1 /* BFD back-end for MIPS PE COFF files.
2 Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
3 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
4 Modified from coff-i386.c by DJ Delorie, dj@cygnus.com
5
6 This file is part of BFD, the Binary File Descriptor library.
7
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.
12
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.
17
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. */
21
22 #define COFF_WITH_PE
23 #define COFF_LONG_SECTION_NAMES
24 #define PCRELOFFSET TRUE
25
26 #include "bfd.h"
27 #include "sysdep.h"
28 #include "libbfd.h"
29
30 #include "coff/mipspe.h"
31
32 #include "coff/internal.h"
33
34 #include "coff/pe.h"
35
36 #include "libcoff.h"
37
38 static bfd_reloc_status_type coff_mips_reloc
39 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
40 static reloc_howto_type *coff_mips_rtype_to_howto
41 PARAMS ((bfd *, asection *, struct internal_reloc *,
42 struct coff_link_hash_entry *, struct internal_syment *,
43 bfd_vma *));
44 #if 0
45 static void mips_ecoff_swap_reloc_in
46 PARAMS ((bfd *, PTR, struct internal_reloc *));
47 static void mips_ecoff_swap_reloc_out
48 PARAMS ((bfd *, const struct internal_reloc *, PTR));
49 static void mips_adjust_reloc_in
50 PARAMS ((bfd *, const struct internal_reloc *, arelent *));
51 static void mips_adjust_reloc_out
52 PARAMS ((bfd *, const arelent *, struct internal_reloc *));
53 #endif
54
55 static bfd_boolean in_reloc_p
56 PARAMS ((bfd *, reloc_howto_type *));
57 static reloc_howto_type * coff_mips_reloc_type_lookup
58 PARAMS ((bfd *, bfd_reloc_code_real_type));
59 static void mips_swap_reloc_in
60 PARAMS ((bfd *, PTR, PTR));
61 static unsigned int mips_swap_reloc_out
62 PARAMS ((bfd *, PTR, PTR));
63 static bfd_boolean coff_pe_mips_relocate_section
64 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
65 struct internal_reloc *, struct internal_syment *, asection **));
66
67 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
68 /* The page size is a guess based on ELF. */
69
70 #define COFF_PAGE_SIZE 0x1000
71
72 /* For some reason when using mips COFF the value stored in the .text
73 section for a reference to a common symbol is the value itself plus
74 any desired offset. Ian Taylor, Cygnus Support. */
75
76 /* If we are producing relocatable output, we need to do some
77 adjustments to the object file that are not done by the
78 bfd_perform_relocation function. This function is called by every
79 reloc type to make any required adjustments. */
80
81 static bfd_reloc_status_type
coff_mips_reloc(abfd,reloc_entry,symbol,data,input_section,output_bfd,error_message)82 coff_mips_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd,
83 error_message)
84 bfd *abfd;
85 arelent *reloc_entry;
86 asymbol *symbol;
87 PTR data;
88 asection *input_section ATTRIBUTE_UNUSED;
89 bfd *output_bfd;
90 char **error_message ATTRIBUTE_UNUSED;
91 {
92 symvalue diff;
93
94 if (output_bfd == (bfd *) NULL)
95 return bfd_reloc_continue;
96
97 if (bfd_is_com_section (symbol->section))
98 {
99 #ifndef COFF_WITH_PE
100 /* We are relocating a common symbol. The current value in the
101 object file is ORIG + OFFSET, where ORIG is the value of the
102 common symbol as seen by the object file when it was compiled
103 (this may be zero if the symbol was undefined) and OFFSET is
104 the offset into the common symbol (normally zero, but may be
105 non-zero when referring to a field in a common structure).
