1 /* Lattice Mico32-specific support for 32-bit ELF
2 Copyright (C) 2008-2021 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 3, /* size (0 = byte, 1 = short, 2 = long) */
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 0, /* size (0 = byte, 1 = short, 2 = long) */
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 1, /* size (0 = byte, 1 = short, 2 = long) */
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 2, /* size (0 = byte, 1 = short, 2 = long) */
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 2, /* size (0 = byte, 1 = short, 2 = long) */
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 2, /* size (0 = byte, 1 = short, 2 = long) */
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 2, /* size (0 = byte, 1 = short, 2 = long) */
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 2, /* size (0 = byte, 1 = short, 2 = long) */
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 2, /* size (0 = byte, 1 = short, 2 = long) */
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 2, /* size (0 = byte, 1 = short, 2 = long) */
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 2, /* size (0 = byte, 1 = short, 2 = long) */
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 2, /* size (0 = byte, 1 = short, 2 = long) */
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 2, /* size (0 = byte, 1 = short, 2 = long) */
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 2, /* size (0 = byte, 1 = short, 2 = long) */
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 2, /* size (0 = byte, 1 = short, 2 = long) */
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 2, /* size (0 = byte, 1 = short, 2 = long) */
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 2, /* size (0 = byte, 1 = short, 2 = long) */
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 2, /* size (0 = byte, 1 = short, 2 = long) */
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, **sym_hashes_end;
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 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof (Elf32_External_Sym);
1135 if (!elf_bad_symtab (abfd))
1136 sym_hashes_end -= symtab_hdr->sh_info;
1137
1138 htab = lm32_elf_hash_table (info);
1139 if (htab == NULL)
1140 return false;
1141
1142 dynobj = htab->root.dynobj;
1143
1144 rel_end = relocs + sec->reloc_count;
1145 for (rel = relocs; rel < rel_end; rel++)
1146 {
1147 int r_type;
1148 struct elf_link_hash_entry *h;
1149 unsigned long r_symndx;
1150
1151 r_symndx = ELF32_R_SYM (rel->r_info);
1152 r_type = ELF32_R_TYPE (rel->r_info);
1153 if (r_symndx < symtab_hdr->sh_info)
1154 h = NULL;
1155 else
1156 {
1157 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1158 while (h->root.type == bfd_link_hash_indirect
1159 || h->root.type == bfd_link_hash_warning)
1160 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1161 }
1162
1163 /* Some relocs require a global offset table. */
1164 if (htab->root.sgot == NULL)
1165 {
1166 switch (r_type)
1167 {
1168 case R_LM32_16_GOT:
1169 case R_LM32_GOTOFF_HI16:
1170 case R_LM32_GOTOFF_LO16:
1171 if (dynobj == NULL)
1172 htab->root.dynobj = dynobj = abfd;
1173 if (!_bfd_elf_create_got_section (dynobj, info))
1174 return false;
1175 break;
1176 }
1177 }
1178
1179 /* Some relocs require a rofixup table. */
1180 if (IS_FDPIC (abfd))
1181 {
1182 switch (r_type)
1183 {
1184 case R_LM32_32:
1185 /* FDPIC requires a GOT if there is a .rofixup section
1186 (Normal ELF doesn't). */
1187 if (dynobj == NULL)
1188 htab->root.dynobj = dynobj = abfd;
1189 if (!_bfd_elf_create_got_section (dynobj, info))
1190 return false;
1191 /* Create .rofixup section */
1192 if (htab->sfixup32 == NULL)
1193 {
1194 if (! create_rofixup_section (dynobj, info))
1195 return false;
1196 }
1197 break;
1198 case R_LM32_16_GOT:
1199 case R_LM32_GOTOFF_HI16:
1200 case R_LM32_GOTOFF_LO16:
1201 /* Create .rofixup section. */
1202 if (htab->sfixup32 == NULL)
1203 {
1204 if (dynobj == NULL)
1205 htab->root.dynobj = dynobj = abfd;
1206 if (! create_rofixup_section (dynobj, info))
1207 return false;
1208 }
1209 break;
1210 }
1211 }
1212
1213 switch (r_type)
1214 {
1215 case R_LM32_16_GOT:
1216 if (h != NULL)
1217 h->got.refcount += 1;
1218 else
1219 {
1220 bfd_signed_vma *local_got_refcounts;
1221
1222 /* This is a global offset table entry for a local symbol. */
1223 local_got_refcounts = elf_local_got_refcounts (abfd);
1224 if (local_got_refcounts == NULL)
1225 {
1226 bfd_size_type size;
1227
1228 size = symtab_hdr->sh_info;
1229 size *= sizeof (bfd_signed_vma);
1230 local_got_refcounts = bfd_zalloc (abfd, size);
1231 if (local_got_refcounts == NULL)
1232 return false;
1233 elf_local_got_refcounts (abfd) = local_got_refcounts;
1234 }
1235 local_got_refcounts[r_symndx] += 1;
1236 }
1237 break;
1238
1239 /* This relocation describes the C++ object vtable hierarchy.
