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[deliverable/binutils-gdb.git] / bfd / coff-i960.c
1 /* BFD back-end for Intel 960 COFF files.
2 Copyright (C) 1990, 91, 92, 93, 94, 1995 Free Software Foundation, Inc.
3 Written by Cygnus Support.
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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20
21 #define I960 1
22 #define BADMAG(x) I960BADMAG(x)
23
24 #include "bfd.h"
25 #include "sysdep.h"
26 #include "libbfd.h"
27 #include "obstack.h"
28 #include "coff/i960.h"
29 #include "coff/internal.h"
30 #include "libcoff.h" /* to allow easier abstraction-breaking */
31
32 static bfd_reloc_status_type optcall_callback
33 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
34 static bfd_reloc_status_type coff_i960_relocate
35 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
36 static reloc_howto_type *coff_i960_reloc_type_lookup
37 PARAMS ((bfd *, bfd_reloc_code_real_type));
38 static boolean coff_i960_start_final_link
39 PARAMS ((bfd *, struct bfd_link_info *));
40 static boolean coff_i960_relocate_section
41 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
42 struct internal_reloc *, struct internal_syment *, asection **));
43 static boolean coff_i960_adjust_symndx
44 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *,
45 struct internal_reloc *, boolean *));
46
47 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (3)
48
49 /* The i960 does not support an MMU, so COFF_PAGE_SIZE can be
50 arbitrarily small. */
51 #define COFF_PAGE_SIZE 1
52
53 #define COFF_LONG_FILENAMES
54
55 #define CALLS 0x66003800 /* Template for 'calls' instruction */
56 #define BAL 0x0b000000 /* Template for 'bal' instruction */
57 #define BAL_MASK 0x00ffffff
58
59 static bfd_reloc_status_type
60 optcall_callback (abfd, reloc_entry, symbol_in, data,
61 input_section, ignore_bfd, error_message)
62 bfd *abfd;
63 arelent *reloc_entry;
64 asymbol *symbol_in;
65 PTR data;
66 asection *input_section;
67 bfd *ignore_bfd;
68 char **error_message;
69 {
70 /* This item has already been relocated correctly, but we may be
71 * able to patch in yet better code - done by digging out the
72 * correct info on this symbol */
73 bfd_reloc_status_type result;
74 coff_symbol_type *cs = coffsymbol(symbol_in);
75
76 /* Don't do anything with symbols which aren't tied up yet,
77 except move the reloc. */
78 if (bfd_is_und_section (cs->symbol.section)) {
79 reloc_entry->address += input_section->output_offset;
80 return bfd_reloc_ok;
81 }
82
83 /* So the target symbol has to be of coff type, and the symbol
84 has to have the correct native information within it */
85 if ((bfd_asymbol_flavour(&cs->symbol) != bfd_target_coff_flavour)
86 || (cs->native == (combined_entry_type *)NULL))
87 {
88 /* This is interesting, consider the case where we're outputting coff
89 from a mix n match input, linking from coff to a symbol defined in a
90 bout file will cause this match to be true. Should I complain? This
91 will only work if the bout symbol is non leaf. */
92 *error_message =
93 (char *) "uncertain calling convention for non-COFF symbol";
94 result = bfd_reloc_dangerous;
95 }
96 else
97 {
98 switch (cs->native->u.syment.n_sclass)
99 {
100 case C_LEAFSTAT:
101 case C_LEAFEXT:
102 /* This is a call to a leaf procedure, replace instruction with a bal
103 to the correct location. */
104 {
105 union internal_auxent *aux = &((cs->native+2)->u.auxent);
106 int word = bfd_get_32(abfd, (bfd_byte *)data + reloc_entry->address);
107 int olf = (aux->x_bal.x_balntry - cs->native->u.syment.n_value);
108 BFD_ASSERT(cs->native->u.syment.n_numaux==2);
109
110 /* We replace the original call instruction with a bal to
111 the bal entry point - the offset of which is described in
112 the 2nd auxent of the original symbol. We keep the native
113 sym and auxents untouched, so the delta between the two
114 is the offset of the bal entry point. */
115 word = ((word + olf) & BAL_MASK) | BAL;
116 bfd_put_32(abfd, word, (bfd_byte *) data + reloc_entry->address);
117 }
118 result = bfd_reloc_ok;
119 break;
120 case C_SCALL:
121 /* This is a call to a system call, replace with a calls to # */
122 BFD_ASSERT(0);
123 result = bfd_reloc_ok;
124 break;
125 default:
126 result = bfd_reloc_ok;
127 break;
128 }
129 }
130 return result;
131 }
132
133 /* i960 COFF is used by VxWorks 5.1. However, VxWorks 5.1 does not
134 appear to correctly handle a reloc against a symbol defined in the
135 same object file. It appears to simply discard such relocs, rather
136 than adding their values into the object file. We handle this here
137 by converting all relocs against defined symbols into relocs
138 against the section symbol, when generating a relocateable output
139 file.
