1 /* write.c - emit .o file
2 Copyright (C) 1986, 87, 90, 91, 92, 93, 1994 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 2, 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
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
20 /* This thing should be set up to do byteordering correctly. But... */
25 #include "output-file.h"
27 /* The NOP_OPCODE is for the alignment fill value. Fill it with a nop
28 instruction so that the disassembler does not choke on it. */
30 #define NOP_OPCODE 0x00
33 #ifndef TC_ADJUST_RELOC_COUNT
34 #define TC_ADJUST_RELOC_COUNT(FIXP,COUNT)
37 #ifndef TC_FORCE_RELOCATION
38 #define TC_FORCE_RELOCATION(FIXP) 0
41 #ifndef WORKING_DOT_WORD
42 extern CONST
int md_short_jump_size
;
43 extern CONST
int md_long_jump_size
;
49 struct frag
*text_frag_root
;
50 struct frag
*data_frag_root
;
51 struct frag
*bss_frag_root
;
53 struct frag
*text_last_frag
; /* Last frag in segment. */
54 struct frag
*data_last_frag
; /* Last frag in segment. */
55 static struct frag
*bss_last_frag
; /* Last frag in segment. */
58 #if ! defined (BFD_ASSEMBLER) && ! defined (BFD)
59 static object_headers headers
;
60 static char *the_object_file
;
63 long string_byte_count
;
64 char *next_object_file_charP
; /* Tracks object file bytes. */
67 int magic_number_for_object_file
= DEFAULT_MAGIC_NUMBER_FOR_OBJECT_FILE
;
70 #endif /* BFD_ASSEMBLER */
73 static fixS
*fix_new_internal
PARAMS ((fragS
*, int where
, int size
,
74 symbolS
*add
, symbolS
*sub
,
75 offsetT offset
, int pcrel
,
76 bfd_reloc_code_real_type r_type
));
78 static fixS
*fix_new_internal
PARAMS ((fragS
*, int where
, int size
,
79 symbolS
*add
, symbolS
*sub
,
80 offsetT offset
, int pcrel
,
83 #if defined (BFD_ASSEMBLER) || !defined (BFD)
84 static long fixup_segment
PARAMS ((fixS
* fixP
, segT this_segment_type
));
86 static relax_addressT relax_align
PARAMS ((relax_addressT addr
, int align
));
91 * Create a fixS in obstack 'notes'.
94 fix_new_internal (frag
, where
, size
, add_symbol
, sub_symbol
, offset
, pcrel
,
96 fragS
*frag
; /* Which frag? */
97 int where
; /* Where in that frag? */
98 int size
; /* 1, 2, or 4 usually. */
99 symbolS
*add_symbol
; /* X_add_symbol. */
100 symbolS
*sub_symbol
; /* X_op_symbol. */
101 offsetT offset
; /* X_add_number. */
102 int pcrel
; /* TRUE if PC-relative relocation. */
104 bfd_reloc_code_real_type r_type
; /* Relocation type */
106 int r_type
; /* Relocation type */
111 fixP
= (fixS
*) obstack_alloc (¬es
, sizeof (fixS
));
113 fixP
->fx_frag
= frag
;
114 fixP
->fx_where
= where
;
115 fixP
->fx_size
= size
;
116 fixP
->fx_addsy
= add_symbol
;
117 fixP
->fx_subsy
= sub_symbol
;
118 fixP
->fx_offset
= offset
;
119 fixP
->fx_pcrel
= pcrel
;
120 #if defined(NEED_FX_R_TYPE) || defined (BFD_ASSEMBLER)
121 fixP
->fx_r_type
= r_type
;
123 fixP
->fx_im_disp
= 0;
124 fixP
->fx_pcrel_adjust
= 0;
125 fixP
->fx_bit_fixP
= 0;
126 fixP
->fx_addnumber
= 0;
127 fixP
->tc_fix_data
= NULL
;
135 as_where (&fixP
->fx_file
, &fixP
->fx_line
);
137 /* Usually, we want relocs sorted numerically, but while
138 comparing to older versions of gas that have relocs
139 reverse sorted, it is convenient to have this compile
140 time option. xoxorich. */
145 fixS
**seg_fix_rootP
= &frchain_now
->fix_root
;
146 fixS
**seg_fix_tailP
= &frchain_now
->fix_tail
;
149 #ifdef REVERSE_SORT_RELOCS
151 fixP
->fx_next
= *seg_fix_rootP
;
152 *seg_fix_rootP
= fixP
;
154 #else /* REVERSE_SORT_RELOCS */
156 fixP
->fx_next
= NULL
;
159 (*seg_fix_tailP
)->fx_next
= fixP
;
161 *seg_fix_rootP
= fixP
;
162 *seg_fix_tailP
= fixP
;
164 #endif /* REVERSE_SORT_RELOCS */
171 /* Create a fixup relative to a symbol (plus a constant). */
174 fix_new (frag
, where
, size
, add_symbol
, offset
, pcrel
, r_type
)
175 fragS
*frag
; /* Which frag? */
176 int where
; /* Where in that frag? */
177 short int size
; /* 1, 2, or 4 usually. */
178 symbolS
*add_symbol
; /* X_add_symbol. */
179 offsetT offset
; /* X_add_number. */
180 int pcrel
; /* TRUE if PC-relative relocation. */
182 bfd_reloc_code_real_type r_type
; /* Relocation type */
184 int r_type
; /* Relocation type */
187 return fix_new_internal (frag
, where
, size
, add_symbol
,
188 (symbolS
*) NULL
, offset
, pcrel
, r_type
);
191 /* Create a fixup for an expression. Currently we only support fixups
192 for difference expressions. That is itself more than most object
193 file formats support anyhow. */
196 fix_new_exp (frag
, where
, size
, exp
, pcrel
, r_type
)
197 fragS
*frag
; /* Which frag? */
198 int where
; /* Where in that frag? */
199 short int size
; /* 1, 2, or 4 usually. */
200 expressionS
*exp
; /* Expression. */
201 int pcrel
; /* TRUE if PC-relative relocation. */
203 bfd_reloc_code_real_type r_type
; /* Relocation type */
205 int r_type
; /* Relocation type */
218 sub
= exp
->X_add_symbol
;
219 off
= exp
->X_add_number
;
223 sub
= exp
->X_op_symbol
;
226 add
= exp
->X_add_symbol
;
229 off
= exp
->X_add_number
;
233 as_bad ("expression too complex for fixup");
236 return fix_new_internal (frag
, where
, size
, add
, sub
, off
,
240 /* Append a string onto another string, bumping the pointer along. */
242 append (charPP
, fromP
, length
)
245 unsigned long length
;
247 /* Don't trust memcpy() of 0 chars. */
251 memcpy (*charPP
, fromP
, length
);
255 #ifndef BFD_ASSEMBLER
256 int section_alignment
[SEG_MAXIMUM_ORDINAL
];
260 * This routine records the largest alignment seen for each segment.
261 * If the beginning of the segment is aligned on the worst-case
262 * boundary, all of the other alignments within it will work. At
263 * least one object format really uses this info.