1240 Reconstruct it for later use during GC. */
1241 case R_LM32_GNU_VTINHERIT:
1242 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1243 return false;
1244 break;
1245
1246 /* This relocation describes which C++ vtable entries are actually
1247 used. Record for later use during GC. */
1248 case R_LM32_GNU_VTENTRY:
1249 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1250 return false;
1251 break;
1252
1253 }
1254 }
1255
1256 return true;
1257 }
1258
1259 /* Finish up the dynamic sections. */
1260
1261 static bool
lm32_elf_finish_dynamic_sections(bfd * output_bfd,struct bfd_link_info * info)1262 lm32_elf_finish_dynamic_sections (bfd *output_bfd,
1263 struct bfd_link_info *info)
1264 {
1265 struct elf_lm32_link_hash_table *htab;
1266 bfd *dynobj;
1267 asection *sdyn;
1268 asection *sgot;
1269
1270 htab = lm32_elf_hash_table (info);
1271 if (htab == NULL)
1272 return false;
1273
1274 dynobj = htab->root.dynobj;
1275
1276 sgot = htab->root.sgotplt;
1277 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
1278
1279 if (htab->root.dynamic_sections_created)
1280 {
1281 asection *splt;
1282 Elf32_External_Dyn *dyncon, *dynconend;
1283
1284 BFD_ASSERT (sgot != NULL && sdyn != NULL);
1285
1286 dyncon = (Elf32_External_Dyn *) sdyn->contents;
1287 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
1288
1289 for (; dyncon < dynconend; dyncon++)
1290 {
1291 Elf_Internal_Dyn dyn;
1292 asection *s;
1293
1294 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
1295
1296 switch (dyn.d_tag)
1297 {
1298 default:
1299 break;
1300
1301 case DT_PLTGOT:
1302 s = htab->root.sgotplt;
1303 goto get_vma;
1304 case DT_JMPREL:
1305 s = htab->root.srelplt;
1306 get_vma:
1307 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
1308 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1309 break;
1310
1311 case DT_PLTRELSZ:
1312 s = htab->root.srelplt;
1313 dyn.d_un.d_val = s->size;
1314 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1315 break;
1316 }
1317 }
1318
1319 /* Fill in the first entry in the procedure linkage table. */
1320 splt = htab->root.splt;
1321 if (splt && splt->size > 0)
1322 {
1323 if (bfd_link_pic (info))
1324 {
1325 bfd_put_32 (output_bfd, PLT0_PIC_ENTRY_WORD0, splt->contents);
1326 bfd_put_32 (output_bfd, PLT0_PIC_ENTRY_WORD1, splt->contents + 4);
1327 bfd_put_32 (output_bfd, PLT0_PIC_ENTRY_WORD2, splt->contents + 8);
1328 bfd_put_32 (output_bfd, PLT0_PIC_ENTRY_WORD3, splt->contents + 12);
1329 bfd_put_32 (output_bfd, PLT0_PIC_ENTRY_WORD4, splt->contents + 16);
1330 }
1331 else
1332 {
1333 unsigned long addr;
1334 /* addr = .got + 4 */
1335 addr = sgot->output_section->vma + sgot->output_offset + 4;
1336 bfd_put_32 (output_bfd,
1337 PLT0_ENTRY_WORD0 | ((addr >> 16) & 0xffff),
1338 splt->contents);
1339 bfd_put_32 (output_bfd,
1340 PLT0_ENTRY_WORD1 | (addr & 0xffff),
1341 splt->contents + 4);
1342 bfd_put_32 (output_bfd, PLT0_ENTRY_WORD2, splt->contents + 8);
1343 bfd_put_32 (output_bfd, PLT0_ENTRY_WORD3, splt->contents + 12);
1344 bfd_put_32 (output_bfd, PLT0_ENTRY_WORD4, splt->contents + 16);
1345 }
1346
1347 elf_section_data (splt->output_section)->this_hdr.sh_entsize =
1348 PLT_ENTRY_SIZE;
1349 }
1350 }
1351
1352 /* Fill in the first three entries in the global offset table. */
1353 if (sgot && sgot->size > 0)
1354 {
1355 if (sdyn == NULL)
1356 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
1357 else
1358 bfd_put_32 (output_bfd,
1359 sdyn->output_section->vma + sdyn->output_offset,
1360 sgot->contents);
1361 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
1362 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
1363
1364 /* FIXME: This can be null if create_dynamic_sections wasn't called. */
1365 if (elf_section_data (sgot->output_section) != NULL)
1366 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
1367 }
1368
1369 if (lm32fdpic_fixup32_section (info))
1370 {
1371 struct elf_link_hash_entry *hgot = elf_hash_table (info)->hgot;
1372 bfd_vma got_value = hgot->root.u.def.value
1373 + hgot->root.u.def.section->output_section->vma
1374 + hgot->root.u.def.section->output_offset;
1375 struct bfd_link_hash_entry *hend;
1376
1377 /* Last entry is pointer to GOT. */
1378 _lm32fdpic_add_rofixup (output_bfd, lm32fdpic_fixup32_section (info), got_value);
1379
1380 /* Check we wrote enough entries. */
1381 if (lm32fdpic_fixup32_section (info)->size
1382 != (lm32fdpic_fixup32_section (info)->reloc_count * 4))
1383 {
1384 _bfd_error_handler
1385 ("LINKER BUG: .rofixup section size mismatch: size/4 %" PRId64
1386 " != relocs %d",
1387 (int64_t) (lm32fdpic_fixup32_section (info)->size / 4),
1388 lm32fdpic_fixup32_section (info)->reloc_count);
1389 return false;
1390 }
1391
1392 hend = bfd_link_hash_lookup (info->hash, "__ROFIXUP_END__",
1393 false, false, true);
1394 if (hend
1395 && (hend->type == bfd_link_hash_defined
1396 || hend->type == bfd_link_hash_defweak)
1397 && hend->u.def.section->output_section != NULL)
1398 {
1399 bfd_vma value =
1400 lm32fdpic_fixup32_section (info)->output_section->vma
1401 + lm32fdpic_fixup32_section (info)->output_offset
1402 + lm32fdpic_fixup32_section (info)->size
1403 - hend->u.def.section->output_section->vma
1404 - hend->u.def.section->output_offset;
1405 BFD_ASSERT (hend->u.def.value == value);
1406 if (hend->u.def.value != value)
1407 {
1408 _bfd_error_handler
1409 ("LINKER BUG: .rofixup section hend->u.def.value != value: %"
1410 PRId64 " != %" PRId64,
1411 (int64_t) hend->u.def.value, (int64_t) value);
1412 return false;
1413 }
1414 }
1415 }
1416
1417 return true;
1418 }
1419
1420 /* Finish up dynamic symbol handling. We set the contents of various
1421 dynamic sections here. */
1422
1423 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)1424 lm32_elf_finish_dynamic_symbol (bfd *output_bfd,
1425 struct bfd_link_info *info,
1426 struct elf_link_hash_entry *h,
1427 Elf_Internal_Sym *sym)
1428 {
1429 struct elf_lm32_link_hash_table *htab;
1430 bfd_byte *loc;
1431
1432 htab = lm32_elf_hash_table (info);
1433 if (htab == NULL)
1434 return false;
1435
1436 if (h->plt.offset != (bfd_vma) -1)
1437 {
1438 asection *splt;
1439 asection *sgot;
1440 asection *srela;
1441
1442 bfd_vma plt_index;
1443 bfd_vma got_offset;
1444 Elf_Internal_Rela rela;
1445
1446 /* This symbol has an entry in the procedure linkage table. Set
1447 it up. */
1448 BFD_ASSERT (h->dynindx != -1);
1449
1450 splt = htab->root.splt;
1451 sgot = htab->root.sgotplt;
1452 srela = htab->root.srelplt;
1453 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1454
1455 /* Get the index in the procedure linkage table which
1456 corresponds to this symbol. This is the index of this symbol
1457 in all the symbols for which we are making plt entries. The
1458 first entry in the procedure linkage table is reserved. */
1459 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1460
1461 /* Get the offset into the .got table of the entry that
1462 corresponds to this function. Each .got entry is 4 bytes.
