2006-12-13 Paul Brook <paul@codesourcery.com>
[binutils-gdb.git] / gas / write.c
1 /* write.c - emit .o file
2 Copyright 1986, 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
3 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
4 Free Software Foundation, Inc.
5
6 This file is part of GAS, the GNU Assembler.
7
8 GAS 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, or (at your option)
11 any later version.
12
13 GAS 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 GAS; see the file COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
21 02110-1301, USA. */
22
23 /* This thing should be set up to do byteordering correctly. But... */
24
25 #include "as.h"
26 #include "subsegs.h"
27 #include "obstack.h"
28 #include "output-file.h"
29 #include "dwarf2dbg.h"
30
31 #ifndef TC_ADJUST_RELOC_COUNT
32 #define TC_ADJUST_RELOC_COUNT(FIX, COUNT)
33 #endif
34
35 #ifndef TC_FORCE_RELOCATION
36 #define TC_FORCE_RELOCATION(FIX) \
37 (generic_force_reloc (FIX))
38 #endif
39
40 #ifndef TC_FORCE_RELOCATION_ABS
41 #define TC_FORCE_RELOCATION_ABS(FIX) \
42 (TC_FORCE_RELOCATION (FIX))
43 #endif
44
45 #ifndef TC_FORCE_RELOCATION_LOCAL
46 #define TC_FORCE_RELOCATION_LOCAL(FIX) \
47 (!(FIX)->fx_pcrel \
48 || (FIX)->fx_plt \
49 || TC_FORCE_RELOCATION (FIX))
50 #endif
51
52 #ifndef TC_FORCE_RELOCATION_SUB_SAME
53 #define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEG) \
54 (! SEG_NORMAL (SEG))
55 #endif
56
57 #ifndef TC_FORCE_RELOCATION_SUB_ABS
58 #define TC_FORCE_RELOCATION_SUB_ABS(FIX) 0
59 #endif
60
61 #ifndef TC_FORCE_RELOCATION_SUB_LOCAL
62 #ifdef DIFF_EXPR_OK
63 #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX) 0
64 #else
65 #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX) 1
66 #endif
67 #endif
68
69 #ifndef TC_VALIDATE_FIX_SUB
70 #ifdef UNDEFINED_DIFFERENCE_OK
71 /* The PA needs this for PIC code generation. */
72 #define TC_VALIDATE_FIX_SUB(FIX) 1
73 #else
74 #define TC_VALIDATE_FIX_SUB(FIX) \
75 ((FIX)->fx_r_type == BFD_RELOC_GPREL32 \
76 || (FIX)->fx_r_type == BFD_RELOC_GPREL16)
77 #endif
78 #endif
79
80 #ifndef TC_LINKRELAX_FIXUP
81 #define TC_LINKRELAX_FIXUP(SEG) 1
82 #endif
83
84 #ifndef MD_APPLY_SYM_VALUE
85 #define MD_APPLY_SYM_VALUE(FIX) 1
86 #endif
87
88 #ifndef TC_FINALIZE_SYMS_BEFORE_SIZE_SEG
89 #define TC_FINALIZE_SYMS_BEFORE_SIZE_SEG 1
90 #endif
91
92 #ifndef MD_PCREL_FROM_SECTION
93 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from (FIX)
94 #endif
95
96 #ifndef TC_FAKE_LABEL
97 #define TC_FAKE_LABEL(NAME) (strcmp ((NAME), FAKE_LABEL_NAME) == 0)
98 #endif
99
100 /* Used to control final evaluation of expressions. */
101 int finalize_syms = 0;
102
103 int symbol_table_frozen;
104
105 symbolS *abs_section_sym;
106
107 /* Remember the value of dot when parsing expressions. */
108 addressT dot_value;
109
110 void print_fixup (fixS *);
111
112 static void renumber_sections (bfd *, asection *, PTR);
113
114 /* We generally attach relocs to frag chains. However, after we have
115 chained these all together into a segment, any relocs we add after
116 that must be attached to a segment. This will include relocs added
117 in md_estimate_size_for_relax, for example. */
118 static int frags_chained = 0;
119
120 static int n_fixups;
121
122 #define RELOC_ENUM enum bfd_reloc_code_real
123
124 static fixS *fix_new_internal (fragS *, int where, int size,
125 symbolS *add, symbolS *sub,
126 offsetT offset, int pcrel,
127 RELOC_ENUM r_type);
128 static long fixup_segment (fixS *, segT);
129 static relax_addressT relax_align (relax_addressT addr, int align);
130 static fragS *chain_frchains_together_1 (segT, struct frchain *);
131 static void chain_frchains_together (bfd *, segT, PTR);
132 static void cvt_frag_to_fill (segT, fragS *);
133 static void adjust_reloc_syms (bfd *, asection *, PTR);
134 static void fix_segment (bfd *, asection *, PTR);
135 static void write_relocs (bfd *, asection *, PTR);
136 static void write_contents (bfd *, asection *, PTR);
137 static void set_symtab (void);
138 static void merge_data_into_text (void);
139
140 /* Create a fixS in obstack 'notes'. */
141
142 static fixS *
143 fix_new_internal (fragS *frag, /* Which frag? */
144 int where, /* Where in that frag? */
145 int size, /* 1, 2, or 4 usually. */
146 symbolS *add_symbol, /* X_add_symbol. */
147 symbolS *sub_symbol, /* X_op_symbol. */
148 offsetT offset, /* X_add_number. */
149 int pcrel, /* TRUE if PC-relative relocation. */
150 RELOC_ENUM r_type ATTRIBUTE_UNUSED /* Relocation type. */)
151 {
152 fixS *fixP;
153
154 n_fixups++;
155
156 fixP = (fixS *) obstack_alloc (&notes, sizeof (fixS));
157
158 fixP->fx_frag = frag;
159 fixP->fx_where = where;
160 fixP->fx_size = size;
161 /* We've made fx_size a narrow field; check that it's wide enough. */
162 if (fixP->fx_size != size)
163 {
164 as_bad (_("field fx_size too small to hold %d"), size);
165 abort ();
166 }
167 fixP->fx_addsy = add_symbol;
168 fixP->fx_subsy = sub_symbol;
169 fixP->fx_offset = offset;
170 fixP->fx_dot_value = dot_value;
171 fixP->fx_pcrel = pcrel;
172 fixP->fx_plt = 0;
173 fixP->fx_r_type = r_type;
174 fixP->fx_im_disp = 0;
175 fixP->fx_pcrel_adjust = 0;
176 fixP->fx_bit_fixP = 0;
177 fixP->fx_addnumber = 0;
178 fixP->fx_tcbit = 0;
179 fixP->fx_done = 0;
180 fixP->fx_no_overflow = 0;
181 fixP->fx_signed = 0;
182
183 #ifdef USING_CGEN
184 fixP->fx_cgen.insn = NULL;
185 fixP->fx_cgen.opinfo = 0;
186 #endif
187
188 #ifdef TC_FIX_TYPE
189 TC_INIT_FIX_DATA (fixP);
190 #endif
191
192 as_where (&fixP->fx_file, &fixP->fx_line);
193
194 /* Usually, we want relocs sorted numerically, but while
195 comparing to older versions of gas that have relocs
196 reverse sorted, it is convenient to have this compile
197 time option. xoxorich. */
198 {
199
200 fixS **seg_fix_rootP = (frags_chained
201 ? &seg_info (now_seg)->fix_root
202 : &frchain_now->fix_root);
203 fixS **seg_fix_tailP = (frags_chained
204 ? &seg_info (now_seg)->fix_tail
205 : &frchain_now->fix_tail);
206
207 #ifdef REVERSE_SORT_RELOCS
208
209 fixP->fx_next = *seg_fix_rootP;
210 *seg_fix_rootP = fixP;
211
212 #else /* REVERSE_SORT_RELOCS */
213
214 fixP->fx_next = NULL;
215
216 if (*seg_fix_tailP)
217 (*seg_fix_tailP)->fx_next = fixP;
218 else
219 *seg_fix_rootP = fixP;
220 *seg_fix_tailP = fixP;
221
222 #endif /* REVERSE_SORT_RELOCS */
223 }
224
225 return fixP;
226 }
227
228 /* Create a fixup relative to a symbol (plus a constant). */
229
230 fixS *
231 fix_new (fragS *frag, /* Which frag? */
232 int where, /* Where in that frag? */
233 int size, /* 1, 2, or 4 usually. */
234 symbolS *add_symbol, /* X_add_symbol. */
235 offsetT offset, /* X_add_number. */
236 int pcrel, /* TRUE if PC-relative relocation. */
237 RELOC_ENUM r_type /* Relocation type. */)
238 {
239 return fix_new_internal (frag, where, size, add_symbol,
240 (symbolS *) NULL, offset, pcrel, r_type);
241 }
242
243 /* Create a fixup for an expression. Currently we only support fixups
244 for difference expressions. That is itself more than most object
245 file formats support anyhow. */
246
247 fixS *
248 fix_new_exp (fragS *frag, /* Which frag? */
249 int where, /* Where in that frag? */
250 int size, /* 1, 2, or 4 usually. */
251 expressionS *exp, /* Expression. */
252 int pcrel, /* TRUE if PC-relative relocation. */
253 RELOC_ENUM r_type /* Relocation type. */)
254 {
255 symbolS *add = NULL;
256 symbolS *sub = NULL;
257 offsetT off = 0;
258
259 switch (exp->X_op)
260 {
261 case O_absent:
262 break;
263
264 case O_register:
265 as_bad (_("register value used as expression"));
266 break;
267
268 case O_add:
269 /* This comes up when _GLOBAL_OFFSET_TABLE_+(.-L0) is read, if
270 the difference expression cannot immediately be reduced. */
271 {
272 symbolS *stmp = make_expr_symbol (exp);
273
274 exp->X_op = O_symbol;
275 exp->X_op_symbol = 0;
276 exp->X_add_symbol = stmp;
277 exp->X_add_number = 0;
278
279 return fix_new_exp (frag, where, size, exp, pcrel, r_type);
280 }
281
282 case O_symbol_rva:
283 add = exp->X_add_symbol;
284 off = exp->X_add_number;
285 r_type = BFD_RELOC_RVA;
286 break;
287
288 case O_uminus:
289 sub = exp->X_add_symbol;
290 off = exp->X_add_number;
291 break;
292
293 case O_subtract:
294 sub = exp->X_op_symbol;
295 /* Fall through. */
296 case O_symbol:
297 add = exp->X_add_symbol;
298 /* Fall through. */
299 case O_constant:
300 off = exp->X_add_number;
301 break;
302
303 default:
304 add = make_expr_symbol (exp);
305 break;
306 }
307
308 return fix_new_internal (frag, where, size, add, sub, off, pcrel, r_type);
309 }
310
311 /* Generic function to determine whether a fixup requires a relocation. */
312 int
313 generic_force_reloc (fixS *fix)
314 {
315 if (fix->fx_r_type == BFD_RELOC_VTABLE_INHERIT
316 || fix->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
317 return 1;
318
319 if (fix->fx_addsy == NULL)
320 return 0;
321
322 return S_FORCE_RELOC (fix->fx_addsy, fix->fx_subsy == NULL);
323 }
324
325 /* Append a string onto another string, bumping the pointer along. */
326 void
327 append (char **charPP, char *fromP, unsigned long length)
328 {
329 /* Don't trust memcpy() of 0 chars. */
330 if (length == 0)
331 return;
332
333 memcpy (*charPP, fromP, length);
334 *charPP += length;
335 }
336
337 /* This routine records the largest alignment seen for each segment.
