2009-06-12 Tristan Gingold <gingold@adacore.com>
[binutils.git] / bfd / coff-or32.c
blob9f57eb06eecde2da02a993bf8462d467a24b4aef
1 /* BFD back-end for OpenRISC 1000 COFF binaries.
2 Copyright 2002, 2003, 2004, 2005, 2007, 2008
3 Free Software Foundation, Inc.
4 Contributed by Ivan Guzvinec <ivang@opencores.org>
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 3 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., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
23 #define OR32 1
25 #include "sysdep.h"
26 #include "bfd.h"
27 #include "libbfd.h"
28 #include "coff/or32.h"
29 #include "coff/internal.h"
30 #include "libcoff.h"
32 static long get_symbol_value
33 PARAMS ((asymbol *));
34 static bfd_reloc_status_type or32_reloc
35 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
36 static bfd_boolean coff_or32_relocate_section
37 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
38 struct internal_reloc *, struct internal_syment *, asection **));
39 static bfd_boolean coff_or32_adjust_symndx
40 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *,
41 struct internal_reloc *, bfd_boolean *));
42 static void reloc_processing
43 PARAMS ((arelent *, struct internal_reloc *, asymbol **, bfd *, asection *));
45 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
47 #define INSERT_HWORD(WORD,HWORD) \
48 (((WORD) & 0xffff0000) | ((HWORD)& 0x0000ffff))
49 #define EXTRACT_HWORD(WORD) \
50 ((WORD) & 0x0000ffff)
51 #define SIGN_EXTEND_HWORD(HWORD) \
52 ((HWORD) & 0x8000 ? (HWORD)|(~0xffffL) : (HWORD))
54 #define INSERT_JUMPTARG(WORD,JT) \
55 (((WORD) & 0xfc000000) | ((JT)& 0x03ffffff))
56 #define EXTRACT_JUMPTARG(WORD) \
57 ((WORD) & 0x03ffffff)
58 #define SIGN_EXTEND_JUMPTARG(JT) \
59 ((JT) & 0x04000000 ? (JT)|(~0x03ffffffL) : (JT))
61 /* Provided the symbol, returns the value reffed. */
63 static long
64 get_symbol_value (symbol)
65 asymbol *symbol;
67 long relocation = 0;
69 if (bfd_is_com_section (symbol->section))
70 relocation = 0;
71 else
72 relocation = symbol->value +
73 symbol->section->output_section->vma +
74 symbol->section->output_offset;
76 return relocation;
79 /* This function is in charge of performing all the or32 relocations. */
81 static bfd_reloc_status_type
82 or32_reloc (abfd, reloc_entry, symbol_in, data, input_section, output_bfd,
83 error_message)
84 bfd *abfd;
85 arelent *reloc_entry;
86 asymbol *symbol_in;
87 PTR data;
88 asection *input_section;
89 bfd *output_bfd;
90 char **error_message;
92 /* The consth relocation comes in two parts, we have to remember
93 the state between calls, in these variables. */
94 static bfd_boolean part1_consth_active = FALSE;
95 static unsigned long part1_consth_value;
97 unsigned long insn;
98 unsigned long sym_value;
99 unsigned long unsigned_value;
100 unsigned short r_type;
101 long signed_value;
103 unsigned long addr = reloc_entry->address ; /*+ input_section->vma*/
104 bfd_byte *hit_data =addr + (bfd_byte *)(data);
106 r_type = reloc_entry->howto->type;
108 if (output_bfd)
110 /* Partial linking - do nothing. */
111 reloc_entry->address += input_section->output_offset;
112 return bfd_reloc_ok;
115 if (symbol_in != NULL
116 && bfd_is_und_section (symbol_in->section))
118 /* Keep the state machine happy in case we're called again. */
119 if (r_type == R_IHIHALF)
121 part1_consth_active = TRUE;
122 part1_consth_value = 0;
125 return bfd_reloc_undefined;
128 if ((part1_consth_active) && (r_type != R_IHCONST))
