1 /* write.c - emit .o file
2 Copyright (C) 1986-2019 Free Software Foundation, Inc.
4 This file is part of GAS, the GNU Assembler.
6 GAS is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3, or (at your option)
11 GAS is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GAS; see the file COPYING. If not, write to the Free
18 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
21 /* This thing should be set up to do byte ordering correctly. But... */
26 #include "output-file.h"
27 #include "dwarf2dbg.h"
28 #include "compress-debug.h"
30 #ifndef TC_FORCE_RELOCATION
31 #define TC_FORCE_RELOCATION(FIX) \
32 (generic_force_reloc (FIX))
35 #ifndef TC_FORCE_RELOCATION_ABS
36 #define TC_FORCE_RELOCATION_ABS(FIX) \
37 (TC_FORCE_RELOCATION (FIX))
40 #define GENERIC_FORCE_RELOCATION_LOCAL(FIX) \
42 || TC_FORCE_RELOCATION (FIX))
43 #ifndef TC_FORCE_RELOCATION_LOCAL
44 #define TC_FORCE_RELOCATION_LOCAL GENERIC_FORCE_RELOCATION_LOCAL
47 #define GENERIC_FORCE_RELOCATION_SUB_SAME(FIX, SEG) \
49 #ifndef TC_FORCE_RELOCATION_SUB_SAME
50 #define TC_FORCE_RELOCATION_SUB_SAME GENERIC_FORCE_RELOCATION_SUB_SAME
53 #ifndef md_register_arithmetic
54 # define md_register_arithmetic 1
57 #ifndef TC_FORCE_RELOCATION_SUB_ABS
58 #define TC_FORCE_RELOCATION_SUB_ABS(FIX, SEG) \
59 (!md_register_arithmetic && (SEG) == reg_section)
62 #ifndef TC_FORCE_RELOCATION_SUB_LOCAL
64 #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG) \
65 (!md_register_arithmetic && (SEG) == reg_section)
67 #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG) 1
71 #ifndef TC_VALIDATE_FIX_SUB
72 #ifdef UNDEFINED_DIFFERENCE_OK
73 /* The PA needs this for PIC code generation. */
74 #define TC_VALIDATE_FIX_SUB(FIX, SEG) \
75 (md_register_arithmetic || (SEG) != reg_section)
77 #define TC_VALIDATE_FIX_SUB(FIX, SEG) \
78 ((md_register_arithmetic || (SEG) != reg_section) \
79 && ((FIX)->fx_r_type == BFD_RELOC_GPREL32 \
80 || (FIX)->fx_r_type == BFD_RELOC_GPREL16))
84 #ifndef TC_LINKRELAX_FIXUP
85 #define TC_LINKRELAX_FIXUP(SEG) 1
88 #ifndef MD_APPLY_SYM_VALUE
89 #define MD_APPLY_SYM_VALUE(FIX) 1
92 #ifndef TC_FINALIZE_SYMS_BEFORE_SIZE_SEG
93 #define TC_FINALIZE_SYMS_BEFORE_SIZE_SEG 1
96 #ifndef MD_PCREL_FROM_SECTION
97 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from (FIX)
100 #ifndef TC_FAKE_LABEL
101 #define TC_FAKE_LABEL(NAME) (strcmp ((NAME), FAKE_LABEL_NAME) == 0)
104 /* Positive values of TC_FX_SIZE_SLACK allow a target to define
105 fixups that far past the end of a frag. Having such fixups
106 is of course most most likely a bug in setting fx_size correctly.
107 A negative value disables the fixup check entirely, which is
108 appropriate for something like the Renesas / SuperH SH_COUNT
110 #ifndef TC_FX_SIZE_SLACK
111 #define TC_FX_SIZE_SLACK(FIX) 0
114 /* Used to control final evaluation of expressions. */
115 int finalize_syms
= 0;
117 int symbol_table_frozen
;
119 symbolS
*abs_section_sym
;
121 /* Remember the value of dot when parsing expressions. */
124 /* The frag that dot_value is based from. */
127 /* Relocs generated by ".reloc" pseudo. */
128 struct reloc_list
* reloc_list
;
130 void print_fixup (fixS
*);
132 /* We generally attach relocs to frag chains. However, after we have
133 chained these all together into a segment, any relocs we add after
134 that must be attached to a segment. This will include relocs added
135 in md_estimate_size_for_relax, for example. */
136 static int frags_chained
= 0;
140 #define RELOC_ENUM enum bfd_reloc_code_real
142 /* Create a fixS in obstack 'notes'. */
145 fix_new_internal (fragS
*frag
, /* Which frag? */
146 unsigned long where
, /* Where in that frag? */
147 unsigned long size
, /* 1, 2, or 4 usually. */
148 symbolS
*add_symbol
, /* X_add_symbol. */
149 symbolS
*sub_symbol
, /* X_op_symbol. */
150 offsetT offset
, /* X_add_number. */
151 int pcrel
, /* TRUE if PC-relative relocation. */
152 RELOC_ENUM r_type
/* Relocation type. */,
153 int at_beginning
) /* Add to the start of the list? */
159 fixP
= (fixS
*) obstack_alloc (¬es
, sizeof (fixS
));
161 fixP
->fx_frag
= frag
;
162 fixP
->fx_where
= where
;
163 fixP
->fx_size
= size
;
164 /* We've made fx_size a narrow field; check that it's wide enough. */
165 if (fixP
->fx_size
!= size
)
167 as_bad (_("field fx_size too small to hold %lu"), size
);
170 fixP
->fx_addsy
= add_symbol
;
171 fixP
->fx_subsy
= sub_symbol
;
172 fixP
->fx_offset
= offset
;
173 fixP
->fx_dot_value
= dot_value
;
174 fixP
->fx_dot_frag
= dot_frag
;
175 fixP
->fx_pcrel
= pcrel
;
176 fixP
->fx_r_type
= r_type
;
177 fixP
->fx_pcrel_adjust
= 0;
178 fixP
->fx_addnumber
= 0;
182 fixP
->fx_no_overflow
= 0;
186 fixP
->fx_cgen
.insn
= NULL
;
187 fixP
->fx_cgen
.opinfo
= 0;
191 TC_INIT_FIX_DATA (fixP
);
194 fixP
->fx_file
= as_where (&fixP
->fx_line
);
198 fixS
**seg_fix_rootP
= (frags_chained
199 ? &seg_info (now_seg
)->fix_root
200 : &frchain_now
->fix_root
);
201 fixS
**seg_fix_tailP
= (frags_chained
202 ? &seg_info (now_seg
)->fix_tail
203 : &frchain_now
->fix_tail
);
207 fixP
->fx_next
= *seg_fix_rootP
;
208 *seg_fix_rootP
= fixP
;
209 if (fixP
->fx_next
== NULL
)
210 *seg_fix_tailP
= fixP
;
214 fixP
->fx_next
= NULL
;
216 (*seg_fix_tailP
)->fx_next
= fixP
;
218 *seg_fix_rootP
= fixP
;
219 *seg_fix_tailP
= fixP
;
226 /* Create a fixup relative to a symbol (plus a constant). */
229 fix_new (fragS
*frag
, /* Which frag? */
230 unsigned long where
, /* Where in that frag? */
231 unsigned long size
, /* 1, 2, or 4 usually. */
232 symbolS
*add_symbol
, /* X_add_symbol. */
233 offsetT offset
, /* X_add_number. */
234 int pcrel
, /* TRUE if PC-relative relocation. */
235 RELOC_ENUM r_type
/* Relocation type. */)
237 return fix_new_internal (frag
, where
, size
, add_symbol
,
238 (symbolS
*) NULL
, offset
, pcrel
, r_type
, FALSE
);
241 /* Create a fixup for an expression. Currently we only support fixups
242 for difference expressions. That is itself more than most object
243 file formats support anyhow. */
246 fix_new_exp (fragS
*frag
, /* Which frag? */
247 unsigned long where
, /* Where in that frag? */
248 unsigned long size
, /* 1, 2, or 4 usually. */
249 expressionS
*exp
, /* Expression. */
250 int pcrel
, /* TRUE if PC-relative relocation. */
251 RELOC_ENUM r_type
/* Relocation type. */)
263 as_bad (_("register value used as expression"));
267 /* This comes up when _GLOBAL_OFFSET_TABLE_+(.-L0) is read, if
268 the difference expression cannot immediately be reduced. */
270 symbolS
*stmp
= make_expr_symbol (exp
);
272 exp
->X_op
= O_symbol
;
273 exp
->X_op_symbol
= 0;
274 exp
->X_add_symbol
= stmp
;
275 exp
->X_add_number
= 0;
277 return fix_new_exp (frag
, where
, size
, exp
, pcrel
, r_type
);
281 add
= exp
->X_add_symbol
;
282 off
= exp
->X_add_number
;
283 r_type
= BFD_RELOC_RVA
;
287 sub
= exp
->X_add_symbol
;
288 off
= exp
->X_add_number
;
292 sub
= exp
->X_op_symbol
;
295 add
= exp
->X_add_symbol
;
298 off
= exp
->X_add_number
;
302 add
= make_expr_symbol (exp
);
306 return fix_new_internal (frag
, where
, size
, add
, sub
, off
, pcrel
,
310 /* Create a fixup at the beginning of FRAG. The arguments are the same
311 as for fix_new, except that WHERE is implicitly 0. */
314 fix_at_start (fragS
*frag
, unsigned long size
, symbolS
*add_symbol
,
315 offsetT offset
, int pcrel
, RELOC_ENUM r_type
)
317 return fix_new_internal (frag
, 0, size
, add_symbol
,
318 (symbolS
*) NULL
, offset
, pcrel
, r_type
, TRUE
);
321 /* Generic function to determine whether a fixup requires a relocation. */
323 generic_force_reloc (fixS
*fix
)
325 if (fix
->fx_r_type
== BFD_RELOC_VTABLE_INHERIT
326 || fix
->fx_r_type
== BFD_RELOC_VTABLE_ENTRY
)
329 if (fix
->fx_addsy
== NULL
)
332 return S_FORCE_RELOC (fix
->fx_addsy
, fix
->fx_subsy
== NULL
);
335 /* Append a string onto another string, bumping the pointer along. */
337 append (char **charPP
, char *fromP
, unsigned long length
)
339 /* Don't trust memcpy() of 0 chars. */
343 memcpy (*charPP
, fromP
, length
);
347 /* This routine records the largest alignment seen for each segment.
