* write.c (relax_segment): Add pass count arg. Don't error on
[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, 2006
4 Free Software Foundation, Inc.
5
6 This file is part of GAS, the GNU Assembler.
7
8 GAS is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
11 any later version.
12
13 GAS is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with GAS; see the file COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
21 02110-1301, USA. */
22
23 /* This thing should be set up to do byteordering correctly. But... */
24
25 #include "as.h"
26 #include "subsegs.h"
27 #include "obstack.h"
28 #include "output-file.h"
29 #include "dwarf2dbg.h"
30
31 #ifndef TC_ADJUST_RELOC_COUNT
32 #define TC_ADJUST_RELOC_COUNT(FIX, COUNT)
33 #endif
34
35 #ifndef TC_FORCE_RELOCATION
36 #define TC_FORCE_RELOCATION(FIX) \
37 (generic_force_reloc (FIX))
38 #endif
39
40 #ifndef TC_FORCE_RELOCATION_ABS
41 #define TC_FORCE_RELOCATION_ABS(FIX) \
42 (TC_FORCE_RELOCATION (FIX))
43 #endif
44
45 #ifndef TC_FORCE_RELOCATION_LOCAL
46 #define TC_FORCE_RELOCATION_LOCAL(FIX) \
47 (!(FIX)->fx_pcrel \
48 || (FIX)->fx_plt \
49 || TC_FORCE_RELOCATION (FIX))
50 #endif
51
52 #ifndef TC_FORCE_RELOCATION_SUB_SAME
53 #define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEG) \
54 (! SEG_NORMAL (SEG))
55 #endif
56
57 #ifndef TC_FORCE_RELOCATION_SUB_ABS
58 #define TC_FORCE_RELOCATION_SUB_ABS(FIX) 0
59 #endif
60
61 #ifndef TC_FORCE_RELOCATION_SUB_LOCAL
62 #ifdef DIFF_EXPR_OK
63 #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX) 0
64 #else
65 #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX) 1
66 #endif
67 #endif
68
69 #ifndef TC_VALIDATE_FIX_SUB
70 #ifdef UNDEFINED_DIFFERENCE_OK
71 /* The PA needs this for PIC code generation. */
72 #define TC_VALIDATE_FIX_SUB(FIX) 1
73 #else
74 #define TC_VALIDATE_FIX_SUB(FIX) \
75 ((FIX)->fx_r_type == BFD_RELOC_GPREL32 \
76 || (FIX)->fx_r_type == BFD_RELOC_GPREL16)
77 #endif
78 #endif
79
80 #ifndef TC_LINKRELAX_FIXUP
81 #define TC_LINKRELAX_FIXUP(SEG) 1
82 #endif
83
84 #ifndef MD_APPLY_SYM_VALUE
85 #define MD_APPLY_SYM_VALUE(FIX) 1
86 #endif
87
88 #ifndef TC_FINALIZE_SYMS_BEFORE_SIZE_SEG
89 #define TC_FINALIZE_SYMS_BEFORE_SIZE_SEG 1
90 #endif
91
92 #ifndef MD_PCREL_FROM_SECTION
93 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from (FIX)
94 #endif
95
96 #ifndef TC_FAKE_LABEL
97 #define TC_FAKE_LABEL(NAME) (strcmp ((NAME), FAKE_LABEL_NAME) == 0)
98 #endif
99
100 /* Used to control final evaluation of expressions. */
101 int finalize_syms = 0;
102
103 int symbol_table_frozen;
104
105 symbolS *abs_section_sym;
106
107 /* Remember the value of dot when parsing expressions. */
108 addressT dot_value;
109
110 void print_fixup (fixS *);
111
112 static void renumber_sections (bfd *, asection *, PTR);
113
114 /* We generally attach relocs to frag chains. However, after we have
115 chained these all together into a segment, any relocs we add after
116 that must be attached to a segment. This will include relocs added
117 in md_estimate_size_for_relax, for example. */
118 static int frags_chained = 0;
119
120 static int n_fixups;
121
122 #define RELOC_ENUM enum bfd_reloc_code_real
123
124 static fixS *fix_new_internal (fragS *, int where, int size,
125 symbolS *add, symbolS *sub,
126 offsetT offset, int pcrel,
127 RELOC_ENUM r_type);
128 static long fixup_segment (fixS *, segT);
129 static relax_addressT relax_align (relax_addressT addr, int align);
130 static fragS *chain_frchains_together_1 (segT, struct frchain *);
131 static void chain_frchains_together (bfd *, segT, PTR);
132 static void cvt_frag_to_fill (segT, fragS *);
133 static void adjust_reloc_syms (bfd *, asection *, PTR);
134 static void fix_segment (bfd *, asection *, PTR);
135 static void write_relocs (bfd *, asection *, PTR);
136 static void write_contents (bfd *, asection *, PTR);
137 static void set_symtab (void);
138 static void merge_data_into_text (void);
139
140 /* Create a fixS in obstack 'notes'. */
141
142 static fixS *
143 fix_new_internal (fragS *frag, /* Which frag? */
144 int where, /* Where in that frag? */
145 int size, /* 1, 2, or 4 usually. */
146 symbolS *add_symbol, /* X_add_symbol. */
147 symbolS *sub_symbol, /* X_op_symbol. */
148 offsetT offset, /* X_add_number. */
149 int pcrel, /* TRUE if PC-relative relocation. */
150 RELOC_ENUM r_type ATTRIBUTE_UNUSED /* Relocation type. */)
151 {
152 fixS *fixP;
153
154 n_fixups++;
155
156 fixP = (fixS *) obstack_alloc (&notes, sizeof (fixS));
157
158 fixP->fx_frag = frag;
159 fixP->fx_where = where;
160 fixP->fx_size = size;
161 /* We've made fx_size a narrow field; check that it's wide enough. */
162 if (fixP->fx_size != size)
163 {
164 as_bad (_("field fx_size too small to hold %d"), size);
165 abort ();
166 }
167 fixP->fx_addsy = add_symbol;
168 fixP->fx_subsy = sub_symbol;
169 fixP->fx_offset = offset;
170 fixP->fx_dot_value = dot_value;
171 fixP->fx_pcrel = pcrel;
172 fixP->fx_plt = 0;
173 fixP->fx_r_type = r_type;
174 fixP->fx_im_disp = 0;
175 fixP->fx_pcrel_adjust = 0;
176 fixP->fx_bit_fixP = 0;
177 fixP->fx_addnumber = 0;
178 fixP->fx_tcbit = 0;
179 fixP->fx_done = 0;
180 fixP->fx_no_overflow = 0;
181 fixP->fx_signed = 0;
182
183 #ifdef USING_CGEN
184 fixP->fx_cgen.insn = NULL;
185 fixP->fx_cgen.opinfo = 0;
186 #endif
187
188 #ifdef TC_FIX_TYPE
189 TC_INIT_FIX_DATA (fixP);
190 #endif
191
192 as_where (&fixP->fx_file, &fixP->fx_line);
193
194 /* Usually, we want relocs sorted numerically, but while
195 comparing to older versions of gas that have relocs
196 reverse sorted, it is convenient to have this compile
197 time option. xoxorich. */
198 {
199
200 fixS **seg_fix_rootP = (frags_chained
201 ? &seg_info (now_seg)->fix_root
202 : &frchain_now->fix_root);
203 fixS **seg_fix_tailP = (frags_chained
204 ? &seg_info (now_seg)->fix_tail
205 : &frchain_now->fix_tail);
206
207 #ifdef REVERSE_SORT_RELOCS
208
209 fixP->fx_next = *seg_fix_rootP;
210 *seg_fix_rootP = fixP;
211
212 #else /* REVERSE_SORT_RELOCS */
213
214 fixP->fx_next = NULL;
215
216 if (*seg_fix_tailP)
217 (*seg_fix_tailP)->fx_next = fixP;
218 else
219 *seg_fix_rootP = fixP;
220 *seg_fix_tailP = fixP;
221
222 #endif /* REVERSE_SORT_RELOCS */
223 }
224
225 return fixP;
226 }
227
228 /* Create a fixup relative to a symbol (plus a constant). */
229
230 fixS *
231 fix_new (fragS *frag, /* Which frag? */
232 int where, /* Where in that frag? */
233 int size, /* 1, 2, or 4 usually. */
234 symbolS *add_symbol, /* X_add_symbol. */
235 offsetT offset, /* X_add_number. */
236 int pcrel, /* TRUE if PC-relative relocation. */
237 RELOC_ENUM r_type /* Relocation type. */)
238 {
239 return fix_new_internal (frag, where, size, add_symbol,
240 (symbolS *) NULL, offset, pcrel, r_type);
241 }
242
243 /* Create a fixup for an expression. Currently we only support fixups
244 for difference expressions. That is itself more than most object
245 file formats support anyhow. */
246
247 fixS *
248 fix_new_exp (fragS *frag, /* Which frag? */
249 int where, /* Where in that frag? */
250 int size, /* 1, 2, or 4 usually. */
251 expressionS *exp, /* Expression. */
252 int pcrel, /* TRUE if PC-relative relocation. */
253 RELOC_ENUM r_type /* Relocation type. */)
254 {
255 symbolS *add = NULL;
256 symbolS *sub = NULL;
257 offsetT off = 0;
258
259 switch (exp->X_op)
260 {
261 case O_absent:
262 break;
263
264 case O_register:
265 as_bad (_("register value used as expression"));
266 break;
267
268 case O_add:
269 /* This comes up when _GLOBAL_OFFSET_TABLE_+(.-L0) is read, if
270 the difference expression cannot immediately be reduced. */
271 {
272 symbolS *stmp = make_expr_symbol (exp);
273
274 exp->X_op = O_symbol;
275 exp->X_op_symbol = 0;
276 exp->X_add_symbol = stmp;
277 exp->X_add_number = 0;
278
279 return fix_new_exp (frag, where, size, exp, pcrel, r_type);
280 }
281
282 case O_symbol_rva:
283 add = exp->X_add_symbol;
284 off = exp->X_add_number;
285 r_type = BFD_RELOC_RVA;
286 break;
287
288 case O_uminus:
289 sub = exp->X_add_symbol;
290 off = exp->X_add_number;
291 break;
292
293 case O_subtract:
294 sub = exp->X_op_symbol;
295 /* Fall through. */
296 case O_symbol:
297 add = exp->X_add_symbol;
298 /* Fall through. */
299 case O_constant:
300 off = exp->X_add_number;
301 break;
302
303 default:
304 add = make_expr_symbol (exp);
305 break;
306 }
307
308 return fix_new_internal (frag, where, size, add, sub, off, pcrel, r_type);
309 }
310
311 /* Generic function to determine whether a fixup requires a relocation. */
312 int
313 generic_force_reloc (fixS *fix)
314 {
315 if (fix->fx_r_type == BFD_RELOC_VTABLE_INHERIT
316 || fix->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
317 return 1;
318
319 if (fix->fx_addsy == NULL)
320 return 0;
321
322 return S_FORCE_RELOC (fix->fx_addsy, fix->fx_subsy == NULL);
323 }
324
325 /* Append a string onto another string, bumping the pointer along. */
326 void
327 append (char **charPP, char *fromP, unsigned long length)
328 {
329 /* Don't trust memcpy() of 0 chars. */
330 if (length == 0)
331 return;
332
333 memcpy (*charPP, fromP, length);
334 *charPP += length;
335 }
336
337 /* This routine records the largest alignment seen for each segment.
