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, 2008, 2009
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 3, 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 md_register_arithmetic
58 # define md_register_arithmetic 1
61 #ifndef TC_FORCE_RELOCATION_SUB_ABS
62 #define TC_FORCE_RELOCATION_SUB_ABS(FIX, SEG) \
63 (!md_register_arithmetic && (SEG) == reg_section)
66 #ifndef TC_FORCE_RELOCATION_SUB_LOCAL
68 #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG) \
69 (!md_register_arithmetic && (SEG) == reg_section)
71 #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG) 1
75 #ifndef TC_VALIDATE_FIX_SUB
76 #ifdef UNDEFINED_DIFFERENCE_OK
77 /* The PA needs this for PIC code generation. */
78 #define TC_VALIDATE_FIX_SUB(FIX, SEG) \
79 (md_register_arithmetic || (SEG) != reg_section)
81 #define TC_VALIDATE_FIX_SUB(FIX, SEG) \
82 ((md_register_arithmetic || (SEG) != reg_section) \
83 && ((FIX)->fx_r_type == BFD_RELOC_GPREL32 \
84 || (FIX)->fx_r_type == BFD_RELOC_GPREL16))
88 #ifndef TC_LINKRELAX_FIXUP
89 #define TC_LINKRELAX_FIXUP(SEG) 1
92 #ifndef MD_APPLY_SYM_VALUE
93 #define MD_APPLY_SYM_VALUE(FIX) 1
96 #ifndef TC_FINALIZE_SYMS_BEFORE_SIZE_SEG
97 #define TC_FINALIZE_SYMS_BEFORE_SIZE_SEG 1
100 #ifndef MD_PCREL_FROM_SECTION
101 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from (FIX)
104 #ifndef TC_FAKE_LABEL
105 #define TC_FAKE_LABEL(NAME) (strcmp ((NAME), FAKE_LABEL_NAME) == 0)
108 /* Positive values of TC_FX_SIZE_SLACK allow a target to define
109 fixups that far past the end of a frag. Having such fixups
110 is of course most most likely a bug in setting fx_size correctly.
111 A negative value disables the fixup check entirely, which is
112 appropriate for something like the Renesas / SuperH SH_COUNT
114 #ifndef TC_FX_SIZE_SLACK
115 #define TC_FX_SIZE_SLACK(FIX) 0
118 /* Used to control final evaluation of expressions. */
119 int finalize_syms = 0;
121 int symbol_table_frozen;
123 symbolS *abs_section_sym;
125 /* Remember the value of dot when parsing expressions. */
128 /* Relocs generated by ".reloc" pseudo. */
129 struct reloc_list* reloc_list;
131 void print_fixup (fixS *);
133 /* We generally attach relocs to frag chains. However, after we have
134 chained these all together into a segment, any relocs we add after
135 that must be attached to a segment. This will include relocs added
136 in md_estimate_size_for_relax, for example. */
137 static int frags_chained = 0;
141 #define RELOC_ENUM enum bfd_reloc_code_real
143 /* Create a fixS in obstack 'notes'. */
146 fix_new_internal (fragS *frag, /* Which frag? */
147 int where, /* Where in that frag? */
148 int size, /* 1, 2, or 4 usually. */
149 symbolS *add_symbol, /* X_add_symbol. */
150 symbolS *sub_symbol, /* X_op_symbol. */
151 offsetT offset, /* X_add_number. */
152 int pcrel, /* TRUE if PC-relative relocation. */
153 RELOC_ENUM r_type ATTRIBUTE_UNUSED /* Relocation type. */,
154 int at_beginning) /* Add to the start of the list? */
160 fixP = (fixS *) obstack_alloc (¬es, sizeof (fixS));
162 fixP->fx_frag = frag;
163 fixP->fx_where = where;
164 fixP->fx_size = size;
165 /* We've made fx_size a narrow field; check that it's wide enough. */
166 if (fixP->fx_size != size)
168 as_bad (_("field fx_size too small to hold %d"), size);
171 fixP->fx_addsy = add_symbol;
172 fixP->fx_subsy = sub_symbol;
173 fixP->fx_offset = offset;
174 fixP->fx_dot_value = dot_value;
175 fixP->fx_pcrel = pcrel;
176 fixP->fx_r_type = r_type;
177 fixP->fx_im_disp = 0;
178 fixP->fx_pcrel_adjust = 0;
179 fixP->fx_bit_fixP = 0;
180 fixP->fx_addnumber = 0;
184 fixP->fx_no_overflow = 0;
188 fixP->fx_cgen.insn = NULL;
189 fixP->fx_cgen.opinfo = 0;
193 TC_INIT_FIX_DATA (fixP);
196 as_where (&fixP->fx_file, &fixP->fx_line);
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);
209 fixP->fx_next = *seg_fix_rootP;
210 *seg_fix_rootP = fixP;
211 if (fixP->fx_next == NULL)
212 *seg_fix_tailP = fixP;
216 fixP->fx_next = NULL;
218 (*seg_fix_tailP)->fx_next = fixP;
220 *seg_fix_rootP = fixP;
221 *seg_fix_tailP = fixP;
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, FALSE);
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,
312 /* Create a fixup at the beginning of FRAG. The arguments are the same
313 as for fix_new, except that WHERE is implicitly 0. */
316 fix_at_start (fragS *frag, int size, symbolS *add_symbol,
317 offsetT offset, int pcrel, RELOC_ENUM r_type)
319 return fix_new_internal (frag, 0, size, add_symbol,
320 (symbolS *) NULL, offset, pcrel, r_type, TRUE);
323 /* Generic function to determine whether a fixup requires a relocation. */
325 generic_force_reloc (fixS *fix)
327 if (fix->fx_r_type == BFD_RELOC_VTABLE_INHERIT
328 || fix->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
331 if (fix->fx_addsy == NULL)
334 return S_FORCE_RELOC (fix->fx_addsy, fix->fx_subsy == NULL);
337 /* Append a string onto another string, bumping the pointer along. */
339 append (char **charPP, char *fromP, unsigned long length)
341 /* Don't trust memcpy() of 0 chars. */
345 memcpy (*charPP, fromP, length);
349 /* This routine records the largest alignment seen for each segment.
350 If the beginning of the segment is aligned on the worst-case
351 boundary, all of the other alignments within it will work. At
352 least one object format really uses this info. */
355 record_alignment (/* Segment to which alignment pertains. */
357 /* Alignment, as a power of 2 (e.g., 1 => 2-byte
358 boundary, 2 => 4-byte boundary, etc.) */
361 if (seg == absolute_section)
364 if ((unsigned int) align > bfd_get_section_alignment (stdoutput, seg))
365 bfd_set_section_alignment (stdoutput, seg, align);
369 get_recorded_alignment (segT seg)
371 if (seg == absolute_section)
374 return bfd_get_section_alignment (stdoutput, seg);
377 /* Reset the section indices after removing the gas created sections. */
380 renumber_sections (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *countparg)
382 int *countp = (int *) countparg;
384 sec->index = *countp;
389 chain_frchains_together_1 (segT section, struct frchain *frchp)
391 fragS dummy, *prev_frag = &dummy;
392 fixS fix_dummy, *prev_fix = &fix_dummy;
394 for (; frchp; frchp = frchp->frch_next)
396 prev_frag->fr_next = frchp->frch_root;
397 prev_frag = frchp->frch_last;
398 gas_assert (prev_frag->fr_type != 0);
399 if (frchp->fix_root != (fixS *) NULL)
401 if (seg_info (section)->fix_root == (fixS *) NULL)
402 seg_info (section)->fix_root = frchp->fix_root;
403 prev_fix->fx_next = frchp->fix_root;
404 seg_info (section)->fix_tail = frchp->fix_tail;
405 prev_fix = frchp->fix_tail;
408 gas_assert (prev_frag->fr_type != 0);
409 gas_assert (prev_frag != &dummy);
410 prev_frag->fr_next = 0;
415 chain_frchains_together (bfd *abfd ATTRIBUTE_UNUSED,
417 void *xxx ATTRIBUTE_UNUSED)
419 segment_info_type *info;
421 /* BFD may have introduced its own sections without using
422 subseg_new, so it is possible that seg_info is NULL. */
423 info = seg_info (section);
424 if (info != (segment_info_type *) NULL)
425 info->frchainP->frch_last
426 = chain_frchains_together_1 (section, info->frchainP);
428 /* Now that we've chained the frags together, we must add new fixups
429 to the segment, not to the frag chain. */
434 cvt_frag_to_fill (segT sec ATTRIBUTE_UNUSED, fragS *fragP)
436 switch (fragP->fr_type)
444 HANDLE_ALIGN (fragP);
446 know (fragP->fr_next != NULL);
447 fragP->fr_offset = (fragP->fr_next->fr_address
449 - fragP->fr_fix) / fragP->fr_var;
450 if (fragP->fr_offset < 0)
452 as_bad_where (fragP->fr_file, fragP->fr_line,
453 _("attempt to .org/.space backwards? (%ld)"),
454 (long) fragP->fr_offset);
455 fragP->fr_offset = 0;
457 fragP->fr_type = rs_fill;
465 valueT value = S_GET_VALUE (fragP->fr_symbol);
468 size = output_leb128 (fragP->fr_literal + fragP->fr_fix, value,
471 fragP->fr_fix += size;
472 fragP->fr_type = rs_fill;
474 fragP->fr_offset = 0;
475 fragP->fr_symbol = NULL;
480 eh_frame_convert_frag (fragP);
484 dwarf2dbg_convert_frag (fragP);
487 case rs_machine_dependent:
488 md_convert_frag (stdoutput, sec, fragP);
490 gas_assert (fragP->fr_next == NULL
491 || ((offsetT) (fragP->fr_next->fr_address - fragP->fr_address)
494 /* After md_convert_frag, we make the frag into a ".space 0".
