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[binutils.git] / bfd / elf32-iq2000.c
blob146dcaaecaf42a0d94719340dcc52e6e38da1e34
1 /* IQ2000-specific support for 32-bit ELF.
2 Copyright (C) 2003, 2004, 2005 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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
19
20 #include "bfd.h"
21 #include "sysdep.h"
22 #include "libbfd.h"
23 #include "elf-bfd.h"
24 #include "elf/iq2000.h"
25
26 /* Forward declarations. */
27
28 static bfd_reloc_status_type iq2000_elf_howto_hi16_reloc (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
29
30 \f
31 static reloc_howto_type iq2000_elf_howto_table [] =
32 {
33 /* This reloc does nothing. */
34
35 HOWTO (R_IQ2000_NONE, /* type */
36 0, /* rightshift */
37 2, /* size (0 = byte, 1 = short, 2 = long) */
38 32, /* bitsize */
39 FALSE, /* pc_relative */
40 0, /* bitpos */
41 complain_overflow_bitfield, /* complain_on_overflow */
42 bfd_elf_generic_reloc, /* special_function */
43 "R_IQ2000_NONE", /* name */
44 FALSE, /* partial_inplace */
45 0, /* src_mask */
46 0, /* dst_mask */
47 FALSE), /* pcrel_offset */
48
49 /* A 16 bit absolute relocation. */
50 HOWTO (R_IQ2000_16, /* type */
51 0, /* rightshift */
52 1, /* size (0 = byte, 1 = short, 2 = long) */
53 16, /* bitsize */
54 FALSE, /* pc_relative */
55 0, /* bitpos */
56 complain_overflow_bitfield, /* complain_on_overflow */
57 bfd_elf_generic_reloc, /* special_function */
58 "R_IQ2000_16", /* name */
59 FALSE, /* partial_inplace */
60 0x0000, /* src_mask */
61 0xffff, /* dst_mask */
62 FALSE), /* pcrel_offset */
63
64 /* A 32 bit absolute relocation. */
65 HOWTO (R_IQ2000_32, /* type */
66 0, /* rightshift */
67 2, /* size (0 = byte, 1 = short, 2 = long) */
68 31, /* bitsize */
69 FALSE, /* pc_relative */
70 0, /* bitpos */
71 complain_overflow_bitfield, /* complain_on_overflow */
72 bfd_elf_generic_reloc, /* special_function */
73 "R_IQ2000_32", /* name */
74 FALSE, /* partial_inplace */
75 0x00000000, /* src_mask */
76 0x7fffffff, /* dst_mask */
77 FALSE), /* pcrel_offset */
78
79 /* 26 bit branch address. */
80 HOWTO (R_IQ2000_26, /* type */
81 2, /* rightshift */
82 2, /* size (0 = byte, 1 = short, 2 = long) */
83 26, /* bitsize */
84 FALSE, /* pc_relative */
85 0, /* bitpos */
86 complain_overflow_dont, /* complain_on_overflow */
87 /* This needs complex overflow
88 detection, because the upper four
89 bits must match the PC. */
90 bfd_elf_generic_reloc, /* special_function */
91 "R_IQ2000_26", /* name */
92 FALSE, /* partial_inplace */
93 0x00000000, /* src_mask */
94 0x03ffffff, /* dst_mask */
95 FALSE), /* pcrel_offset */
96
97 /* 16 bit PC relative reference. */
98 HOWTO (R_IQ2000_PC16, /* type */
99 2, /* rightshift */
100 2, /* size (0 = byte, 1 = short, 2 = long) */
101 16, /* bitsize */
102 TRUE, /* pc_relative */
103 0, /* bitpos */
104 complain_overflow_signed, /* complain_on_overflow */
105 bfd_elf_generic_reloc, /* special_function */
