1 /* write.c - emit .o file
2 Copyright 1986, 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
3 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
4 2010 Free Software Foundation, Inc.
6 This file is part of GAS, the GNU Assembler.
8 GAS is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3, or (at your option)
13 GAS is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GAS; see the file COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
23 /* This thing should be set up to do byteordering correctly. But... */
28 #include "output-file.h"
29 #include "dwarf2dbg.h"
31 #include "compress-debug.h"
33 #ifndef TC_ADJUST_RELOC_COUNT
34 #define TC_ADJUST_RELOC_COUNT(FIX, COUNT)
37 #ifndef TC_FORCE_RELOCATION
38 #define TC_FORCE_RELOCATION(FIX) \
39 (generic_force_reloc (FIX))
42 #ifndef TC_FORCE_RELOCATION_ABS
43 #define TC_FORCE_RELOCATION_ABS(FIX) \
44 (TC_FORCE_RELOCATION (FIX))
47 #ifndef TC_FORCE_RELOCATION_LOCAL
48 #define TC_FORCE_RELOCATION_LOCAL(FIX) \
50 || TC_FORCE_RELOCATION (FIX))
53 #ifndef TC_FORCE_RELOCATION_SUB_SAME
54 #define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEG) \
58 #ifndef md_register_arithmetic
59 # define md_register_arithmetic 1
62 #ifndef TC_FORCE_RELOCATION_SUB_ABS
63 #define TC_FORCE_RELOCATION_SUB_ABS(FIX, SEG) \
64 (!md_register_arithmetic && (SEG) == reg_section)
67 #ifndef TC_FORCE_RELOCATION_SUB_LOCAL
69 #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG) \
70 (!md_register_arithmetic && (SEG) == reg_section)
72 #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG) 1
76 #ifndef TC_VALIDATE_FIX_SUB
77 #ifdef UNDEFINED_DIFFERENCE_OK
78 /* The PA needs this for PIC code generation. */
79 #define TC_VALIDATE_FIX_SUB(FIX, SEG) \
80 (md_register_arithmetic || (SEG) != reg_section)
82 #define TC_VALIDATE_FIX_SUB(FIX, SEG) \
83 ((md_register_arithmetic || (SEG) != reg_section) \
84 && ((FIX)->fx_r_type == BFD_RELOC_GPREL32 \
85 || (FIX)->fx_r_type == BFD_RELOC_GPREL16))
89 #ifndef TC_LINKRELAX_FIXUP
90 #define TC_LINKRELAX_FIXUP(SEG) 1
93 #ifndef MD_APPLY_SYM_VALUE
94 #define MD_APPLY_SYM_VALUE(FIX) 1
97 #ifndef TC_FINALIZE_SYMS_BEFORE_SIZE_SEG
98 #define TC_FINALIZE_SYMS_BEFORE_SIZE_SEG 1
101 #ifndef MD_PCREL_FROM_SECTION
102 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from (FIX)
105 #ifndef TC_FAKE_LABEL
106 #define TC_FAKE_LABEL(NAME) (strcmp ((NAME), FAKE_LABEL_NAME) == 0)
109 /* Positive values of TC_FX_SIZE_SLACK allow a target to define
110 fixups that far past the end of a frag. Having such fixups
111 is of course most most likely a bug in setting fx_size correctly.
112 A negative value disables the fixup check entirely, which is
113 appropriate for something like the Renesas / SuperH SH_COUNT
115 #ifndef TC_FX_SIZE_SLACK
116 #define TC_FX_SIZE_SLACK(FIX) 0
119 /* Used to control final evaluation of expressions. */
120 int finalize_syms
= 0;
122 int symbol_table_frozen
;
124 symbolS
*abs_section_sym
;
126 /* Remember the value of dot when parsing expressions. */
129 /* Relocs generated by ".reloc" pseudo. */
130 struct reloc_list
* reloc_list
;
132 void print_fixup (fixS
*);
134 /* We generally attach relocs to frag chains. However, after we have
135 chained these all together into a segment, any relocs we add after
136 that must be attached to a segment. This will include relocs added
137 in md_estimate_size_for_relax, for example. */
138 static int frags_chained
= 0;
142 #define RELOC_ENUM enum bfd_reloc_code_real
144 /* Create a fixS in obstack 'notes'. */
147 fix_new_internal (fragS
*frag
, /* Which frag? */
148 int where
, /* Where in that frag? */
149 int size
, /* 1, 2, or 4 usually. */
150 symbolS
*add_symbol
, /* X_add_symbol. */
151 symbolS
*sub_symbol
, /* X_op_symbol. */
152 offsetT offset
, /* X_add_number. */
153 int pcrel
, /* TRUE if PC-relative relocation. */
154 RELOC_ENUM r_type ATTRIBUTE_UNUSED
/* Relocation type. */,
155 int at_beginning
) /* Add to the start of the list? */
161 fixP
= (fixS
*) obstack_alloc (¬es
, sizeof (fixS
));
163 fixP
->fx_frag
= frag
;
164 fixP
->fx_where
= where
;
165 fixP
->fx_size
= size
;
166 /* We've made fx_size a narrow field; check that it's wide enough. */
167 if (fixP
->fx_size
!= size
)
169 as_bad (_("field fx_size too small to hold %d"), size
);
172 fixP
->fx_addsy
= add_symbol
;
173 fixP
->fx_subsy
= sub_symbol
;
174 fixP
->fx_offset
= offset
;
175 fixP
->fx_dot_value
= dot_value
;
176 fixP
->fx_pcrel
= pcrel
;
177 fixP
->fx_r_type
= r_type
;
178 fixP
->fx_im_disp
= 0;
179 fixP
->fx_pcrel_adjust
= 0;
180 fixP
->fx_bit_fixP
= 0;
181 fixP
->fx_addnumber
= 0;
185 fixP
->fx_no_overflow
= 0;
189 fixP
->fx_cgen
.insn
= NULL
;
190 fixP
->fx_cgen
.opinfo
= 0;
194 TC_INIT_FIX_DATA (fixP
);
197 as_where (&fixP
->fx_file
, &fixP
->fx_line
);
201 fixS
**seg_fix_rootP
= (frags_chained
202 ? &seg_info (now_seg
)->fix_root
203 : &frchain_now
->fix_root
);
204 fixS
**seg_fix_tailP
= (frags_chained
205 ? &seg_info (now_seg
)->fix_tail
206 : &frchain_now
->fix_tail
);
210 fixP
->fx_next
= *seg_fix_rootP
;
211 *seg_fix_rootP
= fixP
;
212 if (fixP
->fx_next
== NULL
)
213 *seg_fix_tailP
= fixP
;
217 fixP
->fx_next
= NULL
;
219 (*seg_fix_tailP
)->fx_next
= fixP
;
221 *seg_fix_rootP
= fixP
;
222 *seg_fix_tailP
= fixP
;
229 /* Create a fixup relative to a symbol (plus a constant). */
232 fix_new (fragS
*frag
, /* Which frag? */
233 int where
, /* Where in that frag? */
234 int size
, /* 1, 2, or 4 usually. */
235 symbolS
*add_symbol
, /* X_add_symbol. */
236 offsetT offset
, /* X_add_number. */
237 int pcrel
, /* TRUE if PC-relative relocation. */
238 RELOC_ENUM r_type
/* Relocation type. */)
240 return fix_new_internal (frag
, where
, size
, add_symbol
,
241 (symbolS
*) NULL
, offset
, pcrel
, r_type
, FALSE
);
244 /* Create a fixup for an expression. Currently we only support fixups
245 for difference expressions. That is itself more than most object
246 file formats support anyhow. */
249 fix_new_exp (fragS
*frag
, /* Which frag? */
250 int where
, /* Where in that frag? */
251 int size
, /* 1, 2, or 4 usually. */
252 expressionS
*exp
, /* Expression. */
253 int pcrel
, /* TRUE if PC-relative relocation. */
254 RELOC_ENUM r_type
/* Relocation type. */)
266 as_bad (_("register value used as expression"));
270 /* This comes up when _GLOBAL_OFFSET_TABLE_+(.-L0) is read, if
271 the difference expression cannot immediately be reduced. */
273 symbolS
*stmp
= make_expr_symbol (exp
);
275 exp
->X_op
= O_symbol
;
276 exp
->X_op_symbol
= 0;
277 exp
->X_add_symbol
= stmp
;
278 exp
->X_add_number
= 0;
280 return fix_new_exp (frag
, where
, size
, exp
, pcrel
, r_type
);
284 add
= exp
->X_add_symbol
;
285 off
= exp
->X_add_number
;
286 r_type
= BFD_RELOC_RVA
;
290 sub
= exp
->X_add_symbol
;
291 off
= exp
->X_add_number
;
295 sub
= exp
->X_op_symbol
;
298 add
= exp
->X_add_symbol
;
301 off
= exp
->X_add_number
;
305 add
= make_expr_symbol (exp
);
309 return fix_new_internal (frag
, where
, size
, add
, sub
, off
, pcrel
,
313 /* Create a fixup at the beginning of FRAG. The arguments are the same
314 as for fix_new, except that WHERE is implicitly 0. */
317 fix_at_start (fragS
*frag
, int size
, symbolS
*add_symbol
,
318 offsetT offset
, int pcrel
, RELOC_ENUM r_type
)
320 return fix_new_internal (frag
, 0, size
, add_symbol
,
321 (symbolS
*) NULL
, offset
, pcrel
, r_type
, TRUE
);
324 /* Generic function to determine whether a fixup requires a relocation. */
326 generic_force_reloc (fixS
*fix
)
328 if (fix
->fx_r_type
== BFD_RELOC_VTABLE_INHERIT
329 || fix
->fx_r_type
== BFD_RELOC_VTABLE_ENTRY
)
332 if (fix
->fx_addsy
== NULL
)
335 return S_FORCE_RELOC (fix
->fx_addsy
, fix
->fx_subsy
== NULL
);
338 /* Append a string onto another string, bumping the pointer along. */
340 append (char **charPP
, char *fromP
, unsigned long length
)
342 /* Don't trust memcpy() of 0 chars. */
346 memcpy (*charPP
, fromP
, length
);
350 /* This routine records the largest alignment seen for each segment.
