1 /* Xstormy16-specific support for 32-bit ELF.
2 Copyright (C) 2000-2024 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 3 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., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
20
21 #include "sysdep.h"
22 #include "bfd.h"
23 #include "libbfd.h"
24 #include "elf-bfd.h"
25 #include "elf/xstormy16.h"
26 #include "libiberty.h"
27
28 /* Handle the R_XSTORMY16_24 reloc, which has an odd bit arrangement. */
29
30 static bfd_reloc_status_type
xstormy16_elf_24_reloc(bfd * abfd,arelent * reloc_entry,asymbol * symbol,void * data,asection * input_section,bfd * output_bfd,char ** error_message ATTRIBUTE_UNUSED)31 xstormy16_elf_24_reloc (bfd *abfd,
32 arelent *reloc_entry,
33 asymbol *symbol,
34 void * data,
35 asection *input_section,
36 bfd *output_bfd,
37 char **error_message ATTRIBUTE_UNUSED)
38 {
39 bfd_vma relocation, x;
40
41 if (output_bfd != NULL)
42 {
43 reloc_entry->address += input_section->output_offset;
44 return bfd_reloc_ok;
45 }
46
47 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
48 return bfd_reloc_outofrange;
49
50 if (bfd_is_com_section (symbol->section))
51 relocation = 0;
52 else
53 relocation = symbol->value;
54
55 relocation += symbol->section->output_section->vma;
56 relocation += symbol->section->output_offset;
57 relocation += reloc_entry->addend;
58
59 x = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
60 x &= 0x0000ff00;
61 x |= relocation & 0xff;
62 x |= (relocation << 8) & 0xffff0000;
63 bfd_put_32 (abfd, x, (bfd_byte *) data + reloc_entry->address);
64
65 if (relocation & ~ (bfd_vma) 0xffffff)
66 return bfd_reloc_overflow;
67
68 return bfd_reloc_ok;
69 }
70
71 static reloc_howto_type xstormy16_elf_howto_table [] =
72 {
73 /* This reloc does nothing. */
74 HOWTO (R_XSTORMY16_NONE, /* type */
75 0, /* rightshift */
76 0, /* size */
77 0, /* bitsize */
78 false, /* pc_relative */
79 0, /* bitpos */
80 complain_overflow_dont, /* complain_on_overflow */
81 bfd_elf_generic_reloc, /* special_function */
82 "R_XSTORMY16_NONE", /* name */
83 false, /* partial_inplace */
84 0, /* src_mask */
85 0, /* dst_mask */
86 false), /* pcrel_offset */
87
88 /* A 32 bit absolute relocation. */
89 HOWTO (R_XSTORMY16_32, /* type */
90 0, /* rightshift */
91 4, /* size */
92 32, /* bitsize */
93 false, /* pc_relative */
94 0, /* bitpos */
95 complain_overflow_dont, /* complain_on_overflow */
96 bfd_elf_generic_reloc, /* special_function */
97 "R_XSTORMY16_32", /* name */
98 false, /* partial_inplace */
99 0, /* src_mask */
100 0xffffffff, /* dst_mask */
101 false), /* pcrel_offset */
102
103 /* A 16 bit absolute relocation. */
104 HOWTO (R_XSTORMY16_16, /* type */
105 0, /* rightshift */
106 2, /* size */
107 16, /* bitsize */
108 false, /* pc_relative */
109 0, /* bitpos */
110 complain_overflow_bitfield, /* complain_on_overflow */
111 bfd_elf_generic_reloc, /* special_function */
112 "R_XSTORMY16_16", /* name */
113 false, /* partial_inplace */
114 0, /* src_mask */
115 0xffff, /* dst_mask */
116 false), /* pcrel_offset */
117
118 /* An 8 bit absolute relocation. */
119 HOWTO (R_XSTORMY16_8, /* type */
120 0, /* rightshift */
121 1, /* size */
122 8, /* bitsize */
123 false, /* pc_relative */
124 0, /* bitpos */
125 complain_overflow_unsigned, /* complain_on_overflow */
126 bfd_elf_generic_reloc, /* special_function */
127 "R_XSTORMY16_8", /* name */
128 false, /* partial_inplace */
129 0, /* src_mask */
130 0xff, /* dst_mask */
131 false), /* pcrel_offset */
132
