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e23eba97 | 1 | /* RISC-V-specific support for NN-bit ELF. |
250d07de | 2 | Copyright (C) 2011-2021 Free Software Foundation, Inc. |
e23eba97 NC |
3 | |
4 | Contributed by Andrew Waterman (andrew@sifive.com). | |
5 | Based on TILE-Gx and MIPS targets. | |
6 | ||
7 | This file is part of BFD, the Binary File Descriptor library. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 3 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program; see the file COPYING3. If not, | |
21 | see <http://www.gnu.org/licenses/>. */ | |
22 | ||
23 | /* This file handles RISC-V ELF targets. */ | |
24 | ||
25 | #include "sysdep.h" | |
26 | #include "bfd.h" | |
27 | #include "libbfd.h" | |
28 | #include "bfdlink.h" | |
29 | #include "genlink.h" | |
30 | #include "elf-bfd.h" | |
31 | #include "elfxx-riscv.h" | |
32 | #include "elf/riscv.h" | |
33 | #include "opcode/riscv.h" | |
02dd9d25 | 34 | #include "objalloc.h" |
3d73d29e | 35 | #include "cpu-riscv.h" |
e23eba97 | 36 | |
fbc09e7a MC |
37 | #ifdef HAVE_LIMITS_H |
38 | #include <limits.h> | |
39 | #endif | |
40 | #ifndef CHAR_BIT | |
41 | #define CHAR_BIT 8 | |
42 | #endif | |
43 | ||
ff6f4d9b PD |
44 | /* Internal relocations used exclusively by the relaxation pass. */ |
45 | #define R_RISCV_DELETE (R_RISCV_max + 1) | |
46 | ||
e23eba97 NC |
47 | #define ARCH_SIZE NN |
48 | ||
49 | #define MINUS_ONE ((bfd_vma)0 - 1) | |
50 | ||
51 | #define RISCV_ELF_LOG_WORD_BYTES (ARCH_SIZE == 32 ? 2 : 3) | |
52 | ||
53 | #define RISCV_ELF_WORD_BYTES (1 << RISCV_ELF_LOG_WORD_BYTES) | |
54 | ||
55 | /* The name of the dynamic interpreter. This is put in the .interp | |
56 | section. */ | |
57 | ||
58 | #define ELF64_DYNAMIC_INTERPRETER "/lib/ld.so.1" | |
59 | #define ELF32_DYNAMIC_INTERPRETER "/lib32/ld.so.1" | |
60 | ||
61 | #define ELF_ARCH bfd_arch_riscv | |
62 | #define ELF_TARGET_ID RISCV_ELF_DATA | |
63 | #define ELF_MACHINE_CODE EM_RISCV | |
64 | #define ELF_MAXPAGESIZE 0x1000 | |
65 | #define ELF_COMMONPAGESIZE 0x1000 | |
66 | ||
e23eba97 NC |
67 | /* RISC-V ELF linker hash entry. */ |
68 | ||
69 | struct riscv_elf_link_hash_entry | |
70 | { | |
71 | struct elf_link_hash_entry elf; | |
72 | ||
1942a048 NC |
73 | #define GOT_UNKNOWN 0 |
74 | #define GOT_NORMAL 1 | |
75 | #define GOT_TLS_GD 2 | |
76 | #define GOT_TLS_IE 4 | |
77 | #define GOT_TLS_LE 8 | |
e23eba97 NC |
78 | char tls_type; |
79 | }; | |
80 | ||
81 | #define riscv_elf_hash_entry(ent) \ | |
1942a048 | 82 | ((struct riscv_elf_link_hash_entry *) (ent)) |
e23eba97 NC |
83 | |
84 | struct _bfd_riscv_elf_obj_tdata | |
85 | { | |
86 | struct elf_obj_tdata root; | |
87 | ||
88 | /* tls_type for each local got entry. */ | |
89 | char *local_got_tls_type; | |
90 | }; | |
91 | ||
92 | #define _bfd_riscv_elf_tdata(abfd) \ | |
93 | ((struct _bfd_riscv_elf_obj_tdata *) (abfd)->tdata.any) | |
94 | ||
95 | #define _bfd_riscv_elf_local_got_tls_type(abfd) \ | |
96 | (_bfd_riscv_elf_tdata (abfd)->local_got_tls_type) | |
97 | ||
98 | #define _bfd_riscv_elf_tls_type(abfd, h, symndx) \ | |
99 | (*((h) != NULL ? &riscv_elf_hash_entry (h)->tls_type \ | |
100 | : &_bfd_riscv_elf_local_got_tls_type (abfd) [symndx])) | |
101 | ||
102 | #define is_riscv_elf(bfd) \ | |
103 | (bfd_get_flavour (bfd) == bfd_target_elf_flavour \ | |
104 | && elf_tdata (bfd) != NULL \ | |
105 | && elf_object_id (bfd) == RISCV_ELF_DATA) | |
106 | ||
0a1b45a2 | 107 | static bool |
fc46e8bd NC |
108 | elfNN_riscv_mkobject (bfd *abfd) |
109 | { | |
110 | return bfd_elf_allocate_object (abfd, | |
111 | sizeof (struct _bfd_riscv_elf_obj_tdata), | |
112 | RISCV_ELF_DATA); | |
113 | } | |
114 | ||
e23eba97 NC |
115 | #include "elf/common.h" |
116 | #include "elf/internal.h" | |
117 | ||
118 | struct riscv_elf_link_hash_table | |
119 | { | |
120 | struct elf_link_hash_table elf; | |
121 | ||
122 | /* Short-cuts to get to dynamic linker sections. */ | |
e23eba97 NC |
123 | asection *sdyntdata; |
124 | ||
fc3c5343 L |
125 | /* The max alignment of output sections. */ |
126 | bfd_vma max_alignment; | |
02dd9d25 NC |
127 | |
128 | /* Used by local STT_GNU_IFUNC symbols. */ | |
129 | htab_t loc_hash_table; | |
130 | void * loc_hash_memory; | |
51a8a7c2 NC |
131 | |
132 | /* The index of the last unused .rel.iplt slot. */ | |
133 | bfd_vma last_iplt_index; | |
ebdcad3f NC |
134 | |
135 | /* Re-run the relaxations from relax pass 0 if TRUE. */ | |
0a1b45a2 | 136 | bool restart_relax; |
e23eba97 NC |
137 | }; |
138 | ||
fbc09e7a | 139 | /* Instruction access functions. */ |
fbc09e7a MC |
140 | #define riscv_get_insn(bits, ptr) \ |
141 | ((bits) == 16 ? bfd_getl16 (ptr) \ | |
142 | : (bits) == 32 ? bfd_getl32 (ptr) \ | |
143 | : (bits) == 64 ? bfd_getl64 (ptr) \ | |
144 | : (abort (), (bfd_vma) - 1)) | |
145 | #define riscv_put_insn(bits, val, ptr) \ | |
146 | ((bits) == 16 ? bfd_putl16 (val, ptr) \ | |
147 | : (bits) == 32 ? bfd_putl32 (val, ptr) \ | |
148 | : (bits) == 64 ? bfd_putl64 (val, ptr) \ | |
149 | : (abort (), (void) 0)) | |
e23eba97 NC |
150 | |
151 | /* Get the RISC-V ELF linker hash table from a link_info structure. */ | |
152 | #define riscv_elf_hash_table(p) \ | |
0f55320b AM |
153 | ((is_elf_hash_table ((p)->hash) \ |
154 | && elf_hash_table_id (elf_hash_table (p)) == RISCV_ELF_DATA) \ | |
155 | ? (struct riscv_elf_link_hash_table *) (p)->hash : NULL) | |
e23eba97 | 156 | |
0a1b45a2 | 157 | static bool |
0aa13fee | 158 | riscv_info_to_howto_rela (bfd *abfd, |
e23eba97 NC |
159 | arelent *cache_ptr, |
160 | Elf_Internal_Rela *dst) | |
161 | { | |
0aa13fee | 162 | cache_ptr->howto = riscv_elf_rtype_to_howto (abfd, ELFNN_R_TYPE (dst->r_info)); |
f3185997 | 163 | return cache_ptr->howto != NULL; |
e23eba97 NC |
164 | } |
165 | ||
166 | static void | |
167 | riscv_elf_append_rela (bfd *abfd, asection *s, Elf_Internal_Rela *rel) | |
168 | { | |
169 | const struct elf_backend_data *bed; | |
170 | bfd_byte *loc; | |
171 | ||
172 | bed = get_elf_backend_data (abfd); | |
173 | loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rela); | |
174 | bed->s->swap_reloca_out (abfd, rel, loc); | |
175 | } | |
176 | ||
fbc09e7a MC |
177 | /* Return true if a relocation is modifying an instruction. */ |
178 | ||
0a1b45a2 | 179 | static bool |
fbc09e7a MC |
180 | riscv_is_insn_reloc (const reloc_howto_type *howto) |
181 | { | |
182 | /* Heuristic: A multibyte destination with a nontrivial mask | |
183 | is an instruction */ | |
184 | return (howto->bitsize > 8 | |
185 | && howto->dst_mask != 0 | |
186 | && ~(howto->dst_mask | (howto->bitsize < sizeof(bfd_vma) * CHAR_BIT | |
187 | ? (MINUS_ONE << howto->bitsize) : (bfd_vma)0)) != 0); | |
188 | } | |
189 | ||
e23eba97 | 190 | /* PLT/GOT stuff. */ |
e23eba97 NC |
191 | #define PLT_HEADER_INSNS 8 |
192 | #define PLT_ENTRY_INSNS 4 | |
193 | #define PLT_HEADER_SIZE (PLT_HEADER_INSNS * 4) | |
194 | #define PLT_ENTRY_SIZE (PLT_ENTRY_INSNS * 4) | |
e23eba97 | 195 | #define GOT_ENTRY_SIZE RISCV_ELF_WORD_BYTES |
02dd9d25 NC |
196 | /* Reserve two entries of GOTPLT for ld.so, one is used for PLT resolver, |
197 | the other is used for link map. Other targets also reserve one more | |
198 | entry used for runtime profile? */ | |
e23eba97 NC |
199 | #define GOTPLT_HEADER_SIZE (2 * GOT_ENTRY_SIZE) |
200 | ||
201 | #define sec_addr(sec) ((sec)->output_section->vma + (sec)->output_offset) | |
202 | ||
e23eba97 NC |
203 | #if ARCH_SIZE == 32 |
204 | # define MATCH_LREG MATCH_LW | |
205 | #else | |
206 | # define MATCH_LREG MATCH_LD | |
207 | #endif | |
208 | ||
209 | /* Generate a PLT header. */ | |
210 | ||
0a1b45a2 | 211 | static bool |
5ef23793 JW |
212 | riscv_make_plt_header (bfd *output_bfd, bfd_vma gotplt_addr, bfd_vma addr, |
213 | uint32_t *entry) | |
e23eba97 NC |
214 | { |
215 | bfd_vma gotplt_offset_high = RISCV_PCREL_HIGH_PART (gotplt_addr, addr); | |
216 | bfd_vma gotplt_offset_low = RISCV_PCREL_LOW_PART (gotplt_addr, addr); | |
217 | ||
5ef23793 JW |
218 | /* RVE has no t3 register, so this won't work, and is not supported. */ |
219 | if (elf_elfheader (output_bfd)->e_flags & EF_RISCV_RVE) | |
220 | { | |
221 | _bfd_error_handler (_("%pB: warning: RVE PLT generation not supported"), | |
222 | output_bfd); | |
0a1b45a2 | 223 | return false; |
5ef23793 JW |
224 | } |
225 | ||
e23eba97 | 226 | /* auipc t2, %hi(.got.plt) |
07d6d2b8 | 227 | sub t1, t1, t3 # shifted .got.plt offset + hdr size + 12 |
e23eba97 NC |
228 | l[w|d] t3, %lo(.got.plt)(t2) # _dl_runtime_resolve |
229 | addi t1, t1, -(hdr size + 12) # shifted .got.plt offset | |
230 | addi t0, t2, %lo(.got.plt) # &.got.plt | |
231 | srli t1, t1, log2(16/PTRSIZE) # .got.plt offset | |
07d6d2b8 | 232 | l[w|d] t0, PTRSIZE(t0) # link map |
dcd709e0 | 233 | jr t3 */ |
e23eba97 NC |
234 | |
235 | entry[0] = RISCV_UTYPE (AUIPC, X_T2, gotplt_offset_high); | |
236 | entry[1] = RISCV_RTYPE (SUB, X_T1, X_T1, X_T3); | |
237 | entry[2] = RISCV_ITYPE (LREG, X_T3, X_T2, gotplt_offset_low); | |
1174d920 | 238 | entry[3] = RISCV_ITYPE (ADDI, X_T1, X_T1, (uint32_t) -(PLT_HEADER_SIZE + 12)); |
e23eba97 NC |
239 | entry[4] = RISCV_ITYPE (ADDI, X_T0, X_T2, gotplt_offset_low); |
240 | entry[5] = RISCV_ITYPE (SRLI, X_T1, X_T1, 4 - RISCV_ELF_LOG_WORD_BYTES); | |
241 | entry[6] = RISCV_ITYPE (LREG, X_T0, X_T0, RISCV_ELF_WORD_BYTES); | |
242 | entry[7] = RISCV_ITYPE (JALR, 0, X_T3, 0); | |
5ef23793 | 243 | |
0a1b45a2 | 244 | return true; |
e23eba97 NC |
245 | } |
246 | ||
247 | /* Generate a PLT entry. */ | |
248 | ||
0a1b45a2 | 249 | static bool |
5ef23793 JW |
250 | riscv_make_plt_entry (bfd *output_bfd, bfd_vma got, bfd_vma addr, |
251 | uint32_t *entry) | |
e23eba97 | 252 | { |
5ef23793 JW |
253 | /* RVE has no t3 register, so this won't work, and is not supported. */ |
254 | if (elf_elfheader (output_bfd)->e_flags & EF_RISCV_RVE) | |
255 | { | |
256 | _bfd_error_handler (_("%pB: warning: RVE PLT generation not supported"), | |
257 | output_bfd); | |
0a1b45a2 | 258 | return false; |
5ef23793 JW |
259 | } |
260 | ||
e23eba97 NC |
261 | /* auipc t3, %hi(.got.plt entry) |
262 | l[w|d] t3, %lo(.got.plt entry)(t3) | |
263 | jalr t1, t3 | |
dcd709e0 | 264 | nop */ |
e23eba97 NC |
265 | |
266 | entry[0] = RISCV_UTYPE (AUIPC, X_T3, RISCV_PCREL_HIGH_PART (got, addr)); | |
1d65abb5 | 267 | entry[1] = RISCV_ITYPE (LREG, X_T3, X_T3, RISCV_PCREL_LOW_PART (got, addr)); |
e23eba97 NC |
268 | entry[2] = RISCV_ITYPE (JALR, X_T1, X_T3, 0); |
269 | entry[3] = RISCV_NOP; | |
5ef23793 | 270 | |
0a1b45a2 | 271 | return true; |
e23eba97 NC |
272 | } |
273 | ||
274 | /* Create an entry in an RISC-V ELF linker hash table. */ | |
275 | ||
276 | static struct bfd_hash_entry * | |
277 | link_hash_newfunc (struct bfd_hash_entry *entry, | |
278 | struct bfd_hash_table *table, const char *string) | |
279 | { | |
280 | /* Allocate the structure if it has not already been allocated by a | |
281 | subclass. */ | |
282 | if (entry == NULL) | |
283 | { | |
284 | entry = | |
285 | bfd_hash_allocate (table, | |
286 | sizeof (struct riscv_elf_link_hash_entry)); | |
287 | if (entry == NULL) | |
288 | return entry; | |
289 | } | |
290 | ||
291 | /* Call the allocation method of the superclass. */ | |
292 | entry = _bfd_elf_link_hash_newfunc (entry, table, string); | |
293 | if (entry != NULL) | |
294 | { | |
295 | struct riscv_elf_link_hash_entry *eh; | |
296 | ||
297 | eh = (struct riscv_elf_link_hash_entry *) entry; | |
e23eba97 NC |
298 | eh->tls_type = GOT_UNKNOWN; |
299 | } | |
300 | ||
301 | return entry; | |
302 | } | |
303 | ||
02dd9d25 | 304 | /* Compute a hash of a local hash entry. We use elf_link_hash_entry |
dcd709e0 NC |
305 | for local symbol so that we can handle local STT_GNU_IFUNC symbols |
306 | as global symbol. We reuse indx and dynstr_index for local symbol | |
307 | hash since they aren't used by global symbols in this backend. */ | |
02dd9d25 NC |
308 | |
309 | static hashval_t | |
310 | riscv_elf_local_htab_hash (const void *ptr) | |
311 | { | |
312 | struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) ptr; | |
313 | return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index); | |
314 | } | |
315 | ||
316 | /* Compare local hash entries. */ | |
317 | ||
318 | static int | |
319 | riscv_elf_local_htab_eq (const void *ptr1, const void *ptr2) | |
320 | { | |
321 | struct elf_link_hash_entry *h1 = (struct elf_link_hash_entry *) ptr1; | |
322 | struct elf_link_hash_entry *h2 = (struct elf_link_hash_entry *) ptr2; | |
323 | ||
324 | return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index; | |
325 | } | |
326 | ||
327 | /* Find and/or create a hash entry for local symbol. */ | |
328 | ||
329 | static struct elf_link_hash_entry * | |
330 | riscv_elf_get_local_sym_hash (struct riscv_elf_link_hash_table *htab, | |
331 | bfd *abfd, const Elf_Internal_Rela *rel, | |
0a1b45a2 | 332 | bool create) |
02dd9d25 NC |
333 | { |
334 | struct riscv_elf_link_hash_entry eh, *ret; | |
335 | asection *sec = abfd->sections; | |
336 | hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id, | |
337 | ELFNN_R_SYM (rel->r_info)); | |
338 | void **slot; | |
339 | ||
340 | eh.elf.indx = sec->id; | |
341 | eh.elf.dynstr_index = ELFNN_R_SYM (rel->r_info); | |
342 | slot = htab_find_slot_with_hash (htab->loc_hash_table, &eh, h, | |
343 | create ? INSERT : NO_INSERT); | |
344 | ||
345 | if (!slot) | |
346 | return NULL; | |
347 | ||
348 | if (*slot) | |
349 | { | |
350 | ret = (struct riscv_elf_link_hash_entry *) *slot; | |
351 | return &ret->elf; | |
352 | } | |
353 | ||
354 | ret = (struct riscv_elf_link_hash_entry *) | |
355 | objalloc_alloc ((struct objalloc *) htab->loc_hash_memory, | |
356 | sizeof (struct riscv_elf_link_hash_entry)); | |
357 | if (ret) | |
358 | { | |
359 | memset (ret, 0, sizeof (*ret)); | |
360 | ret->elf.indx = sec->id; | |
361 | ret->elf.dynstr_index = ELFNN_R_SYM (rel->r_info); | |
362 | ret->elf.dynindx = -1; | |
363 | *slot = ret; | |
364 | } | |
365 | return &ret->elf; | |
366 | } | |
367 | ||
368 | /* Destroy a RISC-V elf linker hash table. */ | |
369 | ||
370 | static void | |
371 | riscv_elf_link_hash_table_free (bfd *obfd) | |
372 | { | |
373 | struct riscv_elf_link_hash_table *ret | |
374 | = (struct riscv_elf_link_hash_table *) obfd->link.hash; | |
375 | ||
376 | if (ret->loc_hash_table) | |
377 | htab_delete (ret->loc_hash_table); | |
378 | if (ret->loc_hash_memory) | |
379 | objalloc_free ((struct objalloc *) ret->loc_hash_memory); | |
380 | ||
381 | _bfd_elf_link_hash_table_free (obfd); | |
382 | } | |
383 | ||
e23eba97 NC |
384 | /* Create a RISC-V ELF linker hash table. */ |
385 | ||
386 | static struct bfd_link_hash_table * | |
387 | riscv_elf_link_hash_table_create (bfd *abfd) | |
388 | { | |
389 | struct riscv_elf_link_hash_table *ret; | |
986f0783 | 390 | size_t amt = sizeof (struct riscv_elf_link_hash_table); |
e23eba97 NC |
391 | |
392 | ret = (struct riscv_elf_link_hash_table *) bfd_zmalloc (amt); | |
393 | if (ret == NULL) | |
394 | return NULL; | |
395 | ||
396 | if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc, | |
397 | sizeof (struct riscv_elf_link_hash_entry), | |
398 | RISCV_ELF_DATA)) | |
399 | { | |
400 | free (ret); | |
401 | return NULL; | |
402 | } | |
403 | ||
fc3c5343 | 404 | ret->max_alignment = (bfd_vma) -1; |
0a1b45a2 | 405 | ret->restart_relax = false; |
02dd9d25 NC |
406 | |
407 | /* Create hash table for local ifunc. */ | |
408 | ret->loc_hash_table = htab_try_create (1024, | |
409 | riscv_elf_local_htab_hash, | |
410 | riscv_elf_local_htab_eq, | |
411 | NULL); | |
412 | ret->loc_hash_memory = objalloc_create (); | |
413 | if (!ret->loc_hash_table || !ret->loc_hash_memory) | |
414 | { | |
415 | riscv_elf_link_hash_table_free (abfd); | |
416 | return NULL; | |
417 | } | |
418 | ret->elf.root.hash_table_free = riscv_elf_link_hash_table_free; | |
419 | ||
e23eba97 NC |
420 | return &ret->elf.root; |
421 | } | |
422 | ||
423 | /* Create the .got section. */ | |
424 | ||
0a1b45a2 | 425 | static bool |
e23eba97 NC |
426 | riscv_elf_create_got_section (bfd *abfd, struct bfd_link_info *info) |
427 | { | |
428 | flagword flags; | |
429 | asection *s, *s_got; | |
430 | struct elf_link_hash_entry *h; | |
431 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); | |
432 | struct elf_link_hash_table *htab = elf_hash_table (info); | |
433 | ||
434 | /* This function may be called more than once. */ | |
ce558b89 | 435 | if (htab->sgot != NULL) |
0a1b45a2 | 436 | return true; |
e23eba97 NC |
437 | |
438 | flags = bed->dynamic_sec_flags; | |
439 | ||
440 | s = bfd_make_section_anyway_with_flags (abfd, | |
441 | (bed->rela_plts_and_copies_p | |
442 | ? ".rela.got" : ".rel.got"), | |
443 | (bed->dynamic_sec_flags | |
444 | | SEC_READONLY)); | |
445 | if (s == NULL | |
fd361982 | 446 | || !bfd_set_section_alignment (s, bed->s->log_file_align)) |
0a1b45a2 | 447 | return false; |
e23eba97 NC |
448 | htab->srelgot = s; |
449 | ||
450 | s = s_got = bfd_make_section_anyway_with_flags (abfd, ".got", flags); | |
451 | if (s == NULL | |
fd361982 | 452 | || !bfd_set_section_alignment (s, bed->s->log_file_align)) |
0a1b45a2 | 453 | return false; |
e23eba97 NC |
454 | htab->sgot = s; |
455 | ||
456 | /* The first bit of the global offset table is the header. */ | |
457 | s->size += bed->got_header_size; | |
458 | ||
459 | if (bed->want_got_plt) | |
460 | { | |
461 | s = bfd_make_section_anyway_with_flags (abfd, ".got.plt", flags); | |
462 | if (s == NULL | |
fd361982 | 463 | || !bfd_set_section_alignment (s, bed->s->log_file_align)) |
0a1b45a2 | 464 | return false; |
e23eba97 NC |
465 | htab->sgotplt = s; |
466 | ||
467 | /* Reserve room for the header. */ | |
468 | s->size += GOTPLT_HEADER_SIZE; | |
469 | } | |
470 | ||
471 | if (bed->want_got_sym) | |
472 | { | |
473 | /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got | |
474 | section. We don't do this in the linker script because we don't want | |
475 | to define the symbol if we are not creating a global offset | |
476 | table. */ | |
477 | h = _bfd_elf_define_linkage_sym (abfd, info, s_got, | |
478 | "_GLOBAL_OFFSET_TABLE_"); | |
479 | elf_hash_table (info)->hgot = h; | |
480 | if (h == NULL) | |
0a1b45a2 | 481 | return false; |
e23eba97 NC |
482 | } |
483 | ||
0a1b45a2 | 484 | return true; |
e23eba97 NC |
485 | } |
486 | ||
487 | /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and | |
488 | .rela.bss sections in DYNOBJ, and set up shortcuts to them in our | |
489 | hash table. */ | |
490 | ||
0a1b45a2 | 491 | static bool |
e23eba97 NC |
492 | riscv_elf_create_dynamic_sections (bfd *dynobj, |
493 | struct bfd_link_info *info) | |
494 | { | |
495 | struct riscv_elf_link_hash_table *htab; | |
496 | ||
497 | htab = riscv_elf_hash_table (info); | |
498 | BFD_ASSERT (htab != NULL); | |
499 | ||
500 | if (!riscv_elf_create_got_section (dynobj, info)) | |
0a1b45a2 | 501 | return false; |
e23eba97 NC |
502 | |
503 | if (!_bfd_elf_create_dynamic_sections (dynobj, info)) | |
0a1b45a2 | 504 | return false; |
e23eba97 | 505 | |
e23eba97 NC |
506 | if (!bfd_link_pic (info)) |
507 | { | |
3e7bd7f2 JW |
508 | /* Technically, this section doesn't have contents. It is used as the |
509 | target of TLS copy relocs, to copy TLS data from shared libraries into | |
510 | the executable. However, if we don't mark it as loadable, then it | |
511 | matches the IS_TBSS test in ldlang.c, and there is no run-time address | |
512 | space allocated for it even though it has SEC_ALLOC. That test is | |
513 | correct for .tbss, but not correct for this section. There is also | |
514 | a second problem that having a section with no contents can only work | |
515 | if it comes after all sections with contents in the same segment, | |
516 | but the linker script does not guarantee that. This is just mixed in | |
517 | with other .tdata.* sections. We can fix both problems by lying and | |
518 | saying that there are contents. This section is expected to be small | |
519 | so this should not cause a significant extra program startup cost. */ | |
e23eba97 NC |
520 | htab->sdyntdata = |
521 | bfd_make_section_anyway_with_flags (dynobj, ".tdata.dyn", | |
13755f40 | 522 | (SEC_ALLOC | SEC_THREAD_LOCAL |
3e7bd7f2 JW |
523 | | SEC_LOAD | SEC_DATA |
524 | | SEC_HAS_CONTENTS | |
13755f40 | 525 | | SEC_LINKER_CREATED)); |
e23eba97 NC |
526 | } |
527 | ||
9d19e4fd AM |
528 | if (!htab->elf.splt || !htab->elf.srelplt || !htab->elf.sdynbss |
529 | || (!bfd_link_pic (info) && (!htab->elf.srelbss || !htab->sdyntdata))) | |
e23eba97 NC |
530 | abort (); |
531 | ||
0a1b45a2 | 532 | return true; |
e23eba97 NC |
533 | } |
534 | ||
535 | /* Copy the extra info we tack onto an elf_link_hash_entry. */ | |
536 | ||
537 | static void | |
538 | riscv_elf_copy_indirect_symbol (struct bfd_link_info *info, | |
539 | struct elf_link_hash_entry *dir, | |
540 | struct elf_link_hash_entry *ind) | |
541 | { | |
542 | struct riscv_elf_link_hash_entry *edir, *eind; | |
543 | ||
544 | edir = (struct riscv_elf_link_hash_entry *) dir; | |
545 | eind = (struct riscv_elf_link_hash_entry *) ind; | |
546 | ||
e23eba97 NC |
547 | if (ind->root.type == bfd_link_hash_indirect |
548 | && dir->got.refcount <= 0) | |
549 | { | |
550 | edir->tls_type = eind->tls_type; | |
551 | eind->tls_type = GOT_UNKNOWN; | |
552 | } | |
553 | _bfd_elf_link_hash_copy_indirect (info, dir, ind); | |
554 | } | |
555 | ||
0a1b45a2 | 556 | static bool |
e23eba97 NC |
557 | riscv_elf_record_tls_type (bfd *abfd, struct elf_link_hash_entry *h, |
558 | unsigned long symndx, char tls_type) | |
559 | { | |
560 | char *new_tls_type = &_bfd_riscv_elf_tls_type (abfd, h, symndx); | |
561 | ||
562 | *new_tls_type |= tls_type; | |
563 | if ((*new_tls_type & GOT_NORMAL) && (*new_tls_type & ~GOT_NORMAL)) | |
564 | { | |
565 | (*_bfd_error_handler) | |
871b3ab2 | 566 | (_("%pB: `%s' accessed both as normal and thread local symbol"), |
e23eba97 | 567 | abfd, h ? h->root.root.string : "<local>"); |
0a1b45a2 | 568 | return false; |
e23eba97 | 569 | } |
0a1b45a2 | 570 | return true; |
e23eba97 NC |
571 | } |
572 | ||
0a1b45a2 | 573 | static bool |
e23eba97 NC |
574 | riscv_elf_record_got_reference (bfd *abfd, struct bfd_link_info *info, |
575 | struct elf_link_hash_entry *h, long symndx) | |
576 | { | |
577 | struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info); | |
578 | Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
579 | ||
580 | if (htab->elf.sgot == NULL) | |
581 | { | |
582 | if (!riscv_elf_create_got_section (htab->elf.dynobj, info)) | |
0a1b45a2 | 583 | return false; |
e23eba97 NC |
584 | } |
585 | ||
586 | if (h != NULL) | |
587 | { | |
588 | h->got.refcount += 1; | |
0a1b45a2 | 589 | return true; |
e23eba97 NC |
590 | } |
591 | ||
592 | /* This is a global offset table entry for a local symbol. */ | |
593 | if (elf_local_got_refcounts (abfd) == NULL) | |
594 | { | |
595 | bfd_size_type size = symtab_hdr->sh_info * (sizeof (bfd_vma) + 1); | |
596 | if (!(elf_local_got_refcounts (abfd) = bfd_zalloc (abfd, size))) | |
0a1b45a2 | 597 | return false; |
e23eba97 NC |
598 | _bfd_riscv_elf_local_got_tls_type (abfd) |
599 | = (char *) (elf_local_got_refcounts (abfd) + symtab_hdr->sh_info); | |
600 | } | |
601 | elf_local_got_refcounts (abfd) [symndx] += 1; | |
602 | ||
0a1b45a2 | 603 | return true; |
e23eba97 NC |
604 | } |
605 | ||
0a1b45a2 | 606 | static bool |
e23eba97 NC |
607 | bad_static_reloc (bfd *abfd, unsigned r_type, struct elf_link_hash_entry *h) |
608 | { | |
f3185997 NC |
609 | reloc_howto_type * r = riscv_elf_rtype_to_howto (abfd, r_type); |
610 | ||
02dd9d25 NC |
611 | /* We propably can improve the information to tell users that they |
612 | should be recompile the code with -fPIC or -fPIE, just like what | |
613 | x86 does. */ | |
e23eba97 | 614 | (*_bfd_error_handler) |
871b3ab2 | 615 | (_("%pB: relocation %s against `%s' can not be used when making a shared " |
e23eba97 | 616 | "object; recompile with -fPIC"), |
f3185997 NC |
617 | abfd, r ? r->name : _("<unknown>"), |
618 | h != NULL ? h->root.root.string : "a local symbol"); | |
e23eba97 | 619 | bfd_set_error (bfd_error_bad_value); |
0a1b45a2 | 620 | return false; |
e23eba97 | 621 | } |
dcd709e0 | 622 | |
e23eba97 NC |
623 | /* Look through the relocs for a section during the first phase, and |
624 | allocate space in the global offset table or procedure linkage | |
625 | table. */ | |
626 | ||
0a1b45a2 | 627 | static bool |
e23eba97 NC |
628 | riscv_elf_check_relocs (bfd *abfd, struct bfd_link_info *info, |
629 | asection *sec, const Elf_Internal_Rela *relocs) | |
630 | { | |
631 | struct riscv_elf_link_hash_table *htab; | |
632 | Elf_Internal_Shdr *symtab_hdr; | |
633 | struct elf_link_hash_entry **sym_hashes; | |
634 | const Elf_Internal_Rela *rel; | |
635 | asection *sreloc = NULL; | |
636 | ||
637 | if (bfd_link_relocatable (info)) | |
0a1b45a2 | 638 | return true; |
e23eba97 NC |
639 | |
640 | htab = riscv_elf_hash_table (info); | |
641 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
642 | sym_hashes = elf_sym_hashes (abfd); | |
643 | ||
644 | if (htab->elf.dynobj == NULL) | |
645 | htab->elf.dynobj = abfd; | |
646 | ||
647 | for (rel = relocs; rel < relocs + sec->reloc_count; rel++) | |
648 | { | |
649 | unsigned int r_type; | |
d42c267e | 650 | unsigned int r_symndx; |
e23eba97 NC |
651 | struct elf_link_hash_entry *h; |
652 | ||
653 | r_symndx = ELFNN_R_SYM (rel->r_info); | |
654 | r_type = ELFNN_R_TYPE (rel->r_info); | |
655 | ||
656 | if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) | |