130 part1_consth_active = FALSE;
131 *error_message = (char *) "Missing IHCONST";
133 return bfd_reloc_dangerous;
136 sym_value = get_symbol_value (symbol_in);
138 switch (r_type)
140 case R_IREL:
141 insn = bfd_get_32(abfd, hit_data);
143 /* Take the value in the field and sign extend it. */
144 signed_value = EXTRACT_JUMPTARG (insn);
145 signed_value = SIGN_EXTEND_JUMPTARG (signed_value);
146 signed_value <<= 2;
148 /* See the note on the R_IREL reloc in coff_or32_relocate_section. */
149 if (signed_value == - (long) reloc_entry->address)
150 signed_value = 0;
152 signed_value += sym_value + reloc_entry->addend;
153 /* Relative jmp/call, so subtract from the value the
154 address of the place we're coming from. */
155 signed_value -= (reloc_entry->address
156 + input_section->output_section->vma
157 + input_section->output_offset);
158 if (signed_value > 0x7ffffff || signed_value < -0x8000000)
159 return bfd_reloc_overflow;
161 signed_value >>= 2;
162 insn = INSERT_JUMPTARG (insn, signed_value);
163 bfd_put_32 (abfd, insn, hit_data);
164 break;
166 case R_ILOHALF:
167 insn = bfd_get_32 (abfd, hit_data);
168 unsigned_value = EXTRACT_HWORD (insn);
169 unsigned_value += sym_value + reloc_entry->addend;
170 insn = INSERT_HWORD (insn, unsigned_value);
171 bfd_put_32 (abfd, insn, hit_data);
172 break;
174 case R_IHIHALF:
175 insn = bfd_get_32 (abfd, hit_data);
177 /* consth, part 1
178 Just get the symbol value that is referenced. */
179 part1_consth_active = TRUE;
180 part1_consth_value = sym_value + reloc_entry->addend;
182 /* Don't modify insn until R_IHCONST. */
183 break;
185 case R_IHCONST:
186 insn = bfd_get_32 (abfd, hit_data);
188 /* consth, part 2
189 Now relocate the reference. */
190 if (! part1_consth_active)
192 *error_message = (char *) "Missing IHIHALF";
193 return bfd_reloc_dangerous;
196 /* sym_ptr_ptr = r_symndx, in coff_slurp_reloc_table() */
197 unsigned_value = 0; /*EXTRACT_HWORD(insn) << 16;*/
198 unsigned_value += reloc_entry->addend; /* r_symndx */
199 unsigned_value += part1_consth_value;
200 unsigned_value = unsigned_value >> 16;
201 insn = INSERT_HWORD (insn, unsigned_value);
202 part1_consth_active = FALSE;
203 bfd_put_32 (abfd, insn, hit_data);
204 break;
206 case R_BYTE:
207 insn = bfd_get_8 (abfd, hit_data);
208 unsigned_value = insn + sym_value + reloc_entry->addend;
209 if (unsigned_value & 0xffffff00)
210 return bfd_reloc_overflow;
211 bfd_put_8 (abfd, unsigned_value, hit_data);
212 break;
214 case R_HWORD:
215 insn = bfd_get_16 (abfd, hit_data);
216 unsigned_value = insn + sym_value + reloc_entry->addend;
217 if (unsigned_value & 0xffff0000)
218 return bfd_reloc_overflow;
219 bfd_put_16 (abfd, insn, hit_data);
220 break;
222 case R_WORD:
223 insn = bfd_get_32 (abfd, hit_data);
224 insn += sym_value + reloc_entry->addend;
225 bfd_put_32 (abfd, insn, hit_data);
226 break;
228 default:
229 *error_message = _("Unrecognized reloc");
230 return bfd_reloc_dangerous;
233 return bfd_reloc_ok;
236 /* type rightshift
237 size
238 bitsize
239 pc-relative
240 bitpos
241 absolute
242 complain_on_overflow
243 special_function
244 relocation name
245 partial_inplace
246 src_mask
249 /* FIXME: I'm not real sure about this table. */
250 static reloc_howto_type howto_table[] =
252 { R_ABS, 0, 3, 32, FALSE, 0, complain_overflow_bitfield, or32_reloc, "ABS", TRUE, 0xffffffff,0xffffffff, FALSE },
253 EMPTY_HOWTO (1),
254 EMPTY_HOWTO (2),
