1 /* write.c - emit .o file
2 Copyright (C) 1986-2014 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))
841 /* The fixup_segment routine normally will not use this
842 symbol in a relocation. */
846 /* Don't try to reduce relocs which refer to non-local symbols
847 in .linkonce sections. It can lead to confusion when a
848 debugging section refers to a .linkonce section. I hope
849 this will always be correct. */
850 if (symsec != sec && ! S_IS_LOCAL (sym))
852 if ((symsec->flags & SEC_LINK_ONCE) != 0
854 /* The GNU toolchain uses an extension for ELF: a
855 section beginning with the magic string
856 .gnu.linkonce is a linkonce section. */
857 && strncmp (segment_name (symsec), ".gnu.linkonce",
858 sizeof ".gnu.linkonce" - 1) == 0))
862 /* Never adjust a reloc against local symbol in a merge section
863 with non-zero addend. */
864 if ((symsec->flags & SEC_MERGE) != 0
865 && (fixp->fx_offset != 0 || fixp->fx_subsy != NULL))
868 /* Never adjust a reloc against TLS local symbol. */
869 if ((symsec->flags & SEC_THREAD_LOCAL) != 0)
872 /* We refetch the segment when calling section_symbol, rather
873 than using symsec, because S_GET_VALUE may wind up changing
874 the section when it calls resolve_symbol_value. */
875 fixp->fx_offset += S_GET_VALUE (sym);
876 fixp->fx_addsy = section_symbol (S_GET_SEGMENT (sym));
878 fprintf (stderr, "\nadjusted fixup:\n");
883 dump_section_relocs (abfd, sec, stderr);
888 Go through all the fixS's in a segment and see which ones can be
889 handled now. (These consist of fixS where we have since discovered
890 the value of a symbol, or the address of the frag involved.)
891 For each one, call md_apply_fix to put the fix into the frag data.
892 Ones that we couldn't completely handle here will be output later
893 by emit_relocations. */
896 fixup_segment (fixS *fixP, segT this_segment)
900 segT add_symbol_segment = absolute_section;
902 if (fixP != NULL && abs_section_sym == NULL)
903 abs_section_sym = section_symbol (absolute_section);
905 /* If the linker is doing the relaxing, we must not do any fixups.
907 Well, strictly speaking that's not true -- we could do any that
908 are PC-relative and don't cross regions that could change size.
909 And for the i960 we might be able to turn callx/callj into bal
910 anyways in cases where we know the maximum displacement. */
911 if (linkrelax && TC_LINKRELAX_FIXUP (this_segment))
913 for (; fixP; fixP = fixP->fx_next)
916 if (fixP->fx_addsy == NULL)
918 /* There was no symbol required by this relocation.
919 However, BFD doesn't really handle relocations
920 without symbols well. So fake up a local symbol in
921 the absolute section. */
922 fixP->fx_addsy = abs_section_sym;
924 symbol_mark_used_in_reloc (fixP->fx_addsy);
925 if (fixP->fx_subsy != NULL)
926 symbol_mark_used_in_reloc (fixP->fx_subsy);
931 for (; fixP; fixP = fixP->fx_next)
934 fprintf (stderr, "\nprocessing fixup:\n");
938 fragP = fixP->fx_frag;
940 #ifdef TC_VALIDATE_FIX
941 TC_VALIDATE_FIX (fixP, this_segment, skip);
943 add_number = fixP->fx_offset;
945 if (fixP->fx_addsy != NULL)
946 add_symbol_segment = S_GET_SEGMENT (fixP->fx_addsy);
948 if (fixP->fx_subsy != NULL)
950 segT sub_symbol_segment;
951 resolve_symbol_value (fixP->fx_subsy);
952 sub_symbol_segment = S_GET_SEGMENT (fixP->fx_subsy);
953 if (fixP->fx_addsy != NULL
954 && sub_symbol_segment == add_symbol_segment
955 && !S_FORCE_RELOC (fixP->fx_addsy, 0)
956 && !S_FORCE_RELOC (fixP->fx_subsy, 0)
957 && !TC_FORCE_RELOCATION_SUB_SAME (fixP, add_symbol_segment))
959 add_number += S_GET_VALUE (fixP->fx_addsy);
960 add_number -= S_GET_VALUE (fixP->fx_subsy);
961 fixP->fx_offset = add_number;
962 fixP->fx_addsy = NULL;
963 fixP->fx_subsy = NULL;
965 /* See the comment below about 68k weirdness. */
969 else if (sub_symbol_segment == absolute_section
970 && !S_FORCE_RELOC (fixP->fx_subsy, 0)
971 && !TC_FORCE_RELOCATION_SUB_ABS (fixP, add_symbol_segment))
973 add_number -= S_GET_VALUE (fixP->fx_subsy);
974 fixP->fx_offset = add_number;
975 fixP->fx_subsy = NULL;
977 else if (sub_symbol_segment == this_segment
978 && !S_FORCE_RELOC (fixP->fx_subsy, 0)
979 && !TC_FORCE_RELOCATION_SUB_LOCAL (fixP, add_symbol_segment))
981 add_number -= S_GET_VALUE (fixP->fx_subsy);
982 fixP->fx_offset = (add_number + fixP->fx_dot_value
983 + fixP->fx_dot_frag->fr_address);
985 /* Make it pc-relative. If the back-end code has not
986 selected a pc-relative reloc, cancel the adjustment
987 we do later on all pc-relative relocs. */
990 /* Do this for m68k even if it's already described
991 as pc-relative. On the m68k, an operand of
992 "pc@(foo-.-2)" should address "foo" in a
997 add_number += MD_PCREL_FROM_SECTION (fixP, this_segment);
998 fixP->fx_subsy = NULL;
1001 else if (!TC_VALIDATE_FIX_SUB (fixP, add_symbol_segment))
1003 if (!md_register_arithmetic
1004 && (add_symbol_segment == reg_section
1005 || sub_symbol_segment == reg_section))
1006 as_bad_where (fixP->fx_file, fixP->fx_line,
1007 _("register value used as expression"));
1009 as_bad_where (fixP->fx_file, fixP->fx_line,
1010 _("can't resolve `%s' {%s section} - `%s' {%s section}"),
1011 fixP->fx_addsy ? S_GET_NAME (fixP->fx_addsy) : "0",
1012 segment_name (add_symbol_segment),
1013 S_GET_NAME (fixP->fx_subsy),
1014 segment_name (sub_symbol_segment));
1016 else if (sub_symbol_segment != undefined_section
1017 && ! bfd_is_com_section (sub_symbol_segment)
1018 && MD_APPLY_SYM_VALUE (fixP))
1019 add_number -= S_GET_VALUE (fixP->fx_subsy);
1024 if (add_symbol_segment == this_segment
1025 && !S_FORCE_RELOC (fixP->fx_addsy, 0)
1026 && !TC_FORCE_RELOCATION_LOCAL (fixP))
1028 /* This fixup was made when the symbol's segment was
1029 SEG_UNKNOWN, but it is now in the local segment.
1030 So we know how to do the address without relocation. */
1031 add_number += S_GET_VALUE (fixP->fx_addsy);
1032 fixP->fx_offset = add_number;
1034 add_number -= MD_PCREL_FROM_SECTION (fixP, this_segment);
1035 fixP->fx_addsy = NULL;
1038 else if (add_symbol_segment == absolute_section
1039 && !S_FORCE_RELOC (fixP->fx_addsy, 0)
1040 && !TC_FORCE_RELOCATION_ABS (fixP))
1042 add_number += S_GET_VALUE (fixP->fx_addsy);
1043 fixP->fx_offset = add_number;
1044 fixP->fx_addsy = NULL;
1046 else if (add_symbol_segment != undefined_section
1047 && ! bfd_is_com_section (add_symbol_segment)
1048 && MD_APPLY_SYM_VALUE (fixP))
1049 add_number += S_GET_VALUE (fixP->fx_addsy);
1054 add_number -= MD_PCREL_FROM_SECTION (fixP, this_segment);
1055 if (!fixP->fx_done && fixP->fx_addsy == NULL)
1057 /* There was no symbol required by this relocation.