106 "R_IQ2000_PC16", /* name */
107 FALSE, /* partial_inplace */
108 0x0000, /* src_mask */
109 0xffff, /* dst_mask */
110 TRUE), /* pcrel_offset */
111
112 /* high 16 bits of symbol value. */
113 HOWTO (R_IQ2000_HI16, /* type */
114 16, /* rightshift */
115 2, /* size (0 = byte, 1 = short, 2 = long) */
116 15, /* bitsize */
117 FALSE, /* pc_relative */
118 0, /* bitpos */
119 complain_overflow_dont, /* complain_on_overflow */
120 iq2000_elf_howto_hi16_reloc, /* special_function */
121 "R_IQ2000_HI16", /* name */
122 FALSE, /* partial_inplace */
123 0x0000, /* src_mask */
124 0x7fff, /* dst_mask */
125 FALSE), /* pcrel_offset */
126
127 /* Low 16 bits of symbol value. */
128 HOWTO (R_IQ2000_LO16, /* type */
129 0, /* rightshift */
130 2, /* size (0 = byte, 1 = short, 2 = long) */
131 16, /* bitsize */
132 FALSE, /* pc_relative */
133 0, /* bitpos */
134 complain_overflow_dont, /* complain_on_overflow */
135 bfd_elf_generic_reloc, /* special_function */
136 "R_IQ2000_LO16", /* name */
137 FALSE, /* partial_inplace */
138 0x0000, /* src_mask */
139 0xffff, /* dst_mask */
140 FALSE), /* pcrel_offset */
141
142 /* 16-bit jump offset. */
143 HOWTO (R_IQ2000_OFFSET_16, /* type */
144 2, /* rightshift */
145 2, /* size (0 = byte, 1 = short, 2 = long) */
146 16, /* bitsize */
147 FALSE, /* pc_relative */
148 0, /* bitpos */
149 complain_overflow_dont, /* complain_on_overflow */
150 bfd_elf_generic_reloc, /* special_function */
151 "R_IQ2000_OFFSET_16", /* name */
152 FALSE, /* partial_inplace */
153 0x0000, /* src_mask */
154 0xffff, /* dst_mask */
155 FALSE), /* pcrel_offset */
156
157 /* 21-bit jump offset. */
158 HOWTO (R_IQ2000_OFFSET_21, /* type */
159 2, /* rightshift */
160 2, /* size (0 = byte, 1 = short, 2 = long) */
161 21, /* bitsize */
162 FALSE, /* pc_relative */
163 0, /* bitpos */
164 complain_overflow_dont, /* complain_on_overflow */
165 bfd_elf_generic_reloc, /* special_function */
166 "R_IQ2000_OFFSET_21", /* name */
167 FALSE, /* partial_inplace */
168 0x000000, /* src_mask */
169 0x1fffff, /* dst_mask */
170 FALSE), /* pcrel_offset */
171
172 /* unsigned high 16 bits of value. */
173 HOWTO (R_IQ2000_OFFSET_21, /* type */
174 16, /* rightshift */
175 2, /* size (0 = byte, 1 = short, 2 = long) */
176 16, /* bitsize */
177 FALSE, /* pc_relative */
178 0, /* bitpos */
179 complain_overflow_dont, /* complain_on_overflow */
180 bfd_elf_generic_reloc, /* special_function */
181 "R_IQ2000_UHI16", /* name */
182 FALSE, /* partial_inplace */
183 0x0000, /* src_mask */
184 0x7fff, /* dst_mask */
185 FALSE), /* pcrel_offset */
186
187 /* A 32 bit absolute debug relocation. */
188 HOWTO (R_IQ2000_32_DEBUG, /* type */
189 0, /* rightshift */
190 2, /* size (0 = byte, 1 = short, 2 = long) */
191 32, /* bitsize */
192 FALSE, /* pc_relative */
193 0, /* bitpos */
194 complain_overflow_bitfield, /* complain_on_overflow */
195 bfd_elf_generic_reloc, /* special_function */
196 "R_IQ2000_32", /* name */
197 FALSE, /* partial_inplace */