348 If the beginning of the segment is aligned on the worst-case
349 boundary, all of the other alignments within it will work. At
350 least one object format really uses this info. */
353 record_alignment (/* Segment to which alignment pertains. */
355 /* Alignment, as a power of 2 (e.g., 1 => 2-byte
356 boundary, 2 => 4-byte boundary, etc.) */
359 if (seg
== absolute_section
)
362 if (align
> bfd_section_alignment (seg
))
363 bfd_set_section_alignment (seg
, align
);
367 get_recorded_alignment (segT seg
)
369 if (seg
== absolute_section
)
372 return bfd_section_alignment (seg
);
375 /* Reset the section indices after removing the gas created sections. */
378 renumber_sections (bfd
*abfd ATTRIBUTE_UNUSED
, asection
*sec
, void *countparg
)
380 int *countp
= (int *) countparg
;
382 sec
->index
= *countp
;
387 chain_frchains_together_1 (segT section
, struct frchain
*frchp
)
389 fragS dummy
, *prev_frag
= &dummy
;
390 fixS fix_dummy
, *prev_fix
= &fix_dummy
;
392 for (; frchp
; frchp
= frchp
->frch_next
)
394 prev_frag
->fr_next
= frchp
->frch_root
;
395 prev_frag
= frchp
->frch_last
;
396 gas_assert (prev_frag
->fr_type
!= 0);
397 if (frchp
->fix_root
!= (fixS
*) NULL
)
399 if (seg_info (section
)->fix_root
== (fixS
*) NULL
)
400 seg_info (section
)->fix_root
= frchp
->fix_root
;
401 prev_fix
->fx_next
= frchp
->fix_root
;
402 seg_info (section
)->fix_tail
= frchp
->fix_tail
;
403 prev_fix
= frchp
->fix_tail
;
406 gas_assert (prev_frag
!= &dummy
407 && prev_frag
->fr_type
!= 0);
408 prev_frag
->fr_next
= 0;
413 chain_frchains_together (bfd
*abfd ATTRIBUTE_UNUSED
,
415 void *xxx ATTRIBUTE_UNUSED
)
417 segment_info_type
*info
;
419 /* BFD may have introduced its own sections without using
420 subseg_new, so it is possible that seg_info is NULL. */
421 info
= seg_info (section
);
422 if (info
!= (segment_info_type
*) NULL
)
423 info
->frchainP
->frch_last
424 = chain_frchains_together_1 (section
, info
->frchainP
);
426 /* Now that we've chained the frags together, we must add new fixups
427 to the segment, not to the frag chain. */
432 cvt_frag_to_fill (segT sec ATTRIBUTE_UNUSED
, fragS
*fragP
)
434 switch (fragP
->fr_type
)
444 HANDLE_ALIGN (fragP
);
447 know (fragP
->fr_next
!= NULL
);
448 fragP
->fr_offset
= (fragP
->fr_next
->fr_address
450 - fragP
->fr_fix
) / fragP
->fr_var
;
451 if (fragP
->fr_offset
< 0)
453 as_bad_where (fragP
->fr_file
, fragP
->fr_line
,
454 _("attempt to .org/.space/.nops backwards? (%ld)"),
455 (long) fragP
->fr_offset
);
456 fragP
->fr_offset
= 0;
458 if (fragP
->fr_type
== rs_space_nop
)
459 fragP
->fr_type
= rs_fill_nop
;
461 fragP
->fr_type
= rs_fill
;
470 valueT value
= S_GET_VALUE (fragP
->fr_symbol
);
473 if (!S_IS_DEFINED (fragP
->fr_symbol
))
475 as_bad_where (fragP
->fr_file
, fragP
->fr_line
,
476 _("leb128 operand is an undefined symbol: %s"),
477 S_GET_NAME (fragP
->fr_symbol
));
480 size
= output_leb128 (fragP
->fr_literal
+ fragP
->fr_fix
, value
,
483 fragP
->fr_fix
+= size
;
484 fragP
->fr_type
= rs_fill
;
486 fragP
->fr_offset
= 0;
487 fragP
->fr_symbol
= NULL
;
492 eh_frame_convert_frag (fragP
);
496 dwarf2dbg_convert_frag (fragP
);
499 case rs_machine_dependent
:
500 md_convert_frag (stdoutput
, sec
, fragP
);
502 gas_assert (fragP
->fr_next
== NULL
503 || (fragP
->fr_next
->fr_address
- fragP
->fr_address
506 /* After md_convert_frag, we make the frag into a ".space 0".
507 md_convert_frag() should set up any fixSs and constants
512 #ifndef WORKING_DOT_WORD
515 struct broken_word
*lie
;
517 if (fragP
->fr_subtype
)
519 fragP
->fr_fix
+= md_short_jump_size
;
520 for (lie
= (struct broken_word
*) (fragP
->fr_symbol
);
521 lie
&& lie
->dispfrag
== fragP
;
522 lie
= lie
->next_broken_word
)
524 fragP
->fr_fix
+= md_long_jump_size
;
532 BAD_CASE (fragP
->fr_type
);
536 md_frag_check (fragP
);
540 struct relax_seg_info
547 relax_seg (bfd
*abfd ATTRIBUTE_UNUSED
, asection
*sec
, void *xxx
)
549 segment_info_type
*seginfo
= seg_info (sec
);
550 struct relax_seg_info
*info
= (struct relax_seg_info
*) xxx
;
552 if (seginfo
&& seginfo
->frchainP
553 && relax_segment (seginfo
->frchainP
->frch_root
, sec
, info
->pass
))
558 size_seg (bfd
*abfd ATTRIBUTE_UNUSED
, asection
*sec
, void *xxx ATTRIBUTE_UNUSED
)
562 segment_info_type
*seginfo
;
564 valueT size
, newsize
;
566 subseg_change (sec
, 0);
568 seginfo
= seg_info (sec
);
569 if (seginfo
&& seginfo
->frchainP
)
571 for (fragp
= seginfo
->frchainP
->frch_root
; fragp
; fragp
= fragp
->fr_next
)
572 cvt_frag_to_fill (sec
, fragp
);
573 for (fragp
= seginfo
->frchainP
->frch_root
;
575 fragp
= fragp
->fr_next
)
576 /* Walk to last elt. */
578 size
= fragp
->fr_address
+ fragp
->fr_fix
;
583 flags
= bfd_section_flags (sec
);
584 if (size
== 0 && bfd_section_size (sec
) != 0 &&
585 (flags
& SEC_HAS_CONTENTS
) != 0)
588 if (size
> 0 && ! seginfo
->bss
)
589 flags
|= SEC_HAS_CONTENTS
;
592 x
= bfd_set_section_flags (sec
, flags
);
595 /* If permitted, allow the backend to pad out the section
596 to some alignment boundary. */
597 if (do_not_pad_sections_to_alignment
)
600 newsize
= md_section_align (sec
, size
);
601 x
= bfd_set_section_size (sec
, newsize
);
604 /* If the size had to be rounded up, add some padding in the last
606 gas_assert (newsize
>= size
);
609 fragS
*last
= seginfo
->frchainP
->frch_last
;
610 fragp
= seginfo
->frchainP
->frch_root
;
611 while (fragp
->fr_next
!= last
)
612 fragp
= fragp
->fr_next
;
613 last
->fr_address
= size
;
614 if ((newsize
- size
) % fragp
->fr_var
== 0)
615 fragp
->fr_offset
+= (newsize
- size
) / fragp
->fr_var
;
617 /* If we hit this abort, it's likely due to subsegs_finish not
618 providing sufficient alignment on the last frag, and the
619 machine dependent code using alignment frags with fr_var
624 #ifdef tc_frob_section
625 tc_frob_section (sec
);
627 #ifdef obj_frob_section
628 obj_frob_section (sec
);
634 dump_section_relocs (bfd
*abfd ATTRIBUTE_UNUSED
, asection
*sec
, FILE *stream
)
636 segment_info_type
*seginfo
= seg_info (sec
);
637 fixS
*fixp
= seginfo
->fix_root
;
642 fprintf (stream
, "sec %s relocs:\n", sec
->name
);
645 symbolS
*s
= fixp
->fx_addsy
;
647 fprintf (stream
, " %08lx: type %d ", (unsigned long) fixp
,
648 (int) fixp
->fx_r_type
);
650 fprintf (stream
, "no sym\n");
653 print_symbol_value_1 (stream
, s
);
654 fprintf (stream
, "\n");
656 fixp
= fixp
->fx_next
;
660 #define dump_section_relocs(ABFD,SEC,STREAM) ((void) 0)
663 #ifndef EMIT_SECTION_SYMBOLS
664 #define EMIT_SECTION_SYMBOLS 1
667 /* Resolve U.A.OFFSET_SYM and U.A.SYM fields of RELOC_LIST entries,
668 and check for validity. Convert RELOC_LIST from using U.A fields
671 resolve_reloc_expr_symbols (void)
673 bfd_vma addr_mask
= 1;
674 struct reloc_list
*r
;
676 /* Avoid a shift by the width of type. */
677 addr_mask
<<= bfd_arch_bits_per_address (stdoutput
) - 1;
681 for (r
= reloc_list
; r
; r
= r
->next
)
683 reloc_howto_type
*howto
= r
->u
.a
.howto
;
686 bfd_vma offset
, addend
;
689 resolve_symbol_value (r
->u
.a
.offset_sym
);
690 symval
= symbol_get_value_expression (r
->u
.a
.offset_sym
);
694 if (symval
->X_op
== O_constant
)
695 sym
= r
->u
.a
.offset_sym
;
696 else if (symval
->X_op
== O_symbol
)
698 sym
= symval
->X_add_symbol
;
699 offset
= symval
->X_add_number
;
700 symval
= symbol_get_value_expression (symval
->X_add_symbol
);
703 || symval
->X_op
!= O_constant
704 || (sec
= S_GET_SEGMENT (sym
)) == NULL
705 || !SEG_NORMAL (sec
))
707 as_bad_where (r
->file
, r
->line
, _("invalid offset expression"));
711 offset
+= S_GET_VALUE (sym
);
714 addend
= r
->u
.a
.addend
;
715 if (r
->u
.a
.sym
!= NULL
)
717 resolve_symbol_value (r
->u
.a
.sym
);
718 symval
= symbol_get_value_expression (r
->u
.a
.sym
);
719 if (symval
->X_op
== O_constant
)
721 else if (symval
->X_op
== O_symbol
)
723 sym
= symval
->X_add_symbol
;
724 addend
+= symval
->X_add_number
;
725 symval
= symbol_get_value_expression (symval
->X_add_symbol
);
727 if (symval
->X_op
!= O_constant
)
729 as_bad_where (r
->file
, r
->line
, _("invalid reloc expression"));
732 else if (sym
!= NULL
&& sec
!= NULL
)
734 /* Convert relocs against local symbols to refer to the
735 corresponding section symbol plus offset instead. Keep
736 PC-relative relocs of the REL variety intact though to
737 prevent the offset from overflowing the relocated field,
738 unless it has enough bits to cover the whole address
740 if (S_IS_LOCAL (sym
) && !symbol_section_p (sym
)
742 || (howto
->partial_inplace
743 && (!howto
->pc_relative
744 || howto
->src_mask
== addr_mask
))))
746 asection
*symsec
= S_GET_SEGMENT (sym
);
747 if (!(((symsec
->flags
& SEC_MERGE
) != 0
749 || (symsec
->flags
& SEC_THREAD_LOCAL
) != 0))
751 addend
+= S_GET_VALUE (sym
);
752 sym
= section_symbol (symsec
);
755 symbol_mark_used_in_reloc (sym
);
760 if (abs_section_sym
== NULL
)
761 abs_section_sym
= section_symbol (absolute_section
);
762 sym
= abs_section_sym
;
766 r
->u
.b
.s
= symbol_get_bfdsym (sym
);
767 r
->u
.b
.r
.sym_ptr_ptr
= &r
->u
.b
.s
;
768 r
->u
.b
.r
.address
= offset
;
769 r
->u
.b
.r
.addend
= addend
;
770 r
->u
.b
.r
.howto
= howto
;
774 /* This pass over fixups decides whether symbols can be replaced with
778 adjust_reloc_syms (bfd
*abfd ATTRIBUTE_UNUSED
,
780 void *xxx ATTRIBUTE_UNUSED
)
782 segment_info_type
*seginfo
= seg_info (sec
);
788 dump_section_relocs (abfd
, sec
, stderr
);
790 for (fixp
= seginfo
->fix_root
; fixp
; fixp
= fixp
->fx_next
)
794 else if (fixp
->fx_addsy
)
800 fprintf (stderr
, "\n\nadjusting fixup:\n");
804 sym
= fixp
->fx_addsy
;
806 /* All symbols should have already been resolved at this
807 point. It is possible to see unresolved expression
808 symbols, though, since they are not in the regular symbol
810 resolve_symbol_value (sym
);
812 if (fixp
->fx_subsy
!= NULL
)
813 resolve_symbol_value (fixp
->fx_subsy
);
815 /* If this symbol is equated to an undefined or common symbol,
816 convert the fixup to being against that symbol. */
817 while (symbol_equated_reloc_p (sym
)
818 || S_IS_WEAKREFR (sym
))
820 symbolS
*newsym
= symbol_get_value_expression (sym
)->X_add_symbol
;
823 fixp
->fx_offset
+= symbol_get_value_expression (sym
)->X_add_number
;
824 fixp
->fx_addsy
= newsym
;
828 if (symbol_mri_common_p (sym
))
830 fixp
->fx_offset
+= S_GET_VALUE (sym
);
831 fixp
->fx_addsy
= symbol_get_value_expression (sym
)->X_add_symbol
;
835 /* If the symbol is undefined, common, weak, or global (ELF
836 shared libs), we can't replace it with the section symbol. */
837 if (S_FORCE_RELOC (fixp
->fx_addsy
, 1))
840 /* Is there some other (target cpu dependent) reason we can't adjust
841 this one? (E.g. relocations involving function addresses on
843 #ifdef tc_fix_adjustable
844 if (! tc_fix_adjustable (fixp
))
848 /* Since we're reducing to section symbols, don't attempt to reduce
849 anything that's already using one. */
850 if (symbol_section_p (sym
))
853 symsec
= S_GET_SEGMENT (sym
);
857 if (bfd_is_abs_section (symsec
)
858 || symsec
== reg_section
)
860 /* The fixup_segment routine normally will not use this
861 symbol in a relocation. */
865 /* Don't try to reduce relocs which refer to non-local symbols
866 in .linkonce sections. It can lead to confusion when a
867 debugging section refers to a .linkonce section. I hope
868 this will always be correct. */
869 if (symsec
!= sec
&& ! S_IS_LOCAL (sym
))
871 if ((symsec
->flags
& SEC_LINK_ONCE
) != 0
873 /* The GNU toolchain uses an extension for ELF: a
874 section beginning with the magic string
875 .gnu.linkonce is a linkonce section. */
876 && strncmp (segment_name (symsec
), ".gnu.linkonce",
877 sizeof ".gnu.linkonce" - 1) == 0))
881 /* Never adjust a reloc against local symbol in a merge section
882 with non-zero addend. */
883 if ((symsec
->flags
& SEC_MERGE
) != 0
884 && (fixp
->fx_offset
!= 0 || fixp
->fx_subsy
!= NULL
))
887 /* Never adjust a reloc against TLS local symbol. */
888 if ((symsec
->flags
& SEC_THREAD_LOCAL
) != 0)
891 /* We refetch the segment when calling section_symbol, rather
892 than using symsec, because S_GET_VALUE may wind up changing
893 the section when it calls resolve_symbol_value. */
894 fixp
->fx_offset
+= S_GET_VALUE (sym
);
895 fixp
->fx_addsy
= section_symbol (S_GET_SEGMENT (sym
));
897 fprintf (stderr
, "\nadjusted fixup:\n");
902 dump_section_relocs (abfd
, sec
, stderr
);
907 Go through all the fixS's in a segment and see which ones can be
908 handled now. (These consist of fixS where we have since discovered
909 the value of a symbol, or the address of the frag involved.)