338 If the beginning of the segment is aligned on the worst-case
339 boundary, all of the other alignments within it will work. At
340 least one object format really uses this info. */
341
342 void
343 record_alignment (/* Segment to which alignment pertains. */
344 segT seg,
345 /* Alignment, as a power of 2 (e.g., 1 => 2-byte
346 boundary, 2 => 4-byte boundary, etc.) */
347 int align)
348 {
349 if (seg == absolute_section)
350 return;
351
352 if ((unsigned int) align > bfd_get_section_alignment (stdoutput, seg))
353 bfd_set_section_alignment (stdoutput, seg, align);
354 }
355
356 int
357 get_recorded_alignment (segT seg)
358 {
359 if (seg == absolute_section)
360 return 0;
361
362 return bfd_get_section_alignment (stdoutput, seg);
363 }
364
365 /* Reset the section indices after removing the gas created sections. */
366
367 static void
368 renumber_sections (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, PTR countparg)
369 {
370 int *countp = (int *) countparg;
371
372 sec->index = *countp;
373 ++*countp;
374 }
375
376 static fragS *
377 chain_frchains_together_1 (segT section, struct frchain *frchp)
378 {
379 fragS dummy, *prev_frag = &dummy;
380 fixS fix_dummy, *prev_fix = &fix_dummy;
381
382 for (; frchp; frchp = frchp->frch_next)
383 {
384 prev_frag->fr_next = frchp->frch_root;
385 prev_frag = frchp->frch_last;
386 assert (prev_frag->fr_type != 0);
387 if (frchp->fix_root != (fixS *) NULL)
388 {
389 if (seg_info (section)->fix_root == (fixS *) NULL)
390 seg_info (section)->fix_root = frchp->fix_root;
391 prev_fix->fx_next = frchp->fix_root;
392 seg_info (section)->fix_tail = frchp->fix_tail;
393 prev_fix = frchp->fix_tail;
394 }
395 }
396 assert (prev_frag->fr_type != 0);
397 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 struct relax_seg_info
516 {
517 int pass;
518 int changed;
519 };
520
521 static void
522 relax_seg (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *xxx)
523 {
524 segment_info_type *seginfo = seg_info (sec);
525 struct relax_seg_info *info = (struct relax_seg_info *) xxx;
526
527 if (seginfo && seginfo->frchainP
528 && relax_segment (seginfo->frchainP->frch_root, sec, info->pass))
529 info->changed = 1;
530 }
531
532 static void size_seg (bfd *, asection *, PTR);
533
534 static void
535 size_seg (bfd *abfd, asection *sec, PTR xxx ATTRIBUTE_UNUSED)
536 {
537 flagword flags;
538 fragS *fragp;
539 segment_info_type *seginfo;
540 int x;
541 valueT size, newsize;
542
543 subseg_change (sec, 0);
544
545 seginfo = seg_info (sec);
546 if (seginfo && seginfo->frchainP)
547 {
548 for (fragp = seginfo->frchainP->frch_root; fragp; fragp = fragp->fr_next)
549 cvt_frag_to_fill (sec, fragp);
550 for (fragp = seginfo->frchainP->frch_root;
551 fragp->fr_next;
552 fragp = fragp->fr_next)
553 /* Walk to last elt. */
554 ;
555 size = fragp->fr_address + fragp->fr_fix;
556 }
557 else
558 size = 0;
559
560 flags = bfd_get_section_flags (abfd, sec);
561
562 if (size > 0 && ! seginfo->bss)
563 flags |= SEC_HAS_CONTENTS;
564
565 /* @@ This is just an approximation. */
566 if (seginfo && seginfo->fix_root)
567 flags |= SEC_RELOC;
568 else
569 flags &= ~SEC_RELOC;
570 x = bfd_set_section_flags (abfd, sec, flags);
571 assert (x);
572
573 newsize = md_section_align (sec, size);
574 x = bfd_set_section_size (abfd, sec, newsize);
575 assert (x);
576
577 /* If the size had to be rounded up, add some padding in the last
578 non-empty frag. */
579 assert (newsize >= size);
580 if (size != newsize)
581 {
582 fragS *last = seginfo->frchainP->frch_last;
583 fragp = seginfo->frchainP->frch_root;
584 while (fragp->fr_next != last)
585 fragp = fragp->fr_next;
586 last->fr_address = size;
587 if ((newsize - size) % fragp->fr_var == 0)
588 fragp->fr_offset += (newsize - size) / fragp->fr_var;
589 else
590 /* If we hit this abort, it's likely due to subsegs_finish not
591 providing sufficient alignment on the last frag, and the
592 machine dependent code using alignment frags with fr_var
593 greater than 1. */
594 abort ();
595 }
596
597 #ifdef tc_frob_section
598 tc_frob_section (sec);
599 #endif
600 #ifdef obj_frob_section
601 obj_frob_section (sec);
602 #endif
603 }
604
605 #ifdef DEBUG2
606 static void
607 dump_section_relocs (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, FILE *stream)
608 {
609 segment_info_type *seginfo = seg_info (sec);
610 fixS *fixp = seginfo->fix_root;
611
612 if (!fixp)
613 return;
614
615 fprintf (stream, "sec %s relocs:\n", sec->name);
616 while (fixp)
617 {
618 symbolS *s = fixp->fx_addsy;
619
620 fprintf (stream, " %08lx: type %d ", (unsigned long) fixp,
621 (int) fixp->fx_r_type);
622 if (s == NULL)
623 fprintf (stream, "no sym\n");
624 else
625 {
626 print_symbol_value_1 (stream, s);
627 fprintf (stream, "\n");
628 }
629 fixp = fixp->fx_next;
630 }
631 }
632 #else
633 #define dump_section_relocs(ABFD,SEC,STREAM) ((void) 0)
634 #endif
635
636 #ifndef EMIT_SECTION_SYMBOLS
637 #define EMIT_SECTION_SYMBOLS 1
638 #endif
639
640 /* This pass over fixups decides whether symbols can be replaced with
641 section symbols. */
642
643 static void
644 adjust_reloc_syms (bfd *abfd ATTRIBUTE_UNUSED,
645 asection *sec,
646 PTR xxx ATTRIBUTE_UNUSED)
647 {
648 segment_info_type *seginfo = seg_info (sec);
649 fixS *fixp;
650
651 if (seginfo == NULL)
652 return;
653
654 dump_section_relocs (abfd, sec, stderr);
655
656 for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next)
657 if (fixp->fx_done)
658 /* Ignore it. */
659 ;
660 else if (fixp->fx_addsy)
661 {
662 symbolS *sym;
663 asection *symsec;
664
665 #ifdef DEBUG5
666 fprintf (stderr, "\n\nadjusting fixup:\n");
667 print_fixup (fixp);
668 #endif
669
670 sym = fixp->fx_addsy;
671
672 /* All symbols should have already been resolved at this
673 point. It is possible to see unresolved expression
674 symbols, though, since they are not in the regular symbol
675 table. */
676 resolve_symbol_value (sym);
677
678 if (fixp->fx_subsy != NULL)
679 resolve_symbol_value (fixp->fx_subsy);
680
681 /* If this symbol is equated to an undefined or common symbol,
682 convert the fixup to being against that symbol. */
683 if (symbol_equated_reloc_p (sym)
684 || S_IS_WEAKREFR (sym))
685 {
686 fixp->fx_offset += symbol_get_value_expression (sym)->X_add_number;
687 sym = symbol_get_value_expression (sym)->X_add_symbol;
688 fixp->fx_addsy = sym;
689 }
690
691 if (symbol_mri_common_p (sym))
692 {
693 /* These symbols are handled specially in fixup_segment. */
694 continue;
695 }
696
697 /* If the symbol is undefined, common, weak, or global (ELF
698 shared libs), we can't replace it with the section symbol. */
699 if (S_FORCE_RELOC (fixp->fx_addsy, 1))
700 continue;
701
702 /* Is there some other (target cpu dependent) reason we can't adjust
703 this one? (E.g. relocations involving function addresses on
704 the PA. */
705 #ifdef tc_fix_adjustable
706 if (! tc_fix_adjustable (fixp))
707 continue;
708 #endif
709
710 /* Since we're reducing to section symbols, don't attempt to reduce
711 anything that's already using one. */
712 if (symbol_section_p (sym))
713 continue;
714
715 symsec = S_GET_SEGMENT (sym);
716 if (symsec == NULL)
717 abort ();
718
719 if (bfd_is_abs_section (symsec))
720 {
721 /* The fixup_segment routine normally will not use this
722 symbol in a relocation. */
723 continue;
724 }
725
726 /* Don't try to reduce relocs which refer to non-local symbols
727 in .linkonce sections. It can lead to confusion when a
728 debugging section refers to a .linkonce section. I hope
729 this will always be correct. */
730 if (symsec != sec && ! S_IS_LOCAL (sym))
731 {
732 if ((symsec->flags & SEC_LINK_ONCE) != 0
733 || (IS_ELF
734 /* The GNU toolchain uses an extension for ELF: a
