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2012-03-08 Andreas Krebbel <Andreas.Krebbel@de.ibm.com>
[deliverable/binutils-gdb.git] / bfd / elf32-iq2000.c
1 /* IQ2000-specific support for 32-bit ELF.
2 Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008
3 Free Software Foundation, Inc.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 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/iq2000.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 \f
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 2, /* size (0 = byte, 1 = short, 2 = long) */
39 32, /* bitsize */
40 FALSE, /* pc_relative */
41 0, /* bitpos */
42 complain_overflow_bitfield, /* 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 1, /* size (0 = byte, 1 = short, 2 = long) */
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 2, /* size (0 = byte, 1 = short, 2 = long) */
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 2, /* size (0 = byte, 1 = short, 2 = long) */
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 2, /* size (0 = byte, 1 = short, 2 = long) */
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 2, /* size (0 = byte, 1 = short, 2 = long) */
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 2, /* size (0 = byte, 1 = short, 2 = long) */
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 2, /* size (0 = byte, 1 = short, 2 = long) */
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 2, /* size (0 = byte, 1 = short, 2 = long) */
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 2, /* size (0 = byte, 1 = short, 2 = long) */
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 2, /* size (0 = byte, 1 = short, 2 = long) */
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 2, /* size (0 = byte, 1 = short, 2 = long) */
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 2, /* size (0 = byte, 1 = short, 2 = long) */
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 \f
238 static bfd_reloc_status_type
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
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
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 *
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 *
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 \f
402 /* Perform a single relocation. By default we use the standard BFD
403 routines. */
404
405 static bfd_reloc_status_type
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 \f
418 /* Set the howto pointer for a IQ2000 ELF reloc. */
419
420 static void
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 cache_ptr->howto = & iq2000_elf_howto_table [r_type];
440 break;
441 }
442 }
443
444 /* Look through the relocs for a section during the first phase.
445 Since we don't do .gots or .plts, we just need to consider the
446 virtual table relocs for gc. */
447
448 static bfd_boolean
449 iq2000_elf_check_relocs (bfd *abfd,
450 struct bfd_link_info *info,
451 asection *sec,
452 const Elf_Internal_Rela *relocs)
453 {
454 Elf_Internal_Shdr *symtab_hdr;
455 struct elf_link_hash_entry **sym_hashes;
456 const Elf_Internal_Rela *rel;
457 const Elf_Internal_Rela *rel_end;
458 bfd_boolean changed = FALSE;
459
460 if (info->relocatable)
461 return TRUE;
462
463 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
464 sym_hashes = elf_sym_hashes (abfd);
465
466 rel_end = relocs + sec->reloc_count;
467 for (rel = relocs; rel < rel_end; rel++)
468 {
469 struct elf_link_hash_entry *h;
470 unsigned long r_symndx;
471
472 r_symndx = ELF32_R_SYM (rel->r_info);
473 if (r_symndx < symtab_hdr->sh_info)
474 h = NULL;
475 else
476 {
477 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
478 while (h->root.type == bfd_link_hash_indirect
479 || h->root.type == bfd_link_hash_warning)
480 h = (struct elf_link_hash_entry *) h->root.u.i.link;
481 }
482
483 switch (ELF32_R_TYPE (rel->r_info))
484 {
485 /* This relocation describes the C++ object vtable
486 hierarchy. Reconstruct it for later use during GC. */
487 case R_IQ2000_GNU_VTINHERIT:
488 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
489 return FALSE;
490 break;
491
492 /* This relocation describes which C++ vtable entries
493 are actually used. Record for later use during GC. */
494 case R_IQ2000_GNU_VTENTRY:
495 BFD_ASSERT (h != NULL);
496 if (h != NULL
497 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
498 return FALSE;
499 break;
500
501 case R_IQ2000_32:
502 /* For debug section, change to special harvard-aware relocations. */
503 if (CONST_STRNEQ (sec->name, ".debug")
504 || CONST_STRNEQ (sec->name, ".stab")
505 || CONST_STRNEQ (sec->name, ".eh_frame"))
506 {
507 ((Elf_Internal_Rela *) rel)->r_info
508 = ELF32_R_INFO (ELF32_R_SYM (rel->r_info), R_IQ2000_32_DEBUG);
509 changed = TRUE;
510 }
511 break;
512 }
513 }
514
515 if (changed)
516 /* Note that we've changed relocs, otherwise if !info->keep_memory
517 we'll free the relocs and lose our changes. */
518 elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs;
519
520 return TRUE;
521 }
522
523 \f
524 /* Relocate a IQ2000 ELF section.
