1 /* Lattice Mico32-specific support for 32-bit ELF
2 Copyright (C) 2008-2022 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 if (htab == NULL)
1431 return false;
1432
1433 if (h->plt.offset != (bfd_vma) -1)
1434 {
1435 asection *splt;
1436 asection *sgot;
1437 asection *srela;
1438
1439 bfd_vma plt_index;
1440 bfd_vma got_offset;
1441 Elf_Internal_Rela rela;
1442
1443 /* This symbol has an entry in the procedure linkage table. Set
1444 it up. */
1445 BFD_ASSERT (h->dynindx != -1);
1446
1447 splt = htab->root.splt;
1448 sgot = htab->root.sgotplt;
1449 srela = htab->root.srelplt;
1450 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1451
1452 /* Get the index in the procedure linkage table which
1453 corresponds to this symbol. This is the index of this symbol
1454 in all the symbols for which we are making plt entries. The
1455 first entry in the procedure linkage table is reserved. */
1456 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1457
1458 /* Get the offset into the .got table of the entry that
1459 corresponds to this function. Each .got entry is 4 bytes.
1460 The first three are reserved. */
1461 got_offset = (plt_index + 3) * 4;
1462
1463 /* Fill in the entry in the procedure linkage table. */
1464 if (! bfd_link_pic (info))
1465 {
1466 /* TODO */
1467 }
1468 else
1469 {
1470 /* TODO */
1471 }
1472
1473 /* Fill in the entry in the global offset table. */
1474 bfd_put_32 (output_bfd,
1475 (splt->output_section->vma
1476 + splt->output_offset
1477 + h->plt.offset
1478 + 12), /* same offset */
1479 sgot->contents + got_offset);
1480
1481 /* Fill in the entry in the .rela.plt section. */
1482 rela.r_offset = (sgot->output_section->vma
1483 + sgot->output_offset
1484 + got_offset);
1485 rela.r_info = ELF32_R_INFO (h->dynindx, R_LM32_JMP_SLOT);
1486 rela.r_addend = 0;
1487 loc = srela->contents;
1488 loc += plt_index * sizeof (Elf32_External_Rela);
1489 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1490
1491 if (!h->def_regular)
1492 {
1493 /* Mark the symbol as undefined, rather than as defined in
1494 the .plt section. Leave the value alone. */
1495 sym->st_shndx = SHN_UNDEF;
1496 }
1497
1498 }
1499
1500 if (h->got.offset != (bfd_vma) -1)
1501 {
1502 asection *sgot;
1503 asection *srela;
1504 Elf_Internal_Rela rela;
1505
1506 /* This symbol has an entry in the global offset table. Set it
1507 up. */
1508 sgot = htab->root.sgot;
1509 srela = htab->root.srelgot;
1510 BFD_ASSERT (sgot != NULL && srela != NULL);
1511
1512 rela.r_offset = (sgot->output_section->vma
1513 + sgot->output_offset
1514 + (h->got.offset &~ 1));
1515
1516 /* If this is a -Bsymbolic link, and the symbol is defined
1517 locally, we just want to emit a RELATIVE reloc. Likewise if
1518 the symbol was forced to be local because of a version file.
1519 The entry in the global offset table will already have been
1520 initialized in the relocate_section function. */
1521 if (bfd_link_pic (info)
1522 && (info->symbolic
1523 || h->dynindx == -1
1524 || h->forced_local)
1525 && h->def_regular)
1526 {
1527 rela.r_info = ELF32_R_INFO (0, R_LM32_RELATIVE);
1528 rela.r_addend = (h->root.u.def.value
1529 + h->root.u.def.section->output_section->vma
1530 + h->root.u.def.section->output_offset);
1531 }
1532 else
1533 {
1534 BFD_ASSERT ((h->got.offset & 1) == 0);
1535 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset);
1536 rela.r_info = ELF32_R_INFO (h->dynindx, R_LM32_GLOB_DAT);
1537 rela.r_addend = 0;
1538 }
1539
1540 loc = srela->contents;
1541 loc += srela->reloc_count * sizeof (Elf32_External_Rela);
1542 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1543 ++srela->reloc_count;
1544 }
1545
1546 if (h->needs_copy)
1547 {
1548 asection *s;
1549 Elf_Internal_Rela rela;
1550
1551 /* This symbols needs a copy reloc. Set it up. */
