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e23eba97 | 1 | /* RISC-V-specific support for NN-bit ELF. |
219d1afa | 2 | Copyright (C) 2011-2018 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" | |
34 | ||
ff6f4d9b PD |
35 | /* Internal relocations used exclusively by the relaxation pass. */ |
36 | #define R_RISCV_DELETE (R_RISCV_max + 1) | |
37 | ||
e23eba97 NC |
38 | #define ARCH_SIZE NN |
39 | ||
40 | #define MINUS_ONE ((bfd_vma)0 - 1) | |
41 | ||
42 | #define RISCV_ELF_LOG_WORD_BYTES (ARCH_SIZE == 32 ? 2 : 3) | |
43 | ||
44 | #define RISCV_ELF_WORD_BYTES (1 << RISCV_ELF_LOG_WORD_BYTES) | |
45 | ||
46 | /* The name of the dynamic interpreter. This is put in the .interp | |
47 | section. */ | |
48 | ||
49 | #define ELF64_DYNAMIC_INTERPRETER "/lib/ld.so.1" | |
50 | #define ELF32_DYNAMIC_INTERPRETER "/lib32/ld.so.1" | |
51 | ||
52 | #define ELF_ARCH bfd_arch_riscv | |
53 | #define ELF_TARGET_ID RISCV_ELF_DATA | |
54 | #define ELF_MACHINE_CODE EM_RISCV | |
55 | #define ELF_MAXPAGESIZE 0x1000 | |
56 | #define ELF_COMMONPAGESIZE 0x1000 | |
57 | ||
e23eba97 NC |
58 | /* RISC-V ELF linker hash entry. */ |
59 | ||
60 | struct riscv_elf_link_hash_entry | |
61 | { | |
62 | struct elf_link_hash_entry elf; | |
63 | ||
64 | /* Track dynamic relocs copied for this symbol. */ | |
3bf083ed | 65 | struct elf_dyn_relocs *dyn_relocs; |
e23eba97 NC |
66 | |
67 | #define GOT_UNKNOWN 0 | |
68 | #define GOT_NORMAL 1 | |
69 | #define GOT_TLS_GD 2 | |
70 | #define GOT_TLS_IE 4 | |
71 | #define GOT_TLS_LE 8 | |
72 | char tls_type; | |
73 | }; | |
74 | ||
75 | #define riscv_elf_hash_entry(ent) \ | |
76 | ((struct riscv_elf_link_hash_entry *)(ent)) | |
77 | ||
78 | struct _bfd_riscv_elf_obj_tdata | |
79 | { | |
80 | struct elf_obj_tdata root; | |
81 | ||
82 | /* tls_type for each local got entry. */ | |
83 | char *local_got_tls_type; | |
84 | }; | |
85 | ||
86 | #define _bfd_riscv_elf_tdata(abfd) \ | |
87 | ((struct _bfd_riscv_elf_obj_tdata *) (abfd)->tdata.any) | |
88 | ||
89 | #define _bfd_riscv_elf_local_got_tls_type(abfd) \ | |
90 | (_bfd_riscv_elf_tdata (abfd)->local_got_tls_type) | |
91 | ||
92 | #define _bfd_riscv_elf_tls_type(abfd, h, symndx) \ | |
93 | (*((h) != NULL ? &riscv_elf_hash_entry (h)->tls_type \ | |
94 | : &_bfd_riscv_elf_local_got_tls_type (abfd) [symndx])) | |
95 | ||
96 | #define is_riscv_elf(bfd) \ | |
97 | (bfd_get_flavour (bfd) == bfd_target_elf_flavour \ | |
98 | && elf_tdata (bfd) != NULL \ | |
99 | && elf_object_id (bfd) == RISCV_ELF_DATA) | |
100 | ||
101 | #include "elf/common.h" | |
102 | #include "elf/internal.h" | |
103 | ||
104 | struct riscv_elf_link_hash_table | |
105 | { | |
106 | struct elf_link_hash_table elf; | |
107 | ||
108 | /* Short-cuts to get to dynamic linker sections. */ | |
e23eba97 NC |
109 | asection *sdyntdata; |
110 | ||
111 | /* Small local sym to section mapping cache. */ | |
112 | struct sym_cache sym_cache; | |
fc3c5343 L |
113 | |
114 | /* The max alignment of output sections. */ | |
115 | bfd_vma max_alignment; | |
e23eba97 NC |
116 | }; |
117 | ||
118 | ||
119 | /* Get the RISC-V ELF linker hash table from a link_info structure. */ | |
120 | #define riscv_elf_hash_table(p) \ | |
121 | (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \ | |
122 | == RISCV_ELF_DATA ? ((struct riscv_elf_link_hash_table *) ((p)->hash)) : NULL) | |
123 | ||
f3185997 | 124 | static bfd_boolean |
0aa13fee | 125 | riscv_info_to_howto_rela (bfd *abfd, |
e23eba97 NC |
126 | arelent *cache_ptr, |
127 | Elf_Internal_Rela *dst) | |
128 | { | |
0aa13fee | 129 | cache_ptr->howto = riscv_elf_rtype_to_howto (abfd, ELFNN_R_TYPE (dst->r_info)); |
f3185997 | 130 | return cache_ptr->howto != NULL; |
e23eba97 NC |
131 | } |
132 | ||
133 | static void | |
134 | riscv_elf_append_rela (bfd *abfd, asection *s, Elf_Internal_Rela *rel) | |
135 | { | |
136 | const struct elf_backend_data *bed; | |
137 | bfd_byte *loc; | |
138 | ||
139 | bed = get_elf_backend_data (abfd); | |
140 | loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rela); | |
141 | bed->s->swap_reloca_out (abfd, rel, loc); | |
142 | } | |
143 | ||
144 | /* PLT/GOT stuff. */ | |
145 | ||
146 | #define PLT_HEADER_INSNS 8 | |
147 | #define PLT_ENTRY_INSNS 4 | |
148 | #define PLT_HEADER_SIZE (PLT_HEADER_INSNS * 4) | |
149 | #define PLT_ENTRY_SIZE (PLT_ENTRY_INSNS * 4) | |
150 | ||
151 | #define GOT_ENTRY_SIZE RISCV_ELF_WORD_BYTES | |
152 | ||
153 | #define GOTPLT_HEADER_SIZE (2 * GOT_ENTRY_SIZE) | |
154 | ||
155 | #define sec_addr(sec) ((sec)->output_section->vma + (sec)->output_offset) | |
156 | ||
157 | static bfd_vma | |
158 | riscv_elf_got_plt_val (bfd_vma plt_index, struct bfd_link_info *info) | |
159 | { | |
160 | return sec_addr (riscv_elf_hash_table (info)->elf.sgotplt) | |
161 | + GOTPLT_HEADER_SIZE + (plt_index * GOT_ENTRY_SIZE); | |
162 | } | |
163 | ||
164 | #if ARCH_SIZE == 32 | |
165 | # define MATCH_LREG MATCH_LW | |
166 | #else | |
167 | # define MATCH_LREG MATCH_LD | |
168 | #endif | |
169 | ||
170 | /* Generate a PLT header. */ | |
171 | ||
172 | static void | |
173 | riscv_make_plt_header (bfd_vma gotplt_addr, bfd_vma addr, uint32_t *entry) | |
174 | { | |
175 | bfd_vma gotplt_offset_high = RISCV_PCREL_HIGH_PART (gotplt_addr, addr); | |
176 | bfd_vma gotplt_offset_low = RISCV_PCREL_LOW_PART (gotplt_addr, addr); | |
177 | ||
178 | /* auipc t2, %hi(.got.plt) | |
07d6d2b8 | 179 | sub t1, t1, t3 # shifted .got.plt offset + hdr size + 12 |
e23eba97 NC |
180 | l[w|d] t3, %lo(.got.plt)(t2) # _dl_runtime_resolve |
181 | addi t1, t1, -(hdr size + 12) # shifted .got.plt offset | |
182 | addi t0, t2, %lo(.got.plt) # &.got.plt | |
183 | srli t1, t1, log2(16/PTRSIZE) # .got.plt offset | |
07d6d2b8 AM |
184 | l[w|d] t0, PTRSIZE(t0) # link map |
185 | jr t3 */ | |
e23eba97 NC |
186 | |
187 | entry[0] = RISCV_UTYPE (AUIPC, X_T2, gotplt_offset_high); | |
188 | entry[1] = RISCV_RTYPE (SUB, X_T1, X_T1, X_T3); | |
189 | entry[2] = RISCV_ITYPE (LREG, X_T3, X_T2, gotplt_offset_low); | |
190 | entry[3] = RISCV_ITYPE (ADDI, X_T1, X_T1, -(PLT_HEADER_SIZE + 12)); | |
191 | entry[4] = RISCV_ITYPE (ADDI, X_T0, X_T2, gotplt_offset_low); | |
192 | entry[5] = RISCV_ITYPE (SRLI, X_T1, X_T1, 4 - RISCV_ELF_LOG_WORD_BYTES); | |
193 | entry[6] = RISCV_ITYPE (LREG, X_T0, X_T0, RISCV_ELF_WORD_BYTES); | |
194 | entry[7] = RISCV_ITYPE (JALR, 0, X_T3, 0); | |
195 | } | |
196 | ||
197 | /* Generate a PLT entry. */ | |
198 | ||
199 | static void | |
200 | riscv_make_plt_entry (bfd_vma got, bfd_vma addr, uint32_t *entry) | |
201 | { | |
202 | /* auipc t3, %hi(.got.plt entry) | |
203 | l[w|d] t3, %lo(.got.plt entry)(t3) | |
204 | jalr t1, t3 | |
205 | nop */ | |
206 | ||
207 | entry[0] = RISCV_UTYPE (AUIPC, X_T3, RISCV_PCREL_HIGH_PART (got, addr)); | |
1d65abb5 | 208 | entry[1] = RISCV_ITYPE (LREG, X_T3, X_T3, RISCV_PCREL_LOW_PART (got, addr)); |
e23eba97 NC |
209 | entry[2] = RISCV_ITYPE (JALR, X_T1, X_T3, 0); |
210 | entry[3] = RISCV_NOP; | |
211 | } | |
212 | ||
213 | /* Create an entry in an RISC-V ELF linker hash table. */ | |
214 | ||
215 | static struct bfd_hash_entry * | |
216 | link_hash_newfunc (struct bfd_hash_entry *entry, | |
217 | struct bfd_hash_table *table, const char *string) | |
218 | { | |
219 | /* Allocate the structure if it has not already been allocated by a | |
220 | subclass. */ | |
221 | if (entry == NULL) | |
222 | { | |
223 | entry = | |
224 | bfd_hash_allocate (table, | |
225 | sizeof (struct riscv_elf_link_hash_entry)); | |
226 | if (entry == NULL) | |
227 | return entry; | |
228 | } | |
229 | ||
230 | /* Call the allocation method of the superclass. */ | |
231 | entry = _bfd_elf_link_hash_newfunc (entry, table, string); | |
232 | if (entry != NULL) | |
233 | { | |
234 | struct riscv_elf_link_hash_entry *eh; | |
235 | ||
236 | eh = (struct riscv_elf_link_hash_entry *) entry; | |
237 | eh->dyn_relocs = NULL; | |
238 | eh->tls_type = GOT_UNKNOWN; | |
239 | } | |
240 | ||
241 | return entry; | |
242 | } | |
243 | ||
244 | /* Create a RISC-V ELF linker hash table. */ | |
245 | ||
246 | static struct bfd_link_hash_table * | |
247 | riscv_elf_link_hash_table_create (bfd *abfd) | |
248 | { | |
249 | struct riscv_elf_link_hash_table *ret; | |
250 | bfd_size_type amt = sizeof (struct riscv_elf_link_hash_table); | |
251 | ||
252 | ret = (struct riscv_elf_link_hash_table *) bfd_zmalloc (amt); | |
253 | if (ret == NULL) | |
254 | return NULL; | |
255 | ||
256 | if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc, | |
257 | sizeof (struct riscv_elf_link_hash_entry), | |
258 | RISCV_ELF_DATA)) | |
259 | { | |
260 | free (ret); | |
261 | return NULL; | |
262 | } | |
263 | ||
fc3c5343 | 264 | ret->max_alignment = (bfd_vma) -1; |
e23eba97 NC |
265 | return &ret->elf.root; |
266 | } | |
267 | ||
268 | /* Create the .got section. */ | |
269 | ||
270 | static bfd_boolean | |
271 | riscv_elf_create_got_section (bfd *abfd, struct bfd_link_info *info) | |
272 | { | |
273 | flagword flags; | |
274 | asection *s, *s_got; | |
275 | struct elf_link_hash_entry *h; | |
276 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); | |
277 | struct elf_link_hash_table *htab = elf_hash_table (info); | |
278 | ||
279 | /* This function may be called more than once. */ | |
ce558b89 | 280 | if (htab->sgot != NULL) |
e23eba97 NC |
281 | return TRUE; |
282 | ||
283 | flags = bed->dynamic_sec_flags; | |
284 | ||
285 | s = bfd_make_section_anyway_with_flags (abfd, | |
286 | (bed->rela_plts_and_copies_p | |
287 | ? ".rela.got" : ".rel.got"), | |
288 | (bed->dynamic_sec_flags | |
289 | | SEC_READONLY)); | |
290 | if (s == NULL | |
291 | || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) | |
292 | return FALSE; | |
293 | htab->srelgot = s; | |
294 | ||
295 | s = s_got = bfd_make_section_anyway_with_flags (abfd, ".got", flags); | |
296 | if (s == NULL | |
297 | || !bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) | |
298 | return FALSE; | |
299 | htab->sgot = s; | |
300 | ||
301 | /* The first bit of the global offset table is the header. */ | |
302 | s->size += bed->got_header_size; | |
303 | ||
304 | if (bed->want_got_plt) | |
305 | { | |
306 | s = bfd_make_section_anyway_with_flags (abfd, ".got.plt", flags); | |
307 | if (s == NULL | |
308 | || !bfd_set_section_alignment (abfd, s, | |
309 | bed->s->log_file_align)) | |
310 | return FALSE; | |
311 | htab->sgotplt = s; | |
312 | ||
313 | /* Reserve room for the header. */ | |
314 | s->size += GOTPLT_HEADER_SIZE; | |
315 | } | |
316 | ||
317 | if (bed->want_got_sym) | |
318 | { | |
319 | /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got | |
320 | section. We don't do this in the linker script because we don't want | |
321 | to define the symbol if we are not creating a global offset | |
322 | table. */ | |
323 | h = _bfd_elf_define_linkage_sym (abfd, info, s_got, | |
324 | "_GLOBAL_OFFSET_TABLE_"); | |
325 | elf_hash_table (info)->hgot = h; | |
326 | if (h == NULL) | |
327 | return FALSE; | |
328 | } | |
329 | ||
330 | return TRUE; | |
331 | } | |
332 | ||
333 | /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and | |
334 | .rela.bss sections in DYNOBJ, and set up shortcuts to them in our | |
335 | hash table. */ | |
336 | ||
337 | static bfd_boolean | |
338 | riscv_elf_create_dynamic_sections (bfd *dynobj, | |
339 | struct bfd_link_info *info) | |
340 | { | |
341 | struct riscv_elf_link_hash_table *htab; | |
342 | ||
343 | htab = riscv_elf_hash_table (info); | |
344 | BFD_ASSERT (htab != NULL); | |
345 | ||
346 | if (!riscv_elf_create_got_section (dynobj, info)) | |
347 | return FALSE; | |
348 | ||
349 | if (!_bfd_elf_create_dynamic_sections (dynobj, info)) | |
350 | return FALSE; | |
351 | ||
e23eba97 NC |
352 | if (!bfd_link_pic (info)) |
353 | { | |
e23eba97 NC |
354 | htab->sdyntdata = |
355 | bfd_make_section_anyway_with_flags (dynobj, ".tdata.dyn", | |
13755f40 JW |
356 | (SEC_ALLOC | SEC_THREAD_LOCAL |
357 | | SEC_LINKER_CREATED)); | |
e23eba97 NC |
358 | } |
359 | ||
9d19e4fd AM |
360 | if (!htab->elf.splt || !htab->elf.srelplt || !htab->elf.sdynbss |
361 | || (!bfd_link_pic (info) && (!htab->elf.srelbss || !htab->sdyntdata))) | |
e23eba97 NC |
362 | abort (); |
363 | ||
364 | return TRUE; | |
365 | } | |
366 | ||
367 | /* Copy the extra info we tack onto an elf_link_hash_entry. */ | |
368 | ||
369 | static void | |
370 | riscv_elf_copy_indirect_symbol (struct bfd_link_info *info, | |
371 | struct elf_link_hash_entry *dir, | |
372 | struct elf_link_hash_entry *ind) | |
373 | { | |
374 | struct riscv_elf_link_hash_entry *edir, *eind; | |
375 | ||
376 | edir = (struct riscv_elf_link_hash_entry *) dir; | |
377 | eind = (struct riscv_elf_link_hash_entry *) ind; | |
378 | ||
379 | if (eind->dyn_relocs != NULL) | |
380 | { | |
381 | if (edir->dyn_relocs != NULL) | |
382 | { | |
3bf083ed AM |
383 | struct elf_dyn_relocs **pp; |
384 | struct elf_dyn_relocs *p; | |
e23eba97 NC |
385 | |
386 | /* Add reloc counts against the indirect sym to the direct sym | |
387 | list. Merge any entries against the same section. */ | |
388 | for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) | |
389 | { | |
3bf083ed | 390 | struct elf_dyn_relocs *q; |
e23eba97 NC |
391 | |
392 | for (q = edir->dyn_relocs; q != NULL; q = q->next) | |
393 | if (q->sec == p->sec) | |
394 | { | |
395 | q->pc_count += p->pc_count; | |
396 | q->count += p->count; | |
397 | *pp = p->next; | |
398 | break; | |
399 | } | |
400 | if (q == NULL) | |
401 | pp = &p->next; | |
402 | } | |
403 | *pp = edir->dyn_relocs; | |
404 | } | |
405 | ||
406 | edir->dyn_relocs = eind->dyn_relocs; | |
407 | eind->dyn_relocs = NULL; | |
408 | } | |
409 | ||
410 | if (ind->root.type == bfd_link_hash_indirect | |
411 | && dir->got.refcount <= 0) | |
412 | { | |
413 | edir->tls_type = eind->tls_type; | |
414 | eind->tls_type = GOT_UNKNOWN; | |
415 | } | |
416 | _bfd_elf_link_hash_copy_indirect (info, dir, ind); | |
417 | } | |
418 | ||
419 | static bfd_boolean | |
420 | riscv_elf_record_tls_type (bfd *abfd, struct elf_link_hash_entry *h, | |
421 | unsigned long symndx, char tls_type) | |
422 | { | |
423 | char *new_tls_type = &_bfd_riscv_elf_tls_type (abfd, h, symndx); | |
424 | ||
425 | *new_tls_type |= tls_type; | |
426 | if ((*new_tls_type & GOT_NORMAL) && (*new_tls_type & ~GOT_NORMAL)) | |
427 | { | |
428 | (*_bfd_error_handler) | |
871b3ab2 | 429 | (_("%pB: `%s' accessed both as normal and thread local symbol"), |
e23eba97 NC |
430 | abfd, h ? h->root.root.string : "<local>"); |
431 | return FALSE; | |
432 | } | |
433 | return TRUE; | |
434 | } | |
435 | ||
436 | static bfd_boolean | |
437 | riscv_elf_record_got_reference (bfd *abfd, struct bfd_link_info *info, | |
438 | struct elf_link_hash_entry *h, long symndx) | |
439 | { | |
440 | struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info); | |
441 | Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
442 | ||
443 | if (htab->elf.sgot == NULL) | |
444 | { | |
445 | if (!riscv_elf_create_got_section (htab->elf.dynobj, info)) | |
446 | return FALSE; | |
447 | } | |
448 | ||
449 | if (h != NULL) | |
450 | { | |
451 | h->got.refcount += 1; | |
452 | return TRUE; | |
453 | } | |
454 | ||
455 | /* This is a global offset table entry for a local symbol. */ | |
456 | if (elf_local_got_refcounts (abfd) == NULL) | |
457 | { | |
458 | bfd_size_type size = symtab_hdr->sh_info * (sizeof (bfd_vma) + 1); | |
459 | if (!(elf_local_got_refcounts (abfd) = bfd_zalloc (abfd, size))) | |
460 | return FALSE; | |
461 | _bfd_riscv_elf_local_got_tls_type (abfd) | |
462 | = (char *) (elf_local_got_refcounts (abfd) + symtab_hdr->sh_info); | |
463 | } | |
464 | elf_local_got_refcounts (abfd) [symndx] += 1; | |
465 | ||
466 | return TRUE; | |
467 | } | |
468 | ||
469 | static bfd_boolean | |
470 | bad_static_reloc (bfd *abfd, unsigned r_type, struct elf_link_hash_entry *h) | |
471 | { | |
f3185997 NC |
472 | reloc_howto_type * r = riscv_elf_rtype_to_howto (abfd, r_type); |
473 | ||
e23eba97 | 474 | (*_bfd_error_handler) |
871b3ab2 | 475 | (_("%pB: relocation %s against `%s' can not be used when making a shared " |
e23eba97 | 476 | "object; recompile with -fPIC"), |
f3185997 NC |
477 | abfd, r ? r->name : _("<unknown>"), |
478 | h != NULL ? h->root.root.string : "a local symbol"); | |
e23eba97 NC |
479 | bfd_set_error (bfd_error_bad_value); |
480 | return FALSE; | |
481 | } | |
482 | /* Look through the relocs for a section during the first phase, and | |
483 | allocate space in the global offset table or procedure linkage | |
484 | table. */ | |
485 | ||
486 | static bfd_boolean | |
487 | riscv_elf_check_relocs (bfd *abfd, struct bfd_link_info *info, | |
488 | asection *sec, const Elf_Internal_Rela *relocs) | |
489 | { | |
490 | struct riscv_elf_link_hash_table *htab; | |
491 | Elf_Internal_Shdr *symtab_hdr; | |
492 | struct elf_link_hash_entry **sym_hashes; | |
493 | const Elf_Internal_Rela *rel; | |
494 | asection *sreloc = NULL; | |
495 | ||
496 | if (bfd_link_relocatable (info)) | |
497 | return TRUE; | |
498 | ||
499 | htab = riscv_elf_hash_table (info); | |
500 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
501 | sym_hashes = elf_sym_hashes (abfd); | |
502 | ||
