1 /* BFD back-end for AMD 64 COFF files.
2 Copyright (C) 2006-2021 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 Written by Kai Tietz, OneVision Software GmbH&CoKg. */
22
23 #ifndef COFF_WITH_pex64
24 #define COFF_WITH_pex64
25 #endif
26
27 /* Note we have to make sure not to include headers twice.
28 Not all headers are wrapped in #ifdef guards, so we define
29 PEI_HEADERS to prevent double including here. */
30 #ifndef PEI_HEADERS
31 #include "sysdep.h"
32 #include "bfd.h"
33 #include "libbfd.h"
34 #include "coff/x86_64.h"
35 #include "coff/internal.h"
36 #include "coff/pe.h"
37 #include "libcoff.h"
38 #include "libiberty.h"
39 #endif
40
41 #define BADMAG(x) AMD64BADMAG(x)
42
43 #ifdef COFF_WITH_pex64
44 # undef AOUTSZ
45 # define AOUTSZ PEPAOUTSZ
46 # define PEAOUTHDR PEPAOUTHDR
47 #endif
48
49 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
50
51 /* The page size is a guess based on ELF. */
52
53 #define COFF_PAGE_SIZE 0x1000
54
55 /* All users of this file have bfd_octets_per_byte (abfd, sec) == 1. */
56 #define OCTETS_PER_BYTE(ABFD, SEC) 1
57
58 /* For some reason when using AMD COFF the value stored in the .text
59 section for a reference to a common symbol is the value itself plus
60 any desired offset. Ian Taylor, Cygnus Support. */
61
62 /* If we are producing relocatable output, we need to do some
63 adjustments to the object file that are not done by the
64 bfd_perform_relocation function. This function is called by every
65 reloc type to make any required adjustments. */
66
67 static bfd_reloc_status_type
coff_amd64_reloc(bfd * abfd,arelent * reloc_entry,asymbol * symbol,void * data,asection * input_section ATTRIBUTE_UNUSED,bfd * output_bfd,char ** error_message ATTRIBUTE_UNUSED)68 coff_amd64_reloc (bfd *abfd,
69 arelent *reloc_entry,
70 asymbol *symbol,
71 void * data,
72 asection *input_section ATTRIBUTE_UNUSED,
73 bfd *output_bfd,
74 char **error_message ATTRIBUTE_UNUSED)
75 {
76 symvalue diff;
77
78 #if !defined (COFF_WITH_PE)
79 if (output_bfd == NULL)
80 return bfd_reloc_continue;
81 #endif
82
83 if (bfd_is_com_section (symbol->section))
84 {
85 #if !defined (COFF_WITH_PE)
86 /* We are relocating a common symbol. The current value in the
87 object file is ORIG + OFFSET, where ORIG is the value of the
88 common symbol as seen by the object file when it was compiled
89 (this may be zero if the symbol was undefined) and OFFSET is
90 the offset into the common symbol (normally zero, but may be
91 non-zero when referring to a field in a common structure).
92 ORIG is the negative of reloc_entry->addend, which is set by
93 the CALC_ADDEND macro below. We want to replace the value in
94 the object file with NEW + OFFSET, where NEW is the value of
95 the common symbol which we are going to put in the final
96 object file. NEW is symbol->value. */
97 diff = symbol->value + reloc_entry->addend;
98 #else
99 /* In PE mode, we do not offset the common symbol. */
100 diff = reloc_entry->addend;
101 #endif
102 }
103 else
104 {
105 /* For some reason bfd_perform_relocation always effectively
106 ignores the addend for a COFF target when producing
107 relocatable output. This seems to be always wrong for 386
108 COFF, so we handle the addend here instead. */
109 #if defined (COFF_WITH_PE)
110 if (output_bfd == NULL)
111 {
112 if (symbol->flags & BSF_WEAK)
113 diff = reloc_entry->addend - symbol->value;
114 else
115 diff = -reloc_entry->addend;
116 }
117 else
118 #endif
119 diff = reloc_entry->addend;
120 }
121
122 #if defined (COFF_WITH_PE)
123 if (output_bfd == NULL)
124 {
125 /* PC relative relocations are off by their size. */
126 if (reloc_entry->howto->pc_relative)
