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[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
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 /* Set the howto pointer for an XSTORMY16 ELF reloc. */
353
354 static void
355 xstormy16_info_to_howto_rela (bfd * abfd ATTRIBUTE_UNUSED,
356 arelent * cache_ptr,
357 Elf_Internal_Rela * dst)
358 {
359 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
360
361 if (r_type <= (unsigned int) R_XSTORMY16_12)
362 cache_ptr->howto = &xstormy16_elf_howto_table [r_type];
363 else if (r_type - R_XSTORMY16_GNU_VTINHERIT
364 <= (unsigned int) R_XSTORMY16_GNU_VTENTRY)
365 cache_ptr->howto
366 = &xstormy16_elf_howto_table2 [r_type - R_XSTORMY16_GNU_VTINHERIT];
367 else
368 abort ();
369 }
370 \f
371 /* We support 16-bit pointers to code above 64k by generating a thunk
372 below 64k containing a JMPF instruction to the final address. We
373 cannot, unfortunately, minimize the number of thunks unless the
374 -relax switch is given, as otherwise we have no idea where the
375 sections will fall in the address space. */
376
377 static bfd_boolean
378 xstormy16_elf_check_relocs (bfd *abfd,
379 struct bfd_link_info *info,
380 asection *sec,
381 const Elf_Internal_Rela *relocs)
382 {
383 const Elf_Internal_Rela *rel, *relend;
384 struct elf_link_hash_entry **sym_hashes;
385 Elf_Internal_Shdr *symtab_hdr;
386 bfd_vma *local_plt_offsets;
387 asection *splt;
388 bfd *dynobj;
389
390 if (info->relocatable)
391 return TRUE;
392
393 symtab_hdr = &elf_tdata(abfd)->symtab_hdr;
394 sym_hashes = elf_sym_hashes (abfd);
395 local_plt_offsets = elf_local_got_offsets (abfd);
396 splt = NULL;
397 dynobj = elf_hash_table(info)->dynobj;
398
399 relend = relocs + sec->reloc_count;
400 for (rel = relocs; rel < relend; ++rel)
401 {
402 unsigned long r_symndx;
403 struct elf_link_hash_entry *h;
404 bfd_vma *offset;
405
406 r_symndx = ELF32_R_SYM (rel->r_info);
407 if (r_symndx < symtab_hdr->sh_info)
408 h = NULL;
409 else
410 {
411 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
412 while (h->root.type == bfd_link_hash_indirect
413 || h->root.type == bfd_link_hash_warning)
414 h = (struct elf_link_hash_entry *) h->root.u.i.link;
415 }
416
417 switch (ELF32_R_TYPE (rel->r_info))
418 {
419 /* This relocation describes a 16-bit pointer to a function.
420 We may need to allocate a thunk in low memory; reserve memory
421 for it now. */
422 case R_XSTORMY16_FPTR16:
423 if (rel->r_addend != 0)
424 {
425 (*info->callbacks->warning)
426 (info, _("non-zero addend in @fptr reloc"), 0,
427 abfd, 0, 0);
428 }
429
430 if (dynobj == NULL)
431 elf_hash_table (info)->dynobj = dynobj = abfd;
432 if (splt == NULL)
433 {
434 splt = bfd_get_section_by_name (dynobj, ".plt");
435 if (splt == NULL)
436 {
437 splt = bfd_make_section_with_flags (dynobj, ".plt",
438 (SEC_ALLOC
439 | SEC_LOAD
440 | SEC_HAS_CONTENTS
441 | SEC_IN_MEMORY
442 | SEC_LINKER_CREATED
443 | SEC_READONLY
444 | SEC_CODE));
445
446 if (splt == NULL
447 || ! bfd_set_section_alignment (dynobj, splt, 1))
448 return FALSE;
449 }
450 }
451
452 if (h != NULL)
453 offset = &h->plt.offset;
454 else
455 {
456 if (local_plt_offsets == NULL)
457 {
458 size_t size;
459 unsigned int i;
460
461 size = symtab_hdr->sh_info * sizeof (bfd_vma);
462 local_plt_offsets = bfd_alloc (abfd, size);
463 if (local_plt_offsets == NULL)
464 return FALSE;
465 elf_local_got_offsets (abfd) = local_plt_offsets;
466
467 for (i = 0; i < symtab_hdr->sh_info; i++)
468 local_plt_offsets[i] = (bfd_vma) -1;
469 }
470 offset = &local_plt_offsets[r_symndx];
471 }
472
473 if (*offset == (bfd_vma) -1)
474 {
475 *offset = splt->size;
476 splt->size += 4;
477 }
478 break;
479
480 /* This relocation describes the C++ object vtable hierarchy.