503 | if (htab->elf.dynobj == NULL) | |
504 | htab->elf.dynobj = abfd; | |
505 | ||
506 | for (rel = relocs; rel < relocs + sec->reloc_count; rel++) | |
507 | { | |
508 | unsigned int r_type; | |
d42c267e | 509 | unsigned int r_symndx; |
e23eba97 NC |
510 | struct elf_link_hash_entry *h; |
511 | ||
512 | r_symndx = ELFNN_R_SYM (rel->r_info); | |
513 | r_type = ELFNN_R_TYPE (rel->r_info); | |
514 | ||
515 | if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) | |
516 | { | |
871b3ab2 | 517 | (*_bfd_error_handler) (_("%pB: bad symbol index: %d"), |
e23eba97 NC |
518 | abfd, r_symndx); |
519 | return FALSE; | |
520 | } | |
521 | ||
522 | if (r_symndx < symtab_hdr->sh_info) | |
523 | h = NULL; | |
524 | else | |
525 | { | |
526 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
527 | while (h->root.type == bfd_link_hash_indirect | |
528 | || h->root.type == bfd_link_hash_warning) | |
529 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
e23eba97 NC |
530 | } |
531 | ||
532 | switch (r_type) | |
533 | { | |
534 | case R_RISCV_TLS_GD_HI20: | |
535 | if (!riscv_elf_record_got_reference (abfd, info, h, r_symndx) | |
536 | || !riscv_elf_record_tls_type (abfd, h, r_symndx, GOT_TLS_GD)) | |
537 | return FALSE; | |
538 | break; | |
539 | ||
540 | case R_RISCV_TLS_GOT_HI20: | |
541 | if (bfd_link_pic (info)) | |
542 | info->flags |= DF_STATIC_TLS; | |
543 | if (!riscv_elf_record_got_reference (abfd, info, h, r_symndx) | |
544 | || !riscv_elf_record_tls_type (abfd, h, r_symndx, GOT_TLS_IE)) | |
545 | return FALSE; | |
546 | break; | |
547 | ||
548 | case R_RISCV_GOT_HI20: | |
549 | if (!riscv_elf_record_got_reference (abfd, info, h, r_symndx) | |
550 | || !riscv_elf_record_tls_type (abfd, h, r_symndx, GOT_NORMAL)) | |
551 | return FALSE; | |
552 | break; | |
553 | ||
554 | case R_RISCV_CALL_PLT: | |
555 | /* This symbol requires a procedure linkage table entry. We | |
556 | actually build the entry in adjust_dynamic_symbol, | |
557 | because this might be a case of linking PIC code without | |
558 | linking in any dynamic objects, in which case we don't | |
559 | need to generate a procedure linkage table after all. */ | |
560 | ||
561 | if (h != NULL) | |
562 | { | |
563 | h->needs_plt = 1; | |
564 | h->plt.refcount += 1; | |
565 | } | |
566 | break; | |
567 | ||
568 | case R_RISCV_CALL: | |
569 | case R_RISCV_JAL: | |
570 | case R_RISCV_BRANCH: | |
571 | case R_RISCV_RVC_BRANCH: | |
572 | case R_RISCV_RVC_JUMP: | |
573 | case R_RISCV_PCREL_HI20: | |
574 | /* In shared libraries, these relocs are known to bind locally. */ | |
575 | if (bfd_link_pic (info)) | |
576 | break; | |
577 | goto static_reloc; | |
578 | ||
579 | case R_RISCV_TPREL_HI20: | |
580 | if (!bfd_link_executable (info)) | |
581 | return bad_static_reloc (abfd, r_type, h); | |
582 | if (h != NULL) | |
583 | riscv_elf_record_tls_type (abfd, h, r_symndx, GOT_TLS_LE); | |
584 | goto static_reloc; | |
585 | ||
586 | case R_RISCV_HI20: | |
587 | if (bfd_link_pic (info)) | |
588 | return bad_static_reloc (abfd, r_type, h); | |
589 | /* Fall through. */ | |
590 | ||
591 | case R_RISCV_COPY: | |
592 | case R_RISCV_JUMP_SLOT: | |
593 | case R_RISCV_RELATIVE: | |
594 | case R_RISCV_64: | |
595 | case R_RISCV_32: | |
596 | /* Fall through. */ | |
597 | ||
598 | static_reloc: | |
599 | /* This reloc might not bind locally. */ | |
600 | if (h != NULL) | |
601 | h->non_got_ref = 1; | |
602 | ||
603 | if (h != NULL && !bfd_link_pic (info)) | |
604 | { | |
605 | /* We may need a .plt entry if the function this reloc | |
606 | refers to is in a shared lib. */ | |
607 | h->plt.refcount += 1; | |
608 | } | |
609 | ||
610 | /* If we are creating a shared library, and this is a reloc | |
611 | against a global symbol, or a non PC relative reloc | |
612 | against a local symbol, then we need to copy the reloc | |
613 | into the shared library. However, if we are linking with | |
614 | -Bsymbolic, we do not need to copy a reloc against a | |
615 | global symbol which is defined in an object we are | |
616 | including in the link (i.e., DEF_REGULAR is set). At | |
617 | this point we have not seen all the input files, so it is | |
618 | possible that DEF_REGULAR is not set now but will be set | |
619 | later (it is never cleared). In case of a weak definition, | |
620 | DEF_REGULAR may be cleared later by a strong definition in | |
621 | a shared library. We account for that possibility below by | |
622 | storing information in the relocs_copied field of the hash | |
623 | table entry. A similar situation occurs when creating | |
624 | shared libraries and symbol visibility changes render the | |
625 | symbol local. | |
626 | ||
627 | If on the other hand, we are creating an executable, we | |
628 | may need to keep relocations for symbols satisfied by a | |
629 | dynamic library if we manage to avoid copy relocs for the | |
630 | symbol. */ | |
f3185997 NC |
631 | reloc_howto_type * r = riscv_elf_rtype_to_howto (abfd, r_type); |
632 | ||
e23eba97 NC |
633 | if ((bfd_link_pic (info) |
634 | && (sec->flags & SEC_ALLOC) != 0 | |
f3185997 | 635 | && ((r != NULL && ! r->pc_relative) |
e23eba97 NC |
636 | || (h != NULL |
637 | && (! info->symbolic | |
638 | || h->root.type == bfd_link_hash_defweak | |
639 | || !h->def_regular)))) | |
640 | || (!bfd_link_pic (info) | |
641 | && (sec->flags & SEC_ALLOC) != 0 | |
642 | && h != NULL | |
643 | && (h->root.type == bfd_link_hash_defweak | |
644 | || !h->def_regular))) | |
645 | { | |
3bf083ed AM |
646 | struct elf_dyn_relocs *p; |
647 | struct elf_dyn_relocs **head; | |
e23eba97 NC |
648 | |
649 | /* When creating a shared object, we must copy these | |
650 | relocs into the output file. We create a reloc | |
651 | section in dynobj and make room for the reloc. */ | |
652 | if (sreloc == NULL) | |
653 | { | |
654 | sreloc = _bfd_elf_make_dynamic_reloc_section | |
655 | (sec, htab->elf.dynobj, RISCV_ELF_LOG_WORD_BYTES, | |
656 | abfd, /*rela?*/ TRUE); | |
657 | ||
658 | if (sreloc == NULL) | |
659 | return FALSE; | |
660 | } | |
661 | ||
662 | /* If this is a global symbol, we count the number of | |
663 | relocations we need for this symbol. */ | |
664 | if (h != NULL) | |
665 | head = &((struct riscv_elf_link_hash_entry *) h)->dyn_relocs; | |
666 | else | |
667 | { | |
668 | /* Track dynamic relocs needed for local syms too. | |
669 | We really need local syms available to do this | |
670 | easily. Oh well. */ | |
671 | ||
672 | asection *s; | |
673 | void *vpp; | |
674 | Elf_Internal_Sym *isym; | |
675 | ||
676 | isym = bfd_sym_from_r_symndx (&htab->sym_cache, | |
677 | abfd, r_symndx); | |
678 | if (isym == NULL) | |
679 | return FALSE; | |
680 | ||
681 | s = bfd_section_from_elf_index (abfd, isym->st_shndx); | |
682 | if (s == NULL) | |
683 | s = sec; | |
684 | ||
685 | vpp = &elf_section_data (s)->local_dynrel; | |
3bf083ed | 686 | head = (struct elf_dyn_relocs **) vpp; |
e23eba97 NC |
687 | } |
688 | ||
689 | p = *head; | |
690 | if (p == NULL || p->sec != sec) | |
691 | { | |
692 | bfd_size_type amt = sizeof *p; | |
3bf083ed | 693 | p = ((struct elf_dyn_relocs *) |
e23eba97 NC |
694 | bfd_alloc (htab->elf.dynobj, amt)); |
695 | if (p == NULL) | |
696 | return FALSE; | |
697 | p->next = *head; | |
698 | *head = p; | |
699 | p->sec = sec; | |
700 | p->count = 0; | |
701 | p->pc_count = 0; | |
702 | } | |
703 | ||
704 | p->count += 1; | |
f3185997 | 705 | p->pc_count += r == NULL ? 0 : r->pc_relative; |
e23eba97 NC |
706 | } |
707 | ||
708 | break; | |
709 | ||
710 | case R_RISCV_GNU_VTINHERIT: | |
711 | if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) | |
712 | return FALSE; | |
713 | break; | |
714 | ||
715 | case R_RISCV_GNU_VTENTRY: | |
716 | if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) | |
717 | return FALSE; | |
718 | break; | |
719 | ||
720 | default: | |
721 | break; | |
722 | } | |
723 | } | |
724 | ||
725 | return TRUE; | |
726 | } | |
727 | ||
728 | static asection * | |
729 | riscv_elf_gc_mark_hook (asection *sec, | |
730 | struct bfd_link_info *info, | |
731 | Elf_Internal_Rela *rel, | |
732 | struct elf_link_hash_entry *h, | |
733 | Elf_Internal_Sym *sym) | |
734 | { | |
735 | if (h != NULL) | |
736 | switch (ELFNN_R_TYPE (rel->r_info)) | |
737 | { | |
738 | case R_RISCV_GNU_VTINHERIT: | |
739 | case R_RISCV_GNU_VTENTRY: | |
740 | return NULL; | |
741 | } | |
742 | ||
743 | return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); | |
744 | } | |
745 | ||
63c1f59d AM |
746 | /* Find dynamic relocs for H that apply to read-only sections. */ |
747 | ||
748 | static asection * | |
749 | readonly_dynrelocs (struct elf_link_hash_entry *h) | |
750 | { | |
3bf083ed | 751 | struct elf_dyn_relocs *p; |
63c1f59d AM |
752 | |
753 | for (p = riscv_elf_hash_entry (h)->dyn_relocs; p != NULL; p = p->next) | |
754 | { | |
755 | asection *s = p->sec->output_section; | |
756 | ||
757 | if (s != NULL && (s->flags & SEC_READONLY) != 0) | |
758 | return p->sec; | |
759 | } | |
760 | return NULL; | |
761 | } | |
762 | ||
e23eba97 NC |
763 | /* Adjust a symbol defined by a dynamic object and referenced by a |
764 | regular object. The current definition is in some section of the | |
765 | dynamic object, but we're not including those sections. We have to | |
766 | change the definition to something the rest of the link can | |
767 | understand. */ | |
768 | ||
769 | static bfd_boolean | |
770 | riscv_elf_adjust_dynamic_symbol (struct bfd_link_info *info, | |
771 | struct elf_link_hash_entry *h) | |
772 | { | |
773 | struct riscv_elf_link_hash_table *htab; | |
774 | struct riscv_elf_link_hash_entry * eh; | |
e23eba97 | 775 | bfd *dynobj; |
5474d94f | 776 | asection *s, *srel; |
e23eba97 NC |
777 | |
778 | htab = riscv_elf_hash_table (info); | |
779 | BFD_ASSERT (htab != NULL); | |
780 | ||
781 | dynobj = htab->elf.dynobj; | |
782 | ||
783 | /* Make sure we know what is going on here. */ | |
784 | BFD_ASSERT (dynobj != NULL | |
785 | && (h->needs_plt | |
786 | || h->type == STT_GNU_IFUNC | |
60d67dc8 | 787 | || h->is_weakalias |
e23eba97 NC |
788 | || (h->def_dynamic |
789 | && h->ref_regular | |
790 | && !h->def_regular))); | |
791 | ||
792 | /* If this is a function, put it in the procedure linkage table. We | |
793 | will fill in the contents of the procedure linkage table later | |
794 | (although we could actually do it here). */ | |
795 | if (h->type == STT_FUNC || h->type == STT_GNU_IFUNC || h->needs_plt) | |
796 | { | |
797 | if (h->plt.refcount <= 0 | |
798 | || SYMBOL_CALLS_LOCAL (info, h) | |
799 | || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT | |
800 | && h->root.type == bfd_link_hash_undefweak)) | |
801 | { | |
802 | /* This case can occur if we saw a R_RISCV_CALL_PLT reloc in an | |
803 | input file, but the symbol was never referred to by a dynamic | |
804 | object, or if all references were garbage collected. In such | |
805 | a case, we don't actually need to build a PLT entry. */ | |
806 | h->plt.offset = (bfd_vma) -1; | |
807 | h->needs_plt = 0; | |
808 | } | |
809 | ||
810 | return TRUE; | |
811 | } | |
812 | else | |
813 | h->plt.offset = (bfd_vma) -1; | |
814 | ||
815 | /* If this is a weak symbol, and there is a real definition, the | |
816 | processor independent code will have arranged for us to see the | |
817 | real definition first, and we can just use the same value. */ | |
60d67dc8 | 818 | if (h->is_weakalias) |
e23eba97 | 819 | { |
60d67dc8 AM |
820 | struct elf_link_hash_entry *def = weakdef (h); |
821 | BFD_ASSERT (def->root.type == bfd_link_hash_defined); | |
822 | h->root.u.def.section = def->root.u.def.section; | |
823 | h->root.u.def.value = def->root.u.def.value; | |
e23eba97 NC |
824 | return TRUE; |
825 | } | |
826 | ||
827 | /* This is a reference to a symbol defined by a dynamic object which | |
828 | is not a function. */ | |
829 | ||
830 | /* If we are creating a shared library, we must presume that the | |
831 | only references to the symbol are via the global offset table. | |
832 | For such cases we need not do anything here; the relocations will | |
833 | be handled correctly by relocate_section. */ | |
834 | if (bfd_link_pic (info)) | |
835 | return TRUE; | |
836 | ||
837 | /* If there are no references to this symbol that do not use the | |
838 | GOT, we don't need to generate a copy reloc. */ | |
839 | if (!h->non_got_ref) | |
840 | return TRUE; | |
841 | ||
842 | /* If -z nocopyreloc was given, we won't generate them either. */ | |
843 | if (info->nocopyreloc) | |
844 | { | |
845 | h->non_got_ref = 0; | |
846 | return TRUE; | |
847 | } | |
848 | ||
3bf083ed | 849 | /* If we don't find any dynamic relocs in read-only sections, then |
e23eba97 | 850 | we'll be keeping the dynamic relocs and avoiding the copy reloc. */ |
3bf083ed | 851 | if (!readonly_dynrelocs (h)) |
e23eba97 NC |
852 | { |
853 | h->non_got_ref = 0; | |
854 | return TRUE; | |
855 | } | |
856 | ||
857 | /* We must allocate the symbol in our .dynbss section, which will | |
858 | become part of the .bss section of the executable. There will be | |
859 | an entry for this symbol in the .dynsym section. The dynamic | |
860 | object will contain position independent code, so all references | |
861 | from the dynamic object to this symbol will go through the global | |
862 | offset table. The dynamic linker will use the .dynsym entry to | |
863 | determine the address it must put in the global offset table, so | |
864 | both the dynamic object and the regular object will refer to the | |
865 | same memory location for the variable. */ | |
866 | ||
867 | /* We must generate a R_RISCV_COPY reloc to tell the dynamic linker | |
868 | to copy the initial value out of the dynamic object and into the | |
869 | runtime process image. We need to remember the offset into the | |
870 | .rel.bss section we are going to use. */ | |
3bf083ed | 871 | eh = (struct riscv_elf_link_hash_entry *) h; |
3df5cd13 AW |
872 | if (eh->tls_type & ~GOT_NORMAL) |
873 | { | |
874 | s = htab->sdyntdata; | |
875 | srel = htab->elf.srelbss; | |
876 | } | |
877 | else if ((h->root.u.def.section->flags & SEC_READONLY) != 0) | |
5474d94f AM |
878 | { |
879 | s = htab->elf.sdynrelro; | |
880 | srel = htab->elf.sreldynrelro; | |
881 | } | |
882 | else | |
883 | { | |
884 | s = htab->elf.sdynbss; | |
885 | srel = htab->elf.srelbss; | |
886 | } | |
e23eba97 NC |
887 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) |
888 | { | |
5474d94f | 889 | srel->size += sizeof (ElfNN_External_Rela); |
e23eba97 NC |
890 | h->needs_copy = 1; |
891 | } | |
892 | ||
5474d94f | 893 | return _bfd_elf_adjust_dynamic_copy (info, h, s); |
e23eba97 NC |
894 | } |
895 | ||
896 | /* Allocate space in .plt, .got and associated reloc sections for | |
897 | dynamic relocs. */ | |
898 | ||
899 | static bfd_boolean | |
900 | allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) | |
901 | { | |
902 | struct bfd_link_info *info; | |
903 | struct riscv_elf_link_hash_table *htab; | |
904 | struct riscv_elf_link_hash_entry *eh; | |
3bf083ed | 905 | struct elf_dyn_relocs *p; |
e23eba97 NC |
906 | |
907 | if (h->root.type == bfd_link_hash_indirect) | |
908 | return TRUE; | |
909 | ||
910 | info = (struct bfd_link_info *) inf; | |
911 | htab = riscv_elf_hash_table (info); | |
912 | BFD_ASSERT (htab != NULL); | |
913 | ||
914 | if (htab->elf.dynamic_sections_created | |
915 | && h->plt.refcount > 0) | |
916 | { | |
917 | /* Make sure this symbol is output as a dynamic symbol. | |
918 | Undefined weak syms won't yet be marked as dynamic. */ | |
919 | if (h->dynindx == -1 | |
920 | && !h->forced_local) | |
921 | { | |
922 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) | |
923 | return FALSE; | |
924 | } | |
925 | ||
926 | if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, bfd_link_pic (info), h)) | |
927 | { | |
928 | asection *s = htab->elf.splt; | |
929 | ||
930 | if (s->size == 0) | |
931 | s->size = PLT_HEADER_SIZE; | |
932 | ||
933 | h->plt.offset = s->size; | |
934 | ||
935 | /* Make room for this entry. */ | |
936 | s->size += PLT_ENTRY_SIZE; | |
937 | ||
938 | /* We also need to make an entry in the .got.plt section. */ | |
939 | htab->elf.sgotplt->size += GOT_ENTRY_SIZE; | |
940 | ||
941 | /* We also need to make an entry in the .rela.plt section. */ | |
942 | htab->elf.srelplt->size += sizeof (ElfNN_External_Rela); | |
943 | ||
944 | /* If this symbol is not defined in a regular file, and we are | |
945 | not generating a shared library, then set the symbol to this | |
946 | location in the .plt. This is required to make function | |
947 | pointers compare as equal between the normal executable and | |
948 | the shared library. */ | |
949 | if (! bfd_link_pic (info) | |
950 | && !h->def_regular) | |
951 | { | |
952 | h->root.u.def.section = s; | |
953 | h->root.u.def.value = h->plt.offset; | |
954 | } | |
955 | } | |
956 | else | |
957 | { | |
958 | h->plt.offset = (bfd_vma) -1; | |
959 | h->needs_plt = 0; | |
960 | } | |
961 | } | |
962 | else | |
963 | { | |
964 | h->plt.offset = (bfd_vma) -1; | |
965 | h->needs_plt = 0; | |
966 | } | |
967 | ||
968 | if (h->got.refcount > 0) | |
969 | { | |
970 | asection *s; | |