198 0x00000000, /* src_mask */
199 0xffffffff, /* dst_mask */
200 FALSE), /* pcrel_offset */
201
202 };
203
204 /* GNU extension to record C++ vtable hierarchy. */
205 static reloc_howto_type iq2000_elf_vtinherit_howto =
206 HOWTO (R_IQ2000_GNU_VTINHERIT, /* type */
207 0, /* rightshift */
208 2, /* size (0 = byte, 1 = short, 2 = long) */
209 0, /* bitsize */
210 FALSE, /* pc_relative */
211 0, /* bitpos */
212 complain_overflow_dont, /* complain_on_overflow */
213 NULL, /* special_function */
214 "R_IQ2000_GNU_VTINHERIT", /* name */
215 FALSE, /* partial_inplace */
216 0, /* src_mask */
217 0, /* dst_mask */
218 FALSE); /* pcrel_offset */
219
220 /* GNU extension to record C++ vtable member usage. */
221 static reloc_howto_type iq2000_elf_vtentry_howto =
222 HOWTO (R_IQ2000_GNU_VTENTRY, /* type */
223 0, /* rightshift */
224 2, /* size (0 = byte, 1 = short, 2 = long) */
225 0, /* bitsize */
226 FALSE, /* pc_relative */
227 0, /* bitpos */
228 complain_overflow_dont, /* complain_on_overflow */
229 NULL, /* special_function */
230 "R_IQ2000_GNU_VTENTRY", /* name */
231 FALSE, /* partial_inplace */
232 0, /* src_mask */
233 0, /* dst_mask */
234 FALSE); /* pcrel_offset */
235
236 \f
237 static bfd_reloc_status_type
238 iq2000_elf_howto_hi16_reloc (bfd *abfd ATTRIBUTE_UNUSED,
239 arelent *reloc_entry,
240 asymbol *symbol,
241 void * data,
242 asection *input_section,
243 bfd *output_bfd,
244 char **error_message ATTRIBUTE_UNUSED)
245 {
246 bfd_reloc_status_type ret;
247 bfd_vma relocation;
248
249 /* If we're relocating and this an external symbol,
250 we don't want to change anything. */
251 if (output_bfd != (bfd *) NULL
252 && (symbol->flags & BSF_SECTION_SYM) == 0
253 && reloc_entry->addend == 0)
254 {
255 reloc_entry->address += input_section->output_offset;
256 return bfd_reloc_ok;
257 }
258
259 if (bfd_is_com_section (symbol->section))
260 relocation = 0;
261 else
262 relocation = symbol->value;
263
264 relocation += symbol->section->output_section->vma;
265 relocation += symbol->section->output_offset;
266 relocation += reloc_entry->addend;
267
268 /* If %lo will have sign-extension, compensate by add 0x10000 to hi portion. */
269 if (relocation & 0x8000)
270 reloc_entry->addend += 0x10000;
271
272 /* Now do the reloc in the usual way. */
273 ret = bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
274 input_section, output_bfd, error_message);
275
276 /* Put it back the way it was. */
277 if (relocation & 0x8000)
278 reloc_entry->addend -= 0x10000;
279
280 return ret;
281 }
282
283 static bfd_reloc_status_type
284 iq2000_elf_relocate_hi16 (bfd *input_bfd,
285 Elf_Internal_Rela *relhi,
286 bfd_byte *contents,
287 bfd_vma value)
288 {
289 bfd_vma insn;
290
291 insn = bfd_get_32 (input_bfd, contents + relhi->r_offset);
292
293 value += relhi->r_addend;
294 value &= 0x7fffffff; /* Mask off top-bit which is Harvard mask bit. */
295
296 /* If top-bit of %lo value is on, this means that %lo will