106 ORIG is the negative of reloc_entry->addend, which is set by
107 the CALC_ADDEND macro below. We want to replace the value in
108 the object file with NEW + OFFSET, where NEW is the value of
109 the common symbol which we are going to put in the final
110 object file. NEW is symbol->value. */
111 diff = symbol->value + reloc_entry->addend;
112 #else
113 /* In PE mode, we do not offset the common symbol. */
114 diff = reloc_entry->addend;
115 #endif
116 }
117 else
118 {
119 /* For some reason bfd_perform_relocation always effectively
120 ignores the addend for a COFF target when producing
121 relocatable output. This seems to be always wrong for 386
122 COFF, so we handle the addend here instead. */
123 diff = reloc_entry->addend;
124 }
125
126 #ifdef COFF_WITH_PE
127 #if 0
128 /* dj - handle it like any other reloc? */
129 /* FIXME: How should this case be handled? */
130 if (reloc_entry->howto->type == MIPS_R_RVA && diff != 0)
131 abort ();
132 #endif
133 #endif
134
135 #define DOIT(x) \
136 x = ((x & ~howto->dst_mask) | (((x & howto->src_mask) + (diff >> howto->rightshift)) & howto->dst_mask))
137
138 if (diff != 0)
139 {
140 reloc_howto_type *howto = reloc_entry->howto;
141 unsigned char *addr = (unsigned char *) data + reloc_entry->address;
142
143 switch (howto->size)
144 {
145 case 0:
146 {
147 char x = bfd_get_8 (abfd, addr);
148 DOIT (x);
149 bfd_put_8 (abfd, x, addr);
150 }
151 break;
152
153 case 1:
154 {
155 short x = bfd_get_16 (abfd, addr);
156 DOIT (x);
157 bfd_put_16 (abfd, (bfd_vma) x, addr);
158 }
159 break;
160
161 case 2:
162 {
163 long x = bfd_get_32 (abfd, addr);
164 DOIT (x);
165 bfd_put_32 (abfd, (bfd_vma) x, addr);
166 }
167 break;
168
169 default:
170 abort ();
171 }
172 }
173
174 /* Now let bfd_perform_relocation finish everything up. */
175 return bfd_reloc_continue;
176 }
177
178 #ifdef COFF_WITH_PE
179 /* Return TRUE if this relocation should
180 appear in the output .reloc section. */
181
182 static bfd_boolean
in_reloc_p(abfd,howto)183 in_reloc_p (abfd, howto)
184 bfd * abfd ATTRIBUTE_UNUSED;
185 reloc_howto_type *howto;
186 {
187 return ! howto->pc_relative && howto->type != MIPS_R_RVA;
188 }
189 #endif
190
191 #ifndef PCRELOFFSET
192 #define PCRELOFFSET FALSE
193 #endif
194
195 static reloc_howto_type howto_table[] =
196 {
197 /* Reloc type 0 is ignored. The reloc reading code ensures that
198 this is a reference to the .abs section, which will cause
199 bfd_perform_relocation to do nothing. */
200 HOWTO (MIPS_R_ABSOLUTE, /* type */
201 0, /* rightshift */
202 0, /* size (0 = byte, 1 = short, 2 = long) */
203 8, /* bitsize */
204 FALSE, /* pc_relative */
205 0, /* bitpos */
206 complain_overflow_dont, /* complain_on_overflow */
207 0, /* special_function */
208 "IGNORE", /* name */
209 FALSE, /* partial_inplace */
210 0, /* src_mask */
211 0, /* dst_mask */
212 FALSE), /* pcrel_offset */
213
214 /* A 16 bit reference to a symbol, normally from a data section. */
215 HOWTO (MIPS_R_REFHALF, /* type */
216 0, /* rightshift */
217 1, /* size (0 = byte, 1 = short, 2 = long) */
218 16, /* bitsize */
219 FALSE, /* pc_relative */
220 0, /* bitpos */
221 complain_overflow_bitfield, /* complain_on_overflow */
222 coff_mips_reloc, /* special_function */
223 "REFHALF", /* name */
224 TRUE, /* partial_inplace */
225 0xffff, /* src_mask */
226 0xffff, /* dst_mask */
227 FALSE), /* pcrel_offset */
228
229 /* A 32 bit reference to a symbol, normally from a data section. */
230 HOWTO (MIPS_R_REFWORD, /* type */
231 0, /* rightshift */
232 2, /* size (0 = byte, 1 = short, 2 = long) */
233 32, /* bitsize */
234 FALSE, /* pc_relative */
235 0, /* bitpos */
236 complain_overflow_bitfield, /* complain_on_overflow */