1463 The first three are reserved. */
1464 got_offset = (plt_index + 3) * 4;
1465
1466 /* Fill in the entry in the procedure linkage table. */
1467 if (! bfd_link_pic (info))
1468 {
1469 /* TODO */
1470 }
1471 else
1472 {
1473 /* TODO */
1474 }
1475
1476 /* Fill in the entry in the global offset table. */
1477 bfd_put_32 (output_bfd,
1478 (splt->output_section->vma
1479 + splt->output_offset
1480 + h->plt.offset
1481 + 12), /* same offset */
1482 sgot->contents + got_offset);
1483
1484 /* Fill in the entry in the .rela.plt section. */
1485 rela.r_offset = (sgot->output_section->vma
1486 + sgot->output_offset
1487 + got_offset);
1488 rela.r_info = ELF32_R_INFO (h->dynindx, R_LM32_JMP_SLOT);
1489 rela.r_addend = 0;
1490 loc = srela->contents;
1491 loc += plt_index * sizeof (Elf32_External_Rela);
1492 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1493
1494 if (!h->def_regular)
1495 {
1496 /* Mark the symbol as undefined, rather than as defined in
1497 the .plt section. Leave the value alone. */
1498 sym->st_shndx = SHN_UNDEF;
1499 }
1500
1501 }
1502
1503 if (h->got.offset != (bfd_vma) -1)
1504 {
1505 asection *sgot;
1506 asection *srela;
1507 Elf_Internal_Rela rela;
1508
1509 /* This symbol has an entry in the global offset table. Set it
1510 up. */
1511 sgot = htab->root.sgot;
1512 srela = htab->root.srelgot;
1513 BFD_ASSERT (sgot != NULL && srela != NULL);
1514
1515 rela.r_offset = (sgot->output_section->vma
1516 + sgot->output_offset
1517 + (h->got.offset &~ 1));
1518
1519 /* If this is a -Bsymbolic link, and the symbol is defined
1520 locally, we just want to emit a RELATIVE reloc. Likewise if
1521 the symbol was forced to be local because of a version file.
1522 The entry in the global offset table will already have been
1523 initialized in the relocate_section function. */
1524 if (bfd_link_pic (info)
1525 && (info->symbolic
1526 || h->dynindx == -1
1527 || h->forced_local)
1528 && h->def_regular)
1529 {
1530 rela.r_info = ELF32_R_INFO (0, R_LM32_RELATIVE);
1531 rela.r_addend = (h->root.u.def.value
1532 + h->root.u.def.section->output_section->vma
1533 + h->root.u.def.section->output_offset);
1534 }
1535 else
1536 {
1537 BFD_ASSERT ((h->got.offset & 1) == 0);
1538 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset);
1539 rela.r_info = ELF32_R_INFO (h->dynindx, R_LM32_GLOB_DAT);
1540 rela.r_addend = 0;
1541 }
1542
1543 loc = srela->contents;
1544 loc += srela->reloc_count * sizeof (Elf32_External_Rela);
1545 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1546 ++srela->reloc_count;
1547 }
1548
1549 if (h->needs_copy)
1550 {
1551 asection *s;
1552 Elf_Internal_Rela rela;
1553
1554 /* This symbols needs a copy reloc. Set it up. */
1555 BFD_ASSERT (h->dynindx != -1
1556 && (h->root.type == bfd_link_hash_defined
1557 || h->root.type == bfd_link_hash_defweak));
1558
1559 s = bfd_get_linker_section (htab->root.dynobj, ".rela.bss");
1560 BFD_ASSERT (s != NULL);
1561
1562 rela.r_offset = (h->root.u.def.value
1563 + h->root.u.def.section->output_section->vma
1564 + h->root.u.def.section->output_offset);
1565 rela.r_info = ELF32_R_INFO (h->dynindx, R_LM32_COPY);
1566 rela.r_addend = 0;
1567 loc = s->contents;
1568 loc += s->reloc_count * sizeof (Elf32_External_Rela);
1569 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1570 ++s->reloc_count;
1571 }
1572
1573 /* Mark some specially defined symbols as absolute. */
1574 if (h == htab->root.hdynamic || h == htab->root.hgot)
1575 sym->st_shndx = SHN_ABS;
1576
1577 return true;
1578 }
1579
1580 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)1581 lm32_elf_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
1582 const asection *rel_sec ATTRIBUTE_UNUSED,
1583 const Elf_Internal_Rela *rela)
1584 {
1585 switch ((int) ELF32_R_TYPE (rela->r_info))
1586 {
1587 case R_LM32_RELATIVE: return reloc_class_relative;
1588 case R_LM32_JMP_SLOT: return reloc_class_plt;
1589 case R_LM32_COPY: return reloc_class_copy;
1590 default: return reloc_class_normal;
1591 }
1592 }
1593
1594 /* Adjust a symbol defined by a dynamic object and referenced by a
1595 regular object. The current definition is in some section of the
1596 dynamic object, but we're not including those sections. We have to
1597 change the definition to something the rest of the link can
1598 understand. */
1599
1600 static bool
lm32_elf_adjust_dynamic_symbol(struct bfd_link_info * info,struct elf_link_hash_entry * h)1601 lm32_elf_adjust_dynamic_symbol (struct bfd_link_info *info,
1602 struct elf_link_hash_entry *h)
1603 {
1604 struct elf_lm32_link_hash_table *htab;
1605 bfd *dynobj;
1606 asection *s;
1607
