* gas/bfin/flow2.d: Match changed assembler behaviour.
[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 || S_IS_WEAKREFR (sym))
683 {
684 symbolS *new_sym
685 = symbol_get_value_expression (sym)->X_add_symbol;
686 const char *name = S_GET_NAME (sym);
687 if (!S_IS_COMMON (new_sym)
688 && !TC_FAKE_LABEL (name)
689 && !S_IS_WEAKREFR (sym)
690 && (!S_IS_EXTERNAL (sym) || S_IS_LOCAL (sym)))
691 as_bad (_("Local symbol `%s' can't be equated to undefined symbol `%s'"),
692 name, S_GET_NAME (new_sym));
693 fixp->fx_offset += symbol_get_value_expression (sym)->X_add_number;
694 sym = new_sym;
695 fixp->fx_addsy = sym;
696 }
697
698 if (symbol_mri_common_p (sym))
699 {
700 /* These symbols are handled specially in fixup_segment. */
701 continue;
702 }
703
704 /* If the symbol is undefined, common, weak, or global (ELF
705 shared libs), we can't replace it with the section symbol. */
706 if (S_FORCE_RELOC (fixp->fx_addsy, 1))
707 continue;
708
709 /* Is there some other (target cpu dependent) reason we can't adjust
710 this one? (E.g. relocations involving function addresses on
711 the PA. */
712 #ifdef tc_fix_adjustable
713 if (! tc_fix_adjustable (fixp))
714 continue;
715 #endif
716
717 /* Since we're reducing to section symbols, don't attempt to reduce
718 anything that's already using one. */
719 if (symbol_section_p (sym))
720 continue;
721
722 symsec = S_GET_SEGMENT (sym);
723 if (symsec == NULL)
724 abort ();
725
726 if (bfd_is_abs_section (symsec))
727 {
728 /* The fixup_segment routine normally will not use this
729 symbol in a relocation. */
730 continue;
731 }
732
733 /* Don't try to reduce relocs which refer to non-local symbols
734 in .linkonce sections. It can lead to confusion when a
735 debugging section refers to a .linkonce section. I hope
736 this will always be correct. */
737 if (symsec != sec && ! S_IS_LOCAL (sym))
738 {
739 if ((symsec->flags & SEC_LINK_ONCE) != 0
740 || (IS_ELF
741 /* The GNU toolchain uses an extension for ELF: a
742 section beginning with the magic string
743 .gnu.linkonce is a linkonce section. */
744 && strncmp (segment_name (symsec), ".gnu.linkonce",
745 sizeof ".gnu.linkonce" - 1) == 0))
746 continue;
747 }
748
749 /* Never adjust a reloc against local symbol in a merge section
750 with non-zero addend. */
751 if ((symsec->flags & SEC_MERGE) != 0
752 && (fixp->fx_offset != 0 || fixp->fx_subsy != NULL))
753 continue;
754
755 /* Never adjust a reloc against TLS local symbol. */
756 if ((symsec->flags & SEC_THREAD_LOCAL) != 0)
757 continue;
758
759 /* We refetch the segment when calling section_symbol, rather
760 than using symsec, because S_GET_VALUE may wind up changing
761 the section when it calls resolve_symbol_value. */
762 fixp->fx_offset += S_GET_VALUE (sym);
763 fixp->fx_addsy = section_symbol (S_GET_SEGMENT (sym));
764 #ifdef DEBUG5
765 fprintf (stderr, "\nadjusted fixup:\n");
766 print_fixup (fixp);
767 #endif
768 }
769
770 dump_section_relocs (abfd, sec, stderr);
771 }
772
773 static void
774 fix_segment (bfd *abfd ATTRIBUTE_UNUSED,
775 asection *sec,
776 PTR xxx ATTRIBUTE_UNUSED)
777 {
778 segment_info_type *seginfo = seg_info (sec);
779
780 fixup_segment (seginfo->fix_root, sec);
781 }
782
783 static void
784 write_relocs (bfd *abfd, asection *sec, PTR xxx ATTRIBUTE_UNUSED)
785 {
786 segment_info_type *seginfo = seg_info (sec);
787 unsigned int i;
788 unsigned int n;
789 arelent **relocs;
790 fixS *fixp;
791 char *err;
792
793 /* If seginfo is NULL, we did not create this section; don't do
794 anything with it. */
795 if (seginfo == NULL)
796 return;
797
798 n = 0;
799 for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next)
800 n++;
801
802 #ifndef RELOC_EXPANSION_POSSIBLE
803 /* Set up reloc information as well. */
804 relocs = (arelent **) xcalloc (n, sizeof (arelent *));
805
806 i = 0;
807 for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next)
808 {
809 arelent *reloc;
810 bfd_reloc_status_type s;
811 symbolS *sym;
812
813 if (fixp->fx_done)
814 {
815 n--;
816 continue;
817 }
818
819 /* If this is an undefined symbol which was equated to another
820 symbol, then generate the reloc against the latter symbol
821 rather than the former. */
822 sym = fixp->fx_addsy;
823 while (symbol_equated_reloc_p (sym))
824 {
825 symbolS *n;
826
827 /* We must avoid looping, as that can occur with a badly
828 written program. */
829 n = symbol_get_value_expression (sym)->X_add_symbol;
830 if (n == sym)
831 break;
832 fixp->fx_offset += symbol_get_value_expression (sym)->X_add_number;
833 sym = n;
834 }
835 fixp->fx_addsy = sym;
836
837 reloc = tc_gen_reloc (sec, fixp);
838 if (!reloc)
839 {
840 n--;
841 continue;
842 }
843
844 /*
845 This test is triggered inappropriately for the SH:
846 if (fixp->fx_where + fixp->fx_size
847 > fixp->fx_frag->fr_fix + fixp->fx_frag->fr_offset)
848 abort ();
849 */
850
851 s = bfd_install_relocation (stdoutput, reloc,
852 fixp->fx_frag->fr_literal,
853 fixp->fx_frag->fr_address,
854 sec, &err);
855 switch (s)
856 {
857 case bfd_reloc_ok:
858 break;
859 case bfd_reloc_overflow:
860 as_bad_where (fixp->fx_file, fixp->fx_line,
861 _("relocation overflow"));
862 break;
863 case bfd_reloc_outofrange:
864 as_bad_where (fixp->fx_file, fixp->fx_line,
865 _("relocation out of range"));
866 break;
867 default:
868 as_fatal (_("%s:%u: bad return from bfd_install_relocation: %x"),
869 fixp->fx_file, fixp->fx_line, s);
870 }
871 relocs[i++] = reloc;
872 }
873 #else
874 n = n * MAX_RELOC_EXPANSION;
875 /* Set up reloc information as well. */
876 relocs = (arelent **) xcalloc (n, sizeof (arelent *));
877
878 i = 0;
879 for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next)
880 {
881 arelent **reloc;
882 bfd_reloc_status_type s;
883 symbolS *sym;
884 int j;
885
886 if (fixp->fx_done)
887 {
888 n--;
889 continue;
890 }
891
892 /* If this is an undefined symbol which was equated to another
893 symbol, then generate the reloc against the latter symbol
894 rather than the former. */
895 sym = fixp->fx_addsy;
896 while (symbol_equated_reloc_p (sym))
897 {
898 symbolS *n;
899
900 /* We must avoid looping, as that can occur with a badly
901 written program. */
902 n = symbol_get_value_expression (sym)->X_add_symbol;
903 if (n == sym)
904 break;
905 fixp->fx_offset += symbol_get_value_expression (sym)->X_add_number;
906 sym = n;
907 }
908 fixp->fx_addsy = sym;
909
910 reloc = tc_gen_reloc (sec, fixp);
911
912 for (j = 0; reloc[j]; j++)
913 {
914 relocs[i++] = reloc[j];
915 assert (i <= n);
916 }
917 if (fixp->fx_where + fixp->fx_size
918 > fixp->fx_frag->fr_fix + fixp->fx_frag->fr_offset)
919 as_bad_where (fixp->fx_file, fixp->fx_line,
920 _("internal error: fixup not contained within frag"));
921 for (j = 0; reloc[j]; j++)
922 {
923 s = bfd_install_relocation (stdoutput, reloc[j],
924 fixp->fx_frag->fr_literal,
925 fixp->fx_frag->fr_address,
926 sec, &err);
927 switch (s)
928 {
929 case bfd_reloc_ok:
930 break;
931 case bfd_reloc_overflow:
932 as_bad_where (fixp->fx_file, fixp->fx_line,