1552 BFD_ASSERT (h->dynindx != -1
1553 && (h->root.type == bfd_link_hash_defined
1554 || h->root.type == bfd_link_hash_defweak));
1555
1556 s = bfd_get_linker_section (htab->root.dynobj, ".rela.bss");
1557 BFD_ASSERT (s != NULL);
1558
1559 rela.r_offset = (h->root.u.def.value
1560 + h->root.u.def.section->output_section->vma
1561 + h->root.u.def.section->output_offset);
1562 rela.r_info = ELF32_R_INFO (h->dynindx, R_LM32_COPY);
1563 rela.r_addend = 0;
1564 loc = s->contents;
1565 loc += s->reloc_count * sizeof (Elf32_External_Rela);
1566 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1567 ++s->reloc_count;
1568 }
1569
1570 /* Mark some specially defined symbols as absolute. */
1571 if (h == htab->root.hdynamic || h == htab->root.hgot)
1572 sym->st_shndx = SHN_ABS;
1573
1574 return true;
1575 }
1576
1577 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)1578 lm32_elf_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
1579 const asection *rel_sec ATTRIBUTE_UNUSED,
1580 const Elf_Internal_Rela *rela)
1581 {
1582 switch ((int) ELF32_R_TYPE (rela->r_info))
1583 {
1584 case R_LM32_RELATIVE: return reloc_class_relative;
1585 case R_LM32_JMP_SLOT: return reloc_class_plt;
1586 case R_LM32_COPY: return reloc_class_copy;
1587 default: return reloc_class_normal;
1588 }
1589 }
1590
1591 /* Adjust a symbol defined by a dynamic object and referenced by a
1592 regular object. The current definition is in some section of the
1593 dynamic object, but we're not including those sections. We have to
1594 change the definition to something the rest of the link can
1595 understand. */
1596
1597 static bool
lm32_elf_adjust_dynamic_symbol(struct bfd_link_info * info,struct elf_link_hash_entry * h)1598 lm32_elf_adjust_dynamic_symbol (struct bfd_link_info *info,
1599 struct elf_link_hash_entry *h)
1600 {
1601 struct elf_lm32_link_hash_table *htab;
1602 bfd *dynobj;
1603 asection *s;
1604
1605 dynobj = elf_hash_table (info)->dynobj;
1606
1607 /* Make sure we know what is going on here. */
1608 BFD_ASSERT (dynobj != NULL
1609 && (h->needs_plt
1610 || h->is_weakalias
1611 || (h->def_dynamic
1612 && h->ref_regular
1613 && !h->def_regular)));
1614
1615 /* If this is a function, put it in the procedure linkage table. We
1616 will fill in the contents of the procedure linkage table later,
1617 when we know the address of the .got section. */
1618 if (h->type == STT_FUNC
1619 || h->needs_plt)
1620 {
1621 if (! bfd_link_pic (info)
1622 && !h->def_dynamic
1623 && !h->ref_dynamic
1624 && h->root.type != bfd_link_hash_undefweak
1625 && h->root.type != bfd_link_hash_undefined)
1626 {
1627 /* This case can occur if we saw a PLT reloc in an input
1628 file, but the symbol was never referred to by a dynamic
1629 object. In such a case, we don't actually need to build
1630 a procedure linkage table, and we can just do a PCREL
1631 reloc instead. */
1632 h->plt.offset = (bfd_vma) -1;
1633 h->needs_plt = 0;
1634 }
1635
1636 return true;
1637 }
1638 else
1639 h->plt.offset = (bfd_vma) -1;
1640
1641 /* If this is a weak symbol, and there is a real definition, the
1642 processor independent code will have arranged for us to see the
1643 real definition first, and we can just use the same value. */
1644 if (h->is_weakalias)
1645 {
1646 struct elf_link_hash_entry *def = weakdef (h);
1647 BFD_ASSERT (def->root.type == bfd_link_hash_defined);
1648 h->root.u.def.section = def->root.u.def.section;
1649 h->root.u.def.value = def->root.u.def.value;
1650 return true;
1651 }
1652
1653 /* This is a reference to a symbol defined by a dynamic object which
1654 is not a function. */
1655
1656 /* If we are creating a shared library, we must presume that the
1657 only references to the symbol are via the global offset table.