910 For each one, call md_apply_fix to put the fix into the frag data.
911 Ones that we couldn't completely handle here will be output later
912 by emit_relocations. */
915 fixup_segment (fixS
*fixP
, segT this_segment
)
919 segT add_symbol_segment
= absolute_section
;
921 if (fixP
!= NULL
&& abs_section_sym
== NULL
)
922 abs_section_sym
= section_symbol (absolute_section
);
924 /* If the linker is doing the relaxing, we must not do any fixups.
926 Well, strictly speaking that's not true -- we could do any that
927 are PC-relative and don't cross regions that could change size. */
928 if (linkrelax
&& TC_LINKRELAX_FIXUP (this_segment
))
930 for (; fixP
; fixP
= fixP
->fx_next
)
933 if (fixP
->fx_addsy
== NULL
)
935 /* There was no symbol required by this relocation.
936 However, BFD doesn't really handle relocations
937 without symbols well. So fake up a local symbol in
938 the absolute section. */
939 fixP
->fx_addsy
= abs_section_sym
;
941 symbol_mark_used_in_reloc (fixP
->fx_addsy
);
942 if (fixP
->fx_subsy
!= NULL
)
943 symbol_mark_used_in_reloc (fixP
->fx_subsy
);
948 for (; fixP
; fixP
= fixP
->fx_next
)
951 fprintf (stderr
, "\nprocessing fixup:\n");
955 fragP
= fixP
->fx_frag
;
957 #ifdef TC_VALIDATE_FIX
958 TC_VALIDATE_FIX (fixP
, this_segment
, skip
);
960 add_number
= fixP
->fx_offset
;
962 if (fixP
->fx_addsy
!= NULL
)
963 add_symbol_segment
= S_GET_SEGMENT (fixP
->fx_addsy
);
965 if (fixP
->fx_subsy
!= NULL
)
967 segT sub_symbol_segment
;
968 resolve_symbol_value (fixP
->fx_subsy
);
969 sub_symbol_segment
= S_GET_SEGMENT (fixP
->fx_subsy
);
970 if (fixP
->fx_addsy
!= NULL
971 && sub_symbol_segment
== add_symbol_segment
972 && !S_FORCE_RELOC (fixP
->fx_addsy
, 0)
973 && !S_FORCE_RELOC (fixP
->fx_subsy
, 0)
974 && !TC_FORCE_RELOCATION_SUB_SAME (fixP
, add_symbol_segment
))
976 add_number
+= S_GET_VALUE (fixP
->fx_addsy
);
977 add_number
-= S_GET_VALUE (fixP
->fx_subsy
);
978 fixP
->fx_offset
= add_number
;
979 fixP
->fx_addsy
= NULL
;
980 fixP
->fx_subsy
= NULL
;
982 /* See the comment below about 68k weirdness. */
986 else if (sub_symbol_segment
== absolute_section
987 && !S_FORCE_RELOC (fixP
->fx_subsy
, 0)
988 && !TC_FORCE_RELOCATION_SUB_ABS (fixP
, add_symbol_segment
))
990 add_number
-= S_GET_VALUE (fixP
->fx_subsy
);
991 fixP
->fx_offset
= add_number
;
992 fixP
->fx_subsy
= NULL
;
994 else if (sub_symbol_segment
== this_segment
995 && !S_FORCE_RELOC (fixP
->fx_subsy
, 0)
996 && !TC_FORCE_RELOCATION_SUB_LOCAL (fixP
, add_symbol_segment
))
998 add_number
-= S_GET_VALUE (fixP
->fx_subsy
);
999 fixP
->fx_offset
= (add_number
+ fixP
->fx_dot_value
1000 + fixP
->fx_dot_frag
->fr_address
);
1002 /* Make it pc-relative. If the back-end code has not
1003 selected a pc-relative reloc, cancel the adjustment
1004 we do later on all pc-relative relocs. */
1007 /* Do this for m68k even if it's already described
1008 as pc-relative. On the m68k, an operand of
1009 "pc@(foo-.-2)" should address "foo" in a
1010 pc-relative mode. */
1014 add_number
+= MD_PCREL_FROM_SECTION (fixP
, this_segment
);
1015 fixP
->fx_subsy
= NULL
;
1018 else if (!TC_VALIDATE_FIX_SUB (fixP
, add_symbol_segment
))
1020 if (!md_register_arithmetic
1021 && (add_symbol_segment
== reg_section
1022 || sub_symbol_segment
== reg_section
))
1023 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1024 _("register value used as expression"));
1026 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1027 _("can't resolve `%s' {%s section} - `%s' {%s section}"),
1028 fixP
->fx_addsy
? S_GET_NAME (fixP
->fx_addsy
) : "0",
1029 segment_name (add_symbol_segment
),
1030 S_GET_NAME (fixP
->fx_subsy
),
1031 segment_name (sub_symbol_segment
));
1033 else if (sub_symbol_segment
!= undefined_section
1034 && ! bfd_is_com_section (sub_symbol_segment
)
1035 && MD_APPLY_SYM_VALUE (fixP
))
1036 add_number
-= S_GET_VALUE (fixP
->fx_subsy
);
1041 if (add_symbol_segment
== this_segment
1042 && !S_FORCE_RELOC (fixP
->fx_addsy
, 0)
1043 && !TC_FORCE_RELOCATION_LOCAL (fixP
))
1045 /* This fixup was made when the symbol's segment was
1046 SEG_UNKNOWN, but it is now in the local segment.
1047 So we know how to do the address without relocation. */
1048 add_number
+= S_GET_VALUE (fixP
->fx_addsy
);
1049 fixP
->fx_offset
= add_number
;
1051 add_number
-= MD_PCREL_FROM_SECTION (fixP
, this_segment
);
1052 fixP
->fx_addsy
= NULL
;
1055 else if (add_symbol_segment
== absolute_section
1056 && !S_FORCE_RELOC (fixP
->fx_addsy
, 0)
1057 && !TC_FORCE_RELOCATION_ABS (fixP
))
1059 add_number
+= S_GET_VALUE (fixP
->fx_addsy
);
1060 fixP
->fx_offset
= add_number
;
1061 fixP
->fx_addsy
= NULL
;
1063 else if (add_symbol_segment
!= undefined_section
1064 && ! bfd_is_com_section (add_symbol_segment
)
1065 && MD_APPLY_SYM_VALUE (fixP
))
1066 add_number
+= S_GET_VALUE (fixP
->fx_addsy
);
1071 add_number
-= MD_PCREL_FROM_SECTION (fixP
, this_segment
);
1072 if (!fixP
->fx_done
&& fixP
->fx_addsy
== NULL
)
1074 /* There was no symbol required by this relocation.