255 EMPTY_HOWTO (3),
256 EMPTY_HOWTO (4),
257 EMPTY_HOWTO (5),
258 EMPTY_HOWTO (6),
259 EMPTY_HOWTO (7),
260 EMPTY_HOWTO (8),
261 EMPTY_HOWTO (9),
262 EMPTY_HOWTO (10),
263 EMPTY_HOWTO (11),
264 EMPTY_HOWTO (12),
265 EMPTY_HOWTO (13),
266 EMPTY_HOWTO (14),
267 EMPTY_HOWTO (15),
268 EMPTY_HOWTO (16),
269 EMPTY_HOWTO (17),
270 EMPTY_HOWTO (18),
271 EMPTY_HOWTO (19),
272 EMPTY_HOWTO (20),
273 EMPTY_HOWTO (21),
274 EMPTY_HOWTO (22),
275 EMPTY_HOWTO (23),
276 { R_IREL, 0, 3, 32, TRUE, 0, complain_overflow_signed, or32_reloc, "IREL", TRUE, 0xffffffff,0xffffffff, FALSE },
277 { R_IABS, 0, 3, 32, FALSE, 0, complain_overflow_bitfield, or32_reloc, "IABS", TRUE, 0xffffffff,0xffffffff, FALSE },
278 { R_ILOHALF, 0, 3, 16, TRUE, 0, complain_overflow_signed, or32_reloc, "ILOHALF", TRUE, 0x0000ffff,0x0000ffff, FALSE },
279 { R_IHIHALF, 0, 3, 16, TRUE, 16,complain_overflow_signed, or32_reloc, "IHIHALF", TRUE, 0xffff0000,0xffff0000, FALSE },
280 { R_IHCONST, 0, 3, 16, TRUE, 0, complain_overflow_signed, or32_reloc, "IHCONST", TRUE, 0xffff0000,0xffff0000, FALSE },
281 { R_BYTE, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, or32_reloc, "BYTE", TRUE, 0x000000ff,0x000000ff, FALSE },
282 { R_HWORD, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, or32_reloc, "HWORD", TRUE, 0x0000ffff,0x0000ffff, FALSE },
283 { R_WORD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, or32_reloc, "WORD", TRUE, 0xffffffff,0xffffffff, FALSE },
286 #define BADMAG(x) OR32BADMAG (x)
288 #define RELOC_PROCESSING(relent, reloc, symbols, abfd, section) \
289 reloc_processing (relent, reloc, symbols, abfd, section)
291 static void
292 reloc_processing (relent,reloc, symbols, abfd, section)
293 arelent *relent;
294 struct internal_reloc *reloc;
295 asymbol **symbols;
296 bfd *abfd;
297 asection *section;
299 static bfd_vma ihihalf_vaddr = (bfd_vma) -1;
301 relent->address = reloc->r_vaddr;
302 relent->howto = howto_table + reloc->r_type;
304 if (reloc->r_type == R_IHCONST)
306 /* The address of an R_IHCONST should always be the address of
307 the immediately preceding R_IHIHALF. relocs generated by gas
308 are correct, but relocs generated by High C are different (I
309 can't figure out what the address means for High C). We can
310 handle both gas and High C by ignoring the address here, and
311 simply reusing the address saved for R_IHIHALF. */
312 if (ihihalf_vaddr == (bfd_vma) -1)
313 abort ();
315 relent->address = ihihalf_vaddr;
316 ihihalf_vaddr = (bfd_vma) -1;
317 relent->addend = reloc->r_symndx;
318 relent->sym_ptr_ptr= bfd_abs_section_ptr->symbol_ptr_ptr;
320 else
322 relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
323 relent->addend = 0;
324 relent->address-= section->vma;
326 if (reloc->r_type == R_IHIHALF)
327 ihihalf_vaddr = relent->address;
328 else if (ihihalf_vaddr != (bfd_vma) -1)
329 abort ();
333 /* The reloc processing routine for the optimized COFF linker. */
335 static bfd_boolean
336 coff_or32_relocate_section (output_bfd, info, input_bfd, input_section,
337 contents, relocs, syms, sections)
338 bfd *output_bfd ATTRIBUTE_UNUSED;
339 struct bfd_link_info *info;
340 bfd *input_bfd;
341 asection *input_section;
342 bfd_byte *contents;
343 struct internal_reloc *relocs;
344 struct internal_syment *syms;
345 asection **sections;
347 struct internal_reloc *rel;
348 struct internal_reloc *relend;
349 bfd_boolean hihalf;
350 bfd_vma hihalf_val;
352 /* If we are performing a relocatable link, we don't need to do a
