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ld/
[binutils.git] / bfd / elf32-xstormy16.c
blob07f8e1447a593c3698ed20698136f85e35ae1309
1 /* Xstormy16-specific support for 32-bit ELF.
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
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 2 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, MA 02110-1301,
20 USA. */
21
22 #include "bfd.h"
23 #include "sysdep.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 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
516 return FALSE;
517 break;
518 }
519 }
520
521 return TRUE;
522 }
523
524 /* A subroutine of xstormy16_elf_relax_section. If the global symbol H
525 is within the low 64k, remove any entry for it in the plt. */
526
527 struct relax_plt_data
528 {
529 asection *splt;
530 bfd_boolean *again;
531 };
532
533 static bfd_boolean
534 xstormy16_relax_plt_check (struct elf_link_hash_entry *h, void * xdata)
535 {
536 struct relax_plt_data *data = (struct relax_plt_data *) xdata;
537
538 if (h->root.type == bfd_link_hash_warning)
539 h = (struct elf_link_hash_entry *) h->root.u.i.link;
540
541 if (h->plt.offset != (bfd_vma) -1)
542 {
543 bfd_vma address;
544
545 if (h->root.type == bfd_link_hash_undefined
546 || h->root.type == bfd_link_hash_undefweak)
547 address = 0;
548 else
549 address = (h->root.u.def.section->output_section->vma
550 + h->root.u.def.section->output_offset
551 + h->root.u.def.value);
552
553 if (address <= 0xffff)
554 {
555 h->plt.offset = -1;
556 data->splt->size -= 4;
557 *data->again = TRUE;
558 }
559 }
560
561 return TRUE;
562 }
563
564 /* A subroutine of xstormy16_elf_relax_section. If the global symbol H
565 previously had a plt entry, give it a new entry offset. */
566
567 static bfd_boolean
568 xstormy16_relax_plt_realloc (struct elf_link_hash_entry *h, void * xdata)
569 {
570 bfd_vma *entry = (bfd_vma *) xdata;
571
572 if (h->root.type == bfd_link_hash_warning)
573 h = (struct elf_link_hash_entry *) h->root.u.i.link;
574
575 if (h->plt.offset != (bfd_vma) -1)
576 {
577 h->plt.offset = *entry;
578 *entry += 4;
579 }
580
581 return TRUE;
582 }
583
584 static bfd_boolean
585 xstormy16_elf_relax_section (bfd *dynobj,
586 asection *splt,
587 struct bfd_link_info *info,
588 bfd_boolean *again)
589 {
590 struct relax_plt_data relax_plt_data;
591 bfd *ibfd;
592
593 /* Assume nothing changes. */
594 *again = FALSE;
595
596 if (info->relocatable)
597 return TRUE;
598
599 /* We only relax the .plt section at the moment. */
600 if (dynobj != elf_hash_table (info)->dynobj
601 || strcmp (splt->name, ".plt") != 0)
602 return TRUE;
603
604 /* Quick check for an empty plt. */
605 if (splt->size == 0)
606 return TRUE;
607
608 /* Map across all global symbols; see which ones happen to
609 fall in the low 64k. */
610 relax_plt_data.splt = splt;
611 relax_plt_data.again = again;
612 elf_link_hash_traverse (elf_hash_table (info), xstormy16_relax_plt_check,
613 &relax_plt_data);
614
615 /* Likewise for local symbols, though that's somewhat less convenient
616 as we have to walk the list of input bfds and swap in symbol data. */
617 for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link_next)
618 {
619 bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd);
620 Elf_Internal_Shdr *symtab_hdr;
621 Elf_Internal_Sym *isymbuf = NULL;
622 unsigned int idx;
623
624 if (! local_plt_offsets)
625 continue;
626
627 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