1658 For such cases we need not do anything here; the relocations will
1659 be handled correctly by relocate_section. */
1660 if (bfd_link_pic (info))
1661 return true;
1662
1663 /* If there are no references to this symbol that do not use the
1664 GOT, we don't need to generate a copy reloc. */
1665 if (!h->non_got_ref)
1666 return true;
1667
1668 /* If -z nocopyreloc was given, we won't generate them either. */
1669 if (0 && info->nocopyreloc)
1670 {
1671 h->non_got_ref = 0;
1672 return true;
1673 }
1674
1675 /* If we don't find any dynamic relocs in read-only sections, then
1676 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1677 if (0 && !_bfd_elf_readonly_dynrelocs (h))
1678 {
1679 h->non_got_ref = 0;
1680 return true;
1681 }
1682
1683 /* We must allocate the symbol in our .dynbss section, which will
1684 become part of the .bss section of the executable. There will be
1685 an entry for this symbol in the .dynsym section. The dynamic
1686 object will contain position independent code, so all references
1687 from the dynamic object to this symbol will go through the global
1688 offset table. The dynamic linker will use the .dynsym entry to
1689 determine the address it must put in the global offset table, so
1690 both the dynamic object and the regular object will refer to the
1691 same memory location for the variable. */
1692
1693 htab = lm32_elf_hash_table (info);
1694 if (htab == NULL)
1695 return false;
1696
1697 s = htab->sdynbss;
1698 BFD_ASSERT (s != NULL);
1699
1700 /* We must generate a R_LM32_COPY reloc to tell the dynamic linker
1701 to copy the initial value out of the dynamic object and into the
1702 runtime process image. We need to remember the offset into the
1703 .rela.bss section we are going to use. */
1704 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
1705 {
1706 asection *srel;
1707
1708 srel = htab->srelbss;
1709 BFD_ASSERT (srel != NULL);
1710 srel->size += sizeof (Elf32_External_Rela);
1711 h->needs_copy = 1;
1712 }
1713
1714 return _bfd_elf_adjust_dynamic_copy (info, h, s);
1715 }
1716
1717 /* Allocate space in .plt, .got and associated reloc sections for
1718 dynamic relocs. */
1719
1720 static bool
allocate_dynrelocs(struct elf_link_hash_entry * h,void * inf)1721 allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
1722 {
1723 struct bfd_link_info *info;
1724 struct elf_lm32_link_hash_table *htab;
1725 struct elf_dyn_relocs *p;
1726
1727 if (h->root.type == bfd_link_hash_indirect)
1728 return true;
1729
1730 info = (struct bfd_link_info *) inf;
1731 htab = lm32_elf_hash_table (info);
1732 if (htab == NULL)
1733 return false;
1734
1735 if (htab->root.dynamic_sections_created
1736 && h->plt.refcount > 0)
1737 {
1738 /* Make sure this symbol is output as a dynamic symbol.
1739 Undefined weak syms won't yet be marked as dynamic. */
1740 if (h->dynindx == -1
1741 && !h->forced_local)
1742 {
1743 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1744 return false;
1745 }
1746
1747 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, bfd_link_pic (info), h))
1748 {
1749 asection *s = htab->root.splt;
1750
1751 /* If this is the first .plt entry, make room for the special
1752 first entry. */
1753 if (s->size == 0)
1754 s->size += PLT_ENTRY_SIZE;
1755
1756 h->plt.offset = s->size;
1757
1758 /* If this symbol is not defined in a regular file, and we are
1759 not generating a shared library, then set the symbol to this
1760 location in the .plt. This is required to make function
1761 pointers compare as equal between the normal executable and
1762 the shared library. */
1763 if (! bfd_link_pic (info)
1764 && !h->def_regular)
1765 {
1766 h->root.u.def.section = s;
1767 h->root.u.def.value = h->plt.offset;
1768 }
1769
1770 /* Make room for this entry. */
1771 s->size += PLT_ENTRY_SIZE;
1772
1773 /* We also need to make an entry in the .got.plt section, which
1774 will be placed in the .got section by the linker script. */
1775 htab->root.sgotplt->size += 4;
1776
1777 /* We also need to make an entry in the .rel.plt section. */
1778 htab->root.srelplt->size += sizeof (Elf32_External_Rela);
1779 }
1780 else
1781 {
1782 h->plt.offset = (bfd_vma) -1;
1783 h->needs_plt = 0;
1784 }
1785 }
1786 else
1787 {
1788 h->plt.offset = (bfd_vma) -1;
1789 h->needs_plt = 0;
1790 }
1791
1792 if (h->got.refcount > 0)
1793 {
1794 asection *s;
1795 bool dyn;
1796
1797 /* Make sure this symbol is output as a dynamic symbol.