140
141 Note that this function is only called if we are not using the COFF
142 specific backend linker. It only does something when doing a
143 relocateable link, which will almost certainly fail when not
144 generating COFF i960 output, so this function is actually no longer
145 useful. It was used before this target was converted to use the
146 COFF specific backend linker. */
147
148 static bfd_reloc_status_type
149 coff_i960_relocate (abfd, reloc_entry, symbol, data, input_section,
150 output_bfd, error_message)
151 bfd *abfd;
152 arelent *reloc_entry;
153 asymbol *symbol;
154 PTR data;
155 asection *input_section;
156 bfd *output_bfd;
157 char **error_message;
158 {
159 asection *osec;
160
161 if (output_bfd == NULL)
162 {
163 /* Not generating relocateable output file. */
164 return bfd_reloc_continue;
165 }
166
167 if (bfd_is_und_section (bfd_get_section (symbol)))
168 {
169 /* Symbol is not defined, so no need to worry about it. */
170 return bfd_reloc_continue;
171 }
172
173 if (bfd_is_com_section (bfd_get_section (symbol)))
174 {
175 /* I don't really know what the right action is for a common
176 symbol. */
177 return bfd_reloc_continue;
178 }
179
180 /* Convert the reloc to use the section symbol. FIXME: This method
181 is ridiculous. */
182 osec = bfd_get_section (symbol)->output_section;
183 if (coff_section_data (output_bfd, osec) != NULL
184 && coff_section_data (output_bfd, osec)->tdata != NULL)
185 reloc_entry->sym_ptr_ptr =
186 (asymbol **) coff_section_data (output_bfd, osec)->tdata;
187 else
188 {
189 const char *sec_name;
190 asymbol **syms, **sym_end;
191
192 sec_name = bfd_get_section_name (output_bfd, osec);
193 syms = bfd_get_outsymbols (output_bfd);
194 sym_end = syms + bfd_get_symcount (output_bfd);
195 for (; syms < sym_end; syms++)
196 {
197 if (bfd_asymbol_name (*syms) != NULL
198 && (*syms)->value == 0
199 && strcmp ((*syms)->section->output_section->name,
200 sec_name) == 0)
201 break;
202 }
203
204 if (syms >= sym_end)
205 abort ();
206
207 reloc_entry->sym_ptr_ptr = syms;
208
209 if (coff_section_data (output_bfd, osec) == NULL)
210 {
211 osec->used_by_bfd =
212 ((PTR) bfd_zalloc (abfd,
213 sizeof (struct coff_section_tdata)));
214 if (osec->used_by_bfd == NULL)
215 return bfd_reloc_overflow;
216 }
217 coff_section_data (output_bfd, osec)->tdata = (PTR) syms;
218 }
219
220 /* Let bfd_perform_relocation do its thing, which will include
221 stuffing the symbol addend into the object file. */
222 return bfd_reloc_continue;
223 }
224
225 static reloc_howto_type howto_rellong =
226 HOWTO ((unsigned int) R_RELLONG, 0, 2, 32,false, 0,
227 complain_overflow_bitfield, coff_i960_relocate,"rellong", true,
228 0xffffffff, 0xffffffff, 0);
229 static reloc_howto_type howto_iprmed =
230 HOWTO (R_IPRMED, 0, 2, 24,true,0, complain_overflow_signed,
231 coff_i960_relocate, "iprmed ", true, 0x00ffffff, 0x00ffffff, 0);
232 static reloc_howto_type howto_optcall =
233 HOWTO (R_OPTCALL, 0,2,24,true,0, complain_overflow_signed,
234 optcall_callback, "optcall", true, 0x00ffffff, 0x00ffffff, 0);
235
236 static reloc_howto_type *
237 coff_i960_reloc_type_lookup (abfd, code)
238 bfd *abfd;
239 bfd_reloc_code_real_type code;
240 {
241 switch (code)
242 {
243 default:
244 return 0;
245 case BFD_RELOC_I960_CALLJ:
246 return &howto_optcall;
247 case BFD_RELOC_32:
248 case BFD_RELOC_CTOR:
249 return &howto_rellong;
250 case BFD_RELOC_24_PCREL:
251 return &howto_iprmed;
252 }
253 }
254
255 /* The real code is in coffcode.h */
256