495 md_convert_frag() should set up any fixSs and constants
500 #ifndef WORKING_DOT_WORD
503 struct broken_word *lie;
505 if (fragP->fr_subtype)
507 fragP->fr_fix += md_short_jump_size;
508 for (lie = (struct broken_word *) (fragP->fr_symbol);
509 lie && lie->dispfrag == fragP;
510 lie = lie->next_broken_word)
512 fragP->fr_fix += md_long_jump_size;
520 BAD_CASE (fragP->fr_type);
524 md_frag_check (fragP);
528 struct relax_seg_info
535 relax_seg (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *xxx)
537 segment_info_type *seginfo = seg_info (sec);
538 struct relax_seg_info *info = (struct relax_seg_info *) xxx;
540 if (seginfo && seginfo->frchainP
541 && relax_segment (seginfo->frchainP->frch_root, sec, info->pass))
546 size_seg (bfd *abfd, asection *sec, void *xxx ATTRIBUTE_UNUSED)
550 segment_info_type *seginfo;
552 valueT size, newsize;
554 subseg_change (sec, 0);
556 seginfo = seg_info (sec);
557 if (seginfo && seginfo->frchainP)
559 for (fragp = seginfo->frchainP->frch_root; fragp; fragp = fragp->fr_next)
560 cvt_frag_to_fill (sec, fragp);
561 for (fragp = seginfo->frchainP->frch_root;
563 fragp = fragp->fr_next)
564 /* Walk to last elt. */
566 size = fragp->fr_address + fragp->fr_fix;
571 flags = bfd_get_section_flags (abfd, sec);
572 if (size == 0 && bfd_get_section_size (sec) != 0 &&
573 (flags & SEC_HAS_CONTENTS) != 0)
576 if (size > 0 && ! seginfo->bss)
577 flags |= SEC_HAS_CONTENTS;
580 x = bfd_set_section_flags (abfd, sec, flags);
583 newsize = md_section_align (sec, size);
584 x = bfd_set_section_size (abfd, sec, newsize);
587 /* If the size had to be rounded up, add some padding in the last
589 gas_assert (newsize >= size);
592 fragS *last = seginfo->frchainP->frch_last;
593 fragp = seginfo->frchainP->frch_root;
594 while (fragp->fr_next != last)
595 fragp = fragp->fr_next;
596 last->fr_address = size;
597 if ((newsize - size) % fragp->fr_var == 0)
598 fragp->fr_offset += (newsize - size) / fragp->fr_var;
600 /* If we hit this abort, it's likely due to subsegs_finish not
601 providing sufficient alignment on the last frag, and the
602 machine dependent code using alignment frags with fr_var
607 #ifdef tc_frob_section
608 tc_frob_section (sec);
610 #ifdef obj_frob_section
611 obj_frob_section (sec);
617 dump_section_relocs (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, FILE *stream)
619 segment_info_type *seginfo = seg_info (sec);
620 fixS *fixp = seginfo->fix_root;
625 fprintf (stream, "sec %s relocs:\n", sec->name);
628 symbolS *s = fixp->fx_addsy;
630 fprintf (stream, " %08lx: type %d ", (unsigned long) fixp,
631 (int) fixp->fx_r_type);
633 fprintf (stream, "no sym\n");
636 print_symbol_value_1 (stream, s);
637 fprintf (stream, "\n");
639 fixp = fixp->fx_next;
643 #define dump_section_relocs(ABFD,SEC,STREAM) ((void) 0)
646 #ifndef EMIT_SECTION_SYMBOLS
647 #define EMIT_SECTION_SYMBOLS 1
650 /* Resolve U.A.OFFSET_SYM and U.A.SYM fields of RELOC_LIST entries,
651 and check for validity. Convert RELOC_LIST from using U.A fields
654 resolve_reloc_expr_symbols (void)
656 struct reloc_list *r;
658 for (r = reloc_list; r; r = r->next)
662 bfd_vma offset, addend;
664 reloc_howto_type *howto;
666 resolve_symbol_value (r->u.a.offset_sym);
667 symval = symbol_get_value_expression (r->u.a.offset_sym);
671 if (symval->X_op == O_constant)
672 sym = r->u.a.offset_sym;
673 else if (symval->X_op == O_symbol)
675 sym = symval->X_add_symbol;
676 offset = symval->X_add_number;
677 symval = symbol_get_value_expression (symval->X_add_symbol);
680 || symval->X_op != O_constant
681 || (sec = S_GET_SEGMENT (sym)) == NULL
682 || !SEG_NORMAL (sec))
684 as_bad_where (r->file, r->line, _("invalid offset expression"));
688 offset += S_GET_VALUE (sym);
691 addend = r->u.a.addend;
692 if (r->u.a.sym != NULL)
694 resolve_symbol_value (r->u.a.sym);
695 symval = symbol_get_value_expression (r->u.a.sym);
696 if (symval->X_op == O_constant)
698 else if (symval->X_op == O_symbol)
700 sym = symval->X_add_symbol;
701 addend += symval->X_add_number;
702 symval = symbol_get_value_expression (symval->X_add_symbol);
704 if (symval->X_op != O_constant)
706 as_bad_where (r->file, r->line, _("invalid reloc expression"));
709 else if (sym != NULL)
710 symbol_mark_used_in_reloc (sym);
714 if (abs_section_sym == NULL)
715 abs_section_sym = section_symbol (absolute_section);
716 sym = abs_section_sym;
719 howto = r->u.a.howto;
722 r->u.b.s = symbol_get_bfdsym (sym);
723 r->u.b.r.sym_ptr_ptr = &r->u.b.s;
724 r->u.b.r.address = offset;
725 r->u.b.r.addend = addend;
726 r->u.b.r.howto = howto;
730 /* This pass over fixups decides whether symbols can be replaced with
734 adjust_reloc_syms (bfd *abfd ATTRIBUTE_UNUSED,
736 void *xxx ATTRIBUTE_UNUSED)
738 segment_info_type *seginfo = seg_info (sec);
744 dump_section_relocs (abfd, sec, stderr);
746 for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next)
750 else if (fixp->fx_addsy)
756 fprintf (stderr, "\n\nadjusting fixup:\n");
760 sym = fixp->fx_addsy;
762 /* All symbols should have already been resolved at this
763 point. It is possible to see unresolved expression
764 symbols, though, since they are not in the regular symbol
766 resolve_symbol_value (sym);
768 if (fixp->fx_subsy != NULL)
769 resolve_symbol_value (fixp->fx_subsy);
771 /* If this symbol is equated to an undefined or common symbol,
772 convert the fixup to being against that symbol. */
773 while (symbol_equated_reloc_p (sym)
774 || S_IS_WEAKREFR (sym))
776 symbolS *newsym = symbol_get_value_expression (sym)->X_add_symbol;
779 fixp->fx_offset += symbol_get_value_expression (sym)->X_add_number;
780 fixp->fx_addsy = newsym;
784 if (symbol_mri_common_p (sym))
786 fixp->fx_offset += S_GET_VALUE (sym);
787 fixp->fx_addsy = symbol_get_value_expression (sym)->X_add_symbol;
791 /* If the symbol is undefined, common, weak, or global (ELF
792 shared libs), we can't replace it with the section symbol. */
793 if (S_FORCE_RELOC (fixp->fx_addsy, 1))
796 /* Is there some other (target cpu dependent) reason we can't adjust
797 this one? (E.g. relocations involving function addresses on
799 #ifdef tc_fix_adjustable
800 if (! tc_fix_adjustable (fixp))
804 /* Since we're reducing to section symbols, don't attempt to reduce
805 anything that's already using one. */
806 if (symbol_section_p (sym))
809 symsec = S_GET_SEGMENT (sym);
813 if (bfd_is_abs_section (symsec))
815 /* The fixup_segment routine normally will not use this
816 symbol in a relocation. */
820 /* Don't try to reduce relocs which refer to non-local symbols
821 in .linkonce sections. It can lead to confusion when a
822 debugging section refers to a .linkonce section. I hope
823 this will always be correct. */
824 if (symsec != sec && ! S_IS_LOCAL (sym))
826 if ((symsec->flags & SEC_LINK_ONCE) != 0
828 /* The GNU toolchain uses an extension for ELF: a
829 section beginning with the magic string
830 .gnu.linkonce is a linkonce section. */
831 && strncmp (segment_name (symsec), ".gnu.linkonce",
832 sizeof ".gnu.linkonce" - 1) == 0))
836 /* Never adjust a reloc against local symbol in a merge section
837 with non-zero addend. */
838 if ((symsec->flags & SEC_MERGE) != 0
839 && (fixp->fx_offset != 0 || fixp->fx_subsy != NULL))
842 /* Never adjust a reloc against TLS local symbol. */
843 if ((symsec->flags & SEC_THREAD_LOCAL) != 0)
846 /* We refetch the segment when calling section_symbol, rather
847 than using symsec, because S_GET_VALUE may wind up changing
848 the section when it calls resolve_symbol_value. */
849 fixp->fx_offset += S_GET_VALUE (sym);
850 fixp->fx_addsy = section_symbol (S_GET_SEGMENT (sym));
852 fprintf (stderr, "\nadjusted fixup:\n");
857 dump_section_relocs (abfd, sec, stderr);
862 Go through all the fixS's in a segment and see which ones can be
863 handled now. (These consist of fixS where we have since discovered
864 the value of a symbol, or the address of the frag involved.)