266 record_alignment (seg
, align
)
267 /* Segment to which alignment pertains */
269 /* Alignment, as a power of 2 (e.g., 1 => 2-byte boundary, 2 => 4-byte
274 if (align
> bfd_get_section_alignment (stdoutput
, seg
))
275 bfd_set_section_alignment (stdoutput
, seg
, align
);
277 if (align
> section_alignment
[(int) seg
])
278 section_alignment
[(int) seg
] = align
;
282 #if defined (BFD_ASSEMBLER) || ! defined (BFD)
285 chain_frchains_together_1 (section
, frchp
)
287 struct frchain
*frchp
;
289 fragS dummy
, *prev_frag
= &dummy
;
290 fixS fix_dummy
, *prev_fix
= &fix_dummy
;
292 for (; frchp
&& frchp
->frch_seg
== section
; frchp
= frchp
->frch_next
)
294 prev_frag
->fr_next
= frchp
->frch_root
;
295 prev_frag
= frchp
->frch_last
;
297 if (frchp
->fix_root
!= (fixS
*) NULL
)
299 if (seg_info (section
)->fix_root
== (fixS
*) NULL
)
300 seg_info (section
)->fix_root
= frchp
->fix_root
;
301 prev_fix
->fx_next
= frchp
->fix_root
;
302 prev_fix
= frchp
->fix_tail
;
306 prev_frag
->fr_next
= 0;
315 chain_frchains_together (abfd
, section
, xxx
)
316 bfd
*abfd
; /* unused */
318 PTR xxx
; /* unused */
320 segment_info_type
*info
;
322 /* BFD may have introduced its own sections without using
323 subseg_new, so it is possible that seg_info is NULL. */
324 info
= seg_info (section
);
325 if (info
!= (segment_info_type
*) NULL
)
326 info
->frchainP
->frch_last
327 = chain_frchains_together_1 (section
, info
->frchainP
);
332 #if !defined (BFD) && !defined (BFD_ASSEMBLER)
335 remove_subsegs (head
, seg
, root
, last
)
341 *root
= head
->frch_root
;
342 *last
= chain_frchains_together_1 (seg
, head
);
347 #if defined (BFD_ASSEMBLER) || !defined (BFD)
351 cvt_frag_to_fill (sec
, fragP
)
356 cvt_frag_to_fill (headers
, fragP
)
357 object_headers
*headers
;
361 switch (fragP
->fr_type
)
366 HANDLE_ALIGN (fragP
);
368 fragP
->fr_type
= rs_fill
;
369 know (fragP
->fr_next
!= NULL
);
370 fragP
->fr_offset
= (fragP
->fr_next
->fr_address
372 - fragP
->fr_fix
) / fragP
->fr_var
;
378 case rs_machine_dependent
:
380 md_convert_frag (stdoutput
, sec
, fragP
);
382 md_convert_frag (headers
, fragP
);
385 assert (fragP
->fr_next
== NULL
|| (fragP
->fr_next
->fr_address
- fragP
->fr_address
== fragP
->fr_fix
));
388 * After md_convert_frag, we make the frag into a ".space 0".
389 * Md_convert_frag() should set up any fixSs and constants
395 #ifndef WORKING_DOT_WORD
398 struct broken_word
*lie
;
400 if (fragP
->fr_subtype
)
402 fragP
->fr_fix
+= md_short_jump_size
;
403 for (lie
= (struct broken_word
*) (fragP
->fr_symbol
);
404 lie
&& lie
->dispfrag
== fragP
;
405 lie
= lie
->next_broken_word
)
407 fragP
->fr_fix
+= md_long_jump_size
;
415 BAD_CASE (fragP
->fr_type
);
420 #endif /* defined (BFD_ASSEMBLER) || !defined (BFD) */
424 relax_and_size_seg (abfd
, sec
, xxx
)
431 segment_info_type
*seginfo
;
433 valueT size
, newsize
;
435 flags
= bfd_get_section_flags (abfd
, sec
);
437 seginfo
= (segment_info_type
*) bfd_get_section_userdata (abfd
, sec
);
438 if (seginfo
&& seginfo
->frchainP
)
440 relax_segment (seginfo
->frchainP
->frch_root
, sec
);
441 for (fragp
= seginfo
->frchainP
->frch_root
; fragp
; fragp
= fragp
->fr_next
)
442 cvt_frag_to_fill (sec
, fragp
);
443 for (fragp
= seginfo
->frchainP
->frch_root
;
445 fragp
= fragp
->fr_next
)
446 /* walk to last elt */;
447 size
= fragp
->fr_address
+ fragp
->fr_fix
;
452 if (size
> 0 && ! seginfo
->bss
)
453 flags
|= SEC_HAS_CONTENTS
;
455 /* @@ This is just an approximation. */
456 if (seginfo
&& seginfo
->fix_root
)
460 x
= bfd_set_section_flags (abfd
, sec
, flags
);
463 newsize
= md_section_align (sec
, size
);
464 x
= bfd_set_section_size (abfd
, sec
, newsize
);
467 /* If the size had to be rounded up, add some padding in the last
469 assert (newsize
>= size
);
472 fragS
*last
= seginfo
->frchainP
->frch_last
;
473 fragp
= seginfo
->frchainP
->frch_root
;
474 while (fragp
->fr_next
!= last
)
475 fragp
= fragp
->fr_next
;
476 last
->fr_address
= size
;
477 fragp
->fr_offset
+= newsize
- size
;
480 #ifdef tc_frob_section
481 tc_frob_section (sec
);
483 #ifdef obj_frob_section
484 obj_frob_section (sec
);
490 dump_section_relocs (abfd
, sec
, stream_
)
495 FILE *stream
= (FILE *) stream_
;
496 segment_info_type
*seginfo
= seg_info (sec
);
497 fixS
*fixp
= seginfo
->fix_root
;
502 fprintf (stream
, "sec %s relocs:\n", sec
->name
);
505 symbolS
*s
= fixp
->fx_addsy
;
507 fprintf (stream
, " %08x: %s(%s+%x)+%x\n", fixp
,
508 S_GET_NAME (s
), s
->bsym
->section
->name
,
509 S_GET_VALUE (s
), fixp
->fx_offset
);
511 fprintf (stream
, " %08x: type %d no sym\n", fixp
, fixp
->fx_r_type
);
512 fixp
= fixp
->fx_next
;
516 #define dump_section_relocs(ABFD,SEC,STREAM) (void)(ABFD,SEC,STREAM)
519 #ifndef EMIT_SECTION_SYMBOLS
520 #define EMIT_SECTION_SYMBOLS 1
524 adjust_reloc_syms (abfd
, sec
, xxx
)
529 segment_info_type
*seginfo
= seg_info (sec
);
535 dump_section_relocs (abfd
, sec
, stderr
);
537 for (fixp
= seginfo
->fix_root
; fixp
; fixp
= fixp
->fx_next
)
540 else if (fixp
->fx_addsy
)
542 symbolS
*sym
= fixp
->fx_addsy
;
543 asection
*symsec
= sym
->bsym
->section
;
545 /* If it's one of these sections, assume the symbol is
546 definitely going to be output. The code in
547 md_estimate_size_before_relax in tc-mips.c uses this test
548 as well, so if you change this code you should look at that
550 if (symsec
== &bfd_und_section
551 || symsec
== &bfd_abs_section
552 || bfd_is_com_section (symsec
))
554 fixp
->fx_addsy
->sy_used_in_reloc
= 1;
558 /* Since we're reducing to section symbols, don't attempt to reduce
559 anything that's already using one. */
560 if (sym
->bsym
->flags
& BSF_SECTION_SYM
)
562 fixp
->fx_addsy
->sy_used_in_reloc
= 1;
566 /* Is there some other reason we can't adjust this one? (E.g.,
567 call/bal links in i960-bout symbols.) */
568 #ifdef obj_fix_adjustable
569 if (! obj_fix_adjustable (fixp
))
571 fixp
->fx_addsy
->sy_used_in_reloc
= 1;
576 /* Is there some other (target cpu dependent) reason we can't adjust
577 this one? (E.g. relocations involving function addresses on
579 #ifdef tc_fix_adjustable
580 if (! tc_fix_adjustable (fixp
))
582 fixp
->fx_addsy
->sy_used_in_reloc
= 1;
587 /* If the section symbol isn't going to be output, the relocs
588 at least should still work. If not, figure out what to do
589 when we run into that case. */
590 fixp
->fx_offset
+= S_GET_VALUE (sym
);
592 fixp
->fx_offset
+= sym
->sy_frag
->fr_address
;
593 fixp
->fx_addsy
= section_symbol (symsec
);
594 fixp
->fx_addsy
->sy_used_in_reloc
= 1;
