2001-01-01 Philip Blundell <philb@gnu.org>
[binutils.git] / bfd / coff-i860.c
blobc02acce861ea08935c22b398e3dec3bd58c77ea0
1 /* BFD back-end for Intel 860 COFF files.
2 Copyright 1990, 91, 92, 93, 94, 95, 97, 1999 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. */
22 #include "bfd.h"
23 #include "sysdep.h"
24 #include "libbfd.h"
26 #include "coff/i860.h"
28 #include "coff/internal.h"
30 #include "libcoff.h"
32 static bfd_reloc_status_type coff_i860_reloc
33 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
34 static reloc_howto_type *coff_i860_rtype_to_howto
35 PARAMS ((bfd *, asection *, struct internal_reloc *,
36 struct coff_link_hash_entry *, struct internal_syment *,
37 bfd_vma *));
39 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
40 /* The page size is a guess based on ELF. */
42 #define COFF_PAGE_SIZE 0x1000
44 /* For some reason when using i860 COFF the value stored in the .text
45 section for a reference to a common symbol is the value itself plus
46 any desired offset. Ian Taylor, Cygnus Support. */
48 /* If we are producing relocateable output, we need to do some
49 adjustments to the object file that are not done by the
50 bfd_perform_relocation function. This function is called by every
51 reloc type to make any required adjustments. */
53 static bfd_reloc_status_type
54 coff_i860_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd,
55 error_message)
56 bfd *abfd;
57 arelent *reloc_entry;
58 asymbol *symbol;
59 PTR data;
60 asection *input_section ATTRIBUTE_UNUSED;
61 bfd *output_bfd;
62 char **error_message ATTRIBUTE_UNUSED;
64 symvalue diff;
66 if (output_bfd == (bfd *) NULL)
67 return bfd_reloc_continue;
69 if (bfd_is_com_section (symbol->section))
71 /* We are relocating a common symbol. The current value in the
72 object file is ORIG + OFFSET, where ORIG is the value of the
73 common symbol as seen by the object file when it was compiled
74 (this may be zero if the symbol was undefined) and OFFSET is
75 the offset into the common symbol (normally zero, but may be
76 non-zero when referring to a field in a common structure).
77 ORIG is the negative of reloc_entry->addend, which is set by
78 the CALC_ADDEND macro below. We want to replace the value in
79 the object file with NEW + OFFSET, where NEW is the value of
80 the common symbol which we are going to put in the final
81 object file. NEW is symbol->value. */
82 diff = symbol->value + reloc_entry->addend;
84 else
86 /* For some reason bfd_perform_relocation always effectively
87 ignores the addend for a COFF target when producing
88 relocateable output. This seems to be always wrong for 860
89 COFF, so we handle the addend here instead. */
90 diff = reloc_entry->addend;
93 #define DOIT(x) \
94 x = ((x & ~howto->dst_mask) | (((x & howto->src_mask) + diff) & howto->dst_mask))
96 if (diff != 0)
98 reloc_howto_type *howto = reloc_entry->howto;
99 unsigned char *addr = (unsigned char *) data + reloc_entry->address;
101 switch (howto->size)
103 case 0:
105 char x = bfd_get_8 (abfd, addr);
106 DOIT (x);
107 bfd_put_8 (abfd, x, addr);
109 break;
111 case 1:
113 short x = bfd_get_16 (abfd, addr);
114 DOIT (x);
115 bfd_put_16 (abfd, x, addr);
117 break;
119 case 2:
121 long x = bfd_get_32 (abfd, addr);
122 DOIT (x);
123 bfd_put_32 (abfd, x, addr);
125 break;
127 default:
128 abort ();
132 /* Now let bfd_perform_relocation finish everything up. */
133 return bfd_reloc_continue;
136 #ifndef PCRELOFFSET
137 #define PCRELOFFSET false
138 #endif
140 static reloc_howto_type howto_table[] =
142 EMPTY_HOWTO (0),
143 EMPTY_HOWTO (1),
144 EMPTY_HOWTO (2),
145 EMPTY_HOWTO (3),
146 EMPTY_HOWTO (4),
147 EMPTY_HOWTO (5),
148 HOWTO (R_DIR32, /* type */
149 0, /* rightshift */
150 2, /* size (0 = byte, 1 = short, 2 = long) */
151 32, /* bitsize */
