3093 .rela.iplt may cause the overwrite problems. Since we insert
3094 the relocs for PLT didn't handle the reloc_index of .rela.iplt,
3095 but the riscv_elf_append_rela adds the relocs to the place
3096 that are calculated from the reloc_index (in seqential).
3098 One solution is that add these dynamic relocs (GOT IFUNC)
3099 from the last of .rela.iplt section. */
3100 bfd_vma iplt_idx
= htab
->last_iplt_index
--;
3101 bfd_byte
*loc
= srela
->contents
3102 + iplt_idx
* sizeof (ElfNN_External_Rela
);
3103 bed
->s
->swap_reloca_out (output_bfd
, &rela
, loc
);
3109 Elf_Internal_Rela rela
;
3112 /* This symbols needs a copy reloc. Set it up. */
3113 BFD_ASSERT (h
->dynindx
!= -1);
3115 rela
.r_offset
= sec_addr (h
->root
.u
.def
.section
) + h
->root
.u
.def
.value
;
3116 rela
.r_info
= ELFNN_R_INFO (h
->dynindx
, R_RISCV_COPY
);
3118 if (h
->root
.u
.def
.section
== htab
->elf
.sdynrelro
)
3119 s
= htab
->elf
.sreldynrelro
;
3121 s
= htab
->elf
.srelbss
;
3122 riscv_elf_append_rela (output_bfd
, s
, &rela
);
3125 /* Mark some specially defined symbols as absolute. */
3126 if (h
== htab
->elf
.hdynamic
3127 || (h
== htab
->elf
.hgot
|| h
== htab
->elf
.hplt
))
3128 sym
->st_shndx
= SHN_ABS
;
3133 /* Finish up local dynamic symbol handling. We set the contents of
3134 various dynamic sections here. */
3137 riscv_elf_finish_local_dynamic_symbol (void **slot
, void *inf
)
3139 struct elf_link_hash_entry
*h
= (struct elf_link_hash_entry
*) *slot
;
3140 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
3142 return riscv_elf_finish_dynamic_symbol (info
->output_bfd
, info
, h
, NULL
);
3145 /* Finish up the dynamic sections. */
3148 riscv_finish_dyn (bfd
*output_bfd
, struct bfd_link_info
*info
,
3149 bfd
*dynobj
, asection
*sdyn
)
3151 struct riscv_elf_link_hash_table
*htab
= riscv_elf_hash_table (info
);
3152 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
3153 size_t dynsize
= bed
->s
->sizeof_dyn
;
3154 bfd_byte
*dyncon
, *dynconend
;
3156 dynconend
= sdyn
->contents
+ sdyn
->size
;
3157 for (dyncon
= sdyn
->contents
; dyncon
< dynconend
; dyncon
+= dynsize
)
3159 Elf_Internal_Dyn dyn
;
3162 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
3167 s
= htab
->elf
.sgotplt
;
3168 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
3171 s
= htab
->elf
.srelplt
;
3172 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
3175 s
= htab
->elf
.srelplt
;
3176 dyn
.d_un
.d_val
= s
->size
;
3182 bed
->s
->swap_dyn_out (output_bfd
, &dyn
, dyncon
);
3188 riscv_elf_finish_dynamic_sections (bfd
*output_bfd
,
3189 struct bfd_link_info
*info
)
3193 struct riscv_elf_link_hash_table
*htab
;
3195 htab
= riscv_elf_hash_table (info
);
3196 BFD_ASSERT (htab
!= NULL
);
3197 dynobj
= htab
->elf
.dynobj
;
3199 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
3201 if (elf_hash_table (info
)->dynamic_sections_created
)
3206 splt
= htab
->elf
.splt
;
3207 BFD_ASSERT (splt
!= NULL
&& sdyn
!= NULL
);
3209 ret
= riscv_finish_dyn (output_bfd
, info
, dynobj
, sdyn
);
3214 /* Fill in the head and tail entries in the procedure linkage table. */
3218 uint32_t plt_header
[PLT_HEADER_INSNS
];
3219 ret
= riscv_make_plt_header (output_bfd
,
3220 sec_addr (htab
->elf
.sgotplt
),
3221 sec_addr (splt
), plt_header
);
3225 for (i
= 0; i
< PLT_HEADER_INSNS
; i
++)
3226 bfd_putl32 (plt_header
[i
], splt
->contents
+ 4*i
);
3228 elf_section_data (splt
->output_section
)->this_hdr
.sh_entsize
3233 if (htab
->elf
.sgotplt
)
3235 asection
*output_section
= htab
->elf
.sgotplt
->output_section
;
3237 if (bfd_is_abs_section (output_section
))
3239 (*_bfd_error_handler
)
3240 (_("discarded output section: `%pA'"), htab
->elf
.sgotplt
);
3244 if (htab
->elf
.sgotplt
->size
> 0)
3246 /* Write the first two entries in .got.plt, needed for the dynamic
3248 bfd_put_NN (output_bfd
, (bfd_vma
) -1, htab
->elf
.sgotplt
->contents
);
3249 bfd_put_NN (output_bfd
, (bfd_vma
) 0,
3250 htab
->elf
.sgotplt
->contents
+ GOT_ENTRY_SIZE
);
3253 elf_section_data (output_section
)->this_hdr
.sh_entsize
= GOT_ENTRY_SIZE
;
3258 asection
*output_section
= htab
->elf
.sgot
->output_section
;
3260 if (htab
->elf
.sgot
->size
> 0)
3262 /* Set the first entry in the global offset table to the address of
3263 the dynamic section. */
3264 bfd_vma val
= sdyn
? sec_addr (sdyn
) : 0;
3265 bfd_put_NN (output_bfd
, val
, htab
->elf
.sgot
->contents
);
3268 elf_section_data (output_section
)->this_hdr
.sh_entsize
= GOT_ENTRY_SIZE
;
3271 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
3272 htab_traverse (htab
->loc_hash_table
,
3273 riscv_elf_finish_local_dynamic_symbol
,
3279 /* Return address for Ith PLT stub in section PLT, for relocation REL
3280 or (bfd_vma) -1 if it should not be included. */
3283 riscv_elf_plt_sym_val (bfd_vma i
, const asection
*plt
,
3284 const arelent
*rel ATTRIBUTE_UNUSED
)
3286 return plt
->vma
+ PLT_HEADER_SIZE
+ i
* PLT_ENTRY_SIZE
;
3289 static enum elf_reloc_type_class
3290 riscv_reloc_type_class (const struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
3291 const asection
*rel_sec ATTRIBUTE_UNUSED
,
3292 const Elf_Internal_Rela
*rela
)
3294 switch (ELFNN_R_TYPE (rela
->r_info
))
3296 case R_RISCV_RELATIVE
:
3297 return reloc_class_relative
;
3298 case R_RISCV_JUMP_SLOT
:
3299 return reloc_class_plt
;
3301 return reloc_class_copy
;
3303 return reloc_class_normal
;
3307 /* Given the ELF header flags in FLAGS, it returns a string that describes the
3311 riscv_float_abi_string (flagword flags
)
3313 switch (flags
& EF_RISCV_FLOAT_ABI
)
3315 case EF_RISCV_FLOAT_ABI_SOFT
:
3316 return "soft-float";
3318 case EF_RISCV_FLOAT_ABI_SINGLE
:
3319 return "single-float";
3321 case EF_RISCV_FLOAT_ABI_DOUBLE
:
3322 return "double-float";
3324 case EF_RISCV_FLOAT_ABI_QUAD
:
3325 return "quad-float";
3332 /* The information of architecture elf attributes. */
3333 static riscv_subset_list_t in_subsets
;
3334 static riscv_subset_list_t out_subsets
;
3335 static riscv_subset_list_t merged_subsets
;
3337 /* Predicator for standard extension. */
3340 riscv_std_ext_p (const char *name
)
3342 return (strlen (name
) == 1) && (name
[0] != 'x') && (name
[0] != 's');
3345 /* Update the output subset's version to match the input when the input
3346 subset's version is newer. */
3349 riscv_update_subset_version (struct riscv_subset_t
*in
,
3350 struct riscv_subset_t
*out
)
3352 if (in
== NULL
|| out
== NULL
)
3355 /* Update the output ISA versions to the newest ones, but otherwise don't
3356 provide any errors or warnings about mis-matched ISA versions as it's
3357 generally too tricky to check for these at link time. */
3358 if ((in
->major_version
> out
->major_version
)
3359 || (in
->major_version
== out
->major_version
3360 && in
->minor_version
> out
->minor_version
)
3361 || (out
->major_version
== RISCV_UNKNOWN_VERSION
))
3363 out
->major_version
= in
->major_version
;
3364 out
->minor_version
= in
->minor_version
;
3368 /* Return true if subset is 'i' or 'e'. */
3371 riscv_i_or_e_p (bfd
*ibfd
,
3373 struct riscv_subset_t
*subset
)
3375 if ((strcasecmp (subset
->name
, "e") != 0)
3376 && (strcasecmp (subset
->name
, "i") != 0))
3379 (_("error: %pB: corrupted ISA string '%s'. "
3380 "First letter should be 'i' or 'e' but got '%s'"),
3381 ibfd
, arch
, subset
->name
);
3387 /* Merge standard extensions.
3390 Return FALSE if failed to merge.
3394 `in_arch`: Raw ISA string for input object.
3395 `out_arch`: Raw ISA string for output object.
3396 `pin`: Subset list for input object.
