1 /* IQ2000-specific support for 32-bit ELF.
2 Copyright (C) 2003-2024 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, MA 02110-1301, USA. */
19
20 #include "sysdep.h"
21 #include "bfd.h"
22 #include "libbfd.h"
23 #include "elf-bfd.h"
24 #include "elf/iq2000.h"
25 #include "libiberty.h"
26
27 /* Forward declarations. */
28
29 static bfd_reloc_status_type iq2000_elf_howto_hi16_reloc (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
30
31
32 static reloc_howto_type iq2000_elf_howto_table [] =
33 {
34 /* This reloc does nothing. */
35
36 HOWTO (R_IQ2000_NONE, /* type */
37 0, /* rightshift */
38 0, /* size */
39 0, /* bitsize */
40 false, /* pc_relative */
41 0, /* bitpos */
42 complain_overflow_dont, /* complain_on_overflow */
43 bfd_elf_generic_reloc, /* special_function */
44 "R_IQ2000_NONE", /* name */
45 false, /* partial_inplace */
46 0, /* src_mask */
47 0, /* dst_mask */
48 false), /* pcrel_offset */
49
50 /* A 16 bit absolute relocation. */
51 HOWTO (R_IQ2000_16, /* type */
52 0, /* rightshift */
53 2, /* size */
54 16, /* bitsize */
55 false, /* pc_relative */
56 0, /* bitpos */
57 complain_overflow_bitfield, /* complain_on_overflow */
58 bfd_elf_generic_reloc, /* special_function */
59 "R_IQ2000_16", /* name */
60 false, /* partial_inplace */
61 0x0000, /* src_mask */
62 0xffff, /* dst_mask */
63 false), /* pcrel_offset */
64
65 /* A 32 bit absolute relocation. */
66 HOWTO (R_IQ2000_32, /* type */
67 0, /* rightshift */
68 4, /* size */
69 31, /* bitsize */
70 false, /* pc_relative */
71 0, /* bitpos */
72 complain_overflow_bitfield, /* complain_on_overflow */
73 bfd_elf_generic_reloc, /* special_function */
74 "R_IQ2000_32", /* name */
75 false, /* partial_inplace */
76 0x00000000, /* src_mask */
77 0x7fffffff, /* dst_mask */
78 false), /* pcrel_offset */
79
80 /* 26 bit branch address. */
81 HOWTO (R_IQ2000_26, /* type */
82 2, /* rightshift */
83 4, /* size */
84 26, /* bitsize */
85 false, /* pc_relative */
86 0, /* bitpos */
87 complain_overflow_dont, /* complain_on_overflow */
88 /* This needs complex overflow
89 detection, because the upper four
90 bits must match the PC. */
91 bfd_elf_generic_reloc, /* special_function */
92 "R_IQ2000_26", /* name */
93 false, /* partial_inplace */
94 0x00000000, /* src_mask */
95 0x03ffffff, /* dst_mask */
96 false), /* pcrel_offset */
97
98 /* 16 bit PC relative reference. */
99 HOWTO (R_IQ2000_PC16, /* type */
100 2, /* rightshift */
101 4, /* size */
102 16, /* bitsize */
103 true, /* pc_relative */
104 0, /* bitpos */
105 complain_overflow_signed, /* complain_on_overflow */
106 bfd_elf_generic_reloc, /* special_function */
107 "R_IQ2000_PC16", /* name */
108 false, /* partial_inplace */
109 0x0000, /* src_mask */
110 0xffff, /* dst_mask */
111 true), /* pcrel_offset */
112
113 /* high 16 bits of symbol value. */
114 HOWTO (R_IQ2000_HI16, /* type */
115 16, /* rightshift */
116 4, /* size */
117 15, /* bitsize */
118 false, /* pc_relative */
119 0, /* bitpos */
120 complain_overflow_dont, /* complain_on_overflow */
121 iq2000_elf_howto_hi16_reloc, /* special_function */
122 "R_IQ2000_HI16", /* name */
123 false, /* partial_inplace */
124 0x0000, /* src_mask */
125 0x7fff, /* dst_mask */
126 false), /* pcrel_offset */
127
128 /* Low 16 bits of symbol value. */
129 HOWTO (R_IQ2000_LO16, /* type */
130 0, /* rightshift */
131 4, /* size */
132 16, /* bitsize */
133 false, /* pc_relative */
