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.
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. */
40 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (3)
41 #define COFF_ALIGN_IN_SECTION_HEADER 1
43 #define GET_SCNHDR_ALIGN H_GET_32
44 #define PUT_SCNHDR_ALIGN H_PUT_32
46 /* The i960 does not support an MMU, so COFF_PAGE_SIZE can be
48 #define COFF_PAGE_SIZE 1
50 #define COFF_LONG_FILENAMES
52 /* This set of local label names is taken from gas. */
55 coff_i960_is_local_label_name (bfd *abfd ATTRIBUTE_UNUSED, const char *name)
57 return (name[0] == 'L'
64 /* This is just like the usual CALC_ADDEND, but it includes the
65 section VMA for PC relative relocs. */
67 #define CALC_ADDEND(abfd, ptr, reloc, cache_ptr) \
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)); \
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); \
82 cache_ptr->addend = 0; \
83 if (ptr && (reloc.r_type == 25 || reloc.r_type == 27)) \
84 cache_ptr->addend += asect->vma; \
88 #define CALLS 0x66003800 /* Template for 'calls' instruction */
89 #define BAL 0x0b000000 /* Template for 'bal' instruction */
90 #define BAL_MASK 0x00ffffff
92 static bfd_reloc_status_type
93 optcall_callback (bfd *abfd,
97 asection *input_section,
98 bfd *ignore_bfd ATTRIBUTE_UNUSED,
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);
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;
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))
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. */
124 (char *) _("uncertain calling convention for non-COFF symbol");
125 result = bfd_reloc_dangerous;
129 switch (cs->native->u.syment.n_sclass)
133 /* This is a call to a leaf procedure, replace instruction with a bal
134 to the correct location. */
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);
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);
150 result = bfd_reloc_ok;
153 /* This is a call to a system call, replace with a calls to # */
155 result = bfd_reloc_ok;
158 result = bfd_reloc_ok;
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
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. */
180 static bfd_reloc_status_type
181 coff_i960_relocate (bfd *abfd,
182 arelent *reloc_entry,
184 void * data ATTRIBUTE_UNUSED,
185 asection *input_section ATTRIBUTE_UNUSED,
187 char **error_message ATTRIBUTE_UNUSED)
191 if (output_bfd == NULL)
193 /* Not generating relocatable output file. */
194 return bfd_reloc_continue;
197 if (bfd_is_und_section (bfd_get_section (symbol)))
199 /* Symbol is not defined, so no need to worry about it. */
200 return bfd_reloc_continue;
203 if (bfd_is_com_section (bfd_get_section (symbol)))
205 /* I don't really know what the right action is for a common
207 return bfd_reloc_continue;
210 /* Convert the reloc to use the section symbol. FIXME: This method
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;
219 const char *sec_name;
220 asymbol **syms, **sym_end;
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++)
227 if (bfd_asymbol_name (*syms) != NULL
228 && (*syms)->value == 0
229 && strcmp ((*syms)->section->output_section->name,
237 reloc_entry->sym_ptr_ptr = syms;
239 if (coff_section_data (output_bfd, osec) == NULL)
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;
246 coff_section_data (output_bfd, osec)->tdata = syms;
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;
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);
265 static reloc_howto_type *
266 coff_i960_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
267 bfd_reloc_code_real_type code)
273 case BFD_RELOC_I960_CALLJ:
274 return &howto_optcall;
277 return &howto_rellong;
278 case BFD_RELOC_24_PCREL:
279 return &howto_iprmed;
283 static reloc_howto_type *
284 coff_i960_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
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;
297 /* The real code is in coffcode.h */
299 #define RTYPE2HOWTO(cache_ptr, dst) \
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; \
308 (cache_ptr)->howto = howto_ptr; \
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. */
321 coff_i960_start_final_link (bfd *abfd, struct bfd_link_info *info)
323 bfd_size_type symesz = bfd_coff_symesz (abfd);
327 if (! info->relocatable)
330 esym = (bfd_byte *) bfd_malloc (symesz);
334 if (bfd_seek (abfd, obj_sym_filepos (abfd), SEEK_SET) != 0)
337 for (o = abfd->sections; o != NULL; o = o->next)
