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e23eba97 | 1 | /* RISC-V-specific support for NN-bit ELF. |
d87bef3a | 2 | Copyright (C) 2011-2023 Free Software Foundation, Inc. |
e23eba97 NC |
3 | |
4 | Contributed by Andrew Waterman (andrew@sifive.com). | |
5 | Based on TILE-Gx and MIPS targets. | |
6 | ||
7 | This file is part of BFD, the Binary File Descriptor library. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 3 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program; see the file COPYING3. If not, | |
21 | see <http://www.gnu.org/licenses/>. */ | |
22 | ||
23 | /* This file handles RISC-V ELF targets. */ | |
24 | ||
25 | #include "sysdep.h" | |
26 | #include "bfd.h" | |
27 | #include "libbfd.h" | |
28 | #include "bfdlink.h" | |
29 | #include "genlink.h" | |
30 | #include "elf-bfd.h" | |
31 | #include "elfxx-riscv.h" | |
32 | #include "elf/riscv.h" | |
33 | #include "opcode/riscv.h" | |
02dd9d25 | 34 | #include "objalloc.h" |
e23eba97 | 35 | |
fbc09e7a | 36 | #include <limits.h> |
fbc09e7a MC |
37 | #ifndef CHAR_BIT |
38 | #define CHAR_BIT 8 | |
39 | #endif | |
40 | ||
23068b02 NC |
41 | /* True if dynamic relocation is needed. If we are creating a shared library, |
42 | and this is a reloc against a global symbol, or a non PC relative reloc | |
43 | against a local symbol, then we need to copy the reloc into the shared | |
44 | library. However, if we are linking with -Bsymbolic, we do not need to | |
45 | copy a reloc against a global symbol which is defined in an object we are | |
46 | including in the link (i.e., DEF_REGULAR is set). | |
47 | ||
48 | At this point we have not seen all the input files, so it is possible that | |
49 | DEF_REGULAR is not set now but will be set later (it is never cleared). | |
50 | In case of a weak definition, DEF_REGULAR may be cleared later by a strong | |
51 | definition in a shared library. We account for that possibility below by | |
52 | storing information in the relocs_copied field of the hash table entry. | |
53 | A similar situation occurs when creating shared libraries and symbol | |
54 | visibility changes render the symbol local. | |
55 | ||
56 | If on the other hand, we are creating an executable, we may need to keep | |
57 | relocations for symbols satisfied by a dynamic library if we manage to | |
58 | avoid copy relocs for the symbol. | |
59 | ||
60 | Generate dynamic pointer relocation against STT_GNU_IFUNC symbol in the | |
61 | non-code section (R_RISCV_32/R_RISCV_64). */ | |
62 | #define RISCV_NEED_DYNAMIC_RELOC(PCREL, INFO, H, SEC) \ | |
63 | ((bfd_link_pic (INFO) \ | |
64 | && ((SEC)->flags & SEC_ALLOC) != 0 \ | |
65 | && (!(PCREL) \ | |
66 | || ((H) != NULL \ | |
67 | && (!(INFO)->symbolic \ | |
68 | || (H)->root.type == bfd_link_hash_defweak \ | |
69 | || !(H)->def_regular)))) \ | |
70 | || (!bfd_link_pic (INFO) \ | |
71 | && ((SEC)->flags & SEC_ALLOC) != 0 \ | |
72 | && (H) != NULL \ | |
73 | && ((H)->root.type == bfd_link_hash_defweak \ | |
74 | || !(H)->def_regular)) \ | |
75 | || (!bfd_link_pic (INFO) \ | |
76 | && (H) != NULL \ | |
77 | && (H)->type == STT_GNU_IFUNC \ | |
78 | && ((SEC)->flags & SEC_CODE) == 0)) | |
79 | ||
80 | /* True if dynamic relocation should be generated. */ | |
81 | #define RISCV_GENERATE_DYNAMIC_RELOC(PCREL, INFO, H, RESOLVED_TO_ZERO) \ | |
82 | ((bfd_link_pic (INFO) \ | |
83 | && ((H) == NULL \ | |
84 | || (ELF_ST_VISIBILITY ((H)->other) == STV_DEFAULT && !(RESOLVED_TO_ZERO)) \ | |
85 | || (H)->root.type != bfd_link_hash_undefweak) \ | |
86 | && (!(PCREL) \ | |
87 | || !SYMBOL_CALLS_LOCAL ((INFO), (H)))) \ | |
88 | || (!bfd_link_pic (INFO) \ | |
89 | && (H) != NULL \ | |
90 | && (H)->dynindx != -1 \ | |
91 | && !(H)->non_got_ref \ | |
92 | && (((H)->def_dynamic && !(H)->def_regular) \ | |
93 | || (H)->root.type == bfd_link_hash_undefweak \ | |
94 | || (H)->root.type == bfd_link_hash_undefined))) | |
95 | ||
96 | /* True if this input relocation should be copied to output. H->dynindx | |
97 | may be -1 if this symbol was marked to become local. */ | |
98 | #define RISCV_COPY_INPUT_RELOC(INFO, H) \ | |
99 | ((H) != NULL \ | |
100 | && (H)->dynindx != -1 \ | |
101 | && (!bfd_link_pic (INFO) \ | |
102 | || !SYMBOLIC_BIND ((INFO), (H)) \ | |
103 | || !(H)->def_regular)) | |
104 | ||
105 | /* True if this is actually a static link, or it is a -Bsymbolic link | |
106 | and the symbol is defined locally, or the symbol was forced to be | |
107 | local because of a version file. */ | |
108 | #define RISCV_RESOLVED_LOCALLY(INFO, H) \ | |
109 | (!WILL_CALL_FINISH_DYNAMIC_SYMBOL (elf_hash_table (INFO)->dynamic_sections_created, \ | |
110 | bfd_link_pic (INFO), (H)) \ | |
111 | || (bfd_link_pic (INFO) \ | |
112 | && SYMBOL_REFERENCES_LOCAL ((INFO), (H)))) | |
113 | ||
20ef84ed NC |
114 | /* Set NEED_RELOC to true if TLS GD/IE needs dynamic relocations, and INDX will |
115 | be the dynamic index. PR22263, use the same check in allocate_dynrelocs and | |
116 | riscv_elf_relocate_section for TLS GD/IE. */ | |
117 | #define RISCV_TLS_GD_IE_NEED_DYN_RELOC(INFO, DYN, H, INDX, NEED_RELOC) \ | |
118 | do \ | |
119 | { \ | |
120 | if ((H) != NULL \ | |
121 | && (H)->dynindx != -1 \ | |
122 | && WILL_CALL_FINISH_DYNAMIC_SYMBOL ((DYN), bfd_link_pic (INFO), (H)) \ | |
123 | && (bfd_link_dll (INFO) || !SYMBOL_REFERENCES_LOCAL ((INFO), (H)))) \ | |
124 | (INDX) = (H)->dynindx; \ | |
125 | if ((bfd_link_dll (INFO) || (INDX) != 0) \ | |
126 | && ((H) == NULL \ | |
127 | || ELF_ST_VISIBILITY ((H)->other) == STV_DEFAULT \ | |
128 | || (H)->root.type != bfd_link_hash_undefweak)) \ | |
129 | (NEED_RELOC) = true; \ | |
130 | } \ | |
131 | while (0) | |
132 | ||
ff6f4d9b PD |
133 | /* Internal relocations used exclusively by the relaxation pass. */ |
134 | #define R_RISCV_DELETE (R_RISCV_max + 1) | |
135 | ||
e23eba97 NC |
136 | #define ARCH_SIZE NN |
137 | ||
138 | #define MINUS_ONE ((bfd_vma)0 - 1) | |
139 | ||
140 | #define RISCV_ELF_LOG_WORD_BYTES (ARCH_SIZE == 32 ? 2 : 3) | |
141 | ||
142 | #define RISCV_ELF_WORD_BYTES (1 << RISCV_ELF_LOG_WORD_BYTES) | |
143 | ||
144 | /* The name of the dynamic interpreter. This is put in the .interp | |
145 | section. */ | |
146 | ||
147 | #define ELF64_DYNAMIC_INTERPRETER "/lib/ld.so.1" | |
148 | #define ELF32_DYNAMIC_INTERPRETER "/lib32/ld.so.1" | |
149 | ||
150 | #define ELF_ARCH bfd_arch_riscv | |
151 | #define ELF_TARGET_ID RISCV_ELF_DATA | |
152 | #define ELF_MACHINE_CODE EM_RISCV | |
153 | #define ELF_MAXPAGESIZE 0x1000 | |
154 | #define ELF_COMMONPAGESIZE 0x1000 | |
155 | ||
fbc95f1e KC |
156 | #define RISCV_ATTRIBUTES_SECTION_NAME ".riscv.attributes" |
157 | ||
e23eba97 NC |
158 | /* RISC-V ELF linker hash entry. */ |
159 | ||
160 | struct riscv_elf_link_hash_entry | |
161 | { | |
162 | struct elf_link_hash_entry elf; | |
163 | ||
1942a048 NC |
164 | #define GOT_UNKNOWN 0 |
165 | #define GOT_NORMAL 1 | |
166 | #define GOT_TLS_GD 2 | |
167 | #define GOT_TLS_IE 4 | |
168 | #define GOT_TLS_LE 8 | |
e23eba97 NC |
169 | char tls_type; |
170 | }; | |
171 | ||
172 | #define riscv_elf_hash_entry(ent) \ | |
1942a048 | 173 | ((struct riscv_elf_link_hash_entry *) (ent)) |
e23eba97 NC |
174 | |
175 | struct _bfd_riscv_elf_obj_tdata | |
176 | { | |
177 | struct elf_obj_tdata root; | |
178 | ||
179 | /* tls_type for each local got entry. */ | |
180 | char *local_got_tls_type; | |
181 | }; | |
182 | ||
183 | #define _bfd_riscv_elf_tdata(abfd) \ | |
184 | ((struct _bfd_riscv_elf_obj_tdata *) (abfd)->tdata.any) | |
185 | ||
186 | #define _bfd_riscv_elf_local_got_tls_type(abfd) \ | |
187 | (_bfd_riscv_elf_tdata (abfd)->local_got_tls_type) | |
188 | ||
189 | #define _bfd_riscv_elf_tls_type(abfd, h, symndx) \ | |
190 | (*((h) != NULL ? &riscv_elf_hash_entry (h)->tls_type \ | |
191 | : &_bfd_riscv_elf_local_got_tls_type (abfd) [symndx])) | |
192 | ||
193 | #define is_riscv_elf(bfd) \ | |
194 | (bfd_get_flavour (bfd) == bfd_target_elf_flavour \ | |
195 | && elf_tdata (bfd) != NULL \ | |
196 | && elf_object_id (bfd) == RISCV_ELF_DATA) | |
197 | ||
0a1b45a2 | 198 | static bool |
fc46e8bd NC |
199 | elfNN_riscv_mkobject (bfd *abfd) |
200 | { | |
201 | return bfd_elf_allocate_object (abfd, | |
202 | sizeof (struct _bfd_riscv_elf_obj_tdata), | |
203 | RISCV_ELF_DATA); | |
204 | } | |
205 | ||
e23eba97 NC |
206 | #include "elf/common.h" |
207 | #include "elf/internal.h" | |
208 | ||
209 | struct riscv_elf_link_hash_table | |
210 | { | |
211 | struct elf_link_hash_table elf; | |
212 | ||
50980ba3 FS |
213 | /* Various options and other info passed from the linker. */ |
214 | struct riscv_elf_params *params; | |
215 | ||
e23eba97 | 216 | /* Short-cuts to get to dynamic linker sections. */ |
e23eba97 NC |
217 | asection *sdyntdata; |
218 | ||
fc3c5343 L |
219 | /* The max alignment of output sections. */ |
220 | bfd_vma max_alignment; | |
02dd9d25 | 221 | |
0699f2d7 LX |
222 | /* The max alignment of output sections in [gp-2K, gp+2K) range. */ |
223 | bfd_vma max_alignment_for_gp; | |
224 | ||
02dd9d25 NC |
225 | /* Used by local STT_GNU_IFUNC symbols. */ |
226 | htab_t loc_hash_table; | |
227 | void * loc_hash_memory; | |
51a8a7c2 NC |
228 | |
229 | /* The index of the last unused .rel.iplt slot. */ | |
230 | bfd_vma last_iplt_index; | |
ebdcad3f | 231 | |
ef9d2565 NC |
232 | /* The data segment phase, don't relax the section |
233 | when it is exp_seg_relro_adjust. */ | |
234 | int *data_segment_phase; | |
8155b853 NC |
235 | |
236 | /* Relocations for variant CC symbols may be present. */ | |
237 | int variant_cc; | |
e23eba97 NC |
238 | }; |
239 | ||
fbc09e7a | 240 | /* Instruction access functions. */ |
fbc09e7a MC |
241 | #define riscv_get_insn(bits, ptr) \ |
242 | ((bits) == 16 ? bfd_getl16 (ptr) \ | |
243 | : (bits) == 32 ? bfd_getl32 (ptr) \ | |
244 | : (bits) == 64 ? bfd_getl64 (ptr) \ | |
245 | : (abort (), (bfd_vma) - 1)) | |
246 | #define riscv_put_insn(bits, val, ptr) \ | |
247 | ((bits) == 16 ? bfd_putl16 (val, ptr) \ | |
248 | : (bits) == 32 ? bfd_putl32 (val, ptr) \ | |
249 | : (bits) == 64 ? bfd_putl64 (val, ptr) \ | |
250 | : (abort (), (void) 0)) | |
e23eba97 NC |
251 | |
252 | /* Get the RISC-V ELF linker hash table from a link_info structure. */ | |
253 | #define riscv_elf_hash_table(p) \ | |
0f55320b AM |
254 | ((is_elf_hash_table ((p)->hash) \ |
255 | && elf_hash_table_id (elf_hash_table (p)) == RISCV_ELF_DATA) \ | |
256 | ? (struct riscv_elf_link_hash_table *) (p)->hash : NULL) | |
e23eba97 | 257 | |
50980ba3 FS |
258 | void |
259 | riscv_elfNN_set_options (struct bfd_link_info *link_info, | |
260 | struct riscv_elf_params *params) | |
261 | { | |
262 | riscv_elf_hash_table (link_info)->params = params; | |
263 | } | |
264 | ||
0a1b45a2 | 265 | static bool |
0aa13fee | 266 | riscv_info_to_howto_rela (bfd *abfd, |
e23eba97 NC |
267 | arelent *cache_ptr, |
268 | Elf_Internal_Rela *dst) | |
269 | { | |
0aa13fee | 270 | cache_ptr->howto = riscv_elf_rtype_to_howto (abfd, ELFNN_R_TYPE (dst->r_info)); |
f3185997 | 271 | return cache_ptr->howto != NULL; |
e23eba97 NC |
272 | } |
273 | ||
274 | static void | |
275 | riscv_elf_append_rela (bfd *abfd, asection *s, Elf_Internal_Rela *rel) | |
276 | { | |
277 | const struct elf_backend_data *bed; | |
278 | bfd_byte *loc; | |
279 | ||
280 | bed = get_elf_backend_data (abfd); | |
281 | loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rela); | |
282 | bed->s->swap_reloca_out (abfd, rel, loc); | |
283 | } | |
284 | ||
fbc09e7a MC |
285 | /* Return true if a relocation is modifying an instruction. */ |
286 | ||
0a1b45a2 | 287 | static bool |
fbc09e7a MC |
288 | riscv_is_insn_reloc (const reloc_howto_type *howto) |
289 | { | |
290 | /* Heuristic: A multibyte destination with a nontrivial mask | |
291 | is an instruction */ | |
292 | return (howto->bitsize > 8 | |
293 | && howto->dst_mask != 0 | |
294 | && ~(howto->dst_mask | (howto->bitsize < sizeof(bfd_vma) * CHAR_BIT | |
295 | ? (MINUS_ONE << howto->bitsize) : (bfd_vma)0)) != 0); | |
296 | } | |
297 | ||
e23eba97 | 298 | /* PLT/GOT stuff. */ |
e23eba97 NC |
299 | #define PLT_HEADER_INSNS 8 |
300 | #define PLT_ENTRY_INSNS 4 | |
301 | #define PLT_HEADER_SIZE (PLT_HEADER_INSNS * 4) | |
302 | #define PLT_ENTRY_SIZE (PLT_ENTRY_INSNS * 4) | |
e23eba97 | 303 | #define GOT_ENTRY_SIZE RISCV_ELF_WORD_BYTES |
02dd9d25 NC |
304 | /* Reserve two entries of GOTPLT for ld.so, one is used for PLT resolver, |
305 | the other is used for link map. Other targets also reserve one more | |
306 | entry used for runtime profile? */ | |
e23eba97 NC |
307 | #define GOTPLT_HEADER_SIZE (2 * GOT_ENTRY_SIZE) |
308 | ||
309 | #define sec_addr(sec) ((sec)->output_section->vma + (sec)->output_offset) | |
310 | ||
e23eba97 NC |
311 | #if ARCH_SIZE == 32 |
312 | # define MATCH_LREG MATCH_LW | |
313 | #else | |
314 | # define MATCH_LREG MATCH_LD | |
315 | #endif | |
316 | ||
317 | /* Generate a PLT header. */ | |
318 | ||
0a1b45a2 | 319 | static bool |
5ef23793 JW |
320 | riscv_make_plt_header (bfd *output_bfd, bfd_vma gotplt_addr, bfd_vma addr, |
321 | uint32_t *entry) | |
e23eba97 NC |
322 | { |
323 | bfd_vma gotplt_offset_high = RISCV_PCREL_HIGH_PART (gotplt_addr, addr); | |
324 | bfd_vma gotplt_offset_low = RISCV_PCREL_LOW_PART (gotplt_addr, addr); | |
325 | ||
5ef23793 JW |
326 | /* RVE has no t3 register, so this won't work, and is not supported. */ |
327 | if (elf_elfheader (output_bfd)->e_flags & EF_RISCV_RVE) | |
328 | { | |
329 | _bfd_error_handler (_("%pB: warning: RVE PLT generation not supported"), | |
330 | output_bfd); | |
0a1b45a2 | 331 | return false; |
5ef23793 JW |
332 | } |
333 | ||
e23eba97 | 334 | /* auipc t2, %hi(.got.plt) |
07d6d2b8 | 335 | sub t1, t1, t3 # shifted .got.plt offset + hdr size + 12 |
e23eba97 NC |
336 | l[w|d] t3, %lo(.got.plt)(t2) # _dl_runtime_resolve |
337 | addi t1, t1, -(hdr size + 12) # shifted .got.plt offset | |
338 | addi t0, t2, %lo(.got.plt) # &.got.plt | |
339 | srli t1, t1, log2(16/PTRSIZE) # .got.plt offset | |
07d6d2b8 | 340 | l[w|d] t0, PTRSIZE(t0) # link map |
dcd709e0 | 341 | jr t3 */ |
e23eba97 NC |
342 | |
343 | entry[0] = RISCV_UTYPE (AUIPC, X_T2, gotplt_offset_high); | |
344 | entry[1] = RISCV_RTYPE (SUB, X_T1, X_T1, X_T3); | |
345 | entry[2] = RISCV_ITYPE (LREG, X_T3, X_T2, gotplt_offset_low); | |
1174d920 | 346 | entry[3] = RISCV_ITYPE (ADDI, X_T1, X_T1, (uint32_t) -(PLT_HEADER_SIZE + 12)); |
e23eba97 NC |
347 | entry[4] = RISCV_ITYPE (ADDI, X_T0, X_T2, gotplt_offset_low); |
348 | entry[5] = RISCV_ITYPE (SRLI, X_T1, X_T1, 4 - RISCV_ELF_LOG_WORD_BYTES); | |
349 | entry[6] = RISCV_ITYPE (LREG, X_T0, X_T0, RISCV_ELF_WORD_BYTES); | |
350 | entry[7] = RISCV_ITYPE (JALR, 0, X_T3, 0); | |
5ef23793 | 351 | |
0a1b45a2 | 352 | return true; |
e23eba97 NC |
353 | } |
354 | ||
355 | /* Generate a PLT entry. */ | |
356 | ||
0a1b45a2 | 357 | static bool |
5ef23793 JW |
358 | riscv_make_plt_entry (bfd *output_bfd, bfd_vma got, bfd_vma addr, |
359 | uint32_t *entry) | |
e23eba97 | 360 | { |
5ef23793 JW |
361 | /* RVE has no t3 register, so this won't work, and is not supported. */ |
362 | if (elf_elfheader (output_bfd)->e_flags & EF_RISCV_RVE) | |
363 | { | |
364 | _bfd_error_handler (_("%pB: warning: RVE PLT generation not supported"), | |
365 | output_bfd); | |
0a1b45a2 | 366 | return false; |
5ef23793 JW |
367 | } |
368 | ||
e23eba97 NC |
369 | /* auipc t3, %hi(.got.plt entry) |
370 | l[w|d] t3, %lo(.got.plt entry)(t3) | |
371 | jalr t1, t3 | |
dcd709e0 | 372 | nop */ |
e23eba97 NC |
373 | |
374 | entry[0] = RISCV_UTYPE (AUIPC, X_T3, RISCV_PCREL_HIGH_PART (got, addr)); | |
1d65abb5 | 375 | entry[1] = RISCV_ITYPE (LREG, X_T3, X_T3, RISCV_PCREL_LOW_PART (got, addr)); |
e23eba97 NC |
376 | entry[2] = RISCV_ITYPE (JALR, X_T1, X_T3, 0); |
377 | entry[3] = RISCV_NOP; | |
5ef23793 | 378 | |
0a1b45a2 | 379 | return true; |
e23eba97 NC |
380 | } |
381 | ||
382 | /* Create an entry in an RISC-V ELF linker hash table. */ | |
383 | ||
384 | static struct bfd_hash_entry * | |
385 | link_hash_newfunc (struct bfd_hash_entry *entry, | |
386 | struct bfd_hash_table *table, const char *string) | |
387 | { | |
388 | /* Allocate the structure if it has not already been allocated by a | |
389 | subclass. */ | |
390 | if (entry == NULL) | |
391 | { | |
392 | entry = | |
393 | bfd_hash_allocate (table, | |
394 | sizeof (struct riscv_elf_link_hash_entry)); | |
395 | if (entry == NULL) | |
396 | return entry; | |
397 | } | |
398 | ||
399 | /* Call the allocation method of the superclass. */ | |
400 | entry = _bfd_elf_link_hash_newfunc (entry, table, string); | |
401 | if (entry != NULL) | |
402 | { | |
403 | struct riscv_elf_link_hash_entry *eh; | |
404 | ||
405 | eh = (struct riscv_elf_link_hash_entry *) entry; | |
e23eba97 NC |
406 | eh->tls_type = GOT_UNKNOWN; |
407 | } | |
408 | ||
409 | return entry; | |
410 | } | |
411 | ||
02dd9d25 | 412 | /* Compute a hash of a local hash entry. We use elf_link_hash_entry |
dcd709e0 NC |
413 | for local symbol so that we can handle local STT_GNU_IFUNC symbols |
414 | as global symbol. We reuse indx and dynstr_index for local symbol | |
415 | hash since they aren't used by global symbols in this backend. */ | |
02dd9d25 NC |
416 | |
417 | static hashval_t | |
418 | riscv_elf_local_htab_hash (const void *ptr) | |
419 | { | |
420 | struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) ptr; | |
421 | return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index); | |
422 | } | |
423 | ||
424 | /* Compare local hash entries. */ | |
425 | ||
426 | static int | |
427 | riscv_elf_local_htab_eq (const void *ptr1, const void *ptr2) | |
428 | { | |
429 | struct elf_link_hash_entry *h1 = (struct elf_link_hash_entry *) ptr1; | |
430 | struct elf_link_hash_entry *h2 = (struct elf_link_hash_entry *) ptr2; | |
431 | ||
432 | return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index; | |
433 | } | |
434 | ||
435 | /* Find and/or create a hash entry for local symbol. */ | |
436 | ||
437 | static struct elf_link_hash_entry * | |
438 | riscv_elf_get_local_sym_hash (struct riscv_elf_link_hash_table *htab, | |
439 | bfd *abfd, const Elf_Internal_Rela *rel, | |
0a1b45a2 | 440 | bool create) |
02dd9d25 NC |
441 | { |
442 | struct riscv_elf_link_hash_entry eh, *ret; | |
443 | asection *sec = abfd->sections; | |
444 | hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id, | |
445 | ELFNN_R_SYM (rel->r_info)); | |
446 | void **slot; | |
447 | ||
448 | eh.elf.indx = sec->id; | |
449 | eh.elf.dynstr_index = ELFNN_R_SYM (rel->r_info); | |
450 | slot = htab_find_slot_with_hash (htab->loc_hash_table, &eh, h, | |
451 | create ? INSERT : NO_INSERT); | |
452 | ||
453 | if (!slot) | |
454 | return NULL; | |
455 | ||
456 | if (*slot) | |
457 | { | |
458 | ret = (struct riscv_elf_link_hash_entry *) *slot; | |
459 | return &ret->elf; | |
460 | } | |
461 | ||
462 | ret = (struct riscv_elf_link_hash_entry *) | |
463 | objalloc_alloc ((struct objalloc *) htab->loc_hash_memory, | |
464 | sizeof (struct riscv_elf_link_hash_entry)); | |
465 | if (ret) | |
466 | { | |
467 | memset (ret, 0, sizeof (*ret)); | |
468 | ret->elf.indx = sec->id; | |
469 | ret->elf.dynstr_index = ELFNN_R_SYM (rel->r_info); | |
470 | ret->elf.dynindx = -1; | |
471 | *slot = ret; | |
472 | } | |
473 | return &ret->elf; | |
474 | } | |
475 | ||
476 | /* Destroy a RISC-V elf linker hash table. */ | |
477 | ||
478 | static void | |
479 | riscv_elf_link_hash_table_free (bfd *obfd) | |
480 | { | |
481 | struct riscv_elf_link_hash_table *ret | |
482 | = (struct riscv_elf_link_hash_table *) obfd->link.hash; | |
483 | ||
484 | if (ret->loc_hash_table) | |
485 | htab_delete (ret->loc_hash_table); | |
486 | if (ret->loc_hash_memory) | |
487 | objalloc_free ((struct objalloc *) ret->loc_hash_memory); | |
488 | ||
489 | _bfd_elf_link_hash_table_free (obfd); | |
490 | } | |
491 | ||
e23eba97 NC |
492 | /* Create a RISC-V ELF linker hash table. */ |
493 | ||
494 | static struct bfd_link_hash_table * | |
495 | riscv_elf_link_hash_table_create (bfd *abfd) | |
496 | { | |
497 | struct riscv_elf_link_hash_table *ret; | |
986f0783 | 498 | size_t amt = sizeof (struct riscv_elf_link_hash_table); |
e23eba97 NC |
499 | |
500 | ret = (struct riscv_elf_link_hash_table *) bfd_zmalloc (amt); | |
501 | if (ret == NULL) | |
502 | return NULL; | |
503 | ||
504 | if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc, | |
505 | sizeof (struct riscv_elf_link_hash_entry), | |
506 | RISCV_ELF_DATA)) | |
507 | { | |
508 | free (ret); | |
509 | return NULL; | |
510 | } | |
511 | ||
fc3c5343 | 512 | ret->max_alignment = (bfd_vma) -1; |
0699f2d7 | 513 | ret->max_alignment_for_gp = (bfd_vma) -1; |
02dd9d25 NC |
514 | |
515 | /* Create hash table for local ifunc. */ | |
516 | ret->loc_hash_table = htab_try_create (1024, | |
517 | riscv_elf_local_htab_hash, | |
518 | riscv_elf_local_htab_eq, | |
519 | NULL); | |
520 | ret->loc_hash_memory = objalloc_create (); | |
521 | if (!ret->loc_hash_table || !ret->loc_hash_memory) | |
522 | { | |
523 | riscv_elf_link_hash_table_free (abfd); | |
524 | return NULL; | |
525 | } | |
526 | ret->elf.root.hash_table_free = riscv_elf_link_hash_table_free; | |
527 | ||
e23eba97 NC |
528 | return &ret->elf.root; |
529 | } | |
530 | ||
531 | /* Create the .got section. */ | |
532 | ||
0a1b45a2 | 533 | static bool |
e23eba97 NC |
534 | riscv_elf_create_got_section (bfd *abfd, struct bfd_link_info *info) |
535 | { | |
536 | flagword flags; | |
537 | asection *s, *s_got; | |
538 | struct elf_link_hash_entry *h; | |
539 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); | |
540 | struct elf_link_hash_table *htab = elf_hash_table (info); | |
541 | ||
542 | /* This function may be called more than once. */ | |
ce558b89 | 543 | if (htab->sgot != NULL) |
0a1b45a2 | 544 | return true; |
e23eba97 NC |
545 | |
546 | flags = bed->dynamic_sec_flags; | |
547 | ||
548 | s = bfd_make_section_anyway_with_flags (abfd, | |
549 | (bed->rela_plts_and_copies_p | |
550 | ? ".rela.got" : ".rel.got"), | |
551 | (bed->dynamic_sec_flags | |
552 | | SEC_READONLY)); | |
553 | if (s == NULL | |
fd361982 | 554 | || !bfd_set_section_alignment (s, bed->s->log_file_align)) |
0a1b45a2 | 555 | return false; |
e23eba97 NC |
556 | htab->srelgot = s; |
557 | ||
558 | s = s_got = bfd_make_section_anyway_with_flags (abfd, ".got", flags); | |
559 | if (s == NULL | |
fd361982 | 560 | || !bfd_set_section_alignment (s, bed->s->log_file_align)) |
0a1b45a2 | 561 | return false; |
e23eba97 NC |
562 | htab->sgot = s; |
563 | ||
564 | /* The first bit of the global offset table is the header. */ | |
565 | s->size += bed->got_header_size; | |
566 | ||
567 | if (bed->want_got_plt) | |
568 | { | |
569 | s = bfd_make_section_anyway_with_flags (abfd, ".got.plt", flags); | |
570 | if (s == NULL | |
fd361982 | 571 | || !bfd_set_section_alignment (s, bed->s->log_file_align)) |
0a1b45a2 | 572 | return false; |
e23eba97 NC |
573 | htab->sgotplt = s; |
574 | ||
575 | /* Reserve room for the header. */ | |
576 | s->size += GOTPLT_HEADER_SIZE; | |
577 | } | |
578 | ||
579 | if (bed->want_got_sym) | |
580 | { | |
581 | /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got | |
582 | section. We don't do this in the linker script because we don't want | |
583 | to define the symbol if we are not creating a global offset | |
584 | table. */ | |
585 | h = _bfd_elf_define_linkage_sym (abfd, info, s_got, | |
586 | "_GLOBAL_OFFSET_TABLE_"); | |
587 | elf_hash_table (info)->hgot = h; | |
588 | if (h == NULL) | |
0a1b45a2 | 589 | return false; |
e23eba97 NC |
590 | } |
591 | ||
0a1b45a2 | 592 | return true; |
e23eba97 NC |
593 | } |
594 | ||
595 | /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and | |
596 | .rela.bss sections in DYNOBJ, and set up shortcuts to them in our | |
597 | hash table. */ | |
598 | ||
0a1b45a2 | 599 | static bool |
e23eba97 NC |
600 | riscv_elf_create_dynamic_sections (bfd *dynobj, |
601 | struct bfd_link_info *info) | |
602 | { | |
603 | struct riscv_elf_link_hash_table *htab; | |
604 | ||
605 | htab = riscv_elf_hash_table (info); | |
606 | BFD_ASSERT (htab != NULL); | |
607 | ||
608 | if (!riscv_elf_create_got_section (dynobj, info)) | |
0a1b45a2 | 609 | return false; |
e23eba97 NC |
610 | |
611 | if (!_bfd_elf_create_dynamic_sections (dynobj, info)) | |
0a1b45a2 | 612 | return false; |
e23eba97 | 613 | |
e23eba97 NC |
614 | if (!bfd_link_pic (info)) |
615 | { | |
3e7bd7f2 JW |
616 | /* Technically, this section doesn't have contents. It is used as the |
617 | target of TLS copy relocs, to copy TLS data from shared libraries into | |
618 | the executable. However, if we don't mark it as loadable, then it | |
619 | matches the IS_TBSS test in ldlang.c, and there is no run-time address | |
620 | space allocated for it even though it has SEC_ALLOC. That test is | |
621 | correct for .tbss, but not correct for this section. There is also | |
622 | a second problem that having a section with no contents can only work | |
623 | if it comes after all sections with contents in the same segment, | |
624 | but the linker script does not guarantee that. This is just mixed in | |
625 | with other .tdata.* sections. We can fix both problems by lying and | |
626 | saying that there are contents. This section is expected to be small | |
627 | so this should not cause a significant extra program startup cost. */ | |
e23eba97 NC |
628 | htab->sdyntdata = |
629 | bfd_make_section_anyway_with_flags (dynobj, ".tdata.dyn", | |
13755f40 | 630 | (SEC_ALLOC | SEC_THREAD_LOCAL |
3e7bd7f2 JW |
631 | | SEC_LOAD | SEC_DATA |
632 | | SEC_HAS_CONTENTS | |
13755f40 | 633 | | SEC_LINKER_CREATED)); |
e23eba97 NC |
634 | } |
635 | ||
9d19e4fd AM |
636 | if (!htab->elf.splt || !htab->elf.srelplt || !htab->elf.sdynbss |
637 | || (!bfd_link_pic (info) && (!htab->elf.srelbss || !htab->sdyntdata))) | |
e23eba97 NC |
638 | abort (); |
639 | ||
0a1b45a2 | 640 | return true; |
e23eba97 NC |
641 | } |
642 | ||
643 | /* Copy the extra info we tack onto an elf_link_hash_entry. */ | |
644 | ||
645 | static void | |
646 | riscv_elf_copy_indirect_symbol (struct bfd_link_info *info, | |
647 | struct elf_link_hash_entry *dir, | |
648 | struct elf_link_hash_entry *ind) | |
649 | { | |
650 | struct riscv_elf_link_hash_entry *edir, *eind; | |
651 | ||
652 | edir = (struct riscv_elf_link_hash_entry *) dir; | |
653 | eind = (struct riscv_elf_link_hash_entry *) ind; | |
654 | ||
e23eba97 NC |
655 | if (ind->root.type == bfd_link_hash_indirect |
656 | && dir->got.refcount <= 0) | |
657 | { | |
658 | edir->tls_type = eind->tls_type; | |
659 | eind->tls_type = GOT_UNKNOWN; | |
660 | } | |
661 | _bfd_elf_link_hash_copy_indirect (info, dir, ind); | |
662 | } | |
663 | ||
0a1b45a2 | 664 | static bool |
e23eba97 NC |
665 | riscv_elf_record_tls_type (bfd *abfd, struct elf_link_hash_entry *h, |
666 | unsigned long symndx, char tls_type) | |
667 | { | |
668 | char *new_tls_type = &_bfd_riscv_elf_tls_type (abfd, h, symndx); | |
669 | ||
670 | *new_tls_type |= tls_type; | |
671 | if ((*new_tls_type & GOT_NORMAL) && (*new_tls_type & ~GOT_NORMAL)) | |
672 | { | |
673 | (*_bfd_error_handler) | |
871b3ab2 | 674 | (_("%pB: `%s' accessed both as normal and thread local symbol"), |
e23eba97 | 675 | abfd, h ? h->root.root.string : "<local>"); |
0a1b45a2 | 676 | return false; |
e23eba97 | 677 | } |
0a1b45a2 | 678 | return true; |
e23eba97 NC |
679 | } |
680 | ||
0a1b45a2 | 681 | static bool |
e23eba97 NC |
682 | riscv_elf_record_got_reference (bfd *abfd, struct bfd_link_info *info, |
683 | struct elf_link_hash_entry *h, long symndx) | |
684 | { | |
685 | struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info); | |
686 | Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
687 | ||
688 | if (htab->elf.sgot == NULL) | |
689 | { | |
690 | if (!riscv_elf_create_got_section (htab->elf.dynobj, info)) | |
0a1b45a2 | 691 | return false; |
e23eba97 NC |
692 | } |
693 | ||
694 | if (h != NULL) | |
695 | { | |
696 | h->got.refcount += 1; | |
0a1b45a2 | 697 | return true; |