735 section beginning with the magic string
736 .gnu.linkonce is a linkonce section. */
737 && strncmp (segment_name (symsec), ".gnu.linkonce",
738 sizeof ".gnu.linkonce" - 1) == 0))
739 continue;
740 }
741
742 /* Never adjust a reloc against local symbol in a merge section
743 with non-zero addend. */
744 if ((symsec->flags & SEC_MERGE) != 0
745 && (fixp->fx_offset != 0 || fixp->fx_subsy != NULL))
746 continue;
747
748 /* Never adjust a reloc against TLS local symbol. */
749 if ((symsec->flags & SEC_THREAD_LOCAL) != 0)
750 continue;
751
752 /* We refetch the segment when calling section_symbol, rather
753 than using symsec, because S_GET_VALUE may wind up changing
754 the section when it calls resolve_symbol_value. */
755 fixp->fx_offset += S_GET_VALUE (sym);
756 fixp->fx_addsy = section_symbol (S_GET_SEGMENT (sym));
757 #ifdef DEBUG5
758 fprintf (stderr, "\nadjusted fixup:\n");
759 print_fixup (fixp);
760 #endif
761 }
762
763 dump_section_relocs (abfd, sec, stderr);
764 }
765
766 static void
767 fix_segment (bfd *abfd ATTRIBUTE_UNUSED,
768 asection *sec,
769 PTR xxx ATTRIBUTE_UNUSED)
770 {
771 segment_info_type *seginfo = seg_info (sec);
772
773 fixup_segment (seginfo->fix_root, sec);
774 }
775
776 static void
777 write_relocs (bfd *abfd, asection *sec, PTR xxx ATTRIBUTE_UNUSED)
778 {
779 segment_info_type *seginfo = seg_info (sec);
780 unsigned int i;
781 unsigned int n;
782 arelent **relocs;
783 fixS *fixp;
784 char *err;
785
786 /* If seginfo is NULL, we did not create this section; don't do
787 anything with it. */
788 if (seginfo == NULL)
789 return;
790
791 n = 0;
792 for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next)
793 n++;
794
795 #ifndef RELOC_EXPANSION_POSSIBLE
796 /* Set up reloc information as well. */
797 relocs = (arelent **) xcalloc (n, sizeof (arelent *));
798
799 i = 0;
800 for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next)
801 {
802 arelent *reloc;
803 bfd_reloc_status_type s;
804 symbolS *sym;
805
806 if (fixp->fx_done)
807 {
808 n--;
809 continue;
810 }
811
812 /* If this is an undefined symbol which was equated to another
813 symbol, then generate the reloc against the latter symbol
814 rather than the former. */
815 sym = fixp->fx_addsy;
816 while (symbol_equated_reloc_p (sym))
817 {
818 symbolS *n;
819
820 /* We must avoid looping, as that can occur with a badly
821 written program. */
822 n = symbol_get_value_expression (sym)->X_add_symbol;
823 if (n == sym)
824 break;
825 fixp->fx_offset += symbol_get_value_expression (sym)->X_add_number;
826 sym = n;
827 }
828 fixp->fx_addsy = sym;
829
830 reloc = tc_gen_reloc (sec, fixp);
831 if (!reloc)
832 {
833 n--;
834 continue;
835 }
836
837 /*
838 This test is triggered inappropriately for the SH:
839 if (fixp->fx_where + fixp->fx_size
840 > fixp->fx_frag->fr_fix + fixp->fx_frag->fr_offset)
841 abort ();
842 */
843
844 s = bfd_install_relocation (stdoutput, reloc,
845 fixp->fx_frag->fr_literal,
846 fixp->fx_frag->fr_address,
847 sec, &err);
848 switch (s)
849 {
850 case bfd_reloc_ok:
851 break;
852 case bfd_reloc_overflow:
853 as_bad_where (fixp->fx_file, fixp->fx_line,
854 _("relocation overflow"));
855 break;
856 case bfd_reloc_outofrange:
857 as_bad_where (fixp->fx_file, fixp->fx_line,
858 _("relocation out of range"));
859 break;
860 default:
861 as_fatal (_("%s:%u: bad return from bfd_install_relocation: %x"),
862 fixp->fx_file, fixp->fx_line, s);
863 }
864 relocs[i++] = reloc;
865 }
866 #else
867 n = n * MAX_RELOC_EXPANSION;
868 /* Set up reloc information as well. */
869 relocs = (arelent **) xcalloc (n, sizeof (arelent *));
870
871 i = 0;
872 for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next)
873 {
874 arelent **reloc;
875 bfd_reloc_status_type s;
876 symbolS *sym;
877 int j;
878
879 if (fixp->fx_done)
880 {
881 n--;
882 continue;
883 }
884
885 /* If this is an undefined symbol which was equated to another
886 symbol, then generate the reloc against the latter symbol
887 rather than the former. */
888 sym = fixp->fx_addsy;
889 while (symbol_equated_reloc_p (sym))
890 {
891 symbolS *n;
892
893 /* We must avoid looping, as that can occur with a badly
894 written program. */
895 n = symbol_get_value_expression (sym)->X_add_symbol;
896 if (n == sym)
897 break;
898 fixp->fx_offset += symbol_get_value_expression (sym)->X_add_number;
899 sym = n;
900 }
901 fixp->fx_addsy = sym;
902
903 reloc = tc_gen_reloc (sec, fixp);
904
905 for (j = 0; reloc[j]; j++)
906 {
907 relocs[i++] = reloc[j];
908 assert (i <= n);
909 }
910 if (fixp->fx_where + fixp->fx_size
911 > fixp->fx_frag->fr_fix + fixp->fx_frag->fr_offset)
912 as_bad_where (fixp->fx_file, fixp->fx_line,
913 _("internal error: fixup not contained within frag"));
914 for (j = 0; reloc[j]; j++)
915 {
916 s = bfd_install_relocation (stdoutput, reloc[j],
917 fixp->fx_frag->fr_literal,
918 fixp->fx_frag->fr_address,
919 sec, &err);
920 switch (s)
921 {
922 case bfd_reloc_ok:
923 break;
924 case bfd_reloc_overflow:
925 as_bad_where (fixp->fx_file, fixp->fx_line,
926 _("relocation overflow"));
927 break;
928 case bfd_reloc_outofrange:
929 as_bad_where (fixp->fx_file, fixp->fx_line,
930 _("relocation out of range"));
931 break;
932 default:
933 as_fatal (_("%s:%u: bad return from bfd_install_relocation: %x"),
934 fixp->fx_file, fixp->fx_line, s);
935 }
936 }
937 }
938 n = i;
939 #endif
940
941 #ifdef DEBUG4
942 {
943 unsigned int i, j, nsyms;
944 asymbol **sympp;
945 sympp = bfd_get_outsymbols (stdoutput);
946 nsyms = bfd_get_symcount (stdoutput);
947 for (i = 0; i < n; i++)
948 if (((*relocs[i]->sym_ptr_ptr)->flags & BSF_SECTION_SYM) == 0)
949 {
950 for (j = 0; j < nsyms; j++)
951 if (sympp[j] == *relocs[i]->sym_ptr_ptr)
952 break;
953 if (j == nsyms)
954 abort ();
955 }
956 }
957 #endif
958
959 if (n)
960 bfd_set_reloc (stdoutput, sec, relocs, n);
961 else
962 bfd_set_section_flags (abfd, sec,
963 (bfd_get_section_flags (abfd, sec)
964 & (flagword) ~SEC_RELOC));
965
966 #ifdef SET_SECTION_RELOCS
967 SET_SECTION_RELOCS (sec, relocs, n);
968 #endif
969
970 #ifdef DEBUG3
971 {
972 unsigned int i;
973 arelent *r;
974 asymbol *s;
975 fprintf (stderr, "relocs for sec %s\n", sec->name);
976 for (i = 0; i < n; i++)
977 {
978 r = relocs[i];
979 s = *r->sym_ptr_ptr;
980 fprintf (stderr, " reloc %2d @%p off %4lx : sym %-10s addend %lx\n",
981 i, r, (unsigned long)r->address, s->name, (unsigned long)r->addend);
982 }
983 }
984 #endif
985 }
986
987 static void
988 write_contents (bfd *abfd ATTRIBUTE_UNUSED,
989 asection *sec,
990 PTR xxx ATTRIBUTE_UNUSED)
991 {
992 segment_info_type *seginfo = seg_info (sec);
993 addressT offset = 0;
994 fragS *f;
995
996 /* Write out the frags. */
997 if (seginfo == NULL
998 || !(bfd_get_section_flags (abfd, sec) & SEC_HAS_CONTENTS))
999 return;
1000
1001 for (f = seginfo->frchainP->frch_root;
1002 f;
1003 f = f->fr_next)
1004 {
1005 int x;
1006 addressT fill_size;
1007 char *fill_literal;
1008 offsetT count;
1009
1010 assert (f->fr_type == rs_fill);
1011 if (f->fr_fix)
1012 {
1013 x = bfd_set_section_contents (stdoutput, sec,
1014 f->fr_literal, (file_ptr) offset,
1015 (bfd_size_type) f->fr_fix);
1016 if (!x)
1017 {
1018 bfd_perror (stdoutput->filename);
1019 as_perror (_("FATAL: Can't write %s"), stdoutput->filename);
1020 exit (EXIT_FAILURE);
1021 }
1022 offset += f->fr_fix;
1023 }
1024 fill_literal = f->fr_literal + f->fr_fix;
1025 fill_size = f->fr_var;
1026 count = f->fr_offset;
1027 assert (count >= 0);
1028 if (fill_size && count)
1029 {
1030 char buf[256];
1031 if (fill_size > sizeof (buf))
1032 {
1033 /* Do it the old way. Can this ever happen? */
1034 while (count--)
1035 {
1036 x = bfd_set_section_contents (stdoutput, sec,
1037 fill_literal,
