1 /* BFD back-end for Intel 860 COFF files.
2 Copyright 1990, 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
3 Created mostly by substituting "860" for "386" in coff-i386.c
4 Harry Dolan <dolan@ssd.intel.com>, October 1995
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. */
27 #include "coff/i860.h"
29 #include "coff/internal.h"
33 static bfd_reloc_status_type coff_i860_reloc
34 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
35 static reloc_howto_type *coff_i860_rtype_to_howto
36 PARAMS ((bfd *, asection *, struct internal_reloc *,
37 struct coff_link_hash_entry *, struct internal_syment *,
40 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
41 /* The page size is a guess based on ELF. */
43 #define COFF_PAGE_SIZE 0x1000
45 /* For some reason when using i860 COFF the value stored in the .text
46 section for a reference to a common symbol is the value itself plus
47 any desired offset. Ian Taylor, Cygnus Support. */
49 /* If we are producing relocateable output, we need to do some
50 adjustments to the object file that are not done by the
51 bfd_perform_relocation function. This function is called by every
52 reloc type to make any required adjustments. */
54 static bfd_reloc_status_type
55 coff_i860_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd,
61 asection *input_section;
67 if (output_bfd == (bfd *) NULL)
68 return bfd_reloc_continue;
71 if (bfd_is_com_section (symbol->section))
73 /* We are relocating a common symbol. The current value in the
74 object file is ORIG + OFFSET, where ORIG is the value of the
75 common symbol as seen by the object file when it was compiled
76 (this may be zero if the symbol was undefined) and OFFSET is
77 the offset into the common symbol (normally zero, but may be
78 non-zero when referring to a field in a common structure).
79 ORIG is the negative of reloc_entry->addend, which is set by
80 the CALC_ADDEND macro below. We want to replace the value in
81 the object file with NEW + OFFSET, where NEW is the value of
82 the common symbol which we are going to put in the final
83 object file. NEW is symbol->value. */
84 diff = symbol->value + reloc_entry->addend;
88 /* For some reason bfd_perform_relocation always effectively
89 ignores the addend for a COFF target when producing
90 relocateable output. This seems to be always wrong for 860
91 COFF, so we handle the addend here instead. */
92 diff = reloc_entry->addend;
97 x = ((x & ~howto->dst_mask) | (((x & howto->src_mask) + diff) & howto->dst_mask))
101 reloc_howto_type *howto = reloc_entry->howto;
102 unsigned char *addr = (unsigned char *) data + reloc_entry->address;
108 char x = bfd_get_8 (abfd, addr);
110 bfd_put_8 (abfd, x, addr);
116 short x = bfd_get_16 (abfd, addr);
118 bfd_put_16 (abfd, x, addr);
124 long x = bfd_get_32 (abfd, addr);
126 bfd_put_32 (abfd, x, addr);
135 /* Now let bfd_perform_relocation finish everything up. */
136 return bfd_reloc_continue;
140 #define PCRELOFFSET false
143 static reloc_howto_type howto_table[] =
151 HOWTO (R_DIR32, /* type */
153 2, /* size (0 = byte, 1 = short, 2 = long) */
155 false, /* pc_relative */
157 complain_overflow_bitfield, /* complain_on_overflow */
158 coff_i860_reloc, /* special_function */
160 true, /* partial_inplace */
161 0xffffffff, /* src_mask */
162 0xffffffff, /* dst_mask */
163 true), /* pcrel_offset */
165 HOWTO (R_IMAGEBASE, /* type */
167 2, /* size (0 = byte, 1 = short, 2 = long) */
169 false, /* pc_relative */
171 complain_overflow_bitfield, /* complain_on_overflow */
172 coff_i860_reloc, /* special_function */
174 true, /* partial_inplace */