933 _("relocation overflow"));
934 break;
935 case bfd_reloc_outofrange:
936 as_bad_where (fixp->fx_file, fixp->fx_line,
937 _("relocation out of range"));
938 break;
939 default:
940 as_fatal (_("%s:%u: bad return from bfd_install_relocation: %x"),
941 fixp->fx_file, fixp->fx_line, s);
942 }
943 }
944 }
945 n = i;
946 #endif
947
948 #ifdef DEBUG4
949 {
950 unsigned int i, j, nsyms;
951 asymbol **sympp;
952 sympp = bfd_get_outsymbols (stdoutput);
953 nsyms = bfd_get_symcount (stdoutput);
954 for (i = 0; i < n; i++)
955 if (((*relocs[i]->sym_ptr_ptr)->flags & BSF_SECTION_SYM) == 0)
956 {
957 for (j = 0; j < nsyms; j++)
958 if (sympp[j] == *relocs[i]->sym_ptr_ptr)
959 break;
960 if (j == nsyms)
961 abort ();
962 }
963 }
964 #endif
965
966 if (n)
967 bfd_set_reloc (stdoutput, sec, relocs, n);
968 else
969 bfd_set_section_flags (abfd, sec,
970 (bfd_get_section_flags (abfd, sec)
971 & (flagword) ~SEC_RELOC));
972
973 #ifdef SET_SECTION_RELOCS
974 SET_SECTION_RELOCS (sec, relocs, n);
975 #endif
976
977 #ifdef DEBUG3
978 {
979 unsigned int i;
980 arelent *r;
981 asymbol *s;
982 fprintf (stderr, "relocs for sec %s\n", sec->name);
983 for (i = 0; i < n; i++)
984 {
985 r = relocs[i];
986 s = *r->sym_ptr_ptr;
987 fprintf (stderr, " reloc %2d @%p off %4lx : sym %-10s addend %lx\n",
988 i, r, (unsigned long)r->address, s->name, (unsigned long)r->addend);
989 }
990 }
991 #endif
992 }
993
994 static void
995 write_contents (bfd *abfd ATTRIBUTE_UNUSED,
996 asection *sec,
997 PTR xxx ATTRIBUTE_UNUSED)
998 {
999 segment_info_type *seginfo = seg_info (sec);
1000 addressT offset = 0;
1001 fragS *f;
1002
1003 /* Write out the frags. */
1004 if (seginfo == NULL
1005 || !(bfd_get_section_flags (abfd, sec) & SEC_HAS_CONTENTS))
1006 return;
1007
1008 for (f = seginfo->frchainP->frch_root;
1009 f;
1010 f = f->fr_next)
1011 {
1012 int x;
1013 addressT fill_size;
1014 char *fill_literal;
1015 offsetT count;
1016
1017 assert (f->fr_type == rs_fill);
1018 if (f->fr_fix)
1019 {
1020 x = bfd_set_section_contents (stdoutput, sec,
1021 f->fr_literal, (file_ptr) offset,
1022 (bfd_size_type) f->fr_fix);
1023 if (!x)
1024 {
1025 bfd_perror (stdoutput->filename);
1026 as_perror (_("FATAL: Can't write %s"), stdoutput->filename);
1027 exit (EXIT_FAILURE);
1028 }
1029 offset += f->fr_fix;
1030 }
1031 fill_literal = f->fr_literal + f->fr_fix;
1032 fill_size = f->fr_var;
1033 count = f->fr_offset;
1034 assert (count >= 0);
1035 if (fill_size && count)
1036 {
1037 char buf[256];
1038 if (fill_size > sizeof (buf))
1039 {
1040 /* Do it the old way. Can this ever happen? */
1041 while (count--)
1042 {
1043 x = bfd_set_section_contents (stdoutput, sec,
1044 fill_literal,
1045 (file_ptr) offset,
1046 (bfd_size_type) fill_size);
1047 if (!x)
1048 {
1049 bfd_perror (stdoutput->filename);
1050 as_perror (_("FATAL: Can't write %s"),
1051 stdoutput->filename);
1052 exit (EXIT_FAILURE);
1053 }
1054 offset += fill_size;
1055 }
1056 }
1057 else
1058 {
1059 /* Build a buffer full of fill objects and output it as
1060 often as necessary. This saves on the overhead of
1061 potentially lots of bfd_set_section_contents calls. */
1062 int n_per_buf, i;
1063 if (fill_size == 1)
1064 {
1065 n_per_buf = sizeof (buf);
1066 memset (buf, *fill_literal, n_per_buf);
1067 }
1068 else
1069 {
1070 char *bufp;
1071 n_per_buf = sizeof (buf) / fill_size;
1072 for (i = n_per_buf, bufp = buf; i; i--, bufp += fill_size)
1073 memcpy (bufp, fill_literal, fill_size);
1074 }
1075 for (; count > 0; count -= n_per_buf)
1076 {
1077 n_per_buf = n_per_buf > count ? count : n_per_buf;
1078 x = bfd_set_section_contents
1079 (stdoutput, sec, buf, (file_ptr) offset,
1080 (bfd_size_type) n_per_buf * fill_size);
1081 if (!x)
1082 as_fatal (_("cannot write to output file"));
1083 offset += n_per_buf * fill_size;
1084 }
1085 }
1086 }
1087 }
1088 }
1089
1090 static void
1091 merge_data_into_text (void)
1092 {
1093 seg_info (text_section)->frchainP->frch_last->fr_next =
1094 seg_info (data_section)->frchainP->frch_root;
1095 seg_info (text_section)->frchainP->frch_last =
1096 seg_info (data_section)->frchainP->frch_last;
1097 seg_info (data_section)->frchainP = 0;
1098 }
1099
1100 static void
1101 set_symtab (void)
1102 {
1103 int nsyms;
1104 asymbol **asympp;
1105 symbolS *symp;
1106 bfd_boolean result;
1107 extern PTR bfd_alloc (bfd *, bfd_size_type);
1108
1109 /* Count symbols. We can't rely on a count made by the loop in
1110 write_object_file, because *_frob_file may add a new symbol or
1111 two. */
1112 nsyms = 0;
1113 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
1114 nsyms++;
1115
1116 if (nsyms)
1117 {
1118 int i;
1119 bfd_size_type amt = (bfd_size_type) nsyms * sizeof (asymbol *);
1120
1121 asympp = (asymbol **) bfd_alloc (stdoutput, amt);
1122 symp = symbol_rootP;
1123 for (i = 0; i < nsyms; i++, symp = symbol_next (symp))
1124 {
1125 asympp[i] = symbol_get_bfdsym (symp);
1126 symbol_mark_written (symp);
1127 }
1128 }
1129 else
1130 asympp = 0;
1131 result = bfd_set_symtab (stdoutput, asympp, nsyms);
1132 assert (result);
1133 symbol_table_frozen = 1;
1134 }
1135
1136 /* Finish the subsegments. After every sub-segment, we fake an
1137 ".align ...". This conforms to BSD4.2 brane-damage. We then fake
1138 ".fill 0" because that is the kind of frag that requires least
1139 thought. ".align" frags like to have a following frag since that
1140 makes calculating their intended length trivial. */
1141
1142 #ifndef SUB_SEGMENT_ALIGN
1143 #ifdef HANDLE_ALIGN
1144 /* The last subsegment gets an alignment corresponding to the alignment
1145 of the section. This allows proper nop-filling at the end of
1146 code-bearing sections. */
1147 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) \
1148 (!(FRCHAIN)->frch_next || (FRCHAIN)->frch_next->frch_seg != (SEG) \
1149 ? get_recorded_alignment (SEG) : 0)
1150 #else
1151 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) 0
1152 #endif
1153 #endif
1154
1155 void
1156 subsegs_finish (void)
1157 {
1158 struct frchain *frchainP;
1159
1160 for (frchainP = frchain_root; frchainP; frchainP = frchainP->frch_next)
1161 {
1162 int alignment = 0;
1163
1164 subseg_set (frchainP->frch_seg, frchainP->frch_subseg);
1165
1166 /* This now gets called even if we had errors. In that case,
1167 any alignment is meaningless, and, moreover, will look weird
1168 if we are generating a listing. */
1169 if (!had_errors ())
1170 {
1171 alignment = SUB_SEGMENT_ALIGN (now_seg, frchainP);
1172 if ((bfd_get_section_flags (now_seg->owner, now_seg) & SEC_MERGE)
1173 && now_seg->entsize)
1174 {
1175 unsigned int entsize = now_seg->entsize;
1176 int entalign = 0;
1177
1178 while ((entsize & 1) == 0)
1179 {
1180 ++entalign;
1181 entsize >>= 1;
1182 }
1183 if (entalign > alignment)
1184 alignment = entalign;
1185 }
1186 }
1187
1188 if (subseg_text_p (now_seg))
1189 frag_align_code (alignment, 0);
1190 else
1191 frag_align (alignment, 0, 0);
1192
1193 /* frag_align will have left a new frag.
