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* linker.c (bfd_link_hash_traverse): Follow warning symbol link.
[deliverable/binutils-gdb.git] / bfd / elf32-xstormy16.c
1 /* Xstormy16-specific support for 32-bit ELF.
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2010, 2011
3 Free Software Foundation, Inc.
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/xstormy16.h"
27 #include "libiberty.h"
28
29 /* Handle the R_XSTORMY16_24 reloc, which has an odd bit arrangement. */
30
31 static bfd_reloc_status_type
32 xstormy16_elf_24_reloc (bfd *abfd,
33 arelent *reloc_entry,
34 asymbol *symbol,
35 void * data,
36 asection *input_section,
37 bfd *output_bfd,
38 char **error_message ATTRIBUTE_UNUSED)
39 {
40 bfd_vma relocation, x;
41
42 if (output_bfd != NULL)
43 {
44 reloc_entry->address += input_section->output_offset;
45 return bfd_reloc_ok;
46 }
47
48 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
49 return bfd_reloc_outofrange;
50
51 if (bfd_is_com_section (symbol->section))
52 relocation = 0;
53 else
54 relocation = symbol->value;
55
56 relocation += symbol->section->output_section->vma;
57 relocation += symbol->section->output_offset;
58 relocation += reloc_entry->addend;
59
60 x = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
61 x &= 0x0000ff00;
62 x |= relocation & 0xff;
63 x |= (relocation << 8) & 0xffff0000;
64 bfd_put_32 (abfd, x, (bfd_byte *) data + reloc_entry->address);
65
66 if (relocation & ~ (bfd_vma) 0xffffff)
67 return bfd_reloc_overflow;
68
69 return bfd_reloc_ok;
70 }
71
72 static reloc_howto_type xstormy16_elf_howto_table [] =
73 {
74 /* This reloc does nothing. */
75 HOWTO (R_XSTORMY16_NONE, /* type */
76 0, /* rightshift */
77 2, /* size (0 = byte, 1 = short, 2 = long) */
78 32, /* bitsize */
79 FALSE, /* pc_relative */
80 0, /* bitpos */
81 complain_overflow_bitfield, /* complain_on_overflow */
82 bfd_elf_generic_reloc, /* special_function */
83 "R_XSTORMY16_NONE", /* name */
84 FALSE, /* partial_inplace */
85 0, /* src_mask */
86 0, /* dst_mask */
87 FALSE), /* pcrel_offset */
88
89 /* A 32 bit absolute relocation. */
90 HOWTO (R_XSTORMY16_32, /* type */
91 0, /* rightshift */
92 2, /* size (0 = byte, 1 = short, 2 = long) */
93 32, /* bitsize */
94 FALSE, /* pc_relative */
95 0, /* bitpos */
96 complain_overflow_dont, /* complain_on_overflow */
97 bfd_elf_generic_reloc, /* special_function */
98 "R_XSTORMY16_32", /* name */
99 FALSE, /* partial_inplace */
100 0, /* src_mask */
101 0xffffffff, /* dst_mask */
102 FALSE), /* pcrel_offset */
103
104 /* A 16 bit absolute relocation. */
105 HOWTO (R_XSTORMY16_16, /* type */
106 0, /* rightshift */
107 1, /* size (0 = byte, 1 = short, 2 = long) */
108 16, /* bitsize */
109 FALSE, /* pc_relative */
110 0, /* bitpos */
111 complain_overflow_bitfield, /* complain_on_overflow */
112 bfd_elf_generic_reloc, /* special_function */
113 "R_XSTORMY16_16", /* name */
114 FALSE, /* partial_inplace */
115 0, /* src_mask */
116 0xffff, /* dst_mask */
117 FALSE), /* pcrel_offset */
118
119 /* An 8 bit absolute relocation. */
120 HOWTO (R_XSTORMY16_8, /* type */
121 0, /* rightshift */
122 0, /* size (0 = byte, 1 = short, 2 = long) */
123 8, /* bitsize */
124 FALSE, /* pc_relative */
125 0, /* bitpos */
126 complain_overflow_unsigned, /* complain_on_overflow */
127 bfd_elf_generic_reloc, /* special_function */
128 "R_XSTORMY16_8", /* name */
129 FALSE, /* partial_inplace */
130 0, /* src_mask */
131 0xff, /* dst_mask */