1798 Undefined weak syms won't yet be marked as dynamic. */
1799 if (h->dynindx == -1
1800 && !h->forced_local)
1801 {
1802 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1803 return false;
1804 }
1805
1806 s = htab->root.sgot;
1807
1808 h->got.offset = s->size;
1809 s->size += 4;
1810 dyn = htab->root.dynamic_sections_created;
1811 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, bfd_link_pic (info), h))
1812 htab->root.srelgot->size += sizeof (Elf32_External_Rela);
1813 }
1814 else
1815 h->got.offset = (bfd_vma) -1;
1816
1817 if (h->dyn_relocs == NULL)
1818 return true;
1819
1820 /* In the shared -Bsymbolic case, discard space allocated for
1821 dynamic pc-relative relocs against symbols which turn out to be
1822 defined in regular objects. For the normal shared case, discard
1823 space for pc-relative relocs that have become local due to symbol
1824 visibility changes. */
1825
1826 if (bfd_link_pic (info))
1827 {
1828 if (h->def_regular
1829 && (h->forced_local
1830 || info->symbolic))
1831 {
1832 struct elf_dyn_relocs **pp;
1833
1834 for (pp = &h->dyn_relocs; (p = *pp) != NULL;)
1835 {
1836 p->count -= p->pc_count;
1837 p->pc_count = 0;
1838 if (p->count == 0)
1839 *pp = p->next;
1840 else
1841 pp = &p->next;
1842 }
1843 }
1844
1845 /* Also discard relocs on undefined weak syms with non-default
1846 visibility. */
1847 if (h->dyn_relocs != NULL
1848 && h->root.type == bfd_link_hash_undefweak)
1849 {
1850 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
1851 h->dyn_relocs = NULL;
1852
1853 /* Make sure undefined weak symbols are output as a dynamic
1854 symbol in PIEs. */
1855 else if (h->dynindx == -1
1856 && !h->forced_local)
1857 {
1858 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1859 return false;
1860 }
1861 }
1862 }
1863 else
1864 {
1865 /* For the non-shared case, discard space for relocs against
1866 symbols which turn out to need copy relocs or are not
1867 dynamic. */
1868
1869 if (!h->non_got_ref
1870 && ((h->def_dynamic
1871 && !h->def_regular)
1872 || (htab->root.dynamic_sections_created
1873 && (h->root.type == bfd_link_hash_undefweak
1874 || h->root.type == bfd_link_hash_undefined))))
1875 {
1876 /* Make sure this symbol is output as a dynamic symbol.
1877 Undefined weak syms won't yet be marked as dynamic. */
1878 if (h->dynindx == -1
1879 && !h->forced_local)
1880 {
1881 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1882 return false;
1883 }
1884
1885 /* If that succeeded, we know we'll be keeping all the
1886 relocs. */
1887 if (h->dynindx != -1)
1888 goto keep;
1889 }
1890
1891 h->dyn_relocs = NULL;
1892
1893 keep: ;
1894 }
1895
1896 /* Finally, allocate space. */
1897 for (p = h->dyn_relocs; p != NULL; p = p->next)
1898 {
1899 asection *sreloc = elf_section_data (p->sec)->sreloc;
1900 sreloc->size += p->count * sizeof (Elf32_External_Rela);
1901 }
1902
1903 return true;
1904 }
1905
1906 /* Set the sizes of the dynamic sections. */
1907
1908 static bool
lm32_elf_size_dynamic_sections(bfd * output_bfd,struct bfd_link_info * info)1909 lm32_elf_size_dynamic_sections (bfd *output_bfd,
1910 struct bfd_link_info *info)
1911 {
1912 struct elf_lm32_link_hash_table *htab;
1913 bfd *dynobj;
1914 asection *s;
1915 bool relocs;
1916 bfd *ibfd;
1917
1918 htab = lm32_elf_hash_table (info);
1919 if (htab == NULL)
1920 return false;
1921
1922 dynobj = htab->root.dynobj;
1923 BFD_ASSERT (dynobj != NULL);
1924
1925 if (htab->root.dynamic_sections_created)
1926 {
1927 /* Set the contents of the .interp section to the interpreter. */
1928 if (bfd_link_executable (info) && !info->nointerp)
1929 {
1930 s = bfd_get_linker_section (dynobj, ".interp");
1931 BFD_ASSERT (s != NULL);
1932 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1933 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1934 }
1935 }
1936
1937 /* Set up .got offsets for local syms, and space for local dynamic
1938 relocs. */
1939 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