297 sign-propagate and so we compensate by adding 1 to %hi value. */
298 if (value & 0x8000)
299 value += 0x10000;
300
301 value >>= 16;
302 insn = ((insn & ~0xFFFF) | value);
303
304 bfd_put_32 (input_bfd, insn, contents + relhi->r_offset);
305 return bfd_reloc_ok;
306 }
307
308 /* Map BFD reloc types to IQ2000 ELF reloc types. */
309
310 static reloc_howto_type *
311 iq2000_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
312 bfd_reloc_code_real_type code)
313 {
314 /* Note that the iq2000_elf_howto_table is indxed by the R_
315 constants. Thus, the order that the howto records appear in the
316 table *must* match the order of the relocation types defined in
317 include/elf/iq2000.h. */
318
319 switch (code)
320 {
321 case BFD_RELOC_NONE:
322 return &iq2000_elf_howto_table[ (int) R_IQ2000_NONE];
323 case BFD_RELOC_16:
324 return &iq2000_elf_howto_table[ (int) R_IQ2000_16];
325 case BFD_RELOC_32:
326 return &iq2000_elf_howto_table[ (int) R_IQ2000_32];
327 case BFD_RELOC_MIPS_JMP:
328 return &iq2000_elf_howto_table[ (int) R_IQ2000_26];
329 case BFD_RELOC_IQ2000_OFFSET_16:
330 return &iq2000_elf_howto_table[ (int) R_IQ2000_OFFSET_16];
331 case BFD_RELOC_IQ2000_OFFSET_21:
332 return &iq2000_elf_howto_table[ (int) R_IQ2000_OFFSET_21];
333 case BFD_RELOC_16_PCREL_S2:
334 return &iq2000_elf_howto_table[ (int) R_IQ2000_PC16];
335 case BFD_RELOC_HI16:
336 return &iq2000_elf_howto_table[ (int) R_IQ2000_HI16];
337 case BFD_RELOC_IQ2000_UHI16:
338 return &iq2000_elf_howto_table[ (int) R_IQ2000_UHI16];
339 case BFD_RELOC_LO16:
340 return &iq2000_elf_howto_table[ (int) R_IQ2000_LO16];
341 case BFD_RELOC_VTABLE_INHERIT:
342 return &iq2000_elf_vtinherit_howto;
343 case BFD_RELOC_VTABLE_ENTRY:
344 return &iq2000_elf_vtentry_howto;
345 default:
346 /* Pacify gcc -Wall. */
347 return NULL;
348 }
349 return NULL;
350 }
351
352 \f
353 /* Perform a single relocation. By default we use the standard BFD
354 routines. */
355
356 static bfd_reloc_status_type
357 iq2000_final_link_relocate (reloc_howto_type * howto,
358 bfd * input_bfd,
359 asection * input_section,
360 bfd_byte * contents,
361 Elf_Internal_Rela * rel,
362 bfd_vma relocation)
363 {
364 return _bfd_final_link_relocate (howto, input_bfd, input_section,
365 contents, rel->r_offset,
366 relocation, rel->r_addend);
367 }
368 \f
369 /* Set the howto pointer for a IQ2000 ELF reloc. */
370
371 static void
372 iq2000_info_to_howto_rela (bfd * abfd ATTRIBUTE_UNUSED,
373 arelent * cache_ptr,
374 Elf_Internal_Rela * dst)
375 {
376 unsigned int r_type;
377
378 r_type = ELF32_R_TYPE (dst->r_info);
379 switch (r_type)
380 {
381 case R_IQ2000_GNU_VTINHERIT:
382 cache_ptr->howto = & iq2000_elf_vtinherit_howto;
383 break;
384
385 case R_IQ2000_GNU_VTENTRY:
386 cache_ptr->howto = & iq2000_elf_vtentry_howto;
387 break;
388
389 default:
390 cache_ptr->howto = & iq2000_elf_howto_table [r_type];
391 break;
392 }
393 }
394
395 /* Look through the relocs for a section during the first phase.
