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.
5 This file is part of BFD, the Binary File Descriptor library.
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.
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.
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. */
22 #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 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 *));
47 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (3)
49 /* The i960 does not support an MMU, so COFF_PAGE_SIZE can be
51 #define COFF_PAGE_SIZE 1
53 #define COFF_LONG_FILENAMES
55 #define CALLS 0x66003800 /* Template for 'calls' instruction */
56 #define BAL 0x0b000000 /* Template for 'bal' instruction */
57 #define BAL_MASK 0x00ffffff
59 static bfd_reloc_status_type
60 optcall_callback (abfd, reloc_entry, symbol_in, data,
61 input_section, ignore_bfd, error_message)
66 asection *input_section;
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);
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;
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))
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. */
93 (char *) "uncertain calling convention for non-COFF symbol";
94 result = bfd_reloc_dangerous;
98 switch (cs->native->u.syment.n_sclass)
102 /* This is a call to a leaf procedure, replace instruction with a bal
103 to the correct location. */
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);
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);
118 result = bfd_reloc_ok;
121 /* This is a call to a system call, replace with a calls to # */
123 result = bfd_reloc_ok;
126 result = bfd_reloc_ok;
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
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. */
148 static bfd_reloc_status_type
149 coff_i960_relocate (abfd, reloc_entry, symbol, data, input_section,
150 output_bfd, error_message)
152 arelent *reloc_entry;
155 asection *input_section;
157 char **error_message;
161 if (output_bfd == NULL)
163 /* Not generating relocateable output file. */
164 return bfd_reloc_continue;
167 if (bfd_is_und_section (bfd_get_section (symbol)))
169 /* Symbol is not defined, so no need to worry about it. */
170 return bfd_reloc_continue;
173 if (bfd_is_com_section (bfd_get_section (symbol)))
175 /* I don't really know what the right action is for a common
177 return bfd_reloc_continue;
180 /* Convert the reloc to use the section symbol. FIXME: This method
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;
189 const char *sec_name;
190 asymbol **syms, **sym_end;
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++)
197 if (bfd_asymbol_name (*syms) != NULL
198 && (*syms)->value == 0
199 && strcmp ((*syms)->section->output_section->name,
207 reloc_entry->sym_ptr_ptr = syms;
209 if (coff_section_data (output_bfd, osec) == NULL)
212 ((PTR) bfd_zalloc (abfd,
213 sizeof (struct coff_section_tdata)));
214 if (osec->used_by_bfd == NULL)
216 bfd_set_error (bfd_error_no_memory);
217 return bfd_reloc_overflow;
220 coff_section_data (output_bfd, osec)->tdata = (PTR) syms;
223 /* Let bfd_perform_relocation do its thing, which will include
224 stuffing the symbol addend into the object file. */
225 return bfd_reloc_continue;
228 static reloc_howto_type howto_rellong =
229 HOWTO ((unsigned int) R_RELLONG, 0, 2, 32,false, 0,
230 complain_overflow_bitfield, coff_i960_relocate,"rellong", true,
231 0xffffffff, 0xffffffff, 0);
232 static reloc_howto_type howto_iprmed =
233 HOWTO (R_IPRMED, 0, 2, 24,true,0, complain_overflow_signed,
234 coff_i960_relocate, "iprmed ", true, 0x00ffffff, 0x00ffffff, 0);