596 #ifdef RELOC_REQUIRES_SYMBOL
599 /* There was no symbol required by this relocation. However,
600 BFD doesn't really handle relocations without symbols well.
601 (At least, the COFF support doesn't.) So for now we fake up
602 a local symbol in the absolute section. */
603 static symbolS
*abs_sym
;
606 abs_sym
= section_symbol (absolute_section
);
607 abs_sym
->sy_used_in_reloc
= 1;
609 fixp
->fx_addsy
= abs_sym
;
613 dump_section_relocs (abfd
, sec
, stderr
);
617 write_relocs (abfd
, sec
, xxx
)
622 segment_info_type
*seginfo
= seg_info (sec
);
629 /* If seginfo is NULL, we did not create this section; don't do
634 fixup_segment (seginfo
->fix_root
, sec
);
637 for (fixp
= seginfo
->fix_root
; fixp
; fixp
= fixp
->fx_next
)
640 #ifndef RELOC_EXPANSION_POSSIBLE
641 /* Set up reloc information as well. */
642 relocs
= (arelent
**) bfd_alloc_by_size_t (stdoutput
,
643 n
* sizeof (arelent
*));
644 memset ((char*)relocs
, 0, n
* sizeof (arelent
*));
647 for (fixp
= seginfo
->fix_root
; fixp
!= (fixS
*) NULL
; fixp
= fixp
->fx_next
)
651 bfd_reloc_status_type s
;
658 reloc
= tc_gen_reloc (sec
, fixp
);
664 data
= fixp
->fx_frag
->fr_literal
+ fixp
->fx_where
;
665 if (fixp
->fx_where
+ fixp
->fx_size
666 > fixp
->fx_frag
->fr_fix
+ fixp
->fx_frag
->fr_offset
)
669 if (reloc
->howto
->partial_inplace
== false
670 && reloc
->howto
->pcrel_offset
== true
671 && reloc
->howto
->pc_relative
== true)
673 /* bfd_perform_relocation screws this up */
674 reloc
->addend
+= reloc
->address
;
676 /* Pass bogus address so that when bfd_perform_relocation adds
677 `reloc->address' back in, it'll come up with `data', which is where
678 we want it to operate. We can't just do it by fudging reloc->address,
679 since that might be used in the calculations(?). */
680 s
= bfd_perform_relocation (stdoutput
, reloc
, data
- reloc
->address
,
681 sec
, stdoutput
, &err
);
687 as_fatal ("bad return from bfd_perform_relocation");
692 n
= n
* MAX_RELOC_EXPANSION
;
693 /* Set up reloc information as well. */
694 relocs
= (arelent
**) bfd_alloc_by_size_t (stdoutput
,
695 n
* sizeof (arelent
*));
698 for (fixp
= seginfo
->fix_root
; fixp
!= (fixS
*) NULL
; fixp
= fixp
->fx_next
)
702 bfd_reloc_status_type s
;
710 reloc
= tc_gen_reloc (sec
, fixp
);
712 for (j
= 0; reloc
[j
]; j
++)
714 relocs
[i
++] = reloc
[j
];
717 data
= fixp
->fx_frag
->fr_literal
+ fixp
->fx_where
;
718 if (fixp
->fx_where
+ fixp
->fx_size
719 > fixp
->fx_frag
->fr_fix
+ fixp
->fx_frag
->fr_offset
)
721 for (j
= 0; reloc
[j
]; j
++)
723 s
= bfd_perform_relocation (stdoutput
, reloc
[j
],
724 data
- reloc
[0]->address
,
725 sec
, stdoutput
, &err
);
731 as_fatal ("bad return from bfd_perform_relocation");
739 bfd_set_reloc (stdoutput
, sec
, relocs
, n
);
741 bfd_set_section_flags (abfd
, sec
,
742 (bfd_get_section_flags (abfd
, sec
)
743 & (flagword
) ~SEC_RELOC
));
750 fprintf (stderr
, "relocs for sec %s\n", sec
->name
);
751 for (i
= 0; i
< n
; i
++)
755 fprintf (stderr
, " reloc %2d @%08x off %4x : sym %-10s addend %x\n",
756 i
, r
, r
->address
, s
->name
, r
->addend
);
763 write_contents (abfd
, sec
, xxx
)
768 segment_info_type
*seginfo
= seg_info (sec
);
769 unsigned long offset
= 0;
772 /* Write out the frags. */
774 || ! (bfd_get_section_flags (abfd
, sec
) & SEC_HAS_CONTENTS
))
777 for (f
= seginfo
->frchainP
->frch_root
;
782 unsigned long fill_size
;
786 assert (f
->fr_type
== rs_fill
);
789 x
= bfd_set_section_contents (stdoutput
, sec
,
790 f
->fr_literal
, (file_ptr
) offset
,
791 (bfd_size_type
) f
->fr_fix
);
795 fill_literal
= f
->fr_literal
+ f
->fr_fix
;
796 fill_size
= f
->fr_var
;
797 count
= f
->fr_offset
;
799 if (fill_size
&& count
)
802 x
= bfd_set_section_contents (stdoutput
, sec
,
803 fill_literal
, (file_ptr
) offset
,
804 (bfd_size_type
) fill_size
);
812 #if defined(BFD_ASSEMBLER) || (!defined (BFD) && !defined(OBJ_AOUT))
814 merge_data_into_text ()
816 #if defined(BFD_ASSEMBLER) || defined(MANY_SEGMENTS)
817 seg_info (text_section
)->frchainP
->frch_last
->fr_next
=
818 seg_info (data_section
)->frchainP
->frch_root
;
819 seg_info (text_section
)->frchainP
->frch_last
=
820 seg_info (data_section
)->frchainP
->frch_last
;
821 seg_info (data_section
)->frchainP
= 0;
825 text_last_frag
->fr_next
= data_frag_root
;
826 text_last_frag
= data_last_frag
;
827 data_last_frag
= NULL
;
828 data_frag_root
= NULL
;
831 for (tmp
= text_fix_root
; tmp
->fx_next
; tmp
= tmp
->fx_next
);;
832 tmp
->fx_next
= data_fix_root
;
833 text_fix_tail
= data_fix_tail
;
836 text_fix_root
= data_fix_root
;
837 data_fix_root
= NULL
;
840 #endif /* BFD_ASSEMBLER || (! BFD && ! OBJ_AOUT) */
842 #if !defined (BFD_ASSEMBLER) && !defined (BFD)
844 relax_and_size_all_segments ()
848 relax_segment (text_frag_root
, SEG_TEXT
);
849 relax_segment (data_frag_root
, SEG_DATA
);
850 relax_segment (bss_frag_root
, SEG_BSS
);
852 * Now the addresses of frags are correct within the segment.
855 know (text_last_frag
->fr_type
== rs_fill
&& text_last_frag
->fr_offset
== 0);
856 H_SET_TEXT_SIZE (&headers
, text_last_frag
->fr_address
);
857 text_last_frag
->fr_address
= H_GET_TEXT_SIZE (&headers
);
860 * Join the 2 segments into 1 huge segment.
861 * To do this, re-compute every rn_address in the SEG_DATA frags.
862 * Then join the data frags after the text frags.
864 * Determine a_data [length of data segment].