1075 However, BFD doesn't really handle relocations
1076 without symbols well. So fake up a local symbol in
1077 the absolute section. */
1078 fixP
->fx_addsy
= abs_section_sym
;
1083 md_apply_fix (fixP
, &add_number
, this_segment
);
1087 if (fixP
->fx_addsy
== NULL
)
1088 fixP
->fx_addsy
= abs_section_sym
;
1089 symbol_mark_used_in_reloc (fixP
->fx_addsy
);
1090 if (fixP
->fx_subsy
!= NULL
)
1091 symbol_mark_used_in_reloc (fixP
->fx_subsy
);
1094 if (!fixP
->fx_no_overflow
&& fixP
->fx_size
!= 0)
1096 if (fixP
->fx_size
< sizeof (valueT
))
1101 mask
--; /* Set all bits to one. */
1102 mask
<<= fixP
->fx_size
* 8 - (fixP
->fx_signed
? 1 : 0);
1103 if ((add_number
& mask
) != 0 && (add_number
& mask
) != mask
)
1105 char buf
[50], buf2
[50];
1106 sprint_value (buf
, fragP
->fr_address
+ fixP
->fx_where
);
1107 if (add_number
> 1000)
1108 sprint_value (buf2
, add_number
);
1110 sprintf (buf2
, "%ld", (long) add_number
);
1111 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1112 ngettext ("value of %s too large for field "
1114 "value of %s too large for field "
1115 "of %d bytes at %s",
1117 buf2
, fixP
->fx_size
, buf
);
1118 } /* Generic error checking. */
1120 #ifdef WARN_SIGNED_OVERFLOW_WORD
1121 /* Warn if a .word value is too large when treated as a signed
1122 number. We already know it is not too negative. This is to
1123 catch over-large switches generated by gcc on the 68k. */
1124 if (!flag_signed_overflow_ok
1125 && fixP
->fx_size
== 2
1126 && add_number
> 0x7fff)
1127 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1128 _("signed .word overflow; switch may be too large; %ld at 0x%lx"),
1130 (long) (fragP
->fr_address
+ fixP
->fx_where
));
1134 #ifdef TC_VALIDATE_FIX
1135 skip
: ATTRIBUTE_UNUSED_LABEL
1139 fprintf (stderr
, "result:\n");
1142 } /* For each fixS in this segment. */
1146 fix_segment (bfd
*abfd ATTRIBUTE_UNUSED
,
1148 void *xxx ATTRIBUTE_UNUSED
)
1150 segment_info_type
*seginfo
= seg_info (sec
);
1152 fixup_segment (seginfo
->fix_root
, sec
);
1156 install_reloc (asection
*sec
, arelent
*reloc
, fragS
*fragp
,
1157 const char *file
, unsigned int line
)
1160 bfd_reloc_status_type s
;
1163 if (reloc
->sym_ptr_ptr
!= NULL
1164 && (sym
= *reloc
->sym_ptr_ptr
) != NULL
1165 && (sym
->flags
& BSF_KEEP
) == 0
1166 && ((sym
->flags
& BSF_SECTION_SYM
) == 0
1167 || (EMIT_SECTION_SYMBOLS
1168 && !bfd_is_abs_section (sym
->section
))))
1169 as_bad_where (file
, line
, _("redefined symbol cannot be used on reloc"));
1171 s
= bfd_install_relocation (stdoutput
, reloc
,
1172 fragp
->fr_literal
, fragp
->fr_address
,
1178 case bfd_reloc_overflow
:
1179 as_bad_where (file
, line
, _("relocation overflow"));
1181 case bfd_reloc_outofrange
:
1182 as_bad_where (file
, line
, _("relocation out of range"));
1185 as_fatal (_("%s:%u: bad return from bfd_install_relocation: %x"),
1191 get_frag_for_reloc (fragS
*last_frag
,
1192 const segment_info_type
*seginfo
,
1193 const struct reloc_list
*r
)
1197 for (f
= last_frag
; f
!= NULL
; f
= f
->fr_next
)
1198 if (f
->fr_address
<= r
->u
.b
.r
.address
1199 && r
->u
.b
.r
.address
< f
->fr_address
+ f
->fr_fix
)
1202 for (f
= seginfo
->frchainP
->frch_root
; f
!= NULL
; f
= f
->fr_next
)
1203 if (f
->fr_address
<= r
->u
.b
.r
.address
1204 && r
->u
.b
.r
.address
< f
->fr_address
+ f
->fr_fix
)
1207 for (f
= seginfo
->frchainP
->frch_root
; f
!= NULL
; f
= f
->fr_next
)
1208 if (f
->fr_address
<= r
->u
.b
.r
.address
1209 && r
->u
.b
.r
.address
<= f
->fr_address
+ f
->fr_fix
)
1212 as_bad_where (r
->file
, r
->line
,
1213 _("reloc not within (fixed part of) section"));
1218 write_relocs (bfd
*abfd ATTRIBUTE_UNUSED
, asection
*sec
,
1219 void *xxx ATTRIBUTE_UNUSED
)
1221 segment_info_type
*seginfo
= seg_info (sec
);
1223 struct reloc_list
*my_reloc_list
, **rp
, *r
;
1228 /* If seginfo is NULL, we did not create this section; don't do
1229 anything with it. */
1230 if (seginfo
== NULL
)
1234 for (fixp
= seginfo
->fix_root
; fixp
; fixp
= fixp
->fx_next
)
1238 #ifdef RELOC_EXPANSION_POSSIBLE
1239 n
*= MAX_RELOC_EXPANSION
;
1242 /* Extract relocs for this section from reloc_list. */
1245 my_reloc_list
= NULL
;
1246 while ((r
= *rp
) != NULL
)
1248 if (r
->u
.b
.sec
== sec
)
1251 r
->next
= my_reloc_list
;
1259 relocs
= XCNEWVEC (arelent
*, n
);
1264 for (fixp
= seginfo
->fix_root
; fixp
!= (fixS
*) NULL
; fixp
= fixp
->fx_next
)
1269 #ifndef RELOC_EXPANSION_POSSIBLE
1278 fx_size
= fixp
->fx_size
;
1279 slack
= TC_FX_SIZE_SLACK (fixp
);
1281 fx_size
= fx_size
> slack
? fx_size
- slack
: 0;
1282 loc
= fixp
->fx_where
+ fx_size
;
1283 if (slack
>= 0 && loc
> fixp
->fx_frag
->fr_fix
)
1284 as_bad_where (fixp
->fx_file
, fixp
->fx_line
,
1285 _("internal error: fixup not contained within frag"));
1287 #ifndef RELOC_EXPANSION_POSSIBLE
1288 *reloc
= tc_gen_reloc (sec
, fixp
);
1290 reloc
= tc_gen_reloc (sec
, fixp
);
1295 while (r
!= NULL
&& r
->u
.b
.r
.address
< (*reloc
)->address
)
1297 fragS
*f
= get_frag_for_reloc (last_frag
, seginfo
, r
);
1301 relocs
[n
++] = &r
->u
.b
.r
;
1302 install_reloc (sec
, &r
->u
.b
.r
, f
, r
->file
, r
->line
);
1306 relocs
[n
++] = *reloc
;
1307 install_reloc (sec
, *reloc
, fixp
->fx_frag
,
1308 fixp
->fx_file
, fixp
->fx_line
);
1309 #ifndef RELOC_EXPANSION_POSSIBLE
1319 fragS
*f
= get_frag_for_reloc (last_frag
, seginfo
, r
);
1323 relocs
[n
++] = &r
->u
.b
.r
;
1324 install_reloc (sec
, &r
->u
.b
.r
, f
, r
->file
, r
->line
);
1331 unsigned int k
, j
, nsyms
;
1333 sympp
= bfd_get_outsymbols (stdoutput
);
1334 nsyms
= bfd_get_symcount (stdoutput
);
1335 for (k
= 0; k
< n
; k
++)
1336 if (((*relocs
[k
]->sym_ptr_ptr
)->flags
& BSF_SECTION_SYM
) == 0)
1338 for (j
= 0; j
< nsyms
; j
++)
1339 if (sympp
[j
] == *relocs
[k
]->sym_ptr_ptr
)
1349 flagword flags
= bfd_section_flags (sec
);
1351 bfd_set_section_flags (sec
, flags
);
1352 bfd_set_reloc (stdoutput
, sec
, relocs
, n
);
1355 #ifdef SET_SECTION_RELOCS
1356 SET_SECTION_RELOCS (sec
, relocs
, n
);
1363 fprintf (stderr
, "relocs for sec %s\n", sec
->name
);
1364 for (k
= 0; k
< n
; k
++)
1366 arelent
*rel
= relocs
[k
];
1367 asymbol
*s
= *rel
->sym_ptr_ptr
;
1368 fprintf (stderr
, " reloc %2d @%p off %4lx : sym %-10s addend %lx\n",
1369 k
, rel
, (unsigned long)rel
->address
, s
->name
,
1370 (unsigned long)rel
->addend
);
1377 compress_frag (struct z_stream_s
*strm
, const char *contents
, int in_size
,
1378 fragS
**last_newf
, struct obstack
*ob
)
1381 int total_out_size
= 0;
1382 fragS
*f
= *last_newf
;
1386 /* Call the compression routine repeatedly until it has finished
1387 processing the frag. */
1390 /* Reserve all the space available in the current chunk.
1391 If none is available, start a new frag. */
1392 avail_out
= obstack_room (ob
);
1395 obstack_finish (ob
);
1396 f
= frag_alloc (ob
);
1397 f
->fr_type
= rs_fill
;
1398 (*last_newf
)->fr_next
= f
;
1400 avail_out
= obstack_room (ob
);
1403 as_fatal (_("can't extend frag"));
1404 next_out
= obstack_next_free (ob
);
1405 obstack_blank_fast (ob
, avail_out
);
1406 out_size
= compress_data (strm
, &contents
, &in_size
,
1407 &next_out
, &avail_out
);
1411 f
->fr_fix
+= out_size
;
1412 total_out_size
+= out_size
;
1414 /* Return unused space. */
1416 obstack_blank_fast (ob
, -avail_out
);
1419 return total_out_size
;
1423 compress_debug (bfd
*abfd
, asection
*sec
, void *xxx ATTRIBUTE_UNUSED
)
1425 segment_info_type
*seginfo
= seg_info (sec
);
1429 struct obstack
*ob
= &seginfo
->frchainP
->frch_obstack
;
1430 bfd_size_type uncompressed_size
= (bfd_size_type
) sec
->size
;
1431 bfd_size_type compressed_size
;
1432 const char *section_name
;
1433 char *compressed_name
;
1435 struct z_stream_s
*strm
;
1437 flagword flags
= bfd_section_flags (sec
);
1438 unsigned int header_size
, compression_header_size
;
1442 || (flags
& (SEC_ALLOC
| SEC_HAS_CONTENTS
)) == SEC_ALLOC
)
1445 section_name
= bfd_section_name (sec
);
1446 if (strncmp (section_name
, ".debug_", 7) != 0)
1449 strm
= compress_init ();
1453 if (flag_compress_debug
== COMPRESS_DEBUG_GABI_ZLIB
)
1455 compression_header_size
1456 = bfd_get_compression_header_size (stdoutput
, NULL
);
1457 header_size
= compression_header_size
;
1461 compression_header_size
= 0;
1465 /* Create a new frag to contain the compression header. */
1466 first_newf
= frag_alloc (ob
);
1467 if (obstack_room (ob
) < header_size
)
1468 first_newf
= frag_alloc (ob
);
1469 if (obstack_room (ob
) < header_size
)
1470 as_fatal (ngettext ("can't extend frag %lu char",
1471 "can't extend frag %lu chars",
1472 (unsigned long) header_size
),
1473 (unsigned long) header_size
);
1474 last_newf
= first_newf
;
1475 obstack_blank_fast (ob
, header_size
);
1476 last_newf
->fr_type
= rs_fill
;
1477 last_newf
->fr_fix
= header_size
;
1478 header
= last_newf
->fr_literal
;
1479 compressed_size
= header_size
;
1481 /* Stream the frags through the compression engine, adding new frags
1482 as necessary to accommodate the compressed output. */
1483 for (f
= seginfo
->frchainP
->frch_root
;
1492 gas_assert (f
->fr_type
== rs_fill
);
1495 out_size
= compress_frag (strm
, f
->fr_literal
, f
->fr_fix
,
1499 compressed_size
+= out_size
;
1501 fill_literal
= f
->fr_literal
+ f
->fr_fix
;
1502 fill_size
= f
->fr_var
;
1503 count
= f
->fr_offset
;
1504 gas_assert (count
>= 0);
1505 if (fill_size
&& count
)
1509 out_size
= compress_frag (strm
, fill_literal
, (int) fill_size
,
1513 compressed_size
+= out_size
;
1518 /* Flush the compression state. */
1525 /* Reserve all the space available in the current chunk.