525 There is some attempt to make this function usable for many architectures,
526 both USE_REL and USE_RELA ['twould be nice if such a critter existed],
527 if only to serve as a learning tool.
528
529 The RELOCATE_SECTION function is called by the new ELF backend linker
530 to handle the relocations for a section.
531
532 The relocs are always passed as Rela structures; if the section
533 actually uses Rel structures, the r_addend field will always be
534 zero.
535
536 This function is responsible for adjusting the section contents as
537 necessary, and (if using Rela relocs and generating a relocatable
538 output file) adjusting the reloc addend as necessary.
539
540 This function does not have to worry about setting the reloc
541 address or the reloc symbol index.
542
543 LOCAL_SYMS is a pointer to the swapped in local symbols.
544
545 LOCAL_SECTIONS is an array giving the section in the input file
546 corresponding to the st_shndx field of each local symbol.
547
548 The global hash table entry for the global symbols can be found
549 via elf_sym_hashes (input_bfd).
550
551 When generating relocatable output, this function must handle
552 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
553 going to be the section symbol corresponding to the output
554 section, which means that the addend must be adjusted
555 accordingly. */
556
557 static bfd_boolean
558 iq2000_elf_relocate_section (bfd * output_bfd ATTRIBUTE_UNUSED,
559 struct bfd_link_info * info,
560 bfd * input_bfd,
561 asection * input_section,
562 bfd_byte * contents,
563 Elf_Internal_Rela * relocs,
564 Elf_Internal_Sym * local_syms,
565 asection ** local_sections)
566 {
567 Elf_Internal_Shdr * symtab_hdr;
568 struct elf_link_hash_entry ** sym_hashes;
569 Elf_Internal_Rela * rel;
570 Elf_Internal_Rela * relend;
571
572 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
573 sym_hashes = elf_sym_hashes (input_bfd);
574 relend = relocs + input_section->reloc_count;
575
576 for (rel = relocs; rel < relend; rel ++)
577 {
578 reloc_howto_type * howto;
579 unsigned long r_symndx;
580 Elf_Internal_Sym * sym;
581 asection * sec;
582 struct elf_link_hash_entry * h;
583 bfd_vma relocation;
584 bfd_reloc_status_type r;
585 const char * name = NULL;
586 int r_type;
587
588 r_type = ELF32_R_TYPE (rel->r_info);
589
590 if ( r_type == R_IQ2000_GNU_VTINHERIT
591 || r_type == R_IQ2000_GNU_VTENTRY)
592 continue;
593
594 r_symndx = ELF32_R_SYM (rel->r_info);
595
596 howto = iq2000_elf_howto_table + ELF32_R_TYPE (rel->r_info);
597 h = NULL;
598 sym = NULL;
599 sec = NULL;
600
601 if (r_symndx < symtab_hdr->sh_info)
602 {
603 asection *osec;
604
605 sym = local_syms + r_symndx;
606 osec = sec = local_sections [r_symndx];
607 if ((sec->flags & SEC_MERGE)
608 && ELF_ST_TYPE (sym->st_info) == STT_SECTION)
609 /* This relocation is relative to a section symbol that is
610 going to be merged. Change it so that it is relative
611 to the merged section symbol. */
612 rel->r_addend = _bfd_elf_rel_local_sym (output_bfd, sym, &sec,
613 rel->r_addend);
614
615 relocation = (sec->output_section->vma
616 + sec->output_offset
617 + sym->st_value);
618
619 name = bfd_elf_string_from_elf_section
620 (input_bfd, symtab_hdr->sh_link, sym->st_name);
621 name = (name == NULL) ? bfd_section_name (input_bfd, osec) : name;
622 }
623 else
624 {
625 bfd_boolean unresolved_reloc;
626 bfd_boolean warned;
627
628 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
629 r_symndx, symtab_hdr, sym_hashes,
630 h, sec, relocation,
631 unresolved_reloc, warned);
632
633 name = h->root.root.string;
634 }
635
636 if (sec != NULL && elf_discarded_section (sec))
637 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
638 rel, relend, howto, contents);
639
640 if (info->relocatable)