868 register relax_addressT slide
;
870 know ((text_last_frag
->fr_type
== rs_fill
) && (text_last_frag
->fr_offset
== 0));
872 H_SET_DATA_SIZE (&headers
, data_last_frag
->fr_address
);
873 data_last_frag
->fr_address
= H_GET_DATA_SIZE (&headers
);
874 slide
= H_GET_TEXT_SIZE (&headers
); /* & in file of the data segment. */
876 #define RoundUp(N,S) (((N)+(S)-1)&-(S))
877 /* For b.out: If the data section has a strict alignment
878 requirement, its load address in the .o file will be
879 rounded up from the size of the text section. These
880 two values are *not* the same! Similarly for the bss
882 slide
= RoundUp (slide
, 1 << section_alignment
[SEG_DATA
]);
885 for (fragP
= data_frag_root
; fragP
; fragP
= fragP
->fr_next
)
887 fragP
->fr_address
+= slide
;
888 } /* for each data frag */
890 know (text_last_frag
!= 0);
891 text_last_frag
->fr_next
= data_frag_root
;
895 H_SET_DATA_SIZE (&headers
, 0);
899 /* See above comments on b.out data section address. */
902 if (data_last_frag
== 0)
903 bss_vma
= H_GET_TEXT_SIZE (&headers
);
905 bss_vma
= data_last_frag
->fr_address
;
906 bss_vma
= RoundUp (bss_vma
, 1 << section_alignment
[SEG_BSS
]);
907 bss_address_frag
.fr_address
= bss_vma
;
909 #else /* ! OBJ_BOUT */
910 bss_address_frag
.fr_address
= (H_GET_TEXT_SIZE (&headers
) +
911 H_GET_DATA_SIZE (&headers
));
913 #endif /* ! OBJ_BOUT */
915 /* Slide all the frags */
918 relax_addressT slide
= bss_address_frag
.fr_address
;
920 for (fragP
= bss_frag_root
; fragP
; fragP
= fragP
->fr_next
)
922 fragP
->fr_address
+= slide
;
923 } /* for each bss frag */
927 H_SET_BSS_SIZE (&headers
,
928 bss_last_frag
->fr_address
- bss_frag_root
->fr_address
);
930 H_SET_BSS_SIZE (&headers
, 0);
932 #endif /* ! BFD_ASSEMBLER && ! BFD */
934 #if defined (BFD_ASSEMBLER) || !defined (BFD)
939 register struct frchain
*frchainP
; /* Track along all frchains. */
940 #if ! defined (BFD_ASSEMBLER) || ! defined (WORKING_DOT_WORD)
941 register fragS
*fragP
; /* Track along all frags. */
943 #if !defined (BFD_ASSEMBLER) && !defined (OBJ_VMS)
944 long object_file_size
;
947 /* Do we really want to write it? */
950 n_warns
= had_warnings ();
951 n_errs
= had_errors ();
952 /* The -Z flag indicates that an object file should be generated,
953 regardless of warnings and errors. */
956 if (n_warns
|| n_errs
)
957 as_warn ("%d error%s, %d warning%s, generating bad object file.\n",
958 n_errs
, n_errs
== 1 ? "" : "s",
959 n_warns
, n_warns
== 1 ? "" : "s");
964 as_fatal ("%d error%s, %d warning%s, no object file generated.\n",
965 n_errs
, n_errs
== 1 ? "" : "s",
966 n_warns
, n_warns
== 1 ? "" : "s");
972 * Under VMS we try to be compatible with VAX-11 "C". Thus, we
973 * call a routine to check for the definition of the procedure
974 * "_main", and if so -- fix it up so that it can be program
977 VMS_Check_For_Main ();
980 /* After every sub-segment, we fake an ".align ...". This conforms to
981 BSD4.2 brane-damage. We then fake ".fill 0" because that is the kind of
982 frag that requires least thought. ".align" frags like to have a
983 following frag since that makes calculating their intended length
986 @@ Is this really necessary?? */
987 #ifndef SUB_SEGMENT_ALIGN
989 #define SUB_SEGMENT_ALIGN(SEG) (0)
991 #define SUB_SEGMENT_ALIGN(SEG) (2)
994 for (frchainP
= frchain_root
; frchainP
; frchainP
= frchainP
->frch_next
)
996 subseg_set (frchainP
->frch_seg
, frchainP
->frch_subseg
);
997 frag_align (SUB_SEGMENT_ALIGN (now_seg
), NOP_OPCODE
);
998 /* frag_align will have left a new frag.
999 Use this last frag for an empty ".fill".
1001 For this segment ...
1002 Create a last frag. Do not leave a "being filled in frag". */
1003 frag_wane (frag_now
);
1004 frag_now
->fr_fix
= 0;
1005 know (frag_now
->fr_next
== NULL
);
1008 /* From now on, we don't care about sub-segments. Build one frag chain
1009 for each segment. Linked thru fr_next. */
1011 #ifdef BFD_ASSEMBLER
1012 /* Remove the sections created by gas for its own purposes. */
1014 asection
**seclist
, *sec
;
1015 seclist
= &stdoutput
->sections
;
1016 while (seclist
&& *seclist
)
1019 while (sec
== reg_section
|| sec
== expr_section
)
1023 stdoutput
->section_count
--;
1028 seclist
= &(*seclist
)->next
;
1032 bfd_map_over_sections (stdoutput
, chain_frchains_together
, (char *) 0);
1034 remove_subsegs (frchain_root
, SEG_TEXT
, &text_frag_root
, &text_last_frag
);
1035 remove_subsegs (data0_frchainP
, SEG_DATA
, &data_frag_root
, &data_last_frag
);
1036 remove_subsegs (bss0_frchainP
, SEG_BSS
, &bss_frag_root
, &bss_last_frag
);
1039 /* We have two segments. If user gave -R flag, then we must put the
1040 data frags into the text segment. Do this before relaxing so
1041 we know to take advantage of -R and make shorter addresses. */
1042 #if !defined (OBJ_AOUT) || defined (BFD_ASSEMBLER)
1045 merge_data_into_text ();
1049 #ifdef BFD_ASSEMBLER
1050 bfd_map_over_sections (stdoutput
, relax_and_size_seg
, (char *) 0);
1052 relax_and_size_all_segments ();
1053 #endif /* BFD_ASSEMBLER */
1055 #ifndef BFD_ASSEMBLER
1058 * Crawl the symbol chain.
1060 * For each symbol whose value depends on a frag, take the address of
1061 * that frag and subsume it into the value of the symbol.
1062 * After this, there is just one way to lookup a symbol value.
1063 * Values are left in their final state for object file emission.
1064 * We adjust the values of 'L' local symbols, even if we do
1065 * not intend to emit them to the object file, because their values
1066 * are needed for fix-ups.
1068 * Unless we saw a -L flag, remove all symbols that begin with 'L'
1069 * from the symbol chain. (They are still pointed to by the fixes.)
1071 * Count the remaining symbols.
1072 * Assign a symbol number to each symbol.
1073 * Count the number of string-table chars we will emit.
1074 * Put this info into the headers as appropriate.
1077 know (zero_address_frag
.fr_address
== 0);
1078 string_byte_count
= sizeof (string_byte_count
);
1080 obj_crawl_symbol_chain (&headers
);
1082 if (string_byte_count
== sizeof (string_byte_count
))
1083 string_byte_count
= 0;
1085 H_SET_STRING_SIZE (&headers
, string_byte_count
);
1088 * Addresses of frags now reflect addresses we use in the object file.
1089 * Symbol values are correct.
1090 * Scan the frags, converting any ".org"s and ".align"s to ".fill"s.