1526 If none is available, start a new frag. */
1527 avail_out
= obstack_room (ob
);
1532 obstack_finish (ob
);
1533 newf
= frag_alloc (ob
);
1534 newf
->fr_type
= rs_fill
;
1535 last_newf
->fr_next
= newf
;
1537 avail_out
= obstack_room (ob
);
1540 as_fatal (_("can't extend frag"));
1541 next_out
= obstack_next_free (ob
);
1542 obstack_blank_fast (ob
, avail_out
);
1543 x
= compress_finish (strm
, &next_out
, &avail_out
, &out_size
);
1547 last_newf
->fr_fix
+= out_size
;
1548 compressed_size
+= out_size
;
1550 /* Return unused space. */
1552 obstack_blank_fast (ob
, -avail_out
);
1558 /* PR binutils/18087: If compression didn't make the section smaller,
1559 just keep it uncompressed. */
1560 if (compressed_size
>= uncompressed_size
)
1563 /* Replace the uncompressed frag list with the compressed frag list. */
1564 seginfo
->frchainP
->frch_root
= first_newf
;
1565 seginfo
->frchainP
->frch_last
= last_newf
;
1567 /* Update the section size and its name. */
1568 bfd_update_compression_header (abfd
, (bfd_byte
*) header
, sec
);
1569 x
= bfd_set_section_size (sec
, compressed_size
);
1571 if (!compression_header_size
)
1573 compressed_name
= concat (".z", section_name
+ 1, (char *) NULL
);
1574 bfd_rename_section (sec
, compressed_name
);
1578 #ifndef md_generate_nops
1579 /* Genenerate COUNT bytes of no-op instructions to WHERE. A target
1580 backend must override this with proper no-op instructions. */
1583 md_generate_nops (fragS
*f ATTRIBUTE_UNUSED
,
1584 char *where ATTRIBUTE_UNUSED
,
1585 offsetT count ATTRIBUTE_UNUSED
,
1586 int control ATTRIBUTE_UNUSED
)
1588 as_bad (_("unimplemented .nops directive"));
1593 write_contents (bfd
*abfd ATTRIBUTE_UNUSED
,
1595 void *xxx ATTRIBUTE_UNUSED
)
1597 segment_info_type
*seginfo
= seg_info (sec
);
1598 addressT offset
= 0;
1601 /* Write out the frags. */
1603 || !(bfd_section_flags (sec
) & SEC_HAS_CONTENTS
))
1606 for (f
= seginfo
->frchainP
->frch_root
;
1615 gas_assert (f
->fr_type
== rs_fill
|| f
->fr_type
== rs_fill_nop
);
1618 x
= bfd_set_section_contents (stdoutput
, sec
,
1619 f
->fr_literal
, (file_ptr
) offset
,
1620 (bfd_size_type
) f
->fr_fix
);
1622 as_fatal (ngettext ("can't write %ld byte "
1623 "to section %s of %s: '%s'",
1624 "can't write %ld bytes "
1625 "to section %s of %s: '%s'",
1628 sec
->name
, stdoutput
->filename
,
1629 bfd_errmsg (bfd_get_error ()));
1630 offset
+= f
->fr_fix
;
1633 fill_size
= f
->fr_var
;
1634 count
= f
->fr_offset
;
1635 fill_literal
= f
->fr_literal
+ f
->fr_fix
;
1637 if (f
->fr_type
== rs_fill_nop
)
1639 gas_assert (count
>= 0 && fill_size
== 1);
1642 char *buf
= xmalloc (count
);
1643 md_generate_nops (f
, buf
, count
, *fill_literal
);
1644 x
= bfd_set_section_contents
1645 (stdoutput
, sec
, buf
, (file_ptr
) offset
,
1646 (bfd_size_type
) count
);
1648 as_fatal (ngettext ("can't fill %ld byte "
1649 "in section %s of %s: '%s'",
1650 "can't fill %ld bytes "
1651 "in section %s of %s: '%s'",
1652 (long) count
), (long) count
,
1653 sec
->name
, stdoutput
->filename
,
1654 bfd_errmsg (bfd_get_error ()));
1661 gas_assert (count
>= 0);
1662 if (fill_size
&& count
)
1665 if (fill_size
> sizeof (buf
))
1667 /* Do it the old way. Can this ever happen? */
1670 x
= bfd_set_section_contents (stdoutput
, sec
,
1673 (bfd_size_type
) fill_size
);
1675 as_fatal (ngettext ("can't fill %ld byte "
1676 "in section %s of %s: '%s'",
1677 "can't fill %ld bytes "
1678 "in section %s of %s: '%s'",
1681 sec
->name
, stdoutput
->filename
,
1682 bfd_errmsg (bfd_get_error ()));
1683 offset
+= fill_size
;
1688 /* Build a buffer full of fill objects and output it as
1689 often as necessary. This saves on the overhead of
1690 potentially lots of bfd_set_section_contents calls. */
1694 n_per_buf
= sizeof (buf
);
1695 memset (buf
, *fill_literal
, n_per_buf
);
1700 n_per_buf
= sizeof (buf
) / fill_size
;
1701 for (i
= n_per_buf
, bufp
= buf
; i
; i
--, bufp
+= fill_size
)
1702 memcpy (bufp
, fill_literal
, fill_size
);
1704 for (; count
> 0; count
-= n_per_buf
)
1706 n_per_buf
= n_per_buf
> count
? count
: n_per_buf
;
1707 x
= bfd_set_section_contents
1708 (stdoutput
, sec
, buf
, (file_ptr
) offset
,
1709 (bfd_size_type
) n_per_buf
* fill_size
);
1711 as_fatal (ngettext ("can't fill %ld byte "
1712 "in section %s of %s: '%s'",
1713 "can't fill %ld bytes "
1714 "in section %s of %s: '%s'",
1715 (long) (n_per_buf
* fill_size
)),
1716 (long) (n_per_buf
* fill_size
),
1717 sec
->name
, stdoutput
->filename
,
1718 bfd_errmsg (bfd_get_error ()));
1719 offset
+= n_per_buf
* fill_size
;
1727 merge_data_into_text (void)
1729 seg_info (text_section
)->frchainP
->frch_last
->fr_next
=
1730 seg_info (data_section
)->frchainP
->frch_root
;
1731 seg_info (text_section
)->frchainP
->frch_last
=
1732 seg_info (data_section
)->frchainP
->frch_last
;
1733 seg_info (data_section
)->frchainP
= 0;
1744 /* Count symbols. We can't rely on a count made by the loop in
1745 write_object_file, because *_frob_file may add a new symbol or
1748 for (symp
= symbol_rootP
; symp
; symp
= symbol_next (symp
))
1754 bfd_size_type amt
= (bfd_size_type
) nsyms
* sizeof (asymbol
*);
1756 asympp
= (asymbol
**) bfd_alloc (stdoutput
, amt
);
1757 symp
= symbol_rootP
;
1758 for (i
= 0; i
< nsyms
; i
++, symp
= symbol_next (symp
))
1760 asympp
[i
] = symbol_get_bfdsym (symp
);
1761 if (asympp
[i
]->flags
!= BSF_SECTION_SYM
1762 || !(bfd_is_const_section (asympp
[i
]->section
)
1763 && asympp
[i
]->section
->symbol
== asympp
[i
]))
1764 asympp
[i
]->flags
|= BSF_KEEP
;
1765 symbol_mark_written (symp
);
1770 result
= bfd_set_symtab (stdoutput
, asympp
, nsyms
);
1771 gas_assert (result
);
1772 symbol_table_frozen
= 1;
1775 /* Finish the subsegments. After every sub-segment, we fake an
1776 ".align ...". This conforms to BSD4.2 brain-damage. We then fake
1777 ".fill 0" because that is the kind of frag that requires least
1778 thought. ".align" frags like to have a following frag since that
1779 makes calculating their intended length trivial. */
1781 #ifndef SUB_SEGMENT_ALIGN
1783 /* The last subsegment gets an alignment corresponding to the alignment
1784 of the section. This allows proper nop-filling at the end of
1785 code-bearing sections. */
1786 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) \
1787 (!(FRCHAIN)->frch_next && subseg_text_p (SEG) \
1788 && !do_not_pad_sections_to_alignment \
1789 ? get_recorded_alignment (SEG) \
1792 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) 0
1797 subsegs_finish_section (asection
*s
)
1799 struct frchain
*frchainP
;
1800 segment_info_type
*seginfo
= seg_info (s
);
1804 for (frchainP
= seginfo
->frchainP
;
1806 frchainP
= frchainP
->frch_next
)
1810 subseg_set (s
, frchainP
->frch_subseg
);
1812 /* This now gets called even if we had errors. In that case,
1813 any alignment is meaningless, and, moreover, will look weird
1814 if we are generating a listing. */
1816 do_not_pad_sections_to_alignment
= 1;
1818 alignment
= SUB_SEGMENT_ALIGN (now_seg
, frchainP
);
1819 if ((bfd_section_flags (now_seg
) & SEC_MERGE
)
1820 && now_seg
->entsize
)
1822 unsigned int entsize
= now_seg
->entsize
;
1825 while ((entsize
& 1) == 0)
1831 if (entalign
> alignment
)
1832 alignment
= entalign
;
1835 if (subseg_text_p (now_seg
))
1836 frag_align_code (alignment
, 0);
1838 frag_align (alignment
, 0, 0);
1840 /* frag_align will have left a new frag.
1841 Use this last frag for an empty ".fill".
1843 For this segment ...
1844 Create a last frag. Do not leave a "being filled in frag". */
1845 frag_wane (frag_now
);
1846 frag_now
->fr_fix
= 0;
1847 know (frag_now
->fr_next
== NULL
);
1852 subsegs_finish (void)
1856 for (s
= stdoutput
->sections
; s
; s
= s
->next
)
1857 subsegs_finish_section (s
);
1862 create_obj_attrs_section (void)
1869 size
= bfd_elf_obj_attr_size (stdoutput
);
1873 name
= get_elf_backend_data (stdoutput
)->obj_attrs_section
;
1875 name
= ".gnu.attributes";
1876 s
= subseg_new (name
, 0);
1877 elf_section_type (s
)
1878 = get_elf_backend_data (stdoutput
)->obj_attrs_section_type
;
1879 bfd_set_section_flags (s
, SEC_READONLY
| SEC_DATA
);
1881 p
= frag_more (size
);
1882 bfd_elf_set_obj_attr_contents (stdoutput
, (bfd_byte
*)p
, size
);
1884 subsegs_finish_section (s
);
1885 relax_segment (seg_info (s
)->frchainP
->frch_root
, s
, 0);
1886 size_seg (stdoutput
, s
, NULL
);
1889 /* Create a relocation against an entry in a GNU Build attribute section. */
1892 create_note_reloc (segT sec
,
1894 bfd_size_type note_offset
,
1895 bfd_size_type desc2_offset
,
1900 struct reloc_list
* reloc
;
1902 reloc
= XNEW (struct reloc_list
);
1904 /* We create a .b type reloc as resolve_reloc_expr_symbols() has already been called. */
1905 reloc
->u
.b
.sec
= sec
;
1906 reloc
->u
.b
.s
= symbol_get_bfdsym (sym
);
1907 reloc
->u
.b
.r
.sym_ptr_ptr
= & reloc
->u
.b
.s
;
1908 reloc
->u
.b
.r
.address
= note_offset
+ desc2_offset
;
1909 reloc
->u
.b
.r
.addend
= addend
;
1910 reloc
->u
.b
.r
.howto
= bfd_reloc_type_lookup (stdoutput
, reloc_type
);
1912 if (reloc
->u
.b
.r
.howto
== NULL
)
1914 as_bad (_("unable to create reloc for build note"));
1918 reloc
->file
= N_("<gnu build note>");
1921 reloc
->next
= reloc_list
;
1924 /* For REL relocs, store the addend in the section. */
1925 if (! sec
->use_rela_p
1926 /* The SH target is a special case that uses RELA relocs
1927 but still stores the addend in the word being relocated. */
1928 || strstr (bfd_get_target (stdoutput
), "-sh") != NULL
)
1930 if (target_big_endian
)
1932 if (bfd_arch_bits_per_address (stdoutput
) <= 32)
1933 note
[desc2_offset
+ 3] = addend
;
1935 note
[desc2_offset
+ 7] = addend
;
1938 note
[desc2_offset
] = addend
;
1943 maybe_generate_build_notes (void)
1950 offsetT desc2_offset
;
1955 if (! flag_generate_build_notes
1956 || bfd_get_section_by_name (stdoutput
,
1957 GNU_BUILD_ATTRS_SECTION_NAME
) != NULL
)
1960 /* Create a GNU Build Attribute section. */
1961 sec
= subseg_new (GNU_BUILD_ATTRS_SECTION_NAME
, FALSE
);
1962 elf_section_type (sec
) = SHT_NOTE
;
1963 bfd_set_section_flags (sec
, (SEC_READONLY
| SEC_HAS_CONTENTS
| SEC_DATA
1965 bfd_set_section_alignment (sec
, 2);
1967 /* Work out the size of the notes that we will create,
1968 and the relocation we should use. */
1969 if (bfd_arch_bits_per_address (stdoutput
) <= 32)
1972 desc_size
= 8; /* Two 4-byte offsets. */
1975 /* FIXME: The BFD backend for the CRX target does not support the
1976 BFD_RELOC_32, even though it really should. Likewise for the
1977 CR16 target. So we have special case code here... */
1978 if (strstr (bfd_get_target (stdoutput
), "-crx") != NULL
)
1979 desc_reloc
= BFD_RELOC_CRX_NUM32
;
1980 else if (strstr (bfd_get_target (stdoutput
), "-cr16") != NULL
)
1981 desc_reloc
= BFD_RELOC_CR16_NUM32
;
1983 desc_reloc
= BFD_RELOC_32
;
1988 desc_size
= 16; /* Two 8-byte offsets. */
1990 /* FIXME: The BFD backend for the IA64 target does not support the
1991 BFD_RELOC_64, even though it really should. The HPPA backend
1992 has a similar issue, although it does not support BFD_RELOCs at
1993 all! So we have special case code to handle these targets. */
1994 if (strstr (bfd_get_target (stdoutput
), "-ia64") != NULL
)
1995 desc_reloc
= target_big_endian
? BFD_RELOC_IA64_DIR32MSB
: BFD_RELOC_IA64_DIR32LSB
;
1996 else if (strstr (bfd_get_target (stdoutput
), "-hppa") != NULL
)
1997 desc_reloc
= 80; /* R_PARISC_DIR64. */
1999 desc_reloc
= BFD_RELOC_64
;
2002 /* We have to create a note for *each* code section.