1940 {
1941 bfd_signed_vma *local_got;
1942 bfd_signed_vma *end_local_got;
1943 bfd_size_type locsymcount;
1944 Elf_Internal_Shdr *symtab_hdr;
1945 asection *srel;
1946
1947 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
1948 continue;
1949
1950 for (s = ibfd->sections; s != NULL; s = s->next)
1951 {
1952 struct elf_dyn_relocs *p;
1953
1954 for (p = ((struct elf_dyn_relocs *)
1955 elf_section_data (s)->local_dynrel);
1956 p != NULL;
1957 p = p->next)
1958 {
1959 if (! bfd_is_abs_section (p->sec)
1960 && bfd_is_abs_section (p->sec->output_section))
1961 {
1962 /* Input section has been discarded, either because
1963 it is a copy of a linkonce section or due to
1964 linker script /DISCARD/, so we'll be discarding
1965 the relocs too. */
1966 }
1967 else if (p->count != 0)
1968 {
1969 srel = elf_section_data (p->sec)->sreloc;
1970 srel->size += p->count * sizeof (Elf32_External_Rela);
1971 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
1972 info->flags |= DF_TEXTREL;
1973 }
1974 }
1975 }
1976
1977 local_got = elf_local_got_refcounts (ibfd);
1978 if (!local_got)
1979 continue;
1980
1981 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
1982 locsymcount = symtab_hdr->sh_info;
1983 end_local_got = local_got + locsymcount;
1984 s = htab->root.sgot;
1985 srel = htab->root.srelgot;
1986 for (; local_got < end_local_got; ++local_got)
1987 {
1988 if (*local_got > 0)
1989 {
1990 *local_got = s->size;
1991 s->size += 4;
1992 if (bfd_link_pic (info))
1993 srel->size += sizeof (Elf32_External_Rela);
1994 }
1995 else
1996 *local_got = (bfd_vma) -1;
1997 }
1998 }
1999
2000 /* Allocate global sym .plt and .got entries, and space for global
2001 sym dynamic relocs. */
2002 elf_link_hash_traverse (&htab->root, allocate_dynrelocs, info);
2003
2004 /* We now have determined the sizes of the various dynamic sections.
2005 Allocate memory for them. */
2006 relocs = false;
2007 for (s = dynobj->sections; s != NULL; s = s->next)
2008 {
2009 if ((s->flags & SEC_LINKER_CREATED) == 0)
2010 continue;
2011
2012 if (s == htab->root.splt
2013 || s == htab->root.sgot
2014 || s == htab->root.sgotplt
2015 || s == htab->sdynbss)
2016 {
2017 /* Strip this section if we don't need it; see the
2018 comment below. */
2019 }
2020 else if (startswith (bfd_section_name (s), ".rela"))
2021 {
2022 if (s->size != 0 && s != htab->root.srelplt)
2023 relocs = true;
2024
2025 /* We use the reloc_count field as a counter if we need
2026 to copy relocs into the output file. */
2027 s->reloc_count = 0;
2028 }
2029 else
2030 /* It's not one of our sections, so don't allocate space. */
2031 continue;
2032
2033 if (s->size == 0)
2034 {
2035 /* If we don't need this section, strip it from the
2036 output file. This is mostly to handle .rela.bss and
2037 .rela.plt. We must create both sections in
2038 create_dynamic_sections, because they must be created
2039 before the linker maps input sections to output
2040 sections. The linker does that before
2041 adjust_dynamic_symbol is called, and it is that
2042 function which decides whether anything needs to go
2043 into these sections. */
2044 s->flags |= SEC_EXCLUDE;
2045 continue;
2046 }
2047
2048 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2049 continue;
2050
2051 /* Allocate memory for the section contents. We use bfd_zalloc
2052 here in case unused entries are not reclaimed before the
2053 section's contents are written out. This should not happen,
2054 but this way if it does, we get a R_LM32_NONE reloc instead
2055 of garbage. */
2056 s->contents = bfd_zalloc (dynobj, s->size);
2057 if (s->contents == NULL)
2058 return false;
2059 }
2060
2061 if (!_bfd_elf_add_dynamic_tags (output_bfd, info, relocs))
2062 return false;
2063
2064 /* Allocate .rofixup section. */
2065 if (IS_FDPIC (output_bfd))
2066 {
2067 struct weak_symbol_list *list_start = NULL, *list_end = NULL;
2068 int rgot_weak_count = 0;
2069 int r32_count = 0;
2070 int rgot_count = 0;
