Make check_for_argument skip whitespace after arg itself
[deliverable/binutils-gdb.git] / gas / write.c
1 /* write.c - emit .o file
2 Copyright (C) 1986-2019 Free Software Foundation, Inc.
3
4 This file is part of GAS, the GNU Assembler.
5
6 GAS is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3, or (at your option)
9 any later version.
10
11 GAS is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with GAS; see the file COPYING. If not, write to the Free
18 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
19 02110-1301, USA. */
20
21 /* This thing should be set up to do byte ordering correctly. But... */
22
23 #include "as.h"
24 #include "subsegs.h"
25 #include "obstack.h"
26 #include "output-file.h"
27 #include "dwarf2dbg.h"
28 #include "compress-debug.h"
29
30 #ifndef TC_FORCE_RELOCATION
31 #define TC_FORCE_RELOCATION(FIX) \
32 (generic_force_reloc (FIX))
33 #endif
34
35 #ifndef TC_FORCE_RELOCATION_ABS
36 #define TC_FORCE_RELOCATION_ABS(FIX) \
37 (TC_FORCE_RELOCATION (FIX))
38 #endif
39
40 #define GENERIC_FORCE_RELOCATION_LOCAL(FIX) \
41 (!(FIX)->fx_pcrel \
42 || TC_FORCE_RELOCATION (FIX))
43 #ifndef TC_FORCE_RELOCATION_LOCAL
44 #define TC_FORCE_RELOCATION_LOCAL GENERIC_FORCE_RELOCATION_LOCAL
45 #endif
46
47 #define GENERIC_FORCE_RELOCATION_SUB_SAME(FIX, SEG) \
48 (!SEG_NORMAL (SEG))
49 #ifndef TC_FORCE_RELOCATION_SUB_SAME
50 #define TC_FORCE_RELOCATION_SUB_SAME GENERIC_FORCE_RELOCATION_SUB_SAME
51 #endif
52
53 #ifndef md_register_arithmetic
54 # define md_register_arithmetic 1
55 #endif
56
57 #ifndef TC_FORCE_RELOCATION_SUB_ABS
58 #define TC_FORCE_RELOCATION_SUB_ABS(FIX, SEG) \
59 (!md_register_arithmetic && (SEG) == reg_section)
60 #endif
61
62 #ifndef TC_FORCE_RELOCATION_SUB_LOCAL
63 #ifdef DIFF_EXPR_OK
64 #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG) \
65 (!md_register_arithmetic && (SEG) == reg_section)
66 #else
67 #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG) 1
68 #endif
69 #endif
70
71 #ifndef TC_VALIDATE_FIX_SUB
72 #ifdef UNDEFINED_DIFFERENCE_OK
73 /* The PA needs this for PIC code generation. */
74 #define TC_VALIDATE_FIX_SUB(FIX, SEG) \
75 (md_register_arithmetic || (SEG) != reg_section)
76 #else
77 #define TC_VALIDATE_FIX_SUB(FIX, SEG) \
78 ((md_register_arithmetic || (SEG) != reg_section) \
79 && ((FIX)->fx_r_type == BFD_RELOC_GPREL32 \
80 || (FIX)->fx_r_type == BFD_RELOC_GPREL16))
81 #endif
82 #endif
83
84 #ifndef TC_LINKRELAX_FIXUP
85 #define TC_LINKRELAX_FIXUP(SEG) 1
86 #endif
87
88 #ifndef MD_APPLY_SYM_VALUE
89 #define MD_APPLY_SYM_VALUE(FIX) 1
90 #endif
91
92 #ifndef TC_FINALIZE_SYMS_BEFORE_SIZE_SEG
93 #define TC_FINALIZE_SYMS_BEFORE_SIZE_SEG 1
94 #endif
95
96 #ifndef MD_PCREL_FROM_SECTION
97 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from (FIX)
98 #endif
99
100 #ifndef TC_FAKE_LABEL
101 #define TC_FAKE_LABEL(NAME) (strcmp ((NAME), FAKE_LABEL_NAME) == 0)
102 #endif
103
104 /* Positive values of TC_FX_SIZE_SLACK allow a target to define
105 fixups that far past the end of a frag. Having such fixups
106 is of course most most likely a bug in setting fx_size correctly.
107 A negative value disables the fixup check entirely, which is
108 appropriate for something like the Renesas / SuperH SH_COUNT
109 reloc. */
110 #ifndef TC_FX_SIZE_SLACK
111 #define TC_FX_SIZE_SLACK(FIX) 0
112 #endif
113
114 /* Used to control final evaluation of expressions. */
115 int finalize_syms = 0;
116
117 int symbol_table_frozen;
118
119 symbolS *abs_section_sym;
120
121 /* Remember the value of dot when parsing expressions. */
122 addressT dot_value;
123
124 /* The frag that dot_value is based from. */
125 fragS *dot_frag;
126
127 /* Relocs generated by ".reloc" pseudo. */
128 struct reloc_list* reloc_list;
129
130 void print_fixup (fixS *);
131
132 /* We generally attach relocs to frag chains. However, after we have
133 chained these all together into a segment, any relocs we add after
134 that must be attached to a segment. This will include relocs added
135 in md_estimate_size_for_relax, for example. */
136 static int frags_chained = 0;
137
138 static int n_fixups;
139
140 #define RELOC_ENUM enum bfd_reloc_code_real
141
142 /* Create a fixS in obstack 'notes'. */
143
144 static fixS *
145 fix_new_internal (fragS *frag, /* Which frag? */
146 unsigned long where, /* Where in that frag? */
147 unsigned long size, /* 1, 2, or 4 usually. */
148 symbolS *add_symbol, /* X_add_symbol. */
149 symbolS *sub_symbol, /* X_op_symbol. */
150 offsetT offset, /* X_add_number. */
151 int pcrel, /* TRUE if PC-relative relocation. */
152 RELOC_ENUM r_type /* Relocation type. */,
153 int at_beginning) /* Add to the start of the list? */
154 {
155 fixS *fixP;
156
157 n_fixups++;
158
159 fixP = (fixS *) obstack_alloc (&notes, sizeof (fixS));
160
161 fixP->fx_frag = frag;
162 fixP->fx_where = where;
163 fixP->fx_size = size;
164 /* We've made fx_size a narrow field; check that it's wide enough. */
165 if (fixP->fx_size != size)
166 {
167 as_bad (_("field fx_size too small to hold %lu"), size);
168 abort ();
169 }
170 fixP->fx_addsy = add_symbol;
171 fixP->fx_subsy = sub_symbol;
172 fixP->fx_offset = offset;
173 fixP->fx_dot_value = dot_value;
174 fixP->fx_dot_frag = dot_frag;
175 fixP->fx_pcrel = pcrel;
176 fixP->fx_r_type = r_type;
177 fixP->fx_pcrel_adjust = 0;
178 fixP->fx_addnumber = 0;
179 fixP->fx_tcbit = 0;
180 fixP->fx_tcbit2 = 0;
181 fixP->fx_done = 0;
182 fixP->fx_no_overflow = 0;
183 fixP->fx_signed = 0;
184
185 #ifdef USING_CGEN
186 fixP->fx_cgen.insn = NULL;
187 fixP->fx_cgen.opinfo = 0;
188 #endif
189
190 #ifdef TC_FIX_TYPE
191 TC_INIT_FIX_DATA (fixP);
192 #endif
193
194 fixP->fx_file = as_where (&fixP->fx_line);
195
196 {
197
198 fixS **seg_fix_rootP = (frags_chained
199 ? &seg_info (now_seg)->fix_root
200 : &frchain_now->fix_root);
201 fixS **seg_fix_tailP = (frags_chained
202 ? &seg_info (now_seg)->fix_tail
203 : &frchain_now->fix_tail);
204
205 if (at_beginning)
206 {
207 fixP->fx_next = *seg_fix_rootP;
208 *seg_fix_rootP = fixP;
209 if (fixP->fx_next == NULL)
210 *seg_fix_tailP = fixP;
211 }
212 else
213 {
214 fixP->fx_next = NULL;
215 if (*seg_fix_tailP)
216 (*seg_fix_tailP)->fx_next = fixP;
217 else
218 *seg_fix_rootP = fixP;
219 *seg_fix_tailP = fixP;
220 }
221 }
222
223 return fixP;
224 }
225
226 /* Create a fixup relative to a symbol (plus a constant). */
227
228 fixS *
229 fix_new (fragS *frag, /* Which frag? */
230 unsigned long where, /* Where in that frag? */
231 unsigned long size, /* 1, 2, or 4 usually. */
232 symbolS *add_symbol, /* X_add_symbol. */
233 offsetT offset, /* X_add_number. */
234 int pcrel, /* TRUE if PC-relative relocation. */
235 RELOC_ENUM r_type /* Relocation type. */)
236 {
237 return fix_new_internal (frag, where, size, add_symbol,
238 (symbolS *) NULL, offset, pcrel, r_type, FALSE);
239 }
240
241 /* Create a fixup for an expression. Currently we only support fixups
242 for difference expressions. That is itself more than most object
243 file formats support anyhow. */
244
245 fixS *
246 fix_new_exp (fragS *frag, /* Which frag? */
247 unsigned long where, /* Where in that frag? */
248 unsigned long size, /* 1, 2, or 4 usually. */
249 expressionS *exp, /* Expression. */
250 int pcrel, /* TRUE if PC-relative relocation. */
251 RELOC_ENUM r_type /* Relocation type. */)
252 {
253 symbolS *add = NULL;
254 symbolS *sub = NULL;
255 offsetT off = 0;
256
257 switch (exp->X_op)
258 {
259 case O_absent:
260 break;
261
262 case O_register:
263 as_bad (_("register value used as expression"));
264 break;
265
266 case O_add:
267 /* This comes up when _GLOBAL_OFFSET_TABLE_+(.-L0) is read, if
268 the difference expression cannot immediately be reduced. */
269 {
270 symbolS *stmp = make_expr_symbol (exp);
271
272 exp->X_op = O_symbol;
273 exp->X_op_symbol = 0;
274 exp->X_add_symbol = stmp;
275 exp->X_add_number = 0;
276
277 return fix_new_exp (frag, where, size, exp, pcrel, r_type);
278 }
279
280 case O_symbol_rva:
281 add = exp->X_add_symbol;
282 off = exp->X_add_number;
283 r_type = BFD_RELOC_RVA;
284 break;
285
286 case O_uminus:
287 sub = exp->X_add_symbol;
288 off = exp->X_add_number;
289 break;
290
291 case O_subtract:
292 sub = exp->X_op_symbol;
293 /* Fall through. */
294 case O_symbol:
295 add = exp->X_add_symbol;
296 /* Fall through. */
297 case O_constant:
298 off = exp->X_add_number;
299 break;
300
301 default:
302 add = make_expr_symbol (exp);
303 break;
304 }
305
306 return fix_new_internal (frag, where, size, add, sub, off, pcrel,
307 r_type, FALSE);
308 }
309
310 /* Create a fixup at the beginning of FRAG. The arguments are the same
311 as for fix_new, except that WHERE is implicitly 0. */
312
313 fixS *
314 fix_at_start (fragS *frag, unsigned long size, symbolS *add_symbol,
315 offsetT offset, int pcrel, RELOC_ENUM r_type)
316 {
317 return fix_new_internal (frag, 0, size, add_symbol,
318 (symbolS *) NULL, offset, pcrel, r_type, TRUE);
319 }
320
321 /* Generic function to determine whether a fixup requires a relocation. */
322 int
323 generic_force_reloc (fixS *fix)
324 {
325 if (fix->fx_r_type == BFD_RELOC_VTABLE_INHERIT
326 || fix->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
327 return 1;
328
329 if (fix->fx_addsy == NULL)
330 return 0;
331
332 return S_FORCE_RELOC (fix->fx_addsy, fix->fx_subsy == NULL);
333 }
334
335 /* Append a string onto another string, bumping the pointer along. */
336 void
337 append (char **charPP, char *fromP, unsigned long length)
338 {
339 /* Don't trust memcpy() of 0 chars. */
340 if (length == 0)
341 return;
342
343 memcpy (*charPP, fromP, length);
344 *charPP += length;
345 }
346
347 /* This routine records the largest alignment seen for each segment.