134 0, /* bitpos */
135 complain_overflow_dont, /* complain_on_overflow */
136 bfd_elf_generic_reloc, /* special_function */
137 "R_IQ2000_LO16", /* name */
138 false, /* partial_inplace */
139 0x0000, /* src_mask */
140 0xffff, /* dst_mask */
141 false), /* pcrel_offset */
142
143 /* 16-bit jump offset. */
144 HOWTO (R_IQ2000_OFFSET_16, /* type */
145 2, /* rightshift */
146 4, /* size */
147 16, /* bitsize */
148 false, /* pc_relative */
149 0, /* bitpos */
150 complain_overflow_dont, /* complain_on_overflow */
151 bfd_elf_generic_reloc, /* special_function */
152 "R_IQ2000_OFFSET_16", /* name */
153 false, /* partial_inplace */
154 0x0000, /* src_mask */
155 0xffff, /* dst_mask */
156 false), /* pcrel_offset */
157
158 /* 21-bit jump offset. */
159 HOWTO (R_IQ2000_OFFSET_21, /* type */
160 2, /* rightshift */
161 4, /* size */
162 21, /* bitsize */
163 false, /* pc_relative */
164 0, /* bitpos */
165 complain_overflow_dont, /* complain_on_overflow */
166 bfd_elf_generic_reloc, /* special_function */
167 "R_IQ2000_OFFSET_21", /* name */
168 false, /* partial_inplace */
169 0x000000, /* src_mask */
170 0x1fffff, /* dst_mask */
171 false), /* pcrel_offset */
172
173 /* unsigned high 16 bits of value. */
174 HOWTO (R_IQ2000_OFFSET_21, /* type */
175 16, /* rightshift */
176 4, /* size */
177 16, /* bitsize */
178 false, /* pc_relative */
179 0, /* bitpos */
180 complain_overflow_dont, /* complain_on_overflow */
181 bfd_elf_generic_reloc, /* special_function */
182 "R_IQ2000_UHI16", /* name */
183 false, /* partial_inplace */
184 0x0000, /* src_mask */
185 0x7fff, /* dst_mask */
186 false), /* pcrel_offset */
187
188 /* A 32 bit absolute debug relocation. */
189 HOWTO (R_IQ2000_32_DEBUG, /* type */
190 0, /* rightshift */
191 4, /* size */
192 32, /* bitsize */
193 false, /* pc_relative */
194 0, /* bitpos */
195 complain_overflow_bitfield, /* complain_on_overflow */
196 bfd_elf_generic_reloc, /* special_function */
197 "R_IQ2000_32", /* name */
198 false, /* partial_inplace */
199 0x00000000, /* src_mask */
200 0xffffffff, /* dst_mask */
201 false), /* pcrel_offset */
202
203 };
204
205 /* GNU extension to record C++ vtable hierarchy. */
206 static reloc_howto_type iq2000_elf_vtinherit_howto =
207 HOWTO (R_IQ2000_GNU_VTINHERIT, /* type */
208 0, /* rightshift */
209 4, /* size */
210 0, /* bitsize */
211 false, /* pc_relative */
212 0, /* bitpos */
213 complain_overflow_dont, /* complain_on_overflow */
214 NULL, /* special_function */
215 "R_IQ2000_GNU_VTINHERIT", /* name */
216 false, /* partial_inplace */
217 0, /* src_mask */
218 0, /* dst_mask */
219 false); /* pcrel_offset */
220
221 /* GNU extension to record C++ vtable member usage. */
222 static reloc_howto_type iq2000_elf_vtentry_howto =
223 HOWTO (R_IQ2000_GNU_VTENTRY, /* type */
224 0, /* rightshift */
225 4, /* size */
226 0, /* bitsize */
227 false, /* pc_relative */
228 0, /* bitpos */
229 complain_overflow_dont, /* complain_on_overflow */
230 NULL, /* special_function */
231 "R_IQ2000_GNU_VTENTRY", /* name */
232 false, /* partial_inplace */
233 0, /* src_mask */
234 0, /* dst_mask */
235 false); /* pcrel_offset */
236
237
238 static bfd_reloc_status_type
iq2000_elf_howto_hi16_reloc(bfd * abfd ATTRIBUTE_UNUSED,arelent * reloc_entry,asymbol * symbol,void * data,asection * input_section,bfd * output_bfd,char ** error_message ATTRIBUTE_UNUSED)239 iq2000_elf_howto_hi16_reloc (bfd *abfd ATTRIBUTE_UNUSED,
