1 /* BFD back-end for Intel 960 COFF files.
2 Copyright (C) 1990, 91, 92, 93, 94, 95, 97, 98, 1999
3 Free Software Foundation, Inc.
4 Written by Cygnus Support.
6 This file is part of BFD, the Binary File Descriptor library.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
23 #define BADMAG(x) I960BADMAG(x)
28 #include "coff/i960.h"
29 #include "coff/internal.h"
30 #include "libcoff.h" /* to allow easier abstraction-breaking */
32 static boolean coff_i960_is_local_label_name PARAMS ((bfd *, const char *));
33 static bfd_reloc_status_type optcall_callback
34 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
35 static bfd_reloc_status_type coff_i960_relocate
36 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
37 static reloc_howto_type *coff_i960_reloc_type_lookup
38 PARAMS ((bfd *, bfd_reloc_code_real_type));
39 static boolean coff_i960_start_final_link
40 PARAMS ((bfd *, struct bfd_link_info *));
41 static boolean coff_i960_relocate_section
42 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
43 struct internal_reloc *, struct internal_syment *, asection **));
44 static boolean coff_i960_adjust_symndx
45 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *,
46 struct internal_reloc *, boolean *));
48 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (3)
49 #define COFF_ALIGN_IN_SECTION_HEADER 1
51 #define GET_SCNHDR_ALIGN bfd_h_get_32
52 #define PUT_SCNHDR_ALIGN bfd_h_put_32
54 /* The i960 does not support an MMU, so COFF_PAGE_SIZE can be
56 #define COFF_PAGE_SIZE 1
58 #define COFF_LONG_FILENAMES
60 /* This set of local label names is taken from gas. */
63 coff_i960_is_local_label_name (abfd, name)
64 bfd *abfd ATTRIBUTE_UNUSED;
67 return (name[0] == 'L'
74 /* This is just like the usual CALC_ADDEND, but it includes the
75 section VMA for PC relative relocs. */
77 #define CALC_ADDEND(abfd, ptr, reloc, cache_ptr) \
79 coff_symbol_type *coffsym = (coff_symbol_type *) NULL; \
80 if (ptr && bfd_asymbol_bfd (ptr) != abfd) \
81 coffsym = (obj_symbols (abfd) \
82 + (cache_ptr->sym_ptr_ptr - symbols)); \
84 coffsym = coff_symbol_from (abfd, ptr); \
85 if (coffsym != (coff_symbol_type *) NULL \
86 && coffsym->native->u.syment.n_scnum == 0) \
87 cache_ptr->addend = 0; \
88 else if (ptr && bfd_asymbol_bfd (ptr) == abfd \
89 && ptr->section != (asection *) NULL) \
90 cache_ptr->addend = - (ptr->section->vma + ptr->value); \
92 cache_ptr->addend = 0; \
93 if (ptr && (reloc.r_type == 25 || reloc.r_type == 27)) \
94 cache_ptr->addend += asect->vma; \
98 #define CALLS 0x66003800 /* Template for 'calls' instruction */
99 #define BAL 0x0b000000 /* Template for 'bal' instruction */
100 #define BAL_MASK 0x00ffffff
102 static bfd_reloc_status_type
103 optcall_callback (abfd, reloc_entry, symbol_in, data,
104 input_section, ignore_bfd, error_message)
106 arelent *reloc_entry;
109 asection *input_section;
110 bfd *ignore_bfd ATTRIBUTE_UNUSED;
111 char **error_message;
113 /* This item has already been relocated correctly, but we may be
114 * able to patch in yet better code - done by digging out the
115 * correct info on this symbol */
116 bfd_reloc_status_type result;
117 coff_symbol_type *cs = coffsymbol(symbol_in);
119 /* Don't do anything with symbols which aren't tied up yet,
120 except move the reloc. */
121 if (bfd_is_und_section (cs->symbol.section)) {
122 reloc_entry->address += input_section->output_offset;
126 /* So the target symbol has to be of coff type, and the symbol
127 has to have the correct native information within it */
128 if ((bfd_asymbol_flavour(&cs->symbol) != bfd_target_coff_flavour)
129 || (cs->native == (combined_entry_type *)NULL))
131 /* This is interesting, consider the case where we're outputting coff
132 from a mix n match input, linking from coff to a symbol defined in a
133 bout file will cause this match to be true. Should I complain? This