1058 However, BFD doesn't really handle relocations
1059 without symbols well. So fake up a local symbol in
1060 the absolute section. */
1061 fixP->fx_addsy = abs_section_sym;
1066 md_apply_fix (fixP, &add_number, this_segment);
1070 if (fixP->fx_addsy == NULL)
1071 fixP->fx_addsy = abs_section_sym;
1072 symbol_mark_used_in_reloc (fixP->fx_addsy);
1073 if (fixP->fx_subsy != NULL)
1074 symbol_mark_used_in_reloc (fixP->fx_subsy);
1077 if (!fixP->fx_bit_fixP && !fixP->fx_no_overflow && fixP->fx_size != 0)
1079 if (fixP->fx_size < sizeof (valueT))
1084 mask--; /* Set all bits to one. */
1085 mask <<= fixP->fx_size * 8 - (fixP->fx_signed ? 1 : 0);
1086 if ((add_number & mask) != 0 && (add_number & mask) != mask)
1088 char buf[50], buf2[50];
1089 sprint_value (buf, fragP->fr_address + fixP->fx_where);
1090 if (add_number > 1000)
1091 sprint_value (buf2, add_number);
1093 sprintf (buf2, "%ld", (long) add_number);
1094 as_bad_where (fixP->fx_file, fixP->fx_line,
1095 _("value of %s too large for field of %d bytes at %s"),
1096 buf2, fixP->fx_size, buf);
1097 } /* Generic error checking. */
1099 #ifdef WARN_SIGNED_OVERFLOW_WORD
1100 /* Warn if a .word value is too large when treated as a signed
1101 number. We already know it is not too negative. This is to
1102 catch over-large switches generated by gcc on the 68k. */
1103 if (!flag_signed_overflow_ok
1104 && fixP->fx_size == 2
1105 && add_number > 0x7fff)
1106 as_bad_where (fixP->fx_file, fixP->fx_line,
1107 _("signed .word overflow; switch may be too large; %ld at 0x%lx"),
1109 (long) (fragP->fr_address + fixP->fx_where));
1111 } /* Not a bit fix. */
1113 #ifdef TC_VALIDATE_FIX
1114 skip: ATTRIBUTE_UNUSED_LABEL
1118 fprintf (stderr, "result:\n");
1121 } /* For each fixS in this segment. */
1125 fix_segment (bfd *abfd ATTRIBUTE_UNUSED,
1127 void *xxx ATTRIBUTE_UNUSED)
1129 segment_info_type *seginfo = seg_info (sec);
1131 fixup_segment (seginfo->fix_root, sec);
1135 install_reloc (asection *sec, arelent *reloc, fragS *fragp,
1136 char *file, unsigned int line)
1139 bfd_reloc_status_type s;
1142 if (reloc->sym_ptr_ptr != NULL
1143 && (sym = *reloc->sym_ptr_ptr) != NULL
1144 && (sym->flags & BSF_KEEP) == 0
1145 && ((sym->flags & BSF_SECTION_SYM) == 0
1146 || (EMIT_SECTION_SYMBOLS
1147 && !bfd_is_abs_section (sym->section))))
1148 as_bad_where (file, line, _("redefined symbol cannot be used on reloc"));
1150 s = bfd_install_relocation (stdoutput, reloc,
1151 fragp->fr_literal, fragp->fr_address,
1157 case bfd_reloc_overflow:
1158 as_bad_where (file, line, _("relocation overflow"));
1160 case bfd_reloc_outofrange:
1161 as_bad_where (file, line, _("relocation out of range"));
1164 as_fatal (_("%s:%u: bad return from bfd_install_relocation: %x"),
1170 get_frag_for_reloc (fragS *last_frag,
1171 const segment_info_type *seginfo,
1172 const struct reloc_list *r)
1176 for (f = last_frag; f != NULL; f = f->fr_next)
1177 if (f->fr_address <= r->u.b.r.address
1178 && r->u.b.r.address < f->fr_address + f->fr_fix)
1181 for (f = seginfo->frchainP->frch_root; f != NULL; f = f->fr_next)
1182 if (f->fr_address <= r->u.b.r.address
1183 && r->u.b.r.address < f->fr_address + f->fr_fix)
1186 as_bad_where (r->file, r->line,
1187 _("reloc not within (fixed part of) section"));
1192 write_relocs (bfd *abfd, asection *sec, void *xxx ATTRIBUTE_UNUSED)
1194 segment_info_type *seginfo = seg_info (sec);
1196 struct reloc_list *my_reloc_list, **rp, *r;
1201 /* If seginfo is NULL, we did not create this section; don't do
1202 anything with it. */
1203 if (seginfo == NULL)
1207 for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next)
1211 #ifdef RELOC_EXPANSION_POSSIBLE
1212 n *= MAX_RELOC_EXPANSION;
1215 /* Extract relocs for this section from reloc_list. */
1217 my_reloc_list = NULL;
1218 while ((r = *rp) != NULL)
1220 if (r->u.b.sec == sec)
1223 r->next = my_reloc_list;
1231 relocs = (arelent **) xcalloc (n, sizeof (arelent *));
1236 for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next)
1241 #ifndef RELOC_EXPANSION_POSSIBLE
1250 fx_size = fixp->fx_size;
1251 slack = TC_FX_SIZE_SLACK (fixp);
1253 fx_size = fx_size > slack ? fx_size - slack : 0;
1254 loc = fixp->fx_where + fx_size;
1255 if (slack >= 0 && loc > fixp->fx_frag->fr_fix)
1256 as_bad_where (fixp->fx_file, fixp->fx_line,
1257 _("internal error: fixup not contained within frag"));
1259 #ifndef RELOC_EXPANSION_POSSIBLE
1260 *reloc = tc_gen_reloc (sec, fixp);
1262 reloc = tc_gen_reloc (sec, fixp);
1267 while (r != NULL && r->u.b.r.address < (*reloc)->address)
1269 fragS *f = get_frag_for_reloc (last_frag, seginfo, r);
1273 relocs[n++] = &r->u.b.r;
1274 install_reloc (sec, &r->u.b.r, f, r->file, r->line);
1278 relocs[n++] = *reloc;
1279 install_reloc (sec, *reloc, fixp->fx_frag,
1280 fixp->fx_file, fixp->fx_line);
1281 #ifndef RELOC_EXPANSION_POSSIBLE
1291 fragS *f = get_frag_for_reloc (last_frag, seginfo, r);
1295 relocs[n++] = &r->u.b.r;
1296 install_reloc (sec, &r->u.b.r, f, r->file, r->line);
1303 unsigned int k, j, nsyms;
1305 sympp = bfd_get_outsymbols (stdoutput);
1306 nsyms = bfd_get_symcount (stdoutput);
1307 for (k = 0; k < n; k++)
1308 if (((*relocs[k]->sym_ptr_ptr)->flags & BSF_SECTION_SYM) == 0)
1310 for (j = 0; j < nsyms; j++)
1311 if (sympp[j] == *relocs[k]->sym_ptr_ptr)
1321 flagword flags = bfd_get_section_flags (abfd, sec);
1323 bfd_set_section_flags (abfd, sec, flags);
1324 bfd_set_reloc (stdoutput, sec, relocs, n);
1327 #ifdef SET_SECTION_RELOCS
1328 SET_SECTION_RELOCS (sec, relocs, n);
1335 fprintf (stderr, "relocs for sec %s\n", sec->name);
1336 for (k = 0; k < n; k++)
1338 arelent *rel = relocs[k];
1339 asymbol *s = *rel->sym_ptr_ptr;
1340 fprintf (stderr, " reloc %2d @%p off %4lx : sym %-10s addend %lx\n",
1341 k, rel, (unsigned long)rel->address, s->name,
1342 (unsigned long)rel->addend);
1349 compress_frag (struct z_stream_s *strm, const char *contents, int in_size,
1350 fragS **last_newf, struct obstack *ob)
1353 int total_out_size = 0;
1354 fragS *f = *last_newf;
1358 /* Call the compression routine repeatedly until it has finished
1359 processing the frag. */
1362 /* Reserve all the space available in the current chunk.