339 struct internal_syment isym;
341 strncpy (isym._n._n_name, o->name, SYMNMLEN);
343 isym.n_scnum = o->target_index;
344 isym.n_type = T_NULL;
345 isym.n_sclass = C_STAT;
348 bfd_coff_swap_sym_out (abfd, &isym, esym);
350 if (bfd_bwrite (esym, symesz, abfd) != symesz)
356 obj_raw_syment_count (abfd) += 1;
364 /* The reloc processing routine for the optimized COFF linker. */
367 coff_i960_relocate_section (bfd *output_bfd ATTRIBUTE_UNUSED,
368 struct bfd_link_info *info,
370 asection *input_section,
372 struct internal_reloc *relocs,
373 struct internal_syment *syms,
376 struct internal_reloc *rel;
377 struct internal_reloc *relend;
380 relend = rel + input_section->reloc_count;
381 for (; rel < relend; rel++)
384 struct coff_link_hash_entry *h;
385 struct internal_syment *sym;
388 reloc_howto_type *howto;
389 bfd_reloc_status_type rstat = bfd_reloc_ok;
392 symndx = rel->r_symndx;
401 h = obj_coff_sym_hashes (input_bfd)[symndx];
405 if (sym != NULL && sym->n_scnum != 0)
406 addend = - sym->n_value;
412 case 17: howto = &howto_rellong; break;
413 case 25: howto = &howto_iprmed; break;
414 case 27: howto = &howto_optcall; break;
416 bfd_set_error (bfd_error_bad_value);
428 sec = bfd_abs_section_ptr;
433 sec = sections[symndx];
434 val = (sec->output_section->vma
442 if (h->root.type == bfd_link_hash_defined
443 || h->root.type == bfd_link_hash_defweak)
447 sec = h->root.u.def.section;
448 val = (h->root.u.def.value
449 + sec->output_section->vma
450 + sec->output_offset);
452 else if (! info->relocatable)
454 if (! ((*info->callbacks->undefined_symbol)
455 (info, h->root.root.string, input_bfd, input_section,
456 rel->r_vaddr - input_section->vma, TRUE)))
463 if (howto->type == R_OPTCALL && ! info->relocatable && symndx != -1)
468 class_val = h->symbol_class;
470 class_val = sym->n_sclass;
475 /* This symbol is apparently not from a COFF input file.
476 We warn, and then assume that it is not a leaf
478 if (! ((*info->callbacks->reloc_dangerous)
480 _("uncertain calling convention for non-COFF symbol"),
481 input_bfd, input_section,
482 rel->r_vaddr - input_section->vma)))
487 /* This is a call to a leaf procedure; use the bal
495 BFD_ASSERT (h->numaux == 2);
496 olf = h->aux[1].x_bal.x_balntry;
501 union internal_auxent aux;
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,
509 olf = aux.x_bal.x_balntry;
512 word = bfd_get_32 (input_bfd,
514 + (rel->r_vaddr - input_section->vma)));
515 word = ((word + olf - val) & BAL_MASK) | BAL;
516 bfd_put_32 (input_bfd,
518 contents + (rel->r_vaddr - input_section->vma));
530 if (howto->pc_relative)
531 addend += input_section->vma;
532 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
534 rel->r_vaddr - input_section->vma,
544 case bfd_reloc_overflow:
547 char buf[SYMNMLEN + 1];
555 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
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)))
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
577 coff_i960_adjust_symndx (bfd *obfd ATTRIBUTE_UNUSED,
578 struct bfd_link_info *info ATTRIBUTE_UNUSED,
580 asection *sec ATTRIBUTE_UNUSED,
581 struct internal_reloc *irel,
582 bfd_boolean *adjustedp)
584 struct coff_link_hash_entry *h;
588 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
590 || (h->root.type != bfd_link_hash_defined
591 && h->root.type != bfd_link_hash_defweak))
594 irel->r_symndx = h->root.u.def.section->output_section->target_index - 1;
600 #define coff_bfd_is_local_label_name coff_i960_is_local_label_name
602 #define coff_start_final_link coff_i960_start_final_link
604 #define coff_relocate_section coff_i960_relocate_section
606 #define coff_adjust_symndx coff_i960_adjust_symndx
608 #define coff_bfd_reloc_type_lookup coff_i960_reloc_type_lookup
609 #define coff_bfd_reloc_name_lookup coff_i960_reloc_name_lookup
611 #include "coffcode.h"
613 extern const bfd_target icoff_big_vec;
615 CREATE_LITTLE_COFF_TARGET_VEC (icoff_little_vec, "coff-Intel-little", 0, 0, '_', & icoff_big_vec, COFF_SWAP_TABLE)
617 const bfd_target icoff_big_vec =
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 */
624 (HAS_RELOC | EXEC_P | /* object flags */
625 HAS_LINENO | HAS_DEBUG |
626 HAS_SYMS | HAS_LOCALS | WP_TEXT),
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. */
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 */
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},
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),