1091 * Also converting any machine-dependent frags using md_convert_frag();
1093 subseg_change (SEG_TEXT
, 0);
1095 for (fragP
= text_frag_root
; fragP
; fragP
= fragP
->fr_next
)
1097 cvt_frag_to_fill (&headers
, fragP
);
1099 /* Some assert macros don't work with # directives mixed in. */
1101 if (!(fragP
->fr_next
== NULL
1103 || fragP
->fr_next
== data_frag_root
1105 || ((fragP
->fr_next
->fr_address
- fragP
->fr_address
)
1106 == (fragP
->fr_fix
+ fragP
->fr_offset
* fragP
->fr_var
))))
1110 #endif /* ! BFD_ASSEMBLER */
1112 #ifndef WORKING_DOT_WORD
1114 struct broken_word
*lie
;
1115 struct broken_word
**prevP
;
1117 prevP
= &broken_words
;
1118 for (lie
= broken_words
; lie
; lie
= lie
->next_broken_word
)
1123 exp
.X_op
= O_subtract
;
1124 exp
.X_add_symbol
= lie
->add
;
1125 exp
.X_op_symbol
= lie
->sub
;
1126 exp
.X_add_number
= lie
->addnum
;
1127 #ifdef BFD_ASSEMBLER
1128 fix_new_exp (lie
->frag
,
1129 lie
->word_goes_here
- lie
->frag
->fr_literal
,
1130 2, &exp
, 0, BFD_RELOC_NONE
);
1132 #if defined(TC_SPARC) || defined(TC_A29K) || defined(NEED_FX_R_TYPE)
1133 fix_new_exp (lie
->frag
,
1134 lie
->word_goes_here
- lie
->frag
->fr_literal
,
1135 2, &exp
, 0, NO_RELOC
);
1138 fix_new_ns32k_exp (lie
->frag
,
1139 lie
->word_goes_here
- lie
->frag
->fr_literal
,
1140 2, &exp
, 0, 0, 2, 0, 0);
1142 fix_new_exp (lie
->frag
,
1143 lie
->word_goes_here
- lie
->frag
->fr_literal
,
1145 #endif /* TC_NS32K */
1146 #endif /* TC_SPARC|TC_A29K|NEED_FX_R_TYPE */
1147 #endif /* BFD_ASSEMBLER */
1148 *prevP
= lie
->next_broken_word
;
1151 prevP
= &(lie
->next_broken_word
);
1153 for (lie
= broken_words
; lie
;)
1155 struct broken_word
*untruth
;
1157 addressT table_addr
;
1158 addressT from_addr
, to_addr
;
1161 fragP
= lie
->dispfrag
;
1163 /* Find out how many broken_words go here. */
1165 for (untruth
= lie
; untruth
&& untruth
->dispfrag
== fragP
; untruth
= untruth
->next_broken_word
)
1166 if (untruth
->added
== 1)
1169 table_ptr
= lie
->dispfrag
->fr_opcode
;
1170 table_addr
= lie
->dispfrag
->fr_address
+ (table_ptr
- lie
->dispfrag
->fr_literal
);
1171 /* Create the jump around the long jumps. This is a short
1172 jump from table_ptr+0 to table_ptr+n*long_jump_size. */
1173 from_addr
= table_addr
;
1174 to_addr
= table_addr
+ md_short_jump_size
+ n
* md_long_jump_size
;
1175 md_create_short_jump (table_ptr
, from_addr
, to_addr
, lie
->dispfrag
, lie
->add
);
1176 table_ptr
+= md_short_jump_size
;
1177 table_addr
+= md_short_jump_size
;
1179 for (m
= 0; lie
&& lie
->dispfrag
== fragP
; m
++, lie
= lie
->next_broken_word
)
1181 if (lie
->added
== 2)
1183 /* Patch the jump table */
1184 /* This is the offset from ??? to table_ptr+0 */
1185 to_addr
= table_addr
- S_GET_VALUE (lie
->sub
);
1186 md_number_to_chars (lie
->word_goes_here
, to_addr
, 2);
1187 for (untruth
= lie
->next_broken_word
; untruth
&& untruth
->dispfrag
== fragP
; untruth
= untruth
->next_broken_word
)
1189 if (untruth
->use_jump
== lie
)
1190 md_number_to_chars (untruth
->word_goes_here
, to_addr
, 2);
1193 /* Install the long jump */
1194 /* this is a long jump from table_ptr+0 to the final target */
1195 from_addr
= table_addr
;
1196 to_addr
= S_GET_VALUE (lie
->add
) + lie
->addnum
;
1197 md_create_long_jump (table_ptr
, from_addr
, to_addr
, lie
->dispfrag
, lie
->add
);
1198 table_ptr
+= md_long_jump_size
;
1199 table_addr
+= md_long_jump_size
;
1203 #endif /* not WORKING_DOT_WORD */
1205 #ifndef BFD_ASSEMBLER
1209 * Scan every FixS performing fixups. We had to wait until now to do
1210 * this because md_convert_frag() may have made some fixSs.
1214 subseg_change (SEG_TEXT
, 0);
1215 trsize
= md_reloc_size
* fixup_segment (text_fix_root
, SEG_TEXT
);
1216 subseg_change (SEG_DATA
, 0);
1217 drsize
= md_reloc_size
* fixup_segment (data_fix_root
, SEG_DATA
);
1218 H_SET_RELOCATION_SIZE (&headers
, trsize
, drsize
);
1220 /* FIXME move this stuff into the pre-write-hook */
1221 H_SET_MAGIC_NUMBER (&headers
, magic_number_for_object_file
);
1222 H_SET_ENTRY_POINT (&headers
, 0);
1224 obj_pre_write_hook (&headers
); /* extra coff stuff */
1226 object_file_size
= H_GET_FILE_SIZE (&headers
);
1227 next_object_file_charP
= the_object_file
= xmalloc (object_file_size
);
1229 output_file_create (out_file_name
);
1231 obj_header_append (&next_object_file_charP
, &headers
);
1233 know ((next_object_file_charP
- the_object_file
) == H_GET_HEADER_SIZE (&headers
));
1238 for (fragP
= text_frag_root
; fragP
; fragP
= fragP
->fr_next
)
1240 register long count
;
1241 register char *fill_literal
;
1242 register long fill_size
;
1244 know (fragP
->fr_type
== rs_fill
);
1245 append (&next_object_file_charP
, fragP
->fr_literal
, (unsigned long) fragP
->fr_fix
);
1246 fill_literal
= fragP
->fr_literal
+ fragP
->fr_fix
;
1247 fill_size
= fragP
->fr_var
;
1248 know (fragP
->fr_offset
>= 0);
1250 for (count
= fragP
->fr_offset
; count
; count
--)
1252 append (&next_object_file_charP
, fill_literal
, (unsigned long) fill_size
);
1255 } /* for each code frag. */
1257 know ((next_object_file_charP
- the_object_file
) == (H_GET_HEADER_SIZE (&headers
) + H_GET_TEXT_SIZE (&headers
) + H_GET_DATA_SIZE (&headers
)));
1262 obj_emit_relocations (&next_object_file_charP
, text_fix_root
, (relax_addressT
) 0);
1263 know ((next_object_file_charP
- the_object_file
) == (H_GET_HEADER_SIZE (&headers
) + H_GET_TEXT_SIZE (&headers
) + H_GET_DATA_SIZE (&headers
) + H_GET_TEXT_RELOCATION_SIZE (&headers
)));
1265 /* Make addresses in data relocation directives relative to beginning of
1266 * first data fragment, not end of last text fragment: alignment of the
1267 * start of the data segment may place a gap between the segments.
1269 obj_emit_relocations (&next_object_file_charP
, data_fix_root
, data0_frchainP
->frch_root
->fr_address
);
1271 obj_emit_relocations (&next_object_file_charP
, data_fix_root
, text_last_frag
->fr_address
);
1272 #endif /* TC_I960 */
1274 know ((next_object_file_charP
- the_object_file
) == (H_GET_HEADER_SIZE (&headers
) + H_GET_TEXT_SIZE (&headers
) + H_GET_DATA_SIZE (&headers
) + H_GET_TEXT_RELOCATION_SIZE (&headers
) + H_GET_DATA_RELOCATION_SIZE (&headers
)));
1277 * Emit line number entries.
1279 OBJ_EMIT_LINENO (&next_object_file_charP
, lineno_rootP
, the_object_file
);
1280 know ((next_object_file_charP
- the_object_file
) == (H_GET_HEADER_SIZE (&headers
) + H_GET_TEXT_SIZE (&headers
) + H_GET_DATA_SIZE (&headers
) + H_GET_TEXT_RELOCATION_SIZE (&headers
) + H_GET_DATA_RELOCATION_SIZE (&headers
) + H_GET_LINENO_SIZE (&headers
)));
1285 obj_emit_symbols (&next_object_file_charP
, symbol_rootP
);
1286 know ((next_object_file_charP
- the_object_file
) == (H_GET_HEADER_SIZE (&headers
) + H_GET_TEXT_SIZE (&headers
) + H_GET_DATA_SIZE (&headers
) + H_GET_TEXT_RELOCATION_SIZE (&headers
) + H_GET_DATA_RELOCATION_SIZE (&headers
) + H_GET_LINENO_SIZE (&headers
) + H_GET_SYMBOL_TABLE_SIZE (&headers
)));
1292 if (string_byte_count
> 0)
1294 obj_emit_strings (&next_object_file_charP
);
1295 } /* only if we have a string table */
1298 bfd_seek (stdoutput
, 0, 0);
1299 bfd_write (the_object_file
, 1, object_file_size
, stdoutput
);
1302 /* Write the data to the file */
1303 output_file_append (the_object_file
, object_file_size
, out_file_name
);
1305 } /* non vms output */
1308 * Now do the VMS-dependent part of writing the object file
1310 VMS_write_object_file (H_GET_TEXT_SIZE (&headers
),
1311 H_GET_DATA_SIZE (&headers
),
1312 H_GET_BSS_SIZE (&headers
),
1313 text_frag_root
, data_frag_root
);
1315 #else /* BFD_ASSEMBLER */
1317 bfd_map_over_sections (stdoutput
, adjust_reloc_syms
, (char *)0);
1319 /* Set up symbol table, and write it out. */
1326 for (symp
= symbol_rootP
; symp
; symp
= symbol_next (symp
))
1330 if (! symp
->sy_resolved
)
1332 if (symp
->sy_value
.X_op
== O_constant
)
1334 /* This is the normal case; skip the call. */
1337 + symp
->sy_frag
->fr_address
));
1338 symp
->sy_resolved
= 1;
1341 resolve_symbol_value (symp
);
1344 /* So far, common symbols have been treated like undefined symbols.