1363 If none is available, start a new frag. */
1364 avail_out = obstack_room (ob);
1367 obstack_finish (ob);
1368 f = frag_alloc (ob);
1369 f->fr_type = rs_fill;
1370 (*last_newf)->fr_next = f;
1372 avail_out = obstack_room (ob);
1375 as_fatal (_("can't extend frag"));
1376 next_out = obstack_next_free (ob);
1377 obstack_blank_fast (ob, avail_out);
1378 out_size = compress_data (strm, &contents, &in_size,
1379 &next_out, &avail_out);
1383 f->fr_fix += out_size;
1384 total_out_size += out_size;
1386 /* Return unused space. */
1388 obstack_blank_fast (ob, -avail_out);
1391 return total_out_size;
1395 compress_debug (bfd *abfd, asection *sec, void *xxx ATTRIBUTE_UNUSED)
1397 segment_info_type *seginfo = seg_info (sec);
1401 struct obstack *ob = &seginfo->frchainP->frch_obstack;
1402 bfd_size_type uncompressed_size = (bfd_size_type) sec->size;
1403 bfd_size_type compressed_size;
1404 const char *section_name;
1405 char *compressed_name;
1407 struct z_stream_s *strm;
1409 flagword flags = bfd_get_section_flags (abfd, sec);
1413 || (flags & (SEC_ALLOC | SEC_HAS_CONTENTS)) == SEC_ALLOC)
1416 section_name = bfd_get_section_name (stdoutput, sec);
1417 if (strncmp (section_name, ".debug_", 7) != 0)
1420 strm = compress_init ();
1424 /* Create a new frag to contain the "ZLIB" header. */
1425 first_newf = frag_alloc (ob);
1426 if (obstack_room (ob) < 12)
1427 first_newf = frag_alloc (ob);
1428 if (obstack_room (ob) < 12)
1429 as_fatal (_("can't extend frag %u chars"), 12);
1430 last_newf = first_newf;
1431 obstack_blank_fast (ob, 12);
1432 last_newf->fr_type = rs_fill;
1433 last_newf->fr_fix = 12;
1434 header = last_newf->fr_literal;
1435 memcpy (header, "ZLIB", 4);
1436 header[11] = uncompressed_size; uncompressed_size >>= 8;
1437 header[10] = uncompressed_size; uncompressed_size >>= 8;
1438 header[9] = uncompressed_size; uncompressed_size >>= 8;
1439 header[8] = uncompressed_size; uncompressed_size >>= 8;
1440 header[7] = uncompressed_size; uncompressed_size >>= 8;
1441 header[6] = uncompressed_size; uncompressed_size >>= 8;
1442 header[5] = uncompressed_size; uncompressed_size >>= 8;
1443 header[4] = uncompressed_size;
1444 compressed_size = 12;
1446 /* Stream the frags through the compression engine, adding new frags
1447 as necessary to accomodate the compressed output. */
1448 for (f = seginfo->frchainP->frch_root;
1457 gas_assert (f->fr_type == rs_fill);
1460 out_size = compress_frag (strm, f->fr_literal, f->fr_fix,
1464 compressed_size += out_size;
1466 fill_literal = f->fr_literal + f->fr_fix;
1467 fill_size = f->fr_var;
1468 count = f->fr_offset;
1469 gas_assert (count >= 0);
1470 if (fill_size && count)
1474 out_size = compress_frag (strm, fill_literal, (int) fill_size,
1478 compressed_size += out_size;
1483 /* Flush the compression state. */
1490 /* Reserve all the space available in the current chunk.