353 thing. The caller will take care of adjusting the reloc
354 addresses and symbol indices. */
355 if (info->relocatable)
356 return TRUE;
358 hihalf = FALSE;
359 hihalf_val = 0;
361 rel = relocs;
362 relend = rel + input_section->reloc_count;
364 for (; rel < relend; rel++)
366 long symndx;
367 bfd_byte *loc;
368 struct coff_link_hash_entry *h;
369 struct internal_syment *sym;
370 asection *sec;
371 bfd_vma val;
372 bfd_boolean overflow;
373 unsigned long insn;
374 long signed_value;
375 unsigned long unsigned_value;
376 bfd_reloc_status_type rstat;
378 symndx = rel->r_symndx;
379 loc = contents + rel->r_vaddr - input_section->vma;
381 if (symndx == -1 || rel->r_type == R_IHCONST)
382 h = NULL;
383 else
384 h = obj_coff_sym_hashes (input_bfd)[symndx];
386 sym = NULL;
387 sec = NULL;
388 val = 0;
390 /* An R_IHCONST reloc does not have a symbol. Instead, the
391 symbol index is an addend. R_IHCONST is always used in
392 conjunction with R_IHHALF. */
393 if (rel->r_type != R_IHCONST)
395 if (h == NULL)
397 if (symndx == -1)
398 sec = bfd_abs_section_ptr;
399 else
401 sym = syms + symndx;
402 sec = sections[symndx];
403 val = (sec->output_section->vma
404 + sec->output_offset
405 + sym->n_value
406 - sec->vma);
409 else
411 if (h->root.type == bfd_link_hash_defined
412 || h->root.type == bfd_link_hash_defweak)
414 sec = h->root.u.def.section;
415 val = (h->root.u.def.value
416 + sec->output_section->vma
417 + sec->output_offset);
419 else
421 if (! ((*info->callbacks->undefined_symbol)
422 (info, h->root.root.string, input_bfd, input_section,
423 rel->r_vaddr - input_section->vma, TRUE)))
424 return FALSE;
428 if (hihalf)
430 if (! ((*info->callbacks->reloc_dangerous)
431 (info, "missing IHCONST reloc", input_bfd,
432 input_section, rel->r_vaddr - input_section->vma)))
433 return FALSE;
434 hihalf = FALSE;
438 overflow = FALSE;
440 switch (rel->r_type)
442 default:
443 bfd_set_error (bfd_error_bad_value);
444 return FALSE;
446 case R_IREL:
447 insn = bfd_get_32 (input_bfd, loc);
449 /* Extract the addend. */
450 signed_value = EXTRACT_JUMPTARG (insn);
451 signed_value = SIGN_EXTEND_JUMPTARG (signed_value);
452 signed_value <<= 2;
454 /* Determine the destination of the jump. */
455 signed_value += val;
457 /* Make the destination PC relative. */
458 signed_value -= (input_section->output_section->vma
459 + input_section->output_offset
460 + (rel->r_vaddr - input_section->vma));
461 if (signed_value > 0x7ffffff || signed_value < - 0x8000000)
463 overflow = TRUE;
464 signed_value = 0;
467 /* Put the adjusted value back into the instruction. */
468 signed_value >>= 2;
469 insn = INSERT_JUMPTARG(insn, signed_value);
471 bfd_put_32 (input_bfd, (bfd_vma) insn, loc);
472 break;
474 case R_ILOHALF:
475 insn = bfd_get_32 (input_bfd, loc);
476 unsigned_value = EXTRACT_HWORD (insn);
477 unsigned_value += val;
478 insn = INSERT_HWORD (insn, unsigned_value);
479 bfd_put_32 (input_bfd, insn, loc);
480 break;
482 case R_IHIHALF:
483 /* Save the value for the R_IHCONST reloc. */
484 hihalf = TRUE;
485 hihalf_val = val;
486 break;
488 case R_IHCONST:
489 if (! hihalf)
491 if (! ((*info->callbacks->reloc_dangerous)
492 (info, "missing IHIHALF reloc", input_bfd,
493 input_section, rel->r_vaddr - input_section->vma)))
494 return FALSE;
495 hihalf_val = 0;
498 insn = bfd_get_32 (input_bfd, loc);
499 unsigned_value = rel->r_symndx + hihalf_val;
