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