1 /* write.c - emit .o file
2 Copyright 1986, 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
3 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
4 Free Software Foundation, Inc.
6 This file is part of GAS, the GNU Assembler.
8 GAS is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GAS is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GAS; see the file COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
23 /* This thing should be set up to do byteordering correctly. But... */
28 #include "output-file.h"
29 #include "dwarf2dbg.h"
31 #ifndef TC_ADJUST_RELOC_COUNT
32 #define TC_ADJUST_RELOC_COUNT(FIX, COUNT)
35 #ifndef TC_FORCE_RELOCATION
36 #define TC_FORCE_RELOCATION(FIX) \
37 (generic_force_reloc (FIX))
40 #ifndef TC_FORCE_RELOCATION_ABS
41 #define TC_FORCE_RELOCATION_ABS(FIX) \
42 (TC_FORCE_RELOCATION (FIX))
45 #ifndef TC_FORCE_RELOCATION_LOCAL
46 #define TC_FORCE_RELOCATION_LOCAL(FIX) \
49 || TC_FORCE_RELOCATION (FIX))
52 #ifndef TC_FORCE_RELOCATION_SUB_SAME
53 #define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEG) \
57 #ifndef TC_FORCE_RELOCATION_SUB_ABS
58 #define TC_FORCE_RELOCATION_SUB_ABS(FIX) 0
61 #ifndef TC_FORCE_RELOCATION_SUB_LOCAL
63 #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX) 0
65 #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX) 1
69 #ifndef TC_VALIDATE_FIX_SUB
70 #ifdef UNDEFINED_DIFFERENCE_OK
71 /* The PA needs this for PIC code generation. */
72 #define TC_VALIDATE_FIX_SUB(FIX) 1
74 #define TC_VALIDATE_FIX_SUB(FIX) \
75 ((FIX)->fx_r_type == BFD_RELOC_GPREL32 \
76 || (FIX)->fx_r_type == BFD_RELOC_GPREL16)
80 #ifndef TC_LINKRELAX_FIXUP
81 #define TC_LINKRELAX_FIXUP(SEG) 1
84 #ifndef MD_APPLY_SYM_VALUE
85 #define MD_APPLY_SYM_VALUE(FIX) 1
88 #ifndef TC_FINALIZE_SYMS_BEFORE_SIZE_SEG
89 #define TC_FINALIZE_SYMS_BEFORE_SIZE_SEG 1
92 #ifndef MD_PCREL_FROM_SECTION
93 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from (FIX)
97 #define TC_FAKE_LABEL(NAME) (strcmp ((NAME), FAKE_LABEL_NAME) == 0)
100 /* Used to control final evaluation of expressions. */
101 int finalize_syms = 0;
103 int symbol_table_frozen;
105 symbolS *abs_section_sym;
107 /* Remember the value of dot when parsing expressions. */
110 void print_fixup (fixS *);
112 static void renumber_sections (bfd *, asection *, PTR);
114 /* We generally attach relocs to frag chains. However, after we have
115 chained these all together into a segment, any relocs we add after
116 that must be attached to a segment. This will include relocs added
117 in md_estimate_size_for_relax, for example. */
118 static int frags_chained = 0;
122 #define RELOC_ENUM enum bfd_reloc_code_real
124 static fixS *fix_new_internal (fragS *, int where, int size,
125 symbolS *add, symbolS *sub,
126 offsetT offset, int pcrel,
128 static long fixup_segment (fixS *, segT);
129 static relax_addressT relax_align (relax_addressT addr, int align);
130 static fragS *chain_frchains_together_1 (segT, struct frchain *);
131 static void chain_frchains_together (bfd *, segT, PTR);
132 static void cvt_frag_to_fill (segT, fragS *);
133 static void adjust_reloc_syms (bfd *, asection *, PTR);
134 static void fix_segment (bfd *, asection *, PTR);
135 static void write_relocs (bfd *, asection *, PTR);
136 static void write_contents (bfd *, asection *, PTR);
137 static void set_symtab (void);
138 static void merge_data_into_text (void);
140 /* Create a fixS in obstack 'notes'. */
143 fix_new_internal (fragS *frag, /* Which frag? */
144 int where, /* Where in that frag? */
145 int size, /* 1, 2, or 4 usually. */
146 symbolS *add_symbol, /* X_add_symbol. */
147 symbolS *sub_symbol, /* X_op_symbol. */
148 offsetT offset, /* X_add_number. */
149 int pcrel, /* TRUE if PC-relative relocation. */
150 RELOC_ENUM r_type ATTRIBUTE_UNUSED /* Relocation type. */)
156 fixP = (fixS *) obstack_alloc (¬es, sizeof (fixS));
158 fixP->fx_frag = frag;
159 fixP->fx_where = where;
160 fixP->fx_size = size;
161 /* We've made fx_size a narrow field; check that it's wide enough. */
162 if (fixP->fx_size != size)
164 as_bad (_("field fx_size too small to hold %d"), size);
167 fixP->fx_addsy = add_symbol;
168 fixP->fx_subsy = sub_symbol;
169 fixP->fx_offset = offset;
170 fixP->fx_dot_value = dot_value;
171 fixP->fx_pcrel = pcrel;
173 fixP->fx_r_type = r_type;
174 fixP->fx_im_disp = 0;
175 fixP->fx_pcrel_adjust = 0;
176 fixP->fx_bit_fixP = 0;
177 fixP->fx_addnumber = 0;
180 fixP->fx_no_overflow = 0;
184 fixP->fx_cgen.insn = NULL;
185 fixP->fx_cgen.opinfo = 0;
189 TC_INIT_FIX_DATA (fixP);
192 as_where (&fixP->fx_file, &fixP->fx_line);
194 /* Usually, we want relocs sorted numerically, but while
195 comparing to older versions of gas that have relocs
196 reverse sorted, it is convenient to have this compile
197 time option. xoxorich. */
200 fixS **seg_fix_rootP = (frags_chained
201 ? &seg_info (now_seg)->fix_root
202 : &frchain_now->fix_root);
203 fixS **seg_fix_tailP = (frags_chained
204 ? &seg_info (now_seg)->fix_tail
205 : &frchain_now->fix_tail);
207 #ifdef REVERSE_SORT_RELOCS
209 fixP->fx_next = *seg_fix_rootP;
210 *seg_fix_rootP = fixP;
212 #else /* REVERSE_SORT_RELOCS */
214 fixP->fx_next = NULL;
217 (*seg_fix_tailP)->fx_next = fixP;
219 *seg_fix_rootP = fixP;
220 *seg_fix_tailP = fixP;
222 #endif /* REVERSE_SORT_RELOCS */
228 /* Create a fixup relative to a symbol (plus a constant). */
231 fix_new (fragS *frag, /* Which frag? */
232 int where, /* Where in that frag? */
233 int size, /* 1, 2, or 4 usually. */
234 symbolS *add_symbol, /* X_add_symbol. */
235 offsetT offset, /* X_add_number. */
236 int pcrel, /* TRUE if PC-relative relocation. */
237 RELOC_ENUM r_type /* Relocation type. */)
239 return fix_new_internal (frag, where, size, add_symbol,
240 (symbolS *) NULL, offset, pcrel, r_type);
243 /* Create a fixup for an expression. Currently we only support fixups
244 for difference expressions. That is itself more than most object
245 file formats support anyhow. */
248 fix_new_exp (fragS *frag, /* Which frag? */
249 int where, /* Where in that frag? */
250 int size, /* 1, 2, or 4 usually. */
251 expressionS *exp, /* Expression. */
252 int pcrel, /* TRUE if PC-relative relocation. */
253 RELOC_ENUM r_type /* Relocation type. */)
265 as_bad (_("register value used as expression"));
269 /* This comes up when _GLOBAL_OFFSET_TABLE_+(.-L0) is read, if
270 the difference expression cannot immediately be reduced. */
272 symbolS *stmp = make_expr_symbol (exp);
274 exp->X_op = O_symbol;
275 exp->X_op_symbol = 0;
276 exp->X_add_symbol = stmp;
277 exp->X_add_number = 0;
279 return fix_new_exp (frag, where, size, exp, pcrel, r_type);
283 add = exp->X_add_symbol;
284 off = exp->X_add_number;
285 r_type = BFD_RELOC_RVA;
289 sub = exp->X_add_symbol;
290 off = exp->X_add_number;
294 sub = exp->X_op_symbol;
297 add = exp->X_add_symbol;
300 off = exp->X_add_number;
304 add = make_expr_symbol (exp);
308 return fix_new_internal (frag, where, size, add, sub, off, pcrel, r_type);
311 /* Generic function to determine whether a fixup requires a relocation. */
313 generic_force_reloc (fixS *fix)
315 if (fix->fx_r_type == BFD_RELOC_VTABLE_INHERIT
316 || fix->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
319 if (fix->fx_addsy == NULL)
322 return S_FORCE_RELOC (fix->fx_addsy, fix->fx_subsy == NULL);
325 /* Append a string onto another string, bumping the pointer along. */
327 append (char **charPP, char *fromP, unsigned long length)
329 /* Don't trust memcpy() of 0 chars. */
333 memcpy (*charPP, fromP, length);
337 /* This routine records the largest alignment seen for each segment.
