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))
684 = symbol_get_value_expression (sym)->X_add_symbol;
685 const char *name = S_GET_NAME (sym);
686 if (!S_IS_COMMON (new_sym)
687 && !TC_FAKE_LABEL (name)
688 && (!S_IS_EXTERNAL (sym) || S_IS_LOCAL (sym)))
689 as_bad (_("Local symbol `%s' can't be equated to undefined symbol `%s'"),
690 name, S_GET_NAME (new_sym));
691 fixp->fx_offset += symbol_get_value_expression (sym)->X_add_number;
693 fixp->fx_addsy = sym;
696 if (symbol_mri_common_p (sym))
698 /* These symbols are handled specially in fixup_segment. */
702 /* If the symbol is undefined, common, weak, or global (ELF
703 shared libs), we can't replace it with the section symbol. */
704 if (S_FORCE_RELOC (fixp->fx_addsy, 1))
707 /* Is there some other (target cpu dependent) reason we can't adjust
708 this one? (E.g. relocations involving function addresses on
710 #ifdef tc_fix_adjustable
711 if (! tc_fix_adjustable (fixp))
715 /* Since we're reducing to section symbols, don't attempt to reduce
716 anything that's already using one. */
717 if (symbol_section_p (sym))
720 symsec = S_GET_SEGMENT (sym);
724 if (bfd_is_abs_section (symsec))
726 /* The fixup_segment routine normally will not use this
727 symbol in a relocation. */
731 /* Don't try to reduce relocs which refer to non-local symbols
732 in .linkonce sections. It can lead to confusion when a
733 debugging section refers to a .linkonce section. I hope
734 this will always be correct. */
735 if (symsec != sec && ! S_IS_LOCAL (sym))
737 if ((symsec->flags & SEC_LINK_ONCE) != 0
739 /* The GNU toolchain uses an extension for ELF: a
740 section beginning with the magic string
741 .gnu.linkonce is a linkonce section. */
742 && strncmp (segment_name (symsec), ".gnu.linkonce",
743 sizeof ".gnu.linkonce" - 1) == 0))
747 /* Never adjust a reloc against local symbol in a merge section
748 with non-zero addend. */
749 if ((symsec->flags & SEC_MERGE) != 0
750 && (fixp->fx_offset != 0 || fixp->fx_subsy != NULL))
753 /* Never adjust a reloc against TLS local symbol. */
754 if ((symsec->flags & SEC_THREAD_LOCAL) != 0)
757 /* We refetch the segment when calling section_symbol, rather
758 than using symsec, because S_GET_VALUE may wind up changing
759 the section when it calls resolve_symbol_value. */
760 fixp->fx_offset += S_GET_VALUE (sym);
761 fixp->fx_addsy = section_symbol (S_GET_SEGMENT (sym));
763 fprintf (stderr, "\nadjusted fixup:\n");
768 dump_section_relocs (abfd, sec, stderr);
772 fix_segment (bfd *abfd ATTRIBUTE_UNUSED,
774 PTR xxx ATTRIBUTE_UNUSED)
776 segment_info_type *seginfo = seg_info (sec);
778 fixup_segment (seginfo->fix_root, sec);
782 write_relocs (bfd *abfd, asection *sec, PTR xxx ATTRIBUTE_UNUSED)
784 segment_info_type *seginfo = seg_info (sec);
791 /* If seginfo is NULL, we did not create this section; don't do
797 for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next)
800 #ifndef RELOC_EXPANSION_POSSIBLE
801 /* Set up reloc information as well. */
802 relocs = (arelent **) xcalloc (n, sizeof (arelent *));
805 for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next)
808 bfd_reloc_status_type s;
817 /* If this is an undefined symbol which was equated to another
818 symbol, then generate the reloc against the latter symbol
819 rather than the former. */
820 sym = fixp->fx_addsy;
821 while (symbol_equated_reloc_p (sym))
825 /* We must avoid looping, as that can occur with a badly
827 n = symbol_get_value_expression (sym)->X_add_symbol;
830 fixp->fx_offset += symbol_get_value_expression (sym)->X_add_number;
833 fixp->fx_addsy = sym;
835 reloc = tc_gen_reloc (sec, fixp);
843 This test is triggered inappropriately for the SH:
844 if (fixp->fx_where + fixp->fx_size
845 > fixp->fx_frag->fr_fix + fixp->fx_frag->fr_offset)
849 s = bfd_install_relocation (stdoutput, reloc,
850 fixp->fx_frag->fr_literal,
851 fixp->fx_frag->fr_address,
857 case bfd_reloc_overflow:
858 as_bad_where (fixp->fx_file, fixp->fx_line,
859 _("relocation overflow"));
861 case bfd_reloc_outofrange:
862 as_bad_where (fixp->fx_file, fixp->fx_line,
863 _("relocation out of range"));
866 as_fatal (_("%s:%u: bad return from bfd_install_relocation: %x"),
867 fixp->fx_file, fixp->fx_line, s);
872 n = n * MAX_RELOC_EXPANSION;
873 /* Set up reloc information as well. */
874 relocs = (arelent **) xcalloc (n, sizeof (arelent *));
877 for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next)
880 bfd_reloc_status_type s;
890 /* If this is an undefined symbol which was equated to another
891 symbol, then generate the reloc against the latter symbol
892 rather than the former. */
893 sym = fixp->fx_addsy;
894 while (symbol_equated_reloc_p (sym))
898 /* We must avoid looping, as that can occur with a badly
900 n = symbol_get_value_expression (sym)->X_add_symbol;
903 fixp->fx_offset += symbol_get_value_expression (sym)->X_add_number;
906 fixp->fx_addsy = sym;
908 reloc = tc_gen_reloc (sec, fixp);
910 for (j = 0; reloc[j]; j++)
912 relocs[i++] = reloc[j];
915 if (fixp->fx_where + fixp->fx_size
916 > fixp->fx_frag->fr_fix + fixp->fx_frag->fr_offset)
917 as_bad_where (fixp->fx_file, fixp->fx_line,
918 _("internal error: fixup not contained within frag"));
919 for (j = 0; reloc[j]; j++)
921 s = bfd_install_relocation (stdoutput, reloc[j],
922 fixp->fx_frag->fr_literal,
923 fixp->fx_frag->fr_address,
929 case bfd_reloc_overflow:
930 as_bad_where (fixp->fx_file, fixp->fx_line,
931 _("relocation overflow"));
933 case bfd_reloc_outofrange:
934 as_bad_where (fixp->fx_file, fixp->fx_line,
935 _("relocation out of range"));
938 as_fatal (_("%s:%u: bad return from bfd_install_relocation: %x"),
939 fixp->fx_file, fixp->fx_line, s);
948 unsigned int i, j, nsyms;
950 sympp = bfd_get_outsymbols (stdoutput);
951 nsyms = bfd_get_symcount (stdoutput);
952 for (i = 0; i < n; i++)
953 if (((*relocs[i]->sym_ptr_ptr)->flags & BSF_SECTION_SYM) == 0)
955 for (j = 0; j < nsyms; j++)
956 if (sympp[j] == *relocs[i]->sym_ptr_ptr)
965 bfd_set_reloc (stdoutput, sec, relocs, n);
967 bfd_set_section_flags (abfd, sec,
968 (bfd_get_section_flags (abfd, sec)
969 & (flagword) ~SEC_RELOC));
971 #ifdef SET_SECTION_RELOCS
972 SET_SECTION_RELOCS (sec, relocs, n);
980 fprintf (stderr, "relocs for sec %s\n", sec->name);
981 for (i = 0; i < n; i++)
985 fprintf (stderr, " reloc %2d @%p off %4lx : sym %-10s addend %lx\n",
986 i, r, (unsigned long)r->address, s->name, (unsigned long)r->addend);
993 write_contents (bfd *abfd ATTRIBUTE_UNUSED,
995 PTR xxx ATTRIBUTE_UNUSED)
997 segment_info_type *seginfo = seg_info (sec);
1001 /* Write out the frags. */
1003 || !(bfd_get_section_flags (abfd, sec) & SEC_HAS_CONTENTS))
1006 for (f = seginfo->frchainP->frch_root;
1015 assert (f->fr_type == rs_fill);
1018 x = bfd_set_section_contents (stdoutput, sec,
1019 f->fr_literal, (file_ptr) offset,
1020 (bfd_size_type) f->fr_fix);
1023 bfd_perror (stdoutput->filename);
1024 as_perror (_("FATAL: Can't write %s"), stdoutput->filename);
1025 exit (EXIT_FAILURE);
1027 offset += f->fr_fix;
1029 fill_literal = f->fr_literal + f->fr_fix;
1030 fill_size = f->fr_var;
1031 count = f->fr_offset;
1032 assert (count >= 0);
1033 if (fill_size && count)
1036 if (fill_size > sizeof (buf))
1038 /* Do it the old way. Can this ever happen? */
1041 x = bfd_set_section_contents (stdoutput, sec,
1044 (bfd_size_type) fill_size);
1047 bfd_perror (stdoutput->filename);
1048 as_perror (_("FATAL: Can't write %s"),
1049 stdoutput->filename);
1050 exit (EXIT_FAILURE);
1052 offset += fill_size;
1057 /* Build a buffer full of fill objects and output it as
1058 often as necessary. This saves on the overhead of
1059 potentially lots of bfd_set_section_contents calls. */
1063 n_per_buf = sizeof (buf);
1064 memset (buf, *fill_literal, n_per_buf);
1069 n_per_buf = sizeof (buf) / fill_size;
1070 for (i = n_per_buf, bufp = buf; i; i--, bufp += fill_size)
1071 memcpy (bufp, fill_literal, fill_size);
1073 for (; count > 0; count -= n_per_buf)
1075 n_per_buf = n_per_buf > count ? count : n_per_buf;
1076 x = bfd_set_section_contents
1077 (stdoutput, sec, buf, (file_ptr) offset,
1078 (bfd_size_type) n_per_buf * fill_size);
1080 as_fatal (_("cannot write to output file"));
1081 offset += n_per_buf * fill_size;
1089 merge_data_into_text (void)
1091 seg_info (text_section)->frchainP->frch_last->fr_next =
1092 seg_info (data_section)->frchainP->frch_root;
1093 seg_info (text_section)->frchainP->frch_last =
1094 seg_info (data_section)->frchainP->frch_last;
1095 seg_info (data_section)->frchainP = 0;
1105 extern PTR bfd_alloc (bfd *, bfd_size_type);
1107 /* Count symbols. We can't rely on a count made by the loop in
1108 write_object_file, because *_frob_file may add a new symbol or
1111 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
1117 bfd_size_type amt = (bfd_size_type) nsyms * sizeof (asymbol *);
1119 asympp = (asymbol **) bfd_alloc (stdoutput, amt);
1120 symp = symbol_rootP;
1121 for (i = 0; i < nsyms; i++, symp = symbol_next (symp))
1123 asympp[i] = symbol_get_bfdsym (symp);
1124 symbol_mark_written (symp);
1129 result = bfd_set_symtab (stdoutput, asympp, nsyms);
1131 symbol_table_frozen = 1;
1134 /* Finish the subsegments. After every sub-segment, we fake an
1135 ".align ...". This conforms to BSD4.2 brane-damage. We then fake
1136 ".fill 0" because that is the kind of frag that requires least
1137 thought. ".align" frags like to have a following frag since that
1138 makes calculating their intended length trivial. */
1140 #ifndef SUB_SEGMENT_ALIGN
1142 /* The last subsegment gets an alignment corresponding to the alignment
1143 of the section. This allows proper nop-filling at the end of
1144 code-bearing sections. */
1145 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) \
1146 (!(FRCHAIN)->frch_next || (FRCHAIN)->frch_next->frch_seg != (SEG) \
1147 ? get_recorded_alignment (SEG) : 0)
1149 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) 0
1154 subsegs_finish (void)
1156 struct frchain *frchainP;
1158 for (frchainP = frchain_root; frchainP; frchainP = frchainP->frch_next)
1162 subseg_set (frchainP->frch_seg, frchainP->frch_subseg);
1164 /* This now gets called even if we had errors. In that case,
1165 any alignment is meaningless, and, moreover, will look weird
1166 if we are generating a listing. */
1169 alignment = SUB_SEGMENT_ALIGN (now_seg, frchainP);
1170 if ((bfd_get_section_flags (now_seg->owner, now_seg) & SEC_MERGE)
1171 && now_seg->entsize)
1173 unsigned int entsize = now_seg->entsize;
1176 while ((entsize & 1) == 0)
1181 if (entalign > alignment)
1182 alignment = entalign;
1186 if (subseg_text_p (now_seg))
1187 frag_align_code (alignment, 0);
1189 frag_align (alignment, 0, 0);
1191 /* frag_align will have left a new frag.