240 arelent *reloc_entry,
241 asymbol *symbol,
242 void * data,
243 asection *input_section,
244 bfd *output_bfd,
245 char **error_message ATTRIBUTE_UNUSED)
246 {
247 bfd_reloc_status_type ret;
248 bfd_vma relocation;
249
250 /* If we're relocating and this an external symbol,
251 we don't want to change anything. */
252 if (output_bfd != (bfd *) NULL
253 && (symbol->flags & BSF_SECTION_SYM) == 0
254 && reloc_entry->addend == 0)
255 {
256 reloc_entry->address += input_section->output_offset;
257 return bfd_reloc_ok;
258 }
259
260 if (bfd_is_com_section (symbol->section))
261 relocation = 0;
262 else
263 relocation = symbol->value;
264
265 relocation += symbol->section->output_section->vma;
266 relocation += symbol->section->output_offset;
267 relocation += reloc_entry->addend;
268
269 /* If %lo will have sign-extension, compensate by add 0x10000 to hi portion. */
270 if (relocation & 0x8000)
271 reloc_entry->addend += 0x10000;
272
273 /* Now do the reloc in the usual way. */
274 ret = bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
275 input_section, output_bfd, error_message);
276
277 /* Put it back the way it was. */
278 if (relocation & 0x8000)
279 reloc_entry->addend -= 0x10000;
280
281 return ret;
282 }
283
284 static bfd_reloc_status_type
iq2000_elf_relocate_hi16(bfd * input_bfd,Elf_Internal_Rela * relhi,bfd_byte * contents,bfd_vma value)285 iq2000_elf_relocate_hi16 (bfd *input_bfd,
286 Elf_Internal_Rela *relhi,
287 bfd_byte *contents,
288 bfd_vma value)
289 {
290 bfd_vma insn;
291
292 insn = bfd_get_32 (input_bfd, contents + relhi->r_offset);
293
294 value += relhi->r_addend;
295 value &= 0x7fffffff; /* Mask off top-bit which is Harvard mask bit. */
296
297 /* If top-bit of %lo value is on, this means that %lo will
298 sign-propagate and so we compensate by adding 1 to %hi value. */
299 if (value & 0x8000)
300 value += 0x10000;
301
302 value >>= 16;
303 insn = ((insn & ~0xFFFF) | value);
304
305 bfd_put_32 (input_bfd, insn, contents + relhi->r_offset);
306 return bfd_reloc_ok;
307 }
308
309 static bfd_reloc_status_type
iq2000_elf_relocate_offset16(bfd * input_bfd,Elf_Internal_Rela * rel,bfd_byte * contents,bfd_vma value,bfd_vma location)310 iq2000_elf_relocate_offset16 (bfd *input_bfd,
311 Elf_Internal_Rela *rel,
312 bfd_byte *contents,
313 bfd_vma value,
314 bfd_vma location)
315 {
316 bfd_vma insn;
317 bfd_vma jtarget;
318
319 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
320
321 value += rel->r_addend;
322
323 if (value & 3)
324 return bfd_reloc_dangerous;
325
326 jtarget = (value & 0x3fffc) | (location & 0xf0000000L);
327
328 if (jtarget != value)
329 return bfd_reloc_overflow;
330
331 insn = (insn & ~0xFFFF) | ((value >> 2) & 0xFFFF);
332
333 bfd_put_32 (input_bfd, insn, contents + rel->r_offset);
334 return bfd_reloc_ok;
335 }
336
337 /* Map BFD reloc types to IQ2000 ELF reloc types. */
338
339 static reloc_howto_type *
iq2000_reloc_type_lookup(bfd * abfd ATTRIBUTE_UNUSED,bfd_reloc_code_real_type code)340 iq2000_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
341 bfd_reloc_code_real_type code)
342 {
343 /* Note that the iq2000_elf_howto_table is indxed by the R_
344 constants. Thus, the order that the howto records appear in the
345 table *must* match the order of the relocation types defined in
346 include/elf/iq2000.h. */
347
348 switch (code)
349 {
350 case BFD_RELOC_NONE:
351 return &iq2000_elf_howto_table[ (int) R_IQ2000_NONE];
352 case BFD_RELOC_16:
353 return &iq2000_elf_howto_table[ (int) R_IQ2000_16];
354 case BFD_RELOC_32:
355 return &iq2000_elf_howto_table[ (int) R_IQ2000_32];
356 case BFD_RELOC_MIPS_JMP:
357 return &iq2000_elf_howto_table[ (int) R_IQ2000_26];
358 case BFD_RELOC_IQ2000_OFFSET_16:
359 return &iq2000_elf_howto_table[ (int) R_IQ2000_OFFSET_16];
360 case BFD_RELOC_IQ2000_OFFSET_21:
361 return &iq2000_elf_howto_table[ (int) R_IQ2000_OFFSET_21];
362 case BFD_RELOC_16_PCREL_S2:
363 return &iq2000_elf_howto_table[ (int) R_IQ2000_PC16];
364 case BFD_RELOC_HI16:
365 return &iq2000_elf_howto_table[ (int) R_IQ2000_HI16];
366 case BFD_RELOC_IQ2000_UHI16:
367 return &iq2000_elf_howto_table[ (int) R_IQ2000_UHI16];
368 case BFD_RELOC_LO16:
369 return &iq2000_elf_howto_table[ (int) R_IQ2000_LO16];
370 case BFD_RELOC_VTABLE_INHERIT:
371 return &iq2000_elf_vtinherit_howto;
372 case BFD_RELOC_VTABLE_ENTRY:
373 return &iq2000_elf_vtentry_howto;
374 default:
375 /* Pacify gcc -Wall. */
376 return NULL;
377 }
378 return NULL;
379 }
380
381 static reloc_howto_type *
iq2000_reloc_name_lookup(bfd * abfd ATTRIBUTE_UNUSED,const char * r_name)382 iq2000_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name)
383 {
384 unsigned int i;
385
386 for (i = 0;
387 i < (sizeof (iq2000_elf_howto_table)
388 / sizeof (iq2000_elf_howto_table[0]));
389 i++)
390 if (iq2000_elf_howto_table[i].name != NULL
391 && strcasecmp (iq2000_elf_howto_table[i].name, r_name) == 0)
392 return &iq2000_elf_howto_table[i];
393
394 if (strcasecmp (iq2000_elf_vtinherit_howto.name, r_name) == 0)
395 return &iq2000_elf_vtinherit_howto;
396 if (strcasecmp (iq2000_elf_vtentry_howto.name, r_name) == 0)
397 return &iq2000_elf_vtentry_howto;
398
399 return NULL;
400 }
401
402 /* Perform a single relocation. By default we use the standard BFD
403 routines. */
404
405 static bfd_reloc_status_type
iq2000_final_link_relocate(reloc_howto_type * howto,bfd * input_bfd,asection * input_section,bfd_byte * contents,Elf_Internal_Rela * rel,bfd_vma relocation)406 iq2000_final_link_relocate (reloc_howto_type * howto,
407 bfd * input_bfd,
408 asection * input_section,
409 bfd_byte * contents,
410 Elf_Internal_Rela * rel,
411 bfd_vma relocation)
412 {
413 return _bfd_final_link_relocate (howto, input_bfd, input_section,
414 contents, rel->r_offset,
415 relocation, rel->r_addend);
416 }
417
418 /* Set the howto pointer for a IQ2000 ELF reloc. */
419
420 static bool
iq2000_info_to_howto_rela(bfd * abfd ATTRIBUTE_UNUSED,arelent * cache_ptr,Elf_Internal_Rela * dst)421 iq2000_info_to_howto_rela (bfd * abfd ATTRIBUTE_UNUSED,
422 arelent * cache_ptr,
423 Elf_Internal_Rela * dst)
424 {
425 unsigned int r_type;
426
427 r_type = ELF32_R_TYPE (dst->r_info);
428 switch (r_type)
429 {
430 case R_IQ2000_GNU_VTINHERIT:
431 cache_ptr->howto = & iq2000_elf_vtinherit_howto;
432 break;
433
434 case R_IQ2000_GNU_VTENTRY:
435 cache_ptr->howto = & iq2000_elf_vtentry_howto;
436 break;
437
438 default:
439 if (r_type >= ARRAY_SIZE (iq2000_elf_howto_table))
440 {
441 /* xgettext:c-format */
442 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
443 abfd, r_type);
444 bfd_set_error (bfd_error_bad_value);
445 return false;
446 }
447 cache_ptr->howto = & iq2000_elf_howto_table [r_type];
448 break;
449 }
450 return true;
451 }
452
453 /* Look through the relocs for a section during the first phase.