1345 Put them in the common section now. */
1346 if (S_IS_DEFINED (symp
) == 0
1347 && S_GET_VALUE (symp
) != 0)
1348 S_SET_SEGMENT (symp
, &bfd_com_section
);
1350 printf ("symbol `%s'\n\t@%x: value=%d flags=%x seg=%s\n",
1351 S_GET_NAME (symp
), symp
,
1354 segment_name (symp
->bsym
->section
));
1357 #ifdef obj_frob_symbol
1358 obj_frob_symbol (symp
, punt
);
1360 #ifdef tc_frob_symbol
1361 if (! punt
|| symp
->sy_used_in_reloc
)
1362 tc_frob_symbol (symp
, punt
);
1365 /* If we don't want to keep this symbol, splice it out of
1366 the chain now. If EMIT_SECTION_SYMBOLS is 0, we never
1367 want section symbols. Otherwise, we skip local symbols
1368 and symbols that the frob_symbol macros told us to punt,
1369 but we keep such symbols if they are used in relocs. */
1370 if ((! EMIT_SECTION_SYMBOLS
1371 && (symp
->bsym
->flags
& BSF_SECTION_SYM
) != 0)
1372 || ((S_IS_LOCAL (symp
) || punt
)
1373 && ! symp
->sy_used_in_reloc
))
1375 symbolS
*prev
, *next
;
1377 prev
= symbol_previous (symp
);
1378 next
= symbol_next (symp
);
1380 verify_symbol_chain_2 (symp
);
1384 symbol_next (prev
) = next
;
1387 else if (symp
== symbol_rootP
)
1388 symbol_rootP
= next
;
1392 symbol_previous (next
) = prev
;
1394 symbol_lastP
= prev
;
1397 verify_symbol_chain_2 (prev
);
1399 verify_symbol_chain_2 (next
);
1404 /* Make sure we really got a value for the symbol. */
1405 if (! symp
->sy_resolved
)
1407 as_bad ("can't resolve value for symbol \"%s\"",
1409 symp
->sy_resolved
= 1;
1412 /* Set the value into the BFD symbol. Up til now the value
1413 has only been kept in the gas symbolS struct. */
1414 symp
->bsym
->value
= S_GET_VALUE (symp
);
1423 extern PTR bfd_alloc
PARAMS ((bfd
*, size_t));
1425 asympp
= (asymbol
**) bfd_alloc (stdoutput
,
1426 n
* sizeof (asymbol
*));
1427 symp
= symbol_rootP
;
1428 for (i
= 0; i
< n
; i
++, symp
= symbol_next (symp
))
1430 asympp
[i
] = symp
->bsym
;
1433 result
= bfd_set_symtab (stdoutput
, asympp
, n
);
1434 assert (result
== true);
1442 #ifdef obj_frob_file
1443 /* If obj_frob_file changes the symbol value at this point, it is
1444 responsible for moving the changed value into symp->bsym->value
1445 as well. Hopefully all symbol value changing can be done in
1446 {obj,tc}_frob_symbol. */
1450 /* Now that all the sizes are known, and contents correct, we can
1451 start writing the file. */
1452 bfd_map_over_sections (stdoutput
, write_relocs
, (char *) 0);
1454 bfd_map_over_sections (stdoutput
, write_contents
, (char *) 0);
1455 #endif /* BFD_ASSEMBLER */
1462 * Now we have a segment, not a crowd of sub-segments, we can make fr_address
1467 * After this, all frags in this segment have addresses that are correct
1468 * within the segment. Since segments live in different file addresses,
1469 * these frag addresses may not be the same as final object-file addresses.
1472 #ifndef md_relax_frag
1474 /* Subroutines of relax_segment. */
1480 for (; f1
; f1
= f1
->fr_next
)
1481 if (f1
->fr_next
== f2
)
1486 #endif /* ! defined (md_relax_frag) */
1488 /* Relax_align. Advance location counter to next address that has 'alignment'
1489 lowest order bits all 0s, return size of adjustment made. */
1490 static relax_addressT
1491 relax_align (address
, alignment
)
1492 register relax_addressT address
; /* Address now. */
1493 register int alignment
; /* Alignment (binary). */
1495 relax_addressT mask
;
1496 relax_addressT new_address
;
1498 mask
= ~((~0) << alignment
);
1499 new_address
= (address
+ mask
) & (~mask
);
1501 /* We must provide lots of padding, so the linker can discard it
1502 when needed. The linker will not add extra space, ever. */
1503 new_address
+= (1 << alignment
);
1504 return (new_address
- address
);
1508 relax_segment (segment_frag_root
, segment
)
1509 struct frag
*segment_frag_root
;
1512 register struct frag
*fragP
;
1513 register relax_addressT address
;
1514 #if !defined (MANY_SEGMENTS) && !defined (BFD_ASSEMBLER)
1515 know (segment
== SEG_DATA
|| segment
== SEG_TEXT
|| segment
== SEG_BSS
);
1517 /* In case md_estimate_size_before_relax() wants to make fixSs. */
1518 subseg_change (segment
, 0);
1520 /* For each frag in segment: count and store (a 1st guess of)
1523 for (fragP
= segment_frag_root
; fragP
; fragP
= fragP
->fr_next
)
1525 fragP
->fr_address
= address
;
1526 address
+= fragP
->fr_fix
;
1528 switch (fragP
->fr_type
)
1531 address
+= fragP
->fr_offset
* fragP
->fr_var
;
1536 int offset
= relax_align (address
, (int) fragP
->fr_offset
);
1537 if (offset
% fragP
->fr_var
!= 0)
1539 as_bad ("alignment padding (%d bytes) not a multiple of %ld",
1540 offset
, (long) fragP
->fr_var
);
1541 offset
-= (offset
% fragP
->fr_var
);
1548 /* Assume .org is nugatory. It will grow with 1st relax. */
1551 case rs_machine_dependent
:
1552 address
+= md_estimate_size_before_relax (fragP
, segment
);
1555 #ifndef WORKING_DOT_WORD
1556 /* Broken words don't concern us yet */
1557 case rs_broken_word
:
1562 BAD_CASE (fragP
->fr_type
);
1564 } /* switch(fr_type) */
1565 } /* for each frag in the segment */
1569 long stretch
; /* May be any size, 0 or negative. */
1570 /* Cumulative number of addresses we have */
1571 /* relaxed this pass. */
1572 /* We may have relaxed more than one address. */
1573 long stretched
; /* Have we stretched on this pass? */
1574 /* This is 'cuz stretch may be zero, when, in fact some piece of code
1575 grew, and another shrank. If a branch instruction doesn't fit anymore,
1576 we could be scrod. */
1580 stretch
= stretched
= 0;
1581 for (fragP
= segment_frag_root
; fragP
; fragP
= fragP
->fr_next
)
1584 unsigned long was_address
;
1590 was_address
= fragP
->fr_address
;
1591 address
= fragP
->fr_address
+= stretch
;
1592 symbolP
= fragP
->fr_symbol
;
1593 offset
= fragP
->fr_offset
;
1595 switch (fragP
->fr_type
)
1597 case rs_fill
: /* .fill never relaxes. */
1601 #ifndef WORKING_DOT_WORD
1602 /* JF: This is RMS's idea. I do *NOT* want to be blamed
1603 for it I do not want to write it. I do not want to have