133 /* A 32 bit pc-relative relocation. */
134 HOWTO (R_XSTORMY16_PC32, /* type */
135 0, /* rightshift */
136 4, /* size */
137 32, /* bitsize */
138 true, /* pc_relative */
139 0, /* bitpos */
140 complain_overflow_dont, /* complain_on_overflow */
141 bfd_elf_generic_reloc, /* special_function */
142 "R_XSTORMY16_PC32", /* name */
143 false, /* partial_inplace */
144 0, /* src_mask */
145 0xffffffff, /* dst_mask */
146 true), /* pcrel_offset */
147
148 /* A 16 bit pc-relative relocation. */
149 HOWTO (R_XSTORMY16_PC16, /* type */
150 0, /* rightshift */
151 2, /* size */
152 16, /* bitsize */
153 true, /* pc_relative */
154 0, /* bitpos */
155 complain_overflow_signed, /* complain_on_overflow */
156 bfd_elf_generic_reloc, /* special_function */
157 "R_XSTORMY16_PC16", /* name */
158 false, /* partial_inplace */
159 0, /* src_mask */
160 0xffffffff, /* dst_mask */
161 true), /* pcrel_offset */
162
163 /* An 8 bit pc-relative relocation. */
164 HOWTO (R_XSTORMY16_PC8, /* type */
165 0, /* rightshift */
166 1, /* size */
167 8, /* bitsize */
168 true, /* pc_relative */
169 0, /* bitpos */
170 complain_overflow_signed, /* complain_on_overflow */
171 bfd_elf_generic_reloc, /* special_function */
172 "R_XSTORMY16_PC8", /* name */
173 false, /* partial_inplace */
174 0, /* src_mask */
175 0xffffffff, /* dst_mask */
176 true), /* pcrel_offset */
177
178 /* A 12-bit pc-relative relocation suitable for the branch instructions. */
179 HOWTO (R_XSTORMY16_REL_12, /* type */
180 1, /* rightshift */
181 2, /* size */
182 11, /* bitsize */
183 true, /* pc_relative */
184 1, /* bitpos */
185 complain_overflow_signed, /* complain_on_overflow */
186 bfd_elf_generic_reloc, /* special_function */
187 "R_XSTORMY16_REL_12", /* name */
188 false, /* partial_inplace */
189 0, /* src_mask */
190 0x0ffe, /* dst_mask */
191 true), /* pcrel_offset */
192
193 /* A 24-bit absolute relocation suitable for the jump instructions. */
194 HOWTO (R_XSTORMY16_24, /* type */
195 0, /* rightshift */
196 4, /* size */
197 24, /* bitsize */
198 false, /* pc_relative */
199 0, /* bitpos */
200 complain_overflow_unsigned, /* complain_on_overflow */
201 xstormy16_elf_24_reloc, /* special_function */
202 "R_XSTORMY16_24", /* name */
203 true, /* partial_inplace */
204 0, /* src_mask */
205 0xffff00ff, /* dst_mask */
206 true), /* pcrel_offset */
207
208 /* A 16 bit absolute relocation to a function pointer. */
209 HOWTO (R_XSTORMY16_FPTR16, /* type */
210 0, /* rightshift */
211 2, /* size */
212 16, /* bitsize */
213 false, /* pc_relative */
214 0, /* bitpos */
215 complain_overflow_bitfield, /* complain_on_overflow */
216 bfd_elf_generic_reloc, /* special_function */
217 "R_XSTORMY16_FPTR16", /* name */
218 false, /* partial_inplace */
219 0, /* src_mask */
220 0xffffffff, /* dst_mask */
221 false), /* pcrel_offset */
222
223 /* Low order 16 bit value of a high memory address. */
224 HOWTO (R_XSTORMY16_LO16, /* type */
225 0, /* rightshift */
226 2, /* size */
227 16, /* bitsize */
228 false, /* pc_relative */
229 0, /* bitpos */
230 complain_overflow_dont, /* complain_on_overflow */
231 bfd_elf_generic_reloc, /* special_function */
232 "R_XSTORMY16_LO16", /* name */
233 false, /* partial_inplace */
234 0, /* src_mask */
235 0xffff, /* dst_mask */
236 false), /* pcrel_offset */
237
238 /* High order 16 bit value of a high memory address. */
239 HOWTO (R_XSTORMY16_HI16, /* type */
240 16, /* rightshift */
241 2, /* size */
242 16, /* bitsize */
243 false, /* pc_relative */
244 0, /* bitpos */
