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, 2006, 2007
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"
32 #ifndef TC_ADJUST_RELOC_COUNT
33 #define TC_ADJUST_RELOC_COUNT(FIX, COUNT)
36 #ifndef TC_FORCE_RELOCATION
37 #define TC_FORCE_RELOCATION(FIX) \
38 (generic_force_reloc (FIX))
41 #ifndef TC_FORCE_RELOCATION_ABS
42 #define TC_FORCE_RELOCATION_ABS(FIX) \
43 (TC_FORCE_RELOCATION (FIX))
46 #ifndef TC_FORCE_RELOCATION_LOCAL
47 #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 /* We generally attach relocs to frag chains. However, after we have
113 chained these all together into a segment, any relocs we add after
114 that must be attached to a segment. This will include relocs added
115 in md_estimate_size_for_relax, for example. */
116 static int frags_chained = 0;
120 #define RELOC_ENUM enum bfd_reloc_code_real
122 /* Create a fixS in obstack 'notes'. */
125 fix_new_internal (fragS *frag, /* Which frag? */
126 int where, /* Where in that frag? */
127 int size, /* 1, 2, or 4 usually. */
128 symbolS *add_symbol, /* X_add_symbol. */
129 symbolS *sub_symbol, /* X_op_symbol. */
130 offsetT offset, /* X_add_number. */
131 int pcrel, /* TRUE if PC-relative relocation. */
132 RELOC_ENUM r_type ATTRIBUTE_UNUSED /* Relocation type. */)
138 fixP = obstack_alloc (¬es, sizeof (fixS));
140 fixP->fx_frag = frag;
141 fixP->fx_where = where;
142 fixP->fx_size = size;
143 /* We've made fx_size a narrow field; check that it's wide enough. */
144 if (fixP->fx_size != size)
146 as_bad (_("field fx_size too small to hold %d"), size);
149 fixP->fx_addsy = add_symbol;
150 fixP->fx_subsy = sub_symbol;
151 fixP->fx_offset = offset;
152 fixP->fx_dot_value = dot_value;
153 fixP->fx_pcrel = pcrel;
154 fixP->fx_r_type = r_type;
155 fixP->fx_im_disp = 0;
156 fixP->fx_pcrel_adjust = 0;
157 fixP->fx_bit_fixP = 0;
158 fixP->fx_addnumber = 0;
162 fixP->fx_no_overflow = 0;
166 fixP->fx_cgen.insn = NULL;
167 fixP->fx_cgen.opinfo = 0;
171 TC_INIT_FIX_DATA (fixP);
174 as_where (&fixP->fx_file, &fixP->fx_line);
176 /* Usually, we want relocs sorted numerically, but while
177 comparing to older versions of gas that have relocs
178 reverse sorted, it is convenient to have this compile
179 time option. xoxorich. */
182 fixS **seg_fix_rootP = (frags_chained
183 ? &seg_info (now_seg)->fix_root
184 : &frchain_now->fix_root);
185 fixS **seg_fix_tailP = (frags_chained
186 ? &seg_info (now_seg)->fix_tail
187 : &frchain_now->fix_tail);
189 #ifdef REVERSE_SORT_RELOCS
191 fixP->fx_next = *seg_fix_rootP;
192 *seg_fix_rootP = fixP;
194 #else /* REVERSE_SORT_RELOCS */
196 fixP->fx_next = NULL;
199 (*seg_fix_tailP)->fx_next = fixP;
201 *seg_fix_rootP = fixP;
202 *seg_fix_tailP = fixP;
204 #endif /* REVERSE_SORT_RELOCS */
210 /* Create a fixup relative to a symbol (plus a constant). */
213 fix_new (fragS *frag, /* Which frag? */
214 int where, /* Where in that frag? */
215 int size, /* 1, 2, or 4 usually. */
216 symbolS *add_symbol, /* X_add_symbol. */
217 offsetT offset, /* X_add_number. */
218 int pcrel, /* TRUE if PC-relative relocation. */
219 RELOC_ENUM r_type /* Relocation type. */)
221 return fix_new_internal (frag, where, size, add_symbol,
222 (symbolS *) NULL, offset, pcrel, r_type);
225 /* Create a fixup for an expression. Currently we only support fixups
226 for difference expressions. That is itself more than most object
227 file formats support anyhow. */
230 fix_new_exp (fragS *frag, /* Which frag? */
231 int where, /* Where in that frag? */
232 int size, /* 1, 2, or 4 usually. */
233 expressionS *exp, /* Expression. */
234 int pcrel, /* TRUE if PC-relative relocation. */
235 RELOC_ENUM r_type /* Relocation type. */)
247 as_bad (_("register value used as expression"));
251 /* This comes up when _GLOBAL_OFFSET_TABLE_+(.-L0) is read, if
252 the difference expression cannot immediately be reduced. */
254 symbolS *stmp = make_expr_symbol (exp);
256 exp->X_op = O_symbol;
257 exp->X_op_symbol = 0;
258 exp->X_add_symbol = stmp;
259 exp->X_add_number = 0;
261 return fix_new_exp (frag, where, size, exp, pcrel, r_type);
265 add = exp->X_add_symbol;
266 off = exp->X_add_number;
267 r_type = BFD_RELOC_RVA;
271 sub = exp->X_add_symbol;
272 off = exp->X_add_number;
276 sub = exp->X_op_symbol;
279 add = exp->X_add_symbol;
282 off = exp->X_add_number;
286 add = make_expr_symbol (exp);
290 return fix_new_internal (frag, where, size, add, sub, off, pcrel, r_type);
293 /* Generic function to determine whether a fixup requires a relocation. */
295 generic_force_reloc (fixS *fix)
297 if (fix->fx_r_type == BFD_RELOC_VTABLE_INHERIT
298 || fix->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
301 if (fix->fx_addsy == NULL)
304 return S_FORCE_RELOC (fix->fx_addsy, fix->fx_subsy == NULL);
307 /* Append a string onto another string, bumping the pointer along. */
309 append (char **charPP, char *fromP, unsigned long length)
311 /* Don't trust memcpy() of 0 chars. */
315 memcpy (*charPP, fromP, length);
319 /* This routine records the largest alignment seen for each segment.