1604 anything to do with it. This is not the proper way to
1605 implement this misfeature. */
1606 case rs_broken_word
:
1608 struct broken_word
*lie
;
1609 struct broken_word
*untruth
;
1611 /* Yes this is ugly (storing the broken_word pointer
1612 in the symbol slot). Still, this whole chunk of
1613 code is ugly, and I don't feel like doing anything
1614 about it. Think of it as stubbornness in action. */
1616 for (lie
= (struct broken_word
*) (fragP
->fr_symbol
);
1617 lie
&& lie
->dispfrag
== fragP
;
1618 lie
= lie
->next_broken_word
)
1624 offset
= (lie
->add
->sy_frag
->fr_address
1625 + S_GET_VALUE (lie
->add
)
1627 - (lie
->sub
->sy_frag
->fr_address
1628 + S_GET_VALUE (lie
->sub
)));
1629 if (offset
<= -32768 || offset
>= 32767)
1634 sprint_value (buf
, (addressT
) lie
->addnum
);
1635 as_warn (".word %s-%s+%s didn't fit",
1636 S_GET_NAME (lie
->add
),
1637 S_GET_NAME (lie
->sub
),
1641 if (fragP
->fr_subtype
== 0)
1643 fragP
->fr_subtype
++;
1644 growth
+= md_short_jump_size
;
1646 for (untruth
= lie
->next_broken_word
;
1647 untruth
&& untruth
->dispfrag
== lie
->dispfrag
;
1648 untruth
= untruth
->next_broken_word
)
1649 if ((untruth
->add
->sy_frag
== lie
->add
->sy_frag
)
1650 && S_GET_VALUE (untruth
->add
) == S_GET_VALUE (lie
->add
))
1653 untruth
->use_jump
= lie
;
1655 growth
+= md_long_jump_size
;
1660 } /* case rs_broken_word */
1663 growth
= (relax_align ((relax_addressT
) (address
1666 - relax_align ((relax_addressT
) (was_address
1676 #if !defined (MANY_SEGMENTS) && !defined (BFD_ASSEMBLER)
1677 know ((S_GET_SEGMENT (symbolP
) == SEG_ABSOLUTE
)
1678 || (S_GET_SEGMENT (symbolP
) == SEG_DATA
)
1679 || (S_GET_SEGMENT (symbolP
) == SEG_TEXT
)
1680 || S_GET_SEGMENT (symbolP
) == SEG_BSS
);
1681 know (symbolP
->sy_frag
);
1682 know (!(S_GET_SEGMENT (symbolP
) == SEG_ABSOLUTE
)
1683 || (symbolP
->sy_frag
== &zero_address_frag
));
1685 target
+= S_GET_VALUE (symbolP
)
1686 + symbolP
->sy_frag
->fr_address
;
1687 } /* if we have a symbol */
1689 know (fragP
->fr_next
);
1690 after
= fragP
->fr_next
->fr_address
;
1691 growth
= ((target
- after
) > 0) ? (target
- after
) : 0;
1692 /* Growth may be negative, but variable part of frag
1693 cannot have fewer than 0 chars. That is, we can't
1696 growth
-= stretch
; /* This is an absolute growth factor */
1699 case rs_machine_dependent
:
1700 #ifdef md_relax_frag
1701 growth
= md_relax_frag (fragP
, stretch
);
1703 /* The default way to relax a frag is to look through
1706 const relax_typeS
*this_type
;
1707 const relax_typeS
*start_type
;
1708 relax_substateT next_state
;
1709 relax_substateT this_state
;
1712 this_state
= fragP
->fr_subtype
;
1713 start_type
= this_type
= md_relax_table
+ this_state
;
1718 #ifndef DIFF_EXPR_OK
1719 #if !defined (MANY_SEGMENTS) && !defined (BFD_ASSEMBLER)
1720 know ((S_GET_SEGMENT (symbolP
) == SEG_ABSOLUTE
)
1721 || (S_GET_SEGMENT (symbolP
) == SEG_DATA
)
1722 || (S_GET_SEGMENT (symbolP
) == SEG_BSS
)
1723 || (S_GET_SEGMENT (symbolP
) == SEG_TEXT
));
1725 know (symbolP
->sy_frag
);
1727 know (!(S_GET_SEGMENT (symbolP
) == absolute_section
)
1728 || symbolP
->sy_frag
== &zero_address_frag
);
1730 S_GET_VALUE (symbolP
)
1731 + symbolP
->sy_frag
->fr_address
;
1733 /* If frag has yet to be reached on this pass,
1734 assume it will move by STRETCH just as we did.
1735 If this is not so, it will be because some frag
1736 between grows, and that will force another pass.
1738 Beware zero-length frags.
1740 There should be a faster way to do this. */
1742 if (symbolP
->sy_frag
->fr_address
>= was_address
1743 && is_dnrange (fragP
, symbolP
->sy_frag
))
1749 aim
= target
- address
- fragP
->fr_fix
;
1750 /* The displacement is affected by the instruction size
1751 for the 32k architecture. I think we ought to be able
1752 to add fragP->fr_pcrel_adjust in all cases (it should be
1753 zero if not used), but just in case it breaks something
1754 else we'll put this inside #ifdef NS32K ... #endif */
1756 if (fragP
->fr_pcrel_adjust
)
1759 aim
+= fragP
->fr_pcrel_adjust
;
1763 /* Look backwards. */
1764 for (next_state
= this_type
->rlx_more
; next_state
;)
1765 if (aim
>= this_type
->rlx_backward
)
1769 /* Grow to next state. */
1770 this_state
= next_state
;
1771 this_type
= md_relax_table
+ this_state
;
1772 next_state
= this_type
->rlx_more
;
1777 #ifdef M68K_AIM_KLUDGE
1778 M68K_AIM_KLUDGE (aim
, this_state
, this_type
);
1780 /* Look forwards. */
1781 for (next_state
= this_type
->rlx_more
; next_state
;)
1782 if (aim
<= this_type
->rlx_forward
)
1786 /* Grow to next state. */
1787 this_state
= next_state
;
1788 this_type
= md_relax_table
+ this_state
;
1789 next_state
= this_type
->rlx_more
;
1793 growth
= this_type
->rlx_length
- start_type
->rlx_length
;
1795 fragP
->fr_subtype
= this_state
;
1801 BAD_CASE (fragP
->fr_type
);
1809 } /* For each frag in the segment. */
1811 while (stretched
); /* Until nothing further to relax. */
1815 * We now have valid fr_address'es for each frag.
1819 * All fr_address's are correct, relative to their own segment.
1820 * We have made all the fixS we will ever make.
1822 } /* relax_segment() */
1824 #if defined (BFD_ASSEMBLER) || !defined (BFD)
1828 Go through all the fixS's in a segment and see which ones can be
1829 handled now. (These consist of fixS where we have since discovered
1830 the value of a symbol, or the address of the frag involved.)
1831 For each one, call md_apply_fix to put the fix into the frag data.
1833 Result is a count of how many relocation structs will be needed to
1834 handle the remaining fixS's that we couldn't completely handle here.
1835 These will be output later by emit_relocations(). */
1838 fixup_segment (fixP
, this_segment_type
)
1839 register fixS
*fixP
;
1840 segT this_segment_type
; /* N_TYPE bits for segment. */
1842 long seg_reloc_count
= 0;
1843 symbolS
*add_symbolP
;
1844 symbolS
*sub_symbolP
;
1851 segT add_symbol_segment
= absolute_section
;
1853 /* If the linker is doing the relaxing, we must not do any fixups.
