1 /* write.c - emit .o file
2 Copyright (C) 1986-2015 Free Software Foundation, Inc.
4 This file is part of GAS, the GNU Assembler.
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)
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.
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
21 /* This thing should be set up to do byteordering correctly. But... */
26 #include "output-file.h"
27 #include "dwarf2dbg.h"
29 #include "compress-debug.h"
31 #ifndef TC_FORCE_RELOCATION
32 #define TC_FORCE_RELOCATION(FIX) \
33 (generic_force_reloc (FIX))
36 #ifndef TC_FORCE_RELOCATION_ABS
37 #define TC_FORCE_RELOCATION_ABS(FIX) \
38 (TC_FORCE_RELOCATION (FIX))
41 #ifndef TC_FORCE_RELOCATION_LOCAL
42 #define TC_FORCE_RELOCATION_LOCAL(FIX) \
44 || TC_FORCE_RELOCATION (FIX))
47 #ifndef TC_FORCE_RELOCATION_SUB_SAME
48 #define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEG) \
52 #ifndef md_register_arithmetic
53 # define md_register_arithmetic 1
56 #ifndef TC_FORCE_RELOCATION_SUB_ABS
57 #define TC_FORCE_RELOCATION_SUB_ABS(FIX, SEG) \
58 (!md_register_arithmetic && (SEG) == reg_section)
61 #ifndef TC_FORCE_RELOCATION_SUB_LOCAL
63 #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG) \
64 (!md_register_arithmetic && (SEG) == reg_section)
66 #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG) 1
70 #ifndef TC_VALIDATE_FIX_SUB
71 #ifdef UNDEFINED_DIFFERENCE_OK
72 /* The PA needs this for PIC code generation. */
73 #define TC_VALIDATE_FIX_SUB(FIX, SEG) \
74 (md_register_arithmetic || (SEG) != reg_section)
76 #define TC_VALIDATE_FIX_SUB(FIX, SEG) \
77 ((md_register_arithmetic || (SEG) != reg_section) \
78 && ((FIX)->fx_r_type == BFD_RELOC_GPREL32 \
79 || (FIX)->fx_r_type == BFD_RELOC_GPREL16))
83 #ifndef TC_LINKRELAX_FIXUP
84 #define TC_LINKRELAX_FIXUP(SEG) 1
87 #ifndef MD_APPLY_SYM_VALUE
88 #define MD_APPLY_SYM_VALUE(FIX) 1
91 #ifndef TC_FINALIZE_SYMS_BEFORE_SIZE_SEG
92 #define TC_FINALIZE_SYMS_BEFORE_SIZE_SEG 1
95 #ifndef MD_PCREL_FROM_SECTION
96 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from (FIX)
100 #define TC_FAKE_LABEL(NAME) (strcmp ((NAME), FAKE_LABEL_NAME) == 0)
103 /* Positive values of TC_FX_SIZE_SLACK allow a target to define
104 fixups that far past the end of a frag. Having such fixups
105 is of course most most likely a bug in setting fx_size correctly.
106 A negative value disables the fixup check entirely, which is
107 appropriate for something like the Renesas / SuperH SH_COUNT
109 #ifndef TC_FX_SIZE_SLACK
110 #define TC_FX_SIZE_SLACK(FIX) 0
113 /* Used to control final evaluation of expressions. */
114 int finalize_syms = 0;
116 int symbol_table_frozen;
118 symbolS *abs_section_sym;
120 /* Remember the value of dot when parsing expressions. */
123 /* The frag that dot_value is based from. */
126 /* Relocs generated by ".reloc" pseudo. */
127 struct reloc_list* reloc_list;
129 void print_fixup (fixS *);
131 /* We generally attach relocs to frag chains. However, after we have
132 chained these all together into a segment, any relocs we add after
133 that must be attached to a segment. This will include relocs added
134 in md_estimate_size_for_relax, for example. */
135 static int frags_chained = 0;
139 #define RELOC_ENUM enum bfd_reloc_code_real
141 /* Create a fixS in obstack 'notes'. */
144 fix_new_internal (fragS *frag, /* Which frag? */
145 int where, /* Where in that frag? */
146 int size, /* 1, 2, or 4 usually. */
147 symbolS *add_symbol, /* X_add_symbol. */
148 symbolS *sub_symbol, /* X_op_symbol. */
149 offsetT offset, /* X_add_number. */
150 int pcrel, /* TRUE if PC-relative relocation. */
151 RELOC_ENUM r_type /* Relocation type. */,
152 int at_beginning) /* Add to the start of the list? */
158 fixP = (fixS *) obstack_alloc (¬es, sizeof (fixS));
160 fixP->fx_frag = frag;
161 fixP->fx_where = where;
162 fixP->fx_size = size;
163 /* We've made fx_size a narrow field; check that it's wide enough. */
164 if (fixP->fx_size != size)
166 as_bad (_("field fx_size too small to hold %d"), size);
169 fixP->fx_addsy = add_symbol;
170 fixP->fx_subsy = sub_symbol;
171 fixP->fx_offset = offset;
172 fixP->fx_dot_value = dot_value;
173 fixP->fx_dot_frag = dot_frag;
174 fixP->fx_pcrel = pcrel;
175 fixP->fx_r_type = r_type;
176 fixP->fx_im_disp = 0;
177 fixP->fx_pcrel_adjust = 0;
178 fixP->fx_bit_fixP = 0;
179 fixP->fx_addnumber = 0;
183 fixP->fx_no_overflow = 0;
187 fixP->fx_cgen.insn = NULL;
188 fixP->fx_cgen.opinfo = 0;
192 TC_INIT_FIX_DATA (fixP);
195 as_where (&fixP->fx_file, &fixP->fx_line);
199 fixS **seg_fix_rootP = (frags_chained
200 ? &seg_info (now_seg)->fix_root
201 : &frchain_now->fix_root);
202 fixS **seg_fix_tailP = (frags_chained
203 ? &seg_info (now_seg)->fix_tail
204 : &frchain_now->fix_tail);
208 fixP->fx_next = *seg_fix_rootP;
209 *seg_fix_rootP = fixP;
210 if (fixP->fx_next == NULL)
211 *seg_fix_tailP = fixP;
215 fixP->fx_next = NULL;
217 (*seg_fix_tailP)->fx_next = fixP;
219 *seg_fix_rootP = fixP;
220 *seg_fix_tailP = fixP;
227 /* Create a fixup relative to a symbol (plus a constant). */
230 fix_new (fragS *frag, /* Which frag? */
231 int where, /* Where in that frag? */
232 int size, /* 1, 2, or 4 usually. */
233 symbolS *add_symbol, /* X_add_symbol. */
234 offsetT offset, /* X_add_number. */
235 int pcrel, /* TRUE if PC-relative relocation. */
236 RELOC_ENUM r_type /* Relocation type. */)
238 return fix_new_internal (frag, where, size, add_symbol,
239 (symbolS *) NULL, offset, pcrel, r_type, FALSE);
242 /* Create a fixup for an expression. Currently we only support fixups
243 for difference expressions. That is itself more than most object
244 file formats support anyhow. */
247 fix_new_exp (fragS *frag, /* Which frag? */
248 int where, /* Where in that frag? */
249 int size, /* 1, 2, or 4 usually. */
250 expressionS *exp, /* Expression. */
251 int pcrel, /* TRUE if PC-relative relocation. */
252 RELOC_ENUM r_type /* Relocation type. */)
264 as_bad (_("register value used as expression"));
268 /* This comes up when _GLOBAL_OFFSET_TABLE_+(.-L0) is read, if
269 the difference expression cannot immediately be reduced. */
271 symbolS *stmp = make_expr_symbol (exp);
273 exp->X_op = O_symbol;
274 exp->X_op_symbol = 0;
275 exp->X_add_symbol = stmp;
276 exp->X_add_number = 0;
278 return fix_new_exp (frag, where, size, exp, pcrel, r_type);
282 add = exp->X_add_symbol;
283 off = exp->X_add_number;
284 r_type = BFD_RELOC_RVA;
288 sub = exp->X_add_symbol;
289 off = exp->X_add_number;
293 sub = exp->X_op_symbol;
296 add = exp->X_add_symbol;
299 off = exp->X_add_number;
303 add = make_expr_symbol (exp);
307 return fix_new_internal (frag, where, size, add, sub, off, pcrel,
311 /* Create a fixup at the beginning of FRAG. The arguments are the same
312 as for fix_new, except that WHERE is implicitly 0. */
315 fix_at_start (fragS *frag, int size, symbolS *add_symbol,
316 offsetT offset, int pcrel, RELOC_ENUM r_type)
318 return fix_new_internal (frag, 0, size, add_symbol,
319 (symbolS *) NULL, offset, pcrel, r_type, TRUE);
322 /* Generic function to determine whether a fixup requires a relocation. */
324 generic_force_reloc (fixS *fix)
326 if (fix->fx_r_type == BFD_RELOC_VTABLE_INHERIT
327 || fix->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
330 if (fix->fx_addsy == NULL)
333 return S_FORCE_RELOC (fix->fx_addsy, fix->fx_subsy == NULL);
336 /* Append a string onto another string, bumping the pointer along. */
338 append (char **charPP, char *fromP, unsigned long length)
340 /* Don't trust memcpy() of 0 chars. */
344 memcpy (*charPP, fromP, length);
348 /* This routine records the largest alignment seen for each segment.
