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* elflink.h (elf_gc_mark): Pass in the section whose relocs we are
[deliverable/binutils-gdb.git] / bfd / elf32-xstormy16.c
1 /* XSTORMY16-specific support for 32-bit ELF.
2 Copyright (C) 2000, 2001, 2002 Free Software Foundation, Inc.
3
4 This file is part of BFD, the Binary File Descriptor library.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
19
20 #include "bfd.h"
21 #include "sysdep.h"
22 #include "libbfd.h"
23 #include "elf-bfd.h"
24 #include "elf/xstormy16.h"
25 #include "libiberty.h"
26
27 /* Forward declarations. */
28 static reloc_howto_type * xstormy16_reloc_type_lookup
29 PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
30 static void xstormy16_info_to_howto_rela
31 PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
32 static bfd_reloc_status_type xstormy16_elf_24_reloc
33 PARAMS ((bfd *abfd, arelent *reloc_entry, asymbol *symbol,
34 PTR data, asection *input_section, bfd *output_bfd,
35 char **error_message));
36 static boolean xstormy16_elf_check_relocs
37 PARAMS ((bfd *, struct bfd_link_info *, asection *,
38 const Elf_Internal_Rela *));
39 static boolean xstormy16_relax_plt_check
40 PARAMS ((struct elf_link_hash_entry *, PTR));
41 static boolean xstormy16_relax_plt_realloc
42 PARAMS ((struct elf_link_hash_entry *, PTR));
43 static boolean xstormy16_elf_relax_section
44 PARAMS ((bfd *abfd, asection *sec, struct bfd_link_info *link_info,
45 boolean *again));
46 static boolean xstormy16_elf_always_size_sections
47 PARAMS ((bfd *, struct bfd_link_info *));
48 static boolean xstormy16_elf_relocate_section
49 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
50 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
51 static boolean xstormy16_elf_finish_dynamic_sections
52 PARAMS((bfd *, struct bfd_link_info *));
53 static boolean xstormy16_elf_gc_sweep_hook
54 PARAMS ((bfd *, struct bfd_link_info *, asection *,
55 const Elf_Internal_Rela *));
56 static asection * xstormy16_elf_gc_mark_hook
57 PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
58 struct elf_link_hash_entry *, Elf_Internal_Sym *));
59
60 static reloc_howto_type xstormy16_elf_howto_table [] =
61 {
62 /* This reloc does nothing. */
63 HOWTO (R_XSTORMY16_NONE, /* type */
64 0, /* rightshift */
65 2, /* size (0 = byte, 1 = short, 2 = long) */
66 32, /* bitsize */
67 false, /* pc_relative */
68 0, /* bitpos */
69 complain_overflow_bitfield, /* complain_on_overflow */
70 bfd_elf_generic_reloc, /* special_function */
71 "R_XSTORMY16_NONE", /* name */
72 false, /* partial_inplace */
73 0, /* src_mask */
74 0, /* dst_mask */
75 false), /* pcrel_offset */
76
77 /* A 32 bit absolute relocation. */
78 HOWTO (R_XSTORMY16_32, /* type */
79 0, /* rightshift */
80 2, /* size (0 = byte, 1 = short, 2 = long) */
81 32, /* bitsize */
82 false, /* pc_relative */
83 0, /* bitpos */
84 complain_overflow_dont, /* complain_on_overflow */
85 bfd_elf_generic_reloc, /* special_function */
86 "R_XSTORMY16_32", /* name */
87 false, /* partial_inplace */
88 0, /* src_mask */
89 0xffffffff, /* dst_mask */
90 false), /* pcrel_offset */
91
92 /* A 16 bit absolute relocation. */
93 HOWTO (R_XSTORMY16_16, /* type */
94 0, /* rightshift */
95 1, /* size (0 = byte, 1 = short, 2 = long) */
96 16, /* bitsize */
97 false, /* pc_relative */
98 0, /* bitpos */
99 complain_overflow_bitfield, /* complain_on_overflow */
100 bfd_elf_generic_reloc, /* special_function */
101 "R_XSTORMY16_16", /* name */
102 false, /* partial_inplace */
103 0, /* src_mask */
104 0xffffffff, /* dst_mask */
105 false), /* pcrel_offset */
106
107 /* An 8 bit absolute relocation. */
108 HOWTO (R_XSTORMY16_8, /* type */
109 0, /* rightshift */