e23eba97 NC |
698 | } |
699 | ||
700 | /* This is a global offset table entry for a local symbol. */ | |
701 | if (elf_local_got_refcounts (abfd) == NULL) | |
702 | { | |
703 | bfd_size_type size = symtab_hdr->sh_info * (sizeof (bfd_vma) + 1); | |
704 | if (!(elf_local_got_refcounts (abfd) = bfd_zalloc (abfd, size))) | |
0a1b45a2 | 705 | return false; |
e23eba97 NC |
706 | _bfd_riscv_elf_local_got_tls_type (abfd) |
707 | = (char *) (elf_local_got_refcounts (abfd) + symtab_hdr->sh_info); | |
708 | } | |
709 | elf_local_got_refcounts (abfd) [symndx] += 1; | |
710 | ||
0a1b45a2 | 711 | return true; |
e23eba97 NC |
712 | } |
713 | ||
0a1b45a2 | 714 | static bool |
e23eba97 NC |
715 | bad_static_reloc (bfd *abfd, unsigned r_type, struct elf_link_hash_entry *h) |
716 | { | |
f3185997 NC |
717 | reloc_howto_type * r = riscv_elf_rtype_to_howto (abfd, r_type); |
718 | ||
02dd9d25 NC |
719 | /* We propably can improve the information to tell users that they |
720 | should be recompile the code with -fPIC or -fPIE, just like what | |
721 | x86 does. */ | |
e23eba97 | 722 | (*_bfd_error_handler) |
871b3ab2 | 723 | (_("%pB: relocation %s against `%s' can not be used when making a shared " |
e23eba97 | 724 | "object; recompile with -fPIC"), |
f3185997 NC |
725 | abfd, r ? r->name : _("<unknown>"), |
726 | h != NULL ? h->root.root.string : "a local symbol"); | |
e23eba97 | 727 | bfd_set_error (bfd_error_bad_value); |
0a1b45a2 | 728 | return false; |
e23eba97 | 729 | } |
dcd709e0 | 730 | |
e23eba97 NC |
731 | /* Look through the relocs for a section during the first phase, and |
732 | allocate space in the global offset table or procedure linkage | |
733 | table. */ | |
734 | ||
0a1b45a2 | 735 | static bool |
e23eba97 NC |
736 | riscv_elf_check_relocs (bfd *abfd, struct bfd_link_info *info, |
737 | asection *sec, const Elf_Internal_Rela *relocs) | |
738 | { | |
739 | struct riscv_elf_link_hash_table *htab; | |
740 | Elf_Internal_Shdr *symtab_hdr; | |
741 | struct elf_link_hash_entry **sym_hashes; | |
742 | const Elf_Internal_Rela *rel; | |
743 | asection *sreloc = NULL; | |
744 | ||
745 | if (bfd_link_relocatable (info)) | |
0a1b45a2 | 746 | return true; |
e23eba97 NC |
747 | |
748 | htab = riscv_elf_hash_table (info); | |
749 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
750 | sym_hashes = elf_sym_hashes (abfd); | |
751 | ||
752 | if (htab->elf.dynobj == NULL) | |
753 | htab->elf.dynobj = abfd; | |
754 | ||
755 | for (rel = relocs; rel < relocs + sec->reloc_count; rel++) | |
756 | { | |
757 | unsigned int r_type; | |
d42c267e | 758 | unsigned int r_symndx; |
e23eba97 | 759 | struct elf_link_hash_entry *h; |
b679fb48 | 760 | bool is_abs_symbol = false; |
e23eba97 NC |
761 | |
762 | r_symndx = ELFNN_R_SYM (rel->r_info); | |
763 | r_type = ELFNN_R_TYPE (rel->r_info); | |
764 | ||
765 | if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) | |
766 | { | |
871b3ab2 | 767 | (*_bfd_error_handler) (_("%pB: bad symbol index: %d"), |
e23eba97 | 768 | abfd, r_symndx); |
0a1b45a2 | 769 | return false; |
e23eba97 NC |
770 | } |
771 | ||
772 | if (r_symndx < symtab_hdr->sh_info) | |
02dd9d25 NC |
773 | { |
774 | /* A local symbol. */ | |
775 | Elf_Internal_Sym *isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache, | |
776 | abfd, r_symndx); | |
777 | if (isym == NULL) | |
0a1b45a2 | 778 | return false; |
02dd9d25 | 779 | |
b679fb48 NC |
780 | is_abs_symbol = isym->st_shndx == SHN_ABS ? true : false; |
781 | ||
02dd9d25 NC |
782 | /* Check relocation against local STT_GNU_IFUNC symbol. */ |
783 | if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) | |
784 | { | |
0a1b45a2 | 785 | h = riscv_elf_get_local_sym_hash (htab, abfd, rel, true); |
02dd9d25 | 786 | if (h == NULL) |
0a1b45a2 | 787 | return false; |
02dd9d25 NC |
788 | |
789 | /* Fake STT_GNU_IFUNC global symbol. */ | |
790 | h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr, | |
791 | isym, NULL); | |
792 | h->type = STT_GNU_IFUNC; | |
793 | h->def_regular = 1; | |
794 | h->ref_regular = 1; | |
795 | h->forced_local = 1; | |
796 | h->root.type = bfd_link_hash_defined; | |
797 | } | |
798 | else | |
799 | h = NULL; | |
800 | } | |
e23eba97 NC |
801 | else |
802 | { | |
803 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
804 | while (h->root.type == bfd_link_hash_indirect | |
805 | || h->root.type == bfd_link_hash_warning) | |
806 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
b679fb48 NC |
807 | |
808 | is_abs_symbol = bfd_is_abs_symbol (&h->root) ? true : false; | |
e23eba97 NC |
809 | } |
810 | ||
02dd9d25 NC |
811 | if (h != NULL) |
812 | { | |
813 | switch (r_type) | |
814 | { | |
815 | case R_RISCV_32: | |
816 | case R_RISCV_64: | |
817 | case R_RISCV_CALL: | |
818 | case R_RISCV_CALL_PLT: | |
819 | case R_RISCV_HI20: | |
820 | case R_RISCV_GOT_HI20: | |
821 | case R_RISCV_PCREL_HI20: | |
822 | /* Create the ifunc sections, iplt and ipltgot, for static | |
823 | executables. */ | |
824 | if (h->type == STT_GNU_IFUNC | |
825 | && !_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info)) | |
0a1b45a2 | 826 | return false; |
02dd9d25 NC |
827 | break; |
828 | ||
829 | default: | |
830 | break; | |
831 | } | |
832 | ||
833 | /* It is referenced by a non-shared object. */ | |
834 | h->ref_regular = 1; | |
835 | } | |
836 | ||
e23eba97 NC |
837 | switch (r_type) |
838 | { | |
839 | case R_RISCV_TLS_GD_HI20: | |
840 | if (!riscv_elf_record_got_reference (abfd, info, h, r_symndx) | |
841 | || !riscv_elf_record_tls_type (abfd, h, r_symndx, GOT_TLS_GD)) | |
0a1b45a2 | 842 | return false; |
e23eba97 NC |
843 | break; |
844 | ||
845 | case R_RISCV_TLS_GOT_HI20: | |
225df051 | 846 | if (bfd_link_dll (info)) |
e23eba97 NC |
847 | info->flags |= DF_STATIC_TLS; |
848 | if (!riscv_elf_record_got_reference (abfd, info, h, r_symndx) | |
849 | || !riscv_elf_record_tls_type (abfd, h, r_symndx, GOT_TLS_IE)) | |
0a1b45a2 | 850 | return false; |
e23eba97 NC |
851 | break; |
852 | ||
853 | case R_RISCV_GOT_HI20: | |
854 | if (!riscv_elf_record_got_reference (abfd, info, h, r_symndx) | |
855 | || !riscv_elf_record_tls_type (abfd, h, r_symndx, GOT_NORMAL)) | |
0a1b45a2 | 856 | return false; |
e23eba97 NC |
857 | break; |
858 | ||
3b1450b3 | 859 | case R_RISCV_CALL: |
e23eba97 | 860 | case R_RISCV_CALL_PLT: |
dcd709e0 NC |
861 | /* These symbol requires a procedure linkage table entry. |
862 | We actually build the entry in adjust_dynamic_symbol, | |
3b1450b3 | 863 | because these might be a case of linking PIC code without |
e23eba97 NC |
864 | linking in any dynamic objects, in which case we don't |
865 | need to generate a procedure linkage table after all. */ | |
866 | ||
3b1450b3 NC |
867 | /* If it is a local symbol, then we resolve it directly |
868 | without creating a PLT entry. */ | |
869 | if (h == NULL) | |
870 | continue; | |
871 | ||
872 | h->needs_plt = 1; | |
873 | h->plt.refcount += 1; | |
e23eba97 NC |
874 | break; |
875 | ||
02dd9d25 NC |
876 | case R_RISCV_PCREL_HI20: |
877 | if (h != NULL | |
878 | && h->type == STT_GNU_IFUNC) | |
879 | { | |
880 | h->non_got_ref = 1; | |
881 | h->pointer_equality_needed = 1; | |
882 | ||
883 | /* We don't use the PCREL_HI20 in the data section, | |
884 | so we always need the plt when it refers to | |
885 | ifunc symbol. */ | |
886 | h->plt.refcount += 1; | |
887 | } | |
890744e8 PD |
888 | |
889 | /* The non-preemptible absolute symbol shouldn't be referneced with | |
890 | pc-relative relocation when generating shared object. However, | |
891 | PCREL_HI20/LO12 relocs are always bind locally when generating | |
892 | shared object, so all absolute symbol referenced need to be | |
893 | disallowed, except they are defined in linker script. | |
894 | ||
895 | Maybe we should add this check for all pc-relative relocations, | |
896 | please see pr28789 and pr25749 for details. */ | |
897 | if (bfd_link_pic (info) | |
898 | /* (h == NULL || SYMBOL_REFERENCES_LOCAL (info, h)) */ | |
899 | && is_abs_symbol) | |
900 | { | |
901 | if (h != NULL && (h)->root.ldscript_def) | |
902 | /* Disallow the absolute symbol defined in linker script here | |
903 | will cause the glibc-linux toolchain build failed, so regard | |
904 | them as pc-relative symbols, just like what x86 did. */ | |
905 | ; | |
906 | else | |
907 | { | |
908 | const char *name; | |
909 | if (h->root.root.string) | |
910 | name = h->root.root.string; | |
911 | else | |
912 | { | |
913 | Elf_Internal_Sym *sym; | |
914 | sym = bfd_sym_from_r_symndx (&htab->elf.sym_cache, abfd, | |
915 | r_symndx); | |
916 | name = bfd_elf_sym_name (abfd, symtab_hdr, sym, NULL); | |
917 | } | |
918 | ||
919 | reloc_howto_type *r_t = | |
920 | riscv_elf_rtype_to_howto (abfd, r_type); | |
921 | _bfd_error_handler | |
922 | (_("%pB: relocation %s against absolute symbol `%s' can " | |
923 | "not be used when making a shared object"), | |
924 | abfd, r_t ? r_t->name : _("<unknown>"), name); | |
925 | bfd_set_error (bfd_error_bad_value); | |
926 | return false; | |
927 | } | |
928 | } | |
02dd9d25 NC |
929 | /* Fall through. */ |
930 | ||
e23eba97 NC |
931 | case R_RISCV_JAL: |
932 | case R_RISCV_BRANCH: | |
933 | case R_RISCV_RVC_BRANCH: | |
934 | case R_RISCV_RVC_JUMP: | |
02dd9d25 NC |
935 | /* In shared libraries and pie, these relocs are known |
936 | to bind locally. */ | |
e23eba97 NC |
937 | if (bfd_link_pic (info)) |
938 | break; | |
939 | goto static_reloc; | |
940 | ||
941 | case R_RISCV_TPREL_HI20: | |
225df051 | 942 | /* This is not allowed in the pic, but okay in pie. */ |
e23eba97 NC |
943 | if (!bfd_link_executable (info)) |
944 | return bad_static_reloc (abfd, r_type, h); | |
945 | if (h != NULL) | |
946 | riscv_elf_record_tls_type (abfd, h, r_symndx, GOT_TLS_LE); | |
225df051 | 947 | break; |
e23eba97 NC |
948 | |
949 | case R_RISCV_HI20: | |
950 | if (bfd_link_pic (info)) | |
951 | return bad_static_reloc (abfd, r_type, h); | |
b679fb48 NC |
952 | goto static_reloc; |
953 | ||
954 | case R_RISCV_32: | |
955 | if (ARCH_SIZE > 32 | |
956 | && bfd_link_pic (info) | |
957 | && (sec->flags & SEC_ALLOC) != 0) | |
958 | { | |
959 | if (is_abs_symbol) | |
960 | break; | |
961 | ||
962 | reloc_howto_type *r_t = riscv_elf_rtype_to_howto (abfd, r_type); | |
963 | _bfd_error_handler | |
964 | (_("%pB: relocation %s against non-absolute symbol `%s' can " | |
965 | "not be used in RVNN when making a shared object"), | |
966 | abfd, r_t ? r_t->name : _("<unknown>"), | |
967 | h != NULL ? h->root.root.string : "a local symbol"); | |
968 | bfd_set_error (bfd_error_bad_value); | |
969 | return false; | |
970 | } | |
971 | goto static_reloc; | |
e23eba97 NC |
972 | |
973 | case R_RISCV_COPY: | |
974 | case R_RISCV_JUMP_SLOT: | |
975 | case R_RISCV_RELATIVE: | |
976 | case R_RISCV_64: | |
e23eba97 NC |
977 | /* Fall through. */ |
978 | ||
979 | static_reloc: | |
e23eba97 | 980 | |
02dd9d25 NC |
981 | if (h != NULL |
982 | && (!bfd_link_pic (info) | |
983 | || h->type == STT_GNU_IFUNC)) | |
e23eba97 | 984 | { |
02dd9d25 NC |
985 | /* This reloc might not bind locally. */ |
986 | h->non_got_ref = 1; | |
987 | h->pointer_equality_needed = 1; | |
988 | ||
989 | if (!h->def_regular | |
990 | || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0) | |
991 | { | |
992 | /* We may need a .plt entry if the symbol is a function | |
993 | defined in a shared lib or is a function referenced | |
994 | from the code or read-only section. */ | |
995 | h->plt.refcount += 1; | |
996 | } | |
e23eba97 NC |
997 | } |
998 | ||
23068b02 NC |
999 | reloc_howto_type *r = riscv_elf_rtype_to_howto (abfd, r_type); |
1000 | if (RISCV_NEED_DYNAMIC_RELOC (r->pc_relative, info, h, sec)) | |
e23eba97 | 1001 | { |
3bf083ed AM |
1002 | struct elf_dyn_relocs *p; |
1003 | struct elf_dyn_relocs **head; | |
e23eba97 NC |
1004 | |
1005 | /* When creating a shared object, we must copy these | |
1006 | relocs into the output file. We create a reloc | |
1007 | section in dynobj and make room for the reloc. */ | |
1008 | if (sreloc == NULL) | |
1009 | { | |
1010 | sreloc = _bfd_elf_make_dynamic_reloc_section | |
1011 | (sec, htab->elf.dynobj, RISCV_ELF_LOG_WORD_BYTES, | |
0a1b45a2 | 1012 | abfd, /*rela?*/ true); |
e23eba97 NC |
1013 | |
1014 | if (sreloc == NULL) | |
0a1b45a2 | 1015 | return false; |
e23eba97 NC |
1016 | } |
1017 | ||
1018 | /* If this is a global symbol, we count the number of | |
1019 | relocations we need for this symbol. */ | |
1020 | if (h != NULL) | |
190eb1dd | 1021 | head = &h->dyn_relocs; |
e23eba97 NC |
1022 | else |
1023 | { | |
1024 | /* Track dynamic relocs needed for local syms too. | |
1025 | We really need local syms available to do this | |
1026 | easily. Oh well. */ | |
1027 | ||
1028 | asection *s; | |
1029 | void *vpp; | |
1030 | Elf_Internal_Sym *isym; | |
1031 | ||
f1dfbfdb | 1032 | isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache, |
e23eba97 NC |
1033 | abfd, r_symndx); |
1034 | if (isym == NULL) | |
0a1b45a2 | 1035 | return false; |
e23eba97 NC |
1036 | |
1037 | s = bfd_section_from_elf_index (abfd, isym->st_shndx); | |
1038 | if (s == NULL) | |
1039 | s = sec; | |
1040 | ||
1041 | vpp = &elf_section_data (s)->local_dynrel; | |
3bf083ed | 1042 | head = (struct elf_dyn_relocs **) vpp; |
e23eba97 NC |
1043 | } |
1044 | ||
1045 | p = *head; | |
1046 | if (p == NULL || p->sec != sec) | |
1047 | { | |
986f0783 | 1048 | size_t amt = sizeof *p; |
3bf083ed | 1049 | p = ((struct elf_dyn_relocs *) |
e23eba97 NC |
1050 | bfd_alloc (htab->elf.dynobj, amt)); |
1051 | if (p == NULL) | |
0a1b45a2 | 1052 | return false; |
e23eba97 NC |
1053 | p->next = *head; |
1054 | *head = p; | |
1055 | p->sec = sec; | |
1056 | p->count = 0; | |
1057 | p->pc_count = 0; | |
1058 | } | |
1059 | ||
1060 | p->count += 1; | |
f3185997 | 1061 | p->pc_count += r == NULL ? 0 : r->pc_relative; |
e23eba97 NC |
1062 | } |
1063 | ||
1064 | break; | |
1065 | ||
e23eba97 NC |
1066 | default: |
1067 | break; | |
1068 | } | |
1069 | } | |
1070 | ||
0a1b45a2 | 1071 | return true; |
e23eba97 NC |
1072 | } |
1073 | ||
e23eba97 NC |
1074 | /* Adjust a symbol defined by a dynamic object and referenced by a |
1075 | regular object. The current definition is in some section of the | |
1076 | dynamic object, but we're not including those sections. We have to | |
1077 | change the definition to something the rest of the link can | |
1078 | understand. */ | |
1079 | ||
0a1b45a2 | 1080 | static bool |
e23eba97 NC |
1081 | riscv_elf_adjust_dynamic_symbol (struct bfd_link_info *info, |
1082 | struct elf_link_hash_entry *h) | |
1083 | { | |
1084 | struct riscv_elf_link_hash_table *htab; | |
1085 | struct riscv_elf_link_hash_entry * eh; | |
e23eba97 | 1086 | bfd *dynobj; |
5474d94f | 1087 | asection *s, *srel; |
e23eba97 NC |
1088 | |
1089 | htab = riscv_elf_hash_table (info); | |
1090 | BFD_ASSERT (htab != NULL); | |
1091 | ||
1092 | dynobj = htab->elf.dynobj; | |
1093 | ||
1094 | /* Make sure we know what is going on here. */ | |
1095 | BFD_ASSERT (dynobj != NULL | |
1096 | && (h->needs_plt | |
1097 | || h->type == STT_GNU_IFUNC | |
60d67dc8 | 1098 | || h->is_weakalias |
e23eba97 NC |
1099 | || (h->def_dynamic |
1100 | && h->ref_regular | |
1101 | && !h->def_regular))); | |
1102 | ||
1103 | /* If this is a function, put it in the procedure linkage table. We | |
1104 | will fill in the contents of the procedure linkage table later | |
1105 | (although we could actually do it here). */ | |
1106 | if (h->type == STT_FUNC || h->type == STT_GNU_IFUNC || h->needs_plt) | |
1107 | { | |
1108 | if (h->plt.refcount <= 0 | |
02dd9d25 NC |
1109 | || (h->type != STT_GNU_IFUNC |
1110 | && (SYMBOL_CALLS_LOCAL (info, h) | |
1111 | || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT | |
1112 | && h->root.type == bfd_link_hash_undefweak)))) | |
e23eba97 NC |
1113 | { |
1114 | /* This case can occur if we saw a R_RISCV_CALL_PLT reloc in an | |
1115 | input file, but the symbol was never referred to by a dynamic | |
1116 | object, or if all references were garbage collected. In such | |
1117 | a case, we don't actually need to build a PLT entry. */ | |
1118 | h->plt.offset = (bfd_vma) -1; | |
1119 | h->needs_plt = 0; | |
1120 | } | |
1121 | ||
0a1b45a2 | 1122 | return true; |
e23eba97 NC |
1123 | } |
1124 | else | |
1125 | h->plt.offset = (bfd_vma) -1; | |
1126 | ||
1127 | /* If this is a weak symbol, and there is a real definition, the | |
1128 | processor independent code will have arranged for us to see the | |
1129 | real definition first, and we can just use the same value. */ | |
60d67dc8 | 1130 | if (h->is_weakalias) |
e23eba97 | 1131 | { |
60d67dc8 AM |
1132 | struct elf_link_hash_entry *def = weakdef (h); |
1133 | BFD_ASSERT (def->root.type == bfd_link_hash_defined); | |
1134 | h->root.u.def.section = def->root.u.def.section; | |
1135 | h->root.u.def.value = def->root.u.def.value; | |
0a1b45a2 | 1136 | return true; |
e23eba97 NC |
1137 | } |
1138 | ||
1139 | /* This is a reference to a symbol defined by a dynamic object which | |
1140 | is not a function. */ | |
1141 | ||
1142 | /* If we are creating a shared library, we must presume that the | |
1143 | only references to the symbol are via the global offset table. | |
1144 | For such cases we need not do anything here; the relocations will | |
1145 | be handled correctly by relocate_section. */ | |
1146 | if (bfd_link_pic (info)) | |
0a1b45a2 | 1147 | return true; |
e23eba97 NC |
1148 | |
1149 | /* If there are no references to this symbol that do not use the | |
1150 | GOT, we don't need to generate a copy reloc. */ | |
1151 | if (!h->non_got_ref) | |
0a1b45a2 | 1152 | return true; |
e23eba97 NC |
1153 | |
1154 | /* If -z nocopyreloc was given, we won't generate them either. */ | |
1155 | if (info->nocopyreloc) | |
1156 | { | |
1157 | h->non_got_ref = 0; | |
0a1b45a2 | 1158 | return true; |
e23eba97 NC |
1159 | } |
1160 | ||
3bf083ed | 1161 | /* If we don't find any dynamic relocs in read-only sections, then |
e23eba97 | 1162 | we'll be keeping the dynamic relocs and avoiding the copy reloc. */ |
5dbc8b37 | 1163 | if (!_bfd_elf_readonly_dynrelocs (h)) |
e23eba97 NC |
1164 | { |
1165 | h->non_got_ref = 0; | |
0a1b45a2 | 1166 | return true; |
e23eba97 NC |
1167 | } |
1168 | ||
1169 | /* We must allocate the symbol in our .dynbss section, which will | |
1170 | become part of the .bss section of the executable. There will be | |
1171 | an entry for this symbol in the .dynsym section. The dynamic | |
1172 | object will contain position independent code, so all references | |
1173 | from the dynamic object to this symbol will go through the global | |
1174 | offset table. The dynamic linker will use the .dynsym entry to | |
1175 | determine the address it must put in the global offset table, so | |
1176 | both the dynamic object and the regular object will refer to the | |
1177 | same memory location for the variable. */ | |
1178 | ||
1179 | /* We must generate a R_RISCV_COPY reloc to tell the dynamic linker | |
1180 | to copy the initial value out of the dynamic object and into the | |
1181 | runtime process image. We need to remember the offset into the | |
1182 | .rel.bss section we are going to use. */ | |
3bf083ed | 1183 | eh = (struct riscv_elf_link_hash_entry *) h; |
3df5cd13 AW |
1184 | if (eh->tls_type & ~GOT_NORMAL) |
1185 | { | |
1186 | s = htab->sdyntdata; | |
1187 | srel = htab->elf.srelbss; | |
1188 | } | |
1189 | else if ((h->root.u.def.section->flags & SEC_READONLY) != 0) | |
5474d94f AM |
1190 | { |
1191 | s = htab->elf.sdynrelro; | |
1192 | srel = htab->elf.sreldynrelro; | |
1193 | } | |
1194 | else | |
1195 | { | |
1196 | s = htab->elf.sdynbss; | |
1197 | srel = htab->elf.srelbss; | |
1198 | } | |
e23eba97 NC |
1199 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) |
1200 | { | |
5474d94f | 1201 | srel->size += sizeof (ElfNN_External_Rela); |
e23eba97 NC |
1202 | h->needs_copy = 1; |
1203 | } | |
1204 | ||
5474d94f | 1205 | return _bfd_elf_adjust_dynamic_copy (info, h, s); |
e23eba97 NC |
1206 | } |
1207 | ||
1208 | /* Allocate space in .plt, .got and associated reloc sections for | |
1209 | dynamic relocs. */ | |
1210 | ||
0a1b45a2 | 1211 | static bool |
e23eba97 NC |
1212 | allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) |
1213 | { | |
1214 | struct bfd_link_info *info; | |
1215 | struct riscv_elf_link_hash_table *htab; | |
3bf083ed | 1216 | struct elf_dyn_relocs *p; |
e23eba97 NC |
1217 | |
1218 | if (h->root.type == bfd_link_hash_indirect) | |
0a1b45a2 | 1219 | return true; |
e23eba97 NC |
1220 | |
1221 | info = (struct bfd_link_info *) inf; | |
1222 | htab = riscv_elf_hash_table (info); | |
1223 | BFD_ASSERT (htab != NULL); | |
1224 | ||
18b98722 NC |
1225 | /* When we are generating pde, make sure gp symbol is output as a |
1226 | dynamic symbol. Then ld.so can set the gp register earlier, before | |
1227 | resolving the ifunc. */ | |
1228 | if (!bfd_link_pic (info) | |
1229 | && htab->elf.dynamic_sections_created | |
1230 | && strcmp (h->root.root.string, RISCV_GP_SYMBOL) == 0 | |
1231 | && !bfd_elf_link_record_dynamic_symbol (info, h)) | |
0a1b45a2 | 1232 | return false; |
18b98722 | 1233 | |
02dd9d25 NC |
1234 | /* Since STT_GNU_IFUNC symbols must go through PLT, we handle them |
1235 | in the allocate_ifunc_dynrelocs and allocate_local_ifunc_dynrelocs, | |
1236 | if they are defined and referenced in a non-shared object. */ | |
1237 | if (h->type == STT_GNU_IFUNC | |
1238 | && h->def_regular) | |
0a1b45a2 | 1239 | return true; |
02dd9d25 NC |
1240 | else if (htab->elf.dynamic_sections_created |
1241 | && h->plt.refcount > 0) | |
e23eba97 NC |
1242 | { |
1243 | /* Make sure this symbol is output as a dynamic symbol. | |
1244 | Undefined weak syms won't yet be marked as dynamic. */ | |
1245 | if (h->dynindx == -1 | |
1246 | && !h->forced_local) | |
1247 | { | |
1248 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) | |
0a1b45a2 | 1249 | return false; |
e23eba97 NC |
1250 | } |
1251 | ||
1252 | if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, bfd_link_pic (info), h)) | |
1253 | { | |
1254 | asection *s = htab->elf.splt; | |
1255 | ||
1256 | if (s->size == 0) | |
1257 | s->size = PLT_HEADER_SIZE; | |
1258 | ||
1259 | h->plt.offset = s->size; | |
1260 | ||
1261 | /* Make room for this entry. */ | |
1262 | s->size += PLT_ENTRY_SIZE; | |
1263 | ||
1264 | /* We also need to make an entry in the .got.plt section. */ | |
1265 | htab->elf.sgotplt->size += GOT_ENTRY_SIZE; | |
1266 | ||
1267 | /* We also need to make an entry in the .rela.plt section. */ | |
1268 | htab->elf.srelplt->size += sizeof (ElfNN_External_Rela); | |
1269 | ||
1270 | /* If this symbol is not defined in a regular file, and we are | |
1271 | not generating a shared library, then set the symbol to this | |
1272 | location in the .plt. This is required to make function | |
1273 | pointers compare as equal between the normal executable and | |
1274 | the shared library. */ | |
1275 | if (! bfd_link_pic (info) | |
1276 | && !h->def_regular) | |
1277 | { | |
1278 | h->root.u.def.section = s; | |
1279 | h->root.u.def.value = h->plt.offset; | |
1280 | } | |
8155b853 NC |
1281 | |
1282 | /* If the symbol has STO_RISCV_VARIANT_CC flag, then raise the | |
1283 | variant_cc flag of riscv_elf_link_hash_table. */ | |
1284 | if (h->other & STO_RISCV_VARIANT_CC) | |
1285 | htab->variant_cc = 1; | |
e23eba97 NC |
1286 | } |
1287 | else | |
1288 | { | |
1289 | h->plt.offset = (bfd_vma) -1; | |
1290 | h->needs_plt = 0; | |
1291 | } | |
1292 | } | |
1293 | else | |
1294 | { | |
1295 | h->plt.offset = (bfd_vma) -1; | |
1296 | h->needs_plt = 0; | |
1297 | } | |
1298 | ||
1299 | if (h->got.refcount > 0) | |
1300 | { | |
1301 | asection *s; | |
0a1b45a2 | 1302 | bool dyn; |
e23eba97 NC |
1303 | int tls_type = riscv_elf_hash_entry (h)->tls_type; |
1304 | ||
1305 | /* Make sure this symbol is output as a dynamic symbol. | |
1306 | Undefined weak syms won't yet be marked as dynamic. */ | |
1307 | if (h->dynindx == -1 | |
1308 | && !h->forced_local) | |
1309 | { | |
1310 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) | |
0a1b45a2 | 1311 | return false; |
e23eba97 NC |
1312 | } |
1313 | ||
1314 | s = htab->elf.sgot; | |
1315 | h->got.offset = s->size; | |
1316 | dyn = htab->elf.dynamic_sections_created; | |
1317 | if (tls_type & (GOT_TLS_GD | GOT_TLS_IE)) | |
1318 | { | |
20ef84ed NC |
1319 | int indx = 0; |
1320 | bool need_reloc = false; | |
1321 | RISCV_TLS_GD_IE_NEED_DYN_RELOC(info, dyn, h, indx, need_reloc); | |
1322 | ||
e23eba97 NC |
1323 | /* TLS_GD needs two dynamic relocs and two GOT slots. */ |
1324 | if (tls_type & GOT_TLS_GD) | |
1325 | { | |
1326 | s->size += 2 * RISCV_ELF_WORD_BYTES; | |
20ef84ed NC |
1327 | if (need_reloc) |
1328 | htab->elf.srelgot->size += 2 * sizeof (ElfNN_External_Rela); | |
e23eba97 NC |
1329 | } |
1330 | ||
1331 | /* TLS_IE needs one dynamic reloc and one GOT slot. */ | |
1332 | if (tls_type & GOT_TLS_IE) | |
1333 | { | |
1334 | s->size += RISCV_ELF_WORD_BYTES; | |
20ef84ed NC |
1335 | if (need_reloc) |
1336 | htab->elf.srelgot->size += sizeof (ElfNN_External_Rela); | |
e23eba97 NC |
1337 | } |
1338 | } | |
1339 | else | |
1340 | { | |
1341 | s->size += RISCV_ELF_WORD_BYTES; | |
6487709f JW |
1342 | if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, bfd_link_pic (info), h) |
1343 | && ! UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)) | |
e23eba97 NC |
1344 | htab->elf.srelgot->size += sizeof (ElfNN_External_Rela); |
1345 | } | |
1346 | } | |
1347 | else | |
1348 | h->got.offset = (bfd_vma) -1; | |
1349 | ||
190eb1dd | 1350 | if (h->dyn_relocs == NULL) |
0a1b45a2 | 1351 | return true; |
e23eba97 NC |
1352 | |
1353 | /* In the shared -Bsymbolic case, discard space allocated for | |
1354 | dynamic pc-relative relocs against symbols which turn out to be | |
1355 | defined in regular objects. For the normal shared case, discard | |
1356 | space for pc-relative relocs that have become local due to symbol | |
1357 | visibility changes. */ | |
1358 | ||
1359 | if (bfd_link_pic (info)) | |
1360 | { | |
1361 | if (SYMBOL_CALLS_LOCAL (info, h)) | |
1362 | { | |
3bf083ed | 1363 | struct elf_dyn_relocs **pp; |
e23eba97 | 1364 | |
190eb1dd | 1365 | for (pp = &h->dyn_relocs; (p = *pp) != NULL; ) |
e23eba97 NC |
1366 | { |
1367 | p->count -= p->pc_count; | |
1368 | p->pc_count = 0; | |
1369 | if (p->count == 0) | |
1370 | *pp = p->next; | |
1371 | else | |
1372 | pp = &p->next; | |
1373 | } | |
1374 | } | |
1375 | ||
1376 | /* Also discard relocs on undefined weak syms with non-default | |
1377 | visibility. */ | |
190eb1dd | 1378 | if (h->dyn_relocs != NULL |
e23eba97 NC |
1379 | && h->root.type == bfd_link_hash_undefweak) |
1380 | { | |
6487709f JW |
1381 | if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT |
1382 | || UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)) | |
190eb1dd | 1383 | h->dyn_relocs = NULL; |
e23eba97 NC |
1384 | |
1385 | /* Make sure undefined weak symbols are output as a dynamic | |
1386 | symbol in PIEs. */ | |
1387 | else if (h->dynindx == -1 | |
1388 | && !h->forced_local) | |
1389 | { | |
1390 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) | |
0a1b45a2 | 1391 | return false; |
e23eba97 NC |
1392 | } |
1393 | } | |
1394 | } | |
1395 | else | |
1396 | { | |
1397 | /* For the non-shared case, discard space for relocs against | |
1398 | symbols which turn out to need copy relocs or are not | |
1399 | dynamic. */ | |
1400 | ||
1401 | if (!h->non_got_ref | |
1402 | && ((h->def_dynamic | |
1403 | && !h->def_regular) | |
1404 | || (htab->elf.dynamic_sections_created | |
1405 | && (h->root.type == bfd_link_hash_undefweak | |
1406 | || h->root.type == bfd_link_hash_undefined)))) | |
1407 | { | |
1408 | /* Make sure this symbol is output as a dynamic symbol. | |
1409 | Undefined weak syms won't yet be marked as dynamic. */ | |
1410 | if (h->dynindx == -1 | |
1411 | && !h->forced_local) | |
1412 | { | |
1413 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) | |