349 If the beginning of the segment is aligned on the worst-case
350 boundary, all of the other alignments within it will work. At
351 least one object format really uses this info. */
354 record_alignment (/* Segment to which alignment pertains. */
356 /* Alignment, as a power of 2 (e.g., 1 => 2-byte
357 boundary, 2 => 4-byte boundary, etc.) */
360 if (seg == absolute_section)
363 if ((unsigned int) align > bfd_get_section_alignment (stdoutput, seg))
364 bfd_set_section_alignment (stdoutput, seg, align);
368 get_recorded_alignment (segT seg)
370 if (seg == absolute_section)
373 return bfd_get_section_alignment (stdoutput, seg);
376 /* Reset the section indices after removing the gas created sections. */
379 renumber_sections (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *countparg)
381 int *countp = (int *) countparg;
383 sec->index = *countp;
388 chain_frchains_together_1 (segT section, struct frchain *frchp)
390 fragS dummy, *prev_frag = &dummy;
391 fixS fix_dummy, *prev_fix = &fix_dummy;
393 for (; frchp; frchp = frchp->frch_next)
395 prev_frag->fr_next = frchp->frch_root;
396 prev_frag = frchp->frch_last;
397 gas_assert (prev_frag->fr_type != 0);
398 if (frchp->fix_root != (fixS *) NULL)
400 if (seg_info (section)->fix_root == (fixS *) NULL)
401 seg_info (section)->fix_root = frchp->fix_root;
402 prev_fix->fx_next = frchp->fix_root;
403 seg_info (section)->fix_tail = frchp->fix_tail;
404 prev_fix = frchp->fix_tail;
407 gas_assert (prev_frag != &dummy
408 && prev_frag->fr_type != 0);
409 prev_frag->fr_next = 0;
414 chain_frchains_together (bfd *abfd ATTRIBUTE_UNUSED,
416 void *xxx ATTRIBUTE_UNUSED)
418 segment_info_type *info;
420 /* BFD may have introduced its own sections without using
421 subseg_new, so it is possible that seg_info is NULL. */
422 info = seg_info (section);
423 if (info != (segment_info_type *) NULL)
424 info->frchainP->frch_last
425 = chain_frchains_together_1 (section, info->frchainP);
427 /* Now that we've chained the frags together, we must add new fixups
428 to the segment, not to the frag chain. */
433 cvt_frag_to_fill (segT sec ATTRIBUTE_UNUSED, fragS *fragP)
435 switch (fragP->fr_type)
443 HANDLE_ALIGN (fragP);
445 know (fragP->fr_next != NULL);
446 fragP->fr_offset = (fragP->fr_next->fr_address
448 - fragP->fr_fix) / fragP->fr_var;
449 if (fragP->fr_offset < 0)
451 as_bad_where (fragP->fr_file, fragP->fr_line,
452 _("attempt to .org/.space backwards? (%ld)"),
453 (long) fragP->fr_offset);
454 fragP->fr_offset = 0;
456 fragP->fr_type = rs_fill;
464 valueT value = S_GET_VALUE (fragP->fr_symbol);
467 size = output_leb128 (fragP->fr_literal + fragP->fr_fix, value,
470 fragP->fr_fix += size;
471 fragP->fr_type = rs_fill;
473 fragP->fr_offset = 0;
474 fragP->fr_symbol = NULL;
479 eh_frame_convert_frag (fragP);
483 dwarf2dbg_convert_frag (fragP);
486 case rs_machine_dependent:
487 md_convert_frag (stdoutput, sec, fragP);
489 gas_assert (fragP->fr_next == NULL
490 || ((offsetT) (fragP->fr_next->fr_address - fragP->fr_address)
493 /* After md_convert_frag, we make the frag into a ".space 0".
494 md_convert_frag() should set up any fixSs and constants
499 #ifndef WORKING_DOT_WORD
502 struct broken_word *lie;
504 if (fragP->fr_subtype)
506 fragP->fr_fix += md_short_jump_size;
507 for (lie = (struct broken_word *) (fragP->fr_symbol);
508 lie && lie->dispfrag == fragP;
509 lie = lie->next_broken_word)
511 fragP->fr_fix += md_long_jump_size;
519 BAD_CASE (fragP->fr_type);
523 md_frag_check (fragP);
527 struct relax_seg_info
534 relax_seg (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *xxx)
536 segment_info_type *seginfo = seg_info (sec);
537 struct relax_seg_info *info = (struct relax_seg_info *) xxx;
539 if (seginfo && seginfo->frchainP
540 && relax_segment (seginfo->frchainP->frch_root, sec, info->pass))
545 size_seg (bfd *abfd, asection *sec, void *xxx ATTRIBUTE_UNUSED)
549 segment_info_type *seginfo;
551 valueT size, newsize;
553 subseg_change (sec, 0);
555 seginfo = seg_info (sec);
556 if (seginfo && seginfo->frchainP)
558 for (fragp = seginfo->frchainP->frch_root; fragp; fragp = fragp->fr_next)
559 cvt_frag_to_fill (sec, fragp);
560 for (fragp = seginfo->frchainP->frch_root;
562 fragp = fragp->fr_next)
563 /* Walk to last elt. */
565 size = fragp->fr_address + fragp->fr_fix;
570 flags = bfd_get_section_flags (abfd, sec);
571 if (size == 0 && bfd_get_section_size (sec) != 0 &&
572 (flags & SEC_HAS_CONTENTS) != 0)
575 if (size > 0 && ! seginfo->bss)
576 flags |= SEC_HAS_CONTENTS;
579 x = bfd_set_section_flags (abfd, sec, flags);
582 newsize = md_section_align (sec, size);
583 x = bfd_set_section_size (abfd, sec, newsize);
586 /* If the size had to be rounded up, add some padding in the last
588 gas_assert (newsize >= size);
591 fragS *last = seginfo->frchainP->frch_last;
592 fragp = seginfo->frchainP->frch_root;
593 while (fragp->fr_next != last)
594 fragp = fragp->fr_next;
595 last->fr_address = size;
596 if ((newsize - size) % fragp->fr_var == 0)
597 fragp->fr_offset += (newsize - size) / fragp->fr_var;
599 /* If we hit this abort, it's likely due to subsegs_finish not
600 providing sufficient alignment on the last frag, and the
601 machine dependent code using alignment frags with fr_var
606 #ifdef tc_frob_section
607 tc_frob_section (sec);
609 #ifdef obj_frob_section
610 obj_frob_section (sec);
616 dump_section_relocs (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, FILE *stream)
618 segment_info_type *seginfo = seg_info (sec);
619 fixS *fixp = seginfo->fix_root;
624 fprintf (stream, "sec %s relocs:\n", sec->name);
627 symbolS *s = fixp->fx_addsy;
629 fprintf (stream, " %08lx: type %d ", (unsigned long) fixp,
630 (int) fixp->fx_r_type);
632 fprintf (stream, "no sym\n");
635 print_symbol_value_1 (stream, s);
636 fprintf (stream, "\n");
638 fixp = fixp->fx_next;
642 #define dump_section_relocs(ABFD,SEC,STREAM) ((void) 0)
645 #ifndef EMIT_SECTION_SYMBOLS
646 #define EMIT_SECTION_SYMBOLS 1
649 /* Resolve U.A.OFFSET_SYM and U.A.SYM fields of RELOC_LIST entries,
650 and check for validity. Convert RELOC_LIST from using U.A fields
653 resolve_reloc_expr_symbols (void)
655 bfd_vma addr_mask = 1;
656 struct reloc_list *r;
658 /* Avoid a shift by the width of type. */
659 addr_mask <<= bfd_arch_bits_per_address (stdoutput) - 1;
663 for (r = reloc_list; r; r = r->next)
665 reloc_howto_type *howto = r->u.a.howto;
668 bfd_vma offset, addend;
671 resolve_symbol_value (r->u.a.offset_sym);
672 symval = symbol_get_value_expression (r->u.a.offset_sym);
676 if (symval->X_op == O_constant)
677 sym = r->u.a.offset_sym;
678 else if (symval->X_op == O_symbol)
680 sym = symval->X_add_symbol;
681 offset = symval->X_add_number;
682 symval = symbol_get_value_expression (symval->X_add_symbol);
685 || symval->X_op != O_constant
686 || (sec = S_GET_SEGMENT (sym)) == NULL
687 || !SEG_NORMAL (sec))
689 as_bad_where (r->file, r->line, _("invalid offset expression"));
693 offset += S_GET_VALUE (sym);
696 addend = r->u.a.addend;
697 if (r->u.a.sym != NULL)
699 resolve_symbol_value (r->u.a.sym);
700 symval = symbol_get_value_expression (r->u.a.sym);
701 if (symval->X_op == O_constant)
703 else if (symval->X_op == O_symbol)
705 sym = symval->X_add_symbol;
706 addend += symval->X_add_number;
707 symval = symbol_get_value_expression (symval->X_add_symbol);
709 if (symval->X_op != O_constant)
711 as_bad_where (r->file, r->line, _("invalid reloc expression"));
714 else if (sym != NULL)
716 /* Convert relocs against local symbols to refer to the
717 corresponding section symbol plus offset instead. Keep
718 PC-relative relocs of the REL variety intact though to
719 prevent the offset from overflowing the relocated field,
720 unless it has enough bits to cover the whole address
722 if (S_IS_LOCAL (sym) && !symbol_section_p (sym)
724 || (howto->partial_inplace
725 && (!howto->pc_relative
726 || howto->src_mask == addr_mask))))
728 asection *symsec = S_GET_SEGMENT (sym);
729 if (!(((symsec->flags & SEC_MERGE) != 0
731 || (symsec->flags & SEC_THREAD_LOCAL) != 0))
733 addend += S_GET_VALUE (sym);
734 sym = section_symbol (symsec);
737 symbol_mark_used_in_reloc (sym);
742 if (abs_section_sym == NULL)
743 abs_section_sym = section_symbol (absolute_section);
744 sym = abs_section_sym;
748 r->u.b.s = symbol_get_bfdsym (sym);
749 r->u.b.r.sym_ptr_ptr = &r->u.b.s;
750 r->u.b.r.address = offset;