1608 dynobj = elf_hash_table (info)->dynobj;
1609
1610 /* Make sure we know what is going on here. */
1611 BFD_ASSERT (dynobj != NULL
1612 && (h->needs_plt
1613 || h->is_weakalias
1614 || (h->def_dynamic
1615 && h->ref_regular
1616 && !h->def_regular)));
1617
1618 /* If this is a function, put it in the procedure linkage table. We
1619 will fill in the contents of the procedure linkage table later,
1620 when we know the address of the .got section. */
1621 if (h->type == STT_FUNC
1622 || h->needs_plt)
1623 {
1624 if (! bfd_link_pic (info)
1625 && !h->def_dynamic
1626 && !h->ref_dynamic
1627 && h->root.type != bfd_link_hash_undefweak
1628 && h->root.type != bfd_link_hash_undefined)
1629 {
1630 /* This case can occur if we saw a PLT reloc in an input
1631 file, but the symbol was never referred to by a dynamic
1632 object. In such a case, we don't actually need to build
1633 a procedure linkage table, and we can just do a PCREL
1634 reloc instead. */
1635 h->plt.offset = (bfd_vma) -1;
1636 h->needs_plt = 0;
1637 }
1638
1639 return true;
1640 }
1641 else
1642 h->plt.offset = (bfd_vma) -1;
1643
1644 /* If this is a weak symbol, and there is a real definition, the
1645 processor independent code will have arranged for us to see the
1646 real definition first, and we can just use the same value. */
1647 if (h->is_weakalias)
1648 {
1649 struct elf_link_hash_entry *def = weakdef (h);
1650 BFD_ASSERT (def->root.type == bfd_link_hash_defined);
1651 h->root.u.def.section = def->root.u.def.section;
1652 h->root.u.def.value = def->root.u.def.value;
1653 return true;
1654 }
1655
1656 /* This is a reference to a symbol defined by a dynamic object which
1657 is not a function. */
1658
1659 /* If we are creating a shared library, we must presume that the
1660 only references to the symbol are via the global offset table.
1661 For such cases we need not do anything here; the relocations will
1662 be handled correctly by relocate_section. */
1663 if (bfd_link_pic (info))
1664 return true;
1665
1666 /* If there are no references to this symbol that do not use the
1667 GOT, we don't need to generate a copy reloc. */
1668 if (!h->non_got_ref)
1669 return true;
1670
1671 /* If -z nocopyreloc was given, we won't generate them either. */
1672 if (0 && info->nocopyreloc)
1673 {
1674 h->non_got_ref = 0;
1675 return true;
1676 }
1677
1678 /* If we don't find any dynamic relocs in read-only sections, then
1679 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1680 if (0 && !_bfd_elf_readonly_dynrelocs (h))
1681 {
1682 h->non_got_ref = 0;
1683 return true;
1684 }
1685
1686 /* We must allocate the symbol in our .dynbss section, which will
1687 become part of the .bss section of the executable. There will be
1688 an entry for this symbol in the .dynsym section. The dynamic
1689 object will contain position independent code, so all references
1690 from the dynamic object to this symbol will go through the global
1691 offset table. The dynamic linker will use the .dynsym entry to
1692 determine the address it must put in the global offset table, so
1693 both the dynamic object and the regular object will refer to the
1694 same memory location for the variable. */
1695
1696 htab = lm32_elf_hash_table (info);
1697 if (htab == NULL)
1698 return false;
1699
1700 s = htab->sdynbss;
1701 BFD_ASSERT (s != NULL);
1702
1703 /* We must generate a R_LM32_COPY reloc to tell the dynamic linker
1704 to copy the initial value out of the dynamic object and into the
1705 runtime process image. We need to remember the offset into the
1706 .rela.bss section we are going to use. */
1707 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
1708 {
1709 asection *srel;
1710
1711 srel = htab->srelbss;
1712 BFD_ASSERT (srel != NULL);
1713 srel->size += sizeof (Elf32_External_Rela);
1714 h->needs_copy = 1;
1715 }
1716
1717 return _bfd_elf_adjust_dynamic_copy (info, h, s);
1718 }
1719
1720 /* Allocate space in .plt, .got and associated reloc sections for
1721 dynamic relocs. */
1722
1723 static bool
allocate_dynrelocs(struct elf_link_hash_entry * h,void * inf)1724 allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
1725 {
1726 struct bfd_link_info *info;
1727 struct elf_lm32_link_hash_table *htab;
1728 struct elf_dyn_relocs *p;
1729
1730 if (h->root.type == bfd_link_hash_indirect)
1731 return true;
1732
1733 info = (struct bfd_link_info *) inf;
1734 htab = lm32_elf_hash_table (info);
1735 if (htab == NULL)
1736 return false;
1737
1738 if (htab->root.dynamic_sections_created
1739 && h->plt.refcount > 0)
1740 {
1741 /* Make sure this symbol is output as a dynamic symbol.