1855 Well, strictly speaking that's not true -- we could do any that are
1856 PC-relative and don't cross regions that could change size. And for the
1857 i960 (the only machine for which we've got a relaxing linker right now),
1858 we might be able to turn callx/callj into bal anyways in cases where we
1859 know the maximum displacement. */
1862 for (; fixP
; fixP
= fixP
->fx_next
)
1864 TC_ADJUST_RELOC_COUNT (fixP
, seg_reloc_count
);
1865 return seg_reloc_count
;
1868 for (; fixP
; fixP
= fixP
->fx_next
)
1870 fragP
= fixP
->fx_frag
;
1872 where
= fixP
->fx_where
;
1873 place
= fragP
->fr_literal
+ where
;
1874 size
= fixP
->fx_size
;
1875 add_symbolP
= fixP
->fx_addsy
;
1876 #ifdef TC_VALIDATE_FIX
1877 TC_VALIDATE_FIX (fixP
, this_segment_type
, skip
);
1879 sub_symbolP
= fixP
->fx_subsy
;
1880 add_number
= fixP
->fx_offset
;
1881 pcrel
= fixP
->fx_pcrel
;
1884 add_symbol_segment
= S_GET_SEGMENT (add_symbolP
);
1891 if (S_GET_SEGMENT (sub_symbolP
) == absolute_section
)
1892 add_number
-= S_GET_VALUE (sub_symbolP
);
1894 && S_GET_SEGMENT (sub_symbolP
) == this_segment_type
)
1896 /* Should try converting to a constant. */
1901 as_bad ("Negative of non-absolute symbol %s",
1902 S_GET_NAME (sub_symbolP
));
1904 else if ((S_GET_SEGMENT (sub_symbolP
) == add_symbol_segment
)
1905 && (SEG_NORMAL (add_symbol_segment
)
1906 || (add_symbol_segment
== absolute_section
)))
1908 /* Difference of 2 symbols from same segment.
1909 Can't make difference of 2 undefineds: 'value' means
1910 something different for N_UNDF. */
1912 /* Makes no sense to use the difference of 2 arbitrary symbols
1913 as the target of a call instruction. */
1915 as_bad ("callj to difference of 2 symbols");
1916 #endif /* TC_I960 */
1917 add_number
+= S_GET_VALUE (add_symbolP
) -
1918 S_GET_VALUE (sub_symbolP
);
1922 /* Let the target machine make the final determination
1923 as to whether or not a relocation will be needed to
1924 handle this fixup. */
1925 if (!TC_FORCE_RELOCATION (fixP
))
1927 fixP
->fx_addsy
= NULL
;
1932 /* Different segments in subtraction. */
1933 know (!(S_IS_EXTERNAL (sub_symbolP
)
1934 && (S_GET_SEGMENT (sub_symbolP
) == absolute_section
)));
1936 if ((S_GET_SEGMENT (sub_symbolP
) == absolute_section
))
1937 add_number
-= S_GET_VALUE (sub_symbolP
);
1940 else if (S_GET_SEGMENT (sub_symbolP
) == this_segment_type
1941 #if 0 /* Do this even if it's already described as pc-relative. For example,
1942 on the m68k, an operand of "pc@(foo-.-2)" should address "foo" in a
1943 pc-relative mode. */
1948 /* Make it pc-relative. */
1949 add_number
+= (md_pcrel_from (fixP
)
1950 - S_GET_VALUE (sub_symbolP
));
1957 #ifdef BFD_ASSEMBLER
1958 else if (fixP
->fx_r_type
== BFD_RELOC_GPREL32
1959 || fixP
->fx_r_type
== BFD_RELOC_GPREL16
)
1961 /* Leave it alone. */
1967 sprint_value (buf
, fragP
->fr_address
+ where
);
1968 as_bad ("Can't emit reloc {- %s-seg symbol \"%s\"} @ file address %s.",
1969 segment_name (S_GET_SEGMENT (sub_symbolP
)),
1970 S_GET_NAME (sub_symbolP
), buf
);
1977 if (add_symbol_segment
== this_segment_type
&& pcrel
)
1980 * This fixup was made when the symbol's segment was
1981 * SEG_UNKNOWN, but it is now in the local segment.
1982 * So we know how to do the address without relocation.
1985 /* reloc_callj() may replace a 'call' with a 'calls' or a
1986 'bal', in which cases it modifies *fixP as appropriate.
1987 In the case of a 'calls', no further work is required,
1988 and *fixP has been set up to make the rest of the code
1991 #endif /* TC_I960 */
1993 add_number
+= S_GET_VALUE (add_symbolP
);
1994 add_number
-= md_pcrel_from (fixP
);
1995 pcrel
= 0; /* Lie. Don't want further pcrel processing. */
1997 /* Let the target machine make the final determination
1998 as to whether or not a relocation will be needed to
1999 handle this fixup. */
2000 if (!TC_FORCE_RELOCATION (fixP
))
2003 fixP
->fx_addsy
= NULL
;
2008 if (add_symbol_segment
== absolute_section
)
2011 /* See comment about reloc_callj() above. */
2013 #endif /* TC_I960 */
2014 add_number
+= S_GET_VALUE (add_symbolP
);
2016 /* Let the target machine make the final determination
2017 as to whether or not a relocation will be needed to
2018 handle this fixup. */
2019 if (!TC_FORCE_RELOCATION (fixP
))
2021 fixP
->fx_addsy
= NULL
;
2025 else if (add_symbol_segment
== undefined_section
2026 #ifdef BFD_ASSEMBLER
2027 || bfd_is_com_section (add_symbol_segment
)
2032 if ((int) fixP
->fx_bit_fixP
== 13)
2034 /* This is a COBR instruction. They have only a
2035 * 13-bit displacement and are only to be used
2036 * for local branches: flag as error, don't generate
2039 as_bad ("can't use COBR format with external label");
2040 fixP
->fx_addsy
= NULL
;
2044 #endif /* TC_I960 */
2048 if (S_IS_COMMON (add_symbolP
))
2049 add_number
+= S_GET_VALUE (add_symbolP
);
2050 #endif /* TE_I386AIX */
2051 #endif /* OBJ_COFF */
2057 add_number
+= S_GET_VALUE (add_symbolP
);
2064 add_number
-= md_pcrel_from (fixP
);
2065 if (add_symbolP
== 0)
2067 fixP
->fx_addsy
= &abs_symbol
;
2072 if (!fixP
->fx_bit_fixP
&& size
> 0)
2075 /* set all bits to one */
2077 /* Technically, combining these produces an undefined result
2078 if size is sizeof (valueT), though I think these two
2079 half-way operations should both be defined. And the
2080 compiler should be able to combine them if it's valid on
2081 the host architecture. */
2084 if ((add_number
& mask
) != 0
2085 && (add_number
& mask
) != mask
)
2087 char buf
[50], buf2
[50];
2088 sprint_value (buf
, fragP
->fr_address
+ where
);
2089 if (add_number
> 1000)
2090 sprint_value (buf2
, add_number
);
2092 sprintf (buf2
, "%ld", (long) add_number
);
2093 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
2094 "Value of %s too large for field of %d bytes at %s",
2096 } /* generic error checking */
2097 #ifdef WARN_SIGNED_OVERFLOW_WORD
2098 /* Warn if a .word value is too large when treated as a signed
2099 number. We already know it is not too negative. This is to
2100 catch over-large switches generated by gcc on the 68k. */
2103 && add_number
> 0x7fff)
2104 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
2105 "Signed .word overflow; switch may be too large; %ld at 0x%lx",
2107 (unsigned long) (fragP
->fr_address
+ where
));
2109 } /* not a bit fix */
2113 #ifdef BFD_ASSEMBLER
2114 md_apply_fix (fixP
, &add_number
);
2116 md_apply_fix (fixP
, add_number
);
2119 #ifndef TC_HANDLES_FX_DONE
2120 /* If the tc-* files haven't been converted, assume it's handling
2121 it the old way, where a null fx_addsy means that the fix has
2122 been applied completely, and no further work is needed. */
2123 if (fixP
->fx_addsy
== 0 && fixP
->fx_pcrel
== 0)
2127 #ifdef TC_VALIDATE_FIX
2131 } /* For each fixS in this segment. */
2133 TC_ADJUST_RELOC_COUNT (fixP
, seg_reloc_count
);
2134 return seg_reloc_count
;
2137 #endif /* defined (BFD_ASSEMBLER) || !defined (BFD) */
2140 number_to_chars_bigendian (buf
, val
, n
)
2145 if (n
> sizeof (val
)|| n
<= 0)
2149 buf
[n
] = val
& 0xff;
2155 number_to_chars_littleendian (buf
, val
, n
)
2160 if (n
> sizeof (val
) || n
<= 0)
2164 *buf
++ = val
& 0xff;
2169 /* end of write.c */