338 If the beginning of the segment is aligned on the worst-case
339 boundary, all of the other alignments within it will work. At
340 least one object format really uses this info. */
341
342 void
343 record_alignment (/* Segment to which alignment pertains. */
344 segT seg,
345 /* Alignment, as a power of 2 (e.g., 1 => 2-byte
346 boundary, 2 => 4-byte boundary, etc.) */
347 int align)
348 {
349 if (seg == absolute_section)
350 return;
351
352 if ((unsigned int) align > bfd_get_section_alignment (stdoutput, seg))
353 bfd_set_section_alignment (stdoutput, seg, align);
354 }
355
356 int
357 get_recorded_alignment (segT seg)
358 {
359 if (seg == absolute_section)
360 return 0;
361
362 return bfd_get_section_alignment (stdoutput, seg);
363 }
364
365 /* Reset the section indices after removing the gas created sections. */
366
367 static void
368 renumber_sections (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, PTR countparg)
369 {
370 int *countp = (int *) countparg;
371
372 sec->index = *countp;
373 ++*countp;
374 }
375
376 static fragS *
377 chain_frchains_together_1 (segT section, struct frchain *frchp)
378 {
379 fragS dummy, *prev_frag = &dummy;
380 fixS fix_dummy, *prev_fix = &fix_dummy;
381
382 for (; frchp; frchp = frchp->frch_next)
383 {
384 prev_frag->fr_next = frchp->frch_root;
385 prev_frag = frchp->frch_last;
386 assert (prev_frag->fr_type != 0);
387 if (frchp->fix_root != (fixS *) NULL)
388 {
389 if (seg_info (section)->fix_root == (fixS *) NULL)
390 seg_info (section)->fix_root = frchp->fix_root;
391 prev_fix->fx_next = frchp->fix_root;
392 seg_info (section)->fix_tail = frchp->fix_tail;
393 prev_fix = frchp->fix_tail;
394 }
395 }
396 assert (prev_frag->fr_type != 0);
397 assert (prev_frag != &dummy);
398 prev_frag->fr_next = 0;
399 return prev_frag;
400 }
401
402 static void
403 chain_frchains_together (bfd *abfd ATTRIBUTE_UNUSED,
404 segT section,
405 PTR xxx ATTRIBUTE_UNUSED)
406 {
407 segment_info_type *info;
408
409 /* BFD may have introduced its own sections without using
410 subseg_new, so it is possible that seg_info is NULL. */
411 info = seg_info (section);
412 if (info != (segment_info_type *) NULL)
413 info->frchainP->frch_last
414 = chain_frchains_together_1 (section, info->frchainP);
415
416 /* Now that we've chained the frags together, we must add new fixups
417 to the segment, not to the frag chain. */
418 frags_chained = 1;
419 }
420
421 static void
422 cvt_frag_to_fill (segT sec ATTRIBUTE_UNUSED, fragS *fragP)
423 {
424 switch (fragP->fr_type)
425 {
426 case rs_align:
427 case rs_align_code:
428 case rs_align_test:
429 case rs_org:
430 case rs_space:
431 #ifdef HANDLE_ALIGN
432 HANDLE_ALIGN (fragP);
433 #endif
434 know (fragP->fr_next != NULL);
435 fragP->fr_offset = (fragP->fr_next->fr_address
436 - fragP->fr_address
437 - fragP->fr_fix) / fragP->fr_var;
438 if (fragP->fr_offset < 0)
439 {
440 as_bad_where (fragP->fr_file, fragP->fr_line,
441 _("attempt to .org/.space backwards? (%ld)"),
442 (long) fragP->fr_offset);
443 fragP->fr_offset = 0;
444 }
445 fragP->fr_type = rs_fill;
446 break;
447
448 case rs_fill:
449 break;
450
451 case rs_leb128:
452 {
453 valueT value = S_GET_VALUE (fragP->fr_symbol);
454 int size;
455
456 size = output_leb128 (fragP->fr_literal + fragP->fr_fix, value,
457 fragP->fr_subtype);
458
459 fragP->fr_fix += size;
460 fragP->fr_type = rs_fill;
461 fragP->fr_var = 0;
462 fragP->fr_offset = 0;
463 fragP->fr_symbol = NULL;
464 }
465 break;
466
467 case rs_cfa:
468 eh_frame_convert_frag (fragP);
469 break;
470
471 case rs_dwarf2dbg:
472 dwarf2dbg_convert_frag (fragP);
473 break;
474
475 case rs_machine_dependent:
476 md_convert_frag (stdoutput, sec, fragP);
477
478 assert (fragP->fr_next == NULL
479 || ((offsetT) (fragP->fr_next->fr_address - fragP->fr_address)
480 == fragP->fr_fix));
481
482 /* After md_convert_frag, we make the frag into a ".space 0".
483 md_convert_frag() should set up any fixSs and constants
484 required. */
485 frag_wane (fragP);
486 break;
487
488 #ifndef WORKING_DOT_WORD
489 case rs_broken_word:
490 {
491 struct broken_word *lie;
492
493 if (fragP->fr_subtype)
494 {
495 fragP->fr_fix += md_short_jump_size;
496 for (lie = (struct broken_word *) (fragP->fr_symbol);
497 lie && lie->dispfrag == fragP;
498 lie = lie->next_broken_word)
499 if (lie->added == 1)
500 fragP->fr_fix += md_long_jump_size;
501 }
502 frag_wane (fragP);
503 }
504 break;
505 #endif
506
507 default:
508 BAD_CASE (fragP->fr_type);
509 break;
510 }
511 #ifdef md_frag_check
512 md_frag_check (fragP);
513 #endif
514 }
515
516 struct relax_seg_info
517 {
518 int pass;
519 int changed;
520 };
521
522 static void
523 relax_seg (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *xxx)
524 {
525 segment_info_type *seginfo = seg_info (sec);
526 struct relax_seg_info *info = (struct relax_seg_info *) xxx;
527
528 if (seginfo && seginfo->frchainP
529 && relax_segment (seginfo->frchainP->frch_root, sec, info->pass))
530 info->changed = 1;
531 }
532
533 static void size_seg (bfd *, asection *, PTR);
534
535 static void
536 size_seg (bfd *abfd, asection *sec, PTR xxx ATTRIBUTE_UNUSED)
537 {
538 flagword flags;
539 fragS *fragp;
540 segment_info_type *seginfo;
541 int x;
542 valueT size, newsize;
543
544 subseg_change (sec, 0);
545
546 seginfo = seg_info (sec);
547 if (seginfo && seginfo->frchainP)
548 {
549 for (fragp = seginfo->frchainP->frch_root; fragp; fragp = fragp->fr_next)
550 cvt_frag_to_fill (sec, fragp);
551 for (fragp = seginfo->frchainP->frch_root;
552 fragp->fr_next;
553 fragp = fragp->fr_next)
554 /* Walk to last elt. */
555 ;
556 size = fragp->fr_address + fragp->fr_fix;
557 }
558 else
559 size = 0;
560
561 flags = bfd_get_section_flags (abfd, sec);
562
563 if (size > 0 && ! seginfo->bss)
564 flags |= SEC_HAS_CONTENTS;
565
566 /* @@ This is just an approximation. */
567 if (seginfo && seginfo->fix_root)
568 flags |= SEC_RELOC;
569 else
570 flags &= ~SEC_RELOC;
571 x = bfd_set_section_flags (abfd, sec, flags);
572 assert (x);
573
574 newsize = md_section_align (sec, size);
575 x = bfd_set_section_size (abfd, sec, newsize);
576 assert (x);
577
578 /* If the size had to be rounded up, add some padding in the last
579 non-empty frag. */
580 assert (newsize >= size);
581 if (size != newsize)
582 {
583 fragS *last = seginfo->frchainP->frch_last;
584 fragp = seginfo->frchainP->frch_root;
585 while (fragp->fr_next != last)
586 fragp = fragp->fr_next;
587 last->fr_address = size;
588 if ((newsize - size) % fragp->fr_var == 0)
589 fragp->fr_offset += (newsize - size) / fragp->fr_var;
590 else
591 /* If we hit this abort, it's likely due to subsegs_finish not
592 providing sufficient alignment on the last frag, and the
593 machine dependent code using alignment frags with fr_var
594 greater than 1. */
595 abort ();
596 }
597
598 #ifdef tc_frob_section
599 tc_frob_section (sec);
600 #endif
601 #ifdef obj_frob_section
602 obj_frob_section (sec);
603 #endif
604 }
605
606 #ifdef DEBUG2
607 static void
608 dump_section_relocs (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, FILE *stream)
609 {
610 segment_info_type *seginfo = seg_info (sec);
611 fixS *fixp = seginfo->fix_root;
612
613 if (!fixp)
614 return;
615
616 fprintf (stream, "sec %s relocs:\n", sec->name);
617 while (fixp)
618 {
619 symbolS *s = fixp->fx_addsy;
620
621 fprintf (stream, " %08lx: type %d ", (unsigned long) fixp,
622 (int) fixp->fx_r_type);
623 if (s == NULL)
624 fprintf (stream, "no sym\n");
625 else
626 {
627 print_symbol_value_1 (stream, s);
628 fprintf (stream, "\n");
629 }
630 fixp = fixp->fx_next;
631 }
632 }
633 #else
634 #define dump_section_relocs(ABFD,SEC,STREAM) ((void) 0)
635 #endif
636
637 #ifndef EMIT_SECTION_SYMBOLS
638 #define EMIT_SECTION_SYMBOLS 1
639 #endif
640
641 /* This pass over fixups decides whether symbols can be replaced with
642 section symbols. */
643
644 static void
645 adjust_reloc_syms (bfd *abfd ATTRIBUTE_UNUSED,
646 asection *sec,
647 PTR xxx ATTRIBUTE_UNUSED)
648 {
649 segment_info_type *seginfo = seg_info (sec);
650 fixS *fixp;
651
652 if (seginfo == NULL)
653 return;
654
655 dump_section_relocs (abfd, sec, stderr);
656
657 for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next)
658 if (fixp->fx_done)
659 /* Ignore it. */
660 ;
661 else if (fixp->fx_addsy)
662 {
663 symbolS *sym;
664 asection *symsec;
665
666 #ifdef DEBUG5
667 fprintf (stderr, "\n\nadjusting fixup:\n");
668 print_fixup (fixp);
669 #endif
670
671 sym = fixp->fx_addsy;
672
673 /* All symbols should have already been resolved at this
674 point. It is possible to see unresolved expression