1742 Undefined weak syms won't yet be marked as dynamic. */
1743 if (h->dynindx == -1
1744 && !h->forced_local)
1745 {
1746 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1747 return false;
1748 }
1749
1750 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, bfd_link_pic (info), h))
1751 {
1752 asection *s = htab->root.splt;
1753
1754 /* If this is the first .plt entry, make room for the special
1755 first entry. */
1756 if (s->size == 0)
1757 s->size += PLT_ENTRY_SIZE;
1758
1759 h->plt.offset = s->size;
1760
1761 /* If this symbol is not defined in a regular file, and we are
1762 not generating a shared library, then set the symbol to this
1763 location in the .plt. This is required to make function
1764 pointers compare as equal between the normal executable and
1765 the shared library. */
1766 if (! bfd_link_pic (info)
1767 && !h->def_regular)
1768 {
1769 h->root.u.def.section = s;
1770 h->root.u.def.value = h->plt.offset;
1771 }
1772
1773 /* Make room for this entry. */
1774 s->size += PLT_ENTRY_SIZE;
1775
1776 /* We also need to make an entry in the .got.plt section, which
1777 will be placed in the .got section by the linker script. */
1778 htab->root.sgotplt->size += 4;
1779
1780 /* We also need to make an entry in the .rel.plt section. */
1781 htab->root.srelplt->size += sizeof (Elf32_External_Rela);
1782 }
1783 else
1784 {
1785 h->plt.offset = (bfd_vma) -1;
1786 h->needs_plt = 0;
1787 }
1788 }
1789 else
1790 {
1791 h->plt.offset = (bfd_vma) -1;
1792 h->needs_plt = 0;
1793 }
1794
1795 if (h->got.refcount > 0)
1796 {
1797 asection *s;
1798 bool dyn;
1799
1800 /* Make sure this symbol is output as a dynamic symbol.
1801 Undefined weak syms won't yet be marked as dynamic. */
1802 if (h->dynindx == -1
1803 && !h->forced_local)
1804 {
1805 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1806 return false;
1807 }
1808
1809 s = htab->root.sgot;
1810
1811 h->got.offset = s->size;
1812 s->size += 4;
1813 dyn = htab->root.dynamic_sections_created;
1814 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, bfd_link_pic (info), h))
1815 htab->root.srelgot->size += sizeof (Elf32_External_Rela);
1816 }
1817 else
1818 h->got.offset = (bfd_vma) -1;
1819
1820 if (h->dyn_relocs == NULL)
1821 return true;
1822
1823 /* In the shared -Bsymbolic case, discard space allocated for
1824 dynamic pc-relative relocs against symbols which turn out to be
1825 defined in regular objects. For the normal shared case, discard
1826 space for pc-relative relocs that have become local due to symbol
1827 visibility changes. */
1828
1829 if (bfd_link_pic (info))
1830 {
1831 if (h->def_regular
1832 && (h->forced_local
1833 || info->symbolic))
1834 {
1835 struct elf_dyn_relocs **pp;
1836
1837 for (pp = &h->dyn_relocs; (p = *pp) != NULL;)
1838 {
1839 p->count -= p->pc_count;
1840 p->pc_count = 0;
1841 if (p->count == 0)
1842 *pp = p->next;
1843 else
1844 pp = &p->next;
1845 }
1846 }
1847
1848 /* Also discard relocs on undefined weak syms with non-default
1849 visibility. */
1850 if (h->dyn_relocs != NULL
1851 && h->root.type == bfd_link_hash_undefweak)
1852 {
1853 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
1854 h->dyn_relocs = NULL;
1855
1856 /* Make sure undefined weak symbols are output as a dynamic
1857 symbol in PIEs. */
1858 else if (h->dynindx == -1
1859 && !h->forced_local)
1860 {
1861 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1862 return false;
1863 }
1864 }
1865 }
1866 else
1867 {
1868 /* For the non-shared case, discard space for relocs against
1869 symbols which turn out to need copy relocs or are not
1870 dynamic. */
1871
1872 if (!h->non_got_ref
1873 && ((h->def_dynamic
1874 && !h->def_regular)
1875 || (htab->root.dynamic_sections_created
1876 && (h->root.type == bfd_link_hash_undefweak
1877 || h->root.type == bfd_link_hash_undefined))))
1878 {
1879 /* Make sure this symbol is output as a dynamic symbol.
1880 Undefined weak syms won't yet be marked as dynamic. */
1881 if (h->dynindx == -1
1882 && !h->forced_local)
1883 {
1884 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1885 return false;
1886 }
1887
1888 /* If that succeeded, we know we'll be keeping all the
1889 relocs. */
1890 if (h->dynindx != -1)
1891 goto keep;
1892 }
1893
1894 h->dyn_relocs = NULL;
1895
1896 keep: ;
1897 }
1898
1899 /* Finally, allocate space. */
1900 for (p = h->dyn_relocs; p != NULL; p = p->next)
1901 {
1902 asection *sreloc = elf_section_data (p->sec)->sreloc;
1903 sreloc->size += p->count * sizeof (Elf32_External_Rela);
1904 }
1905
1906 return true;
1907 }
1908
1909 /* Set the sizes of the dynamic sections. */
1910
1911 static bool
lm32_elf_size_dynamic_sections(bfd * output_bfd,struct bfd_link_info * info)1912 lm32_elf_size_dynamic_sections (bfd *output_bfd,
1913 struct bfd_link_info *info)
1914 {
1915 struct elf_lm32_link_hash_table *htab;
1916 bfd *dynobj;
1917 asection *s;
1918 bool relocs;
1919 bfd *ibfd;
1920
1921 htab = lm32_elf_hash_table (info);
1922 if (htab == NULL)
1923 return false;
1924
1925 dynobj = htab->root.dynobj;
1926 BFD_ASSERT (dynobj != NULL);
1927
1928 if (htab->root.dynamic_sections_created)
1929 {
1930 /* Set the contents of the .interp section to the interpreter. */
1931 if (bfd_link_executable (info) && !info->nointerp)
1932 {
1933 s = bfd_get_linker_section (dynobj, ".interp");
1934 BFD_ASSERT (s != NULL);
1935 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1936 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1937 }
1938 }
1939
1940 /* Set up .got offsets for local syms, and space for local dynamic
1941 relocs. */
1942 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
1943 {
1944 bfd_signed_vma *local_got;
1945 bfd_signed_vma *end_local_got;
1946 bfd_size_type locsymcount;
1947 Elf_Internal_Shdr *symtab_hdr;
1948 asection *srel;
1949
1950 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
1951 continue;
1952
1953 for (s = ibfd->sections; s != NULL; s = s->next)
1954 {
1955 struct elf_dyn_relocs *p;
1956
1957 for (p = ((struct elf_dyn_relocs *)
1958 elf_section_data (s)->local_dynrel);
1959 p != NULL;
1960 p = p->next)
1961 {
1962 if (! bfd_is_abs_section (p->sec)
1963 && bfd_is_abs_section (p->sec->output_section))
1964 {
1965 /* Input section has been discarded, either because
1966 it is a copy of a linkonce section or due to
1967 linker script /DISCARD/, so we'll be discarding
1968 the relocs too. */
1969 }
1970 else if (p->count != 0)
1971 {
1972 srel = elf_section_data (p->sec)->sreloc;
1973 srel->size += p->count * sizeof (Elf32_External_Rela);
1974 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
1975 info->flags |= DF_TEXTREL;
1976 }
1977 }
1978 }
1979
1980 local_got = elf_local_got_refcounts (ibfd);
1981 if (!local_got)
1982 continue;
1983
1984 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
1985 locsymcount = symtab_hdr->sh_info;
1986 end_local_got = local_got + locsymcount;
1987 s = htab->root.sgot;
1988 srel = htab->root.srelgot;
1989 for (; local_got < end_local_got; ++local_got)
1990 {
1991 if (*local_got > 0)
1992 {
1993 *local_got = s->size;
1994 s->size += 4;
1995 if (bfd_link_pic (info))
1996 srel->size += sizeof (Elf32_External_Rela);
1997 }
1998 else
1999 *local_got = (bfd_vma) -1;
2000 }
2001 }
2002
2003 /* Allocate global sym .plt and .got entries, and space for global
2004 sym dynamic relocs. */
2005 elf_link_hash_traverse (&htab->root, allocate_dynrelocs, info);
2006
2007 /* We now have determined the sizes of the various dynamic sections.