351 If the beginning of the segment is aligned on the worst-case
352 boundary, all of the other alignments within it will work. At
353 least one object format really uses this info. */
356 record_alignment (/* Segment to which alignment pertains. */
358 /* Alignment, as a power of 2 (e.g., 1 => 2-byte
359 boundary, 2 => 4-byte boundary, etc.) */
362 if (seg
== absolute_section
)
365 if ((unsigned int) align
> bfd_get_section_alignment (stdoutput
, seg
))
366 bfd_set_section_alignment (stdoutput
, seg
, align
);
370 get_recorded_alignment (segT seg
)
372 if (seg
== absolute_section
)
375 return bfd_get_section_alignment (stdoutput
, seg
);
378 /* Reset the section indices after removing the gas created sections. */
381 renumber_sections (bfd
*abfd ATTRIBUTE_UNUSED
, asection
*sec
, void *countparg
)
383 int *countp
= (int *) countparg
;
385 sec
->index
= *countp
;
390 chain_frchains_together_1 (segT section
, struct frchain
*frchp
)
392 fragS dummy
, *prev_frag
= &dummy
;
393 fixS fix_dummy
, *prev_fix
= &fix_dummy
;
395 for (; frchp
; frchp
= frchp
->frch_next
)
397 prev_frag
->fr_next
= frchp
->frch_root
;
398 prev_frag
= frchp
->frch_last
;
399 gas_assert (prev_frag
->fr_type
!= 0);
400 if (frchp
->fix_root
!= (fixS
*) NULL
)
402 if (seg_info (section
)->fix_root
== (fixS
*) NULL
)
403 seg_info (section
)->fix_root
= frchp
->fix_root
;
404 prev_fix
->fx_next
= frchp
->fix_root
;
405 seg_info (section
)->fix_tail
= frchp
->fix_tail
;
406 prev_fix
= frchp
->fix_tail
;
409 gas_assert (prev_frag
->fr_type
!= 0);
410 gas_assert (prev_frag
!= &dummy
);
411 prev_frag
->fr_next
= 0;
416 chain_frchains_together (bfd
*abfd ATTRIBUTE_UNUSED
,
418 void *xxx ATTRIBUTE_UNUSED
)
420 segment_info_type
*info
;
422 /* BFD may have introduced its own sections without using
423 subseg_new, so it is possible that seg_info is NULL. */
424 info
= seg_info (section
);
425 if (info
!= (segment_info_type
*) NULL
)
426 info
->frchainP
->frch_last
427 = chain_frchains_together_1 (section
, info
->frchainP
);
429 /* Now that we've chained the frags together, we must add new fixups
430 to the segment, not to the frag chain. */
435 cvt_frag_to_fill (segT sec ATTRIBUTE_UNUSED
, fragS
*fragP
)
437 switch (fragP
->fr_type
)
445 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 backwards? (%ld)"),
455 (long) fragP
->fr_offset
);
456 fragP
->fr_offset
= 0;
458 fragP
->fr_type
= rs_fill
;
466 valueT value
= S_GET_VALUE (fragP
->fr_symbol
);
469 size
= output_leb128 (fragP
->fr_literal
+ fragP
->fr_fix
, value
,
472 fragP
->fr_fix
+= size
;
473 fragP
->fr_type
= rs_fill
;
475 fragP
->fr_offset
= 0;
476 fragP
->fr_symbol
= NULL
;
481 eh_frame_convert_frag (fragP
);
485 dwarf2dbg_convert_frag (fragP
);
488 case rs_machine_dependent
:
489 md_convert_frag (stdoutput
, sec
, fragP
);
491 gas_assert (fragP
->fr_next
== NULL
492 || ((offsetT
) (fragP
->fr_next
->fr_address
- fragP
->fr_address
)
495 /* After md_convert_frag, we make the frag into a ".space 0".
496 md_convert_frag() should set up any fixSs and constants
501 #ifndef WORKING_DOT_WORD
504 struct broken_word
*lie
;
506 if (fragP
->fr_subtype
)
508 fragP
->fr_fix
+= md_short_jump_size
;
509 for (lie
= (struct broken_word
*) (fragP
->fr_symbol
);
510 lie
&& lie
->dispfrag
== fragP
;
511 lie
= lie
->next_broken_word
)
513 fragP
->fr_fix
+= md_long_jump_size
;
521 BAD_CASE (fragP
->fr_type
);
525 md_frag_check (fragP
);
529 struct relax_seg_info
536 relax_seg (bfd
*abfd ATTRIBUTE_UNUSED
, asection
*sec
, void *xxx
)
538 segment_info_type
*seginfo
= seg_info (sec
);
539 struct relax_seg_info
*info
= (struct relax_seg_info
*) xxx
;
541 if (seginfo
&& seginfo
->frchainP
542 && relax_segment (seginfo
->frchainP
->frch_root
, sec
, info
->pass
))
547 size_seg (bfd
*abfd
, asection
*sec
, void *xxx ATTRIBUTE_UNUSED
)
551 segment_info_type
*seginfo
;
553 valueT size
, newsize
;
555 subseg_change (sec
, 0);
557 seginfo
= seg_info (sec
);
558 if (seginfo
&& seginfo
->frchainP
)
560 for (fragp
= seginfo
->frchainP
->frch_root
; fragp
; fragp
= fragp
->fr_next
)
561 cvt_frag_to_fill (sec
, fragp
);
562 for (fragp
= seginfo
->frchainP
->frch_root
;
564 fragp
= fragp
->fr_next
)
565 /* Walk to last elt. */
567 size
= fragp
->fr_address
+ fragp
->fr_fix
;
572 flags
= bfd_get_section_flags (abfd
, sec
);
573 if (size
== 0 && bfd_get_section_size (sec
) != 0 &&
574 (flags
& SEC_HAS_CONTENTS
) != 0)
577 if (size
> 0 && ! seginfo
->bss
)
578 flags
|= SEC_HAS_CONTENTS
;
581 x
= bfd_set_section_flags (abfd
, sec
, flags
);
584 newsize
= md_section_align (sec
, size
);
585 x
= bfd_set_section_size (abfd
, sec
, newsize
);
588 /* If the size had to be rounded up, add some padding in the last
590 gas_assert (newsize
>= size
);
593 fragS
*last
= seginfo
->frchainP
->frch_last
;
594 fragp
= seginfo
->frchainP
->frch_root
;
595 while (fragp
->fr_next
!= last
)
596 fragp
= fragp
->fr_next
;
597 last
->fr_address
= size
;
598 if ((newsize
- size
) % fragp
->fr_var
== 0)
599 fragp
->fr_offset
+= (newsize
- size
) / fragp
->fr_var
;
601 /* If we hit this abort, it's likely due to subsegs_finish not
602 providing sufficient alignment on the last frag, and the
603 machine dependent code using alignment frags with fr_var
608 #ifdef tc_frob_section
609 tc_frob_section (sec
);
611 #ifdef obj_frob_section
612 obj_frob_section (sec
);
618 dump_section_relocs (bfd
*abfd ATTRIBUTE_UNUSED
, asection
*sec
, FILE *stream
)
620 segment_info_type
*seginfo
= seg_info (sec
);
621 fixS
*fixp
= seginfo
->fix_root
;
626 fprintf (stream
, "sec %s relocs:\n", sec
->name
);
629 symbolS
*s
= fixp
->fx_addsy
;
631 fprintf (stream
, " %08lx: type %d ", (unsigned long) fixp
,
632 (int) fixp
->fx_r_type
);
634 fprintf (stream
, "no sym\n");
637 print_symbol_value_1 (stream
, s
);
638 fprintf (stream
, "\n");
640 fixp
= fixp
->fx_next
;
644 #define dump_section_relocs(ABFD,SEC,STREAM) ((void) 0)
647 #ifndef EMIT_SECTION_SYMBOLS
648 #define EMIT_SECTION_SYMBOLS 1
651 /* Resolve U.A.OFFSET_SYM and U.A.SYM fields of RELOC_LIST entries,
652 and check for validity. Convert RELOC_LIST from using U.A fields
655 resolve_reloc_expr_symbols (void)
657 struct reloc_list
*r
;
659 for (r
= reloc_list
; r
; r
= r
->next
)
663 bfd_vma offset
, addend
;
665 reloc_howto_type
*howto
;
667 resolve_symbol_value (r
->u
.a
.offset_sym
);
668 symval
= symbol_get_value_expression (r
->u
.a
.offset_sym
);
672 if (symval
->X_op
== O_constant
)
673 sym
= r
->u
.a
.offset_sym
;
674 else if (symval
->X_op
== O_symbol
)
676 sym
= symval
->X_add_symbol
;
677 offset
= symval
->X_add_number
;
678 symval
= symbol_get_value_expression (symval
->X_add_symbol
);
681 || symval
->X_op
!= O_constant
682 || (sec
= S_GET_SEGMENT (sym
)) == NULL
683 || !SEG_NORMAL (sec
))
685 as_bad_where (r
->file
, r
->line
, _("invalid offset expression"));
689 offset
+= S_GET_VALUE (sym
);
692 addend
= r
->u
.a
.addend
;
693 if (r
->u
.a
.sym
!= NULL
)
695 resolve_symbol_value (r
->u
.a
.sym
);
696 symval
= symbol_get_value_expression (r
->u
.a
.sym
);
697 if (symval
->X_op
== O_constant
)
699 else if (symval
->X_op
== O_symbol
)
701 sym
= symval
->X_add_symbol
;
702 addend
+= symval
->X_add_number
;
703 symval
= symbol_get_value_expression (symval
->X_add_symbol
);
705 if (symval
->X_op
!= O_constant
)
707 as_bad_where (r
->file
, r
->line
, _("invalid reloc expression"));
710 else if (sym
!= NULL
)
711 symbol_mark_used_in_reloc (sym
);
715 if (abs_section_sym
== NULL
)
716 abs_section_sym
= section_symbol (absolute_section
);
717 sym
= abs_section_sym
;
720 howto
= r
->u
.a
.howto
;
723 r
->u
.b
.s
= symbol_get_bfdsym (sym
);
724 r
->u
.b
.r
.sym_ptr_ptr
= &r
->u
.b
.s
;
725 r
->u
.b
.r
.address
= offset
;
726 r
->u
.b
.r
.addend
= addend
;
727 r
->u
.b
.r
.howto
= howto
;
731 /* This pass over fixups decides whether symbols can be replaced with
735 adjust_reloc_syms (bfd
*abfd ATTRIBUTE_UNUSED
,
737 void *xxx ATTRIBUTE_UNUSED
)
739 segment_info_type
*seginfo
= seg_info (sec
);
745 dump_section_relocs (abfd
, sec
, stderr
);
747 for (fixp
= seginfo
->fix_root
; fixp
; fixp
= fixp
->fx_next
)
751 else if (fixp
->fx_addsy
)
757 fprintf (stderr