1194 Use this last frag for an empty ".fill".
1195
1196 For this segment ...
1197 Create a last frag. Do not leave a "being filled in frag". */
1198 frag_wane (frag_now);
1199 frag_now->fr_fix = 0;
1200 know (frag_now->fr_next == NULL);
1201 }
1202 }
1203
1204 /* Write the object file. */
1205
1206 void
1207 write_object_file (void)
1208 {
1209 #ifndef WORKING_DOT_WORD
1210 fragS *fragP; /* Track along all frags. */
1211 #endif
1212
1213 /* Do we really want to write it? */
1214 {
1215 int n_warns, n_errs;
1216 n_warns = had_warnings ();
1217 n_errs = had_errors ();
1218 /* The -Z flag indicates that an object file should be generated,
1219 regardless of warnings and errors. */
1220 if (flag_always_generate_output)
1221 {
1222 if (n_warns || n_errs)
1223 as_warn (_("%d error%s, %d warning%s, generating bad object file"),
1224 n_errs, n_errs == 1 ? "" : "s",
1225 n_warns, n_warns == 1 ? "" : "s");
1226 }
1227 else
1228 {
1229 if (n_errs)
1230 as_fatal (_("%d error%s, %d warning%s, no object file generated"),
1231 n_errs, n_errs == 1 ? "" : "s",
1232 n_warns, n_warns == 1 ? "" : "s");
1233 }
1234 }
1235
1236 #ifdef OBJ_VMS
1237 /* Under VMS we try to be compatible with VAX-11 "C". Thus, we call
1238 a routine to check for the definition of the procedure "_main",
1239 and if so -- fix it up so that it can be program entry point. */
1240 vms_check_for_main ();
1241 #endif /* OBJ_VMS */
1242
1243 /* From now on, we don't care about sub-segments. Build one frag chain
1244 for each segment. Linked thru fr_next. */
1245
1246 /* Remove the sections created by gas for its own purposes. */
1247 {
1248 int i;
1249
1250 bfd_section_list_remove (stdoutput, reg_section);
1251 bfd_section_list_remove (stdoutput, expr_section);
1252 stdoutput->section_count -= 2;
1253 i = 0;
1254 bfd_map_over_sections (stdoutput, renumber_sections, &i);
1255 }
1256
1257 bfd_map_over_sections (stdoutput, chain_frchains_together, (char *) 0);
1258
1259 /* We have two segments. If user gave -R flag, then we must put the
1260 data frags into the text segment. Do this before relaxing so
1261 we know to take advantage of -R and make shorter addresses. */
1262 if (flag_readonly_data_in_text)
1263 {
1264 merge_data_into_text ();
1265 }
1266
1267 while (1)
1268 {
1269 int changed;
1270
1271 #ifndef WORKING_DOT_WORD
1272 /* We need to reset the markers in the broken word list and
1273 associated frags between calls to relax_segment (via
1274 relax_seg). Since the broken word list is global, we do it
1275 once per round, rather than locally in relax_segment for each
1276 segment. */
1277 struct broken_word *brokp;
1278
1279 for (brokp = broken_words;
1280 brokp != (struct broken_word *) NULL;
1281 brokp = brokp->next_broken_word)
1282 {
1283 brokp->added = 0;
1284
1285 if (brokp->dispfrag != (fragS *) NULL
1286 && brokp->dispfrag->fr_type == rs_broken_word)
1287 brokp->dispfrag->fr_subtype = 0;
1288 }
1289 #endif
1290
1291 changed = 0;
1292 bfd_map_over_sections (stdoutput, relax_seg, &changed);
1293 if (!changed)
1294 break;
1295 }
1296
1297 /* Note - Most ports will use the default value of
1298 TC_FINALIZE_SYMS_BEFORE_SIZE_SEG, which 1. This will force
1299 local symbols to be resolved, removing their frag information.