134 will only work if the bout symbol is non leaf. */
136 (char *) _("uncertain calling convention for non-COFF symbol");
137 result = bfd_reloc_dangerous;
141 switch (cs->native->u.syment.n_sclass)
145 /* This is a call to a leaf procedure, replace instruction with a bal
146 to the correct location. */
148 union internal_auxent *aux = &((cs->native+2)->u.auxent);
149 int word = bfd_get_32(abfd, (bfd_byte *)data + reloc_entry->address);
150 int olf = (aux->x_bal.x_balntry - cs->native->u.syment.n_value);
151 BFD_ASSERT(cs->native->u.syment.n_numaux==2);
153 /* We replace the original call instruction with a bal to
154 the bal entry point - the offset of which is described in
155 the 2nd auxent of the original symbol. We keep the native
156 sym and auxents untouched, so the delta between the two
157 is the offset of the bal entry point. */
158 word = ((word + olf) & BAL_MASK) | BAL;
159 bfd_put_32(abfd, word, (bfd_byte *) data + reloc_entry->address);
161 result = bfd_reloc_ok;
164 /* This is a call to a system call, replace with a calls to # */
166 result = bfd_reloc_ok;
169 result = bfd_reloc_ok;
176 /* i960 COFF is used by VxWorks 5.1. However, VxWorks 5.1 does not
177 appear to correctly handle a reloc against a symbol defined in the
178 same object file. It appears to simply discard such relocs, rather
179 than adding their values into the object file. We handle this here
180 by converting all relocs against defined symbols into relocs
181 against the section symbol, when generating a relocateable output
184 Note that this function is only called if we are not using the COFF
185 specific backend linker. It only does something when doing a
186 relocateable link, which will almost certainly fail when not
187 generating COFF i960 output, so this function is actually no longer
188 useful. It was used before this target was converted to use the
189 COFF specific backend linker. */
191 static bfd_reloc_status_type
192 coff_i960_relocate (abfd, reloc_entry, symbol, data, input_section,
193 output_bfd, error_message)
195 arelent *reloc_entry;
197 PTR data ATTRIBUTE_UNUSED;
198 asection *input_section ATTRIBUTE_UNUSED;
200 char **error_message ATTRIBUTE_UNUSED;
204 if (output_bfd == NULL)
206 /* Not generating relocateable output file. */
207 return bfd_reloc_continue;
210 if (bfd_is_und_section (bfd_get_section (symbol)))
212 /* Symbol is not defined, so no need to worry about it. */
213 return bfd_reloc_continue;
216 if (bfd_is_com_section (bfd_get_section (symbol)))
218 /* I don't really know what the right action is for a common
220 return bfd_reloc_continue;
223 /* Convert the reloc to use the section symbol. FIXME: This method
225 osec = bfd_get_section (symbol)->output_section;
226 if (coff_section_data (output_bfd, osec) != NULL
227 && coff_section_data (output_bfd, osec)->tdata != NULL)
228 reloc_entry->sym_ptr_ptr =
229 (asymbol **) coff_section_data (output_bfd, osec)->tdata;
232 const char *sec_name;
233 asymbol **syms, **sym_end;
235 sec_name = bfd_get_section_name (output_bfd, osec);
236 syms = bfd_get_outsymbols (output_bfd);
237 sym_end = syms + bfd_get_symcount (output_bfd);
238 for (; syms < sym_end; syms++)
240 if (bfd_asymbol_name (*syms) != NULL
241 && (*syms)->value == 0
242 && strcmp ((*syms)->section->output_section->name,
250 reloc_entry->sym_ptr_ptr = syms;
252 if (coff_section_data (output_bfd, osec) == NULL)
255 ((PTR) bfd_zalloc (abfd,
256 sizeof (struct coff_section_tdata)));
257 if (osec->used_by_bfd == NULL)
258 return bfd_reloc_overflow;
260 coff_section_data (output_bfd, osec)->tdata = (PTR) syms;
263 /* Let bfd_perform_relocation do its thing, which will include
264 stuffing the symbol addend into the object file. */
265 return bfd_reloc_continue;
268 static reloc_howto_type howto_rellong =
269 HOWTO ((unsigned int) R_RELLONG, 0, 2, 32,false, 0,