0a1b45a2 | 1414 | return false; |
e23eba97 NC |
1415 | } |
1416 | ||
1417 | /* If that succeeded, we know we'll be keeping all the | |
1418 | relocs. */ | |
1419 | if (h->dynindx != -1) | |
1420 | goto keep; | |
1421 | } | |
1422 | ||
190eb1dd | 1423 | h->dyn_relocs = NULL; |
e23eba97 NC |
1424 | |
1425 | keep: ; | |
1426 | } | |
1427 | ||
1428 | /* Finally, allocate space. */ | |
190eb1dd | 1429 | for (p = h->dyn_relocs; p != NULL; p = p->next) |
e23eba97 NC |
1430 | { |
1431 | asection *sreloc = elf_section_data (p->sec)->sreloc; | |
1432 | sreloc->size += p->count * sizeof (ElfNN_External_Rela); | |
1433 | } | |
1434 | ||
0a1b45a2 | 1435 | return true; |
e23eba97 NC |
1436 | } |
1437 | ||
02dd9d25 NC |
1438 | /* Allocate space in .plt, .got and associated reloc sections for |
1439 | ifunc dynamic relocs. */ | |
1440 | ||
0a1b45a2 | 1441 | static bool |
02dd9d25 NC |
1442 | allocate_ifunc_dynrelocs (struct elf_link_hash_entry *h, |
1443 | void *inf) | |
1444 | { | |
1445 | struct bfd_link_info *info; | |
1446 | ||
1447 | if (h->root.type == bfd_link_hash_indirect) | |
0a1b45a2 | 1448 | return true; |
02dd9d25 NC |
1449 | |
1450 | if (h->root.type == bfd_link_hash_warning) | |
1451 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
1452 | ||
1453 | info = (struct bfd_link_info *) inf; | |
1454 | ||
1455 | /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it | |
1456 | here if it is defined and referenced in a non-shared object. */ | |
1457 | if (h->type == STT_GNU_IFUNC | |
1458 | && h->def_regular) | |
1459 | return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, | |
1460 | &h->dyn_relocs, | |
1461 | PLT_ENTRY_SIZE, | |
1462 | PLT_HEADER_SIZE, | |
1463 | GOT_ENTRY_SIZE, | |
0a1b45a2 AM |
1464 | true); |
1465 | return true; | |
02dd9d25 NC |
1466 | } |
1467 | ||
1468 | /* Allocate space in .plt, .got and associated reloc sections for | |
1469 | local ifunc dynamic relocs. */ | |
1470 | ||
1201fda6 | 1471 | static int |
02dd9d25 NC |
1472 | allocate_local_ifunc_dynrelocs (void **slot, void *inf) |
1473 | { | |
1474 | struct elf_link_hash_entry *h | |
1475 | = (struct elf_link_hash_entry *) *slot; | |
1476 | ||
1477 | if (h->type != STT_GNU_IFUNC | |
1478 | || !h->def_regular | |
1479 | || !h->ref_regular | |
1480 | || !h->forced_local | |
1481 | || h->root.type != bfd_link_hash_defined) | |
1482 | abort (); | |
1483 | ||
1484 | return allocate_ifunc_dynrelocs (h, inf); | |
1485 | } | |
1486 | ||
0a1b45a2 | 1487 | static bool |
e23eba97 NC |
1488 | riscv_elf_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) |
1489 | { | |
1490 | struct riscv_elf_link_hash_table *htab; | |
1491 | bfd *dynobj; | |
1492 | asection *s; | |
1493 | bfd *ibfd; | |
1494 | ||
1495 | htab = riscv_elf_hash_table (info); | |
1496 | BFD_ASSERT (htab != NULL); | |
1497 | dynobj = htab->elf.dynobj; | |
1498 | BFD_ASSERT (dynobj != NULL); | |
1499 | ||
1500 | if (elf_hash_table (info)->dynamic_sections_created) | |
1501 | { | |
1502 | /* Set the contents of the .interp section to the interpreter. */ | |
1503 | if (bfd_link_executable (info) && !info->nointerp) | |
1504 | { | |
1505 | s = bfd_get_linker_section (dynobj, ".interp"); | |
1506 | BFD_ASSERT (s != NULL); | |
1507 | s->size = strlen (ELFNN_DYNAMIC_INTERPRETER) + 1; | |
1508 | s->contents = (unsigned char *) ELFNN_DYNAMIC_INTERPRETER; | |
1509 | } | |
1510 | } | |
1511 | ||
1512 | /* Set up .got offsets for local syms, and space for local dynamic | |
1513 | relocs. */ | |
1514 | for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next) | |
1515 | { | |
1516 | bfd_signed_vma *local_got; | |
1517 | bfd_signed_vma *end_local_got; | |
1518 | char *local_tls_type; | |
1519 | bfd_size_type locsymcount; | |
1520 | Elf_Internal_Shdr *symtab_hdr; | |
1521 | asection *srel; | |
1522 | ||
1523 | if (! is_riscv_elf (ibfd)) | |
1524 | continue; | |
1525 | ||
1526 | for (s = ibfd->sections; s != NULL; s = s->next) | |
1527 | { | |
3bf083ed | 1528 | struct elf_dyn_relocs *p; |
e23eba97 NC |
1529 | |
1530 | for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next) | |
1531 | { | |
1532 | if (!bfd_is_abs_section (p->sec) | |
1533 | && bfd_is_abs_section (p->sec->output_section)) | |
1534 | { | |
1535 | /* Input section has been discarded, either because | |
1536 | it is a copy of a linkonce section or due to | |
1537 | linker script /DISCARD/, so we'll be discarding | |
1538 | the relocs too. */ | |
1539 | } | |
1540 | else if (p->count != 0) | |
1541 | { | |
1542 | srel = elf_section_data (p->sec)->sreloc; | |
1543 | srel->size += p->count * sizeof (ElfNN_External_Rela); | |
1544 | if ((p->sec->output_section->flags & SEC_READONLY) != 0) | |
1545 | info->flags |= DF_TEXTREL; | |
1546 | } | |
1547 | } | |
1548 | } | |
1549 | ||
1550 | local_got = elf_local_got_refcounts (ibfd); | |
1551 | if (!local_got) | |
1552 | continue; | |
1553 | ||
1554 | symtab_hdr = &elf_symtab_hdr (ibfd); | |
1555 | locsymcount = symtab_hdr->sh_info; | |
1556 | end_local_got = local_got + locsymcount; | |
1557 | local_tls_type = _bfd_riscv_elf_local_got_tls_type (ibfd); | |
1558 | s = htab->elf.sgot; | |
1559 | srel = htab->elf.srelgot; | |
1560 | for (; local_got < end_local_got; ++local_got, ++local_tls_type) | |
1561 | { | |
1562 | if (*local_got > 0) | |
1563 | { | |
1564 | *local_got = s->size; | |
1565 | s->size += RISCV_ELF_WORD_BYTES; | |
1566 | if (*local_tls_type & GOT_TLS_GD) | |
1567 | s->size += RISCV_ELF_WORD_BYTES; | |
1568 | if (bfd_link_pic (info) | |
1569 | || (*local_tls_type & (GOT_TLS_GD | GOT_TLS_IE))) | |
1570 | srel->size += sizeof (ElfNN_External_Rela); | |
1571 | } | |
1572 | else | |
1573 | *local_got = (bfd_vma) -1; | |
1574 | } | |
1575 | } | |
1576 | ||
02dd9d25 NC |
1577 | /* Allocate .plt and .got entries and space dynamic relocs for |
1578 | global symbols. */ | |
e23eba97 NC |
1579 | elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info); |
1580 | ||
02dd9d25 NC |
1581 | /* Allocate .plt and .got entries and space dynamic relocs for |
1582 | global ifunc symbols. */ | |
1583 | elf_link_hash_traverse (&htab->elf, allocate_ifunc_dynrelocs, info); | |
1584 | ||
1585 | /* Allocate .plt and .got entries and space dynamic relocs for | |
1586 | local ifunc symbols. */ | |
1587 | htab_traverse (htab->loc_hash_table, allocate_local_ifunc_dynrelocs, info); | |
1588 | ||
51a8a7c2 NC |
1589 | /* Used to resolve the dynamic relocs overwite problems when |
1590 | generating static executable. */ | |
1591 | if (htab->elf.irelplt) | |
1592 | htab->last_iplt_index = htab->elf.irelplt->reloc_count - 1; | |
1593 | ||
e23eba97 NC |
1594 | if (htab->elf.sgotplt) |
1595 | { | |
1596 | struct elf_link_hash_entry *got; | |
1597 | got = elf_link_hash_lookup (elf_hash_table (info), | |
1598 | "_GLOBAL_OFFSET_TABLE_", | |
0a1b45a2 | 1599 | false, false, false); |
e23eba97 NC |
1600 | |
1601 | /* Don't allocate .got.plt section if there are no GOT nor PLT | |
1602 | entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */ | |
1603 | if ((got == NULL | |
1604 | || !got->ref_regular_nonweak) | |
1605 | && (htab->elf.sgotplt->size == GOTPLT_HEADER_SIZE) | |
1606 | && (htab->elf.splt == NULL | |
1607 | || htab->elf.splt->size == 0) | |
1608 | && (htab->elf.sgot == NULL | |
1609 | || (htab->elf.sgot->size | |
1610 | == get_elf_backend_data (output_bfd)->got_header_size))) | |
1611 | htab->elf.sgotplt->size = 0; | |
1612 | } | |
1613 | ||
1614 | /* The check_relocs and adjust_dynamic_symbol entry points have | |
1615 | determined the sizes of the various dynamic sections. Allocate | |
1616 | memory for them. */ | |
1617 | for (s = dynobj->sections; s != NULL; s = s->next) | |
1618 | { | |
1619 | if ((s->flags & SEC_LINKER_CREATED) == 0) | |
1620 | continue; | |
1621 | ||
1622 | if (s == htab->elf.splt | |
1623 | || s == htab->elf.sgot | |
1624 | || s == htab->elf.sgotplt | |
02dd9d25 NC |
1625 | || s == htab->elf.iplt |
1626 | || s == htab->elf.igotplt | |
5474d94f | 1627 | || s == htab->elf.sdynbss |
3e1b4df8 JW |
1628 | || s == htab->elf.sdynrelro |
1629 | || s == htab->sdyntdata) | |
e23eba97 NC |
1630 | { |
1631 | /* Strip this section if we don't need it; see the | |
1632 | comment below. */ | |
1633 | } | |
3f3328b8 | 1634 | else if (startswith (s->name, ".rela")) |
e23eba97 NC |
1635 | { |
1636 | if (s->size != 0) | |
1637 | { | |
1638 | /* We use the reloc_count field as a counter if we need | |
1639 | to copy relocs into the output file. */ | |
1640 | s->reloc_count = 0; | |
1641 | } | |
1642 | } | |
1643 | else | |
1644 | { | |
1645 | /* It's not one of our sections. */ | |
1646 | continue; | |
1647 | } | |
1648 | ||
1649 | if (s->size == 0) | |
1650 | { | |
1651 | /* If we don't need this section, strip it from the | |
1652 | output file. This is mostly to handle .rela.bss and | |
1653 | .rela.plt. We must create both sections in | |
1654 | create_dynamic_sections, because they must be created | |
1655 | before the linker maps input sections to output | |
1656 | sections. The linker does that before | |
1657 | adjust_dynamic_symbol is called, and it is that | |
1658 | function which decides whether anything needs to go | |
1659 | into these sections. */ | |
1660 | s->flags |= SEC_EXCLUDE; | |
1661 | continue; | |
1662 | } | |
1663 | ||
1664 | if ((s->flags & SEC_HAS_CONTENTS) == 0) | |
1665 | continue; | |
1666 | ||
1667 | /* Allocate memory for the section contents. Zero the memory | |
1668 | for the benefit of .rela.plt, which has 4 unused entries | |
1669 | at the beginning, and we don't want garbage. */ | |
1670 | s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); | |
1671 | if (s->contents == NULL) | |
0a1b45a2 | 1672 | return false; |
e23eba97 NC |
1673 | } |
1674 | ||
8155b853 NC |
1675 | /* Add dynamic entries. */ |
1676 | if (elf_hash_table (info)->dynamic_sections_created) | |
1677 | { | |
1678 | if (!_bfd_elf_add_dynamic_tags (output_bfd, info, true)) | |
1679 | return false; | |
1680 | ||
1681 | if (htab->variant_cc | |
1682 | && !_bfd_elf_add_dynamic_entry (info, DT_RISCV_VARIANT_CC, 0)) | |
1683 | return false; | |
1684 | } | |
1685 | ||
1686 | return true; | |
e23eba97 NC |
1687 | } |
1688 | ||
1689 | #define TP_OFFSET 0 | |
1690 | #define DTP_OFFSET 0x800 | |
1691 | ||
1692 | /* Return the relocation value for a TLS dtp-relative reloc. */ | |
1693 | ||
1694 | static bfd_vma | |
1695 | dtpoff (struct bfd_link_info *info, bfd_vma address) | |
1696 | { | |
1697 | /* If tls_sec is NULL, we should have signalled an error already. */ | |
1698 | if (elf_hash_table (info)->tls_sec == NULL) | |
1699 | return 0; | |
1700 | return address - elf_hash_table (info)->tls_sec->vma - DTP_OFFSET; | |
1701 | } | |
1702 | ||
1703 | /* Return the relocation value for a static TLS tp-relative relocation. */ | |
1704 | ||
1705 | static bfd_vma | |
1706 | tpoff (struct bfd_link_info *info, bfd_vma address) | |
1707 | { | |
1708 | /* If tls_sec is NULL, we should have signalled an error already. */ | |
1709 | if (elf_hash_table (info)->tls_sec == NULL) | |
1710 | return 0; | |
1711 | return address - elf_hash_table (info)->tls_sec->vma - TP_OFFSET; | |
1712 | } | |
1713 | ||
1714 | /* Return the global pointer's value, or 0 if it is not in use. */ | |
1715 | ||
1716 | static bfd_vma | |
1717 | riscv_global_pointer_value (struct bfd_link_info *info) | |
1718 | { | |
1719 | struct bfd_link_hash_entry *h; | |
1720 | ||
0a1b45a2 | 1721 | h = bfd_link_hash_lookup (info->hash, RISCV_GP_SYMBOL, false, false, true); |
e23eba97 NC |
1722 | if (h == NULL || h->type != bfd_link_hash_defined) |
1723 | return 0; | |
1724 | ||
1725 | return h->u.def.value + sec_addr (h->u.def.section); | |
1726 | } | |
1727 | ||
1728 | /* Emplace a static relocation. */ | |
1729 | ||
1730 | static bfd_reloc_status_type | |
1731 | perform_relocation (const reloc_howto_type *howto, | |
1732 | const Elf_Internal_Rela *rel, | |
1733 | bfd_vma value, | |
1734 | asection *input_section, | |
1735 | bfd *input_bfd, | |
1736 | bfd_byte *contents) | |
1737 | { | |
1738 | if (howto->pc_relative) | |
1739 | value -= sec_addr (input_section) + rel->r_offset; | |
1740 | value += rel->r_addend; | |
1741 | ||
1742 | switch (ELFNN_R_TYPE (rel->r_info)) | |
1743 | { | |
1744 | case R_RISCV_HI20: | |
1745 | case R_RISCV_TPREL_HI20: | |
1746 | case R_RISCV_PCREL_HI20: | |
1747 | case R_RISCV_GOT_HI20: | |
1748 | case R_RISCV_TLS_GOT_HI20: | |
1749 | case R_RISCV_TLS_GD_HI20: | |
1750 | if (ARCH_SIZE > 32 && !VALID_UTYPE_IMM (RISCV_CONST_HIGH_PART (value))) | |
1751 | return bfd_reloc_overflow; | |
1752 | value = ENCODE_UTYPE_IMM (RISCV_CONST_HIGH_PART (value)); | |
1753 | break; | |
1754 | ||
1755 | case R_RISCV_LO12_I: | |
1756 | case R_RISCV_GPREL_I: | |
1757 | case R_RISCV_TPREL_LO12_I: | |
45f76423 | 1758 | case R_RISCV_TPREL_I: |
e23eba97 NC |
1759 | case R_RISCV_PCREL_LO12_I: |
1760 | value = ENCODE_ITYPE_IMM (value); | |
1761 | break; | |
1762 | ||
1763 | case R_RISCV_LO12_S: | |
1764 | case R_RISCV_GPREL_S: | |
1765 | case R_RISCV_TPREL_LO12_S: | |
45f76423 | 1766 | case R_RISCV_TPREL_S: |
e23eba97 NC |
1767 | case R_RISCV_PCREL_LO12_S: |
1768 | value = ENCODE_STYPE_IMM (value); | |
1769 | break; | |
1770 | ||
1771 | case R_RISCV_CALL: | |
1772 | case R_RISCV_CALL_PLT: | |
1773 | if (ARCH_SIZE > 32 && !VALID_UTYPE_IMM (RISCV_CONST_HIGH_PART (value))) | |
1774 | return bfd_reloc_overflow; | |
1775 | value = ENCODE_UTYPE_IMM (RISCV_CONST_HIGH_PART (value)) | |
1776 | | (ENCODE_ITYPE_IMM (value) << 32); | |
1777 | break; | |
1778 | ||
1779 | case R_RISCV_JAL: | |
5a9f5403 | 1780 | if (!VALID_JTYPE_IMM (value)) |
e23eba97 | 1781 | return bfd_reloc_overflow; |
5a9f5403 | 1782 | value = ENCODE_JTYPE_IMM (value); |
e23eba97 NC |
1783 | break; |
1784 | ||
1785 | case R_RISCV_BRANCH: | |
5a9f5403 | 1786 | if (!VALID_BTYPE_IMM (value)) |
e23eba97 | 1787 | return bfd_reloc_overflow; |
5a9f5403 | 1788 | value = ENCODE_BTYPE_IMM (value); |
e23eba97 NC |
1789 | break; |
1790 | ||
1791 | case R_RISCV_RVC_BRANCH: | |
5a9f5403 | 1792 | if (!VALID_CBTYPE_IMM (value)) |
e23eba97 | 1793 | return bfd_reloc_overflow; |
5a9f5403 | 1794 | value = ENCODE_CBTYPE_IMM (value); |
e23eba97 NC |
1795 | break; |
1796 | ||
1797 | case R_RISCV_RVC_JUMP: | |
5a9f5403 | 1798 | if (!VALID_CJTYPE_IMM (value)) |
e23eba97 | 1799 | return bfd_reloc_overflow; |
5a9f5403 | 1800 | value = ENCODE_CJTYPE_IMM (value); |
e23eba97 NC |
1801 | break; |
1802 | ||
1803 | case R_RISCV_RVC_LUI: | |
080a4883 JW |
1804 | if (RISCV_CONST_HIGH_PART (value) == 0) |
1805 | { | |
1806 | /* Linker relaxation can convert an address equal to or greater than | |
1807 | 0x800 to slightly below 0x800. C.LUI does not accept zero as a | |
1808 | valid immediate. We can fix this by converting it to a C.LI. */ | |
fbc09e7a MC |
1809 | bfd_vma insn = riscv_get_insn (howto->bitsize, |
1810 | contents + rel->r_offset); | |
080a4883 | 1811 | insn = (insn & ~MATCH_C_LUI) | MATCH_C_LI; |
fbc09e7a | 1812 | riscv_put_insn (howto->bitsize, insn, contents + rel->r_offset); |
5a9f5403 | 1813 | value = ENCODE_CITYPE_IMM (0); |
080a4883 | 1814 | } |
5a9f5403 | 1815 | else if (!VALID_CITYPE_LUI_IMM (RISCV_CONST_HIGH_PART (value))) |
e23eba97 | 1816 | return bfd_reloc_overflow; |
080a4883 | 1817 | else |
5a9f5403 | 1818 | value = ENCODE_CITYPE_LUI_IMM (RISCV_CONST_HIGH_PART (value)); |
e23eba97 NC |
1819 | break; |
1820 | ||
f1cd8b94 KLC |
1821 | /* SUB_ULEB128 must be applied after SET_ULEB128, so we only write the |
1822 | value back for SUB_ULEB128 should be enough. */ | |
1823 | case R_RISCV_SET_ULEB128: | |
1824 | break; | |
1825 | case R_RISCV_SUB_ULEB128: | |
1826 | { | |
1827 | unsigned int len = 0; | |
1828 | _bfd_read_unsigned_leb128 (input_bfd, contents + rel->r_offset, &len); | |
1829 | ||
1830 | /* Clean the contents value to zero (0x80), but keep the original | |
1831 | length. */ | |
1832 | bfd_byte *p = contents + rel->r_offset; | |
1833 | bfd_byte *endp = p + len - 1; | |
1834 | memset (p, 0x80, len - 1); | |
1835 | *(endp) = 0; | |
1836 | ||
1837 | /* Make sure the length of the new uleb128 value within the | |
1838 | original (available) length. */ | |
1839 | unsigned int new_len = 0; | |
1840 | unsigned int val_t = value; | |
1841 | do | |
1842 | { | |
1843 | new_len++; | |
1844 | val_t >>= 7; | |
1845 | } | |
1846 | while (val_t); | |
1847 | if (new_len > len) | |
1848 | { | |
1849 | _bfd_error_handler | |
1850 | (_("final size of uleb128 value at offset 0x%lx in %pA from " | |
1851 | "%pB exceeds available space"), | |
1852 | (long) rel->r_offset, input_section, input_bfd); | |
1853 | return bfd_reloc_dangerous; | |
1854 | } | |
1855 | else | |
1856 | { | |
1857 | p = _bfd_write_unsigned_leb128 (p, endp, value); | |
1858 | BFD_ASSERT (p); | |
1859 | ||
1860 | /* If the length of the value is reduced and shorter than the | |
1861 | original uleb128 length, then _bfd_write_unsigned_leb128 may | |
1862 | clear the 0x80 to 0x0 for the last byte that was written. | |
1863 | So reset it to keep the the original uleb128 length. */ | |
1864 | if (--p < endp) | |
1865 | *p |= 0x80; | |
1866 | } | |
1867 | return bfd_reloc_ok; | |
1868 | } | |
1869 | ||
e23eba97 NC |
1870 | case R_RISCV_32: |
1871 | case R_RISCV_64: | |
1872 | case R_RISCV_ADD8: | |
1873 | case R_RISCV_ADD16: | |
1874 | case R_RISCV_ADD32: | |
1875 | case R_RISCV_ADD64: | |
45f76423 | 1876 | case R_RISCV_SUB6: |
e23eba97 NC |
1877 | case R_RISCV_SUB8: |
1878 | case R_RISCV_SUB16: | |
1879 | case R_RISCV_SUB32: | |
1880 | case R_RISCV_SUB64: | |
45f76423 AW |
1881 | case R_RISCV_SET6: |
1882 | case R_RISCV_SET8: | |
1883 | case R_RISCV_SET16: | |
1884 | case R_RISCV_SET32: | |
a6cbf936 | 1885 | case R_RISCV_32_PCREL: |
e23eba97 NC |
1886 | case R_RISCV_TLS_DTPREL32: |
1887 | case R_RISCV_TLS_DTPREL64: | |
1888 | break; | |
1889 | ||
ff6f4d9b PD |
1890 | case R_RISCV_DELETE: |
1891 | return bfd_reloc_ok; | |
1892 | ||
e23eba97 NC |
1893 | default: |
1894 | return bfd_reloc_notsupported; | |
1895 | } | |
1896 | ||
fbc09e7a MC |
1897 | bfd_vma word; |
1898 | if (riscv_is_insn_reloc (howto)) | |
1899 | word = riscv_get_insn (howto->bitsize, contents + rel->r_offset); | |
1900 | else | |
1901 | word = bfd_get (howto->bitsize, input_bfd, contents + rel->r_offset); | |
e23eba97 | 1902 | word = (word & ~howto->dst_mask) | (value & howto->dst_mask); |
fbc09e7a MC |
1903 | if (riscv_is_insn_reloc (howto)) |
1904 | riscv_put_insn (howto->bitsize, word, contents + rel->r_offset); | |
1905 | else | |
1906 | bfd_put (howto->bitsize, input_bfd, word, contents + rel->r_offset); | |
e23eba97 NC |
1907 | |
1908 | return bfd_reloc_ok; | |
1909 | } | |
1910 | ||
1911 | /* Remember all PC-relative high-part relocs we've encountered to help us | |
1912 | later resolve the corresponding low-part relocs. */ | |
1913 | ||
1914 | typedef struct | |
1915 | { | |
50331d64 | 1916 | /* PC value. */ |
e23eba97 | 1917 | bfd_vma address; |
50331d64 | 1918 | /* Relocation value with addend. */ |
e23eba97 | 1919 | bfd_vma value; |
50331d64 NC |
1920 | /* Original reloc type. */ |
1921 | int type; | |
e23eba97 NC |
1922 | } riscv_pcrel_hi_reloc; |
1923 | ||
1924 | typedef struct riscv_pcrel_lo_reloc | |
1925 | { | |
50331d64 NC |
1926 | /* PC value of auipc. */ |
1927 | bfd_vma address; | |
1928 | /* Internal relocation. */ | |
1929 | const Elf_Internal_Rela *reloc; | |
1930 | /* Record the following information helps to resolve the %pcrel | |
1931 | which cross different input section. For now we build a hash | |
1932 | for pcrel at the start of riscv_elf_relocate_section, and then | |
1933 | free the hash at the end. But riscv_elf_relocate_section only | |
1934 | handles an input section at a time, so that means we can only | |
1935 | resolve the %pcrel_hi and %pcrel_lo which are in the same input | |
1936 | section. Otherwise, we will report dangerous relocation errors | |
1937 | for those %pcrel which are not in the same input section. */ | |
1942a048 NC |
1938 | asection *input_section; |
1939 | struct bfd_link_info *info; | |
1940 | reloc_howto_type *howto; | |
1942a048 | 1941 | bfd_byte *contents; |
50331d64 | 1942 | /* The next riscv_pcrel_lo_reloc. */ |
1942a048 | 1943 | struct riscv_pcrel_lo_reloc *next; |
e23eba97 NC |
1944 | } riscv_pcrel_lo_reloc; |
1945 | ||
1946 | typedef struct | |
1947 | { | |
50331d64 | 1948 | /* Hash table for riscv_pcrel_hi_reloc. */ |
e23eba97 | 1949 | htab_t hi_relocs; |
50331d64 | 1950 | /* Linked list for riscv_pcrel_lo_reloc. */ |
e23eba97 NC |
1951 | riscv_pcrel_lo_reloc *lo_relocs; |
1952 | } riscv_pcrel_relocs; | |
1953 | ||
1954 | static hashval_t | |
1955 | riscv_pcrel_reloc_hash (const void *entry) | |
1956 | { | |
1957 | const riscv_pcrel_hi_reloc *e = entry; | |
1958 | return (hashval_t)(e->address >> 2); | |
1959 | } | |
1960 | ||
1201fda6 | 1961 | static int |
e23eba97 NC |
1962 | riscv_pcrel_reloc_eq (const void *entry1, const void *entry2) |
1963 | { | |
1964 | const riscv_pcrel_hi_reloc *e1 = entry1, *e2 = entry2; | |
1965 | return e1->address == e2->address; | |
1966 | } | |
1967 | ||
0a1b45a2 | 1968 | static bool |
e23eba97 NC |
1969 | riscv_init_pcrel_relocs (riscv_pcrel_relocs *p) |
1970 | { | |
e23eba97 NC |
1971 | p->lo_relocs = NULL; |
1972 | p->hi_relocs = htab_create (1024, riscv_pcrel_reloc_hash, | |
1973 | riscv_pcrel_reloc_eq, free); | |
1974 | return p->hi_relocs != NULL; | |
1975 | } | |
1976 | ||
1977 | static void | |
1978 | riscv_free_pcrel_relocs (riscv_pcrel_relocs *p) | |
1979 | { | |
1980 | riscv_pcrel_lo_reloc *cur = p->lo_relocs; | |
1981 | ||
1982 | while (cur != NULL) | |
1983 | { | |
1984 | riscv_pcrel_lo_reloc *next = cur->next; | |
1985 | free (cur); | |
1986 | cur = next; | |
1987 | } | |
1988 | ||
1989 | htab_delete (p->hi_relocs); | |
1990 | } | |
1991 | ||
0a1b45a2 | 1992 | static bool |
b1308d2c PD |
1993 | riscv_zero_pcrel_hi_reloc (Elf_Internal_Rela *rel, |
1994 | struct bfd_link_info *info, | |
1995 | bfd_vma pc, | |
1996 | bfd_vma addr, | |
1997 | bfd_byte *contents, | |
50331d64 | 1998 | const reloc_howto_type *howto) |
e23eba97 | 1999 | { |
b1308d2c | 2000 | /* We may need to reference low addreses in PC-relative modes even when the |
dcd709e0 NC |
2001 | PC is far away from these addresses. For example, undefweak references |
2002 | need to produce the address 0 when linked. As 0 is far from the arbitrary | |
2003 | addresses that we can link PC-relative programs at, the linker can't | |
2004 | actually relocate references to those symbols. In order to allow these | |
2005 | programs to work we simply convert the PC-relative auipc sequences to | |
2006 | 0-relative lui sequences. */ | |
b1308d2c | 2007 | if (bfd_link_pic (info)) |
0a1b45a2 | 2008 | return false; |
b1308d2c PD |
2009 | |
2010 | /* If it's possible to reference the symbol using auipc we do so, as that's | |
dcd709e0 | 2011 | more in the spirit of the PC-relative relocations we're processing. */ |
b1308d2c PD |
2012 | bfd_vma offset = addr - pc; |
2013 | if (ARCH_SIZE == 32 || VALID_UTYPE_IMM (RISCV_CONST_HIGH_PART (offset))) | |
0a1b45a2 | 2014 | return false; |
b1308d2c PD |
2015 | |
2016 | /* If it's impossible to reference this with a LUI-based offset then don't | |
dcd709e0 NC |
2017 | bother to convert it at all so users still see the PC-relative relocation |
2018 | in the truncation message. */ | |
b1308d2c | 2019 | if (ARCH_SIZE > 32 && !VALID_UTYPE_IMM (RISCV_CONST_HIGH_PART (addr))) |
0a1b45a2 | 2020 | return false; |
b1308d2c | 2021 | |
1942a048 | 2022 | rel->r_info = ELFNN_R_INFO (addr, R_RISCV_HI20); |
b1308d2c | 2023 | |
1942a048 | 2024 | bfd_vma insn = riscv_get_insn (howto->bitsize, contents + rel->r_offset); |
b1308d2c | 2025 | insn = (insn & ~MASK_AUIPC) | MATCH_LUI; |
1942a048 | 2026 | riscv_put_insn (howto->bitsize, insn, contents + rel->r_offset); |
0a1b45a2 | 2027 | return true; |
b1308d2c PD |
2028 | } |
2029 | ||
0a1b45a2 | 2030 | static bool |
50331d64 NC |
2031 | riscv_record_pcrel_hi_reloc (riscv_pcrel_relocs *p, |
2032 | bfd_vma addr, | |
2033 | bfd_vma value, | |
2034 | int type, | |
2035 | bool absolute) | |
b1308d2c PD |
2036 | { |
2037 | bfd_vma offset = absolute ? value : value - addr; | |
50331d64 | 2038 | riscv_pcrel_hi_reloc entry = {addr, offset, type}; |
e23eba97 NC |
2039 | riscv_pcrel_hi_reloc **slot = |
2040 | (riscv_pcrel_hi_reloc **) htab_find_slot (p->hi_relocs, &entry, INSERT); | |
2041 | ||
2042 | BFD_ASSERT (*slot == NULL); | |
2043 | *slot = (riscv_pcrel_hi_reloc *) bfd_malloc (sizeof (riscv_pcrel_hi_reloc)); | |
2044 | if (*slot == NULL) | |
0a1b45a2 | 2045 | return false; |
e23eba97 | 2046 | **slot = entry; |
0a1b45a2 | 2047 | return true; |
e23eba97 NC |
2048 | } |
2049 | ||
0a1b45a2 | 2050 | static bool |
e23eba97 | 2051 | riscv_record_pcrel_lo_reloc (riscv_pcrel_relocs *p, |
50331d64 NC |
2052 | bfd_vma addr, |
2053 | const Elf_Internal_Rela *reloc, | |
e23eba97 NC |
2054 | asection *input_section, |
2055 | struct bfd_link_info *info, | |
2056 | reloc_howto_type *howto, | |
e23eba97 NC |
2057 | bfd_byte *contents) |
2058 | { | |
2059 | riscv_pcrel_lo_reloc *entry; | |
2060 | entry = (riscv_pcrel_lo_reloc *) bfd_malloc (sizeof (riscv_pcrel_lo_reloc)); | |
2061 | if (entry == NULL) | |
0a1b45a2 | 2062 | return false; |
50331d64 NC |
2063 | *entry = (riscv_pcrel_lo_reloc) {addr, reloc, input_section, info, |
2064 | howto, contents, p->lo_relocs}; | |
e23eba97 | 2065 | p->lo_relocs = entry; |
0a1b45a2 | 2066 | return true; |
e23eba97 NC |
2067 | } |
2068 | ||
0a1b45a2 | 2069 | static bool |
e23eba97 NC |
2070 | riscv_resolve_pcrel_lo_relocs (riscv_pcrel_relocs *p) |
2071 | { | |
2072 | riscv_pcrel_lo_reloc *r; | |
2073 | ||
2074 | for (r = p->lo_relocs; r != NULL; r = r->next) | |
2075 | { | |
2076 | bfd *input_bfd = r->input_section->owner; | |
2077 | ||
50331d64 | 2078 | riscv_pcrel_hi_reloc search = {r->address, 0, 0}; |
e23eba97 | 2079 | riscv_pcrel_hi_reloc *entry = htab_find (p->hi_relocs, &search); |
50331d64 NC |
2080 | /* There may be a risk if the %pcrel_lo with addend refers to |
2081 | an IFUNC symbol. The %pcrel_hi has been relocated to plt, | |
2082 | so the corresponding %pcrel_lo with addend looks wrong. */ | |
2083 | char *string = NULL; | |
2084 | if (entry == NULL) | |
2085 | string = _("%pcrel_lo missing matching %pcrel_hi"); | |
2086 | else if (entry->type == R_RISCV_GOT_HI20 | |
2087 | && r->reloc->r_addend != 0) | |
2088 | string = _("%pcrel_lo with addend isn't allowed for R_RISCV_GOT_HI20"); | |
2089 | else if (RISCV_CONST_HIGH_PART (entry->value) | |
2090 | != RISCV_CONST_HIGH_PART (entry->value + r->reloc->r_addend)) | |
07d6d2b8 | 2091 | { |
50331d64 | 2092 | /* Check the overflow when adding reloc addend. */ |
6f860418 AM |
2093 | string = bfd_asprintf (_("%%pcrel_lo overflow with an addend," |
2094 | " the value of %%pcrel_hi is 0x%" PRIx64 | |
2095 | " without any addend, but may be 0x%" PRIx64 | |
2096 | " after adding the %%pcrel_lo addend"), | |
2097 | (int64_t) RISCV_CONST_HIGH_PART (entry->value), | |
2098 | (int64_t) RISCV_CONST_HIGH_PART | |
2099 | (entry->value + r->reloc->r_addend)); | |
2100 | if (string == NULL) | |
75f03fa7 | 2101 | string = _("%pcrel_lo overflow with an addend"); |
50331d64 | 2102 | } |
75f03fa7 | 2103 | |
50331d64 NC |
2104 | if (string != NULL) |
2105 | { | |
551703cf JW |
2106 | (*r->info->callbacks->reloc_dangerous) |
2107 | (r->info, string, input_bfd, r->input_section, r->reloc->r_offset); | |
0a1b45a2 | 2108 | return true; |
07d6d2b8 | 2109 | } |
e23eba97 NC |
2110 | |
2111 | perform_relocation (r->howto, r->reloc, entry->value, r->input_section, | |
2112 | input_bfd, r->contents); | |
2113 | } | |
2114 | ||
0a1b45a2 | 2115 | return true; |
e23eba97 NC |
2116 | } |
2117 | ||
2118 | /* Relocate a RISC-V ELF section. | |
2119 | ||
2120 | The RELOCATE_SECTION function is called by the new ELF backend linker | |
2121 | to handle the relocations for a section. | |
2122 | ||
2123 | The relocs are always passed as Rela structures. | |
