1 /* Lattice Mico32-specific support for 32-bit ELF
2 Copyright (C) 2008-2024 Free Software Foundation, Inc.
3 Contributed by Jon Beniston <jon@beniston.com>
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
21
22 #include "sysdep.h"
23 #include "bfd.h"
24 #include "libbfd.h"
25 #include "elf-bfd.h"
26 #include "elf/lm32.h"
27
28 #define DEFAULT_STACK_SIZE 0x20000
29
30 #define PLT_ENTRY_SIZE 20
31
32 #define PLT0_ENTRY_WORD0 0
33 #define PLT0_ENTRY_WORD1 0
34 #define PLT0_ENTRY_WORD2 0
35 #define PLT0_ENTRY_WORD3 0
36 #define PLT0_ENTRY_WORD4 0
37
38 #define PLT0_PIC_ENTRY_WORD0 0
39 #define PLT0_PIC_ENTRY_WORD1 0
40 #define PLT0_PIC_ENTRY_WORD2 0
41 #define PLT0_PIC_ENTRY_WORD3 0
42 #define PLT0_PIC_ENTRY_WORD4 0
43
44 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
45
46 extern const bfd_target lm32_elf32_fdpic_vec;
47
48 #define IS_FDPIC(bfd) ((bfd)->xvec == &lm32_elf32_fdpic_vec)
49
50 static bfd_reloc_status_type lm32_elf_gprel_reloc
51 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
52
53 /* lm32 ELF linker hash table. */
54
55 struct elf_lm32_link_hash_table
56 {
57 struct elf_link_hash_table root;
58
59 /* Short-cuts to get to dynamic linker sections. */
60 asection *sfixup32;
61 asection *sdynbss;
62 asection *srelbss;
63
64 int relocs32;
65 };
66
67 /* Get the lm32 ELF linker hash table from a link_info structure. */
68
69 #define lm32_elf_hash_table(p) \
70 ((is_elf_hash_table ((p)->hash) \
71 && elf_hash_table_id (elf_hash_table (p)) == LM32_ELF_DATA) \
72 ? (struct elf_lm32_link_hash_table *) (p)->hash : NULL)
73
74 #define lm32fdpic_got_section(info) \
75 (lm32_elf_hash_table (info)->root.sgot)
76 #define lm32fdpic_gotrel_section(info) \
77 (lm32_elf_hash_table (info)->root.srelgot)
78 #define lm32fdpic_fixup32_section(info) \
79 (lm32_elf_hash_table (info)->sfixup32)
80
81 struct weak_symbol_list
82 {
83 const char *name;
84 struct weak_symbol_list *next;
85 };
86
87 /* Create an lm32 ELF linker hash table. */
88
89 static struct bfd_link_hash_table *
lm32_elf_link_hash_table_create(bfd * abfd)90 lm32_elf_link_hash_table_create (bfd *abfd)
91 {
92 struct elf_lm32_link_hash_table *ret;
93 size_t amt = sizeof (struct elf_lm32_link_hash_table);
94
95 ret = bfd_zmalloc (amt);
96 if (ret == NULL)
97 return NULL;
98
99 if (!_bfd_elf_link_hash_table_init (&ret->root, abfd,
100 _bfd_elf_link_hash_newfunc,
101 sizeof (struct elf_link_hash_entry),
102 LM32_ELF_DATA))
103 {
104 free (ret);
105 return NULL;
106 }
107
108 return &ret->root.root;
109 }
110
111 /* Add a fixup to the ROFIXUP section. */
112
113 static bfd_vma
_lm32fdpic_add_rofixup(bfd * output_bfd,asection * rofixup,bfd_vma relocation)114 _lm32fdpic_add_rofixup (bfd *output_bfd, asection *rofixup, bfd_vma relocation)
115 {
116 bfd_vma fixup_offset;
117
118 if (rofixup->flags & SEC_EXCLUDE)
119 return -1;
120
121 fixup_offset = rofixup->reloc_count * 4;
122 if (rofixup->contents)
123 {
124 BFD_ASSERT (fixup_offset < rofixup->size);
125 if (fixup_offset < rofixup->size)
126 bfd_put_32 (output_bfd, relocation, rofixup->contents + fixup_offset);
127 }
128 rofixup->reloc_count++;
129
130 return fixup_offset;
131 }
132
133 /* Create .rofixup sections in DYNOBJ, and set up
134 shortcuts to them in our hash table. */
135
136 static bool
create_rofixup_section(bfd * dynobj,struct bfd_link_info * info)137 create_rofixup_section (bfd *dynobj, struct bfd_link_info *info)
138 {
139 struct elf_lm32_link_hash_table *htab;
140 htab = lm32_elf_hash_table (info);
141
142 if (htab == NULL)
143 return false;
144
145 /* Fixup section for R_LM32_32 relocs. */
146 lm32fdpic_fixup32_section (info)
147 = bfd_make_section_anyway_with_flags (dynobj,
148 ".rofixup",
149 (SEC_ALLOC
150 | SEC_LOAD
151 | SEC_HAS_CONTENTS
152 | SEC_IN_MEMORY
153 | SEC_LINKER_CREATED
154 | SEC_READONLY));
155 if (lm32fdpic_fixup32_section (info) == NULL
156 || !bfd_set_section_alignment (lm32fdpic_fixup32_section (info), 2))
157 return false;
158
159 return true;
160 }
161
162 static reloc_howto_type lm32_elf_howto_table [] =
163 {
164 /* This reloc does nothing. */
165 HOWTO (R_LM32_NONE, /* type */
166 0, /* rightshift */
167 0, /* size */
168 0, /* bitsize */
169 false, /* pc_relative */
170 0, /* bitpos */
171 complain_overflow_dont, /* complain_on_overflow */
172 bfd_elf_generic_reloc, /* special_function */
173 "R_LM32_NONE", /* name */
174 false, /* partial_inplace */
175 0, /* src_mask */
176 0, /* dst_mask */
177 false), /* pcrel_offset */
178
179 /* An 8 bit absolute relocation. */
180 HOWTO (R_LM32_8, /* type */
181 0, /* rightshift */
182 1, /* size */
183 8, /* bitsize */
184 false, /* pc_relative */
185 0, /* bitpos */
186 complain_overflow_bitfield,/* complain_on_overflow */
187 bfd_elf_generic_reloc, /* special_function */
188 "R_LM32_8", /* name */
189 false, /* partial_inplace */
190 0, /* src_mask */
191 0xff, /* dst_mask */
192 false), /* pcrel_offset */
193
194 /* A 16 bit absolute relocation. */
195 HOWTO (R_LM32_16, /* type */
196 0, /* rightshift */
197 2, /* size */
198 16, /* bitsize */
199 false, /* pc_relative */
200 0, /* bitpos */
201 complain_overflow_bitfield,/* complain_on_overflow */
202 bfd_elf_generic_reloc, /* special_function */
203 "R_LM32_16", /* name */
204 false, /* partial_inplace */
205 0, /* src_mask */
206 0xffff, /* dst_mask */
207 false), /* pcrel_offset */
208
209 /* A 32 bit absolute relocation. */
210 HOWTO (R_LM32_32, /* type */
211 0, /* rightshift */
212 4, /* size */
213 32, /* bitsize */
214 false, /* pc_relative */
215 0, /* bitpos */
216 complain_overflow_bitfield,/* complain_on_overflow */
217 bfd_elf_generic_reloc, /* special_function */
218 "R_LM32_32", /* name */
219 false, /* partial_inplace */
220 0, /* src_mask */
221 0xffffffff, /* dst_mask */
222 false), /* pcrel_offset */
223
224 HOWTO (R_LM32_HI16, /* type */
225 16, /* rightshift */
226 4, /* size */
227 16, /* bitsize */
228 false, /* pc_relative */
229 0, /* bitpos */
230 complain_overflow_bitfield,/* complain_on_overflow */
231 bfd_elf_generic_reloc, /* special_function */
232 "R_LM32_HI16", /* name */
233 false, /* partial_inplace */
234 0, /* src_mask */
235 0xffff, /* dst_mask */
236 false), /* pcrel_offset */
237
238 HOWTO (R_LM32_LO16, /* type */
239 0, /* rightshift */
240 4, /* size */
241 16, /* bitsize */
242 false, /* pc_relative */
243 0, /* bitpos */
244 complain_overflow_dont, /* complain_on_overflow */
245 bfd_elf_generic_reloc, /* special_function */
246 "R_LM32_LO16", /* name */
247 false, /* partial_inplace */
248 0, /* src_mask */
249 0xffff, /* dst_mask */
250 false), /* pcrel_offset */
251
252 HOWTO (R_LM32_GPREL16, /* type */
253 0, /* rightshift */
254 4, /* size */
255 16, /* bitsize */
256 false, /* pc_relative */
257 0, /* bitpos */
258 complain_overflow_dont, /* complain_on_overflow */
259 lm32_elf_gprel_reloc, /* special_function */
260 "R_LM32_GPREL16", /* name */
261 false, /* partial_inplace */
262 0, /* src_mask */
263 0xffff, /* dst_mask */
264 false), /* pcrel_offset */
265
266 HOWTO (R_LM32_CALL, /* type */
267 2, /* rightshift */
268 4, /* size */
269 26, /* bitsize */
270 true, /* pc_relative */
271 0, /* bitpos */
272 complain_overflow_signed, /* complain_on_overflow */
273 bfd_elf_generic_reloc, /* special_function */
274 "R_LM32_CALL", /* name */
275 false, /* partial_inplace */
276 0, /* src_mask */
277 0x3ffffff, /* dst_mask */
278 true), /* pcrel_offset */
279
280 HOWTO (R_LM32_BRANCH, /* type */
281 2, /* rightshift */
282 4, /* size */
283 16, /* bitsize */
284 true, /* pc_relative */
285 0, /* bitpos */
286 complain_overflow_signed, /* complain_on_overflow */
287 bfd_elf_generic_reloc, /* special_function */
288 "R_LM32_BRANCH", /* name */
289 false, /* partial_inplace */
290 0, /* src_mask */
291 0xffff, /* dst_mask */
292 true), /* pcrel_offset */
293
294 /* GNU extension to record C++ vtable hierarchy. */
295 HOWTO (R_LM32_GNU_VTINHERIT, /* type */
296 0, /* rightshift */
297 4, /* size */
298 0, /* bitsize */
299 false, /* pc_relative */
300 0, /* bitpos */
301 complain_overflow_dont, /* complain_on_overflow */
302 NULL, /* special_function */
303 "R_LM32_GNU_VTINHERIT", /* name */
304 false, /* partial_inplace */
305 0, /* src_mask */
306 0, /* dst_mask */
307 false), /* pcrel_offset */
308
309 /* GNU extension to record C++ vtable member usage. */