1192 Use this last frag for an empty ".fill".
1194 For this segment ...
1195 Create a last frag. Do not leave a "being filled in frag". */
1196 frag_wane (frag_now);
1197 frag_now->fr_fix = 0;
1198 know (frag_now->fr_next == NULL);
1202 /* Write the object file. */
1205 write_object_file (void)
1207 #ifndef WORKING_DOT_WORD
1208 fragS *fragP; /* Track along all frags. */
1211 /* Do we really want to write it? */
1213 int n_warns, n_errs;
1214 n_warns = had_warnings ();
1215 n_errs = had_errors ();
1216 /* The -Z flag indicates that an object file should be generated,
1217 regardless of warnings and errors. */
1218 if (flag_always_generate_output)
1220 if (n_warns || n_errs)
1221 as_warn (_("%d error%s, %d warning%s, generating bad object file"),
1222 n_errs, n_errs == 1 ? "" : "s",
1223 n_warns, n_warns == 1 ? "" : "s");
1228 as_fatal (_("%d error%s, %d warning%s, no object file generated"),
1229 n_errs, n_errs == 1 ? "" : "s",
1230 n_warns, n_warns == 1 ? "" : "s");
1235 /* Under VMS we try to be compatible with VAX-11 "C". Thus, we call
1236 a routine to check for the definition of the procedure "_main",
1237 and if so -- fix it up so that it can be program entry point. */
1238 vms_check_for_main ();
1239 #endif /* OBJ_VMS */
1241 /* From now on, we don't care about sub-segments. Build one frag chain
1242 for each segment. Linked thru fr_next. */
1244 /* Remove the sections created by gas for its own purposes. */
1248 bfd_section_list_remove (stdoutput, reg_section);
1249 bfd_section_list_remove (stdoutput, expr_section);
1250 stdoutput->section_count -= 2;
1252 bfd_map_over_sections (stdoutput, renumber_sections, &i);
1255 bfd_map_over_sections (stdoutput, chain_frchains_together, (char *) 0);
1257 /* We have two segments. If user gave -R flag, then we must put the
1258 data frags into the text segment. Do this before relaxing so
1259 we know to take advantage of -R and make shorter addresses. */
1260 if (flag_readonly_data_in_text)
1262 merge_data_into_text ();
1269 #ifndef WORKING_DOT_WORD
1270 /* We need to reset the markers in the broken word list and
1271 associated frags between calls to relax_segment (via
1272 relax_seg). Since the broken word list is global, we do it
1273 once per round, rather than locally in relax_segment for each
1275 struct broken_word *brokp;
1277 for (brokp = broken_words;
1278 brokp != (struct broken_word *) NULL;
1279 brokp = brokp->next_broken_word)
1283 if (brokp->dispfrag != (fragS *) NULL
1284 && brokp->dispfrag->fr_type == rs_broken_word)
1285 brokp->dispfrag->fr_subtype = 0;
1290 bfd_map_over_sections (stdoutput, relax_seg, &changed);
1295 /* Note - Most ports will use the default value of
1296 TC_FINALIZE_SYMS_BEFORE_SIZE_SEG, which 1. This will force
1297 local symbols to be resolved, removing their frag information.
1298 Some ports however, will not have finished relaxing all of
1299 their frags and will still need the local symbol frag
1300 information. These ports can set
1301 TC_FINALIZE_SYMS_BEFORE_SIZE_SEG to 0. */
1302 finalize_syms = TC_FINALIZE_SYMS_BEFORE_SIZE_SEG;
1304 bfd_map_over_sections (stdoutput, size_seg, (char *) 0);
1306 /* Relaxation has completed. Freeze all syms. */
1309 #ifdef md_post_relax_hook
1313 #ifndef WORKING_DOT_WORD
1315 struct broken_word *lie;
1316 struct broken_word **prevP;
1318 prevP = &broken_words;
1319 for (lie = broken_words; lie; lie = lie->next_broken_word)
1324 subseg_change (lie->seg, lie->subseg);
1325 exp.X_op = O_subtract;
1326 exp.X_add_symbol = lie->add;
1327 exp.X_op_symbol = lie->sub;
1328 exp.X_add_number = lie->addnum;
1329 #ifdef TC_CONS_FIX_NEW
1330 TC_CONS_FIX_NEW (lie->frag,
1331 lie->word_goes_here - lie->frag->fr_literal,
1334 fix_new_exp (lie->frag,
1335 lie->word_goes_here - lie->frag->fr_literal,
1336 2, &exp, 0, BFD_RELOC_16);
1338 *prevP = lie->next_broken_word;
1341 prevP = &(lie->next_broken_word);
1343 for (lie = broken_words; lie;)
1345 struct broken_word *untruth;
1347 addressT table_addr;
1348 addressT from_addr, to_addr;