971 | bfd_boolean dyn; | |
972 | int tls_type = riscv_elf_hash_entry (h)->tls_type; | |
973 | ||
974 | /* Make sure this symbol is output as a dynamic symbol. | |
975 | Undefined weak syms won't yet be marked as dynamic. */ | |
976 | if (h->dynindx == -1 | |
977 | && !h->forced_local) | |
978 | { | |
979 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) | |
980 | return FALSE; | |
981 | } | |
982 | ||
983 | s = htab->elf.sgot; | |
984 | h->got.offset = s->size; | |
985 | dyn = htab->elf.dynamic_sections_created; | |
986 | if (tls_type & (GOT_TLS_GD | GOT_TLS_IE)) | |
987 | { | |
988 | /* TLS_GD needs two dynamic relocs and two GOT slots. */ | |
989 | if (tls_type & GOT_TLS_GD) | |
990 | { | |
991 | s->size += 2 * RISCV_ELF_WORD_BYTES; | |
992 | htab->elf.srelgot->size += 2 * sizeof (ElfNN_External_Rela); | |
993 | } | |
994 | ||
995 | /* TLS_IE needs one dynamic reloc and one GOT slot. */ | |
996 | if (tls_type & GOT_TLS_IE) | |
997 | { | |
998 | s->size += RISCV_ELF_WORD_BYTES; | |
999 | htab->elf.srelgot->size += sizeof (ElfNN_External_Rela); | |
1000 | } | |
1001 | } | |
1002 | else | |
1003 | { | |
1004 | s->size += RISCV_ELF_WORD_BYTES; | |
6487709f JW |
1005 | if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, bfd_link_pic (info), h) |
1006 | && ! UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)) | |
e23eba97 NC |
1007 | htab->elf.srelgot->size += sizeof (ElfNN_External_Rela); |
1008 | } | |
1009 | } | |
1010 | else | |
1011 | h->got.offset = (bfd_vma) -1; | |
1012 | ||
1013 | eh = (struct riscv_elf_link_hash_entry *) h; | |
1014 | if (eh->dyn_relocs == NULL) | |
1015 | return TRUE; | |
1016 | ||
1017 | /* In the shared -Bsymbolic case, discard space allocated for | |
1018 | dynamic pc-relative relocs against symbols which turn out to be | |
1019 | defined in regular objects. For the normal shared case, discard | |
1020 | space for pc-relative relocs that have become local due to symbol | |
1021 | visibility changes. */ | |
1022 | ||
1023 | if (bfd_link_pic (info)) | |
1024 | { | |
1025 | if (SYMBOL_CALLS_LOCAL (info, h)) | |
1026 | { | |
3bf083ed | 1027 | struct elf_dyn_relocs **pp; |
e23eba97 NC |
1028 | |
1029 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) | |
1030 | { | |
1031 | p->count -= p->pc_count; | |
1032 | p->pc_count = 0; | |
1033 | if (p->count == 0) | |
1034 | *pp = p->next; | |
1035 | else | |
1036 | pp = &p->next; | |
1037 | } | |
1038 | } | |
1039 | ||
1040 | /* Also discard relocs on undefined weak syms with non-default | |
1041 | visibility. */ | |
1042 | if (eh->dyn_relocs != NULL | |
1043 | && h->root.type == bfd_link_hash_undefweak) | |
1044 | { | |
6487709f JW |
1045 | if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT |
1046 | || UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)) | |
e23eba97 NC |
1047 | eh->dyn_relocs = NULL; |
1048 | ||
1049 | /* Make sure undefined weak symbols are output as a dynamic | |
1050 | symbol in PIEs. */ | |
1051 | else if (h->dynindx == -1 | |
1052 | && !h->forced_local) | |
1053 | { | |
1054 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) | |
1055 | return FALSE; | |
1056 | } | |
1057 | } | |
1058 | } | |
1059 | else | |
1060 | { | |
1061 | /* For the non-shared case, discard space for relocs against | |
1062 | symbols which turn out to need copy relocs or are not | |
1063 | dynamic. */ | |
1064 | ||
1065 | if (!h->non_got_ref | |
1066 | && ((h->def_dynamic | |
1067 | && !h->def_regular) | |
1068 | || (htab->elf.dynamic_sections_created | |
1069 | && (h->root.type == bfd_link_hash_undefweak | |
1070 | || h->root.type == bfd_link_hash_undefined)))) | |
1071 | { | |
1072 | /* Make sure this symbol is output as a dynamic symbol. | |
1073 | Undefined weak syms won't yet be marked as dynamic. */ | |
1074 | if (h->dynindx == -1 | |
1075 | && !h->forced_local) | |
1076 | { | |
1077 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) | |
1078 | return FALSE; | |
1079 | } | |
1080 | ||
1081 | /* If that succeeded, we know we'll be keeping all the | |
1082 | relocs. */ | |
1083 | if (h->dynindx != -1) | |
1084 | goto keep; | |
1085 | } | |
1086 | ||
1087 | eh->dyn_relocs = NULL; | |
1088 | ||
1089 | keep: ; | |
1090 | } | |
1091 | ||
1092 | /* Finally, allocate space. */ | |
1093 | for (p = eh->dyn_relocs; p != NULL; p = p->next) | |
1094 | { | |
1095 | asection *sreloc = elf_section_data (p->sec)->sreloc; | |
1096 | sreloc->size += p->count * sizeof (ElfNN_External_Rela); | |
1097 | } | |
1098 | ||
1099 | return TRUE; | |
1100 | } | |
1101 | ||
63c1f59d AM |
1102 | /* Set DF_TEXTREL if we find any dynamic relocs that apply to |
1103 | read-only sections. */ | |
e23eba97 NC |
1104 | |
1105 | static bfd_boolean | |
63c1f59d | 1106 | maybe_set_textrel (struct elf_link_hash_entry *h, void *info_p) |
e23eba97 | 1107 | { |
63c1f59d | 1108 | asection *sec; |
e23eba97 | 1109 | |
63c1f59d AM |
1110 | if (h->root.type == bfd_link_hash_indirect) |
1111 | return TRUE; | |
1112 | ||
1113 | sec = readonly_dynrelocs (h); | |
1114 | if (sec != NULL) | |
e23eba97 | 1115 | { |
63c1f59d | 1116 | struct bfd_link_info *info = (struct bfd_link_info *) info_p; |
e23eba97 | 1117 | |
63c1f59d AM |
1118 | info->flags |= DF_TEXTREL; |
1119 | info->callbacks->minfo | |
c1c8c1ef | 1120 | (_("%pB: dynamic relocation against `%pT' in read-only section `%pA'\n"), |
63c1f59d AM |
1121 | sec->owner, h->root.root.string, sec); |
1122 | ||
1123 | /* Not an error, just cut short the traversal. */ | |
1124 | return FALSE; | |
e23eba97 NC |
1125 | } |
1126 | return TRUE; | |
1127 | } | |
1128 | ||
1129 | static bfd_boolean | |
1130 | riscv_elf_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) | |
1131 | { | |
1132 | struct riscv_elf_link_hash_table *htab; | |
1133 | bfd *dynobj; | |
1134 | asection *s; | |
1135 | bfd *ibfd; | |
1136 | ||
1137 | htab = riscv_elf_hash_table (info); | |
1138 | BFD_ASSERT (htab != NULL); | |
1139 | dynobj = htab->elf.dynobj; | |
1140 | BFD_ASSERT (dynobj != NULL); | |
1141 | ||
1142 | if (elf_hash_table (info)->dynamic_sections_created) | |
1143 | { | |
1144 | /* Set the contents of the .interp section to the interpreter. */ | |
1145 | if (bfd_link_executable (info) && !info->nointerp) | |
1146 | { | |
1147 | s = bfd_get_linker_section (dynobj, ".interp"); | |
1148 | BFD_ASSERT (s != NULL); | |
1149 | s->size = strlen (ELFNN_DYNAMIC_INTERPRETER) + 1; | |
1150 | s->contents = (unsigned char *) ELFNN_DYNAMIC_INTERPRETER; | |
1151 | } | |
1152 | } | |
1153 | ||
1154 | /* Set up .got offsets for local syms, and space for local dynamic | |
1155 | relocs. */ | |
1156 | for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next) | |
1157 | { | |
1158 | bfd_signed_vma *local_got; | |
1159 | bfd_signed_vma *end_local_got; | |
1160 | char *local_tls_type; | |
1161 | bfd_size_type locsymcount; | |
1162 | Elf_Internal_Shdr *symtab_hdr; | |
1163 | asection *srel; | |
1164 | ||
1165 | if (! is_riscv_elf (ibfd)) | |
1166 | continue; | |
1167 | ||
1168 | for (s = ibfd->sections; s != NULL; s = s->next) | |
1169 | { | |
3bf083ed | 1170 | struct elf_dyn_relocs *p; |
e23eba97 NC |
1171 | |
1172 | for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next) | |
1173 | { | |
1174 | if (!bfd_is_abs_section (p->sec) | |
1175 | && bfd_is_abs_section (p->sec->output_section)) | |
1176 | { | |
1177 | /* Input section has been discarded, either because | |
1178 | it is a copy of a linkonce section or due to | |
1179 | linker script /DISCARD/, so we'll be discarding | |
1180 | the relocs too. */ | |
1181 | } | |
1182 | else if (p->count != 0) | |
1183 | { | |
1184 | srel = elf_section_data (p->sec)->sreloc; | |
1185 | srel->size += p->count * sizeof (ElfNN_External_Rela); | |
1186 | if ((p->sec->output_section->flags & SEC_READONLY) != 0) | |
1187 | info->flags |= DF_TEXTREL; | |
1188 | } | |
1189 | } | |
1190 | } | |
1191 | ||
1192 | local_got = elf_local_got_refcounts (ibfd); | |
1193 | if (!local_got) | |
1194 | continue; | |
1195 | ||
1196 | symtab_hdr = &elf_symtab_hdr (ibfd); | |
1197 | locsymcount = symtab_hdr->sh_info; | |
1198 | end_local_got = local_got + locsymcount; | |
1199 | local_tls_type = _bfd_riscv_elf_local_got_tls_type (ibfd); | |
1200 | s = htab->elf.sgot; | |
1201 | srel = htab->elf.srelgot; | |
1202 | for (; local_got < end_local_got; ++local_got, ++local_tls_type) | |
1203 | { | |
1204 | if (*local_got > 0) | |
1205 | { | |
1206 | *local_got = s->size; | |
1207 | s->size += RISCV_ELF_WORD_BYTES; | |
1208 | if (*local_tls_type & GOT_TLS_GD) | |
1209 | s->size += RISCV_ELF_WORD_BYTES; | |
1210 | if (bfd_link_pic (info) | |
1211 | || (*local_tls_type & (GOT_TLS_GD | GOT_TLS_IE))) | |
1212 | srel->size += sizeof (ElfNN_External_Rela); | |
1213 | } | |
1214 | else | |
1215 | *local_got = (bfd_vma) -1; | |
1216 | } | |
1217 | } | |
1218 | ||
1219 | /* Allocate global sym .plt and .got entries, and space for global | |
1220 | sym dynamic relocs. */ | |
1221 | elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info); | |
1222 | ||
1223 | if (htab->elf.sgotplt) | |
1224 | { | |
1225 | struct elf_link_hash_entry *got; | |
1226 | got = elf_link_hash_lookup (elf_hash_table (info), | |
1227 | "_GLOBAL_OFFSET_TABLE_", | |
1228 | FALSE, FALSE, FALSE); | |
1229 | ||
1230 | /* Don't allocate .got.plt section if there are no GOT nor PLT | |
1231 | entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */ | |
1232 | if ((got == NULL | |
1233 | || !got->ref_regular_nonweak) | |
1234 | && (htab->elf.sgotplt->size == GOTPLT_HEADER_SIZE) | |
1235 | && (htab->elf.splt == NULL | |
1236 | || htab->elf.splt->size == 0) | |
1237 | && (htab->elf.sgot == NULL | |
1238 | || (htab->elf.sgot->size | |
1239 | == get_elf_backend_data (output_bfd)->got_header_size))) | |
1240 | htab->elf.sgotplt->size = 0; | |
1241 | } | |
1242 | ||
1243 | /* The check_relocs and adjust_dynamic_symbol entry points have | |
1244 | determined the sizes of the various dynamic sections. Allocate | |
1245 | memory for them. */ | |
1246 | for (s = dynobj->sections; s != NULL; s = s->next) | |
1247 | { | |
1248 | if ((s->flags & SEC_LINKER_CREATED) == 0) | |
1249 | continue; | |
1250 | ||
1251 | if (s == htab->elf.splt | |
1252 | || s == htab->elf.sgot | |
1253 | || s == htab->elf.sgotplt | |
5474d94f AM |
1254 | || s == htab->elf.sdynbss |
1255 | || s == htab->elf.sdynrelro) | |
e23eba97 NC |
1256 | { |
1257 | /* Strip this section if we don't need it; see the | |
1258 | comment below. */ | |
1259 | } | |
1260 | else if (strncmp (s->name, ".rela", 5) == 0) | |
1261 | { | |
1262 | if (s->size != 0) | |
1263 | { | |
1264 | /* We use the reloc_count field as a counter if we need | |
1265 | to copy relocs into the output file. */ | |
1266 | s->reloc_count = 0; | |
1267 | } | |
1268 | } | |
1269 | else | |
1270 | { | |
1271 | /* It's not one of our sections. */ | |
1272 | continue; | |
1273 | } | |
1274 | ||
1275 | if (s->size == 0) | |
1276 | { | |
1277 | /* If we don't need this section, strip it from the | |
1278 | output file. This is mostly to handle .rela.bss and | |
1279 | .rela.plt. We must create both sections in | |
1280 | create_dynamic_sections, because they must be created | |
1281 | before the linker maps input sections to output | |
1282 | sections. The linker does that before | |
1283 | adjust_dynamic_symbol is called, and it is that | |
1284 | function which decides whether anything needs to go | |
1285 | into these sections. */ | |
1286 | s->flags |= SEC_EXCLUDE; | |
1287 | continue; | |
1288 | } | |
1289 | ||
1290 | if ((s->flags & SEC_HAS_CONTENTS) == 0) | |
1291 | continue; | |
1292 | ||
1293 | /* Allocate memory for the section contents. Zero the memory | |
1294 | for the benefit of .rela.plt, which has 4 unused entries | |
1295 | at the beginning, and we don't want garbage. */ | |
1296 | s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); | |
1297 | if (s->contents == NULL) | |
1298 | return FALSE; | |
1299 | } | |
1300 | ||
1301 | if (elf_hash_table (info)->dynamic_sections_created) | |
1302 | { | |
1303 | /* Add some entries to the .dynamic section. We fill in the | |
1304 | values later, in riscv_elf_finish_dynamic_sections, but we | |
1305 | must add the entries now so that we get the correct size for | |
1306 | the .dynamic section. The DT_DEBUG entry is filled in by the | |
1307 | dynamic linker and used by the debugger. */ | |
1308 | #define add_dynamic_entry(TAG, VAL) \ | |
1309 | _bfd_elf_add_dynamic_entry (info, TAG, VAL) | |
1310 | ||
1311 | if (bfd_link_executable (info)) | |
1312 | { | |
1313 | if (!add_dynamic_entry (DT_DEBUG, 0)) | |
1314 | return FALSE; | |
1315 | } | |
1316 | ||
1317 | if (htab->elf.srelplt->size != 0) | |
1318 | { | |
1319 | if (!add_dynamic_entry (DT_PLTGOT, 0) | |
1320 | || !add_dynamic_entry (DT_PLTRELSZ, 0) | |
1321 | || !add_dynamic_entry (DT_PLTREL, DT_RELA) | |
1322 | || !add_dynamic_entry (DT_JMPREL, 0)) | |
1323 | return FALSE; | |
1324 | } | |
1325 | ||
1326 | if (!add_dynamic_entry (DT_RELA, 0) | |
1327 | || !add_dynamic_entry (DT_RELASZ, 0) | |
1328 | || !add_dynamic_entry (DT_RELAENT, sizeof (ElfNN_External_Rela))) | |
1329 | return FALSE; | |
1330 | ||
1331 | /* If any dynamic relocs apply to a read-only section, | |
1332 | then we need a DT_TEXTREL entry. */ | |
1333 | if ((info->flags & DF_TEXTREL) == 0) | |
63c1f59d | 1334 | elf_link_hash_traverse (&htab->elf, maybe_set_textrel, info); |
e23eba97 NC |
1335 | |
1336 | if (info->flags & DF_TEXTREL) | |
1337 | { | |
1338 | if (!add_dynamic_entry (DT_TEXTREL, 0)) | |
1339 | return FALSE; | |
1340 | } | |
1341 | } | |
1342 | #undef add_dynamic_entry | |
1343 | ||
1344 | return TRUE; | |
1345 | } | |
1346 | ||
1347 | #define TP_OFFSET 0 | |
1348 | #define DTP_OFFSET 0x800 | |
1349 | ||
1350 | /* Return the relocation value for a TLS dtp-relative reloc. */ | |
1351 | ||
1352 | static bfd_vma | |
1353 | dtpoff (struct bfd_link_info *info, bfd_vma address) | |
1354 | { | |
1355 | /* If tls_sec is NULL, we should have signalled an error already. */ | |
1356 | if (elf_hash_table (info)->tls_sec == NULL) | |
1357 | return 0; | |
1358 | return address - elf_hash_table (info)->tls_sec->vma - DTP_OFFSET; | |
1359 | } | |
1360 | ||
1361 | /* Return the relocation value for a static TLS tp-relative relocation. */ | |
1362 | ||
1363 | static bfd_vma | |
1364 | tpoff (struct bfd_link_info *info, bfd_vma address) | |
1365 | { | |
1366 | /* If tls_sec is NULL, we should have signalled an error already. */ | |
1367 | if (elf_hash_table (info)->tls_sec == NULL) | |
1368 | return 0; | |
1369 | return address - elf_hash_table (info)->tls_sec->vma - TP_OFFSET; | |
1370 | } | |
1371 | ||
1372 | /* Return the global pointer's value, or 0 if it is not in use. */ | |
1373 | ||
1374 | static bfd_vma | |
1375 | riscv_global_pointer_value (struct bfd_link_info *info) | |
1376 | { | |
1377 | struct bfd_link_hash_entry *h; | |
1378 | ||
b5292032 | 1379 | h = bfd_link_hash_lookup (info->hash, RISCV_GP_SYMBOL, FALSE, FALSE, TRUE); |
e23eba97 NC |
1380 | if (h == NULL || h->type != bfd_link_hash_defined) |
1381 | return 0; | |
1382 | ||
1383 | return h->u.def.value + sec_addr (h->u.def.section); | |
1384 | } | |
1385 | ||
1386 | /* Emplace a static relocation. */ | |
1387 | ||
1388 | static bfd_reloc_status_type | |
1389 | perform_relocation (const reloc_howto_type *howto, | |
1390 | const Elf_Internal_Rela *rel, | |
1391 | bfd_vma value, | |
1392 | asection *input_section, | |
1393 | bfd *input_bfd, | |
1394 | bfd_byte *contents) | |
1395 | { | |
1396 | if (howto->pc_relative) | |
1397 | value -= sec_addr (input_section) + rel->r_offset; | |
1398 | value += rel->r_addend; | |
1399 | ||
1400 | switch (ELFNN_R_TYPE (rel->r_info)) | |
1401 | { | |
1402 | case R_RISCV_HI20: | |
1403 | case R_RISCV_TPREL_HI20: | |
1404 | case R_RISCV_PCREL_HI20: | |
1405 | case R_RISCV_GOT_HI20: | |
1406 | case R_RISCV_TLS_GOT_HI20: | |
1407 | case R_RISCV_TLS_GD_HI20: | |
1408 | if (ARCH_SIZE > 32 && !VALID_UTYPE_IMM (RISCV_CONST_HIGH_PART (value))) | |
1409 | return bfd_reloc_overflow; | |
1410 | value = ENCODE_UTYPE_IMM (RISCV_CONST_HIGH_PART (value)); | |
1411 | break; | |
1412 | ||
1413 | case R_RISCV_LO12_I: | |
1414 | case R_RISCV_GPREL_I: | |
1415 | case R_RISCV_TPREL_LO12_I: | |
45f76423 | 1416 | case R_RISCV_TPREL_I: |
e23eba97 NC |
1417 | case R_RISCV_PCREL_LO12_I: |
1418 | value = ENCODE_ITYPE_IMM (value); | |
1419 | break; | |
1420 | ||
1421 | case R_RISCV_LO12_S: | |
1422 | case R_RISCV_GPREL_S: | |
1423 | case R_RISCV_TPREL_LO12_S: | |
45f76423 | 1424 | case R_RISCV_TPREL_S: |
e23eba97 NC |
1425 | case R_RISCV_PCREL_LO12_S: |
1426 | value = ENCODE_STYPE_IMM (value); | |
1427 | break; | |
1428 | ||
1429 | case R_RISCV_CALL: | |
1430 | case R_RISCV_CALL_PLT: | |
1431 | if (ARCH_SIZE > 32 && !VALID_UTYPE_IMM (RISCV_CONST_HIGH_PART (value))) | |
1432 | return bfd_reloc_overflow; | |
1433 | value = ENCODE_UTYPE_IMM (RISCV_CONST_HIGH_PART (value)) | |
1434 | | (ENCODE_ITYPE_IMM (value) << 32); | |
1435 | break; | |
1436 | ||
1437 | case R_RISCV_JAL: | |
1438 | if (!VALID_UJTYPE_IMM (value)) | |
1439 | return bfd_reloc_overflow; | |
1440 | value = ENCODE_UJTYPE_IMM (value); | |