237 coff_mips_reloc, /* special_function */
238 "REFWORD", /* name */
239 TRUE, /* partial_inplace */
240 0xffffffff, /* src_mask */
241 0xffffffff, /* dst_mask */
242 FALSE), /* pcrel_offset */
243
244 /* A 26 bit absolute jump address. */
245 HOWTO (MIPS_R_JMPADDR, /* type */
246 2, /* rightshift */
247 2, /* size (0 = byte, 1 = short, 2 = long) */
248 26, /* bitsize */
249 FALSE, /* pc_relative */
250 0, /* bitpos */
251 complain_overflow_dont, /* complain_on_overflow */
252 /* This needs complex overflow
253 detection, because the upper four
254 bits must match the PC. */
255 coff_mips_reloc, /* special_function */
256 "JMPADDR", /* name */
257 TRUE, /* partial_inplace */
258 0x3ffffff, /* src_mask */
259 0x3ffffff, /* dst_mask */
260 FALSE), /* pcrel_offset */
261
262 /* The high 16 bits of a symbol value. Handled by the function
263 mips_refhi_reloc. */
264 HOWTO (MIPS_R_REFHI, /* type */
265 16, /* rightshift */
266 2, /* size (0 = byte, 1 = short, 2 = long) */
267 16, /* bitsize */
268 FALSE, /* pc_relative */
269 0, /* bitpos */
270 complain_overflow_bitfield, /* complain_on_overflow */
271 coff_mips_reloc, /* special_function */
272 "REFHI", /* name */
273 TRUE, /* partial_inplace */
274 0xffff, /* src_mask */
275 0xffff, /* dst_mask */
276 FALSE), /* pcrel_offset */
277
278 /* The low 16 bits of a symbol value. */
279 HOWTO (MIPS_R_REFLO, /* type */
280 0, /* rightshift */
281 2, /* size (0 = byte, 1 = short, 2 = long) */
282 16, /* bitsize */
283 FALSE, /* pc_relative */
284 0, /* bitpos */
285 complain_overflow_dont, /* complain_on_overflow */
286 coff_mips_reloc, /* special_function */
287 "REFLO", /* name */
288 TRUE, /* partial_inplace */
289 0xffff, /* src_mask */
290 0xffff, /* dst_mask */
291 FALSE), /* pcrel_offset */
292
293 /* A reference to an offset from the gp register. Handled by the
294 function mips_gprel_reloc. */
295 HOWTO (MIPS_R_GPREL, /* type */
296 0, /* rightshift */
297 2, /* size (0 = byte, 1 = short, 2 = long) */
298 16, /* bitsize */
299 FALSE, /* pc_relative */
300 0, /* bitpos */
301 complain_overflow_signed, /* complain_on_overflow */
302 coff_mips_reloc, /* special_function */
303 "GPREL", /* name */
304 TRUE, /* partial_inplace */
305 0xffff, /* src_mask */
306 0xffff, /* dst_mask */
307 FALSE), /* pcrel_offset */
308
309 /* A reference to a literal using an offset from the gp register.
310 Handled by the function mips_gprel_reloc. */
311 HOWTO (MIPS_R_LITERAL, /* type */
312 0, /* rightshift */
313 2, /* size (0 = byte, 1 = short, 2 = long) */
314 16, /* bitsize */
315 FALSE, /* pc_relative */
316 0, /* bitpos */
317 complain_overflow_signed, /* complain_on_overflow */
318 coff_mips_reloc, /* special_function */
319 "LITERAL", /* name */
320 TRUE, /* partial_inplace */
321 0xffff, /* src_mask */
322 0xffff, /* dst_mask */
323 FALSE), /* pcrel_offset */
324
325 EMPTY_HOWTO (8),
326 EMPTY_HOWTO (9),
327 EMPTY_HOWTO (10),
328 EMPTY_HOWTO (11),
329 EMPTY_HOWTO (12),
330 EMPTY_HOWTO (13),
331 EMPTY_HOWTO (14),
332 EMPTY_HOWTO (15),
333 EMPTY_HOWTO (16),
334 EMPTY_HOWTO (17),
335 EMPTY_HOWTO (18),
336 EMPTY_HOWTO (19),
337 EMPTY_HOWTO (20),
338 EMPTY_HOWTO (21),
339 EMPTY_HOWTO (22),
340 EMPTY_HOWTO (23),
341 EMPTY_HOWTO (24),
342 EMPTY_HOWTO (25),
343 EMPTY_HOWTO (26),
344 EMPTY_HOWTO (27),
345 EMPTY_HOWTO (28),
346 EMPTY_HOWTO (29),
347 EMPTY_HOWTO (30),
348 EMPTY_HOWTO (31),
349 EMPTY_HOWTO (32),
350 EMPTY_HOWTO (33),
351 HOWTO (MIPS_R_RVA, /* type */
352 0, /* rightshift */
353 2, /* size (0 = byte, 1 = short, 2 = long) */
354 32, /* bitsize */
355 FALSE, /* pc_relative */
356 0, /* bitpos */
357 complain_overflow_bitfield, /* complain_on_overflow */