132 FALSE), /* pcrel_offset */
133
134 /* A 32 bit pc-relative relocation. */
135 HOWTO (R_XSTORMY16_PC32, /* type */
136 0, /* rightshift */
137 2, /* size (0 = byte, 1 = short, 2 = long) */
138 32, /* bitsize */
139 TRUE, /* pc_relative */
140 0, /* bitpos */
141 complain_overflow_dont, /* complain_on_overflow */
142 bfd_elf_generic_reloc, /* special_function */
143 "R_XSTORMY16_PC32", /* name */
144 FALSE, /* partial_inplace */
145 0, /* src_mask */
146 0xffffffff, /* dst_mask */
147 TRUE), /* pcrel_offset */
148
149 /* A 16 bit pc-relative relocation. */
150 HOWTO (R_XSTORMY16_PC16, /* type */
151 0, /* rightshift */
152 1, /* size (0 = byte, 1 = short, 2 = long) */
153 16, /* bitsize */
154 TRUE, /* pc_relative */
155 0, /* bitpos */
156 complain_overflow_signed, /* complain_on_overflow */
157 bfd_elf_generic_reloc, /* special_function */
158 "R_XSTORMY16_PC16", /* name */
159 FALSE, /* partial_inplace */
160 0, /* src_mask */
161 0xffffffff, /* dst_mask */
162 TRUE), /* pcrel_offset */
163
164 /* An 8 bit pc-relative relocation. */
165 HOWTO (R_XSTORMY16_PC8, /* type */
166 0, /* rightshift */
167 0, /* size (0 = byte, 1 = short, 2 = long) */
168 8, /* bitsize */
169 TRUE, /* pc_relative */
170 0, /* bitpos */
171 complain_overflow_signed, /* complain_on_overflow */
172 bfd_elf_generic_reloc, /* special_function */
173 "R_XSTORMY16_PC8", /* name */
174 FALSE, /* partial_inplace */
175 0, /* src_mask */
176 0xffffffff, /* dst_mask */
177 TRUE), /* pcrel_offset */
178
179 /* A 12-bit pc-relative relocation suitable for the branch instructions. */
180 HOWTO (R_XSTORMY16_REL_12, /* type */
181 1, /* rightshift */
182 1, /* size (0 = byte, 1 = short, 2 = long) */
183 11, /* bitsize */
184 TRUE, /* pc_relative */
185 1, /* bitpos */
186 complain_overflow_signed, /* complain_on_overflow */
187 bfd_elf_generic_reloc, /* special_function */
188 "R_XSTORMY16_REL_12", /* name */
189 FALSE, /* partial_inplace */
190 0, /* src_mask */
191 0x0ffe, /* dst_mask */
192 TRUE), /* pcrel_offset */
193
194 /* A 24-bit absolute relocation suitable for the jump instructions. */
195 HOWTO (R_XSTORMY16_24, /* type */
196 0, /* rightshift */
197 2, /* size (0 = byte, 1 = short, 2 = long) */
198 24, /* bitsize */
199 FALSE, /* pc_relative */
200 0, /* bitpos */
201 complain_overflow_unsigned, /* complain_on_overflow */
202 xstormy16_elf_24_reloc, /* special_function */
203 "R_XSTORMY16_24", /* name */
204 TRUE, /* partial_inplace */
205 0, /* src_mask */
206 0xffff00ff, /* dst_mask */
207 TRUE), /* pcrel_offset */
208
209 /* A 16 bit absolute relocation to a function pointer. */
210 HOWTO (R_XSTORMY16_FPTR16, /* type */
211 0, /* rightshift */
212 1, /* size (0 = byte, 1 = short, 2 = long) */
213 16, /* bitsize */
214 FALSE, /* pc_relative */
215 0, /* bitpos */
216 complain_overflow_bitfield, /* complain_on_overflow */
217 bfd_elf_generic_reloc, /* special_function */
218 "R_XSTORMY16_FPTR16", /* name */
219 FALSE, /* partial_inplace */
220 0, /* src_mask */
221 0xffffffff, /* dst_mask */
222 FALSE), /* pcrel_offset */
223
224 /* Low order 16 bit value of a high memory address. */
225 HOWTO (R_XSTORMY16_LO16, /* type */
226 0, /* rightshift */
227 1, /* size (0 = byte, 1 = short, 2 = long) */
228 16, /* bitsize */
229 FALSE, /* pc_relative */
230 0, /* bitpos */
231 complain_overflow_dont, /* complain_on_overflow */
232 bfd_elf_generic_reloc, /* special_function */
233 "R_XSTORMY16_LO16", /* name */
234 FALSE, /* partial_inplace */