481 Reconstruct it for later use during GC. */
482 case R_XSTORMY16_GNU_VTINHERIT:
483 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
484 return FALSE;
485 break;
486
487 /* This relocation describes which C++ vtable entries are actually
488 used. Record for later use during GC. */
489 case R_XSTORMY16_GNU_VTENTRY:
490 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
491 return FALSE;
492 break;
493 }
494 }
495
496 return TRUE;
497 }
498
499 /* A subroutine of xstormy16_elf_relax_section. If the global symbol H
500 is within the low 64k, remove any entry for it in the plt. */
501
502 struct relax_plt_data
503 {
504 asection *splt;
505 bfd_boolean *again;
506 };
507
508 static bfd_boolean
509 xstormy16_relax_plt_check (struct elf_link_hash_entry *h, void * xdata)
510 {
511 struct relax_plt_data *data = (struct relax_plt_data *) xdata;
512
513 if (h->root.type == bfd_link_hash_warning)
514 h = (struct elf_link_hash_entry *) h->root.u.i.link;
515
516 if (h->plt.offset != (bfd_vma) -1)
517 {
518 bfd_vma address;
519
520 if (h->root.type == bfd_link_hash_undefined
521 || h->root.type == bfd_link_hash_undefweak)
522 address = 0;
523 else
524 address = (h->root.u.def.section->output_section->vma
525 + h->root.u.def.section->output_offset
526 + h->root.u.def.value);
527
528 if (address <= 0xffff)
529 {
530 h->plt.offset = -1;
531 data->splt->size -= 4;
532 *data->again = TRUE;
533 }
534 }
535
536 return TRUE;
537 }
538
539 /* A subroutine of xstormy16_elf_relax_section. If the global symbol H
540 previously had a plt entry, give it a new entry offset. */
541
542 static bfd_boolean
543 xstormy16_relax_plt_realloc (struct elf_link_hash_entry *h, void * xdata)
544 {
545 bfd_vma *entry = (bfd_vma *) xdata;
546
547 if (h->root.type == bfd_link_hash_warning)
548 h = (struct elf_link_hash_entry *) h->root.u.i.link;
549
550 if (h->plt.offset != (bfd_vma) -1)
551 {
552 h->plt.offset = *entry;
553 *entry += 4;
554 }
555
556 return TRUE;
557 }
558
559 static bfd_boolean
560 xstormy16_elf_relax_section (bfd *dynobj,
561 asection *splt,
562 struct bfd_link_info *info,
563 bfd_boolean *again)
564 {
565 struct relax_plt_data relax_plt_data;
566 bfd *ibfd;
567
568 /* Assume nothing changes. */
569 *again = FALSE;
570
571 if (info->relocatable)
572 return TRUE;
573
574 /* We only relax the .plt section at the moment. */
575 if (dynobj != elf_hash_table (info)->dynobj
576 || strcmp (splt->name, ".plt") != 0)
577 return TRUE;
578
579 /* Quick check for an empty plt. */
580 if (splt->size == 0)
581 return TRUE;
582
583 /* Map across all global symbols; see which ones happen to
584 fall in the low 64k. */
585 relax_plt_data.splt = splt;
586 relax_plt_data.again = again;
587 elf_link_hash_traverse (elf_hash_table (info), xstormy16_relax_plt_check,
588 &relax_plt_data);
589
590 /* Likewise for local symbols, though that's somewhat less convenient
591 as we have to walk the list of input bfds and swap in symbol data. */
592 for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link_next)
593 {
594 bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd);
595 Elf_Internal_Shdr *symtab_hdr;
596 Elf_Internal_Sym *isymbuf = NULL;
597 unsigned int idx;
598
599 if (! local_plt_offsets)
600 continue;
601
602 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
603 if (symtab_hdr->sh_info != 0)
604 {
605 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