338 If the beginning of the segment is aligned on the worst-case
339 boundary, all of the other alignments within it will work. At
340 least one object format really uses this info. */
343 record_alignment (/* Segment to which alignment pertains. */
345 /* Alignment, as a power of 2 (e.g., 1 => 2-byte
346 boundary, 2 => 4-byte boundary, etc.) */
349 if (seg == absolute_section)
352 if ((unsigned int) align > bfd_get_section_alignment (stdoutput, seg))
353 bfd_set_section_alignment (stdoutput, seg, align);
357 get_recorded_alignment (segT seg)
359 if (seg == absolute_section)
362 return bfd_get_section_alignment (stdoutput, seg);
365 /* Reset the section indices after removing the gas created sections. */
368 renumber_sections (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, PTR countparg)
370 int *countp = (int *) countparg;
372 sec->index = *countp;
377 chain_frchains_together_1 (segT section, struct frchain *frchp)
379 fragS dummy, *prev_frag = &dummy;
380 fixS fix_dummy, *prev_fix = &fix_dummy;
382 for (; frchp && frchp->frch_seg == section; frchp = frchp->frch_next)
384 prev_frag->fr_next = frchp->frch_root;
385 prev_frag = frchp->frch_last;
386 assert (prev_frag->fr_type != 0);
387 if (frchp->fix_root != (fixS *) NULL)
389 if (seg_info (section)->fix_root == (fixS *) NULL)
390 seg_info (section)->fix_root = frchp->fix_root;
391 prev_fix->fx_next = frchp->fix_root;
392 seg_info (section)->fix_tail = frchp->fix_tail;
393 prev_fix = frchp->fix_tail;
396 assert (prev_frag->fr_type != 0);
397 prev_frag->fr_next = 0;
402 chain_frchains_together (bfd *abfd ATTRIBUTE_UNUSED,
404 PTR xxx ATTRIBUTE_UNUSED)
406 segment_info_type *info;
408 /* BFD may have introduced its own sections without using
409 subseg_new, so it is possible that seg_info is NULL. */
410 info = seg_info (section);
411 if (info != (segment_info_type *) NULL)
412 info->frchainP->frch_last
413 = chain_frchains_together_1 (section, info->frchainP);
415 /* Now that we've chained the frags together, we must add new fixups
416 to the segment, not to the frag chain. */
421 cvt_frag_to_fill (segT sec ATTRIBUTE_UNUSED, fragS *fragP)
423 switch (fragP->fr_type)
431 HANDLE_ALIGN (fragP);
433 know (fragP->fr_next != NULL);
434 fragP->fr_offset = (fragP->fr_next->fr_address
436 - fragP->fr_fix) / fragP->fr_var;
437 if (fragP->fr_offset < 0)
439 as_bad_where (fragP->fr_file, fragP->fr_line,
440 _("attempt to .org/.space backwards? (%ld)"),
441 (long) fragP->fr_offset);
442 fragP->fr_offset = 0;
444 fragP->fr_type = rs_fill;
452 valueT value = S_GET_VALUE (fragP->fr_symbol);
455 size = output_leb128 (fragP->fr_literal + fragP->fr_fix, value,
458 fragP->fr_fix += size;
459 fragP->fr_type = rs_fill;
461 fragP->fr_offset = 0;
462 fragP->fr_symbol = NULL;
467 eh_frame_convert_frag (fragP);
471 dwarf2dbg_convert_frag (fragP);
474 case rs_machine_dependent:
475 md_convert_frag (stdoutput, sec, fragP);
477 assert (fragP->fr_next == NULL
478 || ((offsetT) (fragP->fr_next->fr_address - fragP->fr_address)
481 /* After md_convert_frag, we make the frag into a ".space 0".
482 md_convert_frag() should set up any fixSs and constants
487 #ifndef WORKING_DOT_WORD
490 struct broken_word *lie;
492 if (fragP->fr_subtype)
494 fragP->fr_fix += md_short_jump_size;
495 for (lie = (struct broken_word *) (fragP->fr_symbol);
496 lie && lie->dispfrag == fragP;
497 lie = lie->next_broken_word)
499 fragP->fr_fix += md_long_jump_size;
507 BAD_CASE (fragP->fr_type);
511 md_frag_check (fragP);
515 static void relax_seg (bfd *, asection *, PTR);
518 relax_seg (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, PTR xxx)
520 segment_info_type *seginfo = seg_info (sec);
522 if (seginfo && seginfo->frchainP
523 && relax_segment (seginfo->frchainP->frch_root, sec))
525 int *result = (int *) xxx;
530 static void size_seg (bfd *, asection *, PTR);
533 size_seg (bfd *abfd, asection *sec, PTR xxx ATTRIBUTE_UNUSED)
537 segment_info_type *seginfo;
539 valueT size, newsize;
541 subseg_change (sec, 0);
543 seginfo = seg_info (sec);
544 if (seginfo && seginfo->frchainP)
546 for (fragp = seginfo->frchainP->frch_root; fragp; fragp = fragp->fr_next)
547 cvt_frag_to_fill (sec, fragp);
548 for (fragp = seginfo->frchainP->frch_root;
550 fragp = fragp->fr_next)
551 /* Walk to last elt. */
553 size = fragp->fr_address + fragp->fr_fix;
558 flags = bfd_get_section_flags (abfd, sec);
560 if (size > 0 && ! seginfo->bss)
561 flags |= SEC_HAS_CONTENTS;
563 /* @@ This is just an approximation. */
564 if (seginfo && seginfo->fix_root)
568 x = bfd_set_section_flags (abfd, sec, flags);
571 newsize = md_section_align (sec, size);
572 x = bfd_set_section_size (abfd, sec, newsize);
575 /* If the size had to be rounded up, add some padding in the last
577 assert (newsize >= size);
580 fragS *last = seginfo->frchainP->frch_last;
581 fragp = seginfo->frchainP->frch_root;
582 while (fragp->fr_next != last)
583 fragp = fragp->fr_next;
584 last->fr_address = size;
585 if ((newsize - size) % fragp->fr_var == 0)
586 fragp->fr_offset += (newsize - size) / fragp->fr_var;
588 /* If we hit this abort, it's likely due to subsegs_finish not
589 providing sufficient alignment on the last frag, and the
590 machine dependent code using alignment frags with fr_var
595 #ifdef tc_frob_section
596 tc_frob_section (sec);
598 #ifdef obj_frob_section
599 obj_frob_section (sec);
605 dump_section_relocs (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, FILE *stream)
607 segment_info_type *seginfo = seg_info (sec);
608 fixS *fixp = seginfo->fix_root;
613 fprintf (stream, "sec %s relocs:\n", sec->name);
616 symbolS *s = fixp->fx_addsy;
618 fprintf (stream, " %08lx: type %d ", (unsigned long) fixp,
619 (int) fixp->fx_r_type);
621 fprintf (stream, "no sym\n");
624 print_symbol_value_1 (stream, s);
625 fprintf (stream, "\n");
627 fixp = fixp->fx_next;
631 #define dump_section_relocs(ABFD,SEC,STREAM) ((void) 0)
634 #ifndef EMIT_SECTION_SYMBOLS
635 #define EMIT_SECTION_SYMBOLS 1
638 /* This pass over fixups decides whether symbols can be replaced with
642 adjust_reloc_syms (bfd *abfd ATTRIBUTE_UNUSED,
644 PTR xxx ATTRIBUTE_UNUSED)
646 segment_info_type *seginfo = seg_info (sec);
652 dump_section_relocs (abfd, sec, stderr);
654 for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next)
658 else if (fixp->fx_addsy)
664 fprintf (stderr, "\n\nadjusting fixup:\n");
668 sym = fixp->fx_addsy;
670 /* All symbols should have already been resolved at this
671 point. It is possible to see unresolved expression
672 symbols, though, since they are not in the regular symbol
674 resolve_symbol_value (sym);
676 if (fixp->fx_subsy != NULL)
677 resolve_symbol_value (fixp->fx_subsy);