2124 | ||
2125 | This function is responsible for adjusting the section contents as | |
2126 | necessary, and (if generating a relocatable output file) adjusting | |
2127 | the reloc addend as necessary. | |
2128 | ||
2129 | This function does not have to worry about setting the reloc | |
2130 | address or the reloc symbol index. | |
2131 | ||
2132 | LOCAL_SYMS is a pointer to the swapped in local symbols. | |
2133 | ||
2134 | LOCAL_SECTIONS is an array giving the section in the input file | |
2135 | corresponding to the st_shndx field of each local symbol. | |
2136 | ||
2137 | The global hash table entry for the global symbols can be found | |
2138 | via elf_sym_hashes (input_bfd). | |
2139 | ||
2140 | When generating relocatable output, this function must handle | |
2141 | STB_LOCAL/STT_SECTION symbols specially. The output symbol is | |
2142 | going to be the section symbol corresponding to the output | |
2143 | section, which means that the addend must be adjusted | |
2144 | accordingly. */ | |
2145 | ||
0f684201 | 2146 | static int |
e23eba97 NC |
2147 | riscv_elf_relocate_section (bfd *output_bfd, |
2148 | struct bfd_link_info *info, | |
2149 | bfd *input_bfd, | |
2150 | asection *input_section, | |
2151 | bfd_byte *contents, | |
2152 | Elf_Internal_Rela *relocs, | |
2153 | Elf_Internal_Sym *local_syms, | |
2154 | asection **local_sections) | |
2155 | { | |
2156 | Elf_Internal_Rela *rel; | |
2157 | Elf_Internal_Rela *relend; | |
2158 | riscv_pcrel_relocs pcrel_relocs; | |
0a1b45a2 | 2159 | bool ret = false; |
e23eba97 NC |
2160 | struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info); |
2161 | Elf_Internal_Shdr *symtab_hdr = &elf_symtab_hdr (input_bfd); | |
2162 | struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (input_bfd); | |
2163 | bfd_vma *local_got_offsets = elf_local_got_offsets (input_bfd); | |
f1cd8b94 KLC |
2164 | bfd_vma uleb128_set_vma = 0; |
2165 | Elf_Internal_Rela *uleb128_set_rel = NULL; | |
0a1b45a2 | 2166 | bool absolute; |
e23eba97 NC |
2167 | |
2168 | if (!riscv_init_pcrel_relocs (&pcrel_relocs)) | |
0a1b45a2 | 2169 | return false; |
e23eba97 NC |
2170 | |
2171 | relend = relocs + input_section->reloc_count; | |
2172 | for (rel = relocs; rel < relend; rel++) | |
2173 | { | |
2174 | unsigned long r_symndx; | |
2175 | struct elf_link_hash_entry *h; | |
2176 | Elf_Internal_Sym *sym; | |
2177 | asection *sec; | |
2178 | bfd_vma relocation; | |
2179 | bfd_reloc_status_type r = bfd_reloc_ok; | |
02dd9d25 | 2180 | const char *name = NULL; |
e23eba97 | 2181 | bfd_vma off, ie_off; |
0a1b45a2 | 2182 | bool unresolved_reloc, is_ie = false; |
e23eba97 NC |
2183 | bfd_vma pc = sec_addr (input_section) + rel->r_offset; |
2184 | int r_type = ELFNN_R_TYPE (rel->r_info), tls_type; | |
0aa13fee | 2185 | reloc_howto_type *howto = riscv_elf_rtype_to_howto (input_bfd, r_type); |
e23eba97 | 2186 | const char *msg = NULL; |
0a1b45a2 | 2187 | bool resolved_to_zero; |
e23eba97 | 2188 | |
45359528 | 2189 | if (howto == NULL) |
e23eba97 NC |
2190 | continue; |
2191 | ||
2192 | /* This is a final link. */ | |
2193 | r_symndx = ELFNN_R_SYM (rel->r_info); | |
2194 | h = NULL; | |
2195 | sym = NULL; | |
2196 | sec = NULL; | |
0a1b45a2 | 2197 | unresolved_reloc = false; |
e23eba97 NC |
2198 | if (r_symndx < symtab_hdr->sh_info) |
2199 | { | |
2200 | sym = local_syms + r_symndx; | |
2201 | sec = local_sections[r_symndx]; | |
2202 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); | |
02dd9d25 NC |
2203 | |
2204 | /* Relocate against local STT_GNU_IFUNC symbol. */ | |
2205 | if (!bfd_link_relocatable (info) | |
2206 | && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC) | |
2207 | { | |
0a1b45a2 | 2208 | h = riscv_elf_get_local_sym_hash (htab, input_bfd, rel, false); |
02dd9d25 NC |
2209 | if (h == NULL) |
2210 | abort (); | |
2211 | ||
2212 | /* Set STT_GNU_IFUNC symbol value. */ | |
2213 | h->root.u.def.value = sym->st_value; | |
2214 | h->root.u.def.section = sec; | |
2215 | } | |
e23eba97 NC |
2216 | } |
2217 | else | |
2218 | { | |
0a1b45a2 | 2219 | bool warned, ignored; |
e23eba97 NC |
2220 | |
2221 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, | |
2222 | r_symndx, symtab_hdr, sym_hashes, | |
2223 | h, sec, relocation, | |
2224 | unresolved_reloc, warned, ignored); | |
2225 | if (warned) | |
2226 | { | |
2227 | /* To avoid generating warning messages about truncated | |
2228 | relocations, set the relocation's address to be the same as | |
2229 | the start of this section. */ | |
2230 | if (input_section->output_section != NULL) | |
2231 | relocation = input_section->output_section->vma; | |
2232 | else | |
2233 | relocation = 0; | |
2234 | } | |
2235 | } | |
2236 | ||
2237 | if (sec != NULL && discarded_section (sec)) | |
2238 | RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, | |
2239 | rel, 1, relend, howto, 0, contents); | |
2240 | ||
2241 | if (bfd_link_relocatable (info)) | |
2242 | continue; | |
2243 | ||
02dd9d25 NC |
2244 | /* Since STT_GNU_IFUNC symbol must go through PLT, we handle |
2245 | it here if it is defined in a non-shared object. */ | |
2246 | if (h != NULL | |
2247 | && h->type == STT_GNU_IFUNC | |
2248 | && h->def_regular) | |
2249 | { | |
2250 | asection *plt, *base_got; | |
2251 | ||
2252 | if ((input_section->flags & SEC_ALLOC) == 0) | |
2253 | { | |
2254 | /* If this is a SHT_NOTE section without SHF_ALLOC, treat | |
2255 | STT_GNU_IFUNC symbol as STT_FUNC. */ | |
2256 | if (elf_section_type (input_section) == SHT_NOTE) | |
2257 | goto skip_ifunc; | |
2258 | ||
2259 | /* Dynamic relocs are not propagated for SEC_DEBUGGING | |
2260 | sections because such sections are not SEC_ALLOC and | |
2261 | thus ld.so will not process them. */ | |
2262 | if ((input_section->flags & SEC_DEBUGGING) != 0) | |
2263 | continue; | |
2264 | ||
2265 | abort (); | |
2266 | } | |
2267 | else if (h->plt.offset == (bfd_vma) -1 | |
2268 | /* The following relocation may not need the .plt entries | |
2269 | when all references to a STT_GNU_IFUNC symbols are done | |
2270 | via GOT or static function pointers. */ | |
2271 | && r_type != R_RISCV_32 | |
2272 | && r_type != R_RISCV_64 | |
2273 | && r_type != R_RISCV_HI20 | |
2274 | && r_type != R_RISCV_GOT_HI20 | |
2275 | && r_type != R_RISCV_LO12_I | |
2276 | && r_type != R_RISCV_LO12_S) | |
2277 | goto bad_ifunc_reloc; | |
2278 | ||
2279 | /* STT_GNU_IFUNC symbol must go through PLT. */ | |
2280 | plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt; | |
2281 | relocation = plt->output_section->vma | |
2282 | + plt->output_offset | |
2283 | + h->plt.offset; | |
2284 | ||
2285 | switch (r_type) | |
2286 | { | |
2287 | case R_RISCV_32: | |
2288 | case R_RISCV_64: | |
2289 | if (rel->r_addend != 0) | |
2290 | { | |
2291 | if (h->root.root.string) | |
2292 | name = h->root.root.string; | |
2293 | else | |
2294 | name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym, NULL); | |
2295 | ||
2296 | _bfd_error_handler | |
2297 | /* xgettext:c-format */ | |
2298 | (_("%pB: relocation %s against STT_GNU_IFUNC " | |
2299 | "symbol `%s' has non-zero addend: %" PRId64), | |
2300 | input_bfd, howto->name, name, (int64_t) rel->r_addend); | |
2301 | bfd_set_error (bfd_error_bad_value); | |
0a1b45a2 | 2302 | return false; |
02dd9d25 NC |
2303 | } |
2304 | ||
2305 | /* Generate dynamic relocation only when there is a non-GOT | |
2306 | reference in a shared object or there is no PLT. */ | |
2307 | if ((bfd_link_pic (info) && h->non_got_ref) | |
2308 | || h->plt.offset == (bfd_vma) -1) | |
2309 | { | |
2310 | Elf_Internal_Rela outrel; | |
2311 | asection *sreloc; | |
2312 | ||
2313 | /* Need a dynamic relocation to get the real function | |
2314 | address. */ | |
2315 | outrel.r_offset = _bfd_elf_section_offset (output_bfd, | |
2316 | info, | |
2317 | input_section, | |
2318 | rel->r_offset); | |
2319 | if (outrel.r_offset == (bfd_vma) -1 | |
2320 | || outrel.r_offset == (bfd_vma) -2) | |
2321 | abort (); | |
2322 | ||
2323 | outrel.r_offset += input_section->output_section->vma | |
2324 | + input_section->output_offset; | |
2325 | ||
2326 | if (h->dynindx == -1 | |
2327 | || h->forced_local | |
2328 | || bfd_link_executable (info)) | |
2329 | { | |
2330 | info->callbacks->minfo | |
2331 | (_("Local IFUNC function `%s' in %pB\n"), | |
2332 | h->root.root.string, | |
2333 | h->root.u.def.section->owner); | |
2334 | ||
2335 | /* This symbol is resolved locally. */ | |
2336 | outrel.r_info = ELFNN_R_INFO (0, R_RISCV_IRELATIVE); | |
2337 | outrel.r_addend = h->root.u.def.value | |
2338 | + h->root.u.def.section->output_section->vma | |
2339 | + h->root.u.def.section->output_offset; | |
2340 | } | |
2341 | else | |
2342 | { | |
2343 | outrel.r_info = ELFNN_R_INFO (h->dynindx, r_type); | |
2344 | outrel.r_addend = 0; | |
2345 | } | |
2346 | ||
2347 | /* Dynamic relocations are stored in | |
2348 | 1. .rela.ifunc section in PIC object. | |
2349 | 2. .rela.got section in dynamic executable. | |
2350 | 3. .rela.iplt section in static executable. */ | |
2351 | if (bfd_link_pic (info)) | |
2352 | sreloc = htab->elf.irelifunc; | |
2353 | else if (htab->elf.splt != NULL) | |
2354 | sreloc = htab->elf.srelgot; | |
2355 | else | |
2356 | sreloc = htab->elf.irelplt; | |
2357 | ||
2358 | riscv_elf_append_rela (output_bfd, sreloc, &outrel); | |
2359 | ||
2360 | /* If this reloc is against an external symbol, we | |
2361 | do not want to fiddle with the addend. Otherwise, | |
2362 | we need to include the symbol value so that it | |
2363 | becomes an addend for the dynamic reloc. For an | |
2364 | internal symbol, we have updated addend. */ | |
2365 | continue; | |
2366 | } | |
2367 | goto do_relocation; | |
2368 | ||
2369 | case R_RISCV_GOT_HI20: | |
2370 | base_got = htab->elf.sgot; | |
2371 | off = h->got.offset; | |
2372 | ||
2373 | if (base_got == NULL) | |
2374 | abort (); | |
2375 | ||
2376 | if (off == (bfd_vma) -1) | |
2377 | { | |
2378 | bfd_vma plt_idx; | |
2379 | ||
2380 | /* We can't use h->got.offset here to save state, or | |
2381 | even just remember the offset, as finish_dynamic_symbol | |
2382 | would use that as offset into .got. */ | |
2383 | ||
2384 | if (htab->elf.splt != NULL) | |
2385 | { | |
2386 | plt_idx = (h->plt.offset - PLT_HEADER_SIZE) | |
2387 | / PLT_ENTRY_SIZE; | |
2388 | off = GOTPLT_HEADER_SIZE + (plt_idx * GOT_ENTRY_SIZE); | |
2389 | base_got = htab->elf.sgotplt; | |
2390 | } | |
2391 | else | |
2392 | { | |
2393 | plt_idx = h->plt.offset / PLT_ENTRY_SIZE; | |
2394 | off = plt_idx * GOT_ENTRY_SIZE; | |
2395 | base_got = htab->elf.igotplt; | |
2396 | } | |
2397 | ||
2398 | if (h->dynindx == -1 | |
2399 | || h->forced_local | |
2400 | || info->symbolic) | |
2401 | { | |
2402 | /* This references the local definition. We must | |
2403 | initialize this entry in the global offset table. | |
2404 | Since the offset must always be a multiple of 8, | |
2405 | we use the least significant bit to record | |
2406 | whether we have initialized it already. | |
2407 | ||
2408 | When doing a dynamic link, we create a .rela.got | |
2409 | relocation entry to initialize the value. This | |
2410 | is done in the finish_dynamic_symbol routine. */ | |
2411 | if ((off & 1) != 0) | |
2412 | off &= ~1; | |
2413 | else | |
2414 | { | |
2415 | bfd_put_NN (output_bfd, relocation, | |
2416 | base_got->contents + off); | |
2417 | /* Note that this is harmless for the case, | |
2418 | as -1 | 1 still is -1. */ | |
2419 | h->got.offset |= 1; | |
2420 | } | |
2421 | } | |
2422 | } | |
2423 | ||
2424 | relocation = base_got->output_section->vma | |
2425 | + base_got->output_offset + off; | |
2426 | ||
50331d64 NC |
2427 | if (!riscv_record_pcrel_hi_reloc (&pcrel_relocs, pc, |
2428 | relocation, r_type, | |
2429 | false)) | |
02dd9d25 NC |
2430 | r = bfd_reloc_overflow; |
2431 | goto do_relocation; | |
2432 | ||
2433 | case R_RISCV_CALL: | |
2434 | case R_RISCV_CALL_PLT: | |
2435 | case R_RISCV_HI20: | |
2436 | case R_RISCV_LO12_I: | |
2437 | case R_RISCV_LO12_S: | |
2438 | goto do_relocation; | |
2439 | ||
2440 | case R_RISCV_PCREL_HI20: | |
50331d64 NC |
2441 | if (!riscv_record_pcrel_hi_reloc (&pcrel_relocs, pc, |
2442 | relocation, r_type, | |
2443 | false)) | |
02dd9d25 NC |
2444 | r = bfd_reloc_overflow; |
2445 | goto do_relocation; | |
2446 | ||
2447 | default: | |
1942a048 | 2448 | bad_ifunc_reloc: |
02dd9d25 NC |
2449 | if (h->root.root.string) |
2450 | name = h->root.root.string; | |
2451 | else | |
2452 | /* The entry of local ifunc is fake in global hash table, | |
2453 | we should find the name by the original local symbol. */ | |
2454 | name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym, NULL); | |
2455 | ||
2456 | _bfd_error_handler | |
2457 | /* xgettext:c-format */ | |
2458 | (_("%pB: relocation %s against STT_GNU_IFUNC " | |
2459 | "symbol `%s' isn't supported"), input_bfd, | |
2460 | howto->name, name); | |
2461 | bfd_set_error (bfd_error_bad_value); | |
0a1b45a2 | 2462 | return false; |
02dd9d25 NC |
2463 | } |
2464 | } | |
2465 | ||
1942a048 | 2466 | skip_ifunc: |
e23eba97 NC |
2467 | if (h != NULL) |
2468 | name = h->root.root.string; | |
2469 | else | |
2470 | { | |
2471 | name = (bfd_elf_string_from_elf_section | |
2472 | (input_bfd, symtab_hdr->sh_link, sym->st_name)); | |
2473 | if (name == NULL || *name == '\0') | |
fd361982 | 2474 | name = bfd_section_name (sec); |
e23eba97 NC |
2475 | } |
2476 | ||
6487709f JW |
2477 | resolved_to_zero = (h != NULL |
2478 | && UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)); | |
2479 | ||
e23eba97 NC |
2480 | switch (r_type) |
2481 | { | |
2482 | case R_RISCV_NONE: | |
45f76423 | 2483 | case R_RISCV_RELAX: |
e23eba97 NC |
2484 | case R_RISCV_TPREL_ADD: |
2485 | case R_RISCV_COPY: | |
2486 | case R_RISCV_JUMP_SLOT: | |
2487 | case R_RISCV_RELATIVE: | |
2488 | /* These require nothing of us at all. */ | |
2489 | continue; | |
2490 | ||
2491 | case R_RISCV_HI20: | |
2492 | case R_RISCV_BRANCH: | |
2493 | case R_RISCV_RVC_BRANCH: | |
2494 | case R_RISCV_RVC_LUI: | |
2495 | case R_RISCV_LO12_I: | |
2496 | case R_RISCV_LO12_S: | |
45f76423 AW |
2497 | case R_RISCV_SET6: |
2498 | case R_RISCV_SET8: | |
2499 | case R_RISCV_SET16: | |
2500 | case R_RISCV_SET32: | |
a6cbf936 | 2501 | case R_RISCV_32_PCREL: |
ff6f4d9b | 2502 | case R_RISCV_DELETE: |
e23eba97 NC |
2503 | /* These require no special handling beyond perform_relocation. */ |
2504 | break; | |
2505 | ||
f1cd8b94 KLC |
2506 | case R_RISCV_SET_ULEB128: |
2507 | if (uleb128_set_rel == NULL) | |
2508 | { | |
2509 | /* Saved for later usage. */ | |
2510 | uleb128_set_vma = relocation; | |
2511 | uleb128_set_rel = rel; | |
2512 | continue; | |
2513 | } | |
2514 | else | |
2515 | { | |
2516 | msg = ("Mismatched R_RISCV_SET_ULEB128, it must be paired with" | |
2517 | "and applied before R_RISCV_SUB_ULEB128"); | |
2518 | r = bfd_reloc_dangerous; | |
2519 | } | |
2520 | break; | |
2521 | ||
2522 | case R_RISCV_SUB_ULEB128: | |
2523 | if (uleb128_set_rel != NULL | |
2524 | && uleb128_set_rel->r_offset == rel->r_offset) | |
2525 | { | |
2526 | relocation = uleb128_set_vma - relocation; | |
2527 | uleb128_set_vma = 0; | |
2528 | uleb128_set_rel = NULL; | |
2529 | } | |
2530 | else | |
2531 | { | |
2532 | msg = ("Mismatched R_RISCV_SUB_ULEB128, it must be paired with" | |
2533 | "and applied after R_RISCV_SET_ULEB128"); | |
2534 | r = bfd_reloc_dangerous; | |
2535 | } | |
2536 | break; | |
2537 | ||
e23eba97 NC |
2538 | case R_RISCV_GOT_HI20: |
2539 | if (h != NULL) | |
2540 | { | |
e23eba97 NC |
2541 | off = h->got.offset; |
2542 | BFD_ASSERT (off != (bfd_vma) -1); | |
e23eba97 | 2543 | |
23068b02 | 2544 | if (RISCV_RESOLVED_LOCALLY (info, h)) |
e23eba97 | 2545 | { |
23068b02 NC |
2546 | /* We must initialize this entry in the global offset table. |
2547 | Since the offset must always be a multiple of the word | |
2548 | size, we use the least significant bit to record whether | |
e23eba97 NC |
2549 | we have initialized it already. |
2550 | ||
2551 | When doing a dynamic link, we create a .rela.got | |
2552 | relocation entry to initialize the value. This | |
2553 | is done in the finish_dynamic_symbol routine. */ | |
2554 | if ((off & 1) != 0) | |
2555 | off &= ~1; | |
2556 | else | |
2557 | { | |
2558 | bfd_put_NN (output_bfd, relocation, | |
2559 | htab->elf.sgot->contents + off); | |
2560 | h->got.offset |= 1; | |
2561 | } | |
2562 | } | |
2563 | else | |
0a1b45a2 | 2564 | unresolved_reloc = false; |
e23eba97 NC |
2565 | } |
2566 | else | |
2567 | { | |
2568 | BFD_ASSERT (local_got_offsets != NULL | |
2569 | && local_got_offsets[r_symndx] != (bfd_vma) -1); | |
2570 | ||
2571 | off = local_got_offsets[r_symndx]; | |
2572 | ||
2573 | /* The offset must always be a multiple of the word size. | |
2574 | So, we can use the least significant bit to record | |
2575 | whether we have already processed this entry. */ | |
2576 | if ((off & 1) != 0) | |
2577 | off &= ~1; | |
2578 | else | |
2579 | { | |
2580 | if (bfd_link_pic (info)) | |
2581 | { | |
2582 | asection *s; | |
2583 | Elf_Internal_Rela outrel; | |
2584 | ||
2585 | /* We need to generate a R_RISCV_RELATIVE reloc | |
2586 | for the dynamic linker. */ | |
2587 | s = htab->elf.srelgot; | |
2588 | BFD_ASSERT (s != NULL); | |
2589 | ||
2590 | outrel.r_offset = sec_addr (htab->elf.sgot) + off; | |
2591 | outrel.r_info = | |
2592 | ELFNN_R_INFO (0, R_RISCV_RELATIVE); | |
2593 | outrel.r_addend = relocation; | |
2594 | relocation = 0; | |
2595 | riscv_elf_append_rela (output_bfd, s, &outrel); | |
2596 | } | |
2597 | ||
2598 | bfd_put_NN (output_bfd, relocation, | |
2599 | htab->elf.sgot->contents + off); | |
2600 | local_got_offsets[r_symndx] |= 1; | |
2601 | } | |
2602 | } | |
50331d64 NC |
2603 | |
2604 | if (rel->r_addend != 0) | |
2605 | { | |
2606 | msg = _("The addend isn't allowed for R_RISCV_GOT_HI20"); | |
2607 | r = bfd_reloc_dangerous; | |
2608 | } | |
2609 | else | |
2610 | { | |
2611 | /* Address of got entry. */ | |
2612 | relocation = sec_addr (htab->elf.sgot) + off; | |
2613 | absolute = riscv_zero_pcrel_hi_reloc (rel, info, pc, | |
2614 | relocation, contents, | |
2615 | howto); | |
2616 | /* Update howto if relocation is changed. */ | |
2617 | howto = riscv_elf_rtype_to_howto (input_bfd, | |
2618 | ELFNN_R_TYPE (rel->r_info)); | |
2619 | if (howto == NULL) | |
2620 | r = bfd_reloc_notsupported; | |
2621 | else if (!riscv_record_pcrel_hi_reloc (&pcrel_relocs, pc, | |
2622 | relocation, r_type, | |
2623 | absolute)) | |
2624 | r = bfd_reloc_overflow; | |
2625 | } | |
e23eba97 NC |
2626 | break; |
2627 | ||
2628 | case R_RISCV_ADD8: | |
2629 | case R_RISCV_ADD16: | |
2630 | case R_RISCV_ADD32: | |
2631 | case R_RISCV_ADD64: | |
2632 | { | |
2633 | bfd_vma old_value = bfd_get (howto->bitsize, input_bfd, | |
2634 | contents + rel->r_offset); | |
2635 | relocation = old_value + relocation; | |
2636 | } | |
2637 | break; | |
2638 | ||
45f76423 | 2639 | case R_RISCV_SUB6: |
06f0a892 XZ |
2640 | { |
2641 | bfd_vma old_value = bfd_get (howto->bitsize, input_bfd, | |
2642 | contents + rel->r_offset); | |
2643 | relocation = (old_value & ~howto->dst_mask) | |
2644 | | (((old_value & howto->dst_mask) - relocation) | |
2645 | & howto->dst_mask); | |
2646 | } | |
2647 | break; | |
2648 | ||
e23eba97 NC |
2649 | case R_RISCV_SUB8: |
2650 | case R_RISCV_SUB16: | |
2651 | case R_RISCV_SUB32: | |
2652 | case R_RISCV_SUB64: | |
2653 | { | |
2654 | bfd_vma old_value = bfd_get (howto->bitsize, input_bfd, | |
2655 | contents + rel->r_offset); | |
2656 | relocation = old_value - relocation; | |
2657 | } | |
2658 | break; | |
2659 | ||
e23eba97 | 2660 | case R_RISCV_CALL: |
85f78364 | 2661 | case R_RISCV_CALL_PLT: |
cf7a5066 JW |
2662 | /* Handle a call to an undefined weak function. This won't be |
2663 | relaxed, so we have to handle it here. */ | |
2664 | if (h != NULL && h->root.type == bfd_link_hash_undefweak | |
85f78364 | 2665 | && (!bfd_link_pic (info) || h->plt.offset == MINUS_ONE)) |
cf7a5066 JW |
2666 | { |
2667 | /* We can use x0 as the base register. */ | |
fbc09e7a | 2668 | bfd_vma insn = bfd_getl32 (contents + rel->r_offset + 4); |
cf7a5066 | 2669 | insn &= ~(OP_MASK_RS1 << OP_SH_RS1); |
fbc09e7a | 2670 | bfd_putl32 (insn, contents + rel->r_offset + 4); |
cf7a5066 JW |
2671 | /* Set the relocation value so that we get 0 after the pc |
2672 | relative adjustment. */ | |
2673 | relocation = sec_addr (input_section) + rel->r_offset; | |
2674 | } | |
2675 | /* Fall through. */ | |
2676 | ||
e23eba97 NC |
2677 | case R_RISCV_JAL: |
2678 | case R_RISCV_RVC_JUMP: | |
ecb915b4 | 2679 | if (bfd_link_pic (info) && h != NULL) |
e23eba97 | 2680 | { |
ecb915b4 NC |
2681 | if (h->plt.offset != MINUS_ONE) |
2682 | { | |
2683 | /* Refer to the PLT entry. This check has to match the | |
2684 | check in _bfd_riscv_relax_section. */ | |
2685 | relocation = sec_addr (htab->elf.splt) + h->plt.offset; | |
2686 | unresolved_reloc = false; | |
2687 | } | |
2688 | else if (!SYMBOL_REFERENCES_LOCAL (info, h) | |
2689 | && (input_section->flags & SEC_ALLOC) != 0 | |
2690 | && (input_section->flags & SEC_READONLY) != 0 | |
2691 | && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) | |
2692 | { | |
2693 | /* PR 28509, when generating the shared object, these | |
2694 | referenced symbols may bind externally, which means | |
2695 | they will be exported to the dynamic symbol table, | |
2696 | and are preemptible by default. These symbols cannot | |
2697 | be referenced by the non-pic relocations, like | |
2698 | R_RISCV_JAL and R_RISCV_RVC_JUMP relocations. | |
2699 | ||
2700 | However, consider that linker may relax the R_RISCV_CALL | |
2701 | relocations to R_RISCV_JAL or R_RISCV_RVC_JUMP, if | |
2702 | these relocations are relocated to the plt entries, | |
2703 | then we won't report error for them. | |
2704 | ||
2705 | Perhaps we also need the similar checks for the | |
2706 | R_RISCV_BRANCH and R_RISCV_RVC_BRANCH relocations. */ | |
6f860418 AM |
2707 | msg = bfd_asprintf (_("%%X%%P: relocation %s against `%s'" |
2708 | " which may bind externally" | |
2709 | " can not be used" | |
2710 | " when making a shared object;" | |
2711 | " recompile with -fPIC\n"), | |
2712 | howto->name, h->root.root.string); | |
ecb915b4 NC |
2713 | r = bfd_reloc_notsupported; |
2714 | } | |
e23eba97 NC |
2715 | } |
2716 | break; | |
2717 | ||
2718 | case R_RISCV_TPREL_HI20: | |
2719 | relocation = tpoff (info, relocation); | |
2720 | break; | |
2721 | ||
2722 | case R_RISCV_TPREL_LO12_I: | |
2723 | case R_RISCV_TPREL_LO12_S: | |
45f76423 AW |
2724 | relocation = tpoff (info, relocation); |
2725 | break; | |
2726 | ||
2727 | case R_RISCV_TPREL_I: | |
2728 | case R_RISCV_TPREL_S: | |
e23eba97 NC |
2729 | relocation = tpoff (info, relocation); |
2730 | if (VALID_ITYPE_IMM (relocation + rel->r_addend)) | |
2731 | { | |
2732 | /* We can use tp as the base register. */ | |
fbc09e7a | 2733 | bfd_vma insn = bfd_getl32 (contents + rel->r_offset); |
e23eba97 NC |
2734 | insn &= ~(OP_MASK_RS1 << OP_SH_RS1); |
2735 | insn |= X_TP << OP_SH_RS1; | |
fbc09e7a | 2736 | bfd_putl32 (insn, contents + rel->r_offset); |
e23eba97 | 2737 | } |
45f76423 AW |
2738 | else |
2739 | r = bfd_reloc_overflow; | |
e23eba97 NC |
2740 | break; |
2741 | ||
2742 | case R_RISCV_GPREL_I: | |
2743 | case R_RISCV_GPREL_S: | |
2744 | { | |
2745 | bfd_vma gp = riscv_global_pointer_value (info); | |
0a1b45a2 | 2746 | bool x0_base = VALID_ITYPE_IMM (relocation + rel->r_addend); |
e23eba97 NC |
2747 | if (x0_base || VALID_ITYPE_IMM (relocation + rel->r_addend - gp)) |
2748 | { | |
2749 | /* We can use x0 or gp as the base register. */ | |
fbc09e7a | 2750 | bfd_vma insn = bfd_getl32 (contents + rel->r_offset); |
e23eba97 NC |
2751 | insn &= ~(OP_MASK_RS1 << OP_SH_RS1); |
2752 | if (!x0_base) | |
2753 | { | |
2754 | rel->r_addend -= gp; | |
2755 | insn |= X_GP << OP_SH_RS1; | |
2756 | } | |
fbc09e7a | 2757 | bfd_putl32 (insn, contents + rel->r_offset); |
e23eba97 NC |
2758 | } |
2759 | else | |
2760 | r = bfd_reloc_overflow; | |
2761 | break; | |
2762 | } | |
2763 | ||
2764 | case R_RISCV_PCREL_HI20: | |
50331d64 NC |
2765 | absolute = riscv_zero_pcrel_hi_reloc (rel, info, pc, relocation, |
2766 | contents, howto); | |
2767 | /* Update howto if relocation is changed. */ | |
2768 | howto = riscv_elf_rtype_to_howto (input_bfd, | |
2769 | ELFNN_R_TYPE (rel->r_info)); | |
f3185997 NC |
2770 | if (howto == NULL) |
2771 | r = bfd_reloc_notsupported; | |
2772 | else if (!riscv_record_pcrel_hi_reloc (&pcrel_relocs, pc, | |
2773 | relocation + rel->r_addend, | |
50331d64 | 2774 | r_type, absolute)) |
e23eba97 NC |
2775 | r = bfd_reloc_overflow; |
2776 | break; | |
2777 | ||
2778 | case R_RISCV_PCREL_LO12_I: | |
2779 | case R_RISCV_PCREL_LO12_S: | |
551703cf JW |
2780 | /* We don't allow section symbols plus addends as the auipc address, |
2781 | because then riscv_relax_delete_bytes would have to search through | |
2782 | all relocs to update these addends. This is also ambiguous, as | |
2783 | we do allow offsets to be added to the target address, which are | |
2784 | not to be used to find the auipc address. */ | |
a9f5a551 JW |
2785 | if (((sym != NULL && (ELF_ST_TYPE (sym->st_info) == STT_SECTION)) |
2786 | || (h != NULL && h->type == STT_SECTION)) | |
2787 | && rel->r_addend) | |
2a0d9853 | 2788 | { |
330a6637 | 2789 | msg = _("%pcrel_lo section symbol with an addend"); |
2a0d9853 JW |
2790 | r = bfd_reloc_dangerous; |
2791 | break; | |
2792 | } | |
2793 | ||
50331d64 NC |
2794 | if (riscv_record_pcrel_lo_reloc (&pcrel_relocs, relocation, rel, |
2795 | input_section, info, howto, | |
e23eba97 NC |
2796 | contents)) |
2797 | continue; | |
2798 | r = bfd_reloc_overflow; | |
2799 | break; | |
2800 | ||
2801 | case R_RISCV_TLS_DTPREL32: | |
2802 | case R_RISCV_TLS_DTPREL64: | |
2803 | relocation = dtpoff (info, relocation); | |
2804 | break; | |
2805 | ||
2806 | case R_RISCV_32: | |
b679fb48 NC |
2807 | /* Non ABS symbol should be blocked in check_relocs. */ |
2808 | if (ARCH_SIZE > 32) | |
2809 | break; | |
2810 | /* Fall through. */ | |
2811 | ||
e23eba97 NC |
2812 | case R_RISCV_64: |
2813 | if ((input_section->flags & SEC_ALLOC) == 0) | |
2814 | break; | |
2815 | ||
23068b02 NC |
2816 | if (RISCV_GENERATE_DYNAMIC_RELOC (howto->pc_relative, info, h, |
2817 | resolved_to_zero)) | |
e23eba97 NC |
2818 | { |
2819 | Elf_Internal_Rela outrel; | |
02dd9d25 | 2820 | asection *sreloc; |
e23eba97 NC |
2821 | |
2822 | /* When generating a shared object, these relocations | |
2823 | are copied into the output file to be resolved at run | |
2824 | time. */ | |
2825 | ||
2826 | outrel.r_offset = | |
2827 | _bfd_elf_section_offset (output_bfd, info, input_section, | |
2828 | rel->r_offset); | |
b679fb48 NC |
2829 | bool skip = false; |
2830 | bool relocate = false; | |
2831 | if (outrel.r_offset == (bfd_vma) -1) | |
2832 | skip = true; | |
2833 | else if (outrel.r_offset == (bfd_vma) -2) | |
2834 | { | |
2835 | skip = true; | |
2836 | relocate = true; | |
2837 | } | |
2838 | else if (h != NULL && bfd_is_abs_symbol (&h->root)) | |
2839 | { | |
2840 | /* Don't need dynamic reloc when the ABS symbol is | |
2841 | non-dynamic or forced to local. Maybe just use | |
2842 | SYMBOL_REFERENCES_LOCAL to check? */ | |
2843 | skip = (h->forced_local || (h->dynindx == -1)); | |
2844 | relocate = skip; | |
2845 | } | |
2846 | ||
e23eba97 NC |
2847 | outrel.r_offset += sec_addr (input_section); |
2848 | ||
b679fb48 NC |
2849 | if (skip) |
2850 | memset (&outrel, 0, sizeof outrel); /* R_RISCV_NONE. */ | |
23068b02 | 2851 | else if (RISCV_COPY_INPUT_RELOC (info, h)) |
e23eba97 | 2852 | { |
b679fb48 | 2853 | /* Maybe just use !SYMBOL_REFERENCES_LOCAL to check? */ |
e23eba97 NC |
2854 | outrel.r_info = ELFNN_R_INFO (h->dynindx, r_type); |
2855 | outrel.r_addend = rel->r_addend; | |
2856 | } | |
2857 | else | |
2858 | { | |
b679fb48 | 2859 | /* This symbol is local, or marked to become local. */ |
e23eba97 NC |