3397 `pout`: Subset list for output object. */
3400 riscv_merge_std_ext (bfd
*ibfd
,
3401 const char *in_arch
,
3402 const char *out_arch
,
3403 struct riscv_subset_t
**pin
,
3404 struct riscv_subset_t
**pout
)
3406 const char *standard_exts
= "mafdqlcbjtpvn";
3408 struct riscv_subset_t
*in
= *pin
;
3409 struct riscv_subset_t
*out
= *pout
;
3411 /* First letter should be 'i' or 'e'. */
3412 if (!riscv_i_or_e_p (ibfd
, in_arch
, in
))
3415 if (!riscv_i_or_e_p (ibfd
, out_arch
, out
))
3418 if (strcasecmp (in
->name
, out
->name
) != 0)
3420 /* TODO: We might allow merge 'i' with 'e'. */
3422 (_("error: %pB: mis-matched ISA string to merge '%s' and '%s'"),
3423 ibfd
, in
->name
, out
->name
);
3427 riscv_update_subset_version(in
, out
);
3428 riscv_add_subset (&merged_subsets
,
3429 out
->name
, out
->major_version
, out
->minor_version
);
3434 /* Handle standard extension first. */
3435 for (p
= standard_exts
; *p
; ++p
)
3437 struct riscv_subset_t
*ext_in
, *ext_out
, *ext_merged
;
3438 char find_ext
[2] = {*p
, '\0'};
3439 bool find_in
, find_out
;
3441 find_in
= riscv_lookup_subset (&in_subsets
, find_ext
, &ext_in
);
3442 find_out
= riscv_lookup_subset (&out_subsets
, find_ext
, &ext_out
);
3444 if (!find_in
&& !find_out
)
3447 if (find_in
&& find_out
)
3448 riscv_update_subset_version(ext_in
, ext_out
);
3450 ext_merged
= find_out
? ext_out
: ext_in
;
3451 riscv_add_subset (&merged_subsets
, ext_merged
->name
,
3452 ext_merged
->major_version
, ext_merged
->minor_version
);
3455 /* Skip all standard extensions. */
3456 while ((in
!= NULL
) && riscv_std_ext_p (in
->name
)) in
= in
->next
;
3457 while ((out
!= NULL
) && riscv_std_ext_p (out
->name
)) out
= out
->next
;
3465 /* Merge multi letter extensions. PIN is a pointer to the head of the input
3466 object subset list. Likewise for POUT and the output object. Return TRUE
3467 on success and FALSE when a conflict is found. */
3470 riscv_merge_multi_letter_ext (riscv_subset_t
**pin
,
3471 riscv_subset_t
**pout
)
3473 riscv_subset_t
*in
= *pin
;
3474 riscv_subset_t
*out
= *pout
;
3475 riscv_subset_t
*tail
;
3481 cmp
= riscv_compare_subsets (in
->name
, out
->name
);
3485 /* `in' comes before `out', append `in' and increment. */
3486 riscv_add_subset (&merged_subsets
, in
->name
, in
->major_version
,
3492 /* `out' comes before `in', append `out' and increment. */
3493 riscv_add_subset (&merged_subsets
, out
->name
, out
->major_version
,
3494 out
->minor_version
);
3499 /* Both present, check version and increment both. */
3500 riscv_update_subset_version (in
, out
);
3502 riscv_add_subset (&merged_subsets
, out
->name
, out
->major_version
,
3503 out
->minor_version
);
3511 /* If we're here, either `in' or `out' is running longer than
3512 the other. So, we need to append the corresponding tail. */
3513 tail
= in
? in
: out
;
3516 riscv_add_subset (&merged_subsets
, tail
->name
, tail
->major_version
,
3517 tail
->minor_version
);
3525 /* Merge Tag_RISCV_arch attribute. */
3528 riscv_merge_arch_attr_info (bfd
*ibfd
, char *in_arch
, char *out_arch
)
3530 riscv_subset_t
*in
, *out
;
3531 char *merged_arch_str
;
3533 unsigned xlen_in
, xlen_out
;
3534 merged_subsets
.head
= NULL
;
3535 merged_subsets
.tail
= NULL
;
3537 riscv_parse_subset_t riscv_rps_ld_in
=
3538 {&in_subsets
, _bfd_error_handler
, &xlen_in
, NULL
, false};
3539 riscv_parse_subset_t riscv_rps_ld_out
=
3540 {&out_subsets
, _bfd_error_handler
, &xlen_out
, NULL
, false};
3542 if (in_arch
== NULL
&& out_arch
== NULL
)
3544 if (in_arch
== NULL
&& out_arch
!= NULL
)
3546 if (in_arch
!= NULL
&& out_arch
== NULL
)
3549 /* Parse subset from ISA string. */
3550 if (!riscv_parse_subset (&riscv_rps_ld_in
, in_arch
))
3552 if (!riscv_parse_subset (&riscv_rps_ld_out
, out_arch
))
3555 /* Checking XLEN. */
3556 if (xlen_out
!= xlen_in
)
3559 (_("error: %pB: ISA string of input (%s) doesn't match "
3560 "output (%s)"), ibfd
, in_arch
, out_arch
);
3564 /* Merge subset list. */
3565 in
= in_subsets
.head
;
3566 out
= out_subsets
.head
;
3568 /* Merge standard extension. */
3569 if (!riscv_merge_std_ext (ibfd
, in_arch
, out_arch
, &in
, &out
))
3572 /* Merge all non-single letter extensions with single call. */
3573 if (!riscv_merge_multi_letter_ext (&in
, &out
))
3576 if (xlen_in
!= xlen_out
)
3579 (_("error: %pB: XLEN of input (%u) doesn't match "
3580 "output (%u)"), ibfd
, xlen_in
, xlen_out
);
3584 if (xlen_in
!= ARCH_SIZE
)
3587 (_("error: %pB: unsupported XLEN (%u), you might be "
3588 "using wrong emulation"), ibfd
, xlen_in
);
3592 merged_arch_str
= riscv_arch_str (ARCH_SIZE
, &merged_subsets
);
3594 /* Release the subset lists. */
3595 riscv_release_subset_list (&in_subsets
);
3596 riscv_release_subset_list (&out_subsets
);
3597 riscv_release_subset_list (&merged_subsets
);
3599 return merged_arch_str
;
3602 /* Merge object attributes from IBFD into output_bfd of INFO.
3603 Raise an error if there are conflicting attributes. */
3606 riscv_merge_attributes (bfd
*ibfd
, struct bfd_link_info
*info
)
3608 bfd
*obfd
= info
->output_bfd
;
3609 obj_attribute
*in_attr
;
3610 obj_attribute
*out_attr
;
3612 bool priv_attrs_merged
= false;
3613 const char *sec_name
= get_elf_backend_data (ibfd
)->obj_attrs_section
;
3616 /* Skip linker created files. */
3617 if (ibfd
->flags
& BFD_LINKER_CREATED
)
3620 /* Skip any input that doesn't have an attribute section.
3621 This enables to link object files without attribute section with
3623 if (bfd_get_section_by_name (ibfd
, sec_name
) == NULL
)
3626 if (!elf_known_obj_attributes_proc (obfd
)[0].i
)
3628 /* This is the first object. Copy the attributes. */
3629 _bfd_elf_copy_obj_attributes (ibfd
, obfd
);
3631 out_attr
= elf_known_obj_attributes_proc (obfd
);
3633 /* Use the Tag_null value to indicate the attributes have been
3640 in_attr
= elf_known_obj_attributes_proc (ibfd
);
3641 out_attr
= elf_known_obj_attributes_proc (obfd
);
3643 for (i
= LEAST_KNOWN_OBJ_ATTRIBUTE
; i
< NUM_KNOWN_OBJ_ATTRIBUTES
; i
++)
3647 case Tag_RISCV_arch
:
3648 if (!out_attr
[Tag_RISCV_arch
].s
)
3649 out_attr
[Tag_RISCV_arch
].s
= in_attr
[Tag_RISCV_arch
].s
;
3650 else if (in_attr
[Tag_RISCV_arch
].s
3651 && out_attr
[Tag_RISCV_arch
].s
)
3653 /* Check compatible. */
3655 riscv_merge_arch_attr_info (ibfd
,
3656 in_attr
[Tag_RISCV_arch
].s
,
3657 out_attr
[Tag_RISCV_arch
].s
);
3658 if (merged_arch
== NULL
)
3661 out_attr
[Tag_RISCV_arch
].s
= "";
3664 out_attr
[Tag_RISCV_arch
].s
= merged_arch
;
3668 case Tag_RISCV_priv_spec
:
3669 case Tag_RISCV_priv_spec_minor
:
3670 case Tag_RISCV_priv_spec_revision
:
3671 /* If we have handled the privileged elf attributes, then skip it. */
3672 if (!priv_attrs_merged
)
3674 unsigned int Tag_a
= Tag_RISCV_priv_spec
;
3675 unsigned int Tag_b
= Tag_RISCV_priv_spec_minor
;
3676 unsigned int Tag_c
= Tag_RISCV_priv_spec_revision
;
3677 enum riscv_spec_class in_priv_spec
= PRIV_SPEC_CLASS_NONE
;
3678 enum riscv_spec_class out_priv_spec
= PRIV_SPEC_CLASS_NONE
;
3680 /* Get the privileged spec class from elf attributes. */
3681 riscv_get_priv_spec_class_from_numbers (in_attr
[Tag_a
].i
,
3685 riscv_get_priv_spec_class_from_numbers (out_attr
[Tag_a
].i
,
3690 /* Allow to link the object without the privileged specs. */
3691 if (out_priv_spec
== PRIV_SPEC_CLASS_NONE
)
3693 out_attr
[Tag_a
].i
= in_attr
[Tag_a
].i
;
3694 out_attr
[Tag_b
].i
= in_attr
[Tag_b
].i
;
3695 out_attr
[Tag_c
].i
= in_attr
[Tag_c
].i
;
3697 else if (in_priv_spec
!= PRIV_SPEC_CLASS_NONE
3698 && in_priv_spec
!= out_priv_spec
)
3701 (_("warning: %pB use privileged spec version %u.%u.%u but "
3702 "the output use version %u.%u.%u"),
3711 /* The privileged spec v1.9.1 can not be linked with others
3712 since the conflicts, so we plan to drop it in a year or
3714 if (in_priv_spec
== PRIV_SPEC_CLASS_1P9P1
3715 || out_priv_spec
== PRIV_SPEC_CLASS_1P9P1
)
3718 (_("warning: privileged spec version 1.9.1 can not be "
3719 "linked with other spec versions"));
3722 /* Update the output privileged spec to the newest one. */
3723 if (in_priv_spec
> out_priv_spec
)
3725 out_attr
[Tag_a
].i
= in_attr
[Tag_a
].i
;
3726 out_attr
[Tag_b
].i
= in_attr
[Tag_b
].i
;
3727 out_attr
[Tag_c
].i
= in_attr
[Tag_c
].i
;
3730 priv_attrs_merged
= true;
3734 case Tag_RISCV_unaligned_access
:
3735 out_attr
[i
].i
|= in_attr
[i
].i
;
3738 case Tag_RISCV_stack_align
:
3739 if (out_attr
[i
].i
== 0)
3740 out_attr
[i
].i
= in_attr
[i
].i
;
3741 else if (in_attr
[i
].i
!= 0
3742 && out_attr
[i
].i
!= 0
3743 && out_attr
[i
].i
!= in_attr
[i
].i
)
3746 (_("error: %pB use %u-byte stack aligned but the output "
3747 "use %u-byte stack aligned"),
3748 ibfd
, in_attr
[i
].i
, out_attr
[i
].i
);
3754 result
&= _bfd_elf_merge_unknown_attribute_low (ibfd
, obfd
, i
);
3757 /* If out_attr was copied from in_attr then it won't have a type yet. */
3758 if (in_attr
[i
].type
&& !out_attr
[i
].type
)
3759 out_attr
[i
].type
= in_attr
[i
].type
;
3762 /* Merge Tag_compatibility attributes and any common GNU ones. */
3763 if (!_bfd_elf_merge_object_attributes (ibfd
, info
))
3766 /* Check for any attributes not known on RISC-V. */
3767 result
&= _bfd_elf_merge_unknown_attribute_list (ibfd
, obfd
);
3772 /* Merge backend specific data from an object file to the output
3773 object file when linking. */
3776 _bfd_riscv_elf_merge_private_bfd_data (bfd
*ibfd
, struct bfd_link_info
*info
)
3778 bfd
*obfd
= info
->output_bfd
;
3779 flagword new_flags
, old_flags
;
3781 if (!is_riscv_elf (ibfd
) || !is_riscv_elf (obfd
))
3784 if (strcmp (bfd_get_target (ibfd
), bfd_get_target (obfd
)) != 0)
3786 (*_bfd_error_handler
)
3787 (_("%pB: ABI is incompatible with that of the selected emulation:\n"
3788 " target emulation `%s' does not match `%s'"),
3789 ibfd
, bfd_get_target (ibfd
), bfd_get_target (obfd
));
3793 if (!_bfd_elf_merge_object_attributes (ibfd
, info
))
3796 if (!riscv_merge_attributes (ibfd
, info
))
3799 /* Check to see if the input BFD actually contains any sections. If not,
3800 its flags may not have been initialized either, but it cannot actually
3801 cause any incompatibility. Do not short-circuit dynamic objects; their
3802 section list may be emptied by elf_link_add_object_symbols.