1300 Some ports however, will not have finished relaxing all of
1301 their frags and will still need the local symbol frag
1302 information. These ports can set
1303 TC_FINALIZE_SYMS_BEFORE_SIZE_SEG to 0. */
1304 finalize_syms = TC_FINALIZE_SYMS_BEFORE_SIZE_SEG;
1305
1306 bfd_map_over_sections (stdoutput, size_seg, (char *) 0);
1307
1308 /* Relaxation has completed. Freeze all syms. */
1309 finalize_syms = 1;
1310
1311 #ifdef md_post_relax_hook
1312 md_post_relax_hook;
1313 #endif
1314
1315 #ifndef WORKING_DOT_WORD
1316 {
1317 struct broken_word *lie;
1318 struct broken_word **prevP;
1319
1320 prevP = &broken_words;
1321 for (lie = broken_words; lie; lie = lie->next_broken_word)
1322 if (!lie->added)
1323 {
1324 expressionS exp;
1325
1326 subseg_change (lie->seg, lie->subseg);
1327 exp.X_op = O_subtract;
1328 exp.X_add_symbol = lie->add;
1329 exp.X_op_symbol = lie->sub;
1330 exp.X_add_number = lie->addnum;
1331 #ifdef TC_CONS_FIX_NEW
1332 TC_CONS_FIX_NEW (lie->frag,
1333 lie->word_goes_here - lie->frag->fr_literal,
1334 2, &exp);
1335 #else
1336 fix_new_exp (lie->frag,
1337 lie->word_goes_here - lie->frag->fr_literal,
1338 2, &exp, 0, BFD_RELOC_16);
1339 #endif
1340 *prevP = lie->next_broken_word;
1341 }
1342 else
1343 prevP = &(lie->next_broken_word);
1344
1345 for (lie = broken_words; lie;)
1346 {
1347 struct broken_word *untruth;
1348 char *table_ptr;
1349 addressT table_addr;
1350 addressT from_addr, to_addr;
1351 int n, m;
1352
1353 subseg_change (lie->seg, lie->subseg);
1354 fragP = lie->dispfrag;
1355
1356 /* Find out how many broken_words go here. */
1357 n = 0;
1358 for (untruth = lie;
1359 untruth && untruth->dispfrag == fragP;
1360 untruth = untruth->next_broken_word)
1361 if (untruth->added == 1)
1362 n++;
1363
1364 table_ptr = lie->dispfrag->fr_opcode;
1365 table_addr = (lie->dispfrag->fr_address
1366 + (table_ptr - lie->dispfrag->fr_literal));
1367 /* Create the jump around the long jumps. This is a short
1368 jump from table_ptr+0 to table_ptr+n*long_jump_size. */
1369 from_addr = table_addr;
1370 to_addr = table_addr + md_short_jump_size + n * md_long_jump_size;
1371 md_create_short_jump (table_ptr, from_addr, to_addr, lie->dispfrag,
1372 lie->add);
1373 table_ptr += md_short_jump_size;
1374 table_addr += md_short_jump_size;
1375
1376 for (m = 0;
1377 lie && lie->dispfrag == fragP;
1378 m++, lie = lie->next_broken_word)
1379 {
1380 if (lie->added == 2)
1381 continue;
1382 /* Patch the jump table. */
1383 /* This is the offset from ??? to table_ptr+0. */
1384 to_addr = table_addr - S_GET_VALUE (lie->sub);
1385 #ifdef TC_CHECK_ADJUSTED_BROKEN_DOT_WORD
1386 TC_CHECK_ADJUSTED_BROKEN_DOT_WORD (to_addr, lie);
1387 #endif
1388 md_number_to_chars (lie->word_goes_here, to_addr, 2);
1389 for (untruth = lie->next_broken_word;
1390 untruth && untruth->dispfrag == fragP;
1391 untruth = untruth->next_broken_word)
1392 {
1393 if (untruth->use_jump == lie)
1394 md_number_to_chars (untruth->word_goes_here, to_addr, 2);
1395 }
1396
1397 /* Install the long jump. */
1398 /* This is a long jump from table_ptr+0 to the final target. */
1399 from_addr = table_addr;
1400 to_addr = S_GET_VALUE (lie->add) + lie->addnum;
1401 md_create_long_jump (table_ptr, from_addr, to_addr, lie->dispfrag,
1402 lie->add);
1403 table_ptr += md_long_jump_size;
1404 table_addr += md_long_jump_size;
1405 }
1406 }
1407 }
1408 #endif /* not WORKING_DOT_WORD */
1409
1410 /* Resolve symbol values. This needs to be done before processing
1411 the relocations. */
1412 if (symbol_rootP)
1413 {
1414 symbolS *symp;
1415
1416 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
1417 resolve_symbol_value (symp);
1418 }
1419 resolve_local_symbol_values ();
1420
1421 PROGRESS (1);
1422
1423 #ifdef tc_frob_file_before_adjust
1424 tc_frob_file_before_adjust ();
1425 #endif
1426 #ifdef obj_frob_file_before_adjust
1427 obj_frob_file_before_adjust ();
1428 #endif
1429
1430 bfd_map_over_sections (stdoutput, adjust_reloc_syms, (char *) 0);
1431
1432 #ifdef tc_frob_file_before_fix
1433 tc_frob_file_before_fix ();
1434 #endif
1435 #ifdef obj_frob_file_before_fix
1436 obj_frob_file_before_fix ();
1437 #endif
1438
1439 bfd_map_over_sections (stdoutput, fix_segment, (char *) 0);
1440
1441 /* Set up symbol table, and write it out. */
1442 if (symbol_rootP)
1443 {
1444 symbolS *symp;
1445 bfd_boolean skip_next_symbol = FALSE;
1446
1447 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
1448 {
1449 int punt = 0;
1450 const char *name;
1451
1452 if (skip_next_symbol)
1453 {
1454 /* Don't do anything besides moving the value of the
1455 symbol from the GAS value-field to the BFD value-field. */
1456 symbol_get_bfdsym (symp)->value = S_GET_VALUE (symp);
1457 skip_next_symbol = FALSE;
1458 continue;
1459 }
1460
1461 if (symbol_mri_common_p (symp))
1462 {
1463 if (S_IS_EXTERNAL (symp))
1464 as_bad (_("%s: global symbols not supported in common sections"),
1465 S_GET_NAME (symp));
1466 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
1467 continue;
1468 }
1469
1470 name = S_GET_NAME (symp);
1471 if (name)
1472 {
1473 const char *name2 =
1474 decode_local_label_name ((char *) S_GET_NAME (symp));
1475 /* They only differ if `name' is a fb or dollar local
1476 label name. */
1477 if (name2 != name && ! S_IS_DEFINED (symp))
1478 as_bad (_("local label `%s' is not defined"), name2);
1479 }
1480
1481 /* Do it again, because adjust_reloc_syms might introduce
1482 more symbols. They'll probably only be section symbols,
1483 but they'll still need to have the values computed. */
1484 resolve_symbol_value (symp);
1485
1486 /* Skip symbols which were equated to undefined or common
1487 symbols. */
1488 if (symbol_equated_reloc_p (symp)
1489 || S_IS_WEAKREFR (symp))
1490 {
1491 const char *name = S_GET_NAME (symp);
1492 if (S_IS_COMMON (symp)
1493 && !TC_FAKE_LABEL (name)
1494 && !S_IS_WEAKREFR (symp)
1495 && (!S_IS_EXTERNAL (symp) || S_IS_LOCAL (symp)))
1496 {
1497 expressionS *e = symbol_get_value_expression (symp);
1498 as_bad (_("Local symbol `%s' can't be equated to common symbol `%s'"),
1499 name, S_GET_NAME (e->X_add_symbol));
1500 }
1501 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
1502 continue;
1503 }
1504
1505 /* So far, common symbols have been treated like undefined symbols.