245 complain_overflow_dont, /* complain_on_overflow */
246 bfd_elf_generic_reloc, /* special_function */
247 "R_XSTORMY16_HI16", /* name */
248 false, /* partial_inplace */
249 0, /* src_mask */
250 0xffff, /* dst_mask */
251 false), /* pcrel_offset */
252
253 /* A 12 bit absolute relocation. */
254 HOWTO (R_XSTORMY16_12, /* type */
255 0, /* rightshift */
256 2, /* size */
257 12, /* bitsize */
258 false, /* pc_relative */
259 0, /* bitpos */
260 complain_overflow_signed, /* complain_on_overflow */
261 bfd_elf_generic_reloc, /* special_function */
262 "R_XSTORMY16_12", /* name */
263 false, /* partial_inplace */
264 0x0000, /* src_mask */
265 0x0fff, /* dst_mask */
266 false), /* pcrel_offset */
267 };
268
269 static reloc_howto_type xstormy16_elf_howto_table2 [] =
270 {
271 /* GNU extension to record C++ vtable hierarchy */
272 HOWTO (R_XSTORMY16_GNU_VTINHERIT, /* type */
273 0, /* rightshift */
274 4, /* size */
275 0, /* bitsize */
276 false, /* pc_relative */
277 0, /* bitpos */
278 complain_overflow_dont, /* complain_on_overflow */
279 NULL, /* special_function */
280 "R_XSTORMY16_GNU_VTINHERIT", /* name */
281 false, /* partial_inplace */
282 0, /* src_mask */
283 0, /* dst_mask */
284 false), /* pcrel_offset */
285
286 /* GNU extension to record C++ vtable member usage */
287 HOWTO (R_XSTORMY16_GNU_VTENTRY, /* type */
288 0, /* rightshift */
289 4, /* size */
290 0, /* bitsize */
291 false, /* pc_relative */
292 0, /* bitpos */
293 complain_overflow_dont, /* complain_on_overflow */
294 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
295 "R_XSTORMY16_GNU_VTENTRY", /* name */
296 false, /* partial_inplace */
297 0, /* src_mask */
298 0, /* dst_mask */
299 false), /* pcrel_offset */
300
301 };
302
303 /* Map BFD reloc types to XSTORMY16 ELF reloc types. */
304
305 typedef struct xstormy16_reloc_map
306 {
307 bfd_reloc_code_real_type bfd_reloc_val;
308 unsigned int xstormy16_reloc_val;
309 reloc_howto_type * table;
310 } reloc_map;
311
312 static const reloc_map xstormy16_reloc_map [] =
313 {
314 { BFD_RELOC_NONE, R_XSTORMY16_NONE, xstormy16_elf_howto_table },
315 { BFD_RELOC_32, R_XSTORMY16_32, xstormy16_elf_howto_table },
316 { BFD_RELOC_16, R_XSTORMY16_16, xstormy16_elf_howto_table },
317 { BFD_RELOC_8, R_XSTORMY16_8, xstormy16_elf_howto_table },
318 { BFD_RELOC_32_PCREL, R_XSTORMY16_PC32, xstormy16_elf_howto_table },
319 { BFD_RELOC_16_PCREL, R_XSTORMY16_PC16, xstormy16_elf_howto_table },
320 { BFD_RELOC_8_PCREL, R_XSTORMY16_PC8, xstormy16_elf_howto_table },
321 { BFD_RELOC_XSTORMY16_REL_12, R_XSTORMY16_REL_12, xstormy16_elf_howto_table },
322 { BFD_RELOC_XSTORMY16_24, R_XSTORMY16_24, xstormy16_elf_howto_table },
323 { BFD_RELOC_XSTORMY16_FPTR16, R_XSTORMY16_FPTR16, xstormy16_elf_howto_table },
324 { BFD_RELOC_LO16, R_XSTORMY16_LO16, xstormy16_elf_howto_table },
325 { BFD_RELOC_HI16, R_XSTORMY16_HI16, xstormy16_elf_howto_table },
326 { BFD_RELOC_XSTORMY16_12, R_XSTORMY16_12, xstormy16_elf_howto_table },
327 { BFD_RELOC_VTABLE_INHERIT, R_XSTORMY16_GNU_VTINHERIT, xstormy16_elf_howto_table2 },
328 { BFD_RELOC_VTABLE_ENTRY, R_XSTORMY16_GNU_VTENTRY, xstormy16_elf_howto_table2 },
329 };
330
331 static reloc_howto_type *
xstormy16_reloc_type_lookup(bfd * abfd ATTRIBUTE_UNUSED,bfd_reloc_code_real_type code)332 xstormy16_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED,
333 bfd_reloc_code_real_type code)
334 {
335 unsigned int i;
336
337 for (i = ARRAY_SIZE (xstormy16_reloc_map); i--;)
338 {
339 const reloc_map * entry;
340
341 entry = xstormy16_reloc_map + i;
342