3804 Also check to see if there are no code sections in the input. In this
3805 case, there is no need to check for code specific flags. */
3806 if (!(ibfd
->flags
& DYNAMIC
))
3808 bool null_input_bfd
= true;
3809 bool only_data_sections
= true;
3812 for (sec
= ibfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
3814 null_input_bfd
= false;
3816 if ((bfd_section_flags (sec
)
3817 & (SEC_LOAD
| SEC_CODE
| SEC_HAS_CONTENTS
))
3818 == (SEC_LOAD
| SEC_CODE
| SEC_HAS_CONTENTS
))
3820 only_data_sections
= false;
3825 if (null_input_bfd
|| only_data_sections
)
3829 new_flags
= elf_elfheader (ibfd
)->e_flags
;
3830 old_flags
= elf_elfheader (obfd
)->e_flags
;
3832 if (!elf_flags_init (obfd
))
3834 elf_flags_init (obfd
) = true;
3835 elf_elfheader (obfd
)->e_flags
= new_flags
;
3839 /* Disallow linking different float ABIs. */
3840 if ((old_flags
^ new_flags
) & EF_RISCV_FLOAT_ABI
)
3842 (*_bfd_error_handler
)
3843 (_("%pB: can't link %s modules with %s modules"), ibfd
,
3844 riscv_float_abi_string (new_flags
),
3845 riscv_float_abi_string (old_flags
));
3849 /* Disallow linking RVE and non-RVE. */
3850 if ((old_flags
^ new_flags
) & EF_RISCV_RVE
)
3852 (*_bfd_error_handler
)
3853 (_("%pB: can't link RVE with other target"), ibfd
);
3857 /* Allow linking RVC and non-RVC, and keep the RVC flag. */
3858 elf_elfheader (obfd
)->e_flags
|= new_flags
& EF_RISCV_RVC
;
3863 bfd_set_error (bfd_error_bad_value
);
3867 /* A second format for recording PC-relative hi relocations. This stores the
3868 information required to relax them to GP-relative addresses. */
3870 typedef struct riscv_pcgp_hi_reloc riscv_pcgp_hi_reloc
;
3871 struct riscv_pcgp_hi_reloc
3878 bool undefined_weak
;
3879 riscv_pcgp_hi_reloc
*next
;
3882 typedef struct riscv_pcgp_lo_reloc riscv_pcgp_lo_reloc
;
3883 struct riscv_pcgp_lo_reloc
3886 riscv_pcgp_lo_reloc
*next
;
3891 riscv_pcgp_hi_reloc
*hi
;
3892 riscv_pcgp_lo_reloc
*lo
;
3893 } riscv_pcgp_relocs
;
3895 /* Initialize the pcgp reloc info in P. */
3898 riscv_init_pcgp_relocs (riscv_pcgp_relocs
*p
)
3905 /* Free the pcgp reloc info in P. */
3908 riscv_free_pcgp_relocs (riscv_pcgp_relocs
*p
,
3909 bfd
*abfd ATTRIBUTE_UNUSED
,
3910 asection
*sec ATTRIBUTE_UNUSED
)
3912 riscv_pcgp_hi_reloc
*c
;
3913 riscv_pcgp_lo_reloc
*l
;
3915 for (c
= p
->hi
; c
!= NULL
; )
3917 riscv_pcgp_hi_reloc
*next
= c
->next
;
3922 for (l
= p
->lo
; l
!= NULL
; )
3924 riscv_pcgp_lo_reloc
*next
= l
->next
;
3930 /* Record pcgp hi part reloc info in P, using HI_SEC_OFF as the lookup index.
3931 The HI_ADDEND, HI_ADDR, HI_SYM, and SYM_SEC args contain info required to
3932 relax the corresponding lo part reloc. */
3935 riscv_record_pcgp_hi_reloc (riscv_pcgp_relocs
*p
, bfd_vma hi_sec_off
,
3936 bfd_vma hi_addend
, bfd_vma hi_addr
,
3937 unsigned hi_sym
, asection
*sym_sec
,
3938 bool undefined_weak
)
3940 riscv_pcgp_hi_reloc
*new = bfd_malloc (sizeof (*new));
3943 new->hi_sec_off
= hi_sec_off
;
3944 new->hi_addend
= hi_addend
;
3945 new->hi_addr
= hi_addr
;
3946 new->hi_sym
= hi_sym
;
3947 new->sym_sec
= sym_sec
;
3948 new->undefined_weak
= undefined_weak
;
3954 /* Look up hi part pcgp reloc info in P, using HI_SEC_OFF as the lookup index.
3955 This is used by a lo part reloc to find the corresponding hi part reloc. */
3957 static riscv_pcgp_hi_reloc
*
3958 riscv_find_pcgp_hi_reloc (riscv_pcgp_relocs
*p
, bfd_vma hi_sec_off
)
3960 riscv_pcgp_hi_reloc
*c
;
3962 for (c
= p
->hi
; c
!= NULL
; c
= c
->next
)
3963 if (c
->hi_sec_off
== hi_sec_off
)
3968 /* Record pcgp lo part reloc info in P, using HI_SEC_OFF as the lookup info.
3969 This is used to record relocs that can't be relaxed. */
3972 riscv_record_pcgp_lo_reloc (riscv_pcgp_relocs
*p
, bfd_vma hi_sec_off
)
3974 riscv_pcgp_lo_reloc
*new = bfd_malloc (sizeof (*new));
3977 new->hi_sec_off
= hi_sec_off
;
3983 /* Look up lo part pcgp reloc info in P, using HI_SEC_OFF as the lookup index.
3984 This is used by a hi part reloc to find the corresponding lo part reloc. */
3987 riscv_find_pcgp_lo_reloc (riscv_pcgp_relocs
*p
, bfd_vma hi_sec_off
)
3989 riscv_pcgp_lo_reloc
*c
;
3991 for (c
= p
->lo
; c
!= NULL
; c
= c
->next
)
3992 if (c
->hi_sec_off
== hi_sec_off
)
3998 riscv_update_pcgp_relocs (riscv_pcgp_relocs
*p
, asection
*deleted_sec
,
3999 bfd_vma deleted_addr
, size_t deleted_count
)
4001 /* Bytes have already been deleted and toaddr should match the old section
4002 size for our checks, so adjust it here. */
4003 bfd_vma toaddr
= deleted_sec
->size
+ deleted_count
;
4004 riscv_pcgp_lo_reloc
*l
;
4005 riscv_pcgp_hi_reloc
*h
;
4007 /* Update section offsets of corresponding pcrel_hi relocs for the pcrel_lo
4008 entries where they occur after the deleted bytes. */
4009 for (l
= p
->lo
; l
!= NULL
; l
= l
->next
)
4010 if (l
->hi_sec_off
> deleted_addr
4011 && l
->hi_sec_off
< toaddr
)
4012 l
->hi_sec_off
-= deleted_count
;
4014 /* Update both section offsets, and symbol values of pcrel_hi relocs where
4015 these values occur after the deleted bytes. */
4016 for (h
= p
->hi
; h
!= NULL
; h
= h
->next
)
4018 if (h
->hi_sec_off
> deleted_addr
4019 && h
->hi_sec_off
< toaddr
)
4020 h
->hi_sec_off
-= deleted_count
;
4021 if (h
->sym_sec
== deleted_sec
4022 && h
->hi_addr
> deleted_addr
4023 && h
->hi_addr
< toaddr
)
4024 h
->hi_addr
-= deleted_count
;
4028 /* Delete some bytes from a section while relaxing. */
4031 riscv_relax_delete_bytes (bfd
*abfd
,
4035 struct bfd_link_info
*link_info
,
4036 riscv_pcgp_relocs
*p
)
4038 unsigned int i
, symcount
;
4039 bfd_vma toaddr
= sec
->size
;
4040 struct elf_link_hash_entry
**sym_hashes
= elf_sym_hashes (abfd
);
4041 Elf_Internal_Shdr
*symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
4042 unsigned int sec_shndx
= _bfd_elf_section_from_bfd_section (abfd
, sec
);
4043 struct bfd_elf_section_data
*data
= elf_section_data (sec
);
4044 bfd_byte
*contents
= data
->this_hdr
.contents
;
4046 /* Actually delete the bytes. */
4048 memmove (contents
+ addr
, contents
+ addr
+ count
, toaddr
- addr
- count
);
4050 /* Adjust the location of all of the relocs. Note that we need not
4051 adjust the addends, since all PC-relative references must be against
4052 symbols, which we will adjust below. */
4053 for (i
= 0; i
< sec
->reloc_count
; i
++)
4054 if (data
->relocs
[i
].r_offset
> addr
&& data
->relocs
[i
].r_offset
< toaddr
)
4055 data
->relocs
[i
].r_offset
-= count
;
4057 /* Adjust the hi_sec_off, and the hi_addr of any entries in the pcgp relocs
4058 table for which these values occur after the deleted bytes. */
4060 riscv_update_pcgp_relocs (p
, sec
, addr
, count
);
4062 /* Adjust the local symbols defined in this section. */
4063 for (i
= 0; i
< symtab_hdr
->sh_info
; i
++)
4065 Elf_Internal_Sym
*sym
= (Elf_Internal_Sym
*) symtab_hdr
->contents
+ i
;
4066 if (sym
->st_shndx
== sec_shndx
)
4068 /* If the symbol is in the range of memory we just moved, we
4069 have to adjust its value. */
4070 if (sym
->st_value
> addr
&& sym
->st_value
<= toaddr
)
4071 sym
->st_value
-= count
;
4073 /* If the symbol *spans* the bytes we just deleted (i.e. its
4074 *end* is in the moved bytes but its *start* isn't), then we
4075 must adjust its size.
