* aix386-core.c: Remove use of PTR and PARAMS macros.
[deliverable/binutils-gdb.git] / bfd / coff-i960.c
1 /* BFD back-end for Intel 960 COFF files.
2 Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1997, 1999, 2000, 2001,
3 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2011, 2012
4 Free Software Foundation, Inc.
5 Written by Cygnus Support.
6
7 This file is part of BFD, the Binary File Descriptor library.
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22 MA 02110-1301, USA. */
23
24 #define I960 1
25 #define BADMAG(x) I960BADMAG(x)
26
27 #include "sysdep.h"
28 #include "bfd.h"
29 #include "libbfd.h"
30 #include "coff/i960.h"
31 #include "coff/internal.h"
32
33 #ifndef bfd_pe_print_pdata
34 #define bfd_pe_print_pdata NULL
35 #endif
36
37 #include "libcoff.h" /* To allow easier abstraction-breaking. */
38
39
40 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (3)
41 #define COFF_ALIGN_IN_SECTION_HEADER 1
42
43 #define GET_SCNHDR_ALIGN H_GET_32
44 #define PUT_SCNHDR_ALIGN H_PUT_32
45
46 /* The i960 does not support an MMU, so COFF_PAGE_SIZE can be
47 arbitrarily small. */
48 #define COFF_PAGE_SIZE 1
49
50 #define COFF_LONG_FILENAMES
51
52 /* This set of local label names is taken from gas. */
53
54 static bfd_boolean
55 coff_i960_is_local_label_name (bfd *abfd ATTRIBUTE_UNUSED, const char *name)
56 {
57 return (name[0] == 'L'
58 || (name[0] == '.'
59 && (name[1] == 'C'
60 || name[1] == 'I'
61 || name[1] == '.')));
62 }
63
64 /* This is just like the usual CALC_ADDEND, but it includes the
65 section VMA for PC relative relocs. */
66 #ifndef CALC_ADDEND
67 #define CALC_ADDEND(abfd, ptr, reloc, cache_ptr) \
68 { \
69 coff_symbol_type *coffsym = (coff_symbol_type *) NULL; \
70 if (ptr && bfd_asymbol_bfd (ptr) != abfd) \
71 coffsym = (obj_symbols (abfd) \
72 + (cache_ptr->sym_ptr_ptr - symbols)); \
73 else if (ptr) \
74 coffsym = coff_symbol_from (abfd, ptr); \
75 if (coffsym != (coff_symbol_type *) NULL \
76 && coffsym->native->u.syment.n_scnum == 0) \
77 cache_ptr->addend = 0; \
78 else if (ptr && bfd_asymbol_bfd (ptr) == abfd \
79 && ptr->section != (asection *) NULL) \
80 cache_ptr->addend = - (ptr->section->vma + ptr->value); \
81 else \
82 cache_ptr->addend = 0; \
83 if (ptr && (reloc.r_type == 25 || reloc.r_type == 27)) \
84 cache_ptr->addend += asect->vma; \
85 }
86 #endif
87
88 #define CALLS 0x66003800 /* Template for 'calls' instruction */
89 #define BAL 0x0b000000 /* Template for 'bal' instruction */
90 #define BAL_MASK 0x00ffffff
91
92 static bfd_reloc_status_type
93 optcall_callback (bfd *abfd,
94 arelent *reloc_entry,
95 asymbol *symbol_in,
96 void * data,
97 asection *input_section,
98 bfd *ignore_bfd ATTRIBUTE_UNUSED,
99 char **error_message)
100 {
101 /* This item has already been relocated correctly, but we may be
102 * able to patch in yet better code - done by digging out the
103 * correct info on this symbol */
104 bfd_reloc_status_type result;
105 coff_symbol_type *cs = coffsymbol(symbol_in);
106
107 /* Don't do anything with symbols which aren't tied up yet,
108 except move the reloc. */
109 if (bfd_is_und_section (cs->symbol.section)) {
110 reloc_entry->address += input_section->output_offset;
111 return bfd_reloc_ok;
112 }
113
114 /* So the target symbol has to be of coff type, and the symbol
115 has to have the correct native information within it */
116 if ((bfd_asymbol_flavour(&cs->symbol) != bfd_target_coff_flavour)
117 || (cs->native == (combined_entry_type *)NULL))
118 {
119 /* This is interesting, consider the case where we're outputting coff
120 from a mix n match input, linking from coff to a symbol defined in a
121 bout file will cause this match to be true. Should I complain? This
122 will only work if the bout symbol is non leaf. */