454 Since we don't do .gots or .plts, we just need to consider the
455 virtual table relocs for gc. */
456
457 static bool
iq2000_elf_check_relocs(bfd * abfd,struct bfd_link_info * info,asection * sec,const Elf_Internal_Rela * relocs)458 iq2000_elf_check_relocs (bfd *abfd,
459 struct bfd_link_info *info,
460 asection *sec,
461 const Elf_Internal_Rela *relocs)
462 {
463 Elf_Internal_Shdr *symtab_hdr;
464 struct elf_link_hash_entry **sym_hashes;
465 const Elf_Internal_Rela *rel;
466 const Elf_Internal_Rela *rel_end;
467 bool changed = false;
468
469 if (bfd_link_relocatable (info))
470 return true;
471
472 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
473 sym_hashes = elf_sym_hashes (abfd);
474
475 rel_end = relocs + sec->reloc_count;
476 for (rel = relocs; rel < rel_end; rel++)
477 {
478 struct elf_link_hash_entry *h;
479 unsigned long r_symndx;
480
481 r_symndx = ELF32_R_SYM (rel->r_info);
482 if (r_symndx < symtab_hdr->sh_info)
483 h = NULL;
484 else
485 {
486 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
487 while (h->root.type == bfd_link_hash_indirect
488 || h->root.type == bfd_link_hash_warning)
489 h = (struct elf_link_hash_entry *) h->root.u.i.link;
490 }
491
492 switch (ELF32_R_TYPE (rel->r_info))
493 {
494 /* This relocation describes the C++ object vtable
495 hierarchy. Reconstruct it for later use during GC. */
496 case R_IQ2000_GNU_VTINHERIT:
497 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
498 return false;
499 break;
500
501 /* This relocation describes which C++ vtable entries
502 are actually used. Record for later use during GC. */
503 case R_IQ2000_GNU_VTENTRY:
504 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
505 return false;
506 break;
507
508 case R_IQ2000_32:
509 /* For debug section, change to special harvard-aware relocations. */
510 if (startswith (sec->name, ".debug")
511 || startswith (sec->name, ".stab")
512 || startswith (sec->name, ".eh_frame"))
513 {
514 ((Elf_Internal_Rela *) rel)->r_info
515 = ELF32_R_INFO (ELF32_R_SYM (rel->r_info), R_IQ2000_32_DEBUG);
516 changed = true;
517 }
518 break;
519 }
520 }
521
522 if (changed)
523 /* Note that we've changed relocs, otherwise if !info->keep_memory
524 we'll free the relocs and lose our changes. */
525 elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs;
526
527 return true;
528 }
529
530
531 /* Relocate a IQ2000 ELF section.
532 There is some attempt to make this function usable for many architectures,
533 both USE_REL and USE_RELA ['twould be nice if such a critter existed],
534 if only to serve as a learning tool.
535
536 The RELOCATE_SECTION function is called by the new ELF backend linker
537 to handle the relocations for a section.
538
539 The relocs are always passed as Rela structures; if the section
540 actually uses Rel structures, the r_addend field will always be
541 zero.