110 0, /* size (0 = byte, 1 = short, 2 = long) */
111 8, /* bitsize */
112 false, /* pc_relative */
113 0, /* bitpos */
114 complain_overflow_bitfield, /* complain_on_overflow */
115 bfd_elf_generic_reloc, /* special_function */
116 "R_XSTORMY16_8", /* name */
117 false, /* partial_inplace */
118 0, /* src_mask */
119 0xffffffff, /* dst_mask */
120 false), /* pcrel_offset */
121
122 /* A 32 bit pc-relative relocation. */
123 HOWTO (R_XSTORMY16_PC32, /* type */
124 0, /* rightshift */
125 2, /* size (0 = byte, 1 = short, 2 = long) */
126 32, /* bitsize */
127 true, /* pc_relative */
128 0, /* bitpos */
129 complain_overflow_dont, /* complain_on_overflow */
130 bfd_elf_generic_reloc, /* special_function */
131 "R_XSTORMY16_PC32", /* name */
132 false, /* partial_inplace */
133 0, /* src_mask */
134 0xffffffff, /* dst_mask */
135 true), /* pcrel_offset */
136
137 /* A 16 bit pc-relative relocation. */
138 HOWTO (R_XSTORMY16_PC16, /* type */
139 0, /* rightshift */
140 1, /* size (0 = byte, 1 = short, 2 = long) */
141 16, /* bitsize */
142 true, /* pc_relative */
143 0, /* bitpos */
144 complain_overflow_signed, /* complain_on_overflow */
145 bfd_elf_generic_reloc, /* special_function */
146 "R_XSTORMY16_PC16", /* name */
147 false, /* partial_inplace */
148 0, /* src_mask */
149 0xffffffff, /* dst_mask */
150 true), /* pcrel_offset */
151
152 /* An 8 bit pc-relative relocation. */
153 HOWTO (R_XSTORMY16_PC8, /* type */
154 0, /* rightshift */
155 0, /* size (0 = byte, 1 = short, 2 = long) */
156 8, /* bitsize */
157 true, /* pc_relative */
158 0, /* bitpos */
159 complain_overflow_signed, /* complain_on_overflow */
160 bfd_elf_generic_reloc, /* special_function */
161 "R_XSTORMY16_PC8", /* name */
162 false, /* partial_inplace */
163 0, /* src_mask */
164 0xffffffff, /* dst_mask */
165 true), /* pcrel_offset */
166
167 /* A 12-bit pc-relative relocation suitable for the branch instructions. */
168 HOWTO (R_XSTORMY16_REL_12, /* type */
169 1, /* rightshift */
170 1, /* size (0 = byte, 1 = short, 2 = long) */
171 11, /* bitsize */
172 true, /* pc_relative */
173 1, /* bitpos */
174 complain_overflow_signed, /* complain_on_overflow */
175 bfd_elf_generic_reloc, /* special_function */
176 "R_XSTORMY16_REL_12", /* name */
177 true, /* partial_inplace */
178 0, /* src_mask */
179 0x0fff, /* dst_mask */
180 true), /* pcrel_offset */
181
182 /* A 24-bit absolute relocation suitable for the jump instructions. */
183 HOWTO (R_XSTORMY16_24, /* type */
184 0, /* rightshift */
185 2, /* size (0 = byte, 1 = short, 2 = long) */
186 24, /* bitsize */
187 false, /* pc_relative */
188 0, /* bitpos */
189 complain_overflow_unsigned, /* complain_on_overflow */
190 xstormy16_elf_24_reloc, /* special_function */
191 "R_XSTORMY16_24", /* name */
192 true, /* partial_inplace */
193 0, /* src_mask */
194 0xffff00ff, /* dst_mask */
195 true), /* pcrel_offset */
196
197 /* A 16 bit absolute relocation to a function pointer. */
198 HOWTO (R_XSTORMY16_FPTR16, /* type */
199 0, /* rightshift */
200 1, /* size (0 = byte, 1 = short, 2 = long) */
201 16, /* bitsize */
202 false, /* pc_relative */
203 0, /* bitpos */
204 complain_overflow_bitfield, /* complain_on_overflow */
205 bfd_elf_generic_reloc, /* special_function */
206 "R_XSTORMY16_FPTR16", /* name */
207 false, /* partial_inplace */
208 0, /* src_mask */
209 0xffffffff, /* dst_mask */
210 false), /* pcrel_offset */
211 };
212
213 static reloc_howto_type xstormy16_elf_howto_table2 [] =
214 {
215 /* GNU extension to record C++ vtable hierarchy */
216 HOWTO (R_XSTORMY16_GNU_VTINHERIT, /* type */
217 0, /* rightshift */
218 2, /* size (0 = byte, 1 = short, 2 = long) */
219 0, /* bitsize */
220 false, /* pc_relative */