628 if (symtab_hdr->sh_info != 0)
629 {
630 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
631 if (isymbuf == NULL)
632 isymbuf = bfd_elf_get_elf_syms (ibfd, symtab_hdr,
633 symtab_hdr->sh_info, 0,
634 NULL, NULL, NULL);
635 if (isymbuf == NULL)
636 return FALSE;
637 }
638
639 for (idx = 0; idx < symtab_hdr->sh_info; ++idx)
640 {
641 Elf_Internal_Sym *isym;
642 asection *tsec;
643 bfd_vma address;
644
645 if (local_plt_offsets[idx] == (bfd_vma) -1)
646 continue;
647
648 isym = &isymbuf[idx];
649 if (isym->st_shndx == SHN_UNDEF)
650 continue;
651 else if (isym->st_shndx == SHN_ABS)
652 tsec = bfd_abs_section_ptr;
653 else if (isym->st_shndx == SHN_COMMON)
654 tsec = bfd_com_section_ptr;
655 else
656 tsec = bfd_section_from_elf_index (ibfd, isym->st_shndx);
657
658 address = (tsec->output_section->vma
659 + tsec->output_offset
660 + isym->st_value);
661 if (address <= 0xffff)
662 {
663 local_plt_offsets[idx] = -1;
664 splt->size -= 4;
665 *again = TRUE;
666 }
667 }
668
669 if (isymbuf != NULL
670 && symtab_hdr->contents != (unsigned char *) isymbuf)
671 {
672 if (! info->keep_memory)
673 free (isymbuf);
674 else
675 {
676 /* Cache the symbols for elf_link_input_bfd. */
677 symtab_hdr->contents = (unsigned char *) isymbuf;
678 }
679 }
680 }
681
682 /* If we changed anything, walk the symbols again to reallocate
683 .plt entry addresses. */
684 if (*again && splt->size > 0)
685 {
686 bfd_vma entry = 0;
687
688 elf_link_hash_traverse (elf_hash_table (info),
689 xstormy16_relax_plt_realloc, &entry);
690
691 for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link_next)
692 {
693 bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd);
694 unsigned int nlocals = elf_tdata (ibfd)->symtab_hdr.sh_info;
695 unsigned int idx;
696
697 if (! local_plt_offsets)
698 continue;
699
700 for (idx = 0; idx < nlocals; ++idx)
701 if (local_plt_offsets[idx] != (bfd_vma) -1)
702 {
703 local_plt_offsets[idx] = entry;
704 entry += 4;
705 }
706 }
707 }
708
709 return TRUE;
710 }
711
712 static bfd_boolean
713 xstormy16_elf_always_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
714 struct bfd_link_info *info)
715 {
716 bfd *dynobj;
717 asection *splt;
718
719 if (info->relocatable)
720 return TRUE;
721
722 dynobj = elf_hash_table (info)->dynobj;
723 if (dynobj == NULL)
724 return TRUE;
725
726 splt = bfd_get_section_by_name (dynobj, ".plt");
727 BFD_ASSERT (splt != NULL);
728
729 splt->contents = bfd_zalloc (dynobj, splt->size);
730 if (splt->contents == NULL)
731 return FALSE;
732
733 return TRUE;
734 }
735 \f
736 /* Relocate an XSTORMY16 ELF section.
737
738 The RELOCATE_SECTION function is called by the new ELF backend linker
739 to handle the relocations for a section.
740
741 The relocs are always passed as Rela structures; if the section
742 actually uses Rel structures, the r_addend field will always be
743 zero.
744
745 This function is responsible for adjusting the section contents as
746 necessary, and (if using Rela relocs and generating a relocatable
747 output file) adjusting the reloc addend as necessary.
748
749 This function does not have to worry about setting the reloc
750 address or the reloc symbol index.
751
752 LOCAL_SYMS is a pointer to the swapped in local symbols.
753
754 LOCAL_SECTIONS is an array giving the section in the input file
755 corresponding to the st_shndx field of each local symbol.
756
757 The global hash table entry for the global symbols can be found
758 via elf_sym_hashes (input_bfd).
