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
4 Free Software Foundation, Inc.
5 Written by Cygnus Support.
7 This file is part of BFD, the Binary File Descriptor library.
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.
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.
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. */
25 #define BADMAG(x) I960BADMAG(x)
30 #include "coff/i960.h"
31 #include "coff/internal.h"
33 #ifndef bfd_pe_print_pdata
34 #define bfd_pe_print_pdata NULL
37 #include "libcoff.h" /* To allow easier abstraction-breaking. */
39 static bfd_boolean coff_i960_is_local_label_name
40 PARAMS ((bfd *, const char *));
41 static bfd_reloc_status_type optcall_callback
42 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
43 static bfd_reloc_status_type coff_i960_relocate
44 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
45 static reloc_howto_type *coff_i960_reloc_type_lookup
46 PARAMS ((bfd *, bfd_reloc_code_real_type));
47 static bfd_boolean coff_i960_start_final_link
48 PARAMS ((bfd *, struct bfd_link_info *));
49 static bfd_boolean coff_i960_relocate_section
50 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
51 struct internal_reloc *, struct internal_syment *, asection **));
52 static bfd_boolean coff_i960_adjust_symndx
53 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *,
54 struct internal_reloc *, bfd_boolean *));
56 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (3)
57 #define COFF_ALIGN_IN_SECTION_HEADER 1
59 #define GET_SCNHDR_ALIGN H_GET_32
60 #define PUT_SCNHDR_ALIGN H_PUT_32
62 /* The i960 does not support an MMU, so COFF_PAGE_SIZE can be
64 #define COFF_PAGE_SIZE 1
66 #define COFF_LONG_FILENAMES
68 /* This set of local label names is taken from gas. */
71 coff_i960_is_local_label_name (abfd, name)
72 bfd *abfd ATTRIBUTE_UNUSED;
75 return (name[0] == 'L'
82 /* This is just like the usual CALC_ADDEND, but it includes the
83 section VMA for PC relative relocs. */
85 #define CALC_ADDEND(abfd, ptr, reloc, cache_ptr) \
87 coff_symbol_type *coffsym = (coff_symbol_type *) NULL; \
88 if (ptr && bfd_asymbol_bfd (ptr) != abfd) \
89 coffsym = (obj_symbols (abfd) \
90 + (cache_ptr->sym_ptr_ptr - symbols)); \
92 coffsym = coff_symbol_from (abfd, ptr); \
93 if (coffsym != (coff_symbol_type *) NULL \
94 && coffsym->native->u.syment.n_scnum == 0) \
95 cache_ptr->addend = 0; \
96 else if (ptr && bfd_asymbol_bfd (ptr) == abfd \
97 && ptr->section != (asection *) NULL) \
98 cache_ptr->addend = - (ptr->section->vma + ptr->value); \
100 cache_ptr->addend = 0; \
101 if (ptr && (reloc.r_type == 25 || reloc.r_type == 27)) \
102 cache_ptr->addend += asect->vma; \
106 #define CALLS 0x66003800 /* Template for 'calls' instruction */
107 #define BAL 0x0b000000 /* Template for 'bal' instruction */
108 #define BAL_MASK 0x00ffffff
110 static bfd_reloc_status_type
111 optcall_callback (abfd, reloc_entry, symbol_in, data,
112 input_section, ignore_bfd, error_message)
114 arelent *reloc_entry;
117 asection *input_section;
118 bfd *ignore_bfd ATTRIBUTE_UNUSED;
119 char **error_message;
121 /* This item has already been relocated correctly, but we may be
122 * able to patch in yet better code - done by digging out the
123 * correct info on this symbol */
124 bfd_reloc_status_type result;
125 coff_symbol_type *cs = coffsymbol(symbol_in);
127 /* Don't do anything with symbols which aren't tied up yet,
128 except move the reloc. */
129 if (bfd_is_und_section (cs->symbol.section)) {
130 reloc_entry->address += input_section->output_offset;
134 /* So the target symbol has to be of coff type, and the symbol
135 has to have the correct native information within it */
136 if ((bfd_asymbol_flavour(&cs->symbol) != bfd_target_coff_flavour)
137 || (cs->native == (combined_entry_type *)NULL))
139 /* This is interesting, consider the case where we're outputting coff
140 from a mix n match input, linking from coff to a symbol defined in a
141 bout file will cause this match to be true. Should I complain? This
142 will only work if the bout symbol is non leaf. */
