1 /* write.c - emit .o file
2 Copyright (C) 1986-2017 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 int where
, /* Where in that frag? */
147 int 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 %d"), 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_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 fixP
->fx_file
= as_where (&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 (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
!= &dummy
409 && prev_frag
->fr_type
!= 0);
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 if (!S_IS_DEFINED (fragP
->fr_symbol
))
470 as_bad_where (fragP
->fr_file
, fragP
->fr_line
,
471 _("leb128 operand is an undefined symbol: %s"),
472 S_GET_NAME (fragP
->fr_symbol
));
475 size
= output_leb128 (fragP
->fr_literal
+ fragP
->fr_fix
, value
,
478 fragP
->fr_fix
+= size
;
479 fragP
->fr_type
= rs_fill
;
481 fragP
->fr_offset
= 0;
482 fragP
->fr_symbol
= NULL
;
487 eh_frame_convert_frag (fragP
);
491 dwarf2dbg_convert_frag (fragP
);
494 case rs_machine_dependent
:
495 md_convert_frag (stdoutput
, sec
, fragP
);
497 gas_assert (fragP
->fr_next
== NULL
498 || ((offsetT
) (fragP
->fr_next
->fr_address
- fragP
->fr_address
)
501 /* After md_convert_frag, we make the frag into a ".space 0".
502 md_convert_frag() should set up any fixSs and constants
507 #ifndef WORKING_DOT_WORD
510 struct broken_word
*lie
;
512 if (fragP
->fr_subtype
)
514 fragP
->fr_fix
+= md_short_jump_size
;
515 for (lie
= (struct broken_word
*) (fragP
->fr_symbol
);
516 lie
&& lie
->dispfrag
== fragP
;
517 lie
= lie
->next_broken_word
)
519 fragP
->fr_fix
+= md_long_jump_size
;
527 BAD_CASE (fragP
->fr_type
);
531 md_frag_check (fragP
);
535 struct relax_seg_info
542 relax_seg (bfd
*abfd ATTRIBUTE_UNUSED
, asection
*sec
, void *xxx
)
544 segment_info_type
*seginfo
= seg_info (sec
);
545 struct relax_seg_info
*info
= (struct relax_seg_info
*) xxx
;
547 if (seginfo
&& seginfo
->frchainP
548 && relax_segment (seginfo
->frchainP
->frch_root
, sec
, info
->pass
))
553 size_seg (bfd
*abfd
, asection
*sec
, void *xxx ATTRIBUTE_UNUSED
)
557 segment_info_type
*seginfo
;
559 valueT size
, newsize
;
561 subseg_change (sec
, 0);
563 seginfo
= seg_info (sec
);
564 if (seginfo
&& seginfo
->frchainP
)
566 for (fragp
= seginfo
->frchainP
->frch_root
; fragp
; fragp
= fragp
->fr_next
)
567 cvt_frag_to_fill (sec
, fragp
);
568 for (fragp
= seginfo
->frchainP
->frch_root
;
570 fragp
= fragp
->fr_next
)
571 /* Walk to last elt. */
573 size
= fragp
->fr_address
+ fragp
->fr_fix
;
578 flags
= bfd_get_section_flags (abfd
, sec
);
579 if (size
== 0 && bfd_get_section_size (sec
) != 0 &&
580 (flags
& SEC_HAS_CONTENTS
) != 0)
583 if (size
> 0 && ! seginfo
->bss
)
584 flags
|= SEC_HAS_CONTENTS
;
587 x
= bfd_set_section_flags (abfd
, sec
, flags
);
590 /* If permitted, allow the backend to pad out the section
591 to some alignment boundary. */
592 if (do_not_pad_sections_to_alignment
)
595 newsize
= md_section_align (sec
, size
);
596 x
= bfd_set_section_size (abfd
, sec
, newsize
);
599 /* If the size had to be rounded up, add some padding in the last
601 gas_assert (newsize
>= size
);
604 fragS
*last
= seginfo
->frchainP
->frch_last
;
605 fragp
= seginfo
->frchainP
->frch_root
;
606 while (fragp
->fr_next
!= last
)
607 fragp
= fragp
->fr_next
;
608 last
->fr_address
= size
;
609 if ((newsize
- size
) % fragp
->fr_var
== 0)
610 fragp
->fr_offset
+= (newsize
- size
) / fragp
->fr_var
;
612 /* If we hit this abort, it's likely due to subsegs_finish not
613 providing sufficient alignment on the last frag, and the
614 machine dependent code using alignment frags with fr_var
619 #ifdef tc_frob_section
620 tc_frob_section (sec
);
622 #ifdef obj_frob_section
623 obj_frob_section (sec
);
629 dump_section_relocs (bfd
*abfd ATTRIBUTE_UNUSED
, asection
*sec
, FILE *stream
)
631 segment_info_type
*seginfo
= seg_info (sec
);
632 fixS
*fixp
= seginfo
->fix_root
;
637 fprintf (stream
, "sec %s relocs:\n", sec
->name
);
640 symbolS
*s
= fixp
->fx_addsy
;
642 fprintf (stream
, " %08lx: type %d ", (unsigned long) fixp
,
643 (int) fixp
->fx_r_type
);
645 fprintf (stream
, "no sym\n");
648 print_symbol_value_1 (stream
, s
);
649 fprintf (stream
, "\n");
651 fixp
= fixp
->fx_next
;
655 #define dump_section_relocs(ABFD,SEC,STREAM) ((void) 0)
658 #ifndef EMIT_SECTION_SYMBOLS
659 #define EMIT_SECTION_SYMBOLS 1
662 /* Resolve U.A.OFFSET_SYM and U.A.SYM fields of RELOC_LIST entries,
663 and check for validity. Convert RELOC_LIST from using U.A fields
666 resolve_reloc_expr_symbols (void)
668 bfd_vma addr_mask
= 1;
669 struct reloc_list
*r
;
671 /* Avoid a shift by the width of type. */
672 addr_mask
<<= bfd_arch_bits_per_address (stdoutput
) - 1;
676 for (r
= reloc_list
; r
; r
= r
->next
)
678 reloc_howto_type
*howto
= r
->u
.a
.howto
;
681 bfd_vma offset
, addend
;
684 resolve_symbol_value (r
->u
.a
.offset_sym
);
685 symval
= symbol_get_value_expression (r
->u
.a
.offset_sym
);
689 if (symval
->X_op
== O_constant
)
690 sym
= r
->u
.a
.offset_sym
;
691 else if (symval
->X_op
== O_symbol
)
693 sym
= symval
->X_add_symbol
;
694 offset
= symval
->X_add_number
;
695 symval
= symbol_get_value_expression (symval
->X_add_symbol
);
698 || symval
->X_op
!= O_constant
699 || (sec
= S_GET_SEGMENT (sym
)) == NULL
700 || !SEG_NORMAL (sec
))
702 as_bad_where (r
->file
, r
->line
, _("invalid offset expression"));
706 offset
+= S_GET_VALUE (sym
);
709 addend
= r
->u
.a
.addend
;
710 if (r
->u
.a
.sym
!= NULL
)
712 resolve_symbol_value (r
->u
.a
.sym
);
713 symval
= symbol_get_value_expression (r
->u
.a
.sym
);
714 if (symval
->X_op
== O_constant
)
716 else if (symval
->X_op
== O_symbol
)
718 sym
= symval
->X_add_symbol
;
719 addend
+= symval
->X_add_number
;
720 symval
= symbol_get_value_expression (symval
->X_add_symbol
);
722 if (symval
->X_op
!= O_constant
)
724 as_bad_where (r
->file
, r
->line
, _("invalid reloc expression"));
727 else if (sym
!= NULL
)
729 /* Convert relocs against local symbols to refer to the
730 corresponding section symbol plus offset instead. Keep
731 PC-relative relocs of the REL variety intact though to
732 prevent the offset from overflowing the relocated field,
733 unless it has enough bits to cover the whole address
735 if (S_IS_LOCAL (sym
) && !symbol_section_p (sym
)
737 || (howto
->partial_inplace
738 && (!howto
->pc_relative
739 || howto
->src_mask
== addr_mask
))))
741 asection
*symsec
= S_GET_SEGMENT (sym
);
742 if (!(((symsec
->flags
& SEC_MERGE
) != 0
744 || (symsec
->flags
& SEC_THREAD_LOCAL
) != 0))
746 addend
+= S_GET_VALUE (sym
);
747 sym
= section_symbol (symsec
);
750 symbol_mark_used_in_reloc (sym
);
755 if (abs_section_sym
== NULL
)
756 abs_section_sym
= section_symbol (absolute_section
);
757 sym
= abs_section_sym
;
761 r
->u
.b
.s
= symbol_get_bfdsym (sym
);
762 r
->u
.b
.r
.sym_ptr_ptr
= &r
->u
.b
.s
;
763 r
->u
.b
.r
.address
= offset
;
764 r
->u
.b
.r
.addend
= addend
;
765 r
->u
.b
.r
.howto
= howto
;
769 /* This pass over fixups decides whether symbols can be replaced with
773 adjust_reloc_syms (bfd
*abfd ATTRIBUTE_UNUSED
,
775 void *xxx ATTRIBUTE_UNUSED
)
777 segment_info_type
*seginfo
= seg_info (sec
);
783 dump_section_relocs (abfd
, sec
, stderr
);
785 for (fixp
= seginfo
->fix_root
; fixp
; fixp
= fixp
->fx_next
)
789 else if (fixp
->fx_addsy
)
795 fprintf (stderr
, "\n\nadjusting fixup:\n");
799 sym
= fixp
->fx_addsy
;
801 /* All symbols should have already been resolved at this
802 point. It is possible to see unresolved expression
803 symbols, though, since they are not in the regular symbol
805 resolve_symbol_value (sym
);
807 if (fixp
->fx_subsy
!= NULL
)
808 resolve_symbol_value (fixp
->fx_subsy
);
810 /* If this symbol is equated to an undefined or common symbol,