358 coff_mips_reloc, /* special_function */
359 "rva32", /* name */
360 TRUE, /* partial_inplace */
361 0xffffffff, /* src_mask */
362 0xffffffff, /* dst_mask */
363 FALSE), /* pcrel_offset */
364 EMPTY_HOWTO (35),
365 EMPTY_HOWTO (36),
366 HOWTO (MIPS_R_PAIR, /* type */
367 0, /* rightshift */
368 2, /* size (0 = byte, 1 = short, 2 = long) */
369 32, /* bitsize */
370 FALSE, /* pc_relative */
371 0, /* bitpos */
372 complain_overflow_bitfield, /* complain_on_overflow */
373 coff_mips_reloc, /* special_function */
374 "PAIR", /* name */
375 TRUE, /* partial_inplace */
376 0xffffffff, /* src_mask */
377 0xffffffff, /* dst_mask */
378 FALSE), /* pcrel_offset */
379 };
380
381 /* Turn a howto into a reloc nunmber */
382
383 #define SELECT_RELOC(x,howto) { x.r_type = howto->type; }
384 #define BADMAG(x) MIPSBADMAG(x)
385 #define MIPS 1 /* Customize coffcode.h */
386
387 #define RTYPE2HOWTO(cache_ptr, dst) \
388 (cache_ptr)->howto = howto_table + (dst)->r_type;
389
390 /* Compute the addend of a reloc. If the reloc is to a common symbol,
391 the object file contains the value of the common symbol. By the
392 time this is called, the linker may be using a different symbol
393 from a different object file with a different value. Therefore, we
394 hack wildly to locate the original symbol from this file so that we
395 can make the correct adjustment. This macro sets coffsym to the
396 symbol from the original file, and uses it to set the addend value
397 correctly. If this is not a common symbol, the usual addend
398 calculation is done, except that an additional tweak is needed for
399 PC relative relocs.
400 FIXME: This macro refers to symbols and asect; these are from the
401 calling function, not the macro arguments. */
402
403 #define CALC_ADDEND(abfd, ptr, reloc, cache_ptr) \
404 { \
405 coff_symbol_type *coffsym = (coff_symbol_type *) NULL; \
406 if (ptr && bfd_asymbol_bfd (ptr) != abfd) \
407 coffsym = (obj_symbols (abfd) \
408 + (cache_ptr->sym_ptr_ptr - symbols)); \
409 else if (ptr) \
410 coffsym = coff_symbol_from (abfd, ptr); \
411 if (coffsym != (coff_symbol_type *) NULL \
412 && coffsym->native->u.syment.n_scnum == 0) \
413 cache_ptr->addend = - coffsym->native->u.syment.n_value; \
414 else if (ptr && bfd_asymbol_bfd (ptr) == abfd \
415 && ptr->section != (asection *) NULL) \
416 cache_ptr->addend = - (ptr->section->vma + ptr->value); \
417 else \
418 cache_ptr->addend = 0; \
419 if (ptr && howto_table[reloc.r_type].pc_relative) \
420 cache_ptr->addend += asect->vma; \
421 }
422
423 /* Convert an rtype to howto for the COFF backend linker. */
424
425 static reloc_howto_type *
coff_mips_rtype_to_howto(abfd,sec,rel,h,sym,addendp)426 coff_mips_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
427 bfd *abfd ATTRIBUTE_UNUSED;
428 asection *sec;
429 struct internal_reloc *rel;
430 struct coff_link_hash_entry *h;
431 struct internal_syment *sym;
432 bfd_vma *addendp;
433 {
434
435 reloc_howto_type *howto;
436
437 howto = howto_table + rel->r_type;
438
439 #ifdef COFF_WITH_PE
440 *addendp = 0;
441 #endif
442
443 if (howto->pc_relative)
444 *addendp += sec->vma;
445
446 if (sym != NULL && sym->n_scnum == 0 && sym->n_value != 0)
447 {
448 /* This is a common symbol. The section contents include the
449 size (sym->n_value) as an addend. The relocate_section
450 function will be adding in the final value of the symbol. We
451 need to subtract out the current size in order to get the
452 correct result. */
453
454 BFD_ASSERT (h != NULL);
455
456 #ifndef COFF_WITH_PE
457 /* I think we *do* want to bypass this. If we don't, I have
458 seen some data parameters get the wrong relocation address.