, "\n\nadjusting fixup:\n");
761 sym
= fixp
->fx_addsy
;
763 /* All symbols should have already been resolved at this
764 point. It is possible to see unresolved expression
765 symbols, though, since they are not in the regular symbol
767 resolve_symbol_value (sym
);
769 if (fixp
->fx_subsy
!= NULL
)
770 resolve_symbol_value (fixp
->fx_subsy
);
772 /* If this symbol is equated to an undefined or common symbol,
773 convert the fixup to being against that symbol. */
774 while (symbol_equated_reloc_p (sym
)
775 || S_IS_WEAKREFR (sym
))
777 symbolS
*newsym
= symbol_get_value_expression (sym
)->X_add_symbol
;
780 fixp
->fx_offset
+= symbol_get_value_expression (sym
)->X_add_number
;
781 fixp
->fx_addsy
= newsym
;
785 if (symbol_mri_common_p (sym
))
787 fixp
->fx_offset
+= S_GET_VALUE (sym
);
788 fixp
->fx_addsy
= symbol_get_value_expression (sym
)->X_add_symbol
;
792 /* If the symbol is undefined, common, weak, or global (ELF
793 shared libs), we can't replace it with the section symbol. */
794 if (S_FORCE_RELOC (fixp
->fx_addsy
, 1))
797 /* Is there some other (target cpu dependent) reason we can't adjust
798 this one? (E.g. relocations involving function addresses on
800 #ifdef tc_fix_adjustable
801 if (! tc_fix_adjustable (fixp
))
805 /* Since we're reducing to section symbols, don't attempt to reduce
806 anything that's already using one. */
807 if (symbol_section_p (sym
))
810 symsec
= S_GET_SEGMENT (sym
);
814 if (bfd_is_abs_section (symsec
))
816 /* The fixup_segment routine normally will not use this
817 symbol in a relocation. */
821 /* Don't try to reduce relocs which refer to non-local symbols
822 in .linkonce sections. It can lead to confusion when a
823 debugging section refers to a .linkonce section. I hope
824 this will always be correct. */
825 if (symsec
!= sec
&& ! S_IS_LOCAL (sym
))
827 if ((symsec
->flags
& SEC_LINK_ONCE
) != 0
829 /* The GNU toolchain uses an extension for ELF: a
830 section beginning with the magic string
831 .gnu.linkonce is a linkonce section. */
832 && strncmp (segment_name (symsec
), ".gnu.linkonce",
833 sizeof ".gnu.linkonce" - 1) == 0))
837 /* Never adjust a reloc against local symbol in a merge section
838 with non-zero addend. */
839 if ((symsec
->flags
& SEC_MERGE
) != 0
840 && (fixp
->fx_offset
!= 0 || fixp
->fx_subsy
!= NULL
))
843 /* Never adjust a reloc against TLS local symbol. */
844 if ((symsec
->flags
& SEC_THREAD_LOCAL
) != 0)
847 /* We refetch the segment when calling section_symbol, rather
848 than using symsec, because S_GET_VALUE may wind up changing
849 the section when it calls resolve_symbol_value. */
850 fixp
->fx_offset
+= S_GET_VALUE (sym
);
851 fixp
->fx_addsy
= section_symbol (S_GET_SEGMENT (sym
));
853 fprintf (stderr
, "\nadjusted fixup:\n");
858 dump_section_relocs (abfd
, sec
, stderr
);
863 Go through all the fixS's in a segment and see which ones can be
864 handled now. (These consist of fixS where we have since discovered
865 the value of a symbol, or the address of the frag involved.)
866 For each one, call md_apply_fix to put the fix into the frag data.
868 Result is a count of how many relocation structs will be needed to
869 handle the remaining fixS's that we couldn't completely handle here.
870 These will be output later by emit_relocations(). */
873 fixup_segment (fixS
*fixP
, segT this_segment
)
875 long seg_reloc_count
= 0;
878 segT add_symbol_segment
= absolute_section
;
880 if (fixP
!= NULL
&& abs_section_sym
== NULL
)
881 abs_section_sym
= section_symbol (absolute_section
);
883 /* If the linker is doing the relaxing, we must not do any fixups.
885 Well, strictly speaking that's not true -- we could do any that
886 are PC-relative and don't cross regions that could change size.
887 And for the i960 we might be able to turn callx/callj into bal
888 anyways in cases where we know the maximum displacement. */
889 if (linkrelax
&& TC_LINKRELAX_FIXUP (this_segment
))
891 for (; fixP
; fixP
= fixP
->fx_next
)
894 if (fixP
->fx_addsy
== NULL
)
896 /* There was no symbol required by this relocation.
897 However, BFD doesn't really handle relocations
898 without symbols well. So fake up a local symbol in
899 the absolute section. */
900 fixP
->fx_addsy
= abs_section_sym
;
902 symbol_mark_used_in_reloc (fixP
->fx_addsy
);
903 if (fixP
->fx_subsy
!= NULL
)
904 symbol_mark_used_in_reloc (fixP
->fx_subsy
);
907 TC_ADJUST_RELOC_COUNT (fixP
, seg_reloc_count
);
908 return seg_reloc_count
;
911 for (; fixP
; fixP
= fixP
->fx_next
)
914 fprintf (stderr
, "\nprocessing fixup:\n");
918 fragP
= fixP
->fx_frag
;
920 #ifdef TC_VALIDATE_FIX
921 TC_VALIDATE_FIX (fixP
, this_segment
, skip
);
923 add_number
= fixP
->fx_offset
;
925 if (fixP
->fx_addsy
!= NULL
)
926 add_symbol_segment
= S_GET_SEGMENT (fixP
->fx_addsy
);
928 if (fixP
->fx_subsy
!= NULL
)
930 segT sub_symbol_segment
;
931 resolve_symbol_value (fixP
->fx_subsy
);
932 sub_symbol_segment
= S_GET_SEGMENT (fixP
->fx_subsy
);
933 if (fixP
->fx_addsy
!= NULL
934 && sub_symbol_segment
== add_symbol_segment
935 && !S_FORCE_RELOC (fixP
->fx_addsy
, 0)
936 && !S_FORCE_RELOC (fixP
->fx_subsy
, 0)
937 && !TC_FORCE_RELOCATION_SUB_SAME (fixP
, add_symbol_segment
))
939 add_number
+= S_GET_VALUE (fixP
->fx_addsy
);
940 add_number
-= S_GET_VALUE (fixP
->fx_subsy
);
941 fixP
->fx_offset
= add_number
;
942 fixP
->fx_addsy
= NULL
;
943 fixP
->fx_subsy
= NULL
;
945 /* See the comment below about 68k weirdness. */
949 else if (sub_symbol_segment
== absolute_section
950 && !S_FORCE_RELOC (fixP
->fx_subsy
, 0)
951 && !TC_FORCE_RELOCATION_SUB_ABS (fixP
, add_symbol_segment
))
953 add_number
-= S_GET_VALUE (fixP
->fx_subsy
);
954 fixP
->fx_offset
= add_number
;
955 fixP
->fx_subsy
= NULL
;
957 else if (sub_symbol_segment
== this_segment
958 && !S_FORCE_RELOC (fixP
->fx_subsy
, 0)
959 && !TC_FORCE_RELOCATION_SUB_LOCAL (fixP
, add_symbol_segment
))
961 add_number
-= S_GET_VALUE (fixP
->fx_subsy
);
962 fixP
->fx_offset
= (add_number
+ fixP
->fx_dot_value
963 + fixP
->fx_frag
->fr_address
);
965 /* Make it pc-relative. If the back-end code has not
966 selected a pc-relative reloc, cancel the adjustment
967 we do later on all pc-relative relocs. */
970 /* Do this for m68k even if it's already described
971 as pc-relative. On the m68k, an operand of
972 "pc@(foo-.-2)" should address "foo" in a
977 add_number
+= MD_PCREL_FROM_SECTION (fixP
, this_segment
);
978 fixP
->fx_subsy
= NULL
;
981 else if (!TC_VALIDATE_FIX_SUB (fixP
, add_symbol_segment
))
983 if (!md_register_arithmetic
984 && (add_symbol_segment
== reg_section
985 || sub_symbol_segment
== reg_section
))
986 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
987 _("register value used as expression"));
989 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
990 _("can't resolve `%s' {%s section} - `%s' {%s section}"),
991 fixP
->fx_addsy
? S_GET_NAME (fixP
->fx_addsy
) : "0",
992 segment_name (add_symbol_segment
),
993 S_GET_NAME (fixP
->fx_subsy
),
994 segment_name (sub_symbol_segment
));
1000 if (add_symbol_segment
== this_segment
1001 && !S_FORCE_RELOC (fixP
->fx_addsy
, 0)
1002 && !TC_FORCE_RELOCATION_LOCAL (fixP
))
1004 /* This fixup was made when the symbol's segment was
1005 SEG_UNKNOWN, but it is now in the local segment.
1006 So we know how to do the address without relocation. */
1007 add_number
+= S_GET_VALUE (fixP
->fx_addsy
);
1008 fixP
->fx_offset
= add_number
;
1010 add_number
-= MD_PCREL_FROM_SECTION (fixP
, this_segment
);
1011 fixP
->fx_addsy
= NULL
;
1014 else if (add_symbol_segment
== absolute_section
1015 && !S_FORCE_RELOC (fixP
->fx_addsy
, 0)
1016 && !TC_FORCE_RELOCATION_ABS (fixP
))
1018 add_number
+= S_GET_VALUE (fixP
->fx_addsy
);
1019 fixP
->fx_offset
= add_number
;
1020 fixP
->fx_addsy
= NULL
;
1022 else if (add_symbol_segment
!= undefined_section
1023 && ! bfd_is_com_section (add_symbol_segment
)
1024 && MD_APPLY_SYM_VALUE (fixP
))
1025 add_number
+= S_GET_VALUE (fixP
->fx_addsy
);
1030 add_number
-= MD_PCREL_FROM_SECTION (fixP
, this_segment
);
1031 if (!fixP
->fx_done
&& fixP
->fx_addsy
== NULL
)
1033 /* There was no symbol required by this relocation.