606 if (isymbuf == NULL)
607 isymbuf = bfd_elf_get_elf_syms (ibfd, symtab_hdr,
608 symtab_hdr->sh_info, 0,
609 NULL, NULL, NULL);
610 if (isymbuf == NULL)
611 return FALSE;
612 }
613
614 for (idx = 0; idx < symtab_hdr->sh_info; ++idx)
615 {
616 Elf_Internal_Sym *isym;
617 asection *tsec;
618 bfd_vma address;
619
620 if (local_plt_offsets[idx] == (bfd_vma) -1)
621 continue;
622
623 isym = &isymbuf[idx];
624 if (isym->st_shndx == SHN_UNDEF)
625 continue;
626 else if (isym->st_shndx == SHN_ABS)
627 tsec = bfd_abs_section_ptr;
628 else if (isym->st_shndx == SHN_COMMON)
629 tsec = bfd_com_section_ptr;
630 else
631 tsec = bfd_section_from_elf_index (ibfd, isym->st_shndx);
632
633 address = (tsec->output_section->vma
634 + tsec->output_offset
635 + isym->st_value);
636 if (address <= 0xffff)
637 {
638 local_plt_offsets[idx] = -1;
639 splt->size -= 4;
640 *again = TRUE;
641 }
642 }
643
644 if (isymbuf != NULL
645 && symtab_hdr->contents != (unsigned char *) isymbuf)
646 {
647 if (! info->keep_memory)
648 free (isymbuf);
649 else
650 {
651 /* Cache the symbols for elf_link_input_bfd. */
652 symtab_hdr->contents = (unsigned char *) isymbuf;
653 }
654 }
655 }
656
657 /* If we changed anything, walk the symbols again to reallocate
658 .plt entry addresses. */
659 if (*again && splt->size > 0)
660 {
661 bfd_vma entry = 0;
662
663 elf_link_hash_traverse (elf_hash_table (info),
664 xstormy16_relax_plt_realloc, &entry);
665
666 for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link_next)
667 {
668 bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd);
669 unsigned int nlocals = elf_tdata (ibfd)->symtab_hdr.sh_info;
670 unsigned int idx;
671
672 if (! local_plt_offsets)
673 continue;
674
675 for (idx = 0; idx < nlocals; ++idx)
676 if (local_plt_offsets[idx] != (bfd_vma) -1)
677 {
678 local_plt_offsets[idx] = entry;
679 entry += 4;
680 }
681 }
682 }
683
684 return TRUE;
685 }
686
687 static bfd_boolean
688 xstormy16_elf_always_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
689 struct bfd_link_info *info)
690 {
691 bfd *dynobj;
692 asection *splt;
693
694 if (info->relocatable)
695 return TRUE;
696
697 dynobj = elf_hash_table (info)->dynobj;
698 if (dynobj == NULL)
699 return TRUE;
700
701 splt = bfd_get_section_by_name (dynobj, ".plt");
702 BFD_ASSERT (splt != NULL);
703
704 splt->contents = bfd_zalloc (dynobj, splt->size);
705 if (splt->contents == NULL)
706 return FALSE;
707
708 return TRUE;
709 }
710 \f
711 /* Relocate an XSTORMY16 ELF section.
712
713 The RELOCATE_SECTION function is called by the new ELF backend linker
714 to handle the relocations for a section.
715
716 The relocs are always passed as Rela structures; if the section
717 actually uses Rel structures, the r_addend field will always be
718 zero.
719
720 This function is responsible for adjusting the section contents as
721 necessary, and (if using Rela relocs and generating a relocatable
722 output file) adjusting the reloc addend as necessary.
723
724 This function does not have to worry about setting the reloc
725 address or the reloc symbol index.
726
727 LOCAL_SYMS is a pointer to the swapped in local symbols.
728
729 LOCAL_SECTIONS is an array giving the section in the input file
730 corresponding to the st_shndx field of each local symbol.
731
732 The global hash table entry for the global symbols can be found
733 via elf_sym_hashes (input_bfd).