235 0, /* src_mask */
236 0xffff, /* dst_mask */
237 FALSE), /* pcrel_offset */
238
239 /* High order 16 bit value of a high memory address. */
240 HOWTO (R_XSTORMY16_HI16, /* type */
241 16, /* rightshift */
242 1, /* size (0 = byte, 1 = short, 2 = long) */
243 16, /* bitsize */
244 FALSE, /* pc_relative */
245 0, /* bitpos */
246 complain_overflow_dont, /* complain_on_overflow */
247 bfd_elf_generic_reloc, /* special_function */
248 "R_XSTORMY16_HI16", /* name */
249 FALSE, /* partial_inplace */
250 0, /* src_mask */
251 0xffff, /* dst_mask */
252 FALSE), /* pcrel_offset */
253
254 /* A 12 bit absolute relocation. */
255 HOWTO (R_XSTORMY16_12, /* type */
256 0, /* rightshift */
257 1, /* size (0 = byte, 1 = short, 2 = long) */
258 12, /* bitsize */
259 FALSE, /* pc_relative */
260 0, /* bitpos */
261 complain_overflow_signed, /* complain_on_overflow */
262 bfd_elf_generic_reloc, /* special_function */
263 "R_XSTORMY16_12", /* name */
264 FALSE, /* partial_inplace */
265 0x0000, /* src_mask */
266 0x0fff, /* dst_mask */
267 FALSE), /* pcrel_offset */
268 };
269
270 static reloc_howto_type xstormy16_elf_howto_table2 [] =
271 {
272 /* GNU extension to record C++ vtable hierarchy */
273 HOWTO (R_XSTORMY16_GNU_VTINHERIT, /* type */
274 0, /* rightshift */
275 2, /* size (0 = byte, 1 = short, 2 = long) */
276 0, /* bitsize */
277 FALSE, /* pc_relative */
278 0, /* bitpos */
279 complain_overflow_dont, /* complain_on_overflow */
280 NULL, /* special_function */
281 "R_XSTORMY16_GNU_VTINHERIT", /* name */
282 FALSE, /* partial_inplace */
283 0, /* src_mask */
284 0, /* dst_mask */
285 FALSE), /* pcrel_offset */
286
287 /* GNU extension to record C++ vtable member usage */
288 HOWTO (R_XSTORMY16_GNU_VTENTRY, /* type */
289 0, /* rightshift */
290 2, /* size (0 = byte, 1 = short, 2 = long) */
291 0, /* bitsize */
292 FALSE, /* pc_relative */
293 0, /* bitpos */
294 complain_overflow_dont, /* complain_on_overflow */
295 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
296 "R_XSTORMY16_GNU_VTENTRY", /* name */
297 FALSE, /* partial_inplace */
298 0, /* src_mask */
299 0, /* dst_mask */
300 FALSE), /* pcrel_offset */
301
302 };
303 \f
304 /* Map BFD reloc types to XSTORMY16 ELF reloc types. */
305
306 typedef struct xstormy16_reloc_map
307 {
308 bfd_reloc_code_real_type bfd_reloc_val;
309 unsigned int xstormy16_reloc_val;
310 reloc_howto_type * table;
311 } reloc_map;
312
313 static const reloc_map xstormy16_reloc_map [] =
314 {
315 { BFD_RELOC_NONE, R_XSTORMY16_NONE, xstormy16_elf_howto_table },
316 { BFD_RELOC_32, R_XSTORMY16_32, xstormy16_elf_howto_table },
317 { BFD_RELOC_16, R_XSTORMY16_16, xstormy16_elf_howto_table },
318 { BFD_RELOC_8, R_XSTORMY16_8, xstormy16_elf_howto_table },
319 { BFD_RELOC_32_PCREL, R_XSTORMY16_PC32, xstormy16_elf_howto_table },
320 { BFD_RELOC_16_PCREL, R_XSTORMY16_PC16, xstormy16_elf_howto_table },
321 { BFD_RELOC_8_PCREL, R_XSTORMY16_PC8, xstormy16_elf_howto_table },
322 { BFD_RELOC_XSTORMY16_REL_12, R_XSTORMY16_REL_12, xstormy16_elf_howto_table },
323 { BFD_RELOC_XSTORMY16_24, R_XSTORMY16_24, xstormy16_elf_howto_table },
324 { BFD_RELOC_XSTORMY16_FPTR16, R_XSTORMY16_FPTR16, xstormy16_elf_howto_table },
325 { BFD_RELOC_LO16, R_XSTORMY16_LO16, xstormy16_elf_howto_table },
326 { BFD_RELOC_HI16, R_XSTORMY16_HI16, xstormy16_elf_howto_table },
327 { BFD_RELOC_XSTORMY16_12, R_XSTORMY16_12, xstormy16_elf_howto_table },
328 { BFD_RELOC_VTABLE_INHERIT, R_XSTORMY16_GNU_VTINHERIT, xstormy16_elf_howto_table2 },