2860 | outrel.r_info = ELFNN_R_INFO (0, R_RISCV_RELATIVE); |
2861 | outrel.r_addend = relocation + rel->r_addend; | |
2862 | } | |
2863 | ||
02dd9d25 | 2864 | sreloc = elf_section_data (input_section)->sreloc; |
e23eba97 | 2865 | riscv_elf_append_rela (output_bfd, sreloc, &outrel); |
b679fb48 | 2866 | if (!relocate) |
e23eba97 NC |
2867 | continue; |
2868 | } | |
2869 | break; | |
2870 | ||
2871 | case R_RISCV_TLS_GOT_HI20: | |
0a1b45a2 | 2872 | is_ie = true; |
e23eba97 NC |
2873 | /* Fall through. */ |
2874 | ||
2875 | case R_RISCV_TLS_GD_HI20: | |
2876 | if (h != NULL) | |
2877 | { | |
2878 | off = h->got.offset; | |
2879 | h->got.offset |= 1; | |
2880 | } | |
2881 | else | |
2882 | { | |
2883 | off = local_got_offsets[r_symndx]; | |
2884 | local_got_offsets[r_symndx] |= 1; | |
2885 | } | |
2886 | ||
2887 | tls_type = _bfd_riscv_elf_tls_type (input_bfd, h, r_symndx); | |
2888 | BFD_ASSERT (tls_type & (GOT_TLS_IE | GOT_TLS_GD)); | |
2889 | /* If this symbol is referenced by both GD and IE TLS, the IE | |
2890 | reference's GOT slot follows the GD reference's slots. */ | |
2891 | ie_off = 0; | |
2892 | if ((tls_type & GOT_TLS_GD) && (tls_type & GOT_TLS_IE)) | |
2893 | ie_off = 2 * GOT_ENTRY_SIZE; | |
2894 | ||
2895 | if ((off & 1) != 0) | |
2896 | off &= ~1; | |
2897 | else | |
2898 | { | |
2899 | Elf_Internal_Rela outrel; | |
2900 | int indx = 0; | |
0a1b45a2 | 2901 | bool need_relocs = false; |
e23eba97 NC |
2902 | |
2903 | if (htab->elf.srelgot == NULL) | |
2904 | abort (); | |
2905 | ||
225df051 | 2906 | bool dyn = elf_hash_table (info)->dynamic_sections_created; |
20ef84ed | 2907 | RISCV_TLS_GD_IE_NEED_DYN_RELOC (info, dyn, h, indx, need_relocs); |
e23eba97 NC |
2908 | |
2909 | /* The GOT entries have not been initialized yet. Do it | |
07d6d2b8 | 2910 | now, and emit any relocations. */ |
e23eba97 NC |
2911 | if (tls_type & GOT_TLS_GD) |
2912 | { | |
2913 | if (need_relocs) | |
2914 | { | |
2915 | outrel.r_offset = sec_addr (htab->elf.sgot) + off; | |
2916 | outrel.r_addend = 0; | |
2917 | outrel.r_info = ELFNN_R_INFO (indx, R_RISCV_TLS_DTPMODNN); | |
2918 | bfd_put_NN (output_bfd, 0, | |
2919 | htab->elf.sgot->contents + off); | |
2920 | riscv_elf_append_rela (output_bfd, htab->elf.srelgot, &outrel); | |
2921 | if (indx == 0) | |
2922 | { | |
2923 | BFD_ASSERT (! unresolved_reloc); | |
2924 | bfd_put_NN (output_bfd, | |
2925 | dtpoff (info, relocation), | |
1942a048 NC |
2926 | (htab->elf.sgot->contents |
2927 | + off + RISCV_ELF_WORD_BYTES)); | |
e23eba97 NC |
2928 | } |
2929 | else | |
2930 | { | |
2931 | bfd_put_NN (output_bfd, 0, | |
1942a048 NC |
2932 | (htab->elf.sgot->contents |
2933 | + off + RISCV_ELF_WORD_BYTES)); | |
e23eba97 NC |
2934 | outrel.r_info = ELFNN_R_INFO (indx, R_RISCV_TLS_DTPRELNN); |
2935 | outrel.r_offset += RISCV_ELF_WORD_BYTES; | |
2936 | riscv_elf_append_rela (output_bfd, htab->elf.srelgot, &outrel); | |
2937 | } | |
2938 | } | |
2939 | else | |
2940 | { | |
2941 | /* If we are not emitting relocations for a | |
2942 | general dynamic reference, then we must be in a | |
2943 | static link or an executable link with the | |
2944 | symbol binding locally. Mark it as belonging | |
2945 | to module 1, the executable. */ | |
2946 | bfd_put_NN (output_bfd, 1, | |
2947 | htab->elf.sgot->contents + off); | |
2948 | bfd_put_NN (output_bfd, | |
2949 | dtpoff (info, relocation), | |
1942a048 NC |
2950 | (htab->elf.sgot->contents |
2951 | + off + RISCV_ELF_WORD_BYTES)); | |
e23eba97 NC |
2952 | } |
2953 | } | |
2954 | ||
2955 | if (tls_type & GOT_TLS_IE) | |
2956 | { | |
2957 | if (need_relocs) | |
2958 | { | |
2959 | bfd_put_NN (output_bfd, 0, | |
2960 | htab->elf.sgot->contents + off + ie_off); | |
2961 | outrel.r_offset = sec_addr (htab->elf.sgot) | |
1942a048 | 2962 | + off + ie_off; |
e23eba97 NC |
2963 | outrel.r_addend = 0; |
2964 | if (indx == 0) | |
2965 | outrel.r_addend = tpoff (info, relocation); | |
2966 | outrel.r_info = ELFNN_R_INFO (indx, R_RISCV_TLS_TPRELNN); | |
2967 | riscv_elf_append_rela (output_bfd, htab->elf.srelgot, &outrel); | |
2968 | } | |
2969 | else | |
2970 | { | |
2971 | bfd_put_NN (output_bfd, tpoff (info, relocation), | |
2972 | htab->elf.sgot->contents + off + ie_off); | |
2973 | } | |
2974 | } | |
2975 | } | |
2976 | ||
2977 | BFD_ASSERT (off < (bfd_vma) -2); | |
2978 | relocation = sec_addr (htab->elf.sgot) + off + (is_ie ? ie_off : 0); | |
b1308d2c | 2979 | if (!riscv_record_pcrel_hi_reloc (&pcrel_relocs, pc, |
50331d64 NC |
2980 | relocation, r_type, |
2981 | false)) | |
e23eba97 | 2982 | r = bfd_reloc_overflow; |
0a1b45a2 | 2983 | unresolved_reloc = false; |
e23eba97 NC |
2984 | break; |
2985 | ||
2986 | default: | |
2987 | r = bfd_reloc_notsupported; | |
2988 | } | |
2989 | ||
2990 | /* Dynamic relocs are not propagated for SEC_DEBUGGING sections | |
2991 | because such sections are not SEC_ALLOC and thus ld.so will | |
2992 | not process them. */ | |
2993 | if (unresolved_reloc | |
2994 | && !((input_section->flags & SEC_DEBUGGING) != 0 | |
2995 | && h->def_dynamic) | |
2996 | && _bfd_elf_section_offset (output_bfd, info, input_section, | |
2997 | rel->r_offset) != (bfd_vma) -1) | |
2998 | { | |
6f860418 AM |
2999 | msg = bfd_asprintf (_("%%X%%P: unresolvable %s relocation against " |
3000 | "symbol `%s'\n"), | |
3001 | howto->name, | |
3002 | h->root.root.string); | |
330a6637 | 3003 | r = bfd_reloc_notsupported; |
e23eba97 NC |
3004 | } |
3005 | ||
02dd9d25 | 3006 | do_relocation: |
e23eba97 NC |
3007 | if (r == bfd_reloc_ok) |
3008 | r = perform_relocation (howto, rel, relocation, input_section, | |
3009 | input_bfd, contents); | |
3010 | ||
330a6637 JW |
3011 | /* We should have already detected the error and set message before. |
3012 | If the error message isn't set since the linker runs out of memory | |
3013 | or we don't set it before, then we should set the default message | |
3014 | with the "internal error" string here. */ | |
e23eba97 NC |
3015 | switch (r) |
3016 | { | |
3017 | case bfd_reloc_ok: | |
3018 | continue; | |
3019 | ||
3020 | case bfd_reloc_overflow: | |
3021 | info->callbacks->reloc_overflow | |
3022 | (info, (h ? &h->root : NULL), name, howto->name, | |
3023 | (bfd_vma) 0, input_bfd, input_section, rel->r_offset); | |
3024 | break; | |
3025 | ||
3026 | case bfd_reloc_undefined: | |
3027 | info->callbacks->undefined_symbol | |
3028 | (info, name, input_bfd, input_section, rel->r_offset, | |
0a1b45a2 | 3029 | true); |
e23eba97 NC |
3030 | break; |
3031 | ||
3032 | case bfd_reloc_outofrange: | |
330a6637 JW |
3033 | if (msg == NULL) |
3034 | msg = _("%X%P: internal error: out of range error\n"); | |
e23eba97 NC |
3035 | break; |
3036 | ||
3037 | case bfd_reloc_notsupported: | |
330a6637 JW |
3038 | if (msg == NULL) |
3039 | msg = _("%X%P: internal error: unsupported relocation error\n"); | |
e23eba97 NC |
3040 | break; |
3041 | ||
3042 | case bfd_reloc_dangerous: | |
330a6637 JW |
3043 | /* The error message should already be set. */ |
3044 | if (msg == NULL) | |
3045 | msg = _("dangerous relocation error"); | |
2a0d9853 | 3046 | info->callbacks->reloc_dangerous |
330a6637 | 3047 | (info, msg, input_bfd, input_section, rel->r_offset); |
e23eba97 NC |
3048 | break; |
3049 | ||
3050 | default: | |
2a0d9853 | 3051 | msg = _("%X%P: internal error: unknown error\n"); |
e23eba97 NC |
3052 | break; |
3053 | } | |
3054 | ||
330a6637 JW |
3055 | /* Do not report error message for the dangerous relocation again. */ |
3056 | if (msg && r != bfd_reloc_dangerous) | |
2a0d9853 JW |
3057 | info->callbacks->einfo (msg); |
3058 | ||
3f48fe4a JW |
3059 | /* We already reported the error via a callback, so don't try to report |
3060 | it again by returning false. That leads to spurious errors. */ | |
0a1b45a2 | 3061 | ret = true; |
e23eba97 NC |
3062 | goto out; |
3063 | } | |
3064 | ||
3065 | ret = riscv_resolve_pcrel_lo_relocs (&pcrel_relocs); | |
dc1e8a47 | 3066 | out: |
e23eba97 NC |
3067 | riscv_free_pcrel_relocs (&pcrel_relocs); |
3068 | return ret; | |
3069 | } | |
3070 | ||
3071 | /* Finish up dynamic symbol handling. We set the contents of various | |
3072 | dynamic sections here. */ | |
3073 | ||
0a1b45a2 | 3074 | static bool |
e23eba97 NC |
3075 | riscv_elf_finish_dynamic_symbol (bfd *output_bfd, |
3076 | struct bfd_link_info *info, | |
3077 | struct elf_link_hash_entry *h, | |
3078 | Elf_Internal_Sym *sym) | |
3079 | { | |
3080 | struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info); | |
3081 | const struct elf_backend_data *bed = get_elf_backend_data (output_bfd); | |
3082 | ||
3083 | if (h->plt.offset != (bfd_vma) -1) | |
3084 | { | |
3085 | /* We've decided to create a PLT entry for this symbol. */ | |
3086 | bfd_byte *loc; | |
02dd9d25 | 3087 | bfd_vma i, header_address, plt_idx, got_offset, got_address; |
e23eba97 NC |
3088 | uint32_t plt_entry[PLT_ENTRY_INSNS]; |
3089 | Elf_Internal_Rela rela; | |
02dd9d25 NC |
3090 | asection *plt, *gotplt, *relplt; |
3091 | ||
3092 | /* When building a static executable, use .iplt, .igot.plt and | |
3093 | .rela.iplt sections for STT_GNU_IFUNC symbols. */ | |
3094 | if (htab->elf.splt != NULL) | |
3095 | { | |
3096 | plt = htab->elf.splt; | |
3097 | gotplt = htab->elf.sgotplt; | |
3098 | relplt = htab->elf.srelplt; | |
3099 | } | |
3100 | else | |
3101 | { | |
3102 | plt = htab->elf.iplt; | |
3103 | gotplt = htab->elf.igotplt; | |
3104 | relplt = htab->elf.irelplt; | |
3105 | } | |
3106 | ||
3107 | /* This symbol has an entry in the procedure linkage table. Set | |
3108 | it up. */ | |
3109 | if ((h->dynindx == -1 | |
3110 | && !((h->forced_local || bfd_link_executable (info)) | |
3111 | && h->def_regular | |
3112 | && h->type == STT_GNU_IFUNC)) | |
3113 | || plt == NULL | |
3114 | || gotplt == NULL | |
3115 | || relplt == NULL) | |
0a1b45a2 | 3116 | return false; |
e23eba97 NC |
3117 | |
3118 | /* Calculate the address of the PLT header. */ | |
02dd9d25 | 3119 | header_address = sec_addr (plt); |
e23eba97 | 3120 | |
02dd9d25 NC |
3121 | /* Calculate the index of the entry and the offset of .got.plt entry. |
3122 | For static executables, we don't reserve anything. */ | |
3123 | if (plt == htab->elf.splt) | |
3124 | { | |
3125 | plt_idx = (h->plt.offset - PLT_HEADER_SIZE) / PLT_ENTRY_SIZE; | |
3126 | got_offset = GOTPLT_HEADER_SIZE + (plt_idx * GOT_ENTRY_SIZE); | |
3127 | } | |
3128 | else | |
3129 | { | |
3130 | plt_idx = h->plt.offset / PLT_ENTRY_SIZE; | |
3131 | got_offset = plt_idx * GOT_ENTRY_SIZE; | |
3132 | } | |
e23eba97 NC |
3133 | |
3134 | /* Calculate the address of the .got.plt entry. */ | |
02dd9d25 | 3135 | got_address = sec_addr (gotplt) + got_offset; |
e23eba97 NC |
3136 | |
3137 | /* Find out where the .plt entry should go. */ | |
02dd9d25 | 3138 | loc = plt->contents + h->plt.offset; |
e23eba97 NC |
3139 | |
3140 | /* Fill in the PLT entry itself. */ | |
5ef23793 JW |
3141 | if (! riscv_make_plt_entry (output_bfd, got_address, |
3142 | header_address + h->plt.offset, | |
3143 | plt_entry)) | |
0a1b45a2 | 3144 | return false; |
5ef23793 | 3145 | |
e23eba97 | 3146 | for (i = 0; i < PLT_ENTRY_INSNS; i++) |
fbc09e7a | 3147 | bfd_putl32 (plt_entry[i], loc + 4*i); |
e23eba97 NC |
3148 | |
3149 | /* Fill in the initial value of the .got.plt entry. */ | |
02dd9d25 NC |
3150 | loc = gotplt->contents + (got_address - sec_addr (gotplt)); |
3151 | bfd_put_NN (output_bfd, sec_addr (plt), loc); | |
e23eba97 | 3152 | |
e23eba97 | 3153 | rela.r_offset = got_address; |
e23eba97 | 3154 | |
02dd9d25 NC |
3155 | if (h->dynindx == -1 |
3156 | || ((bfd_link_executable (info) | |
3157 | || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) | |
3158 | && h->def_regular | |
3159 | && h->type == STT_GNU_IFUNC)) | |
3160 | { | |
3161 | info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"), | |
3162 | h->root.root.string, | |
3163 | h->root.u.def.section->owner); | |
3164 | ||
3165 | /* If an STT_GNU_IFUNC symbol is locally defined, generate | |
3166 | R_RISCV_IRELATIVE instead of R_RISCV_JUMP_SLOT. */ | |
3167 | asection *sec = h->root.u.def.section; | |
3168 | rela.r_info = ELFNN_R_INFO (0, R_RISCV_IRELATIVE); | |
3169 | rela.r_addend = h->root.u.def.value | |
3170 | + sec->output_section->vma | |
3171 | + sec->output_offset; | |
3172 | } | |
3173 | else | |
3174 | { | |
3175 | /* Fill in the entry in the .rela.plt section. */ | |
3176 | rela.r_info = ELFNN_R_INFO (h->dynindx, R_RISCV_JUMP_SLOT); | |
3177 | rela.r_addend = 0; | |
3178 | } | |
3179 | ||
3180 | loc = relplt->contents + plt_idx * sizeof (ElfNN_External_Rela); | |
e23eba97 NC |
3181 | bed->s->swap_reloca_out (output_bfd, &rela, loc); |
3182 | ||
3183 | if (!h->def_regular) | |
3184 | { | |
3185 | /* Mark the symbol as undefined, rather than as defined in | |
3186 | the .plt section. Leave the value alone. */ | |
3187 | sym->st_shndx = SHN_UNDEF; | |
3188 | /* If the symbol is weak, we do need to clear the value. | |
3189 | Otherwise, the PLT entry would provide a definition for | |
3190 | the symbol even if the symbol wasn't defined anywhere, | |
3191 | and so the symbol would never be NULL. */ | |
3192 | if (!h->ref_regular_nonweak) | |
3193 | sym->st_value = 0; | |
3194 | } | |
3195 | } | |
3196 | ||
3197 | if (h->got.offset != (bfd_vma) -1 | |
6487709f JW |
3198 | && !(riscv_elf_hash_entry (h)->tls_type & (GOT_TLS_GD | GOT_TLS_IE)) |
3199 | && !UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)) | |
e23eba97 NC |
3200 | { |
3201 | asection *sgot; | |
3202 | asection *srela; | |
3203 | Elf_Internal_Rela rela; | |
0a1b45a2 | 3204 | bool use_elf_append_rela = true; |
e23eba97 NC |
3205 | |
3206 | /* This symbol has an entry in the GOT. Set it up. */ | |
3207 | ||
3208 | sgot = htab->elf.sgot; | |
3209 | srela = htab->elf.srelgot; | |
3210 | BFD_ASSERT (sgot != NULL && srela != NULL); | |
3211 | ||
3212 | rela.r_offset = sec_addr (sgot) + (h->got.offset &~ (bfd_vma) 1); | |
3213 | ||
02dd9d25 NC |
3214 | /* Handle the ifunc symbol in GOT entry. */ |
3215 | if (h->def_regular | |
3216 | && h->type == STT_GNU_IFUNC) | |
3217 | { | |
3218 | if (h->plt.offset == (bfd_vma) -1) | |
3219 | { | |
3220 | /* STT_GNU_IFUNC is referenced without PLT. */ | |
51a8a7c2 | 3221 | |
02dd9d25 NC |
3222 | if (htab->elf.splt == NULL) |
3223 | { | |
51a8a7c2 | 3224 | /* Use .rela.iplt section to store .got relocations |
02dd9d25 NC |
3225 | in static executable. */ |
3226 | srela = htab->elf.irelplt; | |
51a8a7c2 NC |
3227 | |
3228 | /* Do not use riscv_elf_append_rela to add dynamic | |
3229 | relocs. */ | |
0a1b45a2 | 3230 | use_elf_append_rela = false; |
02dd9d25 | 3231 | } |
51a8a7c2 | 3232 | |
02dd9d25 NC |
3233 | if (SYMBOL_REFERENCES_LOCAL (info, h)) |
3234 | { | |
3235 | info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"), | |
3236 | h->root.root.string, | |
3237 | h->root.u.def.section->owner); | |
3238 | ||
3239 | rela.r_info = ELFNN_R_INFO (0, R_RISCV_IRELATIVE); | |
3240 | rela.r_addend = (h->root.u.def.value | |
3241 | + h->root.u.def.section->output_section->vma | |
3242 | + h->root.u.def.section->output_offset); | |
3243 | } | |
3244 | else | |
3245 | { | |
3246 | /* Generate R_RISCV_NN. */ | |
1942a048 | 3247 | BFD_ASSERT ((h->got.offset & 1) == 0); |
02dd9d25 NC |
3248 | BFD_ASSERT (h->dynindx != -1); |
3249 | rela.r_info = ELFNN_R_INFO (h->dynindx, R_RISCV_NN); | |
3250 | rela.r_addend = 0; | |
3251 | } | |
3252 | } | |
3253 | else if (bfd_link_pic (info)) | |
3254 | { | |
3255 | /* Generate R_RISCV_NN. */ | |
1942a048 | 3256 | BFD_ASSERT ((h->got.offset & 1) == 0); |
02dd9d25 NC |
3257 | BFD_ASSERT (h->dynindx != -1); |
3258 | rela.r_info = ELFNN_R_INFO (h->dynindx, R_RISCV_NN); | |
3259 | rela.r_addend = 0; | |
3260 | } | |
3261 | else | |
3262 | { | |
3263 | asection *plt; | |
3264 | ||
3265 | if (!h->pointer_equality_needed) | |
3266 | abort (); | |
3267 | ||
3268 | /* For non-shared object, we can't use .got.plt, which | |
3269 | contains the real function address if we need pointer | |
3270 | equality. We load the GOT entry with the PLT entry. */ | |
3271 | plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt; | |
3272 | bfd_put_NN (output_bfd, (plt->output_section->vma | |
3273 | + plt->output_offset | |
3274 | + h->plt.offset), | |
3275 | htab->elf.sgot->contents | |
3276 | + (h->got.offset & ~(bfd_vma) 1)); | |
0a1b45a2 | 3277 | return true; |
02dd9d25 NC |
3278 | } |
3279 | } | |
02dd9d25 NC |
3280 | else if (bfd_link_pic (info) |
3281 | && SYMBOL_REFERENCES_LOCAL (info, h)) | |
e23eba97 | 3282 | { |
51a8a7c2 NC |
3283 | /* If this is a local symbol reference, we just want to emit |
3284 | a RELATIVE reloc. This can happen if it is a -Bsymbolic link, | |
3285 | or a pie link, or the symbol was forced to be local because | |
3286 | of a version file. The entry in the global offset table will | |
3287 | already have been initialized in the relocate_section function. */ | |
1942a048 | 3288 | BFD_ASSERT ((h->got.offset & 1) != 0); |
e23eba97 NC |
3289 | asection *sec = h->root.u.def.section; |
3290 | rela.r_info = ELFNN_R_INFO (0, R_RISCV_RELATIVE); | |
3291 | rela.r_addend = (h->root.u.def.value | |
3292 | + sec->output_section->vma | |
3293 | + sec->output_offset); | |
3294 | } | |
3295 | else | |
3296 | { | |
1942a048 | 3297 | BFD_ASSERT ((h->got.offset & 1) == 0); |
e23eba97 NC |
3298 | BFD_ASSERT (h->dynindx != -1); |
3299 | rela.r_info = ELFNN_R_INFO (h->dynindx, R_RISCV_NN); | |
3300 | rela.r_addend = 0; | |
3301 | } | |
3302 | ||
3303 | bfd_put_NN (output_bfd, 0, | |
3304 | sgot->contents + (h->got.offset & ~(bfd_vma) 1)); | |
51a8a7c2 NC |
3305 | |
3306 | if (use_elf_append_rela) | |
3307 | riscv_elf_append_rela (output_bfd, srela, &rela); | |
3308 | else | |
3309 | { | |
3310 | /* Use riscv_elf_append_rela to add the dynamic relocs into | |
3311 | .rela.iplt may cause the overwrite problems. Since we insert | |
3312 | the relocs for PLT didn't handle the reloc_index of .rela.iplt, | |
3313 | but the riscv_elf_append_rela adds the relocs to the place | |
3314 | that are calculated from the reloc_index (in seqential). | |
3315 | ||
3316 | One solution is that add these dynamic relocs (GOT IFUNC) | |
3317 | from the last of .rela.iplt section. */ | |
3318 | bfd_vma iplt_idx = htab->last_iplt_index--; | |
3319 | bfd_byte *loc = srela->contents | |
3320 | + iplt_idx * sizeof (ElfNN_External_Rela); | |
3321 | bed->s->swap_reloca_out (output_bfd, &rela, loc); | |
3322 | } | |
e23eba97 NC |
3323 | } |
3324 | ||
3325 | if (h->needs_copy) | |
3326 | { | |
3327 | Elf_Internal_Rela rela; | |
5474d94f | 3328 | asection *s; |
e23eba97 NC |
3329 | |
3330 | /* This symbols needs a copy reloc. Set it up. */ | |
3331 | BFD_ASSERT (h->dynindx != -1); | |
3332 | ||
3333 | rela.r_offset = sec_addr (h->root.u.def.section) + h->root.u.def.value; | |
3334 | rela.r_info = ELFNN_R_INFO (h->dynindx, R_RISCV_COPY); | |
3335 | rela.r_addend = 0; | |
afbf7e8e | 3336 | if (h->root.u.def.section == htab->elf.sdynrelro) |
5474d94f AM |
3337 | s = htab->elf.sreldynrelro; |
3338 | else | |
3339 | s = htab->elf.srelbss; | |
3340 | riscv_elf_append_rela (output_bfd, s, &rela); | |
e23eba97 NC |
3341 | } |
3342 | ||
3343 | /* Mark some specially defined symbols as absolute. */ | |
3344 | if (h == htab->elf.hdynamic | |
3345 | || (h == htab->elf.hgot || h == htab->elf.hplt)) | |
3346 | sym->st_shndx = SHN_ABS; | |
3347 | ||
0a1b45a2 | 3348 | return true; |
e23eba97 NC |
3349 | } |
3350 | ||
02dd9d25 NC |
3351 | /* Finish up local dynamic symbol handling. We set the contents of |
3352 | various dynamic sections here. */ | |
3353 | ||
1201fda6 | 3354 | static int |
02dd9d25 NC |
3355 | riscv_elf_finish_local_dynamic_symbol (void **slot, void *inf) |
3356 | { | |
3357 | struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) *slot; | |
3358 | struct bfd_link_info *info = (struct bfd_link_info *) inf; | |
3359 | ||
3360 | return riscv_elf_finish_dynamic_symbol (info->output_bfd, info, h, NULL); | |
3361 | } | |
3362 | ||
e23eba97 NC |
3363 | /* Finish up the dynamic sections. */ |
3364 | ||
0a1b45a2 | 3365 | static bool |
e23eba97 NC |
3366 | riscv_finish_dyn (bfd *output_bfd, struct bfd_link_info *info, |
3367 | bfd *dynobj, asection *sdyn) | |
3368 | { | |
3369 | struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info); | |
3370 | const struct elf_backend_data *bed = get_elf_backend_data (output_bfd); | |
3371 | size_t dynsize = bed->s->sizeof_dyn; | |
3372 | bfd_byte *dyncon, *dynconend; | |
3373 | ||
3374 | dynconend = sdyn->contents + sdyn->size; | |
3375 | for (dyncon = sdyn->contents; dyncon < dynconend; dyncon += dynsize) | |
3376 | { | |
3377 | Elf_Internal_Dyn dyn; | |
3378 | asection *s; | |
3379 | ||
3380 | bed->s->swap_dyn_in (dynobj, dyncon, &dyn); | |
3381 | ||
3382 | switch (dyn.d_tag) | |
3383 | { | |
3384 | case DT_PLTGOT: | |
3385 | s = htab->elf.sgotplt; | |
3386 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; | |
3387 | break; | |
3388 | case DT_JMPREL: | |
3389 | s = htab->elf.srelplt; | |
3390 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; | |
3391 | break; | |
3392 | case DT_PLTRELSZ: | |
3393 | s = htab->elf.srelplt; | |
3394 | dyn.d_un.d_val = s->size; | |
3395 | break; | |
3396 | default: | |
3397 | continue; | |
3398 | } | |
3399 | ||
3400 | bed->s->swap_dyn_out (output_bfd, &dyn, dyncon); | |
3401 | } | |
0a1b45a2 | 3402 | return true; |
e23eba97 NC |
3403 | } |
3404 | ||
0a1b45a2 | 3405 | static bool |
e23eba97 NC |
3406 | riscv_elf_finish_dynamic_sections (bfd *output_bfd, |
3407 | struct bfd_link_info *info) | |
3408 | { | |
3409 | bfd *dynobj; | |
3410 | asection *sdyn; | |
3411 | struct riscv_elf_link_hash_table *htab; | |
3412 | ||
3413 | htab = riscv_elf_hash_table (info); | |
3414 | BFD_ASSERT (htab != NULL); | |
3415 | dynobj = htab->elf.dynobj; | |
3416 | ||
3417 | sdyn = bfd_get_linker_section (dynobj, ".dynamic"); | |
3418 | ||
3419 | if (elf_hash_table (info)->dynamic_sections_created) | |
3420 | { | |
3421 | asection *splt; | |
0a1b45a2 | 3422 | bool ret; |
e23eba97 NC |
3423 | |
3424 | splt = htab->elf.splt; | |
3425 | BFD_ASSERT (splt != NULL && sdyn != NULL); | |
3426 | ||
3427 | ret = riscv_finish_dyn (output_bfd, info, dynobj, sdyn); | |
3428 | ||
535b785f | 3429 | if (!ret) |
e23eba97 NC |
3430 | return ret; |
3431 | ||
3432 | /* Fill in the head and tail entries in the procedure linkage table. */ | |
3433 | if (splt->size > 0) | |
3434 | { | |
3435 | int i; | |
3436 | uint32_t plt_header[PLT_HEADER_INSNS]; | |
5ef23793 JW |
3437 | ret = riscv_make_plt_header (output_bfd, |
3438 | sec_addr (htab->elf.sgotplt), | |
3439 | sec_addr (splt), plt_header); | |
3440 | if (!ret) | |
3441 | return ret; | |
e23eba97 NC |
3442 | |
3443 | for (i = 0; i < PLT_HEADER_INSNS; i++) | |
fbc09e7a | 3444 | bfd_putl32 (plt_header[i], splt->contents + 4*i); |
e23eba97 | 3445 | |
cc162427 AW |
3446 | elf_section_data (splt->output_section)->this_hdr.sh_entsize |
3447 | = PLT_ENTRY_SIZE; | |
3448 | } | |
e23eba97 NC |
3449 | } |
3450 | ||
3451 | if (htab->elf.sgotplt) | |
3452 | { | |
3453 | asection *output_section = htab->elf.sgotplt->output_section; | |
3454 | ||
3455 | if (bfd_is_abs_section (output_section)) | |
3456 | { | |
3457 | (*_bfd_error_handler) | |
871b3ab2 | 3458 | (_("discarded output section: `%pA'"), htab->elf.sgotplt); |
0a1b45a2 | 3459 | return false; |
e23eba97 NC |
3460 | } |
3461 | ||
3462 | if (htab->elf.sgotplt->size > 0) | |
3463 | { | |
3464 | /* Write the first two entries in .got.plt, needed for the dynamic | |
3465 | linker. */ | |
3466 | bfd_put_NN (output_bfd, (bfd_vma) -1, htab->elf.sgotplt->contents); | |
3467 | bfd_put_NN (output_bfd, (bfd_vma) 0, | |
3468 | htab->elf.sgotplt->contents + GOT_ENTRY_SIZE); | |
3469 | } | |
3470 | ||
3471 | elf_section_data (output_section)->this_hdr.sh_entsize = GOT_ENTRY_SIZE; | |
3472 | } | |
3473 | ||
3474 | if (htab->elf.sgot) | |
3475 | { | |
3476 | asection *output_section = htab->elf.sgot->output_section; | |
3477 | ||
3478 | if (htab->elf.sgot->size > 0) | |
3479 | { | |
3480 | /* Set the first entry in the global offset table to the address of | |
3481 | the dynamic section. */ | |
3482 | bfd_vma val = sdyn ? sec_addr (sdyn) : 0; | |
3483 | bfd_put_NN (output_bfd, val, htab->elf.sgot->contents); | |
3484 | } | |
3485 | ||
3486 | elf_section_data (output_section)->this_hdr.sh_entsize = GOT_ENTRY_SIZE; | |
3487 | } | |
3488 | ||
02dd9d25 NC |
3489 | /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */ |
3490 | htab_traverse (htab->loc_hash_table, | |
3491 | riscv_elf_finish_local_dynamic_symbol, | |
3492 | info); | |
3493 | ||
0a1b45a2 | 3494 | return true; |
e23eba97 NC |
3495 | } |
3496 | ||
3497 | /* Return address for Ith PLT stub in section PLT, for relocation REL | |
3498 | or (bfd_vma) -1 if it should not be included. */ | |
3499 | ||
3500 | static bfd_vma | |
3501 | riscv_elf_plt_sym_val (bfd_vma i, const asection *plt, | |
3502 | const arelent *rel ATTRIBUTE_UNUSED) | |
3503 | { | |
3504 | return plt->vma + PLT_HEADER_SIZE + i * PLT_ENTRY_SIZE; | |
3505 | } | |
3506 | ||
3507 | static enum elf_reloc_type_class | |
3508 | riscv_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED, | |
3509 | const asection *rel_sec ATTRIBUTE_UNUSED, | |
3510 | const Elf_Internal_Rela *rela) | |
3511 | { | |
3512 | switch (ELFNN_R_TYPE (rela->r_info)) | |
3513 | { | |
3514 | case R_RISCV_RELATIVE: | |
3515 | return reloc_class_relative; | |
3516 | case R_RISCV_JUMP_SLOT: | |
3517 | return reloc_class_plt; | |
3518 | case R_RISCV_COPY: | |
3519 | return reloc_class_copy; | |
3520 | default: | |
3521 | return reloc_class_normal; | |
3522 | } | |
3523 | } | |
3524 | ||
0242af40 JW |
3525 | /* Given the ELF header flags in FLAGS, it returns a string that describes the |
3526 | float ABI. */ | |
3527 | ||
3528 | static const char * | |
3529 | riscv_float_abi_string (flagword flags) | |
3530 | { | |
3531 | switch (flags & EF_RISCV_FLOAT_ABI) | |
3532 | { | |
3533 | case EF_RISCV_FLOAT_ABI_SOFT: | |
3534 | return "soft-float"; | |
3535 | break; | |
3536 | case EF_RISCV_FLOAT_ABI_SINGLE: | |
3537 | return "single-float"; | |
3538 | break; | |
3539 | case EF_RISCV_FLOAT_ABI_DOUBLE: | |
3540 | return "double-float"; | |
3541 | break; | |
3542 | case EF_RISCV_FLOAT_ABI_QUAD: | |
3543 | return "quad-float"; | |
3544 | break; | |
3545 | default: | |
3546 | abort (); | |
3547 | } | |
3548 | } | |
3549 | ||
dcd709e0 | 3550 | /* The information of architecture elf attributes. */ |
7d7a7d7c JW |
3551 | static riscv_subset_list_t in_subsets; |
3552 | static riscv_subset_list_t out_subsets; | |
3553 | static riscv_subset_list_t merged_subsets; | |
3554 | ||
3555 | /* Predicator for standard extension. */ | |
3556 | ||
0a1b45a2 | 3557 | static bool |
7d7a7d7c JW |
3558 | riscv_std_ext_p (const char *name) |
3559 | { | |
3560 | return (strlen (name) == 1) && (name[0] != 'x') && (name[0] != 's'); | |
3561 | } | |
3562 | ||
87fdd7ac PD |
3563 | /* Update the output subset's version to match the input when the input |
3564 | subset's version is newer. */ | |
7d7a7d7c | 3565 | |
87fdd7ac PD |
3566 | static void |
3567 | riscv_update_subset_version (struct riscv_subset_t *in, | |
3568 | struct riscv_subset_t *out) | |
7d7a7d7c | 3569 | { |
32f0ce4d | 3570 | if (in == NULL || out == NULL) |
87fdd7ac PD |
3571 | return; |
3572 | ||
3573 | /* Update the output ISA versions to the newest ones, but otherwise don't | |
3574 | provide any errors or warnings about mis-matched ISA versions as it's | |
3575 | generally too tricky to check for these at link time. */ | |
3576 | if ((in->major_version > out->major_version) | |
3577 | || (in->major_version == out->major_version | |
3578 | && in->minor_version > out->minor_version) | |
3579 | || (out->major_version == RISCV_UNKNOWN_VERSION)) | |
32f0ce4d | 3580 | { |
87fdd7ac PD |
3581 | out->major_version = in->major_version; |
3582 | out->minor_version = in->minor_version; | |
32f0ce4d | 3583 | } |
7d7a7d7c JW |
3584 | } |
3585 | ||