679 /* If this symbol is equated to an undefined or common symbol,
680 convert the fixup to being against that symbol. */
681 if (symbol_equated_reloc_p (sym)
682 || S_IS_WEAKREFR (sym))
684 fixp->fx_offset += symbol_get_value_expression (sym)->X_add_number;
685 sym = symbol_get_value_expression (sym)->X_add_symbol;
686 fixp->fx_addsy = sym;
689 if (symbol_mri_common_p (sym))
691 /* These symbols are handled specially in fixup_segment. */
695 /* If the symbol is undefined, common, weak, or global (ELF
696 shared libs), we can't replace it with the section symbol. */
697 if (S_FORCE_RELOC (fixp->fx_addsy, 1))
700 /* Is there some other (target cpu dependent) reason we can't adjust
701 this one? (E.g. relocations involving function addresses on
703 #ifdef tc_fix_adjustable
704 if (! tc_fix_adjustable (fixp))
708 /* Since we're reducing to section symbols, don't attempt to reduce
709 anything that's already using one. */
710 if (symbol_section_p (sym))
713 symsec = S_GET_SEGMENT (sym);
717 if (bfd_is_abs_section (symsec))
719 /* The fixup_segment routine normally will not use this
720 symbol in a relocation. */
724 /* Don't try to reduce relocs which refer to non-local symbols
725 in .linkonce sections. It can lead to confusion when a
726 debugging section refers to a .linkonce section. I hope
727 this will always be correct. */
728 if (symsec != sec && ! S_IS_LOCAL (sym))
730 if ((symsec->flags & SEC_LINK_ONCE) != 0
732 /* The GNU toolchain uses an extension for ELF: a
733 section beginning with the magic string
734 .gnu.linkonce is a linkonce section. */
735 && strncmp (segment_name (symsec), ".gnu.linkonce",
736 sizeof ".gnu.linkonce" - 1) == 0))
740 /* Never adjust a reloc against local symbol in a merge section
741 with non-zero addend. */
742 if ((symsec->flags & SEC_MERGE) != 0
743 && (fixp->fx_offset != 0 || fixp->fx_subsy != NULL))
746 /* Never adjust a reloc against TLS local symbol. */
747 if ((symsec->flags & SEC_THREAD_LOCAL) != 0)
750 /* We refetch the segment when calling section_symbol, rather
751 than using symsec, because S_GET_VALUE may wind up changing
752 the section when it calls resolve_symbol_value. */
753 fixp->fx_offset += S_GET_VALUE (sym);
754 fixp->fx_addsy = section_symbol (S_GET_SEGMENT (sym));
756 fprintf (stderr, "\nadjusted fixup:\n");
761 dump_section_relocs (abfd, sec, stderr);
765 fix_segment (bfd *abfd ATTRIBUTE_UNUSED,
767 PTR xxx ATTRIBUTE_UNUSED)
769 segment_info_type *seginfo = seg_info (sec);
771 fixup_segment (seginfo->fix_root, sec);
775 write_relocs (bfd *abfd, asection *sec, PTR xxx ATTRIBUTE_UNUSED)
777 segment_info_type *seginfo = seg_info (sec);
784 /* If seginfo is NULL, we did not create this section; don't do
790 for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next)
793 #ifndef RELOC_EXPANSION_POSSIBLE
794 /* Set up reloc information as well. */
795 relocs = (arelent **) xcalloc (n, sizeof (arelent *));
798 for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next)
801 bfd_reloc_status_type s;
810 /* If this is an undefined symbol which was equated to another
811 symbol, then generate the reloc against the latter symbol
812 rather than the former. */
813 sym = fixp->fx_addsy;
814 while (symbol_equated_reloc_p (sym))
818 /* We must avoid looping, as that can occur with a badly
820 n = symbol_get_value_expression (sym)->X_add_symbol;
823 fixp->fx_offset += symbol_get_value_expression (sym)->X_add_number;
826 fixp->fx_addsy = sym;
828 reloc = tc_gen_reloc (sec, fixp);
836 This test is triggered inappropriately for the SH:
837 if (fixp->fx_where + fixp->fx_size
838 > fixp->fx_frag->fr_fix + fixp->fx_frag->fr_offset)
842 s = bfd_install_relocation (stdoutput, reloc,
843 fixp->fx_frag->fr_literal,
844 fixp->fx_frag->fr_address,
850 case bfd_reloc_overflow:
851 as_bad_where (fixp->fx_file, fixp->fx_line,
852 _("relocation overflow"));
854 case bfd_reloc_outofrange:
855 as_bad_where (fixp->fx_file, fixp->fx_line,
856 _("relocation out of range"));
859 as_fatal (_("%s:%u: bad return from bfd_install_relocation: %x"),
860 fixp->fx_file, fixp->fx_line, s);
865 n = n * MAX_RELOC_EXPANSION;
866 /* Set up reloc information as well. */
867 relocs = (arelent **) xcalloc (n, sizeof (arelent *));
870 for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next)
873 bfd_reloc_status_type s;
883 /* If this is an undefined symbol which was equated to another
884 symbol, then generate the reloc against the latter symbol
885 rather than the former. */
886 sym = fixp->fx_addsy;
887 while (symbol_equated_reloc_p (sym))
891 /* We must avoid looping, as that can occur with a badly
893 n = symbol_get_value_expression (sym)->X_add_symbol;
896 fixp->fx_offset += symbol_get_value_expression (sym)->X_add_number;
899 fixp->fx_addsy = sym;
901 reloc = tc_gen_reloc (sec, fixp);
903 for (j = 0; reloc[j]; j++)
905 relocs[i++] = reloc[j];
908 if (fixp->fx_where + fixp->fx_size
909 > fixp->fx_frag->fr_fix + fixp->fx_frag->fr_offset)
910 as_bad_where (fixp->fx_file, fixp->fx_line,
911 _("internal error: fixup not contained within frag"));
912 for (j = 0; reloc[j]; j++)
914 s = bfd_install_relocation (stdoutput, reloc[j],
915 fixp->fx_frag->fr_literal,
916 fixp->fx_frag->fr_address,
922 case bfd_reloc_overflow:
923 as_bad_where (fixp->fx_file, fixp->fx_line,
924 _("relocation overflow"));
926 case bfd_reloc_outofrange:
927 as_bad_where (fixp->fx_file, fixp->fx_line,
928 _("relocation out of range"));
931 as_fatal (_("%s:%u: bad return from bfd_install_relocation: %x"),
932 fixp->fx_file, fixp->fx_line, s);
941 unsigned int i, j, nsyms;
943 sympp = bfd_get_outsymbols (stdoutput);
944 nsyms = bfd_get_symcount (stdoutput);
945 for (i = 0; i < n; i++)
946 if (((*relocs[i]->sym_ptr_ptr)->flags & BSF_SECTION_SYM) == 0)
948 for (j = 0; j < nsyms; j++)
949 if (sympp[j] == *relocs[i]->sym_ptr_ptr)
958 bfd_set_reloc (stdoutput, sec, relocs, n);
960 bfd_set_section_flags (abfd, sec,
961 (bfd_get_section_flags (abfd, sec)
962 & (flagword) ~SEC_RELOC));
964 #ifdef SET_SECTION_RELOCS
965 SET_SECTION_RELOCS (sec, relocs, n);
973 fprintf (stderr, "relocs for sec %s\n", sec->name);
974 for (i = 0; i < n; i++)
978 fprintf (stderr, " reloc %2d @%p off %4lx : sym %-10s addend %lx\n",
979 i, r, (unsigned long)r->address, s->name, (unsigned long)r->addend);
986 write_contents (bfd *abfd ATTRIBUTE_UNUSED,
988 PTR xxx ATTRIBUTE_UNUSED)
990 segment_info_type *seginfo = seg_info (sec);
994 /* Write out the frags. */
996 || !(bfd_get_section_flags (abfd, sec) & SEC_HAS_CONTENTS))
999 for (f = seginfo->frchainP->frch_root;
1008 assert (f->fr_type == rs_fill);
1011 x = bfd_set_section_contents (stdoutput, sec,
1012 f->fr_literal, (file_ptr) offset,
1013 (bfd_size_type) f->fr_fix);