235 static reloc_howto_type howto_optcall =
236 HOWTO (R_OPTCALL, 0,2,24,true,0, complain_overflow_signed,
237 optcall_callback, "optcall", true, 0x00ffffff, 0x00ffffff, 0);
239 static reloc_howto_type *
240 coff_i960_reloc_type_lookup (abfd, code)
242 bfd_reloc_code_real_type code;
248 case BFD_RELOC_I960_CALLJ:
249 return &howto_optcall;
252 return &howto_rellong;
253 case BFD_RELOC_24_PCREL:
254 return &howto_iprmed;
258 /* The real code is in coffcode.h */
260 #define RTYPE2HOWTO(cache_ptr, dst) \
262 reloc_howto_type *howto_ptr; \
263 switch ((dst)->r_type) { \
264 case 17: howto_ptr = &howto_rellong; break; \
265 case 25: howto_ptr = &howto_iprmed; break; \
266 case 27: howto_ptr = &howto_optcall; break; \
267 default: howto_ptr = 0; break; \
269 (cache_ptr)->howto = howto_ptr; \
272 /* i960 COFF is used by VxWorks 5.1. However, VxWorks 5.1 does not
273 appear to correctly handle a reloc against a symbol defined in the
274 same object file. It appears to simply discard such relocs, rather
275 than adding their values into the object file. We handle this by
276 converting all relocs against global symbols into relocs against
277 internal symbols at the start of the section. This routine is
278 called at the start of the linking process, and it creates the
279 necessary symbols. */
282 coff_i960_start_final_link (abfd, info)
284 struct bfd_link_info *info;
286 bfd_size_type symesz = bfd_coff_symesz (abfd);
290 if (! info->relocateable)
293 esym = (bfd_byte *) malloc (symesz);
296 bfd_set_error (bfd_error_no_memory);
300 if (bfd_seek (abfd, obj_sym_filepos (abfd), SEEK_SET) != 0)
303 for (o = abfd->sections; o != NULL; o = o->next)
305 struct internal_syment isym;
307 strncpy (isym._n._n_name, o->name, SYMNMLEN);
309 isym.n_scnum = o->target_index;
310 isym.n_type = T_NULL;
311 isym.n_sclass = C_STAT;
314 bfd_coff_swap_sym_out (abfd, (PTR) &isym, (PTR) esym);
316 if (bfd_write (esym, symesz, 1, abfd) != symesz)
322 obj_raw_syment_count (abfd) += 1;
330 /* The reloc processing routine for the optimized COFF linker. */
333 coff_i960_relocate_section (output_bfd, info, input_bfd, input_section,
334 contents, relocs, syms, sections)
336 struct bfd_link_info *info;
338 asection *input_section;
340 struct internal_reloc *relocs;
341 struct internal_syment *syms;
344 struct internal_reloc *rel;
345 struct internal_reloc *relend;
348 relend = rel + input_section->reloc_count;
349 for (; rel < relend; rel++)
352 struct coff_link_hash_entry *h;
353 struct internal_syment *sym;
356 reloc_howto_type *howto;
357 bfd_reloc_status_type rstat = bfd_reloc_ok;
360 symndx = rel->r_symndx;
369 h = obj_coff_sym_hashes (input_bfd)[symndx];
373 if (sym != NULL && sym->n_scnum != 0)
374 addend = - sym->n_value;
380 case 17: howto = &howto_rellong; break;
381 case 25: howto = &howto_iprmed; break;
382 case 27: howto = &howto_optcall; break;
384 bfd_set_error (bfd_error_bad_value);
396 sec = bfd_abs_section_ptr;
401 sec = sections[symndx];
402 val = (sec->output_section->vma
410 if (h->root.type == bfd_link_hash_defined
411 || h->root.type == bfd_link_hash_defweak)
415 sec = h->root.u.def.section;
416 val = (h->root.u.def.value
417 + sec->output_section->vma
418 + sec->output_offset);
420 else if (! info->relocateable)
422 if (! ((*info->callbacks->undefined_symbol)
423 (info, h->root.root.string, input_bfd, input_section,
424 rel->r_vaddr - input_section->vma)))
431 if (howto->type == R_OPTCALL && ! info->relocateable && symndx != -1)
438 class = sym->n_sclass;
443 /* This symbol is apparently not from a COFF input file.