1038 (file_ptr) offset,
1039 (bfd_size_type) fill_size);
1040 if (!x)
1041 {
1042 bfd_perror (stdoutput->filename);
1043 as_perror (_("FATAL: Can't write %s"),
1044 stdoutput->filename);
1045 exit (EXIT_FAILURE);
1046 }
1047 offset += fill_size;
1048 }
1049 }
1050 else
1051 {
1052 /* Build a buffer full of fill objects and output it as
1053 often as necessary. This saves on the overhead of
1054 potentially lots of bfd_set_section_contents calls. */
1055 int n_per_buf, i;
1056 if (fill_size == 1)
1057 {
1058 n_per_buf = sizeof (buf);
1059 memset (buf, *fill_literal, n_per_buf);
1060 }
1061 else
1062 {
1063 char *bufp;
1064 n_per_buf = sizeof (buf) / fill_size;
1065 for (i = n_per_buf, bufp = buf; i; i--, bufp += fill_size)
1066 memcpy (bufp, fill_literal, fill_size);
1067 }
1068 for (; count > 0; count -= n_per_buf)
1069 {
1070 n_per_buf = n_per_buf > count ? count : n_per_buf;
1071 x = bfd_set_section_contents
1072 (stdoutput, sec, buf, (file_ptr) offset,
1073 (bfd_size_type) n_per_buf * fill_size);
1074 if (!x)
1075 as_fatal (_("cannot write to output file"));
1076 offset += n_per_buf * fill_size;
1077 }
1078 }
1079 }
1080 }
1081 }
1082
1083 static void
1084 merge_data_into_text (void)
1085 {
1086 seg_info (text_section)->frchainP->frch_last->fr_next =
1087 seg_info (data_section)->frchainP->frch_root;
1088 seg_info (text_section)->frchainP->frch_last =
1089 seg_info (data_section)->frchainP->frch_last;
1090 seg_info (data_section)->frchainP = 0;
1091 }
1092
1093 static void
1094 set_symtab (void)
1095 {
1096 int nsyms;
1097 asymbol **asympp;
1098 symbolS *symp;
1099 bfd_boolean result;
1100 extern PTR bfd_alloc (bfd *, bfd_size_type);
1101
1102 /* Count symbols. We can't rely on a count made by the loop in
1103 write_object_file, because *_frob_file may add a new symbol or
1104 two. */
1105 nsyms = 0;
1106 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
1107 nsyms++;
1108
1109 if (nsyms)
1110 {
1111 int i;
1112 bfd_size_type amt = (bfd_size_type) nsyms * sizeof (asymbol *);
1113
1114 asympp = (asymbol **) bfd_alloc (stdoutput, amt);
1115 symp = symbol_rootP;
1116 for (i = 0; i < nsyms; i++, symp = symbol_next (symp))
1117 {
1118 asympp[i] = symbol_get_bfdsym (symp);
1119 symbol_mark_written (symp);
1120 }
1121 }
1122 else
1123 asympp = 0;
1124 result = bfd_set_symtab (stdoutput, asympp, nsyms);
1125 assert (result);
1126 symbol_table_frozen = 1;
1127 }
1128
1129 /* Finish the subsegments. After every sub-segment, we fake an
1130 ".align ...". This conforms to BSD4.2 brane-damage. We then fake
1131 ".fill 0" because that is the kind of frag that requires least
1132 thought. ".align" frags like to have a following frag since that
1133 makes calculating their intended length trivial. */
1134
1135 #ifndef SUB_SEGMENT_ALIGN
1136 #ifdef HANDLE_ALIGN
1137 /* The last subsegment gets an alignment corresponding to the alignment
1138 of the section. This allows proper nop-filling at the end of
1139 code-bearing sections. */
1140 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) \
1141 (!(FRCHAIN)->frch_next ? get_recorded_alignment (SEG) : 0)
1142 #else
1143 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) 0
1144 #endif
1145 #endif
1146
1147 void
1148 subsegs_finish (void)
1149 {
1150 struct frchain *frchainP;
1151 asection *s;
1152
1153 for (s = stdoutput->sections; s; s = s->next)
1154 {
1155 segment_info_type *seginfo = seg_info (s);
1156 if (!seginfo)
1157 continue;
1158
1159 for (frchainP = seginfo->frchainP;
1160 frchainP != NULL;
1161 frchainP = frchainP->frch_next)
1162 {
1163 int alignment = 0;
1164
1165 subseg_set (s, frchainP->frch_subseg);
1166
1167 /* This now gets called even if we had errors. In that case,
1168 any alignment is meaningless, and, moreover, will look weird
1169 if we are generating a listing. */
1170 if (!had_errors ())
1171 {
1172 alignment = SUB_SEGMENT_ALIGN (now_seg, frchainP);
1173 if ((bfd_get_section_flags (now_seg->owner, now_seg) & SEC_MERGE)
1174 && now_seg->entsize)
1175 {
1176 unsigned int entsize = now_seg->entsize;
1177 int entalign = 0;
1178
1179 while ((entsize & 1) == 0)
1180 {
1181 ++entalign;
1182 entsize >>= 1;
1183 }
1184 if (entalign > alignment)
1185 alignment = entalign;
1186 }
1187 }
1188
1189 if (subseg_text_p (now_seg))
1190 frag_align_code (alignment, 0);
1191 else
1192 frag_align (alignment, 0, 0);
1193
1194 /* frag_align will have left a new frag.
1195 Use this last frag for an empty ".fill".
1196
1197 For this segment ...
1198 Create a last frag. Do not leave a "being filled in frag". */
1199 frag_wane (frag_now);
1200 frag_now->fr_fix = 0;
1201 know (frag_now->fr_next == NULL);
1202 }
1203 }
1204 }
1205
1206 /* Write the object file. */
1207
1208 void
1209 write_object_file (void)
1210 {
1211 struct relax_seg_info rsi;
1212 #ifndef WORKING_DOT_WORD
1213 fragS *fragP; /* Track along all frags. */
1214 #endif
1215
1216 /* Do we really want to write it? */
1217 {
1218 int n_warns, n_errs;
1219 n_warns = had_warnings ();
1220 n_errs = had_errors ();
1221 /* The -Z flag indicates that an object file should be generated,
1222 regardless of warnings and errors. */
1223 if (flag_always_generate_output)
1224 {
1225 if (n_warns || n_errs)
1226 as_warn (_("%d error%s, %d warning%s, generating bad object file"),
1227 n_errs, n_errs == 1 ? "" : "s",
1228 n_warns, n_warns == 1 ? "" : "s");
1229 }
1230 else
1231 {
1232 if (n_errs)
1233 as_fatal (_("%d error%s, %d warning%s, no object file generated"),
1234 n_errs, n_errs == 1 ? "" : "s",
1235 n_warns, n_warns == 1 ? "" : "s");
1236 }
1237 }
1238
1239 #ifdef OBJ_VMS
1240 /* Under VMS we try to be compatible with VAX-11 "C". Thus, we call
1241 a routine to check for the definition of the procedure "_main",
1242 and if so -- fix it up so that it can be program entry point. */
1243 vms_check_for_main ();
1244 #endif /* OBJ_VMS */
1245
1246 /* From now on, we don't care about sub-segments. Build one frag chain
1247 for each segment. Linked thru fr_next. */
1248
1249 /* Remove the sections created by gas for its own purposes. */
1250 {
1251 int i;
1252
1253 bfd_section_list_remove (stdoutput, reg_section);
1254 bfd_section_list_remove (stdoutput, expr_section);
1255 stdoutput->section_count -= 2;
1256 i = 0;
1257 bfd_map_over_sections (stdoutput, renumber_sections, &i);
1258 }
1259
1260 bfd_map_over_sections (stdoutput, chain_frchains_together, (char *) 0);
1261
1262 /* We have two segments. If user gave -R flag, then we must put the
1263 data frags into the text segment. Do this before relaxing so
1264 we know to take advantage of -R and make shorter addresses. */
1265 if (flag_readonly_data_in_text)
1266 {
1267 merge_data_into_text ();
1268 }
1269
1270 rsi.pass = 0;
1271 while (1)
1272 {
1273 #ifndef WORKING_DOT_WORD
1274 /* We need to reset the markers in the broken word list and
1275 associated frags between calls to relax_segment (via
1276 relax_seg). Since the broken word list is global, we do it
1277 once per round, rather than locally in relax_segment for each
1278 segment. */
1279 struct broken_word *brokp;
1280
1281 for (brokp = broken_words;
1282 brokp != (struct broken_word *) NULL;
1283 brokp = brokp->next_broken_word)
1284 {
1285 brokp->added = 0;
1286
1287 if (brokp->dispfrag != (fragS *) NULL
1288 && brokp->dispfrag->fr_type == rs_broken_word)
1289 brokp->dispfrag->fr_subtype = 0;
1290 }
1291 #endif
1292
1293 rsi.changed = 0;
1294 bfd_map_over_sections (stdoutput, relax_seg, &rsi);
1295 rsi.pass++;
1296 if (!rsi.changed)
1297 break;
1298 }
1299
1300 /* Note - Most ports will use the default value of
1301 TC_FINALIZE_SYMS_BEFORE_SIZE_SEG, which 1. This will force
1302 local symbols to be resolved, removing their frag information.