1034 However, BFD doesn't really handle relocations
1035 without symbols well. So fake up a local symbol in
1036 the absolute section. */
1037 fixP
->fx_addsy
= abs_section_sym
;
1042 md_apply_fix (fixP
, &add_number
, this_segment
);
1047 if (fixP
->fx_addsy
== NULL
)
1048 fixP
->fx_addsy
= abs_section_sym
;
1049 symbol_mark_used_in_reloc (fixP
->fx_addsy
);
1050 if (fixP
->fx_subsy
!= NULL
)
1051 symbol_mark_used_in_reloc (fixP
->fx_subsy
);
1054 if (!fixP
->fx_bit_fixP
&& !fixP
->fx_no_overflow
&& fixP
->fx_size
!= 0)
1056 if (fixP
->fx_size
< sizeof (valueT
))
1061 mask
--; /* Set all bits to one. */
1062 mask
<<= fixP
->fx_size
* 8 - (fixP
->fx_signed
? 1 : 0);
1063 if ((add_number
& mask
) != 0 && (add_number
& mask
) != mask
)
1065 char buf
[50], buf2
[50];
1066 sprint_value (buf
, fragP
->fr_address
+ fixP
->fx_where
);
1067 if (add_number
> 1000)
1068 sprint_value (buf2
, add_number
);
1070 sprintf (buf2
, "%ld", (long) add_number
);
1071 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1072 _("value of %s too large for field of %d bytes at %s"),
1073 buf2
, fixP
->fx_size
, buf
);
1074 } /* Generic error checking. */
1076 #ifdef WARN_SIGNED_OVERFLOW_WORD
1077 /* Warn if a .word value is too large when treated as a signed
1078 number. We already know it is not too negative. This is to
1079 catch over-large switches generated by gcc on the 68k. */
1080 if (!flag_signed_overflow_ok
1081 && fixP
->fx_size
== 2
1082 && add_number
> 0x7fff)
1083 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1084 _("signed .word overflow; switch may be too large; %ld at 0x%lx"),
1086 (long) (fragP
->fr_address
+ fixP
->fx_where
));
1088 } /* Not a bit fix. */
1090 #ifdef TC_VALIDATE_FIX
1091 skip
: ATTRIBUTE_UNUSED_LABEL
1095 fprintf (stderr
, "result:\n");
1098 } /* For each fixS in this segment. */
1100 TC_ADJUST_RELOC_COUNT (fixP
, seg_reloc_count
);
1101 return seg_reloc_count
;
1105 fix_segment (bfd
*abfd ATTRIBUTE_UNUSED
,
1107 void *xxx ATTRIBUTE_UNUSED
)
1109 segment_info_type
*seginfo
= seg_info (sec
);
1111 fixup_segment (seginfo
->fix_root
, sec
);
1115 install_reloc (asection
*sec
, arelent
*reloc
, fragS
*fragp
,
1116 char *file
, unsigned int line
)
1119 bfd_reloc_status_type s
;
1122 if (reloc
->sym_ptr_ptr
!= NULL
1123 && (sym
= *reloc
->sym_ptr_ptr
) != NULL
1124 && (sym
->flags
& BSF_KEEP
) == 0
1125 && ((sym
->flags
& BSF_SECTION_SYM
) == 0
1126 || (EMIT_SECTION_SYMBOLS
1127 && !bfd_is_abs_section (sym
->section
))))
1128 as_bad_where (file
, line
, _("redefined symbol cannot be used on reloc"));
1130 s
= bfd_install_relocation (stdoutput
, reloc
,
1131 fragp
->fr_literal
, fragp
->fr_address
,
1137 case bfd_reloc_overflow
:
1138 as_bad_where (file
, line
, _("relocation overflow"));
1140 case bfd_reloc_outofrange
:
1141 as_bad_where (file
, line
, _("relocation out of range"));
1144 as_fatal (_("%s:%u: bad return from bfd_install_relocation: %x"),
1150 write_relocs (bfd
*abfd
, asection
*sec
, void *xxx ATTRIBUTE_UNUSED
)
1152 segment_info_type
*seginfo
= seg_info (sec
);
1155 struct reloc_list
*my_reloc_list
, **rp
, *r
;
1159 /* If seginfo is NULL, we did not create this section; don't do
1160 anything with it. */
1161 if (seginfo
== NULL
)
1165 for (fixp
= seginfo
->fix_root
; fixp
; fixp
= fixp
->fx_next
)
1169 #ifdef RELOC_EXPANSION_POSSIBLE
1170 n
*= MAX_RELOC_EXPANSION
;
1173 /* Extract relocs for this section from reloc_list. */
1175 my_reloc_list
= NULL
;
1176 while ((r
= *rp
) != NULL
)
1178 if (r
->u
.b
.sec
== sec
)
1181 r
->next
= my_reloc_list
;
1189 relocs
= (arelent
**) xcalloc (n
, sizeof (arelent
*));
1192 for (fixp
= seginfo
->fix_root
; fixp
!= (fixS
*) NULL
; fixp
= fixp
->fx_next
)
1201 fx_size
= fixp
->fx_size
;
1202 slack
= TC_FX_SIZE_SLACK (fixp
);
1204 fx_size
= fx_size
> slack
? fx_size
- slack
: 0;
1205 loc
= fixp
->fx_where
+ fx_size
;
1206 if (slack
>= 0 && loc
> fixp
->fx_frag
->fr_fix
)
1207 as_bad_where (fixp
->fx_file
, fixp
->fx_line
,
1208 _("internal error: fixup not contained within frag"));
1210 #ifndef RELOC_EXPANSION_POSSIBLE
1212 arelent
*reloc
= tc_gen_reloc (sec
, fixp
);
1216 relocs
[i
++] = reloc
;
1221 arelent
**reloc
= tc_gen_reloc (sec
, fixp
);
1223 for (j
= 0; reloc
[j
]; j
++)
1224 relocs
[i
++] = reloc
[j
];
1228 for ( ; j
!= 0; --j
)
1229 install_reloc (sec
, relocs
[i
- j
], fixp
->fx_frag
,
1230 fixp
->fx_file
, fixp
->fx_line
);
1236 unsigned int k
, j
, nsyms
;
1238 sympp
= bfd_get_outsymbols (stdoutput
);
1239 nsyms
= bfd_get_symcount (stdoutput
);
1240 for (k
= 0; k
< n
; k
++)
1241 if (((*relocs
[k
]->sym_ptr_ptr
)->flags
& BSF_SECTION_SYM
) == 0)
1243 for (j
= 0; j
< nsyms
; j
++)
1244 if (sympp
[j
] == *relocs
[k
]->sym_ptr_ptr
)
1252 for (r
= my_reloc_list
; r
!= NULL
; r
= r
->next
)
1255 for (f
= seginfo
->frchainP
->frch_root
; f
; f
= f
->fr_next
)
1256 if (f
->fr_address
<= r
->u
.b
.r
.address
1257 && r
->u
.b
.r
.address
< f
->fr_address
+ f
->fr_fix
)
1260 as_bad_where (r
->file
, r
->line
,
1261 _("reloc not within (fixed part of) section"));
1264 relocs
[n
++] = &r
->u
.b
.r
;
1265 install_reloc (sec
, &r
->u
.b
.r
, f
, r
->file
, r
->line
);
1271 flagword flags
= bfd_get_section_flags (abfd
, sec
);
1273 bfd_set_section_flags (abfd
, sec
, flags
);
1274 bfd_set_reloc (stdoutput
, sec
, relocs
, n
);
1277 #ifdef SET_SECTION_RELOCS
1278 SET_SECTION_RELOCS (sec
, relocs
, n
);
1285 fprintf (stderr
, "relocs for sec %s\n", sec
->name
);
1286 for (k
= 0; k
< n
; k
++)
1288 arelent
*rel
= relocs
[k
];
1289 asymbol
*s
= *rel
->sym_ptr_ptr
;
1290 fprintf (stderr
, " reloc %2d @%p off %4lx : sym %-10s addend %lx\n",
1291 k
, rel
, (unsigned long)rel
->address
, s
->name
,
1292 (unsigned long)rel
->addend
);
1299 compress_frag (struct z_stream_s
*strm
, const char *contents
, int in_size
,
1300 fragS
**last_newf
, struct obstack
*ob
)
1303 int total_out_size
= 0;
1304 fragS
*f
= *last_newf
;
1308 /* Call the compression routine repeatedly until it has finished
1309 processing the frag. */
1312 /* Reserve all the space available in the current chunk.
1313 If none is available, start a new frag. */
1314 avail_out
= obstack_room (ob
);
1317 obstack_finish (ob
);
1318 f
= frag_alloc (ob
);
1319 f
->fr_type
= rs_fill
;
1320 (*last_newf
)->fr_next
= f
;
1322 avail_out
= obstack_room (ob
);
1325 as_fatal (_("can't extend frag"));
1326 next_out
= obstack_next_free (ob
);
1327 obstack_blank_fast (ob
, avail_out
);
1328 out_size
= compress_data (strm
, &contents
, &in_size
,
1329 &next_out
, &avail_out
);
1333 f
->fr_fix
+= out_size
;
1334 total_out_size
+= out_size
;
1336 /* Return unused space. */
1338 obstack_blank_fast (ob
, -avail_out
);
1341 return total_out_size
;
1345 compress_debug (bfd
*abfd
, asection
*sec
, void *xxx ATTRIBUTE_UNUSED
)
1347 segment_info_type
*seginfo
= seg_info (sec
);
1351 struct obstack
*ob
= &seginfo
->frchainP
->frch_obstack
;
1352 bfd_size_type uncompressed_size
= (bfd_size_type
) sec
->size
;
1353 bfd_size_type compressed_size
;
1354 const char *section_name
;
1355 char *compressed_name
;
1357 struct z_stream_s
*strm
;
1359 flagword flags
= bfd_get_section_flags (abfd
, sec
);
1363 || (flags
& (SEC_ALLOC
| SEC_HAS_CONTENTS
)) == SEC_ALLOC
)
1366 section_name
= bfd_get_section_name (stdoutput
, sec
);
1367 if (strncmp (section_name
, ".debug_", 7) != 0)
1370 strm
= compress_init ();
1374 /* Create a new frag to contain the "ZLIB" header. */
1375 first_newf
= frag_alloc (ob
);
1376 if (obstack_room (ob
) < 12)
1377 first_newf
= frag_alloc (ob
);
1378 if (obstack_room (ob
) < 12)
1379 as_fatal (_("can't extend frag %u chars"), 12);
1380 last_newf
= first_newf
;
1381 obstack_blank_fast (ob
, 12);
1382 last_newf
->fr_type
= rs_fill
;
1383 last_newf
->fr_fix
= 12;
1384 header
= last_newf
->fr_literal
;
1385 memcpy (header
, "ZLIB", 4);
1386 header
[11] = uncompressed_size
; uncompressed_size
>>= 8;
1387 header
[10] = uncompressed_size
; uncompressed_size
>>= 8;
1388 header
[9] = uncompressed_size
; uncompressed_size
>>= 8;
1389 header
[8] = uncompressed_size
; uncompressed_size
>>= 8;
1390 header
[7] = uncompressed_size
; uncompressed_size
>>= 8;
1391 header
[6] = uncompressed_size
; uncompressed_size
>>= 8;
1392 header
[5] = uncompressed_size
; uncompressed_size
>>= 8;
1393 header
[4] = uncompressed_size
;
1394 compressed_size
= 12;
1396 /* Stream the frags through the compression engine, adding new frags
1397 as necessary to accomodate the compressed output. */
1398 for (f
= seginfo
->frchainP
->frch_root
;
1407 gas_assert (f
->fr_type
== rs_fill
);
1410 out_size
= compress_frag (strm
, f
->fr_literal
, f
->fr_fix
,
1414 compressed_size
+= out_size
;
1416 fill_literal
= f
->fr_literal
+ f
->fr_fix
;
1417 fill_size
= f
->fr_var
;
1418 count
= f
->fr_offset
;
1419 gas_assert (count
>= 0);
1420 if (fill_size
&& count
)
1424 out_size
= compress_frag (strm
, fill_literal
, (int) fill_size
,
1428 compressed_size
+= out_size
;
1433 /* Flush the compression state. */
1440 /* Reserve all the space available in the current chunk.