641 continue;
642
643 switch (r_type)
644 {
645 case R_IQ2000_HI16:
646 r = iq2000_elf_relocate_hi16 (input_bfd, rel, contents, relocation);
647 break;
648
649 case R_IQ2000_OFFSET_16:
650 r = iq2000_elf_relocate_offset16 (input_bfd, rel, contents, relocation,
651 input_section->output_section->vma
652 + input_section->output_offset
653 + rel->r_offset);
654 break;
655
656 case R_IQ2000_PC16:
657 rel->r_addend -= 4;
658 /* Fall through. */
659
660 default:
661 r = iq2000_final_link_relocate (howto, input_bfd, input_section,
662 contents, rel, relocation);
663 break;
664 }
665
666 if (r != bfd_reloc_ok)
667 {
668 const char * msg = (const char *) NULL;
669
670 switch (r)
671 {
672 case bfd_reloc_overflow:
673 r = info->callbacks->reloc_overflow
674 (info, (h ? &h->root : NULL), name, howto->name,
675 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
676 break;
677
678 case bfd_reloc_undefined:
679 r = info->callbacks->undefined_symbol
680 (info, name, input_bfd, input_section, rel->r_offset, TRUE);
681 break;
682
683 case bfd_reloc_outofrange:
684 msg = _("internal error: out of range error");
685 break;
686
687 case bfd_reloc_notsupported:
688 msg = _("internal error: unsupported relocation error");
689 break;
690
691 case bfd_reloc_dangerous:
692 msg = _("internal error: dangerous relocation");
693 break;
694
695 default:
696 msg = _("internal error: unknown error");
697 break;
698 }
699
700 if (msg)
701 r = info->callbacks->warning
702 (info, msg, name, input_bfd, input_section, rel->r_offset);
703
704 if (! r)
705 return FALSE;
706 }
707 }
708
709 return TRUE;
710 }
711 \f
712
713 /* Return the section that should be marked against GC for a given
714 relocation. */
715
716 static asection *
717 iq2000_elf_gc_mark_hook (asection *sec,
718 struct bfd_link_info *info,
719 Elf_Internal_Rela *rel,
720 struct elf_link_hash_entry *h,
721 Elf_Internal_Sym *sym)
722 {
723 if (h != NULL)
724 switch (ELF32_R_TYPE (rel->r_info))
725 {
726 case R_IQ2000_GNU_VTINHERIT:
727 case R_IQ2000_GNU_VTENTRY:
728 return NULL;
729 }
730
731 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
732 }
733
734 \f
735 /* Return the MACH for an e_flags value. */
736
737 static int
738 elf32_iq2000_machine (bfd *abfd)
739 {
740 switch (elf_elfheader (abfd)->e_flags & EF_IQ2000_CPU_MASK)
741 {
742 case EF_IQ2000_CPU_IQ10:
743 return bfd_mach_iq10;
744
745 case EF_IQ2000_CPU_IQ2000:
746 default:
747 return bfd_mach_iq2000;
748 }
749 }
750
751 \f
752 /* Function to set the ELF flag bits. */
753
754 static bfd_boolean
755 iq2000_elf_set_private_flags (bfd *abfd, flagword flags)
756 {
757 elf_elfheader (abfd)->e_flags = flags;
758 elf_flags_init (abfd) = TRUE;
759 return TRUE;
760 }
761
762 /* Copy backend specific data from one object module to another. */
763
764 static bfd_boolean
765 iq2000_elf_copy_private_bfd_data (bfd *ibfd, bfd *obfd)
766 {
767 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
768 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
769 return TRUE;
770
771 BFD_ASSERT (!elf_flags_init (obfd)
772 || elf_elfheader (obfd)->e_flags == elf_elfheader (ibfd)->e_flags);
773
774 elf_elfheader (obfd)->e_flags = elf_elfheader (ibfd)->e_flags;
775 elf_flags_init (obfd) = TRUE;
776
777 /* Copy object attributes. */
778 _bfd_elf_copy_obj_attributes (ibfd, obfd);
779
780 return TRUE;
781 }
782
783 /* Merge backend specific data from an object
784 file to the output object file when linking. */
785
786 static bfd_boolean
787 iq2000_elf_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
788 {
789 flagword old_flags, old_partial;
790 flagword new_flags, new_partial;
791 bfd_boolean error = FALSE;
792 char new_opt[80];
793 char old_opt[80];
794
795 new_opt[0] = old_opt[0] = '\0';