657 | { | |
871b3ab2 | 658 | (*_bfd_error_handler) (_("%pB: bad symbol index: %d"), |
e23eba97 | 659 | abfd, r_symndx); |
0a1b45a2 | 660 | return false; |
e23eba97 NC |
661 | } |
662 | ||
663 | if (r_symndx < symtab_hdr->sh_info) | |
02dd9d25 NC |
664 | { |
665 | /* A local symbol. */ | |
666 | Elf_Internal_Sym *isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache, | |
667 | abfd, r_symndx); | |
668 | if (isym == NULL) | |
0a1b45a2 | 669 | return false; |
02dd9d25 NC |
670 | |
671 | /* Check relocation against local STT_GNU_IFUNC symbol. */ | |
672 | if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) | |
673 | { | |
0a1b45a2 | 674 | h = riscv_elf_get_local_sym_hash (htab, abfd, rel, true); |
02dd9d25 | 675 | if (h == NULL) |
0a1b45a2 | 676 | return false; |
02dd9d25 NC |
677 | |
678 | /* Fake STT_GNU_IFUNC global symbol. */ | |
679 | h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr, | |
680 | isym, NULL); | |
681 | h->type = STT_GNU_IFUNC; | |
682 | h->def_regular = 1; | |
683 | h->ref_regular = 1; | |
684 | h->forced_local = 1; | |
685 | h->root.type = bfd_link_hash_defined; | |
686 | } | |
687 | else | |
688 | h = NULL; | |
689 | } | |
e23eba97 NC |
690 | else |
691 | { | |
692 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
693 | while (h->root.type == bfd_link_hash_indirect | |
694 | || h->root.type == bfd_link_hash_warning) | |
695 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
e23eba97 NC |
696 | } |
697 | ||
02dd9d25 NC |
698 | if (h != NULL) |
699 | { | |
700 | switch (r_type) | |
701 | { | |
702 | case R_RISCV_32: | |
703 | case R_RISCV_64: | |
704 | case R_RISCV_CALL: | |
705 | case R_RISCV_CALL_PLT: | |
706 | case R_RISCV_HI20: | |
707 | case R_RISCV_GOT_HI20: | |
708 | case R_RISCV_PCREL_HI20: | |
709 | /* Create the ifunc sections, iplt and ipltgot, for static | |
710 | executables. */ | |
711 | if (h->type == STT_GNU_IFUNC | |
712 | && !_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info)) | |
0a1b45a2 | 713 | return false; |
02dd9d25 NC |
714 | break; |
715 | ||
716 | default: | |
717 | break; | |
718 | } | |
719 | ||
720 | /* It is referenced by a non-shared object. */ | |
721 | h->ref_regular = 1; | |
722 | } | |
723 | ||
e23eba97 NC |
724 | switch (r_type) |
725 | { | |
726 | case R_RISCV_TLS_GD_HI20: | |
727 | if (!riscv_elf_record_got_reference (abfd, info, h, r_symndx) | |
728 | || !riscv_elf_record_tls_type (abfd, h, r_symndx, GOT_TLS_GD)) | |
0a1b45a2 | 729 | return false; |
e23eba97 NC |
730 | break; |
731 | ||
732 | case R_RISCV_TLS_GOT_HI20: | |
733 | if (bfd_link_pic (info)) | |
734 | info->flags |= DF_STATIC_TLS; | |
735 | if (!riscv_elf_record_got_reference (abfd, info, h, r_symndx) | |
736 | || !riscv_elf_record_tls_type (abfd, h, r_symndx, GOT_TLS_IE)) | |
0a1b45a2 | 737 | return false; |
e23eba97 NC |
738 | break; |
739 | ||
740 | case R_RISCV_GOT_HI20: | |
741 | if (!riscv_elf_record_got_reference (abfd, info, h, r_symndx) | |
742 | || !riscv_elf_record_tls_type (abfd, h, r_symndx, GOT_NORMAL)) | |
0a1b45a2 | 743 | return false; |
e23eba97 NC |
744 | break; |
745 | ||
3b1450b3 | 746 | case R_RISCV_CALL: |
e23eba97 | 747 | case R_RISCV_CALL_PLT: |
dcd709e0 NC |
748 | /* These symbol requires a procedure linkage table entry. |
749 | We actually build the entry in adjust_dynamic_symbol, | |
3b1450b3 | 750 | because these might be a case of linking PIC code without |
e23eba97 NC |
751 | linking in any dynamic objects, in which case we don't |
752 | need to generate a procedure linkage table after all. */ | |
753 | ||
3b1450b3 NC |
754 | /* If it is a local symbol, then we resolve it directly |
755 | without creating a PLT entry. */ | |
756 | if (h == NULL) | |
757 | continue; | |
758 | ||
759 | h->needs_plt = 1; | |
760 | h->plt.refcount += 1; | |
e23eba97 NC |
761 | break; |
762 | ||
02dd9d25 NC |
763 | case R_RISCV_PCREL_HI20: |
764 | if (h != NULL | |
765 | && h->type == STT_GNU_IFUNC) | |
766 | { | |
767 | h->non_got_ref = 1; | |
768 | h->pointer_equality_needed = 1; | |
769 | ||
770 | /* We don't use the PCREL_HI20 in the data section, | |
771 | so we always need the plt when it refers to | |
772 | ifunc symbol. */ | |
773 | h->plt.refcount += 1; | |
774 | } | |
775 | /* Fall through. */ | |
776 | ||
e23eba97 NC |
777 | case R_RISCV_JAL: |
778 | case R_RISCV_BRANCH: | |
779 | case R_RISCV_RVC_BRANCH: | |
780 | case R_RISCV_RVC_JUMP: | |
02dd9d25 NC |
781 | /* In shared libraries and pie, these relocs are known |
782 | to bind locally. */ | |
e23eba97 NC |
783 | if (bfd_link_pic (info)) |
784 | break; | |
785 | goto static_reloc; | |
786 | ||
787 | case R_RISCV_TPREL_HI20: | |
788 | if (!bfd_link_executable (info)) | |
789 | return bad_static_reloc (abfd, r_type, h); | |
790 | if (h != NULL) | |
791 | riscv_elf_record_tls_type (abfd, h, r_symndx, GOT_TLS_LE); | |
792 | goto static_reloc; | |
793 | ||
794 | case R_RISCV_HI20: | |
795 | if (bfd_link_pic (info)) | |
796 | return bad_static_reloc (abfd, r_type, h); | |
797 | /* Fall through. */ | |
798 | ||
799 | case R_RISCV_COPY: | |
800 | case R_RISCV_JUMP_SLOT: | |
801 | case R_RISCV_RELATIVE: | |
802 | case R_RISCV_64: | |
803 | case R_RISCV_32: | |
804 | /* Fall through. */ | |
805 | ||
806 | static_reloc: | |
e23eba97 | 807 | |
02dd9d25 NC |
808 | if (h != NULL |
809 | && (!bfd_link_pic (info) | |
810 | || h->type == STT_GNU_IFUNC)) | |
e23eba97 | 811 | { |
02dd9d25 NC |
812 | /* This reloc might not bind locally. */ |
813 | h->non_got_ref = 1; | |
814 | h->pointer_equality_needed = 1; | |
815 | ||
816 | if (!h->def_regular | |
817 | || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0) | |
818 | { | |
819 | /* We may need a .plt entry if the symbol is a function | |
820 | defined in a shared lib or is a function referenced | |
821 | from the code or read-only section. */ | |
822 | h->plt.refcount += 1; | |
823 | } | |
e23eba97 NC |
824 | } |
825 | ||
826 | /* If we are creating a shared library, and this is a reloc | |
827 | against a global symbol, or a non PC relative reloc | |
828 | against a local symbol, then we need to copy the reloc | |
829 | into the shared library. However, if we are linking with | |
830 | -Bsymbolic, we do not need to copy a reloc against a | |
831 | global symbol which is defined in an object we are | |
832 | including in the link (i.e., DEF_REGULAR is set). At | |
833 | this point we have not seen all the input files, so it is | |
834 | possible that DEF_REGULAR is not set now but will be set | |
835 | later (it is never cleared). In case of a weak definition, | |
836 | DEF_REGULAR may be cleared later by a strong definition in | |
837 | a shared library. We account for that possibility below by | |
838 | storing information in the relocs_copied field of the hash | |
839 | table entry. A similar situation occurs when creating | |
840 | shared libraries and symbol visibility changes render the | |
841 | symbol local. | |
842 | ||
843 | If on the other hand, we are creating an executable, we | |
844 | may need to keep relocations for symbols satisfied by a | |
845 | dynamic library if we manage to avoid copy relocs for the | |
02dd9d25 NC |
846 | symbol. |
847 | ||
848 | Generate dynamic pointer relocation against STT_GNU_IFUNC | |
849 | symbol in the non-code section (R_RISCV_32/R_RISCV_64). */ | |
f3185997 NC |
850 | reloc_howto_type * r = riscv_elf_rtype_to_howto (abfd, r_type); |
851 | ||
e23eba97 NC |
852 | if ((bfd_link_pic (info) |
853 | && (sec->flags & SEC_ALLOC) != 0 | |
02dd9d25 | 854 | && ((r != NULL && !r->pc_relative) |
e23eba97 | 855 | || (h != NULL |
02dd9d25 | 856 | && (!info->symbolic |
e23eba97 NC |
857 | || h->root.type == bfd_link_hash_defweak |
858 | || !h->def_regular)))) | |
859 | || (!bfd_link_pic (info) | |
860 | && (sec->flags & SEC_ALLOC) != 0 | |
861 | && h != NULL | |
862 | && (h->root.type == bfd_link_hash_defweak | |
02dd9d25 NC |
863 | || !h->def_regular)) |
864 | || (!bfd_link_pic (info) | |
865 | && h != NULL | |
866 | && h->type == STT_GNU_IFUNC | |
867 | && (sec->flags & SEC_CODE) == 0)) | |
e23eba97 | 868 | { |
3bf083ed AM |
869 | struct elf_dyn_relocs *p; |
870 | struct elf_dyn_relocs **head; | |
e23eba97 NC |
871 | |
872 | /* When creating a shared object, we must copy these | |
873 | relocs into the output file. We create a reloc | |
874 | section in dynobj and make room for the reloc. */ | |
875 | if (sreloc == NULL) | |
876 | { | |
877 | sreloc = _bfd_elf_make_dynamic_reloc_section | |
878 | (sec, htab->elf.dynobj, RISCV_ELF_LOG_WORD_BYTES, | |
0a1b45a2 | 879 | abfd, /*rela?*/ true); |
e23eba97 NC |
880 | |
881 | if (sreloc == NULL) | |
0a1b45a2 | 882 | return false; |
e23eba97 NC |
883 | } |
884 | ||
885 | /* If this is a global symbol, we count the number of | |
886 | relocations we need for this symbol. */ | |
887 | if (h != NULL) | |
190eb1dd | 888 | head = &h->dyn_relocs; |
e23eba97 NC |
889 | else |
890 | { | |
891 | /* Track dynamic relocs needed for local syms too. | |
892 | We really need local syms available to do this | |
893 | easily. Oh well. */ | |
894 | ||
895 | asection *s; | |
896 | void *vpp; | |
897 | Elf_Internal_Sym *isym; | |
898 | ||
f1dfbfdb | 899 | isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache, |
e23eba97 NC |
900 | abfd, r_symndx); |
901 | if (isym == NULL) | |
0a1b45a2 | 902 | return false; |
e23eba97 NC |
903 | |
904 | s = bfd_section_from_elf_index (abfd, isym->st_shndx); | |
905 | if (s == NULL) | |
906 | s = sec; | |
907 | ||
908 | vpp = &elf_section_data (s)->local_dynrel; | |
3bf083ed | 909 | head = (struct elf_dyn_relocs **) vpp; |
e23eba97 NC |
910 | } |
911 | ||
912 | p = *head; | |
913 | if (p == NULL || p->sec != sec) | |
914 | { | |
986f0783 | 915 | size_t amt = sizeof *p; |
3bf083ed | 916 | p = ((struct elf_dyn_relocs *) |
e23eba97 NC |
917 | bfd_alloc (htab->elf.dynobj, amt)); |
918 | if (p == NULL) | |
0a1b45a2 | 919 | return false; |
e23eba97 NC |
920 | p->next = *head; |
921 | *head = p; | |
922 | p->sec = sec; | |
923 | p->count = 0; | |
924 | p->pc_count = 0; | |
925 | } | |
926 | ||
927 | p->count += 1; | |
f3185997 | 928 | p->pc_count += r == NULL ? 0 : r->pc_relative; |
e23eba97 NC |
929 | } |
930 | ||
931 | break; | |
932 | ||
933 | case R_RISCV_GNU_VTINHERIT: | |
934 | if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) | |
0a1b45a2 | 935 | return false; |
e23eba97 NC |
936 | break; |
937 | ||
938 | case R_RISCV_GNU_VTENTRY: | |
939 | if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) | |
0a1b45a2 | 940 | return false; |
e23eba97 NC |
941 | break; |
942 | ||
943 | default: | |
944 | break; | |
945 | } | |
946 | } | |
947 | ||
0a1b45a2 | 948 | return true; |
e23eba97 NC |
949 | } |
950 | ||
951 | static asection * | |
952 | riscv_elf_gc_mark_hook (asection *sec, | |
953 | struct bfd_link_info *info, | |
954 | Elf_Internal_Rela *rel, | |
955 | struct elf_link_hash_entry *h, | |
956 | Elf_Internal_Sym *sym) | |
957 | { | |
958 | if (h != NULL) | |
959 | switch (ELFNN_R_TYPE (rel->r_info)) | |
960 | { | |
961 | case R_RISCV_GNU_VTINHERIT: | |
962 | case R_RISCV_GNU_VTENTRY: | |
963 | return NULL; | |
964 | } | |
965 | ||
966 | return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); | |
967 | } | |
968 | ||
e23eba97 NC |
969 | /* Adjust a symbol defined by a dynamic object and referenced by a |
970 | regular object. The current definition is in some section of the | |
971 | dynamic object, but we're not including those sections. We have to | |
972 | change the definition to something the rest of the link can | |
973 | understand. */ | |
974 | ||
0a1b45a2 | 975 | static bool |
e23eba97 NC |
976 | riscv_elf_adjust_dynamic_symbol (struct bfd_link_info *info, |
977 | struct elf_link_hash_entry *h) | |
978 | { | |
979 | struct riscv_elf_link_hash_table *htab; | |
980 | struct riscv_elf_link_hash_entry * eh; | |
e23eba97 | 981 | bfd *dynobj; |
5474d94f | 982 | asection *s, *srel; |
e23eba97 NC |
983 | |
984 | htab = riscv_elf_hash_table (info); | |
985 | BFD_ASSERT (htab != NULL); | |
986 | ||
987 | dynobj = htab->elf.dynobj; | |
988 | ||
989 | /* Make sure we know what is going on here. */ | |
990 | BFD_ASSERT (dynobj != NULL | |
991 | && (h->needs_plt | |
992 | || h->type == STT_GNU_IFUNC | |
60d67dc8 | 993 | || h->is_weakalias |
e23eba97 NC |
994 | || (h->def_dynamic |
995 | && h->ref_regular | |
996 | && !h->def_regular))); | |
997 | ||
998 | /* If this is a function, put it in the procedure linkage table. We | |
999 | will fill in the contents of the procedure linkage table later | |
1000 | (although we could actually do it here). */ | |
1001 | if (h->type == STT_FUNC || h->type == STT_GNU_IFUNC || h->needs_plt) | |
1002 | { | |
1003 | if (h->plt.refcount <= 0 | |
02dd9d25 NC |
1004 | || (h->type != STT_GNU_IFUNC |
1005 | && (SYMBOL_CALLS_LOCAL (info, h) | |
1006 | || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT | |
1007 | && h->root.type == bfd_link_hash_undefweak)))) | |
e23eba97 NC |
1008 | { |
1009 | /* This case can occur if we saw a R_RISCV_CALL_PLT reloc in an | |
1010 | input file, but the symbol was never referred to by a dynamic | |
1011 | object, or if all references were garbage collected. In such | |
1012 | a case, we don't actually need to build a PLT entry. */ | |
1013 | h->plt.offset = (bfd_vma) -1; | |
1014 | h->needs_plt = 0; | |
1015 | } | |
1016 | ||
0a1b45a2 | 1017 | return true; |
e23eba97 NC |
1018 | } |
1019 | else | |
1020 | h->plt.offset = (bfd_vma) -1; | |
1021 | ||
1022 | /* If this is a weak symbol, and there is a real definition, the | |
1023 | processor independent code will have arranged for us to see the | |
1024 | real definition first, and we can just use the same value. */ | |
60d67dc8 | 1025 | if (h->is_weakalias) |
e23eba97 | 1026 | { |
60d67dc8 AM |
1027 | struct elf_link_hash_entry *def = weakdef (h); |
1028 | BFD_ASSERT (def->root.type == bfd_link_hash_defined); | |
1029 | h->root.u.def.section = def->root.u.def.section; | |
1030 | h->root.u.def.value = def->root.u.def.value; | |
0a1b45a2 | 1031 | return true; |
e23eba97 NC |
1032 | } |
1033 | ||
1034 | /* This is a reference to a symbol defined by a dynamic object which | |
1035 | is not a function. */ | |
1036 | ||
1037 | /* If we are creating a shared library, we must presume that the | |
1038 | only references to the symbol are via the global offset table. | |
1039 | For such cases we need not do anything here; the relocations will | |
1040 | be handled correctly by relocate_section. */ | |
1041 | if (bfd_link_pic (info)) | |
0a1b45a2 | 1042 | return true; |
e23eba97 NC |
1043 | |
1044 | /* If there are no references to this symbol that do not use the | |
1045 | GOT, we don't need to generate a copy reloc. */ | |
1046 | if (!h->non_got_ref) | |
0a1b45a2 | 1047 | return true; |
e23eba97 NC |
1048 | |
1049 | /* If -z nocopyreloc was given, we won't generate them either. */ | |
1050 | if (info->nocopyreloc) | |
1051 | { | |
1052 | h->non_got_ref = 0; | |
0a1b45a2 | 1053 | return true; |
e23eba97 NC |
1054 | } |
1055 | ||
3bf083ed | 1056 | /* If we don't find any dynamic relocs in read-only sections, then |
e23eba97 | 1057 | we'll be keeping the dynamic relocs and avoiding the copy reloc. */ |
5dbc8b37 | 1058 | if (!_bfd_elf_readonly_dynrelocs (h)) |
e23eba97 NC |
1059 | { |
1060 | h->non_got_ref = 0; | |
0a1b45a2 | 1061 | return true; |
e23eba97 NC |
1062 | } |
1063 | ||
1064 | /* We must allocate the symbol in our .dynbss section, which will | |
1065 | become part of the .bss section of the executable. There will be | |
1066 | an entry for this symbol in the .dynsym section. The dynamic | |
1067 | object will contain position independent code, so all references | |
1068 | from the dynamic object to this symbol will go through the global | |
1069 | offset table. The dynamic linker will use the .dynsym entry to | |
1070 | determine the address it must put in the global offset table, so | |
1071 | both the dynamic object and the regular object will refer to the | |
1072 | same memory location for the variable. */ | |
1073 | ||
1074 | /* We must generate a R_RISCV_COPY reloc to tell the dynamic linker | |
1075 | to copy the initial value out of the dynamic object and into the | |
1076 | runtime process image. We need to remember the offset into the | |
1077 | .rel.bss section we are going to use. */ | |
3bf083ed | 1078 | eh = (struct riscv_elf_link_hash_entry *) h; |
3df5cd13 AW |
1079 | if (eh->tls_type & ~GOT_NORMAL) |
1080 | { | |
1081 | s = htab->sdyntdata; | |
1082 | srel = htab->elf.srelbss; | |
1083 | } | |
1084 | else if ((h->root.u.def.section->flags & SEC_READONLY) != 0) | |
5474d94f AM |
1085 | { |
1086 | s = htab->elf.sdynrelro; | |
1087 | srel = htab->elf.sreldynrelro; | |
1088 | } | |
1089 | else | |
1090 | { | |
1091 | s = htab->elf.sdynbss; | |
1092 | srel = htab->elf.srelbss; | |
1093 | } | |
e23eba97 NC |
1094 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) |
1095 | { | |
5474d94f | 1096 | srel->size += sizeof (ElfNN_External_Rela); |
e23eba97 NC |
1097 | h->needs_copy = 1; |
1098 | } | |
1099 | ||
5474d94f | 1100 | return _bfd_elf_adjust_dynamic_copy (info, h, s); |
e23eba97 NC |
1101 | } |
1102 | ||
1103 | /* Allocate space in .plt, .got and associated reloc sections for | |
1104 | dynamic relocs. */ | |
1105 | ||
0a1b45a2 | 1106 | static bool |
e23eba97 NC |
1107 | allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) |
1108 | { | |
1109 | struct bfd_link_info *info; | |
1110 | struct riscv_elf_link_hash_table *htab; | |
3bf083ed | 1111 | struct elf_dyn_relocs *p; |
e23eba97 NC |
1112 | |
1113 | if (h->root.type == bfd_link_hash_indirect) | |
0a1b45a2 | 1114 | return true; |
e23eba97 NC |
1115 | |
1116 | info = (struct bfd_link_info *) inf; | |
1117 | htab = riscv_elf_hash_table (info); | |
1118 | BFD_ASSERT (htab != NULL); | |
1119 | ||
18b98722 NC |
1120 | /* When we are generating pde, make sure gp symbol is output as a |
1121 | dynamic symbol. Then ld.so can set the gp register earlier, before | |
1122 | resolving the ifunc. */ | |
1123 | if (!bfd_link_pic (info) | |
1124 | && htab->elf.dynamic_sections_created | |
1125 | && strcmp (h->root.root.string, RISCV_GP_SYMBOL) == 0 | |
1126 | && !bfd_elf_link_record_dynamic_symbol (info, h)) | |
0a1b45a2 | 1127 | return false; |
18b98722 | 1128 | |
02dd9d25 NC |
1129 | /* Since STT_GNU_IFUNC symbols must go through PLT, we handle them |
1130 | in the allocate_ifunc_dynrelocs and allocate_local_ifunc_dynrelocs, | |
1131 | if they are defined and referenced in a non-shared object. */ | |
1132 | if (h->type == STT_GNU_IFUNC | |
1133 | && h->def_regular) | |
0a1b45a2 | 1134 | return true; |
02dd9d25 NC |
1135 | else if (htab->elf.dynamic_sections_created |
1136 | && h->plt.refcount > 0) | |
e23eba97 NC |
1137 | { |
1138 | /* Make sure this symbol is output as a dynamic symbol. | |
1139 | Undefined weak syms won't yet be marked as dynamic. */ | |
1140 | if (h->dynindx == -1 | |
1141 | && !h->forced_local) | |
1142 | { | |
1143 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) | |
0a1b45a2 | 1144 | return false; |
e23eba97 NC |
1145 | } |
1146 | ||
1147 | if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, bfd_link_pic (info), h)) | |
1148 | { | |
1149 | asection *s = htab->elf.splt; | |
1150 | ||
1151 | if (s->size == 0) | |
1152 | s->size = PLT_HEADER_SIZE; | |
1153 | ||
1154 | h->plt.offset = s->size; | |
1155 | ||
1156 | /* Make room for this entry. */ | |
1157 | s->size += PLT_ENTRY_SIZE; | |
1158 | ||
1159 | /* We also need to make an entry in the .got.plt section. */ | |
1160 | htab->elf.sgotplt->size += GOT_ENTRY_SIZE; | |
1161 | ||
1162 | /* We also need to make an entry in the .rela.plt section. */ | |
1163 | htab->elf.srelplt->size += sizeof (ElfNN_External_Rela); | |
1164 | ||
1165 | /* If this symbol is not defined in a regular file, and we are | |
1166 | not generating a shared library, then set the symbol to this | |
1167 | location in the .plt. This is required to make function | |
1168 | pointers compare as equal between the normal executable and | |
1169 | the shared library. */ | |
1170 | if (! bfd_link_pic (info) | |
1171 | && !h->def_regular) | |
1172 | { | |
1173 | h->root.u.def.section = s; | |
1174 | h->root.u.def.value = h->plt.offset; | |
1175 | } | |
1176 | } | |
1177 | else | |
1178 | { | |
1179 | h->plt.offset = (bfd_vma) -1; | |
1180 | h->needs_plt = 0; | |
1181 | } | |
1182 | } | |
1183 | else | |
1184 | { | |
1185 | h->plt.offset = (bfd_vma) -1; | |
1186 | h->needs_plt = 0; | |
1187 | } | |
1188 | ||
1189 | if (h->got.refcount > 0) | |
1190 | { | |
1191 | asection *s; | |
0a1b45a2 | 1192 | bool dyn; |
e23eba97 NC |
1193 | int tls_type = riscv_elf_hash_entry (h)->tls_type; |
1194 | ||
1195 | /* Make sure this symbol is output as a dynamic symbol. | |
1196 | Undefined weak syms won't yet be marked as dynamic. */ | |
1197 | if (h->dynindx == -1 | |
1198 | && !h->forced_local) | |
1199 | { | |
1200 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) | |
0a1b45a2 | 1201 | return false; |
e23eba97 NC |
1202 | } |
1203 | ||
1204 | s = htab->elf.sgot; | |
1205 | h->got.offset = s->size; | |
1206 | dyn = htab->elf.dynamic_sections_created; | |
1207 | if (tls_type & (GOT_TLS_GD | GOT_TLS_IE)) | |
1208 | { | |
1209 | /* TLS_GD needs two dynamic relocs and two GOT slots. */ | |
1210 | if (tls_type & GOT_TLS_GD) | |
1211 | { | |
1212 | s->size += 2 * RISCV_ELF_WORD_BYTES; | |
1213 | htab->elf.srelgot->size += 2 * sizeof (ElfNN_External_Rela); | |
1214 | } | |
1215 | ||
1216 | /* TLS_IE needs one dynamic reloc and one GOT slot. */ | |
1217 | if (tls_type & GOT_TLS_IE) | |
1218 | { | |
1219 | s->size += RISCV_ELF_WORD_BYTES; | |
1220 | htab->elf.srelgot->size += sizeof (ElfNN_External_Rela); | |
1221 | } | |
1222 | } | |
1223 | else | |
1224 | { | |
1225 | s->size += RISCV_ELF_WORD_BYTES; | |
6487709f JW |
1226 | if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, bfd_link_pic (info), h) |
1227 | && ! UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)) | |
e23eba97 NC |
1228 | htab->elf.srelgot->size += sizeof (ElfNN_External_Rela); |
1229 | } | |
1230 | } | |
1231 | else | |
1232 | h->got.offset = (bfd_vma) -1; | |
1233 | ||
190eb1dd | 1234 | if (h->dyn_relocs == NULL) |
0a1b45a2 | 1235 | return true; |
e23eba97 NC |
1236 | |
1237 | /* In the shared -Bsymbolic case, discard space allocated for | |
1238 | dynamic pc-relative relocs against symbols which turn out to be | |
1239 | defined in regular objects. For the normal shared case, discard | |
1240 | space for pc-relative relocs that have become local due to symbol | |
1241 | visibility changes. */ | |
1242 | ||
1243 | if (bfd_link_pic (info)) | |
1244 | { | |
1245 | if (SYMBOL_CALLS_LOCAL (info, h)) | |
1246 | { | |
3bf083ed | 1247 | struct elf_dyn_relocs **pp; |
e23eba97 | 1248 | |
190eb1dd | 1249 | for (pp = &h->dyn_relocs; (p = *pp) != NULL; ) |
e23eba97 NC |
1250 | { |
1251 | p->count -= p->pc_count; | |
1252 | p->pc_count = 0; | |
1253 | if (p->count == 0) | |
1254 | *pp = p->next; | |
1255 | else | |
1256 | pp = &p->next; | |
1257 | } | |
1258 | } | |
1259 | ||
1260 | /* Also discard relocs on undefined weak syms with non-default | |
1261 | visibility. */ | |
190eb1dd | 1262 | if (h->dyn_relocs != NULL |
e23eba97 NC |
1263 | && h->root.type == bfd_link_hash_undefweak) |
1264 | { | |
6487709f JW |
1265 | if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT |
1266 | || UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)) | |
190eb1dd | 1267 | h->dyn_relocs = NULL; |
e23eba97 NC |
1268 | |
1269 | /* Make sure undefined weak symbols are output as a dynamic | |
1270 | symbol in PIEs. */ | |
1271 | else if (h->dynindx == -1 | |
1272 | && !h->forced_local) | |
1273 | { | |
1274 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) | |
0a1b45a2 | 1275 | return false; |
e23eba97 NC |
1276 | } |
1277 | } | |
1278 | } | |
1279 | else | |
1280 | { | |
1281 | /* For the non-shared case, discard space for relocs against | |
1282 | symbols which turn out to need copy relocs or are not | |
1283 | dynamic. */ | |
1284 | ||
1285 | if (!h->non_got_ref | |
1286 | && ((h->def_dynamic | |
1287 | && !h->def_regular) | |
1288 | || (htab->elf.dynamic_sections_created | |
1289 | && (h->root.type == bfd_link_hash_undefweak | |
1290 | || h->root.type == bfd_link_hash_undefined)))) | |
1291 | { | |
1292 | /* Make sure this symbol is output as a dynamic symbol. | |
1293 | Undefined weak syms won't yet be marked as dynamic. */ | |
1294 | if (h->dynindx == -1 | |
1295 | && !h->forced_local) | |
1296 | { | |
1297 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) | |
0a1b45a2 | 1298 | return false; |
e23eba97 NC |
1299 | } |
1300 | ||
1301 | /* If that succeeded, we know we'll be keeping all the | |
1302 | relocs. */ | |
1303 | if (h->dynindx != -1) | |
1304 | goto keep; | |
1305 | } | |
1306 | ||
190eb1dd | 1307 | h->dyn_relocs = NULL; |
e23eba97 NC |
1308 | |
1309 | keep: ; | |
1310 | } | |
1311 | ||
1312 | /* Finally, allocate space. */ | |
190eb1dd | 1313 | for (p = h->dyn_relocs; p != NULL; p = p->next) |
e23eba97 NC |
1314 | { |
1315 | asection *sreloc = elf_section_data (p->sec)->sreloc; | |
1316 | sreloc->size += p->count * sizeof (ElfNN_External_Rela); | |
1317 | } | |
1318 | ||
0a1b45a2 | 1319 | return true; |
e23eba97 NC |
1320 | } |
1321 | ||
02dd9d25 NC |
1322 | /* Allocate space in .plt, .got and associated reloc sections for |
1323 | ifunc dynamic relocs. */ | |