1441 | break; | |
1442 | ||
1443 | case R_RISCV_BRANCH: | |
1444 | if (!VALID_SBTYPE_IMM (value)) | |
1445 | return bfd_reloc_overflow; | |
1446 | value = ENCODE_SBTYPE_IMM (value); | |
1447 | break; | |
1448 | ||
1449 | case R_RISCV_RVC_BRANCH: | |
1450 | if (!VALID_RVC_B_IMM (value)) | |
1451 | return bfd_reloc_overflow; | |
1452 | value = ENCODE_RVC_B_IMM (value); | |
1453 | break; | |
1454 | ||
1455 | case R_RISCV_RVC_JUMP: | |
1456 | if (!VALID_RVC_J_IMM (value)) | |
1457 | return bfd_reloc_overflow; | |
1458 | value = ENCODE_RVC_J_IMM (value); | |
1459 | break; | |
1460 | ||
1461 | case R_RISCV_RVC_LUI: | |
1462 | if (!VALID_RVC_LUI_IMM (RISCV_CONST_HIGH_PART (value))) | |
1463 | return bfd_reloc_overflow; | |
1464 | value = ENCODE_RVC_LUI_IMM (RISCV_CONST_HIGH_PART (value)); | |
1465 | break; | |
1466 | ||
1467 | case R_RISCV_32: | |
1468 | case R_RISCV_64: | |
1469 | case R_RISCV_ADD8: | |
1470 | case R_RISCV_ADD16: | |
1471 | case R_RISCV_ADD32: | |
1472 | case R_RISCV_ADD64: | |
45f76423 | 1473 | case R_RISCV_SUB6: |
e23eba97 NC |
1474 | case R_RISCV_SUB8: |
1475 | case R_RISCV_SUB16: | |
1476 | case R_RISCV_SUB32: | |
1477 | case R_RISCV_SUB64: | |
45f76423 AW |
1478 | case R_RISCV_SET6: |
1479 | case R_RISCV_SET8: | |
1480 | case R_RISCV_SET16: | |
1481 | case R_RISCV_SET32: | |
a6cbf936 | 1482 | case R_RISCV_32_PCREL: |
e23eba97 NC |
1483 | case R_RISCV_TLS_DTPREL32: |
1484 | case R_RISCV_TLS_DTPREL64: | |
1485 | break; | |
1486 | ||
ff6f4d9b PD |
1487 | case R_RISCV_DELETE: |
1488 | return bfd_reloc_ok; | |
1489 | ||
e23eba97 NC |
1490 | default: |
1491 | return bfd_reloc_notsupported; | |
1492 | } | |
1493 | ||
1494 | bfd_vma word = bfd_get (howto->bitsize, input_bfd, contents + rel->r_offset); | |
1495 | word = (word & ~howto->dst_mask) | (value & howto->dst_mask); | |
1496 | bfd_put (howto->bitsize, input_bfd, word, contents + rel->r_offset); | |
1497 | ||
1498 | return bfd_reloc_ok; | |
1499 | } | |
1500 | ||
1501 | /* Remember all PC-relative high-part relocs we've encountered to help us | |
1502 | later resolve the corresponding low-part relocs. */ | |
1503 | ||
1504 | typedef struct | |
1505 | { | |
1506 | bfd_vma address; | |
1507 | bfd_vma value; | |
1508 | } riscv_pcrel_hi_reloc; | |
1509 | ||
1510 | typedef struct riscv_pcrel_lo_reloc | |
1511 | { | |
07d6d2b8 AM |
1512 | asection * input_section; |
1513 | struct bfd_link_info * info; | |
1514 | reloc_howto_type * howto; | |
1515 | const Elf_Internal_Rela * reloc; | |
1516 | bfd_vma addr; | |
1517 | const char * name; | |
1518 | bfd_byte * contents; | |
1519 | struct riscv_pcrel_lo_reloc * next; | |
e23eba97 NC |
1520 | } riscv_pcrel_lo_reloc; |
1521 | ||
1522 | typedef struct | |
1523 | { | |
1524 | htab_t hi_relocs; | |
1525 | riscv_pcrel_lo_reloc *lo_relocs; | |
1526 | } riscv_pcrel_relocs; | |
1527 | ||
1528 | static hashval_t | |
1529 | riscv_pcrel_reloc_hash (const void *entry) | |
1530 | { | |
1531 | const riscv_pcrel_hi_reloc *e = entry; | |
1532 | return (hashval_t)(e->address >> 2); | |
1533 | } | |
1534 | ||
1535 | static bfd_boolean | |
1536 | riscv_pcrel_reloc_eq (const void *entry1, const void *entry2) | |
1537 | { | |
1538 | const riscv_pcrel_hi_reloc *e1 = entry1, *e2 = entry2; | |
1539 | return e1->address == e2->address; | |
1540 | } | |
1541 | ||
1542 | static bfd_boolean | |
1543 | riscv_init_pcrel_relocs (riscv_pcrel_relocs *p) | |
1544 | { | |
1545 | ||
1546 | p->lo_relocs = NULL; | |
1547 | p->hi_relocs = htab_create (1024, riscv_pcrel_reloc_hash, | |
1548 | riscv_pcrel_reloc_eq, free); | |
1549 | return p->hi_relocs != NULL; | |
1550 | } | |
1551 | ||
1552 | static void | |
1553 | riscv_free_pcrel_relocs (riscv_pcrel_relocs *p) | |
1554 | { | |
1555 | riscv_pcrel_lo_reloc *cur = p->lo_relocs; | |
1556 | ||
1557 | while (cur != NULL) | |
1558 | { | |
1559 | riscv_pcrel_lo_reloc *next = cur->next; | |
1560 | free (cur); | |
1561 | cur = next; | |
1562 | } | |
1563 | ||
1564 | htab_delete (p->hi_relocs); | |
1565 | } | |
1566 | ||
1567 | static bfd_boolean | |
b1308d2c PD |
1568 | riscv_zero_pcrel_hi_reloc (Elf_Internal_Rela *rel, |
1569 | struct bfd_link_info *info, | |
1570 | bfd_vma pc, | |
1571 | bfd_vma addr, | |
1572 | bfd_byte *contents, | |
1573 | const reloc_howto_type *howto, | |
1574 | bfd *input_bfd) | |
e23eba97 | 1575 | { |
b1308d2c PD |
1576 | /* We may need to reference low addreses in PC-relative modes even when the |
1577 | * PC is far away from these addresses. For example, undefweak references | |
1578 | * need to produce the address 0 when linked. As 0 is far from the arbitrary | |
1579 | * addresses that we can link PC-relative programs at, the linker can't | |
1580 | * actually relocate references to those symbols. In order to allow these | |
1581 | * programs to work we simply convert the PC-relative auipc sequences to | |
1582 | * 0-relative lui sequences. */ | |
1583 | if (bfd_link_pic (info)) | |
1584 | return FALSE; | |
1585 | ||
1586 | /* If it's possible to reference the symbol using auipc we do so, as that's | |
1587 | * more in the spirit of the PC-relative relocations we're processing. */ | |
1588 | bfd_vma offset = addr - pc; | |
1589 | if (ARCH_SIZE == 32 || VALID_UTYPE_IMM (RISCV_CONST_HIGH_PART (offset))) | |
1590 | return FALSE; | |
1591 | ||
1592 | /* If it's impossible to reference this with a LUI-based offset then don't | |
1593 | * bother to convert it at all so users still see the PC-relative relocation | |
1594 | * in the truncation message. */ | |
1595 | if (ARCH_SIZE > 32 && !VALID_UTYPE_IMM (RISCV_CONST_HIGH_PART (addr))) | |
1596 | return FALSE; | |
1597 | ||
1598 | rel->r_info = ELFNN_R_INFO(addr, R_RISCV_HI20); | |
1599 | ||
1600 | bfd_vma insn = bfd_get(howto->bitsize, input_bfd, contents + rel->r_offset); | |
1601 | insn = (insn & ~MASK_AUIPC) | MATCH_LUI; | |
1602 | bfd_put(howto->bitsize, input_bfd, insn, contents + rel->r_offset); | |
1603 | return TRUE; | |
1604 | } | |
1605 | ||
1606 | static bfd_boolean | |
1607 | riscv_record_pcrel_hi_reloc (riscv_pcrel_relocs *p, bfd_vma addr, | |
1608 | bfd_vma value, bfd_boolean absolute) | |
1609 | { | |
1610 | bfd_vma offset = absolute ? value : value - addr; | |
1611 | riscv_pcrel_hi_reloc entry = {addr, offset}; | |
e23eba97 NC |
1612 | riscv_pcrel_hi_reloc **slot = |
1613 | (riscv_pcrel_hi_reloc **) htab_find_slot (p->hi_relocs, &entry, INSERT); | |
1614 | ||
1615 | BFD_ASSERT (*slot == NULL); | |
1616 | *slot = (riscv_pcrel_hi_reloc *) bfd_malloc (sizeof (riscv_pcrel_hi_reloc)); | |
1617 | if (*slot == NULL) | |
1618 | return FALSE; | |
1619 | **slot = entry; | |
1620 | return TRUE; | |
1621 | } | |
1622 | ||
1623 | static bfd_boolean | |
1624 | riscv_record_pcrel_lo_reloc (riscv_pcrel_relocs *p, | |
1625 | asection *input_section, | |
1626 | struct bfd_link_info *info, | |
1627 | reloc_howto_type *howto, | |
1628 | const Elf_Internal_Rela *reloc, | |
1629 | bfd_vma addr, | |
1630 | const char *name, | |
1631 | bfd_byte *contents) | |
1632 | { | |
1633 | riscv_pcrel_lo_reloc *entry; | |
1634 | entry = (riscv_pcrel_lo_reloc *) bfd_malloc (sizeof (riscv_pcrel_lo_reloc)); | |
1635 | if (entry == NULL) | |
1636 | return FALSE; | |
1637 | *entry = (riscv_pcrel_lo_reloc) {input_section, info, howto, reloc, addr, | |
1638 | name, contents, p->lo_relocs}; | |
1639 | p->lo_relocs = entry; | |
1640 | return TRUE; | |
1641 | } | |
1642 | ||
1643 | static bfd_boolean | |
1644 | riscv_resolve_pcrel_lo_relocs (riscv_pcrel_relocs *p) | |
1645 | { | |
1646 | riscv_pcrel_lo_reloc *r; | |
1647 | ||
1648 | for (r = p->lo_relocs; r != NULL; r = r->next) | |
1649 | { | |
1650 | bfd *input_bfd = r->input_section->owner; | |
1651 | ||
1652 | riscv_pcrel_hi_reloc search = {r->addr, 0}; | |
1653 | riscv_pcrel_hi_reloc *entry = htab_find (p->hi_relocs, &search); | |
551703cf JW |
1654 | if (entry == NULL |
1655 | /* Check for overflow into bit 11 when adding reloc addend. */ | |
1656 | || (! (entry->value & 0x800) | |
1657 | && ((entry->value + r->reloc->r_addend) & 0x800))) | |
07d6d2b8 | 1658 | { |
551703cf JW |
1659 | char *string = (entry == NULL |
1660 | ? "%pcrel_lo missing matching %pcrel_hi" | |
1661 | : "%pcrel_lo overflow with an addend"); | |
1662 | (*r->info->callbacks->reloc_dangerous) | |
1663 | (r->info, string, input_bfd, r->input_section, r->reloc->r_offset); | |
e23eba97 | 1664 | return TRUE; |
07d6d2b8 | 1665 | } |
e23eba97 NC |
1666 | |
1667 | perform_relocation (r->howto, r->reloc, entry->value, r->input_section, | |
1668 | input_bfd, r->contents); | |
1669 | } | |
1670 | ||
1671 | return TRUE; | |
1672 | } | |
1673 | ||
1674 | /* Relocate a RISC-V ELF section. | |
1675 | ||
1676 | The RELOCATE_SECTION function is called by the new ELF backend linker | |
1677 | to handle the relocations for a section. | |
1678 | ||
1679 | The relocs are always passed as Rela structures. | |
1680 | ||
1681 | This function is responsible for adjusting the section contents as | |
1682 | necessary, and (if generating a relocatable output file) adjusting | |
1683 | the reloc addend as necessary. | |
1684 | ||
1685 | This function does not have to worry about setting the reloc | |
1686 | address or the reloc symbol index. | |
1687 | ||
1688 | LOCAL_SYMS is a pointer to the swapped in local symbols. | |
1689 | ||
1690 | LOCAL_SECTIONS is an array giving the section in the input file | |
1691 | corresponding to the st_shndx field of each local symbol. | |
1692 | ||
1693 | The global hash table entry for the global symbols can be found | |
1694 | via elf_sym_hashes (input_bfd). | |
1695 | ||
1696 | When generating relocatable output, this function must handle | |
1697 | STB_LOCAL/STT_SECTION symbols specially. The output symbol is | |
1698 | going to be the section symbol corresponding to the output | |
1699 | section, which means that the addend must be adjusted | |
1700 | accordingly. */ | |
1701 | ||
1702 | static bfd_boolean | |
1703 | riscv_elf_relocate_section (bfd *output_bfd, | |
1704 | struct bfd_link_info *info, | |
1705 | bfd *input_bfd, | |
1706 | asection *input_section, | |
1707 | bfd_byte *contents, | |
1708 | Elf_Internal_Rela *relocs, | |
1709 | Elf_Internal_Sym *local_syms, | |
1710 | asection **local_sections) | |
1711 | { | |
1712 | Elf_Internal_Rela *rel; | |
1713 | Elf_Internal_Rela *relend; | |
1714 | riscv_pcrel_relocs pcrel_relocs; | |
1715 | bfd_boolean ret = FALSE; | |
1716 | asection *sreloc = elf_section_data (input_section)->sreloc; | |
1717 | struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info); | |
1718 | Elf_Internal_Shdr *symtab_hdr = &elf_symtab_hdr (input_bfd); | |
1719 | struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (input_bfd); | |
1720 | bfd_vma *local_got_offsets = elf_local_got_offsets (input_bfd); | |
b1308d2c | 1721 | bfd_boolean absolute; |
e23eba97 NC |
1722 | |
1723 | if (!riscv_init_pcrel_relocs (&pcrel_relocs)) | |
1724 | return FALSE; | |
1725 | ||
1726 | relend = relocs + input_section->reloc_count; | |
1727 | for (rel = relocs; rel < relend; rel++) | |
1728 | { | |
1729 | unsigned long r_symndx; | |
1730 | struct elf_link_hash_entry *h; | |
1731 | Elf_Internal_Sym *sym; | |
1732 | asection *sec; | |
1733 | bfd_vma relocation; | |
1734 | bfd_reloc_status_type r = bfd_reloc_ok; | |
1735 | const char *name; | |
1736 | bfd_vma off, ie_off; | |
1737 | bfd_boolean unresolved_reloc, is_ie = FALSE; | |
1738 | bfd_vma pc = sec_addr (input_section) + rel->r_offset; | |
1739 | int r_type = ELFNN_R_TYPE (rel->r_info), tls_type; | |
0aa13fee | 1740 | reloc_howto_type *howto = riscv_elf_rtype_to_howto (input_bfd, r_type); |
e23eba97 | 1741 | const char *msg = NULL; |
6487709f | 1742 | bfd_boolean resolved_to_zero; |
e23eba97 | 1743 | |
f3185997 NC |
1744 | if (howto == NULL |
1745 | || r_type == R_RISCV_GNU_VTINHERIT || r_type == R_RISCV_GNU_VTENTRY) | |
e23eba97 NC |
1746 | continue; |
1747 | ||
1748 | /* This is a final link. */ | |
1749 | r_symndx = ELFNN_R_SYM (rel->r_info); | |
1750 | h = NULL; | |
1751 | sym = NULL; | |
1752 | sec = NULL; | |
1753 | unresolved_reloc = FALSE; | |
1754 | if (r_symndx < symtab_hdr->sh_info) | |
1755 | { | |
1756 | sym = local_syms + r_symndx; | |
1757 | sec = local_sections[r_symndx]; | |
1758 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); | |
1759 | } | |
1760 | else | |
1761 | { | |
1762 | bfd_boolean warned, ignored; | |
1763 | ||
1764 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, | |
1765 | r_symndx, symtab_hdr, sym_hashes, | |
1766 | h, sec, relocation, | |
1767 | unresolved_reloc, warned, ignored); | |
1768 | if (warned) | |
1769 | { | |
1770 | /* To avoid generating warning messages about truncated | |
1771 | relocations, set the relocation's address to be the same as | |
1772 | the start of this section. */ | |
1773 | if (input_section->output_section != NULL) | |
1774 | relocation = input_section->output_section->vma; | |
1775 | else | |
1776 | relocation = 0; | |
1777 | } | |
1778 | } | |
1779 | ||
1780 | if (sec != NULL && discarded_section (sec)) | |
1781 | RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, | |
1782 | rel, 1, relend, howto, 0, contents); | |
1783 | ||
1784 | if (bfd_link_relocatable (info)) | |
1785 | continue; | |
1786 | ||
1787 | if (h != NULL) | |
1788 | name = h->root.root.string; | |
1789 | else | |
1790 | { | |
1791 | name = (bfd_elf_string_from_elf_section | |
1792 | (input_bfd, symtab_hdr->sh_link, sym->st_name)); | |
1793 | if (name == NULL || *name == '\0') | |
1794 | name = bfd_section_name (input_bfd, sec); | |
1795 | } | |
1796 | ||
6487709f JW |
1797 | resolved_to_zero = (h != NULL |
1798 | && UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)); | |
1799 | ||
e23eba97 NC |
1800 | switch (r_type) |
1801 | { | |
1802 | case R_RISCV_NONE: | |
45f76423 | 1803 | case R_RISCV_RELAX: |
e23eba97 NC |
1804 | case R_RISCV_TPREL_ADD: |
1805 | case R_RISCV_COPY: | |
1806 | case R_RISCV_JUMP_SLOT: | |
1807 | case R_RISCV_RELATIVE: | |
1808 | /* These require nothing of us at all. */ | |
1809 | continue; | |
1810 | ||
1811 | case R_RISCV_HI20: | |
1812 | case R_RISCV_BRANCH: | |
1813 | case R_RISCV_RVC_BRANCH: | |
1814 | case R_RISCV_RVC_LUI: | |
1815 | case R_RISCV_LO12_I: | |
1816 | case R_RISCV_LO12_S: | |
45f76423 AW |
1817 | case R_RISCV_SET6: |
1818 | case R_RISCV_SET8: | |
1819 | case R_RISCV_SET16: | |
1820 | case R_RISCV_SET32: | |
a6cbf936 | 1821 | case R_RISCV_32_PCREL: |
ff6f4d9b | 1822 | case R_RISCV_DELETE: |
e23eba97 NC |
1823 | /* These require no special handling beyond perform_relocation. */ |
1824 | break; | |
1825 | ||
1826 | case R_RISCV_GOT_HI20: | |
1827 | if (h != NULL) | |
1828 | { | |
1829 | bfd_boolean dyn, pic; | |
1830 | ||
1831 | off = h->got.offset; | |
1832 | BFD_ASSERT (off != (bfd_vma) -1); | |
1833 | dyn = elf_hash_table (info)->dynamic_sections_created; | |
1834 | pic = bfd_link_pic (info); | |
1835 | ||
1836 | if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, pic, h) | |
1837 | || (pic && SYMBOL_REFERENCES_LOCAL (info, h))) | |
1838 | { | |
1839 | /* This is actually a static link, or it is a | |
1840 | -Bsymbolic link and the symbol is defined | |
1841 | locally, or the symbol was forced to be local | |
1842 | because of a version file. We must initialize | |
1843 | this entry in the global offset table. Since the | |
1844 | offset must always be a multiple of the word size, | |
1845 | we use the least significant bit to record whether | |
1846 | we have initialized it already. | |
1847 | ||
1848 | When doing a dynamic link, we create a .rela.got | |
1849 | relocation entry to initialize the value. This | |
1850 | is done in the finish_dynamic_symbol routine. */ | |
1851 | if ((off & 1) != 0) | |
1852 | off &= ~1; | |
1853 | else | |
1854 | { | |
1855 | bfd_put_NN (output_bfd, relocation, | |
1856 | htab->elf.sgot->contents + off); | |
1857 | h->got.offset |= 1; | |
1858 | } | |
1859 | } | |
1860 | else | |
1861 | unresolved_reloc = FALSE; | |
1862 | } | |
1863 | else | |
1864 | { | |
1865 | BFD_ASSERT (local_got_offsets != NULL | |
1866 | && local_got_offsets[r_symndx] != (bfd_vma) -1); | |
1867 | ||
1868 | off = local_got_offsets[r_symndx]; | |
1869 | ||
1870 | /* The offset must always be a multiple of the word size. | |
1871 | So, we can use the least significant bit to record | |
1872 | whether we have already processed this entry. */ | |
1873 | if ((off & 1) != 0) | |
1874 | off &= ~1; | |
1875 | else | |
1876 | { | |
1877 | if (bfd_link_pic (info)) | |
1878 | { | |
1879 | asection *s; | |
1880 | Elf_Internal_Rela outrel; | |
1881 | ||
1882 | /* We need to generate a R_RISCV_RELATIVE reloc | |
1883 | for the dynamic linker. */ | |
1884 | s = htab->elf.srelgot; | |
1885 | BFD_ASSERT (s != NULL); | |
1886 | ||
1887 | outrel.r_offset = sec_addr (htab->elf.sgot) + off; | |
1888 | outrel.r_info = | |
1889 | ELFNN_R_INFO (0, R_RISCV_RELATIVE); | |
1890 | outrel.r_addend = relocation; | |
1891 | relocation = 0; | |
1892 | riscv_elf_append_rela (output_bfd, s, &outrel); | |
1893 | } | |
1894 | ||
1895 | bfd_put_NN (output_bfd, relocation, | |
1896 | htab->elf.sgot->contents + off); | |
1897 | local_got_offsets[r_symndx] |= 1; | |