221 0, /* bitpos */
222 complain_overflow_dont, /* complain_on_overflow */
223 NULL, /* special_function */
224 "R_XSTORMY16_GNU_VTINHERIT", /* name */
225 false, /* partial_inplace */
226 0, /* src_mask */
227 0, /* dst_mask */
228 false), /* pcrel_offset */
229
230 /* GNU extension to record C++ vtable member usage */
231 HOWTO (R_XSTORMY16_GNU_VTENTRY, /* type */
232 0, /* rightshift */
233 2, /* size (0 = byte, 1 = short, 2 = long) */
234 0, /* bitsize */
235 false, /* pc_relative */
236 0, /* bitpos */
237 complain_overflow_dont, /* complain_on_overflow */
238 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
239 "R_XSTORMY16_GNU_VTENTRY", /* name */
240 false, /* partial_inplace */
241 0, /* src_mask */
242 0, /* dst_mask */
243 false), /* pcrel_offset */
244
245 };
246 \f
247 /* Map BFD reloc types to XSTORMY16 ELF reloc types. */
248
249 typedef struct xstormy16_reloc_map
250 {
251 bfd_reloc_code_real_type bfd_reloc_val;
252 unsigned int xstormy16_reloc_val;
253 reloc_howto_type * table;
254 } reloc_map;
255
256 static const reloc_map xstormy16_reloc_map [] =
257 {
258 { BFD_RELOC_NONE, R_XSTORMY16_NONE, xstormy16_elf_howto_table },
259 { BFD_RELOC_32, R_XSTORMY16_32, xstormy16_elf_howto_table },
260 { BFD_RELOC_16, R_XSTORMY16_16, xstormy16_elf_howto_table },
261 { BFD_RELOC_8, R_XSTORMY16_8, xstormy16_elf_howto_table },
262 { BFD_RELOC_32_PCREL, R_XSTORMY16_PC32, xstormy16_elf_howto_table },
263 { BFD_RELOC_16_PCREL, R_XSTORMY16_PC16, xstormy16_elf_howto_table },
264 { BFD_RELOC_8_PCREL, R_XSTORMY16_PC8, xstormy16_elf_howto_table },
265 { BFD_RELOC_XSTORMY16_REL_12, R_XSTORMY16_REL_12, xstormy16_elf_howto_table },
266 { BFD_RELOC_XSTORMY16_24, R_XSTORMY16_24, xstormy16_elf_howto_table },
267 { BFD_RELOC_XSTORMY16_FPTR16, R_XSTORMY16_FPTR16, xstormy16_elf_howto_table },
268 { BFD_RELOC_VTABLE_INHERIT, R_XSTORMY16_GNU_VTINHERIT, xstormy16_elf_howto_table2 },
269 { BFD_RELOC_VTABLE_ENTRY, R_XSTORMY16_GNU_VTENTRY, xstormy16_elf_howto_table2 },
270 };
271
272 static reloc_howto_type *
273 xstormy16_reloc_type_lookup (abfd, code)
274 bfd * abfd ATTRIBUTE_UNUSED;
275 bfd_reloc_code_real_type code;
276 {
277 unsigned int i;
278
279 for (i = ARRAY_SIZE (xstormy16_reloc_map); --i;)
280 {
281 const reloc_map * entry;
282
283 entry = xstormy16_reloc_map + i;
284
285 if (entry->bfd_reloc_val == code)
286 return entry->table + (entry->xstormy16_reloc_val
287 - entry->table[0].type);
288 }
289
290 return NULL;
291 }
292
293 /* Set the howto pointer for an XSTORMY16 ELF reloc. */
294
295 static void
296 xstormy16_info_to_howto_rela (abfd, cache_ptr, dst)
297 bfd * abfd ATTRIBUTE_UNUSED;
298 arelent * cache_ptr;
299 Elf32_Internal_Rela * dst;
300 {
301 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
302
303 if (r_type <= (unsigned int) R_XSTORMY16_FPTR16)
304 cache_ptr->howto = &xstormy16_elf_howto_table [r_type];
305 else if (r_type - R_XSTORMY16_GNU_VTINHERIT
306 <= (unsigned int) R_XSTORMY16_GNU_VTENTRY)
307 cache_ptr->howto
308 = &xstormy16_elf_howto_table2 [r_type - R_XSTORMY16_GNU_VTINHERIT];
309 else
310 abort ();
311 }
312
313 /* Handle the R_XSTORMY16_24 reloc, which has an odd bit arrangement. */
314
315 static bfd_reloc_status_type
316 xstormy16_elf_24_reloc (abfd, reloc_entry, symbol, data, input_section,
317 output_bfd, error_message)
318 bfd *abfd;
319 arelent *reloc_entry;
320 asymbol *symbol;
321 PTR data;
322 asection *input_section;
323 bfd *output_bfd;
324 char **error_message ATTRIBUTE_UNUSED;
325 {
326 bfd_vma relocation, x;
327
328 if (output_bfd != NULL)
329 {
330 reloc_entry->address += input_section->output_offset;
331 return bfd_reloc_ok;
332 }
333
334 if (reloc_entry->address > input_section->_cooked_size)