675 symbols, though, since they are not in the regular symbol
676 table. */
677 resolve_symbol_value (sym);
678
679 if (fixp->fx_subsy != NULL)
680 resolve_symbol_value (fixp->fx_subsy);
681
682 /* If this symbol is equated to an undefined or common symbol,
683 convert the fixup to being against that symbol. */
684 if (symbol_equated_reloc_p (sym)
685 || S_IS_WEAKREFR (sym))
686 {
687 fixp->fx_offset += symbol_get_value_expression (sym)->X_add_number;
688 sym = symbol_get_value_expression (sym)->X_add_symbol;
689 fixp->fx_addsy = sym;
690 }
691
692 if (symbol_mri_common_p (sym))
693 {
694 /* These symbols are handled specially in fixup_segment. */
695 continue;
696 }
697
698 /* If the symbol is undefined, common, weak, or global (ELF
699 shared libs), we can't replace it with the section symbol. */
700 if (S_FORCE_RELOC (fixp->fx_addsy, 1))
701 continue;
702
703 /* Is there some other (target cpu dependent) reason we can't adjust
704 this one? (E.g. relocations involving function addresses on
705 the PA. */
706 #ifdef tc_fix_adjustable
707 if (! tc_fix_adjustable (fixp))
708 continue;
709 #endif
710
711 /* Since we're reducing to section symbols, don't attempt to reduce
712 anything that's already using one. */
713 if (symbol_section_p (sym))
714 continue;
715
716 symsec = S_GET_SEGMENT (sym);
717 if (symsec == NULL)
718 abort ();
719
720 if (bfd_is_abs_section (symsec))
721 {
722 /* The fixup_segment routine normally will not use this
723 symbol in a relocation. */
724 continue;
725 }
726
727 /* Don't try to reduce relocs which refer to non-local symbols
728 in .linkonce sections. It can lead to confusion when a
729 debugging section refers to a .linkonce section. I hope
730 this will always be correct. */
731 if (symsec != sec && ! S_IS_LOCAL (sym))
732 {
733 if ((symsec->flags & SEC_LINK_ONCE) != 0
734 || (IS_ELF
735 /* The GNU toolchain uses an extension for ELF: a
736 section beginning with the magic string
737 .gnu.linkonce is a linkonce section. */
738 && strncmp (segment_name (symsec), ".gnu.linkonce",
739 sizeof ".gnu.linkonce" - 1) == 0))
740 continue;
741 }
742
743 /* Never adjust a reloc against local symbol in a merge section
744 with non-zero addend. */
745 if ((symsec->flags & SEC_MERGE) != 0
746 && (fixp->fx_offset != 0 || fixp->fx_subsy != NULL))
747 continue;
748
749 /* Never adjust a reloc against TLS local symbol. */
750 if ((symsec->flags & SEC_THREAD_LOCAL) != 0)
751 continue;
752
753 /* We refetch the segment when calling section_symbol, rather
754 than using symsec, because S_GET_VALUE may wind up changing
755 the section when it calls resolve_symbol_value. */
756 fixp->fx_offset += S_GET_VALUE (sym);
757 fixp->fx_addsy = section_symbol (S_GET_SEGMENT (sym));
758 #ifdef DEBUG5
759 fprintf (stderr, "\nadjusted fixup:\n");
760 print_fixup (fixp);
761 #endif
762 }
763
764 dump_section_relocs (abfd, sec, stderr);
765 }
766
767 static void
768 fix_segment (bfd *abfd ATTRIBUTE_UNUSED,
769 asection *sec,
770 PTR xxx ATTRIBUTE_UNUSED)
771 {
772 segment_info_type *seginfo = seg_info (sec);
773
774 fixup_segment (seginfo->fix_root, sec);
775 }
776
777 static void
778 write_relocs (bfd *abfd, asection *sec, PTR xxx ATTRIBUTE_UNUSED)
779 {
780 segment_info_type *seginfo = seg_info (sec);
781 unsigned int i;
782 unsigned int n;
783 arelent **relocs;
784 fixS *fixp;
785 char *err;
786
787 /* If seginfo is NULL, we did not create this section; don't do
788 anything with it. */
789 if (seginfo == NULL)
790 return;
791
792 n = 0;
793 for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next)
794 n++;
795
796 #ifndef RELOC_EXPANSION_POSSIBLE
797 /* Set up reloc information as well. */
798 relocs = (arelent **) xcalloc (n, sizeof (arelent *));
799
800 i = 0;
801 for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next)
802 {
803 arelent *reloc;
804 bfd_reloc_status_type s;
805 symbolS *sym;
806
807 if (fixp->fx_done)
808 {
809 n--;
810 continue;
811 }
812
813 /* If this is an undefined symbol which was equated to another
814 symbol, then generate the reloc against the latter symbol
815 rather than the former. */
816 sym = fixp->fx_addsy;
817 while (symbol_equated_reloc_p (sym))
818 {
819 symbolS *n;
820
821 /* We must avoid looping, as that can occur with a badly
822 written program. */
823 n = symbol_get_value_expression (sym)->X_add_symbol;
824 if (n == sym)
825 break;
826 fixp->fx_offset += symbol_get_value_expression (sym)->X_add_number;
827 sym = n;
828 }
829 fixp->fx_addsy = sym;
830
831 reloc = tc_gen_reloc (sec, fixp);
832 if (!reloc)
833 {
834 n--;
835 continue;
836 }
837
838 /*
839 This test is triggered inappropriately for the SH:
840 if (fixp->fx_where + fixp->fx_size
841 > fixp->fx_frag->fr_fix + fixp->fx_frag->fr_offset)
842 abort ();
843 */
844
845 s = bfd_install_relocation (stdoutput, reloc,
846 fixp->fx_frag->fr_literal,
847 fixp->fx_frag->fr_address,
848 sec, &err);
849 switch (s)
850 {
851 case bfd_reloc_ok:
852 break;
853 case bfd_reloc_overflow:
854 as_bad_where (fixp->fx_file, fixp->fx_line,
855 _("relocation overflow"));
856 break;
857 case bfd_reloc_outofrange:
858 as_bad_where (fixp->fx_file, fixp->fx_line,
859 _("relocation out of range"));
860 break;
861 default:
862 as_fatal (_("%s:%u: bad return from bfd_install_relocation: %x"),
863 fixp->fx_file, fixp->fx_line, s);
864 }
865 relocs[i++] = reloc;
866 }
867 #else
868 n = n * MAX_RELOC_EXPANSION;
869 /* Set up reloc information as well. */
870 relocs = (arelent **) xcalloc (n, sizeof (arelent *));
871
872 i = 0;
873 for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next)
874 {
875 arelent **reloc;
876 bfd_reloc_status_type s;
877 symbolS *sym;
878 int j;
879
880 if (fixp->fx_done)
881 {
882 n--;
883 continue;
884 }
885
886 /* If this is an undefined symbol which was equated to another
887 symbol, then generate the reloc against the latter symbol
888 rather than the former. */
889 sym = fixp->fx_addsy;
890 while (symbol_equated_reloc_p (sym))
891 {
892 symbolS *n;
893
894 /* We must avoid looping, as that can occur with a badly
895 written program. */
896 n = symbol_get_value_expression (sym)->X_add_symbol;
897 if (n == sym)
898 break;
899 fixp->fx_offset += symbol_get_value_expression (sym)->X_add_number;
900 sym = n;
901 }
902 fixp->fx_addsy = sym;
903
904 reloc = tc_gen_reloc (sec, fixp);
905
906 for (j = 0; reloc[j]; j++)
907 {
908 relocs[i++] = reloc[j];
909 assert (i <= n);
910 }
911 if (fixp->fx_where + fixp->fx_size
912 > fixp->fx_frag->fr_fix + fixp->fx_frag->fr_offset)
913 as_bad_where (fixp->fx_file, fixp->fx_line,
914 _("internal error: fixup not contained within frag"));
915 for (j = 0; reloc[j]; j++)
916 {
917 s = bfd_install_relocation (stdoutput, reloc[j],
918 fixp->fx_frag->fr_literal,
919 fixp->fx_frag->fr_address,
920 sec, &err);
921 switch (s)
922 {
923 case bfd_reloc_ok:
924 break;
925 case bfd_reloc_overflow:
926 as_bad_where (fixp->fx_file, fixp->fx_line,
927 _("relocation overflow"));
928 break;
929 case bfd_reloc_outofrange:
930 as_bad_where (fixp->fx_file, fixp->fx_line,
931 _("relocation out of range"));
932 break;
933 default:
934 as_fatal (_("%s:%u: bad return from bfd_install_relocation: %x"),
935 fixp->fx_file, fixp->fx_line, s);
936 }
937 }
938 }
939 n = i;
940 #endif
941
942 #ifdef DEBUG4
943 {
944 unsigned int i, j, nsyms;
945 asymbol **sympp;
946 sympp = bfd_get_outsymbols (stdoutput);
947 nsyms = bfd_get_symcount (stdoutput);
948 for (i = 0; i < n; i++)
949 if (((*relocs[i]->sym_ptr_ptr)->flags & BSF_SECTION_SYM) == 0)
950 {
951 for (j = 0; j < nsyms; j++)
952 if (sympp[j] == *relocs[i]->sym_ptr_ptr)
953 break;
954 if (j == nsyms)
955 abort ();
956 }
957 }
958 #endif
959
960 if (n)
961 bfd_set_reloc (stdoutput, sec, relocs, n);
962 else
963 bfd_set_section_flags (abfd, sec,
964 (bfd_get_section_flags (abfd, sec)
965 & (flagword) ~SEC_RELOC));
966
967 #ifdef SET_SECTION_RELOCS
968 SET_SECTION_RELOCS (sec, relocs, n);
969 #endif
970
971 #ifdef DEBUG3
972 {
973 unsigned int i;
974 arelent *r;
975 asymbol *s;
976 fprintf (stderr, "relocs for sec %s\n", sec->name);
977 for (i = 0; i < n; i++)
978 {
979 r = relocs[i];
980 s = *r->sym_ptr_ptr;
981 fprintf (stderr, " reloc %2d @%p off %4lx : sym %-10s addend %lx\n",
982 i, r, (unsigned long)r->address, s->name, (unsigned long)r->addend);
983 }
984 }
985 #endif
986 }
987
988 static void
989 write_contents (bfd *abfd ATTRIBUTE_UNUSED,
990 asection *sec,
991 PTR xxx ATTRIBUTE_UNUSED)
992 {
993 segment_info_type *seginfo = seg_info (sec);
994 addressT offset = 0;
995 fragS *f;
996
997 /* Write out the frags. */
998 if (seginfo == NULL