3586 | /* Return true if subset is 'i' or 'e'. */ | |
3587 | ||
0a1b45a2 | 3588 | static bool |
7d7a7d7c JW |
3589 | riscv_i_or_e_p (bfd *ibfd, |
3590 | const char *arch, | |
3591 | struct riscv_subset_t *subset) | |
3592 | { | |
3593 | if ((strcasecmp (subset->name, "e") != 0) | |
3594 | && (strcasecmp (subset->name, "i") != 0)) | |
3595 | { | |
3596 | _bfd_error_handler | |
9184ef8a NC |
3597 | (_("error: %pB: corrupted ISA string '%s'. " |
3598 | "First letter should be 'i' or 'e' but got '%s'"), | |
7d7a7d7c | 3599 | ibfd, arch, subset->name); |
0a1b45a2 | 3600 | return false; |
7d7a7d7c | 3601 | } |
0a1b45a2 | 3602 | return true; |
7d7a7d7c JW |
3603 | } |
3604 | ||
3605 | /* Merge standard extensions. | |
3606 | ||
3607 | Return Value: | |
3608 | Return FALSE if failed to merge. | |
3609 | ||
3610 | Arguments: | |
3611 | `bfd`: bfd handler. | |
dcd709e0 NC |
3612 | `in_arch`: Raw ISA string for input object. |
3613 | `out_arch`: Raw ISA string for output object. | |
3614 | `pin`: Subset list for input object. | |
3615 | `pout`: Subset list for output object. */ | |
7d7a7d7c | 3616 | |
0a1b45a2 | 3617 | static bool |
7d7a7d7c JW |
3618 | riscv_merge_std_ext (bfd *ibfd, |
3619 | const char *in_arch, | |
3620 | const char *out_arch, | |
3621 | struct riscv_subset_t **pin, | |
3622 | struct riscv_subset_t **pout) | |
3623 | { | |
c341f467 | 3624 | const char *standard_exts = "mafdqlcbjtpvnh"; |
7d7a7d7c JW |
3625 | const char *p; |
3626 | struct riscv_subset_t *in = *pin; | |
3627 | struct riscv_subset_t *out = *pout; | |
3628 | ||
3629 | /* First letter should be 'i' or 'e'. */ | |
3630 | if (!riscv_i_or_e_p (ibfd, in_arch, in)) | |
0a1b45a2 | 3631 | return false; |
7d7a7d7c JW |
3632 | |
3633 | if (!riscv_i_or_e_p (ibfd, out_arch, out)) | |
0a1b45a2 | 3634 | return false; |
7d7a7d7c | 3635 | |
8f595e9b | 3636 | if (strcasecmp (in->name, out->name) != 0) |
7d7a7d7c JW |
3637 | { |
3638 | /* TODO: We might allow merge 'i' with 'e'. */ | |
3639 | _bfd_error_handler | |
9184ef8a | 3640 | (_("error: %pB: mis-matched ISA string to merge '%s' and '%s'"), |
7d7a7d7c | 3641 | ibfd, in->name, out->name); |
0a1b45a2 | 3642 | return false; |
7d7a7d7c | 3643 | } |
87fdd7ac PD |
3644 | |
3645 | riscv_update_subset_version(in, out); | |
3646 | riscv_add_subset (&merged_subsets, | |
3647 | out->name, out->major_version, out->minor_version); | |
7d7a7d7c JW |
3648 | |
3649 | in = in->next; | |
3650 | out = out->next; | |
3651 | ||
3652 | /* Handle standard extension first. */ | |
3653 | for (p = standard_exts; *p; ++p) | |
3654 | { | |
dfe92496 | 3655 | struct riscv_subset_t *ext_in, *ext_out, *ext_merged; |
7d7a7d7c | 3656 | char find_ext[2] = {*p, '\0'}; |
0a1b45a2 | 3657 | bool find_in, find_out; |
7d7a7d7c | 3658 | |
dfe92496 NC |
3659 | find_in = riscv_lookup_subset (&in_subsets, find_ext, &ext_in); |
3660 | find_out = riscv_lookup_subset (&out_subsets, find_ext, &ext_out); | |
3661 | ||
3662 | if (!find_in && !find_out) | |
7d7a7d7c JW |
3663 | continue; |
3664 | ||
87fdd7ac PD |
3665 | if (find_in && find_out) |
3666 | riscv_update_subset_version(ext_in, ext_out); | |
7d7a7d7c | 3667 | |
dfe92496 NC |
3668 | ext_merged = find_out ? ext_out : ext_in; |
3669 | riscv_add_subset (&merged_subsets, ext_merged->name, | |
3670 | ext_merged->major_version, ext_merged->minor_version); | |
7d7a7d7c JW |
3671 | } |
3672 | ||
3673 | /* Skip all standard extensions. */ | |
3674 | while ((in != NULL) && riscv_std_ext_p (in->name)) in = in->next; | |
3675 | while ((out != NULL) && riscv_std_ext_p (out->name)) out = out->next; | |
3676 | ||
3677 | *pin = in; | |
3678 | *pout = out; | |
3679 | ||
0a1b45a2 | 3680 | return true; |
7d7a7d7c JW |
3681 | } |
3682 | ||
403d1bd9 JW |
3683 | /* Merge multi letter extensions. PIN is a pointer to the head of the input |
3684 | object subset list. Likewise for POUT and the output object. Return TRUE | |
3685 | on success and FALSE when a conflict is found. */ | |
7d7a7d7c | 3686 | |
0a1b45a2 | 3687 | static bool |
87fdd7ac | 3688 | riscv_merge_multi_letter_ext (riscv_subset_t **pin, |
403d1bd9 | 3689 | riscv_subset_t **pout) |
7d7a7d7c JW |
3690 | { |
3691 | riscv_subset_t *in = *pin; | |
3692 | riscv_subset_t *out = *pout; | |
403d1bd9 | 3693 | riscv_subset_t *tail; |
7d7a7d7c | 3694 | |
403d1bd9 | 3695 | int cmp; |
7d7a7d7c | 3696 | |
403d1bd9 | 3697 | while (in && out) |
7d7a7d7c | 3698 | { |
4c0e540e | 3699 | cmp = riscv_compare_subsets (in->name, out->name); |
403d1bd9 JW |
3700 | |
3701 | if (cmp < 0) | |
3702 | { | |
3703 | /* `in' comes before `out', append `in' and increment. */ | |
3704 | riscv_add_subset (&merged_subsets, in->name, in->major_version, | |
3705 | in->minor_version); | |
3706 | in = in->next; | |
3707 | } | |
3708 | else if (cmp > 0) | |
3709 | { | |
3710 | /* `out' comes before `in', append `out' and increment. */ | |
3711 | riscv_add_subset (&merged_subsets, out->name, out->major_version, | |
3712 | out->minor_version); | |
3713 | out = out->next; | |
3714 | } | |
3715 | else | |
7d7a7d7c | 3716 | { |
403d1bd9 | 3717 | /* Both present, check version and increment both. */ |
87fdd7ac | 3718 | riscv_update_subset_version (in, out); |
403d1bd9 JW |
3719 | |
3720 | riscv_add_subset (&merged_subsets, out->name, out->major_version, | |
3721 | out->minor_version); | |
3722 | out = out->next; | |
3723 | in = in->next; | |
7d7a7d7c | 3724 | } |
7d7a7d7c JW |
3725 | } |
3726 | ||
1942a048 NC |
3727 | if (in || out) |
3728 | { | |
3729 | /* If we're here, either `in' or `out' is running longer than | |
3730 | the other. So, we need to append the corresponding tail. */ | |
3731 | tail = in ? in : out; | |
3732 | while (tail) | |
3733 | { | |
3734 | riscv_add_subset (&merged_subsets, tail->name, tail->major_version, | |
3735 | tail->minor_version); | |
3736 | tail = tail->next; | |
3737 | } | |
3738 | } | |
403d1bd9 | 3739 | |
0a1b45a2 | 3740 | return true; |
7d7a7d7c JW |
3741 | } |
3742 | ||
3743 | /* Merge Tag_RISCV_arch attribute. */ | |
3744 | ||
3745 | static char * | |
3746 | riscv_merge_arch_attr_info (bfd *ibfd, char *in_arch, char *out_arch) | |
3747 | { | |
3748 | riscv_subset_t *in, *out; | |
3749 | char *merged_arch_str; | |
3750 | ||
3751 | unsigned xlen_in, xlen_out; | |
3752 | merged_subsets.head = NULL; | |
3753 | merged_subsets.tail = NULL; | |
3754 | ||
f786c359 NC |
3755 | riscv_parse_subset_t riscv_rps_ld_in = |
3756 | {&in_subsets, _bfd_error_handler, &xlen_in, NULL, false}; | |
3757 | riscv_parse_subset_t riscv_rps_ld_out = | |
3758 | {&out_subsets, _bfd_error_handler, &xlen_out, NULL, false}; | |
7d7a7d7c JW |
3759 | |
3760 | if (in_arch == NULL && out_arch == NULL) | |
3761 | return NULL; | |
7d7a7d7c JW |
3762 | if (in_arch == NULL && out_arch != NULL) |
3763 | return out_arch; | |
7d7a7d7c JW |
3764 | if (in_arch != NULL && out_arch == NULL) |
3765 | return in_arch; | |
3766 | ||
dcd709e0 | 3767 | /* Parse subset from ISA string. */ |
f786c359 | 3768 | if (!riscv_parse_subset (&riscv_rps_ld_in, in_arch)) |
7d7a7d7c | 3769 | return NULL; |
f786c359 | 3770 | if (!riscv_parse_subset (&riscv_rps_ld_out, out_arch)) |
7d7a7d7c JW |
3771 | return NULL; |
3772 | ||
3773 | /* Checking XLEN. */ | |
3774 | if (xlen_out != xlen_in) | |
3775 | { | |
3776 | _bfd_error_handler | |
3777 | (_("error: %pB: ISA string of input (%s) doesn't match " | |
9184ef8a | 3778 | "output (%s)"), ibfd, in_arch, out_arch); |
7d7a7d7c JW |
3779 | return NULL; |
3780 | } | |
3781 | ||
3782 | /* Merge subset list. */ | |
3783 | in = in_subsets.head; | |
3784 | out = out_subsets.head; | |
3785 | ||
3786 | /* Merge standard extension. */ | |
3787 | if (!riscv_merge_std_ext (ibfd, in_arch, out_arch, &in, &out)) | |
3788 | return NULL; | |
403d1bd9 JW |
3789 | |
3790 | /* Merge all non-single letter extensions with single call. */ | |
87fdd7ac | 3791 | if (!riscv_merge_multi_letter_ext (&in, &out)) |
7d7a7d7c JW |
3792 | return NULL; |
3793 | ||
3794 | if (xlen_in != xlen_out) | |
3795 | { | |
3796 | _bfd_error_handler | |
3797 | (_("error: %pB: XLEN of input (%u) doesn't match " | |
9184ef8a | 3798 | "output (%u)"), ibfd, xlen_in, xlen_out); |
7d7a7d7c JW |
3799 | return NULL; |
3800 | } | |
3801 | ||
3802 | if (xlen_in != ARCH_SIZE) | |
3803 | { | |
3804 | _bfd_error_handler | |
9184ef8a NC |
3805 | (_("error: %pB: unsupported XLEN (%u), you might be " |
3806 | "using wrong emulation"), ibfd, xlen_in); | |
7d7a7d7c JW |
3807 | return NULL; |
3808 | } | |
3809 | ||
3810 | merged_arch_str = riscv_arch_str (ARCH_SIZE, &merged_subsets); | |
3811 | ||
3812 | /* Release the subset lists. */ | |
3813 | riscv_release_subset_list (&in_subsets); | |
3814 | riscv_release_subset_list (&out_subsets); | |
3815 | riscv_release_subset_list (&merged_subsets); | |
3816 | ||
3817 | return merged_arch_str; | |
3818 | } | |
3819 | ||
3820 | /* Merge object attributes from IBFD into output_bfd of INFO. | |
3821 | Raise an error if there are conflicting attributes. */ | |
3822 | ||
0a1b45a2 | 3823 | static bool |
7d7a7d7c JW |
3824 | riscv_merge_attributes (bfd *ibfd, struct bfd_link_info *info) |
3825 | { | |
3826 | bfd *obfd = info->output_bfd; | |
3827 | obj_attribute *in_attr; | |
3828 | obj_attribute *out_attr; | |
0a1b45a2 AM |
3829 | bool result = true; |
3830 | bool priv_attrs_merged = false; | |
7d7a7d7c JW |
3831 | const char *sec_name = get_elf_backend_data (ibfd)->obj_attrs_section; |
3832 | unsigned int i; | |
3833 | ||
3834 | /* Skip linker created files. */ | |
3835 | if (ibfd->flags & BFD_LINKER_CREATED) | |
0a1b45a2 | 3836 | return true; |
7d7a7d7c JW |
3837 | |
3838 | /* Skip any input that doesn't have an attribute section. | |
3839 | This enables to link object files without attribute section with | |
3840 | any others. */ | |
3841 | if (bfd_get_section_by_name (ibfd, sec_name) == NULL) | |
0a1b45a2 | 3842 | return true; |
7d7a7d7c JW |
3843 | |
3844 | if (!elf_known_obj_attributes_proc (obfd)[0].i) | |
3845 | { | |
3846 | /* This is the first object. Copy the attributes. */ | |
3847 | _bfd_elf_copy_obj_attributes (ibfd, obfd); | |
3848 | ||
3849 | out_attr = elf_known_obj_attributes_proc (obfd); | |
3850 | ||
3851 | /* Use the Tag_null value to indicate the attributes have been | |
3852 | initialized. */ | |
3853 | out_attr[0].i = 1; | |
3854 | ||
0a1b45a2 | 3855 | return true; |
7d7a7d7c JW |
3856 | } |
3857 | ||
3858 | in_attr = elf_known_obj_attributes_proc (ibfd); | |
3859 | out_attr = elf_known_obj_attributes_proc (obfd); | |
3860 | ||
3861 | for (i = LEAST_KNOWN_OBJ_ATTRIBUTE; i < NUM_KNOWN_OBJ_ATTRIBUTES; i++) | |
3862 | { | |
3863 | switch (i) | |
3864 | { | |
3865 | case Tag_RISCV_arch: | |
3866 | if (!out_attr[Tag_RISCV_arch].s) | |
3867 | out_attr[Tag_RISCV_arch].s = in_attr[Tag_RISCV_arch].s; | |
3868 | else if (in_attr[Tag_RISCV_arch].s | |
3869 | && out_attr[Tag_RISCV_arch].s) | |
3870 | { | |
dcd709e0 | 3871 | /* Check compatible. */ |
7d7a7d7c JW |
3872 | char *merged_arch = |
3873 | riscv_merge_arch_attr_info (ibfd, | |
3874 | in_attr[Tag_RISCV_arch].s, | |
3875 | out_attr[Tag_RISCV_arch].s); | |
3876 | if (merged_arch == NULL) | |
3877 | { | |
0a1b45a2 | 3878 | result = false; |
7d7a7d7c JW |
3879 | out_attr[Tag_RISCV_arch].s = ""; |
3880 | } | |
3881 | else | |
3882 | out_attr[Tag_RISCV_arch].s = merged_arch; | |
3883 | } | |
3884 | break; | |
41285764 | 3885 | |
7d7a7d7c JW |
3886 | case Tag_RISCV_priv_spec: |
3887 | case Tag_RISCV_priv_spec_minor: | |
3888 | case Tag_RISCV_priv_spec_revision: | |
dcd709e0 | 3889 | /* If we have handled the privileged elf attributes, then skip it. */ |
cbd7581f | 3890 | if (!priv_attrs_merged) |
41285764 | 3891 | { |
cbd7581f NC |
3892 | unsigned int Tag_a = Tag_RISCV_priv_spec; |
3893 | unsigned int Tag_b = Tag_RISCV_priv_spec_minor; | |
3894 | unsigned int Tag_c = Tag_RISCV_priv_spec_revision; | |
3d73d29e NC |
3895 | enum riscv_spec_class in_priv_spec = PRIV_SPEC_CLASS_NONE; |
3896 | enum riscv_spec_class out_priv_spec = PRIV_SPEC_CLASS_NONE; | |
39ff0b81 | 3897 | |
dcd709e0 | 3898 | /* Get the privileged spec class from elf attributes. */ |
39ff0b81 NC |
3899 | riscv_get_priv_spec_class_from_numbers (in_attr[Tag_a].i, |
3900 | in_attr[Tag_b].i, | |
3901 | in_attr[Tag_c].i, | |
3902 | &in_priv_spec); | |
3903 | riscv_get_priv_spec_class_from_numbers (out_attr[Tag_a].i, | |
3904 | out_attr[Tag_b].i, | |
3905 | out_attr[Tag_c].i, | |
3906 | &out_priv_spec); | |
cbd7581f | 3907 | |
dcd709e0 | 3908 | /* Allow to link the object without the privileged specs. */ |
39ff0b81 | 3909 | if (out_priv_spec == PRIV_SPEC_CLASS_NONE) |
cbd7581f NC |
3910 | { |
3911 | out_attr[Tag_a].i = in_attr[Tag_a].i; | |
3912 | out_attr[Tag_b].i = in_attr[Tag_b].i; | |
3913 | out_attr[Tag_c].i = in_attr[Tag_c].i; | |
3914 | } | |
39ff0b81 NC |
3915 | else if (in_priv_spec != PRIV_SPEC_CLASS_NONE |
3916 | && in_priv_spec != out_priv_spec) | |
cbd7581f NC |
3917 | { |
3918 | _bfd_error_handler | |
b800637e | 3919 | (_("warning: %pB use privileged spec version %u.%u.%u but " |
9184ef8a | 3920 | "the output use version %u.%u.%u"), |
cbd7581f NC |
3921 | ibfd, |
3922 | in_attr[Tag_a].i, | |
3923 | in_attr[Tag_b].i, | |
3924 | in_attr[Tag_c].i, | |
3925 | out_attr[Tag_a].i, | |
3926 | out_attr[Tag_b].i, | |
3927 | out_attr[Tag_c].i); | |
39ff0b81 | 3928 | |
dcd709e0 NC |
3929 | /* The privileged spec v1.9.1 can not be linked with others |
3930 | since the conflicts, so we plan to drop it in a year or | |
3931 | two. */ | |
39ff0b81 NC |
3932 | if (in_priv_spec == PRIV_SPEC_CLASS_1P9P1 |
3933 | || out_priv_spec == PRIV_SPEC_CLASS_1P9P1) | |
3934 | { | |
3935 | _bfd_error_handler | |
b800637e | 3936 | (_("warning: privileged spec version 1.9.1 can not be " |
9184ef8a | 3937 | "linked with other spec versions")); |
39ff0b81 NC |
3938 | } |
3939 | ||
dcd709e0 | 3940 | /* Update the output privileged spec to the newest one. */ |
39ff0b81 NC |
3941 | if (in_priv_spec > out_priv_spec) |
3942 | { | |
3943 | out_attr[Tag_a].i = in_attr[Tag_a].i; | |
3944 | out_attr[Tag_b].i = in_attr[Tag_b].i; | |
3945 | out_attr[Tag_c].i = in_attr[Tag_c].i; | |
3946 | } | |
cbd7581f | 3947 | } |
0a1b45a2 | 3948 | priv_attrs_merged = true; |
7d7a7d7c JW |
3949 | } |
3950 | break; | |
41285764 | 3951 | |
7d7a7d7c JW |
3952 | case Tag_RISCV_unaligned_access: |
3953 | out_attr[i].i |= in_attr[i].i; | |
3954 | break; | |
41285764 | 3955 | |
7d7a7d7c JW |
3956 | case Tag_RISCV_stack_align: |
3957 | if (out_attr[i].i == 0) | |
3958 | out_attr[i].i = in_attr[i].i; | |
3959 | else if (in_attr[i].i != 0 | |
3960 | && out_attr[i].i != 0 | |
3961 | && out_attr[i].i != in_attr[i].i) | |
3962 | { | |
3963 | _bfd_error_handler | |
3964 | (_("error: %pB use %u-byte stack aligned but the output " | |
9184ef8a | 3965 | "use %u-byte stack aligned"), |
7d7a7d7c | 3966 | ibfd, in_attr[i].i, out_attr[i].i); |
0a1b45a2 | 3967 | result = false; |
7d7a7d7c JW |
3968 | } |
3969 | break; | |
41285764 | 3970 | |
7d7a7d7c JW |
3971 | default: |
3972 | result &= _bfd_elf_merge_unknown_attribute_low (ibfd, obfd, i); | |
3973 | } | |
3974 | ||
3975 | /* If out_attr was copied from in_attr then it won't have a type yet. */ | |
3976 | if (in_attr[i].type && !out_attr[i].type) | |
3977 | out_attr[i].type = in_attr[i].type; | |
3978 | } | |
3979 | ||
3980 | /* Merge Tag_compatibility attributes and any common GNU ones. */ | |
3981 | if (!_bfd_elf_merge_object_attributes (ibfd, info)) | |
0a1b45a2 | 3982 | return false; |
7d7a7d7c JW |
3983 | |
3984 | /* Check for any attributes not known on RISC-V. */ | |
3985 | result &= _bfd_elf_merge_unknown_attribute_list (ibfd, obfd); | |
3986 | ||
3987 | return result; | |
3988 | } | |
3989 | ||
e23eba97 NC |
3990 | /* Merge backend specific data from an object file to the output |
3991 | object file when linking. */ | |
3992 | ||
0a1b45a2 | 3993 | static bool |
e23eba97 NC |
3994 | _bfd_riscv_elf_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info) |
3995 | { | |
3996 | bfd *obfd = info->output_bfd; | |
87f98bac | 3997 | flagword new_flags, old_flags; |
e23eba97 NC |
3998 | |
3999 | if (!is_riscv_elf (ibfd) || !is_riscv_elf (obfd)) | |
0a1b45a2 | 4000 | return true; |
e23eba97 NC |
4001 | |
4002 | if (strcmp (bfd_get_target (ibfd), bfd_get_target (obfd)) != 0) | |
4003 | { | |
4004 | (*_bfd_error_handler) | |
871b3ab2 | 4005 | (_("%pB: ABI is incompatible with that of the selected emulation:\n" |
96b0927d PD |
4006 | " target emulation `%s' does not match `%s'"), |
4007 | ibfd, bfd_get_target (ibfd), bfd_get_target (obfd)); | |
0a1b45a2 | 4008 | return false; |
e23eba97 NC |
4009 | } |
4010 | ||
4011 | if (!_bfd_elf_merge_object_attributes (ibfd, info)) | |
0a1b45a2 | 4012 | return false; |
e23eba97 | 4013 | |
7d7a7d7c | 4014 | if (!riscv_merge_attributes (ibfd, info)) |
0a1b45a2 | 4015 | return false; |
7d7a7d7c | 4016 | |
87f98bac JW |
4017 | /* Check to see if the input BFD actually contains any sections. If not, |
4018 | its flags may not have been initialized either, but it cannot actually | |
4019 | cause any incompatibility. Do not short-circuit dynamic objects; their | |
4020 | section list may be emptied by elf_link_add_object_symbols. | |
4021 | ||
4022 | Also check to see if there are no code sections in the input. In this | |
4023 | case, there is no need to check for code specific flags. */ | |
4024 | if (!(ibfd->flags & DYNAMIC)) | |
4025 | { | |
0a1b45a2 AM |
4026 | bool null_input_bfd = true; |
4027 | bool only_data_sections = true; | |
87f98bac JW |
4028 | asection *sec; |
4029 | ||
4030 | for (sec = ibfd->sections; sec != NULL; sec = sec->next) | |
4031 | { | |
0a1b45a2 | 4032 | null_input_bfd = false; |
0d6aab77 | 4033 | |
fd361982 | 4034 | if ((bfd_section_flags (sec) |
87f98bac JW |
4035 | & (SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS)) |
4036 | == (SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS)) | |
0d6aab77 | 4037 | { |
0a1b45a2 | 4038 | only_data_sections = false; |
0d6aab77 NC |
4039 | break; |
4040 | } | |
87f98bac JW |
4041 | } |
4042 | ||
4043 | if (null_input_bfd || only_data_sections) | |
0a1b45a2 | 4044 | return true; |
87f98bac JW |
4045 | } |
4046 | ||
0d6aab77 NC |
4047 | new_flags = elf_elfheader (ibfd)->e_flags; |
4048 | old_flags = elf_elfheader (obfd)->e_flags; | |
4049 | ||
4050 | if (!elf_flags_init (obfd)) | |
4051 | { | |
0a1b45a2 | 4052 | elf_flags_init (obfd) = true; |
0d6aab77 | 4053 | elf_elfheader (obfd)->e_flags = new_flags; |
0a1b45a2 | 4054 | return true; |
0d6aab77 NC |
4055 | } |
4056 | ||
2922d21d AW |
4057 | /* Disallow linking different float ABIs. */ |
4058 | if ((old_flags ^ new_flags) & EF_RISCV_FLOAT_ABI) | |
e23eba97 NC |
4059 | { |
4060 | (*_bfd_error_handler) | |
0242af40 JW |
4061 | (_("%pB: can't link %s modules with %s modules"), ibfd, |
4062 | riscv_float_abi_string (new_flags), | |
4063 | riscv_float_abi_string (old_flags)); | |
e23eba97 NC |
4064 | goto fail; |
4065 | } | |
4066 | ||
7f999549 JW |
4067 | /* Disallow linking RVE and non-RVE. */ |
4068 | if ((old_flags ^ new_flags) & EF_RISCV_RVE) | |
4069 | { | |
4070 | (*_bfd_error_handler) | |
4071 | (_("%pB: can't link RVE with other target"), ibfd); | |
4072 | goto fail; | |
4073 | } | |
4074 | ||
e23eba97 NC |
4075 | /* Allow linking RVC and non-RVC, and keep the RVC flag. */ |
4076 | elf_elfheader (obfd)->e_flags |= new_flags & EF_RISCV_RVC; | |
4077 | ||
96462b01 S |
4078 | /* Allow linking TSO and non-TSO, and keep the TSO flag. */ |
4079 | elf_elfheader (obfd)->e_flags |= new_flags & EF_RISCV_TSO; | |
4080 | ||
0a1b45a2 | 4081 | return true; |
e23eba97 | 4082 | |
dc1e8a47 | 4083 | fail: |
e23eba97 | 4084 | bfd_set_error (bfd_error_bad_value); |
0a1b45a2 | 4085 | return false; |
e23eba97 NC |
4086 | } |
4087 | ||
9d06997a PD |
4088 | /* A second format for recording PC-relative hi relocations. This stores the |
4089 | information required to relax them to GP-relative addresses. */ | |
4090 | ||
4091 | typedef struct riscv_pcgp_hi_reloc riscv_pcgp_hi_reloc; | |
4092 | struct riscv_pcgp_hi_reloc | |
4093 | { | |
4094 | bfd_vma hi_sec_off; | |
4095 | bfd_vma hi_addend; | |
4096 | bfd_vma hi_addr; | |
4097 | unsigned hi_sym; | |
4098 | asection *sym_sec; | |
0a1b45a2 | 4099 | bool undefined_weak; |
9d06997a PD |
4100 | riscv_pcgp_hi_reloc *next; |
4101 | }; | |
4102 | ||
4103 | typedef struct riscv_pcgp_lo_reloc riscv_pcgp_lo_reloc; | |
4104 | struct riscv_pcgp_lo_reloc | |
4105 | { | |
4106 | bfd_vma hi_sec_off; | |
4107 | riscv_pcgp_lo_reloc *next; | |
4108 | }; | |
4109 | ||
4110 | typedef struct | |
4111 | { | |
4112 | riscv_pcgp_hi_reloc *hi; | |
4113 | riscv_pcgp_lo_reloc *lo; | |
4114 | } riscv_pcgp_relocs; | |
4115 | ||
5f9aecea JW |
4116 | /* Initialize the pcgp reloc info in P. */ |
4117 | ||
0a1b45a2 | 4118 | static bool |
9d06997a PD |
4119 | riscv_init_pcgp_relocs (riscv_pcgp_relocs *p) |
4120 | { | |
4121 | p->hi = NULL; | |
4122 | p->lo = NULL; | |
0a1b45a2 | 4123 | return true; |
9d06997a PD |
4124 | } |
4125 | ||
5f9aecea JW |
4126 | /* Free the pcgp reloc info in P. */ |
4127 | ||
9d06997a PD |
4128 | static void |
4129 | riscv_free_pcgp_relocs (riscv_pcgp_relocs *p, | |
4130 | bfd *abfd ATTRIBUTE_UNUSED, | |
4131 | asection *sec ATTRIBUTE_UNUSED) | |
4132 | { | |
4133 | riscv_pcgp_hi_reloc *c; | |
4134 | riscv_pcgp_lo_reloc *l; | |
4135 | ||
1942a048 | 4136 | for (c = p->hi; c != NULL; ) |
9d06997a PD |
4137 | { |
4138 | riscv_pcgp_hi_reloc *next = c->next; | |
4139 | free (c); | |
4140 | c = next; | |
4141 | } | |
4142 | ||
1942a048 | 4143 | for (l = p->lo; l != NULL; ) |
9d06997a PD |
4144 | { |
4145 | riscv_pcgp_lo_reloc *next = l->next; | |
4146 | free (l); | |
4147 | l = next; | |
4148 | } | |
4149 | } | |
4150 | ||
5f9aecea JW |
4151 | /* Record pcgp hi part reloc info in P, using HI_SEC_OFF as the lookup index. |
4152 | The HI_ADDEND, HI_ADDR, HI_SYM, and SYM_SEC args contain info required to | |
4153 | relax the corresponding lo part reloc. */ | |
4154 | ||
0a1b45a2 | 4155 | static bool |
9d06997a PD |
4156 | riscv_record_pcgp_hi_reloc (riscv_pcgp_relocs *p, bfd_vma hi_sec_off, |
4157 | bfd_vma hi_addend, bfd_vma hi_addr, | |
9d1da81b | 4158 | unsigned hi_sym, asection *sym_sec, |
0a1b45a2 | 4159 | bool undefined_weak) |
9d06997a | 4160 | { |
1942a048 | 4161 | riscv_pcgp_hi_reloc *new = bfd_malloc (sizeof (*new)); |
9d06997a | 4162 | if (!new) |
0a1b45a2 | 4163 | return false; |
9d06997a PD |
4164 | new->hi_sec_off = hi_sec_off; |
4165 | new->hi_addend = hi_addend; | |
4166 | new->hi_addr = hi_addr; | |
4167 | new->hi_sym = hi_sym; | |
4168 | new->sym_sec = sym_sec; | |
9d1da81b | 4169 | new->undefined_weak = undefined_weak; |
9d06997a PD |
4170 | new->next = p->hi; |
4171 | p->hi = new; | |
0a1b45a2 | 4172 | return true; |
9d06997a PD |
4173 | } |
4174 | ||
5f9aecea JW |
4175 | /* Look up hi part pcgp reloc info in P, using HI_SEC_OFF as the lookup index. |
4176 | This is used by a lo part reloc to find the corresponding hi part reloc. */ | |
4177 | ||
9d06997a | 4178 | static riscv_pcgp_hi_reloc * |
1942a048 | 4179 | riscv_find_pcgp_hi_reloc (riscv_pcgp_relocs *p, bfd_vma hi_sec_off) |
9d06997a PD |
4180 | { |
4181 | riscv_pcgp_hi_reloc *c; | |
4182 | ||
4183 | for (c = p->hi; c != NULL; c = c->next) | |
4184 | if (c->hi_sec_off == hi_sec_off) | |
4185 | return c; | |
4186 | return NULL; | |
4187 | } | |
4188 | ||
5f9aecea JW |
4189 | /* Record pcgp lo part reloc info in P, using HI_SEC_OFF as the lookup info. |
4190 | This is used to record relocs that can't be relaxed. */ | |
9d06997a | 4191 | |
0a1b45a2 | 4192 | static bool |
9d06997a PD |
4193 | riscv_record_pcgp_lo_reloc (riscv_pcgp_relocs *p, bfd_vma hi_sec_off) |
4194 | { | |
1942a048 | 4195 | riscv_pcgp_lo_reloc *new = bfd_malloc (sizeof (*new)); |
9d06997a | 4196 | if (!new) |
0a1b45a2 | 4197 | return false; |
9d06997a PD |
4198 | new->hi_sec_off = hi_sec_off; |
4199 | new->next = p->lo; | |
4200 | p->lo = new; | |
0a1b45a2 | 4201 | return true; |
9d06997a PD |
4202 | } |
4203 | ||
5f9aecea JW |
4204 | /* Look up lo part pcgp reloc info in P, using HI_SEC_OFF as the lookup index. |
4205 | This is used by a hi part reloc to find the corresponding lo part reloc. */ | |
4206 | ||
0a1b45a2 | 4207 | static bool |
9d06997a PD |
4208 | riscv_find_pcgp_lo_reloc (riscv_pcgp_relocs *p, bfd_vma hi_sec_off) |
4209 | { | |
4210 | riscv_pcgp_lo_reloc *c; | |
4211 | ||
4212 | for (c = p->lo; c != NULL; c = c->next) | |
4213 | if (c->hi_sec_off == hi_sec_off) | |
0a1b45a2 AM |
4214 | return true; |
4215 | return false; | |
9d06997a PD |
4216 | } |
4217 | ||
9abcdc10 LR |
4218 | static void |
4219 | riscv_update_pcgp_relocs (riscv_pcgp_relocs *p, asection *deleted_sec, | |
4220 | bfd_vma deleted_addr, size_t deleted_count) | |
4221 | { | |
4222 | /* Bytes have already been deleted and toaddr should match the old section | |
4223 | size for our checks, so adjust it here. */ | |
4224 | bfd_vma toaddr = deleted_sec->size + deleted_count; | |
4225 | riscv_pcgp_lo_reloc *l; | |
4226 | riscv_pcgp_hi_reloc *h; | |
4227 | ||
4228 | /* Update section offsets of corresponding pcrel_hi relocs for the pcrel_lo | |
4229 | entries where they occur after the deleted bytes. */ | |
4230 | for (l = p->lo; l != NULL; l = l->next) | |
4231 | if (l->hi_sec_off > deleted_addr | |
4232 | && l->hi_sec_off < toaddr) | |
4233 | l->hi_sec_off -= deleted_count; | |
4234 | ||
4235 | /* Update both section offsets, and symbol values of pcrel_hi relocs where | |
4236 | these values occur after the deleted bytes. */ | |
4237 | for (h = p->hi; h != NULL; h = h->next) | |
4238 | { | |
4239 | if (h->hi_sec_off > deleted_addr | |
4240 | && h->hi_sec_off < toaddr) | |
4241 | h->hi_sec_off -= deleted_count; | |
4242 | if (h->sym_sec == deleted_sec | |
4243 | && h->hi_addr > deleted_addr | |
4244 | && h->hi_addr < toaddr) | |
4245 | h->hi_addr -= deleted_count; | |
4246 | } | |
4247 | } | |
4248 | ||
43025f01 | 4249 | /* Delete some bytes, adjust relcocations and symbol table from a section. */ |
9abcdc10 LR |
4250 | |
4251 | static bool | |
43025f01 PN |
4252 | _riscv_relax_delete_bytes (bfd *abfd, |
4253 | asection *sec, | |
4254 | bfd_vma addr, | |
4255 | size_t count, | |
4256 | struct bfd_link_info *link_info, | |
4257 | riscv_pcgp_relocs *p, | |
4258 | bfd_vma delete_total, | |
4259 | bfd_vma toaddr) | |
9abcdc10 LR |
4260 | { |
4261 | unsigned int i, symcount; | |
9abcdc10 LR |
4262 | struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (abfd); |
4263 | Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
4264 | unsigned int sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); | |
4265 | struct bfd_elf_section_data *data = elf_section_data (sec); | |
4266 | bfd_byte *contents = data->this_hdr.contents; | |
43025f01 | 4267 | size_t bytes_to_move = toaddr - addr - count; |
9abcdc10 LR |
4268 | |
4269 | /* Actually delete the bytes. */ | |
4270 | sec->size -= count; | |
43025f01 PN |
4271 | memmove (contents + addr, contents + addr + count + delete_total, bytes_to_move); |
4272 | ||
4273 | /* Still adjust relocations and symbols in non-linear times. */ | |
4274 | toaddr = sec->size + count; | |
9abcdc10 LR |
4275 | |
4276 | /* Adjust the location of all of the relocs. Note that we need not | |
4277 | adjust the addends, since all PC-relative references must be against | |
4278 | symbols, which we will adjust below. */ | |
4279 | for (i = 0; i < sec->reloc_count; i++) | |
4280 | if (data->relocs[i].r_offset > addr && data->relocs[i].r_offset < toaddr) | |
4281 | data->relocs[i].r_offset -= count; | |
4282 | ||
4283 | /* Adjust the hi_sec_off, and the hi_addr of any entries in the pcgp relocs | |
4284 | table for which these values occur after the deleted bytes. */ | |
4285 | if (p) | |
4286 | riscv_update_pcgp_relocs (p, sec, addr, count); | |
4287 | ||
4288 | /* Adjust the local symbols defined in this section. */ | |
4289 | for (i = 0; i < symtab_hdr->sh_info; i++) | |
4290 | { | |
4291 | Elf_Internal_Sym *sym = (Elf_Internal_Sym *) symtab_hdr->contents + i; | |