152 false, /* pc_relative */
153 0, /* bitpos */
154 complain_overflow_bitfield, /* complain_on_overflow */
155 coff_i860_reloc, /* special_function */
156 "dir32", /* name */
157 true, /* partial_inplace */
158 0xffffffff, /* src_mask */
159 0xffffffff, /* dst_mask */
160 true), /* pcrel_offset */
161 /* {7}, */
162 HOWTO (R_IMAGEBASE, /* type */
163 0, /* rightshift */
164 2, /* size (0 = byte, 1 = short, 2 = long) */
165 32, /* bitsize */
166 false, /* pc_relative */
167 0, /* bitpos */
168 complain_overflow_bitfield, /* complain_on_overflow */
169 coff_i860_reloc, /* special_function */
170 "rva32", /* name */
171 true, /* partial_inplace */
172 0xffffffff, /* src_mask */
173 0xffffffff, /* dst_mask */
174 false), /* pcrel_offset */
175 EMPTY_HOWTO (010),
176 EMPTY_HOWTO (011),
177 EMPTY_HOWTO (012),
178 EMPTY_HOWTO (013),
179 EMPTY_HOWTO (014),
180 EMPTY_HOWTO (015),
181 EMPTY_HOWTO (016),
182 HOWTO (R_RELBYTE, /* type */
183 0, /* rightshift */
184 0, /* size (0 = byte, 1 = short, 2 = long) */
185 8, /* bitsize */
186 false, /* pc_relative */
187 0, /* bitpos */
188 complain_overflow_bitfield, /* complain_on_overflow */
189 coff_i860_reloc, /* special_function */
190 "8", /* name */
191 true, /* partial_inplace */
192 0x000000ff, /* src_mask */
193 0x000000ff, /* dst_mask */
194 PCRELOFFSET), /* pcrel_offset */
195 HOWTO (R_RELWORD, /* type */
196 0, /* rightshift */
197 1, /* size (0 = byte, 1 = short, 2 = long) */
198 16, /* bitsize */
199 false, /* pc_relative */
200 0, /* bitpos */
201 complain_overflow_bitfield, /* complain_on_overflow */
202 coff_i860_reloc, /* special_function */
203 "16", /* name */
204 true, /* partial_inplace */
205 0x0000ffff, /* src_mask */
206 0x0000ffff, /* dst_mask */
207 PCRELOFFSET), /* pcrel_offset */
208 HOWTO (R_RELLONG, /* type */
209 0, /* rightshift */
210 2, /* size (0 = byte, 1 = short, 2 = long) */
211 32, /* bitsize */
212 false, /* pc_relative */
213 0, /* bitpos */
214 complain_overflow_bitfield, /* complain_on_overflow */
215 coff_i860_reloc, /* special_function */
216 "32", /* name */
217 true, /* partial_inplace */
218 0xffffffff, /* src_mask */
219 0xffffffff, /* dst_mask */
220 PCRELOFFSET), /* pcrel_offset */
221 HOWTO (R_PCRBYTE, /* type */
222 0, /* rightshift */
223 0, /* size (0 = byte, 1 = short, 2 = long) */
224 8, /* bitsize */
225 true, /* pc_relative */
226 0, /* bitpos */
227 complain_overflow_signed, /* complain_on_overflow */
228 coff_i860_reloc, /* special_function */
229 "DISP8", /* name */
230 true, /* partial_inplace */
231 0x000000ff, /* src_mask */
232 0x000000ff, /* dst_mask */
233 PCRELOFFSET), /* pcrel_offset */
234 HOWTO (R_PCRWORD, /* type */
235 0, /* rightshift */
236 1, /* size (0 = byte, 1 = short, 2 = long) */
237 16, /* bitsize */
238 true, /* pc_relative */
239 0, /* bitpos */
240 complain_overflow_signed, /* complain_on_overflow */
241 coff_i860_reloc, /* special_function */
242 "DISP16", /* name */
243 true, /* partial_inplace */
244 0x0000ffff, /* src_mask */
245 0x0000ffff, /* dst_mask */
246 PCRELOFFSET), /* pcrel_offset */
247 HOWTO (R_PCRLONG, /* type */
248 0, /* rightshift */
249 2, /* size (0 = byte, 1 = short, 2 = long) */
250 32, /* bitsize */
251 true, /* pc_relative */
252 0, /* bitpos */
253 complain_overflow_signed, /* complain_on_overflow */
254 coff_i860_reloc, /* special_function */
255 "DISP32", /* name */
256 true, /* partial_inplace */
257 0xffffffff, /* src_mask */
258 0xffffffff, /* dst_mask */
259 PCRELOFFSET) /* pcrel_offset */
262 /* Turn a howto into a reloc nunmber */
264 #define SELECT_RELOC(x,howto) { x.r_type = howto->type; }
265 #define BADMAG(x) I860BADMAG(x)
266 #define I860 1 /* Customize coffcode.h */
268 #define RTYPE2HOWTO(cache_ptr, dst) \
269 (cache_ptr)->howto = howto_table + (dst)->r_type;