270 complain_overflow_bitfield, coff_i960_relocate,"rellong", true,
271 0xffffffff, 0xffffffff, 0);
272 static reloc_howto_type howto_iprmed =
273 HOWTO (R_IPRMED, 0, 2, 24,true,0, complain_overflow_signed,
274 coff_i960_relocate, "iprmed ", true, 0x00ffffff, 0x00ffffff, 0);
275 static reloc_howto_type howto_optcall =
276 HOWTO (R_OPTCALL, 0,2,24,true,0, complain_overflow_signed,
277 optcall_callback, "optcall", true, 0x00ffffff, 0x00ffffff, 0);
279 static reloc_howto_type *
280 coff_i960_reloc_type_lookup (abfd, code)
281 bfd *abfd ATTRIBUTE_UNUSED;
282 bfd_reloc_code_real_type code;
288 case BFD_RELOC_I960_CALLJ:
289 return &howto_optcall;
292 return &howto_rellong;
293 case BFD_RELOC_24_PCREL:
294 return &howto_iprmed;
298 /* The real code is in coffcode.h */
300 #define RTYPE2HOWTO(cache_ptr, dst) \
302 reloc_howto_type *howto_ptr; \
303 switch ((dst)->r_type) { \
304 case 17: howto_ptr = &howto_rellong; break; \
305 case 25: howto_ptr = &howto_iprmed; break; \
306 case 27: howto_ptr = &howto_optcall; break; \
307 default: howto_ptr = 0; break; \
309 (cache_ptr)->howto = howto_ptr; \
312 /* i960 COFF is used by VxWorks 5.1. However, VxWorks 5.1 does not
313 appear to correctly handle a reloc against a symbol defined in the
314 same object file. It appears to simply discard such relocs, rather
315 than adding their values into the object file. We handle this by
316 converting all relocs against global symbols into relocs against
317 internal symbols at the start of the section. This routine is
318 called at the start of the linking process, and it creates the
319 necessary symbols. */
322 coff_i960_start_final_link (abfd, info)
324 struct bfd_link_info *info;
326 bfd_size_type symesz = bfd_coff_symesz (abfd);
330 if (! info->relocateable)
333 esym = (bfd_byte *) bfd_malloc (symesz);
337 if (bfd_seek (abfd, obj_sym_filepos (abfd), SEEK_SET) != 0)
340 for (o = abfd->sections; o != NULL; o = o->next)
342 struct internal_syment isym;
344 strncpy (isym._n._n_name, o->name, SYMNMLEN);
346 isym.n_scnum = o->target_index;
347 isym.n_type = T_NULL;
348 isym.n_sclass = C_STAT;
351 bfd_coff_swap_sym_out (abfd, (PTR) &isym, (PTR) esym);
353 if (bfd_write (esym, symesz, 1, abfd) != symesz)
359 obj_raw_syment_count (abfd) += 1;
367 /* The reloc processing routine for the optimized COFF linker. */
370 coff_i960_relocate_section (output_bfd, info, input_bfd, input_section,
371 contents, relocs, syms, sections)
372 bfd *output_bfd ATTRIBUTE_UNUSED;
373 struct bfd_link_info *info;
375 asection *input_section;
377 struct internal_reloc *relocs;
378 struct internal_syment *syms;
381 struct internal_reloc *rel;
382 struct internal_reloc *relend;
385 relend = rel + input_section->reloc_count;
386 for (; rel < relend; rel++)
389 struct coff_link_hash_entry *h;
390 struct internal_syment *sym;
393 reloc_howto_type *howto;
394 bfd_reloc_status_type rstat = bfd_reloc_ok;
397 symndx = rel->r_symndx;
406 h = obj_coff_sym_hashes (input_bfd)[symndx];
410 if (sym != NULL && sym->n_scnum != 0)
411 addend = - sym->n_value;
417 case 17: howto = &howto_rellong; break;
418 case 25: howto = &howto_iprmed; break;
419 case 27: howto = &howto_optcall; break;
421 bfd_set_error (bfd_error_bad_value);
433 sec = bfd_abs_section_ptr;
438 sec = sections[symndx];
439 val = (sec->output_section->vma
447 if (h->root.type == bfd_link_hash_defined
448 || h->root.type == bfd_link_hash_defweak)
452 sec = h->root.u.def.section;
453 val = (h->root.u.def.value
454 + sec->output_section->vma
455 + sec->output_offset);
457 else if (! info->relocateable)
459 if (! ((*info->callbacks->undefined_symbol)
460 (info, h->root.root.string, input_bfd, input_section,
461 rel->r_vaddr - input_section->vma)))
468 if (howto->type == R_OPTCALL && ! info->relocateable && symndx != -1)
475 class = sym->n_sclass;
480 /* This symbol is apparently not from a COFF input file.