329 { BFD_RELOC_VTABLE_ENTRY, R_XSTORMY16_GNU_VTENTRY, xstormy16_elf_howto_table2 },
330 };
331
332 static reloc_howto_type *
333 xstormy16_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED,
334 bfd_reloc_code_real_type code)
335 {
336 unsigned int i;
337
338 for (i = ARRAY_SIZE (xstormy16_reloc_map); --i;)
339 {
340 const reloc_map * entry;
341
342 entry = xstormy16_reloc_map + i;
343
344 if (entry->bfd_reloc_val == code)
345 return entry->table + (entry->xstormy16_reloc_val
346 - entry->table[0].type);
347 }
348
349 return NULL;
350 }
351
352 static reloc_howto_type *
353 xstormy16_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
354 const char *r_name)
355 {
356 unsigned int i;
357
358 for (i = 0;
359 i < (sizeof (xstormy16_elf_howto_table)
360 / sizeof (xstormy16_elf_howto_table[0]));
361 i++)
362 if (xstormy16_elf_howto_table[i].name != NULL
363 && strcasecmp (xstormy16_elf_howto_table[i].name, r_name) == 0)
364 return &xstormy16_elf_howto_table[i];
365
366 for (i = 0;
367 i < (sizeof (xstormy16_elf_howto_table2)
368 / sizeof (xstormy16_elf_howto_table2[0]));
369 i++)
370 if (xstormy16_elf_howto_table2[i].name != NULL
371 && strcasecmp (xstormy16_elf_howto_table2[i].name, r_name) == 0)
372 return &xstormy16_elf_howto_table2[i];
373
374 return NULL;
375 }
376
377 /* Set the howto pointer for an XSTORMY16 ELF reloc. */
378
379 static void
380 xstormy16_info_to_howto_rela (bfd * abfd ATTRIBUTE_UNUSED,
381 arelent * cache_ptr,
382 Elf_Internal_Rela * dst)
383 {
384 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
385
386 if (r_type <= (unsigned int) R_XSTORMY16_12)
387 cache_ptr->howto = &xstormy16_elf_howto_table [r_type];
388 else if (r_type - R_XSTORMY16_GNU_VTINHERIT
389 <= (unsigned int) R_XSTORMY16_GNU_VTENTRY)
390 cache_ptr->howto
391 = &xstormy16_elf_howto_table2 [r_type - R_XSTORMY16_GNU_VTINHERIT];
392 else
393 abort ();
394 }
395 \f
396 /* We support 16-bit pointers to code above 64k by generating a thunk
397 below 64k containing a JMPF instruction to the final address. We
398 cannot, unfortunately, minimize the number of thunks unless the
399 -relax switch is given, as otherwise we have no idea where the
400 sections will fall in the address space. */
401
402 static bfd_boolean
403 xstormy16_elf_check_relocs (bfd *abfd,
404 struct bfd_link_info *info,
405 asection *sec,
406 const Elf_Internal_Rela *relocs)
407 {
408 const Elf_Internal_Rela *rel, *relend;
409 struct elf_link_hash_entry **sym_hashes;
410 Elf_Internal_Shdr *symtab_hdr;
411 bfd_vma *local_plt_offsets;
412 asection *splt;
413 bfd *dynobj;
414
415 if (info->relocatable)
416 return TRUE;
417
418 symtab_hdr = &elf_tdata(abfd)->symtab_hdr;
419 sym_hashes = elf_sym_hashes (abfd);
420 local_plt_offsets = elf_local_got_offsets (abfd);
421 splt = NULL;
422 dynobj = elf_hash_table(info)->dynobj;
423
424 relend = relocs + sec->reloc_count;
425 for (rel = relocs; rel < relend; ++rel)
426 {
427 unsigned long r_symndx;
428 struct elf_link_hash_entry *h;
429 bfd_vma *offset;
430
431 r_symndx = ELF32_R_SYM (rel->r_info);
432 if (r_symndx < symtab_hdr->sh_info)
433 h = NULL;
434 else
435 {
436 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
437 while (h->root.type == bfd_link_hash_indirect
438 || h->root.type == bfd_link_hash_warning)
439 h = (struct elf_link_hash_entry *) h->root.u.i.link;
440 }
441
442 switch (ELF32_R_TYPE (rel->r_info))
443 {
444 /* This relocation describes a 16-bit pointer to a function.