257 #define RTYPE2HOWTO(cache_ptr, dst) \
258 { \
259 reloc_howto_type *howto_ptr; \
260 switch ((dst)->r_type) { \
261 case 17: howto_ptr = &howto_rellong; break; \
262 case 25: howto_ptr = &howto_iprmed; break; \
263 case 27: howto_ptr = &howto_optcall; break; \
264 default: howto_ptr = 0; break; \
265 } \
266 (cache_ptr)->howto = howto_ptr; \
267 }
268
269 /* i960 COFF is used by VxWorks 5.1. However, VxWorks 5.1 does not
270 appear to correctly handle a reloc against a symbol defined in the
271 same object file. It appears to simply discard such relocs, rather
272 than adding their values into the object file. We handle this by
273 converting all relocs against global symbols into relocs against
274 internal symbols at the start of the section. This routine is
275 called at the start of the linking process, and it creates the
276 necessary symbols. */
277
278 static boolean
279 coff_i960_start_final_link (abfd, info)
280 bfd *abfd;
281 struct bfd_link_info *info;
282 {
283 bfd_size_type symesz = bfd_coff_symesz (abfd);
284 asection *o;
285 bfd_byte *esym;
286
287 if (! info->relocateable)
288 return true;
289
290 esym = (bfd_byte *) bfd_malloc (symesz);
291 if (esym == NULL)
292 return false;
293
294 if (bfd_seek (abfd, obj_sym_filepos (abfd), SEEK_SET) != 0)
295 return false;
296
297 for (o = abfd->sections; o != NULL; o = o->next)
298 {
299 struct internal_syment isym;
300
301 strncpy (isym._n._n_name, o->name, SYMNMLEN);
302 isym.n_value = 0;
303 isym.n_scnum = o->target_index;
304 isym.n_type = T_NULL;
305 isym.n_sclass = C_STAT;
306 isym.n_numaux = 0;
307
308 bfd_coff_swap_sym_out (abfd, (PTR) &isym, (PTR) esym);
309
310 if (bfd_write (esym, symesz, 1, abfd) != symesz)
311 {
312 free (esym);
313 return false;
314 }
315
316 obj_raw_syment_count (abfd) += 1;
317 }
318
319 free (esym);
320
321 return true;
322 }
323
324 /* The reloc processing routine for the optimized COFF linker. */
325
326 static boolean
327 coff_i960_relocate_section (output_bfd, info, input_bfd, input_section,
328 contents, relocs, syms, sections)
329 bfd *output_bfd;
330 struct bfd_link_info *info;
331 bfd *input_bfd;
332 asection *input_section;
333 bfd_byte *contents;
334 struct internal_reloc *relocs;
335 struct internal_syment *syms;
336 asection **sections;
337 {
338 struct internal_reloc *rel;
339 struct internal_reloc *relend;
340
341 rel = relocs;
342 relend = rel + input_section->reloc_count;
343 for (; rel < relend; rel++)
344 {
345 long symndx;
346 struct coff_link_hash_entry *h;
347 struct internal_syment *sym;
348 bfd_vma addend;
349 bfd_vma val;
350 reloc_howto_type *howto;
351 bfd_reloc_status_type rstat = bfd_reloc_ok;
352 boolean done;
353
354 symndx = rel->r_symndx;
355
356 if (symndx == -1)
357 {
358 h = NULL;
359 sym = NULL;
360 }
361 else
362 {
363 h = obj_coff_sym_hashes (input_bfd)[symndx];
364 sym = syms + symndx;
365 }
366
367 if (sym != NULL && sym->n_scnum != 0)
368 addend = - sym->n_value;
369 else
370 addend = 0;
371
372 switch (rel->r_type)
373 {
374 case 17: howto = &howto_rellong; break;
375 case 25: howto = &howto_iprmed; break;
376 case 27: howto = &howto_optcall; break;
377 default:
378 bfd_set_error (bfd_error_bad_value);
379 return false;
380 }
381
382 val = 0;
383
384 if (h == NULL)
385 {
386 asection *sec;
387
388 if (symndx == -1)
389 {
390 sec = bfd_abs_section_ptr;
391 val = 0;
392 }
393 else
394 {
395 sec = sections[symndx];
396 val = (sec->output_section->vma
397 + sec->output_offset
398 + sym->n_value
399 - sec->vma);
400 }
401 }
402 else