1016 bfd_perror (stdoutput->filename);
1017 as_perror (_("FATAL: Can't write %s"), stdoutput->filename);
1018 exit (EXIT_FAILURE);
1020 offset += f->fr_fix;
1022 fill_literal = f->fr_literal + f->fr_fix;
1023 fill_size = f->fr_var;
1024 count = f->fr_offset;
1025 assert (count >= 0);
1026 if (fill_size && count)
1029 if (fill_size > sizeof (buf))
1031 /* Do it the old way. Can this ever happen? */
1034 x = bfd_set_section_contents (stdoutput, sec,
1037 (bfd_size_type) fill_size);
1040 bfd_perror (stdoutput->filename);
1041 as_perror (_("FATAL: Can't write %s"),
1042 stdoutput->filename);
1043 exit (EXIT_FAILURE);
1045 offset += fill_size;
1050 /* Build a buffer full of fill objects and output it as
1051 often as necessary. This saves on the overhead of
1052 potentially lots of bfd_set_section_contents calls. */
1056 n_per_buf = sizeof (buf);
1057 memset (buf, *fill_literal, n_per_buf);
1062 n_per_buf = sizeof (buf) / fill_size;
1063 for (i = n_per_buf, bufp = buf; i; i--, bufp += fill_size)
1064 memcpy (bufp, fill_literal, fill_size);
1066 for (; count > 0; count -= n_per_buf)
1068 n_per_buf = n_per_buf > count ? count : n_per_buf;
1069 x = bfd_set_section_contents
1070 (stdoutput, sec, buf, (file_ptr) offset,
1071 (bfd_size_type) n_per_buf * fill_size);
1073 as_fatal (_("cannot write to output file"));
1074 offset += n_per_buf * fill_size;
1082 merge_data_into_text (void)
1084 seg_info (text_section)->frchainP->frch_last->fr_next =
1085 seg_info (data_section)->frchainP->frch_root;
1086 seg_info (text_section)->frchainP->frch_last =
1087 seg_info (data_section)->frchainP->frch_last;
1088 seg_info (data_section)->frchainP = 0;
1098 extern PTR bfd_alloc (bfd *, bfd_size_type);
1100 /* Count symbols. We can't rely on a count made by the loop in
1101 write_object_file, because *_frob_file may add a new symbol or
1104 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
1110 bfd_size_type amt = (bfd_size_type) nsyms * sizeof (asymbol *);
1112 asympp = (asymbol **) bfd_alloc (stdoutput, amt);
1113 symp = symbol_rootP;
1114 for (i = 0; i < nsyms; i++, symp = symbol_next (symp))
1116 asympp[i] = symbol_get_bfdsym (symp);
1117 symbol_mark_written (symp);
1122 result = bfd_set_symtab (stdoutput, asympp, nsyms);
1124 symbol_table_frozen = 1;
1127 /* Finish the subsegments. After every sub-segment, we fake an
1128 ".align ...". This conforms to BSD4.2 brane-damage. We then fake
1129 ".fill 0" because that is the kind of frag that requires least
1130 thought. ".align" frags like to have a following frag since that
1131 makes calculating their intended length trivial. */
1133 #ifndef SUB_SEGMENT_ALIGN
1135 /* The last subsegment gets an alignment corresponding to the alignment
1136 of the section. This allows proper nop-filling at the end of
1137 code-bearing sections. */
1138 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) \
1139 (!(FRCHAIN)->frch_next || (FRCHAIN)->frch_next->frch_seg != (SEG) \
1140 ? get_recorded_alignment (SEG) : 0)
1142 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) 0
1147 subsegs_finish (void)
1149 struct frchain *frchainP;
1151 for (frchainP = frchain_root; frchainP; frchainP = frchainP->frch_next)
1155 subseg_set (frchainP->frch_seg, frchainP->frch_subseg);
1157 /* This now gets called even if we had errors. In that case,
1158 any alignment is meaningless, and, moreover, will look weird
1159 if we are generating a listing. */
1162 alignment = SUB_SEGMENT_ALIGN (now_seg, frchainP);
1163 if ((bfd_get_section_flags (now_seg->owner, now_seg) & SEC_MERGE)
1164 && now_seg->entsize)
1166 unsigned int entsize = now_seg->entsize;
1169 while ((entsize & 1) == 0)
1174 if (entalign > alignment)
1175 alignment = entalign;
1179 if (subseg_text_p (now_seg))
1180 frag_align_code (alignment, 0);
1182 frag_align (alignment, 0, 0);
1184 /* frag_align will have left a new frag.
1185 Use this last frag for an empty ".fill".
1187 For this segment ...
1188 Create a last frag. Do not leave a "being filled in frag". */
1189 frag_wane (frag_now);
1190 frag_now->fr_fix = 0;
1191 know (frag_now->fr_next == NULL);
1195 /* Write the object file. */
1198 write_object_file (void)
1200 #ifndef WORKING_DOT_WORD
1201 fragS *fragP; /* Track along all frags. */
1204 /* Do we really want to write it? */
1206 int n_warns, n_errs;
1207 n_warns = had_warnings ();
1208 n_errs = had_errors ();
1209 /* The -Z flag indicates that an object file should be generated,
1210 regardless of warnings and errors. */
1211 if (flag_always_generate_output)
1213 if (n_warns || n_errs)
1214 as_warn (_("%d error%s, %d warning%s, generating bad object file"),
1215 n_errs, n_errs == 1 ? "" : "s",
1216 n_warns, n_warns == 1 ? "" : "s");
1221 as_fatal (_("%d error%s, %d warning%s, no object file generated"),
1222 n_errs, n_errs == 1 ? "" : "s",
1223 n_warns, n_warns == 1 ? "" : "s");
1228 /* Under VMS we try to be compatible with VAX-11 "C". Thus, we call
1229 a routine to check for the definition of the procedure "_main",
1230 and if so -- fix it up so that it can be program entry point. */
1231 vms_check_for_main ();
1232 #endif /* OBJ_VMS */
1234 /* From now on, we don't care about sub-segments. Build one frag chain
1235 for each segment. Linked thru fr_next. */
1237 /* Remove the sections created by gas for its own purposes. */
1241 bfd_section_list_remove (stdoutput, reg_section);
1242 bfd_section_list_remove (stdoutput, expr_section);
1243 stdoutput->section_count -= 2;
1245 bfd_map_over_sections (stdoutput, renumber_sections, &i);
1248 bfd_map_over_sections (stdoutput, chain_frchains_together, (char *) 0);
1250 /* We have two segments. If user gave -R flag, then we must put the
1251 data frags into the text segment. Do this before relaxing so
1252 we know to take advantage of -R and make shorter addresses. */
1253 if (flag_readonly_data_in_text)
1255 merge_data_into_text ();
1262 #ifndef WORKING_DOT_WORD
1263 /* We need to reset the markers in the broken word list and
1264 associated frags between calls to relax_segment (via
1265 relax_seg). Since the broken word list is global, we do it
1266 once per round, rather than locally in relax_segment for each
1268 struct broken_word *brokp;
1270 for (brokp = broken_words;
1271 brokp != (struct broken_word *) NULL;
1272 brokp = brokp->next_broken_word)
1276 if (brokp->dispfrag != (fragS *) NULL
1277 && brokp->dispfrag->fr_type == rs_broken_word)
1278 brokp->dispfrag->fr_subtype = 0;
1283 bfd_map_over_sections (stdoutput, relax_seg, &changed);
1288 /* Note - Most ports will use the default value of
1289 TC_FINALIZE_SYMS_BEFORE_SIZE_SEG, which 1. This will force
1290 local symbols to be resolved, removing their frag information.