865 For each one, call md_apply_fix to put the fix into the frag data.
867 Result is a count of how many relocation structs will be needed to
868 handle the remaining fixS's that we couldn't completely handle here.
869 These will be output later by emit_relocations(). */
872 fixup_segment (fixS *fixP, segT this_segment)
874 long seg_reloc_count = 0;
877 segT add_symbol_segment = absolute_section;
879 if (fixP != NULL && abs_section_sym == NULL)
880 abs_section_sym = section_symbol (absolute_section);
882 /* If the linker is doing the relaxing, we must not do any fixups.
884 Well, strictly speaking that's not true -- we could do any that
885 are PC-relative and don't cross regions that could change size.
886 And for the i960 we might be able to turn callx/callj into bal
887 anyways in cases where we know the maximum displacement. */
888 if (linkrelax && TC_LINKRELAX_FIXUP (this_segment))
890 for (; fixP; fixP = fixP->fx_next)
893 if (fixP->fx_addsy == NULL)
895 /* There was no symbol required by this relocation.
896 However, BFD doesn't really handle relocations
897 without symbols well. So fake up a local symbol in
898 the absolute section. */
899 fixP->fx_addsy = abs_section_sym;
901 symbol_mark_used_in_reloc (fixP->fx_addsy);
902 if (fixP->fx_subsy != NULL)
903 symbol_mark_used_in_reloc (fixP->fx_subsy);
906 TC_ADJUST_RELOC_COUNT (fixP, seg_reloc_count);
907 return seg_reloc_count;
910 for (; fixP; fixP = fixP->fx_next)
913 fprintf (stderr, "\nprocessing fixup:\n");
917 fragP = fixP->fx_frag;
919 #ifdef TC_VALIDATE_FIX
920 TC_VALIDATE_FIX (fixP, this_segment, skip);
922 add_number = fixP->fx_offset;
924 if (fixP->fx_addsy != NULL)
925 add_symbol_segment = S_GET_SEGMENT (fixP->fx_addsy);
927 if (fixP->fx_subsy != NULL)
929 segT sub_symbol_segment;
930 resolve_symbol_value (fixP->fx_subsy);
931 sub_symbol_segment = S_GET_SEGMENT (fixP->fx_subsy);
932 if (fixP->fx_addsy != NULL
933 && sub_symbol_segment == add_symbol_segment
934 && !TC_FORCE_RELOCATION_SUB_SAME (fixP, add_symbol_segment))
936 add_number += S_GET_VALUE (fixP->fx_addsy);
937 add_number -= S_GET_VALUE (fixP->fx_subsy);
938 fixP->fx_offset = add_number;
939 fixP->fx_addsy = NULL;
940 fixP->fx_subsy = NULL;
942 /* See the comment below about 68k weirdness. */
946 else if (sub_symbol_segment == absolute_section
947 && !TC_FORCE_RELOCATION_SUB_ABS (fixP, add_symbol_segment))
949 add_number -= S_GET_VALUE (fixP->fx_subsy);
950 fixP->fx_offset = add_number;
951 fixP->fx_subsy = NULL;
953 else if (sub_symbol_segment == this_segment
954 && !TC_FORCE_RELOCATION_SUB_LOCAL (fixP, add_symbol_segment))
956 add_number -= S_GET_VALUE (fixP->fx_subsy);
957 fixP->fx_offset = (add_number + fixP->fx_dot_value
958 + fixP->fx_frag->fr_address);
960 /* Make it pc-relative. If the back-end code has not
961 selected a pc-relative reloc, cancel the adjustment
962 we do later on all pc-relative relocs. */
965 /* Do this for m68k even if it's already described
966 as pc-relative. On the m68k, an operand of
967 "pc@(foo-.-2)" should address "foo" in a
972 add_number += MD_PCREL_FROM_SECTION (fixP, this_segment);
973 fixP->fx_subsy = NULL;
976 else if (!TC_VALIDATE_FIX_SUB (fixP, add_symbol_segment))
978 if (!md_register_arithmetic
979 && (add_symbol_segment == reg_section
980 || sub_symbol_segment == reg_section))
981 as_bad_where (fixP->fx_file, fixP->fx_line,
982 _("register value used as expression"));
984 as_bad_where (fixP->fx_file, fixP->fx_line,
985 _("can't resolve `%s' {%s section} - `%s' {%s section}"),
986 fixP->fx_addsy ? S_GET_NAME (fixP->fx_addsy) : "0",
987 segment_name (add_symbol_segment),
988 S_GET_NAME (fixP->fx_subsy),
989 segment_name (sub_symbol_segment));
995 if (add_symbol_segment == this_segment
996 && !TC_FORCE_RELOCATION_LOCAL (fixP))
998 /* This fixup was made when the symbol's segment was
999 SEG_UNKNOWN, but it is now in the local segment.
1000 So we know how to do the address without relocation. */
1001 add_number += S_GET_VALUE (fixP->fx_addsy);
1002 fixP->fx_offset = add_number;
1004 add_number -= MD_PCREL_FROM_SECTION (fixP, this_segment);
1005 fixP->fx_addsy = NULL;
1008 else if (add_symbol_segment == absolute_section
1009 && !TC_FORCE_RELOCATION_ABS (fixP))
1011 add_number += S_GET_VALUE (fixP->fx_addsy);
1012 fixP->fx_offset = add_number;
1013 fixP->fx_addsy = NULL;
1015 else if (add_symbol_segment != undefined_section
1016 && ! bfd_is_com_section (add_symbol_segment)
1017 && MD_APPLY_SYM_VALUE (fixP))
1018 add_number += S_GET_VALUE (fixP->fx_addsy);
1023 add_number -= MD_PCREL_FROM_SECTION (fixP, this_segment);
1024 if (!fixP->fx_done && fixP->fx_addsy == NULL)
1026 /* There was no symbol required by this relocation.