1506 Put them in the common section now. */
1507 if (S_IS_DEFINED (symp) == 0
1508 && S_GET_VALUE (symp) != 0)
1509 S_SET_SEGMENT (symp, bfd_com_section_ptr);
1510
1511 #ifdef obj_frob_symbol
1512 obj_frob_symbol (symp, punt);
1513 #endif
1514 #ifdef tc_frob_symbol
1515 if (! punt || symbol_used_in_reloc_p (symp))
1516 tc_frob_symbol (symp, punt);
1517 #endif
1518
1519 /* If we don't want to keep this symbol, splice it out of
1520 the chain now. If EMIT_SECTION_SYMBOLS is 0, we never
1521 want section symbols. Otherwise, we skip local symbols
1522 and symbols that the frob_symbol macros told us to punt,
1523 but we keep such symbols if they are used in relocs. */
1524 if (symp == abs_section_sym
1525 || (! EMIT_SECTION_SYMBOLS
1526 && symbol_section_p (symp))
1527 /* Note that S_IS_EXTERNAL and S_IS_LOCAL are not always
1528 opposites. Sometimes the former checks flags and the
1529 latter examines the name... */
1530 || (!S_IS_EXTERNAL (symp)
1531 && (punt || S_IS_LOCAL (symp) || S_IS_WEAKREFD (symp))
1532 && ! symbol_used_in_reloc_p (symp)))
1533 {
1534 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
1535
1536 /* After symbol_remove, symbol_next(symp) still returns
1537 the one that came after it in the chain. So we don't
1538 need to do any extra cleanup work here. */
1539 continue;
1540 }
1541
1542 /* Make sure we really got a value for the symbol. */
1543 if (! symbol_resolved_p (symp))
1544 {
1545 as_bad (_("can't resolve value for symbol `%s'"),
1546 S_GET_NAME (symp));
1547 symbol_mark_resolved (symp);
1548 }
1549
1550 /* Set the value into the BFD symbol. Up til now the value
1551 has only been kept in the gas symbolS struct. */
1552 symbol_get_bfdsym (symp)->value = S_GET_VALUE (symp);
1553
1554 /* A warning construct is a warning symbol followed by the
1555 symbol warned about. Don't let anything object-format or
1556 target-specific muck with it; it's ready for output. */
1557 if (symbol_get_bfdsym (symp)->flags & BSF_WARNING)
1558 skip_next_symbol = TRUE;
1559 }
1560 }
1561
1562 PROGRESS (1);
1563
1564 /* Now do any format-specific adjustments to the symbol table, such
1565 as adding file symbols. */
1566 #ifdef tc_adjust_symtab
1567 tc_adjust_symtab ();
1568 #endif
1569 #ifdef obj_adjust_symtab
1570 obj_adjust_symtab ();
1571 #endif
1572
1573 /* Now that all the sizes are known, and contents correct, we can
1574 start writing to the file. */
1575 set_symtab ();
1576
1577 /* If *_frob_file changes the symbol value at this point, it is
1578 responsible for moving the changed value into symp->bsym->value
1579 as well. Hopefully all symbol value changing can be done in
1580 *_frob_symbol. */
1581 #ifdef tc_frob_file
1582 tc_frob_file ();
1583 #endif
1584 #ifdef obj_frob_file
1585 obj_frob_file ();
1586 #endif
1587
1588 bfd_map_over_sections (stdoutput, write_relocs, (char *) 0);
1589
1590 #ifdef tc_frob_file_after_relocs
1591 tc_frob_file_after_relocs ();
1592 #endif
1593 #ifdef obj_frob_file_after_relocs
1594 obj_frob_file_after_relocs ();
1595 #endif
1596
1597 bfd_map_over_sections (stdoutput, write_contents, (char *) 0);
1598 }
1599
1600 #ifdef TC_GENERIC_RELAX_TABLE
1601 /* Relax a fragment by scanning TC_GENERIC_RELAX_TABLE. */
1602
1603 long
1604 relax_frag (segT segment, fragS *fragP, long stretch)
1605 {
1606 const relax_typeS *this_type;
1607 const relax_typeS *start_type;
1608 relax_substateT next_state;
1609 relax_substateT this_state;
1610 offsetT growth;
1611 offsetT aim;
1612 addressT target;
1613 addressT address;
1614 symbolS *symbolP;
1615 const relax_typeS *table;
1616
1617 target = fragP->fr_offset;
1618 address = fragP->fr_address;
1619 table = TC_GENERIC_RELAX_TABLE;
1620 this_state = fragP->fr_subtype;
1621 start_type = this_type = table + this_state;
1622 symbolP = fragP->fr_symbol;
1623
1624 if (symbolP)
1625 {
1626 fragS *sym_frag;
1627
1628 sym_frag = symbol_get_frag (symbolP);
1629
1630 #ifndef DIFF_EXPR_OK
1631 know (sym_frag != NULL);
1632 #endif
1633 know (S_GET_SEGMENT (symbolP) != absolute_section
1634 || sym_frag == &zero_address_frag);
1635 target += S_GET_VALUE (symbolP);
1636
1637 /* If frag has yet to be reached on this pass,
1638 assume it will move by STRETCH just as we did.
1639 If this is not so, it will be because some frag
1640 between grows, and that will force another pass. */
1641
1642 if (stretch != 0
1643 && sym_frag->relax_marker != fragP->relax_marker
1644 && S_GET_SEGMENT (symbolP) == segment)
1645 {
1646 target += stretch;
1647 }
1648 }
1649
1650 aim = target - address - fragP->fr_fix;
1651 #ifdef TC_PCREL_ADJUST
1652 /* Currently only the ns32k family needs this. */
1653 aim += TC_PCREL_ADJUST (fragP);
1654 #endif
1655
1656 #ifdef md_prepare_relax_scan
1657 /* Formerly called M68K_AIM_KLUDGE. */
1658 md_prepare_relax_scan (fragP, address, aim, this_state, this_type);
1659 #endif
1660
1661 if (aim < 0)
1662 {
1663 /* Look backwards. */
1664 for (next_state = this_type->rlx_more; next_state;)
1665 if (aim >= this_type->rlx_backward)
1666 next_state = 0;
1667 else
1668 {
1669 /* Grow to next state. */
1670 this_state = next_state;
1671 this_type = table + this_state;
1672 next_state = this_type->rlx_more;
1673 }
1674 }
1675 else
1676 {
1677 /* Look forwards. */
1678 for (next_state = this_type->rlx_more; next_state;)
1679 if (aim <= this_type->rlx_forward)
1680 next_state = 0;
1681 else
1682 {
1683 /* Grow to next state. */
1684 this_state = next_state;
1685 this_type = table + this_state;
1686 next_state = this_type->rlx_more;
1687 }
1688 }
1689
1690 growth = this_type->rlx_length - start_type->rlx_length;
1691 if (growth != 0)
1692 fragP->fr_subtype = this_state;
1693 return growth;
1694 }
1695
1696 #endif /* defined (TC_GENERIC_RELAX_TABLE) */
1697
1698 /* Relax_align. Advance location counter to next address that has 'alignment'
1699 lowest order bits all 0s, return size of adjustment made. */
1700 static relax_addressT
1701 relax_align (register relax_addressT address, /* Address now. */
1702 register int alignment /* Alignment (binary). */)
1703 {
1704 relax_addressT mask;
1705 relax_addressT new_address;
1706
1707 mask = ~((~0) << alignment);
1708 new_address = (address + mask) & (~mask);
1709 #ifdef LINKER_RELAXING_SHRINKS_ONLY
1710 if (linkrelax)
1711 /* We must provide lots of padding, so the linker can discard it
1712 when needed. The linker will not add extra space, ever. */
1713 new_address += (1 << alignment);
1714 #endif
1715 return (new_address - address);
1716 }
1717
1718 /* Now we have a segment, not a crowd of sub-segments, we can make
1719 fr_address values.
1720
1721 Relax the frags.
1722
1723 After this, all frags in this segment have addresses that are correct
1724 within the segment. Since segments live in different file addresses,
1725 these frag addresses may not be the same as final object-file
1726 addresses. */
1727
1728 int
1729 relax_segment (struct frag *segment_frag_root, segT segment)
1730 {
1731 unsigned long frag_count;
1732 struct frag *fragP;
1733 relax_addressT address;
1734 int ret;
1735
1736 /* In case md_estimate_size_before_relax() wants to make fixSs. */
1737 subseg_change (segment, 0);
1738
1739 /* For each frag in segment: count and store (a 1st guess of)
1740 fr_address. */
1741 address = 0;
1742 for (frag_count = 0, fragP = segment_frag_root;
1743 fragP;
1744 fragP = fragP->fr_next, frag_count ++)
1745 {
1746 fragP->relax_marker = 0;
1747 fragP->fr_address = address;
1748 address += fragP->fr_fix;
1749
1750 switch (fragP->fr_type)
1751 {
1752 case rs_fill:
1753 address += fragP->fr_offset * fragP->fr_var;
1754 break;
1755
1756 case rs_align:
1757 case rs_align_code:
1758 case rs_align_test:
1759 {
1760 addressT offset = relax_align (address, (int) fragP->fr_offset);
1761
1762 if (fragP->fr_subtype != 0 && offset > fragP->fr_subtype)
1763 offset = 0;
1764
1765 if (offset % fragP->fr_var != 0)
1766 {
1767 as_bad_where (fragP->fr_file, fragP->fr_line,
1768 _("alignment padding (%lu bytes) not a multiple of %ld"),
1769 (unsigned long) offset, (long) fragP->fr_var);
1770 offset -= (offset % fragP->fr_var);
1771 }
1772
1773 address += offset;
1774 }
1775 break;
1776
1777 case rs_org:
1778 case rs_space:
1779 /* Assume .org is nugatory. It will grow with 1st relax. */
1780 break;
1781
1782 case rs_machine_dependent:
1783 /* If fr_symbol is an expression, this call to
1784 resolve_symbol_value sets up the correct segment, which will
1785 likely be needed in md_estimate_size_before_relax. */
1786 if (fragP->fr_symbol)
1787 resolve_symbol_value (fragP->fr_symbol);
1788
1789 address += md_estimate_size_before_relax (fragP, segment);
1790 break;
1791
1792 #ifndef WORKING_DOT_WORD
1793 /* Broken words don't concern us yet. */
1794 case rs_broken_word:
1795 break;
1796 #endif
1797
1798 case rs_leb128:
1799 /* Initial guess is always 1; doing otherwise can result in
1800 stable solutions that are larger than the minimum. */
1801 address += fragP->fr_offset = 1;
1802 break;
1803
1804 case rs_cfa:
1805 address += eh_frame_estimate_size_before_relax (fragP);
1806 break;
1807
1808 case rs_dwarf2dbg:
1809 address += dwarf2dbg_estimate_size_before_relax (fragP);
1810 break;
1811
1812 default:
1813 BAD_CASE (fragP->fr_type);
1814 break;
1815 }
1816 }
1817
1818 /* Do relax(). */
1819 {
1820 unsigned long max_iterations;
1821 offsetT stretch; /* May be any size, 0 or negative. */
1822 /* Cumulative number of addresses we have relaxed this pass.