2003 Linker garbage collection might discard some. */
2007 for (sym
= symbol_rootP
; sym
!= NULL
; sym
= symbol_next (sym
))
2008 if ((bsym
= symbol_get_bfdsym (sym
)) != NULL
2009 && bsym
->flags
& BSF_SECTION_SYM
2010 && bsym
->section
!= NULL
2011 /* Skip linkonce sections - we cannot use these section symbols as they may disappear. */
2012 && (bsym
->section
->flags
& (SEC_CODE
| SEC_LINK_ONCE
)) == SEC_CODE
2013 /* Not all linkonce sections are flagged... */
2014 && strncmp (S_GET_NAME (sym
), ".gnu.linkonce", sizeof ".gnu.linkonce" - 1) != 0)
2016 /* Create a version note. */
2018 note
= frag_more (note_size
);
2019 memset (note
, 0, note_size
);
2021 if (target_big_endian
)
2023 note
[3] = 8; /* strlen (name) + 1. */
2024 note
[7] = desc_size
; /* Two 8-byte offsets. */
2025 note
[10] = NT_GNU_BUILD_ATTRIBUTE_OPEN
>> 8;
2026 note
[11] = NT_GNU_BUILD_ATTRIBUTE_OPEN
& 0xff;
2030 note
[0] = 8; /* strlen (name) + 1. */
2031 note
[4] = desc_size
; /* Two 8-byte offsets. */
2032 note
[8] = NT_GNU_BUILD_ATTRIBUTE_OPEN
& 0xff;
2033 note
[9] = NT_GNU_BUILD_ATTRIBUTE_OPEN
>> 8;
2036 /* The a1 version number indicates that this note was
2037 generated by the assembler and not the gcc annobin plugin. */
2038 memcpy (note
+ 12, "GA$\x013a1", 8);
2040 /* Create a relocation to install the start address of the note... */
2041 create_note_reloc (sec
, sym
, total_size
, 20, desc_reloc
, 0, note
);
2043 /* ...and another one to install the end address. */
2044 create_note_reloc (sec
, sym
, total_size
, desc2_offset
, desc_reloc
,
2045 bfd_section_size (bsym
->section
),
2048 total_size
+= note_size
;
2049 /* FIXME: Maybe add a note recording the assembler command line and version ? */
2052 /* Install the note(s) into the section. */
2054 bfd_set_section_contents (stdoutput
, sec
, (bfd_byte
*) note
, 0, total_size
);
2055 subsegs_finish_section (sec
);
2056 relax_segment (seg_info (sec
)->frchainP
->frch_root
, sec
, 0);
2057 size_seg (stdoutput
, sec
, NULL
);
2059 #endif /* OBJ_ELF */
2061 /* Write the object file. */
2064 write_object_file (void)
2066 struct relax_seg_info rsi
;
2067 #ifndef WORKING_DOT_WORD
2068 fragS
*fragP
; /* Track along all frags. */
2073 #ifdef md_pre_output_hook
2077 #ifdef md_pre_relax_hook
2081 /* From now on, we don't care about sub-segments. Build one frag chain
2082 for each segment. Linked through fr_next. */
2084 /* Remove the sections created by gas for its own purposes. */
2088 bfd_section_list_remove (stdoutput
, reg_section
);
2089 bfd_section_list_remove (stdoutput
, expr_section
);
2090 stdoutput
->section_count
-= 2;
2092 bfd_map_over_sections (stdoutput
, renumber_sections
, &i
);
2095 bfd_map_over_sections (stdoutput
, chain_frchains_together
, (char *) 0);
2097 /* We have two segments. If user gave -R flag, then we must put the
2098 data frags into the text segment. Do this before relaxing so
2099 we know to take advantage of -R and make shorter addresses. */
2100 if (flag_readonly_data_in_text
)
2102 merge_data_into_text ();
2108 #ifndef WORKING_DOT_WORD
2109 /* We need to reset the markers in the broken word list and
2110 associated frags between calls to relax_segment (via
2111 relax_seg). Since the broken word list is global, we do it
2112 once per round, rather than locally in relax_segment for each
2114 struct broken_word
*brokp
;
2116 for (brokp
= broken_words
;
2117 brokp
!= (struct broken_word
*) NULL
;
2118 brokp
= brokp
->next_broken_word
)
2122 if (brokp
->dispfrag
!= (fragS
*) NULL
2123 && brokp
->dispfrag
->fr_type
== rs_broken_word
)
2124 brokp
->dispfrag
->fr_subtype
= 0;
2129 bfd_map_over_sections (stdoutput
, relax_seg
, &rsi
);
2135 /* Note - Most ports will use the default value of
2136 TC_FINALIZE_SYMS_BEFORE_SIZE_SEG, which 1. This will force
2137 local symbols to be resolved, removing their frag information.
2138 Some ports however, will not have finished relaxing all of
2139 their frags and will still need the local symbol frag
2140 information. These ports can set
2141 TC_FINALIZE_SYMS_BEFORE_SIZE_SEG to 0. */
2142 finalize_syms
= TC_FINALIZE_SYMS_BEFORE_SIZE_SEG
;
2144 bfd_map_over_sections (stdoutput
, size_seg
, (char *) 0);
2146 /* Relaxation has completed. Freeze all syms. */
2149 dwarf2dbg_final_check ();
2151 #ifdef md_post_relax_hook
2157 create_obj_attrs_section ();
2160 #ifndef WORKING_DOT_WORD
2162 struct broken_word
*lie
;
2163 struct broken_word
**prevP
;
2165 prevP
= &broken_words
;
2166 for (lie
= broken_words
; lie
; lie
= lie
->next_broken_word
)
2171 subseg_change (lie
->seg
, lie
->subseg
);
2172 exp
.X_op
= O_subtract
;
2173 exp
.X_add_symbol
= lie
->add
;
2174 exp
.X_op_symbol
= lie
->sub
;
2175 exp
.X_add_number
= lie
->addnum
;
2176 #ifdef TC_CONS_FIX_NEW
2177 TC_CONS_FIX_NEW (lie
->frag
,
2178 lie
->word_goes_here
- lie
->frag
->fr_literal
,
2179 2, &exp
, TC_PARSE_CONS_RETURN_NONE
);
2181 fix_new_exp (lie
->frag
,
2182 lie
->word_goes_here
- lie
->frag
->fr_literal
,
2183 2, &exp
, 0, BFD_RELOC_16
);
2185 *prevP
= lie
->next_broken_word
;
2188 prevP
= &(lie
->next_broken_word
);
2190 for (lie
= broken_words
; lie
;)
2192 struct broken_word
*untruth
;
2194 addressT table_addr
;
2195 addressT from_addr
, to_addr
;
2198 subseg_change (lie
->seg
, lie
->subseg
);
2199 fragP
= lie
->dispfrag
;
2201 /* Find out how many broken_words go here. */
2204 untruth
&& untruth
->dispfrag
== fragP
;
2205 untruth
= untruth
->next_broken_word
)
2206 if (untruth
->added
== 1)
2209 table_ptr
= lie
->dispfrag
->fr_opcode
;
2210 table_addr
= (lie
->dispfrag
->fr_address
2211 + (table_ptr
- lie
->dispfrag
->fr_literal
));
2212 /* Create the jump around the long jumps. This is a short
2213 jump from table_ptr+0 to table_ptr+n*long_jump_size. */
2214 from_addr
= table_addr
;
2215 to_addr
= table_addr
+ md_short_jump_size
+ n
* md_long_jump_size
;
2216 md_create_short_jump (table_ptr
, from_addr
, to_addr
, lie
->dispfrag
,
2218 table_ptr
+= md_short_jump_size
;
2219 table_addr
+= md_short_jump_size
;
2222 lie
&& lie
->dispfrag
== fragP
;
2223 m
++, lie
= lie
->next_broken_word
)
2225 if (lie
->added
== 2)
2227 /* Patch the jump table. */
2228 for (untruth
= (struct broken_word
*) (fragP
->fr_symbol
);
2229 untruth
&& untruth
->dispfrag
== fragP
;
2230 untruth
= untruth
->next_broken_word
)
2232 if (untruth
->use_jump
== lie
)
2234 /* This is the offset from ??? to table_ptr+0.