348 If the beginning of the segment is aligned on the worst-case
349 boundary, all of the other alignments within it will work. At
350 least one object format really uses this info. */
351
352 void
353 record_alignment (/* Segment to which alignment pertains. */
354 segT seg,
355 /* Alignment, as a power of 2 (e.g., 1 => 2-byte
356 boundary, 2 => 4-byte boundary, etc.) */
357 unsigned int align)
358 {
359 if (seg == absolute_section)
360 return;
361
362 if (align > bfd_get_section_alignment (stdoutput, seg))
363 bfd_set_section_alignment (stdoutput, seg, align);
364 }
365
366 int
367 get_recorded_alignment (segT seg)
368 {
369 if (seg == absolute_section)
370 return 0;
371
372 return bfd_get_section_alignment (stdoutput, seg);
373 }
374
375 /* Reset the section indices after removing the gas created sections. */
376
377 static void
378 renumber_sections (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *countparg)
379 {
380 int *countp = (int *) countparg;
381
382 sec->index = *countp;
383 ++*countp;
384 }
385
386 static fragS *
387 chain_frchains_together_1 (segT section, struct frchain *frchp)
388 {
389 fragS dummy, *prev_frag = &dummy;
390 fixS fix_dummy, *prev_fix = &fix_dummy;
391
392 for (; frchp; frchp = frchp->frch_next)
393 {
394 prev_frag->fr_next = frchp->frch_root;
395 prev_frag = frchp->frch_last;
396 gas_assert (prev_frag->fr_type != 0);
397 if (frchp->fix_root != (fixS *) NULL)
398 {
399 if (seg_info (section)->fix_root == (fixS *) NULL)
400 seg_info (section)->fix_root = frchp->fix_root;
401 prev_fix->fx_next = frchp->fix_root;
402 seg_info (section)->fix_tail = frchp->fix_tail;
403 prev_fix = frchp->fix_tail;
404 }
405 }
406 gas_assert (prev_frag != &dummy
407 && prev_frag->fr_type != 0);
408 prev_frag->fr_next = 0;
409 return prev_frag;
410 }
411
412 static void
413 chain_frchains_together (bfd *abfd ATTRIBUTE_UNUSED,
414 segT section,
415 void *xxx ATTRIBUTE_UNUSED)
416 {
417 segment_info_type *info;
418
419 /* BFD may have introduced its own sections without using
420 subseg_new, so it is possible that seg_info is NULL. */
421 info = seg_info (section);
422 if (info != (segment_info_type *) NULL)
423 info->frchainP->frch_last
424 = chain_frchains_together_1 (section, info->frchainP);
425
426 /* Now that we've chained the frags together, we must add new fixups
427 to the segment, not to the frag chain. */
428 frags_chained = 1;
429 }
430
431 static void
432 cvt_frag_to_fill (segT sec ATTRIBUTE_UNUSED, fragS *fragP)
433 {
434 switch (fragP->fr_type)
435 {
436 case rs_space_nop:
437 goto skip_align;
438 case rs_align:
439 case rs_align_code:
440 case rs_align_test:
441 case rs_org:
442 case rs_space:
443 #ifdef HANDLE_ALIGN
444 HANDLE_ALIGN (fragP);
445 #endif
446 skip_align:
447 know (fragP->fr_next != NULL);
448 fragP->fr_offset = (fragP->fr_next->fr_address
449 - fragP->fr_address
450 - fragP->fr_fix) / fragP->fr_var;
451 if (fragP->fr_offset < 0)
452 {
453 as_bad_where (fragP->fr_file, fragP->fr_line,
454 _("attempt to .org/.space/.nops backwards? (%ld)"),
455 (long) fragP->fr_offset);
456 fragP->fr_offset = 0;
457 }
458 if (fragP->fr_type == rs_space_nop)
459 fragP->fr_type = rs_fill_nop;
460 else
461 fragP->fr_type = rs_fill;
462 break;
463
464 case rs_fill:
465 case rs_fill_nop:
466 break;
467
468 case rs_leb128:
469 {
470 valueT value = S_GET_VALUE (fragP->fr_symbol);
471 int size;
472
473 if (!S_IS_DEFINED (fragP->fr_symbol))
474 {
475 as_bad_where (fragP->fr_file, fragP->fr_line,
476 _("leb128 operand is an undefined symbol: %s"),
477 S_GET_NAME (fragP->fr_symbol));
478 }
479
480 size = output_leb128 (fragP->fr_literal + fragP->fr_fix, value,
481 fragP->fr_subtype);
482
483 fragP->fr_fix += size;
484 fragP->fr_type = rs_fill;
485 fragP->fr_var = 0;
486 fragP->fr_offset = 0;
487 fragP->fr_symbol = NULL;
488 }
489 break;
490
491 case rs_cfa:
492 eh_frame_convert_frag (fragP);
493 break;
494
495 case rs_dwarf2dbg:
496 dwarf2dbg_convert_frag (fragP);
497 break;
498
499 case rs_machine_dependent:
500 md_convert_frag (stdoutput, sec, fragP);
501
502 gas_assert (fragP->fr_next == NULL
503 || (fragP->fr_next->fr_address - fragP->fr_address
504 == fragP->fr_fix));
505
506 /* After md_convert_frag, we make the frag into a ".space 0".
507 md_convert_frag() should set up any fixSs and constants
508 required. */
509 frag_wane (fragP);
510 break;
511
512 #ifndef WORKING_DOT_WORD
513 case rs_broken_word:
514 {
515 struct broken_word *lie;
516
517 if (fragP->fr_subtype)
518 {
519 fragP->fr_fix += md_short_jump_size;
520 for (lie = (struct broken_word *) (fragP->fr_symbol);
521 lie && lie->dispfrag == fragP;
522 lie = lie->next_broken_word)
523 if (lie->added == 1)
524 fragP->fr_fix += md_long_jump_size;
525 }
526 frag_wane (fragP);
527 }
528 break;
529 #endif
530
531 default:
532 BAD_CASE (fragP->fr_type);
533 break;
534 }
535 #ifdef md_frag_check
536 md_frag_check (fragP);
537 #endif
538 }
539
540 struct relax_seg_info
541 {
542 int pass;
543 int changed;
544 };
545
546 static void
547 relax_seg (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *xxx)
548 {
549 segment_info_type *seginfo = seg_info (sec);
550 struct relax_seg_info *info = (struct relax_seg_info *) xxx;
551
552 if (seginfo && seginfo->frchainP
553 && relax_segment (seginfo->frchainP->frch_root, sec, info->pass))
554 info->changed = 1;
555 }
556
557 static void
558 size_seg (bfd *abfd, asection *sec, void *xxx ATTRIBUTE_UNUSED)
559 {
560 flagword flags;
561 fragS *fragp;
562 segment_info_type *seginfo;
563 int x;
564 valueT size, newsize;
565
566 subseg_change (sec, 0);
567
568 seginfo = seg_info (sec);
569 if (seginfo && seginfo->frchainP)
570 {
571 for (fragp = seginfo->frchainP->frch_root; fragp; fragp = fragp->fr_next)
572 cvt_frag_to_fill (sec, fragp);
573 for (fragp = seginfo->frchainP->frch_root;
574 fragp->fr_next;
575 fragp = fragp->fr_next)
576 /* Walk to last elt. */
577 ;
578 size = fragp->fr_address + fragp->fr_fix;
579 }
580 else
581 size = 0;
582
583 flags = bfd_get_section_flags (abfd, sec);
584 if (size == 0 && bfd_get_section_size (sec) != 0 &&
585 (flags & SEC_HAS_CONTENTS) != 0)
586 return;
587
588 if (size > 0 && ! seginfo->bss)
589 flags |= SEC_HAS_CONTENTS;
590
591 flags &= ~SEC_RELOC;
592 x = bfd_set_section_flags (abfd, sec, flags);
593 gas_assert (x);
594
595 /* If permitted, allow the backend to pad out the section
596 to some alignment boundary. */
597 if (do_not_pad_sections_to_alignment)
598 newsize = size;
599 else
600 newsize = md_section_align (sec, size);
601 x = bfd_set_section_size (abfd, sec, newsize);
602 gas_assert (x);
603
604 /* If the size had to be rounded up, add some padding in the last
605 non-empty frag. */
606 gas_assert (newsize >= size);
607 if (size != newsize)
608 {
609 fragS *last = seginfo->frchainP->frch_last;
610 fragp = seginfo->frchainP->frch_root;
611 while (fragp->fr_next != last)
612 fragp = fragp->fr_next;
613 last->fr_address = size;
614 if ((newsize - size) % fragp->fr_var == 0)
615 fragp->fr_offset += (newsize - size) / fragp->fr_var;
616 else
617 /* If we hit this abort, it's likely due to subsegs_finish not
618 providing sufficient alignment on the last frag, and the
619 machine dependent code using alignment frags with fr_var
620 greater than 1. */
621 abort ();
622 }
623
624 #ifdef tc_frob_section
625 tc_frob_section (sec);
626 #endif
627 #ifdef obj_frob_section
628 obj_frob_section (sec);
629 #endif
630 }
631
632 #ifdef DEBUG2
633 static void
634 dump_section_relocs (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, FILE *stream)
635 {
636 segment_info_type *seginfo = seg_info (sec);
637 fixS *fixp = seginfo->fix_root;
638
639 if (!fixp)
640 return;
641
642 fprintf (stream, "sec %s relocs:\n", sec->name);
643 while (fixp)
644 {
645 symbolS *s = fixp->fx_addsy;
646
647 fprintf (stream, " %08lx: type %d ", (unsigned long) fixp,
648 (int) fixp->fx_r_type);
649 if (s == NULL)
650 fprintf (stream, "no sym\n");
651 else
652 {
653 print_symbol_value_1 (stream, s);
654 fprintf (stream, "\n");
655 }
656 fixp = fixp->fx_next;
657 }
658 }
659 #else
660 #define dump_section_relocs(ABFD,SEC,STREAM) ((void) 0)
661 #endif
662
663 #ifndef EMIT_SECTION_SYMBOLS
664 #define EMIT_SECTION_SYMBOLS 1
665 #endif
666
667 /* Resolve U.A.OFFSET_SYM and U.A.SYM fields of RELOC_LIST entries,
668 and check for validity. Convert RELOC_LIST from using U.A fields
669 to U.B fields. */
670 static void
671 resolve_reloc_expr_symbols (void)
672 {
673 bfd_vma addr_mask = 1;
674 struct reloc_list *r;
675
676 /* Avoid a shift by the width of type. */
677 addr_mask <<= bfd_arch_bits_per_address (stdoutput) - 1;
678 addr_mask <<= 1;
679 addr_mask -= 1;
680
681 for (r = reloc_list; r; r = r->next)
682 {
683 reloc_howto_type *howto = r->u.a.howto;
684 expressionS *symval;
685 symbolS *sym;
686 bfd_vma offset, addend;
687 asection *sec;
688
689 resolve_symbol_value (r->u.a.offset_sym);
690 symval = symbol_get_value_expression (r->u.a.offset_sym);
691
692 offset = 0;
693 sym = NULL;
694 if (symval->X_op == O_constant)
695 sym = r->u.a.offset_sym;
696 else if (symval->X_op == O_symbol)
697 {
698 sym = symval->X_add_symbol;
699 offset = symval->X_add_number;
700 symval = symbol_get_value_expression (symval->X_add_symbol);
701 }
702 if (sym == NULL
703 || symval->X_op != O_constant
704 || (sec = S_GET_SEGMENT (sym)) == NULL
705 || !SEG_NORMAL (sec))
706 {
707 as_bad_where (r->file, r->line, _("invalid offset expression"));
708 sec = NULL;
709 }
710 else
711 offset += S_GET_VALUE (sym);
712
713 sym = NULL;
714 addend = r->u.a.addend;
715 if (r->u.a.sym != NULL)
716 {
717 resolve_symbol_value (r->u.a.sym);
718 symval = symbol_get_value_expression (r->u.a.sym);
719 if (symval->X_op == O_constant)
720 sym = r->u.a.sym;
721 else if (symval->X_op == O_symbol)
722 {
723 sym = symval->X_add_symbol;
724 addend += symval->X_add_number;
725 symval = symbol_get_value_expression (symval->X_add_symbol);
726 }
727 if (symval->X_op != O_constant)
728 {
729 as_bad_where (r->file, r->line, _("invalid reloc expression"));
730 sec = NULL;
731 }
732 else if (sym != NULL && sec != NULL)
733 {
734 /* Convert relocs against local symbols to refer to the
735 corresponding section symbol plus offset instead. Keep
736 PC-relative relocs of the REL variety intact though to
737 prevent the offset from overflowing the relocated field,
738 unless it has enough bits to cover the whole address
739 space. */
740 if (S_IS_LOCAL (sym) && !symbol_section_p (sym)
741 && (sec->use_rela_p
742 || (howto->partial_inplace
743 && (!howto->pc_relative
744 || howto->src_mask == addr_mask))))
745 {
746 asection *symsec = S_GET_SEGMENT (sym);
747 if (!(((symsec->flags & SEC_MERGE) != 0
748 && addend != 0)
749 || (symsec->flags & SEC_THREAD_LOCAL) != 0))
750 {
751 addend += S_GET_VALUE (sym);
752 sym = section_symbol (symsec);
753 }
754 }
755 symbol_mark_used_in_reloc (sym);
756 }
757 }
758 if (sym == NULL)
759 {
760 if (abs_section_sym == NULL)
761 abs_section_sym = section_symbol (absolute_section);
762 sym = abs_section_sym;
763 }
764
765 r->u.b.sec = sec;
766 r->u.b.s = symbol_get_bfdsym (sym);
767 r->u.b.r.sym_ptr_ptr = &r->u.b.s;
768 r->u.b.r.address = offset;
769 r->u.b.r.addend = addend;
770 r->u.b.r.howto = howto;
771 }
772 }
773
774 /* This pass over fixups decides whether symbols can be replaced with
775 section symbols. */
776
777 static void
778 adjust_reloc_syms (bfd *abfd ATTRIBUTE_UNUSED,
779 asection *sec,
780 void *xxx ATTRIBUTE_UNUSED)
781 {
782 segment_info_type *seginfo = seg_info (sec);
783 fixS *fixp;
784
785 if (seginfo == NULL)
786 return;
787
788 dump_section_relocs (abfd, sec, stderr);
789
790 for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next)
791 if (fixp->fx_done)
792 /* Ignore it. */
793 ;
794 else if (fixp->fx_addsy)
795 {
796 symbolS *sym;
797 asection *symsec;
798
799 #ifdef DEBUG5
800 fprintf (stderr, "\n\nadjusting fixup:\n");
801 print_fixup (fixp);
802 #endif
803
804 sym = fixp->fx_addsy;
805
806 /* All symbols should have already been resolved at this
807 point. It is possible to see unresolved expression
808 symbols, though, since they are not in the regular symbol
809 table. */
810 resolve_symbol_value (sym);
811
812 if (fixp->fx_subsy != NULL)
813 resolve_symbol_value (fixp->fx_subsy);
814
815 /* If this symbol is equated to an undefined or common symbol,
816 convert the fixup to being against that symbol. */
817 while (symbol_equated_reloc_p (sym)
818 || S_IS_WEAKREFR (sym))
819 {
820 symbolS *newsym = symbol_get_value_expression (sym)->X_add_symbol;
821 if (sym == newsym)
822 break;
823 fixp->fx_offset += symbol_get_value_expression (sym)->X_add_number;
824 fixp->fx_addsy = newsym;
825 sym = newsym;
826 }
827
828 if (symbol_mri_common_p (sym))
829 {
830 fixp->fx_offset += S_GET_VALUE (sym);
831 fixp->fx_addsy = symbol_get_value_expression (sym)->X_add_symbol;
832 continue;
833 }
834
835 /* If the symbol is undefined, common, weak, or global (ELF
836 shared libs), we can't replace it with the section symbol. */
837 if (S_FORCE_RELOC (fixp->fx_addsy, 1))
838 continue;
839
840 /* Is there some other (target cpu dependent) reason we can't adjust
841 this one? (E.g. relocations involving function addresses on
842 the PA. */
843 #ifdef tc_fix_adjustable
844 if (! tc_fix_adjustable (fixp))
845 continue;
846 #endif
847
848 /* Since we're reducing to section symbols, don't attempt to reduce
849 anything that's already using one. */
850 if (symbol_section_p (sym))
851 continue;
852
853 symsec = S_GET_SEGMENT (sym);
854 if (symsec == NULL)
855 abort ();
856
857 if (bfd_is_abs_section (symsec)
858 || symsec == reg_section)
859 {
860 /* The fixup_segment routine normally will not use this
861 symbol in a relocation. */
862 continue;
863 }
864
865 /* Don't try to reduce relocs which refer to non-local symbols
866 in .linkonce sections. It can lead to confusion when a
867 debugging section refers to a .linkonce section. I hope
868 this will always be correct. */
869 if (symsec != sec && ! S_IS_LOCAL (sym))
870 {
871 if ((symsec->flags & SEC_LINK_ONCE) != 0
872 || (IS_ELF
873 /* The GNU toolchain uses an extension for ELF: a
874 section beginning with the magic string
875 .gnu.linkonce is a linkonce section. */
876 && strncmp (segment_name (symsec), ".gnu.linkonce",
877 sizeof ".gnu.linkonce" - 1) == 0))
878 continue;
879 }
880
881 /* Never adjust a reloc against local symbol in a merge section
882 with non-zero addend. */
883 if ((symsec->flags & SEC_MERGE) != 0
884 && (fixp->fx_offset != 0 || fixp->fx_subsy != NULL))
885 continue;
886
887 /* Never adjust a reloc against TLS local symbol. */
888 if ((symsec->flags & SEC_THREAD_LOCAL) != 0)
889 continue;
890
891 /* We refetch the segment when calling section_symbol, rather
892 than using symsec, because S_GET_VALUE may wind up changing
893 the section when it calls resolve_symbol_value. */
894 fixp->fx_offset += S_GET_VALUE (sym);
895 fixp->fx_addsy = section_symbol (S_GET_SEGMENT (sym));
896 #ifdef DEBUG5
897 fprintf (stderr, "\nadjusted fixup:\n");
898 print_fixup (fixp);
899 #endif
900 }
901
902 dump_section_relocs (abfd, sec, stderr);
903 }
904
905 /* fixup_segment()
906
907 Go through all the fixS's in a segment and see which ones can be
908 handled now. (These consist of fixS where we have since discovered
909 the value of a symbol, or the address of the frag involved.)