1303 Some ports however, will not have finished relaxing all of
1304 their frags and will still need the local symbol frag
1305 information. These ports can set
1306 TC_FINALIZE_SYMS_BEFORE_SIZE_SEG to 0. */
1307 finalize_syms = TC_FINALIZE_SYMS_BEFORE_SIZE_SEG;
1308
1309 bfd_map_over_sections (stdoutput, size_seg, (char *) 0);
1310
1311 /* Relaxation has completed. Freeze all syms. */
1312 finalize_syms = 1;
1313
1314 #ifdef md_post_relax_hook
1315 md_post_relax_hook;
1316 #endif
1317
1318 #ifndef WORKING_DOT_WORD
1319 {
1320 struct broken_word *lie;
1321 struct broken_word **prevP;
1322
1323 prevP = &broken_words;
1324 for (lie = broken_words; lie; lie = lie->next_broken_word)
1325 if (!lie->added)
1326 {
1327 expressionS exp;
1328
1329 subseg_change (lie->seg, lie->subseg);
1330 exp.X_op = O_subtract;
1331 exp.X_add_symbol = lie->add;
1332 exp.X_op_symbol = lie->sub;
1333 exp.X_add_number = lie->addnum;
1334 #ifdef TC_CONS_FIX_NEW
1335 TC_CONS_FIX_NEW (lie->frag,
1336 lie->word_goes_here - lie->frag->fr_literal,
1337 2, &exp);
1338 #else
1339 fix_new_exp (lie->frag,
1340 lie->word_goes_here - lie->frag->fr_literal,
1341 2, &exp, 0, BFD_RELOC_16);
1342 #endif
1343 *prevP = lie->next_broken_word;
1344 }
1345 else
1346 prevP = &(lie->next_broken_word);
1347
1348 for (lie = broken_words; lie;)
1349 {
1350 struct broken_word *untruth;
1351 char *table_ptr;
1352 addressT table_addr;
1353 addressT from_addr, to_addr;
1354 int n, m;
1355
1356 subseg_change (lie->seg, lie->subseg);
1357 fragP = lie->dispfrag;
1358
1359 /* Find out how many broken_words go here. */
1360 n = 0;
1361 for (untruth = lie;
1362 untruth && untruth->dispfrag == fragP;
1363 untruth = untruth->next_broken_word)
1364 if (untruth->added == 1)
1365 n++;
1366
1367 table_ptr = lie->dispfrag->fr_opcode;
1368 table_addr = (lie->dispfrag->fr_address
1369 + (table_ptr - lie->dispfrag->fr_literal));
1370 /* Create the jump around the long jumps. This is a short
1371 jump from table_ptr+0 to table_ptr+n*long_jump_size. */
1372 from_addr = table_addr;
1373 to_addr = table_addr + md_short_jump_size + n * md_long_jump_size;
1374 md_create_short_jump (table_ptr, from_addr, to_addr, lie->dispfrag,
1375 lie->add);
1376 table_ptr += md_short_jump_size;
1377 table_addr += md_short_jump_size;
1378
1379 for (m = 0;
1380 lie && lie->dispfrag == fragP;
1381 m++, lie = lie->next_broken_word)
1382 {
1383 if (lie->added == 2)
1384 continue;
1385 /* Patch the jump table. */
1386 /* This is the offset from ??? to table_ptr+0. */
1387 to_addr = table_addr - S_GET_VALUE (lie->sub);
1388 #ifdef TC_CHECK_ADJUSTED_BROKEN_DOT_WORD
1389 TC_CHECK_ADJUSTED_BROKEN_DOT_WORD (to_addr, lie);
1390 #endif
1391 md_number_to_chars (lie->word_goes_here, to_addr, 2);
1392 for (untruth = lie->next_broken_word;
1393 untruth && untruth->dispfrag == fragP;
1394 untruth = untruth->next_broken_word)
1395 {
1396 if (untruth->use_jump == lie)
1397 md_number_to_chars (untruth->word_goes_here, to_addr, 2);
1398 }
1399
1400 /* Install the long jump. */
1401 /* This is a long jump from table_ptr+0 to the final target. */
1402 from_addr = table_addr;
1403 to_addr = S_GET_VALUE (lie->add) + lie->addnum;
1404 md_create_long_jump (table_ptr, from_addr, to_addr, lie->dispfrag,
1405 lie->add);
1406 table_ptr += md_long_jump_size;
1407 table_addr += md_long_jump_size;
1408 }
1409 }
1410 }
1411 #endif /* not WORKING_DOT_WORD */
1412
1413 /* Resolve symbol values. This needs to be done before processing
1414 the relocations. */
1415 if (symbol_rootP)
1416 {
1417 symbolS *symp;
1418
1419 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
1420 resolve_symbol_value (symp);
1421 }
1422 resolve_local_symbol_values ();
1423
1424 PROGRESS (1);
1425
1426 #ifdef tc_frob_file_before_adjust
1427 tc_frob_file_before_adjust ();
1428 #endif
1429 #ifdef obj_frob_file_before_adjust
1430 obj_frob_file_before_adjust ();
1431 #endif
1432
1433 bfd_map_over_sections (stdoutput, adjust_reloc_syms, (char *) 0);
1434
1435 #ifdef tc_frob_file_before_fix
1436 tc_frob_file_before_fix ();
1437 #endif
1438 #ifdef obj_frob_file_before_fix
1439 obj_frob_file_before_fix ();
1440 #endif
1441
1442 bfd_map_over_sections (stdoutput, fix_segment, (char *) 0);
1443
1444 /* Set up symbol table, and write it out. */
1445 if (symbol_rootP)
1446 {
1447 symbolS *symp;
1448 bfd_boolean skip_next_symbol = FALSE;
1449
1450 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
1451 {
1452 int punt = 0;
1453 const char *name;
1454
1455 if (skip_next_symbol)
1456 {
1457 /* Don't do anything besides moving the value of the
1458 symbol from the GAS value-field to the BFD value-field. */
1459 symbol_get_bfdsym (symp)->value = S_GET_VALUE (symp);
1460 skip_next_symbol = FALSE;
1461 continue;
1462 }
1463
1464 if (symbol_mri_common_p (symp))
1465 {
1466 if (S_IS_EXTERNAL (symp))
1467 as_bad (_("%s: global symbols not supported in common sections"),
1468 S_GET_NAME (symp));
1469 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
1470 continue;
1471 }
1472
1473 name = S_GET_NAME (symp);
1474 if (name)
1475 {
1476 const char *name2 =
1477 decode_local_label_name ((char *) S_GET_NAME (symp));
1478 /* They only differ if `name' is a fb or dollar local
1479 label name. */
1480 if (name2 != name && ! S_IS_DEFINED (symp))
1481 as_bad (_("local label `%s' is not defined"), name2);
1482 }
1483
1484 /* Do it again, because adjust_reloc_syms might introduce
1485 more symbols. They'll probably only be section symbols,
1486 but they'll still need to have the values computed. */
1487 resolve_symbol_value (symp);
1488
1489 /* Skip symbols which were equated to undefined or common
1490 symbols. */
1491 if (symbol_equated_reloc_p (symp)
1492 || S_IS_WEAKREFR (symp))
1493 {
1494 const char *name = S_GET_NAME (symp);
1495 if (S_IS_COMMON (symp)
1496 && !TC_FAKE_LABEL (name)
1497 && !S_IS_WEAKREFR (symp)
1498 && (!S_IS_EXTERNAL (symp) || S_IS_LOCAL (symp)))
1499 {
1500 expressionS *e = symbol_get_value_expression (symp);
1501 as_bad (_("Local symbol `%s' can't be equated to common symbol `%s'"),
1502 name, S_GET_NAME (e->X_add_symbol));
1503 }
1504 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
1505 continue;
1506 }
1507
1508 #ifdef obj_frob_symbol
1509 obj_frob_symbol (symp, punt);
1510 #endif
1511 #ifdef tc_frob_symbol
1512 if (! punt || symbol_used_in_reloc_p (symp))
1513 tc_frob_symbol (symp, punt);
1514 #endif
1515
1516 /* If we don't want to keep this symbol, splice it out of
1517 the chain now. If EMIT_SECTION_SYMBOLS is 0, we never
1518 want section symbols. Otherwise, we skip local symbols
1519 and symbols that the frob_symbol macros told us to punt,
1520 but we keep such symbols if they are used in relocs. */
1521 if (symp == abs_section_sym
1522 || (! EMIT_SECTION_SYMBOLS
1523 && symbol_section_p (symp))
1524 /* Note that S_IS_EXTERNAL and S_IS_LOCAL are not always
1525 opposites. Sometimes the former checks flags and the
1526 latter examines the name... */
1527 || (!S_IS_EXTERNAL (symp)
1528 && (punt || S_IS_LOCAL (symp) ||
1529 (S_IS_WEAKREFD (symp) && ! symbol_used_p (symp)))
1530 && ! symbol_used_in_reloc_p (symp)))
1531 {
1532 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
1533
1534 /* After symbol_remove, symbol_next(symp) still returns
1535 the one that came after it in the chain. So we don't
1536 need to do any extra cleanup work here. */
1537 continue;
1538 }
1539
1540 /* Make sure we really got a value for the symbol. */
1541 if (! symbol_resolved_p (symp))
1542 {
1543 as_bad (_("can't resolve value for symbol `%s'"),
1544 S_GET_NAME (symp));
1545 symbol_mark_resolved (symp);
1546 }
1547
1548 /* Set the value into the BFD symbol. Up til now the value
1549 has only been kept in the gas symbolS struct. */
1550 symbol_get_bfdsym (symp)->value = S_GET_VALUE (symp);
1551
1552 /* A warning construct is a warning symbol followed by the
1553 symbol warned about. Don't let anything object-format or
1554 target-specific muck with it; it's ready for output. */
1555 if (symbol_get_bfdsym (symp)->flags & BSF_WARNING)
1556 skip_next_symbol = TRUE;
1557 }
1558 }
1559
1560 PROGRESS (1);
1561
1562 /* Now do any format-specific adjustments to the symbol table, such
1563 as adding file symbols. */
1564 #ifdef tc_adjust_symtab
1565 tc_adjust_symtab ();
1566 #endif
1567 #ifdef obj_adjust_symtab
1568 obj_adjust_symtab ();
1569 #endif
1570
1571 /* Now that all the sizes are known, and contents correct, we can
1572 start writing to the file. */
1573 set_symtab ();
1574
1575 /* If *_frob_file changes the symbol value at this point, it is
1576 responsible for moving the changed value into symp->bsym->value
1577 as well. Hopefully all symbol value changing can be done in
1578 *_frob_symbol. */
1579 #ifdef tc_frob_file
1580 tc_frob_file ();
1581 #endif
1582 #ifdef obj_frob_file
1583 obj_frob_file ();
1584 #endif
1585
1586 bfd_map_over_sections (stdoutput, write_relocs, (char *) 0);
1587
1588 #ifdef tc_frob_file_after_relocs
1589 tc_frob_file_after_relocs ();
1590 #endif
1591 #ifdef obj_frob_file_after_relocs
1592 obj_frob_file_after_relocs ();
1593 #endif
1594
1595 bfd_map_over_sections (stdoutput, write_contents, (char *) 0);
1596 }
1597
1598 #ifdef TC_GENERIC_RELAX_TABLE
1599 /* Relax a fragment by scanning TC_GENERIC_RELAX_TABLE. */
1600
1601 long
1602 relax_frag (segT segment, fragS *fragP, long stretch)
1603 {
1604 const relax_typeS *this_type;
1605 const relax_typeS *start_type;
1606 relax_substateT next_state;
1607 relax_substateT this_state;
1608 offsetT growth;
1609 offsetT aim;
1610 addressT target;
1611 addressT address;
1612 symbolS *symbolP;
1613 const relax_typeS *table;
1614
1615 target = fragP->fr_offset;
1616 address = fragP->fr_address;
1617 table = TC_GENERIC_RELAX_TABLE;
1618 this_state = fragP->fr_subtype;
1619 start_type = this_type = table + this_state;
1620 symbolP = fragP->fr_symbol;
1621
1622 if (symbolP)
1623 {
1624 fragS *sym_frag;
1625
1626 sym_frag = symbol_get_frag (symbolP);
1627
1628 #ifndef DIFF_EXPR_OK
1629 know (sym_frag != NULL);
1630 #endif
1631 know (S_GET_SEGMENT (symbolP) != absolute_section
1632 || sym_frag == &zero_address_frag);
1633 target += S_GET_VALUE (symbolP);
1634
1635 /* If frag has yet to be reached on this pass,
1636 assume it will move by STRETCH just as we did.