1351 subseg_change (lie->seg, lie->subseg);
1352 fragP = lie->dispfrag;
1354 /* Find out how many broken_words go here. */
1357 untruth && untruth->dispfrag == fragP;
1358 untruth = untruth->next_broken_word)
1359 if (untruth->added == 1)
1362 table_ptr = lie->dispfrag->fr_opcode;
1363 table_addr = (lie->dispfrag->fr_address
1364 + (table_ptr - lie->dispfrag->fr_literal));
1365 /* Create the jump around the long jumps. This is a short
1366 jump from table_ptr+0 to table_ptr+n*long_jump_size. */
1367 from_addr = table_addr;
1368 to_addr = table_addr + md_short_jump_size + n * md_long_jump_size;
1369 md_create_short_jump (table_ptr, from_addr, to_addr, lie->dispfrag,
1371 table_ptr += md_short_jump_size;
1372 table_addr += md_short_jump_size;
1375 lie && lie->dispfrag == fragP;
1376 m++, lie = lie->next_broken_word)
1378 if (lie->added == 2)
1380 /* Patch the jump table. */
1381 /* This is the offset from ??? to table_ptr+0. */
1382 to_addr = table_addr - S_GET_VALUE (lie->sub);
1383 #ifdef TC_CHECK_ADJUSTED_BROKEN_DOT_WORD
1384 TC_CHECK_ADJUSTED_BROKEN_DOT_WORD (to_addr, lie);
1386 md_number_to_chars (lie->word_goes_here, to_addr, 2);
1387 for (untruth = lie->next_broken_word;
1388 untruth && untruth->dispfrag == fragP;
1389 untruth = untruth->next_broken_word)
1391 if (untruth->use_jump == lie)
1392 md_number_to_chars (untruth->word_goes_here, to_addr, 2);
1395 /* Install the long jump. */
1396 /* This is a long jump from table_ptr+0 to the final target. */
1397 from_addr = table_addr;
1398 to_addr = S_GET_VALUE (lie->add) + lie->addnum;
1399 md_create_long_jump (table_ptr, from_addr, to_addr, lie->dispfrag,
1401 table_ptr += md_long_jump_size;
1402 table_addr += md_long_jump_size;
1406 #endif /* not WORKING_DOT_WORD */
1408 /* Resolve symbol values. This needs to be done before processing
1414 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
1415 resolve_symbol_value (symp);
1417 resolve_local_symbol_values ();
1421 #ifdef tc_frob_file_before_adjust
1422 tc_frob_file_before_adjust ();
1424 #ifdef obj_frob_file_before_adjust
1425 obj_frob_file_before_adjust ();
1428 bfd_map_over_sections (stdoutput, adjust_reloc_syms, (char *) 0);
1430 #ifdef tc_frob_file_before_fix
1431 tc_frob_file_before_fix ();
1433 #ifdef obj_frob_file_before_fix
1434 obj_frob_file_before_fix ();
1437 bfd_map_over_sections (stdoutput, fix_segment, (char *) 0);
1439 /* Set up symbol table, and write it out. */
1443 bfd_boolean skip_next_symbol = FALSE;
1445 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
1450 if (skip_next_symbol)
1452 /* Don't do anything besides moving the value of the
1453 symbol from the GAS value-field to the BFD value-field. */
1454 symbol_get_bfdsym (symp)->value = S_GET_VALUE (symp);
1455 skip_next_symbol = FALSE;
1459 if (symbol_mri_common_p (symp))
1461 if (S_IS_EXTERNAL (symp))
1462 as_bad (_("%s: global symbols not supported in common sections"),
1464 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
1468 name = S_GET_NAME (symp);
1472 decode_local_label_name ((char *) S_GET_NAME (symp));
1473 /* They only differ if `name' is a fb or dollar local
1475 if (name2 != name && ! S_IS_DEFINED (symp))
1476 as_bad (_("local label `%s' is not defined"), name2);
1479 /* Do it again, because adjust_reloc_syms might introduce
1480 more symbols. They'll probably only be section symbols,
1481 but they'll still need to have the values computed. */
1482 resolve_symbol_value (symp);
1484 /* Skip symbols which were equated to undefined or common
1486 if (symbol_equated_reloc_p (symp))
1488 const char *name = S_GET_NAME (symp);
1489 if (S_IS_COMMON (symp)
1490 && !TC_FAKE_LABEL (name)
1491 && (!S_IS_EXTERNAL (symp) || S_IS_LOCAL (symp)))
1493 expressionS *e = symbol_get_value_expression (symp);
1494 as_bad (_("Local symbol `%s' can't be equated to common symbol `%s'"),
1495 name, S_GET_NAME (e->X_add_symbol));
1497 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
1501 /* So far, common symbols have been treated like undefined symbols.