751 r->u.b.r.addend = addend;
752 r->u.b.r.howto = howto;
756 /* This pass over fixups decides whether symbols can be replaced with
760 adjust_reloc_syms (bfd *abfd ATTRIBUTE_UNUSED,
762 void *xxx ATTRIBUTE_UNUSED)
764 segment_info_type *seginfo = seg_info (sec);
770 dump_section_relocs (abfd, sec, stderr);
772 for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next)
776 else if (fixp->fx_addsy)
782 fprintf (stderr, "\n\nadjusting fixup:\n");
786 sym = fixp->fx_addsy;
788 /* All symbols should have already been resolved at this
789 point. It is possible to see unresolved expression
790 symbols, though, since they are not in the regular symbol
792 resolve_symbol_value (sym);
794 if (fixp->fx_subsy != NULL)
795 resolve_symbol_value (fixp->fx_subsy);
797 /* If this symbol is equated to an undefined or common symbol,
798 convert the fixup to being against that symbol. */
799 while (symbol_equated_reloc_p (sym)
800 || S_IS_WEAKREFR (sym))
802 symbolS *newsym = symbol_get_value_expression (sym)->X_add_symbol;
805 fixp->fx_offset += symbol_get_value_expression (sym)->X_add_number;
806 fixp->fx_addsy = newsym;
810 if (symbol_mri_common_p (sym))
812 fixp->fx_offset += S_GET_VALUE (sym);
813 fixp->fx_addsy = symbol_get_value_expression (sym)->X_add_symbol;
817 /* If the symbol is undefined, common, weak, or global (ELF
818 shared libs), we can't replace it with the section symbol. */
819 if (S_FORCE_RELOC (fixp->fx_addsy, 1))
822 /* Is there some other (target cpu dependent) reason we can't adjust
823 this one? (E.g. relocations involving function addresses on
825 #ifdef tc_fix_adjustable
826 if (! tc_fix_adjustable (fixp))
830 /* Since we're reducing to section symbols, don't attempt to reduce
831 anything that's already using one. */
832 if (symbol_section_p (sym))
835 symsec = S_GET_SEGMENT (sym);
839 if (bfd_is_abs_section (symsec)
840 || symsec == reg_section)
842 /* The fixup_segment routine normally will not use this
843 symbol in a relocation. */
847 /* Don't try to reduce relocs which refer to non-local symbols
848 in .linkonce sections. It can lead to confusion when a
849 debugging section refers to a .linkonce section. I hope
850 this will always be correct. */
851 if (symsec != sec && ! S_IS_LOCAL (sym))
853 if ((symsec->flags & SEC_LINK_ONCE) != 0
855 /* The GNU toolchain uses an extension for ELF: a
856 section beginning with the magic string
857 .gnu.linkonce is a linkonce section. */
858 && strncmp (segment_name (symsec), ".gnu.linkonce",
859 sizeof ".gnu.linkonce" - 1) == 0))
863 /* Never adjust a reloc against local symbol in a merge section
864 with non-zero addend. */
865 if ((symsec->flags & SEC_MERGE) != 0
866 && (fixp->fx_offset != 0 || fixp->fx_subsy != NULL))
869 /* Never adjust a reloc against TLS local symbol. */
870 if ((symsec->flags & SEC_THREAD_LOCAL) != 0)
873 /* We refetch the segment when calling section_symbol, rather
874 than using symsec, because S_GET_VALUE may wind up changing
875 the section when it calls resolve_symbol_value. */
876 fixp->fx_offset += S_GET_VALUE (sym);
877 fixp->fx_addsy = section_symbol (S_GET_SEGMENT (sym));
879 fprintf (stderr, "\nadjusted fixup:\n");
884 dump_section_relocs (abfd, sec, stderr);
889 Go through all the fixS's in a segment and see which ones can be
890 handled now. (These consist of fixS where we have since discovered
891 the value of a symbol, or the address of the frag involved.)
892 For each one, call md_apply_fix to put the fix into the frag data.
893 Ones that we couldn't completely handle here will be output later
894 by emit_relocations. */
897 fixup_segment (fixS *fixP, segT this_segment)
901 segT add_symbol_segment = absolute_section;
903 if (fixP != NULL && abs_section_sym == NULL)
904 abs_section_sym = section_symbol (absolute_section);
906 /* If the linker is doing the relaxing, we must not do any fixups.
908 Well, strictly speaking that's not true -- we could do any that
909 are PC-relative and don't cross regions that could change size.
910 And for the i960 we might be able to turn callx/callj into bal
911 anyways in cases where we know the maximum displacement. */
912 if (linkrelax && TC_LINKRELAX_FIXUP (this_segment))
914 for (; fixP; fixP = fixP->fx_next)
917 if (fixP->fx_addsy == NULL)
919 /* There was no symbol required by this relocation.
920 However, BFD doesn't really handle relocations
921 without symbols well. So fake up a local symbol in
922 the absolute section. */
923 fixP->fx_addsy = abs_section_sym;
925 symbol_mark_used_in_reloc (fixP->fx_addsy);
926 if (fixP->fx_subsy != NULL)
927 symbol_mark_used_in_reloc (fixP->fx_subsy);
932 for (; fixP; fixP = fixP->fx_next)
935 fprintf (stderr, "\nprocessing fixup:\n");
939 fragP = fixP->fx_frag;
941 #ifdef TC_VALIDATE_FIX
942 TC_VALIDATE_FIX (fixP, this_segment, skip);
944 add_number = fixP->fx_offset;
946 if (fixP->fx_addsy != NULL)
947 add_symbol_segment = S_GET_SEGMENT (fixP->fx_addsy);
949 if (fixP->fx_subsy != NULL)
951 segT sub_symbol_segment;
952 resolve_symbol_value (fixP->fx_subsy);
953 sub_symbol_segment = S_GET_SEGMENT (fixP->fx_subsy);
954 if (fixP->fx_addsy != NULL
955 && sub_symbol_segment == add_symbol_segment
956 && !S_FORCE_RELOC (fixP->fx_addsy, 0)
957 && !S_FORCE_RELOC (fixP->fx_subsy, 0)
958 && !TC_FORCE_RELOCATION_SUB_SAME (fixP, add_symbol_segment))
960 add_number += S_GET_VALUE (fixP->fx_addsy);
961 add_number -= S_GET_VALUE (fixP->fx_subsy);
962 fixP->fx_offset = add_number;
963 fixP->fx_addsy = NULL;
964 fixP->fx_subsy = NULL;
966 /* See the comment below about 68k weirdness. */
970 else if (sub_symbol_segment == absolute_section
971 && !S_FORCE_RELOC (fixP->fx_subsy, 0)
972 && !TC_FORCE_RELOCATION_SUB_ABS (fixP, add_symbol_segment))
974 add_number -= S_GET_VALUE (fixP->fx_subsy);
975 fixP->fx_offset = add_number;
976 fixP->fx_subsy = NULL;
978 else if (sub_symbol_segment == this_segment
979 && !S_FORCE_RELOC (fixP->fx_subsy, 0)
980 && !TC_FORCE_RELOCATION_SUB_LOCAL (fixP, add_symbol_segment))
982 add_number -= S_GET_VALUE (fixP->fx_subsy);
983 fixP->fx_offset = (add_number + fixP->fx_dot_value
984 + fixP->fx_dot_frag->fr_address);
986 /* Make it pc-relative. If the back-end code has not
987 selected a pc-relative reloc, cancel the adjustment
988 we do later on all pc-relative relocs. */
991 /* Do this for m68k even if it's already described
992 as pc-relative. On the m68k, an operand of
993 "pc@(foo-.-2)" should address "foo" in a
998 add_number += MD_PCREL_FROM_SECTION (fixP, this_segment);
999 fixP->fx_subsy = NULL;
1002 else if (!TC_VALIDATE_FIX_SUB (fixP, add_symbol_segment))
1004 if (!md_register_arithmetic
1005 && (add_symbol_segment == reg_section
1006 || sub_symbol_segment == reg_section))
1007 as_bad_where (fixP->fx_file, fixP->fx_line,
1008 _("register value used as expression"));
1010 as_bad_where (fixP->fx_file, fixP->fx_line,
1011 _("can't resolve `%s' {%s section} - `%s' {%s section}"),
1012 fixP->fx_addsy ? S_GET_NAME (fixP->fx_addsy) : "0",
1013 segment_name (add_symbol_segment),
1014 S_GET_NAME (fixP->fx_subsy),
1015 segment_name (sub_symbol_segment));
1017 else if (sub_symbol_segment != undefined_section
1018 && ! bfd_is_com_section (sub_symbol_segment)
1019 && MD_APPLY_SYM_VALUE (fixP))
1020 add_number -= S_GET_VALUE (fixP->fx_subsy);
1025 if (add_symbol_segment == this_segment
1026 && !S_FORCE_RELOC (fixP->fx_addsy, 0)
1027 && !TC_FORCE_RELOCATION_LOCAL (fixP))
1029 /* This fixup was made when the symbol's segment was
1030 SEG_UNKNOWN, but it is now in the local segment.
1031 So we know how to do the address without relocation. */
1032 add_number += S_GET_VALUE (fixP->fx_addsy);
1033 fixP->fx_offset = add_number;
1035 add_number -= MD_PCREL_FROM_SECTION (fixP, this_segment);
1036 fixP->fx_addsy = NULL;
1039 else if (add_symbol_segment == absolute_section
1040 && !S_FORCE_RELOC (fixP->fx_addsy, 0)
1041 && !TC_FORCE_RELOCATION_ABS (fixP))
1043 add_number += S_GET_VALUE (fixP->fx_addsy);
1044 fixP->fx_offset = add_number;
1045 fixP->fx_addsy = NULL;
1047 else if (add_symbol_segment != undefined_section
1048 && ! bfd_is_com_section (add_symbol_segment)
1049 && MD_APPLY_SYM_VALUE (fixP))
1050 add_number += S_GET_VALUE (fixP->fx_addsy);
1055 add_number -= MD_PCREL_FROM_SECTION (fixP, this_segment);
1056 if (!fixP->fx_done && fixP->fx_addsy == NULL)
1058 /* There was no symbol required by this relocation.