2235 The target is the same for all users of this
2236 md_long_jump, but the "sub" bases (and hence the
2237 offsets) may be different. */
2238 addressT to_word
= table_addr
- S_GET_VALUE (untruth
->sub
);
2239 #ifdef TC_CHECK_ADJUSTED_BROKEN_DOT_WORD
2240 TC_CHECK_ADJUSTED_BROKEN_DOT_WORD (to_word
, untruth
);
2242 md_number_to_chars (untruth
->word_goes_here
, to_word
, 2);
2246 /* Install the long jump. */
2247 /* This is a long jump from table_ptr+0 to the final target. */
2248 from_addr
= table_addr
;
2249 to_addr
= S_GET_VALUE (lie
->add
) + lie
->addnum
;
2250 md_create_long_jump (table_ptr
, from_addr
, to_addr
, lie
->dispfrag
,
2252 table_ptr
+= md_long_jump_size
;
2253 table_addr
+= md_long_jump_size
;
2257 #endif /* not WORKING_DOT_WORD */
2259 /* Resolve symbol values. This needs to be done before processing
2265 for (symp
= symbol_rootP
; symp
; symp
= symbol_next (symp
))
2266 resolve_symbol_value (symp
);
2268 resolve_local_symbol_values ();
2269 resolve_reloc_expr_symbols ();
2273 maybe_generate_build_notes ();
2278 #ifdef tc_frob_file_before_adjust
2279 tc_frob_file_before_adjust ();
2281 #ifdef obj_frob_file_before_adjust
2282 obj_frob_file_before_adjust ();
2285 bfd_map_over_sections (stdoutput
, adjust_reloc_syms
, (char *) 0);
2287 #ifdef tc_frob_file_before_fix
2288 tc_frob_file_before_fix ();
2290 #ifdef obj_frob_file_before_fix
2291 obj_frob_file_before_fix ();
2294 bfd_map_over_sections (stdoutput
, fix_segment
, (char *) 0);
2296 /* Set up symbol table, and write it out. */
2300 bfd_boolean skip_next_symbol
= FALSE
;
2302 for (symp
= symbol_rootP
; symp
; symp
= symbol_next (symp
))
2307 if (skip_next_symbol
)
2309 /* Don't do anything besides moving the value of the
2310 symbol from the GAS value-field to the BFD value-field. */
2311 symbol_get_bfdsym (symp
)->value
= S_GET_VALUE (symp
);
2312 skip_next_symbol
= FALSE
;
2316 if (symbol_mri_common_p (symp
))
2318 if (S_IS_EXTERNAL (symp
))
2319 as_bad (_("%s: global symbols not supported in common sections"),
2321 symbol_remove (symp
, &symbol_rootP
, &symbol_lastP
);
2325 name
= S_GET_NAME (symp
);
2329 decode_local_label_name ((char *) S_GET_NAME (symp
));
2330 /* They only differ if `name' is a fb or dollar local
2332 if (name2
!= name
&& ! S_IS_DEFINED (symp
))
2333 as_bad (_("local label `%s' is not defined"), name2
);
2336 /* Do it again, because adjust_reloc_syms might introduce
2337 more symbols. They'll probably only be section symbols,
2338 but they'll still need to have the values computed. */
2339 resolve_symbol_value (symp
);
2341 /* Skip symbols which were equated to undefined or common
2343 if (symbol_equated_reloc_p (symp
)
2344 || S_IS_WEAKREFR (symp
))
2346 const char *sname
= S_GET_NAME (symp
);
2348 if (S_IS_COMMON (symp
)
2349 && !TC_FAKE_LABEL (sname
)
2350 && !S_IS_WEAKREFR (symp
))
2352 expressionS
*e
= symbol_get_value_expression (symp
);
2354 as_bad (_("`%s' can't be equated to common symbol `%s'"),
2355 sname
, S_GET_NAME (e
->X_add_symbol
));
2357 if (S_GET_SEGMENT (symp
) == reg_section
)
2359 /* Report error only if we know the symbol name. */
2360 if (S_GET_NAME (symp
) != reg_section
->name
)
2361 as_bad (_("can't make global register symbol `%s'"),
2364 symbol_remove (symp
, &symbol_rootP
, &symbol_lastP
);
2368 #ifdef obj_frob_symbol
2369 obj_frob_symbol (symp
, punt
);
2371 #ifdef tc_frob_symbol
2372 if (! punt
|| symbol_used_in_reloc_p (symp
))
2373 tc_frob_symbol (symp
, punt
);
2376 /* If we don't want to keep this symbol, splice it out of
2377 the chain now. If EMIT_SECTION_SYMBOLS is 0, we never
2378 want section symbols. Otherwise, we skip local symbols
2379 and symbols that the frob_symbol macros told us to punt,
2380 but we keep such symbols if they are used in relocs. */
2381 if (symp
== abs_section_sym
2382 || (! EMIT_SECTION_SYMBOLS
2383 && symbol_section_p (symp
))
2384 /* Note that S_IS_EXTERNAL and S_IS_LOCAL are not always
2385 opposites. Sometimes the former checks flags and the
2386 latter examines the name... */
2387 || (!S_IS_EXTERNAL (symp
)
2388 && (punt
|| S_IS_LOCAL (symp
) ||
2389 (S_IS_WEAKREFD (symp
) && ! symbol_used_p (symp
)))
2390 && ! symbol_used_in_reloc_p (symp
)))
2392 symbol_remove (symp
, &symbol_rootP
, &symbol_lastP
);
2394 /* After symbol_remove, symbol_next(symp) still returns
2395 the one that came after it in the chain. So we don't
2396 need to do any extra cleanup work here. */
2400 /* Make sure we really got a value for the symbol. */
2401 if (! symbol_resolved_p (symp
))
2403 as_bad (_("can't resolve value for symbol `%s'"),
2405 symbol_mark_resolved (symp
);
2408 /* Set the value into the BFD symbol. Up til now the value
2409 has only been kept in the gas symbolS struct. */
2410 symbol_get_bfdsym (symp
)->value
= S_GET_VALUE (symp
);
2412 /* A warning construct is a warning symbol followed by the
2413 symbol warned about. Don't let anything object-format or
2414 target-specific muck with it; it's ready for output. */
2415 if (symbol_get_bfdsym (symp
)->flags
& BSF_WARNING
)
2416 skip_next_symbol
= TRUE
;
2422 /* Now do any format-specific adjustments to the symbol table, such
2423 as adding file symbols. */
2424 #ifdef tc_adjust_symtab
2425 tc_adjust_symtab ();
2427 #ifdef obj_adjust_symtab
2428 obj_adjust_symtab ();
2431 /* Stop if there is an error. */
2435 /* Now that all the sizes are known, and contents correct, we can
2436 start writing to the file. */
2439 /* If *_frob_file changes the symbol value at this point, it is
2440 responsible for moving the changed value into symp->bsym->value
2441 as well. Hopefully all symbol value changing can be done in
2446 #ifdef obj_frob_file
2449 #ifdef obj_coff_generate_pdata
2450 obj_coff_generate_pdata ();
2453 bfd_map_over_sections (stdoutput
, write_relocs
, (char *) 0);
2455 #ifdef tc_frob_file_after_relocs
2456 tc_frob_file_after_relocs ();
2458 #ifdef obj_frob_file_after_relocs
2459 obj_frob_file_after_relocs ();
2462 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
2463 if (IS_ELF
&& flag_use_elf_stt_common
)
2464 stdoutput
->flags
|= BFD_CONVERT_ELF_COMMON
| BFD_USE_ELF_STT_COMMON
;
2467 /* Once all relocations have been written, we can compress the
2468 contents of the debug sections. This needs to be done before
2469 we start writing any sections, because it will affect the file
2470 layout, which is fixed once we start writing contents. */
2471 if (flag_compress_debug
)
2473 if (flag_compress_debug
== COMPRESS_DEBUG_GABI_ZLIB
)
2474 stdoutput
->flags
|= BFD_COMPRESS
| BFD_COMPRESS_GABI
;
2476 stdoutput
->flags
|= BFD_COMPRESS
;
2477 bfd_map_over_sections (stdoutput
, compress_debug
, (char *) 0);
2480 bfd_map_over_sections (stdoutput
, write_contents
, (char *) 0);
2483 #ifdef TC_GENERIC_RELAX_TABLE
2484 /* Relax a fragment by scanning TC_GENERIC_RELAX_TABLE. */
2487 relax_frag (segT segment
, fragS
*fragP
, long stretch
)
2489 const relax_typeS
*this_type
;
2490 const relax_typeS
*start_type
;
2491 relax_substateT next_state
;
2492 relax_substateT this_state
;
2498 const relax_typeS
*table
;
2500 target
= fragP
->fr_offset
;
2501 address
= fragP
->fr_address
+ fragP
->fr_fix
;
2502 table
= TC_GENERIC_RELAX_TABLE
;
2503 this_state
= fragP
->fr_subtype
;
2504 start_type
= this_type
= table
+ this_state
;
2505 symbolP
= fragP
->fr_symbol
;
2511 sym_frag
= symbol_get_frag (symbolP
);
2513 #ifndef DIFF_EXPR_OK
2514 know (sym_frag
!= NULL
);
2516 know (S_GET_SEGMENT (symbolP
) != absolute_section
2517 || sym_frag
== &zero_address_frag
);
2518 target
+= S_GET_VALUE (symbolP
);
2520 /* If SYM_FRAG has yet to be reached on this pass, assume it
2521 will move by STRETCH just as we did, unless there is an
2522 alignment frag between here and SYM_FRAG. An alignment may
2523 well absorb any STRETCH, and we don't want to choose a larger
2524 branch insn by overestimating the needed reach of this
2525 branch. It isn't critical to calculate TARGET exactly; We
2526 know we'll be doing another pass if STRETCH is non-zero. */
2529 && sym_frag
->relax_marker
!= fragP
->relax_marker
2530 && S_GET_SEGMENT (symbolP
) == segment
)
2533 || sym_frag
->region
== fragP
->region
)
2535 /* If we get here we know we have a forward branch. This
2536 relax pass may have stretched previous instructions so
2537 far that omitting STRETCH would make the branch
2538 negative. Don't allow this in case the negative reach is
2539 large enough to require a larger branch instruction. */
2540 else if (target
< address
)
2545 aim
= target
- address
;
2546 #ifdef TC_PCREL_ADJUST
2547 /* Currently only the ns32k and arc needs this. */
2548 aim
+= TC_PCREL_ADJUST (fragP
);
2551 #ifdef md_prepare_relax_scan
2552 /* Formerly called M68K_AIM_KLUDGE. */
2553 md_prepare_relax_scan (fragP
, address
, aim
, this_state
, this_type
);
2558 /* Look backwards. */
2559 for (next_state
= this_type
->rlx_more
; next_state
;)
2560 if (aim
>= this_type
->rlx_backward
)
2564 /* Grow to next state. */
2565 this_state
= next_state
;
2566 this_type
= table
+ this_state
;
2567 next_state
= this_type
->rlx_more
;
2572 /* Look forwards. */
2573 for (next_state
= this_type
->rlx_more
; next_state
;)
2574 if (aim
<= this_type
->rlx_forward
)
2578 /* Grow to next state. */
2579 this_state
= next_state
;
2580 this_type
= table
+ this_state
;
2581 next_state
= this_type
->rlx_more
;
2585 growth
= this_type
->rlx_length
- start_type
->rlx_length
;
2587 fragP
->fr_subtype
= this_state
;
2591 #endif /* defined (TC_GENERIC_RELAX_TABLE) */
2593 /* Relax_align. Advance location counter to next address that has 'alignment'
2594 lowest order bits all 0s, return size of adjustment made. */
2595 static relax_addressT
2596 relax_align (relax_addressT address
, /* Address now. */
2597 int alignment
/* Alignment (binary). */)
2599 relax_addressT mask
;
2600 relax_addressT new_address
;
2602 mask
= ~((relax_addressT
) ~0 << alignment
);
2603 new_address
= (address
+ mask
) & (~mask
);
2604 #ifdef LINKER_RELAXING_SHRINKS_ONLY
2606 /* We must provide lots of padding, so the linker can discard it
2607 when needed. The linker will not add extra space, ever. */
2608 new_address
+= (1 << alignment
);
2610 return (new_address
- address
);
2613 /* Now we have a segment, not a crowd of sub-segments, we can make
2618 After this, all frags in this segment have addresses that are correct
2619 within the segment. Since segments live in different file addresses,
2620 these frag addresses may not be the same as final object-file
2624 relax_segment (struct frag
*segment_frag_root
, segT segment
, int pass
)
2626 unsigned long frag_count
;
2628 relax_addressT address
;
2632 /* In case md_estimate_size_before_relax() wants to make fixSs. */
2633 subseg_change (segment
, 0);
2635 /* For each frag in segment: count and store (a 1st guess of)
2639 for (frag_count
= 0, fragP
= segment_frag_root
;
2641 fragP
= fragP
->fr_next
, frag_count
++)
2643 fragP
->region
= region
;
2644 fragP
->relax_marker
= 0;
2645 fragP
->fr_address
= address
;
2646 address
+= fragP
->fr_fix
;
2648 switch (fragP
->fr_type
)
2651 address
+= fragP
->fr_offset
* fragP
->fr_var
;
2658 addressT offset
= relax_align (address
, (int) fragP
->fr_offset
);
2660 if (fragP
->fr_subtype
!= 0 && offset
> fragP
->fr_subtype
)
2663 if (offset