1637 If this is not so, it will be because some frag
1638 between grows, and that will force another pass. */
1639
1640 if (stretch != 0
1641 && sym_frag->relax_marker != fragP->relax_marker
1642 && S_GET_SEGMENT (symbolP) == segment)
1643 {
1644 target += stretch;
1645 }
1646 }
1647
1648 aim = target - address - fragP->fr_fix;
1649 #ifdef TC_PCREL_ADJUST
1650 /* Currently only the ns32k family needs this. */
1651 aim += TC_PCREL_ADJUST (fragP);
1652 #endif
1653
1654 #ifdef md_prepare_relax_scan
1655 /* Formerly called M68K_AIM_KLUDGE. */
1656 md_prepare_relax_scan (fragP, address, aim, this_state, this_type);
1657 #endif
1658
1659 if (aim < 0)
1660 {
1661 /* Look backwards. */
1662 for (next_state = this_type->rlx_more; next_state;)
1663 if (aim >= this_type->rlx_backward)
1664 next_state = 0;
1665 else
1666 {
1667 /* Grow to next state. */
1668 this_state = next_state;
1669 this_type = table + this_state;
1670 next_state = this_type->rlx_more;
1671 }
1672 }
1673 else
1674 {
1675 /* Look forwards. */
1676 for (next_state = this_type->rlx_more; next_state;)
1677 if (aim <= this_type->rlx_forward)
1678 next_state = 0;
1679 else
1680 {
1681 /* Grow to next state. */
1682 this_state = next_state;
1683 this_type = table + this_state;
1684 next_state = this_type->rlx_more;
1685 }
1686 }
1687
1688 growth = this_type->rlx_length - start_type->rlx_length;
1689 if (growth != 0)
1690 fragP->fr_subtype = this_state;
1691 return growth;
1692 }
1693
1694 #endif /* defined (TC_GENERIC_RELAX_TABLE) */
1695
1696 /* Relax_align. Advance location counter to next address that has 'alignment'
1697 lowest order bits all 0s, return size of adjustment made. */
1698 static relax_addressT
1699 relax_align (register relax_addressT address, /* Address now. */
1700 register int alignment /* Alignment (binary). */)
1701 {
1702 relax_addressT mask;
1703 relax_addressT new_address;
1704
1705 mask = ~((~0) << alignment);
1706 new_address = (address + mask) & (~mask);
1707 #ifdef LINKER_RELAXING_SHRINKS_ONLY
1708 if (linkrelax)
1709 /* We must provide lots of padding, so the linker can discard it
1710 when needed. The linker will not add extra space, ever. */
1711 new_address += (1 << alignment);
1712 #endif
1713 return (new_address - address);
1714 }
1715
1716 /* Now we have a segment, not a crowd of sub-segments, we can make
1717 fr_address values.
1718
1719 Relax the frags.
1720
1721 After this, all frags in this segment have addresses that are correct
1722 within the segment. Since segments live in different file addresses,
1723 these frag addresses may not be the same as final object-file
1724 addresses. */
1725
1726 int
1727 relax_segment (struct frag *segment_frag_root, segT segment, int pass)
1728 {
1729 unsigned long frag_count;
1730 struct frag *fragP;
1731 relax_addressT address;
1732 int ret;
1733
1734 /* In case md_estimate_size_before_relax() wants to make fixSs. */
1735 subseg_change (segment, 0);
1736
1737 /* For each frag in segment: count and store (a 1st guess of)
1738 fr_address. */
1739 address = 0;
1740 for (frag_count = 0, fragP = segment_frag_root;
1741 fragP;
1742 fragP = fragP->fr_next, frag_count ++)
1743 {
1744 fragP->relax_marker = 0;
1745 fragP->fr_address = address;
1746 address += fragP->fr_fix;
1747
1748 switch (fragP->fr_type)
1749 {
1750 case rs_fill:
1751 address += fragP->fr_offset * fragP->fr_var;
1752 break;
1753
1754 case rs_align:
1755 case rs_align_code:
1756 case rs_align_test:
1757 {
1758 addressT offset = relax_align (address, (int) fragP->fr_offset);
1759
1760 if (fragP->fr_subtype != 0 && offset > fragP->fr_subtype)
1761 offset = 0;
1762
1763 if (offset % fragP->fr_var != 0)
1764 {
1765 as_bad_where (fragP->fr_file, fragP->fr_line,
1766 _("alignment padding (%lu bytes) not a multiple of %ld"),
1767 (unsigned long) offset, (long) fragP->fr_var);
1768 offset -= (offset % fragP->fr_var);
1769 }
1770
1771 address += offset;
1772 }
1773 break;
1774
1775 case rs_org:
1776 case rs_space:
1777 /* Assume .org is nugatory. It will grow with 1st relax. */
1778 break;
1779
1780 case rs_machine_dependent:
1781 /* If fr_symbol is an expression, this call to
1782 resolve_symbol_value sets up the correct segment, which will
1783 likely be needed in md_estimate_size_before_relax. */
1784 if (fragP->fr_symbol)
1785 resolve_symbol_value (fragP->fr_symbol);
1786
1787 address += md_estimate_size_before_relax (fragP, segment);
1788 break;
1789
1790 #ifndef WORKING_DOT_WORD
1791 /* Broken words don't concern us yet. */
1792 case rs_broken_word:
1793 break;
1794 #endif
1795
1796 case rs_leb128:
1797 /* Initial guess is always 1; doing otherwise can result in
1798 stable solutions that are larger than the minimum. */
1799 address += fragP->fr_offset = 1;
1800 break;
1801
1802 case rs_cfa:
1803 address += eh_frame_estimate_size_before_relax (fragP);
1804 break;
1805
1806 case rs_dwarf2dbg:
1807 address += dwarf2dbg_estimate_size_before_relax (fragP);
1808 break;
1809
1810 default:
1811 BAD_CASE (fragP->fr_type);
1812 break;
1813 }
1814 }
1815
1816 /* Do relax(). */
1817 {
1818 unsigned long max_iterations;
1819 offsetT stretch; /* May be any size, 0 or negative. */
1820 /* Cumulative number of addresses we have relaxed this pass.
1821 We may have relaxed more than one address. */
1822 int stretched; /* Have we stretched on this pass? */
1823 /* This is 'cuz stretch may be zero, when, in fact some piece of code
1824 grew, and another shrank. If a branch instruction doesn't fit anymore,
1825 we could be scrod. */
1826
1827 /* We want to prevent going into an infinite loop where one frag grows
1828 depending upon the location of a symbol which is in turn moved by
1829 the growing frag. eg:
1830
1831 foo = .
1832 .org foo+16
1833 foo = .