1324 | ||
0a1b45a2 | 1325 | static bool |
02dd9d25 NC |
1326 | allocate_ifunc_dynrelocs (struct elf_link_hash_entry *h, |
1327 | void *inf) | |
1328 | { | |
1329 | struct bfd_link_info *info; | |
1330 | ||
1331 | if (h->root.type == bfd_link_hash_indirect) | |
0a1b45a2 | 1332 | return true; |
02dd9d25 NC |
1333 | |
1334 | if (h->root.type == bfd_link_hash_warning) | |
1335 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
1336 | ||
1337 | info = (struct bfd_link_info *) inf; | |
1338 | ||
1339 | /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it | |
1340 | here if it is defined and referenced in a non-shared object. */ | |
1341 | if (h->type == STT_GNU_IFUNC | |
1342 | && h->def_regular) | |
1343 | return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, | |
1344 | &h->dyn_relocs, | |
1345 | PLT_ENTRY_SIZE, | |
1346 | PLT_HEADER_SIZE, | |
1347 | GOT_ENTRY_SIZE, | |
0a1b45a2 AM |
1348 | true); |
1349 | return true; | |
02dd9d25 NC |
1350 | } |
1351 | ||
1352 | /* Allocate space in .plt, .got and associated reloc sections for | |
1353 | local ifunc dynamic relocs. */ | |
1354 | ||
1201fda6 | 1355 | static int |
02dd9d25 NC |
1356 | allocate_local_ifunc_dynrelocs (void **slot, void *inf) |
1357 | { | |
1358 | struct elf_link_hash_entry *h | |
1359 | = (struct elf_link_hash_entry *) *slot; | |
1360 | ||
1361 | if (h->type != STT_GNU_IFUNC | |
1362 | || !h->def_regular | |
1363 | || !h->ref_regular | |
1364 | || !h->forced_local | |
1365 | || h->root.type != bfd_link_hash_defined) | |
1366 | abort (); | |
1367 | ||
1368 | return allocate_ifunc_dynrelocs (h, inf); | |
1369 | } | |
1370 | ||
0a1b45a2 | 1371 | static bool |
e23eba97 NC |
1372 | riscv_elf_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) |
1373 | { | |
1374 | struct riscv_elf_link_hash_table *htab; | |
1375 | bfd *dynobj; | |
1376 | asection *s; | |
1377 | bfd *ibfd; | |
1378 | ||
1379 | htab = riscv_elf_hash_table (info); | |
1380 | BFD_ASSERT (htab != NULL); | |
1381 | dynobj = htab->elf.dynobj; | |
1382 | BFD_ASSERT (dynobj != NULL); | |
1383 | ||
1384 | if (elf_hash_table (info)->dynamic_sections_created) | |
1385 | { | |
1386 | /* Set the contents of the .interp section to the interpreter. */ | |
1387 | if (bfd_link_executable (info) && !info->nointerp) | |
1388 | { | |
1389 | s = bfd_get_linker_section (dynobj, ".interp"); | |
1390 | BFD_ASSERT (s != NULL); | |
1391 | s->size = strlen (ELFNN_DYNAMIC_INTERPRETER) + 1; | |
1392 | s->contents = (unsigned char *) ELFNN_DYNAMIC_INTERPRETER; | |
1393 | } | |
1394 | } | |
1395 | ||
1396 | /* Set up .got offsets for local syms, and space for local dynamic | |
1397 | relocs. */ | |
1398 | for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next) | |
1399 | { | |
1400 | bfd_signed_vma *local_got; | |
1401 | bfd_signed_vma *end_local_got; | |
1402 | char *local_tls_type; | |
1403 | bfd_size_type locsymcount; | |
1404 | Elf_Internal_Shdr *symtab_hdr; | |
1405 | asection *srel; | |
1406 | ||
1407 | if (! is_riscv_elf (ibfd)) | |
1408 | continue; | |
1409 | ||
1410 | for (s = ibfd->sections; s != NULL; s = s->next) | |
1411 | { | |
3bf083ed | 1412 | struct elf_dyn_relocs *p; |
e23eba97 NC |
1413 | |
1414 | for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next) | |
1415 | { | |
1416 | if (!bfd_is_abs_section (p->sec) | |
1417 | && bfd_is_abs_section (p->sec->output_section)) | |
1418 | { | |
1419 | /* Input section has been discarded, either because | |
1420 | it is a copy of a linkonce section or due to | |
1421 | linker script /DISCARD/, so we'll be discarding | |
1422 | the relocs too. */ | |
1423 | } | |
1424 | else if (p->count != 0) | |
1425 | { | |
1426 | srel = elf_section_data (p->sec)->sreloc; | |
1427 | srel->size += p->count * sizeof (ElfNN_External_Rela); | |
1428 | if ((p->sec->output_section->flags & SEC_READONLY) != 0) | |
1429 | info->flags |= DF_TEXTREL; | |
1430 | } | |
1431 | } | |
1432 | } | |
1433 | ||
1434 | local_got = elf_local_got_refcounts (ibfd); | |
1435 | if (!local_got) | |
1436 | continue; | |
1437 | ||
1438 | symtab_hdr = &elf_symtab_hdr (ibfd); | |
1439 | locsymcount = symtab_hdr->sh_info; | |
1440 | end_local_got = local_got + locsymcount; | |
1441 | local_tls_type = _bfd_riscv_elf_local_got_tls_type (ibfd); | |
1442 | s = htab->elf.sgot; | |
1443 | srel = htab->elf.srelgot; | |
1444 | for (; local_got < end_local_got; ++local_got, ++local_tls_type) | |
1445 | { | |
1446 | if (*local_got > 0) | |
1447 | { | |
1448 | *local_got = s->size; | |
1449 | s->size += RISCV_ELF_WORD_BYTES; | |
1450 | if (*local_tls_type & GOT_TLS_GD) | |
1451 | s->size += RISCV_ELF_WORD_BYTES; | |
1452 | if (bfd_link_pic (info) | |
1453 | || (*local_tls_type & (GOT_TLS_GD | GOT_TLS_IE))) | |
1454 | srel->size += sizeof (ElfNN_External_Rela); | |
1455 | } | |
1456 | else | |
1457 | *local_got = (bfd_vma) -1; | |
1458 | } | |
1459 | } | |
1460 | ||
02dd9d25 NC |
1461 | /* Allocate .plt and .got entries and space dynamic relocs for |
1462 | global symbols. */ | |
e23eba97 NC |
1463 | elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info); |
1464 | ||
02dd9d25 NC |
1465 | /* Allocate .plt and .got entries and space dynamic relocs for |
1466 | global ifunc symbols. */ | |
1467 | elf_link_hash_traverse (&htab->elf, allocate_ifunc_dynrelocs, info); | |
1468 | ||
1469 | /* Allocate .plt and .got entries and space dynamic relocs for | |
1470 | local ifunc symbols. */ | |
1471 | htab_traverse (htab->loc_hash_table, allocate_local_ifunc_dynrelocs, info); | |
1472 | ||
51a8a7c2 NC |
1473 | /* Used to resolve the dynamic relocs overwite problems when |
1474 | generating static executable. */ | |
1475 | if (htab->elf.irelplt) | |
1476 | htab->last_iplt_index = htab->elf.irelplt->reloc_count - 1; | |
1477 | ||
e23eba97 NC |
1478 | if (htab->elf.sgotplt) |
1479 | { | |
1480 | struct elf_link_hash_entry *got; | |
1481 | got = elf_link_hash_lookup (elf_hash_table (info), | |
1482 | "_GLOBAL_OFFSET_TABLE_", | |
0a1b45a2 | 1483 | false, false, false); |
e23eba97 NC |
1484 | |
1485 | /* Don't allocate .got.plt section if there are no GOT nor PLT | |
1486 | entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */ | |
1487 | if ((got == NULL | |
1488 | || !got->ref_regular_nonweak) | |
1489 | && (htab->elf.sgotplt->size == GOTPLT_HEADER_SIZE) | |
1490 | && (htab->elf.splt == NULL | |
1491 | || htab->elf.splt->size == 0) | |
1492 | && (htab->elf.sgot == NULL | |
1493 | || (htab->elf.sgot->size | |
1494 | == get_elf_backend_data (output_bfd)->got_header_size))) | |
1495 | htab->elf.sgotplt->size = 0; | |
1496 | } | |
1497 | ||
1498 | /* The check_relocs and adjust_dynamic_symbol entry points have | |
1499 | determined the sizes of the various dynamic sections. Allocate | |
1500 | memory for them. */ | |
1501 | for (s = dynobj->sections; s != NULL; s = s->next) | |
1502 | { | |
1503 | if ((s->flags & SEC_LINKER_CREATED) == 0) | |
1504 | continue; | |
1505 | ||
1506 | if (s == htab->elf.splt | |
1507 | || s == htab->elf.sgot | |
1508 | || s == htab->elf.sgotplt | |
02dd9d25 NC |
1509 | || s == htab->elf.iplt |
1510 | || s == htab->elf.igotplt | |
5474d94f | 1511 | || s == htab->elf.sdynbss |
3e1b4df8 JW |
1512 | || s == htab->elf.sdynrelro |
1513 | || s == htab->sdyntdata) | |
e23eba97 NC |
1514 | { |
1515 | /* Strip this section if we don't need it; see the | |
1516 | comment below. */ | |
1517 | } | |
1518 | else if (strncmp (s->name, ".rela", 5) == 0) | |
1519 | { | |
1520 | if (s->size != 0) | |
1521 | { | |
1522 | /* We use the reloc_count field as a counter if we need | |
1523 | to copy relocs into the output file. */ | |
1524 | s->reloc_count = 0; | |
1525 | } | |
1526 | } | |
1527 | else | |
1528 | { | |
1529 | /* It's not one of our sections. */ | |
1530 | continue; | |
1531 | } | |
1532 | ||
1533 | if (s->size == 0) | |
1534 | { | |
1535 | /* If we don't need this section, strip it from the | |
1536 | output file. This is mostly to handle .rela.bss and | |
1537 | .rela.plt. We must create both sections in | |
1538 | create_dynamic_sections, because they must be created | |
1539 | before the linker maps input sections to output | |
1540 | sections. The linker does that before | |
1541 | adjust_dynamic_symbol is called, and it is that | |
1542 | function which decides whether anything needs to go | |
1543 | into these sections. */ | |
1544 | s->flags |= SEC_EXCLUDE; | |
1545 | continue; | |
1546 | } | |
1547 | ||
1548 | if ((s->flags & SEC_HAS_CONTENTS) == 0) | |
1549 | continue; | |
1550 | ||
1551 | /* Allocate memory for the section contents. Zero the memory | |
1552 | for the benefit of .rela.plt, which has 4 unused entries | |
1553 | at the beginning, and we don't want garbage. */ | |
1554 | s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); | |
1555 | if (s->contents == NULL) | |
0a1b45a2 | 1556 | return false; |
e23eba97 NC |
1557 | } |
1558 | ||
0a1b45a2 | 1559 | return _bfd_elf_add_dynamic_tags (output_bfd, info, true); |
e23eba97 NC |
1560 | } |
1561 | ||
1562 | #define TP_OFFSET 0 | |
1563 | #define DTP_OFFSET 0x800 | |
1564 | ||
1565 | /* Return the relocation value for a TLS dtp-relative reloc. */ | |
1566 | ||
1567 | static bfd_vma | |
1568 | dtpoff (struct bfd_link_info *info, bfd_vma address) | |
1569 | { | |
1570 | /* If tls_sec is NULL, we should have signalled an error already. */ | |
1571 | if (elf_hash_table (info)->tls_sec == NULL) | |
1572 | return 0; | |
1573 | return address - elf_hash_table (info)->tls_sec->vma - DTP_OFFSET; | |
1574 | } | |
1575 | ||
1576 | /* Return the relocation value for a static TLS tp-relative relocation. */ | |
1577 | ||
1578 | static bfd_vma | |
1579 | tpoff (struct bfd_link_info *info, bfd_vma address) | |
1580 | { | |
1581 | /* If tls_sec is NULL, we should have signalled an error already. */ | |
1582 | if (elf_hash_table (info)->tls_sec == NULL) | |
1583 | return 0; | |
1584 | return address - elf_hash_table (info)->tls_sec->vma - TP_OFFSET; | |
1585 | } | |
1586 | ||
1587 | /* Return the global pointer's value, or 0 if it is not in use. */ | |
1588 | ||
1589 | static bfd_vma | |
1590 | riscv_global_pointer_value (struct bfd_link_info *info) | |
1591 | { | |
1592 | struct bfd_link_hash_entry *h; | |
1593 | ||
0a1b45a2 | 1594 | h = bfd_link_hash_lookup (info->hash, RISCV_GP_SYMBOL, false, false, true); |
e23eba97 NC |
1595 | if (h == NULL || h->type != bfd_link_hash_defined) |
1596 | return 0; | |
1597 | ||
1598 | return h->u.def.value + sec_addr (h->u.def.section); | |
1599 | } | |
1600 | ||
1601 | /* Emplace a static relocation. */ | |
1602 | ||
1603 | static bfd_reloc_status_type | |
1604 | perform_relocation (const reloc_howto_type *howto, | |
1605 | const Elf_Internal_Rela *rel, | |
1606 | bfd_vma value, | |
1607 | asection *input_section, | |
1608 | bfd *input_bfd, | |
1609 | bfd_byte *contents) | |
1610 | { | |
1611 | if (howto->pc_relative) | |
1612 | value -= sec_addr (input_section) + rel->r_offset; | |
1613 | value += rel->r_addend; | |
1614 | ||
1615 | switch (ELFNN_R_TYPE (rel->r_info)) | |
1616 | { | |
1617 | case R_RISCV_HI20: | |
1618 | case R_RISCV_TPREL_HI20: | |
1619 | case R_RISCV_PCREL_HI20: | |
1620 | case R_RISCV_GOT_HI20: | |
1621 | case R_RISCV_TLS_GOT_HI20: | |
1622 | case R_RISCV_TLS_GD_HI20: | |
1623 | if (ARCH_SIZE > 32 && !VALID_UTYPE_IMM (RISCV_CONST_HIGH_PART (value))) | |
1624 | return bfd_reloc_overflow; | |
1625 | value = ENCODE_UTYPE_IMM (RISCV_CONST_HIGH_PART (value)); | |
1626 | break; | |
1627 | ||
1628 | case R_RISCV_LO12_I: | |
1629 | case R_RISCV_GPREL_I: | |
1630 | case R_RISCV_TPREL_LO12_I: | |
45f76423 | 1631 | case R_RISCV_TPREL_I: |
e23eba97 NC |
1632 | case R_RISCV_PCREL_LO12_I: |
1633 | value = ENCODE_ITYPE_IMM (value); | |
1634 | break; | |
1635 | ||
1636 | case R_RISCV_LO12_S: | |
1637 | case R_RISCV_GPREL_S: | |
1638 | case R_RISCV_TPREL_LO12_S: | |
45f76423 | 1639 | case R_RISCV_TPREL_S: |
e23eba97 NC |
1640 | case R_RISCV_PCREL_LO12_S: |
1641 | value = ENCODE_STYPE_IMM (value); | |
1642 | break; | |
1643 | ||
1644 | case R_RISCV_CALL: | |
1645 | case R_RISCV_CALL_PLT: | |
1646 | if (ARCH_SIZE > 32 && !VALID_UTYPE_IMM (RISCV_CONST_HIGH_PART (value))) | |
1647 | return bfd_reloc_overflow; | |
1648 | value = ENCODE_UTYPE_IMM (RISCV_CONST_HIGH_PART (value)) | |
1649 | | (ENCODE_ITYPE_IMM (value) << 32); | |
1650 | break; | |
1651 | ||
1652 | case R_RISCV_JAL: | |
5a9f5403 | 1653 | if (!VALID_JTYPE_IMM (value)) |
e23eba97 | 1654 | return bfd_reloc_overflow; |
5a9f5403 | 1655 | value = ENCODE_JTYPE_IMM (value); |
e23eba97 NC |
1656 | break; |
1657 | ||
1658 | case R_RISCV_BRANCH: | |
5a9f5403 | 1659 | if (!VALID_BTYPE_IMM (value)) |
e23eba97 | 1660 | return bfd_reloc_overflow; |
5a9f5403 | 1661 | value = ENCODE_BTYPE_IMM (value); |
e23eba97 NC |
1662 | break; |
1663 | ||
1664 | case R_RISCV_RVC_BRANCH: | |
5a9f5403 | 1665 | if (!VALID_CBTYPE_IMM (value)) |
e23eba97 | 1666 | return bfd_reloc_overflow; |
5a9f5403 | 1667 | value = ENCODE_CBTYPE_IMM (value); |
e23eba97 NC |
1668 | break; |
1669 | ||
1670 | case R_RISCV_RVC_JUMP: | |
5a9f5403 | 1671 | if (!VALID_CJTYPE_IMM (value)) |
e23eba97 | 1672 | return bfd_reloc_overflow; |
5a9f5403 | 1673 | value = ENCODE_CJTYPE_IMM (value); |
e23eba97 NC |
1674 | break; |
1675 | ||
1676 | case R_RISCV_RVC_LUI: | |
080a4883 JW |
1677 | if (RISCV_CONST_HIGH_PART (value) == 0) |
1678 | { | |
1679 | /* Linker relaxation can convert an address equal to or greater than | |
1680 | 0x800 to slightly below 0x800. C.LUI does not accept zero as a | |
1681 | valid immediate. We can fix this by converting it to a C.LI. */ | |
fbc09e7a MC |
1682 | bfd_vma insn = riscv_get_insn (howto->bitsize, |
1683 | contents + rel->r_offset); | |
080a4883 | 1684 | insn = (insn & ~MATCH_C_LUI) | MATCH_C_LI; |
fbc09e7a | 1685 | riscv_put_insn (howto->bitsize, insn, contents + rel->r_offset); |
5a9f5403 | 1686 | value = ENCODE_CITYPE_IMM (0); |
080a4883 | 1687 | } |
5a9f5403 | 1688 | else if (!VALID_CITYPE_LUI_IMM (RISCV_CONST_HIGH_PART (value))) |
e23eba97 | 1689 | return bfd_reloc_overflow; |
080a4883 | 1690 | else |
5a9f5403 | 1691 | value = ENCODE_CITYPE_LUI_IMM (RISCV_CONST_HIGH_PART (value)); |
e23eba97 NC |
1692 | break; |
1693 | ||
1694 | case R_RISCV_32: | |
1695 | case R_RISCV_64: | |
1696 | case R_RISCV_ADD8: | |
1697 | case R_RISCV_ADD16: | |
1698 | case R_RISCV_ADD32: | |
1699 | case R_RISCV_ADD64: | |
45f76423 | 1700 | case R_RISCV_SUB6: |
e23eba97 NC |
1701 | case R_RISCV_SUB8: |
1702 | case R_RISCV_SUB16: | |
1703 | case R_RISCV_SUB32: | |
1704 | case R_RISCV_SUB64: | |
45f76423 AW |
1705 | case R_RISCV_SET6: |
1706 | case R_RISCV_SET8: | |
1707 | case R_RISCV_SET16: | |
1708 | case R_RISCV_SET32: | |
a6cbf936 | 1709 | case R_RISCV_32_PCREL: |
e23eba97 NC |
1710 | case R_RISCV_TLS_DTPREL32: |
1711 | case R_RISCV_TLS_DTPREL64: | |
1712 | break; | |
1713 | ||
ff6f4d9b PD |
1714 | case R_RISCV_DELETE: |
1715 | return bfd_reloc_ok; | |
1716 | ||
e23eba97 NC |
1717 | default: |
1718 | return bfd_reloc_notsupported; | |
1719 | } | |
1720 | ||
fbc09e7a MC |
1721 | bfd_vma word; |
1722 | if (riscv_is_insn_reloc (howto)) | |
1723 | word = riscv_get_insn (howto->bitsize, contents + rel->r_offset); | |
1724 | else | |
1725 | word = bfd_get (howto->bitsize, input_bfd, contents + rel->r_offset); | |
e23eba97 | 1726 | word = (word & ~howto->dst_mask) | (value & howto->dst_mask); |
fbc09e7a MC |
1727 | if (riscv_is_insn_reloc (howto)) |
1728 | riscv_put_insn (howto->bitsize, word, contents + rel->r_offset); | |
1729 | else | |
1730 | bfd_put (howto->bitsize, input_bfd, word, contents + rel->r_offset); | |
e23eba97 NC |
1731 | |
1732 | return bfd_reloc_ok; | |
1733 | } | |
1734 | ||
1735 | /* Remember all PC-relative high-part relocs we've encountered to help us | |
1736 | later resolve the corresponding low-part relocs. */ | |
1737 | ||
1738 | typedef struct | |
1739 | { | |
1740 | bfd_vma address; | |
1741 | bfd_vma value; | |
1742 | } riscv_pcrel_hi_reloc; | |
1743 | ||
1744 | typedef struct riscv_pcrel_lo_reloc | |
1745 | { | |
1942a048 NC |
1746 | asection *input_section; |
1747 | struct bfd_link_info *info; | |
1748 | reloc_howto_type *howto; | |
1749 | const Elf_Internal_Rela *reloc; | |
1750 | bfd_vma addr; | |
1751 | const char *name; | |
1752 | bfd_byte *contents; | |
1753 | struct riscv_pcrel_lo_reloc *next; | |
e23eba97 NC |
1754 | } riscv_pcrel_lo_reloc; |
1755 | ||
1756 | typedef struct | |
1757 | { | |
1758 | htab_t hi_relocs; | |
1759 | riscv_pcrel_lo_reloc *lo_relocs; | |
1760 | } riscv_pcrel_relocs; | |
1761 | ||
1762 | static hashval_t | |
1763 | riscv_pcrel_reloc_hash (const void *entry) | |
1764 | { | |
1765 | const riscv_pcrel_hi_reloc *e = entry; | |
1766 | return (hashval_t)(e->address >> 2); | |
1767 | } | |
1768 | ||
1201fda6 | 1769 | static int |
e23eba97 NC |
1770 | riscv_pcrel_reloc_eq (const void *entry1, const void *entry2) |
1771 | { | |
1772 | const riscv_pcrel_hi_reloc *e1 = entry1, *e2 = entry2; | |
1773 | return e1->address == e2->address; | |
1774 | } | |
1775 | ||
0a1b45a2 | 1776 | static bool |
e23eba97 NC |
1777 | riscv_init_pcrel_relocs (riscv_pcrel_relocs *p) |
1778 | { | |
e23eba97 NC |
1779 | p->lo_relocs = NULL; |
1780 | p->hi_relocs = htab_create (1024, riscv_pcrel_reloc_hash, | |
1781 | riscv_pcrel_reloc_eq, free); | |
1782 | return p->hi_relocs != NULL; | |
1783 | } | |
1784 | ||
1785 | static void | |
1786 | riscv_free_pcrel_relocs (riscv_pcrel_relocs *p) | |
1787 | { | |
1788 | riscv_pcrel_lo_reloc *cur = p->lo_relocs; | |
1789 | ||
1790 | while (cur != NULL) | |
1791 | { | |
1792 | riscv_pcrel_lo_reloc *next = cur->next; | |
1793 | free (cur); | |
1794 | cur = next; | |
1795 | } | |
1796 | ||
1797 | htab_delete (p->hi_relocs); | |
1798 | } | |
1799 | ||
0a1b45a2 | 1800 | static bool |
b1308d2c PD |
1801 | riscv_zero_pcrel_hi_reloc (Elf_Internal_Rela *rel, |
1802 | struct bfd_link_info *info, | |
1803 | bfd_vma pc, | |
1804 | bfd_vma addr, | |
1805 | bfd_byte *contents, | |
1806 | const reloc_howto_type *howto, | |
fbc09e7a | 1807 | bfd *input_bfd ATTRIBUTE_UNUSED) |
e23eba97 | 1808 | { |
b1308d2c | 1809 | /* We may need to reference low addreses in PC-relative modes even when the |
dcd709e0 NC |
1810 | PC is far away from these addresses. For example, undefweak references |
1811 | need to produce the address 0 when linked. As 0 is far from the arbitrary | |
1812 | addresses that we can link PC-relative programs at, the linker can't | |
1813 | actually relocate references to those symbols. In order to allow these | |
1814 | programs to work we simply convert the PC-relative auipc sequences to | |
1815 | 0-relative lui sequences. */ | |
b1308d2c | 1816 | if (bfd_link_pic (info)) |
0a1b45a2 | 1817 | return false; |
b1308d2c PD |
1818 | |
1819 | /* If it's possible to reference the symbol using auipc we do so, as that's | |
dcd709e0 | 1820 | more in the spirit of the PC-relative relocations we're processing. */ |
b1308d2c PD |
1821 | bfd_vma offset = addr - pc; |
1822 | if (ARCH_SIZE == 32 || VALID_UTYPE_IMM (RISCV_CONST_HIGH_PART (offset))) | |
0a1b45a2 | 1823 | return false; |
b1308d2c PD |
1824 | |
1825 | /* If it's impossible to reference this with a LUI-based offset then don't | |
dcd709e0 NC |
1826 | bother to convert it at all so users still see the PC-relative relocation |
1827 | in the truncation message. */ | |
b1308d2c | 1828 | if (ARCH_SIZE > 32 && !VALID_UTYPE_IMM (RISCV_CONST_HIGH_PART (addr))) |
0a1b45a2 | 1829 | return false; |
b1308d2c | 1830 | |
1942a048 | 1831 | rel->r_info = ELFNN_R_INFO (addr, R_RISCV_HI20); |
b1308d2c | 1832 | |
1942a048 | 1833 | bfd_vma insn = riscv_get_insn (howto->bitsize, contents + rel->r_offset); |
b1308d2c | 1834 | insn = (insn & ~MASK_AUIPC) | MATCH_LUI; |
1942a048 | 1835 | riscv_put_insn (howto->bitsize, insn, contents + rel->r_offset); |
0a1b45a2 | 1836 | return true; |
b1308d2c PD |
1837 | } |
1838 | ||
0a1b45a2 | 1839 | static bool |
b1308d2c | 1840 | riscv_record_pcrel_hi_reloc (riscv_pcrel_relocs *p, bfd_vma addr, |
0a1b45a2 | 1841 | bfd_vma value, bool absolute) |
b1308d2c PD |
1842 | { |
1843 | bfd_vma offset = absolute ? value : value - addr; | |
1844 | riscv_pcrel_hi_reloc entry = {addr, offset}; | |
e23eba97 NC |
1845 | riscv_pcrel_hi_reloc **slot = |
1846 | (riscv_pcrel_hi_reloc **) htab_find_slot (p->hi_relocs, &entry, INSERT); | |
1847 | ||
1848 | BFD_ASSERT (*slot == NULL); | |
1849 | *slot = (riscv_pcrel_hi_reloc *) bfd_malloc (sizeof (riscv_pcrel_hi_reloc)); | |
1850 | if (*slot == NULL) | |
0a1b45a2 | 1851 | return false; |
e23eba97 | 1852 | **slot = entry; |
0a1b45a2 | 1853 | return true; |
e23eba97 NC |
1854 | } |
1855 | ||
0a1b45a2 | 1856 | static bool |
e23eba97 NC |
1857 | riscv_record_pcrel_lo_reloc (riscv_pcrel_relocs *p, |
1858 | asection *input_section, | |
1859 | struct bfd_link_info *info, | |
1860 | reloc_howto_type *howto, | |
1861 | const Elf_Internal_Rela *reloc, | |
1862 | bfd_vma addr, | |
1863 | const char *name, | |
1864 | bfd_byte *contents) | |
1865 | { | |
1866 | riscv_pcrel_lo_reloc *entry; | |
1867 | entry = (riscv_pcrel_lo_reloc *) bfd_malloc (sizeof (riscv_pcrel_lo_reloc)); | |
1868 | if (entry == NULL) | |
0a1b45a2 | 1869 | return false; |
e23eba97 NC |
1870 | *entry = (riscv_pcrel_lo_reloc) {input_section, info, howto, reloc, addr, |
1871 | name, contents, p->lo_relocs}; | |
1872 | p->lo_relocs = entry; | |
0a1b45a2 | 1873 | return true; |
e23eba97 NC |
1874 | } |
1875 | ||
0a1b45a2 | 1876 | static bool |
e23eba97 NC |
1877 | riscv_resolve_pcrel_lo_relocs (riscv_pcrel_relocs *p) |
1878 | { | |
1879 | riscv_pcrel_lo_reloc *r; | |
1880 | ||
1881 | for (r = p->lo_relocs; r != NULL; r = r->next) | |
1882 | { | |
1883 | bfd *input_bfd = r->input_section->owner; | |
1884 | ||
1885 | riscv_pcrel_hi_reloc search = {r->addr, 0}; | |
1886 | riscv_pcrel_hi_reloc *entry = htab_find (p->hi_relocs, &search); | |
551703cf JW |
1887 | if (entry == NULL |
1888 | /* Check for overflow into bit 11 when adding reloc addend. */ | |
1942a048 | 1889 | || (!(entry->value & 0x800) |
551703cf | 1890 | && ((entry->value + r->reloc->r_addend) & 0x800))) |
07d6d2b8 | 1891 | { |
551703cf JW |
1892 | char *string = (entry == NULL |
1893 | ? "%pcrel_lo missing matching %pcrel_hi" | |
1894 | : "%pcrel_lo overflow with an addend"); | |
1895 | (*r->info->callbacks->reloc_dangerous) | |
1896 | (r->info, string, input_bfd, r->input_section, r->reloc->r_offset); | |
0a1b45a2 | 1897 | return true; |
07d6d2b8 | 1898 | } |
e23eba97 NC |
1899 | |
1900 | perform_relocation (r->howto, r->reloc, entry->value, r->input_section, | |
1901 | input_bfd, r->contents); | |
1902 | } | |
1903 | ||
0a1b45a2 | 1904 | return true; |
e23eba97 NC |
1905 | } |
1906 | ||
1907 | /* Relocate a RISC-V ELF section. | |
1908 | ||
1909 | The RELOCATE_SECTION function is called by the new ELF backend linker | |
1910 | to handle the relocations for a section. | |
1911 | ||
1912 | The relocs are always passed as Rela structures. | |
1913 | ||
1914 | This function is responsible for adjusting the section contents as | |
1915 | necessary, and (if generating a relocatable output file) adjusting | |
1916 | the reloc addend as necessary. | |
1917 | ||
1918 | This function does not have to worry about setting the reloc | |
1919 | address or the reloc symbol index. | |
1920 | ||
1921 | LOCAL_SYMS is a pointer to the swapped in local symbols. | |
1922 | ||
1923 | LOCAL_SECTIONS is an array giving the section in the input file | |
1924 | corresponding to the st_shndx field of each local symbol. | |
1925 | ||
1926 | The global hash table entry for the global symbols can be found | |
1927 | via elf_sym_hashes (input_bfd). | |
1928 | ||
1929 | When generating relocatable output, this function must handle | |
1930 | STB_LOCAL/STT_SECTION symbols specially. The output symbol is | |
1931 | going to be the section symbol corresponding to the output | |
1932 | section, which means that the addend must be adjusted | |
1933 | accordingly. */ | |
1934 | ||
0f684201 | 1935 | static int |
e23eba97 NC |
1936 | riscv_elf_relocate_section (bfd *output_bfd, |
1937 | struct bfd_link_info *info, | |
1938 | bfd *input_bfd, | |
1939 | asection *input_section, | |
1940 | bfd_byte *contents, | |
1941 | Elf_Internal_Rela *relocs, | |
1942 | Elf_Internal_Sym *local_syms, | |
1943 | asection **local_sections) | |
1944 | { | |
1945 | Elf_Internal_Rela *rel; | |
1946 | Elf_Internal_Rela *relend; | |
1947 | riscv_pcrel_relocs pcrel_relocs; | |
0a1b45a2 | 1948 | bool ret = false; |
e23eba97 NC |
1949 | struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info); |
1950 | Elf_Internal_Shdr *symtab_hdr = &elf_symtab_hdr (input_bfd); | |
1951 | struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (input_bfd); | |
1952 | bfd_vma *local_got_offsets = elf_local_got_offsets (input_bfd); | |
0a1b45a2 | 1953 | bool absolute; |
e23eba97 NC |
1954 | |
1955 | if (!riscv_init_pcrel_relocs (&pcrel_relocs)) | |
0a1b45a2 | 1956 | return false; |
e23eba97 NC |
1957 | |
1958 | relend = relocs + input_section->reloc_count; | |
1959 | for (rel = relocs; rel < relend; rel++) | |
1960 | { | |
1961 | unsigned long r_symndx; | |
1962 | struct elf_link_hash_entry *h; | |
1963 | Elf_Internal_Sym *sym; | |
1964 | asection *sec; | |
1965 | bfd_vma relocation; | |
1966 | bfd_reloc_status_type r = bfd_reloc_ok; | |
02dd9d25 | 1967 | const char *name = NULL; |
e23eba97 | 1968 | bfd_vma off, ie_off; |
0a1b45a2 | 1969 | bool unresolved_reloc, is_ie = false; |