123 *error_message =
124 (char *) _("uncertain calling convention for non-COFF symbol");
125 result = bfd_reloc_dangerous;
126 }
127 else
128 {
129 switch (cs->native->u.syment.n_sclass)
130 {
131 case C_LEAFSTAT:
132 case C_LEAFEXT:
133 /* This is a call to a leaf procedure, replace instruction with a bal
134 to the correct location. */
135 {
136 union internal_auxent *aux = &((cs->native+2)->u.auxent);
137 int word = bfd_get_32 (abfd, (bfd_byte *)data + reloc_entry->address);
138 int olf = (aux->x_bal.x_balntry - cs->native->u.syment.n_value);
139 BFD_ASSERT(cs->native->u.syment.n_numaux==2);
140
141 /* We replace the original call instruction with a bal to
142 the bal entry point - the offset of which is described in
143 the 2nd auxent of the original symbol. We keep the native
144 sym and auxents untouched, so the delta between the two
145 is the offset of the bal entry point. */
146 word = ((word + olf) & BAL_MASK) | BAL;
147 bfd_put_32 (abfd, (bfd_vma) word,
148 (bfd_byte *) data + reloc_entry->address);
149 }
150 result = bfd_reloc_ok;
151 break;
152 case C_SCALL:
153 /* This is a call to a system call, replace with a calls to # */
154 BFD_ASSERT(0);
155 result = bfd_reloc_ok;
156 break;
157 default:
158 result = bfd_reloc_ok;
159 break;
160 }
161 }
162 return result;
163 }
164
165 /* i960 COFF is used by VxWorks 5.1. However, VxWorks 5.1 does not
166 appear to correctly handle a reloc against a symbol defined in the
167 same object file. It appears to simply discard such relocs, rather
168 than adding their values into the object file. We handle this here
169 by converting all relocs against defined symbols into relocs
170 against the section symbol, when generating a relocatable output
171 file.
172
173 Note that this function is only called if we are not using the COFF
174 specific backend linker. It only does something when doing a
175 relocatable link, which will almost certainly fail when not
176 generating COFF i960 output, so this function is actually no longer
177 useful. It was used before this target was converted to use the
178 COFF specific backend linker. */
179
180 static bfd_reloc_status_type
181 coff_i960_relocate (bfd *abfd,
182 arelent *reloc_entry,
183 asymbol *symbol,
184 void * data ATTRIBUTE_UNUSED,
185 asection *input_section ATTRIBUTE_UNUSED,
186 bfd *output_bfd,
187 char **error_message ATTRIBUTE_UNUSED)
188 {
189 asection *osec;
190
191 if (output_bfd == NULL)
192 {
193 /* Not generating relocatable output file. */
194 return bfd_reloc_continue;
195 }
196
197 if (bfd_is_und_section (bfd_get_section (symbol)))
198 {
199 /* Symbol is not defined, so no need to worry about it. */
200 return bfd_reloc_continue;
201 }
202
203 if (bfd_is_com_section (bfd_get_section (symbol)))
204 {
205 /* I don't really know what the right action is for a common
206 symbol. */
207 return bfd_reloc_continue;
208 }
209
210 /* Convert the reloc to use the section symbol. FIXME: This method
211 is ridiculous. */
212 osec = bfd_get_section (symbol)->output_section;
213 if (coff_section_data (output_bfd, osec) != NULL
214 && coff_section_data (output_bfd, osec)->tdata != NULL)
215 reloc_entry->sym_ptr_ptr =
216 (asymbol **) coff_section_data (output_bfd, osec)->tdata;
217 else
218 {
219 const char *sec_name;
220 asymbol **syms, **sym_end;
221
222 sec_name = bfd_get_section_name (output_bfd, osec);
223 syms = bfd_get_outsymbols (output_bfd);
224 sym_end = syms + bfd_get_symcount (output_bfd);
225 for (; syms < sym_end; syms++)
226 {
227 if (bfd_asymbol_name (*syms) != NULL
228 && (*syms)->value == 0
229 && strcmp ((*syms)->section->output_section->name,
230 sec_name) == 0)
231 break;
232 }
233
234 if (syms >= sym_end)
235 abort ();
236
237 reloc_entry->sym_ptr_ptr = syms;
238