999 || !(bfd_get_section_flags (abfd, sec) & SEC_HAS_CONTENTS))
1000 return;
1001
1002 for (f = seginfo->frchainP->frch_root;
1003 f;
1004 f = f->fr_next)
1005 {
1006 int x;
1007 addressT fill_size;
1008 char *fill_literal;
1009 offsetT count;
1010
1011 assert (f->fr_type == rs_fill);
1012 if (f->fr_fix)
1013 {
1014 x = bfd_set_section_contents (stdoutput, sec,
1015 f->fr_literal, (file_ptr) offset,
1016 (bfd_size_type) f->fr_fix);
1017 if (!x)
1018 as_fatal (_("can't write %s: %s"), stdoutput->filename,
1019 bfd_errmsg (bfd_get_error ()));
1020 offset += f->fr_fix;
1021 }
1022 fill_literal = f->fr_literal + f->fr_fix;
1023 fill_size = f->fr_var;
1024 count = f->fr_offset;
1025 assert (count >= 0);
1026 if (fill_size && count)
1027 {
1028 char buf[256];
1029 if (fill_size > sizeof (buf))
1030 {
1031 /* Do it the old way. Can this ever happen? */
1032 while (count--)
1033 {
1034 x = bfd_set_section_contents (stdoutput, sec,
1035 fill_literal,
1036 (file_ptr) offset,
1037 (bfd_size_type) fill_size);
1038 if (!x)
1039 as_fatal (_("can't write %s: %s"), stdoutput->filename,
1040 bfd_errmsg (bfd_get_error ()));
1041 offset += fill_size;
1042 }
1043 }
1044 else
1045 {
1046 /* Build a buffer full of fill objects and output it as
1047 often as necessary. This saves on the overhead of
1048 potentially lots of bfd_set_section_contents calls. */
1049 int n_per_buf, i;
1050 if (fill_size == 1)
1051 {
1052 n_per_buf = sizeof (buf);
1053 memset (buf, *fill_literal, n_per_buf);
1054 }
1055 else
1056 {
1057 char *bufp;
1058 n_per_buf = sizeof (buf) / fill_size;
1059 for (i = n_per_buf, bufp = buf; i; i--, bufp += fill_size)
1060 memcpy (bufp, fill_literal, fill_size);
1061 }
1062 for (; count > 0; count -= n_per_buf)
1063 {
1064 n_per_buf = n_per_buf > count ? count : n_per_buf;
1065 x = bfd_set_section_contents
1066 (stdoutput, sec, buf, (file_ptr) offset,
1067 (bfd_size_type) n_per_buf * fill_size);
1068 if (!x)
1069 as_fatal (_("cannot write to output file"));
1070 offset += n_per_buf * fill_size;
1071 }
1072 }
1073 }
1074 }
1075 }
1076
1077 static void
1078 merge_data_into_text (void)
1079 {
1080 seg_info (text_section)->frchainP->frch_last->fr_next =
1081 seg_info (data_section)->frchainP->frch_root;
1082 seg_info (text_section)->frchainP->frch_last =
1083 seg_info (data_section)->frchainP->frch_last;
1084 seg_info (data_section)->frchainP = 0;
1085 }
1086
1087 static void
1088 set_symtab (void)
1089 {
1090 int nsyms;
1091 asymbol **asympp;
1092 symbolS *symp;
1093 bfd_boolean result;
1094 extern PTR bfd_alloc (bfd *, bfd_size_type);
1095
1096 /* Count symbols. We can't rely on a count made by the loop in
1097 write_object_file, because *_frob_file may add a new symbol or
1098 two. */
1099 nsyms = 0;
1100 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
1101 nsyms++;
1102
1103 if (nsyms)
1104 {
1105 int i;
1106 bfd_size_type amt = (bfd_size_type) nsyms * sizeof (asymbol *);
1107
1108 asympp = (asymbol **) bfd_alloc (stdoutput, amt);
1109 symp = symbol_rootP;
1110 for (i = 0; i < nsyms; i++, symp = symbol_next (symp))
1111 {
1112 asympp[i] = symbol_get_bfdsym (symp);
1113 symbol_mark_written (symp);
1114 }
1115 }
1116 else
1117 asympp = 0;
1118 result = bfd_set_symtab (stdoutput, asympp, nsyms);
1119 assert (result);
1120 symbol_table_frozen = 1;
1121 }
1122
1123 /* Finish the subsegments. After every sub-segment, we fake an
1124 ".align ...". This conforms to BSD4.2 brane-damage. We then fake
1125 ".fill 0" because that is the kind of frag that requires least
1126 thought. ".align" frags like to have a following frag since that
1127 makes calculating their intended length trivial. */
1128
1129 #ifndef SUB_SEGMENT_ALIGN
1130 #ifdef HANDLE_ALIGN
1131 /* The last subsegment gets an alignment corresponding to the alignment
1132 of the section. This allows proper nop-filling at the end of
1133 code-bearing sections. */
1134 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) \
1135 (!(FRCHAIN)->frch_next ? get_recorded_alignment (SEG) : 0)
1136 #else
1137 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) 0
1138 #endif
1139 #endif
1140
1141 void
1142 subsegs_finish (void)
1143 {
1144 struct frchain *frchainP;
1145 asection *s;
1146
1147 for (s = stdoutput->sections; s; s = s->next)
1148 {
1149 segment_info_type *seginfo = seg_info (s);
1150 if (!seginfo)
1151 continue;
1152
1153 for (frchainP = seginfo->frchainP;
1154 frchainP != NULL;
1155 frchainP = frchainP->frch_next)
1156 {
1157 int alignment = 0;
1158
1159 subseg_set (s, frchainP->frch_subseg);
1160
1161 /* This now gets called even if we had errors. In that case,
1162 any alignment is meaningless, and, moreover, will look weird
1163 if we are generating a listing. */
1164 if (!had_errors ())
1165 {
1166 alignment = SUB_SEGMENT_ALIGN (now_seg, frchainP);
1167 if ((bfd_get_section_flags (now_seg->owner, now_seg) & SEC_MERGE)
1168 && now_seg->entsize)
1169 {
1170 unsigned int entsize = now_seg->entsize;
1171 int entalign = 0;
1172
1173 while ((entsize & 1) == 0)
1174 {
1175 ++entalign;
1176 entsize >>= 1;
1177 }
1178 if (entalign > alignment)
1179 alignment = entalign;
1180 }
1181 }
1182
1183 if (subseg_text_p (now_seg))
1184 frag_align_code (alignment, 0);
1185 else
1186 frag_align (alignment, 0, 0);
1187
1188 /* frag_align will have left a new frag.
1189 Use this last frag for an empty ".fill".
1190
1191 For this segment ...
1192 Create a last frag. Do not leave a "being filled in frag". */
1193 frag_wane (frag_now);
1194 frag_now->fr_fix = 0;
1195 know (frag_now->fr_next == NULL);
1196 }
1197 }
1198 }
1199
1200 /* Write the object file. */
1201
1202 void
1203 write_object_file (void)
1204 {
1205 struct relax_seg_info rsi;
1206 #ifndef WORKING_DOT_WORD
1207 fragS *fragP; /* Track along all frags. */
1208 #endif
1209
1210 /* Do we really want to write it? */
1211 {
1212 int n_warns, n_errs;
1213 n_warns = had_warnings ();
1214 n_errs = had_errors ();
1215 /* The -Z flag indicates that an object file should be generated,
1216 regardless of warnings and errors. */
1217 if (flag_always_generate_output)
1218 {
1219 if (n_warns || n_errs)
1220 as_warn (_("%d error%s, %d warning%s, generating bad object file"),
1221 n_errs, n_errs == 1 ? "" : "s",
1222 n_warns, n_warns == 1 ? "" : "s");
1223 }
1224 else
1225 {
1226 if (n_errs)
1227 as_fatal (_("%d error%s, %d warning%s, no object file generated"),
1228 n_errs, n_errs == 1 ? "" : "s",
1229 n_warns, n_warns == 1 ? "" : "s");
1230 }
1231 }
1232
1233 #ifdef OBJ_VMS
1234 /* Under VMS we try to be compatible with VAX-11 "C". Thus, we call
1235 a routine to check for the definition of the procedure "_main",
1236 and if so -- fix it up so that it can be program entry point. */
1237 vms_check_for_main ();
1238 #endif /* OBJ_VMS */
1239
1240 /* From now on, we don't care about sub-segments. Build one frag chain
1241 for each segment. Linked thru fr_next. */
1242
1243 /* Remove the sections created by gas for its own purposes. */
1244 {
1245 int i;
1246
1247 bfd_section_list_remove (stdoutput, reg_section);
1248 bfd_section_list_remove (stdoutput, expr_section);
1249 stdoutput->section_count -= 2;
1250 i = 0;
1251 bfd_map_over_sections (stdoutput, renumber_sections, &i);
1252 }
1253
1254 bfd_map_over_sections (stdoutput, chain_frchains_together, (char *) 0);
1255
1256 /* We have two segments. If user gave -R flag, then we must put the
1257 data frags into the text segment. Do this before relaxing so
1258 we know to take advantage of -R and make shorter addresses. */
1259 if (flag_readonly_data_in_text)
1260 {
1261 merge_data_into_text ();
1262 }
1263
1264 rsi.pass = 0;
1265 while (1)
1266 {
1267 #ifndef WORKING_DOT_WORD
1268 /* We need to reset the markers in the broken word list and
1269 associated frags between calls to relax_segment (via
1270 relax_seg). Since the broken word list is global, we do it
1271 once per round, rather than locally in relax_segment for each
1272 segment. */
1273 struct broken_word *brokp;
1274
1275 for (brokp = broken_words;
1276 brokp != (struct broken_word *) NULL;
1277 brokp = brokp->next_broken_word)
1278 {
1279 brokp->added = 0;
1280
1281 if (brokp->dispfrag != (fragS *) NULL
1282 && brokp->dispfrag->fr_type == rs_broken_word)
1283 brokp->dispfrag->fr_subtype = 0;
1284 }
1285 #endif
1286
1287 rsi.changed = 0;
1288 bfd_map_over_sections (stdoutput, relax_seg, &rsi);
1289 rsi.pass++;
1290 if (!rsi.changed)
1291 break;
1292 }
1293
1294 /* Note - Most ports will use the default value of
1295 TC_FINALIZE_SYMS_BEFORE_SIZE_SEG, which 1. This will force
1296 local symbols to be resolved, removing their frag information.