1823 We may have relaxed more than one address. */
1824 int stretched; /* Have we stretched on this pass? */
1825 /* This is 'cuz stretch may be zero, when, in fact some piece of code
1826 grew, and another shrank. If a branch instruction doesn't fit anymore,
1827 we could be scrod. */
1828
1829 /* We want to prevent going into an infinite loop where one frag grows
1830 depending upon the location of a symbol which is in turn moved by
1831 the growing frag. eg:
1832
1833 foo = .
1834 .org foo+16
1835 foo = .
1836
1837 So we dictate that this algorithm can be at most O2. */
1838 max_iterations = frag_count * frag_count;
1839 /* Check for overflow. */
1840 if (max_iterations < frag_count)
1841 max_iterations = frag_count;
1842
1843 do
1844 {
1845 stretch = 0;
1846 stretched = 0;
1847
1848 for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next)
1849 {
1850 offsetT growth = 0;
1851 addressT was_address;
1852 offsetT offset;
1853 symbolS *symbolP;
1854
1855 fragP->relax_marker ^= 1;
1856 was_address = fragP->fr_address;
1857 address = fragP->fr_address += stretch;
1858 symbolP = fragP->fr_symbol;
1859 offset = fragP->fr_offset;
1860
1861 switch (fragP->fr_type)
1862 {
1863 case rs_fill: /* .fill never relaxes. */
1864 growth = 0;
1865 break;
1866
1867 #ifndef WORKING_DOT_WORD
1868 /* JF: This is RMS's idea. I do *NOT* want to be blamed
1869 for it I do not want to write it. I do not want to have
1870 anything to do with it. This is not the proper way to
1871 implement this misfeature. */
1872 case rs_broken_word:
1873 {
1874 struct broken_word *lie;
1875 struct broken_word *untruth;
1876
1877 /* Yes this is ugly (storing the broken_word pointer
1878 in the symbol slot). Still, this whole chunk of
1879 code is ugly, and I don't feel like doing anything
1880 about it. Think of it as stubbornness in action. */
1881 growth = 0;
1882 for (lie = (struct broken_word *) (fragP->fr_symbol);
1883 lie && lie->dispfrag == fragP;
1884 lie = lie->next_broken_word)
1885 {
1886
1887 if (lie->added)
1888 continue;
1889
1890 offset = (S_GET_VALUE (lie->add)
1891 + lie->addnum
1892 - S_GET_VALUE (lie->sub));
1893 if (offset <= -32768 || offset >= 32767)
1894 {
1895 if (flag_warn_displacement)
1896 {
1897 char buf[50];
1898 sprint_value (buf, (addressT) lie->addnum);
1899 as_warn_where (fragP->fr_file, fragP->fr_line,
1900 _(".word %s-%s+%s didn't fit"),
1901 S_GET_NAME (lie->add),
1902 S_GET_NAME (lie->sub),
1903 buf);
1904 }
1905 lie->added = 1;
1906 if (fragP->fr_subtype == 0)
1907 {
1908 fragP->fr_subtype++;
1909 growth += md_short_jump_size;
1910 }
1911 for (untruth = lie->next_broken_word;
1912 untruth && untruth->dispfrag == lie->dispfrag;
1913 untruth = untruth->next_broken_word)
1914 if ((symbol_get_frag (untruth->add)
1915 == symbol_get_frag (lie->add))
1916 && (S_GET_VALUE (untruth->add)
1917 == S_GET_VALUE (lie->add)))
1918 {
1919 untruth->added = 2;
1920 untruth->use_jump = lie;
1921 }
1922 growth += md_long_jump_size;
1923 }
1924 }
1925
1926 break;
1927 } /* case rs_broken_word */
1928 #endif
1929 case rs_align:
1930 case rs_align_code:
1931 case rs_align_test:
1932 {
1933 addressT oldoff, newoff;
1934
1935 oldoff = relax_align (was_address + fragP->fr_fix,
1936 (int) offset);
1937 newoff = relax_align (address + fragP->fr_fix,
1938 (int) offset);
1939
1940 if (fragP->fr_subtype != 0)
1941 {
1942 if (oldoff > fragP->fr_subtype)
1943 oldoff = 0;
1944 if (newoff > fragP->fr_subtype)
1945 newoff = 0;
1946 }
1947
1948 growth = newoff - oldoff;
1949 }
1950 break;
1951
1952 case rs_org:
1953 {
1954 addressT target = offset;
1955 addressT after;
1956
1957 if (symbolP)
1958 {
1959 /* Convert from an actual address to an octet offset
1960 into the section. Here it is assumed that the
1961 section's VMA is zero, and can omit subtracting it
1962 from the symbol's value to get the address offset. */
1963 know (S_GET_SEGMENT (symbolP)->vma == 0);
1964 target += S_GET_VALUE (symbolP) * OCTETS_PER_BYTE;
1965 }
1966
1967 know (fragP->fr_next);
1968 after = fragP->fr_next->fr_address;
1969 growth = target - after;
1970 if (growth < 0)
1971 {
1972 /* Growth may be negative, but variable part of frag
1973 cannot have fewer than 0 chars. That is, we can't
1974 .org backwards. */
1975 as_bad_where (fragP->fr_file, fragP->fr_line,
1976 _("attempt to move .org backwards"));
1977
1978 /* We've issued an error message. Change the
1979 frag to avoid cascading errors. */
1980 fragP->fr_type = rs_align;
1981 fragP->fr_subtype = 0;
1982 fragP->fr_offset = 0;
1983 fragP->fr_fix = after - was_address;
1984 growth = stretch;
1985 }
1986
1987 /* This is an absolute growth factor */
1988 growth -= stretch;
1989 break;
1990 }
1991
1992 case rs_space:
1993 growth = 0;
1994 if (symbolP)
1995 {
1996 offsetT amount;
1997
1998 amount = S_GET_VALUE (symbolP);
1999 if (S_GET_SEGMENT (symbolP) != absolute_section
2000 || S_IS_COMMON (symbolP)
2001 || ! S_IS_DEFINED (symbolP))
2002 {
2003 as_bad_where (fragP->fr_file, fragP->fr_line,
2004 _(".space specifies non-absolute value"));
2005 /* Prevent repeat of this error message. */
2006 fragP->fr_symbol = 0;
2007 }
2008 else if (amount < 0)
2009 {
2010 as_warn_where (fragP->fr_file, fragP->fr_line,
2011 _(".space or .fill with negative value, ignored"));
2012 fragP->fr_symbol = 0;
2013 }
2014 else
2015 growth = (was_address + fragP->fr_fix + amount
2016 - fragP->fr_next->fr_address);
2017 }
2018 break;
2019
2020 case rs_machine_dependent:
2021 #ifdef md_relax_frag
2022 growth = md_relax_frag (segment, fragP, stretch);
2023 #else
2024 #ifdef TC_GENERIC_RELAX_TABLE
2025 /* The default way to relax a frag is to look through
2026 TC_GENERIC_RELAX_TABLE. */
2027 growth = relax_frag (segment, fragP, stretch);
2028 #endif /* TC_GENERIC_RELAX_TABLE */
2029 #endif
2030 break;