343 if (entry->bfd_reloc_val == code)
344 return entry->table + (entry->xstormy16_reloc_val
345 - entry->table[0].type);
346 }
347
348 return NULL;
349 }
350
351 static reloc_howto_type *
xstormy16_reloc_name_lookup(bfd * abfd ATTRIBUTE_UNUSED,const char * r_name)352 xstormy16_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
353 const char *r_name)
354 {
355 unsigned int i;
356
357 for (i = 0;
358 i < (sizeof (xstormy16_elf_howto_table)
359 / sizeof (xstormy16_elf_howto_table[0]));
360 i++)
361 if (xstormy16_elf_howto_table[i].name != NULL
362 && strcasecmp (xstormy16_elf_howto_table[i].name, r_name) == 0)
363 return &xstormy16_elf_howto_table[i];
364
365 for (i = 0;
366 i < (sizeof (xstormy16_elf_howto_table2)
367 / sizeof (xstormy16_elf_howto_table2[0]));
368 i++)
369 if (xstormy16_elf_howto_table2[i].name != NULL
370 && strcasecmp (xstormy16_elf_howto_table2[i].name, r_name) == 0)
371 return &xstormy16_elf_howto_table2[i];
372
373 return NULL;
374 }
375
376 /* Set the howto pointer for an XSTORMY16 ELF reloc. */
377
378 static bool
xstormy16_info_to_howto_rela(bfd * abfd,arelent * cache_ptr,Elf_Internal_Rela * dst)379 xstormy16_info_to_howto_rela (bfd * abfd,
380 arelent * cache_ptr,
381 Elf_Internal_Rela * dst)
382 {
383 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
384
385 if (r_type <= (unsigned int) R_XSTORMY16_12)
386 cache_ptr->howto = &xstormy16_elf_howto_table [r_type];
387 else if (r_type - R_XSTORMY16_GNU_VTINHERIT
388 <= ((unsigned int) R_XSTORMY16_GNU_VTENTRY
389 - (unsigned int) R_XSTORMY16_GNU_VTINHERIT))
390 cache_ptr->howto
391 = &xstormy16_elf_howto_table2 [r_type - R_XSTORMY16_GNU_VTINHERIT];
392 else
393 {
394 /* xgettext:c-format */
395 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
396 abfd, r_type);
397 bfd_set_error (bfd_error_bad_value);
398 return false;
399 }
400 return true;
401 }
402
403 /* We support 16-bit pointers to code above 64k by generating a thunk
404 below 64k containing a JMPF instruction to the final address. We
405 cannot, unfortunately, minimize the number of thunks unless the
406 -relax switch is given, as otherwise we have no idea where the
407 sections will fall in the address space. */
408
409 static bool
xstormy16_elf_check_relocs(bfd * abfd,struct bfd_link_info * info,asection * sec,const Elf_Internal_Rela * relocs)410 xstormy16_elf_check_relocs (bfd *abfd,
411 struct bfd_link_info *info,
412 asection *sec,
413 const Elf_Internal_Rela *relocs)
414 {
415 const Elf_Internal_Rela *rel, *relend;
416 struct elf_link_hash_entry **sym_hashes;
417 Elf_Internal_Shdr *symtab_hdr;
418 bfd_vma *local_plt_offsets;
419 asection *splt;
420 bfd *dynobj;
421
422 if (bfd_link_relocatable (info))
423 return true;
424
425 symtab_hdr = &elf_tdata(abfd)->symtab_hdr;
426 sym_hashes = elf_sym_hashes (abfd);
427 local_plt_offsets = elf_local_got_offsets (abfd);
428 dynobj = elf_hash_table(info)->dynobj;
429
430 relend = relocs + sec->reloc_count;
431 for (rel = relocs; rel < relend; ++rel)
432 {
433 unsigned long r_symndx;
434 struct elf_link_hash_entry *h;
435 bfd_vma *offset;
436
437 r_symndx = ELF32_R_SYM (rel->r_info);
438 if (r_symndx < symtab_hdr->sh_info)
439 h = NULL;
440 else
441 {
442 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
443 while (h->root.type == bfd_link_hash_indirect
444 || h->root.type == bfd_link_hash_warning)
445 h = (struct elf_link_hash_entry *) h->root.u.i.link;
446 }
447
448 switch (ELF32_R_TYPE (rel->r_info))
449 {
450 /* This relocation describes a 16-bit pointer to a function.