127 diff -= bfd_get_reloc_size (reloc_entry->howto);
128
129 if (reloc_entry->howto->type >= R_AMD64_PCRLONG_1
130 && reloc_entry->howto->type <= R_AMD64_PCRLONG_5)
131 diff -= reloc_entry->howto->type - R_AMD64_PCRLONG;
132 }
133
134 if (reloc_entry->howto->type == R_AMD64_IMAGEBASE
135 && output_bfd == NULL)
136 {
137 bfd *obfd = input_section->output_section->owner;
138 struct bfd_link_info *link_info;
139 struct bfd_link_hash_entry *h;
140 switch (bfd_get_flavour (obfd))
141 {
142 case bfd_target_coff_flavour:
143 diff -= pe_data (obfd)->pe_opthdr.ImageBase;
144 break;
145 case bfd_target_elf_flavour:
146 /* Subtract __ImageBase. */
147 link_info = _bfd_get_link_info (obfd);
148 if (link_info == NULL)
149 return bfd_reloc_dangerous;
150 h = bfd_link_hash_lookup (link_info->hash, "__ImageBase",
151 false, false, false);
152 if (h == NULL)
153 return bfd_reloc_dangerous;
154 while (h->type == bfd_link_hash_indirect)
155 h = h->u.i.link;
156 /* ELF symbols in relocatable files are section relative,
157 but in nonrelocatable files they are virtual addresses. */
158 diff -= (h->u.def.value
159 + h->u.def.section->output_offset
160 + h->u.def.section->output_section->vma);
161 break;
162 default:
163 break;
164 }
165 }
166 #endif
167
168 #define DOIT(x) \
169 x = ((x & ~howto->dst_mask) | (((x & howto->src_mask) + diff) & howto->dst_mask))
170
171 if (diff != 0)
172 {
173 reloc_howto_type *howto = reloc_entry->howto;
174 bfd_size_type octets = (reloc_entry->address
175 * OCTETS_PER_BYTE (abfd, input_section));
176 unsigned char *addr = (unsigned char *) data + octets;
177
178 if (!bfd_reloc_offset_in_range (howto, abfd, input_section, octets))
179 return bfd_reloc_outofrange;
180
181 switch (howto->size)
182 {
183 case 0:
184 {
185 char x = bfd_get_8 (abfd, addr);
186 DOIT (x);
187 bfd_put_8 (abfd, x, addr);
188 }
189 break;
190
191 case 1:
192 {
193 short x = bfd_get_16 (abfd, addr);
194 DOIT (x);
195 bfd_put_16 (abfd, (bfd_vma) x, addr);
196 }
197 break;
198
199 case 2:
200 {
201 long x = bfd_get_32 (abfd, addr);
202 DOIT (x);
203 bfd_put_32 (abfd, (bfd_vma) x, addr);
204 }
205 break;
206
207 case 4:
208 {
209 bfd_uint64_t x = bfd_get_64 (abfd, addr);
210 DOIT (x);
211 bfd_put_64 (abfd, x, addr);
212 }
213 break;
214
215 default:
216 bfd_set_error (bfd_error_bad_value);
217 return bfd_reloc_notsupported;
218 }
219 }
220
221 /* Now let bfd_perform_relocation finish everything up. */
222 return bfd_reloc_continue;
223 }
224
225 #if defined(COFF_WITH_PE)
226 /* Return TRUE if this relocation should appear in the output .reloc
227 section. */
228
229 static bool
in_reloc_p(bfd * abfd ATTRIBUTE_UNUSED,reloc_howto_type * howto)230 in_reloc_p (bfd *abfd ATTRIBUTE_UNUSED, reloc_howto_type *howto)
231 {
232 return ! howto->pc_relative && howto->type != R_AMD64_IMAGEBASE
233 && howto->type != R_AMD64_SECREL;
234 }
235 #endif /* COFF_WITH_PE */
236
237 #ifndef PCRELOFFSET
238 #define PCRELOFFSET true
239 #endif
240
241 static reloc_howto_type howto_table[] =
242 {
243 EMPTY_HOWTO (0),
244 HOWTO (R_AMD64_DIR64, /* type 1*/
245 0, /* rightshift */
246 4, /* size (0 = byte, 1 = short, 2 = long, 4 = long long) */
247 64, /* bitsize */
248 false, /* pc_relative */
249 0, /* bitpos */
250 complain_overflow_bitfield, /* complain_on_overflow */
251 coff_amd64_reloc, /* special_function */
252 "IMAGE_REL_AMD64_ADDR64", /* name */
253 true, /* partial_inplace */
254 0xffffffffffffffffll, /* src_mask */
255 0xffffffffffffffffll, /* dst_mask */
256 true), /* pcrel_offset */
257 HOWTO (R_AMD64_DIR32, /* type 2 */
258 0, /* rightshift */
259 2, /* size (0 = byte, 1 = short, 2 = long) */
260 32, /* bitsize */
261 false, /* pc_relative */
262 0, /* bitpos */