e23eba97 NC |
1970 | bfd_vma pc = sec_addr (input_section) + rel->r_offset; |
1971 | int r_type = ELFNN_R_TYPE (rel->r_info), tls_type; | |
0aa13fee | 1972 | reloc_howto_type *howto = riscv_elf_rtype_to_howto (input_bfd, r_type); |
e23eba97 | 1973 | const char *msg = NULL; |
330a6637 | 1974 | char *msg_buf = NULL; |
0a1b45a2 | 1975 | bool resolved_to_zero; |
e23eba97 | 1976 | |
f3185997 NC |
1977 | if (howto == NULL |
1978 | || r_type == R_RISCV_GNU_VTINHERIT || r_type == R_RISCV_GNU_VTENTRY) | |
e23eba97 NC |
1979 | continue; |
1980 | ||
1981 | /* This is a final link. */ | |
1982 | r_symndx = ELFNN_R_SYM (rel->r_info); | |
1983 | h = NULL; | |
1984 | sym = NULL; | |
1985 | sec = NULL; | |
0a1b45a2 | 1986 | unresolved_reloc = false; |
e23eba97 NC |
1987 | if (r_symndx < symtab_hdr->sh_info) |
1988 | { | |
1989 | sym = local_syms + r_symndx; | |
1990 | sec = local_sections[r_symndx]; | |
1991 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); | |
02dd9d25 NC |
1992 | |
1993 | /* Relocate against local STT_GNU_IFUNC symbol. */ | |
1994 | if (!bfd_link_relocatable (info) | |
1995 | && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC) | |
1996 | { | |
0a1b45a2 | 1997 | h = riscv_elf_get_local_sym_hash (htab, input_bfd, rel, false); |
02dd9d25 NC |
1998 | if (h == NULL) |
1999 | abort (); | |
2000 | ||
2001 | /* Set STT_GNU_IFUNC symbol value. */ | |
2002 | h->root.u.def.value = sym->st_value; | |
2003 | h->root.u.def.section = sec; | |
2004 | } | |
e23eba97 NC |
2005 | } |
2006 | else | |
2007 | { | |
0a1b45a2 | 2008 | bool warned, ignored; |
e23eba97 NC |
2009 | |
2010 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, | |
2011 | r_symndx, symtab_hdr, sym_hashes, | |
2012 | h, sec, relocation, | |
2013 | unresolved_reloc, warned, ignored); | |
2014 | if (warned) | |
2015 | { | |
2016 | /* To avoid generating warning messages about truncated | |
2017 | relocations, set the relocation's address to be the same as | |
2018 | the start of this section. */ | |
2019 | if (input_section->output_section != NULL) | |
2020 | relocation = input_section->output_section->vma; | |
2021 | else | |
2022 | relocation = 0; | |
2023 | } | |
2024 | } | |
2025 | ||
2026 | if (sec != NULL && discarded_section (sec)) | |
2027 | RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, | |
2028 | rel, 1, relend, howto, 0, contents); | |
2029 | ||
2030 | if (bfd_link_relocatable (info)) | |
2031 | continue; | |
2032 | ||
02dd9d25 NC |
2033 | /* Since STT_GNU_IFUNC symbol must go through PLT, we handle |
2034 | it here if it is defined in a non-shared object. */ | |
2035 | if (h != NULL | |
2036 | && h->type == STT_GNU_IFUNC | |
2037 | && h->def_regular) | |
2038 | { | |
2039 | asection *plt, *base_got; | |
2040 | ||
2041 | if ((input_section->flags & SEC_ALLOC) == 0) | |
2042 | { | |
2043 | /* If this is a SHT_NOTE section without SHF_ALLOC, treat | |
2044 | STT_GNU_IFUNC symbol as STT_FUNC. */ | |
2045 | if (elf_section_type (input_section) == SHT_NOTE) | |
2046 | goto skip_ifunc; | |
2047 | ||
2048 | /* Dynamic relocs are not propagated for SEC_DEBUGGING | |
2049 | sections because such sections are not SEC_ALLOC and | |
2050 | thus ld.so will not process them. */ | |
2051 | if ((input_section->flags & SEC_DEBUGGING) != 0) | |
2052 | continue; | |
2053 | ||
2054 | abort (); | |
2055 | } | |
2056 | else if (h->plt.offset == (bfd_vma) -1 | |
2057 | /* The following relocation may not need the .plt entries | |
2058 | when all references to a STT_GNU_IFUNC symbols are done | |
2059 | via GOT or static function pointers. */ | |
2060 | && r_type != R_RISCV_32 | |
2061 | && r_type != R_RISCV_64 | |
2062 | && r_type != R_RISCV_HI20 | |
2063 | && r_type != R_RISCV_GOT_HI20 | |
2064 | && r_type != R_RISCV_LO12_I | |
2065 | && r_type != R_RISCV_LO12_S) | |
2066 | goto bad_ifunc_reloc; | |
2067 | ||
2068 | /* STT_GNU_IFUNC symbol must go through PLT. */ | |
2069 | plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt; | |
2070 | relocation = plt->output_section->vma | |
2071 | + plt->output_offset | |
2072 | + h->plt.offset; | |
2073 | ||
2074 | switch (r_type) | |
2075 | { | |
2076 | case R_RISCV_32: | |
2077 | case R_RISCV_64: | |
2078 | if (rel->r_addend != 0) | |
2079 | { | |
2080 | if (h->root.root.string) | |
2081 | name = h->root.root.string; | |
2082 | else | |
2083 | name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym, NULL); | |
2084 | ||
2085 | _bfd_error_handler | |
2086 | /* xgettext:c-format */ | |
2087 | (_("%pB: relocation %s against STT_GNU_IFUNC " | |
2088 | "symbol `%s' has non-zero addend: %" PRId64), | |
2089 | input_bfd, howto->name, name, (int64_t) rel->r_addend); | |
2090 | bfd_set_error (bfd_error_bad_value); | |
0a1b45a2 | 2091 | return false; |
02dd9d25 NC |
2092 | } |
2093 | ||
2094 | /* Generate dynamic relocation only when there is a non-GOT | |
2095 | reference in a shared object or there is no PLT. */ | |
2096 | if ((bfd_link_pic (info) && h->non_got_ref) | |
2097 | || h->plt.offset == (bfd_vma) -1) | |
2098 | { | |
2099 | Elf_Internal_Rela outrel; | |
2100 | asection *sreloc; | |
2101 | ||
2102 | /* Need a dynamic relocation to get the real function | |
2103 | address. */ | |
2104 | outrel.r_offset = _bfd_elf_section_offset (output_bfd, | |
2105 | info, | |
2106 | input_section, | |
2107 | rel->r_offset); | |
2108 | if (outrel.r_offset == (bfd_vma) -1 | |
2109 | || outrel.r_offset == (bfd_vma) -2) | |
2110 | abort (); | |
2111 | ||
2112 | outrel.r_offset += input_section->output_section->vma | |
2113 | + input_section->output_offset; | |
2114 | ||
2115 | if (h->dynindx == -1 | |
2116 | || h->forced_local | |
2117 | || bfd_link_executable (info)) | |
2118 | { | |
2119 | info->callbacks->minfo | |
2120 | (_("Local IFUNC function `%s' in %pB\n"), | |
2121 | h->root.root.string, | |
2122 | h->root.u.def.section->owner); | |
2123 | ||
2124 | /* This symbol is resolved locally. */ | |
2125 | outrel.r_info = ELFNN_R_INFO (0, R_RISCV_IRELATIVE); | |
2126 | outrel.r_addend = h->root.u.def.value | |
2127 | + h->root.u.def.section->output_section->vma | |
2128 | + h->root.u.def.section->output_offset; | |
2129 | } | |
2130 | else | |
2131 | { | |
2132 | outrel.r_info = ELFNN_R_INFO (h->dynindx, r_type); | |
2133 | outrel.r_addend = 0; | |
2134 | } | |
2135 | ||
2136 | /* Dynamic relocations are stored in | |
2137 | 1. .rela.ifunc section in PIC object. | |
2138 | 2. .rela.got section in dynamic executable. | |
2139 | 3. .rela.iplt section in static executable. */ | |
2140 | if (bfd_link_pic (info)) | |
2141 | sreloc = htab->elf.irelifunc; | |
2142 | else if (htab->elf.splt != NULL) | |
2143 | sreloc = htab->elf.srelgot; | |
2144 | else | |
2145 | sreloc = htab->elf.irelplt; | |
2146 | ||
2147 | riscv_elf_append_rela (output_bfd, sreloc, &outrel); | |
2148 | ||
2149 | /* If this reloc is against an external symbol, we | |
2150 | do not want to fiddle with the addend. Otherwise, | |
2151 | we need to include the symbol value so that it | |
2152 | becomes an addend for the dynamic reloc. For an | |
2153 | internal symbol, we have updated addend. */ | |
2154 | continue; | |
2155 | } | |
2156 | goto do_relocation; | |
2157 | ||
2158 | case R_RISCV_GOT_HI20: | |
2159 | base_got = htab->elf.sgot; | |
2160 | off = h->got.offset; | |
2161 | ||
2162 | if (base_got == NULL) | |
2163 | abort (); | |
2164 | ||
2165 | if (off == (bfd_vma) -1) | |
2166 | { | |
2167 | bfd_vma plt_idx; | |
2168 | ||
2169 | /* We can't use h->got.offset here to save state, or | |
2170 | even just remember the offset, as finish_dynamic_symbol | |
2171 | would use that as offset into .got. */ | |
2172 | ||
2173 | if (htab->elf.splt != NULL) | |
2174 | { | |
2175 | plt_idx = (h->plt.offset - PLT_HEADER_SIZE) | |
2176 | / PLT_ENTRY_SIZE; | |
2177 | off = GOTPLT_HEADER_SIZE + (plt_idx * GOT_ENTRY_SIZE); | |
2178 | base_got = htab->elf.sgotplt; | |
2179 | } | |
2180 | else | |
2181 | { | |
2182 | plt_idx = h->plt.offset / PLT_ENTRY_SIZE; | |
2183 | off = plt_idx * GOT_ENTRY_SIZE; | |
2184 | base_got = htab->elf.igotplt; | |
2185 | } | |
2186 | ||
2187 | if (h->dynindx == -1 | |
2188 | || h->forced_local | |
2189 | || info->symbolic) | |
2190 | { | |
2191 | /* This references the local definition. We must | |
2192 | initialize this entry in the global offset table. | |
2193 | Since the offset must always be a multiple of 8, | |
2194 | we use the least significant bit to record | |
2195 | whether we have initialized it already. | |
2196 | ||
2197 | When doing a dynamic link, we create a .rela.got | |
2198 | relocation entry to initialize the value. This | |
2199 | is done in the finish_dynamic_symbol routine. */ | |
2200 | if ((off & 1) != 0) | |
2201 | off &= ~1; | |
2202 | else | |
2203 | { | |
2204 | bfd_put_NN (output_bfd, relocation, | |
2205 | base_got->contents + off); | |
2206 | /* Note that this is harmless for the case, | |
2207 | as -1 | 1 still is -1. */ | |
2208 | h->got.offset |= 1; | |
2209 | } | |
2210 | } | |
2211 | } | |
2212 | ||
2213 | relocation = base_got->output_section->vma | |
2214 | + base_got->output_offset + off; | |
2215 | ||
2216 | r_type = ELFNN_R_TYPE (rel->r_info); | |
2217 | howto = riscv_elf_rtype_to_howto (input_bfd, r_type); | |
2218 | if (howto == NULL) | |
2219 | r = bfd_reloc_notsupported; | |
2220 | else if (!riscv_record_pcrel_hi_reloc (&pcrel_relocs, pc, | |
0a1b45a2 | 2221 | relocation, false)) |
02dd9d25 NC |
2222 | r = bfd_reloc_overflow; |
2223 | goto do_relocation; | |
2224 | ||
2225 | case R_RISCV_CALL: | |
2226 | case R_RISCV_CALL_PLT: | |
2227 | case R_RISCV_HI20: | |
2228 | case R_RISCV_LO12_I: | |
2229 | case R_RISCV_LO12_S: | |
2230 | goto do_relocation; | |
2231 | ||
2232 | case R_RISCV_PCREL_HI20: | |
2233 | r_type = ELFNN_R_TYPE (rel->r_info); | |
2234 | howto = riscv_elf_rtype_to_howto (input_bfd, r_type); | |
2235 | if (howto == NULL) | |
2236 | r = bfd_reloc_notsupported; | |
2237 | else if (!riscv_record_pcrel_hi_reloc (&pcrel_relocs, pc, | |
0a1b45a2 | 2238 | relocation, false)) |
02dd9d25 NC |
2239 | r = bfd_reloc_overflow; |
2240 | goto do_relocation; | |
2241 | ||
2242 | default: | |
1942a048 | 2243 | bad_ifunc_reloc: |
02dd9d25 NC |
2244 | if (h->root.root.string) |
2245 | name = h->root.root.string; | |
2246 | else | |
2247 | /* The entry of local ifunc is fake in global hash table, | |
2248 | we should find the name by the original local symbol. */ | |
2249 | name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym, NULL); | |
2250 | ||
2251 | _bfd_error_handler | |
2252 | /* xgettext:c-format */ | |
2253 | (_("%pB: relocation %s against STT_GNU_IFUNC " | |
2254 | "symbol `%s' isn't supported"), input_bfd, | |
2255 | howto->name, name); | |
2256 | bfd_set_error (bfd_error_bad_value); | |
0a1b45a2 | 2257 | return false; |
02dd9d25 NC |
2258 | } |
2259 | } | |
2260 | ||
1942a048 | 2261 | skip_ifunc: |
e23eba97 NC |
2262 | if (h != NULL) |
2263 | name = h->root.root.string; | |
2264 | else | |
2265 | { | |
2266 | name = (bfd_elf_string_from_elf_section | |
2267 | (input_bfd, symtab_hdr->sh_link, sym->st_name)); | |
2268 | if (name == NULL || *name == '\0') | |
fd361982 | 2269 | name = bfd_section_name (sec); |
e23eba97 NC |
2270 | } |
2271 | ||
6487709f JW |
2272 | resolved_to_zero = (h != NULL |
2273 | && UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)); | |
2274 | ||
e23eba97 NC |
2275 | switch (r_type) |
2276 | { | |
2277 | case R_RISCV_NONE: | |
45f76423 | 2278 | case R_RISCV_RELAX: |
e23eba97 NC |
2279 | case R_RISCV_TPREL_ADD: |
2280 | case R_RISCV_COPY: | |
2281 | case R_RISCV_JUMP_SLOT: | |
2282 | case R_RISCV_RELATIVE: | |
2283 | /* These require nothing of us at all. */ | |
2284 | continue; | |
2285 | ||
2286 | case R_RISCV_HI20: | |
2287 | case R_RISCV_BRANCH: | |
2288 | case R_RISCV_RVC_BRANCH: | |
2289 | case R_RISCV_RVC_LUI: | |
2290 | case R_RISCV_LO12_I: | |
2291 | case R_RISCV_LO12_S: | |
45f76423 AW |
2292 | case R_RISCV_SET6: |
2293 | case R_RISCV_SET8: | |
2294 | case R_RISCV_SET16: | |
2295 | case R_RISCV_SET32: | |
a6cbf936 | 2296 | case R_RISCV_32_PCREL: |
ff6f4d9b | 2297 | case R_RISCV_DELETE: |
e23eba97 NC |
2298 | /* These require no special handling beyond perform_relocation. */ |
2299 | break; | |
2300 | ||
2301 | case R_RISCV_GOT_HI20: | |
2302 | if (h != NULL) | |
2303 | { | |
0a1b45a2 | 2304 | bool dyn, pic; |
e23eba97 NC |
2305 | |
2306 | off = h->got.offset; | |
2307 | BFD_ASSERT (off != (bfd_vma) -1); | |
2308 | dyn = elf_hash_table (info)->dynamic_sections_created; | |
2309 | pic = bfd_link_pic (info); | |
2310 | ||
2311 | if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, pic, h) | |
2312 | || (pic && SYMBOL_REFERENCES_LOCAL (info, h))) | |
2313 | { | |
2314 | /* This is actually a static link, or it is a | |
2315 | -Bsymbolic link and the symbol is defined | |
2316 | locally, or the symbol was forced to be local | |
2317 | because of a version file. We must initialize | |
2318 | this entry in the global offset table. Since the | |
2319 | offset must always be a multiple of the word size, | |
2320 | we use the least significant bit to record whether | |
2321 | we have initialized it already. | |
2322 | ||
2323 | When doing a dynamic link, we create a .rela.got | |
2324 | relocation entry to initialize the value. This | |
2325 | is done in the finish_dynamic_symbol routine. */ | |
2326 | if ((off & 1) != 0) | |
2327 | off &= ~1; | |
2328 | else | |
2329 | { | |
2330 | bfd_put_NN (output_bfd, relocation, | |
2331 | htab->elf.sgot->contents + off); | |
2332 | h->got.offset |= 1; | |
2333 | } | |
2334 | } | |
2335 | else | |
0a1b45a2 | 2336 | unresolved_reloc = false; |
e23eba97 NC |
2337 | } |
2338 | else | |
2339 | { | |
2340 | BFD_ASSERT (local_got_offsets != NULL | |
2341 | && local_got_offsets[r_symndx] != (bfd_vma) -1); | |
2342 | ||
2343 | off = local_got_offsets[r_symndx]; | |
2344 | ||
2345 | /* The offset must always be a multiple of the word size. | |
2346 | So, we can use the least significant bit to record | |
2347 | whether we have already processed this entry. */ | |
2348 | if ((off & 1) != 0) | |
2349 | off &= ~1; | |
2350 | else | |
2351 | { | |
2352 | if (bfd_link_pic (info)) | |
2353 | { | |
2354 | asection *s; | |
2355 | Elf_Internal_Rela outrel; | |
2356 | ||
2357 | /* We need to generate a R_RISCV_RELATIVE reloc | |
2358 | for the dynamic linker. */ | |
2359 | s = htab->elf.srelgot; | |
2360 | BFD_ASSERT (s != NULL); | |
2361 | ||
2362 | outrel.r_offset = sec_addr (htab->elf.sgot) + off; | |
2363 | outrel.r_info = | |
2364 | ELFNN_R_INFO (0, R_RISCV_RELATIVE); | |
2365 | outrel.r_addend = relocation; | |
2366 | relocation = 0; | |
2367 | riscv_elf_append_rela (output_bfd, s, &outrel); | |
2368 | } | |
2369 | ||
2370 | bfd_put_NN (output_bfd, relocation, | |
2371 | htab->elf.sgot->contents + off); | |
2372 | local_got_offsets[r_symndx] |= 1; | |
2373 | } | |
2374 | } | |
2375 | relocation = sec_addr (htab->elf.sgot) + off; | |
b1308d2c PD |
2376 | absolute = riscv_zero_pcrel_hi_reloc (rel, |
2377 | info, | |
2378 | pc, | |
2379 | relocation, | |
2380 | contents, | |
2381 | howto, | |
2382 | input_bfd); | |
2383 | r_type = ELFNN_R_TYPE (rel->r_info); | |
0aa13fee | 2384 | howto = riscv_elf_rtype_to_howto (input_bfd, r_type); |
f3185997 NC |
2385 | if (howto == NULL) |
2386 | r = bfd_reloc_notsupported; | |
2387 | else if (!riscv_record_pcrel_hi_reloc (&pcrel_relocs, pc, | |
2388 | relocation, absolute)) | |
e23eba97 NC |
2389 | r = bfd_reloc_overflow; |
2390 | break; | |
2391 | ||
2392 | case R_RISCV_ADD8: | |
2393 | case R_RISCV_ADD16: | |
2394 | case R_RISCV_ADD32: | |
2395 | case R_RISCV_ADD64: | |
2396 | { | |
2397 | bfd_vma old_value = bfd_get (howto->bitsize, input_bfd, | |
2398 | contents + rel->r_offset); | |
2399 | relocation = old_value + relocation; | |
2400 | } | |
2401 | break; | |
2402 | ||
45f76423 | 2403 | case R_RISCV_SUB6: |
e23eba97 NC |
2404 | case R_RISCV_SUB8: |
2405 | case R_RISCV_SUB16: | |
2406 | case R_RISCV_SUB32: | |
2407 | case R_RISCV_SUB64: | |
2408 | { | |
2409 | bfd_vma old_value = bfd_get (howto->bitsize, input_bfd, | |
2410 | contents + rel->r_offset); | |
2411 | relocation = old_value - relocation; | |
2412 | } | |
2413 | break; | |
2414 | ||
e23eba97 | 2415 | case R_RISCV_CALL: |
85f78364 | 2416 | case R_RISCV_CALL_PLT: |
cf7a5066 JW |
2417 | /* Handle a call to an undefined weak function. This won't be |
2418 | relaxed, so we have to handle it here. */ | |
2419 | if (h != NULL && h->root.type == bfd_link_hash_undefweak | |
85f78364 | 2420 | && (!bfd_link_pic (info) || h->plt.offset == MINUS_ONE)) |
cf7a5066 JW |
2421 | { |
2422 | /* We can use x0 as the base register. */ | |
fbc09e7a | 2423 | bfd_vma insn = bfd_getl32 (contents + rel->r_offset + 4); |
cf7a5066 | 2424 | insn &= ~(OP_MASK_RS1 << OP_SH_RS1); |
fbc09e7a | 2425 | bfd_putl32 (insn, contents + rel->r_offset + 4); |
cf7a5066 JW |
2426 | /* Set the relocation value so that we get 0 after the pc |
2427 | relative adjustment. */ | |
2428 | relocation = sec_addr (input_section) + rel->r_offset; | |
2429 | } | |
2430 | /* Fall through. */ | |
2431 | ||
e23eba97 NC |
2432 | case R_RISCV_JAL: |
2433 | case R_RISCV_RVC_JUMP: | |
85f78364 | 2434 | /* This line has to match the check in _bfd_riscv_relax_section. */ |
e23eba97 NC |
2435 | if (bfd_link_pic (info) && h != NULL && h->plt.offset != MINUS_ONE) |
2436 | { | |
2437 | /* Refer to the PLT entry. */ | |
2438 | relocation = sec_addr (htab->elf.splt) + h->plt.offset; | |
0a1b45a2 | 2439 | unresolved_reloc = false; |
e23eba97 NC |
2440 | } |
2441 | break; | |
2442 | ||
2443 | case R_RISCV_TPREL_HI20: | |
2444 | relocation = tpoff (info, relocation); | |
2445 | break; | |
2446 | ||
2447 | case R_RISCV_TPREL_LO12_I: | |
2448 | case R_RISCV_TPREL_LO12_S: | |
45f76423 AW |
2449 | relocation = tpoff (info, relocation); |
2450 | break; | |
2451 | ||
2452 | case R_RISCV_TPREL_I: | |
2453 | case R_RISCV_TPREL_S: | |
e23eba97 NC |
2454 | relocation = tpoff (info, relocation); |
2455 | if (VALID_ITYPE_IMM (relocation + rel->r_addend)) | |
2456 | { | |
2457 | /* We can use tp as the base register. */ | |
fbc09e7a | 2458 | bfd_vma insn = bfd_getl32 (contents + rel->r_offset); |
e23eba97 NC |
2459 | insn &= ~(OP_MASK_RS1 << OP_SH_RS1); |
2460 | insn |= X_TP << OP_SH_RS1; | |
fbc09e7a | 2461 | bfd_putl32 (insn, contents + rel->r_offset); |
e23eba97 | 2462 | } |
45f76423 AW |
2463 | else |
2464 | r = bfd_reloc_overflow; | |
e23eba97 NC |
2465 | break; |
2466 | ||
2467 | case R_RISCV_GPREL_I: | |
2468 | case R_RISCV_GPREL_S: | |
2469 | { | |
2470 | bfd_vma gp = riscv_global_pointer_value (info); | |
0a1b45a2 | 2471 | bool x0_base = VALID_ITYPE_IMM (relocation + rel->r_addend); |
e23eba97 NC |
2472 | if (x0_base || VALID_ITYPE_IMM (relocation + rel->r_addend - gp)) |
2473 | { | |
2474 | /* We can use x0 or gp as the base register. */ | |
fbc09e7a | 2475 | bfd_vma insn = bfd_getl32 (contents + rel->r_offset); |
e23eba97 NC |
2476 | insn &= ~(OP_MASK_RS1 << OP_SH_RS1); |
2477 | if (!x0_base) | |
2478 | { | |
2479 | rel->r_addend -= gp; | |
2480 | insn |= X_GP << OP_SH_RS1; | |
2481 | } | |
fbc09e7a | 2482 | bfd_putl32 (insn, contents + rel->r_offset); |
e23eba97 NC |
2483 | } |
2484 | else | |
2485 | r = bfd_reloc_overflow; | |
2486 | break; | |
2487 | } | |
2488 | ||
2489 | case R_RISCV_PCREL_HI20: | |
b1308d2c PD |
2490 | absolute = riscv_zero_pcrel_hi_reloc (rel, |
2491 | info, | |
2492 | pc, | |
2493 | relocation, | |
2494 | contents, | |
2495 | howto, | |
2496 | input_bfd); | |
2497 | r_type = ELFNN_R_TYPE (rel->r_info); | |
0aa13fee | 2498 | howto = riscv_elf_rtype_to_howto (input_bfd, r_type); |
f3185997 NC |
2499 | if (howto == NULL) |
2500 | r = bfd_reloc_notsupported; | |
2501 | else if (!riscv_record_pcrel_hi_reloc (&pcrel_relocs, pc, | |
2502 | relocation + rel->r_addend, | |
2503 | absolute)) | |
e23eba97 NC |
2504 | r = bfd_reloc_overflow; |
2505 | break; | |
2506 | ||
2507 | case R_RISCV_PCREL_LO12_I: | |
2508 | case R_RISCV_PCREL_LO12_S: | |
551703cf JW |
2509 | /* We don't allow section symbols plus addends as the auipc address, |
2510 | because then riscv_relax_delete_bytes would have to search through | |
2511 | all relocs to update these addends. This is also ambiguous, as | |
2512 | we do allow offsets to be added to the target address, which are | |
2513 | not to be used to find the auipc address. */ | |
a9f5a551 JW |
2514 | if (((sym != NULL && (ELF_ST_TYPE (sym->st_info) == STT_SECTION)) |
2515 | || (h != NULL && h->type == STT_SECTION)) | |
2516 | && rel->r_addend) | |
2a0d9853 | 2517 | { |
330a6637 | 2518 | msg = _("%pcrel_lo section symbol with an addend"); |
2a0d9853 JW |
2519 | r = bfd_reloc_dangerous; |
2520 | break; | |
2521 | } | |
2522 | ||
e23eba97 NC |
2523 | if (riscv_record_pcrel_lo_reloc (&pcrel_relocs, input_section, info, |
2524 | howto, rel, relocation, name, | |
2525 | contents)) | |
2526 | continue; | |
2527 | r = bfd_reloc_overflow; | |
2528 | break; | |
2529 | ||
2530 | case R_RISCV_TLS_DTPREL32: | |
2531 | case R_RISCV_TLS_DTPREL64: | |
2532 | relocation = dtpoff (info, relocation); | |
2533 | break; | |
2534 | ||
2535 | case R_RISCV_32: | |
2536 | case R_RISCV_64: | |
2537 | if ((input_section->flags & SEC_ALLOC) == 0) | |
2538 | break; | |
2539 | ||
2540 | if ((bfd_link_pic (info) | |
2541 | && (h == NULL | |
6487709f JW |
2542 | || (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
2543 | && !resolved_to_zero) | |
e23eba97 | 2544 | || h->root.type != bfd_link_hash_undefweak) |
1942a048 | 2545 | && (!howto->pc_relative |
e23eba97 NC |
2546 | || !SYMBOL_CALLS_LOCAL (info, h))) |
2547 | || (!bfd_link_pic (info) | |
2548 | && h != NULL | |
2549 | && h->dynindx != -1 | |
2550 | && !h->non_got_ref | |
2551 | && ((h->def_dynamic | |
2552 | && !h->def_regular) | |
2553 | || h->root.type == bfd_link_hash_undefweak | |
2554 | || h->root.type == bfd_link_hash_undefined))) | |
2555 | { | |
2556 | Elf_Internal_Rela outrel; | |
02dd9d25 | 2557 | asection *sreloc; |
0a1b45a2 | 2558 | bool skip_static_relocation, skip_dynamic_relocation; |
e23eba97 NC |
2559 | |
2560 | /* When generating a shared object, these relocations | |
2561 | are copied into the output file to be resolved at run | |
2562 | time. */ | |
2563 | ||
2564 | outrel.r_offset = | |
2565 | _bfd_elf_section_offset (output_bfd, info, input_section, | |
2566 | rel->r_offset); | |
2567 | skip_static_relocation = outrel.r_offset != (bfd_vma) -2; | |
2568 | skip_dynamic_relocation = outrel.r_offset >= (bfd_vma) -2; | |
2569 | outrel.r_offset += sec_addr (input_section); | |
2570 | ||
2571 | if (skip_dynamic_relocation) | |
2572 | memset (&outrel, 0, sizeof outrel); | |
2573 | else if (h != NULL && h->dynindx != -1 | |
2574 | && !(bfd_link_pic (info) | |
2575 | && SYMBOLIC_BIND (info, h) | |
2576 | && h->def_regular)) | |
2577 | { | |
2578 | outrel.r_info = ELFNN_R_INFO (h->dynindx, r_type); | |
2579 | outrel.r_addend = rel->r_addend; | |
2580 | } | |
2581 | else | |
2582 | { | |
2583 | outrel.r_info = ELFNN_R_INFO (0, R_RISCV_RELATIVE); | |
2584 | outrel.r_addend = relocation + rel->r_addend; | |
2585 | } | |
2586 | ||
02dd9d25 | 2587 | sreloc = elf_section_data (input_section)->sreloc; |
e23eba97 NC |
2588 | riscv_elf_append_rela (output_bfd, sreloc, &outrel); |
2589 | if (skip_static_relocation) | |
2590 | continue; | |
2591 | } | |
2592 | break; | |
2593 | ||
2594 | case R_RISCV_TLS_GOT_HI20: | |
0a1b45a2 | 2595 | is_ie = true; |
e23eba97 NC |
2596 | /* Fall through. */ |
2597 | ||
2598 | case R_RISCV_TLS_GD_HI20: | |
2599 | if (h != NULL) | |
2600 | { | |
2601 | off = h->got.offset; | |
2602 | h->got.offset |= 1; | |
2603 | } | |
2604 | else | |
2605 | { | |
2606 | off = local_got_offsets[r_symndx]; | |
2607 | local_got_offsets[r_symndx] |= 1; | |
2608 | } | |
2609 | ||
2610 | tls_type = _bfd_riscv_elf_tls_type (input_bfd, h, r_symndx); | |
2611 | BFD_ASSERT (tls_type & (GOT_TLS_IE | GOT_TLS_GD)); | |
2612 | /* If this symbol is referenced by both GD and IE TLS, the IE | |
2613 | reference's GOT slot follows the GD reference's slots. */ | |
2614 | ie_off = 0; | |
2615 | if ((tls_type & GOT_TLS_GD) && (tls_type & GOT_TLS_IE)) | |
2616 | ie_off = 2 * GOT_ENTRY_SIZE; | |
2617 | ||
2618 | if ((off & 1) != 0) | |
2619 | off &= ~1; | |
2620 | else | |
2621 | { | |
2622 | Elf_Internal_Rela outrel; | |
2623 | int indx = 0; | |
0a1b45a2 | 2624 | bool need_relocs = false; |
e23eba97 NC |
2625 | |
2626 | if (htab->elf.srelgot == NULL) | |
2627 | abort (); | |
2628 | ||
2629 | if (h != NULL) | |
2630 | { | |
0a1b45a2 | 2631 | bool dyn, pic; |
e23eba97 NC |
2632 | dyn = htab->elf.dynamic_sections_created; |
2633 | pic = bfd_link_pic (info); | |
2634 | ||
2635 | if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, pic, h) | |
2636 | && (!pic || !SYMBOL_REFERENCES_LOCAL (info, h))) | |
2637 | indx = h->dynindx; | |
2638 | } | |
2639 | ||
2640 | /* The GOT entries have not been initialized yet. Do it | |
07d6d2b8 | 2641 | now, and emit any relocations. */ |
e23eba97 NC |
2642 | if ((bfd_link_pic (info) || indx != 0) |
2643 | && (h == NULL | |
2644 | || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT | |
2645 | || h->root.type != bfd_link_hash_undefweak)) | |
0a1b45a2 | 2646 | need_relocs = true; |
e23eba97 NC |
2647 | |
2648 | if (tls_type & GOT_TLS_GD) | |
2649 | { | |
2650 | if (need_relocs) | |
2651 | { | |
2652 | outrel.r_offset = sec_addr (htab->elf.sgot) + off; | |