2031
2032 case rs_leb128:
2033 {
2034 valueT value;
2035 offsetT size;
2036
2037 value = resolve_symbol_value (fragP->fr_symbol);
2038 size = sizeof_leb128 (value, fragP->fr_subtype);
2039 growth = size - fragP->fr_offset;
2040 fragP->fr_offset = size;
2041 }
2042 break;
2043
2044 case rs_cfa:
2045 growth = eh_frame_relax_frag (fragP);
2046 break;
2047
2048 case rs_dwarf2dbg:
2049 growth = dwarf2dbg_relax_frag (fragP);
2050 break;
2051
2052 default:
2053 BAD_CASE (fragP->fr_type);
2054 break;
2055 }
2056 if (growth)
2057 {
2058 stretch += growth;
2059 stretched = 1;
2060 }
2061 }
2062 }
2063 /* Until nothing further to relax. */
2064 while (stretched && -- max_iterations);
2065
2066 if (stretched)
2067 as_fatal (_("Infinite loop encountered whilst attempting to compute the addresses of symbols in section %s"),
2068 segment_name (segment));
2069 }
2070
2071 ret = 0;
2072 for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next)
2073 if (fragP->last_fr_address != fragP->fr_address)
2074 {
2075 fragP->last_fr_address = fragP->fr_address;
2076 ret = 1;
2077 }
2078 return ret;
2079 }
2080
2081 /* fixup_segment()
2082
2083 Go through all the fixS's in a segment and see which ones can be
2084 handled now. (These consist of fixS where we have since discovered
2085 the value of a symbol, or the address of the frag involved.)
2086 For each one, call md_apply_fix to put the fix into the frag data.
2087
2088 Result is a count of how many relocation structs will be needed to
2089 handle the remaining fixS's that we couldn't completely handle here.
2090 These will be output later by emit_relocations(). */
2091
2092 static long
2093 fixup_segment (fixS *fixP, segT this_segment)
2094 {
2095 long seg_reloc_count = 0;
2096 valueT add_number;
2097 fragS *fragP;
2098 segT add_symbol_segment = absolute_section;
2099
2100 if (fixP != NULL && abs_section_sym == NULL)
2101 abs_section_sym = section_symbol (absolute_section);
2102
2103 /* If the linker is doing the relaxing, we must not do any fixups.
2104
2105 Well, strictly speaking that's not true -- we could do any that
2106 are PC-relative and don't cross regions that could change size.
2107 And for the i960 we might be able to turn callx/callj into bal
2108 anyways in cases where we know the maximum displacement. */
2109 if (linkrelax && TC_LINKRELAX_FIXUP (this_segment))
2110 {
2111 for (; fixP; fixP = fixP->fx_next)
2112 if (!fixP->fx_done)
2113 {
2114 if (fixP->fx_addsy == NULL)
2115 {
2116 /* There was no symbol required by this relocation.
2117 However, BFD doesn't really handle relocations
2118 without symbols well. So fake up a local symbol in
2119 the absolute section. */
2120 fixP->fx_addsy = abs_section_sym;
2121 }
2122 symbol_mark_used_in_reloc (fixP->fx_addsy);
2123 if (fixP->fx_subsy != NULL)
2124 symbol_mark_used_in_reloc (fixP->fx_subsy);
2125 seg_reloc_count++;
2126 }
2127 TC_ADJUST_RELOC_COUNT (fixP, seg_reloc_count);
2128 return seg_reloc_count;
2129 }
2130
2131 for (; fixP; fixP = fixP->fx_next)
2132 {
2133 #ifdef DEBUG5
2134 fprintf (stderr, "\nprocessing fixup:\n");
2135 print_fixup (fixP);
2136 #endif
2137
2138 fragP = fixP->fx_frag;
2139 know (fragP);
2140 #ifdef TC_VALIDATE_FIX
2141 TC_VALIDATE_FIX (fixP, this_segment, skip);
2142 #endif
2143 add_number = fixP->fx_offset;
2144
2145 if (fixP->fx_addsy != NULL
2146 && symbol_mri_common_p (fixP->fx_addsy))
2147 {
2148 add_number += S_GET_VALUE (fixP->fx_addsy);
2149 fixP->fx_offset = add_number;
2150 fixP->fx_addsy
2151 = symbol_get_value_expression (fixP->fx_addsy)->X_add_symbol;
2152 }
2153
2154 if (fixP->fx_addsy != NULL)
2155 add_symbol_segment = S_GET_SEGMENT (fixP->fx_addsy);
2156
2157 if (fixP->fx_subsy != NULL)
2158 {
2159 segT sub_symbol_segment;
2160 resolve_symbol_value (fixP->fx_subsy);
2161 sub_symbol_segment = S_GET_SEGMENT (fixP->fx_subsy);
2162 if (fixP->fx_addsy != NULL
2163 && sub_symbol_segment == add_symbol_segment
2164 && !TC_FORCE_RELOCATION_SUB_SAME (fixP, add_symbol_segment))
2165 {
2166 add_number += S_GET_VALUE (fixP->fx_addsy);
2167 add_number -= S_GET_VALUE (fixP->fx_subsy);
2168 fixP->fx_offset = add_number;
2169 fixP->fx_addsy = NULL;
2170 fixP->fx_subsy = NULL;
2171 #ifdef TC_M68K
2172 /* See the comment below about 68k weirdness. */
2173 fixP->fx_pcrel = 0;
2174 #endif
2175 }
2176 else if (sub_symbol_segment == absolute_section
2177 && !TC_FORCE_RELOCATION_SUB_ABS (fixP))
2178 {
2179 add_number -= S_GET_VALUE (fixP->fx_subsy);
2180 fixP->fx_offset = add_number;
2181 fixP->fx_subsy = NULL;
2182 }
2183 else if (sub_symbol_segment == this_segment
2184 && !TC_FORCE_RELOCATION_SUB_LOCAL (fixP))
2185 {
2186 add_number -= S_GET_VALUE (fixP->fx_subsy);
2187 fixP->fx_offset = (add_number + fixP->fx_dot_value
2188 + fixP->fx_frag->fr_address);
2189
2190 /* Make it pc-relative. If the back-end code has not
2191 selected a pc-relative reloc, cancel the adjustment
2192 we do later on all pc-relative relocs. */
2193 if (0
2194 #ifdef TC_M68K
2195 /* Do this for m68k even if it's already described
2196 as pc-relative. On the m68k, an operand of
2197 "pc@(foo-.-2)" should address "foo" in a
2198 pc-relative mode. */
2199 || 1
2200 #endif
2201 || !fixP->fx_pcrel)
2202 add_number += MD_PCREL_FROM_SECTION (fixP, this_segment);
2203 fixP->fx_subsy = NULL;
2204 fixP->fx_pcrel = 1;
2205 }
2206 else if (!TC_VALIDATE_FIX_SUB (fixP))
2207 {
2208 as_bad_where (fixP->fx_file, fixP->fx_line,
2209 _("can't resolve `%s' {%s section} - `%s' {%s section}"),
2210 fixP->fx_addsy ? S_GET_NAME (fixP->fx_addsy) : "0",
2211 segment_name (add_symbol_segment),
2212 S_GET_NAME (fixP->fx_subsy),
2213 segment_name (sub_symbol_segment));
2214 }
2215 }
2216
2217 if (fixP->fx_addsy)
2218 {
2219 if (add_symbol_segment == this_segment
2220 && !TC_FORCE_RELOCATION_LOCAL (fixP))