263 complain_overflow_bitfield, /* complain_on_overflow */
264 coff_amd64_reloc, /* special_function */
265 "IMAGE_REL_AMD64_ADDR32", /* name */
266 true, /* partial_inplace */
267 0xffffffff, /* src_mask */
268 0xffffffff, /* dst_mask */
269 true), /* pcrel_offset */
270 /* PE IMAGE_REL_AMD64_ADDR32NB relocation (3). */
271 HOWTO (R_AMD64_IMAGEBASE, /* type */
272 0, /* rightshift */
273 2, /* size (0 = byte, 1 = short, 2 = long) */
274 32, /* bitsize */
275 false, /* pc_relative */
276 0, /* bitpos */
277 complain_overflow_bitfield, /* complain_on_overflow */
278 coff_amd64_reloc, /* special_function */
279 "IMAGE_REL_AMD64_ADDR32NB", /* name */
280 true, /* partial_inplace */
281 0xffffffff, /* src_mask */
282 0xffffffff, /* dst_mask */
283 false), /* pcrel_offset */
284 /* 32-bit longword PC relative relocation (4). */
285 HOWTO (R_AMD64_PCRLONG, /* type 4 */
286 0, /* rightshift */
287 2, /* size (0 = byte, 1 = short, 2 = long) */
288 32, /* bitsize */
289 true, /* pc_relative */
290 0, /* bitpos */
291 complain_overflow_signed, /* complain_on_overflow */
292 coff_amd64_reloc, /* special_function */
293 "IMAGE_REL_AMD64_REL32", /* name */
294 true, /* partial_inplace */
295 0xffffffff, /* src_mask */
296 0xffffffff, /* dst_mask */
297 PCRELOFFSET), /* pcrel_offset */
298
299 HOWTO (R_AMD64_PCRLONG_1, /* type 5 */
300 0, /* rightshift */
301 2, /* size (0 = byte, 1 = short, 2 = long) */
302 32, /* bitsize */
303 true, /* pc_relative */
304 0, /* bitpos */
305 complain_overflow_signed, /* complain_on_overflow */
306 coff_amd64_reloc, /* special_function */
307 "IMAGE_REL_AMD64_REL32_1", /* name */
308 true, /* partial_inplace */
309 0xffffffff, /* src_mask */
310 0xffffffff, /* dst_mask */
311 PCRELOFFSET), /* pcrel_offset */
312 HOWTO (R_AMD64_PCRLONG_2, /* type 6 */
313 0, /* rightshift */
314 2, /* size (0 = byte, 1 = short, 2 = long) */
315 32, /* bitsize */
316 true, /* pc_relative */
317 0, /* bitpos */
318 complain_overflow_signed, /* complain_on_overflow */
319 coff_amd64_reloc, /* special_function */
320 "IMAGE_REL_AMD64_REL32_2", /* name */
321 true, /* partial_inplace */
322 0xffffffff, /* src_mask */
323 0xffffffff, /* dst_mask */
324 PCRELOFFSET), /* pcrel_offset */
325 HOWTO (R_AMD64_PCRLONG_3, /* type 7 */
326 0, /* rightshift */
327 2, /* size (0 = byte, 1 = short, 2 = long) */
328 32, /* bitsize */
329 true, /* pc_relative */
330 0, /* bitpos */
331 complain_overflow_signed, /* complain_on_overflow */
332 coff_amd64_reloc, /* special_function */
333 "IMAGE_REL_AMD64_REL32_3", /* name */
334 true, /* partial_inplace */
335 0xffffffff, /* src_mask */
336 0xffffffff, /* dst_mask */
337 PCRELOFFSET), /* pcrel_offset */
338 HOWTO (R_AMD64_PCRLONG_4, /* type 8 */
339 0, /* rightshift */
340 2, /* size (0 = byte, 1 = short, 2 = long) */
341 32, /* bitsize */
342 true, /* pc_relative */
343 0, /* bitpos */
344 complain_overflow_signed, /* complain_on_overflow */
345 coff_amd64_reloc, /* special_function */
346 "IMAGE_REL_AMD64_REL32_4", /* name */
347 true, /* partial_inplace */
348 0xffffffff, /* src_mask */
349 0xffffffff, /* dst_mask */
350 PCRELOFFSET), /* pcrel_offset */
351 HOWTO (R_AMD64_PCRLONG_5, /* type 9 */
352 0, /* rightshift */
353 2, /* size (0 = byte, 1 = short, 2 = long) */
354 32, /* bitsize */
355 true, /* pc_relative */
356 0, /* bitpos */
357 complain_overflow_signed, /* complain_on_overflow */
358 coff_amd64_reloc, /* special_function */
359 "IMAGE_REL_AMD64_REL32_5", /* name */
360 true, /* partial_inplace */
361 0xffffffff, /* src_mask */
362 0xffffffff, /* dst_mask */
363 PCRELOFFSET), /* pcrel_offset */
364 EMPTY_HOWTO (10), /* R_AMD64_SECTION 10 */
365 #if defined(COFF_WITH_PE)