451 We may need to allocate a thunk in low memory; reserve memory
452 for it now. */
453 case R_XSTORMY16_FPTR16:
454 if (rel->r_addend != 0)
455 {
456 (*info->callbacks->warning)
457 (info, _("non-zero addend in @fptr reloc"), 0,
458 abfd, 0, 0);
459 }
460
461 if (dynobj == NULL)
462 elf_hash_table (info)->dynobj = dynobj = abfd;
463 splt = elf_hash_table (info)->splt;
464 if (splt == NULL)
465 {
466 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
467 | SEC_IN_MEMORY | SEC_LINKER_CREATED
468 | SEC_READONLY | SEC_CODE);
469
470 splt = bfd_make_section_anyway_with_flags (dynobj, ".plt",
471 flags);
472 elf_hash_table (info)->splt = splt;
473 if (splt == NULL
474 || !bfd_set_section_alignment (splt, 1))
475 return false;
476 }
477
478 if (h != NULL)
479 offset = &h->plt.offset;
480 else
481 {
482 if (local_plt_offsets == NULL)
483 {
484 size_t size;
485 unsigned int i;
486
487 size = symtab_hdr->sh_info * sizeof (bfd_vma);
488 local_plt_offsets = bfd_alloc (abfd, size);
489 if (local_plt_offsets == NULL)
490 return false;
491 elf_local_got_offsets (abfd) = local_plt_offsets;
492
493 for (i = 0; i < symtab_hdr->sh_info; i++)
494 local_plt_offsets[i] = (bfd_vma) -1;
495 }
496 offset = &local_plt_offsets[r_symndx];
497 }
498
499 if (*offset == (bfd_vma) -1)
500 {
501 *offset = splt->size;
502 splt->size += 4;
503 }
504 break;
505
506 /* This relocation describes the C++ object vtable hierarchy.
507 Reconstruct it for later use during GC. */
508 case R_XSTORMY16_GNU_VTINHERIT:
509 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
510 return false;
511 break;
512
513 /* This relocation describes which C++ vtable entries are actually
514 used. Record for later use during GC. */
515 case R_XSTORMY16_GNU_VTENTRY:
516 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
517 return false;
518 break;
519 }
520 }
521
522 return true;
523 }
524
525 /* A subroutine of xstormy16_elf_relax_section. If the global symbol H
526 is within the low 64k, remove any entry for it in the plt. */
527
528 struct relax_plt_data
529 {
530 asection *splt;
531 bool *again;
532 };
533
534 static bool
xstormy16_relax_plt_check(struct elf_link_hash_entry * h,void * xdata)535 xstormy16_relax_plt_check (struct elf_link_hash_entry *h, void * xdata)
536 {
537 struct relax_plt_data *data = (struct relax_plt_data *) xdata;
538
539 if (h->plt.offset != (bfd_vma) -1)
540 {
541 bfd_vma address;
542
543 if (h->root.type == bfd_link_hash_undefined
544 || h->root.type == bfd_link_hash_undefweak)
545 address = 0;
546 else
547 address = (h->root.u.def.section->output_section->vma
548 + h->root.u.def.section->output_offset
549 + h->root.u.def.value);
550
551 if (address <= 0xffff)
552 {
553 h->plt.offset = -1;
554 data->splt->size -= 4;
555 *data->again = true;
556 }
557 }
558
559 return true;
560 }
561
562 /* A subroutine of xstormy16_elf_relax_section. If the global symbol H
563 previously had a plt entry, give it a new entry offset. */
564
565 static bool
xstormy16_relax_plt_realloc(struct elf_link_hash_entry * h,void * xdata)566 xstormy16_relax_plt_realloc (struct elf_link_hash_entry *h, void * xdata)
567 {
568 bfd_vma *entry = (bfd_vma *) xdata;
569
570 if (h->plt.offset != (bfd_vma) -1)
571 {
572 h->plt.offset = *entry;
573 *entry += 4;
574 }
575
576 return true;
577 }
578
579 static bool
xstormy16_elf_relax_section(bfd * dynobj,asection * splt,struct bfd_link_info * info,bool * again)580 xstormy16_elf_relax_section (bfd *dynobj,
581 asection *splt,
582 struct bfd_link_info *info,
583 bool *again)
584 {
585 struct relax_plt_data relax_plt_data;
586 bfd *ibfd;
587
588 /* Assume nothing changes. */
589 *again = false;
590
591 if (bfd_link_relocatable (info)
592 || !is_elf_hash_table (info->hash))
593 return true;
594
595 /* We only relax the .plt section at the moment. */
596 if (dynobj != elf_hash_table (info)->dynobj
597 || strcmp (splt->name, ".plt") != 0)
598 return true;
599
600 /* Quick check for an empty plt. */
601 if (splt->size == 0)
602 return true;
603
604 /* Map across all global symbols; see which ones happen to
605 fall in the low 64k. */
606 relax_plt_data.splt = splt;
607 relax_plt_data.again = again;