310 HOWTO (R_LM32_GNU_VTENTRY, /* type */
311 0, /* rightshift */
312 4, /* size */
313 0, /* bitsize */
314 false, /* pc_relative */
315 0, /* bitpos */
316 complain_overflow_dont, /* complain_on_overflow */
317 _bfd_elf_rel_vtable_reloc_fn,/* special_function */
318 "R_LM32_GNU_VTENTRY", /* name */
319 false, /* partial_inplace */
320 0, /* src_mask */
321 0, /* dst_mask */
322 false), /* pcrel_offset */
323
324 HOWTO (R_LM32_16_GOT, /* type */
325 0, /* rightshift */
326 4, /* size */
327 16, /* bitsize */
328 false, /* pc_relative */
329 0, /* bitpos */
330 complain_overflow_signed, /* complain_on_overflow */
331 bfd_elf_generic_reloc, /* special_function */
332 "R_LM32_16_GOT", /* name */
333 false, /* partial_inplace */
334 0, /* src_mask */
335 0xffff, /* dst_mask */
336 false), /* pcrel_offset */
337
338 HOWTO (R_LM32_GOTOFF_HI16, /* type */
339 16, /* rightshift */
340 4, /* size */
341 16, /* bitsize */
342 false, /* pc_relative */
343 0, /* bitpos */
344 complain_overflow_dont, /* complain_on_overflow */
345 bfd_elf_generic_reloc, /* special_function */
346 "R_LM32_GOTOFF_HI16", /* name */
347 false, /* partial_inplace */
348 0xffff, /* src_mask */
349 0xffff, /* dst_mask */
350 false), /* pcrel_offset */
351
352 HOWTO (R_LM32_GOTOFF_LO16, /* type */
353 0, /* rightshift */
354 4, /* size */
355 16, /* bitsize */
356 false, /* pc_relative */
357 0, /* bitpos */
358 complain_overflow_dont, /* complain_on_overflow */
359 bfd_elf_generic_reloc, /* special_function */
360 "R_LM32_GOTOFF_LO16", /* name */
361 false, /* partial_inplace */
362 0xffff, /* src_mask */
363 0xffff, /* dst_mask */
364 false), /* pcrel_offset */
365
366 HOWTO (R_LM32_COPY, /* type */
367 0, /* rightshift */
368 4, /* size */
369 32, /* bitsize */
370 false, /* pc_relative */
371 0, /* bitpos */
372 complain_overflow_bitfield, /* complain_on_overflow */
373 bfd_elf_generic_reloc, /* special_function */
374 "R_LM32_COPY", /* name */
375 false, /* partial_inplace */
376 0xffffffff, /* src_mask */
377 0xffffffff, /* dst_mask */
378 false), /* pcrel_offset */
379
380 HOWTO (R_LM32_GLOB_DAT, /* type */
381 0, /* rightshift */
382 4, /* size */
383 32, /* bitsize */
384 false, /* pc_relative */
385 0, /* bitpos */
386 complain_overflow_bitfield, /* complain_on_overflow */
387 bfd_elf_generic_reloc, /* special_function */
388 "R_LM32_GLOB_DAT", /* name */
389 false, /* partial_inplace */
390 0xffffffff, /* src_mask */
391 0xffffffff, /* dst_mask */
392 false), /* pcrel_offset */
393
394 HOWTO (R_LM32_JMP_SLOT, /* type */
395 0, /* rightshift */
396 4, /* size */
397 32, /* bitsize */
398 false, /* pc_relative */
399 0, /* bitpos */
400 complain_overflow_bitfield, /* complain_on_overflow */
401 bfd_elf_generic_reloc, /* special_function */
402 "R_LM32_JMP_SLOT", /* name */
403 false, /* partial_inplace */
404 0xffffffff, /* src_mask */
405 0xffffffff, /* dst_mask */
406 false), /* pcrel_offset */
407
408 HOWTO (R_LM32_RELATIVE, /* type */
409 0, /* rightshift */
410 4, /* size */
411 32, /* bitsize */
412 false, /* pc_relative */
413 0, /* bitpos */
414 complain_overflow_bitfield, /* complain_on_overflow */
415 bfd_elf_generic_reloc, /* special_function */
416 "R_LM32_RELATIVE", /* name */
417 false, /* partial_inplace */
418 0xffffffff, /* src_mask */
419 0xffffffff, /* dst_mask */
420 false), /* pcrel_offset */
421
422 };
423
424 /* Map BFD reloc types to lm32 ELF reloc types. */
425
426 struct lm32_reloc_map
427 {
428 bfd_reloc_code_real_type bfd_reloc_val;
429 unsigned char elf_reloc_val;
430 };
431
432 static const struct lm32_reloc_map lm32_reloc_map[] =
433 {
434 { BFD_RELOC_NONE, R_LM32_NONE },
435 { BFD_RELOC_8, R_LM32_8 },
436 { BFD_RELOC_16, R_LM32_16 },
437 { BFD_RELOC_32, R_LM32_32 },
438 { BFD_RELOC_HI16, R_LM32_HI16 },
439 { BFD_RELOC_LO16, R_LM32_LO16 },
440 { BFD_RELOC_GPREL16, R_LM32_GPREL16 },
441 { BFD_RELOC_LM32_CALL, R_LM32_CALL },
442 { BFD_RELOC_LM32_BRANCH, R_LM32_BRANCH },
443 { BFD_RELOC_VTABLE_INHERIT, R_LM32_GNU_VTINHERIT },
444 { BFD_RELOC_VTABLE_ENTRY, R_LM32_GNU_VTENTRY },
445 { BFD_RELOC_LM32_16_GOT, R_LM32_16_GOT },
446 { BFD_RELOC_LM32_GOTOFF_HI16, R_LM32_GOTOFF_HI16 },
447 { BFD_RELOC_LM32_GOTOFF_LO16, R_LM32_GOTOFF_LO16 },
448 { BFD_RELOC_LM32_COPY, R_LM32_COPY },
449 { BFD_RELOC_LM32_GLOB_DAT, R_LM32_GLOB_DAT },
450 { BFD_RELOC_LM32_JMP_SLOT, R_LM32_JMP_SLOT },
451 { BFD_RELOC_LM32_RELATIVE, R_LM32_RELATIVE },
452 };
453
454 static reloc_howto_type *
lm32_reloc_type_lookup(bfd * abfd ATTRIBUTE_UNUSED,bfd_reloc_code_real_type code)455 lm32_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
456 bfd_reloc_code_real_type code)
457 {
458 unsigned int i;
459
460 for (i = 0; i < sizeof (lm32_reloc_map) / sizeof (lm32_reloc_map[0]); i++)
461 if (lm32_reloc_map[i].bfd_reloc_val == code)
462 return &lm32_elf_howto_table[lm32_reloc_map[i].elf_reloc_val];
463 return NULL;
464 }
465
466 static reloc_howto_type *
lm32_reloc_name_lookup(bfd * abfd ATTRIBUTE_UNUSED,const char * r_name)467 lm32_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
468 const char *r_name)
469 {
470 unsigned int i;
471
472 for (i = 0;
473 i < sizeof (lm32_elf_howto_table) / sizeof (lm32_elf_howto_table[0]);
474 i++)
475 if (lm32_elf_howto_table[i].name != NULL
476 && strcasecmp (lm32_elf_howto_table[i].name, r_name) == 0)
477 return &lm32_elf_howto_table[i];
478
479 return NULL;
480 }
481
482
483 /* Set the howto pointer for an Lattice Mico32 ELF reloc. */
484
485 static bool
lm32_info_to_howto_rela(bfd * abfd,arelent * cache_ptr,Elf_Internal_Rela * dst)486 lm32_info_to_howto_rela (bfd *abfd,
487 arelent *cache_ptr,
488 Elf_Internal_Rela *dst)
489 {
490 unsigned int r_type;
491
492 r_type = ELF32_R_TYPE (dst->r_info);
493 if (r_type >= (unsigned int) R_LM32_max)
494 {
495 /* xgettext:c-format */
496 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
497 abfd, r_type);
498 bfd_set_error (bfd_error_bad_value);
499 return false;
500 }
501 cache_ptr->howto = &lm32_elf_howto_table[r_type];
502 return true;
503 }
504
505 /* Set the right machine number for an Lattice Mico32 ELF file. */
506
507 static bool
lm32_elf_object_p(bfd * abfd)508 lm32_elf_object_p (bfd *abfd)
509 {
510 return bfd_default_set_arch_mach (abfd, bfd_arch_lm32, bfd_mach_lm32);
511 }
512
513 /* Set machine type flags just before file is written out. */
514
515 static bool
lm32_elf_final_write_processing(bfd * abfd)516 lm32_elf_final_write_processing (bfd *abfd)
517 {
518 elf_elfheader (abfd)->e_machine = EM_LATTICEMICO32;
519 elf_elfheader (abfd)->e_flags &=~ EF_LM32_MACH;
520 switch (bfd_get_mach (abfd))
521 {
522 case bfd_mach_lm32:
523 elf_elfheader (abfd)->e_flags |= E_LM32_MACH;
524 break;
525 default:
526 abort ();
527 }
528 return _bfd_elf_final_write_processing (abfd);
529 }
530
531 /* Set the GP value for OUTPUT_BFD. Returns FALSE if this is a
532 dangerous relocation. */
533
534 static bool
lm32_elf_assign_gp(bfd * output_bfd,bfd_vma * pgp)535 lm32_elf_assign_gp (bfd *output_bfd, bfd_vma *pgp)
536 {
537 unsigned int count;
538 asymbol **sym;
539 unsigned int i;
540
541 /* If we've already figured out what GP will be, just return it. */
542 *pgp = _bfd_get_gp_value (output_bfd);
543 if (*pgp)
544 return true;
545
546 count = bfd_get_symcount (output_bfd);
547 sym = bfd_get_outsymbols (output_bfd);
548
549 /* The linker script will have created a symbol named `_gp' with the
550 appropriate value. */
551 if (sym == NULL)
552 i = count;
553 else
554 {
555 for (i = 0; i < count; i++, sym++)
556 {
557 const char *name;
558
559 name = bfd_asymbol_name (*sym);
560 if (*name == '_' && strcmp (name, "_gp") == 0)
561 {
562 *pgp = bfd_asymbol_value (*sym);
563 _bfd_set_gp_value (output_bfd, *pgp);
564 break;
565 }
566 }
567 }
568
569 if (i >= count)
570 {
571 /* Only get the error once. */
572 *pgp = 4;
573 _bfd_set_gp_value (output_bfd, *pgp);
574 return false;
575 }
576
577 return true;
578 }
579
580 /* We have to figure out the gp value, so that we can adjust the
581 symbol value correctly. We look up the symbol _gp in the output
582 BFD. If we can't find it, we're stuck. We cache it in the ELF
583 target data. We don't need to adjust the symbol value for an
584 external symbol if we are producing relocatable output. */
585
586 static bfd_reloc_status_type