2653 | outrel.r_addend = 0; | |
2654 | outrel.r_info = ELFNN_R_INFO (indx, R_RISCV_TLS_DTPMODNN); | |
2655 | bfd_put_NN (output_bfd, 0, | |
2656 | htab->elf.sgot->contents + off); | |
2657 | riscv_elf_append_rela (output_bfd, htab->elf.srelgot, &outrel); | |
2658 | if (indx == 0) | |
2659 | { | |
2660 | BFD_ASSERT (! unresolved_reloc); | |
2661 | bfd_put_NN (output_bfd, | |
2662 | dtpoff (info, relocation), | |
1942a048 NC |
2663 | (htab->elf.sgot->contents |
2664 | + off + RISCV_ELF_WORD_BYTES)); | |
e23eba97 NC |
2665 | } |
2666 | else | |
2667 | { | |
2668 | bfd_put_NN (output_bfd, 0, | |
1942a048 NC |
2669 | (htab->elf.sgot->contents |
2670 | + off + RISCV_ELF_WORD_BYTES)); | |
e23eba97 NC |
2671 | outrel.r_info = ELFNN_R_INFO (indx, R_RISCV_TLS_DTPRELNN); |
2672 | outrel.r_offset += RISCV_ELF_WORD_BYTES; | |
2673 | riscv_elf_append_rela (output_bfd, htab->elf.srelgot, &outrel); | |
2674 | } | |
2675 | } | |
2676 | else | |
2677 | { | |
2678 | /* If we are not emitting relocations for a | |
2679 | general dynamic reference, then we must be in a | |
2680 | static link or an executable link with the | |
2681 | symbol binding locally. Mark it as belonging | |
2682 | to module 1, the executable. */ | |
2683 | bfd_put_NN (output_bfd, 1, | |
2684 | htab->elf.sgot->contents + off); | |
2685 | bfd_put_NN (output_bfd, | |
2686 | dtpoff (info, relocation), | |
1942a048 NC |
2687 | (htab->elf.sgot->contents |
2688 | + off + RISCV_ELF_WORD_BYTES)); | |
e23eba97 NC |
2689 | } |
2690 | } | |
2691 | ||
2692 | if (tls_type & GOT_TLS_IE) | |
2693 | { | |
2694 | if (need_relocs) | |
2695 | { | |
2696 | bfd_put_NN (output_bfd, 0, | |
2697 | htab->elf.sgot->contents + off + ie_off); | |
2698 | outrel.r_offset = sec_addr (htab->elf.sgot) | |
1942a048 | 2699 | + off + ie_off; |
e23eba97 NC |
2700 | outrel.r_addend = 0; |
2701 | if (indx == 0) | |
2702 | outrel.r_addend = tpoff (info, relocation); | |
2703 | outrel.r_info = ELFNN_R_INFO (indx, R_RISCV_TLS_TPRELNN); | |
2704 | riscv_elf_append_rela (output_bfd, htab->elf.srelgot, &outrel); | |
2705 | } | |
2706 | else | |
2707 | { | |
2708 | bfd_put_NN (output_bfd, tpoff (info, relocation), | |
2709 | htab->elf.sgot->contents + off + ie_off); | |
2710 | } | |
2711 | } | |
2712 | } | |
2713 | ||
2714 | BFD_ASSERT (off < (bfd_vma) -2); | |
2715 | relocation = sec_addr (htab->elf.sgot) + off + (is_ie ? ie_off : 0); | |
b1308d2c | 2716 | if (!riscv_record_pcrel_hi_reloc (&pcrel_relocs, pc, |
0a1b45a2 | 2717 | relocation, false)) |
e23eba97 | 2718 | r = bfd_reloc_overflow; |
0a1b45a2 | 2719 | unresolved_reloc = false; |
e23eba97 NC |
2720 | break; |
2721 | ||
2722 | default: | |
2723 | r = bfd_reloc_notsupported; | |
2724 | } | |
2725 | ||
2726 | /* Dynamic relocs are not propagated for SEC_DEBUGGING sections | |
2727 | because such sections are not SEC_ALLOC and thus ld.so will | |
2728 | not process them. */ | |
2729 | if (unresolved_reloc | |
2730 | && !((input_section->flags & SEC_DEBUGGING) != 0 | |
2731 | && h->def_dynamic) | |
2732 | && _bfd_elf_section_offset (output_bfd, info, input_section, | |
2733 | rel->r_offset) != (bfd_vma) -1) | |
2734 | { | |
330a6637 JW |
2735 | switch (r_type) |
2736 | { | |
330a6637 JW |
2737 | case R_RISCV_JAL: |
2738 | case R_RISCV_RVC_JUMP: | |
2739 | if (asprintf (&msg_buf, | |
2740 | _("%%X%%P: relocation %s against `%s' can " | |
2741 | "not be used when making a shared object; " | |
2742 | "recompile with -fPIC\n"), | |
2743 | howto->name, | |
2744 | h->root.root.string) == -1) | |
2745 | msg_buf = NULL; | |
2746 | break; | |
2747 | ||
2748 | default: | |
2749 | if (asprintf (&msg_buf, | |
2750 | _("%%X%%P: unresolvable %s relocation against " | |
2751 | "symbol `%s'\n"), | |
2752 | howto->name, | |
2753 | h->root.root.string) == -1) | |
2754 | msg_buf = NULL; | |
2755 | break; | |
2756 | } | |
2757 | ||
2758 | msg = msg_buf; | |
2759 | r = bfd_reloc_notsupported; | |
e23eba97 NC |
2760 | } |
2761 | ||
02dd9d25 | 2762 | do_relocation: |
e23eba97 NC |
2763 | if (r == bfd_reloc_ok) |
2764 | r = perform_relocation (howto, rel, relocation, input_section, | |
2765 | input_bfd, contents); | |
2766 | ||
330a6637 JW |
2767 | /* We should have already detected the error and set message before. |
2768 | If the error message isn't set since the linker runs out of memory | |
2769 | or we don't set it before, then we should set the default message | |
2770 | with the "internal error" string here. */ | |
e23eba97 NC |
2771 | switch (r) |
2772 | { | |
2773 | case bfd_reloc_ok: | |
2774 | continue; | |
2775 | ||
2776 | case bfd_reloc_overflow: | |
2777 | info->callbacks->reloc_overflow | |
2778 | (info, (h ? &h->root : NULL), name, howto->name, | |
2779 | (bfd_vma) 0, input_bfd, input_section, rel->r_offset); | |
2780 | break; | |
2781 | ||
2782 | case bfd_reloc_undefined: | |
2783 | info->callbacks->undefined_symbol | |
2784 | (info, name, input_bfd, input_section, rel->r_offset, | |
0a1b45a2 | 2785 | true); |
e23eba97 NC |
2786 | break; |
2787 | ||
2788 | case bfd_reloc_outofrange: | |
330a6637 JW |
2789 | if (msg == NULL) |
2790 | msg = _("%X%P: internal error: out of range error\n"); | |
e23eba97 NC |
2791 | break; |
2792 | ||
2793 | case bfd_reloc_notsupported: | |
330a6637 JW |
2794 | if (msg == NULL) |
2795 | msg = _("%X%P: internal error: unsupported relocation error\n"); | |
e23eba97 NC |
2796 | break; |
2797 | ||
2798 | case bfd_reloc_dangerous: | |
330a6637 JW |
2799 | /* The error message should already be set. */ |
2800 | if (msg == NULL) | |
2801 | msg = _("dangerous relocation error"); | |
2a0d9853 | 2802 | info->callbacks->reloc_dangerous |
330a6637 | 2803 | (info, msg, input_bfd, input_section, rel->r_offset); |
e23eba97 NC |
2804 | break; |
2805 | ||
2806 | default: | |
2a0d9853 | 2807 | msg = _("%X%P: internal error: unknown error\n"); |
e23eba97 NC |
2808 | break; |
2809 | } | |
2810 | ||
330a6637 JW |
2811 | /* Do not report error message for the dangerous relocation again. */ |
2812 | if (msg && r != bfd_reloc_dangerous) | |
2a0d9853 JW |
2813 | info->callbacks->einfo (msg); |
2814 | ||
c9594989 AM |
2815 | /* Free the unused `msg_buf`. */ |
2816 | free (msg_buf); | |
330a6637 | 2817 | |
3f48fe4a JW |
2818 | /* We already reported the error via a callback, so don't try to report |
2819 | it again by returning false. That leads to spurious errors. */ | |
0a1b45a2 | 2820 | ret = true; |
e23eba97 NC |
2821 | goto out; |
2822 | } | |
2823 | ||
2824 | ret = riscv_resolve_pcrel_lo_relocs (&pcrel_relocs); | |
dc1e8a47 | 2825 | out: |
e23eba97 NC |
2826 | riscv_free_pcrel_relocs (&pcrel_relocs); |
2827 | return ret; | |
2828 | } | |
2829 | ||
2830 | /* Finish up dynamic symbol handling. We set the contents of various | |
2831 | dynamic sections here. */ | |
2832 | ||
0a1b45a2 | 2833 | static bool |
e23eba97 NC |
2834 | riscv_elf_finish_dynamic_symbol (bfd *output_bfd, |
2835 | struct bfd_link_info *info, | |
2836 | struct elf_link_hash_entry *h, | |
2837 | Elf_Internal_Sym *sym) | |
2838 | { | |
2839 | struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info); | |
2840 | const struct elf_backend_data *bed = get_elf_backend_data (output_bfd); | |
2841 | ||
2842 | if (h->plt.offset != (bfd_vma) -1) | |
2843 | { | |
2844 | /* We've decided to create a PLT entry for this symbol. */ | |
2845 | bfd_byte *loc; | |
02dd9d25 | 2846 | bfd_vma i, header_address, plt_idx, got_offset, got_address; |
e23eba97 NC |
2847 | uint32_t plt_entry[PLT_ENTRY_INSNS]; |
2848 | Elf_Internal_Rela rela; | |
02dd9d25 NC |
2849 | asection *plt, *gotplt, *relplt; |
2850 | ||
2851 | /* When building a static executable, use .iplt, .igot.plt and | |
2852 | .rela.iplt sections for STT_GNU_IFUNC symbols. */ | |
2853 | if (htab->elf.splt != NULL) | |
2854 | { | |
2855 | plt = htab->elf.splt; | |
2856 | gotplt = htab->elf.sgotplt; | |
2857 | relplt = htab->elf.srelplt; | |
2858 | } | |
2859 | else | |
2860 | { | |
2861 | plt = htab->elf.iplt; | |
2862 | gotplt = htab->elf.igotplt; | |
2863 | relplt = htab->elf.irelplt; | |
2864 | } | |
2865 | ||
2866 | /* This symbol has an entry in the procedure linkage table. Set | |
2867 | it up. */ | |
2868 | if ((h->dynindx == -1 | |
2869 | && !((h->forced_local || bfd_link_executable (info)) | |
2870 | && h->def_regular | |
2871 | && h->type == STT_GNU_IFUNC)) | |
2872 | || plt == NULL | |
2873 | || gotplt == NULL | |
2874 | || relplt == NULL) | |
0a1b45a2 | 2875 | return false; |
e23eba97 NC |
2876 | |
2877 | /* Calculate the address of the PLT header. */ | |
02dd9d25 | 2878 | header_address = sec_addr (plt); |
e23eba97 | 2879 | |
02dd9d25 NC |
2880 | /* Calculate the index of the entry and the offset of .got.plt entry. |
2881 | For static executables, we don't reserve anything. */ | |
2882 | if (plt == htab->elf.splt) | |
2883 | { | |
2884 | plt_idx = (h->plt.offset - PLT_HEADER_SIZE) / PLT_ENTRY_SIZE; | |
2885 | got_offset = GOTPLT_HEADER_SIZE + (plt_idx * GOT_ENTRY_SIZE); | |
2886 | } | |
2887 | else | |
2888 | { | |
2889 | plt_idx = h->plt.offset / PLT_ENTRY_SIZE; | |
2890 | got_offset = plt_idx * GOT_ENTRY_SIZE; | |
2891 | } | |
e23eba97 NC |
2892 | |
2893 | /* Calculate the address of the .got.plt entry. */ | |
02dd9d25 | 2894 | got_address = sec_addr (gotplt) + got_offset; |
e23eba97 NC |
2895 | |
2896 | /* Find out where the .plt entry should go. */ | |
02dd9d25 | 2897 | loc = plt->contents + h->plt.offset; |
e23eba97 NC |
2898 | |
2899 | /* Fill in the PLT entry itself. */ | |
5ef23793 JW |
2900 | if (! riscv_make_plt_entry (output_bfd, got_address, |
2901 | header_address + h->plt.offset, | |
2902 | plt_entry)) | |
0a1b45a2 | 2903 | return false; |
5ef23793 | 2904 | |
e23eba97 | 2905 | for (i = 0; i < PLT_ENTRY_INSNS; i++) |
fbc09e7a | 2906 | bfd_putl32 (plt_entry[i], loc + 4*i); |
e23eba97 NC |
2907 | |
2908 | /* Fill in the initial value of the .got.plt entry. */ | |
02dd9d25 NC |
2909 | loc = gotplt->contents + (got_address - sec_addr (gotplt)); |
2910 | bfd_put_NN (output_bfd, sec_addr (plt), loc); | |
e23eba97 | 2911 | |
e23eba97 | 2912 | rela.r_offset = got_address; |
e23eba97 | 2913 | |
02dd9d25 NC |
2914 | if (h->dynindx == -1 |
2915 | || ((bfd_link_executable (info) | |
2916 | || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) | |
2917 | && h->def_regular | |
2918 | && h->type == STT_GNU_IFUNC)) | |
2919 | { | |
2920 | info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"), | |
2921 | h->root.root.string, | |
2922 | h->root.u.def.section->owner); | |
2923 | ||
2924 | /* If an STT_GNU_IFUNC symbol is locally defined, generate | |
2925 | R_RISCV_IRELATIVE instead of R_RISCV_JUMP_SLOT. */ | |
2926 | asection *sec = h->root.u.def.section; | |
2927 | rela.r_info = ELFNN_R_INFO (0, R_RISCV_IRELATIVE); | |
2928 | rela.r_addend = h->root.u.def.value | |
2929 | + sec->output_section->vma | |
2930 | + sec->output_offset; | |
2931 | } | |
2932 | else | |
2933 | { | |
2934 | /* Fill in the entry in the .rela.plt section. */ | |
2935 | rela.r_info = ELFNN_R_INFO (h->dynindx, R_RISCV_JUMP_SLOT); | |
2936 | rela.r_addend = 0; | |
2937 | } | |
2938 | ||
2939 | loc = relplt->contents + plt_idx * sizeof (ElfNN_External_Rela); | |
e23eba97 NC |
2940 | bed->s->swap_reloca_out (output_bfd, &rela, loc); |
2941 | ||
2942 | if (!h->def_regular) | |
2943 | { | |
2944 | /* Mark the symbol as undefined, rather than as defined in | |
2945 | the .plt section. Leave the value alone. */ | |
2946 | sym->st_shndx = SHN_UNDEF; | |
2947 | /* If the symbol is weak, we do need to clear the value. | |
2948 | Otherwise, the PLT entry would provide a definition for | |
2949 | the symbol even if the symbol wasn't defined anywhere, | |
2950 | and so the symbol would never be NULL. */ | |
2951 | if (!h->ref_regular_nonweak) | |
2952 | sym->st_value = 0; | |
2953 | } | |
2954 | } | |
2955 | ||
2956 | if (h->got.offset != (bfd_vma) -1 | |
6487709f JW |
2957 | && !(riscv_elf_hash_entry (h)->tls_type & (GOT_TLS_GD | GOT_TLS_IE)) |
2958 | && !UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)) | |
e23eba97 NC |
2959 | { |
2960 | asection *sgot; | |
2961 | asection *srela; | |
2962 | Elf_Internal_Rela rela; | |
0a1b45a2 | 2963 | bool use_elf_append_rela = true; |
e23eba97 NC |
2964 | |
2965 | /* This symbol has an entry in the GOT. Set it up. */ | |
2966 | ||
2967 | sgot = htab->elf.sgot; | |
2968 | srela = htab->elf.srelgot; | |
2969 | BFD_ASSERT (sgot != NULL && srela != NULL); | |
2970 | ||
2971 | rela.r_offset = sec_addr (sgot) + (h->got.offset &~ (bfd_vma) 1); | |
2972 | ||
02dd9d25 NC |
2973 | /* Handle the ifunc symbol in GOT entry. */ |
2974 | if (h->def_regular | |
2975 | && h->type == STT_GNU_IFUNC) | |
2976 | { | |
2977 | if (h->plt.offset == (bfd_vma) -1) | |
2978 | { | |
2979 | /* STT_GNU_IFUNC is referenced without PLT. */ | |
51a8a7c2 | 2980 | |
02dd9d25 NC |
2981 | if (htab->elf.splt == NULL) |
2982 | { | |
51a8a7c2 | 2983 | /* Use .rela.iplt section to store .got relocations |
02dd9d25 NC |
2984 | in static executable. */ |
2985 | srela = htab->elf.irelplt; | |
51a8a7c2 NC |
2986 | |
2987 | /* Do not use riscv_elf_append_rela to add dynamic | |
2988 | relocs. */ | |
0a1b45a2 | 2989 | use_elf_append_rela = false; |
02dd9d25 | 2990 | } |
51a8a7c2 | 2991 | |
02dd9d25 NC |
2992 | if (SYMBOL_REFERENCES_LOCAL (info, h)) |
2993 | { | |
2994 | info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"), | |
2995 | h->root.root.string, | |
2996 | h->root.u.def.section->owner); | |
2997 | ||
2998 | rela.r_info = ELFNN_R_INFO (0, R_RISCV_IRELATIVE); | |
2999 | rela.r_addend = (h->root.u.def.value | |
3000 | + h->root.u.def.section->output_section->vma | |
3001 | + h->root.u.def.section->output_offset); | |
3002 | } | |
3003 | else | |
3004 | { | |
3005 | /* Generate R_RISCV_NN. */ | |
1942a048 | 3006 | BFD_ASSERT ((h->got.offset & 1) == 0); |
02dd9d25 NC |
3007 | BFD_ASSERT (h->dynindx != -1); |
3008 | rela.r_info = ELFNN_R_INFO (h->dynindx, R_RISCV_NN); | |
3009 | rela.r_addend = 0; | |
3010 | } | |
3011 | } | |
3012 | else if (bfd_link_pic (info)) | |
3013 | { | |
3014 | /* Generate R_RISCV_NN. */ | |
1942a048 | 3015 | BFD_ASSERT ((h->got.offset & 1) == 0); |
02dd9d25 NC |
3016 | BFD_ASSERT (h->dynindx != -1); |
3017 | rela.r_info = ELFNN_R_INFO (h->dynindx, R_RISCV_NN); | |
3018 | rela.r_addend = 0; | |
3019 | } | |
3020 | else | |
3021 | { | |
3022 | asection *plt; | |
3023 | ||
3024 | if (!h->pointer_equality_needed) | |
3025 | abort (); | |
3026 | ||
3027 | /* For non-shared object, we can't use .got.plt, which | |
3028 | contains the real function address if we need pointer | |
3029 | equality. We load the GOT entry with the PLT entry. */ | |
3030 | plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt; | |
3031 | bfd_put_NN (output_bfd, (plt->output_section->vma | |
3032 | + plt->output_offset | |
3033 | + h->plt.offset), | |
3034 | htab->elf.sgot->contents | |
3035 | + (h->got.offset & ~(bfd_vma) 1)); | |
0a1b45a2 | 3036 | return true; |
02dd9d25 NC |
3037 | } |
3038 | } | |
02dd9d25 NC |
3039 | else if (bfd_link_pic (info) |
3040 | && SYMBOL_REFERENCES_LOCAL (info, h)) | |
e23eba97 | 3041 | { |
51a8a7c2 NC |
3042 | /* If this is a local symbol reference, we just want to emit |
3043 | a RELATIVE reloc. This can happen if it is a -Bsymbolic link, | |
3044 | or a pie link, or the symbol was forced to be local because | |
3045 | of a version file. The entry in the global offset table will | |
3046 | already have been initialized in the relocate_section function. */ | |
1942a048 | 3047 | BFD_ASSERT ((h->got.offset & 1) != 0); |
e23eba97 NC |
3048 | asection *sec = h->root.u.def.section; |
3049 | rela.r_info = ELFNN_R_INFO (0, R_RISCV_RELATIVE); | |
3050 | rela.r_addend = (h->root.u.def.value | |
3051 | + sec->output_section->vma | |
3052 | + sec->output_offset); | |
3053 | } | |
3054 | else | |
3055 | { | |
1942a048 | 3056 | BFD_ASSERT ((h->got.offset & 1) == 0); |
e23eba97 NC |
3057 | BFD_ASSERT (h->dynindx != -1); |
3058 | rela.r_info = ELFNN_R_INFO (h->dynindx, R_RISCV_NN); | |
3059 | rela.r_addend = 0; | |
3060 | } | |
3061 | ||
3062 | bfd_put_NN (output_bfd, 0, | |
3063 | sgot->contents + (h->got.offset & ~(bfd_vma) 1)); | |
51a8a7c2 NC |
3064 | |
3065 | if (use_elf_append_rela) | |
3066 | riscv_elf_append_rela (output_bfd, srela, &rela); | |
3067 | else | |
3068 | { | |
3069 | /* Use riscv_elf_append_rela to add the dynamic relocs into | |
3070 | .rela.iplt may cause the overwrite problems. Since we insert | |
3071 | the relocs for PLT didn't handle the reloc_index of .rela.iplt, | |
3072 | but the riscv_elf_append_rela adds the relocs to the place | |
3073 | that are calculated from the reloc_index (in seqential). | |
3074 | ||
3075 | One solution is that add these dynamic relocs (GOT IFUNC) | |
3076 | from the last of .rela.iplt section. */ | |
3077 | bfd_vma iplt_idx = htab->last_iplt_index--; | |
3078 | bfd_byte *loc = srela->contents | |
3079 | + iplt_idx * sizeof (ElfNN_External_Rela); | |
3080 | bed->s->swap_reloca_out (output_bfd, &rela, loc); | |
3081 | } | |
e23eba97 NC |
3082 | } |
3083 | ||
3084 | if (h->needs_copy) | |
3085 | { | |
3086 | Elf_Internal_Rela rela; | |
5474d94f | 3087 | asection *s; |
e23eba97 NC |
3088 | |
3089 | /* This symbols needs a copy reloc. Set it up. */ | |
3090 | BFD_ASSERT (h->dynindx != -1); | |
3091 | ||
3092 | rela.r_offset = sec_addr (h->root.u.def.section) + h->root.u.def.value; | |
3093 | rela.r_info = ELFNN_R_INFO (h->dynindx, R_RISCV_COPY); | |
3094 | rela.r_addend = 0; | |
afbf7e8e | 3095 | if (h->root.u.def.section == htab->elf.sdynrelro) |
5474d94f AM |
3096 | s = htab->elf.sreldynrelro; |
3097 | else | |
3098 | s = htab->elf.srelbss; | |
3099 | riscv_elf_append_rela (output_bfd, s, &rela); | |
e23eba97 NC |
3100 | } |
3101 | ||
3102 | /* Mark some specially defined symbols as absolute. */ | |
3103 | if (h == htab->elf.hdynamic | |
3104 | || (h == htab->elf.hgot || h == htab->elf.hplt)) | |
3105 | sym->st_shndx = SHN_ABS; | |
3106 | ||
0a1b45a2 | 3107 | return true; |
e23eba97 NC |
3108 | } |
3109 | ||
02dd9d25 NC |
3110 | /* Finish up local dynamic symbol handling. We set the contents of |
3111 | various dynamic sections here. */ | |
3112 | ||
1201fda6 | 3113 | static int |
02dd9d25 NC |
3114 | riscv_elf_finish_local_dynamic_symbol (void **slot, void *inf) |
3115 | { | |
3116 | struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) *slot; | |
3117 | struct bfd_link_info *info = (struct bfd_link_info *) inf; | |
3118 | ||
3119 | return riscv_elf_finish_dynamic_symbol (info->output_bfd, info, h, NULL); | |
3120 | } | |
3121 | ||
e23eba97 NC |
3122 | /* Finish up the dynamic sections. */ |
3123 | ||
0a1b45a2 | 3124 | static bool |
e23eba97 NC |
3125 | riscv_finish_dyn (bfd *output_bfd, struct bfd_link_info *info, |
3126 | bfd *dynobj, asection *sdyn) | |
3127 | { | |
3128 | struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info); | |
3129 | const struct elf_backend_data *bed = get_elf_backend_data (output_bfd); | |
3130 | size_t dynsize = bed->s->sizeof_dyn; | |
3131 | bfd_byte *dyncon, *dynconend; | |
3132 | ||
3133 | dynconend = sdyn->contents + sdyn->size; | |
3134 | for (dyncon = sdyn->contents; dyncon < dynconend; dyncon += dynsize) | |
3135 | { | |
3136 | Elf_Internal_Dyn dyn; | |
3137 | asection *s; | |
3138 | ||
3139 | bed->s->swap_dyn_in (dynobj, dyncon, &dyn); | |
3140 | ||
3141 | switch (dyn.d_tag) | |
3142 | { | |
3143 | case DT_PLTGOT: | |
3144 | s = htab->elf.sgotplt; | |
3145 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; | |
3146 | break; | |
3147 | case DT_JMPREL: | |
3148 | s = htab->elf.srelplt; | |
3149 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; | |
3150 | break; | |
3151 | case DT_PLTRELSZ: | |
3152 | s = htab->elf.srelplt; | |
3153 | dyn.d_un.d_val = s->size; | |
3154 | break; | |
3155 | default: | |
3156 | continue; | |
3157 | } | |
3158 | ||
3159 | bed->s->swap_dyn_out (output_bfd, &dyn, dyncon); | |
3160 | } | |
0a1b45a2 | 3161 | return true; |
e23eba97 NC |
3162 | } |
3163 | ||
0a1b45a2 | 3164 | static bool |
e23eba97 NC |
3165 | riscv_elf_finish_dynamic_sections (bfd *output_bfd, |
3166 | struct bfd_link_info *info) | |
3167 | { | |
3168 | bfd *dynobj; | |
3169 | asection *sdyn; | |
3170 | struct riscv_elf_link_hash_table *htab; | |
3171 | ||
3172 | htab = riscv_elf_hash_table (info); | |
3173 | BFD_ASSERT (htab != NULL); | |
3174 | dynobj = htab->elf.dynobj; | |
3175 | ||
3176 | sdyn = bfd_get_linker_section (dynobj, ".dynamic"); | |
3177 | ||
3178 | if (elf_hash_table (info)->dynamic_sections_created) | |
3179 | { | |
3180 | asection *splt; | |
0a1b45a2 | 3181 | bool ret; |
e23eba97 NC |
3182 | |
3183 | splt = htab->elf.splt; | |
3184 | BFD_ASSERT (splt != NULL && sdyn != NULL); | |
3185 | ||
3186 | ret = riscv_finish_dyn (output_bfd, info, dynobj, sdyn); | |
3187 | ||
535b785f | 3188 | if (!ret) |
e23eba97 NC |
3189 | return ret; |
3190 | ||
3191 | /* Fill in the head and tail entries in the procedure linkage table. */ | |
3192 | if (splt->size > 0) | |
3193 | { | |
3194 | int i; | |
3195 | uint32_t plt_header[PLT_HEADER_INSNS]; | |
5ef23793 JW |
3196 | ret = riscv_make_plt_header (output_bfd, |
3197 | sec_addr (htab->elf.sgotplt), | |
3198 | sec_addr (splt), plt_header); | |
3199 | if (!ret) | |
3200 | return ret; | |
e23eba97 NC |
3201 | |
3202 | for (i = 0; i < PLT_HEADER_INSNS; i++) | |
fbc09e7a | 3203 | bfd_putl32 (plt_header[i], splt->contents + 4*i); |
e23eba97 | 3204 | |
cc162427 AW |
3205 | elf_section_data (splt->output_section)->this_hdr.sh_entsize |
3206 | = PLT_ENTRY_SIZE; | |
3207 | } | |
e23eba97 NC |
3208 | } |
3209 | ||
3210 | if (htab->elf.sgotplt) | |
3211 | { | |
3212 | asection *output_section = htab->elf.sgotplt->output_section; | |
3213 | ||
3214 | if (bfd_is_abs_section (output_section)) | |
3215 | { | |
3216 | (*_bfd_error_handler) | |
871b3ab2 | 3217 | (_("discarded output section: `%pA'"), htab->elf.sgotplt); |
0a1b45a2 | 3218 | return false; |
e23eba97 NC |
3219 | } |
3220 | ||
3221 | if (htab->elf.sgotplt->size > 0) | |
3222 | { | |
3223 | /* Write the first two entries in .got.plt, needed for the dynamic | |
3224 | linker. */ | |
3225 | bfd_put_NN (output_bfd, (bfd_vma) -1, htab->elf.sgotplt->contents); | |
3226 | bfd_put_NN (output_bfd, (bfd_vma) 0, | |
3227 | htab->elf.sgotplt->contents + GOT_ENTRY_SIZE); | |
3228 | } | |
3229 | ||
3230 | elf_section_data (output_section)->this_hdr.sh_entsize = GOT_ENTRY_SIZE; | |
3231 | } | |
3232 | ||
3233 | if (htab->elf.sgot) | |
3234 | { | |
3235 | asection *output_section = htab->elf.sgot->output_section; | |
3236 | ||
3237 | if (htab->elf.sgot->size > 0) | |
3238 | { | |
3239 | /* Set the first entry in the global offset table to the address of | |
3240 | the dynamic section. */ | |
3241 | bfd_vma val = sdyn ? sec_addr (sdyn) : 0; | |
3242 | bfd_put_NN (output_bfd, val, htab->elf.sgot->contents); | |
3243 | } | |
3244 | ||
3245 | elf_section_data (output_section)->this_hdr.sh_entsize = GOT_ENTRY_SIZE; | |
3246 | } | |
3247 | ||
02dd9d25 NC |
3248 | /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */ |
3249 | htab_traverse (htab->loc_hash_table, | |
3250 | riscv_elf_finish_local_dynamic_symbol, | |
3251 | info); | |
3252 | ||
0a1b45a2 | 3253 | return true; |
e23eba97 NC |
3254 | } |
3255 | ||
3256 | /* Return address for Ith PLT stub in section PLT, for relocation REL | |
3257 | or (bfd_vma) -1 if it should not be included. */ | |
3258 | ||
3259 | static bfd_vma | |
3260 | riscv_elf_plt_sym_val (bfd_vma i, const asection *plt, | |
3261 | const arelent *rel ATTRIBUTE_UNUSED) | |
3262 | { | |
3263 | return plt->vma + PLT_HEADER_SIZE + i * PLT_ENTRY_SIZE; | |
3264 | } | |
3265 | ||
3266 | static enum elf_reloc_type_class | |
3267 | riscv_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED, | |
3268 | const asection *rel_sec ATTRIBUTE_UNUSED, | |
3269 | const Elf_Internal_Rela *rela) | |
3270 | { | |
3271 | switch (ELFNN_R_TYPE (rela->r_info)) | |
3272 | { | |
3273 | case R_RISCV_RELATIVE: | |
3274 | return reloc_class_relative; | |
3275 | case R_RISCV_JUMP_SLOT: | |
3276 | return reloc_class_plt; | |
3277 | case R_RISCV_COPY: | |
3278 | return reloc_class_copy; | |
3279 | default: | |
3280 | return reloc_class_normal; | |
3281 | } | |
3282 | } | |
3283 | ||
0242af40 JW |
3284 | /* Given the ELF header flags in FLAGS, it returns a string that describes the |
3285 | float ABI. */ | |
3286 | ||
3287 | static const char * | |
3288 | riscv_float_abi_string (flagword flags) | |
3289 | { | |
3290 | switch (flags & EF_RISCV_FLOAT_ABI) | |
3291 | { | |
3292 | case EF_RISCV_FLOAT_ABI_SOFT: | |
3293 | return "soft-float"; | |
3294 | break; | |
3295 | case EF_RISCV_FLOAT_ABI_SINGLE: | |
3296 | return "single-float"; | |
3297 | break; | |
3298 | case EF_RISCV_FLOAT_ABI_DOUBLE: | |
3299 | return "double-float"; | |
3300 | break; | |
3301 | case EF_RISCV_FLOAT_ABI_QUAD: | |
3302 | return "quad-float"; | |
3303 | break; | |
3304 | default: | |
3305 | abort (); | |
3306 | } | |
3307 | } | |
3308 | ||
dcd709e0 | 3309 | /* The information of architecture elf attributes. */ |
7d7a7d7c JW |
3310 | static riscv_subset_list_t in_subsets; |
3311 | static riscv_subset_list_t out_subsets; | |
3312 | static riscv_subset_list_t merged_subsets; | |
3313 | ||
3314 | /* Predicator for standard extension. */ | |
3315 | ||
0a1b45a2 | 3316 | static bool |
7d7a7d7c JW |
3317 | riscv_std_ext_p (const char *name) |
3318 | { | |
3319 | return (strlen (name) == 1) && (name[0] != 'x') && (name[0] != 's'); | |