1834
1835 So we dictate that this algorithm can be at most O2. */
1836 max_iterations = frag_count * frag_count;
1837 /* Check for overflow. */
1838 if (max_iterations < frag_count)
1839 max_iterations = frag_count;
1840
1841 ret = 0;
1842 do
1843 {
1844 stretch = 0;
1845 stretched = 0;
1846
1847 for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next)
1848 {
1849 offsetT growth = 0;
1850 addressT was_address;
1851 offsetT offset;
1852 symbolS *symbolP;
1853
1854 fragP->relax_marker ^= 1;
1855 was_address = fragP->fr_address;
1856 address = fragP->fr_address += stretch;
1857 symbolP = fragP->fr_symbol;
1858 offset = fragP->fr_offset;
1859
1860 switch (fragP->fr_type)
1861 {
1862 case rs_fill: /* .fill never relaxes. */
1863 growth = 0;
1864 break;
1865
1866 #ifndef WORKING_DOT_WORD
1867 /* JF: This is RMS's idea. I do *NOT* want to be blamed
1868 for it I do not want to write it. I do not want to have
1869 anything to do with it. This is not the proper way to
1870 implement this misfeature. */
1871 case rs_broken_word:
1872 {
1873 struct broken_word *lie;
1874 struct broken_word *untruth;
1875
1876 /* Yes this is ugly (storing the broken_word pointer
1877 in the symbol slot). Still, this whole chunk of
1878 code is ugly, and I don't feel like doing anything
1879 about it. Think of it as stubbornness in action. */
1880 growth = 0;
1881 for (lie = (struct broken_word *) (fragP->fr_symbol);
1882 lie && lie->dispfrag == fragP;
1883 lie = lie->next_broken_word)
1884 {
1885
1886 if (lie->added)
1887 continue;
1888
1889 offset = (S_GET_VALUE (lie->add)
1890 + lie->addnum
1891 - S_GET_VALUE (lie->sub));
1892 if (offset <= -32768 || offset >= 32767)
1893 {
1894 if (flag_warn_displacement)
1895 {
1896 char buf[50];
1897 sprint_value (buf, (addressT) lie->addnum);
1898 as_warn_where (fragP->fr_file, fragP->fr_line,
1899 _(".word %s-%s+%s didn't fit"),
1900 S_GET_NAME (lie->add),
1901 S_GET_NAME (lie->sub),
1902 buf);
1903 }
1904 lie->added = 1;
1905 if (fragP->fr_subtype == 0)
1906 {
1907 fragP->fr_subtype++;
1908 growth += md_short_jump_size;
1909 }
1910 for (untruth = lie->next_broken_word;
1911 untruth && untruth->dispfrag == lie->dispfrag;
1912 untruth = untruth->next_broken_word)
1913 if ((symbol_get_frag (untruth->add)
1914 == symbol_get_frag (lie->add))
1915 && (S_GET_VALUE (untruth->add)
1916 == S_GET_VALUE (lie->add)))
1917 {
1918 untruth->added = 2;
1919 untruth->use_jump = lie;
1920 }
1921 growth += md_long_jump_size;
1922 }
1923 }
1924
1925 break;
1926 } /* case rs_broken_word */
1927 #endif
1928 case rs_align:
1929 case rs_align_code:
1930 case rs_align_test:
1931 {
1932 addressT oldoff, newoff;
1933
1934 oldoff = relax_align (was_address + fragP->fr_fix,
1935 (int) offset);
1936 newoff = relax_align (address + fragP->fr_fix,
1937 (int) offset);
1938
1939 if (fragP->fr_subtype != 0)
1940 {
1941 if (oldoff > fragP->fr_subtype)
1942 oldoff = 0;
1943 if (newoff > fragP->fr_subtype)
1944 newoff = 0;
1945 }
1946
1947 growth = newoff - oldoff;
1948 }
1949 break;
1950
1951 case rs_org:
1952 {
1953 addressT target = offset;
1954 addressT after;
1955
1956 if (symbolP)
1957 {
1958 /* Convert from an actual address to an octet offset
1959 into the section. Here it is assumed that the
1960 section's VMA is zero, and can omit subtracting it
1961 from the symbol's value to get the address offset. */
1962 know (S_GET_SEGMENT (symbolP)->vma == 0);
1963 target += S_GET_VALUE (symbolP) * OCTETS_PER_BYTE;
1964 }
1965
1966 know (fragP->fr_next);
1967 after = fragP->fr_next->fr_address;
1968 growth = target - after;
1969 if (growth < 0)
1970 {
1971 growth = 0;
1972
1973 /* Don't error on first few frag relax passes.
1974 The symbol might be an expression involving
1975 symbol values from other sections. If those
1976 sections have not yet been processed their
1977 frags will all have zero addresses, so we
1978 will calculate incorrect values for them. The
1979 number of passes we allow before giving an
1980 error is somewhat arbitrary. It should be at
1981 least one, with larger values requiring
1982 increasingly contrived dependencies between
1983 frags to trigger a false error. */
1984 if (pass < 2)
1985 {
1986 /* Force another pass. */
1987 ret = 1;
1988 break;
1989 }
1990
1991 /* Growth may be negative, but variable part of frag
1992 cannot have fewer than 0 chars. That is, we can't
1993 .org backwards. */
1994 as_bad_where (fragP->fr_file, fragP->fr_line,
1995 _("attempt to move .org backwards"));
1996
1997 /* We've issued an error message. Change the
1998 frag to avoid cascading errors. */
1999 fragP->fr_type = rs_align;
2000 fragP->fr_subtype = 0;
2001 fragP->fr_offset = 0;
2002 fragP->fr_fix = after - was_address;
2003 break;
2004 }
2005
2006 /* This is an absolute growth factor */
2007 growth -= stretch;
2008 break;
2009 }
2010
2011 case rs_space:
2012 growth = 0;
2013 if (symbolP)
2014 {
2015 offsetT amount;
2016
2017 amount = S_GET_VALUE (symbolP);
2018 if (S_GET_SEGMENT (symbolP) != absolute_section
2019 || S_IS_COMMON (symbolP)
2020 || ! S_IS_DEFINED (symbolP))
2021 {
2022 as_bad_where (fragP->fr_file, fragP->fr_line,
2023 _(".space specifies non-absolute value"));
2024 /* Prevent repeat of this error message. */
2025 fragP->fr_symbol = 0;
2026 }
2027 else if (amount < 0)
2028 {
2029 /* Don't error on first few frag relax passes.
2030 See rs_org comment for a longer explanation. */
2031 if (pass < 2)
2032 {
2033 ret = 1;
2034 break;
2035 }
2036
2037 as_warn_where (fragP->fr_file, fragP->fr_line,
2038 _(".space or .fill with negative value, ignored"));
2039 fragP->fr_symbol = 0;
2040 }
2041 else
2042 growth = (was_address + fragP->fr_fix + amount
2043 - fragP->fr_next->fr_address);
2044 }
2045 break;
2046
2047 case rs_machine_dependent:
2048 #ifdef md_relax_frag
2049 growth = md_relax_frag (segment, fragP, stretch);
2050 #else
2051 #ifdef TC_GENERIC_RELAX_TABLE
2052 /* The default way to relax a frag is to look through
2053 TC_GENERIC_RELAX_TABLE. */
2054 growth = relax_frag (segment, fragP, stretch);
2055 #endif /* TC_GENERIC_RELAX_TABLE */
2056 #endif
2057 break;
2058
2059 case rs_leb128:
2060 {
2061 valueT value;
2062 offsetT size;
2063
2064 value = resolve_symbol_value (fragP->fr_symbol);
2065 size = sizeof_leb128 (value, fragP->fr_subtype);
2066 growth = size - fragP->fr_offset;
2067 fragP->fr_offset = size;
2068 }
2069 break;
2070
2071 case rs_cfa:
2072 growth = eh_frame_relax_frag (fragP);
2073 break;
2074
2075 case rs_dwarf2dbg:
2076 growth = dwarf2dbg_relax_frag (fragP);
2077 break;
2078
2079 default:
2080 BAD_CASE (fragP->fr_type);
2081 break;
2082 }
2083 if (growth)
2084 {
2085 stretch += growth;
2086 stretched = 1;
2087 }
2088 }
2089 }
2090 /* Until nothing further to relax. */
2091 while (stretched && -- max_iterations);
2092
2093 if (stretched)
2094 as_fatal (_("Infinite loop encountered whilst attempting to compute the addresses of symbols in section %s"),
2095 segment_name (segment));
2096 }
2097
2098 for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next)
2099 if (fragP->last_fr_address != fragP->fr_address)
2100 {
2101 fragP->last_fr_address = fragP->fr_address;
2102 ret = 1;
2103 }
2104 return ret;
2105 }
2106
2107 /* fixup_segment()
2108
2109 Go through all the fixS's in a segment and see which ones can be
2110 handled now. (These consist of fixS where we have since discovered
2111 the value of a symbol, or the address of the frag involved.)
2112 For each one, call md_apply_fix to put the fix into the frag data.
2113
2114 Result is a count of how many relocation structs will be needed to
2115 handle the remaining fixS's that we couldn't completely handle here.
2116 These will be output later by emit_relocations(). */
2117
2118 static long
2119 fixup_segment (fixS *fixP, segT this_segment)
2120 {
2121 long seg_reloc_count = 0;
2122 valueT add_number;
2123 fragS *fragP;
2124 segT add_symbol_segment = absolute_section;
2125
2126 if (fixP != NULL && abs_section_sym == NULL)
2127 abs_section_sym = section_symbol (absolute_section);
2128
2129 /* If the linker is doing the relaxing, we must not do any fixups.
2130
2131 Well, strictly speaking that's not true -- we could do any that
2132 are PC-relative and don't cross regions that could change size.
2133 And for the i960 we might be able to turn callx/callj into bal
2134 anyways in cases where we know the maximum displacement. */
2135 if (linkrelax && TC_LINKRELAX_FIXUP (this_segment))
2136 {
2137 for (; fixP; fixP = fixP->fx_next)
2138 if (!fixP->fx_done)
2139 {
2140 if (fixP->fx_addsy == NULL)
2141 {
2142 /* There was no symbol required by this relocation.