396 Since we don't do .gots or .plts, we just need to consider the
397 virtual table relocs for gc. */
398
399 static bfd_boolean
400 iq2000_elf_check_relocs (bfd *abfd,
401 struct bfd_link_info *info,
402 asection *sec,
403 const Elf_Internal_Rela *relocs)
404 {
405 Elf_Internal_Shdr *symtab_hdr;
406 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
407 const Elf_Internal_Rela *rel;
408 const Elf_Internal_Rela *rel_end;
409 bfd_boolean changed = FALSE;
410
411 if (info->relocatable)
412 return TRUE;
413
414 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
415 sym_hashes = elf_sym_hashes (abfd);
416 sym_hashes_end = sym_hashes + symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
417 if (!elf_bad_symtab (abfd))
418 sym_hashes_end -= symtab_hdr->sh_info;
419
420 rel_end = relocs + sec->reloc_count;
421 for (rel = relocs; rel < rel_end; rel++)
422 {
423 struct elf_link_hash_entry *h;
424 unsigned long r_symndx;
425
426 r_symndx = ELF32_R_SYM (rel->r_info);
427 if (r_symndx < symtab_hdr->sh_info)
428 h = NULL;
429 else
430 {
431 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
432 while (h->root.type == bfd_link_hash_indirect
433 || h->root.type == bfd_link_hash_warning)
434 h = (struct elf_link_hash_entry *) h->root.u.i.link;
435 }
436
437 switch (ELF32_R_TYPE (rel->r_info))
438 {
439 /* This relocation describes the C++ object vtable
440 hierarchy. Reconstruct it for later use during GC. */
441 case R_IQ2000_GNU_VTINHERIT:
442 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
443 return FALSE;
444 break;
445
446 /* This relocation describes which C++ vtable entries
447 are actually used. Record for later use during GC. */
448 case R_IQ2000_GNU_VTENTRY:
449 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
450 return FALSE;
451 break;
452
453 case R_IQ2000_32:
454 /* For debug section, change to special harvard-aware relocations. */
455 if (memcmp (sec->name, ".debug", 6) == 0
456 || memcmp (sec->name, ".stab", 5) == 0
457 || memcmp (sec->name, ".eh_frame", 9) == 0)
458 {
459 ((Elf_Internal_Rela *) rel)->r_info
460 = ELF32_R_INFO (ELF32_R_SYM (rel->r_info), R_IQ2000_32_DEBUG);
461 changed = TRUE;
462 }
463 break;
464 }
465 }
466
467 if (changed)
468 /* Note that we've changed relocs, otherwise if !info->keep_memory
469 we'll free the relocs and lose our changes. */
470 elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs;
471
472 return TRUE;
473 }
474
475 \f
476 /* Relocate a IQ2000 ELF section.
477 There is some attempt to make this function usable for many architectures,
478 both USE_REL and USE_RELA ['twould be nice if such a critter existed],
479 if only to serve as a learning tool.
480
481 The RELOCATE_SECTION function is called by the new ELF backend linker
482 to handle the relocations for a section.
483
484 The relocs are always passed as Rela structures; if the section
485 actually uses Rel structures, the r_addend field will always be
486 zero.
487
488 This function is responsible for adjusting the section contents as
489 necessary, and (if using Rela relocs and generating a relocatable
490 output file) adjusting the reloc addend as necessary.
491
492 This function does not have to worry about setting the reloc
493 address or the reloc symbol index.
494
495 LOCAL_SYMS is a pointer to the swapped in local symbols.
496
497 LOCAL_SECTIONS is an array giving the section in the input file
498 corresponding to the st_shndx field of each local symbol.
499
500 The global hash table entry for the global symbols can be found
501 via elf_sym_hashes (input_bfd).