239 if (coff_section_data (output_bfd, osec) == NULL)
240 {
241 bfd_size_type amt = sizeof (struct coff_section_tdata);
242 osec->used_by_bfd = bfd_zalloc (abfd, amt);
243 if (osec->used_by_bfd == NULL)
244 return bfd_reloc_overflow;
245 }
246 coff_section_data (output_bfd, osec)->tdata = syms;
247 }
248
249 /* Let bfd_perform_relocation do its thing, which will include
250 stuffing the symbol addend into the object file. */
251 return bfd_reloc_continue;
252 }
253
254 static reloc_howto_type howto_rellong =
255 HOWTO ((unsigned int) R_RELLONG, 0, 2, 32,FALSE, 0,
256 complain_overflow_bitfield, coff_i960_relocate,"rellong", TRUE,
257 0xffffffff, 0xffffffff, 0);
258 static reloc_howto_type howto_iprmed =
259 HOWTO (R_IPRMED, 0, 2, 24,TRUE,0, complain_overflow_signed,
260 coff_i960_relocate, "iprmed ", TRUE, 0x00ffffff, 0x00ffffff, 0);
261 static reloc_howto_type howto_optcall =
262 HOWTO (R_OPTCALL, 0,2,24,TRUE,0, complain_overflow_signed,
263 optcall_callback, "optcall", TRUE, 0x00ffffff, 0x00ffffff, 0);
264
265 static reloc_howto_type *
266 coff_i960_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
267 bfd_reloc_code_real_type code)
268 {
269 switch (code)
270 {
271 default:
272 return 0;
273 case BFD_RELOC_I960_CALLJ:
274 return &howto_optcall;
275 case BFD_RELOC_32:
276 case BFD_RELOC_CTOR:
277 return &howto_rellong;
278 case BFD_RELOC_24_PCREL:
279 return &howto_iprmed;
280 }
281 }
282
283 static reloc_howto_type *
284 coff_i960_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
285 const char *r_name)
286 {
287 if (strcasecmp (howto_optcall.name, r_name) == 0)
288 return &howto_optcall;
289 if (strcasecmp (howto_rellong.name, r_name) == 0)
290 return &howto_rellong;
291 if (strcasecmp (howto_iprmed.name, r_name) == 0)
292 return &howto_iprmed;
293
294 return NULL;
295 }
296
297 /* The real code is in coffcode.h */
298
299 #define RTYPE2HOWTO(cache_ptr, dst) \
300 { \
301 reloc_howto_type *howto_ptr; \
302 switch ((dst)->r_type) { \
303 case 17: howto_ptr = &howto_rellong; break; \
304 case 25: howto_ptr = &howto_iprmed; break; \
305 case 27: howto_ptr = &howto_optcall; break; \
306 default: howto_ptr = 0; break; \
307 } \
308 (cache_ptr)->howto = howto_ptr; \
309 }
310
311 /* i960 COFF is used by VxWorks 5.1. However, VxWorks 5.1 does not
312 appear to correctly handle a reloc against a symbol defined in the
313 same object file. It appears to simply discard such relocs, rather
314 than adding their values into the object file. We handle this by
315 converting all relocs against global symbols into relocs against
316 internal symbols at the start of the section. This routine is
317 called at the start of the linking process, and it creates the
318 necessary symbols. */
319
320 static bfd_boolean
321 coff_i960_start_final_link (bfd *abfd, struct bfd_link_info *info)
322 {
323 bfd_size_type symesz = bfd_coff_symesz (abfd);
324 asection *o;
325 bfd_byte *esym;
326
327 if (! info->relocatable)
328 return TRUE;
329
330 esym = (bfd_byte *) bfd_malloc (symesz);
331 if (esym == NULL)
332 return FALSE;
333
334 if (bfd_seek (abfd, obj_sym_filepos (abfd), SEEK_SET) != 0)
335 return FALSE;
336
337 for (o = abfd->sections; o != NULL; o = o->next)
338 {
339 struct internal_syment isym;
340
341 strncpy (isym._n._n_name, o->name, SYMNMLEN);
342 isym.n_value = 0;
343 isym.n_scnum = o->target_index;
344 isym.n_type = T_NULL;
345 isym.n_sclass = C_STAT;
346 isym.n_numaux = 0;
347
348 bfd_coff_swap_sym_out (abfd, &isym, esym);
349
350 if (bfd_bwrite (esym, symesz, abfd) != symesz)
351 {
352 free (esym);
353 return FALSE;
354 }
355
356 obj_raw_syment_count (abfd) += 1;
357 }
358
359 free (esym);
360
361 return TRUE;
362 }
363
364 /* The reloc processing routine for the optimized COFF linker. */
365