445 We may need to allocate a thunk in low memory; reserve memory
446 for it now. */
447 case R_XSTORMY16_FPTR16:
448 if (rel->r_addend != 0)
449 {
450 (*info->callbacks->warning)
451 (info, _("non-zero addend in @fptr reloc"), 0,
452 abfd, 0, 0);
453 }
454
455 if (dynobj == NULL)
456 elf_hash_table (info)->dynobj = dynobj = abfd;
457 if (splt == NULL)
458 {
459 splt = bfd_get_section_by_name (dynobj, ".plt");
460 if (splt == NULL)
461 {
462 splt = bfd_make_section_with_flags (dynobj, ".plt",
463 (SEC_ALLOC
464 | SEC_LOAD
465 | SEC_HAS_CONTENTS
466 | SEC_IN_MEMORY
467 | SEC_LINKER_CREATED
468 | SEC_READONLY
469 | SEC_CODE));
470
471 if (splt == NULL
472 || ! bfd_set_section_alignment (dynobj, splt, 1))
473 return FALSE;
474 }
475 }
476
477 if (h != NULL)
478 offset = &h->plt.offset;
479 else
480 {
481 if (local_plt_offsets == NULL)
482 {
483 size_t size;
484 unsigned int i;
485
486 size = symtab_hdr->sh_info * sizeof (bfd_vma);
487 local_plt_offsets = bfd_alloc (abfd, size);
488 if (local_plt_offsets == NULL)
489 return FALSE;
490 elf_local_got_offsets (abfd) = local_plt_offsets;
491
492 for (i = 0; i < symtab_hdr->sh_info; i++)
493 local_plt_offsets[i] = (bfd_vma) -1;
494 }
495 offset = &local_plt_offsets[r_symndx];
496 }
497
498 if (*offset == (bfd_vma) -1)
499 {
500 *offset = splt->size;
501 splt->size += 4;
502 }
503 break;
504
505 /* This relocation describes the C++ object vtable hierarchy.
506 Reconstruct it for later use during GC. */
507 case R_XSTORMY16_GNU_VTINHERIT:
508 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
509 return FALSE;
510 break;
511
512 /* This relocation describes which C++ vtable entries are actually
513 used. Record for later use during GC. */
514 case R_XSTORMY16_GNU_VTENTRY:
515 BFD_ASSERT (h != NULL);
516 if (h != NULL
517 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
518 return FALSE;
519 break;
520 }
521 }
522
523 return TRUE;
524 }
525
526 /* A subroutine of xstormy16_elf_relax_section. If the global symbol H
527 is within the low 64k, remove any entry for it in the plt. */
528
529 struct relax_plt_data
530 {
531 asection *splt;
532 bfd_boolean *again;
533 };
534
535 static bfd_boolean
536 xstormy16_relax_plt_check (struct elf_link_hash_entry *h, void * xdata)
537 {
538 struct relax_plt_data *data = (struct relax_plt_data *) xdata;
539
540 if (h->plt.offset != (bfd_vma) -1)
541 {
542 bfd_vma address;
543
544 if (h->root.type == bfd_link_hash_undefined
545 || h->root.type == bfd_link_hash_undefweak)
546 address = 0;
547 else
548 address = (h->root.u.def.section->output_section->vma
549 + h->root.u.def.section->output_offset
550 + h->root.u.def.value);
551
552 if (address <= 0xffff)
553 {
554 h->plt.offset = -1;
555 data->splt->size -= 4;
556 *data->again = TRUE;
557 }
558 }
559
560 return TRUE;
561 }
562
563 /* A subroutine of xstormy16_elf_relax_section. If the global symbol H
564 previously had a plt entry, give it a new entry offset. */
565
566 static bfd_boolean
567 xstormy16_relax_plt_realloc (struct elf_link_hash_entry *h, void * xdata)
568 {
569 bfd_vma *entry = (bfd_vma *) xdata;
570
571 if (h->plt.offset != (bfd_vma) -1)
572 {
573 h->plt.offset = *entry;
574 *entry += 4;
575 }
576
577 return TRUE;
578 }
579
580 static bfd_boolean
581 xstormy16_elf_relax_section (bfd *dynobj,
582 asection *splt,
583 struct bfd_link_info *info,
584 bfd_boolean *again)
585 {
586 struct relax_plt_data relax_plt_data;
587 bfd *ibfd;
588
589 /* Assume nothing changes. */
590 *again = FALSE;
591
592 if (info->relocatable)
593 return TRUE;
594
595 /* We only relax the .plt section at the moment. */
596 if (dynobj != elf_hash_table (info)->dynobj
597 || strcmp (splt->name, ".plt") != 0)
598 return TRUE;
599
600 /* Quick check for an empty plt. */
601 if (splt->size == 0)
602 return TRUE;
603
604 /* Map across all global symbols; see which ones happen to
605 fall in the low 64k. */
606 relax_plt_data.splt = splt;
607 relax_plt_data.again = again;
608 elf_link_hash_traverse (elf_hash_table (info), xstormy16_relax_plt_check,