734
735 When generating relocatable output, this function must handle
736 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
737 going to be the section symbol corresponding to the output
738 section, which means that the addend must be adjusted
739 accordingly. */
740
741 static bfd_boolean
742 xstormy16_elf_relocate_section (bfd * output_bfd ATTRIBUTE_UNUSED,
743 struct bfd_link_info * info,
744 bfd * input_bfd,
745 asection * input_section,
746 bfd_byte * contents,
747 Elf_Internal_Rela * relocs,
748 Elf_Internal_Sym * local_syms,
749 asection ** local_sections)
750 {
751 Elf_Internal_Shdr * symtab_hdr;
752 struct elf_link_hash_entry ** sym_hashes;
753 Elf_Internal_Rela * rel;
754 Elf_Internal_Rela * relend;
755 bfd *dynobj;
756 asection *splt;
757
758 if (info->relocatable)
759 return TRUE;
760
761 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
762 sym_hashes = elf_sym_hashes (input_bfd);
763 relend = relocs + input_section->reloc_count;
764
765 dynobj = elf_hash_table (info)->dynobj;
766 splt = NULL;
767 if (dynobj != NULL)
768 splt = bfd_get_section_by_name (dynobj, ".plt");
769
770 for (rel = relocs; rel < relend; rel ++)
771 {
772 reloc_howto_type * howto;
773 unsigned long r_symndx;
774 Elf_Internal_Sym * sym;
775 asection * sec;
776 struct elf_link_hash_entry * h;
777 bfd_vma relocation;
778 bfd_reloc_status_type r;
779 const char * name = NULL;
780 int r_type;
781
782 r_type = ELF32_R_TYPE (rel->r_info);
783
784 if ( r_type == R_XSTORMY16_GNU_VTINHERIT
785 || r_type == R_XSTORMY16_GNU_VTENTRY)
786 continue;
787
788 r_symndx = ELF32_R_SYM (rel->r_info);
789 howto = xstormy16_elf_howto_table + ELF32_R_TYPE (rel->r_info);
790 h = NULL;
791 sym = NULL;
792 sec = NULL;
793
794 if (r_symndx < symtab_hdr->sh_info)
795 {
796 sym = local_syms + r_symndx;
797 sec = local_sections [r_symndx];
798 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
799 }
800 else
801 {
802 bfd_boolean unresolved_reloc, warned;
803
804 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
805 r_symndx, symtab_hdr, sym_hashes,
806 h, sec, relocation,
807 unresolved_reloc, warned);
808 }
809
810 if (h != NULL)
811 name = h->root.root.string;
812 else
813 {
814 name = (bfd_elf_string_from_elf_section
815 (input_bfd, symtab_hdr->sh_link, sym->st_name));
816 if (name == NULL || *name == '\0')
817 name = bfd_section_name (input_bfd, sec);
818 }
819
820 switch (ELF32_R_TYPE (rel->r_info))
821 {
822 case R_XSTORMY16_24:
823 {
824 bfd_vma reloc = relocation + rel->r_addend;
825 unsigned int x;
826
827 x = bfd_get_32 (input_bfd, contents + rel->r_offset);
828 x &= 0x0000ff00;
829 x |= reloc & 0xff;
830 x |= (reloc << 8) & 0xffff0000;
831 bfd_put_32 (input_bfd, x, contents + rel->r_offset);
832
833 if (reloc & ~0xffffff)
834 r = bfd_reloc_overflow;
835 else
836 r = bfd_reloc_ok;
837 break;
838 }
839
840 case R_XSTORMY16_FPTR16:
841 {
842 bfd_vma *plt_offset;
843
844 if (h != NULL)
845 plt_offset = &h->plt.offset;
846 else
847 plt_offset = elf_local_got_offsets (input_bfd) + r_symndx;
848
849 if (relocation <= 0xffff)
850 {
851 /* If the symbol is in range for a 16-bit address, we should
852 have deallocated the plt entry in relax_section. */
853 BFD_ASSERT (*plt_offset == (bfd_vma) -1);
854 }
855 else
856 {
857 /* If the symbol is out of range for a 16-bit address,
858 we must have allocated a plt entry. */
859 BFD_ASSERT (*plt_offset != (bfd_vma) -1);
860
861 /* If this is the first time we've processed this symbol,
862 fill in the plt entry with the correct symbol address. */
863 if ((*plt_offset & 1) == 0)
864 {
865 unsigned int x;
866
867 x = 0x00000200; /* jmpf */
868 x |= relocation & 0xff;
869 x |= (relocation << 8) & 0xffff0000;
870 bfd_put_32 (input_bfd, x, splt->contents + *plt_offset);
871 *plt_offset |= 1;
872 }
873