320 If the beginning of the segment is aligned on the worst-case
321 boundary, all of the other alignments within it will work. At
322 least one object format really uses this info. */
325 record_alignment (/* Segment to which alignment pertains. */
327 /* Alignment, as a power of 2 (e.g., 1 => 2-byte
328 boundary, 2 => 4-byte boundary, etc.) */
331 if (seg == absolute_section)
334 if ((unsigned int) align > bfd_get_section_alignment (stdoutput, seg))
335 bfd_set_section_alignment (stdoutput, seg, align);
339 get_recorded_alignment (segT seg)
341 if (seg == absolute_section)
344 return bfd_get_section_alignment (stdoutput, seg);
347 /* Reset the section indices after removing the gas created sections. */
350 renumber_sections (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *countparg)
352 int *countp = (int *) countparg;
354 sec->index = *countp;
359 chain_frchains_together_1 (segT section, struct frchain *frchp)
361 fragS dummy, *prev_frag = &dummy;
362 fixS fix_dummy, *prev_fix = &fix_dummy;
364 for (; frchp; frchp = frchp->frch_next)
366 prev_frag->fr_next = frchp->frch_root;
367 prev_frag = frchp->frch_last;
368 assert (prev_frag->fr_type != 0);
369 if (frchp->fix_root != (fixS *) NULL)
371 if (seg_info (section)->fix_root == (fixS *) NULL)
372 seg_info (section)->fix_root = frchp->fix_root;
373 prev_fix->fx_next = frchp->fix_root;
374 seg_info (section)->fix_tail = frchp->fix_tail;
375 prev_fix = frchp->fix_tail;
378 assert (prev_frag->fr_type != 0);
379 assert (prev_frag != &dummy);
380 prev_frag->fr_next = 0;
385 chain_frchains_together (bfd *abfd ATTRIBUTE_UNUSED,
387 void *xxx ATTRIBUTE_UNUSED)
389 segment_info_type *info;
391 /* BFD may have introduced its own sections without using
392 subseg_new, so it is possible that seg_info is NULL. */
393 info = seg_info (section);
394 if (info != (segment_info_type *) NULL)
395 info->frchainP->frch_last
396 = chain_frchains_together_1 (section, info->frchainP);
398 /* Now that we've chained the frags together, we must add new fixups
399 to the segment, not to the frag chain. */
404 cvt_frag_to_fill (segT sec ATTRIBUTE_UNUSED, fragS *fragP)
406 switch (fragP->fr_type)
414 HANDLE_ALIGN (fragP);
416 know (fragP->fr_next != NULL);
417 fragP->fr_offset = (fragP->fr_next->fr_address
419 - fragP->fr_fix) / fragP->fr_var;
420 if (fragP->fr_offset < 0)
422 as_bad_where (fragP->fr_file, fragP->fr_line,
423 _("attempt to .org/.space backwards? (%ld)"),
424 (long) fragP->fr_offset);
425 fragP->fr_offset = 0;
427 fragP->fr_type = rs_fill;
435 valueT value = S_GET_VALUE (fragP->fr_symbol);
438 size = output_leb128 (fragP->fr_literal + fragP->fr_fix, value,
441 fragP->fr_fix += size;
442 fragP->fr_type = rs_fill;
444 fragP->fr_offset = 0;
445 fragP->fr_symbol = NULL;
450 eh_frame_convert_frag (fragP);
454 dwarf2dbg_convert_frag (fragP);
457 case rs_machine_dependent:
458 md_convert_frag (stdoutput, sec, fragP);
460 assert (fragP->fr_next == NULL
461 || ((offsetT) (fragP->fr_next->fr_address - fragP->fr_address)
464 /* After md_convert_frag, we make the frag into a ".space 0".
465 md_convert_frag() should set up any fixSs and constants
470 #ifndef WORKING_DOT_WORD
473 struct broken_word *lie;
475 if (fragP->fr_subtype)
477 fragP->fr_fix += md_short_jump_size;
478 for (lie = (struct broken_word *) (fragP->fr_symbol);
479 lie && lie->dispfrag == fragP;
480 lie = lie->next_broken_word)
482 fragP->fr_fix += md_long_jump_size;
490 BAD_CASE (fragP->fr_type);
494 md_frag_check (fragP);
498 struct relax_seg_info
505 relax_seg (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *xxx)
507 segment_info_type *seginfo = seg_info (sec);
508 struct relax_seg_info *info = (struct relax_seg_info *) xxx;
510 if (seginfo && seginfo->frchainP
511 && relax_segment (seginfo->frchainP->frch_root, sec, info->pass))
516 size_seg (bfd *abfd, asection *sec, void *xxx ATTRIBUTE_UNUSED)
520 segment_info_type *seginfo;
522 valueT size, newsize;
524 subseg_change (sec, 0);
526 seginfo = seg_info (sec);
527 if (seginfo && seginfo->frchainP)
529 for (fragp = seginfo->frchainP->frch_root; fragp; fragp = fragp->fr_next)
530 cvt_frag_to_fill (sec, fragp);
531 for (fragp = seginfo->frchainP->frch_root;
533 fragp = fragp->fr_next)
534 /* Walk to last elt. */
536 size = fragp->fr_address + fragp->fr_fix;
541 flags = bfd_get_section_flags (abfd, sec);
543 if (size > 0 && ! seginfo->bss)
544 flags |= SEC_HAS_CONTENTS;
546 /* @@ This is just an approximation. */
547 if (seginfo && seginfo->fix_root)
551 x = bfd_set_section_flags (abfd, sec, flags);
554 newsize = md_section_align (sec, size);
555 x = bfd_set_section_size (abfd, sec, newsize);
558 /* If the size had to be rounded up, add some padding in the last
560 assert (newsize >= size);
563 fragS *last = seginfo->frchainP->frch_last;
564 fragp = seginfo->frchainP->frch_root;
565 while (fragp->fr_next != last)
566 fragp = fragp->fr_next;
567 last->fr_address = size;
568 if ((newsize - size) % fragp->fr_var == 0)
569 fragp->fr_offset += (newsize - size) / fragp->fr_var;
571 /* If we hit this abort, it's likely due to subsegs_finish not
572 providing sufficient alignment on the last frag, and the
573 machine dependent code using alignment frags with fr_var
578 #ifdef tc_frob_section
579 tc_frob_section (sec);
581 #ifdef obj_frob_section
582 obj_frob_section (sec);
588 dump_section_relocs (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, FILE *stream)
590 segment_info_type *seginfo = seg_info (sec);
591 fixS *fixp = seginfo->fix_root;
596 fprintf (stream, "sec %s relocs:\n", sec->name);
599 symbolS *s = fixp->fx_addsy;
601 fprintf (stream, " %08lx: type %d ", (unsigned long) fixp,
602 (int) fixp->fx_r_type);
604 fprintf (stream, "no sym\n");
607 print_symbol_value_1 (stream, s);
608 fprintf (stream, "\n");
610 fixp = fixp->fx_next;
614 #define dump_section_relocs(ABFD,SEC,STREAM) ((void) 0)
617 #ifndef EMIT_SECTION_SYMBOLS
618 #define EMIT_SECTION_SYMBOLS 1
621 /* This pass over fixups decides whether symbols can be replaced with
625 adjust_reloc_syms (bfd *abfd ATTRIBUTE_UNUSED,
627 void *xxx ATTRIBUTE_UNUSED)
629 segment_info_type *seginfo = seg_info (sec);
635 dump_section_relocs (abfd, sec, stderr);
637 for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next)
641 else if (fixp->fx_addsy)
647 fprintf (stderr, "\n\nadjusting fixup:\n");
651 sym = fixp->fx_addsy;
653 /* All symbols should have already been resolved at this
654 point. It is possible to see unresolved expression
655 symbols, though, since they are not in the regular symbol
657 resolve_symbol_value (sym);
659 if (fixp->fx_subsy != NULL)
660 resolve_symbol_value (fixp->fx_subsy);
662 /* If this symbol is equated to an undefined or common symbol,
663 convert the fixup to being against that symbol. */
664 if (symbol_equated_reloc_p (sym)
665 || S_IS_WEAKREFR (sym))
667 fixp->fx_offset += symbol_get_value_expression (sym)->X_add_number;
668 sym = symbol_get_value_expression (sym)->X_add_symbol;
669 fixp->fx_addsy = sym;
672 if (symbol_mri_common_p (sym))
674 /* These symbols are handled specially in fixup_segment. */
678 /* If the symbol is undefined, common, weak, or global (ELF
679 shared libs), we can't replace it with the section symbol. */
680 if (S_FORCE_RELOC (fixp->fx_addsy, 1))
683 /* Is there some other (target cpu dependent) reason we can't adjust
684 this one? (E.g. relocations involving function addresses on
686 #ifdef tc_fix_adjustable
687 if (! tc_fix_adjustable (fixp))
691 /* Since we're reducing to section symbols, don't attempt to reduce
692 anything that's already using one. */
693 if (symbol_section_p (sym))
696 symsec = S_GET_SEGMENT (sym);
700 if (bfd_is_abs_section (symsec))
702 /* The fixup_segment routine normally will not use this
703 symbol in a relocation. */
707 /* Don't try to reduce relocs which refer to non-local symbols
708 in .linkonce sections. It can lead to confusion when a
709 debugging section refers to a .linkonce section. I hope
710 this will always be correct. */
711 if (symsec != sec && ! S_IS_LOCAL (sym))
713 if ((symsec->flags & SEC_LINK_ONCE) != 0
715 /* The GNU toolchain uses an extension for ELF: a
716 section beginning with the magic string
717 .gnu.linkonce is a linkonce section. */
718 && strncmp (segment_name (symsec), ".gnu.linkonce",
719 sizeof ".gnu.linkonce" - 1) == 0))
723 /* Never adjust a reloc against local symbol in a merge section
724 with non-zero addend. */
725 if ((symsec->flags & SEC_MERGE) != 0
726 && (fixp->fx_offset != 0 || fixp->fx_subsy != NULL))
729 /* Never adjust a reloc against TLS local symbol. */
730 if ((symsec->flags & SEC_THREAD_LOCAL) != 0)
733 /* We refetch the segment when calling section_symbol, rather
734 than using symsec, because S_GET_VALUE may wind up changing
735 the section when it calls resolve_symbol_value. */
736 fixp->fx_offset += S_GET_VALUE (sym);
737 fixp->fx_addsy = section_symbol (S_GET_SEGMENT (sym));
739 fprintf (stderr, "\nadjusted fixup:\n");
744 dump_section_relocs (abfd, sec, stderr);
749 Go through all the fixS's in a segment and see which ones can be
750 handled now. (These consist of fixS where we have since discovered
751 the value of a symbol, or the address of the frag involved.)