1297 Some ports however, will not have finished relaxing all of
1298 their frags and will still need the local symbol frag
1299 information. These ports can set
1300 TC_FINALIZE_SYMS_BEFORE_SIZE_SEG to 0. */
1301 finalize_syms = TC_FINALIZE_SYMS_BEFORE_SIZE_SEG;
1302
1303 bfd_map_over_sections (stdoutput, size_seg, (char *) 0);
1304
1305 /* Relaxation has completed. Freeze all syms. */
1306 finalize_syms = 1;
1307
1308 #ifdef md_post_relax_hook
1309 md_post_relax_hook;
1310 #endif
1311
1312 #ifndef WORKING_DOT_WORD
1313 {
1314 struct broken_word *lie;
1315 struct broken_word **prevP;
1316
1317 prevP = &broken_words;
1318 for (lie = broken_words; lie; lie = lie->next_broken_word)
1319 if (!lie->added)
1320 {
1321 expressionS exp;
1322
1323 subseg_change (lie->seg, lie->subseg);
1324 exp.X_op = O_subtract;
1325 exp.X_add_symbol = lie->add;
1326 exp.X_op_symbol = lie->sub;
1327 exp.X_add_number = lie->addnum;
1328 #ifdef TC_CONS_FIX_NEW
1329 TC_CONS_FIX_NEW (lie->frag,
1330 lie->word_goes_here - lie->frag->fr_literal,
1331 2, &exp);
1332 #else
1333 fix_new_exp (lie->frag,
1334 lie->word_goes_here - lie->frag->fr_literal,
1335 2, &exp, 0, BFD_RELOC_16);
1336 #endif
1337 *prevP = lie->next_broken_word;
1338 }
1339 else
1340 prevP = &(lie->next_broken_word);
1341
1342 for (lie = broken_words; lie;)
1343 {
1344 struct broken_word *untruth;
1345 char *table_ptr;
1346 addressT table_addr;
1347 addressT from_addr, to_addr;
1348 int n, m;
1349
1350 subseg_change (lie->seg, lie->subseg);
1351 fragP = lie->dispfrag;
1352
1353 /* Find out how many broken_words go here. */
1354 n = 0;
1355 for (untruth = lie;
1356 untruth && untruth->dispfrag == fragP;
1357 untruth = untruth->next_broken_word)
1358 if (untruth->added == 1)
1359 n++;
1360
1361 table_ptr = lie->dispfrag->fr_opcode;
1362 table_addr = (lie->dispfrag->fr_address
1363 + (table_ptr - lie->dispfrag->fr_literal));
1364 /* Create the jump around the long jumps. This is a short
1365 jump from table_ptr+0 to table_ptr+n*long_jump_size. */
1366 from_addr = table_addr;
1367 to_addr = table_addr + md_short_jump_size + n * md_long_jump_size;
1368 md_create_short_jump (table_ptr, from_addr, to_addr, lie->dispfrag,
1369 lie->add);
1370 table_ptr += md_short_jump_size;
1371 table_addr += md_short_jump_size;
1372
1373 for (m = 0;
1374 lie && lie->dispfrag == fragP;
1375 m++, lie = lie->next_broken_word)
1376 {
1377 if (lie->added == 2)
1378 continue;
1379 /* Patch the jump table. */
1380 /* This is the offset from ??? to table_ptr+0. */
1381 to_addr = table_addr - S_GET_VALUE (lie->sub);
1382 #ifdef TC_CHECK_ADJUSTED_BROKEN_DOT_WORD
1383 TC_CHECK_ADJUSTED_BROKEN_DOT_WORD (to_addr, lie);
1384 #endif
1385 md_number_to_chars (lie->word_goes_here, to_addr, 2);
1386 for (untruth = lie->next_broken_word;
1387 untruth && untruth->dispfrag == fragP;
1388 untruth = untruth->next_broken_word)
1389 {
1390 if (untruth->use_jump == lie)
1391 md_number_to_chars (untruth->word_goes_here, to_addr, 2);
1392 }
1393
1394 /* Install the long jump. */
1395 /* This is a long jump from table_ptr+0 to the final target. */
1396 from_addr = table_addr;
1397 to_addr = S_GET_VALUE (lie->add) + lie->addnum;
1398 md_create_long_jump (table_ptr, from_addr, to_addr, lie->dispfrag,
1399 lie->add);
1400 table_ptr += md_long_jump_size;
1401 table_addr += md_long_jump_size;
1402 }
1403 }
1404 }
1405 #endif /* not WORKING_DOT_WORD */
1406
1407 /* Resolve symbol values. This needs to be done before processing
1408 the relocations. */
1409 if (symbol_rootP)
1410 {
1411 symbolS *symp;
1412
1413 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
1414 resolve_symbol_value (symp);
1415 }
1416 resolve_local_symbol_values ();
1417
1418 PROGRESS (1);
1419
1420 #ifdef tc_frob_file_before_adjust
1421 tc_frob_file_before_adjust ();
1422 #endif
1423 #ifdef obj_frob_file_before_adjust
1424 obj_frob_file_before_adjust ();
1425 #endif
1426
1427 bfd_map_over_sections (stdoutput, adjust_reloc_syms, (char *) 0);
1428
1429 #ifdef tc_frob_file_before_fix
1430 tc_frob_file_before_fix ();
1431 #endif
1432 #ifdef obj_frob_file_before_fix
1433 obj_frob_file_before_fix ();
1434 #endif
1435
1436 bfd_map_over_sections (stdoutput, fix_segment, (char *) 0);
1437
1438 /* Set up symbol table, and write it out. */
1439 if (symbol_rootP)
1440 {
1441 symbolS *symp;
1442 bfd_boolean skip_next_symbol = FALSE;
1443
1444 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
1445 {
1446 int punt = 0;
1447 const char *name;
1448
1449 if (skip_next_symbol)
1450 {
1451 /* Don't do anything besides moving the value of the
1452 symbol from the GAS value-field to the BFD value-field. */
1453 symbol_get_bfdsym (symp)->value = S_GET_VALUE (symp);
1454 skip_next_symbol = FALSE;
1455 continue;
1456 }
1457
1458 if (symbol_mri_common_p (symp))
1459 {
1460 if (S_IS_EXTERNAL (symp))
1461 as_bad (_("%s: global symbols not supported in common sections"),
1462 S_GET_NAME (symp));
1463 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
1464 continue;
1465 }
1466
1467 name = S_GET_NAME (symp);
1468 if (name)
1469 {
1470 const char *name2 =
1471 decode_local_label_name ((char *) S_GET_NAME (symp));
1472 /* They only differ if `name' is a fb or dollar local
1473 label name. */
1474 if (name2 != name && ! S_IS_DEFINED (symp))
1475 as_bad (_("local label `%s' is not defined"), name2);
1476 }
1477
1478 /* Do it again, because adjust_reloc_syms might introduce
1479 more symbols. They'll probably only be section symbols,
1480 but they'll still need to have the values computed. */
1481 resolve_symbol_value (symp);
1482
1483 /* Skip symbols which were equated to undefined or common
1484 symbols. */
1485 if (symbol_equated_reloc_p (symp)
1486 || S_IS_WEAKREFR (symp))
1487 {
1488 const char *name = S_GET_NAME (symp);
1489 if (S_IS_COMMON (symp)
1490 && !TC_FAKE_LABEL (name)
1491 && !S_IS_WEAKREFR (symp)
1492 && (!S_IS_EXTERNAL (symp) || S_IS_LOCAL (symp)))
1493 {
1494 expressionS *e = symbol_get_value_expression (symp);
1495 as_bad (_("Local symbol `%s' can't be equated to common symbol `%s'"),
1496 name, S_GET_NAME (e->X_add_symbol));
1497 }
1498 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
1499 continue;
1500 }
1501
1502 #ifdef obj_frob_symbol
1503 obj_frob_symbol (symp, punt);
1504 #endif
1505 #ifdef tc_frob_symbol
1506 if (! punt || symbol_used_in_reloc_p (symp))
1507 tc_frob_symbol (symp, punt);
1508 #endif
1509
1510 /* If we don't want to keep this symbol, splice it out of
1511 the chain now. If EMIT_SECTION_SYMBOLS is 0, we never
1512 want section symbols. Otherwise, we skip local symbols
1513 and symbols that the frob_symbol macros told us to punt,
1514 but we keep such symbols if they are used in relocs. */
1515 if (symp == abs_section_sym
1516 || (! EMIT_SECTION_SYMBOLS
1517 && symbol_section_p (symp))
1518 /* Note that S_IS_EXTERNAL and S_IS_LOCAL are not always
1519 opposites. Sometimes the former checks flags and the
1520 latter examines the name... */
1521 || (!S_IS_EXTERNAL (symp)
1522 && (punt || S_IS_LOCAL (symp) ||
1523 (S_IS_WEAKREFD (symp) && ! symbol_used_p (symp)))
1524 && ! symbol_used_in_reloc_p (symp)))
1525 {
1526 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
1527
1528 /* After symbol_remove, symbol_next(symp) still returns
1529 the one that came after it in the chain. So we don't
1530 need to do any extra cleanup work here. */
1531 continue;
1532 }
1533
1534 /* Make sure we really got a value for the symbol. */
1535 if (! symbol_resolved_p (symp))
1536 {
1537 as_bad (_("can't resolve value for symbol `%s'"),
1538 S_GET_NAME (symp));
1539 symbol_mark_resolved (symp);
1540 }
1541
1542 /* Set the value into the BFD symbol. Up til now the value
1543 has only been kept in the gas symbolS struct. */
1544 symbol_get_bfdsym (symp)->value = S_GET_VALUE (symp);
1545
1546 /* A warning construct is a warning symbol followed by the
1547 symbol warned about. Don't let anything object-format or
1548 target-specific muck with it; it's ready for output. */
1549 if (symbol_get_bfdsym (symp)->flags & BSF_WARNING)
1550 skip_next_symbol = TRUE;
1551 }
1552 }
1553
1554 PROGRESS (1);
1555
1556 /* Now do any format-specific adjustments to the symbol table, such
1557 as adding file symbols. */
1558 #ifdef tc_adjust_symtab
1559 tc_adjust_symtab ();
1560 #endif
1561 #ifdef obj_adjust_symtab
1562 obj_adjust_symtab ();
1563 #endif
1564
1565 /* Now that all the sizes are known, and contents correct, we can
1566 start writing to the file. */
1567 set_symtab ();
1568
1569 /* If *_frob_file changes the symbol value at this point, it is
1570 responsible for moving the changed value into symp->bsym->value
1571 as well. Hopefully all symbol value changing can be done in
1572 *_frob_symbol. */
1573 #ifdef tc_frob_file
1574 tc_frob_file ();
1575 #endif
1576 #ifdef obj_frob_file
1577 obj_frob_file ();
1578 #endif
1579
1580 bfd_map_over_sections (stdoutput, write_relocs, (char *) 0);
1581
1582 #ifdef tc_frob_file_after_relocs
1583 tc_frob_file_after_relocs ();
1584 #endif
1585 #ifdef obj_frob_file_after_relocs
1586 obj_frob_file_after_relocs ();
1587 #endif
1588
1589 bfd_map_over_sections (stdoutput, write_contents, (char *) 0);
1590 }
1591
1592 #ifdef TC_GENERIC_RELAX_TABLE
1593 /* Relax a fragment by scanning TC_GENERIC_RELAX_TABLE. */
1594
1595 long
1596 relax_frag (segT segment, fragS *fragP, long stretch)
1597 {
1598 const relax_typeS *this_type;
1599 const relax_typeS *start_type;
1600 relax_substateT next_state;
1601 relax_substateT this_state;
1602 offsetT growth;
1603 offsetT aim;
1604 addressT target;
1605 addressT address;
1606 symbolS *symbolP;
1607 const relax_typeS *table;
1608
1609 target = fragP->fr_offset;
1610 address = fragP->fr_address;
1611 table = TC_GENERIC_RELAX_TABLE;
1612 this_state = fragP->fr_subtype;
1613 start_type = this_type = table + this_state;
1614 symbolP = fragP->fr_symbol;
1615
1616 if (symbolP)
1617 {
1618 fragS *sym_frag;
1619
1620 sym_frag = symbol_get_frag (symbolP);
1621
1622 #ifndef DIFF_EXPR_OK
1623 know (sym_frag != NULL);
1624 #endif
1625 know (S_GET_SEGMENT (symbolP) != absolute_section
1626 || sym_frag == &zero_address_frag);
1627 target += S_GET_VALUE (symbolP);
1628
1629 /* If frag has yet to be reached on this pass,
1630 assume it will move by STRETCH just as we did.