811 convert the fixup to being against that symbol. */
812 while (symbol_equated_reloc_p (sym
)
813 || S_IS_WEAKREFR (sym
))
815 symbolS
*newsym
= symbol_get_value_expression (sym
)->X_add_symbol
;
818 fixp
->fx_offset
+= symbol_get_value_expression (sym
)->X_add_number
;
819 fixp
->fx_addsy
= newsym
;
823 if (symbol_mri_common_p (sym
))
825 fixp
->fx_offset
+= S_GET_VALUE (sym
);
826 fixp
->fx_addsy
= symbol_get_value_expression (sym
)->X_add_symbol
;
830 /* If the symbol is undefined, common, weak, or global (ELF
831 shared libs), we can't replace it with the section symbol. */
832 if (S_FORCE_RELOC (fixp
->fx_addsy
, 1))
835 /* Is there some other (target cpu dependent) reason we can't adjust
836 this one? (E.g. relocations involving function addresses on
838 #ifdef tc_fix_adjustable
839 if (! tc_fix_adjustable (fixp
))
843 /* Since we're reducing to section symbols, don't attempt to reduce
844 anything that's already using one. */
845 if (symbol_section_p (sym
))
848 symsec
= S_GET_SEGMENT (sym
);
852 if (bfd_is_abs_section (symsec
)
853 || symsec
== reg_section
)
855 /* The fixup_segment routine normally will not use this
856 symbol in a relocation. */
860 /* Don't try to reduce relocs which refer to non-local symbols
861 in .linkonce sections. It can lead to confusion when a
862 debugging section refers to a .linkonce section. I hope
863 this will always be correct. */
864 if (symsec
!= sec
&& ! S_IS_LOCAL (sym
))
866 if ((symsec
->flags
& SEC_LINK_ONCE
) != 0
868 /* The GNU toolchain uses an extension for ELF: a
869 section beginning with the magic string
870 .gnu.linkonce is a linkonce section. */
871 && strncmp (segment_name (symsec
), ".gnu.linkonce",
872 sizeof ".gnu.linkonce" - 1) == 0))
876 /* Never adjust a reloc against local symbol in a merge section
877 with non-zero addend. */
878 if ((symsec
->flags
& SEC_MERGE
) != 0
879 && (fixp
->fx_offset
!= 0 || fixp
->fx_subsy
!= NULL
))
882 /* Never adjust a reloc against TLS local symbol. */
883 if ((symsec
->flags
& SEC_THREAD_LOCAL
) != 0)
886 /* We refetch the segment when calling section_symbol, rather
887 than using symsec, because S_GET_VALUE may wind up changing
888 the section when it calls resolve_symbol_value. */
889 fixp
->fx_offset
+= S_GET_VALUE (sym
);
890 fixp
->fx_addsy
= section_symbol (S_GET_SEGMENT (sym
));
892 fprintf (stderr
, "\nadjusted fixup:\n");
897 dump_section_relocs (abfd
, sec
, stderr
);
902 Go through all the fixS's in a segment and see which ones can be
903 handled now. (These consist of fixS where we have since discovered
904 the value of a symbol, or the address of the frag involved.)
905 For each one, call md_apply_fix to put the fix into the frag data.
906 Ones that we couldn't completely handle here will be output later
907 by emit_relocations. */
910 fixup_segment (fixS
*fixP
, segT this_segment
)
914 segT add_symbol_segment
= absolute_section
;
916 if (fixP
!= NULL
&& abs_section_sym
== NULL
)
917 abs_section_sym
= section_symbol (absolute_section
);
919 /* If the linker is doing the relaxing, we must not do any fixups.
921 Well, strictly speaking that's not true -- we could do any that
922 are PC-relative and don't cross regions that could change size.
923 And for the i960 we might be able to turn callx/callj into bal
924 anyways in cases where we know the maximum displacement. */
925 if (linkrelax
&& TC_LINKRELAX_FIXUP (this_segment
))
927 for (; fixP
; fixP
= fixP
->fx_next
)
930 if (fixP
->fx_addsy
== NULL
)
932 /* There was no symbol required by this relocation.
933 However, BFD doesn't really handle relocations
934 without symbols well. So fake up a local symbol in
935 the absolute section. */
936 fixP
->fx_addsy
= abs_section_sym
;
938 symbol_mark_used_in_reloc (fixP
->fx_addsy
);
939 if (fixP
->fx_subsy
!= NULL
)
940 symbol_mark_used_in_reloc (fixP
->fx_subsy
);
945 for (; fixP
; fixP
= fixP
->fx_next
)
948 fprintf (stderr
, "\nprocessing fixup:\n");
952 fragP
= fixP
->fx_frag
;
954 #ifdef TC_VALIDATE_FIX
955 TC_VALIDATE_FIX (fixP
, this_segment
, skip
);
957 add_number
= fixP
->fx_offset
;
959 if (fixP
->fx_addsy
!= NULL
)
960 add_symbol_segment
= S_GET_SEGMENT (fixP
->fx_addsy
);
962 if (fixP
->fx_subsy
!= NULL
)
964 segT sub_symbol_segment
;
965 resolve_symbol_value (fixP
->fx_subsy
);
966 sub_symbol_segment
= S_GET_SEGMENT (fixP
->fx_subsy
);
967 if (fixP
->fx_addsy
!= NULL
968 && sub_symbol_segment
== add_symbol_segment
969 && !S_FORCE_RELOC (fixP
->fx_addsy
, 0)
970 && !S_FORCE_RELOC (fixP
->fx_subsy
, 0)
971 && !TC_FORCE_RELOCATION_SUB_SAME (fixP
, add_symbol_segment
))
973 add_number
+= S_GET_VALUE (fixP
->fx_addsy
);
974 add_number
-= S_GET_VALUE (fixP
->fx_subsy
);
975 fixP
->fx_offset
= add_number
;
976 fixP
->fx_addsy
= NULL
;
977 fixP
->fx_subsy
= NULL
;
979 /* See the comment below about 68k weirdness. */
983 else if (sub_symbol_segment
== absolute_section
984 && !S_FORCE_RELOC (fixP
->fx_subsy
, 0)
985 && !TC_FORCE_RELOCATION_SUB_ABS (fixP
, add_symbol_segment
))
987 add_number
-= S_GET_VALUE (fixP
->fx_subsy
);
988 fixP
->fx_offset
= add_number
;
989 fixP
->fx_subsy
= NULL
;
991 else if (sub_symbol_segment
== this_segment
992 && !S_FORCE_RELOC (fixP
->fx_subsy
, 0)
993 && !TC_FORCE_RELOCATION_SUB_LOCAL (fixP
, add_symbol_segment
))
995 add_number
-= S_GET_VALUE (fixP
->fx_subsy
);
996 fixP
->fx_offset
= (add_number
+ fixP
->fx_dot_value
997 + fixP
->fx_dot_frag
->fr_address
);
999 /* Make it pc-relative. If the back-end code has not
1000 selected a pc-relative reloc, cancel the adjustment
1001 we do later on all pc-relative relocs. */
1004 /* Do this for m68k even if it's already described
1005 as pc-relative. On the m68k, an operand of
1006 "pc@(foo-.-2)" should address "foo" in a
1007 pc-relative mode. */
1011 add_number
+= MD_PCREL_FROM_SECTION (fixP
, this_segment
);
1012 fixP
->fx_subsy
= NULL
;
1015 else if (!TC_VALIDATE_FIX_SUB (fixP
, add_symbol_segment
))
1017 if (!md_register_arithmetic
1018 && (add_symbol_segment
== reg_section
1019 || sub_symbol_segment
== reg_section
))
1020 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1021 _("register value used as expression"));
1023 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1024 _("can't resolve `%s' {%s section} - `%s' {%s section}"),
1025 fixP
->fx_addsy
? S_GET_NAME (fixP
->fx_addsy
) : "0",
1026 segment_name (add_symbol_segment
),
1027 S_GET_NAME (fixP
->fx_subsy
),
1028 segment_name (sub_symbol_segment
));
1030 else if (sub_symbol_segment
!= undefined_section
1031 && ! bfd_is_com_section (sub_symbol_segment
)
1032 && MD_APPLY_SYM_VALUE (fixP
))
1033 add_number
-= S_GET_VALUE (fixP
->fx_subsy
);
1038 if (add_symbol_segment
== this_segment
1039 && !S_FORCE_RELOC (fixP
->fx_addsy
, 0)
1040 && !TC_FORCE_RELOCATION_LOCAL (fixP
))
1042 /* This fixup was made when the symbol's segment was
1043 SEG_UNKNOWN, but it is now in the local segment.
1044 So we know how to do the address without relocation. */
1045 add_number
+= S_GET_VALUE (fixP
->fx_addsy
);
1046 fixP
->fx_offset
= add_number
;
1048 add_number
-= MD_PCREL_FROM_SECTION (fixP
, this_segment
);
1049 fixP
->fx_addsy
= NULL
;
1052 else if (add_symbol_segment
== absolute_section
1053 && !S_FORCE_RELOC (fixP
->fx_addsy
, 0)
1054 && !TC_FORCE_RELOCATION_ABS (fixP
))
1056 add_number
+= S_GET_VALUE (fixP
->fx_addsy
);
1057 fixP
->fx_offset
= add_number
;
1058 fixP
->fx_addsy
= NULL
;
1060 else if (add_symbol_segment
!= undefined_section
1061 && ! bfd_is_com_section (add_symbol_segment
)
1062 && MD_APPLY_SYM_VALUE (fixP
))
1063 add_number
+= S_GET_VALUE (fixP
->fx_addsy
);
1068 add_number
-= MD_PCREL_FROM_SECTION (fixP
, this_segment
);
1069 if (!fixP
->fx_done
&& fixP
->fx_addsy
== NULL
)
1071 /* There was no symbol required by this relocation.