752 For each one, call md_apply_fix to put the fix into the frag data.
754 Result is a count of how many relocation structs will be needed to
755 handle the remaining fixS's that we couldn't completely handle here.
756 These will be output later by emit_relocations(). */
759 fixup_segment (fixS *fixP, segT this_segment)
761 long seg_reloc_count = 0;
764 segT add_symbol_segment = absolute_section;
766 if (fixP != NULL && abs_section_sym == NULL)
767 abs_section_sym = section_symbol (absolute_section);
769 /* If the linker is doing the relaxing, we must not do any fixups.
771 Well, strictly speaking that's not true -- we could do any that
772 are PC-relative and don't cross regions that could change size.
773 And for the i960 we might be able to turn callx/callj into bal
774 anyways in cases where we know the maximum displacement. */
775 if (linkrelax && TC_LINKRELAX_FIXUP (this_segment))
777 for (; fixP; fixP = fixP->fx_next)
780 if (fixP->fx_addsy == NULL)
782 /* There was no symbol required by this relocation.
783 However, BFD doesn't really handle relocations
784 without symbols well. So fake up a local symbol in
785 the absolute section. */
786 fixP->fx_addsy = abs_section_sym;
788 symbol_mark_used_in_reloc (fixP->fx_addsy);
789 if (fixP->fx_subsy != NULL)
790 symbol_mark_used_in_reloc (fixP->fx_subsy);
793 TC_ADJUST_RELOC_COUNT (fixP, seg_reloc_count);
794 return seg_reloc_count;
797 for (; fixP; fixP = fixP->fx_next)
800 fprintf (stderr, "\nprocessing fixup:\n");
804 fragP = fixP->fx_frag;
806 #ifdef TC_VALIDATE_FIX
807 TC_VALIDATE_FIX (fixP, this_segment, skip);
809 add_number = fixP->fx_offset;
811 if (fixP->fx_addsy != NULL
812 && symbol_mri_common_p (fixP->fx_addsy))
814 add_number += S_GET_VALUE (fixP->fx_addsy);
815 fixP->fx_offset = add_number;
817 = symbol_get_value_expression (fixP->fx_addsy)->X_add_symbol;
820 if (fixP->fx_addsy != NULL)
821 add_symbol_segment = S_GET_SEGMENT (fixP->fx_addsy);
823 if (fixP->fx_subsy != NULL)
825 segT sub_symbol_segment;
826 resolve_symbol_value (fixP->fx_subsy);
827 sub_symbol_segment = S_GET_SEGMENT (fixP->fx_subsy);
828 if (fixP->fx_addsy != NULL
829 && sub_symbol_segment == add_symbol_segment
830 && !TC_FORCE_RELOCATION_SUB_SAME (fixP, add_symbol_segment))
832 add_number += S_GET_VALUE (fixP->fx_addsy);
833 add_number -= S_GET_VALUE (fixP->fx_subsy);
834 fixP->fx_offset = add_number;
835 fixP->fx_addsy = NULL;
836 fixP->fx_subsy = NULL;
838 /* See the comment below about 68k weirdness. */
842 else if (sub_symbol_segment == absolute_section
843 && !TC_FORCE_RELOCATION_SUB_ABS (fixP))
845 add_number -= S_GET_VALUE (fixP->fx_subsy);
846 fixP->fx_offset = add_number;
847 fixP->fx_subsy = NULL;
849 else if (sub_symbol_segment == this_segment
850 && !TC_FORCE_RELOCATION_SUB_LOCAL (fixP))
852 add_number -= S_GET_VALUE (fixP->fx_subsy);
853 fixP->fx_offset = (add_number + fixP->fx_dot_value
854 + fixP->fx_frag->fr_address);
856 /* Make it pc-relative. If the back-end code has not
857 selected a pc-relative reloc, cancel the adjustment
858 we do later on all pc-relative relocs. */
861 /* Do this for m68k even if it's already described
862 as pc-relative. On the m68k, an operand of
863 "pc@(foo-.-2)" should address "foo" in a
868 add_number += MD_PCREL_FROM_SECTION (fixP, this_segment);
869 fixP->fx_subsy = NULL;
872 else if (!TC_VALIDATE_FIX_SUB (fixP))
874 as_bad_where (fixP->fx_file, fixP->fx_line,
875 _("can't resolve `%s' {%s section} - `%s' {%s section}"),
876 fixP->fx_addsy ? S_GET_NAME (fixP->fx_addsy) : "0",
877 segment_name (add_symbol_segment),
878 S_GET_NAME (fixP->fx_subsy),
879 segment_name (sub_symbol_segment));
885 if (add_symbol_segment == this_segment
886 && !TC_FORCE_RELOCATION_LOCAL (fixP))
888 /* This fixup was made when the symbol's segment was
889 SEG_UNKNOWN, but it is now in the local segment.
890 So we know how to do the address without relocation. */
891 add_number += S_GET_VALUE (fixP->fx_addsy);
892 fixP->fx_offset = add_number;
894 add_number -= MD_PCREL_FROM_SECTION (fixP, this_segment);
895 fixP->fx_addsy = NULL;
898 else if (add_symbol_segment == absolute_section
899 && !TC_FORCE_RELOCATION_ABS (fixP))
901 add_number += S_GET_VALUE (fixP->fx_addsy);
902 fixP->fx_offset = add_number;
903 fixP->fx_addsy = NULL;
905 else if (add_symbol_segment != undefined_section
906 && ! bfd_is_com_section (add_symbol_segment)
907 && MD_APPLY_SYM_VALUE (fixP))
908 add_number += S_GET_VALUE (fixP->fx_addsy);
913 add_number -= MD_PCREL_FROM_SECTION (fixP, this_segment);
914 if (!fixP->fx_done && fixP->fx_addsy == NULL)
916 /* There was no symbol required by this relocation.