1898 | } | |
1899 | } | |
1900 | relocation = sec_addr (htab->elf.sgot) + off; | |
b1308d2c PD |
1901 | absolute = riscv_zero_pcrel_hi_reloc (rel, |
1902 | info, | |
1903 | pc, | |
1904 | relocation, | |
1905 | contents, | |
1906 | howto, | |
1907 | input_bfd); | |
1908 | r_type = ELFNN_R_TYPE (rel->r_info); | |
0aa13fee | 1909 | howto = riscv_elf_rtype_to_howto (input_bfd, r_type); |
f3185997 NC |
1910 | if (howto == NULL) |
1911 | r = bfd_reloc_notsupported; | |
1912 | else if (!riscv_record_pcrel_hi_reloc (&pcrel_relocs, pc, | |
1913 | relocation, absolute)) | |
e23eba97 NC |
1914 | r = bfd_reloc_overflow; |
1915 | break; | |
1916 | ||
1917 | case R_RISCV_ADD8: | |
1918 | case R_RISCV_ADD16: | |
1919 | case R_RISCV_ADD32: | |
1920 | case R_RISCV_ADD64: | |
1921 | { | |
1922 | bfd_vma old_value = bfd_get (howto->bitsize, input_bfd, | |
1923 | contents + rel->r_offset); | |
1924 | relocation = old_value + relocation; | |
1925 | } | |
1926 | break; | |
1927 | ||
45f76423 | 1928 | case R_RISCV_SUB6: |
e23eba97 NC |
1929 | case R_RISCV_SUB8: |
1930 | case R_RISCV_SUB16: | |
1931 | case R_RISCV_SUB32: | |
1932 | case R_RISCV_SUB64: | |
1933 | { | |
1934 | bfd_vma old_value = bfd_get (howto->bitsize, input_bfd, | |
1935 | contents + rel->r_offset); | |
1936 | relocation = old_value - relocation; | |
1937 | } | |
1938 | break; | |
1939 | ||
e23eba97 | 1940 | case R_RISCV_CALL: |
cf7a5066 JW |
1941 | /* Handle a call to an undefined weak function. This won't be |
1942 | relaxed, so we have to handle it here. */ | |
1943 | if (h != NULL && h->root.type == bfd_link_hash_undefweak | |
1944 | && h->plt.offset == MINUS_ONE) | |
1945 | { | |
1946 | /* We can use x0 as the base register. */ | |
1947 | bfd_vma insn = bfd_get_32 (input_bfd, | |
1948 | contents + rel->r_offset + 4); | |
1949 | insn &= ~(OP_MASK_RS1 << OP_SH_RS1); | |
1950 | bfd_put_32 (input_bfd, insn, contents + rel->r_offset + 4); | |
1951 | /* Set the relocation value so that we get 0 after the pc | |
1952 | relative adjustment. */ | |
1953 | relocation = sec_addr (input_section) + rel->r_offset; | |
1954 | } | |
1955 | /* Fall through. */ | |
1956 | ||
1957 | case R_RISCV_CALL_PLT: | |
e23eba97 NC |
1958 | case R_RISCV_JAL: |
1959 | case R_RISCV_RVC_JUMP: | |
1960 | if (bfd_link_pic (info) && h != NULL && h->plt.offset != MINUS_ONE) | |
1961 | { | |
1962 | /* Refer to the PLT entry. */ | |
1963 | relocation = sec_addr (htab->elf.splt) + h->plt.offset; | |
1964 | unresolved_reloc = FALSE; | |
1965 | } | |
1966 | break; | |
1967 | ||
1968 | case R_RISCV_TPREL_HI20: | |
1969 | relocation = tpoff (info, relocation); | |
1970 | break; | |
1971 | ||
1972 | case R_RISCV_TPREL_LO12_I: | |
1973 | case R_RISCV_TPREL_LO12_S: | |
45f76423 AW |
1974 | relocation = tpoff (info, relocation); |
1975 | break; | |
1976 | ||
1977 | case R_RISCV_TPREL_I: | |
1978 | case R_RISCV_TPREL_S: | |
e23eba97 NC |
1979 | relocation = tpoff (info, relocation); |
1980 | if (VALID_ITYPE_IMM (relocation + rel->r_addend)) | |
1981 | { | |
1982 | /* We can use tp as the base register. */ | |
1983 | bfd_vma insn = bfd_get_32 (input_bfd, contents + rel->r_offset); | |
1984 | insn &= ~(OP_MASK_RS1 << OP_SH_RS1); | |
1985 | insn |= X_TP << OP_SH_RS1; | |
1986 | bfd_put_32 (input_bfd, insn, contents + rel->r_offset); | |
1987 | } | |
45f76423 AW |
1988 | else |
1989 | r = bfd_reloc_overflow; | |
e23eba97 NC |
1990 | break; |
1991 | ||
1992 | case R_RISCV_GPREL_I: | |
1993 | case R_RISCV_GPREL_S: | |
1994 | { | |
1995 | bfd_vma gp = riscv_global_pointer_value (info); | |
1996 | bfd_boolean x0_base = VALID_ITYPE_IMM (relocation + rel->r_addend); | |
1997 | if (x0_base || VALID_ITYPE_IMM (relocation + rel->r_addend - gp)) | |
1998 | { | |
1999 | /* We can use x0 or gp as the base register. */ | |
2000 | bfd_vma insn = bfd_get_32 (input_bfd, contents + rel->r_offset); | |
2001 | insn &= ~(OP_MASK_RS1 << OP_SH_RS1); | |
2002 | if (!x0_base) | |
2003 | { | |
2004 | rel->r_addend -= gp; | |
2005 | insn |= X_GP << OP_SH_RS1; | |
2006 | } | |
2007 | bfd_put_32 (input_bfd, insn, contents + rel->r_offset); | |
2008 | } | |
2009 | else | |
2010 | r = bfd_reloc_overflow; | |
2011 | break; | |
2012 | } | |
2013 | ||
2014 | case R_RISCV_PCREL_HI20: | |
b1308d2c PD |
2015 | absolute = riscv_zero_pcrel_hi_reloc (rel, |
2016 | info, | |
2017 | pc, | |
2018 | relocation, | |
2019 | contents, | |
2020 | howto, | |
2021 | input_bfd); | |
2022 | r_type = ELFNN_R_TYPE (rel->r_info); | |
0aa13fee | 2023 | howto = riscv_elf_rtype_to_howto (input_bfd, r_type); |
f3185997 NC |
2024 | if (howto == NULL) |
2025 | r = bfd_reloc_notsupported; | |
2026 | else if (!riscv_record_pcrel_hi_reloc (&pcrel_relocs, pc, | |
2027 | relocation + rel->r_addend, | |
2028 | absolute)) | |
e23eba97 NC |
2029 | r = bfd_reloc_overflow; |
2030 | break; | |
2031 | ||
2032 | case R_RISCV_PCREL_LO12_I: | |
2033 | case R_RISCV_PCREL_LO12_S: | |
551703cf JW |
2034 | /* We don't allow section symbols plus addends as the auipc address, |
2035 | because then riscv_relax_delete_bytes would have to search through | |
2036 | all relocs to update these addends. This is also ambiguous, as | |
2037 | we do allow offsets to be added to the target address, which are | |
2038 | not to be used to find the auipc address. */ | |
2039 | if ((ELF_ST_TYPE (sym->st_info) == STT_SECTION) && rel->r_addend) | |
2a0d9853 JW |
2040 | { |
2041 | r = bfd_reloc_dangerous; | |
2042 | break; | |
2043 | } | |
2044 | ||
e23eba97 NC |
2045 | if (riscv_record_pcrel_lo_reloc (&pcrel_relocs, input_section, info, |
2046 | howto, rel, relocation, name, | |
2047 | contents)) | |
2048 | continue; | |
2049 | r = bfd_reloc_overflow; | |
2050 | break; | |
2051 | ||
2052 | case R_RISCV_TLS_DTPREL32: | |
2053 | case R_RISCV_TLS_DTPREL64: | |
2054 | relocation = dtpoff (info, relocation); | |
2055 | break; | |
2056 | ||
2057 | case R_RISCV_32: | |
2058 | case R_RISCV_64: | |
2059 | if ((input_section->flags & SEC_ALLOC) == 0) | |
2060 | break; | |
2061 | ||
2062 | if ((bfd_link_pic (info) | |
2063 | && (h == NULL | |
6487709f JW |
2064 | || (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
2065 | && !resolved_to_zero) | |
e23eba97 NC |
2066 | || h->root.type != bfd_link_hash_undefweak) |
2067 | && (! howto->pc_relative | |
2068 | || !SYMBOL_CALLS_LOCAL (info, h))) | |
2069 | || (!bfd_link_pic (info) | |
2070 | && h != NULL | |
2071 | && h->dynindx != -1 | |
2072 | && !h->non_got_ref | |
2073 | && ((h->def_dynamic | |
2074 | && !h->def_regular) | |
2075 | || h->root.type == bfd_link_hash_undefweak | |
2076 | || h->root.type == bfd_link_hash_undefined))) | |
2077 | { | |
2078 | Elf_Internal_Rela outrel; | |
2079 | bfd_boolean skip_static_relocation, skip_dynamic_relocation; | |
2080 | ||
2081 | /* When generating a shared object, these relocations | |
2082 | are copied into the output file to be resolved at run | |
2083 | time. */ | |
2084 | ||
2085 | outrel.r_offset = | |
2086 | _bfd_elf_section_offset (output_bfd, info, input_section, | |
2087 | rel->r_offset); | |
2088 | skip_static_relocation = outrel.r_offset != (bfd_vma) -2; | |
2089 | skip_dynamic_relocation = outrel.r_offset >= (bfd_vma) -2; | |
2090 | outrel.r_offset += sec_addr (input_section); | |
2091 | ||
2092 | if (skip_dynamic_relocation) | |
2093 | memset (&outrel, 0, sizeof outrel); | |
2094 | else if (h != NULL && h->dynindx != -1 | |
2095 | && !(bfd_link_pic (info) | |
2096 | && SYMBOLIC_BIND (info, h) | |
2097 | && h->def_regular)) | |
2098 | { | |
2099 | outrel.r_info = ELFNN_R_INFO (h->dynindx, r_type); | |
2100 | outrel.r_addend = rel->r_addend; | |
2101 | } | |
2102 | else | |
2103 | { | |
2104 | outrel.r_info = ELFNN_R_INFO (0, R_RISCV_RELATIVE); | |
2105 | outrel.r_addend = relocation + rel->r_addend; | |
2106 | } | |
2107 | ||
2108 | riscv_elf_append_rela (output_bfd, sreloc, &outrel); | |
2109 | if (skip_static_relocation) | |
2110 | continue; | |
2111 | } | |
2112 | break; | |
2113 | ||
2114 | case R_RISCV_TLS_GOT_HI20: | |
2115 | is_ie = TRUE; | |
2116 | /* Fall through. */ | |
2117 | ||
2118 | case R_RISCV_TLS_GD_HI20: | |
2119 | if (h != NULL) | |
2120 | { | |
2121 | off = h->got.offset; | |
2122 | h->got.offset |= 1; | |
2123 | } | |
2124 | else | |
2125 | { | |
2126 | off = local_got_offsets[r_symndx]; | |
2127 | local_got_offsets[r_symndx] |= 1; | |
2128 | } | |
2129 | ||
2130 | tls_type = _bfd_riscv_elf_tls_type (input_bfd, h, r_symndx); | |
2131 | BFD_ASSERT (tls_type & (GOT_TLS_IE | GOT_TLS_GD)); | |
2132 | /* If this symbol is referenced by both GD and IE TLS, the IE | |
2133 | reference's GOT slot follows the GD reference's slots. */ | |
2134 | ie_off = 0; | |
2135 | if ((tls_type & GOT_TLS_GD) && (tls_type & GOT_TLS_IE)) | |
2136 | ie_off = 2 * GOT_ENTRY_SIZE; | |
2137 | ||
2138 | if ((off & 1) != 0) | |
2139 | off &= ~1; | |
2140 | else | |
2141 | { | |
2142 | Elf_Internal_Rela outrel; | |
2143 | int indx = 0; | |
2144 | bfd_boolean need_relocs = FALSE; | |
2145 | ||
2146 | if (htab->elf.srelgot == NULL) | |
2147 | abort (); | |
2148 | ||
2149 | if (h != NULL) | |
2150 | { | |
2151 | bfd_boolean dyn, pic; | |
2152 | dyn = htab->elf.dynamic_sections_created; | |
2153 | pic = bfd_link_pic (info); | |
2154 | ||
2155 | if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, pic, h) | |
2156 | && (!pic || !SYMBOL_REFERENCES_LOCAL (info, h))) | |
2157 | indx = h->dynindx; | |
2158 | } | |
2159 | ||
2160 | /* The GOT entries have not been initialized yet. Do it | |
07d6d2b8 | 2161 | now, and emit any relocations. */ |
e23eba97 NC |
2162 | if ((bfd_link_pic (info) || indx != 0) |
2163 | && (h == NULL | |
2164 | || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT | |
2165 | || h->root.type != bfd_link_hash_undefweak)) | |
2166 | need_relocs = TRUE; | |
2167 | ||
2168 | if (tls_type & GOT_TLS_GD) | |
2169 | { | |
2170 | if (need_relocs) | |
2171 | { | |
2172 | outrel.r_offset = sec_addr (htab->elf.sgot) + off; | |
2173 | outrel.r_addend = 0; | |
2174 | outrel.r_info = ELFNN_R_INFO (indx, R_RISCV_TLS_DTPMODNN); | |
2175 | bfd_put_NN (output_bfd, 0, | |
2176 | htab->elf.sgot->contents + off); | |
2177 | riscv_elf_append_rela (output_bfd, htab->elf.srelgot, &outrel); | |
2178 | if (indx == 0) | |
2179 | { | |
2180 | BFD_ASSERT (! unresolved_reloc); | |
2181 | bfd_put_NN (output_bfd, | |
2182 | dtpoff (info, relocation), | |
2183 | (htab->elf.sgot->contents + off + | |
2184 | RISCV_ELF_WORD_BYTES)); | |
2185 | } | |
2186 | else | |
2187 | { | |
2188 | bfd_put_NN (output_bfd, 0, | |
2189 | (htab->elf.sgot->contents + off + | |
2190 | RISCV_ELF_WORD_BYTES)); | |
2191 | outrel.r_info = ELFNN_R_INFO (indx, R_RISCV_TLS_DTPRELNN); | |
2192 | outrel.r_offset += RISCV_ELF_WORD_BYTES; | |
2193 | riscv_elf_append_rela (output_bfd, htab->elf.srelgot, &outrel); | |
2194 | } | |
2195 | } | |
2196 | else | |
2197 | { | |
2198 | /* If we are not emitting relocations for a | |
2199 | general dynamic reference, then we must be in a | |
2200 | static link or an executable link with the | |
2201 | symbol binding locally. Mark it as belonging | |
2202 | to module 1, the executable. */ | |
2203 | bfd_put_NN (output_bfd, 1, | |
2204 | htab->elf.sgot->contents + off); | |
2205 | bfd_put_NN (output_bfd, | |
2206 | dtpoff (info, relocation), | |
2207 | (htab->elf.sgot->contents + off + | |
2208 | RISCV_ELF_WORD_BYTES)); | |
2209 | } | |
2210 | } | |
2211 | ||
2212 | if (tls_type & GOT_TLS_IE) | |
2213 | { | |
2214 | if (need_relocs) | |
2215 | { | |
2216 | bfd_put_NN (output_bfd, 0, | |
2217 | htab->elf.sgot->contents + off + ie_off); | |
2218 | outrel.r_offset = sec_addr (htab->elf.sgot) | |
2219 | + off + ie_off; | |
2220 | outrel.r_addend = 0; | |
2221 | if (indx == 0) | |
2222 | outrel.r_addend = tpoff (info, relocation); | |
2223 | outrel.r_info = ELFNN_R_INFO (indx, R_RISCV_TLS_TPRELNN); | |
2224 | riscv_elf_append_rela (output_bfd, htab->elf.srelgot, &outrel); | |
2225 | } | |
2226 | else | |
2227 | { | |
2228 | bfd_put_NN (output_bfd, tpoff (info, relocation), | |
2229 | htab->elf.sgot->contents + off + ie_off); | |
2230 | } | |
2231 | } | |
2232 | } | |
2233 | ||
2234 | BFD_ASSERT (off < (bfd_vma) -2); | |
2235 | relocation = sec_addr (htab->elf.sgot) + off + (is_ie ? ie_off : 0); | |
b1308d2c PD |
2236 | if (!riscv_record_pcrel_hi_reloc (&pcrel_relocs, pc, |
2237 | relocation, FALSE)) | |
e23eba97 NC |
2238 | r = bfd_reloc_overflow; |
2239 | unresolved_reloc = FALSE; | |
2240 | break; | |
2241 | ||
2242 | default: | |
2243 | r = bfd_reloc_notsupported; | |
2244 | } | |
2245 | ||
2246 | /* Dynamic relocs are not propagated for SEC_DEBUGGING sections | |
2247 | because such sections are not SEC_ALLOC and thus ld.so will | |
2248 | not process them. */ | |
2249 | if (unresolved_reloc | |
2250 | && !((input_section->flags & SEC_DEBUGGING) != 0 | |
2251 | && h->def_dynamic) | |
2252 | && _bfd_elf_section_offset (output_bfd, info, input_section, | |
2253 | rel->r_offset) != (bfd_vma) -1) | |
2254 | { | |
2255 | (*_bfd_error_handler) | |
2dcf00ce AM |
2256 | (_("%pB(%pA+%#" PRIx64 "): " |
2257 | "unresolvable %s relocation against symbol `%s'"), | |
e23eba97 NC |
2258 | input_bfd, |
2259 | input_section, | |
2dcf00ce | 2260 | (uint64_t) rel->r_offset, |
e23eba97 NC |
2261 | howto->name, |
2262 | h->root.root.string); | |
2263 | continue; | |
2264 | } | |
2265 | ||
2266 | if (r == bfd_reloc_ok) | |
2267 | r = perform_relocation (howto, rel, relocation, input_section, | |
2268 | input_bfd, contents); | |
2269 | ||
2270 | switch (r) | |
2271 | { | |
2272 | case bfd_reloc_ok: | |
2273 | continue; | |
2274 | ||
2275 | case bfd_reloc_overflow: | |
2276 | info->callbacks->reloc_overflow | |
2277 | (info, (h ? &h->root : NULL), name, howto->name, | |
2278 | (bfd_vma) 0, input_bfd, input_section, rel->r_offset); | |
2279 | break; | |
2280 | ||
2281 | case bfd_reloc_undefined: | |
2282 | info->callbacks->undefined_symbol | |
2283 | (info, name, input_bfd, input_section, rel->r_offset, | |
2284 | TRUE); | |
2285 | break; | |
2286 | ||
2287 | case bfd_reloc_outofrange: | |
2a0d9853 | 2288 | msg = _("%X%P: internal error: out of range error\n"); |
e23eba97 NC |
2289 | break; |
2290 | ||
2291 | case bfd_reloc_notsupported: | |
2a0d9853 | 2292 | msg = _("%X%P: internal error: unsupported relocation error\n"); |
e23eba97 NC |
2293 | break; |
2294 | ||
2295 | case bfd_reloc_dangerous: | |
2a0d9853 | 2296 | info->callbacks->reloc_dangerous |
551703cf JW |
2297 | (info, "%pcrel_lo section symbol with an addend", input_bfd, |
2298 | input_section, rel->r_offset); | |
e23eba97 NC |
2299 | break; |
2300 | ||
2301 | default: | |
2a0d9853 | 2302 | msg = _("%X%P: internal error: unknown error\n"); |
e23eba97 NC |
2303 | break; |
2304 | } | |
2305 | ||
2306 | if (msg) | |
2a0d9853 JW |
2307 | info->callbacks->einfo (msg); |
2308 | ||
3f48fe4a JW |
2309 | /* We already reported the error via a callback, so don't try to report |
2310 | it again by returning false. That leads to spurious errors. */ | |
ed01220c | 2311 | ret = TRUE; |
e23eba97 NC |
2312 | goto out; |
2313 | } | |
2314 | ||
2315 | ret = riscv_resolve_pcrel_lo_relocs (&pcrel_relocs); | |
2316 | out: | |
2317 | riscv_free_pcrel_relocs (&pcrel_relocs); | |
2318 | return ret; | |
2319 | } | |
2320 | ||
2321 | /* Finish up dynamic symbol handling. We set the contents of various | |
2322 | dynamic sections here. */ | |
2323 | ||
2324 | static bfd_boolean | |
2325 | riscv_elf_finish_dynamic_symbol (bfd *output_bfd, | |
2326 | struct bfd_link_info *info, | |
2327 | struct elf_link_hash_entry *h, | |
2328 | Elf_Internal_Sym *sym) | |
2329 | { | |
2330 | struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info); | |
2331 | const struct elf_backend_data *bed = get_elf_backend_data (output_bfd); | |
2332 | ||
2333 | if (h->plt.offset != (bfd_vma) -1) | |
2334 | { | |
2335 | /* We've decided to create a PLT entry for this symbol. */ | |
2336 | bfd_byte *loc; | |
2337 | bfd_vma i, header_address, plt_idx, got_address; | |
2338 | uint32_t plt_entry[PLT_ENTRY_INSNS]; | |
2339 | Elf_Internal_Rela rela; | |
2340 | ||
2341 | BFD_ASSERT (h->dynindx != -1); | |
2342 | ||
2343 | /* Calculate the address of the PLT header. */ | |
2344 | header_address = sec_addr (htab->elf.splt); | |
2345 | ||
2346 | /* Calculate the index of the entry. */ | |
2347 | plt_idx = (h->plt.offset - PLT_HEADER_SIZE) / PLT_ENTRY_SIZE; | |
2348 | ||
2349 | /* Calculate the address of the .got.plt entry. */ | |
2350 | got_address = riscv_elf_got_plt_val (plt_idx, info); | |
2351 | ||
2352 | /* Find out where the .plt entry should go. */ | |
2353 | loc = htab->elf.splt->contents + h->plt.offset; | |
2354 | ||
2355 | /* Fill in the PLT entry itself. */ | |
2356 | riscv_make_plt_entry (got_address, header_address + h->plt.offset, | |
2357 | plt_entry); | |
2358 | for (i = 0; i < PLT_ENTRY_INSNS; i++) | |
2359 | bfd_put_32 (output_bfd, plt_entry[i], loc + 4*i); | |
2360 | ||
2361 | /* Fill in the initial value of the .got.plt entry. */ | |
2362 | loc = htab->elf.sgotplt->contents | |
2363 | + (got_address - sec_addr (htab->elf.sgotplt)); | |
2364 | bfd_put_NN (output_bfd, sec_addr (htab->elf.splt), loc); | |