1072 However, BFD doesn't really handle relocations
1073 without symbols well. So fake up a local symbol in
1074 the absolute section. */
1075 fixP
->fx_addsy
= abs_section_sym
;
1080 md_apply_fix (fixP
, &add_number
, this_segment
);
1084 if (fixP
->fx_addsy
== NULL
)
1085 fixP
->fx_addsy
= abs_section_sym
;
1086 symbol_mark_used_in_reloc (fixP
->fx_addsy
);
1087 if (fixP
->fx_subsy
!= NULL
)
1088 symbol_mark_used_in_reloc (fixP
->fx_subsy
);
1091 if (!fixP
->fx_bit_fixP
&& !fixP
->fx_no_overflow
&& fixP
->fx_size
!= 0)
1093 if (fixP
->fx_size
< sizeof (valueT
))
1098 mask
--; /* Set all bits to one. */
1099 mask
<<= fixP
->fx_size
* 8 - (fixP
->fx_signed
? 1 : 0);
1100 if ((add_number
& mask
) != 0 && (add_number
& mask
) != mask
)
1102 char buf
[50], buf2
[50];
1103 sprint_value (buf
, fragP
->fr_address
+ fixP
->fx_where
);
1104 if (add_number
> 1000)
1105 sprint_value (buf2
, add_number
);
1107 sprintf (buf2
, "%ld", (long) add_number
);
1108 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1109 _("value of %s too large for field of %d bytes at %s"),
1110 buf2
, fixP
->fx_size
, buf
);
1111 } /* Generic error checking. */
1113 #ifdef WARN_SIGNED_OVERFLOW_WORD
1114 /* Warn if a .word value is too large when treated as a signed
1115 number. We already know it is not too negative. This is to
1116 catch over-large switches generated by gcc on the 68k. */
1117 if (!flag_signed_overflow_ok
1118 && fixP
->fx_size
== 2
1119 && add_number
> 0x7fff)
1120 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1121 _("signed .word overflow; switch may be too large; %ld at 0x%lx"),
1123 (long) (fragP
->fr_address
+ fixP
->fx_where
));
1125 } /* Not a bit fix. */
1127 #ifdef TC_VALIDATE_FIX
1128 skip
: ATTRIBUTE_UNUSED_LABEL
1132 fprintf (stderr
, "result:\n");
1135 } /* For each fixS in this segment. */
1139 fix_segment (bfd
*abfd ATTRIBUTE_UNUSED
,
1141 void *xxx ATTRIBUTE_UNUSED
)
1143 segment_info_type
*seginfo
= seg_info (sec
);
1145 fixup_segment (seginfo
->fix_root
, sec
);
1149 install_reloc (asection
*sec
, arelent
*reloc
, fragS
*fragp
,
1150 const char *file
, unsigned int line
)
1153 bfd_reloc_status_type s
;
1156 if (reloc
->sym_ptr_ptr
!= NULL
1157 && (sym
= *reloc
->sym_ptr_ptr
) != NULL
1158 && (sym
->flags
& BSF_KEEP
) == 0
1159 && ((sym
->flags
& BSF_SECTION_SYM
) == 0
1160 || (EMIT_SECTION_SYMBOLS
1161 && !bfd_is_abs_section (sym
->section
))))
1162 as_bad_where (file
, line
, _("redefined symbol cannot be used on reloc"));
1164 s
= bfd_install_relocation (stdoutput
, reloc
,
1165 fragp
->fr_literal
, fragp
->fr_address
,
1171 case bfd_reloc_overflow
:
1172 as_bad_where (file
, line
, _("relocation overflow"));
1174 case bfd_reloc_outofrange
:
1175 as_bad_where (file
, line
, _("relocation out of range"));
1178 as_fatal (_("%s:%u: bad return from bfd_install_relocation: %x"),
1184 get_frag_for_reloc (fragS
*last_frag
,
1185 const segment_info_type
*seginfo
,
1186 const struct reloc_list
*r
)
1190 for (f
= last_frag
; f
!= NULL
; f
= f
->fr_next
)
1191 if (f
->fr_address
<= r
->u
.b
.r
.address
1192 && r
->u
.b
.r
.address
< f
->fr_address
+ f
->fr_fix
)
1195 for (f
= seginfo
->frchainP
->frch_root
; f
!= NULL
; f
= f
->fr_next
)
1196 if (f
->fr_address
<= r
->u
.b
.r
.address
1197 && r
->u
.b
.r
.address
< f
->fr_address
+ f
->fr_fix
)
1200 for (f
= seginfo
->frchainP
->frch_root
; f
!= NULL
; f
= f
->fr_next
)
1201 if (f
->fr_address
<= r
->u
.b
.r
.address
1202 && r
->u
.b
.r
.address
<= f
->fr_address
+ f
->fr_fix
)
1205 as_bad_where (r
->file
, r
->line
,
1206 _("reloc not within (fixed part of) section"));
1211 write_relocs (bfd
*abfd
, asection
*sec
, void *xxx ATTRIBUTE_UNUSED
)
1213 segment_info_type
*seginfo
= seg_info (sec
);
1215 struct reloc_list
*my_reloc_list
, **rp
, *r
;
1220 /* If seginfo is NULL, we did not create this section; don't do
1221 anything with it. */
1222 if (seginfo
== NULL
)
1226 for (fixp
= seginfo
->fix_root
; fixp
; fixp
= fixp
->fx_next
)
1230 #ifdef RELOC_EXPANSION_POSSIBLE
1231 n
*= MAX_RELOC_EXPANSION
;
1234 /* Extract relocs for this section from reloc_list. */
1236 my_reloc_list
= NULL
;
1237 while ((r
= *rp
) != NULL
)
1239 if (r
->u
.b
.sec
== sec
)
1242 r
->next
= my_reloc_list
;
1250 relocs
= XCNEWVEC (arelent
*, n
);
1255 for (fixp
= seginfo
->fix_root
; fixp
!= (fixS
*) NULL
; fixp
= fixp
->fx_next
)
1260 #ifndef RELOC_EXPANSION_POSSIBLE
1269 fx_size
= fixp
->fx_size
;
1270 slack
= TC_FX_SIZE_SLACK (fixp
);
1272 fx_size
= fx_size
> slack
? fx_size
- slack
: 0;
1273 loc
= fixp
->fx_where
+ fx_size
;
1274 if (slack
>= 0 && loc
> fixp
->fx_frag
->fr_fix
)
1275 as_bad_where (fixp
->fx_file
, fixp
->fx_line
,
1276 _("internal error: fixup not contained within frag"));
1278 #ifndef RELOC_EXPANSION_POSSIBLE
1279 *reloc
= tc_gen_reloc (sec
, fixp
);
1281 reloc
= tc_gen_reloc (sec
, fixp
);
1286 while (r
!= NULL
&& r
->u
.b
.r
.address
< (*reloc
)->address
)
1288 fragS
*f
= get_frag_for_reloc (last_frag
, seginfo
, r
);
1292 relocs
[n
++] = &r
->u
.b
.r
;
1293 install_reloc (sec
, &r
->u
.b
.r
, f
, r
->file
, r
->line
);
1297 relocs
[n
++] = *reloc
;
1298 install_reloc (sec
, *reloc
, fixp
->fx_frag
,
1299 fixp
->fx_file
, fixp
->fx_line
);
1300 #ifndef RELOC_EXPANSION_POSSIBLE
1310 fragS
*f
= get_frag_for_reloc (last_frag
, seginfo
, r
);
1314 relocs
[n
++] = &r
->u
.b
.r
;
1315 install_reloc (sec
, &r
->u
.b
.r
, f
, r
->file
, r
->line
);
1322 unsigned int k
, j
, nsyms
;
1324 sympp
= bfd_get_outsymbols (stdoutput
);
1325 nsyms
= bfd_get_symcount (stdoutput
);
1326 for (k
= 0; k
< n
; k
++)
1327 if (((*relocs
[k
]->sym_ptr_ptr
)->flags
& BSF_SECTION_SYM
) == 0)
1329 for (j
= 0; j
< nsyms
; j
++)
1330 if (sympp
[j
] == *relocs
[k
]->sym_ptr_ptr
)
1340 flagword flags
= bfd_get_section_flags (abfd
, sec
);
1342 bfd_set_section_flags (abfd
, sec
, flags
);
1343 bfd_set_reloc (stdoutput
, sec
, relocs
, n
);
1346 #ifdef SET_SECTION_RELOCS
1347 SET_SECTION_RELOCS (sec
, relocs
, n
);
1354 fprintf (stderr
, "relocs for sec %s\n", sec
->name
);
1355 for (k
= 0; k
< n
; k
++)
1357 arelent
*rel
= relocs
[k
];
1358 asymbol
*s
= *rel
->sym_ptr_ptr
;
1359 fprintf (stderr
, " reloc %2d @%p off %4lx : sym %-10s addend %lx\n",
1360 k
, rel
, (unsigned long)rel
->address
, s
->name
,
1361 (unsigned long)rel
->addend
);
1368 compress_frag (struct z_stream_s
*strm
, const char *contents
, int in_size
,
1369 fragS
**last_newf
, struct obstack
*ob
)
1372 int total_out_size
= 0;
1373 fragS
*f
= *last_newf
;
1377 /* Call the compression routine repeatedly until it has finished
1378 processing the frag. */
1381 /* Reserve all the space available in the current chunk.