910 For each one, call md_apply_fix to put the fix into the frag data.
911 Ones that we couldn't completely handle here will be output later
912 by emit_relocations. */
913
914 static void
915 fixup_segment (fixS *fixP, segT this_segment)
916 {
917 valueT add_number;
918 fragS *fragP;
919 segT add_symbol_segment = absolute_section;
920
921 if (fixP != NULL && abs_section_sym == NULL)
922 abs_section_sym = section_symbol (absolute_section);
923
924 /* If the linker is doing the relaxing, we must not do any fixups.
925
926 Well, strictly speaking that's not true -- we could do any that
927 are PC-relative and don't cross regions that could change size. */
928 if (linkrelax && TC_LINKRELAX_FIXUP (this_segment))
929 {
930 for (; fixP; fixP = fixP->fx_next)
931 if (!fixP->fx_done)
932 {
933 if (fixP->fx_addsy == NULL)
934 {
935 /* There was no symbol required by this relocation.
936 However, BFD doesn't really handle relocations
937 without symbols well. So fake up a local symbol in
938 the absolute section. */
939 fixP->fx_addsy = abs_section_sym;
940 }
941 symbol_mark_used_in_reloc (fixP->fx_addsy);
942 if (fixP->fx_subsy != NULL)
943 symbol_mark_used_in_reloc (fixP->fx_subsy);
944 }
945 return;
946 }
947
948 for (; fixP; fixP = fixP->fx_next)
949 {
950 #ifdef DEBUG5
951 fprintf (stderr, "\nprocessing fixup:\n");
952 print_fixup (fixP);
953 #endif
954
955 fragP = fixP->fx_frag;
956 know (fragP);
957 #ifdef TC_VALIDATE_FIX
958 TC_VALIDATE_FIX (fixP, this_segment, skip);
959 #endif
960 add_number = fixP->fx_offset;
961
962 if (fixP->fx_addsy != NULL)
963 add_symbol_segment = S_GET_SEGMENT (fixP->fx_addsy);
964
965 if (fixP->fx_subsy != NULL)
966 {
967 segT sub_symbol_segment;
968 resolve_symbol_value (fixP->fx_subsy);
969 sub_symbol_segment = S_GET_SEGMENT (fixP->fx_subsy);
970 if (fixP->fx_addsy != NULL
971 && sub_symbol_segment == add_symbol_segment
972 && !S_FORCE_RELOC (fixP->fx_addsy, 0)
973 && !S_FORCE_RELOC (fixP->fx_subsy, 0)
974 && !TC_FORCE_RELOCATION_SUB_SAME (fixP, add_symbol_segment))
975 {
976 add_number += S_GET_VALUE (fixP->fx_addsy);
977 add_number -= S_GET_VALUE (fixP->fx_subsy);
978 fixP->fx_offset = add_number;
979 fixP->fx_addsy = NULL;
980 fixP->fx_subsy = NULL;
981 #ifdef TC_M68K
982 /* See the comment below about 68k weirdness. */
983 fixP->fx_pcrel = 0;
984 #endif
985 }
986 else if (sub_symbol_segment == absolute_section
987 && !S_FORCE_RELOC (fixP->fx_subsy, 0)
988 && !TC_FORCE_RELOCATION_SUB_ABS (fixP, add_symbol_segment))
989 {
990 add_number -= S_GET_VALUE (fixP->fx_subsy);
991 fixP->fx_offset = add_number;
992 fixP->fx_subsy = NULL;
993 }
994 else if (sub_symbol_segment == this_segment
995 && !S_FORCE_RELOC (fixP->fx_subsy, 0)
996 && !TC_FORCE_RELOCATION_SUB_LOCAL (fixP, add_symbol_segment))
997 {
998 add_number -= S_GET_VALUE (fixP->fx_subsy);
999 fixP->fx_offset = (add_number + fixP->fx_dot_value
1000 + fixP->fx_dot_frag->fr_address);
1001
1002 /* Make it pc-relative. If the back-end code has not
1003 selected a pc-relative reloc, cancel the adjustment
1004 we do later on all pc-relative relocs. */
1005 if (0
1006 #ifdef TC_M68K
1007 /* Do this for m68k even if it's already described
1008 as pc-relative. On the m68k, an operand of
1009 "pc@(foo-.-2)" should address "foo" in a
1010 pc-relative mode. */
1011 || 1
1012 #endif
1013 || !fixP->fx_pcrel)
1014 add_number += MD_PCREL_FROM_SECTION (fixP, this_segment);
1015 fixP->fx_subsy = NULL;
1016 fixP->fx_pcrel = 1;
1017 }
1018 else if (!TC_VALIDATE_FIX_SUB (fixP, add_symbol_segment))
1019 {
1020 if (!md_register_arithmetic
1021 && (add_symbol_segment == reg_section
1022 || sub_symbol_segment == reg_section))
1023 as_bad_where (fixP->fx_file, fixP->fx_line,
1024 _("register value used as expression"));
1025 else
1026 as_bad_where (fixP->fx_file, fixP->fx_line,
1027 _("can't resolve `%s' {%s section} - `%s' {%s section}"),
1028 fixP->fx_addsy ? S_GET_NAME (fixP->fx_addsy) : "0",
1029 segment_name (add_symbol_segment),
1030 S_GET_NAME (fixP->fx_subsy),
1031 segment_name (sub_symbol_segment));
1032 }
1033 else if (sub_symbol_segment != undefined_section
1034 && ! bfd_is_com_section (sub_symbol_segment)
1035 && MD_APPLY_SYM_VALUE (fixP))
1036 add_number -= S_GET_VALUE (fixP->fx_subsy);
1037 }
1038
1039 if (fixP->fx_addsy)
1040 {
1041 if (add_symbol_segment == this_segment
1042 && !S_FORCE_RELOC (fixP->fx_addsy, 0)
1043 && !TC_FORCE_RELOCATION_LOCAL (fixP))
1044 {
1045 /* This fixup was made when the symbol's segment was
1046 SEG_UNKNOWN, but it is now in the local segment.
1047 So we know how to do the address without relocation. */
1048 add_number += S_GET_VALUE (fixP->fx_addsy);
1049 fixP->fx_offset = add_number;
1050 if (fixP->fx_pcrel)
1051 add_number -= MD_PCREL_FROM_SECTION (fixP, this_segment);
1052 fixP->fx_addsy = NULL;
1053 fixP->fx_pcrel = 0;
1054 }
1055 else if (add_symbol_segment == absolute_section
1056 && !S_FORCE_RELOC (fixP->fx_addsy, 0)
1057 && !TC_FORCE_RELOCATION_ABS (fixP))
1058 {
1059 add_number += S_GET_VALUE (fixP->fx_addsy);
1060 fixP->fx_offset = add_number;
1061 fixP->fx_addsy = NULL;
1062 }
1063 else if (add_symbol_segment != undefined_section
1064 && ! bfd_is_com_section (add_symbol_segment)
1065 && MD_APPLY_SYM_VALUE (fixP))
1066 add_number += S_GET_VALUE (fixP->fx_addsy);
1067 }
1068
1069 if (fixP->fx_pcrel)
1070 {
1071 add_number -= MD_PCREL_FROM_SECTION (fixP, this_segment);
1072 if (!fixP->fx_done && fixP->fx_addsy == NULL)
1073 {
1074 /* There was no symbol required by this relocation.
1075 However, BFD doesn't really handle relocations
1076 without symbols well. So fake up a local symbol in
1077 the absolute section. */
1078 fixP->fx_addsy = abs_section_sym;
1079 }
1080 }
1081
1082 if (!fixP->fx_done)
1083 md_apply_fix (fixP, &add_number, this_segment);
1084
1085 if (!fixP->fx_done)
1086 {
1087 if (fixP->fx_addsy == NULL)
1088 fixP->fx_addsy = abs_section_sym;
1089 symbol_mark_used_in_reloc (fixP->fx_addsy);
1090 if (fixP->fx_subsy != NULL)
1091 symbol_mark_used_in_reloc (fixP->fx_subsy);
1092 }
1093
1094 if (!fixP->fx_no_overflow && fixP->fx_size != 0)
1095 {
1096 if (fixP->fx_size < sizeof (valueT))
1097 {
1098 valueT mask;
1099
1100 mask = 0;
1101 mask--; /* Set all bits to one. */
1102 mask <<= fixP->fx_size * 8 - (fixP->fx_signed ? 1 : 0);
1103 if ((add_number & mask) != 0 && (add_number & mask) != mask)
1104 {
1105 char buf[50], buf2[50];
1106 sprint_value (buf, fragP->fr_address + fixP->fx_where);
1107 if (add_number > 1000)
1108 sprint_value (buf2, add_number);
1109 else
1110 sprintf (buf2, "%ld", (long) add_number);
1111 as_bad_where (fixP->fx_file, fixP->fx_line,
1112 ngettext ("value of %s too large for field "
1113 "of %d byte at %s",
1114 "value of %s too large for field "
1115 "of %d bytes at %s",
1116 fixP->fx_size),
1117 buf2, fixP->fx_size, buf);
1118 } /* Generic error checking. */
1119 }
1120 #ifdef WARN_SIGNED_OVERFLOW_WORD
1121 /* Warn if a .word value is too large when treated as a signed
1122 number. We already know it is not too negative. This is to
1123 catch over-large switches generated by gcc on the 68k. */
1124 if (!flag_signed_overflow_ok
1125 && fixP->fx_size == 2
1126 && add_number > 0x7fff)
1127 as_bad_where (fixP->fx_file, fixP->fx_line,
1128 _("signed .word overflow; switch may be too large; %ld at 0x%lx"),
1129 (long) add_number,
1130 (long) (fragP->fr_address + fixP->fx_where));
1131 #endif
1132 }
1133
1134 #ifdef TC_VALIDATE_FIX
1135 skip: ATTRIBUTE_UNUSED_LABEL
1136 ;
1137 #endif
1138 #ifdef DEBUG5
1139 fprintf (stderr, "result:\n");
1140 print_fixup (fixP);
1141 #endif
1142 } /* For each fixS in this segment. */
1143 }
1144
1145 static void
1146 fix_segment (bfd *abfd ATTRIBUTE_UNUSED,
1147 asection *sec,
1148 void *xxx ATTRIBUTE_UNUSED)
1149 {
1150 segment_info_type *seginfo = seg_info (sec);
1151
1152 fixup_segment (seginfo->fix_root, sec);
1153 }
1154
1155 static void
1156 install_reloc (asection *sec, arelent *reloc, fragS *fragp,
1157 const char *file, unsigned int line)
1158 {
1159 char *err;
1160 bfd_reloc_status_type s;
1161 asymbol *sym;
1162
1163 if (reloc->sym_ptr_ptr != NULL
1164 && (sym = *reloc->sym_ptr_ptr) != NULL
1165 && (sym->flags & BSF_KEEP) == 0
1166 && ((sym->flags & BSF_SECTION_SYM) == 0
1167 || (EMIT_SECTION_SYMBOLS
1168 && !bfd_is_abs_section (sym->section))))
1169 as_bad_where (file, line, _("redefined symbol cannot be used on reloc"));
1170
1171 s = bfd_install_relocation (stdoutput, reloc,
1172 fragp->fr_literal, fragp->fr_address,
1173 sec, &err);
1174 switch (s)
1175 {
1176 case bfd_reloc_ok:
1177 break;
1178 case bfd_reloc_overflow:
1179 as_bad_where (file, line, _("relocation overflow"));
1180 break;
1181 case bfd_reloc_outofrange:
1182 as_bad_where (file, line, _("relocation out of range"));
1183 break;
1184 default:
1185 as_fatal (_("%s:%u: bad return from bfd_install_relocation: %x"),