2221 {
2222 /* This fixup was made when the symbol's segment was
2223 SEG_UNKNOWN, but it is now in the local segment.
2224 So we know how to do the address without relocation. */
2225 add_number += S_GET_VALUE (fixP->fx_addsy);
2226 fixP->fx_offset = add_number;
2227 if (fixP->fx_pcrel)
2228 add_number -= MD_PCREL_FROM_SECTION (fixP, this_segment);
2229 fixP->fx_addsy = NULL;
2230 fixP->fx_pcrel = 0;
2231 }
2232 else if (add_symbol_segment == absolute_section
2233 && !TC_FORCE_RELOCATION_ABS (fixP))
2234 {
2235 add_number += S_GET_VALUE (fixP->fx_addsy);
2236 fixP->fx_offset = add_number;
2237 fixP->fx_addsy = NULL;
2238 }
2239 else if (add_symbol_segment != undefined_section
2240 && ! bfd_is_com_section (add_symbol_segment)
2241 && MD_APPLY_SYM_VALUE (fixP))
2242 add_number += S_GET_VALUE (fixP->fx_addsy);
2243 }
2244
2245 if (fixP->fx_pcrel)
2246 {
2247 add_number -= MD_PCREL_FROM_SECTION (fixP, this_segment);
2248 if (!fixP->fx_done && fixP->fx_addsy == NULL)
2249 {
2250 /* There was no symbol required by this relocation.
2251 However, BFD doesn't really handle relocations
2252 without symbols well. So fake up a local symbol in
2253 the absolute section. */
2254 fixP->fx_addsy = abs_section_sym;
2255 }
2256 }
2257
2258 if (!fixP->fx_done)
2259 md_apply_fix (fixP, &add_number, this_segment);
2260
2261 if (!fixP->fx_done)
2262 {
2263 ++seg_reloc_count;
2264 if (fixP->fx_addsy == NULL)
2265 fixP->fx_addsy = abs_section_sym;
2266 symbol_mark_used_in_reloc (fixP->fx_addsy);
2267 if (fixP->fx_subsy != NULL)
2268 symbol_mark_used_in_reloc (fixP->fx_subsy);
2269 }
2270
2271 if (!fixP->fx_bit_fixP && !fixP->fx_no_overflow && fixP->fx_size != 0)
2272 {
2273 if (fixP->fx_size < sizeof (valueT))
2274 {
2275 valueT mask;
2276
2277 mask = 0;
2278 mask--; /* Set all bits to one. */
2279 mask <<= fixP->fx_size * 8 - (fixP->fx_signed ? 1 : 0);
2280 if ((add_number & mask) != 0 && (add_number & mask) != mask)
2281 {
2282 char buf[50], buf2[50];
2283 sprint_value (buf, fragP->fr_address + fixP->fx_where);
2284 if (add_number > 1000)
2285 sprint_value (buf2, add_number);
2286 else
2287 sprintf (buf2, "%ld", (long) add_number);
2288 as_bad_where (fixP->fx_file, fixP->fx_line,
2289 _("value of %s too large for field of %d bytes at %s"),
2290 buf2, fixP->fx_size, buf);
2291 } /* Generic error checking. */
2292 }
2293 #ifdef WARN_SIGNED_OVERFLOW_WORD
2294 /* Warn if a .word value is too large when treated as a signed
2295 number. We already know it is not too negative. This is to
2296 catch over-large switches generated by gcc on the 68k. */
2297 if (!flag_signed_overflow_ok
2298 && fixP->fx_size == 2
2299 && add_number > 0x7fff)
2300 as_bad_where (fixP->fx_file, fixP->fx_line,
2301 _("signed .word overflow; switch may be too large; %ld at 0x%lx"),
2302 (long) add_number,
2303 (long) (fragP->fr_address + fixP->fx_where));
2304 #endif
2305 } /* Not a bit fix. */
2306
2307 #ifdef TC_VALIDATE_FIX
2308 skip: ATTRIBUTE_UNUSED_LABEL
2309 ;
2310 #endif
2311 #ifdef DEBUG5
2312 fprintf (stderr, "result:\n");
2313 print_fixup (fixP);
2314 #endif
2315 } /* For each fixS in this segment. */
2316
2317 TC_ADJUST_RELOC_COUNT (fixP, seg_reloc_count);
2318 return seg_reloc_count;
2319 }
2320
2321 void
2322 number_to_chars_bigendian (char *buf, valueT val, int n)
2323 {
2324 if (n <= 0)
2325 abort ();
2326 while (n--)
2327 {
2328 buf[n] = val & 0xff;
2329 val >>= 8;
2330 }
2331 }
2332
2333 void
2334 number_to_chars_littleendian (char *buf, valueT val, int n)
2335 {
2336 if (n <= 0)
2337 abort ();
2338 while (n--)
2339 {
2340 *buf++ = val & 0xff;
2341 val >>= 8;
2342 }
2343 }
2344
2345 void
2346 write_print_statistics (FILE *file)
2347 {
2348 fprintf (file, "fixups: %d\n", n_fixups);
2349 }
2350
2351 /* For debugging. */
2352 extern int indent_level;
2353
2354 void
2355 print_fixup (fixS *fixp)
2356 {
2357 indent_level = 1;
2358 fprintf (stderr, "fix %lx %s:%d", (long) fixp, fixp->fx_file, fixp->fx_line);
2359 if (fixp->fx_pcrel)
2360 fprintf (stderr, " pcrel");
2361 if (fixp->fx_pcrel_adjust)
2362 fprintf (stderr, " pcrel_adjust=%d", fixp->fx_pcrel_adjust);
2363 if (fixp->fx_im_disp)
2364 {
2365 #ifdef TC_NS32K
2366 fprintf (stderr, " im_disp=%d", fixp->fx_im_disp);
2367 #else
2368 fprintf (stderr, " im_disp");
2369 #endif
2370 }
2371 if (fixp->fx_tcbit)
2372 fprintf (stderr, " tcbit");
2373 if (fixp->fx_done)
2374 fprintf (stderr, " done");
2375 fprintf (stderr, "\n size=%d frag=%lx where=%ld offset=%lx addnumber=%lx",
2376 fixp->fx_size, (long) fixp->fx_frag, (long) fixp->fx_where,
2377 (long) fixp->fx_offset, (long) fixp->fx_addnumber);
2378 fprintf (stderr, "\n %s (%d)", bfd_get_reloc_code_name (fixp->fx_r_type),
2379 fixp->fx_r_type);
2380 if (fixp->fx_addsy)
2381 {
2382 fprintf (stderr, "\n +<");
2383 print_symbol_value_1 (stderr, fixp->fx_addsy);
2384 fprintf (stderr, ">");
2385 }
2386 if (fixp->fx_subsy)
2387 {
2388 fprintf (stderr, "\n -<");
2389 print_symbol_value_1 (stderr, fixp->fx_subsy);
2390 fprintf (stderr, ">");
2391 }
2392 fprintf (stderr, "\n");
2393 #ifdef TC_FIX_DATA_PRINT
2394 TC_FIX_DATA_PRINT (stderr, fixp);
2395 #endif
2396 }
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