1059 However, BFD doesn't really handle relocations
1060 without symbols well. So fake up a local symbol in
1061 the absolute section. */
1062 fixP->fx_addsy = abs_section_sym;
1067 md_apply_fix (fixP, &add_number, this_segment);
1071 if (fixP->fx_addsy == NULL)
1072 fixP->fx_addsy = abs_section_sym;
1073 symbol_mark_used_in_reloc (fixP->fx_addsy);
1074 if (fixP->fx_subsy != NULL)
1075 symbol_mark_used_in_reloc (fixP->fx_subsy);
1078 if (!fixP->fx_bit_fixP && !fixP->fx_no_overflow && fixP->fx_size != 0)
1080 if (fixP->fx_size < sizeof (valueT))
1085 mask--; /* Set all bits to one. */
1086 mask <<= fixP->fx_size * 8 - (fixP->fx_signed ? 1 : 0);
1087 if ((add_number & mask) != 0 && (add_number & mask) != mask)
1089 char buf[50], buf2[50];
1090 sprint_value (buf, fragP->fr_address + fixP->fx_where);
1091 if (add_number > 1000)
1092 sprint_value (buf2, add_number);
1094 sprintf (buf2, "%ld", (long) add_number);
1095 as_bad_where (fixP->fx_file, fixP->fx_line,
1096 _("value of %s too large for field of %d bytes at %s"),
1097 buf2, fixP->fx_size, buf);
1098 } /* Generic error checking. */
1100 #ifdef WARN_SIGNED_OVERFLOW_WORD
1101 /* Warn if a .word value is too large when treated as a signed
1102 number. We already know it is not too negative. This is to
1103 catch over-large switches generated by gcc on the 68k. */
1104 if (!flag_signed_overflow_ok
1105 && fixP->fx_size == 2
1106 && add_number > 0x7fff)
1107 as_bad_where (fixP->fx_file, fixP->fx_line,
1108 _("signed .word overflow; switch may be too large; %ld at 0x%lx"),
1110 (long) (fragP->fr_address + fixP->fx_where));
1112 } /* Not a bit fix. */
1114 #ifdef TC_VALIDATE_FIX
1115 skip: ATTRIBUTE_UNUSED_LABEL
1119 fprintf (stderr, "result:\n");
1122 } /* For each fixS in this segment. */
1126 fix_segment (bfd *abfd ATTRIBUTE_UNUSED,
1128 void *xxx ATTRIBUTE_UNUSED)
1130 segment_info_type *seginfo = seg_info (sec);
1132 fixup_segment (seginfo->fix_root, sec);
1136 install_reloc (asection *sec, arelent *reloc, fragS *fragp,
1137 char *file, unsigned int line)
1140 bfd_reloc_status_type s;
1143 if (reloc->sym_ptr_ptr != NULL
1144 && (sym = *reloc->sym_ptr_ptr) != NULL
1145 && (sym->flags & BSF_KEEP) == 0
1146 && ((sym->flags & BSF_SECTION_SYM) == 0
1147 || (EMIT_SECTION_SYMBOLS
1148 && !bfd_is_abs_section (sym->section))))
1149 as_bad_where (file, line, _("redefined symbol cannot be used on reloc"));
1151 s = bfd_install_relocation (stdoutput, reloc,
1152 fragp->fr_literal, fragp->fr_address,
1158 case bfd_reloc_overflow:
1159 as_bad_where (file, line, _("relocation overflow"));
1161 case bfd_reloc_outofrange:
1162 as_bad_where (file, line, _("relocation out of range"));
1165 as_fatal (_("%s:%u: bad return from bfd_install_relocation: %x"),
1171 get_frag_for_reloc (fragS *last_frag,
1172 const segment_info_type *seginfo,
1173 const struct reloc_list *r)
1177 for (f = last_frag; f != NULL; f = f->fr_next)
1178 if (f->fr_address <= r->u.b.r.address
1179 && r->u.b.r.address < f->fr_address + f->fr_fix)
1182 for (f = seginfo->frchainP->frch_root; f != NULL; f = f->fr_next)
1183 if (f->fr_address <= r->u.b.r.address
1184 && r->u.b.r.address < f->fr_address + f->fr_fix)
1187 for (f = seginfo->frchainP->frch_root; f != NULL; f = f->fr_next)
1188 if (f->fr_address <= r->u.b.r.address
1189 && r->u.b.r.address <= f->fr_address + f->fr_fix)
1192 as_bad_where (r->file, r->line,
1193 _("reloc not within (fixed part of) section"));
1198 write_relocs (bfd *abfd, asection *sec, void *xxx ATTRIBUTE_UNUSED)
1200 segment_info_type *seginfo = seg_info (sec);
1202 struct reloc_list *my_reloc_list, **rp, *r;
1207 /* If seginfo is NULL, we did not create this section; don't do
1208 anything with it. */
1209 if (seginfo == NULL)
1213 for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next)
1217 #ifdef RELOC_EXPANSION_POSSIBLE
1218 n *= MAX_RELOC_EXPANSION;
1221 /* Extract relocs for this section from reloc_list. */
1223 my_reloc_list = NULL;
1224 while ((r = *rp) != NULL)
1226 if (r->u.b.sec == sec)
1229 r->next = my_reloc_list;
1237 relocs = (arelent **) xcalloc (n, sizeof (arelent *));
1242 for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next)
1247 #ifndef RELOC_EXPANSION_POSSIBLE
1256 fx_size = fixp->fx_size;
1257 slack = TC_FX_SIZE_SLACK (fixp);
1259 fx_size = fx_size > slack ? fx_size - slack : 0;
1260 loc = fixp->fx_where + fx_size;
1261 if (slack >= 0 && loc > fixp->fx_frag->fr_fix)
1262 as_bad_where (fixp->fx_file, fixp->fx_line,
1263 _("internal error: fixup not contained within frag"));
1265 #ifndef RELOC_EXPANSION_POSSIBLE
1266 *reloc = tc_gen_reloc (sec, fixp);
1268 reloc = tc_gen_reloc (sec, fixp);
1273 while (r != NULL && r->u.b.r.address < (*reloc)->address)
1275 fragS *f = get_frag_for_reloc (last_frag, seginfo, r);
1279 relocs[n++] = &r->u.b.r;
1280 install_reloc (sec, &r->u.b.r, f, r->file, r->line);
1284 relocs[n++] = *reloc;
1285 install_reloc (sec, *reloc, fixp->fx_frag,
1286 fixp->fx_file, fixp->fx_line);
1287 #ifndef RELOC_EXPANSION_POSSIBLE
1297 fragS *f = get_frag_for_reloc (last_frag, seginfo, r);
1301 relocs[n++] = &r->u.b.r;
1302 install_reloc (sec, &r->u.b.r, f, r->file, r->line);
1309 unsigned int k, j, nsyms;
1311 sympp = bfd_get_outsymbols (stdoutput);
1312 nsyms = bfd_get_symcount (stdoutput);
1313 for (k = 0; k < n; k++)
1314 if (((*relocs[k]->sym_ptr_ptr)->flags & BSF_SECTION_SYM) == 0)
1316 for (j = 0; j < nsyms; j++)
1317 if (sympp[j] == *relocs[k]->sym_ptr_ptr)
1327 flagword flags = bfd_get_section_flags (abfd, sec);
1329 bfd_set_section_flags (abfd, sec, flags);
1330 bfd_set_reloc (stdoutput, sec, relocs, n);
1333 #ifdef SET_SECTION_RELOCS
1334 SET_SECTION_RELOCS (sec, relocs, n);
1341 fprintf (stderr, "relocs for sec %s\n", sec->name);
1342 for (k = 0; k < n; k++)
1344 arelent *rel = relocs[k];
1345 asymbol *s = *rel->sym_ptr_ptr;
1346 fprintf (stderr, " reloc %2d @%p off %4lx : sym %-10s addend %lx\n",
1347 k, rel, (unsigned long)rel->address, s->name,
1348 (unsigned long)rel->addend);
1355 compress_frag (struct z_stream_s *strm, const char *contents, int in_size,
1356 fragS **last_newf, struct obstack *ob)
1359 int total_out_size = 0;
1360 fragS *f = *last_newf;
1364 /* Call the compression routine repeatedly until it has finished
1365 processing the frag. */
1368 /* Reserve all the space available in the current chunk.