1186 file, line, s);
1187 }
1188 }
1189
1190 static fragS *
1191 get_frag_for_reloc (fragS *last_frag,
1192 const segment_info_type *seginfo,
1193 const struct reloc_list *r)
1194 {
1195 fragS *f;
1196
1197 for (f = last_frag; f != NULL; f = f->fr_next)
1198 if (f->fr_address <= r->u.b.r.address
1199 && r->u.b.r.address < f->fr_address + f->fr_fix)
1200 return f;
1201
1202 for (f = seginfo->frchainP->frch_root; f != NULL; f = f->fr_next)
1203 if (f->fr_address <= r->u.b.r.address
1204 && r->u.b.r.address < f->fr_address + f->fr_fix)
1205 return f;
1206
1207 for (f = seginfo->frchainP->frch_root; f != NULL; f = f->fr_next)
1208 if (f->fr_address <= r->u.b.r.address
1209 && r->u.b.r.address <= f->fr_address + f->fr_fix)
1210 return f;
1211
1212 as_bad_where (r->file, r->line,
1213 _("reloc not within (fixed part of) section"));
1214 return NULL;
1215 }
1216
1217 static void
1218 write_relocs (bfd *abfd, asection *sec, void *xxx ATTRIBUTE_UNUSED)
1219 {
1220 segment_info_type *seginfo = seg_info (sec);
1221 unsigned int n;
1222 struct reloc_list *my_reloc_list, **rp, *r;
1223 arelent **relocs;
1224 fixS *fixp;
1225 fragS *last_frag;
1226
1227 /* If seginfo is NULL, we did not create this section; don't do
1228 anything with it. */
1229 if (seginfo == NULL)
1230 return;
1231
1232 n = 0;
1233 for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next)
1234 if (!fixp->fx_done)
1235 n++;
1236
1237 #ifdef RELOC_EXPANSION_POSSIBLE
1238 n *= MAX_RELOC_EXPANSION;
1239 #endif
1240
1241 /* Extract relocs for this section from reloc_list. */
1242 rp = &reloc_list;
1243 my_reloc_list = NULL;
1244 while ((r = *rp) != NULL)
1245 {
1246 if (r->u.b.sec == sec)
1247 {
1248 *rp = r->next;
1249 r->next = my_reloc_list;
1250 my_reloc_list = r;
1251 n++;
1252 }
1253 else
1254 rp = &r->next;
1255 }
1256
1257 relocs = XCNEWVEC (arelent *, n);
1258
1259 n = 0;
1260 r = my_reloc_list;
1261 last_frag = NULL;
1262 for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next)
1263 {
1264 int fx_size, slack;
1265 valueT loc;
1266 arelent **reloc;
1267 #ifndef RELOC_EXPANSION_POSSIBLE
1268 arelent *rel;
1269
1270 reloc = &rel;
1271 #endif
1272
1273 if (fixp->fx_done)
1274 continue;
1275
1276 fx_size = fixp->fx_size;
1277 slack = TC_FX_SIZE_SLACK (fixp);
1278 if (slack > 0)
1279 fx_size = fx_size > slack ? fx_size - slack : 0;
1280 loc = fixp->fx_where + fx_size;
1281 if (slack >= 0 && loc > fixp->fx_frag->fr_fix)
1282 as_bad_where (fixp->fx_file, fixp->fx_line,
1283 _("internal error: fixup not contained within frag"));
1284
1285 #ifndef RELOC_EXPANSION_POSSIBLE
1286 *reloc = tc_gen_reloc (sec, fixp);
1287 #else
1288 reloc = tc_gen_reloc (sec, fixp);
1289 #endif
1290
1291 while (*reloc)
1292 {
1293 while (r != NULL && r->u.b.r.address < (*reloc)->address)
1294 {
1295 fragS *f = get_frag_for_reloc (last_frag, seginfo, r);
1296 if (f != NULL)
1297 {
1298 last_frag = f;
1299 relocs[n++] = &r->u.b.r;
1300 install_reloc (sec, &r->u.b.r, f, r->file, r->line);
1301 }
1302 r = r->next;
1303 }
1304 relocs[n++] = *reloc;
1305 install_reloc (sec, *reloc, fixp->fx_frag,
1306 fixp->fx_file, fixp->fx_line);
1307 #ifndef RELOC_EXPANSION_POSSIBLE
1308 break;
1309 #else
1310 reloc++;
1311 #endif
1312 }
1313 }
1314
1315 while (r != NULL)
1316 {
1317 fragS *f = get_frag_for_reloc (last_frag, seginfo, r);
1318 if (f != NULL)
1319 {
1320 last_frag = f;
1321 relocs[n++] = &r->u.b.r;
1322 install_reloc (sec, &r->u.b.r, f, r->file, r->line);
1323 }
1324 r = r->next;
1325 }
1326
1327 #ifdef DEBUG4
1328 {
1329 unsigned int k, j, nsyms;
1330 asymbol **sympp;
1331 sympp = bfd_get_outsymbols (stdoutput);
1332 nsyms = bfd_get_symcount (stdoutput);
1333 for (k = 0; k < n; k++)
1334 if (((*relocs[k]->sym_ptr_ptr)->flags & BSF_SECTION_SYM) == 0)
1335 {
1336 for (j = 0; j < nsyms; j++)
1337 if (sympp[j] == *relocs[k]->sym_ptr_ptr)
1338 break;
1339 if (j == nsyms)
1340 abort ();
1341 }
1342 }
1343 #endif
1344
1345 if (n)
1346 {
1347 flagword flags = bfd_get_section_flags (abfd, sec);
1348 flags |= SEC_RELOC;
1349 bfd_set_section_flags (abfd, sec, flags);
1350 bfd_set_reloc (stdoutput, sec, relocs, n);
1351 }
1352
1353 #ifdef SET_SECTION_RELOCS
1354 SET_SECTION_RELOCS (sec, relocs, n);
1355 #endif
1356
1357 #ifdef DEBUG3
1358 {
1359 unsigned int k;
1360
1361 fprintf (stderr, "relocs for sec %s\n", sec->name);
1362 for (k = 0; k < n; k++)
1363 {
1364 arelent *rel = relocs[k];
1365 asymbol *s = *rel->sym_ptr_ptr;
1366 fprintf (stderr, " reloc %2d @%p off %4lx : sym %-10s addend %lx\n",
1367 k, rel, (unsigned long)rel->address, s->name,
1368 (unsigned long)rel->addend);
1369 }
1370 }
1371 #endif
1372 }
1373
1374 static int
1375 compress_frag (struct z_stream_s *strm, const char *contents, int in_size,
1376 fragS **last_newf, struct obstack *ob)
1377 {
1378 int out_size;
1379 int total_out_size = 0;
1380 fragS *f = *last_newf;
1381 char *next_out;
1382 int avail_out;
1383
1384 /* Call the compression routine repeatedly until it has finished
1385 processing the frag. */
1386 while (in_size > 0)
1387 {
1388 /* Reserve all the space available in the current chunk.
1389 If none is available, start a new frag. */
1390 avail_out = obstack_room (ob);
1391 if (avail_out <= 0)
1392 {
1393 obstack_finish (ob);
1394 f = frag_alloc (ob);
1395 f->fr_type = rs_fill;
1396 (*last_newf)->fr_next = f;
1397 *last_newf = f;
1398 avail_out = obstack_room (ob);
1399 }
1400 if (avail_out <= 0)
1401 as_fatal (_("can't extend frag"));
1402 next_out = obstack_next_free (ob);
1403 obstack_blank_fast (ob, avail_out);
1404 out_size = compress_data (strm, &contents, &in_size,
1405 &next_out, &avail_out);
1406 if (out_size < 0)
1407 return -1;
1408
1409 f->fr_fix += out_size;
1410 total_out_size += out_size;
1411
1412 /* Return unused space. */
1413 if (avail_out > 0)
1414 obstack_blank_fast (ob, -avail_out);
1415 }
1416
1417 return total_out_size;
1418 }
1419
1420 static void
1421 compress_debug (bfd *abfd, asection *sec, void *xxx ATTRIBUTE_UNUSED)
1422 {
1423 segment_info_type *seginfo = seg_info (sec);
1424 fragS *f;
1425 fragS *first_newf;
1426 fragS *last_newf;
1427 struct obstack *ob = &seginfo->frchainP->frch_obstack;
1428 bfd_size_type uncompressed_size = (bfd_size_type) sec->size;
1429 bfd_size_type compressed_size;
1430 const char *section_name;
1431 char *compressed_name;
1432 char *header;
1433 struct z_stream_s *strm;
1434 int x;
1435 flagword flags = bfd_get_section_flags (abfd, sec);
1436 unsigned int header_size, compression_header_size;
1437
1438 if (seginfo == NULL
1439 || sec->size < 32
1440 || (flags & (SEC_ALLOC | SEC_HAS_CONTENTS)) == SEC_ALLOC)
1441 return;
1442
1443 section_name = bfd_get_section_name (stdoutput, sec);
1444 if (strncmp (section_name, ".debug_", 7) != 0)
1445 return;
1446
1447 strm = compress_init ();
1448 if (strm == NULL)
1449 return;
1450
1451 if (flag_compress_debug == COMPRESS_DEBUG_GABI_ZLIB)
1452 {
1453 compression_header_size
1454 = bfd_get_compression_header_size (stdoutput, NULL);
1455 header_size = compression_header_size;
1456 }
1457 else
1458 {
1459 compression_header_size = 0;
1460 header_size = 12;
1461 }
1462
1463 /* Create a new frag to contain the compression header. */
1464 first_newf = frag_alloc (ob);
1465 if (obstack_room (ob) < header_size)
1466 first_newf = frag_alloc (ob);
1467 if (obstack_room (ob) < header_size)
1468 as_fatal (ngettext ("can't extend frag %lu char",
1469 "can't extend frag %lu chars",
1470 (unsigned long) header_size),
1471 (unsigned long) header_size);
1472 last_newf = first_newf;
1473 obstack_blank_fast (ob, header_size);
1474 last_newf->fr_type = rs_fill;
1475 last_newf->fr_fix = header_size;
1476 header = last_newf->fr_literal;
1477 compressed_size = header_size;
1478
1479 /* Stream the frags through the compression engine, adding new frags
1480 as necessary to accommodate the compressed output. */
1481 for (f = seginfo->frchainP->frch_root;
1482 f;
1483 f = f->fr_next)
1484 {
1485 offsetT fill_size;
1486 char *fill_literal;
1487 offsetT count;
1488 int out_size;
1489
1490 gas_assert (f->fr_type == rs_fill);
1491 if (f->fr_fix)
1492 {
1493 out_size = compress_frag (strm, f->fr_literal, f->fr_fix,
1494 &last_newf, ob);
1495 if (out_size < 0)
1496 return;
1497 compressed_size += out_size;
1498 }
1499 fill_literal = f->fr_literal + f->fr_fix;
1500 fill_size = f->fr_var;
1501 count = f->fr_offset;
1502 gas_assert (count >= 0);
1503 if (fill_size && count)
1504 {
1505 while (count--)
1506 {
1507 out_size = compress_frag (strm, fill_literal, (int) fill_size,
1508 &last_newf, ob);
1509 if (out_size < 0)
1510 return;
1511 compressed_size += out_size;
1512 }
1513 }
1514 }
1515
1516 /* Flush the compression state. */
1517 for (;;)
1518 {
1519 int avail_out;
1520 char *next_out;
1521 int out_size;
1522
1523 /* Reserve all the space available in the current chunk.