1502 Put them in the common section now. */
1503 if (S_IS_DEFINED (symp) == 0
1504 && S_GET_VALUE (symp) != 0)
1505 S_SET_SEGMENT (symp, bfd_com_section_ptr);
1507 #ifdef obj_frob_symbol
1508 obj_frob_symbol (symp, punt);
1510 #ifdef tc_frob_symbol
1511 if (! punt || symbol_used_in_reloc_p (symp))
1512 tc_frob_symbol (symp, punt);
1515 /* If we don't want to keep this symbol, splice it out of
1516 the chain now. If EMIT_SECTION_SYMBOLS is 0, we never
1517 want section symbols. Otherwise, we skip local symbols
1518 and symbols that the frob_symbol macros told us to punt,
1519 but we keep such symbols if they are used in relocs. */
1520 if (symp == abs_section_sym
1521 || (! EMIT_SECTION_SYMBOLS
1522 && symbol_section_p (symp))
1523 /* Note that S_IS_EXTERNAL and S_IS_LOCAL are not always
1524 opposites. Sometimes the former checks flags and the
1525 latter examines the name... */
1526 || (!S_IS_EXTERNAL (symp)
1527 && (punt || S_IS_LOCAL (symp))
1528 && ! symbol_used_in_reloc_p (symp)))
1530 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
1532 /* After symbol_remove, symbol_next(symp) still returns
1533 the one that came after it in the chain. So we don't
1534 need to do any extra cleanup work here. */
1538 /* Make sure we really got a value for the symbol. */
1539 if (! symbol_resolved_p (symp))
1541 as_bad (_("can't resolve value for symbol `%s'"),
1543 symbol_mark_resolved (symp);
1546 /* Set the value into the BFD symbol. Up til now the value
1547 has only been kept in the gas symbolS struct. */
1548 symbol_get_bfdsym (symp)->value = S_GET_VALUE (symp);
1550 /* A warning construct is a warning symbol followed by the
1551 symbol warned about. Don't let anything object-format or
1552 target-specific muck with it; it's ready for output. */
1553 if (symbol_get_bfdsym (symp)->flags & BSF_WARNING)
1554 skip_next_symbol = TRUE;
1560 /* Now do any format-specific adjustments to the symbol table, such
1561 as adding file symbols. */
1562 #ifdef tc_adjust_symtab
1563 tc_adjust_symtab ();
1565 #ifdef obj_adjust_symtab
1566 obj_adjust_symtab ();
1569 /* Now that all the sizes are known, and contents correct, we can
1570 start writing to the file. */
1573 /* If *_frob_file changes the symbol value at this point, it is
1574 responsible for moving the changed value into symp->bsym->value
1575 as well. Hopefully all symbol value changing can be done in
1580 #ifdef obj_frob_file
1584 bfd_map_over_sections (stdoutput, write_relocs, (char *) 0);
1586 #ifdef tc_frob_file_after_relocs
1587 tc_frob_file_after_relocs ();
1589 #ifdef obj_frob_file_after_relocs
1590 obj_frob_file_after_relocs ();
1593 bfd_map_over_sections (stdoutput, write_contents, (char *) 0);
1596 #ifdef TC_GENERIC_RELAX_TABLE
1597 /* Relax a fragment by scanning TC_GENERIC_RELAX_TABLE. */
1600 relax_frag (segT segment, fragS *fragP, long stretch)
1602 const relax_typeS *this_type;
1603 const relax_typeS *start_type;
1604 relax_substateT next_state;
1605 relax_substateT this_state;
1611 const relax_typeS *table;
1613 target = fragP->fr_offset;
1614 address = fragP->fr_address;
1615 table = TC_GENERIC_RELAX_TABLE;
1616 this_state = fragP->fr_subtype;
1617 start_type = this_type = table + this_state;
1618 symbolP = fragP->fr_symbol;
1624 sym_frag = symbol_get_frag (symbolP);
1626 #ifndef DIFF_EXPR_OK
1627 know (sym_frag != NULL);
1629 know (S_GET_SEGMENT (symbolP) != absolute_section
1630 || sym_frag == &zero_address_frag);
1631 target += S_GET_VALUE (symbolP);
1633 /* If frag has yet to be reached on this pass,
1634 assume it will move by STRETCH just as we did.
1635 If this is not so, it will be because some frag
1636 between grows, and that will force another pass. */
1639 && sym_frag->relax_marker != fragP->relax_marker
1640 && S_GET_SEGMENT (symbolP) == segment)
1646 aim = target - address - fragP->fr_fix;
1647 #ifdef TC_PCREL_ADJUST
1648 /* Currently only the ns32k family needs this. */
1649 aim += TC_PCREL_ADJUST (fragP);
1652 #ifdef md_prepare_relax_scan
1653 /* Formerly called M68K_AIM_KLUDGE. */
1654 md_prepare_relax_scan (fragP, address, aim, this_state, this_type);
1659 /* Look backwards. */
1660 for (next_state = this_type->rlx_more; next_state;)
1661 if (aim >= this_type->rlx_backward)
1665 /* Grow to next state. */
1666 this_state = next_state;
1667 this_type = table + this_state;
1668 next_state = this_type->rlx_more;
1673 /* Look forwards. */
1674 for (next_state = this_type->rlx_more; next_state;)
1675 if (aim <= this_type->rlx_forward)
1679 /* Grow to next state. */
1680 this_state = next_state;
1681 this_type = table + this_state;
1682 next_state = this_type->rlx_more;
1686 growth = this_type->rlx_length - start_type->rlx_length;
1688 fragP->fr_subtype = this_state;
1692 #endif /* defined (TC_GENERIC_RELAX_TABLE) */
1694 /* Relax_align. Advance location counter to next address that has 'alignment'
1695 lowest order bits all 0s, return size of adjustment made. */
1696 static relax_addressT
1697 relax_align (register relax_addressT address, /* Address now. */
1698 register int alignment /* Alignment (binary). */)
1700 relax_addressT mask;
1701 relax_addressT new_address;
1703 mask = ~((~0) << alignment);
1704 new_address = (address + mask) & (~mask);
1705 #ifdef LINKER_RELAXING_SHRINKS_ONLY
1707 /* We must provide lots of padding, so the linker can discard it
1708 when needed. The linker will not add extra space, ever. */
1709 new_address += (1 << alignment);
1711 return (new_address - address);
1714 /* Now we have a segment, not a crowd of sub-segments, we can make
1719 After this, all frags in this segment have addresses that are correct
1720 within the segment. Since segments live in different file addresses,
1721 these frag addresses may not be the same as final object-file
1725 relax_segment (struct frag *segment_frag_root, segT segment)
1727 unsigned long frag_count;
1729 relax_addressT address;
1732 /* In case md_estimate_size_before_relax() wants to make fixSs. */
1733 subseg_change (segment, 0);
1735 /* For each frag in segment: count and store (a 1st guess of)
1738 for (frag_count = 0, fragP = segment_frag_root;
1740 fragP = fragP->fr_next, frag_count ++)
1742 fragP->relax_marker = 0;
1743 fragP->fr_address = address;
1744 address += fragP->fr_fix;
1746 switch (fragP->fr_type)
1749 address += fragP->fr_offset * fragP->fr_var;
1756 addressT offset = relax_align (address, (int) fragP->fr_offset);
1758 if (fragP->fr_subtype != 0 && offset > fragP->fr_subtype)
1761 if (offset % fragP->fr_var != 0)
1763 as_bad_where (fragP->fr_file, fragP->fr_line,
1764 _("alignment padding (%lu bytes) not a multiple of %ld"),
1765 (unsigned long) offset, (long) fragP->fr_var);
1766 offset -= (offset % fragP->fr_var);
1775 /* Assume .org is nugatory. It will grow with 1st relax. */
1778 case rs_machine_dependent:
1779 /* If fr_symbol is an expression, this call to
1780 resolve_symbol_value sets up the correct segment, which will
1781 likely be needed in md_estimate_size_before_relax. */
1782 if (fragP->fr_symbol)
1783 resolve_symbol_value (fragP->fr_symbol);
1785 address += md_estimate_size_before_relax (fragP, segment);
1788 #ifndef WORKING_DOT_WORD
1789 /* Broken words don't concern us yet. */
1790 case rs_broken_word:
1795 /* Initial guess is always 1; doing otherwise can result in
1796 stable solutions that are larger than the minimum. */
1797 address += fragP->fr_offset = 1;
1801 address += eh_frame_estimate_size_before_relax (fragP);
1805 address += dwarf2dbg_estimate_size_before_relax (fragP);
1809 BAD_CASE (fragP->fr_type);
1816 unsigned long max_iterations;
1817 offsetT stretch; /* May be any size, 0 or negative. */
1818 /* Cumulative number of addresses we have relaxed this pass.