335 return bfd_reloc_outofrange;
336
337 if (bfd_is_com_section (symbol->section))
338 relocation = 0;
339 else
340 relocation = symbol->value;
341
342 relocation += symbol->section->output_section->vma;
343 relocation += symbol->section->output_offset;
344 relocation += reloc_entry->addend;
345
346 x = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
347 x &= 0x0000ff00;
348 x |= relocation & 0xff;
349 x |= (relocation << 8) & 0xffff0000;
350 bfd_put_32 (abfd, x, (bfd_byte *) data + reloc_entry->address);
351
352 if (relocation & ~ (bfd_vma) 0xffffff)
353 return bfd_reloc_overflow;
354
355 return bfd_reloc_ok;
356 }
357 \f
358 /* We support 16-bit pointers to code above 64k by generating a thunk
359 below 64k containing a JMPF instruction to the final address. We
360 cannot, unfortunately, minimize the number of thunks unless the
361 -relax switch is given, as otherwise we have no idea where the
362 sections will fall in the address space. */
363
364 static boolean
365 xstormy16_elf_check_relocs (abfd, info, sec, relocs)
366 bfd *abfd;
367 struct bfd_link_info *info;
368 asection *sec;
369 const Elf_Internal_Rela *relocs;
370 {
371 const Elf_Internal_Rela *rel, *relend;
372 struct elf_link_hash_entry **sym_hashes;
373 Elf_Internal_Shdr *symtab_hdr;
374 bfd_vma *local_plt_offsets;
375 asection *splt;
376 bfd *dynobj;
377
378 if (info->relocateable)
379 return true;
380
381 symtab_hdr = &elf_tdata(abfd)->symtab_hdr;
382 sym_hashes = elf_sym_hashes (abfd);
383 local_plt_offsets = elf_local_got_offsets (abfd);
384 splt = NULL;
385 dynobj = elf_hash_table(info)->dynobj;
386
387 relend = relocs + sec->reloc_count;
388 for (rel = relocs; rel < relend; ++rel)
389 {
390 unsigned long r_symndx;
391 struct elf_link_hash_entry *h;
392 bfd_vma *offset;
393
394 r_symndx = ELF32_R_SYM (rel->r_info);
395 if (r_symndx < symtab_hdr->sh_info)
396 h = NULL;
397 else
398 {
399 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
400 while (h->root.type == bfd_link_hash_indirect
401 || h->root.type == bfd_link_hash_warning)
402 h = (struct elf_link_hash_entry *) h->root.u.i.link;
403 }
404
405 switch (ELF32_R_TYPE (rel->r_info))
406 {
407 /* This relocation describes a 16-bit pointer to a function.
408 We may need to allocate a thunk in low memory; reserve memory
409 for it now. */
410 case R_XSTORMY16_FPTR16:
411 if (rel->r_addend != 0)
412 {
413 (*info->callbacks->warning)
414 (info, _("non-zero addend in @fptr reloc"), 0,
415 abfd, 0, 0);
416 }
417
418 if (dynobj == NULL)
419 elf_hash_table (info)->dynobj = dynobj = abfd;
420 if (splt == NULL)
421 {
422 splt = bfd_get_section_by_name (dynobj, ".plt");
423 if (splt == NULL)
424 {
425 splt = bfd_make_section (dynobj, ".plt");
426 if (splt == NULL
427 || ! bfd_set_section_flags (dynobj, splt,
428 (SEC_ALLOC
429 | SEC_LOAD
430 | SEC_HAS_CONTENTS
431 | SEC_IN_MEMORY
432 | SEC_LINKER_CREATED
433 | SEC_READONLY
434 | SEC_CODE))
435 || ! bfd_set_section_alignment (dynobj, splt, 1))
436 return false;
437 }
438 }
439
440 if (h != NULL)
441 offset = &h->plt.offset;
442 else
443 {
444 if (local_plt_offsets == NULL)
445 {
446 size_t size;
447 unsigned int i;
448
449 size = symtab_hdr->sh_info * sizeof (bfd_vma);
450 local_plt_offsets = (bfd_vma *) bfd_alloc (abfd, size);
451 if (local_plt_offsets == NULL)
452 return false;
453 elf_local_got_offsets (abfd) = local_plt_offsets;
454
455 for (i = 0; i < symtab_hdr->sh_info; i++)
456 local_plt_offsets[i] = (bfd_vma) -1;
457 }
458 offset = &local_plt_offsets[r_symndx];
459 }
460
461 if (*offset == (bfd_vma) -1)
462 {
463 *offset = splt->_raw_size;
464 splt->_raw_size += 4;
465 }
466 break;
467
468 /* This relocation describes the C++ object vtable hierarchy.