1524 If none is available, start a new frag. */
1525 avail_out = obstack_room (ob);
1526 if (avail_out <= 0)
1527 {
1528 fragS *newf;
1529
1530 obstack_finish (ob);
1531 newf = frag_alloc (ob);
1532 newf->fr_type = rs_fill;
1533 last_newf->fr_next = newf;
1534 last_newf = newf;
1535 avail_out = obstack_room (ob);
1536 }
1537 if (avail_out <= 0)
1538 as_fatal (_("can't extend frag"));
1539 next_out = obstack_next_free (ob);
1540 obstack_blank_fast (ob, avail_out);
1541 x = compress_finish (strm, &next_out, &avail_out, &out_size);
1542 if (x < 0)
1543 return;
1544
1545 last_newf->fr_fix += out_size;
1546 compressed_size += out_size;
1547
1548 /* Return unused space. */
1549 if (avail_out > 0)
1550 obstack_blank_fast (ob, -avail_out);
1551
1552 if (x == 0)
1553 break;
1554 }
1555
1556 /* PR binutils/18087: If compression didn't make the section smaller,
1557 just keep it uncompressed. */
1558 if (compressed_size >= uncompressed_size)
1559 return;
1560
1561 /* Replace the uncompressed frag list with the compressed frag list. */
1562 seginfo->frchainP->frch_root = first_newf;
1563 seginfo->frchainP->frch_last = last_newf;
1564
1565 /* Update the section size and its name. */
1566 bfd_update_compression_header (abfd, (bfd_byte *) header, sec);
1567 x = bfd_set_section_size (abfd, sec, compressed_size);
1568 gas_assert (x);
1569 if (!compression_header_size)
1570 {
1571 compressed_name = concat (".z", section_name + 1, (char *) NULL);
1572 bfd_section_name (stdoutput, sec) = compressed_name;
1573 }
1574 }
1575
1576 #ifndef md_generate_nops
1577 /* Genenerate COUNT bytes of no-op instructions to WHERE. A target
1578 backend must override this with proper no-op instructions. */
1579
1580 static void
1581 md_generate_nops (fragS *f ATTRIBUTE_UNUSED,
1582 char *where ATTRIBUTE_UNUSED,
1583 offsetT count ATTRIBUTE_UNUSED,
1584 int control ATTRIBUTE_UNUSED)
1585 {
1586 as_bad (_("unimplemented .nops directive"));
1587 }
1588 #endif
1589
1590 static void
1591 write_contents (bfd *abfd ATTRIBUTE_UNUSED,
1592 asection *sec,
1593 void *xxx ATTRIBUTE_UNUSED)
1594 {
1595 segment_info_type *seginfo = seg_info (sec);
1596 addressT offset = 0;
1597 fragS *f;
1598
1599 /* Write out the frags. */
1600 if (seginfo == NULL
1601 || !(bfd_get_section_flags (abfd, sec) & SEC_HAS_CONTENTS))
1602 return;
1603
1604 for (f = seginfo->frchainP->frch_root;
1605 f;
1606 f = f->fr_next)
1607 {
1608 int x;
1609 addressT fill_size;
1610 char *fill_literal;
1611 offsetT count;
1612
1613 gas_assert (f->fr_type == rs_fill || f->fr_type == rs_fill_nop);
1614 if (f->fr_fix)
1615 {
1616 x = bfd_set_section_contents (stdoutput, sec,
1617 f->fr_literal, (file_ptr) offset,
1618 (bfd_size_type) f->fr_fix);
1619 if (!x)
1620 as_fatal (ngettext ("can't write %ld byte "
1621 "to section %s of %s: '%s'",
1622 "can't write %ld bytes "
1623 "to section %s of %s: '%s'",
1624 (long) f->fr_fix),
1625 (long) f->fr_fix,
1626 sec->name, stdoutput->filename,
1627 bfd_errmsg (bfd_get_error ()));
1628 offset += f->fr_fix;
1629 }
1630
1631 fill_size = f->fr_var;
1632 count = f->fr_offset;
1633 fill_literal = f->fr_literal + f->fr_fix;
1634
1635 if (f->fr_type == rs_fill_nop)
1636 {
1637 gas_assert (count >= 0 && fill_size == 1);
1638 if (count > 0)
1639 {
1640 char *buf = xmalloc (count);
1641 md_generate_nops (f, buf, count, *fill_literal);
1642 x = bfd_set_section_contents
1643 (stdoutput, sec, buf, (file_ptr) offset,
1644 (bfd_size_type) count);
1645 if (!x)
1646 as_fatal (ngettext ("can't fill %ld byte "
1647 "in section %s of %s: '%s'",
1648 "can't fill %ld bytes "
1649 "in section %s of %s: '%s'",
1650 (long) count), (long) count,
1651 sec->name, stdoutput->filename,
1652 bfd_errmsg (bfd_get_error ()));
1653 offset += count;
1654 free (buf);
1655 }
1656 continue;
1657 }
1658
1659 gas_assert (count >= 0);
1660 if (fill_size && count)
1661 {
1662 char buf[256];
1663 if (fill_size > sizeof (buf))
1664 {
1665 /* Do it the old way. Can this ever happen? */
1666 while (count--)
1667 {
1668 x = bfd_set_section_contents (stdoutput, sec,
1669 fill_literal,
1670 (file_ptr) offset,
1671 (bfd_size_type) fill_size);
1672 if (!x)
1673 as_fatal (ngettext ("can't fill %ld byte "
1674 "in section %s of %s: '%s'",
1675 "can't fill %ld bytes "
1676 "in section %s of %s: '%s'",
1677 (long) fill_size),
1678 (long) fill_size,
1679 sec->name, stdoutput->filename,
1680 bfd_errmsg (bfd_get_error ()));
1681 offset += fill_size;
1682 }
1683 }
1684 else
1685 {
1686 /* Build a buffer full of fill objects and output it as
1687 often as necessary. This saves on the overhead of
1688 potentially lots of bfd_set_section_contents calls. */
1689 int n_per_buf, i;
1690 if (fill_size == 1)
1691 {
1692 n_per_buf = sizeof (buf);
1693 memset (buf, *fill_literal, n_per_buf);
1694 }
1695 else
1696 {
1697 char *bufp;
1698 n_per_buf = sizeof (buf) / fill_size;
1699 for (i = n_per_buf, bufp = buf; i; i--, bufp += fill_size)
1700 memcpy (bufp, fill_literal, fill_size);
1701 }
1702 for (; count > 0; count -= n_per_buf)
1703 {
1704 n_per_buf = n_per_buf > count ? count : n_per_buf;
1705 x = bfd_set_section_contents
1706 (stdoutput, sec, buf, (file_ptr) offset,
1707 (bfd_size_type) n_per_buf * fill_size);
1708 if (!x)
1709 as_fatal (ngettext ("can't fill %ld byte "
1710 "in section %s of %s: '%s'",
1711 "can't fill %ld bytes "
1712 "in section %s of %s: '%s'",
1713 (long) (n_per_buf * fill_size)),
1714 (long) (n_per_buf * fill_size),
1715 sec->name, stdoutput->filename,
1716 bfd_errmsg (bfd_get_error ()));
1717 offset += n_per_buf * fill_size;
1718 }
1719 }
1720 }
1721 }
1722 }
1723
1724 static void
1725 merge_data_into_text (void)
1726 {
1727 seg_info (text_section)->frchainP->frch_last->fr_next =
1728 seg_info (data_section)->frchainP->frch_root;
1729 seg_info (text_section)->frchainP->frch_last =
1730 seg_info (data_section)->frchainP->frch_last;
1731 seg_info (data_section)->frchainP = 0;
1732 }
1733
1734 static void
1735 set_symtab (void)
1736 {
1737 int nsyms;
1738 asymbol **asympp;
1739 symbolS *symp;
1740 bfd_boolean result;
1741
1742 /* Count symbols. We can't rely on a count made by the loop in
1743 write_object_file, because *_frob_file may add a new symbol or
1744 two. */
1745 nsyms = 0;
1746 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
1747 nsyms++;
1748
1749 if (nsyms)
1750 {
1751 int i;
1752 bfd_size_type amt = (bfd_size_type) nsyms * sizeof (asymbol *);
1753
1754 asympp = (asymbol **) bfd_alloc (stdoutput, amt);
1755 symp = symbol_rootP;
1756 for (i = 0; i < nsyms; i++, symp = symbol_next (symp))
1757 {
1758 asympp[i] = symbol_get_bfdsym (symp);
1759 if (asympp[i]->flags != BSF_SECTION_SYM
1760 || !(bfd_is_const_section (asympp[i]->section)
1761 && asympp[i]->section->symbol == asympp[i]))
1762 asympp[i]->flags |= BSF_KEEP;
1763 symbol_mark_written (symp);
1764 }
1765 }
1766 else
1767 asympp = 0;
1768 result = bfd_set_symtab (stdoutput, asympp, nsyms);
1769 gas_assert (result);
1770 symbol_table_frozen = 1;
1771 }
1772
1773 /* Finish the subsegments. After every sub-segment, we fake an
1774 ".align ...". This conforms to BSD4.2 brain-damage. We then fake
1775 ".fill 0" because that is the kind of frag that requires least
1776 thought. ".align" frags like to have a following frag since that
1777 makes calculating their intended length trivial. */
1778
1779 #ifndef SUB_SEGMENT_ALIGN
1780 #ifdef HANDLE_ALIGN
1781 /* The last subsegment gets an alignment corresponding to the alignment
1782 of the section. This allows proper nop-filling at the end of
1783 code-bearing sections. */
1784 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) \
1785 (!(FRCHAIN)->frch_next && subseg_text_p (SEG) \
1786 && !do_not_pad_sections_to_alignment \
1787 ? get_recorded_alignment (SEG) \
1788 : 0)
1789 #else
1790 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) 0
1791 #endif
1792 #endif
1793
1794 static void
1795 subsegs_finish_section (asection *s)
1796 {
1797 struct frchain *frchainP;
1798 segment_info_type *seginfo = seg_info (s);
1799 if (!seginfo)
1800 return;
1801
1802 for (frchainP = seginfo->frchainP;
1803 frchainP != NULL;
1804 frchainP = frchainP->frch_next)
1805 {
1806 int alignment;
1807
1808 subseg_set (s, frchainP->frch_subseg);
1809
1810 /* This now gets called even if we had errors. In that case,
1811 any alignment is meaningless, and, moreover, will look weird
1812 if we are generating a listing. */
1813 if (had_errors ())
1814 do_not_pad_sections_to_alignment = 1;
1815
1816 alignment = SUB_SEGMENT_ALIGN (now_seg, frchainP);
1817 if ((bfd_get_section_flags (now_seg->owner, now_seg) & SEC_MERGE)
1818 && now_seg->entsize)
1819 {
1820 unsigned int entsize = now_seg->entsize;
1821 int entalign = 0;
1822
1823 while ((entsize & 1) == 0)
1824 {
1825 ++entalign;
1826 entsize >>= 1;
1827 }
1828
1829 if (entalign > alignment)
1830 alignment = entalign;
1831 }
1832
1833 if (subseg_text_p (now_seg))
1834 frag_align_code (alignment, 0);
1835 else
1836 frag_align (alignment, 0, 0);
1837
1838 /* frag_align will have left a new frag.
1839 Use this last frag for an empty ".fill".
1840
1841 For this segment ...
1842 Create a last frag. Do not leave a "being filled in frag". */
1843 frag_wane (frag_now);
1844 frag_now->fr_fix = 0;
1845 know (frag_now->fr_next == NULL);
1846 }
1847 }
1848
1849 static void
1850 subsegs_finish (void)
1851 {
1852 asection *s;
1853
1854 for (s = stdoutput->sections; s; s = s->next)
1855 subsegs_finish_section (s);
1856 }
1857
1858 #ifdef OBJ_ELF
1859 static void
1860 create_obj_attrs_section (void)
1861 {
1862 segT s;
1863 char *p;
1864 offsetT size;
1865 const char *name;
1866
1867 size = bfd_elf_obj_attr_size (stdoutput);
1868 if (size == 0)
1869 return;
1870
1871 name = get_elf_backend_data (stdoutput)->obj_attrs_section;
1872 if (!name)
1873 name = ".gnu.attributes";
1874 s = subseg_new (name, 0);
1875 elf_section_type (s)
1876 = get_elf_backend_data (stdoutput)->obj_attrs_section_type;
1877 bfd_set_section_flags (stdoutput, s, SEC_READONLY | SEC_DATA);
1878 frag_now_fix ();
1879 p = frag_more (size);
1880 bfd_elf_set_obj_attr_contents (stdoutput, (bfd_byte *)p, size);
1881
1882 subsegs_finish_section (s);
1883 relax_segment (seg_info (s)->frchainP->frch_root, s, 0);
1884 size_seg (stdoutput, s, NULL);
1885 }
1886
1887 /* Create a relocation against an entry in a GNU Build attribute section. */
1888
1889 static void
1890 create_note_reloc (segT sec,
1891 symbolS * sym,
1892 bfd_size_type offset,
1893 int reloc_type,
1894 bfd_vma addend,
1895 char * note)
1896 {
1897 struct reloc_list * reloc;
1898
1899 reloc = XNEW (struct reloc_list);
1900
1901 /* We create a .b type reloc as resolve_reloc_expr_symbols() has already been called. */
1902 reloc->u.b.sec = sec;
1903 reloc->u.b.s = symbol_get_bfdsym (sym);
1904 reloc->u.b.r.sym_ptr_ptr = & reloc->u.b.s;
1905 reloc->u.b.r.address = offset;
1906 reloc->u.b.r.addend = addend;
1907 reloc->u.b.r.howto = bfd_reloc_type_lookup (stdoutput, reloc_type);
1908
1909 if (reloc->u.b.r.howto == NULL)
1910 {
1911 as_bad (_("unable to create reloc for build note"));
1912 return;
1913 }
1914
1915 reloc->file = N_("<gnu build note>");
1916 reloc->line = 0;
1917
1918 reloc->next = reloc_list;
1919 reloc_list = reloc;
1920
1921 /* For REL relocs, store the addend in the section. */
1922 if (! sec->use_rela_p
1923 /* The SH target is a special case that uses RELA relocs
1924 but still stores the addend in the word being relocated. */
1925 || strstr (bfd_get_target (stdoutput), "-sh") != NULL)
1926 {
1927 if (target_big_endian)
1928 {
1929 if (bfd_arch_bits_per_address (stdoutput) <= 32)
1930 note[offset + 3] = addend;
1931 else
1932 note[offset + 7] = addend;
1933 }
1934 else
1935 note[offset] = addend;
1936 }
1937 }
1938
1939 static void
1940 maybe_generate_build_notes (void)
1941 {
1942 segT sec;
1943 char * note;
1944 offsetT note_size;
1945 offsetT total_size;
1946 offsetT desc_size;
1947 offsetT desc2_offset;
1948 int desc_reloc;
1949 symbolS * sym;
1950 asymbol * bsym;
1951
1952 if (! flag_generate_build_notes
1953 || bfd_get_section_by_name (stdoutput,
1954 GNU_BUILD_ATTRS_SECTION_NAME) != NULL)
1955 return;
1956
1957 /* Create a GNU Build Attribute section. */
1958 sec = subseg_new (GNU_BUILD_ATTRS_SECTION_NAME, FALSE);
1959 elf_section_type (sec) = SHT_NOTE;
1960 bfd_set_section_flags (stdoutput, sec,
1961 SEC_READONLY | SEC_HAS_CONTENTS | SEC_DATA);
1962 bfd_set_section_alignment (stdoutput, sec, 2);
1963
1964 /* Work out the size of the notes that we will create,
1965 and the relocation we should use. */
1966 if (bfd_arch_bits_per_address (stdoutput) <= 32)
1967 {
1968 note_size = 28;
1969 desc_size = 8; /* Two 4-byte offsets. */
1970 desc2_offset = 24;
1971
1972 /* FIXME: The BFD backend for the CRX target does not support the
1973 BFD_RELOC_32, even though it really should. Likewise for the
1974 CR16 target. So we have special case code here... */
1975 if (strstr (bfd_get_target (stdoutput), "-crx") != NULL)
1976 desc_reloc = BFD_RELOC_CRX_NUM32;
1977 else if (strstr (bfd_get_target (stdoutput), "-cr16") != NULL)
1978 desc_reloc = BFD_RELOC_CR16_NUM32;
1979 else
1980 desc_reloc = BFD_RELOC_32;
1981 }
1982 else
1983 {
1984 note_size = 36;
1985 desc_size = 16; /* Two 8-byte offsets. */
1986 desc2_offset = 28;
1987 /* FIXME: The BFD backend for the IA64 target does not support the
1988 BFD_RELOC_64, even though it really should. The HPPA backend
1989 has a similar issue, although it does not support BFD_RELOCs at
1990 all! So we have special case code to handle these targets. */
1991 if (strstr (bfd_get_target (stdoutput), "-ia64") != NULL)
1992 desc_reloc = target_big_endian ? BFD_RELOC_IA64_DIR32MSB : BFD_RELOC_IA64_DIR32LSB;
1993 else if (strstr (bfd_get_target (stdoutput), "-hppa") != NULL)
1994 desc_reloc = 80; /* R_PARISC_DIR64. */
1995 else
1996 desc_reloc = BFD_RELOC_64;
1997 }
1998
1999 /* We have to create a note for *each* code section.