1369 If none is available, start a new frag. */
1370 avail_out = obstack_room (ob);
1373 obstack_finish (ob);
1374 f = frag_alloc (ob);
1375 f->fr_type = rs_fill;
1376 (*last_newf)->fr_next = f;
1378 avail_out = obstack_room (ob);
1381 as_fatal (_("can't extend frag"));
1382 next_out = obstack_next_free (ob);
1383 obstack_blank_fast (ob, avail_out);
1384 out_size = compress_data (strm, &contents, &in_size,
1385 &next_out, &avail_out);
1389 f->fr_fix += out_size;
1390 total_out_size += out_size;
1392 /* Return unused space. */
1394 obstack_blank_fast (ob, -avail_out);
1397 return total_out_size;
1401 compress_debug (bfd *abfd, asection *sec, void *xxx ATTRIBUTE_UNUSED)
1403 segment_info_type *seginfo = seg_info (sec);
1407 struct obstack *ob = &seginfo->frchainP->frch_obstack;
1408 bfd_size_type uncompressed_size = (bfd_size_type) sec->size;
1409 bfd_size_type compressed_size;
1410 const char *section_name;
1411 char *compressed_name;
1413 struct z_stream_s *strm;
1415 flagword flags = bfd_get_section_flags (abfd, sec);
1419 || (flags & (SEC_ALLOC | SEC_HAS_CONTENTS)) == SEC_ALLOC)
1422 section_name = bfd_get_section_name (stdoutput, sec);
1423 if (strncmp (section_name, ".debug_", 7) != 0)
1426 strm = compress_init ();
1430 /* Create a new frag to contain the "ZLIB" header. */
1431 first_newf = frag_alloc (ob);
1432 if (obstack_room (ob) < 12)
1433 first_newf = frag_alloc (ob);
1434 if (obstack_room (ob) < 12)
1435 as_fatal (_("can't extend frag %u chars"), 12);
1436 last_newf = first_newf;
1437 obstack_blank_fast (ob, 12);
1438 last_newf->fr_type = rs_fill;
1439 last_newf->fr_fix = 12;
1440 header = last_newf->fr_literal;
1441 memcpy (header, "ZLIB", 4);
1442 header[11] = uncompressed_size; uncompressed_size >>= 8;
1443 header[10] = uncompressed_size; uncompressed_size >>= 8;
1444 header[9] = uncompressed_size; uncompressed_size >>= 8;
1445 header[8] = uncompressed_size; uncompressed_size >>= 8;
1446 header[7] = uncompressed_size; uncompressed_size >>= 8;
1447 header[6] = uncompressed_size; uncompressed_size >>= 8;
1448 header[5] = uncompressed_size; uncompressed_size >>= 8;
1449 header[4] = uncompressed_size;
1450 compressed_size = 12;
1452 /* Stream the frags through the compression engine, adding new frags
1453 as necessary to accomodate the compressed output. */
1454 for (f = seginfo->frchainP->frch_root;
1463 gas_assert (f->fr_type == rs_fill);
1466 out_size = compress_frag (strm, f->fr_literal, f->fr_fix,
1470 compressed_size += out_size;
1472 fill_literal = f->fr_literal + f->fr_fix;
1473 fill_size = f->fr_var;
1474 count = f->fr_offset;
1475 gas_assert (count >= 0);
1476 if (fill_size && count)
1480 out_size = compress_frag (strm, fill_literal, (int) fill_size,
1484 compressed_size += out_size;
1489 /* Flush the compression state. */
1496 /* Reserve all the space available in the current chunk.
1497 If none is available, start a new frag. */
1498 avail_out = obstack_room (ob);
1503 obstack_finish (ob);
1504 newf = frag_alloc (ob);
1505 newf->fr_type = rs_fill;
1506 last_newf->fr_next = newf;
1508 avail_out = obstack_room (ob);
1511 as_fatal (_("can't extend frag"));
1512 next_out = obstack_next_free (ob);
1513 obstack_blank_fast (ob, avail_out);
1514 x = compress_finish (strm, &next_out, &avail_out, &out_size);
1518 last_newf->fr_fix += out_size;
1519 compressed_size += out_size;
1521 /* Return unused space. */
1523 obstack_blank_fast (ob, -avail_out);
1529 /* Replace the uncompressed frag list with the compressed frag list. */
1530 seginfo->frchainP->frch_root = first_newf;
1531 seginfo->frchainP->frch_last = last_newf;
1533 /* Update the section size and its name. */
1534 x = bfd_set_section_size (abfd, sec, compressed_size);
1536 compressed_name = (char *) xmalloc (strlen (section_name) + 2);
1537 compressed_name[0] = '.';
1538 compressed_name[1] = 'z';
1539 strcpy (compressed_name + 2, section_name + 1);
1540 bfd_section_name (stdoutput, sec) = compressed_name;
1544 write_contents (bfd *abfd ATTRIBUTE_UNUSED,
1546 void *xxx ATTRIBUTE_UNUSED)
1548 segment_info_type *seginfo = seg_info (sec);
1549 addressT offset = 0;
1552 /* Write out the frags. */
1554 || !(bfd_get_section_flags (abfd, sec) & SEC_HAS_CONTENTS))
1557 for (f = seginfo->frchainP->frch_root;
1566 gas_assert (f->fr_type == rs_fill);
1569 x = bfd_set_section_contents (stdoutput, sec,
1570 f->fr_literal, (file_ptr) offset,
1571 (bfd_size_type) f->fr_fix);
1573 as_fatal (_("can't write %s: %s"), stdoutput->filename,
1574 bfd_errmsg (bfd_get_error ()));
1575 offset += f->fr_fix;
1577 fill_literal = f->fr_literal + f->fr_fix;
1578 fill_size = f->fr_var;
1579 count = f->fr_offset;
1580 gas_assert (count >= 0);
1581 if (fill_size && count)
1584 if (fill_size > sizeof (buf))
1586 /* Do it the old way. Can this ever happen? */
1589 x = bfd_set_section_contents (stdoutput, sec,
1592 (bfd_size_type) fill_size);
1594 as_fatal (_("can't write %s: %s"), stdoutput->filename,
1595 bfd_errmsg (bfd_get_error ()));
1596 offset += fill_size;
1601 /* Build a buffer full of fill objects and output it as
1602 often as necessary. This saves on the overhead of
1603 potentially lots of bfd_set_section_contents calls. */
1607 n_per_buf = sizeof (buf);
1608 memset (buf, *fill_literal, n_per_buf);
1613 n_per_buf = sizeof (buf) / fill_size;
1614 for (i = n_per_buf, bufp = buf; i; i--, bufp += fill_size)
1615 memcpy (bufp, fill_literal, fill_size);
1617 for (; count > 0; count -= n_per_buf)
1619 n_per_buf = n_per_buf > count ? count : n_per_buf;
1620 x = bfd_set_section_contents
1621 (stdoutput, sec, buf, (file_ptr) offset,
1622 (bfd_size_type) n_per_buf * fill_size);
1624 as_fatal (_("cannot write to output file '%s': %s"),
1625 stdoutput->filename,
1626 bfd_errmsg (bfd_get_error ()));
1627 offset += n_per_buf * fill_size;
1635 merge_data_into_text (void)
1637 seg_info (text_section)->frchainP->frch_last->fr_next =
1638 seg_info (data_section)->frchainP->frch_root;
1639 seg_info (text_section)->frchainP->frch_last =
1640 seg_info (data_section)->frchainP->frch_last;
1641 seg_info (data_section)->frchainP = 0;
1652 /* Count symbols. We can't rely on a count made by the loop in
1653 write_object_file, because *_frob_file may add a new symbol or
1656 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
1662 bfd_size_type amt = (bfd_size_type) nsyms * sizeof (asymbol *);
1664 asympp = (asymbol **) bfd_alloc (stdoutput, amt);
1665 symp = symbol_rootP;
1666 for (i = 0; i < nsyms; i++, symp = symbol_next (symp))
1668 asympp[i] = symbol_get_bfdsym (symp);
1669 if (asympp[i]->flags != BSF_SECTION_SYM
1670 || !(bfd_is_const_section (asympp[i]->section)
1671 && asympp[i]->section->symbol == asympp[i]))
1672 asympp[i]->flags |= BSF_KEEP;
1673 symbol_mark_written (symp);
1678 result = bfd_set_symtab (stdoutput, asympp, nsyms);
1679 gas_assert (result);
1680 symbol_table_frozen = 1;
1683 /* Finish the subsegments. After every sub-segment, we fake an
1684 ".align ...". This conforms to BSD4.2 brane-damage. We then fake
1685 ".fill 0" because that is the kind of frag that requires least
1686 thought. ".align" frags like to have a following frag since that
1687 makes calculating their intended length trivial. */
1689 #ifndef SUB_SEGMENT_ALIGN
1691 /* The last subsegment gets an alignment corresponding to the alignment
1692 of the section. This allows proper nop-filling at the end of
1693 code-bearing sections. */
1694 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) \
1695 (!(FRCHAIN)->frch_next ? get_recorded_alignment (SEG) : 0)
1697 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) 0
1702 subsegs_finish_section (asection *s)
1704 struct frchain *frchainP;
1705 segment_info_type *seginfo = seg_info (s);
1709 for (frchainP = seginfo->frchainP;
1711 frchainP = frchainP->frch_next)
1715 subseg_set (s, frchainP->frch_subseg);
1717 /* This now gets called even if we had errors. In that case,
1718 any alignment is meaningless, and, moreover, will look weird
1719 if we are generating a listing. */
1722 alignment = SUB_SEGMENT_ALIGN (now_seg, frchainP);
1723 if ((bfd_get_section_flags (now_seg->owner, now_seg) & SEC_MERGE)
1724 && now_seg->entsize)
1726 unsigned int entsize = now_seg->entsize;
1729 while ((entsize & 1) == 0)
1735 if (entalign > alignment)
1736 alignment = entalign;
1740 if (subseg_text_p (now_seg))
1741 frag_align_code (alignment, 0);
1743 frag_align (alignment, 0, 0);
1745 /* frag_align will have left a new frag.