366 /* 32-bit longword section relative relocation (11). */
367 HOWTO (R_AMD64_SECREL, /* type */
368 0, /* rightshift */
369 2, /* size (0 = byte, 1 = short, 2 = long) */
370 32, /* bitsize */
371 false, /* pc_relative */
372 0, /* bitpos */
373 complain_overflow_bitfield, /* complain_on_overflow */
374 coff_amd64_reloc, /* special_function */
375 "IMAGE_REL_AMD64_SECREL", /* name */
376 true, /* partial_inplace */
377 0xffffffff, /* src_mask */
378 0xffffffff, /* dst_mask */
379 true), /* pcrel_offset */
380 #else
381 EMPTY_HOWTO (11),
382 #endif
383 EMPTY_HOWTO (12),
384 EMPTY_HOWTO (13),
385 #ifndef DONT_EXTEND_AMD64
386 HOWTO (R_AMD64_PCRQUAD,
387 0, /* rightshift */
388 4, /* size (0 = byte, 1 = short, 2 = long) */
389 64, /* bitsize */
390 true, /* pc_relative */
391 0, /* bitpos */
392 complain_overflow_signed, /* complain_on_overflow */
393 coff_amd64_reloc, /* special_function */
394 "R_X86_64_PC64", /* name */
395 true, /* partial_inplace */
396 0xffffffffffffffffll, /* src_mask */
397 0xffffffffffffffffll, /* dst_mask */
398 PCRELOFFSET), /* pcrel_offset */
399 #else
400 EMPTY_HOWTO (14),
401 #endif
402 /* Byte relocation (15). */
403 HOWTO (R_RELBYTE, /* type */
404 0, /* rightshift */
405 0, /* size (0 = byte, 1 = short, 2 = long) */
406 8, /* bitsize */
407 false, /* pc_relative */
408 0, /* bitpos */
409 complain_overflow_bitfield, /* complain_on_overflow */
410 coff_amd64_reloc, /* special_function */
411 "R_X86_64_8", /* name */
412 true, /* partial_inplace */
413 0x000000ff, /* src_mask */
414 0x000000ff, /* dst_mask */
415 PCRELOFFSET), /* pcrel_offset */
416 /* 16-bit word relocation (16). */
417 HOWTO (R_RELWORD, /* type */
418 0, /* rightshift */
419 1, /* size (0 = byte, 1 = short, 2 = long) */
420 16, /* bitsize */
421 false, /* pc_relative */
422 0, /* bitpos */
423 complain_overflow_bitfield, /* complain_on_overflow */
424 coff_amd64_reloc, /* special_function */
425 "R_X86_64_16", /* name */
426 true, /* partial_inplace */
427 0x0000ffff, /* src_mask */
428 0x0000ffff, /* dst_mask */
429 PCRELOFFSET), /* pcrel_offset */
430 /* 32-bit longword relocation (17). */
431 HOWTO (R_RELLONG, /* type */
432 0, /* rightshift */
433 2, /* size (0 = byte, 1 = short, 2 = long) */
434 32, /* bitsize */
435 false, /* pc_relative */
436 0, /* bitpos */
437 complain_overflow_bitfield, /* complain_on_overflow */
438 coff_amd64_reloc, /* special_function */
439 "R_X86_64_32S", /* name */
440 true, /* partial_inplace */
441 0xffffffff, /* src_mask */
442 0xffffffff, /* dst_mask */
443 PCRELOFFSET), /* pcrel_offset */
444 /* Byte PC relative relocation (18). */
445 HOWTO (R_PCRBYTE, /* type */
446 0, /* rightshift */
447 0, /* size (0 = byte, 1 = short, 2 = long) */
448 8, /* bitsize */
449 true, /* pc_relative */
450 0, /* bitpos */
451 complain_overflow_signed, /* complain_on_overflow */
452 coff_amd64_reloc, /* special_function */
453 "R_X86_64_PC8", /* name */
454 true, /* partial_inplace */
455 0x000000ff, /* src_mask */
456 0x000000ff, /* dst_mask */
457 PCRELOFFSET), /* pcrel_offset */
458 /* 16-bit word PC relative relocation (19). */
459 HOWTO (R_PCRWORD, /* type */
460 0, /* rightshift */
461 1, /* size (0 = byte, 1 = short, 2 = long) */
462 16, /* bitsize */
463 true, /* pc_relative */
464 0, /* bitpos */
465 complain_overflow_signed, /* complain_on_overflow */
466 coff_amd64_reloc, /* special_function */
467 "R_X86_64_PC16", /* name */
468 true, /* partial_inplace */
469 0x0000ffff, /* src_mask */
470 0x0000ffff, /* dst_mask */
471 PCRELOFFSET), /* pcrel_offset */
472 /* 32-bit longword PC relative relocation (20). */
473 HOWTO (R_PCRLONG, /* type */
474 0, /* rightshift */