1027 However, BFD doesn't really handle relocations
1028 without symbols well. So fake up a local symbol in
1029 the absolute section. */
1030 fixP->fx_addsy = abs_section_sym;
1035 md_apply_fix (fixP, &add_number, this_segment);
1040 if (fixP->fx_addsy == NULL)
1041 fixP->fx_addsy = abs_section_sym;
1042 symbol_mark_used_in_reloc (fixP->fx_addsy);
1043 if (fixP->fx_subsy != NULL)
1044 symbol_mark_used_in_reloc (fixP->fx_subsy);
1047 if (!fixP->fx_bit_fixP && !fixP->fx_no_overflow && fixP->fx_size != 0)
1049 if (fixP->fx_size < sizeof (valueT))
1054 mask--; /* Set all bits to one. */
1055 mask <<= fixP->fx_size * 8 - (fixP->fx_signed ? 1 : 0);
1056 if ((add_number & mask) != 0 && (add_number & mask) != mask)
1058 char buf[50], buf2[50];
1059 sprint_value (buf, fragP->fr_address + fixP->fx_where);
1060 if (add_number > 1000)
1061 sprint_value (buf2, add_number);
1063 sprintf (buf2, "%ld", (long) add_number);
1064 as_bad_where (fixP->fx_file, fixP->fx_line,
1065 _("value of %s too large for field of %d bytes at %s"),
1066 buf2, fixP->fx_size, buf);
1067 } /* Generic error checking. */
1069 #ifdef WARN_SIGNED_OVERFLOW_WORD
1070 /* Warn if a .word value is too large when treated as a signed
1071 number. We already know it is not too negative. This is to
1072 catch over-large switches generated by gcc on the 68k. */
1073 if (!flag_signed_overflow_ok
1074 && fixP->fx_size == 2
1075 && add_number > 0x7fff)
1076 as_bad_where (fixP->fx_file, fixP->fx_line,
1077 _("signed .word overflow; switch may be too large; %ld at 0x%lx"),
1079 (long) (fragP->fr_address + fixP->fx_where));
1081 } /* Not a bit fix. */
1083 #ifdef TC_VALIDATE_FIX
1084 skip: ATTRIBUTE_UNUSED_LABEL
1088 fprintf (stderr, "result:\n");
1091 } /* For each fixS in this segment. */
1093 TC_ADJUST_RELOC_COUNT (fixP, seg_reloc_count);
1094 return seg_reloc_count;
1098 fix_segment (bfd *abfd ATTRIBUTE_UNUSED,
1100 void *xxx ATTRIBUTE_UNUSED)
1102 segment_info_type *seginfo = seg_info (sec);
1104 fixup_segment (seginfo->fix_root, sec);
1108 install_reloc (asection *sec, arelent *reloc, fragS *fragp,
1109 char *file, unsigned int line)
1112 bfd_reloc_status_type s;
1115 if (reloc->sym_ptr_ptr != NULL
1116 && (sym = *reloc->sym_ptr_ptr) != NULL
1117 && (sym->flags & BSF_KEEP) == 0
1118 && ((sym->flags & BSF_SECTION_SYM) == 0
1119 || (EMIT_SECTION_SYMBOLS
1120 && !bfd_is_abs_section (sym->section))))
1121 as_bad_where (file, line, _("redefined symbol cannot be used on reloc"));
1123 s = bfd_install_relocation (stdoutput, reloc,
1124 fragp->fr_literal, fragp->fr_address,
1130 case bfd_reloc_overflow:
1131 as_bad_where (file, line, _("relocation overflow"));
1133 case bfd_reloc_outofrange:
1134 as_bad_where (file, line, _("relocation out of range"));
1137 as_fatal (_("%s:%u: bad return from bfd_install_relocation: %x"),
1143 write_relocs (bfd *abfd, asection *sec, void *xxx ATTRIBUTE_UNUSED)
1145 segment_info_type *seginfo = seg_info (sec);
1148 struct reloc_list *my_reloc_list, **rp, *r;
1152 /* If seginfo is NULL, we did not create this section; don't do
1153 anything with it. */
1154 if (seginfo == NULL)
1158 for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next)
1162 #ifdef RELOC_EXPANSION_POSSIBLE
1163 n *= MAX_RELOC_EXPANSION;
1166 /* Extract relocs for this section from reloc_list. */
1168 my_reloc_list = NULL;
1169 while ((r = *rp) != NULL)
1171 if (r->u.b.sec == sec)
1174 r->next = my_reloc_list;
1182 relocs = (arelent **) xcalloc (n, sizeof (arelent *));
1185 for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next)
1194 fx_size = fixp->fx_size;
1195 slack = TC_FX_SIZE_SLACK (fixp);
1197 fx_size = fx_size > slack ? fx_size - slack : 0;
1198 loc = fixp->fx_where + fx_size;
1199 if (slack >= 0 && loc > fixp->fx_frag->fr_fix)
1200 as_bad_where (fixp->fx_file, fixp->fx_line,
1201 _("internal error: fixup not contained within frag"));
1203 #ifndef RELOC_EXPANSION_POSSIBLE
1205 arelent *reloc = tc_gen_reloc (sec, fixp);
1209 relocs[i++] = reloc;
1214 arelent **reloc = tc_gen_reloc (sec, fixp);
1216 for (j = 0; reloc[j]; j++)
1217 relocs[i++] = reloc[j];
1221 for ( ; j != 0; --j)
1222 install_reloc (sec, relocs[i - j], fixp->fx_frag,
1223 fixp->fx_file, fixp->fx_line);
1229 unsigned int i, j, nsyms;
1231 sympp = bfd_get_outsymbols (stdoutput);
1232 nsyms = bfd_get_symcount (stdoutput);
1233 for (i = 0; i < n; i++)
1234 if (((*relocs[i]->sym_ptr_ptr)->flags & BSF_SECTION_SYM) == 0)
1236 for (j = 0; j < nsyms; j++)
1237 if (sympp[j] == *relocs[i]->sym_ptr_ptr)
1245 for (r = my_reloc_list; r != NULL; r = r->next)
1248 for (f = seginfo->frchainP->frch_root; f; f = f->fr_next)
1249 if (f->fr_address <= r->u.b.r.address
1250 && r->u.b.r.address < f->fr_address + f->fr_fix)
1253 as_bad_where (r->file, r->line,
1254 _("reloc not within (fixed part of) section"));
1257 relocs[n++] = &r->u.b.r;
1258 install_reloc (sec, &r->u.b.r, f, r->file, r->line);
1264 flagword flags = bfd_get_section_flags (abfd, sec);
1266 bfd_set_section_flags (abfd, sec, flags);
1267 bfd_set_reloc (stdoutput, sec, relocs, n);
1270 #ifdef SET_SECTION_RELOCS
1271 SET_SECTION_RELOCS (sec, relocs, n);
1279 fprintf (stderr, "relocs for sec %s\n", sec->name);
1280 for (i = 0; i < n; i++)
1283 s = *r->sym_ptr_ptr;
1284 fprintf (stderr, " reloc %2d @%p off %4lx : sym %-10s addend %lx\n",
1285 i, r, (unsigned long)r->address, s->name, (unsigned long)r->addend);
1292 write_contents (bfd *abfd ATTRIBUTE_UNUSED,
1294 void *xxx ATTRIBUTE_UNUSED)
1296 segment_info_type *seginfo = seg_info (sec);
1297 addressT offset = 0;
1300 /* Write out the frags. */
1302 || !(bfd_get_section_flags (abfd, sec) & SEC_HAS_CONTENTS))
1305 for (f = seginfo->frchainP->frch_root;
1314 gas_assert (f->fr_type == rs_fill);
1317 x = bfd_set_section_contents (stdoutput, sec,
1318 f->fr_literal, (file_ptr) offset,
1319 (bfd_size_type) f->fr_fix);
1321 as_fatal (_("can't write %s: %s"), stdoutput->filename,
1322 bfd_errmsg (bfd_get_error ()));
1323 offset += f->fr_fix;
1325 fill_literal = f->fr_literal + f->fr_fix;
1326 fill_size = f->fr_var;
1327 count = f->fr_offset;
1328 gas_assert (count >= 0);
1329 if (fill_size && count)
1332 if (fill_size > sizeof (buf))
1334 /* Do it the old way. Can this ever happen? */
1337 x = bfd_set_section_contents (stdoutput, sec,
1340 (bfd_size_type) fill_size);
1342 as_fatal (_("can't write %s: %s"), stdoutput->filename,
1343 bfd_errmsg (bfd_get_error ()));
1344 offset += fill_size;
1349 /* Build a buffer full of fill objects and output it as
1350 often as necessary. This saves on the overhead of
1351 potentially lots of bfd_set_section_contents calls. */
1355 n_per_buf = sizeof (buf);
1356 memset (buf, *fill_literal, n_per_buf);
1361 n_per_buf = sizeof (buf) / fill_size;
1362 for (i = n_per_buf, bufp = buf; i; i--, bufp += fill_size)
1363 memcpy (bufp, fill_literal, fill_size);
1365 for (; count > 0; count -= n_per_buf)
1367 n_per_buf = n_per_buf > count ? count : n_per_buf;
1368 x = bfd_set_section_contents
1369 (stdoutput, sec, buf, (file_ptr) offset,
1370 (bfd_size_type) n_per_buf * fill_size);
1372 as_fatal (_("cannot write to output file"));
1373 offset += n_per_buf * fill_size;
1381 merge_data_into_text (void)
1383 seg_info (text_section)->frchainP->frch_last->fr_next =
1384 seg_info (data_section)->frchainP->frch_root;
1385 seg_info (text_section)->frchainP->frch_last =
1386 seg_info (data_section)->frchainP->frch_last;
1387 seg_info (data_section)->frchainP = 0;
1398 /* Count symbols. We can't rely on a count made by the loop in