1491 If none is available, start a new frag. */
1492 avail_out = obstack_room (ob);
1497 obstack_finish (ob);
1498 newf = frag_alloc (ob);
1499 newf->fr_type = rs_fill;
1500 last_newf->fr_next = newf;
1502 avail_out = obstack_room (ob);
1505 as_fatal (_("can't extend frag"));
1506 next_out = obstack_next_free (ob);
1507 obstack_blank_fast (ob, avail_out);
1508 x = compress_finish (strm, &next_out, &avail_out, &out_size);
1512 last_newf->fr_fix += out_size;
1513 compressed_size += out_size;
1515 /* Return unused space. */
1517 obstack_blank_fast (ob, -avail_out);
1523 /* Replace the uncompressed frag list with the compressed frag list. */
1524 seginfo->frchainP->frch_root = first_newf;
1525 seginfo->frchainP->frch_last = last_newf;
1527 /* Update the section size and its name. */
1528 x = bfd_set_section_size (abfd, sec, compressed_size);
1530 compressed_name = (char *) xmalloc (strlen (section_name) + 2);
1531 compressed_name[0] = '.';
1532 compressed_name[1] = 'z';
1533 strcpy (compressed_name + 2, section_name + 1);
1534 bfd_section_name (stdoutput, sec) = compressed_name;
1538 write_contents (bfd *abfd ATTRIBUTE_UNUSED,
1540 void *xxx ATTRIBUTE_UNUSED)
1542 segment_info_type *seginfo = seg_info (sec);
1543 addressT offset = 0;
1546 /* Write out the frags. */
1548 || !(bfd_get_section_flags (abfd, sec) & SEC_HAS_CONTENTS))
1551 for (f = seginfo->frchainP->frch_root;
1560 gas_assert (f->fr_type == rs_fill);
1563 x = bfd_set_section_contents (stdoutput, sec,
1564 f->fr_literal, (file_ptr) offset,
1565 (bfd_size_type) f->fr_fix);
1567 as_fatal (_("can't write %s: %s"), stdoutput->filename,
1568 bfd_errmsg (bfd_get_error ()));
1569 offset += f->fr_fix;
1571 fill_literal = f->fr_literal + f->fr_fix;
1572 fill_size = f->fr_var;
1573 count = f->fr_offset;
1574 gas_assert (count >= 0);
1575 if (fill_size && count)
1578 if (fill_size > sizeof (buf))
1580 /* Do it the old way. Can this ever happen? */
1583 x = bfd_set_section_contents (stdoutput, sec,
1586 (bfd_size_type) fill_size);
1588 as_fatal (_("can't write %s: %s"), stdoutput->filename,
1589 bfd_errmsg (bfd_get_error ()));
1590 offset += fill_size;
1595 /* Build a buffer full of fill objects and output it as
1596 often as necessary. This saves on the overhead of
1597 potentially lots of bfd_set_section_contents calls. */
1601 n_per_buf = sizeof (buf);
1602 memset (buf, *fill_literal, n_per_buf);
1607 n_per_buf = sizeof (buf) / fill_size;
1608 for (i = n_per_buf, bufp = buf; i; i--, bufp += fill_size)
1609 memcpy (bufp, fill_literal, fill_size);
1611 for (; count > 0; count -= n_per_buf)
1613 n_per_buf = n_per_buf > count ? count : n_per_buf;
1614 x = bfd_set_section_contents
1615 (stdoutput, sec, buf, (file_ptr) offset,
1616 (bfd_size_type) n_per_buf * fill_size);
1618 as_fatal (_("cannot write to output file '%s': %s"),
1619 stdoutput->filename,
1620 bfd_errmsg (bfd_get_error ()));
1621 offset += n_per_buf * fill_size;
1629 merge_data_into_text (void)
1631 seg_info (text_section)->frchainP->frch_last->fr_next =
1632 seg_info (data_section)->frchainP->frch_root;
1633 seg_info (text_section)->frchainP->frch_last =
1634 seg_info (data_section)->frchainP->frch_last;
1635 seg_info (data_section)->frchainP = 0;
1646 /* Count symbols. We can't rely on a count made by the loop in
1647 write_object_file, because *_frob_file may add a new symbol or
1650 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
1656 bfd_size_type amt = (bfd_size_type) nsyms * sizeof (asymbol *);
1658 asympp = (asymbol **) bfd_alloc (stdoutput, amt);
1659 symp = symbol_rootP;
1660 for (i = 0; i < nsyms; i++, symp = symbol_next (symp))
1662 asympp[i] = symbol_get_bfdsym (symp);
1663 if (asympp[i]->flags != BSF_SECTION_SYM
1664 || !(bfd_is_const_section (asympp[i]->section)
1665 && asympp[i]->section->symbol == asympp[i]))
1666 asympp[i]->flags |= BSF_KEEP;
1667 symbol_mark_written (symp);
1672 result = bfd_set_symtab (stdoutput, asympp, nsyms);
1673 gas_assert (result);
1674 symbol_table_frozen = 1;
1677 /* Finish the subsegments. After every sub-segment, we fake an
1678 ".align ...". This conforms to BSD4.2 brane-damage. We then fake
1679 ".fill 0" because that is the kind of frag that requires least
1680 thought. ".align" frags like to have a following frag since that
1681 makes calculating their intended length trivial. */
1683 #ifndef SUB_SEGMENT_ALIGN
1685 /* The last subsegment gets an alignment corresponding to the alignment
1686 of the section. This allows proper nop-filling at the end of
1687 code-bearing sections. */
1688 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) \
1689 (!(FRCHAIN)->frch_next ? get_recorded_alignment (SEG) : 0)
1691 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) 0
1696 subsegs_finish_section (asection *s)
1698 struct frchain *frchainP;
1699 segment_info_type *seginfo = seg_info (s);
1703 for (frchainP = seginfo->frchainP;
1705 frchainP = frchainP->frch_next)
1709 subseg_set (s, frchainP->frch_subseg);
1711 /* This now gets called even if we had errors. In that case,
1712 any alignment is meaningless, and, moreover, will look weird
1713 if we are generating a listing. */
1716 alignment = SUB_SEGMENT_ALIGN (now_seg, frchainP);
1717 if ((bfd_get_section_flags (now_seg->owner, now_seg) & SEC_MERGE)
1718 && now_seg->entsize)
1720 unsigned int entsize = now_seg->entsize;
1723 while ((entsize & 1) == 0)
1729 if (entalign > alignment)
1730 alignment = entalign;
1734 if (subseg_text_p (now_seg))
1735 frag_align_code (alignment, 0);
1737 frag_align (alignment, 0, 0);
1739 /* frag_align will have left a new frag.
1740 Use this last frag for an empty ".fill".
1742 For this segment ...
1743 Create a last frag. Do not leave a "being filled in frag". */
1744 frag_wane (frag_now);
1745 frag_now->fr_fix = 0;
1746 know (frag_now->fr_next == NULL);
1751 subsegs_finish (void)
1755 for (s = stdoutput->sections; s; s = s->next)
1756 subsegs_finish_section (s);
1761 create_obj_attrs_section (void)
1768 size = bfd_elf_obj_attr_size (stdoutput);
1771 name = get_elf_backend_data (stdoutput)->obj_attrs_section;
1773 name = ".gnu.attributes";
1774 s = subseg_new (name, 0);
1775 elf_section_type (s)
1776 = get_elf_backend_data (stdoutput)->obj_attrs_section_type;
1777 bfd_set_section_flags (stdoutput, s, SEC_READONLY | SEC_DATA);
1779 p = frag_more (size);
1780 bfd_elf_set_obj_attr_contents (stdoutput, (bfd_byte *)p, size);
1782 subsegs_finish_section (s);
1783 relax_segment (seg_info (s)->frchainP->frch_root, s, 0);
1784 size_seg (stdoutput, s, NULL);
1789 /* Write the object file. */
1792 write_object_file (void)
1794 struct relax_seg_info rsi;
1795 #ifndef WORKING_DOT_WORD
1796 fragS *fragP; /* Track along all frags. */
1801 #ifdef md_pre_output_hook
1805 #ifdef md_pre_relax_hook
1809 /* From now on, we don't care about sub-segments. Build one frag chain
1810 for each segment. Linked thru fr_next. */
1812 /* Remove the sections created by gas for its own purposes. */
1816 bfd_section_list_remove (stdoutput, reg_section);
1817 bfd_section_list_remove (stdoutput, expr_section);
1818 stdoutput->section_count -= 2;
1820 bfd_map_over_sections (stdoutput, renumber_sections, &i);
1823 bfd_map_over_sections (stdoutput, chain_frchains_together, (char *) 0);
1825 /* We have two segments. If user gave -R flag, then we must put the
1826 data frags into the text segment. Do this before relaxing so
1827 we know to take advantage of -R and make shorter addresses. */
1828 if (flag_readonly_data_in_text)
1830 merge_data_into_text ();
1836 #ifndef WORKING_DOT_WORD
1837 /* We need to reset the markers in the broken word list and
1838 associated frags between calls to relax_segment (via
1839 relax_seg). Since the broken word list is global, we do it
1840 once per round, rather than locally in relax_segment for each
1842 struct broken_word *brokp;
1844 for (brokp = broken_words;
1845 brokp != (struct broken_word *) NULL;
1846 brokp = brokp->next_broken_word)
1850 if (brokp->dispfrag != (fragS *) NULL
1851 && brokp->dispfrag->fr_type == rs_broken_word)
1852 brokp->dispfrag->fr_subtype = 0;
1857 bfd_map_over_sections (stdoutput, relax_seg, &rsi);
1863 /* Note - Most ports will use the default value of
1864 TC_FINALIZE_SYMS_BEFORE_SIZE_SEG, which 1. This will force
1865 local symbols to be resolved, removing their frag information.