1291 Some ports however, will not have finished relaxing all of
1292 their frags and will still need the local symbol frag
1293 information. These ports can set
1294 TC_FINALIZE_SYMS_BEFORE_SIZE_SEG to 0. */
1295 finalize_syms = TC_FINALIZE_SYMS_BEFORE_SIZE_SEG;
1297 bfd_map_over_sections (stdoutput, size_seg, (char *) 0);
1299 /* Relaxation has completed. Freeze all syms. */
1302 #ifdef md_post_relax_hook
1306 #ifndef WORKING_DOT_WORD
1308 struct broken_word *lie;
1309 struct broken_word **prevP;
1311 prevP = &broken_words;
1312 for (lie = broken_words; lie; lie = lie->next_broken_word)
1317 subseg_change (lie->seg, lie->subseg);
1318 exp.X_op = O_subtract;
1319 exp.X_add_symbol = lie->add;
1320 exp.X_op_symbol = lie->sub;
1321 exp.X_add_number = lie->addnum;
1322 #ifdef TC_CONS_FIX_NEW
1323 TC_CONS_FIX_NEW (lie->frag,
1324 lie->word_goes_here - lie->frag->fr_literal,
1327 fix_new_exp (lie->frag,
1328 lie->word_goes_here - lie->frag->fr_literal,
1329 2, &exp, 0, BFD_RELOC_16);
1331 *prevP = lie->next_broken_word;
1334 prevP = &(lie->next_broken_word);
1336 for (lie = broken_words; lie;)
1338 struct broken_word *untruth;
1340 addressT table_addr;
1341 addressT from_addr, to_addr;
1344 subseg_change (lie->seg, lie->subseg);
1345 fragP = lie->dispfrag;
1347 /* Find out how many broken_words go here. */
1350 untruth && untruth->dispfrag == fragP;
1351 untruth = untruth->next_broken_word)
1352 if (untruth->added == 1)
1355 table_ptr = lie->dispfrag->fr_opcode;
1356 table_addr = (lie->dispfrag->fr_address
1357 + (table_ptr - lie->dispfrag->fr_literal));
1358 /* Create the jump around the long jumps. This is a short
1359 jump from table_ptr+0 to table_ptr+n*long_jump_size. */
1360 from_addr = table_addr;
1361 to_addr = table_addr + md_short_jump_size + n * md_long_jump_size;
1362 md_create_short_jump (table_ptr, from_addr, to_addr, lie->dispfrag,
1364 table_ptr += md_short_jump_size;
1365 table_addr += md_short_jump_size;
1368 lie && lie->dispfrag == fragP;
1369 m++, lie = lie->next_broken_word)
1371 if (lie->added == 2)
1373 /* Patch the jump table. */
1374 /* This is the offset from ??? to table_ptr+0. */
1375 to_addr = table_addr - S_GET_VALUE (lie->sub);
1376 #ifdef TC_CHECK_ADJUSTED_BROKEN_DOT_WORD
1377 TC_CHECK_ADJUSTED_BROKEN_DOT_WORD (to_addr, lie);
1379 md_number_to_chars (lie->word_goes_here, to_addr, 2);
1380 for (untruth = lie->next_broken_word;
1381 untruth && untruth->dispfrag == fragP;
1382 untruth = untruth->next_broken_word)
1384 if (untruth->use_jump == lie)
1385 md_number_to_chars (untruth->word_goes_here, to_addr, 2);
1388 /* Install the long jump. */
1389 /* This is a long jump from table_ptr+0 to the final target. */
1390 from_addr = table_addr;
1391 to_addr = S_GET_VALUE (lie->add) + lie->addnum;
1392 md_create_long_jump (table_ptr, from_addr, to_addr, lie->dispfrag,
1394 table_ptr += md_long_jump_size;
1395 table_addr += md_long_jump_size;
1399 #endif /* not WORKING_DOT_WORD */
1401 /* Resolve symbol values. This needs to be done before processing
1407 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
1408 resolve_symbol_value (symp);
1410 resolve_local_symbol_values ();
1414 #ifdef tc_frob_file_before_adjust
1415 tc_frob_file_before_adjust ();
1417 #ifdef obj_frob_file_before_adjust
1418 obj_frob_file_before_adjust ();
1421 bfd_map_over_sections (stdoutput, adjust_reloc_syms, (char *) 0);
1423 #ifdef tc_frob_file_before_fix
1424 tc_frob_file_before_fix ();
1426 #ifdef obj_frob_file_before_fix
1427 obj_frob_file_before_fix ();
1430 bfd_map_over_sections (stdoutput, fix_segment, (char *) 0);
1432 /* Set up symbol table, and write it out. */
1436 bfd_boolean skip_next_symbol = FALSE;
1438 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
1443 if (skip_next_symbol)
1445 /* Don't do anything besides moving the value of the
1446 symbol from the GAS value-field to the BFD value-field. */
1447 symbol_get_bfdsym (symp)->value = S_GET_VALUE (symp);
1448 skip_next_symbol = FALSE;
1452 if (symbol_mri_common_p (symp))
1454 if (S_IS_EXTERNAL (symp))
1455 as_bad (_("%s: global symbols not supported in common sections"),
1457 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
1461 name = S_GET_NAME (symp);
1465 decode_local_label_name ((char *) S_GET_NAME (symp));
1466 /* They only differ if `name' is a fb or dollar local
1468 if (name2 != name && ! S_IS_DEFINED (symp))
1469 as_bad (_("local label `%s' is not defined"), name2);
1472 /* Do it again, because adjust_reloc_syms might introduce
1473 more symbols. They'll probably only be section symbols,
1474 but they'll still need to have the values computed. */
1475 resolve_symbol_value (symp);
1477 /* Skip symbols which were equated to undefined or common
1479 if (symbol_equated_reloc_p (symp)
1480 || S_IS_WEAKREFR (symp))
1482 const char *name = S_GET_NAME (symp);
1483 if (S_IS_COMMON (symp)
1484 && !TC_FAKE_LABEL (name)
1485 && !S_IS_WEAKREFR (symp)
1486 && (!S_IS_EXTERNAL (symp) || S_IS_LOCAL (symp)))
1488 expressionS *e = symbol_get_value_expression (symp);
1489 as_bad (_("Local symbol `%s' can't be equated to common symbol `%s'"),
1490 name, S_GET_NAME (e->X_add_symbol));
1492 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
1496 /* So far, common symbols have been treated like undefined symbols.