1399 write_object_file, because *_frob_file may add a new symbol or
1402 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
1408 bfd_size_type amt = (bfd_size_type) nsyms * sizeof (asymbol *);
1410 asympp = (asymbol **) bfd_alloc (stdoutput, amt);
1411 symp = symbol_rootP;
1412 for (i = 0; i < nsyms; i++, symp = symbol_next (symp))
1414 asympp[i] = symbol_get_bfdsym (symp);
1415 if (asympp[i]->flags != BSF_SECTION_SYM
1416 || !(bfd_is_const_section (asympp[i]->section)
1417 && asympp[i]->section->symbol == asympp[i]))
1418 asympp[i]->flags |= BSF_KEEP;
1419 symbol_mark_written (symp);
1424 result = bfd_set_symtab (stdoutput, asympp, nsyms);
1425 gas_assert (result);
1426 symbol_table_frozen = 1;
1429 /* Finish the subsegments. After every sub-segment, we fake an
1430 ".align ...". This conforms to BSD4.2 brane-damage. We then fake
1431 ".fill 0" because that is the kind of frag that requires least
1432 thought. ".align" frags like to have a following frag since that
1433 makes calculating their intended length trivial. */
1435 #ifndef SUB_SEGMENT_ALIGN
1437 /* The last subsegment gets an alignment corresponding to the alignment
1438 of the section. This allows proper nop-filling at the end of
1439 code-bearing sections. */
1440 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) \
1441 (!(FRCHAIN)->frch_next ? get_recorded_alignment (SEG) : 0)
1443 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) 0
1448 subsegs_finish (void)
1450 struct frchain *frchainP;
1453 for (s = stdoutput->sections; s; s = s->next)
1455 segment_info_type *seginfo = seg_info (s);
1459 for (frchainP = seginfo->frchainP;
1461 frchainP = frchainP->frch_next)
1465 subseg_set (s, frchainP->frch_subseg);
1467 /* This now gets called even if we had errors. In that case,
1468 any alignment is meaningless, and, moreover, will look weird
1469 if we are generating a listing. */
1472 alignment = SUB_SEGMENT_ALIGN (now_seg, frchainP);
1473 if ((bfd_get_section_flags (now_seg->owner, now_seg) & SEC_MERGE)
1474 && now_seg->entsize)
1476 unsigned int entsize = now_seg->entsize;
1479 while ((entsize & 1) == 0)
1484 if (entalign > alignment)
1485 alignment = entalign;
1489 if (subseg_text_p (now_seg))
1490 frag_align_code (alignment, 0);
1492 frag_align (alignment, 0, 0);
1494 /* frag_align will have left a new frag.
1495 Use this last frag for an empty ".fill".
1497 For this segment ...
1498 Create a last frag. Do not leave a "being filled in frag". */
1499 frag_wane (frag_now);
1500 frag_now->fr_fix = 0;
1501 know (frag_now->fr_next == NULL);
1506 /* Write the object file. */
1509 write_object_file (void)
1511 struct relax_seg_info rsi;
1512 #ifndef WORKING_DOT_WORD
1513 fragS *fragP; /* Track along all frags. */
1516 /* Do we really want to write it? */
1518 int n_warns, n_errs;
1519 n_warns = had_warnings ();
1520 n_errs = had_errors ();
1521 /* The -Z flag indicates that an object file should be generated,
1522 regardless of warnings and errors. */
1523 if (flag_always_generate_output)
1525 if (n_warns || n_errs)
1526 as_warn (_("%d error%s, %d warning%s, generating bad object file"),
1527 n_errs, n_errs == 1 ? "" : "s",
1528 n_warns, n_warns == 1 ? "" : "s");
1533 as_fatal (_("%d error%s, %d warning%s, no object file generated"),
1534 n_errs, n_errs == 1 ? "" : "s",
1535 n_warns, n_warns == 1 ? "" : "s");
1540 /* Under VMS we try to be compatible with VAX-11 "C". Thus, we call
1541 a routine to check for the definition of the procedure "_main",
1542 and if so -- fix it up so that it can be program entry point. */
1543 vms_check_for_main ();
1544 #endif /* OBJ_VMS */
1546 /* From now on, we don't care about sub-segments. Build one frag chain
1547 for each segment. Linked thru fr_next. */
1549 /* Remove the sections created by gas for its own purposes. */
1553 bfd_section_list_remove (stdoutput, reg_section);
1554 bfd_section_list_remove (stdoutput, expr_section);
1555 stdoutput->section_count -= 2;
1557 bfd_map_over_sections (stdoutput, renumber_sections, &i);
1560 bfd_map_over_sections (stdoutput, chain_frchains_together, (char *) 0);
1562 /* We have two segments. If user gave -R flag, then we must put the
1563 data frags into the text segment. Do this before relaxing so
1564 we know to take advantage of -R and make shorter addresses. */
1565 if (flag_readonly_data_in_text)
1567 merge_data_into_text ();
1573 #ifndef WORKING_DOT_WORD
1574 /* We need to reset the markers in the broken word list and
1575 associated frags between calls to relax_segment (via
1576 relax_seg). Since the broken word list is global, we do it
1577 once per round, rather than locally in relax_segment for each
1579 struct broken_word *brokp;
1581 for (brokp = broken_words;
1582 brokp != (struct broken_word *) NULL;
1583 brokp = brokp->next_broken_word)
1587 if (brokp->dispfrag != (fragS *) NULL
1588 && brokp->dispfrag->fr_type == rs_broken_word)
1589 brokp->dispfrag->fr_subtype = 0;
1594 bfd_map_over_sections (stdoutput, relax_seg, &rsi);
1600 /* Note - Most ports will use the default value of
1601 TC_FINALIZE_SYMS_BEFORE_SIZE_SEG, which 1. This will force
1602 local symbols to be resolved, removing their frag information.
1603 Some ports however, will not have finished relaxing all of
1604 their frags and will still need the local symbol frag
1605 information. These ports can set
1606 TC_FINALIZE_SYMS_BEFORE_SIZE_SEG to 0. */
1607 finalize_syms = TC_FINALIZE_SYMS_BEFORE_SIZE_SEG;
1609 bfd_map_over_sections (stdoutput, size_seg, (char *) 0);
1611 /* Relaxation has completed. Freeze all syms. */
1614 #ifdef md_post_relax_hook
1618 #ifndef WORKING_DOT_WORD
1620 struct broken_word *lie;
1621 struct broken_word **prevP;
1623 prevP = &broken_words;
1624 for (lie = broken_words; lie; lie = lie->next_broken_word)
1629 subseg_change (lie->seg, lie->subseg);
1630 exp.X_op = O_subtract;
1631 exp.X_add_symbol = lie->add;
1632 exp.X_op_symbol = lie->sub;
1633 exp.X_add_number = lie->addnum;
1634 #ifdef TC_CONS_FIX_NEW
1635 TC_CONS_FIX_NEW (lie->frag,
1636 lie->word_goes_here - lie->frag->fr_literal,
1639 fix_new_exp (lie->frag,
1640 lie->word_goes_here - lie->frag->fr_literal,
1641 2, &exp, 0, BFD_RELOC_16);
1643 *prevP = lie->next_broken_word;
1646 prevP = &(lie->next_broken_word);
1648 for (lie = broken_words; lie;)
1650 struct broken_word *untruth;
1652 addressT table_addr;
1653 addressT from_addr, to_addr;
1656 subseg_change (lie->seg, lie->subseg);
1657 fragP = lie->dispfrag;
1659 /* Find out how many broken_words go here. */
1662 untruth && untruth->dispfrag == fragP;
1663 untruth = untruth->next_broken_word)
1664 if (untruth->added == 1)
1667 table_ptr = lie->dispfrag->fr_opcode;
1668 table_addr = (lie->dispfrag->fr_address
1669 + (table_ptr - lie->dispfrag->fr_literal));
1670 /* Create the jump around the long jumps. This is a short
1671 jump from table_ptr+0 to table_ptr+n*long_jump_size. */
1672 from_addr = table_addr;
1673 to_addr = table_addr + md_short_jump_size + n * md_long_jump_size;
1674 md_create_short_jump (table_ptr, from_addr, to_addr, lie->dispfrag,
1676 table_ptr += md_short_jump_size;
1677 table_addr += md_short_jump_size;
1680 lie && lie->dispfrag == fragP;
1681 m++, lie = lie->next_broken_word)
1683 if (lie->added == 2)
1685 /* Patch the jump table. */
1686 for (untruth = (struct broken_word *) (fragP->fr_symbol);
1687 untruth && untruth->dispfrag == fragP;
1688 untruth = untruth->next_broken_word)
1690 if (untruth->use_jump == lie)
1692 /* This is the offset from ??? to table_ptr+0.