lm32_elf_final_gp(bfd * output_bfd,asymbol * symbol,bool relocatable,char ** error_message,bfd_vma * pgp)587 lm32_elf_final_gp (bfd *output_bfd, asymbol *symbol, bool relocatable,
588 char **error_message, bfd_vma *pgp)
589 {
590 if (bfd_is_und_section (symbol->section) && !relocatable)
591 {
592 *pgp = 0;
593 return bfd_reloc_undefined;
594 }
595
596 *pgp = _bfd_get_gp_value (output_bfd);
597 if (*pgp == 0 && (!relocatable || (symbol->flags & BSF_SECTION_SYM) != 0))
598 {
599 if (relocatable)
600 {
601 /* Make up a value. */
602 *pgp = symbol->section->output_section->vma + 0x4000;
603 _bfd_set_gp_value (output_bfd, *pgp);
604 }
605 else if (!lm32_elf_assign_gp (output_bfd, pgp))
606 {
607 *error_message =
608 (char *)
609 _("global pointer relative relocation when _gp not defined");
610 return bfd_reloc_dangerous;
611 }
612 }
613
614 return bfd_reloc_ok;
615 }
616
617 static bfd_reloc_status_type
lm32_elf_do_gprel_relocate(bfd * abfd,reloc_howto_type * howto,asection * input_section ATTRIBUTE_UNUSED,bfd_byte * data,bfd_vma offset,bfd_vma symbol_value,bfd_vma addend)618 lm32_elf_do_gprel_relocate (bfd *abfd,
619 reloc_howto_type *howto,
620 asection *input_section ATTRIBUTE_UNUSED,
621 bfd_byte *data,
622 bfd_vma offset,
623 bfd_vma symbol_value,
624 bfd_vma addend)
625 {
626 return _bfd_final_link_relocate (howto, abfd, input_section,
627 data, offset, symbol_value, addend);
628 }
629
630 static bfd_reloc_status_type
lm32_elf_gprel_reloc(bfd * abfd,arelent * reloc_entry,asymbol * symbol,void * data,asection * input_section,bfd * output_bfd,char ** msg)631 lm32_elf_gprel_reloc (bfd *abfd,
632 arelent *reloc_entry,
633 asymbol *symbol,
634 void *data,
635 asection *input_section,
636 bfd *output_bfd,
637 char **msg)
638 {
639 bfd_vma relocation;
640 bfd_vma gp;
641 bfd_reloc_status_type r;
642
643 if (output_bfd != (bfd *) NULL
644 && (symbol->flags & BSF_SECTION_SYM) == 0
645 && (!reloc_entry->howto->partial_inplace || reloc_entry->addend == 0))
646 {
647 reloc_entry->address += input_section->output_offset;
648 return bfd_reloc_ok;
649 }
650
651 if (output_bfd != NULL)
652 return bfd_reloc_ok;
653
654 relocation = symbol->value
655 + symbol->section->output_section->vma + symbol->section->output_offset;
656
657 if ((r =
658 lm32_elf_final_gp (abfd, symbol, false, msg, &gp)) == bfd_reloc_ok)
659 {
660 relocation = relocation + reloc_entry->addend - gp;
661 reloc_entry->addend = 0;
662 if ((signed) relocation < -32768 || (signed) relocation > 32767)
663 {
664 *msg = _("global pointer relative address out of range");
665 r = bfd_reloc_outofrange;
666 }
667 else
668 {
669 r = lm32_elf_do_gprel_relocate (abfd, reloc_entry->howto,
670 input_section,
671 data, reloc_entry->address,
672 relocation, reloc_entry->addend);
673 }
674 }
675
676 return r;
677 }
678
679 /* Find the segment number in which OSEC, and output section, is
680 located. */
681
682 static unsigned
_lm32fdpic_osec_to_segment(bfd * output_bfd,asection * osec)683 _lm32fdpic_osec_to_segment (bfd *output_bfd, asection *osec)
684 {
685 struct elf_segment_map *m;
686 Elf_Internal_Phdr *p;
687
688 /* Find the segment that contains the output_section. */
689 for (m = elf_seg_map (output_bfd), p = elf_tdata (output_bfd)->phdr;
690 m != NULL;
691 m = m->next, p++)
692 {
693 int i;
694
695 for (i = m->count - 1; i >= 0; i--)
696 if (m->sections[i] == osec)
697 break;
698
699 if (i >= 0)
700 break;
701 }
702
703 return p - elf_tdata (output_bfd)->phdr;
704 }
705
706 /* Determine if an output section is read-only. */
707
708 inline static bool
_lm32fdpic_osec_readonly_p(bfd * output_bfd,asection * osec)709 _lm32fdpic_osec_readonly_p (bfd *output_bfd, asection *osec)
710 {
711 unsigned seg = _lm32fdpic_osec_to_segment (output_bfd, osec);
712
713 return ! (elf_tdata (output_bfd)->phdr[seg].p_flags & PF_W);
714 }
715
716 /* Relocate a section */
717
718 static int
lm32_elf_relocate_section(bfd * output_bfd,struct bfd_link_info * info,bfd * input_bfd,asection * input_section,bfd_byte * contents,Elf_Internal_Rela * relocs,Elf_Internal_Sym * local_syms,asection ** local_sections)719 lm32_elf_relocate_section (bfd *output_bfd,
720 struct bfd_link_info *info,
721 bfd *input_bfd,
722 asection *input_section,
723 bfd_byte *contents,
724 Elf_Internal_Rela *relocs,
725 Elf_Internal_Sym *local_syms,
726 asection **local_sections)
727 {
728 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
729 struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (input_bfd);
730 Elf_Internal_Rela *rel, *relend;
731 struct elf_lm32_link_hash_table *htab = lm32_elf_hash_table (info);
732 bfd_vma *local_got_offsets;
733 asection *sgot;
734
735 if (htab == NULL)
736 return false;
737
738 local_got_offsets = elf_local_got_offsets (input_bfd);
739
740 sgot = htab->root.sgot;
741
742 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
743 sym_hashes = elf_sym_hashes (input_bfd);
744
745 rel = relocs;
746 relend = relocs + input_section->reloc_count;
747 for (; rel < relend; rel++)
748 {
749 reloc_howto_type *howto;
750 unsigned int r_type;
751 unsigned long r_symndx;
752 Elf_Internal_Sym *sym;
753 asection *sec;
754 struct elf_link_hash_entry *h;
755 bfd_vma relocation;
756 bfd_vma gp;
757 bfd_reloc_status_type r;
758 const char *name = NULL;
759
760 r_symndx = ELF32_R_SYM (rel->r_info);
761 r_type = ELF32_R_TYPE (rel->r_info);
762
763 if (r_type == R_LM32_GNU_VTENTRY
764 || r_type == R_LM32_GNU_VTINHERIT )
765 continue;
766
767 h = NULL;
768 sym = NULL;
769 sec = NULL;
770
771 howto = lm32_elf_howto_table + r_type;
772
773 if (r_symndx < symtab_hdr->sh_info)
774 {
775 /* It's a local symbol. */
776 sym = local_syms + r_symndx;
777 sec = local_sections[r_symndx];
778 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
779 name = bfd_elf_string_from_elf_section
780 (input_bfd, symtab_hdr->sh_link, sym->st_name);
781 name = name == NULL ? bfd_section_name (sec) : name;
782 }
783 else
784 {
785 /* It's a global symbol. */
786 bool unresolved_reloc;
787 bool warned, ignored;
788
789 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
790 r_symndx, symtab_hdr, sym_hashes,
791 h, sec, relocation,
792 unresolved_reloc, warned, ignored);
793 name = h->root.root.string;
794 }
795
796 if (sec != NULL && discarded_section (sec))
797 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
798 rel, 1, relend, howto, 0, contents);
799
800 if (bfd_link_relocatable (info))
801 {
802 /* This is a relocatable link. We don't have to change
803 anything, unless the reloc is against a section symbol,
804 in which case we have to adjust according to where the
805 section symbol winds up in the output section. */
806 if (sym == NULL || ELF_ST_TYPE (sym->st_info) != STT_SECTION)
807 continue;
808
809 /* If partial_inplace, we need to store any additional addend
810 back in the section. */
811 if (! howto->partial_inplace)
812 continue;
813
814 /* Shouldn't reach here. */
815 abort ();
816 r = bfd_reloc_ok;
817 }
818 else
819 {
820 switch (howto->type)
821 {
822 case R_LM32_GPREL16:
823 if (!lm32_elf_assign_gp (output_bfd, &gp))
824 r = bfd_reloc_dangerous;
825 else
826 {
827 relocation = relocation + rel->r_addend - gp;
828 rel->r_addend = 0;
829 if ((signed)relocation < -32768 || (signed)relocation > 32767)
830 r = bfd_reloc_outofrange;
831 else
832 {
833 r = _bfd_final_link_relocate (howto, input_bfd,
834 input_section, contents,
835 rel->r_offset, relocation,
836 rel->r_addend);
837 }
838 }
839 break;
840 case R_LM32_16_GOT:
841 /* Relocation is to the entry for this symbol in the global
842 offset table. */
843 BFD_ASSERT (sgot != NULL);
844 if (h != NULL)
845 {
846 bool dyn;
847 bfd_vma off;
848
849 off = h->got.offset;
850 BFD_ASSERT (off != (bfd_vma) -1);
851
852 dyn = htab->root.dynamic_sections_created;
853 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
854 bfd_link_pic (info),
855 h)
856 || (bfd_link_pic (info)
857 && (info->symbolic
858 || h->dynindx == -1
859 || h->forced_local)
860 && h->def_regular))
861 {
862 /* This is actually a static link, or it is a
863 -Bsymbolic link and the symbol is defined
864 locally, or the symbol was forced to be local
865 because of a version file. We must initialize
866 this entry in the global offset table. Since the
867 offset must always be a multiple of 4, we use the
868 least significant bit to record whether we have
869 initialized it already.