1819 We may have relaxed more than one address. */
1820 int stretched; /* Have we stretched on this pass? */
1821 /* This is 'cuz stretch may be zero, when, in fact some piece of code
1822 grew, and another shrank. If a branch instruction doesn't fit anymore,
1823 we could be scrod. */
1825 /* We want to prevent going into an infinite loop where one frag grows
1826 depending upon the location of a symbol which is in turn moved by
1827 the growing frag. eg:
1833 So we dictate that this algorithm can be at most O2. */
1834 max_iterations = frag_count * frag_count;
1835 /* Check for overflow. */
1836 if (max_iterations < frag_count)
1837 max_iterations = frag_count;
1844 for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next)
1847 addressT was_address;
1851 fragP->relax_marker ^= 1;
1852 was_address = fragP->fr_address;
1853 address = fragP->fr_address += stretch;
1854 symbolP = fragP->fr_symbol;
1855 offset = fragP->fr_offset;
1857 switch (fragP->fr_type)
1859 case rs_fill: /* .fill never relaxes. */
1863 #ifndef WORKING_DOT_WORD
1864 /* JF: This is RMS's idea. I do *NOT* want to be blamed
1865 for it I do not want to write it. I do not want to have
1866 anything to do with it. This is not the proper way to
1867 implement this misfeature. */
1868 case rs_broken_word:
1870 struct broken_word *lie;
1871 struct broken_word *untruth;
1873 /* Yes this is ugly (storing the broken_word pointer
1874 in the symbol slot). Still, this whole chunk of
1875 code is ugly, and I don't feel like doing anything
1876 about it. Think of it as stubbornness in action. */
1878 for (lie = (struct broken_word *) (fragP->fr_symbol);
1879 lie && lie->dispfrag == fragP;
1880 lie = lie->next_broken_word)
1886 offset = (S_GET_VALUE (lie->add)
1888 - S_GET_VALUE (lie->sub));
1889 if (offset <= -32768 || offset >= 32767)
1891 if (flag_warn_displacement)
1894 sprint_value (buf, (addressT) lie->addnum);
1895 as_warn_where (fragP->fr_file, fragP->fr_line,
1896 _(".word %s-%s+%s didn't fit"),
1897 S_GET_NAME (lie->add),
1898 S_GET_NAME (lie->sub),
1902 if (fragP->fr_subtype == 0)
1904 fragP->fr_subtype++;
1905 growth += md_short_jump_size;
1907 for (untruth = lie->next_broken_word;
1908 untruth && untruth->dispfrag == lie->dispfrag;
1909 untruth = untruth->next_broken_word)
1910 if ((symbol_get_frag (untruth->add)
1911 == symbol_get_frag (lie->add))
1912 && (S_GET_VALUE (untruth->add)
1913 == S_GET_VALUE (lie->add)))
1916 untruth->use_jump = lie;
1918 growth += md_long_jump_size;
1923 } /* case rs_broken_word */
1929 addressT oldoff, newoff;
1931 oldoff = relax_align (was_address + fragP->fr_fix,
1933 newoff = relax_align (address + fragP->fr_fix,
1936 if (fragP->fr_subtype != 0)
1938 if (oldoff > fragP->fr_subtype)
1940 if (newoff > fragP->fr_subtype)
1944 growth = newoff - oldoff;
1950 addressT target = offset;
1955 /* Convert from an actual address to an octet offset
1956 into the section. Here it is assumed that the
1957 section's VMA is zero, and can omit subtracting it
1958 from the symbol's value to get the address offset. */
1959 know (S_GET_SEGMENT (symbolP)->vma == 0);
1960 target += S_GET_VALUE (symbolP) * OCTETS_PER_BYTE;
1963 know (fragP->fr_next);
1964 after = fragP->fr_next->fr_address;
1965 growth = target - after;
1968 /* Growth may be negative, but variable part of frag
1969 cannot have fewer than 0 chars. That is, we can't
1971 as_bad_where (fragP->fr_file, fragP->fr_line,
1972 _("attempt to move .org backwards"));
1974 /* We've issued an error message. Change the
1975 frag to avoid cascading errors. */
1976 fragP->fr_type = rs_align;
1977 fragP->fr_subtype = 0;
1978 fragP->fr_offset = 0;
1979 fragP->fr_fix = after - was_address;
1983 /* This is an absolute growth factor */
1994 amount = S_GET_VALUE (symbolP);
1995 if (S_GET_SEGMENT (symbolP) != absolute_section
1996 || S_IS_COMMON (symbolP)
1997 || ! S_IS_DEFINED (symbolP))
1999 as_bad_where (fragP->fr_file, fragP->fr_line,
2000 _(".space specifies non-absolute value"));
2001 /* Prevent repeat of this error message. */
2002 fragP->fr_symbol = 0;
2004 else if (amount < 0)
2006 as_warn_where (fragP->fr_file, fragP->fr_line,
2007 _(".space or .fill with negative value, ignored"));
2008 fragP->fr_symbol = 0;
2011 growth = (was_address + fragP->fr_fix + amount
2012 - fragP->fr_next->fr_address);
2016 case rs_machine_dependent:
2017 #ifdef md_relax_frag
2018 growth = md_relax_frag (segment, fragP, stretch);
2020 #ifdef TC_GENERIC_RELAX_TABLE
2021 /* The default way to relax a frag is to look through
2022 TC_GENERIC_RELAX_TABLE. */
2023 growth = relax_frag (segment, fragP, stretch);
2024 #endif /* TC_GENERIC_RELAX_TABLE */
2033 value = resolve_symbol_value (fragP->fr_symbol);
2034 size = sizeof_leb128 (value, fragP->fr_subtype);
2035 growth = size - fragP->fr_offset;
2036 fragP->fr_offset = size;
2041 growth = eh_frame_relax_frag (fragP);
2045 growth = dwarf2dbg_relax_frag (fragP);
2049 BAD_CASE (fragP->fr_type);
2059 /* Until nothing further to relax. */
2060 while (stretched && -- max_iterations);
2063 as_fatal (_("Infinite loop encountered whilst attempting to compute the addresses of symbols in section %s"),
2064 segment_name (segment));
2068 for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next)
2069 if (fragP->last_fr_address != fragP->fr_address)
2071 fragP->last_fr_address = fragP->fr_address;
2079 Go through all the fixS's in a segment and see which ones can be
2080 handled now. (These consist of fixS where we have since discovered
2081 the value of a symbol, or the address of the frag involved.)