1693 The target is the same for all users of this
1694 md_long_jump, but the "sub" bases (and hence the
1695 offsets) may be different. */
1696 addressT to_word = table_addr - S_GET_VALUE (untruth->sub);
1697 #ifdef TC_CHECK_ADJUSTED_BROKEN_DOT_WORD
1698 TC_CHECK_ADJUSTED_BROKEN_DOT_WORD (to_word, untruth);
1700 md_number_to_chars (untruth->word_goes_here, to_word, 2);
1704 /* Install the long jump. */
1705 /* This is a long jump from table_ptr+0 to the final target. */
1706 from_addr = table_addr;
1707 to_addr = S_GET_VALUE (lie->add) + lie->addnum;
1708 md_create_long_jump (table_ptr, from_addr, to_addr, lie->dispfrag,
1710 table_ptr += md_long_jump_size;
1711 table_addr += md_long_jump_size;
1715 #endif /* not WORKING_DOT_WORD */
1717 /* Resolve symbol values. This needs to be done before processing
1723 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
1724 resolve_symbol_value (symp);
1726 resolve_local_symbol_values ();
1727 resolve_reloc_expr_symbols ();
1731 #ifdef tc_frob_file_before_adjust
1732 tc_frob_file_before_adjust ();
1734 #ifdef obj_frob_file_before_adjust
1735 obj_frob_file_before_adjust ();
1738 bfd_map_over_sections (stdoutput, adjust_reloc_syms, (char *) 0);
1740 #ifdef tc_frob_file_before_fix
1741 tc_frob_file_before_fix ();
1743 #ifdef obj_frob_file_before_fix
1744 obj_frob_file_before_fix ();
1747 bfd_map_over_sections (stdoutput, fix_segment, (char *) 0);
1749 /* Set up symbol table, and write it out. */
1753 bfd_boolean skip_next_symbol = FALSE;
1755 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
1760 if (skip_next_symbol)
1762 /* Don't do anything besides moving the value of the
1763 symbol from the GAS value-field to the BFD value-field. */
1764 symbol_get_bfdsym (symp)->value = S_GET_VALUE (symp);
1765 skip_next_symbol = FALSE;
1769 if (symbol_mri_common_p (symp))
1771 if (S_IS_EXTERNAL (symp))
1772 as_bad (_("%s: global symbols not supported in common sections"),
1774 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
1778 name = S_GET_NAME (symp);
1782 decode_local_label_name ((char *) S_GET_NAME (symp));
1783 /* They only differ if `name' is a fb or dollar local
1785 if (name2 != name && ! S_IS_DEFINED (symp))
1786 as_bad (_("local label `%s' is not defined"), name2);
1789 /* Do it again, because adjust_reloc_syms might introduce
1790 more symbols. They'll probably only be section symbols,
1791 but they'll still need to have the values computed. */
1792 resolve_symbol_value (symp);
1794 /* Skip symbols which were equated to undefined or common
1796 if (symbol_equated_reloc_p (symp)
1797 || S_IS_WEAKREFR (symp))
1799 const char *name = S_GET_NAME (symp);
1800 if (S_IS_COMMON (symp)
1801 && !TC_FAKE_LABEL (name)
1802 && !S_IS_WEAKREFR (symp)
1803 && (!S_IS_EXTERNAL (symp) || S_IS_LOCAL (symp)))
1805 expressionS *e = symbol_get_value_expression (symp);
1806 as_bad (_("Local symbol `%s' can't be equated to common symbol `%s'"),
1807 name, S_GET_NAME (e->X_add_symbol));
1809 if (S_GET_SEGMENT (symp) == reg_section)
1811 /* Report error only if we know the symbol name. */
1812 if (S_GET_NAME (symp) != reg_section->name)
1813 as_bad (_("can't make global register symbol `%s'"),
1816 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
1820 #ifdef obj_frob_symbol
1821 obj_frob_symbol (symp, punt);
1823 #ifdef tc_frob_symbol
1824 if (! punt || symbol_used_in_reloc_p (symp))
1825 tc_frob_symbol (symp, punt);
1828 /* If we don't want to keep this symbol, splice it out of
1829 the chain now. If EMIT_SECTION_SYMBOLS is 0, we never
1830 want section symbols. Otherwise, we skip local symbols
1831 and symbols that the frob_symbol macros told us to punt,
1832 but we keep such symbols if they are used in relocs. */
1833 if (symp == abs_section_sym
1834 || (! EMIT_SECTION_SYMBOLS
1835 && symbol_section_p (symp))
1836 /* Note that S_IS_EXTERNAL and S_IS_LOCAL are not always
1837 opposites. Sometimes the former checks flags and the
1838 latter examines the name... */
1839 || (!S_IS_EXTERNAL (symp)
1840 && (punt || S_IS_LOCAL (symp) ||
1841 (S_IS_WEAKREFD (symp) && ! symbol_used_p (symp)))
1842 && ! symbol_used_in_reloc_p (symp)))
1844 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
1846 /* After symbol_remove, symbol_next(symp) still returns
1847 the one that came after it in the chain. So we don't
1848 need to do any extra cleanup work here. */
1852 /* Make sure we really got a value for the symbol. */
1853 if (! symbol_resolved_p (symp))
1855 as_bad (_("can't resolve value for symbol `%s'"),
1857 symbol_mark_resolved (symp);
1860 /* Set the value into the BFD symbol. Up til now the value
1861 has only been kept in the gas symbolS struct. */
1862 symbol_get_bfdsym (symp)->value = S_GET_VALUE (symp);
1864 /* A warning construct is a warning symbol followed by the
1865 symbol warned about. Don't let anything object-format or
1866 target-specific muck with it; it's ready for output. */
1867 if (symbol_get_bfdsym (symp)->flags & BSF_WARNING)
1868 skip_next_symbol = TRUE;
1874 /* Now do any format-specific adjustments to the symbol table, such
1875 as adding file symbols. */
1876 #ifdef tc_adjust_symtab
1877 tc_adjust_symtab ();
1879 #ifdef obj_adjust_symtab
1880 obj_adjust_symtab ();
1883 /* Stop if there is an error. */
1887 /* Now that all the sizes are known, and contents correct, we can
1888 start writing to the file. */
1891 /* If *_frob_file changes the symbol value at this point, it is
1892 responsible for moving the changed value into symp->bsym->value
1893 as well. Hopefully all symbol value changing can be done in
1898 #ifdef obj_frob_file
1901 #ifdef obj_coff_generate_pdata
1902 obj_coff_generate_pdata ();
1904 bfd_map_over_sections (stdoutput, write_relocs, (char *) 0);
1906 #ifdef tc_frob_file_after_relocs
1907 tc_frob_file_after_relocs ();
1909 #ifdef obj_frob_file_after_relocs
1910 obj_frob_file_after_relocs ();
1913 bfd_map_over_sections (stdoutput, write_contents, (char *) 0);
1916 #ifdef TC_GENERIC_RELAX_TABLE
1917 /* Relax a fragment by scanning TC_GENERIC_RELAX_TABLE. */
1920 relax_frag (segT segment, fragS *fragP, long stretch)
1922 const relax_typeS *this_type;
1923 const relax_typeS *start_type;
1924 relax_substateT next_state;
1925 relax_substateT this_state;
1931 const relax_typeS *table;
1933 target = fragP->fr_offset;
1934 address = fragP->fr_address;
1935 table = TC_GENERIC_RELAX_TABLE;
1936 this_state = fragP->fr_subtype;
1937 start_type = this_type = table + this_state;
1938 symbolP = fragP->fr_symbol;
1944 sym_frag = symbol_get_frag (symbolP);
1946 #ifndef DIFF_EXPR_OK
1947 know (sym_frag != NULL);
1949 know (S_GET_SEGMENT (symbolP) != absolute_section
1950 || sym_frag == &zero_address_frag);
1951 target += S_GET_VALUE (symbolP);
1953 /* If frag has yet to be reached on this pass,
1954 assume it will move by STRETCH just as we did.