1382 If none is available, start a new frag. */
1383 avail_out
= obstack_room (ob
);
1386 obstack_finish (ob
);
1387 f
= frag_alloc (ob
);
1388 f
->fr_type
= rs_fill
;
1389 (*last_newf
)->fr_next
= f
;
1391 avail_out
= obstack_room (ob
);
1394 as_fatal (_("can't extend frag"));
1395 next_out
= obstack_next_free (ob
);
1396 obstack_blank_fast (ob
, avail_out
);
1397 out_size
= compress_data (strm
, &contents
, &in_size
,
1398 &next_out
, &avail_out
);
1402 f
->fr_fix
+= out_size
;
1403 total_out_size
+= out_size
;
1405 /* Return unused space. */
1407 obstack_blank_fast (ob
, -avail_out
);
1410 return total_out_size
;
1414 compress_debug (bfd
*abfd
, asection
*sec
, void *xxx ATTRIBUTE_UNUSED
)
1416 segment_info_type
*seginfo
= seg_info (sec
);
1420 struct obstack
*ob
= &seginfo
->frchainP
->frch_obstack
;
1421 bfd_size_type uncompressed_size
= (bfd_size_type
) sec
->size
;
1422 bfd_size_type compressed_size
;
1423 const char *section_name
;
1424 char *compressed_name
;
1426 struct z_stream_s
*strm
;
1428 flagword flags
= bfd_get_section_flags (abfd
, sec
);
1429 unsigned int header_size
, compression_header_size
;
1433 || (flags
& (SEC_ALLOC
| SEC_HAS_CONTENTS
)) == SEC_ALLOC
)
1436 section_name
= bfd_get_section_name (stdoutput
, sec
);
1437 if (strncmp (section_name
, ".debug_", 7) != 0)
1440 strm
= compress_init ();
1444 if (flag_compress_debug
== COMPRESS_DEBUG_GABI_ZLIB
)
1446 compression_header_size
1447 = bfd_get_compression_header_size (stdoutput
, NULL
);
1448 header_size
= compression_header_size
;
1452 compression_header_size
= 0;
1456 /* Create a new frag to contain the compression header. */
1457 first_newf
= frag_alloc (ob
);
1458 if (obstack_room (ob
) < header_size
)
1459 first_newf
= frag_alloc (ob
);
1460 if (obstack_room (ob
) < header_size
)
1461 as_fatal (_("can't extend frag %u chars"), header_size
);
1462 last_newf
= first_newf
;
1463 obstack_blank_fast (ob
, header_size
);
1464 last_newf
->fr_type
= rs_fill
;
1465 last_newf
->fr_fix
= header_size
;
1466 header
= last_newf
->fr_literal
;
1467 compressed_size
= header_size
;
1469 /* Stream the frags through the compression engine, adding new frags
1470 as necessary to accommodate the compressed output. */
1471 for (f
= seginfo
->frchainP
->frch_root
;
1480 gas_assert (f
->fr_type
== rs_fill
);
1483 out_size
= compress_frag (strm
, f
->fr_literal
, f
->fr_fix
,
1487 compressed_size
+= out_size
;
1489 fill_literal
= f
->fr_literal
+ f
->fr_fix
;
1490 fill_size
= f
->fr_var
;
1491 count
= f
->fr_offset
;
1492 gas_assert (count
>= 0);
1493 if (fill_size
&& count
)
1497 out_size
= compress_frag (strm
, fill_literal
, (int) fill_size
,
1501 compressed_size
+= out_size
;
1506 /* Flush the compression state. */
1513 /* Reserve all the space available in the current chunk.
1514 If none is available, start a new frag. */
1515 avail_out
= obstack_room (ob
);
1520 obstack_finish (ob
);
1521 newf
= frag_alloc (ob
);
1522 newf
->fr_type
= rs_fill
;
1523 last_newf
->fr_next
= newf
;
1525 avail_out
= obstack_room (ob
);
1528 as_fatal (_("can't extend frag"));
1529 next_out
= obstack_next_free (ob
);
1530 obstack_blank_fast (ob
, avail_out
);
1531 x
= compress_finish (strm
, &next_out
, &avail_out
, &out_size
);
1535 last_newf
->fr_fix
+= out_size
;
1536 compressed_size
+= out_size
;
1538 /* Return unused space. */
1540 obstack_blank_fast (ob
, -avail_out
);
1546 /* PR binutils/18087: If compression didn't make the section smaller,
1547 just keep it uncompressed. */
1548 if (compressed_size
>= uncompressed_size
)
1551 /* Replace the uncompressed frag list with the compressed frag list. */
1552 seginfo
->frchainP
->frch_root
= first_newf
;
1553 seginfo
->frchainP
->frch_last
= last_newf
;
1555 /* Update the section size and its name. */
1556 bfd_update_compression_header (abfd
, (bfd_byte
*) header
, sec
);
1557 x
= bfd_set_section_size (abfd
, sec
, compressed_size
);
1559 if (!compression_header_size
)
1561 compressed_name
= concat (".z", section_name
+ 1, (char *) NULL
);
1562 bfd_section_name (stdoutput
, sec
) = compressed_name
;
1567 write_contents (bfd
*abfd ATTRIBUTE_UNUSED
,
1569 void *xxx ATTRIBUTE_UNUSED
)
1571 segment_info_type
*seginfo
= seg_info (sec
);
1572 addressT offset
= 0;
1575 /* Write out the frags. */
1577 || !(bfd_get_section_flags (abfd
, sec
) & SEC_HAS_CONTENTS
))
1580 for (f
= seginfo
->frchainP
->frch_root
;
1589 gas_assert (f
->fr_type
== rs_fill
);
1592 x
= bfd_set_section_contents (stdoutput
, sec
,
1593 f
->fr_literal
, (file_ptr
) offset
,
1594 (bfd_size_type
) f
->fr_fix
);
1596 as_fatal (_("can't write %ld bytes to section %s of %s because: '%s'"),
1597 (long) f
->fr_fix
, sec
->name
,
1598 stdoutput
->filename
,
1599 bfd_errmsg (bfd_get_error ()));
1600 offset
+= f
->fr_fix
;
1602 fill_literal
= f
->fr_literal
+ f
->fr_fix
;
1603 fill_size
= f
->fr_var
;
1604 count
= f
->fr_offset
;
1605 gas_assert (count
>= 0);
1606 if (fill_size
&& count
)
1609 if (fill_size
> sizeof (buf
))
1611 /* Do it the old way. Can this ever happen? */
1614 x
= bfd_set_section_contents (stdoutput
, sec
,
1617 (bfd_size_type
) fill_size
);
1619 as_fatal (_("can't fill %ld bytes in section %s of %s because '%s'"),
1620 (long) fill_size
, sec
->name
,
1621 stdoutput
->filename
,
1622 bfd_errmsg (bfd_get_error ()));
1623 offset
+= fill_size
;
1628 /* Build a buffer full of fill objects and output it as
1629 often as necessary. This saves on the overhead of
1630 potentially lots of bfd_set_section_contents calls. */
1634 n_per_buf
= sizeof (buf
);
1635 memset (buf
, *fill_literal
, n_per_buf
);
1640 n_per_buf
= sizeof (buf
) / fill_size
;
1641 for (i
= n_per_buf
, bufp
= buf
; i
; i
--, bufp
+= fill_size
)
1642 memcpy (bufp
, fill_literal
, fill_size
);
1644 for (; count
> 0; count
-= n_per_buf
)
1646 n_per_buf
= n_per_buf
> count
? count
: n_per_buf
;
1647 x
= bfd_set_section_contents
1648 (stdoutput
, sec
, buf
, (file_ptr
) offset
,
1649 (bfd_size_type
) n_per_buf
* fill_size
);
1651 as_fatal (_("cannot fill %ld bytes in section %s of %s because: '%s'"),
1652 (long)(n_per_buf
* fill_size
), sec
->name
,
1653 stdoutput
->filename
,
1654 bfd_errmsg (bfd_get_error ()));
1655 offset
+= n_per_buf
* fill_size
;
1663 merge_data_into_text (void)
1665 seg_info (text_section
)->frchainP
->frch_last
->fr_next
=
1666 seg_info (data_section
)->frchainP
->frch_root
;
1667 seg_info (text_section
)->frchainP
->frch_last
=
1668 seg_info (data_section
)->frchainP
->frch_last
;
1669 seg_info (data_section
)->frchainP
= 0;
1680 /* Count symbols. We can't rely on a count made by the loop in
1681 write_object_file, because *_frob_file may add a new symbol or
1684 for (symp
= symbol_rootP
; symp
; symp
= symbol_next (symp
))
1690 bfd_size_type amt
= (bfd_size_type
) nsyms
* sizeof (asymbol
*);
1692 asympp
= (asymbol
**) bfd_alloc (stdoutput
, amt
);
1693 symp
= symbol_rootP
;
1694 for (i
= 0; i
< nsyms
; i
++, symp
= symbol_next (symp
))
1696 asympp
[i
] = symbol_get_bfdsym (symp
);
1697 if (asympp
[i
]->flags
!= BSF_SECTION_SYM
1698 || !(bfd_is_const_section (asympp
[i
]->section
)
1699 && asympp
[i
]->section
->symbol
== asympp
[i
]))
1700 asympp
[i
]->flags
|= BSF_KEEP
;
1701 symbol_mark_written (symp