608 elf_link_hash_traverse (elf_hash_table (info), xstormy16_relax_plt_check,
609 &relax_plt_data);
610
611 /* Likewise for local symbols, though that's somewhat less convenient
612 as we have to walk the list of input bfds and swap in symbol data. */
613 for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link.next)
614 {
615 bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd);
616 Elf_Internal_Shdr *symtab_hdr;
617 Elf_Internal_Sym *isymbuf = NULL;
618 unsigned int idx;
619
620 if (! local_plt_offsets)
621 continue;
622
623 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
624 if (symtab_hdr->sh_info != 0)
625 {
626 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
627 if (isymbuf == NULL)
628 isymbuf = bfd_elf_get_elf_syms (ibfd, symtab_hdr,
629 symtab_hdr->sh_info, 0,
630 NULL, NULL, NULL);
631 if (isymbuf == NULL)
632 return false;
633 }
634
635 for (idx = 0; idx < symtab_hdr->sh_info; ++idx)
636 {
637 Elf_Internal_Sym *isym;
638 asection *tsec;
639 bfd_vma address;
640
641 if (local_plt_offsets[idx] == (bfd_vma) -1)
642 continue;
643
644 isym = &isymbuf[idx];
645 if (isym->st_shndx == SHN_UNDEF)
646 continue;
647 else if (isym->st_shndx == SHN_ABS)
648 tsec = bfd_abs_section_ptr;
649 else if (isym->st_shndx == SHN_COMMON)
650 tsec = bfd_com_section_ptr;
651 else
652 tsec = bfd_section_from_elf_index (ibfd, isym->st_shndx);
653
654 address = (tsec->output_section->vma
655 + tsec->output_offset
656 + isym->st_value);
657 if (address <= 0xffff)
658 {
659 local_plt_offsets[idx] = -1;
660 splt->size -= 4;
661 *again = true;
662 }
663 }
664
665 if (isymbuf != NULL
666 && symtab_hdr->contents != (unsigned char *) isymbuf)
667 {
668 if (! info->keep_memory)
669 free (isymbuf);
670 else
671 {
672 /* Cache the symbols for elf_link_input_bfd. */
673 symtab_hdr->contents = (unsigned char *) isymbuf;
674 }
675 }
676 }
677
678 /* If we changed anything, walk the symbols again to reallocate
679 .plt entry addresses. */
680 if (*again && splt->size > 0)
681 {
682 bfd_vma entry = 0;
683
684 elf_link_hash_traverse (elf_hash_table (info),
685 xstormy16_relax_plt_realloc, &entry);
686
687 for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link.next)
688 {
689 bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd);
690 unsigned int nlocals = elf_tdata (ibfd)->symtab_hdr.sh_info;
691 unsigned int idx;
692
693 if (! local_plt_offsets)
694 continue;
695
696 for (idx = 0; idx < nlocals; ++idx)
697 if (local_plt_offsets[idx] != (bfd_vma) -1)
698 {
699 local_plt_offsets[idx] = entry;
700 entry += 4;
701 }
702 }
703 }
704
705 return true;
706 }
707
708 static bool
xstormy16_elf_always_size_sections(bfd * output_bfd ATTRIBUTE_UNUSED,struct bfd_link_info * info)709 xstormy16_elf_always_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
710 struct bfd_link_info *info)
711 {
712 bfd *dynobj;
713 asection *splt;
714
715 if (bfd_link_relocatable (info))
716 return true;
717
718 dynobj = elf_hash_table (info)->dynobj;
719 if (dynobj == NULL)
720 return true;
721
722 splt = elf_hash_table (info)->splt;
723 BFD_ASSERT (splt != NULL);
724
725 splt->contents = bfd_zalloc (dynobj, splt->size);
726 if (splt->contents == NULL)
727 return false;
728
729 return true;
730 }
731
732 /* Relocate an XSTORMY16 ELF section.
733
734 The RELOCATE_SECTION function is called by the new ELF backend linker
735 to handle the relocations for a section.
736
737 The relocs are always passed as Rela structures; if the section
738 actually uses Rel structures, the r_addend field will always be
739 zero.
740
741 This function is responsible for adjusting the section contents as
742 necessary, and (if using Rela relocs and generating a relocatable
743 output file) adjusting the reloc addend as necessary.
744
745 This function does not have to worry about setting the reloc
746 address or the reloc symbol index.
747
748 LOCAL_SYMS is a pointer to the swapped in local symbols.
749
750 LOCAL_SECTIONS is an array giving the section in the input file
751 corresponding to the st_shndx field of each local symbol.
752
753 The global hash table entry for the global symbols can be found
754 via elf_sym_hashes (input_bfd).