144 (char *) _("uncertain calling convention for non-COFF symbol");
145 result = bfd_reloc_dangerous;
149 switch (cs->native->u.syment.n_sclass)
153 /* This is a call to a leaf procedure, replace instruction with a bal
154 to the correct location. */
156 union internal_auxent *aux = &((cs->native+2)->u.auxent);
157 int word = bfd_get_32 (abfd, (bfd_byte *)data + reloc_entry->address);
158 int olf = (aux->x_bal.x_balntry - cs->native->u.syment.n_value);
159 BFD_ASSERT(cs->native->u.syment.n_numaux==2);
161 /* We replace the original call instruction with a bal to
162 the bal entry point - the offset of which is described in
163 the 2nd auxent of the original symbol. We keep the native
164 sym and auxents untouched, so the delta between the two
165 is the offset of the bal entry point. */
166 word = ((word + olf) & BAL_MASK) | BAL;
167 bfd_put_32 (abfd, (bfd_vma) word,
168 (bfd_byte *) data + reloc_entry->address);
170 result = bfd_reloc_ok;
173 /* This is a call to a system call, replace with a calls to # */
175 result = bfd_reloc_ok;
178 result = bfd_reloc_ok;
185 /* i960 COFF is used by VxWorks 5.1. However, VxWorks 5.1 does not
186 appear to correctly handle a reloc against a symbol defined in the
187 same object file. It appears to simply discard such relocs, rather
188 than adding their values into the object file. We handle this here
189 by converting all relocs against defined symbols into relocs
190 against the section symbol, when generating a relocatable output
193 Note that this function is only called if we are not using the COFF
194 specific backend linker. It only does something when doing a
195 relocatable link, which will almost certainly fail when not
196 generating COFF i960 output, so this function is actually no longer
197 useful. It was used before this target was converted to use the
198 COFF specific backend linker. */
200 static bfd_reloc_status_type
201 coff_i960_relocate (abfd, reloc_entry, symbol, data, input_section,
202 output_bfd, error_message)
204 arelent *reloc_entry;
206 PTR data ATTRIBUTE_UNUSED;
207 asection *input_section ATTRIBUTE_UNUSED;
209 char **error_message ATTRIBUTE_UNUSED;
213 if (output_bfd == NULL)
215 /* Not generating relocatable output file. */
216 return bfd_reloc_continue;
219 if (bfd_is_und_section (bfd_get_section (symbol)))
221 /* Symbol is not defined, so no need to worry about it. */
222 return bfd_reloc_continue;
225 if (bfd_is_com_section (bfd_get_section (symbol)))
227 /* I don't really know what the right action is for a common
229 return bfd_reloc_continue;
232 /* Convert the reloc to use the section symbol. FIXME: This method
234 osec = bfd_get_section (symbol)->output_section;
235 if (coff_section_data (output_bfd, osec) != NULL
236 && coff_section_data (output_bfd, osec)->tdata != NULL)
237 reloc_entry->sym_ptr_ptr =
238 (asymbol **) coff_section_data (output_bfd, osec)->tdata;
241 const char *sec_name;
242 asymbol **syms, **sym_end;
244 sec_name = bfd_get_section_name (output_bfd, osec);
245 syms = bfd_get_outsymbols (output_bfd);
246 sym_end = syms + bfd_get_symcount (output_bfd);
247 for (; syms < sym_end; syms++)
249 if (bfd_asymbol_name (*syms) != NULL
250 && (*syms)->value == 0
251 && strcmp ((*syms)->section->output_section->name,
259 reloc_entry->sym_ptr_ptr = syms;
261 if (coff_section_data (output_bfd, osec) == NULL)
263 bfd_size_type amt = sizeof (struct coff_section_tdata);
264 osec->used_by_bfd = (PTR) bfd_zalloc (abfd, amt);
265 if (osec->used_by_bfd == NULL)
266 return bfd_reloc_overflow;
268 coff_section_data (output_bfd, osec)->tdata = (PTR) syms;
271 /* Let bfd_perform_relocation do its thing, which will include
272 stuffing the symbol addend into the object file. */
273 return bfd_reloc_continue;
276 static reloc_howto_type howto_rellong =
277 HOWTO ((unsigned int) R_RELLONG, 0, 2, 32,FALSE, 0,
278 complain_overflow_bitfield, coff_i960_relocate,"rellong", TRUE,
279 0xffffffff, 0xffffffff, 0);
280 static reloc_howto_type howto_iprmed =
281 HOWTO (R_IPRMED, 0, 2, 24,TRUE,0, complain_overflow_signed,