);
1706 result
= bfd_set_symtab (stdoutput
, asympp
, nsyms
);
1707 gas_assert (result
);
1708 symbol_table_frozen
= 1;
1711 /* Finish the subsegments. After every sub-segment, we fake an
1712 ".align ...". This conforms to BSD4.2 brain-damage. We then fake
1713 ".fill 0" because that is the kind of frag that requires least
1714 thought. ".align" frags like to have a following frag since that
1715 makes calculating their intended length trivial. */
1717 #ifndef SUB_SEGMENT_ALIGN
1719 /* The last subsegment gets an alignment corresponding to the alignment
1720 of the section. This allows proper nop-filling at the end of
1721 code-bearing sections. */
1722 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) \
1723 (!(FRCHAIN)->frch_next && subseg_text_p (SEG) \
1724 && !do_not_pad_sections_to_alignment \
1725 ? get_recorded_alignment (SEG) \
1728 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) 0
1733 subsegs_finish_section (asection
*s
)
1735 struct frchain
*frchainP
;
1736 segment_info_type
*seginfo
= seg_info (s
);
1740 for (frchainP
= seginfo
->frchainP
;
1742 frchainP
= frchainP
->frch_next
)
1746 subseg_set (s
, frchainP
->frch_subseg
);
1748 /* This now gets called even if we had errors. In that case,
1749 any alignment is meaningless, and, moreover, will look weird
1750 if we are generating a listing. */
1752 do_not_pad_sections_to_alignment
= 1;
1754 alignment
= SUB_SEGMENT_ALIGN (now_seg
, frchainP
);
1755 if ((bfd_get_section_flags (now_seg
->owner
, now_seg
) & SEC_MERGE
)
1756 && now_seg
->entsize
)
1758 unsigned int entsize
= now_seg
->entsize
;
1761 while ((entsize
& 1) == 0)
1767 if (entalign
> alignment
)
1768 alignment
= entalign
;
1771 if (subseg_text_p (now_seg
))
1772 frag_align_code (alignment
, 0);
1774 frag_align (alignment
, 0, 0);
1776 /* frag_align will have left a new frag.
1777 Use this last frag for an empty ".fill".
1779 For this segment ...
1780 Create a last frag. Do not leave a "being filled in frag". */
1781 frag_wane (frag_now
);
1782 frag_now
->fr_fix
= 0;
1783 know (frag_now
->fr_next
== NULL
);
1788 subsegs_finish (void)
1792 for (s
= stdoutput
->sections
; s
; s
= s
->next
)
1793 subsegs_finish_section (s
);
1798 create_obj_attrs_section (void)
1805 size
= bfd_elf_obj_attr_size (stdoutput
);
1808 name
= get_elf_backend_data (stdoutput
)->obj_attrs_section
;
1810 name
= ".gnu.attributes";
1811 s
= subseg_new (name
, 0);
1812 elf_section_type (s
)
1813 = get_elf_backend_data (stdoutput
)->obj_attrs_section_type
;
1814 bfd_set_section_flags (stdoutput
, s
, SEC_READONLY
| SEC_DATA
);
1816 p
= frag_more (size
);
1817 bfd_elf_set_obj_attr_contents (stdoutput
, (bfd_byte
*)p
, size
);
1819 subsegs_finish_section (s
);
1820 relax_segment (seg_info (s
)->frchainP
->frch_root
, s
, 0);
1821 size_seg (stdoutput
, s
, NULL
);
1826 /* Write the object file. */
1829 write_object_file (void)
1831 struct relax_seg_info rsi
;
1832 #ifndef WORKING_DOT_WORD
1833 fragS
*fragP
; /* Track along all frags. */
1838 #ifdef md_pre_output_hook
1842 #ifdef md_pre_relax_hook
1846 /* From now on, we don't care about sub-segments. Build one frag chain
1847 for each segment. Linked through fr_next. */
1849 /* Remove the sections created by gas for its own purposes. */
1853 bfd_section_list_remove (stdoutput
, reg_section
);
1854 bfd_section_list_remove (stdoutput
, expr_section
);
1855 stdoutput
->section_count
-= 2;
1857 bfd_map_over_sections (stdoutput
, renumber_sections
, &i
);
1860 bfd_map_over_sections (stdoutput
, chain_frchains_together
, (char *) 0);
1862 /* We have two segments. If user gave -R flag, then we must put the
1863 data frags into the text segment. Do this before relaxing so
1864 we know to take advantage of -R and make shorter addresses. */
1865 if (flag_readonly_data_in_text
)
1867 merge_data_into_text ();
1873 #ifndef WORKING_DOT_WORD
1874 /* We need to reset the markers in the broken word list and
1875 associated frags between calls to relax_segment (via
1876 relax_seg). Since the broken word list is global, we do it
1877 once per round, rather than locally in relax_segment for each
1879 struct broken_word
*brokp
;
1881 for (brokp
= broken_words
;
1882 brokp
!= (struct broken_word
*) NULL
;
1883 brokp
= brokp
->next_broken_word
)
1887 if (brokp
->dispfrag
!= (fragS
*) NULL
1888 && brokp
->dispfrag
->fr_type
== rs_broken_word
)
1889 brokp
->dispfrag
->fr_subtype
= 0;
1894 bfd_map_over_sections (stdoutput
, relax_seg
, &rsi
);
1900 /* Note - Most ports will use the default value of
1901 TC_FINALIZE_SYMS_BEFORE_SIZE_SEG, which 1. This will force
1902 local symbols to be resolved, removing their frag information.
1903 Some ports however, will not have finished relaxing all of
1904 their frags and will still need the local symbol frag
1905 information. These ports can set
1906 TC_FINALIZE_SYMS_BEFORE_SIZE_SEG to 0. */
1907 finalize_syms
= TC_FINALIZE_SYMS_BEFORE_SIZE_SEG
;
1909 bfd_map_over_sections (stdoutput
, size_seg
, (char *) 0);
1911 /* Relaxation has completed. Freeze all syms. */
1914 dwarf2dbg_final_check ();
1916 #ifdef md_post_relax_hook
1922 create_obj_attrs_section ();
1925 #ifndef WORKING_DOT_WORD
1927 struct broken_word
*lie
;
1928 struct broken_word
**prevP
;
1930 prevP
= &broken_words
;
1931 for (lie
= broken_words
; lie
; lie
= lie
->next_broken_word
)
1936 subseg_change (lie
->seg
, lie
->subseg
);
1937 exp
.X_op
= O_subtract
;
1938 exp
.X_add_symbol
= lie
->add
;
1939 exp
.X_op_symbol
= lie
->sub
;
1940 exp
.X_add_number
= lie
->addnum
;
1941 #ifdef TC_CONS_FIX_NEW
1942 TC_CONS_FIX_NEW (lie
->frag
,
1943 lie
->word_goes_here
- lie
->frag
->fr_literal
,
1944 2, &exp
, TC_PARSE_CONS_RETURN_NONE
);
1946 fix_new_exp (lie
->frag
,
1947 lie
->word_goes_here
- lie
->frag
->fr_literal
,
1948 2, &exp
, 0, BFD_RELOC_16
);
1950 *prevP
= lie
->next_broken_word
;
1953 prevP
= &(lie
->next_broken_word
);
1955 for (lie
= broken_words
; lie
;)
1957 struct broken_word
*untruth
;
1959 addressT table_addr
;
1960 addressT from_addr
, to_addr
;
1963 subseg_change (lie
->seg
, lie
->subseg
);
1964 fragP
= lie
->dispfrag
;
1966 /* Find out how many broken_words go here. */
1969 untruth
&& untruth
->dispfrag
== fragP
;
1970 untruth
= untruth
->next_broken_word
)
1971 if (untruth
->added
== 1)
1974 table_ptr
= lie
->dispfrag
->fr_opcode
;
1975 table_addr
= (lie
->dispfrag
->fr_address
1976 + (table_ptr
- lie
->dispfrag
->fr_literal
));
1977 /* Create the jump around the long jumps. This is a short
1978 jump from table_ptr+0 to table_ptr+n*long_jump_size. */
1979 from_addr
= table_addr
;
1980 to_addr
= table_addr
+ md_short_jump_size
+ n
* md_long_jump_size
;
1981 md_create_short_jump (table_ptr
, from_addr
, to_addr
, lie
->dispfrag
,
1983 table_ptr
+= md_short_jump_size
;
1984 table_addr
+= md_short_jump_size
;
1987 lie
&& lie
->dispfrag
== fragP
;
1988 m
++, lie
= lie
->next_broken_word
)
1990 if (lie
->added
== 2)
1992 /* Patch the jump table. */
1993 for (untruth
= (struct broken_word
*) (fragP
->fr_symbol
);
1994 untruth
&& untruth
->dispfrag
== fragP
;
1995 untruth
= untruth
->next_broken_word
)
1997 if (untruth
->use_jump
== lie
)
1999 /* This is the offset from ??? to table_ptr+0.