3320 | } | |
3321 | ||
32f0ce4d | 3322 | /* Check if the versions are compatible. */ |
7d7a7d7c | 3323 | |
0a1b45a2 | 3324 | static bool |
7d7a7d7c JW |
3325 | riscv_version_mismatch (bfd *ibfd, |
3326 | struct riscv_subset_t *in, | |
3327 | struct riscv_subset_t *out) | |
3328 | { | |
32f0ce4d | 3329 | if (in == NULL || out == NULL) |
0a1b45a2 | 3330 | return true; |
32f0ce4d NC |
3331 | |
3332 | /* Since there are no version conflicts for now, we just report | |
3333 | warning when the versions are mis-matched. */ | |
3334 | if (in->major_version != out->major_version | |
3335 | || in->minor_version != out->minor_version) | |
3336 | { | |
3337 | _bfd_error_handler | |
3338 | (_("warning: %pB: mis-matched ISA version %d.%d for '%s' " | |
3339 | "extension, the output version is %d.%d"), | |
3340 | ibfd, | |
3341 | in->major_version, | |
3342 | in->minor_version, | |
3343 | in->name, | |
3344 | out->major_version, | |
3345 | out->minor_version); | |
3346 | ||
3347 | /* Update the output ISA versions to the newest ones. */ | |
3348 | if ((in->major_version > out->major_version) | |
3349 | || (in->major_version == out->major_version | |
3350 | && in->minor_version > out->minor_version)) | |
3351 | { | |
3352 | out->major_version = in->major_version; | |
3353 | out->minor_version = in->minor_version; | |
3354 | } | |
3355 | } | |
3356 | ||
0a1b45a2 | 3357 | return true; |
7d7a7d7c JW |
3358 | } |
3359 | ||
3360 | /* Return true if subset is 'i' or 'e'. */ | |
3361 | ||
0a1b45a2 | 3362 | static bool |
7d7a7d7c JW |
3363 | riscv_i_or_e_p (bfd *ibfd, |
3364 | const char *arch, | |
3365 | struct riscv_subset_t *subset) | |
3366 | { | |
3367 | if ((strcasecmp (subset->name, "e") != 0) | |
3368 | && (strcasecmp (subset->name, "i") != 0)) | |
3369 | { | |
3370 | _bfd_error_handler | |
9184ef8a NC |
3371 | (_("error: %pB: corrupted ISA string '%s'. " |
3372 | "First letter should be 'i' or 'e' but got '%s'"), | |
7d7a7d7c | 3373 | ibfd, arch, subset->name); |
0a1b45a2 | 3374 | return false; |
7d7a7d7c | 3375 | } |
0a1b45a2 | 3376 | return true; |
7d7a7d7c JW |
3377 | } |
3378 | ||
3379 | /* Merge standard extensions. | |
3380 | ||
3381 | Return Value: | |
3382 | Return FALSE if failed to merge. | |
3383 | ||
3384 | Arguments: | |
3385 | `bfd`: bfd handler. | |
dcd709e0 NC |
3386 | `in_arch`: Raw ISA string for input object. |
3387 | `out_arch`: Raw ISA string for output object. | |
3388 | `pin`: Subset list for input object. | |
3389 | `pout`: Subset list for output object. */ | |
7d7a7d7c | 3390 | |
0a1b45a2 | 3391 | static bool |
7d7a7d7c JW |
3392 | riscv_merge_std_ext (bfd *ibfd, |
3393 | const char *in_arch, | |
3394 | const char *out_arch, | |
3395 | struct riscv_subset_t **pin, | |
3396 | struct riscv_subset_t **pout) | |
3397 | { | |
3398 | const char *standard_exts = riscv_supported_std_ext (); | |
3399 | const char *p; | |
3400 | struct riscv_subset_t *in = *pin; | |
3401 | struct riscv_subset_t *out = *pout; | |
3402 | ||
3403 | /* First letter should be 'i' or 'e'. */ | |
3404 | if (!riscv_i_or_e_p (ibfd, in_arch, in)) | |
0a1b45a2 | 3405 | return false; |
7d7a7d7c JW |
3406 | |
3407 | if (!riscv_i_or_e_p (ibfd, out_arch, out)) | |
0a1b45a2 | 3408 | return false; |
7d7a7d7c | 3409 | |
8f595e9b | 3410 | if (strcasecmp (in->name, out->name) != 0) |
7d7a7d7c JW |
3411 | { |
3412 | /* TODO: We might allow merge 'i' with 'e'. */ | |
3413 | _bfd_error_handler | |
9184ef8a | 3414 | (_("error: %pB: mis-matched ISA string to merge '%s' and '%s'"), |
7d7a7d7c | 3415 | ibfd, in->name, out->name); |
0a1b45a2 | 3416 | return false; |
7d7a7d7c | 3417 | } |
32f0ce4d | 3418 | else if (!riscv_version_mismatch (ibfd, in, out)) |
0a1b45a2 | 3419 | return false; |
7d7a7d7c JW |
3420 | else |
3421 | riscv_add_subset (&merged_subsets, | |
32f0ce4d | 3422 | out->name, out->major_version, out->minor_version); |
7d7a7d7c JW |
3423 | |
3424 | in = in->next; | |
3425 | out = out->next; | |
3426 | ||
3427 | /* Handle standard extension first. */ | |
3428 | for (p = standard_exts; *p; ++p) | |
3429 | { | |
dfe92496 | 3430 | struct riscv_subset_t *ext_in, *ext_out, *ext_merged; |
7d7a7d7c | 3431 | char find_ext[2] = {*p, '\0'}; |
0a1b45a2 | 3432 | bool find_in, find_out; |
7d7a7d7c | 3433 | |
dfe92496 NC |
3434 | find_in = riscv_lookup_subset (&in_subsets, find_ext, &ext_in); |
3435 | find_out = riscv_lookup_subset (&out_subsets, find_ext, &ext_out); | |
3436 | ||
3437 | if (!find_in && !find_out) | |
7d7a7d7c JW |
3438 | continue; |
3439 | ||
dfe92496 NC |
3440 | if (find_in |
3441 | && find_out | |
3442 | && !riscv_version_mismatch (ibfd, ext_in, ext_out)) | |
0a1b45a2 | 3443 | return false; |
7d7a7d7c | 3444 | |
dfe92496 NC |
3445 | ext_merged = find_out ? ext_out : ext_in; |
3446 | riscv_add_subset (&merged_subsets, ext_merged->name, | |
3447 | ext_merged->major_version, ext_merged->minor_version); | |
7d7a7d7c JW |
3448 | } |
3449 | ||
3450 | /* Skip all standard extensions. */ | |
3451 | while ((in != NULL) && riscv_std_ext_p (in->name)) in = in->next; | |
3452 | while ((out != NULL) && riscv_std_ext_p (out->name)) out = out->next; | |
3453 | ||
3454 | *pin = in; | |
3455 | *pout = out; | |
3456 | ||
0a1b45a2 | 3457 | return true; |
7d7a7d7c JW |
3458 | } |
3459 | ||
403d1bd9 JW |
3460 | /* Merge multi letter extensions. PIN is a pointer to the head of the input |
3461 | object subset list. Likewise for POUT and the output object. Return TRUE | |
3462 | on success and FALSE when a conflict is found. */ | |
7d7a7d7c | 3463 | |
0a1b45a2 | 3464 | static bool |
403d1bd9 JW |
3465 | riscv_merge_multi_letter_ext (bfd *ibfd, |
3466 | riscv_subset_t **pin, | |
3467 | riscv_subset_t **pout) | |
7d7a7d7c JW |
3468 | { |
3469 | riscv_subset_t *in = *pin; | |
3470 | riscv_subset_t *out = *pout; | |
403d1bd9 | 3471 | riscv_subset_t *tail; |
7d7a7d7c | 3472 | |
403d1bd9 | 3473 | int cmp; |
7d7a7d7c | 3474 | |
403d1bd9 | 3475 | while (in && out) |
7d7a7d7c | 3476 | { |
4c0e540e | 3477 | cmp = riscv_compare_subsets (in->name, out->name); |
403d1bd9 JW |
3478 | |
3479 | if (cmp < 0) | |
3480 | { | |
3481 | /* `in' comes before `out', append `in' and increment. */ | |
3482 | riscv_add_subset (&merged_subsets, in->name, in->major_version, | |
3483 | in->minor_version); | |
3484 | in = in->next; | |
3485 | } | |
3486 | else if (cmp > 0) | |
3487 | { | |
3488 | /* `out' comes before `in', append `out' and increment. */ | |
3489 | riscv_add_subset (&merged_subsets, out->name, out->major_version, | |
3490 | out->minor_version); | |
3491 | out = out->next; | |
3492 | } | |
3493 | else | |
7d7a7d7c | 3494 | { |
403d1bd9 | 3495 | /* Both present, check version and increment both. */ |
32f0ce4d | 3496 | if (!riscv_version_mismatch (ibfd, in, out)) |
0a1b45a2 | 3497 | return false; |
403d1bd9 JW |
3498 | |
3499 | riscv_add_subset (&merged_subsets, out->name, out->major_version, | |
3500 | out->minor_version); | |
3501 | out = out->next; | |
3502 | in = in->next; | |
7d7a7d7c | 3503 | } |
7d7a7d7c JW |
3504 | } |
3505 | ||
1942a048 NC |
3506 | if (in || out) |
3507 | { | |
3508 | /* If we're here, either `in' or `out' is running longer than | |
3509 | the other. So, we need to append the corresponding tail. */ | |
3510 | tail = in ? in : out; | |
3511 | while (tail) | |
3512 | { | |
3513 | riscv_add_subset (&merged_subsets, tail->name, tail->major_version, | |
3514 | tail->minor_version); | |
3515 | tail = tail->next; | |
3516 | } | |
3517 | } | |
403d1bd9 | 3518 | |
0a1b45a2 | 3519 | return true; |
7d7a7d7c JW |
3520 | } |
3521 | ||
3522 | /* Merge Tag_RISCV_arch attribute. */ | |
3523 | ||
3524 | static char * | |
3525 | riscv_merge_arch_attr_info (bfd *ibfd, char *in_arch, char *out_arch) | |
3526 | { | |
3527 | riscv_subset_t *in, *out; | |
3528 | char *merged_arch_str; | |
3529 | ||
3530 | unsigned xlen_in, xlen_out; | |
3531 | merged_subsets.head = NULL; | |
3532 | merged_subsets.tail = NULL; | |
3533 | ||
3534 | riscv_parse_subset_t rpe_in; | |
3535 | riscv_parse_subset_t rpe_out; | |
3536 | ||
8f595e9b NC |
3537 | /* Only assembler needs to check the default version of ISA, so just set |
3538 | the rpe_in.get_default_version and rpe_out.get_default_version to NULL. */ | |
7d7a7d7c JW |
3539 | rpe_in.subset_list = &in_subsets; |
3540 | rpe_in.error_handler = _bfd_error_handler; | |
3541 | rpe_in.xlen = &xlen_in; | |
8f595e9b | 3542 | rpe_in.get_default_version = NULL; |
7d7a7d7c JW |
3543 | |
3544 | rpe_out.subset_list = &out_subsets; | |
3545 | rpe_out.error_handler = _bfd_error_handler; | |
3546 | rpe_out.xlen = &xlen_out; | |
8f595e9b | 3547 | rpe_out.get_default_version = NULL; |
7d7a7d7c JW |
3548 | |
3549 | if (in_arch == NULL && out_arch == NULL) | |
3550 | return NULL; | |
3551 | ||
3552 | if (in_arch == NULL && out_arch != NULL) | |
3553 | return out_arch; | |
3554 | ||
3555 | if (in_arch != NULL && out_arch == NULL) | |
3556 | return in_arch; | |
3557 | ||
dcd709e0 | 3558 | /* Parse subset from ISA string. */ |
7d7a7d7c JW |
3559 | if (!riscv_parse_subset (&rpe_in, in_arch)) |
3560 | return NULL; | |
3561 | ||
3562 | if (!riscv_parse_subset (&rpe_out, out_arch)) | |
3563 | return NULL; | |
3564 | ||
3565 | /* Checking XLEN. */ | |
3566 | if (xlen_out != xlen_in) | |
3567 | { | |
3568 | _bfd_error_handler | |
3569 | (_("error: %pB: ISA string of input (%s) doesn't match " | |
9184ef8a | 3570 | "output (%s)"), ibfd, in_arch, out_arch); |
7d7a7d7c JW |
3571 | return NULL; |
3572 | } | |
3573 | ||
3574 | /* Merge subset list. */ | |
3575 | in = in_subsets.head; | |
3576 | out = out_subsets.head; | |
3577 | ||
3578 | /* Merge standard extension. */ | |
3579 | if (!riscv_merge_std_ext (ibfd, in_arch, out_arch, &in, &out)) | |
3580 | return NULL; | |
403d1bd9 JW |
3581 | |
3582 | /* Merge all non-single letter extensions with single call. */ | |
3583 | if (!riscv_merge_multi_letter_ext (ibfd, &in, &out)) | |
7d7a7d7c JW |
3584 | return NULL; |
3585 | ||
3586 | if (xlen_in != xlen_out) | |
3587 | { | |
3588 | _bfd_error_handler | |
3589 | (_("error: %pB: XLEN of input (%u) doesn't match " | |
9184ef8a | 3590 | "output (%u)"), ibfd, xlen_in, xlen_out); |
7d7a7d7c JW |
3591 | return NULL; |
3592 | } | |
3593 | ||
3594 | if (xlen_in != ARCH_SIZE) | |
3595 | { | |
3596 | _bfd_error_handler | |
9184ef8a NC |
3597 | (_("error: %pB: unsupported XLEN (%u), you might be " |
3598 | "using wrong emulation"), ibfd, xlen_in); | |
7d7a7d7c JW |
3599 | return NULL; |
3600 | } | |
3601 | ||
3602 | merged_arch_str = riscv_arch_str (ARCH_SIZE, &merged_subsets); | |
3603 | ||
3604 | /* Release the subset lists. */ | |
3605 | riscv_release_subset_list (&in_subsets); | |
3606 | riscv_release_subset_list (&out_subsets); | |
3607 | riscv_release_subset_list (&merged_subsets); | |
3608 | ||
3609 | return merged_arch_str; | |
3610 | } | |
3611 | ||
3612 | /* Merge object attributes from IBFD into output_bfd of INFO. | |
3613 | Raise an error if there are conflicting attributes. */ | |
3614 | ||
0a1b45a2 | 3615 | static bool |
7d7a7d7c JW |
3616 | riscv_merge_attributes (bfd *ibfd, struct bfd_link_info *info) |
3617 | { | |
3618 | bfd *obfd = info->output_bfd; | |
3619 | obj_attribute *in_attr; | |
3620 | obj_attribute *out_attr; | |
0a1b45a2 AM |
3621 | bool result = true; |
3622 | bool priv_attrs_merged = false; | |
7d7a7d7c JW |
3623 | const char *sec_name = get_elf_backend_data (ibfd)->obj_attrs_section; |
3624 | unsigned int i; | |
3625 | ||
3626 | /* Skip linker created files. */ | |
3627 | if (ibfd->flags & BFD_LINKER_CREATED) | |
0a1b45a2 | 3628 | return true; |
7d7a7d7c JW |
3629 | |
3630 | /* Skip any input that doesn't have an attribute section. | |
3631 | This enables to link object files without attribute section with | |
3632 | any others. */ | |
3633 | if (bfd_get_section_by_name (ibfd, sec_name) == NULL) | |
0a1b45a2 | 3634 | return true; |
7d7a7d7c JW |
3635 | |
3636 | if (!elf_known_obj_attributes_proc (obfd)[0].i) | |
3637 | { | |
3638 | /* This is the first object. Copy the attributes. */ | |
3639 | _bfd_elf_copy_obj_attributes (ibfd, obfd); | |
3640 | ||
3641 | out_attr = elf_known_obj_attributes_proc (obfd); | |
3642 | ||
3643 | /* Use the Tag_null value to indicate the attributes have been | |
3644 | initialized. */ | |
3645 | out_attr[0].i = 1; | |
3646 | ||
0a1b45a2 | 3647 | return true; |
7d7a7d7c JW |
3648 | } |
3649 | ||
3650 | in_attr = elf_known_obj_attributes_proc (ibfd); | |
3651 | out_attr = elf_known_obj_attributes_proc (obfd); | |
3652 | ||
3653 | for (i = LEAST_KNOWN_OBJ_ATTRIBUTE; i < NUM_KNOWN_OBJ_ATTRIBUTES; i++) | |
3654 | { | |
3655 | switch (i) | |
3656 | { | |
3657 | case Tag_RISCV_arch: | |
3658 | if (!out_attr[Tag_RISCV_arch].s) | |
3659 | out_attr[Tag_RISCV_arch].s = in_attr[Tag_RISCV_arch].s; | |
3660 | else if (in_attr[Tag_RISCV_arch].s | |
3661 | && out_attr[Tag_RISCV_arch].s) | |
3662 | { | |
dcd709e0 | 3663 | /* Check compatible. */ |
7d7a7d7c JW |
3664 | char *merged_arch = |
3665 | riscv_merge_arch_attr_info (ibfd, | |
3666 | in_attr[Tag_RISCV_arch].s, | |
3667 | out_attr[Tag_RISCV_arch].s); | |
3668 | if (merged_arch == NULL) | |
3669 | { | |
0a1b45a2 | 3670 | result = false; |
7d7a7d7c JW |
3671 | out_attr[Tag_RISCV_arch].s = ""; |
3672 | } | |
3673 | else | |
3674 | out_attr[Tag_RISCV_arch].s = merged_arch; | |
3675 | } | |
3676 | break; | |
41285764 | 3677 | |
7d7a7d7c JW |
3678 | case Tag_RISCV_priv_spec: |
3679 | case Tag_RISCV_priv_spec_minor: | |
3680 | case Tag_RISCV_priv_spec_revision: | |
dcd709e0 | 3681 | /* If we have handled the privileged elf attributes, then skip it. */ |
cbd7581f | 3682 | if (!priv_attrs_merged) |
41285764 | 3683 | { |
cbd7581f NC |
3684 | unsigned int Tag_a = Tag_RISCV_priv_spec; |
3685 | unsigned int Tag_b = Tag_RISCV_priv_spec_minor; | |
3686 | unsigned int Tag_c = Tag_RISCV_priv_spec_revision; | |
3d73d29e NC |
3687 | enum riscv_spec_class in_priv_spec = PRIV_SPEC_CLASS_NONE; |
3688 | enum riscv_spec_class out_priv_spec = PRIV_SPEC_CLASS_NONE; | |
39ff0b81 | 3689 | |
dcd709e0 | 3690 | /* Get the privileged spec class from elf attributes. */ |
39ff0b81 NC |
3691 | riscv_get_priv_spec_class_from_numbers (in_attr[Tag_a].i, |
3692 | in_attr[Tag_b].i, | |
3693 | in_attr[Tag_c].i, | |
3694 | &in_priv_spec); | |
3695 | riscv_get_priv_spec_class_from_numbers (out_attr[Tag_a].i, | |
3696 | out_attr[Tag_b].i, | |
3697 | out_attr[Tag_c].i, | |
3698 | &out_priv_spec); | |
cbd7581f | 3699 | |
dcd709e0 | 3700 | /* Allow to link the object without the privileged specs. */ |
39ff0b81 | 3701 | if (out_priv_spec == PRIV_SPEC_CLASS_NONE) |
cbd7581f NC |
3702 | { |
3703 | out_attr[Tag_a].i = in_attr[Tag_a].i; | |
3704 | out_attr[Tag_b].i = in_attr[Tag_b].i; | |
3705 | out_attr[Tag_c].i = in_attr[Tag_c].i; | |
3706 | } | |
39ff0b81 NC |
3707 | else if (in_priv_spec != PRIV_SPEC_CLASS_NONE |
3708 | && in_priv_spec != out_priv_spec) | |
cbd7581f NC |
3709 | { |
3710 | _bfd_error_handler | |
b800637e | 3711 | (_("warning: %pB use privileged spec version %u.%u.%u but " |
9184ef8a | 3712 | "the output use version %u.%u.%u"), |
cbd7581f NC |
3713 | ibfd, |
3714 | in_attr[Tag_a].i, | |
3715 | in_attr[Tag_b].i, | |
3716 | in_attr[Tag_c].i, | |
3717 | out_attr[Tag_a].i, | |
3718 | out_attr[Tag_b].i, | |
3719 | out_attr[Tag_c].i); | |
39ff0b81 | 3720 | |
dcd709e0 NC |
3721 | /* The privileged spec v1.9.1 can not be linked with others |
3722 | since the conflicts, so we plan to drop it in a year or | |
3723 | two. */ | |
39ff0b81 NC |
3724 | if (in_priv_spec == PRIV_SPEC_CLASS_1P9P1 |
3725 | || out_priv_spec == PRIV_SPEC_CLASS_1P9P1) | |
3726 | { | |
3727 | _bfd_error_handler | |
b800637e | 3728 | (_("warning: privileged spec version 1.9.1 can not be " |
9184ef8a | 3729 | "linked with other spec versions")); |
39ff0b81 NC |
3730 | } |
3731 | ||
dcd709e0 | 3732 | /* Update the output privileged spec to the newest one. */ |
39ff0b81 NC |
3733 | if (in_priv_spec > out_priv_spec) |
3734 | { | |
3735 | out_attr[Tag_a].i = in_attr[Tag_a].i; | |
3736 | out_attr[Tag_b].i = in_attr[Tag_b].i; | |
3737 | out_attr[Tag_c].i = in_attr[Tag_c].i; | |
3738 | } | |
cbd7581f | 3739 | } |
0a1b45a2 | 3740 | priv_attrs_merged = true; |
7d7a7d7c JW |
3741 | } |
3742 | break; | |
41285764 | 3743 | |
7d7a7d7c JW |
3744 | case Tag_RISCV_unaligned_access: |
3745 | out_attr[i].i |= in_attr[i].i; | |
3746 | break; | |
41285764 | 3747 | |
7d7a7d7c JW |
3748 | case Tag_RISCV_stack_align: |
3749 | if (out_attr[i].i == 0) | |
3750 | out_attr[i].i = in_attr[i].i; | |
3751 | else if (in_attr[i].i != 0 | |
3752 | && out_attr[i].i != 0 | |
3753 | && out_attr[i].i != in_attr[i].i) | |
3754 | { | |
3755 | _bfd_error_handler | |
3756 | (_("error: %pB use %u-byte stack aligned but the output " | |
9184ef8a | 3757 | "use %u-byte stack aligned"), |
7d7a7d7c | 3758 | ibfd, in_attr[i].i, out_attr[i].i); |
0a1b45a2 | 3759 | result = false; |
7d7a7d7c JW |
3760 | } |
3761 | break; | |
41285764 | 3762 | |
7d7a7d7c JW |
3763 | default: |
3764 | result &= _bfd_elf_merge_unknown_attribute_low (ibfd, obfd, i); | |
3765 | } | |
3766 | ||
3767 | /* If out_attr was copied from in_attr then it won't have a type yet. */ | |
3768 | if (in_attr[i].type && !out_attr[i].type) | |
3769 | out_attr[i].type = in_attr[i].type; | |
3770 | } | |
3771 | ||
3772 | /* Merge Tag_compatibility attributes and any common GNU ones. */ | |
3773 | if (!_bfd_elf_merge_object_attributes (ibfd, info)) | |
0a1b45a2 | 3774 | return false; |
7d7a7d7c JW |
3775 | |
3776 | /* Check for any attributes not known on RISC-V. */ | |
3777 | result &= _bfd_elf_merge_unknown_attribute_list (ibfd, obfd); | |
3778 | ||
3779 | return result; | |
3780 | } | |
3781 | ||
e23eba97 NC |
3782 | /* Merge backend specific data from an object file to the output |
3783 | object file when linking. */ | |
3784 | ||
0a1b45a2 | 3785 | static bool |
e23eba97 NC |
3786 | _bfd_riscv_elf_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info) |
3787 | { | |
3788 | bfd *obfd = info->output_bfd; | |
87f98bac | 3789 | flagword new_flags, old_flags; |
e23eba97 NC |
3790 | |
3791 | if (!is_riscv_elf (ibfd) || !is_riscv_elf (obfd)) | |
0a1b45a2 | 3792 | return true; |
e23eba97 NC |
3793 | |
3794 | if (strcmp (bfd_get_target (ibfd), bfd_get_target (obfd)) != 0) | |
3795 | { | |
3796 | (*_bfd_error_handler) | |
871b3ab2 | 3797 | (_("%pB: ABI is incompatible with that of the selected emulation:\n" |
96b0927d PD |
3798 | " target emulation `%s' does not match `%s'"), |
3799 | ibfd, bfd_get_target (ibfd), bfd_get_target (obfd)); | |
0a1b45a2 | 3800 | return false; |
e23eba97 NC |
3801 | } |
3802 | ||
3803 | if (!_bfd_elf_merge_object_attributes (ibfd, info)) | |
0a1b45a2 | 3804 | return false; |
e23eba97 | 3805 | |
7d7a7d7c | 3806 | if (!riscv_merge_attributes (ibfd, info)) |
0a1b45a2 | 3807 | return false; |
7d7a7d7c | 3808 | |
87f98bac JW |
3809 | /* Check to see if the input BFD actually contains any sections. If not, |
3810 | its flags may not have been initialized either, but it cannot actually | |
3811 | cause any incompatibility. Do not short-circuit dynamic objects; their | |
3812 | section list may be emptied by elf_link_add_object_symbols. | |
3813 | ||
3814 | Also check to see if there are no code sections in the input. In this | |
3815 | case, there is no need to check for code specific flags. */ | |
3816 | if (!(ibfd->flags & DYNAMIC)) | |
3817 | { | |
0a1b45a2 AM |
3818 | bool null_input_bfd = true; |
3819 | bool only_data_sections = true; | |
87f98bac JW |
3820 | asection *sec; |
3821 | ||
3822 | for (sec = ibfd->sections; sec != NULL; sec = sec->next) | |
3823 | { | |
0a1b45a2 | 3824 | null_input_bfd = false; |
0d6aab77 | 3825 | |
fd361982 | 3826 | if ((bfd_section_flags (sec) |
87f98bac JW |
3827 | & (SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS)) |
3828 | == (SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS)) | |
0d6aab77 | 3829 | { |
0a1b45a2 | 3830 | only_data_sections = false; |
0d6aab77 NC |
3831 | break; |
3832 | } | |
87f98bac JW |
3833 | } |
3834 | ||
3835 | if (null_input_bfd || only_data_sections) | |
0a1b45a2 | 3836 | return true; |
87f98bac JW |
3837 | } |
3838 | ||
0d6aab77 NC |
3839 | new_flags = elf_elfheader (ibfd)->e_flags; |
3840 | old_flags = elf_elfheader (obfd)->e_flags; | |
3841 | ||
3842 | if (!elf_flags_init (obfd)) | |
3843 | { | |
0a1b45a2 | 3844 | elf_flags_init (obfd) = true; |
0d6aab77 | 3845 | elf_elfheader (obfd)->e_flags = new_flags; |
0a1b45a2 | 3846 | return true; |
0d6aab77 NC |
3847 | } |
3848 | ||
2922d21d AW |
3849 | /* Disallow linking different float ABIs. */ |
3850 | if ((old_flags ^ new_flags) & EF_RISCV_FLOAT_ABI) | |
e23eba97 NC |
3851 | { |
3852 | (*_bfd_error_handler) | |
0242af40 JW |
3853 | (_("%pB: can't link %s modules with %s modules"), ibfd, |
3854 | riscv_float_abi_string (new_flags), | |
3855 | riscv_float_abi_string (old_flags)); | |
e23eba97 NC |
3856 | goto fail; |
3857 | } | |
3858 | ||
7f999549 JW |
3859 | /* Disallow linking RVE and non-RVE. */ |
3860 | if ((old_flags ^ new_flags) & EF_RISCV_RVE) | |
3861 | { | |
3862 | (*_bfd_error_handler) | |
3863 | (_("%pB: can't link RVE with other target"), ibfd); | |
3864 | goto fail; | |
3865 | } | |
3866 | ||
e23eba97 NC |
3867 | /* Allow linking RVC and non-RVC, and keep the RVC flag. */ |
3868 | elf_elfheader (obfd)->e_flags |= new_flags & EF_RISCV_RVC; | |
3869 | ||
0a1b45a2 | 3870 | return true; |
e23eba97 | 3871 | |
dc1e8a47 | 3872 | fail: |
e23eba97 | 3873 | bfd_set_error (bfd_error_bad_value); |
0a1b45a2 | 3874 | return false; |
e23eba97 NC |
3875 | } |
3876 | ||
3877 | /* Delete some bytes from a section while relaxing. */ | |
3878 | ||
0a1b45a2 | 3879 | static bool |
7f02625e JW |
3880 | riscv_relax_delete_bytes (bfd *abfd, asection *sec, bfd_vma addr, size_t count, |
3881 | struct bfd_link_info *link_info) | |
e23eba97 NC |
3882 | { |
3883 | unsigned int i, symcount; | |
3884 | bfd_vma toaddr = sec->size; | |
3885 | struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (abfd); | |
3886 | Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
3887 | unsigned int sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); | |
3888 | struct bfd_elf_section_data *data = elf_section_data (sec); | |
3889 | bfd_byte *contents = data->this_hdr.contents; | |
3890 | ||
3891 | /* Actually delete the bytes. */ | |
3892 | sec->size -= count; | |
3893 | memmove (contents + addr, contents + addr + count, toaddr - addr - count); | |
3894 | ||
3895 | /* Adjust the location of all of the relocs. Note that we need not | |
3896 | adjust the addends, since all PC-relative references must be against | |
3897 | symbols, which we will adjust below. */ | |
3898 | for (i = 0; i < sec->reloc_count; i++) | |
3899 | if (data->relocs[i].r_offset > addr && data->relocs[i].r_offset < toaddr) | |
3900 | data->relocs[i].r_offset -= count; | |
3901 | ||
3902 | /* Adjust the local symbols defined in this section. */ | |
3903 | for (i = 0; i < symtab_hdr->sh_info; i++) | |
3904 | { | |
3905 | Elf_Internal_Sym *sym = (Elf_Internal_Sym *) symtab_hdr->contents + i; | |
3906 | if (sym->st_shndx == sec_shndx) | |
3907 | { | |
3908 | /* If the symbol is in the range of memory we just moved, we | |
3909 | have to adjust its value. */ | |
3910 | if (sym->st_value > addr && sym->st_value <= toaddr) | |
3911 | sym->st_value -= count; | |
3912 | ||
3913 | /* If the symbol *spans* the bytes we just deleted (i.e. its | |
3914 | *end* is in the moved bytes but its *start* isn't), then we | |
788af978 JW |
3915 | must adjust its size. |
3916 | ||
3917 | This test needs to use the original value of st_value, otherwise | |
3918 | we might accidentally decrease size when deleting bytes right | |
3919 | before the symbol. But since deleted relocs can't span across | |
3920 | symbols, we can't have both a st_value and a st_size decrease, | |
3921 | so it is simpler to just use an else. */ | |
3922 | else if (sym->st_value <= addr | |
3923 | && sym->st_value + sym->st_size > addr | |
3924 | && sym->st_value + sym->st_size <= toaddr) | |
e23eba97 NC |
3925 | sym->st_size -= count; |
3926 | } | |
3927 | } | |
3928 | ||
3929 | /* Now adjust the global symbols defined in this section. */ | |
3930 | symcount = ((symtab_hdr->sh_size / sizeof (ElfNN_External_Sym)) | |
3931 | - symtab_hdr->sh_info); | |
3932 | ||
3933 | for (i = 0; i < symcount; i++) | |
3934 | { | |
3935 | struct elf_link_hash_entry *sym_hash = sym_hashes[i]; | |
3936 | ||
7f02625e JW |
3937 | /* The '--wrap SYMBOL' option is causing a pain when the object file, |
3938 | containing the definition of __wrap_SYMBOL, includes a direct | |
3939 | call to SYMBOL as well. Since both __wrap_SYMBOL and SYMBOL reference | |
3940 | the same symbol (which is __wrap_SYMBOL), but still exist as two | |
3941 | different symbols in 'sym_hashes', we don't want to adjust | |
dcd709e0 NC |
3942 | the global symbol __wrap_SYMBOL twice. |
3943 | ||
4bb5732e | 3944 | The same problem occurs with symbols that are versioned_hidden, as |
137b5cbd JW |
3945 | foo becomes an alias for foo@BAR, and hence they need the same |
3946 | treatment. */ | |
3947 | if (link_info->wrap_hash != NULL | |
3948 | || sym_hash->versioned == versioned_hidden) | |
7f02625e JW |
3949 | { |
3950 | struct elf_link_hash_entry **cur_sym_hashes; | |
3951 | ||
3952 | /* Loop only over the symbols which have already been checked. */ | |
3953 | for (cur_sym_hashes = sym_hashes; cur_sym_hashes < &sym_hashes[i]; | |