4077 This test needs to use the original value of st_value, otherwise
4078 we might accidentally decrease size when deleting bytes right
4079 before the symbol. But since deleted relocs can't span across
4080 symbols, we can't have both a st_value and a st_size decrease,
4081 so it is simpler to just use an else. */
4082 else if (sym
->st_value
<= addr
4083 && sym
->st_value
+ sym
->st_size
> addr
4084 && sym
->st_value
+ sym
->st_size
<= toaddr
)
4085 sym
->st_size
-= count
;
4089 /* Now adjust the global symbols defined in this section. */
4090 symcount
= ((symtab_hdr
->sh_size
/ sizeof (ElfNN_External_Sym
))
4091 - symtab_hdr
->sh_info
);
4093 for (i
= 0; i
< symcount
; i
++)
4095 struct elf_link_hash_entry
*sym_hash
= sym_hashes
[i
];
4097 /* The '--wrap SYMBOL' option is causing a pain when the object file,
4098 containing the definition of __wrap_SYMBOL, includes a direct
4099 call to SYMBOL as well. Since both __wrap_SYMBOL and SYMBOL reference
4100 the same symbol (which is __wrap_SYMBOL), but still exist as two
4101 different symbols in 'sym_hashes', we don't want to adjust
4102 the global symbol __wrap_SYMBOL twice.
4104 The same problem occurs with symbols that are versioned_hidden, as
4105 foo becomes an alias for foo@BAR, and hence they need the same
4107 if (link_info
->wrap_hash
!= NULL
4108 || sym_hash
->versioned
!= unversioned
)
4110 struct elf_link_hash_entry
**cur_sym_hashes
;
4112 /* Loop only over the symbols which have already been checked. */
4113 for (cur_sym_hashes
= sym_hashes
; cur_sym_hashes
< &sym_hashes
[i
];
4116 /* If the current symbol is identical to 'sym_hash', that means
4117 the symbol was already adjusted (or at least checked). */
4118 if (*cur_sym_hashes
== sym_hash
)
4121 /* Don't adjust the symbol again. */
4122 if (cur_sym_hashes
< &sym_hashes
[i
])
4126 if ((sym_hash
->root
.type
== bfd_link_hash_defined
4127 || sym_hash
->root
.type
== bfd_link_hash_defweak
)
4128 && sym_hash
->root
.u
.def
.section
== sec
)
4130 /* As above, adjust the value if needed. */
4131 if (sym_hash
->root
.u
.def
.value
> addr
4132 && sym_hash
->root
.u
.def
.value
<= toaddr
)
4133 sym_hash
->root
.u
.def
.value
-= count
;
4135 /* As above, adjust the size if needed. */
4136 else if (sym_hash
->root
.u
.def
.value
<= addr
4137 && sym_hash
->root
.u
.def
.value
+ sym_hash
->size
> addr
4138 && sym_hash
->root
.u
.def
.value
+ sym_hash
->size
<= toaddr
)
4139 sym_hash
->size
-= count
;
4146 typedef bool (*relax_func_t
) (bfd
*, asection
*, asection
*,
4147 struct bfd_link_info
*,
4148 Elf_Internal_Rela
*,
4149 bfd_vma
, bfd_vma
, bfd_vma
, bool *,
4150 riscv_pcgp_relocs
*,
4151 bool undefined_weak
);
4153 /* Relax AUIPC + JALR into JAL. */
4156 _bfd_riscv_relax_call (bfd
*abfd
, asection
*sec
, asection
*sym_sec
,
4157 struct bfd_link_info
*link_info
,
4158 Elf_Internal_Rela
*rel
,
4160 bfd_vma max_alignment
,
4161 bfd_vma reserve_size ATTRIBUTE_UNUSED
,
4163 riscv_pcgp_relocs
*pcgp_relocs
,
4164 bool undefined_weak ATTRIBUTE_UNUSED
)
4166 bfd_byte
*contents
= elf_section_data (sec
)->this_hdr
.contents
;
4167 bfd_vma foff
= symval
- (sec_addr (sec
) + rel
->r_offset
);
4168 bool near_zero
= (symval
+ RISCV_IMM_REACH
/ 2) < RISCV_IMM_REACH
;
4169 bfd_vma auipc
, jalr
;
4170 int rd
, r_type
, len
= 4, rvc
= elf_elfheader (abfd
)->e_flags
& EF_RISCV_RVC
;
4172 /* If the call crosses section boundaries, an alignment directive could
4173 cause the PC-relative offset to later increase, so we need to add in the
4174 max alignment of any section inclusive from the call to the target.
4175 Otherwise, we only need to use the alignment of the current section. */
4176 if (VALID_JTYPE_IMM (foff
))
4178 if (sym_sec
->output_section
== sec
->output_section
4179 && sym_sec
->output_section
!= bfd_abs_section_ptr
)
4180 max_alignment
= (bfd_vma
) 1 << sym_sec
->output_section
->alignment_power
;
4181 foff
+= ((bfd_signed_vma
) foff
< 0 ? -max_alignment
: max_alignment
);
4184 /* See if this function call can be shortened. */
4185 if (!VALID_JTYPE_IMM (foff
) && !(!bfd_link_pic (link_info
) && near_zero
))
4188 /* Shorten the function call. */
4189 BFD_ASSERT (rel
->r_offset
+ 8 <= sec
->size
);
4191 auipc
= bfd_getl32 (contents
+ rel
->r_offset
);
4192 jalr
= bfd_getl32 (contents
+ rel
->r_offset
+ 4);
4193 rd
= (jalr
>> OP_SH_RD
) & OP_MASK_RD
;
4194 rvc
= rvc
&& VALID_CJTYPE_IMM (foff
);
4196 /* C.J exists on RV32 and RV64, but C.JAL is RV32-only. */
4197 rvc
= rvc
&& (rd
== 0 || (rd
== X_RA
&& ARCH_SIZE
== 32));
4201 /* Relax to C.J[AL] rd, addr. */
4202 r_type
= R_RISCV_RVC_JUMP
;
4203 auipc
= rd
== 0 ? MATCH_C_J
: MATCH_C_JAL
;
4206 else if (VALID_JTYPE_IMM (foff
))
4208 /* Relax to JAL rd, addr. */
4209 r_type
= R_RISCV_JAL
;
4210 auipc
= MATCH_JAL
| (rd
<< OP_SH_RD
);
4214 /* Near zero, relax to JALR rd, x0, addr. */
4215 r_type
= R_RISCV_LO12_I
;
4216 auipc
= MATCH_JALR
| (rd
<< OP_SH_RD
);
4219 /* Replace the R_RISCV_CALL reloc. */
4220 rel
->r_info
= ELFNN_R_INFO (ELFNN_R_SYM (rel
->r_info
), r_type
);
4221 /* Replace the AUIPC. */
4222 riscv_put_insn (8 * len
, auipc
, contents
+ rel
->r_offset
);
4224 /* Delete unnecessary JALR. */
4226 return riscv_relax_delete_bytes (abfd
, sec
, rel
->r_offset
+ len
, 8 - len
,
4227 link_info
, pcgp_relocs
);
4230 /* Traverse all output sections and return the max alignment. */
4233 _bfd_riscv_get_max_alignment (asection
*sec
)
4235 unsigned int max_alignment_power
= 0;
4238 for (o
= sec
->output_section
->owner
->sections
; o
!= NULL
; o
= o
->next
)
4240 if (o
->alignment_power
> max_alignment_power
)
4241 max_alignment_power
= o
->alignment_power
;
4244 return (bfd_vma
) 1 << max_alignment_power
;
4247 /* Relax non-PIC global variable references to GP-relative references. */
4250 _bfd_riscv_relax_lui (bfd
*abfd
,
4253 struct bfd_link_info
*link_info
,
4254 Elf_Internal_Rela
*rel
,
4256 bfd_vma max_alignment
,
4257 bfd_vma reserve_size
,
4259 riscv_pcgp_relocs
*pcgp_relocs
,
4260 bool undefined_weak
)
4262 bfd_byte
*contents
= elf_section_data (sec
)->this_hdr
.contents
;
4263 bfd_vma gp
= riscv_global_pointer_value (link_info
);
4264 int use_rvc
= elf_elfheader (abfd
)->e_flags
& EF_RISCV_RVC
;
4266 BFD_ASSERT (rel
->r_offset
+ 4 <= sec
->size
);
4270 /* If gp and the symbol are in the same output section, which is not the
4271 abs section, then consider only that output section's alignment. */
4272 struct bfd_link_hash_entry
*h
=
4273 bfd_link_hash_lookup (link_info
->hash
, RISCV_GP_SYMBOL
, false, false,
4275 if (h
->u
.def
.section
->output_section
== sym_sec
->output_section
4276 && sym_sec
->output_section
!= bfd_abs_section_ptr
)
4277 max_alignment
= (bfd_vma
) 1 << sym_sec
->output_section
->alignment_power
;
4280 /* Is the reference in range of x0 or gp?