469 Reconstruct it for later use during GC. */
470 case R_XSTORMY16_GNU_VTINHERIT:
471 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
472 return false;
473 break;
474
475 /* This relocation describes which C++ vtable entries are actually
476 used. Record for later use during GC. */
477 case R_XSTORMY16_GNU_VTENTRY:
478 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
479 return false;
480 break;
481 }
482 }
483
484 return true;
485 }
486
487 /* A subroutine of xstormy16_elf_relax_section. If the global symbol H
488 is within the low 64k, remove any entry for it in the plt. */
489
490 struct relax_plt_data
491 {
492 asection *splt;
493 boolean *again;
494 };
495
496 static boolean
497 xstormy16_relax_plt_check (h, xdata)
498 struct elf_link_hash_entry *h;
499 PTR xdata;
500 {
501 struct relax_plt_data *data = (struct relax_plt_data *) xdata;
502
503 if (h->root.type == bfd_link_hash_warning)
504 h = (struct elf_link_hash_entry *) h->root.u.i.link;
505
506 if (h->plt.offset != (bfd_vma) -1)
507 {
508 bfd_vma address;
509
510 if (h->root.type == bfd_link_hash_undefined
511 || h->root.type == bfd_link_hash_undefweak)
512 address = 0;
513 else
514 address = (h->root.u.def.section->output_section->vma
515 + h->root.u.def.section->output_offset
516 + h->root.u.def.value);
517
518 if (address <= 0xffff)
519 {
520 h->plt.offset = -1;
521 data->splt->_cooked_size -= 4;
522 *data->again = true;
523 }
524 }
525
526 return true;
527 }
528
529 /* A subroutine of xstormy16_elf_relax_section. If the global symbol H
530 previously had a plt entry, give it a new entry offset. */
531
532 static boolean
533 xstormy16_relax_plt_realloc (h, xdata)
534 struct elf_link_hash_entry *h;
535 PTR xdata;
536 {
537 bfd_vma *entry = (bfd_vma *) xdata;
538
539 if (h->root.type == bfd_link_hash_warning)
540 h = (struct elf_link_hash_entry *) h->root.u.i.link;
541
542 if (h->plt.offset != (bfd_vma) -1)
543 {
544 h->plt.offset = *entry;
545 *entry += 4;
546 }
547
548 return true;
549 }
550
551 static boolean
552 xstormy16_elf_relax_section (dynobj, splt, info, again)
553 bfd *dynobj;
554 asection *splt;
555 struct bfd_link_info *info;
556 boolean *again;
557 {
558 struct relax_plt_data relax_plt_data;
559 bfd *ibfd;
560
561 /* Assume nothing changes. */
562 *again = false;
563
564 if (info->relocateable)
565 return true;
566
567 /* We only relax the .plt section at the moment. */
568 if (dynobj != elf_hash_table (info)->dynobj
569 || strcmp (splt->name, ".plt") != 0)
570 return true;
571
572 /* Quick check for an empty plt. */
573 if (splt->_raw_size == 0)
574 return true;
575
576 /* If this is the first time we have been called for this section,
577 initialize the cooked size. */
578 if (splt->_cooked_size == 0)
579 splt->_cooked_size = splt->_raw_size;
580
581 /* Map across all global symbols; see which ones happen to
582 fall in the low 64k. */
583 relax_plt_data.splt = splt;
584 relax_plt_data.again = again;
585 elf_link_hash_traverse (elf_hash_table (info), xstormy16_relax_plt_check,
586 &relax_plt_data);
587
588 /* Likewise for local symbols, though that's somewhat less convenient
589 as we have walk the list of input bfds and swap in symbol data. */
590 for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link_next)
591 {
592 bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd);
593 Elf_Internal_Shdr *symtab_hdr;
594 Elf_Internal_Shdr *shndx_hdr;
595 Elf32_External_Sym *extsyms;
596 Elf_External_Sym_Shndx *shndx_buf;
597 unsigned int idx;
598
599 if (! local_plt_offsets)
600 continue;
601
602 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
603 shndx_hdr = &elf_tdata (ibfd)->symtab_shndx_hdr;
604
605 if (symtab_hdr->contents != NULL)
606 extsyms = (Elf32_External_Sym *) symtab_hdr->contents;
607 else
608 {
609 bfd_size_type amt;
610
611 amt = symtab_hdr->sh_info;
612 amt *= sizeof (Elf32_External_Sym);
613 extsyms = (Elf32_External_Sym *) bfd_malloc (amt);
614 if (extsyms == NULL)
615 return false;
616 if (bfd_seek (ibfd, symtab_hdr->sh_offset, SEEK_SET) != 0
617 || bfd_bread ((PTR) extsyms, amt, ibfd) != amt)
618 {
619 error_ret_free_extsyms:
620 free (extsyms);
621 return false;
622 }
623 }
624
625 shndx_buf = NULL;
626 if (shndx_hdr->sh_size != 0)
627 {
628 bfd_size_type amt;
629
630 amt = symtab_hdr->sh_info;
631 amt *= sizeof (Elf_External_Sym_Shndx);
632 shndx_buf = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
633 if (shndx_buf == NULL)
634 goto error_ret_free_extsyms;
635 if (bfd_seek (ibfd, shndx_hdr->sh_offset, SEEK_SET) != 0
636 || bfd_bread ((PTR) shndx_buf, amt, ibfd) != amt)
637 {
638 free (shndx_buf);
639 goto error_ret_free_extsyms;
640 }
641 shndx_hdr->contents = (bfd_byte *) shndx_buf;
642 }
643
644 for (idx = 0; idx < symtab_hdr->sh_info; ++idx)
645 {
646 Elf_External_Sym_Shndx *shndx;
647 Elf_Internal_Sym isym;
648 asection *tsec;
649 bfd_vma address;
650
651 if (local_plt_offsets[idx] == (bfd_vma) -1)
652 continue;
653
654 shndx = shndx_buf;
655 if (shndx != NULL)
656 shndx += idx;
657 bfd_elf32_swap_symbol_in (ibfd, (const PTR) (extsyms + idx),
658 (const PTR) shndx, &isym);
659 if (isym.st_shndx == SHN_UNDEF)
660 continue;
661 else if (isym.st_shndx == SHN_ABS)
662 tsec = bfd_abs_section_ptr;
663 else if (isym.st_shndx == SHN_COMMON)
664 tsec = bfd_com_section_ptr;
665 else
666 tsec = bfd_section_from_elf_index (ibfd, isym.st_shndx);
667
668 address = (tsec->output_section->vma
669 + tsec->output_offset
670 + isym.st_value);
671 if (address <= 0xffff)
672 {
673 local_plt_offsets[idx] = -1;
674 splt->_cooked_size -= 4;
675 *again = true;
676 }
677 }
678
679 if (shndx_buf != NULL)
680 free (shndx_buf);
681
682 if ((Elf32_External_Sym *) symtab_hdr->contents != extsyms)
683 free (extsyms);
684 }
685
686 /* If we changed anything, walk the symbols again to reallocate
687 .plt entry addresses. */
688 if (*again && splt->_cooked_size > 0)
689 {
690 bfd_vma entry = 0;
691
692 elf_link_hash_traverse (elf_hash_table (info),
693 xstormy16_relax_plt_realloc, &entry);
694
695 for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link_next)
696 {
697 bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd);
698 unsigned int nlocals = elf_tdata (ibfd)->symtab_hdr.sh_info;
699 unsigned int idx;
700
701 if (! local_plt_offsets)
702 continue;
703
704 for (idx = 0; idx < nlocals; ++idx)
705 if (local_plt_offsets[idx] != (bfd_vma) -1)
706 {
707 local_plt_offsets[idx] = entry;
708 entry += 4;
709 }
710 }
711 }
712
713 splt->_raw_size = splt->_cooked_size;
714 return true;
715 }
716
717 static boolean
718 xstormy16_elf_always_size_sections (output_bfd, info)
719 bfd *output_bfd ATTRIBUTE_UNUSED;
720 struct bfd_link_info *info;
721 {
722 bfd *dynobj;
723 asection *splt;
724
725 if (info->relocateable)
726 return true;
727
728 dynobj = elf_hash_table (info)->dynobj;
729 if (dynobj == NULL)
730 return true;
731
732 splt = bfd_get_section_by_name (dynobj, ".plt");
733 BFD_ASSERT (splt != NULL);
734
735 splt->contents = (bfd_byte *) bfd_zalloc (dynobj, splt->_raw_size);
736 if (splt->contents == NULL)
737 return false;
738
739 return true;
740 }
741 \f
742 /* Relocate an XSTORMY16 ELF section.
743 There is some attempt to make this function usable for many architectures,
744 both USE_REL and USE_RELA ['twould be nice if such a critter existed],
745 if only to serve as a learning tool.
746
747 The RELOCATE_SECTION function is called by the new ELF backend linker
748 to handle the relocations for a section.
749
750 The relocs are always passed as Rela structures; if the section
751 actually uses Rel structures, the r_addend field will always be
752 zero.
753
754 This function is responsible for adjusting the section contents as
755 necessary, and (if using Rela relocs and generating a relocateable
756 output file) adjusting the reloc addend as necessary.
757
758 This function does not have to worry about setting the reloc
759 address or the reloc symbol index.
760
761 LOCAL_SYMS is a pointer to the swapped in local symbols.
762
763 LOCAL_SECTIONS is an array giving the section in the input file
764 corresponding to the st_shndx field of each local symbol.
765
766 The global hash table entry for the global symbols can be found
767 via elf_sym_hashes (input_bfd).