1441 If none is available, start a new frag. */
1442 avail_out
= obstack_room (ob
);
1447 obstack_finish (ob
);
1448 newf
= frag_alloc (ob
);
1449 newf
->fr_type
= rs_fill
;
1450 last_newf
->fr_next
= newf
;
1452 avail_out
= obstack_room (ob
);
1455 as_fatal (_("can't extend frag"));
1456 next_out
= obstack_next_free (ob
);
1457 obstack_blank_fast (ob
, avail_out
);
1458 x
= compress_finish (strm
, &next_out
, &avail_out
, &out_size
);
1462 last_newf
->fr_fix
+= out_size
;
1463 compressed_size
+= out_size
;
1465 /* Return unused space. */
1467 obstack_blank_fast (ob
, -avail_out
);
1473 /* Replace the uncompressed frag list with the compressed frag list. */
1474 seginfo
->frchainP
->frch_root
= first_newf
;
1475 seginfo
->frchainP
->frch_last
= last_newf
;
1477 /* Update the section size and its name. */
1478 x
= bfd_set_section_size (abfd
, sec
, compressed_size
);
1480 compressed_name
= (char *) xmalloc (strlen (section_name
) + 2);
1481 compressed_name
[0] = '.';
1482 compressed_name
[1] = 'z';
1483 strcpy (compressed_name
+ 2, section_name
+ 1);
1484 bfd_section_name (stdoutput
, sec
) = compressed_name
;
1488 write_contents (bfd
*abfd ATTRIBUTE_UNUSED
,
1490 void *xxx ATTRIBUTE_UNUSED
)
1492 segment_info_type
*seginfo
= seg_info (sec
);
1493 addressT offset
= 0;
1496 /* Write out the frags. */
1498 || !(bfd_get_section_flags (abfd
, sec
) & SEC_HAS_CONTENTS
))
1501 for (f
= seginfo
->frchainP
->frch_root
;
1510 gas_assert (f
->fr_type
== rs_fill
);
1513 x
= bfd_set_section_contents (stdoutput
, sec
,
1514 f
->fr_literal
, (file_ptr
) offset
,
1515 (bfd_size_type
) f
->fr_fix
);
1517 as_fatal (_("can't write %s: %s"), stdoutput
->filename
,
1518 bfd_errmsg (bfd_get_error ()));
1519 offset
+= f
->fr_fix
;
1521 fill_literal
= f
->fr_literal
+ f
->fr_fix
;
1522 fill_size
= f
->fr_var
;
1523 count
= f
->fr_offset
;
1524 gas_assert (count
>= 0);
1525 if (fill_size
&& count
)
1528 if (fill_size
> sizeof (buf
))
1530 /* Do it the old way. Can this ever happen? */
1533 x
= bfd_set_section_contents (stdoutput
, sec
,
1536 (bfd_size_type
) fill_size
);
1538 as_fatal (_("can't write %s: %s"), stdoutput
->filename
,
1539 bfd_errmsg (bfd_get_error ()));
1540 offset
+= fill_size
;
1545 /* Build a buffer full of fill objects and output it as
1546 often as necessary. This saves on the overhead of
1547 potentially lots of bfd_set_section_contents calls. */
1551 n_per_buf
= sizeof (buf
);
1552 memset (buf
, *fill_literal
, n_per_buf
);
1557 n_per_buf
= sizeof (buf
) / fill_size
;
1558 for (i
= n_per_buf
, bufp
= buf
; i
; i
--, bufp
+= fill_size
)
1559 memcpy (bufp
, fill_literal
, fill_size
);
1561 for (; count
> 0; count
-= n_per_buf
)
1563 n_per_buf
= n_per_buf
> count
? count
: n_per_buf
;
1564 x
= bfd_set_section_contents
1565 (stdoutput
, sec
, buf
, (file_ptr
) offset
,
1566 (bfd_size_type
) n_per_buf
* fill_size
);
1568 as_fatal (_("cannot write to output file '%s': %s"),
1569 stdoutput
->filename
,
1570 bfd_errmsg (bfd_get_error ()));
1571 offset
+= n_per_buf
* fill_size
;
1579 merge_data_into_text (void)
1581 seg_info (text_section
)->frchainP
->frch_last
->fr_next
=
1582 seg_info (data_section
)->frchainP
->frch_root
;
1583 seg_info (text_section
)->frchainP
->frch_last
=
1584 seg_info (data_section
)->frchainP
->frch_last
;
1585 seg_info (data_section
)->frchainP
= 0;
1596 /* Count symbols. We can't rely on a count made by the loop in
1597 write_object_file, because *_frob_file may add a new symbol or
1600 for (symp
= symbol_rootP
; symp
; symp
= symbol_next (symp
))
1606 bfd_size_type amt
= (bfd_size_type
) nsyms
* sizeof (asymbol
*);
1608 asympp
= (asymbol
**) bfd_alloc (stdoutput
, amt
);
1609 symp
= symbol_rootP
;
1610 for (i
= 0; i
< nsyms
; i
++, symp
= symbol_next (symp
))
1612 asympp
[i
] = symbol_get_bfdsym (symp
);
1613 if (asympp
[i
]->flags
!= BSF_SECTION_SYM
1614 || !(bfd_is_const_section (asympp
[i
]->section
)
1615 && asympp
[i
]->section
->symbol
== asympp
[i
]))
1616 asympp
[i
]->flags
|= BSF_KEEP
;
1617 symbol_mark_written (symp
);
1622 result
= bfd_set_symtab (stdoutput
, asympp
, nsyms
);
1623 gas_assert (result
);
1624 symbol_table_frozen
= 1;
1627 /* Finish the subsegments. After every sub-segment, we fake an
1628 ".align ...". This conforms to BSD4.2 brane-damage. We then fake
1629 ".fill 0" because that is the kind of frag that requires least
1630 thought. ".align" frags like to have a following frag since that
1631 makes calculating their intended length trivial. */
1633 #ifndef SUB_SEGMENT_ALIGN
1635 /* The last subsegment gets an alignment corresponding to the alignment
1636 of the section. This allows proper nop-filling at the end of
1637 code-bearing sections. */
1638 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) \
1639 (!(FRCHAIN)->frch_next ? get_recorded_alignment (SEG) : 0)
1641 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) 0
1646 subsegs_finish (void)
1648 struct frchain
*frchainP
;
1651 for (s
= stdoutput
->sections
; s
; s
= s
->next
)
1653 segment_info_type
*seginfo
= seg_info (s
);
1657 for (frchainP
= seginfo
->frchainP
;
1659 frchainP
= frchainP
->frch_next
)
1663 subseg_set (s
, frchainP
->frch_subseg
);
1665 /* This now gets called even if we had errors. In that case,
1666 any alignment is meaningless, and, moreover, will look weird
1667 if we are generating a listing. */
1670 alignment
= SUB_SEGMENT_ALIGN (now_seg
, frchainP
);
1671 if ((bfd_get_section_flags (now_seg
->owner
, now_seg
) & SEC_MERGE
)
1672 && now_seg
->entsize
)
1674 unsigned int entsize
= now_seg
->entsize
;
1677 while ((entsize
& 1) == 0)
1682 if (entalign
> alignment
)
1683 alignment
= entalign
;
1687 if (subseg_text_p (now_seg
))
1688 frag_align_code (alignment
, 0);
1690 frag_align (alignment
, 0, 0);
1692 /* frag_align will have left a new frag.
1693 Use this last frag for an empty ".fill".
1695 For this segment ...
1696 Create a last frag. Do not leave a "being filled in frag". */
1697 frag_wane (frag_now
);
1698 frag_now
->fr_fix
= 0;
1699 know (frag_now
->fr_next
== NULL
);
1704 /* Write the object file. */
1707 write_object_file (void)
1709 struct relax_seg_info rsi
;
1710 #ifndef WORKING_DOT_WORD
1711 fragS
*fragP
; /* Track along all frags. */
1714 /* Do we really want to write it? */
1716 int n_warns
, n_errs
;
1717 n_warns
= had_warnings ();
1718 n_errs
= had_errors ();
1719 /* The -Z flag indicates that an object file should be generated,
1720 regardless of warnings and errors. */
1721 if (flag_always_generate_output
)
1723 if (n_warns
|| n_errs
)
1724 as_warn (_("%d error%s, %d warning%s, generating bad object file"),
1725 n_errs
, n_errs
== 1 ? "" : "s",
1726 n_warns
, n_warns
== 1 ? "" : "s");
1731 as_fatal (_("%d error%s, %d warning%s, no object file generated"),
1732 n_errs
, n_errs
== 1 ? "" : "s",
1733 n_warns
, n_warns
== 1 ? "" : "s");
1737 /* From now on, we don't care about sub-segments. Build one frag chain
1738 for each segment. Linked thru fr_next. */
1740 /* Remove the sections created by gas for its own purposes. */
1744 bfd_section_list_remove (stdoutput
, reg_section
);
1745 bfd_section_list_remove (stdoutput
, expr_section
);
1746 stdoutput
->section_count
-= 2;
1748 bfd_map_over_sections (stdoutput
, renumber_sections
, &i
);
1751 bfd_map_over_sections (stdoutput
, chain_frchains_together
, (char *) 0);
1753 /* We have two segments. If user gave -R flag, then we must put the
1754 data frags into the text segment. Do this before relaxing so
1755 we know to take advantage of -R and make shorter addresses. */
1756 if (flag_readonly_data_in_text
)
1758 merge_data_into_text ();
1764 #ifndef WORKING_DOT_WORD
1765 /* We need to reset the markers in the broken word list and
1766 associated frags between calls to relax_segment (via
1767 relax_seg). Since the broken word list is global, we do it
1768 once per round, rather than locally in relax_segment for each
1770 struct broken_word
*brokp
;
1772 for (brokp
= broken_words
;
1773 brokp
!= (struct broken_word
*) NULL
;
1774 brokp
= brokp
->next_broken_word
)
1778 if (brokp
->dispfrag
!= (fragS
*) NULL
1779 && brokp
->dispfrag
->fr_type
== rs_broken_word
)
1780 brokp
->dispfrag
->fr_subtype
= 0;
1785 bfd_map_over_sections (stdoutput
, relax_seg
, &rsi
);
1791 /* Note - Most ports will use the default value of
1792 TC_FINALIZE_SYMS_BEFORE_SIZE_SEG, which 1. This will force
1793 local symbols to be resolved, removing their frag information.