282 coff_i960_relocate, "iprmed ", TRUE, 0x00ffffff, 0x00ffffff, 0);
283 static reloc_howto_type howto_optcall =
284 HOWTO (R_OPTCALL, 0,2,24,TRUE,0, complain_overflow_signed,
285 optcall_callback, "optcall", TRUE, 0x00ffffff, 0x00ffffff, 0);
287 static reloc_howto_type *
288 coff_i960_reloc_type_lookup (abfd, code)
289 bfd *abfd ATTRIBUTE_UNUSED;
290 bfd_reloc_code_real_type code;
296 case BFD_RELOC_I960_CALLJ:
297 return &howto_optcall;
300 return &howto_rellong;
301 case BFD_RELOC_24_PCREL:
302 return &howto_iprmed;
306 static reloc_howto_type *
307 coff_i960_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
310 if (strcasecmp (howto_optcall.name, r_name) == 0)
311 return &howto_optcall;
312 if (strcasecmp (howto_rellong.name, r_name) == 0)
313 return &howto_rellong;
314 if (strcasecmp (howto_iprmed.name, r_name) == 0)
315 return &howto_iprmed;
320 /* The real code is in coffcode.h */
322 #define RTYPE2HOWTO(cache_ptr, dst) \
324 reloc_howto_type *howto_ptr; \
325 switch ((dst)->r_type) { \
326 case 17: howto_ptr = &howto_rellong; break; \
327 case 25: howto_ptr = &howto_iprmed; break; \
328 case 27: howto_ptr = &howto_optcall; break; \
329 default: howto_ptr = 0; break; \
331 (cache_ptr)->howto = howto_ptr; \
334 /* i960 COFF is used by VxWorks 5.1. However, VxWorks 5.1 does not
335 appear to correctly handle a reloc against a symbol defined in the
336 same object file. It appears to simply discard such relocs, rather
337 than adding their values into the object file. We handle this by
338 converting all relocs against global symbols into relocs against
339 internal symbols at the start of the section. This routine is
340 called at the start of the linking process, and it creates the
341 necessary symbols. */
344 coff_i960_start_final_link (abfd, info)
346 struct bfd_link_info *info;
348 bfd_size_type symesz = bfd_coff_symesz (abfd);
352 if (! info->relocatable)
355 esym = (bfd_byte *) bfd_malloc (symesz);
359 if (bfd_seek (abfd, obj_sym_filepos (abfd), SEEK_SET) != 0)
362 for (o = abfd->sections; o != NULL; o = o->next)
364 struct internal_syment isym;
366 strncpy (isym._n._n_name, o->name, SYMNMLEN);
368 isym.n_scnum = o->target_index;
369 isym.n_type = T_NULL;
370 isym.n_sclass = C_STAT;
373 bfd_coff_swap_sym_out (abfd, (PTR) &isym, (PTR) esym);
375 if (bfd_bwrite (esym, symesz, abfd) != symesz)
381 obj_raw_syment_count (abfd) += 1;
389 /* The reloc processing routine for the optimized COFF linker. */
392 coff_i960_relocate_section (output_bfd, info, input_bfd, input_section,
393 contents, relocs, syms, sections)
394 bfd *output_bfd ATTRIBUTE_UNUSED;
395 struct bfd_link_info *info;
397 asection *input_section;
399 struct internal_reloc *relocs;
400 struct internal_syment *syms;
403 struct internal_reloc *rel;
404 struct internal_reloc *relend;
407 relend = rel + input_section->reloc_count;
408 for (; rel < relend; rel++)
411 struct coff_link_hash_entry *h;
412 struct internal_syment *sym;
415 reloc_howto_type *howto;
416 bfd_reloc_status_type rstat = bfd_reloc_ok;
419 symndx = rel->r_symndx;
428 h = obj_coff_sym_hashes (input_bfd)[symndx];
432 if (sym != NULL && sym->n_scnum != 0)
433 addend = - sym->n_value;
439 case 17: howto = &howto_rellong; break;
440 case 25: howto = &howto_iprmed; break;
441 case 27: howto = &howto_optcall; break;
443 bfd_set_error (bfd_error_bad_value);
455 sec = bfd_abs_section_ptr;
460 sec = sections[symndx];
461 val = (sec->output_section->vma
469 if (h->root.type == bfd_link_hash_defined
470 || h->root.type == bfd_link_hash_defweak)
474 sec = h->root.u.def.section;
475 val = (h->root.u.def.value
476 + sec->output_section->vma
477 + sec->output_offset);
479 else if (! info->relocatable)
481 if (! ((*info->callbacks->undefined_symbol)
482 (info, h->root.root.string, input_bfd, input_section,
483 rel->r_vaddr - input_section->vma, TRUE)))
490 if (howto->type == R_OPTCALL && ! info->relocatable && symndx != -1)
495 class_val = h->symbol_class;
497 class_val = sym->n_sclass;
502 /* This symbol is apparently not from a COFF input file.