4292 | if (sym->st_shndx == sec_shndx) | |
4293 | { | |
4294 | /* If the symbol is in the range of memory we just moved, we | |
4295 | have to adjust its value. */ | |
4296 | if (sym->st_value > addr && sym->st_value <= toaddr) | |
4297 | sym->st_value -= count; | |
4298 | ||
4299 | /* If the symbol *spans* the bytes we just deleted (i.e. its | |
4300 | *end* is in the moved bytes but its *start* isn't), then we | |
4301 | must adjust its size. | |
4302 | ||
4303 | This test needs to use the original value of st_value, otherwise | |
4304 | we might accidentally decrease size when deleting bytes right | |
4305 | before the symbol. But since deleted relocs can't span across | |
4306 | symbols, we can't have both a st_value and a st_size decrease, | |
4307 | so it is simpler to just use an else. */ | |
4308 | else if (sym->st_value <= addr | |
4309 | && sym->st_value + sym->st_size > addr | |
4310 | && sym->st_value + sym->st_size <= toaddr) | |
4311 | sym->st_size -= count; | |
4312 | } | |
4313 | } | |
4314 | ||
4315 | /* Now adjust the global symbols defined in this section. */ | |
4316 | symcount = ((symtab_hdr->sh_size / sizeof (ElfNN_External_Sym)) | |
4317 | - symtab_hdr->sh_info); | |
4318 | ||
4319 | for (i = 0; i < symcount; i++) | |
4320 | { | |
4321 | struct elf_link_hash_entry *sym_hash = sym_hashes[i]; | |
4322 | ||
4323 | /* The '--wrap SYMBOL' option is causing a pain when the object file, | |
4324 | containing the definition of __wrap_SYMBOL, includes a direct | |
4325 | call to SYMBOL as well. Since both __wrap_SYMBOL and SYMBOL reference | |
4326 | the same symbol (which is __wrap_SYMBOL), but still exist as two | |
4327 | different symbols in 'sym_hashes', we don't want to adjust | |
4328 | the global symbol __wrap_SYMBOL twice. | |
4329 | ||
4330 | The same problem occurs with symbols that are versioned_hidden, as | |
4331 | foo becomes an alias for foo@BAR, and hence they need the same | |
4332 | treatment. */ | |
4333 | if (link_info->wrap_hash != NULL | |
4334 | || sym_hash->versioned != unversioned) | |
4335 | { | |
4336 | struct elf_link_hash_entry **cur_sym_hashes; | |
4337 | ||
4338 | /* Loop only over the symbols which have already been checked. */ | |
4339 | for (cur_sym_hashes = sym_hashes; cur_sym_hashes < &sym_hashes[i]; | |
4340 | cur_sym_hashes++) | |
4341 | { | |
4342 | /* If the current symbol is identical to 'sym_hash', that means | |
4343 | the symbol was already adjusted (or at least checked). */ | |
4344 | if (*cur_sym_hashes == sym_hash) | |
4345 | break; | |
4346 | } | |
4347 | /* Don't adjust the symbol again. */ | |
4348 | if (cur_sym_hashes < &sym_hashes[i]) | |
4349 | continue; | |
4350 | } | |
4351 | ||
4352 | if ((sym_hash->root.type == bfd_link_hash_defined | |
4353 | || sym_hash->root.type == bfd_link_hash_defweak) | |
4354 | && sym_hash->root.u.def.section == sec) | |
4355 | { | |
4356 | /* As above, adjust the value if needed. */ | |
4357 | if (sym_hash->root.u.def.value > addr | |
4358 | && sym_hash->root.u.def.value <= toaddr) | |
4359 | sym_hash->root.u.def.value -= count; | |
4360 | ||
4361 | /* As above, adjust the size if needed. */ | |
4362 | else if (sym_hash->root.u.def.value <= addr | |
4363 | && sym_hash->root.u.def.value + sym_hash->size > addr | |
4364 | && sym_hash->root.u.def.value + sym_hash->size <= toaddr) | |
4365 | sym_hash->size -= count; | |
4366 | } | |
4367 | } | |
4368 | ||
4369 | return true; | |
4370 | } | |
4371 | ||
43025f01 PN |
4372 | typedef bool (*relax_delete_t) (bfd *, asection *, |
4373 | bfd_vma, size_t, | |
4374 | struct bfd_link_info *, | |
4375 | riscv_pcgp_relocs *, | |
4376 | Elf_Internal_Rela *); | |
4377 | ||
4378 | static relax_delete_t riscv_relax_delete_bytes; | |
4379 | ||
4380 | /* Do not delete some bytes from a section while relaxing. | |
4381 | Just mark the deleted bytes as R_RISCV_DELETE. */ | |
4382 | ||
4383 | static bool | |
4384 | _riscv_relax_delete_piecewise (bfd *abfd ATTRIBUTE_UNUSED, | |
4385 | asection *sec ATTRIBUTE_UNUSED, | |
4386 | bfd_vma addr, | |
4387 | size_t count, | |
4388 | struct bfd_link_info *link_info ATTRIBUTE_UNUSED, | |
4389 | riscv_pcgp_relocs *p ATTRIBUTE_UNUSED, | |
4390 | Elf_Internal_Rela *rel) | |
4391 | { | |
4392 | if (rel == NULL) | |
4393 | return false; | |
4394 | rel->r_info = ELFNN_R_INFO (0, R_RISCV_DELETE); | |
4395 | rel->r_offset = addr; | |
4396 | rel->r_addend = count; | |
4397 | return true; | |
4398 | } | |
4399 | ||
4400 | /* Delete some bytes from a section while relaxing. */ | |
4401 | ||
4402 | static bool | |
4403 | _riscv_relax_delete_immediate (bfd *abfd, | |
4404 | asection *sec, | |
4405 | bfd_vma addr, | |
4406 | size_t count, | |
4407 | struct bfd_link_info *link_info, | |
4408 | riscv_pcgp_relocs *p, | |
4409 | Elf_Internal_Rela *rel) | |
4410 | { | |
4411 | if (rel != NULL) | |
4412 | rel->r_info = ELFNN_R_INFO (0, R_RISCV_NONE); | |
4413 | return _riscv_relax_delete_bytes (abfd, sec, addr, count, | |
4414 | link_info, p, 0, sec->size); | |
4415 | } | |
4416 | ||
4417 | /* Delete the bytes for R_RISCV_DELETE relocs. */ | |
4418 | ||
4419 | static bool | |
4420 | riscv_relax_resolve_delete_relocs (bfd *abfd, | |
4421 | asection *sec, | |
4422 | struct bfd_link_info *link_info, | |
4423 | Elf_Internal_Rela *relocs) | |
4424 | { | |
4425 | bfd_vma delete_total = 0; | |
4426 | unsigned int i; | |
4427 | ||
4428 | for (i = 0; i < sec->reloc_count; i++) | |
4429 | { | |
4430 | Elf_Internal_Rela *rel = relocs + i; | |
4431 | if (ELFNN_R_TYPE (rel->r_info) != R_RISCV_DELETE) | |
4432 | continue; | |
4433 | ||
4434 | /* Find the next R_RISCV_DELETE reloc if possible. */ | |
4435 | Elf_Internal_Rela *rel_next = NULL; | |
4436 | unsigned int start = rel - relocs; | |
4437 | for (i = start; i < sec->reloc_count; i++) | |
4438 | { | |
4439 | /* Since we only replace existing relocs and don't add new relocs, the | |
4440 | relocs are in sequential order. We can skip the relocs prior to this | |
4441 | one, making this search linear time. */ | |
4442 | rel_next = relocs + i; | |
4443 | if (ELFNN_R_TYPE ((rel_next)->r_info) == R_RISCV_DELETE | |
4444 | && (rel_next)->r_offset > rel->r_offset) | |
f52fb009 NC |
4445 | { |
4446 | BFD_ASSERT (rel_next - rel > 0); | |
4447 | break; | |
4448 | } | |
43025f01 PN |
4449 | else |
4450 | rel_next = NULL; | |
4451 | } | |
4452 | ||
4453 | bfd_vma toaddr = rel_next == NULL ? sec->size : rel_next->r_offset; | |
4454 | if (!_riscv_relax_delete_bytes (abfd, sec, rel->r_offset, rel->r_addend, | |
4455 | link_info, NULL, delete_total, toaddr)) | |
4456 | return false; | |
4457 | ||
4458 | delete_total += rel->r_addend; | |
4459 | rel->r_info = ELFNN_R_INFO (0, R_RISCV_NONE); | |
4460 | ||
4461 | /* Skip ahead to the next delete reloc. */ | |
f52fb009 NC |
4462 | i = rel_next != NULL ? (unsigned int) (rel_next - relocs - 1) |
4463 | : sec->reloc_count; | |
43025f01 PN |
4464 | } |
4465 | ||
4466 | return true; | |
4467 | } | |
4468 | ||
0a1b45a2 AM |
4469 | typedef bool (*relax_func_t) (bfd *, asection *, asection *, |
4470 | struct bfd_link_info *, | |
4471 | Elf_Internal_Rela *, | |
4472 | bfd_vma, bfd_vma, bfd_vma, bool *, | |
4473 | riscv_pcgp_relocs *, | |
4474 | bool undefined_weak); | |
45f76423 | 4475 | |
e23eba97 NC |
4476 | /* Relax AUIPC + JALR into JAL. */ |
4477 | ||
0a1b45a2 | 4478 | static bool |
e23eba97 NC |
4479 | _bfd_riscv_relax_call (bfd *abfd, asection *sec, asection *sym_sec, |
4480 | struct bfd_link_info *link_info, | |
4481 | Elf_Internal_Rela *rel, | |
4482 | bfd_vma symval, | |
45f76423 AW |
4483 | bfd_vma max_alignment, |
4484 | bfd_vma reserve_size ATTRIBUTE_UNUSED, | |
0a1b45a2 | 4485 | bool *again, |
9abcdc10 | 4486 | riscv_pcgp_relocs *pcgp_relocs, |
0a1b45a2 | 4487 | bool undefined_weak ATTRIBUTE_UNUSED) |
e23eba97 NC |
4488 | { |
4489 | bfd_byte *contents = elf_section_data (sec)->this_hdr.contents; | |
1174d920 | 4490 | bfd_vma foff = symval - (sec_addr (sec) + rel->r_offset); |
0a1b45a2 | 4491 | bool near_zero = (symval + RISCV_IMM_REACH / 2) < RISCV_IMM_REACH; |
e23eba97 NC |
4492 | bfd_vma auipc, jalr; |
4493 | int rd, r_type, len = 4, rvc = elf_elfheader (abfd)->e_flags & EF_RISCV_RVC; | |
4494 | ||
4495 | /* If the call crosses section boundaries, an alignment directive could | |
c6261a00 JW |
4496 | cause the PC-relative offset to later increase, so we need to add in the |
4497 | max alignment of any section inclusive from the call to the target. | |
4498 | Otherwise, we only need to use the alignment of the current section. */ | |
5a9f5403 | 4499 | if (VALID_JTYPE_IMM (foff)) |
c6261a00 JW |
4500 | { |
4501 | if (sym_sec->output_section == sec->output_section | |
4502 | && sym_sec->output_section != bfd_abs_section_ptr) | |
4503 | max_alignment = (bfd_vma) 1 << sym_sec->output_section->alignment_power; | |
1174d920 | 4504 | foff += ((bfd_signed_vma) foff < 0 ? -max_alignment : max_alignment); |
c6261a00 | 4505 | } |
e23eba97 NC |
4506 | |
4507 | /* See if this function call can be shortened. */ | |
5a9f5403 | 4508 | if (!VALID_JTYPE_IMM (foff) && !(!bfd_link_pic (link_info) && near_zero)) |
0a1b45a2 | 4509 | return true; |
e23eba97 NC |
4510 | |
4511 | /* Shorten the function call. */ | |
4512 | BFD_ASSERT (rel->r_offset + 8 <= sec->size); | |
4513 | ||
fbc09e7a MC |
4514 | auipc = bfd_getl32 (contents + rel->r_offset); |
4515 | jalr = bfd_getl32 (contents + rel->r_offset + 4); | |
e23eba97 | 4516 | rd = (jalr >> OP_SH_RD) & OP_MASK_RD; |
5a9f5403 | 4517 | rvc = rvc && VALID_CJTYPE_IMM (foff); |
e23eba97 | 4518 | |
ae2b14c7 JW |
4519 | /* C.J exists on RV32 and RV64, but C.JAL is RV32-only. */ |
4520 | rvc = rvc && (rd == 0 || (rd == X_RA && ARCH_SIZE == 32)); | |
4521 | ||
4522 | if (rvc) | |
e23eba97 NC |
4523 | { |
4524 | /* Relax to C.J[AL] rd, addr. */ | |
4525 | r_type = R_RISCV_RVC_JUMP; | |
4526 | auipc = rd == 0 ? MATCH_C_J : MATCH_C_JAL; | |
4527 | len = 2; | |
4528 | } | |
5a9f5403 | 4529 | else if (VALID_JTYPE_IMM (foff)) |
e23eba97 NC |
4530 | { |
4531 | /* Relax to JAL rd, addr. */ | |
4532 | r_type = R_RISCV_JAL; | |
4533 | auipc = MATCH_JAL | (rd << OP_SH_RD); | |
4534 | } | |
dcd709e0 | 4535 | else |
e23eba97 | 4536 | { |
dcd709e0 | 4537 | /* Near zero, relax to JALR rd, x0, addr. */ |
e23eba97 NC |
4538 | r_type = R_RISCV_LO12_I; |
4539 | auipc = MATCH_JALR | (rd << OP_SH_RD); | |
4540 | } | |
4541 | ||
4542 | /* Replace the R_RISCV_CALL reloc. */ | |
4543 | rel->r_info = ELFNN_R_INFO (ELFNN_R_SYM (rel->r_info), r_type); | |
4544 | /* Replace the AUIPC. */ | |
fbc09e7a | 4545 | riscv_put_insn (8 * len, auipc, contents + rel->r_offset); |
e23eba97 | 4546 | |
43025f01 | 4547 | /* Delete unnecessary JALR and reuse the R_RISCV_RELAX reloc. */ |
0a1b45a2 | 4548 | *again = true; |
7f02625e | 4549 | return riscv_relax_delete_bytes (abfd, sec, rel->r_offset + len, 8 - len, |
43025f01 | 4550 | link_info, pcgp_relocs, rel + 1); |
e23eba97 NC |
4551 | } |
4552 | ||
0699f2d7 LX |
4553 | /* Traverse all output sections and return the max alignment. |
4554 | ||
4555 | If gp is zero, then all the output section alignments are | |
4556 | possible candidates; Otherwise, only the output sections | |
4557 | which are in the [gp-2K, gp+2K) range need to be considered. */ | |
e23eba97 | 4558 | |
1d61f794 | 4559 | static bfd_vma |
0699f2d7 | 4560 | _bfd_riscv_get_max_alignment (asection *sec, bfd_vma gp) |
e23eba97 NC |
4561 | { |
4562 | unsigned int max_alignment_power = 0; | |
4563 | asection *o; | |
4564 | ||
4565 | for (o = sec->output_section->owner->sections; o != NULL; o = o->next) | |
4566 | { | |
0699f2d7 LX |
4567 | bool valid = true; |
4568 | if (gp | |
4569 | && !(VALID_ITYPE_IMM (sec_addr (o) - gp) | |
4570 | || VALID_ITYPE_IMM (sec_addr (o) + o->size - gp))) | |
4571 | valid = false; | |
4572 | ||
4573 | if (valid && o->alignment_power > max_alignment_power) | |
e23eba97 NC |
4574 | max_alignment_power = o->alignment_power; |
4575 | } | |
4576 | ||
1d61f794 | 4577 | return (bfd_vma) 1 << max_alignment_power; |
e23eba97 NC |
4578 | } |
4579 | ||
dcd709e0 | 4580 | /* Relax non-PIC global variable references to GP-relative references. */ |
e23eba97 | 4581 | |
0a1b45a2 | 4582 | static bool |
e23eba97 NC |
4583 | _bfd_riscv_relax_lui (bfd *abfd, |
4584 | asection *sec, | |
4585 | asection *sym_sec, | |
4586 | struct bfd_link_info *link_info, | |
4587 | Elf_Internal_Rela *rel, | |
4588 | bfd_vma symval, | |
45f76423 AW |
4589 | bfd_vma max_alignment, |
4590 | bfd_vma reserve_size, | |
0a1b45a2 | 4591 | bool *again, |
9abcdc10 | 4592 | riscv_pcgp_relocs *pcgp_relocs, |
0a1b45a2 | 4593 | bool undefined_weak) |
e23eba97 | 4594 | { |
0699f2d7 | 4595 | struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (link_info); |
e23eba97 | 4596 | bfd_byte *contents = elf_section_data (sec)->this_hdr.contents; |
03e63766 | 4597 | /* Can relax to x0 even when gp relaxation is disabled. */ |
0699f2d7 LX |
4598 | bfd_vma gp = htab->params->relax_gp |
4599 | ? riscv_global_pointer_value (link_info) | |
4600 | : 0; | |
e23eba97 NC |
4601 | int use_rvc = elf_elfheader (abfd)->e_flags & EF_RISCV_RVC; |
4602 | ||
e23eba97 NC |
4603 | BFD_ASSERT (rel->r_offset + 4 <= sec->size); |
4604 | ||
0699f2d7 | 4605 | if (!undefined_weak && gp) |
d0f744f9 | 4606 | { |
507685a3 JW |
4607 | /* If gp and the symbol are in the same output section, which is not the |
4608 | abs section, then consider only that output section's alignment. */ | |
d0f744f9 | 4609 | struct bfd_link_hash_entry *h = |
0a1b45a2 AM |
4610 | bfd_link_hash_lookup (link_info->hash, RISCV_GP_SYMBOL, false, false, |
4611 | true); | |
507685a3 JW |
4612 | if (h->u.def.section->output_section == sym_sec->output_section |
4613 | && sym_sec->output_section != bfd_abs_section_ptr) | |
d0f744f9 | 4614 | max_alignment = (bfd_vma) 1 << sym_sec->output_section->alignment_power; |
0699f2d7 LX |
4615 | else |
4616 | { | |
4617 | /* Consider output section alignments which are in [gp-2K, gp+2K). */ | |
4618 | max_alignment = htab->max_alignment_for_gp; | |
4619 | if (max_alignment == (bfd_vma) -1) | |
4620 | { | |
4621 | max_alignment = _bfd_riscv_get_max_alignment (sec, gp); | |
4622 | htab->max_alignment_for_gp = max_alignment; | |
4623 | } | |
4624 | } | |
d0f744f9 AW |
4625 | } |
4626 | ||
e23eba97 | 4627 | /* Is the reference in range of x0 or gp? |
0699f2d7 LX |
4628 | Valid gp range conservatively because of alignment issue. |
4629 | ||
4630 | Should we also consider the alignment issue for x0 base? */ | |
9d1da81b | 4631 | if (undefined_weak |
0699f2d7 LX |
4632 | || VALID_ITYPE_IMM (symval) |
4633 | || (symval >= gp | |
4634 | && VALID_ITYPE_IMM (symval - gp + max_alignment + reserve_size)) | |
4635 | || (symval < gp | |
4636 | && VALID_ITYPE_IMM (symval - gp - max_alignment - reserve_size))) | |
e23eba97 NC |
4637 | { |
4638 | unsigned sym = ELFNN_R_SYM (rel->r_info); | |
4639 | switch (ELFNN_R_TYPE (rel->r_info)) | |
4640 | { | |
4641 | case R_RISCV_LO12_I: | |
a48ddc3b | 4642 | rel->r_info = ELFNN_R_INFO (sym, R_RISCV_GPREL_I); |
0a1b45a2 | 4643 | return true; |
e23eba97 NC |
4644 | |
4645 | case R_RISCV_LO12_S: | |
a48ddc3b | 4646 | rel->r_info = ELFNN_R_INFO (sym, R_RISCV_GPREL_S); |
0a1b45a2 | 4647 | return true; |
e23eba97 NC |
4648 | |
4649 | case R_RISCV_HI20: | |
43025f01 | 4650 | /* Delete unnecessary LUI and reuse the reloc. */ |
0a1b45a2 | 4651 | *again = true; |
7f02625e | 4652 | return riscv_relax_delete_bytes (abfd, sec, rel->r_offset, 4, |
43025f01 | 4653 | link_info, pcgp_relocs, rel); |
e23eba97 NC |
4654 | |
4655 | default: | |
4656 | abort (); | |
4657 | } | |
4658 | } | |
4659 | ||
4660 | /* Can we relax LUI to C.LUI? Alignment might move the section forward; | |
0f52d45a JW |
4661 | account for this assuming page alignment at worst. In the presence of |
4662 | RELRO segment the linker aligns it by one page size, therefore sections | |
4663 | after the segment can be moved more than one page. */ | |
4664 | ||
e23eba97 NC |
4665 | if (use_rvc |
4666 | && ELFNN_R_TYPE (rel->r_info) == R_RISCV_HI20 | |
5a9f5403 NC |
4667 | && VALID_CITYPE_LUI_IMM (RISCV_CONST_HIGH_PART (symval)) |
4668 | && VALID_CITYPE_LUI_IMM (RISCV_CONST_HIGH_PART (symval) | |
0f52d45a JW |
4669 | + (link_info->relro ? 2 * ELF_MAXPAGESIZE |
4670 | : ELF_MAXPAGESIZE))) | |
e23eba97 | 4671 | { |
3342be5d | 4672 | /* Replace LUI with C.LUI if legal (i.e., rd != x0 and rd != x2/sp). */ |
fbc09e7a | 4673 | bfd_vma lui = bfd_getl32 (contents + rel->r_offset); |
3342be5d AW |
4674 | unsigned rd = ((unsigned)lui >> OP_SH_RD) & OP_MASK_RD; |
4675 | if (rd == 0 || rd == X_SP) | |
0a1b45a2 | 4676 | return true; |
e23eba97 NC |
4677 | |
4678 | lui = (lui & (OP_MASK_RD << OP_SH_RD)) | MATCH_C_LUI; | |
fbc09e7a | 4679 | bfd_putl32 (lui, contents + rel->r_offset); |
e23eba97 NC |
4680 | |
4681 | /* Replace the R_RISCV_HI20 reloc. */ | |
4682 | rel->r_info = ELFNN_R_INFO (ELFNN_R_SYM (rel->r_info), R_RISCV_RVC_LUI); | |
4683 | ||
43025f01 | 4684 | /* Delete extra bytes and reuse the R_RISCV_RELAX reloc. */ |
0a1b45a2 | 4685 | *again = true; |
7f02625e | 4686 | return riscv_relax_delete_bytes (abfd, sec, rel->r_offset + 2, 2, |
43025f01 | 4687 | link_info, pcgp_relocs, rel + 1); |
e23eba97 NC |
4688 | } |
4689 | ||
0a1b45a2 | 4690 | return true; |
e23eba97 NC |
4691 | } |
4692 | ||
dcd709e0 | 4693 | /* Relax non-PIC TLS references to TP-relative references. */ |
e23eba97 | 4694 | |
0a1b45a2 | 4695 | static bool |
e23eba97 NC |
4696 | _bfd_riscv_relax_tls_le (bfd *abfd, |
4697 | asection *sec, | |
4698 | asection *sym_sec ATTRIBUTE_UNUSED, | |
4699 | struct bfd_link_info *link_info, | |
4700 | Elf_Internal_Rela *rel, | |
4701 | bfd_vma symval, | |
45f76423 AW |
4702 | bfd_vma max_alignment ATTRIBUTE_UNUSED, |
4703 | bfd_vma reserve_size ATTRIBUTE_UNUSED, | |
0a1b45a2 | 4704 | bool *again, |
9abcdc10 | 4705 | riscv_pcgp_relocs *pcgp_relocs, |
0a1b45a2 | 4706 | bool undefined_weak ATTRIBUTE_UNUSED) |
e23eba97 NC |
4707 | { |
4708 | /* See if this symbol is in range of tp. */ | |
4709 | if (RISCV_CONST_HIGH_PART (tpoff (link_info, symval)) != 0) | |
0a1b45a2 | 4710 | return true; |
e23eba97 | 4711 | |
e23eba97 | 4712 | BFD_ASSERT (rel->r_offset + 4 <= sec->size); |
45f76423 AW |
4713 | switch (ELFNN_R_TYPE (rel->r_info)) |
4714 | { | |
4715 | case R_RISCV_TPREL_LO12_I: | |
4716 | rel->r_info = ELFNN_R_INFO (ELFNN_R_SYM (rel->r_info), R_RISCV_TPREL_I); | |
0a1b45a2 | 4717 | return true; |
e23eba97 | 4718 | |
45f76423 AW |
4719 | case R_RISCV_TPREL_LO12_S: |
4720 | rel->r_info = ELFNN_R_INFO (ELFNN_R_SYM (rel->r_info), R_RISCV_TPREL_S); | |
0a1b45a2 | 4721 | return true; |
45f76423 AW |
4722 | |
4723 | case R_RISCV_TPREL_HI20: | |
4724 | case R_RISCV_TPREL_ADD: | |
43025f01 | 4725 | /* Delete unnecessary instruction and reuse the reloc. */ |
0a1b45a2 | 4726 | *again = true; |
9abcdc10 | 4727 | return riscv_relax_delete_bytes (abfd, sec, rel->r_offset, 4, link_info, |
43025f01 | 4728 | pcgp_relocs, rel); |
45f76423 AW |
4729 | |
4730 | default: | |
4731 | abort (); | |
4732 | } | |
e23eba97 NC |
4733 | } |
4734 | ||
ebdcad3f NC |
4735 | /* Implement R_RISCV_ALIGN by deleting excess alignment NOPs. |
4736 | Once we've handled an R_RISCV_ALIGN, we can't relax anything else. */ | |
e23eba97 | 4737 | |
0a1b45a2 | 4738 | static bool |
e23eba97 | 4739 | _bfd_riscv_relax_align (bfd *abfd, asection *sec, |
9eb7b0ac | 4740 | asection *sym_sec, |
7f02625e | 4741 | struct bfd_link_info *link_info, |
e23eba97 NC |
4742 | Elf_Internal_Rela *rel, |
4743 | bfd_vma symval, | |
45f76423 AW |
4744 | bfd_vma max_alignment ATTRIBUTE_UNUSED, |
4745 | bfd_vma reserve_size ATTRIBUTE_UNUSED, | |
0a1b45a2 | 4746 | bool *again ATTRIBUTE_UNUSED, |
9abcdc10 | 4747 | riscv_pcgp_relocs *pcgp_relocs ATTRIBUTE_UNUSED, |
0a1b45a2 | 4748 | bool undefined_weak ATTRIBUTE_UNUSED) |
e23eba97 NC |
4749 | { |
4750 | bfd_byte *contents = elf_section_data (sec)->this_hdr.contents; | |
4751 | bfd_vma alignment = 1, pos; | |
4752 | while (alignment <= rel->r_addend) | |
4753 | alignment *= 2; | |
4754 | ||
4755 | symval -= rel->r_addend; | |
4756 | bfd_vma aligned_addr = ((symval - 1) & ~(alignment - 1)) + alignment; | |
4757 | bfd_vma nop_bytes = aligned_addr - symval; | |
4758 | ||
9abcdc10 LR |
4759 | /* Once we've handled an R_RISCV_ALIGN, we can't relax anything else. */ |
4760 | sec->sec_flg0 = true; | |
4761 | ||
e23eba97 NC |
4762 | /* Make sure there are enough NOPs to actually achieve the alignment. */ |
4763 | if (rel->r_addend < nop_bytes) | |
9eb7b0ac | 4764 | { |
f2b740ac AM |
4765 | _bfd_error_handler |
4766 | (_("%pB(%pA+%#" PRIx64 "): %" PRId64 " bytes required for alignment " | |
4767 | "to %" PRId64 "-byte boundary, but only %" PRId64 " present"), | |
4768 | abfd, sym_sec, (uint64_t) rel->r_offset, | |
4769 | (int64_t) nop_bytes, (int64_t) alignment, (int64_t) rel->r_addend); | |
9eb7b0ac | 4770 | bfd_set_error (bfd_error_bad_value); |
0a1b45a2 | 4771 | return false; |
9eb7b0ac | 4772 | } |
e23eba97 NC |
4773 | |
4774 | /* Delete the reloc. */ | |
4775 | rel->r_info = ELFNN_R_INFO (0, R_RISCV_NONE); | |
4776 | ||
4777 | /* If the number of NOPs is already correct, there's nothing to do. */ | |
4778 | if (nop_bytes == rel->r_addend) | |
0a1b45a2 | 4779 | return true; |
e23eba97 NC |
4780 | |
4781 | /* Write as many RISC-V NOPs as we need. */ | |
4782 | for (pos = 0; pos < (nop_bytes & -4); pos += 4) | |
fbc09e7a | 4783 | bfd_putl32 (RISCV_NOP, contents + rel->r_offset + pos); |
e23eba97 NC |
4784 | |
4785 | /* Write a final RVC NOP if need be. */ | |
4786 | if (nop_bytes % 4 != 0) | |
fbc09e7a | 4787 | bfd_putl16 (RVC_NOP, contents + rel->r_offset + pos); |
e23eba97 | 4788 | |
43025f01 | 4789 | /* Delete excess bytes. */ |
e23eba97 | 4790 | return riscv_relax_delete_bytes (abfd, sec, rel->r_offset + nop_bytes, |
9abcdc10 | 4791 | rel->r_addend - nop_bytes, link_info, |
43025f01 | 4792 | NULL, NULL); |
e23eba97 NC |
4793 | } |
4794 | ||
ff6f4d9b PD |
4795 | /* Relax PC-relative references to GP-relative references. */ |
4796 | ||
0a1b45a2 | 4797 | static bool |
1942a048 NC |
4798 | _bfd_riscv_relax_pc (bfd *abfd ATTRIBUTE_UNUSED, |
4799 | asection *sec, | |
4800 | asection *sym_sec, | |
4801 | struct bfd_link_info *link_info, | |
4802 | Elf_Internal_Rela *rel, | |
4803 | bfd_vma symval, | |
4804 | bfd_vma max_alignment, | |
4805 | bfd_vma reserve_size, | |
845652b7 | 4806 | bool *again, |
1942a048 | 4807 | riscv_pcgp_relocs *pcgp_relocs, |
0a1b45a2 | 4808 | bool undefined_weak) |
9d06997a | 4809 | { |
0699f2d7 | 4810 | struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (link_info); |
03e63766 NC |
4811 | /* Can relax to x0 even when gp relaxation is disabled. */ |
4812 | bfd_vma gp = htab->params->relax_gp | |
4813 | ? riscv_global_pointer_value (link_info) | |
4814 | : 0; | |
9d06997a PD |
4815 | |
4816 | BFD_ASSERT (rel->r_offset + 4 <= sec->size); | |
4817 | ||
4818 | /* Chain the _LO relocs to their cooresponding _HI reloc to compute the | |
dcd709e0 | 4819 | actual target address. */ |
e65b1a78 MR |
4820 | riscv_pcgp_hi_reloc hi_reloc; |
4821 | memset (&hi_reloc, 0, sizeof (hi_reloc)); | |
9d06997a PD |
4822 | switch (ELFNN_R_TYPE (rel->r_info)) |
4823 | { | |
4824 | case R_RISCV_PCREL_LO12_I: | |
4825 | case R_RISCV_PCREL_LO12_S: | |
4826 | { | |
a05f27b6 JW |
4827 | /* If the %lo has an addend, it isn't for the label pointing at the |
4828 | hi part instruction, but rather for the symbol pointed at by the | |
4829 | hi part instruction. So we must subtract it here for the lookup. | |
4830 | It is still used below in the final symbol address. */ | |
4831 | bfd_vma hi_sec_off = symval - sec_addr (sym_sec) - rel->r_addend; | |
9d06997a | 4832 | riscv_pcgp_hi_reloc *hi = riscv_find_pcgp_hi_reloc (pcgp_relocs, |
a05f27b6 | 4833 | hi_sec_off); |
9d06997a PD |
4834 | if (hi == NULL) |
4835 | { | |
a05f27b6 | 4836 | riscv_record_pcgp_lo_reloc (pcgp_relocs, hi_sec_off); |
0a1b45a2 | 4837 | return true; |
9d06997a PD |
4838 | } |
4839 | ||
4840 | hi_reloc = *hi; | |
4841 | symval = hi_reloc.hi_addr; | |
4842 | sym_sec = hi_reloc.sym_sec; | |
9d1da81b JW |
4843 | |
4844 | /* We can not know whether the undefined weak symbol is referenced | |
4845 | according to the information of R_RISCV_PCREL_LO12_I/S. Therefore, | |
4846 | we have to record the 'undefined_weak' flag when handling the | |
4847 | corresponding R_RISCV_HI20 reloc in riscv_record_pcgp_hi_reloc. */ | |
4848 | undefined_weak = hi_reloc.undefined_weak; | |
9d06997a PD |
4849 | } |
4850 | break; | |
4851 | ||
4852 | case R_RISCV_PCREL_HI20: | |
4853 | /* Mergeable symbols and code might later move out of range. */ | |
9d1da81b JW |
4854 | if (! undefined_weak |
4855 | && sym_sec->flags & (SEC_MERGE | SEC_CODE)) | |
0a1b45a2 | 4856 | return true; |
9d06997a PD |
4857 | |
4858 | /* If the cooresponding lo relocation has already been seen then it's not | |
dcd709e0 | 4859 | safe to relax this relocation. */ |
9d06997a | 4860 | if (riscv_find_pcgp_lo_reloc (pcgp_relocs, rel->r_offset)) |
0a1b45a2 | 4861 | return true; |
9d06997a PD |
4862 | |
4863 | break; | |
4864 | ||
4865 | default: | |
4866 | abort (); | |
4867 | } | |
4868 | ||
0699f2d7 | 4869 | if (!undefined_weak && gp) |
9d06997a | 4870 | { |
507685a3 JW |
4871 | /* If gp and the symbol are in the same output section, which is not the |
4872 | abs section, then consider only that output section's alignment. */ | |
9d06997a | 4873 | struct bfd_link_hash_entry *h = |
0a1b45a2 AM |
4874 | bfd_link_hash_lookup (link_info->hash, RISCV_GP_SYMBOL, false, false, |
4875 | true); | |
507685a3 JW |
4876 | if (h->u.def.section->output_section == sym_sec->output_section |
4877 | && sym_sec->output_section != bfd_abs_section_ptr) | |
9d06997a | 4878 | max_alignment = (bfd_vma) 1 << sym_sec->output_section->alignment_power; |
0699f2d7 LX |
4879 | else |
4880 | { | |
4881 | /* Consider output section alignments which are in [gp-2K, gp+2K). */ | |
4882 | max_alignment = htab->max_alignment_for_gp; | |
4883 | if (max_alignment == (bfd_vma) -1) | |
4884 | { | |
4885 | max_alignment = _bfd_riscv_get_max_alignment (sec, gp); | |
4886 | htab->max_alignment_for_gp = max_alignment; | |
4887 | } | |
4888 | } | |
9d06997a PD |
4889 | } |
4890 | ||
4891 | /* Is the reference in range of x0 or gp? | |
0699f2d7 LX |
4892 | Valid gp range conservatively because of alignment issue. |
4893 | ||
4894 | Should we also consider the alignment issue for x0 base? */ | |
9d1da81b | 4895 | if (undefined_weak |
0699f2d7 LX |
4896 | || VALID_ITYPE_IMM (symval) |
4897 | || (symval >= gp | |
4898 | && VALID_ITYPE_IMM (symval - gp + max_alignment + reserve_size)) | |
4899 | || (symval < gp | |
4900 | && VALID_ITYPE_IMM (symval - gp - max_alignment - reserve_size))) | |
9d06997a PD |
4901 | { |
4902 | unsigned sym = hi_reloc.hi_sym; | |
4903 | switch (ELFNN_R_TYPE (rel->r_info)) | |
4904 | { | |
4905 | case R_RISCV_PCREL_LO12_I: | |
a48ddc3b NC |
4906 | rel->r_info = ELFNN_R_INFO (sym, R_RISCV_GPREL_I); |
4907 | rel->r_addend += hi_reloc.hi_addend; | |
0a1b45a2 | 4908 | return true; |
9d06997a PD |
4909 | |
4910 | case R_RISCV_PCREL_LO12_S: | |
a48ddc3b NC |
4911 | rel->r_info = ELFNN_R_INFO (sym, R_RISCV_GPREL_S); |
4912 | rel->r_addend += hi_reloc.hi_addend; | |
0a1b45a2 | 4913 | return true; |
9d06997a PD |
4914 | |
4915 | case R_RISCV_PCREL_HI20: | |
07d6d2b8 | 4916 | riscv_record_pcgp_hi_reloc (pcgp_relocs, |
9d06997a PD |
4917 | rel->r_offset, |
4918 | rel->r_addend, | |
4919 | symval, | |
4920 | ELFNN_R_SYM(rel->r_info), | |
9d1da81b JW |
4921 | sym_sec, |
4922 | undefined_weak); | |
43025f01 | 4923 | /* Delete unnecessary AUIPC and reuse the reloc. */ |
845652b7 | 4924 | *again = true; |
43025f01 PN |
4925 | riscv_relax_delete_bytes (abfd, sec, rel->r_offset, 4, link_info, |
4926 | pcgp_relocs, rel); | |
0a1b45a2 | 4927 | return true; |
9d06997a PD |
4928 | |
4929 | default: | |
4930 | abort (); | |
4931 | } | |
4932 | } | |
4933 | ||