481 We warn, and then assume that it is not a leaf
483 if (! ((*info->callbacks->reloc_dangerous)
485 _("uncertain calling convention for non-COFF symbol"),
486 input_bfd, input_section,
487 rel->r_vaddr - input_section->vma)))
492 /* This is a call to a leaf procedure; use the bal
500 BFD_ASSERT (h->numaux == 2);
501 olf = h->aux[1].x_bal.x_balntry;
506 union internal_auxent aux;
508 BFD_ASSERT (sym->n_numaux == 2);
509 esyms = (bfd_byte *) obj_coff_external_syms (input_bfd);
510 esyms += (symndx + 2) * bfd_coff_symesz (input_bfd);
511 bfd_coff_swap_aux_in (input_bfd, (PTR) esyms, sym->n_type,
512 sym->n_sclass, 1, sym->n_numaux,
514 olf = aux.x_bal.x_balntry;
517 word = bfd_get_32 (input_bfd,
519 + (rel->r_vaddr - input_section->vma)));
520 word = ((word + olf - val) & BAL_MASK) | BAL;
521 bfd_put_32 (input_bfd,
524 + (rel->r_vaddr - input_section->vma)));
536 if (howto->pc_relative)
537 addend += input_section->vma;
538 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
540 rel->r_vaddr - input_section->vma,
550 case bfd_reloc_overflow:
553 char buf[SYMNMLEN + 1];
558 name = h->root.root.string;
561 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
566 if (! ((*info->callbacks->reloc_overflow)
567 (info, name, howto->name, (bfd_vma) 0, input_bfd,
568 input_section, rel->r_vaddr - input_section->vma)))
577 /* Adjust the symbol index of any reloc against a global symbol to
578 instead be a reloc against the internal symbol we created specially
583 coff_i960_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp)
584 bfd *obfd ATTRIBUTE_UNUSED;
585 struct bfd_link_info *info ATTRIBUTE_UNUSED;
587 asection *sec ATTRIBUTE_UNUSED;
588 struct internal_reloc *irel;
591 struct coff_link_hash_entry *h;
595 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
597 || (h->root.type != bfd_link_hash_defined
598 && h->root.type != bfd_link_hash_defweak))
601 irel->r_symndx = h->root.u.def.section->output_section->target_index - 1;
607 #define coff_bfd_is_local_label_name coff_i960_is_local_label_name
609 #define coff_start_final_link coff_i960_start_final_link
611 #define coff_relocate_section coff_i960_relocate_section
613 #define coff_adjust_symndx coff_i960_adjust_symndx
615 #define coff_bfd_reloc_type_lookup coff_i960_reloc_type_lookup
617 #include "coffcode.h"
619 const bfd_target icoff_little_vec =
621 "coff-Intel-little", /* name */
622 bfd_target_coff_flavour,
623 BFD_ENDIAN_LITTLE, /* data byte order is little */
624 BFD_ENDIAN_LITTLE, /* header byte order is little */
626 (HAS_RELOC | EXEC_P | /* object flags */
627 HAS_LINENO | HAS_DEBUG |
628 HAS_SYMS | HAS_LOCALS | WP_TEXT),
630 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
631 '_', /* leading underscore */
632 '/', /* ar_pad_char */
633 15, /* ar_max_namelen */
635 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
636 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
637 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
638 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
639 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
640 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
642 {_bfd_dummy_target, coff_object_p, /* bfd_check_format */
643 bfd_generic_archive_p, _bfd_dummy_target},
644 {bfd_false, coff_mkobject, /* bfd_set_format */
645 _bfd_generic_mkarchive, bfd_false},
646 {bfd_false, coff_write_object_contents, /* bfd_write_contents */
647 _bfd_write_archive_contents, bfd_false},
649 BFD_JUMP_TABLE_GENERIC (coff),
650 BFD_JUMP_TABLE_COPY (coff),
651 BFD_JUMP_TABLE_CORE (_bfd_nocore),
652 BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
653 BFD_JUMP_TABLE_SYMBOLS (coff),
654 BFD_JUMP_TABLE_RELOCS (coff),
655 BFD_JUMP_TABLE_WRITE (coff),
656 BFD_JUMP_TABLE_LINK (coff),
657 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
663 const bfd_target icoff_big_vec =
665 "coff-Intel-big", /* name */
666 bfd_target_coff_flavour,
667 BFD_ENDIAN_LITTLE, /* data byte order is little */
668 BFD_ENDIAN_BIG, /* header byte order is big */
670 (HAS_RELOC | EXEC_P | /* object flags */
671 HAS_LINENO | HAS_DEBUG |
672 HAS_SYMS | HAS_LOCALS | WP_TEXT),
674 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
675 '_', /* leading underscore */
676 '/', /* ar_pad_char */
677 15, /* ar_max_namelen */
679 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
680 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
681 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
682 bfd_getb64, bfd_getb_signed_64, bfd_putb64,
683 bfd_getb32, bfd_getb_signed_32, bfd_putb32,
684 bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */
686 {_bfd_dummy_target, coff_object_p, /* bfd_check_format */
687 bfd_generic_archive_p, _bfd_dummy_target},
688 {bfd_false, coff_mkobject, /* bfd_set_format */
689 _bfd_generic_mkarchive, bfd_false},
690 {bfd_false, coff_write_object_contents, /* bfd_write_contents */
691 _bfd_write_archive_contents, bfd_false},
693 BFD_JUMP_TABLE_GENERIC (coff),
694 BFD_JUMP_TABLE_COPY (coff),
695 BFD_JUMP_TABLE_CORE (_bfd_nocore),
696 BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
697 BFD_JUMP_TABLE_SYMBOLS (coff),
698 BFD_JUMP_TABLE_RELOCS (coff),
699 BFD_JUMP_TABLE_WRITE (coff),
700 BFD_JUMP_TABLE_LINK (coff),
701 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),