503 We warn, and then assume that it is not a leaf
505 if (! ((*info->callbacks->reloc_dangerous)
507 _("uncertain calling convention for non-COFF symbol"),
508 input_bfd, input_section,
509 rel->r_vaddr - input_section->vma)))
514 /* This is a call to a leaf procedure; use the bal
522 BFD_ASSERT (h->numaux == 2);
523 olf = h->aux[1].x_bal.x_balntry;
528 union internal_auxent aux;
530 BFD_ASSERT (sym->n_numaux == 2);
531 esyms = (bfd_byte *) obj_coff_external_syms (input_bfd);
532 esyms += (symndx + 2) * bfd_coff_symesz (input_bfd);
533 bfd_coff_swap_aux_in (input_bfd, (PTR) esyms, sym->n_type,
534 sym->n_sclass, 1, sym->n_numaux,
536 olf = aux.x_bal.x_balntry;
539 word = bfd_get_32 (input_bfd,
541 + (rel->r_vaddr - input_section->vma)));
542 word = ((word + olf - val) & BAL_MASK) | BAL;
543 bfd_put_32 (input_bfd,
545 contents + (rel->r_vaddr - input_section->vma));
557 if (howto->pc_relative)
558 addend += input_section->vma;
559 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
561 rel->r_vaddr - input_section->vma,
571 case bfd_reloc_overflow:
574 char buf[SYMNMLEN + 1];
582 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
587 if (! ((*info->callbacks->reloc_overflow)
588 (info, (h ? &h->root : NULL), name, howto->name,
589 (bfd_vma) 0, input_bfd, input_section,
590 rel->r_vaddr - input_section->vma)))
599 /* Adjust the symbol index of any reloc against a global symbol to
600 instead be a reloc against the internal symbol we created specially
604 coff_i960_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp)
605 bfd *obfd ATTRIBUTE_UNUSED;
606 struct bfd_link_info *info ATTRIBUTE_UNUSED;
608 asection *sec ATTRIBUTE_UNUSED;
609 struct internal_reloc *irel;
610 bfd_boolean *adjustedp;
612 struct coff_link_hash_entry *h;
616 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
618 || (h->root.type != bfd_link_hash_defined
619 && h->root.type != bfd_link_hash_defweak))
622 irel->r_symndx = h->root.u.def.section->output_section->target_index - 1;
628 #define coff_bfd_is_local_label_name coff_i960_is_local_label_name
630 #define coff_start_final_link coff_i960_start_final_link
632 #define coff_relocate_section coff_i960_relocate_section
634 #define coff_adjust_symndx coff_i960_adjust_symndx
636 #define coff_bfd_reloc_type_lookup coff_i960_reloc_type_lookup
637 #define coff_bfd_reloc_name_lookup coff_i960_reloc_name_lookup
639 #include "coffcode.h"
641 extern const bfd_target icoff_big_vec;
643 CREATE_LITTLE_COFF_TARGET_VEC (icoff_little_vec, "coff-Intel-little", 0, 0, '_', & icoff_big_vec, COFF_SWAP_TABLE)
645 const bfd_target icoff_big_vec =
647 "coff-Intel-big", /* name */
648 bfd_target_coff_flavour,
649 BFD_ENDIAN_LITTLE, /* data byte order is little */
650 BFD_ENDIAN_BIG, /* header byte order is big */
652 (HAS_RELOC | EXEC_P | /* object flags */
653 HAS_LINENO | HAS_DEBUG |
654 HAS_SYMS | HAS_LOCALS | WP_TEXT),
656 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
657 '_', /* leading underscore */
658 '/', /* ar_pad_char */
659 15, /* ar_max_namelen */
660 0, /* match priority. */
662 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
663 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
664 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
665 bfd_getb64, bfd_getb_signed_64, bfd_putb64,
666 bfd_getb32, bfd_getb_signed_32, bfd_putb32,
667 bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */
669 {_bfd_dummy_target, coff_object_p, /* bfd_check_format */
670 bfd_generic_archive_p, _bfd_dummy_target},
671 {bfd_false, coff_mkobject, /* bfd_set_format */
672 _bfd_generic_mkarchive, bfd_false},
673 {bfd_false, coff_write_object_contents, /* bfd_write_contents */
674 _bfd_write_archive_contents, bfd_false},
676 BFD_JUMP_TABLE_GENERIC (coff),
677 BFD_JUMP_TABLE_COPY (coff),
678 BFD_JUMP_TABLE_CORE (_bfd_nocore),
679 BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
680 BFD_JUMP_TABLE_SYMBOLS (coff),
681 BFD_JUMP_TABLE_RELOCS (coff),
682 BFD_JUMP_TABLE_WRITE (coff),
683 BFD_JUMP_TABLE_LINK (coff),
684 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),