500 unsigned_value >>= 16;
501 insn = INSERT_HWORD (insn, unsigned_value);
502 bfd_put_32 (input_bfd, (bfd_vma) insn, loc);
504 hihalf = FALSE;
505 break;
507 case R_BYTE:
508 case R_HWORD:
509 case R_WORD:
510 rstat = _bfd_relocate_contents (howto_table + rel->r_type,
511 input_bfd, val, loc);
512 if (rstat == bfd_reloc_overflow)
513 overflow = TRUE;
514 else if (rstat != bfd_reloc_ok)
515 abort ();
516 break;
519 if (overflow)
521 const char *name;
522 char buf[SYMNMLEN + 1];
524 if (symndx == -1)
525 name = "*ABS*";
526 else if (h != NULL)
527 name = NULL;
528 else if (sym == NULL)
529 name = "*unknown*";
530 else if (sym->_n._n_n._n_zeroes == 0
531 && sym->_n._n_n._n_offset != 0)
532 name = obj_coff_strings (input_bfd) + sym->_n._n_n._n_offset;
533 else
535 strncpy (buf, sym->_n._n_name, SYMNMLEN);
536 buf[SYMNMLEN] = '\0';
537 name = buf;
540 if (! ((*info->callbacks->reloc_overflow)
541 (info, (h ? &h->root : NULL), name,
542 howto_table[rel->r_type].name, (bfd_vma) 0, input_bfd,
543 input_section, rel->r_vaddr - input_section->vma)))
544 return FALSE;
548 return TRUE;
551 #define coff_relocate_section coff_or32_relocate_section
553 /* We don't want to change the symndx of a R_IHCONST reloc, since it
554 is actually an addend, not a symbol index at all. */
556 static bfd_boolean
557 coff_or32_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp)
558 bfd *obfd ATTRIBUTE_UNUSED;
559 struct bfd_link_info *info ATTRIBUTE_UNUSED;
560 bfd *ibfd ATTRIBUTE_UNUSED;
561 asection *sec ATTRIBUTE_UNUSED;
562 struct internal_reloc *irel;
563 bfd_boolean *adjustedp;
565 if (irel->r_type == R_IHCONST)
566 *adjustedp = TRUE;
567 else
568 *adjustedp = FALSE;
569 return TRUE;
572 #define coff_adjust_symndx coff_or32_adjust_symndx
574 #ifndef bfd_pe_print_pdata
575 #define bfd_pe_print_pdata NULL
576 #endif
578 #include "coffcode.h"
580 const bfd_target or32coff_big_vec =
582 "coff-or32-big", /* Name. */
583 bfd_target_coff_flavour,
584 BFD_ENDIAN_BIG, /* Data byte order is big. */
585 BFD_ENDIAN_BIG, /* Header byte order is big. */
587 (HAS_RELOC | EXEC_P | /* Object flags. */
588 HAS_LINENO | HAS_DEBUG |
589 HAS_SYMS | HAS_LOCALS | WP_TEXT),
591 (SEC_HAS_CONTENTS | SEC_ALLOC | /* Section flags. */
592 SEC_LOAD | SEC_RELOC |
593 SEC_READONLY ),
594 '_', /* Leading underscore. */
595 '/', /* ar_pad_char. */
596 15, /* ar_max_namelen. */
598 /* Data. */
599 bfd_getb64, bfd_getb_signed_64, bfd_putb64,
600 bfd_getb32, bfd_getb_signed_32, bfd_putb32,
601 bfd_getb16, bfd_getb_signed_16, bfd_putb16,
603 /* Headers. */
604 bfd_getb64, bfd_getb_signed_64, bfd_putb64,
605 bfd_getb32, bfd_getb_signed_32, bfd_putb32,
606 bfd_getb16, bfd_getb_signed_16, bfd_putb16,
609 _bfd_dummy_target,
610 coff_object_p,
611 bfd_generic_archive_p,
612 _bfd_dummy_target
615 bfd_false,
616 coff_mkobject,
617 _bfd_generic_mkarchive,
618 bfd_false
621 bfd_false,
622 coff_write_object_contents,
623 _bfd_write_archive_contents,
624 bfd_false
627 BFD_JUMP_TABLE_GENERIC (coff),
628 BFD_JUMP_TABLE_COPY (coff),
629 BFD_JUMP_TABLE_CORE (_bfd_nocore),
630 BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
631 BFD_JUMP_TABLE_SYMBOLS (coff),
632 BFD_JUMP_TABLE_RELOCS (coff),
633 BFD_JUMP_TABLE_WRITE (coff),
634 BFD_JUMP_TABLE_LINK (coff),
635 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
637 /* Alternative_target. */
638 #ifdef TARGET_LITTLE_SYM
639 & TARGET_LITTLE_SYM,
640 #else
641 NULL,
642 #endif
644 COFF_SWAP_TABLE