2000 The target is the same for all users of this
2001 md_long_jump, but the "sub" bases (and hence the
2002 offsets) may be different. */
2003 addressT to_word
= table_addr
- S_GET_VALUE (untruth
->sub
);
2004 #ifdef TC_CHECK_ADJUSTED_BROKEN_DOT_WORD
2005 TC_CHECK_ADJUSTED_BROKEN_DOT_WORD (to_word
, untruth
);
2007 md_number_to_chars (untruth
->word_goes_here
, to_word
, 2);
2011 /* Install the long jump. */
2012 /* This is a long jump from table_ptr+0 to the final target. */
2013 from_addr
= table_addr
;
2014 to_addr
= S_GET_VALUE (lie
->add
) + lie
->addnum
;
2015 md_create_long_jump (table_ptr
, from_addr
, to_addr
, lie
->dispfrag
,
2017 table_ptr
+= md_long_jump_size
;
2018 table_addr
+= md_long_jump_size
;
2022 #endif /* not WORKING_DOT_WORD */
2024 /* Resolve symbol values. This needs to be done before processing
2030 for (symp
= symbol_rootP
; symp
; symp
= symbol_next (symp
))
2031 resolve_symbol_value (symp
);
2033 resolve_local_symbol_values ();
2034 resolve_reloc_expr_symbols ();
2038 #ifdef tc_frob_file_before_adjust
2039 tc_frob_file_before_adjust ();
2041 #ifdef obj_frob_file_before_adjust
2042 obj_frob_file_before_adjust ();
2045 bfd_map_over_sections (stdoutput
, adjust_reloc_syms
, (char *) 0);
2047 #ifdef tc_frob_file_before_fix
2048 tc_frob_file_before_fix ();
2050 #ifdef obj_frob_file_before_fix
2051 obj_frob_file_before_fix ();
2054 bfd_map_over_sections (stdoutput
, fix_segment
, (char *) 0);
2056 /* Set up symbol table, and write it out. */
2060 bfd_boolean skip_next_symbol
= FALSE
;
2062 for (symp
= symbol_rootP
; symp
; symp
= symbol_next (symp
))
2067 if (skip_next_symbol
)
2069 /* Don't do anything besides moving the value of the
2070 symbol from the GAS value-field to the BFD value-field. */
2071 symbol_get_bfdsym (symp
)->value
= S_GET_VALUE (symp
);
2072 skip_next_symbol
= FALSE
;
2076 if (symbol_mri_common_p (symp
))
2078 if (S_IS_EXTERNAL (symp
))
2079 as_bad (_("%s: global symbols not supported in common sections"),
2081 symbol_remove (symp
, &symbol_rootP
, &symbol_lastP
);
2085 name
= S_GET_NAME (symp
);
2089 decode_local_label_name ((char *) S_GET_NAME (symp
));
2090 /* They only differ if `name' is a fb or dollar local
2092 if (name2
!= name
&& ! S_IS_DEFINED (symp
))
2093 as_bad (_("local label `%s' is not defined"), name2
);
2096 /* Do it again, because adjust_reloc_syms might introduce
2097 more symbols. They'll probably only be section symbols,
2098 but they'll still need to have the values computed. */
2099 resolve_symbol_value (symp
);
2101 /* Skip symbols which were equated to undefined or common
2103 if (symbol_equated_reloc_p (symp
)
2104 || S_IS_WEAKREFR (symp
))
2106 const char *sname
= S_GET_NAME (symp
);
2108 if (S_IS_COMMON (symp
)
2109 && !TC_FAKE_LABEL (sname
)
2110 && !S_IS_WEAKREFR (symp
)
2111 && (!S_IS_EXTERNAL (symp
) || S_IS_LOCAL (symp
)))
2113 expressionS
*e
= symbol_get_value_expression (symp
);
2115 as_bad (_("Local symbol `%s' can't be equated to common symbol `%s'"),
2116 sname
, S_GET_NAME (e
->X_add_symbol
));
2118 if (S_GET_SEGMENT (symp
) == reg_section
)
2120 /* Report error only if we know the symbol name. */
2121 if (S_GET_NAME (symp
) != reg_section
->name
)
2122 as_bad (_("can't make global register symbol `%s'"),
2125 symbol_remove (symp
, &symbol_rootP
, &symbol_lastP
);
2129 #ifdef obj_frob_symbol
2130 obj_frob_symbol (symp
, punt
);
2132 #ifdef tc_frob_symbol
2133 if (! punt
|| symbol_used_in_reloc_p (symp
))
2134 tc_frob_symbol (symp
, punt
);
2137 /* If we don't want to keep this symbol, splice it out of
2138 the chain now. If EMIT_SECTION_SYMBOLS is 0, we never
2139 want section symbols. Otherwise, we skip local symbols
2140 and symbols that the frob_symbol macros told us to punt,
2141 but we keep such symbols if they are used in relocs. */
2142 if (symp
== abs_section_sym
2143 || (! EMIT_SECTION_SYMBOLS
2144 && symbol_section_p (symp
))
2145 /* Note that S_IS_EXTERNAL and S_IS_LOCAL are not always
2146 opposites. Sometimes the former checks flags and the
2147 latter examines the name... */
2148 || (!S_IS_EXTERNAL (symp
)
2149 && (punt
|| S_IS_LOCAL (symp
) ||
2150 (S_IS_WEAKREFD (symp
) && ! symbol_used_p (symp
)))
2151 && ! symbol_used_in_reloc_p (symp
)))
2153 symbol_remove (symp
, &symbol_rootP
, &symbol_lastP
);
2155 /* After symbol_remove, symbol_next(symp) still returns
2156 the one that came after it in the chain. So we don't
2157 need to do any extra cleanup work here. */
2161 /* Make sure we really got a value for the symbol. */
2162 if (! symbol_resolved_p (symp
))
2164 as_bad (_("can't resolve value for symbol `%s'"),
2166 symbol_mark_resolved (symp
);
2169 /* Set the value into the BFD symbol. Up til now the value
2170 has only been kept in the gas symbolS struct. */
2171 symbol_get_bfdsym (symp
)->value
= S_GET_VALUE (symp
);
2173 /* A warning construct is a warning symbol followed by the
2174 symbol warned about. Don't let anything object-format or
2175 target-specific muck with it; it's ready for output. */
2176 if (symbol_get_bfdsym (symp
)->flags
& BSF_WARNING
)
2177 skip_next_symbol
= TRUE
;
2183 /* Now do any format-specific adjustments to the symbol table, such
2184 as adding file symbols. */
2185 #ifdef tc_adjust_symtab
2186 tc_adjust_symtab ();
2188 #ifdef obj_adjust_symtab
2189 obj_adjust_symtab ();
2192 /* Stop if there is an error. */
2196 /* Now that all the sizes are known, and contents correct, we can
2197 start writing to the file. */
2200 /* If *_frob_file changes the symbol value at this point, it is
2201 responsible for moving the changed value into symp->bsym->value
2202 as well. Hopefully all symbol value changing can be done in
2207 #ifdef obj_frob_file
2210 #ifdef obj_coff_generate_pdata
2211 obj_coff_generate_pdata ();
2213 bfd_map_over_sections (stdoutput
, write_relocs
, (char *) 0);
2215 #ifdef tc_frob_file_after_relocs
2216 tc_frob_file_after_relocs ();
2218 #ifdef obj_frob_file_after_relocs
2219 obj_frob_file_after_relocs ();
2222 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
2223 if (IS_ELF
&& flag_use_elf_stt_common
)
2224 stdoutput
->flags
|= BFD_CONVERT_ELF_COMMON
| BFD_USE_ELF_STT_COMMON
;
2227 /* Once all relocations have been written, we can compress the
2228 contents of the debug sections. This needs to be done before
2229 we start writing any sections, because it will affect the file
2230 layout, which is fixed once we start writing contents. */
2231 if (flag_compress_debug
)
2233 if (flag_compress_debug
== COMPRESS_DEBUG_GABI_ZLIB
)
2234 stdoutput
->flags
|= BFD_COMPRESS
| BFD_COMPRESS_GABI
;
2236 stdoutput
->flags
|= BFD_COMPRESS
;
2237 bfd_map_over_sections (stdoutput
, compress_debug
, (char *) 0);
2240 bfd_map_over_sections (stdoutput
, write_contents
, (char *) 0);
2243 #ifdef TC_GENERIC_RELAX_TABLE
2244 /* Relax a fragment by scanning TC_GENERIC_RELAX_TABLE. */
2247 relax_frag (segT segment
, fragS
*fragP
, long stretch
)
2249 const relax_typeS
*this_type
;
2250 const relax_typeS
*start_type
;
2251 relax_substateT next_state
;
2252 relax_substateT this_state
;
2258 const relax_typeS
*table
;
2260 target
= fragP
->fr_offset
;
2261 address
= fragP
->fr_address
;
2262 table
= TC_GENERIC_RELAX_TABLE
;
2263 this_state
= fragP
->fr_subtype
;
2264 start_type
= this_type
= table
+ this_state
;
2265 symbolP
= fragP
->fr_symbol
;
2271 sym_frag
= symbol_get_frag (symbolP
);
2273 #ifndef DIFF_EXPR_OK
2274 know (sym_frag
!= NULL
);
2276 know (S_GET_SEGMENT (symbolP
) != absolute_section
2277 || sym_frag
== &zero_address_frag
);