870
871 When doing a dynamic link, we create a .rela.got
872 relocation entry to initialize the value. This
873 is done in the finish_dynamic_symbol routine. */
874 if ((off & 1) != 0)
875 off &= ~1;
876 else
877 {
878 /* Write entry in GOT */
879 bfd_put_32 (output_bfd, relocation,
880 sgot->contents + off);
881 /* Create entry in .rofixup pointing to GOT entry. */
882 if (IS_FDPIC (output_bfd) && h->root.type != bfd_link_hash_undefweak)
883 {
884 _lm32fdpic_add_rofixup (output_bfd,
885 lm32fdpic_fixup32_section
886 (info),
887 sgot->output_section->vma
888 + sgot->output_offset
889 + off);
890 }
891 /* Mark GOT entry as having been written. */
892 h->got.offset |= 1;
893 }
894 }
895
896 relocation = sgot->output_offset + off;
897 }
898 else
899 {
900 bfd_vma off;
901 bfd_byte *loc;
902
903 BFD_ASSERT (local_got_offsets != NULL
904 && local_got_offsets[r_symndx] != (bfd_vma) -1);
905
906 /* Get offset into GOT table. */
907 off = local_got_offsets[r_symndx];
908
909 /* The offset must always be a multiple of 4. We use
910 the least significant bit to record whether we have
911 already processed this entry. */
912 if ((off & 1) != 0)
913 off &= ~1;
914 else
915 {
916 /* Write entry in GOT. */
917 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
918 /* Create entry in .rofixup pointing to GOT entry. */
919 if (IS_FDPIC (output_bfd))
920 {
921 _lm32fdpic_add_rofixup (output_bfd,
922 lm32fdpic_fixup32_section
923 (info),
924 sgot->output_section->vma
925 + sgot->output_offset
926 + off);
927 }
928
929 if (bfd_link_pic (info))
930 {
931 asection *srelgot;
932 Elf_Internal_Rela outrel;
933
934 /* We need to generate a R_LM32_RELATIVE reloc
935 for the dynamic linker. */
936 srelgot = htab->root.srelgot;
937 BFD_ASSERT (srelgot != NULL);
938
939 outrel.r_offset = (sgot->output_section->vma
940 + sgot->output_offset
941 + off);
942 outrel.r_info = ELF32_R_INFO (0, R_LM32_RELATIVE);
943 outrel.r_addend = relocation;
944 loc = srelgot->contents;
945 loc += srelgot->reloc_count * sizeof (Elf32_External_Rela);
946 bfd_elf32_swap_reloca_out (output_bfd, &outrel,loc);
947 ++srelgot->reloc_count;
948 }
949
950 local_got_offsets[r_symndx] |= 1;
951 }
952
953
954 relocation = sgot->output_offset + off;
955 }
956
957 /* Addend should be zero. */
958 if (rel->r_addend != 0)
959 _bfd_error_handler
960 (_("internal error: addend should be zero for %s"),
961 "R_LM32_16_GOT");
962
963 r = _bfd_final_link_relocate (howto,
964 input_bfd,
965 input_section,
966 contents,
967 rel->r_offset,
968 relocation,
969 rel->r_addend);
970 break;
971
972 case R_LM32_GOTOFF_LO16:
973 case R_LM32_GOTOFF_HI16:
974 /* Relocation is offset from GOT. */
975 BFD_ASSERT (sgot != NULL);
976 relocation -= sgot->output_section->vma;
977 /* Account for sign-extension. */
978 if ((r_type == R_LM32_GOTOFF_HI16)
979 && ((relocation + rel->r_addend) & 0x8000))
980 rel->r_addend += 0x10000;
981 r = _bfd_final_link_relocate (howto,
982 input_bfd,
983 input_section,
984 contents,
985 rel->r_offset,
986 relocation,
987 rel->r_addend);
988 break;
989
990 case R_LM32_32:
991 if (IS_FDPIC (output_bfd))
992 {
993 if ((!h) || (h && h->root.type != bfd_link_hash_undefweak))
994 {
995 /* Only create .rofixup entries for relocs in loadable sections. */
996 if ((bfd_section_flags (input_section->output_section)
997 & (SEC_ALLOC | SEC_LOAD)) == (SEC_ALLOC | SEC_LOAD))
998
999 {
1000 /* Check address to be modified is writable. */
1001 if (_lm32fdpic_osec_readonly_p (output_bfd,
1002 input_section
1003 ->output_section))
1004 {
1005 info->callbacks->warning
1006 (info,
1007 _("cannot emit dynamic relocations in read-only section"),
1008 name, input_bfd, input_section, rel->r_offset);
1009 return false;
1010 }
1011 /* Create entry in .rofixup section. */
1012 _lm32fdpic_add_rofixup (output_bfd,
1013 lm32fdpic_fixup32_section (info),
1014 input_section->output_section->vma
1015 + input_section->output_offset
1016 + rel->r_offset);
1017 }
1018 }
1019 }
1020 /* Fall through. */
1021
1022 default:
1023 r = _bfd_final_link_relocate (howto,
1024 input_bfd,
1025 input_section,
1026 contents,
1027 rel->r_offset,
1028 relocation,
1029 rel->r_addend);
1030 break;
1031 }
1032 }
1033
1034 if (r != bfd_reloc_ok)
1035 {
1036 const char *msg = NULL;
1037 arelent bfd_reloc;
1038
1039 if (! lm32_info_to_howto_rela (input_bfd, &bfd_reloc, rel))
1040 continue;
1041 howto = bfd_reloc.howto;
1042
1043 if (h != NULL)
1044 name = h->root.root.string;
1045 else
1046 {
1047 name = (bfd_elf_string_from_elf_section
1048 (input_bfd, symtab_hdr->sh_link, sym->st_name));
1049 if (name == NULL || *name == '\0')
1050 name = bfd_section_name (sec);
1051 }
1052
1053 switch (r)
1054 {
1055 case bfd_reloc_overflow:
1056 if ((h != NULL)
1057 && (h->root.type == bfd_link_hash_undefweak))
1058 break;
1059 (*info->callbacks->reloc_overflow)
1060 (info, (h ? &h->root : NULL), name, howto->name,
1061 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
1062 break;
1063
1064 case bfd_reloc_undefined:
1065 (*info->callbacks->undefined_symbol)
1066 (info, name, input_bfd, input_section, rel->r_offset, true);
1067 break;
1068
1069 case bfd_reloc_outofrange:
1070 msg = _("internal error: out of range error");
1071 goto common_error;
1072
1073 case bfd_reloc_notsupported:
1074 msg = _("internal error: unsupported relocation error");
1075 goto common_error;
1076
1077 case bfd_reloc_dangerous:
1078 msg = _("internal error: dangerous error");
1079 goto common_error;
1080
1081 default:
1082 msg = _("internal error: unknown error");
1083 /* fall through */
1084
1085 common_error:
1086 (*info->callbacks->warning) (info, msg, name, input_bfd,
1087 input_section, rel->r_offset);
1088 break;
1089 }
1090 }
1091 }
1092
1093 return true;
1094 }
1095
1096 static asection *
lm32_elf_gc_mark_hook(asection * sec,struct bfd_link_info * info,Elf_Internal_Rela * rel,struct elf_link_hash_entry * h,Elf_Internal_Sym * sym)1097 lm32_elf_gc_mark_hook (asection *sec,
1098 struct bfd_link_info *info,
1099 Elf_Internal_Rela *rel,
1100 struct elf_link_hash_entry *h,
1101 Elf_Internal_Sym *sym)
1102 {
1103 if (h != NULL)
1104 switch (ELF32_R_TYPE (rel->r_info))
1105 {
1106 case R_LM32_GNU_VTINHERIT:
1107 case R_LM32_GNU_VTENTRY:
1108 return NULL;
1109 }
1110
1111 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1112 }
1113
1114 /* Look through the relocs for a section during the first phase. */
1115
1116 static bool
lm32_elf_check_relocs(bfd * abfd,struct bfd_link_info * info,asection * sec,const Elf_Internal_Rela * relocs)1117 lm32_elf_check_relocs (bfd *abfd,
1118 struct bfd_link_info *info,
1119 asection *sec,
1120 const Elf_Internal_Rela *relocs)
1121 {
1122 Elf_Internal_Shdr *symtab_hdr;
1123 struct elf_link_hash_entry **sym_hashes;
1124 const Elf_Internal_Rela *rel;
1125 const Elf_Internal_Rela *rel_end;
1126 struct elf_lm32_link_hash_table *htab;
1127 bfd *dynobj;
1128
1129 if (bfd_link_relocatable (info))
1130 return true;
1131
1132 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1133 sym_hashes = elf_sym_hashes (abfd);
1134
1135 htab = lm32_elf_hash_table (info);
1136 if (htab == NULL)
1137 return false;
1138
1139 dynobj = htab->root.dynobj;
1140
1141 rel_end = relocs + sec->reloc_count;
1142 for (rel = relocs; rel < rel_end; rel++)
1143 {
1144 int r_type;
1145 struct elf_link_hash_entry *h;
1146 unsigned long r_symndx;
1147
1148 r_symndx = ELF32_R_SYM (rel->r_info);
1149 r_type = ELF32_R_TYPE (rel->r_info);
1150 if (r_symndx < symtab_hdr->sh_info)
1151 h = NULL;
1152 else
1153 {
1154 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1155 while (h->root.type == bfd_link_hash_indirect
1156 || h->root.type == bfd_link_hash_warning)
1157 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1158 }
1159
1160 /* Some relocs require a global offset table. */
1161 if (htab->root.sgot == NULL)
1162 {
1163 switch (r_type)
1164 {
1165 case R_LM32_16_GOT:
1166 case R_LM32_GOTOFF_HI16:
1167 case R_LM32_GOTOFF_LO16:
1168 if (dynobj == NULL)
1169 htab->root.dynobj = dynobj = abfd;
1170 if (!_bfd_elf_create_got_section (dynobj, info))
1171 return false;
1172 break;
1173 }
1174 }
1175
1176 /* Some relocs require a rofixup table. */
1177 if (IS_FDPIC (abfd))
1178 {
1179 switch (r_type)
1180 {
1181 case R_LM32_32:
1182 /* FDPIC requires a GOT if there is a .rofixup section
1183 (Normal ELF doesn't). */
1184 if (dynobj == NULL)
1185 htab->root.dynobj = dynobj = abfd;
1186 if (!_bfd_elf_create_got_section (dynobj, info))
1187 return false;
1188 /* Create .rofixup section */
1189 if (htab->sfixup32 == NULL)
1190 {
1191 if (! create_rofixup_section (dynobj, info))
1192 return false;
1193 }
1194 break;
1195 case R_LM32_16_GOT:
1196 case R_LM32_GOTOFF_HI16:
1197 case R_LM32_GOTOFF_LO16:
1198 /* Create .rofixup section. */
1199 if (htab->sfixup32 == NULL)
1200 {
1201 if (dynobj == NULL)
1202 htab->root.dynobj = dynobj = abfd;
1203 if (! create_rofixup_section (dynobj, info))
1204 return false;
1205 }
1206 break;
1207 }
1208 }
1209
1210 switch (r_type)
1211 {
1212 case R_LM32_16_GOT:
1213 if (h != NULL)
1214 h->got.refcount += 1;
1215 else
1216 {
1217 bfd_signed_vma *local_got_refcounts;
1218
1219 /* This is a global offset table entry for a local symbol. */
1220 local_got_refcounts = elf_local_got_refcounts (abfd);
1221 if (local_got_refcounts == NULL)
1222 {
1223 bfd_size_type size;
1224
1225 size = symtab_hdr->sh_info;
1226 size *= sizeof (bfd_signed_vma);
1227 local_got_refcounts = bfd_zalloc (abfd, size);
1228 if (local_got_refcounts == NULL)
1229 return false;
1230 elf_local_got_refcounts (abfd) = local_got_refcounts;
1231 }
1232 local_got_refcounts[r_symndx] += 1;
1233 }
1234 break;
1235
1236 /* This relocation describes the C++ object vtable hierarchy.