366 static bfd_boolean
367 coff_i960_relocate_section (bfd *output_bfd ATTRIBUTE_UNUSED,
368 struct bfd_link_info *info,
369 bfd *input_bfd,
370 asection *input_section,
371 bfd_byte *contents,
372 struct internal_reloc *relocs,
373 struct internal_syment *syms,
374 asection **sections)
375 {
376 struct internal_reloc *rel;
377 struct internal_reloc *relend;
378
379 rel = relocs;
380 relend = rel + input_section->reloc_count;
381 for (; rel < relend; rel++)
382 {
383 long symndx;
384 struct coff_link_hash_entry *h;
385 struct internal_syment *sym;
386 bfd_vma addend;
387 bfd_vma val;
388 reloc_howto_type *howto;
389 bfd_reloc_status_type rstat = bfd_reloc_ok;
390 bfd_boolean done;
391
392 symndx = rel->r_symndx;
393
394 if (symndx == -1)
395 {
396 h = NULL;
397 sym = NULL;
398 }
399 else
400 {
401 h = obj_coff_sym_hashes (input_bfd)[symndx];
402 sym = syms + symndx;
403 }
404
405 if (sym != NULL && sym->n_scnum != 0)
406 addend = - sym->n_value;
407 else
408 addend = 0;
409
410 switch (rel->r_type)
411 {
412 case 17: howto = &howto_rellong; break;
413 case 25: howto = &howto_iprmed; break;
414 case 27: howto = &howto_optcall; break;
415 default:
416 bfd_set_error (bfd_error_bad_value);
417 return FALSE;
418 }
419
420 val = 0;
421
422 if (h == NULL)
423 {
424 asection *sec;
425
426 if (symndx == -1)
427 {
428 sec = bfd_abs_section_ptr;
429 val = 0;
430 }
431 else
432 {
433 sec = sections[symndx];
434 val = (sec->output_section->vma
435 + sec->output_offset
436 + sym->n_value
437 - sec->vma);
438 }
439 }
440 else
441 {
442 if (h->root.type == bfd_link_hash_defined
443 || h->root.type == bfd_link_hash_defweak)
444 {
445 asection *sec;
446
447 sec = h->root.u.def.section;
448 val = (h->root.u.def.value
449 + sec->output_section->vma
450 + sec->output_offset);
451 }
452 else if (! info->relocatable)
453 {
454 if (! ((*info->callbacks->undefined_symbol)
455 (info, h->root.root.string, input_bfd, input_section,
456 rel->r_vaddr - input_section->vma, TRUE)))
457 return FALSE;
458 }
459 }
460
461 done = FALSE;
462
463 if (howto->type == R_OPTCALL && ! info->relocatable && symndx != -1)
464 {
465 int class_val;
466
467 if (h != NULL)
468 class_val = h->symbol_class;
469 else
470 class_val = sym->n_sclass;
471
472 switch (class_val)
473 {
474 case C_NULL:
475 /* This symbol is apparently not from a COFF input file.
476 We warn, and then assume that it is not a leaf
477 function. */
478 if (! ((*info->callbacks->reloc_dangerous)
479 (info,
480 _("uncertain calling convention for non-COFF symbol"),
481 input_bfd, input_section,
482 rel->r_vaddr - input_section->vma)))
483 return FALSE;
484 break;
485 case C_LEAFSTAT:
486 case C_LEAFEXT:
487 /* This is a call to a leaf procedure; use the bal
488 instruction. */
489 {
490 long olf;
491 unsigned long word;
492
493 if (h != NULL)
494 {
495 BFD_ASSERT (h->numaux == 2);
496 olf = h->aux[1].x_bal.x_balntry;
497 }
498 else
499 {
500 bfd_byte *esyms;
501 union internal_auxent aux;
502
503 BFD_ASSERT (sym->n_numaux == 2);
504 esyms = (bfd_byte *) obj_coff_external_syms (input_bfd);
505 esyms += (symndx + 2) * bfd_coff_symesz (input_bfd);
506 bfd_coff_swap_aux_in (input_bfd, esyms, sym->n_type,
507 sym->n_sclass, 1, sym->n_numaux,
508 &aux);
509 olf = aux.x_bal.x_balntry;
510 }
511
512 word = bfd_get_32 (input_bfd,
513 (contents
514 + (rel->r_vaddr - input_section->vma)));
515 word = ((word + olf - val) & BAL_MASK) | BAL;
516 bfd_put_32 (input_bfd,
517 (bfd_vma) word,
518 contents + (rel->r_vaddr - input_section->vma));
519 done = TRUE;
520 }
521 break;
522 case C_SCALL:
523 BFD_ASSERT (0);
524 break;
525 }
526 }
527
528 if (! done)
529 {
530 if (howto->pc_relative)
531 addend += input_section->vma;
532 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