459 If I link two versions with and without this section bypassed
460 and then do a binary comparison, the addresses which are
461 different can be looked up in the map. The case in which
462 this section has been bypassed has addresses which correspond
463 to values I can find in the map. */
464 *addendp -= sym->n_value;
465 #endif
466 }
467
468 #ifndef COFF_WITH_PE
469 /* If the output symbol is common (in which case this must be a
470 relocatable link), we need to add in the final size of the
471 common symbol. */
472 if (h != NULL && h->root.type == bfd_link_hash_common)
473 *addendp += h->root.u.c.size;
474 #endif
475
476 #ifdef COFF_WITH_PE
477 if (howto->pc_relative)
478 {
479 *addendp -= 4;
480
481 /* If the symbol is defined, then the generic code is going to
482 add back the symbol value in order to cancel out an
483 adjustment it made to the addend. However, we set the addend
484 to 0 at the start of this function. We need to adjust here,
485 to avoid the adjustment the generic code will make. FIXME:
486 This is getting a bit hackish. */
487 if (sym != NULL && sym->n_scnum != 0)
488 *addendp -= sym->n_value;
489 }
490
491 if (rel->r_type == MIPS_R_RVA)
492 {
493 *addendp -= pe_data(sec->output_section->owner)->pe_opthdr.ImageBase;
494 }
495 #endif
496
497 return howto;
498 }
499
500 #define coff_rtype_to_howto coff_mips_rtype_to_howto
501
502 #define coff_bfd_reloc_type_lookup coff_mips_reloc_type_lookup
503
504 /* Get the howto structure for a generic reloc type. */
505
506 static reloc_howto_type *
coff_mips_reloc_type_lookup(abfd,code)507 coff_mips_reloc_type_lookup (abfd, code)
508 bfd *abfd ATTRIBUTE_UNUSED;
509 bfd_reloc_code_real_type code;
510 {
511 int mips_type;
512
513 switch (code)
514 {
515 case BFD_RELOC_16:
516 mips_type = MIPS_R_REFHALF;
517 break;
518 case BFD_RELOC_32:
519 case BFD_RELOC_CTOR:
520 mips_type = MIPS_R_REFWORD;
521 break;
522 case BFD_RELOC_MIPS_JMP:
523 mips_type = MIPS_R_JMPADDR;
524 break;
525 case BFD_RELOC_HI16_S:
526 mips_type = MIPS_R_REFHI;
527 break;
528 case BFD_RELOC_LO16:
529 mips_type = MIPS_R_REFLO;
530 break;
531 case BFD_RELOC_GPREL16:
532 mips_type = MIPS_R_GPREL;
533 break;
534 case BFD_RELOC_MIPS_LITERAL:
535 mips_type = MIPS_R_LITERAL;
536 break;
537 /* FIXME?
538 case BFD_RELOC_16_PCREL_S2:
539 mips_type = MIPS_R_PCREL16;
540 break;
541 case BFD_RELOC_PCREL_HI16_S:
542 mips_type = MIPS_R_RELHI;
543 break;
544 case BFD_RELOC_PCREL_LO16:
545 mips_type = MIPS_R_RELLO;
546 break;
547 case BFD_RELOC_GPREL32:
548 mips_type = MIPS_R_SWITCH;
549 break;
550 */
551 case BFD_RELOC_RVA:
552 mips_type = MIPS_R_RVA;
553 break;
554 default:
555 return (reloc_howto_type *) NULL;
556 }
557
558 return &howto_table[mips_type];
559 }
560
561 static void
mips_swap_reloc_in(abfd,src,dst)562 mips_swap_reloc_in (abfd, src, dst)
563 bfd *abfd;
564 PTR src;
565 PTR dst;
566 {
567 static struct internal_reloc pair_prev;
568 RELOC *reloc_src = (RELOC *) src;
569 struct internal_reloc *reloc_dst = (struct internal_reloc *) dst;
570
571 reloc_dst->r_vaddr = H_GET_32 (abfd, reloc_src->r_vaddr);
572 reloc_dst->r_symndx = H_GET_S32 (abfd, reloc_src->r_symndx);
573 reloc_dst->r_type = H_GET_16 (abfd, reloc_src->r_type);
574 reloc_dst->r_size = 0;
575 reloc_dst->r_extern = 0;
576 reloc_dst->r_offset = 0;
577
578 switch (reloc_dst->r_type)
579 {
580 case MIPS_R_REFHI:
581 pair_prev = *reloc_dst;
582 break;
583 case MIPS_R_PAIR:
584 reloc_dst->r_offset = reloc_dst->r_symndx;
585 if (reloc_dst->r_offset & 0x8000)
586 reloc_dst->r_offset -= 0x10000;
587 /*printf ("dj: pair offset is %08x\n", reloc_dst->r_offset);*/
588 reloc_dst->r_symndx = pair_prev.r_symndx;
589 break;
590 }
591 }
592
593 static unsigned int