1237 Reconstruct it for later use during GC. */
1238 case R_LM32_GNU_VTINHERIT:
1239 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1240 return false;
1241 break;
1242
1243 /* This relocation describes which C++ vtable entries are actually
1244 used. Record for later use during GC. */
1245 case R_LM32_GNU_VTENTRY:
1246 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1247 return false;
1248 break;
1249
1250 }
1251 }
1252
1253 return true;
1254 }
1255
1256 /* Finish up the dynamic sections. */
1257
1258 static bool
lm32_elf_finish_dynamic_sections(bfd * output_bfd,struct bfd_link_info * info)1259 lm32_elf_finish_dynamic_sections (bfd *output_bfd,
1260 struct bfd_link_info *info)
1261 {
1262 struct elf_lm32_link_hash_table *htab;
1263 bfd *dynobj;
1264 asection *sdyn;
1265 asection *sgot;
1266
1267 htab = lm32_elf_hash_table (info);
1268 if (htab == NULL)
1269 return false;
1270
1271 dynobj = htab->root.dynobj;
1272
1273 sgot = htab->root.sgotplt;
1274 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
1275
1276 if (htab->root.dynamic_sections_created)
1277 {
1278 asection *splt;
1279 Elf32_External_Dyn *dyncon, *dynconend;
1280
1281 BFD_ASSERT (sgot != NULL && sdyn != NULL);
1282
1283 dyncon = (Elf32_External_Dyn *) sdyn->contents;
1284 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
1285
1286 for (; dyncon < dynconend; dyncon++)
1287 {
1288 Elf_Internal_Dyn dyn;
1289 asection *s;
1290
1291 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
1292
1293 switch (dyn.d_tag)
1294 {
1295 default:
1296 break;
1297
1298 case DT_PLTGOT:
1299 s = htab->root.sgotplt;
1300 goto get_vma;
1301 case DT_JMPREL:
1302 s = htab->root.srelplt;
1303 get_vma:
1304 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
1305 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1306 break;
1307
1308 case DT_PLTRELSZ:
1309 s = htab->root.srelplt;
1310 dyn.d_un.d_val = s->size;
1311 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1312 break;
1313 }
1314 }
1315
1316 /* Fill in the first entry in the procedure linkage table. */
1317 splt = htab->root.splt;
1318 if (splt && splt->size > 0)
1319 {
1320 if (bfd_link_pic (info))
1321 {
1322 bfd_put_32 (output_bfd, PLT0_PIC_ENTRY_WORD0, splt->contents);
1323 bfd_put_32 (output_bfd, PLT0_PIC_ENTRY_WORD1, splt->contents + 4);
1324 bfd_put_32 (output_bfd, PLT0_PIC_ENTRY_WORD2, splt->contents + 8);
1325 bfd_put_32 (output_bfd, PLT0_PIC_ENTRY_WORD3, splt->contents + 12);
1326 bfd_put_32 (output_bfd, PLT0_PIC_ENTRY_WORD4, splt->contents + 16);
1327 }
1328 else
1329 {
1330 unsigned long addr;
1331 /* addr = .got + 4 */
1332 addr = sgot->output_section->vma + sgot->output_offset + 4;
1333 bfd_put_32 (output_bfd,
1334 PLT0_ENTRY_WORD0 | ((addr >> 16) & 0xffff),
1335 splt->contents);
1336 bfd_put_32 (output_bfd,
1337 PLT0_ENTRY_WORD1 | (addr & 0xffff),
1338 splt->contents + 4);
1339 bfd_put_32 (output_bfd, PLT0_ENTRY_WORD2, splt->contents + 8);
1340 bfd_put_32 (output_bfd, PLT0_ENTRY_WORD3, splt->contents + 12);
1341 bfd_put_32 (output_bfd, PLT0_ENTRY_WORD4, splt->contents + 16);
1342 }
1343
1344 elf_section_data (splt->output_section)->this_hdr.sh_entsize =
1345 PLT_ENTRY_SIZE;
1346 }
1347 }
1348
1349 /* Fill in the first three entries in the global offset table. */
1350 if (sgot && sgot->size > 0)
1351 {
1352 if (sdyn == NULL)
1353 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
1354 else
1355 bfd_put_32 (output_bfd,
1356 sdyn->output_section->vma + sdyn->output_offset,
1357 sgot->contents);
1358 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
1359 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
1360
1361 /* FIXME: This can be null if create_dynamic_sections wasn't called. */
1362 if (elf_section_data (sgot->output_section) != NULL)
1363 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
1364 }
1365
1366 if (lm32fdpic_fixup32_section (info))
1367 {
1368 struct elf_link_hash_entry *hgot = elf_hash_table (info)->hgot;
1369 bfd_vma got_value = hgot->root.u.def.value
1370 + hgot->root.u.def.section->output_section->vma
1371 + hgot->root.u.def.section->output_offset;
1372 struct bfd_link_hash_entry *hend;
1373
1374 /* Last entry is pointer to GOT. */
1375 _lm32fdpic_add_rofixup (output_bfd, lm32fdpic_fixup32_section (info), got_value);
1376
1377 /* Check we wrote enough entries. */
1378 if (lm32fdpic_fixup32_section (info)->size
1379 != (lm32fdpic_fixup32_section (info)->reloc_count * 4))
1380 {
1381 _bfd_error_handler
1382 ("LINKER BUG: .rofixup section size mismatch: size/4 %" PRId64
1383 " != relocs %d",
1384 (int64_t) (lm32fdpic_fixup32_section (info)->size / 4),
1385 lm32fdpic_fixup32_section (info)->reloc_count);
1386 return false;
1387 }
1388
1389 hend = bfd_link_hash_lookup (info->hash, "__ROFIXUP_END__",
1390 false, false, true);
1391 if (hend
1392 && (hend->type == bfd_link_hash_defined
1393 || hend->type == bfd_link_hash_defweak)
1394 && hend->u.def.section->output_section != NULL)
1395 {
1396 bfd_vma value =
1397 lm32fdpic_fixup32_section (info)->output_section->vma
1398 + lm32fdpic_fixup32_section (info)->output_offset
1399 + lm32fdpic_fixup32_section (info)->size
1400 - hend->u.def.section->output_section->vma
1401 - hend->u.def.section->output_offset;
1402 BFD_ASSERT (hend->u.def.value == value);
1403 if (hend->u.def.value != value)
1404 {
1405 _bfd_error_handler
1406 ("LINKER BUG: .rofixup section hend->u.def.value != value: %"
1407 PRId64 " != %" PRId64,
1408 (int64_t) hend->u.def.value, (int64_t) value);
1409 return false;
1410 }
1411 }
1412 }
1413
1414 return true;
1415 }
1416
1417 /* Finish up dynamic symbol handling. We set the contents of various
1418 dynamic sections here. */
1419
1420 static bool
lm32_elf_finish_dynamic_symbol(bfd * output_bfd,struct bfd_link_info * info,struct elf_link_hash_entry * h,Elf_Internal_Sym * sym)1421 lm32_elf_finish_dynamic_symbol (bfd *output_bfd,
1422 struct bfd_link_info *info,
1423 struct elf_link_hash_entry *h,
1424 Elf_Internal_Sym *sym)
1425 {
1426 struct elf_lm32_link_hash_table *htab;
1427 bfd_byte *loc;
1428
1429 htab = lm32_elf_hash_table (info);
1430
1431 if (h->plt.offset != (bfd_vma) -1)
1432 {
1433 asection *splt;
1434 asection *sgot;
1435 asection *srela;
1436
1437 bfd_vma plt_index;
1438 bfd_vma got_offset;
1439 Elf_Internal_Rela rela;
1440
1441 /* This symbol has an entry in the procedure linkage table. Set
1442 it up. */
1443 BFD_ASSERT (h->dynindx != -1);
1444
1445 splt = htab->root.splt;
1446 sgot = htab->root.sgotplt;
1447 srela = htab->root.srelplt;
1448 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1449
1450 /* Get the index in the procedure linkage table which
1451 corresponds to this symbol. This is the index of this symbol
1452 in all the symbols for which we are making plt entries. The
1453 first entry in the procedure linkage table is reserved. */
1454 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1455
1456 /* Get the offset into the .got table of the entry that
1457 corresponds to this function. Each .got entry is 4 bytes.
1458 The first three are reserved. */
1459 got_offset = (plt_index + 3) * 4;
1460
1461 /* Fill in the entry in the procedure linkage table. */
1462 if (! bfd_link_pic (info))
1463 {
1464 /* TODO */
1465 }
1466 else
1467 {
1468 /* TODO */
1469 }
1470
1471 /* Fill in the entry in the global offset table. */
1472 bfd_put_32 (output_bfd,
1473 (splt->output_section->vma
1474 + splt->output_offset
1475 + h->plt.offset
1476 + 12), /* same offset */
1477 sgot->contents + got_offset);
1478
1479 /* Fill in the entry in the .rela.plt section. */
1480 rela.r_offset = (sgot->output_section->vma
1481 + sgot->output_offset
1482 + got_offset);
1483 rela.r_info = ELF32_R_INFO (h->dynindx, R_LM32_JMP_SLOT);
1484 rela.r_addend = 0;
1485 loc = srela->contents;
1486 loc += plt_index * sizeof (Elf32_External_Rela);
1487 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1488
1489 if (!h->def_regular)
1490 {
1491 /* Mark the symbol as undefined, rather than as defined in
1492 the .plt section. Leave the value alone. */
1493 sym->st_shndx = SHN_UNDEF;
1494 }
1495
1496 }
1497
1498 if (h->got.offset != (bfd_vma) -1)
1499 {
1500 asection *sgot;
1501 asection *srela;
1502 Elf_Internal_Rela rela;
1503
1504 /* This symbol has an entry in the global offset table. Set it
1505 up. */
1506 sgot = htab->root.sgot;
1507 srela = htab->root.srelgot;
1508 BFD_ASSERT (sgot != NULL && srela != NULL);
1509
1510 rela.r_offset = (sgot->output_section->vma
1511 + sgot->output_offset
1512 + (h->got.offset &~ 1));
1513
1514 /* If this is a -Bsymbolic link, and the symbol is defined
1515 locally, we just want to emit a RELATIVE reloc. Likewise if
1516 the symbol was forced to be local because of a version file.