175 0xffffffff, /* src_mask */
176 0xffffffff, /* dst_mask */
177 false), /* pcrel_offset */
185 HOWTO (R_RELBYTE, /* type */
187 0, /* size (0 = byte, 1 = short, 2 = long) */
189 false, /* pc_relative */
191 complain_overflow_bitfield, /* complain_on_overflow */
192 coff_i860_reloc, /* special_function */
194 true, /* partial_inplace */
195 0x000000ff, /* src_mask */
196 0x000000ff, /* dst_mask */
197 PCRELOFFSET), /* pcrel_offset */
198 HOWTO (R_RELWORD, /* type */
200 1, /* size (0 = byte, 1 = short, 2 = long) */
202 false, /* pc_relative */
204 complain_overflow_bitfield, /* complain_on_overflow */
205 coff_i860_reloc, /* special_function */
207 true, /* partial_inplace */
208 0x0000ffff, /* src_mask */
209 0x0000ffff, /* dst_mask */
210 PCRELOFFSET), /* pcrel_offset */
211 HOWTO (R_RELLONG, /* type */
213 2, /* size (0 = byte, 1 = short, 2 = long) */
215 false, /* pc_relative */
217 complain_overflow_bitfield, /* complain_on_overflow */
218 coff_i860_reloc, /* special_function */
220 true, /* partial_inplace */
221 0xffffffff, /* src_mask */
222 0xffffffff, /* dst_mask */
223 PCRELOFFSET), /* pcrel_offset */
224 HOWTO (R_PCRBYTE, /* type */
226 0, /* size (0 = byte, 1 = short, 2 = long) */
228 true, /* pc_relative */
230 complain_overflow_signed, /* complain_on_overflow */
231 coff_i860_reloc, /* special_function */
233 true, /* partial_inplace */
234 0x000000ff, /* src_mask */
235 0x000000ff, /* dst_mask */
236 PCRELOFFSET), /* pcrel_offset */
237 HOWTO (R_PCRWORD, /* type */
239 1, /* size (0 = byte, 1 = short, 2 = long) */
241 true, /* pc_relative */
243 complain_overflow_signed, /* complain_on_overflow */
244 coff_i860_reloc, /* special_function */
246 true, /* partial_inplace */
247 0x0000ffff, /* src_mask */
248 0x0000ffff, /* dst_mask */
249 PCRELOFFSET), /* pcrel_offset */
250 HOWTO (R_PCRLONG, /* type */
252 2, /* size (0 = byte, 1 = short, 2 = long) */
254 true, /* pc_relative */
256 complain_overflow_signed, /* complain_on_overflow */
257 coff_i860_reloc, /* special_function */
259 true, /* partial_inplace */
260 0xffffffff, /* src_mask */
261 0xffffffff, /* dst_mask */
262 PCRELOFFSET) /* pcrel_offset */
265 /* Turn a howto into a reloc nunmber */
267 #define SELECT_RELOC(x,howto) { x.r_type = howto->type; }
268 #define BADMAG(x) I860BADMAG(x)
269 #define I860 1 /* Customize coffcode.h */
271 #define RTYPE2HOWTO(cache_ptr, dst) \
272 (cache_ptr)->howto = howto_table + (dst)->r_type;
274 /* For 860 COFF a STYP_NOLOAD | STYP_BSS section is part of a shared
275 library. On some other COFF targets STYP_BSS is normally
277 #define BSS_NOLOAD_IS_SHARED_LIBRARY
279 /* Compute the addend of a reloc. If the reloc is to a common symbol,
280 the object file contains the value of the common symbol. By the
281 time this is called, the linker may be using a different symbol
282 from a different object file with a different value. Therefore, we
283 hack wildly to locate the original symbol from this file so that we
284 can make the correct adjustment. This macro sets coffsym to the
285 symbol from the original file, and uses it to set the addend value
286 correctly. If this is not a common symbol, the usual addend
287 calculation is done, except that an additional tweak is needed for
289 FIXME: This macro refers to symbols and asect; these are from the
290 calling function, not the macro arguments. */
292 #define CALC_ADDEND(abfd, ptr, reloc, cache_ptr) \
294 coff_symbol_type *coffsym = (coff_symbol_type *) NULL; \
295 if (ptr && bfd_asymbol_bfd (ptr) != abfd) \
296 coffsym = (obj_symbols (abfd) \
297 + (cache_ptr->sym_ptr_ptr - symbols)); \