609 &relax_plt_data);
610
611 /* Likewise for local symbols, though that's somewhat less convenient
612 as we have to walk the list of input bfds and swap in symbol data. */
613 for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link_next)
614 {
615 bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd);
616 Elf_Internal_Shdr *symtab_hdr;
617 Elf_Internal_Sym *isymbuf = NULL;
618 unsigned int idx;
619
620 if (! local_plt_offsets)
621 continue;
622
623 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
624 if (symtab_hdr->sh_info != 0)
625 {
626 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
627 if (isymbuf == NULL)
628 isymbuf = bfd_elf_get_elf_syms (ibfd, symtab_hdr,
629 symtab_hdr->sh_info, 0,
630 NULL, NULL, NULL);
631 if (isymbuf == NULL)
632 return FALSE;
633 }
634
635 for (idx = 0; idx < symtab_hdr->sh_info; ++idx)
636 {
637 Elf_Internal_Sym *isym;
638 asection *tsec;
639 bfd_vma address;
640
641 if (local_plt_offsets[idx] == (bfd_vma) -1)
642 continue;
643
644 isym = &isymbuf[idx];
645 if (isym->st_shndx == SHN_UNDEF)
646 continue;
647 else if (isym->st_shndx == SHN_ABS)
648 tsec = bfd_abs_section_ptr;
649 else if (isym->st_shndx == SHN_COMMON)
650 tsec = bfd_com_section_ptr;
651 else
652 tsec = bfd_section_from_elf_index (ibfd, isym->st_shndx);
653
654 address = (tsec->output_section->vma
655 + tsec->output_offset
656 + isym->st_value);
657 if (address <= 0xffff)
658 {
659 local_plt_offsets[idx] = -1;
660 splt->size -= 4;
661 *again = TRUE;
662 }
663 }
664
665 if (isymbuf != NULL
666 && symtab_hdr->contents != (unsigned char *) isymbuf)
667 {
668 if (! info->keep_memory)
669 free (isymbuf);
670 else
671 {
672 /* Cache the symbols for elf_link_input_bfd. */
673 symtab_hdr->contents = (unsigned char *) isymbuf;
674 }
675 }
676 }
677
678 /* If we changed anything, walk the symbols again to reallocate
679 .plt entry addresses. */
680 if (*again && splt->size > 0)
681 {
682 bfd_vma entry = 0;
683
684 elf_link_hash_traverse (elf_hash_table (info),
685 xstormy16_relax_plt_realloc, &entry);
686
687 for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link_next)
688 {
689 bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd);
690 unsigned int nlocals = elf_tdata (ibfd)->symtab_hdr.sh_info;
691 unsigned int idx;
692
693 if (! local_plt_offsets)
694 continue;
695
696 for (idx = 0; idx < nlocals; ++idx)
697 if (local_plt_offsets[idx] != (bfd_vma) -1)
698 {
699 local_plt_offsets[idx] = entry;
700 entry += 4;
701 }
702 }
703 }
704
705 return TRUE;
706 }
707
708 static bfd_boolean
709 xstormy16_elf_always_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
710 struct bfd_link_info *info)
711 {
712 bfd *dynobj;
713 asection *splt;
714
715 if (info->relocatable)
716 return TRUE;
717
718 dynobj = elf_hash_table (info)->dynobj;
719 if (dynobj == NULL)
720 return TRUE;
721
722 splt = bfd_get_section_by_name (dynobj, ".plt");
723 BFD_ASSERT (splt != NULL);
724
725 splt->contents = bfd_zalloc (dynobj, splt->size);
726 if (splt->contents == NULL)
727 return FALSE;
728
729 return TRUE;
730 }
731 \f
732 /* Relocate an XSTORMY16 ELF section.
733
734 The RELOCATE_SECTION function is called by the new ELF backend linker
735 to handle the relocations for a section.
736
737 The relocs are always passed as Rela structures; if the section
738 actually uses Rel structures, the r_addend field will always be
739 zero.
740
741 This function is responsible for adjusting the section contents as
742 necessary, and (if using Rela relocs and generating a relocatable
743 output file) adjusting the reloc addend as necessary.
744
745 This function does not have to worry about setting the reloc
746 address or the reloc symbol index.
747
748 LOCAL_SYMS is a pointer to the swapped in local symbols.
749
750 LOCAL_SECTIONS is an array giving the section in the input file
751 corresponding to the st_shndx field of each local symbol.
752
753 The global hash table entry for the global symbols can be found
754 via elf_sym_hashes (input_bfd).