874 relocation = (splt->output_section->vma
875 + splt->output_offset
876 + (*plt_offset & -2));
877 }
878 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
879 contents, rel->r_offset,
880 relocation, 0);
881 break;
882 }
883
884 default:
885 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
886 contents, rel->r_offset,
887 relocation, rel->r_addend);
888 break;
889 }
890
891 if (r != bfd_reloc_ok)
892 {
893 const char * msg = NULL;
894
895 switch (r)
896 {
897 case bfd_reloc_overflow:
898 r = info->callbacks->reloc_overflow
899 (info, (h ? &h->root : NULL), name, howto->name,
900 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
901 break;
902
903 case bfd_reloc_undefined:
904 r = info->callbacks->undefined_symbol
905 (info, name, input_bfd, input_section, rel->r_offset,
906 TRUE);
907 break;
908
909 case bfd_reloc_outofrange:
910 msg = _("internal error: out of range error");
911 break;
912
913 case bfd_reloc_notsupported:
914 msg = _("internal error: unsupported relocation error");
915 break;
916
917 case bfd_reloc_dangerous:
918 msg = _("internal error: dangerous relocation");
919 break;
920
921 default:
922 msg = _("internal error: unknown error");
923 break;
924 }
925
926 if (msg)
927 r = info->callbacks->warning
928 (info, msg, name, input_bfd, input_section, rel->r_offset);
929
930 if (! r)
931 return FALSE;
932 }
933 }
934
935 return TRUE;
936 }
937
938 /* This must exist if dynobj is ever set. */
939
940 static bfd_boolean
941 xstormy16_elf_finish_dynamic_sections (bfd *abfd ATTRIBUTE_UNUSED,
942 struct bfd_link_info *info)
943 {
944 bfd *dynobj;
945 asection *splt;
946
947 /* As an extra sanity check, verify that all plt entries have
948 been filled in. */
949
950 if ((dynobj = elf_hash_table (info)->dynobj) != NULL
951 && (splt = bfd_get_section_by_name (dynobj, ".plt")) != NULL)
952 {
953 bfd_byte *contents = splt->contents;
954 unsigned int i, size = splt->size;
955
956 for (i = 0; i < size; i += 4)
957 {
958 unsigned int x = bfd_get_32 (dynobj, contents + i);
959
960 BFD_ASSERT (x != 0);
961 }
962 }
963
964 return TRUE;
965 }
966 \f
967 /* Return the section that should be marked against GC for a given
968 relocation. */
969
970 static asection *
971 xstormy16_elf_gc_mark_hook (asection *sec,
972 struct bfd_link_info *info,
973 Elf_Internal_Rela *rel,
974 struct elf_link_hash_entry *h,
975 Elf_Internal_Sym *sym)
976 {
977 if (h != NULL)
978 switch (ELF32_R_TYPE (rel->r_info))
979 {
980 case R_XSTORMY16_GNU_VTINHERIT:
981 case R_XSTORMY16_GNU_VTENTRY:
982 return NULL;
983 }
984
985 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
986 }
987 \f
988 #define ELF_ARCH bfd_arch_xstormy16
989 #define ELF_MACHINE_CODE EM_XSTORMY16
990 #define ELF_MAXPAGESIZE 0x100
991
992 #define TARGET_LITTLE_SYM bfd_elf32_xstormy16_vec
993 #define TARGET_LITTLE_NAME "elf32-xstormy16"
994
995 #define elf_info_to_howto_rel NULL
996 #define elf_info_to_howto xstormy16_info_to_howto_rela
997 #define elf_backend_relocate_section xstormy16_elf_relocate_section
998 #define elf_backend_gc_mark_hook xstormy16_elf_gc_mark_hook
999 #define elf_backend_check_relocs xstormy16_elf_check_relocs
1000 #define elf_backend_always_size_sections \
1001 xstormy16_elf_always_size_sections
1002 #define elf_backend_omit_section_dynsym \
1003 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
1004 #define elf_backend_finish_dynamic_sections \
1005 xstormy16_elf_finish_dynamic_sections
1006
1007 #define elf_backend_can_gc_sections 1
1008 #define elf_backend_rela_normal 1
1009
1010 #define bfd_elf32_bfd_reloc_type_lookup xstormy16_reloc_type_lookup
1011 #define bfd_elf32_bfd_relax_section xstormy16_elf_relax_section
1012
1013 #include "elf32-target.h"
GDB Binutils - Deliverables
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