796 new_flags = elf_elfheader (ibfd)->e_flags;
797 old_flags = elf_elfheader (obfd)->e_flags;
798
799 if (!elf_flags_init (obfd))
800 {
801 /* First call, no flags set. */
802 elf_flags_init (obfd) = TRUE;
803 elf_elfheader (obfd)->e_flags = new_flags;
804 }
805
806 else if (new_flags != old_flags)
807 {
808 /* Warn if different cpu is used, but allow a
809 specific cpu to override the generic cpu. */
810 new_partial = (new_flags & EF_IQ2000_CPU_MASK);
811 old_partial = (old_flags & EF_IQ2000_CPU_MASK);
812
813 if (new_partial != old_partial)
814 {
815 switch (new_partial)
816 {
817 case EF_IQ2000_CPU_IQ10:
818 strcat (new_opt, " -m10");
819 break;
820
821 default:
822 case EF_IQ2000_CPU_IQ2000:
823 strcat (new_opt, " -m2000");
824 break;
825 }
826
827 switch (old_partial)
828 {
829 case EF_IQ2000_CPU_IQ10:
830 strcat (old_opt, " -m10");
831 break;
832
833 default:
834 case EF_IQ2000_CPU_IQ2000:
835 strcat (old_opt, " -m2000");
836 break;
837 }
838 }
839
840 /* Print out any mismatches from above. */
841 if (new_opt[0])
842 {
843 error = TRUE;
844 _bfd_error_handler
845 (_("%s: compiled with %s and linked with modules compiled with %s"),
846 bfd_get_filename (ibfd), new_opt, old_opt);
847 }
848
849 new_flags &= ~ EF_IQ2000_ALL_FLAGS;
850 old_flags &= ~ EF_IQ2000_ALL_FLAGS;
851
852 /* Warn about any other mismatches. */
853 if (new_flags != old_flags)
854 {
855 error = TRUE;
856
857 _bfd_error_handler
858 (_("%s: uses different e_flags (0x%lx) fields than previous modules (0x%lx)"),
859 bfd_get_filename (ibfd), (long)new_flags, (long)old_flags);
860 }
861 }
862
863 if (error)
864 bfd_set_error (bfd_error_bad_value);
865
866 return !error;
867 }
868
869 \f
870 static bfd_boolean
871 iq2000_elf_print_private_bfd_data (bfd *abfd, void * ptr)
872 {
873 FILE *file = (FILE *) ptr;
874 flagword flags;
875
876 BFD_ASSERT (abfd != NULL && ptr != NULL);
877
878 /* Print normal ELF private data. */
879 _bfd_elf_print_private_bfd_data (abfd, ptr);
880
881 flags = elf_elfheader (abfd)->e_flags;
882 fprintf (file, _("private flags = 0x%lx:"), (unsigned long) flags);
883
884 switch (flags & EF_IQ2000_CPU_MASK)
885 {
886 case EF_IQ2000_CPU_IQ10:
887 fprintf (file, " -m10");
888 break;
889 case EF_IQ2000_CPU_IQ2000:
890 fprintf (file, " -m2000");
891 break;
892 default:
893 break;
894 }
895
896 fputc ('\n', file);
897 return TRUE;
898 }
899
900 static
901 bfd_boolean
902 iq2000_elf_object_p (bfd *abfd)
903 {
904 bfd_default_set_arch_mach (abfd, bfd_arch_iq2000,
905 elf32_iq2000_machine (abfd));
906 return TRUE;
907 }
908
909 \f
910 #define ELF_ARCH bfd_arch_iq2000
911 #define ELF_MACHINE_CODE EM_IQ2000
912 #define ELF_MAXPAGESIZE 0x1000
913
914 #define TARGET_BIG_SYM bfd_elf32_iq2000_vec
915 #define TARGET_BIG_NAME "elf32-iq2000"
916
917 #define elf_info_to_howto_rel NULL
918 #define elf_info_to_howto iq2000_info_to_howto_rela
919 #define elf_backend_relocate_section iq2000_elf_relocate_section
920 #define elf_backend_gc_mark_hook iq2000_elf_gc_mark_hook
921 #define elf_backend_check_relocs iq2000_elf_check_relocs
922 #define elf_backend_object_p iq2000_elf_object_p
923 #define elf_backend_rela_normal 1
924
925 #define elf_backend_can_gc_sections 1
926
927 #define bfd_elf32_bfd_reloc_type_lookup iq2000_reloc_type_lookup
928 #define bfd_elf32_bfd_reloc_name_lookup iq2000_reloc_name_lookup
929 #define bfd_elf32_bfd_set_private_flags iq2000_elf_set_private_flags
930 #define bfd_elf32_bfd_copy_private_bfd_data iq2000_elf_copy_private_bfd_data
931 #define bfd_elf32_bfd_merge_private_bfd_data iq2000_elf_merge_private_bfd_data
932 #define bfd_elf32_bfd_print_private_bfd_data iq2000_elf_print_private_bfd_data
933
934 #include "elf32-target.h"
GDB Binutils - Deliverables
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