4281 Valid gp range conservatively because of alignment issue. */
4283 || (VALID_ITYPE_IMM (symval
)
4285 && VALID_ITYPE_IMM (symval
- gp
+ max_alignment
+ reserve_size
))
4287 && VALID_ITYPE_IMM (symval
- gp
- max_alignment
- reserve_size
))))
4289 unsigned sym
= ELFNN_R_SYM (rel
->r_info
);
4290 switch (ELFNN_R_TYPE (rel
->r_info
))
4292 case R_RISCV_LO12_I
:
4295 /* Change the RS1 to zero. */
4296 bfd_vma insn
= bfd_getl32 (contents
+ rel
->r_offset
);
4297 insn
&= ~(OP_MASK_RS1
<< OP_SH_RS1
);
4298 bfd_putl32 (insn
, contents
+ rel
->r_offset
);
4301 rel
->r_info
= ELFNN_R_INFO (sym
, R_RISCV_GPREL_I
);
4304 case R_RISCV_LO12_S
:
4307 /* Change the RS1 to zero. */
4308 bfd_vma insn
= bfd_getl32 (contents
+ rel
->r_offset
);
4309 insn
&= ~(OP_MASK_RS1
<< OP_SH_RS1
);
4310 bfd_putl32 (insn
, contents
+ rel
->r_offset
);
4313 rel
->r_info
= ELFNN_R_INFO (sym
, R_RISCV_GPREL_S
);
4317 /* We can delete the unnecessary LUI and reloc. */
4318 rel
->r_info
= ELFNN_R_INFO (0, R_RISCV_NONE
);
4320 return riscv_relax_delete_bytes (abfd
, sec
, rel
->r_offset
, 4,
4321 link_info
, pcgp_relocs
);
4328 /* Can we relax LUI to C.LUI? Alignment might move the section forward;
4329 account for this assuming page alignment at worst. In the presence of
4330 RELRO segment the linker aligns it by one page size, therefore sections
4331 after the segment can be moved more than one page. */
4334 && ELFNN_R_TYPE (rel
->r_info
) == R_RISCV_HI20
4335 && VALID_CITYPE_LUI_IMM (RISCV_CONST_HIGH_PART (symval
))
4336 && VALID_CITYPE_LUI_IMM (RISCV_CONST_HIGH_PART (symval
)
4337 + (link_info
->relro
? 2 * ELF_MAXPAGESIZE
4338 : ELF_MAXPAGESIZE
)))
4340 /* Replace LUI with C.LUI if legal (i.e., rd != x0 and rd != x2/sp). */
4341 bfd_vma lui
= bfd_getl32 (contents
+ rel
->r_offset
);
4342 unsigned rd
= ((unsigned)lui
>> OP_SH_RD
) & OP_MASK_RD
;
4343 if (rd
== 0 || rd
== X_SP
)
4346 lui
= (lui
& (OP_MASK_RD
<< OP_SH_RD
)) | MATCH_C_LUI
;
4347 bfd_putl32 (lui
, contents
+ rel
->r_offset
);
4349 /* Replace the R_RISCV_HI20 reloc. */
4350 rel
->r_info
= ELFNN_R_INFO (ELFNN_R_SYM (rel
->r_info
), R_RISCV_RVC_LUI
);
4353 return riscv_relax_delete_bytes (abfd
, sec
, rel
->r_offset
+ 2, 2,
4354 link_info
, pcgp_relocs
);
4360 /* Relax non-PIC TLS references to TP-relative references. */
4363 _bfd_riscv_relax_tls_le (bfd
*abfd
,
4365 asection
*sym_sec ATTRIBUTE_UNUSED
,
4366 struct bfd_link_info
*link_info
,
4367 Elf_Internal_Rela
*rel
,
4369 bfd_vma max_alignment ATTRIBUTE_UNUSED
,
4370 bfd_vma reserve_size ATTRIBUTE_UNUSED
,
4372 riscv_pcgp_relocs
*pcgp_relocs
,
4373 bool undefined_weak ATTRIBUTE_UNUSED
)
4375 /* See if this symbol is in range of tp. */
4376 if (RISCV_CONST_HIGH_PART (tpoff (link_info
, symval
)) != 0)
4379 BFD_ASSERT (rel
->r_offset
+ 4 <= sec
->size
);
4380 switch (ELFNN_R_TYPE (rel
->r_info
))
4382 case R_RISCV_TPREL_LO12_I
:
4383 rel
->r_info
= ELFNN_R_INFO (ELFNN_R_SYM (rel
->r_info
), R_RISCV_TPREL_I
);
4386 case R_RISCV_TPREL_LO12_S
:
4387 rel
->r_info
= ELFNN_R_INFO (ELFNN_R_SYM (rel
->r_info
), R_RISCV_TPREL_S
);
4390 case R_RISCV_TPREL_HI20
:
4391 case R_RISCV_TPREL_ADD
:
4392 /* We can delete the unnecessary instruction and reloc. */
4393 rel
->r_info
= ELFNN_R_INFO (0, R_RISCV_NONE
);
4395 return riscv_relax_delete_bytes (abfd
, sec
, rel
->r_offset
, 4, link_info
,
4403 /* Implement R_RISCV_ALIGN by deleting excess alignment NOPs.
4404 Once we've handled an R_RISCV_ALIGN, we can't relax anything else. */
4407 _bfd_riscv_relax_align (bfd
*abfd
, asection
*sec
,
4409 struct bfd_link_info
*link_info
,
4410 Elf_Internal_Rela
*rel
,
4412 bfd_vma max_alignment ATTRIBUTE_UNUSED
,
4413 bfd_vma reserve_size ATTRIBUTE_UNUSED
,
4414 bool *again ATTRIBUTE_UNUSED
,
4415 riscv_pcgp_relocs
*pcgp_relocs ATTRIBUTE_UNUSED
,
4416 bool undefined_weak ATTRIBUTE_UNUSED
)
4418 bfd_byte
*contents
= elf_section_data (sec
)->this_hdr
.contents
;
4419 bfd_vma alignment
= 1, pos
;
4420 while (alignment
<= rel
->r_addend
)
4423 symval
-= rel
->r_addend
;
4424 bfd_vma aligned_addr
= ((symval
- 1) & ~(alignment
- 1)) + alignment
;
4425 bfd_vma nop_bytes
= aligned_addr
- symval
;
4427 /* Once we've handled an R_RISCV_ALIGN, we can't relax anything else. */
4428 sec
->sec_flg0
= true;
4430 /* Make sure there are enough NOPs to actually achieve the alignment. */
4431 if (rel
->r_addend
< nop_bytes
)
4434 (_("%pB(%pA+%#" PRIx64
"): %" PRId64
" bytes required for alignment "
4435 "to %" PRId64
"-byte boundary, but only %" PRId64
" present"),
4436 abfd
, sym_sec
, (uint64_t) rel
->r_offset
,
4437 (int64_t) nop_bytes
, (int64_t) alignment
, (int64_t) rel
->r_addend
);
4438 bfd_set_error (bfd_error_bad_value
);
4442 /* Delete the reloc. */
4443 rel
->r_info
= ELFNN_R_INFO (0, R_RISCV_NONE
);
4445 /* If the number of NOPs is already correct, there's nothing to do. */
4446 if (nop_bytes
== rel
->r_addend
)
4449 /* Write as many RISC-V NOPs as we need. */
4450 for (pos
= 0; pos
< (nop_bytes
& -4); pos
+= 4)
4451 bfd_putl32 (RISCV_NOP
, contents
+ rel
->r_offset
+ pos
);
4453 /* Write a final RVC NOP if need be. */
4454 if (nop_bytes
% 4 != 0)
4455 bfd_putl16 (RVC_NOP
, contents
+ rel
->r_offset
+ pos
);
4457 /* Delete the excess bytes. */
4458 return riscv_relax_delete_bytes (abfd
, sec
, rel
->r_offset
+ nop_bytes
,
4459 rel
->r_addend
- nop_bytes
, link_info
,
4463 /* Relax PC-relative references to GP-relative references. */
4466 _bfd_riscv_relax_pc (bfd
*abfd ATTRIBUTE_UNUSED
,
4469 struct bfd_link_info
*link_info
,
4470 Elf_Internal_Rela
*rel
,
4472 bfd_vma max_alignment
,
4473 bfd_vma reserve_size
,
4474 bool *again ATTRIBUTE_UNUSED
,
4475 riscv_pcgp_relocs
*pcgp_relocs
,
4476 bool undefined_weak
)
4478 bfd_byte
*contents
= elf_section_data (sec
)->this_hdr
.contents
;
4479 bfd_vma gp
= riscv_global_pointer_value (link_info
);
4481 BFD_ASSERT (rel
->r_offset
+ 4 <= sec
->size
);
4483 /* Chain the _LO relocs to their cooresponding _HI reloc to compute the
4484 actual target address. */
4485 riscv_pcgp_hi_reloc hi_reloc
;
4486 memset (&hi_reloc
, 0, sizeof (hi_reloc
));
4487 switch (ELFNN_R_TYPE (rel
->r_info
))
4489 case R_RISCV_PCREL_LO12_I
:
4490 case R_RISCV_PCREL_LO12_S
:
4492 /* If the %lo has an addend, it isn't for the label pointing at the
4493 hi part instruction, but rather for the symbol pointed at by the
4494 hi part instruction. So we must subtract it here for the lookup.