mips_swap_reloc_out(abfd,src,dst)594 mips_swap_reloc_out (abfd, src, dst)
595 bfd *abfd;
596 PTR src;
597 PTR dst;
598 {
599 static int prev_offset = 1;
600 static bfd_vma prev_addr = 0;
601 struct internal_reloc *reloc_src = (struct internal_reloc *)src;
602 struct external_reloc *reloc_dst = (struct external_reloc *)dst;
603
604 switch (reloc_src->r_type)
605 {
606 case MIPS_R_REFHI:
607 prev_addr = reloc_src->r_vaddr;
608 prev_offset = reloc_src->r_offset;
609 break;
610 case MIPS_R_REFLO:
611 if (reloc_src->r_vaddr == prev_addr)
612 {
613 /* FIXME: only slightly hackish. If we see a REFLO pointing to
614 the same address as a REFHI, we assume this is the matching
615 PAIR reloc and output it accordingly. The symndx is really
616 the low 16 bits of the addend */
617 H_PUT_32 (abfd, reloc_src->r_vaddr, reloc_dst->r_vaddr);
618 H_PUT_32 (abfd, reloc_src->r_symndx, reloc_dst->r_symndx);
619 H_PUT_16 (abfd, MIPS_R_PAIR, reloc_dst->r_type);
620 return RELSZ;
621 }
622 break;
623 }
624
625 H_PUT_32 (abfd, reloc_src->r_vaddr, reloc_dst->r_vaddr);
626 H_PUT_32 (abfd, reloc_src->r_symndx, reloc_dst->r_symndx);
627
628 H_PUT_16 (abfd, reloc_src->r_type, reloc_dst->r_type);
629 return RELSZ;
630 }
631
632 #define coff_swap_reloc_in mips_swap_reloc_in
633 #define coff_swap_reloc_out mips_swap_reloc_out
634 #define NO_COFF_RELOCS
635
636 static bfd_boolean
coff_pe_mips_relocate_section(output_bfd,info,input_bfd,input_section,contents,relocs,syms,sections)637 coff_pe_mips_relocate_section (output_bfd, info, input_bfd,
638 input_section, contents, relocs, syms,
639 sections)
640 bfd *output_bfd;
641 struct bfd_link_info *info;
642 bfd *input_bfd;
643 asection *input_section;
644 bfd_byte *contents;
645 struct internal_reloc *relocs;
646 struct internal_syment *syms;
647 asection **sections;
648 {
649 bfd_vma gp;
650 bfd_boolean gp_undefined;
651 size_t adjust;
652 struct internal_reloc *rel;
653 struct internal_reloc *rel_end;
654 unsigned int i;
655 bfd_boolean got_lo;
656
657 if (info->relocatable)
658 {
659 (*_bfd_error_handler) (_("\
660 %s: `ld -r' not supported with PE MIPS objects\n"),
661 bfd_archive_filename (input_bfd));
662 bfd_set_error (bfd_error_bad_value);
663 return FALSE;
664 }
665
666 BFD_ASSERT (input_bfd->xvec->byteorder
667 == output_bfd->xvec->byteorder);
668
669 #if 0
670 printf ("dj: relocate %s(%s) %08x\n",
671 input_bfd->filename, input_section->name,
672 input_section->output_section->vma + input_section->output_offset);
673 #endif
674
675 gp = _bfd_get_gp_value (output_bfd);
676 if (gp == 0)
677 gp_undefined = TRUE;
678 else
679 gp_undefined = FALSE;
680
681 got_lo = FALSE;
682
683 adjust = 0;
684
685 rel = relocs;
686 rel_end = rel + input_section->reloc_count;
687 for (i = 0; rel < rel_end; rel++, i++)
688 {
689 long symndx;
690 struct coff_link_hash_entry *h;
691 struct internal_syment *sym;
692 bfd_vma addend = 0;
693 bfd_vma val, tmp, targ, src, low;
694 reloc_howto_type *howto;
695 unsigned char *mem = contents + rel->r_vaddr;
696
697 symndx = rel->r_symndx;
698
699 if (symndx == -1)
700 {
701 h = NULL;
702 sym = NULL;
703 }
704 else
705 {
706 h = obj_coff_sym_hashes (input_bfd)[symndx];
707 sym = syms + symndx;
708 }
709
710 /* COFF treats common symbols in one of two ways. Either the
711 size of the symbol is included in the section contents, or it
712 is not. We assume that the size is not included, and force
713 the rtype_to_howto function to adjust the addend as needed. */
714
715 if (sym != NULL && sym->n_scnum != 0)
716 addend = - sym->n_value;
717 else
718 addend = 0;
719
720 howto = bfd_coff_rtype_to_howto (input_bfd, input_section, rel, h,
721 sym, &addend);
722 if (howto == NULL)