755
756 When generating relocatable output, this function must handle
757 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
758 going to be the section symbol corresponding to the output
759 section, which means that the addend must be adjusted
760 accordingly. */
761
762 static bfd_boolean
763 xstormy16_elf_relocate_section (bfd * output_bfd ATTRIBUTE_UNUSED,
764 struct bfd_link_info * info,
765 bfd * input_bfd,
766 asection * input_section,
767 bfd_byte * contents,
768 Elf_Internal_Rela * relocs,
769 Elf_Internal_Sym * local_syms,
770 asection ** local_sections)
771 {
772 Elf_Internal_Shdr * symtab_hdr;
773 struct elf_link_hash_entry ** sym_hashes;
774 Elf_Internal_Rela * rel;
775 Elf_Internal_Rela * relend;
776 bfd *dynobj;
777 asection *splt;
778
779 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
780 sym_hashes = elf_sym_hashes (input_bfd);
781 relend = relocs + input_section->reloc_count;
782
783 dynobj = elf_hash_table (info)->dynobj;
784 splt = NULL;
785 if (dynobj != NULL)
786 splt = bfd_get_section_by_name (dynobj, ".plt");
787
788 for (rel = relocs; rel < relend; rel ++)
789 {
790 reloc_howto_type * howto;
791 unsigned long r_symndx;
792 Elf_Internal_Sym * sym;
793 asection * sec;
794 struct elf_link_hash_entry * h;
795 bfd_vma relocation;
796 bfd_reloc_status_type r;
797 const char * name = NULL;
798 int r_type;
799
800 r_type = ELF32_R_TYPE (rel->r_info);
801
802 if ( r_type == R_XSTORMY16_GNU_VTINHERIT
803 || r_type == R_XSTORMY16_GNU_VTENTRY)
804 continue;
805
806 r_symndx = ELF32_R_SYM (rel->r_info);
807 howto = xstormy16_elf_howto_table + ELF32_R_TYPE (rel->r_info);
808 h = NULL;
809 sym = NULL;
810 sec = NULL;
811
812 if (r_symndx < symtab_hdr->sh_info)
813 {
814 sym = local_syms + r_symndx;
815 sec = local_sections [r_symndx];
816 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
817 }
818 else
819 {
820 bfd_boolean unresolved_reloc, warned;
821
822 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
823 r_symndx, symtab_hdr, sym_hashes,
824 h, sec, relocation,
825 unresolved_reloc, warned);
826 }
827
828 if (sec != NULL && elf_discarded_section (sec))
829 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
830 rel, relend, howto, contents);
831
832 if (info->relocatable)
833 continue;
834
835 if (h != NULL)
836 name = h->root.root.string;
837 else
838 {
839 name = (bfd_elf_string_from_elf_section
840 (input_bfd, symtab_hdr->sh_link, sym->st_name));
841 if (name == NULL || *name == '\0')
842 name = bfd_section_name (input_bfd, sec);
843 }
844
845 switch (ELF32_R_TYPE (rel->r_info))
846 {
847 case R_XSTORMY16_24:
848 {
849 bfd_vma reloc = relocation + rel->r_addend;
850 unsigned int x;
851
852 x = bfd_get_32 (input_bfd, contents + rel->r_offset);
853 x &= 0x0000ff00;
854 x |= reloc & 0xff;
855 x |= (reloc << 8) & 0xffff0000;
856 bfd_put_32 (input_bfd, x, contents + rel->r_offset);
857
858 if (reloc & ~0xffffff)
859 r = bfd_reloc_overflow;
860 else
861 r = bfd_reloc_ok;
862 break;
863 }
864
865 case R_XSTORMY16_FPTR16:
866 {
867 bfd_vma *plt_offset;
868
869 if (h != NULL)
870 plt_offset = &h->plt.offset;
871 else
872 plt_offset = elf_local_got_offsets (input_bfd) + r_symndx;
873
874 if (relocation <= 0xffff)
875 {
876 /* If the symbol is in range for a 16-bit address, we should
877 have deallocated the plt entry in relax_section. */
878 BFD_ASSERT (*plt_offset == (bfd_vma) -1);
879 }
880 else
881 {
882 /* If the symbol is out of range for a 16-bit address,
883 we must have allocated a plt entry. */
884 BFD_ASSERT (*plt_offset != (bfd_vma) -1);
885
886 /* If this is the first time we've processed this symbol,
887 fill in the plt entry with the correct symbol address. */
888 if ((*plt_offset & 1) == 0)
889 {
890 unsigned int x;
891
892 x = 0x00000200; /* jmpf */
893 x |= relocation & 0xff;
894 x |= (relocation << 8) & 0xffff0000;
895 bfd_put_32 (input_bfd, x, splt->contents + *plt_offset);
896 *plt_offset |= 1;