2365 | ||
2366 | /* Fill in the entry in the .rela.plt section. */ | |
2367 | rela.r_offset = got_address; | |
2368 | rela.r_addend = 0; | |
2369 | rela.r_info = ELFNN_R_INFO (h->dynindx, R_RISCV_JUMP_SLOT); | |
2370 | ||
2371 | loc = htab->elf.srelplt->contents + plt_idx * sizeof (ElfNN_External_Rela); | |
2372 | bed->s->swap_reloca_out (output_bfd, &rela, loc); | |
2373 | ||
2374 | if (!h->def_regular) | |
2375 | { | |
2376 | /* Mark the symbol as undefined, rather than as defined in | |
2377 | the .plt section. Leave the value alone. */ | |
2378 | sym->st_shndx = SHN_UNDEF; | |
2379 | /* If the symbol is weak, we do need to clear the value. | |
2380 | Otherwise, the PLT entry would provide a definition for | |
2381 | the symbol even if the symbol wasn't defined anywhere, | |
2382 | and so the symbol would never be NULL. */ | |
2383 | if (!h->ref_regular_nonweak) | |
2384 | sym->st_value = 0; | |
2385 | } | |
2386 | } | |
2387 | ||
2388 | if (h->got.offset != (bfd_vma) -1 | |
6487709f JW |
2389 | && !(riscv_elf_hash_entry (h)->tls_type & (GOT_TLS_GD | GOT_TLS_IE)) |
2390 | && !UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)) | |
e23eba97 NC |
2391 | { |
2392 | asection *sgot; | |
2393 | asection *srela; | |
2394 | Elf_Internal_Rela rela; | |
2395 | ||
2396 | /* This symbol has an entry in the GOT. Set it up. */ | |
2397 | ||
2398 | sgot = htab->elf.sgot; | |
2399 | srela = htab->elf.srelgot; | |
2400 | BFD_ASSERT (sgot != NULL && srela != NULL); | |
2401 | ||
2402 | rela.r_offset = sec_addr (sgot) + (h->got.offset &~ (bfd_vma) 1); | |
2403 | ||
25eb8346 JW |
2404 | /* If this is a local symbol reference, we just want to emit a RELATIVE |
2405 | reloc. This can happen if it is a -Bsymbolic link, or a pie link, or | |
e23eba97 NC |
2406 | the symbol was forced to be local because of a version file. |
2407 | The entry in the global offset table will already have been | |
2408 | initialized in the relocate_section function. */ | |
2409 | if (bfd_link_pic (info) | |
25eb8346 | 2410 | && SYMBOL_REFERENCES_LOCAL (info, h)) |
e23eba97 | 2411 | { |
25eb8346 | 2412 | BFD_ASSERT((h->got.offset & 1) != 0); |
e23eba97 NC |
2413 | asection *sec = h->root.u.def.section; |
2414 | rela.r_info = ELFNN_R_INFO (0, R_RISCV_RELATIVE); | |
2415 | rela.r_addend = (h->root.u.def.value | |
2416 | + sec->output_section->vma | |
2417 | + sec->output_offset); | |
2418 | } | |
2419 | else | |
2420 | { | |
25eb8346 | 2421 | BFD_ASSERT((h->got.offset & 1) == 0); |
e23eba97 NC |
2422 | BFD_ASSERT (h->dynindx != -1); |
2423 | rela.r_info = ELFNN_R_INFO (h->dynindx, R_RISCV_NN); | |
2424 | rela.r_addend = 0; | |
2425 | } | |
2426 | ||
2427 | bfd_put_NN (output_bfd, 0, | |
2428 | sgot->contents + (h->got.offset & ~(bfd_vma) 1)); | |
2429 | riscv_elf_append_rela (output_bfd, srela, &rela); | |
2430 | } | |
2431 | ||
2432 | if (h->needs_copy) | |
2433 | { | |
2434 | Elf_Internal_Rela rela; | |
5474d94f | 2435 | asection *s; |
e23eba97 NC |
2436 | |
2437 | /* This symbols needs a copy reloc. Set it up. */ | |
2438 | BFD_ASSERT (h->dynindx != -1); | |
2439 | ||
2440 | rela.r_offset = sec_addr (h->root.u.def.section) + h->root.u.def.value; | |
2441 | rela.r_info = ELFNN_R_INFO (h->dynindx, R_RISCV_COPY); | |
2442 | rela.r_addend = 0; | |
afbf7e8e | 2443 | if (h->root.u.def.section == htab->elf.sdynrelro) |
5474d94f AM |
2444 | s = htab->elf.sreldynrelro; |
2445 | else | |
2446 | s = htab->elf.srelbss; | |
2447 | riscv_elf_append_rela (output_bfd, s, &rela); | |
e23eba97 NC |
2448 | } |
2449 | ||
2450 | /* Mark some specially defined symbols as absolute. */ | |
2451 | if (h == htab->elf.hdynamic | |
2452 | || (h == htab->elf.hgot || h == htab->elf.hplt)) | |
2453 | sym->st_shndx = SHN_ABS; | |
2454 | ||
2455 | return TRUE; | |
2456 | } | |
2457 | ||
2458 | /* Finish up the dynamic sections. */ | |
2459 | ||
2460 | static bfd_boolean | |
2461 | riscv_finish_dyn (bfd *output_bfd, struct bfd_link_info *info, | |
2462 | bfd *dynobj, asection *sdyn) | |
2463 | { | |
2464 | struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info); | |
2465 | const struct elf_backend_data *bed = get_elf_backend_data (output_bfd); | |
2466 | size_t dynsize = bed->s->sizeof_dyn; | |
2467 | bfd_byte *dyncon, *dynconend; | |
2468 | ||
2469 | dynconend = sdyn->contents + sdyn->size; | |
2470 | for (dyncon = sdyn->contents; dyncon < dynconend; dyncon += dynsize) | |
2471 | { | |
2472 | Elf_Internal_Dyn dyn; | |
2473 | asection *s; | |
2474 | ||
2475 | bed->s->swap_dyn_in (dynobj, dyncon, &dyn); | |
2476 | ||
2477 | switch (dyn.d_tag) | |
2478 | { | |
2479 | case DT_PLTGOT: | |
2480 | s = htab->elf.sgotplt; | |
2481 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; | |
2482 | break; | |
2483 | case DT_JMPREL: | |
2484 | s = htab->elf.srelplt; | |
2485 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; | |
2486 | break; | |
2487 | case DT_PLTRELSZ: | |
2488 | s = htab->elf.srelplt; | |
2489 | dyn.d_un.d_val = s->size; | |
2490 | break; | |
2491 | default: | |
2492 | continue; | |
2493 | } | |
2494 | ||
2495 | bed->s->swap_dyn_out (output_bfd, &dyn, dyncon); | |
2496 | } | |
2497 | return TRUE; | |
2498 | } | |
2499 | ||
2500 | static bfd_boolean | |
2501 | riscv_elf_finish_dynamic_sections (bfd *output_bfd, | |
2502 | struct bfd_link_info *info) | |
2503 | { | |
2504 | bfd *dynobj; | |
2505 | asection *sdyn; | |
2506 | struct riscv_elf_link_hash_table *htab; | |
2507 | ||
2508 | htab = riscv_elf_hash_table (info); | |
2509 | BFD_ASSERT (htab != NULL); | |
2510 | dynobj = htab->elf.dynobj; | |
2511 | ||
2512 | sdyn = bfd_get_linker_section (dynobj, ".dynamic"); | |
2513 | ||
2514 | if (elf_hash_table (info)->dynamic_sections_created) | |
2515 | { | |
2516 | asection *splt; | |
2517 | bfd_boolean ret; | |
2518 | ||
2519 | splt = htab->elf.splt; | |
2520 | BFD_ASSERT (splt != NULL && sdyn != NULL); | |
2521 | ||
2522 | ret = riscv_finish_dyn (output_bfd, info, dynobj, sdyn); | |
2523 | ||
535b785f | 2524 | if (!ret) |
e23eba97 NC |
2525 | return ret; |
2526 | ||
2527 | /* Fill in the head and tail entries in the procedure linkage table. */ | |
2528 | if (splt->size > 0) | |
2529 | { | |
2530 | int i; | |
2531 | uint32_t plt_header[PLT_HEADER_INSNS]; | |
2532 | riscv_make_plt_header (sec_addr (htab->elf.sgotplt), | |
2533 | sec_addr (splt), plt_header); | |
2534 | ||
2535 | for (i = 0; i < PLT_HEADER_INSNS; i++) | |
2536 | bfd_put_32 (output_bfd, plt_header[i], splt->contents + 4*i); | |
e23eba97 | 2537 | |
cc162427 AW |
2538 | elf_section_data (splt->output_section)->this_hdr.sh_entsize |
2539 | = PLT_ENTRY_SIZE; | |
2540 | } | |
e23eba97 NC |
2541 | } |
2542 | ||
2543 | if (htab->elf.sgotplt) | |
2544 | { | |
2545 | asection *output_section = htab->elf.sgotplt->output_section; | |
2546 | ||
2547 | if (bfd_is_abs_section (output_section)) | |
2548 | { | |
2549 | (*_bfd_error_handler) | |
871b3ab2 | 2550 | (_("discarded output section: `%pA'"), htab->elf.sgotplt); |
e23eba97 NC |
2551 | return FALSE; |
2552 | } | |
2553 | ||
2554 | if (htab->elf.sgotplt->size > 0) | |
2555 | { | |
2556 | /* Write the first two entries in .got.plt, needed for the dynamic | |
2557 | linker. */ | |
2558 | bfd_put_NN (output_bfd, (bfd_vma) -1, htab->elf.sgotplt->contents); | |
2559 | bfd_put_NN (output_bfd, (bfd_vma) 0, | |
2560 | htab->elf.sgotplt->contents + GOT_ENTRY_SIZE); | |
2561 | } | |
2562 | ||
2563 | elf_section_data (output_section)->this_hdr.sh_entsize = GOT_ENTRY_SIZE; | |
2564 | } | |
2565 | ||
2566 | if (htab->elf.sgot) | |
2567 | { | |
2568 | asection *output_section = htab->elf.sgot->output_section; | |
2569 | ||
2570 | if (htab->elf.sgot->size > 0) | |
2571 | { | |
2572 | /* Set the first entry in the global offset table to the address of | |
2573 | the dynamic section. */ | |
2574 | bfd_vma val = sdyn ? sec_addr (sdyn) : 0; | |
2575 | bfd_put_NN (output_bfd, val, htab->elf.sgot->contents); | |
2576 | } | |
2577 | ||
2578 | elf_section_data (output_section)->this_hdr.sh_entsize = GOT_ENTRY_SIZE; | |
2579 | } | |
2580 | ||
2581 | return TRUE; | |
2582 | } | |
2583 | ||
2584 | /* Return address for Ith PLT stub in section PLT, for relocation REL | |
2585 | or (bfd_vma) -1 if it should not be included. */ | |
2586 | ||
2587 | static bfd_vma | |
2588 | riscv_elf_plt_sym_val (bfd_vma i, const asection *plt, | |
2589 | const arelent *rel ATTRIBUTE_UNUSED) | |
2590 | { | |
2591 | return plt->vma + PLT_HEADER_SIZE + i * PLT_ENTRY_SIZE; | |
2592 | } | |
2593 | ||
2594 | static enum elf_reloc_type_class | |
2595 | riscv_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED, | |
2596 | const asection *rel_sec ATTRIBUTE_UNUSED, | |
2597 | const Elf_Internal_Rela *rela) | |
2598 | { | |
2599 | switch (ELFNN_R_TYPE (rela->r_info)) | |
2600 | { | |
2601 | case R_RISCV_RELATIVE: | |
2602 | return reloc_class_relative; | |
2603 | case R_RISCV_JUMP_SLOT: | |
2604 | return reloc_class_plt; | |
2605 | case R_RISCV_COPY: | |
2606 | return reloc_class_copy; | |
2607 | default: | |
2608 | return reloc_class_normal; | |
2609 | } | |
2610 | } | |
2611 | ||
2612 | /* Merge backend specific data from an object file to the output | |
2613 | object file when linking. */ | |
2614 | ||
2615 | static bfd_boolean | |
2616 | _bfd_riscv_elf_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info) | |
2617 | { | |
2618 | bfd *obfd = info->output_bfd; | |
2619 | flagword new_flags = elf_elfheader (ibfd)->e_flags; | |
2620 | flagword old_flags = elf_elfheader (obfd)->e_flags; | |
2621 | ||
2622 | if (!is_riscv_elf (ibfd) || !is_riscv_elf (obfd)) | |
2623 | return TRUE; | |
2624 | ||
2625 | if (strcmp (bfd_get_target (ibfd), bfd_get_target (obfd)) != 0) | |
2626 | { | |
2627 | (*_bfd_error_handler) | |
871b3ab2 | 2628 | (_("%pB: ABI is incompatible with that of the selected emulation:\n" |
96b0927d PD |
2629 | " target emulation `%s' does not match `%s'"), |
2630 | ibfd, bfd_get_target (ibfd), bfd_get_target (obfd)); | |
e23eba97 NC |
2631 | return FALSE; |
2632 | } | |
2633 | ||
2634 | if (!_bfd_elf_merge_object_attributes (ibfd, info)) | |
2635 | return FALSE; | |
2636 | ||
2637 | if (! elf_flags_init (obfd)) | |
2638 | { | |
2639 | elf_flags_init (obfd) = TRUE; | |
2640 | elf_elfheader (obfd)->e_flags = new_flags; | |
2641 | return TRUE; | |
2642 | } | |
2643 | ||
2922d21d AW |
2644 | /* Disallow linking different float ABIs. */ |
2645 | if ((old_flags ^ new_flags) & EF_RISCV_FLOAT_ABI) | |
e23eba97 NC |
2646 | { |
2647 | (*_bfd_error_handler) | |
871b3ab2 | 2648 | (_("%pB: can't link hard-float modules with soft-float modules"), ibfd); |
e23eba97 NC |
2649 | goto fail; |
2650 | } | |
2651 | ||
7f999549 JW |
2652 | /* Disallow linking RVE and non-RVE. */ |
2653 | if ((old_flags ^ new_flags) & EF_RISCV_RVE) | |
2654 | { | |
2655 | (*_bfd_error_handler) | |
2656 | (_("%pB: can't link RVE with other target"), ibfd); | |
2657 | goto fail; | |
2658 | } | |
2659 | ||
e23eba97 NC |
2660 | /* Allow linking RVC and non-RVC, and keep the RVC flag. */ |
2661 | elf_elfheader (obfd)->e_flags |= new_flags & EF_RISCV_RVC; | |
2662 | ||
2663 | return TRUE; | |
2664 | ||
2665 | fail: | |
2666 | bfd_set_error (bfd_error_bad_value); | |
2667 | return FALSE; | |
2668 | } | |
2669 | ||
2670 | /* Delete some bytes from a section while relaxing. */ | |
2671 | ||
2672 | static bfd_boolean | |
7f02625e JW |
2673 | riscv_relax_delete_bytes (bfd *abfd, asection *sec, bfd_vma addr, size_t count, |
2674 | struct bfd_link_info *link_info) | |
e23eba97 NC |
2675 | { |
2676 | unsigned int i, symcount; | |
2677 | bfd_vma toaddr = sec->size; | |
2678 | struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (abfd); | |
2679 | Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
2680 | unsigned int sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); | |
2681 | struct bfd_elf_section_data *data = elf_section_data (sec); | |
2682 | bfd_byte *contents = data->this_hdr.contents; | |
2683 | ||
2684 | /* Actually delete the bytes. */ | |
2685 | sec->size -= count; | |
2686 | memmove (contents + addr, contents + addr + count, toaddr - addr - count); | |
2687 | ||
2688 | /* Adjust the location of all of the relocs. Note that we need not | |
2689 | adjust the addends, since all PC-relative references must be against | |
2690 | symbols, which we will adjust below. */ | |
2691 | for (i = 0; i < sec->reloc_count; i++) | |
2692 | if (data->relocs[i].r_offset > addr && data->relocs[i].r_offset < toaddr) | |
2693 | data->relocs[i].r_offset -= count; | |
2694 | ||
2695 | /* Adjust the local symbols defined in this section. */ | |
2696 | for (i = 0; i < symtab_hdr->sh_info; i++) | |
2697 | { | |
2698 | Elf_Internal_Sym *sym = (Elf_Internal_Sym *) symtab_hdr->contents + i; | |
2699 | if (sym->st_shndx == sec_shndx) | |
2700 | { | |
2701 | /* If the symbol is in the range of memory we just moved, we | |
2702 | have to adjust its value. */ | |
2703 | if (sym->st_value > addr && sym->st_value <= toaddr) | |
2704 | sym->st_value -= count; | |
2705 | ||
2706 | /* If the symbol *spans* the bytes we just deleted (i.e. its | |
2707 | *end* is in the moved bytes but its *start* isn't), then we | |
788af978 JW |
2708 | must adjust its size. |
2709 | ||
2710 | This test needs to use the original value of st_value, otherwise | |
2711 | we might accidentally decrease size when deleting bytes right | |
2712 | before the symbol. But since deleted relocs can't span across | |
2713 | symbols, we can't have both a st_value and a st_size decrease, | |
2714 | so it is simpler to just use an else. */ | |
2715 | else if (sym->st_value <= addr | |
2716 | && sym->st_value + sym->st_size > addr | |
2717 | && sym->st_value + sym->st_size <= toaddr) | |
e23eba97 NC |
2718 | sym->st_size -= count; |
2719 | } | |
2720 | } | |
2721 | ||
2722 | /* Now adjust the global symbols defined in this section. */ | |
2723 | symcount = ((symtab_hdr->sh_size / sizeof (ElfNN_External_Sym)) | |
2724 | - symtab_hdr->sh_info); | |
2725 | ||
2726 | for (i = 0; i < symcount; i++) | |
2727 | { | |
2728 | struct elf_link_hash_entry *sym_hash = sym_hashes[i]; | |
2729 | ||
7f02625e JW |
2730 | /* The '--wrap SYMBOL' option is causing a pain when the object file, |
2731 | containing the definition of __wrap_SYMBOL, includes a direct | |
2732 | call to SYMBOL as well. Since both __wrap_SYMBOL and SYMBOL reference | |
2733 | the same symbol (which is __wrap_SYMBOL), but still exist as two | |
2734 | different symbols in 'sym_hashes', we don't want to adjust | |
137b5cbd JW |
2735 | the global symbol __wrap_SYMBOL twice. */ |
2736 | /* The same problem occurs with symbols that are versioned_hidden, as | |
2737 | foo becomes an alias for foo@BAR, and hence they need the same | |
2738 | treatment. */ | |
2739 | if (link_info->wrap_hash != NULL | |
2740 | || sym_hash->versioned == versioned_hidden) | |
7f02625e JW |
2741 | { |
2742 | struct elf_link_hash_entry **cur_sym_hashes; | |
2743 | ||
2744 | /* Loop only over the symbols which have already been checked. */ | |
2745 | for (cur_sym_hashes = sym_hashes; cur_sym_hashes < &sym_hashes[i]; | |
2746 | cur_sym_hashes++) | |
2747 | { | |
2748 | /* If the current symbol is identical to 'sym_hash', that means | |
2749 | the symbol was already adjusted (or at least checked). */ | |
2750 | if (*cur_sym_hashes == sym_hash) | |
2751 | break; | |
2752 | } | |
2753 | /* Don't adjust the symbol again. */ | |
2754 | if (cur_sym_hashes < &sym_hashes[i]) | |
2755 | continue; | |
2756 | } | |
2757 | ||
e23eba97 NC |
2758 | if ((sym_hash->root.type == bfd_link_hash_defined |
2759 | || sym_hash->root.type == bfd_link_hash_defweak) | |
2760 | && sym_hash->root.u.def.section == sec) | |
2761 | { | |
2762 | /* As above, adjust the value if needed. */ | |
2763 | if (sym_hash->root.u.def.value > addr | |
2764 | && sym_hash->root.u.def.value <= toaddr) | |
2765 | sym_hash->root.u.def.value -= count; | |
2766 | ||
2767 | /* As above, adjust the size if needed. */ | |
788af978 JW |
2768 | else if (sym_hash->root.u.def.value <= addr |
2769 | && sym_hash->root.u.def.value + sym_hash->size > addr | |
2770 | && sym_hash->root.u.def.value + sym_hash->size <= toaddr) | |
e23eba97 NC |
2771 | sym_hash->size -= count; |
2772 | } | |
2773 | } | |
2774 | ||
2775 | return TRUE; | |
2776 | } | |
2777 | ||
9d06997a PD |
2778 | /* A second format for recording PC-relative hi relocations. This stores the |
2779 | information required to relax them to GP-relative addresses. */ | |
2780 | ||
2781 | typedef struct riscv_pcgp_hi_reloc riscv_pcgp_hi_reloc; | |
2782 | struct riscv_pcgp_hi_reloc | |
2783 | { | |
2784 | bfd_vma hi_sec_off; | |
2785 | bfd_vma hi_addend; | |
2786 | bfd_vma hi_addr; | |
2787 | unsigned hi_sym; | |
2788 | asection *sym_sec; | |
2789 | riscv_pcgp_hi_reloc *next; | |
2790 | }; | |
2791 | ||
2792 | typedef struct riscv_pcgp_lo_reloc riscv_pcgp_lo_reloc; | |
2793 | struct riscv_pcgp_lo_reloc | |
2794 | { | |
2795 | bfd_vma hi_sec_off; | |
2796 | riscv_pcgp_lo_reloc *next; | |
2797 | }; | |
2798 | ||
2799 | typedef struct | |
2800 | { | |
2801 | riscv_pcgp_hi_reloc *hi; | |
2802 | riscv_pcgp_lo_reloc *lo; | |