2000 Linker garbage collection might discard some. */
2001 total_size = 0;
2002 note = NULL;
2003
2004 for (sym = symbol_rootP; sym != NULL; sym = symbol_next (sym))
2005 if ((bsym = symbol_get_bfdsym (sym)) != NULL
2006 && bsym->flags & BSF_SECTION_SYM
2007 && bsym->section != NULL
2008 /* Skip linkonce sections - we cannot use these section symbols as they may disappear. */
2009 && (bsym->section->flags & (SEC_CODE | SEC_LINK_ONCE)) == SEC_CODE
2010 /* Not all linkonce sections are flagged... */
2011 && strncmp (S_GET_NAME (sym), ".gnu.linkonce", sizeof ".gnu.linkonce" - 1) != 0)
2012 {
2013 /* Create a version note. */
2014 frag_now_fix ();
2015 note = frag_more (note_size);
2016 memset (note, 0, note_size);
2017
2018 if (target_big_endian)
2019 {
2020 note[3] = 8; /* strlen (name) + 1. */
2021 note[7] = desc_size; /* Two 8-byte offsets. */
2022 note[10] = NT_GNU_BUILD_ATTRIBUTE_OPEN >> 8;
2023 note[11] = NT_GNU_BUILD_ATTRIBUTE_OPEN & 0xff;
2024 }
2025 else
2026 {
2027 note[0] = 8; /* strlen (name) + 1. */
2028 note[4] = desc_size; /* Two 8-byte offsets. */
2029 note[8] = NT_GNU_BUILD_ATTRIBUTE_OPEN & 0xff;
2030 note[9] = NT_GNU_BUILD_ATTRIBUTE_OPEN >> 8;
2031 }
2032
2033 /* The a1 version number indicates that this note was
2034 generated by the assembler and not the gcc annobin plugin. */
2035 memcpy (note + 12, "GA$\ 13a1", 8);
2036
2037 /* Create a relocation to install the start address of the note... */
2038 create_note_reloc (sec, sym, total_size + 20, desc_reloc, 0, note);
2039
2040 /* ...and another one to install the end address. */
2041 create_note_reloc (sec, sym, total_size + desc2_offset, desc_reloc,
2042 bfd_get_section_size (bsym->section),
2043 note);
2044
2045 total_size += note_size;
2046 /* FIXME: Maybe add a note recording the assembler command line and version ? */
2047 }
2048
2049 /* Install the note(s) into the section. */
2050 if (total_size)
2051 bfd_set_section_contents (stdoutput, sec, (bfd_byte *) note, 0, total_size);
2052 subsegs_finish_section (sec);
2053 relax_segment (seg_info (sec)->frchainP->frch_root, sec, 0);
2054 size_seg (stdoutput, sec, NULL);
2055 }
2056 #endif /* OBJ_ELF */
2057
2058 /* Write the object file. */
2059
2060 void
2061 write_object_file (void)
2062 {
2063 struct relax_seg_info rsi;
2064 #ifndef WORKING_DOT_WORD
2065 fragS *fragP; /* Track along all frags. */
2066 #endif
2067
2068 subsegs_finish ();
2069
2070 #ifdef md_pre_output_hook
2071 md_pre_output_hook;
2072 #endif
2073
2074 #ifdef md_pre_relax_hook
2075 md_pre_relax_hook;
2076 #endif
2077
2078 /* From now on, we don't care about sub-segments. Build one frag chain
2079 for each segment. Linked through fr_next. */
2080
2081 /* Remove the sections created by gas for its own purposes. */
2082 {
2083 int i;
2084
2085 bfd_section_list_remove (stdoutput, reg_section);
2086 bfd_section_list_remove (stdoutput, expr_section);
2087 stdoutput->section_count -= 2;
2088 i = 0;
2089 bfd_map_over_sections (stdoutput, renumber_sections, &i);
2090 }
2091
2092 bfd_map_over_sections (stdoutput, chain_frchains_together, (char *) 0);
2093
2094 /* We have two segments. If user gave -R flag, then we must put the
2095 data frags into the text segment. Do this before relaxing so
2096 we know to take advantage of -R and make shorter addresses. */
2097 if (flag_readonly_data_in_text)
2098 {
2099 merge_data_into_text ();
2100 }
2101
2102 rsi.pass = 0;
2103 while (1)
2104 {
2105 #ifndef WORKING_DOT_WORD
2106 /* We need to reset the markers in the broken word list and
2107 associated frags between calls to relax_segment (via
2108 relax_seg). Since the broken word list is global, we do it
2109 once per round, rather than locally in relax_segment for each
2110 segment. */
2111 struct broken_word *brokp;
2112
2113 for (brokp = broken_words;
2114 brokp != (struct broken_word *) NULL;
2115 brokp = brokp->next_broken_word)
2116 {
2117 brokp->added = 0;
2118
2119 if (brokp->dispfrag != (fragS *) NULL
2120 && brokp->dispfrag->fr_type == rs_broken_word)
2121 brokp->dispfrag->fr_subtype = 0;
2122 }
2123 #endif
2124
2125 rsi.changed = 0;
2126 bfd_map_over_sections (stdoutput, relax_seg, &rsi);
2127 rsi.pass++;
2128 if (!rsi.changed)
2129 break;
2130 }
2131
2132 /* Note - Most ports will use the default value of
2133 TC_FINALIZE_SYMS_BEFORE_SIZE_SEG, which 1. This will force
2134 local symbols to be resolved, removing their frag information.
2135 Some ports however, will not have finished relaxing all of
2136 their frags and will still need the local symbol frag
2137 information. These ports can set
2138 TC_FINALIZE_SYMS_BEFORE_SIZE_SEG to 0. */
2139 finalize_syms = TC_FINALIZE_SYMS_BEFORE_SIZE_SEG;
2140
2141 bfd_map_over_sections (stdoutput, size_seg, (char *) 0);
2142
2143 /* Relaxation has completed. Freeze all syms. */
2144 finalize_syms = 1;
2145
2146 dwarf2dbg_final_check ();
2147
2148 #ifdef md_post_relax_hook
2149 md_post_relax_hook;
2150 #endif
2151
2152 #ifdef OBJ_ELF
2153 if (IS_ELF)
2154 create_obj_attrs_section ();
2155 #endif
2156
2157 #ifndef WORKING_DOT_WORD
2158 {
2159 struct broken_word *lie;
2160 struct broken_word **prevP;
2161
2162 prevP = &broken_words;
2163 for (lie = broken_words; lie; lie = lie->next_broken_word)
2164 if (!lie->added)
2165 {
2166 expressionS exp;
2167
2168 subseg_change (lie->seg, lie->subseg);
2169 exp.X_op = O_subtract;
2170 exp.X_add_symbol = lie->add;
2171 exp.X_op_symbol = lie->sub;
2172 exp.X_add_number = lie->addnum;
2173 #ifdef TC_CONS_FIX_NEW
2174 TC_CONS_FIX_NEW (lie->frag,
2175 lie->word_goes_here - lie->frag->fr_literal,
2176 2, &exp, TC_PARSE_CONS_RETURN_NONE);
2177 #else
2178 fix_new_exp (lie->frag,
2179 lie->word_goes_here - lie->frag->fr_literal,
2180 2, &exp, 0, BFD_RELOC_16);
2181 #endif
2182 *prevP = lie->next_broken_word;
2183 }
2184 else
2185 prevP = &(lie->next_broken_word);
2186
2187 for (lie = broken_words; lie;)
2188 {
2189 struct broken_word *untruth;
2190 char *table_ptr;
2191 addressT table_addr;
2192 addressT from_addr, to_addr;
2193 int n, m;
2194
2195 subseg_change (lie->seg, lie->subseg);
2196 fragP = lie->dispfrag;
2197
2198 /* Find out how many broken_words go here. */
2199 n = 0;
2200 for (untruth = lie;
2201 untruth && untruth->dispfrag == fragP;
2202 untruth = untruth->next_broken_word)
2203 if (untruth->added == 1)
2204 n++;
2205
2206 table_ptr = lie->dispfrag->fr_opcode;
2207 table_addr = (lie->dispfrag->fr_address
2208 + (table_ptr - lie->dispfrag->fr_literal));
2209 /* Create the jump around the long jumps. This is a short
2210 jump from table_ptr+0 to table_ptr+n*long_jump_size. */
2211 from_addr = table_addr;
2212 to_addr = table_addr + md_short_jump_size + n * md_long_jump_size;
2213 md_create_short_jump (table_ptr, from_addr, to_addr, lie->dispfrag,
2214 lie->add);
2215 table_ptr += md_short_jump_size;
2216 table_addr += md_short_jump_size;
2217
2218 for (m = 0;
2219 lie && lie->dispfrag == fragP;
2220 m++, lie = lie->next_broken_word)
2221 {
2222 if (lie->added == 2)
2223 continue;
2224 /* Patch the jump table. */
2225 for (untruth = (struct broken_word *) (fragP->fr_symbol);
2226 untruth && untruth->dispfrag == fragP;
2227 untruth = untruth->next_broken_word)
2228 {
2229 if (untruth->use_jump == lie)
2230 {
2231 /* This is the offset from ??? to table_ptr+0.
2232 The target is the same for all users of this
2233 md_long_jump, but the "sub" bases (and hence the
2234 offsets) may be different. */
2235 addressT to_word = table_addr - S_GET_VALUE (untruth->sub);
2236 #ifdef TC_CHECK_ADJUSTED_BROKEN_DOT_WORD
2237 TC_CHECK_ADJUSTED_BROKEN_DOT_WORD (to_word, untruth);
2238 #endif
2239 md_number_to_chars (untruth->word_goes_here, to_word, 2);
2240 }
2241 }
2242
2243 /* Install the long jump. */
2244 /* This is a long jump from table_ptr+0 to the final target. */
2245 from_addr = table_addr;
2246 to_addr = S_GET_VALUE (lie->add) + lie->addnum;
2247 md_create_long_jump (table_ptr, from_addr, to_addr, lie->dispfrag,
2248 lie->add);
2249 table_ptr += md_long_jump_size;
2250 table_addr += md_long_jump_size;
2251 }
2252 }
2253 }
2254 #endif /* not WORKING_DOT_WORD */
2255
2256 /* Resolve symbol values. This needs to be done before processing
2257 the relocations. */
2258 if (symbol_rootP)
2259 {
2260 symbolS *symp;
2261
2262 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
2263 resolve_symbol_value (symp);
2264 }
2265 resolve_local_symbol_values ();
2266 resolve_reloc_expr_symbols ();
2267
2268 #ifdef OBJ_ELF
2269 if (IS_ELF)
2270 maybe_generate_build_notes ();
2271 #endif
2272
2273 PROGRESS (1);
2274
2275 #ifdef tc_frob_file_before_adjust
2276 tc_frob_file_before_adjust ();
2277 #endif
2278 #ifdef obj_frob_file_before_adjust
2279 obj_frob_file_before_adjust ();
2280 #endif
2281
2282 bfd_map_over_sections (stdoutput, adjust_reloc_syms, (char *) 0);
2283
2284 #ifdef tc_frob_file_before_fix
2285 tc_frob_file_before_fix ();
2286 #endif
2287 #ifdef obj_frob_file_before_fix
2288 obj_frob_file_before_fix ();
2289 #endif
2290
2291 bfd_map_over_sections (stdoutput, fix_segment, (char *) 0);
2292
2293 /* Set up symbol table, and write it out. */
2294 if (symbol_rootP)
2295 {
2296 symbolS *symp;
2297 bfd_boolean skip_next_symbol = FALSE;
2298
2299 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
2300 {
2301 int punt = 0;
2302 const char *name;
2303
2304 if (skip_next_symbol)
2305 {
2306 /* Don't do anything besides moving the value of the
2307 symbol from the GAS value-field to the BFD value-field. */
2308 symbol_get_bfdsym (symp)->value = S_GET_VALUE (symp);
2309 skip_next_symbol = FALSE;
2310 continue;
2311 }
2312
2313 if (symbol_mri_common_p (symp))
2314 {
2315 if (S_IS_EXTERNAL (symp))
2316 as_bad (_("%s: global symbols not supported in common sections"),
2317 S_GET_NAME (symp));
2318 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
2319 continue;
2320 }
2321
2322 name = S_GET_NAME (symp);
2323 if (name)
2324 {
2325 const char *name2 =
2326 decode_local_label_name ((char *) S_GET_NAME (symp));
2327 /* They only differ if `name' is a fb or dollar local
2328 label name. */
2329 if (name2 != name && ! S_IS_DEFINED (symp))
2330 as_bad (_("local label `%s' is not defined"), name2);
2331 }
2332
2333 /* Do it again, because adjust_reloc_syms might introduce
2334 more symbols. They'll probably only be section symbols,
2335 but they'll still need to have the values computed. */
2336 resolve_symbol_value (symp);
2337
2338 /* Skip symbols which were equated to undefined or common
2339 symbols. */
2340 if (symbol_equated_reloc_p (symp)
2341 || S_IS_WEAKREFR (symp))
2342 {
2343 const char *sname = S_GET_NAME (symp);
2344
2345 if (S_IS_COMMON (symp)
2346 && !TC_FAKE_LABEL (sname)
2347 && !S_IS_WEAKREFR (symp))
2348 {
2349 expressionS *e = symbol_get_value_expression (symp);
2350
2351 as_bad (_("`%s' can't be equated to common symbol `%s'"),
2352 sname, S_GET_NAME (e->X_add_symbol));
2353 }
2354 if (S_GET_SEGMENT (symp) == reg_section)
2355 {
2356 /* Report error only if we know the symbol name. */
2357 if (S_GET_NAME (symp) != reg_section->name)
2358 as_bad (_("can't make global register symbol `%s'"),
2359 sname);
2360 }
2361 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
2362 continue;
2363 }
2364
2365 #ifdef obj_frob_symbol
2366 obj_frob_symbol (symp, punt);
2367 #endif
2368 #ifdef tc_frob_symbol
2369 if (! punt || symbol_used_in_reloc_p (symp))
2370 tc_frob_symbol (symp, punt);
2371 #endif
2372
2373 /* If we don't want to keep this symbol, splice it out of
2374 the chain now. If EMIT_SECTION_SYMBOLS is 0, we never
2375 want section symbols. Otherwise, we skip local symbols
2376 and symbols that the frob_symbol macros told us to punt,
2377 but we keep such symbols if they are used in relocs. */
2378 if (symp == abs_section_sym