3954 | cur_sym_hashes++) | |
3955 | { | |
3956 | /* If the current symbol is identical to 'sym_hash', that means | |
3957 | the symbol was already adjusted (or at least checked). */ | |
3958 | if (*cur_sym_hashes == sym_hash) | |
3959 | break; | |
3960 | } | |
3961 | /* Don't adjust the symbol again. */ | |
3962 | if (cur_sym_hashes < &sym_hashes[i]) | |
3963 | continue; | |
3964 | } | |
3965 | ||
e23eba97 NC |
3966 | if ((sym_hash->root.type == bfd_link_hash_defined |
3967 | || sym_hash->root.type == bfd_link_hash_defweak) | |
3968 | && sym_hash->root.u.def.section == sec) | |
3969 | { | |
3970 | /* As above, adjust the value if needed. */ | |
3971 | if (sym_hash->root.u.def.value > addr | |
3972 | && sym_hash->root.u.def.value <= toaddr) | |
3973 | sym_hash->root.u.def.value -= count; | |
3974 | ||
3975 | /* As above, adjust the size if needed. */ | |
788af978 JW |
3976 | else if (sym_hash->root.u.def.value <= addr |
3977 | && sym_hash->root.u.def.value + sym_hash->size > addr | |
3978 | && sym_hash->root.u.def.value + sym_hash->size <= toaddr) | |
e23eba97 NC |
3979 | sym_hash->size -= count; |
3980 | } | |
3981 | } | |
3982 | ||
0a1b45a2 | 3983 | return true; |
e23eba97 NC |
3984 | } |
3985 | ||
9d06997a PD |
3986 | /* A second format for recording PC-relative hi relocations. This stores the |
3987 | information required to relax them to GP-relative addresses. */ | |
3988 | ||
3989 | typedef struct riscv_pcgp_hi_reloc riscv_pcgp_hi_reloc; | |
3990 | struct riscv_pcgp_hi_reloc | |
3991 | { | |
3992 | bfd_vma hi_sec_off; | |
3993 | bfd_vma hi_addend; | |
3994 | bfd_vma hi_addr; | |
3995 | unsigned hi_sym; | |
3996 | asection *sym_sec; | |
0a1b45a2 | 3997 | bool undefined_weak; |
9d06997a PD |
3998 | riscv_pcgp_hi_reloc *next; |
3999 | }; | |
4000 | ||
4001 | typedef struct riscv_pcgp_lo_reloc riscv_pcgp_lo_reloc; | |
4002 | struct riscv_pcgp_lo_reloc | |
4003 | { | |
4004 | bfd_vma hi_sec_off; | |
4005 | riscv_pcgp_lo_reloc *next; | |
4006 | }; | |
4007 | ||
4008 | typedef struct | |
4009 | { | |
4010 | riscv_pcgp_hi_reloc *hi; | |
4011 | riscv_pcgp_lo_reloc *lo; | |
4012 | } riscv_pcgp_relocs; | |
4013 | ||
5f9aecea JW |
4014 | /* Initialize the pcgp reloc info in P. */ |
4015 | ||
0a1b45a2 | 4016 | static bool |
9d06997a PD |
4017 | riscv_init_pcgp_relocs (riscv_pcgp_relocs *p) |
4018 | { | |
4019 | p->hi = NULL; | |
4020 | p->lo = NULL; | |
0a1b45a2 | 4021 | return true; |
9d06997a PD |
4022 | } |
4023 | ||
5f9aecea JW |
4024 | /* Free the pcgp reloc info in P. */ |
4025 | ||
9d06997a PD |
4026 | static void |
4027 | riscv_free_pcgp_relocs (riscv_pcgp_relocs *p, | |
4028 | bfd *abfd ATTRIBUTE_UNUSED, | |
4029 | asection *sec ATTRIBUTE_UNUSED) | |
4030 | { | |
4031 | riscv_pcgp_hi_reloc *c; | |
4032 | riscv_pcgp_lo_reloc *l; | |
4033 | ||
1942a048 | 4034 | for (c = p->hi; c != NULL; ) |
9d06997a PD |
4035 | { |
4036 | riscv_pcgp_hi_reloc *next = c->next; | |
4037 | free (c); | |
4038 | c = next; | |
4039 | } | |
4040 | ||
1942a048 | 4041 | for (l = p->lo; l != NULL; ) |
9d06997a PD |
4042 | { |
4043 | riscv_pcgp_lo_reloc *next = l->next; | |
4044 | free (l); | |
4045 | l = next; | |
4046 | } | |
4047 | } | |
4048 | ||
5f9aecea JW |
4049 | /* Record pcgp hi part reloc info in P, using HI_SEC_OFF as the lookup index. |
4050 | The HI_ADDEND, HI_ADDR, HI_SYM, and SYM_SEC args contain info required to | |
4051 | relax the corresponding lo part reloc. */ | |
4052 | ||
0a1b45a2 | 4053 | static bool |
9d06997a PD |
4054 | riscv_record_pcgp_hi_reloc (riscv_pcgp_relocs *p, bfd_vma hi_sec_off, |
4055 | bfd_vma hi_addend, bfd_vma hi_addr, | |
9d1da81b | 4056 | unsigned hi_sym, asection *sym_sec, |
0a1b45a2 | 4057 | bool undefined_weak) |
9d06997a | 4058 | { |
1942a048 | 4059 | riscv_pcgp_hi_reloc *new = bfd_malloc (sizeof (*new)); |
9d06997a | 4060 | if (!new) |
0a1b45a2 | 4061 | return false; |
9d06997a PD |
4062 | new->hi_sec_off = hi_sec_off; |
4063 | new->hi_addend = hi_addend; | |
4064 | new->hi_addr = hi_addr; | |
4065 | new->hi_sym = hi_sym; | |
4066 | new->sym_sec = sym_sec; | |
9d1da81b | 4067 | new->undefined_weak = undefined_weak; |
9d06997a PD |
4068 | new->next = p->hi; |
4069 | p->hi = new; | |
0a1b45a2 | 4070 | return true; |
9d06997a PD |
4071 | } |
4072 | ||
5f9aecea JW |
4073 | /* Look up hi part pcgp reloc info in P, using HI_SEC_OFF as the lookup index. |
4074 | This is used by a lo part reloc to find the corresponding hi part reloc. */ | |
4075 | ||
9d06997a | 4076 | static riscv_pcgp_hi_reloc * |
1942a048 | 4077 | riscv_find_pcgp_hi_reloc (riscv_pcgp_relocs *p, bfd_vma hi_sec_off) |
9d06997a PD |
4078 | { |
4079 | riscv_pcgp_hi_reloc *c; | |
4080 | ||
4081 | for (c = p->hi; c != NULL; c = c->next) | |
4082 | if (c->hi_sec_off == hi_sec_off) | |
4083 | return c; | |
4084 | return NULL; | |
4085 | } | |
4086 | ||
5f9aecea JW |
4087 | /* Record pcgp lo part reloc info in P, using HI_SEC_OFF as the lookup info. |
4088 | This is used to record relocs that can't be relaxed. */ | |
9d06997a | 4089 | |
0a1b45a2 | 4090 | static bool |
9d06997a PD |
4091 | riscv_record_pcgp_lo_reloc (riscv_pcgp_relocs *p, bfd_vma hi_sec_off) |
4092 | { | |
1942a048 | 4093 | riscv_pcgp_lo_reloc *new = bfd_malloc (sizeof (*new)); |
9d06997a | 4094 | if (!new) |
0a1b45a2 | 4095 | return false; |
9d06997a PD |
4096 | new->hi_sec_off = hi_sec_off; |
4097 | new->next = p->lo; | |
4098 | p->lo = new; | |
0a1b45a2 | 4099 | return true; |
9d06997a PD |
4100 | } |
4101 | ||
5f9aecea JW |
4102 | /* Look up lo part pcgp reloc info in P, using HI_SEC_OFF as the lookup index. |
4103 | This is used by a hi part reloc to find the corresponding lo part reloc. */ | |
4104 | ||
0a1b45a2 | 4105 | static bool |
9d06997a PD |
4106 | riscv_find_pcgp_lo_reloc (riscv_pcgp_relocs *p, bfd_vma hi_sec_off) |
4107 | { | |
4108 | riscv_pcgp_lo_reloc *c; | |
4109 | ||
4110 | for (c = p->lo; c != NULL; c = c->next) | |
4111 | if (c->hi_sec_off == hi_sec_off) | |
0a1b45a2 AM |
4112 | return true; |
4113 | return false; | |
9d06997a PD |
4114 | } |
4115 | ||
0a1b45a2 AM |
4116 | typedef bool (*relax_func_t) (bfd *, asection *, asection *, |
4117 | struct bfd_link_info *, | |
4118 | Elf_Internal_Rela *, | |
4119 | bfd_vma, bfd_vma, bfd_vma, bool *, | |
4120 | riscv_pcgp_relocs *, | |
4121 | bool undefined_weak); | |
45f76423 | 4122 | |
e23eba97 NC |
4123 | /* Relax AUIPC + JALR into JAL. */ |
4124 | ||
0a1b45a2 | 4125 | static bool |
e23eba97 NC |
4126 | _bfd_riscv_relax_call (bfd *abfd, asection *sec, asection *sym_sec, |
4127 | struct bfd_link_info *link_info, | |
4128 | Elf_Internal_Rela *rel, | |
4129 | bfd_vma symval, | |
45f76423 AW |
4130 | bfd_vma max_alignment, |
4131 | bfd_vma reserve_size ATTRIBUTE_UNUSED, | |
0a1b45a2 | 4132 | bool *again, |
9d1da81b | 4133 | riscv_pcgp_relocs *pcgp_relocs ATTRIBUTE_UNUSED, |
0a1b45a2 | 4134 | bool undefined_weak ATTRIBUTE_UNUSED) |
e23eba97 NC |
4135 | { |
4136 | bfd_byte *contents = elf_section_data (sec)->this_hdr.contents; | |
1174d920 | 4137 | bfd_vma foff = symval - (sec_addr (sec) + rel->r_offset); |
0a1b45a2 | 4138 | bool near_zero = (symval + RISCV_IMM_REACH / 2) < RISCV_IMM_REACH; |
e23eba97 NC |
4139 | bfd_vma auipc, jalr; |
4140 | int rd, r_type, len = 4, rvc = elf_elfheader (abfd)->e_flags & EF_RISCV_RVC; | |
4141 | ||
4142 | /* If the call crosses section boundaries, an alignment directive could | |
c6261a00 JW |
4143 | cause the PC-relative offset to later increase, so we need to add in the |
4144 | max alignment of any section inclusive from the call to the target. | |
4145 | Otherwise, we only need to use the alignment of the current section. */ | |
5a9f5403 | 4146 | if (VALID_JTYPE_IMM (foff)) |
c6261a00 JW |
4147 | { |
4148 | if (sym_sec->output_section == sec->output_section | |
4149 | && sym_sec->output_section != bfd_abs_section_ptr) | |
4150 | max_alignment = (bfd_vma) 1 << sym_sec->output_section->alignment_power; | |
1174d920 | 4151 | foff += ((bfd_signed_vma) foff < 0 ? -max_alignment : max_alignment); |
c6261a00 | 4152 | } |
e23eba97 NC |
4153 | |
4154 | /* See if this function call can be shortened. */ | |
5a9f5403 | 4155 | if (!VALID_JTYPE_IMM (foff) && !(!bfd_link_pic (link_info) && near_zero)) |
0a1b45a2 | 4156 | return true; |
e23eba97 NC |
4157 | |
4158 | /* Shorten the function call. */ | |
4159 | BFD_ASSERT (rel->r_offset + 8 <= sec->size); | |
4160 | ||
fbc09e7a MC |
4161 | auipc = bfd_getl32 (contents + rel->r_offset); |
4162 | jalr = bfd_getl32 (contents + rel->r_offset + 4); | |
e23eba97 | 4163 | rd = (jalr >> OP_SH_RD) & OP_MASK_RD; |
5a9f5403 | 4164 | rvc = rvc && VALID_CJTYPE_IMM (foff); |
e23eba97 | 4165 | |
ae2b14c7 JW |
4166 | /* C.J exists on RV32 and RV64, but C.JAL is RV32-only. */ |
4167 | rvc = rvc && (rd == 0 || (rd == X_RA && ARCH_SIZE == 32)); | |
4168 | ||
4169 | if (rvc) | |
e23eba97 NC |
4170 | { |
4171 | /* Relax to C.J[AL] rd, addr. */ | |
4172 | r_type = R_RISCV_RVC_JUMP; | |
4173 | auipc = rd == 0 ? MATCH_C_J : MATCH_C_JAL; | |
4174 | len = 2; | |
4175 | } | |
5a9f5403 | 4176 | else if (VALID_JTYPE_IMM (foff)) |
e23eba97 NC |
4177 | { |
4178 | /* Relax to JAL rd, addr. */ | |
4179 | r_type = R_RISCV_JAL; | |
4180 | auipc = MATCH_JAL | (rd << OP_SH_RD); | |
4181 | } | |
dcd709e0 | 4182 | else |
e23eba97 | 4183 | { |
dcd709e0 | 4184 | /* Near zero, relax to JALR rd, x0, addr. */ |
e23eba97 NC |
4185 | r_type = R_RISCV_LO12_I; |
4186 | auipc = MATCH_JALR | (rd << OP_SH_RD); | |
4187 | } | |
4188 | ||
4189 | /* Replace the R_RISCV_CALL reloc. */ | |
4190 | rel->r_info = ELFNN_R_INFO (ELFNN_R_SYM (rel->r_info), r_type); | |
4191 | /* Replace the AUIPC. */ | |
fbc09e7a | 4192 | riscv_put_insn (8 * len, auipc, contents + rel->r_offset); |
e23eba97 NC |
4193 | |
4194 | /* Delete unnecessary JALR. */ | |
0a1b45a2 | 4195 | *again = true; |
7f02625e JW |
4196 | return riscv_relax_delete_bytes (abfd, sec, rel->r_offset + len, 8 - len, |
4197 | link_info); | |
e23eba97 NC |
4198 | } |
4199 | ||
4200 | /* Traverse all output sections and return the max alignment. */ | |
4201 | ||
1d61f794 | 4202 | static bfd_vma |
e23eba97 NC |
4203 | _bfd_riscv_get_max_alignment (asection *sec) |
4204 | { | |
4205 | unsigned int max_alignment_power = 0; | |
4206 | asection *o; | |
4207 | ||
4208 | for (o = sec->output_section->owner->sections; o != NULL; o = o->next) | |
4209 | { | |
4210 | if (o->alignment_power > max_alignment_power) | |
4211 | max_alignment_power = o->alignment_power; | |
4212 | } | |
4213 | ||
1d61f794 | 4214 | return (bfd_vma) 1 << max_alignment_power; |
e23eba97 NC |
4215 | } |
4216 | ||
dcd709e0 | 4217 | /* Relax non-PIC global variable references to GP-relative references. */ |
e23eba97 | 4218 | |
0a1b45a2 | 4219 | static bool |
e23eba97 NC |
4220 | _bfd_riscv_relax_lui (bfd *abfd, |
4221 | asection *sec, | |
4222 | asection *sym_sec, | |
4223 | struct bfd_link_info *link_info, | |
4224 | Elf_Internal_Rela *rel, | |
4225 | bfd_vma symval, | |
45f76423 AW |
4226 | bfd_vma max_alignment, |
4227 | bfd_vma reserve_size, | |
0a1b45a2 | 4228 | bool *again, |
9d1da81b | 4229 | riscv_pcgp_relocs *pcgp_relocs ATTRIBUTE_UNUSED, |
0a1b45a2 | 4230 | bool undefined_weak) |
e23eba97 NC |
4231 | { |
4232 | bfd_byte *contents = elf_section_data (sec)->this_hdr.contents; | |
4233 | bfd_vma gp = riscv_global_pointer_value (link_info); | |
4234 | int use_rvc = elf_elfheader (abfd)->e_flags & EF_RISCV_RVC; | |
4235 | ||
e23eba97 NC |
4236 | BFD_ASSERT (rel->r_offset + 4 <= sec->size); |
4237 | ||
d0f744f9 AW |
4238 | if (gp) |
4239 | { | |
507685a3 JW |
4240 | /* If gp and the symbol are in the same output section, which is not the |
4241 | abs section, then consider only that output section's alignment. */ | |
d0f744f9 | 4242 | struct bfd_link_hash_entry *h = |
0a1b45a2 AM |
4243 | bfd_link_hash_lookup (link_info->hash, RISCV_GP_SYMBOL, false, false, |
4244 | true); | |
507685a3 JW |
4245 | if (h->u.def.section->output_section == sym_sec->output_section |
4246 | && sym_sec->output_section != bfd_abs_section_ptr) | |
d0f744f9 AW |
4247 | max_alignment = (bfd_vma) 1 << sym_sec->output_section->alignment_power; |
4248 | } | |
4249 | ||
e23eba97 NC |
4250 | /* Is the reference in range of x0 or gp? |
4251 | Valid gp range conservatively because of alignment issue. */ | |
9d1da81b JW |
4252 | if (undefined_weak |
4253 | || (VALID_ITYPE_IMM (symval) | |
4254 | || (symval >= gp | |
4255 | && VALID_ITYPE_IMM (symval - gp + max_alignment + reserve_size)) | |
4256 | || (symval < gp | |
4257 | && VALID_ITYPE_IMM (symval - gp - max_alignment - reserve_size)))) | |
e23eba97 NC |
4258 | { |
4259 | unsigned sym = ELFNN_R_SYM (rel->r_info); | |
4260 | switch (ELFNN_R_TYPE (rel->r_info)) | |
4261 | { | |
4262 | case R_RISCV_LO12_I: | |
9d1da81b JW |
4263 | if (undefined_weak) |
4264 | { | |
4265 | /* Change the RS1 to zero. */ | |
fbc09e7a | 4266 | bfd_vma insn = bfd_getl32 (contents + rel->r_offset); |
9d1da81b | 4267 | insn &= ~(OP_MASK_RS1 << OP_SH_RS1); |
fbc09e7a | 4268 | bfd_putl32 (insn, contents + rel->r_offset); |
9d1da81b JW |
4269 | } |
4270 | else | |
4271 | rel->r_info = ELFNN_R_INFO (sym, R_RISCV_GPREL_I); | |
0a1b45a2 | 4272 | return true; |
e23eba97 NC |
4273 | |
4274 | case R_RISCV_LO12_S: | |
9d1da81b JW |
4275 | if (undefined_weak) |
4276 | { | |
4277 | /* Change the RS1 to zero. */ | |
fbc09e7a | 4278 | bfd_vma insn = bfd_getl32 (contents + rel->r_offset); |
9d1da81b | 4279 | insn &= ~(OP_MASK_RS1 << OP_SH_RS1); |
fbc09e7a | 4280 | bfd_putl32 (insn, contents + rel->r_offset); |
9d1da81b JW |
4281 | } |
4282 | else | |
4283 | rel->r_info = ELFNN_R_INFO (sym, R_RISCV_GPREL_S); | |
0a1b45a2 | 4284 | return true; |
e23eba97 NC |
4285 | |
4286 | case R_RISCV_HI20: | |
4287 | /* We can delete the unnecessary LUI and reloc. */ | |
4288 | rel->r_info = ELFNN_R_INFO (0, R_RISCV_NONE); | |
0a1b45a2 | 4289 | *again = true; |
7f02625e JW |
4290 | return riscv_relax_delete_bytes (abfd, sec, rel->r_offset, 4, |
4291 | link_info); | |
e23eba97 NC |
4292 | |
4293 | default: | |
4294 | abort (); | |
4295 | } | |
4296 | } | |
4297 | ||
4298 | /* Can we relax LUI to C.LUI? Alignment might move the section forward; | |
0f52d45a JW |
4299 | account for this assuming page alignment at worst. In the presence of |
4300 | RELRO segment the linker aligns it by one page size, therefore sections | |
4301 | after the segment can be moved more than one page. */ | |
4302 | ||
e23eba97 NC |
4303 | if (use_rvc |
4304 | && ELFNN_R_TYPE (rel->r_info) == R_RISCV_HI20 | |
5a9f5403 NC |
4305 | && VALID_CITYPE_LUI_IMM (RISCV_CONST_HIGH_PART (symval)) |
4306 | && VALID_CITYPE_LUI_IMM (RISCV_CONST_HIGH_PART (symval) | |
0f52d45a JW |
4307 | + (link_info->relro ? 2 * ELF_MAXPAGESIZE |
4308 | : ELF_MAXPAGESIZE))) | |
e23eba97 | 4309 | { |
3342be5d | 4310 | /* Replace LUI with C.LUI if legal (i.e., rd != x0 and rd != x2/sp). */ |
fbc09e7a | 4311 | bfd_vma lui = bfd_getl32 (contents + rel->r_offset); |
3342be5d AW |
4312 | unsigned rd = ((unsigned)lui >> OP_SH_RD) & OP_MASK_RD; |
4313 | if (rd == 0 || rd == X_SP) | |
0a1b45a2 | 4314 | return true; |
e23eba97 NC |
4315 | |
4316 | lui = (lui & (OP_MASK_RD << OP_SH_RD)) | MATCH_C_LUI; | |
fbc09e7a | 4317 | bfd_putl32 (lui, contents + rel->r_offset); |
e23eba97 NC |
4318 | |
4319 | /* Replace the R_RISCV_HI20 reloc. */ | |
4320 | rel->r_info = ELFNN_R_INFO (ELFNN_R_SYM (rel->r_info), R_RISCV_RVC_LUI); | |
4321 | ||
0a1b45a2 | 4322 | *again = true; |
7f02625e JW |
4323 | return riscv_relax_delete_bytes (abfd, sec, rel->r_offset + 2, 2, |
4324 | link_info); | |
e23eba97 NC |
4325 | } |
4326 | ||
0a1b45a2 | 4327 | return true; |
e23eba97 NC |
4328 | } |
4329 | ||
dcd709e0 | 4330 | /* Relax non-PIC TLS references to TP-relative references. */ |
e23eba97 | 4331 | |
0a1b45a2 | 4332 | static bool |
e23eba97 NC |
4333 | _bfd_riscv_relax_tls_le (bfd *abfd, |
4334 | asection *sec, | |
4335 | asection *sym_sec ATTRIBUTE_UNUSED, | |
4336 | struct bfd_link_info *link_info, | |
4337 | Elf_Internal_Rela *rel, | |
4338 | bfd_vma symval, | |
45f76423 AW |
4339 | bfd_vma max_alignment ATTRIBUTE_UNUSED, |
4340 | bfd_vma reserve_size ATTRIBUTE_UNUSED, | |
0a1b45a2 | 4341 | bool *again, |
9d1da81b | 4342 | riscv_pcgp_relocs *prcel_relocs ATTRIBUTE_UNUSED, |
0a1b45a2 | 4343 | bool undefined_weak ATTRIBUTE_UNUSED) |
e23eba97 NC |
4344 | { |
4345 | /* See if this symbol is in range of tp. */ | |
4346 | if (RISCV_CONST_HIGH_PART (tpoff (link_info, symval)) != 0) | |
0a1b45a2 | 4347 | return true; |
e23eba97 | 4348 | |
e23eba97 | 4349 | BFD_ASSERT (rel->r_offset + 4 <= sec->size); |
45f76423 AW |
4350 | switch (ELFNN_R_TYPE (rel->r_info)) |
4351 | { | |
4352 | case R_RISCV_TPREL_LO12_I: | |
4353 | rel->r_info = ELFNN_R_INFO (ELFNN_R_SYM (rel->r_info), R_RISCV_TPREL_I); | |
0a1b45a2 | 4354 | return true; |
e23eba97 | 4355 | |
45f76423 AW |
4356 | case R_RISCV_TPREL_LO12_S: |
4357 | rel->r_info = ELFNN_R_INFO (ELFNN_R_SYM (rel->r_info), R_RISCV_TPREL_S); | |
0a1b45a2 | 4358 | return true; |
45f76423 AW |
4359 | |
4360 | case R_RISCV_TPREL_HI20: | |
4361 | case R_RISCV_TPREL_ADD: | |
4362 | /* We can delete the unnecessary instruction and reloc. */ | |
4363 | rel->r_info = ELFNN_R_INFO (0, R_RISCV_NONE); | |
0a1b45a2 | 4364 | *again = true; |
7f02625e | 4365 | return riscv_relax_delete_bytes (abfd, sec, rel->r_offset, 4, link_info); |
45f76423 AW |
4366 | |
4367 | default: | |
4368 | abort (); | |
4369 | } | |
e23eba97 NC |
4370 | } |
4371 | ||
ebdcad3f NC |
4372 | /* Implement R_RISCV_ALIGN by deleting excess alignment NOPs. |
4373 | Once we've handled an R_RISCV_ALIGN, we can't relax anything else. */ | |
e23eba97 | 4374 | |
0a1b45a2 | 4375 | static bool |
e23eba97 | 4376 | _bfd_riscv_relax_align (bfd *abfd, asection *sec, |
9eb7b0ac | 4377 | asection *sym_sec, |
7f02625e | 4378 | struct bfd_link_info *link_info, |
e23eba97 NC |
4379 | Elf_Internal_Rela *rel, |
4380 | bfd_vma symval, | |
45f76423 AW |
4381 | bfd_vma max_alignment ATTRIBUTE_UNUSED, |
4382 | bfd_vma reserve_size ATTRIBUTE_UNUSED, | |
0a1b45a2 | 4383 | bool *again ATTRIBUTE_UNUSED, |
9d1da81b | 4384 | riscv_pcgp_relocs *pcrel_relocs ATTRIBUTE_UNUSED, |
0a1b45a2 | 4385 | bool undefined_weak ATTRIBUTE_UNUSED) |
e23eba97 NC |
4386 | { |
4387 | bfd_byte *contents = elf_section_data (sec)->this_hdr.contents; | |
4388 | bfd_vma alignment = 1, pos; | |
4389 | while (alignment <= rel->r_addend) | |
4390 | alignment *= 2; | |
4391 | ||
4392 | symval -= rel->r_addend; | |
4393 | bfd_vma aligned_addr = ((symval - 1) & ~(alignment - 1)) + alignment; | |
4394 | bfd_vma nop_bytes = aligned_addr - symval; | |
4395 | ||
e23eba97 NC |
4396 | /* Make sure there are enough NOPs to actually achieve the alignment. */ |
4397 | if (rel->r_addend < nop_bytes) | |
9eb7b0ac | 4398 | { |
f2b740ac AM |
4399 | _bfd_error_handler |
4400 | (_("%pB(%pA+%#" PRIx64 "): %" PRId64 " bytes required for alignment " | |
4401 | "to %" PRId64 "-byte boundary, but only %" PRId64 " present"), | |
4402 | abfd, sym_sec, (uint64_t) rel->r_offset, | |
4403 | (int64_t) nop_bytes, (int64_t) alignment, (int64_t) rel->r_addend); | |
9eb7b0ac | 4404 | bfd_set_error (bfd_error_bad_value); |
0a1b45a2 | 4405 | return false; |
9eb7b0ac | 4406 | } |
e23eba97 NC |
4407 | |
4408 | /* Delete the reloc. */ | |
4409 | rel->r_info = ELFNN_R_INFO (0, R_RISCV_NONE); | |
4410 | ||
4411 | /* If the number of NOPs is already correct, there's nothing to do. */ | |
4412 | if (nop_bytes == rel->r_addend) | |
0a1b45a2 | 4413 | return true; |
e23eba97 NC |
4414 | |
4415 | /* Write as many RISC-V NOPs as we need. */ | |
4416 | for (pos = 0; pos < (nop_bytes & -4); pos += 4) | |
fbc09e7a | 4417 | bfd_putl32 (RISCV_NOP, contents + rel->r_offset + pos); |
e23eba97 NC |
4418 | |
4419 | /* Write a final RVC NOP if need be. */ | |
4420 | if (nop_bytes % 4 != 0) | |
fbc09e7a | 4421 | bfd_putl16 (RVC_NOP, contents + rel->r_offset + pos); |
e23eba97 NC |
4422 | |
4423 | /* Delete the excess bytes. */ | |
4424 | return riscv_relax_delete_bytes (abfd, sec, rel->r_offset + nop_bytes, | |
7f02625e | 4425 | rel->r_addend - nop_bytes, link_info); |
e23eba97 NC |
4426 | } |
4427 | ||
ff6f4d9b PD |
4428 | /* Relax PC-relative references to GP-relative references. */ |
4429 | ||
0a1b45a2 | 4430 | static bool |
1942a048 NC |
4431 | _bfd_riscv_relax_pc (bfd *abfd ATTRIBUTE_UNUSED, |
4432 | asection *sec, | |
4433 | asection *sym_sec, | |
4434 | struct bfd_link_info *link_info, | |
4435 | Elf_Internal_Rela *rel, | |
4436 | bfd_vma symval, | |
4437 | bfd_vma max_alignment, | |
4438 | bfd_vma reserve_size, | |
0a1b45a2 | 4439 | bool *again ATTRIBUTE_UNUSED, |
1942a048 | 4440 | riscv_pcgp_relocs *pcgp_relocs, |
0a1b45a2 | 4441 | bool undefined_weak) |
9d06997a | 4442 | { |
9d1da81b | 4443 | bfd_byte *contents = elf_section_data (sec)->this_hdr.contents; |
9d06997a PD |
4444 | bfd_vma gp = riscv_global_pointer_value (link_info); |
4445 | ||
4446 | BFD_ASSERT (rel->r_offset + 4 <= sec->size); | |
4447 | ||
4448 | /* Chain the _LO relocs to their cooresponding _HI reloc to compute the | |
dcd709e0 | 4449 | actual target address. */ |
e65b1a78 MR |
4450 | riscv_pcgp_hi_reloc hi_reloc; |
4451 | memset (&hi_reloc, 0, sizeof (hi_reloc)); | |
9d06997a PD |
4452 | switch (ELFNN_R_TYPE (rel->r_info)) |
4453 | { | |
4454 | case R_RISCV_PCREL_LO12_I: | |
4455 | case R_RISCV_PCREL_LO12_S: | |
4456 | { | |
a05f27b6 JW |
4457 | /* If the %lo has an addend, it isn't for the label pointing at the |
4458 | hi part instruction, but rather for the symbol pointed at by the | |
4459 | hi part instruction. So we must subtract it here for the lookup. | |
4460 | It is still used below in the final symbol address. */ | |
4461 | bfd_vma hi_sec_off = symval - sec_addr (sym_sec) - rel->r_addend; | |
9d06997a | 4462 | riscv_pcgp_hi_reloc *hi = riscv_find_pcgp_hi_reloc (pcgp_relocs, |
a05f27b6 | 4463 | hi_sec_off); |
9d06997a PD |
4464 | if (hi == NULL) |
4465 | { | |
a05f27b6 | 4466 | riscv_record_pcgp_lo_reloc (pcgp_relocs, hi_sec_off); |
0a1b45a2 | 4467 | return true; |
9d06997a PD |
4468 | } |
4469 | ||
4470 | hi_reloc = *hi; | |
4471 | symval = hi_reloc.hi_addr; | |
4472 | sym_sec = hi_reloc.sym_sec; | |
9d1da81b JW |
4473 | |
4474 | /* We can not know whether the undefined weak symbol is referenced | |
4475 | according to the information of R_RISCV_PCREL_LO12_I/S. Therefore, | |
4476 | we have to record the 'undefined_weak' flag when handling the | |
4477 | corresponding R_RISCV_HI20 reloc in riscv_record_pcgp_hi_reloc. */ | |
4478 | undefined_weak = hi_reloc.undefined_weak; | |
9d06997a PD |
4479 | } |
4480 | break; | |
4481 | ||
4482 | case R_RISCV_PCREL_HI20: | |
4483 | /* Mergeable symbols and code might later move out of range. */ | |
9d1da81b JW |
4484 | if (! undefined_weak |
4485 | && sym_sec->flags & (SEC_MERGE | SEC_CODE)) | |
0a1b45a2 | 4486 | return true; |
9d06997a PD |
4487 | |
4488 | /* If the cooresponding lo relocation has already been seen then it's not | |
dcd709e0 | 4489 | safe to relax this relocation. */ |
9d06997a | 4490 | if (riscv_find_pcgp_lo_reloc (pcgp_relocs, rel->r_offset)) |
0a1b45a2 | 4491 | return true; |
9d06997a PD |
4492 | |
4493 | break; | |
4494 | ||
4495 | default: | |
4496 | abort (); | |
4497 | } | |
4498 | ||
4499 | if (gp) | |
4500 | { | |
507685a3 JW |
4501 | /* If gp and the symbol are in the same output section, which is not the |
4502 | abs section, then consider only that output section's alignment. */ | |
9d06997a | 4503 | struct bfd_link_hash_entry *h = |
0a1b45a2 AM |
4504 | bfd_link_hash_lookup (link_info->hash, RISCV_GP_SYMBOL, false, false, |
4505 | true); | |
507685a3 JW |
4506 | if (h->u.def.section->output_section == sym_sec->output_section |
4507 | && sym_sec->output_section != bfd_abs_section_ptr) | |
9d06997a PD |
4508 | max_alignment = (bfd_vma) 1 << sym_sec->output_section->alignment_power; |
4509 | } | |
4510 | ||
4511 | /* Is the reference in range of x0 or gp? | |
4512 | Valid gp range conservatively because of alignment issue. */ | |
9d1da81b JW |
4513 | if (undefined_weak |
4514 | || (VALID_ITYPE_IMM (symval) | |
4515 | || (symval >= gp | |
4516 | && VALID_ITYPE_IMM (symval - gp + max_alignment + reserve_size)) | |
4517 | || (symval < gp | |
4518 | && VALID_ITYPE_IMM (symval - gp - max_alignment - reserve_size)))) | |
9d06997a PD |
4519 | { |
4520 | unsigned sym = hi_reloc.hi_sym; | |
4521 | switch (ELFNN_R_TYPE (rel->r_info)) | |
4522 | { | |
4523 | case R_RISCV_PCREL_LO12_I: | |
9d1da81b JW |
4524 | if (undefined_weak) |
4525 | { | |
4526 | /* Change the RS1 to zero, and then modify the relocation | |
4527 | type to R_RISCV_LO12_I. */ | |
fbc09e7a | 4528 | bfd_vma insn = bfd_getl32 (contents + rel->r_offset); |
9d1da81b | 4529 | insn &= ~(OP_MASK_RS1 << OP_SH_RS1); |
fbc09e7a | 4530 | bfd_putl32 (insn, contents + rel->r_offset); |
9d1da81b JW |
4531 | rel->r_info = ELFNN_R_INFO (sym, R_RISCV_LO12_I); |
4532 | rel->r_addend = hi_reloc.hi_addend; | |
4533 | } | |
4534 | else | |
4535 | { | |
4536 | rel->r_info = ELFNN_R_INFO (sym, R_RISCV_GPREL_I); | |
4537 | rel->r_addend += hi_reloc.hi_addend; | |
4538 | } | |
0a1b45a2 | 4539 | return true; |
9d06997a PD |
4540 | |
4541 | case R_RISCV_PCREL_LO12_S: | |
9d1da81b JW |
4542 | if (undefined_weak) |
4543 | { | |
4544 | /* Change the RS1 to zero, and then modify the relocation | |
4545 | type to R_RISCV_LO12_S. */ | |
fbc09e7a | 4546 | bfd_vma insn = bfd_getl32 (contents + rel->r_offset); |
9d1da81b | 4547 | insn &= ~(OP_MASK_RS1 << OP_SH_RS1); |