2008 Allocate memory for them. */
2009 relocs = false;
2010 for (s = dynobj->sections; s != NULL; s = s->next)
2011 {
2012 if ((s->flags & SEC_LINKER_CREATED) == 0)
2013 continue;
2014
2015 if (s == htab->root.splt
2016 || s == htab->root.sgot
2017 || s == htab->root.sgotplt
2018 || s == htab->sdynbss)
2019 {
2020 /* Strip this section if we don't need it; see the
2021 comment below. */
2022 }
2023 else if (startswith (bfd_section_name (s), ".rela"))
2024 {
2025 if (s->size != 0 && s != htab->root.srelplt)
2026 relocs = true;
2027
2028 /* We use the reloc_count field as a counter if we need
2029 to copy relocs into the output file. */
2030 s->reloc_count = 0;
2031 }
2032 else
2033 /* It's not one of our sections, so don't allocate space. */
2034 continue;
2035
2036 if (s->size == 0)
2037 {
2038 /* If we don't need this section, strip it from the
2039 output file. This is mostly to handle .rela.bss and
2040 .rela.plt. We must create both sections in
2041 create_dynamic_sections, because they must be created
2042 before the linker maps input sections to output
2043 sections. The linker does that before
2044 adjust_dynamic_symbol is called, and it is that
2045 function which decides whether anything needs to go
2046 into these sections. */
2047 s->flags |= SEC_EXCLUDE;
2048 continue;
2049 }
2050
2051 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2052 continue;
2053
2054 /* Allocate memory for the section contents. We use bfd_zalloc
2055 here in case unused entries are not reclaimed before the
2056 section's contents are written out. This should not happen,
2057 but this way if it does, we get a R_LM32_NONE reloc instead
2058 of garbage. */
2059 s->contents = bfd_zalloc (dynobj, s->size);
2060 if (s->contents == NULL)
2061 return false;
2062 }
2063
2064 if (!_bfd_elf_add_dynamic_tags (output_bfd, info, relocs))
2065 return false;
2066
2067 /* Allocate .rofixup section. */
2068 if (IS_FDPIC (output_bfd))
2069 {
2070 struct weak_symbol_list *list_start = NULL, *list_end = NULL;
2071 int rgot_weak_count = 0;
2072 int r32_count = 0;
2073 int rgot_count = 0;
2074 /* Look for deleted sections. */
2075 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
2076 {
2077 for (s = ibfd->sections; s != NULL; s = s->next)
2078 {
2079 if (s->reloc_count)
2080 {
2081 /* Count relocs that need .rofixup entires. */
2082 Elf_Internal_Rela *internal_relocs, *end;
2083 internal_relocs = elf_section_data (s)->relocs;
2084 if (internal_relocs == NULL)
2085 internal_relocs = (_bfd_elf_link_read_relocs (ibfd, s, NULL, NULL, false));
2086 if (internal_relocs != NULL)
2087 {
2088 end = internal_relocs + s->reloc_count;
2089 while (internal_relocs < end)
2090 {
2091 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
2092 struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (ibfd);
2093 unsigned long r_symndx;
2094 struct elf_link_hash_entry *h;
2095
2096 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
2097 sym_hashes = elf_sym_hashes (ibfd);
2098 r_symndx = ELF32_R_SYM (internal_relocs->r_info);
2099 h = NULL;
2100 if (r_symndx < symtab_hdr->sh_info)
2101 {
2102 }
2103 else
2104 {
2105 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2106 while (h->root.type == bfd_link_hash_indirect
2107 || h->root.type == bfd_link_hash_warning)
2108 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2109 }
2110
2111 /* Don't generate entries for weak symbols. */
2112 if (!h || (h && h->root.type != bfd_link_hash_undefweak))
2113 {
2114 if (!discarded_section (s) && !((bfd_section_flags (s) & SEC_ALLOC) == 0))
2115 {
2116 switch (ELF32_R_TYPE (internal_relocs->r_info))
2117 {
2118 case R_LM32_32:
2119 r32_count++;
2120 break;
2121 case R_LM32_16_GOT:
2122 rgot_count++;
2123 break;
2124 }
2125 }
2126 }
2127 else
2128 {
2129 struct weak_symbol_list *current, *new_entry;
2130 /* Is this symbol already in the list? */
2131 for (current = list_start; current; current = current->next)
2132 {
2133 if (!strcmp (current->name, h->root.root.string))
2134 break;
2135 }
2136 if (!current && !discarded_section (s) && (bfd_section_flags (s) & SEC_ALLOC))
2137 {
2138 /* Will this have an entry in the GOT. */
2139 if (ELF32_R_TYPE (internal_relocs->r_info) == R_LM32_16_GOT)
2140 {
2141 /* Create a new entry. */
2142 new_entry = malloc (sizeof (struct weak_symbol_list));
2143 if (!new_entry)
2144 return false;
2145 new_entry->name = h->root.root.string;
2146 new_entry->next = NULL;
2147 /* Add to list */
2148 if (list_start == NULL)
2149 {
2150 list_start = new_entry;
2151 list_end = new_entry;
2152 }
2153 else
2154 {
2155 list_end->next = new_entry;
2156 list_end = new_entry;
2157 }