4495 It is still used below in the final symbol address. */
4496 bfd_vma hi_sec_off
= symval
- sec_addr (sym_sec
) - rel
->r_addend
;
4497 riscv_pcgp_hi_reloc
*hi
= riscv_find_pcgp_hi_reloc (pcgp_relocs
,
4501 riscv_record_pcgp_lo_reloc (pcgp_relocs
, hi_sec_off
);
4506 symval
= hi_reloc
.hi_addr
;
4507 sym_sec
= hi_reloc
.sym_sec
;
4509 /* We can not know whether the undefined weak symbol is referenced
4510 according to the information of R_RISCV_PCREL_LO12_I/S. Therefore,
4511 we have to record the 'undefined_weak' flag when handling the
4512 corresponding R_RISCV_HI20 reloc in riscv_record_pcgp_hi_reloc. */
4513 undefined_weak
= hi_reloc
.undefined_weak
;
4517 case R_RISCV_PCREL_HI20
:
4518 /* Mergeable symbols and code might later move out of range. */
4519 if (! undefined_weak
4520 && sym_sec
->flags
& (SEC_MERGE
| SEC_CODE
))
4523 /* If the cooresponding lo relocation has already been seen then it's not
4524 safe to relax this relocation. */
4525 if (riscv_find_pcgp_lo_reloc (pcgp_relocs
, rel
->r_offset
))
4536 /* If gp and the symbol are in the same output section, which is not the
4537 abs section, then consider only that output section's alignment. */
4538 struct bfd_link_hash_entry
*h
=
4539 bfd_link_hash_lookup (link_info
->hash
, RISCV_GP_SYMBOL
, false, false,
4541 if (h
->u
.def
.section
->output_section
== sym_sec
->output_section
4542 && sym_sec
->output_section
!= bfd_abs_section_ptr
)
4543 max_alignment
= (bfd_vma
) 1 << sym_sec
->output_section
->alignment_power
;
4546 /* Is the reference in range of x0 or gp?
4547 Valid gp range conservatively because of alignment issue. */
4549 || (VALID_ITYPE_IMM (symval
)
4551 && VALID_ITYPE_IMM (symval
- gp
+ max_alignment
+ reserve_size
))
4553 && VALID_ITYPE_IMM (symval
- gp
- max_alignment
- reserve_size
))))
4555 unsigned sym
= hi_reloc
.hi_sym
;
4556 switch (ELFNN_R_TYPE (rel
->r_info
))
4558 case R_RISCV_PCREL_LO12_I
:
4561 /* Change the RS1 to zero, and then modify the relocation
4562 type to R_RISCV_LO12_I. */
4563 bfd_vma insn
= bfd_getl32 (contents
+ rel
->r_offset
);
4564 insn
&= ~(OP_MASK_RS1
<< OP_SH_RS1
);
4565 bfd_putl32 (insn
, contents
+ rel
->r_offset
);
4566 rel
->r_info
= ELFNN_R_INFO (sym
, R_RISCV_LO12_I
);
4567 rel
->r_addend
= hi_reloc
.hi_addend
;
4571 rel
->r_info
= ELFNN_R_INFO (sym
, R_RISCV_GPREL_I
);
4572 rel
->r_addend
+= hi_reloc
.hi_addend
;
4576 case R_RISCV_PCREL_LO12_S
:
4579 /* Change the RS1 to zero, and then modify the relocation
4580 type to R_RISCV_LO12_S. */
4581 bfd_vma insn
= bfd_getl32 (contents
+ rel
->r_offset
);
4582 insn
&= ~(OP_MASK_RS1
<< OP_SH_RS1
);
4583 bfd_putl32 (insn
, contents
+ rel
->r_offset
);
4584 rel
->r_info
= ELFNN_R_INFO (sym
, R_RISCV_LO12_S
);
4585 rel
->r_addend
= hi_reloc
.hi_addend
;
4589 rel
->r_info
= ELFNN_R_INFO (sym
, R_RISCV_GPREL_S
);
4590 rel
->r_addend
+= hi_reloc
.hi_addend
;
4594 case R_RISCV_PCREL_HI20
:
4595 riscv_record_pcgp_hi_reloc (pcgp_relocs
,
4599 ELFNN_R_SYM(rel
->r_info
),
4602 /* We can delete the unnecessary AUIPC and reloc. */
4603 rel
->r_info
= ELFNN_R_INFO (0, R_RISCV_DELETE
);
4615 /* Delete the bytes for R_RISCV_DELETE. */
4618 _bfd_riscv_relax_delete (bfd
*abfd
,
4620 asection
*sym_sec ATTRIBUTE_UNUSED
,
4621 struct bfd_link_info
*link_info
,
4622 Elf_Internal_Rela
*rel
,
4623 bfd_vma symval ATTRIBUTE_UNUSED
,
4624 bfd_vma max_alignment ATTRIBUTE_UNUSED
,
4625 bfd_vma reserve_size ATTRIBUTE_UNUSED
,
4626 bool *again ATTRIBUTE_UNUSED
,
4627 riscv_pcgp_relocs
*pcgp_relocs ATTRIBUTE_UNUSED
,
4628 bool undefined_weak ATTRIBUTE_UNUSED
)
4630 if (!riscv_relax_delete_bytes (abfd
, sec
, rel
->r_offset
, rel
->r_addend
,
4633 rel
->r_info
= ELFNN_R_INFO (0, R_RISCV_NONE
);
4637 /* Called by after_allocation to set the information of data segment
4641 bfd_elfNN_riscv_set_data_segment_info (struct bfd_link_info
*info
,
4642 int *data_segment_phase
)
4644 struct riscv_elf_link_hash_table
*htab
= riscv_elf_hash_table (info
);
4645 htab
->data_segment_phase
= data_segment_phase
;
4650 Pass 0: Shortens code sequences for LUI/CALL/TPREL/PCREL relocs.
4651 Pass 1: Deletes the bytes that PCREL relaxation in pass 0 made obsolete.
4652 Pass 2: Which cannot be disabled, handles code alignment directives. */
4655 _bfd_riscv_relax_section (bfd
*abfd
, asection
*sec
,
4656 struct bfd_link_info
*info
,
4659 Elf_Internal_Shdr
*symtab_hdr
= &elf_symtab_hdr (abfd
);
4660 struct riscv_elf_link_hash_table
*htab
= riscv_elf_hash_table (info
);
4661 struct bfd_elf_section_data
*data
= elf_section_data (sec
);
4662 Elf_Internal_Rela
*relocs
;
4665 bfd_vma max_alignment
, reserve_size
= 0;
4666 riscv_pcgp_relocs pcgp_relocs
;
4670 if (bfd_link_relocatable (info
)
4672 || (sec
->flags
& SEC_RELOC
) == 0
4673 || sec
->reloc_count
== 0
4674 || (info
->disable_target_specific_optimizations
4675 && info
->relax_pass
== 0)
4676 /* The exp_seg_relro_adjust is enum phase_enum (0x4),
4677 and defined in ld/ldexp.h. */
4678 || *(htab
->data_segment_phase
) == 4)
4681 riscv_init_pcgp_relocs (&pcgp_relocs
);
4683 /* Read this BFD's relocs if we haven't done so already. */
4685 relocs
= data
->relocs
;
4686 else if (!(relocs
= _bfd_elf_link_read_relocs (abfd
, sec
, NULL
, NULL
,
4687 info
->keep_memory
)))
4692 max_alignment
= htab
->max_alignment
;
4693 if (max_alignment
== (bfd_vma
) -1)
4695 max_alignment
= _bfd_riscv_get_max_alignment (sec
);
4696 htab
->max_alignment
= max_alignment
;
4700 max_alignment
= _bfd_riscv_get_max_alignment (sec
);
4702 /* Examine and consider relaxing each reloc. */
4703 for (i
= 0; i
< sec
->reloc_count
; i
++)
4706 Elf_Internal_Rela
*rel
= relocs
+ i
;
4707 relax_func_t relax_func
;
4708 int type
= ELFNN_R_TYPE (rel
->r_info
);
4711 bool undefined_weak
= false;
4714 if (info
->relax_pass
== 0)
4716 if (type
== R_RISCV_CALL
4717 || type
== R_RISCV_CALL_PLT
)
4718 relax_func
= _bfd_riscv_relax_call
;
4719 else if (type
== R_RISCV_HI20
4720 || type
== R_RISCV_LO12_I
4721 || type
== R_RISCV_LO12_S
)
4722 relax_func
= _bfd_riscv_relax_lui
;
4723 else if (type
== R_RISCV_TPREL_HI20
4724 || type
== R_RISCV_TPREL_ADD
4725 || type
== R_RISCV_TPREL_LO12_I
4726 || type
== R_RISCV_TPREL_LO12_S
)
4727 relax_func
= _bfd_riscv_relax_tls_le
;
4728 else if (!bfd_link_pic (info
)
4729 && (type
== R_RISCV_PCREL_HI20
4730 || type
== R_RISCV_PCREL_LO12_I
4731 || type
== R_RISCV_PCREL_LO12_S
))
4732 relax_func
= _bfd_riscv_relax_pc
;
4736 /* Only relax this reloc if it is paired with R_RISCV_RELAX. */
4737 if (i
== sec
->reloc_count
- 1
4738 || ELFNN_R_TYPE ((rel
+ 1)->r_info
) != R_RISCV_RELAX
4739 || rel
->r_offset
!= (rel
+ 1)->r_offset
)
4742 /* Skip over the R_RISCV_RELAX. */
4745 else if (info
->relax_pass
== 1 && type
== R_RISCV_DELETE
)
4746 relax_func
= _bfd_riscv_relax_delete
;
4747 else if (info
->relax_pass
== 2 && type
== R_RISCV_ALIGN
)
4748 relax_func
= _bfd_riscv_relax_align
;
4752 data
->relocs
= relocs
;
4754 /* Read this BFD's contents if we haven't done so already. */
4755 if (!data
->this_hdr
.contents
4756 && !bfd_malloc_and_get_section (abfd
, sec
, &data
->this_hdr
.contents
))
4759 /* Read this BFD's symbols if we haven't done so already. */
4760 if (symtab_hdr
->sh_info
!= 0
4761 && !symtab_hdr
->contents
4762 && !(symtab_hdr
->contents
=
4763 (unsigned char *) bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
4764 symtab_hdr
->sh_info
,
4765 0, NULL
, NULL
, NULL
)))
4768 /* Get the value of the symbol referred to by the reloc. */
4769 if (ELFNN_R_SYM (rel
->r_info
) < symtab_hdr
->sh_info
)
4771 /* A local symbol. */
4772 Elf_Internal_Sym
*isym
= ((Elf_Internal_Sym
*) symtab_hdr
->contents
4773 + ELFNN_R_SYM (rel
->r_info
));
4774 reserve_size
= (isym
->st_size
- rel
->r_addend
) > isym
->st_size
4775 ? 0 : isym
->st_size
- rel
->r_addend
;
4777 /* Relocate against local STT_GNU_IFUNC symbol. we have created
4778 a fake global symbol entry for this, so deal with the local ifunc
4780 if (ELF_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
4783 if (isym
->st_shndx
== SHN_UNDEF
)
4784 sym_sec
= sec
, symval
= rel
->r_offset
;
4787 BFD_ASSERT (isym
->st_shndx
< elf_numsections (abfd
));
4788 sym_sec
= elf_elfsections (abfd
)[isym
->st_shndx
]->bfd_section
;
4790 /* The purpose of this code is unknown. It breaks linker scripts
4791 for embedded development that place sections at address zero.