723 return FALSE;
724
725 /* If we are doing a relocatable link, then we can just ignore
726 a PC relative reloc that is pcrel_offset. It will already
727 have the correct value. If this is not a relocatable link,
728 then we should ignore the symbol value. */
729 if (howto->pc_relative && howto->pcrel_offset)
730 {
731 if (info->relocatable)
732 continue;
733 if (sym != NULL && sym->n_scnum != 0)
734 addend += sym->n_value;
735 }
736
737 val = 0;
738
739 if (h == NULL)
740 {
741 asection *sec;
742
743 if (symndx == -1)
744 {
745 sec = bfd_abs_section_ptr;
746 val = 0;
747 }
748 else
749 {
750 sec = sections[symndx];
751 val = (sec->output_section->vma
752 + sec->output_offset
753 + sym->n_value);
754 if (! obj_pe (input_bfd))
755 val -= sec->vma;
756 }
757 }
758 else
759 {
760 if (h->root.type == bfd_link_hash_defined
761 || h->root.type == bfd_link_hash_defweak)
762 {
763 asection *sec;
764
765 sec = h->root.u.def.section;
766 val = (h->root.u.def.value
767 + sec->output_section->vma
768 + sec->output_offset);
769 }
770
771 else if (! info->relocatable)
772 {
773 if (! ((*info->callbacks->undefined_symbol)
774 (info, h->root.root.string, input_bfd, input_section,
775 rel->r_vaddr - input_section->vma, TRUE)))
776 return FALSE;
777 }
778 }
779
780 src = rel->r_vaddr + input_section->output_section->vma
781 + input_section->output_offset;
782 #if 0
783 printf ("dj: reloc %02x %-8s a=%08x/%08x(%08x) v=%08x+%08x %s\n",
784 rel->r_type, howto_table[rel->r_type].name,
785 src, rel->r_vaddr, *(unsigned long *)mem, val, rel->r_offset,
786 h?h->root.root.string:"(none)");
787 #endif
788
789 /* OK, at this point the following variables are set up:
790 src = VMA of the memory we're fixing up
791 mem = pointer to memory we're fixing up
792 val = VMA of what we need to refer to
793 */
794
795 #define UI(x) (*_bfd_error_handler) (_("%s: unimplemented %s\n"), \
796 bfd_archive_filename (input_bfd), x); \
797 bfd_set_error (bfd_error_bad_value);
798
799 switch (rel->r_type)
800 {
801 case MIPS_R_ABSOLUTE:
802 /* ignore these */
803 break;
804
805 case MIPS_R_REFHALF:
806 UI("refhalf");
807 break;
808
809 case MIPS_R_REFWORD:
810 tmp = bfd_get_32(input_bfd, mem);
811 /* printf ("refword: src=%08x targ=%08x+%08x\n", src, tmp, val); */
812 tmp += val;
813 bfd_put_32(input_bfd, tmp, mem);
814 break;
815
816 case MIPS_R_JMPADDR:
817 tmp = bfd_get_32(input_bfd, mem);
818 targ = val + (tmp&0x03ffffff)*4;
819 if ((src & 0xf0000000) != (targ & 0xf0000000))
820 {
821 (*_bfd_error_handler) (_("%s: jump too far away\n"),
822 bfd_archive_filename (input_bfd));
823 bfd_set_error (bfd_error_bad_value);
824 return FALSE;
825 }
826 tmp &= 0xfc000000;
827 tmp |= (targ/4) & 0x3ffffff;
828 bfd_put_32(input_bfd, tmp, mem);
829 break;
830
831 case MIPS_R_REFHI:
832 tmp = bfd_get_32(input_bfd, mem);
833 switch (rel[1].r_type)
834 {
835 case MIPS_R_PAIR:
836 /* MS PE object */
837 targ = val + rel[1].r_offset + ((tmp & 0xffff) << 16);
838 break;
839 case MIPS_R_REFLO:
840 /* GNU COFF object */
841 low = bfd_get_32(input_bfd, contents + rel[1].r_vaddr);
842 low &= 0xffff;
843 if (low & 0x8000)
844 low -= 0x10000;
845 targ = val + low + ((tmp & 0xffff) << 16);
846 break;
847 default:
848 (*_bfd_error_handler) (_("%s: bad pair/reflo after refhi\n"),
849 bfd_archive_filename (input_bfd));
850 bfd_set_error (bfd_error_bad_value);
851 return FALSE;
852 }
853 tmp &= 0xffff0000;
854 tmp |= (targ >> 16) & 0xffff;
855 bfd_put_32(input_bfd, tmp, mem);
856 break;
857
858 case MIPS_R_REFLO:
859 tmp = bfd_get_32(input_bfd, mem);
860 targ = val + (tmp & 0xffff);
861 /* printf ("refword: src=%08x targ=%08x\n", src, targ); */
862 tmp &= 0xffff0000;
863 tmp |= targ & 0xffff;