502
503 When generating relocatable output, this function must handle
504 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
505 going to be the section symbol corresponding to the output
506 section, which means that the addend must be adjusted
507 accordingly. */
508
509 static bfd_boolean
510 iq2000_elf_relocate_section (bfd * output_bfd ATTRIBUTE_UNUSED,
511 struct bfd_link_info * info,
512 bfd * input_bfd,
513 asection * input_section,
514 bfd_byte * contents,
515 Elf_Internal_Rela * relocs,
516 Elf_Internal_Sym * local_syms,
517 asection ** local_sections)
518 {
519 Elf_Internal_Shdr * symtab_hdr;
520 struct elf_link_hash_entry ** sym_hashes;
521 Elf_Internal_Rela * rel;
522 Elf_Internal_Rela * relend;
523
524 if (info->relocatable)
525 return TRUE;
526
527 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
528 sym_hashes = elf_sym_hashes (input_bfd);
529 relend = relocs + input_section->reloc_count;
530
531 for (rel = relocs; rel < relend; rel ++)
532 {
533 reloc_howto_type * howto;
534 unsigned long r_symndx;
535 Elf_Internal_Sym * sym;
536 asection * sec;
537 struct elf_link_hash_entry * h;
538 bfd_vma relocation;
539 bfd_reloc_status_type r;
540 const char * name = NULL;
541 int r_type;
542
543 r_type = ELF32_R_TYPE (rel->r_info);
544
545 if ( r_type == R_IQ2000_GNU_VTINHERIT
546 || r_type == R_IQ2000_GNU_VTENTRY)
547 continue;
548
549 r_symndx = ELF32_R_SYM (rel->r_info);
550
551 /* This is a final link. */
552 howto = iq2000_elf_howto_table + ELF32_R_TYPE (rel->r_info);
553 h = NULL;
554 sym = NULL;
555 sec = NULL;
556
557 if (r_symndx < symtab_hdr->sh_info)
558 {
559 sym = local_syms + r_symndx;
560 sec = local_sections [r_symndx];
561 relocation = (sec->output_section->vma
562 + sec->output_offset
563 + sym->st_value);
564
565 name = bfd_elf_string_from_elf_section
566 (input_bfd, symtab_hdr->sh_link, sym->st_name);
567 name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
568 }
569 else
570 {
571 bfd_boolean unresolved_reloc;
572 bfd_boolean warned;
573
574 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
575 r_symndx, symtab_hdr, sym_hashes,
576 h, sec, relocation,
577 unresolved_reloc, warned);
578
579 name = h->root.root.string;
580 }
581
582 switch (r_type)
583 {
584 case R_IQ2000_HI16:
585 r = iq2000_elf_relocate_hi16 (input_bfd, rel, contents, relocation);
586 break;
587
588 case R_IQ2000_PC16:
589 rel->r_addend -= 4;
590 /* Fall through. */
591
592 default:
593 r = iq2000_final_link_relocate (howto, input_bfd, input_section,
594 contents, rel, relocation);
595 break;
596 }
597
598 if (r != bfd_reloc_ok)
599 {
600 const char * msg = (const char *) NULL;
601
602 switch (r)
603 {
604 case bfd_reloc_overflow:
605 r = info->callbacks->reloc_overflow
606 (info, (h ? &h->root : NULL), name, howto->name,
607 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
608 break;
609
610 case bfd_reloc_undefined:
611 r = info->callbacks->undefined_symbol
612 (info, name, input_bfd, input_section, rel->r_offset, TRUE);
613 break;
614
615 case bfd_reloc_outofrange:
616 msg = _("internal error: out of range error");
617 break;
618
619 case bfd_reloc_notsupported:
620 msg = _("internal error: unsupported relocation error");
621 break;
622
623 case bfd_reloc_dangerous:
624 msg = _("internal error: dangerous relocation");
625 break;
626
627 default:
628 msg = _("internal error: unknown error");
629 break;
630 }
631
632 if (msg)
633 r = info->callbacks->warning
634 (info, msg, name, input_bfd, input_section, rel->r_offset);
635
636 if (! r)
637 return FALSE;
638 }
639 }
640
641 return TRUE;
642 }
643 \f
644
645 /* Update the got entry reference counts for the section being
646 removed. */
647
648 static bfd_boolean
649 iq2000_elf_gc_sweep_hook (bfd * abfd ATTRIBUTE_UNUSED,
650 struct bfd_link_info * info ATTRIBUTE_UNUSED,
651 asection * sec ATTRIBUTE_UNUSED,
652 const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED)
653 {
654 return TRUE;
655 }
656
657 /* Return the section that should be marked against GC for a given
658 relocation. */
659
660 static asection *
661 iq2000_elf_gc_mark_hook (asection * sec,
662 struct bfd_link_info * info ATTRIBUTE_UNUSED,
663 Elf_Internal_Rela * rel,
664 struct elf_link_hash_entry * h,
665 Elf_Internal_Sym * sym)
666 {
667 if (h == NULL)
668 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
669
670 switch (ELF32_R_TYPE (rel->r_info))
671 {
672 case R_IQ2000_GNU_VTINHERIT:
673 case R_IQ2000_GNU_VTENTRY:
674 break;
675
676 default:
677 switch (h->root.type)
678 {
679 case bfd_link_hash_defined:
680 case bfd_link_hash_defweak:
681 return h->root.u.def.section;
682
683 case bfd_link_hash_common:
684 return h->root.u.c.p->section;
685
686 default:
687 break;
688 }
689 }
690
691 return NULL;
692 }
693
694 \f
695 /* Return the MACH for an e_flags value. */
696
697 static int
698 elf32_iq2000_machine (bfd *abfd)
699 {
700 switch (elf_elfheader (abfd)->e_flags & EF_IQ2000_CPU_MASK)
701 {
702 case EF_IQ2000_CPU_IQ10:
703 return bfd_mach_iq10;
704
705 case EF_IQ2000_CPU_IQ2000:
706 default:
707 return bfd_mach_iq2000;
708 }
709 }
710
711 \f
712 /* Function to set the ELF flag bits. */
713
714 static bfd_boolean
715 iq2000_elf_set_private_flags (bfd *abfd, flagword flags)
716 {
717 elf_elfheader (abfd)->e_flags = flags;
718 elf_flags_init (abfd) = TRUE;
719 return TRUE;
720 }
721
722 /* Copy backend specific data from one object module to another. */
723
724 static bfd_boolean
725 iq2000_elf_copy_private_bfd_data (bfd *ibfd, bfd *obfd)
726 {
727 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
728 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
729 return TRUE;
730
731 BFD_ASSERT (!elf_flags_init (obfd)
732 || elf_elfheader (obfd)->e_flags == elf_elfheader (ibfd)->e_flags);
733
734 elf_elfheader (obfd)->e_flags = elf_elfheader (ibfd)->e_flags;
735 elf_flags_init (obfd) = TRUE;
736 return TRUE;
737 }
738
739 /* Merge backend specific data from an object
740 file to the output object file when linking. */
741
742 static bfd_boolean
743 iq2000_elf_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
744 {
745 flagword old_flags, old_partial;
746 flagword new_flags, new_partial;
747 bfd_boolean error = FALSE;
748 char new_opt[80];
749 char old_opt[80];
750
751 new_opt[0] = old_opt[0] = '\0';
752 new_flags = elf_elfheader (ibfd)->e_flags;
753 old_flags = elf_elfheader (obfd)->e_flags;
754
755 if (!elf_flags_init (obfd))
756 {
757 /* First call, no flags set. */
758 elf_flags_init (obfd) = TRUE;
759 elf_elfheader (obfd)->e_flags = new_flags;
760 }
761
762 else if (new_flags != old_flags)
763 {
764 /* Warn if different cpu is used, but allow a
765 specific cpu to override the generic cpu. */