917 However, BFD doesn't really handle relocations
918 without symbols well. So fake up a local symbol in
919 the absolute section. */
920 fixP->fx_addsy = abs_section_sym;
925 md_apply_fix (fixP, &add_number, this_segment);
930 if (fixP->fx_addsy == NULL)
931 fixP->fx_addsy = abs_section_sym;
932 symbol_mark_used_in_reloc (fixP->fx_addsy);
933 if (fixP->fx_subsy != NULL)
934 symbol_mark_used_in_reloc (fixP->fx_subsy);
937 if (!fixP->fx_bit_fixP && !fixP->fx_no_overflow && fixP->fx_size != 0)
939 if (fixP->fx_size < sizeof (valueT))
944 mask--; /* Set all bits to one. */
945 mask <<= fixP->fx_size * 8 - (fixP->fx_signed ? 1 : 0);
946 if ((add_number & mask) != 0 && (add_number & mask) != mask)
948 char buf[50], buf2[50];
949 sprint_value (buf, fragP->fr_address + fixP->fx_where);
950 if (add_number > 1000)
951 sprint_value (buf2, add_number);
953 sprintf (buf2, "%ld", (long) add_number);
954 as_bad_where (fixP->fx_file, fixP->fx_line,
955 _("value of %s too large for field of %d bytes at %s"),
956 buf2, fixP->fx_size, buf);
957 } /* Generic error checking. */
959 #ifdef WARN_SIGNED_OVERFLOW_WORD
960 /* Warn if a .word value is too large when treated as a signed
961 number. We already know it is not too negative. This is to
962 catch over-large switches generated by gcc on the 68k. */
963 if (!flag_signed_overflow_ok
964 && fixP->fx_size == 2
965 && add_number > 0x7fff)
966 as_bad_where (fixP->fx_file, fixP->fx_line,
967 _("signed .word overflow; switch may be too large; %ld at 0x%lx"),
969 (long) (fragP->fr_address + fixP->fx_where));
971 } /* Not a bit fix. */
973 #ifdef TC_VALIDATE_FIX
974 skip: ATTRIBUTE_UNUSED_LABEL
978 fprintf (stderr, "result:\n");
981 } /* For each fixS in this segment. */
983 TC_ADJUST_RELOC_COUNT (fixP, seg_reloc_count);
984 return seg_reloc_count;
988 fix_segment (bfd *abfd ATTRIBUTE_UNUSED,
990 void *xxx ATTRIBUTE_UNUSED)
992 segment_info_type *seginfo = seg_info (sec);
994 fixup_segment (seginfo->fix_root, sec);
998 write_relocs (bfd *abfd, asection *sec, void *xxx ATTRIBUTE_UNUSED)
1000 segment_info_type *seginfo = seg_info (sec);
1007 /* If seginfo is NULL, we did not create this section; don't do
1008 anything with it. */
1009 if (seginfo == NULL)
1013 for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next)
1016 #ifndef RELOC_EXPANSION_POSSIBLE
1017 /* Set up reloc information as well. */
1018 relocs = xcalloc (n, sizeof (arelent *));
1021 for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next)
1024 bfd_reloc_status_type s;
1033 /* If this is an undefined symbol which was equated to another
1034 symbol, then generate the reloc against the latter symbol
1035 rather than the former. */
1036 sym = fixp->fx_addsy;
1037 while (symbol_equated_reloc_p (sym))
1041 /* We must avoid looping, as that can occur with a badly
1043 n = symbol_get_value_expression (sym)->X_add_symbol;
1046 fixp->fx_offset += symbol_get_value_expression (sym)->X_add_number;
1049 fixp->fx_addsy = sym;
1051 reloc = tc_gen_reloc (sec, fixp);
1059 This test is triggered inappropriately for the SH:
1060 if (fixp->fx_where + fixp->fx_size
1061 > fixp->fx_frag->fr_fix + fixp->fx_frag->fr_offset)
1065 s = bfd_install_relocation (stdoutput, reloc,
1066 fixp->fx_frag->fr_literal,
1067 fixp->fx_frag->fr_address,
1073 case bfd_reloc_overflow:
1074 as_bad_where (fixp->fx_file, fixp->fx_line,
1075 _("relocation overflow"));
1077 case bfd_reloc_outofrange:
1078 as_bad_where (fixp->fx_file, fixp->fx_line,
1079 _("relocation out of range"));
1082 as_fatal (_("%s:%u: bad return from bfd_install_relocation: %x"),
1083 fixp->fx_file, fixp->fx_line, s);
1085 relocs[i++] = reloc;
1088 n = n * MAX_RELOC_EXPANSION;
1089 /* Set up reloc information as well. */
1090 relocs = xcalloc (n, sizeof (arelent *));
1093 for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next)
1096 bfd_reloc_status_type s;
1106 /* If this is an undefined symbol which was equated to another
1107 symbol, then generate the reloc against the latter symbol
1108 rather than the former. */
1109 sym = fixp->fx_addsy;
1110 while (symbol_equated_reloc_p (sym))
1114 /* We must avoid looping, as that can occur with a badly
1116 n = symbol_get_value_expression (sym)->X_add_symbol;
1119 fixp->fx_offset += symbol_get_value_expression (sym)->X_add_number;
1122 fixp->fx_addsy = sym;
1124 reloc = tc_gen_reloc (sec, fixp);
1126 for (j = 0; reloc[j]; j++)
1128 relocs[i++] = reloc[j];
1131 if (fixp->fx_where + fixp->fx_size
1132 > fixp->fx_frag->fr_fix + fixp->fx_frag->fr_offset)
1133 as_bad_where (fixp->fx_file, fixp->fx_line,
1134 _("internal error: fixup not contained within frag"));
1135 for (j = 0; reloc[j]; j++)
1137 s = bfd_install_relocation (stdoutput, reloc[j],
1138 fixp->fx_frag->fr_literal,
1139 fixp->fx_frag->fr_address,
1145 case bfd_reloc_overflow:
1146 as_bad_where (fixp->fx_file, fixp->fx_line,
1147 _("relocation overflow"));
1149 case bfd_reloc_outofrange:
1150 as_bad_where (fixp->fx_file, fixp->fx_line,
1151 _("relocation out of range"));
1154 as_fatal (_("%s:%u: bad return from bfd_install_relocation: %x"),
1155 fixp->fx_file, fixp->fx_line, s);
1164 unsigned int i, j, nsyms;
1166 sympp = bfd_get_outsymbols (stdoutput);
1167 nsyms = bfd_get_symcount (stdoutput);
1168 for (i = 0; i < n; i++)
1169 if (((*relocs[i]->sym_ptr_ptr)->flags & BSF_SECTION_SYM) == 0)
1171 for (j = 0; j < nsyms; j++)
1172 if (sympp[j] == *relocs[i]->sym_ptr_ptr)
1181 bfd_set_reloc (stdoutput, sec, relocs, n);
1183 bfd_set_section_flags (abfd, sec,
1184 (bfd_get_section_flags (abfd, sec)
1185 & (flagword) ~SEC_RELOC));
1187 #ifdef SET_SECTION_RELOCS
1188 SET_SECTION_RELOCS (sec, relocs, n);
1196 fprintf (stderr, "relocs for sec %s\n", sec->name);
1197 for (i = 0; i < n; i++)
1200 s = *r->sym_ptr_ptr;
1201 fprintf (stderr, " reloc %2d @%p off %4lx : sym %-10s addend %lx\n",
1202 i, r, (unsigned long)r->address, s->name, (unsigned long)r->addend);
1209 write_contents (bfd *abfd ATTRIBUTE_UNUSED,
1211 void *xxx ATTRIBUTE_UNUSED)
1213 segment_info_type *seginfo = seg_info (sec);
1214 addressT offset = 0;
1217 /* Write out the frags. */
1219 || !(bfd_get_section_flags (abfd, sec) & SEC_HAS_CONTENTS))
1222 for (f = seginfo->frchainP->frch_root;
1231 assert (f->fr_type == rs_fill);
1234 x = bfd_set_section_contents (stdoutput, sec,
1235 f->fr_literal, (file_ptr) offset,
1236 (bfd_size_type) f->fr_fix);
1238 as_fatal (_("can't write %s: %s"), stdoutput->filename,
1239 bfd_errmsg (bfd_get_error ()));
1240 offset += f->fr_fix;