2803 | } riscv_pcgp_relocs; | |
2804 | ||
2805 | static bfd_boolean | |
2806 | riscv_init_pcgp_relocs (riscv_pcgp_relocs *p) | |
2807 | { | |
2808 | p->hi = NULL; | |
2809 | p->lo = NULL; | |
2810 | return TRUE; | |
2811 | } | |
2812 | ||
2813 | static void | |
2814 | riscv_free_pcgp_relocs (riscv_pcgp_relocs *p, | |
2815 | bfd *abfd ATTRIBUTE_UNUSED, | |
2816 | asection *sec ATTRIBUTE_UNUSED) | |
2817 | { | |
2818 | riscv_pcgp_hi_reloc *c; | |
2819 | riscv_pcgp_lo_reloc *l; | |
2820 | ||
2821 | for (c = p->hi; c != NULL;) | |
2822 | { | |
2823 | riscv_pcgp_hi_reloc *next = c->next; | |
2824 | free (c); | |
2825 | c = next; | |
2826 | } | |
2827 | ||
2828 | for (l = p->lo; l != NULL;) | |
2829 | { | |
2830 | riscv_pcgp_lo_reloc *next = l->next; | |
2831 | free (l); | |
2832 | l = next; | |
2833 | } | |
2834 | } | |
2835 | ||
2836 | static bfd_boolean | |
2837 | riscv_record_pcgp_hi_reloc (riscv_pcgp_relocs *p, bfd_vma hi_sec_off, | |
2838 | bfd_vma hi_addend, bfd_vma hi_addr, | |
2839 | unsigned hi_sym, asection *sym_sec) | |
2840 | { | |
2841 | riscv_pcgp_hi_reloc *new = bfd_malloc (sizeof(*new)); | |
2842 | if (!new) | |
2843 | return FALSE; | |
2844 | new->hi_sec_off = hi_sec_off; | |
2845 | new->hi_addend = hi_addend; | |
2846 | new->hi_addr = hi_addr; | |
2847 | new->hi_sym = hi_sym; | |
2848 | new->sym_sec = sym_sec; | |
2849 | new->next = p->hi; | |
2850 | p->hi = new; | |
2851 | return TRUE; | |
2852 | } | |
2853 | ||
2854 | static riscv_pcgp_hi_reloc * | |
2855 | riscv_find_pcgp_hi_reloc(riscv_pcgp_relocs *p, bfd_vma hi_sec_off) | |
2856 | { | |
2857 | riscv_pcgp_hi_reloc *c; | |
2858 | ||
2859 | for (c = p->hi; c != NULL; c = c->next) | |
2860 | if (c->hi_sec_off == hi_sec_off) | |
2861 | return c; | |
2862 | return NULL; | |
2863 | } | |
2864 | ||
2865 | static bfd_boolean | |
2866 | riscv_delete_pcgp_hi_reloc(riscv_pcgp_relocs *p, bfd_vma hi_sec_off) | |
2867 | { | |
2868 | bfd_boolean out = FALSE; | |
2869 | riscv_pcgp_hi_reloc *c; | |
2870 | ||
2871 | for (c = p->hi; c != NULL; c = c->next) | |
2872 | if (c->hi_sec_off == hi_sec_off) | |
2873 | out = TRUE; | |
2874 | ||
2875 | return out; | |
2876 | } | |
2877 | ||
2878 | static bfd_boolean | |
2879 | riscv_use_pcgp_hi_reloc(riscv_pcgp_relocs *p, bfd_vma hi_sec_off) | |
2880 | { | |
2881 | bfd_boolean out = FALSE; | |
2882 | riscv_pcgp_hi_reloc *c; | |
2883 | ||
2884 | for (c = p->hi; c != NULL; c = c->next) | |
2885 | if (c->hi_sec_off == hi_sec_off) | |
2886 | out = TRUE; | |
2887 | ||
2888 | return out; | |
2889 | } | |
2890 | ||
2891 | static bfd_boolean | |
2892 | riscv_record_pcgp_lo_reloc (riscv_pcgp_relocs *p, bfd_vma hi_sec_off) | |
2893 | { | |
2894 | riscv_pcgp_lo_reloc *new = bfd_malloc (sizeof(*new)); | |
2895 | if (!new) | |
2896 | return FALSE; | |
2897 | new->hi_sec_off = hi_sec_off; | |
2898 | new->next = p->lo; | |
2899 | p->lo = new; | |
2900 | return TRUE; | |
2901 | } | |
2902 | ||
2903 | static bfd_boolean | |
2904 | riscv_find_pcgp_lo_reloc (riscv_pcgp_relocs *p, bfd_vma hi_sec_off) | |
2905 | { | |
2906 | riscv_pcgp_lo_reloc *c; | |
2907 | ||
2908 | for (c = p->lo; c != NULL; c = c->next) | |
2909 | if (c->hi_sec_off == hi_sec_off) | |
2910 | return TRUE; | |
2911 | return FALSE; | |
2912 | } | |
2913 | ||
2914 | static bfd_boolean | |
2915 | riscv_delete_pcgp_lo_reloc (riscv_pcgp_relocs *p ATTRIBUTE_UNUSED, | |
2916 | bfd_vma lo_sec_off ATTRIBUTE_UNUSED, | |
2917 | size_t bytes ATTRIBUTE_UNUSED) | |
2918 | { | |
2919 | return TRUE; | |
2920 | } | |
2921 | ||
45f76423 AW |
2922 | typedef bfd_boolean (*relax_func_t) (bfd *, asection *, asection *, |
2923 | struct bfd_link_info *, | |
2924 | Elf_Internal_Rela *, | |
9d06997a PD |
2925 | bfd_vma, bfd_vma, bfd_vma, bfd_boolean *, |
2926 | riscv_pcgp_relocs *); | |
45f76423 | 2927 | |
e23eba97 NC |
2928 | /* Relax AUIPC + JALR into JAL. */ |
2929 | ||
2930 | static bfd_boolean | |
2931 | _bfd_riscv_relax_call (bfd *abfd, asection *sec, asection *sym_sec, | |
2932 | struct bfd_link_info *link_info, | |
2933 | Elf_Internal_Rela *rel, | |
2934 | bfd_vma symval, | |
45f76423 AW |
2935 | bfd_vma max_alignment, |
2936 | bfd_vma reserve_size ATTRIBUTE_UNUSED, | |
9d06997a PD |
2937 | bfd_boolean *again, |
2938 | riscv_pcgp_relocs *pcgp_relocs ATTRIBUTE_UNUSED) | |
e23eba97 NC |
2939 | { |
2940 | bfd_byte *contents = elf_section_data (sec)->this_hdr.contents; | |
2941 | bfd_signed_vma foff = symval - (sec_addr (sec) + rel->r_offset); | |
2942 | bfd_boolean near_zero = (symval + RISCV_IMM_REACH/2) < RISCV_IMM_REACH; | |
2943 | bfd_vma auipc, jalr; | |
2944 | int rd, r_type, len = 4, rvc = elf_elfheader (abfd)->e_flags & EF_RISCV_RVC; | |
2945 | ||
2946 | /* If the call crosses section boundaries, an alignment directive could | |
2947 | cause the PC-relative offset to later increase. */ | |
2948 | if (VALID_UJTYPE_IMM (foff) && sym_sec->output_section != sec->output_section) | |
2949 | foff += (foff < 0 ? -max_alignment : max_alignment); | |
2950 | ||
2951 | /* See if this function call can be shortened. */ | |
2952 | if (!VALID_UJTYPE_IMM (foff) && !(!bfd_link_pic (link_info) && near_zero)) | |
2953 | return TRUE; | |
2954 | ||
2955 | /* Shorten the function call. */ | |
2956 | BFD_ASSERT (rel->r_offset + 8 <= sec->size); | |
2957 | ||
2958 | auipc = bfd_get_32 (abfd, contents + rel->r_offset); | |
2959 | jalr = bfd_get_32 (abfd, contents + rel->r_offset + 4); | |
2960 | rd = (jalr >> OP_SH_RD) & OP_MASK_RD; | |
2961 | rvc = rvc && VALID_RVC_J_IMM (foff) && ARCH_SIZE == 32; | |
2962 | ||
2963 | if (rvc && (rd == 0 || rd == X_RA)) | |
2964 | { | |
2965 | /* Relax to C.J[AL] rd, addr. */ | |
2966 | r_type = R_RISCV_RVC_JUMP; | |
2967 | auipc = rd == 0 ? MATCH_C_J : MATCH_C_JAL; | |
2968 | len = 2; | |
2969 | } | |
2970 | else if (VALID_UJTYPE_IMM (foff)) | |
2971 | { | |
2972 | /* Relax to JAL rd, addr. */ | |
2973 | r_type = R_RISCV_JAL; | |
2974 | auipc = MATCH_JAL | (rd << OP_SH_RD); | |
2975 | } | |
2976 | else /* near_zero */ | |
2977 | { | |
2978 | /* Relax to JALR rd, x0, addr. */ | |
2979 | r_type = R_RISCV_LO12_I; | |
2980 | auipc = MATCH_JALR | (rd << OP_SH_RD); | |
2981 | } | |
2982 | ||
2983 | /* Replace the R_RISCV_CALL reloc. */ | |
2984 | rel->r_info = ELFNN_R_INFO (ELFNN_R_SYM (rel->r_info), r_type); | |
2985 | /* Replace the AUIPC. */ | |
2986 | bfd_put (8 * len, abfd, auipc, contents + rel->r_offset); | |
2987 | ||
2988 | /* Delete unnecessary JALR. */ | |
2989 | *again = TRUE; | |
7f02625e JW |
2990 | return riscv_relax_delete_bytes (abfd, sec, rel->r_offset + len, 8 - len, |
2991 | link_info); | |
e23eba97 NC |
2992 | } |
2993 | ||
2994 | /* Traverse all output sections and return the max alignment. */ | |
2995 | ||
1d61f794 | 2996 | static bfd_vma |
e23eba97 NC |
2997 | _bfd_riscv_get_max_alignment (asection *sec) |
2998 | { | |
2999 | unsigned int max_alignment_power = 0; | |
3000 | asection *o; | |
3001 | ||
3002 | for (o = sec->output_section->owner->sections; o != NULL; o = o->next) | |
3003 | { | |
3004 | if (o->alignment_power > max_alignment_power) | |
3005 | max_alignment_power = o->alignment_power; | |
3006 | } | |
3007 | ||
1d61f794 | 3008 | return (bfd_vma) 1 << max_alignment_power; |
e23eba97 NC |
3009 | } |
3010 | ||
3011 | /* Relax non-PIC global variable references. */ | |
3012 | ||
3013 | static bfd_boolean | |
3014 | _bfd_riscv_relax_lui (bfd *abfd, | |
3015 | asection *sec, | |
3016 | asection *sym_sec, | |
3017 | struct bfd_link_info *link_info, | |
3018 | Elf_Internal_Rela *rel, | |
3019 | bfd_vma symval, | |
45f76423 AW |
3020 | bfd_vma max_alignment, |
3021 | bfd_vma reserve_size, | |
9d06997a PD |
3022 | bfd_boolean *again, |
3023 | riscv_pcgp_relocs *pcgp_relocs ATTRIBUTE_UNUSED) | |
e23eba97 NC |
3024 | { |
3025 | bfd_byte *contents = elf_section_data (sec)->this_hdr.contents; | |
3026 | bfd_vma gp = riscv_global_pointer_value (link_info); | |
3027 | int use_rvc = elf_elfheader (abfd)->e_flags & EF_RISCV_RVC; | |
3028 | ||
3029 | /* Mergeable symbols and code might later move out of range. */ | |
3030 | if (sym_sec->flags & (SEC_MERGE | SEC_CODE)) | |
3031 | return TRUE; | |
3032 | ||
3033 | BFD_ASSERT (rel->r_offset + 4 <= sec->size); | |
3034 | ||
d0f744f9 AW |
3035 | if (gp) |
3036 | { | |
3037 | /* If gp and the symbol are in the same output section, then | |
3038 | consider only that section's alignment. */ | |
3039 | struct bfd_link_hash_entry *h = | |
b5292032 PD |
3040 | bfd_link_hash_lookup (link_info->hash, RISCV_GP_SYMBOL, FALSE, FALSE, |
3041 | TRUE); | |
d0f744f9 AW |
3042 | if (h->u.def.section->output_section == sym_sec->output_section) |
3043 | max_alignment = (bfd_vma) 1 << sym_sec->output_section->alignment_power; | |
3044 | } | |
3045 | ||
e23eba97 NC |
3046 | /* Is the reference in range of x0 or gp? |
3047 | Valid gp range conservatively because of alignment issue. */ | |
3048 | if (VALID_ITYPE_IMM (symval) | |
45f76423 AW |
3049 | || (symval >= gp |
3050 | && VALID_ITYPE_IMM (symval - gp + max_alignment + reserve_size)) | |
3051 | || (symval < gp | |
3052 | && VALID_ITYPE_IMM (symval - gp - max_alignment - reserve_size))) | |
e23eba97 NC |
3053 | { |
3054 | unsigned sym = ELFNN_R_SYM (rel->r_info); | |
3055 | switch (ELFNN_R_TYPE (rel->r_info)) | |
3056 | { | |
3057 | case R_RISCV_LO12_I: | |
3058 | rel->r_info = ELFNN_R_INFO (sym, R_RISCV_GPREL_I); | |
3059 | return TRUE; | |
3060 | ||
3061 | case R_RISCV_LO12_S: | |
3062 | rel->r_info = ELFNN_R_INFO (sym, R_RISCV_GPREL_S); | |
3063 | return TRUE; | |
3064 | ||
3065 | case R_RISCV_HI20: | |
3066 | /* We can delete the unnecessary LUI and reloc. */ | |
3067 | rel->r_info = ELFNN_R_INFO (0, R_RISCV_NONE); | |
3068 | *again = TRUE; | |
7f02625e JW |
3069 | return riscv_relax_delete_bytes (abfd, sec, rel->r_offset, 4, |
3070 | link_info); | |
e23eba97 NC |
3071 | |
3072 | default: | |
3073 | abort (); | |
3074 | } | |
3075 | } | |
3076 | ||
3077 | /* Can we relax LUI to C.LUI? Alignment might move the section forward; | |
3078 | account for this assuming page alignment at worst. */ | |
3079 | if (use_rvc | |
3080 | && ELFNN_R_TYPE (rel->r_info) == R_RISCV_HI20 | |
3081 | && VALID_RVC_LUI_IMM (RISCV_CONST_HIGH_PART (symval)) | |
3082 | && VALID_RVC_LUI_IMM (RISCV_CONST_HIGH_PART (symval + ELF_MAXPAGESIZE))) | |
3083 | { | |
3342be5d | 3084 | /* Replace LUI with C.LUI if legal (i.e., rd != x0 and rd != x2/sp). */ |
e23eba97 | 3085 | bfd_vma lui = bfd_get_32 (abfd, contents + rel->r_offset); |
3342be5d AW |
3086 | unsigned rd = ((unsigned)lui >> OP_SH_RD) & OP_MASK_RD; |
3087 | if (rd == 0 || rd == X_SP) | |
e23eba97 NC |
3088 | return TRUE; |
3089 | ||
3090 | lui = (lui & (OP_MASK_RD << OP_SH_RD)) | MATCH_C_LUI; | |
3091 | bfd_put_32 (abfd, lui, contents + rel->r_offset); | |
3092 | ||
3093 | /* Replace the R_RISCV_HI20 reloc. */ | |
3094 | rel->r_info = ELFNN_R_INFO (ELFNN_R_SYM (rel->r_info), R_RISCV_RVC_LUI); | |
3095 | ||
3096 | *again = TRUE; | |
7f02625e JW |
3097 | return riscv_relax_delete_bytes (abfd, sec, rel->r_offset + 2, 2, |
3098 | link_info); | |
e23eba97 NC |
3099 | } |
3100 | ||
3101 | return TRUE; | |
3102 | } | |
3103 | ||
3104 | /* Relax non-PIC TLS references. */ | |
3105 | ||
3106 | static bfd_boolean | |
3107 | _bfd_riscv_relax_tls_le (bfd *abfd, | |
3108 | asection *sec, | |
3109 | asection *sym_sec ATTRIBUTE_UNUSED, | |
3110 | struct bfd_link_info *link_info, | |
3111 | Elf_Internal_Rela *rel, | |
3112 | bfd_vma symval, | |
45f76423 AW |
3113 | bfd_vma max_alignment ATTRIBUTE_UNUSED, |
3114 | bfd_vma reserve_size ATTRIBUTE_UNUSED, | |
9d06997a PD |
3115 | bfd_boolean *again, |
3116 | riscv_pcgp_relocs *prcel_relocs ATTRIBUTE_UNUSED) | |
e23eba97 NC |
3117 | { |
3118 | /* See if this symbol is in range of tp. */ | |
3119 | if (RISCV_CONST_HIGH_PART (tpoff (link_info, symval)) != 0) | |
3120 | return TRUE; | |
3121 | ||
e23eba97 | 3122 | BFD_ASSERT (rel->r_offset + 4 <= sec->size); |
45f76423 AW |
3123 | switch (ELFNN_R_TYPE (rel->r_info)) |
3124 | { | |
3125 | case R_RISCV_TPREL_LO12_I: | |
3126 | rel->r_info = ELFNN_R_INFO (ELFNN_R_SYM (rel->r_info), R_RISCV_TPREL_I); | |
3127 | return TRUE; | |
e23eba97 | 3128 | |
45f76423 AW |
3129 | case R_RISCV_TPREL_LO12_S: |
3130 | rel->r_info = ELFNN_R_INFO (ELFNN_R_SYM (rel->r_info), R_RISCV_TPREL_S); | |
3131 | return TRUE; | |
3132 | ||
3133 | case R_RISCV_TPREL_HI20: | |
3134 | case R_RISCV_TPREL_ADD: | |
3135 | /* We can delete the unnecessary instruction and reloc. */ | |
3136 | rel->r_info = ELFNN_R_INFO (0, R_RISCV_NONE); | |
3137 | *again = TRUE; | |
7f02625e | 3138 | return riscv_relax_delete_bytes (abfd, sec, rel->r_offset, 4, link_info); |
45f76423 AW |
3139 | |
3140 | default: | |
3141 | abort (); | |
3142 | } | |
e23eba97 NC |
3143 | } |
3144 | ||
3145 | /* Implement R_RISCV_ALIGN by deleting excess alignment NOPs. */ | |
3146 | ||
3147 | static bfd_boolean | |
3148 | _bfd_riscv_relax_align (bfd *abfd, asection *sec, | |
9eb7b0ac | 3149 | asection *sym_sec, |
7f02625e | 3150 | struct bfd_link_info *link_info, |
e23eba97 NC |
3151 | Elf_Internal_Rela *rel, |
3152 | bfd_vma symval, | |
45f76423 AW |
3153 | bfd_vma max_alignment ATTRIBUTE_UNUSED, |
3154 | bfd_vma reserve_size ATTRIBUTE_UNUSED, | |
9d06997a PD |
3155 | bfd_boolean *again ATTRIBUTE_UNUSED, |
3156 | riscv_pcgp_relocs *pcrel_relocs ATTRIBUTE_UNUSED) | |
e23eba97 NC |
3157 | { |
3158 | bfd_byte *contents = elf_section_data (sec)->this_hdr.contents; | |
3159 | bfd_vma alignment = 1, pos; | |
3160 | while (alignment <= rel->r_addend) | |
3161 | alignment *= 2; | |
3162 | ||
3163 | symval -= rel->r_addend; | |
3164 | bfd_vma aligned_addr = ((symval - 1) & ~(alignment - 1)) + alignment; | |
3165 | bfd_vma nop_bytes = aligned_addr - symval; | |
3166 | ||
3167 | /* Once we've handled an R_RISCV_ALIGN, we can't relax anything else. */ | |
3168 | sec->sec_flg0 = TRUE; | |
3169 | ||
3170 | /* Make sure there are enough NOPs to actually achieve the alignment. */ | |
3171 | if (rel->r_addend < nop_bytes) | |
9eb7b0ac | 3172 | { |
f2b740ac AM |
3173 | _bfd_error_handler |
3174 | (_("%pB(%pA+%#" PRIx64 "): %" PRId64 " bytes required for alignment " | |
3175 | "to %" PRId64 "-byte boundary, but only %" PRId64 " present"), | |
3176 | abfd, sym_sec, (uint64_t) rel->r_offset, | |
3177 | (int64_t) nop_bytes, (int64_t) alignment, (int64_t) rel->r_addend); | |
9eb7b0ac PD |
3178 | bfd_set_error (bfd_error_bad_value); |
3179 | return FALSE; | |
3180 | } | |
e23eba97 NC |
3181 | |
3182 | /* Delete the reloc. */ | |
3183 | rel->r_info = ELFNN_R_INFO (0, R_RISCV_NONE); | |
3184 | ||
3185 | /* If the number of NOPs is already correct, there's nothing to do. */ | |
3186 | if (nop_bytes == rel->r_addend) | |
3187 | return TRUE; | |
3188 | ||
3189 | /* Write as many RISC-V NOPs as we need. */ | |
3190 | for (pos = 0; pos < (nop_bytes & -4); pos += 4) | |
3191 | bfd_put_32 (abfd, RISCV_NOP, contents + rel->r_offset + pos); | |
3192 | ||
3193 | /* Write a final RVC NOP if need be. */ | |
3194 | if (nop_bytes % 4 != 0) | |
3195 | bfd_put_16 (abfd, RVC_NOP, contents + rel->r_offset + pos); | |
3196 | ||
3197 | /* Delete the excess bytes. */ | |
3198 | return riscv_relax_delete_bytes (abfd, sec, rel->r_offset + nop_bytes, | |
7f02625e | 3199 | rel->r_addend - nop_bytes, link_info); |
e23eba97 NC |
3200 | } |
3201 | ||
ff6f4d9b PD |
3202 | /* Relax PC-relative references to GP-relative references. */ |
3203 | ||
9d06997a PD |
3204 | static bfd_boolean |
3205 | _bfd_riscv_relax_pc (bfd *abfd, | |
3206 | asection *sec, | |
3207 | asection *sym_sec, | |
3208 | struct bfd_link_info *link_info, | |
3209 | Elf_Internal_Rela *rel, | |
3210 | bfd_vma symval, | |
3211 | bfd_vma max_alignment, | |
3212 | bfd_vma reserve_size, | |
3213 | bfd_boolean *again ATTRIBUTE_UNUSED, | |
3214 | riscv_pcgp_relocs *pcgp_relocs) | |
3215 | { | |
3216 | bfd_vma gp = riscv_global_pointer_value (link_info); | |
3217 | ||
3218 | BFD_ASSERT (rel->r_offset + 4 <= sec->size); | |
3219 | ||
3220 | /* Chain the _LO relocs to their cooresponding _HI reloc to compute the | |
3221 | * actual target address. */ | |
e65b1a78 MR |
3222 | riscv_pcgp_hi_reloc hi_reloc; |
3223 | memset (&hi_reloc, 0, sizeof (hi_reloc)); | |
9d06997a PD |
3224 | switch (ELFNN_R_TYPE (rel->r_info)) |
3225 | { | |
3226 | case R_RISCV_PCREL_LO12_I: | |
3227 | case R_RISCV_PCREL_LO12_S: | |
3228 | { | |
a05f27b6 JW |
3229 | /* If the %lo has an addend, it isn't for the label pointing at the |
3230 | hi part instruction, but rather for the symbol pointed at by the | |
3231 | hi part instruction. So we must subtract it here for the lookup. | |
3232 | It is still used below in the final symbol address. */ | |
3233 | bfd_vma hi_sec_off = symval - sec_addr (sym_sec) - rel->r_addend; | |
9d06997a | 3234 | riscv_pcgp_hi_reloc *hi = riscv_find_pcgp_hi_reloc (pcgp_relocs, |
a05f27b6 | 3235 | hi_sec_off); |
9d06997a PD |
3236 | if (hi == NULL) |
3237 | { | |
a05f27b6 | 3238 | riscv_record_pcgp_lo_reloc (pcgp_relocs, hi_sec_off); |
9d06997a PD |
3239 | return TRUE; |
3240 | } | |
3241 | ||
3242 | hi_reloc = *hi; | |
3243 | symval = hi_reloc.hi_addr; | |
3244 | sym_sec = hi_reloc.sym_sec; | |