1497 Put them in the common section now. */
1498 if (S_IS_DEFINED (symp) == 0
1499 && S_GET_VALUE (symp) != 0)
1500 S_SET_SEGMENT (symp, bfd_com_section_ptr);
1502 #ifdef obj_frob_symbol
1503 obj_frob_symbol (symp, punt);
1505 #ifdef tc_frob_symbol
1506 if (! punt || symbol_used_in_reloc_p (symp))
1507 tc_frob_symbol (symp, punt);
1510 /* If we don't want to keep this symbol, splice it out of
1511 the chain now. If EMIT_SECTION_SYMBOLS is 0, we never
1512 want section symbols. Otherwise, we skip local symbols
1513 and symbols that the frob_symbol macros told us to punt,
1514 but we keep such symbols if they are used in relocs. */
1515 if (symp == abs_section_sym
1516 || (! EMIT_SECTION_SYMBOLS
1517 && symbol_section_p (symp))
1518 /* Note that S_IS_EXTERNAL and S_IS_LOCAL are not always
1519 opposites. Sometimes the former checks flags and the
1520 latter examines the name... */
1521 || (!S_IS_EXTERNAL (symp)
1522 && (punt || S_IS_LOCAL (symp) || S_IS_WEAKREFD (symp))
1523 && ! symbol_used_in_reloc_p (symp)))
1525 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
1527 /* After symbol_remove, symbol_next(symp) still returns
1528 the one that came after it in the chain. So we don't
1529 need to do any extra cleanup work here. */
1533 /* Make sure we really got a value for the symbol. */
1534 if (! symbol_resolved_p (symp))
1536 as_bad (_("can't resolve value for symbol `%s'"),
1538 symbol_mark_resolved (symp);
1541 /* Set the value into the BFD symbol. Up til now the value
1542 has only been kept in the gas symbolS struct. */
1543 symbol_get_bfdsym (symp)->value = S_GET_VALUE (symp);
1545 /* A warning construct is a warning symbol followed by the
1546 symbol warned about. Don't let anything object-format or
1547 target-specific muck with it; it's ready for output. */
1548 if (symbol_get_bfdsym (symp)->flags & BSF_WARNING)
1549 skip_next_symbol = TRUE;
1555 /* Now do any format-specific adjustments to the symbol table, such
1556 as adding file symbols. */
1557 #ifdef tc_adjust_symtab
1558 tc_adjust_symtab ();
1560 #ifdef obj_adjust_symtab
1561 obj_adjust_symtab ();
1564 /* Now that all the sizes are known, and contents correct, we can
1565 start writing to the file. */
1568 /* If *_frob_file changes the symbol value at this point, it is
1569 responsible for moving the changed value into symp->bsym->value
1570 as well. Hopefully all symbol value changing can be done in
1575 #ifdef obj_frob_file
1579 bfd_map_over_sections (stdoutput, write_relocs, (char *) 0);
1581 #ifdef tc_frob_file_after_relocs
1582 tc_frob_file_after_relocs ();
1584 #ifdef obj_frob_file_after_relocs
1585 obj_frob_file_after_relocs ();
1588 bfd_map_over_sections (stdoutput, write_contents, (char *) 0);
1591 #ifdef TC_GENERIC_RELAX_TABLE
1592 /* Relax a fragment by scanning TC_GENERIC_RELAX_TABLE. */
1595 relax_frag (segT segment, fragS *fragP, long stretch)
1597 const relax_typeS *this_type;
1598 const relax_typeS *start_type;
1599 relax_substateT next_state;
1600 relax_substateT this_state;
1606 const relax_typeS *table;
1608 target = fragP->fr_offset;
1609 address = fragP->fr_address;
1610 table = TC_GENERIC_RELAX_TABLE;
1611 this_state = fragP->fr_subtype;
1612 start_type = this_type = table + this_state;
1613 symbolP = fragP->fr_symbol;
1619 sym_frag = symbol_get_frag (symbolP);
1621 #ifndef DIFF_EXPR_OK
1622 know (sym_frag != NULL);
1624 know (S_GET_SEGMENT (symbolP) != absolute_section
1625 || sym_frag == &zero_address_frag);
1626 target += S_GET_VALUE (symbolP);
1628 /* If frag has yet to be reached on this pass,
1629 assume it will move by STRETCH just as we did.
1630 If this is not so, it will be because some frag
1631 between grows, and that will force another pass. */
1634 && sym_frag->relax_marker != fragP->relax_marker
1635 && S_GET_SEGMENT (symbolP) == segment)
1641 aim = target - address - fragP->fr_fix;
1642 #ifdef TC_PCREL_ADJUST
1643 /* Currently only the ns32k family needs this. */
1644 aim += TC_PCREL_ADJUST (fragP);
1647 #ifdef md_prepare_relax_scan
1648 /* Formerly called M68K_AIM_KLUDGE. */
1649 md_prepare_relax_scan (fragP, address, aim, this_state, this_type);
1654 /* Look backwards. */
1655 for (next_state = this_type->rlx_more; next_state;)
1656 if (aim >= this_type->rlx_backward)
1660 /* Grow to next state. */
1661 this_state = next_state;
1662 this_type = table + this_state;
1663 next_state = this_type->rlx_more;
1668 /* Look forwards. */
1669 for (next_state = this_type->rlx_more; next_state;)
1670 if (aim <= this_type->rlx_forward)
1674 /* Grow to next state. */
1675 this_state = next_state;
1676 this_type = table + this_state;
1677 next_state = this_type->rlx_more;
1681 growth = this_type->rlx_length - start_type->rlx_length;
1683 fragP->fr_subtype = this_state;
1687 #endif /* defined (TC_GENERIC_RELAX_TABLE) */
1689 /* Relax_align. Advance location counter to next address that has 'alignment'
1690 lowest order bits all 0s, return size of adjustment made. */
1691 static relax_addressT
1692 relax_align (register relax_addressT address, /* Address now. */
1693 register int alignment /* Alignment (binary). */)
1695 relax_addressT mask;
1696 relax_addressT new_address;
1698 mask = ~((~0) << alignment);
1699 new_address = (address + mask) & (~mask);
1700 #ifdef LINKER_RELAXING_SHRINKS_ONLY
1702 /* We must provide lots of padding, so the linker can discard it
1703 when needed. The linker will not add extra space, ever. */
1704 new_address += (1 << alignment);
1706 return (new_address - address);
1709 /* Now we have a segment, not a crowd of sub-segments, we can make
1714 After this, all frags in this segment have addresses that are correct
1715 within the segment. Since segments live in different file addresses,
1716 these frag addresses may not be the same as final object-file
1720 relax_segment (struct frag *segment_frag_root, segT segment)
1722 unsigned long frag_count;
1724 relax_addressT address;
1727 /* In case md_estimate_size_before_relax() wants to make fixSs. */
1728 subseg_change (segment, 0);
1730 /* For each frag in segment: count and store (a 1st guess of)
1733 for (frag_count = 0, fragP = segment_frag_root;
1735 fragP = fragP->fr_next, frag_count ++)
1737 fragP->relax_marker = 0;
1738 fragP->fr_address = address;
1739 address += fragP->fr_fix;
1741 switch (fragP->fr_type)
1744 address += fragP->fr_offset * fragP->fr_var;
1751 addressT offset = relax_align (address, (int) fragP->fr_offset);
1753 if (fragP->fr_subtype != 0 && offset > fragP->fr_subtype)
1756 if (offset % fragP->fr_var != 0)
1758 as_bad_where (fragP->fr_file, fragP->fr_line,
1759 _("alignment padding (%lu bytes) not a multiple of %ld"),
1760 (unsigned long) offset, (long) fragP->fr_var);
1761 offset -= (offset % fragP->fr_var);
1770 /* Assume .org is nugatory. It will grow with 1st relax. */
1773 case rs_machine_dependent:
1774 /* If fr_symbol is an expression, this call to
1775 resolve_symbol_value sets up the correct segment, which will
1776 likely be needed in md_estimate_size_before_relax. */
1777 if (fragP->fr_symbol)
1778 resolve_symbol_value (fragP->fr_symbol);
1780 address += md_estimate_size_before_relax (fragP, segment);
1783 #ifndef WORKING_DOT_WORD
1784 /* Broken words don't concern us yet. */
1785 case rs_broken_word:
1790 /* Initial guess is always 1; doing otherwise can result in
1791 stable solutions that are larger than the minimum. */
1792 address += fragP->fr_offset = 1;
1796 address += eh_frame_estimate_size_before_relax (fragP);
1800 address += dwarf2dbg_estimate_size_before_relax (fragP);
1804 BAD_CASE (fragP->fr_type);
1811 unsigned long max_iterations;
1812 offsetT stretch; /* May be any size, 0 or negative. */
1813 /* Cumulative number of addresses we have relaxed this pass.