1866 Some ports however, will not have finished relaxing all of
1867 their frags and will still need the local symbol frag
1868 information. These ports can set
1869 TC_FINALIZE_SYMS_BEFORE_SIZE_SEG to 0. */
1870 finalize_syms = TC_FINALIZE_SYMS_BEFORE_SIZE_SEG;
1872 bfd_map_over_sections (stdoutput, size_seg, (char *) 0);
1874 /* Relaxation has completed. Freeze all syms. */
1877 #ifdef md_post_relax_hook
1883 create_obj_attrs_section ();
1886 #ifndef WORKING_DOT_WORD
1888 struct broken_word *lie;
1889 struct broken_word **prevP;
1891 prevP = &broken_words;
1892 for (lie = broken_words; lie; lie = lie->next_broken_word)
1897 subseg_change (lie->seg, lie->subseg);
1898 exp.X_op = O_subtract;
1899 exp.X_add_symbol = lie->add;
1900 exp.X_op_symbol = lie->sub;
1901 exp.X_add_number = lie->addnum;
1902 #ifdef TC_CONS_FIX_NEW
1903 TC_CONS_FIX_NEW (lie->frag,
1904 lie->word_goes_here - lie->frag->fr_literal,
1905 2, &exp, TC_PARSE_CONS_RETURN_NONE);
1907 fix_new_exp (lie->frag,
1908 lie->word_goes_here - lie->frag->fr_literal,
1909 2, &exp, 0, BFD_RELOC_16);
1911 *prevP = lie->next_broken_word;
1914 prevP = &(lie->next_broken_word);
1916 for (lie = broken_words; lie;)
1918 struct broken_word *untruth;
1920 addressT table_addr;
1921 addressT from_addr, to_addr;
1924 subseg_change (lie->seg, lie->subseg);
1925 fragP = lie->dispfrag;
1927 /* Find out how many broken_words go here. */
1930 untruth && untruth->dispfrag == fragP;
1931 untruth = untruth->next_broken_word)
1932 if (untruth->added == 1)
1935 table_ptr = lie->dispfrag->fr_opcode;
1936 table_addr = (lie->dispfrag->fr_address
1937 + (table_ptr - lie->dispfrag->fr_literal));
1938 /* Create the jump around the long jumps. This is a short
1939 jump from table_ptr+0 to table_ptr+n*long_jump_size. */
1940 from_addr = table_addr;
1941 to_addr = table_addr + md_short_jump_size + n * md_long_jump_size;
1942 md_create_short_jump (table_ptr, from_addr, to_addr, lie->dispfrag,
1944 table_ptr += md_short_jump_size;
1945 table_addr += md_short_jump_size;
1948 lie && lie->dispfrag == fragP;
1949 m++, lie = lie->next_broken_word)
1951 if (lie->added == 2)
1953 /* Patch the jump table. */
1954 for (untruth = (struct broken_word *) (fragP->fr_symbol);
1955 untruth && untruth->dispfrag == fragP;
1956 untruth = untruth->next_broken_word)
1958 if (untruth->use_jump == lie)
1960 /* This is the offset from ??? to table_ptr+0.
1961 The target is the same for all users of this
1962 md_long_jump, but the "sub" bases (and hence the
1963 offsets) may be different. */
1964 addressT to_word = table_addr - S_GET_VALUE (untruth->sub);
1965 #ifdef TC_CHECK_ADJUSTED_BROKEN_DOT_WORD
1966 TC_CHECK_ADJUSTED_BROKEN_DOT_WORD (to_word, untruth);
1968 md_number_to_chars (untruth->word_goes_here, to_word, 2);
1972 /* Install the long jump. */
1973 /* This is a long jump from table_ptr+0 to the final target. */
1974 from_addr = table_addr;
1975 to_addr = S_GET_VALUE (lie->add) + lie->addnum;
1976 md_create_long_jump (table_ptr, from_addr, to_addr, lie->dispfrag,
1978 table_ptr += md_long_jump_size;
1979 table_addr += md_long_jump_size;
1983 #endif /* not WORKING_DOT_WORD */
1985 /* Resolve symbol values. This needs to be done before processing
1991 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
1992 resolve_symbol_value (symp);
1994 resolve_local_symbol_values ();
1995 resolve_reloc_expr_symbols ();
1999 #ifdef tc_frob_file_before_adjust
2000 tc_frob_file_before_adjust ();
2002 #ifdef obj_frob_file_before_adjust
2003 obj_frob_file_before_adjust ();
2006 bfd_map_over_sections (stdoutput, adjust_reloc_syms, (char *) 0);
2008 #ifdef tc_frob_file_before_fix
2009 tc_frob_file_before_fix ();
2011 #ifdef obj_frob_file_before_fix
2012 obj_frob_file_before_fix ();
2015 bfd_map_over_sections (stdoutput, fix_segment, (char *) 0);
2017 /* Set up symbol table, and write it out. */
2021 bfd_boolean skip_next_symbol = FALSE;
2023 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
2028 if (skip_next_symbol)
2030 /* Don't do anything besides moving the value of the
2031 symbol from the GAS value-field to the BFD value-field. */
2032 symbol_get_bfdsym (symp)->value = S_GET_VALUE (symp);
2033 skip_next_symbol = FALSE;
2037 if (symbol_mri_common_p (symp))
2039 if (S_IS_EXTERNAL (symp))
2040 as_bad (_("%s: global symbols not supported in common sections"),
2042 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
2046 name = S_GET_NAME (symp);
2050 decode_local_label_name ((char *) S_GET_NAME (symp));
2051 /* They only differ if `name' is a fb or dollar local
2053 if (name2 != name && ! S_IS_DEFINED (symp))
2054 as_bad (_("local label `%s' is not defined"), name2);
2057 /* Do it again, because adjust_reloc_syms might introduce
2058 more symbols. They'll probably only be section symbols,
2059 but they'll still need to have the values computed. */
2060 resolve_symbol_value (symp);
2062 /* Skip symbols which were equated to undefined or common
2064 if (symbol_equated_reloc_p (symp)
2065 || S_IS_WEAKREFR (symp))
2067 const char *sname = S_GET_NAME (symp);
2069 if (S_IS_COMMON (symp)
2070 && !TC_FAKE_LABEL (sname)
2071 && !S_IS_WEAKREFR (symp)
2072 && (!S_IS_EXTERNAL (symp) || S_IS_LOCAL (symp)))
2074 expressionS *e = symbol_get_value_expression (symp);
2076 as_bad (_("Local symbol `%s' can't be equated to common symbol `%s'"),
2077 sname, S_GET_NAME (e->X_add_symbol));
2079 if (S_GET_SEGMENT (symp) == reg_section)
2081 /* Report error only if we know the symbol name. */
2082 if (S_GET_NAME (symp) != reg_section->name)
2083 as_bad (_("can't make global register symbol `%s'"),
2086 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
2090 #ifdef obj_frob_symbol
2091 obj_frob_symbol (symp, punt);
2093 #ifdef tc_frob_symbol
2094 if (! punt || symbol_used_in_reloc_p (symp))
2095 tc_frob_symbol (symp, punt);
2098 /* If we don't want to keep this symbol, splice it out of
2099 the chain now. If EMIT_SECTION_SYMBOLS is 0, we never
2100 want section symbols. Otherwise, we skip local symbols
2101 and symbols that the frob_symbol macros told us to punt,
2102 but we keep such symbols if they are used in relocs. */
2103 if (symp == abs_section_sym
2104 || (! EMIT_SECTION_SYMBOLS
2105 && symbol_section_p (symp))
2106 /* Note that S_IS_EXTERNAL and S_IS_LOCAL are not always
2107 opposites. Sometimes the former checks flags and the
2108 latter examines the name... */
2109 || (!S_IS_EXTERNAL (symp)
2110 && (punt || S_IS_LOCAL (symp) ||
2111 (S_IS_WEAKREFD (symp) && ! symbol_used_p (symp)))
2112 && ! symbol_used_in_reloc_p (symp)))