fbc09e7a | 4548 | bfd_putl32 (insn, contents + rel->r_offset); |
9d1da81b JW |
4549 | rel->r_info = ELFNN_R_INFO (sym, R_RISCV_LO12_S); |
4550 | rel->r_addend = hi_reloc.hi_addend; | |
4551 | } | |
4552 | else | |
4553 | { | |
4554 | rel->r_info = ELFNN_R_INFO (sym, R_RISCV_GPREL_S); | |
4555 | rel->r_addend += hi_reloc.hi_addend; | |
4556 | } | |
0a1b45a2 | 4557 | return true; |
9d06997a PD |
4558 | |
4559 | case R_RISCV_PCREL_HI20: | |
07d6d2b8 | 4560 | riscv_record_pcgp_hi_reloc (pcgp_relocs, |
9d06997a PD |
4561 | rel->r_offset, |
4562 | rel->r_addend, | |
4563 | symval, | |
4564 | ELFNN_R_SYM(rel->r_info), | |
9d1da81b JW |
4565 | sym_sec, |
4566 | undefined_weak); | |
9d06997a PD |
4567 | /* We can delete the unnecessary AUIPC and reloc. */ |
4568 | rel->r_info = ELFNN_R_INFO (0, R_RISCV_DELETE); | |
4569 | rel->r_addend = 4; | |
0a1b45a2 | 4570 | return true; |
9d06997a PD |
4571 | |
4572 | default: | |
4573 | abort (); | |
4574 | } | |
4575 | } | |
4576 | ||
0a1b45a2 | 4577 | return true; |
9d06997a PD |
4578 | } |
4579 | ||
dcd709e0 | 4580 | /* Delete the bytes for R_RISCV_DELETE. */ |
9d06997a | 4581 | |
0a1b45a2 | 4582 | static bool |
ff6f4d9b PD |
4583 | _bfd_riscv_relax_delete (bfd *abfd, |
4584 | asection *sec, | |
4585 | asection *sym_sec ATTRIBUTE_UNUSED, | |
7f02625e | 4586 | struct bfd_link_info *link_info, |
ff6f4d9b PD |
4587 | Elf_Internal_Rela *rel, |
4588 | bfd_vma symval ATTRIBUTE_UNUSED, | |
4589 | bfd_vma max_alignment ATTRIBUTE_UNUSED, | |
4590 | bfd_vma reserve_size ATTRIBUTE_UNUSED, | |
0a1b45a2 | 4591 | bool *again, |
9d1da81b | 4592 | riscv_pcgp_relocs *pcgp_relocs ATTRIBUTE_UNUSED, |
0a1b45a2 | 4593 | bool undefined_weak ATTRIBUTE_UNUSED) |
ff6f4d9b | 4594 | { |
1942a048 NC |
4595 | if (!riscv_relax_delete_bytes (abfd, sec, rel->r_offset, rel->r_addend, |
4596 | link_info)) | |
0a1b45a2 | 4597 | return false; |
1942a048 | 4598 | rel->r_info = ELFNN_R_INFO (0, R_RISCV_NONE); |
0a1b45a2 AM |
4599 | *again = true; |
4600 | return true; | |
ff6f4d9b PD |
4601 | } |
4602 | ||
ebdcad3f NC |
4603 | /* Called by after_allocation to check if we need to run the whole |
4604 | relaxations again. */ | |
4605 | ||
0a1b45a2 | 4606 | bool |
ebdcad3f NC |
4607 | bfd_elfNN_riscv_restart_relax_sections (struct bfd_link_info *info) |
4608 | { | |
4609 | struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info); | |
0a1b45a2 | 4610 | bool restart = htab->restart_relax; |
ebdcad3f | 4611 | /* Reset the flag. */ |
0a1b45a2 | 4612 | htab->restart_relax = false; |
ebdcad3f NC |
4613 | return restart; |
4614 | } | |
4615 | ||
dcd709e0 NC |
4616 | /* Relax a section. |
4617 | ||
4618 | Pass 0: Shortens code sequences for LUI/CALL/TPREL relocs. | |
4619 | Pass 1: Shortens code sequences for PCREL relocs. | |
ebdcad3f NC |
4620 | Pass 2: Deletes the bytes that pass 1 made obsolete. |
4621 | Pass 3: Which cannot be disabled, handles code alignment directives. | |
4622 | ||
4623 | The `again` is used to determine whether the relax pass itself needs to | |
4624 | run again. And the `restart_relax` is used to determine if we need to | |
4625 | run the whole relax passes again from 0 to 2. Once we have deleted the | |
4626 | code between relax pass 0 to 2, the restart_relax will be set to TRUE, | |
4627 | and we should run the whole relaxations again to give them more chances | |
4628 | to shorten the code. | |
4629 | ||
4630 | Since we can't relax anything else once we start to handle the alignments, | |
4631 | we will only enter into the relax pass 3 when the restart_relax is FALSE. */ | |
e23eba97 | 4632 | |
0a1b45a2 | 4633 | static bool |
e23eba97 NC |
4634 | _bfd_riscv_relax_section (bfd *abfd, asection *sec, |
4635 | struct bfd_link_info *info, | |
0a1b45a2 | 4636 | bool *again) |
e23eba97 NC |
4637 | { |
4638 | Elf_Internal_Shdr *symtab_hdr = &elf_symtab_hdr (abfd); | |
4639 | struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info); | |
4640 | struct bfd_elf_section_data *data = elf_section_data (sec); | |
4641 | Elf_Internal_Rela *relocs; | |
0a1b45a2 | 4642 | bool ret = false; |
e23eba97 | 4643 | unsigned int i; |
45f76423 | 4644 | bfd_vma max_alignment, reserve_size = 0; |
9d06997a | 4645 | riscv_pcgp_relocs pcgp_relocs; |
e23eba97 | 4646 | |
0a1b45a2 | 4647 | *again = false; |
e23eba97 NC |
4648 | |
4649 | if (bfd_link_relocatable (info) | |
e23eba97 NC |
4650 | || (sec->flags & SEC_RELOC) == 0 |
4651 | || sec->reloc_count == 0 | |
4652 | || (info->disable_target_specific_optimizations | |
ebdcad3f NC |
4653 | && info->relax_pass < 2) |
4654 | || (htab->restart_relax | |
4655 | && info->relax_pass == 3)) | |
0a1b45a2 | 4656 | return true; |
e23eba97 | 4657 | |
9d06997a PD |
4658 | riscv_init_pcgp_relocs (&pcgp_relocs); |
4659 | ||
e23eba97 NC |
4660 | /* Read this BFD's relocs if we haven't done so already. */ |
4661 | if (data->relocs) | |
4662 | relocs = data->relocs; | |
4663 | else if (!(relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, | |
4664 | info->keep_memory))) | |
4665 | goto fail; | |
4666 | ||
fc3c5343 L |
4667 | if (htab) |
4668 | { | |
4669 | max_alignment = htab->max_alignment; | |
4670 | if (max_alignment == (bfd_vma) -1) | |
4671 | { | |
4672 | max_alignment = _bfd_riscv_get_max_alignment (sec); | |
4673 | htab->max_alignment = max_alignment; | |
4674 | } | |
4675 | } | |
4676 | else | |
4677 | max_alignment = _bfd_riscv_get_max_alignment (sec); | |
e23eba97 NC |
4678 | |
4679 | /* Examine and consider relaxing each reloc. */ | |
4680 | for (i = 0; i < sec->reloc_count; i++) | |
4681 | { | |
4682 | asection *sym_sec; | |
4683 | Elf_Internal_Rela *rel = relocs + i; | |
45f76423 | 4684 | relax_func_t relax_func; |
e23eba97 NC |
4685 | int type = ELFNN_R_TYPE (rel->r_info); |
4686 | bfd_vma symval; | |
04b865dc | 4687 | char symtype; |
0a1b45a2 | 4688 | bool undefined_weak = false; |
e23eba97 | 4689 | |
ff6f4d9b | 4690 | relax_func = NULL; |
e23eba97 NC |
4691 | if (info->relax_pass == 0) |
4692 | { | |
abd20cb6 NC |
4693 | if (type == R_RISCV_CALL |
4694 | || type == R_RISCV_CALL_PLT) | |
e23eba97 NC |
4695 | relax_func = _bfd_riscv_relax_call; |
4696 | else if (type == R_RISCV_HI20 | |
4697 | || type == R_RISCV_LO12_I | |
4698 | || type == R_RISCV_LO12_S) | |
4699 | relax_func = _bfd_riscv_relax_lui; | |
45f76423 AW |
4700 | else if (type == R_RISCV_TPREL_HI20 |
4701 | || type == R_RISCV_TPREL_ADD | |
4702 | || type == R_RISCV_TPREL_LO12_I | |
4703 | || type == R_RISCV_TPREL_LO12_S) | |
e23eba97 | 4704 | relax_func = _bfd_riscv_relax_tls_le; |
45f76423 AW |
4705 | else |
4706 | continue; | |
abd20cb6 NC |
4707 | } |
4708 | else if (info->relax_pass == 1 | |
1942a048 | 4709 | && !bfd_link_pic (info) |
abd20cb6 NC |
4710 | && (type == R_RISCV_PCREL_HI20 |
4711 | || type == R_RISCV_PCREL_LO12_I | |
4712 | || type == R_RISCV_PCREL_LO12_S)) | |
4713 | relax_func = _bfd_riscv_relax_pc; | |
4714 | else if (info->relax_pass == 2 && type == R_RISCV_DELETE) | |
4715 | relax_func = _bfd_riscv_relax_delete; | |
4716 | else if (info->relax_pass == 3 && type == R_RISCV_ALIGN) | |
4717 | relax_func = _bfd_riscv_relax_align; | |
4718 | else | |
4719 | continue; | |
45f76423 | 4720 | |
abd20cb6 NC |
4721 | if (info->relax_pass < 2) |
4722 | { | |
45f76423 AW |
4723 | /* Only relax this reloc if it is paired with R_RISCV_RELAX. */ |
4724 | if (i == sec->reloc_count - 1 | |
4725 | || ELFNN_R_TYPE ((rel + 1)->r_info) != R_RISCV_RELAX | |
4726 | || rel->r_offset != (rel + 1)->r_offset) | |
4727 | continue; | |
4728 | ||
4729 | /* Skip over the R_RISCV_RELAX. */ | |
4730 | i++; | |
e23eba97 | 4731 | } |
e23eba97 NC |
4732 | |
4733 | data->relocs = relocs; | |
4734 | ||
4735 | /* Read this BFD's contents if we haven't done so already. */ | |
4736 | if (!data->this_hdr.contents | |
4737 | && !bfd_malloc_and_get_section (abfd, sec, &data->this_hdr.contents)) | |
4738 | goto fail; | |
4739 | ||
4740 | /* Read this BFD's symbols if we haven't done so already. */ | |
4741 | if (symtab_hdr->sh_info != 0 | |
4742 | && !symtab_hdr->contents | |
4743 | && !(symtab_hdr->contents = | |
4744 | (unsigned char *) bfd_elf_get_elf_syms (abfd, symtab_hdr, | |
4745 | symtab_hdr->sh_info, | |
4746 | 0, NULL, NULL, NULL))) | |
4747 | goto fail; | |
4748 | ||
4749 | /* Get the value of the symbol referred to by the reloc. */ | |
4750 | if (ELFNN_R_SYM (rel->r_info) < symtab_hdr->sh_info) | |
4751 | { | |
4752 | /* A local symbol. */ | |
4753 | Elf_Internal_Sym *isym = ((Elf_Internal_Sym *) symtab_hdr->contents | |
4754 | + ELFNN_R_SYM (rel->r_info)); | |
45f76423 AW |
4755 | reserve_size = (isym->st_size - rel->r_addend) > isym->st_size |
4756 | ? 0 : isym->st_size - rel->r_addend; | |
e23eba97 | 4757 | |
02dd9d25 NC |
4758 | /* Relocate against local STT_GNU_IFUNC symbol. we have created |
4759 | a fake global symbol entry for this, so deal with the local ifunc | |
4760 | as a global. */ | |
4761 | if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) | |
4762 | continue; | |
4763 | ||
e23eba97 | 4764 | if (isym->st_shndx == SHN_UNDEF) |
04b865dc | 4765 | sym_sec = sec, symval = rel->r_offset; |
e23eba97 NC |
4766 | else |
4767 | { | |
4768 | BFD_ASSERT (isym->st_shndx < elf_numsections (abfd)); | |
4769 | sym_sec = elf_elfsections (abfd)[isym->st_shndx]->bfd_section; | |
09ca4b9d JW |
4770 | #if 0 |
4771 | /* The purpose of this code is unknown. It breaks linker scripts | |
4772 | for embedded development that place sections at address zero. | |
4773 | This code is believed to be unnecessary. Disabling it but not | |
4774 | yet removing it, in case something breaks. */ | |
e23eba97 NC |
4775 | if (sec_addr (sym_sec) == 0) |
4776 | continue; | |
09ca4b9d | 4777 | #endif |
04b865dc | 4778 | symval = isym->st_value; |
e23eba97 | 4779 | } |
04b865dc | 4780 | symtype = ELF_ST_TYPE (isym->st_info); |
e23eba97 NC |
4781 | } |
4782 | else | |
4783 | { | |
4784 | unsigned long indx; | |
4785 | struct elf_link_hash_entry *h; | |
4786 | ||
4787 | indx = ELFNN_R_SYM (rel->r_info) - symtab_hdr->sh_info; | |
4788 | h = elf_sym_hashes (abfd)[indx]; | |
4789 | ||
4790 | while (h->root.type == bfd_link_hash_indirect | |
4791 | || h->root.type == bfd_link_hash_warning) | |
4792 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
4793 | ||
02dd9d25 NC |
4794 | /* Disable the relaxation for ifunc. */ |
4795 | if (h != NULL && h->type == STT_GNU_IFUNC) | |
4796 | continue; | |
4797 | ||
9d1da81b JW |
4798 | if (h->root.type == bfd_link_hash_undefweak |
4799 | && (relax_func == _bfd_riscv_relax_lui | |
4800 | || relax_func == _bfd_riscv_relax_pc)) | |
4801 | { | |
4802 | /* For the lui and auipc relaxations, since the symbol | |
4803 | value of an undefined weak symbol is always be zero, | |
4804 | we can optimize the patterns into a single LI/MV/ADDI | |
4805 | instruction. | |
4806 | ||
4807 | Note that, creating shared libraries and pie output may | |
4808 | break the rule above. Fortunately, since we do not relax | |
4809 | pc relocs when creating shared libraries and pie output, | |
4810 | and the absolute address access for R_RISCV_HI20 isn't | |
4811 | allowed when "-fPIC" is set, the problem of creating shared | |
4812 | libraries can not happen currently. Once we support the | |
4813 | auipc relaxations when creating shared libraries, then we will | |
4814 | need the more rigorous checking for this optimization. */ | |
0a1b45a2 | 4815 | undefined_weak = true; |
9d1da81b JW |
4816 | } |
4817 | ||
85f78364 JW |
4818 | /* This line has to match the check in riscv_elf_relocate_section |
4819 | in the R_RISCV_CALL[_PLT] case. */ | |
4820 | if (bfd_link_pic (info) && h->plt.offset != MINUS_ONE) | |
04b865dc JW |
4821 | { |
4822 | sym_sec = htab->elf.splt; | |
4823 | symval = h->plt.offset; | |
4824 | } | |
9d1da81b JW |
4825 | else if (undefined_weak) |
4826 | { | |
4827 | symval = 0; | |
4828 | sym_sec = bfd_und_section_ptr; | |
4829 | } | |
a2714d6c AM |
4830 | else if ((h->root.type == bfd_link_hash_defined |
4831 | || h->root.type == bfd_link_hash_defweak) | |
4832 | && h->root.u.def.section != NULL | |
4833 | && h->root.u.def.section->output_section != NULL) | |
04b865dc JW |
4834 | { |
4835 | symval = h->root.u.def.value; | |
4836 | sym_sec = h->root.u.def.section; | |
4837 | } | |
a2714d6c AM |
4838 | else |
4839 | continue; | |
e23eba97 | 4840 | |
45f76423 AW |
4841 | if (h->type != STT_FUNC) |
4842 | reserve_size = | |
4843 | (h->size - rel->r_addend) > h->size ? 0 : h->size - rel->r_addend; | |
04b865dc | 4844 | symtype = h->type; |
e23eba97 NC |
4845 | } |
4846 | ||
04b865dc JW |
4847 | if (sym_sec->sec_info_type == SEC_INFO_TYPE_MERGE |
4848 | && (sym_sec->flags & SEC_MERGE)) | |
4849 | { | |
4850 | /* At this stage in linking, no SEC_MERGE symbol has been | |
4851 | adjusted, so all references to such symbols need to be | |
4852 | passed through _bfd_merged_section_offset. (Later, in | |
4853 | relocate_section, all SEC_MERGE symbols *except* for | |
4854 | section symbols have been adjusted.) | |
4855 | ||
4856 | gas may reduce relocations against symbols in SEC_MERGE | |
4857 | sections to a relocation against the section symbol when | |
4858 | the original addend was zero. When the reloc is against | |
4859 | a section symbol we should include the addend in the | |
4860 | offset passed to _bfd_merged_section_offset, since the | |
4861 | location of interest is the original symbol. On the | |
4862 | other hand, an access to "sym+addend" where "sym" is not | |
4863 | a section symbol should not include the addend; Such an | |
4864 | access is presumed to be an offset from "sym"; The | |
4865 | location of interest is just "sym". */ | |
4866 | if (symtype == STT_SECTION) | |
4867 | symval += rel->r_addend; | |
4868 | ||
4869 | symval = _bfd_merged_section_offset (abfd, &sym_sec, | |
4870 | elf_section_data (sym_sec)->sec_info, | |
4871 | symval); | |
4872 | ||
4873 | if (symtype != STT_SECTION) | |
4874 | symval += rel->r_addend; | |
4875 | } | |
4876 | else | |
4877 | symval += rel->r_addend; | |
4878 | ||
4879 | symval += sec_addr (sym_sec); | |
e23eba97 NC |
4880 | |
4881 | if (!relax_func (abfd, sec, sym_sec, info, rel, symval, | |
9d06997a | 4882 | max_alignment, reserve_size, again, |
9d1da81b | 4883 | &pcgp_relocs, undefined_weak)) |
e23eba97 NC |
4884 | goto fail; |
4885 | } | |
4886 | ||
0a1b45a2 | 4887 | ret = true; |
e23eba97 | 4888 | |
dc1e8a47 | 4889 | fail: |
e23eba97 NC |
4890 | if (relocs != data->relocs) |
4891 | free (relocs); | |
1942a048 | 4892 | riscv_free_pcgp_relocs (&pcgp_relocs, abfd, sec); |
e23eba97 | 4893 | |
ebdcad3f | 4894 | if (*again) |
0a1b45a2 | 4895 | htab->restart_relax = true; |
ebdcad3f | 4896 | |
e23eba97 NC |
4897 | return ret; |
4898 | } | |
4899 | ||
4900 | #if ARCH_SIZE == 32 | |
79b8e8ab | 4901 | # define PRSTATUS_SIZE 204 |
e23eba97 NC |
4902 | # define PRSTATUS_OFFSET_PR_CURSIG 12 |
4903 | # define PRSTATUS_OFFSET_PR_PID 24 | |
4904 | # define PRSTATUS_OFFSET_PR_REG 72 | |
4905 | # define ELF_GREGSET_T_SIZE 128 | |
4906 | # define PRPSINFO_SIZE 128 | |
4907 | # define PRPSINFO_OFFSET_PR_PID 16 | |
4908 | # define PRPSINFO_OFFSET_PR_FNAME 32 | |
4909 | # define PRPSINFO_OFFSET_PR_PSARGS 48 | |
0897bb7d AB |
4910 | # define PRPSINFO_PR_FNAME_LENGTH 16 |
4911 | # define PRPSINFO_PR_PSARGS_LENGTH 80 | |
e23eba97 NC |
4912 | #else |
4913 | # define PRSTATUS_SIZE 376 | |
4914 | # define PRSTATUS_OFFSET_PR_CURSIG 12 | |
4915 | # define PRSTATUS_OFFSET_PR_PID 32 | |
4916 | # define PRSTATUS_OFFSET_PR_REG 112 | |
4917 | # define ELF_GREGSET_T_SIZE 256 | |
4918 | # define PRPSINFO_SIZE 136 | |
4919 | # define PRPSINFO_OFFSET_PR_PID 24 | |
4920 | # define PRPSINFO_OFFSET_PR_FNAME 40 | |
4921 | # define PRPSINFO_OFFSET_PR_PSARGS 56 | |
0897bb7d AB |
4922 | # define PRPSINFO_PR_FNAME_LENGTH 16 |
4923 | # define PRPSINFO_PR_PSARGS_LENGTH 80 | |
e23eba97 NC |
4924 | #endif |
4925 | ||
0897bb7d AB |
4926 | /* Write PRSTATUS and PRPSINFO note into core file. This will be called |
4927 | before the generic code in elf.c. By checking the compiler defines we | |
4928 | only perform any action here if the generic code would otherwise not be | |
4929 | able to help us. The intention is that bare metal core dumps (where the | |
4930 | prstatus_t and/or prpsinfo_t might not be available) will use this code, | |
4931 | while non bare metal tools will use the generic elf code. */ | |
4932 | ||
4933 | static char * | |
4934 | riscv_write_core_note (bfd *abfd ATTRIBUTE_UNUSED, | |
4935 | char *buf ATTRIBUTE_UNUSED, | |
4936 | int *bufsiz ATTRIBUTE_UNUSED, | |
4937 | int note_type ATTRIBUTE_UNUSED, ...) | |
4938 | { | |
4939 | switch (note_type) | |
4940 | { | |
4941 | default: | |
4942 | return NULL; | |
4943 | ||
4944 | #if !defined (HAVE_PRPSINFO_T) | |
4945 | case NT_PRPSINFO: | |
4946 | { | |
4947 | char data[PRPSINFO_SIZE] ATTRIBUTE_NONSTRING; | |
4948 | va_list ap; | |
4949 | ||
4950 | va_start (ap, note_type); | |
4951 | memset (data, 0, sizeof (data)); | |
4952 | strncpy (data + PRPSINFO_OFFSET_PR_FNAME, va_arg (ap, const char *), | |
4953 | PRPSINFO_PR_FNAME_LENGTH); | |
4954 | #if GCC_VERSION == 8000 || GCC_VERSION == 8001 | |
4955 | DIAGNOSTIC_PUSH; | |
4956 | /* GCC 8.0 and 8.1 warn about 80 equals destination size with | |
4957 | -Wstringop-truncation: | |
4958 | https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85643 | |
4959 | */ | |
4960 | DIAGNOSTIC_IGNORE_STRINGOP_TRUNCATION; | |
4961 | #endif | |
4962 | strncpy (data + PRPSINFO_OFFSET_PR_PSARGS, va_arg (ap, const char *), | |
4963 | PRPSINFO_PR_PSARGS_LENGTH); | |
4964 | #if GCC_VERSION == 8000 || GCC_VERSION == 8001 | |
4965 | DIAGNOSTIC_POP; | |
4966 | #endif | |
4967 | va_end (ap); | |
4968 | return elfcore_write_note (abfd, buf, bufsiz, | |
4969 | "CORE", note_type, data, sizeof (data)); | |
4970 | } | |
4971 | #endif /* !HAVE_PRPSINFO_T */ | |
4972 | ||
4973 | #if !defined (HAVE_PRSTATUS_T) | |
4974 | case NT_PRSTATUS: | |
4975 | { | |
4976 | char data[PRSTATUS_SIZE]; | |
4977 | va_list ap; | |
4978 | long pid; | |
4979 | int cursig; | |
4980 | const void *greg; | |
4981 | ||
4982 | va_start (ap, note_type); | |
4983 | memset (data, 0, sizeof(data)); | |
4984 | pid = va_arg (ap, long); | |
4985 | bfd_put_32 (abfd, pid, data + PRSTATUS_OFFSET_PR_PID); | |
4986 | cursig = va_arg (ap, int); | |
4987 | bfd_put_16 (abfd, cursig, data + PRSTATUS_OFFSET_PR_CURSIG); | |
4988 | greg = va_arg (ap, const void *); | |
4989 | memcpy (data + PRSTATUS_OFFSET_PR_REG, greg, | |
4990 | PRSTATUS_SIZE - PRSTATUS_OFFSET_PR_REG - ARCH_SIZE / 8); | |
4991 | va_end (ap); | |
4992 | return elfcore_write_note (abfd, buf, bufsiz, | |
4993 | "CORE", note_type, data, sizeof (data)); | |
4994 | } | |
4995 | #endif /* !HAVE_PRSTATUS_T */ | |
4996 | } | |
4997 | } | |
4998 | ||
e23eba97 NC |
4999 | /* Support for core dump NOTE sections. */ |
5000 | ||
0a1b45a2 | 5001 | static bool |
e23eba97 NC |
5002 | riscv_elf_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) |
5003 | { | |
5004 | switch (note->descsz) | |
5005 | { | |
5006 | default: | |
0a1b45a2 | 5007 | return false; |
e23eba97 | 5008 | |
dcd709e0 | 5009 | case PRSTATUS_SIZE: /* sizeof(struct elf_prstatus) on Linux/RISC-V. */ |
e23eba97 NC |
5010 | /* pr_cursig */ |
5011 | elf_tdata (abfd)->core->signal | |
5012 | = bfd_get_16 (abfd, note->descdata + PRSTATUS_OFFSET_PR_CURSIG); | |
5013 | ||
5014 | /* pr_pid */ | |
5015 | elf_tdata (abfd)->core->lwpid | |
5016 | = bfd_get_32 (abfd, note->descdata + PRSTATUS_OFFSET_PR_PID); | |
5017 | break; | |
5018 | } | |
5019 | ||
5020 | /* Make a ".reg/999" section. */ | |
5021 | return _bfd_elfcore_make_pseudosection (abfd, ".reg", ELF_GREGSET_T_SIZE, | |
5022 | note->descpos + PRSTATUS_OFFSET_PR_REG); | |
5023 | } | |
5024 | ||
0a1b45a2 | 5025 | static bool |
e23eba97 NC |
5026 | riscv_elf_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) |
5027 | { | |
5028 | switch (note->descsz) | |
5029 | { | |
5030 | default: | |
0a1b45a2 | 5031 | return false; |
e23eba97 NC |
5032 | |
5033 | case PRPSINFO_SIZE: /* sizeof(struct elf_prpsinfo) on Linux/RISC-V. */ | |
5034 | /* pr_pid */ | |
5035 | elf_tdata (abfd)->core->pid | |
5036 | = bfd_get_32 (abfd, note->descdata + PRPSINFO_OFFSET_PR_PID); | |
5037 | ||
5038 | /* pr_fname */ | |
5039 | elf_tdata (abfd)->core->program = _bfd_elfcore_strndup | |
0897bb7d AB |
5040 | (abfd, note->descdata + PRPSINFO_OFFSET_PR_FNAME, |
5041 | PRPSINFO_PR_FNAME_LENGTH); | |
e23eba97 NC |
5042 | |
5043 | /* pr_psargs */ | |
5044 | elf_tdata (abfd)->core->command = _bfd_elfcore_strndup | |
0897bb7d AB |
5045 | (abfd, note->descdata + PRPSINFO_OFFSET_PR_PSARGS, |
5046 | PRPSINFO_PR_PSARGS_LENGTH); | |
e23eba97 NC |
5047 | break; |
5048 | } | |
5049 | ||
5050 | /* Note that for some reason, a spurious space is tacked | |
5051 | onto the end of the args in some (at least one anyway) | |
5052 | implementations, so strip it off if it exists. */ | |
5053 | ||
5054 | { | |
5055 | char *command = elf_tdata (abfd)->core->command; | |
5056 | int n = strlen (command); | |
5057 | ||
5058 | if (0 < n && command[n - 1] == ' ') | |
5059 | command[n - 1] = '\0'; | |
5060 | } | |
5061 | ||
0a1b45a2 | 5062 | return true; |
e23eba97 NC |
5063 | } |
5064 | ||
640d6bfd | 5065 | /* Set the right mach type. */ |
dcd709e0 | 5066 | |
0a1b45a2 | 5067 | static bool |
640d6bfd KLC |
5068 | riscv_elf_object_p (bfd *abfd) |
5069 | { | |
5070 | /* There are only two mach types in RISCV currently. */ | |
fbc09e7a MC |
5071 | if (strcmp (abfd->xvec->name, "elf32-littleriscv") == 0 |
5072 | || strcmp (abfd->xvec->name, "elf32-bigriscv") == 0) | |
640d6bfd KLC |
5073 | bfd_default_set_arch_mach (abfd, bfd_arch_riscv, bfd_mach_riscv32); |
5074 | else | |
5075 | bfd_default_set_arch_mach (abfd, bfd_arch_riscv, bfd_mach_riscv64); | |
5076 | ||
0a1b45a2 | 5077 | return true; |
640d6bfd KLC |
5078 | } |
5079 | ||
2dc8dd17 JW |
5080 | /* Determine whether an object attribute tag takes an integer, a |
5081 | string or both. */ | |
5082 | ||
5083 | static int | |
5084 | riscv_elf_obj_attrs_arg_type (int tag) | |
5085 | { | |
5086 | return (tag & 1) != 0 ? ATTR_TYPE_FLAG_STR_VAL : ATTR_TYPE_FLAG_INT_VAL; | |
5087 | } | |
e23eba97 | 5088 | |
1942a048 NC |
5089 | #define TARGET_LITTLE_SYM riscv_elfNN_vec |
5090 | #define TARGET_LITTLE_NAME "elfNN-littleriscv" | |
5091 | #define TARGET_BIG_SYM riscv_elfNN_be_vec | |
5092 | #define TARGET_BIG_NAME "elfNN-bigriscv" | |
e23eba97 | 5093 | |
1942a048 | 5094 | #define elf_backend_reloc_type_class riscv_reloc_type_class |
e23eba97 | 5095 | |
1942a048 NC |
5096 | #define bfd_elfNN_bfd_reloc_name_lookup riscv_reloc_name_lookup |
5097 | #define bfd_elfNN_bfd_link_hash_table_create riscv_elf_link_hash_table_create | |
5098 | #define bfd_elfNN_bfd_reloc_type_lookup riscv_reloc_type_lookup | |
e23eba97 NC |
5099 | #define bfd_elfNN_bfd_merge_private_bfd_data \ |
5100 | _bfd_riscv_elf_merge_private_bfd_data | |
5101 | ||
1942a048 NC |
5102 | #define elf_backend_copy_indirect_symbol riscv_elf_copy_indirect_symbol |
5103 | #define elf_backend_create_dynamic_sections riscv_elf_create_dynamic_sections | |
5104 | #define elf_backend_check_relocs riscv_elf_check_relocs | |
5105 | #define elf_backend_adjust_dynamic_symbol riscv_elf_adjust_dynamic_symbol | |
5106 | #define elf_backend_size_dynamic_sections riscv_elf_size_dynamic_sections | |
5107 | #define elf_backend_relocate_section riscv_elf_relocate_section | |
5108 | #define elf_backend_finish_dynamic_symbol riscv_elf_finish_dynamic_symbol | |
5109 | #define elf_backend_finish_dynamic_sections riscv_elf_finish_dynamic_sections | |
5110 | #define elf_backend_gc_mark_hook riscv_elf_gc_mark_hook | |
5111 | #define elf_backend_plt_sym_val riscv_elf_plt_sym_val | |
5112 | #define elf_backend_grok_prstatus riscv_elf_grok_prstatus | |
5113 | #define elf_backend_grok_psinfo riscv_elf_grok_psinfo | |
5114 | #define elf_backend_object_p riscv_elf_object_p | |
0897bb7d | 5115 | #define elf_backend_write_core_note riscv_write_core_note |
1942a048 NC |
5116 | #define elf_info_to_howto_rel NULL |
5117 | #define elf_info_to_howto riscv_info_to_howto_rela | |
5118 | #define bfd_elfNN_bfd_relax_section _bfd_riscv_relax_section | |
5119 | #define bfd_elfNN_mkobject elfNN_riscv_mkobject | |
5120 | ||
5121 | #define elf_backend_init_index_section _bfd_elf_init_1_index_section | |
5122 | ||
5123 | #define elf_backend_can_gc_sections 1 | |
5124 | #define elf_backend_can_refcount 1 | |
5125 | #define elf_backend_want_got_plt 1 | |
5126 | #define elf_backend_plt_readonly 1 | |
5127 | #define elf_backend_plt_alignment 4 | |
5128 | #define elf_backend_want_plt_sym 1 | |
5129 | #define elf_backend_got_header_size (ARCH_SIZE / 8) | |
5130 | #define elf_backend_want_dynrelro 1 | |
5131 | #define elf_backend_rela_normal 1 | |
5132 | #define elf_backend_default_execstack 0 | |
e23eba97 | 5133 | |
2dc8dd17 | 5134 | #undef elf_backend_obj_attrs_vendor |
1942a048 | 5135 | #define elf_backend_obj_attrs_vendor "riscv" |
2dc8dd17 | 5136 | #undef elf_backend_obj_attrs_arg_type |
1942a048 | 5137 | #define elf_backend_obj_attrs_arg_type riscv_elf_obj_attrs_arg_type |
2dc8dd17 | 5138 | #undef elf_backend_obj_attrs_section_type |
1942a048 | 5139 | #define elf_backend_obj_attrs_section_type SHT_RISCV_ATTRIBUTES |
2dc8dd17 | 5140 | #undef elf_backend_obj_attrs_section |
1942a048 | 5141 | #define elf_backend_obj_attrs_section ".riscv.attributes" |
2dc8dd17 | 5142 | |
e23eba97 | 5143 | #include "elfNN-target.h" |