1517 The entry in the global offset table will already have been
1518 initialized in the relocate_section function. */
1519 if (bfd_link_pic (info)
1520 && (info->symbolic
1521 || h->dynindx == -1
1522 || h->forced_local)
1523 && h->def_regular)
1524 {
1525 rela.r_info = ELF32_R_INFO (0, R_LM32_RELATIVE);
1526 rela.r_addend = (h->root.u.def.value
1527 + h->root.u.def.section->output_section->vma
1528 + h->root.u.def.section->output_offset);
1529 }
1530 else
1531 {
1532 BFD_ASSERT ((h->got.offset & 1) == 0);
1533 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset);
1534 rela.r_info = ELF32_R_INFO (h->dynindx, R_LM32_GLOB_DAT);
1535 rela.r_addend = 0;
1536 }
1537
1538 loc = srela->contents;
1539 loc += srela->reloc_count * sizeof (Elf32_External_Rela);
1540 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1541 ++srela->reloc_count;
1542 }
1543
1544 if (h->needs_copy)
1545 {
1546 asection *s;
1547 Elf_Internal_Rela rela;
1548
1549 /* This symbols needs a copy reloc. Set it up. */
1550 BFD_ASSERT (h->dynindx != -1
1551 && (h->root.type == bfd_link_hash_defined
1552 || h->root.type == bfd_link_hash_defweak));
1553
1554 s = bfd_get_linker_section (htab->root.dynobj, ".rela.bss");
1555 BFD_ASSERT (s != NULL);
1556
1557 rela.r_offset = (h->root.u.def.value
1558 + h->root.u.def.section->output_section->vma
1559 + h->root.u.def.section->output_offset);
1560 rela.r_info = ELF32_R_INFO (h->dynindx, R_LM32_COPY);
1561 rela.r_addend = 0;
1562 loc = s->contents;
1563 loc += s->reloc_count * sizeof (Elf32_External_Rela);
1564 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1565 ++s->reloc_count;
1566 }
1567
1568 /* Mark some specially defined symbols as absolute. */
1569 if (h == htab->root.hdynamic || h == htab->root.hgot)
1570 sym->st_shndx = SHN_ABS;
1571
1572 return true;
1573 }
1574
1575 static enum elf_reloc_type_class
lm32_elf_reloc_type_class(const struct bfd_link_info * info ATTRIBUTE_UNUSED,const asection * rel_sec ATTRIBUTE_UNUSED,const Elf_Internal_Rela * rela)1576 lm32_elf_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
1577 const asection *rel_sec ATTRIBUTE_UNUSED,
1578 const Elf_Internal_Rela *rela)
1579 {
1580 switch ((int) ELF32_R_TYPE (rela->r_info))
1581 {
1582 case R_LM32_RELATIVE: return reloc_class_relative;
1583 case R_LM32_JMP_SLOT: return reloc_class_plt;
1584 case R_LM32_COPY: return reloc_class_copy;
1585 default: return reloc_class_normal;
1586 }
1587 }
1588
1589 /* Adjust a symbol defined by a dynamic object and referenced by a
1590 regular object. The current definition is in some section of the
1591 dynamic object, but we're not including those sections. We have to
1592 change the definition to something the rest of the link can
1593 understand. */
1594
1595 static bool
lm32_elf_adjust_dynamic_symbol(struct bfd_link_info * info,struct elf_link_hash_entry * h)1596 lm32_elf_adjust_dynamic_symbol (struct bfd_link_info *info,
1597 struct elf_link_hash_entry *h)
1598 {
1599 struct elf_lm32_link_hash_table *htab;
1600 bfd *dynobj;
1601 asection *s;
1602
1603 dynobj = elf_hash_table (info)->dynobj;
1604
1605 /* Make sure we know what is going on here. */
1606 BFD_ASSERT (dynobj != NULL
1607 && (h->needs_plt
1608 || h->is_weakalias
1609 || (h->def_dynamic
1610 && h->ref_regular
1611 && !h->def_regular)));
1612
1613 /* If this is a function, put it in the procedure linkage table. We
1614 will fill in the contents of the procedure linkage table later,
1615 when we know the address of the .got section. */
1616 if (h->type == STT_FUNC
1617 || h->needs_plt)
1618 {
1619 if (! bfd_link_pic (info)
1620 && !h->def_dynamic
1621 && !h->ref_dynamic
1622 && h->root.type != bfd_link_hash_undefweak
1623 && h->root.type != bfd_link_hash_undefined)
1624 {
1625 /* This case can occur if we saw a PLT reloc in an input
1626 file, but the symbol was never referred to by a dynamic
1627 object. In such a case, we don't actually need to build
1628 a procedure linkage table, and we can just do a PCREL
1629 reloc instead. */
1630 h->plt.offset = (bfd_vma) -1;
1631 h->needs_plt = 0;
1632 }
1633
1634 return true;
1635 }
1636 else
1637 h->plt.offset = (bfd_vma) -1;
1638
1639 /* If this is a weak symbol, and there is a real definition, the
1640 processor independent code will have arranged for us to see the
1641 real definition first, and we can just use the same value. */
1642 if (h->is_weakalias)
1643 {
1644 struct elf_link_hash_entry *def = weakdef (h);
1645 BFD_ASSERT (def->root.type == bfd_link_hash_defined);
1646 h->root.u.def.section = def->root.u.def.section;
1647 h->root.u.def.value = def->root.u.def.value;
1648 return true;
1649 }
1650
1651 /* This is a reference to a symbol defined by a dynamic object which
1652 is not a function. */
1653
1654 /* If we are creating a shared library, we must presume that the
1655 only references to the symbol are via the global offset table.
1656 For such cases we need not do anything here; the relocations will
1657 be handled correctly by relocate_section. */
1658 if (bfd_link_pic (info))
1659 return true;
1660
1661 /* If there are no references to this symbol that do not use the
1662 GOT, we don't need to generate a copy reloc. */
1663 if (!h->non_got_ref)
1664 return true;
1665
1666 /* If -z nocopyreloc was given, we won't generate them either. */
1667 if (0 && info->nocopyreloc)
1668 {
1669 h->non_got_ref = 0;
1670 return true;
1671 }
1672
1673 /* If we don't find any dynamic relocs in read-only sections, then
1674 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1675 if (0 && !_bfd_elf_readonly_dynrelocs (h))
1676 {
1677 h->non_got_ref = 0;
1678 return true;
1679 }
1680
1681 /* We must allocate the symbol in our .dynbss section, which will
1682 become part of the .bss section of the executable. There will be
1683 an entry for this symbol in the .dynsym section. The dynamic
1684 object will contain position independent code, so all references
1685 from the dynamic object to this symbol will go through the global
1686 offset table. The dynamic linker will use the .dynsym entry to
1687 determine the address it must put in the global offset table, so
1688 both the dynamic object and the regular object will refer to the
1689 same memory location for the variable. */
1690
1691 htab = lm32_elf_hash_table (info);
1692 if (htab == NULL)
1693 return false;
1694
1695 s = htab->sdynbss;
1696 BFD_ASSERT (s != NULL);
1697
1698 /* We must generate a R_LM32_COPY reloc to tell the dynamic linker
1699 to copy the initial value out of the dynamic object and into the
1700 runtime process image. We need to remember the offset into the
1701 .rela.bss section we are going to use. */
1702 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
1703 {
1704 asection *srel;
1705
1706 srel = htab->srelbss;
1707 BFD_ASSERT (srel != NULL);
1708 srel->size += sizeof (Elf32_External_Rela);
1709 h->needs_copy = 1;
1710 }
1711
1712 return _bfd_elf_adjust_dynamic_copy (info, h, s);
1713 }
1714
1715 /* Allocate space in .plt, .got and associated reloc sections for
1716 dynamic relocs. */
1717
1718 static bool
allocate_dynrelocs(struct elf_link_hash_entry * h,void * inf)1719 allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
1720 {
1721 struct bfd_link_info *info;
1722 struct elf_lm32_link_hash_table *htab;
1723 struct elf_dyn_relocs *p;
1724
1725 if (h->root.type == bfd_link_hash_indirect)
1726 return true;
1727
1728 info = (struct bfd_link_info *) inf;
1729 htab = lm32_elf_hash_table (info);
1730 if (htab == NULL)
1731 return false;
1732
1733 if (htab->root.dynamic_sections_created
1734 && h->plt.refcount > 0)
1735 {
1736 /* Make sure this symbol is output as a dynamic symbol.
1737 Undefined weak syms won't yet be marked as dynamic. */
1738 if (h->dynindx == -1
1739 && !h->forced_local)
1740 {
1741 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1742 return false;
1743 }
1744
1745 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, bfd_link_pic (info), h))
1746 {
1747 asection *s = htab->root.splt;
1748
1749 /* If this is the first .plt entry, make room for the special
1750 first entry. */
1751 if (s->size == 0)
1752 s->size += PLT_ENTRY_SIZE;
1753
1754 h->plt.offset = s->size;
1755
1756 /* If this symbol is not defined in a regular file, and we are
1757 not generating a shared library, then set the symbol to this
1758 location in the .plt. This is required to make function
1759 pointers compare as equal between the normal executable and
1760 the shared library. */
1761 if (! bfd_link_pic (info)
1762 && !h->def_regular)
1763 {
1764 h->root.u.def.section = s;
1765 h->root.u.def.value = h->plt.offset;
1766 }
1767
1768 /* Make room for this entry. */
1769 s->size += PLT_ENTRY_SIZE;
1770
1771 /* We also need to make an entry in the .got.plt section, which
1772 will be placed in the .got section by the linker script. */
1773 htab->root.sgotplt->size += 4;
1774
1775 /* We also need to make an entry in the .rel.plt section. */
1776 htab->root.srelplt->size += sizeof (Elf32_External_Rela);
1777 }
1778 else
1779 {
1780 h->plt.offset = (bfd_vma) -1;
1781 h->needs_plt = 0;
1782 }
1783 }
1784 else
1785 {
1786 h->plt.offset = (bfd_vma) -1;
1787 h->needs_plt = 0;
1788 }
1789
1790 if (h->got.refcount > 0)
1791 {
1792 asection *s;
1793 bool dyn;
1794
1795 /* Make sure this symbol is output as a dynamic symbol.
1796 Undefined weak syms won't yet be marked as dynamic. */
1797 if (h->dynindx == -1
1798 && !h->forced_local)
1799 {
1800 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1801 return false;
1802 }
1803
1804 s = htab->root.sgot;
1805
1806 h->got.offset = s->size;
1807 s->size += 4;
1808 dyn = htab->root.dynamic_sections_created;
1809 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, bfd_link_pic (info), h))
1810 htab->root.srelgot->size += sizeof (Elf32_External_Rela);
1811 }
1812 else
1813 h->got.offset = (bfd_vma) -1;
1814
1815 if (h->dyn_relocs == NULL)
1816 return true;
1817
1818 /* In the shared -Bsymbolic case, discard space allocated for
1819 dynamic pc-relative relocs against symbols which turn out to be
1820 defined in regular objects. For the normal shared case, discard
1821 space for pc-relative relocs that have become local due to symbol
1822 visibility changes. */
1823
1824 if (bfd_link_pic (info))
1825 {
1826 if (h->def_regular
1827 && (h->forced_local
1828 || info->symbolic))
1829 {
1830 struct elf_dyn_relocs **pp;
1831
1832 for (pp = &h->dyn_relocs; (p = *pp) != NULL;)
1833 {
1834 p->count -= p->pc_count;
1835 p->pc_count = 0;
1836 if (p->count == 0)
1837 *pp = p->next;
1838 else
1839 pp = &p->next;
1840 }
1841 }
1842
1843 /* Also discard relocs on undefined weak syms with non-default
1844 visibility. */
1845 if (h->dyn_relocs != NULL
1846 && h->root.type == bfd_link_hash_undefweak)
1847 {
1848 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
1849 h->dyn_relocs = NULL;
1850
1851 /* Make sure undefined weak symbols are output as a dynamic
1852 symbol in PIEs. */
1853 else if (h->dynindx == -1
1854 && !h->forced_local)
1855 {
1856 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1857 return false;
1858 }
1859 }
1860 }
1861 else
1862 {
1863 /* For the non-shared case, discard space for relocs against
1864 symbols which turn out to need copy relocs or are not
1865 dynamic. */
1866
1867 if (!h->non_got_ref
1868 && ((h->def_dynamic
1869 && !h->def_regular)
1870 || (htab->root.dynamic_sections_created
1871 && (h->root.type == bfd_link_hash_undefweak
1872 || h->root.type == bfd_link_hash_undefined))))
1873 {
1874 /* Make sure this symbol is output as a dynamic symbol.