2082 For each one, call md_apply_fix to put the fix into the frag data.
2084 Result is a count of how many relocation structs will be needed to
2085 handle the remaining fixS's that we couldn't completely handle here.
2086 These will be output later by emit_relocations(). */
2089 fixup_segment (fixS *fixP, segT this_segment)
2091 long seg_reloc_count = 0;
2094 segT add_symbol_segment = absolute_section;
2096 if (fixP != NULL && abs_section_sym == NULL)
2097 abs_section_sym = section_symbol (absolute_section);
2099 /* If the linker is doing the relaxing, we must not do any fixups.
2101 Well, strictly speaking that's not true -- we could do any that
2102 are PC-relative and don't cross regions that could change size.
2103 And for the i960 we might be able to turn callx/callj into bal
2104 anyways in cases where we know the maximum displacement. */
2105 if (linkrelax && TC_LINKRELAX_FIXUP (this_segment))
2107 for (; fixP; fixP = fixP->fx_next)
2110 if (fixP->fx_addsy == NULL)
2112 /* There was no symbol required by this relocation.
2113 However, BFD doesn't really handle relocations
2114 without symbols well. So fake up a local symbol in
2115 the absolute section. */
2116 fixP->fx_addsy = abs_section_sym;
2118 symbol_mark_used_in_reloc (fixP->fx_addsy);
2119 if (fixP->fx_subsy != NULL)
2120 symbol_mark_used_in_reloc (fixP->fx_subsy);
2123 TC_ADJUST_RELOC_COUNT (fixP, seg_reloc_count);
2124 return seg_reloc_count;
2127 for (; fixP; fixP = fixP->fx_next)
2130 fprintf (stderr, "\nprocessing fixup:\n");
2134 fragP = fixP->fx_frag;
2136 #ifdef TC_VALIDATE_FIX
2137 TC_VALIDATE_FIX (fixP, this_segment, skip);
2139 add_number = fixP->fx_offset;
2141 if (fixP->fx_addsy != NULL
2142 && symbol_mri_common_p (fixP->fx_addsy))
2144 add_number += S_GET_VALUE (fixP->fx_addsy);
2145 fixP->fx_offset = add_number;
2147 = symbol_get_value_expression (fixP->fx_addsy)->X_add_symbol;
2150 if (fixP->fx_addsy != NULL)
2151 add_symbol_segment = S_GET_SEGMENT (fixP->fx_addsy);
2153 if (fixP->fx_subsy != NULL)
2155 segT sub_symbol_segment;
2156 resolve_symbol_value (fixP->fx_subsy);
2157 sub_symbol_segment = S_GET_SEGMENT (fixP->fx_subsy);
2158 if (fixP->fx_addsy != NULL
2159 && sub_symbol_segment == add_symbol_segment
2160 && !TC_FORCE_RELOCATION_SUB_SAME (fixP, add_symbol_segment))
2162 add_number += S_GET_VALUE (fixP->fx_addsy);
2163 add_number -= S_GET_VALUE (fixP->fx_subsy);
2164 fixP->fx_offset = add_number;
2165 fixP->fx_addsy = NULL;
2166 fixP->fx_subsy = NULL;
2168 /* See the comment below about 68k weirdness. */
2172 else if (sub_symbol_segment == absolute_section
2173 && !TC_FORCE_RELOCATION_SUB_ABS (fixP))
2175 add_number -= S_GET_VALUE (fixP->fx_subsy);
2176 fixP->fx_offset = add_number;
2177 fixP->fx_subsy = NULL;
2179 else if (sub_symbol_segment == this_segment
2180 && !TC_FORCE_RELOCATION_SUB_LOCAL (fixP))
2182 add_number -= S_GET_VALUE (fixP->fx_subsy);
2183 fixP->fx_offset = (add_number + fixP->fx_dot_value
2184 + fixP->fx_frag->fr_address);
2186 /* Make it pc-relative. If the back-end code has not
2187 selected a pc-relative reloc, cancel the adjustment
2188 we do later on all pc-relative relocs. */
2191 /* Do this for m68k even if it's already described
2192 as pc-relative. On the m68k, an operand of
2193 "pc@(foo-.-2)" should address "foo" in a
2194 pc-relative mode. */
2198 add_number += MD_PCREL_FROM_SECTION (fixP, this_segment);
2199 fixP->fx_subsy = NULL;
2202 else if (!TC_VALIDATE_FIX_SUB (fixP))
2204 as_bad_where (fixP->fx_file, fixP->fx_line,
2205 _("can't resolve `%s' {%s section} - `%s' {%s section}"),
2206 fixP->fx_addsy ? S_GET_NAME (fixP->fx_addsy) : "0",
2207 segment_name (add_symbol_segment),
2208 S_GET_NAME (fixP->fx_subsy),
2209 segment_name (sub_symbol_segment));
2215 if (add_symbol_segment == this_segment
2216 && !TC_FORCE_RELOCATION_LOCAL (fixP))