475 2, /* size (0 = byte, 1 = short, 2 = long) */
476 32, /* bitsize */
477 true, /* pc_relative */
478 0, /* bitpos */
479 complain_overflow_signed, /* complain_on_overflow */
480 coff_amd64_reloc, /* special_function */
481 "R_X86_64_PC32", /* name */
482 true, /* partial_inplace */
483 0xffffffff, /* src_mask */
484 0xffffffff, /* dst_mask */
485 PCRELOFFSET) /* pcrel_offset */
486 };
487
488 #define NUM_HOWTOS ARRAY_SIZE (howto_table)
489
490 /* Turn a howto into a reloc nunmber */
491
492 #define SELECT_RELOC(x,howto) { x.r_type = howto->type; }
493 #define I386 1 /* Customize coffcode.h */
494 #define AMD64 1
495
496 #define RTYPE2HOWTO(cache_ptr, dst) \
497 ((cache_ptr)->howto = \
498 ((dst)->r_type < NUM_HOWTOS) \
499 ? howto_table + (dst)->r_type \
500 : NULL)
501
502 /* For 386 COFF a STYP_NOLOAD | STYP_BSS section is part of a shared
503 library. On some other COFF targets STYP_BSS is normally
504 STYP_NOLOAD. */
505 #define BSS_NOLOAD_IS_SHARED_LIBRARY
506
507 /* Compute the addend of a reloc. If the reloc is to a common symbol,
508 the object file contains the value of the common symbol. By the
509 time this is called, the linker may be using a different symbol
510 from a different object file with a different value. Therefore, we
511 hack wildly to locate the original symbol from this file so that we
512 can make the correct adjustment. This macro sets coffsym to the
513 symbol from the original file, and uses it to set the addend value
514 correctly. If this is not a common symbol, the usual addend
515 calculation is done, except that an additional tweak is needed for
516 PC relative relocs.
517 FIXME: This macro refers to symbols and asect; these are from the
518 calling function, not the macro arguments. */
519
520 #define CALC_ADDEND(abfd, ptr, reloc, cache_ptr) \
521 { \
522 coff_symbol_type *coffsym = NULL; \
523 \
524 if (ptr && bfd_asymbol_bfd (ptr) != abfd) \
525 coffsym = (obj_symbols (abfd) \
526 + (cache_ptr->sym_ptr_ptr - symbols)); \
527 else if (ptr) \
528 coffsym = coff_symbol_from (ptr); \
529 \
530 if (coffsym != NULL \
531 && coffsym->native->u.syment.n_scnum == 0) \
532 cache_ptr->addend = - coffsym->native->u.syment.n_value; \
533 else if (ptr && bfd_asymbol_bfd (ptr) == abfd \
534 && ptr->section != NULL) \
535 cache_ptr->addend = - (ptr->section->vma + ptr->value); \
536 else \
537 cache_ptr->addend = 0; \
538 if (ptr && reloc.r_type < NUM_HOWTOS \
539 && howto_table[reloc.r_type].pc_relative) \
540 cache_ptr->addend += asect->vma; \
541 }
542
543 /* We use the special COFF backend linker. For normal AMD64 COFF, we
544 can use the generic relocate_section routine. For PE, we need our
545 own routine. */
546
547 #if !defined(COFF_WITH_PE)
548
549 #define coff_relocate_section _bfd_coff_generic_relocate_section
550
551 #else /* COFF_WITH_PE */
552
553 /* The PE relocate section routine. The only difference between this
554 and the regular routine is that we don't want to do anything for a
555 relocatable link. */
556
557 static bool
coff_pe_amd64_relocate_section(bfd * output_bfd,struct bfd_link_info * info,bfd * input_bfd,asection * input_section,bfd_byte * contents,struct internal_reloc * relocs,struct internal_syment * syms,asection ** sections)558 coff_pe_amd64_relocate_section (bfd *output_bfd,
559 struct bfd_link_info *info,
560 bfd *input_bfd,
561 asection *input_section,
562 bfd_byte *contents,
563 struct internal_reloc *relocs,
564 struct internal_syment *syms,
565 asection **sections)
566 {
567 if (bfd_link_relocatable (info))
568 return true;
569
570 return _bfd_coff_generic_relocate_section (output_bfd, info, input_bfd,input_section, contents,relocs, syms, sections);
571 }