2114 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
2116 /* After symbol_remove, symbol_next(symp) still returns
2117 the one that came after it in the chain. So we don't
2118 need to do any extra cleanup work here. */
2122 /* Make sure we really got a value for the symbol. */
2123 if (! symbol_resolved_p (symp))
2125 as_bad (_("can't resolve value for symbol `%s'"),
2127 symbol_mark_resolved (symp);
2130 /* Set the value into the BFD symbol. Up til now the value
2131 has only been kept in the gas symbolS struct. */
2132 symbol_get_bfdsym (symp)->value = S_GET_VALUE (symp);
2134 /* A warning construct is a warning symbol followed by the
2135 symbol warned about. Don't let anything object-format or
2136 target-specific muck with it; it's ready for output. */
2137 if (symbol_get_bfdsym (symp)->flags & BSF_WARNING)
2138 skip_next_symbol = TRUE;
2144 /* Now do any format-specific adjustments to the symbol table, such
2145 as adding file symbols. */
2146 #ifdef tc_adjust_symtab
2147 tc_adjust_symtab ();
2149 #ifdef obj_adjust_symtab
2150 obj_adjust_symtab ();
2153 /* Stop if there is an error. */
2157 /* Now that all the sizes are known, and contents correct, we can
2158 start writing to the file. */
2161 /* If *_frob_file changes the symbol value at this point, it is
2162 responsible for moving the changed value into symp->bsym->value
2163 as well. Hopefully all symbol value changing can be done in
2168 #ifdef obj_frob_file
2171 #ifdef obj_coff_generate_pdata
2172 obj_coff_generate_pdata ();
2174 bfd_map_over_sections (stdoutput, write_relocs, (char *) 0);
2176 #ifdef tc_frob_file_after_relocs
2177 tc_frob_file_after_relocs ();
2179 #ifdef obj_frob_file_after_relocs
2180 obj_frob_file_after_relocs ();
2183 /* Once all relocations have been written, we can compress the
2184 contents of the debug sections. This needs to be done before
2185 we start writing any sections, because it will affect the file
2186 layout, which is fixed once we start writing contents. */
2187 if (flag_compress_debug)
2188 bfd_map_over_sections (stdoutput, compress_debug, (char *) 0);
2190 bfd_map_over_sections (stdoutput, write_contents, (char *) 0);
2193 #ifdef TC_GENERIC_RELAX_TABLE
2194 /* Relax a fragment by scanning TC_GENERIC_RELAX_TABLE. */
2197 relax_frag (segT segment, fragS *fragP, long stretch)
2199 const relax_typeS *this_type;
2200 const relax_typeS *start_type;
2201 relax_substateT next_state;
2202 relax_substateT this_state;
2208 const relax_typeS *table;
2210 target = fragP->fr_offset;
2211 address = fragP->fr_address;
2212 table = TC_GENERIC_RELAX_TABLE;
2213 this_state = fragP->fr_subtype;
2214 start_type = this_type = table + this_state;
2215 symbolP = fragP->fr_symbol;
2221 sym_frag = symbol_get_frag (symbolP);
2223 #ifndef DIFF_EXPR_OK
2224 know (sym_frag != NULL);
2226 know (S_GET_SEGMENT (symbolP) != absolute_section
2227 || sym_frag == &zero_address_frag);
2228 target += S_GET_VALUE (symbolP);
2230 /* If SYM_FRAG has yet to be reached on this pass, assume it
2231 will move by STRETCH just as we did, unless there is an
2232 alignment frag between here and SYM_FRAG. An alignment may
2233 well absorb any STRETCH, and we don't want to choose a larger
2234 branch insn by overestimating the needed reach of this
2235 branch. It isn't critical to calculate TARGET exactly; We
2236 know we'll be doing another pass if STRETCH is non-zero. */
2239 && sym_frag->relax_marker != fragP->relax_marker
2240 && S_GET_SEGMENT (symbolP) == segment)
2243 || sym_frag->region == fragP->region)
2245 /* If we get here we know we have a forward branch. This
2246 relax pass may have stretched previous instructions so
2247 far that omitting STRETCH would make the branch
2248 negative. Don't allow this in case the negative reach is
2249 large enough to require a larger branch instruction. */
2250 else if (target < address)
2251 target = fragP->fr_next->fr_address + stretch;
2255 aim = target - address - fragP->fr_fix;
2256 #ifdef TC_PCREL_ADJUST
2257 /* Currently only the ns32k family needs this. */
2258 aim += TC_PCREL_ADJUST (fragP);
2261 #ifdef md_prepare_relax_scan
2262 /* Formerly called M68K_AIM_KLUDGE. */
2263 md_prepare_relax_scan (fragP, address, aim, this_state, this_type);
2268 /* Look backwards. */
2269 for (next_state = this_type->rlx_more; next_state;)
2270 if (aim >= this_type->rlx_backward)
2274 /* Grow to next state. */
2275 this_state = next_state;
2276 this_type = table + this_state;
2277 next_state = this_type->rlx_more;
2282 /* Look forwards. */
2283 for (next_state = this_type->rlx_more; next_state;)
2284 if (aim <= this_type->rlx_forward)
2288 /* Grow to next state. */
2289 this_state = next_state;
2290 this_type = table + this_state;
2291 next_state = this_type->rlx_more;
2295 growth = this_type->rlx_length - start_type->rlx_length;
2297 fragP->fr_subtype = this_state;
2301 #endif /* defined (TC_GENERIC_RELAX_TABLE) */
2303 /* Relax_align. Advance location counter to next address that has 'alignment'
2304 lowest order bits all 0s, return size of adjustment made. */
2305 static relax_addressT
2306 relax_align (register relax_addressT address, /* Address now. */
2307 register int alignment /* Alignment (binary). */)
2309 relax_addressT mask;
2310 relax_addressT new_address;
2312 mask = ~((relax_addressT) ~0 << alignment);
2313 new_address = (address + mask) & (~mask);
2314 #ifdef LINKER_RELAXING_SHRINKS_ONLY
2316 /* We must provide lots of padding, so the linker can discard it
2317 when needed. The linker will not add extra space, ever. */
2318 new_address += (1 << alignment);
2320 return (new_address - address);
2323 /* Now we have a segment, not a crowd of sub-segments, we can make
2328 After this, all frags in this segment have addresses that are correct
2329 within the segment. Since segments live in different file addresses,
2330 these frag addresses may not be the same as final object-file
2334 relax_segment (struct frag *segment_frag_root, segT segment, int pass)
2336 unsigned long frag_count;
2338 relax_addressT address;
2342 /* In case md_estimate_size_before_relax() wants to make fixSs. */
2343 subseg_change (segment, 0);
2345 /* For each frag in segment: count and store (a 1st guess of)
2349 for (frag_count = 0, fragP = segment_frag_root;
2351 fragP = fragP->fr_next, frag_count ++)
2353 fragP->region = region;
2354 fragP->relax_marker = 0;
2355 fragP->fr_address = address;
2356 address += fragP->fr_fix;
2358 switch (fragP->fr_type)
2361 address += fragP->fr_offset * fragP->fr_var;