403 {
404 if (h->root.type == bfd_link_hash_defined
405 || h->root.type == bfd_link_hash_defweak)
406 {
407 asection *sec;
408
409 sec = h->root.u.def.section;
410 val = (h->root.u.def.value
411 + sec->output_section->vma
412 + sec->output_offset);
413 }
414 else if (! info->relocateable)
415 {
416 if (! ((*info->callbacks->undefined_symbol)
417 (info, h->root.root.string, input_bfd, input_section,
418 rel->r_vaddr - input_section->vma)))
419 return false;
420 }
421 }
422
423 done = false;
424
425 if (howto->type == R_OPTCALL && ! info->relocateable && symndx != -1)
426 {
427 int class;
428
429 if (h != NULL)
430 class = h->class;
431 else
432 class = sym->n_sclass;
433
434 switch (class)
435 {
436 case C_NULL:
437 /* This symbol is apparently not from a COFF input file.
438 We warn, and then assume that it is not a leaf
439 function. */
440 if (! ((*info->callbacks->reloc_dangerous)
441 (info,
442 "uncertain calling convention for non-COFF symbol",
443 input_bfd, input_section,
444 rel->r_vaddr - input_section->vma)))
445 return false;
446 break;
447 case C_LEAFSTAT:
448 case C_LEAFEXT:
449 /* This is a call to a leaf procedure; use the bal
450 instruction. */
451 {
452 long olf;
453 unsigned long word;
454
455 if (h != NULL)
456 {
457 BFD_ASSERT (h->numaux == 2);
458 olf = h->aux[1].x_bal.x_balntry;
459 }
460 else
461 {
462 bfd_byte *esyms;
463 union internal_auxent aux;
464
465 BFD_ASSERT (sym->n_numaux == 2);
466 esyms = (bfd_byte *) obj_coff_external_syms (input_bfd);
467 esyms += (symndx + 2) * bfd_coff_symesz (input_bfd);
468 bfd_coff_swap_aux_in (input_bfd, (PTR) esyms, sym->n_type,
469 sym->n_sclass, 1, sym->n_numaux,
470 (PTR) &aux);
471 olf = aux.x_bal.x_balntry;
472 }
473
474 word = bfd_get_32 (input_bfd,
475 (contents
476 + (rel->r_vaddr - input_section->vma)));
477 word = ((word + olf - val) & BAL_MASK) | BAL;
478 bfd_put_32 (input_bfd,
479 word,
480 (contents
481 + (rel->r_vaddr - input_section->vma)));
482 done = true;
483 }
484 break;
485 case C_SCALL:
486 BFD_ASSERT (0);
487 break;
488 }
489 }
490
491 if (! done)
492 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
493 contents,
494 rel->r_vaddr - input_section->vma,
495 val, addend);
496
497 switch (rstat)
498 {
499 default:
500 abort ();
501 case bfd_reloc_ok:
502 break;
503 case bfd_reloc_overflow:
504 {
505 const char *name;
506 char buf[SYMNMLEN + 1];
507
508 if (symndx == -1)
509 name = "*ABS*";
510 else if (h != NULL)
511 name = h->root.root.string;
512 else
513 {
514 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
515 if (name == NULL)
516 return false;
517 }
518
519 if (! ((*info->callbacks->reloc_overflow)
520 (info, name, howto->name, (bfd_vma) 0, input_bfd,
521 input_section, rel->r_vaddr - input_section->vma)))
522 return false;
523 }
524 }
525 }
526
527 return true;
528 }
529
530 /* Adjust the symbol index of any reloc against a global symbol to
531 instead be a reloc against the internal symbol we created specially
532 for the section. */
533
534 /*ARGSUSED*/
535 static boolean
536 coff_i960_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp)
537 bfd *obfd;
538 struct bfd_link_info *info;
539 bfd *ibfd;
540 asection *sec;
541 struct internal_reloc *irel;
542 boolean *adjustedp;
543 {
544 struct coff_link_hash_entry *h;
545
546 *adjustedp = false;
547
548 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
549 if (h == NULL
550 || (h->root.type != bfd_link_hash_defined
551 && h->root.type != bfd_link_hash_defweak))
552 return true;
553