1242 fill_literal = f->fr_literal + f->fr_fix;
1243 fill_size = f->fr_var;
1244 count = f->fr_offset;
1245 assert (count >= 0);
1246 if (fill_size && count)
1249 if (fill_size > sizeof (buf))
1251 /* Do it the old way. Can this ever happen? */
1254 x = bfd_set_section_contents (stdoutput, sec,
1257 (bfd_size_type) fill_size);
1259 as_fatal (_("can't write %s: %s"), stdoutput->filename,
1260 bfd_errmsg (bfd_get_error ()));
1261 offset += fill_size;
1266 /* Build a buffer full of fill objects and output it as
1267 often as necessary. This saves on the overhead of
1268 potentially lots of bfd_set_section_contents calls. */
1272 n_per_buf = sizeof (buf);
1273 memset (buf, *fill_literal, n_per_buf);
1278 n_per_buf = sizeof (buf) / fill_size;
1279 for (i = n_per_buf, bufp = buf; i; i--, bufp += fill_size)
1280 memcpy (bufp, fill_literal, fill_size);
1282 for (; count > 0; count -= n_per_buf)
1284 n_per_buf = n_per_buf > count ? count : n_per_buf;
1285 x = bfd_set_section_contents
1286 (stdoutput, sec, buf, (file_ptr) offset,
1287 (bfd_size_type) n_per_buf * fill_size);
1289 as_fatal (_("cannot write to output file"));
1290 offset += n_per_buf * fill_size;
1298 merge_data_into_text (void)
1300 seg_info (text_section)->frchainP->frch_last->fr_next =
1301 seg_info (data_section)->frchainP->frch_root;
1302 seg_info (text_section)->frchainP->frch_last =
1303 seg_info (data_section)->frchainP->frch_last;
1304 seg_info (data_section)->frchainP = 0;
1315 /* Count symbols. We can't rely on a count made by the loop in
1316 write_object_file, because *_frob_file may add a new symbol or
1319 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
1325 bfd_size_type amt = (bfd_size_type) nsyms * sizeof (asymbol *);
1327 asympp = bfd_alloc (stdoutput, amt);
1328 symp = symbol_rootP;
1329 for (i = 0; i < nsyms; i++, symp = symbol_next (symp))
1331 asympp[i] = symbol_get_bfdsym (symp);
1332 symbol_mark_written (symp);
1337 result = bfd_set_symtab (stdoutput, asympp, nsyms);
1339 symbol_table_frozen = 1;
1342 /* Finish the subsegments. After every sub-segment, we fake an
1343 ".align ...". This conforms to BSD4.2 brane-damage. We then fake
1344 ".fill 0" because that is the kind of frag that requires least
1345 thought. ".align" frags like to have a following frag since that
1346 makes calculating their intended length trivial. */
1348 #ifndef SUB_SEGMENT_ALIGN
1350 /* The last subsegment gets an alignment corresponding to the alignment
1351 of the section. This allows proper nop-filling at the end of
1352 code-bearing sections. */
1353 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) \
1354 (!(FRCHAIN)->frch_next ? get_recorded_alignment (SEG) : 0)
1356 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) 0
1361 subsegs_finish (void)
1363 struct frchain *frchainP;
1366 for (s = stdoutput->sections; s; s = s->next)
1368 segment_info_type *seginfo = seg_info (s);
1372 for (frchainP = seginfo->frchainP;
1374 frchainP = frchainP->frch_next)
1378 subseg_set (s, frchainP->frch_subseg);
1380 /* This now gets called even if we had errors. In that case,
1381 any alignment is meaningless, and, moreover, will look weird
1382 if we are generating a listing. */
1385 alignment = SUB_SEGMENT_ALIGN (now_seg, frchainP);
1386 if ((bfd_get_section_flags (now_seg->owner, now_seg) & SEC_MERGE)
1387 && now_seg->entsize)
1389 unsigned int entsize = now_seg->entsize;
1392 while ((entsize & 1) == 0)
1397 if (entalign > alignment)
1398 alignment = entalign;
1402 if (subseg_text_p (now_seg))
1403 frag_align_code (alignment, 0);
1405 frag_align (alignment, 0, 0);
1407 /* frag_align will have left a new frag.
1408 Use this last frag for an empty ".fill".
1410 For this segment ...
1411 Create a last frag. Do not leave a "being filled in frag". */
1412 frag_wane (frag_now);
1413 frag_now->fr_fix = 0;
1414 know (frag_now->fr_next == NULL);
1419 /* Write the object file. */
1422 write_object_file (void)
1424 struct relax_seg_info rsi;
1425 #ifndef WORKING_DOT_WORD
1426 fragS *fragP; /* Track along all frags. */
1429 /* Do we really want to write it? */
1431 int n_warns, n_errs;
1432 n_warns = had_warnings ();
1433 n_errs = had_errors ();
1434 /* The -Z flag indicates that an object file should be generated,
1435 regardless of warnings and errors. */
1436 if (flag_always_generate_output)
1438 if (n_warns || n_errs)
1439 as_warn (_("%d error%s, %d warning%s, generating bad object file"),
1440 n_errs, n_errs == 1 ? "" : "s",
1441 n_warns, n_warns == 1 ? "" : "s");
1446 as_fatal (_("%d error%s, %d warning%s, no object file generated"),
1447 n_errs, n_errs == 1 ? "" : "s",
1448 n_warns, n_warns == 1 ? "" : "s");
1453 /* Under VMS we try to be compatible with VAX-11 "C". Thus, we call
1454 a routine to check for the definition of the procedure "_main",
1455 and if so -- fix it up so that it can be program entry point. */
1456 vms_check_for_main ();
1457 #endif /* OBJ_VMS */
1459 /* From now on, we don't care about sub-segments. Build one frag chain
1460 for each segment. Linked thru fr_next. */
1462 /* Remove the sections created by gas for its own purposes. */
1466 bfd_section_list_remove (stdoutput, reg_section);
1467 bfd_section_list_remove (stdoutput, expr_section);
1468 stdoutput->section_count -= 2;
1470 bfd_map_over_sections (stdoutput, renumber_sections, &i);
1473 bfd_map_over_sections (stdoutput, chain_frchains_together, (char *) 0);
1475 /* We have two segments. If user gave -R flag, then we must put the
1476 data frags into the text segment. Do this before relaxing so
1477 we know to take advantage of -R and make shorter addresses. */
1478 if (flag_readonly_data_in_text)
1480 merge_data_into_text ();
1486 #ifndef WORKING_DOT_WORD
1487 /* We need to reset the markers in the broken word list and
1488 associated frags between calls to relax_segment (via
1489 relax_seg). Since the broken word list is global, we do it
1490 once per round, rather than locally in relax_segment for each
1492 struct broken_word *brokp;
1494 for (brokp = broken_words;
1495 brokp != (struct broken_word *) NULL;
1496 brokp = brokp->next_broken_word)
1500 if (brokp->dispfrag != (fragS *) NULL
1501 && brokp->dispfrag->fr_type == rs_broken_word)
1502 brokp->dispfrag->fr_subtype = 0;
1507 bfd_map_over_sections (stdoutput, relax_seg, &rsi);
1513 /* Note - Most ports will use the default value of
1514 TC_FINALIZE_SYMS_BEFORE_SIZE_SEG, which 1. This will force
1515 local symbols to be resolved, removing their frag information.