2158 /* Increase count of undefined weak symbols in the got. */
2159 rgot_weak_count++;
2160 }
2161 }
2162 }
2163 internal_relocs++;
2164 }
2165 }
2166 else
2167 return false;
2168 }
2169 }
2170 }
2171 /* Free list. */
2172 while (list_start)
2173 {
2174 list_end = list_start->next;
2175 free (list_start);
2176 list_start = list_end;
2177 }
2178
2179 /* Size sections. */
2180 lm32fdpic_fixup32_section (info)->size
2181 = (r32_count + (htab->root.sgot->size / 4) - rgot_weak_count + 1) * 4;
2182 if (lm32fdpic_fixup32_section (info)->size == 0)
2183 lm32fdpic_fixup32_section (info)->flags |= SEC_EXCLUDE;
2184 else
2185 {
2186 lm32fdpic_fixup32_section (info)->contents =
2187 bfd_zalloc (dynobj, lm32fdpic_fixup32_section (info)->size);
2188 if (lm32fdpic_fixup32_section (info)->contents == NULL)
2189 return false;
2190 }
2191 }
2192
2193 return true;
2194 }
2195
2196 /* Create dynamic sections when linking against a dynamic object. */
2197
2198 static bool
lm32_elf_create_dynamic_sections(bfd * abfd,struct bfd_link_info * info)2199 lm32_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
2200 {
2201 struct elf_lm32_link_hash_table *htab;
2202 flagword flags, pltflags;
2203 asection *s;
2204 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
2205 int ptralign = 2; /* 32bit */
2206
2207 htab = lm32_elf_hash_table (info);
2208 if (htab == NULL)
2209 return false;
2210
2211 /* Make sure we have a GOT - For the case where we have a dynamic object
2212 but none of the relocs in check_relocs */
2213 if (!_bfd_elf_create_got_section (abfd, info))
2214 return false;
2215 if (IS_FDPIC (abfd) && (htab->sfixup32 == NULL))
2216 {
2217 if (! create_rofixup_section (abfd, info))
2218 return false;
2219 }
2220
2221 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
2222 .rel[a].bss sections. */
2223 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
2224 | SEC_LINKER_CREATED);
2225
2226 pltflags = flags;
2227 pltflags |= SEC_CODE;
2228 if (bed->plt_not_loaded)
2229 pltflags &= ~ (SEC_LOAD | SEC_HAS_CONTENTS);
2230 if (bed->plt_readonly)
2231 pltflags |= SEC_READONLY;
2232
2233 s = bfd_make_section_anyway_with_flags (abfd, ".plt", pltflags);
2234 htab->root.splt = s;
2235 if (s == NULL
2236 || !bfd_set_section_alignment (s, bed->plt_alignment))
2237 return false;
2238
2239 if (bed->want_plt_sym)
2240 {
2241 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
2242 .plt section. */
2243 struct bfd_link_hash_entry *bh = NULL;
2244 struct elf_link_hash_entry *h;
2245
2246 if (! (_bfd_generic_link_add_one_symbol
2247 (info, abfd, "_PROCEDURE_LINKAGE_TABLE_", BSF_GLOBAL, s,
2248 (bfd_vma) 0, NULL, false,
2249 get_elf_backend_data (abfd)->collect, &bh)))
2250 return false;
2251 h = (struct elf_link_hash_entry *) bh;
2252 h->def_regular = 1;
2253 h->type = STT_OBJECT;
2254 htab->root.hplt = h;
2255
2256 if (bfd_link_pic (info)
2257 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2258 return false;
2259 }
2260
2261 s = bfd_make_section_anyway_with_flags (abfd,
2262 bed->default_use_rela_p
2263 ? ".rela.plt" : ".rel.plt",
2264 flags | SEC_READONLY);
2265 htab->root.srelplt = s;
2266 if (s == NULL
2267 || !bfd_set_section_alignment (s, ptralign))
2268 return false;
2269
2270 if (htab->root.sgot == NULL
2271 && !_bfd_elf_create_got_section (abfd, info))
2272 return false;
2273
2274 if (bed->want_dynbss)
2275 {
2276 /* The .dynbss section is a place to put symbols which are defined
2277 by dynamic objects, are referenced by regular objects, and are
2278 not functions. We must allocate space for them in the process
2279 image and use a R_*_COPY reloc to tell the dynamic linker to
2280 initialize them at run time. The linker script puts the .dynbss
2281 section into the .bss section of the final image. */
2282 s = bfd_make_section_anyway_with_flags (abfd, ".dynbss",
2283 SEC_ALLOC | SEC_LINKER_CREATED);
2284 htab->sdynbss = s;
2285 if (s == NULL)
2286 return false;
2287 /* The .rel[a].bss section holds copy relocs. This section is not
2288 normally needed. We need to create it here, though, so that the
2289 linker will map it to an output section. We can't just create it
2290 only if we need it, because we will not know whether we need it
2291 until we have seen all the input files, and the first time the
2292 main linker code calls BFD after examining all the input files
2293 (size_dynamic_sections) the input sections have already been
2294 mapped to the output sections. If the section turns out not to
2295 be needed, we can discard it later. We will never need this
2296 section when generating a shared object, since they do not use
2297 copy relocs. */
2298 if (! bfd_link_pic (info))