572
573 #define coff_relocate_section coff_pe_amd64_relocate_section
574
575 #endif /* COFF_WITH_PE */
576
577 /* Convert an rtype to howto for the COFF backend linker. */
578
579 static reloc_howto_type *
coff_amd64_rtype_to_howto(bfd * abfd ATTRIBUTE_UNUSED,asection * sec,struct internal_reloc * rel,struct coff_link_hash_entry * h,struct internal_syment * sym,bfd_vma * addendp)580 coff_amd64_rtype_to_howto (bfd *abfd ATTRIBUTE_UNUSED,
581 asection *sec,
582 struct internal_reloc *rel,
583 struct coff_link_hash_entry *h,
584 struct internal_syment *sym,
585 bfd_vma *addendp)
586 {
587 reloc_howto_type *howto;
588
589 if (rel->r_type >= NUM_HOWTOS)
590 {
591 bfd_set_error (bfd_error_bad_value);
592 return NULL;
593 }
594 howto = howto_table + rel->r_type;
595
596 #if defined(COFF_WITH_PE)
597 /* Cancel out code in _bfd_coff_generic_relocate_section. */
598 *addendp = 0;
599 if (rel->r_type >= R_AMD64_PCRLONG_1 && rel->r_type <= R_AMD64_PCRLONG_5)
600 {
601 *addendp -= (bfd_vma)(rel->r_type - R_AMD64_PCRLONG);
602 rel->r_type = R_AMD64_PCRLONG;
603 }
604 #endif
605
606 if (howto->pc_relative)
607 *addendp += sec->vma;
608
609 if (sym != NULL && sym->n_scnum == 0 && sym->n_value != 0)
610 {
611 /* This is a common symbol. The section contents include the
612 size (sym->n_value) as an addend. The relocate_section
613 function will be adding in the final value of the symbol. We
614 need to subtract out the current size in order to get the
615 correct result. */
616 BFD_ASSERT (h != NULL);
617
618 #if !defined(COFF_WITH_PE)
619 /* I think we *do* want to bypass this. If we don't, I have
620 seen some data parameters get the wrong relocation address.
621 If I link two versions with and without this section bypassed
622 and then do a binary comparison, the addresses which are
623 different can be looked up in the map. The case in which
624 this section has been bypassed has addresses which correspond
625 to values I can find in the map. */
626 *addendp -= sym->n_value;
627 #endif
628 }
629
630 #if !defined(COFF_WITH_PE)
631 /* If the output symbol is common (in which case this must be a
632 relocatable link), we need to add in the final size of the
633 common symbol. */
634 if (h != NULL && h->root.type == bfd_link_hash_common)
635 *addendp += h->root.u.c.size;
636 #endif
637
638 #if defined(COFF_WITH_PE)
639 if (howto->pc_relative)
640 {
641 #ifndef DONT_EXTEND_AMD64
642 if (rel->r_type == R_AMD64_PCRQUAD)
643 *addendp -= 8;
644 else
645 #endif
646 *addendp -= 4;
647
648 /* If the symbol is defined, then the generic code is going to
649 add back the symbol value in order to cancel out an
650 adjustment it made to the addend. However, we set the addend
651 to 0 at the start of this function. We need to adjust here,
652 to avoid the adjustment the generic code will make. FIXME:
653 This is getting a bit hackish. */
654 if (sym != NULL && sym->n_scnum != 0)
655 *addendp -= sym->n_value;
656 }
657
658 if (rel->r_type == R_AMD64_IMAGEBASE
659 && (bfd_get_flavour (sec->output_section->owner) == bfd_target_coff_flavour))
660 *addendp -= pe_data (sec->output_section->owner)->pe_opthdr.ImageBase;
661
662 if (rel->r_type == R_AMD64_SECREL)
663 {
664 bfd_vma osect_vma;
665
666 if (h && (h->root.type == bfd_link_hash_defined
667 || h->root.type == bfd_link_hash_defweak))
668 osect_vma = h->root.u.def.section->output_section->vma;
669 else
670 {
671 asection *s;
672 int i;
673
674 /* Sigh, the only way to get the section to offset against
675 is to find it the hard way. */
676 for (s = abfd->sections, i = 1; i < sym->n_scnum; i++)
677 s = s->next;
678
679 osect_vma = s->output_section->vma;
680 }
681
682 *addendp -= osect_vma;