1631 If this is not so, it will be because some frag
1632 between grows, and that will force another pass. */
1633
1634 if (stretch != 0
1635 && sym_frag->relax_marker != fragP->relax_marker
1636 && S_GET_SEGMENT (symbolP) == segment)
1637 {
1638 target += stretch;
1639 }
1640 }
1641
1642 aim = target - address - fragP->fr_fix;
1643 #ifdef TC_PCREL_ADJUST
1644 /* Currently only the ns32k family needs this. */
1645 aim += TC_PCREL_ADJUST (fragP);
1646 #endif
1647
1648 #ifdef md_prepare_relax_scan
1649 /* Formerly called M68K_AIM_KLUDGE. */
1650 md_prepare_relax_scan (fragP, address, aim, this_state, this_type);
1651 #endif
1652
1653 if (aim < 0)
1654 {
1655 /* Look backwards. */
1656 for (next_state = this_type->rlx_more; next_state;)
1657 if (aim >= this_type->rlx_backward)
1658 next_state = 0;
1659 else
1660 {
1661 /* Grow to next state. */
1662 this_state = next_state;
1663 this_type = table + this_state;
1664 next_state = this_type->rlx_more;
1665 }
1666 }
1667 else
1668 {
1669 /* Look forwards. */
1670 for (next_state = this_type->rlx_more; next_state;)
1671 if (aim <= this_type->rlx_forward)
1672 next_state = 0;
1673 else
1674 {
1675 /* Grow to next state. */
1676 this_state = next_state;
1677 this_type = table + this_state;
1678 next_state = this_type->rlx_more;
1679 }
1680 }
1681
1682 growth = this_type->rlx_length - start_type->rlx_length;
1683 if (growth != 0)
1684 fragP->fr_subtype = this_state;
1685 return growth;
1686 }
1687
1688 #endif /* defined (TC_GENERIC_RELAX_TABLE) */
1689
1690 /* Relax_align. Advance location counter to next address that has 'alignment'
1691 lowest order bits all 0s, return size of adjustment made. */
1692 static relax_addressT
1693 relax_align (register relax_addressT address, /* Address now. */
1694 register int alignment /* Alignment (binary). */)
1695 {
1696 relax_addressT mask;
1697 relax_addressT new_address;
1698
1699 mask = ~((~0) << alignment);
1700 new_address = (address + mask) & (~mask);
1701 #ifdef LINKER_RELAXING_SHRINKS_ONLY
1702 if (linkrelax)
1703 /* We must provide lots of padding, so the linker can discard it
1704 when needed. The linker will not add extra space, ever. */
1705 new_address += (1 << alignment);
1706 #endif
1707 return (new_address - address);
1708 }
1709
1710 /* Now we have a segment, not a crowd of sub-segments, we can make
1711 fr_address values.
1712
1713 Relax the frags.
1714
1715 After this, all frags in this segment have addresses that are correct
1716 within the segment. Since segments live in different file addresses,
1717 these frag addresses may not be the same as final object-file
1718 addresses. */
1719
1720 int
1721 relax_segment (struct frag *segment_frag_root, segT segment, int pass)
1722 {
1723 unsigned long frag_count;
1724 struct frag *fragP;
1725 relax_addressT address;
1726 int ret;
1727
1728 /* In case md_estimate_size_before_relax() wants to make fixSs. */
1729 subseg_change (segment, 0);
1730
1731 /* For each frag in segment: count and store (a 1st guess of)
1732 fr_address. */
1733 address = 0;
1734 for (frag_count = 0, fragP = segment_frag_root;
1735 fragP;
1736 fragP = fragP->fr_next, frag_count ++)
1737 {
1738 fragP->relax_marker = 0;
1739 fragP->fr_address = address;
1740 address += fragP->fr_fix;
1741
1742 switch (fragP->fr_type)
1743 {
1744 case rs_fill:
1745 address += fragP->fr_offset * fragP->fr_var;
1746 break;
1747
1748 case rs_align:
1749 case rs_align_code:
1750 case rs_align_test:
1751 {
1752 addressT offset = relax_align (address, (int) fragP->fr_offset);
1753
1754 if (fragP->fr_subtype != 0 && offset > fragP->fr_subtype)
1755 offset = 0;
1756
1757 if (offset % fragP->fr_var != 0)
1758 {
1759 as_bad_where (fragP->fr_file, fragP->fr_line,
1760 _("alignment padding (%lu bytes) not a multiple of %ld"),
1761 (unsigned long) offset, (long) fragP->fr_var);
1762 offset -= (offset % fragP->fr_var);
1763 }
1764
1765 address += offset;
1766 }
1767 break;
1768
1769 case rs_org:
1770 case rs_space:
1771 /* Assume .org is nugatory. It will grow with 1st relax. */
1772 break;
1773
1774 case rs_machine_dependent:
1775 /* If fr_symbol is an expression, this call to
1776 resolve_symbol_value sets up the correct segment, which will
1777 likely be needed in md_estimate_size_before_relax. */
1778 if (fragP->fr_symbol)
1779 resolve_symbol_value (fragP->fr_symbol);
1780
1781 address += md_estimate_size_before_relax (fragP, segment);
1782 break;
1783
1784 #ifndef WORKING_DOT_WORD
1785 /* Broken words don't concern us yet. */
1786 case rs_broken_word:
1787 break;
1788 #endif
1789
1790 case rs_leb128:
1791 /* Initial guess is always 1; doing otherwise can result in
1792 stable solutions that are larger than the minimum. */
1793 address += fragP->fr_offset = 1;
1794 break;
1795
1796 case rs_cfa:
1797 address += eh_frame_estimate_size_before_relax (fragP);
1798 break;
1799
1800 case rs_dwarf2dbg:
1801 address += dwarf2dbg_estimate_size_before_relax (fragP);
1802 break;
1803
1804 default:
1805 BAD_CASE (fragP->fr_type);
1806 break;
1807 }
1808 }
1809
1810 /* Do relax(). */
1811 {
1812 unsigned long max_iterations;
1813 offsetT stretch; /* May be any size, 0 or negative. */
1814 /* Cumulative number of addresses we have relaxed this pass.
1815 We may have relaxed more than one address. */
1816 int stretched; /* Have we stretched on this pass? */
1817 /* This is 'cuz stretch may be zero, when, in fact some piece of code
1818 grew, and another shrank. If a branch instruction doesn't fit anymore,
1819 we could be scrod. */
1820
1821 /* We want to prevent going into an infinite loop where one frag grows
1822 depending upon the location of a symbol which is in turn moved by
1823 the growing frag. eg:
1824
1825 foo = .
1826 .org foo+16
1827 foo = .