1814 We may have relaxed more than one address. */
1815 int stretched; /* Have we stretched on this pass? */
1816 /* This is 'cuz stretch may be zero, when, in fact some piece of code
1817 grew, and another shrank. If a branch instruction doesn't fit anymore,
1818 we could be scrod. */
1820 /* We want to prevent going into an infinite loop where one frag grows
1821 depending upon the location of a symbol which is in turn moved by
1822 the growing frag. eg:
1828 So we dictate that this algorithm can be at most O2. */
1829 max_iterations = frag_count * frag_count;
1830 /* Check for overflow. */
1831 if (max_iterations < frag_count)
1832 max_iterations = frag_count;
1839 for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next)
1842 addressT was_address;
1846 fragP->relax_marker ^= 1;
1847 was_address = fragP->fr_address;
1848 address = fragP->fr_address += stretch;
1849 symbolP = fragP->fr_symbol;
1850 offset = fragP->fr_offset;
1852 switch (fragP->fr_type)
1854 case rs_fill: /* .fill never relaxes. */
1858 #ifndef WORKING_DOT_WORD
1859 /* JF: This is RMS's idea. I do *NOT* want to be blamed
1860 for it I do not want to write it. I do not want to have
1861 anything to do with it. This is not the proper way to
1862 implement this misfeature. */
1863 case rs_broken_word:
1865 struct broken_word *lie;
1866 struct broken_word *untruth;
1868 /* Yes this is ugly (storing the broken_word pointer
1869 in the symbol slot). Still, this whole chunk of
1870 code is ugly, and I don't feel like doing anything
1871 about it. Think of it as stubbornness in action. */
1873 for (lie = (struct broken_word *) (fragP->fr_symbol);
1874 lie && lie->dispfrag == fragP;
1875 lie = lie->next_broken_word)
1881 offset = (S_GET_VALUE (lie->add)
1883 - S_GET_VALUE (lie->sub));
1884 if (offset <= -32768 || offset >= 32767)
1886 if (flag_warn_displacement)
1889 sprint_value (buf, (addressT) lie->addnum);
1890 as_warn_where (fragP->fr_file, fragP->fr_line,
1891 _(".word %s-%s+%s didn't fit"),
1892 S_GET_NAME (lie->add),
1893 S_GET_NAME (lie->sub),
1897 if (fragP->fr_subtype == 0)
1899 fragP->fr_subtype++;
1900 growth += md_short_jump_size;
1902 for (untruth = lie->next_broken_word;
1903 untruth && untruth->dispfrag == lie->dispfrag;
1904 untruth = untruth->next_broken_word)
1905 if ((symbol_get_frag (untruth->add)
1906 == symbol_get_frag (lie->add))
1907 && (S_GET_VALUE (untruth->add)
1908 == S_GET_VALUE (lie->add)))
1911 untruth->use_jump = lie;
1913 growth += md_long_jump_size;
1918 } /* case rs_broken_word */
1924 addressT oldoff, newoff;
1926 oldoff = relax_align (was_address + fragP->fr_fix,
1928 newoff = relax_align (address + fragP->fr_fix,
1931 if (fragP->fr_subtype != 0)
1933 if (oldoff > fragP->fr_subtype)
1935 if (newoff > fragP->fr_subtype)
1939 growth = newoff - oldoff;
1945 addressT target = offset;
1950 /* Convert from an actual address to an octet offset
1951 into the section. Here it is assumed that the
1952 section's VMA is zero, and can omit subtracting it
1953 from the symbol's value to get the address offset. */
1954 know (S_GET_SEGMENT (symbolP)->vma == 0);
1955 target += S_GET_VALUE (symbolP) * OCTETS_PER_BYTE;
1958 know (fragP->fr_next);
1959 after = fragP->fr_next->fr_address;
1960 growth = target - after;
1963 /* Growth may be negative, but variable part of frag
1964 cannot have fewer than 0 chars. That is, we can't
1966 as_bad_where (fragP->fr_file, fragP->fr_line,
1967 _("attempt to move .org backwards"));
1969 /* We've issued an error message. Change the
1970 frag to avoid cascading errors. */
1971 fragP->fr_type = rs_align;
1972 fragP->fr_subtype = 0;
1973 fragP->fr_offset = 0;
1974 fragP->fr_fix = after - was_address;
1978 /* This is an absolute growth factor */
1989 amount = S_GET_VALUE (symbolP);
1990 if (S_GET_SEGMENT (symbolP) != absolute_section
1991 || S_IS_COMMON (symbolP)
1992 || ! S_IS_DEFINED (symbolP))
1994 as_bad_where (fragP->fr_file, fragP->fr_line,
1995 _(".space specifies non-absolute value"));
1996 /* Prevent repeat of this error message. */
1997 fragP->fr_symbol = 0;
1999 else if (amount < 0)
2001 as_warn_where (fragP->fr_file, fragP->fr_line,
2002 _(".space or .fill with negative value, ignored"));
2003 fragP->fr_symbol = 0;
2006 growth = (was_address + fragP->fr_fix + amount
2007 - fragP->fr_next->fr_address);
2011 case rs_machine_dependent:
2012 #ifdef md_relax_frag
2013 growth = md_relax_frag (segment, fragP, stretch);
2015 #ifdef TC_GENERIC_RELAX_TABLE
2016 /* The default way to relax a frag is to look through
2017 TC_GENERIC_RELAX_TABLE. */
2018 growth = relax_frag (segment, fragP, stretch);
2019 #endif /* TC_GENERIC_RELAX_TABLE */
2028 value = resolve_symbol_value (fragP->fr_symbol);
2029 size = sizeof_leb128 (value, fragP->fr_subtype);
2030 growth = size - fragP->fr_offset;
2031 fragP->fr_offset = size;
2036 growth = eh_frame_relax_frag (fragP);
2040 growth = dwarf2dbg_relax_frag (fragP);
2044 BAD_CASE (fragP->fr_type);
2054 /* Until nothing further to relax. */
2055 while (stretched && -- max_iterations);
2058 as_fatal (_("Infinite loop encountered whilst attempting to compute the addresses of symbols in section %s"),
2059 segment_name (segment));
2063 for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next)
2064 if (fragP->last_fr_address != fragP->fr_address)
2066 fragP->last_fr_address = fragP->fr_address;
2074 Go through all the fixS's in a segment and see which ones can be
2075 handled now. (These consist of fixS where we have since discovered
2076 the value of a symbol, or the address of the frag involved.)
2077 For each one, call md_apply_fix to put the fix into the frag data.
2079 Result is a count of how many relocation structs will be needed to
2080 handle the remaining fixS's that we couldn't completely handle here.
2081 These will be output later by emit_relocations(). */
2084 fixup_segment (fixS *fixP, segT this_segment)
2086 long seg_reloc_count = 0;
2089 segT add_symbol_segment = absolute_section;
2091 if (fixP != NULL && abs_section_sym == NULL)
2092 abs_section_sym = section_symbol (absolute_section);
2094 /* If the linker is doing the relaxing, we must not do any fixups.
2096 Well, strictly speaking that's not true -- we could do any that
2097 are PC-relative and don't cross regions that could change size.
2098 And for the i960 we might be able to turn callx/callj into bal
2099 anyways in cases where we know the maximum displacement. */
2100 if (linkrelax && TC_LINKRELAX_FIXUP (this_segment))
2102 for (; fixP; fixP = fixP->fx_next)
2105 if (fixP->fx_addsy == NULL)
2107 /* There was no symbol required by this relocation.