299 coffsym = coff_symbol_from (abfd, ptr); \
300 if (coffsym != (coff_symbol_type *) NULL \
301 && coffsym->native->u.syment.n_scnum == 0) \
302 cache_ptr->addend = - coffsym->native->u.syment.n_value; \
303 else if (ptr && bfd_asymbol_bfd (ptr) == abfd \
304 && ptr->section != (asection *) NULL) \
305 cache_ptr->addend = - (ptr->section->vma + ptr->value); \
307 cache_ptr->addend = 0; \
308 if (ptr && howto_table[reloc.r_type].pc_relative) \
309 cache_ptr->addend += asect->vma; \
312 /* We use the special COFF backend linker. */
313 #define coff_relocate_section _bfd_coff_generic_relocate_section
315 static reloc_howto_type *
316 coff_i860_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
319 struct internal_reloc *rel;
320 struct coff_link_hash_entry *h;
321 struct internal_syment *sym;
325 reloc_howto_type *howto;
327 howto = howto_table + rel->r_type;
329 if (howto->pc_relative)
330 *addendp += sec->vma;
332 if (sym != NULL && sym->n_scnum == 0 && sym->n_value != 0)
334 /* This is a common symbol. The section contents include the
335 size (sym->n_value) as an addend. The relocate_section
336 function will be adding in the final value of the symbol. We
337 need to subtract out the current size in order to get the
340 BFD_ASSERT (h != NULL);
343 /* I think we *do* want to bypass this. If we don't, I have seen some data
344 parameters get the wrong relcation address. If I link two versions
345 with and without this section bypassed and then do a binary comparison,
346 the addresses which are different can be looked up in the map. The
347 case in which this section has been bypassed has addresses which correspond
348 to values I can find in the map */
349 *addendp -= sym->n_value;
352 /* If the output symbol is common (in which case this must be a
353 relocateable link), we need to add in the final size of the
355 if (h != NULL && h->root.type == bfd_link_hash_common)
356 *addendp += h->root.u.c.size;
361 #define coff_rtype_to_howto coff_i860_rtype_to_howto
363 #include "coffcode.h"
365 static const bfd_target *
369 return coff_object_p(a);
382 "coff-i860", /* name */
384 bfd_target_coff_flavour,
385 BFD_ENDIAN_LITTLE, /* data byte order is little */
386 BFD_ENDIAN_LITTLE, /* header byte order is little */
388 (HAS_RELOC | EXEC_P | /* object flags */
389 HAS_LINENO | HAS_DEBUG |
390 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
392 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
393 '_', /* leading underscore */
394 '/', /* ar_pad_char */
395 15, /* ar_max_namelen */
397 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
398 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
399 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
400 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
401 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
402 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
404 /* Note that we allow an object file to be treated as a core file as well. */
405 {_bfd_dummy_target, i3coff_object_p, /* bfd_check_format */
406 bfd_generic_archive_p, i3coff_object_p},
407 {bfd_false, coff_mkobject, _bfd_generic_mkarchive, /* bfd_set_format */
409 {bfd_false, coff_write_object_contents, /* bfd_write_contents */
410 _bfd_write_archive_contents, bfd_false},
412 BFD_JUMP_TABLE_GENERIC (coff),
413 BFD_JUMP_TABLE_COPY (coff),
414 BFD_JUMP_TABLE_CORE (_bfd_nocore),
415 BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
416 BFD_JUMP_TABLE_SYMBOLS (coff),
417 BFD_JUMP_TABLE_RELOCS (coff),
418 BFD_JUMP_TABLE_WRITE (coff),
419 BFD_JUMP_TABLE_LINK (coff),
420 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),