1794 Some ports however, will not have finished relaxing all of
1795 their frags and will still need the local symbol frag
1796 information. These ports can set
1797 TC_FINALIZE_SYMS_BEFORE_SIZE_SEG to 0. */
1798 finalize_syms
= TC_FINALIZE_SYMS_BEFORE_SIZE_SEG
;
1800 bfd_map_over_sections (stdoutput
, size_seg
, (char *) 0);
1802 /* Relaxation has completed. Freeze all syms. */
1805 #ifdef md_post_relax_hook
1809 #ifndef WORKING_DOT_WORD
1811 struct broken_word
*lie
;
1812 struct broken_word
**prevP
;
1814 prevP
= &broken_words
;
1815 for (lie
= broken_words
; lie
; lie
= lie
->next_broken_word
)
1820 subseg_change (lie
->seg
, lie
->subseg
);
1821 exp
.X_op
= O_subtract
;
1822 exp
.X_add_symbol
= lie
->add
;
1823 exp
.X_op_symbol
= lie
->sub
;
1824 exp
.X_add_number
= lie
->addnum
;
1825 #ifdef TC_CONS_FIX_NEW
1826 TC_CONS_FIX_NEW (lie
->frag
,
1827 lie
->word_goes_here
- lie
->frag
->fr_literal
,
1830 fix_new_exp (lie
->frag
,
1831 lie
->word_goes_here
- lie
->frag
->fr_literal
,
1832 2, &exp
, 0, BFD_RELOC_16
);
1834 *prevP
= lie
->next_broken_word
;
1837 prevP
= &(lie
->next_broken_word
);
1839 for (lie
= broken_words
; lie
;)
1841 struct broken_word
*untruth
;
1843 addressT table_addr
;
1844 addressT from_addr
, to_addr
;
1847 subseg_change (lie
->seg
, lie
->subseg
);
1848 fragP
= lie
->dispfrag
;
1850 /* Find out how many broken_words go here. */
1853 untruth
&& untruth
->dispfrag
== fragP
;
1854 untruth
= untruth
->next_broken_word
)
1855 if (untruth
->added
== 1)
1858 table_ptr
= lie
->dispfrag
->fr_opcode
;
1859 table_addr
= (lie
->dispfrag
->fr_address
1860 + (table_ptr
- lie
->dispfrag
->fr_literal
));
1861 /* Create the jump around the long jumps. This is a short
1862 jump from table_ptr+0 to table_ptr+n*long_jump_size. */
1863 from_addr
= table_addr
;
1864 to_addr
= table_addr
+ md_short_jump_size
+ n
* md_long_jump_size
;
1865 md_create_short_jump (table_ptr
, from_addr
, to_addr
, lie
->dispfrag
,
1867 table_ptr
+= md_short_jump_size
;
1868 table_addr
+= md_short_jump_size
;
1871 lie
&& lie
->dispfrag
== fragP
;
1872 m
++, lie
= lie
->next_broken_word
)
1874 if (lie
->added
== 2)
1876 /* Patch the jump table. */
1877 for (untruth
= (struct broken_word
*) (fragP
->fr_symbol
);
1878 untruth
&& untruth
->dispfrag
== fragP
;
1879 untruth
= untruth
->next_broken_word
)
1881 if (untruth
->use_jump
== lie
)
1883 /* This is the offset from ??? to table_ptr+0.
1884 The target is the same for all users of this
1885 md_long_jump, but the "sub" bases (and hence the
1886 offsets) may be different. */
1887 addressT to_word
= table_addr
- S_GET_VALUE (untruth
->sub
);
1888 #ifdef TC_CHECK_ADJUSTED_BROKEN_DOT_WORD
1889 TC_CHECK_ADJUSTED_BROKEN_DOT_WORD (to_word
, untruth
);
1891 md_number_to_chars (untruth
->word_goes_here
, to_word
, 2);
1895 /* Install the long jump. */
1896 /* This is a long jump from table_ptr+0 to the final target. */
1897 from_addr
= table_addr
;
1898 to_addr
= S_GET_VALUE (lie
->add
) + lie
->addnum
;
1899 md_create_long_jump (table_ptr
, from_addr
, to_addr
, lie
->dispfrag
,
1901 table_ptr
+= md_long_jump_size
;
1902 table_addr
+= md_long_jump_size
;
1906 #endif /* not WORKING_DOT_WORD */
1908 /* Resolve symbol values. This needs to be done before processing
1914 for (symp
= symbol_rootP
; symp
; symp
= symbol_next (symp
))
1915 resolve_symbol_value (symp
);
1917 resolve_local_symbol_values ();
1918 resolve_reloc_expr_symbols ();
1922 #ifdef tc_frob_file_before_adjust
1923 tc_frob_file_before_adjust ();
1925 #ifdef obj_frob_file_before_adjust
1926 obj_frob_file_before_adjust ();
1929 bfd_map_over_sections (stdoutput
, adjust_reloc_syms
, (char *) 0);
1931 #ifdef tc_frob_file_before_fix
1932 tc_frob_file_before_fix ();
1934 #ifdef obj_frob_file_before_fix
1935 obj_frob_file_before_fix ();
1938 bfd_map_over_sections (stdoutput
, fix_segment
, (char *) 0);
1940 /* Set up symbol table, and write it out. */
1944 bfd_boolean skip_next_symbol
= FALSE
;
1946 for (symp
= symbol_rootP
; symp
; symp
= symbol_next (symp
))
1951 if (skip_next_symbol
)
1953 /* Don't do anything besides moving the value of the
1954 symbol from the GAS value-field to the BFD value-field. */
1955 symbol_get_bfdsym (symp
)->value
= S_GET_VALUE (symp
);
1956 skip_next_symbol
= FALSE
;
1960 if (symbol_mri_common_p (symp
))
1962 if (S_IS_EXTERNAL (symp
))
1963 as_bad (_("%s: global symbols not supported in common sections"),
1965 symbol_remove (symp
, &symbol_rootP
, &symbol_lastP
);
1969 name
= S_GET_NAME (symp
);
1973 decode_local_label_name ((char *) S_GET_NAME (symp
));
1974 /* They only differ if `name' is a fb or dollar local
1976 if (name2
!= name
&& ! S_IS_DEFINED (symp
))
1977 as_bad (_("local label `%s' is not defined"), name2
);
1980 /* Do it again, because adjust_reloc_syms might introduce
1981 more symbols. They'll probably only be section symbols,
1982 but they'll still need to have the values computed. */
1983 resolve_symbol_value (symp
);
1985 /* Skip symbols which were equated to undefined or common
1987 if (symbol_equated_reloc_p (symp
)
1988 || S_IS_WEAKREFR (symp
))
1990 const char *sname
= S_GET_NAME (symp
);
1992 if (S_IS_COMMON (symp
)
1993 && !TC_FAKE_LABEL (sname
)
1994 && !S_IS_WEAKREFR (symp
)
1995 && (!S_IS_EXTERNAL (symp
) || S_IS_LOCAL (symp
)))
1997 expressionS
*e
= symbol_get_value_expression (symp
);
1999 as_bad (_("Local symbol `%s' can't be equated to common symbol `%s'"),
2000 sname
, S_GET_NAME (e
->X_add_symbol
));
2002 if (S_GET_SEGMENT (symp
) == reg_section
)
2004 /* Report error only if we know the symbol name. */
2005 if (S_GET_NAME (symp
) != reg_section
->name
)
2006 as_bad (_("can't make global register symbol `%s'"),
2009 symbol_remove (symp
, &symbol_rootP
, &symbol_lastP
);
2013 #ifdef obj_frob_symbol
2014 obj_frob_symbol (symp
, punt
);
2016 #ifdef tc_frob_symbol
2017 if (! punt
|| symbol_used_in_reloc_p (symp
))
2018 tc_frob_symbol (symp
, punt
);
2021 /* If we don't want to keep this symbol, splice it out of
2022 the chain now. If EMIT_SECTION_SYMBOLS is 0, we never
2023 want section symbols. Otherwise, we skip local symbols
2024 and symbols that the frob_symbol macros told us to punt,
2025 but we keep such symbols if they are used in relocs. */
2026 if (symp
== abs_section_sym
2027 || (! EMIT_SECTION_SYMBOLS
2028 && symbol_section_p (symp
))
2029 /* Note that S_IS_EXTERNAL and S_IS_LOCAL are not always
2030 opposites. Sometimes the former checks flags and the
2031 latter examines the name... */
2032 || (!S_IS_EXTERNAL (symp
)
2033 && (punt
|| S_IS_LOCAL (symp
) ||
2034 (S_IS_WEAKREFD (symp
) && ! symbol_used_p (symp
)))
2035 && ! symbol_used_in_reloc_p (symp
)))
2037 symbol_remove (symp
, &symbol_rootP
, &symbol_lastP
);
2039 /* After symbol_remove, symbol_next(symp) still returns
2040 the one that came after it in the chain. So we don't
2041 need to do any extra cleanup work here. */
2045 /* Make sure we really got a value for the symbol. */
2046 if (! symbol_resolved_p (symp
))
2048 as_bad (_("can't resolve value for symbol `%s'"),
2050 symbol_mark_resolved (symp
);
2053 /* Set the value into the BFD symbol. Up til now the value
2054 has only been kept in the gas symbolS struct. */
2055 symbol_get_bfdsym (symp
)->value
= S_GET_VALUE (symp
);
2057 /* A warning construct is a warning symbol followed by the
2058 symbol warned about. Don't let anything object-format or
2059 target-specific muck with it; it's ready for output. */
2060 if (symbol_get_bfdsym (symp
)->flags
& BSF_WARNING
)
2061 skip_next_symbol
= TRUE
;
2067 /* Now do any format-specific adjustments to the symbol table, such
2068 as adding file symbols. */
2069 #ifdef tc_adjust_symtab
2070 tc_adjust_symtab ();
2072 #ifdef obj_adjust_symtab
2073 obj_adjust_symtab ();
2078 /* Stop if there is an error. */
2082 /* Now that all the sizes are known, and contents correct, we can
2083 start writing to the file. */
2085 /* If *_frob_file changes the symbol value at this point, it is
2086 responsible for moving the changed value into symp->bsym->value
2087 as well. Hopefully all symbol value changing can be done in
2092 #ifdef obj_frob_file
2095 #ifdef obj_coff_generate_pdata
2096 obj_coff_generate_pdata ();
2098 bfd_map_over_sections (stdoutput
