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