1516 Some ports however, will not have finished relaxing all of
1517 their frags and will still need the local symbol frag
1518 information. These ports can set
1519 TC_FINALIZE_SYMS_BEFORE_SIZE_SEG to 0. */
1520 finalize_syms = TC_FINALIZE_SYMS_BEFORE_SIZE_SEG;
1522 bfd_map_over_sections (stdoutput, size_seg, (char *) 0);
1524 /* Relaxation has completed. Freeze all syms. */
1527 #ifdef md_post_relax_hook
1531 #ifndef WORKING_DOT_WORD
1533 struct broken_word *lie;
1534 struct broken_word **prevP;
1536 prevP = &broken_words;
1537 for (lie = broken_words; lie; lie = lie->next_broken_word)
1542 subseg_change (lie->seg, lie->subseg);
1543 exp.X_op = O_subtract;
1544 exp.X_add_symbol = lie->add;
1545 exp.X_op_symbol = lie->sub;
1546 exp.X_add_number = lie->addnum;
1547 #ifdef TC_CONS_FIX_NEW
1548 TC_CONS_FIX_NEW (lie->frag,
1549 lie->word_goes_here - lie->frag->fr_literal,
1552 fix_new_exp (lie->frag,
1553 lie->word_goes_here - lie->frag->fr_literal,
1554 2, &exp, 0, BFD_RELOC_16);
1556 *prevP = lie->next_broken_word;
1559 prevP = &(lie->next_broken_word);
1561 for (lie = broken_words; lie;)
1563 struct broken_word *untruth;
1565 addressT table_addr;
1566 addressT from_addr, to_addr;
1569 subseg_change (lie->seg, lie->subseg);
1570 fragP = lie->dispfrag;
1572 /* Find out how many broken_words go here. */
1575 untruth && untruth->dispfrag == fragP;
1576 untruth = untruth->next_broken_word)
1577 if (untruth->added == 1)
1580 table_ptr = lie->dispfrag->fr_opcode;
1581 table_addr = (lie->dispfrag->fr_address
1582 + (table_ptr - lie->dispfrag->fr_literal));
1583 /* Create the jump around the long jumps. This is a short
1584 jump from table_ptr+0 to table_ptr+n*long_jump_size. */
1585 from_addr = table_addr;
1586 to_addr = table_addr + md_short_jump_size + n * md_long_jump_size;
1587 md_create_short_jump (table_ptr, from_addr, to_addr, lie->dispfrag,
1589 table_ptr += md_short_jump_size;
1590 table_addr += md_short_jump_size;
1593 lie && lie->dispfrag == fragP;
1594 m++, lie = lie->next_broken_word)
1596 if (lie->added == 2)
1598 /* Patch the jump table. */
1599 /* This is the offset from ??? to table_ptr+0. */
1600 to_addr = table_addr - S_GET_VALUE (lie->sub);
1601 #ifdef TC_CHECK_ADJUSTED_BROKEN_DOT_WORD
1602 TC_CHECK_ADJUSTED_BROKEN_DOT_WORD (to_addr, lie);
1604 md_number_to_chars (lie->word_goes_here, to_addr, 2);
1605 for (untruth = lie->next_broken_word;
1606 untruth && untruth->dispfrag == fragP;
1607 untruth = untruth->next_broken_word)
1609 if (untruth->use_jump == lie)
1610 md_number_to_chars (untruth->word_goes_here, to_addr, 2);
1613 /* Install the long jump. */
1614 /* This is a long jump from table_ptr+0 to the final target. */
1615 from_addr = table_addr;
1616 to_addr = S_GET_VALUE (lie->add) + lie->addnum;
1617 md_create_long_jump (table_ptr, from_addr, to_addr, lie->dispfrag,
1619 table_ptr += md_long_jump_size;
1620 table_addr += md_long_jump_size;
1624 #endif /* not WORKING_DOT_WORD */
1626 /* Resolve symbol values. This needs to be done before processing
1632 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
1633 resolve_symbol_value (symp);
1635 resolve_local_symbol_values ();
1639 #ifdef tc_frob_file_before_adjust
1640 tc_frob_file_before_adjust ();
1642 #ifdef obj_frob_file_before_adjust
1643 obj_frob_file_before_adjust ();
1646 bfd_map_over_sections (stdoutput, adjust_reloc_syms, (char *) 0);
1648 #ifdef tc_frob_file_before_fix
1649 tc_frob_file_before_fix ();
1651 #ifdef obj_frob_file_before_fix
1652 obj_frob_file_before_fix ();
1655 bfd_map_over_sections (stdoutput, fix_segment, (char *) 0);
1657 /* Set up symbol table, and write it out. */
1661 bfd_boolean skip_next_symbol = FALSE;
1663 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
1668 if (skip_next_symbol)
1670 /* Don't do anything besides moving the value of the
1671 symbol from the GAS value-field to the BFD value-field. */
1672 symbol_get_bfdsym (symp)->value = S_GET_VALUE (symp);
1673 skip_next_symbol = FALSE;
1677 if (symbol_mri_common_p (symp))
1679 if (S_IS_EXTERNAL (symp))
1680 as_bad (_("%s: global symbols not supported in common sections"),
1682 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
1686 name = S_GET_NAME (symp);
1690 decode_local_label_name ((char *) S_GET_NAME (symp));
1691 /* They only differ if `name' is a fb or dollar local
1693 if (name2 != name && ! S_IS_DEFINED (symp))
1694 as_bad (_("local label `%s' is not defined"), name2);
1697 /* Do it again, because adjust_reloc_syms might introduce
1698 more symbols. They'll probably only be section symbols,
1699 but they'll still need to have the values computed. */
1700 resolve_symbol_value (symp);
1702 /* Skip symbols which were equated to undefined or common
1704 if (symbol_equated_reloc_p (symp)
1705 || S_IS_WEAKREFR (symp))
1707 const char *name = S_GET_NAME (symp);
1708 if (S_IS_COMMON (symp)
1709 && !TC_FAKE_LABEL (name)
1710 && !S_IS_WEAKREFR (symp)
1711 && (!S_IS_EXTERNAL (symp) || S_IS_LOCAL (symp)))
1713 expressionS *e = symbol_get_value_expression (symp);
1714 as_bad (_("Local symbol `%s' can't be equated to common symbol `%s'"),
1715 name, S_GET_NAME (e->X_add_symbol));
1717 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
1721 #ifdef obj_frob_symbol
1722 obj_frob_symbol (symp, punt);
1724 #ifdef tc_frob_symbol
1725 if (! punt || symbol_used_in_reloc_p (symp))
1726 tc_frob_symbol (symp, punt);
1729 /* If we don't want to keep this symbol, splice it out of
1730 the chain now. If EMIT_SECTION_SYMBOLS is 0, we never
1731 want section symbols. Otherwise, we skip local symbols
1732 and symbols that the frob_symbol macros told us to punt,
1733 but we keep such symbols if they are used in relocs. */
1734 if (symp == abs_section_sym
1735 || (! EMIT_SECTION_SYMBOLS
1736 && symbol_section_p (symp))
1737 /* Note that S_IS_EXTERNAL and S_IS_LOCAL are not always
1738 opposites. Sometimes the former checks flags and the
1739 latter examines the name... */
1740 || (!S_IS_EXTERNAL (symp)
1741 && (punt || S_IS_LOCAL (symp) ||
1742 (S_IS_WEAKREFD (symp) && ! symbol_used_p (symp)))
1743 && ! symbol_used_in_reloc_p (symp)))
1745 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
1747 /* After symbol_remove, symbol_next(symp) still returns
1748 the one that came after it in the chain. So we don't
1749 need to do any extra cleanup work here. */
1753 /* Make sure we really got a value for the symbol. */
1754 if (! symbol_resolved_p (symp))
1756 as_bad (_("can't resolve value for symbol `%s'"),
1758 symbol_mark_resolved (symp);
1761 /* Set the value into the BFD symbol. Up til now the value
1762 has only been kept in the gas symbolS struct. */
1763 symbol_get_bfdsym (symp)->value = S_GET_VALUE (symp);
1765 /* A warning construct is a warning symbol followed by the
1766 symbol warned about. Don't let anything object-format or
1767 target-specific muck with it; it's ready for output. */
1768 if (symbol_get_bfdsym (symp)->flags & BSF_WARNING)
1769 skip_next_symbol = TRUE;
1775 /* Now do any format-specific adjustments to the symbol table, such
1776 as adding file symbols. */
1777 #ifdef tc_adjust_symtab
1778 tc_adjust_symtab ();
1780 #ifdef obj_adjust_symtab
1781 obj_adjust_symtab ();
1784 /* Now that all the sizes are known, and contents correct, we can
1785 start writing to the file. */
1788 /* If *_frob_file changes the symbol value at this point, it is
1789 responsible for moving the changed value into symp->bsym->value
1790 as well. Hopefully all symbol value changing can be done in
1795 #ifdef obj_frob_file
1799 bfd_map_over_sections (stdoutput, write_relocs, (char *) 0);
1801 #ifdef tc_frob_file_after_relocs
1802 tc_frob_file_after_relocs ();
1804 #ifdef obj_frob_file_after_relocs
1805 obj_frob_file_after_relocs ();
1808 bfd_map_over_sections (stdoutput, write_contents, (char *) 0);
1811 #ifdef TC_GENERIC_RELAX_TABLE
1812 /* Relax a fragment by scanning TC_GENERIC_RELAX_TABLE. */
1815 relax_frag (segT segment, fragS *fragP, long stretch)
1817 const relax_typeS *this_type;
1818 const relax_typeS *start_type;
1819 relax_substateT next_state;
1820 relax_substateT this_state;
1826 const relax_typeS *table;
1828 target = fragP->fr_offset;
1829 address = fragP->fr_address;
1830 table = TC_GENERIC_RELAX_TABLE;
1831 this_state = fragP->fr_subtype;
1832 start_type = this_type = table + this_state;
1833 symbolP = fragP->fr_symbol;
1839 sym_frag = symbol_get_frag (symbolP);
1841 #ifndef DIFF_EXPR_OK
1842 know (sym_frag != NULL);
1844 know (S_GET_SEGMENT (symbolP) != absolute_section
1845 || sym_frag == &zero_address_frag);
1846 target += S_GET_VALUE (symbolP);
1848 /* If frag has yet to be reached on this pass,
1849 assume it will move by STRETCH just as we did.