, write_relocs
, (char *) 0);
2100 #ifdef tc_frob_file_after_relocs
2101 tc_frob_file_after_relocs ();
2103 #ifdef obj_frob_file_after_relocs
2104 obj_frob_file_after_relocs ();
2107 /* Once all relocations have been written, we can compress the
2108 contents of the debug sections. This needs to be done before
2109 we start writing any sections, because it will affect the file
2110 layout, which is fixed once we start writing contents. */
2111 if (flag_compress_debug
)
2112 bfd_map_over_sections (stdoutput
, compress_debug
, (char *) 0);
2114 bfd_map_over_sections (stdoutput
, write_contents
, (char *) 0);
2117 #ifdef TC_GENERIC_RELAX_TABLE
2118 /* Relax a fragment by scanning TC_GENERIC_RELAX_TABLE. */
2121 relax_frag (segT segment
, fragS
*fragP
, long stretch
)
2123 const relax_typeS
*this_type
;
2124 const relax_typeS
*start_type
;
2125 relax_substateT next_state
;
2126 relax_substateT this_state
;
2132 const relax_typeS
*table
;
2134 target
= fragP
->fr_offset
;
2135 address
= fragP
->fr_address
;
2136 table
= TC_GENERIC_RELAX_TABLE
;
2137 this_state
= fragP
->fr_subtype
;
2138 start_type
= this_type
= table
+ this_state
;
2139 symbolP
= fragP
->fr_symbol
;
2145 sym_frag
= symbol_get_frag (symbolP
);
2147 #ifndef DIFF_EXPR_OK
2148 know (sym_frag
!= NULL
);
2150 know (S_GET_SEGMENT (symbolP
) != absolute_section
2151 || sym_frag
== &zero_address_frag
);
2152 target
+= S_GET_VALUE (symbolP
);
2154 /* If SYM_FRAG has yet to be reached on this pass, assume it
2155 will move by STRETCH just as we did, unless there is an
2156 alignment frag between here and SYM_FRAG. An alignment may
2157 well absorb any STRETCH, and we don't want to choose a larger
2158 branch insn by overestimating the needed reach of this
2159 branch. It isn't critical to calculate TARGET exactly; We
2160 know we'll be doing another pass if STRETCH is non-zero. */
2163 && sym_frag
->relax_marker
!= fragP
->relax_marker
2164 && S_GET_SEGMENT (symbolP
) == segment
)
2167 || sym_frag
->region
== fragP
->region
)
2169 /* If we get here we know we have a forward branch. This
2170 relax pass may have stretched previous instructions so
2171 far that omitting STRETCH would make the branch
2172 negative. Don't allow this in case the negative reach is
2173 large enough to require a larger branch instruction. */
2174 else if (target
< address
)
2175 target
= fragP
->fr_next
->fr_address
+ stretch
;
2179 aim
= target
- address
- fragP
->fr_fix
;
2180 #ifdef TC_PCREL_ADJUST
2181 /* Currently only the ns32k family needs this. */
2182 aim
+= TC_PCREL_ADJUST (fragP
);
2185 #ifdef md_prepare_relax_scan
2186 /* Formerly called M68K_AIM_KLUDGE. */
2187 md_prepare_relax_scan (fragP
, address
, aim
, this_state
, this_type
);
2192 /* Look backwards. */
2193 for (next_state
= this_type
->rlx_more
; next_state
;)
2194 if (aim
>= this_type
->rlx_backward
)
2198 /* Grow to next state. */
2199 this_state
= next_state
;
2200 this_type
= table
+ this_state
;
2201 next_state
= this_type
->rlx_more
;
2206 /* Look forwards. */
2207 for (next_state
= this_type
->rlx_more
; next_state
;)
2208 if (aim
<= this_type
->rlx_forward
)
2212 /* Grow to next state. */
2213 this_state
= next_state
;
2214 this_type
= table
+ this_state
;
2215 next_state
= this_type
->rlx_more
;
2219 growth
= this_type
->rlx_length
- start_type
->rlx_length
;
2221 fragP
->fr_subtype
= this_state
;
2225 #endif /* defined (TC_GENERIC_RELAX_TABLE) */
2227 /* Relax_align. Advance location counter to next address that has 'alignment'
2228 lowest order bits all 0s, return size of adjustment made. */
2229 static relax_addressT
2230 relax_align (register relax_addressT address
, /* Address now. */
2231 register int alignment
/* Alignment (binary). */)
2233 relax_addressT mask
;
2234 relax_addressT new_address
;
2236 mask
= ~((~0) << alignment
);
2237 new_address
= (address
+ mask
) & (~mask
);
2238 #ifdef LINKER_RELAXING_SHRINKS_ONLY
2240 /* We must provide lots of padding, so the linker can discard it
2241 when needed. The linker will not add extra space, ever. */
2242 new_address
+= (1 << alignment
);
2244 return (new_address
- address
);
2247 /* Now we have a segment, not a crowd of sub-segments, we can make
2252 After this, all frags in this segment have addresses that are correct
2253 within the segment. Since segments live in different file addresses,
2254 these frag addresses may not be the same as final object-file
2258 relax_segment (struct frag
*segment_frag_root
, segT segment
, int pass
)
2260 unsigned long frag_count
;
2262 relax_addressT address
;
2266 /* In case md_estimate_size_before_relax() wants to make fixSs. */
2267 subseg_change (segment
, 0);
2269 /* For each frag in segment: count and store (a 1st guess of)
2273 for (frag_count
= 0, fragP
= segment_frag_root
;
2275 fragP
= fragP
->fr_next
, frag_count
++)
2277 fragP
->region
= region
;
2278 fragP
->relax_marker
= 0;
2279 fragP
->fr_address
= address
;
2280 address
+= fragP
->fr_fix
;
2282 switch (fragP
->fr_type
)
2285 address
+= fragP
->fr_offset
* fragP
->fr_var
;
2292 addressT offset
= relax_align (address
, (int) fragP
->fr_offset
);
2294 if (fragP
->fr_subtype
!= 0 && offset
> fragP
->fr_subtype
)
2297 if (offset
% fragP
->fr_var
!= 0)
2299 as_bad_where (fragP
->fr_file
, fragP
->fr_line
,
2300 _("alignment padding (%lu bytes) not a multiple of %ld"),
2301 (unsigned long) offset
, (long) fragP
->fr_var
);
2302 offset
-= (offset
% fragP
->fr_var
);
2311 /* Assume .org is nugatory. It will grow with 1st relax. */
2318 case rs_machine_dependent
:
2319 /* If fr_symbol is an expression, this call to
2320 resolve_symbol_value sets up the correct segment, which will
2321 likely be needed in md_estimate_size_before_relax. */
2322 if (fragP
->fr_symbol
)
2323 resolve_symbol_value (fragP
->fr_symbol
);
2325 address
+= md_estimate_size_before_relax (fragP
, segment
);
2328 #ifndef WORKING_DOT_WORD
2329 /* Broken words don't concern us yet. */
2330 case rs_broken_word
:
2335 /* Initial guess is always 1; doing otherwise can result in
2336 stable solutions that are larger than the minimum. */
2337 address
+= fragP
->fr_offset
= 1;
2341 address
+= eh_frame_estimate_size_before_relax (fragP
);
2345 address
+= dwarf2dbg_estimate_size_before_relax (fragP
);
2349 BAD_CASE (fragP
->fr_type
);
2356 unsigned long max_iterations
;
2358 /* Cumulative address adjustment. */
2361 /* Have we made any adjustment this pass? We can't just test
2362 stretch because one piece of code may have grown and another
2366 /* Most horrible, but gcc may give us some exception data that
2367 is impossible to assemble, of the form
2371 .uleb128 end - start
2377 If the leb128 is two bytes in size, then end-start is 128*128,
2378 which requires a three byte leb128. If the leb128 is three
2379 bytes in size, then end-start is 128*128-1, which requires a
2380 two byte leb128. We work around this dilemma by inserting
2381 an extra 4 bytes of alignment just after the .align. This
2382 works because the data after the align is accessed relative to
2385 This counter is used in a tiny state machine to detect
2386 whether a leb128 followed by an align is impossible to
2388 int rs_leb128_fudge
= 0;
2390 /* We want to prevent going into an infinite loop where one frag grows
2391 depending upon the location of a symbol which is in turn moved by
2392 the growing frag. eg:
2398 So we dictate that this algorithm can be at most O2. */
2399 max_iterations
= frag_count
* frag_count
;
2400 /* Check for overflow. */
2401 if (max_iterations
< frag_count
)
2402 max_iterations
= frag_count
;
2410 for (fragP
= segment_frag_root
; fragP
; fragP
= fragP
->fr_next
)
2413 addressT was_address
;
2417 fragP
->relax_marker
^= 1;
2418 was_address
= fragP
->fr_address
;
2419 address
= fragP
->fr_address
+= stretch
;
2420 symbolP
= fragP
->fr_symbol
;
2421 offset
= fragP
->fr_offset
;
2423 switch (fragP
->fr_type
)
2425 case rs_fill
: /* .fill never relaxes. */
2429 #ifndef WORKING_DOT_WORD
2430 /* JF: This is RMS's idea. I do *NOT* want to be blamed
2431 for it I do not want to write it. I do not want to have
2432 anything to do with it. This is not the proper way to
2433 implement this misfeature. */
2434 case rs_broken_word