683 }
684 #endif
685
686 return howto;
687 }
688
689 #define coff_bfd_reloc_type_lookup coff_amd64_reloc_type_lookup
690 #define coff_bfd_reloc_name_lookup coff_amd64_reloc_name_lookup
691
692 static reloc_howto_type *
coff_amd64_reloc_type_lookup(bfd * abfd ATTRIBUTE_UNUSED,bfd_reloc_code_real_type code)693 coff_amd64_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, bfd_reloc_code_real_type code)
694 {
695 switch (code)
696 {
697 case BFD_RELOC_RVA:
698 return howto_table + R_AMD64_IMAGEBASE;
699 case BFD_RELOC_32:
700 return howto_table + R_AMD64_DIR32;
701 case BFD_RELOC_64:
702 return howto_table + R_AMD64_DIR64;
703 case BFD_RELOC_64_PCREL:
704 #ifndef DONT_EXTEND_AMD64
705 return howto_table + R_AMD64_PCRQUAD;
706 #else
707 /* Fall through. */
708 #endif
709 case BFD_RELOC_32_PCREL:
710 return howto_table + R_AMD64_PCRLONG;
711 case BFD_RELOC_X86_64_32S:
712 return howto_table + R_RELLONG;
713 case BFD_RELOC_16:
714 return howto_table + R_RELWORD;
715 case BFD_RELOC_16_PCREL:
716 return howto_table + R_PCRWORD;
717 case BFD_RELOC_8:
718 return howto_table + R_RELBYTE;
719 case BFD_RELOC_8_PCREL:
720 return howto_table + R_PCRBYTE;
721 #if defined(COFF_WITH_PE)
722 case BFD_RELOC_32_SECREL:
723 return howto_table + R_AMD64_SECREL;
724 #endif
725 default:
726 BFD_FAIL ();
727 return 0;
728 }
729 }
730
731 static reloc_howto_type *
coff_amd64_reloc_name_lookup(bfd * abfd ATTRIBUTE_UNUSED,const char * r_name)732 coff_amd64_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
733 const char *r_name)
734 {
735 unsigned int i;
736
737 for (i = 0; i < NUM_HOWTOS; i++)
738 if (howto_table[i].name != NULL
739 && strcasecmp (howto_table[i].name, r_name) == 0)
740 return &howto_table[i];
741
742 return NULL;
743 }
744
745 #define coff_rtype_to_howto coff_amd64_rtype_to_howto
746
747 #ifdef TARGET_UNDERSCORE
748
749 /* If amd64 gcc uses underscores for symbol names, then it does not use
750 a leading dot for local labels, so if TARGET_UNDERSCORE is defined
751 we treat all symbols starting with L as local. */
752
753 static bool
coff_amd64_is_local_label_name(bfd * abfd,const char * name)754 coff_amd64_is_local_label_name (bfd *abfd, const char *name)
755 {
756 if (name[0] == 'L')
757 return true;
758
759 return _bfd_coff_is_local_label_name (abfd, name);
760 }
761
762 #define coff_bfd_is_local_label_name coff_amd64_is_local_label_name
763
764 #endif /* TARGET_UNDERSCORE */
765
766 #ifndef bfd_pe_print_pdata
767 #define bfd_pe_print_pdata NULL
768 #endif
769
770 #include "coffcode.h"
771
772 #ifdef PE
773 #define amd64coff_object_p pe_bfd_object_p
774 #else
775 #define amd64coff_object_p coff_object_p
776 #endif
777
778 const bfd_target
779 #ifdef TARGET_SYM
780 TARGET_SYM =
781 #else
782 x86_64_coff_vec =
783 #endif
784 {
785 #ifdef TARGET_NAME
786 TARGET_NAME,
787 #else
788 "coff-x86-64", /* Name. */
789 #endif
790 bfd_target_coff_flavour,
791 BFD_ENDIAN_LITTLE, /* Data byte order is little. */
792 BFD_ENDIAN_LITTLE, /* Header byte order is little. */
793
794 (HAS_RELOC | EXEC_P /* Object flags. */
795 | HAS_LINENO | HAS_DEBUG
796 | HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED | BFD_COMPRESS | BFD_DECOMPRESS),
797
798 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC /* Section flags. */
799 #if defined(COFF_WITH_PE)
800 | SEC_LINK_ONCE | SEC_LINK_DUPLICATES | SEC_READONLY | SEC_DEBUGGING
801 #endif
802 | SEC_CODE | SEC_DATA | SEC_EXCLUDE ),
803
804 #ifdef TARGET_UNDERSCORE
805 TARGET_UNDERSCORE, /* Leading underscore. */
806 #else
807 0, /* Leading underscore. */
808 #endif
809 '/', /* Ar_pad_char. */
810 15, /* Ar_max_namelen. */
811 0, /* match priority. */