759
760 When generating relocatable output, this function must handle
761 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
762 going to be the section symbol corresponding to the output
763 section, which means that the addend must be adjusted
764 accordingly. */
765
766 static bfd_boolean
767 xstormy16_elf_relocate_section (bfd * output_bfd ATTRIBUTE_UNUSED,
768 struct bfd_link_info * info,
769 bfd * input_bfd,
770 asection * input_section,
771 bfd_byte * contents,
772 Elf_Internal_Rela * relocs,
773 Elf_Internal_Sym * local_syms,
774 asection ** local_sections)
775 {
776 Elf_Internal_Shdr * symtab_hdr;
777 struct elf_link_hash_entry ** sym_hashes;
778 Elf_Internal_Rela * rel;
779 Elf_Internal_Rela * relend;
780 bfd *dynobj;
781 asection *splt;
782
783 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
784 sym_hashes = elf_sym_hashes (input_bfd);
785 relend = relocs + input_section->reloc_count;
786
787 dynobj = elf_hash_table (info)->dynobj;
788 splt = NULL;
789 if (dynobj != NULL)
790 splt = bfd_get_section_by_name (dynobj, ".plt");
791
792 for (rel = relocs; rel < relend; rel ++)
793 {
794 reloc_howto_type * howto;
795 unsigned long r_symndx;
796 Elf_Internal_Sym * sym;
797 asection * sec;
798 struct elf_link_hash_entry * h;
799 bfd_vma relocation;
800 bfd_reloc_status_type r;
801 const char * name = NULL;
802 int r_type;
803
804 r_type = ELF32_R_TYPE (rel->r_info);
805
806 if ( r_type == R_XSTORMY16_GNU_VTINHERIT
807 || r_type == R_XSTORMY16_GNU_VTENTRY)
808 continue;
809
810 r_symndx = ELF32_R_SYM (rel->r_info);
811 howto = xstormy16_elf_howto_table + ELF32_R_TYPE (rel->r_info);
812 h = NULL;
813 sym = NULL;
814 sec = NULL;
815
816 if (r_symndx < symtab_hdr->sh_info)
817 {
818 sym = local_syms + r_symndx;
819 sec = local_sections [r_symndx];
820 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
821 }
822 else
823 {
824 bfd_boolean unresolved_reloc, warned;
825
826 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
827 r_symndx, symtab_hdr, sym_hashes,
828 h, sec, relocation,
829 unresolved_reloc, warned);
830 }
831
832 if (sec != NULL && elf_discarded_section (sec))
833 {
834 /* For relocs against symbols from removed linkonce sections,
835 or sections discarded by a linker script, we just want the
836 section contents zeroed. Avoid any special processing. */
837 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
838 rel->r_info = 0;
839 rel->r_addend = 0;
840 continue;
841 }
842
843 if (info->relocatable)
844 continue;
845
846 if (h != NULL)
847 name = h->root.root.string;
848 else
849 {
850 name = (bfd_elf_string_from_elf_section
851 (input_bfd, symtab_hdr->sh_link, sym->st_name));
852 if (name == NULL || *name == '\0')
853 name = bfd_section_name (input_bfd, sec);
854 }
855
856 switch (ELF32_R_TYPE (rel->r_info))
857 {
858 case R_XSTORMY16_24:
859 {
860 bfd_vma reloc = relocation + rel->r_addend;
861 unsigned int x;
862
863 x = bfd_get_32 (input_bfd, contents + rel->r_offset);
864 x &= 0x0000ff00;
865 x |= reloc & 0xff;
866 x |= (reloc << 8) & 0xffff0000;
867 bfd_put_32 (input_bfd, x, contents + rel->r_offset);
868
869 if (reloc & ~0xffffff)
870 r = bfd_reloc_overflow;
871 else
872 r = bfd_reloc_ok;
873 break;
874 }
875
876 case R_XSTORMY16_FPTR16:
877 {
878 bfd_vma *plt_offset;
879
880 if (h != NULL)
881 plt_offset = &h->plt.offset;
882 else
883 plt_offset = elf_local_got_offsets (input_bfd) + r_symndx;
884
885 if (relocation <= 0xffff)
886 {
887 /* If the symbol is in range for a 16-bit address, we should
888 have deallocated the plt entry in relax_section. */
889 BFD_ASSERT (*plt_offset == (bfd_vma) -1);
890 }
891 else
892 {
893 /* If the symbol is out of range for a 16-bit address,
894 we must have allocated a plt entry. */
895 BFD_ASSERT (*plt_offset != (bfd_vma) -1);
896
897 /* If this is the first time we've processed this symbol,
898 fill in the plt entry with the correct symbol address. */
899 if ((*plt_offset & 1) == 0)
900 {
901 unsigned int x;
902
903 x = 0x00000200; /* jmpf */
904 x |= relocation & 0xff;