4792 This code is believed to be unnecessary. Disabling it but not
4793 yet removing it, in case something breaks. */
4794 if (sec_addr (sym_sec
) == 0)
4797 symval
= isym
->st_value
;
4799 symtype
= ELF_ST_TYPE (isym
->st_info
);
4804 struct elf_link_hash_entry
*h
;
4806 indx
= ELFNN_R_SYM (rel
->r_info
) - symtab_hdr
->sh_info
;
4807 h
= elf_sym_hashes (abfd
)[indx
];
4809 while (h
->root
.type
== bfd_link_hash_indirect
4810 || h
->root
.type
== bfd_link_hash_warning
)
4811 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4813 /* Disable the relaxation for ifunc. */
4814 if (h
!= NULL
&& h
->type
== STT_GNU_IFUNC
)
4817 if (h
->root
.type
== bfd_link_hash_undefweak
4818 && (relax_func
== _bfd_riscv_relax_lui
4819 || relax_func
== _bfd_riscv_relax_pc
))
4821 /* For the lui and auipc relaxations, since the symbol
4822 value of an undefined weak symbol is always be zero,
4823 we can optimize the patterns into a single LI/MV/ADDI
4826 Note that, creating shared libraries and pie output may
4827 break the rule above. Fortunately, since we do not relax
4828 pc relocs when creating shared libraries and pie output,
4829 and the absolute address access for R_RISCV_HI20 isn't
4830 allowed when "-fPIC" is set, the problem of creating shared
4831 libraries can not happen currently. Once we support the
4832 auipc relaxations when creating shared libraries, then we will
4833 need the more rigorous checking for this optimization. */
4834 undefined_weak
= true;
4837 /* This line has to match the check in riscv_elf_relocate_section
4838 in the R_RISCV_CALL[_PLT] case. */
4839 if (bfd_link_pic (info
) && h
->plt
.offset
!= MINUS_ONE
)
4841 sym_sec
= htab
->elf
.splt
;
4842 symval
= h
->plt
.offset
;
4844 else if (undefined_weak
)
4847 sym_sec
= bfd_und_section_ptr
;
4849 else if ((h
->root
.type
== bfd_link_hash_defined
4850 || h
->root
.type
== bfd_link_hash_defweak
)
4851 && h
->root
.u
.def
.section
!= NULL
4852 && h
->root
.u
.def
.section
->output_section
!= NULL
)
4854 symval
= h
->root
.u
.def
.value
;
4855 sym_sec
= h
->root
.u
.def
.section
;
4860 if (h
->type
!= STT_FUNC
)
4862 (h
->size
- rel
->r_addend
) > h
->size
? 0 : h
->size
- rel
->r_addend
;
4866 if (sym_sec
->sec_info_type
== SEC_INFO_TYPE_MERGE
4867 && (sym_sec
->flags
& SEC_MERGE
))
4869 /* At this stage in linking, no SEC_MERGE symbol has been
4870 adjusted, so all references to such symbols need to be
4871 passed through _bfd_merged_section_offset. (Later, in
4872 relocate_section, all SEC_MERGE symbols *except* for
4873 section symbols have been adjusted.)
4875 gas may reduce relocations against symbols in SEC_MERGE
4876 sections to a relocation against the section symbol when
4877 the original addend was zero. When the reloc is against
4878 a section symbol we should include the addend in the
4879 offset passed to _bfd_merged_section_offset, since the
4880 location of interest is the original symbol. On the
4881 other hand, an access to "sym+addend" where "sym" is not
4882 a section symbol should not include the addend; Such an
4883 access is presumed to be an offset from "sym"; The
4884 location of interest is just "sym". */
4885 if (symtype
== STT_SECTION
)
4886 symval
+= rel
->r_addend
;
4888 symval
= _bfd_merged_section_offset (abfd
, &sym_sec
,
4889 elf_section_data (sym_sec
)->sec_info
,
4892 if (symtype
!= STT_SECTION
)
4893 symval
+= rel
->r_addend
;
4896 symval
+= rel
->r_addend
;
4898 symval
+= sec_addr (sym_sec
);
4900 if (!relax_func (abfd
, sec
, sym_sec
, info
, rel
, symval
,
4901 max_alignment
, reserve_size
, again
,
4902 &pcgp_relocs
, undefined_weak
))
4909 if (relocs
!= data
->relocs
)
4911 riscv_free_pcgp_relocs (&pcgp_relocs
, abfd
, sec
);
4917 # define PRSTATUS_SIZE 204
4918 # define PRSTATUS_OFFSET_PR_CURSIG 12
4919 # define PRSTATUS_OFFSET_PR_PID 24
4920 # define PRSTATUS_OFFSET_PR_REG 72
4921 # define ELF_GREGSET_T_SIZE 128
4922 # define PRPSINFO_SIZE 128
4923 # define PRPSINFO_OFFSET_PR_PID 16
4924 # define PRPSINFO_OFFSET_PR_FNAME 32
4925 # define PRPSINFO_OFFSET_PR_PSARGS 48
4926 # define PRPSINFO_PR_FNAME_LENGTH 16
4927 # define PRPSINFO_PR_PSARGS_LENGTH 80
4929 # define PRSTATUS_SIZE 376
4930 # define PRSTATUS_OFFSET_PR_CURSIG 12
4931 # define PRSTATUS_OFFSET_PR_PID 32
4932 # define PRSTATUS_OFFSET_PR_REG 112
4933 # define ELF_GREGSET_T_SIZE 256
4934 # define PRPSINFO_SIZE 136
4935 # define PRPSINFO_OFFSET_PR_PID 24
4936 # define PRPSINFO_OFFSET_PR_FNAME 40
4937 # define PRPSINFO_OFFSET_PR_PSARGS 56
4938 # define PRPSINFO_PR_FNAME_LENGTH 16
4939 # define PRPSINFO_PR_PSARGS_LENGTH 80
4942 /* Write PRSTATUS and PRPSINFO note into core file. This will be called
4943 before the generic code in elf.c. By checking the compiler defines we
4944 only perform any action here if the generic code would otherwise not be
4945 able to help us. The intention is that bare metal core dumps (where the
4946 prstatus_t and/or prpsinfo_t might not be available) will use this code,
4947 while non bare metal tools will use the generic elf code. */
4950 riscv_write_core_note (bfd
*abfd ATTRIBUTE_UNUSED
,
4951 char *buf ATTRIBUTE_UNUSED
,
4952 int *bufsiz ATTRIBUTE_UNUSED
,
4953 int note_type ATTRIBUTE_UNUSED
, ...)