768
769 When generating relocateable output, this function must handle
770 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
771 going to be the section symbol corresponding to the output
772 section, which means that the addend must be adjusted
773 accordingly. */
774
775 static boolean
776 xstormy16_elf_relocate_section (output_bfd, info, input_bfd, input_section,
777 contents, relocs, local_syms, local_sections)
778 bfd * output_bfd ATTRIBUTE_UNUSED;
779 struct bfd_link_info * info;
780 bfd * input_bfd;
781 asection * input_section;
782 bfd_byte * contents;
783 Elf_Internal_Rela * relocs;
784 Elf_Internal_Sym * local_syms;
785 asection ** local_sections;
786 {
787 Elf_Internal_Shdr * symtab_hdr;
788 struct elf_link_hash_entry ** sym_hashes;
789 Elf_Internal_Rela * rel;
790 Elf_Internal_Rela * relend;
791 bfd *dynobj;
792 asection *splt;
793
794 if (info->relocateable)
795 return true;
796
797 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
798 sym_hashes = elf_sym_hashes (input_bfd);
799 relend = relocs + input_section->reloc_count;
800
801 dynobj = elf_hash_table (info)->dynobj;
802 splt = NULL;
803 if (dynobj != NULL)
804 splt = bfd_get_section_by_name (dynobj, ".plt");
805
806 for (rel = relocs; rel < relend; rel ++)
807 {
808 reloc_howto_type * howto;
809 unsigned long r_symndx;
810 Elf_Internal_Sym * sym;
811 asection * sec;
812 struct elf_link_hash_entry * h;
813 bfd_vma relocation;
814 bfd_reloc_status_type r;
815 const char * name = NULL;
816 int r_type;
817
818 r_type = ELF32_R_TYPE (rel->r_info);
819
820 if ( r_type == R_XSTORMY16_GNU_VTINHERIT
821 || r_type == R_XSTORMY16_GNU_VTENTRY)
822 continue;
823
824 r_symndx = ELF32_R_SYM (rel->r_info);
825 howto = xstormy16_elf_howto_table + ELF32_R_TYPE (rel->r_info);
826 h = NULL;
827 sym = NULL;
828 sec = NULL;
829
830 if (r_symndx < symtab_hdr->sh_info)
831 {
832 sym = local_syms + r_symndx;
833 sec = local_sections [r_symndx];
834 relocation = (sec->output_section->vma
835 + sec->output_offset
836 + sym->st_value);
837
838 name = bfd_elf_string_from_elf_section
839 (input_bfd, symtab_hdr->sh_link, sym->st_name);
840 name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
841 }
842 else
843 {
844 h = sym_hashes [r_symndx - symtab_hdr->sh_info];
845
846 while (h->root.type == bfd_link_hash_indirect
847 || h->root.type == bfd_link_hash_warning)
848 h = (struct elf_link_hash_entry *) h->root.u.i.link;
849
850 name = h->root.root.string;
851
852 if (h->root.type == bfd_link_hash_defined
853 || h->root.type == bfd_link_hash_defweak)
854 {
855 sec = h->root.u.def.section;
856 relocation = (h->root.u.def.value
857 + sec->output_section->vma
858 + sec->output_offset);
859 }
860 else if (h->root.type == bfd_link_hash_undefweak)
861 {
862 relocation = 0;
863 }
864 else
865 {
866 if (! ((*info->callbacks->undefined_symbol)
867 (info, h->root.root.string, input_bfd,
868 input_section, rel->r_offset, true)))
869 return false;
870 relocation = 0;
871 }
872 }
873
874 switch (ELF32_R_TYPE (rel->r_info))
875 {
876 case R_XSTORMY16_24:
877 {
878 bfd_vma reloc = relocation + rel->r_addend;
879 unsigned int x;
880
881 x = bfd_get_32 (input_bfd, contents + rel->r_offset);
882 x &= 0x0000ff00;
883 x |= reloc & 0xff;
884 x |= (reloc << 8) & 0xffff0000;
885 bfd_put_32 (input_bfd, x, contents + rel->r_offset);
886
887 if (reloc & ~0xffffff)
888 r = bfd_reloc_overflow;
889 else
890 r = bfd_reloc_ok;
891 break;
892 }
893
894 case R_XSTORMY16_FPTR16:
895 {
896 bfd_vma *plt_offset;
897
898 if (h != NULL)
899 plt_offset = &h->plt.offset;
900 else
901 plt_offset = elf_local_got_offsets (input_bfd) + r_symndx;
902
903 if (relocation <= 0xffff)
904 {
905 /* If the symbol is in range for a 16-bit address, we should
906 have deallocated the plt entry in relax_section. */
907 BFD_ASSERT (*plt_offset == (bfd_vma) -1);
908 }
909 else
910 {
911 /* If the symbol is out of range for a 16-bit address,
912 we must have allocated a plt entry. */
913 BFD_ASSERT (*plt_offset != (bfd_vma) -1);
914
915 /* If this is the first time we've processed this symbol,
916 fill in the plt entry with the correct symbol address. */
917 if ((*plt_offset & 1) == 0)
918 {
919 unsigned int x;
920
921 x = 0x00000200; /* jmpf */
922 x |= relocation & 0xff;
923 x |= (relocation << 8) & 0xffff0000;
924 bfd_put_32 (input_bfd, x, splt->contents + *plt_offset);
925 *plt_offset |= 1;
926 }
927
928 relocation = (splt->output_section->vma
929 + splt->output_offset
930 + (*plt_offset & -2));