812 TARGET_KEEP_UNUSED_SECTION_SYMBOLS, /* keep unused section symbols. */
813
814 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
815 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
816 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* Data. */
817 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
818 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
819 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* Hdrs. */
820
821 /* Note that we allow an object file to be treated as a core file as well. */
822 { /* bfd_check_format. */
823 _bfd_dummy_target,
824 amd64coff_object_p,
825 bfd_generic_archive_p,
826 amd64coff_object_p
827 },
828 { /* bfd_set_format. */
829 _bfd_bool_bfd_false_error,
830 coff_mkobject,
831 _bfd_generic_mkarchive,
832 _bfd_bool_bfd_false_error
833 },
834 { /* bfd_write_contents. */
835 _bfd_bool_bfd_false_error,
836 coff_write_object_contents,
837 _bfd_write_archive_contents,
838 _bfd_bool_bfd_false_error
839 },
840
841 BFD_JUMP_TABLE_GENERIC (coff),
842 BFD_JUMP_TABLE_COPY (coff),
843 BFD_JUMP_TABLE_CORE (_bfd_nocore),
844 BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
845 BFD_JUMP_TABLE_SYMBOLS (coff),
846 BFD_JUMP_TABLE_RELOCS (coff),
847 BFD_JUMP_TABLE_WRITE (coff),
848 BFD_JUMP_TABLE_LINK (coff),
849 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
850
851 NULL,
852
853 COFF_SWAP_TABLE
854 };
855
856 /* Entry for big object files. */
857
858 #ifdef COFF_WITH_PE_BIGOBJ
859 const bfd_target
860 TARGET_SYM_BIG =
861 {
862 TARGET_NAME_BIG,
863 bfd_target_coff_flavour,
864 BFD_ENDIAN_LITTLE, /* Data byte order is little. */
865 BFD_ENDIAN_LITTLE, /* Header byte order is little. */
866
867 (HAS_RELOC | EXEC_P /* Object flags. */
868 | HAS_LINENO | HAS_DEBUG
869 | HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED | BFD_COMPRESS | BFD_DECOMPRESS),
870
871 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC /* Section flags. */
872 #if defined(COFF_WITH_PE)
873 | SEC_LINK_ONCE | SEC_LINK_DUPLICATES | SEC_READONLY | SEC_DEBUGGING
874 #endif
875 | SEC_CODE | SEC_DATA | SEC_EXCLUDE ),
876
877 #ifdef TARGET_UNDERSCORE
878 TARGET_UNDERSCORE, /* Leading underscore. */
879 #else
880 0, /* Leading underscore. */
881 #endif
882 '/', /* Ar_pad_char. */
883 15, /* Ar_max_namelen. */
884 0, /* match priority. */
885 TARGET_KEEP_UNUSED_SECTION_SYMBOLS, /* keep unused section symbols. */
886
887 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
888 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
889 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* Data. */
890 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
891 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
892 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* Hdrs. */
893
894 /* Note that we allow an object file to be treated as a core file as well. */
895 { /* bfd_check_format. */
896 _bfd_dummy_target,
897 amd64coff_object_p,
898 bfd_generic_archive_p,
899 amd64coff_object_p
900 },
901 { /* bfd_set_format. */
902 _bfd_bool_bfd_false_error,
903 coff_mkobject,
904 _bfd_generic_mkarchive,
905 _bfd_bool_bfd_false_error
906 },
907 { /* bfd_write_contents. */
908 _bfd_bool_bfd_false_error,
909 coff_write_object_contents,
910 _bfd_write_archive_contents,
911 _bfd_bool_bfd_false_error
912 },
913
914 BFD_JUMP_TABLE_GENERIC (coff),
915 BFD_JUMP_TABLE_COPY (coff),
916 BFD_JUMP_TABLE_CORE (_bfd_nocore),
917 BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
918 BFD_JUMP_TABLE_SYMBOLS (coff),
919 BFD_JUMP_TABLE_RELOCS (coff),
920 BFD_JUMP_TABLE_WRITE (coff),
921 BFD_JUMP_TABLE_LINK (coff),
922 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
923
924 NULL,
925
926 &bigobj_swap_table
927 };
928 #endif
929