2368 addressT offset = relax_align (address, (int) fragP->fr_offset);
2370 if (fragP->fr_subtype != 0 && offset > fragP->fr_subtype)
2373 if (offset % fragP->fr_var != 0)
2375 as_bad_where (fragP->fr_file, fragP->fr_line,
2376 _("alignment padding (%lu bytes) not a multiple of %ld"),
2377 (unsigned long) offset, (long) fragP->fr_var);
2378 offset -= (offset % fragP->fr_var);
2387 /* Assume .org is nugatory. It will grow with 1st relax. */
2394 case rs_machine_dependent:
2395 /* If fr_symbol is an expression, this call to
2396 resolve_symbol_value sets up the correct segment, which will
2397 likely be needed in md_estimate_size_before_relax. */
2398 if (fragP->fr_symbol)
2399 resolve_symbol_value (fragP->fr_symbol);
2401 address += md_estimate_size_before_relax (fragP, segment);
2404 #ifndef WORKING_DOT_WORD
2405 /* Broken words don't concern us yet. */
2406 case rs_broken_word:
2411 /* Initial guess is always 1; doing otherwise can result in
2412 stable solutions that are larger than the minimum. */
2413 address += fragP->fr_offset = 1;
2417 address += eh_frame_estimate_size_before_relax (fragP);
2421 address += dwarf2dbg_estimate_size_before_relax (fragP);
2425 BAD_CASE (fragP->fr_type);
2432 unsigned long max_iterations;
2434 /* Cumulative address adjustment. */
2437 /* Have we made any adjustment this pass? We can't just test
2438 stretch because one piece of code may have grown and another
2442 /* Most horrible, but gcc may give us some exception data that
2443 is impossible to assemble, of the form
2447 .uleb128 end - start
2453 If the leb128 is two bytes in size, then end-start is 128*128,
2454 which requires a three byte leb128. If the leb128 is three
2455 bytes in size, then end-start is 128*128-1, which requires a
2456 two byte leb128. We work around this dilemma by inserting
2457 an extra 4 bytes of alignment just after the .align. This
2458 works because the data after the align is accessed relative to
2461 This counter is used in a tiny state machine to detect
2462 whether a leb128 followed by an align is impossible to
2464 int rs_leb128_fudge = 0;
2466 /* We want to prevent going into an infinite loop where one frag grows
2467 depending upon the location of a symbol which is in turn moved by
2468 the growing frag. eg:
2474 So we dictate that this algorithm can be at most O2. */
2475 max_iterations = frag_count * frag_count;
2476 /* Check for overflow. */
2477 if (max_iterations < frag_count)
2478 max_iterations = frag_count;
2486 for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next)
2489 addressT was_address;
2493 fragP->relax_marker ^= 1;
2494 was_address = fragP->fr_address;
2495 address = fragP->fr_address += stretch;
2496 symbolP = fragP->fr_symbol;
2497 offset = fragP->fr_offset;
2499 switch (fragP->fr_type)
2501 case rs_fill: /* .fill never relaxes. */
2505 #ifndef WORKING_DOT_WORD
2506 /* JF: This is RMS's idea. I do *NOT* want to be blamed
2507 for it I do not want to write it. I do not want to have
2508 anything to do with it. This is not the proper way to
2509 implement this misfeature. */
2510 case rs_broken_word:
2512 struct broken_word *lie;
2513 struct broken_word *untruth;
2515 /* Yes this is ugly (storing the broken_word pointer
2516 in the symbol slot). Still, this whole chunk of
2517 code is ugly, and I don't feel like doing anything
2518 about it. Think of it as stubbornness in action. */
2520 for (lie = (struct broken_word *) (fragP->fr_symbol);
2521 lie && lie->dispfrag == fragP;
2522 lie = lie->next_broken_word)
2528 offset = (S_GET_VALUE (lie->add)
2530 - S_GET_VALUE (lie->sub));
2531 if (offset <= -32768 || offset >= 32767)
2533 if (flag_warn_displacement)
2536 sprint_value (buf, (addressT) lie->addnum);
2537 as_warn_where (fragP->fr_file, fragP->fr_line,
2538 _(".word %s-%s+%s didn't fit"),
2539 S_GET_NAME (lie->add),
2540 S_GET_NAME (lie->sub),
2543 if (fragP->fr_subtype == 0)
2545 fragP->fr_subtype++;
2546 growth += md_short_jump_size;
2549 /* Redirect *all* words of this table with the same
2550 target, lest we have to handle the case where the
2551 same target but with a offset that fits on this
2552 round overflows at the next relaxation round. */
2553 for (untruth = (struct broken_word *) (fragP->fr_symbol);
2554 untruth && untruth->dispfrag == lie->dispfrag;
2555 untruth = untruth->next_broken_word)
2556 if ((symbol_get_frag (untruth->add)
2557 == symbol_get_frag (lie->add))
2558 && (S_GET_VALUE (untruth->add)
2559 == S_GET_VALUE (lie->add)))
2562 untruth->use_jump = lie;
2566 growth += md_long_jump_size;
2571 } /* case rs_broken_word */
2577 addressT oldoff, newoff;
2579 oldoff = relax_align (was_address + fragP->fr_fix,
2581 newoff = relax_align (address + fragP->fr_fix,
2584 if (fragP->fr_subtype != 0)
2586 if (oldoff > fragP->fr_subtype)
2588 if (newoff > fragP->fr_subtype)
2592 growth = newoff - oldoff;
2594 /* If this align happens to follow a leb128 and
2595 we have determined that the leb128 is bouncing
2596 in size, then break the cycle by inserting an
2599 && (rs_leb128_fudge & 16) != 0
2600 && (rs_leb128_fudge & 15) >= 2)
2602 segment_info_type *seginfo = seg_info (segment);
2603 struct obstack *ob = &seginfo->frchainP->frch_obstack;
2606 newf = frag_alloc (ob);
2607 obstack_blank_fast (ob, fragP->fr_var);
2608 obstack_finish (ob);
2609 memcpy (newf, fragP, SIZEOF_STRUCT_FRAG);
2610 memcpy (newf->fr_literal,
2611 fragP->fr_literal + fragP->fr_fix,
2613 newf->fr_type = rs_fill;
2614 newf->fr_address = address + fragP->fr_fix + newoff;
2616 newf->fr_offset = (((offsetT) 1 << fragP->fr_offset)
2618 if (newf->fr_offset * newf->fr_var
2619 != (offsetT) 1 << fragP->fr_offset)
2621 newf->fr_offset = (offsetT) 1 << fragP->fr_offset;
2624 /* Include size of new frag in GROWTH. */
2625 growth += newf->fr_offset * newf->fr_var;
2626 /* Adjust the new frag address for the amount
2627 we'll add when we process the new frag. */
2628 newf->fr_address -= stretch + growth;
2629 newf->relax_marker ^= 1;
2630 fragP->fr_next = newf;
2632 as_warn (_("padding added"));
2640 addressT target = offset;
2645 /* Convert from an actual address to an octet offset
2646 into the section. Here it is assumed that the
2647 section's VMA is zero, and can omit subtracting it
2648 from the symbol's value to get the address offset. */
2649 know (S_GET_SEGMENT (symbolP)->vma == 0);
2650 target += S_GET_VALUE (symbolP) * OCTETS_PER_BYTE;
2653 know (fragP->fr_next);
2654 after = fragP->fr_next->fr_address + stretch;
2655 growth = target - after;
2660 /* Don't error on first few frag relax passes.