1850 If this is not so, it will be because some frag
1851 between grows, and that will force another pass. */
1854 && sym_frag->relax_marker != fragP->relax_marker
1855 && S_GET_SEGMENT (symbolP) == segment)
1861 aim = target - address - fragP->fr_fix;
1862 #ifdef TC_PCREL_ADJUST
1863 /* Currently only the ns32k family needs this. */
1864 aim += TC_PCREL_ADJUST (fragP);
1867 #ifdef md_prepare_relax_scan
1868 /* Formerly called M68K_AIM_KLUDGE. */
1869 md_prepare_relax_scan (fragP, address, aim, this_state, this_type);
1874 /* Look backwards. */
1875 for (next_state = this_type->rlx_more; next_state;)
1876 if (aim >= this_type->rlx_backward)
1880 /* Grow to next state. */
1881 this_state = next_state;
1882 this_type = table + this_state;
1883 next_state = this_type->rlx_more;
1888 /* Look forwards. */
1889 for (next_state = this_type->rlx_more; next_state;)
1890 if (aim <= this_type->rlx_forward)
1894 /* Grow to next state. */
1895 this_state = next_state;
1896 this_type = table + this_state;
1897 next_state = this_type->rlx_more;
1901 growth = this_type->rlx_length - start_type->rlx_length;
1903 fragP->fr_subtype = this_state;
1907 #endif /* defined (TC_GENERIC_RELAX_TABLE) */
1909 /* Relax_align. Advance location counter to next address that has 'alignment'
1910 lowest order bits all 0s, return size of adjustment made. */
1911 static relax_addressT
1912 relax_align (register relax_addressT address, /* Address now. */
1913 register int alignment /* Alignment (binary). */)
1915 relax_addressT mask;
1916 relax_addressT new_address;
1918 mask = ~((~0) << alignment);
1919 new_address = (address + mask) & (~mask);
1920 #ifdef LINKER_RELAXING_SHRINKS_ONLY
1922 /* We must provide lots of padding, so the linker can discard it
1923 when needed. The linker will not add extra space, ever. */
1924 new_address += (1 << alignment);
1926 return (new_address - address);
1929 /* Now we have a segment, not a crowd of sub-segments, we can make
1934 After this, all frags in this segment have addresses that are correct
1935 within the segment. Since segments live in different file addresses,
1936 these frag addresses may not be the same as final object-file
1940 relax_segment (struct frag *segment_frag_root, segT segment, int pass)
1942 unsigned long frag_count;
1944 relax_addressT address;
1947 /* In case md_estimate_size_before_relax() wants to make fixSs. */
1948 subseg_change (segment, 0);
1950 /* For each frag in segment: count and store (a 1st guess of)
1953 for (frag_count = 0, fragP = segment_frag_root;
1955 fragP = fragP->fr_next, frag_count ++)
1957 fragP->relax_marker = 0;
1958 fragP->fr_address = address;
1959 address += fragP->fr_fix;
1961 switch (fragP->fr_type)
1964 address += fragP->fr_offset * fragP->fr_var;
1971 addressT offset = relax_align (address, (int) fragP->fr_offset);
1973 if (fragP->fr_subtype != 0 && offset > fragP->fr_subtype)
1976 if (offset % fragP->fr_var != 0)
1978 as_bad_where (fragP->fr_file, fragP->fr_line,
1979 _("alignment padding (%lu bytes) not a multiple of %ld"),
1980 (unsigned long) offset, (long) fragP->fr_var);
1981 offset -= (offset % fragP->fr_var);
1990 /* Assume .org is nugatory. It will grow with 1st relax. */
1993 case rs_machine_dependent:
1994 /* If fr_symbol is an expression, this call to
1995 resolve_symbol_value sets up the correct segment, which will
1996 likely be needed in md_estimate_size_before_relax. */
1997 if (fragP->fr_symbol)
1998 resolve_symbol_value (fragP->fr_symbol);
2000 address += md_estimate_size_before_relax (fragP, segment);
2003 #ifndef WORKING_DOT_WORD
2004 /* Broken words don't concern us yet. */
2005 case rs_broken_word:
2010 /* Initial guess is always 1; doing otherwise can result in
2011 stable solutions that are larger than the minimum. */
2012 address += fragP->fr_offset = 1;
2016 address += eh_frame_estimate_size_before_relax (fragP);
2020 address += dwarf2dbg_estimate_size_before_relax (fragP);
2024 BAD_CASE (fragP->fr_type);
2031 unsigned long max_iterations;
2032 offsetT stretch; /* May be any size, 0 or negative. */
2033 /* Cumulative number of addresses we have relaxed this pass.