0a1b45a2 | 4934 | return true; |
9d06997a PD |
4935 | } |
4936 | ||
ef9d2565 NC |
4937 | /* Called by after_allocation to set the information of data segment |
4938 | before relaxing. */ | |
4939 | ||
4940 | void | |
4941 | bfd_elfNN_riscv_set_data_segment_info (struct bfd_link_info *info, | |
4942 | int *data_segment_phase) | |
4943 | { | |
4944 | struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info); | |
4945 | htab->data_segment_phase = data_segment_phase; | |
4946 | } | |
4947 | ||
dcd709e0 NC |
4948 | /* Relax a section. |
4949 | ||
779b2502 TO |
4950 | Pass 0: Shortens code sequences for LUI/CALL/TPREL/PCREL relocs and |
4951 | deletes the obsolete bytes. | |
4952 | Pass 1: Which cannot be disabled, handles code alignment directives. */ | |
e23eba97 | 4953 | |
0a1b45a2 | 4954 | static bool |
e23eba97 NC |
4955 | _bfd_riscv_relax_section (bfd *abfd, asection *sec, |
4956 | struct bfd_link_info *info, | |
0a1b45a2 | 4957 | bool *again) |
e23eba97 NC |
4958 | { |
4959 | Elf_Internal_Shdr *symtab_hdr = &elf_symtab_hdr (abfd); | |
4960 | struct riscv_elf_link_hash_table *htab = riscv_elf_hash_table (info); | |
4961 | struct bfd_elf_section_data *data = elf_section_data (sec); | |
4962 | Elf_Internal_Rela *relocs; | |
0a1b45a2 | 4963 | bool ret = false; |
e23eba97 | 4964 | unsigned int i; |
45f76423 | 4965 | bfd_vma max_alignment, reserve_size = 0; |
9d06997a | 4966 | riscv_pcgp_relocs pcgp_relocs; |
0699f2d7 | 4967 | static asection *first_section = NULL; |
e23eba97 | 4968 | |
0a1b45a2 | 4969 | *again = false; |
e23eba97 NC |
4970 | |
4971 | if (bfd_link_relocatable (info) | |
9abcdc10 | 4972 | || sec->sec_flg0 |
e23eba97 | 4973 | || sec->reloc_count == 0 |
3a574cce AM |
4974 | || (sec->flags & SEC_RELOC) == 0 |
4975 | || (sec->flags & SEC_HAS_CONTENTS) == 0 | |
e23eba97 | 4976 | || (info->disable_target_specific_optimizations |
9abcdc10 | 4977 | && info->relax_pass == 0) |
ef9d2565 NC |
4978 | /* The exp_seg_relro_adjust is enum phase_enum (0x4), |
4979 | and defined in ld/ldexp.h. */ | |
4980 | || *(htab->data_segment_phase) == 4) | |
0a1b45a2 | 4981 | return true; |
e23eba97 | 4982 | |
0699f2d7 LX |
4983 | /* Record the first relax section, so that we can reset the |
4984 | max_alignment_for_gp for the repeated relax passes. */ | |
4985 | if (first_section == NULL) | |
4986 | first_section = sec; | |
4987 | else if (first_section == sec) | |
4988 | htab->max_alignment_for_gp = -1; | |
4989 | ||
9d06997a PD |
4990 | riscv_init_pcgp_relocs (&pcgp_relocs); |
4991 | ||
e23eba97 NC |
4992 | /* Read this BFD's relocs if we haven't done so already. */ |
4993 | if (data->relocs) | |
4994 | relocs = data->relocs; | |
4995 | else if (!(relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, | |
4996 | info->keep_memory))) | |
4997 | goto fail; | |
4998 | ||
0699f2d7 LX |
4999 | /* Estimate the maximum alignment for all output sections once time |
5000 | should be enough. */ | |
5001 | max_alignment = htab->max_alignment; | |
5002 | if (max_alignment == (bfd_vma) -1) | |
fc3c5343 | 5003 | { |
0699f2d7 LX |
5004 | max_alignment = _bfd_riscv_get_max_alignment (sec, 0/* gp */); |
5005 | htab->max_alignment = max_alignment; | |
fc3c5343 | 5006 | } |
e23eba97 NC |
5007 | |
5008 | /* Examine and consider relaxing each reloc. */ | |
5009 | for (i = 0; i < sec->reloc_count; i++) | |
5010 | { | |
5011 | asection *sym_sec; | |
5012 | Elf_Internal_Rela *rel = relocs + i; | |
45f76423 | 5013 | relax_func_t relax_func; |
e23eba97 NC |
5014 | int type = ELFNN_R_TYPE (rel->r_info); |
5015 | bfd_vma symval; | |
04b865dc | 5016 | char symtype; |
0a1b45a2 | 5017 | bool undefined_weak = false; |
e23eba97 | 5018 | |
ff6f4d9b | 5019 | relax_func = NULL; |
43025f01 | 5020 | riscv_relax_delete_bytes = NULL; |
e23eba97 NC |
5021 | if (info->relax_pass == 0) |
5022 | { | |
abd20cb6 NC |
5023 | if (type == R_RISCV_CALL |
5024 | || type == R_RISCV_CALL_PLT) | |
e23eba97 NC |
5025 | relax_func = _bfd_riscv_relax_call; |
5026 | else if (type == R_RISCV_HI20 | |
5027 | || type == R_RISCV_LO12_I | |
5028 | || type == R_RISCV_LO12_S) | |
5029 | relax_func = _bfd_riscv_relax_lui; | |
45f76423 AW |
5030 | else if (type == R_RISCV_TPREL_HI20 |
5031 | || type == R_RISCV_TPREL_ADD | |
5032 | || type == R_RISCV_TPREL_LO12_I | |
5033 | || type == R_RISCV_TPREL_LO12_S) | |
e23eba97 | 5034 | relax_func = _bfd_riscv_relax_tls_le; |
03e63766 | 5035 | else if (!bfd_link_pic (info) |
9abcdc10 LR |
5036 | && (type == R_RISCV_PCREL_HI20 |
5037 | || type == R_RISCV_PCREL_LO12_I | |
5038 | || type == R_RISCV_PCREL_LO12_S)) | |
5039 | relax_func = _bfd_riscv_relax_pc; | |
45f76423 AW |
5040 | else |
5041 | continue; | |
43025f01 | 5042 | riscv_relax_delete_bytes = _riscv_relax_delete_piecewise; |
45f76423 AW |
5043 | |
5044 | /* Only relax this reloc if it is paired with R_RISCV_RELAX. */ | |
5045 | if (i == sec->reloc_count - 1 | |
5046 | || ELFNN_R_TYPE ((rel + 1)->r_info) != R_RISCV_RELAX | |
5047 | || rel->r_offset != (rel + 1)->r_offset) | |
5048 | continue; | |
5049 | ||
5050 | /* Skip over the R_RISCV_RELAX. */ | |
5051 | i++; | |
e23eba97 | 5052 | } |
43025f01 PN |
5053 | else if (info->relax_pass == 1 && type == R_RISCV_ALIGN) |
5054 | { | |
5055 | relax_func = _bfd_riscv_relax_align; | |
5056 | riscv_relax_delete_bytes = _riscv_relax_delete_immediate; | |
5057 | } | |
9abcdc10 LR |
5058 | else |
5059 | continue; | |
e23eba97 NC |
5060 | |
5061 | data->relocs = relocs; | |
5062 | ||
5063 | /* Read this BFD's contents if we haven't done so already. */ | |
5064 | if (!data->this_hdr.contents | |
5065 | && !bfd_malloc_and_get_section (abfd, sec, &data->this_hdr.contents)) | |
5066 | goto fail; | |
5067 | ||
5068 | /* Read this BFD's symbols if we haven't done so already. */ | |
5069 | if (symtab_hdr->sh_info != 0 | |
5070 | && !symtab_hdr->contents | |
5071 | && !(symtab_hdr->contents = | |
5072 | (unsigned char *) bfd_elf_get_elf_syms (abfd, symtab_hdr, | |
5073 | symtab_hdr->sh_info, | |
5074 | 0, NULL, NULL, NULL))) | |
5075 | goto fail; | |
5076 | ||
5077 | /* Get the value of the symbol referred to by the reloc. */ | |
5078 | if (ELFNN_R_SYM (rel->r_info) < symtab_hdr->sh_info) | |
5079 | { | |
5080 | /* A local symbol. */ | |
5081 | Elf_Internal_Sym *isym = ((Elf_Internal_Sym *) symtab_hdr->contents | |
5082 | + ELFNN_R_SYM (rel->r_info)); | |
45f76423 AW |
5083 | reserve_size = (isym->st_size - rel->r_addend) > isym->st_size |
5084 | ? 0 : isym->st_size - rel->r_addend; | |
e23eba97 | 5085 | |
02dd9d25 NC |
5086 | /* Relocate against local STT_GNU_IFUNC symbol. we have created |
5087 | a fake global symbol entry for this, so deal with the local ifunc | |
5088 | as a global. */ | |
5089 | if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) | |
5090 | continue; | |
5091 | ||
e23eba97 | 5092 | if (isym->st_shndx == SHN_UNDEF) |
04b865dc | 5093 | sym_sec = sec, symval = rel->r_offset; |
e23eba97 NC |
5094 | else |
5095 | { | |
5096 | BFD_ASSERT (isym->st_shndx < elf_numsections (abfd)); | |
5097 | sym_sec = elf_elfsections (abfd)[isym->st_shndx]->bfd_section; | |
09ca4b9d JW |
5098 | #if 0 |
5099 | /* The purpose of this code is unknown. It breaks linker scripts | |
5100 | for embedded development that place sections at address zero. | |
5101 | This code is believed to be unnecessary. Disabling it but not | |
5102 | yet removing it, in case something breaks. */ | |
e23eba97 NC |
5103 | if (sec_addr (sym_sec) == 0) |
5104 | continue; | |
09ca4b9d | 5105 | #endif |
04b865dc | 5106 | symval = isym->st_value; |
e23eba97 | 5107 | } |
04b865dc | 5108 | symtype = ELF_ST_TYPE (isym->st_info); |
e23eba97 NC |
5109 | } |
5110 | else | |
5111 | { | |
5112 | unsigned long indx; | |
5113 | struct elf_link_hash_entry *h; | |
5114 | ||
5115 | indx = ELFNN_R_SYM (rel->r_info) - symtab_hdr->sh_info; | |
5116 | h = elf_sym_hashes (abfd)[indx]; | |
5117 | ||
5118 | while (h->root.type == bfd_link_hash_indirect | |
5119 | || h->root.type == bfd_link_hash_warning) | |
5120 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
5121 | ||
02dd9d25 NC |
5122 | /* Disable the relaxation for ifunc. */ |
5123 | if (h != NULL && h->type == STT_GNU_IFUNC) | |
5124 | continue; | |
5125 | ||
d08515a6 NC |
5126 | /* Maybe we should check UNDEFWEAK_NO_DYNAMIC_RELOC here? But that |
5127 | will break the undefweak relaxation testcases, so just make sure | |
5128 | we won't do relaxations for linker_def symbols in short-term. */ | |
9d1da81b | 5129 | if (h->root.type == bfd_link_hash_undefweak |
d08515a6 NC |
5130 | /* The linker_def symbol like __ehdr_start that may be undefweak |
5131 | for now, but will be guaranteed to be defined later. */ | |
5132 | && !h->root.linker_def | |
9d1da81b JW |
5133 | && (relax_func == _bfd_riscv_relax_lui |
5134 | || relax_func == _bfd_riscv_relax_pc)) | |
5135 | { | |
5136 | /* For the lui and auipc relaxations, since the symbol | |
5137 | value of an undefined weak symbol is always be zero, | |
5138 | we can optimize the patterns into a single LI/MV/ADDI | |
5139 | instruction. | |
5140 | ||
5141 | Note that, creating shared libraries and pie output may | |
5142 | break the rule above. Fortunately, since we do not relax | |
5143 | pc relocs when creating shared libraries and pie output, | |
5144 | and the absolute address access for R_RISCV_HI20 isn't | |
5145 | allowed when "-fPIC" is set, the problem of creating shared | |
5146 | libraries can not happen currently. Once we support the | |
5147 | auipc relaxations when creating shared libraries, then we will | |
5148 | need the more rigorous checking for this optimization. */ | |
0a1b45a2 | 5149 | undefined_weak = true; |
9d1da81b JW |
5150 | } |
5151 | ||
85f78364 JW |
5152 | /* This line has to match the check in riscv_elf_relocate_section |
5153 | in the R_RISCV_CALL[_PLT] case. */ | |
5154 | if (bfd_link_pic (info) && h->plt.offset != MINUS_ONE) | |
04b865dc JW |
5155 | { |
5156 | sym_sec = htab->elf.splt; | |
5157 | symval = h->plt.offset; | |
5158 | } | |
9d1da81b JW |
5159 | else if (undefined_weak) |
5160 | { | |
5161 | symval = 0; | |
5162 | sym_sec = bfd_und_section_ptr; | |
5163 | } | |
a2714d6c AM |
5164 | else if ((h->root.type == bfd_link_hash_defined |
5165 | || h->root.type == bfd_link_hash_defweak) | |
5166 | && h->root.u.def.section != NULL | |
5167 | && h->root.u.def.section->output_section != NULL) | |
04b865dc JW |
5168 | { |
5169 | symval = h->root.u.def.value; | |
5170 | sym_sec = h->root.u.def.section; | |
5171 | } | |
a2714d6c AM |
5172 | else |
5173 | continue; | |
e23eba97 | 5174 | |
45f76423 AW |
5175 | if (h->type != STT_FUNC) |
5176 | reserve_size = | |
5177 | (h->size - rel->r_addend) > h->size ? 0 : h->size - rel->r_addend; | |
04b865dc | 5178 | symtype = h->type; |
e23eba97 NC |
5179 | } |
5180 | ||
04b865dc JW |
5181 | if (sym_sec->sec_info_type == SEC_INFO_TYPE_MERGE |
5182 | && (sym_sec->flags & SEC_MERGE)) | |
5183 | { | |
5184 | /* At this stage in linking, no SEC_MERGE symbol has been | |
5185 | adjusted, so all references to such symbols need to be | |
5186 | passed through _bfd_merged_section_offset. (Later, in | |
5187 | relocate_section, all SEC_MERGE symbols *except* for | |
5188 | section symbols have been adjusted.) | |
5189 | ||
5190 | gas may reduce relocations against symbols in SEC_MERGE | |
5191 | sections to a relocation against the section symbol when | |
5192 | the original addend was zero. When the reloc is against | |
5193 | a section symbol we should include the addend in the | |
5194 | offset passed to _bfd_merged_section_offset, since the | |
5195 | location of interest is the original symbol. On the | |
5196 | other hand, an access to "sym+addend" where "sym" is not | |
5197 | a section symbol should not include the addend; Such an | |
5198 | access is presumed to be an offset from "sym"; The | |
5199 | location of interest is just "sym". */ | |
5200 | if (symtype == STT_SECTION) | |
5201 | symval += rel->r_addend; | |
5202 | ||
5203 | symval = _bfd_merged_section_offset (abfd, &sym_sec, | |
5204 | elf_section_data (sym_sec)->sec_info, | |
5205 | symval); | |
5206 | ||
5207 | if (symtype != STT_SECTION) | |
5208 | symval += rel->r_addend; | |
5209 | } | |
5210 | else | |
5211 | symval += rel->r_addend; | |
5212 | ||
5213 | symval += sec_addr (sym_sec); | |
e23eba97 NC |
5214 | |
5215 | if (!relax_func (abfd, sec, sym_sec, info, rel, symval, | |
9d06997a | 5216 | max_alignment, reserve_size, again, |
9d1da81b | 5217 | &pcgp_relocs, undefined_weak)) |
e23eba97 NC |
5218 | goto fail; |
5219 | } | |
5220 | ||
43025f01 PN |
5221 | /* Resolve R_RISCV_DELETE relocations. */ |
5222 | if (!riscv_relax_resolve_delete_relocs (abfd, sec, info, relocs)) | |
5223 | goto fail; | |
5224 | ||
0a1b45a2 | 5225 | ret = true; |
e23eba97 | 5226 | |
dc1e8a47 | 5227 | fail: |
e23eba97 NC |
5228 | if (relocs != data->relocs) |
5229 | free (relocs); | |
1942a048 | 5230 | riscv_free_pcgp_relocs (&pcgp_relocs, abfd, sec); |
e23eba97 NC |
5231 | |
5232 | return ret; | |
5233 | } | |
5234 | ||
5235 | #if ARCH_SIZE == 32 | |
79b8e8ab | 5236 | # define PRSTATUS_SIZE 204 |
e23eba97 NC |
5237 | # define PRSTATUS_OFFSET_PR_CURSIG 12 |
5238 | # define PRSTATUS_OFFSET_PR_PID 24 | |
5239 | # define PRSTATUS_OFFSET_PR_REG 72 | |
5240 | # define ELF_GREGSET_T_SIZE 128 | |
5241 | # define PRPSINFO_SIZE 128 | |
5242 | # define PRPSINFO_OFFSET_PR_PID 16 | |
5243 | # define PRPSINFO_OFFSET_PR_FNAME 32 | |
5244 | # define PRPSINFO_OFFSET_PR_PSARGS 48 | |
0897bb7d AB |
5245 | # define PRPSINFO_PR_FNAME_LENGTH 16 |
5246 | # define PRPSINFO_PR_PSARGS_LENGTH 80 | |
e23eba97 NC |
5247 | #else |
5248 | # define PRSTATUS_SIZE 376 | |
5249 | # define PRSTATUS_OFFSET_PR_CURSIG 12 | |
5250 | # define PRSTATUS_OFFSET_PR_PID 32 | |
5251 | # define PRSTATUS_OFFSET_PR_REG 112 | |
5252 | # define ELF_GREGSET_T_SIZE 256 | |
5253 | # define PRPSINFO_SIZE 136 | |
5254 | # define PRPSINFO_OFFSET_PR_PID 24 | |
5255 | # define PRPSINFO_OFFSET_PR_FNAME 40 | |
5256 | # define PRPSINFO_OFFSET_PR_PSARGS 56 | |
0897bb7d AB |
5257 | # define PRPSINFO_PR_FNAME_LENGTH 16 |
5258 | # define PRPSINFO_PR_PSARGS_LENGTH 80 | |
e23eba97 NC |
5259 | #endif |
5260 | ||
0897bb7d AB |
5261 | /* Write PRSTATUS and PRPSINFO note into core file. This will be called |
5262 | before the generic code in elf.c. By checking the compiler defines we | |
5263 | only perform any action here if the generic code would otherwise not be | |
5264 | able to help us. The intention is that bare metal core dumps (where the | |
5265 | prstatus_t and/or prpsinfo_t might not be available) will use this code, | |
5266 | while non bare metal tools will use the generic elf code. */ | |
5267 | ||
5268 | static char * | |
5269 | riscv_write_core_note (bfd *abfd ATTRIBUTE_UNUSED, | |
5270 | char *buf ATTRIBUTE_UNUSED, | |
5271 | int *bufsiz ATTRIBUTE_UNUSED, | |
5272 | int note_type ATTRIBUTE_UNUSED, ...) | |
5273 | { | |
5274 | switch (note_type) | |
5275 | { | |
5276 | default: | |
5277 | return NULL; | |
5278 | ||
5279 | #if !defined (HAVE_PRPSINFO_T) | |
5280 | case NT_PRPSINFO: | |
5281 | { | |
5282 | char data[PRPSINFO_SIZE] ATTRIBUTE_NONSTRING; | |
5283 | va_list ap; | |
5284 | ||
5285 | va_start (ap, note_type); | |
5286 | memset (data, 0, sizeof (data)); | |
5287 | strncpy (data + PRPSINFO_OFFSET_PR_FNAME, va_arg (ap, const char *), | |
5288 | PRPSINFO_PR_FNAME_LENGTH); | |
5289 | #if GCC_VERSION == 8000 || GCC_VERSION == 8001 | |
5290 | DIAGNOSTIC_PUSH; | |
5291 | /* GCC 8.0 and 8.1 warn about 80 equals destination size with | |
5292 | -Wstringop-truncation: | |
5293 | https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85643 | |
5294 | */ | |
5295 | DIAGNOSTIC_IGNORE_STRINGOP_TRUNCATION; | |
5296 | #endif | |
5297 | strncpy (data + PRPSINFO_OFFSET_PR_PSARGS, va_arg (ap, const char *), | |
5298 | PRPSINFO_PR_PSARGS_LENGTH); | |
5299 | #if GCC_VERSION == 8000 || GCC_VERSION == 8001 | |
5300 | DIAGNOSTIC_POP; | |
5301 | #endif | |
5302 | va_end (ap); | |
5303 | return elfcore_write_note (abfd, buf, bufsiz, | |
5304 | "CORE", note_type, data, sizeof (data)); | |
5305 | } | |
5306 | #endif /* !HAVE_PRPSINFO_T */ | |
5307 | ||
5308 | #if !defined (HAVE_PRSTATUS_T) | |
5309 | case NT_PRSTATUS: | |
5310 | { | |
5311 | char data[PRSTATUS_SIZE]; | |
5312 | va_list ap; | |
5313 | long pid; | |
5314 | int cursig; | |
5315 | const void *greg; | |
5316 | ||
5317 | va_start (ap, note_type); | |
5318 | memset (data, 0, sizeof(data)); | |
5319 | pid = va_arg (ap, long); | |
5320 | bfd_put_32 (abfd, pid, data + PRSTATUS_OFFSET_PR_PID); | |
5321 | cursig = va_arg (ap, int); | |
5322 | bfd_put_16 (abfd, cursig, data + PRSTATUS_OFFSET_PR_CURSIG); | |
5323 | greg = va_arg (ap, const void *); | |
5324 | memcpy (data + PRSTATUS_OFFSET_PR_REG, greg, | |
5325 | PRSTATUS_SIZE - PRSTATUS_OFFSET_PR_REG - ARCH_SIZE / 8); | |
5326 | va_end (ap); | |
5327 | return elfcore_write_note (abfd, buf, bufsiz, | |
5328 | "CORE", note_type, data, sizeof (data)); | |
5329 | } | |
5330 | #endif /* !HAVE_PRSTATUS_T */ | |
5331 | } | |
5332 | } | |
5333 | ||
e23eba97 NC |
5334 | /* Support for core dump NOTE sections. */ |
5335 | ||
0a1b45a2 | 5336 | static bool |
e23eba97 NC |
5337 | riscv_elf_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) |
5338 | { | |
5339 | switch (note->descsz) | |
5340 | { | |
5341 | default: | |
0a1b45a2 | 5342 | return false; |
e23eba97 | 5343 | |
dcd709e0 | 5344 | case PRSTATUS_SIZE: /* sizeof(struct elf_prstatus) on Linux/RISC-V. */ |
e23eba97 NC |
5345 | /* pr_cursig */ |
5346 | elf_tdata (abfd)->core->signal | |
5347 | = bfd_get_16 (abfd, note->descdata + PRSTATUS_OFFSET_PR_CURSIG); | |
5348 | ||
5349 | /* pr_pid */ | |
5350 | elf_tdata (abfd)->core->lwpid | |
5351 | = bfd_get_32 (abfd, note->descdata + PRSTATUS_OFFSET_PR_PID); | |
5352 | break; | |
5353 | } | |
5354 | ||
5355 | /* Make a ".reg/999" section. */ | |
5356 | return _bfd_elfcore_make_pseudosection (abfd, ".reg", ELF_GREGSET_T_SIZE, | |
5357 | note->descpos + PRSTATUS_OFFSET_PR_REG); | |
5358 | } | |
5359 | ||
0a1b45a2 | 5360 | static bool |
e23eba97 NC |
5361 | riscv_elf_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) |
5362 | { | |
5363 | switch (note->descsz) | |
5364 | { | |
5365 | default: | |
0a1b45a2 | 5366 | return false; |
e23eba97 NC |
5367 | |
5368 | case PRPSINFO_SIZE: /* sizeof(struct elf_prpsinfo) on Linux/RISC-V. */ | |
5369 | /* pr_pid */ | |
5370 | elf_tdata (abfd)->core->pid | |
5371 | = bfd_get_32 (abfd, note->descdata + PRPSINFO_OFFSET_PR_PID); | |
5372 | ||
5373 | /* pr_fname */ | |
5374 | elf_tdata (abfd)->core->program = _bfd_elfcore_strndup | |
0897bb7d AB |
5375 | (abfd, note->descdata + PRPSINFO_OFFSET_PR_FNAME, |
5376 | PRPSINFO_PR_FNAME_LENGTH); | |
e23eba97 NC |
5377 | |
5378 | /* pr_psargs */ | |
5379 | elf_tdata (abfd)->core->command = _bfd_elfcore_strndup | |
0897bb7d AB |
5380 | (abfd, note->descdata + PRPSINFO_OFFSET_PR_PSARGS, |
5381 | PRPSINFO_PR_PSARGS_LENGTH); | |
e23eba97 NC |
5382 | break; |
5383 | } | |
5384 | ||
5385 | /* Note that for some reason, a spurious space is tacked | |
5386 | onto the end of the args in some (at least one anyway) | |
5387 | implementations, so strip it off if it exists. */ | |
5388 | ||
5389 | { | |
5390 | char *command = elf_tdata (abfd)->core->command; | |
5391 | int n = strlen (command); | |
5392 | ||
5393 | if (0 < n && command[n - 1] == ' ') | |
5394 | command[n - 1] = '\0'; | |
5395 | } | |
5396 | ||
0a1b45a2 | 5397 | return true; |
e23eba97 NC |
5398 | } |
5399 | ||
640d6bfd | 5400 | /* Set the right mach type. */ |
dcd709e0 | 5401 | |
0a1b45a2 | 5402 | static bool |
640d6bfd KLC |
5403 | riscv_elf_object_p (bfd *abfd) |
5404 | { | |
5405 | /* There are only two mach types in RISCV currently. */ | |
fbc09e7a MC |
5406 | if (strcmp (abfd->xvec->name, "elf32-littleriscv") == 0 |
5407 | || strcmp (abfd->xvec->name, "elf32-bigriscv") == 0) | |
640d6bfd KLC |
5408 | bfd_default_set_arch_mach (abfd, bfd_arch_riscv, bfd_mach_riscv32); |
5409 | else | |
5410 | bfd_default_set_arch_mach (abfd, bfd_arch_riscv, bfd_mach_riscv64); | |
5411 | ||
0a1b45a2 | 5412 | return true; |
640d6bfd KLC |
5413 | } |
5414 | ||
2dc8dd17 JW |
5415 | /* Determine whether an object attribute tag takes an integer, a |
5416 | string or both. */ | |
5417 | ||
5418 | static int | |
5419 | riscv_elf_obj_attrs_arg_type (int tag) | |
5420 | { | |
5421 | return (tag & 1) != 0 ? ATTR_TYPE_FLAG_STR_VAL : ATTR_TYPE_FLAG_INT_VAL; | |
5422 | } | |
e23eba97 | 5423 | |
9b9b1092 NC |
5424 | /* Do not choose mapping symbols as a function name. */ |
5425 | ||
5426 | static bfd_size_type | |
5427 | riscv_maybe_function_sym (const asymbol *sym, | |
5428 | asection *sec, | |
5429 | bfd_vma *code_off) | |
5430 | { | |
5431 | if (sym->flags & BSF_LOCAL | |
5432 | && riscv_elf_is_mapping_symbols (sym->name)) | |
5433 | return 0; | |
5434 | ||
5435 | return _bfd_elf_maybe_function_sym (sym, sec, code_off); | |
5436 | } | |
5437 | ||
5438 | /* Treat the following cases as target special symbols, they are | |
5439 | usually omitted. */ | |
ddfe525f NC |
5440 | |
5441 | static bool | |
5442 | riscv_elf_is_target_special_symbol (bfd *abfd, asymbol *sym) | |
5443 | { | |
9b9b1092 NC |
5444 | /* PR27584, local and empty symbols. Since they are usually |
5445 | generated for pcrel relocations. */ | |
ddfe525f | 5446 | return (!strcmp (sym->name, "") |
9b9b1092 NC |
5447 | || _bfd_elf_is_local_label_name (abfd, sym->name) |
5448 | /* PR27916, mapping symbols. */ | |
5449 | || riscv_elf_is_mapping_symbols (sym->name)); | |
ddfe525f NC |
5450 | } |
5451 | ||
fbc95f1e KC |
5452 | static int |
5453 | riscv_elf_additional_program_headers (bfd *abfd, | |
5454 | struct bfd_link_info *info ATTRIBUTE_UNUSED) | |
5455 | { | |
fbc95f1e KC |
5456 | int ret = 0; |
5457 | ||
5458 | /* See if we need a PT_RISCV_ATTRIBUTES segment. */ | |
5459 | if (bfd_get_section_by_name (abfd, RISCV_ATTRIBUTES_SECTION_NAME)) | |
5460 | ++ret; | |
5461 | ||
5462 | return ret; | |
5463 | } | |
5464 | ||
5465 | static bool | |
5466 | riscv_elf_modify_segment_map (bfd *abfd, | |
70a59063 | 5467 | struct bfd_link_info *info ATTRIBUTE_UNUSED) |
fbc95f1e KC |
5468 | { |
5469 | asection *s; | |
5470 | struct elf_segment_map *m, **pm; | |
5471 | size_t amt; | |
5472 | ||
5473 | /* If there is a .riscv.attributes section, we need a PT_RISCV_ATTRIBUTES | |
5474 | segment. */ | |
5475 | s = bfd_get_section_by_name (abfd, RISCV_ATTRIBUTES_SECTION_NAME); | |
5476 | if (s != NULL) | |
5477 | { | |
5478 | for (m = elf_seg_map (abfd); m != NULL; m = m->next) | |
5479 | if (m->p_type == PT_RISCV_ATTRIBUTES) | |
5480 | break; | |
5481 | /* If there is already a PT_RISCV_ATTRIBUTES header, avoid adding | |
5482 | another. */ | |
5483 | if (m == NULL) | |
5484 | { | |
5485 | amt = sizeof (*m); | |
5486 | m = bfd_zalloc (abfd, amt); | |
5487 | if (m == NULL) | |
5488 | return false; | |
5489 | ||
5490 | m->p_type = PT_RISCV_ATTRIBUTES; | |
5491 | m->count = 1; | |
5492 | m->sections[0] = s; | |
5493 | ||
5494 | /* We want to put it after the PHDR and INTERP segments. */ | |
5495 | pm = &elf_seg_map (abfd); | |
5496 | while (*pm != NULL | |
5497 | && ((*pm)->p_type == PT_PHDR | |
5498 | || (*pm)->p_type == PT_INTERP)) | |
5499 | pm = &(*pm)->next; | |
5500 | ||
5501 | m->next = *pm; | |
5502 | *pm = m; | |
5503 | } | |
5504 | } | |
5505 | ||
5506 | return true; | |
5507 | } | |
5508 | ||
8155b853 NC |
5509 | /* Merge non-visibility st_other attributes. */ |
5510 | ||
5511 | static void | |
5512 | riscv_elf_merge_symbol_attribute (struct elf_link_hash_entry *h, | |
5513 | unsigned int st_other, | |
5514 | bool definition ATTRIBUTE_UNUSED, | |
5515 | bool dynamic ATTRIBUTE_UNUSED) | |
5516 | { | |
5517 | unsigned int isym_sto = st_other & ~ELF_ST_VISIBILITY (-1); | |
5518 | unsigned int h_sto = h->other & ~ELF_ST_VISIBILITY (-1); | |
5519 | ||
5520 | if (isym_sto == h_sto) | |
5521 | return; | |
5522 | ||
5523 | if (isym_sto & ~STO_RISCV_VARIANT_CC) | |
5524 | _bfd_error_handler (_("unknown attribute for symbol `%s': 0x%02x"), | |
5525 | h->root.root.string, isym_sto); | |
5526 | ||
5527 | if (isym_sto & STO_RISCV_VARIANT_CC) | |
5528 | h->other |= STO_RISCV_VARIANT_CC; | |
5529 | } | |
5530 | ||
1942a048 NC |
5531 | #define TARGET_LITTLE_SYM riscv_elfNN_vec |
5532 | #define TARGET_LITTLE_NAME "elfNN-littleriscv" | |
5533 | #define TARGET_BIG_SYM riscv_elfNN_be_vec | |
5534 | #define TARGET_BIG_NAME "elfNN-bigriscv" | |
e23eba97 | 5535 | |
1942a048 | 5536 | #define elf_backend_reloc_type_class riscv_reloc_type_class |
e23eba97 | 5537 | |
1942a048 NC |
5538 | #define bfd_elfNN_bfd_reloc_name_lookup riscv_reloc_name_lookup |
5539 | #define bfd_elfNN_bfd_link_hash_table_create riscv_elf_link_hash_table_create | |
5540 | #define bfd_elfNN_bfd_reloc_type_lookup riscv_reloc_type_lookup | |
e23eba97 NC |
5541 | #define bfd_elfNN_bfd_merge_private_bfd_data \ |
5542 | _bfd_riscv_elf_merge_private_bfd_data | |
ddfe525f | 5543 | #define bfd_elfNN_bfd_is_target_special_symbol riscv_elf_is_target_special_symbol |
e23eba97 | 5544 | |
1942a048 NC |
5545 | #define elf_backend_copy_indirect_symbol riscv_elf_copy_indirect_symbol |
5546 | #define elf_backend_create_dynamic_sections riscv_elf_create_dynamic_sections | |
5547 | #define elf_backend_check_relocs riscv_elf_check_relocs | |
5548 | #define elf_backend_adjust_dynamic_symbol riscv_elf_adjust_dynamic_symbol | |
5549 | #define elf_backend_size_dynamic_sections riscv_elf_size_dynamic_sections | |
5550 | #define elf_backend_relocate_section riscv_elf_relocate_section | |
5551 | #define elf_backend_finish_dynamic_symbol riscv_elf_finish_dynamic_symbol | |
5552 | #define elf_backend_finish_dynamic_sections riscv_elf_finish_dynamic_sections | |
1942a048 NC |
5553 | #define elf_backend_plt_sym_val riscv_elf_plt_sym_val |
5554 | #define elf_backend_grok_prstatus riscv_elf_grok_prstatus | |
5555 | #define elf_backend_grok_psinfo riscv_elf_grok_psinfo | |
5556 | #define elf_backend_object_p riscv_elf_object_p | |
0897bb7d | 5557 | #define elf_backend_write_core_note riscv_write_core_note |
9b9b1092 | 5558 | #define elf_backend_maybe_function_sym riscv_maybe_function_sym |
1942a048 NC |
5559 | #define elf_info_to_howto_rel NULL |
5560 | #define elf_info_to_howto riscv_info_to_howto_rela | |
5561 | #define bfd_elfNN_bfd_relax_section _bfd_riscv_relax_section | |
5562 | #define bfd_elfNN_mkobject elfNN_riscv_mkobject | |
fbc95f1e KC |
5563 | #define elf_backend_additional_program_headers \ |
5564 | riscv_elf_additional_program_headers | |
5565 | #define elf_backend_modify_segment_map riscv_elf_modify_segment_map | |
8155b853 | 5566 | #define elf_backend_merge_symbol_attribute riscv_elf_merge_symbol_attribute |
1942a048 NC |
5567 | |
5568 | #define elf_backend_init_index_section _bfd_elf_init_1_index_section | |
5569 | ||
5570 | #define elf_backend_can_gc_sections 1 | |
5571 | #define elf_backend_can_refcount 1 | |
5572 | #define elf_backend_want_got_plt 1 | |
5573 | #define elf_backend_plt_readonly 1 | |
5574 | #define elf_backend_plt_alignment 4 | |
5575 | #define elf_backend_want_plt_sym 1 | |
5576 | #define elf_backend_got_header_size (ARCH_SIZE / 8) | |
5577 | #define elf_backend_want_dynrelro 1 | |
5578 | #define elf_backend_rela_normal 1 | |
5579 | #define elf_backend_default_execstack 0 | |
e23eba97 | 5580 | |
2dc8dd17 | 5581 | #undef elf_backend_obj_attrs_vendor |
1942a048 | 5582 | #define elf_backend_obj_attrs_vendor "riscv" |
2dc8dd17 | 5583 | #undef elf_backend_obj_attrs_arg_type |
1942a048 | 5584 | #define elf_backend_obj_attrs_arg_type riscv_elf_obj_attrs_arg_type |
2dc8dd17 | 5585 | #undef elf_backend_obj_attrs_section_type |
1942a048 | 5586 | #define elf_backend_obj_attrs_section_type SHT_RISCV_ATTRIBUTES |
2dc8dd17 | 5587 | #undef elf_backend_obj_attrs_section |
fbc95f1e | 5588 | #define elf_backend_obj_attrs_section RISCV_ATTRIBUTES_SECTION_NAME |
2dc8dd17 | 5589 | |
e23eba97 | 5590 | #include "elfNN-target.h" |