1875 Undefined weak syms won't yet be marked as dynamic. */
1876 if (h->dynindx == -1
1877 && !h->forced_local)
1878 {
1879 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1880 return false;
1881 }
1882
1883 /* If that succeeded, we know we'll be keeping all the
1884 relocs. */
1885 if (h->dynindx != -1)
1886 goto keep;
1887 }
1888
1889 h->dyn_relocs = NULL;
1890
1891 keep: ;
1892 }
1893
1894 /* Finally, allocate space. */
1895 for (p = h->dyn_relocs; p != NULL; p = p->next)
1896 {
1897 asection *sreloc = elf_section_data (p->sec)->sreloc;
1898 sreloc->size += p->count * sizeof (Elf32_External_Rela);
1899 }
1900
1901 return true;
1902 }
1903
1904 /* Set the sizes of the dynamic sections. */
1905
1906 static bool
lm32_elf_late_size_sections(bfd * output_bfd,struct bfd_link_info * info)1907 lm32_elf_late_size_sections (bfd *output_bfd,
1908 struct bfd_link_info *info)
1909 {
1910 struct elf_lm32_link_hash_table *htab;
1911 bfd *dynobj;
1912 asection *s;
1913 bool relocs;
1914 bfd *ibfd;
1915
1916 htab = lm32_elf_hash_table (info);
1917 if (htab == NULL)
1918 return false;
1919
1920 dynobj = htab->root.dynobj;
1921 if (dynobj == NULL)
1922 return true;
1923
1924 if (htab->root.dynamic_sections_created)
1925 {
1926 /* Set the contents of the .interp section to the interpreter. */
1927 if (bfd_link_executable (info) && !info->nointerp)
1928 {
1929 s = bfd_get_linker_section (dynobj, ".interp");
1930 BFD_ASSERT (s != NULL);
1931 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1932 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1933 }
1934 }
1935
1936 /* Set up .got offsets for local syms, and space for local dynamic
1937 relocs. */
1938 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
1939 {
1940 bfd_signed_vma *local_got;
1941 bfd_signed_vma *end_local_got;
1942 bfd_size_type locsymcount;
1943 Elf_Internal_Shdr *symtab_hdr;
1944 asection *srel;
1945
1946 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
1947 continue;
1948
1949 for (s = ibfd->sections; s != NULL; s = s->next)
1950 {
1951 struct elf_dyn_relocs *p;
1952
1953 for (p = ((struct elf_dyn_relocs *)
1954 elf_section_data (s)->local_dynrel);
1955 p != NULL;
1956 p = p->next)
1957 {
1958 if (! bfd_is_abs_section (p->sec)
1959 && bfd_is_abs_section (p->sec->output_section))
1960 {
1961 /* Input section has been discarded, either because
1962 it is a copy of a linkonce section or due to
1963 linker script /DISCARD/, so we'll be discarding
1964 the relocs too. */
1965 }
1966 else if (p->count != 0)
1967 {
1968 srel = elf_section_data (p->sec)->sreloc;
1969 srel->size += p->count * sizeof (Elf32_External_Rela);
1970 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
1971 info->flags |= DF_TEXTREL;
1972 }
1973 }
1974 }
1975
1976 local_got = elf_local_got_refcounts (ibfd);
1977 if (!local_got)
1978 continue;
1979
1980 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
1981 locsymcount = symtab_hdr->sh_info;
1982 end_local_got = local_got + locsymcount;
1983 s = htab->root.sgot;
1984 srel = htab->root.srelgot;
1985 for (; local_got < end_local_got; ++local_got)
1986 {
1987 if (*local_got > 0)
1988 {
1989 *local_got = s->size;
1990 s->size += 4;
1991 if (bfd_link_pic (info))
1992 srel->size += sizeof (Elf32_External_Rela);
1993 }
1994 else
1995 *local_got = (bfd_vma) -1;
1996 }
1997 }
1998
1999 /* Allocate global sym .plt and .got entries, and space for global
2000 sym dynamic relocs. */
2001 elf_link_hash_traverse (&htab->root, allocate_dynrelocs, info);
2002
2003 /* We now have determined the sizes of the various dynamic sections.
2004 Allocate memory for them. */
2005 relocs = false;
2006 for (s = dynobj->sections; s != NULL; s = s->next)
2007 {
2008 if ((s->flags & SEC_LINKER_CREATED) == 0)
2009 continue;
2010
2011 if (s == htab->root.splt
2012 || s == htab->root.sgot
2013 || s == htab->root.sgotplt
2014 || s == htab->sdynbss)
2015 {
2016 /* Strip this section if we don't need it; see the
2017 comment below. */
2018 }
2019 else if (startswith (bfd_section_name (s), ".rela"))
2020 {
2021 if (s->size != 0 && s != htab->root.srelplt)
2022 relocs = true;
2023
2024 /* We use the reloc_count field as a counter if we need
2025 to copy relocs into the output file. */
2026 s->reloc_count = 0;
2027 }
2028 else
2029 /* It's not one of our sections, so don't allocate space. */
2030 continue;
2031
2032 if (s->size == 0)
2033 {
2034 /* If we don't need this section, strip it from the
2035 output file. This is mostly to handle .rela.bss and
2036 .rela.plt. We must create both sections in
2037 create_dynamic_sections, because they must be created
2038 before the linker maps input sections to output
2039 sections. The linker does that before
2040 adjust_dynamic_symbol is called, and it is that
2041 function which decides whether anything needs to go
2042 into these sections. */
2043 s->flags |= SEC_EXCLUDE;
2044 continue;
2045 }
2046
2047 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2048 continue;
2049
2050 /* Allocate memory for the section contents. We use bfd_zalloc
2051 here in case unused entries are not reclaimed before the
2052 section's contents are written out. This should not happen,
2053 but this way if it does, we get a R_LM32_NONE reloc instead
2054 of garbage. */
2055 s->contents = bfd_zalloc (dynobj, s->size);
2056 if (s->contents == NULL)
2057 return false;
2058 }
2059
2060 if (!_bfd_elf_add_dynamic_tags (output_bfd, info, relocs))
2061 return false;
2062
2063 /* Allocate .rofixup section. */
2064 if (IS_FDPIC (output_bfd))
2065 {
2066 struct weak_symbol_list *list_start = NULL, *list_end = NULL;
2067 int rgot_weak_count = 0;
2068 int r32_count = 0;
2069 int rgot_count ATTRIBUTE_UNUSED = 0;
2070 /* Look for deleted sections. */
2071 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
2072 {
2073 for (s = ibfd->sections; s != NULL; s = s->next)
2074 {
2075 if (s->reloc_count)
2076 {
2077 /* Count relocs that need .rofixup entires. */
2078 Elf_Internal_Rela *internal_relocs, *end;
2079 internal_relocs = elf_section_data (s)->relocs;
2080 if (internal_relocs == NULL)
2081 internal_relocs = (_bfd_elf_link_read_relocs (ibfd, s, NULL, NULL, false));
2082 if (internal_relocs != NULL)
2083 {
2084 end = internal_relocs + s->reloc_count;
2085 while (internal_relocs < end)
2086 {
2087 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
2088 struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (ibfd);
2089 unsigned long r_symndx;
2090 struct elf_link_hash_entry *h;
2091
2092 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
2093 sym_hashes = elf_sym_hashes (ibfd);
2094 r_symndx = ELF32_R_SYM (internal_relocs->r_info);
2095 h = NULL;
2096 if (r_symndx < symtab_hdr->sh_info)
2097 {
2098 }
2099 else
2100 {
2101 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2102 while (h->root.type == bfd_link_hash_indirect
2103 || h->root.type == bfd_link_hash_warning)
2104 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2105 }
2106
2107 /* Don't generate entries for weak symbols. */
2108 if (!h || (h && h->root.type != bfd_link_hash_undefweak))
2109 {
2110 if (!discarded_section (s) && !((bfd_section_flags (s) & SEC_ALLOC) == 0))
2111 {
2112 switch (ELF32_R_TYPE (internal_relocs->r_info))
2113 {
2114 case R_LM32_32:
2115 r32_count++;
2116 break;
2117 case R_LM32_16_GOT:
2118 rgot_count++;
2119 break;
2120 }
2121 }
2122 }
2123 else
2124 {
2125 struct weak_symbol_list *current, *new_entry;
2126 /* Is this symbol already in the list? */
2127 for (current = list_start; current; current = current->next)
2128 {
2129 if (!strcmp (current->name, h->root.root.string))
2130 break;
2131 }
2132 if (!current && !discarded_section (s) && (bfd_section_flags (s) & SEC_ALLOC))
2133 {
2134 /* Will this have an entry in the GOT. */
2135 if (ELF32_R_TYPE (internal_relocs->r_info) == R_LM32_16_GOT)
2136 {
2137 /* Create a new entry. */
2138 new_entry = malloc (sizeof (struct weak_symbol_list));
2139 if (!new_entry)
2140 return false;
2141 new_entry->name = h->root.root.string;
2142 new_entry->next = NULL;
2143 /* Add to list */
2144 if (list_start == NULL)
2145 {
2146 list_start = new_entry;
2147 list_end = new_entry;
2148 }
2149 else
2150 {
2151 list_end->next = new_entry;
2152 list_end = new_entry;
2153 }
2154 /* Increase count of undefined weak symbols in the got. */
2155 rgot_weak_count++;
2156 }
2157 }
2158 }
2159 internal_relocs++;
2160 }
2161 }
2162 else
2163 return false;
2164 }
2165 }
2166 }
2167 /* Free list. */
2168 while (list_start)
2169 {
2170 list_end = list_start->next;
2171 free (list_start);
2172 list_start = list_end;
2173 }
2174
2175 /* Size sections. */
2176 lm32fdpic_fixup32_section (info)->size
2177 = (r32_count + (htab->root.sgot->size / 4) - rgot_weak_count + 1) * 4;
2178 if (lm32fdpic_fixup32_section (info)->size == 0)