444 We warn, and then assume that it is not a leaf
446 if (! ((*info->callbacks->reloc_dangerous)
448 "uncertain calling convention for non-COFF symbol",
449 input_bfd, input_section,
450 rel->r_vaddr - input_section->vma)))
455 /* This is a call to a leaf procedure; use the bal
463 BFD_ASSERT (h->numaux == 2);
464 olf = h->aux[1].x_bal.x_balntry;
469 union internal_auxent aux;
471 BFD_ASSERT (sym->n_numaux == 2);
472 esyms = (bfd_byte *) obj_coff_external_syms (input_bfd);
473 esyms += (symndx + 2) * bfd_coff_symesz (input_bfd);
474 bfd_coff_swap_aux_in (input_bfd, (PTR) esyms, sym->n_type,
475 sym->n_sclass, 1, sym->n_numaux,
477 olf = aux.x_bal.x_balntry;
480 word = bfd_get_32 (input_bfd,
482 + (rel->r_vaddr - input_section->vma)));
483 word = ((word + olf - val) & BAL_MASK) | BAL;
484 bfd_put_32 (input_bfd,
487 + (rel->r_vaddr - input_section->vma)));
498 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
500 rel->r_vaddr - input_section->vma,
509 case bfd_reloc_overflow:
512 char buf[SYMNMLEN + 1];
517 name = h->root.root.string;
520 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
525 if (! ((*info->callbacks->reloc_overflow)
526 (info, name, howto->name, (bfd_vma) 0, input_bfd,
527 input_section, rel->r_vaddr - input_section->vma)))
536 /* Adjust the symbol index of any reloc against a global symbol to
537 instead be a reloc against the internal symbol we created specially
542 coff_i960_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp)
544 struct bfd_link_info *info;
547 struct internal_reloc *irel;
550 struct coff_link_hash_entry *h;
552 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
554 || (h->root.type != bfd_link_hash_defined
555 && h->root.type != bfd_link_hash_defweak))
558 irel->r_symndx = h->root.u.def.section->output_section->target_index - 1;
564 #define coff_start_final_link coff_i960_start_final_link
566 #define coff_relocate_section coff_i960_relocate_section
568 #define coff_adjust_symndx coff_i960_adjust_symndx
570 #define coff_bfd_reloc_type_lookup coff_i960_reloc_type_lookup
572 #include "coffcode.h"
574 const bfd_target icoff_little_vec =
576 "coff-Intel-little", /* name */
577 bfd_target_coff_flavour,
578 false, /* data byte order is little */
579 false, /* header byte order is little */
581 (HAS_RELOC | EXEC_P | /* object flags */
582 HAS_LINENO | HAS_DEBUG |
583 HAS_SYMS | HAS_LOCALS | WP_TEXT),
585 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
586 '_', /* leading underscore */
587 '/', /* ar_pad_char */
588 15, /* ar_max_namelen */
590 3, /* minimum alignment power */
591 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
592 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
593 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
594 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
595 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
596 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
598 {_bfd_dummy_target, coff_object_p, /* bfd_check_format */
599 bfd_generic_archive_p, _bfd_dummy_target},
600 {bfd_false, coff_mkobject, /* bfd_set_format */
601 _bfd_generic_mkarchive, bfd_false},
602 {bfd_false, coff_write_object_contents, /* bfd_write_contents */
603 _bfd_write_archive_contents, bfd_false},
605 BFD_JUMP_TABLE_GENERIC (coff),
606 BFD_JUMP_TABLE_COPY (coff),
607 BFD_JUMP_TABLE_CORE (_bfd_nocore),
608 BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
609 BFD_JUMP_TABLE_SYMBOLS (coff),
610 BFD_JUMP_TABLE_RELOCS (coff),
611 BFD_JUMP_TABLE_WRITE (coff),
612 BFD_JUMP_TABLE_LINK (coff),
613 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
619 const bfd_target icoff_big_vec =
621 "coff-Intel-big", /* name */
622 bfd_target_coff_flavour,
623 false, /* data byte order is little */
624 true, /* header byte order is big */
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 3, /* minimum alignment power */
636 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
637 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
638 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
639 bfd_getb64, bfd_getb_signed_64, bfd_putb64,
640 bfd_getb32, bfd_getb_signed_32, bfd_putb32,
641 bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */
643 {_bfd_dummy_target, coff_object_p, /* bfd_check_format */
644 bfd_generic_archive_p, _bfd_dummy_target},
645 {bfd_false, coff_mkobject, /* bfd_set_format */
646 _bfd_generic_mkarchive, bfd_false},
647 {bfd_false, coff_write_object_contents, /* bfd_write_contents */
648 _bfd_write_archive_contents, bfd_false},
650 BFD_JUMP_TABLE_GENERIC (coff),
651 BFD_JUMP_TABLE_COPY (coff),
652 BFD_JUMP_TABLE_CORE (_bfd_nocore),
653 BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
654 BFD_JUMP_TABLE_SYMBOLS (coff),
655 BFD_JUMP_TABLE_RELOCS (coff),
656 BFD_JUMP_TABLE_WRITE (coff),
657 BFD_JUMP_TABLE_LINK (coff),
658 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),