2143 However, BFD doesn't really handle relocations
2144 without symbols well. So fake up a local symbol in
2145 the absolute section. */
2146 fixP->fx_addsy = abs_section_sym;
2147 }
2148 symbol_mark_used_in_reloc (fixP->fx_addsy);
2149 if (fixP->fx_subsy != NULL)
2150 symbol_mark_used_in_reloc (fixP->fx_subsy);
2151 seg_reloc_count++;
2152 }
2153 TC_ADJUST_RELOC_COUNT (fixP, seg_reloc_count);
2154 return seg_reloc_count;
2155 }
2156
2157 for (; fixP; fixP = fixP->fx_next)
2158 {
2159 #ifdef DEBUG5
2160 fprintf (stderr, "\nprocessing fixup:\n");
2161 print_fixup (fixP);
2162 #endif
2163
2164 fragP = fixP->fx_frag;
2165 know (fragP);
2166 #ifdef TC_VALIDATE_FIX
2167 TC_VALIDATE_FIX (fixP, this_segment, skip);
2168 #endif
2169 add_number = fixP->fx_offset;
2170
2171 if (fixP->fx_addsy != NULL
2172 && symbol_mri_common_p (fixP->fx_addsy))
2173 {
2174 add_number += S_GET_VALUE (fixP->fx_addsy);
2175 fixP->fx_offset = add_number;
2176 fixP->fx_addsy
2177 = symbol_get_value_expression (fixP->fx_addsy)->X_add_symbol;
2178 }
2179
2180 if (fixP->fx_addsy != NULL)
2181 add_symbol_segment = S_GET_SEGMENT (fixP->fx_addsy);
2182
2183 if (fixP->fx_subsy != NULL)
2184 {
2185 segT sub_symbol_segment;
2186 resolve_symbol_value (fixP->fx_subsy);
2187 sub_symbol_segment = S_GET_SEGMENT (fixP->fx_subsy);
2188 if (fixP->fx_addsy != NULL
2189 && sub_symbol_segment == add_symbol_segment
2190 && !TC_FORCE_RELOCATION_SUB_SAME (fixP, add_symbol_segment))
2191 {
2192 add_number += S_GET_VALUE (fixP->fx_addsy);
2193 add_number -= S_GET_VALUE (fixP->fx_subsy);
2194 fixP->fx_offset = add_number;
2195 fixP->fx_addsy = NULL;
2196 fixP->fx_subsy = NULL;
2197 #ifdef TC_M68K
2198 /* See the comment below about 68k weirdness. */
2199 fixP->fx_pcrel = 0;
2200 #endif
2201 }
2202 else if (sub_symbol_segment == absolute_section
2203 && !TC_FORCE_RELOCATION_SUB_ABS (fixP))
2204 {
2205 add_number -= S_GET_VALUE (fixP->fx_subsy);
2206 fixP->fx_offset = add_number;
2207 fixP->fx_subsy = NULL;
2208 }
2209 else if (sub_symbol_segment == this_segment
2210 && !TC_FORCE_RELOCATION_SUB_LOCAL (fixP))
2211 {
2212 add_number -= S_GET_VALUE (fixP->fx_subsy);
2213 fixP->fx_offset = (add_number + fixP->fx_dot_value
2214 + fixP->fx_frag->fr_address);
2215
2216 /* Make it pc-relative. If the back-end code has not
2217 selected a pc-relative reloc, cancel the adjustment
2218 we do later on all pc-relative relocs. */
2219 if (0
2220 #ifdef TC_M68K
2221 /* Do this for m68k even if it's already described
2222 as pc-relative. On the m68k, an operand of
2223 "pc@(foo-.-2)" should address "foo" in a
2224 pc-relative mode. */
2225 || 1
2226 #endif
2227 || !fixP->fx_pcrel)
2228 add_number += MD_PCREL_FROM_SECTION (fixP, this_segment);
2229 fixP->fx_subsy = NULL;
2230 fixP->fx_pcrel = 1;
2231 }
2232 else if (!TC_VALIDATE_FIX_SUB (fixP))
2233 {
2234 as_bad_where (fixP->fx_file, fixP->fx_line,
2235 _("can't resolve `%s' {%s section} - `%s' {%s section}"),
2236 fixP->fx_addsy ? S_GET_NAME (fixP->fx_addsy) : "0",
2237 segment_name (add_symbol_segment),
2238 S_GET_NAME (fixP->fx_subsy),
2239 segment_name (sub_symbol_segment));
2240 }
2241 }
2242
2243 if (fixP->fx_addsy)
2244 {
2245 if (add_symbol_segment == this_segment
2246 && !TC_FORCE_RELOCATION_LOCAL (fixP))
2247 {
2248 /* This fixup was made when the symbol's segment was
2249 SEG_UNKNOWN, but it is now in the local segment.
2250 So we know how to do the address without relocation. */
2251 add_number += S_GET_VALUE (fixP->fx_addsy);
2252 fixP->fx_offset = add_number;
2253 if (fixP->fx_pcrel)
2254 add_number -= MD_PCREL_FROM_SECTION (fixP, this_segment);
2255 fixP->fx_addsy = NULL;
2256 fixP->fx_pcrel = 0;
2257 }
2258 else if (add_symbol_segment == absolute_section
2259 && !TC_FORCE_RELOCATION_ABS (fixP))
2260 {
2261 add_number += S_GET_VALUE (fixP->fx_addsy);
2262 fixP->fx_offset = add_number;
2263 fixP->fx_addsy = NULL;
2264 }
2265 else if (add_symbol_segment != undefined_section
2266 && ! bfd_is_com_section (add_symbol_segment)
2267 && MD_APPLY_SYM_VALUE (fixP))
2268 add_number += S_GET_VALUE (fixP->fx_addsy);
2269 }
2270
2271 if (fixP->fx_pcrel)
2272 {
2273 add_number -= MD_PCREL_FROM_SECTION (fixP, this_segment);
2274 if (!fixP->fx_done && fixP->fx_addsy == NULL)
2275 {
2276 /* There was no symbol required by this relocation.
2277 However, BFD doesn't really handle relocations
2278 without symbols well. So fake up a local symbol in
2279 the absolute section. */
2280 fixP->fx_addsy = abs_section_sym;
2281 }
2282 }
2283
2284 if (!fixP->fx_done)
2285 md_apply_fix (fixP, &add_number, this_segment);
2286
2287 if (!fixP->fx_done)
2288 {
2289 ++seg_reloc_count;
2290 if (fixP->fx_addsy == NULL)
2291 fixP->fx_addsy = abs_section_sym;
2292 symbol_mark_used_in_reloc (fixP->fx_addsy);
2293 if (fixP->fx_subsy != NULL)
2294 symbol_mark_used_in_reloc (fixP->fx_subsy);
2295 }
2296
2297 if (!fixP->fx_bit_fixP && !fixP->fx_no_overflow && fixP->fx_size != 0)
2298 {
2299 if (fixP->fx_size < sizeof (valueT))
2300 {
2301 valueT mask;
2302
2303 mask = 0;
2304 mask--; /* Set all bits to one. */
2305 mask <<= fixP->fx_size * 8 - (fixP->fx_signed ? 1 : 0);
2306 if ((add_number & mask) != 0 && (add_number & mask) != mask)
2307 {
2308 char buf[50], buf2[50];
2309 sprint_value (buf, fragP->fr_address + fixP->fx_where);
2310 if (add_number > 1000)
2311 sprint_value (buf2, add_number);
2312 else
2313 sprintf (buf2, "%ld", (long) add_number);
2314 as_bad_where (fixP->fx_file, fixP->fx_line,
2315 _("value of %s too large for field of %d bytes at %s"),
2316 buf2, fixP->fx_size, buf);
2317 } /* Generic error checking. */
2318 }
2319 #ifdef WARN_SIGNED_OVERFLOW_WORD
2320 /* Warn if a .word value is too large when treated as a signed
2321 number. We already know it is not too negative. This is to
2322 catch over-large switches generated by gcc on the 68k. */
2323 if (!flag_signed_overflow_ok
2324 && fixP->fx_size == 2
2325 && add_number > 0x7fff)
2326 as_bad_where (fixP->fx_file, fixP->fx_line,
2327 _("signed .word overflow; switch may be too large; %ld at 0x%lx"),
2328 (long) add_number,
2329 (long) (fragP->fr_address + fixP->fx_where));
2330 #endif
2331 } /* Not a bit fix. */
2332
2333 #ifdef TC_VALIDATE_FIX
2334 skip: ATTRIBUTE_UNUSED_LABEL
2335 ;
2336 #endif
2337 #ifdef DEBUG5
2338 fprintf (stderr, "result:\n");
2339 print_fixup (fixP);
2340 #endif
2341 } /* For each fixS in this segment. */
2342
2343 TC_ADJUST_RELOC_COUNT (fixP, seg_reloc_count);
2344 return seg_reloc_count;
2345 }
2346
2347 void
2348 number_to_chars_bigendian (char *buf, valueT val, int n)
2349 {
2350 if (n <= 0)
2351 abort ();
2352 while (n--)
2353 {
2354 buf[n] = val & 0xff;
2355 val >>= 8;
2356 }
2357 }
2358
2359 void
2360 number_to_chars_littleendian (char *buf, valueT val, int n)
2361 {
2362 if (n <= 0)
2363 abort ();
2364 while (n--)
2365 {
2366 *buf++ = val & 0xff;
2367 val >>= 8;
2368 }
2369 }
2370
2371 void
2372 write_print_statistics (FILE *file)
2373 {
2374 fprintf (file, "fixups: %d\n", n_fixups);
2375 }
2376
2377 /* For debugging. */
2378 extern int indent_level;
2379
2380 void
2381 print_fixup (fixS *fixp)
2382 {
2383 indent_level = 1;
2384 fprintf (stderr, "fix %lx %s:%d", (long) fixp, fixp->fx_file, fixp->fx_line);
2385 if (fixp->fx_pcrel)
2386 fprintf (stderr, " pcrel");
2387 if (fixp->fx_pcrel_adjust)
2388 fprintf (stderr, " pcrel_adjust=%d", fixp->fx_pcrel_adjust);
2389 if (fixp->fx_im_disp)
2390 {
2391 #ifdef TC_NS32K
2392 fprintf (stderr, " im_disp=%d", fixp->fx_im_disp);
2393 #else
2394 fprintf (stderr, " im_disp");
2395 #endif
2396 }
2397 if (fixp->fx_tcbit)
2398 fprintf (stderr, " tcbit");
2399 if (fixp->fx_done)
2400 fprintf (stderr, " done");
2401 fprintf (stderr, "\n size=%d frag=%lx where=%ld offset=%lx addnumber=%lx",
2402 fixp->fx_size, (long) fixp->fx_frag, (long) fixp->fx_where,
2403 (long) fixp->fx_offset, (long) fixp->fx_addnumber);
2404 fprintf (stderr, "\n %s (%d)", bfd_get_reloc_code_name (fixp->fx_r_type),
2405 fixp->fx_r_type);
2406 if (fixp->fx_addsy)
2407 {
2408 fprintf (stderr, "\n +<");
2409 print_symbol_value_1 (stderr, fixp->fx_addsy);
2410 fprintf (stderr, ">");
2411 }
2412 if (fixp->fx_subsy)
2413 {
2414 fprintf (stderr, "\n -<");
2415 print_symbol_value_1 (stderr, fixp->fx_subsy);
2416 fprintf (stderr, ">");
2417 }
2418 fprintf (stderr, "\n");
2419 #ifdef TC_FIX_DATA_PRINT
2420 TC_FIX_DATA_PRINT (stderr, fixp);
2421 #endif
2422 }
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