542
543 This function is responsible for adjusting the section contents as
544 necessary, and (if using Rela relocs and generating a relocatable
545 output file) adjusting the reloc addend as necessary.
546
547 This function does not have to worry about setting the reloc
548 address or the reloc symbol index.
549
550 LOCAL_SYMS is a pointer to the swapped in local symbols.
551
552 LOCAL_SECTIONS is an array giving the section in the input file
553 corresponding to the st_shndx field of each local symbol.
554
555 The global hash table entry for the global symbols can be found
556 via elf_sym_hashes (input_bfd).
557
558 When generating relocatable output, this function must handle
559 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
560 going to be the section symbol corresponding to the output
561 section, which means that the addend must be adjusted
562 accordingly. */
563
564 static int
iq2000_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)565 iq2000_elf_relocate_section (bfd * output_bfd ATTRIBUTE_UNUSED,
566 struct bfd_link_info * info,
567 bfd * input_bfd,
568 asection * input_section,
569 bfd_byte * contents,
570 Elf_Internal_Rela * relocs,
571 Elf_Internal_Sym * local_syms,
572 asection ** local_sections)
573 {
574 Elf_Internal_Shdr * symtab_hdr;
575 struct elf_link_hash_entry ** sym_hashes;
576 Elf_Internal_Rela * rel;
577 Elf_Internal_Rela * relend;
578
579 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
580 sym_hashes = elf_sym_hashes (input_bfd);
581 relend = relocs + input_section->reloc_count;
582
583 for (rel = relocs; rel < relend; rel ++)
584 {
585 reloc_howto_type * howto;
586 unsigned long r_symndx;
587 Elf_Internal_Sym * sym;
588 asection * sec;
589 struct elf_link_hash_entry * h;
590 bfd_vma relocation;
591 bfd_reloc_status_type r;
592 const char * name = NULL;
593 int r_type;
594
595 r_type = ELF32_R_TYPE (rel->r_info);
596
597 if ( r_type == R_IQ2000_GNU_VTINHERIT
598 || r_type == R_IQ2000_GNU_VTENTRY)
599 continue;
600
601 r_symndx = ELF32_R_SYM (rel->r_info);
602
603 howto = iq2000_elf_howto_table + ELF32_R_TYPE (rel->r_info);
604 h = NULL;
605 sym = NULL;
606 sec = NULL;
607
608 if (r_symndx < symtab_hdr->sh_info)
609 {
610 asection *osec;
611
612 sym = local_syms + r_symndx;
613 osec = sec = local_sections [r_symndx];
614 if ((sec->flags & SEC_MERGE)
615 && ELF_ST_TYPE (sym->st_info) == STT_SECTION)
616 /* This relocation is relative to a section symbol that is
617 going to be merged. Change it so that it is relative
618 to the merged section symbol. */
619 rel->r_addend = _bfd_elf_rel_local_sym (output_bfd, sym, &sec,
620 rel->r_addend);
621
622 relocation = (sec->output_section->vma
623 + sec->output_offset
624 + sym->st_value);
625
626 name = bfd_elf_string_from_elf_section
627 (input_bfd, symtab_hdr->sh_link, sym->st_name);
628 name = name == NULL ? bfd_section_name (osec) : name;
629 }
630 else
631 {
632 bool unresolved_reloc;
633 bool warned, ignored;
634
635 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
636 r_symndx, symtab_hdr, sym_hashes,
637 h, sec, relocation,
638 unresolved_reloc, warned, ignored);
639
640 name = h->root.root.string;
641 }
642
643 if (sec != NULL && discarded_section (sec))
644 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
645 rel, 1, relend, howto, 0, contents);
646
647 if (bfd_link_relocatable (info))
648 continue;
649
650 switch (r_type)
651 {
652 case R_IQ2000_HI16:
653 r = iq2000_elf_relocate_hi16 (input_bfd, rel, contents, relocation);
654 break;
655
656 case R_IQ2000_OFFSET_16:
657 r = iq2000_elf_relocate_offset16 (input_bfd, rel, contents, relocation,
658 input_section->output_section->vma
659 + input_section->output_offset
660 + rel->r_offset);
661 break;
662
663 case R_IQ2000_PC16:
664 rel->r_addend -= 4;
665 /* Fall through. */
666
667 default:
668 r = iq2000_final_link_relocate (howto, input_bfd, input_section,
669 contents, rel, relocation);
670 break;
671 }
672
673 if (r != bfd_reloc_ok)
674 {
675 const char * msg = (const char *) NULL;
676
677 switch (r)
678 {
679 case bfd_reloc_overflow:
680 (*info->callbacks->reloc_overflow)
681 (info, (h ? &h->root : NULL), name, howto->name,
682 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
683 break;
684
685 case bfd_reloc_undefined:
686 (*info->callbacks->undefined_symbol)
687 (info, name, input_bfd, input_section, rel->r_offset, true);
688 break;
689
690 case bfd_reloc_outofrange:
691 msg = _("internal error: out of range error");
692 break;
693
694 case bfd_reloc_notsupported:
695 msg = _("internal error: unsupported relocation error");
696 break;
697
698 case bfd_reloc_dangerous:
699 msg = _("internal error: dangerous relocation");
700 break;
701
702 default:
703 msg = _("internal error: unknown error");
704 break;
705 }
706
707 if (msg)
708 (*info->callbacks->warning) (info, msg, name, input_bfd,
709 input_section, rel->r_offset);
710 }
711 }
712
713 return true;
714 }
715
716
717 /* Return the section that should be marked against GC for a given
718 relocation. */
719
720 static asection *
iq2000_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)721 iq2000_elf_gc_mark_hook (asection *sec,
722 struct bfd_link_info *info,
723 Elf_Internal_Rela *rel,
724 struct elf_link_hash_entry *h,
725 Elf_Internal_Sym *sym)
726 {
727 if (h != NULL)
728 switch (ELF32_R_TYPE (rel->r_info))
729 {
730 case R_IQ2000_GNU_VTINHERIT:
731 case R_IQ2000_GNU_VTENTRY:
732 return NULL;
733 }
734
735 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
736 }
737
738
739 /* Return the MACH for an e_flags value. */
740
741 static int
elf32_iq2000_machine(bfd * abfd)742 elf32_iq2000_machine (bfd *abfd)
743 {
744 switch (elf_elfheader (abfd)->e_flags & EF_IQ2000_CPU_MASK)
745 {
746 case EF_IQ2000_CPU_IQ10:
747 return bfd_mach_iq10;
748
749 case EF_IQ2000_CPU_IQ2000:
750 default:
751 return bfd_mach_iq2000;
752 }
753 }
754
755
756 /* Function to set the ELF flag bits. */
757
758 static bool
iq2000_elf_set_private_flags(bfd * abfd,flagword flags)759 iq2000_elf_set_private_flags (bfd *abfd, flagword flags)
760 {
761 elf_elfheader (abfd)->e_flags = flags;
762 elf_flags_init (abfd) = true;
763 return true;
764 }
765
766 /* Merge backend specific data from an object
767 file to the output object file when linking. */
768
769 static bool
iq2000_elf_merge_private_bfd_data(bfd * ibfd,struct bfd_link_info * info)770 iq2000_elf_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
771 {
772 bfd *obfd = info->output_bfd;
773 flagword old_flags, old_partial;
774 flagword new_flags, new_partial;
775 bool error = false;
776 char new_opt[80];
777 char old_opt[80];
778
779 new_opt[0] = old_opt[0] = '\0';
780 new_flags = elf_elfheader (ibfd)->e_flags;
781 old_flags = elf_elfheader (obfd)->e_flags;
782
783 if (!elf_flags_init (obfd))
784 {
785 /* First call, no flags set. */
786 elf_flags_init (obfd) = true;
787 elf_elfheader (obfd)->e_flags = new_flags;