755
756 When generating relocatable output, this function must handle
757 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
758 going to be the section symbol corresponding to the output
759 section, which means that the addend must be adjusted
760 accordingly. */
761
762 static int
xstormy16_elf_relocate_section(bfd * output_bfd ATTRIBUTE_UNUSED,struct bfd_link_info * info,bfd * input_bfd,asection * input_section,bfd_byte * contents,Elf_Internal_Rela * relocs,Elf_Internal_Sym * local_syms,asection ** local_sections)763 xstormy16_elf_relocate_section (bfd * output_bfd ATTRIBUTE_UNUSED,
764 struct bfd_link_info * info,
765 bfd * input_bfd,
766 asection * input_section,
767 bfd_byte * contents,
768 Elf_Internal_Rela * relocs,
769 Elf_Internal_Sym * local_syms,
770 asection ** local_sections)
771 {
772 Elf_Internal_Shdr * symtab_hdr;
773 struct elf_link_hash_entry ** sym_hashes;
774 Elf_Internal_Rela * rel;
775 Elf_Internal_Rela * relend;
776 asection *splt;
777
778 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
779 sym_hashes = elf_sym_hashes (input_bfd);
780 relend = relocs + input_section->reloc_count;
781
782 splt = elf_hash_table (info)->splt;
783
784 for (rel = relocs; rel < relend; rel ++)
785 {
786 reloc_howto_type * howto;
787 unsigned long r_symndx;
788 Elf_Internal_Sym * sym;
789 asection * sec;
790 struct elf_link_hash_entry * h;
791 bfd_vma relocation;
792 bfd_reloc_status_type r;
793 const char * name = NULL;
794 int r_type;
795
796 r_type = ELF32_R_TYPE (rel->r_info);
797
798 if ( r_type == R_XSTORMY16_GNU_VTINHERIT
799 || r_type == R_XSTORMY16_GNU_VTENTRY)
800 continue;
801
802 r_symndx = ELF32_R_SYM (rel->r_info);
803 howto = xstormy16_elf_howto_table + ELF32_R_TYPE (rel->r_info);
804 h = NULL;
805 sym = NULL;
806 sec = NULL;
807
808 if (r_symndx < symtab_hdr->sh_info)
809 {
810 sym = local_syms + r_symndx;
811 sec = local_sections [r_symndx];
812 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
813 }
814 else
815 {
816 bool unresolved_reloc, warned, ignored;
817
818 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
819 r_symndx, symtab_hdr, sym_hashes,
820 h, sec, relocation,
821 unresolved_reloc, warned, ignored);
822 }
823
824 if (sec != NULL && discarded_section (sec))
825 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
826 rel, 1, relend, howto, 0, contents);
827
828 if (bfd_link_relocatable (info))
829 continue;
830
831 if (h != NULL)
832 name = h->root.root.string;
833 else
834 {
835 name = (bfd_elf_string_from_elf_section
836 (input_bfd, symtab_hdr->sh_link, sym->st_name));
837 if (name == NULL || *name == '\0')
838 name = bfd_section_name (sec);
839 }
840
841 switch (ELF32_R_TYPE (rel->r_info))
842 {
843 case R_XSTORMY16_24:
844 {
845 bfd_vma reloc = relocation + rel->r_addend;
846 unsigned int x;
847
848 x = bfd_get_32 (input_bfd, contents + rel->r_offset);
849 x &= 0x0000ff00;
850 x |= reloc & 0xff;
851 x |= (reloc << 8) & 0xffff0000;
852 bfd_put_32 (input_bfd, x, contents + rel->r_offset);
853
854 if (reloc & ~0xffffff)
855 r = bfd_reloc_overflow;
856 else
857 r = bfd_reloc_ok;
858 break;
859 }
860
861 case R_XSTORMY16_FPTR16:
862 {
863 bfd_vma *plt_offset;
864
865 if (h != NULL)
866 plt_offset = &h->plt.offset;
867 else
868 plt_offset = elf_local_got_offsets (input_bfd) + r_symndx;
869
870 if (relocation <= 0xffff)
871 {
872 /* If the symbol is in range for a 16-bit address, we should
873 have deallocated the plt entry in relax_section. */
874 BFD_ASSERT (*plt_offset == (bfd_vma) -1);
875 }
876 else
877 {
878 /* If the symbol is out of range for a 16-bit address,
879 we must have allocated a plt entry. */
880 BFD_ASSERT (*plt_offset != (bfd_vma) -1);
881
882 /* If this is the first time we've processed this symbol,
883 fill in the plt entry with the correct symbol address. */
884 if ((*plt_offset & 1) == 0)
885 {
886 unsigned int x;
887
888 x = 0x00000200; /* jmpf */
889 x |= relocation & 0xff;
890 x |= (relocation << 8) & 0xffff0000;
891 bfd_put_32 (input_bfd, x, splt->contents + *plt_offset);