905 x |= (relocation << 8) & 0xffff0000;
906 bfd_put_32 (input_bfd, x, splt->contents + *plt_offset);
907 *plt_offset |= 1;
908 }
909
910 relocation = (splt->output_section->vma
911 + splt->output_offset
912 + (*plt_offset & -2));
913 }
914 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
915 contents, rel->r_offset,
916 relocation, 0);
917 break;
918 }
919
920 default:
921 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
922 contents, rel->r_offset,
923 relocation, rel->r_addend);
924 break;
925 }
926
927 if (r != bfd_reloc_ok)
928 {
929 const char * msg = NULL;
930
931 switch (r)
932 {
933 case bfd_reloc_overflow:
934 r = info->callbacks->reloc_overflow
935 (info, (h ? &h->root : NULL), name, howto->name,
936 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
937 break;
938
939 case bfd_reloc_undefined:
940 r = info->callbacks->undefined_symbol
941 (info, name, input_bfd, input_section, rel->r_offset,
942 TRUE);
943 break;
944
945 case bfd_reloc_outofrange:
946 msg = _("internal error: out of range error");
947 break;
948
949 case bfd_reloc_notsupported:
950 msg = _("internal error: unsupported relocation error");
951 break;
952
953 case bfd_reloc_dangerous:
954 msg = _("internal error: dangerous relocation");
955 break;
956
957 default:
958 msg = _("internal error: unknown error");
959 break;
960 }
961
962 if (msg)
963 r = info->callbacks->warning
964 (info, msg, name, input_bfd, input_section, rel->r_offset);
965
966 if (! r)
967 return FALSE;
968 }
969 }
970
971 return TRUE;
972 }
973
974 /* This must exist if dynobj is ever set. */
975
976 static bfd_boolean
977 xstormy16_elf_finish_dynamic_sections (bfd *abfd ATTRIBUTE_UNUSED,
978 struct bfd_link_info *info)
979 {
980 bfd *dynobj;
981 asection *splt;
982
983 /* As an extra sanity check, verify that all plt entries have
984 been filled in. */
985
986 if ((dynobj = elf_hash_table (info)->dynobj) != NULL
987 && (splt = bfd_get_section_by_name (dynobj, ".plt")) != NULL)
988 {
989 bfd_byte *contents = splt->contents;
990 unsigned int i, size = splt->size;
991
992 for (i = 0; i < size; i += 4)
993 {
994 unsigned int x = bfd_get_32 (dynobj, contents + i);
995
996 BFD_ASSERT (x != 0);
997 }
998 }
999
1000 return TRUE;
1001 }
1002 \f
1003 /* Return the section that should be marked against GC for a given
1004 relocation. */
1005
1006 static asection *
1007 xstormy16_elf_gc_mark_hook (asection *sec,
1008 struct bfd_link_info *info,
1009 Elf_Internal_Rela *rel,
1010 struct elf_link_hash_entry *h,
1011 Elf_Internal_Sym *sym)
1012 {
1013 if (h != NULL)
1014 switch (ELF32_R_TYPE (rel->r_info))
1015 {
1016 case R_XSTORMY16_GNU_VTINHERIT:
1017 case R_XSTORMY16_GNU_VTENTRY:
1018 return NULL;
1019 }
1020
1021 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1022 }
1023 \f
1024 #define ELF_ARCH bfd_arch_xstormy16
1025 #define ELF_MACHINE_CODE EM_XSTORMY16
1026 #define ELF_MAXPAGESIZE 0x100
1027
1028 #define TARGET_LITTLE_SYM bfd_elf32_xstormy16_vec
1029 #define TARGET_LITTLE_NAME "elf32-xstormy16"
1030
1031 #define elf_info_to_howto_rel NULL
1032 #define elf_info_to_howto xstormy16_info_to_howto_rela
1033 #define elf_backend_relocate_section xstormy16_elf_relocate_section
1034 #define elf_backend_gc_mark_hook xstormy16_elf_gc_mark_hook
1035 #define elf_backend_check_relocs xstormy16_elf_check_relocs
1036 #define elf_backend_always_size_sections \
1037 xstormy16_elf_always_size_sections
1038 #define elf_backend_omit_section_dynsym \
1039 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
1040 #define elf_backend_finish_dynamic_sections \
1041 xstormy16_elf_finish_dynamic_sections
1042
1043 #define elf_backend_can_gc_sections 1
1044 #define elf_backend_rela_normal 1
1045
1046 #define bfd_elf32_bfd_reloc_type_lookup xstormy16_reloc_type_lookup
1047 #define bfd_elf32_bfd_reloc_name_lookup \
1048 xstormy16_reloc_name_lookup
1049 #define bfd_elf32_bfd_relax_section xstormy16_elf_relax_section
1050
1051 #include "elf32-target.h"
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