788 }
789
790 else if (new_flags != old_flags)
791 {
792 /* Warn if different cpu is used, but allow a
793 specific cpu to override the generic cpu. */
794 new_partial = (new_flags & EF_IQ2000_CPU_MASK);
795 old_partial = (old_flags & EF_IQ2000_CPU_MASK);
796
797 if (new_partial != old_partial)
798 {
799 switch (new_partial)
800 {
801 case EF_IQ2000_CPU_IQ10:
802 strcat (new_opt, " -m10");
803 break;
804
805 default:
806 case EF_IQ2000_CPU_IQ2000:
807 strcat (new_opt, " -m2000");
808 break;
809 }
810
811 switch (old_partial)
812 {
813 case EF_IQ2000_CPU_IQ10:
814 strcat (old_opt, " -m10");
815 break;
816
817 default:
818 case EF_IQ2000_CPU_IQ2000:
819 strcat (old_opt, " -m2000");
820 break;
821 }
822 }
823
824 /* Print out any mismatches from above. */
825 if (new_opt[0])
826 {
827 error = true;
828 _bfd_error_handler
829 /* xgettext:c-format */
830 (_("%pB: compiled with %s and linked with modules compiled with %s"),
831 ibfd, new_opt, old_opt);
832 }
833
834 new_flags &= ~ EF_IQ2000_ALL_FLAGS;
835 old_flags &= ~ EF_IQ2000_ALL_FLAGS;
836
837 /* Warn about any other mismatches. */
838 if (new_flags != old_flags)
839 {
840 error = true;
841
842 _bfd_error_handler
843 /* xgettext:c-format */
844 (_("%pB: uses different e_flags (%#x) fields than previous modules (%#x)"),
845 ibfd, new_flags, old_flags);
846 }
847 }
848
849 if (error)
850 bfd_set_error (bfd_error_bad_value);
851
852 return !error;
853 }
854
855
856 static bool
iq2000_elf_print_private_bfd_data(bfd * abfd,void * ptr)857 iq2000_elf_print_private_bfd_data (bfd *abfd, void * ptr)
858 {
859 FILE *file = (FILE *) ptr;
860 flagword flags;
861
862 BFD_ASSERT (abfd != NULL && ptr != NULL);
863
864 /* Print normal ELF private data. */
865 _bfd_elf_print_private_bfd_data (abfd, ptr);
866
867 flags = elf_elfheader (abfd)->e_flags;
868 fprintf (file, _("private flags = 0x%lx:"), (unsigned long) flags);
869
870 switch (flags & EF_IQ2000_CPU_MASK)
871 {
872 case EF_IQ2000_CPU_IQ10:
873 fprintf (file, " -m10");
874 break;
875 case EF_IQ2000_CPU_IQ2000:
876 fprintf (file, " -m2000");
877 break;
878 default:
879 break;
880 }
881
882 fputc ('\n', file);
883 return true;
884 }
885
886 static
887 bool
iq2000_elf_object_p(bfd * abfd)888 iq2000_elf_object_p (bfd *abfd)
889 {
890 bfd_default_set_arch_mach (abfd, bfd_arch_iq2000,
891 elf32_iq2000_machine (abfd));
892 return true;
893 }
894
895
896 #define ELF_ARCH bfd_arch_iq2000
897 #define ELF_MACHINE_CODE EM_IQ2000
898 #define ELF_MAXPAGESIZE 0x1000
899
900 #define TARGET_BIG_SYM iq2000_elf32_vec
901 #define TARGET_BIG_NAME "elf32-iq2000"
902
903 #define elf_info_to_howto_rel NULL
904 #define elf_info_to_howto iq2000_info_to_howto_rela
905 #define elf_backend_relocate_section iq2000_elf_relocate_section
906 #define elf_backend_gc_mark_hook iq2000_elf_gc_mark_hook
907 #define elf_backend_check_relocs iq2000_elf_check_relocs
908 #define elf_backend_object_p iq2000_elf_object_p
909 #define elf_backend_rela_normal 1
910
911 #define elf_backend_can_gc_sections 1
912
913 #define bfd_elf32_bfd_reloc_type_lookup iq2000_reloc_type_lookup
914 #define bfd_elf32_bfd_reloc_name_lookup iq2000_reloc_name_lookup
915 #define bfd_elf32_bfd_set_private_flags iq2000_elf_set_private_flags
916 #define bfd_elf32_bfd_merge_private_bfd_data iq2000_elf_merge_private_bfd_data
917 #define bfd_elf32_bfd_print_private_bfd_data iq2000_elf_print_private_bfd_data
918
919 #include "elf32-target.h"
920