2218 /* This fixup was made when the symbol's segment was
2219 SEG_UNKNOWN, but it is now in the local segment.
2220 So we know how to do the address without relocation. */
2221 add_number += S_GET_VALUE (fixP->fx_addsy);
2222 fixP->fx_offset = add_number;
2224 add_number -= MD_PCREL_FROM_SECTION (fixP, this_segment);
2225 fixP->fx_addsy = NULL;
2228 else if (add_symbol_segment == absolute_section
2229 && !TC_FORCE_RELOCATION_ABS (fixP))
2231 add_number += S_GET_VALUE (fixP->fx_addsy);
2232 fixP->fx_offset = add_number;
2233 fixP->fx_addsy = NULL;
2235 else if (add_symbol_segment != undefined_section
2236 && ! bfd_is_com_section (add_symbol_segment)
2237 && MD_APPLY_SYM_VALUE (fixP))
2238 add_number += S_GET_VALUE (fixP->fx_addsy);
2243 add_number -= MD_PCREL_FROM_SECTION (fixP, this_segment);
2244 if (!fixP->fx_done && fixP->fx_addsy == NULL)
2246 /* There was no symbol required by this relocation.
2247 However, BFD doesn't really handle relocations
2248 without symbols well. So fake up a local symbol in
2249 the absolute section. */
2250 fixP->fx_addsy = abs_section_sym;
2255 md_apply_fix (fixP, &add_number, this_segment);
2260 if (fixP->fx_addsy == NULL)
2261 fixP->fx_addsy = abs_section_sym;
2262 symbol_mark_used_in_reloc (fixP->fx_addsy);
2263 if (fixP->fx_subsy != NULL)
2264 symbol_mark_used_in_reloc (fixP->fx_subsy);
2267 if (!fixP->fx_bit_fixP && !fixP->fx_no_overflow && fixP->fx_size != 0)
2269 if (fixP->fx_size < sizeof (valueT))
2274 mask--; /* Set all bits to one. */
2275 mask <<= fixP->fx_size * 8 - (fixP->fx_signed ? 1 : 0);
2276 if ((add_number & mask) != 0 && (add_number & mask) != mask)
2278 char buf[50], buf2[50];
2279 sprint_value (buf, fragP->fr_address + fixP->fx_where);
2280 if (add_number > 1000)
2281 sprint_value (buf2, add_number);
2283 sprintf (buf2, "%ld", (long) add_number);
2284 as_bad_where (fixP->fx_file, fixP->fx_line,
2285 _("value of %s too large for field of %d bytes at %s"),
2286 buf2, fixP->fx_size, buf);
2287 } /* Generic error checking. */
2289 #ifdef WARN_SIGNED_OVERFLOW_WORD
2290 /* Warn if a .word value is too large when treated as a signed
2291 number. We already know it is not too negative. This is to
2292 catch over-large switches generated by gcc on the 68k. */
2293 if (!flag_signed_overflow_ok
2294 && fixP->fx_size == 2
2295 && add_number > 0x7fff)
2296 as_bad_where (fixP->fx_file, fixP->fx_line,
2297 _("signed .word overflow; switch may be too large; %ld at 0x%lx"),
2299 (long) (fragP->fr_address + fixP->fx_where));
2301 } /* Not a bit fix. */
2303 #ifdef TC_VALIDATE_FIX
2304 skip: ATTRIBUTE_UNUSED_LABEL
2308 fprintf (stderr, "result:\n");
2311 } /* For each fixS in this segment. */
2313 TC_ADJUST_RELOC_COUNT (fixP, seg_reloc_count);
2314 return seg_reloc_count;
2318 number_to_chars_bigendian (char *buf, valueT val, int n)
2324 buf[n] = val & 0xff;
2330 number_to_chars_littleendian (char *buf, valueT val, int n)
2336 *buf++ = val & 0xff;
2342 write_print_statistics (FILE *file)
2344 fprintf (file, "fixups: %d\n", n_fixups);
2347 /* For debugging. */
2348 extern int indent_level;
2351 print_fixup (fixS *fixp)
2354 fprintf (stderr, "fix %lx %s:%d", (long) fixp, fixp->fx_file, fixp->fx_line);
2356 fprintf (stderr, " pcrel");
2357 if (fixp->fx_pcrel_adjust)
2358 fprintf (stderr, " pcrel_adjust=%d", fixp->fx_pcrel_adjust);
2359 if (fixp->fx_im_disp)
2362 fprintf (stderr, " im_disp=%d", fixp->fx_im_disp);
2364 fprintf (stderr, " im_disp");
2368 fprintf (stderr, " tcbit");
2370 fprintf (stderr, " done");
2371 fprintf (stderr, "\n size=%d frag=%lx where=%ld offset=%lx addnumber=%lx",
2372 fixp->fx_size, (long) fixp->fx_frag, (long) fixp->fx_where,
2373 (long) fixp->fx_offset, (long) fixp->fx_addnumber);
2374 fprintf (stderr, "\n %s (%d)", bfd_get_reloc_code_name (fixp->fx_r_type),
2378 fprintf (stderr, "\n +<");
2379 print_symbol_value_1 (stderr, fixp->fx_addsy);
2380 fprintf (stderr, ">");
2384 fprintf (stderr, "\n -<");
2385 print_symbol_value_1 (stderr, fixp->fx_subsy);
2386 fprintf (stderr, ">");
2388 fprintf (stderr, "\n");
2389 #ifdef TC_FIX_DATA_PRINT
2390 TC_FIX_DATA_PRINT (stderr, fixp);