2278 target
+= S_GET_VALUE (symbolP
);
2280 /* If SYM_FRAG has yet to be reached on this pass, assume it
2281 will move by STRETCH just as we did, unless there is an
2282 alignment frag between here and SYM_FRAG. An alignment may
2283 well absorb any STRETCH, and we don't want to choose a larger
2284 branch insn by overestimating the needed reach of this
2285 branch. It isn't critical to calculate TARGET exactly; We
2286 know we'll be doing another pass if STRETCH is non-zero. */
2289 && sym_frag
->relax_marker
!= fragP
->relax_marker
2290 && S_GET_SEGMENT (symbolP
) == segment
)
2293 || sym_frag
->region
== fragP
->region
)
2295 /* If we get here we know we have a forward branch. This
2296 relax pass may have stretched previous instructions so
2297 far that omitting STRETCH would make the branch
2298 negative. Don't allow this in case the negative reach is
2299 large enough to require a larger branch instruction. */
2300 else if (target
< address
)
2301 target
= fragP
->fr_next
->fr_address
+ stretch
;
2305 aim
= target
- address
- fragP
->fr_fix
;
2306 #ifdef TC_PCREL_ADJUST
2307 /* Currently only the ns32k family needs this. */
2308 aim
+= TC_PCREL_ADJUST (fragP
);
2311 #ifdef md_prepare_relax_scan
2312 /* Formerly called M68K_AIM_KLUDGE. */
2313 md_prepare_relax_scan (fragP
, address
, aim
, this_state
, this_type
);
2318 /* Look backwards. */
2319 for (next_state
= this_type
->rlx_more
; next_state
;)
2320 if (aim
>= this_type
->rlx_backward
)
2324 /* Grow to next state. */
2325 this_state
= next_state
;
2326 this_type
= table
+ this_state
;
2327 next_state
= this_type
->rlx_more
;
2332 /* Look forwards. */
2333 for (next_state
= this_type
->rlx_more
; next_state
;)
2334 if (aim
<= this_type
->rlx_forward
)
2338 /* Grow to next state. */
2339 this_state
= next_state
;
2340 this_type
= table
+ this_state
;
2341 next_state
= this_type
->rlx_more
;
2345 growth
= this_type
->rlx_length
- start_type
->rlx_length
;
2347 fragP
->fr_subtype
= this_state
;
2351 #endif /* defined (TC_GENERIC_RELAX_TABLE) */
2353 /* Relax_align. Advance location counter to next address that has 'alignment'
2354 lowest order bits all 0s, return size of adjustment made. */
2355 static relax_addressT
2356 relax_align (relax_addressT address
, /* Address now. */
2357 int alignment
/* Alignment (binary). */)
2359 relax_addressT mask
;
2360 relax_addressT new_address
;
2362 mask
= ~((relax_addressT
) ~0 << alignment
);
2363 new_address
= (address
+ mask
) & (~mask
);
2364 #ifdef LINKER_RELAXING_SHRINKS_ONLY
2366 /* We must provide lots of padding, so the linker can discard it
2367 when needed. The linker will not add extra space, ever. */
2368 new_address
+= (1 << alignment
);
2370 return (new_address
- address
);
2373 /* Now we have a segment, not a crowd of sub-segments, we can make
2378 After this, all frags in this segment have addresses that are correct
2379 within the segment. Since segments live in different file addresses,
2380 these frag addresses may not be the same as final object-file
2384 relax_segment (struct frag
*segment_frag_root
, segT segment
, int pass
)
2386 unsigned long frag_count
;
2388 relax_addressT address
;
2392 /* In case md_estimate_size_before_relax() wants to make fixSs. */
2393 subseg_change (segment
, 0);
2395 /* For each frag in segment: count and store (a 1st guess of)
2399 for (frag_count
= 0, fragP
= segment_frag_root
;
2401 fragP
= fragP
->fr_next
, frag_count
++)
2403 fragP
->region
= region
;
2404 fragP
->relax_marker
= 0;
2405 fragP
->fr_address
= address
;
2406 address
+= fragP
->fr_fix
;
2408 switch (fragP
->fr_type
)
2411 address
+= fragP
->fr_offset
* fragP
->fr_var
;
2418 addressT offset
= relax_align (address
, (int) fragP
->fr_offset
);
2420 if (fragP
->fr_subtype
!= 0 && offset
> fragP
->fr_subtype
)
2423 if (offset
% fragP
->fr_var
!= 0)
2425 as_bad_where (fragP
->fr_file
, fragP
->fr_line
,
2426 _("alignment padding (%lu bytes) not a multiple of %ld"),
2427 (unsigned long) offset
, (long) fragP
->fr_var
);
2428 offset
-= (offset
% fragP
->fr_var
);
2437 /* Assume .org is nugatory. It will grow with 1st relax. */
2444 case rs_machine_dependent
:
2445 /* If fr_symbol is an expression, this call to
2446 resolve_symbol_value sets up the correct segment, which will
2447 likely be needed in md_estimate_size_before_relax. */
2448 if (fragP
->fr_symbol
)
2449 resolve_symbol_value (fragP
->fr_symbol
);
2451 address
+= md_estimate_size_before_relax (fragP
, segment
);
2454 #ifndef WORKING_DOT_WORD
2455 /* Broken words don't concern us yet. */
2456 case rs_broken_word
:
2461 /* Initial guess is always 1; doing otherwise can result in
2462 stable solutions that are larger than the minimum. */
2463 address
+= fragP
->fr_offset
= 1;
2467 address
+= eh_frame_estimate_size_before_relax (fragP
);
2471 address
+= dwarf2dbg_estimate_size_before_relax (fragP
);
2475 BAD_CASE (fragP
->fr_type
);
2482 unsigned long max_iterations
;
2484 /* Cumulative address adjustment. */
2487 /* Have we made any adjustment this pass? We can't just test
2488 stretch because one piece of code may have grown and another
2492 /* Most horrible, but gcc may give us some exception data that
2493 is impossible to assemble, of the form
2497 .uleb128 end - start
2503 If the leb128 is two bytes in size, then end-start is 128*128,
2504 which requires a three byte leb128. If the leb128 is three
2505 bytes in size, then end-start is 128*128-1, which requires a
2506 two byte leb128. We work around this dilemma by inserting
2507 an extra 4 bytes of alignment just after the .align. This
2508 works because the data after the align is accessed relative to
2511 This counter is used in a tiny state machine to detect
2512 whether a leb128 followed by an align is impossible to
2514 int rs_leb128_fudge
= 0;
2516 /* We want to prevent going into an infinite loop where one frag grows
2517 depending upon the location of a symbol which is in turn moved by
2518 the growing frag. eg:
2524 So we dictate that this algorithm can be at most O2. */
2525 max_iterations
= frag_count
* frag_count
;
2526 /* Check for overflow. */
2527 if (max_iterations
< frag_count
)
2528 max_iterations
= frag_count
;
2536 for (fragP
= segment_frag_root
; fragP
; fragP
= fragP
->fr_next
)
2539 addressT was_address
;
2543 fragP
->relax_marker
^= 1;
2544 was_address
= fragP
->fr_address
;
2545 address
= fragP
->fr_address
+= stretch
;
2546 symbolP
= fragP
->fr_symbol
;
2547 offset
= fragP
->fr_offset
;
2549 switch (fragP
->fr_type
)
2551 case rs_fill
: /* .fill never relaxes. */
2555 #ifndef WORKING_DOT_WORD
2556 /* JF: This is RMS's idea. I do *NOT* want to be blamed
2557 for it I do not want to write it. I do not want to have
2558 anything to do with it. This is not the proper way to
2559 implement this misfeature. */
2560 case rs_broken_word
:
2562 struct broken_word
*lie
;
2563 struct broken_word
*untruth
;
2565 /* Yes this is ugly (storing the broken_word pointer
2566 in the symbol slot). Still, this whole chunk of
2567 code is ugly, and I don't feel like doing anything
2568 about it. Think of it as stubbornness in action. */
2570 for (lie
= (struct broken_word
*) (fragP
->fr_symbol
);
2571 lie
&& lie
->dispfrag
== fragP
;
2572 lie
= lie
->next_broken_word
)
2578 offset
= (S_GET_VALUE (lie
->add
)
2580 - S_GET_VALUE (lie
->sub
));
2581 if (offset
<= -32768 || offset
>= 32767)
2583 if (flag_warn_displacement
)
2586 sprint_value (buf
, (addressT
) lie
->addnum
);
2587 as_warn_where (fragP
->fr_file
, fragP
->fr_line
,
2588 _(".word %s-%s+%s didn't fit"),