4960 #if !defined (HAVE_PRPSINFO_T)
4963 char data
[PRPSINFO_SIZE
] ATTRIBUTE_NONSTRING
;
4966 va_start (ap
, note_type
);
4967 memset (data
, 0, sizeof (data
));
4968 strncpy (data
+ PRPSINFO_OFFSET_PR_FNAME
, va_arg (ap
, const char *),
4969 PRPSINFO_PR_FNAME_LENGTH
);
4970 #if GCC_VERSION == 8000 || GCC_VERSION == 8001
4972 /* GCC 8.0 and 8.1 warn about 80 equals destination size with
4973 -Wstringop-truncation:
4974 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85643
4976 DIAGNOSTIC_IGNORE_STRINGOP_TRUNCATION
;
4978 strncpy (data
+ PRPSINFO_OFFSET_PR_PSARGS
, va_arg (ap
, const char *),
4979 PRPSINFO_PR_PSARGS_LENGTH
);
4980 #if GCC_VERSION == 8000 || GCC_VERSION == 8001
4984 return elfcore_write_note (abfd
, buf
, bufsiz
,
4985 "CORE", note_type
, data
, sizeof (data
));
4987 #endif /* !HAVE_PRPSINFO_T */
4989 #if !defined (HAVE_PRSTATUS_T)
4992 char data
[PRSTATUS_SIZE
];
4998 va_start (ap
, note_type
);
4999 memset (data
, 0, sizeof(data
));
5000 pid
= va_arg (ap
, long);
5001 bfd_put_32 (abfd
, pid
, data
+ PRSTATUS_OFFSET_PR_PID
);
5002 cursig
= va_arg (ap
, int);
5003 bfd_put_16 (abfd
, cursig
, data
+ PRSTATUS_OFFSET_PR_CURSIG
);
5004 greg
= va_arg (ap
, const void *);
5005 memcpy (data
+ PRSTATUS_OFFSET_PR_REG
, greg
,
5006 PRSTATUS_SIZE
- PRSTATUS_OFFSET_PR_REG
- ARCH_SIZE
/ 8);
5008 return elfcore_write_note (abfd
, buf
, bufsiz
,
5009 "CORE", note_type
, data
, sizeof (data
));
5011 #endif /* !HAVE_PRSTATUS_T */
5015 /* Support for core dump NOTE sections. */
5018 riscv_elf_grok_prstatus (bfd
*abfd
, Elf_Internal_Note
*note
)
5020 switch (note
->descsz
)
5025 case PRSTATUS_SIZE
: /* sizeof(struct elf_prstatus) on Linux/RISC-V. */
5027 elf_tdata (abfd
)->core
->signal
5028 = bfd_get_16 (abfd
, note
->descdata
+ PRSTATUS_OFFSET_PR_CURSIG
);
5031 elf_tdata (abfd
)->core
->lwpid
5032 = bfd_get_32 (abfd
, note
->descdata
+ PRSTATUS_OFFSET_PR_PID
);
5036 /* Make a ".reg/999" section. */
5037 return _bfd_elfcore_make_pseudosection (abfd
, ".reg", ELF_GREGSET_T_SIZE
,
5038 note
->descpos
+ PRSTATUS_OFFSET_PR_REG
);
5042 riscv_elf_grok_psinfo (bfd
*abfd
, Elf_Internal_Note
*note
)
5044 switch (note
->descsz
)
5049 case PRPSINFO_SIZE
: /* sizeof(struct elf_prpsinfo) on Linux/RISC-V. */
5051 elf_tdata (abfd
)->core
->pid
5052 = bfd_get_32 (abfd
, note
->descdata
+ PRPSINFO_OFFSET_PR_PID
);
5055 elf_tdata (abfd
)->core
->program
= _bfd_elfcore_strndup
5056 (abfd
, note
->descdata
+ PRPSINFO_OFFSET_PR_FNAME
,
5057 PRPSINFO_PR_FNAME_LENGTH
);
5060 elf_tdata (abfd
)->core
->command
= _bfd_elfcore_strndup
5061 (abfd
, note
->descdata
+ PRPSINFO_OFFSET_PR_PSARGS
,
5062 PRPSINFO_PR_PSARGS_LENGTH
);
5066 /* Note that for some reason, a spurious space is tacked
5067 onto the end of the args in some (at least one anyway)
5068 implementations, so strip it off if it exists. */
5071 char *command
= elf_tdata (abfd
)->core
->command
;
5072 int n
= strlen (command
);
5074 if (0 < n
&& command
[n
- 1] == ' ')
5075 command
[n
- 1] = '\0';
5081 /* Set the right mach type. */
5084 riscv_elf_object_p (bfd
*abfd
)
5086 /* There are only two mach types in RISCV currently. */
5087 if (strcmp (abfd
->xvec
->name
, "elf32-littleriscv") == 0
5088 || strcmp (abfd
->xvec
->name
, "elf32-bigriscv") == 0)
5089 bfd_default_set_arch_mach (abfd
, bfd_arch_riscv
, bfd_mach_riscv32
);
5091 bfd_default_set_arch_mach (abfd
, bfd_arch_riscv
, bfd_mach_riscv64
);
5096 /* Determine whether an object attribute tag takes an integer, a
5100 riscv_elf_obj_attrs_arg_type (int tag
)
5102 return (tag
& 1) != 0 ? ATTR_TYPE_FLAG_STR_VAL
: ATTR_TYPE_FLAG_INT_VAL
;
5105 /* Do not choose mapping symbols as a function name. */
5107 static bfd_size_type
5108 riscv_maybe_function_sym (const asymbol
*sym
,
5112 if (sym
->flags
& BSF_LOCAL
5113 && riscv_elf_is_mapping_symbols (sym
->name
))
5116 return _bfd_elf_maybe_function_sym (sym
, sec
, code_off
);
5119 /* Treat the following cases as target special symbols, they are
5123 riscv_elf_is_target_special_symbol (bfd
*abfd
, asymbol
*sym
)
5125 /* PR27584, local and empty symbols. Since they are usually
5126 generated for pcrel relocations. */
5127 return (!strcmp (sym
->name
, "")
5128 || _bfd_elf_is_local_label_name (abfd
, sym
->name
)
5129 /* PR27916, mapping symbols. */
5130 || riscv_elf_is_mapping_symbols (sym
->name
));
5134 riscv_elf_additional_program_headers (bfd
*abfd
,
5135 struct bfd_link_info
*info ATTRIBUTE_UNUSED
)
5139 /* See if we need a PT_RISCV_ATTRIBUTES segment. */
5140 if (bfd_get_section_by_name (abfd
, RISCV_ATTRIBUTES_SECTION_NAME
))
5147 riscv_elf_modify_segment_map (bfd
*abfd
,
5148 struct bfd_link_info
*info ATTRIBUTE_UNUSED
)
5151 struct elf_segment_map
*m
, **pm
;
5154 /* If there is a .riscv.attributes section, we need a PT_RISCV_ATTRIBUTES
5156 s
= bfd_get_section_by_name (abfd
, RISCV_ATTRIBUTES_SECTION_NAME
);
5159 for (m
= elf_seg_map (abfd
); m
!= NULL
; m
= m
->next
)
5160 if (m
->p_type
== PT_RISCV_ATTRIBUTES
)
5162 /* If there is already a PT_RISCV_ATTRIBUTES header, avoid adding
5167 m
= bfd_zalloc (abfd
, amt
);
5171 m
->p_type
= PT_RISCV_ATTRIBUTES
;
5175 /* We want to put it after the PHDR and INTERP segments. */
5176 pm
= &elf_seg_map (abfd
);
5178 && ((*pm
)->p_type
== PT_PHDR
5179 || (*pm
)->p_type
== PT_INTERP
))
5190 /* Merge non-visibility st_other attributes. */
5193 riscv_elf_merge_symbol_attribute (struct elf_link_hash_entry
*h
,
5194 unsigned int st_other
,
5195 bool definition ATTRIBUTE_UNUSED
,
5196 bool dynamic ATTRIBUTE_UNUSED
)
5198 unsigned int isym_sto
= st_other
& ~ELF_ST_VISIBILITY (-1);
5199 unsigned int h_sto
= h
->other
& ~ELF_ST_VISIBILITY (-1);
5201 if (isym_sto
== h_sto
)
5204 if (isym_sto
& ~STO_RISCV_VARIANT_CC
)
5205 _bfd_error_handler (_("unknown attribute for symbol `%s': 0x%02x"),
5206 h
->root
.root
.string
, isym_sto
);
5208 if (isym_sto
& STO_RISCV_VARIANT_CC
)
5209 h
->other
|= STO_RISCV_VARIANT_CC
;
5212 #define TARGET_LITTLE_SYM riscv_elfNN_vec
5213 #define TARGET_LITTLE_NAME "elfNN-littleriscv"
5214 #define TARGET_BIG_SYM riscv_elfNN_be_vec
5215 #define TARGET_BIG_NAME "elfNN-bigriscv"
5217 #define elf_backend_reloc_type_class riscv_reloc_type_class
5219 #define bfd_elfNN_bfd_reloc_name_lookup riscv_reloc_name_lookup
5220 #define bfd_elfNN_bfd_link_hash_table_create riscv_elf_link_hash_table_create
5221 #define bfd_elfNN_bfd_reloc_type_lookup riscv_reloc_type_lookup
5222 #define bfd_elfNN_bfd_merge_private_bfd_data \
5223 _bfd_riscv_elf_merge_private_bfd_data
5224 #define bfd_elfNN_bfd_is_target_special_symbol riscv_elf_is_target_special_symbol
5226 #define elf_backend_copy_indirect_symbol riscv_elf_copy_indirect_symbol
5227 #define elf_backend_create_dynamic_sections riscv_elf_create_dynamic_sections
5228 #define elf_backend_check_relocs riscv_elf_check_relocs
5229 #define elf_backend_adjust_dynamic_symbol riscv_elf_adjust_dynamic_symbol
5230 #define elf_backend_size_dynamic_sections riscv_elf_size_dynamic_sections
5231 #define elf_backend_relocate_section riscv_elf_relocate_section
5232 #define elf_backend_finish_dynamic_symbol riscv_elf_finish_dynamic_symbol
5233 #define elf_backend_finish_dynamic_sections riscv_elf_finish_dynamic_sections
5234 #define elf_backend_plt_sym_val riscv_elf_plt_sym_val
5235 #define elf_backend_grok_prstatus riscv_elf_grok_prstatus
5236 #define elf_backend_grok_psinfo riscv_elf_grok_psinfo
5237 #define elf_backend_object_p riscv_elf_object_p
5238 #define elf_backend_write_core_note riscv_write_core_note
5239 #define elf_backend_maybe_function_sym riscv_maybe_function_sym
5240 #define elf_info_to_howto_rel NULL
5241 #define elf_info_to_howto riscv_info_to_howto_rela
5242 #define bfd_elfNN_bfd_relax_section _bfd_riscv_relax_section
5243 #define bfd_elfNN_mkobject elfNN_riscv_mkobject
5244 #define elf_backend_additional_program_headers \
5245 riscv_elf_additional_program_headers
5246 #define elf_backend_modify_segment_map riscv_elf_modify_segment_map
5247 #define elf_backend_merge_symbol_attribute riscv_elf_merge_symbol_attribute
5249 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
5251 #define elf_backend_can_gc_sections 1
5252 #define elf_backend_can_refcount 1
5253 #define elf_backend_want_got_plt 1
5254 #define elf_backend_plt_readonly 1
5255 #define elf_backend_plt_alignment 4
5256 #define elf_backend_want_plt_sym 1
5257 #define elf_backend_got_header_size (ARCH_SIZE / 8)
5258 #define elf_backend_want_dynrelro 1
5259 #define elf_backend_rela_normal 1
5260 #define elf_backend_default_execstack 0
5262 #undef elf_backend_obj_attrs_vendor
5263 #define elf_backend_obj_attrs_vendor "riscv"
5264 #undef elf_backend_obj_attrs_arg_type
5265 #define elf_backend_obj_attrs_arg_type riscv_elf_obj_attrs_arg_type
5266 #undef elf_backend_obj_attrs_section_type
5267 #define elf_backend_obj_attrs_section_type SHT_RISCV_ATTRIBUTES
5268 #undef elf_backend_obj_attrs_section
5269 #define elf_backend_obj_attrs_section RISCV_ATTRIBUTES_SECTION_NAME
5271 #include "elfNN-target.h"