1828
1829 So we dictate that this algorithm can be at most O2. */
1830 max_iterations = frag_count * frag_count;
1831 /* Check for overflow. */
1832 if (max_iterations < frag_count)
1833 max_iterations = frag_count;
1834
1835 ret = 0;
1836 do
1837 {
1838 stretch = 0;
1839 stretched = 0;
1840
1841 for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next)
1842 {
1843 offsetT growth = 0;
1844 addressT was_address;
1845 offsetT offset;
1846 symbolS *symbolP;
1847
1848 fragP->relax_marker ^= 1;
1849 was_address = fragP->fr_address;
1850 address = fragP->fr_address += stretch;
1851 symbolP = fragP->fr_symbol;
1852 offset = fragP->fr_offset;
1853
1854 switch (fragP->fr_type)
1855 {
1856 case rs_fill: /* .fill never relaxes. */
1857 growth = 0;
1858 break;
1859
1860 #ifndef WORKING_DOT_WORD
1861 /* JF: This is RMS's idea. I do *NOT* want to be blamed
1862 for it I do not want to write it. I do not want to have
1863 anything to do with it. This is not the proper way to
1864 implement this misfeature. */
1865 case rs_broken_word:
1866 {
1867 struct broken_word *lie;
1868 struct broken_word *untruth;
1869
1870 /* Yes this is ugly (storing the broken_word pointer
1871 in the symbol slot). Still, this whole chunk of
1872 code is ugly, and I don't feel like doing anything
1873 about it. Think of it as stubbornness in action. */
1874 growth = 0;
1875 for (lie = (struct broken_word *) (fragP->fr_symbol);
1876 lie && lie->dispfrag == fragP;
1877 lie = lie->next_broken_word)
1878 {
1879
1880 if (lie->added)
1881 continue;
1882
1883 offset = (S_GET_VALUE (lie->add)
1884 + lie->addnum
1885 - S_GET_VALUE (lie->sub));
1886 if (offset <= -32768 || offset >= 32767)
1887 {
1888 if (flag_warn_displacement)
1889 {
1890 char buf[50];
1891 sprint_value (buf, (addressT) lie->addnum);
1892 as_warn_where (fragP->fr_file, fragP->fr_line,
1893 _(".word %s-%s+%s didn't fit"),
1894 S_GET_NAME (lie->add),
1895 S_GET_NAME (lie->sub),
1896 buf);
1897 }
1898 lie->added = 1;
1899 if (fragP->fr_subtype == 0)
1900 {
1901 fragP->fr_subtype++;
1902 growth += md_short_jump_size;
1903 }
1904 for (untruth = lie->next_broken_word;
1905 untruth && untruth->dispfrag == lie->dispfrag;
1906 untruth = untruth->next_broken_word)
1907 if ((symbol_get_frag (untruth->add)
1908 == symbol_get_frag (lie->add))
1909 && (S_GET_VALUE (untruth->add)
1910 == S_GET_VALUE (lie->add)))
1911 {
1912 untruth->added = 2;
1913 untruth->use_jump = lie;
1914 }
1915 growth += md_long_jump_size;
1916 }
1917 }
1918
1919 break;
1920 } /* case rs_broken_word */
1921 #endif
1922 case rs_align:
1923 case rs_align_code:
1924 case rs_align_test:
1925 {
1926 addressT oldoff, newoff;
1927
1928 oldoff = relax_align (was_address + fragP->fr_fix,
1929 (int) offset);
1930 newoff = relax_align (address + fragP->fr_fix,
1931 (int) offset);
1932
1933 if (fragP->fr_subtype != 0)
1934 {
1935 if (oldoff > fragP->fr_subtype)
1936 oldoff = 0;
1937 if (newoff > fragP->fr_subtype)
1938 newoff = 0;
1939 }
1940
1941 growth = newoff - oldoff;
1942 }
1943 break;
1944
1945 case rs_org:
1946 {
1947 addressT target = offset;
1948 addressT after;
1949
1950 if (symbolP)
1951 {
1952 /* Convert from an actual address to an octet offset
1953 into the section. Here it is assumed that the
1954 section's VMA is zero, and can omit subtracting it
1955 from the symbol's value to get the address offset. */
1956 know (S_GET_SEGMENT (symbolP)->vma == 0);
1957 target += S_GET_VALUE (symbolP) * OCTETS_PER_BYTE;
1958 }
1959
1960 know (fragP->fr_next);
1961 after = fragP->fr_next->fr_address;
1962 growth = target - after;
1963 if (growth < 0)
1964 {
1965 growth = 0;
1966
1967 /* Don't error on first few frag relax passes.
1968 The symbol might be an expression involving
1969 symbol values from other sections. If those
1970 sections have not yet been processed their
1971 frags will all have zero addresses, so we
1972 will calculate incorrect values for them. The
1973 number of passes we allow before giving an
1974 error is somewhat arbitrary. It should be at
1975 least one, with larger values requiring
1976 increasingly contrived dependencies between
1977 frags to trigger a false error. */
1978 if (pass < 2)
1979 {
1980 /* Force another pass. */
1981 ret = 1;
1982 break;
1983 }
1984
1985 /* Growth may be negative, but variable part of frag
1986 cannot have fewer than 0 chars. That is, we can't
1987 .org backwards. */
1988 as_bad_where (fragP->fr_file, fragP->fr_line,
1989 _("attempt to move .org backwards"));
1990
1991 /* We've issued an error message. Change the
1992 frag to avoid cascading errors. */
1993 fragP->fr_type = rs_align;
1994 fragP->fr_subtype = 0;
1995 fragP->fr_offset = 0;
1996 fragP->fr_fix = after - was_address;
1997 break;
1998 }
1999
2000 /* This is an absolute growth factor */
2001 growth -= stretch;
2002 break;
2003 }
2004
2005 case rs_space:
2006 growth = 0;
2007 if (symbolP)
2008 {
2009 offsetT amount;
2010
2011 amount = S_GET_VALUE (symbolP);
2012 if (S_GET_SEGMENT (symbolP) != absolute_section
2013 || S_IS_COMMON (symbolP)
2014 || ! S_IS_DEFINED (symbolP))
2015 {
2016 as_bad_where (fragP->fr_file, fragP->fr_line,
2017 _(".space specifies non-absolute value"));
2018 /* Prevent repeat of this error message. */
2019 fragP->fr_symbol = 0;
2020 }
2021 else if (amount < 0)
2022 {
2023 /* Don't error on first few frag relax passes.
2024 See rs_org comment for a longer explanation. */
2025 if (pass < 2)
2026 {
2027 ret = 1;
2028 break;
2029 }
2030
2031 as_warn_where (fragP->fr_file, fragP->fr_line,
2032 _(".space or .fill with negative value, ignored"));
2033 fragP->fr_symbol = 0;
2034 }
2035 else
2036 growth = (was_address + fragP->fr_fix + amount
2037 - fragP->fr_next->fr_address);
2038 }
2039 break;
2040
2041 case rs_machine_dependent:
2042 #ifdef md_relax_frag
2043 growth = md_relax_frag (segment, fragP, stretch);
2044 #else
2045 #ifdef TC_GENERIC_RELAX_TABLE
2046 /* The default way to relax a frag is to look through
2047 TC_GENERIC_RELAX_TABLE. */
2048 growth = relax_frag (segment, fragP, stretch);
2049 #endif /* TC_GENERIC_RELAX_TABLE */
2050 #endif
2051 break;
2052
2053 case rs_leb128:
2054 {
2055 valueT value;
2056 offsetT size;
2057
2058 value = resolve_symbol_value (fragP->fr_symbol);
2059 size = sizeof_leb128 (value, fragP->fr_subtype);
2060 growth = size - fragP->fr_offset;
2061 fragP->fr_offset = size;
2062 }
2063 break;
2064
2065 case rs_cfa:
2066 growth = eh_frame_relax_frag (fragP);
2067 break;
2068
2069 case rs_dwarf2dbg:
2070 growth = dwarf2dbg_relax_frag (fragP);
2071 break;
2072
2073 default:
2074 BAD_CASE (fragP->fr_type);
2075 break;
2076 }
2077 if (growth)
2078 {
2079 stretch += growth;
2080 stretched = 1;
2081 }
2082 }
2083 }
2084 /* Until nothing further to relax. */
2085 while (stretched && -- max_iterations);
2086
2087 if (stretched)
2088 as_fatal (_("Infinite loop encountered whilst attempting to compute the addresses of symbols in section %s"),
2089 segment_name (segment));
2090 }
2091
2092 for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next)
2093 if (fragP->last_fr_address != fragP->fr_address)
2094 {
2095 fragP->last_fr_address = fragP->fr_address;
2096 ret = 1;
2097 }
2098 return ret;
2099 }
2100
2101 /* fixup_segment()
2102
2103 Go through all the fixS's in a segment and see which ones can be
2104 handled now. (These consist of fixS where we have since discovered
2105 the value of a symbol, or the address of the frag involved.)
2106 For each one, call md_apply_fix to put the fix into the frag data.
2107
2108 Result is a count of how many relocation structs will be needed to
2109 handle the remaining fixS's that we couldn't completely handle here.
2110 These will be output later by emit_relocations(). */
2111
2112 static long
2113 fixup_segment (fixS *fixP, segT this_segment)
2114 {
2115 long seg_reloc_count = 0;
2116 valueT add_number;
2117 fragS *fragP;
2118 segT add_symbol_segment = absolute_section;
2119
2120 if (fixP != NULL && abs_section_sym == NULL)
2121 abs_section_sym = section_symbol (absolute_section);
2122
2123 /* If the linker is doing the relaxing, we must not do any fixups.
2124
2125 Well, strictly speaking that's not true -- we could do any that
2126 are PC-relative and don't cross regions that could change size.
2127 And for the i960 we might be able to turn callx/callj into bal
2128 anyways in cases where we know the maximum displacement. */
2129 if (linkrelax && TC_LINKRELAX_FIXUP (this_segment))
2130 {
2131 for (; fixP; fixP = fixP->fx_next)
2132 if (!fixP->fx_done)
2133 {
2134 if (fixP->fx_addsy == NULL)
2135 {
2136 /* There was no symbol required by this relocation.