2071 /* Look for deleted sections. */
2072 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
2073 {
2074 for (s = ibfd->sections; s != NULL; s = s->next)
2075 {
2076 if (s->reloc_count)
2077 {
2078 /* Count relocs that need .rofixup entires. */
2079 Elf_Internal_Rela *internal_relocs, *end;
2080 internal_relocs = elf_section_data (s)->relocs;
2081 if (internal_relocs == NULL)
2082 internal_relocs = (_bfd_elf_link_read_relocs (ibfd, s, NULL, NULL, false));
2083 if (internal_relocs != NULL)
2084 {
2085 end = internal_relocs + s->reloc_count;
2086 while (internal_relocs < end)
2087 {
2088 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
2089 struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (ibfd);
2090 unsigned long r_symndx;
2091 struct elf_link_hash_entry *h;
2092
2093 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
2094 sym_hashes = elf_sym_hashes (ibfd);
2095 r_symndx = ELF32_R_SYM (internal_relocs->r_info);
2096 h = NULL;
2097 if (r_symndx < symtab_hdr->sh_info)
2098 {
2099 }
2100 else
2101 {
2102 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2103 while (h->root.type == bfd_link_hash_indirect
2104 || h->root.type == bfd_link_hash_warning)
2105 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2106 }
2107
2108 /* Don't generate entries for weak symbols. */
2109 if (!h || (h && h->root.type != bfd_link_hash_undefweak))
2110 {
2111 if (!discarded_section (s) && !((bfd_section_flags (s) & SEC_ALLOC) == 0))
2112 {
2113 switch (ELF32_R_TYPE (internal_relocs->r_info))
2114 {
2115 case R_LM32_32:
2116 r32_count++;
2117 break;
2118 case R_LM32_16_GOT:
2119 rgot_count++;
2120 break;
2121 }
2122 }
2123 }
2124 else
2125 {
2126 struct weak_symbol_list *current, *new_entry;
2127 /* Is this symbol already in the list? */
2128 for (current = list_start; current; current = current->next)
2129 {
2130 if (!strcmp (current->name, h->root.root.string))
2131 break;
2132 }
2133 if (!current && !discarded_section (s) && (bfd_section_flags (s) & SEC_ALLOC))
2134 {
2135 /* Will this have an entry in the GOT. */
2136 if (ELF32_R_TYPE (internal_relocs->r_info) == R_LM32_16_GOT)
2137 {
2138 /* Create a new entry. */
2139 new_entry = malloc (sizeof (struct weak_symbol_list));
2140 if (!new_entry)
2141 return false;
2142 new_entry->name = h->root.root.string;
2143 new_entry->next = NULL;
2144 /* Add to list */
2145 if (list_start == NULL)
2146 {
2147 list_start = new_entry;
2148 list_end = new_entry;
2149 }
2150 else
2151 {
2152 list_end->next = new_entry;
2153 list_end = new_entry;
2154 }
2155 /* Increase count of undefined weak symbols in the got. */
2156 rgot_weak_count++;
2157 }
2158 }
2159 }
2160 internal_relocs++;
2161 }
2162 }
2163 else
2164 return false;
2165 }
2166 }
2167 }
2168 /* Free list. */
2169 while (list_start)
2170 {
2171 list_end = list_start->next;
2172 free (list_start);
2173 list_start = list_end;
2174 }
2175
2176 /* Size sections. */
2177 lm32fdpic_fixup32_section (info)->size
2178 = (r32_count + (htab->root.sgot->size / 4) - rgot_weak_count + 1) * 4;
2179 if (lm32fdpic_fixup32_section (info)->size == 0)
2180 lm32fdpic_fixup32_section (info)->flags |= SEC_EXCLUDE;
2181 else
2182 {
2183 lm32fdpic_fixup32_section (info)->contents =
2184 bfd_zalloc (dynobj, lm32fdpic_fixup32_section (info)->size);
2185 if (lm32fdpic_fixup32_section (info)->contents == NULL)
2186 return false;
2187 }
2188 }
2189
2190 return true;
2191 }
2192
2193 /* Create dynamic sections when linking against a dynamic object. */
2194
2195 static bool
lm32_elf_create_dynamic_sections(bfd * abfd,struct bfd_link_info * info)2196 lm32_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
2197 {
2198 struct elf_lm32_link_hash_table *htab;
2199 flagword flags, pltflags;
2200 asection *s;
2201 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
2202 int ptralign = 2; /* 32bit */
2203
2204 htab = lm32_elf_hash_table (info);
2205 if (htab == NULL)
2206 return false;
2207