2379 || (! EMIT_SECTION_SYMBOLS
2380 && symbol_section_p (symp))
2381 /* Note that S_IS_EXTERNAL and S_IS_LOCAL are not always
2382 opposites. Sometimes the former checks flags and the
2383 latter examines the name... */
2384 || (!S_IS_EXTERNAL (symp)
2385 && (punt || S_IS_LOCAL (symp) ||
2386 (S_IS_WEAKREFD (symp) && ! symbol_used_p (symp)))
2387 && ! symbol_used_in_reloc_p (symp)))
2388 {
2389 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
2390
2391 /* After symbol_remove, symbol_next(symp) still returns
2392 the one that came after it in the chain. So we don't
2393 need to do any extra cleanup work here. */
2394 continue;
2395 }
2396
2397 /* Make sure we really got a value for the symbol. */
2398 if (! symbol_resolved_p (symp))
2399 {
2400 as_bad (_("can't resolve value for symbol `%s'"),
2401 S_GET_NAME (symp));
2402 symbol_mark_resolved (symp);
2403 }
2404
2405 /* Set the value into the BFD symbol. Up til now the value
2406 has only been kept in the gas symbolS struct. */
2407 symbol_get_bfdsym (symp)->value = S_GET_VALUE (symp);
2408
2409 /* A warning construct is a warning symbol followed by the
2410 symbol warned about. Don't let anything object-format or
2411 target-specific muck with it; it's ready for output. */
2412 if (symbol_get_bfdsym (symp)->flags & BSF_WARNING)
2413 skip_next_symbol = TRUE;
2414 }
2415 }
2416
2417 PROGRESS (1);
2418
2419 /* Now do any format-specific adjustments to the symbol table, such
2420 as adding file symbols. */
2421 #ifdef tc_adjust_symtab
2422 tc_adjust_symtab ();
2423 #endif
2424 #ifdef obj_adjust_symtab
2425 obj_adjust_symtab ();
2426 #endif
2427
2428 /* Stop if there is an error. */
2429 if (had_errors ())
2430 return;
2431
2432 /* Now that all the sizes are known, and contents correct, we can
2433 start writing to the file. */
2434 set_symtab ();
2435
2436 /* If *_frob_file changes the symbol value at this point, it is
2437 responsible for moving the changed value into symp->bsym->value
2438 as well. Hopefully all symbol value changing can be done in
2439 *_frob_symbol. */
2440 #ifdef tc_frob_file
2441 tc_frob_file ();
2442 #endif
2443 #ifdef obj_frob_file
2444 obj_frob_file ();
2445 #endif
2446 #ifdef obj_coff_generate_pdata
2447 obj_coff_generate_pdata ();
2448 #endif
2449
2450 bfd_map_over_sections (stdoutput, write_relocs, (char *) 0);
2451
2452 #ifdef tc_frob_file_after_relocs
2453 tc_frob_file_after_relocs ();
2454 #endif
2455 #ifdef obj_frob_file_after_relocs
2456 obj_frob_file_after_relocs ();
2457 #endif
2458
2459 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
2460 if (IS_ELF && flag_use_elf_stt_common)
2461 stdoutput->flags |= BFD_CONVERT_ELF_COMMON | BFD_USE_ELF_STT_COMMON;
2462 #endif
2463
2464 /* Once all relocations have been written, we can compress the
2465 contents of the debug sections. This needs to be done before
2466 we start writing any sections, because it will affect the file
2467 layout, which is fixed once we start writing contents. */
2468 if (flag_compress_debug)
2469 {
2470 if (flag_compress_debug == COMPRESS_DEBUG_GABI_ZLIB)
2471 stdoutput->flags |= BFD_COMPRESS | BFD_COMPRESS_GABI;
2472 else
2473 stdoutput->flags |= BFD_COMPRESS;
2474 bfd_map_over_sections (stdoutput, compress_debug, (char *) 0);
2475 }
2476
2477 bfd_map_over_sections (stdoutput, write_contents, (char *) 0);
2478 }
2479
2480 #ifdef TC_GENERIC_RELAX_TABLE
2481 /* Relax a fragment by scanning TC_GENERIC_RELAX_TABLE. */
2482
2483 long
2484 relax_frag (segT segment, fragS *fragP, long stretch)
2485 {
2486 const relax_typeS *this_type;
2487 const relax_typeS *start_type;
2488 relax_substateT next_state;
2489 relax_substateT this_state;
2490 offsetT growth;
2491 offsetT aim;
2492 addressT target;
2493 addressT address;
2494 symbolS *symbolP;
2495 const relax_typeS *table;
2496
2497 target = fragP->fr_offset;
2498 address = fragP->fr_address;
2499 table = TC_GENERIC_RELAX_TABLE;
2500 this_state = fragP->fr_subtype;
2501 start_type = this_type = table + this_state;
2502 symbolP = fragP->fr_symbol;
2503
2504 if (symbolP)
2505 {
2506 fragS *sym_frag;
2507
2508 sym_frag = symbol_get_frag (symbolP);
2509
2510 #ifndef DIFF_EXPR_OK
2511 know (sym_frag != NULL);
2512 #endif
2513 know (S_GET_SEGMENT (symbolP) != absolute_section
2514 || sym_frag == &zero_address_frag);
2515 target += S_GET_VALUE (symbolP);
2516
2517 /* If SYM_FRAG has yet to be reached on this pass, assume it
2518 will move by STRETCH just as we did, unless there is an
2519 alignment frag between here and SYM_FRAG. An alignment may
2520 well absorb any STRETCH, and we don't want to choose a larger
2521 branch insn by overestimating the needed reach of this
2522 branch. It isn't critical to calculate TARGET exactly; We
2523 know we'll be doing another pass if STRETCH is non-zero. */
2524
2525 if (stretch != 0
2526 && sym_frag->relax_marker != fragP->relax_marker
2527 && S_GET_SEGMENT (symbolP) == segment)
2528 {
2529 if (stretch < 0
2530 || sym_frag->region == fragP->region)
2531 target += stretch;
2532 /* If we get here we know we have a forward branch. This
2533 relax pass may have stretched previous instructions so
2534 far that omitting STRETCH would make the branch
2535 negative. Don't allow this in case the negative reach is
2536 large enough to require a larger branch instruction. */
2537 else if (target < address)
2538 target = fragP->fr_next->fr_address + stretch;
2539 }
2540 }
2541
2542 aim = target - address - fragP->fr_fix;
2543 #ifdef TC_PCREL_ADJUST
2544 /* Currently only the ns32k family needs this. */
2545 aim += TC_PCREL_ADJUST (fragP);
2546 #endif
2547
2548 #ifdef md_prepare_relax_scan
2549 /* Formerly called M68K_AIM_KLUDGE. */
2550 md_prepare_relax_scan (fragP, address, aim, this_state, this_type);
2551 #endif
2552
2553 if (aim < 0)
2554 {
2555 /* Look backwards. */
2556 for (next_state = this_type->rlx_more; next_state;)
2557 if (aim >= this_type->rlx_backward)
2558 next_state = 0;
2559 else
2560 {
2561 /* Grow to next state. */
2562 this_state = next_state;
2563 this_type = table + this_state;
2564 next_state = this_type->rlx_more;
2565 }
2566 }
2567 else
2568 {
2569 /* Look forwards. */
2570 for (next_state = this_type->rlx_more; next_state;)
2571 if (aim <= this_type->rlx_forward)
2572 next_state = 0;
2573 else
2574 {
2575 /* Grow to next state. */
2576 this_state = next_state;
2577 this_type = table + this_state;
2578 next_state = this_type->rlx_more;
2579 }
2580 }
2581
2582 growth = this_type->rlx_length - start_type->rlx_length;
2583 if (growth != 0)
2584 fragP->fr_subtype = this_state;
2585 return growth;
2586 }
2587
2588 #endif /* defined (TC_GENERIC_RELAX_TABLE) */
2589
2590 /* Relax_align. Advance location counter to next address that has 'alignment'
2591 lowest order bits all 0s, return size of adjustment made. */
2592 static relax_addressT
2593 relax_align (relax_addressT address, /* Address now. */
2594 int alignment /* Alignment (binary). */)
2595 {
2596 relax_addressT mask;
2597 relax_addressT new_address;
2598
2599 mask = ~((relax_addressT) ~0 << alignment);
2600 new_address = (address + mask) & (~mask);
2601 #ifdef LINKER_RELAXING_SHRINKS_ONLY
2602 if (linkrelax)
2603 /* We must provide lots of padding, so the linker can discard it
2604 when needed. The linker will not add extra space, ever. */
2605 new_address += (1 << alignment);
2606 #endif
2607 return (new_address - address);
2608 }
2609
2610 /* Now we have a segment, not a crowd of sub-segments, we can make
2611 fr_address values.
2612
2613 Relax the frags.
2614
2615 After this, all frags in this segment have addresses that are correct
2616 within the segment. Since segments live in different file addresses,
2617 these frag addresses may not be the same as final object-file
2618 addresses. */
2619
2620 int
2621 relax_segment (struct frag *segment_frag_root, segT segment, int pass)
2622 {
2623 unsigned long frag_count;
2624 struct frag *fragP;
2625 relax_addressT address;
2626 int region;
2627 int ret;
2628
2629 /* In case md_estimate_size_before_relax() wants to make fixSs. */
2630 subseg_change (segment, 0);
2631
2632 /* For each frag in segment: count and store (a 1st guess of)
2633 fr_address. */
2634 address = 0;
2635 region = 0;
2636 for (frag_count = 0, fragP = segment_frag_root;
2637 fragP;
2638 fragP = fragP->fr_next, frag_count ++)
2639 {
2640 fragP->region = region;
2641 fragP->relax_marker = 0;
2642 fragP->fr_address = address;
2643 address += fragP->fr_fix;
2644
2645 switch (fragP->fr_type)
2646 {
2647 case rs_fill:
2648 address += fragP->fr_offset * fragP->fr_var;
2649 break;
2650
2651 case rs_align:
2652 case rs_align_code:
2653 case rs_align_test:
2654 {
2655 addressT offset = relax_align (address, (int) fragP->fr_offset);
2656
2657 if (fragP->fr_subtype != 0 && offset > fragP->fr_subtype)
2658 offset = 0;
2659
2660 if (offset % fragP->fr_var != 0)
2661 {
2662 as_bad_where (fragP->fr_file, fragP->fr_line,
2663 ngettext ("alignment padding (%lu byte) "
2664 "not a multiple of %ld",
2665 "alignment padding (%lu bytes) "
2666 "not a multiple of %ld",
2667 (unsigned long) offset),
2668 (unsigned long) offset, (long) fragP->fr_var);
2669 offset -= (offset % fragP->fr_var);
2670 }
2671
2672 address += offset;
2673 region += 1;
2674 }
2675 break;
2676
2677 case rs_org:
2678 /* Assume .org is nugatory. It will grow with 1st relax. */
2679 region += 1;
2680 break;
2681
2682 case rs_space:
2683 case rs_space_nop:
2684 break;
2685
2686 case rs_machine_dependent:
2687 /* If fr_symbol is an expression, this call to
2688 resolve_symbol_value sets up the correct segment, which will
2689 likely be needed in md_estimate_size_before_relax. */
2690 if (fragP->fr_symbol)
2691 resolve_symbol_value (fragP->fr_symbol);
2692
2693 address += md_estimate_size_before_relax (fragP, segment);
2694 break;
2695
2696 #ifndef WORKING_DOT_WORD
2697 /* Broken words don't concern us yet. */
2698 case rs_broken_word:
2699 break;
2700 #endif
2701
2702 case rs_leb128:
2703 /* Initial guess is always 1; doing otherwise can result in
2704 stable solutions that are larger than the minimum. */
2705 address += fragP->fr_offset = 1;
2706 break;
2707
2708 case rs_cfa:
2709 address += eh_frame_estimate_size_before_relax (fragP);
2710 break;
2711
2712 case rs_dwarf2dbg:
2713 address += dwarf2dbg_estimate_size_before_relax (fragP);
2714 break;
2715
2716 default:
2717 BAD_CASE (fragP->fr_type);
2718 break;
2719 }
2720 }
2721
2722 /* Do relax(). */
2723 {
2724 unsigned long max_iterations;
2725
2726 /* Cumulative address adjustment. */
2727 offsetT stretch;
2728
2729 /* Have we made any adjustment this pass? We can't just test
2730 stretch because one piece of code may have grown and another
2731 shrank. */
2732 int stretched;
2733
2734 /* Most horrible, but gcc may give us some exception data that
2735 is impossible to assemble, of the form
2736
2737 .align 4
2738 .byte 0, 0
2739 .uleb128 end - start
2740 start:
2741 .space 128*128 - 1
2742 .align 4
2743 end:
2744
2745 If the leb128 is two bytes in size, then end-start is 128*128,
2746 which requires a three byte leb128. If the leb128 is three
2747 bytes in size, then end-start is 128*128-1, which requires a
2748 two byte leb128. We work around this dilemma by inserting
2749 an extra 4 bytes of alignment just after the .align. This
2750 works because the data after the align is accessed relative to
2751 the end label.
2752
2753 This counter is used in a tiny state machine to detect
2754 whether a leb128 followed by an align is impossible to
2755 relax. */
2756 int rs_leb128_fudge = 0;
2757
2758 /* We want to prevent going into an infinite loop where one frag grows
2759 depending upon the location of a symbol which is in turn moved by
2760 the growing frag. eg:
2761
2762 foo = .