271 /* For 860 COFF a STYP_NOLOAD | STYP_BSS section is part of a shared
272 library. On some other COFF targets STYP_BSS is normally
273 STYP_NOLOAD. */
274 #define BSS_NOLOAD_IS_SHARED_LIBRARY
276 /* Compute the addend of a reloc. If the reloc is to a common symbol,
277 the object file contains the value of the common symbol. By the
278 time this is called, the linker may be using a different symbol
279 from a different object file with a different value. Therefore, we
280 hack wildly to locate the original symbol from this file so that we
281 can make the correct adjustment. This macro sets coffsym to the
282 symbol from the original file, and uses it to set the addend value
283 correctly. If this is not a common symbol, the usual addend
284 calculation is done, except that an additional tweak is needed for
285 PC relative relocs.
286 FIXME: This macro refers to symbols and asect; these are from the
287 calling function, not the macro arguments. */
289 #define CALC_ADDEND(abfd, ptr, reloc, cache_ptr) \
291 coff_symbol_type *coffsym = (coff_symbol_type *) NULL; \
292 if (ptr && bfd_asymbol_bfd (ptr) != abfd) \
293 coffsym = (obj_symbols (abfd) \
294 + (cache_ptr->sym_ptr_ptr - symbols)); \
295 else if (ptr) \
296 coffsym = coff_symbol_from (abfd, ptr); \
297 if (coffsym != (coff_symbol_type *) NULL \
298 && coffsym->native->u.syment.n_scnum == 0) \
299 cache_ptr->addend = - coffsym->native->u.syment.n_value; \
300 else if (ptr && bfd_asymbol_bfd (ptr) == abfd \
301 && ptr->section != (asection *) NULL) \
302 cache_ptr->addend = - (ptr->section->vma + ptr->value); \
303 else \
304 cache_ptr->addend = 0; \
305 if (ptr && howto_table[reloc.r_type].pc_relative) \
306 cache_ptr->addend += asect->vma; \
309 /* We use the special COFF backend linker. */
310 #define coff_relocate_section _bfd_coff_generic_relocate_section
312 static reloc_howto_type *
313 coff_i860_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
314 bfd *abfd ATTRIBUTE_UNUSED;
315 asection *sec;
316 struct internal_reloc *rel;
317 struct coff_link_hash_entry *h;
318 struct internal_syment *sym;
319 bfd_vma *addendp;
322 reloc_howto_type *howto;
324 howto = howto_table + rel->r_type;
326 if (howto->pc_relative)
327 *addendp += sec->vma;
329 if (sym != NULL && sym->n_scnum == 0 && sym->n_value != 0)
331 /* This is a common symbol. The section contents include the
332 size (sym->n_value) as an addend. The relocate_section
333 function will be adding in the final value of the symbol. We
334 need to subtract out the current size in order to get the
335 correct result. */
337 BFD_ASSERT (h != NULL);
339 /* I think we *do* want to bypass this. If we don't, I have seen some data
340 parameters get the wrong relcation address. If I link two versions
341 with and without this section bypassed and then do a binary comparison,
342 the addresses which are different can be looked up in the map. The
343 case in which this section has been bypassed has addresses which correspond
344 to values I can find in the map */
345 *addendp -= sym->n_value;
348 /* If the output symbol is common (in which case this must be a
349 relocateable link), we need to add in the final size of the
350 common symbol. */
351 if (h != NULL && h->root.type == bfd_link_hash_common)
352 *addendp += h->root.u.c.size;
354 return howto;
357 #define coff_rtype_to_howto coff_i860_rtype_to_howto
359 #include "coffcode.h"
361 static const bfd_target *
362 i3coff_object_p(a)
363 bfd *a;
365 return coff_object_p(a);
368 const bfd_target
369 #ifdef TARGET_SYM
370 TARGET_SYM =
371 #else
372 i860coff_vec =
373 #endif
375 #ifdef TARGET_NAME
376 TARGET_NAME,
377 #else
378 "coff-i860", /* name */
379 #endif
380 bfd_target_coff_flavour,
381 BFD_ENDIAN_LITTLE, /* data byte order is little */
382 BFD_ENDIAN_LITTLE, /* header byte order is little */
384 (HAS_RELOC | EXEC_P | /* object flags */
385 HAS_LINENO | HAS_DEBUG |
386 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
388 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
389 '_', /* leading underscore */
390 '/', /* ar_pad_char */
391 15, /* ar_max_namelen */
393 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
394 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
395 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
396 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
397 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
398 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
400 /* Note that we allow an object file to be treated as a core file as well. */
401 {_bfd_dummy_target, i3coff_object_p, /* bfd_check_format */
402 bfd_generic_archive_p, i3coff_object_p},
403 {bfd_false, coff_mkobject, _bfd_generic_mkarchive, /* bfd_set_format */
404 bfd_false},
405 {bfd_false, coff_write_object_contents, /* bfd_write_contents */
406 _bfd_write_archive_contents, bfd_false},
408 BFD_JUMP_TABLE_GENERIC (coff),
409 BFD_JUMP_TABLE_COPY (coff),
410 BFD_JUMP_TABLE_CORE (_bfd_nocore),
411 BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
412 BFD_JUMP_TABLE_SYMBOLS (coff),
413 BFD_JUMP_TABLE_RELOCS (coff),
414 BFD_JUMP_TABLE_WRITE (coff),
415 BFD_JUMP_TABLE_LINK (coff),
416 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
418 NULL,
420 COFF_SWAP_TABLE