2034 We may have relaxed more than one address. */
2035 int stretched; /* Have we stretched on this pass? */
2036 /* This is 'cuz stretch may be zero, when, in fact some piece of code
2037 grew, and another shrank. If a branch instruction doesn't fit anymore,
2038 we could be scrod. */
2040 /* We want to prevent going into an infinite loop where one frag grows
2041 depending upon the location of a symbol which is in turn moved by
2042 the growing frag. eg:
2048 So we dictate that this algorithm can be at most O2. */
2049 max_iterations = frag_count * frag_count;
2050 /* Check for overflow. */
2051 if (max_iterations < frag_count)
2052 max_iterations = frag_count;
2060 for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next)
2063 addressT was_address;
2067 fragP->relax_marker ^= 1;
2068 was_address = fragP->fr_address;
2069 address = fragP->fr_address += stretch;
2070 symbolP = fragP->fr_symbol;
2071 offset = fragP->fr_offset;
2073 switch (fragP->fr_type)
2075 case rs_fill: /* .fill never relaxes. */
2079 #ifndef WORKING_DOT_WORD
2080 /* JF: This is RMS's idea. I do *NOT* want to be blamed
2081 for it I do not want to write it. I do not want to have
2082 anything to do with it. This is not the proper way to
2083 implement this misfeature. */
2084 case rs_broken_word:
2086 struct broken_word *lie;
2087 struct broken_word *untruth;
2089 /* Yes this is ugly (storing the broken_word pointer
2090 in the symbol slot). Still, this whole chunk of
2091 code is ugly, and I don't feel like doing anything
2092 about it. Think of it as stubbornness in action. */
2094 for (lie = (struct broken_word *) (fragP->fr_symbol);
2095 lie && lie->dispfrag == fragP;
2096 lie = lie->next_broken_word)
2102 offset = (S_GET_VALUE (lie->add)
2104 - S_GET_VALUE (lie->sub));
2105 if (offset <= -32768 || offset >= 32767)
2107 if (flag_warn_displacement)
2110 sprint_value (buf, (addressT) lie->addnum);
2111 as_warn_where (fragP->fr_file, fragP->fr_line,
2112 _(".word %s-%s+%s didn't fit"),
2113 S_GET_NAME (lie->add),
2114 S_GET_NAME (lie->sub),
2118 if (fragP->fr_subtype == 0)
2120 fragP->fr_subtype++;
2121 growth += md_short_jump_size;
2123 for (untruth = lie->next_broken_word;
2124 untruth && untruth->dispfrag == lie->dispfrag;
2125 untruth = untruth->next_broken_word)
2126 if ((symbol_get_frag (untruth->add)
2127 == symbol_get_frag (lie->add))
2128 && (S_GET_VALUE (untruth->add)
2129 == S_GET_VALUE (lie->add)))
2132 untruth->use_jump = lie;
2134 growth += md_long_jump_size;
2139 } /* case rs_broken_word */
2145 addressT oldoff, newoff;
2147 oldoff = relax_align (was_address + fragP->fr_fix,
2149 newoff = relax_align (address + fragP->fr_fix,
2152 if (fragP->fr_subtype != 0)
2154 if (oldoff > fragP->fr_subtype)
2156 if (newoff > fragP->fr_subtype)
2160 growth = newoff - oldoff;
2166 addressT target = offset;
2171 /* Convert from an actual address to an octet offset
2172 into the section. Here it is assumed that the
2173 section's VMA is zero, and can omit subtracting it
2174 from the symbol's value to get the address offset. */
2175 know (S_GET_SEGMENT (symbolP)->vma == 0);
2176 target += S_GET_VALUE (symbolP) * OCTETS_PER_BYTE;
2179 know (fragP->fr_next);
2180 after = fragP->fr_next->fr_address;
2181 growth = target - after;
2186 /* Don't error on first few frag relax passes.
2187 The symbol might be an expression involving
2188 symbol values from other sections. If those
2189 sections have not yet been processed their
2190 frags will all have zero addresses, so we
2191 will calculate incorrect values for them. The
2192 number of passes we allow before giving an
2193 error is somewhat arbitrary. It should be at
2194 least one, with larger values requiring
2195 increasingly contrived dependencies between
2196 frags to trigger a false error. */
2199 /* Force another pass. */
2204 /* Growth may be negative, but variable part of frag
2205 cannot have fewer than 0 chars. That is, we can't
2207 as_bad_where (fragP->fr_file, fragP->fr_line,
2208 _("attempt to move .org backwards"));
2210 /* We've issued an error message. Change the
2211 frag to avoid cascading errors. */
2212 fragP->fr_type = rs_align;
2213 fragP->fr_subtype = 0;
2214 fragP->fr_offset = 0;
2215 fragP->fr_fix = after - was_address;
2219 /* This is an absolute growth factor */
2230 amount = S_GET_VALUE (symbolP);
2231 if (S_GET_SEGMENT (symbolP) != absolute_section
2232 || S_IS_COMMON (symbolP)
2233 || ! S_IS_DEFINED (symbolP))
2235 as_bad_where (fragP->fr_file, fragP->fr_line,
2236 _(".space specifies non-absolute value"));
2237 /* Prevent repeat of this error message. */
2238 fragP->fr_symbol = 0;
2240 else if (amount < 0)
2242 /* Don't error on first few frag relax passes.
2243 See rs_org comment for a longer explanation. */
2250 as_warn_where (fragP->fr_file, fragP->fr_line,
2251 _(".space or .fill with negative value, ignored"));
2252 fragP->fr_symbol = 0;
2255 growth = (was_address + fragP->fr_fix + amount
2256 - fragP->fr_next->fr_address);
2260 case rs_machine_dependent:
2261 #ifdef md_relax_frag
2262 growth = md_relax_frag (segment, fragP, stretch);
2264 #ifdef TC_GENERIC_RELAX_TABLE
2265 /* The default way to relax a frag is to look through
2266 TC_GENERIC_RELAX_TABLE. */
2267 growth = relax_frag (segment, fragP, stretch);
2268 #endif /* TC_GENERIC_RELAX_TABLE */
2277 value = resolve_symbol_value (fragP->fr_symbol);
2278 size = sizeof_leb128 (value, fragP->fr_subtype);
2279 growth = size - fragP->fr_offset;
2280 fragP->fr_offset = size;
2285 growth = eh_frame_relax_frag (fragP);
2289 growth = dwarf2dbg_relax_frag (fragP);
2293 BAD_CASE (fragP->fr_type);
2303 /* Until nothing further to relax. */
2304 while (stretched && -- max_iterations);
2307 as_fatal (_("Infinite loop encountered whilst attempting to compute the addresses of symbols in section %s"),
2308 segment_name (segment));
2311 for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next)
2312 if (fragP->last_fr_address != fragP->fr_address)
2314 fragP->last_fr_address = fragP->fr_address;
2321 number_to_chars_bigendian (char *buf, valueT val, int n)
2327 buf[n] = val & 0xff;
2333 number_to_chars_littleendian (char *buf, valueT val, int n)
2339 *buf++ = val & 0xff;
2345 write_print_statistics (FILE *file)
2347 fprintf (file, "fixups: %d\n", n_fixups);
2350 /* For debugging. */
2351 extern int indent_level;
2354 print_fixup (fixS *fixp)
2357 fprintf (stderr, "fix %lx %s:%d", (long) fixp, fixp->fx_file, fixp->fx_line);
2359 fprintf (stderr, " pcrel");
2360 if (fixp->fx_pcrel_adjust)
2361 fprintf (stderr, " pcrel_adjust=%d", fixp->fx_pcrel_adjust);
2362 if (fixp->fx_im_disp)
2365 fprintf (stderr, " im_disp=%d", fixp->fx_im_disp);
2367 fprintf (stderr, " im_disp");
2371 fprintf (stderr, " tcbit");
2373 fprintf (stderr, " done");
2374 fprintf (stderr, "\n size=%d frag=%lx where=%ld offset=%lx addnumber=%lx",
2375 fixp->fx_size, (long) fixp->fx_frag, (long) fixp->fx_where,
2376 (long) fixp->fx_offset, (long) fixp->fx_addnumber);
2377 fprintf (stderr, "\n %s (%d)", bfd_get_reloc_code_name (fixp->fx_r_type),
2381 fprintf (stderr, "\n +<");
2382 print_symbol_value_1 (stderr, fixp->fx_addsy);
2383 fprintf (stderr, ">");
2387 fprintf (stderr, "\n -<");
2388 print_symbol_value_1 (stderr, fixp->fx_subsy);
2389 fprintf (stderr, ">");
2391 fprintf (stderr, "\n");
2392 #ifdef TC_FIX_DATA_PRINT
2393 TC_FIX_DATA_PRINT (stderr, fixp);