864 bfd_put_32(input_bfd, tmp, mem);
865 break;
866
867 case MIPS_R_GPREL:
868 case MIPS_R_LITERAL:
869 UI("gprel");
870 break;
871
872 case MIPS_R_SECTION:
873 UI("section");
874 break;
875
876 case MIPS_R_SECREL:
877 UI("secrel");
878 break;
879
880 case MIPS_R_SECRELLO:
881 UI("secrello");
882 break;
883
884 case MIPS_R_SECRELHI:
885 UI("secrelhi");
886 break;
887
888 case MIPS_R_RVA:
889 tmp = bfd_get_32 (input_bfd, mem);
890 /* printf ("rva: src=%08x targ=%08x+%08x\n", src, tmp, val); */
891 tmp += val
892 - pe_data (input_section->output_section->owner)->pe_opthdr.ImageBase;
893 bfd_put_32 (input_bfd, tmp, mem);
894 break;
895
896 case MIPS_R_PAIR:
897 /* ignore these */
898 break;
899 }
900 }
901
902 return TRUE;
903 }
904
905 #define coff_relocate_section coff_pe_mips_relocate_section
906
907 #ifdef TARGET_UNDERSCORE
908
909 /* If mips gcc uses underscores for symbol names, then it does not use
910 a leading dot for local labels, so if TARGET_UNDERSCORE is defined
911 we treat all symbols starting with L as local. */
912
913 static bfd_boolean coff_mips_is_local_label_name
914 PARAMS ((bfd *, const char *));
915
916 static bfd_boolean
coff_mips_is_local_label_name(abfd,name)917 coff_mips_is_local_label_name (abfd, name)
918 bfd *abfd;
919 const char *name;
920 {
921 if (name[0] == 'L')
922 return TRUE;
923
924 return _bfd_coff_is_local_label_name (abfd, name);
925 }
926
927 #define coff_bfd_is_local_label_name coff_mips_is_local_label_name
928
929 #endif /* TARGET_UNDERSCORE */
930
931 #define COFF_NO_HACK_SCNHDR_SIZE
932
933 #include "coffcode.h"
934
935 const bfd_target
936 #ifdef TARGET_SYM
937 TARGET_SYM =
938 #else
939 mipslpe_vec =
940 #endif
941 {
942 #ifdef TARGET_NAME
943 TARGET_NAME,
944 #else
945 "pe-mips", /* name */
946 #endif
947 bfd_target_coff_flavour,
948 BFD_ENDIAN_LITTLE, /* data byte order is little */
949 BFD_ENDIAN_LITTLE, /* header byte order is little */
950
951 (HAS_RELOC | EXEC_P | /* object flags */
952 HAS_LINENO | HAS_DEBUG |
953 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
954
955 #ifndef COFF_WITH_PE
956 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC /* section flags */
957 | SEC_CODE | SEC_DATA),
958 #else
959 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC /* section flags */
960 | SEC_CODE | SEC_DATA
961 | SEC_LINK_ONCE | SEC_LINK_DUPLICATES),
962 #endif
963
964 #ifdef TARGET_UNDERSCORE
965 TARGET_UNDERSCORE, /* leading underscore */
966 #else
967 0, /* leading underscore */
968 #endif
969 '/', /* ar_pad_char */
970 15, /* ar_max_namelen */
971
972 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
973 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
974 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
975 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
976 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
977 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
978
979 /* Note that we allow an object file to be treated as a core file as well. */
980 {_bfd_dummy_target, coff_object_p, /* bfd_check_format */
981 bfd_generic_archive_p, coff_object_p},
982 {bfd_false, coff_mkobject, _bfd_generic_mkarchive, /* bfd_set_format */
983 bfd_false},
984 {bfd_false, coff_write_object_contents, /* bfd_write_contents */
985 _bfd_write_archive_contents, bfd_false},
986
987 BFD_JUMP_TABLE_GENERIC (coff),
988 BFD_JUMP_TABLE_COPY (coff),
989 BFD_JUMP_TABLE_CORE (_bfd_nocore),
990 BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
991 BFD_JUMP_TABLE_SYMBOLS (coff),
992 BFD_JUMP_TABLE_RELOCS (coff),
993 BFD_JUMP_TABLE_WRITE (coff),
994 BFD_JUMP_TABLE_LINK (coff),
995 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
996
997 NULL,
998
999 COFF_SWAP_TABLE
1000 };
1001