766 new_partial = (new_flags & EF_IQ2000_CPU_MASK);
767 old_partial = (old_flags & EF_IQ2000_CPU_MASK);
768
769 if (new_partial != old_partial)
770 {
771 switch (new_partial)
772 {
773 case EF_IQ2000_CPU_IQ10:
774 strcat (new_opt, " -m10");
775 break;
776
777 default:
778 case EF_IQ2000_CPU_IQ2000:
779 strcat (new_opt, " -m2000");
780 break;
781 }
782
783 switch (old_partial)
784 {
785 case EF_IQ2000_CPU_IQ10:
786 strcat (old_opt, " -m10");
787 break;
788
789 default:
790 case EF_IQ2000_CPU_IQ2000:
791 strcat (old_opt, " -m2000");
792 break;
793 }
794 }
795
796 /* Print out any mismatches from above. */
797 if (new_opt[0])
798 {
799 error = TRUE;
800 _bfd_error_handler
801 (_("%s: compiled with %s and linked with modules compiled with %s"),
802 bfd_get_filename (ibfd), new_opt, old_opt);
803 }
804
805 new_flags &= ~ EF_IQ2000_ALL_FLAGS;
806 old_flags &= ~ EF_IQ2000_ALL_FLAGS;
807
808 /* Warn about any other mismatches. */
809 if (new_flags != old_flags)
810 {
811 error = TRUE;
812
813 _bfd_error_handler
814 (_("%s: uses different e_flags (0x%lx) fields than previous modules (0x%lx)"),
815 bfd_get_filename (ibfd), (long)new_flags, (long)old_flags);
816 }
817 }
818
819 if (error)
820 bfd_set_error (bfd_error_bad_value);
821
822 return !error;
823 }
824
825 \f
826 static bfd_boolean
827 iq2000_elf_print_private_bfd_data (bfd *abfd, void * ptr)
828 {
829 FILE *file = (FILE *) ptr;
830 flagword flags;
831
832 BFD_ASSERT (abfd != NULL && ptr != NULL);
833
834 /* Print normal ELF private data. */
835 _bfd_elf_print_private_bfd_data (abfd, ptr);
836
837 flags = elf_elfheader (abfd)->e_flags;
838 fprintf (file, _("private flags = 0x%lx:"), (long)flags);
839
840 switch (flags & EF_IQ2000_CPU_MASK)
841 {
842 case EF_IQ2000_CPU_IQ10:
843 fprintf (file, " -m10");
844 break;
845 case EF_IQ2000_CPU_IQ2000:
846 fprintf (file, " -m2000");
847 break;
848 default:
849 break;
850 }
851
852 fputc ('\n', file);
853 return TRUE;
854 }
855
856 static
857 bfd_boolean
858 iq2000_elf_object_p (bfd *abfd)
859 {
860 bfd_default_set_arch_mach (abfd, bfd_arch_iq2000,
861 elf32_iq2000_machine (abfd));
862 return TRUE;
863 }
864
865 \f
866 #define ELF_ARCH bfd_arch_iq2000
867 #define ELF_MACHINE_CODE EM_IQ2000
868 #define ELF_MAXPAGESIZE 0x1000
869
870 #define TARGET_BIG_SYM bfd_elf32_iq2000_vec
871 #define TARGET_BIG_NAME "elf32-iq2000"
872
873 #define elf_info_to_howto_rel NULL
874 #define elf_info_to_howto iq2000_info_to_howto_rela
875 #define elf_backend_relocate_section iq2000_elf_relocate_section
876 #define elf_backend_gc_mark_hook iq2000_elf_gc_mark_hook
877 #define elf_backend_gc_sweep_hook iq2000_elf_gc_sweep_hook
878 #define elf_backend_check_relocs iq2000_elf_check_relocs
879 #define elf_backend_object_p iq2000_elf_object_p
880 #define elf_backend_rela_normal 1
881
882 #define elf_backend_can_gc_sections 1
883
884 #define bfd_elf32_bfd_reloc_type_lookup iq2000_reloc_type_lookup
885 #define bfd_elf32_bfd_set_private_flags iq2000_elf_set_private_flags
886 #define bfd_elf32_bfd_copy_private_bfd_data iq2000_elf_copy_private_bfd_data
887 #define bfd_elf32_bfd_merge_private_bfd_data iq2000_elf_merge_private_bfd_data
888 #define bfd_elf32_bfd_print_private_bfd_data iq2000_elf_print_private_bfd_data
889
890 #include "elf32-target.h"
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