897 }
898
899 relocation = (splt->output_section->vma
900 + splt->output_offset
901 + (*plt_offset & -2));
902 }
903 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
904 contents, rel->r_offset,
905 relocation, 0);
906 break;
907 }
908
909 default:
910 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
911 contents, rel->r_offset,
912 relocation, rel->r_addend);
913 break;
914 }
915
916 if (r != bfd_reloc_ok)
917 {
918 const char * msg = NULL;
919
920 switch (r)
921 {
922 case bfd_reloc_overflow:
923 r = info->callbacks->reloc_overflow
924 (info, (h ? &h->root : NULL), name, howto->name,
925 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
926 break;
927
928 case bfd_reloc_undefined:
929 r = info->callbacks->undefined_symbol
930 (info, name, input_bfd, input_section, rel->r_offset,
931 TRUE);
932 break;
933
934 case bfd_reloc_outofrange:
935 msg = _("internal error: out of range error");
936 break;
937
938 case bfd_reloc_notsupported:
939 msg = _("internal error: unsupported relocation error");
940 break;
941
942 case bfd_reloc_dangerous:
943 msg = _("internal error: dangerous relocation");
944 break;
945
946 default:
947 msg = _("internal error: unknown error");
948 break;
949 }
950
951 if (msg)
952 r = info->callbacks->warning
953 (info, msg, name, input_bfd, input_section, rel->r_offset);
954
955 if (! r)
956 return FALSE;
957 }
958 }
959
960 return TRUE;
961 }
962
963 /* This must exist if dynobj is ever set. */
964
965 static bfd_boolean
966 xstormy16_elf_finish_dynamic_sections (bfd *abfd ATTRIBUTE_UNUSED,
967 struct bfd_link_info *info)
968 {
969 bfd *dynobj;
970 asection *splt;
971
972 /* As an extra sanity check, verify that all plt entries have
973 been filled in. */
974
975 if ((dynobj = elf_hash_table (info)->dynobj) != NULL
976 && (splt = bfd_get_section_by_name (dynobj, ".plt")) != NULL)
977 {
978 bfd_byte *contents = splt->contents;
979 unsigned int i, size = splt->size;
980
981 for (i = 0; i < size; i += 4)
982 {
983 unsigned int x = bfd_get_32 (dynobj, contents + i);
984
985 BFD_ASSERT (x != 0);
986 }
987 }
988
989 return TRUE;
990 }
991 \f
992 /* Return the section that should be marked against GC for a given
993 relocation. */
994
995 static asection *
996 xstormy16_elf_gc_mark_hook (asection *sec,
997 struct bfd_link_info *info,
998 Elf_Internal_Rela *rel,
999 struct elf_link_hash_entry *h,
1000 Elf_Internal_Sym *sym)
1001 {
1002 if (h != NULL)
1003 switch (ELF32_R_TYPE (rel->r_info))
1004 {
1005 case R_XSTORMY16_GNU_VTINHERIT:
1006 case R_XSTORMY16_GNU_VTENTRY:
1007 return NULL;
1008 }
1009
1010 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1011 }
1012 \f
1013 #define ELF_ARCH bfd_arch_xstormy16
1014 #define ELF_MACHINE_CODE EM_XSTORMY16
1015 #define ELF_MAXPAGESIZE 0x100
1016
1017 #define TARGET_LITTLE_SYM bfd_elf32_xstormy16_vec
1018 #define TARGET_LITTLE_NAME "elf32-xstormy16"
1019
1020 #define elf_info_to_howto_rel NULL
1021 #define elf_info_to_howto xstormy16_info_to_howto_rela
1022 #define elf_backend_relocate_section xstormy16_elf_relocate_section
1023 #define elf_backend_gc_mark_hook xstormy16_elf_gc_mark_hook
1024 #define elf_backend_check_relocs xstormy16_elf_check_relocs
1025 #define elf_backend_always_size_sections \
1026 xstormy16_elf_always_size_sections
1027 #define elf_backend_omit_section_dynsym \
1028 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
1029 #define elf_backend_finish_dynamic_sections \
1030 xstormy16_elf_finish_dynamic_sections
1031
1032 #define elf_backend_can_gc_sections 1
1033 #define elf_backend_rela_normal 1
1034
1035 #define bfd_elf32_bfd_reloc_type_lookup xstormy16_reloc_type_lookup
1036 #define bfd_elf32_bfd_reloc_name_lookup \
1037 xstormy16_reloc_name_lookup
1038 #define bfd_elf32_bfd_relax_section xstormy16_elf_relax_section
1039
1040 #include "elf32-target.h"
GDB Binutils - Deliverables
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