2661 The symbol might be an expression involving
2662 symbol values from other sections. If those
2663 sections have not yet been processed their
2664 frags will all have zero addresses, so we
2665 will calculate incorrect values for them. The
2666 number of passes we allow before giving an
2667 error is somewhat arbitrary. It should be at
2668 least one, with larger values requiring
2669 increasingly contrived dependencies between
2670 frags to trigger a false error. */
2673 /* Force another pass. */
2678 /* Growth may be negative, but variable part of frag
2679 cannot have fewer than 0 chars. That is, we can't
2681 as_bad_where (fragP->fr_file, fragP->fr_line,
2682 _("attempt to move .org backwards"));
2684 /* We've issued an error message. Change the
2685 frag to avoid cascading errors. */
2686 fragP->fr_type = rs_align;
2687 fragP->fr_subtype = 0;
2688 fragP->fr_offset = 0;
2689 fragP->fr_fix = after - address;
2700 amount = S_GET_VALUE (symbolP);
2701 if (S_GET_SEGMENT (symbolP) != absolute_section
2702 || S_IS_COMMON (symbolP)
2703 || ! S_IS_DEFINED (symbolP))
2705 as_bad_where (fragP->fr_file, fragP->fr_line,
2706 _(".space specifies non-absolute value"));
2707 /* Prevent repeat of this error message. */
2708 fragP->fr_symbol = 0;
2710 else if (amount < 0)
2712 /* Don't error on first few frag relax passes.
2713 See rs_org comment for a longer explanation. */
2720 as_warn_where (fragP->fr_file, fragP->fr_line,
2721 _(".space or .fill with negative value, ignored"));
2722 fragP->fr_symbol = 0;
2725 growth = (was_address + fragP->fr_fix + amount
2726 - fragP->fr_next->fr_address);
2730 case rs_machine_dependent:
2731 #ifdef md_relax_frag
2732 growth = md_relax_frag (segment, fragP, stretch);
2734 #ifdef TC_GENERIC_RELAX_TABLE
2735 /* The default way to relax a frag is to look through
2736 TC_GENERIC_RELAX_TABLE. */
2737 growth = relax_frag (segment, fragP, stretch);
2738 #endif /* TC_GENERIC_RELAX_TABLE */
2747 value = resolve_symbol_value (fragP->fr_symbol);
2748 size = sizeof_leb128 (value, fragP->fr_subtype);
2749 growth = size - fragP->fr_offset;
2750 fragP->fr_offset = size;
2755 growth = eh_frame_relax_frag (fragP);
2759 growth = dwarf2dbg_relax_frag (fragP);
2763 BAD_CASE (fragP->fr_type);
2770 if (fragP->fr_type == rs_leb128)
2771 rs_leb128_fudge += 16;
2772 else if (fragP->fr_type == rs_align
2773 && (rs_leb128_fudge & 16) != 0
2775 rs_leb128_fudge += 16;
2777 rs_leb128_fudge = 0;
2782 && (rs_leb128_fudge & 16) == 0
2783 && (rs_leb128_fudge & -16) != 0)
2784 rs_leb128_fudge += 1;
2786 rs_leb128_fudge = 0;
2788 /* Until nothing further to relax. */
2789 while (stretched && -- max_iterations);
2792 as_fatal (_("Infinite loop encountered whilst attempting to compute the addresses of symbols in section %s"),
2793 segment_name (segment));
2796 for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next)
2797 if (fragP->last_fr_address != fragP->fr_address)
2799 fragP->last_fr_address = fragP->fr_address;
2806 number_to_chars_bigendian (char *buf, valueT val, int n)
2812 buf[n] = val & 0xff;
2818 number_to_chars_littleendian (char *buf, valueT val, int n)
2824 *buf++ = val & 0xff;
2830 write_print_statistics (FILE *file)
2832 fprintf (file, "fixups: %d\n", n_fixups);
2835 /* For debugging. */
2836 extern int indent_level;
2839 print_fixup (fixS *fixp)
2842 fprintf (stderr, "fix ");
2843 fprintf_vma (stderr, (bfd_vma)((bfd_hostptr_t) fixp));
2844 fprintf (stderr, " %s:%d",fixp->fx_file, fixp->fx_line);
2846 fprintf (stderr, " pcrel");
2847 if (fixp->fx_pcrel_adjust)
2848 fprintf (stderr, " pcrel_adjust=%d", fixp->fx_pcrel_adjust);
2849 if (fixp->fx_im_disp)
2852 fprintf (stderr, " im_disp=%d", fixp->fx_im_disp);
2854 fprintf (stderr, " im_disp");
2858 fprintf (stderr, " tcbit");
2860 fprintf (stderr, " done");
2861 fprintf (stderr, "\n size=%d frag=", fixp->fx_size);
2862 fprintf_vma (stderr, (bfd_vma) ((bfd_hostptr_t) fixp->fx_frag));
2863 fprintf (stderr, " where=%ld offset=%lx addnumber=%lx",
2864 (long) fixp->fx_where,
2865 (unsigned long) fixp->fx_offset,
2866 (unsigned long) fixp->fx_addnumber);
2867 fprintf (stderr, "\n %s (%d)", bfd_get_reloc_code_name (fixp->fx_r_type),
2871 fprintf (stderr, "\n +<");
2872 print_symbol_value_1 (stderr, fixp->fx_addsy);
2873 fprintf (stderr, ">");
2877 fprintf (stderr, "\n -<");
2878 print_symbol_value_1 (stderr, fixp->fx_subsy);
2879 fprintf (stderr, ">");
2881 fprintf (stderr, "\n");
2882 #ifdef TC_FIX_DATA_PRINT
2883 TC_FIX_DATA_PRINT (stderr, fixp);