1746 Use this last frag for an empty ".fill".
1748 For this segment ...
1749 Create a last frag. Do not leave a "being filled in frag". */
1750 frag_wane (frag_now);
1751 frag_now->fr_fix = 0;
1752 know (frag_now->fr_next == NULL);
1757 subsegs_finish (void)
1761 for (s = stdoutput->sections; s; s = s->next)
1762 subsegs_finish_section (s);
1767 create_obj_attrs_section (void)
1774 size = bfd_elf_obj_attr_size (stdoutput);
1777 name = get_elf_backend_data (stdoutput)->obj_attrs_section;
1779 name = ".gnu.attributes";
1780 s = subseg_new (name, 0);
1781 elf_section_type (s)
1782 = get_elf_backend_data (stdoutput)->obj_attrs_section_type;
1783 bfd_set_section_flags (stdoutput, s, SEC_READONLY | SEC_DATA);
1785 p = frag_more (size);
1786 bfd_elf_set_obj_attr_contents (stdoutput, (bfd_byte *)p, size);
1788 subsegs_finish_section (s);
1789 relax_segment (seg_info (s)->frchainP->frch_root, s, 0);
1790 size_seg (stdoutput, s, NULL);
1795 /* Write the object file. */
1798 write_object_file (void)
1800 struct relax_seg_info rsi;
1801 #ifndef WORKING_DOT_WORD
1802 fragS *fragP; /* Track along all frags. */
1807 #ifdef md_pre_output_hook
1811 #ifdef md_pre_relax_hook
1815 /* From now on, we don't care about sub-segments. Build one frag chain
1816 for each segment. Linked thru fr_next. */
1818 /* Remove the sections created by gas for its own purposes. */
1822 bfd_section_list_remove (stdoutput, reg_section);
1823 bfd_section_list_remove (stdoutput, expr_section);
1824 stdoutput->section_count -= 2;
1826 bfd_map_over_sections (stdoutput, renumber_sections, &i);
1829 bfd_map_over_sections (stdoutput, chain_frchains_together, (char *) 0);
1831 /* We have two segments. If user gave -R flag, then we must put the
1832 data frags into the text segment. Do this before relaxing so
1833 we know to take advantage of -R and make shorter addresses. */
1834 if (flag_readonly_data_in_text)
1836 merge_data_into_text ();
1842 #ifndef WORKING_DOT_WORD
1843 /* We need to reset the markers in the broken word list and
1844 associated frags between calls to relax_segment (via
1845 relax_seg). Since the broken word list is global, we do it
1846 once per round, rather than locally in relax_segment for each
1848 struct broken_word *brokp;
1850 for (brokp = broken_words;
1851 brokp != (struct broken_word *) NULL;
1852 brokp = brokp->next_broken_word)
1856 if (brokp->dispfrag != (fragS *) NULL
1857 && brokp->dispfrag->fr_type == rs_broken_word)
1858 brokp->dispfrag->fr_subtype = 0;
1863 bfd_map_over_sections (stdoutput, relax_seg, &rsi);
1869 /* Note - Most ports will use the default value of
1870 TC_FINALIZE_SYMS_BEFORE_SIZE_SEG, which 1. This will force
1871 local symbols to be resolved, removing their frag information.
1872 Some ports however, will not have finished relaxing all of
1873 their frags and will still need the local symbol frag
1874 information. These ports can set
1875 TC_FINALIZE_SYMS_BEFORE_SIZE_SEG to 0. */
1876 finalize_syms = TC_FINALIZE_SYMS_BEFORE_SIZE_SEG;
1878 bfd_map_over_sections (stdoutput, size_seg, (char *) 0);
1880 /* Relaxation has completed. Freeze all syms. */
1883 #ifdef md_post_relax_hook
1889 create_obj_attrs_section ();
1892 #ifndef WORKING_DOT_WORD
1894 struct broken_word *lie;
1895 struct broken_word **prevP;
1897 prevP = &broken_words;
1898 for (lie = broken_words; lie; lie = lie->next_broken_word)
1903 subseg_change (lie->seg, lie->subseg);
1904 exp.X_op = O_subtract;
1905 exp.X_add_symbol = lie->add;
1906 exp.X_op_symbol = lie->sub;
1907 exp.X_add_number = lie->addnum;
1908 #ifdef TC_CONS_FIX_NEW
1909 TC_CONS_FIX_NEW (lie->frag,
1910 lie->word_goes_here - lie->frag->fr_literal,
1911 2, &exp, TC_PARSE_CONS_RETURN_NONE);
1913 fix_new_exp (lie->frag,
1914 lie->word_goes_here - lie->frag->fr_literal,
1915 2, &exp, 0, BFD_RELOC_16);
1917 *prevP = lie->next_broken_word;
1920 prevP = &(lie->next_broken_word);
1922 for (lie = broken_words; lie;)
1924 struct broken_word *untruth;
1926 addressT table_addr;
1927 addressT from_addr, to_addr;
1930 subseg_change (lie->seg, lie->subseg);
1931 fragP = lie->dispfrag;
1933 /* Find out how many broken_words go here. */
1936 untruth && untruth->dispfrag == fragP;
1937 untruth = untruth->next_broken_word)
1938 if (untruth->added == 1)
1941 table_ptr = lie->dispfrag->fr_opcode;
1942 table_addr = (lie->dispfrag->fr_address
1943 + (table_ptr - lie->dispfrag->fr_literal));
1944 /* Create the jump around the long jumps. This is a short
1945 jump from table_ptr+0 to table_ptr+n*long_jump_size. */
1946 from_addr = table_addr;
1947 to_addr = table_addr + md_short_jump_size + n * md_long_jump_size;
1948 md_create_short_jump (table_ptr, from_addr, to_addr, lie->dispfrag,
1950 table_ptr += md_short_jump_size;
1951 table_addr += md_short_jump_size;
1954 lie && lie->dispfrag == fragP;
1955 m++, lie = lie->next_broken_word)
1957 if (lie->added == 2)
1959 /* Patch the jump table. */
1960 for (untruth = (struct broken_word *) (fragP->fr_symbol);
1961 untruth && untruth->dispfrag == fragP;
1962 untruth = untruth->next_broken_word)
1964 if (untruth->use_jump == lie)
1966 /* This is the offset from ??? to table_ptr+0.
1967 The target is the same for all users of this
1968 md_long_jump, but the "sub" bases (and hence the
1969 offsets) may be different. */
1970 addressT to_word = table_addr - S_GET_VALUE (untruth->sub);
1971 #ifdef TC_CHECK_ADJUSTED_BROKEN_DOT_WORD
1972 TC_CHECK_ADJUSTED_BROKEN_DOT_WORD (to_word, untruth);
1974 md_number_to_chars (untruth->word_goes_here, to_word, 2);
1978 /* Install the long jump. */
1979 /* This is a long jump from table_ptr+0 to the final target. */
1980 from_addr = table_addr;
1981 to_addr = S_GET_VALUE (lie->add) + lie->addnum;
1982 md_create_long_jump (table_ptr, from_addr, to_addr, lie->dispfrag,
1984 table_ptr += md_long_jump_size;
1985 table_addr += md_long_jump_size;
1989 #endif /* not WORKING_DOT_WORD */
1991 /* Resolve symbol values. This needs to be done before processing
1997 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
1998 resolve_symbol_value (symp);
2000 resolve_local_symbol_values ();
2001 resolve_reloc_expr_symbols ();
2005 #ifdef tc_frob_file_before_adjust
2006 tc_frob_file_before_adjust ();
2008 #ifdef obj_frob_file_before_adjust
2009 obj_frob_file_before_adjust ();
2012 bfd_map_over_sections (stdoutput, adjust_reloc_syms, (char *) 0);
2014 #ifdef tc_frob_file_before_fix
2015 tc_frob_file_before_fix ();
2017 #ifdef obj_frob_file_before_fix
2018 obj_frob_file_before_fix ();
2021 bfd_map_over_sections (stdoutput, fix_segment, (char *) 0);
2023 /* Set up symbol table, and write it out. */
2027 bfd_boolean skip_next_symbol = FALSE;
2029 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
2034 if (skip_next_symbol)
2036 /* Don't do anything besides moving the value of the
2037 symbol from the GAS value-field to the BFD value-field. */
2038 symbol_get_bfdsym (symp)->value = S_GET_VALUE (symp);
2039 skip_next_symbol = FALSE;
2043 if (symbol_mri_common_p (symp))
2045 if (S_IS_EXTERNAL (symp))
2046 as_bad (_("%s: global symbols not supported in common sections"),
2048 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
2052 name = S_GET_NAME (symp);
2056 decode_local_label_name ((char *) S_GET_NAME (symp));
2057 /* They only differ if `name' is a fb or dollar local
2059 if (name2 != name && ! S_IS_DEFINED (symp))
2060 as_bad (_("local label `%s' is not defined"), name2);
2063 /* Do it again, because adjust_reloc_syms might introduce
2064 more symbols. They'll probably only be section symbols,
2065 but they'll still need to have the values computed. */
2066 resolve_symbol_value (symp);
2068 /* Skip symbols which were equated to undefined or common
2070 if (symbol_equated_reloc_p (symp)
2071 || S_IS_WEAKREFR (symp))
2073 const char *sname = S_GET_NAME (symp);
2075 if (S_IS_COMMON (symp)
2076 && !TC_FAKE_LABEL (sname)
2077 && !S_IS_WEAKREFR (symp)
2078 && (!S_IS_EXTERNAL (symp) || S_IS_LOCAL (symp)))
2080 expressionS *e = symbol_get_value_expression (symp);
2082 as_bad (_("Local symbol `%s' can't be equated to common symbol `%s'"),
2083 sname, S_GET_NAME (e->X_add_symbol));
2085 if (S_GET_SEGMENT (symp) == reg_section)
2087 /* Report error only if we know the symbol name. */
2088 if (S_GET_NAME (symp) != reg_section->name)
2089 as_bad (_("can't make global register symbol `%s'"),
2092 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
2096 #ifdef obj_frob_symbol
2097 obj_frob_symbol (symp, punt);
2099 #ifdef tc_frob_symbol
2100 if (! punt || symbol_used_in_reloc_p (symp))
2101 tc_frob_symbol (symp, punt);
2104 /* If we don't want to keep this symbol, splice it out of
2105 the chain now. If EMIT_SECTION_SYMBOLS is 0, we never
2106 want section symbols. Otherwise, we skip local symbols
2107 and symbols that the frob_symbol macros told us to punt,
2108 but we keep such symbols if they are used in relocs. */
2109 if (symp == abs_section_sym
2110 || (! EMIT_SECTION_SYMBOLS