2589 S_GET_NAME (lie
->add
),
2590 S_GET_NAME (lie
->sub
),
2593 if (fragP
->fr_subtype
== 0)
2595 fragP
->fr_subtype
++;
2596 growth
+= md_short_jump_size
;
2599 /* Redirect *all* words of this table with the same
2600 target, lest we have to handle the case where the
2601 same target but with a offset that fits on this
2602 round overflows at the next relaxation round. */
2603 for (untruth
= (struct broken_word
*) (fragP
->fr_symbol
);
2604 untruth
&& untruth
->dispfrag
== lie
->dispfrag
;
2605 untruth
= untruth
->next_broken_word
)
2606 if ((symbol_get_frag (untruth
->add
)
2607 == symbol_get_frag (lie
->add
))
2608 && (S_GET_VALUE (untruth
->add
)
2609 == S_GET_VALUE (lie
->add
)))
2612 untruth
->use_jump
= lie
;
2616 growth
+= md_long_jump_size
;
2621 } /* case rs_broken_word */
2627 addressT oldoff
, newoff
;
2629 oldoff
= relax_align (was_address
+ fragP
->fr_fix
,
2631 newoff
= relax_align (address
+ fragP
->fr_fix
,
2634 if (fragP
->fr_subtype
!= 0)
2636 if (oldoff
> fragP
->fr_subtype
)
2638 if (newoff
> fragP
->fr_subtype
)
2642 growth
= newoff
- oldoff
;
2644 /* If this align happens to follow a leb128 and
2645 we have determined that the leb128 is bouncing
2646 in size, then break the cycle by inserting an
2649 && (rs_leb128_fudge
& 16) != 0
2650 && (rs_leb128_fudge
& 15) >= 2)
2652 segment_info_type
*seginfo
= seg_info (segment
);
2653 struct obstack
*ob
= &seginfo
->frchainP
->frch_obstack
;
2656 newf
= frag_alloc (ob
);
2657 obstack_blank_fast (ob
, fragP
->fr_var
);
2658 obstack_finish (ob
);
2659 memcpy (newf
, fragP
, SIZEOF_STRUCT_FRAG
);
2660 memcpy (newf
->fr_literal
,
2661 fragP
->fr_literal
+ fragP
->fr_fix
,
2663 newf
->fr_type
= rs_fill
;
2664 newf
->fr_address
= address
+ fragP
->fr_fix
+ newoff
;
2666 newf
->fr_offset
= (((offsetT
) 1 << fragP
->fr_offset
)
2668 if (newf
->fr_offset
* newf
->fr_var
2669 != (offsetT
) 1 << fragP
->fr_offset
)
2671 newf
->fr_offset
= (offsetT
) 1 << fragP
->fr_offset
;
2674 /* Include size of new frag in GROWTH. */
2675 growth
+= newf
->fr_offset
* newf
->fr_var
;
2676 /* Adjust the new frag address for the amount
2677 we'll add when we process the new frag. */
2678 newf
->fr_address
-= stretch
+ growth
;
2679 newf
->relax_marker
^= 1;
2680 fragP
->fr_next
= newf
;
2682 as_warn (_("padding added"));
2690 addressT target
= offset
;
2695 /* Convert from an actual address to an octet offset
2696 into the section. Here it is assumed that the
2697 section's VMA is zero, and can omit subtracting it
2698 from the symbol's value to get the address offset. */
2699 know (S_GET_SEGMENT (symbolP
)->vma
== 0);
2700 target
+= S_GET_VALUE (symbolP
) * OCTETS_PER_BYTE
;
2703 know (fragP
->fr_next
);
2704 after
= fragP
->fr_next
->fr_address
+ stretch
;
2705 growth
= target
- after
;
2707 /* Growth may be negative, but variable part of frag
2708 cannot have fewer than 0 chars. That is, we can't
2710 if (address
+ fragP
->fr_fix
> target
)
2714 /* Don't error on first few frag relax passes.
2715 The symbol might be an expression involving
2716 symbol values from other sections. If those
2717 sections have not yet been processed their
2718 frags will all have zero addresses, so we
2719 will calculate incorrect values for them. The
2720 number of passes we allow before giving an
2721 error is somewhat arbitrary. It should be at
2722 least one, with larger values requiring
2723 increasingly contrived dependencies between
2724 frags to trigger a false error. */
2727 /* Force another pass. */
2732 as_bad_where (fragP
->fr_file
, fragP
->fr_line
,
2733 _("attempt to move .org backwards"));
2735 /* We've issued an error message. Change the
2736 frag to avoid cascading errors. */
2737 fragP
->fr_type
= rs_align
;
2738 fragP
->fr_subtype
= 0;
2739 fragP
->fr_offset
= 0;
2740 fragP
->fr_fix
= after
- address
;
2751 amount
= S_GET_VALUE (symbolP
);
2752 if (S_GET_SEGMENT (symbolP
) != absolute_section
2753 || S_IS_COMMON (symbolP
)
2754 || ! S_IS_DEFINED (symbolP
))
2756 as_bad_where (fragP
->fr_file
, fragP
->fr_line
,
2757 _(".space specifies non-absolute value"));
2758 /* Prevent repeat of this error message. */
2759 fragP
->fr_symbol
= 0;
2761 else if (amount
< 0)
2763 /* Don't error on first few frag relax passes.
2764 See rs_org comment for a longer explanation. */
2771 as_warn_where (fragP
->fr_file
, fragP
->fr_line
,
2772 _(".space or .fill with negative value, ignored"));
2773 fragP
->fr_symbol
= 0;
2776 growth
= (was_address
+ fragP
->fr_fix
+ amount
2777 - fragP
->fr_next
->fr_address
);
2781 case rs_machine_dependent
:
2782 #ifdef md_relax_frag
2783 growth
= md_relax_frag (segment
, fragP
, stretch
);
2785 #ifdef TC_GENERIC_RELAX_TABLE
2786 /* The default way to relax a frag is to look through
2787 TC_GENERIC_RELAX_TABLE. */
2788 growth
= relax_frag (segment
, fragP
, stretch
);
2789 #endif /* TC_GENERIC_RELAX_TABLE */
2798 value
= resolve_symbol_value (fragP
->fr_symbol
);
2799 size
= sizeof_leb128 (value
, fragP
->fr_subtype
);
2800 growth
= size
- fragP
->fr_offset
;
2801 fragP
->fr_offset
= size
;
2806 growth
= eh_frame_relax_frag (fragP
);
2810 growth
= dwarf2dbg_relax_frag (fragP
);
2814 BAD_CASE (fragP
->fr_type
);
2821 if (fragP
->fr_type
== rs_leb128
)
2822 rs_leb128_fudge
+= 16;
2823 else if (fragP
->fr_type
== rs_align
2824 && (rs_leb128_fudge
& 16) != 0
2826 rs_leb128_fudge
+= 16;
2828 rs_leb128_fudge
= 0;
2833 && (rs_leb128_fudge
& 16) == 0
2834 && (rs_leb128_fudge
& -16) != 0)
2835 rs_leb128_fudge
+= 1;
2837 rs_leb128_fudge
= 0;
2839 /* Until nothing further to relax. */
2840 while (stretched
&& -- max_iterations
);
2843 as_fatal (_("Infinite loop encountered whilst attempting to compute the addresses of symbols in section %s"),
2844 segment_name (segment
));
2847 for (fragP
= segment_frag_root
; fragP
; fragP
= fragP
->fr_next
)
2848 if (fragP
->last_fr_address
!= fragP
->fr_address
)
2850 fragP
->last_fr_address
= fragP
->fr_address
;
2857 number_to_chars_bigendian (char *buf
, valueT val
, int n
)
2863 buf
[n
] = val
& 0xff;
2869 number_to_chars_littleendian (char *buf
, valueT val
, int n
)
2875 *buf
++ = val
& 0xff;
2881 write_print_statistics (FILE *file
)
2883 fprintf (file
, "fixups: %d\n", n_fixups
);
2886 /* For debugging. */
2887 extern int indent_level
;
2890 print_fixup (fixS
*fixp
)
2893 fprintf (stderr
, "fix ");
2894 fprintf_vma (stderr
, (bfd_vma
)((bfd_hostptr_t
) fixp
));
2895 fprintf (stderr
, " %s:%d",fixp
->fx_file
, fixp
->fx_line
);
2897 fprintf (stderr
, " pcrel");
2898 if (fixp
->fx_pcrel_adjust
)
2899 fprintf (stderr
, " pcrel_adjust=%d", fixp
->fx_pcrel_adjust
);
2900 if (fixp
->fx_im_disp
)
2903 fprintf (stderr
, " im_disp=%d", fixp
->fx_im_disp
);
2905 fprintf (stderr
, " im_disp");
2909 fprintf (stderr
, " tcbit");
2911 fprintf (stderr
, " done");
2912 fprintf (stderr
, "\n size=%d frag=", fixp
->fx_size
);
2913 fprintf_vma (stderr
, (bfd_vma
) ((bfd_hostptr_t
) fixp
->fx_frag
));
2914 fprintf (stderr
, " where=%ld offset=%lx addnumber=%lx",
2915 (long) fixp
->fx_where
,
2916 (unsigned long) fixp
->fx_offset
,
2917 (unsigned long) fixp
->fx_addnumber
);
2918 fprintf (stderr
, "\n %s (%d)", bfd_get_reloc_code_name (fixp
->fx_r_type
),
2922 fprintf (stderr
, "\n +<");
2923 print_symbol_value_1 (stderr
, fixp
->fx_addsy
);
2924 fprintf (stderr
, ">");
2928 fprintf (stderr
, "\n -<");
2929 print_symbol_value_1 (stderr
, fixp
->fx_subsy
);
2930 fprintf (stderr
, ">");
2932 fprintf (stderr
, "\n");
2933 #ifdef TC_FIX_DATA_PRINT
2934 TC_FIX_DATA_PRINT (stderr
, fixp
);