533 contents,
534 rel->r_vaddr - input_section->vma,
535 val, addend);
536 }
537
538 switch (rstat)
539 {
540 default:
541 abort ();
542 case bfd_reloc_ok:
543 break;
544 case bfd_reloc_overflow:
545 {
546 const char *name;
547 char buf[SYMNMLEN + 1];
548
549 if (symndx == -1)
550 name = "*ABS*";
551 else if (h != NULL)
552 name = NULL;
553 else
554 {
555 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
556 if (name == NULL)
557 return FALSE;
558 }
559
560 if (! ((*info->callbacks->reloc_overflow)
561 (info, (h ? &h->root : NULL), name, howto->name,
562 (bfd_vma) 0, input_bfd, input_section,
563 rel->r_vaddr - input_section->vma)))
564 return FALSE;
565 }
566 }
567 }
568
569 return TRUE;
570 }
571
572 /* Adjust the symbol index of any reloc against a global symbol to
573 instead be a reloc against the internal symbol we created specially
574 for the section. */
575
576 static bfd_boolean
577 coff_i960_adjust_symndx (bfd *obfd ATTRIBUTE_UNUSED,
578 struct bfd_link_info *info ATTRIBUTE_UNUSED,
579 bfd *ibfd,
580 asection *sec ATTRIBUTE_UNUSED,
581 struct internal_reloc *irel,
582 bfd_boolean *adjustedp)
583 {
584 struct coff_link_hash_entry *h;
585
586 *adjustedp = FALSE;
587
588 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
589 if (h == NULL
590 || (h->root.type != bfd_link_hash_defined
591 && h->root.type != bfd_link_hash_defweak))
592 return TRUE;
593
594 irel->r_symndx = h->root.u.def.section->output_section->target_index - 1;
595 *adjustedp = TRUE;
596
597 return TRUE;
598 }
599
600 #define coff_bfd_is_local_label_name coff_i960_is_local_label_name
601
602 #define coff_start_final_link coff_i960_start_final_link
603
604 #define coff_relocate_section coff_i960_relocate_section
605
606 #define coff_adjust_symndx coff_i960_adjust_symndx
607
608 #define coff_bfd_reloc_type_lookup coff_i960_reloc_type_lookup
609 #define coff_bfd_reloc_name_lookup coff_i960_reloc_name_lookup
610
611 #include "coffcode.h"
612
613 extern const bfd_target icoff_big_vec;
614
615 CREATE_LITTLE_COFF_TARGET_VEC (icoff_little_vec, "coff-Intel-little", 0, 0, '_', & icoff_big_vec, COFF_SWAP_TABLE)
616
617 const bfd_target icoff_big_vec =
618 {
619 "coff-Intel-big", /* name */
620 bfd_target_coff_flavour,
621 BFD_ENDIAN_LITTLE, /* data byte order is little */
622 BFD_ENDIAN_BIG, /* header byte order is big */
623
624 (HAS_RELOC | EXEC_P | /* object flags */
625 HAS_LINENO | HAS_DEBUG |
626 HAS_SYMS | HAS_LOCALS | WP_TEXT),
627
628 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
629 '_', /* leading underscore */
630 '/', /* ar_pad_char */
631 15, /* ar_max_namelen */
632 0, /* match priority. */
633
634 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
635 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
636 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
637 bfd_getb64, bfd_getb_signed_64, bfd_putb64,
638 bfd_getb32, bfd_getb_signed_32, bfd_putb32,
639 bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */
640
641 {_bfd_dummy_target, coff_object_p, /* bfd_check_format */
642 bfd_generic_archive_p, _bfd_dummy_target},
643 {bfd_false, coff_mkobject, /* bfd_set_format */
644 _bfd_generic_mkarchive, bfd_false},
645 {bfd_false, coff_write_object_contents, /* bfd_write_contents */
646 _bfd_write_archive_contents, bfd_false},
647
648 BFD_JUMP_TABLE_GENERIC (coff),
649 BFD_JUMP_TABLE_COPY (coff),
650 BFD_JUMP_TABLE_CORE (_bfd_nocore),
651 BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
652 BFD_JUMP_TABLE_SYMBOLS (coff),
653 BFD_JUMP_TABLE_RELOCS (coff),
654 BFD_JUMP_TABLE_WRITE (coff),
655 BFD_JUMP_TABLE_LINK (coff),
656 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
657
658 & icoff_little_vec,
659
660 COFF_SWAP_TABLE
661 };
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