931 }
932 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
933 contents, rel->r_offset,
934 relocation, 0);
935 break;
936 }
937
938 default:
939 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
940 contents, rel->r_offset,
941 relocation, rel->r_addend);
942 break;
943 }
944
945 if (r != bfd_reloc_ok)
946 {
947 const char * msg = (const char *) NULL;
948
949 switch (r)
950 {
951 case bfd_reloc_overflow:
952 r = info->callbacks->reloc_overflow
953 (info, name, howto->name, (bfd_vma) 0,
954 input_bfd, input_section, rel->r_offset);
955 break;
956
957 case bfd_reloc_undefined:
958 r = info->callbacks->undefined_symbol
959 (info, name, input_bfd, input_section, rel->r_offset,
960 true);
961 break;
962
963 case bfd_reloc_outofrange:
964 msg = _("internal error: out of range error");
965 break;
966
967 case bfd_reloc_notsupported:
968 msg = _("internal error: unsupported relocation error");
969 break;
970
971 case bfd_reloc_dangerous:
972 msg = _("internal error: dangerous relocation");
973 break;
974
975 default:
976 msg = _("internal error: unknown error");
977 break;
978 }
979
980 if (msg)
981 r = info->callbacks->warning
982 (info, msg, name, input_bfd, input_section, rel->r_offset);
983
984 if (! r)
985 return false;
986 }
987 }
988
989 return true;
990 }
991
992 /* This must exist if dynobj is ever set. */
993
994 static boolean
995 xstormy16_elf_finish_dynamic_sections (abfd, info)
996 bfd *abfd ATTRIBUTE_UNUSED;
997 struct bfd_link_info *info;
998 {
999 bfd *dynobj;
1000 asection *splt;
1001
1002 /* As an extra sanity check, verify that all plt entries have
1003 been filled in. */
1004
1005 if ((dynobj = elf_hash_table (info)->dynobj) != NULL
1006 && (splt = bfd_get_section_by_name (dynobj, ".plt")) != NULL)
1007 {
1008 bfd_byte *contents = splt->contents;
1009 unsigned int i, size = splt->_raw_size;
1010 for (i = 0; i < size; i += 4)
1011 {
1012 unsigned int x = bfd_get_32 (dynobj, contents + i);
1013 BFD_ASSERT (x != 0);
1014 }
1015 }
1016
1017 return true;
1018 }
1019 \f
1020 /* Return the section that should be marked against GC for a given
1021 relocation. */
1022
1023 static asection *
1024 xstormy16_elf_gc_mark_hook (sec, info, rel, h, sym)
1025 asection * sec;
1026 struct bfd_link_info * info ATTRIBUTE_UNUSED;
1027 Elf_Internal_Rela * rel;
1028 struct elf_link_hash_entry * h;
1029 Elf_Internal_Sym * sym;
1030 {
1031 if (h != NULL)
1032 {
1033 switch (ELF32_R_TYPE (rel->r_info))
1034 {
1035 case R_XSTORMY16_GNU_VTINHERIT:
1036 case R_XSTORMY16_GNU_VTENTRY:
1037 break;
1038
1039 default:
1040 switch (h->root.type)
1041 {
1042 case bfd_link_hash_defined:
1043 case bfd_link_hash_defweak:
1044 return h->root.u.def.section;
1045
1046 case bfd_link_hash_common:
1047 return h->root.u.c.p->section;
1048
1049 default:
1050 break;
1051 }
1052 }
1053 }
1054 else
1055 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
1056
1057 return NULL;
1058 }
1059
1060 /* Update the got entry reference counts for the section being removed. */
1061
1062 static boolean
1063 xstormy16_elf_gc_sweep_hook (abfd, info, sec, relocs)
1064 bfd * abfd ATTRIBUTE_UNUSED;
1065 struct bfd_link_info * info ATTRIBUTE_UNUSED;
1066 asection * sec ATTRIBUTE_UNUSED;
1067 const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED;
1068 {
1069 return true;
1070 }
1071 \f
1072 #define ELF_ARCH bfd_arch_xstormy16
1073 #define ELF_MACHINE_CODE EM_XSTORMY16
1074 #define ELF_MAXPAGESIZE 0x100
1075
1076 #define TARGET_LITTLE_SYM bfd_elf32_xstormy16_vec
1077 #define TARGET_LITTLE_NAME "elf32-xstormy16"
1078
1079 #define elf_info_to_howto_rel NULL
1080 #define elf_info_to_howto xstormy16_info_to_howto_rela
1081 #define elf_backend_relocate_section xstormy16_elf_relocate_section
1082 #define elf_backend_gc_mark_hook xstormy16_elf_gc_mark_hook
1083 #define elf_backend_gc_sweep_hook xstormy16_elf_gc_sweep_hook
1084 #define elf_backend_check_relocs xstormy16_elf_check_relocs
1085 #define elf_backend_always_size_sections \
1086 xstormy16_elf_always_size_sections
1087 #define elf_backend_finish_dynamic_sections \
1088 xstormy16_elf_finish_dynamic_sections
1089
1090 #define elf_backend_can_gc_sections 1
1091 #define elf_backend_rela_normal 1
1092
1093 #define bfd_elf32_bfd_reloc_type_lookup xstormy16_reloc_type_lookup
1094 #define bfd_elf32_bfd_relax_section xstormy16_elf_relax_section
1095
1096 #include "elf32-target.h"
GDB Binutils - Deliverables
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