1955 If this is not so, it will be because some frag
1956 between grows, and that will force another pass. */
1959 && sym_frag->relax_marker != fragP->relax_marker
1960 && S_GET_SEGMENT (symbolP) == segment)
1966 aim = target - address - fragP->fr_fix;
1967 #ifdef TC_PCREL_ADJUST
1968 /* Currently only the ns32k family needs this. */
1969 aim += TC_PCREL_ADJUST (fragP);
1972 #ifdef md_prepare_relax_scan
1973 /* Formerly called M68K_AIM_KLUDGE. */
1974 md_prepare_relax_scan (fragP, address, aim, this_state, this_type);
1979 /* Look backwards. */
1980 for (next_state = this_type->rlx_more; next_state;)
1981 if (aim >= this_type->rlx_backward)
1985 /* Grow to next state. */
1986 this_state = next_state;
1987 this_type = table + this_state;
1988 next_state = this_type->rlx_more;
1993 /* Look forwards. */
1994 for (next_state = this_type->rlx_more; next_state;)
1995 if (aim <= this_type->rlx_forward)
1999 /* Grow to next state. */
2000 this_state = next_state;
2001 this_type = table + this_state;
2002 next_state = this_type->rlx_more;
2006 growth = this_type->rlx_length - start_type->rlx_length;
2008 fragP->fr_subtype = this_state;
2012 #endif /* defined (TC_GENERIC_RELAX_TABLE) */
2014 /* Relax_align. Advance location counter to next address that has 'alignment'
2015 lowest order bits all 0s, return size of adjustment made. */
2016 static relax_addressT
2017 relax_align (register relax_addressT address, /* Address now. */
2018 register int alignment /* Alignment (binary). */)
2020 relax_addressT mask;
2021 relax_addressT new_address;
2023 mask = ~((~0) << alignment);
2024 new_address = (address + mask) & (~mask);
2025 #ifdef LINKER_RELAXING_SHRINKS_ONLY
2027 /* We must provide lots of padding, so the linker can discard it
2028 when needed. The linker will not add extra space, ever. */
2029 new_address += (1 << alignment);
2031 return (new_address - address);
2034 /* Now we have a segment, not a crowd of sub-segments, we can make
2039 After this, all frags in this segment have addresses that are correct
2040 within the segment. Since segments live in different file addresses,
2041 these frag addresses may not be the same as final object-file
2045 relax_segment (struct frag *segment_frag_root, segT segment, int pass)
2047 unsigned long frag_count;
2049 relax_addressT address;
2052 /* In case md_estimate_size_before_relax() wants to make fixSs. */
2053 subseg_change (segment, 0);
2055 /* For each frag in segment: count and store (a 1st guess of)
2058 for (frag_count = 0, fragP = segment_frag_root;
2060 fragP = fragP->fr_next, frag_count ++)
2062 fragP->relax_marker = 0;
2063 fragP->fr_address = address;
2064 address += fragP->fr_fix;
2066 switch (fragP->fr_type)
2069 address += fragP->fr_offset * fragP->fr_var;
2076 addressT offset = relax_align (address, (int) fragP->fr_offset);
2078 if (fragP->fr_subtype != 0 && offset > fragP->fr_subtype)
2081 if (offset % fragP->fr_var != 0)
2083 as_bad_where (fragP->fr_file, fragP->fr_line,
2084 _("alignment padding (%lu bytes) not a multiple of %ld"),
2085 (unsigned long) offset, (long) fragP->fr_var);
2086 offset -= (offset % fragP->fr_var);
2095 /* Assume .org is nugatory. It will grow with 1st relax. */
2098 case rs_machine_dependent:
2099 /* If fr_symbol is an expression, this call to
2100 resolve_symbol_value sets up the correct segment, which will
2101 likely be needed in md_estimate_size_before_relax. */
2102 if (fragP->fr_symbol)
2103 resolve_symbol_value (fragP->fr_symbol);
2105 address += md_estimate_size_before_relax (fragP, segment);
2108 #ifndef WORKING_DOT_WORD
2109 /* Broken words don't concern us yet. */
2110 case rs_broken_word:
2115 /* Initial guess is always 1; doing otherwise can result in
2116 stable solutions that are larger than the minimum. */
2117 address += fragP->fr_offset = 1;
2121 address += eh_frame_estimate_size_before_relax (fragP);
2125 address += dwarf2dbg_estimate_size_before_relax (fragP);
2129 BAD_CASE (fragP->fr_type);
2136 unsigned long max_iterations;
2138 /* Cumulative address adjustment. */
2141 /* Have we made any adjustment this pass? We can't just test
2142 stretch because one piece of code may have grown and another
2146 /* Most horrible, but gcc may give us some exception data that
2147 is impossible to assemble, of the form
2151 .uleb128 end - start
2157 If the leb128 is two bytes in size, then end-start is 128*128,
2158 which requires a three byte leb128. If the leb128 is three
2159 bytes in size, then end-start is 128*128-1, which requires a
2160 two byte leb128. We work around this dilemma by inserting
2161 an extra 4 bytes of alignment just after the .align. This
2162 works because the data after the align is accessed relative to
2165 This counter is used in a tiny state machine to detect
2166 whether a leb128 followed by an align is impossible to
2168 int rs_leb128_fudge = 0;
2170 /* We want to prevent going into an infinite loop where one frag grows
2171 depending upon the location of a symbol which is in turn moved by
2172 the growing frag. eg:
2178 So we dictate that this algorithm can be at most O2. */
2179 max_iterations = frag_count * frag_count;
2180 /* Check for overflow. */
2181 if (max_iterations < frag_count)
2182 max_iterations = frag_count;
2190 for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next)
2193 addressT was_address;
2197 fragP->relax_marker ^= 1;
2198 was_address = fragP->fr_address;
2199 address = fragP->fr_address += stretch;
2200 symbolP = fragP->fr_symbol;
2201 offset = fragP->fr_offset;
2203 switch (fragP->fr_type)
2205 case rs_fill: /* .fill never relaxes. */
2209 #ifndef WORKING_DOT_WORD
2210 /* JF: This is RMS's idea. I do *NOT* want to be blamed
2211 for it I do not want to write it. I do not want to have
2212 anything to do with it. This is not the proper way to
2213 implement this misfeature. */
2214 case rs_broken_word:
2216 struct broken_word *lie;
2217 struct broken_word *untruth;
2219 /* Yes this is ugly (storing the broken_word pointer
2220 in the symbol slot). Still, this whole chunk of
2221 code is ugly, and I don't feel like doing anything
2222 about it. Think of it as stubbornness in action. */
2224 for (lie = (struct broken_word *) (fragP->fr_symbol);
2225 lie && lie->dispfrag == fragP;
2226 lie = lie->next_broken_word)
2232 offset = (S_GET_VALUE (lie->add)
2234 - S_GET_VALUE (lie->sub));
2235 if (offset <= -32768 || offset >= 32767)
2237 if (flag_warn_displacement)
2240 sprint_value (buf, (addressT) lie->addnum);
2241 as_warn_where (fragP->fr_file, fragP->fr_line,
2242 _(".word %s-%s+%s didn't fit"),
2243 S_GET_NAME (lie->add),
2244 S_GET_NAME (lie->sub),
2247 if (fragP->fr_subtype == 0)
2249 fragP->fr_subtype++;
2250 growth += md_short_jump_size;
2253 /* Redirect *all* words of this table with the same
2254 target, lest we have to handle the case where the
2255 same target but with a offset that fits on this