2111 && symbol_section_p (symp))
2112 /* Note that S_IS_EXTERNAL and S_IS_LOCAL are not always
2113 opposites. Sometimes the former checks flags and the
2114 latter examines the name... */
2115 || (!S_IS_EXTERNAL (symp)
2116 && (punt || S_IS_LOCAL (symp) ||
2117 (S_IS_WEAKREFD (symp) && ! symbol_used_p (symp)))
2118 && ! symbol_used_in_reloc_p (symp)))
2120 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
2122 /* After symbol_remove, symbol_next(symp) still returns
2123 the one that came after it in the chain. So we don't
2124 need to do any extra cleanup work here. */
2128 /* Make sure we really got a value for the symbol. */
2129 if (! symbol_resolved_p (symp))
2131 as_bad (_("can't resolve value for symbol `%s'"),
2133 symbol_mark_resolved (symp);
2136 /* Set the value into the BFD symbol. Up til now the value
2137 has only been kept in the gas symbolS struct. */
2138 symbol_get_bfdsym (symp)->value = S_GET_VALUE (symp);
2140 /* A warning construct is a warning symbol followed by the
2141 symbol warned about. Don't let anything object-format or
2142 target-specific muck with it; it's ready for output. */
2143 if (symbol_get_bfdsym (symp)->flags & BSF_WARNING)
2144 skip_next_symbol = TRUE;
2150 /* Now do any format-specific adjustments to the symbol table, such
2151 as adding file symbols. */
2152 #ifdef tc_adjust_symtab
2153 tc_adjust_symtab ();
2155 #ifdef obj_adjust_symtab
2156 obj_adjust_symtab ();
2159 /* Stop if there is an error. */
2163 /* Now that all the sizes are known, and contents correct, we can
2164 start writing to the file. */
2167 /* If *_frob_file changes the symbol value at this point, it is
2168 responsible for moving the changed value into symp->bsym->value
2169 as well. Hopefully all symbol value changing can be done in
2174 #ifdef obj_frob_file
2177 #ifdef obj_coff_generate_pdata
2178 obj_coff_generate_pdata ();
2180 bfd_map_over_sections (stdoutput, write_relocs, (char *) 0);
2182 #ifdef tc_frob_file_after_relocs
2183 tc_frob_file_after_relocs ();
2185 #ifdef obj_frob_file_after_relocs
2186 obj_frob_file_after_relocs ();
2189 /* Once all relocations have been written, we can compress the
2190 contents of the debug sections. This needs to be done before
2191 we start writing any sections, because it will affect the file
2192 layout, which is fixed once we start writing contents. */
2193 if (flag_compress_debug)
2194 bfd_map_over_sections (stdoutput, compress_debug, (char *) 0);
2196 bfd_map_over_sections (stdoutput, write_contents, (char *) 0);
2199 #ifdef TC_GENERIC_RELAX_TABLE
2200 /* Relax a fragment by scanning TC_GENERIC_RELAX_TABLE. */
2203 relax_frag (segT segment, fragS *fragP, long stretch)
2205 const relax_typeS *this_type;
2206 const relax_typeS *start_type;
2207 relax_substateT next_state;
2208 relax_substateT this_state;
2214 const relax_typeS *table;
2216 target = fragP->fr_offset;
2217 address = fragP->fr_address;
2218 table = TC_GENERIC_RELAX_TABLE;
2219 this_state = fragP->fr_subtype;
2220 start_type = this_type = table + this_state;
2221 symbolP = fragP->fr_symbol;
2227 sym_frag = symbol_get_frag (symbolP);
2229 #ifndef DIFF_EXPR_OK
2230 know (sym_frag != NULL);
2232 know (S_GET_SEGMENT (symbolP) != absolute_section
2233 || sym_frag == &zero_address_frag);
2234 target += S_GET_VALUE (symbolP);
2236 /* If SYM_FRAG has yet to be reached on this pass, assume it
2237 will move by STRETCH just as we did, unless there is an
2238 alignment frag between here and SYM_FRAG. An alignment may
2239 well absorb any STRETCH, and we don't want to choose a larger
2240 branch insn by overestimating the needed reach of this
2241 branch. It isn't critical to calculate TARGET exactly; We
2242 know we'll be doing another pass if STRETCH is non-zero. */
2245 && sym_frag->relax_marker != fragP->relax_marker
2246 && S_GET_SEGMENT (symbolP) == segment)
2249 || sym_frag->region == fragP->region)
2251 /* If we get here we know we have a forward branch. This
2252 relax pass may have stretched previous instructions so
2253 far that omitting STRETCH would make the branch
2254 negative. Don't allow this in case the negative reach is
2255 large enough to require a larger branch instruction. */
2256 else if (target < address)
2257 target = fragP->fr_next->fr_address + stretch;
2261 aim = target - address - fragP->fr_fix;
2262 #ifdef TC_PCREL_ADJUST
2263 /* Currently only the ns32k family needs this. */
2264 aim += TC_PCREL_ADJUST (fragP);
2267 #ifdef md_prepare_relax_scan
2268 /* Formerly called M68K_AIM_KLUDGE. */
2269 md_prepare_relax_scan (fragP, address, aim, this_state, this_type);
2274 /* Look backwards. */
2275 for (next_state = this_type->rlx_more; next_state;)
2276 if (aim >= this_type->rlx_backward)
2280 /* Grow to next state. */
2281 this_state = next_state;
2282 this_type = table + this_state;
2283 next_state = this_type->rlx_more;
2288 /* Look forwards. */
2289 for (next_state = this_type->rlx_more; next_state;)
2290 if (aim <= this_type->rlx_forward)
2294 /* Grow to next state. */
2295 this_state = next_state;
2296 this_type = table + this_state;
2297 next_state = this_type->rlx_more;
2301 growth = this_type->rlx_length - start_type->rlx_length;
2303 fragP->fr_subtype = this_state;
2307 #endif /* defined (TC_GENERIC_RELAX_TABLE) */
2309 /* Relax_align. Advance location counter to next address that has 'alignment'
2310 lowest order bits all 0s, return size of adjustment made. */
2311 static relax_addressT
2312 relax_align (relax_addressT address, /* Address now. */
2313 int alignment /* Alignment (binary). */)
2315 relax_addressT mask;
2316 relax_addressT new_address;
2318 mask = ~((relax_addressT) ~0 << alignment);
2319 new_address = (address + mask) & (~mask);
2320 #ifdef LINKER_RELAXING_SHRINKS_ONLY
2322 /* We must provide lots of padding, so the linker can discard it
2323 when needed. The linker will not add extra space, ever. */
2324 new_address += (1 << alignment);
2326 return (new_address - address);
2329 /* Now we have a segment, not a crowd of sub-segments, we can make
2334 After this, all frags in this segment have addresses that are correct
2335 within the segment. Since segments live in different file addresses,
2336 these frag addresses may not be the same as final object-file
2340 relax_segment (struct frag *segment_frag_root, segT segment, int pass)
2342 unsigned long frag_count;
2344 relax_addressT address;
2348 /* In case md_estimate_size_before_relax() wants to make fixSs. */
2349 subseg_change (segment, 0);
2351 /* For each frag in segment: count and store (a 1st guess of)
2355 for (frag_count = 0, fragP = segment_frag_root;
2357 fragP = fragP->fr_next, frag_count ++)
2359 fragP->region = region;
2360 fragP->relax_marker = 0;
2361 fragP->fr_address = address;
2362 address += fragP->fr_fix;
2364 switch (fragP->fr_type)
2367 address += fragP->fr_offset * fragP->fr_var;
2374 addressT offset = relax_align (address, (int) fragP->fr_offset);
2376 if (fragP->fr_subtype != 0 && offset > fragP->fr_subtype)
2379 if (offset % fragP->fr_var != 0)
2381 as_bad_where (fragP->fr_file, fragP->fr_line,
2382 _("alignment padding (%lu bytes) not a multiple of %ld"),
2383 (unsigned long) offset, (long) fragP->fr_var);
2384 offset -= (offset % fragP->fr_var);
2393 /* Assume .org is nugatory. It will grow with 1st relax. */
2400 case rs_machine_dependent:
2401 /* If fr_symbol is an expression, this call to
2402 resolve_symbol_value sets up the correct segment, which will
2403 likely be needed in md_estimate_size_before_relax. */
2404 if (fragP->fr_symbol)
2405 resolve_symbol_value (fragP->fr_symbol);
2407 address += md_estimate_size_before_relax (fragP, segment);
2410 #ifndef WORKING_DOT_WORD
2411 /* Broken words don't concern us yet. */
2412 case rs_broken_word:
2417 /* Initial guess is always 1; doing otherwise can result in
2418 stable solutions that are larger than the minimum. */
2419 address += fragP->fr_offset = 1;
2423 address += eh_frame_estimate_size_before_relax (fragP);
2427 address += dwarf2dbg_estimate_size_before_relax (fragP);
2431 BAD_CASE (fragP->fr_type);
2438 unsigned long max_iterations;
2440 /* Cumulative address adjustment. */
2443 /* Have we made any adjustment this pass? We can't just test
2444 stretch because one piece of code may have grown and another
2448 /* Most horrible, but gcc may give us some exception data that
2449 is impossible to assemble, of the form
2453 .uleb128 end - start
2459 If the leb128 is two bytes in size, then end-start is 128*128,
2460 which requires a three byte leb128. If the leb128 is three
2461 bytes in size, then end-start is 128*128-1, which requires a
2462 two byte leb128. We work around this dilemma by inserting
2463 an extra 4 bytes of alignment just after the .align. This
2464 works because the data after the align is accessed relative to
2467 This counter is used in a tiny state machine to detect
2468 whether a leb128 followed by an align is impossible to
2470 int rs_leb128_fudge = 0;