:
2436 struct broken_word
*lie
;
2437 struct broken_word
*untruth
;
2439 /* Yes this is ugly (storing the broken_word pointer
2440 in the symbol slot). Still, this whole chunk of
2441 code is ugly, and I don't feel like doing anything
2442 about it. Think of it as stubbornness in action. */
2444 for (lie
= (struct broken_word
*) (fragP
->fr_symbol
);
2445 lie
&& lie
->dispfrag
== fragP
;
2446 lie
= lie
->next_broken_word
)
2452 offset
= (S_GET_VALUE (lie
->add
)
2454 - S_GET_VALUE (lie
->sub
));
2455 if (offset
<= -32768 || offset
>= 32767)
2457 if (flag_warn_displacement
)
2460 sprint_value (buf
, (addressT
) lie
->addnum
);
2461 as_warn_where (fragP
->fr_file
, fragP
->fr_line
,
2462 _(".word %s-%s+%s didn't fit"),
2463 S_GET_NAME (lie
->add
),
2464 S_GET_NAME (lie
->sub
),
2467 if (fragP
->fr_subtype
== 0)
2469 fragP
->fr_subtype
++;
2470 growth
+= md_short_jump_size
;
2473 /* Redirect *all* words of this table with the same
2474 target, lest we have to handle the case where the
2475 same target but with a offset that fits on this
2476 round overflows at the next relaxation round. */
2477 for (untruth
= (struct broken_word
*) (fragP
->fr_symbol
);
2478 untruth
&& untruth
->dispfrag
== lie
->dispfrag
;
2479 untruth
= untruth
->next_broken_word
)
2480 if ((symbol_get_frag (untruth
->add
)
2481 == symbol_get_frag (lie
->add
))
2482 && (S_GET_VALUE (untruth
->add
)
2483 == S_GET_VALUE (lie
->add
)))
2486 untruth
->use_jump
= lie
;
2490 growth
+= md_long_jump_size
;
2495 } /* case rs_broken_word */
2501 addressT oldoff
, newoff
;
2503 oldoff
= relax_align (was_address
+ fragP
->fr_fix
,
2505 newoff
= relax_align (address
+ fragP
->fr_fix
,
2508 if (fragP
->fr_subtype
!= 0)
2510 if (oldoff
> fragP
->fr_subtype
)
2512 if (newoff
> fragP
->fr_subtype
)
2516 growth
= newoff
- oldoff
;
2518 /* If this align happens to follow a leb128 and
2519 we have determined that the leb128 is bouncing
2520 in size, then break the cycle by inserting an
2523 && (rs_leb128_fudge
& 16) != 0
2524 && (rs_leb128_fudge
& 15) >= 2)
2526 segment_info_type
*seginfo
= seg_info (segment
);
2527 struct obstack
*ob
= &seginfo
->frchainP
->frch_obstack
;
2530 newf
= frag_alloc (ob
);
2531 obstack_blank_fast (ob
, fragP
->fr_var
);
2532 obstack_finish (ob
);
2533 memcpy (newf
, fragP
, SIZEOF_STRUCT_FRAG
);
2534 memcpy (newf
->fr_literal
,
2535 fragP
->fr_literal
+ fragP
->fr_fix
,
2537 newf
->fr_type
= rs_fill
;
2538 newf
->fr_address
= address
+ fragP
->fr_fix
+ newoff
;
2540 newf
->fr_offset
= (((offsetT
) 1 << fragP
->fr_offset
)
2542 if (newf
->fr_offset
* newf
->fr_var
2543 != (offsetT
) 1 << fragP
->fr_offset
)
2545 newf
->fr_offset
= (offsetT
) 1 << fragP
->fr_offset
;
2548 /* Include size of new frag in GROWTH. */
2549 growth
+= newf
->fr_offset
* newf
->fr_var
;
2550 /* Adjust the new frag address for the amount
2551 we'll add when we process the new frag. */
2552 newf
->fr_address
-= stretch
+ growth
;
2553 newf
->relax_marker
^= 1;
2554 fragP
->fr_next
= newf
;
2556 as_warn (_("padding added"));
2564 addressT target
= offset
;
2569 /* Convert from an actual address to an octet offset
2570 into the section. Here it is assumed that the
2571 section's VMA is zero, and can omit subtracting it
2572 from the symbol's value to get the address offset. */
2573 know (S_GET_SEGMENT (symbolP
)->vma
== 0);
2574 target
+= S_GET_VALUE (symbolP
) * OCTETS_PER_BYTE
;
2577 know (fragP
->fr_next
);
2578 after
= fragP
->fr_next
->fr_address
+ stretch
;
2579 growth
= target
- after
;
2584 /* Don't error on first few frag relax passes.
2585 The symbol might be an expression involving
2586 symbol values from other sections. If those
2587 sections have not yet been processed their
2588 frags will all have zero addresses, so we
2589 will calculate incorrect values for them. The
2590 number of passes we allow before giving an
2591 error is somewhat arbitrary. It should be at
2592 least one, with larger values requiring
2593 increasingly contrived dependencies between
2594 frags to trigger a false error. */
2597 /* Force another pass. */
2602 /* Growth may be negative, but variable part of frag
2603 cannot have fewer than 0 chars. That is, we can't
2605 as_bad_where (fragP
->fr_file
, fragP
->fr_line
,
2606 _("attempt to move .org backwards"));
2608 /* We've issued an error message. Change the
2609 frag to avoid cascading errors. */
2610 fragP
->fr_type
= rs_align
;
2611 fragP
->fr_subtype
= 0;
2612 fragP
->fr_offset
= 0;
2613 fragP
->fr_fix
= after
- address
;
2624 amount
= S_GET_VALUE (symbolP
);
2625 if (S_GET_SEGMENT (symbolP
) != absolute_section
2626 || S_IS_COMMON (symbolP
)
2627 || ! S_IS_DEFINED (symbolP
))
2629 as_bad_where (fragP
->fr_file
, fragP
->fr_line
,
2630 _(".space specifies non-absolute value"));
2631 /* Prevent repeat of this error message. */
2632 fragP
->fr_symbol
= 0;
2634 else if (amount
< 0)
2636 /* Don't error on first few frag relax passes.
2637 See rs_org comment for a longer explanation. */
2644 as_warn_where (fragP
->fr_file
, fragP
->fr_line
,
2645 _(".space or .fill with negative value, ignored"));
2646 fragP
->fr_symbol
= 0;
2649 growth
= (was_address
+ fragP
->fr_fix
+ amount
2650 - fragP
->fr_next
->fr_address
);
2654 case rs_machine_dependent
:
2655 #ifdef md_relax_frag
2656 growth
= md_relax_frag (segment
, fragP
, stretch
);
2658 #ifdef TC_GENERIC_RELAX_TABLE
2659 /* The default way to relax a frag is to look through
2660 TC_GENERIC_RELAX_TABLE. */
2661 growth
= relax_frag (segment
, fragP
, stretch
);
2662 #endif /* TC_GENERIC_RELAX_TABLE */
2671 value
= resolve_symbol_value (fragP
->fr_symbol
);
2672 size
= sizeof_leb128 (value
, fragP
->fr_subtype
);
2673 growth
= size
- fragP
->fr_offset
;
2674 fragP
->fr_offset
= size
;
2679 growth
= eh_frame_relax_frag (fragP
);
2683 growth
= dwarf2dbg_relax_frag (fragP
);
2687 BAD_CASE (fragP
->fr_type
);
2694 if (fragP
->fr_type
== rs_leb128
)
2695 rs_leb128_fudge
+= 16;
2696 else if (fragP
->fr_type
== rs_align
2697 && (rs_leb128_fudge
& 16) != 0
2699 rs_leb128_fudge
+= 16;
2701 rs_leb128_fudge
= 0;
2706 && (rs_leb128_fudge
& 16) == 0
2707 && (rs_leb128_fudge
& -16) != 0)
2708 rs_leb128_fudge
+= 1;
2710 rs_leb128_fudge
= 0;
2712 /* Until nothing further to relax. */
2713 while (stretched
&& -- max_iterations
);
2716 as_fatal (_("Infinite loop encountered whilst attempting to compute the addresses of symbols in section %s"),
2717 segment_name (segment
));
2720 for (fragP
= segment_frag_root
; fragP
; fragP
= fragP
->fr_next
)
2721 if (fragP
->last_fr_address
!= fragP
->fr_address
)
2723 fragP
->last_fr_address
= fragP
->fr_address
;
2730 number_to_chars_bigendian (char *buf
, valueT val
, int n
)
2736 buf
[n
] = val
& 0xff;
2742 number_to_chars_littleendian (char *buf
, valueT val
, int n
)
2748 *buf
++ = val
& 0xff;
2754 write_print_statistics (FILE *file
)
2756 fprintf (file
, "fixups: %d\n", n_fixups
);
2759 /* For debugging. */
2760 extern int indent_level
;
2763 print_fixup (fixS
*fixp
)
2766 fprintf (stderr
, "fix ");
2767 fprintf_vma (stderr
, (bfd_vma
)((bfd_hostptr_t
) fixp
));
2768 fprintf (stderr
, " %s:%d",fixp
->fx_file
, fixp
->fx_line
);
2770 fprintf (stderr
, " pcrel");
2771 if (fixp
->fx_pcrel_adjust
)
2772 fprintf (stderr
, " pcrel_adjust=%d", fixp
->fx_pcrel_adjust
);
2773 if (fixp
->fx_im_disp
)
2776 fprintf (stderr
, " im_disp=%d", fixp
->fx_im_disp
);
2778 fprintf (stderr
, " im_disp");
2782 fprintf (stderr
, " tcbit");
2784 fprintf (stderr
, " done");
2785 fprintf (stderr
, "\n size=%d frag=", fixp
->fx_size
);
2786 fprintf_vma (stderr
, (bfd_vma
) ((bfd_hostptr_t
) fixp
->fx_frag
));
2787 fprintf (stderr
, " where=%ld offset=%lx addnumber=%lx",
2788 (long) fixp
->fx_where
,
2789 (unsigned long) fixp
->fx_offset
,
2790 (unsigned long) fixp
->fx_addnumber
);
2791 fprintf (stderr
, "\n %s (%d)", bfd_get_reloc_code_name (fixp
->fx_r_type
),
2795 fprintf (stderr
, "\n +<");
2796 print_symbol_value_1 (stderr
, fixp
->fx_addsy
);
2797 fprintf (stderr
, ">");
2801 fprintf (stderr
, "\n -<");
2802 print_symbol_value_1 (stderr
, fixp
->fx_subsy
);
2803 fprintf (stderr
, ">");
2805 fprintf (stderr
, "\n");
2806 #ifdef TC_FIX_DATA_PRINT
2807 TC_FIX_DATA_PRINT (stderr
, fixp
);