892 *plt_offset |= 1;
893 }
894
895 relocation = (splt->output_section->vma
896 + splt->output_offset
897 + (*plt_offset & -2));
898 }
899 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
900 contents, rel->r_offset,
901 relocation, 0);
902 break;
903 }
904
905 default:
906 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
907 contents, rel->r_offset,
908 relocation, rel->r_addend);
909 break;
910 }
911
912 if (r != bfd_reloc_ok)
913 {
914 const char * msg = NULL;
915
916 switch (r)
917 {
918 case bfd_reloc_overflow:
919 (*info->callbacks->reloc_overflow)
920 (info, (h ? &h->root : NULL), name, howto->name,
921 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
922 break;
923
924 case bfd_reloc_undefined:
925 (*info->callbacks->undefined_symbol)
926 (info, name, input_bfd, input_section, rel->r_offset, true);
927 break;
928
929 case bfd_reloc_outofrange:
930 msg = _("internal error: out of range error");
931 break;
932
933 case bfd_reloc_notsupported:
934 msg = _("internal error: unsupported relocation error");
935 break;
936
937 case bfd_reloc_dangerous:
938 msg = _("internal error: dangerous relocation");
939 break;
940
941 default:
942 msg = _("internal error: unknown error");
943 break;
944 }
945
946 if (msg)
947 (*info->callbacks->warning) (info, msg, name, input_bfd,
948 input_section, rel->r_offset);
949 }
950 }
951
952 return true;
953 }
954
955 /* This must exist if dynobj is ever set. */
956
957 static bool
xstormy16_elf_finish_dynamic_sections(bfd * abfd ATTRIBUTE_UNUSED,struct bfd_link_info * info)958 xstormy16_elf_finish_dynamic_sections (bfd *abfd ATTRIBUTE_UNUSED,
959 struct bfd_link_info *info)
960 {
961 bfd *dynobj = elf_hash_table (info)->dynobj;
962 asection *splt = elf_hash_table (info)->splt;
963
964 /* As an extra sanity check, verify that all plt entries have
965 been filled in. */
966
967 if (dynobj != NULL && splt != NULL)
968 {
969 bfd_byte *contents = splt->contents;
970 unsigned int i, size = splt->size;
971
972 for (i = 0; i < size; i += 4)
973 {
974 unsigned int x = bfd_get_32 (dynobj, contents + i);
975
976 BFD_ASSERT (x != 0);
977 }
978 }
979
980 return true;
981 }
982
983 /* Return the section that should be marked against GC for a given
984 relocation. */
985
986 static asection *
xstormy16_elf_gc_mark_hook(asection * sec,struct bfd_link_info * info,Elf_Internal_Rela * rel,struct elf_link_hash_entry * h,Elf_Internal_Sym * sym)987 xstormy16_elf_gc_mark_hook (asection *sec,
988 struct bfd_link_info *info,
989 Elf_Internal_Rela *rel,
990 struct elf_link_hash_entry *h,
991 Elf_Internal_Sym *sym)
992 {
993 if (h != NULL)
994 switch (ELF32_R_TYPE (rel->r_info))
995 {
996 case R_XSTORMY16_GNU_VTINHERIT:
997 case R_XSTORMY16_GNU_VTENTRY:
998 return NULL;
999 }
1000
1001 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1002 }
1003
1004 #define ELF_ARCH bfd_arch_xstormy16
1005 #define ELF_MACHINE_CODE EM_XSTORMY16
1006 #define ELF_MAXPAGESIZE 0x100
1007
1008 #define TARGET_LITTLE_SYM xstormy16_elf32_vec
1009 #define TARGET_LITTLE_NAME "elf32-xstormy16"
1010
1011 #define elf_info_to_howto_rel NULL
1012 #define elf_info_to_howto xstormy16_info_to_howto_rela
1013 #define elf_backend_relocate_section xstormy16_elf_relocate_section
1014 #define elf_backend_gc_mark_hook xstormy16_elf_gc_mark_hook
1015 #define elf_backend_check_relocs xstormy16_elf_check_relocs
1016 #define elf_backend_always_size_sections \
1017 xstormy16_elf_always_size_sections
1018 #define elf_backend_omit_section_dynsym \
1019 _bfd_elf_omit_section_dynsym_all
1020 #define elf_backend_finish_dynamic_sections \
1021 xstormy16_elf_finish_dynamic_sections
1022
1023 #define elf_backend_can_gc_sections 1
1024 #define elf_backend_rela_normal 1
1025
1026 #define bfd_elf32_bfd_reloc_type_lookup xstormy16_reloc_type_lookup
1027 #define bfd_elf32_bfd_reloc_name_lookup \
1028 xstormy16_reloc_name_lookup
1029 #define bfd_elf32_bfd_relax_section xstormy16_elf_relax_section
1030
1031 #include "elf32-target.h"
1032