2108 However, BFD doesn't really handle relocations
2109 without symbols well. So fake up a local symbol in
2110 the absolute section. */
2111 fixP->fx_addsy = abs_section_sym;
2113 symbol_mark_used_in_reloc (fixP->fx_addsy);
2114 if (fixP->fx_subsy != NULL)
2115 symbol_mark_used_in_reloc (fixP->fx_subsy);
2118 TC_ADJUST_RELOC_COUNT (fixP, seg_reloc_count);
2119 return seg_reloc_count;
2122 for (; fixP; fixP = fixP->fx_next)
2125 fprintf (stderr, "\nprocessing fixup:\n");
2129 fragP = fixP->fx_frag;
2131 #ifdef TC_VALIDATE_FIX
2132 TC_VALIDATE_FIX (fixP, this_segment, skip);
2134 add_number = fixP->fx_offset;
2136 if (fixP->fx_addsy != NULL
2137 && symbol_mri_common_p (fixP->fx_addsy))
2139 add_number += S_GET_VALUE (fixP->fx_addsy);
2140 fixP->fx_offset = add_number;
2142 = symbol_get_value_expression (fixP->fx_addsy)->X_add_symbol;
2145 if (fixP->fx_addsy != NULL)
2146 add_symbol_segment = S_GET_SEGMENT (fixP->fx_addsy);
2148 if (fixP->fx_subsy != NULL)
2150 segT sub_symbol_segment;
2151 resolve_symbol_value (fixP->fx_subsy);
2152 sub_symbol_segment = S_GET_SEGMENT (fixP->fx_subsy);
2153 if (fixP->fx_addsy != NULL
2154 && sub_symbol_segment == add_symbol_segment
2155 && !TC_FORCE_RELOCATION_SUB_SAME (fixP, add_symbol_segment))
2157 add_number += S_GET_VALUE (fixP->fx_addsy);
2158 add_number -= S_GET_VALUE (fixP->fx_subsy);
2159 fixP->fx_offset = add_number;
2160 fixP->fx_addsy = NULL;
2161 fixP->fx_subsy = NULL;
2163 /* See the comment below about 68k weirdness. */
2167 else if (sub_symbol_segment == absolute_section
2168 && !TC_FORCE_RELOCATION_SUB_ABS (fixP))
2170 add_number -= S_GET_VALUE (fixP->fx_subsy);
2171 fixP->fx_offset = add_number;
2172 fixP->fx_subsy = NULL;
2174 else if (sub_symbol_segment == this_segment
2175 && !TC_FORCE_RELOCATION_SUB_LOCAL (fixP))
2177 add_number -= S_GET_VALUE (fixP->fx_subsy);
2178 fixP->fx_offset = (add_number + fixP->fx_dot_value
2179 + fixP->fx_frag->fr_address);
2181 /* Make it pc-relative. If the back-end code has not
2182 selected a pc-relative reloc, cancel the adjustment
2183 we do later on all pc-relative relocs. */
2186 /* Do this for m68k even if it's already described
2187 as pc-relative. On the m68k, an operand of
2188 "pc@(foo-.-2)" should address "foo" in a
2189 pc-relative mode. */
2193 add_number += MD_PCREL_FROM_SECTION (fixP, this_segment);
2194 fixP->fx_subsy = NULL;
2197 else if (!TC_VALIDATE_FIX_SUB (fixP))
2199 as_bad_where (fixP->fx_file, fixP->fx_line,
2200 _("can't resolve `%s' {%s section} - `%s' {%s section}"),
2201 fixP->fx_addsy ? S_GET_NAME (fixP->fx_addsy) : "0",
2202 segment_name (add_symbol_segment),
2203 S_GET_NAME (fixP->fx_subsy),
2204 segment_name (sub_symbol_segment));
2210 if (add_symbol_segment == this_segment
2211 && !TC_FORCE_RELOCATION_LOCAL (fixP))
2213 /* This fixup was made when the symbol's segment was
2214 SEG_UNKNOWN, but it is now in the local segment.
2215 So we know how to do the address without relocation. */
2216 add_number += S_GET_VALUE (fixP->fx_addsy);
2217 fixP->fx_offset = add_number;
2219 add_number -= MD_PCREL_FROM_SECTION (fixP, this_segment);
2220 fixP->fx_addsy = NULL;
2223 else if (add_symbol_segment == absolute_section
2224 && !TC_FORCE_RELOCATION_ABS (fixP))
2226 add_number += S_GET_VALUE (fixP->fx_addsy);
2227 fixP->fx_offset = add_number;
2228 fixP->fx_addsy = NULL;
2230 else if (add_symbol_segment != undefined_section
2231 && ! bfd_is_com_section (add_symbol_segment)
2232 && MD_APPLY_SYM_VALUE (fixP))
2233 add_number += S_GET_VALUE (fixP->fx_addsy);
2238 add_number -= MD_PCREL_FROM_SECTION (fixP, this_segment);
2239 if (!fixP->fx_done && fixP->fx_addsy == NULL)
2241 /* There was no symbol required by this relocation.
2242 However, BFD doesn't really handle relocations
2243 without symbols well. So fake up a local symbol in
2244 the absolute section. */
2245 fixP->fx_addsy = abs_section_sym;
2250 md_apply_fix (fixP, &add_number, this_segment);
2255 if (fixP->fx_addsy == NULL)
2256 fixP->fx_addsy = abs_section_sym;
2257 symbol_mark_used_in_reloc (fixP->fx_addsy);
2258 if (fixP->fx_subsy != NULL)
2259 symbol_mark_used_in_reloc (fixP->fx_subsy);
2262 if (!fixP->fx_bit_fixP && !fixP->fx_no_overflow && fixP->fx_size != 0)
2264 if (fixP->fx_size < sizeof (valueT))
2269 mask--; /* Set all bits to one. */
2270 mask <<= fixP->fx_size * 8 - (fixP->fx_signed ? 1 : 0);
2271 if ((add_number & mask) != 0 && (add_number & mask) != mask)
2273 char buf[50], buf2[50];
2274 sprint_value (buf, fragP->fr_address + fixP->fx_where);
2275 if (add_number > 1000)
2276 sprint_value (buf2, add_number);
2278 sprintf (buf2, "%ld", (long) add_number);
2279 as_bad_where (fixP->fx_file, fixP->fx_line,
2280 _("value of %s too large for field of %d bytes at %s"),
2281 buf2, fixP->fx_size, buf);
2282 } /* Generic error checking. */
2284 #ifdef WARN_SIGNED_OVERFLOW_WORD
2285 /* Warn if a .word value is too large when treated as a signed
2286 number. We already know it is not too negative. This is to
2287 catch over-large switches generated by gcc on the 68k. */
2288 if (!flag_signed_overflow_ok
2289 && fixP->fx_size == 2
2290 && add_number > 0x7fff)
2291 as_bad_where (fixP->fx_file, fixP->fx_line,
2292 _("signed .word overflow; switch may be too large; %ld at 0x%lx"),
2294 (long) (fragP->fr_address + fixP->fx_where));
2296 } /* Not a bit fix. */
2298 #ifdef TC_VALIDATE_FIX
2299 skip: ATTRIBUTE_UNUSED_LABEL
2303 fprintf (stderr, "result:\n");
2306 } /* For each fixS in this segment. */
2308 TC_ADJUST_RELOC_COUNT (fixP, seg_reloc_count);
2309 return seg_reloc_count;
2313 number_to_chars_bigendian (char *buf, valueT val, int n)
2319 buf[n] = val & 0xff;
2325 number_to_chars_littleendian (char *buf, valueT val, int n)
2331 *buf++ = val & 0xff;
2337 write_print_statistics (FILE *file)
2339 fprintf (file, "fixups: %d\n", n_fixups);
2342 /* For debugging. */
2343 extern int indent_level;
2346 print_fixup (fixS *fixp)
2349 fprintf (stderr, "fix %lx %s:%d", (long) fixp, fixp->fx_file, fixp->fx_line);
2351 fprintf (stderr, " pcrel");
2352 if (fixp->fx_pcrel_adjust)
2353 fprintf (stderr, " pcrel_adjust=%d", fixp->fx_pcrel_adjust);
2354 if (fixp->fx_im_disp)
2357 fprintf (stderr, " im_disp=%d", fixp->fx_im_disp);
2359 fprintf (stderr, " im_disp");
2363 fprintf (stderr, " tcbit");
2365 fprintf (stderr, " done");
2366 fprintf (stderr, "\n size=%d frag=%lx where=%ld offset=%lx addnumber=%lx",
2367 fixp->fx_size, (long) fixp->fx_frag, (long) fixp->fx_where,
2368 (long) fixp->fx_offset, (long) fixp->fx_addnumber);
2369 fprintf (stderr, "\n %s (%d)", bfd_get_reloc_code_name (fixp->fx_r_type),
2373 fprintf (stderr, "\n +<");
2374 print_symbol_value_1 (stderr, fixp->fx_addsy);
2375 fprintf (stderr, ">");
2379 fprintf (stderr, "\n -<");
2380 print_symbol_value_1 (stderr, fixp->fx_subsy);
2381 fprintf (stderr, ">");
2383 fprintf (stderr, "\n");
2384 #ifdef TC_FIX_DATA_PRINT
2385 TC_FIX_DATA_PRINT (stderr, fixp);