554 irel->r_symndx = h->root.u.def.section->output_section->target_index - 1;
555 *adjustedp = true;
556
557 return true;
558 }
559
560 #define coff_start_final_link coff_i960_start_final_link
561
562 #define coff_relocate_section coff_i960_relocate_section
563
564 #define coff_adjust_symndx coff_i960_adjust_symndx
565
566 #define coff_bfd_reloc_type_lookup coff_i960_reloc_type_lookup
567
568 #include "coffcode.h"
569
570 const bfd_target icoff_little_vec =
571 {
572 "coff-Intel-little", /* name */
573 bfd_target_coff_flavour,
574 false, /* data byte order is little */
575 false, /* header byte order is little */
576
577 (HAS_RELOC | EXEC_P | /* object flags */
578 HAS_LINENO | HAS_DEBUG |
579 HAS_SYMS | HAS_LOCALS | WP_TEXT),
580
581 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
582 '_', /* leading underscore */
583 '/', /* ar_pad_char */
584 15, /* ar_max_namelen */
585
586 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
587 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
588 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
589 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
590 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
591 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
592
593 {_bfd_dummy_target, coff_object_p, /* bfd_check_format */
594 bfd_generic_archive_p, _bfd_dummy_target},
595 {bfd_false, coff_mkobject, /* bfd_set_format */
596 _bfd_generic_mkarchive, bfd_false},
597 {bfd_false, coff_write_object_contents, /* bfd_write_contents */
598 _bfd_write_archive_contents, bfd_false},
599
600 BFD_JUMP_TABLE_GENERIC (coff),
601 BFD_JUMP_TABLE_COPY (coff),
602 BFD_JUMP_TABLE_CORE (_bfd_nocore),
603 BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
604 BFD_JUMP_TABLE_SYMBOLS (coff),
605 BFD_JUMP_TABLE_RELOCS (coff),
606 BFD_JUMP_TABLE_WRITE (coff),
607 BFD_JUMP_TABLE_LINK (coff),
608 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
609
610 COFF_SWAP_TABLE,
611 };
612
613
614 const bfd_target icoff_big_vec =
615 {
616 "coff-Intel-big", /* name */
617 bfd_target_coff_flavour,
618 false, /* data byte order is little */
619 true, /* header byte order is big */
620
621 (HAS_RELOC | EXEC_P | /* object flags */
622 HAS_LINENO | HAS_DEBUG |
623 HAS_SYMS | HAS_LOCALS | WP_TEXT),
624
625 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
626 '_', /* leading underscore */
627 '/', /* ar_pad_char */
628 15, /* ar_max_namelen */
629
630 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
631 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
632 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
633 bfd_getb64, bfd_getb_signed_64, bfd_putb64,
634 bfd_getb32, bfd_getb_signed_32, bfd_putb32,
635 bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */
636
637 {_bfd_dummy_target, coff_object_p, /* bfd_check_format */
638 bfd_generic_archive_p, _bfd_dummy_target},
639 {bfd_false, coff_mkobject, /* bfd_set_format */
640 _bfd_generic_mkarchive, bfd_false},
641 {bfd_false, coff_write_object_contents, /* bfd_write_contents */
642 _bfd_write_archive_contents, bfd_false},
643
644 BFD_JUMP_TABLE_GENERIC (coff),
645 BFD_JUMP_TABLE_COPY (coff),
646 BFD_JUMP_TABLE_CORE (_bfd_nocore),
647 BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
648 BFD_JUMP_TABLE_SYMBOLS (coff),
649 BFD_JUMP_TABLE_RELOCS (coff),
650 BFD_JUMP_TABLE_WRITE (coff),
651 BFD_JUMP_TABLE_LINK (coff),
652 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
653
654 COFF_SWAP_TABLE,
655 };
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