2299 {
2300 s = bfd_make_section_anyway_with_flags (abfd,
2301 (bed->default_use_rela_p
2302 ? ".rela.bss" : ".rel.bss"),
2303 flags | SEC_READONLY);
2304 htab->srelbss = s;
2305 if (s == NULL
2306 || !bfd_set_section_alignment (s, ptralign))
2307 return false;
2308 }
2309 }
2310
2311 return true;
2312 }
2313
2314 static bool
lm32_elf_always_size_sections(bfd * output_bfd,struct bfd_link_info * info)2315 lm32_elf_always_size_sections (bfd *output_bfd, struct bfd_link_info *info)
2316 {
2317 if (!bfd_link_relocatable (info))
2318 {
2319 if (!bfd_elf_stack_segment_size (output_bfd, info,
2320 "__stacksize", DEFAULT_STACK_SIZE))
2321 return false;
2322
2323 asection *sec = bfd_get_section_by_name (output_bfd, ".stack");
2324 if (sec)
2325 sec->size = info->stacksize >= 0 ? info->stacksize : 0;
2326 }
2327
2328 return true;
2329 }
2330
2331 static bool
lm32_elf_fdpic_copy_private_bfd_data(bfd * ibfd,bfd * obfd)2332 lm32_elf_fdpic_copy_private_bfd_data (bfd *ibfd, bfd *obfd)
2333 {
2334 unsigned i;
2335
2336 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
2337 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
2338 return true;
2339
2340 if (! _bfd_elf_copy_private_bfd_data (ibfd, obfd))
2341 return false;
2342
2343 if (! elf_tdata (ibfd) || ! elf_tdata (ibfd)->phdr
2344 || ! elf_tdata (obfd) || ! elf_tdata (obfd)->phdr)
2345 return true;
2346
2347 /* Copy the stack size. */
2348 for (i = 0; i < elf_elfheader (ibfd)->e_phnum; i++)
2349 if (elf_tdata (ibfd)->phdr[i].p_type == PT_GNU_STACK)
2350 {
2351 Elf_Internal_Phdr *iphdr = &elf_tdata (ibfd)->phdr[i];
2352
2353 for (i = 0; i < elf_elfheader (obfd)->e_phnum; i++)
2354 if (elf_tdata (obfd)->phdr[i].p_type == PT_GNU_STACK)
2355 {
2356 memcpy (&elf_tdata (obfd)->phdr[i], iphdr, sizeof (*iphdr));
2357
2358 /* Rewrite the phdrs, since we're only called after they were first written. */
2359 if (bfd_seek (obfd, (bfd_signed_vma) get_elf_backend_data (obfd)
2360 ->s->sizeof_ehdr, SEEK_SET) != 0
2361 || get_elf_backend_data (obfd)->s->write_out_phdrs (obfd, elf_tdata (obfd)->phdr,
2362 elf_elfheader (obfd)->e_phnum) != 0)
2363 return false;
2364 break;
2365 }
2366
2367 break;
2368 }
2369
2370 return true;
2371 }
2372
2373
2374 #define ELF_ARCH bfd_arch_lm32
2375 #define ELF_TARGET_ID LM32_ELF_DATA
2376 #define ELF_MACHINE_CODE EM_LATTICEMICO32
2377 #define ELF_MAXPAGESIZE 0x1000
2378
2379 #define TARGET_BIG_SYM lm32_elf32_vec
2380 #define TARGET_BIG_NAME "elf32-lm32"
2381
2382 #define bfd_elf32_bfd_reloc_type_lookup lm32_reloc_type_lookup
2383 #define bfd_elf32_bfd_reloc_name_lookup lm32_reloc_name_lookup
2384 #define elf_info_to_howto lm32_info_to_howto_rela
2385 #define elf_info_to_howto_rel NULL
2386 #define elf_backend_rela_normal 1
2387 #define elf_backend_object_p lm32_elf_object_p
2388 #define elf_backend_final_write_processing lm32_elf_final_write_processing
2389 #define elf_backend_stack_align 8
2390 #define elf_backend_can_gc_sections 1
2391 #define elf_backend_can_refcount 1
2392 #define elf_backend_gc_mark_hook lm32_elf_gc_mark_hook
2393 #define elf_backend_plt_readonly 1
2394 #define elf_backend_want_got_plt 1
2395 #define elf_backend_want_plt_sym 0
2396 #define elf_backend_got_header_size 12
2397 #define elf_backend_dtrel_excludes_plt 1
2398 #define bfd_elf32_bfd_link_hash_table_create lm32_elf_link_hash_table_create
2399 #define elf_backend_check_relocs lm32_elf_check_relocs
2400 #define elf_backend_reloc_type_class lm32_elf_reloc_type_class
2401 #define elf_backend_size_dynamic_sections lm32_elf_size_dynamic_sections
2402 #define elf_backend_omit_section_dynsym _bfd_elf_omit_section_dynsym_all
2403 #define elf_backend_create_dynamic_sections lm32_elf_create_dynamic_sections
2404 #define elf_backend_finish_dynamic_sections lm32_elf_finish_dynamic_sections
2405 #define elf_backend_adjust_dynamic_symbol lm32_elf_adjust_dynamic_symbol
2406 #define elf_backend_finish_dynamic_symbol lm32_elf_finish_dynamic_symbol
2407 #define elf_backend_relocate_section lm32_elf_relocate_section
2408
2409 #include "elf32-target.h"
2410
2411 #undef ELF_MAXPAGESIZE
2412 #define ELF_MAXPAGESIZE 0x4000
2413
2414
2415 #undef TARGET_BIG_SYM
2416 #define TARGET_BIG_SYM lm32_elf32_fdpic_vec
2417 #undef TARGET_BIG_NAME
2418 #define TARGET_BIG_NAME "elf32-lm32fdpic"
2419 #undef elf32_bed
2420 #define elf32_bed elf32_lm32fdpic_bed
2421
2422 #undef elf_backend_always_size_sections
2423 #define elf_backend_always_size_sections lm32_elf_always_size_sections
2424 #undef bfd_elf32_bfd_copy_private_bfd_data
2425 #define bfd_elf32_bfd_copy_private_bfd_data lm32_elf_fdpic_copy_private_bfd_data
2426
2427 #include "elf32-target.h"
2428