2208 /* Make sure we have a GOT - For the case where we have a dynamic object
2209 but none of the relocs in check_relocs */
2210 if (!_bfd_elf_create_got_section (abfd, info))
2211 return false;
2212 if (IS_FDPIC (abfd) && (htab->sfixup32 == NULL))
2213 {
2214 if (! create_rofixup_section (abfd, info))
2215 return false;
2216 }
2217
2218 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
2219 .rel[a].bss sections. */
2220 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
2221 | SEC_LINKER_CREATED);
2222
2223 pltflags = flags;
2224 pltflags |= SEC_CODE;
2225 if (bed->plt_not_loaded)
2226 pltflags &= ~ (SEC_LOAD | SEC_HAS_CONTENTS);
2227 if (bed->plt_readonly)
2228 pltflags |= SEC_READONLY;
2229
2230 s = bfd_make_section_anyway_with_flags (abfd, ".plt", pltflags);
2231 htab->root.splt = s;
2232 if (s == NULL
2233 || !bfd_set_section_alignment (s, bed->plt_alignment))
2234 return false;
2235
2236 if (bed->want_plt_sym)
2237 {
2238 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
2239 .plt section. */
2240 struct bfd_link_hash_entry *bh = NULL;
2241 struct elf_link_hash_entry *h;
2242
2243 if (! (_bfd_generic_link_add_one_symbol
2244 (info, abfd, "_PROCEDURE_LINKAGE_TABLE_", BSF_GLOBAL, s,
2245 (bfd_vma) 0, NULL, false,
2246 get_elf_backend_data (abfd)->collect, &bh)))
2247 return false;
2248 h = (struct elf_link_hash_entry *) bh;
2249 h->def_regular = 1;
2250 h->type = STT_OBJECT;
2251 htab->root.hplt = h;
2252
2253 if (bfd_link_pic (info)
2254 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2255 return false;
2256 }
2257
2258 s = bfd_make_section_anyway_with_flags (abfd,
2259 bed->default_use_rela_p
2260 ? ".rela.plt" : ".rel.plt",
2261 flags | SEC_READONLY);
2262 htab->root.srelplt = s;
2263 if (s == NULL
2264 || !bfd_set_section_alignment (s, ptralign))
2265 return false;
2266
2267 if (htab->root.sgot == NULL
2268 && !_bfd_elf_create_got_section (abfd, info))
2269 return false;
2270
2271 if (bed->want_dynbss)
2272 {
2273 /* The .dynbss section is a place to put symbols which are defined
2274 by dynamic objects, are referenced by regular objects, and are
2275 not functions. We must allocate space for them in the process
2276 image and use a R_*_COPY reloc to tell the dynamic linker to
2277 initialize them at run time. The linker script puts the .dynbss
2278 section into the .bss section of the final image. */
2279 s = bfd_make_section_anyway_with_flags (abfd, ".dynbss",
2280 SEC_ALLOC | SEC_LINKER_CREATED);
2281 htab->sdynbss = s;
2282 if (s == NULL)
2283 return false;
2284 /* The .rel[a].bss section holds copy relocs. This section is not
2285 normally needed. We need to create it here, though, so that the
2286 linker will map it to an output section. We can't just create it
2287 only if we need it, because we will not know whether we need it
2288 until we have seen all the input files, and the first time the
2289 main linker code calls BFD after examining all the input files
2290 (size_dynamic_sections) the input sections have already been
2291 mapped to the output sections. If the section turns out not to
2292 be needed, we can discard it later. We will never need this
2293 section when generating a shared object, since they do not use
2294 copy relocs. */
2295 if (! bfd_link_pic (info))
2296 {
2297 s = bfd_make_section_anyway_with_flags (abfd,
2298 (bed->default_use_rela_p
2299 ? ".rela.bss" : ".rel.bss"),
2300 flags | SEC_READONLY);
2301 htab->srelbss = s;
2302 if (s == NULL
2303 || !bfd_set_section_alignment (s, ptralign))
2304 return false;
2305 }
2306 }
2307
2308 return true;
2309 }
2310
2311 static bool
lm32_elf_always_size_sections(bfd * output_bfd,struct bfd_link_info * info)2312 lm32_elf_always_size_sections (bfd *output_bfd, struct bfd_link_info *info)
2313 {
2314 if (!bfd_link_relocatable (info))
2315 {
2316 if (!bfd_elf_stack_segment_size (output_bfd, info,
2317 "__stacksize", DEFAULT_STACK_SIZE))
2318 return false;
2319
2320 asection *sec = bfd_get_section_by_name (output_bfd, ".stack");