2137 However, BFD doesn't really handle relocations
2138 without symbols well. So fake up a local symbol in
2139 the absolute section. */
2140 fixP->fx_addsy = abs_section_sym;
2141 }
2142 symbol_mark_used_in_reloc (fixP->fx_addsy);
2143 if (fixP->fx_subsy != NULL)
2144 symbol_mark_used_in_reloc (fixP->fx_subsy);
2145 seg_reloc_count++;
2146 }
2147 TC_ADJUST_RELOC_COUNT (fixP, seg_reloc_count);
2148 return seg_reloc_count;
2149 }
2150
2151 for (; fixP; fixP = fixP->fx_next)
2152 {
2153 #ifdef DEBUG5
2154 fprintf (stderr, "\nprocessing fixup:\n");
2155 print_fixup (fixP);
2156 #endif
2157
2158 fragP = fixP->fx_frag;
2159 know (fragP);
2160 #ifdef TC_VALIDATE_FIX
2161 TC_VALIDATE_FIX (fixP, this_segment, skip);
2162 #endif
2163 add_number = fixP->fx_offset;
2164
2165 if (fixP->fx_addsy != NULL
2166 && symbol_mri_common_p (fixP->fx_addsy))
2167 {
2168 add_number += S_GET_VALUE (fixP->fx_addsy);
2169 fixP->fx_offset = add_number;
2170 fixP->fx_addsy
2171 = symbol_get_value_expression (fixP->fx_addsy)->X_add_symbol;
2172 }
2173
2174 if (fixP->fx_addsy != NULL)
2175 add_symbol_segment = S_GET_SEGMENT (fixP->fx_addsy);
2176
2177 if (fixP->fx_subsy != NULL)
2178 {
2179 segT sub_symbol_segment;
2180 resolve_symbol_value (fixP->fx_subsy);
2181 sub_symbol_segment = S_GET_SEGMENT (fixP->fx_subsy);
2182 if (fixP->fx_addsy != NULL
2183 && sub_symbol_segment == add_symbol_segment
2184 && !TC_FORCE_RELOCATION_SUB_SAME (fixP, add_symbol_segment))
2185 {
2186 add_number += S_GET_VALUE (fixP->fx_addsy);
2187 add_number -= S_GET_VALUE (fixP->fx_subsy);
2188 fixP->fx_offset = add_number;
2189 fixP->fx_addsy = NULL;
2190 fixP->fx_subsy = NULL;
2191 #ifdef TC_M68K
2192 /* See the comment below about 68k weirdness. */
2193 fixP->fx_pcrel = 0;
2194 #endif
2195 }
2196 else if (sub_symbol_segment == absolute_section
2197 && !TC_FORCE_RELOCATION_SUB_ABS (fixP))
2198 {
2199 add_number -= S_GET_VALUE (fixP->fx_subsy);
2200 fixP->fx_offset = add_number;
2201 fixP->fx_subsy = NULL;
2202 }
2203 else if (sub_symbol_segment == this_segment
2204 && !TC_FORCE_RELOCATION_SUB_LOCAL (fixP))
2205 {
2206 add_number -= S_GET_VALUE (fixP->fx_subsy);
2207 fixP->fx_offset = (add_number + fixP->fx_dot_value
2208 + fixP->fx_frag->fr_address);
2209
2210 /* Make it pc-relative. If the back-end code has not
2211 selected a pc-relative reloc, cancel the adjustment
2212 we do later on all pc-relative relocs. */
2213 if (0
2214 #ifdef TC_M68K
2215 /* Do this for m68k even if it's already described
2216 as pc-relative. On the m68k, an operand of
2217 "pc@(foo-.-2)" should address "foo" in a
2218 pc-relative mode. */
2219 || 1
2220 #endif
2221 || !fixP->fx_pcrel)
2222 add_number += MD_PCREL_FROM_SECTION (fixP, this_segment);
2223 fixP->fx_subsy = NULL;
2224 fixP->fx_pcrel = 1;
2225 }
2226 else if (!TC_VALIDATE_FIX_SUB (fixP))
2227 {
2228 as_bad_where (fixP->fx_file, fixP->fx_line,
2229 _("can't resolve `%s' {%s section} - `%s' {%s section}"),
2230 fixP->fx_addsy ? S_GET_NAME (fixP->fx_addsy) : "0",
2231 segment_name (add_symbol_segment),
2232 S_GET_NAME (fixP->fx_subsy),
2233 segment_name (sub_symbol_segment));
2234 }
2235 }
2236
2237 if (fixP->fx_addsy)
2238 {
2239 if (add_symbol_segment == this_segment
2240 && !TC_FORCE_RELOCATION_LOCAL (fixP))
2241 {
2242 /* This fixup was made when the symbol's segment was
2243 SEG_UNKNOWN, but it is now in the local segment.
2244 So we know how to do the address without relocation. */
2245 add_number += S_GET_VALUE (fixP->fx_addsy);
2246 fixP->fx_offset = add_number;
2247 if (fixP->fx_pcrel)
2248 add_number -= MD_PCREL_FROM_SECTION (fixP, this_segment);
2249 fixP->fx_addsy = NULL;
2250 fixP->fx_pcrel = 0;
2251 }
2252 else if (add_symbol_segment == absolute_section
2253 && !TC_FORCE_RELOCATION_ABS (fixP))
2254 {
2255 add_number += S_GET_VALUE (fixP->fx_addsy);
2256 fixP->fx_offset = add_number;
2257 fixP->fx_addsy = NULL;
2258 }
2259 else if (add_symbol_segment != undefined_section
2260 && ! bfd_is_com_section (add_symbol_segment)
2261 && MD_APPLY_SYM_VALUE (fixP))
2262 add_number += S_GET_VALUE (fixP->fx_addsy);
2263 }
2264
2265 if (fixP->fx_pcrel)
2266 {
2267 add_number -= MD_PCREL_FROM_SECTION (fixP, this_segment);
2268 if (!fixP->fx_done && fixP->fx_addsy == NULL)
2269 {
2270 /* There was no symbol required by this relocation.
2271 However, BFD doesn't really handle relocations
2272 without symbols well. So fake up a local symbol in
2273 the absolute section. */
2274 fixP->fx_addsy = abs_section_sym;
2275 }
2276 }
2277
2278 if (!fixP->fx_done)
2279 md_apply_fix (fixP, &add_number, this_segment);
2280
2281 if (!fixP->fx_done)
2282 {
2283 ++seg_reloc_count;
2284 if (fixP->fx_addsy == NULL)
2285 fixP->fx_addsy = abs_section_sym;
2286 symbol_mark_used_in_reloc (fixP->fx_addsy);
2287 if (fixP->fx_subsy != NULL)
2288 symbol_mark_used_in_reloc (fixP->fx_subsy);
2289 }
2290
2291 if (!fixP->fx_bit_fixP && !fixP->fx_no_overflow && fixP->fx_size != 0)
2292 {
2293 if (fixP->fx_size < sizeof (valueT))
2294 {
2295 valueT mask;
2296
2297 mask = 0;
2298 mask--; /* Set all bits to one. */
2299 mask <<= fixP->fx_size * 8 - (fixP->fx_signed ? 1 : 0);
2300 if ((add_number & mask) != 0 && (add_number & mask) != mask)
2301 {
2302 char buf[50], buf2[50];
2303 sprint_value (buf, fragP->fr_address + fixP->fx_where);
2304 if (add_number > 1000)
2305 sprint_value (buf2, add_number);
2306 else
2307 sprintf (buf2, "%ld", (long) add_number);
2308 as_bad_where (fixP->fx_file, fixP->fx_line,
2309 _("value of %s too large for field of %d bytes at %s"),
2310 buf2, fixP->fx_size, buf);
2311 } /* Generic error checking. */
2312 }
2313 #ifdef WARN_SIGNED_OVERFLOW_WORD
2314 /* Warn if a .word value is too large when treated as a signed
2315 number. We already know it is not too negative. This is to
2316 catch over-large switches generated by gcc on the 68k. */
2317 if (!flag_signed_overflow_ok
2318 && fixP->fx_size == 2
2319 && add_number > 0x7fff)
2320 as_bad_where (fixP->fx_file, fixP->fx_line,
2321 _("signed .word overflow; switch may be too large; %ld at 0x%lx"),
2322 (long) add_number,
2323 (long) (fragP->fr_address + fixP->fx_where));
2324 #endif
2325 } /* Not a bit fix. */
2326
2327 #ifdef TC_VALIDATE_FIX
2328 skip: ATTRIBUTE_UNUSED_LABEL
2329 ;
2330 #endif
2331 #ifdef DEBUG5
2332 fprintf (stderr, "result:\n");
2333 print_fixup (fixP);
2334 #endif
2335 } /* For each fixS in this segment. */
2336
2337 TC_ADJUST_RELOC_COUNT (fixP, seg_reloc_count);
2338 return seg_reloc_count;
2339 }
2340
2341 void
2342 number_to_chars_bigendian (char *buf, valueT val, int n)
2343 {
2344 if (n <= 0)
2345 abort ();
2346 while (n--)
2347 {
2348 buf[n] = val & 0xff;
2349 val >>= 8;
2350 }
2351 }
2352
2353 void
2354 number_to_chars_littleendian (char *buf, valueT val, int n)
2355 {
2356 if (n <= 0)
2357 abort ();
2358 while (n--)
2359 {
2360 *buf++ = val & 0xff;
2361 val >>= 8;
2362 }
2363 }
2364
2365 void
2366 write_print_statistics (FILE *file)
2367 {
2368 fprintf (file, "fixups: %d\n", n_fixups);
2369 }
2370
2371 /* For debugging. */
2372 extern int indent_level;
2373
2374 void
2375 print_fixup (fixS *fixp)
2376 {
2377 indent_level = 1;
2378 fprintf (stderr, "fix %lx %s:%d", (long) fixp, fixp->fx_file, fixp->fx_line);
2379 if (fixp->fx_pcrel)
2380 fprintf (stderr, " pcrel");
2381 if (fixp->fx_pcrel_adjust)
2382 fprintf (stderr, " pcrel_adjust=%d", fixp->fx_pcrel_adjust);
2383 if (fixp->fx_im_disp)
2384 {
2385 #ifdef TC_NS32K
2386 fprintf (stderr, " im_disp=%d", fixp->fx_im_disp);
2387 #else
2388 fprintf (stderr, " im_disp");
2389 #endif
2390 }
2391 if (fixp->fx_tcbit)
2392 fprintf (stderr, " tcbit");
2393 if (fixp->fx_done)
2394 fprintf (stderr, " done");
2395 fprintf (stderr, "\n size=%d frag=%lx where=%ld offset=%lx addnumber=%lx",
2396 fixp->fx_size, (long) fixp->fx_frag, (long) fixp->fx_where,
2397 (long) fixp->fx_offset, (long) fixp->fx_addnumber);
2398 fprintf (stderr, "\n %s (%d)", bfd_get_reloc_code_name (fixp->fx_r_type),
2399 fixp->fx_r_type);
2400 if (fixp->fx_addsy)
2401 {
2402 fprintf (stderr, "\n +<");
2403 print_symbol_value_1 (stderr, fixp->fx_addsy);
2404 fprintf (stderr, ">");
2405 }
2406 if (fixp->fx_subsy)
2407 {
2408 fprintf (stderr, "\n -<");
2409 print_symbol_value_1 (stderr, fixp->fx_subsy);
2410 fprintf (stderr, ">");
2411 }
2412 fprintf (stderr, "\n");
2413 #ifdef TC_FIX_DATA_PRINT
2414 TC_FIX_DATA_PRINT (stderr, fixp);
2415 #endif
2416 }