2763 .org foo+16
2764 foo = .
2765
2766 So we dictate that this algorithm can be at most O2. */
2767 max_iterations = frag_count * frag_count;
2768 /* Check for overflow. */
2769 if (max_iterations < frag_count)
2770 max_iterations = frag_count;
2771
2772 ret = 0;
2773 do
2774 {
2775 stretch = 0;
2776 stretched = 0;
2777
2778 for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next)
2779 {
2780 offsetT growth = 0;
2781 addressT was_address;
2782 offsetT offset;
2783 symbolS *symbolP;
2784
2785 fragP->relax_marker ^= 1;
2786 was_address = fragP->fr_address;
2787 address = fragP->fr_address += stretch;
2788 symbolP = fragP->fr_symbol;
2789 offset = fragP->fr_offset;
2790
2791 switch (fragP->fr_type)
2792 {
2793 case rs_fill: /* .fill never relaxes. */
2794 growth = 0;
2795 break;
2796
2797 #ifndef WORKING_DOT_WORD
2798 /* JF: This is RMS's idea. I do *NOT* want to be blamed
2799 for it I do not want to write it. I do not want to have
2800 anything to do with it. This is not the proper way to
2801 implement this misfeature. */
2802 case rs_broken_word:
2803 {
2804 struct broken_word *lie;
2805 struct broken_word *untruth;
2806
2807 /* Yes this is ugly (storing the broken_word pointer
2808 in the symbol slot). Still, this whole chunk of
2809 code is ugly, and I don't feel like doing anything
2810 about it. Think of it as stubbornness in action. */
2811 growth = 0;
2812 for (lie = (struct broken_word *) (fragP->fr_symbol);
2813 lie && lie->dispfrag == fragP;
2814 lie = lie->next_broken_word)
2815 {
2816
2817 if (lie->added)
2818 continue;
2819
2820 offset = (S_GET_VALUE (lie->add)
2821 + lie->addnum
2822 - S_GET_VALUE (lie->sub));
2823 if (offset <= -32768 || offset >= 32767)
2824 {
2825 if (flag_warn_displacement)
2826 {
2827 char buf[50];
2828 sprint_value (buf, (addressT) lie->addnum);
2829 as_warn_where (fragP->fr_file, fragP->fr_line,
2830 _(".word %s-%s+%s didn't fit"),
2831 S_GET_NAME (lie->add),
2832 S_GET_NAME (lie->sub),
2833 buf);
2834 }
2835 if (fragP->fr_subtype == 0)
2836 {
2837 fragP->fr_subtype++;
2838 growth += md_short_jump_size;
2839 }
2840
2841 /* Redirect *all* words of this table with the same
2842 target, lest we have to handle the case where the
2843 same target but with a offset that fits on this
2844 round overflows at the next relaxation round. */
2845 for (untruth = (struct broken_word *) (fragP->fr_symbol);
2846 untruth && untruth->dispfrag == lie->dispfrag;
2847 untruth = untruth->next_broken_word)
2848 if ((symbol_get_frag (untruth->add)
2849 == symbol_get_frag (lie->add))
2850 && (S_GET_VALUE (untruth->add)
2851 == S_GET_VALUE (lie->add)))
2852 {
2853 untruth->added = 2;
2854 untruth->use_jump = lie;
2855 }
2856
2857 lie->added = 1;
2858 growth += md_long_jump_size;
2859 }
2860 }
2861
2862 break;
2863 } /* case rs_broken_word */
2864 #endif
2865 case rs_align:
2866 case rs_align_code:
2867 case rs_align_test:
2868 {
2869 addressT oldoff, newoff;
2870
2871 oldoff = relax_align (was_address + fragP->fr_fix,
2872 (int) offset);
2873 newoff = relax_align (address + fragP->fr_fix,
2874 (int) offset);
2875
2876 if (fragP->fr_subtype != 0)
2877 {
2878 if (oldoff > fragP->fr_subtype)
2879 oldoff = 0;
2880 if (newoff > fragP->fr_subtype)
2881 newoff = 0;
2882 }
2883
2884 growth = newoff - oldoff;
2885
2886 /* If this align happens to follow a leb128 and
2887 we have determined that the leb128 is bouncing
2888 in size, then break the cycle by inserting an
2889 extra alignment. */
2890 if (growth < 0
2891 && (rs_leb128_fudge & 16) != 0
2892 && (rs_leb128_fudge & 15) >= 2)
2893 {
2894 segment_info_type *seginfo = seg_info (segment);
2895 struct obstack *ob = &seginfo->frchainP->frch_obstack;
2896 struct frag *newf;
2897
2898 newf = frag_alloc (ob);
2899 obstack_blank_fast (ob, fragP->fr_var);
2900 obstack_finish (ob);
2901 memcpy (newf, fragP, SIZEOF_STRUCT_FRAG);
2902 memcpy (newf->fr_literal,
2903 fragP->fr_literal + fragP->fr_fix,
2904 fragP->fr_var);
2905 newf->fr_type = rs_fill;
2906 newf->fr_address = address + fragP->fr_fix + newoff;
2907 newf->fr_fix = 0;
2908 newf->fr_offset = (((offsetT) 1 << fragP->fr_offset)
2909 / fragP->fr_var);
2910 if (newf->fr_offset * newf->fr_var
2911 != (offsetT) 1 << fragP->fr_offset)
2912 {
2913 newf->fr_offset = (offsetT) 1 << fragP->fr_offset;
2914 newf->fr_var = 1;
2915 }
2916 /* Include size of new frag in GROWTH. */
2917 growth += newf->fr_offset * newf->fr_var;
2918 /* Adjust the new frag address for the amount
2919 we'll add when we process the new frag. */
2920 newf->fr_address -= stretch + growth;
2921 newf->relax_marker ^= 1;
2922 fragP->fr_next = newf;
2923 #ifdef DEBUG
2924 as_warn (_("padding added"));
2925 #endif
2926 }
2927 }
2928 break;
2929
2930 case rs_org:
2931 {
2932 addressT target = offset;
2933 addressT after;
2934
2935 if (symbolP)
2936 {
2937 /* Convert from an actual address to an octet offset
2938 into the section. Here it is assumed that the
2939 section's VMA is zero, and can omit subtracting it
2940 from the symbol's value to get the address offset. */
2941 know (S_GET_SEGMENT (symbolP)->vma == 0);
2942 target += S_GET_VALUE (symbolP) * OCTETS_PER_BYTE;
2943 }
2944
2945 know (fragP->fr_next);
2946 after = fragP->fr_next->fr_address + stretch;
2947 growth = target - after;
2948
2949 /* Growth may be negative, but variable part of frag
2950 cannot have fewer than 0 chars. That is, we can't
2951 .org backwards. */
2952 if (address + fragP->fr_fix > target)
2953 {
2954 growth = 0;
2955
2956 /* Don't error on first few frag relax passes.
2957 The symbol might be an expression involving
2958 symbol values from other sections. If those
2959 sections have not yet been processed their
2960 frags will all have zero addresses, so we
2961 will calculate incorrect values for them. The
2962 number of passes we allow before giving an
2963 error is somewhat arbitrary. It should be at
2964 least one, with larger values requiring
2965 increasingly contrived dependencies between
2966 frags to trigger a false error. */
2967 if (pass < 2)
2968 {
2969 /* Force another pass. */
2970 ret = 1;
2971 break;
2972 }
2973
2974 as_bad_where (fragP->fr_file, fragP->fr_line,
2975 _("attempt to move .org backwards"));
2976
2977 /* We've issued an error message. Change the
2978 frag to avoid cascading errors. */
2979 fragP->fr_type = rs_align;
2980 fragP->fr_subtype = 0;
2981 fragP->fr_offset = 0;
2982 fragP->fr_fix = after - address;
2983 }
2984 }
2985 break;
2986
2987 case rs_space:
2988 case rs_space_nop:
2989 growth = 0;
2990 if (symbolP)
2991 {
2992 offsetT amount;
2993
2994 amount = S_GET_VALUE (symbolP);
2995 if (S_GET_SEGMENT (symbolP) != absolute_section
2996 || S_IS_COMMON (symbolP)
2997 || ! S_IS_DEFINED (symbolP))
2998 {
2999 as_bad_where (fragP->fr_file, fragP->fr_line,
3000 _(".space specifies non-absolute value"));
3001 /* Prevent repeat of this error message. */
3002 fragP->fr_symbol = 0;
3003 }
3004 else if (amount < 0)
3005 {
3006 /* Don't error on first few frag relax passes.
3007 See rs_org comment for a longer explanation. */
3008 if (pass < 2)
3009 {
3010 ret = 1;
3011 break;
3012 }
3013
3014 as_warn_where (fragP->fr_file, fragP->fr_line,
3015 _(".space, .nops or .fill with negative value, ignored"));
3016 fragP->fr_symbol = 0;
3017 }
3018 else
3019 growth = (was_address + fragP->fr_fix + amount
3020 - fragP->fr_next->fr_address);
3021 }
3022 break;
3023
3024 case rs_machine_dependent:
3025 #ifdef md_relax_frag
3026 growth = md_relax_frag (segment, fragP, stretch);
3027 #else
3028 #ifdef TC_GENERIC_RELAX_TABLE
3029 /* The default way to relax a frag is to look through
3030 TC_GENERIC_RELAX_TABLE. */
3031 growth = relax_frag (segment, fragP, stretch);
3032 #endif /* TC_GENERIC_RELAX_TABLE */
3033 #endif
3034 break;
3035
3036 case rs_leb128:
3037 {
3038 valueT value;
3039 offsetT size;
3040
3041 value = resolve_symbol_value (fragP->fr_symbol);
3042 size = sizeof_leb128 (value, fragP->fr_subtype);
3043 growth = size - fragP->fr_offset;
3044 fragP->fr_offset = size;
3045 }
3046 break;
3047
3048 case rs_cfa:
3049 growth = eh_frame_relax_frag (fragP);
3050 break;
3051
3052 case rs_dwarf2dbg:
3053 growth = dwarf2dbg_relax_frag (fragP);
3054 break;
3055
3056 default:
3057 BAD_CASE (fragP->fr_type);
3058 break;
3059 }
3060 if (growth)
3061 {
3062 stretch += growth;
3063 stretched = 1;
3064 if (fragP->fr_type == rs_leb128)
3065 rs_leb128_fudge += 16;
3066 else if (fragP->fr_type == rs_align
3067 && (rs_leb128_fudge & 16) != 0
3068 && stretch == 0)
3069 rs_leb128_fudge += 16;
3070 else
3071 rs_leb128_fudge = 0;
3072 }
3073 }
3074
3075 if (stretch == 0
3076 && (rs_leb128_fudge & 16) == 0
3077 && (rs_leb128_fudge & -16) != 0)
3078 rs_leb128_fudge += 1;
3079 else
3080 rs_leb128_fudge = 0;
3081 }
3082 /* Until nothing further to relax. */
3083 while (stretched && -- max_iterations);
3084
3085 if (stretched)
3086 as_fatal (_("Infinite loop encountered whilst attempting to compute the addresses of symbols in section %s"),
3087 segment_name (segment));
3088 }
3089
3090 for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next)
3091 if (fragP->last_fr_address != fragP->fr_address)
3092 {
3093 fragP->last_fr_address = fragP->fr_address;
3094 ret = 1;
3095 }
3096 return ret;
3097 }
3098
3099 void
3100 number_to_chars_bigendian (char *buf, valueT val, int n)
3101 {
3102 if (n <= 0)
3103 abort ();
3104 while (n--)
3105 {
3106 buf[n] = val & 0xff;
3107 val >>= 8;
3108 }
3109 }
3110
3111 void
3112 number_to_chars_littleendian (char *buf, valueT val, int n)
3113 {
3114 if (n <= 0)
3115 abort ();
3116 while (n--)
3117 {
3118 *buf++ = val & 0xff;
3119 val >>= 8;
3120 }
3121 }
3122
3123 void
3124 write_print_statistics (FILE *file)
3125 {
3126 fprintf (file, "fixups: %d\n", n_fixups);
3127 }
3128
3129 /* For debugging. */
3130 extern int indent_level;
3131
3132 void
3133 print_fixup (fixS *fixp)
3134 {
3135 indent_level = 1;
3136 fprintf (stderr, "fix ");
3137 fprintf_vma (stderr, (bfd_vma)((bfd_hostptr_t) fixp));
3138 fprintf (stderr, " %s:%d",fixp->fx_file, fixp->fx_line);
3139 if (fixp->fx_pcrel)
3140 fprintf (stderr, " pcrel");
3141 if (fixp->fx_pcrel_adjust)
3142 fprintf (stderr, " pcrel_adjust=%d", fixp->fx_pcrel_adjust);
3143 if (fixp->fx_tcbit)
3144 fprintf (stderr, " tcbit");
3145 if (fixp->fx_done)
3146 fprintf (stderr, " done");
3147 fprintf (stderr, "\n size=%d frag=", fixp->fx_size);
3148 fprintf_vma (stderr, (bfd_vma) ((bfd_hostptr_t) fixp->fx_frag));
3149 fprintf (stderr, " where=%ld offset=%lx addnumber=%lx",
3150 (long) fixp->fx_where,
3151 (unsigned long) fixp->fx_offset,
3152 (unsigned long) fixp->fx_addnumber);
3153 fprintf (stderr, "\n %s (%d)", bfd_get_reloc_code_name (fixp->fx_r_type),
3154 fixp->fx_r_type);
3155 if (fixp->fx_addsy)
3156 {
3157 fprintf (stderr, "\n +<");
3158 print_symbol_value_1 (stderr, fixp->fx_addsy);
3159 fprintf (stderr, ">");
3160 }
3161 if (fixp->fx_subsy)
3162 {
3163 fprintf (stderr, "\n -<");
3164 print_symbol_value_1 (stderr, fixp->fx_subsy);
3165 fprintf (stderr, ">");
3166 }
3167 fprintf (stderr, "\n");
3168 #ifdef TC_FIX_DATA_PRINT
3169 TC_FIX_DATA_PRINT (stderr, fixp);
3170 #endif
3171 }
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