2321 if (sec)
2322 sec->size = info->stacksize >= 0 ? info->stacksize : 0;
2323 }
2324
2325 return true;
2326 }
2327
2328 static bool
lm32_elf_fdpic_copy_private_bfd_data(bfd * ibfd,bfd * obfd)2329 lm32_elf_fdpic_copy_private_bfd_data (bfd *ibfd, bfd *obfd)
2330 {
2331 unsigned i;
2332
2333 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
2334 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
2335 return true;
2336
2337 if (! _bfd_elf_copy_private_bfd_data (ibfd, obfd))
2338 return false;
2339
2340 if (! elf_tdata (ibfd) || ! elf_tdata (ibfd)->phdr
2341 || ! elf_tdata (obfd) || ! elf_tdata (obfd)->phdr)
2342 return true;
2343
2344 /* Copy the stack size. */
2345 for (i = 0; i < elf_elfheader (ibfd)->e_phnum; i++)
2346 if (elf_tdata (ibfd)->phdr[i].p_type == PT_GNU_STACK)
2347 {
2348 Elf_Internal_Phdr *iphdr = &elf_tdata (ibfd)->phdr[i];
2349
2350 for (i = 0; i < elf_elfheader (obfd)->e_phnum; i++)
2351 if (elf_tdata (obfd)->phdr[i].p_type == PT_GNU_STACK)
2352 {
2353 memcpy (&elf_tdata (obfd)->phdr[i], iphdr, sizeof (*iphdr));
2354
2355 /* Rewrite the phdrs, since we're only called after they were first written. */
2356 if (bfd_seek (obfd, (bfd_signed_vma) get_elf_backend_data (obfd)
2357 ->s->sizeof_ehdr, SEEK_SET) != 0
2358 || get_elf_backend_data (obfd)->s->write_out_phdrs (obfd, elf_tdata (obfd)->phdr,
2359 elf_elfheader (obfd)->e_phnum) != 0)
2360 return false;
2361 break;
2362 }
2363
2364 break;
2365 }
2366
2367 return true;
2368 }
2369
2370
2371 #define ELF_ARCH bfd_arch_lm32
2372 #define ELF_TARGET_ID LM32_ELF_DATA
2373 #define ELF_MACHINE_CODE EM_LATTICEMICO32
2374 #define ELF_MAXPAGESIZE 0x1000
2375
2376 #define TARGET_BIG_SYM lm32_elf32_vec
2377 #define TARGET_BIG_NAME "elf32-lm32"
2378
2379 #define bfd_elf32_bfd_reloc_type_lookup lm32_reloc_type_lookup
2380 #define bfd_elf32_bfd_reloc_name_lookup lm32_reloc_name_lookup
2381 #define elf_info_to_howto lm32_info_to_howto_rela
2382 #define elf_info_to_howto_rel NULL
2383 #define elf_backend_rela_normal 1
2384 #define elf_backend_object_p lm32_elf_object_p
2385 #define elf_backend_final_write_processing lm32_elf_final_write_processing
2386 #define elf_backend_stack_align 8
2387 #define elf_backend_can_gc_sections 1
2388 #define elf_backend_can_refcount 1
2389 #define elf_backend_gc_mark_hook lm32_elf_gc_mark_hook
2390 #define elf_backend_plt_readonly 1
2391 #define elf_backend_want_got_plt 1
2392 #define elf_backend_want_plt_sym 0
2393 #define elf_backend_got_header_size 12
2394 #define elf_backend_dtrel_excludes_plt 1
2395 #define bfd_elf32_bfd_link_hash_table_create lm32_elf_link_hash_table_create
2396 #define elf_backend_check_relocs lm32_elf_check_relocs
2397 #define elf_backend_reloc_type_class lm32_elf_reloc_type_class
2398 #define elf_backend_size_dynamic_sections lm32_elf_size_dynamic_sections
2399 #define elf_backend_omit_section_dynsym _bfd_elf_omit_section_dynsym_all
2400 #define elf_backend_create_dynamic_sections lm32_elf_create_dynamic_sections
2401 #define elf_backend_finish_dynamic_sections lm32_elf_finish_dynamic_sections
2402 #define elf_backend_adjust_dynamic_symbol lm32_elf_adjust_dynamic_symbol
2403 #define elf_backend_finish_dynamic_symbol lm32_elf_finish_dynamic_symbol
2404 #define elf_backend_relocate_section lm32_elf_relocate_section
2405
2406 #include "elf32-target.h"
2407
2408 #undef ELF_MAXPAGESIZE
2409 #define ELF_MAXPAGESIZE 0x4000
2410
2411
2412 #undef TARGET_BIG_SYM
2413 #define TARGET_BIG_SYM lm32_elf32_fdpic_vec
2414 #undef TARGET_BIG_NAME
2415 #define TARGET_BIG_NAME "elf32-lm32fdpic"
2416 #undef elf32_bed
2417 #define elf32_bed elf32_lm32fdpic_bed
2418
2419 #undef elf_backend_always_size_sections
2420 #define elf_backend_always_size_sections lm32_elf_always_size_sections
2421 #undef bfd_elf32_bfd_copy_private_bfd_data
2422 #define bfd_elf32_bfd_copy_private_bfd_data lm32_elf_fdpic_copy_private_bfd_data
2423
2424 #include "elf32-target.h"
2425