2472 /* We want to prevent going into an infinite loop where one frag grows
2473 depending upon the location of a symbol which is in turn moved by
2474 the growing frag. eg:
2480 So we dictate that this algorithm can be at most O2. */
2481 max_iterations = frag_count * frag_count;
2482 /* Check for overflow. */
2483 if (max_iterations < frag_count)
2484 max_iterations = frag_count;
2492 for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next)
2495 addressT was_address;
2499 fragP->relax_marker ^= 1;
2500 was_address = fragP->fr_address;
2501 address = fragP->fr_address += stretch;
2502 symbolP = fragP->fr_symbol;
2503 offset = fragP->fr_offset;
2505 switch (fragP->fr_type)
2507 case rs_fill: /* .fill never relaxes. */
2511 #ifndef WORKING_DOT_WORD
2512 /* JF: This is RMS's idea. I do *NOT* want to be blamed
2513 for it I do not want to write it. I do not want to have
2514 anything to do with it. This is not the proper way to
2515 implement this misfeature. */
2516 case rs_broken_word:
2518 struct broken_word *lie;
2519 struct broken_word *untruth;
2521 /* Yes this is ugly (storing the broken_word pointer
2522 in the symbol slot). Still, this whole chunk of
2523 code is ugly, and I don't feel like doing anything
2524 about it. Think of it as stubbornness in action. */
2526 for (lie = (struct broken_word *) (fragP->fr_symbol);
2527 lie && lie->dispfrag == fragP;
2528 lie = lie->next_broken_word)
2534 offset = (S_GET_VALUE (lie->add)
2536 - S_GET_VALUE (lie->sub));
2537 if (offset <= -32768 || offset >= 32767)
2539 if (flag_warn_displacement)
2542 sprint_value (buf, (addressT) lie->addnum);
2543 as_warn_where (fragP->fr_file, fragP->fr_line,
2544 _(".word %s-%s+%s didn't fit"),
2545 S_GET_NAME (lie->add),
2546 S_GET_NAME (lie->sub),
2549 if (fragP->fr_subtype == 0)
2551 fragP->fr_subtype++;
2552 growth += md_short_jump_size;
2555 /* Redirect *all* words of this table with the same
2556 target, lest we have to handle the case where the
2557 same target but with a offset that fits on this
2558 round overflows at the next relaxation round. */
2559 for (untruth = (struct broken_word *) (fragP->fr_symbol);
2560 untruth && untruth->dispfrag == lie->dispfrag;
2561 untruth = untruth->next_broken_word)
2562 if ((symbol_get_frag (untruth->add)
2563 == symbol_get_frag (lie->add))
2564 && (S_GET_VALUE (untruth->add)
2565 == S_GET_VALUE (lie->add)))
2568 untruth->use_jump = lie;
2572 growth += md_long_jump_size;
2577 } /* case rs_broken_word */
2583 addressT oldoff, newoff;
2585 oldoff = relax_align (was_address + fragP->fr_fix,
2587 newoff = relax_align (address + fragP->fr_fix,
2590 if (fragP->fr_subtype != 0)
2592 if (oldoff > fragP->fr_subtype)
2594 if (newoff > fragP->fr_subtype)
2598 growth = newoff - oldoff;
2600 /* If this align happens to follow a leb128 and
2601 we have determined that the leb128 is bouncing
2602 in size, then break the cycle by inserting an
2605 && (rs_leb128_fudge & 16) != 0
2606 && (rs_leb128_fudge & 15) >= 2)
2608 segment_info_type *seginfo = seg_info (segment);
2609 struct obstack *ob = &seginfo->frchainP->frch_obstack;
2612 newf = frag_alloc (ob);
2613 obstack_blank_fast (ob, fragP->fr_var);
2614 obstack_finish (ob);
2615 memcpy (newf, fragP, SIZEOF_STRUCT_FRAG);
2616 memcpy (newf->fr_literal,
2617 fragP->fr_literal + fragP->fr_fix,
2619 newf->fr_type = rs_fill;
2620 newf->fr_address = address + fragP->fr_fix + newoff;
2622 newf->fr_offset = (((offsetT) 1 << fragP->fr_offset)
2624 if (newf->fr_offset * newf->fr_var
2625 != (offsetT) 1 << fragP->fr_offset)
2627 newf->fr_offset = (offsetT) 1 << fragP->fr_offset;
2630 /* Include size of new frag in GROWTH. */
2631 growth += newf->fr_offset * newf->fr_var;
2632 /* Adjust the new frag address for the amount
2633 we'll add when we process the new frag. */
2634 newf->fr_address -= stretch + growth;
2635 newf->relax_marker ^= 1;
2636 fragP->fr_next = newf;
2638 as_warn (_("padding added"));
2646 addressT target = offset;
2651 /* Convert from an actual address to an octet offset
2652 into the section. Here it is assumed that the
2653 section's VMA is zero, and can omit subtracting it
2654 from the symbol's value to get the address offset. */
2655 know (S_GET_SEGMENT (symbolP)->vma == 0);
2656 target += S_GET_VALUE (symbolP) * OCTETS_PER_BYTE;
2659 know (fragP->fr_next);
2660 after = fragP->fr_next->fr_address + stretch;
2661 growth = target - after;
2666 /* Don't error on first few frag relax passes.
2667 The symbol might be an expression involving
2668 symbol values from other sections. If those
2669 sections have not yet been processed their
2670 frags will all have zero addresses, so we
2671 will calculate incorrect values for them. The
2672 number of passes we allow before giving an
2673 error is somewhat arbitrary. It should be at
2674 least one, with larger values requiring
2675 increasingly contrived dependencies between
2676 frags to trigger a false error. */
2679 /* Force another pass. */
2684 /* Growth may be negative, but variable part of frag
2685 cannot have fewer than 0 chars. That is, we can't
2687 as_bad_where (fragP->fr_file, fragP->fr_line,
2688 _("attempt to move .org backwards"));
2690 /* We've issued an error message. Change the
2691 frag to avoid cascading errors. */
2692 fragP->fr_type = rs_align;
2693 fragP->fr_subtype = 0;
2694 fragP->fr_offset = 0;
2695 fragP->fr_fix = after - address;
2706 amount = S_GET_VALUE (symbolP);
2707 if (S_GET_SEGMENT (symbolP) != absolute_section
2708 || S_IS_COMMON (symbolP)
2709 || ! S_IS_DEFINED (symbolP))
2711 as_bad_where (fragP->fr_file, fragP->fr_line,
2712 _(".space specifies non-absolute value"));
2713 /* Prevent repeat of this error message. */
2714 fragP->fr_symbol = 0;
2716 else if (amount < 0)
2718 /* Don't error on first few frag relax passes.
2719 See rs_org comment for a longer explanation. */
2726 as_warn_where (fragP->fr_file, fragP->fr_line,
2727 _(".space or .fill with negative value, ignored"));
2728 fragP->fr_symbol = 0;
2731 growth = (was_address + fragP->fr_fix + amount
2732 - fragP->fr_next->fr_address);
2736 case rs_machine_dependent:
2737 #ifdef md_relax_frag
2738 growth = md_relax_frag (segment, fragP, stretch);
2740 #ifdef TC_GENERIC_RELAX_TABLE
2741 /* The default way to relax a frag is to look through
2742 TC_GENERIC_RELAX_TABLE. */
2743 growth = relax_frag (segment, fragP, stretch);
2744 #endif /* TC_GENERIC_RELAX_TABLE */
2753 value = resolve_symbol_value (fragP->fr_symbol);
2754 size = sizeof_leb128 (value, fragP->fr_subtype);
2755 growth = size - fragP->fr_offset;
2756 fragP->fr_offset = size;
2761 growth = eh_frame_relax_frag (fragP);
2765 growth = dwarf2dbg_relax_frag (fragP);
2769 BAD_CASE (fragP->fr_type);
2776 if (fragP->fr_type == rs_leb128)
2777 rs_leb128_fudge += 16;
2778 else if (fragP->fr_type == rs_align
2779 && (rs_leb128_fudge & 16) != 0
2781 rs_leb128_fudge += 16;
2783 rs_leb128_fudge = 0;
2788 && (rs_leb128_fudge & 16) == 0
2789 && (rs_leb128_fudge & -16) != 0)
2790 rs_leb128_fudge += 1;
2792 rs_leb128_fudge = 0;
2794 /* Until nothing further to relax. */
2795 while (stretched && -- max_iterations);
2798 as_fatal (_("Infinite loop encountered whilst attempting to compute the addresses of symbols in section %s"),
2799 segment_name (segment));
2802 for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next)
2803 if (fragP->last_fr_address != fragP->fr_address)
2805 fragP->last_fr_address = fragP->fr_address;
2812 number_to_chars_bigendian (char *buf, valueT val, int n)
2818 buf[n] = val & 0xff;
2824 number_to_chars_littleendian (char *buf, valueT val, int n)
2830 *buf++ = val & 0xff;
2836 write_print_statistics (FILE *file)
2838 fprintf (file, "fixups: %d\n", n_fixups);
2841 /* For debugging. */
2842 extern int indent_level;
2845 print_fixup (fixS *fixp)
2848 fprintf (stderr, "fix ");
2849 fprintf_vma (stderr, (bfd_vma)((bfd_hostptr_t) fixp));
2850 fprintf (stderr, " %s:%d",fixp->fx_file, fixp->fx_line);
2852 fprintf (stderr, " pcrel");
2853 if (fixp->fx_pcrel_adjust)
2854 fprintf (stderr, " pcrel_adjust=%d", fixp->fx_pcrel_adjust);
2855 if (fixp->fx_im_disp)
2858 fprintf (stderr, " im_disp=%d", fixp->fx_im_disp);
2860 fprintf (stderr, " im_disp");
2864 fprintf (stderr, " tcbit");
2866 fprintf (stderr, " done");
2867 fprintf (stderr, "\n size=%d frag=", fixp->fx_size);
2868 fprintf_vma (stderr, (bfd_vma) ((bfd_hostptr_t) fixp->fx_frag));
2869 fprintf (stderr, " where=%ld offset=%lx addnumber=%lx",
2870 (long) fixp->fx_where,
2871 (unsigned long) fixp->fx_offset,
2872 (unsigned long) fixp->fx_addnumber);
2873 fprintf (stderr, "\n %s (%d)", bfd_get_reloc_code_name (fixp->fx_r_type),
2877 fprintf (stderr, "\n +<");
2878 print_symbol_value_1 (stderr, fixp->fx_addsy);
2879 fprintf (stderr, ">");
2883 fprintf (stderr, "\n -<");
2884 print_symbol_value_1 (stderr, fixp->fx_subsy);
2885 fprintf (stderr, ">");
2887 fprintf (stderr, "\n");
2888 #ifdef TC_FIX_DATA_PRINT
2889 TC_FIX_DATA_PRINT (stderr, fixp);