2179 lm32fdpic_fixup32_section (info)->flags |= SEC_EXCLUDE;
2180 else
2181 {
2182 lm32fdpic_fixup32_section (info)->contents =
2183 bfd_zalloc (dynobj, lm32fdpic_fixup32_section (info)->size);
2184 if (lm32fdpic_fixup32_section (info)->contents == NULL)
2185 return false;
2186 }
2187 }
2188
2189 return true;
2190 }
2191
2192 /* Create dynamic sections when linking against a dynamic object. */
2193
2194 static bool
lm32_elf_create_dynamic_sections(bfd * abfd,struct bfd_link_info * info)2195 lm32_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
2196 {
2197 struct elf_lm32_link_hash_table *htab;
2198 flagword flags, pltflags;
2199 asection *s;
2200 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
2201 int ptralign = 2; /* 32bit */
2202
2203 htab = lm32_elf_hash_table (info);
2204 if (htab == NULL)
2205 return false;
2206
2207 /* Make sure we have a GOT - For the case where we have a dynamic object
2208 but none of the relocs in check_relocs */
2209 if (!_bfd_elf_create_got_section (abfd, info))
2210 return false;
2211 if (IS_FDPIC (abfd) && (htab->sfixup32 == NULL))
2212 {
2213 if (! create_rofixup_section (abfd, info))
2214 return false;
2215 }
2216
2217 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
2218 .rel[a].bss sections. */
2219 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
2220 | SEC_LINKER_CREATED);
2221
2222 pltflags = flags;
2223 pltflags |= SEC_CODE;
2224 if (bed->plt_not_loaded)
2225 pltflags &= ~ (SEC_LOAD | SEC_HAS_CONTENTS);
2226 if (bed->plt_readonly)
2227 pltflags |= SEC_READONLY;
2228
2229 s = bfd_make_section_anyway_with_flags (abfd, ".plt", pltflags);
2230 htab->root.splt = s;
2231 if (s == NULL
2232 || !bfd_set_section_alignment (s, bed->plt_alignment))
2233 return false;
2234
2235 if (bed->want_plt_sym)
2236 {
2237 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
2238 .plt section. */
2239 struct bfd_link_hash_entry *bh = NULL;
2240 struct elf_link_hash_entry *h;
2241
2242 if (! (_bfd_generic_link_add_one_symbol
2243 (info, abfd, "_PROCEDURE_LINKAGE_TABLE_", BSF_GLOBAL, s,
2244 (bfd_vma) 0, NULL, false,
2245 get_elf_backend_data (abfd)->collect, &bh)))
2246 return false;
2247 h = (struct elf_link_hash_entry *) bh;
2248 h->def_regular = 1;
2249 h->type = STT_OBJECT;
2250 htab->root.hplt = h;
2251
2252 if (bfd_link_pic (info)
2253 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2254 return false;
2255 }
2256
2257 s = bfd_make_section_anyway_with_flags (abfd,
2258 bed->default_use_rela_p
2259 ? ".rela.plt" : ".rel.plt",
2260 flags | SEC_READONLY);
2261 htab->root.srelplt = s;
2262 if (s == NULL
2263 || !bfd_set_section_alignment (s, ptralign))
2264 return false;
2265
2266 if (htab->root.sgot == NULL
2267 && !_bfd_elf_create_got_section (abfd, info))
2268 return false;
2269
2270 if (bed->want_dynbss)
2271 {
2272 /* The .dynbss section is a place to put symbols which are defined
2273 by dynamic objects, are referenced by regular objects, and are
2274 not functions. We must allocate space for them in the process
2275 image and use a R_*_COPY reloc to tell the dynamic linker to
2276 initialize them at run time. The linker script puts the .dynbss
2277 section into the .bss section of the final image. */
2278 s = bfd_make_section_anyway_with_flags (abfd, ".dynbss",
2279 SEC_ALLOC | SEC_LINKER_CREATED);
2280 htab->sdynbss = s;
2281 if (s == NULL)
2282 return false;
2283 /* The .rel[a].bss section holds copy relocs. This section is not
2284 normally needed. We need to create it here, though, so that the
2285 linker will map it to an output section. We can't just create it
2286 only if we need it, because we will not know whether we need it
2287 until we have seen all the input files, and the first time the
2288 main linker code calls BFD after examining all the input files
2289 (size_dynamic_sections) the input sections have already been
2290 mapped to the output sections. If the section turns out not to
2291 be needed, we can discard it later. We will never need this
2292 section when generating a shared object, since they do not use
2293 copy relocs. */
2294 if (! bfd_link_pic (info))
2295 {
2296 s = bfd_make_section_anyway_with_flags (abfd,
2297 (bed->default_use_rela_p
2298 ? ".rela.bss" : ".rel.bss"),
2299 flags | SEC_READONLY);
2300 htab->srelbss = s;
2301 if (s == NULL
2302 || !bfd_set_section_alignment (s, ptralign))
2303 return false;
2304 }
2305 }
2306
2307 return true;
2308 }
2309
2310 static bool
lm32_elf_early_size_sections(bfd * output_bfd,struct bfd_link_info * info)2311 lm32_elf_early_size_sections (bfd *output_bfd, struct bfd_link_info *info)
2312 {
2313 if (!bfd_link_relocatable (info))
2314 {
2315 if (!bfd_elf_stack_segment_size (output_bfd, info,
2316 "__stacksize", DEFAULT_STACK_SIZE))
2317 return false;
2318
2319 asection *sec = bfd_get_section_by_name (output_bfd, ".stack");
2320 if (sec)
2321 sec->size = info->stacksize >= 0 ? info->stacksize : 0;
2322 }
2323
2324 return true;
2325 }
2326
2327 static bool
lm32_elf_fdpic_copy_private_bfd_data(bfd * ibfd,bfd * obfd)2328 lm32_elf_fdpic_copy_private_bfd_data (bfd *ibfd, bfd *obfd)
2329 {
2330 unsigned i;
2331
2332 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
2333 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
2334 return true;
2335
2336 if (! _bfd_elf_copy_private_bfd_data (ibfd, obfd))
2337 return false;
2338
2339 if (! elf_tdata (ibfd) || ! elf_tdata (ibfd)->phdr
2340 || ! elf_tdata (obfd) || ! elf_tdata (obfd)->phdr)
2341 return true;
2342
2343 /* Copy the stack size. */
2344 for (i = 0; i < elf_elfheader (ibfd)->e_phnum; i++)
2345 if (elf_tdata (ibfd)->phdr[i].p_type == PT_GNU_STACK)
2346 {
2347 Elf_Internal_Phdr *iphdr = &elf_tdata (ibfd)->phdr[i];
2348
2349 for (i = 0; i < elf_elfheader (obfd)->e_phnum; i++)
2350 if (elf_tdata (obfd)->phdr[i].p_type == PT_GNU_STACK)
2351 {
2352 memcpy (&elf_tdata (obfd)->phdr[i], iphdr, sizeof (*iphdr));
2353
2354 /* Rewrite the phdrs, since we're only called after they were first written. */
2355 if (bfd_seek (obfd, (bfd_signed_vma) get_elf_backend_data (obfd)
2356 ->s->sizeof_ehdr, SEEK_SET) != 0
2357 || get_elf_backend_data (obfd)->s->write_out_phdrs (obfd, elf_tdata (obfd)->phdr,
2358 elf_elfheader (obfd)->e_phnum) != 0)
2359 return false;
2360 break;
2361 }
2362
2363 break;
2364 }
2365
2366 return true;
2367 }
2368
2369
2370 #define ELF_ARCH bfd_arch_lm32
2371 #define ELF_TARGET_ID LM32_ELF_DATA
2372 #define ELF_MACHINE_CODE EM_LATTICEMICO32
2373 #define ELF_MAXPAGESIZE 0x1000
2374
2375 #define TARGET_BIG_SYM lm32_elf32_vec
2376 #define TARGET_BIG_NAME "elf32-lm32"
2377
2378 #define bfd_elf32_bfd_reloc_type_lookup lm32_reloc_type_lookup
2379 #define bfd_elf32_bfd_reloc_name_lookup lm32_reloc_name_lookup
2380 #define elf_info_to_howto lm32_info_to_howto_rela
2381 #define elf_info_to_howto_rel NULL
2382 #define elf_backend_rela_normal 1
2383 #define elf_backend_object_p lm32_elf_object_p
2384 #define elf_backend_final_write_processing lm32_elf_final_write_processing
2385 #define elf_backend_stack_align 8
2386 #define elf_backend_can_gc_sections 1
2387 #define elf_backend_can_refcount 1
2388 #define elf_backend_gc_mark_hook lm32_elf_gc_mark_hook
2389 #define elf_backend_plt_readonly 1
2390 #define elf_backend_want_got_plt 1
2391 #define elf_backend_want_plt_sym 0
2392 #define elf_backend_got_header_size 12
2393 #define elf_backend_dtrel_excludes_plt 1
2394 #define bfd_elf32_bfd_link_hash_table_create lm32_elf_link_hash_table_create
2395 #define elf_backend_check_relocs lm32_elf_check_relocs
2396 #define elf_backend_reloc_type_class lm32_elf_reloc_type_class
2397 #define elf_backend_late_size_sections lm32_elf_late_size_sections
2398 #define elf_backend_omit_section_dynsym _bfd_elf_omit_section_dynsym_all
2399 #define elf_backend_create_dynamic_sections lm32_elf_create_dynamic_sections
2400 #define elf_backend_finish_dynamic_sections lm32_elf_finish_dynamic_sections
2401 #define elf_backend_adjust_dynamic_symbol lm32_elf_adjust_dynamic_symbol
2402 #define elf_backend_finish_dynamic_symbol lm32_elf_finish_dynamic_symbol
2403 #define elf_backend_relocate_section lm32_elf_relocate_section
2404
2405 #include "elf32-target.h"
2406
2407 #undef ELF_MAXPAGESIZE
2408 #define ELF_MAXPAGESIZE 0x4000
2409
2410
2411 #undef TARGET_BIG_SYM
2412 #define TARGET_BIG_SYM lm32_elf32_fdpic_vec
2413 #undef TARGET_BIG_NAME
2414 #define TARGET_BIG_NAME "elf32-lm32fdpic"
2415 #undef elf32_bed
2416 #define elf32_bed elf32_lm32fdpic_bed
2417
2418 #undef elf_backend_early_size_sections
2419 #define elf_backend_early_size_sections lm32_elf_early_size_sections
2420 #undef bfd_elf32_bfd_copy_private_bfd_data
2421 #define bfd_elf32_bfd_copy_private_bfd_data lm32_elf_fdpic_copy_private_bfd_data
2422
2423 #include "elf32-target.h"
2424