% fragP
->fr_var
!= 0)
2665 as_bad_where (fragP
->fr_file
, fragP
->fr_line
,
2666 ngettext ("alignment padding (%lu byte) "
2667 "not a multiple of %ld",
2668 "alignment padding (%lu bytes) "
2669 "not a multiple of %ld",
2670 (unsigned long) offset
),
2671 (unsigned long) offset
, (long) fragP
->fr_var
);
2672 offset
-= (offset
% fragP
->fr_var
);
2681 /* Assume .org is nugatory. It will grow with 1st relax. */
2689 case rs_machine_dependent
:
2690 /* If fr_symbol is an expression, this call to
2691 resolve_symbol_value sets up the correct segment, which will
2692 likely be needed in md_estimate_size_before_relax. */
2693 if (fragP
->fr_symbol
)
2694 resolve_symbol_value (fragP
->fr_symbol
);
2696 address
+= md_estimate_size_before_relax (fragP
, segment
);
2699 #ifndef WORKING_DOT_WORD
2700 /* Broken words don't concern us yet. */
2701 case rs_broken_word
:
2706 /* Initial guess is always 1; doing otherwise can result in
2707 stable solutions that are larger than the minimum. */
2708 address
+= fragP
->fr_offset
= 1;
2712 address
+= eh_frame_estimate_size_before_relax (fragP
);
2716 address
+= dwarf2dbg_estimate_size_before_relax (fragP
);
2720 BAD_CASE (fragP
->fr_type
);
2727 unsigned long max_iterations
;
2729 /* Cumulative address adjustment. */
2732 /* Have we made any adjustment this pass? We can't just test
2733 stretch because one piece of code may have grown and another
2737 /* Most horrible, but gcc may give us some exception data that
2738 is impossible to assemble, of the form
2742 .uleb128 end - start
2748 If the leb128 is two bytes in size, then end-start is 128*128,
2749 which requires a three byte leb128. If the leb128 is three
2750 bytes in size, then end-start is 128*128-1, which requires a
2751 two byte leb128. We work around this dilemma by inserting
2752 an extra 4 bytes of alignment just after the .align. This
2753 works because the data after the align is accessed relative to
2756 This counter is used in a tiny state machine to detect
2757 whether a leb128 followed by an align is impossible to
2759 int rs_leb128_fudge
= 0;
2761 /* We want to prevent going into an infinite loop where one frag grows
2762 depending upon the location of a symbol which is in turn moved by
2763 the growing frag. eg:
2769 So we dictate that this algorithm can be at most O2. */
2770 max_iterations
= frag_count
* frag_count
;
2771 /* Check for overflow. */
2772 if (max_iterations
< frag_count
)
2773 max_iterations
= frag_count
;
2781 for (fragP
= segment_frag_root
; fragP
; fragP
= fragP
->fr_next
)
2784 addressT was_address
;
2788 fragP
->relax_marker
^= 1;
2789 was_address
= fragP
->fr_address
;
2790 address
= fragP
->fr_address
+= stretch
;
2791 symbolP
= fragP
->fr_symbol
;
2792 offset
= fragP
->fr_offset
;
2794 switch (fragP
->fr_type
)
2796 case rs_fill
: /* .fill never relaxes. */
2800 #ifndef WORKING_DOT_WORD
2801 /* JF: This is RMS's idea. I do *NOT* want to be blamed
2802 for it I do not want to write it. I do not want to have
2803 anything to do with it. This is not the proper way to
2804 implement this misfeature. */
2805 case rs_broken_word
:
2807 struct broken_word
*lie
;
2808 struct broken_word
*untruth
;
2810 /* Yes this is ugly (storing the broken_word pointer
2811 in the symbol slot). Still, this whole chunk of
2812 code is ugly, and I don't feel like doing anything
2813 about it. Think of it as stubbornness in action. */
2815 for (lie
= (struct broken_word
*) (fragP
->fr_symbol
);
2816 lie
&& lie
->dispfrag
== fragP
;
2817 lie
= lie
->next_broken_word
)
2823 offset
= (S_GET_VALUE (lie
->add
)
2825 - S_GET_VALUE (lie
->sub
));
2826 if (offset
<= -32768 || offset
>= 32767)
2828 if (flag_warn_displacement
)
2831 sprint_value (buf
, (addressT
) lie
->addnum
);
2832 as_warn_where (fragP
->fr_file
, fragP
->fr_line
,
2833 _(".word %s-%s+%s didn't fit"),
2834 S_GET_NAME (lie
->add
),
2835 S_GET_NAME (lie
->sub
),
2838 if (fragP
->fr_subtype
== 0)
2840 fragP
->fr_subtype
++;
2841 growth
+= md_short_jump_size
;
2844 /* Redirect *all* words of this table with the same
2845 target, lest we have to handle the case where the
2846 same target but with a offset that fits on this
2847 round overflows at the next relaxation round. */
2848 for (untruth
= (struct broken_word
*) (fragP
->fr_symbol
);
2849 untruth
&& untruth
->dispfrag
== lie
->dispfrag
;
2850 untruth
= untruth
->next_broken_word
)
2851 if ((symbol_get_frag (untruth
->add
)
2852 == symbol_get_frag (lie
->add
))
2853 && (S_GET_VALUE (untruth
->add
)
2854 == S_GET_VALUE (lie
->add
)))
2857 untruth
->use_jump
= lie
;
2861 growth
+= md_long_jump_size
;
2866 } /* case rs_broken_word */
2872 addressT oldoff
, newoff
;
2874 oldoff
= relax_align (was_address
+ fragP
->fr_fix
,
2876 newoff
= relax_align (address
+ fragP
->fr_fix
,
2879 if (fragP
->fr_subtype
!= 0)
2881 if (oldoff
> fragP
->fr_subtype
)
2883 if (newoff
> fragP
->fr_subtype
)
2887 growth
= newoff
- oldoff
;
2889 /* If this align happens to follow a leb128 and
2890 we have determined that the leb128 is bouncing
2891 in size, then break the cycle by inserting an
2894 && (rs_leb128_fudge
& 16) != 0
2895 && (rs_leb128_fudge
& 15) >= 2)
2897 segment_info_type
*seginfo
= seg_info (segment
);
2898 struct obstack
*ob
= &seginfo
->frchainP
->frch_obstack
;
2901 newf
= frag_alloc (ob
);
2902 obstack_blank_fast (ob
, fragP
->fr_var
);
2903 obstack_finish (ob
);
2904 memcpy (newf
, fragP
, SIZEOF_STRUCT_FRAG
);
2905 memcpy (newf
->fr_literal
,
2906 fragP
->fr_literal
+ fragP
->fr_fix
,
2908 newf
->fr_type
= rs_fill
;
2909 newf
->fr_address
= address
+ fragP
->fr_fix
+ newoff
;
2911 newf
->fr_offset
= (((offsetT
) 1 << fragP
->fr_offset
)
2913 if (newf
->fr_offset
* newf
->fr_var
2914 != (offsetT
) 1 << fragP
->fr_offset
)
2916 newf
->fr_offset
= (offsetT
) 1 << fragP
->fr_offset
;
2919 /* Include size of new frag in GROWTH. */
2920 growth
+= newf
->fr_offset
* newf
->fr_var
;
2921 /* Adjust the new frag address for the amount
2922 we'll add when we process the new frag. */
2923 newf
->fr_address
-= stretch
+ growth
;
2924 newf
->relax_marker
^= 1;
2925 fragP
->fr_next
= newf
;
2927 as_warn (_("padding added"));
2935 addressT target
= offset
;
2940 /* Convert from an actual address to an octet offset
2941 into the section. Here it is assumed that the
2942 section's VMA is zero, and can omit subtracting it
2943 from the symbol's value to get the address offset. */
2944 know (S_GET_SEGMENT (symbolP
)->vma
== 0);
2945 target
+= S_GET_VALUE (symbolP
) * OCTETS_PER_BYTE
;
2948 know (fragP
->fr_next
);
2949 after
= fragP
->fr_next
->fr_address
+ stretch
;
2950 growth
= target
- after
;
2952 /* Growth may be negative, but variable part of frag
2953 cannot have fewer than 0 chars. That is, we can't
2955 if (address
+ fragP
->fr_fix
> target
)
2959 /* Don't error on first few frag relax passes.
2960 The symbol might be an expression involving
2961 symbol values from other sections. If those
2962 sections have not yet been processed their
2963 frags will all have zero addresses, so we
2964 will calculate incorrect values for them. The
2965 number of passes we allow before giving an
2966 error is somewhat arbitrary. It should be at
2967 least one, with larger values requiring
2968 increasingly contrived dependencies between
2969 frags to trigger a false error. */
2972 /* Force another pass. */
2977 as_bad_where (fragP
->fr_file
, fragP
->fr_line
,
2978 _("attempt to move .org backwards"));
2980 /* We've issued an error message. Change the
2981 frag to avoid cascading errors. */
2982 fragP
->fr_type
= rs_align
;
2983 fragP
->fr_subtype
= 0;
2984 fragP
->fr_offset
= 0;
2985 fragP
->fr_fix
= after
- address
;
2997 amount
= S_GET_VALUE (symbolP
);
2998 if (S_GET_SEGMENT (symbolP
) != absolute_section
2999 || S_IS_COMMON (symbolP
)
3000 || ! S_IS_DEFINED (symbolP
))
3002 as_bad_where (fragP
->fr_file
, fragP
->fr_line
,
3003 _(".space specifies non-absolute value"));
3004 /* Prevent repeat of this error message. */
3005 fragP
->fr_symbol
= 0;
3007 else if (amount
< 0)
3009 /* Don't error on first few frag relax passes.
3010 See rs_org comment for a longer explanation. */
3017 as_warn_where (fragP
->fr_file
, fragP
->fr_line
,
3018 _(".space, .nops or .fill with negative value, ignored"));
3019 fragP
->fr_symbol
= 0;
3022 growth
= (was_address
+ fragP
->fr_fix
+ amount
3023 - fragP
->fr_next
->fr_address
);
3027 case rs_machine_dependent
:
3028 #ifdef md_relax_frag
3029 growth
= md_relax_frag (segment
, fragP
, stretch
);
3031 #ifdef TC_GENERIC_RELAX_TABLE
3032 /* The default way to relax a frag is to look through
3033 TC_GENERIC_RELAX_TABLE. */
3034 growth
= relax_frag (segment
, fragP
, stretch
);
3035 #endif /* TC_GENERIC_RELAX_TABLE */
3044 value
= resolve_symbol_value (fragP
->fr_symbol
);
3045 size
= sizeof_leb128 (value
, fragP
->fr_subtype
);
3046 growth
= size
- fragP
->fr_offset
;
3047 fragP
->fr_offset
= size
;
3052 growth
= eh_frame_relax_frag (fragP
);
3056 growth
= dwarf2dbg_relax_frag (fragP
);
3060 BAD_CASE (fragP
->fr_type
);
3067 if (fragP
->fr_type
== rs_leb128
)
3068 rs_leb128_fudge
+= 16;
3069 else if (fragP
->fr_type
== rs_align
3070 && (rs_leb128_fudge
& 16) != 0
3072 rs_leb128_fudge
+= 16;
3074 rs_leb128_fudge
= 0;
3079 && (rs_leb128_fudge
& 16) == 0
3080 && (rs_leb128_fudge
& -16) != 0)
3081 rs_leb128_fudge
+= 1;
3083 rs_leb128_fudge
= 0;
3085 /* Until nothing further to relax. */
3086 while (stretched
&& -- max_iterations
);
3089 as_fatal (_("Infinite loop encountered whilst attempting to compute the addresses of symbols in section %s"),
3090 segment_name (segment
));
3093 for (fragP
= segment_frag_root
; fragP
; fragP
= fragP
->fr_next
)
3094 if (fragP
->last_fr_address
!= fragP
->fr_address
)
3096 fragP
->last_fr_address
= fragP
->fr_address
;
3103 number_to_chars_bigendian (char *buf
, valueT val
, int n
)
3109 buf
[n
] = val
& 0xff;
3115 number_to_chars_littleendian (char *buf
, valueT val
, int n
)
3121 *buf
++ = val
& 0xff;
3127 write_print_statistics (FILE *file
)
3129 fprintf (file
, "fixups: %d\n", n_fixups
);
3132 /* For debugging. */
3133 extern int indent_level
;
3136 print_fixup (fixS
*fixp
)
3139 fprintf (stderr
, "fix ");
3140 fprintf_vma (stderr
, (bfd_vma
)((bfd_hostptr_t
) fixp
));
3141 fprintf (stderr
, " %s:%d",fixp
->fx_file
, fixp
->fx_line
);
3143 fprintf (stderr
, " pcrel");
3144 if (fixp
->fx_pcrel_adjust
)
3145 fprintf (stderr
, " pcrel_adjust=%d", fixp
->fx_pcrel_adjust
);
3147 fprintf (stderr
, " tcbit");
3149 fprintf (stderr
, " done");
3150 fprintf (stderr
, "\n size=%d frag=", fixp
->fx_size
);
3151 fprintf_vma (stderr
, (bfd_vma
) ((bfd_hostptr_t
) fixp
->fx_frag
));
3152 fprintf (stderr
, " where=%ld offset=%lx addnumber=%lx",
3153 (long) fixp
->fx_where
,
3154 (unsigned long) fixp
->fx_offset
,
3155 (unsigned long) fixp
->fx_addnumber
);
3156 fprintf (stderr
, "\n %s (%d)", bfd_get_reloc_code_name (fixp
->fx_r_type
),
3160 fprintf (stderr
, "\n +<");
3161 print_symbol_value_1 (stderr
, fixp
->fx_addsy
);
3162 fprintf (stderr
, ">");
3166 fprintf (stderr
, "\n -<");
3167 print_symbol_value_1 (stderr
, fixp
->fx_subsy
);
3168 fprintf (stderr
, ">");
3170 fprintf (stderr
, "\n");
3171 #ifdef TC_FIX_DATA_PRINT
3172 TC_FIX_DATA_PRINT (stderr
, fixp
);