2256 round overflows at the next relaxation round. */
2257 for (untruth = (struct broken_word *) (fragP->fr_symbol);
2258 untruth && untruth->dispfrag == lie->dispfrag;
2259 untruth = untruth->next_broken_word)
2260 if ((symbol_get_frag (untruth->add)
2261 == symbol_get_frag (lie->add))
2262 && (S_GET_VALUE (untruth->add)
2263 == S_GET_VALUE (lie->add)))
2266 untruth->use_jump = lie;
2270 growth += md_long_jump_size;
2275 } /* case rs_broken_word */
2281 addressT oldoff, newoff;
2283 oldoff = relax_align (was_address + fragP->fr_fix,
2285 newoff = relax_align (address + fragP->fr_fix,
2288 if (fragP->fr_subtype != 0)
2290 if (oldoff > fragP->fr_subtype)
2292 if (newoff > fragP->fr_subtype)
2296 growth = newoff - oldoff;
2298 /* If this align happens to follow a leb128 and
2299 we have determined that the leb128 is bouncing
2300 in size, then break the cycle by inserting an
2303 && (rs_leb128_fudge & 16) != 0
2304 && (rs_leb128_fudge & 15) >= 2)
2306 segment_info_type *seginfo = seg_info (segment);
2307 struct obstack *ob = &seginfo->frchainP->frch_obstack;
2310 newf = frag_alloc (ob);
2311 obstack_blank_fast (ob, fragP->fr_var);
2312 obstack_finish (ob);
2313 memcpy (newf, fragP, SIZEOF_STRUCT_FRAG);
2314 memcpy (newf->fr_literal,
2315 fragP->fr_literal + fragP->fr_fix,
2317 newf->fr_type = rs_fill;
2319 newf->fr_offset = (((offsetT) 1 << fragP->fr_offset)
2321 if (newf->fr_offset * newf->fr_var
2322 != (offsetT) 1 << fragP->fr_offset)
2324 newf->fr_offset = (offsetT) 1 << fragP->fr_offset;
2327 /* Include growth of new frag, because rs_fill
2328 frags don't normally grow. */
2329 growth += newf->fr_offset * newf->fr_var;
2330 /* The new frag address is newoff. Adjust this
2331 for the amount we'll add when we process the
2333 newf->fr_address = newoff - stretch - growth;
2334 newf->relax_marker ^= 1;
2335 fragP->fr_next = newf;
2337 as_warn (_("padding added"));
2345 addressT target = offset;
2350 /* Convert from an actual address to an octet offset
2351 into the section. Here it is assumed that the
2352 section's VMA is zero, and can omit subtracting it
2353 from the symbol's value to get the address offset. */
2354 know (S_GET_SEGMENT (symbolP)->vma == 0);
2355 target += S_GET_VALUE (symbolP) * OCTETS_PER_BYTE;
2358 know (fragP->fr_next);
2359 after = fragP->fr_next->fr_address + stretch;
2360 growth = target - after;
2365 /* Don't error on first few frag relax passes.
2366 The symbol might be an expression involving
2367 symbol values from other sections. If those
2368 sections have not yet been processed their
2369 frags will all have zero addresses, so we
2370 will calculate incorrect values for them. The
2371 number of passes we allow before giving an
2372 error is somewhat arbitrary. It should be at
2373 least one, with larger values requiring
2374 increasingly contrived dependencies between
2375 frags to trigger a false error. */
2378 /* Force another pass. */
2383 /* Growth may be negative, but variable part of frag
2384 cannot have fewer than 0 chars. That is, we can't
2386 as_bad_where (fragP->fr_file, fragP->fr_line,
2387 _("attempt to move .org backwards"));
2389 /* We've issued an error message. Change the
2390 frag to avoid cascading errors. */
2391 fragP->fr_type = rs_align;
2392 fragP->fr_subtype = 0;
2393 fragP->fr_offset = 0;
2394 fragP->fr_fix = after - address;
2405 amount = S_GET_VALUE (symbolP);
2406 if (S_GET_SEGMENT (symbolP) != absolute_section
2407 || S_IS_COMMON (symbolP)
2408 || ! S_IS_DEFINED (symbolP))
2410 as_bad_where (fragP->fr_file, fragP->fr_line,
2411 _(".space specifies non-absolute value"));
2412 /* Prevent repeat of this error message. */
2413 fragP->fr_symbol = 0;
2415 else if (amount < 0)
2417 /* Don't error on first few frag relax passes.
2418 See rs_org comment for a longer explanation. */
2425 as_warn_where (fragP->fr_file, fragP->fr_line,
2426 _(".space or .fill with negative value, ignored"));
2427 fragP->fr_symbol = 0;
2430 growth = (was_address + fragP->fr_fix + amount
2431 - fragP->fr_next->fr_address);
2435 case rs_machine_dependent:
2436 #ifdef md_relax_frag
2437 growth = md_relax_frag (segment, fragP, stretch);
2439 #ifdef TC_GENERIC_RELAX_TABLE
2440 /* The default way to relax a frag is to look through
2441 TC_GENERIC_RELAX_TABLE. */
2442 growth = relax_frag (segment, fragP, stretch);
2443 #endif /* TC_GENERIC_RELAX_TABLE */
2452 value = resolve_symbol_value (fragP->fr_symbol);
2453 size = sizeof_leb128 (value, fragP->fr_subtype);
2454 growth = size - fragP->fr_offset;
2455 fragP->fr_offset = size;
2460 growth = eh_frame_relax_frag (fragP);
2464 growth = dwarf2dbg_relax_frag (fragP);
2468 BAD_CASE (fragP->fr_type);
2475 if (fragP->fr_type == rs_leb128)
2476 rs_leb128_fudge += 16;
2477 else if (fragP->fr_type == rs_align
2478 && (rs_leb128_fudge & 16) != 0
2480 rs_leb128_fudge += 16;
2482 rs_leb128_fudge = 0;
2487 && (rs_leb128_fudge & 16) == 0
2488 && (rs_leb128_fudge & -16) != 0)
2489 rs_leb128_fudge += 1;
2491 rs_leb128_fudge = 0;
2493 /* Until nothing further to relax. */
2494 while (stretched && -- max_iterations);
2497 as_fatal (_("Infinite loop encountered whilst attempting to compute the addresses of symbols in section %s"),
2498 segment_name (segment));
2501 for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next)
2502 if (fragP->last_fr_address != fragP->fr_address)
2504 fragP->last_fr_address = fragP->fr_address;
2511 number_to_chars_bigendian (char *buf, valueT val, int n)
2517 buf[n] = val & 0xff;
2523 number_to_chars_littleendian (char *buf, valueT val, int n)
2529 *buf++ = val & 0xff;
2535 write_print_statistics (FILE *file)
2537 fprintf (file, "fixups: %d\n", n_fixups);
2540 /* For debugging. */
2541 extern int indent_level;
2544 print_fixup (fixS *fixp)
2547 fprintf (stderr, "fix ");
2548 fprintf_vma (stderr, (bfd_vma)((bfd_hostptr_t) fixp));
2549 fprintf (stderr, " %s:%d",fixp->fx_file, fixp->fx_line);
2551 fprintf (stderr, " pcrel");
2552 if (fixp->fx_pcrel_adjust)
2553 fprintf (stderr, " pcrel_adjust=%d", fixp->fx_pcrel_adjust);
2554 if (fixp->fx_im_disp)
2557 fprintf (stderr, " im_disp=%d", fixp->fx_im_disp);
2559 fprintf (stderr, " im_disp");
2563 fprintf (stderr, " tcbit");
2565 fprintf (stderr, " done");
2566 fprintf (stderr, "\n size=%d frag=", fixp->fx_size);
2567 fprintf_vma (stderr, (bfd_vma) ((bfd_hostptr_t) fixp->fx_frag));
2568 fprintf (stderr, " where=%ld offset=%lx addnumber=%lx",
2569 (long) fixp->fx_where,
2570 (unsigned long) fixp->fx_offset,
2571 (unsigned long) fixp->fx_addnumber);
2572 fprintf (stderr, "\n %s (%d)", bfd_get_reloc_code_name (fixp->fx_r_type),
2576 fprintf (stderr, "\n +<");
2577 print_symbol_value_1 (stderr, fixp->fx_addsy);
2578 fprintf (stderr, ">");
2582 fprintf (stderr, "\n -<");
2583 print_symbol_value_1 (stderr, fixp->fx_subsy);
2584 fprintf (stderr, ">");
2586 fprintf (stderr, "\n");
2587 #ifdef TC_FIX_DATA_PRINT
2588 TC_FIX_DATA_PRINT (stderr, fixp);