3245 | if (!riscv_use_pcgp_hi_reloc(pcgp_relocs, hi->hi_sec_off)) | |
f2b740ac AM |
3246 | _bfd_error_handler |
3247 | (_("%pB(%pA+%#" PRIx64 "): Unable to clear RISCV_PCREL_HI20 reloc " | |
3248 | "for corresponding RISCV_PCREL_LO12 reloc"), | |
3249 | abfd, sec, (uint64_t) rel->r_offset); | |
9d06997a PD |
3250 | } |
3251 | break; | |
3252 | ||
3253 | case R_RISCV_PCREL_HI20: | |
3254 | /* Mergeable symbols and code might later move out of range. */ | |
3255 | if (sym_sec->flags & (SEC_MERGE | SEC_CODE)) | |
3256 | return TRUE; | |
3257 | ||
3258 | /* If the cooresponding lo relocation has already been seen then it's not | |
3259 | * safe to relax this relocation. */ | |
3260 | if (riscv_find_pcgp_lo_reloc (pcgp_relocs, rel->r_offset)) | |
07d6d2b8 | 3261 | return TRUE; |
9d06997a PD |
3262 | |
3263 | break; | |
3264 | ||
3265 | default: | |
3266 | abort (); | |
3267 | } | |
3268 | ||
3269 | if (gp) | |
3270 | { | |
3271 | /* If gp and the symbol are in the same output section, then | |
3272 | consider only that section's alignment. */ | |
3273 | struct bfd_link_hash_entry *h = | |
3274 | bfd_link_hash_lookup (link_info->hash, RISCV_GP_SYMBOL, FALSE, FALSE, TRUE); | |
3275 | if (h->u.def.section->output_section == sym_sec->output_section) | |
3276 | max_alignment = (bfd_vma) 1 << sym_sec->output_section->alignment_power; | |
3277 | } | |
3278 | ||
3279 | /* Is the reference in range of x0 or gp? | |
3280 | Valid gp range conservatively because of alignment issue. */ | |
3281 | if (VALID_ITYPE_IMM (symval) | |
3282 | || (symval >= gp | |
3283 | && VALID_ITYPE_IMM (symval - gp + max_alignment + reserve_size)) | |
3284 | || (symval < gp | |
3285 | && VALID_ITYPE_IMM (symval - gp - max_alignment - reserve_size))) | |
3286 | { | |
3287 | unsigned sym = hi_reloc.hi_sym; | |
3288 | switch (ELFNN_R_TYPE (rel->r_info)) | |
3289 | { | |
3290 | case R_RISCV_PCREL_LO12_I: | |
3291 | rel->r_info = ELFNN_R_INFO (sym, R_RISCV_GPREL_I); | |
3292 | rel->r_addend += hi_reloc.hi_addend; | |
3293 | return riscv_delete_pcgp_lo_reloc (pcgp_relocs, rel->r_offset, 4); | |
3294 | ||
3295 | case R_RISCV_PCREL_LO12_S: | |
3296 | rel->r_info = ELFNN_R_INFO (sym, R_RISCV_GPREL_S); | |
3297 | rel->r_addend += hi_reloc.hi_addend; | |
3298 | return riscv_delete_pcgp_lo_reloc (pcgp_relocs, rel->r_offset, 4); | |
3299 | ||
3300 | case R_RISCV_PCREL_HI20: | |
07d6d2b8 | 3301 | riscv_record_pcgp_hi_reloc (pcgp_relocs, |
9d06997a PD |
3302 | rel->r_offset, |
3303 | rel->r_addend, | |
3304 | symval, | |
3305 | ELFNN_R_SYM(rel->r_info), | |
3306 | sym_sec); | |
3307 | /* We can delete the unnecessary AUIPC and reloc. */ | |
3308 | rel->r_info = ELFNN_R_INFO (0, R_RISCV_DELETE); | |
3309 | rel->r_addend = 4; | |
3310 | return riscv_delete_pcgp_hi_reloc (pcgp_relocs, rel->r_offset); | |
3311 | ||
3312 | default: | |
3313 | abort (); | |
3314 | } | |
3315 | } | |
3316 | ||
3317 | return TRUE; | |
3318 | } | |
3319 | ||
3320 | /* Relax PC-relative references to GP-relative references. */ | |
3321 | ||
ff6f4d9b PD |
3322 | static bfd_boolean |
3323 | _bfd_riscv_relax_delete (bfd *abfd, | |
3324 | asection *sec, | |
3325 | asection *sym_sec ATTRIBUTE_UNUSED, | |
7f02625e | 3326 | struct bfd_link_info *link_info, |
ff6f4d9b PD |
3327 | Elf_Internal_Rela *rel, |
3328 | bfd_vma symval ATTRIBUTE_UNUSED, | |
3329 | bfd_vma max_alignment ATTRIBUTE_UNUSED, | |
3330 | bfd_vma reserve_size ATTRIBUTE_UNUSED, | |
9d06997a PD |
3331 | bfd_boolean *again ATTRIBUTE_UNUSED, |
3332 | riscv_pcgp_relocs *pcgp_relocs ATTRIBUTE_UNUSED) | |
ff6f4d9b | 3333 | { |
7f02625e JW |
3334 | if (!riscv_relax_delete_bytes(abfd, sec, rel->r_offset, rel->r_addend, |
3335 | link_info)) | |
ff6f4d9b PD |
3336 | return FALSE; |
3337 | rel->r_info = ELFNN_R_INFO(0, R_RISCV_NONE); | |
3338 | return TRUE; | |
3339 | } | |
3340 | ||
3341 | /* Relax a section. Pass 0 shortens code sequences unless disabled. Pass 1 | |
3342 | deletes the bytes that pass 0 made obselete. Pass 2, which cannot be | |
3343 | disabled, handles code alignment directives. */ | |
e23eba97 NC |
3344 | |
3345 | static bfd_boolean | |
3346 | _bfd_riscv_relax_section (bfd *abfd, asection *sec, | |
3347 | struct bfd_link_info *info, | |
3348 | bfd_boolean *again) | |
3349 | { | |
3350 | Elf_Internal_Shdr *symtab_hdr = &elf_symtab_hdr (abfd); | |
3351 | struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info); | |
3352 | struct bfd_elf_section_data *data = elf_section_data (sec); | |
3353 | Elf_Internal_Rela *relocs; | |
3354 | bfd_boolean ret = FALSE; | |
3355 | unsigned int i; | |
45f76423 | 3356 | bfd_vma max_alignment, reserve_size = 0; |
9d06997a | 3357 | riscv_pcgp_relocs pcgp_relocs; |
e23eba97 NC |
3358 | |
3359 | *again = FALSE; | |
3360 | ||
3361 | if (bfd_link_relocatable (info) | |
3362 | || sec->sec_flg0 | |
3363 | || (sec->flags & SEC_RELOC) == 0 | |
3364 | || sec->reloc_count == 0 | |
3365 | || (info->disable_target_specific_optimizations | |
3366 | && info->relax_pass == 0)) | |
3367 | return TRUE; | |
3368 | ||
9d06997a PD |
3369 | riscv_init_pcgp_relocs (&pcgp_relocs); |
3370 | ||
e23eba97 NC |
3371 | /* Read this BFD's relocs if we haven't done so already. */ |
3372 | if (data->relocs) | |
3373 | relocs = data->relocs; | |
3374 | else if (!(relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, | |
3375 | info->keep_memory))) | |
3376 | goto fail; | |
3377 | ||
fc3c5343 L |
3378 | if (htab) |
3379 | { | |
3380 | max_alignment = htab->max_alignment; | |
3381 | if (max_alignment == (bfd_vma) -1) | |
3382 | { | |
3383 | max_alignment = _bfd_riscv_get_max_alignment (sec); | |
3384 | htab->max_alignment = max_alignment; | |
3385 | } | |
3386 | } | |
3387 | else | |
3388 | max_alignment = _bfd_riscv_get_max_alignment (sec); | |
e23eba97 NC |
3389 | |
3390 | /* Examine and consider relaxing each reloc. */ | |
3391 | for (i = 0; i < sec->reloc_count; i++) | |
3392 | { | |
3393 | asection *sym_sec; | |
3394 | Elf_Internal_Rela *rel = relocs + i; | |
45f76423 | 3395 | relax_func_t relax_func; |
e23eba97 NC |
3396 | int type = ELFNN_R_TYPE (rel->r_info); |
3397 | bfd_vma symval; | |
3398 | ||
ff6f4d9b | 3399 | relax_func = NULL; |
e23eba97 NC |
3400 | if (info->relax_pass == 0) |
3401 | { | |
3402 | if (type == R_RISCV_CALL || type == R_RISCV_CALL_PLT) | |
3403 | relax_func = _bfd_riscv_relax_call; | |
3404 | else if (type == R_RISCV_HI20 | |
3405 | || type == R_RISCV_LO12_I | |
3406 | || type == R_RISCV_LO12_S) | |
3407 | relax_func = _bfd_riscv_relax_lui; | |
9d06997a PD |
3408 | else if (!bfd_link_pic(info) |
3409 | && (type == R_RISCV_PCREL_HI20 | |
3410 | || type == R_RISCV_PCREL_LO12_I | |
3411 | || type == R_RISCV_PCREL_LO12_S)) | |
3412 | relax_func = _bfd_riscv_relax_pc; | |
45f76423 AW |
3413 | else if (type == R_RISCV_TPREL_HI20 |
3414 | || type == R_RISCV_TPREL_ADD | |
3415 | || type == R_RISCV_TPREL_LO12_I | |
3416 | || type == R_RISCV_TPREL_LO12_S) | |
e23eba97 | 3417 | relax_func = _bfd_riscv_relax_tls_le; |
45f76423 AW |
3418 | else |
3419 | continue; | |
3420 | ||
3421 | /* Only relax this reloc if it is paired with R_RISCV_RELAX. */ | |
3422 | if (i == sec->reloc_count - 1 | |
3423 | || ELFNN_R_TYPE ((rel + 1)->r_info) != R_RISCV_RELAX | |
3424 | || rel->r_offset != (rel + 1)->r_offset) | |
3425 | continue; | |
3426 | ||
3427 | /* Skip over the R_RISCV_RELAX. */ | |
3428 | i++; | |
e23eba97 | 3429 | } |
ff6f4d9b | 3430 | else if (info->relax_pass == 1 && type == R_RISCV_DELETE) |
07d6d2b8 | 3431 | relax_func = _bfd_riscv_relax_delete; |
ff6f4d9b | 3432 | else if (info->relax_pass == 2 && type == R_RISCV_ALIGN) |
e23eba97 | 3433 | relax_func = _bfd_riscv_relax_align; |
45f76423 | 3434 | else |
e23eba97 NC |
3435 | continue; |
3436 | ||
3437 | data->relocs = relocs; | |
3438 | ||
3439 | /* Read this BFD's contents if we haven't done so already. */ | |
3440 | if (!data->this_hdr.contents | |
3441 | && !bfd_malloc_and_get_section (abfd, sec, &data->this_hdr.contents)) | |
3442 | goto fail; | |
3443 | ||
3444 | /* Read this BFD's symbols if we haven't done so already. */ | |
3445 | if (symtab_hdr->sh_info != 0 | |
3446 | && !symtab_hdr->contents | |
3447 | && !(symtab_hdr->contents = | |
3448 | (unsigned char *) bfd_elf_get_elf_syms (abfd, symtab_hdr, | |
3449 | symtab_hdr->sh_info, | |
3450 | 0, NULL, NULL, NULL))) | |
3451 | goto fail; | |
3452 | ||
3453 | /* Get the value of the symbol referred to by the reloc. */ | |
3454 | if (ELFNN_R_SYM (rel->r_info) < symtab_hdr->sh_info) | |
3455 | { | |
3456 | /* A local symbol. */ | |
3457 | Elf_Internal_Sym *isym = ((Elf_Internal_Sym *) symtab_hdr->contents | |
3458 | + ELFNN_R_SYM (rel->r_info)); | |
45f76423 AW |
3459 | reserve_size = (isym->st_size - rel->r_addend) > isym->st_size |
3460 | ? 0 : isym->st_size - rel->r_addend; | |
e23eba97 NC |
3461 | |
3462 | if (isym->st_shndx == SHN_UNDEF) | |
3463 | sym_sec = sec, symval = sec_addr (sec) + rel->r_offset; | |
3464 | else | |
3465 | { | |
3466 | BFD_ASSERT (isym->st_shndx < elf_numsections (abfd)); | |
3467 | sym_sec = elf_elfsections (abfd)[isym->st_shndx]->bfd_section; | |
09ca4b9d JW |
3468 | #if 0 |
3469 | /* The purpose of this code is unknown. It breaks linker scripts | |
3470 | for embedded development that place sections at address zero. | |
3471 | This code is believed to be unnecessary. Disabling it but not | |
3472 | yet removing it, in case something breaks. */ | |
e23eba97 NC |
3473 | if (sec_addr (sym_sec) == 0) |
3474 | continue; | |
09ca4b9d | 3475 | #endif |
e23eba97 NC |
3476 | symval = sec_addr (sym_sec) + isym->st_value; |
3477 | } | |
3478 | } | |
3479 | else | |
3480 | { | |
3481 | unsigned long indx; | |
3482 | struct elf_link_hash_entry *h; | |
3483 | ||
3484 | indx = ELFNN_R_SYM (rel->r_info) - symtab_hdr->sh_info; | |
3485 | h = elf_sym_hashes (abfd)[indx]; | |
3486 | ||
3487 | while (h->root.type == bfd_link_hash_indirect | |
3488 | || h->root.type == bfd_link_hash_warning) | |
3489 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
3490 | ||
3491 | if (h->plt.offset != MINUS_ONE) | |
3492 | symval = sec_addr (htab->elf.splt) + h->plt.offset; | |
3493 | else if (h->root.u.def.section->output_section == NULL | |
3494 | || (h->root.type != bfd_link_hash_defined | |
3495 | && h->root.type != bfd_link_hash_defweak)) | |
3496 | continue; | |
3497 | else | |
3498 | symval = sec_addr (h->root.u.def.section) + h->root.u.def.value; | |
3499 | ||
45f76423 AW |
3500 | if (h->type != STT_FUNC) |
3501 | reserve_size = | |
3502 | (h->size - rel->r_addend) > h->size ? 0 : h->size - rel->r_addend; | |
e23eba97 NC |
3503 | sym_sec = h->root.u.def.section; |
3504 | } | |
3505 | ||
3506 | symval += rel->r_addend; | |
3507 | ||
3508 | if (!relax_func (abfd, sec, sym_sec, info, rel, symval, | |
9d06997a PD |
3509 | max_alignment, reserve_size, again, |
3510 | &pcgp_relocs)) | |
e23eba97 NC |
3511 | goto fail; |
3512 | } | |
3513 | ||
3514 | ret = TRUE; | |
3515 | ||
3516 | fail: | |
3517 | if (relocs != data->relocs) | |
3518 | free (relocs); | |
9d06997a | 3519 | riscv_free_pcgp_relocs(&pcgp_relocs, abfd, sec); |
e23eba97 NC |
3520 | |
3521 | return ret; | |
3522 | } | |
3523 | ||
3524 | #if ARCH_SIZE == 32 | |
3525 | # define PRSTATUS_SIZE 0 /* FIXME */ | |
3526 | # define PRSTATUS_OFFSET_PR_CURSIG 12 | |
3527 | # define PRSTATUS_OFFSET_PR_PID 24 | |
3528 | # define PRSTATUS_OFFSET_PR_REG 72 | |
3529 | # define ELF_GREGSET_T_SIZE 128 | |
3530 | # define PRPSINFO_SIZE 128 | |
3531 | # define PRPSINFO_OFFSET_PR_PID 16 | |
3532 | # define PRPSINFO_OFFSET_PR_FNAME 32 | |
3533 | # define PRPSINFO_OFFSET_PR_PSARGS 48 | |
3534 | #else | |
3535 | # define PRSTATUS_SIZE 376 | |
3536 | # define PRSTATUS_OFFSET_PR_CURSIG 12 | |
3537 | # define PRSTATUS_OFFSET_PR_PID 32 | |
3538 | # define PRSTATUS_OFFSET_PR_REG 112 | |
3539 | # define ELF_GREGSET_T_SIZE 256 | |
3540 | # define PRPSINFO_SIZE 136 | |
3541 | # define PRPSINFO_OFFSET_PR_PID 24 | |
3542 | # define PRPSINFO_OFFSET_PR_FNAME 40 | |
3543 | # define PRPSINFO_OFFSET_PR_PSARGS 56 | |
3544 | #endif | |
3545 | ||
3546 | /* Support for core dump NOTE sections. */ | |
3547 | ||
3548 | static bfd_boolean | |
3549 | riscv_elf_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) | |
3550 | { | |
3551 | switch (note->descsz) | |
3552 | { | |
3553 | default: | |
3554 | return FALSE; | |
3555 | ||
3556 | case PRSTATUS_SIZE: /* sizeof(struct elf_prstatus) on Linux/RISC-V. */ | |
3557 | /* pr_cursig */ | |
3558 | elf_tdata (abfd)->core->signal | |
3559 | = bfd_get_16 (abfd, note->descdata + PRSTATUS_OFFSET_PR_CURSIG); | |
3560 | ||
3561 | /* pr_pid */ | |
3562 | elf_tdata (abfd)->core->lwpid | |
3563 | = bfd_get_32 (abfd, note->descdata + PRSTATUS_OFFSET_PR_PID); | |
3564 | break; | |
3565 | } | |
3566 | ||
3567 | /* Make a ".reg/999" section. */ | |
3568 | return _bfd_elfcore_make_pseudosection (abfd, ".reg", ELF_GREGSET_T_SIZE, | |
3569 | note->descpos + PRSTATUS_OFFSET_PR_REG); | |
3570 | } | |
3571 | ||
3572 | static bfd_boolean | |
3573 | riscv_elf_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) | |
3574 | { | |
3575 | switch (note->descsz) | |
3576 | { | |
3577 | default: | |
3578 | return FALSE; | |
3579 | ||
3580 | case PRPSINFO_SIZE: /* sizeof(struct elf_prpsinfo) on Linux/RISC-V. */ | |
3581 | /* pr_pid */ | |
3582 | elf_tdata (abfd)->core->pid | |
3583 | = bfd_get_32 (abfd, note->descdata + PRPSINFO_OFFSET_PR_PID); | |
3584 | ||
3585 | /* pr_fname */ | |
3586 | elf_tdata (abfd)->core->program = _bfd_elfcore_strndup | |
3587 | (abfd, note->descdata + PRPSINFO_OFFSET_PR_FNAME, 16); | |
3588 | ||
3589 | /* pr_psargs */ | |
3590 | elf_tdata (abfd)->core->command = _bfd_elfcore_strndup | |
3591 | (abfd, note->descdata + PRPSINFO_OFFSET_PR_PSARGS, 80); | |
3592 | break; | |
3593 | } | |
3594 | ||
3595 | /* Note that for some reason, a spurious space is tacked | |
3596 | onto the end of the args in some (at least one anyway) | |
3597 | implementations, so strip it off if it exists. */ | |
3598 | ||
3599 | { | |
3600 | char *command = elf_tdata (abfd)->core->command; | |
3601 | int n = strlen (command); | |
3602 | ||
3603 | if (0 < n && command[n - 1] == ' ') | |
3604 | command[n - 1] = '\0'; | |
3605 | } | |
3606 | ||
3607 | return TRUE; | |
3608 | } | |
3609 | ||
640d6bfd KLC |
3610 | /* Set the right mach type. */ |
3611 | static bfd_boolean | |
3612 | riscv_elf_object_p (bfd *abfd) | |
3613 | { | |
3614 | /* There are only two mach types in RISCV currently. */ | |
3615 | if (strcmp (abfd->xvec->name, "elf32-littleriscv") == 0) | |
3616 | bfd_default_set_arch_mach (abfd, bfd_arch_riscv, bfd_mach_riscv32); | |
3617 | else | |
3618 | bfd_default_set_arch_mach (abfd, bfd_arch_riscv, bfd_mach_riscv64); | |
3619 | ||
3620 | return TRUE; | |
3621 | } | |
3622 | ||
e23eba97 NC |
3623 | |
3624 | #define TARGET_LITTLE_SYM riscv_elfNN_vec | |
3625 | #define TARGET_LITTLE_NAME "elfNN-littleriscv" | |
3626 | ||
3627 | #define elf_backend_reloc_type_class riscv_reloc_type_class | |
3628 | ||
3629 | #define bfd_elfNN_bfd_reloc_name_lookup riscv_reloc_name_lookup | |
3630 | #define bfd_elfNN_bfd_link_hash_table_create riscv_elf_link_hash_table_create | |
3631 | #define bfd_elfNN_bfd_reloc_type_lookup riscv_reloc_type_lookup | |
3632 | #define bfd_elfNN_bfd_merge_private_bfd_data \ | |
3633 | _bfd_riscv_elf_merge_private_bfd_data | |
3634 | ||
3635 | #define elf_backend_copy_indirect_symbol riscv_elf_copy_indirect_symbol | |
3636 | #define elf_backend_create_dynamic_sections riscv_elf_create_dynamic_sections | |
3637 | #define elf_backend_check_relocs riscv_elf_check_relocs | |
3638 | #define elf_backend_adjust_dynamic_symbol riscv_elf_adjust_dynamic_symbol | |
3639 | #define elf_backend_size_dynamic_sections riscv_elf_size_dynamic_sections | |
3640 | #define elf_backend_relocate_section riscv_elf_relocate_section | |
3641 | #define elf_backend_finish_dynamic_symbol riscv_elf_finish_dynamic_symbol | |
3642 | #define elf_backend_finish_dynamic_sections riscv_elf_finish_dynamic_sections | |
3643 | #define elf_backend_gc_mark_hook riscv_elf_gc_mark_hook | |
e23eba97 | 3644 | #define elf_backend_plt_sym_val riscv_elf_plt_sym_val |
07d6d2b8 AM |
3645 | #define elf_backend_grok_prstatus riscv_elf_grok_prstatus |
3646 | #define elf_backend_grok_psinfo riscv_elf_grok_psinfo | |
3647 | #define elf_backend_object_p riscv_elf_object_p | |
e23eba97 NC |
3648 | #define elf_info_to_howto_rel NULL |
3649 | #define elf_info_to_howto riscv_info_to_howto_rela | |
3650 | #define bfd_elfNN_bfd_relax_section _bfd_riscv_relax_section | |
3651 | ||
3652 | #define elf_backend_init_index_section _bfd_elf_init_1_index_section | |
3653 | ||
3654 | #define elf_backend_can_gc_sections 1 | |
3655 | #define elf_backend_can_refcount 1 | |
3656 | #define elf_backend_want_got_plt 1 | |
3657 | #define elf_backend_plt_readonly 1 | |
3658 | #define elf_backend_plt_alignment 4 | |
3659 | #define elf_backend_want_plt_sym 1 | |
3660 | #define elf_backend_got_header_size (ARCH_SIZE / 8) | |
5474d94f | 3661 | #define elf_backend_want_dynrelro 1 |
e23eba97 NC |
3662 | #define elf_backend_rela_normal 1 |
3663 | #define elf_backend_default_execstack 0 | |
3664 | ||
3665 | #include "elfNN-target.h" |